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+publicationDate,title,abstract,id
+2019-11-27,How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator,"The concept of the entanglement between spin and orbital degrees of freedom
+plays a crucial role in understanding various phases and exotic ground states
+in a broad class of materials, including orbitally ordered materials and spin
+liquids. We investigate how the spin-orbital entanglement in a Mott insulator
+depends on the value of the spin-orbit coupling of the relativistic origin. To
+this end, we numerically diagonalize a 1D spin-orbital model with the
+'Kugel-Khomskii' exchange interactions between spins and orbitals on different
+sites supplemented by the on-site spin-orbit coupling. In the regime of small
+spin-orbit coupling w.r.t. the spin-orbital exchange, the ground state to a
+large extent resembles the one obtained in the limit of vanishing spin-orbit
+coupling. On the other hand, for large spin-orbit coupling the ground state
+can, depending on the model parameters, either still show negligible
+spin-orbital entanglement, or can evolve to a highly spin-orbitally entangled
+phase with completely distinct properties that are described by an effective
+XXZ model. The presented results suggest that: (i) the spin-orbital
+entanglement may be induced by large on-site spin-orbit coupling, as found in
+the 5d transition metal oxides, such as the iridates; (ii) for Mott insulators
+with weak spin-orbit coupling of Ising-type, such as e.g. the alkali
+hyperoxides, the effects of the spin-orbit coupling on the ground state can, in
+the first order of perturbation theory, be neglected.",1911.12180v2
+2016-09-11,Spin-Orbit Coupling Induced Spin Squeezing in Three-Component Bose Gases,"We observe spin squeezing in three-component Bose gases where all three
+hyperfine states are coupled by synthetic spin-orbit coupling. This phenomenon
+is a direct consequence of spin-orbit coupling, as can be seen clearly from an
+effective spin Hamiltonian. By solving this effective model analytically with
+the aid of a Holstein-Primakoff transformation for spin-1 system in the low
+excitation limit, we conclude that the spin-nematic squeezing, a novel category
+of spin squeezing existing exclusively in large spin systems, is enhanced with
+increasing spin-orbit intensity and effective Zeeman field, which correspond to
+Rabi frequency and two-photon detuning within the Raman scheme for synthetic
+spin-orbit coupling, respectively. These trends of dependence are in clear
+contrast to spin-orbit coupling induced spin squeezing in spin-1/2 systems. We
+also analyze the effects of harmonic trap and interaction with realistic
+experimental parameters numerically, and find that a strong harmonic trap
+favors spin-nematic squeezing. We further show spin-nematic squeezing can be
+interpreted as two-mode entanglement or two-spin squeezing at low excitation.
+Our findings can be observed in ^{87}Rb gases with existing techniques of
+synthetic spin-orbit coupling and spin-selectively imaging.",1609.03141v1
+2020-09-24,Evolution of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling,"Several realistic spin-orbital models for transition metal oxides go beyond
+the classical expectations and could be understood only by employing the
+quantum entanglement. Experiments on these materials confirm that spin-orbital
+entanglement has measurable consequences. Here, we capture the essential
+features of spin-orbital entanglement in complex quantum matter utilizing 1D
+spin-orbital model which accommodates SU(2)xSU(2) symmetric Kugel-Khomskii
+superexchange as well as the Ising on-site spin-orbit coupling. Building on the
+results obtained for full and effective models in the regime of strong
+spin-orbit coupling, we address the question whether the entanglement found on
+superexchange bonds always increases when the Ising spin-orbit coupling is
+added. We show that (i) quantum entanglement is amplified by strong spin-orbit
+coupling and, surprisingly, (ii) almost classical disentangled states are
+possible. We complete the latter case by analyzing how the entanglement
+existing for intermediate values of spin-orbit coupling can disappear for
+higher values of this coupling.",2009.11773v1
+2011-08-31,Curvature-induced spin-orbit coupling and spin relaxation in a chemically clean single-layer graphene,"The study of spin-related phenomena in materials requires knowledge on the
+precise form of effective spin-orbit coupling of conducting carriers in the
+solid-states systems. We demonstrate theoretically that curvature induced by
+corrugations or periodic ripples in single-layer graphenes generates two types
+of effective spin-orbit coupling. In addition to the spin-orbit coupling
+reported previously that couples with sublattice pseudospin and corresponds to
+the Rashba-type spin-orbit coupling in a corrugated single-layer graphene,
+there is an additional spin-orbit coupling that does not couple with the
+pseudospin, which can not be obtained from the extension of the
+curvature-induced spin-orbit coupling of carbon nanotubes. Via numerical
+calculation we show that both types of the curvature-induced spin-orbit
+coupling make the same order of contribution to spin relaxation in chemically
+clean single-layer graphene with nanoscale corrugation. The spin relaxation
+dependence on the corrugation roughness is also studied.",1108.6128v3
+2007-01-31,Coupled spin-charge drift-diffusion approach for a two-dimensional electron gas with Rashba spin-orbit coupling,"Based on kinetic equations for the density matrix, drift-diffusion equations
+are derived for a two-dimensional electron gas with Rashba spin-orbit coupling.
+Universal results are obtained for the weak coupling case. Most interesting is
+the observation that with increasing spin-orbit coupling strengths there is a
+sharp transition between spin diffusion and ballistic spin transport. For
+strong spin-orbit coupling, when the elastic scattering time is much larger
+than the spin relaxation time, undamped spin-coherent waves are identified. The
+existence of these long-lived spin-coherent states is confirmed by exact
+analytical results obtained from microscopic kinetic equations valid in the
+ballistic regime.",0701782v1
+2015-05-28,Intrinsic spin Hall effect in systems with striped spin-orbit coupling,"The Rashba spin-orbit coupling arising from structure inversion asymmetry
+couples spin and momentum degrees of freedom providing a suitable (and very
+intensively investigated) environment for spintronic effects and devices. Here
+we show that in the presence of strong disorder, non-homogeneity in the
+spin-orbit coupling gives rise to a finite spin Hall conductivity in contrast
+with the corresponding case of a homogeneous linear spin-orbit coupling. In
+particular, we examine the inhomogeneity arising from a striped structure for a
+two-dimensional electron gas, affecting both density and Rashba spin-orbit
+coupling. We suggest that this situation can be realized at oxide interfaces
+with periodic top gating.",1505.07667v1
+2018-05-25,Generation of Spin Current from Lattice Distortion Dynamics: Spin-Orbit Routes,"Generation of spin current from lattice distortion dynamics in metals is
+studied with special attention on the effect of spin-orbit coupling. Treating
+the lattice distortion by local coordinate transformation, we calculate spin
+current and spin accumulation with the linear response theory. It is found that
+there are two routes to the spin-current generation, one via the spin Hall
+effect and the other via the spin accumulation. The present effect due to
+spin-orbit coupling can be comparable to, or even larger than, the one based on
+the spin-vorticity coupling in systems with strong spin-orbit coupling.",1805.10328v2
+2009-10-16,Current-induced spin polarization for a general two-dimensional electron system,"In this paper, current-induced spin polarization for two-dimensional electron
+gas with a general spin-orbit interaction is investigated. For isotropic energy
+spectrum, the in-plane current-induced spin polarization is found to be
+dependent on the electron density for non-linear spin-orbit interaction and
+increases with the increment of sheet density, in contrast to the case for $\bm
+k$-linear spin-orbit coupling model. The numerical evaluation is performed for
+InAs/InSb heterojunction with spin-orbit coupling of both linear and cubic
+spin-orbit coupling types. For $\delta$-type short-range electron-impurity
+scattering, it is found that the current-induced spin polarization increases
+with increasing the density when cubic spin-orbit couplings are considered.
+However, for remote disorders, a rapid enhancement of current-induced spin
+polarization is always observed at high electron density, even in the case
+without cubic spin-orbit coupling. This result demonstrates the
+collision-related feature of current-induced spin polarization. The effects of
+different high order spin-orbit couplings on spin polarization can be
+comparable.",0910.3050v1
+2018-10-08,Zeeman spin-orbit coupling in antiferromagnetic conductors,"This article is a brief review of Zeeman spin-orbit coupling, arising in a
+low-carrier commensurate N\'eel antiferromagnet subject to magnetic field. The
+field tends to lift the degeneracy of the electron spectrum. However, a hidden
+symmetry protects double degeneracy of Bloch eigenstates at special momenta in
+the Brillouin zone. The effective transverse $g$-factor vanishes at such
+points, thus acquiring a substantial momentum dependence, which turns a
+textbook Zeeman term into a spin-orbit coupling. After describing the symmetry
+underpinnings of the Zeeman spin-orbit coupling, I compare it with its
+intrinsic counterparts such as Rashba coupling, and then show how Zeeman
+spin-orbit coupling may survive in the presence of intrinsic spin-orbit
+coupling. Finally, I outline some of the likely experimental manifestations of
+Zeeman spin-orbit coupling, and compare it with similar phenomena in other
+settings such as semiconducting quantum wells.",1810.03720v1
+2021-01-27,Spin-memory loss induced by bulk spin-orbit coupling at ferromagnet/heavy-metal interfaces,"A spin current through a ferromagnet/heavy-metal interface may shrink due to
+the spin-flip at the interface, resulting in the spin-memory loss. Here we
+propose a mechanism of the spin-memory loss. In contrast to other mechanisms
+based on interfacial spin-orbit coupling, our mechanism is based on the bulk
+spin-orbit coupling in a heavy-metal. We demonstrate that the bulk spin-orbit
+coupling induces the entanglement between the spin and orbital degrees of
+freedom and this spin-orbital entanglement can give rise to sizable spin-flip
+at the interface even when the interfacial spin-orbit coupling is weak. Our
+mechanism emphasizes crucial roles of the atomic orbital degree of freedom and
+induces the strong spin-memory loss near band crossing points between bands of
+different orbital characters.",2101.11438v1
+2023-10-07,"Orbital diffusion, polarization and swapping in centrosymmetric metals","We propose a general theory of charge, spin and orbital diffusion based on
+Keldysh formalism. Our findings indicate that the diffusivity of orbital
+angular momentum in metals is much lower than that of spin or charge due to the
+strong orbital intermixing in crystals. Furthermore, our theory introduces the
+concept of spin-orbit polarization by which a pure orbital (spin) current
+induces a longitudinal spin (orbital) current, a process as efficient as spin
+polarization in ferromagnets. Finally, we find that orbital currents undergo
+momentum swapping, even in the absence of spin-orbit coupling. This theory
+establishes several key parameters for orbital transport of direct importance
+to experiments.",2310.04763v1
+2018-04-28,Spin-1 Bosons in the Presence of Spin-orbit Coupling,"In this paper, I'm going to talk about the theoretical and experimental
+progress in studying spin-orbit coupled spin-1 bosons. Realization of
+spin-orbit coupled quantum gases opens a new avenue in cold atom physics. In
+particular, the interplay between spin-orbit coupling and inter-atomic
+interaction leads to many intriguing phenomena. Moreover, the non-zero momentum
+of ground states can be controlled by external fields, which allows for good
+quantum control.",1805.00001v1
+2021-03-10,Magnetic phases for two $t_{2g}$ holes with spin-orbit coupling and crystal field,"We investigate two holes in the the $t_{2g}$ levels of a square-lattice Mott
+insulator with strong spin-orbit coupling. Exact diagonalization of a
+spin-orbital model valid at strong onsite interactions, but arbitrary
+spin-orbit coupling and crystal field is complemented by an effective triplon
+model (valid for strong spin-orbit coupling) and by a semiclassical variant of
+the model. We provide the magnetic phase diagram depending on crystal field and
+spin-orbit coupling, which largely agrees for the semiclassical and quantum
+models, as well as excitation spectra characterizing the various phases.",2103.06033v1
+2007-10-28,Some symmetry properties of spin currents and spin polarizations in multi-terminal mesoscopic spin-orbit coupled systems,"We study theoretically some symmetry properties of spin currents and spin
+polarizations in multi-terminal mesoscopic spin-orbit coupled systems. Based on
+a scattering wave function approach, we show rigorously that in the equilibrium
+state no finite spin polarizations can exist in a multi-terminal mesoscopic
+spin-orbit coupled system (both in the leads and in the spin-orbit coupled
+region) and also no finite equilibrium terminal spin currents can exist. By use
+of a typical two-terminal mesoscopic spin-orbit coupled system as the example,
+we show explicitly that the nonequilibrium terminal spin currents in a
+multi-terminal mesoscopic spin-orbit coupled system are non-conservative in
+general. This non-conservation of terminal spin currents is not caused by the
+use of an improper definition of spin current but is intrinsic to
+spin-dependent transports in mesoscopic spin-orbit coupled systems. We also
+show that the nonequilibrium lateral edge spin accumulation induced by a
+longitudinal charge current in a thin strip of \textit{finite} length of a
+two-dimensional electronic system with intrinsic spin-orbit coupling may be
+non-antisymmetric in general, which implies that some cautions may need to be
+taken when attributing the occurrence of nonequilibrium lateral edge spin
+accumulation induced by a longitudinal charge current in such a system to an
+intrinsic spin Hall effect.",0710.5316v1
+2023-11-18,Thermal Spin Orbit Torque with Dresselhaus Spin Orbit Coupling,"Based on the spinor Boltzmann equation, we obtain a temperature dependent
+thermal spin-orbit torque in terms of the local equilibrium distribution
+function in a two dimensional ferromagnet with Dresselhaus spin-orbit coupling.
+We also derive the continuity equation of spin accumulation and spin current,
+the spin diffusion equation in Dresselhaus ferromagnet, which contains the
+thermal spin orbit torque under local equilibrium assumption. This temperature
+dependent thermal spin-orbit torque originates from the temperature gradient
+applied to the system. it is also sensitive to temperature due to the local
+equilibrium distribution function therein. In the spin diffusion equation, we
+can single out the usual spin-orbit torque as well as the spin transfer torque,
+which is conceded to our previous results. Finally, we illustrate them by an
+example of spin-polarized transport through a ferromagnet with Dresselhaus
+spin-orbit coupling driven by temperature gradient, those torques including
+thermal spin-orbit torque are demonstrated numerically.",2311.14719v1
+2017-12-15,Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures,"Large spin-orbital proximity effects have been predicted in graphene
+interfaced with a transition metal dichalcogenide layer. Whereas clear evidence
+for an enhanced spin-orbit coupling has been found at large carrier densities,
+the type of spin-orbit coupling and its relaxation mechanism remained unknown.
+We show for the first time an increased spin-orbit coupling close to the charge
+neutrality point in graphene, where topological states are expected to appear.
+Single layer graphene encapsulated between the transition metal dichalcogenide
+WSe$_2$ and hBN is found to exhibit exceptional quality with mobilities as high
+as 100000 cm^2/V/s. At the same time clear weak anti-localization indicates
+strong spin-orbit coupling and a large spin relaxation anisotropy due to the
+presence of a dominating symmetric spin-orbit coupling is found. Doping
+dependent measurements show that the spin relaxation of the in-plane spins is
+largely dominated by a valley-Zeeman spin-orbit coupling and that the intrinsic
+spin-orbit coupling plays a minor role in spin relaxation. The strong
+spin-valley coupling opens new possibilities in exploring spin and valley
+degree of freedom in graphene with the realization of new concepts in spin
+manipulation.",1712.05678v2
+2007-01-05,Deformation of SU(4) singlet spin-orbital state due to Hund's rule coupling,"We investigate the ground-state property and the excitation gap of a
+one-dimensional spin-orbital model with isotropic spin and anisotropic orbital
+exchange interactions, which represents the strong-coupling limit of a
+two-orbital Hubbard model including the Hund's rule coupling ($J$) at quarter
+filling, by using a density-matrix renormalization group method. At J=0, spin
+and orbital correlations coincide with each other with a peak at $q=\pi/2$,
+corresponding to the SU(4) singlet state. On the other hand, spin and orbital
+states change in a different way due to the Hund's rule coupling. With
+increasing $J$, the peak position of orbital correlation changes to $q=\pi$,
+while that of spin correlation remains at $q=\pi/2$. In addition, orbital dimer
+correlation becomes robust in comparison with spin dimer correlation,
+suggesting that quantum orbital fluctuation is enhanced by the Hund's rule
+coupling. Accordingly, a relatively large orbital gap opens in comparison with
+a spin gap, and the system is described by an effective spin system on the
+background of the orbital dimer state.",0701092v1
+2010-04-08,Coupling of bonding and antibonding electron orbitals in double quantum dots by spin-orbit interaction,"We perform a systematic exact diagonalization study of spin-orbit coupling
+effects for stationary few-electron states confined in quasi two-dimensional
+double quantum dots. We describe the spin-orbit-interaction induced coupling
+between bonding and antibonding orbitals and its consequences for
+magneto-optical absorption spectrum. The spin-orbit coupling for odd electron
+numbers (one, three) %only weakly perturbs the ground-state wave functions.
+%Nevertheless, %the spin-orbit interaction opens avoided crossings between low
+energy excited levels of opposite spin orientation and opposite spatial parity.
+For two-electrons the spin-orbit coupling allows for low-energy optical
+transitions that are otherwise forbidden by spin and parity selection rules. We
+demonstrate that the energies of optical transitions can be significantly
+increased by an in-plane electric field but only for odd electron numbers.
+Occupation of single-electron orbitals and effects of spin-orbit coupling on
+electron distribution between the dots are also discussed.",1004.1250v1
+2021-11-22,Particle and spin transports of spin-orbit coupled Fermi gas through a Quantum Point Contact,"The particle and spin transport through a quantum point contact between two
+Fermi gases with Raman-induced spin-orbit coupling are investigated. We show
+that the particle and spin conductances both demonstrate the structure of
+plateau due to the mesoscopic scale of the quantum point contact. Compared with
+the normal Fermi gases the particle conductance can be significantly enhanced
+by the spin-orbit coupling effect. Furthermore, the conversion of the particle
+and spin currents can take place in the spin-orbit coupled system, and we find
+that it is controlled by the parameter of two-photon detuning. When the
+parameter of two-photon detuning vanishes the particle and spin currents
+decouple.",2111.11054v1
+2017-01-25,Direct Mapping of Spin and Orbital Entangled Wavefunction under Interband Spin-Orbit coupling of Rashba Spin-Split Surface States,"We use spin- and angle-resolved photoemission spectroscopy (SARPES) combined
+with polarization-variable laser and investigate the spin-orbit coupling effect
+under interband hybridization of Rashba spin-split states for the surface
+alloys Bi/Ag(111) and Bi/Cu(111). In addition to the conventional band mapping
+of photoemission for Rashba spin-splitting, the different orbital and spin
+parts of the surface wavefucntion are directly imaged into energy-momentum
+space. It is unambiguously revealed that the interband spin-orbit coupling
+modifies the spin and orbital character of the Rashba surface states leading to
+the enriched spin-orbital entanglement and the pronounced momentum dependence
+of the spin-polarization. The hybridization thus strongly deviates the spin and
+orbital characters from the standard Rashba model. The complex spin texture
+under interband spin-orbit hybridyzation proposed by first-principles
+calculation is experimentally unraveled by SARPES with a combination of p- and
+s-polarized light.",1701.07269v1
+2002-11-05,"SU(4) Spin-Orbital Two-Leg Ladder, Square and Triangle Lattices","Based on the generalized valence bond picture, a Schwinger boson mean field
+theory is applied to the symmetric SU(4) spin-orbital systems. For a two-leg
+SU(4) ladder, the ground state is a spin-orbital liquid with a finite energy
+gap, in good agreement with recent numerical calculations. In two-dimensional
+square and triangle lattices, the SU(4) Schwinger bosons condense at
+(\pi/2,\pi/2) and (\pi/3,\pi/3), respectively. Spin, orbital, and coupled
+spin-orbital static susceptibilities become singular at the wave vectors, twice
+of which the bose condensation arises at. It is also demonstrated that there
+are spin, orbital, and coupled spin-orbital long-range orderings in the ground
+state.",0211074v1
+2013-08-29,Spin-orbit coupling and spin Hall effect for neutral atoms without spin-flips,"We propose a scheme which realizes spin-orbit coupling and the spin Hall
+effect for neutral atoms in optical lattices without relying on near resonant
+laser light to couple different spin states. The spin-orbit coupling is created
+by modifying the motion of atoms in a spin-dependent way by laser recoil. The
+spin selectivity is provided by Zeeman shifts created with a magnetic field
+gradient. Alternatively, a quantum spin Hamiltonian can be created by
+all-optical means using a period- tripling, spin-dependent superlattice.",1308.6349v1
+2003-01-28,Spin-orbital gapped phase with least symmetry breaking in the one-dimensional symmetrically coupled spin-orbital model,"To describe the spin-orbital energy gap formation in the one-dimensional
+symmetrically coupled spin-orbital model, we propose a simple mean field theory
+based on an SU(4) constraint fermion representation of spins and orbitals. A
+spin-orbital gapped phase is formed due to a marginally relevant spin-orbital
+valence bond pairing interaction. The energy gap of the spin and orbital
+excitations grows extremely slowly from the SU(4) symmetric point up to a
+maximum value and then decreases rapidly. By calculating the spin, orbital, and
+spin-orbital tensor static susceptibilities at zero temperature, we find a
+crossover from coherent to incoherent magnetic excitations as the spin-orbital
+coupling decreasing from large to small values.",0301533v2
+2013-12-11,Spin-orbit coupling in quantum gases,"Spin-orbit coupling links a particle's velocity to its quantum mechanical
+spin, and is essential in numerous condensed matter phenomena, including
+topological insulators and Majorana fermions. In solid-state materials,
+spin-orbit coupling originates from the movement of electrons in a crystal's
+intrinsic electric field, which is uniquely prescribed. In contrast, for
+ultracold atomic systems, the engineered ""material parameters"" are tuneable: a
+variety of synthetic spin-orbit couplings can be engineered on demand using
+laser fields. Here we outline the current experimental and theoretical status
+of spin-orbit coupling in ultracold atomic systems, discussing unique features
+that enable physics impossible in any other known setting.",1312.3292v1
+2012-08-28,Spin-orbit coupled particle in a spin bath,"We consider a spin-orbit coupled particle confined in a quantum dot in a bath
+of impurity spins. We investigate the consequences of spin-orbit coupling on
+the interactions that the particle mediates in the spin bath. We show that in
+the presence of spin-orbit coupling, the impurity-impurity interactions are no
+longer spin-conserving. We quantify the degree of this symmetry breaking and
+show how it relates to the spin-orbit coupling strength. We identify several
+ways how the impurity ensemble can in this way relax its spin by coupling to
+phonons. A typical resulting relaxation rate for a self-assembled Mn-doped ZnTe
+quantum dot populated by a hole is 1 $\mu$s. We also show that decoherence
+arising from nuclear spins in lateral quantum dots is still removable by a spin
+echo protocol, even if the confined electron is spin-orbit coupled.",1208.5606v1
+2023-10-08,Vortex Lattice Formation in Spin-Orbit-Coupled Spin-2 Bose-Einstein Condensate Under Rotation,"We investigate the vortex lattice configuration in a rotating spin
+orbit-coupled spin-2 Bose-Einstein condensate confined in a
+quasi-two-dimensional harmonic trap. By considering the interplay between
+rotation frequency, spin-orbit couplings, and inter atomic interactions, we
+explore a variety of vortex lattice structures emerging as a ground state
+solution. Our study focuses on the combined effects of spin-orbit coupling and
+rotation, analyzed by using the variational method for the single-particle
+Hamiltonian. We observe that the interplay between rotation and Rashba
+spin-orbit coupling gives rise to different effective potentials for the
+bosons. Specifically, at higher rotation frequencies, isotropic spin-orbit
+coupling leads to an effective toroidal potential, while fully anisotropic
+spin-orbit coupling results in a symmetric double-well potential. To obtain
+these findings, we solve the five coupled Gross-Pitaevskii equations for the
+spin-2 BEC with spin-orbit coupling under rotation. Notably, we find that the
+antiferromagnetic, cyclic, and ferromagnetic phases exhibit similar behavior at
+higher rotation.",2310.05160v1
+2007-09-21,Weak and strong coupling limits of the two-dimensional Fröhlich polaron with spin-orbit Rashba interaction,"The continuous progress in fabricating low-dimensional systems with large
+spin-orbit couplings has reached a point in which nowadays materials may
+display spin-orbit splitting energies ranging from a few to hundreds of meV.
+This situation calls for a better understanding of the interplay between the
+spin-orbit coupling and other interactions ubiquitously present in solids, in
+particular when the spin-orbit splitting is comparable in magnitude with
+characteristic energy scales such as the Fermi energy and the phonon frequency.
+  In this article, the two-dimensional Fr\""ohlich electron-phonon problem is
+reformulated by introducing the coupling to a spin-orbit Rashba potential,
+allowing for a description of the spin-orbit effects on the electron-phonon
+interaction. The ground state of the resulting Fr\""ohlich-Rashba polaron is
+studied in the weak and strong coupling limits of the electron-phonon
+interaction for arbitrary values of the spin-orbit splitting. The weak coupling
+case is studied within the Rayleigh-Schr\""odinger perturbation theory, while
+the strong-coupling electron-phonon regime is investigated by means of
+variational polaron wave functions in the adiabatic limit. It is found that,
+for both weak and strong coupling polarons, the ground state energy is
+systematically lowered by the spin-orbit interaction, indicating that the
+polaronic character is strengthened by the Rashba coupling. It is also shown
+that, consistently with the lowering of the ground state, the polaron effective
+mass is enhanced compared to the zero spin-orbit limit. Finally, it is argued
+that the crossover between weakly and strongly coupled polarons can be shifted
+by the spin-orbit interaction.",0709.3429v2
+2021-02-02,"Coupled spin-orbital fluctuations in a three orbital model for $4d$ and $5d$ oxides with electron fillings $n=3,4,5$ -- Application to $\rm NaOsO_3$, $\rm Ca_2RuO_4$, and $\rm Sr_2IrO_4$","A unified approach is presented for investigating coupled spin-orbital
+fluctuations within a realistic three-orbital model for strongly spin-orbit
+coupled systems with electron fillings $n=3,4,5$ in the $t_{2g}$ sector of
+$d_{yz},d_{xz},d_{xy}$ orbitals. A generalized fluctuation propagator is
+constructed which is consistent with the generalized self-consistent
+Hartree-Fock approximation where all Coulomb interaction contributions
+involving orbital diagonal and off-diagonal spin and charge condensates are
+included. Besides the low-energy magnon, intermediate-energy orbiton and
+spin-orbiton, and high-energy spin-orbit exciton modes, the generalized
+spectral function also shows other high-energy excitations such as the Hund's
+coupling induced gapped magnon modes. We relate the characteristic features of
+the coupled spin-orbital excitations to the complex magnetic behavior resulting
+from the interplay between electronic bands, spin-orbit coupling, Coulomb
+interactions, and structural distortion effects, as realized in the compounds
+$\rm NaOsO_3$, $\rm Ca_2RuO_4$, and $\rm Sr_2IrO_4$.",2102.01400v2
+2023-07-27,Spin-orbit torque emerging from orbital textures in centrosymmetric materials,"We unveil a hitherto concealed spin-orbit torque mechanism driven by orbital
+degrees of freedom in centrosymmetric two-dimensional transition metal
+dichalcogenides (focusing on PtSe${}_2$ ). Using first-principles simulations,
+tight-binding models and large-scale quantum transport calculations, we show
+that such a mechanism fundamentally stems from a spatial localization of
+orbital textures at opposite sides of the material, which imprints their
+symmetries onto spin-orbit coupling effects, further producing efficient and
+tunable spin-orbit torque. Our study suggests that orbital-spin entanglement at
+play in centrosymmetric materials can be harnessed as a resource for
+outperforming conventional spin-orbit torques generated by the Rashba-type
+effects.",2307.14673v1
+2001-08-01,The Rashba Effect within the Coherent Scattering Formalism,"The influence of spin-orbit coupling in two-dimensional systems is
+investigated within the framework of the Landauer-Buettiker coherent scattering
+formalism. This formalism usually deals with spin-independent stationary states
+and, therefore, it does not include a spin-orbit contribution to the current.
+In this article, we will rederive the coherent scattering formalism, accounting
+for the changes brought about by the spin-orbit coupling. After a short review
+of the features of spin-orbit coupling in two-dimensional electron gases, we
+define the creation/annihilaton operators in the stationary states of the
+spin-orbit coupling Hamiltonian and use them to calculate the current operator
+within the Landauer-Buettiker formalism. The current is expressed as it is in
+the standard spin-independent case, but with the spin label replaced by a new
+label which we call the spin-orbit coupling label. The spin-orbit coupling
+effects can then be represented in a scattering matrix which relates the
+spin-orbit coupling stationary states in different leads. This scattering
+matrix is calculated in the case of a four-port beamsplitter, and it is shown
+to mix states with different spin-orbit coupling labels in a manner that
+depends on the angle between the leads. The formalism is then used to calculate
+the effect of spin-orbit coupling on the current and noise in two examples of
+electron collision.",0108021v1
+2006-06-22,"Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps","A continuum model for the effective spin orbit interaction in graphene is
+derived from a tight-binding model which includes the $\pi$ and $\sigma$ bands.
+We analyze the combined effects of the intra-atomic spin-orbit coupling,
+curvature, and applied electric field, using perturbation theory. We recover
+the effective spin-orbit Hamiltonian derived recently from group theoretical
+arguments by Kane and Mele. We find, for flat graphene, that the intrinsic
+spin-orbit coupling $\Hi \propto \Delta^ 2$ and the Rashba coupling due to a
+perpendicular electric field ${\cal E}$, $\Delta_{\cal E} \propto \Delta$,
+where $\Delta$ is the intra-atomic spin-orbit coupling constant for carbon.
+Moreover we show that local curvature of the graphene sheet induces an extra
+spin-orbit coupling term $\Delta_{\rm curv} \propto \Delta$. For the values of
+$\cal E$ and curvature profile reported in actual samples of graphene, we find
+that $\Hi < \Delta_{\cal E} \lesssim \Delta_{\rm curv}$. The effect of
+spin-orbit coupling on derived materials of graphene, like fullerenes,
+nanotubes, and nanotube caps, is also studied. For fullerenes, only $\Hi$ is
+important. Both for nanotubes and nanotube caps $\Delta_{\rm curv}$ is in the
+order of a few Kelvins. We reproduce the known appearance of a gap and
+spin-splitting in the energy spectrum of nanotubes due to the spin-orbit
+coupling. For nanotube caps, spin-orbit coupling causes spin-splitting of the
+localized states at the cap, which could allow spin-dependent field-effect
+emission.",0606580v3
+2014-01-18,Position and Spin Control by Dynamical Ultrastrong Spin-Orbit Coupling,"Focusing on the efficient probe and manipulation of single-particle spin
+states, we investigate the coupled spin and orbital dynamics of a spin 1/2
+particle in a harmonic potential subject to ultrastrong spin-orbit interaction
+and external magnetic field. The advantage of these systems is the clear
+visualization of the strong spin-orbit coupling in the orbital dynamics. We
+also investigate the effect of a time-dependent coupling: Its nonadiabatic
+change causes an interesting interplay of spin and orbital motion which is
+related to the direction and magnitude of the applied magnetic field. This
+result suggests that orbital state manipulation can be realized through
+ultrastrong spin-orbit interactions, becoming a useful tool for handling
+entangled spin and orbital degrees of freedom to produce, for example, spin
+desirable polarizations in time interesting for spintronics implementations.",1401.4554v1
+2005-10-03,Spin relaxation in quantum dots with random spin-orbit coupling,"We investigate the longitudinal spin relaxation arising due to spin-flip
+transitions accompanied by phonon emission in quantum dots where the strength
+of the Rashba spin-orbit coupling is a random function of the lateral
+(in-plane) coordinate on the spatial nanoscale. In this case the Rashba
+contribution to the spin-orbit coupling cannot be completely removed by
+applying a uniform external bias across the quantum dot plane. Due to the
+remnant random contribution, the spin relaxation rate cannot be decreased by
+more than two orders of magnitude even when the external bias fully compensates
+the regular part of the spin-orbit coupling.",0510050v1
+2009-05-05,Transport through a band insulator with Rashba spin-orbit coupling: metal-insulator transition and spin-filtering effects,"We calculate the current-voltage characteristic of a one-dimensional band
+insulator with magnetic field and Rashba spin-orbit coupling which is connected
+to nonmagnetic leads. Without spin-orbit coupling we find a complete
+spin-filtering effect, meaning that the electric transport occurs in one spin
+channel only. For a large magnetic field which closes the band gap, we show
+that spin-orbit coupling leads to a transition from metallic to insulating
+behavior. The oscillations of the different spin-components of the current with
+the length of the transport channel are studied as well.",0905.0611v1
+2013-04-11,Large spin-orbit coupling in carbon nanotubes,"It has recently been recognized that the strong spin-orbit interaction
+present in solids can lead to new phenomena, such as materials with non-trivial
+topological order. Although the atomic spin-orbit coupling in carbon is weak,
+the spin-orbit coupling in carbon nanotubes can be significant due to their
+curved surface. Previous works have reported spin-orbit couplings in reasonable
+agreement with theory, and this coupling strength has formed the basis of a
+large number of theoretical proposals. Here we report a spin-orbit coupling in
+three carbon nanotube devices that is an order of magnitude larger than
+measured before. We find a zero-field spin splitting of up to 3.4 meV,
+corresponding to a built-in effective magnetic field of 29 T aligned along the
+nanotube axis. While the origin of the large spin-orbit coupling is not
+explained by existing theories, its strength is promising for applications of
+the spin-orbit interaction in carbon nanotubes devices.",1304.3234v1
+2020-02-18,Majorana-like localized spin density without bound states in topologically trivial spin-orbit coupled nanowires,"In the topological phase of spin-orbit coupled nanowires Majorana bound
+states are known to localize at the nanowire edges and to exhibit a spin
+density orthogonal to both the magnetic field and the spin-orbit field. By
+investigating a nanowire exposed to a uniform magnetic field with an interface
+between regions with different spin-orbit couplings, we find that the
+orthogonal spin density is pinned at the interface even when both interface
+sides are in the topologically trivial phase, and even when no bound state is
+present at all. A trivial bound state may additionally appear at the interface,
+especially if the spin-orbit coupling takes opposite signs across the
+interface. However, it can be destroyed by a smoothening of the spin-orbit
+profile or by a magnetic field component parallel to the spin-orbit field. In
+contrast, the orthogonal spin density persists in various and realistic
+parameter ranges. We also show that, while the measurement of bulk equilibrium
+spin currents has been elusive so far, such robust orthogonal spin density peak
+may provide a way to detect spin current variations across interfaces.",2002.07779v2
+2014-11-12,Fermi Gases with Synthetic Spin-Orbit Coupling,"We briefly review recent progress on ultracold atomic Fermi gases with
+different types of synthetic spin-orbit coupling, including the one-dimensional
+(1D) equal weight Rashba-Dresselhaus and two-dimensional (2D) Rasbha spin-orbit
+couplings. Theoretically, we show how the single-body, two-body and many-body
+properties of Fermi gases are dramatically changed by spin-orbit coupling. In
+particular, the interplay between spin-orbit coupling and interatomic
+interaction may lead to several long-sought exotic superfluid phases at low
+temperatures, such as anisotropic superfluid, topological superfluid and
+inhomogeneous superfluid. Experimentally, only the first type - equal weight
+combination of Rasbha and Dresselhaus spin-orbit couplings - has been realized
+very recently using a two-photon Raman process. We show how to characterize a
+normal spin-orbit coupled atomic Fermi gas in both non-interacting and
+strongly-interacting limits, using particularly momentum-resolved
+radio-frequency spectroscopy. The experimental demonstration of a
+strongly-interacting spin-orbit coupled Fermi gas opens a promising way to
+observe various exotic superfluid phases in the near future.",1411.3043v1
+2024-01-19,Extremely strong spin-orbit coupling effect in light element altermagnetic materials,"Spin-orbit coupling is a key to realize many novel physical effects in
+condensed matter physics, but the mechanism to achieve strong spin-orbit
+coupling effect in light element antiferromagnetic compounds has not been
+explored. In this work, based on symmetry analysis and the first-principles
+electronic structure calculations, we demonstrate that strong spin-orbit
+coupling effect can be realized in light element altermagnetic materials, and
+propose a mechanism for realizing the corresponding effective spin-orbit
+coupling. This mechanism reveals the cooperative effect of crystal symmetry,
+electron occupation, electronegativity, electron correlation, and intrinsic
+spin-orbit coupling. Our work not only promotes the understanding of light
+element compounds with strong spin-orbit coupling effect, but also provides an
+alternative for realizing light element compounds with an effective strong
+spin-orbit coupling.",2401.11065v1
+2012-11-09,Spin-orbit Coupled Bose-Einstein Condensates in Spin-dependent Optical Lattices,"We investigate the ground-state properties of spin-orbit coupled
+Bose-Einstein condensates in spin-dependent optical lattices. The competition
+between the spin-orbit coupling strength and the depth of the optical lattice
+leads to a rich phase diagram. Without spin-orbit coupling, the spin-dependent
+optical lattices separate the condensates into alternating spin domains with
+opposite magnetization directions. With relatively weak spin-orbit coupling,
+the spin domain wall is dramatically changed from N\'{e}el wall to Bloch wall.
+For sufficiently strong spin-orbit coupling, vortex chains and antivortex
+chains are excited in the spin-up and spin-down domains respectively,
+corresponding to the formation of a lattice composed of meron-pairs and
+antimeron-pairs in the pseudospin representation. We also discuss how to
+observe these phenomena in real experiments.",1211.2097v3
+2015-04-11,Collapse of spin-orbit coupled Bose-Einstein condensates,"A finite-size quasi two-dimensional Bose-Einstein condensate collapses if the
+attraction between atoms is sufficiently strong. Here we present a theory of
+collapse for condensates with the interatomic attraction and spin-orbit
+coupling. We consider two realizations of spin-orbit coupling: the axial Rashba
+coupling and balanced, effectively one-dimensional, Rashba-Dresselhaus one. In
+both cases spin-dependent ""anomalous"" velocity, proportional to the spin-orbit
+coupling strength, plays a crucial role. For the Rashba coupling, this velocity
+forms a centrifugal component in the density flux opposite to that arising due
+to the attraction between particles and prevents the collapse at a sufficiently
+strong coupling. For the balanced Rashba-Dresselhaus coupling, the
+spin-dependent velocity can spatially split the initial state in one dimension
+and form spin-projected wavepackets, reducing the total condensate density.
+Depending on the spin-orbit coupling strength, interatomic attraction, and the
+initial state, this splitting either prevents the collapse or modifies the
+collapse process. These results show that the collapse can be controlled by a
+spin-orbit coupling, thus, extending the domain of existence of condensates of
+attracting atoms.",1504.02860v1
+2015-05-16,Dynamics of a macroscopic spin qubit in spin-orbit coupled Bose-Einstein condensates,"We consider a macroscopic spin qubit based on spin-orbit coupled
+Bose-Einstein condensates, where, in addition to the spin-orbit coupling, spin
+dynamics strongly depends on the interaction between particles. The evolution
+of the spin for freely expanding, trapped, and externally driven condensates is
+investigated. For condensates oscillating at the frequency corresponding to the
+Zeeman splitting in the synthetic magnetic field, the spin Rabi frequency does
+not depend on the interaction between the atoms since it produces only internal
+forces and does not change the total momentum. However, interactions and
+spin-orbit coupling bring the system into a mixed spin state, where the total
+spin is inside rather than on the Bloch sphere. This greatly extends the
+available spin space making it three-dimensional, but imposes limitations on
+the reliable spin manipulation of such a macroscopic qubit. The spin dynamics
+can be modified by introducing suitable spin-dependent initial phases,
+determined by the spin-orbit coupling, in the spinor wave function.",1505.04301v1
+2005-07-01,Spin-orbit coupling and spin transport,"Recent achievements in semiconductor spintronics are discussed. Special
+attention is paid to spin-orbit interaction, coupling of electron spins to
+external electric fields, and spin transport in media with spin-orbit coupling,
+including the mechanisms of spin-Hall effect. Importance of spin-transport
+parameters at spin-precession wave vector $k_{\rm so}$ is emphasized, and
+existence of an universal relation between spin currents and spin accumulation
+at the spatial scale of $\ell_{\rm so}\approx k_{\rm so}^{-1}$ is conjectured.",0507007v2
+2015-05-14,Spatiotemporal spin fluctuations caused by spin-orbit-coupled Brownian motion,"We develop a theory of thermal fluctuations of spin density emerging in a
+two-dimensional electron gas. The spin fluctuations probed at spatially
+separated spots of the sample are correlated due to Brownian motion of
+electrons and spin-obit coupling. We calculate the spatiotemporal correlation
+functions of the spin density for both ballistic and diffusive transport of
+electrons and analyze them for different types of spin-orbit interaction
+including the isotropic Rashba model and persistent spin helix regime. The
+measurement of spatial spin fluctuations provides direct access to the
+parameters of spin-orbit coupling and spin transport in conditions close to the
+thermal equilibrium.",1505.03826v1
+2022-07-13,Jahn-Teller states mixed by spin-orbit coupling in an electromagnetic field,"Spin-orbit coupling plays a pivotal role in condensed matter physics. For
+instance, spin-orbit interactions affect the magnetization and transport
+dynamics in solids, while spins and momenta are locked in topological matter.
+Alternatively, spin-orbit entanglement may play an important role in exotic
+phenomena, like quantum spin liquids in 4d and 5d systems. An interesting
+question is how electronic states mixed by spin orbit coupling interact with
+electromagnetic fields, which may hold potential to tune their properties and
+reveal interesting physics. Motivated by our recent discovery of large
+gyrotropic signals in some Jahn-Teller manganites, here we explore the
+interaction of light with spin-mixed states in a d4 transition metal. We show
+that spin-orbit mixing enables electronic transitions that are sensitive to
+circularly polarized light, giving rise to a gyrotropic response that increases
+with spin-orbit coupling. Interestingly, photoexcited transitions that involve
+spin reversal are behind such gyrotropic resonances. Additionally, we find that
+the interaction with the electromagnetic field depends strongly on the relative
+orientation of the propagation of light with respect to Jahn-Teller distortions
+and spin quantization. We suggest that such interactions offer the opportunity
+to use electromagnetic waves at optical wavelengths to entangle orbital and
+spin degrees of freedom. Our approach, which includes a group-theoretical
+treatment of spin-orbit coupling, has wide applicability and provides a
+versatile tool to explore the interaction of electromagnetic fields with
+electronic states in transition metals with arbitrary spin-orbit coupling
+strength and pointgroup symmetries.",2207.06501v1
+2016-06-27,Nonreciprocal Transverse Photonic Spin and Magnetization-Induced Electromagnetic Spin-Orbit Coupling,"A study of nonreciprocal transverse-spin angular-momentum-density shifts for
+evanescent waves in magneto-optic waveguide media is presented. Their
+functional relation to electromagnetic spin- and orbital-momenta is presented
+and analyzed. It is shown that the magneto-optic gyrotropy can be
+re-interpreted as the nonreciprocal electromagnetic spin-density shift per unit
+energy flux, thus providing an interesting alternative physical picture for the
+magneto-optic gyrotropy. The transverse spin-density shift is found to be
+thickness-dependent in slab optical waveguides. This dependence is traceable to
+the admixture of minority helicity components in the transverse spin angular
+momentum. It is also shown that the transverse spin is magnetically tunable. A
+formulation of electromagnetic spin-orbit coupling in magneto-optic media is
+presented, and an alternative source of spin-orbit coupling to non-paraxial
+optics vortices is proposed. It is shown that magnetization-induced
+electromagnetic spin-orbit coupling is possible, and that it leads to spin to
+orbital angular momentum conversion in magneto-optic media evanescent waves.",1606.08334v2
+2022-06-10,Quantum heat engine based on a spin-orbit and Zeeman-coupled Bose-Einstein condensate,"We explore the potential of a spin-orbit coupled Bose-Einstein condensate for
+thermodynamic cycles. For this purpose we propose a quantum heat engine based
+on a condensate with spin-orbit and Zeeman coupling as a working medium. The
+cooling and heating are simulated by contacts of the condensate with an
+external magnetized media and demagnetized media. We examine the condensate
+ground state energy and its dependence on the strength of the synthetic
+spin-orbit and Zeeman couplings and interatomic interaction. Then we study the
+efficiency of the proposed engine. The cycle has a critical value of spin-orbit
+coupling related to the engine maximum efficiency.",2206.05041v1
+2005-06-23,Spin properties of single electron states in coupled quantum dots,"Spin properties of single electron states in laterally coupled quantum dots
+in the presence of a perpendicular magnetic field are studied by exact
+numerical diagonalization. Dresselhaus (linear and cubic) and Bychkov-Rashba
+spin-orbit couplings are included in a realistic model of confined dots based
+on GaAs. Group theoretical classification of quantum states with and without
+spin orbit coupling is provided. Spin-orbit effects on the g-factor are rather
+weak. It is shown that the frequency of coherent oscillations (tunneling
+amplitude) in coupled dots is largely unaffected by spin-orbit effects due to
+symmetry requirements. The leading contributions to the frequency involves the
+cubic term of the Dresselhaus coupling. Spin-orbit coupling in the presence of
+magnetic field leads to a spin-dependent tunneling amplitude, and thus to the
+possibility of spin to charge conversion, namely spatial separation of spin by
+coherent oscillations in a uniform magnetic field. It is also shown that spin
+hot spots exist in coupled GaAs dots already at moderate magnetic fields, and
+that spin hot spots at zero magnetic field are due to the cubic Dresselhaus
+term only.",0506610v1
+2012-11-05,Spin-orbital Texture in Topological Insulators,"Relativistic spin-orbit coupling plays an essential role in the field of
+topological insulators and quantum spintronics. It gives rise to the
+topological non-trivial band structure and enables electric manipulation of the
+spin degree of freedom. Because of the spin-orbit coupling, rich spin-orbital
+coupled textures can exist both in momentum and in real space. For three
+dimensional topological insulators in the Bi$_2$Se$_3$ family, topological
+surface states with p$_z$ orbitals have a left-handed spin texture for the
+upper Dirac cone and a right-handed spin texture for the lower Dirac cone. In
+this work, we predict a new form of the spin-orbital texture associated with
+the p$_x$ and p$_y$ orbitals. For the upper Dirac cone, a left-handed
+(right-handed) spin texture is coupled to the ""radial"" (""tangential"") orbital
+texture, whereas for the lower Dirac cone, the coupling of spin and orbital
+textures is the exact opposite. The ""tangential"" (""radial"") orbital texture is
+dominant for the upper (lower) Dirac cone, leading to the right-handed spin
+texture for the in-plane orbitals of both the upper and lower Dirac cones. A
+spin-resovled and photon polarized angle-resolved photoemission spectroscopy
+experiment is proposed to observe this novel spin-orbital texture.",1211.0762v1
+2012-06-14,Magnetic ordering phenomena of interacting quantum spin Hall models,"The two-dimensional Hubbard model defined for topological band structures
+exhibiting a quantum spin Hall effect poses fundamental challenges in terms of
+phenomenological characterization and microscopic classification. In the limit
+of infinite coupling U at half filling, the spin model Hamiltonians resulting
+from a strong coupling expansion show various forms of magnetic ordering
+phenomena depending on the underlying spin-orbit coupling terms. We investigate
+the infinite U limit of the Kane-Mele Hubbard model with z-axis intrinsic
+spin-orbit coupling as well as its generalization to a generically
+multi-directional spin orbit term which has been claimed to account for the
+physical scenario in monolayer Na2IrO3. We find that the axial spin symmetry
+which is kept in the former but broken in the latter has a fundamental impact
+on the magnetic phase diagram as we vary the spin orbit coupling strength.
+While the Kane-Mele spin model shows a continuous evolution from conventional
+honeycomb Neel to XY antiferromagnetism which avoids the frustration imposed by
+the increased spin-orbit coupling, the multi-directional spin-orbit term
+induces a commensurate to incommensurate transition at intermediate coupling
+strength, and yields a complex spiral state with a 72 site unit cell in the
+limit of infinite spin-orbit coupling. From our findings, we conjecture that in
+the case of broken axial spin symmetry there is a large propensity for an
+additional phase at sufficiently large spin-orbit coupling and intermediate U.",1206.3103v2
+2010-12-27,The multi-state CASPT2 spin-orbit method,"We propose the multi-state complete-active-space second-order perturbation
+theory spin-orbit method (MS-CASPT2-SO) for electronic structure calculations.
+It is a two-step spin-orbit coupling method that does not make use of energy
+shifts and that intrinsically guarantees the correct characters of the small
+space wave functions that are used to calculate the spin-orbit couplings, in
+contrast with previous two-step methods.",1012.5572v1
+2011-06-21,Effective one body Hamiltonian of two spinning black-holes with next-to-next-to-leading order spin-orbit coupling,"Building on the recently computed next-to-next-to-leading order (NNLO)
+post-Newtonian (PN) spin-orbit Hamiltonian for spinning binaries
+\cite{Hartung:2011te} we extend the effective-one-body (EOB) description of the
+dynamics of two spinning black-holes to NNLO in the spin-orbit interaction. The
+calculation that is presented extends to NNLO the next-to-leading order (NLO)
+spin-orbit Hamiltonian computed in Ref. \cite{Damour:2008qf}. The present EOB
+Hamiltonian reproduces the spin-orbit coupling through NNLO in the
+test-particle limit case. In addition, in the case of spins parallel or
+antiparallel to the orbital angular momentum, when circular orbits exist, we
+find that the inclusion of NNLO spin-orbit terms moderates the effect of the
+NLO spin-orbit coupling.",1106.4349v3
+2014-07-13,Orbital angular momentum driven intrinsic spin Hall effect,"We propose a mechanism of intrinsic spin Hall effect (SHE). In this
+mechanism, local orbital angular momentum (OAM) induces electron position shift
+and couples with the bias electric field to generate orbital Hall effect (OHE).
+SHE then emerges as a concomitant effect of OHE through the atomic spin-orbit
+coupling. Spin Hall conductivity due to this mechanism is estimated to be
+comparable to experimental values for heavy metals. This mechanism predicts the
+sign change of the spin Hall conductivity as the spin-orbit polarization
+changes its sign, and also correlation between the spin Hall conductivity and
+the splitting of the Rashba-type spin splitting at surfaces.",1407.3446v1
+2010-04-08,Spin-charge and spin-orbital coupling effects on spin dynamics in ferromagnetic manganites,"Correlation-induced spin-charge and spin-orbital coupling effects on spin
+dynamics in ferromagnetic manganites are calculated with realistic parameters
+in order to provide a quantitative comparison with experimental results for
+spin stiffness, magnon dispersion, magnon damping, anomalous zone-boundary
+magnon softening, and Curie temperature. The role of orbital degeneracy,
+orbital ordering, and orbital correlations on spin dynamics in different doping
+regimes is highlighted.",1004.1352v2
+2016-07-29,Twisted spin vortices in a spinor-dipolar Bose-Einstein condensate with Rashba spin-orbit coupling,"We consider a spin-1 Bose-Einstein condensate with Rashba spin-orbit coupling
+and dipole-dipole interaction confined in a cigar-shaped trap. Due to the
+combined effects of spin-orbit coupling, dipole-dipole interaction, and trap
+geometry, the system exhibits a rich variety of ground-state spin structures,
+including twisted spin vortices. The ground-state phase diagram is determined
+with respect to the strengths of the spin-orbit coupling and dipole-dipole
+interaction.",1607.08724v1
+2021-06-09,Chiral control of quantum states in non-Hermitian spin-orbit-coupled fermions,"Spin-orbit coupling is an essential mechanism underlying quantum phenomena
+such as the spin Hall effect and topological insulators. It has been widely
+studied in well-isolated Hermitian systems, but much less is known about the
+role dissipation plays in spin-orbit-coupled systems. Here, we implement
+dissipative spin-orbit-coupled bands filled with ultracold fermions, and
+observe parity-time symmetry breaking as a result of the competition between
+the spin-orbit coupling and dissipation. Tunable dissipation, introduced by
+state-selective atom loss, enables us to tune the energy gap and close it at
+the critical dissipation value, the so-called exceptional point. In the
+vicinity of the critical point, the state evolution exhibits a chiral response,
+which enables us to tune the spin-orbit coupling and dissipation dynamically,
+revealing topologically robust chiral spin transfer when the quantum state
+encircles the exceptional point. This demonstrates that we can explore
+non-Hermitian topological states with spin-orbit coupling.",2106.04874v2
+2013-10-15,Vanishing of interband light absorption in a persistent spin helix state,"Spin-orbit coupling plays an important role in various properties of very
+different materials. Moreover efforts are underway to control the degree and
+quality of spin-orbit coupling in materials with a concomitant control of
+transport properties. We calculate the frequency dependent optical conductivity
+in systems with both Rashba and Dresselhaus spin-orbit coupling. We find that
+when the linear Dresselhaus spin-orbit coupling is tuned to be equal to the
+Rashba spin-orbit coupling, the interband optical conductivity disappears. This
+is taken to be the signature of the recovery of SU(2) symmetry. The presence of
+the cubic Dresselhaus spin-orbit coupling modifies the dispersion relation of
+the charge carriers and the velocity operator. Thus the conductivity is
+modified, but the interband contribution remains suppressed at most but not all
+photon energies for a cubic coupling of reasonable magnitude. Hence, such a
+measurement can serve as a diagnostic probe of engineered spin-orbit coupling.",1310.3916v1
+2010-07-28,Current-induced torques in the presence of spin-orbit coupling,"In systems with strong spin-orbit coupling, the relationship between
+spin-transfer torque and the divergence of the spin current is generalized to a
+relation between spin transfer torques, total angular momentum current, and
+mechanical torques. In ferromagnetic semiconductors, where the spin-orbit
+coupling is large, these considerations modify the behavior of the spin
+transfer torques. One example is a persistent spin transfer torque in a spin
+valve: the spin transfer torque does not decay away from the interface, but
+approaches a constant value. A second example is a mechanical torque at single
+ferromagnetic-nonmagnetic interface.",1007.5037v1
+2021-02-10,Suppression of effective spin-orbit coupling by thermal fluctuations in spin-orbit coupled antiferromagnets,"We apply the finite-temperature variational cluster approach to a strongly
+correlated and spin-orbit coupled model for four electrons (i.e. two holes) in
+the $t_{2g}$ subshell. We focus on parameters suitable for antiferromagnetic
+Mott insulators, in particular Ca$_2$RuO$_4$, and identify a crossover from the
+low-temperature regime, where spin-orbit coupling is essential, to the
+high-temperature regime where it leaves few signatures. The crossover is seen
+in one-particle spectra, where $xz$ and $yz$ spectra are almost one dimensional
+(as expected for weak spin-orbit coupling) at high temperature. At lower
+temperature, where spin-orbit coupling mixes all three orbitals, they become
+more two dimensional. However, stronger effects are seen in two-particle
+observables like the weight in states with definite onsite angular momentum. We
+thus identify the enigmatic intermediate-temperature 'orbital-order phase
+transition', which has been reported in various X-ray diffraction and
+absorption experiments at $T\approx 260\;K$, as the signature of the onset of
+spin-orbital correlations.",2102.05489v1
+2016-04-20,Second post-Newtonian Lagrangian dynamics of spinning compact binaries,"The leading-order spin-orbit coupling is included in a post-Newtonian
+Lagrangian formulation of spinning compact binaries, which consists of the
+Newtonian term, first post-Newtonian (1PN) and 2PN non-spin terms and 2PN
+spin-spin coupling. This makes a 3PN spin-spin coupling occur in the derived
+Hamiltonian. The spin-spin couplings are mainly responsible for chaos in the
+Hamiltonians. However, the 3PN spin-spin Hamiltonian is small and has different
+signs, compared with the 2PN spin-spin Hamiltonian equivalent to the 2PN
+spin-spin Lagrangian. As a result, the probability of the occurrence of chaos
+in the Lagrangian formulation without the spin-orbit coupling is larger than
+that in the Lagrangian formulation with the spin-orbit coupling. Numerical
+evidences support the claim.",1604.05810v2
+2001-09-13,Formation of energy gap in higher dimensional spin-orbital liquids,"A Schwinger boson mean field theory is developed for spin liquids in a
+symmetric spin-orbital model in higher dimensions. Spin, orbital and coupled
+spin-orbital operators are treated equally. We evaluate the dynamic correlation
+functions and collective excitations spectra. As the collective excitations
+have a finite energy gap, we conclude that the ground state is a spin-orbital
+liquid with a two-fold degeneracy, which breaks the discrete spin-orbital
+symmetry. Possible relevence of this spin liquid state to several realistic
+systems, such as CaV$_4$V$_9$ and Na$_2$Sb$_2$Ti$_2$O, are discussed.",0109234v1
+2018-09-20,Multiple-$Q$ magnetic orders in Rashba-Dresselhaus metals,"We study magnetic textures realized in noncentrosymmetric Kondo lattice
+models, in which localized magnetic moments weakly interact with itinerant
+electrons subject to Rashba and Dresselhaus spin-orbit couplings. By virtue of
+state-of-the-art numerical simulations as well as variational calculations, we
+uncover versatile multiple-$Q$ orderings under zero magnetic field, which are
+found to originate in the instabilities of the Fermi surface whose spin
+degeneracy is lifted by the spin-orbit couplings. In the case with
+equally-strong Rashba and Dresselhaus spin-orbit couplings, which is known to
+realize a persistent spin helix in semiconductor quantum wells, we discover a
+sextuple-$Q$ magnetic ordering with a checkerboard-like spatial pattern of the
+spin scalar chirality. In the presence of either Rashba or Dresselhaus
+spin-orbit coupling, we find out another multiple-$Q$ ordering, which is
+distinct from Skyrmion crystals discussed under the same symmetry. Our results
+indicate that the cooperation of the spin-charge and spin-orbit couplings
+brings about richer magnetic textures than those studied within effective spin
+models. The situations would be experimentally realized, e.g., in
+noncentrosymmetric heavy-fermion compounds and heterostructures of spin-orbit
+coupled metals and magnetic insulators.",1809.07582v1
+2007-01-11,Some exact identities connecting one- and two-particle Green's functions in spin-orbit coupling systems,"Some exact identities connecting the one- and two-particle Green's functions
+in the presence of spin-orbit coupling have been derived. These identities is
+similar to the usual Ward identity in the particle or charge transport theory
+and a satisfying spin transport theory in spin-orbit coupling system should
+also preserve these identities.",0701227v1
+2015-07-25,Quantum entanglement in the one-dimensional spin-orbital SU(2)$\otimes XXZ$ model,"We investigate the phase diagram and the spin-orbital entanglement of a
+one-dimensional SU(2)$\otimes XXZ$ model with SU(2) spin exchange and
+anisotropic $XXZ$ orbital exchange interactions and negative exchange coupling.
+As a unique feature, the spin-orbital entanglement entropy in the entangled
+ground states increases here linearly with system size. In the case of Ising
+orbital interactions we identify an emergent phase with long-range spin-singlet
+dimer correlations triggered by a quadrupling of correlations in the orbital
+sector. The peculiar translational invariant spin-singlet dimer phase has
+finite von Neumann entanglement entropy and survives when orbital quantum
+fluctuations are included. It even persists in the isotropic
+SU(2)$\otimes$SU(2) limit. Surprisingly, for finite transverse orbital coupling
+the long-range spin singlet correlations also coexist in the antiferromagnetic
+spin and alternating orbital phase making this phase also unconventional.
+Moreover we also find a complementary orbital singlet phase that exists in the
+isotropic case but does not extend to the Ising limit. The nature of
+entanglement appears essentially different from that found in the frequently
+discussed model with positive coupling. Furthermore we investigate the
+collective spin and orbital wave excitations of the disentangled
+ferromagnetic-spin/ferro-orbital ground state and explore the continuum of
+spin-orbital excitations. Interestingly one finds among the latter excitations
+two modes of exciton bound states. Their spin-orbital correlations differ from
+the remaining continuum states and exhibit logarithmic scaling of the von
+Neumann entropy with increasing system size.",1507.07103v1
+2015-11-16,Drude weight and optical conductivity of a two-dimensional heavy-hole gas with $k$-cubic spin-orbit interactions,"We present detailed theoretical study on zero-frequency Drude weight and
+optical conductivity of a two-dimensional heavy-hole gas(2DHG) with $k$-cubic
+Rashba and Dresselhaus spin-orbit interactions. The presence of $k$-cubic
+spin-orbit couplings strongly modifies the Drude weight in comparison to the
+electron gas with $k$-linear spin-orbit couplings. For large hole density and
+strong $k$-cubic spin-orbit couplings, the density dependence of Drude weight
+deviates from the linear behavior. We establish a relation between optical
+conductivity and the Berry connection. Unlike two-dimensional electron gas with
+$k$-linear spin-orbit couplings, we explicitly show that the optical
+conductivity does not vanish even for equal strength of the two spin-orbit
+couplings. We attribute this fact to the non-zero Berry phase for equal
+strength of $k$-cubic spin-orbit couplings. The least photon energy needed to
+set in the optical transition in hole gas is one order of magnitude smaller
+than that of electron gas. Types of two van Hove singularities appear in the
+optical spectrum are also discussed.",1511.04917v3
+2017-04-03,Inverse spin galvanic effect in the presence of impurity spin-orbit scattering: a diagrammatic approach,"Spin-charge interconversion is currently the focus of intensive experimental
+and theoretical research both for its intrinsic interest and for its potential
+exploitation in the realization of new spintronic functionalities. Spin-orbit
+coupling is one of the key microscopic mechanisms to couple charge currents and
+spin polarizations. The Rashba spin-orbit coupling in a two-dimensional
+electron gas has been shown to give rise to the inverse spin galvanic effect,
+i.e. the generation of a non-equilibrium spin polarization by a charge current.
+Whereas the Rashba model may be applied to the interpretation of experimental
+results in many cases, in general in a given real physical system spin-orbit
+coupling also occurs due other mechanisms such as Dresselhaus bulk inversion
+asymmetry and scattering from impurities. In this work we consider the inverse
+spin galvanic effect in the presence of Rashba, Dresselhaus and impurity
+spin-orbit scattering. We find that the size and form of the inverse spin
+galvanic effect is greatly modified by the presence of the various sources of
+spin-orbit coupling. Indeed, spin-orbit coupling affects the spin relaxation
+time by adding the Elliott-Yafet mechanism to the Dyakonov-Perel and,
+furthermore, it changes the non-equilibrium value of the current-induced spin
+polarization by introducing a new spin generation torque. We use a diagrammatic
+Kubo formula approach to evaluate the spin polarization-charge current response
+function. We finally comment about the relevance of our results for the
+interpretation of experimental results.",1704.00532v1
+2010-03-08,Spin-orbit coupling in a graphene bilayer and in graphite,"The intrinsic spin-orbit interactions in bilayer graphene and in graphite are
+studied, using a tight binding model, and an intraatomic LS coupling. The
+spin-orbit interactions in bilayer graphene and graphite are larger, by about
+one order of magnitude, than the interactions in single layer graphene, due to
+the mixing of pi and sigma bands by interlayer hopping. Their value is in the
+range 0.1 - 1K. The spin-orbit coupling opens a gap in bilayer graphene, and it
+also gives rise to two edge modes. The spin-orbit couplings are largest, 1-4K,
+in orthorhombic graphite, which does not have a center of inversion.",1003.1618v1
+2022-02-28,Observation of long-range orbital transport and giant orbital torque,"Modern spintronics relies on the generation of spin currents through
+spin-orbit coupling. The spin-current generation has been believed to be
+triggered by current-induced orbital dynamics, which governs the angular
+momentum transfer from the lattice to the electrons in solids. The fundamental
+role of the orbital response in the angular momentum dynamics suggests the
+importance of the orbital counterpart of spin currents: orbital currents.
+However, evidence for its existence has been elusive. Here, we demonstrate the
+generation of giant orbital currents and uncover fundamental features of the
+orbital response. We experimentally and theoretically show that orbital
+currents propagate over longer distances than spin currents by more than an
+order of magnitude in a ferromagnet and nonmagnets. Furthermore, we find that
+the orbital current enables electric manipulation of magnetization with
+efficiencies significantly higher than the spin counterpart. These findings
+open the door to orbitronics that exploits orbital transport and spin-orbital
+coupled dynamics in solid-state devices.",2202.13896v2
+2005-01-09,Electron Spin Dynamics in Impure Quantum Wells for Arbitrary Spin-Orbit Coupling,"Strong interest has arisen recently on low-dimensional systems with strong
+spin-orbit interaction due to their peculiar properties of interest for some
+spintronic applications. Here, the time evolution of the electron spin
+polarization of a disordered two-dimensional electron gas is calculated exactly
+within the Boltzmann formalism for arbitrary couplings to a Rashba spin-orbit
+field. The classical Dyakonov-Perel mechanism of spin relaxation is shown to
+fail for sufficiently strong Rashba fields, in which case new regimes of spin
+decay are identified. These results suggest that spin manipulation can be
+greatly improved in strong spin-orbit interaction materials.",0501174v3
+2007-09-21,Spin-orbit mediated anisotropic spin interaction in interacting electron systems,"We investigate interactions between spins of strongly correlated electrons
+subject to the spin-orbit interaction. Our main finding is that of a novel,
+spin-orbit mediated anisotropic spin-spin coupling of the van der Waals type.
+Unlike the standard exchange, this interaction does not require the wave
+functions to overlap. We argue that this ferromagnetic interaction is important
+in the Wigner crystal state where the exchange processes are severely
+suppressed. We also comment on the anisotropy of the exchange between spins
+mediated by the spin-orbital coupling.",0709.3521v2
+2012-03-06,Short-range correlations in dilute atomic Fermi gases with spin-orbit coupling,"We study the short-range correlation strength of three dimensional spin half
+dilute atomic Fermi gases with spin-orbit coupling. The interatomic interaction
+is modeled by the contact pseudopotential. In the high temperature limit, we
+derive the expression for the second order virial expansion of the
+thermodynamic potential via the ladder diagrams. We further evaluate the second
+order virial expansion in the limit that the spin-orbit coupling constants are
+small, and find that the correlation strength between the fermions increases as
+the forth power of the spin-orbit coupling constants. At zero temperature, we
+consider the cases in which there are symmetric spin-orbit couplings in two or
+three directions. In such cases, there is always a two-body bound state of zero
+net momentum. In the limit that the average interparticle distance is much
+larger than the dimension of the two-body bound state, the system primarily
+consists of condensed bosonic molecules that fermions pair to form; we find
+that the correlation strength also becomes bigger compared to that in the
+absence of spin-orbit coupling. Our results indicate that generic spin-orbit
+coupling enhances the short-range correlations of the Fermi gases. Measurement
+of such enhancement by photoassociation experiment is also discussed.",1203.1159v1
+2018-02-01,Spin Seebeck effect and thermal spin galvanic effect in Ni80Fe20/p-Si bilayers,"The development of spintronics and spin-caloritronics devices need efficient
+generation, detection and manipulation of spin current. The thermal spin
+current from spin-Seebeck effect has been reported to be more energy efficient
+than the electrical spin injection methods. But, spin detection has been the
+one of the bottlenecks since metals with large spin-orbit coupling is an
+essential requirement. In this work, we report an efficient thermal generation
+and interfacial detection of spin current. We measured a spin-Seebeck effect in
+Ni80Fe20 (25 nm)/p-Si (50 nm) (polycrystalline) bilayers without heavy metal
+spin detector. The p-Si, having the centosymmetric crystal structure, has
+insignificant intrinsic spin-orbit coupling leading to negligible spin-charge
+conversion. We report a giant inverse spin-Hall effect, essential for detection
+of spin-Seebeck effect, in the Ni80Fe20/p-Si bilayer structure, which
+originates from Rashba spin orbit coupling due to structure inversion asymmetry
+at the interface. In addition, the thermal spin pumping in p-Si leads to spin
+current from p-Si to Ni80Fe20 layer due to thermal spin galvanic effect and
+spin-Hall effect causing spin-orbit torques. The thermal spin-orbit torques
+leads to collapse of magnetic hysteresis of 25 nm thick Ni80Fe20 layer. The
+thermal spin-orbit torques can be used for efficient magnetic switching for
+memory applications. These scientific breakthroughs may give impetus to the
+silicon spintronics and spin-caloritronics devices.",1802.00132v1
+2017-03-18,Spin-orbit scattering visualized in quasiparticle interference,"In the presence of spin-orbit coupling, electron scattering off impurities
+depends on both spin and orbital angular momentum of electrons -- spin-orbit
+scattering. Although some transport properties are subject to spin-orbit
+scattering, experimental techniques directly accessible to this effect are
+limited. Here we show that a signature of spin-orbit scattering manifests
+itself in quasiparticle interference (QPI) imaged by spectroscopic-imaging
+scanning tunneling microscopy. The experimental data of a polar semiconductor
+BiTeI are well reproduced by numerical simulations with the $T$-matrix
+formalism that include not only scalar scattering normally adopted but also
+spin-orbit scattering stronger than scalar scattering. To accelerate the
+simulations, we extend the standard efficient method of QPI calculation for
+momentum-independent scattering to be applicable even for spin-orbit
+scattering. We further identify a selection rule that makes spin-orbit
+scattering visible in the QPI pattern. These results demonstrate that
+spin-orbit scattering can exert predominant influence on QPI patterns and thus
+suggest that QPI measurement is available to detect spin-orbit scattering.",1703.06234v1
+2011-11-17,Intrinsic Spin Swapping,"Here, we study diffusive spin transport in two dimensions and demonstrate
+that an intrinsic analog to a previously predicted extrinsic spin swapping
+effect, where the spin polarization and the direction of flow are interchanged
+due to spin-orbit coupling at extrinsic impurities, can be induced by intrinsic
+(Rashba) spin-orbit coupling. The resulting accumulation of intrinsically
+spin-swapped polarizations is shown to be much larger than for the extrinsic
+effect. Intrinsic spin swapping is particularly strong when the system
+dimensions exceed the spin-orbit precession length and the generated transverse
+spin currents are of the order of the injected primary spin currents. In
+contrast, spin accumulations and spin currents caused by extrinsic spin
+swapping are proportional to the spin-orbit coupling. We present numerical and
+analytical results for the secondary spin currents and accumulations generated
+by intrinsic spin swapping, and we derive analytic expressions for the induced
+spin accumulation at the edges of a narrow strip, where a long-range
+propagation of spin polarizations takes place.",1111.4072v2
+2017-10-09,Tunable superconducting critical temperature in ballistic hybrid structures with strong spin-orbit coupling,"We present a theoretical description and numerical simulations of the
+superconducting transition in hybrid structures including strong spin-orbit
+interactions. The spin-orbit coupling is taken to be of Rashba type for
+concreteness, and we allow for an arbitrary magnitude of the spin-orbit
+strength as well as an arbitrary thickness of the spin-orbit coupled layer.
+This allows us to make contact with the experimentally relevant case of
+enhanced interfacial spin-orbit coupling via atomically thin heavy metal
+layers. We consider both interfacial spin-orbit coupling induced by inversion
+asymmetry in an S/F-junction, as well as in-plane spin-orbit coupling in the
+ferromagnetic region of an S/F/S- and an S/F-structure. Both the pair
+amplitudes, local density of states and critical temperature show dependency on
+the Rashba strength and, importantly, the orientation of the exchange field. In
+general, spin-orbit coupling increases the critical temperature of a proximity
+system where a magnetic field is present, and enhances the superconducting gap
+in the density of states. We perform a theoretical derivation which explains
+these results by the appearance of long-ranged singlet correlations. Our
+results suggest that $T_c$ in ballistic spin-orbit coupled superconducting
+structures may be tuned by using only a single ferromagnetic layer.",1710.03228v2
+2021-04-14,Spin-orbit gaps in the s and p orbital bands of an artificial honeycomb lattice,"Muffin-tin methods have been instrumental in the design of honeycomb lattices
+that show, in contrast to graphene, separated s and in-plane p bands, a p
+orbital Dirac cone, and a p orbital flat band. Recently, such lattices have
+been experimentally realized using the 2D electron gas on Cu(111). A possible
+next avenue is the introduction of spin-orbit coupling to these systems.
+Intrinsic spin-orbit coupling is believed to open topological gaps, and create
+a topological flat band. Although Rashba coupling is straightforwardly
+incorporated in the muffin-tin approximation, intrinsic spin-orbit coupling has
+only been included either for a very specific periodic system, or only close to
+the Dirac point. Here, we introduce general intrinsic and Rashba spin-orbit
+terms in the Hamiltonian for both periodic and finite-size systems. We observe
+a strong band opening over the entire Brillouin zone between the p orbital flat
+band and Dirac cone hosting a pronounced edge state, robust against the effects
+of Rashba spin-orbit coupling.",2104.06912v1
+2007-10-15,Intersubband spin-orbit coupling and spin splitting in symmetric quantum wells,"In semiconductors with inversion asymmetry, spin-orbit coupling gives rise to
+the well-known Dresselhaus and Rashba effects. If one considers quantum wells
+with two or more conduction subbands, an additional, intersubband-induced
+spin-orbit term appears whose strength is comparable to the Rashba coupling,
+and which remains finite for symmetric structures. We show that the conduction
+band spin splitting due to this intersubband spin-orbit coupling term is
+negligible for typical III-V quantum wells.",0710.2866v1
+2009-02-19,Impurity induced spin-orbit coupling in graphene,"We study the effect of impurities in inducing spin-orbit coupling in
+graphene. We show that the sp3 distortion induced by an impurity can lead to a
+large increase in the spin-orbit coupling with a value comparable to the one
+found in diamond and other zinc-blende semiconductors. The spin-flip scattering
+produced by the impurity leads to spin scattering lengths of the order found in
+recent experiments. Our results indicate that the spin-orbit coupling can be
+controlled via the impurity coverage.",0902.3244v1
+2011-10-04,Spin-orbit-coupled dipolar Bose-Einstein condensates,"We propose an experimental scheme to create spin-orbit coupling in spin-3 Cr
+atoms using Raman processes. Employing linear Zeeman effect and optical Stark
+shift, two spin states within the ground electronic manifold are selected,
+which results in a pseudo-spin-1/2 model. We further study the ground state
+structures of a spin-orbit-coupled Cr condensate. We show that, in addition to
+the stripe structures induced by the spin-orbit coupling, the magnetic
+dipole-dipole interaction gives rise to the vortex phase, in which spontaneous
+spin vortex is formed.",1110.0558v3
+2016-01-26,Double-Quantum Spin Vortices in SU(3) Spin-Orbit Coupled Bose Gases,"We show that double-quantum spin vortices, which are characterized by doubly
+quantized circulating spin currents and unmagnetized filled cores, can exist in
+the ground states of SU(3) spin-orbit coupled Bose gases. It is found that the
+SU(3) spin-orbit coupling and spin-exchange interaction play important roles in
+determining the ground-state phase diagram. In the case of effective
+ferromagnetic spin interaction, the SU(3) spin-orbit coupling induces a
+three-fold degeneracy to the magnetized ground state, while in the
+antiferromagnetic spin interaction case, the SU(3) spin-orbit coupling breaks
+the ordinary phase rule of spinor Bose gases, and allows the spontaneous
+emergence of double-quantum spin vortices. This exotic topological defect is in
+stark contrast to the singly quantized spin vortices observed in existing
+experiments, and can be readily observed by the current magnetization-sensitive
+phase-contrast imaging technique.",1601.06935v2
+2021-10-14,Thermalization in a Spin-Orbit coupled Bose gas by enhanced spin Coulomb drag,"An important component of the structure of the atom, the effects of
+spin-orbit coupling are present in many sub-fields of physics. Most of these
+effects are present continuously. We present a detailed study of the dynamics
+of changing the spin-orbit coupling in an ultra-cold Bose gas, coupling the
+motion of the atoms to their spin. We find that the spin-orbit coupling greatly
+increases the damping towards equilibrium. We interpret this damping as spin
+drag, which is enhanced by spin-orbit coupling rate, scaled by a remarkable
+factor of $8.9(6)$~s. We also find that spin-orbit coupling lowers the final
+temperature of the Bose gas after thermalization.",2110.07094v3
+2012-04-10,Spin-current absorption by inhomogeneous spin-orbit coupling,"We investigate the spin-current absorption induced by an inhomogeneous
+spin-orbit coupling due to impurities in metals. We consider the system with
+spin currents driven by the electric field or the spin accumulation. The
+resulting diffusive spin currents, including the gradient of the spin-orbit
+coupling strength, indicate the spin-current absorption at the interface, which
+is exemplified with experimentally relevant setups.",1204.2189v2
+2014-03-19,Spin-orbit coupling effects on spin-dependent inelastic electronic lifetimes in ferromagnets,"For the 3d ferromagnets iron, cobalt and nickel we compute the spin-dependent
+inelastic electronic lifetimes due to carrier-carrier Coulomb interaction
+including spin-orbit coupling. We find that the spin-dependent
+density-of-states at the Fermi energy does not, in general, determine the spin
+dependence of the lifetimes because of the effective spin-flip transitions
+allowed by the spin mixing. The majority and minority electron lifetimes
+computed including spin-orbit coupling for these three 3-d ferromagnets do not
+differ by more than a factor of 2, and agree with experimental results.",1403.4728v1
+2013-06-27,Meron Ground State of Rashba Spin-Orbit-Coupled Dipolar Bosons,"We study the effects of dipolar interactions on a Bose-Einstein condensate
+with synthetically generated Rashba spin-orbit coupling. The dipolar
+interaction we consider includes terms that couple spin and orbital angular
+momentum in a way perfectly congruent with the single-particle Rashba coupling.
+We show that this internal spin-orbit coupling plays a crucial role in the rich
+ground-state phase diagram of the trapped condensate. In particular, we predict
+the emergence of a thermodynamically stable ground state with a meron spin
+configuration.",1306.6610v2
+2007-01-25,Spin-Hall effect and spin-coherent excitations in a strongly confined two-dimensional hole gas,"Based on a rigorous quantum-kinetic approach, spin-charge coupled
+drift-diffusion equations are derived for a strongly confined two-dimensional
+hole gas. An electric field leads to a coupling between the spin and charge
+degrees of freedom. For weak spin-orbit interaction, this coupling gives rise
+to the intrinsic spin-Hall effect. There exists a threshold value of the
+spin-orbit coupling constant that separates spin diffusion from ballistic spin
+transport. In the latter regime, undamped spin-coherent oscillations are
+observed. This result is confirmed by an exact microscopic approach valid in
+the ballistic regime.",0701612v1
+2020-06-05,Intrinsic and extrinsic spin-orbit coupling and spin relaxation in monolayer PtSe$_2$,"Monolayer PtSe$_2$ is a semiconducting transition metal dichalcogenide
+characterized by an indirect band gap, space inversion symmetry, and high
+carrier mobility. Strong intrinsic spin-orbit coupling and the possibility to
+induce extrinsic spin-orbit fields by gating make PtSe$_2$ attractive for
+fundamental spin transport studies as well as for potential spintronics
+applications. We perform a systematic theoretical study of the spin-orbit
+coupling and spin relaxation in this material. Specifically, we employ first
+principles methods to obtain the basic orbital and spin-orbital properties of
+PtSe$_2$, also in the presence of an external transverse electric field. We
+calculate the spin mixing parameters $b^2$ and the spin-orbit fields $\Omega$
+for the Bloch states of electrons and holes. This information allows us to
+predict the spin lifetimes due to the Elliott-Yafet and D'yakonov-Perel
+mechanisms. We find that $b^2$ is rather large, on the order of $10^{-2}$ and
+$10^{-1}$, while $\Omega$ varies strongly with doping, being about $10^{3} -
+10^{4}$\,ns$^{-1}$ for %typical Fermi levels in the interval $(10-100)$ meV,
+carrier density in the interval $10^{13}-10^{14}$\,cm$^{-2}$ at the electric
+field of 1 V/nm. We estimate the spin lifetimes to be on the picosecond level.",2006.03384v1
+2016-11-06,Effective magnetic interactions in spin-orbit coupled $d^4$ Mott insulators,"Transition metal compounds with the $(t_{2g})^4$ electronic configuration are
+expected to be nonmagnetic atomic singlets both in the weakly interacting
+regime due to spin-orbit coupling, as well as in the Coulomb dominated regime
+with oppositely aligned $L=1$ and $S=1$ angular momenta. However, starting with
+the full multi-orbital electronic Hamiltonian, we show the low energy effective
+magnetic Hamiltonian contains isotropic superexchange spin interactions but
+anisotropic orbital interactions. By tuning the ratio of superexchange to
+spin-orbit coupling $J_\mathrm{SE}/\lambda$, we obtain a phase transition from
+nonmagnetic atomic singlets to novel magnetic phases depending on the strength
+of Hund's coupling, the crystal structure and the number of active orbitals.
+Spin-orbit coupling plays a non-trivial role in generating a triplon condensate
+of weakly interacting excitations at antiferromagnetic ordering vector $\vec
+k=\vec \pi$, regardless of whether the local spin interactions are
+ferromagnetic or antiferromagnetic. In the large $J_\mathrm{SE} / \lambda$
+regime, the localized spin and orbital moments produce anisotropic orbital
+interactions that are frustrated or constrained even in the absence of
+geometric frustration. Orbital frustration leads to frustration in the spin
+channel opening up the possibility of spin-orbital liquids with both spin and
+orbital entanglement.",1611.01840v1
+2021-06-04,Efficient conversion of orbital Hall current to spin current for spin-orbit torque switching,"Spin Hall effect, an electric generation of spin current, allows for
+efficient control of magnetization. Recent theory revealed that orbital Hall
+effect creates orbital current, which can be much larger than spin Hall-induced
+spin current. However, orbital current cannot directly exert a torque on a
+ferromagnet, requiring a conversion process from orbital current to spin
+current. Here, we report two effective methods of the conversion through
+spin-orbit coupling engineering, which allows us to unambiguously demonstrate
+orbital-current-induced spin torque, or orbital Hall torque. We find that
+orbital Hall torque is greatly enhanced by introducing either a rare-earth
+ferromagnet Gd or a Pt interfacial layer with strong spin-orbit coupling in
+Cr/ferromagnet structures, indicating that the orbital current generated in Cr
+is efficiently converted into spin current in the Gd or Pt layer. Furthermore,
+we show that the orbital Hall torque can facilitate the reduction of switching
+current of perpendicular magnetization in spin-orbit-torque-based spintronic
+devices.",2106.02286v2
+2014-12-17,Energy spectra of two interacting fermions with spin-orbit coupling in a harmonic trap,"We explore the two-body spectra of spin-$1/2$ fermions in isotropic harmonic
+traps with external spin-orbit potentials and short range two-body
+interactions. Using a truncated basis of total angular momentum eigenstates,
+non-perturbative results are presented for experimentally realistic forms of
+the spin-orbit coupling: a pure Rashba coupling, Rashba and Dresselhaus
+couplings in equal parts, and a Weyl-type coupling. The technique is easily
+adapted to bosonic systems and other forms of spin-orbit coupling.",1412.5634v2
+2017-09-20,Superfluid transition temperature of spin-orbit and Rabi coupled fermions with tunable interactions,"We obtain the superfluid transition temperature of equal Rashba-Dresselhaus
+spin-orbit and Rabi coupled Fermi superfluids, from the
+Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) regimes in
+three dimensions. Spin-orbit coupling enhances the critical temperature in the
+BEC limit, and can convert a first order phase transition in the presence of
+Rabi coupling into second order, as a function of the Rabi coupling for fixed
+interactions. We derive the Ginzburg-Landau equation to sixth power in the
+superfluid order parameter to describe both first and second order transitions
+as a function of spin-orbit and Rabi couplings.",1709.07042v1
+2012-12-03,Normal state properties of spin-orbit coupled Fermi gases in the upper branch of energy spectrum,"We investigate normal state properties of spin-orbit coupled Fermi gases with
+repulsive s-wave interaction, in the absence of molecule formation, i.e., in
+the so-called ""upper branch"". Within the framework of random phase
+approximation, we derive analytical expressions for the quasi-particle lifetime
+$\tau_s$, the effective mass $m_s^*$, and the Green's function renormalization
+factor $Z_s$ in the presence of Rashba spin-orbit coupling. In contrast to
+spin-orbit coupled electron gas with Coulomb interaction, we show that the
+modifications are dependent on the Rashba band index s, and occur in the first
+order of the spin-orbit coupling strength. We also calculate experimental
+observable such as spectral weight, density of state and specific heat, which
+exhibit significant differences from their counterparts without spin-orbit
+coupling. We expect our microscopic calculations of these Fermi liquid
+parameters would have the immediate applications to the spin-orbit coupled
+Fermi gases in the upper branch of the energy spectrum.",1212.0420v5
+2016-10-07,The Role of Interaction in the Pairing of Two Spin-orbit Coupled Fermions,"We investigate the role of a repulsive s-wave interaction in the two-body
+problem in the presence of spin orbit couplings, motivated by current interests
+in exploring exotic superfluid phases in spin-orbit coupled Fermi gases. For
+weak spin orbit coupling where the density of states is not significantly
+altered, we analytically show that the high-energy states become more important
+in determining the binding energy when the interaction strength decreases.
+Consequently, tuning the interaction gives rise to a rich ground state
+behavior, including a zigzag of the ground state momentum or inducing
+transitions among the meta-stable states. By exactly solving the two-body
+problem for a spin-orbit coupled Fermi mixture, we demonstrate that our
+analysis can also apply to the case when the density of states is significantly
+modified by the spin-orbit coupling. Our findings pave the way for
+understanding and controlling the paring of fermions in the presence of spin
+orbit couplings.",1610.02927v2
+2018-07-17,Effects of spin-orbit coupling on the optical response of a material,"We investigate the effects of spin-orbit coupling on the optical response of
+materials. In particular, we study the effects of the commutator between the
+spin-orbit coupling part of the potential and the position operator on the
+optical matrix elements. Using a formalism that separates a fullyrelativistic
+Kleinman-Bylander pseudopotential into the scalar-relativistic and
+spin-orbit-coupling parts, we calculate the contribution of the commutator
+arising from spin-orbit coupling to the squared optical matrix elements of
+isolated atoms, monolayer transition metal dichalcogenides, and topological
+insulators. In the case of isolated atoms from H ($Z = 1$) to Bi ($Z = 83$),
+the contribution of spin-orbit coupling to the squared matrix elements can be
+as large as 14 %. On the other hand, in the cases of monolayer transition metal
+dichalcogenides and topological insulators, we find that this contribution is
+less than 1 % and that it is sufficient to calculate the optical matrix
+elements and subsequent physical quantities without considering the commutator
+arising from spin-orbit coupling.",1807.06669v1
+2011-10-31,Spin-Orbit Coupled Quantum Gases,"In this review we will discuss the experimental and theoretical progresses in
+studying spin-orbit coupled degenerate atomic gases during the last two years.
+We shall first review a series of pioneering experiments in generating
+synthetic gauge potentials and spin-orbit coupling in atomic gases by
+engineering atom-light interaction. Realization of spin-orbit coupled quantum
+gases opens a new avenue in cold atom physics, and also brings out a lot of new
+physical problems. In particular, the interplay between spin-orbit coupling and
+inter-atomic interaction leads to many intriguing phenomena. Here, by reviewing
+recent theoretical studies of both interacting bosons and fermions with
+isotropic Rashba spin-orbit coupling, the key message delivered here is that
+spin-orbit coupling can enhance the interaction effects, and make the
+interaction effects much more dramatic even in the weakly interacting regime.",1110.6798v1
+2010-02-02,Spin-resolved scattering through spin-orbit nanostructures in graphene,"We address the problem of spin-resolved scattering through spin-orbit
+nanostructures in graphene, i.e., regions of inhomogeneous spin-orbit coupling
+on the nanometer scale. We discuss the phenomenon of spin-double refraction and
+its consequences on the spin polarization. Specifically, we study the
+transmission properties of a single and a double interface between a normal
+region and a region with finite spin-orbit coupling, and analyze the
+polarization properties of these systems. Moreover, for the case of a single
+interface, we determine the spectrum of edge states localized at the boundary
+between the two regions and study their properties.",1002.0441v2
+2014-09-19,Angular dependence of spin-orbit spin transfer torques,"In ferromagnet/heavy metal bilayers, an in-plane current gives rise to
+spin-orbit spin transfer torque which is usually decomposed into field-like and
+damping-like torques. For two-dimensional free-electron and tight-binding
+models with Rashba spin-orbit coupling, the field-like torque acquires
+nontrivial dependence on the magnetization direction when the Rashba spin-orbit
+coupling becomes comparable to the exchange interaction. This nontrivial
+angular dependence of the field-like torque is related to the Fermi surface
+distortion, determined by the ratio of the Rashba spin-orbit coupling to the
+exchange interaction. On the other hand, the damping-like torque acquires
+nontrivial angular dependence when the Rashba spin-orbit coupling is comparable
+to or stronger than the exchange interaction. It is related to the combined
+effects of the Fermi surface distortion and the Fermi sea contribution. The
+angular dependence is consistent with experimental observations and can be
+important to understand magnetization dynamics induced by spin-orbit spin
+transfer torques",1409.5600v1
+2006-08-18,Electric Dipole Spin Resonance for Heavy Holes in Quantum Dots,"We propose and analyze a new method for manipulation of a heavy hole spin in
+a quantum dot. Due to spin-orbit coupling between states with different orbital
+momenta and opposite spin orientations, an applied rf electric field induces
+transitions between spin-up and spin-down states. This scheme can be used for
+detection of heavy-hole spin resonance signals, for the control of the spin
+dynamics in two-dimensional systems, and for determining important parameters
+of heavy-holes such as the effective $g$-factor, mass, spin-orbit coupling
+constants, spin relaxation and decoherence times.",0608410v1
+2007-05-25,Interplay of the Rashba and Dresselhaus spin-orbit coupling in the optical spin susceptibility of 2D electron systems,"We present calculations of the frequency-dependent spin susceptibility tensor
+of a two-dimensional electron gas with competing Rashba and Dresselhaus
+spin-orbit interaction. It is shown that the interplay between both types of
+spin-orbit coupling gives rise to an anisotropic spectral behavior of the spin
+density response function which is significantly different from that of
+vanishing Rashba or Dresselhaus case. Strong resonances are developed in the
+spin susceptibility as a consequence of the angular anisotropy of the energy
+spin-splitting. This characteristic optical modulable response may be useful to
+experimentally probe spin accumulation and spin density currents in such
+systems.",0705.3849v1
+2008-07-23,Dynamics of coupled spins in quantum dots with strong spin-orbit interaction,"We investigated the time dependence of two-electron spin states in a double
+quantum dot fabricated in an InAs nanowire. In this system, spin-orbit
+interaction has substantial influence on the spin states of confined electrons.
+Pumping single electrons through a Pauli spin-blockade configuration allowed to
+probe the dynamics of the two coupled spins via their influence on the pumped
+current. We observed spin-relaxation with a magnetic field dependence different
+from GaAs dots, which can be explained by spin-orbit interaction. Oscillations
+were detected for times shorter than the relaxation time, which we attribute to
+coherent evolution of the spin states.",0807.3654v1
+2010-12-21,Spin dephasing and pumping in graphene due to random spin-orbit interaction,"We consider spin effects related to the random spin-orbit interaction in
+graphene. Such a random interaction can result from the presence of ripples
+and/or other inhomogeneities at the graphene surface. We show that the random
+spin-orbit interaction generally reduces the spin dephasing (relaxation) time,
+even if the interaction vanishes on average. Moreover, the random spin-orbit
+coupling also allows for spin manipulation with an external electric field. Due
+to the spin-flip interband as well as intraband optical transitions, the spin
+density can be effectively generated by periodic electric field in a relatively
+broad range of frequencies.",1012.4757v1
+2015-05-11,Current-induced spin polarization and spin-orbit torque in graphene,"Using the Green function formalism we calculate a current-induced spin
+polarization of weakly magnetized graphene with Rashba spin-orbit interaction.
+In a general case, all components of the current-induced spin polarization are
+nonzero, contrary to the nonmagnetic limit, where the only nonvanishing
+component of spin polarization is that in the graphene plane and normal to
+electric field. When the induced spin polarization is exchange-coupled to the
+magnetization, it exerts a spin-orbit torque on the latter. Using the Green
+function method we have derived some analytical formulas for the spin
+polarization and also determined the corresponding spin-orbit torque
+components.",1505.02530v2
+2012-04-25,Spin freezing by Anderson localization in one-dimensional semiconductors,"One-dimensional quantum wires are considered as prospective elements for spin
+transport and manipulation in spintronics. We study spin dynamics in
+semiconductor GaAs-like nanowires with disorder and spin-orbit interaction by
+using a rotation in the spin subspace gauging away the spin-orbit field. If the
+disorder is sufficiently strong, the spin density after a relatively short
+relaxation time reaches a plateau. This effect is a manifestation of the
+Anderson localization and depends in a universal way on the disorder and the
+spin-orbit coupling strength. As a result, at a given disorder, semiconductor
+nanowires can permit a long-term spin polarization tunable with the spin-orbit
+interactions.",1204.5597v1
+2024-01-17,Spin Orbit Torque on a Curved Surface,"We provide a general formulation of the spin-orbit coupling on a 2D curved
+surface. Considering the wide applicability of spin-orbit effect in
+spinor-based condensed matter physics, a general spin-orbit formulation could
+aid the study of spintronics, Dirac graphene, topological systems, and quantum
+information on curved surfaces. Particular attention is then devoted to the
+development of an important spin-orbit quantity known as the spin-orbit torque.
+As devices trend smaller in dimension, the physics of local geometries on
+spin-orbit torque, hence spin and magnetic dynamics shall not be neglected. We
+derived the general expression of a spin-orbit anisotropy field for the curved
+surfaces and provided explicit solutions in the special contexts of the
+spherical, cylindrical and flat coordinates. Our expressions allow spin-orbit
+anisotropy fields and hence spin-orbit torque to be computed over the entire
+surfaces of devices of any geometry.",2401.08966v1
+2014-06-10,"Weak Localization, Spin Relaxation, and Spin-Diffusion: The Crossover Between Weak and Strong Rashba Coupling Limits","Disorder scattering and spin-orbit coupling are together responsible for the
+diffusion and relaxation of spin-density in time-reversal invariant systems. We
+study spin-relaxation and diffusion in a two-dimensional electron gas with
+Rashba spin-orbit coupling and spin-independent disorder, focusing on the role
+of Rashba spin-orbit coupling in transport. Spin-orbit coupling contributes to
+spin relaxation, transforming the quantum interference contribution to
+conductivity from a negative weak localization (WL) correction to a positive
+weak anti-localization (WAL) correction. The importance of spin channel mixing
+in transport is largest in the regime where the Bloch state energy uncertainty
+$\hbar/\tau$ and the Rashba spin-orbit splitting $\Delta_\mathrm{SO}$ are
+comparable. We find that as a consequence of this spin channel mixing, the
+WL-WAL crossover is non-monotonic in this intermediate regime, and use our
+results to address recent experimental studies of transport at two-dimensional
+oxide interfaces.",1406.2715v2
+2011-04-04,Topological phase transitions between chiral and helical spin textures in a lattice with spin-orbit coupling and a magnetic field,"We consider the combined effects of large spin-orbit couplings and a
+perpendicular magnetic field in a 2D honeycomb fermionic lattice. This system
+provides an elegant setup to generate versatile spin textures propagating along
+the edge of a sample. The spin-orbit coupling is shown to induce topological
+phase transitions between a helical quantum spin Hall phase and a chiral
+spin-imbalanced quantum Hall state. Besides, we find that the spin orientation
+of a single topological edge state can be tuned by a Rashba spin-orbit
+coupling, opening an interesting route towards quantum spin manipulation. We
+discuss the possible realization of our results using cold atoms trapped in
+optical lattices, where large synthetic magnetic fields and spin-orbit
+couplings can be engineered and finely tuned. In particular, this system would
+lead to the observation of a time-reversal-symmetry-broken quantum spin Hall
+phase.",1104.0643v2
+2005-02-14,Orbitronics: the Intrinsic Orbital Hall Effect in p-Doped Silicon,"The spin Hall effect depends crucially on the intrinsic spin-orbit coupling
+of the energy band. Because of the smaller spin-orbit coupling in silicon, the
+spin Hall effect is expected to be much reduced. We show that the electric
+field in p-doped silicon can induce a dissipationless orbital current in a
+fashion reminiscent of the spin Hall effect. The vertex correction due to
+impurity scattering vanishes and the effect is therefore robust against
+disorder. The orbital Hall effect can lead to the accumulation of local orbital
+momentum at the edge of the sample, and can be detected by the Kerr effect.",0502345v1
+2018-03-09,Spin-vorticity coupling in viscous electron fluids,"We consider spin-vorticity coupling - the generation of spin polarization by
+vorticity - in viscous two-dimensional electron systems with spin-orbit
+coupling. We first derive hydrodynamic equations for spin and momentum
+densities in which their mutual coupling is determined by the rotational
+viscosity. We then calculate the rotational viscosity microscopically in the
+limits of weak and strong spin-orbit coupling. We provide estimates that show
+that the spin-orbit coupling achieved in recent experiments is strong enough
+for the spin-vorticity coupling to be observed. On the one hand, this coupling
+provides a way to image viscous electron flows by imaging spin densities. On
+the other hand, we show that the spin polarization generated by spin-vorticity
+coupling in the hydrodynamic regime can, in principle, be much larger than that
+generated, e.g. by the spin Hall effect, in the diffusive regime.",1803.03549v1
+2013-10-29,Self-Quenching of Nuclear Spin Dynamics in Central Spin Problem,"We consider, in the framework of the central spin $s=1/2$ model, driven
+dynamics of two electrons in a double quantum dot subject to hyperfine
+interaction with nuclear spins and spin-orbit coupling. The nuclear subsystem
+dynamically evolves in response to Landau-Zener singlet-triplet transitions of
+the electronic subsystem controlled by external gate voltages. Without noise
+and spin-orbit coupling, subsequent Landau-Zener transitions die out after
+about $10^4$ sweeps, the system self-quenches, and nuclear spins reach one of
+the numerous glassy dark states. We present an analytical model that captures
+this phenomenon. We also account for the multi-nuclear-specie content of the
+dots and numerically determine the evolution of around $10^7$ nuclear spins in
+up to $2\times10^5$ Landau-Zener transitions. Without spin-orbit coupling,
+self-quenching is robust and sets in for arbitrary ratios of the nuclear spin
+precession times and the waiting time between Landau-Zener sweeps as well as
+under moderate noise. In presence of spin-orbit coupling of a moderate
+magnitude, and when the waiting time is in resonance with the precession time
+of one of the nuclear species, the dynamical evolution of nuclear polarization
+results in stroboscopic screening of spin-orbit coupling. However, small
+deviations from the resonance or strong spin-orbit coupling destroy this
+screening. We suggest that the success of the feedback loop technique for
+building nuclear gradients is based on the effect of spin-orbit coupling.",1310.7847v1
+2015-11-11,Spin Swapping Transport and Torques in Ultrathin Magnetic Bilayers,"Planar spin transport in disordered ultrathin magnetic bilayers comprising a
+ferromagnet and a normal metal (typically used for spin pumping, spin Seebeck
+and spin-orbit torque experiments) is investigated theoretically. Using a
+tight-binding model that treats extrinsic spin Hall effect, spin swapping and
+spin relaxation on equal footing, we show that the nature of spin-orbit coupled
+transport dramatically depends on ratio between the layers thickness $d$ and
+the mean free path $\lambda$. While spin Hall effect dominates in the diffusive
+limit ($d\gg\lambda$), spin swapping dominates in Knudsen regime
+($d\lesssim\lambda$). A remarkable consequence is that the symmetry of the
+spin-orbit torque exerted on the ferromagnet is entirely different in these two
+regimes.",1511.03454v1
+2007-08-20,Manipulating the spin texture in spin-orbit superlattice by terahertz radiation,"The spin texture in a gate-controlled superlattice with Rashba spin-orbit
+coupling is studied in the presence of external terahertz radiation causing the
+superlattice miniband transitions. It is shown that the local distribution of
+spin density can be flipped by tuning the radiation intensity, allowing the
+controlled coupling of spins and photons with different polarizations.",0708.2595v2
+2012-01-20,Josephson dynamics of a spin-orbit coupled Bose-Einstein condensate in a double well potential,"We investigate the quantum dynamics of an experimentally realized spin-orbit
+coupled Bose-Einstein condensate in a double well potential. The spin-orbit
+coupling can significantly enhance the atomic inter-well tunneling. We find the
+coexistence of internal and external Josephson effects in the system, which are
+moreover inherently coupled in a complicated form even in the absence of
+interatomic interactions. Moreover, we show that the spin-dependent tunneling
+between two wells can induce a net atomic spin current referred as spin
+Josephson effects. Such novel spin Josephson effects can be observable for
+realistically experimental conditions.",1201.4306v1
+2014-08-27,Spin-orbit Coupling and Multiple Phases in Spin-triplet Superconductor Sr$_2$RuO$_4$,"We study the spin-orbit coupling in spin-triplet Cooper pairs and clarify
+multiple superconducting (SC) phases in Sr$_2$RuO$_4$. Based on the analysis of
+the three-orbital Hubbard model with atomic LS coupling, we show some selection
+rules of the spin-orbit coupling in Cooper pairs. The spin-orbit coupling is
+small when the two-dimensional $\gamma$-band is the main cause of the
+superconductivity, although the LS coupling is much larger than the SC gap.
+Considering this case, we investigate multiple SC transitions in the magnetic
+fields for both H // [001] and H // [100] using the Ginzburg-Landau theory and
+the quasi-classical theory. Rich phase diagrams are obtained because the spin
+degree of freedom in Cooper pairs is not quenched by the spin-orbit coupling.
+Experimental indications for the multiple phases in Sr$_2$RuO$_4$ are
+discussed.",1408.6353v1
+2009-08-20,Theory of anisotropic exchange in laterally coupled quantum dots,"The effects of spin-orbit coupling on the two-electron spectra in lateral
+coupled quantum dots are investigated analytically and numerically. It is
+demonstrated that in the absence of magnetic field the exchange interaction is
+practically unaffected by spin-orbit coupling, for any interdot coupling,
+boosting prospects for spin-based quantum computing. The anisotropic exchange
+appears at finite magnetic fields. A numerically accurate effective spin
+Hamiltonian for modeling spin-orbit-induced two-electron spin dynamics in the
+presence of magnetic field is proposed.",0908.2961v2
+2013-10-30,Spin-orbital state induced by strong spin-orbit coupling,"To clarify a crucial role of a spin-orbit coupling in the emergence of novel
+spin-orbital states in $5d$-electron compounds such as Sr$_{2}$IrO$_{4}$, we
+investigate ground state properties of a $t_{\rm 2g}$-orbital Hubbard model on
+a square lattice by Lanczos diagonalization. In the absence of the spin-orbit
+coupling, the ground state is spin singlet. When the spin-orbit coupling is
+strong enough, the ground state turns into a weak ferromagnetic state. The weak
+ferromagnetic state is a singlet state in terms of an effective total angular
+momentum. Regarding the orbital state, we find the so-called complex orbital
+state, in which real $xy$, $yz$, and $zx$ orbital states are mixed with complex
+coefficients.",1310.8016v1
+2015-12-05,Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling: II. RPA response functions and collective modes,"The spin and density response functions in the random phase approximation
+(RPA) are derived by linearizing the kinetic equation including a magnetic
+field, the spin-orbit coupling, and mean fields with respect to an external
+electric field. Different polarization functions appear describing various
+precession motions showing Rabi satellites due to an effective Zeeman field.
+The latter turns out to consist of the mean-field magnetization, the magnetic
+field, and the spin-orbit vector. The collective modes for charged and neutral
+systems are derived and a threefold splitting of the spin waves dependent on
+the polarization and spin-orbit coupling is shown. The dielectric function
+including spin-orbit coupling, polarization and magnetic fields is presented
+analytically for long wave lengths and in the static limit. The dynamical
+screening length as well as the long-wavelength dielectric function shows an
+instability in charge modes, which are interpreted as spin segregation and
+domain formation. The spin response describes a crossover from damped
+oscillatory behavior to exponentially damped behavior dependent on the
+polarization and collision frequency. The magnetic field causes ellipsoidal
+trajectories of the spin response to an external electric field and the
+spin-orbit coupling causes a rotation of the spin axes. The spin-dephasing
+times are extracted and discussed in dependence on the polarization, magnetic
+field, spin-orbit coupling and single-particle relaxation times.",1512.01661v1
+2013-07-09,Multi-Orbital Superconductivity in SrTiO3 /LaAlO3 Interface and SrTiO3 Surface,"We investigate the superconductivity in two-dimensional electron systems
+formed in SrTiO3 nanostructures. Our the- oretical analysis is based on the
+three-orbital model, which takes into account t2g orbitals of Ti ions. Because
+of the interfacial breaking of mirror symmetry, a Rashba-type antisymmetric
+spin-orbit coupling arises from the cooperation of intersite and interorbital
+hybridyzation and atomic LS coupling. This model shows a characteristic spin
+texture and carrier density dependence of Rashba spin-orbit coupling through
+the orbital degree of freedom. Superconductivity is mainly caused by heavy
+quasiparticles consisting of dyz and dzx orbitals at high carrier densities. We
+find that the Rashba spin-orbit coupling stabilizes a quasi-one-dimensional
+superconducting phase caused by one of the dyz or dzx orbitals at high magnetic
+fields along interfaces. This quasi-one-dimensional superconducting phase is
+protected against para- magnetic depairing effects by the Rashba spin-orbit
+coupling and realizes a large upper critical field Hc2 beyond the
+Pauli-Clogston-Chandrasekhar limit. This finding is consistent with an
+extraordinarily large upper critical field observed in SrTiO3 /LaAlO3
+interfaces and its carrier density dependence. The possible coexistence of
+superconductivity and fer- romagnetism in SrTiO3 /LaAlO3 interfaces may also be
+attributed to this quasi-one-dimensional superconducting phase.",1307.2363v1
+2020-09-15,Spin-orbital polarization of Majorana edge states in oxides nanowires,"We investigate a paradigmatic case of topological superconductivity in a
+one-dimensional nanowire with $d-$orbitals and a strong interplay of
+spin-orbital degrees of freedom due to the competition of orbital Rashba
+interaction, atomic spin-orbit coupling, and structural distortions. We
+demonstrate that the resulting electronic structure exhibits an orbital
+dependent magnetic anisotropy which affects the topological phase diagram and
+the character of the Majorana bound states (MBSs). The inspection of the
+electronic component of the MBSs reveals that the spin-orbital polarization
+generally occurs along the direction of the applied Zeeeman magnetic field, and
+transverse to the magnetic and orbital Rashba fields. The competition of
+symmetric and antisymmetric spin-orbit coupling remarkably leads to a
+misalignment of the spin and orbital moments transverse to the orbital Rashba
+fields, whose manifestation is essentially orbital dependent. The behavior of
+the spin-orbital polarization along the applied Zeeman field reflects the
+presence of multiple Fermi points with inequivalent orbital character in the
+normal state. Additionally, the response to variation of the electronic
+parameters related with the degree of spin-orbital entanglement leads to
+distinctive evolution of the spin-orbital polarization of the MBSs. These
+findings unveil novel paths to single-out hallmarks relevant for the
+experimental detection of MBSs.",2009.06956v1
+2021-03-30,Numerical analysis of the spin-orbit coupling parameters in III-V quantum wells using 8-band Kane model and finite-difference method,"By means the envelope function approximation, 8-band Kane model and a
+finite-difference scheme with the coordinate space discretization, we
+numerically performed calculations of the spin-orbit coupling parameters for 2D
+electron gas confined in both symmetric and asymmetric [0 0 1] quantum wells
+based on zinc-blende III-V semiconductors. Influence of the quantum well band
+parameters and width as well as the magnitude of the external electric field
+applied along the growth direction on the Dresselhaus and Rashba spin-orbit
+coupling parameters is investigated. It has been found that in the symmetric
+InGaAs/GaAs quantum wells linear-in-momentum spin-orbit coupling disappears for
+the third electron subband at certain values of well width and the indium
+content. It is also shown that in asymmetric InGaAs/GaAs structures the
+spin-orbit coupling parameters can be equal at a certain electric field that is
+the condition for the realization of the SU(2) spin symmetry and formation of
+persistent spin helices. Besides, we calculated the spin-orbit coupling in the
+persistent spin helix regime as a function of the well width, indium content
+and external field. The proposed approach for the calculation of the spin-orbit
+coupling parameters can be applied to other 2D structures with the spin-orbit
+coupling.",2103.16721v1
+2011-02-11,Chiral spin states in polarized kagome spin systems with spin-orbit coupling,"We study quantum spin systems with a proper combination of geometric
+frustration, spin-orbit coupling and ferromagnetism. We argue that such a
+system is likely to be in a chiral spin state, a fractional quantum Hall (FQH)
+state for bosonic spin degrees of freedom. The energy scale of the bosonic FQH
+state is of the same order as the spin-orbit coupling and ferromagnetism ---
+overall much higher than the energy scale of FQH states in semiconductors.",1102.2406v1
+2013-04-30,Can electrostatic field lift spin degeneracy?,"There are two well known mechanisms which lead to lifting of energy spin
+degeneracy of single electron systems - magnetic field and spin-orbit coupling.
+We investigate the possibility for existence of a third mechanism in which
+electrostatic field can lead to lifting of spin-degeneracy directly without the
+mediation of spin-orbit coupling. A novel argument is provided for the need of
+spin-orbit coupling different from the usual relativistic considerations. It is
+shown that due to preserved translational invariance spin splitting purely by
+electrostatic field is not possible for Bloch states. A possible lifting of
+spin degeneracy by electrostatic field characterized by broken inversion and
+translational invariance is considered.",1304.7968v2
+2011-09-22,Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators,"We show how the general and basic asymmetry between two fundamental degrees
+of freedom present in strongly correlated oxides, spin and orbital, has very
+profound repercussions on the elementary spin and orbital excitations. Whereas
+the magnons remain largely unaffected, orbitons become inherently coupled with
+spin fluctuations in spin-orbital models with antiferromagnetic and
+ferroorbital ordered ground states. The composite orbiton-magnon modes that
+emerge fractionalize again in one dimension, giving rise to spin-orbital
+separation in the peculiar regime where spinons are faster than orbitons.",1109.4745v1
+2012-11-05,Tailoring spin-orbit torque in diluted magnetic semiconductors,"We study the spin orbit torque arising from an intrinsic linear Dresselhaus
+spin-orbit coupling in a single layer III-V diluted magnetic semiconductor. We
+investigate the transport properties and spin torque using the linear response
+theory and we report here : (1) a strong correlation exists between the angular
+dependence of the torque and the anisotropy of the Fermi surface; (2) the spin
+orbit torque depends nonlinearly on the exchange coupling. Our findings suggest
+the possibility to tailor the spin orbit torque magnitude and angular
+dependence by structural design.",1211.0867v2
+2015-06-02,Spin-orbit coupling rule in bound fermions systems,"Spin-orbit coupling characterizes quantum systems such as atoms, nuclei,
+hypernuclei, quarkonia, etc., and is essential for understanding their
+spectroscopic properties. Depending on the system, the effect of spin-orbit
+coupling on shell structure is large in nuclei, small in quarkonia,
+perturbative in atoms. In the standard non-relativistic reduction of the
+single-particle Dirac equation, we derive a universal rule for the relative
+magnitude of the spin-orbit effect that applies to very different quantum
+systems, regardless of whether the spin-orbit coupling originates from the
+strong or electromagnetic interaction. It is shown that in nuclei the near
+equality of the mass of the nucleon and the difference between the large
+repulsive and attractive potentials explains the fact that spin-orbit
+splittings are comparable to the energy spacing between major shells. For a
+specific ratio between the particle mass and the effective potential whose
+gradient determines the spin-orbit force, we predict the occurrence of giant
+spin-orbit energy splittings that dominate the single-particle excitation
+spectrum.",1506.00911v2
+2006-06-07,An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System,"Spin-orbit coupled systems generally break the spin rotation symmetry.
+However, for a model with equal Rashba and Dresselhauss coupling constant (the
+ReD model), and for the $[110]$ Dresselhauss model, a new type of SU(2) spin
+rotation symmetry is discovered. This symmetry is robust against
+spin-independent disorder and interactions, and is generated by operators whose
+wavevector depends on the coupling strength. It renders the spin lifetime
+infinite at this wavevector, giving rise to a Persistent Spin Helix (PSH). We
+obtain the spin fluctuation dynamics at, and away, from the symmetry point, and
+suggest experiments to observe the PSH.",0606196v1
+2010-08-09,Gate-dependent spin-orbit coupling in multi-electron carbon nanotubes,"Understanding how the orbital motion of electrons is coupled to the spin
+degree of freedom in nanoscale systems is central for applications in
+spin-based electronics and quantum computation. We demonstrate this coupling of
+spin and orbit in a carbon nanotube quantum dot in the general multi-electron
+regime in presence of finite disorder. Further, we find a strong systematic
+dependence of the spin-orbit coupling on the electron occupation of the quantum
+dot. This dependence, which even includes a sign change is not demonstrated in
+any other system and follows from the curvature-induced spin-orbit split
+Dirac-spectrum of the underlying graphene lattice. Our findings unambiguously
+show that the spin-orbit coupling is a general property of nanotube quantum
+dots which provide a unique platform for the study of spin-orbit effects and
+their applications.",1008.1600v2
+2006-03-23,Intense terahertz laser fields on a quantum dot with Rashba spin-orbit coupling,"We investigate the effects of the intense terahertz laser field and the
+spin-orbit coupling on single electron spin in a quantum dot. The laser field
+and the spin-orbit coupling can strongly affect the electron density of states
+and can excite a magnetic moment.
+  The direction of the magnetic moment depends on the symmetries of the system,
+and its amplitude can be tuned by the strength and frequency of the laser field
+as well as the spin-orbit coupling.",0603614v2
+2008-10-30,Berry Phase in a Single Quantum Dot with Spin-Orbit Interaction,"Berry phase in a single quantum dot with Rashba spin-orbit coupling is
+investigated theoretically. Berry phases as functions of magnetic field
+strength, dot size, spin-orbit coupling and photon-spin coupling constants are
+evaluated. It is shown that the Berry phase will alter dramatically from 0 to
+$2\pi$ as the magnetic field strength increases. The threshold of magnetic
+field depends on the dot size and the spin-orbit coupling constant.",0810.5405v1
+2011-06-28,Phase separation in a polarized Fermi gas with spin-orbit coupling,"We study the phase separation of a spin polarized Fermi gas with spin-orbit
+coupling near a wide Feshbach resonance. As a result of the competition between
+spin-orbit coupling and population imbalance, the phase diagram for a uniform
+gas develops a rich structure of phase separation involving gapless superfluid
+states which are topologically non-trivial. We find that these novel gapless
+phases can be stabilized by intermediate spin-orbit coupling strengths. We then
+demonstrate the phase separation induced by an external trapping potential and
+discuss the optimal parameter region for the experimental observation of the
+gapless superfluid phases.",1106.5667v2
+2013-12-09,The Pairing of Spin-orbit Coupled Fermi Gas in Optical Lattice,"We investigate Rashba spin-orbit coupled Fermi gases in square optical
+lattice by using the determinant quantum Monte Carlo (DQMC) simulations which
+is free of the sign-problem. We show that the Berezinskii-Kosterlitz-Thoules
+phase transition temperature is firstly enhanced and then suppressed by
+spin-orbit coupling in the strong attraction region. In the intermediate
+attraction region, spin-orbit coupling always suppresses the transition
+temperature. We also show that the spin susceptibility becomes anisotropic and
+retains finite values at zero temperature.",1312.2292v1
+2020-12-27,Microwave spectroscopy of spin-orbit coupled states: energy detuning versus interdot coupling modulation,"We study the AC field induced current peaks of a spin blockaded double
+quantum dot with spin-orbit interaction. The AC field modulates either the
+interdot tunnel coupling or the energy detuning, and we choose the AC field
+frequency range to induce two singlet-triplet transitions giving rise to two
+current peaks. We show that for a large detuning the two current peaks can be
+significantly stronger when the AC field modulates the tunnel coupling, thus
+making the detection of the spin-orbit gap more efficient. We also demonstrate
+the importance of the time dependence of the spin-orbit interaction.",2012.13914v1
+2020-10-05,Detection of the Orbital Hall Effect by the Orbital-Spin Conversion,"The intrinsic orbital Hall effect (OHE), the orbital counterpart of the spin
+Hall effect, was predicted and studied theoretically for more than one decade,
+yet to be observed in experiments. Here we propose a strategy to convert the
+orbital current in OHE to the spin current via the spin-orbit coupling from the
+contact. Furthermore, we find that OHE can induce large nonreciprocal
+magnetoresistance when employing magnetic contact. Both the generated spin
+current and the orbital Hall magnetoresistance can be applied to probe the OHE
+in experiments and design orbitronic devices.",2010.01970v1
+2018-12-19,Manifestations of spin-orbit coupling in a cuprate superconductor,"Exciting new work on Bi2212 shows the presence of non-trivial spin-orbit
+coupling effects as seen in spin resolved ARPES data [Gotlieb et al., Science,
+362, 1271-1275 (2018)]. Motivated by these observations we consider how the
+picture of spin-orbit coupling through local inversion symmetry breaking might
+be observed in cuprate superconductors. Furthermore, we examine two spin-orbit
+driven effects, the spin-Hall effect and the Edelstein effect, focusing on the
+details of their realizations within both the normal and superconducting
+states.",1812.07949v2
+2014-08-08,Spin-Orbital Order Modified by Orbital Dilution in Transition Metal Oxides: From Spin Defects to Frustrated Spins Polarizing Host Orbitals,"We study the $3d$ substitution in $4d$ transition metal oxides in the cases
+of $3d^3$ doping at either $3d^2$ or $4d^4$ sites which realize orbital
+dilution. We derive the effective $3d-4d$ (or $3d-3d$) superexchange in a Mott
+insulator with different ionic valencies, underlining the emerging structure of
+the spin-orbital coupling between the impurity and the host sites and
+demonstrate that it is qualitatively different from that encountered in the
+host itself. This derivation shows that the interaction between the host and
+the impurity depends in a crucial way on the type of doubly occupied $t_{2g}$
+orbital. One finds that in some cases, due to the quench of the orbital degree
+of freedom at the $3d$ impurity, the spin and orbital order within the host is
+drastically modified by doping. The impurity acts either as a spin defect
+accompanied by an orbital vacancy in the spin-orbital structure when the
+host-impurity coupling is weak, or it favors doubly occupied active orbitals
+(orbital polarons) along the $3d-4d$ bond leading to antiferromagnetic or
+ferromagnetic spin coupling. This competition between different magnetic
+couplings leads to quite different ground states. We find that magnetic
+frustration and spin degeneracy can be lifted by the quantum orbital flips of
+the host but they are robust in special regions of the incommensurate phase
+diagram. The spin-orbit coupling can lead to anisotropic spin and orbital
+patterns along the symmetry directions and cause a radical modification of the
+order imposed by the spin-orbital superexchange. Our findings are expected to
+be of importance for future theoretical understanding of experimental results
+for doped $4d$ transition metal oxides doped with $3d^3$ ions. We suggest how
+the local or global changes of the spin-orbital order induced by such
+impurities could be detected experimentally.",1408.1838v3
+2014-04-21,Graphene with wedge disclination in the presence of intrinsic and Rashba spin orbit couplings,"In this article, the modified Kane-Mele Hamiltonian is derived for graphene
+with wedge disclination and spin orbit couplings (intrinsic and Rashba). The
+wedge disclination changes the flat lattice into the conical lattice and hence
+modifies the spin orbit couplings. The Hamiltonian is exactly solved for the
+intrinsic spin orbit interaction and perturbatively for the Rashba spin orbit
+interaction. It is shown that there exists the Kramer's degenerate midgap
+localized spin separated fluxon states around the defect. These zero energy
+spin separated states occur at the external magnetic flux value
+$\Phi\pm\Delta\Phi$. The external magnetic flux $\Phi$ is introduced to make
+the wave-function periodic when the electron circulates around the defect. It
+is found that this separation occurs due to the effect of the conical curvature
+on the spin orbit coupling. Further, we find these results are robust to the
+addition of the Rashba spin orbit interaction which is important for the
+application to spintronics and nanoelectronics.",1404.5150v2
+2004-08-18,Hole dynamics in spin and orbital ordered vanadium perovskites,"Hole dynamics in spin and orbital ordered vanadates with perovskite structure
+is investigated. A mobile hole coupled to the spin excitation (magnon) in the
+spin G-type and orbital C-type (SG/OC) ordered phase, and that to the orbital
+excitation (orbiton) in the spin C-type and orbital G-type (SC/OG) one are
+formulated on an equal footing. The observed fragile character of the (SG/OC)
+order is attributed to the orbiton softening caused by a reduction of the
+taggered magnetic order parameter. It is proposed that the qualitatively
+different hole dynamics in the two spin-orbital ordered phases in vanadates can
+be probed by the optical spectra.",0408395v1
+2020-02-05,Correlated motion of particle-hole excitations across the renormalized spin-orbit gap in $\rm Sr_2 Ir O_4$,"The high-energy collective modes of particle-hole excitations across the
+spin-orbit gap in $\rm Sr_2IrO_4$ are investigated using the transformed
+Coulomb interaction terms in the pseudo-spin-orbital basis constituted by the
+$J=1/2$ and $3/2$ states arising from spin-orbit coupling. With appropriate
+interaction strengths and renormalized spin-orbit gap, these collective modes
+yield two well-defined propagating spin-orbit exciton modes, with energy scale
+and dispersion in excellent agreement with resonant inelastic X-ray scattering
+(RIXS) measurements.",2002.02415v1
+2006-11-06,Spin relaxation in a generic two-dimensional spin-orbit coupled system,"We study the relaxation of a spin density injected into a two-dimensional
+electron system with generic spin-orbit interactions. Our model includes the
+Rashba as well as linear and cubic Dresselhaus terms. We explicitly derive a
+general spin-charge coupled diffusion equation. Spin diffusion is characterized
+by just two independent dimensionless parameters which control the interplay
+between different spin-orbit couplings. The real-time representation of the
+diffuson matrix (Green's function of the diffusion equation) is evaluated
+analytically. The diffuson describes space-time dynamics of the injected spin
+distribution. We explicitly study two regimes: The first regime corresponds to
+negligible spin-charge coupling and is characterized by standard charge
+diffusion decoupled from the spin dynamics. It is shown that there exist
+several qualitatively different dynamic behaviors of the spin density, which
+correspond to various domains in the spin-orbit coupling parameter space. We
+discuss in detail a few interesting phenomena such as an enhancement of the
+spin relaxation times, real space oscillatory dynamics, and anisotropic
+transport. In the second regime, we include the effects of spin-charge
+coupling. It is shown that the spin-charge coupling leads to an enhancement of
+the effective charge diffusion coefficient. We also find that in the case of
+strong spin-charge coupling, the relaxation rates formally become complex and
+the spin/charge dynamics is characterized by real time oscillations. These
+effects are qualitatively similar to those observed in spin-grating experiments
+[Weber et al., Nature 437, 1330 (2005)].",0611165v1
+2011-10-06,Spin and pseudospin symmetry along with orbital dependency of the Dirac-Hulthen problem,"The role of the Hulthen potential on the spin and pseudospin symmetry
+solutions is investigated systematically by solving the Dirac equation with
+attractive scalar S(r) and repulsive vector V(r) potentials. The spin and
+pseudospin symmetry along with orbital dependency (pseudospin-orbit and
+spin-orbit dependent couplings) of the Dirac equation are included to the
+solution by introducing the Hulthen-square approximation. This effective
+approach is based on forming the spin and pseudo-centrifugal kinetic energy
+term from the square of the Hulthen potential. The analytical solutions of the
+Dirac equation for the Hulthen potential with the spin-orbit and
+pseudospin-orbit-dependent couplings are obtained by using the Nikiforov-Uvarov
+(NU) method. The energy eigenvalue equations and wave functions for various
+degenerate states are presented for several spin-orbital, pseudospin-orbital
+and radial quantum numbers under the condition of the spin and pseudospin
+symmetry. Keywords: Spin and pseudospin symmetry; orbital dependency; Dirac
+equation; Hulthen potential; Nikiforov-Uvarov Method.",1110.1225v1
+2013-11-07,Spin-Orbit Torques and Anisotropic Magnetization Damping in Skyrmion Crystals,"The length scale of the magnetization gradients in chiral magnets is
+determined by the relativistic Dzyaloshinskii-Moriya interaction. Thus, even
+conventional spin-transfer torques are controlled by the relativistic
+spin-orbit coupling in these systems, and additional relativistic corrections
+to the current-induced torques and magnetization damping become important for a
+complete understanding of the current-driven magnetization dynamics. We
+theoretically study the effects of reactive and dissipative homogeneous
+spin-orbit torques and anisotropic damping on the current-driven skyrmion
+dynamics in cubic chiral magnets. Our results demonstrate that spin-orbit
+torques play a significant role in the current-induced skyrmion velocity. The
+dissipative spin-orbit torque generates a relativistic Magnus force on the
+skyrmions, whereas the reactive spin-orbit torque yields a correction to both
+the drift velocity along the current direction and the transverse velocity
+associated with the Magnus force. The spin-orbit torque corrections to the
+velocity scale linearly with the skyrmion size, which is inversely proportional
+to the spin-orbit coupling. Consequently, the reactive spin-orbit torque
+correction can be the same order of magnitude as the non-relativistic
+contribution. More importantly, the dissipative spin-orbit torque can be the
+dominant force that causes a deflected motion of the skyrmions if the torque
+exhibits a linear or quadratic relationship with the spin-orbit coupling. In
+addition, we demonstrate that the skyrmion velocity is determined by
+anisotropic magnetization damping parameters governed by the skyrmion size.",1311.1778v1
+2016-02-15,Effects of Dephasing on Spin Lifetime in Ballistic Spin-Orbit Materials,"We theoretically investigate spin dynamics in spin-orbit-coupled materials.
+In the ballistic limit, the spin lifetime is dictated by dephasing that arises
+from energy broadening plus a non-uniform spin precession. For the case of
+clean graphene, we find a strong anisotropy with spin lifetimes that can be
+short even for modest energy scales, on the order of a few ns. These results
+offer deeper insight into the nature of spin dynamics in graphene, and are also
+applicable to the investigation of other systems where spin-orbit coupling
+plays an important role.",1602.04611v1
+2018-12-20,Non-local Spin-charge Conversion via Rashba Spin-Orbit Interaction,"We show theoretically that conversion between spin and charge by spin-orbit
+interaction in metals occurs even in a non-local setup where magnetization and
+spin-orbit interaction are spatially separated if electron diffusion is taken
+into account. Calculation is carried out for the Rashba spin-orbit interaction
+treating the coupling with a ferromagnet perturbatively. The results indicate
+the validity of the concept of effective spin gauge field (spin motive force)
+in the non-local configuration. The inverse Rashba-Edelstein effect observed
+for a trilayer of a ferromagnet, a normal metal and a heavy metal can be
+explained in terms of the non-local effective spin gauge field.",1812.08884v1
+2003-09-24,Orbital Wave and its Observation in Orbital Ordered Titanates and Vanadates,"We present a theory of the collective orbital excitation termed orbital wave
+in perovskite titanates and vanadates with the triply degenerate $t_{2g}$
+orbitals. The dispersion relations of the orbital waves for the orbital ordered
+LaVO$_3$, YVO$_3$ and YTiO$_3$ are examined in the effective spin-orbital
+coupled Hamiltonians associated with the Jahn-Teller type couplings. We propose
+possible scattering processes for the Raman and inelastic neutron scatterings
+from the orbital wave and calculate the scattering spectra for titanates and
+vanadates. It is found that both the excitation spectra and the observation
+methods of the orbital wave are distinct qualitatively from those for the $e_g$
+orbital ordered systems.",0309538v2
+2013-12-31,Anisotropic exchange coupling in a nanowire double quantum dot with strong spin-orbit coupling,"A spin-orbit qubit is a hybrid qubit that contains both orbital and spin
+degrees of freedom of an electron in a quantum dot. Here we study the exchange
+coupling between two spin-orbit qubits in a nanowire double quantum dot (DQD)
+with strong spin-orbit coupling (SOC). We find that while the total tunneling
+in the DQD is irrelevant to the SOC, both the spin-conserved and spin-flipped
+tunnelings are SOC dependent and can compete with each other in the strong SOC
+regime. Moreover, the Coulomb repulsion between electrons can combine with the
+SOC-dependent tunnelings to yield an anisotropic exchange coupling between the
+two spin-orbit qubits. Also, we give an explicit physical mechanism for this
+anisotropic exchange coupling.",1401.0101v2
+2023-11-15,Chirality-induced emergent spin-orbit coupling in topological atomic lattices,"Spin-orbit coupled dynamics are of fundamental interest in both quantum
+optical and condensed matter systems alike. In this work, we show that photonic
+excitations in pseudospin-1/2 atomic lattices exhibit an emergent spin-orbit
+coupling when the geometry is chiral. This spin-orbit coupling arises naturally
+from the electric dipole interaction between the lattice sites and leads to
+spin polarized excitation transport. Using a general quantum optical model, we
+determine analytically the conditions that give rise to spin-orbit coupling and
+characterize the behavior under various symmetry transformations. We show that
+chirality-induced spin textures are associated with a topologically nontrivial
+Zak phase that characterizes the chiral setup. Our results demonstrate that
+chiral atom arrays are a robust platform for realizing spin-orbit coupled
+topological states of matter.",2311.09303v1
+2012-05-15,Spin-Injection Spectroscopy of a Spin-Orbit Coupled Fermi Gas,"The coupling of the spin of electrons to their motional state lies at the
+heart of recently discovered topological phases of matter. Here we create and
+detect spin-orbit coupling in an atomic Fermi gas, a highly controllable form
+of quantum degenerate matter. We reveal the spin-orbit gap via spin-injection
+spectroscopy, which characterizes the energy-momentum dispersion and spin
+composition of the quantum states. For energies within the spin-orbit gap, the
+system acts as a spin diode. To fully inhibit transport, we open an additional
+spin gap, thereby creating a spin-orbit coupled lattice whose spinful band
+structure we probe. In the presence of s-wave interactions, such systems should
+display induced p-wave pairing, topological superfluidity, and Majorana edge
+states.",1205.3483v1
+1998-12-02,Theory of Orbital Excitation and Resonant Inelastic X-ray Scattering in Manganites,"We study theoretically the collective orbital excitation named orbital wave
+in the orbital ordered manganites.The dispersion relation of the orbital wave
+is affected by the static spin structure through the coupling between spin and
+orbital degrees of freedom. As a probe to detect the dispersion relation, we
+propose two possible methods by utilizing resonant inelastic x-ray scattering.
+The transition probability of the orbital wave scattering is formulated, and
+the momentum and polarization dependences of the structure factor are
+calculated in several types of the orbital and spin structures. The elastic
+x-ray scattering in the L-edge case to observe the orbital ordering is also
+discussed.",9812028v1
+2016-04-29,Tunable spin-charge conversion through topological phase transitions in zigzag nanoribbons,"We study spin-orbit torques and charge pumping in magnetic quasi-one
+dimensional zigzag nanoribbons with hexagonal lattice, in the presence of large
+intrinsic spin-orbit coupling. Such a system experiences topological phase
+transition from a trivial band insulator to a quantum spin Hall insulator
+either by tuning the magnetization direction or the intrinsic spin-orbit
+coupling. We find that spin-charge conversion efficiency (i.e. spin-orbit
+torque and charge pumping) is dramatically enhanced at the topological
+transition, displaying a substantial angular anisotropy.",1604.08782v1
+2014-02-24,Low-Energy Effective Hamiltonian for Giant-Gap Quantum Spin Hall Insulators in Honeycomb X-Hydride/Halide (X=N-Bi) Monolayers,"Using the tight-binding method in combination with first-principles
+calculations, we systematically derive a low-energy effective Hilbert subspace
+and Hamiltonian with spin-orbit coupling for two-dimensional hydrogenated and
+halogenated group-V monolayers. These materials are proposed to be giant-gap
+quantum spin Hall insulators with record huge bulk band gaps opened by the
+spin-orbit coupling at the Dirac points, e.g., from 0.74 to 1.08 eV in
+Bi\textit{X} (\textit{X} = H, F, Cl, and Br) monolayers. We find that the
+low-energy Hilbert subspace mainly consists of $p_{x}$ and $p_{y}$ orbitals
+from the group-V elements, and the giant first-order effective intrinsic
+spin-orbit coupling is from the on-site spin-orbit interaction. These features
+are quite distinct from those of group-IV monolayers such as graphene and
+silicene. There, the relevant orbital is $p_z$ and the effective intrinsic
+spin-orbit coupling is from the next-nearest-neighbor spin-orbit interaction
+processes. These systems represent the first real 2D honeycomb lattice
+materials in which the low-energy physics is associated with $p_{x}$ and
+$p_{y}$ orbitals. A spinful lattice Hamiltonian with an on-site spin-orbit
+coupling term is also derived, which could facilitate further investigations of
+these intriguing topological materials.",1402.5817v2
+2002-08-27,Conductance of a quantum point contact in the presence of spin-orbit interaction,"A recursive Green's function technique is developed to calculate the
+spin-dependent conductance in mesoscopic structures. Using this technique, we
+study the spin-dependent electronic transport of quantum point contacts in the
+presence of the Rashba spin-orbit interaction. We observed that some
+oscillations in the `quantized' conductance are induced by the spin-orbit
+interaction, and indicated that the oscillations may stem from the spin-orbit
+coupling associated multiple reflections. It is also indicated that the 0.7
+structure of the conductance observed in mesoscopic experiments would not stem
+from the spin-orbit interaction.",0208506v1
+2022-01-27,Superfluid transition temperature and fluctuation theory of spin-orbit and Rabi-coupled fermions with tunable interactions,"We obtain the superfluid transition temperature of equal Rashba-Dresselhaus
+spin-orbit and Rabi-coupled Fermi superfluids, from the
+Bardeen-Cooper-Schrieffer (BCS) to Bose-Einstein condensate (BEC) regimes in
+three dimensions for tunable $s$-wave interactions. In the presence of Rabi
+coupling, we find that spin-orbit coupling enhances (reduces) the critical
+temperature in the BEC (BCS) limit. For fixed interactions, we show that
+spin-orbit coupling can convert a first-order (discontinuous) phase transition
+into a second-order (continuous) phase transition, as a function of Rabi
+coupling. We derive the Ginzburg-Landau free energy to sixth power in the
+superfluid order parameter to describe both continuous and discontinuous phase
+transitions as a function of spin-orbit and Rabi couplings. Lastly, we develop
+a time-dependent Ginzburg-Landau fluctuation theory for an arbitrary mixture of
+Rashba and Dresselhaus spin-orbit couplings at any interaction strength.",2201.11823v2
+2009-05-12,Pauli Spin Blockade in the Presence of Strong Spin-Orbit Coupling,"We study electron transport in a double quantum dot in the Pauli spin
+blockade regime, in the presence of strong spin-orbit coupling. The effect of
+spin-orbit coupling is incorporated into a modified interdot tunnel coupling.
+We elucidate the role of the external magnetic field, the nuclear fields in the
+dots, and spin relaxation. We find qualitative agreement with experimental
+observations, and we propose a way to extend the range of magnetic fields in
+which blockade can be observed.",0905.1818v1
+2012-09-21,Adiabatic pumping through an interacting quantum dot with spin-orbit coupling,"We study adiabatic pumping through a two-level quantum dot with spin-orbit
+coupling. Using a diagrammatic real-time approach, we calculate both the pumped
+charge and spin for a periodic variation of the dot's energy levels in the
+limit of weak tunnel coupling. Thereby, we compare the two limits of vanishing
+and infinitely large charging energy on the quantum dot. We discuss the
+dependence of the pumped charge and pumped spin on gate voltages, the symmetry
+in the tunnel-matrix elements and spin-orbit coupling strength. We identify the
+possibility to generate pure spin currents in the absence of charge currents.",1209.4770v2
+2017-07-14,Insights into the orbital magnetism of noncollinear magnetic systems,"The orbital magnetic moment is usually associated with the relativistic
+spin-orbit interaction, but recently it has been shown that noncollinear
+magnetic structures can also be its driving force. This is important not only
+for magnetic skyrmions, but also for other noncollinear structures, either
+bulk-like or at the nanoscale, with consequences regarding their experimental
+detection. In this work we present a minimal model that contains the effects of
+both the relativistic spin-orbit interaction and of magnetic noncollinearity on
+the orbital magnetism. A hierarchy of models is discussed in a step-by-step
+fashion, highlighting the role of time-reversal symmetry breaking for
+translational and spin and orbital angular motions. Couplings of spin-orbit and
+orbit-orbit type are identified as arising from the magnetic noncollinearity.
+We recover the atomic contribution to the orbital magnetic moment, and a
+nonlocal one due to the presence of circulating bound currents, exploring
+different balances between the kinetic energy, the spin exchange interaction,
+and the relativistic spin-orbit interaction. The connection to the scalar spin
+chirality is examined. The orbital magnetism driven by magnetic noncollinearity
+is mostly unexplored, and the presented model contributes to laying its
+groundwork.",1707.04518v1
+2023-11-22,Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model,"We investigate the magnetic-field effects on a two-orbital Hubbard model that
+describes multiple spin states. Cobalt oxides have been investigated as
+materials possessing spin-state degrees of freedom due to the interplay between
+the Hund coupling interaction and crystalline field effect. In the competing
+region, quantum hybridizations between distinct spin states are expected to
+emerge, corresponding to excitonic condensation. Applied magnetic fields could
+also induce such a competition. To understand magnetic-field effects on
+excitonic condensation in multi-orbital systems, it is crucial to account for
+contributions from both spin and orbital degrees of freedom to magnetic
+properties. Here, we study field-induced phenomena in the two-orbital Hubbard
+model by focusing on the role of the orbital angular momentum. We
+comprehensively analyze this model on a square lattice employing the
+Hartree-Fock approximation. Omitting contributions from the orbital moment, we
+find that an applied magnetic field gives rise to two excitonic phases, besides
+the spin-state ordered phase, between the nonmagnetic low-spin and
+spin-polarized high-spin phases. One of these excitonic phases manifests a
+staggered-type spin-state order, interpreted as an excitonic supersolid state.
+Conversely, the other phase is not accompanied by it and exhibits only a spin
+polarization due to the applied magnetic field. When spin-orbit coupling is
+present, this phase displays a ferrimagnetic spin alignment attributed to spin
+anisotropy. Our analysis also reveals that incorporating the contribution of
+the orbital magnetic moment to the Zeeman term significantly alters the overall
+structure of the phase diagram. Notably, the orbital magnetization destabilizes
+the excitonic phase in contrast to scenarios without this contribution. We also
+discuss the relevance of our findings to real materials, such as cobalt oxides.",2311.13191v1
+2016-06-27,Supercurrent-Induced Spin-Orbit Torques,"We theoretically investigate the supercurrent-induced magnetization dynamics
+of a two-dimensional lattice of ferromagnetically ordered spins placed on a
+conventional superconductor with broken spatial inversion symmetry and strong
+spin-orbit coupling. We develop a phenomenological description of the coupled
+dynamics of the superconducting condensate and the spin system, and demonstrate
+that supercurrents produce a reactive spin-orbit torque on the magnetization.
+By performing a microscopic self-consistent calculation, we show that the
+spin-orbit torque originates from a spin-polarization of the Cooper pairs due
+to current-induced spin-triplet correlations. Interestingly, we find that there
+exists an intrinsic limitation for the maximum achievable spin-orbit torque,
+which is determined by the coupling strength between the condensate and the
+spin system. In proximitized hole-doped semiconductors, the maximum achievable
+spin-orbit torque field is estimated to be on the order of $0.16$ mT, which is
+comparable to the critical field for current-induced magnetization switching in
+ferromagnetic semiconductors.",1606.08470v1
+2005-08-02,Spin Accumulation in the Extrinsic Spin Hall Effect,"The drift-diffusion formalism for spin-polarized carrier transport in
+semiconductors is generalized to include spin-orbit coupling. The theory is
+applied to treat the extrinsic spin Hall effect using realistic boundary
+conditions. It is shown that carrier and spin diffusion lengths are modified by
+the presence of spin-orbit coupling and that spin accumulation due to the
+extrinsic spin Hall effect is strongly and qualitatively influenced by boundary
+conditions. Analytical formulas for the spin-dependent carrier recombination
+rates and inhomogeneous spin densities and currents are presented.",0508076v1
+2021-08-13,Coupling the Higgs mode and ferromagnetic resonance in spin-split superconductors with Rashba spin-orbit coupling,"We consider the Higgs mode at nonzero momentum in superconductors and
+demonstrate that in the presence of Rashba spin-orbit coupling, it couples
+linearly with an external exchange field. The Higgs-spin coupling dramatically
+modifies the spin susceptibility near the superconducting critical temperature
+and consequently enhances the spin pumping effect in a ferromagnetic
+insulator/superconductor bilayer system. We show that this effect can be
+detected by measuring the magnon-induced voltage generated by the inverse spin
+Hall effect.",2108.06202v2
+2020-06-03,"Magnetic reorientation transition in a three orbital model for $\rm Ca_2 Ru O_4$ -- Interplay of spin-orbit coupling, tetragonal distortion, and Coulomb interactions","Including the orbital off-diagonal spin and charge condensates in the self
+consistent determination of magnetic order within a realistic three-orbital
+model for the $4d^4$ compound $\rm Ca_2 Ru O_4$, reveals a host of novel
+features including strong and anisotropic spin-orbit coupling (SOC)
+renormalization, coupling of strong orbital magnetic moments to orbital fields,
+and a magnetic reorientation transition. Highlighting the rich interplay
+between orbital geometry and overlap, spin-orbit coupling, Coulomb
+interactions, tetragonal distortion, and staggered octahedral tilting and
+rotation, our investigation yields a planar antiferromagnetic (AFM) order for
+moderate tetragonal distortion, with easy $a-b$ plane and easy $b$ axis
+anisotropies, along with small canting of the dominantly $yz,xz$ orbital
+moments. With decreasing tetragonal distortion, we find a magnetic
+reorientation transition from the dominantly planar AFM order to a dominantly
+$c$ axis ferromagnetic (FM) order with significant $xy$ orbital moment.",2006.02114v2
+2019-12-11,Selective tuning of spin-orbital Kondo contributions in parallel-coupled quantum dots,"We use co-tunneling spectroscopy to investigate spin-, orbital-, and
+spin-orbital Kondo transport in a strongly confined system of InAs double
+quantum dots (QDs) parallel-coupled to source and drain. In the one-electron
+transport regime, the higher symmetry spin-orbital Kondo effect manifests at
+orbital degeneracy and no external magnetic field. We then proceed to show that
+the individual Kondo contributions can be isolated and studied separately;
+either by orbital detuning in the case of spin-Kondo transport, or by spin
+splitting in the case of orbital Kondo transport. By varying the inter-dot
+tunnel coupling, we show that lifting of the spin degeneracy is key to
+confirming the presence of an orbital degeneracy, and to detecting a small
+orbital hybridization gap. Finally, in the two-electron regime, we show that
+the presence of a spin-triplet ground state results in spin-Kondo transport at
+zero magnetic field.",1912.05181v2
+2018-01-25,Spin-relaxation anisotropy in a nanowire quantum dot with strong spin-orbit coupling,"We study the impacts of the magnetic field direction on the spin-manipulation
+and the spin-relaxation in a one-dimensional quantum dot with strong spin-orbit
+coupling. The energy spectrum and the corresponding eigenfunctions in the
+quantum dot are obtained exactly. We find that no matter how large the
+spin-orbit coupling is, the electric-dipole spin transition rate as a function
+of the magnetic field direction always has a $\pi$ periodicity. However, the
+phonon-induced spin relaxation rate as a function of the magnetic field
+direction has a $\pi$ periodicity only in the weak spin-orbit coupling regime,
+and the periodicity is prolonged to $2\pi$ in the strong spin-orbit coupling
+regime.",1801.08349v2
+2012-05-10,"3D quaternionic condensations, Hopf invariants, and skyrmion lattices with synthetic spin-orbit coupling","We study the topological configurations of the two-component condensates of
+bosons with the $3$D $\vec{\sigma}\cdot \vec{p}$ Weyl-type spin-orbit coupling
+subject to a harmonic trapping potential. The topology of the condensate
+wavefunctions manifests in the quaternionic representation. In comparison to
+the $U(1)$ complex phase, the quaternionic phase manifold is $S^3$ and the spin
+orientations form the $S^2$ Bloch sphere through the 1st Hopf mapping. The
+spatial distributions of the quaternionic phases exhibit the 3D skyrmion
+configurations, and the spin distributions possess non-trivial Hopf invariants.
+Spin textures evolve from the concentric distributions at the weak spin-orbit
+coupling regime to the rotation symmetry breaking patterns at the intermediate
+spin-orbit coupling regime. In the strong spin-orbit coupling regime, the
+single-particle spectra exhibit the Landau-level type quantization. In this
+regime, the three-dimensional skyrmion lattice structures are formed when
+interactions are below the energy scale of Landau level mixings. Sufficiently
+strong interactions can change condensates into spin-polarized plane-wave
+states, or, superpositions of two plane-waves exhibiting helical spin spirals.",1205.2162v3
+2013-01-21,Spin-orbit-induced bound state and molecular signature of the degenerate Fermi gas in a narrow Feshbach resonance,"In this paper we explore the spin-orbit-induced bound state and molecular
+signature of the degenerate Fermi gas in a narrow Feshbach resonance based on a
+generalized two-channel model. Without the atom-atom interactions, only one
+bound state can be found even if spin-orbit coupling exists. Moreover, the
+corresponding bound-state energy depends strongly on the strength of spin-orbit
+coupling, but is influenced slightly by its type. In addition, we find that
+when increasing the strength of spin-orbit coupling, the critical point at
+which the molecular fraction vanishes shifts from zero to the negative
+detuning. In the weak spin-orbit coupling, this shifting is proportional to the
+square of its strength. Finally, we also show that the molecular fraction can
+be well controlled by spin-orbit coupling.",1301.4718v2
+2015-12-08,Multi-orbital quantum antiferromagnetism in iron pnictides --- effective spin couplings and quantum corrections to sublattice magnetization,"Towards understanding the multi-orbital quantum antiferromagnetism in iron
+pnictides, effective spin couplings and spin fluctuation induced quantum
+corrections to sublattice magnetization are obtained in the $(\pi,0)$ AF state
+of a realistic three band interacting electron model involving $xz$, $yz$, and
+$xy$ Fe 3d orbitals. The $xy$ orbital is found to be mainly responsible for the
+generation of strong ferromagnetic spin coupling in the $b$ direction, which is
+critically important to fully account for the spin wave dispersion as measured
+in inelastic neutron scattering experiments. The ferromagnetic spin coupling is
+strongly suppressed as the $xy$ band approaches half filling, and is ascribed
+to particle-hole exchange in the partially filled $xy$ band. The strongest AF
+spin coupling in the $a$ direction is found to be in the orbital off diagonal
+sector involving the $xz$ and $xy$ orbitals. First order quantum corrections to
+sublattice magnetization are evaluated for the three orbitals, and yield a
+significant $37\%$ average reduction from the Hartree-Fock value.",1512.02398v1
+2003-10-01,Rashba coupling in quantum dots: exact solution,"We present an analytic solution to the problem of the Rashba spin-orbit
+coupling in semiconductor quantum dots. We calculate the exact energy spectrum,
+wave-functions, and spin--flip relaxation times. We discuss various effects
+inaccessible via perturbation theory. In particular, we find that the effective
+gyromagnetic ratio is strongly suppressed by the spin-orbit coupling. The
+spin-flip relaxation rate has a maximum as a function of the spin-orbit
+coupling and is therefore suppressed in both the weak- and strong coupling
+limits.",0310024v2
+2003-05-30,Mesoscopic effects in adiabatic spin pumping,"We show that temporal shape modulations (pumping) of a quantum dot in the
+presence of spin-orbital coupling lead to a finite dc spin current. Depending
+on the strength of the spin-orbit coupling, the spin current is polarized
+perpendicular to the plane of the two-dimensional electron gas, or has an
+arbitrary direction subject to mesoscopic fluctuations. We analyze the
+statistics of the spin and charge currents in the adiabatic limit for the full
+cross-over from weak to strong spin-orbit coupling.",0306001v2
+2003-10-06,Spin Current in Spin-Orbit Coupling Systems,"We present a simple and pedagogical derivation of the spin current as the
+linear response to an external electric field for both Rashba and Luttinger
+spin-orbital coupling Hamiltonians. Except for the adiabatic approximation, our
+derivation is exact to the linear order of the electric field for both models.
+The spin current is a direct result of the difference in occupation levels
+between different bands. Moreover, we show a general topological spin current
+can be defined for a broad class of spin-orbit coupling systems.",0310093v2
+2006-04-21,Dissipationless spin-current between Heisenberg ferromagnets with spin-orbit coupling,"A system exhibiting multiple simultaneously broken symmetries offers the
+opportunity to influence physical phenomena such as tunneling currents by means
+of external control parameters. Time-reversal symmetry and inversion symmetry
+are both absent in ferromagnetic metals with substantial spin-orbit coupling.
+We here study transport of spin in a system consisting of two ferromagnets with
+spin-orbit coupling separated by an insulating tunneling junction. A persistent
+spin-current across the junction is found, which can be controlled in a
+well-defined manner by external magnetic and electric fields. The behavior of
+the spin-current for important geometries and limits is studied.",0604510v1
+2007-08-27,Diffusive-Ballistic Crossover and the Persistent Spin Helix,"Conventional transport theory focuses on either the diffusive or ballistic
+regimes and neglects the crossover region between the two. In the presence of
+spin-orbit coupling, the transport equations are known only in the diffusive
+regime, where the spin precession angle is small. In this paper, we develop a
+semiclassical theory of transport valid throughout the diffusive - ballistic
+crossover of a special SU(2) symmetric spin-orbit coupled system. The theory is
+also valid in the physically interesting regime where the spin precession angle
+is large. We obtain exact expressions for the density and spin structure
+factors in both 2 and 3 dimensional samples with spin-orbit coupling.",0708.3618v1
+2014-03-17,Single-parameter spin-pumping in driven metallic rings with spin-orbit coupling,"We consider the generation of a pure spin-current at zero bias voltage with a
+single time-dependent potential. To such end we study a device made of a
+mesoscopic ring connected to electrodes and clarify the interplay between a
+magnetic flux, spin-orbit coupling and non-adiabatic driving in the production
+of a spin and electrical current. By using Floquet theory, we show that the
+generated spin to charge current ratio can be controlled by tuning the
+spin-orbit coupling.",1403.4265v1
+2005-03-07,Topological Orbital Angular Momentum Hall Current,"We show that there is a fundamental difference between spin Hall current and
+orbital angular momentum Hall current in Rashba- Dresselhaus spin orbit
+coupling systems. The orbital angular momentum Hall current has a pure
+topological contribution which is originated from the existence of magnetic
+flux in momentum space while there is no such topological nature for the spin
+Hall current. Moreover, we show that the orbital Hall conductance is always
+larger than the spin Hall conductance in the presence of both couplings. The
+topological part is expected to be free from the effect of disorder due to the
+topological nature. Therefore, the orbital angular momentum Hall current should
+be the major effect in real experiments.",0503149v2
+2016-07-19,Emergent spin-valley-orbital physics by spontaneous parity breaking,"The spin-orbit coupling in the absence of spatial inversion symmetry plays an
+important role in realizing intriguing electronic states in solids, such as
+topological insulators and unconventional superconductivity. Usually, the
+inversion symmetry breaking is inherent in the lattice structures, and hence,
+it is not easy to control these interesting properties by external parameters.
+We here theoretically investigate the possibility of generating the
+spin-orbital entanglement by spontaneous electronic ordering caused by electron
+correlations. In particular, we focus on the centrosymmetric lattices with
+local asymmetry at the lattice sites, e.g., zig-zag, honeycomb, and diamond
+structures. In such systems, conventional staggered orders, such as charge
+order and antiferromagnetic order, break the inversion symmetry and activate
+the antisymmetric spin-orbit coupling, which is hidden in a
+sublattice-dependent form in the paramagnetic state. Considering a minimal
+two-orbital model on a honeycomb lattice, we scrutinize the explicit form of
+the antisymmetric spin-orbit coupling for all the possible staggered charge,
+spin, orbital, and spin-orbital orders. We show that the complete table is
+useful for understanding of spin-valley-orbital physics, such as spin and
+valley splitting in the electronic band structure and generalized
+magnetoelectric responses in not only spin but also orbital and spin-orbital
+channels, reflecting in peculiar magnetic, elastic, and optical properties in
+solids.",1607.05782v1
+2022-07-21,"Spin-orbit transitions in the N$^+$($^3P_{J_A}$) + H$_2$ $\rightarrow$ NH$^+$($X^2Π$, $^4Σ^-$)+ H($^2S$) reaction, using adiabatic and mixed quantum-adiabatic statistical approaches","The cross section and rate constants for the title reaction are calculated
+for all the spin-orbit states of N$^+$($^3P_{J_A}$) using two statistical
+approaches, one purely adiabatic and the other one mixing quantum capture for
+the entrance channel and adiabatic treatment for the products channel. This is
+made by using a symmetry adapted basis set combining electronic (spin and
+orbital) and nuclear angular momenta in the reactants channel. To this aim,
+accurate {\it ab initio} calculations are performed separately for reactants
+and products. In the reactants channel, the three lowest electronic states
+(without spin-orbit couplings) have been diabatized, and the spin-orbit
+couplings have been introduced through a model localizing the spin-orbit
+interactions in the N$^+$ atom, which yields accurate results as compared to
+{\it ab initio} calculations including spin-orbit couplings. For the products,
+eleven purely adiabatic spin-orbit states have been determined with {\it ab
+initio} calculations. The reactive rate constants thus obtained are in very
+good agreement with the available experimental data for several ortho-H$_2$
+fractions, assuming a thermal initial distribution of spin-orbit states. The
+rate constants for selected spin-orbit $J_A$ states are obtained, to provide a
+proper validation of the spin-orbit effects to obtain the experimental rate
+constants.",2207.10360v1
+2016-01-28,Interfacial spin-orbit torque without bulk spin-orbit coupling,"An electric current in the presence of spin-orbit coupling can generate a
+spin accumulation that exerts torques on a nearby magnetization. We demonstrate
+that, even in the absence of materials with strong bulk spin-orbit coupling, a
+torque can arise solely due to interfacial spin-orbit coupling, namely
+Rashba-Eldestein effects at metal/insulator interfaces. In magnetically soft
+NiFe sandwiched between a weak spin-orbit metal (Ti) and insulator
+(Al$_2$O$_3$), this torque appears as an effective field, which is
+significantly larger than the Oersted field and sensitive to insertion of an
+additional layer between NiFe and Al$_2$O$_3$. Our findings point to new routes
+for tuning spin-orbit torques by engineering interfacial electric dipoles.",1601.07687v2
+2023-06-05,Accurate and efficient treatment of spin-orbit coupling via second variation employing local orbitals,"A new method is presented that allows for efficient evaluation of spin-orbit
+coupling (SOC) in density-functional theory calculations. In the so-called
+second-variational scheme, where Kohn-Sham functions obtained in a
+scalar-relativistic calculation are employed as a new basis for the
+spin-orbit-coupled problem, we introduce a rich set of local orbitals as
+additional basis functions. Also relativistic local orbitals can be used. The
+method is implemented in the all-electron full-potential code \exciting. We
+show that, for materials with strong SOC effects, this approach can reduce the
+overall basis-set size and thus computational costs tremendously.",2306.02965v1
+2011-06-26,Intrinsic spin-orbit coupling in superconducting δ-doped SrTiO3 heterostructures,"We report the violation of the Pauli limit due to intrinsic spin-orbit
+coupling in SrTiO3 heterostructures. Via selective doping down to a few
+nanometers, a two-dimensional superconductor is formed, geometrically
+suppressing orbital pair-breaking. The spin-orbit scattering is exposed by the
+robust in-plane superconducting upper critical field, exceeding the Pauli limit
+by a factor of 4. Transport scattering times several orders of magnitude higher
+than for conventional thin film superconductors enables a new regime to be
+entered, where spin-orbit coupling effects arise non-perturbatively.",1106.5193v1
+2020-01-23,Bright solitons in a spin-tensor-momentum-coupled Bose-Einstein condensate,"Synthetic spin-tensor-momentum coupling has recently been proposed to realize
+in atomic Bose-Einstein condensates. Here we study bright solitons in
+Bose-Einstein condensates with spin-tensor-momentum coupling and spin-orbit
+coupling. The properties and dynamics of spin-tensor-momentum-coupled and
+spin-orbit-coupled bright solitons are identified to be different. We
+contribute the difference to the different symmetries.",2001.08794v1
+2022-01-17,Spin-orbit-coupled superconductivity with spin-singlet non-unitary pairing,"An unconventional superconductor is distinguished with two types of gap
+functions: unitary and non-unitary. This core subject has been concentrated on
+purely spin-triplet or singlet-triplet mixed superconductors. However, the
+generalization to a purely spin-singlet superconductor has remained primarily
+of theoretical interest, which requires at least a multi-orbital correlated
+electronic systems. In this work, we present a possible establishment of both
+unitary and non-unitary pairings for spin-singlet superconductors with two
+atomic orbitals. Then we investigate the effects of atomic spin-orbit coupling
+and find a new spin-orbit-coupled non-unitary superconductor that supports
+exotic phenomena. Remarkably, there are mainly three features. Firstly, the
+atomic spin-orbit coupling locks the electron spins to be out-of-plane, which
+could give birth to the Type II Ising superconductivity with a large in-plane
+upper critical field compared to the Pauli limit. Secondly, topological chiral
+or helical Majorana edge state could be realized even in the absence of
+external magnetic fields or Zeeman fields. In addition, a spin-polarized
+superconducting state could even be generated by spin-singlet non-unitary
+pairings with spontaneous time-reversal breaking, which severs as a smoking gun
+to detect this exotic state by measuring the spin-resolved density of states.
+Therefore, our work might pave a new avenue to spin-orbit-coupled
+superconductors with spin-singlet non-unitary pairing symmetries.",2201.06265v2
+2017-12-08,Spin-orbit coupling induced valley Hall effects in transition-metal dichalcogenides,"In transition-metal dichalcogenides, electrons in the K-valleys can
+experience both Ising and Rashba spin-orbit couplings. In this work, we show
+that the coexistence of Ising and Rashba spin-orbit couplings leads to a
+special type of valley Hall effect, which we call spin-orbit coupling induced
+valley Hall effect. Importantly, near the conduction band edge, the
+valley-dependent Berry curvatures generated by spin-orbit couplings are highly
+tunable by external gates and dominate over the intrinsic Berry curvatures
+originating from orbital degrees of freedom under accessible experimental
+conditions. We show that the spin-orbit coupling induced valley Hall effect is
+manifested in the gate dependence of the valley Hall conductivity, which can be
+detected by Kerr effect experiments.",1712.02942v2
+2003-06-27,Orbital moment in CoO and in NiO,"The total, orbital and spin moment of the Co2+ ion in CoO has been calculated
+within the quasi-atomic approach with taking into account strong correlations,
+crystal-field interactions and the intra-atomic spin-orbit coupling. The
+orbital moment of 1.39 \mu B amounts at 0 K, in the magnetically-ordered state,
+to more than 34% of the total moment (4.01 \mu B). The same calculations yield
+for NiO the orbital and total moment of 0.46 \mu B and 2.45 \mu B,
+respectively.
+  PACS No: 71.70.E; 75.10.D
+  Keywords: 3d magnetism, crystal field, spin-orbit coupling, orbital moment,
+CoO, NiO",0306695v2
+2008-02-10,Coupling of Spin and Orbital Motion of Electrons in Carbon Nanotubes,"Electrons in atoms possess both spin and orbital degrees of freedom. In
+non-relativistic quantum mechanics, these are independent, resulting in large
+degeneracies in atomic spectra. However, relativistic effects couple the spin
+and orbital motion leading to the well-known fine structure in their spectra.
+The electronic states in defect-free carbon nanotubes (NTs) are widely believed
+to be four-fold degenerate, due to independent spin and orbital symmetries, and
+to also possess electron-hole symmetry. Here we report measurements
+demonstrating that in clean NTs the spin and orbital motion of electrons are
+coupled, thereby breaking all of these symmetries. This spin-orbit coupling is
+directly observed as a splitting of the four-fold degeneracy of a single
+electron in ultra-clean quantum dots. The coupling favours parallel alignment
+of the orbital and spin magnetic moments for electrons and anti-parallel
+alignment for holes. Our measurements are consistent with recent theories that
+predict the existence of spin-orbit coupling in curved graphene and describe it
+as a spin-dependent topological phase in NTs. Our findings have important
+implications for spin-based applications in carbon-based systems, entailing new
+design principles for the realization of qubits in NTs and providing a
+mechanism for all-electrical control of spins in NTs.",0802.1351v1
+2013-09-16,Spin Hot Spots in Single-Electron GaAs-based Quantum Dots,"Spin relaxation of a single electron in a weakly coupled double quantum dot
+is calculated numerically. The phonon assisted spin flip is allowed by the
+presence of the linear and cubic spin-orbit couplings and nuclear spins. The
+rate is calculated as a function of the interdot coupling, the magnetic field
+strength and orientation, and the dot bias. In an in-plane magnetic field, the
+rate is strongly anisotropic with respect to the magnetic field orientation,
+due to the anisotropy of the spin-orbit interactions. The nuclear spin
+influence is negligible. In an out-of-plane field, the nuclear spins play a
+more important role due selection rules imposed on the spin-orbit couplings.
+Our theory shows a very good agreement with data measured in [Srinivasa, et
+al., PRL 110, 196803 (2013)], allowing us to extract information on the linear
+spin-orbit interactions strengths in that experiment. We estimate that they
+correspond to spin-orbit lengths of about 5-15 $\mu$m.",1309.3852v1
+2015-02-18,Quenching of dynamic nuclear polarization by spin-orbit coupling in GaAs quantum dots,"The central-spin problem, in which an electron spin interacts with a nuclear
+spin bath, is a widely studied model of quantum decoherence. Dynamic nuclear
+polarization (DNP) occurs in central spin systems when electronic angular
+momentum is transferred to nuclear spins and is exploited in spin-based quantum
+information processing for coherent electron and nuclear spin control. However,
+the mechanisms limiting DNP remain only partially understood. Here, we show
+that spin-orbit coupling quenches DNP in a GaAs double quantum dot, even though
+spin-orbit coupling in GaAs is weak. Using Landau-Zener sweeps, we measure the
+dependence of the electron spin-flip probability on the strength and direction
+of in-plane magnetic field, allowing us to distinguish effects of the
+spin-orbit and hyperfine interactions. To confirm our interpretation, we
+measure high-bandwidth correlations in the electron spin-flip probability and
+attain results consistent with a significant spin-orbit contribution. We
+observe that DNP is quenched when the spin-orbit component exceeds the
+hyperfine, in agreement with a theoretical model. Our results shed new light on
+the surprising competition between the spin-orbit and hyperfine interactions in
+central-spin systems.",1502.05400v1
+2003-10-08,Efficient electron spin manipulation in a quantum well by an in-plane electric field,"Electron spins in a semiconductor quantum well couple to an electric field
+{\it via} spin-orbit interaction. We show that the standard spin-orbit coupling
+mechanisms can provide extraordinary efficient electron spin manipulation by an
+in-plane ac electric field.",0310192v1
+2007-07-26,Quasiclassical approach and spin-orbit coupling,"We discuss the quasiclassical Green function method for a two-dimensional
+electron gas in the presence of spin-orbit coupling, with emphasis on the
+meaning of the $\xi$-integration procedure. As an application of our approach,
+we demonstrate how the spin-Hall conductivity, in the presence of spin-flip
+scattering, can be easily obtained from the spin-density continuity equation.",0707.3908v1
+2007-06-04,Kinetic investigation on extrinsic spin Hall effect induced by skew scattering,"The kinetics of the extrinsic spin Hall conductivity induced by the skew
+scattering is performed from the fully microscopic kinetic spin Bloch equation
+approach in $(001)$ GaAs symmetric quantum well. In the steady state, the
+extrinsic spin Hall current/conductivity vanishes for the linear-$\mathbf k$
+dependent spin-orbit coupling and is very small for the cubic-$\mathbf k$
+dependent spin-orbit coupling. The spin precession induced by the
+Dresselhaus/Rashba spin-orbit coupling plays a very important role in the
+vanishment of the extrinsic spin Hall conductivity in the steady state. An
+in-plane spin polarization is induced by the skew scattering, with the help of
+the spin-orbit coupling. This spin polarization is very different from the
+current-induced spin polarization.",0706.0370v2
+2013-02-05,Inertial effect on spin orbit coupling and spin transport,"We theoretically study the renormalization of inertial effects on the spin
+dependent transport of conduction electrons in a semiconductor by taking into
+account the interband mixing on the basis of k.p perturbation theory. In our
+analysis, for the generation of spin current we have used the extended Drude
+model where the spin orbit coupling plays an important role. We predict
+enhancement of the spin current resulting from the rerormalized spin orbit
+coupling effective in our model in cubic and non cubic crystal. Attention has
+been paid to clarify the importance of gauge fields in the spin transport of
+this inertial system. A theoretical proposition of a perfect spin filter has
+been done through the Aharanov Casher like phase corresponding to this inertial
+system. For a time dependent acceleration, effect of $\vec{k} . \vec{p}$
+perturbation on the spin current and spin polarization has also been addressed.
+Furthermore, achievement of a tunable source of polarized spin current through
+the non uniformity of the inertial spin orbit coupling strength has also been
+discussed.",1302.1063v3
+2020-02-04,Isotropic All-electric Spin analyzer based on a quantum ring with spin-orbit coupling,"Here we propose an isotropic all electrical spin analyzer in a quantum ring
+with spin-orbit coupling by analytically and numerically modeling how the
+charge transmission rates depend on the polarization of the incident spin. The
+formalism of spin transmission and polarization rates in an arbitrary direction
+is also developed by analyzing the Aharonov-Bohm and the Aharonov-Casher
+effects. The topological spin texture induced by the spin-orbit couplings
+essentially contributes to the dynamic phase and plays an important role in
+spin transport. The spin transport features derived analytically has been
+confirmed numerically. This interesting two-dimensional electron system can be
+designed as a spin filter, spin polarizer and general analyzer by simply tuning
+the spin-orbit couplings, which paves the way for realizing the tunable and
+integrable spintronics device.",2002.01151v1
+2006-02-23,Spin-orbit interaction in quantum dots in the presence of exchange correlations,"We discuss the problem of spin-orbit interaction in a 2D chaotic or diffusive
+quantum dot in the presence of exchange correlations. Spin-orbit scattering
+breaks spin rotation invariance, and in the crossover regime between different
+symmetries of the spin-orbit coupling, the problem has no closed solution. A
+conventional choice of a many-particle basis in a numerical diagonalization is
+the set of Slater determinants built from the single-particle eigenstates of
+the one-body Hamiltonian (including the spin-orbit terms). We develop a
+different approach based on the use of a good-spin many-particle basis that is
+composed of the eigenstates of the universal Hamiltonian in the absence of
+spin-orbit scattering. We introduce a complete labelling of this good-spin
+basis and use angular momentum algebra to calculate in closed form the matrix
+elements of the spin-orbit interaction in this basis. Spin properties, such as
+the ground-state spin distribution and the spin excitation function, are easily
+calculated in this basis.",0602552v1
+2011-10-30,Quasiparticle velocities in 2D electron/hole liquids with spin-orbit coupling,"We study the influence of spin-orbit interactions on quasiparticle
+dispersions in two-dimensional electron and heavy-hole liquids in III-V
+semiconductors. To obtain closed-form analytical results, we restrict ourselves
+to spin-orbit interactions with isotropic spectrum and work within the screened
+Hartree-Fock approximation, valid in the high-density limit. For electrons
+having a linear-in-momentum Rashba (or, equivalently, Dresselhaus) spin-orbit
+interaction, we show that the screened Hartree-Fock approximation recovers
+known results based on the random-phase approximation and we extend those
+results to higher order in the spin-orbit coupling. While the well-studied case
+of electrons leads only to a weak modification of quasiparticle properties in
+the presence of the linear-in-momentum spin-orbit interaction, we find two
+important distinctions for hole systems (with a leading nonlinear-in-momentum
+spin-orbit interaction). First, the group velocities associated with the two
+hole-spin branches acquire a significant difference in the presence of
+spin-orbit interactions, allowing for the creation of spin-polarized
+wavepackets in zero magnetic field. Second, we find that the interplay of
+Coulomb and spin-orbit interactions is significantly more important for holes
+than for electrons and can be probed through the quasiparticle group
+velocities. These effects should be directly observable in magnetotransport,
+Raman scattering, and femtosecond-resolved Faraday rotation measurements. Our
+results are in agreement with a general argument on the velocities, which we
+formulate for an arbitrary choice of the spin-orbit coupling.",1110.6661v2
+2003-11-04,Twisted exchange interaction between localized spins embedded in a one- or two-dimensional electron gas with Rashba spin-orbit coupling,"We study theoretically the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction
+in one- and two-dimensions in presence of a Rashba spin-orbit (SO) coupling. We
+show that rotation of the spin of conduction electrons due to SO coupling
+causes a twisted RKKY interaction between localized spins which consists of
+three different terms: Heisenberg, Dzyaloshinsky-Moriya, and Ising
+interactions. We also show that the effective spin Hamiltonian reduces to the
+usual RKKY interaction Hamiltonian in the twisted spin space where the spin
+quantization axis of one localized spin is rotated.",0311054v1
+2005-07-13,Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O I: d-vector under zero magnetic field,"The d-vector in possibile spin triplet superconductor Na_{x}CoO_{2}yH_{2}O is
+microscopically investigated on the basis of the multi-orbital Hubbard model
+including the atomic spin-orbit coupling. As a result of the perturbation
+theory, we obtain the stable spin triplet superconductivity where the p-wave
+and f-wave states can be stabilized. If we neglect the spin-orbit coupling,
+superconducting state has 6-fold (3-fold) degeneracy in the p-wave (f-wave)
+state. This degeneracy is lifted by the spin-orbit coupling. We determine the
+d-vector within the linearlized Dyson-Gorkov equation. It is shown that the
+d-vector is always along the plane when the pairing symmetry is p-wave, while
+it depends on the parameters in case of the f-wave state. The lifting of
+degeneracy is significant in the p-wave state while it is very small in the
+f-wave state. This is because the first order term with respect to the
+spin-orbit coupling is effective in the former case, while it is ineffective in
+the latter case. The consistency of these results with NMR and \muSR
+measurements are discussed.",0507305v1
+2015-03-02,The Kondo Temperature of a Two-dimensional Electron Gas with Rashba Spin-orbit Coupling,"We use the Hirsch-Fye quantum Monte Carlo method to study the single magnetic
+impurity problem in a two-dimensional electron gas with Rashba spin-orbit
+coupling. We calculate the spin susceptibility for various values of spin-orbit
+coupling, Hubbard interaction, and chemical potential. The Kondo temperatures
+for different parameters are estimated by fitting the universal curves of spin
+susceptibility. We find that the Kondo temperature is almost a linear function
+of Rashba spin-orbit energy when the chemical potential is close to the edge of
+the conduction band. When the chemical potential is far away from the band
+edge, the Kondo temperature is independent of the spin-orbit coupling. These
+results demonstrate that, for single impurity problem in this system, the most
+important reason to change the Kondo temperature is the divergence of density
+of states near the band edge, and the divergence is induced by the Rashba
+spin-orbit coupling.",1503.00449v2
+2013-09-05,Current-induced torques and interfacial spin-orbit coupling,"In bilayer systems consisting of an ultrathin ferromagnetic layer adjacent to
+a metal with strong spin-orbit coupling, an applied in-plane current induces
+torques on the magnetization. The torques that arise from spin-orbit coupling
+are of particular interest. Here, we calculate the current-induced torque in a
+Pt-Co bilayer to help determine the underlying mechanism using first principles
+methods. We focus exclusively on the analogue to the Rashba torque, and do not
+consider the spin Hall effect. The details of the torque depend strongly on the
+layer thicknesses and the interface structure, providing an explanation for the
+wide variation in results found by different groups. The torque depends on the
+magnetization direction in a way similar to that found for a simple Rashba
+model. Artificially turning off the exchange spin splitting and separately the
+spin-orbit coupling potential in the Pt shows that the primary source of the
+""field-like"" torque is a proximate spin-orbit effect on the Co layer induced by
+the strong spin-orbit coupling in the Pt.",1309.1356v1
+2022-04-25,Harmonic generation in bent graphene with artificially-enhanced spin-orbit coupling,"We theoretically investigate the nonlinear response of bent graphene, in the
+presence of artificially-enhanced spin-orbit coupling, which can occur either
+via adatom deposition, or by placing the sheet of bent graphene in contact with
+a spin-orbit active substrate. We discuss the interplay between the spin-orbit
+coupling and the artificial magnetic field generated by the bending, for both
+the cases of Rashba and intrinsic spin-orbit coupling. For the latter, we
+introduce a spin-field interaction Hamiltonian addressing directly the electron
+spin as a degree of freedom. Our findings reveal that in this case, by
+controlling the amount of spin-orbit coupling, it is possible to significantly
+tune the spectrum of the nonlinear signal, achieving, in principle, efficient
+conversion of light from THz to UV region.",2204.11664v3
+2009-04-07,Curvature-enhanced spin-orbit coupling in a carbon nanotube,"Structure of the spin-orbit coupling varies from material to material and
+thus finding the correct spin-orbit coupling structure is an important step
+towards advanced spintronic applications. We show theoretically that the
+curvature in a carbon nanotube generates two types of the spin-orbit coupling,
+one of which was not recognized before. In addition to the topological
+phase-related contribution of the spin-orbit coupling, which appears in the
+off-diagonal part of the effective Dirac Hamiltonian of carbon nanotubes, there
+is another contribution that appears in the diagonal part. The existence of the
+diagonal term can modify spin-orbit coupling effects qualitatively, an example
+of which is the electron-hole asymmetric spin splitting observed recently, and
+generate four qualitatively different behavior of energy level dependence on
+parallel magnetic field. It is demonstrated that the diagonal term applies to a
+curved graphene as well. This result should be valuable for spintronic
+applications of graphitic materials.",0904.1185v2
+2020-03-23,Spin-orbit-coupling-assisted roton softening and superstripes in a Rydberg-dressed Bose-Einstein Condensate,"Rotons can exist in ultracold atomic gases either with long-range
+interactions or with spin-orbitcoupled dispersions. We find that two different
+kinds of rotons coexist in a joint system combining long-range interactions and
+spin-orbit coupling. One roton originates from spin-orbit coupling and two
+others come from long-range interactions. Their softening can be controlled
+separately. The interesting new phenomenon which we find is that
+spin-orbit-coupled roton can push down the energy of one long-range-interaction
+roton. The spin-orbit coupling accelerates the softening of this roton. The
+post phase of spin-orbit-coupling-assisted roton softening and instability is
+identified as a superstripe.",2003.10090v2
+2022-04-14,Double version of the Rashba and Dresselhaus spin-orbit coupling,"The Rashba and Dresselhaus types of spin-orbit coupling are two typical
+linear coupling forms. We establish the fundamental physics of a model which
+can be viewed as the double version of the Rashba and Dresselhaus spin-orbit
+coupling. This model describes the low energy physics of a class of massless
+Dirac fermions in spin-orbit systems. The physical properties of the massless
+Dirac fermions are determined by the mathematical relations of spin-orbit
+coefficients. For equal Rashba and Dresselhauss coupling constants,
+k-independent eigenspinors and a persistent spin helix combined with massless
+birefringent Dirac fermions emerge in this model. The spin-orbit coupled
+systems described by this model have potential technological applications from
+spintronics to quantum computation.",2204.06680v1
+2019-04-01,Spin-charge coupled transport in van der Waals systems with random tunneling,"We study the electron and spin transport in a van der Waals system formed by
+one layer with strong spin-orbit coupling and a second layer without spin-orbit
+coupling, in the regime when the interlayer tunneling is random. We find that
+in the layer without intrinsic spin-orbit coupling spin-charge coupled
+transport can be induced by two distinct mechanisms. First, the gapless
+diffusion modes of the two isolated layers hybridize in the presence of
+tunneling, which constitutes a source of spin-charge coupled transport in the
+second layer. Second, the random tunneling introduces spin-orbit coupling in
+the effective disorder-averaged single-particle Hamiltonian of the second
+layer. This results in non-trivial spin transport and, for sufficiently strong
+tunneling, in spin-charge coupling. As an example, we consider a van der Waals
+system formed by a two-dimensional electron gas (2DEG)--such as graphene--and
+the surface of a topological insulator (TI) and show that the proximity of the
+TI induces a coupling of the spin and charge transport in the 2DEG. In
+addition, we show that such coupling can be tuned by varying the doping of the
+TI's surface. We then obtain, for a simple geometry, the current-induced
+non-equilibrium spin accumulation (Edelstein effect) caused in the 2DEG by the
+coupling of charge and spin transport.",1904.01015v1
+2014-11-14,Spin-orbit coupling and chaotic rotation for eccentric coorbital bodies,"The presence of a co-orbital companion induces the splitting of the well
+known Keplerian spin-orbit resonances. It leads to chaotic rotation when those
+resonances overlap.",1411.3950v1
+2017-01-03,Universal Absence of Walker Breakdown and Linear Current-Velocity Relation via Spin-Orbit Torques in Coupled and Single Domain Wall Motion,"We consider theoretically domain wall motion driven by spin-orbit and spin
+Hall torques. We find that it is possible to achieve universal absence of
+Walker breakdown for all spin-orbit torques using experimentally relevant
+spin-orbit coupling strengths. For spin-orbit torques other than the pure
+Rashba spin-orbit torque, this gives a linear current-velocity relation instead
+of a saturation of the velocity at high current densities. The effect is very
+robust and is found in both soft and hard magnetic materials, as well as in the
+presence of the Dzyaloshinskii-Moriya interaction and in coupled domain walls
+in synthetic antiferromagnets, where it leads to very high domain wall
+velocities. Moreover, recent experiments have demonstrated that the switching
+of a synthetic antiferromagnet does not obey the usual spin Hall
+angle-dependence, but that domain expansion and contraction can be selectively
+controlled toggling only the applied in-plane magnetic field magnitude and not
+its sign. We show for the first time that the combination of spin Hall torques
+and interlayer exchange coupling produces the necessary relative velocities for
+this switching to occur.",1701.00786v2
+2024-04-09,Hydrostatic pressure control of the spin-orbit proximity effect and spin relaxation in a phosphorene-WSe$_2$ heterostructure,"Effective control of interlayer interactions is a key element in modifying
+the properties of van der Waals heterostructures and the next step toward their
+practical applications. Focusing on the phosphorene-WSe$_2$ heterostructure, we
+demonstrate, using first-principles calculations, how the spin-orbit coupling
+can be transferred from WSe$_2$, a strong spin-orbit coupling material, to
+phosphorene and further amplified by applying vertical pressure. We simulate
+external pressure by changing the interlayer distance between bilayer
+constituents and show that it is possible to tune the spin-orbit field of
+phosphorene holes in a controllable way. By fitting effective electronic states
+of the proposed Hamiltonian to the first principles data, we reveal that the
+spin-orbit coupling in phosphorene hole bands is enhanced more than two times
+for experimentally accessible pressures up to 17 kbar. Finally, we find that
+the pressure-enhanced spin-orbit coupling boosts the Dyakonov-Perel spin
+relaxation mechanism, reducing the spin lifetime of phosphorene holes by factor
+4.",2404.06097v1
+2019-03-08,Intra- and inter-orbital correlated electron spin dynamics in $\rm Sr_2 Ir O_4$: spin-wave gap and spin-orbit exciton,"Transformation of Coulomb interaction terms to the pseudo-orbital basis
+constituted by $J=1/2$ and $3/2$ states arising from spin-orbit coupling
+provides a versatile tool. This formalism is applied to investigate magnetic
+anisotropy effects on low-energy spin-wave excitations as well as high-energy
+spin-orbit exciton modes in $\rm Sr_2 Ir O_4$. The Hund's coupling term
+explictly yields easy-plane anisotropy, resulting in gapless (in-plane) and
+gapped (out-of-plane) modes, in agreement with recent resonant inelastic x-ray
+scattering (RIXS) measurements. The collective mode of inter-orbital,
+spin-flip, particle-hole excitations with appropriate interaction strengths and
+renormalized spin-orbit gap yields two well-defined propagating spin-orbit
+exciton modes, with energy scale and dispersion in good agreement with RIXS
+studies.",1903.03360v1
+2005-11-22,Entanglement production in chaotic quantum dots subject to spin-orbit coupling,"We study numerically the production of orbital and spin entangled states in
+chaotic quantum dots for non-interacting electrons. The introduction of
+spin-orbit coupling permit us to identify signatures of time-reversal symmetry
+correlations in the entanglement production previously unnoticed, resembling
+weak-(anti)localization quantum corrections to the conductance. We find the
+entanglement to be strongly dependent on spin-orbit coupling, showing universal
+features for broken time-reversal and spin-rotation symmetries.",0511555v3
+2007-07-30,Temperature Dependence of Rashba Spin-orbit Coupling in Quantum Wells,"We perform an all-optical spin-dynamic measurement of the Rashba spin-orbit
+interaction in (110)-oriented GaAs/AlGaAs quantum wells. The crystallographic
+direction of quantum confinement allows us to disentangle the contributions to
+spin-orbit coupling from the structural inversion asymmetry (Rashba term) and
+the bulk inversion asymmetry. We observe an unexpected temperature dependence
+of the Rashba spin-orbit interaction strength that signifies the importance of
+the usually neglected higher-order terms of the Rashba coupling.",0707.4493v1
+2007-08-19,Coupling of electron rotation with spin in semiconductors,"Account of an intrinsic spin-orbit coupling in the valence bands of common
+semiconductors yields the scalar spin-orbit-rotation term in the effective-mass
+Hamiltonian of the conduction-band electron. This result is obtained within the
+multiband envelope function approximation. Fundamentally, the
+spin-orbit-rotation coupling can be described in purely geometric terms as a
+consequence of the difference in the Berry phase acquired by the components of
+the spin-orbitally mixed Kramers-doublet during its cyclic evolution in the
+reciprocal momentum space.",0708.2565v2
+2019-09-01,Switchable Josephson current in junctions with spin-orbit coupling,"We study the Josephson current in two types of lateral junctions with
+spin-orbit coupling and an exchange field. The first system (type 1 junction)
+consists of superconductors with heavy metal interlayers linked by a
+ferromagnetic bridge, such that the spin-orbit coupling is finite only at the
+superconductor/heavy metal interface. In the second type (type 2) of system we
+assume that the spin orbit coupling is finite in the bridge region. The length
+of both junctions is larger than the magnetic decay length such that the
+Josephson current is carried uniquely by the long-range triplet component of
+the condensate. The latter is generated by the spin-orbit coupling via two
+mechanisms, spin precession and inhomogeneous spin-relaxation. We show that the
+current can be controlled by rotating the magnetization of the bridge or by
+tuning the strength of the spin-orbit coupling in type 2 junctions., and also
+discuss how the ground-state of the junction can be tuned from a $0$ to a $\pi$
+phase difference between the superconducting electrodes. In leading order in
+the spin-orbit coupling, the spin precession dominates the behavior of the
+triplet component and both
+  junctions behave similarly. However, when spin relaxation effects are
+included junction of type 2 offers a wider parameter range in which $0$-$\pi$
+transitions take place.",1909.00401v1
+2004-06-29,Spin current and polarization in impure 2D electron systems with spin-orbit coupling,"We derive the transport equations for two-dimensional electron systems with
+spin-orbit interaction and short-range spin-independent disorder. In the limit
+of slow spatial variations of the electron distribution we obtain coupled
+diffusion equations for the electron density and spin. Using these equations we
+calculate electric-field induced spin accumulation in a finite-size sample for
+arbitrary ratio between spin-orbit energy splitting and elastic scattering
+rate. We demonstrate that the spin-Hall conductivity vanishes in an infinite
+system independent of this ratio.",0406730v2
+2011-11-23,Rashba spin torque in an ultrathin ferromagnetic metal layer,"In a two-dimensional ferromagnetic metal layer lacking inversion symmetry,
+the itinerant electrons mediate the interaction between the Rashba spin-orbit
+interaction and the ferromagnetic order parameter, leading to a Rashba spin
+torque exerted on the magnetization. Using Keldysh technique, in the presence
+of both magnetism and a spin-orbit coupling, we derive a spin diffusion
+equation that provides a coherent description to the diffusive spin dynamics.
+The characteristics of the spin torque and its implication on magnetization
+dynamics are discussed in the limits of large and weak spin-orbit coupling.",1111.5466v1
+2016-08-07,Spin-orbit coupling in Fe-based superconductors,"We study the spin resonance peak in recently discovered iron-based
+superconductors. The resonance peak observed in inelastic neutron scattering
+experiments agrees well with predicted results for the extended $s$-wave
+($s_\pm$) gap symmetry. Recent neutron scattering measurements show that there
+is a disparity between longitudinal and transverse components of the dynamical
+spin susceptibility. Such breaking of the spin-rotational invariance in the
+spin-liquid phase can occur due to spin-orbit coupling. We study the role of
+the spin-orbit interaction in the multiorbital model for Fe-pnictides and show
+how it affects the spin resonance feature.",1608.02230v1
+1995-11-26,Spin-flip scattering in the quantum Hall regime,"We present a microscopic theory of spin-orbit coupling in the integer quantum
+Hall regime. The spin-orbit scattering length is evaluated in the limit of
+long-range random potential. The spin-flip rate is shown to be determined by
+rare fluctuations of anomalously high electric field. A mechanism of strong
+spin-orbit scattering associated with exchange-induced spontaneous
+spin-polarization is suggested. Scaling of the spin-splitting of the
+delocalization transition with the strength of spin-orbit and exchange
+interactions is also discussed.",9511123v2
+2013-04-09,Spin-orbital liquids in non-Kramers magnet on Kagome lattice,"Localized magnetic moments with crystal-field doublet or pseudo-spin 1/2 may
+arise in correlated insulators with even number of electrons and strong
+spin-orbit coupling. Such a non-Kramers pseudo-spin 1/2 is the consequence of
+crystalline symmetries as opposed to the Kramers doublet arising from
+time-reversal invariance, and is necessarily a composite of spin and orbital
+degrees of freedom. We investigate possible spin-orbital liquids with fermionic
+spinons for such non-Kramers pseudo-spin 1/2 systems on the Kagome lattice.
+Using the projective symmetry group analysis, we find {\it ten} new phases that
+are not allowed in the corresponding Kramers systems. These new phases are
+allowed due to unusual action of the time reversal operation on non-Kramers
+pseudo-spins. We compute the spin-spin dynamic structure factor that shows
+characteristic features of these non-Kramers spin-orbital liquids arising from
+their unusual coupling to neutrons, which is therefore relevant for neutron
+scattering experiments. We also point out possible anomalous broadening of
+Raman scattering intensity that may serve as a signature experimental feature
+for gapless non-Kramers spin-orbital liquids.",1304.2766v1
+2019-06-11,Spin imbalance of charge carriers induced by an electric current,"We analyze the contribution of the inhomogeneous magnetic field induced by an
+electrical current to the spin Hall effect in metals. The Zeeman coupling
+between the field and the electron spin leads to a spin dependent force, and to
+spin accumulation at the edges. We compare the effect of this relativistic
+correction to the electron dynamics to the features induced by the spin-orbit
+interaction. The effect of current induced magnetic fields on the spin Hall
+effect can be comparable to the extrinsic contribution from the spin-orbit
+interaction, although it does not require the presence of heavy elements with a
+strong spin-orbit interaction. The induced spins are oriented normal to the
+metal slab.",1906.04851v1
+2011-10-24,Manipulation of single electron spin in a GaAs quantum dot through the application of geometric phases: The Feynman disentangling technique,"The spin of a single electron in an electrically defined quantum dot in a
+2DEG can be manipulated by moving the quantum dot adiabatically in a closed
+loop in the 2D plane under the influence of applied gate potentials. In this
+paper we present analytical expressions and numerical simulations for the
+spin-flip probabilities during the adiabatic evolution in the presence of the
+Rashba and Dresselhaus linear spin-orbit interactions. We use the Feynman
+disentanglement technique to determine the non-Abelian Berry phase and we find
+exact analytical expressions for three special cases: (i) the pure Rashba
+spin-orbit coupling, (ii) the pure Dresselhause linear spin-orbit coupling, and
+(iii) the mixture of the Rashba and Dresselhaus spin-orbit couplings with equal
+strength. For a mixture of the Rashba and Dresselhaus spin-orbit couplings with
+unequal strengths, we obtain simulation results by solving numerically the
+Riccati equation originating from the disentangling procedure. We find that the
+spin-flip probability in the presence of the mixed spin-orbit couplings is
+generally larger than those for the pure Rashba case and for the pure
+Dresselhaus case, and that the complete spin-flip takes place only when the
+Rashba and Dresselhaus spin-orbit couplings are mixed symmetrically.",1110.5366v1
+2022-02-10,Local breaking of the spin degeneracy in the vortex states of Ising superconductors: Induced antiphase ferromagnetic order,"Ising spin-orbital coupling is usually easy to identify in the Ising
+superconductors via an in-plane critical field enhancement, but we show that
+the Ising spin-orbital coupling also manifests in the vortex physics for
+perpendicular magnetic fields. By self-consistently solving the Bogoliubov-de
+Gennes equations of a model Hamiltonian built on the honeycomb lattice with the
+Ising spin-orbital coupling pertinent to the transition metal dichalcogenides,
+we numerically investigate the local breaking of the spin and sublattice
+degeneracies in the presence of a perpendicular magnetic field. It is revealed
+that the ferromagnetic orders are induced inside the vortex core region by the
+Ising spin-orbital coupling. The induced magnetic orders are antiphase in terms
+of their opposite polarizations inside the two nearest-neighbor vortices with
+one of the two polarizations coming dominantly from one sublattice sites,
+implying the local breaking of the spin and sublattice degeneracies. The
+finite-energy peaks of the local-density-of-states for spin-up and spin-down
+in-gap states are split and shifted oppositely by the Ising spin-orbital
+coupling, and the relative shifts of them on sublattices $A$ and $B$ are also
+of opposite algebraic sign. The calculated results and the proposed scenario
+may not only serve as experimental signatures for identifying the Ising
+spin-orbital coupling in the Ising superconductors, but also be prospective in
+manipulation of electron spins in motion through the orbital effect in the
+superconducting vortex states.",2202.04797v1
+2011-01-27,Magnetic excitations in one-dimensional spin-orbital models,"We study the dynamics and thermodynamics of one-dimensional spin-orbital
+models relevant for transition metal oxides. We show that collective spin,
+orbital, and combined spin-orbital excitations with infinite lifetime can
+exist, if the ground state of both sectors is ferromagnetic. Our main focus is
+the case of effectively ferromagnetic (antiferromagnetic) exchange for the spin
+(orbital) sector, respectively, and we investigate the renormalization of spin
+excitations via spin-orbital fluctuations using a boson-fermion representation.
+We contrast a mean-field decoupling approach with results obtained by treating
+the spin-orbital coupling perturbatively. Within the latter self-consistent
+approach we find a significant increase of the linewidth and additional
+structures in the dynamical spin structure factor as well as Kohn anomalies in
+the spin-wave dispersion caused by the scattering of spin excitations from
+orbital fluctuations. Finally, we analyze the specific heat c(T) by comparing a
+numerical solution of the model obtained by the density-matrix renormalization
+group with perturbative results. At low temperatures T we find numerically c(T)
+T pointing to a low-energy effective theory with dynamical critical exponent
+z=1.",1101.5301v1
+2016-10-05,Exotic orbits due to spin-spin coupling around Kerr black holes,"We report exotic orbital phenomena of spinning test particles orbiting around
+a Kerr black hole, i.e., some orbits of spinning particles are asymmetrical
+about the equatorial plane. When a nonspinning test particle orbits around a
+Kerr black hole in a strong field region, due to relativistic orbital
+precessions, the pattern of trajectories is symmetrical about the equatorial
+plane of the Kerr black hole. However, the patterns of the spinning particles'
+orbit are no longer symmetrical about the equatorial plane for some orbital
+configurations and large spins. We argue that these asymmetrical patterns come
+from the spin-spin interactions between spinning particles and Kerr black
+holes, because the directions of spin-spin forces can be arbitrary, and
+distribute asymmetrically about the equatorial plane.",1610.01534v3
+2023-11-01,Theory of Orbital Pumping,"We develop a theory of orbital pumping, which corresponds to the emission of
+orbital currents from orbital dynamics. This phenomenon exhibits two distinct
+characteristics compared to spin pumping. Firstly, while spin pumping generates
+solely spin (angular momentum) currents, orbital pumping yields both orbital
+angular momentum currents and orbital angular position currents. Secondly,
+lattice vibrations induce orbital dynamics and associated orbital pumping as
+the orbital angular position is directly coupled to the lattice. These pumped
+orbital currents can be detected as transverse electric voltages via the
+inverse orbital(-torsion) Hall effect, stemming from orbital textures. Our work
+proposes a new avenue for generating orbital currents and provides a broader
+understanding of angular momentum dynamics encompassing spin, orbital, and
+phonon.",2311.00362v1
+2016-06-18,Spin Transport at Interfaces with Spin-Orbit Coupling: Formalism,"We generalize magnetoelectronic circuit theory to account for spin transfer
+to and from the atomic lattice via interfacial spin-orbit coupling. This
+enables a proper treatment of spin transport at interfaces between a
+ferromagnet and a heavy-metal non-magnet. This generalized approach describes
+spin transport in terms of drops in spin and charge accumulations across the
+interface (as in the standard approach), but additionally includes the
+responses from in-plane electric fields and offsets in spin accumulations. A
+key finding is that in-plane electric fields give rise to spin accumulations
+and spin currents that can be polarized in any direction, generalizing the
+Rashba-Edelstein and spin Hall effects. The spin accumulations exert torques on
+the magnetization at the interface when they are misaligned from the
+magnetization. The additional out-of-plane spin currents exert torques via the
+spin-transfer mechanism on the ferromagnetic layer. To account for these
+phenomena we also describe spin torques within the generalized circuit theory.
+The additional effects included in this generalized circuit theory suggest
+modifications in the interpretations of experiments involving spin orbit
+torques, spin pumping, spin memory loss, the Rashba-Edelstein effect, and the
+spin Hall magnetoresistance.",1606.05758v1
+2020-03-27,Generalized magnetoelectronic circuit theory and spin relaxation at interfaces in magnetic multilayers,"Spin transport at metallic interfaces is an essential ingredient of various
+spintronic device concepts, such as giant magnetoresistance, spin-transfer
+torque, and spin pumping. Spin-orbit coupling plays an important role in many
+such devices. In particular, spin current is partially absorbed at the
+interface due to spin-orbit coupling. We develop a general magnetoelectronic
+circuit theory and generalize the concept of the spin mixing conductance,
+accounting for various mechanisms responsible for spin-flip scattering. For the
+special case when exchange interactions dominate, we give a simple expression
+for the spin mixing conductance in terms of the contributions responsible for
+spin relaxation (i.e., spin memory loss), spin torque, and spin precession. The
+spin-memory loss parameter $\delta$ is related to spin-flip transmission and
+reflection probabilities. There is no straightforward relation between spin
+torque and spin memory loss. We calculate the spin-flip scattering rates for
+N|N, F|N, F|F interfaces using the Landauer-B\""uttiker method within the linear
+muffin-tin orbital method and determine the values of $\delta$ using circuit
+theory.",2003.12221v1
+2015-11-03,Spin-Orbit Coupling Induced Back-action Cooling in Cavity-Optomechanics with a Bose-Einstein Condensate,"We report a spin-orbit coupling induced back-action cooling in an
+optomechanical system, composed of a spin-orbit coupled Bose-Einstein
+condensate trapped in an optical cavity with one movable end mirror, by
+suppressing heating effects of quantum noises. The collective density
+excitations of the spin-orbit coupling mediated hyperfine states - serving as
+atomic oscillators equally coupled to the cavity field - trigger strongly
+driven atomic back-action. We find that the back-action not only revamps
+low-temperature dynamics of its own but also provides an opportunity to cool
+the mechanical mirror to its quantum mechanical ground state. Further, we
+demonstrate that the strength of spin-orbit coupling also superintends dynamic
+structure factor and squeezes nonlinear quantum noises, like thermo-mechanical
+and photon shot noise, which enhances optomechanical features of hybrid cavity
+beyond the previous investigations. Our findings are testable in a realistic
+setup and enhance the functionality of cavity-optomechanics with spin-orbit
+coupled hyperfine states in the field of quantum optics and quantum
+computation.",1511.01109v2
+2008-06-03,Spin-Orbit Coupling in an f-electron Tight-Binding Model,"We extend a tight-binding method to include the effects of spin-orbit
+coupling, and apply it to the study of the electronic properties of the
+actinide elements Th, U, and Pu. These tight-binding parameters are determined
+for the fcc crystal structure using the equivalent equilibrium volumes. In
+terms of the single particle energies and the electronic density of states, the
+overall quality of the tight-binding representation is excellent and of the
+same quality as without spin-orbit coupling. The values of the optimized
+tight-binding spin-orbit coupling parameters are comparable to those determined
+from purely atomic calculations.",0806.0420v1
+2011-07-04,Anomalous Hall conductivity from the dipole mode of spin-orbit-coupled cold-atom systems,"Motivated by recent experiments [Lin {\it et al.}, Nature {\bf 417}, 83
+(2011)] that engineered spin-orbit coupling in ultra-cold mixtures of bosonic
+atoms, we study the dipole oscillation of trapped spin-orbit-coupled
+non-condensed Bose and Fermi gases. We find that different directions of
+oscillation are coupled by the spin-orbit interactions. The phase difference
+between oscillatory motion in orthogonal directions and the trapping
+frequencies of the modes are shown to be related to the anomalous Hall
+conductivity. Our results can be used to experimentally determine the anomalous
+Hall conductivity for cold-atom systems.",1107.0578v1
+2011-08-10,"Erratum: Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials [Phys. Rev. B 83, 184520 (2011)]","In this erratum, we revisit the issue of bulk-disorder on proposals to
+realize an effective p+ip superconductor from spin-orbit coupled materials.
+Contrary to the claim in [Phys. Rev. B 83, 184520 (2011)], we show that the
+pair breaking effects of bulk-disorder are negligible, and that bulk disorder
+does not suppress the induced superconductivity. This argument does not apply
+to our conclusions regarding impurities residing in the spin-orbit coupled
+material or disorder at the interface to the bulk superconductor, both of which
+tend to suppress superconductivity unless spin-orbit coupling is large.",1108.2260v1
+2013-01-16,Vortex lattice solutions to the Gross-Pitaevskii equation with spin-orbit coupling in optical lattices,"Effective spin-orbit coupling can be created in cold atom systems using
+atom-light interaction. We study the BECs in an optical lattice using the
+Gross-Pitaevskii equation with spin-orbit coupling. Bloch states for the linear
+equation are numerically obtained, and compared with stationary solutions to
+the Gross-Pitaevskii equation with nonlinear terms. Various vortex lattice
+states are found when the spin-orbit coupling is strong.",1301.3565v1
+2018-11-22,Enhanced Rashba spin-orbit coupling in core-shell nanowires by the interfacial effect,"We report on $\vec{k}\cdot\vec{p}$ calculations of Rashba spin-orbit coupling
+controlled by external gates in InAs/InAsP core-shell nanowires. We show that
+charge spilling in the barrier material allows for a stronger symmetry breaking
+than in homoegenous nano-materials, inducing a specific interface-related
+contribution to spin-orbit coupling. Our results qualitatively agree with
+recent experiments [S. Futhemeier \textit{et al.}, Nat. Commun. \textbf{7},
+12413 (2016)] and suggest additional wavefunction engineering strategies to
+enhance and control spin-orbit coupling.",1811.09088v1
+2017-01-17,Vortex pairs in a spin-orbit coupled Bose-Einstein condensate,"Static and dynamic properties of vortices in a two-component Bose-Einstein
+condensate with Rashba spin-orbit coupling are investigated. The mass current
+around a vortex core in the plane-wave phase is found to be deformed by the
+spin-orbit coupling, and this makes the dynamics of the vortex pairs quite
+different from those in a scalar Bose-Einstein condensate. The velocity of a
+vortex-antivortex pair is much smaller than that without spin-orbit coupling,
+and there exist stationary states. Two vortices with the same circulation move
+away from each other or unite to form a stationary state.",1701.04591v1
+2023-07-22,Spin-orbit-coupling-induced phase separation in trapped Bose gases,"In a trapped spin-1/2 Bose-Einstein condensate with miscible interactions, a
+two-dimensional spin-orbit coupling can introduce an unconventional spatial
+separation between the two components. We reveal the physical mechanism of such
+a spin-orbit-coupling-induced phase separation. Detailed features of the phase
+separation are identified in a trapped Bose-Einstein condensate. We further
+analyze differences of phase separation in Rashba and anisotropic
+spin-orbit-coupled Bose gases. An adiabatic splitting dynamics is proposed as
+an application of the phase separation.",2307.12177v2
+2000-06-30,On a q-analogue of the spin-orbit coupling,"Based on the tensor method, a q-analoque of the spin-orbit coupling is
+introduced in a q-deformed Schroedinger equation, previously derived for a
+central potential. Analytic expressions for the matrix elemnets of the
+representation j=l\pm 1/2 are derived. The spectra of the harmonic oscillator
+and the Coulomb potential are calculated numerically as a function of the
+deformation parameter, without and with the spin-orbit coupling. The harmonic
+oscillator spectrum presents strong analogies with the bound spectrum of an
+Woods-Saxon potential customarily used in nuclear physics. The Coulomb spectrum
+simulates relativistic effects. The addition of the spin-orbit coupling
+reinforces this picture.",0006081v1
+2011-10-28,Artificial spin-orbit coupling in ultra-cold Fermi superfluids,"We develop a theory for interacting fermions in the presence of spin-orbit
+coupling and Zeeman fields, and show that many new superfluids phases, which
+are topological in nature, emerge. Depending on values of spin-orbit coupling,
+Zeeman fields, and interactions, initially gapped s-wave superfluids acquire
+p-wave, d-wave, f-wave and higher angular momentum components, which produce
+zeros in the excitation spectrum, rendering the superfluid gapless. Several
+multi-critical points, which separate topological superfluid phases from normal
+or non-uniform, are accessible depending on spin-orbit coupling, Zeeman fields
+or interactions, setting the stage for the study of tunable topological
+superfluids.",1110.6364v1
+2014-01-03,Spin-Orbit Coupled Bose Gases at Finite Temperatures,"Spin-orbit coupling is predicted to have dramatic effects on thermal
+properties of a two-component atomic Bose gas. We show that in three spatial
+dimensions it lowers the critical temperature of condensation and enhances
+thermal depletion of the condensate fraction. In two dimensions we show that
+spin-orbit coupling destroys superfluidity at any finite temperature, modifying
+dramatically the cerebrated Berezinskii-Kosterlitz-Thouless scenario. We
+explain this by the increase of the number of low energy states induced by
+spin-orbit coupling, enhancing the role of quantum fluctuations.",1401.0575v1
+2021-09-07,Creating moving gap solitons in spin-orbit-coupled Bose-Einstein condensates,"A simple and efficient method to create gap solitons is proposed in a
+spin-orbit-coupled spin-1 Bose-Einstein condensate. We find that a free
+expansion along the spin-orbit coupling dimension can generate two moving gap
+solitons, which are identified from a generalized massive Thirring model. The
+dynamics of gap solitons can be controlled by adjusting spin-orbit coupling
+parameters.",2109.02871v1
+2023-02-10,Patterning by dynamically unstable spin-orbit-coupled Bose-Einstein condensates,"In a two-dimensional atomic Bose-Einstein condensate, we demonstrate Rashba
+spin-orbit coupling can always introduce dynamical instability into specific
+zero-quasimomentum states in all parameter regimes. During the evolution of the
+zero-quasimomentum states, such spin-orbit-coupling-induced instability can
+fragment the states and lead to a dynamically patterning process.
+  The features of formed patterns are identified from the symmetries of the
+Bogoliubov-de Gennes Hamiltonian. We show that spin-orbit-coupled Bose-Einstein
+condensates provide an interesting platform for the investigation of pattern
+formations.",2302.05101v2
+2017-05-12,Analytical slave-spin mean-field approach to orbital selective Mott insulators,"We use the slave-spin mean-field approach to study particle-hole symmetric
+one- and two-band Hubbard models in presence of Hund's coupling interaction. By
+analytical analysis of Hamiltonian, we show that the locking of the two
+orbitals vs.\,orbital-selective Mott transition can be formulated within a
+Landau-Ginzburg framework. By applying the slave-spin mean-field to impurity
+problem, we are able to make a correspondence between impurity and lattice. We
+also consider the stability of the orbital selective Mott phase to the
+hybridization between the orbitals and study the limitations of the slave-spin
+method for treating inter-orbital tunnellings in the case of multi-orbital
+Bethe lattices with particle-hole symmetry.",1705.04427v1
+2014-11-11,Striped Ferronematic ground states in a spin-orbit coupled $S=1$ Bose gas,"We theoretically establish the mean-field phase diagram of a homogeneous
+spin-$1$, spin-orbit coupled Bose gas as a function of the spin-dependent
+interaction parameter, the Raman coupling strength and the quadratic Zeeman
+shift. We find that the interplay between spin-orbit coupling and
+spin-dependent interactions leads to the occurrence of ferromagnetic or
+ferronematic phases which also break translational symmetry. For weak Raman
+coupling, increasing attractive spin-dependent interactions (as in $^{87}$Rb or
+$^7$Li) induces a transition from a uniform to a stripe XY ferromagnet (with no
+nematic order). For repulsive spin-dependent interactions however (as in
+$^{23}$Na), we find a transition from an $XY$ spin spiral phase ($<S_{z} >= 0$
+and uniform total density) with uniaxial nematic order, to a biaxial
+ferronematic, where the total density, spin vector and nematic director
+oscillate in real space. We investigate the stability of these phases against
+the quadratic Zeeman effect, which generally tends to favor uniform phases with
+either ferromagnetic or nematic order but not both. We discuss the relevance of
+our results to ongoing experiments on spin-orbit coupled, spinor Bose gases.",1411.2990v1
+2018-12-21,Influence of spin-orbit and spin-Hall effects on the spin Seebeck current beyond linear response,"We study the spin transport theoretically in heterostructures consisting of a
+ferromagnetic metallic thin film sandwiched between heavy-metal and oxide
+layers. The spin current in the heavy metal layer is generated via the spin
+Hall effect, while the oxide layer induces at the interface with the
+ferromagnetic layer a spin-orbital coupling of the Rashba type. Impact of the
+spin Hall effect and Rashba spin-orbit coupling on the spin Seebeck current is
+explored with a particular emphasis on nonlinear effects. Technically, we
+employ the Fokker-Planck approach and contrast the analytical expressions with
+full numerical micromagnetic simulations. We show that when an external
+magnetic field is aligned parallel (antiparallel) to the Rashba field, the
+spin-orbit coupling enhances (reduces) the spin pumping current. In turn, the
+spin Hall effect and the Dzyaloshinskii-Moriya interaction are shown to
+increase the spin pumping current.",1812.09270v1
+1998-12-16,Elementary excitations of magnetically ordered systems with orbital degeneracy,"The Holstein-Primakoff transformation is generalized to develop a quantum
+flavor wave theory for spin systems with orbital degeneracy. Elementary
+excitations consist of spin, orbital, and spin-orbital waves. Spin and
+spin-orbital waves couple each other due to orbital anisotropy and Hund's rule,
+resulting in new modes observable by inelastic neutron scattering. In the SU(4)
+limit, flavor waves are dispersionless along one or more directions, and give
+rise to quantum fluctuations of reduced dimensionality.",9812289v1
+2011-10-01,Spin-orbital phase synchronization in the magnetic field-driven electron dynamics in a double quantum dot,"We study the dynamics of an electron confined in a one-dimensional double
+quantum dot in the presence of driving external magnetic fields. The orbital
+motion of the electron is coupled to the spin dynamics by spin orbit
+interaction of the Dresselhaus type. We derive an effective time-dependent
+Hamiltonian model for the orbital motion of the electron and obtain a
+synchronization condition between the orbital and the spin dynamics. From this
+model we deduce an analytical expression for the Arnold tongue and propose an
+experimental scheme for realizing the synchronization of the orbital and spin
+dynamics.",1110.0114v1
+2013-01-16,Mechanical generation of spin current by spin-rotation coupling,"Spin-rotation coupling, which is responsible for angular momentum conversion
+between the electron spin and rotational deformations of elastic media, is
+exploited for generating spin current. This method requires neither magnetic
+moments nor spin-orbit interaction. The spin current generated in nonmagnets is
+calculated in presence of surface acoustic waves. We solve the spin diffusion
+equation, extended to include spin-rotation coupling, and find that larger spin
+currents can be obtained in materials with longer spin lifetimes. Spin
+accumulation induced on the surface is predicted to be detectable by
+time-resolved Kerr spectroscopy.",1301.3596v1
+2009-10-30,Gravitational waveforms from unequal-mass binaries with arbitrary spins under leading order spin-orbit coupling,"The paper generalizes the structure of gravitational waves from orbiting
+spinning binaries under leading order spin-orbit coupling, as given in the work
+by K\""onigsd\""orffer and Gopakumar [PRD 71, 024039 (2005)] for single-spin and
+equal-mass binaries, to unequal-mass binaries and arbitrary spin
+configurations. The orbital motion is taken to be quasi-circular and the
+fractional mass difference is assumed to be small against one. The emitted
+gravitational waveforms are given in analytic form.",0910.5931v2
+2022-04-15,Quantum phases of spin-orbital-angular-momentum coupled bosonic gases in optical lattices,"Spin-orbit coupling plays an important role in understanding exotic quantum
+phases. In this work, we present a scheme to combine
+spin-orbital-angular-momentum (SOAM) coupling and strong correlations in
+ultracold atomic gases. Essential ingredients of this setting is the interplay
+of SOAM coupling and Raman-induced spin-flip hopping, engineered by lasers that
+couples different hyperfine spin states. In the presence of SOAM coupling only,
+we find rich quantum phases in the Mott-insulating regime, which support
+different types of spin defects such as spin vortex and composite vortex with
+antiferromagnetic core surrounded by the outer spin vortex. Based on an
+effective exchange model, we find that these competing spin textures are a
+result of the interplay of Dzyaloshinskii-Moriya and Heisenberg exchange
+interactions. In the presence of both SOAM coupling and Raman-induced spin-flip
+hopping, more many-body phases appear, including canted-antiferromagnetic and
+stripe phases. Our prediction suggests that SOAM coupling could induce rich
+exotic many-body phases in the strongly interacting regime.",2204.07323v2
+2017-08-24,Strong influence of spin-orbit coupling on magnetotransport in two-dimensional hole systems,"With a view to electrical spin manipulation and quantum computing
+applications, recent significant attention has been devoted to semiconductor
+hole systems, which have very strong spin-orbit interactions. However,
+experimentally measuring, identifying, and quantifying spin-orbit coupling
+effects in transport, such as electrically-induced spin polarizations and
+spin-Hall currents, are challenging. Here we show that the magnetotransport
+properties of two dimensional (2D) hole systems display strong signatures of
+the spin-orbit interaction. Specifically, the low-magnetic field Hall
+coefficient and longitudinal conductivity contain a contribution that is second
+order in the spin-orbit interaction coefficient and is non-linear in the
+carrier number density. We propose an appropriate experimental setup to probe
+these spin-orbit dependent magnetotransport properties, which will permit one
+to extract the spin-orbit coefficient directly from the magnetotransport.",1708.07247v2
+2018-07-13,Spin-orbit coupling and correlations in three-orbital systems,"We investigate the influence of spin-orbit coupling $\lambda$ in
+strongly-correlated multiorbital systems that we describe by a three-orbital
+Hubbard-Kanamori model on a Bethe lattice. We solve the problem at all integer
+fillings $N$ with the dynamical mean-field theory using the continuous-time
+hybridization expansion Monte Carlo solver. We investigate how the
+quasiparticle renormalization $Z$ varies with the strength of spin-orbit
+coupling. The behavior can be understood for all fillings except $N=2$ in terms
+of the atomic Hamiltonian (the atomic charge gap) and the polarization in the
+$j$-basis due to spin-orbit induced changes of orbital degeneracies and the
+associated kinetic energy. At $N=2$, $\lambda$ increases $Z$ at small $U$ but
+suppresses it at large $U$, thus eliminating the characteristic Hund's metal
+tail in $Z(U)$. We also compare the effects of the spin-orbit coupling to the
+effects of a tetragonal crystal field. Although this crystal field also lifts
+the orbital degeneracy, its effects are different, which can be understood in
+terms of the different form of the interaction Hamiltonian expressed in the
+respective diagonal single-particle basis.",1807.05106v2
+2013-06-28,"The role of orbital order in the stabilization of the $(π,0)$ ordered magnetic state in a minimal two-band model for iron pnictides","Spin wave excitations and stability of the ($\pi,0$) ordered magnetic state
+are investigated in a minimal two-band itinerant-electron model for iron
+pnictides. Presence of hopping anisotropy generates a strong ferro-orbital
+order in the $d_{xz}$ and $d_{yz}$ Fe orbitals. The orbital order sign is as
+observed in experiments. The induced ferro-orbital order strongly enhances the
+spin wave energy scale and stabilizes the magnetic state by optimizing the
+strength of the emergent AF and F spin couplings through optimal band fillings
+in the two orbitals. The calculated spin-wave dispersion is in quantitative
+agreement with neutron scattering measurements. Finite inter-orbital Hund's
+coupling is shown to further enhance the spin wave energies state by coupling
+the two magnetic sub-systems. A more realistic two-band model with less hopping
+anisotropy is also considered which yields not only the circular hole pockets,
+also correct ferro-orbital order and emergent F spin coupling.",1306.6727v2
+2024-02-02,Photonic Spin-Orbit Coupling Induced by Deep-Subwavelength Structured Light,"We demonstrate both theoretically and experimentally beam-dependent photonic
+spin-orbit coupling in a two-wave mixing process described by an equivalent of
+the Pauli equation in quantum mechanics. The considered structured light in the
+system is comprising a superposition of two orthogonal spin-orbit-coupled
+states defined as spin up and spin down equivalents. The spin-orbit coupling is
+manifested by prominent pseudo spin precession as well as
+spin-transport-induced orbital angular momentum generation in a photonic
+crystal film of wavelength thickness. The coupling effect is significantly
+enhanced by using a deep-subwavelength carrier envelope, different from
+previous studies which depend on materials. The beam-dependent coupling effect
+can find intriguing applications; for instance, it is used in precisely
+measuring variation of light with spatial resolution up to 15 nm.",2402.01080v1
+2018-01-09,Inverse engineering for fast transport and spin control of spin-orbit-coupled Bose-Einstein condensates in moving harmonic traps,"We investigate fast transport and spin manipulation of tunable
+spin-orbit-coupled Bose-Einstein condensates in a moving harmonic trap.
+Motivated by the concept of ""shortcuts to adiabaticity"", we design inversely
+the time-dependent trap position and spin-orbit coupling strength. By choosing
+appropriate boundary conditions we obtain fast transport and spin flip
+simultaneously. The non-adiabatic transport and relevant spin dynamics are
+illustrated with numerical examples, and compared with the adiabatic transport
+with constant spin-orbit-coupling strength and velocity. Moreover, the
+influence of nonlinearity induced by interatomic interaction is discussed in
+terms of the Gross-Pitaevskii approach, showing the robustness of the proposed
+protocols. With the state-of-the-art experiments, such inverse engineering
+technique paves the way for coherent control of spin-orbit-coupled
+Bose-Einstein condensates in harmonic traps.",1801.02887v1
+2019-08-03,Experimental evidence for Zeeman spin-orbit coupling in layered antiferromagnetic conductors,"Most of solid-state spin physics arising from spin-orbit coupling, from
+fundamental phenomena to industrial applications, relies on symmetry-protected
+degeneracies. So does the Zeeman spin-orbit coupling, expected to manifest
+itself in a wide range of antiferromagnetic conductors. Yet, experimental proof
+of this phenomenon has been lacking. Here, we demonstrate that the N\'eel state
+of the layered organic superconductor $\kappa$-(BETS)$_2$FeBr$_4$ shows no spin
+modulation of the Shubnikov-de Haas oscillations, contrary to its paramagnetic
+state. This is unambiguous evidence for the spin degeneracy of Landau levels, a
+direct manifestation of the Zeeman spin-orbit coupling. Likewise, we show that
+spin modulation is absent in electron-doped Nd$_{1.85}$Ce$_{0.15}$CuO$_4$,
+which evidences the presence of N\'eel order in this cuprate superconductor
+even at optimal doping. Obtained on two very different materials, our results
+demonstrate the generic character of the Zeeman spin-orbit coupling.",1908.01236v2
+2018-03-14,Inter-orbital topological superconductivity in spin-orbit coupled superconductors with inversion symmetry breaking,"We study the superconducting state of multi-orbital spin-orbit coupled
+systems in the presence of an orbitally driven inversion asymmetry assuming
+that the inter-orbital attraction is the dominant pairing channel. Although the
+inversion symmetry is absent, we show that superconducting states that avoid
+mixing of spin-triplet and spin-singlet configurations are allowed, and
+remarkably, spin-triplet states that are topologically nontrivial can be
+stabilized in a large portion of the phase diagram. The orbital-dependent
+spin-triplet pairing generally leads to topological superconductivity with
+point nodes that are protected by a nonvanishing winding number. We demonstrate
+that the disclosed topological phase can exhibit Lifshitz-type transitions upon
+different driving mechanisms and interactions, e.g., by tuning the strength of
+the atomic spin-orbit and inversion asymmetry couplings or by varying the
+doping and the amplitude of order parameter. Such distinctive signatures of the
+nodal phase manifest through an extraordinary reconstruction of the low-energy
+excitation spectra both in the bulk and at the edge of the superconductor.",1803.05158v2
+2011-12-02,The contribution of spin torque to spin Hall coefficient and spin motive force in spin-orbit coupling system,"We derive rigorously the relativistic angular momentum conservation equation
+by means of quantum electrodynamics. The novel nonrelativistic spin current and
+torque in the spin-orbit coupling system, up to the order of $1/c^{4}$, are
+exactly investigated by using Foldy-Wouthuysen transformation. We find a
+perfect spin Hall coefficient including the contribution of spin torque dipole.
+A novel spin motive force, analogue to the Lorentz force, is also obtained for
+understanding of the spin Hall effect.",1112.0394v1
+2005-09-23,Physical Limits of the ballistic and non-ballistic Spin-Field-Effect Transistor: Spin Dynamics in Remote Doped Structures,"We investigate the spin dynamics and relaxation in remotely-doped two
+dimensional electron systems where the dopants lead to random fluctuations of
+the Rashba spin-orbit coupling. Due to the resulting random spin precession,
+the spin relaxation time is limited by the strength and spatial scale of the
+random contribution to the spin-orbit coupling. We concentrate on the role of
+the randomness for two systems where the direction of the spin-orbit field does
+not depend on the electron momentum: the spin field-effect transistor with
+balanced Rashba and Dresselhaus couplings and the (011) quantum well. Both of
+these systems are considered as promising for the spintronics applications
+because of the suppression of the Dyakonov-Perel' mechanism there makes the
+realization of a spin field effect transistor in the diffusive regime possible.
+We demonstrate that the spin relaxation through the randomness of spin-orbit
+coupling imposes important physical limitations on the operational properties
+of these devices.",0509611v1
+2016-08-23,The effect of spin-orbit coupling on the effective-spin correlation in YbMgGaO4,"Motivated by the recent experiments on the triangular lattice spin liquid
+YbMgGaO$_4$, we explore the effect of spin-orbit coupling on the effective-spin
+correlation of the Yb local moments. We point out the anisotropic interaction
+between the effective-spins on the nearest neighbor bonds is sufficient to
+reproduce the spin-wave dispersion of the fully polarized state in the presence
+of strong magnetic field normal to the triangular plane. We further evaluate
+the effective-spin correlation within the mean-field spherical approximation.
+We explicitly demonstrate that, the nearest-neighbor anisotropic effective-spin
+interaction, originating from the strong spin-orbit coupling, enhances the
+effective-spin correlation at the M points in the Brillouin zone. We identify
+these results as the strong evidence for the anisotropic interaction and the
+strong spin-orbit coupling in YbMgGaO$_4$.",1608.06445v2
+2024-01-27,Interplay of altermagnetism and weak ferromagnetism in two-dimensional RuF$_4$,"Gaining growing attention in spintronics is a class of magnets displaying
+zero net magnetization and spin-split electronic bands called altermagnets.
+Here, by combining density functional theory and symmetry analysis, we show
+that RuF$_4$ monolayer is a two-dimensional $d$-wave altermagnet. Spin-orbit
+coupling leads to pronounced spin splitting of the electronic bands at the
+$\Gamma$ point by $\sim 100$ meV and turns the RuF$_4$ into a weak ferromagnet
+due to non trivial spin-momentum locking that cants the Ru magnetic moments.
+The net magnetic moment scales linearly with the spin-orbit coupling strength.
+Using group theory we derive an effective spin Hamiltonian capturing the
+spin-splitting and spin-momentum locking of the electronic bands.
+Disentanglement of the altermagnetic and spin-orbit coupling induced spin
+splitting uncovers to which extent the altermagnetic properties are affected by
+the spin-orbit coupling. Our results move the spotlight to the non trivial
+spin-momentum locking and weak ferromagnetism in the two-dimensional
+altermagnets relevant for novel venues in this emerging field of material
+science research.",2401.15424v1
+2012-11-09,Interaction induced staggered spin-orbit order in two-dimensional electron gas,"We propose and formulate an interaction induced staggered spin-orbit order as
+a new emergent phase of two-dimensional Fermi gases. We show that when some
+form of inherent spin-splitting via Rashba-type spin-orbit coupling renders two
+helical Fermi surfaces to become significantly `nested', a Fermi surface
+instability arises. To lift this degeneracy, a spontaneous symmetry breaking
+spin-orbit density wave develops, causing a surprisingly large quasiparticle
+gapping with chiral electronic states. Since the staggered spin-orbit order is
+associated with a condensation energy, quantified by the gap value, destroying
+such spin-orbit interaction costs sufficiently large perturbation field or
+temperature or de-phasing time. BiAg$_2$ surface state is shown to be a
+representative system for realizing such novel spin-orbit interaction with
+tunable and large strength, and the spin-splitting is decoupled from charge
+excitations. These functional properties are relevant for spin-electronics,
+spin-caloritronics, and spin-Hall effect applications.",1211.2018v1
+2011-07-13,BCS-BEC crossover in spin-orbit coupled two-dimensional Fermi gases,"The recent experimental realization of spin-orbit coupling for ultra-cold
+atoms has generated much interest in the physics of spin-orbit coupled
+degenerate Fermi gases. Although recently the BCS-BEC crossover in
+three-dimensional (3D) spin-orbit coupled Fermi gases has been intensively
+studied, the corresponding two-dimensional (2D) crossover physics has remained
+unexplored. In this paper, we investigate, both numerically and analytically,
+the BCS-BEC crossover physics in 2D degenerate Fermi gases in the presence of a
+Rashba type of spin-orbit coupling. We derive the mean field gap and atom
+number equations suitable for the 2D spin-orbit coupled Fermi gases and solve
+them numerically and self-consistently, from which the dependence of the ground
+state properties (chemical potential, superfluid pairing gap, ground state
+energy per atom) on the system parameters (e.g., binding energy, spin-orbit
+coupling strength) is obtained. Furthermore, we derive analytic expressions for
+these ground state quantities, which agree well with our numerical results
+within a broad parameter region. Such analytic expressions also agree
+qualitatively with previous numerical results for the 3D spin-orbit coupled
+Fermi gases, where analytic results are lacked. We show that with an increasing
+SOC strength, the chemical potential is shifted by a constant determined by the
+SOC strength. The superfluid pairing gap is enhanced significantly in the BCS
+limit for strong SOC, but only increases slightly in the BEC limit.",1107.2627v3
+2018-07-19,Three-boson spectrum in the presence of 1D spin-orbit coupling: Efimov's generalized radial scaling law,"Spin-orbit coupled cold atom systems, governed by Hamiltonians that contain
+quadratic kinetic energy terms typical for a particle's motion in the usual
+Schr\""odinger equation and linear kinetic energy terms typical for a particle's
+motion in the usual Dirac equation, have attracted a great deal of attention
+recently since they provide an alternative route for realizing fractional
+quantum Hall physics, topological insulators, and spintronics physics. The
+present work focuses on the three-boson system in the presence of 1D spin-orbit
+coupling, which is most relevant to ongoing cold atom experiments. In the
+absence of spin-orbit coupling terms, the three-boson system exibits the Efimov
+effect: the entire energy spectrum is uniquely determined by the $s$-wave
+scattering length and a single three-body parameter, i.e., using one of the
+energy levels as input, the other energy levels can be obtained via Efimov's
+radial scaling law, which is intimately tied to a discrete scaling symmetry. It
+is demonstrated that the discrete scaling symmetry persists in the presence of
+1D spin-orbit coupling, implying the validity of a generalized radial scaling
+law in five-dimensional space. The dependence of the energy levels on the
+scattering length, spin-orbit coupling parameters, and center-of-mass momentum
+is discussed. It is conjectured that three-body systems with other types of
+spin-orbit coupling terms are also governed by generalized radial scaling laws,
+provided the system exhibits the Efimov effect in the absence of spin-orbit
+coupling.",1807.07653v1
+2020-10-05,Terrestrial Orbit-Spin Coupling Torque Episodes in Late 2020,"Orbit-spin coupling torques on the Earth in November 2020 are larger than at
+any other time between 2000 and 2050. This affords an opportunity to observe
+the terrestrial atmospheric response to the putative torque in near real time.",2010.02289v1
+2006-01-30,Electric Dipole Induced Spin Resonance in Quantum Dots,"An alternating electric field, applied to a quantum dot, couples to the
+electron spin via the spin-orbit interaction. We analyze different types of
+spin-orbit coupling known in the literature and find two efficient mechanisms
+of spin control in quantum dots. The linear in momentum Dresselhaus and Rashba
+spin-orbit couplings give rise to a fully transverse effective magnetic field
+in the presence of a Zeeman splitting at lowest order in the spin-orbit
+interaction. The cubic in momentum Dresselhaus terms are efficient in a quantum
+dot with non-harmonic confining potential and give rise to a spin-electric
+coupling proportional to the orbital magnetic field. We derive an effective
+spin Hamiltonian, which can be used to implement spin manipulation on a
+timescale of $10 {\rm ns}$ with the current experimental setups.",0601674v2
+2001-11-22,Theory for high spin systems with orbital degeneracy,"High-spin systems with orbital degeneracy are studied in the large spin
+limit. In the absence of Hund's coupling, the classical spin model is mapped
+onto disconnected orbital systems with spins up and down, respectively. The
+ground state of the isotropic model is an orbital valence bond state where each
+bond is an orbital singlet with parallel spins, and neighbouring bonds interact
+antiferromagnetically. The possible relevance to the transition metal oxides
+are discussed.",0111426v1
+2015-03-23,Spin-Orbit Torques in Two-Dimensional Rashba Ferromagnets,"Magnetization dynamics in single-domain ferromagnets can be triggered by
+charge current if spin-orbit coupling is sufficiently strong. We apply
+functional Keldysh theory to investigate Rashba spin-orbit torques in metallic
+two-dimensional ferromagnets. A reactive, anti-damping-like spin-orbit torque
+as well as a dissipative, field-like torque are calculated microscopically, to
+the leading order in the spin-orbit interaction strength. By calculating the
+first vertex correction we show that the intrinsic anti-damping-like torque
+vanishes unless the scattering rates are spin-dependent.",1503.06872v2
+2024-03-11,Spin-orbit coupling in symmetric and mixed spin-symmetry,"Synthetically spin-orbit coupling in cold atoms couples the pseudo-spin and
+spatial degrees of freedom, and therefore the inherent spin symmetry of the
+system plays an important role. In systems of two pseudo-spin degrees, two
+particles configure symmetric states and anti-symmetric states, but the spin
+symmetry can be mixed for more particles. We study the role of mixed spin
+symmetry in the presence of spin-orbit coupling and consider the system of
+three bosons with two hyper-fine states trapped in a harmonic potential. We
+investigate the ground state and the energy spectrum by implementing exact
+diagonalization. It is found that the interplay between spin-orbit coupling and
+repulsive interactions between anti-aligned pseudo-spins increases the
+population of the unaligned spin components in the ground state. The emergence
+of the mixed spin symmetric states compensates for the rise of the interaction
+energy. With the aligned interaction on, the avoided crossing between the
+ground state and the first excited state is observed only for small
+interaction, and this causes shape changes in the spin populations.
+Furthermore, we find that the pair correlation of the ground state shows
+similarly to that of Tonks-Girardeau gas even for relatively small contact
+interactions and such strong interaction feature is enhanced by the spin-orbit
+coupling.",2403.07188v1
+2012-06-04,Von Neumann Entropy Spectra and Entangled Excitations in Spin-Orbital Models,"We consider the low-energy excitations of one-dimensional spin-orbital models
+which consist of spin waves, orbital waves, and joint spin-orbital excitations.
+Among the latter we identify strongly entangled spin-orbital bound states which
+appear as peaks in the von Neumann entropy (vNE) spectral function introduced
+in this work. The strong entanglement of bound states is manifested by a
+universal logarithmic scaling of the vNE with system size, while the vNE of
+other spin-orbital excitations saturates. We suggest that spin-orbital
+entanglement can be experimentally explored by the measurement of the dynamical
+spin-orbital correlations using resonant inelastic x-ray scattering, where
+strong spin-orbit coupling associated with the core hole plays a role.",1206.1062v1
+2004-07-16,Influences of spin accumulation on the intrinsic spin Hall effect in two dimensional electron gases with Rashba spin-orbit coupling,"In a two dimensional electron gas with Rashba spin-orbit coupling, the
+external electric field may cause a spin Hall current in the direction
+perpendicular to the electric field. This effect was called the intrinsic spin
+Hall effect. In this paper, we investigate the influences of spin accumulation
+on this intrinsic spin Hall effect. We show that due to the existence of
+boundaries in a real sample, the spin Hall current generated by the intrinsic
+spin Hall effect will cause spin accumulation near the edges of the sample, and
+in the presence of spin accumulation, the spin Hall conductivity will not have
+a universal value. The influences of spin accumulation on the intrinsic spin
+Hall effect in narrow strips of two dimensional electron gases with Rashba
+spin-orbit coupling are investigated in detail.",0407419v1
+2020-08-03,Interfacial spin-orbit torques,"Spin-orbit torques offer a promising mechanism for electrically controlling
+magnetization dynamics in nanoscale heterostructures. While spin-orbit torques
+occur predominately at interfaces, the physical mechanisms underlying these
+torques can originate in both the bulk layers and at interfaces. Classifying
+spin-orbit torques based on the region that they originate in provides clues as
+to how to optimize the effect. While most bulk spin-orbit torque contributions
+are well studied, many of the interfacial contributions allowed by symmetry
+have yet to be fully explored theoretically and experimentally. To facilitate
+progress, we review interfacial spin-orbit torques from a semiclassical
+viewpoint and relate these contributions to recent experimental results. Within
+the same model, we show the relationship between different interface transport
+parameters. For charges and spins flowing perpendicular to the interface,
+interfacial spin-orbit coupling both modifies the mixing conductance of
+magnetoelectronic circuit theory and gives rise to spin memory loss. For
+in-plane electric fields, interfacial spin-orbit coupling gives rise to torques
+described by spin-orbit filtering, spin swapping and precession. In addition,
+these same interfacial processes generate spin currents that flow into the
+non-magnetic layer. For in-plane electric fields in trilayer structures, the
+spin currents generated at the interface between one ferromagnetic layer and
+the non-magnetic spacer layer can propagate through the non-magnetic layer to
+produce novel torques on the other ferromagnetic layer.",2008.01182v1
+2019-08-02,Two-dimensional orbital Hall insulators,"The orbital-Hall effect (OHE), similarly to the spin-Hall effect (SHE),
+refers to the creation of a transverse flow of orbital angular momentum that is
+induced by a longitudinally applied electric field. For systems in which the
+spin-orbit coupling (SOC) is sizeable, the orbital and spin angular momentum
+degrees of freedom are coupled, and an interrelationship between charge, spin
+and orbital angular momentum excitations is naturally established. The OHE has
+been explored mostly in metallic systems, where it can be quite strong.
+However, several of its features remain unexplored in two-dimensional (2D)
+materials. Here, we investigate the role of orbital textures for the OHE
+displayed by multi-orbital 2D materials. We predict the appearance of a rather
+large orbital Hall effect in these systems both in their metallic and
+insulating phases. In some cases, the orbital Hall currents are larger than the
+spin Hall ones, and their use as information carriers widens the development
+possibilities of novel spin-orbitronic devices.",1908.00927v2
+2023-05-10,Inverse orbital Hall effect and orbitronic terahertz emission observed in the materials with weak spin-orbit coupling,"The Orbital Hall effect, which originates from materials with weak spin-orbit
+coupling, has attracted considerable interest for spin-orbitronic applications.
+Here, we demonstrate the inverse effect of the orbital Hall effect and observe
+orbitronic terahertz emission in the Ti and Mn materials. Through spin-orbit
+transition in the ferromagnetic layer, the generated orbital current can be
+converted to charge current in the Ti and Mn layers via the inverse orbital
+Hall effect. Furthermore, the inserted W layer provides an additional
+conversion of the orbital-charge current in the Ti and Mn layers, significantly
+enhancing the orbitronic terahertz emission. Moreover, the orbitronic terahertz
+emission can be manipulated by cooperating with the inverse orbital Hall effect
+and the inverse spin Hall effect in the different sample configurations. Our
+results not only discover the physical mechanism of condensed matter physics
+but also pave the way for designing promising spin-orbitronic devices and
+terahertz emitters.",2305.05830v1
+2024-01-11,Orbital Hanle Magnetoresistance in a 3d Transition Metal,"The Hanle magnetoresistance is a telltale signature of spin precession in
+nonmagnetic conductors, in which strong spin-orbit coupling generates edge spin
+accumulation via the spin Hall effect. Here, we report the existence of a large
+Hanle magnetoresistance in single layers of Mn with weak spin-orbit coupling,
+which we attribute to the orbital Hall effect. The simultaneous observation of
+a sizable Hanle magnetoresistance and vanishing small spin Hall
+magnetoresistance in BiYIG/Mn bilayers corroborates the orbital origin of both
+effects. We estimate an orbital Hall angle of 0.016, an orbital relaxation time
+of 2 ps and diffusion length of the order of 2 nm in disordered Mn. Our
+findings indicate that current-induced orbital moments are responsible for
+magnetoresistance effects comparable to or even larger than those determined by
+spin moments, and provide a tool to investigate nonequilibrium orbital
+transport phenomena.",2401.05703v1
+2020-03-01,Spin-orbit interaction and spin selectivity for tunneling electron transfer in DNA,"Electron transfer (ET) in biological molecules such as peptides and proteins
+consists of electrons moving between well defined localized states (donors to
+acceptors) through a tunneling process. Here we present an analytical model for
+ET by tunneling in DNA, in the presence of Spin-Orbit (SO) interaction, to
+produce a strong spin asymmetry with the intrinsic atomic SO strength in meV
+range. We obtain a Hamiltonian consistent with charge transport through $\pi$
+orbitals on the DNA bases and derive the behavior of ET as a function of the
+injection state momentum, the spin-orbit coupling and barrier length and
+strength. A highly consistent scenario arises where two concomitant mechanisms
+for spin selection arises; spin interference and differential spin amplitude
+decay. High spin filtering can take place at the cost of reduced amplitude
+transmission assuming realistic values for the spin-orbit coupling. The spin
+filtering scenario is completed by addressing the spin dependent torque under
+the barrier, with a consistent conserved definition for the spin current.",2003.00582v2
+2013-05-16,Interplay between spin-orbit interactions and a time-dependent electromagnetic field in monolayer graphene,"We apply a circularly and linearly polarized terahertz field on a monolayer
+of graphene taking into account spin-orbit interactions of the intrinsic and
+Rashba type. It turns out that the field can not only be used to induce a gap
+in the energy spectrum, but also to close an existing gap due to the different
+reaction of the spin components on circularly polarized light. Signatures of
+spin-orbit coupling on the density of states of the driven system can be
+observed even for energies where the static density of states is independent of
+spin-orbit interactions. Furthermore it is shown that the time evolution of the
+spin polarization and the orbital dynamics of an initial wave packet can be
+modulated by varying the ratio of the spin-orbit coupling parameters. Assuming
+that the system acquires a quasi stationary state, the optical conductivity of
+the irradiated sample is calculated. Our results confirm the multi step nature
+of the conductivity obtained recently, where the number of intermediate steps
+can be changed by adjusting the spin-orbit coupling parameters and the
+orientation of the field.",1305.3810v2
+2024-03-14,Spin-Orbit Coupled Insulators and Metals on the Verge of Kitaev Spin Liquids in Ilmenite Heterostructures,"Competition and cooperation between electron correlation and relativistic
+spin-orbit coupling give rise to diverse exotic quantum phenomena in solids. An
+illustrative example is spin-orbit entangled quantum liquids, which exhibit
+remarkable features such as topological orders and fractional excitations. The
+Kitaev honeycomb model realizes such interesting states, called the Kitaev spin
+liquids, but its experimental feasibility is still challenging. Here we
+theoretically investigate hexagonal heterostructures including a candidate for
+the Kitaev magnets, MgIrO$_3$, to actively manipulate the electronic and
+magnetic properties toward realizing the Kitaev spin liquids. For three
+different structure types of ilmenite bilayers MgIrO$_3$/$A$TiO$_3$ with $A$ =
+Mn, Fe, Co, and Ni, we obtain the optimized lattice structures, the electronic
+band structures, the stable magnetic orders, and the effective magnetic
+couplings. We find that the spin-orbital coupled bands characterized by the
+pseudospin $j_{\rm eff}=$ 1/2 are retained in the MgIrO$_3$ layer for all the
+heterostructures, but the magnetic state and the band gap depend on the types
+of heterostructures as well as the $A$ atoms. In particular, one type becomes
+metallic irrespective of $A$, while the other two are mostly insulating. We
+show that the insulating cases provide spin-orbit coupled Mott insulating
+states with dominant Kitaev-type interactions, accompanied by different
+combinations of subdominant interactions depending on the heterostructural type
+and $A$, while the metallic cases realize spin-orbit coupled metals with
+various doping rates. Our results indicate that these hexagonal
+heterostructures are a good platform for engineering electronic and magnetic
+properties of the spin-orbital coupled correlated materials, including the
+possibility of Majorana Fermi surfaces and topological superconductivity.",2403.09112v1
+2013-08-15,Spintronics and Pseudospintronics in Graphene and Topological Insulators,"The two-dimensional electron systems in graphene and in topological
+insulators are described by massless Dirac equations. Although the two systems
+have similar Hamiltonians, they are polar opposites in terms of spin-orbit
+coupling strength. We briefly review the status of efforts to achieve long spin
+relaxation times in graphene with its weak spin-orbit coupling, and to achieve
+large current-induced spin polarizations in topological-insulator surface
+states that have strong spin-orbit coupling. We also comment on differences
+between the magnetic responses and dilute-moment coupling properties of the two
+systems, and on the pseudospin analog of giant magnetoresistance in bilayer
+graphene.",1308.3428v1
+2012-06-05,Spin-Orbit Coupling in LaAlO$_3$/SrTiO$_3$ interfaces: Magnetism and Orbital Ordering,"The combination of Rashba spin-orbit coupling and electron correlations can
+induce unusual phenomena in the metallic interface between SrTiO$_3$ and
+LaAlO$_3$. We consider effects of Rashba spin-orbit coupling at this interface
+in the context of the recent observation of anisotropic magnetism. Firstly, we
+show how Rashba spin-orbit coupling in a system near a band-edge can account
+for the observed magnetic anisotropy. Secondly, we investigate the coupling
+between in-plane magnetic-moment anisotropy and nematicity in the form of an
+orbital imbalance between d$_{xz}$ / d$_{yz}$ orbitals. We estimate this
+coupling to be substantial in the low electron density regime. Such an orbital
+ordering can affect magneto transport.",1206.1060v2
+2016-06-24,Low-energy physics of three-orbital impurity model with Kanamori interaction,"We discuss the low-energy physics of the three-orbital Anderson impurity
+model with the Coulomb interaction term of the Kanamori form which has orbital
+SO(3) and spin SU(2) symmetry and describes systems with partially occupied
+$t_{2g}$ shells. We focus on the case with two electrons in the impurity that
+is relevant to Hund's metals. Using the Schrieffer-Wolff transformation we
+derive an effective Kondo model with couplings between the bulk and impurity
+electrons expressed in terms of spin, orbital, and orbital quadrupole
+operators. The bare spin-spin Kondo interaction is much smaller than the
+orbit-orbit and spin-orbital couplings or is even ferromagnetic. Furthermore,
+the perturbative scaling equations indicate faster renormalization of the
+couplings related to orbital degrees of freedom compared to spin degrees of
+freedom. Both mechanisms lead to a slow screening of the local spin moment. The
+model thus behaves similarly to the related quantum impurity problem with a
+larger SU(3) orbital symmetry (Dworin-Narath interaction) where this was first
+observed. We find that the two problems actually describe the same low-energy
+physics since the SU(3) symmetry is dynamically established through the
+renormalization of the splittings of coupling constants to zero. The
+perturbative renormalization group results are corroborated with the
+numerical-renormalization group (NRG) calculations. The dependence of spin
+Kondo temperatures and orbital Kondo temperatures as a function of interaction
+parameters, the hybridization, and the impurity occupancy is calculated and
+discussed.",1606.07654v1
+2016-05-16,Characteristics of persistent spin current components in a quasi-periodic Fibonacci ring with spin-orbit interactions: Prediction of spin-orbit coupling and on-site energy,"In the present work we investigate the behavior of all three components of
+persistent spin current in a quasi-periodic Fibonacci ring subjected to Rashba
+and Dresselhaus spin-orbit interactions. Analogous to persistent charge current
+in a conducting ring where electrons gain a Berry phase in presence of magnetic
+flux, spin Berry phase is associated during the motion of electrons in presence
+of a spin-orbit field which is responsible for the generation of spin current.
+The interplay between two spin-orbit fields along with quasi-periodic Fibonacci
+sequence on persistent spin current is described elaborately, and from our
+analysis, we can estimate the strength of any one of two spin-orbit couplings
+together with on-site energy, provided the other is known.",1605.04716v2
+2013-01-27,Kondo Effect in the Presence of Spin-Orbit Coupling,"Recently, a series of noncentrosymmetric superconductors has been a subject
+of considerable interest since the discovery of superconductivity in CePt_3Si.
+In noncentrosymmetric materials, the degeneracy of bands is lifted in the
+presence of spin-orbit coupling. This will bring about new effects in the Kondo
+effect since the band degeneracy plays an important role in the scattering of
+electrons by localized spins. We investigate the single-impurity Kondo problem
+in the presence of spin-orbit coupling. We examine the effect of spin-orbit
+coupling on the scattering of conduction electrons, by using the Green's
+function method, for the s-d Hamiltonian, with employing a decoupling
+procedure. As a result, we obtain a closed system of equations of Green's
+functions, from which we can calculate physical quantities. The Kondo
+temperature T_K is estimated from a singularity of Green's functions. We show
+that T_K is reduced as the spin-orbit coupling constant \alpha is increased.
+When 2\alpha k_F is comparable to or greater than k_BT_K(\alpha=0), T_K shows
+an abrupt decrease as a result of the band splitting. This suggests a Kondo
+collapse accompanied with a sharp decrease of T_K. The log T-dependence of the
+resistivity will be concealed by the spin-orbit interaction.",1301.6355v1
+2002-06-20,Spin switching in semiconductor quantum dots through spin-orbit coupling,"The spin-orbit coupling influences the total spin of semiconductor quantum
+dots. We analyze the theoretical prediction for the combined effects of
+spin-orbit coupling, weak vertical magnetic fields and deformation of the dot.
+Our results allow the characterization of the quantum dots as spin switches,
+controllable with electric gates.",0206387v2
+2002-08-22,Electronic spin precession in semiconductor quantum dots with spin-orbit coupling,"The electronic spin precession in semiconductor dots is strongly affected by
+the spin-orbit coupling. We present a theory of the electronic spin resonance
+at low magnetic fields that predicts a strong dependence on the dot occupation,
+the magnetic field and the spin-orbit coupling strength. Coulomb interaction
+effects are also taken into account in a numerical approach.",0208425v1
+2005-02-16,Vanishing of the Dissipationless Spin Hall Effect in a Diffusive Two-Dimensional Electron Gas with Spin-Orbit Coupling,"We propose a nonequilibrium Green's function approach to study the spin-Hall
+effect in a two-dimensional electron system with both the Rashba and
+Dresselhaus spin-orbit couplings. By taking into account the long-range
+electron-impurity scattering, the derived kinetic equations are solved
+numerically. It is found the vanishing of the total zero-temperature
+dissipationless spin-Hall effect, contributing from the intrinsic and
+disorder-mediated processes. This result has been examined in the wide ranges
+of spin-orbit coupling constants and electron density.",0502392v1
+2012-03-29,Soliton Magnetization Dynamics in Spin-Orbit Coupled Bose-Einstein Condensates,"Ring-trapped Bose-Einstein condensates subject to spin-orbit coupling support
+localized dark soliton excitations that show periodic density dynamics in real
+space. In addition to the density feature, solitons also carry a localized
+pseudo-spin magnetization that exhibits a rich and tunable dynamics. Analytic
+results for Rashba-type spin-orbit coupling and spin-invariant interactions
+predict a conserved magnitude and precessional motion for the soliton
+magnetization that allows for the simulation of spin-related geometric phases
+recently seen in electronic transport measurements.",1203.6684v1
+2012-03-19,Spin-orbit couplings between distant electrons trapped individually on liquid helium,"We propose an approach to entangle spins of electrons floating on liquid
+helium by coherently manipulating their spin-orbit interactions. The
+configuration consists of single electrons, confined individually on liquid
+helium by the microelectrodes, moving along the surface as the harmonic
+oscillators. It has been known that the spin of an electron could be coupled to
+its orbit (i.e., the vibrational motion) by properly applying a magnetic field.
+Based on this single electron spin-orbit coupling, here we show that a
+Jaynes-Cummings (JC) type interaction between the spin of an electron and the
+orbit of another electron at a distance could be realized via the strong
+Coulomb interaction between the electrons. Consequently, the proposed JC
+interaction could be utilized to realize a strong orbit-mediated spin-spin
+coupling and implement the desirable quantum information processing between the
+distant electrons trapped individually on liquid helium.",1203.4079v2
+2012-01-08,Spin-orbit coupled Fermi liquid theory of ultra-cold magnetic dipolar fermions,"We investigate Fermi liquid states of the ultra-cold magnetic dipolar Fermi
+gases in the simplest two-component case including both thermodynamic
+instabilities and collective excitations. The magnetic dipolar interaction is
+invariant under the simultaneous spin-orbit rotation, but not under either the
+spin or the orbit one. Therefore, the corresponding Fermi liquid theory is
+intrinsically spin-orbit coupled. This is a fundamental feature of magnetic
+dipolar Fermi gases different from electric dipolar ones. The Landau
+interaction matrix is calculated and is diagonalized in terms of the spin-orbit
+coupled partial-wave channels of the total angular momentum J. The leading
+thermodynamic instabilities lie in the channels of ferromagnetism hybridized
+with the ferronematic order with J = 1+ and the spin-current mode with J = 1-,
+where + and - represent even and odd parities, respectively. An exotic
+propagating collective mode is identified as spin-orbit coupled Fermi surface
+oscillations in which spin distribution on the Fermi surface exhibits a
+topologically nontrivial hedgehog configuration.",1201.1607v3
+2023-11-27,Gilbert damping in two-dimensional metallic anti-ferromagnets,"A finite spin life-time of conduction electrons may dominate Gilbert damping
+of two-dimensional metallic anti-ferromagnets or anti-ferromagnet/metal
+heterostructures. We investigate the Gilbert damping tensor for a typical
+low-energy model of a metallic anti-ferromagnet system with honeycomb magnetic
+lattice and Rashba spin-orbit coupling for conduction electrons. We distinguish
+three regimes of spin relaxation: exchange-dominated relaxation for weak
+spin-orbit coupling strength, Elliot-Yafet relaxation for moderate spin-orbit
+coupling, and Dyakonov-Perel relaxation for strong spin-orbit coupling. We
+show, however, that the latter regime takes place only for the in-plane Gilbert
+damping component. We also show that anisotropy of Gilbert damping persists for
+any finite spin-orbit interaction strength provided we consider no spatial
+variation of the N\'eel vector. Isotropic Gilbert damping is restored only if
+the electron spin-orbit length is larger than the magnon wavelength. Our theory
+applies to MnPS3 monolayer on Pt or to similar systems.",2311.16268v2
+2018-09-28,Spin-orbit crossed susceptibility in topological Dirac semimetals,"We theoretically study the spin-orbit crossed susceptibility of topological
+Dirac semimetals. Because of strong spin-orbit coupling, the orbital motion of
+electrons is modulated by Zeeman coupling, which contributes to orbital
+magnetization. We find that the spin-orbit crossed susceptibility is
+proportional to the separation of the Dirac points and it is highly
+anisotropic. The orbital magnetization is induced only along the rotational
+symmetry axis. We also study the conventional spin susceptibility. The spin
+susceptibility exhibits anisotropy and the spin magnetization is induced only
+along the perpendicular to the rotational symmetry axis in contrast to the
+spin-orbit crossed susceptibility. We quantitatively compare the two
+susceptibilities and find that they can be comparable.",1809.10852v2
+2019-03-29,Spin-Orbital Hallmarks of Unconventional Superconductors Without Inversion Symmetry,"The spin-orbital polarization of superconducting excitations in momentum
+space is shown to provide distinctive marks of unconventional pairing in the
+presence of inversion symmetry breaking.Taking the prototypical example of an
+electronic system with atomic spin-orbit and orbital-Rashba couplings, we
+provide a general description of the spin-orbital textures and their most
+striking changeover moving from the normal to the superconducting state. We
+find that the variation of the spin-texture is strongly imprinted by the
+combination of the misalignment of spin-triplet d-vector with the inversion
+asymmetry g-vector coupling and the occurrence of superconducting nodal
+excitations. Remarkably, the multi-orbital character of the superconducting
+state allows to unveil a unique type of topological transition for the
+spin-winding around the nodal points. This finding indicates the fundamental
+topological relation between chiral and spin-winding in nodal superconductors.
+By analogy between spin- and orbital-triplet pairing we point out how orbital
+polarization patterns can be also employed to assess the character of the
+superconducting state.",1903.12379v2
+2024-03-21,Spin-orbit interaction with large spin in the semi-classical regime,"We consider the time dependent Schr\""odinger equation with a coupling
+spin-orbit in the semi-classical regime $\hbar\searrow 0$ and large spin number
+$\spin\rightarrow +\infty$ such that $\hbar^\delta\spin=c$ where $c>0$ and
+$\delta>0$ are constant. The initial state $\Psi(0)$ is a product of an orbital
+coherent state in $L^2(\R^d)$ and a spin coherent state in a spin irreducible
+representation space ${\mathcal H}_{2\spin +1}$. For $\delta <1$, at the
+leading order in $\hbar$, the time evolution $\Psi(t)$ of $ \Psi(0)$ is well
+approximated by the product of an orbital and a spin coherent state.
+Nevertheless for $1/2<\delta<1$ the quantum orbital leaves the classical
+orbital. For $\delta=1$ we prove that this last claim is no more true when the
+interaction depends on the orbital variables.
+  For the Dicke model, we prove that the orbital partial trace of the projector
+on $\Psi(t)$ is a mixed state in $L^2(\R)$ for small $t>0$.",2403.14408v1
+2011-12-19,Counterflow of spontaneous mass currents in trapped spin-orbit coupled Fermi gases,"We use the Bogoliubov-de Gennes formalism and study the ground-state phases
+of trapped spin-orbit coupled Fermi gases in two dimensions. Our main finding
+is that the presence of a symmetric (Rashba type) spin-orbit coupling
+spontaneously induces counterflowing mass currents in the vicinity of the trap
+edge, i.e. $\uparrow$ and $\downarrow$ particles circulate in opposite
+directions with equal speed. These currents flow even in noninteracting
+systems, but their strength decreases toward the molecular BEC limit, which can
+be achieved either by increasing the spin-orbit coupling or the interaction
+strength. These currents are also quite robust against the effects of
+asymmetric spin-orbit couplings in $x$ and $y$ directions, gradually reducing
+to zero as the spin-orbit coupling becomes one dimensional. We compare our
+results with those of chiral p-wave superfluids/superconductors.",1112.4468v2
+2012-03-13,Impact of Dresselhaus vs. Rashba spin-orbit coupling on the Holstein polaron,"We utilize an exact variational numerical procedure to calculate the ground
+state properties of a polaron in the presence of Rashba and linear Dresselhaus
+spin-orbit coupling. We find that when the linear Dresselhaus spin-orbit
+coupling approaches the Rashba spin-orbit coupling, the Van-Hove singularity in
+the density of states will be shifted away from the bottom of the band and
+finally disappear when the two spin-orbit couplings are tuned to be equal. The
+effective mass will be suppressed; the trend will become more significant for
+low phonon frequency. The presence of two dominant spin-orbit couplings will
+make it possible to tune the effective mass with more varied observables.",1203.2795v1
+2012-11-09,Metal-insulator transition in three-band Hubbard model with strong spin-orbit interaction,"Recent investigations suggest that both spin-orbit coupling and electron
+correlation play very crucial roles in the $5d$ transition metal oxides. By
+using the generalized Gutzwiller variational method and dynamical mean-field
+theory with the hybridization expansion continuous time quantum Monte Carlo as
+impurity solver, the three-band Hubbard model with full Hund's rule coupling
+and spin-orbit interaction terms, which contains the essential physics of
+partially filled $t_{2g}$ sub-shell of $5d$ materials, is studied
+systematically. The calculated phase diagram of this model exhibits three
+distinct phase regions, including metal, band insulator and Mott insulator
+respectively. We find that the spin-orbit coupling term intends to greatly
+enhance the tendency of the Mott insulator phase. Furthermore, the influence of
+the electron-electron interaction on the effective strength of spin-orbit
+coupling in the metallic phase is studied in detail. We conclude that the
+electron correlation effect on the effective spin-orbit coupling is far beyond
+the mean-field treatment even in the intermediate coupling region.",1211.2055v1
+2013-07-05,Spin-orbit coupled fermions in ladder-like optical lattices at half-filling,"We study the ground-state phase diagram of two-component fermions loaded in a
+ladder-like lattice at half filling in the presence of spin-orbit coupling. For
+repulsive fermions with unidirectional spin-orbit coupling along the legs we
+identify a N\'{e}el state which is separated from rung-singlet and
+ferromagnetic states by Ising phase transition lines. These lines cross for
+maximal spin-orbit coupling and a direct Gaussian phase transition between
+rung-singlet and ferro phases is realized. For the case of Rashba-like
+spin-orbit coupling, besides the rung singlet phases two distinct striped
+ferromagnetic phases are formed. In case of attractive fermions with spin-orbit
+coupling at half-filling for decoupled chains we identify a dimerized state
+that separates a singlet superconductor and a ferromagnetic states.",1307.1607v1
+2015-04-19,Hydrodynamics of Normal Atomic Gases with Spin-orbit Coupling,"Successful realization of spin-orbit coupling in atomic gases by the NIST
+scheme opens the prospect of studying the effects of spin-orbit coupling on
+many-body physics in an unprecedentedly controllable way. Here we derive the
+linearized hydrodynamic equations for the normal atomic gases of the spin-orbit
+coupling by the NIST scheme with zero detuning. We show that the hydrodynamics
+of the system crucially depends on the momentum susceptibilities which can be
+modified by the spin-orbit coupling. We reveal the effects of the spin-orbit
+coupling on the sound velocities and the dipole mode frequency of the gases by
+applying our formalism to the ideal Fermi gas. We also discuss the
+generalization of our results to other situations.",1504.04786v2
+2017-10-29,Contact theory for spin-orbit-coupled Fermi gases,"We develop the contact theory for spin-orbit-coupled Fermi gases. By using a
+perturbation method, we derive analytically the universal two-body behavior at
+short distance, which does not depend on the short-range details of interatomic
+potentials. We find that two new scattering parameters need to be introduced
+because of spin-orbit coupling, besides the traditional $s$- and $p$-wave
+scattering length (volume) and effective ranges. This is a general and unique
+feature for spin-orbit-coupled systems. Consequently, two new adiabatic energy
+relations with respect to the new scattering parameters are obtained, in which
+a new contact is involved because of spin-orbit coupling. In addition, we
+derive the asymptotic behavior of the large-momentum distribution, and find
+that the subleading tail is corrected by the new contact. This work paves the
+way for exploring the profound properties of spin-orbit-coupled many-body
+systems, according to two-body solutions.",1710.10579v2
+2018-10-16,Induced spin-orbit coupling in silicon thin films by bismuth doping,"We demonstrate an enhancement of the spin-orbit coupling in silicon (Si) thin
+films by doping with bismuth (Bi), a heavy metal, using ion implantation.
+Quantum corrections to conductance at low temperature in phosphorous-doped Si
+before and after Bi implantation is measured to probe the increase of the
+spin-orbit coupling, and a clear modification of magnetoconductance signals is
+observed: Bi doping changes magnetoconductance from weak localization to the
+crossover between weak localization and weak antilocalization. The elastic
+diffusion length, phase coherence length and spin-orbit coupling length in Si
+with and without Bi implantation are estimated, and the spin-orbit coupling
+length after the Bi doping becomes the same order of magnitude (Lso = 54 nm)
+with the phase coherence length (L{\phi} = 35 nm) at 2 K. This is an
+experimental proof that the spin-orbit coupling strength in Si thin film is
+tunable by doping with heavy metals.",1810.06878v1
+2011-01-06,Quantum phase transitions in a strongly entangled spin-orbital chain: A field-theoretical approach,"Motivated by recent experiments on quasi-1D vanadium oxides, we study quantum
+phase transitions in a one-dimensional spin-orbital model describing a Haldane
+chain and a classical Ising chain locally coupled by the relativistic
+spin-orbit interaction. By employing a field-theoretical approach, we analyze
+the topology of the ground-state phase diagram and identify the nature of the
+phase transitions. In the strong coupling limit, a long-range N\'eel order of
+entangled spin and orbital angular momentum appears in the ground state. We
+find that, depending on the relative scales of the spin and orbital gaps, the
+linear chain follows two distinct routes to reach the N\'eel state. First, when
+the orbital exchange is the dominating energy scale, a two-stage ordering takes
+place in which the magnetic transition is followed by melting of the orbital
+Ising order; both transitions belong to the two-dimensional Ising universality
+class. In the opposite limit, the low-energy orbital modes undergo a continuous
+reordering transition which represents a line of Gaussian critical points. On
+this line the orbital degrees of freedom form a Tomonaga-Luttinger liquid. We
+argue that the emergence of the Gaussian criticality results from merging of
+the two Ising transitions in the strong hybridization region where the
+characteristic spin and orbital energy scales become comparable. Finally, we
+show that, due to the spin-orbit coupling, an external magnetic field acting on
+the spins can induce an orbital Ising transition.",1101.1268v3
+2015-03-23,Critical Temperature and Tunneling Spectroscopy of Superconductor-Ferromagnet Hybrids with Intrinsic Rashba-Dresselhaus Spin-Orbit Coupling,"We investigate theoretically how the proximity effect in
+superconductor/ferromagnet hybrid structures with intrinsic spin-orbit coupling
+manifests in the density of states and critical temperature. To describe a
+general scenario, we allow for both Rashba and Dresselhaus type spin-orbit
+coupling. Our results are obtained via the quasiclassical theory of
+superconductivity, extended to include spin-orbit coupling in the Usadel
+equation and Kupriyanov--Lukichev boundary conditions. Unlike previous works,
+we have derived a Riccati parametrization of the Usadel equation with
+spin-orbit coupling which allows us to address the full proximity regime.
+First, we consider the density of states in both SF bilayers and SFS trilayers,
+where the spectroscopic features in the latter case are sensitive to the phase
+difference between the two superconductors. We find that the presence of
+spin-orbit coupling leaves clear spectroscopic fingerprints in the density of
+states due to its role in creating spin-triplet Cooper pairs. Unlike SF and SFS
+structures without spin-orbit coupling, the density of states in the present
+case depends strongly on the direction of magnetization. We show that the
+spin-orbit coupling can stabilize singlet superconductivity even in the
+presence of a strong exchange field $h \gg \Delta$. This leads to the
+possibility of a magnetically tunable minigap: changing the direction of the
+exchange field opens and closes the minigap. We also determine how the critical
+temperature $T_c$ of an SF bilayer is affected by spin-orbit coupling and
+demonstrate that one can achieve a spin-valve effect with a single ferromagnet.
+We find that $T_c$ displays highly non-monotonic behavior both as a function of
+the magnetization direction and the type and direction of the spin-orbit
+coupling, offering a new way to exert control over the superconductivity of
+proximity structures.",1503.06835v2
+2019-03-17,Sensing Kondo correlations in a suspended carbon nanotube mechanical resonator with spin-orbit coupling,"We study electron mechanical coupling in a suspended carbon nanotube (CNT)
+quantum dot device. Electron spin couples to the flexural vibration mode due to
+spin-orbit coupling in the electron tunneling processes. In the weak coupling
+limit, i.e. electron-vibration coupling is much smaller than the electron
+energy scale, the damping and resonant frequency shift of the CNT resonator can
+be obtained by calculating the dynamical spin susceptibility. We find that
+strong spin-flip scattering processes in Kondo regime significantly affect the
+mechanical motion of the carbon nanotube: Kondo effect induces strong damping
+and frequency shift of the CNT resonator.",1903.07049v1
+2017-11-19,SU($N$) spin-wave theory: Application to spin-orbital Mott insulators,"We present the application of the SU($N$) ($N>2$) spin-wave theory to
+spin-orbital Mott insulators whose ground states exhibit magnetic orders. When
+taking both the spin and orbital degrees of freedom into account rather than
+projecting onto the Kramers doublet, the lowest spin-orbital locking energy
+levels, due to the inevitable spin-orbital multipole exchange interactions, the
+SU($N$) spin-wave theory should take the place of the SU($2$) one. To implement
+the application, we introduce an efficient general local mean field approach
+which involves all the local fluctuations into the SU($N$) linear spin-wave
+theory. Our approach is tested firstly by calculating the multipolar spin-wave
+spectra of the SU($4$) antiferromagnetic model. Then we apply it to
+spin-orbital Mott insulators. It is revealed that the Hund's coupling would
+influence the effectiveness of the isospin-$1/2$ representation when the spin
+orbital coupling is not large enough. Besides, we also calculate the spin-wave
+spectra based on the first principle calculations for two concrete materials,
+$\alpha$-RuCl$_3$ and Sr$_2$IrO$_4$. The SU($N$) spin-wave theory appropriately
+depicts the low-energy magnons and the spin-orbital excitations qualitatively.",1711.07041v1
+2020-06-24,Landau levels in spin-orbit coupling proximitized graphene: bulk states,"We study the magnetic-field dependence of Landau levels in graphene
+proximitized by large spin-orbit coupling materials, such as transition-metal
+dichalcogenides or topological insulators. In addition to the Rashba coupling,
+two types of intrinsic spin-orbit interactions, uniform (Kane-Mele type) and
+staggered (valley Zeeman type), are included, to resolve their interplay with
+magnetic orbital effects. Employing a continuum model approach, we derive
+analytic expressions for low-energy Landau levels, which can be used to extract
+local orbital and spin-orbit coupling parameters from scanning probe
+spectroscopy experiments. We compare different parameter regimes to identify
+fingerprints of relative and absolute magnitudes of intrinsic spin-orbit
+coupling in the spectra. The inverted band structure of graphene proximitized
+by WSe$_2$ leads to an interesting crossing of Landau states across the bulk
+gap at a crossover field, providing insights into the size of Rashba spin-orbit
+coupling. Landau level spectroscopy can help to resolve the type and signs of
+the intrinsic spin-orbit coupling by analyzing the symmetry in energy and
+number of crossings in the Landau fan chart. Finally, our results suggest that
+the strong response to the magnetic field of Dirac electrons in proximitized
+graphene can be associated with extremely large self-rotating magnetic moments.",2006.13651v1
+2023-03-21,Intrinsic Magnon Orbital Hall Effect in Honeycomb Antiferromagnets,"We theoretically investigate the transport of magnon orbitals in a honeycomb
+antiferromagnet. We find that the magnon orbital Berry curvature is finite even
+without spin-orbit coupling and thus the resultant magnon orbital Hall effect
+is an intrinsic property of the honeycomb antiferromagnet rooted only in the
+exchange interaction and the lattice structure. Due to the intrinsic nature of
+the magnon orbital Hall effect, the magnon orbital Nernst conductivity is
+estimated to be orders of magnitude larger than the predicted values of the
+magnon spin Nernst conductivity that requires finite spin-orbit coupling. For
+the experimental detection of the predicted magnon orbital Hall effect, we
+invoke the magnetoelectric effect that couples the magnon orbital and the
+electric polarization, which allows us to detect the magnon orbital
+accumulation through the local voltage measurement. Our results pave a way for
+a deeper understanding of the topological transport of the magnon orbitals and
+also its utilization for low-power magnon-based orbitronics, namely magnon
+orbitronics.",2303.11687v1
+2010-03-13,Motion and gravitational wave forms of eccentric compact binaries with orbital-angular-momentum-aligned spins under next-to-leading order in spin-orbit and leading order in spin(1)-spin(2) and spin-squared couplings,"A quasi-Keplerian parameterisation for the solutions of second post-Newtonian
+(PN) accurate equations of motion for spinning compact binaries is obtained
+including leading order spin-spin and next-to-leading order spin-orbit
+interactions. Rotational deformation of the compact objects is incorporated.
+For arbitrary mass ratios the spin orientations are taken to be parallel or
+anti-parallel to the orbital angular momentum vector. The emitted gravitational
+wave forms are given in analytic form up to 2PN point particle, 1.5PN spin
+orbit and 1PN spin-spin contributions, where the spins are counted of 0PN
+order.",1003.2735v4
+2010-04-18,Spin Orbit Coupling and Spin Waves in Ultrathin Ferromagnets: The Spin Wave Rashba Effect,"We present theoretical studies of the influence of spin orbit coupling on the
+spin wave excitations of the Fe monolayer and bilayer on the W(110) surface.
+The Dzyaloshinskii-Moriya interaction is active in such films, by virtue of the
+absence of reflection symmetry in the plane of the film. When the magnetization
+is in plane, this leads to a linear term in the spin wave dispersion relation
+for propagation across the magnetization. The dispersion relation thus assumes
+a form similar to that of an energy band of an electron trapped on a
+semiconductor surfaces with Rashba coupling active. We also show SPEELS
+response functions that illustrate the role of spin orbit coupling in such
+measurements. In addition to the modifications of the dispersion relations for
+spin waves, the presence of spin orbit coupling in the W substrate leads to a
+substantial increase in the linewidth of the spin wave modes. The formalism we
+have developed applies to a wide range of systems, and the particular system
+explored in the numerical calculations provides us with an illustration of
+phenomena which will be present in other ultrathin ferromagnet/substrate
+combinations.",1004.3066v1
+2019-06-27,Extrinsic Spin-Orbit Coupling and Spin Relaxation in Phosphorene,"An effective Hamiltonian is derived to describe the conduction band of
+monolayer black phosphorus (phosphorene) in the presence of spin-orbit coupling
+and external electric field. Envelope function approximation along with
+symmetry arguments and Lowdin partitioning are utilized to derive extrinsic
+spin-orbit coupling. The resulting spin splitting appears in fourth order
+perturbation terms and is shown to be linear in both the magnitude of the
+external electric field and the strength of the atomic spin-orbit coupling,
+similar to the Bychkov-Rashba expression but with an in-plane anisotropy. The
+anisotropy depends on the coupling between conduction band and other bands both
+close and distant in energy. The spin relaxation of conduction electrons is
+then calculated within the Dyakonov-Perel mechanism where momentum scattering
+randomizes the polarization of a spin ensemble. We show how the anisotropic
+Fermi contour and the anisotropic extrinsic spin splitting contribute to the
+anisotropy of spin-relaxation time. Scattering centers in the substrate are
+considered to be charged impurities with screened Coulomb potential.",1906.11939v2
+2017-07-31,Spin-orbit torques from interfacial spin-orbit coupling for various interfaces,"We use a perturbative approach to study the effects of interfacial spin-orbit
+coupling in magnetic multilayers by treating the two-dimensional Rashba model
+in a fully three-dimensional description of electron transport near an
+interface. This formalism provides a compact analytic expression for
+current-induced spin-orbit torques in terms of unperturbed scattering
+coefficients, allowing computation of spin-orbit torques for various contexts,
+by simply substituting scattering coefficients into the formulas. It applies to
+calculations of spin-orbit torques for magnetic bilayers with bulk magnetism,
+those with interface magnetism, a normal metal/ferromagnetic insulator
+junction, and a topological insulator/ferromagnet junction. It predicts a
+dampinglike component of spin-orbit torque that is distinct from any intrinsic
+contribution or those that arise from particular spin relaxation mechanisms. We
+discuss the effects of proximity-induced magnetism and insertion of an
+additional layer and provide formulas for in-plane current, which is induced by
+a perpendicular bias, anisotropic magnetoresistance, and spin memory loss in
+the same formalism.",1707.09847v1
+2015-12-20,Magnetic and nematic phases in a Weyl type spin-orbit-coupled spin-1 Bose gas,"We present a variational study of the spin-1 Bose gases in a harmonic trap
+with three-dimensional spin-orbit coupling of Weyl type. For weak spin-orbit
+coupling, we treat the single-particle ground states as the form of
+perturbational harmonic oscillator states in the lowest total angular momentum
+manifold with $j=1, m_j=1,0,-1$. When the two-body interaction is considered,
+we set the trail order parameter as the superposition of three degenerate
+single-particle ground-states and the weight coefficients are determined by
+minimizing the energy functional. Two ground state phases, namely the magnetic
+and the nematic phases, are identified depending on the spin-independent and
+the spin-dependent interactions. Unlike the non-spin-orbit-coupled spin-1
+Bose-Einstein condensate for which the phase boundary between the magnetic and
+the nematic phase lies exactly at zero spin-dependent interaction, the boundary
+is modified by the spin-orbit-coupling. We find the magnetic phase is featured
+with phase-separated density distributions, 3D skyrmion-like spin textures and
+competing magnetic and biaxial nematic orders, while the nematic phase is
+featured with miscible density distributions, zero magnetization and spatially
+modulated uniaxial nematic order. The emergence of higher spin order creates
+new opportunities for exploring spin-tensor-related physics in spin-orbit
+coupled superfluid.",1512.06394v1
+2002-11-29,Spin-Orbit induced semiconductor spin guides,"The tunability of the Rashba spin-orbit coupling allows to build
+semiconductor heterostructures with space modulated coupling intensities. We
+show that a wire-shaped spin-orbit modulation in a quantum well can support
+propagating electronic states inside the wire only for a certain spin
+orientation and, therefore, it acts as an effective spin transmission guide for
+this particular spin orientation.",0211694v1
+2003-07-27,Universal Intrinsic Spin-Hall Effect,"We describe a new effect in semiconductor spintronics that leads to
+dissipationless spin-currents in paramagnetic spin-orbit coupled systems. We
+argue that in a high mobility two-dimensional electron system with substantial
+Rashba spin-orbit coupling, a spin-current that flows perpendicular to the
+charge current is intrinsic. In the usual case where both spin-orbit split
+bands are occupied, the spin-Hall conductivity has a universal value.",0307663v2
+2004-12-22,Spin-orbit induced interference in polygon-structures,"We investigate the spin-orbit induced spin-interference pattern of ballistic
+electrons travelling along any regular polygon. It is found that the
+spin-interference depends strongly on the Rashba and Dresselhaus spin-orbit
+constants as well as on the sidelength and alignment of the polygon. We derive
+the analytical formulae for the limiting cases of either zero Dresselhaus or
+zero Rashba spin-orbit coupling, including the result obtained for a circle. We
+calculate the nonzero Dresselhaus and Rashba case numerically for the square,
+triangle, hexagon, and circle and discuss the observability of the
+spin-interference which can potentially be used to measure the Rashba and
+Dresselhaus coefficients.",0412609v1
+2018-08-24,"Residual spin susceptibility in the spin-triplet, orbital-singlet model","Nuclear magnetic resonance (NMR) and Knight shift measurements are critical
+tools in the identification of spin-triplet superconductors. We discuss the
+effects of spin orbit coupling on the Knight shift and susceptibilities for a
+variety of spin triplet multi-orbital gap functions with orbital-singlet
+character and compare their responses to ""traditional"" single band spin-triplet
+($p_x+ip_y$) superconductors. We observe a non-negligible residual
+spin-susceptibility at low temperature.",1808.08029v1
+2006-03-14,Spin entanglement induced by spin-orbit interactions in coupled quantum dots,"We theoretically explore the possibility of creating spin quantum
+entanglement in a system of two electrons confined respectively in two
+vertically coupled quantum dots in the presence of Rashba type spin-orbit
+coupling. We find that the system can be described by a generalized Jaynes -
+Cummings model of two modes bosons interacting with two spins. The lower
+excitation states of this model are calculated to reveal the underlying physics
+of the far infrared absorption spectra. The analytic perturbation approach
+shows that an effective transverse coupling of spins can be obtained by
+eliminating the orbital degrees of freedom in the large detuning limit. Here,
+the orbital degrees of freedom of the two electrons, which are described by two
+modes of bosons, serve as a quantized data bus to exchange the quantum
+information between two electrons. Then a nontrivial two-qubit logic gate is
+realized and spin entanglement between the two electrons is created by virtue
+of spin-orbit coupling.",0603363v2
+2006-04-27,Orbital and spin relaxation in single and coupled quantum dots,"Phonon-induced orbital and spin relaxation rates of single electron states in
+lateral single and double quantum dots are obtained numerically for realistic
+materials parameters. The rates are calculated as a function of magnetic field
+and interdot coupling, at various field and quantum dot orientations. It is
+found that orbital relaxation is due to deformation potential phonons at low
+magnetic fields, while piezoelectric phonons dominate the relaxation at high
+fields. Spin relaxation, which is dominated by piezoelectric phonons, in single
+quantum dots is highly anisotropic due to the interplay of the Bychkov-Rashba
+and Dresselhaus spin-orbit couplings. Orbital relaxation in double dots varies
+strongly with the interdot coupling due to the cyclotron effects on the
+tunneling energy. Spin relaxation in double dots has an additional anisotropy
+due to anisotropic spin hot spots which otherwise cause giant enhancement of
+the rate at useful magnetic fields and interdot couplings. Conditions for the
+absence of the spin hot spots in in-plane magnetic fields (easy passages) and
+perpendicular magnetic fields (weak passages) are formulated analytically for
+different growth directions of the underlying heterostructure. It is shown that
+easy passages disappear (spin hot spots reappear) if the double dot system
+loses symmetry by an xy-like perturbation.",0604633v1
+2017-12-21,Cooper Pairing in A Doped 2D Antiferromagnet with Spin-Orbit Coupling,"We study the two-dimensional Hubbard model with the Rashba type spin-orbit
+coupling within and beyond the mean-field theory. The antiferromagnetic ground
+state for the model at half-filling and the Cooper pairing induced by
+antiferromagnetic spin fluctuations near half-filling are examined based on the
+random-phase approximation. We show that the antiferromagnetic order is
+suppressed and the magnetic susceptibility turns out to be anisotropic in the
+presence of the spin-orbit coupling. Energy spectrums of transverse spin
+fluctuations are obtained and the effective interactions between holes mediated
+by antiferromagnetic spin fluctuations are deduced in the case of low hole
+doping. It seems that the spin-orbit coupling tends to form s+p-wave Cooper
+pairs, while the s+d-wave pairing is dominant when the spin-orbit coupling is
+absent.",1712.07908v1
+2011-05-21,Quantum states and linear response in dc and electromagnetic fields for charge current and spin polarization of electrons at Bi/Si interface with giant spin-orbit coupling,"An expansion of the nearly free-electron model constructed by Frantzeskakis,
+Pons and Grioni [Phys. Rev. B {\bf 82}, 085440 (2010)] describing quantum
+states at Bi/Si(111) interface with giant spin-orbit coupling is developed and
+applied for the band structure and spin polarization calculation, as well as
+for the linear response analysis for charge current and induced spin caused by
+dc field and by electromagnetic radiation. It is found that the large
+spin-orbit coupling in this system may allow resolving the spin-dependent
+properties even at room temperature and at realistic collision rate. The
+geometry of the atomic lattice combined with spin-orbit coupling leads to an
+anisotropic response both for current and spin components related to the
+orientation of the external field. The in-plane dc electric field produces only
+the in-plane components of spin in the sample while both the in-plane and
+out-of-plane spin components can be excited by normally propagating
+electromagnetic wave with different polarizations.",1105.4215v1
+2021-06-21,Spin structure factors of doped monolayer Germanene in the presence of spin-orbit coupling,"In this paper, we present a Kane-Mele model in the presence of magnetic field
+and next nearest neighbors hopping amplitudes for investigations of the spin
+susceptibilities of Germanene layer. Green's function approach has been
+implemented to find the behavior of dynamical spin susceptibilities of
+Germanene layer within linear response theoryand in the presence of magnetic
+field and spin-orbit coupling at finite temperature. Our results show the
+magnetic excitation mode for both longitudinal and transverse components of
+spin tends to higher frequencies with spin-orbit coupling strength. Moreover
+the frequency positions of sharp peaks in longitudinal dynamical spin
+susceptibility are not affected by variation of magnetic field while the peaks
+in transverse dynamical susceptibility moves to lower frequencies with magnetic
+field. The effects of electron doping on frequency behaviors of spin
+susceptibilities have been addressed in details. Finally the temperature
+dependence of static spin structure factors due to the effects of spin-orbit
+coupling, magnetic field and chemical potential has been studied.",2106.11377v1
+2015-11-28,Spin-orbit torque engineering via oxygen manipulation,"Spin transfer torques allow the electrical manipulation of the magnetization
+at room temperature, which is desirable in spintronic devices such as spin
+transfer torque memories. When combined with spin-orbit coupling, they give
+rise to spin-orbit torques which are a more powerful tool for magnetization
+control and can enrich device functionalities. The engineering of spin-orbit
+torques, based mostly on the spin Hall effect, is being intensely pursued. Here
+we report that the oxidation of spin-orbit torque devices triggers a new
+mechanism of spin-orbit torque, which is about two times stronger than that
+based on the spin Hall effect. We thus introduce a way to engineer spin-orbit
+torques via oxygen manipulation. Combined with electrical gating of the oxygen
+level, our findings may also pave the way towards reconfigurable logic devices.",1511.08868v1
+2002-11-29,The orbital moment in CoO,"The orbital and spin moment of the Co2+ ion in CoO has been calculated within
+the quasi-atomic approach with taking into account the intra-atomic spin-orbit
+coupling. The orbital moment of 1.38 \mu_{B} amounts at 0 K, in the
+magnetically-ordered state, to more than 34% of the total moment (4.02 \mu_{B})
+and yields the L/S ratio of 1.04, close to the experimental value.
+  PACS No: 71.70.E; 75.10.D Keywords: 3d magnetism, crystal field, spin-orbit
+coupling, orbital moment, CoO",0211705v1
+2011-06-24,Spin-orbit coupling induced Mott transition in Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0<x<0.2),"We propose a new mechanism for the paramagnetic metal-insulator transition in
+the layered perovskite Ca$_{2-x}$Sr$_{x}$RuO$_{4}$ (0<x<0.2). The LDA+U
+approach including spin-orbit coupling is used to calculate the electronic
+structures. In Ca$_{2}$RuO$_{4}$, we show that the spin-orbit effect is
+strongly enhanced by the Coulomb repulsion, which leads to an insulating phase.
+When Ca is substituted by Sr, the effective spin-orbit splitting is reduced due
+to the increasing bandwidth of the degenerate $d_{xz}$ and $d_{yz}$ orbitals.
+For x=0.2, the compound is found to be metallic. We show that these results are
+in good agreement with the experimental phase diagram.",1106.5046v1
+2024-01-30,A novel non-adiabatic spin relaxation mechanism in molecular qubits,"The interaction of electronic spin and molecular vibrations mediated by
+spin-orbit coupling governs spin relaxation in molecular qubits. I derive an
+extended molecular spin Hamiltonian that includes both adiabatic and
+non-adiabatic spin-dependent interactions, and I implement the computation of
+its matrix elements using state-of-the-art density functional theory. The new
+molecular spin Hamiltonian contains a novel spin-vibrational orbit interaction
+with non-adiabatic origin together with the traditional molecular Zeeman and
+zero-field splitting interactions with adiabatic origin. The spin-vibrational
+orbit interaction represents a non-Abelian Berry curvature on the ground-state
+electronic manifold and corresponds to an effective magnetic field in the
+electronic spin dynamics. I further develop a spin relaxation rate model that
+estimates the spin relaxation time via the two-phonon Raman process. An
+application of the extended molecular spin Hamiltonian together with the spin
+relaxation rate model to Cu(II) porphyrin, a prototypical $S=1/2$ molecular
+qubit, demonstrates that the spin relaxation time at elevated temperatures is
+dominated by the non-adiabatic spin-vibrational orbit interaction. The computed
+spin relaxation rate and its magnetic field orientation dependence are in
+excellent agreement with experimental measurements.",2401.16738v1
+2001-10-25,Re-examination of orbital ordering in LaMnO$_3$: Electron-electron and electron-lattice interactions,"The interactions between $e_g$ orbitals in neighboring sites are investigated
+in LaMnO$_3$ by taking into account virtual exchange of electrons and phonons.
+The spin and orbital ordering temperatures and the spin wave dispersion
+relation are calculated. We find that the orbital ordering is mainly caused by
+the electronic interactions and that the Jahn-Teller coupling is much smaller
+than that reported previously. We propose that the elastic constant shows a
+characteristic change at the N{\'e}el temperature by the spin and orbital
+coupling and the higher-order Jahn-Teller coupling.",0110534v1
+2022-10-02,Spin-orbit coupling and Kondo resonance in Co adatom on Cu(100) surface: DFT+ED study,"We report density functional theory plus exact diagonalization of the
+multi-orbital Anderson impurity model calculations for the Co adatom on the top
+of Cu(001) surface. For the Co atom $d$-shell occupation $n_d \approx$ 8, a
+singlet many-body ground state and Kondo resonance are found, when the
+spin-orbit coupling is included in the calculations. The differential
+conductance is evaluated in a good agreement with the scanning tuneling
+microscopy measurements. The results illustrate the essential role which the
+spin-orbit coupling is playing in a formation of Kondo singlet for the
+multi-orbital impurity in low dimensions.",2210.00600v1
+2014-03-17,Spin Hall and Edelstein effects in metallic films: from 2D to 3D,"A normal metallic film sandwiched between two insulators may have strong
+spin-orbit coupling near the metal-insulator interfaces, even if spin-orbit
+coupling is negligible in the bulk of the film. In this paper we study two
+technologically important and deeply interconnected effects that arise from
+interfacial spin-orbit coupling in metallic films. The first is the spin Hall
+effect, whereby a charge current in the plane of the film is partially
+converted into an orthogonal spin current in the same plane. The second is the
+Edelstein effect, in which a charge current produces an in-plane, transverse
+spin polarization. At variance with strictly two-dimensional Rashba systems, we
+find that the spin Hall conductivity has a finite value even if spin-orbit
+interaction with impurities is neglected and ""vertex corrections"" are properly
+taken into account. Even more remarkably, such finite value becomes ""universal""
+in a certain configuration. This is a direct consequence of the spatial
+dependence of spin-orbit coupling on the third dimension, perpendicular to the
+film plane. The non-vanishing spin Hall conductivity has a profound influence
+on the Edelstein effect, which we show to consist of two terms, the first with
+the standard form valid in a strictly two-dimensional Rashba system, and a
+second arising from the presence of the third dimension. Whereas the standard
+term is proportional to the momentum relaxation time, the new one scales with
+the spin relaxation time. Our results, although derived in a specific model,
+should be valid rather generally, whenever a spatially dependent Rashba
+spin-orbit coupling is present and the electron motion is not strictly
+two-dimensional.",1403.4195v1
+2008-11-24,Dynamics of Black Hole Pairs II: Spherical Orbits and the Homoclinic Limit of Zoom-Whirliness,"Spinning black hole pairs exhibit a range of complicated dynamical behaviors.
+An interest in eccentric and zoom-whirl orbits has ironically inspired the
+focus of this paper: the constant radius orbits. When black hole spins are
+misaligned, the constant radius orbits are not circles but rather lie on the
+surface of a sphere and have acquired the name ""spherical orbits"". The
+spherical orbits are significant as they energetically frame the distribution
+of all orbits. In addition, each unstable spherical orbit is asymptotically
+approached by an orbit that whirls an infinite number of times, known as a
+homoclinic orbit. A homoclinic trajectory is an infinite whirl limit of the
+zoom-whirl spectrum and has a further significance as the separatrix between
+inspiral and plunge for eccentric orbits. We work in the context of two
+spinning black holes of comparable mass as described in the 3PN Hamiltonian
+with spin-orbit coupling included. As such, the results could provide a testing
+ground of the accuracy of the PN expansion. Further, the spherical orbits could
+provide useful initial data for numerical relativity. Finally, we comment that
+the spinning black hole pairs should give way to chaos around the homoclinic
+orbit when spin-spin coupling is incorporated.",0811.3798v1
+2010-06-07,Duality of the spin and density dynamics for two-dimensional electrons with a spin-orbit coupling,"We study spin dynamics in a two-dimensional electron gas with a pure gauge
+non-Abelian spin-orbit field, for which systems with balanced Rashba and
+Dresselhaus spin-orbit couplings, and the (110)-axis grown GaAs quantum wells
+are typical examples. We demonstrate the duality of the spin evolution and the
+electron-density dynamics in a system without spin-orbit coupling, which
+considerably simplifies and deepens the analysis of spin-dependent processes.
+This duality opens a venue for the understanding of this class of systems,
+highly interesting for their applications in spintronics, through known
+properties of the systems without spin-orbit coupling.",1006.1202v3
+2016-11-04,Limits on dynamically generated spin-orbit coupling: Absence of $l=1$ Pomeranchuk instabilities in metals,"An ordered state in the spin sector that breaks parity without breaking
+time-reversal symmetry, i.e., that can be considered as dynamically generated
+spin-orbit coupling, was proposed to explain puzzling observations in a range
+of different systems. Here we derive severe restrictions for such a state that
+follow from a Ward identity related to spin conservation. It is shown that
+$l=1$ spin-Pomeranchuk instabilities are not possible in non-relativistic
+systems since the response of spin-current fluctuations is entirely incoherent
+and non-singular. This rules out relativistic spin-orbit coupling as an
+emergent low-energy phenomenon. We illustrate the exotic physical properties of
+the remaining higher angular momentum analogues of spin-orbit coupling and
+derive a geometric constraint for spin-orbit vectors in lattice systems.",1611.01442v2
+2018-03-19,Spin-Dependent Conductance in a Junction with Dresselhaus Spin-Orbit Coupling,"We studied spin-dependent conductance in a normal metal (NM)/NM junction with
+Dresselhaus spin-orbit coupling (DSOC) and magnetization. As a reference, we
+also studied the spin-dependent conductance in such a junction with Rashba
+spin-orbit coupling (RSOC). Using a standard scattering method, we calculated
+the gate-voltage dependence of the spin-dependent conductances in DSOC and
+RSOC. In addition, we calculated the gate-voltage dependence of the
+conductances in a ferromagnetic metal (FM)/NM junction with spin-orbit coupling
+and magnetization, which we call ferromagnetic spin-orbit metal (FSOM). From
+these results, we discuss the relation between these conductance in the
+presence of DSOC and that in the presence of RSOC. We found that conductance in
+DSOC is the same as that in RSOC for the NM/FSOM junction. In addition, we
+found that in the FM/FSOM junction, the conductance in DSOC is the same as that
+in RSOC only when the FM magnetization is along the out-of-plane direction.",1803.07091v3
+2020-12-04,Effects of hybridization and spin-orbit coupling to induce odd frequency pairing in two-band superconductors,"The effects of spin independent hybridization potential and spin orbit
+coupling on two band superconductor with equal time s-wave inter band pairing
+order parameter is investigated theoretically. To study symmetry classes in two
+band superconductors the Gorkov equations are solved analytically. By defining
+spin singlet and spin triplet s wave order parameter due to two band degree of
+freedom the symmetry classes of Cooper pair are studied. For spin singlet case
+it is shown that spin independent hybridization generates Cooper pair belongs
+to even frequency spin singlet even momentum even band parity (ESEE) symmetry
+class for both intraband and interband pairing correlations. For spin triplet
+order parameter, intraband pairing correlation generates odd frequency spin
+triplet even momentum even band parity (OTEE) symmetry class whereas, interband
+pairing correlation generates even frequency spin triplet even momentum odd
+band parity ETEO) class. For the spin singlet, spin orbit coupling generates
+pairing correlation that belongs to odd frequency spin singlet odd momentum
+even band parity (OSOE) symmetry class and even frequency spin singlet even
+momentum even band parity (ESEE) for intraband and interband pairing
+correlation respectively. In the spin triplet case for itraband and interband
+correlation, spin orbit coupling generates even-frequency spin triplet odd
+momentum even band parity (ETOE) and even frequency spin triplet even momentum
+odd band parity (ETEO) respectively.",2012.02810v1
+2008-11-25,Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors,"We develop an understanding of the anomalous metal state of the parent
+compounds of recently discovered iron based superconductors starting from a
+strong coupling viewpoint, including orbital degrees of freedom. On the basis
+of an intermediate-spin (S=1) state for the Fe^{2+} ions, we derive a
+Kugel-Khomskii spin-orbital Hamiltonian for the active t_{2g} orbitals. It
+turns out to be a highly complex model with frustrated spin and orbital
+interactions. We compute its classical phase diagrams and provide an
+understanding for the stability of the various phases by investigating its
+spin-only and orbital-only limits. The experimentally observed spin-stripe
+state is found to be stable over a wide regime of physical parameters and can
+be accompanied by three different types of orbital orders. Of these the
+orbital-ferro and orbital-stripe orders are particularly interesting since they
+break the in-plane lattice symmetry -- a robust feature of the undoped
+compounds. We compute the magnetic excitation spectra for the effective spin
+Hamiltonian, observing a strong reduction of the ordered moment, and point out
+that the proposed orbital ordering pattern can be measured in resonant X-ray
+diffraction.",0811.4104v1
+2005-10-07,Theory of orbital state and spin interactions in ferromagnetic titanates,"A spin-orbital superexchange Hamiltonian in a Mott insulator with $t_{2g}$
+orbital degeneracy is investigated. More specifically, we focus on a spin
+ferromagnetic state of the model and study a collective behavior of orbital
+angular momentum. Orbital order in the model occurs in a nontrivial way -- it
+is stabilized exclusively by quantum effects through the order-from-disorder
+mechanism. Several energetically equivalent orbital orderings are identified.
+Some of them are specified by a quadrupole ordering and have no unquenched
+angular momentum at low energy. Other states correspond to a noncollinear
+ordering of the orbital angular momentum and show the magnetic Bragg peaks at
+specific positions. Order parameters are unusually small because of strong
+quantum fluctuations. Orbital contribution to the resonant x-ray scattering is
+discussed. The dynamical magnetic structure factor in different ordered states
+is calculated. Predictions made should help to observe elementary excitations
+of orbitals and also to identify the type of the orbital order in ferromagnetic
+titanates. Including further a relativistic spin-orbital coupling, we derive an
+effective low-energy spin Hamiltonian and calculate a spin-wave spectrum, which
+is in good agreement with recent experimental observations in YTiO$_3$.",0510175v1
+2006-12-01,Gilbert damping and spin Coulomb drag in a magnetized electron liquid with spin-orbit interaction,"We present a microscopic calculation of the Gilbert damping constant for the
+magnetization of a two-dimensional spin-polarized electron liquid in the
+presence of intrinsic spin-orbit interaction. First we show that the Gilbert
+constant can be expressed in terms of the auto-correlation function of the
+spin-orbit induced torque. Then we specialize to the case of the Rashba
+spin-orbit interaction and we show that the Gilbert constant in this model is
+related to the spin-channel conductivity. This allows us to study the Gilbert
+damping constant in different physical regimes, characterized by different
+orderings of the relevant energy scales -- spin-orbit coupling, Zeeman
+coupling, momentum relaxation rate, spin-momentum relaxation rate, spin
+precession frequency -- and to discuss its behavior in various limits.
+Particular attention is paid to electron-electron interaction effects,which
+enter the spin conductivity and hence the Gilbert damping constant via the spin
+Coulomb drag coefficient.",0612015v1
+2011-01-11,Multipole correlations of $t_{\rm 2g}$-orbital Hubbard model with spin-orbit coupling,"We investigate the ground-state properties of a one-dimensional $t_{\rm
+2g}$-orbital Hubbard model including an atomic spin-orbit coupling by using
+numerical methods, such as Lanczos diagonalization and density-matrix
+renormalization group. As the spin-orbit coupling increases, we find a
+ground-state transition from a paramegnetic state to a ferromagnetic state. In
+the ferromagnetic state, since the spin-orbit coupling mixes spin and orbital
+states with complex number coefficients, an antiferro-orbital state with
+complex orbitals appears. According to the appearance of the complex orbital
+state, we observe an enhancement of $\Gamma_{4u}$ octupole correlations.",1101.2055v1
+2012-05-31,Effect of spin-orbit coupling on magnetic and orbital order in MgV$_2$O$_4$,"Recent measurements on MgV$_2$O$_4$ single crystal have reignited the debate
+on the role of spin-orbit (SO) coupling in dictating the orbital order in
+Vanadium spinel systems. Density functional theory calculations were performed
+using the full-potential linearized augmented-plane-wave method within the
+local spin density approximation (LSDA), Coulomb correlated LSDA+U, and with SO
+interaction (LSDA+U+SO) to study the magnetic and orbital ordering in low
+temperature phase of MgV$_2$O$_4$. It is observed that the spin-orbit coupling
+in the experimentally observed antiferromagnetic phase, affects the orbital
+order differently in alternate V-atom chains along c-axis. This observation is
+found to be consistent with the experimental prediction that the effect of
+spin-orbit coupling is intermediate between that in case of ZnV$_2$O$_4$ and
+MnV$_2$O$_4$.",1205.6950v1
+2005-07-29,Interplay between electron spin and orbital pseudospin in double quantum dots,"We investigate theoretically spin and orbital pseudospin magnetic properties
+of a molecular orbital in parabolic and elliptic double quantum dots (DQDs). In
+our many body calculation we include intra- and inter-dot electron-electron
+interactions, in addition to the intradot exchange interaction of `p' orbitals.
+We find for parabolic DQDs that, except for the half or completely filled
+molecular orbital, spins in different dots are ferromagnetically coupled while
+orbital pseudospins are antiferromagnetically coupled. For elliptic DQDs spins
+and pseudospins are either ferromagnetically or antiferromagnetically coupled,
+depending on the number of electrons in the molecular orbital. We have
+determined orbital pseudospin quantum numbers for the groundstates of elliptic
+DQDs. An experiment is suggested to test the interplay between orbital
+pseudospin and spin magnetism.",0507702v1
+2019-11-21,"Evidence for orbital ordering in Ba$_2$NaOsO$_6$, a Mott insulator with strong spin orbit coupling, from First Principles","We present first principles calculations of the magnetic and orbital
+properties of Ba$_2$NaOsO$_6$ (BNOO), a 5$d^1$ Mott insulator with strong spin
+orbit coupling (SOC) in its low temperature emergent quantum phases. Our
+computational method takes into direct consideration recent NMR results that
+established that BNOO develops a local octahedral distortion preceding the
+formation of long range magnetic order. We found that the two-sublattice canted
+ferromagnetic ground state identified in Lu \etal, Nature Comm. {\bf 8}, 14407
+(2017) is accompanied by a two-sublattice staggered orbital ordering pattern in
+which the $t_{2g}$ orbitals are selectively occupied as a result of strong spin
+orbit coupling. The staggered orbital order found here using first principles
+calculations asserts the previous proposal of Chen \etal, Phys. Rev. B {\bf
+82}, 174440 (2010) and Lu \etal, Nature Comm. {\bf 8}, 14407 (2017), that
+two-sublattice magnetic structure is the very manifestation of staggered
+quadrupolar order. Therefore, our results affirm the essential role of
+multipolar spin interactions in the microscopic description of magnetism in
+systems with locally entangled spin and orbital degrees of freedom.",1911.09244v1
+2021-10-21,The spin-spin problem in Celestial Mechanics,"We study the dynamics of two homogeneous rigid ellipsoids subject to their
+mutual gravitational influence. We assume that the spin axis of each ellipsoid
+coincides with its shortest physical axis and is perpendicular to the orbital
+plane. Due to such assumptions, the problem is planar and depends on particular
+parameters of the ellipsoids, most notably, the equatorial oblateness and the
+flattening with respect to the shortest physical axes. We consider two models
+for such configuration: while in the full model, there is a coupling between
+the orbital and rotational motions, in the Keplerian model, the centers of mass
+of the bodies are constrained to move on coplanar Keplerian ellipses. The
+Keplerian case, in the approximation that includes the coupling between the
+spins of the two ellipsoids, is what we call spin-spin problem, that is a
+generalization of the classical spin-orbit problem. In this paper we continue
+the investigations of [Mis21] on the spin-spin problem by comparing it with the
+spin-orbit problem and also with the full model.
+  Beside detailing the models associated to the spin-orbit and spin-spin
+problems, we introduce the notions of standard and balanced resonances, which
+lead us to investigate the existence of periodic and quasi-periodic solutions.
+We also give a qualitative description of the phase space and provide results
+on the linear stability of solutions for the spin-orbit and spin-spin problems.
+We conclude by providing a comparison between the full and the Keplerian models
+with particular reference to the interaction between the rotational and orbital
+motions.",2110.11152v1
+2015-09-21,Nature of Valance Band Splitting on Multilayer MoS2,"Understanding the origin of splitting of valance band is important since it
+governs the unique spin and valley physics in few-layer MoS2. With first
+principle methods, we explore the effects of spin-orbit coupling and layer's
+coupling on few-layer MoS2. It is found that intra-layer spin-orbit coupling
+has a major contribution to the splitting of valance band at K. In double-layer
+MoS2, the layer's coupling results in the widening of energy gap of splitted
+states induced by intra-layer spin-orbit coupling. The valance band splitting
+of bulk MoS_2 in K can follow this model. We also find the effect of
+inter-layer spin-orbit coupling in triple-layer MoS2. In addition, the
+inter-layer spin-orbit coupling is found to become to be stronger under the
+pressure and results in the decrease of main energy gap in the splitting
+valance bands at K.",1509.06118v1
+2016-07-06,Orbital mapping of energy bands and the truncated spin polarization in three-dimensional Rashba semiconductors,"Associated with spin-orbit coupling (SOC) and inversion symmetry breaking,
+Rashba spin polarization opens a new avenue for spintronic applications that
+was previously limited to ordinary magnets. However, spin polarization effects
+in actual Rashba systems are far more complicated than what conventional
+single-orbital models would suggest. By studying via first-principles DFT and a
+multi-orbital k.p model a 3D bulk Rashba system (free of complications by
+surface effects) we find that the physical origin of the leading spin
+polarization effects is SOC-induced hybridization between spin and multiple
+orbitals, especially those with nonzero orbital angular momenta. In this
+framework we establish a general understanding of the orbital mapping, common
+to the surface of topological insulators and Rashba system. Consequently, the
+intrinsic mechanism of various spin polarization effects, which pertain to all
+Rashba systems even those with global inversion symmetry, is understood as a
+manifestation of the orbital textures. This finding suggests a route for
+designing high spin-polarization materials by considering the atomic-orbital
+content.",1607.01692v2
+2015-01-16,Entanglement Driven Phase Transitions in Spin-Orbital Models,"To demonstrate the role played by the von Neumann entropy spectra in quantum
+phase transitions we investigate the one-dimensional anisotropic SU(2)$\otimes
+XXZ$ spin-orbital model with negative exchange parameter. In the case of
+classical Ising orbital interactions we discover an unexpected novel phase with
+Majumdar-Ghosh-like spin-singlet dimer correlations triggered by spin-orbital
+entanglement and having $k=\pi/2$ orbital correlations, while all the other
+phases are disentangled. For anisotropic $XXZ$ orbital interactions both
+spin-orbital entanglement and spin-dimer correlations extend to the
+antiferro-spin/alternating-orbital phase. This quantum phase provides a unique
+example of two coupled order parameters which change the character of the phase
+transition from first-order to continuous. Hereby we have established the von
+Neumann entropy spectral function as a valuable tool to identify the change of
+ground state degeneracies and of the spin-orbital entanglement of elementary
+excitations in quantum phase transitions.",1501.04022v3
+2009-07-13,A virtual intersubband spin-flip spin-orbit coupling induced spin relaxation in GaAs (110) quantum wells,"A spin relaxation mechanism is proposed based on a second-order spin-flip
+intersubband spin-orbit coupling together with the spin-conserving scattering.
+The corresponding spin relaxation time is calculated via the Fermi golden rule.
+It is shown that this mechanism is important in symmetric GaAs (110) quantum
+wells with high impurity density. The dependences of the spin relaxation time
+on electron density, temperature and well width are studied with the underlying
+physics analyzed.",0907.2092v2
+2006-09-19,Far Infrared absorption of non center of mass modes and optical sum rule in a few electron quantum dot with Rashba spin-orbit coupling,"Spin-orbit interaction in a quantum dot couples far infrared radiation to non
+center of mass excitation modes, even for parabolic confinement and dipole
+approximation. The intensities of the absorption peaks satisfy the optical sum
+rule, giving direct information on the total number of electrons inside the
+dot. In the case of a circularly polarized radiation the sum rule is
+insensitive to the strength of a Rashba spin-orbit coupling due to an electric
+field orthogonal to the dot plane, but not to other sources of spin-orbit
+interaction, thus allowing to discriminate between the two.",0609456v1
+2012-02-08,Role of spin-orbit coupling on the electronic structure and properties of SrPtAs,"The effect of spin-orbit coupling on the electronic structure of the layered
+iron-free pnictide superconductor, SrPtAs, has been studied using the full
+potential linearized augmented plane wave method. The anisotropy in Fermi
+velocity, conductivity and plasma frequency stemming from the layered structure
+are found to be enhanced by spin-orbit coupling. The relationship between
+spin-orbit interaction and the lack of two-dimensional inversion in the PtAs
+layers is analyzed within a tight-binding Hamiltonian based on the
+first-principles calculations. Finally, the band structure suggests that
+electron doping could increase $T_c$.",1202.1604v1
+2013-02-22,Anderson Localization of cold atomic gases with effective spin-orbit interaction in a quasiperiodic optical lattice,"We theoretically investigate the localization properties of a spin-orbit
+coupled spin-1/2 particle moving in a one-dimensional quasiperiodic potential,
+which can be experimentally implemented using cold atoms trapped in a
+quasiperiodic optical lattice potential and external laser fields. We present
+the phase diagram in the parameter space of the disorder strength and those
+related to the spin-orbit coupling. The phase diagram is verified via
+multifractal analysis of the atomic wavefunctions and the numerical simulation
+of diffusion dynamics. We found that spin-orbit coupling can lead to the
+spectra mixing (coexistence of extended and localized states) and the
+appearance of mobility edges.",1302.5465v1
+2015-11-10,Boundary conditions and Green function approach of the spin-orbit interaction in the graphitic nanocone,"The boundary effects affecting the Hamiltonian for the nanocone with
+curvatureinduced spin orbit coupling were considered and the corresponding
+electronic structure was calculated. These boundary effects include the spin
+orbit coupling, the electron mass acquisition and the Coulomb interaction.
+Different numbers of the pentagonal defects in the tip were considered. The
+Green function approach into the second order was used for getting more precise
+results in the case of the spin orbit coupling.",1511.03004v2
+2012-01-23,Strong Enhancement of Rashba spin-orbit coupling with increasing anisotropy in the Fock-Darwin states of a quantum dot,"We have investigated the electronic properties of elliptical quantum dots in
+a perpendicular external magnetic field, and in the presence of the Rashba
+spin-orbit interaction. Our work indicates that the Fock-Darwin spectra display
+strong signature of Rashba spin-orbit coupling even for a low magnetic field,
+as the anisotropy of the quantum dot is increased. An explanation of this
+pronounced effect with respect to the anisotropy is presented. The strong
+spin-orbit coupling effect manifests itself prominently in the corresponding
+dipole-allowed optical transitions, and hence is susceptible to direct
+experimental observation.",1201.4842v2
+2005-06-09,Screening in the two-dimensional electron gas with spin-orbit coupling,"We study the interplay between electron-electron interaction and Rashba
+spin-orbit coupling in the two-dimensional electron gas. Using the random phase
+approximation we predict new screening properties of the electron gas which
+result in extension of the region of particle-hole excitations and in
+spin-orbit induced suppression of collective modes. In particular, we observe
+that the spin-orbit coupling gives a finite lifetime to plasmons and
+longitudinal optical phonons, which can be resolved in inelastic Raman
+scattering. We evaluate the experimentally measurable dynamic structure factor
+and estimate the range of parameters where the described phenomena are mostly
+pronounced.",0506227v2
+2009-11-17,Large polaron formation induced by Rashba spin-orbit coupling,"Here the electron-phonon Holstein model with Rashba spin-orbit interaction is
+studied for a two dimensional square lattice in the adiabatic limit. It is
+demonstrated that a delocalized electron at zero spin-orbit coupling localizes
+into a large polaron state as soon as the Rashba term is nonzero. This
+spin-orbit induced polaron state has localization length inversely proportional
+to the Rashba coupling $\gamma$, and it dominates a wide region of the
+$\gamma$-$\lambda$ phase diagram, where $\lambda$ is the electron-phonon
+interaction.",0911.3206v2
+2008-03-06,Effective one body approach to the dynamics of two spinning black holes with next-to-leading order spin-orbit coupling,"Using a recent, novel Hamiltonian formulation of the gravitational
+interaction of spinning binaries, we extend the Effective One Body (EOB)
+description of the dynamics of two spinning black holes to next-to-leading
+order (NLO) in the spin-orbit interaction. The spin-dependent EOB Hamiltonian
+is constructed from four main ingredients: (i) a transformation between the
+``effective'' Hamiltonian and the ``real'' one, (ii) a generalized effective
+Hamilton-Jacobi equation involving higher powers of the momenta, (iii) a
+Kerr-type effective metric (with Pad\'e-resummed coefficients) which depends on
+the choice of some basic ``effective spin vector'' $\bf{S}_{\rm eff}$, and
+which is deformed by comparable-mass effects, and (iv) an additional effective
+spin-orbit interaction term involving another spin vector $\bsigma$. As a first
+application of the new, NLO spin-dependent EOB Hamiltonian, we compute the
+binding energy of circular orbits (for parallel spins) as a function of the
+orbital frequency, and of the spin parameters. We also study the
+characteristics of the last stable circular orbit: binding energy, orbital
+frequency, and the corresponding dimensionless spin parameter $\hat{a}_{\rm
+LSO}\equiv c J_{\rm LSO}/\boldsymbol(G(H_{\rm LSO}/c^2)^2\boldsymbol)$. We find
+that the inclusion of NLO spin-orbit terms has a significant ``moderating''
+effect on the dynamical characteristics of the circular orbits for large and
+parallel spins.",0803.0915v1
+2012-05-30,Conservation law in noncommutative geometry -- Application to spin-orbit coupled systems,"The quantization scheme by noncommutative geometry developed in string theory
+is applied to establish the conservation law of twisted spin and spin current
+densities in the spin-orbit coupled systems. Starting from the pedagogical
+introduction to Hopf algebra and deformation quantization, the detailed
+derivation of the conservation law is given.",1205.6629v1
+2002-08-29,Semiclassical spin coherent state method in the weak spin-orbit coupling limit,"We apply the semiclassical spin coherent state method for the density of
+states by Pletyukhov et al. (2002) in the weak spin-orbit coupling limit and
+recover the modulation factor in the semiclassical trace formula found by Bolte
+and Keppeler (1998, 1999).",0208047v1
+2022-03-23,Effects of a single impurity in a Luttinger liquid with spin-orbit coupling,"In quasi-1D conducting nanowires spin-orbit coupling destructs spin-charge
+separation, intrinsic to Tomonaga-Luttinger liquid (TLL). We study
+renormalization of a single scattering impurity in a such liquid. Performing
+bosonization of low-energy excitations and exploiting perturbative
+renormalization analysis we extend the phase portrait in $K_s$ - $K_c$ space,
+obtained previously for TLL with decoupled spin-charge channels.",2203.12263v1
+2015-05-29,Topological Surface States Originated Spin-Orbit Torques in Bi2Se3,"Three dimensional topological insulator bismuth selenide (Bi2Se3) is expected
+to possess strong spin-orbit coupling and spin-textured topological surface
+states, and thus exhibit a high charge to spin current conversion efficiency.
+We evaluate spin-orbit torques in Bi2Se3/Co40Fe40B20 devices at different
+temperatures by spin torque ferromagnetic resonance measurements. As
+temperature decreases, the spin-orbit torque ratio increases from ~ 0.047 at
+300 K to ~ 0.42 below 50 K. Moreover, we observe a significant out-of-plane
+torque at low temperatures. Detailed analysis indicates that the origin of the
+observed spin-orbit torques is topological surface states in Bi2Se3. Our
+results suggest that topological insulators with strong spin-orbit coupling
+could be promising candidates as highly efficient spin current sources for
+exploring next generation of spintronic applications.",1505.07937v1
+1995-06-08,Coalescing binary systems of compact objects to (post)$^{5/2}-Newtonian order. V. Spin Effects,"We examine the effects of spin-orbit and spin-spin coupling on the inspiral
+of a coalescing binary system of spinning compact objects and on the
+gravitational radiation emitted therefrom. Using a formalism developed by
+Blanchet, Damour, and Iyer, we calculate the contributions due to the spins of
+the bodies to the symmetric trace-free radiative multipole moments which are
+used to calculate the waveform, energy loss, and angular momentum loss from the
+inspiralling binary. Using equations of motion which include terms due to
+spin-orbit and spin-spin coupling, we evolve the orbit of a coalescing binary
+and use the orbit to calculate the emitted gravitational waveform. We find the
+spins of the bodies affect the waveform in several ways: 1) The spin terms
+contribute to the orbital decay of the binary, and thus to the accumulated
+phase of the gravitational waveform. 2) The spins cause the orbital plane to
+precess, which changes the orientation of the orbital plane with respect to an
+observer, thus causing the shape of the waveform to be modulated. 3) The spins
+contribute directly to the amplitude of the waveform. We discuss the size and
+importance of spin effects for the case of two coalescing neutron stars, and
+for the case of a neutron star orbiting a rapidly rotating $10M_\odot$ black
+hole.",9506022v1
+2021-06-02,Enhanced spin-orbit coupling and orbital moment in ferromagnets by electron correlations,"In atomic physics, the Hund rule says that the largest spin and orbital state
+is realized due to the interplay of the spin-orbit coupling (SOC) and the
+Coulomb interactions. Here, we show that in ferromagnetic solids the effective
+SOC and the orbital magnetic moment can be dramatically enhanced by a factor of
+$1/[1-(2U^\prime-U-J_H)\rho_0]$, where $U$ and $U^\prime$ are the on-site
+Coulomb interaction within the same oribtals and between different orbitals,
+respectively, $J_H$ is the Hund coupling, and $\rho_0$ is the average density
+of states. This factor is obtained by using the two-orbital as well as
+five-orbital Hubbard models with SOC. We also find that the spin polarization
+is more favorable than the orbital polarization, being consistent with
+experimental observations. This present work provides a fundamental basis for
+understanding the enhancements of SOC and orbital moment by Coulomb
+interactions in ferromagnets, which would have wide applications in
+spintronics.",2106.01046v1
+2017-11-07,Spin-Orbit Coupling and Magnetic Anisotropy in Iron-Based Superconductors,"We determine theoretically the effect of spin-orbit coupling on the magnetic
+excitation spectrum of itinerant multi-orbital systems, with specific
+application to iron-based superconductors. Our microscopic model includes a
+realistic ten-band kinetic Hamiltonian, atomic spin-orbit coupling, and
+multi-orbital Hubbard interactions. Our results highlight the remarkable
+variability of the resulting magnetic anisotropy despite constant spin-orbit
+coupling. At the same time, the magnetic anisotropy exhibits robust universal
+behavior upon changes in the bandstructure corresponding to different materials
+of iron-based superconductors. A natural explanation of the observed
+universality emerges when considering optimal nesting as a resonance
+phenomenon. Our theory is also of relevance to other itinerant system with
+spin-orbit coupling and nesting tendencies in the bandstructure.",1711.02460v1
+2008-09-30,Multi-terminal Spin Transport: Non applicability of linear response and Equilibrium spin currents,"We present generalized scattering theory for multi-terminal spin transport in
+systems with broken SU(2) symmetry either due to spin-orbit
+interaction,magnetic impurities or magnetic leads. We derive equation for spin
+current consistent with charge conservation. It is shown that resulting spin
+current equations can not be expressed as difference of potential pointing to
+{\it non applicability of linear response for spin currents} and as a
+consequence equilibrium spin currents(ESC) in the leads are non zero. We
+illustrate the theory by calculating ESC in two terminal normal system in
+presence of Rashba spin orbit coupling and show that it leads to spin
+rectification consistent with the non linear nature of spin transport.",0809.5119v1
+2003-12-16,Three-body spin-orbit forces from chiral two-pion exchange,"Using chiral perturbation theory, we calculate the density-dependent
+spin-orbit coupling generated by the two-pion exchange three-nucleon
+interaction involving virtual $\Delta$-isobar excitation. From the
+corresponding three-loop Hartree and Fock diagrams we obtain an isoscalar
+spin-orbit strength $F_{\rm so}(k_f)$ which amounts at nuclear matter
+saturation density to about half of the empirical value of $90 $MeVfm$^5$. The
+associated isovector spin-orbit strength $G_{\rm so}(k_f)$ comes out about a
+factor of 20 smaller. Interestingly, this three-body spin-orbit coupling is not
+a relativistic effect but independent of the nucleon mass $M$. Furthermore, we
+calculate the three-body spin-orbit coupling generated by two-pion exchange on
+the basis of the most general chiral $\pi\pi NN$-contact interaction. We find
+similar (numerical) results for the isoscalar and isovector spin-orbit
+strengths $F_{\rm so}(k_f)$ and $G_{\rm so}(k_f)$ with a strong dominance of
+the p-wave part of the $\pi\pi NN$-contact interaction and the Hartree
+contribution.",0312058v1
+2011-08-21,Vortices in spin-orbit-coupled Bose-Einstein condensates,"Realistic methods to create vortices in spin-orbit-coupled Bose-Einstein
+condensates are discussed. It is shown that, contrary to common intuition,
+rotation of the trap containing a spin-orbit condensate does not lead to an
+equilibrium state with static vortex structures, but gives rise instead to
+non-equilibrium behavior described by an intrinsically time-dependent
+Hamiltonian. We propose here the following alternative methods to induce
+thermodynamically stable static vortex configurations: (1) to rotate both the
+lasers and the anisotropic trap; and (2) to impose a synthetic Abelian field on
+top of synthetic spin-orbit interactions. Effective Hamiltonians for spin-orbit
+condensates under such perturbations are derived for most currently known
+realistic laser schemes that induce synthetic spin-orbit couplings. The
+Gross-Pitaevskii equation is solved for several experimentally relevant
+regimes. The new interesting effects include spatial separation of left- and
+right-moving spin-orbit condensates, the appearance of unusual vortex
+arrangements, and parity effects in vortex nucleation where the topological
+excitations are predicted to appear in pairs. All these phenomena are shown to
+be highly non-universal and depend strongly on a specific laser scheme and
+system parameters.",1108.4212v1
+2016-10-07,Spin-orbit coupling controlled $J=3/2$ electronic ground state in 5$d^{3}$ oxides,"Entanglement of spin and orbital degrees of freedom drives the formation of
+novel quantum and topological physical states. Discovering new spin-orbit
+entangled ground states and emergent phases of matter requires both
+experimentally probing the relevant energy scales and applying suitable
+theoretical models. Here we report resonant inelastic x-ray scattering
+measurements of the transition metal oxides Ca$_3$LiOsO$_6$ and Ba$_2$YOsO$_6$.
+We invoke an intermediate coupling approach that incorporates both spin-orbit
+coupling and electron-electron interactions on an even footing and reveal the
+ground state of $5d^3$ based compounds, which has remained elusive in
+previously applied models, is a novel spin-orbit entangled J=3/2 electronic
+ground state. This work reveals the hidden diversity of spin-orbit controlled
+ground states in 5d systems and introduces a new arena in the search for
+spin-orbit controlled phases of matter.",1610.02375v1
+2017-01-13,Bose-Einstein condensates in the presence of Weyl spin-orbit coupling,"We consider two-component Bose-Einstein condensates subject to Weyl
+spin-orbit coupling. We obtain mean-field ground state phase diagram by
+variational method. In the regime where interspecies coupling is larger than
+intraspecies coupling, the system is found to be fully polarized and condensed
+at a finite momentum lying along the quantization axis. We characterize this
+phase by studying the excitation spectrum, the sound velocity, the quantum
+depletion of condensates, the shift of ground state energy, and the static
+structure factor. We find that spin-orbit coupling and interspecies coupling
+generally leads to competing effects.",1701.03673v1
+2021-05-10,Self-Bound Quantum Droplet with Internal Stripe Structure in 1D Spin-Orbit-Coupled Bose Gas,"We study the quantum-droplet state in a 3-dimensional (3D) Bose gas in the
+presence of 1D spin-orbit-coupling and Raman coupling, especially the stripe
+phase with density modulation, by numerically computing the ground state energy
+including the mean-field energy and Lee-HuangYang correction. In this droplet
+state, the stripe can exist in a wider range of Raman coupling, compared with
+the BEC-gas state. More intriguingly, both spin-orbit-coupling and Raman
+coupling strengths can be used to tune the droplet density.",2105.04172v1
+2004-05-12,The role of orbital dynamics in spin relaxation and weak antilocalization in quantum dots,"We develop a semiclassical theory for spin-dependent quantum transport to
+describe weak (anti)localization in quantum dots with spin-orbit coupling. This
+allows us to distinguish different types of spin relaxation in systems with
+chaotic, regular, and diffusive orbital classical dynamics. We find, in
+particular, that for typical Rashba spin-orbit coupling strengths, integrable
+ballistic systems can exhibit weak localization, while corresponding chaotic
+systems show weak antilocalization. We further calculate the magnetoconductance
+and analyze how the weak antilocalization is suppressed with decreasing quantum
+dot size and increasing additional in-plane magnetic field.",0405266v2
+2023-04-25,Designing Valley-Dependent Spin-Orbit Interaction by Curvature,"We construct a general theoretical framework for describing curvature-induced
+spin-orbit interactions on the basis of group theory. Our theory can
+systematically determine the emergence of spin splitting in the band structure
+according to symmetry in the wavenumber space and the bending direction of the
+material. As illustrative examples, we derive the curvature-induced spin-orbit
+coupling for carbon and silicon nanotubes. Our theory offers a strategy for
+designing valley-contrasting spin-orbit coupled materials by tuning their
+curvatures.",2304.12928v1
+2005-08-03,Spin and orbital valence bond solids in a one-dimensional spin-orbital system: Schwinger boson mean field theory,"A generalized one-dimensional $SU(2)\times SU(2)$ spin-orbital model is
+studied by Schwinger boson mean-field theory (SBMFT). We explore mainly the
+dimer phases and clarify how to capture properly the low temperature properties
+of such a system by SBMFT. The phase diagrams are exemplified. The three dimer
+phases, orbital valence bond solid (OVB) state, spin valence bond solid (SVB)
+state and spin-orbital valence bond solid (SOVB) state, are found to be favored
+in respectively proper parameter regions, and they can be characterized by the
+static spin and pseudospin susceptibilities calculated in SBMFT scheme. The
+result reveals that the spin-orbit coupling of $SU(2)\times SU(2)$ type serves
+as both the spin-Peierls and orbital-Peierles mechanisms that responsible for
+the spin-singlet and orbital-singlet formations respectively.",0508086v1
+2017-11-09,Relativistic Spin-Orbit Interactions of Photons and Electrons,"Laboratory optics, typically dealing with monochromatic light beams in a
+single reference frame, exhibits numerous spin-orbit interaction phenomena due
+to the coupling between the spin and orbital degrees of freedom of light.
+Similar phenomena appear for electrons and other spinning particles. Here we
+examine transformations of paraxial photon and relativistic-electron states
+carrying the spin and orbital angular momenta (AM) under the Lorentz boosts
+between different reference frames. We show that transverse boosts inevitably
+produce a rather nontrivial conversion from spin to orbital AM. The converted
+part is then separated between the intrinsic (vortex) and extrinsic (transverse
+shift or Hall effect) contributions. Although the spin, intrinsic-orbital, and
+extrinsic-orbital parts all point in different directions, such complex
+behavior is necessary for the proper Lorentz transformation of the total AM of
+the particle. Relativistic spin-orbit interactions can be important in
+scattering processes involving photons, electrons, and other relativistic
+spinning particles, as well as when studying light emitted by fast-moving
+bodies.",1711.03255v2
+2003-06-25,Dimerization versus Orbital Moment Ordering in the Mott insulator YVO$_3$,"We use exact diagonalization combined with mean-field theory to investigate
+the phase diagram of the spin-orbital model for cubic vanadates. The spin-orbit
+coupling competes with Hund's exchange and triggers a novel phase, with the
+ordering of $t_{2g}$ orbital magnetic moments stabilized by the tilting of
+VO$_6$ octahedra. It explains qualitatively spin canting and reduction of
+magnetization observed in YVO$_3$. At finite temperature an orbital Peierls
+instability in the $C$-type antiferromagnetic phase induces modulation of
+magnetic exchange constants even in absence of lattice distortions. The
+calculated spin structure factor shows a magnon splitting due to the orbital
+Peierls dimerization.",0306637v1
+2017-06-19,Chiral and Topological Orbital Magnetism of Spin Textures,"Using a semiclassical Green's function formalism, we discover the emergence
+of chiral and topological orbital magnetism in two-dimensional chiral spin
+textures by explicitly finding the corrections to the orbital magnetization,
+proportional to the powers of the gradients of the texture. We show that in the
+absence of spin-orbit coupling, the resulting orbital moment can be understood
+as the electronic response to the emergent magnetic field associated with the
+real-space Berry curvature. By referring to the Rashba model, we demonstrate
+that by tuning the parameters of surface systems the engineering of emergent
+orbital magnetism in spin textures can pave the way to novel concepts in
+orbitronics.",1706.06068v1
+2011-06-18,Orbital order and magnetism of FeNCN,"Based on density functional calculations, we report on the orbital order and
+microscopic magnetic model of FeNCN, a prototype compound for orbital-only
+models. Despite having a similar energy scale, the spin and orbital degrees of
+freedom in FeNCN are only weakly coupled. The ground-state configuration
+features the doubly occupied d_{3z^2-r^2} (a1g) orbital and four
+singly-occupied d orbitals resulting in the spin S=2 on the Fe+2 atoms, whereas
+alternative (Eg') configurations are about 75 meV/f.u. higher in energy.
+Calculated exchange couplings and band gap are in good agreement with the
+available experimental data. Experimental effects arising from possible orbital
+excitations are discussed.",1106.3665v1
+2012-04-17,Compensation effect in carbon nanotube quantum dots coupled to polarized electrodes in the presence of spin-orbit coupling,"We study theoretically the Kondo effect in carbon nanotube quantum dot
+attached to polarized electrodes. Since both spin and orbit degrees of freedom
+are involved in such a system, the electrode polarization contains the spin-
+and orbit-polarizations as well as the Kramers polarization in the presence of
+the spin-orbit coupling. In this paper we focus on the compensation effect of
+the effective fields induced by different polarizations by applying magnetic
+field. The main results are i) while the effective fields induced by the spin-
+and orbit-polarizations remove the degeneracy in the Kondo effect, the
+effective field induced by the Kramers polarization enhances the degeneracy
+through suppressing the spin-orbit coupling; ii) while the effective field
+induced by the spin-polarization can not be compensated by applying magnetic
+field, the effective field induced by the orbit-polarization can be
+compensated; and iii) the presence of the spin-orbit coupling does not change
+the compensation behavior observed in the case without the spin-orbit coupling.
+These results are observable in an ultraclean carbon-nanotube quantum dot
+attached to ferromagnetic contacts under a parallel applied magnetic field
+along the tube axis and it would deepen our understanding on the Kondo physics
+of the carbon nanotube quantum dot.",1204.3728v1
+2014-08-28,Interplay of spin-orbit and hyperfine interactions in dynamical nuclear polarization in semiconductor quantum dots,"We theoretically study the interplay of spin-orbit and hyperfine interactions
+in dynamical nuclear polarization in two-electron semiconductor double quantum
+dots near the singlet $(S)$ - triplet $(T_+)$ anticrossing. The goal of the
+scheme under study is to extend the singlet $(S)$ - triplet $(T_0)$ qubit
+decoherence time $T_2^{*}$ by dynamically transferring the polarization from
+the electron spins to the nuclear spins. This polarization transfer is achieved
+by cycling the electron spins over the $S-T_+$ anticrossing. Here, we
+investigate, both quantitatively and qualitatively, how this hyperfine mediated
+dynamical polarization transfer is influenced by the Rashba and Dresselhaus
+spin-orbit interaction. In addition to $T_2^*$, we determine the singlet return
+probability $P_s$, a quantity that can be measured in experiments. Our results
+suggest that the spin-orbit interaction establishes a mechanism that can
+polarize the nuclear spins in the opposite direction compared to hyperfine
+mediated nuclear spin polarization. In materials with relatively strong
+spin-orbit coupling, this interplay of spin-orbit and hyperfine mediated
+nuclear spin polarizations prevents any notable increase of the $S-T_0$ qubit
+decoherence time $T_2^{*}$.",1408.6700v1
+2020-08-17,Terahertz spin dynamics driven by an optical spin-orbit torque,"Spin torques are at the heart of spin manipulations in spintronic devices.
+Here, we examine the existence of an optical spin-orbit torque, a relativistic
+spin torque originating from the spin-orbit coupling of an oscillating applied
+field with the spins. We compare the effect of the nonrelativistic Zeeman
+torque with the relativistic optical spin-orbit torque for ferromagnetic
+systems excited by a circularly polarised laser pulse. The latter torque
+depends on the helicity of the light and scales with the intensity, while being
+inversely proportional to the frequency. Our results show that the optical
+spin-orbit torque can provide a torque on the spins, which is quantitatively
+equivalent to the Zeeman torque. Moreover, temperature dependent calculations
+show that the effect of optical spin-orbit torque decreases with increasing
+temperature. However, the effect does not vanish in a ferromagnetic system,
+even above its Curie temperature.",2008.07308v2
+2013-12-20,Effects of the spin-orbital coupling on the vacancy-induced magnetism on the honeycomb lattice,"The local magnetism induced by vacancies in the presence of the spin-orbital
+interaction is investigated based on the half-filled Kane-Mele-Hubbard model on
+the honeycomb lattice. Using the self-consistent mean-field theory, we find
+that the spin-orbital coupling will enhance the localization of the spin
+moments near a single vacancy. We further study the magnetic structures along
+the zigzag edges formed by a chain of vacancies. We find that the spin-orbital
+coupling tends to suppress the counter-polarized ferrimagnetic order on the
+upper and lower edges, because of the open of the spin-orbital gap. As a
+result, in the case of the balance number of sublattices, it will suppress
+completely this kind of ferrimagnetic order. But, for the imbalance case, a
+ferrimagnetic order along both edges exists because additional zero modes will
+not be affected by the spin-orbital coupling.",1312.5809v1
+2022-01-26,Magnetoconductance Anisotropies and Aharonov-Casher Phases,"The spin-orbit interaction is a key tool for manipulating and functionalizing
+spin-dependent electron transport. However, the precise value of the spin-orbit
+coupling constant is hard to determine and control. Here we propose a
+measurement of the geometric (Aharonov-Casher) phase of the electron
+wavefunction generated by the spin-orbit coupling as a means to deduce the
+spin-orbit coupling strength in weak links. Unlike other proposed measurements
+of geometric phases, which rely on interference, we show that the anisotropy of
+the magnetoconductance, measured at different directions of an external
+magnetic field,is determined by the geometric phase. Specifically we consider
+weak links in which the Rashba interaction is caused by an external electric
+field, but our method is expected to apply also for other forms of the
+spin-orbit coupling. Measuring this magnetoconductance anisotropy thus allows
+calibrating Rashba spintronic devices by an external electric field that tunes
+the spin-orbit interaction.",2201.10845v2
+2020-12-13,Pure Bulk Orbital and Spin Photocurrent in Two-Dimensional Ferroelectric Materials,"We elucidate light-induced orbital and spin current through nonlinear
+response theory, which generalizes the well-known bulk photovoltaic effect in
+centrosymmetric broken materials from charge to the spin and orbital degrees of
+freedom. We use two-dimensional nonmagnetic ferroelectric materials (such as
+GeS and its analogues) to illustrate this bulk orbital/spin photovoltaic
+effect, through first-principles calculations. These materials possess a
+vertical mirror symmetry and time-reversal symmetry but lack of inversion
+symmetry. We reveal that in addition to the conventional photocurrent that
+propagates parallel to the mirror plane (under linearly polarized light), the
+symmetric forbidden current perpendicular to the mirror actually contains
+electron flows, which carry angular momentum information and move oppositely.
+One could observe a pure orbital moment current with zero electric charge
+current. This hidden photo-induced orbital current leads to a pure spin current
+via spin-orbit coupling interactions. Therefore, a four-terminal device can be
+designed to detect and measure photo-induced charge, orbital, and spin currents
+simultaneously. All these currents couple with electric polarization $P$, hence
+their amplitude and direction can be manipulated through ferroelectric phase
+transition. Our work provides a route to generalizing nanoscale devices from
+their photo-induced electronics to orbitronics and spintronics.",2012.06933v1
+2013-08-06,Chirality from interfacial spin-orbit coupling effects in magnetic bilayers,"As nanomagnetic devices scale to smaller sizes, spin-orbit coupling due to
+the broken structural inversion symmetry at interfaces becomes increasingly
+important. Here we study interfacial spin-orbit coupling effects in magnetic
+bilayers using a simple Rashba model. The spin-orbit coupling introduces
+chirality into the behavior of the electrons and through them into the
+energetics of the magnetization. In the derived form of the magnetization
+dynamics, all of the contributions that are linear in the spin-orbit coupling
+follow from this chirality, considerably simplifying the analysis. For these
+systems, an important consequence is a correlation between the
+Dzyaloshinskii-Moriya interaction and the spin-orbit torque. We use this
+correlation to analyze recent experiments.",1308.1198v2
+2014-03-11,Renormalization of anticrossings in interacting quantum wires with Rashba and Dresselhaus spin-orbit couplings,"We discuss how electron-electron interactions renormalize the spin-orbit
+induced anticrossings between different subbands in ballistic quantum wires.
+Depending on the ratio of spin-orbit coupling and subband spacing,
+electron-electron interactions can either increase or decrease anticrossing
+gaps. When the anticrossings are closing due to a special combination of Rashba
+and Dresselhaus spin-orbit couplings, their gap approaches zero as an
+interaction dependent power law of the spin-orbit couplings, which is a
+consequence of Luttinger liquid physics. Monitoring the closing of the
+anticrossings allows to directly measure the related renormalization group
+scaling dimension in an experiment. If a magnetic field is applied parallel to
+the spin-orbit coupling direction, the anticrossings experience different
+renormalizations. Since this difference is entirely rooted in electron-electron
+interactions, unequally large anticrossings also serve as a direct signature of
+Luttinger liquid physics. Electron-electron interactions furthermore increase
+the sensitivity of conductance measurements to the presence of anticrossing.",1403.2759v2
+2016-11-15,Surface orbitronics: new twists from orbital Rashba physics,"When the inversion symmetry is broken at a surface, spin-orbit interaction
+gives rise to spin-dependent energy shifts - a phenomenon which is known as the
+spin Rashba effect. Recently, it has been recognized that an orbital
+counterpart of the spin Rashba effect - the orbital Rashba effect - can be
+realized at surfaces even without spin- orbit coupling. Here, we propose a
+mechanism for the orbital Rashba effect based on sp orbital hybridization,
+which ultimately leads to the electric polarization of surface states. As a
+proof of principle, we show from first principles that this effect leads to
+chiral orbital textures in $\mathbf{k}$-space of the BiAg$_2$ monolayer. In
+predicting the magnitude of the orbital moment arising from the orbital Rashba
+effect, we demonstrate the crucial role that the Berry phase theory plays for
+the magnitude and variation of the orbital textures. As a result, we predict a
+pronounced manifestation of various orbital effects at surfaces, and proclaim
+the orbital Rashba effect to be a key platform for surface orbitronics.",1611.04674v1
+2002-08-22,"Spin-Orbit Coupling, Antilocalization, and Parallel Magnetic Fields in Quantum Dots","We investigate antilocalization due to spin-orbit coupling in ballistic GaAs
+quantum dots. Antilocalization that is prominent in large dots is suppressed in
+small dots, as anticipated theoretically. Parallel magnetic fields suppress
+both antilocalization and also, at larger fields, weak localization, consistent
+with random matrix theory results once orbital coupling of the parallel field
+is included. In situ control of spin-orbit coupling in dots is demonstrated as
+a gate-controlled crossover from weak localization to antilocalization.",0208436v2
+2022-11-09,Giant efficiency of long-range orbital torque in Co/Nb bilayers,"We report unambiguously experimental evidence of a strong orbital current in
+Nb films with weak spin-orbit coupling via the spin-torque ferromagnetic
+resonance (ST-FMR) spectrum for Fe/Nb and Co/Nb bilayers. The sign change of
+the damping-like torque in Co/Nb demonstrates a large spin-orbit correlation
+and thus great efficiency of orbital torque in Co/Nb. By studying the
+efficiency as a function of the thickness of Nb sublayer, we reveal a long
+orbital diffusion length (~3.1 nm) of Nb. Further planar Hall resistance (PHE)
+measurements at positive and negative applying current confirm the nonlocal
+orbital transport in ferromagnetic-metal/Nb heterostructures.",2211.04809v1
+2006-08-13,Spin-orbit interactions in black-hole binaries,"We perform numerical simulations of black-hole binaries to study the exchange
+of spin and orbital angular momentum during the last, highly nonlinear, stages
+of the coalescence process. To calculate the transfer of angular momentum from
+orbital to spin, we start with two quasi-circular configurations, one with
+initially non-spinning black holes, the other with corotating black holes. In
+both cases the binaries complete almost two orbits before merging. We find
+that, during these last orbits, the specific spin (a/m) of each horizon
+increases by only 0.012 for the initially non-spinning configuration, and by
+only 0.006 for the initially corotating configuration. By contrast, the
+corotation value for the specific spin should increase from 0.1 at the initial
+proper separation of 10M to 0.33 when the proper separation is 5M. Thus the
+spin-orbit coupling is far too weak to tidally lock the binary to a corotating
+state during the late-inspiral phase. We also study the converse transfer from
+spin into orbital motion. In this case, we start the simulations with parallel,
+highly-spinning non-boosted black holes. As the collision proceeds, the system
+acquires a non-head-on orbital motion, due to spin-orbit coupling, that leads
+to the radiation of angular momentum. We are able to accurately measure the
+energy and angular momentum losses and model their dependence on the initial
+spins.",0608275v4
+2003-10-14,Spin-Hall and spin-diagonal conductivity in the presence of Rashba and Dresselhaus spin-orbit coupling,"We investigate the spin-current linear response conductivity tensor to an
+electric field in a paramagnetic two dimensonal electron gas with both Rashba
+and Dresselhaus spin-orbit coupling in the weak scattering regime. In the
+ususal case where both spin-orbit-split bands are occupied, we find that the
+spin-Hall conductivity depends only on the sign of the difference in magnitude
+of the Rashba and Dresselhaus coupling strengths except within a narrow window
+where both coupling strengths are equal. We also find a new effect in which a
+spin current is generated in the direction of the driving field whenever the
+Dresselhaus spin-orbit coupling is nonzero. We discuss experimental
+implications of this finding taking into account the finite mobility and
+typical parameters of current samples and possible experimental set ups for its
+detection.",0310315v1
+2007-01-17,Spin polarization effects in a two dimensional mesoscopic electronic structure with Rashba spin-orbit and lateral confinement,"Because of the peculiar coupling of spatial and spin degrees of freedom
+effected by the Rashba spin-orbit interaction, lateral confinement of a two
+dimensional electronic system leads to a finite transverse spin polarization
+near the longitudinal edges of a current carrying quantum wire. The sign of
+this component of the polarization is opposite at the two edges and can be
+reversed upon inversion of the current. Interestingly for small spin orbit
+coupling this is the largest contribution to the total polarization, its
+magnitude being of second order in the coupling constant. As a consequence this
+phenomenon cannot be revealed in lowest order perturbative approaches. An in
+plane spin polarization component is also present that is perpendicular to the
+current. Within the same model this component would be also present in the
+bulk. On the other hand while in the latter case its magnitude is linear in the
+coupling constant, we find that it only represents a third order effect in the
+wire geometry. Our results are consistent with a general rigorous argument on
+the parity of the components of the spin polarization with respect to the sign
+of the spin orbit coupling constant.",0701415v1
+2017-08-24,Magnetization in pristine graphene with Zeeman splitting and variable spin-orbit coupling,"The aim of this work is to describe the spin magnetization of graphene with
+Rashba spinorbit coupling and Zeeman effect. It is shown that the magnetization
+depends critically on the spin-orbit coupling l that is controlled with an
+external electric field. In turn, by manipulating the density of charge
+carriers, it is shown that spin up and down Landau levels mix introducing jumps
+in the spin magnetization. Two magnetic oscillations phases are described that
+can be tunable through the applied external fields. The maximum and minimum of
+the oscillations can be alternated by taking into account how the energy levels
+are filled when the Rashba-spin-orbit coupling is turned on. The results
+obtained are of importance to design superlattices with variable spin-orbit
+coupling with different configurations in which spin oscillations and spin
+filters can be developed.",1708.07574v1
+2015-08-04,Spin structure of harmonically trapped one-dimensional atoms with spin-orbit coupling,"We introduce a theoretical approach to determine the spin structure of
+harmonically trapped atoms with two-body zero-range interactions subject to an
+equal mixture of Rashba and Dresselhaus spin-orbit coupling created through
+Raman coupling of atomic hyperfine states. The spin structure of bosonic and
+fermionic two-particle systems with finite and infinite two-body interaction
+strength $g$ is calculated. Taking advantage of the fact that the $N$-boson and
+$N$-fermion systems with infinitely large coupling strength $g$ are
+analytically solvable for vanishing spin-orbit coupling strength $k_{so}$ and
+vanishing Raman coupling strength $\Omega$, we develop an effective spin model
+that is accurate to second-order in $\Omega$ for any $k_{so}$ and infinite $g$.
+The three- and four-particle systems are considered explicitly. It is shown
+that the effective spin Hamiltonian, which contains a Heisenberg exchange term
+and an anisotropic Dzyaloshinskii-Moriya exchange term, describes the
+transitions that these systems undergo with the change of $k_{so}$ as a
+competition between independent spin dynamics and nearest-neighbor spin
+interactions.",1508.00932v1
+2022-06-01,Substrate Effects on Spin Relaxation in Two-Dimensional Dirac Materials with Strong Spin-Orbit Coupling,"Understanding substrate effects on spin dynamics and relaxation in
+two-dimensional (2D) materials is of key importance for spintronics and quantum
+information applications. However, the key factors that determine the substrate
+effect on spin relaxation, in particular for materials with strong spin-orbit
+coupling, have not been well understood. Here we performed first-principles
+real-time density-matrix dynamics simulations with spin-orbit coupling (SOC)
+and quantum descriptions of electron-phonon and electron-impurity scattering
+for the spin lifetimes of supported/free-standing germanene, a prototypical
+strong SOC 2D Dirac material. We show that the effects of different substrates
+on spin lifetime can surprisingly differ by two orders of magnitude. We find
+that substrate effects on $\tau_s$ are closely related to substrate-induced
+modifications of the SOC-field anisotropy, which changes the spin-flip
+scattering matrix elements. We propose a new electronic quantity, named
+spin-flip angle $\theta^{\uparrow\downarrow}$, to characterize spin relaxation
+caused by intervalley spin-flip scattering. We find that the spin relaxation
+rate is approximately proportional to the averaged value of
+$\mathrm{sin}^{2}\left(\theta^{\uparrow\downarrow}/2\right)$, which can be used
+as a guiding parameter of controlling spin relaxation.",2206.00784v2
+2023-08-23,Spin pumping from a ferromagnetic insulator into an altermagnet,"A class of antiferromagnets with spin-polarized electron bands, yet zero net
+magnetization, called altermagnets is attracting increasing attention due to
+their potential use in spintronics. Here, we study spin injection into an
+altermagnet via spin pumping from a ferromagnetic insulator. We find that the
+spin pumping behaves qualitatively different depending on how the altermagnet
+is crystallographically oriented relative the interface to the ferromagnetic
+insulator. The altermagnetic state can enhance or suppress spin pumping, which
+we explain in terms of spin-split altermagnetic band structure and the
+spin-flip probability for the incident modes. Including the effect of
+interfacial Rashba spin-orbit coupling, we find that the spin-pumping effect is
+in general magnified, but that it can display a non-monotonic behavior as a
+function of the spin-orbit coupling strength. We show that there exists an
+optimal value of the spin-orbit coupling strength which causes an order of
+magnitude increase in the pumped spin current, even for the crystallographic
+orientation of the altermagnet which suppresses the spin pumping.",2308.12335v1
+2006-06-07,Spin-Orbital Entanglement and Phase Diagram of Spin-orbital Chain with $SU(2) \times SU(2)$ Symmetry,"Spin-orbital entanglement in quantum spin-orbital systems is quantified by a
+reduced von Neumann entropy, and is calculated for the ground state of a
+coupled spin-orbital chain with $SU(2)\times SU(2)$ symmetry. By analyzing the
+discontinuity and local extreme of the reduced entropy as functions of the
+model parameters, we deduce a rich phase diagram to describe the quantum phase
+transitions in the model. Our approach provides an efficient and powerful
+method to identify phase boundaries in a system with complex correlation
+between multiply degrees of freedom.",0606194v1
+2001-03-14,Threshold suppression of Lambda spin-orbit splitting,"New experimental data on medium to heavy single Lambda hypernuclei revealed a
+much larger spin-orbit splitting than observed in older measurements of light
+hypernuclei. Taking into account particle threshold effects and the
+density-dependence of in-medium coupling constants the apparent suppression of
+spin-orbit strength in light hypernuclei as well as the spin-orbit structure
+observed in medium to heavy nuclei are explained in a unified manner within the
+density dependent relativistic hadron field theory. It is concluded that the
+most valuable information on the Lambda spin-orbit dynamics in finite nuclei
+has to be extracted from medium to heavy mass nuclei.",0103035v1
+2020-05-11,Effect of the spin-orbit interaction on thermodynamic properties of liquid uranium,"We present the first quantum molecular dynamics calculation of zero-pressure
+isobar of solid and liquid uranium that account for spin-orbit coupling. We
+demonstrate that inclusion of spin-orbit interaction leads to higher degree of
+the thermal expansion of uranium, especially in the liquid phase. Full
+accounting of relativistic effects for valence electrons, particularly
+spin-orbital splitting of the 5f band, is substantial for the reproduction of
+the experimental density of molten uranium at the melting temperature.
+Influence of the spin-orbit interaction on the thermodynamic properties at high
+temperatures and pressures is also analyzed.",2005.05468v1
+2010-05-17,Anomalous spin Hall effects in Dresselhaus (110) quantum wells,"Anomalous spin Hall effects that belong to the intrinsic type in Dresselhaus
+(110) quantum wells are discussed. For the out-of-plane spin component,
+antisymmetric current-induced spin polarization induces opposite spin Hall
+accumulation, even though there is no spin-orbit force due to Dresselhaus (110)
+coupling. A surprising feature of this spin Hall induction is that the spin
+accumulation sign does not change upon bias reversal. Contribution to the spin
+Hall accumulation from the spin Hall induction and the spin deviation due to
+intrinsic spin-orbit force as well as extrinsic spin scattering, can be
+straightforwardly distinguished simply by reversing the bias. For the inplane
+component, inclusion of a weak Rashba coupling leads to a new type of $S_y$
+intrinsic spin Hall effect solely due to spin-orbit-force-driven spin
+separation.",1005.2948v4
+2004-03-22,Spin polarization of electrons with Rashba double-refraction,"We demonstrate how the Rashba spin-orbit coupling in semiconductor
+heterostructures can produce and control a spin-polarized current without
+ferromagnetic leads. Key idea is to use spin-double refraction of an electronic
+beam with a nonzero incidence angle. A region where the spin-orbit coupling is
+present separates the source and the drain without spin-orbit coupling. We show
+how the transmission and the beam spin-polarization critically depend on the
+incidence angle. The transmission halves when the incidence angle is greater
+than a limit angle and a significant spin-polarization appears. Increasing the
+spin-orbit coupling one can obtain the modulation of the intensity and of the
+spin-polarization of the output electronic current when the input current is
+unpolarized. Our analysis shows the possibility to realize a spin-field-effect
+transistor based on the propagation of only one mode with the region with
+spin-orbit coupling. Where the original Datta and Das device [Appl.Phys.Lett.
+{\bf 56}, 665 (1990)] use the spin-precession that originates from the
+interference between two modes with orthogonal spin.",0403534v3
+2020-12-19,Non-orthogonal Spin-Momentum Locking,"Spin-momentum locking is a unique intrinsic feature of strongly spin-orbit
+coupled materials and a key to their promise of applications in spintronics and
+quantum computation. Much of the existing work, in topological and
+non-topological pure materials, has been focused on the orthogonal locking in
+the vicinity of the $\Gamma$ point where the directions of spin and momentum
+vectors are locked perpendicularly. With the orthogonal case, enforced by the
+symmetry in pure systems, mechanisms responsible for non-orthogonal
+spin-momentum locking (NOSML) have drawn little attention, although it has been
+reported on the topological surface of $\alpha$-$Sn$. Here, we demonstrate
+that, the presence of the spin-orbit scattering from dilute spinless impurities
+can produce the NOSML state in the presence of a strong intrinsic spin-orbit
+coupling in the pristine material. We also observe an interesting coupling
+threshold for the NOSML state to occur.
+  The relevant parameter in our analysis is the deflection angle from
+orthogonality which can be extracted experimentally from the
+spin-and-angle-resolved photoemission (S-ARPES) spectra. Our formalism is
+applicable to all strongly spin-orbit coupled systems with impurities and not
+limited to topological ones. The understanding of NOSML bears on spin-orbit
+dependent phenomena, including issues of spin-to-charge conversion and the
+interpretation of quasiparticle interference (QPI) patterns as well as
+scanning-tunneling spectra (STS) in general spin-orbit coupled materials.",2012.10647v5
+2013-07-17,Non-monotonic spin relaxation and decoherence in graphene quantum dots with spin-orbit interactions,"We investigate the spin relaxation and decoherence in a single-electron
+graphene quantum dot with Rashba and intrinsic spin-orbit interactions. We
+derive an effective spin-phonon Hamiltonian via the Schrieffer-Wolff
+transformation in order to calculate the spin relaxation time T_1 and
+decoherence time T_2 within the framework of the Bloch-Redfield theory. In this
+model, the emergence of a non-monotonic dependence of T_1 on the external
+magnetic field is attributed to the Rashba spin-orbit coupling-induced
+anticrossing of opposite spin states. A rapid decrease of T_1 occurs when the
+spin and orbital relaxation rates become comparable in the vicinity of the
+spin-mixing energy-level anticrossing. By contrast, the intrinsic spin-orbit
+interaction leads to a monotonic magnetic field dependence of the spin
+relaxation rate which is caused solely by the direct spin-phonon coupling
+mechanism. Within our model, we demonstrate that the decoherence time T_2 ~ 2
+T_1 is dominated by relaxation processes for the electron-phonon coupling
+mechanisms in graphene up to leading order in the spin-orbit interaction.
+Moreover, we show that the energy anticrossing also leads to a vanishing pure
+spin dephasing rate for these states for a super-Ohmic bath.",1307.4668v1
+2018-07-12,Spin-Phonon coupling parameters from maximally localized Wannier functions and first principles electronic structure: the case of durene single crystal,"Spin-orbit interaction is an important vehicle for spin relaxation. At finite
+temperature lattice vibrations modulate the spin-orbit interaction and thus
+generate a mechanism for spin-phonon coupling, which needs to be incorporated
+in any quantitative analysis of spin transport. Starting from a density
+functional theory \textit{ab initio} electronic structure, we calculate
+spin-phonon matrix elements over the basis of maximally localized Wannier
+functions. Such coupling terms form an effective Hamiltonian to be used to
+extract thermodynamic quantities, within a multiscale approach particularly
+suitable for organic crystals. The symmetry of the various matrix elements are
+analyzed by using the $\Gamma$-point phonon modes of a one-dimensional chain of
+Pb atoms. Then the method is employed to extract the spin-phonon coupling of
+solid durene, a high-mobility crystal organic semiconducting. Owing to the
+small masses of carbon and hydrogen spin-orbit is weak in durene and so is the
+spin-phonon coupling. Most importantly we demonstrate that the largest
+contribution to the spin-phonon interaction originates from Holstein-like
+phonons, namely from internal molecular vibrations.",1807.04579v1
+2020-11-20,Anisotropy of the spin-orbit coupling driven by a magnetic field in InAs nanowires,"We use the $\mathbf{k} \cdot \mathbf{p}$ theory and the envelope function
+approach to evaluate the Rashba spin-orbit coupling induced in a semiconductor
+nanowire by a magnetic field at different orientations, taking explicitely into
+account the prismatic symmetry of typical nano-crystals. We make the case for
+the strongly spin-orbit-coupled InAs semiconductor nanowires and investigate
+the anisotropy of the spin-orbit constant with respect to the field direction.
+At sufficiently high magnetic fields perpendicular to the nanowire, a 6-fold
+anisotropy results from the interplay between the orbital effect of field and
+the prismatic symmetry of the nanowire. A back-gate potential, breaking the
+native symmetry of the nano-crystal, couples to the magnetic field inducing a
+2-fold anisotropy, with the spin-orbit coupling being maximized or minimized
+depending on the relative orientation of the two fields. We also investigate
+in-wire field configurations, which shows a trivial 2-fold symmetry when the
+field is rotated off the axis. However, isotropic spin-orbit coupling is
+restored if a sufficiently high gate potential is applied. Our calculations are
+shown to agree with recent experimental analysis of the vectorial character of
+the spin-orbit coupling for the same nanomaterial, providing a microscopic
+interpretation of the latter.",2011.10483v1
+2000-05-30,Dynamical Properties of Spin-Orbital Chains in a Magnetic Field,"The excitation spectrum of the one-dimensional spin-orbital model in a
+magnetic field is studied, using a recently developed dynamical density matrix
+renormalization group technique. The method is employed on chains with up to 80
+sites, and examined for test cases such as the spin-1/2 antiferromagnetic
+Heisenberg chain, where the excitation spectrum is known exactly from the Bethe
+Ansatz. In the spin-orbital chain, the characteristic dynamical response
+depends strongly on the model parameters and the applied magnetic field. The
+coupling between the spin and orbital degrees of freedom is found to influence
+the incommensuration at finite magnetizations. In the regions of the phase
+diagram with only massive spin and orbital excitations, a finite field is
+required to overcome the spin gap. An incommensurate orbital mode is found to
+become massless in this partially spin-polarized regime, indicating a strong
+coupling between the two degrees of freedom. In the critical region with three
+elementary gapless excitations, a prominent particle-hole excitation is
+observed at higher energies, promoted by the biquadratic term in the model
+Hamiltonian of the spin-orbital chain.",0005526v2
+2022-07-13,"Giant orbital Hall effect and orbital-to-spin conversion in 3d, 5d, and 4f metallic heterostructures","The orbital Hall effect provides an alternative means to the spin Hall effect
+to convert a charge current into a flow of angular momentum. Recently,
+compelling signatures of orbital Hall effects have been identified in 3d
+transition metals. Here, we report a systematic study of the generation,
+transmission, and conversion of orbital currents in heterostructures comprising
+3d, 5d, and 4f metals. We show that the orbital Hall conductivity of Cr reaches
+giant values of the order of 5*10^5 Ohm^{-1} m^{-1} and that Pt presents a
+strong orbital Hall effect in addition to the spin Hall effect. Measurements
+performed as a function of thickness of nonmagnetic Cr, Mn, and Pt layers and
+ferromagnetic Co and Ni layers reveal how the orbital and spin currents compete
+or assist each other in determining the spin-orbit torques acting on the
+magnetic layer. We further show how this interplay can be drastically modulated
+by introducing 4 f spacers between the nonmagnetic and magnetic layers. Gd and
+Tb act as very efficient orbital-to-spin current converters, boosting the
+spin-orbit torques generated by Cr by a factor of 4 and reversing the sign of
+the torques generated by Pt. To interpret our results, we present a generalized
+drift-diffusion model that includes both spin and orbital Hall effects and
+describes their interconversion mediated by spin-orbit coupling.",2207.06347v1
+2012-06-28,Spin-orbit coupled transport and spin torque in a ferromagnetic heterostructure,"Ferromagnetic heterostructures provide an ideal platform to explore the
+nature of spin-orbit torques arising from the interplay mediated by itinerant
+electrons between a Rashba-type spin-orbit coupling and a ferromagnetic
+exchange interaction. For such a prototypic system, we develop a set of coupled
+diffusion equations to describe the diffusive spin dynamics and spin-orbit
+torques. We characterize the spin torque and its two prominent--out-of-plane
+and in-plane--components for a wide range of relative strength between the
+Rashba coupling and ferromagnetic exchange. The symmetry and angular dependence
+of the spin torque emerging from our simple Rashba model is in an agreement
+with experiments. The spin diffusion equation can be generalized to incorporate
+dynamic effect such as spin pumping and magnetic damping.",1206.6726v2
+2017-03-17,Spin-Degenerate Regimes for Single Quantum Dots in Transition Metal Dichalcogenide Monolayers,"Strong spin-orbit coupling in transition metal dichalcogenide (TMDC)
+monolayers results in spin resolvable band structures about the $K$ and $K'$
+valleys such that the eigenbasis of a 2D quantum dot (QD) in a TMDC monolayer
+in zero field is described by the Kramers pairs
+$|0\rangle_-=|K'\uparrow\rangle$, $|1\rangle_-=|K\downarrow\rangle$ and
+$|0\rangle_+=|K\uparrow\rangle$, $|1\rangle_+=|K'\downarrow\rangle$. The strong
+spin-orbit coupling limits the usefulness of single TMDC QDs as spin qubits.
+Possible regimes of spin-degenerate states, overcoming the spin-orbit coupling
+in monolayer TMDC QDs are investigated in both zero field, where the spin and
+valley degrees of freedom become fourfold degenerate, and twofold degeneracy in
+some magnetic field, localised to a given valley. Such regimes are shown to be
+achievable in MoS$_{2}$, where the spin orbit coupling is sufficiently low and
+of the right sign such that the spin resolved conduction bands intersect at
+points about the $K$ and $K'$ valleys and as such may be exploited by selecting
+suitable critical dot radii.",1703.05986v2
+2019-06-20,Effects of spin-orbit coupling on the neutron spin resonance in iron-based superconductors,"The so-called neutron spin resonance consists of a prominent enhancement of
+the magnetic response at a particular energy and momentum transfer upon
+entering the superconducting state of unconventional superconductors. In the
+case of iron-based superconductors, the neutron resonance has been extensively
+studied experimentally, and a peculiar spin-space anisotropy has been
+identified by polarized inelastic neutron scattering experiments. Here we
+perform a theoretical study of the energy- and spin-resolved magnetic
+susceptibility in the superconducting state with $ s_{+-} $-wave order
+parameter, relevant to iron-pnictide and iron-chalcogenide superconductors. Our
+model is based on a realistic bandstructure including spin-orbit coupling with
+electronic Hubbard-Hund interactions included at the RPA level. Spin-orbit
+coupling is taken into account both in the generation of spin-fluctuation
+mediated pairing, as well as the numerical computation of the spin
+susceptibility in the superconducting state. We find that spin-orbit coupling
+and superconductivity in conjunction can reproduce the salient experimentally
+observed features of the magnetic anisotropy of the neutron resonance. This
+includes the possibility of a double resonance, the tendency for a $c$-axis
+polarized resonance, and the existence of enhanced magnetic anisotropy upon
+entering the superconducting phase.",1906.08566v1
+2018-07-31,Spin absorption at ferromagnetic-metal/platinum-oxide interface,"We investigate the absorption of a spin current at a
+ferromagnetic-metal/Pt-oxide interface by measuring current-induced
+ferromagnetic resonance. The spin absorption was characterized by the magnetic
+damping of the heterostructure. We show that the magnetic damping of a
+Ni$_{81}$Fe$_{19}$ film is clearly enhanced by attaching Pt-oxide on the
+Ni$_{81}$Fe$_{19}$ film. The damping enhancement is disappeared by inserting an
+ultrathin Cu layer between the Ni$_{81}$Fe$_{19}$ and Pt-oxide layers. These
+results demonstrate an essential role of the direct contact between the
+Ni$_{81}$Fe$_{19}$ and Pt-oxide to induce sizable interface spin-orbit
+coupling. Furthermore, the spin-absorption parameter of the
+Ni$_{81}$Fe$_{19}$/Pt-oxide interface is comparable to that of intensively
+studied heterostructures with strong spin-orbit coupling, such as an oxide
+interface, topological insulators, metallic junctions with Rashba spin-orbit
+coupling. This result illustrates strong spin-orbit coupling at the
+ferromagnetic-metal/Pt-oxide interface, providing an important piece of
+information for quantitative understanding the spin absorption and spin-charge
+conversion at the ferromagnetic-metal/metallic-oxide interface.",1807.11806v1
+2011-12-07,Singlet-triplet splitting in double quantum dots due to spin orbit and hyperfine interactions,"We analyze the low-energy spectrum of a two-electron double quantum dot under
+a potential bias in the presence of an external magnetic field. We focus on the
+regime of spin blockade, taking into account the spin orbit interaction and
+hyperfine coupling of electron and nuclear spins. Starting from a model for two
+interacting electrons in a double dot, we derive a perturbative, effective
+two-level Hamiltonian in the vicinity of an avoided crossing between singlet
+and triplet levels, which are coupled by the spin-orbit and hyperfine
+interactions. We evaluate the level splitting at the anticrossing, and show
+that it depends on a variety of parameters including the spin orbit coupling
+strength, the orientation of the external magnetic field relative to an
+internal spin-orbit axis, the potential detuning of the dots, and the
+difference between hyperfine fields in the two dots. We provide a formula for
+the splitting in terms of the spin orbit length, the hyperfine fields in the
+two dots, and the double dot parameters such as tunnel coupling and Coulomb
+energy. This formula should prove useful for extracting spin orbit parameters
+from transport or charge sensing experiments in such systems. We identify a
+parameter regime where the spin orbit and hyperfine terms can become of
+comparable strength, and discuss how this regime might be reached.",1112.1644v1
+2017-09-28,Spin-orbit interaction of light induced by transverse spin angular momentum engineering,"We report the first demonstration of a direct interaction between the
+extraordinary transverse spin angular momentum in evanescent waves and the
+intrinsic orbital angular momentum in optical vortex beams. By tapping the
+evanescent wave of whispering gallery modes in a micro-ring-based optical
+vortex emitter and engineering the transverse spin state carried therein, a
+transverse-spin-to-orbital conversion of angular momentum is predicted in the
+emitted vortex beams. Numerical and experimental investigations are presented
+for the proof-of-principle demonstration of this unconventional interplay
+between the spin and orbital angular momenta, which could provide new
+possibilities and restrictions on the optical angular momentum manipulation
+techniques on the sub-wavelength scale. This phenomenon further gives rise to
+an enhanced spin-direction coupling effect in which waveguide or surface modes
+are unidirectional excited by incident optical vortex, with the directionality
+jointly controlled by spin-orbit states. Our results enrich the spin-orbit
+interaction phenomena by identifying a previously unknown pathway between the
+polarization and spatial degrees of freedom of light, and can enable a variety
+of functionalities employing spin and orbital angular momenta of light in
+applications such as communications and quantum information processing.",1709.09811v1
+2021-11-26,Thermal Spin-Orbit Torque in Spintronics,"Within the spinor Boltzmann equation (SBE) formalism, we derived a
+temperature dependent thermal spin-orbit torque based on local equilibrium
+assumption in a system with Rashba spin-orbit interaction. If we expand the
+distribution function of spinor Boltzmann equation around local equilibrium
+distribution, we can obtain the spin diffusion equation from SBE, then the spin
+transfer torque, spin orbit torque as well as thermal spin-orbit torque we seek
+to can be read out from this equation. It exhibits that this thermal spin-orbit
+torque originates from the temperature gradient of local equilibrium
+distribution function, which is explicit and straightforward than previous
+works. Finally, we illustrate them by an example of spin-polarized transport
+through a ferromagnet with Rashba spin-orbit coupling, in which those torques
+driven whatever by temperature gradient or bias are manifested quantitatively.",2112.01370v1
+2014-12-19,Magnetic interactions in strongly correlated systems: spin and orbital contributions,"We present a technique to map an electronic model with local interactions (a
+generalized multi-orbital Hubbard model) onto an effective model of interacting
+classical spins, by requiring that the thermodynamic potentials associated to
+spin rotations in the two systems are equivalent up to second order in the
+rotation angles. This allows to determine the parameters of relativistic and
+non-relativistic magnetic interactions in the effective spin model in terms of
+equilibrium Green's functions of the electronic model. The Hamiltonian of the
+electronic system includes, in addition to the non-relativistic part,
+relativistic single-particle terms such as the Zeeman coupling to an external
+magnetic fields, spin-orbit coupling, and arbitrary magnetic anisotropies; the
+orbital degrees of freedom of the electrons are explicitly taken into account.
+We determine the complete relativistic exchange tensors, accounting for
+anisotropic exchange, Dzyaloshinskii-Moriya interactions, as well as additional
+non-diagonal symmetric terms (which may include dipole-dipole interaction). Our
+procedure provides the complete exchange tensors in a unified framework,
+including previously disregarded features such as the vertices of two-particle
+Green's functions and non-local self-energies. We do not assume any smallness
+in spin-orbit coupling, so our treatment is in this sense exact. Finally, we
+show how to distinguish and address separately the spin, orbital and
+spin-orbital contributions to magnetism.",1412.6441v2
+2023-08-05,Optical vortex harmonic generation facilitated by photonic spin-orbit entanglement,"Photons can undergo spin-orbit coupling, by which the polarization (spin) and
+spatial profile (orbit) of the electromagnetic field interact and mix. Strong
+photonic spin-orbit coupling may reportedly arise from light propagation
+confined in a small cross-section, where the optical modes feature spin-orbit
+entanglement. However, while photonic Hamiltonians generally exhibit
+nonlinearity, the role and implication of spin-orbit entanglement in nonlinear
+optics have received little attention and are still elusive. Here, we report
+the first experimental demonstration of nonlinear optical frequency conversion,
+where spin-orbit entanglement facilitates spin-to-orbit transfer among
+different optical frequencies. By pumping a multimode optical nanofiber with a
+spin-polarized Gaussian pump beam, we produce an optical vortex at the third
+harmonic, which has long been regarded as a forbidden process in isotropic
+media. Our findings offer a unique and powerful means for efficient optical
+vortex generation that only incorporates a single Gaussian pump beam, in sharp
+contrast to any other approaches employing structured pump fields or
+sophisticatedly designed media. Our work opens up new possibilities of
+spin-orbit-coupling subwavelength waveguides, inspiring fundamental studies of
+nonlinear optics involving various types of structured light, as well as paving
+the way for the realization of hybrid quantum systems comprised of telecom
+photonic networks and long-lived quantum memories.",2308.02911v1
+2016-06-16,"Magnetic Properties from the Viewpoints of Electronic Hamiltonian: Spin Exchange Parameters, Spin Orientation and Spin-Half Misconception","In this chapter we review the quantitative and qualitative aspects of
+describing the properties of magnetic solids on the basis of electronic
+Hamiltonian. We show that a spin Hamiltonian approach becomes consistent with
+an electronic Hamiltonian approach if the spin lattice and its associated spin
+exchange parameters, to be used for the spin Hamiltonian, are determined by the
+energy-mapping analysis based on DFT calculations. The preferred spin
+orientation (i.e., the magnetic anisotropy) of a magnetic ion is not predicted
+by a spin Hamiltonian because it does not include the orbital degree of freedom
+explicitly. In contrast, the magnetic anisotropy is readily predicted by
+electronic structure theories employing both orbital and spin degrees of
+freedom, if one takes into consideration the spin-orbit coupling (SOC). It was
+shown that the preferred spin orientation of a magnetic ion can be predicted
+and understood in terms of the HOMO-LUMO interactions of the magnetic ion by
+taking SOC as perturbation. A spin Hamiltonian gives rise to the spin-half
+misconception, namely, the blind belief that spin-half magnetic ions do not
+possess magnetic anisotropy that arise from SOC. This misconception is a direct
+consequence from the limitedness of a spin Hamiltonian that it lacks the
+orbital degree of freedom. We show that the magnetic properties of 5d ion
+oxides are better explained by the LS-coupling than by the jj-coupling scheme
+of SOC, that the spin-orbital entanglement of 5d ions is not as strong as has
+been assumed.",1606.05220v1
+2009-12-17,An improved effective-one-body Hamiltonian for spinning black-hole binaries,"Building on a recent paper in which we computed the canonical Hamiltonian of
+a spinning test particle in curved spacetime, at linear order in the particle's
+spin, we work out an improved effective-one-body (EOB) Hamiltonian for spinning
+black-hole binaries. As in previous descriptions, we endow the effective
+particle not only with a mass m, but also with a spin S*. Thus, the effective
+particle interacts with the effective Kerr background (having spin S_Kerr)
+through a geodesic-type interaction and an additional spin-dependent
+interaction proportional to S*. When expanded in post-Newtonian (PN) orders,
+the EOB Hamiltonian reproduces the leading order spin-spin coupling and the
+spin-orbit coupling through 2.5PN order, for any mass-ratio. Also, it
+reproduces all spin-orbit couplings in the test-particle limit. Similarly to
+the test-particle limit case, when we restrict the EOB dynamics to spins
+aligned or antialigned with the orbital angular momentum, for which circular
+orbits exist, the EOB dynamics has several interesting features, such as the
+existence of an innermost stable circular orbit, a photon circular orbit, and a
+maximum in the orbital frequency during the plunge subsequent to the inspiral.
+These properties are crucial for reproducing the dynamics and
+gravitational-wave emission of spinning black-hole binaries, as calculated in
+numerical relativity simulations.",0912.3517v2
+2005-06-16,Design and control of spin gates in two quantum dots arrays,"We study the spin-spin interaction between quantum dots coupled through a two
+dimensional electron gas with spin-orbit interaction. We show that the
+interplay between transverse electron focusing and spin-orbit coupling allows
+to dynamically change the symmetry of the effective spin-spin Hamiltonian. That
+is, the interaction can be changed from Ising-like to Heisenberg-like and vice
+versa. The sign and magnitude of the coupling constant can also be tuned.",0506414v1
+2019-07-26,Universal relations for spin-orbit-coupled Fermi gases in two and three dimensions,"We present a comprehensive derivation of a set of universal relations for
+spin-orbit-coupled Fermi gases in three or two dimension, which follow from the
+short-range behavior of the two-body physics. Besides the adiabatic energy
+relations, the large-momentum distribution, the grand canonical potential and
+pressure relation derived in our previous work for three-dimensional systems
+{[}Phys. Rev. Lett. 120, 060408 (2018){]}, we further derive high-frequency
+tail of the radio-frequency spectroscopy and the short-range behavior of the
+pair correlation function. In addition, we also extend the derivation to
+two-dimensional systems with Rashba type of spin-orbit coupling. To simply
+demonstrate how the spin-orbit-coupling effect modifies the two-body
+short-range behavior, we solve the two-body problem in the sub-Hilbert space of
+zero center-of-mass momentum and zero total angular momentum, and
+perturbatively take the spin-orbit-coupling effect into account at short
+distance, since the strength of the spin-orbit coupling should be much smaller
+than the corresponding scale of the finite range of interatomic interactions.
+The universal asymptotic forms of the two-body wave function at short distance
+are then derived, which do not depend on the short-range details of interatomic
+potentials. We find that new scattering parameters need to be introduced
+because of spin-orbit coupling, besides the traditional $s$- and $p$-wave
+scattering length (volume) and effective ranges. This is a general and unique
+feature for spin-orbit-coupled systems. We show how these two-body parameters
+characterize the universal relations in the presence of spin-orbit coupling.
+This work probably shed light for understanding the profound properties of the
+many-body quantum systems in the presence of the spin-orbit coupling.",1907.11433v1
+2003-06-10,Correlation functions for 1d interacting fermions with spin-orbit coupling,"We compute correlation functions for one-dimensional electron systems which
+spin and charge degrees of freedom are coupled through spin-orbit coupling.
+Charge density waves, spin density waves, singlet- triplet- superconducting
+fluctuations are studied. We show that the spin-orbit interaction modify the
+exponents and the phase diagram of the system, changing the dominant
+fluctuations and making new susceptibilities diverge for low temperature.",0306251v1
+2006-07-08,Harper-Hofstadter problem for 2D electron gas with ${\bf k}$-linear Rashba spin-orbit coupling,"The Harper-Hofstadter problem for two-dimensional electron gas with Rashba
+spin-orbit coupling subject to periodic potential and perpendicular magnetic
+field is studied analytically and numerically. The butterfly-like energy
+spectrum, spinor wave functions as well as the spin density and average spin
+polarization are calculated for actual parameters of semiconductor structure.
+Our calculations show that in two-dimensional electron gas subject to periodic
+potential and uniform magnetic field the effects of energy spectrum splitting
+caused by large spin-orbit Rashba coupling can be observed experimentally.",0607216v1
+2012-11-05,Bright solitons in spin-orbit-coupled Bose-Einstein condensates,"We study bright solitons in a Bose-Einstein condensate with a spin-orbit
+coupling that has been realized experimentally. Both stationary bright solitons
+and moving bright solitons are found. The stationary bright solitons are the
+ground states and possess well-defined spin-parity, a symmetry involving both
+spatial and spin degrees of freedom; these solitons are real valued but not
+positive definite, and the number of their nodes depends on the strength of
+spin-orbit coupling. For the moving bright solitons, their shapes are found to
+change with velocity due to the lack of Galilean invariance in the system.",1211.0771v2
+2012-11-27,Short range asymptotic behavior of the wave-functions of interacting spin-half fermionic atoms with spin-orbit coupling: a model study,"We consider spin-half fermionic atoms with isotropic Rashba spin-orbit
+coupling in three directions. The interatomic potential is modeled by a square
+well potential. We derive the analytic form of the asymptotic wave-functions at
+short range of two fermions in the subspace of zero net momentum and zero total
+angular momentum. We show that the spin-orbit coupling has perturbative effects
+on the short range asymptotic behavior of the wave-functions away from
+resonances. We argue that our conclusion should hold generally.",1211.6221v2
+2014-01-15,Dark Solitons with Majorana Fermions in Spin-Orbit-Coupled Fermi Gases,"We show that a single dark soliton can exist in a spin-orbit-coupled Fermi
+gas with a high spin imbalance, where spin-orbit coupling favors uniform
+superfluids over non-uniform Fulde-Ferrell-Larkin-Ovchinnikov states, leading
+to dark soliton excitations in highly imbalanced gases. Above a critical spin
+imbalance, two topological Majorana fermions (MFs) without interactions can
+coexist inside a dark soliton, paving a way for manipulating MFs through
+controlling solitons. At the topological transition point, the atom density
+contrast across the soliton suddenly vanishes, suggesting a signature for
+identifying topological solitons.",1401.3777v2
+2015-02-19,Enhanced photogalvanic effect in graphene due to Rashba spin-orbit coupling,"We analyze theoretically optical generation of a spin-polarized charge
+current (photogalvanic effect) and spin polarization in graphene with Rashba
+spin-orbit coupling. An external magnetic field is applied in the graphene
+plane, which plays a crucial role in the mechanism of current generation. We
+predict a highly efficient resonant-like photogalvanic effect in a narrow
+frequency range which is determined by the magnetic field. A relatively less
+efficient photogalvanic effect appears in a broader frequency range, determined
+by the electron concentration and spin-orbit coupling strength.",1502.05683v1
+2014-09-24,Understanding spin Hall effect in two-dimensional fermionic systems with generic spin-orbit interaction,"We delve into spin Hall effect in generic spin-orbit coupled two-dimensional
+fermionic systems. We derive analytically the spin-orbit force responsible for
+the spin Hall effect, and find that it has `Lorentz force'-like form. We also
+derive the pseudo magnetic field responsible for this force. We establish the
+relation between the spin Hall conductivity, flux quanta and this pseudo
+magnetic field, similar to the one between charge Hall conductivity, flux
+quanta and the external field. We also present an exact closed-form expression
+of the spin Hall conductivity in a generic spin-orbit coupled system. Depending
+on the dimensionality of the spin-orbit interactions, the spin Hall
+conductivity depends on different combinations of Rashba parameter and fermion
+density.",1409.6897v2
+2024-03-19,Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque,"Spin-orbit coupling stands as a pivotal determinant in the realm of condensed
+matter physics. In recent, its profound influence on spin dynamics opens up a
+captivating arena with promising applications. Notably, the topological
+insulator-ferromagnet heterostructure has been recognized for inducing spin
+dynamics through applied current, driven by spin-orbit torque. Building upon
+recent observations revealing spin flip signals within this heterostructure,
+our study elucidates the conditions governing spin flips by studying the
+magnetization dynamics. We establish that the interplay between spin-anisotropy
+and spin-orbit torque plays a crucial role in shaping the physics of
+magnetization dynamics within the heterostructure. Furthermore, we categorize
+various modes of magnetization dynamics, constructing a comprehensive phase
+diagram across distinct energy scales, damping constants, and applied
+frequencies. This research not only offers insights into controlling spin
+direction but also charts a new pathway to the practical application of
+spin-orbit coupled systems.",2403.12701v1
+2009-02-23,Polaron formation in the presence of Rashba spin-orbit coupling: implications for spintronics,"We study the effects of the Rashba spin-orbit coupling on the polaron
+formation, using a suitable generalization of the Momentum Average
+approximation. Contrary to previous investigations of this problem, we find
+that the spin-orbit interaction decreases the effective electron-phonon
+coupling. It is thus possible to lower the effective mass of the polaron by
+increasing the spin-orbit coupling. We also show that when the spin-orbit
+coupling is large as compared to the phonon energy, the polaron retains only
+one of the spin polarized bands in its coherent spectrum. This has major
+implications for the propagation of spin-polarized currents in such materials,
+and thus for spintronic applications.",0902.3853v1
+2011-06-18,Evolution from BCS to BEC superfluidity in the presence of spin-orbit coupling,"We discuss the evolution from BCS to BEC superfluids in the presence of
+spin-orbit coupling, and show that this evolution is just a crossover in the
+balanced case. The dependence of several thermodynamic properties, such as the
+chemical potential, order parameter, pressure, entropy, isothermal
+compressibility and spin susceptibility tensor on the spin-orbit coupling and
+interaction parameter at low temperatures are analyzed. We studied both the
+case of equal Rashba and Dresselhaus (ERD) and the Rashba-only (RO) spin-orbit
+coupling. Comparisons between the two cases reveal several striking differences
+in the corresponding thermodynamic quantities. Finally we propose measuring the
+spin susceptibility as a means to detect the spin-orbit coupling effect.",1106.3613v1
+2013-12-23,Long-Range Spin-Triplet Helix in Proximity Induced Superconductivity in Spin-Orbit-Coupled Systems,"We study proximity induced triplet superconductivity in a spin-orbit-coupled
+system, and show that the \textbf{d} vector of the induced triplet
+superconductivity undergoes precession that can be controlled by varying the
+relative strengths of Rashba and Dresselhaus spin-orbit couplings. In
+particular, a long-range spin-triplet helix is predicted when these two
+spin-orbit couplings have equal strengths. We also study the Josephson junction
+geometry and show that a transition between 0 and $\pi$ junctions can be
+induced by controlling the spin-orbit coupling with a gate voltage. An
+experimental setup is proposed to verify these effects. Conversely, the
+observation of these effects can serve as a direct confirmation of triplet
+superconductivity.",1312.6458v3
+2014-09-29,Absence of a transport signature of spin-orbit coupling in graphene with indium adatoms,"Enhancement of the spin-orbit coupling in graphene may lead to various
+topological phenomena and also find applications in spintronics. Adatom
+absorption has been proposed as an effective way to achieve the goal. In
+particular, great hope has been held for indium in strengthening the spin-orbit
+coupling and realizing the quantum spin Hall effect. To search for evidence of
+the spin-orbit coupling in graphene absorbed with indium adatoms, we carry out
+extensive transport measurements, i.e., weak localization magnetoresistance,
+quantum Hall effect and non-local spin Hall effect. No signature of the
+spin-orbit coupling is found. Possible explanations are discussed.",1409.8090v1
+2016-06-14,Modulation instability in quasi two-dimensional spin-orbit coupled Bose-Einstein condensates,"We theoretically investigate the dynamics of modulation instability (MI) in
+two-dimensional spin-orbit coupled Bose-Einstein condensates (BECs). The
+analysis is performed for equal densities of pseudo-spin components. Different
+combination of the signs of intra- and inter-component interaction strengths
+are considered, with a particular emphasize on repulsive interactions. We
+observe that the unstable modulation builds from originally miscible
+condensates, depending on the combination of the signs of the intra- and
+inter-component interaction strengths. The repulsive intra- and inter-component
+interactions admit instability and the MI immiscibility condition is no longer
+significant. Influence of interaction parameters such as spin-orbit and Rabi
+coupling on MI are also investigated. The spin-orbit coupling (SOC) inevitably
+contributes to instability regardless of the nature of the interaction. In the
+case of attractive interaction, SOC manifest in enhancing the MI. Thus, a
+comprehensive study of MI in two-dimensional spin-orbit coupled binary BECs of
+pseudo-spin components is presented.",1606.04426v2
+2012-04-09,Spin-Orbit Coupled Degenerate Fermi Gases,"Spin-orbit coupling plays an increasingly important role in the modern
+condensed matter physics. For instance, it gives birth to topological
+insulators and topological superconductors. Quantum simulation of spin-orbit
+coupling using ultracold Fermi gases will offer opportunities to study these
+new phenomena in a more controllable setting. Here we report the first
+experimental study of a spin-orbit coupled Fermi gas. We observe spin dephasing
+in spin dynamics and momentum distribution asymmetry in the equilibrium state
+as hallmarks of spin-orbit coupling. We also observe evidences of Lifshitz
+transition where the topology of Fermi surfaces change. This serves as an
+important first step toward finding Majorana fermions in this system.",1204.1887v1
+2017-05-16,Theory of electron spin resonance in one-dimensional topological insulators with spin-orbit couplings,"Edge/surface states often appear in a topologically nontrivial phase, when
+the system has a boundary. The edge state of a one-dimensional topological
+insulator is one of the simplest examples. Electron Spin Resonance (ESR) is an
+ideal probe to detect and analyze the edge state for its high sensitivity and
+precision. We consider ESR of the edge state of a generalized
+Su-Schrieffer-Heeger model with a next-nearest neighbor (NNN) hopping and a
+staggered spin-orbit coupling. The spin-orbit coupling is generally expected to
+bring about nontrivial changes on the ESR spectrum. Nevertheless, in the
+absence of the NNN hoppings, we find that the ESR spectrum is unaffected by the
+spin-orbit coupling thanks to the chiral symmetry. In the presence of both the
+NNN hopping and the spin-orbit coupling, on the other hand, the edge ESR
+spectrum exhibits a nontrivial frequency shift. We derive an explicit
+analytical formula for the ESR shift in the second order perturbation theory,
+which agrees very well with a non-perturbative numerical calculation.",1705.05826v3
+2018-12-19,Global phase diagram of a spin-orbit-coupled Kondo lattice model on the honeycomb lattice,"Motivated by the growing interest in the novel quantum phases in materials
+with strong electron correlations and spin-orbit coupling, we study the
+interplay between the spin-orbit coupling, Kondo interaction, and magnetic
+frustration of a Kondo lattice model on a two-dimensional honeycomb lattice. We
+calculate the renormalized electronic structure and correlation functions at
+the saddle point based on a fermionic representation of the spin operators. We
+find a global phase diagram of the model at half-filling, which contains a
+variety of phases due to the competing interactions. In addition to a Kondo
+insulator, there is a topological insulator with valence bond solid
+correlations in the spin sector, and two antiferromagnetic phases. Due to a
+competition between the spin-orbit coupling and Kondo interaction, the
+direction of the magnetic moments in the antiferromagnetic phases can be either
+within or perpendicular to the lattice plane. The latter antiferromagnetic
+state is topologically nontrivial for moderate and strong spin-orbit couplings.",1812.07979v1
+2022-10-04,Spin-orbit enhancement in Si/SiGe heterostructures with oscillating Ge concentration,"We show that Ge concentration oscillations within the quantum well region of
+a Si/SiGe heterostructure can significantly enhance the spin-orbit coupling of
+the low-energy conduction-band valleys. Specifically, we find that for Ge
+oscillation wavelengths near $\lambda = 1.57~\text{nm}$ with an average Ge
+concentration of $\bar{n}_{\text{Ge}} = 5\%$ in the quantum well region, a
+Dresselhaus spin-orbit coupling is induced, at all physically relevant electric
+field strengths, which is over an order of magnitude larger than what is found
+in conventional Si/SiGe heterostructures without Ge concentration oscillations.
+This enhancement is caused by the Ge concentration oscillations producing
+wave-function satellite peaks a distance $2 \pi/\lambda$ away in momentum space
+from each valley, which then couple to the opposite valley through Dresselhaus
+spin-orbit coupling. Our results indicate that the enhanced spin-orbit coupling
+can enable fast spin manipulation within Si quantum dots using electric dipole
+spin resonance in the absence of micromagnets. Indeed, our calculations yield a
+Rabi frequency $\Omega_{\text{Rabi}}/B > 500~\text{MHz/T}$ near the optimal Ge
+oscillation wavelength $\lambda = 1.57~\text{nm}$.",2210.01700v2
+2006-05-18,Spin Order accompanying Loop-Current Order in Cuprates,"The theory of the long range order of orbital current loops in the pseudogap
+phase is generalized to include the effects of spin-orbit scattering. It is
+shown by symmetry arguments as well as by microscopic calculation that a
+specific in-plane spin-order must necessarily accompany the loop-current order.
+The microscopic theory also allows an estimate of the magnitude of the ordered
+spin-moment. Exchange coupling between the generated spins further modifies the
+in-plane direction of the spin moments. The structure and form factor for the
+spin and orbital moments combined with the induced spin order is consistent
+with the direction of moments deduced from polarization analysis in the neutron
+scattering experiment.",0605468v2
+2006-06-24,Magnetoconductivity in the presence of Bychkov-Rashba spin-orbit interaction,"A closed-form analytic formula for the magnetoconductivity in the diffusive
+regime is derived in the presence of Bychkov-Rashba spin-orbit interaction in
+two dimensions. It is shown that at low fields B << B_{so}, where B_{so} is the
+characteristic field associated with spin precession, D'yakonov-Perel'
+mechanism leads to spin relaxation, while for B >> B_{so} spin relaxation is
+suppressed and the resulting spin precession contributes a Berry phase-like
+spin phase to the magnetoconductivity. The relative simplicity of the formula
+greatly facilitates data fitting, allowing for the strength of the spin-orbit
+coupling to be easily extracted.",0606630v1
+2007-05-02,Charge current driven by spin dynamics in disordered Rashba spin-orbit system,"Pumping of charge current by spin dynamics in the presence of the Rashba
+spin-orbit interaction is theoretically studied. Considering disordered
+electron, the exchange coupling and spin-orbit interactions are treated
+perturbatively. It is found that dominant current induced by the spin dynamics
+is interpreted as a consequence of the conversion from spin current via the
+inverse spin Hall effect. We also found that the current has an additional
+component from a fictitious conservative field. Results are applied to the case
+of moving domain wall.",0705.0277v3
+2014-03-03,Chaos in two black holes with next-to-leading order spin-spin interactions,"We take into account the dynamics of a complete third post-Newtonian
+conservative Hamiltonian of two spinning black holes, where the orbital part
+arrives at the third post-Newtonian precision level and the spin-spin part with
+the spin-orbit part includes the leading-order and next-to-leading-order
+contributions. It is shown through numerical simulations that the
+next-to-leading order spin-spin couplings play an important role in chaos. A
+dynamical sensitivity to the variation of single parameter is also
+investigated. In particular, there are a number of \textit{observable} orbits
+whose initial radii are large enough and which become chaotic before
+coalescence.",1403.0378v1
+2014-06-18,Engineering spin-orbit coupling for photons and polaritons in microstructures,"One of the most fundamental properties of electromagnetism and special
+relativity is the coupling between the spin of an electron and its orbital
+motion. This is at the origin of the fine structure in atoms, the spin Hall
+effect in semiconductors, and underlies many intriguing properties of
+topological insulators, in particular their chiral edge states. Configurations
+where neutral particles experience an effective spin-orbit coupling have been
+recently proposed and realized using ultracold atoms and photons. Here we use
+coupled micropillars etched out of a semiconductor microcavity to engineer a
+spin-orbit Hamiltonian for photons and polaritons in a microstructure. The
+coupling between the spin and orbital momentum arises from the polarisation
+dependent confinement and tunnelling of photons between micropillars arranged
+in the form of a hexagonal photonic molecule. Dramatic consequences of the
+spin-orbit coupling are experimentally observed in these structures in the
+wavefunction of polariton condensates, whose helical shape is directly visible
+in the spatially resolved polarisation patterns of the emitted light. The
+strong optical nonlinearity of polariton systems suggests exciting perspectives
+for using quantum fluids of polaritons11 for quantum simulation of the
+interplay between interactions and spin-orbit coupling.",1406.4816v1
+2021-10-03,Giant Spin Lifetime Anisotropy and Spin-Valley Locking in Silicene and Germanene from First-Principles Density-Matrix Dynamics,"Through First-Principles real-time Density-Matrix (FPDM) dynamics
+simulations, we investigate spin relaxation due to electron-phonon and
+electron-impurity scatterings with spin-orbit coupling in two-dimensional Dirac
+materials - silicene and germanene, at finite temperatures and under external
+fields. We discussed the applicability of conventional descriptions of spin
+relaxation mechanisms by Elliott-Yafet (EY) and D'yakonov-Perel' (DP) compared
+to our FPDM method, which is determined by a complex interplay of intrinsic
+spin-orbit coupling, external fields, and electron-phonon coupling strength,
+beyond crystal symmetry. For example, the electric field dependence of spin
+relaxation time is close to DP mechanism for silicene at room temperature, but
+rather similar to EY mechanism for germanene. Due to its stronger spin-orbit
+coupling strength and buckled structure in sharp contrast to graphene,
+germanene has a giant spin lifetime anisotropy and spin valley locking effect
+under nonzero Ez and relatively low temperature. More importantly, germanene
+has extremely long spin lifetime (~100 ns at 50 K) and ultrahigh carrier
+mobility, which makes it advantageous for spin-valleytronic applications.",2110.01128v1
+2020-04-13,Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems,"Motivated by the importance of understanding competing mechanisms to
+current-induced spin-orbit torque in complex magnets, we develop a unified
+theory of current-induced spin-orbital coupled dynamics. The theory describes
+angular momentum transfer between different degrees of freedom in solids, e.g.,
+the electron orbital and spin, the crystal lattice, and the magnetic order
+parameter. Based on the continuity equations for the spin and orbital angular
+momenta, we derive equations of motion that relate spin and orbital current
+fluxes and torques describing the transfer of angular momentum between
+different degrees of freedom. We then propose a classification scheme for the
+mechanisms of the current-induced torque in magnetic bilayers. Based on our
+first-principles implementation, we apply our formalism to two different
+magnetic bilayers, Fe/W(110) and Ni/W(110), which are chosen such that the
+orbital and spin Hall effects in W have opposite sign and the resulting spin-
+and orbital-mediated torques can compete with each other. We find that while
+the spin torque arising from the spin Hall effect of W is the dominant
+mechanism of the current-induced torque in Fe/W(110), the dominant mechanism in
+Ni/W(110) is the orbital torque originating in the orbital Hall effect of W. It
+leads to negative and positive effective spin Hall angles, respectively, which
+can be directly identified in experiments. This clearly demonstrates that our
+formalism is ideal for studying the angular momentum transfer dynamics in
+spin-orbit coupled systems as it goes beyond the ""spin current picture"" by
+naturally incorporating the spin and orbital degrees of freedom on an equal
+footing. Our calculations reveal that, in addition to the spin and orbital
+torque, other contributions such as the interfacial torque and self-induced
+anomalous torque within the ferromagnet are not negligible in both material
+systems.",2004.05945v2
+2003-11-14,Spin-orbit coupling and Berry phase with ultracold atoms in 2D optical lattices,"We show how spin-orbit coupling and Berry phase can appear in two-dimensional
+optical lattices by coupling atoms' internal degrees of freedom to radiation.
+The Rashba Hamiltonian, a standard description of spin-orbit coupling for
+two-dimensional electrons, is obtained for the atoms under certain
+circumstances. We discuss the possibility of observing associated phenomena,
+such as the anomalous Hall and spin Hall effects, with cold atoms in optical
+lattices.",0311356v2
+2006-12-19,Effect of spin-orbit coupling on the excitation spectrum of Andreev billiards,"We consider the effect of spin-orbit coupling on the low energy excitation
+spectrum of an Andreev billiard (a quantum dot weakly coupled to a
+superconductor), using a dynamical numerical model (the spin Andreev map).
+Three effects of spin-orbit coupling are obtained in our simulations: In zero
+magnetic field: (1) the narrowing of the distribution of the excitation gap;
+(2) the appearance of oscillations in the average density of states. In strong
+magnetic field: (3) the appearance of a peak in the average density of states
+at zero energy. All three effects have been predicted by random-matrix theory.",0612501v1
+2014-11-25,Angular spin-orbit coupling in cold atoms,"We propose coupling two internal atomic states using a pair of Raman beams
+operated in Laguerre-Gaussian laser modes with unequal phase windings. This
+generates a coupling between the atom's pseudo-spin and its orbital angular
+momentum. We analyze the single-particle properties of the system using
+realistic parameters and provide detailed studies of the spin texture of the
+ground state. Finally, we consider a weakly interacting atomic condensate
+subject to this angular spin-orbit coupling and show how the inter-atomic
+interactions modifies the single-particle physics.",1411.6895v1
+2012-08-14,Chaos-driven dynamics in spin-orbit coupled atomic gases,"The dynamics, appearing after a quantum quench, of a trapped, spin-orbit
+coupled, dilute atomic gas is studied. The characteristics of the evolution is
+greatly influenced by the symmetries of the system, and we especially compare
+evolution for an isotropic Rashba coupling and for an anisotropic spin-orbit
+coupling. As we make the spin-orbit coupling anisotropic, we break the
+rotational symmetry and the underlying classical model becomes chaotic; the
+quantum dynamics is affected accordingly. Within experimentally relevant
+time-scales and parameters, the system thermalizes in a quantum sense. The
+corresponding equilibration time is found to agree with the Ehrenfest time,
+i.e. we numerically verify a ~log(1/h) scaling. Upon thermalization, we find
+the equilibrated distributions show examples of quantum scars distinguished by
+accumulation of atomic density for certain energies. At shorter time-scales we
+discuss non-adiabatic effects deriving from the spin-orbit coupled induced
+Dirac point. In the vicinity of the Dirac point, spin fluctuations are large
+and, even at short times, a semi-classical analysis fails.",1208.2923v2
+2017-07-08,Interaction-induced exotic vortex states in an optical lattice clock with spin-orbit coupling,"Motivated by a recent experiment [L. F. Livi, et al., Phys. Rev. Lett. 117,
+220401(2016)], we study the ground-state properties of interacting fermions in
+a one-dimensional optical lattice clock with spin-orbit coupling. As the
+electronic and the hyperfine-spin states in the clock-state manifolds can be
+treated as effective sites along distinct synthetic dimensions, the system can
+be considered as multiple two-leg ladders with uniform magnetic flux
+penetrating the plaquettes of each ladder. As the inter-orbital spin-exchange
+interactions in the clock-state manifolds couple individual ladders together,
+we show that exotic interaction-induced vortex states emerge in the
+coupled-ladder system, which compete with existing phases of decoupled ladders
+and lead to a rich phase diagram. Adopting the density matrix renormalization
+group approach, we map out the phase diagram, and investigate in detail the
+currents and the density-density correlations of the various phases. Our
+results reveal the impact of interactions on spin-orbit coupled systems, and
+are particularly relevant to the on-going exploration of spin-orbit coupled
+optical lattice clocks.",1707.02379v2
+2022-06-21,Faraday patterns in spin-orbit coupled Bose-Einstein condensates,"We study the Faraday patterns generated by spin-orbit-coupling induced
+parametric resonance in a spinor Bose-Einstein condensate with repulsive
+interaction. The collective elementary excitations of the Bose-Einstein
+condensate, including density waves and spin waves, are coupled as the result
+of the Raman-induced spin-orbit coupling and a quench of the relative phase of
+two Raman lasers without the modulation of any of the system's parameters. We
+observed several higher parametric resonance tongues at integer multiples of
+the driving frequency and investigated the interplay between Faraday
+instabilities and modulation instabilities when we quench the
+spin-orbit-coupled Bose-Einstein condensate from zero-momentum phase to
+plane-wave phase. If the detuning is equal to zero, the wave number of
+combination resonance barely changes as the strength of spin-orbit coupling
+increases. If the detuning is not equal to zero after a quench, a single
+combination resonance tongue will split into two parts.",2206.10222v1
+2019-06-30,Intrinsic Spin Hall Effect with Spin-Tensor-Momentum Coupling,"We derive the spin continuity equation by using the Noether's theorem. A new
+type of spin-tensor Hall current is found in the continuity equation. The
+spin-tensor Hall current is originating from the coupling of the spin-tensor
+and the momentum. The intrinsic spin Hall effect in the two-dimensional fermion
+model with the spin-orbit coupling and spin-tensor-momentum coupling is
+studied. The total spin Hall conductivity with the presence of the spin-tensor
+Hall current is calculated. The numerical results indicate that the total spin
+Hall conductivity is enhanced by the contribution of the spin-tensor-momentum
+coupling. The spin-tensor-momentum coupling may increase the spin transport in
+the intrinsic spin Hall effect.",1907.00319v2
+2010-12-16,Spin Relaxation in Quantum Wires,"The spin dynamics and spin relaxation of itinerant electrons in quantum wires
+with spin-orbit coupling is reviewed. We give an introduction to spin dynamics,
+and review spin-orbit coupling mechanisms in semiconductors. The spin diffusion
+equation with spin-orbit coupling is derived, using only intuitive, classical
+random walk arguments. We give an overview of all spin relaxation mechanisms,
+with particular emphasis on the motional narrowing mechanism in disordered
+conductors, the D'yakonov-Perel'-Spin relaxation. Here, we discuss in
+particular, the existence of persistent spin helix solutions of the spin
+diffusion equation, with vanishing spin relaxation rates. We then, derive
+solutions of the spin diffusion equation in quantum wires, and show that there
+is an effective alignment of the spin-orbit field in wires whose width is
+smaller than the spin precession length $L_{\rm SO}$. We show that the
+resulting reduction in the spin relaxation rate results in a change in the sign
+of the quantum corrections to the conductivity. Finally, we present recent
+experimental results which confirm the decrease of the spin relaxation rate in
+wires whose width is smaller than $L_{\rm SO}$: the direct optical measurement
+of the spin relaxation rate, as well as transport measurements, which show a
+dimensional crossover from weak antilocalization to weak localization as the
+wire width is reduced. Open problems remain, in particular in narrower,
+ballistic wires, were optical and transport measurements seem to find opposite
+behavior of the spin relaxation rate: enhancement, suppression, respectively.
+We conclude with a review of these and other open problems which still
+challenge the theoretical understanding and modeling of the experimental
+results.",1012.3575v1
+2000-12-06,Comment on ''Alternating spin and orbital dimerization and spin-gap formation in coupled spin-orbital systems'',"By this Comment we would like to point out [2] that, though such
+consideration can be quite sophisticated, the consideration of a
+spin-pseudo-spin Hamiltonian has nothing in common with the reality. It means
+that such the consideration are useless as far as the properties of real
+systems are concerned.",0012074v1
+2017-04-22,Observation of Spin Nernst effect in Platinum,"Central focus of spintronics is concentrated on generation of pure spin
+current and associated spin torque. Pure spin current can be generated by spin
+Hall effect in heavy metals by passing charge current. By spin Seebeck effect
+pure spin current can also be generated in ferromagnet. In this work we
+experimentally demonstrate that if heavy metals like Platinum with high spin
+orbit coupling carry heat current it can convert it into spin current due to
+relativistic spin orbit interaction. This conversion of heat current into spin
+current in non magnet is equivalent of thermally driven spin Hall effect or it
+is known as spin Nernst effect. We observed spin Nernst effect in Ni/Pt
+bi-layer experimentally and we confirm that when Pt is replaced by low spin
+orbit material like Al spin Nernst effect significantly reduces. So we have
+detected spin Nernst effect unambiguously and compare its strength with
+electrical spin Hall effect.",1704.06788v1
+2020-06-15,Control of Spin Relaxation Anisotropy by Spin-Orbit-Coupled Diffusive Spin Motion,"Spatiotemporal spin dynamics under spin-orbit interaction is investigated in
+a (001) GaAs two-dimensional electron gas using magneto-optical Kerr rotation
+microscopy. Spin polarized electrons are diffused away from the excited
+position, resulting in spin precession because of the diffusion-induced
+spin-orbit field. Near the cancellation between spin-orbit field and external
+magnetic field, the induced spin precession frequency depends nonlinearly on
+the diffusion velocity, which is unexpected from the conventional linear
+relation between the spin-orbit field and the electron velocity.This behavior
+originates from an enhancement of the spin relaxation anisotropy by the
+electron velocity perpendicular to the diffused direction. We demonstrate that
+the spin relaxation anisotropy, which has been regarded as a material constant,
+can be controlled via diffusive electron motion.",2006.08253v1
+2023-12-11,Dzyaloshinskii-Moriya interaction from unquenched orbital angular momentum,"Orbitronics is an emerging and fascinating field that explores the
+utilization of the orbital degree of freedom of electrons for information
+processing. An increasing number of orbital phenomena are being currently
+discovered, with spin-orbit coupling mediating the interplay between orbital
+and spin effects, thus providing a wealth of control mechanisms and device
+applications. In this context, the orbital analog of spin Dzyaloshinskii-Moriya
+interaction (DMI), i.e. orbital DMI, deserves to be explored in depth, since it
+is believed to be capable of inducing chiral orbital structures. Here, we
+unveil the main features and microscopic mechanisms of the orbital DMI in a
+two-dimensional square lattice using a tight-binding model of t2g orbitals in
+combination with the Berry phase theory. This approach allows us to investigate
+and transparently disentangle the role of inversion symmetry breaking, strength
+of orbital exchange interaction and spin-orbit coupling in shaping the
+properties of the orbital DMI. By scrutinizing the band-resolved contributions
+we are able to understand the microscopic mechanisms and guiding principles
+behind the orbital DMI and its anisotropy in two dimensional magnetic
+materials, and uncover a fundamental relation between the orbital DMI and its
+spin counterpart, which is currently explored very intensively. The insights
+gained from our work contribute to advancing our knowledge of orbitalrelated
+effects and their potential applications in spintronics, providing a path for
+future research in the field of chiral orbitronics.",2312.06054v2
+2003-06-06,Orbital mechanisms of electron spin manipulation by an electric field,"A theory of spin manipulation of quasi-two-dimensional (2D) electrons by a
+time-dependent gate voltage applied to a quantum well is developed. The
+Dresselhaus and Rashba spin-orbit coupling mechanisms are shown to be rather
+efficient for this purpose. The spin response to a perpendicular-to-plane
+electric field is due to a deviation from the strict 2D limit and is controlled
+by the ratios of the spin, cyclotron and confinement frequencies. The
+dependence of this response on the magnetic field direction is indicative of
+the strenghts of the competing spin-orbit coupling mechanisms.",0306165v1
+2019-05-29,Spin-Orbit Coupling and the Evolution of Transverse Spin,"We investigate the evolution of transverse spin in tightly focused circularly
+polarized beams of light, where spin-orbit coupling causes a local rotation of
+the polarization ellipses upon propagation through the focal volume. The effect
+can be explained as a relative Gouy-phase shift between the circularly
+polarized transverse field and the longitudinal field carrying orbital angular
+momentum. The corresponding rotation of the electric transverse spin density is
+observed experimentally by utilizing a recently developed reconstruction
+scheme, which relies on transverse-spin-dependent directional scattering of a
+nano-probe.",1905.12539v1
+2004-07-11,Non-vanishing spin Hall currents in disordered spin-orbit coupling systems,"Spin currents that flow perpendicular to the electric field direction are
+generic in metals and doped semiconductors with spin-orbit coupling. It has
+recently been argued that the spin Hall conductivity can be dominated by an
+intrinsic contribution which follows from Bloch state distortion in the
+presence of an electric field. Here we report on an numerical demonstration of
+the robustness of this effect in the presence of disorder scattering for the
+case of a two-dimensional electron-gas with Rashba spin-orbit interactions
+(R2DES).",0407279v2
+2016-03-24,Semiclassical Landau quantization of spin-orbit coupled systems,"A semiclassical quantization condition is derived for Landau levels in
+general spin-orbit coupled systems. This generalizes the Onsager quantization
+condition via a matrix-valued phase which describes spin dynamics along the
+classical cyclotron trajectory. We discuss measurement of the matrix phase via
+magnetic oscillations and electron spin resonance, which may be used to probe
+the spin structure of the precessing wavefunction. We compare the resulting
+semiclassical spectrum with exact results which are obtained for a variety of
+spin-orbit interactions in 2D systems.",1603.07450v1
+2014-03-24,Optical spin injection in graphene with Rashba spin-orbit interaction,"We calculate the efficiency of infrared optical spin injection in
+single-layer graphene with Rashba spin-orbit coupling and for in-plane magnetic
+field. The injection rate in the photon frequency range corresponding to the
+Rashba splitting is shown to be proportional to the ratio of the Zeeman and
+Rashba splittings. As a result, large spin polarization can be controllably
+achieved for experimentally available values of the spin-orbit coupling and in
+magnetic fields below 10 Tesla.",1403.6159v1
+2023-04-25,Magnetization Switching in van der Waals Systems by Spin-Orbit Torque,"Electrical switching of magnetization via spin-orbit torque (SOT) is of great
+potential in fast, dense, energy-efficient nonvolatile magnetic memory and
+logic technologies. Recently, enormous efforts have been stimulated to
+investigate switching of perpendicular magnetization in van der Waals systems
+that have unique, strong tunability and spin-orbit coupling effect compared to
+conventional metals. In this review, we first give a brief, generalized
+introduction to the spin-orbit torque and van der Waals materials. We will then
+discuss the recent advances in magnetization switching by the spin current
+generated from van der Waals materials and summary the progress in the
+switching of Van der Waals magnetization by the spin current.",2304.12632v1
+2000-05-22,Charge and Orbital Ordering and Spin State Transition Driven by Structural Distortion in YBaCo_2O_5,"We have investigated electronic structures of antiferromagnetic YBaCo_2O_5
+using the local spin-density approximation (LSDA) + U method. The charge and
+orbital ordered insulating ground state is correctly obtained with the strong
+on-site Coulomb interaction. Co^{2+} and Co^{3+} ions are found to be in the
+high spin (HS) and intermediate spin (IS) state, respectively. It is considered
+that the tetragonal to orthorhombic structural transition is responsible for
+the ordering phenomena and the spin states of Co ions. The large contribution
+of the orbital moment to the total magnetic moment indicates that the
+spin-orbit coupling is also important in YBaCo_2O_5.",0005344v1
+2009-05-09,Spin-state transition and phase separation in multi-orbital Hubbard model,"We study spin-state transition and phase separation involving this transition
+based on the milti-orbital Hubbard model. Multiple spin states are realized by
+changing the energy separation between the two orbitals and the on-site Hund
+coupling. By utilizing the variational Monte-Carlo simulation, we analyze the
+electronic and magnetic structures in hole doped and undoped states. Electronic
+phase separation occurs between the low-spin band insulating state and the
+high-spin ferromagnetic metallic one. Difference of the band widths in the two
+orbitals is of prime importance for the spin-state transition and the phase
+separation.",0905.1389v1
+2013-06-20,Induced spin filtering in electron transmission through chiral molecular layers adsorbed on metals with strong spin-orbit coupling,"Recent observations of considerable spin polarization in photoemission from
+metal surfaces through monolayers of chiral molecules were followed by several
+efforts to rationalize the results as the effect of spin-orbit interaction that
+accompanies electronic motion on helical, or more generally strongly curved,
+potential surfaces. In this paper we (a) argue, using simple models, that
+motion in curved force-fields with the typical energies used and the
+characteristic geometry of DNA cannot account for such observations; (b)
+introduce the concept of induced spin filtering, whereupon selectivity in the
+transmission of the electron orbital angular momentum can induce spin
+selectivity in the transmission process provided there is strong spin-orbit
+coupling in the substrate; and (c) show that the spin polarizability in the
+tunneling current as well as the photoemission current from gold covered by
+helical adsorbates can be of the observed order of magnitude. Our results can
+account for most of the published observations that involved gold and silver
+substrates, however recent results obtained with an aluminum substrate can be
+rationalized within the present model only if strong spin-orbit coupling is
+caused by the built-in electric field at the molecule-metal interface.",1306.4904v1
+2015-12-05,Kinetic theory of spin-polarized systems in electric and magnetic fields with spin-orbit coupling: I. Kinetic equation and anomalous Hall and spin-Hall effects,"The coupled kinetic equation for density and spin Wigner functions are
+derived including spin-orbit coupling, electric and magnetic field as well as
+selfconsistent Hartree meanfields suited for SU(2) transport. The interactions
+are assumed to be with scalar and magnetic impurities as well as scalar and
+spin-flip potentials among the particles. The spin-orbit interaction is used in
+a form suitable to solid state physics with Rashba or Dresselhaus coupling,
+graphene, extrinsic spin-orbit coupling as well as effective nuclear matter
+coupling. The deficiencies of the two-fluid model are worked out consisting in
+the appearance of an effective in-medium spin-precession. The stationary
+solution of all these systems shows a band splitting controlled by an effective
+medium-dependent Zeeman field. The selfconsistent precession direction is
+discussed and a cancellation of linear spin-orbit coupling at zero temperature
+is reported. The precession of spin around this effective direction caused by
+spin-orbit coupling leads to anomalous charge and spin currents in an electric
+field. Anomalous Hall conductivity is shown to consists of the known results
+obtained from Kubo formula or Berry phases and a new symmetric part interpreted
+as inverse Hall effect. Analogously the spin-Hall and inverse spin-Hall effect
+of spin currents are discussed which are present even without magnetic fields
+showing a spin accumulation triggered by currents. The analytical dynamical
+expressions for zero temperature are derived and discussed in dependence on the
+magnetic field and effective magnetizations. The anomalous Hall and spin-Hall
+effect changes sign at higher than a critical frequency dependent on the
+relaxation time.",1512.01660v1
+2014-08-16,Two-Dimensional TaSe2 Metallic Crystals: Spin-Orbit Scattering Length and Breakdown Current Density,"We have determined the spin-orbit scattering length of two-dimensional
+layered 2H-TaSe2 metallic crystals by detailed characterization of the weak
+anti-localization phenomena in this strong spin-orbit interaction material. By
+fitting the observed magneto-conductivity, the spin-orbit scattering length for
+2H-TaSe2 is determined to be 17 nm in the few-layer films. This small
+spin-orbit scattering length is comparable to that of Pt, which is widely used
+to study the spin Hall effect, and indicates the potential of TaSe2 for use in
+spin Hall effect devices. In addition to strong spin-orbit coupling, a material
+must also support large charge currents to achieve spin-transfer-torque via the
+spin Hall effect. Therefore, we have characterized the room temperature
+breakdown current density of TaSe2 in air, where the best breakdown current
+density reaches 3.7$\times$10$^7$ A/cm$^2$. This large breakdown current
+further indicates the potential of TaSe2 for use in spin-torque devices and
+two-dimensional device interconnect applications.",1408.3753v1
+2010-12-05,Electron spin diffusion and transport in graphene,"We investigate the spin diffusion and transport in a graphene monolayer on
+SiO$_2$ substrate by means of the microscopic kinetic spin Bloch equation
+approach. The substrate causes a strong Rashba spin-orbit coupling field $\sim
+0.15$ meV, which might be accounted for by the impurities initially present in
+the substrate or even the substrate-induced structure distortion. By surface
+chemical doping with Au atoms, this Rashba spin-orbit coupling is further
+strengthened as the adatoms can distort the graphene lattice from $sp^2$ to
+$sp^3$ bonding structure. By fitting the Au doping dependence of spin
+relaxation from Pi {\sl et al.} [Phys. Rev. Lett. {\bf 104}, 187201 (2010)],
+the Rashba spin-orbit coupling coefficient is found to increase approximately
+linearly from 0.15 to 0.23 meV with the increase of Au density. With this
+strong spin-orbit coupling, the spin diffusion or transport length is
+comparable with the experimental values. In the strong scattering limit
+(dominated by the electron-impurity scattering in our study), the spin
+diffusion is uniquely determined by the Rashba spin-orbit coupling strength and
+insensitive to the temperature, electron density as well as scattering. With
+the presence of an electric field along the spin injection direction, the spin
+transport length can be modulated by either the electric field or the electron
+density. (The remaining is omitted due to the limit of space)",1012.0973v2
+2015-04-15,Spin diffusion in ultracold spin-orbit coupled $^{40}$K gas,"We investigate the steady-state spin diffusion for ultracold spin-orbit
+coupled $^{40}$K gas by the kinetic spin Bloch equation approach both
+analytically and numerically. Four configurations, i.e., the spin diffusions
+along two specific directions with the spin polarization perpendicular
+(transverse configuration) and parallel (longitudinal configuration) to the
+effective Zeeman field are studied. It is found that the behaviors of the
+steady-state spin diffusion for the four configurations are very different,
+which are determined by three characteristic lengths: the mean free path
+$l_{\tau}$, the Zeeman oscillation length $l_{\Omega}$ and the spin-orbit
+coupling oscillation length $l_{\alpha}$. It is analytically revealed and
+numerically confirmed that by tuning the scattering strength, the system can be
+divided into {\it five} regimes: I, weak scattering regime ($l_{\tau}\gtrsim
+l_{\Omega}, l_{\alpha}$); II, Zeeman field-dominated moderate scattering regime
+($l_{\Omega}\ll l_{\tau}\ll l_{\alpha}$); III, spin-orbit coupling-dominated
+moderate scattering regime ($l_{\alpha}\ll l_{\tau}\ll l_{\Omega}$); IV,
+relatively strong scattering regime ($l_{\tau}^c\ll l_{\tau}\ll l_{\Omega},
+l_{\alpha}$); V, strong scattering regime ($l_{\tau}\ll l_{\Omega},
+l_{\alpha},l_{\tau}^c$), with $l_{\tau}^c$ representing the crossover length
+between the relatively strong and strong scattering regimes. In different
+regimes, the behaviors of the spacial evolution of the steady-state spin
+polarization are very rich, showing different dependencies on the scattering
+strength, Zeeman field and spin-orbit coupling strength. The rich behaviors of
+the spin diffusions in different regimes are hard to be understood in the
+framework of the simple drift-diffusion model or the direct inhomogeneous
+broadening picture in the literature. ...",1504.03786v1
+2017-02-10,Orbital and spin order in spin-orbit coupled $d^1$ and $d^2$ double perovskites,"We consider strongly spin-orbit coupled double perovskites A$_2$BB'O$_6$ with
+B' magnetic ions in either $d^1$ or $d^2$ electronic configuration and
+non-magnetic B ions. We provide insights into several experimental puzzles,
+such as the predominance of ferromagnetism in $d^1$ versus antiferromagnetism
+in $d^2$ systems, the appearance of negative Curie-Weiss temperatures for
+ferromagnetic materials, and the size of effective magnetic moments. We develop
+and solve a microscopic model with both spin and orbital degrees of freedom
+within the Mott insulating regime at finite temperature using mean field
+theory. The interplay between anisotropic orbital degrees of freedom and
+spin-orbit coupling results in complex ground states in both $d^1$ and $d^2$
+systems. We show that the ordering of orbital degrees of freedom in $d^1$
+systems results in coplanar canted ferromagnetic and 4-sublattice
+antiferromagnetic structures. In $d^2$ systems we find additional colinear
+antiferromagnetic and ferromagnetic phases not appearing in $d^1$ systems. At
+finite temperatures, we find that orbital ordering driven by both superexchange
+and Coulomb interactions may occur at much higher temperatures compared to
+magnetic order and leads to distinct deviations from Curie-Weiss law.",1702.03199v1
+2021-06-14,Semi-Implicit finite-difference methods to study the spin-orbit and coherently coupled spinor Bose-Einstein condensates,"We develop time-splitting finite difference methods, using implicit
+Backward-Euler and semi-implicit Crank-Nicolson discretization schemes, to
+study the spin-orbit coupled spinor Bose Einstein condensates with coherent
+coupling in quasi-one and quasi-two-dimensional traps. The split equations
+involving kinetic energy and spin-orbit coupling operators are solved using
+either time-implicit Backward-Euler or semi-implicit Crank-Nicolson methods. We
+explicitly develop the method for pseudospin-1/2, spin-1, and spin-2
+condensates. The results for ground states obtained with time-splitting
+Backward-Euler and Crank-Nicolson methods are in excellent agreement with
+time-splitting Fourier spectral method which is one of the popular methods to
+solve the mean-field models for spin-orbit coupled spinor condensates. We
+confirm the emergence of different phases in spin-orbit coupled pseudospin-1/2,
+spin-1, and spin-2 condensates with coherent coupling.",2106.07762v1
+2013-11-05,Spin accumulation detection of FMR driven spin pumping in silicon-based metal-oxide-semiconductor heterostructures,"The use of the spin Hall effect and its inverse to electrically detect and
+manipulate dynamic spin currents generated via ferromagnetic resonance (FMR)
+driven spin pumping has enabled the investigation of these dynamically injected
+currents across a wide variety of ferromagnetic materials. However, while this
+approach has proven to be an invaluable diagnostic for exploring the spin
+pumping process it requires strong spin-orbit coupling, thus substantially
+limiting the materials basis available for the detector/channel material
+(primarily Pt, W and Ta). Here, we report FMR driven spin pumping into a weak
+spin-orbit channel through the measurement of a spin accumulation voltage in a
+Si-based metal-oxide-semiconductor (MOS) heterostructure. This alternate
+experimental approach enables the investigation of dynamic spin pumping in a
+broad class of materials with weak spin-orbit coupling and long spin lifetime
+while providing additional information regarding the phase evolution of the
+injected spin ensemble via Hanle-based measurements of the effective spin
+lifetime.",1311.0965v1
+2019-10-19,Current-induced spin-orbit field in permalloy interfaced with ultrathin Ti and Cu,"How spin-orbit torques emerge from materials with weak spin-orbit coupling
+(e.g., light metals) is an open question in spintronics. Here, we report on a
+field-like spin-orbit torque (i.e., in-plane spin-orbit field transverse to the
+current axis) in SiO$_2$-sandwiched permalloy (Py), with the top Py-SiO$_2$
+interface incorporating ultrathin Ti or Cu. In both SiO$_2$/Py/Ti/SiO$_2$ and
+SiO$_2$/Py/Cu/SiO$_2$, this spin-orbit field opposes the classical Oersted
+field. While the magnitude of the spin-orbit field is at least a factor of 3
+greater than the Oersted field, we do not observe evidence for a significant
+damping-like torque in SiO$_2$/Py/Ti/SiO$_2$ or SiO$_2$/Py/Cu/SiO$_2$. Our
+findings point to contributions from a Rashba-Edelstein effect or spin-orbit
+precession at the (Ti, Cu)-inserted interface.",1910.08669v2
+2005-01-03,Rashba-control for the spin excitation of a fully spin polarized vertical quantum dot,"Far infrared radiation absorption of a quantum dot with few electrons in an
+orthogonal magnetic field could monitor the crossover to the fully spin
+polarized state. A Rashba spin-orbit coupling can tune the energy and the spin
+density of the first excited state which has a spin texture carrying one extra
+unit of angular momentum. The spin orbit coupling can squeeze a flipped spin
+density at the center of the dot and can increase the gap in the spectrum.",0501021v1
+2008-08-01,Electric-field driven long-lived spin excitations on a cylindrical surface with spin-orbit interaction,"Based on quantum-kinetic equations, coupled spin-charge drift-diffusion
+equations are derived for a two-dimensional electron gas on a cylindrical
+surface. Besides the Rashba and Dresselhaus spin-orbit interaction, the elastic
+scattering on impurities, and a constant electric field are taken into account.
+  From the solution of the drift-diffusion equations, a long-lived spin
+excitation is identified for spins coupled to the Rashba term on a cylinder
+with a given radius. The electric-field driven weakly damped spin waves are
+manifest in the components of the magnetization and have the potential for
+non-ballistic spin-device applications.",0808.0069v1
+2011-04-09,Spin Distribution in Diffraction Pattern of Two-dimensional Electron Gas with Spin-orbit Coupling,"Spin distribution in the diffraction pattern of two-dimensional electron gas
+by a split gate and a quantum point contact is computed in the presence of the
+spin-orbit coupling. After diffracted, the component of spin perpendicular to
+the two-dimensional plane can be generated up to 0.42 $\hbar$. The non-trivial
+spin distribution is the consequence of a pure spin current in the transverse
+direction generated by the diffraction. The direction of the spin current can
+be controlled by tuning the chemical potential.",1104.1684v1
+2011-08-09,Nonlinear spin Hall effect in GaAs (110) quantum wells,"We consider stationary spin current in a (110)-oriented GaAs-based symmetric
+quantum well due to a nonlinear response to an external periodic electric
+field. The model assumed includes the Dresselhaus spin-orbit interaction and
+the random Rashba spin-orbit coupling. The Dresselhaus term is uniform in the
+quantum well plane and gives rise to spin splitting of the electron band. The
+external electric field of frequency $\omega$ - in the presence of random
+Rashba coupling -- leads to virtual spin-flip transitions between spin
+subbands, generating stationary pure spin current proportional to the square of
+the field amplitude.",1108.1899v1
+2015-01-07,Superfluidity of pure spin current in ultracold Bose gases,"We study the superfluidity of a pure spin current that is a spin current
+without mass current. We examine two types of pure spin currents, planar and
+circular, in spin-1 Bose gas. For the planar current, it is usually unstable,
+but can be stabilized by the quadratic Zeeman effect. The circular current can
+be generated with spin-orbit coupling. When the spin-orbit coupling strength is
+weak, we find that the circular pure spin current is the ground state of the
+system and thus a super-flow. We discuss the experimental schemes to realize
+and detect a pure spin current.",1501.01362v1
+2012-01-23,Spin-Selective Transport of Electron in DNA Double Helix,"The experiment that the high spin selectivity and the length-dependent spin
+polarization are observed in double-stranded DNA [Science ${\bf 331}$, 894
+(2011)], is elucidated by considering the combination of the spin-orbit
+coupling, the environment-induced dephasing, and the helical symmetry. We show
+that the spin polarization in double-stranded DNA is significant even in the
+case of weak spin-orbit coupling, while no spin polarization appears in
+single-stranded DNA. Furthermore, the underlying physical mechanism and the
+parameters-dependence of the spin polarization are studied.",1201.4888v1
+2022-08-19,Spin-triplet Superconductivity in Nonsymmorphic crystals,"Spin-triplet superconductivity is known to be a rare quantum phenomenon. Here
+we show that nonsymmorphic crystalline symmetries can dramatically assist
+spin-triplet superconductivity in the presence of spin-orbit coupling. Even
+with a weak spin-orbit coupling, the spin-triplet pairing can be the leading
+pairing instability in a lattice with a nonsymmorphic symmetry. The underlining
+mechanism is the spin-sublattice-momentum lock on electronic bands that are
+protected by the nonsymmorphic symmetry. We use the nonsymmorphic space group
+P4/nmm to demonstrate these results and discuss related experimental
+observables. Our work paves a new way in searching for spin-triplet
+superconductivity.",2208.09409v1
+2022-12-22,The spin Hall effect,"In metallic systems with spin-orbit coupling a longitudinal charge current
+may generate a transverse pure spin current; vice-versa an injected pure spin
+current may result in a transverse charge current. Such direct and inverse spin
+Hall effects share the same microscopic origin: intrinsic band/device structure
+properties, external factors such as impurities, or a combination of both. They
+allow all-electrical manipulation of the electronic spin degrees of
+freedom,i.e. without magnetic elements, and their transverse nature makes them
+potentially dissipationless. It is customary to talk of spin Hall effects in
+plural form, referring to a group of related phenomena typical of spin-orbit
+coupled systems of lowered symmetry.",2212.11686v1
+2016-03-24,Interplay of Coulomb interaction and spin-orbit coupling,"We employ the Gutzwiller variational approach to investigate the interplay of
+Coulomb interaction and spin-orbit coupling in a three-orbital Hubbard model.
+Already in the paramagnetic phase we find a substantial renormalization of the
+spin-orbit coupling that enters the effective single-particle Hamiltonian for
+the quasi-particles. Only close to half band-filling and for sizable Coulomb
+interaction we observe clear signatures of Hund's atomic rules for spin,
+orbital, and total angular momentum. For a finite local Hund's-rule exchange
+interaction we find a ferromagnetically ordered state. The spin-orbit coupling
+considerably reduces the size of the ordered moment, it generates a small
+ordered orbital moment, and it induces a magnetic anisotropy. To investigate
+the magnetic anisotropy energy, we use an external magnetic field that tilts
+the magnetic moment away from the easy axis $(1,1,1)$.",1603.07544v3
+2012-01-15,Electron spin relaxation in rippled graphene with low mobilities,"We investigate spin relaxation in rippled graphene where curvature induces a
+Zeeman-like spin-orbit coupling with opposite effective magnetic fields along
+the graphene plane in ${\bf K}$ and ${\bf K}^\prime$ valleys. The joint effect
+of this Zeeman-like spin-orbit coupling and the intervalley electron-optical
+phonon scattering opens a spin relaxation channel, which manifests itself in
+low-mobility samples with the electron mean free path being smaller than the
+ripple size. Due to this spin relaxation channel, with the increase of
+temperature, the relaxation time for spins perpendicular to the effective
+magnetic field first decreases and then increases, with a minimum of several
+hundred picoseconds around room temperature. However, the spin relaxation along
+the effective magnetic field is determined by the curvature-induced Rashba-type
+spin-orbit coupling, leading to a temperature-insensitive spin relaxation time
+of the order of microseconds. Therefore, the in-plane spin relaxation in
+low-mobility rippled graphene is anisotropic. Nevertheless, in the presence of
+a small perpendicular magnetic field, as usually applied in the Hanle spin
+precession measurement, the anisotropy of spin relaxation is strongly
+suppressed.",1201.3064v1
+2003-09-18,Electron spin operation by electric fields: spin dynamics and spin injection,"Spin-orbit interaction couples electron spins to electric fields and allows
+electrical monitoring of electron spins and electrical detection of spin
+dynamics. Competing mechanisms of spin-orbit interaction are compared, and
+optimal conditions for the electric operation of electrons spins in a quantum
+well by a gate voltage are established. Electric spin injection into
+semiconductors is discussed with a special emphasis on the injection into
+ballistic microstructures. Dramatic effect of a long range Coulomb interaction
+on transport phenomena in space-quantized low-dimensional conductors is
+discussed in conclusion.",0309441v1
+2009-04-13,Semiclassical spin transport in spin-orbit-coupled systems,"This article discusses spin transport in systems with spin-orbit interactions
+and how it can be understood in a semiclassical picture. I will first present a
+semiclassical wave-packet description of spin transport, which explains how the
+microscopic motion of carriers gives rise to a spin current. Due to spin
+non-conservation the definition of the spin current has some arbitrariness. In
+the second part I will briefly review the physics from a density matrix point
+of view, which makes clear the relationship between spin transport and spin
+precession and the important role of scattering.",0904.1999v1
+2017-08-04,Quantification of spin accumulation causing spin-orbit torque in Pt/Co/Ta stack,"Spin accumulation induced by spin-orbit coupling is experimentally quantified
+in stack with in-plane magnetic anisotropy via the contribution of spin
+accumulation to Hall resistances. Using a biasing direct current the spin
+accumulation within the structure can be tuned, enabling quantification.
+Quantification shows the spin accumulation can be more than ten percentage of
+local magnetization, when the electric current is 1E11 A/m*m. The spin
+accumulation is dependent of the thickness of Ta layer, the trend agrees with
+that of spin Hall angle indicating the capability of Ta and Pt in generating
+spins.",1709.07948v1
+2011-07-14,Extending the effective-one-body Hamiltonian of black-hole binaries to include next-to-next-to-leading spin-orbit couplings,"In the effective-one-body (EOB) approach the dynamics of two compact objects
+of masses m1 and m2 and spins S1 and S2 is mapped into the dynamics of one test
+particle of mass mu = m1 m2/(m1+m2) and spin S* moving in a deformed Kerr
+metric with mass M = m1+m2 and spin Skerr. In a previous paper we computed an
+EOB Hamiltonian for spinning black-hole binaries that (i) when expanded in
+post-Newtonian orders, reproduces the leading order spin-spin coupling and the
+leading and next-to-leading order spin-orbit couplings for any mass ratio, and
+(iii) reproduces all spin-orbit couplings in the test-particle limit. Here we
+extend this EOB Hamiltonian to include next-to-next-to-leading spin-orbit
+couplings for any mass ratio. We discuss two classes of EOB Hamiltonians that
+differ by the way the spin variables are mapped between the effective and real
+descriptions. We also investigate the main features of the dynamics when the
+motion is equatorial, such as the existence of the innermost stable circular
+orbit and of a peak in the orbital frequency during the plunge subsequent to
+the inspiral.",1107.2904v2
+2014-08-10,"Strong interactions, narrow bands, and dominant spin-orbit coupling in Mott insulating quadruple perovskite CaCo3V4O12","We investigate the electronic and magnetic structures and the character and
+direction of spin and orbital moments of the recently synthesized quadruple
+perovskite cobaltovanadate CaCo3V4O12 using a selection of methods from density
+functional theory. Implementing the generalized gradient approximation and the
+Hubbard U correction (GGA+U), ferromagnetic spin alignment leads to
+half-metallicity rather than the observed narrow gap insulating behavior.
+Including spin-orbit coupling (SOC) leaves a half-semimetallic spectrum which
+is essentially Mott insulating. SOC is crucial for the Mott insulating
+character of the V d^1 ion, breaking the d_{m=\pm 1} degeneracy and also giving
+a substantial orbital moment. Evidence is obtained of the large orbital moments
+on Co that have been inferred from the measured susceptibility. Switching to
+the orbital polarization (OP) functional, GGA+OP+SOC also displays clear
+tendencies toward very large orbital moments but in its own distinctive manner.
+In both approaches, application of SOC, which requires specification of the
+direction of the spin, introduces large differences in the orbital moments of
+the three Co ions in the primitive cell. We study a fictitious but simpler
+cousin compound Ca3CoV4O12 (Ca replacing two of the Co atoms) to probe in more
+transparent fashion the interplay of spin and orbital degrees of freedom with
+the local environment of the planar CoO4 units. The observation that the
+underlying mechanisms seems to be local to a CoO4 plaquette, and that there is
+very strong coupling of the size of the orbital moment to the spin direction,
+strongly suggest non-collinear spins, not only on Co but on the V sublattice as
+well.",1408.2261v1
+2011-01-24,Identifying spin-triplet pairing in spin-orbit coupled multi-band superconductors,"We investigate the combined effect of Hund's and spin-orbit (SO) coupling on
+superconductivity in multi-orbital systems. Hund's interaction leads to
+orbital-singlet spin-triplet superconductivity, where the Cooper pair wave
+function is antisymmetric under the exchange of two orbitals. We identify three
+d-vectors describing even-parity orbital-singlet spin-triplet pairings among
+t2g-orbitals, and find that the three d-vectors are mutually orthogonal to each
+other. SO coupling further assists pair formation, pins the orientation of the
+d-vector triad, and induces spin-singlet pairings with a relative phase
+difference of \pi/2. In the band basis the pseudospin d-vectors are aligned
+along the z-axis and correspond to momentum-dependent inter- and intra-band
+pairings. We discuss quasiparticle dispersion, magnetic response, collective
+modes, and experimental consequences in light of the superconductor Sr2RuO4.",1101.4656v3
+2024-01-22,Finite-momentum and field-induced pairings in orbital-singlet spin-triplet superconductors,"Finite-momentum pairing in a Pauli-limited spin-singlet superconductor arises
+from the pair-breaking effects of an external Zeeman field, a mechanism which
+is not applicable in odd-parity spin-triplet superconductors. However, in
+multiorbital systems, the relevant bands originating from different orbitals
+are usually separated in momentum space, implying that orbital-singlet pairing
+is a natural candidate for a finite-momentum pairing state. We show that
+finite-momentum pairing arises in even-parity orbital-singlet spin-triplet
+superconductors via the combination of orbitally-nontrivial kinetic terms and
+Hund's coupling. The finite-momentum pairing is then suppressed with an
+increasing spin-orbit coupling, stabilizing a uniform pseudospin-singlet
+pairing. We also examine the effects of the magnetic field and find
+field-induced superconductivity at large fields. We apply these findings to the
+multiorbital superconductor with spin-orbit coupling, Sr$_{2}$RuO$_{4}$ and
+show that a finite-momentum pseudospin-singlet state appears between the
+uniform pairing and normal states. Future directions of inquiry relating to our
+findings are also discussed.",2401.12320v1
+2008-05-07,Frustration and entanglement in the $t_{2g}$ spin--orbital model on a triangular lattice: valence--bond and generalized liquid states,"We consider the spin--orbital model for a magnetic system with singly
+occupied but triply degenerate $t_{2g}$ orbitals coupled into a planar,
+triangular lattice, as would be exemplified by NaTiO$_2$. We investigate the
+ground states of the model for interactions which interpolate between the
+limits of pure superexchange and purely direct exchange interactions. By
+considering ordered and dimerized states at the mean--field level, and by
+interpreting the results from exact diagonalization calculations on selected
+finite systems, we demonstrate that orbital interactions are always frustrated,
+and that orbital correlations are dictated by the spin state, manifesting an
+intrinsic entanglement of these degrees of freedom. In the absence of Hund
+coupling, the ground state changes from a highly resonating, dimer--based,
+symmetry--restored spin and orbital liquid phase, to one based on completely
+static, spin--singlet valence bonds. The generic properties of frustration and
+entanglement survive even when spins and orbitals are nominally decoupled in
+the ferromagnetic phases stabilized by a strong Hund coupling. By considering
+the same model on other lattices, we discuss the extent to which frustration is
+attributable separately to geometry and to interaction effects.",0805.1028v1
+2021-03-08,Spin-orbital model for fullerides,"The multiorbital Hubbard model in the strong coupling limit is analyzed for
+the effectively antiferromagnetic Hund's coupling relevant to fulleride
+superconductors with three orbitals per molecule. The localized spin-orbital
+model describes the thermodynamics of the half-filled (three-electron) state
+with total spin-1/2, composed of singlon and doublon placed on the two of three
+orbitals. The model is solved using the mean-field approximation and magnetic
+and electric ordered states are clarified through the temperature dependences
+of the order parameters. Combining the model with the band structure from {\it
+ab initio} calculation, we also semi-quantitavely analyze the realistic model
+and the corresponding physical quantities. In the A15-structure fulleride
+model, there is an antiferromagnetic ordered state, and subsequently the two
+orbital ordered state appears at lower temperatures. It is argued that the
+origin of these orbital orders is related to the $T_h$ point group symmetry. As
+for the fcc-fulleride model, the time-reversal broken orbital ordered state is
+identified. Whereas the spin degeneracy remains in our treatment for the
+geometrically frustrated lattice, it is expected to be lifted by some magnetic
+ordering or quantum fluctuations, but not by the spin-orbital coupling which is
+effectively zero for fullerides in the strong-coupling regime.",2103.04960v1
+2022-11-11,Orbital Origin of Intrinsic Planar Hall Effect,"Recent experiments reported an antisymmetric planar Hall effect, where the
+Hall current is odd in the in-plane magnetic field and scales linearly with
+both electric and magnetic fields applied. Existing theories rely exclusively
+on a spin origin, which requires spin-orbit coupling to take effect. Here, we
+develop a general theory for the intrinsic planar Hall effect (IPHE),
+highlighting a previously unknown orbital mechanism and connecting it to a band
+geometric quantity -- the anomalous orbital polarizability (AOP). Importantly,
+the orbital mechanism does not request spin-orbit coupling, so sizable IPHE can
+occur and is dominated by orbital contribution in systems with weak spin-orbit
+coupling. Combined with first-principles calculations, we demonstrate our
+theory with quantitative evaluation for bulk materials $\mathrm{TaSb_{2}}$,
+$\mathrm{NbAs_{2}}$, and $\mathrm{SrAs_{3}}$. We further show that AOP and its
+associated orbital IPHE can be greatly enhanced at topological band crossings,
+offering a new way to probe topological materials.",2211.05978v2
+2024-01-16,Active Control of Ballistic Orbital Transport,"Orbital current, defined as the orbital character of Bloch states in solids,
+can ballistically travel with larger coherence length through a broader range
+of materials than its spin counterpart, facilitating a robust, higher density
+and energy efficient information transmission. Hence, active control of orbital
+transport plays a pivotal role in propelling the progress of the evolving field
+of quantum information technology. Unlike spin angular momentum, orbital
+angular momentum (OAM), couples to phonon angular momentum (PAM) efficiently
+via orbital-crystal momentum (L-k) coupling, giving us the opportunity to
+control orbital transport through crystal field potential mediated angular
+momentum transfer. Here, leveraging the orbital dependant efficient L-k
+coupling, we have experimentally demonstrated the active control of orbital
+current velocity using THz emission spectroscopy. Our findings include the
+identification of a critical energy density required to overcome collisions in
+orbital transport, enabling a swifter flow of orbital current. The capability
+to actively control the ballistic orbital transport lays the groundwork for the
+development of ultrafast devices capable of efficiently transmitting
+information over extended distance.",2401.08373v1
+2024-04-06,Consistent Second-Order Treatment of Spin-Orbit Coupling and Dynamic Correlation in Quasidegenerate N-Electron Valence Perturbation Theory,"We present a formulation and implementation of second-order quasidegenerate
+N-electron valence perturbation theory (QDNEVPT2) that provides a balanced and
+accurate description of spin-orbit coupling and dynamic correlation effects in
+multiconfigurational electronic states. In our approach, the energies and
+wavefunctions of electronic states are computed by treating electron repulsion
+and spin-orbit coupling operators as equal perturbations to the
+non-relativistic complete active-space wavefunctions and their contributions
+are incorporated fully up to the second order. The spin-orbit effects are
+described using the Breit-Pauli (BP) or exact two-component Douglas-Kroll-Hess
+(DKH) Hamiltonians within spin-orbit mean-field approximation. The resulting
+second-order methods (BP2- and DKH2-QDNEVPT2) are capable of treating
+spin-orbit coupling effects in nearly degenerate electronic states by
+diagonalizing an effective Hamiltonian expanded in a compact non-relativistic
+basis. For a variety of atoms and small molecules across the entire periodic
+table, we demonstrate that DKH2-QDNEVPT2 is competitive in accuracy with
+variational two-component relativistic theories. BP2-QDNEVPT2 shows high
+accuracy for the second- and third-period elements, but its performance
+deteriorates for heavier atoms and molecules. We also consider the first-order
+spin-orbit QDNEVPT2 approximations (BP1- and DKH1-QDNEVPT2), among which
+DKH1-QDNEVPT2 is reliable but less accurate than DKH2-QDNEVPT2. Both DKH1- and
+DKH2-QDNEVPT2 hold promise as efficient and accurate electronic structure
+methods for treating electron correlation and spin-orbit coupling in a variety
+of applications.",2404.04716v1
+2012-08-29,Radio-frequency spectroscopy of weakly bound molecules in spin-orbit coupled atomic Fermi gases,"We investigate theoretically radio-frequency spectroscopy of weakly bound
+molecules in an ultracold spin-orbit-coupled atomic Fermi gas. We consider two
+cases with either equal Rashba and Dresselhaus coupling or pure Rashba
+coupling. The former system has been realized very recently at Shanxi
+University [Wang et al., arXiv:1204.1887] and MIT [Cheuk et al.,
+arXiv:1205.3483]. We predict realistic radio-frequency signals for revealing
+the unique properties of anisotropic molecules formed by spin-orbit coupling.",1208.5841v1
+2018-04-30,Superconducting tunneling spectroscopy of spin-orbit coupling and orbital depairing in Nb:SrTiO$_3$,"We have examined the intrinsic spin-orbit coupling (SOC) and orbital
+depairing in thin films of Nb-doped SrTiO$_3$ by superconducting tunneling
+spectroscopy. The orbital depairing is geometrically suppressed in the
+two-dimensional limit, enabling a quantitative evaluation of the Fermi level
+spin-orbit scattering using Maki's theory. The response of the superconducting
+gap under in-plane magnetic fields demonstrates short spin-orbit scattering
+times $\tau_{so} \leq 1.1$ ps. Analysis of the orbital depairing indicates that
+the heavy electron band contributes significantly to pairing. These results
+suggest that the intrinsic spin-orbit scattering time in SrTiO$_3$ is
+comparable to those associated with Rashba effects in SrTiO$_3$ interfacial
+conducting layers and can be considered significant in all forms of
+superconductivity in SrTiO$_3$.",1805.00047v1
+2020-03-30,Intrinsic orbital moment and prediction of a large orbital Hall effect in the 2D transition metal dichalcogenides,"Carrying information using generation and detection of the orbital current,
+instead of the spin current, is an emerging field of research, where the
+orbital Hall effect (OHE) is an important ingredient. Here, we propose a new
+mechanism of the OHE that occurs in {\it non-}centrosymmetric materials. We
+show that the broken inversion symmetry in the 2D transition metal
+dichalcogenides (TMDCs) causes a robust orbital moment, which flow in different
+directions due to the opposite Berry curvatures under an applied electric
+field, leading to a large OHE. This is in complete contrast to the
+inversion-symmetric systems, where the orbital moment is induced only by the
+external electric field. We show that the valley-orbital locking as well as the
+OHE both appear even in the absence of the spin-orbit coupling. The non-zero
+spin-orbit coupling leads to the well-known valley-spin locking and the spin
+Hall effect, which we find to be weak, making the TMDCs particularly suitable
+for direct observation of the OHE, with potential application in {\it
+orbitronics}.",2003.13181v1
+2017-05-26,Role of the spin-orbit coupling in the Kugel-Khomskii model on the honeycomb lattice,"We study the effective spin-orbital model for honeycomb-layered transition
+metal compounds, applying the second-order perturbation theory to the
+three-orbital Hubbard model with the anisotropic hoppings. This model is
+reduced to the Kitaev model in the strong spin-orbit coupling limit. Combining
+the cluster mean-field approximations with the exact diagonalization, we treat
+the Kugel-Khomskii type superexchange interaction and spin-orbit coupling on an
+equal footing to discuss ground-state properties. We find that a zigzag ordered
+state is realized in the model within nearest-neighbor interactions. We clarify
+how the ordered state competes with the nonmagnetic state, which is
+adiabatically connected to the quantum spin liquid state realized in a strong
+spin-orbit coupling limit. Thermodynamic properties are also addressed. The
+present work should provide another route to account for the Kitaev-based
+magnetic properties in candidate materials.",1705.09659v1
+2019-08-21,Spin-orbit-coupled quantum memory of a double quantum dot,"The concept of quantum memory plays an incisive role in the quantum
+information theory. As confirmed by several recent rigorous mathematical
+studies, the quantum memory inmate in the bipartite system $\rho_{AB}$ can
+reduce uncertainty about the part $B$, after measurements done on the part $A$.
+In the present work, we extend this concept to the systems with a spin-orbit
+coupling and introduce a notion of spin-orbit quantum memory. We
+self-consistently explore Uhlmann fidelity, pre and post measurement
+entanglement entropy and post measurement conditional quantum entropy of the
+system with spin-orbit coupling and show that measurement performed on the spin
+subsystem decreases the uncertainty of the orbital part. The uncovered effect
+enhances with the strength of the spin-orbit coupling. We explored the concept
+of macroscopic realism introduced by Leggett and Garg and observed that POVM
+measurements done on the system under the particular protocol are
+non-noninvasive. For the extended system, we performed the quantum Monte Carlo
+calculations and explored reshuffling of the electron densities due to the
+external electric field.",1908.07766v2
+2019-07-01,Spin dynamics of moving bodies in rotating black hole spacetimes,"The dynamics of spinning test bodies, moving in rotating black hole (Kerr,
+Bardeen-like and Hayward-like) spacetimes, are investigated. In Kerr spacetime,
+all the spherical, zoom-whirl and unbound orbits are considered numerically.
+Along spherical orbits and for high spin, an amplitude modulation is found in
+the harmonic evolution of the spin precessional angular velocity, caused by the
+spin-curvature coupling. Along the discussed zoom-whirl and unbound orbits, the
+test body approaches the center so much that it passes through the ergosphere.
+Near and inside the ergosphere, the variation of the spin direction can be very
+rapid. The effects of the spin-curvature coupling is also investigated. The
+initial values are chosen such a way, that the body and its spin move in the
+equatorial plane of the coordinate space and of the comoving frame,
+respectively. Hence, a clear effect of the spin-curvature coupling is observed
+as the orbit and the spin vector leave the equatorial plane. Additional effects
+in the spin precessional angular velocity and in the evolution of the
+Boyer-Lindquist coordinate components of the spin vector is also considered.
+Finally, in case of different regular black holes, the spin-curvature coupling
+influences differently the orbit and the spin evolutions.",1907.00974v2
+2016-12-11,The Spinon Fermi Surface U(1) Spin Liquid in a Spin-Orbit-Coupled Triangular Lattice Mott Insulator YbMgGaO4,"Motivated by the recent progress on the spin-orbit-coupled triangular lattice
+spin liquid candidate YbMgGaO4, we carry out a systematic projective symmetry
+group analysis and mean-field study of candidate U(1) spin liquid ground
+states. Due to the spin-orbital entanglement of the Yb moments, the space group
+symmetry operation transforms both the position and the orientation of the
+local moments, and hence brings different features for the projective
+realization of the lattice symmetries from the cases with spin-only moments.
+Among the eight U(1) spin liquids that we find with the fermionic parton
+construction, only one spin liquid state, that was proposed and analyzed in Yao
+Shen, et al, Nature 540, 559-562 (2016) and labeled as U1A00 in the present
+work, stands out and gives a large spinon Fermi surface and provides a
+consistent explanation for the spectroscopic results in YbMgGaO4. Further
+connection of this spinon Fermi surface U(1) spin liquid with YbMgGaO4 and the
+future directions are discussed. Finally, our results may apply to other
+spin-orbit-coupled triangular lattice spin liquid candidates, and more broadly,
+our general approach can be well extended to spin-orbit-coupled spin liquid
+candidate materials.",1612.03447v4
+2011-08-08,"Spin-Orbital Locking, Emergent Pseudo-Spin, and Magnetic order in Honeycomb Lattice Iridates","The nature of the effective spin Hamiltonian and magnetic order in the
+honeycomb iridates is explored by considering a trigonal crystal field effect
+and spin-orbit coupling. Starting from a Hubbard model, an effective spin
+Hamiltonian is derived in terms of an emergent pseudo-spin-1/2 moment in the
+limit of large trigonal distortions and spin-orbit coupling. The present
+pseudo-spins arise from a spin-orbital locking and are different from the jeff
+= 1/2 moments that are obtained when the spin-orbit coupling dominates and
+trigonal distortions are neglected. The resulting spin Hamiltonian is
+anisotropic and frustrated by further neighbour interactions. Mean field theory
+suggests a ground state with 4-sublattice zig-zag magnetic order in a parameter
+regime that can be relevant to the honeycomb iridate compound Na2IrO3, where
+similar magnetic ground state has recently been observed. Various properties of
+the phase, the spin-wave spectrum and experimental consequences are discussed.
+The present approach contrasts with the recent proposals to understand iridate
+compounds starting from the strong spin-orbit coupling limit and neglecting
+non-cubic lattice distortions.",1108.1806v3
+2005-02-03,Spin resolved Hall effect driven by spin-orbit coupling,"Spin and electric Hall currents are calculated numerically in a
+two-dimensional mesoscopic system with Rashba and Dresselhaus spin-orbit
+coupling by means of the Landauer-Buttiker formalism. It is found that both
+electric and spin Hall currents circulate when two spin-orbit couplings
+coexist, while the electric Hall conductance vanishes if either one is absent.
+The electric and spin Hall conductances are suppressed in strong disorder, but
+survive in weak disorder. Physically it can be understood that the spinomotive
+transverse ""force"" generated by spin-orbit coupling is responsible for the
+formation of the spin Hall current and the lack of transverse reflection
+symmetry is the origin of the electric Hall current.",0502102v2
+2012-05-28,Dzyaloshinskii-Moriya Interaction and Spiral Order in Spin-orbit Coupled Optical Lattices,"We show that the recent experimental realization of spin-orbit coupling in
+ultracold atomic gases can be used to study different types of spin spiral
+order and resulting multiferroic effects. Spin-orbit coupling in optical
+lattices can give rise to the Dzyaloshinskii-Moriya (DM) spin interaction which
+is essential for spin spiral order. By taking into account spin-orbit coupling
+and an external Zeeman field, we derive an effective spin model in the Mott
+insulator regime at half filling and demonstrate that the DM interaction in
+optical lattices can be made extremely strong with realistic experimental
+parameters. The rich finite temperature phase diagrams of the effective spin
+models for fermions and bosons are obtained via classical Monte Carlo
+simulations.",1205.6211v2
+2021-12-09,Impact of Kondo correlations and spin-orbit coupling on spin-polarized transport in carbon nanotube quantum dot,"Spin polarized transport through a quantum dot coupled to ferromagnetic
+electrodes with noncollinear magnetizations is discussed in terms of
+nonequilibrium Green functions formalism in the finite-U slave boson mean field
+approximation. The difference of orientations of the magnetizations of
+electrodes opens off-diagonal spin-orbital transmission and apart from spin
+currents of longitudinal polarization also spin-flip currents appear. We also
+study equilibrium pure spin current at zero bias and discuss its dependence on
+magnetization orientation, spin-orbit coupling strength and gate voltage.
+Impact of these factors on tunneling magnetoresistance (TMR) is also
+undertaken. In general spin-orbit coupling weakens TMR, but it can change its
+sign.",2112.04765v1
+2016-04-15,Determining the spin-orbit coupling via spin-polarized spectroscopy of magnetic impurities,"We study the spin-resolved spectral properties of the impurity states
+associated to the presence of magnetic impurities in two-dimensional, as well
+as one-dimensional systems with Rashba spin-orbit coupling. We focus on Shiba
+bound states in superconducting materials, as well as on impurity states in
+metallic systems. Using a combination of a numerical T-matrix approximation and
+a direct analytical calculation of the bound state wave function, we compute
+the local density of states (LDOS) together with its Fourier transform (FT). We
+find that the FT of the spin-polarized LDOS, a quantity accessible via
+spin-polarized STM, allows to accurately extract the strength of the spin-orbit
+coupling. Also we confirm that the presence of magnetic impurities is strictly
+necessary for such measurement, and that non-spin-polarized experiments cannot
+have access to the value of the spin-orbit coupling.",1604.04623v3
+2018-09-28,Engineering long spin coherence times of spin-orbit systems,"Spin-orbit coupling fundamentally alters spin qubits, opening pathways to
+improve the scalability of quantum computers via long distance coupling
+mediated by electric fields, photons, or phonons. It also allows for new
+engineered hybrid and topological quantum systems. However, spin qubits with
+intrinsic spin-orbit coupling are not yet viable for quantum technologies due
+to their short ($\sim1~\mu$s) coherence times $T_2$, while qubits with long
+$T_2$ have weak spin-orbit coupling making qubit coupling short-ranged and
+challenging for scale-up. Here we show that an intrinsic spin-orbit coupled
+""generalised spin"" with total angular momentum $J=\tfrac{3}{2}$, which is
+defined by holes bound to boron dopant atoms in strained $^{28}\mathrm{Si}$,
+has $T_2$ rivalling the electron spins of donors and quantum dots in
+$^{28}\mathrm{Si}$. Using pulsed electron paramagnetic resonance, we obtain
+$0.9~\mathrm{ms}$ Hahn-echo and $9~\mathrm{ms}$ dynamical decoupling $T_2$
+times, where strain plays a key role to reduce spin-lattice relaxation and the
+longitudinal electric coupling responsible for decoherence induced by electric
+field noise. Our analysis shows that transverse electric dipole can be
+exploited for electric manipulation and qubit coupling while maintaining a weak
+longitudinal coupling, a feature of $J=\tfrac{3}{2}$ atomic systems with a
+strain engineered quadrupole degree of freedom. These results establish
+single-atom hole spins in silicon with quantised total angular momentum, not
+spin, as a highly coherent platform with tuneable intrinsic spin-orbit coupling
+advantageous to build artificial quantum systems and couple qubits over long
+distances.",1809.10859v2
+2013-06-03,The role of the Rashba coupling in spin current of monolayer gapped graphene,"In the current work we have investigated the influence of the Rashba
+spin-orbit coupling on spin-current of a single layer gapped graphene. It was
+shown that the Rashba coupling has a considerable role in generation of the
+spin-current of vertical spins in mono-layer graphene. The behavior of the
+spin-current is determined by density of impurities. It was also shown that the
+spin-current of the system could increase by increasing the Rashba coupling
+strength and band-gap of the graphene and the sign of the spin-current could be
+controlled by the direction of the current-driving electric field.",1306.0611v1
+2016-11-25,Spin-orbit Hamiltonian for organic crystals from first principles electronic structure and Wannier functions,"Spin-orbit coupling in organic crystals is responsible for many
+spin-relaxation phenomena, going from spin diffusion to intersystem crossing.
+With the goal of constructing effective spin-orbit Hamiltonians to be used in
+multiscale approaches to the thermodynamical properties of organic crystals, we
+present a method that combines density functional theory with the construction
+of Wannier functions. In particular we show that the spin-orbit Hamiltonian
+constructed over maximally localised Wannier functions can be computed by
+direct evaluation of the spin-orbit matrix elements over the Wannier functions
+constructed in absence of spin-orbit interaction. This eliminates the prob- lem
+of computing the Wannier functions for almost degenerate bands, a problem
+always present with the spin-orbit-split bands of organic crystals. Examples of
+the method are presented for isolated molecules, for mono-dimensional chains of
+Pb and C atoms and for triarylamine-based one-dimansional single crystals.",1611.08424v2
+2008-01-07,Spin-orbit and tensor mean-field effects on spin-orbit splitting including self-consistent core polarizations,"A new strategy of fitting the coupling constants of the nuclear energy
+density functional is proposed, which shifts attention from ground-state bulk
+to single-particle properties. The latter are analyzed in terms of the bare
+single-particle energies and mass, shape, and spin core-polarization effects.
+Fit of the isoscalar spin-orbit and both isoscalar and isovector tensor
+coupling constants directly to the f5/2-f7/2 spin-orbit splittings in 40Ca,
+56Ni, and 48Ca is proposed as a practical realization of this new programme. It
+is shown that this fit requires drastic changes in the isoscalar spin-orbit
+strength and the tensor coupling constants as compared to the commonly accepted
+values but it considerably and systematically improves basic single-particle
+properties including spin-orbit splittings and magic-gap energies. Impact of
+these changes on nuclear binding energies is also discussed.",0801.0924v1
+2014-08-18,"Charge noise, spin-orbit coupling, and coherence of single-spin qubits","Spin-orbit coupling is ubiquitous in quantum dot quantum computing
+architectures, and makes spin qubits susceptible to charge noise. We derive a
+Hamiltonian describing the effect of spin-orbit and noise on a single-spin
+qubit in a quantum dot. Relaxation is due to noise coupling different orbital
+levels and is dominated by screened whole charge defects near the dot.
+Dephasing stems from noise causing relative fluctuations between orbital
+levels, and is driven by screened whole charge defects and unscreened dipole
+defects in the substrate. Dephasing times are vastly different between common
+materials such as Si and GaAs. They can be enhanced by increasing gate fields,
+choosing materials with weak spin-orbit such as Si, making dots narrower, or
+using accumulation dots.",1408.4123v2
+2021-02-04,Spin-orbit-entangled electronic phases in 4$d$ and 5$d$ transition-metal compounds,"Complex oxides with $4d$ and $5d$ transition-metal ions recently emerged as a
+new paradigm in correlated electron physics, due to the interplay between
+spin-orbit coupling and electron interactions. For $4d$ and $5d$ ions, the
+spin-orbit coupling, $\zeta$, can be as large as 0.2-0.4 eV, which is
+comparable with and often exceeds other relevant parameters such as Hund's
+coupling $J_{\rm H}$, noncubic crystal field splitting $\Delta$, and the
+electron hopping amplitude $t$. This gives rise to a variety of
+spin-orbit-entangled degrees of freedom and, crucially, non-trivial
+interactions between them that depend on the $d$-electron configuration, the
+chemical bonding, and the lattice geometry. Exotic electronic phases often
+emerge, including spin-orbit assisted Mott insulators, quantum spin liquids,
+excitonic magnetism, multipolar orderings and correlated topological
+semimetals. This paper provides a selective overview of some of the most
+interesting spin-orbit-entangled phases that arise in $4d$ and $5d$
+transition-metal compounds.",2102.02740v1
+2008-08-18,Dilution effect in correlated electron system with orbital degeneracy,"Theory of dilution effect in orbital ordered system is presented. The $e_g$
+orbital model without spin degree of freedom and the spin-orbital coupled model
+in a three-dimensional simple-cubic lattice are analyzed by the Monte-Carlo
+simulation and the cluster expansion method. In the $e_g$ orbital model without
+spin degree of freedom, reduction of the orbital ordering temperature due to
+dilution is steeper than that in the dilute magnet. This is attributed to a
+modification of the orbital wave-function around vacant sites. In the
+spin-orbital coupled model, it is found that magnetic structure is changed from
+the A-type antiferromagnetic order into the ferromagnetic one. Orbital
+dependent exchange interaction and a sign change of this interaction around
+vacant sites bring about this novel phenomena. Present results explain the
+recent experiments in transition-metal compounds with orbital dilution.",0808.2372v1
+2019-08-06,Spectral properties of spin-orbital polarons as a fingerprint of orbital order,"Transition metal oxides are a rich group of materials with very interesting
+physical properties that arise from the interplay of the charge, spin, orbital,
+and lattice degrees of freedom. One interesting consequence of this,
+encountered in systems with orbital degeneracy, is the coexistence of long
+range magnetic and orbital order, and the coupling between them. In this paper
+we develop and study an effective spin-orbital superexchange model for $e_g^3$
+systems and use it to investigate the spectral properties of a charge (hole)
+injected into the system, which is relevant for photoemission spectroscopy.
+Using an accurate, semi-analytical, magnon expansion method, we gain insight
+into various physical aspects of these systems and demonstrate a number of
+subtle effects, such as orbital to magnetic polaron crossover, the coupling
+between orbital and magnetic order, as well as the orbital order driving the
+system towards one-dimensional quantum spin liquid behavior. Our calculations
+also suggest a potentially simple experimental verification of the character of
+the orbital order in the system, something that is not easily accessible
+through most experimental techniques.",1908.02232v1
+2017-03-24,Gate control of the spin mobility through the modification of the spin-orbit interaction in two-dimensional systems,"Spin drag measurements were performed in a two-dimensional electron system
+set close to the crossed spin helix regime and coupled by strong intersubband
+scattering. In a sample with uncommon combination of long spin lifetime and
+high charge mobility, the drift transport allows us to determine the spin-orbit
+field and the spin mobility anisotropies. We used a random walk model to
+describe the system dynamics and found excellent agreement for the Rashba and
+Dresselhaus couplings. The proposed two-subband system displays a large tuning
+lever arm for the Rashba constant with gate voltage, which provides a new path
+towards a spin transistor. Furthermore, the data shows large spin mobility
+controlled by the spin-orbit constants setting the field along the direction
+perpendicular to the drift velocity. This work directly reveals the resistance
+experienced in the transport of a spin-polarized packet as a function of the
+strength of anisotropic spin-orbit fields.",1703.08405v2
+2006-01-27,Spin-orbit effects on the Larmor dispersion relation in GaAs quantum wells,"We have studied the relevance of spin-orbit coupling to the dispersion 00009
+relation of the Larmor resonance observed in inelastic light scattering and
+electron-spin resonance experiments on GaAs quantum wells. We show that the
+spin-orbit interaction, here described by a sum of Dresselhaus and
+Bychkov-Rashba terms, couples Zeeman and spin-density excitations. We have
+evaluated its contribution to the spin splitting as a function of the magnetic
+field $B$, and have found that in the small $B$ limit, the spin-orbit
+interaction does not contribute to the spin splitting, whereas at high magnetic
+fields it yields a $B$ independent contribution to the spin splitting given by
+$2(\lambda_R^2-\lambda_D^2)$, with $\lambda_{R,D}$ being the intensity of the
+Bychkov-Rashba and Dresselhaus spin-orbit terms.",0601635v1
+2013-04-01,Origin and Transport Signatures of Spin-Orbit Interactions in One- and Two-Dimensional SrTiO$_3$-Based Heterostructures,"We study origin of Rashba spin-orbit interaction at SrTiO$_3$ surfaces and
+LaAlO$_3$/SrTiO$_3$ interfaces by considering the interplay between atomic
+spin-orbit coupling and inversion asymmetry at the surface or interface. We
+show that, in a simple tight-binding model involving 3d $t_{2g}$ bands of Ti
+ions, the induced spin-orbit coupling in the $d_{xz}$ and $d_{yz}$ bands is
+cubic in momentum whereas the spin-orbit interaction in the $d_{xy}$ band has
+linear momentum dependence. We also find that the spin-orbit interaction in
+one-dimensional channels at LaAlO$_3$/SrTiO$_3$ interfaces is linear in
+momentum for all bands. We discuss implications of our results for transport
+experiments on SrTiO$_3$ surfaces and LaAlO$_3$/SrTiO$_3$ interfaces. In
+particular, we analyze the effect of a given spin-orbit interaction term on
+magnetotransport of LaAlO$_3$/SrTiO$_3$ by calculating weak anti-localization
+corrections to the conductance and to universal conductance fluctuations.",1304.0464v2
+2020-11-02,Spin-orbital magnetic response of relativistic fermions with band hybridization,"Spins of relativistic fermions are related to their orbital degrees of
+freedom. In order to quantify the effect of hybridization between relativistic
+and nonrelativistic degrees of freedom on spin-orbit coupling, we focus on the
+spin-orbital (SO) crossed susceptibility arising from spin-orbit coupling. The
+SO crossed susceptibility is defined as the response function of their spin
+polarization to the ""orbital"" magnetic field, namely the effect of magnetic
+field on the orbital motion of particles as the vector potential. Once
+relativistic and nonrelativistic fermions are hybridized, their SO crossed
+susceptibility gets modified at the Fermi energy around the band hybridization
+point, leading to spin polarization of nonrelativistic fermions as well. These
+effects are enhanced under a dynamical magnetic field that violates thermal
+equilibrium, arising from the interband process permitted by the band
+hybridization. Its experimental realization is discussed for Dirac electrons in
+solids with slight breaking of crystalline symmetry or doping, and also for
+quark matter including dilute heavy quarks strongly hybridized with light
+quarks, arising in a relativistic heavy-ion collision process.",2011.00882v2
+2022-07-11,Spin-Orbit Proximity Effect in Bi/Co Multilayer: The Role of Interface Scattering,"The Spin-Orbit Proximity Effect is the raise of Spin-Orbit Coupling at a
+layer near to the interface with a strong spin-orbit material. It has been seen
+in several system such as graphene and ferromagnetic layers. The control of the
+Spin-Orbit Coupling can be a pathway to discover novel and exotic phases in
+superconductor and semimetallic systems. Here, we study the magnetoelectrical
+transport, i.e., magnetoresistance and anomalous Hall effect, in Cobalt/Bismuth
+multilayers looking for traces of spin-orbit proximity effect and evaluate the
+origin of such effect. Our results point for an increase of Spontaneous
+Magnetic Anisotropy of Resistivity and Anomalous Hall Resistivity at very low
+thicknesses of Cobalt. The analysis of the Anomalous Hall Resisitivity indicate
+that the Bismuth layers change the scattering mechanism of Hall effect to the
+extrinsic skew-scattering type, indicating that the spin-orbit proximity effect
+could be related to the elastic scattering of cobalt free carriers by bismuth
+sites at the interface.",2207.04937v1
+2023-10-08,Nonlinear Orbital and Spin Edelstein Effect in Centrosymmetric Metals,"Nonlinear spintronics combines nonlinear dynamics with spintronics, opening
+up new possibilities beyond linear responses. A recent theoretical work [Xiao
+et al., Phys. Rev. Lett. 130, 166302 (2023)] predicts the nonlinear generation
+of spin density [nonlinear spin Edelstein effect (NSEE)] in centrosymmetric
+metals based on symmetry analysis combined with first principle calculation.
+However, its microscopic mechanism is limited to a specific set of materials
+with local inversion symmetry breaking and is not applicable to general
+materials. This paper focuses on the fundamental role of orbital degrees of
+freedom for the nonlinear generation in centrosymmetric systems. Using a
+combination of tight-binding model and density functional theory calculations,
+we demonstrate that nonlinear orbital density can arise independently of
+spin-orbit coupling. In contrast, spin density follows through spin-orbit
+coupling. We further elucidate the microscopic mechanism responsible for this
+phenomenon, which involves the NSEE induced by electric-field-induced orbital
+Rashba texture. In addition, we also explore the potential applications of the
+nonlinear orbital and spin Edelstein effect for field-free switching of
+magnetization.",2310.05113v4
+2003-06-03,Spin transport in nanowires,"We study high-field spin transport of electrons in a quasi one-dimensional
+channel of a $GaAs$ gate controlled spin interferometer (SPINFET) using a
+semiclassical formalism (spin density matrix evolution coupled with Boltzmann
+transport equation). Spin dephasing (or depolarization) is predominantly caused
+by D'yakonov-Perel' relaxation associated with momentum dependent spin orbit
+coupling effects that arise due to bulk inversion asymmetry (Dresselhaus spin
+orbit coupling) and structural inversion asymmetry (Rashba spin orbit
+coupling). Spin dephasing length in a one dimensional channel has been found to
+be an order of magnitude higher than that in a two dimensional channel. This
+study confirms that the ideal configuration for a SPINFET is one where the
+ferromagnetic source and drain contacts are magnetized along the axis of the
+channel. The spin dephasing length in this case is about 22.5 microns at
+lattice temperature of 30K and 10 microns at lattice temperature of 77 K for an
+electric field of 2 kV/cm. Spin dephasing length has been found to be weakly
+dependent on the driving electric field and strongly dependent on the lattice
+temperature.",0306082v1
+2009-10-28,"Orbital fluctuations, spin-orbital coupling, and anomalous magnon softening in an orbitally degenerate ferromagnet","The correlated motion of electrons in the presence of strong orbital
+fluctuations and correlations is investigated with respect to magnetic
+couplings and excitations in an orbitally degenerate ferromagnet. Introduction
+of the orbital degree of freedom results in a class of diagrams representing
+spin-orbital coupling which become particularly important near the orbital
+ordering instability. Low-energy staggered orbital fluctuation modes,
+particularly with momentum near (\pi/2,\pi/2,0) (corresponding to CE-type
+orbital correlations), are shown to generically yield strong intrinsically
+non-Heisenberg (1-\cos q)^2 magnon self energy correction, resulting in no spin
+stiffness reduction, but strongly suppressed zone-boundary magnon energies in
+the Gamma-X direction. The zone-boundary magnon softening is found to be
+strongly enhanced with increasing hole doping and for narrow-band materials,
+which provides insight into the origin of zone-boundary anomalies observed in
+ferromagnetic manganites.",0910.5321v2
+2000-05-26,Theory of the solid-state physics on the turn: II. Importance of the spin-orbit coupling for 3d-ion compounds: the case of NiO,"The orbital and spin moment of the Ni2+ ion in NiO has been calculated at 0 K
+to be 0.54mB and 1.99 mB respectively. Such large orbital moment, more than 20%
+of the total moment of 2.53 mB, proves the need for the ''unquenching'' of the
+orbital moment in compounds containing 3d ions. It turns out that the
+spin-orbit coupling is indispensable for description of magnetic and electronic
+properties of 3d-ion compounds. These two findings, largely ignored at the
+nowadays in-fashion solid-state thories, call for an advanced solid-state
+physics theory.",0005471v1
+2005-06-16,Orbital order and spin-orbit coupling in BaVS3,"The correlated 3d sulphide BaVS3 undergoes a sequence of three symmetry
+breaking transitions which are reflected in the temperature dependence of the
+magnetic susceptibility, and its anisotropy. We introduce a microscopic model
+based on the coexistence of wide band a(1g) and localized e(g) d-electrons, and
+give the classification of the order parameters under the double space group
+and time reversal symmetries. Allowing for the relativistic spin-orbit
+coupling, the d-shell multipoles acquire a mixed spin-orbital character. It
+follows that orbital ordering is accompanied by a change in the susceptibility
+anisotropy",0506409v1
+2018-11-24,Collective dipole oscillations of a spin-orbit coupled Fermi gas,"The collective dipole mode is induced and measured in a spin-orbit (SO)
+coupled degenerate Fermi gas of $^{173}$Yb atoms. Using a differential optical
+Stark shift, we split the degeneracy of three hyperfine states in the ground
+manifold, and independently couple consecutive spin states with the equal Raman
+transitions. A relatively long-lived spin-orbit-coupled Fermi gas, readily
+being realized with a narrow optical transition, allows to explore a
+single-minimum dispersion where three minima of spin-1 system merge into and to
+monitor collective dipole modes of fermions in the strong coupling regime. The
+measured oscillation frequency of the dipole mode is compared with the
+semi-classical calculation in the single-particle regime. Our work should pave
+the way towards the characterization of spin-orbit-coupled fermions with large
+spin $s>\frac{1}{2}$ in the strong coupling regime.",1811.09846v1
+2016-11-16,Ferromagnetic order induced on graphene by Ni/Co proximity effects,"We build a tight-binding Hamiltonian describing Co/Ni over graphene,
+contemplating ATOP (a Co/Ni atom on top of each Carbon atom of one graphene
+sublattice) and HCP (one Co/Ni atom per Graphene plaquette) configurations. For
+the ATOP configuration the orbitals involved, for the Co/Ni, are the
+$d_{z^2-r^2}$ which most strongly couple to one graphene sublattice and the
+$d_{xz}$, $d_{yz}$ orbitals that couple directly to the second sublattice site.
+Such configuration is diagonal in pseudo-spin and spin space, yielding electron
+doping of the graphene and antiferro-magnetic ordering in the primitive cell in
+agreement with DFT calculations. The second, HCP configuration is symmetric in
+the graphene sublattices and only involves coupling to the $d_{xz}$, $d_{yz}$
+orbitals. The register of the lattices in this case allows for a new coupling
+between nearest neighbour sites, generating non-diagonal terms in the
+pseudo-spin space and novel spin-kinetic couplings mimicking a spin-orbit
+coupling generated by a magnetic coupling. The resulting proximity effect in
+this case yields ferromagnetic order in the graphene substrate. We derive the
+band structure in the vicinity of the K points for both configurations, the
+Bloch wavefunctions and their spin polarization.",1611.05464v1
+2016-11-21,Relativistic orbits around spinning supermassive black holes. Secular evolution to 4.5 post-Newtonian order,"We derive the secular evolution of the orbital elements of a stellar-mass
+object orbiting a spinning massive black hole. We use the post-Newtonian
+approximation in harmonic coordinates, with test-body equations of motion for
+the conservative dynamics that are valid through 3PN order, including
+spin-orbit, quadrupole and (spin)$^2$ effects, and with radiation-reaction
+contributions linear in the mass of the body that are valid through 4.5PN
+order, including the 4PN damping effects of spin-orbit coupling. The evolution
+equations for the osculating orbit elements are iterated to high PN orders
+using a two-timescale approach and averaging over orbital timescales. We derive
+a criterion for terminating the orbit when its Carter constant drops below a
+critical value, whereupon the body plunges across the event horizon at the next
+closest approach. The results are valid for arbitrary eccentricities and
+arbitrary inclinations. We then analyze numerically the orbits of objects
+injected into high-eccentricity orbits via interactions within a surrounding
+star cluster, obtaining the number of orbits and the elapsed time between
+injection and plunge, and the residual orbital eccentricity at plunge as a
+function of inclination. We derive an analytic approximation for the time to
+plunge in terms of initial orbital variables. We show that, if the black hole
+is spinning rapidly, the flux of gravitational radiation during the final orbit
+before plunge may be suppressed by as much as three orders of magnitude if the
+orbit is retrograde on the equatorial plane compared to its prograde
+counterpart.",1611.06931v1
+2000-05-22,The orbital moment in NiO,"The orbital and spin moment of the Ni2+ ion in NiO has been calculated within
+the quasi-atomic approach. The orbital moment of 0.54 mB amounts at 0 K, in the
+magnetically-ordered state, to more than 20% of the total moment (2.53 mB). For
+this outcome, being in nice agreement with the recent experimental finding
+taking into account the spin-orbit coupling is indispensable.",0005358v1
+2000-08-18,Large Orbital Magnetic Moment in Febr2,"Magnetic moment of the Fe2+ ion in FeBr2 has been calculated to be 4.32 mB in
+the magnetically-ordered state at 0 K. It is composed from the spin moment of
+3.52 mB and the orbital moment of +0.80 mB. These calculations show that for
+the meaningful analysis of e-m properties of FeBr2 the spin-orbit coupling is
+essentially important and that the orbital moment is largely unquenched.",0008274v1
+2001-12-12,Exchange Interaction in Binuclear Complexes with Rare Earth and Copper Ions: A Many-Body Model Study,"We have used a many-body model Hamiltonian to study the nature of the
+magnetic ground state of hetero-binuclear complexes involving rare-earth and
+copper ions. We have taken into account all diagonal repulsions involving the
+rare-earth 4f and 5d orbitals and the copper 3d orbital. Besides, we have
+included direct exchange interaction, crystal field splitting of the rare-earth
+atomic levels and spin-orbit interaction in the 4f orbitals. We have identified
+the inter-orbital $4f$ repulsion, U$_{ff}$ and crystal field parameter,
+$\Delta_f$ as the key parameters involved in controlling the type of exchange
+interaction between the rare earth $4f$ and copper 3d spins. We have explored
+the nature of the ground state in the parameter space of U$_{ff}$, $\Delta_f$,
+spin-orbit interaction strength $\lambda$ and the $4f$ filling n$_f$. We find
+that these systems show low-spin or high-spin ground state depending on the
+filling of the $4f$ levels of the rare-earth ion and ground state spin is
+critically dependent on U$_{ff}$ and $\Delta_f$. In case of half-filling
+(Gd(III)) we find a reentrant low-spin state as U$_{ff}$ is increased, for
+small values of $\Delta_f$, which explains the recently reported apparent
+anomalous anti-ferromagnetic behaviour of Gd(III)-radical complexes. By varying
+U$_{ff}$ we also observe a switch over in the ground state spin for other
+fillings . We have introduced a spin-orbit coupling scheme which goes beyond
+L-S or j-j coupling scheme and we find that spin-orbit coupling does not
+significantly alter the basic picture.",0112208v1
+2012-03-06,Energy spectrum and Landau levels in bilayer graphene with spin-orbit interaction,"We present a theoretical study of the bandstructure and Landau levels in
+bilayer graphene at low energies in the presence of a transverse magnetic field
+and Rashba spin-orbit interaction in the regime of negligible trigonal
+distortion. Within an effective low energy approach (L\""owdin partitioning
+theory) we derive an effective Hamiltonian for bilayer graphene that
+incorporates the influence of the Zeeman effect, the Rashba spin-orbit
+interaction, and inclusively, the role of the intrinsic spin-orbit interaction
+on the same footing. Particular attention is spent to the energy spectrum and
+Landau levels. Our modeling unveil the strong influence of the Rashba coupling
+$\lambda_R $ in the spin-splitting of the electron and hole bands. Graphene
+bilayers with weak Rashba spin-orbit interaction show a spin-splitting linear
+in momentum and proportional to $\lambda_R $, but scales inversely proportional
+to the interlayer hopping energy $\gamma_1$. However, at robust spin-orbit
+coupling $\lambda_R $ the energy spectrum shows a strong warping behavior near
+the Dirac points. We find the bias-induced gap in bilayer graphene to be
+decreasing with increasing Rashba coupling, a behavior resembling a topological
+insulator transition. We further predict an unexpected assymetric
+spin-splitting and crossings of the Landau levels due to the interplay between
+the Rashba interaction and the external bias voltage. Our results are of
+relevance for interpreting magnetotransport and infrared cyclotron resonance
+measurements, including also situations of comparatively weak spin-orbit
+coupling.",1203.1094v2
+2013-01-22,Validity of single-channel model for a spin-orbit coupled atomic Fermi gas near Feshbach resonances,"We theoretically investigate a Rashba spin-orbit coupled Fermi gas near
+Feshbach resonances, by using mean-field theory and a two-channel model that
+takes into account explicitly Feshbach molecules in the close channel. In the
+absence of spin-orbit coupling, when the channel coupling $g$ between the
+closed and open channels is strong, it is widely accepted that the two-channel
+model is equivalent to a single-channel model that excludes Feshbach molecules.
+This is the so-called broad resonance limit, which is well-satisfied by
+ultracold atomic Fermi gases of $^{6}$Li atoms and $^{40}$K atoms in current
+experiments. Here, with Rashba spin-orbit coupling we find that the condition
+for equivalence becomes much more stringent. As a result, the single-channel
+model may already be insufficient to describe properly an atomic Fermi gas of
+$^{40}$K atoms at a moderate spin-orbit coupling. We determine a characteristic
+channel coupling strength $g_{c}$ as a function of the spin-orbit coupling
+strength, above which the single-channel and two-channel models are
+approximately equivalent. We also find that for narrow resonance with small
+channel coupling, the pairing gap and molecular fraction is strongly suppressed
+by SO coupling. Our results can be readily tested in $^{40}$K atoms by using
+optical molecular spectroscopy.",1301.5071v1
+2007-09-03,Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction,"We investigate the enhancement of spin polarization in a quantum wire in the
+presence of a constriction and a spin-orbit coupling segment. It is shown that
+the spin-filtering effect is significantly heightened in comparison with the
+configuration without the constriction. It is understood in the studies that
+the constriction structure plays a critical role in enhancing the spin
+filtering by means of confining the incident electrons to occupy one channel
+only while the outgoing electrons occupy two channels. The enhancement of
+spin-filtering has also been analyzed within the perturbation theory. Because
+the spin polarization arises mainly from the scattering between the
+constriction and the segment with spin-orbit coupling, the sub-band mixing
+induced by spin-orbit interaction in the scattering process and the
+interferences result in higher spin-filtering effect.",0709.0203v1
+2009-09-13,Fluctuations of spin transport through chaotic quantum dots with spin-orbit coupling,"As devices to control spin currents using the spin-orbit interaction are
+proposed and implemented, it is important to understand the fluctuations that
+spin-orbit coupling can impose on transmission through a quantum dot. Using
+random matrix theory, we estimate the typical scale of transmitted charge and
+spin currents when a spin current is injected into a chaotic quantum dot with
+strong spin-orbit coupling. These results have implications for the functioning
+of the spin transistor proposed by Schliemann, Egues, and Loss. We use a
+density matrix formalism appropriate for treating arbitrary input currents and
+indicate its connections to the widely used spin-conductance picture. We
+further consider the case of currents entangled between two leads, finding
+larger fluctuations.",0909.2443v1
+2012-07-27,Spin transition rates in nanowire superlattices: Rashba spin-orbit coupling effects,"We investigate the influence of Rashba spin-orbit coupling in a parabolic
+nanowire modulated by longitudinal periodic potential. The modulation potential
+can be obtained from realistically grown supperlattices (SLs). Our study shows
+that the Rashba spin-orbit interaction induces the level crossing point in the
+parabolic nanowire SLs. We estimate large anticrossing width (approximately 117
+$\mu eV$) between singlet-triplet states. We study the phonon and
+electromagnetic field mediated spin transition rates in the parabolic nanowire
+SLs. We report that the phonon mediated spin transition rate is several order
+of magnitude larger than the electromagnetic field mediated spin transition
+rate. Based on the Feynman disentangling technique, we find the exact spin
+transition probability. For the case wave vector $k=0$, we report that the
+transition probability can be tuned in the form of resonance at fixed time
+interval. For the general case ($k\neq 0$), we solve the Riccati equation and
+find that the arbitrary values of $k$ induces the damping in the transition
+probability. At large value of Rashba spin-orbit coupling coefficients for
+($k\neq 0$), spin transition probability freezes.",1207.6580v2
+2015-07-16,Strong Linear Dichroism in Spin-Polarized Photoemission from Spin-Orbit-Coupled Surface States,"A comprehensive understanding of spin-polarized photoemission is crucial for
+accessing the electronic structure of spin-orbit coupled materials. Yet, the
+impact of the final state in the photoemission process on the photoelectron
+spin has been difficult to assess in these systems. We present experiments for
+the spin-orbit split states in a Bi-Ag surface alloy showing that the
+alteration of the final state with energy may cause a complete reversal of the
+photoelectron spin polarization. We explain the effect on the basis of ab
+initio one-step photoemission theory and describe how it originates from linear
+dichroism in the angular distribution of photoelectrons. Our analysis shows
+that the modulated photoelectron spin polarization reflects the intrinsic spin
+density of the surface state being sampled differently depending on the final
+state, and it indicates linear dichroism as a natural probe of spin-orbit
+coupling at surfaces.",1507.04664v2
+2015-03-23,Quantum spin Hall phase in multilayer graphene,"The so called quantum spin Hall phase is a topologically non trivial
+insulating phase that is predicted to appear in graphene and graphene-like
+systems. In this work we address the question of whether this topological
+property persists in multilayered systems. We consider two situations: purely
+multilayer graphene and heterostructures where graphene is encapsulated by
+trivial insulators with a strong spin-orbit coupling. We use a four orbital
+tight-binding model that includes the full atomic spin-orbit coupling and we
+calculate the $Z_{2}$ topological invariant of the bulk states as well as the
+edge states of semi-infinite crystals with armchair termination. For
+homogeneous multilayers we find that even when the spin-orbit interaction opens
+a gap for all the possible stackings, only those with odd number of layers host
+gapless edge states while those with even number of layers are trivial
+insulators. For the heterostructures where graphene is encapsulated by trivial
+insulators, it turns out that the interlayer coupling is able to induce a
+topological gap whose size is controlled by the spin-orbit coupling of the
+encapsulating materials, indicating that the quantum spin Hall phase can be
+induced by proximity to trivial insulators.",1503.06736v1
+2016-02-04,Spin-orbit coupling measurement by the scanning gate microscopy,"We propose a procedure for extraction of the Fermi surface for a
+two-dimensional electron gas with a strong Rashba spin-orbit coupling from
+conductance microscopy. Due to the interplay between the effective spin-orbit
+magnetic field and the external one within the plane of confinement, the
+backscattering induced by a charged tip of an atomic force microscope located
+above the sample, leads to the spin precession, and thus to the spin mixing of
+the incident and reflected modes. This mixing leads to a characteristic
+angle-dependent beating pattern visible in the conductance maps. We show that
+the structure of the Fermi level, bearing signatures of the spin-orbit
+coupling, can be extracted from the Fourier transform of the interference
+fringes in the conductance maps as a function of the magnetic field direction.
+We propose a simple analytical model which can be used to fit the experimental
+data in order to obtain the spin-orbit coupling constant.",1602.01653v1
+2014-05-22,Fragmentation of Spin-orbit Coupled Spinor Bose-Einstein Condensates,"The fragmentation of spin-orbit coupled spin-1 Bose gas with a weak
+interaction in external harmonic trap is explored by both exact diagonalization
+and mean-field theory. This fragmentation tendency, which originates from the
+total angular momentum conservation, is affected obviously by the spin-orbit
+coupling strength and the spin-dependent interaction. Strong spin-orbit
+interaction raises the inverse participation ratio, which describes the number
+of significantly occupied single-particle states. As the spin-dependent
+interaction changes from anti-ferromagnetic to ferromagnetic, the peak values
+in the inverse participation ratio become lower. Without the confinement of the
+appointed total angular momentum, the condensate chooses a zero or finite total
+angular momentum ground state, which is determined by both the interaction and
+the spin-orbit coupling strength.",1405.5708v1
+2006-06-19,Spin-Orbit Coupling and Tunneling Current in a Parabolic Quantum Dot,"We propose a novel approach to explore the properties of a quantum dot in the
+presence of the spin-orbit interaction and in a tilted magnetic field. The
+spin-orbit coupling within the quantum dot manifest itself as anti-crossing of
+the energy levels when the tilt angle is varied. The anti-crossing gap has a
+non-monotonic dependence on the magnitude of the magnetic field and exhibits a
+peak at some finite values of the magnetic field. From the dependence of the
+tunneling current through the quantum dot on the bias voltage and the tilt
+angle, the anti-crossing gap and most importantly the spin-orbit strength can
+be uniquely determined.",0606500v1
+2007-02-16,Spin-orbit induced anisotropy in the tunneling magnetoresistance of magnetic tunnel junctions,"The effects of the spin-orbit interaction on the tunneling magnetoresistance
+of magnetic tunnel junctions are investigated. A model in which the
+experimentally observed two-fold symmetry of the anisotropic tunneling
+magnetoresistance (TAMR) originates from the interference between Dresselhaus
+and Bychkov-Rashba spin-orbit couplings is formulated. Bias induced changes of
+the Bychkov-Rashba spin-orbit coupling strength can result in an inversion of
+the TAMR. The theoretical calculations are in good agreement with the TAMR
+experimentally observed in epitaxial Fe/GaAs/Au tunnel junctions.",0702387v2
+2007-11-05,Magnetic excitations in vanadium spinels,"We study magnetic excitations in vanadium spinel oxides AV$_2$O$_4$ (A=Zn,
+Mg, Cd) using two models: first one is a superexchange model for vanadium S=1
+spins, second one includes in addition spin-orbit coupling, and crystal
+anisotropy. We show that the experimentally observed magnetic ordering can be
+obtained in both models, however the orbital ordering is different with and
+without spin-orbit coupling and crystal anisotropy. We demonstrate that this
+difference strongly affects the spin-wave excitation spectrum above the
+magnetically ordered state, and argue that the neutron measurement of such
+dispersion is a way to distinguish between the two possible orbital orderings
+in AV$_2$O$_4$.",0711.0732v1
+2008-03-26,Does Spin-Orbit Coupling Effect Favor Planar Structures for Small Platinum Clusters?,"We have performed full-relativistic density functional theory calculations to
+study the geometry and binding energy of different isomers of free platinum
+clusters Pt$_{n}$ ($n=4-6$) within the spin multiplicities from singlet to
+nonet. The spin-orbit coupling effect has been discussed for the minimum-energy
+structures, relative stabilities, vibrational frequencies, magnetic moments,
+and the highest occupied and lowest unoccupied molecular-orbital gaps. It is
+found in contrast to some of the previous calculations that 3-dimentional
+configurations are still lowest energy structures of these clusters, although
+spin-orbit effect makes some planar or quasi-planar geometries more stable than
+some other 3-dimentional isomers.",0803.3694v1
+2015-11-09,Spin-orbit interaction in the graphitic nanocone,"The Hamiltonian for nanocones with curvature induced spin orbit coupling have
+been derived. The effect of curvature induced spin orbit coupling on the
+electronic properties of graphitic nanocones is considered. Energy spectra for
+different numbers of the pentagonal defects in the tip of the nanocones are
+calculated. It was shown that the spin orbit interaction considerably affects
+the local density of states of the graphitic nanocone. This influence depends
+on the number of defects present at the tip of the nanocone. This property
+could be applied in atomic force microscopy for the construction of the probing
+tip.",1511.02765v1
+2020-05-06,Angular momentum conservation in counter-propagating vectorially structured light,"It is well-known that electric spin angular momentum and electric orbital
+angular momentum are conserved under paraxial propagation of travelling waves
+in free-space. Here we study the electric and magnetic angular momentum in
+counter-propagating waves and show both theoretically and experimentally that
+neither component alone is conserved except in special cases. We attribute this
+non-conservation to spin-spin and orbit-orbit coupling between the electric and
+magnetic fields. This work generalises previous findings based on travelling
+waves, explains the apparent spin-orbit coupling in counter-propagating
+paraxial light, and broadens our understanding of angular momentum conservation
+in arbitrary structured light waves.",2005.02739v1
+2020-05-12,Magnetically-textured superconductivity in elemental Rhenium,"Recent $\mu$SR measurements revealed remarkable signatures of spontaneous
+magnetism coexisting with superconductivity in elemental rhenium. Here we
+provide a quantitative theory that uncovers the nature of the superconducting
+instability by incorporating every details of the electronic structure together
+with spin-orbit coupling and multi-orbital physics. We show that conventional
+$s$-wave superconductivity combined with strong spin-orbit coupling is inducing
+even-parity odd-orbital spin triplet Cooper pairs, and in presence of a screw
+axis Cooper pairs' migration between the induced equal-spin triplet component
+leads to an exotic magnetic state.",2005.05702v2
+2012-02-09,Spin-orbit coupling induced fractionalized Skyrmion excitations in rotating and rapidly quenched spin-1 Bose-Einstein condensates,"We investigate the fractionalized Skyrmion excitations induced by spin-orbit
+coupling in rotating and rapidly quenched spin-1 Bose-Einstein condensates. Our
+results show that the fractionalized Skyrmion excitation depends on the
+combination of spin-orbit coupling and rotation, and it originates from a
+dipole structure of spin which is always embedded in three vortices constructed
+by each condensate component respectively. When spin-orbit coupling is larger
+than a critical value, the fractionalized Skyrmions encircle the center with
+one or several circles to form a radial lattice, which occurs even in the
+strong ferromagnetic/antiferromagnetic condensates. We can use both the
+spin-orbit coupling and the rotation to adjust the radial lattice. The
+realization and the detection of the fractionalized Skyrmions are compatible
+with current experimental technology.",1202.1911v3
+2010-07-20,RKKY interaction in a disordered two-dimensional electron gas with Rashba and Dresselhaus spin-orbit couplings,"We study theoretically the statistical properties of the
+Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between localized magnetic
+moments in a disordered two-dimensional electron gas with both Rashba and
+Dresselhaus spin-orbit couplings. Averaging over disorder, the static spin
+susceptibility tensor is evaluated diagrammatically in the mesoscopic
+(phase-coherent) regime. The disorder-averaged susceptibility leads to a
+twisted exchange interaction suppressed exponentially with distance, whereas
+the second-order correlations, which determine the fluctuations (variance) of
+the RKKY energy, decay with the same power-law as in the clean case. We obtain
+analytic expressions in the limits of large/small spin orbit interactions and
+for equal Rashba and Dresselhaus couplings. Beside these limiting cases, we
+study numerically the variance of the RKKY interaction in the presence of pure
+Rashba spin-orbit coupling. Our results are relevant for magnetic impurities or
+nuclear moments embedded in III-V two-dimensional heterostructures or in
+contact with surface states of metals and metal alloys, which can display a
+sizable Rashba spin-orbit coupling.",1007.3506v2
+2012-11-29,Topological transport in a spin-orbit coupled bosonic Mott insulator,"We investigate topological transport in a spin-orbit coupled bosonic Mott
+insulator. We show that interactions can lead to anomalous quasi-particle
+dynamics even when the spin-orbit coupling is abelian. To illustrate the
+latter, we consider the spin-orbit coupling realized in the experiment of Lin
+\textit{et al}. [Nature (London) \textbf{471}, 83 (2011)]. For this spin-orbit
+coupling, we compute the quasiparticle dispersions and spectral weights, the
+interaction-induced momentum space Berry curvature, and the momentum space
+distribution of spin density, and propose experimental signatures. Furthermore,
+we find that in our approximation for the single-particle propagator, the
+ground state can in principle support an integer Hall conductivity if the sum
+of the Chern numbers of the hole bands is nonzero.",1211.6924v2
+2012-12-03,Collective modes of spin-orbit coupled Fermi gases in the repulsive regime,"We investigate the collective modes in the spin-orbit coupled Fermi gas with
+repulsive s-wave interaction. The interplay between spin-orbit coupling and
+atom-atom interactions plays the crucial role in the collective behaviors of
+Fermi gas. In contrast with ordinary Fermi liquid, spin-orbit coupled Fermi gas
+has strongly correlated spin and density excitations. Within the scheme of
+random phase approximation, we classify collective modes based on the symmetry
+group and determine their properties via the poles of corresponding correlation
+functions. Besides, the particle-hole continuum is obtained, where the
+imaginary part of these correlation functions become non-vanishing. We make
+comparisons with collective excitations in the ordinary Fermi liquid without
+spin-orbit coupling and in a helical liquid, i.e., surface states of a three
+dimensional topological insulator. We also propose an experimental protocol for
+detecting these collective modes and discuss corresponding experimental
+signatures in the ultracold Fermi gases experiment.",1212.0424v3
+2013-04-14,FFLO or Majorana superfluids: The fate of fermionic cold atoms in spin-orbit coupled optical lattices,"The recent experimental realization of spin-orbit coupling (SOC) for
+ultra-cold atoms opens a completely new avenue for exploring new quantum
+matter. In experiments, the SOC is implemented simultaneously with a Zeeman
+field. Such spin-orbit coupled Fermi gases are predicted to support Majorana
+fermions with non-Abelian exchange statistics in one dimension (1D). However,
+as shown in recent theory and experiments for 1D spin-imbalanced Fermi gases,
+the Zeeman field can lead to the long-sought Fulde-Ferrell-Larkin-Ovchinnikov
+(FFLO) superfluids with non-zero momentum Cooper pairings, in contrast to the
+zero momentum pairing in Majorana superfluids. Therefore a natural question to
+ask is which phase, FFLO or Majorana superfluids, will survive in spin-orbit
+coupled Fermi gases in the presence of a large Zeeman field. In this paper, we
+address this question by studying the mean field quantum phases of 1D
+(quasi-1D) spin-orbit coupled fermionic cold atom optical lattices.",1304.3926v2
+2014-02-26,Superconductivity in a two-dimensional superconductor with Rashba and Dresselhaus spin-orbit couplings,"We present a general model with both Rashba and Dresselhaus spin-orbit
+couplings to describe a two-dimensional noncentrosymmetric superconductor. The
+combined effects of the two spin-orbit couplings on superconductivity are
+investigated in the framework of mean-field theory. We find that the Rashba and
+Dresselhaus spin-orbit couplings result in similar effects on superconductivity
+if they are present solely in the system. Mixing of spin-singlet and triplet
+pairings in electron band is induced under the assumption that each
+quasiparticle band is p-wave paired. If the two types of spin-orbit couplings
+appear jointly, both the singlet and triplet pairings are weakened and
+decreased down to their minimum values in the equal-Rashba-Dresselhaus case.",1402.6483v1
+2014-09-20,Interference of spin-orbit coupled Bose-Einstein condensates,"Interference of atomic Bose-Einstein condensates, observed in free expansion
+experiments, is a basic characteristic of their quantum nature. The ability to
+produce synthetic spin-orbit coupling in Bose-Einstein condensates has recently
+opened a new research field. Here we theoretically describe interference of two
+noninteracting spin-orbit coupled Bose-Einstein condensates in an external
+synthetic magnetic field. We demonstrate that the spin-orbit and the Zeeman
+couplings strongly influence the interference pattern determined by the angle
+between the spins of the condensates, as can be seen in time-of-flight
+experiments. We show that a quantum backflow, being a subtle feature of the
+interference, is, nevertheless, robust against the spin-orbit coupling and
+applied synthetic magnetic field.",1409.5889v1
+2014-10-07,Pairing Superfluidity in Spin-Orbit Coupled Ultracold Fermi Gases,"We review some recent progresses on the study of ultracold Fermi gases with
+synthetic spin-orbit coupling. In particular, we focus on the pairing
+superfluidity in these systems at zero temperature. Recent studies have shown
+that different forms of spin-orbit coupling in various spatial dimensions can
+lead to a wealth of novel pairing superfluidity. A common theme of these
+variations is the emergence of new pairing mechanisms which are direct results
+of spin-orbit-coupling-modified single-particle dispersion spectra. As
+different configurations can give rise to single-particle dispersion spectra
+with drastic differences in symmetry, spin dependence and low-energy density of
+states, spin-orbit coupling is potentially a powerful tool of quantum control,
+which, when combined with other available control schemes in ultracold atomic
+gases, will enable us to engineer novel states of matter.",1410.1595v1
+2012-05-03,Current-induced torques in textured Rashba ferromagnets,"In systems with small spin-orbit coupling, current-induced torques on the
+magnetization require inhomogeneous magnetization textures. For large
+spin-orbit coupling, such torques exist even without gradients in the
+magnetization direction. Here, we consider current-induced torques in
+ferromagnetic metals with both Rashba spin-orbit coupling and inhomogeneous
+magnetization. We first phenomenologically construct all torques that are
+allowed by the symmetries of the system, to first order in
+magnetization-direction gradients and electric field. Second, we use a
+Boltzmann approach to calculate the spin torques that arise to second order in
+the spin-orbit coupling. We apply our results to current-driven domain walls
+and find that the domain-wall mobility is strongly affected by torques that
+result from the interplay between spin-orbit coupling and inhomogeneity of the
+magnetization texture.",1205.0653v1
+2020-05-16,Spin-orbit-parity coupled superconductivity in topological monolayer WTe$_2$,"Recent experiments reported gate-induced superconductivity in the monolayer
+1T$'$-WTe$_2$ which is a two-dimensional topological insulator in its normal
+state [1, 2]. The in-plane upper critical field $B_{c2}$ is found to exceed the
+conventional Pauli paramagnetic limit $B_p$ by 1-3 times. The enhancement
+cannot be explained by conventional spin-orbit coupling which vanishes due to
+inversion symmetry. In this work, we unveil some distinctive superconducting
+properties of centrosymmetric 1T$'$-WTe$_2$ which arise from the coupling of
+spin, momentum and band parity degrees of freedom. As a result of this
+spin-orbit-parity coupling: (i) there is a first-order superconductor-metal
+transition at $B_{c2}$ much higher than the Pauli paramagnetic limit $B_p$,
+(ii) spin-susceptibility is anisotropic with respect to in-plane directions and
+results in anisotropic $B_{c2}$ and (iii) the $B_{c2}$ exhibits a strong gate
+dependence as the spin-orbit-parity coupling is significant only near the
+topological band crossing points. The importance of SOPC on the topologically
+nontrivial inter-orbital pairing phase is also discussed. Our theory generally
+applies to centrosymmetric materials with topological band inversions.",2005.08007v2
+2020-10-19,Ultrafast dynamics in relativistic Mott insulators,"We study the photoinduced ultrafast dynamics in relativistic Mott insulators,
+i.e., Mott insulators with strong spin-orbit coupling. For this purpose, we
+consider a minimal one-band Hubbard model on lattices with square and
+triangular symmetries, as relevant for layered transition metal compounds such
+as Sr$_2$IrO$_4$. Depending on the lattice and the spin-orbit coupling, the
+systems have canted antiferromagnetic or $120^\circ$ order. They are excited by
+simulating a short laser pulse, and the dynamics is solved using nonequilibrium
+dynamical mean-field theory. The pulse generates hot carriers, which
+subsequently perturb the magnetic order due to the coupling between the
+collective order and photocarriers. We find that this dynamics, which is known
+form regular antiferromagnets, depends sensitively on the spatial structure of
+the spin-orbit coupling. On the triangular lattice, in particular, relaxation
+times are influenced by the spin-orbit coupling for the chiral $120^\circ$
+order, while on the square lattice with canted antiferromagnetic order the
+spin-orbit induced canting angle remains unchanged after the excitation. Our
+study opens up new possibilities of controlling magnetism and exotic spin
+states on the ultrafast timescales.",2010.09253v1
+2019-04-26,Effects of Interface Steps on the Valley Orbit coupling in a Si/SiGe quantum dot,"Valley-orbit coupling is a key parameter for a silicon quantum dot in
+determining its suitability for applications in quantum information processing.
+In this paper we study the effect of interface steps on the magnitude and phase
+of valley-orbit coupling for an electron in a silicon quantum dot. Within the
+effective mass approximation, we find that the location of a step on the
+interface is important in determining both the magnitude and the phase of the
+valley-orbit coupling in a Si/SiGe quantum dot. Specifically, our numerical
+results show that the magnitude of valley orbit coupling can be suppressed up
+to 75\% by a step of one atomic monolayer, and its phase can change by almost
+$\pi$. When two steps are present, the minimum value of the valley-orbit
+coupling can even approach zero. We also clarify the effects of an applied
+external magnetic field and the higher orbital states on the valley-orbit
+coupling. Overall, our results illustrate how interface roughness affect the
+valley-orbit coupling in silicon, and how spin qubits in silicon may be
+affected.",1904.11944v1
+2020-10-08,Spin-orbit coupling induced splitting of Yu-Shiba-Rusinov states in antiferromagnetic dimers,"Magnetic atoms coupled to the Cooper pairs of a superconductor induce
+Yu-Shiba-Rusinov states (in short Shiba states). In the presence of
+sufficiently strong spin-orbit coupling, the bands formed by hybridization of
+the Shiba states in ensembles of such atoms can support low-dimensional
+topological superconductivity with Majorana bound states localized on the
+ensembles' edges. Yet, the role of spin-orbit coupling for the hybridization of
+Shiba states in dimers of magnetic atoms, the building blocks for such systems,
+is largely unexplored. Here, we reveal the evolution of hybridized
+multi-orbital Shiba states from a single Mn adatom to artificially constructed
+ferromagnetically and antiferromagnetically coupled Mn dimers placed on a
+Nb(110) surface. Upon dimer formation, the atomic Shiba orbitals split for both
+types of magnetic alignment. Our theoretical calculations attribute the
+unexpected splitting in antiferromagnetic dimers to spin-orbit coupling and
+broken inversion symmetry at the surface. Our observations point out the
+relevance of previously unconsidered factors on the formation of Shiba bands
+and their topological classification.",2010.04031v1
+2004-03-29,"Ground state, electronic structure and magnetism of LaMnO3","We have calculated the discrete low-energy electronic structure in LaMnO3
+originating from the atomic-like states of the strongly correlated 3d4
+electronic system occurring in the Mn3+ ion. We take into account very strong
+intra-atomic correlations, crystal field interactions and the intra-atomic
+spin-orbit coupling. We calculated magnetic and paramagnetic state of LaMnO3
+within the consistent description given by Quantum Atomistic Solid State Theory
+(QUASST). Our studies indicate that the intra-atomic spin-orbit coupling and
+the orbital magnetism are indispensable for the physically adequate description
+of electronic and magnetic properties of LaMnO3.
+  Keywords: 3d oxides, crystal field, spin-orbit coupling, LaMnO3
+  PACS: 71.70Ej, 75.10Dg",0403714v1
+2007-01-18,Cooperative Effect of Electron Correlation and Spin-Orbit Coupling on the Electronic and Magnetic Properties of Ba2NaOsO6,"The electronic and magnetic properties of the cubic double perovskite
+Ba2NaOsO6 were examined by performing first-principles density functional
+theory calculations and analyzing spin-orbit coupled states of an Os7+ (d1) ion
+at an octahedral crystal field. The insulating behavior of Ba2NaOsO6 was shown
+to originate from a cooperative effect of electron correlation and spin-orbit
+coupling. This cooperative effect is responsible not only for the absence of
+orbital ordering in Ba2 NaOsO6 but also for a small magnetic moment and a weak
+magnetic anisotropy in Ba2NaOsO6.",0701460v1
+2015-07-21,Cooperative effects of lattice and spin-orbit coupling on the electronic structure of orthorhombic SrIrO3,"Orthorhombic SrIrO3 subjected to strain show tunable transport properties.
+With underlying symmetry remaining invariant, these properties are associated
+with IrO6 octahedral tilting. Adopting to first-principles methods, the effects
+of crystal field, spin-orbit coupling, and Coulomb correlations, on comparable
+interaction length scales, are discussed. While tilting induces a t2g-eg
+crystal-field splitting and band narrowing, spin-orbit coupling induces a
+partial splitting of the Jeff bands rendering SrIrO3 a semi-metallic ground
+state. The SOC enhanced hybridization of Ir-O orbitals, serve as a explanation
+to why the critical Hubbard correlation strength increases with increasing SOC
+strength in SrIrO3 to induce an insulating phase.",1507.05704v1
+2023-05-21,Spin-orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions,"Spin-transfer and spin-orbit torques allow controlling magnetic degrees of
+freedom in various materials and devices. However, while the transfer of
+angular momenta between electrons has been widely studied, the contribution of
+nuclear spins has yet to be explored further. This article demonstrates that
+the hyperfine coupling, which consists of Fermi contact and dipolar
+interactions, can mediate the application of spin-orbit torques acting on
+nuclear spins. Our starting point is a sizable nuclear spin in a metal with
+electronic spin accumulation. Then, via the hyperfine interactions, the nuclear
+spin modifies the an electronic spin density. The reactions to the equilibrium
+and nonequilibrium components of the spin density is a torque on the nucleus
+with field-like and damping-like components, respectively. This nuclear
+spin-orbit torque is a step toward stabilizing and controlling nuclear magnetic
+momenta, in magnitude and direction, and realizing nuclear spintronics.",2305.12390v2
+2022-12-16,Transverse currents in spin transistors,"In many systems, planar Hall effect wherein transverse signal appears in
+response to longitudinal stimulus is rooted in spin-orbit coupling. A spin
+transistor put forward by Datta and Das on the other hand consists of
+ferromagnetic leads connected to spin-orbit coupled central region and its
+conductance can be controlled by tuning the strength of spin-orbit coupling. We
+find that transverse currents also appear in Datta-Das transistors made by
+connecting two two-dimensional ferromagnetic reservoirs to a central spin-orbit
+coupled two-dimensional electron gas. We find that the spin transistor exhibits
+a nonzero transverse conductivity which depends on the direction of
+polarization in ferromagnets and the location where it is measured. We study
+the conductivities for the system with finite and infinite widths. The
+conductivities exhibit Fabry-P\'erot type oscillations as the length of the
+spin-orbit coupled regions is varied. Interestingly, even in the limit when
+longitudinal conductivity is made zero by cutting off the junction between the
+central spin-orbit coupled region and the ferromagnetic lead on one side
+(right), the transverse conductivities remain nonzero in the regions that are
+on the left side of the cut-off junction.",2212.08301v4
+2020-04-02,Tunable and Enhanced Rashba Spin-Orbit Coupling in Iridate-Manganite Heterostructures,"Tailoring spin-orbit interactions and Coulomb repulsion are the key features
+to observe exotic physical phenomena such as magnetic anisotropy and
+topological spin texture at oxide interfaces. Our study proposes a novel
+platform for engineering the magnetism and spin-orbit coupling at LaMnO3/SrIrO3
+(3d-5d oxide) interfaces by tuning the LaMnO3 growth conditions which controls
+the lattice displacement and spin-correlated interfacial coupling through
+charge transfer. We report on a tunable and enhanced interface-induced Rashba
+spin-orbit coupling and Elliot-Yafet spin relaxation mechanism in LaMnO3/SrIrO3
+bilayer with change in the underlying magnetic order of LaMnO3. We also
+observed enhanced spin-orbit coupling strength in LaMnO3/SrIrO3 compared to
+previously reported SrIrO3 layers. The X-Ray spectroscopy measurement reveals
+the quantitative valence of Mn and their impact on charge transfer. Further, we
+performed angle-dependent magnetoresistance measurements, which show signatures
+of magnetic proximity effect in SrIrO3 while reflecting the magnetic order of
+LaMnO3. Our work thus demonstrates a new route to engineer the interface
+induced Rashba spin-orbit coupling and magnetic proximity effect in 3d-5d oxide
+interfaces which makes SrIrO3 an ideal candidate for spintronics applications.",2004.00800v1
+2021-06-30,Higher angular momentum pairings in interorbital shadowed-triplet superconductors: Application to Sr$_{2}$RuO$_{4}$,"Even-parity interorbital spin-triplet pairing emerges as an intriguing
+candidate in multiorbital superconductors with significant Hund's and
+spin-orbit coupling. Within such a state, the pairing is dominated by the
+intraband pseudospin-singlet component via the spin-orbit coupling,
+distinguishing it from a pure spin triplet and motivating the name, shadowed
+triplet. With atomic spin-orbit coupling, it was shown that this pairing
+exhibits an anisotropic $s$-wave character, while higher angular momentum
+pairing symmetries such as $d$- or $g$-wave have been proposed based on
+phenomenological analyses in candidate systems. A natural question is then
+whether higher angular momentum pairings may arise with this form of
+spin-triplet pairing. Here, we examine the interplay between spin-orbit
+coupling and the electronic dispersions in correlated metals and demonstrate
+how they can be realized. We apply this idea to Sr$_{2}$RuO$_{4}$ and determine
+the competition among different pairing states as multiple spin-orbit coupling
+parameters are tuned. The presence of both $d$- and $g$-wave pairings,
+including a $d+ig$ state, are found when momentum-dependent spin-orbit coupling
+with $d$-wave character is increased. Implications of the theory and future
+directions are also discussed.",2107.00047v2
+2011-12-14,Coupled spin and valley physics in monolayers of MoS2 and other group-VI dichalcogenides,"We show that inversion symmetry breaking together with spin-orbit coupling
+leads to coupled spin and valley physics in monolayers of MoS2 and other
+group-VI dichalcogenides, making possible controls of spin and valley in these
+2D materials. The spin-valley coupling at the valence band edges suppresses
+spin and valley relaxation, as flip of each index alone is forbidden by the
+valley contrasting spin splitting. Valley Hall and spin Hall effects coexist in
+both electron-doped and hole-doped systems. Optical interband transitions have
+frequency-dependent polarization selection rules which allow selective
+photoexcitation of carriers with various combination of valley and spin
+indices. Photo-induced spin Hall and valley Hall effects can generate long
+lived spin and valley accumulations on sample boundaries. The physics discussed
+here provides a route towards the integration of valleytronics and spintronics
+in multi-valley materials with strong spin-orbit coupling and inversion
+symmetry breaking.",1112.3144v3
+2012-11-26,Coupled Spin-Orbital Texture in a Prototypical Topological Insulator,"One of the most important properties of topological insulators (TIs) is the
+helical spin texture of the Dirac surface states, which has been theoretically
+and experimentally argued to be left-handed helical above the Dirac point and
+right handed helical below. However, since the spin is not a good quantum
+number in these strongly spin-orbit coupled systems, this can not be a complete
+statement, and we must consider the total angular momentum J = L + S that is a
+contribution of the spin and orbital terms. Using a combination of orbital and
+spin-resolved angle-resolved photoemission spectroscopy (ARPES), we show a
+direct link between the different orbital and spin components, with a
+""backwards"" spin texture directly observed for the in-plane orbital states of
+Bi2Se3.",1211.5998v1
+2005-03-11,Ferromagnetic fluctuation and superconductivity in Na_0.35CoO_2*1.3H_2O: FLEX study of multi-orbital Hubbard model,"Spin and charge fluctuations and superconductivity in Na_0.35CoO_2*1.3H_2O
+are studied based on a multi-orbital Hubbard model. By applying the fluctuation
+exchange (FLEX) approximation, we show that the Hund's-rule coupling between
+the Co t2g orbitals causes ferromagnetic spin fluctuation. Triplet pairing is
+favored by this ferromagnetic fluctuation on the hole-pocket band. We propose
+that, in Na_0.35CoO_2*1.3H_2O, Co t2g orbitals and inter-orbital Hund's-rule
+coupling play important roles on the triplet pairing, and this compound can be
+a first example of the triplet superconductor mediated by
+inter-orbital-interaction-induced ferromagnetic fluctuation.",0503262v1
+2016-06-02,"First-principles studies of orbital and spin-orbit properties of GaAs, GaSb, InAs, and InSb zinc-blende and wurtzite semiconductors","We employ first-principles techniques tailored to properly describe
+semiconductors (modified Becke-Johnson potential added to the
+exchange-correlation functional), to obtain the electronic band structures of
+both the zinc-blende and wurtzite phases of GaAs, GaSb, InAs, and InSb. We
+extract the spin-orbit fields for the relevant valence and conduction bands at
+zone center, by fitting the spin-splittings resulting from the lack of space
+inversion symmetry of these bulk crystal structures, to known functional
+forms---third-order polynomials. We also determine the orientations of the
+spin-orbit vector fields (for conduction bands) and the average spins (valence
+bands) in the momentum space. We describe the dependence of the spin-orbit
+parameters on the cation and anion atomic weights. These results should be
+useful for spin transport, spin relaxation, and spin optical orientation
+modeling of semiconductor heterostructures, as well as for realistic studies of
+semiconductor-based Majorana nanowires, for which accurate values of spin-orbit
+couplings are needed.",1606.00588v1
+2016-05-10,A long-lived spin-orbit-coupled degenerate dipolar Fermi gas,"We describe the creation of a long-lived spin-orbit-coupled gas of quantum
+degenerate atoms using the most magnetic fermionic element, dysprosium.
+Spin-orbit-coupling arises from a synthetic gauge field created by the
+adiabatic following of degenerate dressed states comprised of optically coupled
+components of an atomic spin. Because of dysprosium's large electronic orbital
+angular momentum and large magnetic moment, the lifetime of the gas is limited
+not by spontaneous emission from the light-matter coupling, as for gases of
+alkali-metal atoms, but by dipolar relaxation of the spin. This relaxation is
+suppressed at large magnetic fields due to Fermi statistics. We observe
+lifetimes up to 400 ms, which exceeds that of spin-orbit-coupled fermionic
+alkali atoms by a factor of 10-100, and is close to the value obtained from a
+theoretical model. Elastic dipolar interactions are also observed to influence
+the Rabi evolution of the spin, revealing an interacting fermionic system. The
+long lifetime of this weakly interacting spin-orbit-coupled degenerate Fermi
+gas will facilitate the study of quantum many-body phenomena manifest at longer
+timescales, with exciting implications for the exploration of exotic
+topological quantum liquids.",1605.03211v2
+2013-02-22,Controlling hole spins in quantum dots and wells,"We review recent theoretical results for hole spins influenced by spin-orbit
+coupling and Coulomb interaction in two-dimensional quantum wells as well as
+the decoherence of single hole spins in quantum dots due to hyperfine
+interaction with surrounding nuclear spins. After reviewing the different forms
+of spin-orbit coupling that are relevant for electrons and heavy holes in III-V
+semiconductor quantum wells, we illustrate the combined effect of spin-orbit
+coupling and Coulomb interactions for hole systems on spin-dependent
+quasiparticle group velocities. We further analyze spin-echo decay for a single
+hole spin in a nuclear-spin bath, demonstrating that this decoherence source
+can be controlled in these systems by entering a motional-averaging regime.
+Throughout this review, we emphasize physical effects that are unique to hole
+spins (rather than electrons) in nanoscale systems.",1302.5470v2
+2009-10-06,Diffusive and precessional spin dynamics in a two-dimensional electron gas with disorder: a gauge theory view,"We develop a gauge theory for diffusive and precessional spin dynamics in
+two-dimensional electron gas with disorder. Our approach reveals a direct
+connections between the absence of the equilibrium spin current and strong
+anisotropy in the spin relaxation: both effects arise if the spin-orbit
+coupling is reduced to a pure gauge SU(2) field. In this case, by a gauge
+transformation in the form of a local SU(2) rotation in the spin subspace the
+spin-orbit coupling can be removed. The resulting spin dynamics is exactly
+described in terms of two kinetic coefficients: the spin diffusion and electron
+mobility. After the inverse transformation, full diffusive and precessional
+spin density dynamics, including the anisotropic spin relaxation, formation of
+stable spin structures, and spin precession induced by a macroscopic current,
+is restored. Explicit solutions of the spin evolution equations are found for
+the initially uniform spin density and for stable nonuniform structures. Our
+analysis demonstrates a universal relation between the spin relaxation rate and
+spin diffusion coefficient.",0910.0951v2
+2009-04-17,Spin Relaxation in Isotopically Purified Silicon Quantum Dots,"We investigate spin-flip processes of Si quantum dots due to spin-orbit
+coupling. We utilize the spin-orbit coupling constants related to bulk and
+structure inversion asymmetry obtained numerically for two dimensional
+heterostructures. We find that the spin-flip rate is very sensitive to these
+coupling constants. We investigate the nuclei-mediated spin-flip process and
+find the level of the isotope $^{29}$Si concentration for which this mechanism
+become dominant.",0904.2592v1
+2015-12-16,Spin orbit coupling at the level of a single electron,"We utilize electron counting techniques to distinguish a spin conserving fast
+tunneling process and a slower process involving spin flips in
+AlGaAs/GaAs-based double quantum dots. By studying the dependence of the rates
+on the interdot tunnel coupling of the two dots, we find that as many as 4% of
+the tunneling events occur with a spin flip related to spin-orbit coupling in
+GaAs. Our measurement has a fidelity of 99 % in terms of resolving whether a
+tunneling event occurred with a spin flip or not.",1512.05149v1
+2014-07-08,Spin Orbit Coupling in Periodically Driven Optical Lattices,"We propose a method for the emulation of artificial spin orbit coupling in a
+system of ultracold, neutral atoms trapped in a tight-binding lattice. This
+scheme does not involve near-resonant laser fields, avoiding the heating
+processes connected to the spontaneous emission of photons. In our case, the
+necessary spin dependent tunnel matrix elements are generated by a rapid, spin
+dependent, periodic force, which can be described in the framework of an
+effective, time averaged Hamiltonian. An additional radio frequency coupling
+between the spin states leads to a mixing of the spin bands.",1407.1953v2
+2008-06-10,"Spin-orbit effects in Na$_4$Ir$_3$O$_8$, a hyper-kagomé lattice antiferromagnet","We consider spin-orbit coupling effects in Na$_4$Ir$_3$O$_8$, a material in
+which Ir$^{4+}$ spins form an hyper-kagom\'{e} lattice, a three-dimensional
+network of corner-sharing triangles. We argue that both low temperature
+thermodynamic measurements and the impurity susceptibility induced by dilute
+substitution of Ti for Ir are suggestive of significant spin-orbit effects.
+Because of uncertainties in the crystal-field parameters, we consider two
+limits in which the spin-orbit coupling is either weak or strong compared to
+the non-cubic atomic splittings. A semi-microscopic calculation of the exchange
+Hamiltonian confirms that indeed large antisymmetric Dzyaloshinskii-Moriya (DM)
+and/or symmetric exchange anisotropy may be present. In the strong spin-orbit
+limit, the Ir-O-Ir superexchange contribution consists of unfrustrated strong
+symmetric exchange anisotropy, and we suggest that spin-liquid behavior is
+unlikely. In the weak spin-orbit limit, and for strong spin-orbit and direct
+Ir-Ir exchange, the Hamiltonian consists of Heisenberg and DM interactions. The
+DM coupling is parametrized by a three component DM vector (which must be
+determined empirically). For a range of orientation of this vector, frustration
+is relieved and an ordered state occurs. For other orientations, even the
+classical ground states are very complex. We perform spin-wave and exact
+diagonalization calculations which suggest the persistence of a quantum spin
+liquid in the latter regime. Applications to Na$_4$Ir$_3$O$_8$ and broader
+implications are discussed.",0806.1573v3
+2010-10-23,Robust to impurity-scattering spin Hall effect in two-dimensional electron gas,"We propose a mechanism of spin Hall effect in two-dimensional electron gas
+with spatially random Rashba spin-orbit interaction. The calculations based on
+the Kubo formalism and kinetic equation show that in contrast to the constant
+spin-orbit coupling, spin Hall conductivity in the random spin-orbit field is
+not totally suppressed by the potential impurity scattering. Even if the
+regular contribution is removed by the vertex corrections, the terms we
+consider, remain. Therefore, the intrinsic spin-Hall effect exists being,
+however, non-universal.",1010.4900v1
+2010-12-22,Non-adiabatic generation of a pure spin current in a 1D quantum ring with spin-orbit interaction,"We demonstrate the theoretical possibility of obtaining a pure spin current
+in a 1D ring with spin-orbit interaction by irradiation with a non-adiabatic,
+two-component terahertz laser pulse, whose spatial asymmetry is reflected by an
+internal dephasing angle $\phi$. The stationary solutions of the equation of
+motion for the density operator are obtained for a spin-orbit coupling linear
+in the electron momentum (Rashba) and used to calculate the time-dependent
+charge and spin currents. We find that there are critical values of $\phi$ at
+which the charge current disappears, while the spin current reaches a maximum
+or a minimum value.",1012.4952v1
+2016-11-29,Spin-sensitive atom mirror via spin-orbit interaction,"Based on the spin-orbit coupling recently implemented in a neutral cold-atom
+gas, we propose a scheme to realize spin-dependent scattering of cold atoms. In
+particular we consider a matter wave packet of cold-atom gas impinging upon a
+step potential created by the optical light field, inside of which the atoms
+are subject to spin-orbit interaction. We show that the proposed system can act
+as a spin polarizer or spin-selective atom mirror for the incident atomic beam.
+The principle and the operating parameter regime of the system are carefully
+discussed.",1611.09617v1
+2014-01-29,Josephson physics of spin-orbit coupled elongated Bose-Einstein condensates,"We consider an ultracold bosonic binary mixture confined in a one-dimensional
+double-well trap. The two bosonic components are assumed to be two hyperfine
+internal states of the same atom. We suppose that these two components are
+spin-orbit coupled between each other. We employ the two-mode approximation
+starting from two coupled Gross-Pitaevskii equations and derive a system of
+ordinary differential equations governing the temporal evolution of the
+inter-well population imbalance of each component and that between the two
+bosonic species. We study the Josephson oscillations of these spin-orbit
+coupled Bose-Einstein condensates by analyzing the interplay between the
+interatomic interactions and the spin-orbit coupling and the self-trapped
+dynamics of the inter-species imbalance. We show that the dynamics of this
+latter variable is crucially determined by the relationship between the
+spin-orbit coupling, the tunneling energy, and the interactions.",1401.7693v1
+2012-02-07,BCS-BEC crossover in three-dimensional Fermi gases with spherical spin-orbit coupling,"We present a systematic theoretical study of the BCS-BEC crossover problem in
+three-dimensional atomic Fermi gases at zero temperature with a spherical
+spin-orbit coupling which can be generated by a synthetic non-Abelian gauge
+field coupled to neutral fermions. Our investigations are based on the path
+integral formalism which is a powerful theoretical scheme for the study of the
+properties of the bound state, the superfluid ground state, and the collective
+excitations in the BCS-BEC crossover. At large spin-orbit coupling, the system
+enters the BEC state of a novel type of bound state (referred to as rashbon)
+which possesses a non-trivial effective mass. Analytical results and
+interesting universal behaviors for various physical quantities at large
+spin-orbit coupling are obtained. Our theoretical predictions can be tested in
+future experiments of cold Fermi gases with three-dimensional spherical
+spin-orbit coupling.",1202.1492v3
+2012-10-22,Fate of a Bose-Einstein Condensate in the Presence of Spin-Orbit Coupling,"Intensive theoretical studies have recently predicted that a Bose-Einstein
+condensate will exhibit a variety of novel properties if spin-orbit coupling is
+present. However, an unambiguous fact has also been pointed out: Rashba
+coupling destroys a condensate of noninteracting bosons even in high
+dimensions. Therefore, a conceptually important question arises as to whether
+or not a condensate exists in the presence of interaction and a general type of
+spin-orbit coupling. Here we show that interaction qualitatively changes the
+ground state of bosons under Rashba spin-orbit coupling. Any infinitesimal
+repulsion forces bosons either to condense at one or two momentum states or to
+form a superfragmented state that is a superposition of infinite numbers of
+fragmented condensates. The superfragmented state is unstable against the
+anisotropy of spin-orbit coupling in systems with large numbers of particles,
+leading to the revival of a condensate in current experiments.",1210.5853v2
+2021-06-04,Spin-orbit coupling effects over thermoelectric transport properties in quantum dots,"We study the effects caused by Rashba and Dresselhaus spin-orbit coupling
+over the thermoelectric transport properties of a single-electron transistor,
+viz., a quantum dot connected to one-dimensional leads. Using linear response
+theory and employing the numerical renormalization group method, we calculate
+the thermopower, electrical and thermal conductances, dimensionless
+thermoelectric figure of merit, and study the Wiedemann-Franz law, showing
+their temperature maps. Our results for all those properties indicate that
+spin-orbit coupling drives the system into the Kondo regime. We show that the
+thermoelectric transport properties, in the presence of spin-orbit coupling,
+obey the expected universality of the Kondo strong coupling fixed point. In
+addition, our results show a notable increase in the thermoelectric figure of
+merit, caused by the spin-orbit coupling in the one-dimensional quantum dot
+leads.",2106.02184v1
+2022-01-21,Superconductivity in Correlated Multi-Orbital Systems with Spin-Orbit Coupling: Coexistence of Even- and Odd-Frequency Pairing and the Case of Strontium Ruthenate,"The superconducting order parameter of strontium ruthenate is the center of a
+lasting puzzle calling for theoretical studies that include the
+seldom-considered effects of spin-orbit coupling and the frequency-dependence
+of the order parameters. Here we generalize the frequency-dependent theory of
+superconductivity mediated by spin and charge fluctuations to include
+spin-orbit coupling in multi-orbital systems and we characterize the
+superconducting states using the spin-parity-orbital-time $SPOT$ quantum
+numbers, group theory, and phase distributions in the complex plane. We derive
+a pseudospin formulation that maps the inter-pseudospin sector of the normal
+state Eliashberg equation to a pseudospin-diagonal one. Possible
+superconducting order parameters for strontium ruthenate are obtained starting
+from a realistic density-functional-theory normal state. We find that
+spin-orbit coupling leads to ubiquitous entanglement of spin and orbital
+quantum numbers, along with notable mixing between even- and odd-frequency
+correlations. We propose a phase diagram obtained from the temperature
+dependence of the leading and subleading symmetries in the pseudospin-orbital
+basis. An accidental degeneracy between leading inter-pseudospin symmetries in
+strontium ruthenate, B$_{1g}^+$ and A$_{2g}^-$, could resolve apparent
+experimental contradictions.",2201.08918v3
+2021-08-23,Large spin-charge interconversion induced by interfacial spin-orbit coupling at a highly conducting all-metallic system,"Spin-charge interconversion in systems with spin-orbit coupling has provided
+a new route for the generation and detection of spin currents in functional
+devices for memory and logic such as spin-orbit torque switching in magnetic
+memories or magnetic state reading in spin-based logic. Disentangling the bulk
+(spin Hall effect) from the interfacial (inverse spin galvanic effect)
+contribution has been a common issue to properly quantify the spin-charge
+interconversion in these systems, being the case of Au paradigmatic. Here, we
+obtain a large spin-charge interconversion at a highly conducting Au/Cu
+interface which is experimentally shown to arise from the inverse spin galvanic
+effect of the interface and not from the spin Hall effect of bulk Au. We use
+two parameters independent of the microscopic details to properly quantify the
+spin-charge interconversion and the spin losses due to the interfacial
+spin-orbit coupling, providing an adequate benchmarking to compare with any
+spin-charge interconversion system. The good performance of this metallic
+interface, not based in Bi, opens the path to the use of much simpler
+light/heavy metal systems.",2108.10409v1
+2006-01-20,Conserved Spin and Orbital Angular Momentum Hall Current in a Two-Dimensional Electron System with Rashba and Dresselhaus Spin-orbit Coupling,"We study theoretically the spin and orbital angular momentum (OAM) Hall
+effect in a high mobility two-dimensional electron system with Rashba and
+Dresselhuas spin-orbit coupling by introducing both the spin and OAM torque
+corrections, respectively, to the spin and OAM currents. We find that when both
+bands are occupied, the spin Hall conductivity is still a constant (i.e.,
+independent of the carrier density) which, however, has an opposite sign to the
+previous value. The spin Hall conductivity in general would not be cancelled by
+the OAM Hall conductivity. The OAM Hall conductivity is also independent of the
+carrier density but depends on the strength ratio of the Rashba to Dresselhaus
+spin-orbit coupling, suggesting that one can manipulate the total Hall current
+through tuning the Rashba coupling by a gate voltage. We note that in a pure
+Rashba system, though the spin Hall conductivity is exactly cancelled by the
+OAM Hall conductivity due to the angular momentum conservation, the spin Hall
+effect could still manifest itself as nonzero magnetization Hall current and
+finite magnetization at the sample edges because the magnetic dipole moment
+associated with the spin of an electron is twice as large as that of the OAM.
+We also evaluate the electric field-induced OAM and discuss the origin of the
+OAM Hall current. Finally, we find that the spin and OAM Hall conductivities
+are closely related to the Berry vector (or gauge) potential.",0601466v2
+2019-07-11,Spin-orbit coupling in elemental two-dimensional materials,"The fundamental spin-orbit coupling and spin mixing in graphene and rippled
+honeycomb lattice materials silicene, germanene, stanene, blue phosphorene,
+arsenene, antimonene, and bismuthene is investigated from first principles. The
+intrinsic spin-orbit coupling in graphene is revisited using multi-band $k\cdot
+p$ theory, showing the presence of non-zero spin mixing in graphene despite the
+mirror symmetry. However, the spin mixing itself does not lead to the the
+Elliott-Yafet spin relaxation mechanism, unless the mirror symmetry is broken
+by external factors. For other aforementioned elemental materials we present
+the spin-orbit splittings at relevant symmetry points, as well as the spin
+admixture $b^2$ as a function of energy close to the band extrema or Fermi
+levels. We find that spin-orbit coupling scales as the square of the atomic
+number Z, as expected for valence electrons in atoms. For isolated bands, it is
+found that $b^2\sim Z^4$. The spin-mixing parameter also exhibits giant
+anisotropy which, to a large extent, can be controlled by tuning the Fermi
+level. Our results for $b^2$ can be directly transferred to spin relaxation
+time due to the Elliott-Yafet mechanism, and therefore provide an estimate of
+the upper limit for spin lifetimes in materials with space inversion center.",1907.05152v1
+2016-10-24,Prototypical topological orbital ferromagnet $γ$-FeMn,"We predict from first principles an entirely topological orbital
+magnetization in the noncoplanar bulk antiferromagnet $\gamma$-FeMn originating
+in the nontrivial topology of the underlying spin structure, without any
+reference to spin-orbit interaction. Studying the influence of strain,
+composition ratio, and spin texture on the topological orbital magnetization
+and the accompanying topological Hall effect, we promote the scalar spin
+chirality as key mechanism lifting the orbital degeneracy. The system is thus a
+prototypical topological orbital ferromagnet, the macroscopic orbital
+magnetization of which is prominent even without spin-orbit coupling. One of
+the remarkable features of $\gamma$-FeMn is the possibility for pronounced
+orbital magnetostriction mediated by the complex spin topology in real space.",1610.07573v1
+1997-12-15,Pressure Effects in Manganites with Layered Perovskite Structure,"Pressure effects on the charge and spin dynamics in the bilayer manganite
+compounds $La_{2-2x}Sr_{1+2x}Mn_2O_7$ are studied theoretically by taking into
+account the orbital degrees of freedom. The orbital degrees are active in the
+layered crystal structure, and applied hydrostatic pressure stabilizes the
+$3d_{x^2-y^2}$ orbital in comparison with $3d_{3z^2-r^2}$. The change of the
+orbital states weakens the interlayer charge and spin couplings, and suppresses
+the three dimensional ferromagnetic transition. Numerical results, based on an
+effective Hamiltonian which includes the energy level difference of the
+orbitals, show that the applied pressure controls the dimensionality of the
+spin and charge dynamics through changes of the orbital states.",9712162v1
+2000-10-14,"Mean-Field Approach to Charge, Orbital, and Spin Ordering in Manganites","We present a mean-field theory of charge, orbital, and spin ordering in
+manganites at 50% and 0% dopings by considering Jahn-Teller interaction,
+nearest-neighbor repulsion, and no single-site double occupancy. For spinless
+fermions, we show that Jahn-Teller distortion and charge-orbital ordering occur
+simultaneously. In our two-dimensional model at 50% doping, for small
+nearest-neighbor repulsion the system is orbitally polarized while for larger
+repulsion the system undergoes CE type ordering. As for the 0% doping case, the
+ground state is orbitally antiferromagnetic. Upon including spin degree of
+freedom, at both 50% and 0% dopings the ordering remains the same at small
+antiferromagnetic coupling between adjacent core spins.",0010197v1
+2018-12-04,Anomalous orbital moment in the ferromagnetic phase of the Sr4Ru3O10,"The coupling of spin and orbital degrees of freedom in the trilayer Sr4Ru3O10
+sets a long-standing puzzle, due to the peculiar anisotropic coexistence of
+out-of-plane ferromagnetism and in-plane metamagnetism. Recently, the induced
+magnetic structure by in-plane applied fields has been investigated by means of
+spin-polarized neutron diffraction, which allowed to extract a substantial
+orbital component of the magnetic densities at Ru sites. It has been argued
+that the latter is at the origin of the evident layer dependent magnetic
+anisotropy, where the inner layers carry larger magnetic moments than the outer
+ones. We present a spin-polarized neutron diffraction study in order to
+characterize the nature of the ferromagnetic state of Sr4Ru3O10, in the
+presence of a magnetic field applied along the c-axis. The components of the
+magnetic densities at the Ru sites reveal a vanishing contribution of the
+orbital magnetic moment which is unexpected for a material system where orbital
+and spin degeneracy are lifted by spin-orbit coupling and ferromagnetism. We
+employ a model that includes the Coulomb interaction and spin-orbit coupling at
+the Ru site to address the origin of the suppression of the orbital magnetic
+moment. The emerging scenario is that of non-local orbital degrees of freedom
+playing a significant role in the ferromagnetic phase, with the Coulomb
+interaction that is crucial to make anti-aligned orbital moments at short
+distance resulting in a ground state with vanishing local orbital moments.",1812.01359v2
+2001-08-08,Ordered valence bond states in symmetric two-dimensional spin-orbital systems,"We consider a superexchange Hamiltonian, $H=-\sum_{<i,j>}(2{\bf S}_i\cdot
+{\bf S}_j-\frac 12)(2{\bf T}_i\cdot {\bf T}_j-\frac 12)$, which describes
+systems with orbital degeneracy and strong electron-phonon coupling in the
+limit of large on-site repulsion. In an SU(4) Schwinger boson representation, a
+reduced spin-orbital interaction is derived {\it exactly}, and a mean field
+theory has been developed by introducing a symmetric valence bond pairing order
+parameter. In one dimension, a spin-orbital liquid state with a finite gap is
+obtained. On a two-dimensional square lattice a novel type of spin-orbital
+ferromagnetically ordered state appears, while spin and orbital are
+antiferromagnetic. Moreover, an important relation has been found, relating the
+spin and orbital correlation functions to the combined spin-orbital ones.",0108134v1
+2009-07-09,Excitation spectrum and magnetic field effects in a quantum critical spin-orbital system:FeSc$_2$S$_4$,"The orbitally degenerate A-site spinel compound FeSc2S4 has been
+experimentally identified as a ``spin-orbital liquid'', with strong
+fluctuations of both spins and orbitals. Assuming that the second neighbor spin
+exchange J2 is the dominant one, we argued in a recent theoretical study [Chen
+et al., Phys. Rev. Lett. 102, 096406 (2009)] that FeSc2S4 is in a local
+``spin-orbital singlet'' state driven by spin orbit coupling, close to a
+quantum critical point, which separates the ``spin-orbital singlet'' phase from
+a magnetically and orbitally ordered phase. In this paper, we refine further
+and develop this theory of FeSc2S4 . First, we show that inclusion of a small
+first neighbor exchange J1 induces a narrow region of incommensurate phase near
+the quantum critical point. Next, we derive the phase diagram in the presence
+of an external magnetic field B, and show that the latter suppresses the
+ordered phase. Lastly, we compute the field dependent dynamical magnetic
+susceptibility $\chi(k, \omega; B)$, from which we extract a variety of
+physical quantities. Comparison with and suggestions for experiment are
+discussed.",0907.1692v1
+2009-07-17,Model for frustrated spin-orbital chains: application to CaV2O4,"Motivated by recent interest in quasi-one-dimensional compound CaV2O4, we
+study the ground states of a spin-orbital chain characterized by an Ising-like
+orbital Hamiltonian and frustrated interactions between S=1 spins. The on-site
+spin-orbit interaction and Jahn-Teller effect compete with inter-site
+superexchange leading to a rich phase diagram in which an antiferro-orbital
+phase is separated from the orbital paramagnet by a continuous Ising
+transition. Two distinct spin liquids depending on the underlying orbital order
+are found in the limit of small spin-orbit coupling. In the opposite limit, the
+zigzag chain behaves as a spin-2 chain with Ising anisotropy. The implications
+for CaV2O4 are discussed.",0907.3006v2
+2012-05-29,Exact spin-orbital separation in a solvable model in one dimension,"A one-dimensional model of coupled spin-1/2 spins and pseudospin-1/2 orbitals
+with nearest-neighbor interaction is rigorously shown to exhibit spin-orbital
+separation by means of a non-local unitary transformation. On an open chain,
+this transformation completely decouples the spins from the orbitals in such a
+way that the spins become paramagnetic while the orbitals form the soluble XXZ
+Heisenberg model. The nature of various correlations is discussed. The more
+general cases, which allow spin-orbital separation by the same method, are
+pointed out. A generalization for the orbital pseudospin greater than 1/2 is
+also discussed. Some qualitative connections are drawn with the recently
+observed spin-orbital separation in Sr2CuO3.",1205.6436v3
+2020-04-01,Large spin-Hall effect in Si at room temperature,"Silicon's weak intrinsic spin-orbit coupling and centrosymmetric crystal
+structure are a critical bottleneck to the development of Si spintronics,
+because they lead to an insignificant spin-Hall effect (spin current
+generation) and inverse spin-Hall effect (spin current detection). Here, we
+undertake current, magnetic field, crystallography dependent magnetoresistance
+and magneto thermal transport measurements to study the spin transport behavior
+in freestanding Si thin films. We observe a large spin-Hall magnetoresistance
+in both p-Si and n-Si at room temperature and it is an order of magnitude
+larger than that of Pt. One explanation of the unexpectedly large and efficient
+spin-Hall effect is spin-phonon coupling instead of spin-orbit coupling. The
+macroscopic origin of the spin-phonon coupling can be large strain gradients
+that can exist in the freestanding Si films. This discovery in a light, earth
+abundant and centrosymmetric material opens a new path of strain engineering to
+achieve spin dependent properties in technologically highly-developed
+materials.",2004.00665v1
+2022-12-14,Spin singlet topological superconductivity in the attractive Rashba Hubbard model,"Fully gapped, spin singlet superconductors with antisymmetric spin-orbit
+coupling in a Zeeman magnetic field provide a promising route to realize
+superconducting states with non-Abelian topological order and therefore
+fault-tolerant quantum computation. Here we use a quantum Monte Carlo dynamical
+cluster approximation to study the superconducting properties of a doped
+two-dimensional attractive Hubbard model with Rashba spin-orbit coupling in a
+Zeeman magnetic field. We generally find that the Rashba coupling has a
+beneficial effect towards s-wave superconductivity. In the presence of a finite
+Zeeman field, when superconductivity is suppressed by Pauli pair-breaking, the
+Rashba coupling counteracts the spin imbalance created by the Zeeman field by
+mixing the spins, and thus restores superconductivity at finite temperatures.
+We show that this favorable effect of the spin-orbit coupling is traced to a
+spin-flip driven enhancement of the amplitude for the propagation of a pair of
+electrons in time-reversed states. Moreover, by inspecting the Fermi surface of
+the interacting model, we show that for sufficiently large Rashba coupling and
+Zeeman field, the superconducting state is expected to be topologically
+non-trivial.",2212.07251v1
+2022-04-22,Controlling magnetism with light in a zero orbital angular momentum antiferromagnet,"Antiferromagnetic materials feature intrinsic ultrafast spin dynamics, making
+them ideal candidates for future magnonic devices operating at THz frequencies.
+A major focus of current research is the investigation of optical methods for
+the efficient generation of coherent magnons in antiferromagnetic insulators.
+In magnetic lattices endowed with orbital angular momentum, spin-orbit coupling
+enables spin dynamics through the resonant excitation of low-energy electric
+dipoles such as phonons and orbital resonances which interact with spins.
+However, in magnetic systems with zero orbital angular momentum, microscopic
+pathways for the resonant and low-energy optical excitation of coherent spin
+dynamics are lacking. Here, we consider experimentally the relative merits of
+electronic and vibrational excitations for the optical control of zero orbital
+angular momentum magnets, focusing on a limit case: the antiferromagnet
+manganese thiophoshate (MnPS3), constituted by orbital singlet Mn2+ ions. We
+study the correlation of spins with two types of excitations within its band
+gap: a bound electron orbital excitation from the singlet orbital ground state
+of Mn2+ into an orbital triplet state, which causes coherent spin precession,
+and a vibrational excitation of the crystal field that causes thermal spin
+disorder. Our findings cast orbital transitions as key targets for magnetic
+control in insulators constituted by magnetic centers of zero orbital angular
+momentum.",2204.10574v1
+2011-03-31,Emergent patterns in a spin-orbit coupled spin-2 Bose-Einstein condensate,"The ground-state phases of a spin-orbit (SO) coupled atomic spin-2
+Bose-Einstein condensate (BEC) are studied. Interesting density patterns
+spontaneously formed are widespread due to the competition between SO coupling
+and spin-dependent interactions like in a SO coupled spin-1 condensate. Unlike
+the case of spin-1 condensates, which are characterized by either ferromagnetic
+or polar phase in the absence of SO, spin-2 condensates can take a cyclic
+phase, where we find the patterns formed due to SO are square or triangular in
+their spin component densities for axial symmetric SO interaction. Both
+patterns are found to continuously evolve into striped forms with increased
+asymmetry of the SO coupling.",1103.6074v1
+2003-10-03,Spin-Spin and Spin-Orbit Interactions in Strongly Coupled Gauge Theories,"We evaluate the spin-orbit and spin-spin interaction between two fermions in
+strongly coupled gauge theories in their Coulomb phase. We use the
+quasi-instantaneous character of Coulomb's law at strong coupling to resum a
+class of ladder diagrams. For ${\cal N}=4$ SYM we derive both weak and strong
+coupling limits of the the spin-orbit and spin-spin interactions, and find that
+in the latter case these interactions are subleading corrections and do not
+seriously affect the deeply bound Coulomb states with large angular momentum,
+pointed out in our previous paper. The results are important for understanding
+of the regime of intermediate coupling, which is the case for QCD somewhat
+above the chiral transition temperature.",0310031v1
+2007-09-04,"On the Bohr radius relationship to spin-orbit interaction, spin magnitude, and Thomas precession","The dynamics of the spin-orbit interaction in atomic hydrogen are studied in
+a classical electrodynamics-like setting. A Rutherfordian atomic model is used
+assuming a circular electron orbit, without the quantum principle as imposed
+arbitrarily in the Bohr model, but with an ad hoc incorporation in the electron
+of intrinsic spin and associated magnetic dipole moment. Analyzing the motions
+of the electron spin and orbital angular momenta, it is found that in the
+presence of Thomas precession, the total angular momentum averaged over the
+orbit is not generally a constant of the motion. It is noted this differs from
+the finding of Thomas in a similar assessment of 1927, and the reason for this
+difference is provided. It is found that although the total orbit-averaged
+angular momentum is not a constant of the motion, it precesses around a fixed
+axis similarly to the precession of the total angular momentum vector seen in
+spin-orbit coupling in quantum theory. The magnitude of the angular velocity of
+the total orbit-averaged angular momentum is seen to vanish only when the spin
+and orbital angular momenta are antiparallel and their mutual precession
+frequencies equate. It is then found, there is a unique radius where the mutual
+precession frequencies equate. Assuming the electron magnetic moment is the
+Bohr magneton, and an electron g-factor of two, this radius corresponds to
+where the orbital angular momentum is the reduced Planck's constant. The orbit
+radius for stationary total angular momentum for the circular orbit model with
+nonzero orbital angular momentum is thus the ground-state radius of the Bohr
+model.",0709.0319v4
+2018-04-26,Topological zero-line mode of bilayer graphene with Rashba spin-orbital coupling and staggered sublattice potentials,"Domain wall in bilayer graphene with Rashba spin-orbital coupling and
+staggered sublattice potentials, at the interface between two domains with
+different gated voltages, is studied. Varying type of zero-line modes are
+identified, including zero-line mode with pure spin filtering effect. The
+Y-shape current partition at the junction among three different domains are
+proposed.",1804.09881v2
+2011-06-22,Integrable relativistic systems given by Hamiltonians with momentum-spin-orbit coupling,"In the paper we investigate the evolution of the relativistic particle
+(massive and massless) with spin defined by Hamiltonian containing the terms
+with momentum-spin-orbit coupling. We integrate the corresponding Hamiltonian
+equations in quadratures and express their solutions in terms of elliptic
+functions.",1106.4480v1
+2011-12-12,Spontaneous generation of spin-orbit coupling in magnetic dipolar Fermi gases,"The stability of an unpolarized two-component dipolar Fermi gas is studied
+within mean-field theory. Besides the known instability towards spontaneous
+magnetization with Fermi sphere deformation, another instability towards
+spontaneous formation of a spin-orbit coupled phase with a Rashba-like spin
+texture is found. A phase diagram is presented and consequences are briefly
+discussed.",1112.2596v1
+2017-02-15,Optimal dense coding and swap operation between two coupled electronic spins: effects of nuclear field and spin-orbit interaction,"The effects of nuclear field and spin-orbit interaction on dense coding and
+swap operation are studied in detail for both the antiferromagnetic (AFM) and
+ferromagnetic (FM) coupling cases. The conditions for a valid dense coding and
+under which swap operation is feasible are given.",1702.04454v1
+2005-12-22,Bulk electron spin polarization generated by the spin Hall current,"It is shown that the spin Hall current generates a non-equilibrium spin
+polarization in the interior of crystals with reduced symmetry in a way that is
+drastically different from the previously well-known equilibrium polarization
+during the spin relaxation process. The steady state spin polarization value
+does not depend on the strength of spin-orbit interaction offering possibility
+to generate relatively high spin polarization even in the case of weak
+spin-orbit coupling.",0512566v2
+2008-01-11,Phonon modulation of the spin-orbit interaction as a spin relaxation mechanism in quantum dots,"We calculate the spin relaxation rates in a parabolic InSb quantum dots due
+to the spin interaction with acoustical phonons. We considered the deformation
+potential mechanism as the dominant electron-phonon coupling in the
+Pavlov-Firsov spin-phonon Hamiltonian. By studying suitable choices of magnetic
+field and lateral dot size, we determine regions where the spin relaxation
+rates can be practically suppressed. We analyze the behavior of the spin
+relaxation rates as a function of an external magnetic field and mean quantum
+dot radius. Effects of the spin admixture due to Dresselhaus contribution to
+spin-orbit interaction are also discussed.",0801.1699v1
+2013-03-23,Spin-Orbit mediated spin relaxation in monolayer MoS2,"We study the intra-valley spin-orbit mediated spin relaxation in monolayers
+of MoS2 within a two bands effective Hamiltonian. The intrinsic spin splitting
+of the valence band as well as a Rashba-like coupling due to the breaking of
+the out-of-plane inversion symmetry are considered. We show that, in the hole
+doped regime, the out-of-plane spin relaxation is not very efficient since the
+spin splitting of the valence band tends to stabilize the spin polarization in
+this direction. We obtain spin lifetimes larger than nanoseconds, in agreement
+with recent valley polarization experiments.",1303.5860v2
+2021-09-30,Observation of the orbital Hall effect in a light metal Ti,"The orbital angular momentum is a core ingredient of orbital magnetism, spin
+Hall effect, giant Rashba spin splitting, orbital Edelstein effect, and
+spin-orbit torque. However, its experimental detection is tricky. In
+particular, direct detection of the orbital Hall effect remains elusive despite
+its importance for electrical control of magnetic nanodevices. Here we report
+the direct observation of the orbital Hall effect in a light metal Ti. The Kerr
+rotation by the accumulated orbital magnetic moment is measured at Ti surfaces,
+whose result agrees with theoretical calculations semiquantitatively and is
+supported by the orbital torque measurement in Ti-based magnetic
+heterostructures. The results confirm the electron orbital angular momentum as
+an essential dynamic degree of freedom, which may provide a novel mechanism for
+the electric control of magnetism. The results may also deepen the
+understanding of spin, valley, phonon, and magnon dynamics coupled with orbital
+dynamics.",2109.14847v1
+2022-09-19,Unidirectional orbital magnetoresistance in light metal/ferromagnet bilayers,"We report the observation of a unidirectional magnetoresistance (UMR) that
+originates from the nonequilibrium orbital momentum induced by an electric
+current in a naturally oxidized Cu/Co bilayer. The orbital-UMR scales with the
+torque efficiency due to the orbital Rashba-Edelstein effect upon changing the
+Co thickness and temperature, reflecting their common origin. We attribute the
+UMR to orbital-dependent electron scattering and orbital-to-spin conversion in
+the ferromagnetic layer. In contrast to the spin-current induced UMR, the
+magnon contribution to the orbital-UMR is absent in thin Co layers, which we
+ascribe to the lack of coupling between low energy magnons and orbital current.
+The magnon contribution to the UMR emerges in Co layers thicker than about 5
+nm, which is comparable to the orbital-to-spin conversion length. Our results
+provide insight into orbital-to-spin momentum transfer processes relevant for
+the optimization of spintronic devices based on light metals and orbital
+transport.",2209.09355v1
+2004-05-04,Transverse Electron Focusing in Systems with Spin-Orbit Coupling,"We study the transverse electron focusing in a two dimensional electron gas
+with Rashba spin-orbit coupling. We show that the interplay between the
+external magnetic field and the spin-orbit coupling gives two branches of
+states with different cyclotron radius within the same energy window. This
+effect generates a splitting of the first focusing peak in two contributions.
+Each one of these contributions is spin polarized. The surface reflection mixes
+the two branches and the second focusing peak does not present the same effect.
+While for GaAs/AlGaAs heterostructures the effect is small, in systems like
+InSb/InAlSb the effect should be clearly observed.",0405061v1
+2004-07-06,Theory of Edge States in Systems with Rashba Spin-Orbit Coupling,"We study the edge states in a two dimensional electron gas with a transverse
+magnetic field and Rashba spin-orbit coupling. In the bulk, the interplay
+between the external field perpendicular to the gas plane and the spin-orbit
+coupling leads to two branches of states that, within the same energy window,
+have different cyclotron radii. For the edge states, surface reflection
+generates hybrid states with the two cyclotron radii. We analyze the spectrum
+and spin structure of these states and present a semiclassical picture of them.",0407138v1
+2004-10-03,Spin-Orbit Effects in Diluted Magnetic Semiconductors,"We present a theoretical study of diluted magnetic semiconductors that treats
+the local sp-d exchange interaction J between the itinerant carriers and the Mn
+d electrons within a realistic band structure and goes beyond previous
+mean-field approaches. In case of (Ga,Mn)As, we find that strong exchange
+potentials tightly bind carriers near impurity sites. Spin-orbit coupling is
+found to have a more pronounced effect on spin polarization at weak coupling
+and this feature can be exploited for magnetotransport. For low doping regime,
+we predict that spin-orbit coupling splits impurity bands and can induce a
+novel insulating phase.",0410051v1
+2004-04-04,Spin-orbit coupling and magnetic spin states in cylindrical quantum dots,"We make detailed analysis of each possible spin-orbit coupling of zincblende
+narrow-gap cylindrical quantum dots built in two-dimensional electron gas.
+These couplings are related to both bulk (Dresselhaus) and structure (Rashba)
+inversion asymmetries. We study the competition between electron-electron and
+spin-orbit interactions on electronic properties of 2-electron quantum dots.",0404017v1
+2008-01-20,Orbital magnetization and its effects in spin-chiral ferromagnetic kagome lattice in the general spin-coupling region,"The orbital magnetization and its effects on the two-dimensional kagom\'{e}
+lattice with spin anisotropies included in the general Hund's coupling region
+have been theoretically studied. The results show that the strength of the
+Hund's coupling, as well as the spin chirality, contributes to the orbital
+magnetization $\mathcal{M}$. Upon varying both these parameters, it is found
+that the two parts of $\mathcal{M}$, i.e., the conventional part
+$\mathbf{M}_{c}$ and the Berry-phase correction part $\mathbf{M}_{\Omega}$,
+oppose each other. The anomalous Nernst conductivity is also calculated and a
+peak-valley structure as a function of the electron Fermi energy is obtained.",0801.3061v1
+2008-08-21,Unconventional pairing in excitonic condensates under spin-orbit coupling,"It is shown that the Rashba and Dresselhaus spin orbit couplings enhance the
+conclusive power in the experiments on the excitonic condensed state by at
+least three low temperature effects. First, spin orbit coupling facilitates the
+photoluminescense measurements via enhancing the bright contribution in the
+otherwise dominantly dark exciton condensed state. The second is the presence
+of a power law temperature dependence of the thermodynamic observables in low
+temperatures and the weakening of the second order transition at the critical
+temperature. The third is the appearance of the nondiagonal elements in the
+static spin susceptibility.",0808.2900v2
+2011-07-21,Transverse Josephson effect due to spin-orbit coupling: Generation of transverse current without time-reversal symmetry breaking,"We investigate transverse Josephson current in superconductor/normal
+metal/superconductor junctions where the normal metal has Rashba type
+spin-orbit coupling. It is shown that trans- verse current arises from the
+spin-orbit coupling in the normal metal. This effect is specific to
+superconducting current and the transverse current vanishes in the normal
+state. In addition, this transverse Josephson effect is purely stationary and
+applied magnetic field is unnecessary to realize this effect, in contrast to
+the Hall effect in the normal state. We also discuss physical interpretation of
+this effect, comparing with the spin Hall effect.",1107.4202v3
+2011-08-09,Spin-orbit coupling and $g$-factor of $X$-valley in cubic GaN,"We report our theoretically investigation on the spin-orbit coupling and
+$g$-factor of the $X$-valley in cubic GaN. We find that the spin-orbit coupling
+coefficient from $sp^3d^5s^\ast$ tight-binding model is 0.029\,eV$\cdot${\AA},
+which is comparable with that in cubic GaAs. By employing the ${\bf k}\cdot{\bf
+p}$ theory, we find that the $g$-factor in this case is only slightly different
+from the free electron $g$-factor. These results are expected to be important
+for the on-going study on spin dynamics far away from equilibrium in cubic GaN.",1108.2059v1
+2012-03-28,Direct Observation of Interband Spin-Orbit Coupling in a Two-Dimensional Electron System,"We report the direct observation of interband spin-orbit (SO) coupling in a
+two-dimensional (2D) surface electron system, in addition to the anticipated
+Rashba spin splitting. Using angle-resolved photoemission experiments and
+first-principles calculations on Bi/Ag/Au heterostructures we show that the
+effect strongly modifies the dispersion as well as the orbital and spin
+character of the 2D electronic states, thus giving rise to considerable
+deviations from the Rashba model. The strength of the interband SO coupling is
+tuned by the thickness of the thin film structures.",1203.6190v1
+2012-12-17,Spin-Orbit Coupling in Multilayer Superconductors with Charge Imbalance,"In this study, we investigate the spin susceptibility in the superconducting
+state of a multilayer system with a layer-dependent Rashba spin-orbit coupling,
+representing a locally non-centrosymmetric superconductor. We show that the
+charge imbalance between different layers yields a strong layer dependence on
+the susceptibility, most significantly for a weak spin-orbit coupling, which is
+in contrast to a situation with an equally distributed charge. These results
+can be relevant for experimental test in multilayer high-Tc cuprates as well as
+in superconducting CeCoIn5/YbCoIn5 superlattices with more than two layers.",1212.3862v2
+2016-08-12,Magnetotransport signatures of the proximity exchange and spin-orbit couplings in graphene,"Graphene on an insulating ferromagnetic substrate---ferromagnetic insulator
+or ferromagnetic metal with a tunnel barrier---is expected to exhibit giant
+proximity exchange and spin-orbit couplings. We use a realistic transport model
+of charge-disorder scattering and solve the linearized Boltzmann equation
+numerically exactly for the anisotropic Fermi contours of modified Dirac
+electrons to find magnetotransport signatures of these proximity effects:
+proximity anisotropic magnetoresistance, inverse spin-galvanic effect, and the
+planar Hall resistivity. We establish the corresponding anisotropies due to the
+exchange and spin-orbit couplings, with respect to the magnetization
+orientation. We also present parameter maps guiding towards optimal regimes for
+observing transport magnetoanisotropies in proximity graphene.",1608.03879v1
+2019-03-19,Quantum corrections to a spin-orbit coupled Bose-Einstein Condensate,"We study systematically the quantum corrections to a weakly interacting
+Bose-Einstein condensate with spin-orbit coupling. We show that quantum
+fluctuations, enhanced by the spin-orbit coupling, modify quantitatively the
+mean-field properties such as the superfluid density, spin polarizability, and
+sound velocity. We find that the phase boundary between the plane wave and zero
+momentum phases is shifted to a smaller transverse field. We also calculate the
+Beliaev and Landau damping rates and find that the Landau process dominates the
+quasiparticle decay even at low temperature.",1903.08182v3
+2016-02-10,Spin-dependent Seebeck Effect in Aharonov-Bohm Rings with Rashba and Dresselhaus Spin-orbit Interactions,"We theoretically investigate the spin-dependent Seebeck effect in an
+Aharonov-Bohm mesoscopic ring in the presence of both Rashba and Dresselhaus
+spin-orbit interactions under magnetic flux perpendicular to the ring. We apply
+the Green's function method to calculate the spin Seebeck coefficient employing
+the tight-binding Hamiltonian. It is found that the spin Seebeck coefficient is
+proportional to the slope of the energy-dependent transmission coefficients. We
+study the strong dependence of spin Seebeck coefficient on the Fermi energy,
+magnetic flux, strength of spin-orbit coupling, and temperature. Maximum spin
+Seebeck coefficients can be obtained when the strengths of Rashba and
+Dresselhaus spin-orbit couplings are slightly different. The spin Seebeck
+coefficient can be reduced by increasing temperature and disorder.",1602.03272v1
+2019-02-21,Spin-orbit coupling and spin relaxation in phosphorene: Intrinsic versus extrinsic effects,"First-principles calculations of the essential spin-orbit and spin relaxation
+properties of phosphorene are performed. Intrinsic spin-orbit coupling induces
+spin mixing with the probability of $b^2 \approx 10^{-4}$, exhibiting a large
+anisotropy, following the anisotropic crystalline structure of phosphorene. For
+realistic values of the momentum relaxation times, the intrinsic
+(Elliott--Yafet) spin relaxation times are hundreds of picoseconds to
+nanoseconds. Applying a transverse electric field (simulating gating and
+substrates) generates extrinsic $C_{2v}$ symmetric spin-orbit fields in
+phosphorene, which activate the D'yakonov--Perel' mechanism for spin
+relaxation. It is shown that this extrinsic spin relaxation also has a strong
+anisotropy, and can dominate over the Elliott-Yafet one for strong enough
+electric fields. Phosphorene on substrates can thus exhibit an interesting
+interplay of both spin relaxation mechanisms, whose individual roles could be
+deciphered using our results.",1902.07957v1
+2014-11-28,Position-dependent spin-orbit coupling for ultracold atoms,"We theoretically explore atomic Bose-Einstein condensates (BECs) subject to
+position-dependent spin-orbit coupling (SOC). This SOC can be produced by
+cyclically laser coupling four internal atomic ground (or metastable) states in
+an environment where the detuning from resonance depends on position. The
+resulting spin-orbit coupled BEC phase-separates into domains, each of which
+contain density modulations - stripes - aligned either along the x or y
+direction. In each domain, the stripe orientation is determined by the sign of
+the local detuning. When these stripes have mismatched spatial periods along
+domain boundaries, non-trivial topological spin textures form at the interface,
+including skyrmions-like spin vortices and anti-vortices. In contrast to
+vortices present in conventional rotating BECs, these spin-vortices are stable
+topological defects that are not present in the corresponding homogenous
+stripe-phase spin-orbit coupled BECs.",1411.7813v2
+2015-10-27,Extrinsic Spin Hall Effect from Anisotropic Rashba Spin-Orbit Coupling in Graphene,"We study the effect of anisotropy of the Rashba coupling on the extrinsic
+spin Hall effect due to spin-orbit active adatoms on graphene. In addition to
+the intrinsic spin-orbit coupling, a generalized anisotropic Rashba coupling
+arising from the breakdown of both mirror and hexagonal symmetries of pristine
+graphene is considered. We find that Rashba anisotropy can strongly modify the
+dependence of the spin Hall angle on carrier concentration. Our model provides
+a simple and general description of the skew scattering mechanism due to the
+spin-orbit coupling that is induced by proximity to large adatom clusters.",1510.07771v1
+2017-10-23,Time-reversal-invariant spin-orbit-coupled bilayer Bose-Einstein Condensates,"Time-reversal invariance plays a crucial role for many exotic quantum phases,
+particularly for topologically nontrivial states, in spin-orbit coupled
+electronic systems. Recently realized spin-orbit coupled cold-atom systems,
+however, lack the time-reversal symmetry due to the inevitable presence of an
+effective transverse Zeeman field. We address this issue by analyzing a
+realistic scheme to preserve time-reversal symmetry in spin-orbit coupled
+ultracold atoms, with the use of Hermite-Gaussian-laser induced Raman
+transitions that preserve spin-layer time-reversal symmetry. We find that the
+system's quantum states form Kramers pairs, resulting in symmetry-protected gap
+closing of the lowest two bands at arbitrarily large Raman coupling. We also
+show that Bose gases in this setup exhibit interaction-induced layer-stripe and
+uniform phases as well as intriguing spin-layer symmetry and spin-layer
+correlation.",1710.08323v2
+2018-01-11,Thermoelectric properties of a quantum dot coupled to magnetic leads by Rashba spin-orbit interaction,"We consider a single-level quantum dot coupled to two leads which are
+ferromagnetic in general. Apart from tunneling processes conserving electron
+spin, we also include processes associated with spin-flip of tunneling
+electrons, which appear due to Rashba spin-orbit coupling. Charge and heat
+currents are calculated within the non-equilibrium Green's function technique.
+When the electrodes are half-metallic (fully spin polarized), the Rashba
+spin-orbit coupling leads to Fano-like interference effects, which result in an
+enhanced thermoelectric response. It is also shown that such a system can
+operate as efficient heat engine. Furthermore, the interplay of Rashba
+spin-orbit coupling and Zeeman splitting due to an external magnetic field is
+shown to allow control over such parameters of the heat engine as the power and
+efficiency.",1801.03700v1
+2020-01-16,Spontaneous Antisymmetric Spin Splitting in Noncollinear Antiferromagnets without Spin-Orbit Coupling,"We propose a realization of an antisymmetric spin-split band structure
+through magnetic phase transitions without spin-orbit coupling. It enables us
+to utilize for a variety of magnetic-order-driven cross-correlated and
+nonreciprocal transport phenomena as similar to those in the
+spin-orbit-coupling oriented systems. We unveil its general condition as an
+emergence of a bond-type magnetic toroidal multipole (polar tensor) in the
+triangular unit with the noncollinear 120$^{\circ}$-AFM structures. By using
+the concept of augmented multipoles, we systematically analyze the phenomena in
+terms of an effective multipole coupling. Our multipole description is
+ubiquitously applied to any trigonal and hexagonal structures including the
+triangular, kagome, and breathing kagome structures, which provides how to
+design and engineer materials with a giant antisymmetric spin splitting and its
+physical responses even without the spin-orbit coupling.",2001.05630v2
+2020-04-27,Spin-orbit coupled superconductivity: Rashba-Hubbard model on the square lattice,"The weak-coupling renormalization group method is an asymptotically exact
+method to find superconducting instabilities of a lattice model of correlated
+electrons. Here we extend it to spin-orbit coupled lattice systems and study
+the emerging superconducting phases of the Rashba-Hubbard model. Since Rashba
+type spin-orbit coupling breaks inversion symmetry, the arising superconducting
+phases may be a mixture of spin-singlet and spin-triplet states. We study the
+two-dimensional square lattice as a paradigm and discuss the symmetry
+properties of the arising spin-orbit coupled superconducting states including
+helical spin-triplet superconductivity. We also discuss how to best deal with
+split energy bands within a method which restricts paired electrons to momenta
+on the Fermi surface.",2004.12624v2
+2019-01-02,Dresselhaus spin-orbit coupling in [111]-oriented semiconductor nanowires,"The contribution of bulk inversion asymmetry to the total spin-orbit coupling
+is commonly neglected for group III-V nanowires grown in the generic [111]
+direction. We have solved the complete Hamiltonian of the circular nanowire
+accounting for bulk inversion asymmetry via exact numerical diagonalization.
+Three different symmetry classes of angular momentum states exist, which
+reflects the threefold rotation symmetry of the crystal lattice about the [111]
+axis. A particular group of angular momentum states contains degenerate modes
+which are strongly coupled via the Dresselhaus Hamiltonian, which results in a
+significant energy splitting with increasing momentum. Hence, under certain
+conditions Dresselhaus spin-orbit coupling is relevant for [111] InAs and [111]
+InSb nanowires. We demonstrate momentum-dependent energy splittings and the
+impact of Dresselhaus spin-orbit coupling on the dispersion relation. In view
+of possible spintronics applications relying on bulk inversion asymmetry we
+calculate the spin expectation values and the spin texture as a function of the
+Fermi energy. Finally, we investigate the effect of an axial magnetic field on
+the energy spectrum and on the corresponding spin polarization.",1901.00362v2
+2018-06-27,Tunable spin-orbit coupling and magnetic superstripe phase in a BEC,"Superstripe phases in Bose-Einstein condensates (BECs), possessing both
+crystalline structure and superfluidity, opens a new avenue for exploring
+exotic quantum matters---supersolids. However, conclusive detection and further
+exploration of a superstripe is still challenging in experiments because of its
+short period, low visibility, fragility against magnetic field fluctuation or
+short lifetime. Here we propose a scheme in a spin-orbit coupled BEC which
+overcomes these obstacles and generates a robust magnetic superstripe phase,
+with only spin (no total) density modulation due to the magnetic translational
+symmetry, ready for direct real-space observation. In the scheme, two hyperfine
+spin states are individually Raman coupled with a largely-detuned third state,
+which induce a momentum-space separation between two lower band dispersions,
+yielding an effective spin-1/2 system with tunable spin-orbit coupling and
+Zeeman fields. Without effective Zeeman fields, spin-dependent interaction
+dominates, yielding a magnetic superstripe phase with a long tunable period and
+high visibility. Our scheme provides a platform for observing and exploring
+exotic properties of superstripe phases as well as novel physics with tunable
+spin-orbit coupling.",1806.10568v2
+2017-10-05,Dirac and topological phonons with spin-orbital entangled orders,"We propose to study novel quantum phases and excitations for a 2D spin-orbit
+(SO) coupled bosonic $p$-orbital optical lattice based on the recent
+experiments. The orbital and spin degrees of freedom with SO coupling compete
+and bring about nontrivial interacting quantum effects. We develop a
+self-consistent method for bosons and predict a spin-orbital entangled order
+for the ground phase, in sharp contrast to spinless high-orbital systems.
+Furthermore, we investigate the Bogoliubov excitations, showing that the Dirac
+and topological phonons are obtained corresponding to the predicted different
+spin-orbital orders. In particular, the topological phonons exhibit a bulk gap
+which can be several times larger than the single-particle gap of $p$-bands,
+reflecting the enhancement of topological effect by interaction. Our results
+highlight the rich physics predicted in SO coupled high-orbital systems and
+shall attract experimental efforts in the future.",1710.02070v2
+2014-02-26,Harmonically trapped two-atom systems: Interplay of short-range s-wave interaction and spin-orbit coupling,"The coupling between the spin degrees of freedom and the orbital angular
+momentum has a profound effect on the properties of nuclei, atoms and condensed
+matter systems. Recently, synthetic gauge fields have been realized
+experimentally in neutral cold atom systems, giving rise to a spin-orbit
+coupling term with ""strength"" $k_{\text{so}}$. This paper investigates the
+interplay between the single-particle spin-orbit coupling term of Rashba type
+and the short-range two-body $s$-wave interaction for cold atoms under external
+confinement. Specifically, we consider two different harmonically trapped
+two-atom systems. The first system consists of an atom with spin-orbit coupling
+that interacts with a structureless particle through a short-range two-body
+potential. The second system consists of two atoms that both feel the
+spin-orbit coupling term and that interact through a short-range two-body
+potential. Treating the spin-orbit term perturbatively, we determine the
+correction to the ground state energy for various generic parameter
+combinations. Selected excited states are also treated. An important aspect of
+our study is that the perturbative treatment is not limited to small $s$-wave
+scattering lengths but provides insights into the system behavior over a wide
+range of scattering lengths, including the strongly-interacting unitary regime.
+Our perturbative results are confirmed by numerical calculations that expand
+the eigenfunctions of the two-particle Hamiltonian in terms of basis functions
+that contain explicitly correlated Gaussians.",1402.6734v1
+2004-09-02,Spin-orbit coupling and anisotropy of spin splitting in quantum dots,"In lateral quantum dots, the combined effect of both Dresselhaus and
+Bychkov-Rashba spin orbit coupling is equivalent to an effective magnetic field
+B_so which has the opposite sign for s_z=1/2 spin electrons. When the external
+magnetic field is perpendicular to the planar structure, the field B_so
+generates an additional splitting for electron states as compared to the spin
+splitting in the in-plane field orientation. The anisotropy of spin splitting
+has been measured and then analyzed in terms of spin-orbit coupling in several
+AlGaAs/GaAs quantum dots by means of resonanat tunneling spectroscopy. From the
+measured values and sign of the anisotropy we are able to determine the
+dominating spin-orbit coupling mechanism.",0409054v1
+2020-08-06,Near Total Electronic Spin Separation as Caused by Nuclear Dynamics: Perturbing a Real-Valued Conical Intersection with Complex-Valued Spin-Orbit Coupling,"We investigate the nuclear dynamics near a real-valued conical intersection
+that is perturbed by a complex-valued spin-orbit coupling. For a model
+Hamiltonian with two outgoing channels, we find that even a small spin-orbit
+coupling can dramatically affect the pathway selection on account of Berry
+force, leading to extremely large spin selectivity (sometime as large as 100%).
+Thus, this Letter opens the door for organic chemists to start designing
+spintronic devices that use nuclear motion and conical intersections (combined
+with standard spin-orbit coupling) in order to achieve spin selection. Vice
+versa, for physical chemists, this Letter also emphasizes that future
+semiclassical simulations of intersystem crossing (which have heretofore
+ignored Berry force) should be corrected to account for the spin polarization
+that inevitably arises when dynamics pass near conical intersections.",2008.02443v1
+2003-05-14,Persistent current in ballistic mesoscopic rings with Rashba spin-orbit coupling,"The presence of spin-orbit coupling affects the spontaneously flowing
+persistent currents in mesoscopic conducting rings. Here we analyze their
+dependence on magnetic flux with emphasis on identifying possibilities to prove
+the presence and extract the strength of Rashba spin splitting in
+low-dimensional systems. Effects of disorder and mixing between
+quasi-onedimensional ring subbands are considered. The spin-orbit coupling
+strength can be inferred from the values of flux where sign changes occur in
+the persistent charge current. As an important consequence of the presence of
+spin splitting, we identify a nontrivial persistent spin current that is not
+simply proportional to the charge current. The different flux dependences of
+persistent charge and spin currents are a unique signature of spin-orbit
+coupling affecting the electronic structure of the ring.",0305310v1
+2017-03-10,Spin-orbit dynamics of single acceptor atoms in silicon,"Two-level quantum systems with strong spin-orbit coupling allow for
+all-electrical qubit control and long-distance qubit coupling via microwave and
+phonon cavities, making them of particular interest for scalable quantum
+information technologies. In silicon, a strong spin-orbit coupling exists
+within the spin-3/2 system of acceptor atoms and their energy levels and
+properties are expected to be highly tunable. Here we show the influence of
+local symmetry tuning on the acceptor spin-dynamics, measured in the
+single-atom regime. Spin-selective tunneling between two coupled boron atoms in
+a commercial CMOS transistor is utilised for spin-readout, which allows for the
+probing of the two-hole spin relaxation mechanisms. A relaxation-hotspot is
+measured and explained by the mixing of acceptor heavy and light hole states.
+Furthermore, excited state spectroscopy indicates a magnetic field controlled
+rotation of the quantization axes of the atoms. These observations demonstrate
+the tunability of the spin-orbit states and dynamics of this spin-3/2 system.",1703.03538v1
+2017-08-25,Spin Liquid versus Spin Orbit Coupling on the Triangular Lattice,"In this paper, we explore the relationship between strong spin-orbit coupling
+and spin liquid physics. We study a very general model on the triangular
+lattice where spin-orbit coupling leads to the presence of highly anisotropic
+interactions. We use variational Monte Carlo to study both $U(1)$ quantum spin
+liquid states and ordered ones, via the Gutzwiller projected fermion
+construction. We thereby obtain the ground state phase diagram in this phase
+space. We furthermore consider effects beyond the Gutzwiller wavefunctions for
+the spinon Fermi surface quantum spin liquid, which are of particular
+importance when spin-orbit coupling is present.",1708.07856v3
+2020-07-07,Unidirectional spin transport of a spin-orbit-coupled atomic matter wave using a moving Dirac $δ$-potential well,"We study the transport of a spin-orbit-coupled atomic matter wave using a
+moving Dirac $\delta$-potential well. In a spin-orbit-coupled system, bound
+states can be formed in both ground and excited energy levels with a Dirac
+$\delta$ potential. Because Galilean invariance is broken in a
+spin-orbit-coupled system, moving of the potential will induce a
+velocity-dependent effective detuning. This induced detuning breaks the spin
+symmetry and makes the ground-state transporting channel be spin-$\uparrow$
+($\downarrow$) favored while makes the excited-state transporting channel be
+spin-$\downarrow$ ($\uparrow$) favored for a positive-direction
+(negative-direction) transporting. When the $\delta$-potential well moves at a
+small velocity, both the ground-state and the excited-state channels contribute
+to the transportation, and thus both the spin components can be efficiently
+transported. However, when the moving velocity of the $\delta$-potential well
+exceeds a critical value, the induced detuning is large enough to eliminate the
+excited bound state, and makes the ground bound state the only transporting
+channel, in which only the spin-$\uparrow$ ($\downarrow$) component can be
+efficiently transported in a positive (negative) direction. This work
+demonstrates a prototype of unidirectional spin transport.",2007.03147v1
+2016-05-18,Pairing mechanism of unconventional superconductivity in doped Kane-Mele model,"We study the pairing symmetry of a doped Kane-Mele model on a honeycomb
+lattice with on-site Coulomb interaction. The pairing instability of Cooper
+pair is calculated based on the linearized Eliashberg equation within the
+random phase approximation (RPA). When the magnitude of the spin-orbit coupling
+is weak, even-frequency spin-singlet even-parity (ESE) pairing is dominant. On
+the other hand, with the increase of the spin-orbit coupling, we show that the
+even-frequency spin-triplet odd-parity (ETO) f-wave pairing exceeds ESE one.
+ETO f-wave pairing is supported by the longitudinal spin fluctuation. Since the
+transverse spin fluctuation is strongly suppressed by spin-orbit coupling, ETO
+f-wave pairing becomes dominant for large magnitude of spin-orbit coupling.",1605.05563v3
+2023-07-06,Classification and magic magnetic-field directions for spin-orbit-coupled double quantum dots,"The spin of a single electron confined in a semiconductor quantum dot is a
+natural qubit candidate. Fundamental building blocks of spin-based quantum
+computing have been demonstrated in double quantum dots with significant
+spin-orbit coupling. Here, we show that spin-orbit-coupled double quantum dots
+can be categorised in six classes, according to a partitioning of the
+multi-dimensional space of their $g$-tensors. The class determines physical
+characteristics of the double dot, i.e., features in transport, spectroscopy
+and coherence measurements, as well as qubit control, shuttling, and readout
+experiments. In particular, we predict that the spin physics is highly
+simplified due to pseudospin conservation, whenever the external magnetic field
+is pointing to special directions (`magic directions'), where the number of
+special directions is determined by the class. We also analyze the existence
+and relevance of magic loops in the space of magnetic-field directions,
+corresponding to equal local Zeeman splittings. These results present an
+important step toward precise interpretation and efficient design of spin-based
+quantum computing experiments in materials with strong spin-orbit coupling.",2307.02958v1
+2023-08-21,Displacement-field-tunable superconductivity in an inversion-symmetric twisted van der Waals heterostructure,"We investigate the superconducting properties of inversion-symmetric twisted
+trilayer graphene by considering different parent states, including
+spin-singlet, triplet, and SO(4) degenerate states, with or without nodal
+points. By placing transition metal dichalcogenide layers above and below
+twisted trilayer graphene, spin-orbit coupling is induced in TTLG and, due to
+inversion symmetry, the spin-orbit coupling does not spin-split the bands. The
+application of a displacement field ($D_0$) breaks the inversion symmetry and
+creates spin-splitting. We analyze the evolution of the superconducting order
+parameters in response to the combined spin-orbit coupling and $D_0$-induced
+spin-splitting. Utilizing symmetry analysis combined with both a direct
+numerical evaluation and a complementary analytical study of the gap equation,
+we provide a comprehensive understanding of the influence of spin-orbit
+coupling and $D_0$ on superconductivity. These results contribute to a better
+understanding of the superconducting order in twisted trilayer graphene.",2308.10530v1
+2018-07-17,Field-free spin-orbit torque switching from geometrical domain wall pinning,"Spin-orbit torques, which utilize spin currents arising from the spin-orbit
+coupling, offer a novel method to electrically switch the magnetization with
+perpendicular anisotropy. However, the necessity of an external magnetic field
+to achieve a deterministic switching is an obstacle for realizing practical
+spin-orbit torque devices with all-electric operation. Here, we report a
+field-free spin-orbit torque switching by exploiting the domain wall motion in
+an anti-notched microwire with perpendicular anisotropy, which exhibits
+multi-domain states stabilized by the domain wall surface tension. The
+combination of spin-orbit torque, Dzyaloshinskii-Moriya interaction, and domain
+wall surface tension induced geometrical pinning allows a deterministic control
+of the domain wall and offers a novel method to achieve a field-free spin-orbit
+torque switching. Our work demonstrates the proof of concept of a perpendicular
+memory cell which can be readily adopted in a three-terminal magnetic memory.",1807.06287v1
+2003-04-16,Electron spin precession in semiconductor quantum wires with Rashba spin-orbit coupling,"The influence of the Rashba spin-orbit coupling on the electron spin dynamics
+is investigated for a ballistic semiconductor quantum wire with a finite width.
+We monitor the spin evolution using the time-dependent Schr\""odinger equation.
+The pure spin precession characteristic of the 1D limit is lost in a 2D wire
+with a finite lateral width. In general, the time evolution in the latter case
+is characterized by several frequencies and a nonrigid spin motion.",0304372v1
+2004-03-08,Conductance modulation in spin field-efect transistors under finite bias voltages,"The conductance modulations in spin field-effect transistors under finite
+bias voltages were studied. It was shown that when a finite bias voltage is
+applied between two terminals of a spin field-effect transistor, the spin
+precession states of injected spin-polarized electrons in the semiconductor
+channel of the device will depend not only the gate-voltage controlled Rashba
+spin-orbit coupling but also depend on the bias voltage and, hence, the
+conductance modulation in the device due to Rashba spin-orbit coupling may also
+depend sensitively on the bias voltage.",0403199v1
+2005-06-21,Intrinsic Spin Hall Edges,"The prediction of intrinsic spin Hall currents by Murakami \textit{et al.}
+and Sinova \textit{et al.} raised many questions about methods of detection and
+the effect of disorder. We focus on a contact between a Rashba type spin orbit
+coupled region with a normal two-dimensional electron gas and show that the
+spin Hall currents, though vanishing in the bulk of the sample, can be
+recovered from the edges. We also show that the current induced spin
+accumulation in the spin orbit coupled system diffuses into the normal region
+and contributes to the spin current in the leads.",0506531v2
+2010-01-26,Effect of spin-conserving scattering on Gilbert damping in ferromagnetic semiconductors,"The Gilbert damping in ferromagnetic semiconductors is theoretically
+investigated based on the $s$-$d$ model. In contrast to the situation in
+metals, all the spin-conserving scattering in ferromagnetic semiconductors
+supplies an additional spin relaxation channel due to the momentum dependent
+effective magnetic field of the spin-orbit coupling, thereby modifies the
+Gilbert damping. In the presence of a pure spin current, we predict a new
+contribution due to the interplay of the anisotropic spin-orbit coupling and a
+pure spin current.",1001.4576v1
+2011-02-15,Kondo Spin Screening Cloud in Two-dimensional Electron Gas with Spin-orbit Couplings,"A spin-1/2 Anderson impurity in a semiconductor quantum well with Rashba and
+Dresselhaus spin-orbit couplings is studied by using a variational wave
+function method. The local magnetic moment is found to be quenched at low
+temperatures. The spin-spin correlations of the impurity and the conduction
+electron density show anisotropy in both spatial and spin spaces, which
+interpolates the Kondo spin screenings of a conventional metal and of a surface
+of three-dimensional topological insulators.",1102.2947v1
+2012-12-13,Spin dynamics in tunneling decay of a metastable state,"We analyze spin dynamics in the tunneling decay of a metastable localized
+state in the presence of spin-orbit coupling. We find that the spin
+polarization at short time scales is affected by the initial state while at
+long time scales both the probability- and the spin density exhibit
+diffraction-in-time phenomenon. We find that in addition to the tunneling time
+the tunneling in general can be characterized by a new parameter, the tunneling
+length. Although the tunneling length is independent on the spin-orbit
+coupling, it can be accessed by the spin rotation measurement.",1212.3325v1
+2013-02-08,Spin dynamics of cold fermions with synthetic spin-orbit coupling,"We consider spin relaxation dynamics in cold Fermi gases with a pure-gauge
+spin-orbit coupling corresponding to recent experiments. We show that such
+experiments can give a direct access to the collisional spin drag rate, and
+establish conditions for the observation of spin drag effects. In the recent
+experiments the dynamics is found to be mainly ballistic leading to new regimes
+of reversible spin relaxation-like processes.",1302.2121v1
+2017-08-22,Spin-dependent Andreev reflection in spin-orbit coupled systems by breaking time-reversal symmetry,"We study theoretically the differential conductance at a junction between a
+time reversal symmetry broken spin orbit coupled system with a tunable band gap
+and a superconductor. We look for spin-dependent Andreev reflection (i.e,
+sub-gap transport) and show that when various mass terms compete in energy,
+there is substantial difference of Andreev reflection probability depending on
+the spin of the incident electron. We further analyze the origin of such
+spin-dependence and show how the incident angle of the electrons controls the
+spin-dependence of the transport.",1708.06773v2
+2017-07-13,Spin filtering effect generated by the inter-subband spin-orbit coupling in the bilayer nanowire with the quantum point contact,"The spin filtering effect in the bilayer nanowire with quantum point contact
+is investigated theoretically. We demonstrate the new mechanism of the spin
+filtering based on the lateral inter-subband spin-orbit coupling, which for the
+bilayer nanowires has been reported to be strong. The proposed spin filtering
+effect is explained as the joint effect of the Landau-Zener inter-subband
+transitions caused by the hybridization of states with opposite spin (due to
+the lateral Rashba SO interaction) and the confinement of carriers in the
+quantum point contact region.",1707.04086v1
+2012-05-30,"Multiple Superconducting Gaps, Anisotropic Spin Fluctuations and Spin-Orbit Coupling in Iron-Pnictides","This article reviews the NMR and NQR studies on iron-based high-temperature
+superconductors by the IOP/Okayama group. It was found that the electron pairs
+in the superconducting state are in the spin-singlet state with multiple
+fully-opened energy gaps. The antiferromagnetic spin fluctuations in the normal
+state are found to be closely correlated with the superconductivity. Also the
+antiferromagnetic spin fluctuations are anisotropic in the spin space, which is
+different from the case in copper oxide superconductors. This anisotropy
+originates from the spin-orbit coupling and is an important reflection of the
+multiple-bands nature of this new class of superconductors.",1205.6589v1
+2017-05-15,Spin and tunneling dynamics in an asymmetrical double quantum dot with spin - orbit coupling,"In this article we study the spin and tunneling dynamics as a function of
+magnetic field in a one-dimensional GaAs double quantum dot with both the
+Dresselhaus and Rashba spin-orbit coupling. In particular we consider different
+spatial widths for the spin-up and spin-down electronic states. We find that
+the spin dynamics is a superposition of slow as well as fast Rabi oscillations.
+It is found that the Rashba interaction strength as well as the external
+magnetic field strongly modifies the slow Rabi oscillations which is
+particularly useful for single qubit manipulation for possible quantum computer
+applications.",1705.05395v1
+2023-03-10,Chiral spin channels in curved graphene $pn$ junctions,"We show that the chiral modes in circular graphene $pn$ junctions provide an
+advantage for spin manipulation via spin-orbit coupling compared to
+semiconductor platforms. We derive the effective Hamiltonian for the spin
+dynamics of the junction's zero modes and calculate their quantum phases. We
+find a sweet spot in parameter space where the spin is fully in-plane and
+radially polarized for a given junction polarity. This represents a shortcut to
+singular spin configurations that would otherwise require spin-orbit coupling
+strengths beyond experimental reach.",2303.05833v2
+2003-10-28,Phonon-induced decay of the electron spin in quantum dots,"We study spin relaxation and decoherence in a
+  GaAs quantum dot due to spin-orbit interaction. We derive an effective
+Hamiltonian which couples the electron spin to phonons or any other fluctuation
+of the dot potential. We show that the spin decoherence time $T_2$ is as large
+as the spin relaxation time $T_1$, under realistic conditions. For the
+Dresselhaus and Rashba spin-orbit couplings, we find that, in leading order,
+the effective magnetic field can have only fluctuations transverse to the
+applied magnetic field. As a result, $T_2=2T_1$ for arbitrarily large Zeeman
+splittings, in contrast to the naively expected case
+  $T_2\ll T_1$. We show that the spin decay is drastically suppressed for
+certain magnetic field directions and values of the
+  Rashba coupling constant. Finally, for the spin coupling to acoustic phonons,
+we show that
+  $T_2=2T_1$ for all spin-orbit mechanisms in leading order in the
+electron-phonon interaction.",0310655v1
+2012-02-07,Prediction of Giant Spin Motive Force due to Rashba Spin-Orbit Coupling,"Magnetization dynamics in a ferromagnet can induce a spin-dependent electric
+field through spin motive force. Spin current generated by the spin-dependent
+electric field can in turn modify the magnetization dynamics through
+spin-transfer torque. While this feedback effect is usually weak and thus
+ignored, we predict that in Rashba spin-orbit coupling systems with large
+Rashba parameter $\alpha_{\rm R}$, the coupling generates the spin-dependent
+electric field [$\pm(\alpha_{\rm R}m_e/e\hbar) (\vhat{z}\times \partial
+\vec{m}/\partial t)]$, which can be large enough to modify the magnetization
+dynamics significantly. This effect should be relevant for device applications
+based on ultrathin magnetic layers with strong Rashba spin-orbit coupling.",1202.1406v2
+2015-03-11,Spin-wave-induced spin torque in Rashba spin-orbit coupling system,"We study the effects of Rashba spin-orbit coupling on the spin torque induced
+by spin waves, which are the plane wave dynamics of magnetization. The spin
+torque is derived from linear response theory, and we calculate the dynamic
+spin torque by considering the impurity-ladder-sum vertex corrections. This
+dynamic spin torque is divided into three terms: a damping term, a $distortion$
+term, and a correction term for the equation of motion. The $distorting$ torque
+describes a phenomenon unique to the Rashba spin-orbit coupling system, where
+the distorted motion of magnetization precession is subjected to the
+anisotropic force from the Rashba coupling. The oscillation mode of the
+precession exhibits an elliptical trajectory, and the ellipticity depends on
+the strength of the nesting effects, which could be reduced by decreasing the
+electron lifetime.",1503.03171v2
+2016-12-13,Spin precession and spin waves in a chiral electron gas: beyond Larmor's theorem,"Larmor's theorem holds for magnetic systems that are invariant under spin
+rotation. In the presence of spin-orbit coupling this invariance is lost and
+Larmor's theorem is broken: for systems of interacting electrons, this gives
+rise to a subtle interplay between the spin-orbit coupling acting on individual
+single-particle states and Coulomb many-body effects. We consider a
+quasi-two-dimensional, partially spin-polarized electron gas in a semiconductor
+quantum well in the presence of Rashba and Dresselhaus spin-orbit coupling.
+Using a linear-response approach based on time-dependent density-functional
+theory, we calculate the dispersions of spin-flip waves. We obtain analytic
+results for small wave vectors and up to second order in the Rashba and
+Dresselhaus coupling strengths $\alpha$ and $\beta$. Comparison with
+experimental data from inelastic light scattering allows us to extract $\alpha$
+and $\beta$ as well as the spin-wave stiffness very accurately. We find
+significant deviations from the local density approximation for spin-dependent
+electron systems.",1612.04314v1
+2021-03-11,Spin-charge conversion and current vortex in spin-orbit coupled systems,"Using response theory, we calculate the charge-current vortex generated by
+spin pumping at a point-like contact in a system with Rashba spin-orbit
+coupling. We discuss the spatial profile of the current density for finite
+temperature and for the zero-temperature limit. The main observation is that
+the Rashba spin precession leads to a charge current that oscillates as a
+function of the distance from the spin-pumping source, which is confirmed by
+numerical simulations. In our calculations, we consider a Rashba model on a
+square lattice, for which we first review the basic properties related to
+charge and spin transport. In particular, we define the charge- and
+spin-current operators for the tight-binding Hamiltonian as the currents
+coupled linearly with the U(1) and SU(2) gauge potentials, respectively. By
+analogy to the continuum model, the spin-orbit-coupling Hamiltonian on the
+lattice is then introduced as the generator of the spin current.",2103.06540v2
+2020-12-12,Dilemma in strongly correlated materials: Hund's metal vs relativistic Mott insulator,"We point out the generic competition between the Hund's coupling and the
+spin-orbit coupling in correlated materials, and this competition leads to an
+electronic dilemma between the Hund's metal and the relativistic insulators.
+Hund's metals refer to the fate of the would-be insulators where the Hund's
+coupling suppresses the correlation and drives the systems into correlated
+metals. Relativistic Mott insulators refer to the fate of the would-be metals
+where the relativistic spin-orbit coupling enhances the correlation and drives
+the systems into Mott insulators. These contradictory trends are naturally
+present in many correlated materials. We study the competition between Hund's
+coupling and spin-orbit coupling in correlated materials and explore the
+interplay and the balance from these two contradictory trends. The system can
+become a spin-orbit-coupled Hund's metal or a Hund's assisted relativistic Mott
+insulator. Our observation could find a broad application and relevance to many
+correlated materials with multiple orbitals.",2012.06752v1
+2021-03-23,The Onset of Chaos in Permanently Deformed Binaries from Spin-Orbit and Spin-Spin Coupling,"Permanently deformed objects in binary systems can experience complex
+rotation evolution, arising from the extensively studied effect of spin-orbit
+coupling as well as more nuanced dynamics arising from spin-spin interactions.
+The ability of an object to sustain an aspheroidal shape largely determines
+whether or not it will exhibit non-trivial rotational behavior. In this work,
+we adopt a simplified model of a gravitationally interacting primary and
+satellite pair, where each body's quadrupole moment is approximated by two
+diametrically opposed point masses. After calculating the net gravitational
+torque on the satellite from the primary, and the associated equations of
+motion, we employ a Hamiltonian formalism which allows for a perturbative
+treatment of the spin-orbit and retrograde and prograde spin-spin coupling
+states. By analyzing the resonances individually and collectively, we determine
+the criteria for resonance overlap and the onset of chaos, as a function of
+orbital and geometric properties of the binary. We extend the 2D planar
+geometry to calculate the obliquity evolution, and find that satellites in
+spin-spin resonances undergo precession when inclined out of the plane, but do
+not tumble. We apply our resonance overlap criteria to the contact binary
+system (216) Kleopatra, and find that its satellites, Cleoselene and
+Alexhelios, may plausibly be exhibiting chaotic rotational dynamics from the
+overlap of the spin-orbit and retrograde spin-spin resonances. While this model
+is by construction generalizable to any binary system, it will be particularly
+useful to study small bodies in the solar system, whose irregular shapes make
+them ideal candidates for exotic rotational states.",2103.12484v1
+2011-11-30,Theory of spin-orbit coupling in bilayer graphene,"Theory of spin-orbit coupling in bilayer graphene is presented. The
+electronic band structure of the AB bilayer in the presence of spin-orbit
+coupling and a transverse electric field is calculated from first-principles
+using the linearized augmented plane wave method implemented in the WIEN2k
+code. The first-principles results around the K points are fitted to a
+tight-binding model. The main conclusion is that the spin-orbit effects in
+bilayer graphene derive essentially from the single-layer spin-orbit coupling
+which comes almost solely from the d orbitals. The intrinsic spin-orbit
+splitting (anticrossing) around the K points is about 24\mu eV for the
+low-energy valence and conduction bands, which are closest to the Fermi level,
+similarly as in the single layer graphene. An applied transverse electric field
+breaks space inversion symmetry and leads to an extrinsic (also called
+Bychkov-Rashba) spin-orbit splitting. This splitting is usually linearly
+proportional to the electric field. The peculiarity of graphene bilayer is that
+the low-energy bands remain split by 24\mu eV independently of the applied
+external field. The electric field, instead, opens a semiconducting band gap
+separating these low-energy bands. The remaining two high-energy bands are
+spin-split in proportion to the electric field; the proportionality coefficient
+is given by the second intrinsic spin-orbit coupling, whose value is 20\mu eV.
+All the band-structure effects and their spin splittings can be explained by
+our tight-binding model, in which the spin-orbit Hamiltonian is derived from
+symmetry considerations. The magnitudes of intra- and interlayer
+couplings---their values are similar to the single-layer graphene ones---are
+determined by fitting to first-principles results.",1111.7223v2
+2015-05-12,Spin-orbit interactions of light,"Light carries spin and orbital angular momentum. These dynamical properties
+are determined by the polarization and spatial degrees of freedom of light.
+Modern nano-optics, photonics, and plasmonics, tend to explore subwavelength
+scales and additional degrees of freedom of structured, i.e.,
+spatially-inhomogeneous, optical fields. In such fields, spin and orbital
+properties become strongly coupled with each other. We overview the fundamental
+origins and important applications of the main spin-orbit interaction phenomena
+in optics. These include: spin-Hall effects in inhomogeneous media and at
+optical interfaces, spin-dependent effects in nonparaxial (focused or
+scattered) fields, spin-controlled shaping of light using anisotropic
+structured interfaces (metasurfaces), as well as robust spin-directional
+coupling via evanescent near fields. We show that spin-orbit interactions are
+inherent in all basic optical processes, and they play a crucial role at
+subwavelength scales and structures in modern optics.",1505.02864v2
+2020-09-14,Many-Body Phases of a Planar Bose-Einstein Condensate with Cavity-Induced Spin-Orbit Coupling,"We explore the many-body phases of a two-dimensional Bose-Einstein condensate
+with cavity-mediated dynamic spin-orbit coupling. By the help of two transverse
+non-interfering, counterpropagating pump lasers and a single standing-wave
+cavity mode, two degenerate Zeeman sub-levels of the quantum gas are Raman
+coupled in a double-$\Lambda$-configuration. Beyond a critical pump strength
+the cavity mode is populated via coherent superradiant Raman scattering from
+the two pump lasers, leading to the appearance of a dynamical spin-orbit
+coupling for the atoms. We identify three quantum phases with distinct atomic
+and photonic properties: the normal ``homogeneous'' phase, the superradiant
+``spin-helix'' phase, and the superradiant ``supersolid spin-density-wave''
+phase. The latter exhibits an emergent periodic atomic density distribution
+with an orthorhombic centered rectangular-lattice structure due to the
+interplay between the coherent photon scattering into the resonator and the
+collision-induced momentum coupling. The transverse lattice spacing of the
+emergent crystal is set by the dynamic spin-orbit coupling.",2009.06475v1
+2006-04-01,Doping dependence of spin and orbital correlations in layered manganites,"We investigate the interplay between spin and orbital correlations in
+monolayer and bilayer manganites using an effective spin-orbital t-J model
+which treats explicitly the e_g orbital degrees of freedom coupled to classical
+t_{2g} spins. Using finite clusters with periodic boundary conditions, the
+orbital many-body problem is solved by exact diagonalization, either by
+optimizing spin configuration at zero temperature, or by using classical
+Monte-Carlo for the spin subsystem at finite temperature. In undoped
+two-dimensional clusters, a complementary behavior of orbital and spin
+correlations is found - the ferromagnetic spin order coexists with alternating
+orbital order, while the antiferromagnetic spin order, triggered by t_{2g} spin
+superexchange, coexists with ferro-orbital order. With finite crystal field
+term, we introduce a realistic model for La_{1-x}Sr_{1+x}MnO_4, describing a
+gradual change from predominantly out-of-plane 3z^2-r^2 to in-plane x^2-y^2
+orbital occupation under increasing doping. The present electronic model is
+sufficient to explain the stability of the CE phase in monolayer manganites at
+doping x=0.5, and also yields the C-type antiferromagnetic phase found in
+Nd_{1-x}Sr_{1+x}MnO_4 at high doping. Also in bilayer manganites magnetic
+phases and the accompanying orbital order change with increasing doping. Here
+the model predicts C-AF and G-AF phases at high doping x>0.75, as found
+experimentally in La_{2-2x}Sr_{1+2x}Mn_2O_7.",0604014v1
+2009-05-14,Orbitally induced string formation in the spin-orbital polarons,"We study the spectral function of a single hole doped into the (a,b) plane of
+the Mott insulator LaVO$_3$, with antiferromagnetic (AF) spin order of S=1
+spins accompanied by alternating orbital (AO) order of active
+$\{d_{yz},d_{zx}\}$ orbitals. Starting from the respective t-J model, with
+spin-orbital superexchange and effective three-site hopping terms, we derive
+the polaron Hamiltonian and show that a hole couples simultaneously to the
+collective excitations of the AF/AO phase, magnons and orbitons. Next, we solve
+this polaron problem using the self-consistent Born approximation and find a
+stable quasiparticle solution -- a spin-orbital polaron. We show that the
+spin-orbital polaron resembles the orbital polaron found in $e_g$ systems, as
+e.g. in K$_2$CuF$_4$ or (to some extent) in LaMnO$_3$, and that the hole may be
+seen as confined in a string-like potential. However, the spins also play a
+crucial role in the formation of this polaron -- we explain how the orbital
+degrees of freedom: (i) confine the spin dynamics acting on the hole as the
+classical Ising spins, and (ii) generate the string potential which is of the
+joint spin-orbital character. Finally, we discuss the impact of the results
+presented here on the understanding of the phase diagrams of the lightly doped
+cubic vanadates.",0905.2380v1
+2007-05-14,Cooling Torsional Nanomechanical Vibration by Spin-Orbit Interactions,"We propose and study a spin-orbit interaction based mechanism to actively
+cool down the torsional vibration of a nanomechanical resonator made by
+semiconductor materials. We show that the spin-orbit interactions of electrons
+can induce a coherent coupling between the electron spins and the torsional
+modes of nanomechanical vibration. This coherent coupling leads to an active
+cooling for the torsional modes via the dynamical thermalization of the
+resonator and the spin ensemble.",0705.1964v1
+2009-02-19,Spin-orbit induced non-collinear spin structure in deposited transition metal clusters,"The influence of the spin-orbit coupling on the magnetic structure of
+deposited transition metal nanostructure systems has been studied by fully
+relativistic electronic structure calculations. The interplay of exchange
+coupling and magnetic anisotropy was monitored by studying the corresponding
+magnetic torque calculated within ab-initio and model approaches. It is found
+that a spin-orbit induced Dzyaloshinski-Moriya interaction can stabilise a
+non-collinear spin structure even if there is a pronounced isotropic
+ferromagnetic exchange interaction between the magnetic atoms.",0902.3336v1
+2013-08-25,Entanglement of spin-orbit qubits induced by Coulomb interaction,"Spin-orbit qubit (SOQ) is the dressed spin by the orbital degree of freedom
+through a strong spin-orbit coupling. We show that Coulomb interaction between
+two electrons in quantum dots located separately in two nanowires can
+efficiently induce quantum entanglement between two SOQs. The physical
+mechanism to achieve such quantum entanglement is based on the feasibility of
+the SOQ responding to the external electric field via an intrinsic electric
+dipole spin resonance.",1308.5387v1
+2009-01-19,Spin-orbit effect on electron-electron interaction and fine structure of electron complexes in quantum dots,"Spin-orbit effects on electron-electron interaction are studied
+theoretically. The corrections to the Coulomb interaction of quantum well
+electrons induced by the spin-orbit coupling are derived. The developed theory
+is applied to calculate the energy spectrum fine structure of an electron pair
+triplet states localized in small lateral disk-shaped quantum dots. We show
+that the spin degeneracy of a triplet state is completely lifted in anisotropic
+quantum dots. Isotropic quantum dots also demonstrate peculiar fine structure
+of triplet states caused by the spin-orbit interaction.",0901.2893v2
+2020-02-24,Phase diagram of the interacting persistent spin-helix state,"We study the phase diagram of the interacting two-dimensional electron gas
+(2DEG) with equal Rashba and Dresselhaus spin-orbit coupling, which for weak
+coupling gives rise to the well-known persistent spin-helix phase. We construct
+the full Hartree-Fock phase diagram using a classical Monte-Carlo method
+analogous to that used in Phys.Rev.B 96, 235425 (2017). For the 2DEG with only
+Rashba spin-orbit coupling, it was found that at intermediate values of the
+Wigner-Seitz radius rs the system is characterized by a single Fermi surface
+with an out-of-plane spin polarization, while at slightly larger values of rs
+it undergoes a transition to a state with a shifted Fermi surface and an
+in-plane spin polarization. The various phase transitions are first-order, and
+this shows up in discontinuities in the conductivity and the appearance of
+anisotropic resistance in the in-plane polarized phase. In this work, we show
+that the out-of-plane spin-polarized region shrinks as the strength of the
+Dresselhaus spin-orbit interaction increases, and entirely vanishes when the
+Rashba and Dresselhaus spin-orbit coupling strengths are equal. At this point,
+the system can be mapped onto a 2DEG without spin-orbit coupling, and this
+transformation reveals the existence of an in-plane spin-polarized phase with a
+single, displaced Fermi surface beyond rs > 2.01. This is confirmed by
+classical Monte-Carlo simulations. We discuss experimental observation and
+useful applications of the novel phase, as well as caveats of using the
+classical Monte-Carlo method.",2002.10036v1
+2007-04-02,Reexamination of spin decoherence in semiconductor quantum dots from equation-of-motion approach,"The longitudinal and transversal spin decoherence times, $T_1$ and $T_2$, in
+semiconductor quantum dots are investigated from equation-of-motion approach
+for different magnetic fields, quantum dot sizes, and temperatures. Various
+mechanisms, such as the hyperfine interaction with the surrounding nuclei, the
+Dresselhaus spin-orbit coupling together with the electron--bulk-phonon
+interaction, the $g$-factor fluctuations, the direct spin-phonon coupling due
+to the phonon-induced strain, and the coaction of the
+electron--bulk/surface-phonon interaction together with the hyperfine
+interaction are included. The relative contributions from these spin
+decoherence mechanisms are compared in detail. In our calculation, the
+spin-orbit coupling is included in each mechanism and is shown to have marked
+effect in most cases. The equation-of-motion approach is applied in studying
+both the spin relaxation time $T_1$ and the spin dephasing time $T_2$, either
+in Markovian or in non-Markovian limit. When many levels are involved at finite
+temperature, we demonstrate how to obtain the spin relaxation time from the
+Fermi Golden rule in the limit of weak spin-orbit coupling. However, at high
+temperature and/or for large spin-orbit coupling, one has to use the
+equation-of-motion approach when many levels are involved. Moreover, spin
+dephasing can be much more efficient than spin relaxation at high temperature,
+though the two only differs by a factor of two at low temperature.",0704.0148v5
+2016-11-20,"The influence of Coulomb Correlations and Spin-Orbit Coupling in the electronic structure of double perovskites Sr$_2$XOsO$_6$ (X$=$Sc, Mg)","We investigate the antiferromagnetic insulating state of the recently
+discovered double perovskites Sr$_2$XOsO$_6$ (X$=$Sc, Mg) by using ab-initio
+calculations (based on Density Functional Theory and Dynamical Mean-Field
+Theory) to elucidate the interplay between electronic correlations and
+spin-orbit coupling. The structural details of Sr$_2$XOsO$_6$ (X$=$Sc, Mg)
+induce band narrowing effects which enhance local electronic correlations. The
+half-filled $5d^3$ orbitals of Os in Sr$_2$ScOsO$_6$ fall into a magnetically
+ordered correlated regime, which is slightly affected and reduced by the
+spin-orbit coupling. The electronic configuration $5d^2$ of Os in
+Sr$_2$MgOsO$_6$ responses differently to electronic correlations promoting a
+less localized state than Sr$_2$ScOsO$_6$ at the same strength of electronic
+interactions. We find that the inclusion of spin-orbit coupling drives
+Sr$_2$MgOsO$_6$ toward insulating behaviour and promotes a large tendency in
+formation of orbital magnetization antiparallel to the spin moment. The
+formation of the AFM state is linked to the evidence of correlated Hubbard
+bands in the paramagnetic solution of Sr$_2$XOsO$_6$ (X$=$Sc, Mg).",1611.06482v1
+2016-05-10,Electric-field-induced interferometric resonance of a one-dimensional spin-orbit-coupled electron,"We consider a one-dimensional spin-orbit-coupled nanowire quantum dot, driven
+by external electric and magnetic fields, and theoretically formulate an
+electric mechanism to interfere its electron orbits. Owing to the existence of
+spin-orbit coupling and a pulsed electric field, different spin-orbit states
+are shown to interfere with each other, generating intriguing
+interference-resonant patterns. We also reveal that an in-plane magnetic field
+does not affect the strength interval of any neighboring resonant peaks, but
+contributes a weak shift of each peak, which is sensitive to the direction of
+the magnetic field. We find that this proposed external-field-controlled scheme
+should be regarded as a new type of quantum-dot-based interferometry. Finally,
+this interferometry has an important application in precisely measuring
+relative experimental parameters, such as the Rashba and Dresselhaus
+spin-orbit-coupling strengths, as well as the Lande-g factor.",1605.02871v3
+2016-05-20,The effect of gravitational spin-orbit coupling on the circular photon orbit in the Schwarzschild geometry,"The (1, 0)+(0, 1) representation of the group SL(2, C) provides a
+six-component spinor equivalent to the electromagnetic field tensor. By means
+of the (1, 0)+(0, 1) description, one can treat the photon field in curved
+spacetime via spin connection and the tetrad formalism, which is of great
+advantage to study the gravitational spin-orbit coupling of photons. Once the
+gravitational spin-orbit coupling is taken into account, the traditional radius
+of the circular photon orbit in the Schwarzschild geometry should be replaced
+with two different radiuses corresponding to the photons with the helicities of
++1 and -1, respectively. Owing to the splitting of energy levels induced by the
+spin-orbit coupling, photons (from Hawking radiations, say) escaping from a
+Schwarzschild black hole are partially polarized, provided that their initial
+velocities possess nonzero tangential components.",1605.06427v1
+2016-01-11,Theory of electronic and spin-orbit proximity effects in graphene on Cu(111),"We study orbital and spin-orbit proximity effects in graphene adsorbed to the
+Cu(111) surface by means of density functional theory (DFT). The proximity
+effects are caused mainly by the hybridization of graphene $\pi$ and copper d
+orbitals. Our electronic structure calculations agree well with the
+experimentally observed features. We carry out a graphene-Cu(111) distance
+dependent study to obtain proximity orbital and spin-orbit coupling parameters,
+by fitting the DFT results to a robust low energy model Hamiltonian. We find a
+strong distance dependence of the Rashba and intrinsic proximity induced
+spin-orbit coupling parameters, which are in the meV and hundreds of $\mu$eV
+range, respectively, for experimentally relevant distances. The Dirac spectrum
+of graphene also exhibits a proximity orbital gap, of about 20 meV.
+Furthermore, we find a band inversion within the graphene states accompanied by
+a reordering of spin and pseudospin states, when graphene is pressed towards
+copper.",1601.02445v1
+2018-05-15,Spin-orbit effects on the spin and pseudospin polarization in ac-driven silicene,"We study the pseudospin and spin dynamical effects in single-layer silicene
+due to a perpendicular electric field periodically driven and its interplay
+with the intrinsic and extrinsic (Rashba) spin-orbit interaction. We find that
+the spin nonconserving processes of the real spin of the quasiparticles in
+silicene, -- induced by the rather weak spin-orbit mechanisms --, manifest
+themselves as shifts of the resonances of its quasienergy spectrum in the low
+coupling regime to the driving field. We show that there is an interesting
+cooperative effect among the, in principle, competing Rashba and intrinsic
+spin-orbit contributions. This is explicitly illustrated by exact and
+approximated analytical solutions of the dynamical equations. In addition, we
+show that a finite Rashba spin-orbit interaction is indeed necessary in order
+to achieve a nonvanishing spin polarization. As additional feature, trivial and
+nontrivial topological phases might be distinguished from each other as fast or
+slow dynamical fluctuations of the spin polarization. We mention the possible
+experimental detection schemes of our theoretical results and their relevance
+in new practical implementation of periodically driven interactions in silicene
+physics and related two-dimensional systems.",1805.05833v1
+2020-06-14,Spin-orbit torque generated by amorphous Fe$_{x}$Si$_{1-x}$,"While tremendous work has gone into spin-orbit torque and spin current
+generation, charge-to-spin conversion efficiency remains weak in silicon to
+date, generally stemming from the low spin-orbit coupling (low atomic number,
+Z) and lack of bulk lattice inversion symmetry breaking. Here we report the
+observation of spin-orbit torque in an amorphous, non-ferromagnetic
+Fe$_{x}$Si$_{1-x}$ / cobalt bilayer at room temperature, using spin torque
+ferromagnetic resonance and harmonic Hall measurements. Both techniques provide
+a minimum spin torque efficiency of about 3 %, comparable to prototypical heavy
+metals such as Pt or Ta. According to the conventional theory of the spin Hall
+effect, a spin current in an amorphous material is not expected to have any
+substantial contribution from the electronic bandstructure. This, combined with
+the fact that Fe$_{x}$Si$_{1-x}$ does not contain any high-Z element, paves a
+new avenue for understanding the underlying physics of spin-orbit interaction
+and opens up a new class of material systems - silicides - that is directly
+compatible with complementary metal-oxide-semiconductor (CMOS) processes for
+integrated spintronics applications.",2006.07786v1
+2024-03-22,Orbital-doublet-driven even spin Chern insulators,"Quantum spin Hall insulators hosting edge spin currents hold great potential
+for low-power spintronic devices. In this work, we present a universal approach
+to achieve a high and near-quantized spin Hall conductance plateau within a
+sizable bulk gap. Using a nonmagnetic four-band model Hamiltonian, we
+demonstrate that an even spin Chern (ESC) insulator can be accessed by tuning
+the sign of spin-orbit coupling (SOC) within a crystal symmetry-enforced
+orbital doublet. With the assistance of a high spin Chern number of $C_{S}=2$
+and spin $U$(1) quasi-symmetry, this orbital-doublet-driven ESC phase is
+endowed with the near-double-quantized spin Hall conductance. We identify 12
+crystallographic point groups supporting such a sign-tunable SOC. Furthermore,
+we apply our theory to realistic examples, and show the phase transition from a
+trivial insulator governed by positive SOC in RuI$_{3}$ monolayer to an ESC
+insulator dominated by negative SOC in RuBr$_{3}$ monolayer. This
+orbital-doublet-driven ESC insulator, RuBr$_{3}$, showcases nontrivial
+characteristics including helical edge states, near-double-quantized spin Hall
+conductance, and robust corner states. Our work provides new pathways in the
+pursuit of the long-sought quantum spin Hall insulators.",2403.14893v1
+2008-03-17,Energy levels of a two-dimensional hydrogen atom with spin-orbit Rashba interaction,"Electronic bound states around charged impurities in two-dimensional systems
+with structural inversion asymmetry can be described in terms of a
+two-dimensional hydrogen atom in the presence of a Rashba spin-orbit
+interaction. Here, the energy levels of the bound electron are evaluated
+numerically as a function of the spin-orbit interaction, and analytic
+expressions for the weak and strong spin-orbit coupling limits are compared
+with the numerical results. It is found that, besides the level splitting due
+to the lack of inversion symmetry, the energy levels are lowered for
+sufficiently strong spin-orbit coupling, indicating that the electron gets more
+tightly bound to the ion as the spin-orbit interaction increases. Similarities
+and differences with respect to the two-dimensional Fr\""ohlich polaron with
+Rashba coupling are discussed.",0803.2416v1
+2014-01-08,Signatures of spin-orbit coupling in scanning gate conductance images of electron flow from quantum point contacts,"Electron flow through a quantum point contact in presence of spin-orbit
+coupling is investigated theoretically in the context of the scanning gate
+microscopy (SGM) conductance mapping. Although in the absence of the floating
+gate the spin-orbit coupling does not significantly alter the conductance, we
+find that the angular dependence of the SGM images of the electron flow at the
+conductance plateaux is substantially altered as the spin-orbit interaction
+mixes the orbital modes that enter the quantum point contact. The radial
+interference fringes that are obtained in the SGM maps at conductance steps are
+essentially preserved by the spin-orbit interaction as backscattering by the
+tip preserves the electron spin although the effects of the mode mixing are
+visible.",1401.1707v2
+2015-01-23,General framework for transport in spin-orbit-coupled superconducting heterostructures: Nonuniform spin-orbit coupling and spin-orbit-active interfaces,"Electronic spin-orbit coupling (SOC) is essential for various newly
+discovered phenomena in condensed-matter systems. In particular,
+one-dimensional topological heterostructures with SOC have been widely
+investigated in both theory and experiment for their distinct transport
+signatures indicating the presence of emergent Majorana fermions. However, a
+general framework for the SOC-affected transport in superconducting
+heterostructures, especially with the consideration of interfacial effects, has
+not been developed even regardless of the topological aspects. We hereby
+provide one for an effectively one-dimensional superconductor-normal
+heterostructure with nonuniform magnitude and direction of both Rashba and
+Dresselhaus SOC as well as a spin-orbit-active interface. We extend the
+Blonder-Tinkham-Klapwijk treatment to analyze the current-voltage relation and
+obtain a rich range of transport behaviors. Our work provides a basis for
+characterizing fundamental physics arising from spin-orbit interactions in
+heterostructures and its implications for topological systems, spintronic
+applications, and a whole variety of experimental setups.",1501.05699v2
+2023-07-09,Enhancement and anisotropy of electron Lande factor due to spin-orbit interaction in semiconductor nanowires,"We investigate the effective Lande factor in semiconductor nanowires with
+strong Rashba spin-orbit coupling. Using the $\mathbf{k}\cdot\mathbf{p}$ theory
+and the envelope function approach we derive a conduction band Hamiltonian
+where the tensor $g^*$ is explicitly related to the spin-orbit coupling
+constant $\alpha_R$. Our model includes orbital effects from the Rashba
+spin-orbit term, leading to a significant enhancement of the effective Lande
+factor which is naturally anisotropic. For nanowires based on the low-gap, high
+spin-orbit coupled material InSb, we investigate the anisotropy of the
+effective Lande factor with respect to the magnetic field direction, exposing a
+twofold symmetry for the bottom gate architecture. The anisotropy results from
+the competition between the localization of the envelope function and the spin
+polarization of the electronic state, both determined by the magnetic field
+direction.",2307.04265v2
+2024-03-22,Robust realization of electrically tunable spin-orbit locked vortex pairs in polariton condensates at room temperature,"Coupling of orbital and spin degrees of freedom gives rise to intriguing
+physical phenomena in bosonic condensates, such as formation of stripe phases
+and domains with vortex arrays. However, the robust locking of spin and orbital
+degrees of freedom of nonlinear topological objects such as vortices in bosonic
+condensates at room temperature remains challenging. In the present work, we
+realize a non-equilibrium room-temperature condensate in a liquid crystal (LC)
+planar photonic microcavity with the perovskite CsPbBr3 as optically active
+material. We use the interplay of TE-TM mode splitting and Rashba-Dresselhaus
+spin-orbit coupling (RDSOC) to realize electrically tunable polariton vortex
+pairs with locked spin and orbital angular momentum. Our results are robust
+against sample imperfections and pave the way to investigate coupling and
+locking of vortex orbital and spin degrees of freedom in a quantum fluid of
+light at room temperature, offering potential for generation of complex states
+of light for optical information processing with optoelectronic chips.",2403.15133v1
+2013-06-19,"Asymmetric Ferromagnetic Resonance, Universal Walker Breakdown, and Counterflow Domain Wall Motion in the Presence of Multiple Spin-Orbit Torques","We study the motion of several types of domain wall profiles in spin-orbit
+coupled magnetic nanowires and also the influence of spin-orbit interaction on
+the ferromagnetic resonance of uniform magnetic films. We extend previous
+studies by fully considering not only the field-like contribution from the
+spin-orbit torque, but also the recently derived Slonczewski-like spin-orbit
+torque. We show that the latter interaction affects both the domain wall
+velocity and the Walker breakdown threshold non-trivially, which suggests that
+it should be accounted in experimental data analysis. We find that the presence
+of multiple spin-orbit torques may render the Walker breakdown to be universal
+in the sense that the threshold is completely independent on the
+material-dependent Gilbert damping, non-adiabaticity, and the chirality of the
+domain wall. We also find that domain wall motion against the current injection
+is sustained in the presence of multiple spin-orbit torques and that the wall
+profile will determine the qualitative influence of these different types of
+torques (e.g. field-like and Slonczewski-like). In addition, we consider a
+uniform ferromagnetic layer under a current bias, and find that the resonance
+frequency becomes asymmetric against the current direction in the presence of
+Slonczewski-like spin-orbit coupling. This is in contrast with those cases
+where such an interaction is absent, where the frequency is found to be
+symmetric with respect to the current direction. This finding shows that
+spin-orbit interactions may offer additional control over pumped and absorbed
+energy in a ferromagnetic resonance setup by manipulating the injected current
+direction.",1306.4680v1
+2017-12-08,Spin Hall and spin swapping torques in diffusive ferromagnets,"A complete set of the generalized drift-diffusion equations for a coupled
+charge and spin dynamics in ferromagnets in the presence of extrinsic
+spin-orbit coupling is derived from the quantum kinetic approach, covering
+major transport phenomena, such as the spin and anomalous Hall effects, spin
+swapping, spin precession and relaxation processes. We argue that the spin
+swapping effect in ferromagnets is enhanced due to spin polarization, while the
+overall spin texture induced by the interplay of spin-orbital and spin
+precessional effects displays a complex spatial dependence that can be
+exploited to generate torques and nucleate/propagate domain walls in
+centrosymmetric geometries without use of external polarizers, as opposed to
+the conventional understanding of spin-orbit mediated torques.",1712.03009v1
+2021-09-05,Electric field effect on electron gas spins in two-dimensional magnets with strong spin-orbit coupling,"The recent rise of material platforms combining magnetism and
+two-dimensionality of mobile carriers reveals a diverse spectrum of spin-orbit
+phenomena and stimulates its ongoing theoretical discussions. In this work we
+use the density matrix approach to provide a unified description of subtle
+microscopic effects governing the electron gas spin behavior in the clean limit
+upon electric perturbations in two-dimensional magnets with strong spin-orbit
+coupling. We discuss that an inhomogeneity of electrostatic potential generally
+leads to the electron gas spin tilting with the subsequent formation of
+equilibrium skyrmion-like spin textures and demonstrate that several
+microscopic mechanisms of 2DEG spin response are equally important for this
+effect. We analyze the dynamics of 2DEG spin upon an oscillating electric field
+with a specific focus on the emergent electric dipole spin resonance. We
+address the resonant enhancement of magneto-optical phenomena from the spin
+precession equation perspective and discuss it in terms of the resonant spin
+generation. We also clarify the connection of both static and dynamic spin
+phenomena arising in response to a scalar perturbation with the electronic band
+Berry curvature.",2109.02151v1
+2021-10-05,Effective potentials in a rotating spin-orbit-coupled spin-1 spinor condensate,"We theoretically study the stationary-state vortex lattice configurations of
+rotating spin-orbit- and coherently-coupled spin-1 Bose-Einstein condensates
+trapped in quasi-two-dimensional harmonic potentials. The combined effects of
+rotation, spin-orbit and coherent couplings are analyzed systematically from
+the single-particle perspective. Through the single-particle Hamiltonian, which
+is exactly solvable for one-dimensional coupling, under specific coupling and
+rotation strengths, we illustrate that a boson in these rotating spin-orbit-
+and coherently-coupled condensates are subjected to effective toroidal,
+symmetric double-well, or asymmetric double-well potentials. In the presence of
+mean-field interactions, using the coupled Gross-Pitaevskii formalism at
+moderate to high rotation frequencies, the analytically obtained effective
+potential minima and the numerically obtained coarse-grained density maxima
+position are in excellent agreement. On rapid rotation, we further find that
+the spin expectation per particle of an antiferromagnetic spin-1 Bose-Einstein
+condensate approaches unity indicating a similarity in the response with
+ferromagnetic spin-orbit-coupled condensates.",2110.02185v3
+2013-12-11,Spin-orbit coupling and the static polarizability of single-wall carbon nanotubes,"We calculate the static longitudinal polarizability of single-wall carbon
+nanotubes in the long wavelength limit taking into account spin-orbit effects.
+We use a four-orbital orthogonal tight-binding formalism to describe the
+electronic states and the random phase approximation to calculate the
+dielectric function. We study the role of both the Rashba as well as the
+intrinsic spin-orbit interactions on the longitudinal dielectric response, i.e.
+when the probing electric field is parallel to the nanotube axis. The
+spin-orbit interaction modifies the nanotube electronic band dispersions, which
+may especially result in a small gap opening in otherwise metallic tubes. The
+bandgap size and state features, the result of competition between Rashba and
+intrinsic spin-orbit interactions, result in drastic changes in the
+longitudinal static polarizability of the system. We discuss results for
+different nanotube types, and the dependence on nanotube radius and spin-orbit
+couplings.",1312.3155v1
+2015-10-19,Role of local geometry in spin and orbital structure of transition metal compounds,"We analyze the role of local geometry in the spin and orbital interaction in
+transition metal compounds with orbital degeneracy. We stress that the tendency
+observed for the most studied case (transition metals in O$_6$ octahedra with
+one common oxygen -- common corner of neighboring octahedra and with $\sim
+180^{\circ}$ metal--oxygen--metal bonds), that ferro-orbital ordering renders
+antiferro-spin coupling, and, {\it vice versa}, antiferro-orbitals give
+ferro-spin ordering, is not valid in general case, in particular for octahedra
+with common edge and with $\sim 90^{\circ}$ M--O--M bonds. Special attention is
+paid to the ``third case'', neighboring octahedra with common face (three
+common oxygens) -- the case practically not considered until now, although
+there are many real systems with this geometry. Interestingly enough, the
+spin--orbital exchange in this case turns out to be to be simpler and more
+symmetric than in the first two cases. We also consider, which form the
+effective exchange takes for different geometries in case of strong spin--orbit
+coupling.",1510.05371v1
+2003-05-28,Spin splitting and precession in quantum dots with spin-orbit coupling: the role of spatial deformation,"Extending a previous work on spin precession in GaAs/AlGaAs quantum dots with
+spin-orbit coupling, we study the role of deformation in the external
+confinement. Small elliptical deformations are enough to alter the precessional
+characteristics at low magnetic fields. We obtain approximate expressions for
+the modified $g$ factor including weak Rashba and Dresselhaus spin-orbit terms.
+For more intense couplings numerical calculations are performed. We also study
+the influence of the magnetic field orientation on the spin splitting and the
+related anisotropy of the $g$ factor. Using realistic spin-orbit strengths our
+model calculations can reproduce the experimental spin-splittings reported by
+Hanson et al. (cond-mat/0303139) for a one-electron dot. For dots containing
+more electrons, Coulomb interaction effects are estimated within the
+local-spin-density approximation, showing that many features of the
+non-iteracting system are qualitatively preserved.",0305648v1
+2011-11-04,Spin Currents Induced by Nonuniform Rashba-Type Spin-Orbit Field,"We study the spin relaxation torque in nonmagnetic or ferromagnetic metals
+with nonuniform spin-orbit coupling within the Keldysh Green's function
+formalism. In non-magnet, the relaxation torque is shown to arise when the
+spin-orbit coupling is not uniform. In the absence of an external field, the
+spin current induced by the relaxation torque is proportional to the vector
+chirality of Rashba-type spin-orbit field (RSOF). In the presence of an
+external field, on the other hand, spin relaxation torque arises from the
+coupling of the external field and vector chirality of RSOF. Our result
+indicates that spin-sink or source effects are controlled by designing RSOF in
+junctions.",1111.1197v1
+2019-10-06,Spin-orbit coupling in the presence of strong atomic correlations,"We explore the influence of contact interactions on a synthetically
+spin-orbit coupled system of two ultracold trapped atoms. Even though the
+system we consider is bosonic, we show that a regime exists in which the
+competition between the contact and spin-orbit interactions results in the
+emergence of a ground state that contains a significant contribution from the
+anti-symmetric spin state. This ground state is unique to few-particle systems
+and does not exist in the mean-field regime. The transition to this state is
+signalled by an inversion in the average momentum from being dominated by
+centre-of-mass momentum to relative momentum and also affects the global
+entanglement shared between the real- and pseudo-spin spaces. Indeed,
+competition between the interactions can also result in avoided crossings in
+the groundstate which further enhances these correlations. However, we find
+that correlations shared between the pseudo-spin states are strongly depressed
+due to the spin-orbit coupling and therefore the system does not contain
+spin-spin entanglement.",1910.02399v2
+2009-06-09,Quantum criticality near the Stoner transition in a two-dot with spin-orbit coupling,"We study a system of two tunnel-coupled quantum dots, with the first dot
+containing interacting electrons (described by the Universal Hamiltonian) not
+subject to spin-orbit coupling, whereas the second contains non-interacting
+electrons subject to spin-orbit coupling. We focus on describing the behavior
+of the system near the Stoner transition. Close to the critical point quantum
+fluctuations become important and the system enters a quantum critical regime.
+The large-$N$ approximation allows us to calculate physical quantitites
+reliably even in this strongly fluctuating regime. In particular, we find a
+scaling function to describe the crossover of the quasiparticle decay rate
+between the renormalized Fermi liquid regime and the quantum critical regime.",0906.1838v1
+2010-04-23,Spin-orbit coupling and perpendicular Zeeman field for fermionic cold atoms: observation of the intrinsic anomalous Hall effect,"We propose a scheme for generating Rashba spin-orbit coupling and
+perpendicular Zeeman field simultaneously for cold fermionic atoms in a
+harmonic trap through the coupling between atoms and laser fields. The
+realization of Rashba spin-orbit coupling and perpendicular Zeeman field
+provides opportunities for exploring many topological phenomena using cold
+fermionic atoms. We focus on the intrinsic anomalous Hall effect and show that
+it may be observed through the response of atomic density to a rotation of the
+harmonic trap.",1004.4231v3
+2011-12-27,Synthetic 3D Spin-Orbit Coupling,"We describe a method for creating a three-dimensional analogue to Rashba
+spin-orbit coupling in systems of ultracold atoms. This laser induced coupling
+uses Raman transitions to link four internal atomic states with a tetrahedral
+geometry, and gives rise to a Dirac point that is robust against environmental
+perturbations. We present an exact result showing that such a spin-orbit
+coupling in a fermionic system always rise to a molecular bound state.",1112.6022v2
+2012-07-23,Synthetic spin-orbit coupling in ultracold $Λ$-type atoms,"We consider the simulation of non-abelian gauge potentials in ultracold atom
+systems with atom-field interaction in the $\Lambda$ configuration where two
+internal states of an atom are coupled to a third common one with a detuning.
+We find the simulated non-abelian gauge potentials can have the same structures
+as those simulated in the tripod configuration if we parameterize Rabi
+frequencies properly, which means we can design spin-orbit coupling simulation
+schemes based on those proposed in the tripod configuration. We show the
+simulated spin-orbit coupling in the $\Lambda$ configuration can only be of a
+form similar to $p_{x}\sigma_{y}$ even when the Rabi frequencies are not much
+smaller than the detuning.",1207.5369v1
+2013-06-28,Quantum quasicrystals of spin-orbit coupled dipolar bosons,"We study quasi-two-dimensional dipolar Bose gases in which the bosons
+experience a Rashba spin-orbit coupling. We show that the degenerate dispersion
+minimum due to the spin-orbit coupling, combined with the long-range dipolar
+interaction, can stabilize a number of quantum crystalline and quasicrystalline
+ground states. Coupling the bosons to a fermionic species can further stabilize
+these phases. We estimate that the crystalline and quasicrystalline phases
+should be detectable in realistic dipolar condensates, e.g., dysprosium, and
+discuss their symmetries and excitations.",1307.0002v2
+2014-12-12,Tunable Spin-Orbit Coupling via Strong Driving in Ultracold Atom Systems,"Spin-orbit coupling (SOC) is an essential ingredient in topological
+materials, conventional and quantum-gas based alike.~Engineered spin-orbit
+coupling in ultracold atom systems --unique in their experimental control and
+measurement opportunities-- provides a major opportunity to investigate and
+understand topological phenomena.~Here we experimentally demonstrate and
+theoretically analyze a technique for controlling SOC in a two component
+Bose-Einstein condensate using amplitude-modulated Raman coupling.",1412.4064v1
+2016-06-24,Topological quantum phase transition driven by anisotropic spin-orbit coupling in trinuclear organometallic coordination crystals,"We show how quasi-one-dimensional correlated insulating states arise at
+two-thirds filling in organometallic multinuclear coordination complexes
+described by layered decorated honeycomb lattices. The interplay of spin-orbit
+coupling and electronic correlations leads to pseudospin-1 moments arranged in
+weakly coupled chains with highly anisotropic exchange and a large trigonal
+splitting. This leads to a quantum phase transition from a Haldane phase to a
+topologically trivial phase as the relative strength of the spin-orbit coupling
+increases.",1606.07691v1
+2014-12-08,Theory of Weyl orbital semimetals and predictions of several materials classes,"Graphene, topological insulators, and Weyl semimetals are three widely
+studied materials classes which possess Dirac or Weyl cones arising from either
+sublattice symmetry or spin-orbit coupling. In this work, we present a theory
+of a new class of bulk Dirac and Weyl cones, dubbed Weyl orbital semimetals,
+where the orbital polarization and texture inversion between two electronic
+states at discrete momenta lend itself into protected Dirac or Weyl cones
+without spin-orbit coupling. We also predict several families of Weyl orbital
+semimetals including V$_3$S$_4$, NiTi3S6, BLi, and PbO$_2$ via first-principle
+band structure calculations. We find that the highest Fermi velocity predicted
+in some of these materials is even larger than that of the existing Dirac
+materials. The synthesis of Weyl orbital semimetals will not only expand the
+territory of Dirac materials beyond the quintessential spin-orbit coupled
+systems and hexagonal lattice to the entire periodic table, but it may also
+open up new possibilities for orbital controlled electronics or `orbitronics'.",1412.2607v2
+2011-03-16,Spin relaxation in Rashba rings,"Spin relaxation dynamics in rings with Rashba spin-orbit coupling is
+investigated using spin kinetic equation. We find that the spin relaxation in
+rings occurs toward a persistent spin configuration whose final shape depends
+on the initial spin polarization profile. As an example, it is shown that a
+homogeneous parallel to the ring axis spin polarization transforms into a
+persistent crown-like spin structure. It is demonstrated that the ring geometry
+introduces a geometrical contribution to the spin relaxation rate speeding up
+the transient dynamics. Moreover, we identify several persistent spin
+configurations as well as calculate the Green function of spin kinetic
+equation.",1103.3231v1
+2015-06-03,"Synchronization of spin-transfer torque oscillators by spin pumping, inverse spin Hall, and spin Hall effects","We have proposed a method to synchronize multiple spin-transfer torque
+oscillators based on spin pumping, inverse spin Hall, and spin Hall effects.
+The proposed oscillator system consists of a series of nano-magnets in junction
+with a normal metal with high spin-orbit coupling, and an accumulative feedback
+loop. We conduct simulations to demonstrate the effect of modulated charge
+currents in the normal metal due to spin pumping from each nano-magnet. We show
+that the interplay between the spin Hall effect and inverse spin Hall effect
+results in synchronization of the nano-magnets.",1506.01357v1
+2015-08-07,Rashbon bound states associated with a spherical spin-orbit coupling in an ultracold Fermi gas with an $s$-wave interaction,"We investigate the formation of rashbon bound states and strong-coupling
+effects in an ultracold Fermi gas with a spherical spin-orbit interaction,
+$H_{\rm so}=\lambda{\bf p}\cdot{\bf \sigma}$ (where ${\bf
+\sigma}=(\sigma_x,\sigma_y,\sigma_z)$ are Pauli matrices). Extending the
+strong-coupling theory developed by Nozi\`eres and Schmitt-Rink (NSR) to
+include this spin-orbit coupling, we determine the superfluid phase transition
+temperature $T_{\rm c}$, as functions of the strength of a pairing interaction
+$U_s$, as well as the spin-orbit coupling strength $\lambda$. Evaluating poles
+of the NSR particle-particle scattering matrix describing fluctuations in the
+Cooper channel, we clarify the region where rashbon bound states dominate the
+superfluid phase transition in the $U_{s}$-$\lambda$ phase diagram. Since the
+antisymmetric spin-orbit interaction $H_{\rm so}$ breaks the inversion symmetry
+of the system, rashbon bound states naturally have, not only a spin-singlet and
+even-parity symmetry, but also a spin-triplet and odd-parity symmetry. Thus,
+our results would be also useful for the study of this parity mixing effect in
+the BCS-BEC crossover regime of a spin-orbit coupled Fermi gas.",1508.01673v1
+2014-09-03,Theory of coupled spin-charge transport due to spin-orbit interaction in inhomogeneous two-dimensional electron liquids,"Spin-orbit interactions in two-dimensional electron liquids are responsible
+for many interesting transport phenomena in which particle currents are
+converted to spin polarizations and spin currents and viceversa. Prime examples
+are the spin Hall effect, the Edelstein effect, and their inverses. By similar
+mechanisms it is also possible to partially convert an optically induced
+electron-hole density wave to a spin density wave and viceversa. In this paper
+we present a unified theoretical treatment of these effects based on quantum
+kinetic equations that include not only the intrinsic spin-orbit coupling from
+the band structure of the host material, but also the spin-orbit coupling due
+to an external electric field and a random impurity potential. The
+drift-diffusion equations we derive in the diffusive regime are applicable to a
+broad variety of experimental situations, both homogeneous and non-homogeneous,
+and include on equal footing ""skew scattering"" and ""side-jump"" from
+electron-impurity collisions. As a demonstration of the strength and usefulness
+of the theory we apply it to the study of several effects of current
+experimental interest: the inverse Edelstein effect, the spin-current swapping
+effect, and the partial conversion of an electron-hole density wave to a spin
+density wave in a two-dimensional electron gas with Rashba and Dresselhaus
+spin-orbit couplings, subject to an electric field.",1409.1202v1
+2023-01-24,Longitudinal coupling between electrically driven spin-qubits and a resonator,"At the core of the semiconducting spin qubits success is the ability to
+manipulate them electrically, enabled by the spin-orbit interactions. However,
+most implementations require external magnetic fields to define the spin qubit,
+which in turn activate various charge noise mechanisms. Here we study spin
+qubits confined in quantum dots at zero magnetic fields, that are driven
+periodically by electrical fields and are coupled to a microwave resonator.
+Using Floquet theory, we identify a well-defined Floquet spin-qubit originating
+from the lowest degenerate spin states in the absence of driving. We find both
+transverse and longitudinal couplings between the Floquet spin qubit and the
+resonator, which can be selectively activated by modifying the driving
+frequency. We show how these couplings can facilitate fast qubit readout and
+the implementation of a two-qubit CPHASE gate. Finally, we use adiabatic
+perturbation theory to demonstrate that the spin-photon couplings originate
+from the non-Abelian geometry of states endowed by the spin-orbit interactions,
+rendering these findings general and applicable to a wide range of solid-state
+spin qubits.",2301.10163v1
+2019-05-08,Study of edge states and conductivity in spin-orbit coupled bilayer graphene,"We present an elaborate and systematic study of the conductance properties of
+a zigzag bilayer graphene nanoribbon modeled by a Kane-Mele (KM) Hamiltonian.
+The interplay of the Rashba and the intrinsic spin-orbit couplings with the
+edge states, electronic band structures, charge and spin transport are explored
+in details. We have analytically derived the conditions for the edge states for
+a bilayer KM nanoribbon and show how these modes decay for lattice sites inside
+the bulk. It is particularly interesting to note that for a finite-size ribbon
+an even number of zigzag ribbon hosts a finite energy gap at the Dirac points,
+while the odd ones do not. This asymmetry is present both in presence and
+absence of a bias voltage that may exist between the layers. The interlayer
+Rashba spin-orbit coupling, along with the intralayer intrinsic spin-orbit and
+intralayer Rashba spin-orbit couplings seem to destroy the quantum spin Hall
+(QSH) phase where the QSH phase is identified by the presence of a conductance
+plateau (of magnitude 4e/h) in the vicinity of zero Fermi energy. The plateau
+is sensitive to the values of the spin-orbit coupling parameters. Further, the
+spin polarized conductance data reveal that a bilayer KM ribbon is found to be
+more efficient for spintronic applications compared to a monolayer graphene.
+Finally, a quick check with experiments is done via computing the effective
+mass of electrons.",1905.03167v1
+2005-12-29,Theory of phonon-induced spin relaxation in laterally coupled quantum dots,"Phonon-induced spin relaxation in coupled lateral quantum dots in the
+presence of spin-orbit coupling is calculated. The calculation for single dots
+is consistent with experiment. Spin relaxation in double dots at useful
+interdot couplings is dominated by spin hot spots that are strongly
+anisotropic. Spin hot spots are ineffective for a diagonal crystallographic
+orientation of the dots with a transverse in-plane field. This geometry is
+proposed for spin-based quantum information processing.",0512713v2
+2023-02-06,Probing type-II Ising pairing using the spin-mixing parameter,"The immunity of Ising superconductors to external magnetic fields originates
+from a spin locking of the paired electrons to an intrinsic Zeeman-like field.
+The spin-momentum locking in non-centrosymmetric crystalline materials leads to
+type-I Ising pairing in which the direction of the intrinsic field can be
+deduced from the spin expectation values. Conversely, in centrosymmetric
+crystals the electron spins locked to the orbitals can form Ising type-II pairs
+consisting of spin-orbit split doublets. Due to time-reversal symmetry, the
+doublets are spin degenerate, making it difficult to read the spin polarization
+of bands and the direction of spin-orbit fields. Here we present an efficient
+approach to determine the direction of the intrinsic field using the
+spin-mixing parameter $b^2$. Using first principles calculations based on the
+density functional theory, we study monolayer transition metal dichalcogenide
+superconductors PdTe$_2$, NbTe$_2$, and TiSe$_2$ with the 1T structure. We
+calculate $b^2$ for individual Fermi pockets and provide a general picture of
+possible Ising type-II pairing within the full Brillouin zone. In order to
+complement our first principles results, we use group theory to provide a
+detailed picture of spin-orbit coupling and spin mixing in the relevant bands
+forming Fermi pockets. We demonstrate that contrary to the anticipated effects
+of spin-orbit locking, not every spin-orbit split spin doublet actively
+participates in Ising pairing. Finally, by connecting the spin-mixing parameter
+$b^2$ with the intrinsic out-of-plane Zeeman field we estimate the upper
+in-plane critical magnetic field.",2302.02699v2
+2005-08-19,Influence of spin-orbit interaction on quantum cascade transitions,"We have investigated the effect of spin-orbit (SO) coupling on the emission
+spectra of a quantum cascade laser. In an externally applied magnetic field
+parallel to the electron plane, the SO coupling would result in a double-peak
+structure of the optical spectra. This structure can be observed within some
+interval of magnetic fields and only for diagonal optical transitions when the
+SO coupling is different in different quantum wells.",0508473v1
+2014-03-10,Orbit Maneuver of Spinning Tether via Tidal Force,"Recently, the spinning tethered system is regarded as a typical and
+fundamental space structure attracting great interest of the aerospace
+engineers, and has been discussed primarily for specific space missions in past
+decades, including on-orbit capture and propellantless orbit transfer etc. The
+present work studies the dynamical behaviours of a fast spinning tethered
+binary system under central gravitational field, and derives principles of the
+basic laws of orbital maneuver. Considering the characteristics of coupled
+librational and orbital motions, an averaging method is introduced to deal with
+the slow-fast system equation, thus a definite equivalent model is derived. The
+general orbit motion is completely determined analytically, including the orbit
+geometry, periodicity, conversations and moving region etc. Since the
+possibility of orbit control using tether reaction has been proved by previous
+studies, special attention is paid to the transportation mode of angular
+momentum and mechanical energy between the orbit and libration. The effect of
+tether length change on the orbit shape is verified both in the averaged model
+and original model. The results show the orbit angular momentum and mechanical
+energy can be controlled independently, and the operating principles of tether
+reactions are derived for special modification of orbit shape.",1403.2221v1
+2023-09-26,Orbital Pumping by Magnetization Dynamics in Ferromagnets,"We show that dynamics of the magnetization in ferromagnets can pump the
+orbital angular momentum, which we denote by orbital pumping. This is the
+reciprocal phenomenon to the orbital torque that induces magnetization dynamics
+by the orbital angular momentum in non-equilibrium. The orbital pumping is
+analogous to the spin pumping established in spintronics but requires the
+spin-orbit coupling for the orbital angular momentum to interact with the
+magnetization. We develop a formalism that describes the generation of the
+orbital angular momentum by magnetization dynamics within the adiabatic
+perturbation theory. Based on this, we perform first-principles calculation of
+the orbital pumping in prototypical $3d$ ferromagnets, Fe, Co, and Ni. The
+results show that the ratio between the orbital pumping and the spin pumping
+ranges from 5 to 15 percents, being smallest in Fe and largest in Ni. This
+implies that ferromagnetic Ni is a good candidate for measuring the orbital
+pumping. Implications of our results on experiments are also discussed.",2309.14817v2
+2014-04-04,Observation of inverse spin Hall effect in bismuth selenide,"Bismuth Selenide (Bi2Se3) is a topological insulator exhibiting helical spin
+polarization and strong spin-orbit coupling. The spin-orbit coupling links the
+charge current to spin current via the spin Hall effect (SHE). We demonstrate a
+Bi2Se3 spin detector by injecting the pure spin current from a magnetic
+permalloy layer to a Bi2Se3 thin film and detect the inverse SHE in Bi2Se3. The
+spin Hall angle of Bi2Se3 is found to be 0.0093 and the spin diffusion length
+in Bi2Se3 to be 6.2 nm at room temperature. Our results suggest that
+topological insulators with strong spin-orbit coupling can be used in
+functional spintronic devices.",1404.1146v2
+2014-09-05,Room temperature spin thermoelectrics in metallic films,"Considering metallic films at room temperature, we present the first
+theoretical study of the spin Nernst and thermal Edelstein effects which takes
+into account dynamical spin-orbit coupling, i.e., direct spin-orbit coupling
+with the vibrating lattice (phonons) and impurities. This gives rise to two
+novel processes, namely a dynamical Elliott-Yafet spin relaxation and a
+dynamical side-jump mechanism. Both are the high-temperature counterparts of
+the well-known $T = 0$ Elliott-Yafet and side-jump, central to the current
+understanding of the spin Hall, spin Nernst and Edelstein effects at low $T$.
+We consider the experimentally relevant regime $T > T_D$, with $T_D$ the Debye
+temperature, as the latter is lower than room temperature in transition metals
+such as Pt, Au and Ta typically employed in spin injection/extraction
+experiments. We show that the interplay between intrinsic (Bychkov-Rashba type)
+and extrinsic (dynamical) spin-orbit coupling yields a nonlinear $T$-
+dependence of the spin Nernst and spin Hall conductivities.",1409.1809v1
+2018-05-28,A spin dephasing mechanism mediated by the interplay between the spin-orbit coupling and the asymmetrical confining potential in semiconductor quantum dot,"Understanding the spin dephasing mechanism is of fundamental importance in
+all potential applications of the spin qubit. Here we demonstrate a spin
+dephasing mechanism in semiconductor quantum dot due to the $1/f$ charge noise.
+The spin-charge interaction is mediated by the interplay between the spin-orbit
+coupling and the asymmetrical quantum dot confining potential. The dephasing
+rate is proportional to both the strength of the spin-orbit coupling and the
+degree of the asymmetry of the confining potential. For parameters typical of
+the InSb, InAs, and GaAs quantum dots with a moderate well-height $V_{0}=10$
+meV, we find the spin dephasing times are ${\rm T}^{*}_{2}=7$ $\mu$s, $275$
+$\mu$s, and $55$ ms, respectively. In particular, the spin dephasing can be
+enhanced by lowering the well-height. When the well-height is as small as
+$V_{0}=5$ meV, the spin depahsing times in the InSb, InAs, and GaAs quantum
+dots are decreased to ${\rm T}^{*}_{2}=0.38$ $\mu$s, $18$ $\mu$s, and $9$ ms,
+respectively.",1805.10792v2
+2019-12-10,Spin-relaxation times exceeding seconds for color centers with strong spin-orbit coupling in SiC,"Spin-active color centers in solids show good performance for quantum
+technologies. Several transition-metal defects in SiC offer compatibility with
+telecom and semiconductor industries. However, whether their strong spin-orbit
+coupling degrades their spin lifetimes is not clear. We show that a combination
+of a crystal-field with axial symmetry and spin-orbit coupling leads to a
+suppression of spin-lattice and spin-spin interactions, resulting in remarkably
+slow spin relaxation. Our optical measurements on an ensemble of Mo impurities
+in SiC show a spin lifetime $T_1$ of $2,4$ s at $2$ K.",1912.04612v1
+2023-09-26,Spin-photon interaction in a nanowire quantum dot with asymmetrical confining potential,"The electron (hole) spin-photon interaction is studied in an asymmetrical
+InSb (Ge) nanowire quantum dot. The spin-orbit coupling in the quantum dot
+mediates not only a transverse spin-photon interaction, but also a longitudinal
+spin-photon interaction due to the asymmetry of the confining potential. Both
+the transverse and the longitudinal spin-photon interactions have non-monotonic
+dependence on the spin-orbit coupling. For realistic spin-orbit coupling in the
+quantum dot, the longitudinal spin-photon interaction is much (at least one
+order) smaller than the transverse spin-photon interaction. The order of the
+transverse spin-photon interaction is about 1 nm in terms of length $|z_{eg}|$,
+or 0.1 MHz in terms of frequency $eE_{0}|z_{eg}|/h$ for a moderate cavity
+electric field strength $E_{0}=0.4$ V/m.",2309.14693v2
+2024-04-08,Quantum Spin Liquids in Weak Mott Insulators with a Spin-Orbit Coupling,"The weak Mott insulating regime of the triangular lattice Hubbard model
+exhibits a rich magnetic phase diagram as a result of the ring exchange
+interaction in the spin Hamiltonian. These phases include the Kalmeyer-Laughlin
+type chiral spin liquid (CSL) and a valence bond solid (VBS). A natural
+question arises regarding the robustness of these phases in the presence of a
+weak spin-orbit coupling (SOC). In this study, we derive the effective spin
+model for the spin-orbit coupled triangular lattice Hubbard model in the weak
+Mott insulting regime, including all SOC-mediated spin-bilinears and
+ring-exchange interactions. We then construct a simplified spin model keeping
+only the most relevant SOC-mediated spin interactions. Using infinite density
+matrix renormalization group (iDMRG) we show that the CSL and VBS phases of the
+triangular lattice Hubbard model can be stabilized in the presence of a weak
+SOC. The stabilization results from a compensation between the
+Dzyaloshinskii-Moriya interaction and a SOC-mediated ring exchange interaction.
+We also provide additional qualitative arguments to intuitively understand the
+compensation mechanism in the iDMRG quantum phase diagrams. This mechanism for
+stabilization can potentially be useful for the experimental realization of
+quantum spin liquids.",2404.05806v1
+2018-02-01,Phase separation and hidden vortices induced by spin-orbit coupling in spin-1 Bose-Einstein condensates,"We investigate phase separation and hidden vortices in spin-orbit coupled
+ferromagnetic BoseEinstein condensates with rotation and Rabi coupling. The
+hidden vortices are invisible in density distribution but are visible in phase
+distribution, which can carry angular momentum like the ordinary quantized
+vortices. In the absence of the rotation, we observe the phase separation
+induced by the spin-orbit coupling and determine the entire phase diagram of
+the existence of phase separation. For the rotation case, in addition to the
+phase separation, we demonstrate particularly that the spin-orbit coupling can
+result in the hidden vortices and hidden vortex-antivortex pairs. The
+corresponding entire phase diagrams are determined, depending on the interplay
+of the spin-orbit coupling strength, the rotation frequency, and Rabi
+frequency, which reveals the critical condition of the occurrence of the hidden
+vortices and vortex-antivortex pairs. The hidden vortices here are proved to be
+long-lived in the time scale of experiment by the dynamic analysis. These
+findings not only provide a clear illustration of the phase separation in
+spin-orbit coupled spinor Bose-Einstein condensates, but also open a new
+direction for investigating the hidden vortices in high-spin quantum system.",1802.00138v1
+2006-09-19,Large spin-orbit effects in small quantum dots,"We consider small ballistic quantum dots weakly coupled to the leads in the
+chaotic regime and look for significant spin-orbit effects. We find that these
+effects can become quite prominent in the vicinity of degeneracies of many-body
+energies. We illustrate the idea by considering a case where the intrinsic
+exchange term -JS^2 brings singlet and triplet many-body states near each
+other, while an externally tunable Zeeman term then closes the gap between the
+singlet and the one of the triplet states (with spin projection parallel the
+external field). Near this degeneracy, the spin-orbit coupling leads to a
+striking temperature dependence of the conductance, with observable effects of
+order unity at temperatures lower than the strength of the spin-orbit coupling.
+Under favorable circumstances, spelled out in the paper, these order unity
+effects in the conductance persist to temperatures much higher than the
+spin-orbit coupling strength. Our conclusions are unaffected by the presence of
+non-universal perturbations. We suggest a class of experiments to explore this
+regime.",0609460v1
+2016-10-05,Effect of disorder on superconductivity and Rashba spin-orbit coupling in LaAlO3/SrTiO3 interfaces,"A rather unique feature of the two-dimensional electron gas (2-DEG) formed at
+the interface between the two insulators LaAlO3 and SrTiO3 is to host both
+gate-tunable superconductivity and strong spin-orbit coupling. In the present
+work, we use the disorder generated by Cr substitution of Al atoms in LaAlO3 as
+a tool to explore the nature of superconductivity and spin-orbit coupling in
+these interfaces. A reduction of the superconducting Tc is observed with Cr
+doping consistent with an increase of electron-electron interaction in presence
+of disorder. In addition, the evolution of spin-orbit coupling with gate
+voltage and Cr doping suggests a D'Yakonov-Perel mechanism of spin relaxation
+in the presence of a Rashba-type spin-orbit interaction.",1610.01380v1
+2016-12-09,Spin-orbit coupling in {Mo$_3$S$_7$(dmit)$_3$},"Spin-orbit coupling in crystals is known to lead to unusual direction
+dependent exchange interactions, however understanding of the consequeces of
+such effects in molecular crystals is incomplete. Here we perform four
+component relativistic density functional theory computations on the
+multi-nuclear molecular crystal {Mo$_3$S$_7$(dmit)$_3$} and show that both
+intra- and inter-molecular spin-orbit coupling are significant. We determine a
+long-range relativistic single electron Hamiltonian from first principles by
+constructing Wannier spin-orbitals. We analyse the various contributions
+through the lens of group theory. Intermolecular spin-orbit couplings like
+those found here are known to lead to quantum spin-Hall and topological
+insulator phases on the 2D lattice formed by the tight-binding model predicted
+for a single layer of {Mo$_3$S$_7$(dmit)$_3$}.",1612.02929v1
+2017-11-15,Kondo temperature of Anderson impurity model in a quantum wire with spin-orbit coupling,"We use two different methods, the Hirsch-Fye quantum Monte Carlo simulation
+and the slave-boson mean field analysis to estimate the effect of spin-orbit
+coupling on the Kondo temperature in a quantum wire. In quantum Monte Carlo
+simulation, we calculate the product of spin susceptibility and temperature for
+different spin-orbit couplings and impurity energies. The variation of the
+Kondo temperature is estimated via the low temperature universal curves. In the
+mean field analysis, the Kondo temperature is estimated as the condensation
+temperature of slave-boson. Both the two methods demonstrate that the Kondo
+temperature is almost a linear function of the spin-orbit energy, and that the
+Kondo temperature is suppressed by the spin-orbit coupling. Our results are
+dramatically different from those given by the perturbative renormalization
+group analysis.",1711.05505v1
+2015-12-09,Spectrum of a family of spin-orbit coupled Hamiltonians with singular perturbation,"The present study is the first such attempt to examine rigorously and
+comprehensively the spectral properties of a three-dimensional ultracold atom
+when both the spin-orbit interaction and the Zeeman field are taken into
+account. The model operator is the Rashba spin-orbit coupled operator in
+dimension three. The self-adjoint extensions are constructed using the theory
+of singular perturbations, where regularized rank two perturbations describe
+spin-dependent contact interactions. The spectrum of self-adjoint extensions is
+investigated in detail laying emphasis on the effects due to spin-orbit
+coupling. When the spin-orbit-coupling strength is small enough, the
+asymptotics of eigenvalues is obtained. The conditions for the existence of
+eigenvalues above the threshold are discussed in particular.",1512.02833v1
+2023-05-18,Proximity spin-orbit coupling in an armchair carbon nanotube on monolayer bismuthene,"We study spin-orbit proximity effects in a hybrid heterostructure build of a
+one-dimensional (1D) armchair carbon nanotube and two-dimensional (2D) buckled
+monolayer bismuthene. We show, by performing first-principles calculations,
+that Dirac electrons in the nanotube exhibit large spin-orbit coupling due to a
+close vicinity of bismuthene. The calculated low-energy band structures of the
+proximized nanotube display a strong dependence on the position of the nanotube
+on the substrate, similar to twist-angle dependence found in 2D
+heterostructures. Based on the first-principles results, we formulate an
+effective low-energy Hamiltonian of the nanotube and identify key interactions
+governing the proximity spin-orbit coupling. The proximity-induced spin
+splitting of Dirac cone bands is in meV range, confirming an efficient transfer
+of spin-orbit coupling from bismuthene to the nanotube.",2305.10902v1
+2005-05-16,Magnetic flux induced spin polarization in semiconductor multichannel rings with Rashba spin orbit coupling,"We show that a finite magnetic flux threading a multichannel semiconductor
+ring induces spin accumulation at the borders of the sample when the Rashba
+spin-orbit interaction is taken into account even in the absence of external
+electric fields.",0505394v1
+2013-03-21,Anisotropic quantum transport in monolayer graphene in the presence of Rashba spin-orbit coupling,"We have studied spin-depend electron tunnelling through the Rashba barrier in
+a monolayer graphene lattice. The transfer matrix method, have been employed to
+obtain the spin dependent transport properties of the chiral particles. It is
+shown that graphene sheets in presence of Rashba spin-orbit barrier will act as
+an electron spin- inverter.",1303.5209v1
+2012-09-03,Dynamical Jahn-Teller Effect in Spin-Orbital Coupled System,"Dynamical Jahn-Teller (DJT) effect in a spin-orbital coupled system on a
+honeycomb lattice is examined, motivated from recently observed spin-liquid
+behavior in Ba$_3$CuSb$_2$O$_9$. An effective vibronic Hamiltonian, where the
+superexchange interaction and the DJT effect are taken into account, is
+derived. We find that the DJT effect induces a spin-orbital resonant state
+where local spin-singlet states and parallel orbital configurations are
+entangled with each other. This spin-orbital resonant state is realized in
+between an orbital ordered state, where spin-singlet pairs are localized, and
+an antiferromagnetic ordered state. Based on the theoretical results, a
+possible scenario for Ba$_3$CuSb$_2$O$_9$ is proposed.",1209.0239v2
+2003-12-24,Dynamic generation of spin orbit coupling,"Spin-orbit coupling plays an important role in determining the properties of
+solids, and is crucial for spintronics device applications. Conventional
+spin-orbit coupling arises microscopically from relativistic effects described
+by the Dirac equation, and is described as a single particle band effect. In
+this work, we propose a new mechanism in which spin-orbit coupling can be
+generated dynamically in strongly correlated, non-relativistic systems as the
+result of fermi surface instabilities in higher angular momentum channels.
+Various known forms of spin-orbit couplings can emerge in these new phases, and
+their magnitudes can be continuously tuned by temperature or other quantum
+parameters.",0312632v4
+2014-03-06,The evolution of magnetic structure driven by a synthetic spin-orbit coupling in two-component Bose-Hubbard model,"We study the evolution of magnetic structure driven by a synthetic spin-orbit
+coupling in a one-dimensional two-component Bose-Hubbard model. In addition to
+the Mott insulator-superfluid transition, we found in Mott insulator phases a
+transition from a gapped ferromagnetic phase to a gapless chiral phase by
+increasing the strength of spin-orbit coupling. Further increasing the
+spin-orbit coupling drives a transition from the gapless chiral phase to a
+gapped antiferromagnetic phase. These magnetic structures persist in superfluid
+phases. In particular, in the chiral Mott insulator and chiral superfluid
+phases, incommensurability is observed in characteristic correlation functions.
+These unconventional Mott insulator phase and superfluid phase demonstrate the
+novel effects arising from the competition between the kinetic energy and the
+spin-orbit coupling.",1403.1316v2
+2017-01-07,Chiral Supersolid in Spin-Orbit-Coupled Bose Gases with Soft-Core Long-Range Interactions,"Chirality represents a kind of symmetry breaking characterized by the
+noncoincidence of an object with its mirror image and has been attracting
+intense attention in a broad range of scientific areas. The recent realization
+of spin-orbit coupling in ultracold atomic gases provides a new perspective to
+study quantum states with chirality. In this Letter, we demonstrate that the
+combined effects of spin-orbit coupling and interatomic soft-core long-range
+interaction can induce an exotic supersolid phase in which the chiral symmetry
+is broken with spontaneous emergence of circulating particle current. This
+implies that a finite angular momentum can be generated with neither rotation
+nor effective magnetic field. The direction of the angular momentum can be
+altered by adjusting the strength of spin-orbit coupling or interatomic
+interaction. The predicted chiral supersolid phase can be experimentally
+observed in Rydberg-dressed Bose-Einstein condensates with spin-orbit coupling.",1701.01869v4
+2007-03-22,Electron-phonon effects on spin-orbit split bands of two dimensional systems,"The electronic self-energy is studied for a two dimensional electron gas
+coupled to a spin-orbit Rashba field and interacting with dispersionless
+phonons. For the case of a momentum independent electron-phonon coupling
+(Holstein model) we solve numerically the self-consistent non-crossing
+approximation for the self-energy and calculate the electron mass enhancement
+$m^*/m$ and the spectral properties. We find that, even for nominal weak
+electron-phonon interaction, for strong spin-orbit couplings the electrons
+behave as effectively strongly coupled to the phonons. We interpret this result
+by a topological change of the Fermi surface occurring at sufficiently strong
+spin-orbit coupling, which induces a square-root divergence in the electronic
+density of states at low energies. We provide results for $m^*/m$ and for the
+density of states of the interacting electrons for several values of the
+electron filling and of the spin-orbit interaction.",0703584v2
+2014-04-18,"Topological phases, topological flat bands, and topological excitations in a one-dimensional dimerized lattice with spin-orbit coupling","The Su-Schrieffer-Heeger (SSH) model describes a one-dimensional $Z_{2}$
+topological insulator, which has two topological distinct phases corresponding
+to two different dimerizations. When spin-orbit coupling is introduced into the
+SSH model, we find the structure of the Bloch bands can be greatly changed, and
+most interestingly, a new topological phase with single zero-energy bound state
+which exhibits non-Abelian statistics at each end emerges, which suggests that
+a new topological invariant is needed to fully classify all phases. In a
+comparatively large range of parameters, we find that spin-orbit coupling
+induces completely flat band with nontrivial topology. For the case with
+non-uniform dimerizaton, we find that spin-orbit coupling changes the
+symmetrical structure of topological excitations known as solitons and
+antisolitons and when spin-orbit coupling is strong enough to induce a
+topological phase transition, the whole system is topologically nontrivial but
+with the disappearance of solitons and antisolitons, consequently, the system
+is a real topological insulator with well-protected end states.",1404.4681v1
+2016-01-31,Dirac monopoles with polar-core vortex induced by spin-orbit coupling in spinor Bose-Einstein condensates,"We report Dirac monopoles with polar-core vortex induced by spin-orbit
+coupling in ferromagnetic Bose-Einstein condensates, which are attached to two
+nodal vortex lines along the vertical axis. These monopoles are more stable in
+the time scale of experiment and can be detected through directly imaging
+vortex lines. When the strength of spin-orbit coupling increases, Dirac
+monopoles with vortex can be transformed into those with square lattice. In the
+presence of spin-orbit coupling, increasing the strength of interaction can
+induce a cyclic phase transition from Dirac monopoles with polar-core vortex to
+those with Mermin-Ho vortex. The spin-orbit coupled Bose-Einstein condensates
+not only provide a new unique platform for investigating exotic monopoles and
+relevant phase transitions, but also can preserve stable monopoles after a
+quadrupole field is turned off.",1602.00189v2
+2019-05-21,Induced spin-orbit coupling in twisted graphene-TMDC heterobilayers: twistronics meets spintronics,"We propose an interband tunneling picture to explain and predict the
+interlayer twist angle dependence of the induced spin-orbit coupling in
+heterostructures of graphene and monolayer transition metal dichalcogenides
+(TMDCs). We obtain a compact analytic formula for the induced valley Zeeman and
+Rashba spin-orbit coupling in terms of the TMDC band structure parameters and
+interlayer tunneling matrix elements. We parametrize the tunneling matrix
+elements with few parameters, which in our formalism are independent of the
+twist angle between the layers. We estimate the value of the tunneling
+parameters from existing DFT calculations at zero twist angle and we use them
+to predict the induced spin-orbit coupling at non-zero angles. Provided that
+the energy of the Dirac point of graphene is close to the TMDC conduction band,
+we expect a sharp increase of the induced spin-orbit coupling around a twist
+angle of 18 degrees.",1905.08688v1
+2015-12-14,Anderson Localization in Degenerate Spin-Orbit Coupled Fermi Gases with Disorder,"Competition between superconductivity and disorder plays an essential role in
+understanding the metal-insulator transition. Based on the Bogoliubov-de Gennes
+equation, we studied an s-wave superconductor with both spin-orbit coupling and
+disorder are presented. With increasing the strength of disorder, the mean
+superconducting order parameter will vanish while the energy gap will persist,
+which indicates that the system undergoes a transition from a superconducting
+state to an insulating state. This can be confirmed by calculating the inverse
+participation ratio. We also find that, if the strength of disorder is small,
+the superconducting order parameter and the energy gap will decrease if we
+increase the strength of spin-orbit coupling and Zeeman field. In the large
+disorder limits, increasing the strength of spin-orbit coupling will increase
+the mean superconducting order parameter. This phenomenon shows that the system
+is more insensitive to disorder if the spin-orbit coupling is presented.
+Numerical computing also shows that the whole system breaks up into several
+superconducting islands instead of being superconductivity.",1512.04211v2
+2018-08-27,Transverse instability of dark solitons in spin-orbit coupled polariton condensates,"We consider dark solitons and their stability in spin-orbit coupled polariton
+condensates. The system supports spinor solitons of two types: conventional
+(symmetric) dark solitons and asymmetric half-dark solitons. They demonstrate
+essentially different behavior upon variation of the strength of spin-orbit
+coupling. One-dimensional spin-orbit coupled dark solitons are usually
+unstable, while half-dark solitons can be stable. Two-dimensional dark solitons
+at early stages of the development of transverse instabilities turn into
+asymmetric snaking patterns and later into sets of vortex-antivortex solitons
+with notably different shapes. Depending on the sign of spin-orbit coupling two
+distinct instability scenarios are possible for such solitons, in which
+vortices in one component correspond to vortices or antivortices in other
+component. The decay of two-dimensional half-dark solitons results in the
+formation of half-vortex chains.",1808.08861v2
+2020-05-28,High-harmonic generation in spin-orbit coupled systems,"We study high-harmonic generation in two-dimensional electron systems with
+Rashba and Dresselhaus spin-orbit coupling and derive harmonic generation
+selection rules with the help of group theory. Based on the bandstructures of
+these minimal models and explicit simulations we reveal how the spin-orbit
+parameters control the cutoff energy in the high-harmonic spectrum. We also
+show that the magnetic field and polarization dependence of this spectrum
+provides information on the magnitude of the Rashba and Dresselhaus spin-orbit
+coupling parameters. The shape of the Fermi surface can be deduced at least
+qualitatively and if only one type of spin-orbit coupling is present, the
+coupling strength can be determined.",2005.14293v1
+2021-03-17,Spin-orbit coupling within tightly focused circularly polarized spatiotemporal vortex wavepacket,"Spin-orbital coupling and interaction as intrinsic light fields
+characteristics have been extensively studied. Previous studies involve the
+spin angular momentum (SAM) carried by circular polarization and orbital
+angular momentum (OAM) associated with a spiral phase wavefront within the beam
+cross section, where both the SAM and OAM are in parallel with the propagation
+direction. In this work, we study a new type of spin-orbital coupling between
+the longitudinal SAM and the transverse OAM carried by a spatiotemporal optical
+vortex (STOV) wavepacket under tight focusing condition. Intricate
+spatiotemporal phase singularity structures are formed when a circularly
+polarized STOV wavepacket is tightly focused by a high numerical aperture
+objective lens. For the transversely polarized components, phase singularity
+orientation can be significantly tilted away from the transverse direction
+towards the optical axis due to the coupling between longitudinal SAM and
+transverse OAM. The connection between the amount of rotation and the temporal
+width of the wavepacket is revealed. More interestingly, spatiotemporal phase
+singularity structure with a continuous evolution from longitudinal to
+transverse orientation through the wavepacket is observed for the
+longitudinally polarized component. These exotic spin-orbit coupling phenomena
+are expected to render new effects and functions when they are exploited in
+light matter interactions.",2103.09467v1
+2023-02-22,Compressing the atomic cloud in a matter-wave stripe soliton,"We consider an attractive quasi-one dimensional spin-orbit coupled
+Bose-Einstein condensate (SOC BEC) confined in a periodic potential produced by
+the combination of linear and nonlinear optical lattices, and study the effects
+of squeezing a stripe soliton by varying the inter-atomic interaction in the
+nonlinear lattice. It is observed that the nodes on the soliton arising
+entirely due to the effect of spin-orbit coupling tend to disappear as we
+increase the squeezing effect to finally get a stable fundamental soliton. This
+leads us to conclude that external pressure can reduce the effect of spin-orbit
+coupling in the SOC BEC and even convert the system to a traditional BEC
+without spin-orbit coupling. We make use of an information theoretic measure to
+visualize how does the atomic density distribution in the condensate respond to
+continual reduction in the spin-orbit coupling effect.",2302.11626v2
+2010-08-22,High density limit of the two-dimensional electron liquid with Rashba spin-orbit coupling,"We discuss by analytic means the theory of the high-density limit of the
+unpolarized two-dimensional electron liquid in the presence of Rashba or
+Dresselhaus spin-orbit coupling. A generalization of the ring-diagram expansion
+is performed. We find that in this regime the spin-orbit coupling leads to
+small changes of the exchange and correlation energy contributions, while
+modifying also, via repopulation of the momentum states, the noninteracting
+energy. As a result, the leading corrections to the chirality and total energy
+of the system stem from the Hartree-Fock contributions. The final results are
+found to be vanishing to lowest order in the spin-orbit coupling, in agreement
+with a general property valid to every order in the electron-electron
+interaction. We also show that recent quantum Monte Carlo data in the presence
+of Rashba spin-orbit coupling are well understood by neglecting corrections to
+the exchange-correlation energy, even at low density values.",1008.3729v2
+2012-11-16,Topological phases in gated bilayer graphene: Effects of Rashba spin-orbit coupling and exchange field,"We present a systematic study on the influence of Rashba spin-orbit coupling,
+interlayer potential difference and exchange field on the topological
+properties of bilayer graphene. In the presence of only Rashba spin-orbit
+coupling and interlayer potential difference, the band gap opening due to
+broken out-of-plane inversion symmetry offers new possibilities of realizing
+tunable topological phase transitions by varying an external gate voltage. We
+find a two-dimensional $Z_2$ topological insulator phase and a quantum valley
+Hall phase in $AB$-stacked bilayer graphene and obtain their effective
+low-energy Hamiltonians near the Dirac points. For $AA$ stacking, we do not
+find any topological insulator phase in the presence of large Rashba spin-orbit
+coupling. When the exchange field is also turned on, the bilayer system
+exhibits a rich variety of topological phases including a quantum anomalous
+Hall phase, and we obtain the phase diagram as a function of the Rashba
+spin-orbit coupling, interlayer potential difference, and exchange field.",1211.3802v1
+2014-11-18,A Band of Critical States in Anderson Localization at Strong Magnetic Field with Random Spin-Orbit Scattering,"Anderson localization problem for non-interacting two-dimensional electron
+gas subject to strong magnetic field, disordered potential and spin-orbit
+coupling is studied numerically on a square lattice. The nature of the
+corresponding localization-delocalization transition and the properties of the
+pertinent extended states depend on the nature of the spin-orbit coupling
+(uniform or fully random). For uniform spin-orbit coupling (such as Rashba
+coupling), there is a band of extended states in the center of a Landau band as
+in a ""standard"" Anderson metal-insulator transition. However, for fully random
+spin-orbit coupling, the familiar pattern of Landau bands disappears. Instead,
+there is a central band of critical states with definite fractal structure
+separated at two critical energies from two side bands of localized states.
+Moreover, finite size scaling analysis suggests that for this novel transition,
+on the localized side of a critical energy $E_c$, the localization length
+diverges as $\xi(E) \propto\exp(\alpha/\sqrt{|E-E_c|})$, a behavior which,
+along with the band of critical states, is reminiscent of a
+Berezinskii-Kosterlitz-Thouless transition.",1411.4838v1
+2015-09-11,An exactly solvable model for a strongly spin-orbit-coupled nanowire quantum dot,"In the presence of spin-orbit coupling, quantum models for semiconductor
+materials are generally not exactly solvable. As a result, understanding of the
+strong spin-orbit coupling effects in these systems remains poor. Here we
+develop an analytical method to solve the one-dimensional hard-wall quantum dot
+problem in the presence of strong spin-orbit coupling and magnetic field, which
+allows us to obtain exact eigenenergies and eigenstates of a single electron.
+With the help of the exact solution, we demonstrate some unique effects from
+the strong spin-orbit coupling in a semiconductor quantum dot, in particular
+the anisotropy of the electron g-factor and its tunability.",1509.03402v1
+2021-05-06,Spin-orbit coupling driven superfluid states in optical lattices at zero and finite temperatures,"We investigate the quantum phase transitions of a two-dimensional
+Bose-Hubbard model in the presence of a Rashba spin-orbit coupling with and
+without thermal fluctuations. The interplay of single-particle hopping,
+strength of spin-orbit coupling, and interspin interaction leads to superfluid
+phases with distinct properties. With interspin interactions weaker than
+intraspin interactions, the spin-orbit coupling induces two finite-momentum
+superfluid phases. One of them is a phase-twisted superfluid that exists at low
+hopping strengths and reduces the domain of insulating phases. At comparatively
+higher hopping strengths, there is a transition from the phase-twisted to a
+finite momenta stripe superfluid. With interspin interactions stronger than the
+intraspin interactions, the system exhibits phase-twisted to ferromagnetic
+phase transition. At finite temperatures, the thermal fluctuations destroy the
+phase-twisted superfluidity and lead to a wide region of normal-fluid states.
+These findings can be observed in recent quantum gas experiments with
+spin-orbit coupling in optical lattices.",2105.02747v2
+2022-05-24,Universal scattering phase shift in the presence of spin-orbit coupling,"Scattering phase shift, as a key parameter in scattering theory, plays an
+important role in characterizing low-energy collisions between ultracold atoms.
+In this work, we theoretically investigate the universal low-energy behavior of
+the scattering phase shifts for cold atoms in the presence of spin-orbit
+coupling. We first construct the asymptotic form of the two-body wave function
+when two fermions get as close as the interaction range, and consider
+perturbatively the correction of the spin-orbit coupling up to the second
+order, in which new scattering parameters are introduced. Then for elastic
+collisions, the scattering phase shifts are defined according to the unitary
+scattering $S$ matrix. We show how the low-energy behavior of the scattering
+phase shifts is modified by these new scattering parameters introduced by
+spin-orbit coupling. The universality of the scattering phase shifts is
+manifested as the independence of the specific form of the interatomic
+potential. The explicit forms of the new scattering parameters are analytically
+derived within a model of the spherical-square-well potential. Our method
+provides a unified description of the low-energy properties of scattering phase
+shifts in the presence of spin-orbit coupling.",2205.11732v1
+2007-09-13,Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems,"Based on spin-charge coupled drift-diffusion equations, which are derived
+from kinetic equations for the spin-density matrix in a rigorous manner, the
+electric-field-induced nonequilibrium spin polarization is treated for a
+two-dimensional electron gas with both Rashba and Dresselhaus spin-orbit
+coupling. Most emphasis is put on the consideration of the field-mediated spin
+dynamics for a model with equal Rashba and Dresselhaus coupling constants, in
+which the spin relaxation is strongly suppressed. Weakly damped
+electric-field-induced spin excitations are identified, which remind of
+space-charge waves in crystals.",0709.2054v1
+2020-11-19,Coupling spins to nanomechanical resonators: Toward quantum spin-mechanics,"Spin-mechanics studies interactions between spin systems and mechanical
+vibrations in a nanomechanical resonator and explores their potential
+applications in quantum information processing. In this tutorial, we summarize
+various types of spin-mechanical resonators and discuss both the
+cavity-QED-like and the trapped-ion-like spin-mechanical coupling processes.
+The implementation of these processes using negatively charged nitrogen vacancy
+and silicon vacancy centers in diamond is reviewed. Prospects for reaching the
+full quantum regime of spin-mechanics, in which quantum control can occur at
+the level of both single spin and single phonon, are discussed with an emphasis
+on the crucial role of strain coupling to the orbital degrees of freedom of the
+defect centers.",2011.09990v1
+2018-08-29,Spin-orbit effects surfacing on manganites,"Spin-orbit coupling in magnetic systems lacking inversion symmetry can give
+rise to non trivial spin textures. Magnetic thin films and heterostructures are
+potential candidates for the formation of skyrmions and other non-collinear
+spin configurations as inversion symmetry is inherently lost at their surfaces
+and interfaces. However, manganites, in spite of their extraordinarily rich
+magnetic phase diagram, have not yet been considered of interest within this
+context as their spin-orbit coupling is assumed to be negligible. We
+demonstrate here, by means of angular dependent X-ray linear dichroism
+experiments and theoretical calculations, the existence of a noncollinear
+antiferromagnetic ordering at the surface of ferromagnetic
+La$_{2/3}$Sr$_{1/3}$MnO$_3$ thin films whose properties can only be explained
+by an unexpectedly large enhancement of the spin-orbit interaction. Our results
+reveal that spin-orbit coupling, usually assumed to be very small on
+manganites, can be significantly enhanced at surfaces and interfaces adding a
+new twist to the possible magnetic orders that can arise in electronically
+reconstructed systems.",1808.09990v1
+2014-05-18,Magnetotransport properties of two-dimensional fermions with $k$-cubic Rashba spin-orbit interaction,"The spin-orbit interaction in heavy hole gas formed at $p$-doped
+semiconductor heterojunctions and electron gas at {\mbox SrTiO}${}_3$ surfaces
+is cubic in momentum. Here we report magnetotransport properties of k-cubic
+Rashba spin-orbit coupled two-dimensional fermionic systems. We study
+longitudinal (Shubnikov-de Haas (SdH) oscillations) and Hall component of the
+resistivity tensor analytically as well as numerically. The longitudinal
+resistivity shows beating pattern due to different SdH oscillation frequencies
+$ f_{\pm} $ for spin-up and spin-down fermions. We propose empirical forms of $
+f_{\pm} $ as exact expressions are not available, which are being used to find
+location of the beating nodes. The beating nodes and the number of oscillations
+between any two successive nodes obtained from exact numerical results are in
+excellent agreement with those calculated from the proposed empirical form. In
+the Hall resistivity, an additional Hall plateau appears in between two
+conventional ones as spin-orbit coupling constant increases. The width of this
+additional plateau increases with spin-orbit coupling constant.",1405.4533v2
+2020-04-21,Surface Rashba-Edelstein Spin-Orbit Torque Revealed by Molecular Self-Assembly,"We report the observation of a spin-orbit torque (SOT) originating from the
+surface Rashba-Edelstein effect. We found that the SOT in a prototypical
+spin-orbitronic system, a Pt/Co bilayer, can be manipulated by molecular
+self-assembly on the Pt surface. This evidences that the Rashba spin-orbit
+coupling at the Pt surface generates a sizable SOT, which has been hidden by
+the strong bulk and interface spin-orbit coupling. We show that the molecular
+tuning of the surface Rashba-Edelstein SOT is consistent with density
+functional theory calculations. These results illustrate the crucial role of
+the surface spin-orbit coupling in the SOT generation, which alters the
+landscape of metallic spin-orbitronic devices.",2004.09852v1
+2022-02-24,Proximity spin-orbit and exchange coupling in ABA and ABC trilayer graphene van der Waals heterostructures,"We investigate the proximity spin-orbit and exchange couplings in ABA and ABC
+trilayer graphene encapsulated within monolayers of semiconducting
+transition-metal dichalcogenides and the ferromagnetic semiconductor
+Cr$_2$Ge$_2$Te$_6$. Employing first-principles calculations we obtain the
+electronic structures of the multilayer stacks and extract the relevant
+proximity-induced orbital and spin interaction parameters by fitting the
+low-energy bands to model Hamiltonians. We also demonstrate the tunability of
+the proximity effects by a transverse electric field. Using the model
+Hamiltonians we also study mixed spin-orbit/exchange coupling encapsulation,
+which allows to tailor the spin interactions very efficiently by the applied
+field. We also summarize the spin-orbit physics of bare ABA, ABC, and ABB
+trilayers, and provide, along with the first-principles results of the
+electronic band structures, density of states, spin splittings, and
+electric-field tunabilities of the bands, qualitative understanding of the
+observed behavior and realistic model parameters as a resource for model
+simulations of transport and correlation physics in trilayer graphene.",2202.11922v1
+2022-11-08,Spin effects in Spherical Harmonic Modes of Gravitational Waves from Eccentric Compact Binary Inspirals,"We compute the leading and sub-leading spin effects through the second
+post-Newtonian order (2PN) in spherical harmonic modes of gravitational
+waveforms from inspiralling compact binaries in non-circular orbits with
+non-precessing components. The two spin couplings, linear-in-spin (spin-orbit;
+SO) and quadratic-in-spin (spin-spin; SS), that appear in 2PN waveforms are
+computed with desired accuracy and explicit expressions for relevant modes are
+derived. The modes that have spin corrections through 2PN include $(\ell,
+|m|)$=$((2,2),\,(2,1),\,(3,3),\,(3,2),\,(3,1),\,(4,3),\,(4,1))$ modes. Closed
+form expressions for these modes for compact binaries in general orbits as well
+as in elliptical orbits are being provided. While the general orbit results can
+be used to study signals from binaries in orbits of arbitrary shape and nature,
+elliptical orbit results are applicable to systems with arbitrary
+eccentricities. We also express the elliptical orbit results as leading
+eccentric corrections to the circular results. Our prescription represents, the
+first, fully analytical treatment that combines spins, eccentricity and higher
+modes together and completes computation of spin effects through 2PN order.
+These should find immediate applications in inspiral-merger-ringdown modelling
+for eccentric mergers including the effect of non-precessing spins and higher
+modes as well as in parameter estimation analyses employing inspiral waveform.",2211.04155v2
+2013-11-24,The Raman dressed spin-1 spin-orbit coupled quantum gas,"The recently realized spin-orbit coupled quantum gases (Y.-J Lin {\it et
+al}., Nature 471, 83-86 (2011); P. Wang {\it et al}., PRL 109, 095301 (2012);
+L. W. Cheuk {\it et al}., PRL 109, 095302 (2012)) mark a breakthrough in the
+cold atom community. In these experiments, two hyperfine states are selected
+from a hyperfine manifold to mimic a pseudospin-1/2 spin-orbit coupled system
+by the method of Raman dressing, which is applicable to both bosonic and
+fermionic gases. In this work, we show that the method used in these
+experiments can be generalized to create any large pseudospin spin-orbit
+coupled gas if more hyperfine states are coupled equally by the Raman lasers.
+As an example, we study in detail a quantum gas with three hyperfine states
+coupled by the Raman lasers, and show when the state-dependent energy shifts of
+the three states are comparable, triple-degenerate minima will appear at the
+bottom of the band dispersions, thus realizing a spin-1 spin-orbit coupled
+quantum gas. A novel feature of this three minima regime is that there can be
+two different kinds of stripe phases with different wavelengths, which has an
+interesting connection to the ferromagnetic and polar phases of spin-1 spinor
+BECs without spin-orbit coupling.",1311.6177v2
+2019-12-18,Spin-Orbital Textures and Interferometers by Nanoscale Geometric Design of Quantum Rings with Orbital Rashba Coupling,"We derive an effective continuum model for describing the propagation of
+electrons in ballistic one-dimensional curved nanostructure which are marked by
+a strong interplay of spin-orbital degrees of freedom due to local electronic
+states with $d-$orbital symmetry, atomic spin-orbit and orbital Rashba
+couplings. We demonstrate how a planar inhomogeneous spatial curvature of the
+nanochannel can generate both spin and orbital textures represented through
+loops on the corresponding Bloch spheres. In particular, we employ the
+paradigmatic case of an elliptically shaped quantum ring to investigate the
+role of geometry in steering the electron transport at low energy. We find that
+in this regime spin and orbital textures exhibit equal windings around the
+radial or out-of-plane directions. Remarkably, the spin and orbital windings
+can be not only tuned through a modification of the nanoscale shape, as for the
+spin Rashba effect, but also via a change in the electron density by electrical
+gating. We show that the presence of textures is related to patterns in the
+geometric Aharonov-Anandan phase acquired in a cycle within the quantum ring.
+Furthermore, differently from the single band Rashba-coupled nanoring, a
+manipulation of the conductance can be achieved by electron density variation
+and, indirectly, through changes of the strength of the inversion asymmetric
+interactions.",1912.08621v1
+2022-12-07,Surfing in the phase space of spin-orbit coupling in binary asteroid systems,"For a satellite with an irregular shape, which is the common shape among
+asteroids, the well-known spin-orbit resonance problem could be changed to a
+spin-orbit coupling problem since a decoupled model does not accurately capture
+the dynamics of the system. In this paper, having provided a definition for
+close binary asteroid systems, we explore the structure of the phase space in a
+classical Hamiltonian model for spin-orbit coupling in a binary system. To map
+out the geography of resonances analytically and the cartography of resonances
+numerically, we reformulate a fourth-order gravitational potential function, in
+Poincare variables, via Stokes coefficients. For a binary system with a
+near-circular orbit, isolating the Hamiltonian near each resonance yields the
+pendulum model. Analysis of the results shows the geographical information,
+including the location and width of resonances, is modified due to the
+prominent role of the semi-major axis in the spin-orbit coupling model but not
+structurally altered. However, this resulted in modified Chirikov criterion to
+predict onset of large-scale chaos. For a binary system with arbitrary closed
+orbit, we thoroughly surf in the phase space via cartography of resonances
+created by fast Lyapunov indicator (FLI) maps. The numerical study confirms the
+analytical results, provides insight into the spin-orbit coupling, and shows
+some bifurcations in the secondary resonances which can occur due to material
+transfer. Also, we take the (65803) Didymos binary asteroid as a case to show
+analytical and numerical results.",2212.03837v1
+2016-08-03,Minimal Ingredients for Orbital Texture Switches at Dirac Points in Strong Spin-Orbit Coupled Materials,"Recent angle resolved photoemission spectroscopy measurements on strong
+spin-orbit coupled materials have shown an in-plane orbital texture switch at
+their respective Dirac points, regardless of whether they are topological
+insulators or ""trivial"" Rashba materials. This feature has also been
+demonstrated in a few materials ($\text{Bi}_2\text{Se}_3$,
+$\text{Bi}_2\text{Te}_3$, and $\text{BiTeI}$) though DFT calculations. Here we
+present a minimal orbital-derived tight binding model to calculate the electron
+wave-function in a two-dimensional crystal lattice. We show that the orbital
+components of the wave-function demonstrate an orbital-texture switch in
+addition to the usual spin switch seen in spin polarized bands. This orbital
+texture switch is determined by the existence of three main properties: local
+or global inversion symmetry breaking, strong spin-orbit coupling, and
+non-local physics (the electrons are on a lattice). Using our model we
+demonstrate that the orbital texture switch is ubiquitous and to be expected in
+many real systems. The orbital hybridization of the bands is the key aspect for
+understanding the unique wave function properties of these materials, and this
+minimal model helps to establish the quantum perturbations that drive these
+hybridizations.",1608.01387v1
+2022-04-21,Tailoring neuromorphic switching by CuNx-mediated orbital currents,"Current-induced spin-orbit torque (SOT) is regarded as a promising mechanism
+for driving neuromorphic behavior in spin-orbitronic devices. In principle, the
+strong SOT in heavy metal-based magnetic heterostructure is attributed to the
+spin-orbit coupling (SOC)-induced spin Hall effect (SHE) and/or the spin
+Rashba-Edelstein effect (SREE). Recently, SOC-free mechanisms such as the
+orbital angular momentum (OAM)-induced orbital Hall effect (OHE) and/or the
+orbital Rashba-Edelstein effect (OREE) have been proposed to generate sizable
+torques comparable to those from the conventional spin Hall mechanism. In this
+work, we show that the orbital current can be effectively generated by the
+nitrided light metal Cu. The overall damping-like SOT efficiency, which
+consists of both the spin and the orbital current contributions, can be
+tailored from ~ 0.06 to 0.4 in a Pt/Co/CuNx magnetic heterostructure by tuning
+the nitrogen doping concentration. Current-induced magnetization switching
+further verifies the efficacy of such orbital current with a critical switching
+current density as low as Jc ~ 5 x 10^10 A/m2. Most importantly, the
+orbital-current-mediated memristive switching behavior can be observed in such
+heterostructures, which reveals that the gigantic SOT and efficient
+magnetization switching are the tradeoffs for the applicable window of
+memristive switching. Our work provides insights into the role of orbital
+current might play in SOT neuromorphic devices and paves a new route for making
+energy-efficient spin-orbitronic devices.",2204.09846v3
+2007-07-24,Spin Hall Effect and Spin Orbit coupling in Ballistic Nanojunctions,"We propose a new scheme of spin filtering based on nanometric crossjunctions
+in the presence of Spin Orbit interaction, employing ballistic nanojunctions
+patterned in a two-dimensional electron gas. We demonstrate that the flow of a
+longitudinal unpolarized current through a ballistic X junction patterned in a
+two-dimensional electron gas with Spin Orbit coupling (SOC) induces a spin
+accumulation which has opposite signs for the two lateral probes. This spin
+accumulation, corresponding to a transverse pure spin current flowing in the
+junction, is the main observable signature of the spin Hall effect in such
+nanostructures.
+  We benchmark the effects of two different kinds of Spin Orbit interactions.
+The first one ($\alpha$-SOC) is due to the interface electric field that
+confines electrons to a two-dimensional layer, whereas the second one
+($\beta$-SOC) corresponds to the interaction generated by a lateral confining
+potential.",0707.3580v1
+2007-11-07,Hamiltonian of two spinning compact bodies with next-to-leading order gravitational spin-orbit coupling,"A Hamiltonian formulation is given for the gravitational dynamics of two
+spinning compact bodies to next-to-leading order ($G/c^4$ and $G^2/c^4$) in the
+spin-orbit interaction. We use a novel approach (valid to linear order in the
+spins), which starts from the second-post-Newtonian metric (in ADM coordinates)
+generated by two spinless bodies, and computes the next-to-leading order
+precession, in this metric, of suitably redefined ``constant-magnitude''
+3-dimensional spin vectors ${\bf S}_1$, ${\bf S}_2$. We prove the Poincar\'e
+invariance of our Hamiltonian by explicitly constructing ten phase-space
+generators realizing the Poincar\'e algebra. A remarkable feature of our
+approach is that it allows one to derive the {\it orbital} equations of motion
+of spinning binaries to next-to-leading order in spin-orbit coupling without
+having to solve Einstein's field equations with a spin-dependent stress tensor.
+We show that our Hamiltonian (orbital and spin) dynamics is equivalent to the
+dynamics recently obtained by Faye, Blanchet, and Buonanno, by solving
+Einstein's equations in harmonic coordinates.",0711.1048v2
+2015-07-22,Observation of correlated spin-orbit order in a strongly anisotropic quantum wire system,"Quantum wires with spin-orbit coupling provide a unique opportunity to
+simultaneously control the coupling strength and the screened Coulomb
+interactions where new exotic phases of matter can be explored. Here we report
+on the observation of an exotic spin-orbit density wave in Pb-atomic wires on
+Si(557) surfaces by mapping out the evolution of the modulated spin-texture at
+various conditions with spin- and angle-resolved photoelectron spectroscopy.
+The results are independently quantified by surface transport measurements. The
+spin polarization, coherence length, spin dephasing rate, and the associated
+quasiparticle gap decrease simultaneously as the screened Coulomb interaction
+decreases with increasing excess coverage, providing a new mechanism for
+generating and manipulating a spin-orbit entanglement effect via electronic
+interaction. Despite clear evidence of spontaneous spin-rotation symmetry
+breaking and modulation of spin-momentum structure as a function of excess
+coverage, the average spin-polarization over the Brillouin zone vanishes,
+indicating that time-reversal symmetry is intact as theoretically predicted.",1507.06152v1
+2007-01-30,Anisotropic spin transport in GaAs quantum wells in the presence of competing Dresselhaus and Rashba spin-orbit-coupling strengths,"Aiming at the optimization of the spin diffusion length in (001) GaAs quantum
+wells, we explore the effect of the anisotropy of the spin-orbit coupling on
+the competition between the Rashba and the Dresselhaus spin-orbit couplings by
+solving the kinetic spin Bloch equations with the electron-phonon and the
+electron-electron scattering explicitly included. For identical strengths of
+the Rashba and the Dresselhaus spin-orbit couplings, the spin diffusion length
+shows strong anisotropy not only for the spin polarization direction but also
+for the spin diffusion direction. Two special directions are used seeking for
+the large diffusion length: ($\bar{1}$10) and (110). Without the cubic term of
+the Dresselhaus spin-orbit coupling and with the identical Dresselhaus and
+Rashba strengths, infinite diffusion lengths can be obtained {\em either} for
+the spin diffusion/injection direction along $(\bar110)$, regardless of the
+direction of spin polarization, {\em or} for the spin polarization along
+$(110)$, regardless of the direction of the spin diffusion/injection.
+  However, the cubic Dresselhaus term cannot be neglected, resulting into a
+finite spin diffusion length which decreases with the temperature and the
+electron density, and of which the anisotropy for the spin diffusion direction
+and spin polarization direction is maintained. For the spin diffusion/injection
+direction along ($\bar{1}$10), the spin diffusion length increases first with
+the increase of the Rashba strength (from 0) which can be tuned by the external
+gate voltage; when the Rashba strength is slightly smaller than (in stead of
+equal to) the Dresselhaus strength, the diffusion length reaches its maximum;
+and then it decreases with the Rashba strength.",0701762v2
+2005-07-21,Spin relaxation under identical Dresselhaus and Rashba coupling strengths in GaAs quantum wells,"Spin relaxation under identical Dresselhaus and Rashba coupling strengths in
+GaAs quantum wells is studied in both the traditional collinear statistics,
+where the energy spectra do not contain the spin-orbit coupling terms, and the
+helix statistics, where the spin-orbit couplings are included in the energy
+spectra. We show that there is only marginal difference between the spin
+relaxation times obtained from these two different statistics. We further show
+that with the cubic term of the Dresselhaus spin-orbit coupling included, the
+spin relaxation time along the (1,1,0) direction becomes finite, although it is
+still much longer than that along the other two perpendicular directions. The
+properties of the spin relaxation along this special direction under varies
+conditions are studied in detail.",0507497v3
+2011-10-17,Acoustic phonons mediated non-equilibrium spin current in the presence of Rashba and Dresselhaus spin-orbit couplings,"The influence of the electrons interaction with longitudinal acoustic phonons
+on magnetoeletric and spin-related transport effects are investigated. The
+physical system under consideration has been assumed to be a two dimensional
+electron gas system with both Rashba and Dreesselhaus spin-orbit couplings. In
+the works which have been previously performed in this field it has been shown
+that in the non-equilibrium regime, the Rashba and Dreesselhaus couplings can
+not be responsible for spin-current where in the absence of other interactions
+such as lattice vibrations identically vanishes. In the current work we have
+employed a semi-classical method by using the Boltzmann approach. It was shown
+that the spin-current of the system, in general, does not go all the way to
+zero at any value of the spin-orbit couplings. It was also shown that the spin
+accumulation of the system can be influenced by the electron-phonon coupling.",1110.3667v3
+2022-06-29,"Continuously tracked, stable, large excursion trajectories of dipolar coupled nuclear spins","We report an experimental approach to excite, stabilize, and continuously
+track Bloch sphere orbits of dipolar-coupled nuclear spins in a solid. We
+demonstrate these results on a model system of hyperpolarized 13C nuclear spins
+in diamond. Without quantum control, inter-spin coupling leads to rapid spin
+decay in T2*=1.5ms. We elucidate a method to preserve trajectories for over
+T2'>27s at excursion solid angles up to 16 degrees, even in the presence of
+strong inter-spin coupling. This exploits a novel spin driving strategy that
+thermalizes the spins to a long-lived dipolar many-body state, while driving
+them in highly stable orbits. We show that motion of the spins can be
+quasi-continuously tracked for over 35s in three dimensions on the Bloch
+sphere. In this time the spins complete >68,000 closed precession orbits,
+demonstrating high stability and robustness against error. We experimentally
+probe the transient approach to such rigid motion, and thereby show the ability
+to engineer highly stable ""designer"" spin trajectories. Our results suggest new
+ways to stabilize and interrogate strongly-coupled quantum systems through
+periodic driving and portend powerful applications of rigid spin orbits in
+quantum sensing.",2206.14945v2
+2016-12-23,Spin-orbital order in undoped manganite LaMnO3 at finite temperature,"We investigate the evolution of spin and orbital order in undoped LaMnO$_3$
+under increasing temperature with a model including both superexchange and
+Jahn-Teller interactions. We used several cluster mean field calculation
+schemes and find coexisting $A$-type antiferromagnetic ($A$-AF) and $C$-type
+alternating orbital order at low temperature. The value of the Jahn-Teller
+coupling between strongly correlated $e_g$ orbitals is estimated from the
+orbital transition temperature at $T_{\rm OO}\simeq 780$ K. By a careful
+analysis of on-site and on-bond correlations we demonstrate that spin-orbital
+entanglement is rather weak. We have verified that the magnetic transition
+temperature is influenced by entangled spin-orbital operators as well as by
+entangled orbital operators on the bonds but the errors introduced by
+decoupling such operators partly compensate each other. Altogether, these
+results justify why the commonly used disentangled spin-orbital model is so
+successful in describing the magnetic properties and the temperature dependence
+of the optical spectral weights for LaMnO$_3$.",1612.08016v1
+2020-01-10,Orbital Hall Insulating Phase in Transition Metal Dichalcogenide Monolayers,"We show that H-phase transition metal dichalcogenides (TMDs) monolayers such
+as MoS$_2$ and WSe$_2$, are orbital Hall insulators. They present very large
+orbital Hall conductivity plateaus in their semiconducting gap, where the spin
+Hall conductivity vanishes. Our results open the possibility of using TMDs for
+orbital current injection and orbital torque transfers that surpass their
+spin-counterparts in spin-orbitronics devices. The orbital Hall effect (OHE) in
+TMD monolayers occurs even in the absence of spin-orbit coupling. It can be
+linked to exotic momentum-space Dresselhaus-like orbital textures, analogous to
+the spin-momentum locking in 2D Dirac fermions that arise from a combination of
+orbital attributes and lattice symmetry.",2001.03592v2
+2019-03-04,Orbital Torque: Torque Generation by Orbital Current Injection,"We propose a mechanism of torque generation by injection of an orbital
+current, which we call $\textit{orbital torque}$. In a magnetic bilayer
+consisting of a nonmagnet (NM) and a ferromagnet (FM), we consider a situation
+where the spin-orbit coupling (SOC) is present only in the FM. Although the SOC
+is absent in the NM, the orbital Hall effect can arise in the NM. When the
+resulting orbital Hall current is injected to the FM, the SOC of the FM
+converts the orbital angular momentum into spin, which exerts torque to the
+magnetization of the FM. Remarkably, even for small SOC strength comparable to
+that of $3d$ FMs, the orbital torque can be comparable to the spin torque
+induced by the spin Hall effect of the NM with strong SOC. This provides a way
+to experimentally probe the OHE and opens a new venue to achieving spin-torque
+devices based on light elements that exhibit gigantic orbital response.
+Experimental implications are discussed.",1903.01085v3
+2010-01-20,Spin electric effects in molecular antiferromagnets,"Molecular nanomagnets show clear signatures of coherent behavior and have a
+wide variety of effective low-energy spin Hamiltonians suitable for encoding
+qubits and implementing spin-based quantum information processing. At the
+nanoscale, the preferred mechanism for control of quantum systems is through
+application of electric fields, which are strong, can be locally applied, and
+rapidly switched. In this work, we provide the theoretical tools for the search
+for single molecule magnets suitable for electric control. By group-theoretical
+symmetry analysis we find that the spin-electric coupling in triangular
+molecules is governed by the modification of the exchange interaction, and is
+possible even in the absence of spin-orbit coupling. In pentagonal molecules
+the spin-electric coupling can exist only in the presence of spin-orbit
+interaction. This kind of coupling is allowed for both $s=1/2$ and $s=3/2$
+spins at the magnetic centers. Within the Hubbard model, we find a relation
+between the spin-electric coupling and the properties of the chemical bonds in
+a molecule, suggesting that the best candidates for strong spin-electric
+coupling are molecules with nearly degenerate bond orbitals. We also
+investigate the possible experimental signatures of spin-electric coupling in
+nuclear magnetic resonance and electron spin resonance spectroscopy, as well as
+in the thermodynamic measurements of magnetization, electric polarization, and
+specific heat of the molecules.",1001.3584v1
+2009-04-08,Spin--orbital physics in transition metal oxides,"We present the main features of the spin-orbital superexchange which
+describes the magnetic and optical properties of Mott insulators with orbital
+degrees of freedom. In contrast to the SU(2) symmetry of spin superexchange,
+the orbital part of the superexchange obeys the lower cubic symmetry of the
+lattice and is intrinsically frustrated. This intrinsic frustration and
+spin-orbital entanglement induce enhanced quantum fluctuations, and we point
+out a few situations where this leads to disordered states. Strong coupling
+between the spin and orbital degrees of freedom is discussed on the example of
+the $R$VO$_3$ perovskites, with $R$ standing for rare-earth ion, La,...,Lu. We
+explain the observed evolution of the orbital $T_{\rm OO}$ and N\'eel $T_{N1}$
+transition temperature in the $R$VO$_3$ series with decreasing ionic radius
+$r_R$. A few open problems and the current directions of research in the field
+of spin-orbital physics are pointed out.",0904.1297v1
+2023-08-13,Tunable persistent currents in a spin-orbit coupled pseudospin-1 fermionic quantum ring,"We conduct a thorough study of the persistent currents in a spin-orbit
+coupled ${\alpha}-T_3$ pseudospin-1 fermionic quantum ring (QR) that smoothly
+interpolates between graphene (${\alpha} = 0$, pseudospin-1/2) and a dice
+lattice (${\alpha} = 1$, pseudospin-1). In particular, we have considered both
+intrinsic spin-orbit coupling (ISOC) and Rashba spin-orbit coupling (RSOC) in
+addition to an external magnetic field, and have systematically enumerated
+their individual and combined effects on the charge, valley and the
+spin-polarized persistent currents. The energy levels of the system comprise of
+the conduction bands, valence bands, and flat bands which show non-monotonic
+dependencies on the ring radius, R of the QR, in the sense that, for small R,
+the energy levels vary as 1/R, while the variation is linear in R for large R.
+The cases corresponding to zero magnetic fields are benchmarked with those for
+finite external fields. Further, it is noted that the flat bands demonstrate
+dispersive behavior, and hence can contribute to the transport properties only
+when ISOC is non-zero. Moreover, the RSOC yields spin-split bands, thereby
+contributing to the spin-resolved currents, together with distinct degeneracies
+for different spin branches. The persistent currents in the charge, valley, and
+spin sectors for each of these cases oscillate as a function of the magnetic
+field with a period equal to the flux quantum, as they should be, and depend
+upon the spin-orbit coupling terms. Further, we have explored the role played
+by the parameter ${\alpha}$ in our entire analysis to ascertain the effect of
+the flat bands.",2308.06804v1
+2024-02-14,Giant asymmetric proximity-induced spin-orbit coupling in twisted graphene/SnTe heterostructure,"We analyze the spin-orbit coupling effects in a three-degree twisted bilayer
+heterostructure made of graphene and an in-plane ferroelectric SnTe, with the
+goal of transferring the spin-orbit coupling from SnTe to graphene, via the
+proximity effect. Our results indicate that the point-symmetry breaking due to
+the incompatible mutual symmetry of the twisted monolayers and a strong
+hybridization has a massive impact on the spin splitting in graphene close to
+the Dirac point, with the spin splitting values greater than 20 meV. The band
+structure and spin expectation values of graphene close to the Dirac point can
+be described using a symmetry-free model, triggering different types of
+interaction with respect to the threefold symmetric graphene/transition-metal
+dichalcogenide heterostructure. We show that the strong hybridization of the
+Dirac cone's right movers with the SnTe band gives rise to a large asymmetric
+spin splitting in the momentum space. Furthermore, we discover that the
+ferroelectricity-induced Rashba spin-orbit coupling in graphene is the dominant
+contribution to the overall Rashba field, with the effective in-plane electric
+field that is almost aligned with the (in-plane) ferroelectricity direction of
+the SnTe monolayer. We also predict an anisotropy of the in-plane spin
+relaxation rates. Our results demonstrate that the group-IV monochalcogenides
+MX (M=Sn, Ge; X=S, Se, Te) are a viable alternative to transition-metal
+dichalcogenides for inducing strong spin-orbit coupling in graphene.",2402.09045v1
+2013-08-16,Theory of metallic double perovskites with spin orbit coupling and strong correlations; application to ferrimagnetic Ba2FeReO6,"We consider a model of the double perovskite Ba2FeReO6, a room temperature
+ferrimagnet with correlated and spin-orbit coupled Re t2g electrons moving in
+the background of Fe moments stabilized by Hund's coupling. We show that for
+such 3d/5d double perovskites, strong correlations on the 5d-element (Re) are
+essential in driving a half-metallic ground state. Incorporating both strong
+spin-orbit coupling and the Hubbard repulsion on Re leads to a band structure
+consistent with ab initio calculations. Using our model, we find a large spin
+polarization at the Fermi level, and obtain a semi-quantitative understanding
+of the saturation magnetization of Ba2FeReO6, as well as X-ray magnetic
+circular dichroism data indicating a significant orbital magnetization. Based
+on the orbital populations obtained in our theory, we predict a specific doping
+dependence to the tetragonal distortion accompanying ferrimagnetic order.
+Finally, the combination of a net magnetization and spin-orbit interactions is
+shown to induce Weyl nodes in the band structure, and we predict a significant
+intrinsic anomalous Hall effect in hole-doped Ba2FeReO6. The uncovered
+interplay of strong correlations and spin-orbit coupling lends partial support
+to our previous work, which used a local moment description to capture the spin
+wave dispersion found in neutron scattering measurements. Our work is of broad
+interest for understanding metallic 4d-based and 5d-based double perovskites
+which are of fundamental interest and of possible relevance to spintronic
+applications.",1308.3701v2
+2024-02-08,Quantum Anomalous Hall Effect in $d$-Electron Kagome Systems: Chern Insulating States from Transverse Spin-Orbit Coupling,"Inspired by the discovery of metal-organic frameworks, the possibility of
+quantum anomalous Hall effect (QAHE) in two-dimensional kagome systems with
+$d$-orbital electrons is studied within a multi-orbital tight-binding model. In
+the absence of exchange-type spin-orbit coupling, isotropic Slater-Koster
+integrals give a band structure with relativistic (Dirac) and quadratic band
+crossing points at high symmetry spots in the Brillouin zone. A quantized
+topological invariant requires a flux-creating spin-orbit coupling, giving
+Chern number (per spin sector) $C=1$ not only from the familiar Dirac points at
+the six corners of the Brillouin zone, but also from the quadratic band
+crossing point at the center $\Gamma$. Surprisingly, this QAHE comes from the
+nontrivial effective flux induced by the transverse part of the spin-orbit
+coupling, exhibited by electrons in the $d$-orbital state with $m_l=0$
+($d_{z^2}$ orbital), in stark contrast to the more familiar form of QAHE due to
+the $d$-orbitals with $m_l \neq 0$, driven by the Ising part of spin-orbit
+coupling. The $C=1$ Chern plateau (per spin sector) due to Dirac point extends
+over a smaller region of Fermi energy than that due to quadratic band crossing.
+Our result hints at the promising potential of kagome metal-organic frameworks
+as a platform for dissipationless electronics by virtue of its unique QAHE.",2402.05845v1
+2011-04-24,Competition of crystal field splitting and Hund's rule coupling in two-orbital magnetic metal-insulator transitions,"Competition of crystal field splitting and Hund's rule coupling in magnetic
+metal-insulator transitions of half-filled two-orbital Hubbard model is
+investigated by multi-orbital slave-boson mean field theory. We show that with
+the increase of Coulomb correlation, the system firstly transits from a
+paramagnetic (PM) metal to a {\it N\'{e}el} antiferromagnetic (AFM) Mott
+insulator, or a nonmagnetic orbital insulator, depending on the competition of
+crystal field splitting and the Hund's rule coupling. The different AFM Mott
+insulator, PM metal and orbital insulating phase are none, partially and fully
+orbital polarized, respectively. For a small $J_{H}$ and a finite crystal
+field, the orbital insulator is robust. Although the system is nonmagnetic, the
+phase boundary of the orbital insulator transition obviously shifts to the
+small $U$ regime after the magnetic correlations is taken into account. These
+results demonstrate that large crystal field splitting favors the formation of
+the orbital insulating phase, while large Hund's rule coupling tends to destroy
+it, driving the low-spin to high-spin transition.",1104.4599v1
+2022-01-31,Precisely computing bound orbits of spinning bodies around black holes II: Generic orbits,"In this paper, we continue our study of the motion of spinning test bodies
+orbiting Kerr black holes. Non-spinning test bodies follow geodesics of the
+spacetime in which they move. A test body's spin couples to the curvature of
+that spacetime, introducing a ""spin-curvature force"" which pushes the body's
+worldline away from a geodesic trajectory. The spin-curvature force is an
+important example of a post-geodesic effect which must be modeled carefully in
+order to accurately characterize the motion of bodies orbiting black holes. One
+motivation for this work is to understand how to include such effects in models
+of gravitational waves produced from the inspiral of stellar mass bodies into
+massive black holes. In this paper's predecessor, we describe a technique for
+computing bound orbits of spinning bodies around black holes with a
+frequency-domain description which can be solved very precisely. In that paper,
+we present an overview of our methods, as well as present results for orbits
+which are eccentric and nearly equatorial (i.e., the orbit's motion is no more
+than $\mathcal{O}(S)$ out of the equatorial plane). In this paper, we apply
+this formulation to the fully generic case -- orbits which are inclined and
+eccentric, with the small body's spin arbitrarily oriented. We compute the
+trajectories which such orbits follow, and compute how the small body's spin
+affects important quantities such as the observable orbital frequencies
+$\Omega_r$, $\Omega_\theta$ and $\Omega_\phi$.",2201.13335v2
+1999-12-11,Low-energy behavior of the spin-tube and spin-orbital models,"The low-energy effective Hamiltonian of three coupled spin chains with
+periodic boundary conditions (spin tube) is expressed, in the limit of strong
+interchain coupling, in terms of XXZ chains coupled by biquadratic exchange
+interaction. A similar class of models was proposed to describe the coupling of
+spins to orbital degrees of freedom in materials such as NaV2O5. We investigate
+these models by means of bosonization and renormalization group techniques, and
+find that the generic phase diagram comprises a gapless region and gapped
+regions consisting of a spin liquid phase and various antiferromagnetic phases.
+We discuss the properties of the spin liquid phase, in particular the nature of
+the ground state and of the elementary excitations above it. We then study the
+effect of a magnetic field, and conclude that a strong enough magnetic field
+can suppress the dimerized phase leading to a two component Luttinger liquid.
+The critical exponents at the transition gapful-gapless are calculated and
+shown to be non-universal in the spin tube case as well as in the generic spin
+orbital problem.",9912200v1
+2016-01-29,Crossover to the Anomalous Quantum Regime in the Extrinsic Spin Hall Effect of Graphene,"Recent reports of spin-orbit coupling enhancement in chemically modified
+graphene have opened doors to studies of the spin Hall effect with massless
+chiral fermions. Here, we theoretically investigate the interaction and
+impurity density dependence of the extrinsic spin Hall effect in spin-orbit
+coupled graphene. We present a nonperturbative quantum diagrammatic calculation
+of the spin Hall response function in the strong-coupling regime that
+incorporates skew scattering and anomalous impurity density-independent
+contributions on equal footing. The spin Hall conductivity dependence on Fermi
+energy and electron-impurity interaction strength reveals the existence of
+experimentally accessible regions where anomalous quantum processes dominate.
+Our findings suggest that spin-orbit-coupled graphene is an ideal model system
+for probing the competition between semiclassical and bona fide quantum
+scattering mechanisms underlying the spin Hall effect.",1601.08076v2
+2012-08-06,Microscopic theory for the Doppler velocimetry of spin propagation in semiconductor quantum wells,"We provide a microscopic theory for the Doppler velocimetry of spin
+propagation in the presence of spatial inhomogeneity, driving electric field
+and the spin orbit coupling in semiconductor quantum wells in a wide range of
+temperature regime based on the kinetic spin Bloch equation. It is analytically
+shown that under an applied electric field, the spin density wave gains a
+time-dependent phase shift $\phi(t)$. Without the spin-orbit coupling, the
+phase shift increases linearly with time and is equivalent to a normal Doppler
+shift in optical measurements. Due to the joint effect of spin-orbit coupling
+and the applied electric field, the phase shift behaviors differently at the
+early and the later stages. At the early stage, the phase shifts are the same
+with or without the spin-orbit coupling. While at the later stage, the phase
+shift deviates from the normal Doppler one when the spin-orbit coupling is
+present. The crossover time from the early normal Doppler behavior to the
+anomalous one at the later stage is inversely proportional to the spin
+diffusion coefficient, wave vector of the spin density wave and the spin-orbit
+coupling strength. In the high temperature regime, the crossover time becomes
+large as a result of the decreased spin diffusion coefficient. The analytic
+results capture all the quantitative features of the experimental results,
+while the full numerical calculations agree quantitatively well with the
+experimental data obtained from the Doppler velocimetry of spin propagation
+[Yang {\it et al.}, Nat. Phys. {\bf 8}, 153 (2012)]. We further predict that
+the coherent spin precession, originally thought to be broken down at high
+temperature, is robust up to the room temperature for narrow quantum wells. We
+point out that one has to carry out the experiments longer to see the effect of
+the coherent spin precession at higher temperature due to the larger crossover
+time.",1208.1081v2
+2015-01-03,Exact results for itinerant ferromagnetism in a $t_{2g}$ orbital system on cubic and square lattices,"We study itinerant ferromagnetism in a $t_{2g}$ multi-orbital Hubbard system
+in the cubic lattice, which consists of three planar oriented orbital bands of
+$d_{xy}$, $d_{yz}$, and $d_{zx}$. Electrons in each orbital band can only move
+within a two-dimensional plane in the three-dimensional lattice parallel to the
+corresponding orbital orientation. Electrons of different orbitals interact
+through the on-site multi-orbital interactions including Hund's coupling. The
+strong coupling limit is considered in which there are no doubly occupied
+orbitals but multiple on-site occupations are allowed. We show that, in the
+case in which there is one and only one hole for each orbital band in each
+layer parallel to the orbital orientation, the ground state is a fully
+spin-polarized itinerant ferromagnetic state, which is unique apart from the
+trivial spin degeneracy. When the lattice is reduced into a single
+two-dimensional layer, the $d_{zx}$ and $d_{yz}$ bands become
+quasi-one-dimensional while the $d_{xy}$ band remains two-dimensional. The
+ground state ferromagnetism also appears in the strong-coupling limit as a
+generalization of the double exchange mechanism. Possible applications to the
+systems of SrRuO$_3$ and LaAlO$_3$/SrTiO$_3$ interface are discussed.",1501.00536v2
+2005-12-19,Intrinsic vs. Extrinsic Spin Currents. Old Ideas in a New Light,"We have described the electron spin dynamics in the presence of Rashba spin-
+orbit interaction and disorder using the spin-density matrix method. We showed
+that in the Born approximation in the scattering amplitude the spin current is
+zero for an arbitrary ratio of the spin-orbit splitting and the scattering rate
+and for an arbitrary disorder potential. We also describe some magnetotransport
+phenomena such as negative magnetoresistance and a negative charge Hall effect
+which occur in the presence of spin-orbit coupling.",0512458v1
+2018-11-13,Spin and Charge Transport of Multi-Orbital Quantum Spin Hall Insulators,"The fabrication of bismuthene on top of SiC paved the way for substrate
+engineering of room temperature quantum spin Hall insulators made of group V
+atoms. We perform large-scale quantum transport calculations in these 2d
+materials to analyse the rich phenomenology that arises from the interplay
+between topology, disorder, valley and spin degrees of freedom. For this
+purpose, we consider a minimal multi-orbital real-space tight-binding
+hamiltonian and use a Chebyshev polynomial expansion technique. We discuss how
+the quantum spin Hall states are affected by disorder, sublattice resolved
+potential and Rashba spin-orbit coupling.",1811.05054v1
+2019-01-17,Novel Block Excitonic Condensate at $n=3.5$ in a Spin-Orbit Coupled $t_{2g}$ Multiorbital Hubbard Model,"Theoretical studies recently predicted the condensation of spin-orbit
+excitons at momentum $q$=$\pi$ in $t_{2g}^4$ spin-orbit coupled three-orbital
+Hubbard models at electronic density $n=4$. In parallel, experiments involving
+iridates with non-integer valence states for the Ir ions are starting to
+attract considerable attention. In this publication, using the density matrix
+renormalization group technique we present evidence for the existence of a
+novel excitonic condensate at $n=3.5$ in a one-dimensional Hubbard model with a
+degenerate $t_{2g}$ sector, when in the presence of spin-orbit coupling. At
+intermediate Hubbard $U$ and spin-orbit $\lambda$ couplings, we found an
+excitonic condensate at the unexpected momentum $q$=$\pi/2$ involving
+$j_{\textrm{eff}}=3/2,m=\pm1/2$ and $j_{\textrm{eff}}=1/2,m=\pm1/2$ bands in
+the triplet channel, coexisting with an also unexpected block magnetic order.
+We also present the entire $\lambda$ vs $U$ phase diagram, at a fixed and
+robust Hund coupling. Interestingly, this new `block excitonic phase' is
+present even at large values of $\lambda$, unlike the $n=4$ excitonic phase
+discussed before. Our computational study helps to understand and predict the
+possible magnetic phases of materials with $d^{3.5}$ valence and robust
+spin-orbit coupling.",1901.05578v1
+2016-01-12,The effects of electron correlation and spin-orbit coupling in the isovalent Pd-doped superconductor SrPt$_3$P,"We present a systematical study on the roles of electron correlation and
+spin-orbit coupling in the isovalent Pd-doped superconductor SrPt$_3$P. By
+using solid state reaction method, we fabricated the strong spin-orbit coupling
+superconductors Sr(Pt$_{1-x}$Pd$_x$)$_3$P with strong electron correlated Pd
+dopant of the $4d$ orbital. As increasing the isovalent Pd concentrations
+without introducing any extra electron/hole carriers, the superconducting
+transition temperature $T_c$ decreases monotonously, which suggests the
+existence of competition between spin-orbit coupling and electron correlation
+in the superconducting state. In addition, the electronic band structure
+calculations demonstrate that the strength of electron susceptibility is
+suppressed gradually by the Pd dopant suggesting the incompatible relation
+between spin-orbit coupling and electron correlation, which is also consistent
+with experimental measurements. Our results provide significant insights in the
+natures of the interplay between the spin-orbit coupling and the electron
+correlation in superconductivity, and may pave a way for understanding the
+mechanism of superconductivity in this 5d-metal-based compound.",1601.02782v1
+2011-07-13,Observation of the inverse spin Hall effect in silicon,"The spin-orbit interaction in a solid couples the spin of an electron to its
+momentum. This coupling gives rise to mutual conversion between spin and charge
+currents: the direct and inverse spin Hall effects. The spin Hall effects have
+been observed in metals and semiconductors. However, the spin/charge conversion
+has not been realized in one of the most fundamental semiconductors, silicon,
+where accessing the spin Hall effects has been believed to be difficult because
+of its very weak spin-orbit interaction. Here we report observation of the
+inverse spin Hall effect in silicon at room temperature. The spin/charge
+current conversion efficiency, the spin Hall angle, is obtained as 0.0001 for a
+p-type silicon film. In spite of the small spin Hall angle, we found a clear
+electric voltage due to the inverse spin Hall effect in the p-Si film,
+demonstrating that silicon can be used as a spin-current detector.",1107.2585v2
+2018-05-21,Tunable spinful matter wave valve,"We investigate the transport problem that a spinful matter wave is incident
+on a strong localized spin-orbit-coupled Bose-Einstein condensate in optical
+lattices, where the localization is admitted by atom interaction only existing
+at one particular site, and the spin-orbit coupling arouse spatial rotation of
+the spin texture. We find that tuning the spin orientation of the localized
+Bose-Einstein condensate can lead to spin-nonreciprocal / spin-reciprocal
+transport, meaning the transport properties are dependent on / independent of
+the spin orientation of incident waves. In the former case, we obtain the
+conditions to achieve transparency, beam-splitting, and blockade of the
+incident wave with a given spin orientation, and furthermore the ones to
+perfectly isolate incident waves of different spin orientation, while in the
+latter, we obtain the condition to maximize the conversion of different spin
+states. The result may be useful to develop a novel spinful matter wave valve
+that integrates spin switcher, beam-splitter, isolator, and converter. The
+method can also be applied to other real systems, e.g., realizing perfect
+isolation of spin states in magnetism, which is otherwise rather difficult.",1805.08129v1
+2015-06-30,Experimental Demonstration of Efficient Spin-Orbit Torque Switching of an MTJ with sub-100 ns Pulses,"Efficient generation of spin currents from charge currents is of high
+importance for memory and logic applications of spintronics. In particular,
+generation of spin currents from charge currents in high spin-orbit coupling
+metals has the potential to provide a scalable solution for embedded memory. We
+demonstrate a net reduction in critical charge current for spin torque driven
+magnetization reversal via using spin-orbit mediated spin current generation.
+We scaled the dimensions of the spin-orbit electrode to 400 nm and the
+nanomagnet to 270 nm x 68 nm in a three terminal spin-orbit torque, magnetic
+tunnel junction (SOT-MTJ) geometry. Our estimated effective spin Hall angle is
+0.15-0.20 using the ratio of zero temperature critical current from spin Hall
+switching and estimated spin current density for switching the magnet. We show
+bidirectional transient switching using spin-orbit generated spin torque at 100
+ns switching pulses reliably followed by transient read operations. We finally
+compare the static and dynamic response of the SOT-MTJ with transient spin
+circuit modeling showing the performance of scaled SOT-MTJs to enable
+nanosecond class non-volatile MTJs.",1506.09177v4
+2007-07-31,Theory of spin qubits in nanostructures,"We review recent advances on the theory of spin qubits in nanostructures. We
+focus on four selected topics. First, we show how to form spin qubits in the
+new and promising material graphene. Afterwards, we discuss spin relaxation and
+decoherence in quantum dots. In particular, we demonstrate how charge
+fluctations in the surrounding environment cause spin decay via spin--orbit
+coupling. We then turn to a brief overview of how one can use electron-dipole
+spin resonance (EDSR) to perform single spin rotations in quantum dots using an
+oscillating electric field. The final topic we cover is the spin-spin coupling
+via spin-orbit interaction which is an alternative to the usual spin-spin
+coupling via the Heisenberg exchange interaction.",0707.4622v1
+2018-06-07,Strong and Tunable Spin Lifetime Anisotropy in Dual-Gated Bilayer Graphene,"We report the discovery of a strong and tunable spin lifetime anisotropy with
+excellent spin lifetimes up to 7.8 ns in dual-gated bilayer graphene.
+Remarkably, this realizes the manipulation of spins in graphene by
+electrically-controlled spin-orbit fields, which is unexpected due to
+graphene's weak intrinsic spin-orbit coupling. We utilize both the in-plane
+magnetic field Hanle precession and oblique Hanle precession measurements to
+directly compare the lifetimes of out-of-plane vs. in-plane spins. We find that
+near the charge neutrality point, the application of a perpendicular electric
+field opens a band gap and generates an out-of-plane spin-orbit field that
+stabilizes out-of-plane spins against spin relaxation, leading to a large spin
+lifetime anisotropy. This intriguing behavior occurs because of the unique
+spin-valley coupled band structure of bilayer graphene. Our results demonstrate
+the potential for highly tunable spintronic devices based on dual-gated 2D
+materials.",1806.02477v1
+2023-07-22,Dense plasma irradiated platinum with improved spin Hall effect,"The impurity incorporation in host high-spin orbit coupling materials like
+platinum has shown improved charge-to-spin conversion by modifying the up-spin
+and down-spin electron trajectories by bending or skewing them in opposite
+directions. This enables efficient generation, manipulation, and transport of
+spin currents. In this study, we irradiate the platinum with non-focus dense
+plasma to incorporate the oxygen ion species. We systematically analyze the
+spin Hall angle of the oxygen plasma irradiated Pt films using spin torque
+ferromagnetic resonance. Our results demonstrate a 2.4 times enhancement in the
+spin Hall effect after plasma treatment of Pt as compared to pristine Pt. This
+improvement is attributed to the introduction of disorder and defects in the Pt
+lattice, which enhances the spin-orbit coupling and leads to more efficient
+charge-to-spin conversion without breaking the spin-orbit torque symmetries.
+Our findings offer a new method of dense plasma-based modification of material
+for the development of advanced spintronic devices based on Pt and other heavy
+metals.",2307.12139v1
+2023-06-28,Universal theory of spin-momentum-orbital-site locking,"Spin textures, i.e., the distribution of spin polarization vectors in
+reciprocal space, exhibit diverse patterns determined by symmetry constraints,
+resulting in a variety of spintronic phenomena. Here, we propose a universal
+theory to comprehensively describe the nature of spin textures by incorporating
+three symmetry flavors of reciprocal wavevector, atomic orbital and atomic
+site. Such approach enables us to establish a complete classification of spin
+textures constrained by the little co-group and predict unprecedentedly
+reported spin texture types, such as Zeeman-type spin splitting in
+antiferromagnets and quadratic spin texture. To examine the impact of atomic
+orbitals and sites, we predict orbital-dependent spin texture and anisotropic
+spin-momentum-site locking effects and corresponding material candidates
+validated through first-principles calculations. Our theory not only covers all
+possible spin textures in crystal solids described by magnetic space groups,
+but also introduces new possibilities for designing innovative spin textures by
+the coupling of multiple degrees of freedom.",2306.16312v1
+2014-06-09,Spontaneous Parity Breaking in Spin-Orbital Coupled Systems,"Effects of spontaneous parity breaking by charge, spin, and orbital orders
+are investigated in a two-band Hubbard model on a honeycomb lattice. This is a
+minimal model in which the inter-orbital hopping, atomic spin-orbit coupling,
+and strong electron correlation give rise to fascinating properties, such as
+the magnetoelectric effects, quantum spin Hall effect, and spin or valley
+splitting in the band structure. We perform the symmetry analysis of possible
+broken-parity states and the mean-field analysis of their competition. We find
+that the model at 1/4 filling exhibits a spin-orbital composite ordered state
+and a charge ordered state, in addition to a paramagnetic quantum spin-Hall
+insulator. We show that the composite ordered phase exhibits two types of
+magnetoelectric responses. The charge ordered state shows spin splitting in the
+band structure, while the topological nature varies depending on electron
+correlations.",1406.2093v1
+2019-05-20,Spin dynamics of hot excitons in diluted magnetic semiconductors with spin-orbit interaction,"We explore the impact of a Rashba-type spin-orbit interaction in the
+conduction band on the spin dynamics of hot excitons in diluted magnetic
+semiconductor quantum wells. In materials with strong spin-orbit coupling, we
+identify parameter regimes where spin-orbit effects greatly accelerate the spin
+decay and even change the dynamics qualitatively in the form of damped
+oscillations. Furthermore, we show that the application of a small external
+magnetic field can be used to either mitigate the influence of spin-orbit
+coupling or entirely remove its effects for fields above a material-dependent
+threshold.",1905.07947v3
+2010-05-12,Spin effects in the phasing of gravitational waves from binaries on eccentric orbits,"We compute here the spin-orbit and spin-spin couplings needed for an accurate
+computation of the phasing of gravitational waves emitted by comparable-mass
+binaries on eccentric orbits at the second post-Newtonian (PN) order. We use a
+quasi-Keplerian parametrization of the orbit free of divergencies in the zero
+eccentricity limit. We find that spin-spin couplings induce a residual
+eccentricity for coalescing binaries at 2PN, of the order of
+$10^{-4}$-$10^{-3}$ for supermassive black hole binaries in the LISA band.
+Spin-orbit precession also induces a non-trivial pattern in the evolution of
+the eccentricity, which could help to reduce the errors on the determination of
+the eccentricity and spins in a gravitational wave measurement.",1005.2046v1
+2024-02-19,Emergence of radial Rashba spin-orbit fields in twisted van der Waals heterostructures,"Rashba spin-orbit coupling is a quintessential spin interaction appearing in
+virtually any electronic heterostructure. Its paradigmatic spin texture in the
+momentum space forms a tangential vector field. Using first-principles
+investigations, we demonstrate that in twisted homobilayers and
+hetero-multilayers, the Rashba coupling can be predominantly radial, parallel
+to the momentum. Specifically, we study four experimentally relevant
+structures: twisted bilayer graphene (Gr), twisted bilayer WSe$_2$, and twisted
+multilayers WSe$_2$/Gr/WSe$_2$ and WSe$_2$/Gr/Gr/WSe$_2$. We show, that the
+Rashba spin-orbit field texture in such structures can be controlled by an
+electric field, allowing to tune it from radial to tangential. Such spin-orbit
+engineering should be useful for designing novel spin-charge conversion and
+spin-orbit torque schemes, as well as for controlling correlated phases and
+superconductivity in van der Waals materials.",2402.12353v1
+2008-09-20,Unconventional Bose-Einstein condensations from spin-orbit coupling,"According to the ""no-node"" theorem, many-body ground state wavefunctions of
+conventional Bose-Einstein condensations (BEC) are positive-definite, thus
+time-reversal symmetry cannot be spontaneously broken. We find that
+multi-component bosons with spin-orbit coupling provide an unconventional type
+of BECs beyond this paradigm. We focus on the subtle case of isotropic Rashba
+spin-orbit coupling and the spin-independent interaction. In the limit of the
+weak confining potential, the condensate wavefunctions are frustrated at the
+Hartree-Fock level due to the degeneracy of the Rashba ring. Quantum zero-point
+energy selects the spin-spiral type condensate through the
+""order-from-disorder"" mechanism. In a strong harmonic confining trap, the
+condensate spontaneously generates a half-quantum vortex combined with the
+skyrmion type of spin texture. In both cases, time-reversal symmetry is
+spontaneously broken. These phenomena can be realized in both cold atom systems
+with artificial spin-orbit couplings generated from atom-laser interactions and
+exciton condensates in semi-conductor systems.",0809.3532v5
+2012-10-22,Spin polarization anisotropy in a narrow spin-orbit-coupled nanowire quantum dot,"One and two-electron systems confined in a single and coupled quantum dots
+defined within a nanowire with a finite radius are studied in the context of
+spin-orbit coupling effects. Anisotropy of the spin-orbit interaction is
+discussed in terms of the system geometry and orientation of the external
+magnetic field vector. We find that there are easy and hard spin polarization
+axes and in the quantum dot with strong lateral confinement electron spin
+becomes well defined in spite of the presence of spin-orbit coupling. We
+present an analytical solution for the one-dimensional limit and study its
+validity for nanowires of finite radii by comparing the results with a full
+three-dimensional calculation. The results are also confronted with the recent
+measurements of the effective Lande factor and avoided crossing width
+anisotropy in InSb nanowire quantum dots [S. Nadj-Perge et al., Phys. Rev.
+Lett. 108, 166801 (2012)].",1210.5901v3
+2017-02-17,Spin-orbit torque in MgO/CoFeB/Ta/CoFeB/MgO symmetric structure with interlayer antiferromagnetic coupling,"Spin current generated by spin Hall effect in the heavy metal would diffuse
+up and down to adjacent ferromagnetic layers and exert torque on their
+magnetization, called spin-orbit torque. Antiferromagnetically coupled
+trilayers, namely the so-called synthetic antiferromagnets (SAF), are usually
+employed to serve as the pinned layer of spintronic devices based on spin
+valves and magnetic tunnel junctions to reduce the stray field and/or increase
+the pinning field. Here we investigate the spin-orbit torque in
+MgO/CoFeB/Ta/CoFeB/MgO perpendicularly magnetized multilayer with interlayer
+antiferromagnetic coupling. It is found that the magnetization of two CoFeB
+layers can be switched between two antiparallel states simultaneously. This
+observation is replicated by the theoretical calculations by solving
+Stoner-Wohlfarth model and Landau-Lifshitz-Gilbert equation. Our findings
+combine spin-orbit torque and interlayer coupling, which might advance the
+magnetic memories with low stray field and low power consumption.",1702.05331v1
+2014-03-27,Itinerant magnetism in Weyl spin-orbit coupled Fermi gas,"Magnetic ordering of itinerant fermionic systems is at the forefront of
+condensed matter physics dating back to Stoner's instability. Spin-orbit
+coupling (SOC) which couples two essential ingredients of an itinerant
+fermionic system, namely spin and orbital motion, opens up new horizons to this
+long-standing problem. Here we report that the itinerant ferromagnetism is
+absent in 3D Fermi gas with a Weyl SOC and various itinerant spin density waves
+emerge instead, which is deeply rooted in the unique symmetry and spin-momentum
+locking effect in spin-orbit coupled systems. What is more appealing is that,
+the strong SOC provides a new and efficient mechanism to realize itinerant spin
+density waves at extremely weak repulsion---a significant benefit for present
+ultra-cold atom experiment. These novel phenomena can be probed by Bragg
+spectroscopy, time of flight imaging and {\sl In-Situ } measurements in
+ultra-cold atom experiment.",1403.7031v6
+2017-01-18,Finite Temperature Phases of Two Dimensional Spin-Orbit Coupled Bosons,"We determine the finite temperature phase diagram of two dimensional bosons
+with two hyperfine (pseudo-spin) states coupled via Rashba-Dresselhaus
+spin-orbit interaction using classical field Monte Carlo calculations. For
+anisotropic spin-orbit coupling, we find a transition to a
+Berenzinskii-Kosterlitz-Thouless superfluid phase with quasi-long range order.
+We show that the spin-order of the quasi-condensate is driven by the anisotropy
+of interparticle interaction, favoring either a homogeneous plane wave state or
+stripe phase with broken translational symmetry. Both phases show
+characteristic behavior in the algebraically decaying spin density correlation
+function. For fully isotropic interparticle interaction, our calculations
+indicate a fractionalized quasi-condensate where the mean-field degeneracy of
+plane wave and stripe phase remains robust against critical fluctuations. In
+the case of fully isotropic spin-orbit coupling, the circular degeneracy of the
+single particle ground state destroys the algebraic ordered phase in the
+thermodynamic limit, but a cross-over remains for finite size systems.",1701.05002v1
+2017-07-17,Interfacial Rashba magnetoresistance of two-dimensional electron gas at LaAlO$_3$/SrTiO$_3$ interface,"We report the angular dependence of magnetoresistance in two-dimensional
+electron gas at LaAlO$_3$/SrTiO$_3$ interface. We find that this interfacial
+magnetoresistance exhibits a similar angular dependence to the spin Hall
+magnetoresistance observed in ferromagnet/heavy metal bilayers, which has been
+so far discussed in the framework of bulk spin Hall effect of heavy metal
+layer. The observed magnetoresistance is in qualitative agreement with
+theoretical model calculation including both Rashba spin-orbit coupling and
+exchange interaction. Our result suggests that magnetic interfaces subject to
+spin-orbit coupling can generate a nonnegligible contribution to the spin Hall
+magnetoresistance and the interfacial spin-orbit coupling effect is therefore
+key to the understanding of various spin-orbit-coupling-related phenomena in
+magnetic/non-magnetic bilayers.",1707.04977v1
+2021-04-27,Magnon modes as a joint effect of surface ferromagnetism and spin-orbite coupling in CoSi chiral topological semimetal,"CoSi single crystal is a known realization of a chiral topological semimetal
+with simultaneously broken mirror and inversion symmetries. In addition to the
+symmetry-induced spin-orbit coupling, surface ferromagnetism is known in
+nominally diamagnetic CoSi structures, which appears due to the distorted bonds
+and ordered vacancies near the surface. We experimentally investigate electron
+transport through a thin CoSi flake at high current density. Surprisingly, we
+demonstrate $dV/dI(I)$ curves which are qualitatively similar to ones for
+ferromagnetic multilayers with characteristic $dV/dI$ magnon peaks and
+unconventional magnetic field evolution of the peaks' positions. We understand
+these observations as a result of current-induced spin polarization due to the
+significant spin-orbit coupling in CoSi. Scattering of non-equilibrium
+spin-polarized carriers within the surface ferromagnetic layer is responsible
+for the precessing spin-wave excitations, so the observed magnon modes are the
+joint effect of surface ferromagnetism and spin-orbit coupling in a CoSi chiral
+topological semimetal. Thus, thin CoSi flakes behave as magnetic conductors
+with broken inversion symmetry, which is important for different spintronic
+phenomena.",2104.13252v1
+2021-09-14,Magnon Condensation in Dimerized Antiferromagnets with Spin-Orbit Coupling,"Bose-Einstein condensation (BEC) of triplet excitations triggered by a
+magnetic field, sometimes called magnon BEC, in dimerized antiferromagnets
+gives rise to a long-range antiferromagnetic order in the plane perpendicular
+to the applied magnetic field. To explore the effects of spin-orbit coupling on
+magnon condensation, we study a spin model on a distorted honeycomb lattice
+with dimerized Heisenberg exchange ($J$ terms) and uniform off-diagonal
+exchange ($\Gamma'$ terms) interactions. Via variational Monte Carlo
+calculations and spin-wave theory, we find that an out-of-plane magnetic field
+can induce different types of long-range magnetic orders, no matter if the
+ground state is a non-magnetic dimerized state or an ordered N\'{e}el state.
+Furthermore, the critical properties of field-driven phase transitions in the
+presence of spin-orbit couplings, as illustrated from spin-wave spectrum and
+interpreted by effective field theory, can be different from the conventional
+magnon BEC. Our study is helpful to understand the rich phases of spin-orbit
+coupled antiferromagnets induced by magnetic fields.",2109.06518v2
+2022-05-16,Chiral anomaly in noncentrosymmetric systems induced by spin-orbit coupling,"The chiral anomaly may be realized in condensed matter systems with pairs of
+Weyl points. Here we show that the chiral anomaly can be realized in diverse
+noncentrosymmetric systems even without Weyl point pairs when spin-orbit
+coupling induces nonzero Berry curvature flux through Fermi surfaces. This
+motivates the condensed matter chiral anomaly to be interpreted as a Fermi
+surface property rather than a Weyl point property. The
+spin-orbit-coupling-induced anomaly reproduces the well-known charge transport
+properties of the chiral anomaly such as the negative longitudinal
+magnetoresistance and the planar Hall effect in Weyl semimetals. Since it is of
+spin-orbit coupling origin, it also affects the spin transport and gives rise
+to anomaly-induced longitudinal spin currents and the magnetic spin Hall
+effect, which are absent in conventional Weyl semimetals.",2205.07451v2
+2022-09-21,Spin-orbit-coupled spinor gap solitons in Bose-Einstein condensates,"Spin-1 spin-orbit-coupled spinor Bose-Einstein condensates have been realized
+in experiment. We study spin-orbit-coupled spinor gap solitons in this
+experimentally realizable system with an optical lattice. The spin-dependent
+parity symmetry of the spin-orbit coupling plays an important role in
+properties of gap solitons. Two families of solitons with opposite
+spin-dependent parity are found. Using an approximating model by replacing the
+optical lattice with a Harmonic trap, we demonstrate the physical origination
+of these two families. For a large negative quadratic Zeeman shift, we also
+find a type of gap solitons that spontaneously breaks the spin-dependent parity
+symmetry due to the ferromagnetic spinor interactions.",2209.10190v2
+2023-02-28,Quantum phases in spin-orbit-coupled Floquet spinor Bose gases,"We propose a spin-orbit-coupled Floquet spinor Bose-Einstein condensate (BEC)
+which can be implemented by Floquet engineering of a quadratic Zeeman field.
+The Floquet spinor BEC has a Bessel-function-modulated Rabi frequency and a
+Floquet-induced spin-exchange interaction. The quantum phase diagram of the
+spin-orbit-coupled Floquet spinor BEC is investigated by considering
+antiferromagnetic or ferromagnetic spin-spin interactions. In comparison with
+the usual spin-orbit-coupled spin-1 BEC, we find that a stripe phase for
+antiferromagnetic interactions can exist in a large quadratic Zeeman field
+regime, and a different stripe phase with an experimentally favorable contrast
+for ferromagnetic interactions is uncovered.",2302.14232v2
+2023-06-21,Topological state transitions in electromagnetic topological defects,"The recent emergence of electromagnetic topological defects has attracted
+wide interest in fields from topological photonics to deep-subwavelength
+light-mater interactions. Previously, much of the research has focused on
+constructing specific topological defects but the fundamental theory describing
+the physical mechanisms underlying their formation and transitions is lacking.
+Here, we present a spin-orbit coupling based theory describing such mechanisms
+for various configurations of spin topological defects in confined
+electromagnetic fields. The results reveal that their formation originates from
+the conservation of total angular momentum and that their transitions are
+determined by anisotropic spin-orbit couplings. By engineering the spin-orbit
+couplings, we observe the formation and transitions of Neel-type, twisted-type,
+and Bloch-type spin topological defects in confined electromagnetic fields. A
+stable Block-type spin topological defect is reported for the first time. Our
+theory can also describe the transitions of field topological defects. The
+findings enrich the portfolio of electromagnetic topological defects, deepen
+our understanding of conserved laws, spin-orbit couplings and transitions of
+topological defects in confined electromagnetic systems, and predict
+applications in high-density optical data transmissions and chiral quantum
+optics.",2306.12024v1
+2007-09-16,Measurement of Rashba and Dresselhaus spin-orbit magnetic fields,"Spin-orbit coupling is a manifestation of special relativity. In the
+reference frame of a moving electron, electric fields transform into magnetic
+fields, which interact with the electron spin and lift the degeneracy of
+spin-up and spin-down states. In solid-state systems, the resulting spin-orbit
+fields are referred to as Dresselhaus or Rashba fields, depending on whether
+the electric fields originate from bulk or structure inversion asymmetry,
+respectively. Yet, it remains a challenge to determine the absolute value of
+both contributions in a single sample. Here we show that both fields can be
+measured by optically monitoring the angular dependence of the electrons' spin
+precession on their direction of movement with respect to the crystal lattice.
+Furthermore, we demonstrate spin resonance induced by the spin-orbit fields. We
+apply our method to GaAs/InGaAs quantum-well electrons, but it can be used
+universally to characterise spin-orbit interactions in semiconductors,
+facilitating the design of spintronic devices.",0709.2509v1
+2016-07-22,Spin-orbit interaction in relativistic nuclear structure models,"Relativistic self-consistent mean-field (SCMF) models naturally account for
+the coupling of the nucleon spin to its orbital motion, whereas
+non-relativistic SCMF methods necessitate a phenomenological ansatz for the
+effective spin-orbit potential. Recent experimental studies aim to explore the
+isospin properties of the effective spin-orbit interaction in nuclei. SCMF
+models are very useful in the interpretation of the corresponding data, however
+standard relativistic mean-field and non-relativistic Hartree-Fock models use
+effective spin-orbit potentials with different isovector properties, mainly
+because exchange contributions are not treated explicitly in the former. The
+impact of exchange terms on the effective spin-orbit potential in relativistic
+mean-field models is analysed, and it is shown that it leads to an isovector
+structure similar to the one used in standard non-relativistic Hartree-Fock.
+Data on the isospin dependence of spin-orbit splittings in spherical nuclei
+could be used to constrain the isovector-scalar channel of relativistic
+mean-field models. The reproduction of the empirical kink in the isotope shifts
+of even Pb nuclei by relativistic effective interactions points to the
+occurrence of pseudospin symmetry in the single-neutron spectra in these
+nuclei.",1607.06567v1
+2001-10-22,Magnetoconductance of a two-dimensional metal in the presence of spin-orbit coupling,"We show that in the metallic phase of a two dimensional electron gas the
+spin-orbit coupling due to structure inversion asymmetry leads to a
+characteristic anisotropy in the magnetoconductance. Within the assumption that
+the metallic phase can be described by a Fermi liquid, we compute the
+conductivity in the presence of an in-plane magnetic field. Both the spin-orbit
+coupling and the Zeeman coupling with the magnetic field give rise to two spin
+subbands, in terms of which most of the transport properties can be discussed.
+  The strongest conductivity anisotropy occurs for Zeeman energies of the order
+of the Fermi energy corresponding to the depopulation of the upper spin
+subband. The energy scale associated with the spin-orbit coupling controls the
+strength of the effect. More in particular, we find that the detailed behavior
+and the sign of the anisotropy depends on the underlying scattering mechanism.
+Assuming small angle scattering to be the dominant scattering mechanism our
+results agree with recent measurement on Si-MOSFET's in the vicinity of the
+metal-insulator transition.",0110454v1
+2018-02-28,Beliaev Damping in Spin-$\frac{1}{2}$ Interacting Bosons with Spin-Orbit Coupling,"Beliaev damping provides one of the most important mechanisms for dissipation
+of quasiparticles through beyond-mean-field effects at zero temperature. Here
+we present the first analytical result of Beliaev damping in low-energy
+excitations of spin-$\frac{1}{2}$ interacting bosons with equal Rashba and
+Dresslhaus spin-orbit couplings. We identify novel features of Beliaev decay
+rate due to spin-orbit coupling, in particular, it shows explicit dependence on
+the spin-density interaction and diverges at the interaction-modified phase
+boundary between the zero-momentum and plane-wave phases. This represents a
+manifestation of the effect of spin-orbit coupling in the beyond-mean-field
+regime, which by breaking Galilean invariance couples excitations in the
+density- and spin-channels. By describing the Beliaev damping in terms of the
+observable dynamic structure factors, our results allow direct experimental
+access within current facilities.",1802.10295v1
+2019-04-11,Spin-exchange-induced exotic superfluids in a Bose-Fermi spinor mixture,"We consider a mixture of spin-1/2 bosons and fermions, where only the bosons
+are subjected to the spin-orbit coupling induced by Raman beams. The fermions,
+although not directly coupled to the Raman lasers, acquire an effective
+spin-orbit coupling through the spin-exchange interaction between the two
+species. Our calculation shows that this is a promising way of obtaining
+spin-orbit coupled Fermi gas without Raman-induced heating, where the
+long-sought topological Fermi superfluids and topological bands can be
+realized. Conversely, we find that the presence of fermions not only provides a
+new way to create the supersolid stripe phase of the bosons, but more
+strikingly it can also greatly increase the spatial period of the bosonic
+density stripes, and hence makes this phase directly observable in the
+experiment. This system provides a new and practical platform to explore the
+physics of spin-orbit coupling, which possesses a dynamic nature through the
+interaction between the two species.",1904.05486v2
+2021-08-04,Manipulating polariton condensates by Rashba-Dresselhaus coupling at room temperature,"The spin-orbit coupling plays an important role in the spin Hall effect and
+the topological insulators. In addition, the spin-orbit coupled Bose-Einstein
+condensates show remarkable quantum many-body phase transition. In this work we
+tune the exciton polariton condensate by virtue of the Rashba-Dresselhaus (RD)
+spin-orbit coupling in a liquid-crystal filled microcavity where perovskite
+CsPbBr3 microplates act as the gain material at room temperature. We realize an
+artificial gauge field on the CsPbBr3 exciton polariton condensate, which
+splits the condensates with opposite spins in both momentum and real spaces.
+Our work paves the way to manipulate the exciton polariton condensate with a
+synthetic gauge field based on the RD spin-orbit coupling at room temperature.",2108.02057v2
+2014-11-06,Spin - orbital-angular-momentum coupling in Bose-Einstein condensates,"Spin-orbit coupling (SOC) plays a crucial role in many branches of physics.
+In this context, the recent experimental realization of the coupling between
+spin and linear momentum of ultracold atoms opens a completely new avenue for
+exploring new spin-related superfluid physics. Here we propose that another
+important and fundamental SOC, the coupling between spin and orbital angular
+momentum (SOAM), can be implemented for ultracold atoms using higher-order
+Laguerre-Gaussian laser beams to induce Raman coupling between two hyperfine
+spin states of atoms. We study the ground-state phase diagrams of SOAM-coupled
+Bose-Einstein condensates on a ring trap and explore their applications in
+gravitational force detection. Our results may provide the basis for further
+investigation of intriguing superfluid physics induced by SOAM coupling, such
+as collective excitations.",1411.1737v3
+2007-05-03,Coupled spin-charge drift-diffusion equations for the Rashba model,"Coupled spin-charge drift-diffusion equations are derived for a biased
+two-dimensional electron gas with weak Rashba spin-orbit interaction. The basic
+equations formally agree with recent results obtained for spin-orbit coupled
+small polarons. It is shown that effects of an in-plane electric field on a
+homogeneous spin system can completely be described by an associated in-plane
+magnetic field. Exploiting this analogy, we predict among other things the
+electric-field equivalent of the Hanle effect.",0705.0415v1
+2010-11-17,Magnetotransport and spin dynamics in an electron gas formed at oxide interfaces,"We investigate the spin-dependent transport properties of a two-dimensional
+electron gas formed at oxides' interface in the presence of a magnetic field.
+We consider several scenarios for the oxides' properties, including oxides with
+co-linear or spiral magnetic and ferroelectric order. For spiral multiferroic
+oxides, the magnetoelectric coupling and the topology of the localized magnetic
+moments introduce additional, electric field controlled spin-orbit coupling
+that affects the magneto-oscillation of the current. An interplay of this
+spin-orbit coupling, the exchange field, and of the applied magnetic field
+results in a quantum, gate-controlled spin and charge Hall conductance.",1011.3924v1
+2004-04-30,"Orbital and spin interplay in spin-gap formation in pyroxene titanium oxides ATiSi2O6 (A=Na, Li)","Interplay between orbital and spin degrees of freedom is theoretically
+studied for the phase transition to the spin-singlet state with lattice
+dimerization in pyroxene titanium oxides ATiSi2O6 (A=Na, Li). For the quasi
+one-dimensional spin-1/2 systems, we derive an effective spin-orbital-lattice
+coupled model in the strong correlation limit with explicitly taking account of
+the t_2g orbital degeneracy, and investigate the model by numerical simulation
+as well as the mean-field analysis. We find a nontrivial feedback effect
+between orbital and spin degrees of freedom; as temperature decreases,
+development of antiferromagnetic spin correlations changes the sign of orbital
+correlations from antiferro to ferro type, and finally the ferro-type orbital
+correlations induce the dimerization and the spin-singlet formation. As a
+result of this interplay, the system undergoes a finite-temperature transition
+to the spin-dimer and orbital-ferro ordered phase concomitant with the
+Jahn-Teller lattice distortion. The numerical results for the magnetic
+susceptibility show a deviation from the Curie-Weiss behavior, and well
+reproduce the experimental data. The results reveal that the Jahn-Teller energy
+scale is considerably small and the orbital and spin exchange interactions play
+a decisive role in the pyroxene titanium oxides.",0404730v2
+2013-01-11,A new type of nuclear collective motion - the spin scissors mode,"The coupled dynamics of low lying modes and various giant resonances are
+studied with the help of the Wigner Function Moments method on the basis of
+Time Dependent Hartree-Fock equations in the harmonic oscillator model
+including spin-orbit potential plus quadrupole-quadrupole and spin-spin
+residual interactions. New low lying spin dependent modes are analyzed. Special
+attention is paid to the spin scissors mode.",1301.2513v1
+2013-06-13,Electrical control of phonon mediated spin relaxation rate in semiconductor quantum dots: the Rashba vs the Dresselhaus spin-orbit couplings,"In symmetric quantum dots (QDs), it is well known that the spin-hot spot
+(i.e., the cusp-like structure due to the presence of degeneracy near the level
+or anticrossing point) is present for the pure Rashba case but is absent for
+the pure Dresselhaus case [Phys. Rev. Lett. 95, 076805 (2005)]. Since the
+Dresselhaus spin-orbit coupling dominates over the Rashba spin-orbit coupling
+in GaAs and GaSb QDs, it is important to find the exact location of the
+spin-hot spot or the cusp-like structure even for the pure Dresselhaus case. In
+this paper, for the first time, we present analytical and numerical results
+that show that the spin-hot spot can also be seen for the pure Dresselhaus
+spin-orbit coupling case by inducing large anisotropy through external gates.
+At or nearby the spin-hot spot, the spin transition rate enhances and the
+decoherence time reduces by several orders of magnitude compared to the case
+with no spin-hot spot. Thus one should avoid such locations when designing QD
+spin based transistors for the possible implementation in quantum logic gates,
+solid state quantum computing and quantum information processing. It is also
+possible to extract the exact experimental data (Phys. Rev. Lett. 100, 046803
+(2008)) for the phonon mediated spin-flip rates from our developed theoretical
+model.",1306.3135v1
+2007-05-18,Magnetoresistance due to edge spin accumulation,"Because of spin-orbit interaction, an electrical current is accompanied by a
+spin current resulting in spin accumulation near the sample edges. Due again to
+spin-orbit interaction this causes a small decrease of the sample resistance.
+An applied magnetic field will destroy the edge spin polarization leading to a
+positive magnetoresistance. This effect provides means to study spin
+accumulation by electrical measurements. The origin and the general properties
+of the phenomenological equations describing coupling between charge and spin
+currents are also discussed.",0705.2738v2
+2007-05-22,Spin dynamics in rolled-up two dimensional electron gases,"A curved two dimensional electron gas with spin-orbit interactions due to the
+radial confinement asymmetry is considered. At certain relation between the
+spin-orbit coupling strength and curvature radius the tangential component of
+the electron spin becomes a conserved quantity for any spin-independent
+scattering potential that leads to a number of interesting effects such as
+persistent spin helix and strong anisotropy of spin relaxation times. The
+effect proposed can be utilized in the non-ballistic spin-field-effect
+transistors.",0705.3174v1
+2016-05-10,Controlling Spin-Polarization in Graphene by Cloaking Magnetic and Spin-Orbit Scatterers,"We consider spin-dependent scatterers with large scattering cross-sections in
+graphene -a Zeeman-like and an intrinsic spin-orbit coupling impurity- and show
+that a gated ring around them can be engineered to produce an effcient control
+of the spin dependent transport, like current spin polarization and spin Hall
+angle. Our analysis is based on a spin-dependent partial-waves expansion of the
+electronic wave-functions in the continuum approximation, described by the
+Dirac equation.",1605.02814v2
+2023-08-25,Enhanced Spin Hall Ratio in Two-Dimensional III-V Semiconductors,"Spin Hall effect plays a critical role in spintronics since it can convert
+charge current to spin current. Using state-of-the-art ab initio calculations
+including quadrupole and spin-orbit coupling, the charge and spin transports
+have been investigated in pristine and doped two-dimensional III-V
+semiconductors. Valence bands induce a strong scattering which limits charge
+conductivity in the hole-doped system, where spin Hall conductivity is enhanced
+by the spin-orbit splitting, yielding an ultrahigh spin Hall ratio
+$\xi\approx0.9$ in GaAs monolayer at room temperature.",2308.13692v1
+2021-05-06,Spin-photon coupling for atomic qubit devices in silicon,"Electrically addressing spin systems is predicted to be a key component in
+developing scalable semiconductor-based quantum processing architectures, to
+enable fast spin qubit manipulation and long-distance entanglement via
+microwave photons. However, single spins have no electric dipole, and therefore
+a spin-orbit mechanism must be integrated in the qubit design. Here, we propose
+to couple microwave photons to atomically precise donor spin qubit devices in
+silicon using the hyperfine interaction intrinsic to donor systems and an
+electrically-induced spin-orbit coupling. We characterise a one-electron system
+bound to a tunnel-coupled donor pair (1P-1P) using the tight-binding method,
+and then estimate the spin-photon coupling achievable under realistic
+assumptions. We address the recent experiments on double quantum dots (DQDs) in
+silicon and indicate the differences between DQD and 1P-1P systems. Our
+analysis shows that it is possible to achieve strong spin-photon coupling in
+1P-1P systems in realistic device conditions without the need for an external
+magnetic field gradient.",2105.02904v1
+2016-08-01,Spin-orbit coupled two-electron Fermi gases of ytterbium atoms,"We demonstrate all-optical implementation of spin-orbit coupling (SOC) in a
+two-electron Fermi gas of $^{173}$Yb atoms by coupling two hyperfine ground
+states with a narrow optical transition. Due to the SU($N$) symmetry of the
+$^1$S$_0$ ground-state manifold which is insensitive to external magnetic
+fields, an optical AC Stark effect is applied to split the ground spin states,
+which exhibits a high stability compared with experiments on alkali and
+lanthanide atoms, and separate out an effective spin-1/2 subspace from other
+hyperfine levels for the realization of SOC. The dephasing spin dynamics when a
+momentum-dependent spin-orbit gap being suddenly opened and the asymmetric
+momentum distribution of the spin-orbit coupled Fermi gas are observed as a
+hallmark of SOC. The realization of all-optical SOC for ytterbium fermions
+should offer a new route to a long-lived spin-orbit coupled Fermi gas and
+greatly expand our capability in studying novel spin-orbit physics with
+alkaline-earth-like atoms.",1608.00478v3
+2019-12-10,Ligand-field contributions to spin-phonon coupling in a family of Vanadium molecular qubits from multi-reference electronic structure theory,"Molecular electronic spins represent one of the most promising building
+blocks for the design of quantum computing architectures. However, the
+advancement of this technology requires the increase of spin lifetime at
+ambient temperature. Spin-phonon coupling has been recognized as the key
+interaction dictating spin relaxation at high temperature in molecular crystals
+and the search for chemical-design principles to control such interaction are a
+fundamental challenge in the field. Here we present a multi-reference
+first-principles analysis of the g-tensor and the spin-phonon coupling in a
+series of four exa-coordinate Vanadium(IV) molecular complexes, where the
+catecholate ligand donor atom is progressively changed from Oxygen to Sulphur,
+Selenium and Tellurium. A ligand field interpretation of the multi-reference
+electronic structure theory results made it possible to rationalize the
+correlation between the molecular g-shifts and the average spin-phonon coupling
+coefficients, revealing the role of spin-orbit coupling, chemical bond
+covalency and energy splitting of d-like orbitals in spin relaxation. Our study
+reveals the simultaneous increase of metal-ligand covalency and electronic
+excited state energy separation as key elements of an optimal strategy towards
+long spin-lattice lifetimes in molecular qubits.",1912.04545v1
+2006-04-13,"Spin photocurrent, its spectra dependence, and current-induced spin polarization in an InGaAs/InAlAs two-dimensional electron gas","Converse effect of spin photocurrent and current induced spin polarization
+are experimentally demonstrated in the same two-dimensional electron gas system
+with Rashba spin splitting. Their consistency with the strength of the Rashba
+coupling as measured from beating of the Shubnikov-de Haas oscillations reveals
+a unified picture for the spin photocurrent, current-induced spin polarization
+and spin orbit coupling. In addition, the observed spectral inversion of the
+spin photocurrent indicates the system with dominating structure inversion
+asymmetry.",0604331v1
+2007-11-21,Josephson Effect between Conventional and Rashba Superconductors,"We study the Josephson effect between a conventional s-wave superconductor
+and a non-centrosymmetric superconductor with Rashba spin-orbit coupling.
+Rashba spin-orbit coupling affects the Josephson pair tunneling in a
+characteristic way. The Josephson coupling can be decomposed into two parts, a
+`spin-singlet-like' and a `spin-triplet-like' component. The latter component
+can lead to shift of the Josephson phase by \pi relative to the former
+coupling. This has important implications on interference effects and may
+explain some recent experimental results for the Al/CePt3Si junction.",0711.3241v2
+2007-04-06,Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots,"We estimate the spin relaxation rate due to spin-orbit coupling and acoustic
+phonon scattering in weakly-confined quantum dots with up to five interacting
+electrons. The Full Configuration Interaction approach is used to account for
+the inter-electron repulsion, and Rashba and Dresselhaus spin-orbit couplings
+are exactly diagonalized. We show that electron-electron interaction strongly
+affects spin-orbit admixture in the sample. Consequently, relaxation rates
+strongly depend on the number of carriers confined in the dot. We identify the
+mechanisms which may lead to improved spin stability in few electron (>2)
+quantum dots as compared to the usual one and two electron devices. Finally, we
+discuss recent experiments on triplet-singlet transitions in GaAs dots subject
+to external magnetic fields. Our simulations are in good agreement with the
+experimental findings, and support the interpretation of the observed spin
+relaxation as being due to spin-orbit coupling assisted by acoustic phonon
+emission.",0704.0868v2
+2011-11-22,Spatial Analogue of Quantum Spin Dynamics via Spin-Orbit Interaction,"We map electron spin dynamics from time to space in quantum wires with
+spatially uniform and oscillating Rashba spin-orbit coupling. The presence of
+the spin-orbit interaction introduces pseudo-Zeeman couplings of the electron
+spins to effective magnetic fields. We show that by periodically modulating the
+spin-orbit coupling along the quantum wire axis, it is possible to create the
+spatial analogue of spin resonance, without the need for any real magnetic
+fields. The mapping of time-dependent operations onto a spatial axis suggests a
+new mode for quantum information processing in which gate operations are
+encoded into the band structure of the material. We describe a realization of
+such materials within nanowires at the interface of LaAlO3/SrTiO3
+heterostructures.",1111.5311v1
+2013-08-10,Spin Chaos Manifestation in a Driven Quantum Billiard with Spin-Orbit Coupling,"The coupling of orbital and spin degrees of freedom is the source of many
+interesting phenomena. Here, we study the electron dynamics in a quantum
+billiard --a mesoscopic rectangular quantum dot-- with spin-orbit coupling
+driven by a periodic electric field. We find that both the spatial and temporal
+profiles of the observables demonstrate the transition to chaotic dynamics with
+qualitative modifications of the power spectra and patterns of probability and
+spin density. The time dependence of the wavefunctions and spin density
+distributions indicates spin-charge separation {seen in the decay of the
+spin-charge density correlators}. This new spin chaos effect can be
+experimentally verified leading to a better understanding of the interplay
+between spin and spatial degrees of freedom, relevant to fundamental and
+applied quantum physics.",1308.2333v2
+2014-03-16,Anisotropic intrinsic spin Hall effect in quantum wires,"We use numerical simulations to investigate the spin Hall effect in quantum
+wires in the presence of both Rashba and Dresselhaus spin-orbit coupling. We
+find that the intrinsic spin Hall effect is highly anisotropic with respect to
+the orientation of the wire, and that the nature of this anisotropy depends
+strongly on the electron density and the relative strengths of the Rashba and
+Dresselhaus spin-orbit coupling. In particular, at low densities when only one
+subband of the quantum wire is occupied, the spin Hall effect is strongest for
+electron momentum along the $[\bar{1}10]$ axis, which is opposite than what is
+expected for the purely 2D case. In addition, when more than one subband is
+occupied, the strength and anisotropy of the spin Hall effect can vary greatly
+over relatively small changes in electron density, which makes it difficult to
+predict which wire orientation will maximize the strength of the spin Hall
+effect. These results help to illuminate the role of quantum confinement in
+spin-orbit-coupled systems, and can serve as a guide for future experimental
+work on the use of quantum wires for spin-Hall-based spintronic applications.",1403.3936v1
+2006-05-23,All-electrical control of single ion spins in a semiconductor,"We propose a method for all-electrical initialization, control and readout of
+the spin of single ions substituted into a semiconductor. Mn ions in GaAs form
+a natural example. In the ion's ground state the Mn core spin magnetic moment
+locks antiparallel to the spin and orbital magnetic moment of a bound valence
+hole from the GaAs host. Direct electrical manipulation of the ion spin is
+possible because electric fields manipulate the orbital wave function of the
+hole, and through the spin-orbit coupling the spin is reoriented as well.
+Coupling two or more ion spins can be achieved using electrical gates to
+control the size of the valence hole wave function near the semiconductor
+surface. This proposal for coherent manipulation of individual ionic spins and
+controlled coupling of ionic spins via electrical gates alone may find
+applications in extremely high density information storage and in scalable
+coherent or quantum information processing.",0605203v2
+2014-08-04,Spiral spin textures of bosonic Mott insulator with SU(3) spin-orbit coupling,"We study the Mott phase of three-component bosons, with one particle per
+site, in an optical lattice by mapping it onto an SU(3) spin model. In the
+simplest case of full SU(3) symmetry, one obtains a ferromagnetic Heisenberg
+model. Introducing an SU(3) analog of spin-orbit coupling, additional spin-spin
+interactions are generated. We first consider the scenario of spin-dependent
+hopping phases, leading to Dzyaloshinskii-Moriya-type interactions. They result
+in the formation of spiral spin textures, which in one dimension can be
+understood by a local unitary transformation. Applying classical Monte Carlo
+simulations, we extend our study to two-dimensional systems, and systems with
+""true"" spin-orbit coupling, involving spin-changing hoppings.",1408.0769v2
+2017-04-12,Spin Hall effect emerging from a chiral magnetic lattice without spin-orbit coupling,"The spin Hall effect (SHE), which converts a charge current into a transverse
+spin current, has long been believed to be a phenomenon induced by the
+spin--orbit coupling. Here, we propose an alternative mechanism to realize the
+intrinsic SHE through a chiral magnetic structure that breaks the spin rotation
+symmetry. No spin--orbit coupling is needed even when the scalar spin chirality
+vanishes, different from the case of the topological Hall effect. In known
+chiral antiferromagnetic compounds Mn$_3X$ ($X=$ Ga, Ge, and Sn), for example,
+we indeed obtain large spin Hall conductivities based on \textit{ab initio}
+calculations. Apart further developing the conceptual understanding of the SHE,
+our work suggests an alternative strategy to design spin Hall materials without
+involving heavy elements, which may be advantageous for technological
+applications.",1704.03917v2
+2024-03-15,Giant Spin Splitting and its Origin in Methylhydrazinium Lead Halide Perovskites,"Spin splitting, or removal of spin degeneracy in the electronic energy
+band/level is often a measure of spin-orbit coupling strength and a way to
+manipulate spin degrees of freedom. We use first-principles simulations to
+predict giant spin splitting in methylhydrazinium lead halide (MHyPbX$_3$, MHy
+= CH$_3$NH$_2$NH$_2$, X = Br and Cl) hybrid organic-inorganic perovskites. The
+values can reach up to 408.0~meV at zero Kelvin and 281.6~meV at room
+temperature. The origin of the effect is traced to the large distortion of
+PbX$_3$ framework, driven primarily by Pb ions in the ferroelectric
+$\Gamma^{3-}$ mode. The Pb displacements consist of combination of polar and
+antipolar arrangements and result in up to 39.2~meV/atom enhancement of the
+spin-orbit coupling energy in the polar phase of the materials. The spin-orbit
+coupling gives origin to highly persistent spin textures in MHyPbX$_3$, which
+are desirable for applications in spintronics and quantum computing. Our
+findings reveal an additional functionality for hybrid organic-inorganic
+perovskite and open a way for the design of more materials with giant spin
+splitting.",2403.10035v1
+2007-10-29,Cyclotron motion and magnetic focusing in semiconductor quantum wells with spin-orbit coupling,"We investigate the ballistic motion of electrons in III-V semiconductor
+quantum wells with Rashba spin-orbit coupling in a perpendicular magnetic
+field. Taking into account the full quantum dynamics of the problem, we explore
+the modifications of classical cyclotron orbits due to spin-orbit interaction.
+As a result, for electron energies comparable with the cyclotron energy the
+dynamics are particularly rich and not adequately described by semiclassical
+approximations. Our study is complementary to previous semiclassical approaches
+concentrating on the regime of weaker fields.",0710.5395v2
+2012-06-21,Momentum-resolved radio-frequency spectroscopy of ultracold atomic Fermi gases in a spin-orbit coupled lattice,"We investigate theoretically momentum-resolved radio-frequency (rf)
+spectroscopy of a noninteracting atomic Fermi gas in a spin-orbit coupled
+lattice. This lattice configuration has been recently created at MIT [Cheuk et
+al., arXiv:1205.3483] for 6Li atoms, by coupling the two hyperfine spin-states
+with a pair of Raman laser beams and additional rf coupling. Here, we show that
+momentum-resolved rf spectroscopy can measure single-particle energies and
+eigenstates and therefore resolve the band structure of the spin-orbit coupled
+lattice. In our calculations, we take into account the effects of temperatures
+and harmonic traps. Our predictions are to be confronted with future
+experiments on spin-orbit coupled Fermi gases of 40K atoms in a lattice
+potential.",1206.4778v1
+2018-09-04,Proximity-Induced Spin-Orbit Coupling in Graphene-Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$ Heterostructures,"The weak intrinsic spin-orbit coupling in graphene can be greatly enhanced by
+proximity coupling. Here we report on the proximity-induced spin-orbit coupling
+in graphene transferred by hexagonal boron nitride (hBN) onto the topological
+insulator Bi$_{1.5}$Sb$_{0.5}$Te$_{1.7}$Se$_{1.3}$ (BSTS) which was grown on a
+hBN substrate by vapor solid synthesis. Phase coherent transport measurements,
+revealing weak localization, allow us to extract the carrier density-dependent
+phase coherence length $l_\phi$. While $l_\phi$ increases with increasing
+carrier density in the hBN/graphene/hBN reference sample, it decreases in
+BSTS/graphene due to the proximity-coupling of BSTS to graphene. The latter
+behavior results from D'yakonov-Perel-type spin scattering in graphene with a
+large proximity-induced spin-orbit coupling strength of at least 2.5 meV.",1809.01113v2
+2021-12-11,Itinerant ferromagnetism of a dipolar Fermi gas with Raman-induced spin-orbit coupling,"We elucidate the itinerant ferromagnetism of a dipolar Fermi gas with a
+Raman-induced spin-orbit coupling by investigating the exotic phase diagrams at
+zero and finite temperature. It is revealed that the dipolar interaction along
+with spin-orbit coupling can corroborate the formation of ferromagnetism and
+the Raman coupling adversely eliminates the tendency to this ferromagnetism
+transition, which greatly transcends the general understanding of this subject
+with contact interaction only. We explore the ground states through the density
+and spin-flip distribution in momentum space, which exhibits novel degeneracy
+at strong Raman coupling indicated by a non-zero entropy at zero temperature.
+We calculate the transition temperatures well within the reach of an
+experimental system when altering the dipolar and spin-orbit coupling strength,
+which paves a way to the further experimental realization.",2112.05898v2
+2015-12-17,Multi-$Q$ hexagonal spin density waves and dynamically generated spin-orbit coupling: time-reversal invariant analog of the chiral spin density wave,"We study hexagonal spin-channel (""triplet"") density waves with commensurate
+$M$-point propagation vectors. We first show that the three $Q=M$ components of
+the singlet charge density and charge-current density waves can be mapped to
+multi-component $Q=0$ nonzero angular momentum order in three dimensions ($3D$)
+with cubic crystal symmetry. This one-to-one correspondence is exploited to
+define a symmetry classification for triplet $M$-point density waves using the
+standard classification of spin-orbit coupled electronic liquid crystal phases
+of a cubic crystal. Through this classification we naturally identify a set of
+non-coplanar spin density and spin-current density waves: the chiral spin
+density wave and its time-reversal invariant analog. These can be thought of as
+$3D$ $L=2$ and $L=4$ spin-orbit coupled isotropic $\beta$-phase orders. In
+contrast, uniaxial spin density waves are shown to correspond to
+$\alpha$-phases. The non-coplanar triple-$M$ spin-current density wave realizes
+a novel $2D$ semimetal state with three flavors of four-component spin-momentum
+locked Dirac cones, protected by a crystal symmetry akin to non-symmorphic
+symmetry, and sits at the boundary between a trivial and topological insulator.
+In addition, we point out that a special class of classical spin states,
+defined as classical spin states respecting all lattice symmetries up to global
+spin rotation, are naturally obtained from the symmetry classification of
+electronic triplet density waves. These symmetric classical spin states are the
+classical long-range ordered limits of chiral spin liquids.",1512.05673v3
+2021-07-01,Orbitally-selective Breakdown of the Fermi Liquid and Simultaneous Enhancement of Metallic and Insulating States in Correlated Multi-band Systems with Spin-orbit Coupling,"We show that spin-orbit coupling (SOC) plays Janus-faced roles on the
+orbitally-selective Mott transitions in a three-orbital Hubbard model with
+crystal field splitting at a specific filling of $2/3$, which is a minimal
+Hamiltonian for ruthenates. While the SOC favors metallic state due to
+enhancement of orbital hybridization at smaller on-site Coulomb repulsions, it
+stabilizes the Mott insulating state ascribed to lifting of orbital
+degeneracies and enhancement of band polarizations at larger electronic
+interaction. Moreover, an orbitally-selective non-Fermi liquid (OSnFL), where
+breakdown and retention of the Fermi liquid coexist in different orbitals,
+emerges between the orbitally-selective Mott phase and the Fermi-liquid state.
+This novel state can be used to account for the exotic metallic behavior
+observed in 4$d$ materials, such as Ca$_{1.8}$Sr$_{0.2}$RuO$_4$, Ba$_2$RuO$_4$
+under strain and Sr$_2$RuO$_4$ under uniaxial pressure. We propose that
+orbitally-selective Kondo breakdown may account for the OSnFL.",2107.00419v1
+2023-12-07,Resolving the Orbital Character of Low-energy Excitations in Mott Insulator with Intermediate Spin-orbit Coupling,"Multi-band Mott insulators with moderate spin-orbit and Hund's coupling are
+key reference points for theoretical concept developments of correlated
+electron systems. The ruthenate Mott insulator Ca$_{2}$RuO$_{4}$ has therefore
+been intensively studied by spectroscopic probes. However, it has been
+challenging to resolve the fundamental excitations emerging from the hierarchy
+of electronic energy scales. Here we apply state-of-the-art resonant inelastic
+x-ray scattering to probe deeper into the electronic excitations found in
+Ca$_{2}$RuO$_{4}$. In this fashion, we probe a series of spin-orbital
+excitations at low energies and resolve the level splitting of the
+intra-$t_{2g}$ structure due to spin-orbit coupling and crystal field
+splitting. Most importantly, the low-energy excitations exhibit strong orbital
+character. Such direct determination of relevant electronic energy scales is
+important, as it sharpens the target for theory developments of Mott
+insulators' orbital degree of freedom.",2312.04406v1
+2020-11-06,Acoustic spin Hall effect in strong spin-orbit metals,"We report on the observation of the acoustic spin Hall effect that
+facilitates lattice motion induced spin current via spin orbit interaction
+(SOI). Under excitation of surface acoustic wave (SAW), we find a spin current
+flows orthogonal to the propagation direction of a surface acoustic wave (SAW)
+in non-magnetic metals. The acoustic spin Hall effect manifests itself in a
+field-dependent acoustic voltage in non-magnetic metal (NM)/ferromagnetic metal
+(FM) bilayers. The acoustic voltage takes a maximum when the NM layer thickness
+is close to its spin diffusion length, vanishes for NM layers with weak SOI and
+increases linearly with the SAW frequency. To account for these results, we
+find the spin current must scale with the SOI and the time derivative of the
+lattice displacement. Such form of spin current can be derived from a Berry
+electric field associated with time varying Berry curvature and/or an
+unconventional spin-lattice interaction mediated by SOI. These results, which
+imply the strong coupling of electron spins with rotating lattices via the SOI,
+show the potential of lattice dynamics to supply spin current in strong spin
+orbit metals.",2011.03246v2
+2007-10-28,On the nature of steady states of spin distributions in the presence of spin-orbit interactions,"In the presence of spin-orbit interactions, the steady state established for
+spin distributions in an electric field is qualitatively different from the
+steady state for charge distributions. This is primarily because the steady
+state established for spin distributions involves spin precession due to
+spin-orbit coupling. We demonstrate in this work that the spin density matrix
+in an external electric field acquires two corrections with different
+dependencies on the characteristic momentum scattering time. One part is
+associated with conserved spins, diverges in the clean limit and is responsible
+for the establishment of a steady-state spin density in electric fields.
+Another part is associated with precessing spins, is finite in the clean limit
+and is responsible for the establishment of spin currents in electric fields.
+Scattering between these distributions has important consequences for spin
+dynamics and spin-related effects in general, and explains some recent puzzling
+observations, which are captured by our unified theory.",0710.5260v1
+2018-04-23,Microscopic linear response theory of spin relaxation and relativistic transport phenomena in graphene,"We present a unified theoretical framework for the study of spin dynamics and
+relativistic transport phenomena in disordered two-dimensional Dirac systems
+with pseudospin-spin coupling. The formalism is applied to the paradigmatic
+case of graphene with uniform Bychkov-Rashba interaction and shown to capture
+spin relaxation processes and associated charge-to-spin interconversion
+phenomena in response to generic external perturbations, including spin density
+fluctuations and electric fields. A controlled diagrammatic evaluation of the
+generalized spin susceptibility in the diffusive regime of weak spin-orbit
+interaction allows us to show that the spin and momentum lifetimes satisfy the
+standard Dyakonov-Perel relation for both weak (Gaussian) and resonant
+(unitary) nonmagnetic disorder. Finally, we demonstrate that the spin
+relaxation rate can be derived in the zero-frequency limit by exploiting the
+SU(2) covariant conservation laws for the spin observables. Our results set the
+stage for a fully quantum-mechanical description of spin relaxation in both
+pristine graphene samples with weak spin-orbit fields and in graphene
+heterostructures with enhanced spin-orbital effects currently attracting much
+attention.",1804.08634v2
+2019-04-08,Orbital Edelstein effect from density-wave order,"Coupling between charge and spin, and magnetoelectric effects more generally,
+have been an area of great interest for several years, with the sought-after
+ability to control magnetic degrees of freedom via charge currents serving as
+an impetus. The orbital Edelstein effect (OEE) is a kinetic magnetoelectric
+effect consisting of a bulk orbital magnetization induced by a charge current.
+It is the orbital analogue of the spin Edelstein effect in spin-orbit coupled
+materials, in which a charge current drives nonzero electron spin
+magnetization. The OEE has recently been investigated in the context of Weyl
+semimetals and Weyl metals. Motivated by these developments, we study a model
+of electrons without spin-orbit coupling which exhibits line nodes that get
+gapped out by via symmetry breaking due to an interaction-induced charge
+density wave order. This model is shown to exhibit a temperature dependent OEE,
+which appears due to symmetry reduction into a gyrotropic crystal class.",1904.04280v1
+2011-10-30,Chaotic spin-dependent electron dynamics in a field-driven double dot potential,"We study the nonlinear classical dynamics of an electron confined in a double
+dot potential and subjected to a spin-orbit coupling and a constant external
+magnetic field. It is shown that due to the spin orbit coupling, the energy can
+be transferred from the spin to the orbital motion. This naturally heats up the
+orbital motion which, due to the presence of the separatrix line in the phase
+space of the system, results in a motion of the electron between the dots. It
+is shown that depending on the strength of the spin orbit coupling and the
+energy of the system, the electronic orbital motion undergoes a transition from
+the regular to the chaotic regime.",1110.6597v1
+2018-02-23,Generation and detection of dissipationless spin current in MgO/Si bilayer,"Spintronics is an analogue to electronics where spin of the electron rather
+than its charge is functionally controlled for devices. The generation and
+detection of spin current without ferromagnetic or exotic/scarce materials are
+two the biggest challenges for spintronics devices. In this study, we report a
+solution to the two problems of spin current generation and detection in Si.
+Using non-local measurement, we experimentally demonstrate the generation of
+helical dissipationless spin current using spin-Hall effect. Contrary to the
+theoretical prediction, we observe the spin-Hall effect in both n-doped and
+p-doped Si. The helical spin current is attributed to the site-inversion
+asymmetry of the diamond cubic lattice of Si and structure inversion asymmetry
+in MgO/Si bilayer. The spin to charge conversion in Si is insignificant due to
+weak spin-orbit coupling. For the efficient detection of spin current, we
+report spin to charge conversion at the MgO (1nm)/Si (2 um) (p-doped and
+n-doped) thin film interface due to Rashba spin-orbit coupling. We detected the
+spin current at a distance of >100 um, which is an order of magnitude larger
+than the longest spin diffusion length measured using spin injection
+techniques. The existence of spin current in Si is verified from coercivity
+reduction in Co/Pd multilayer due to spin-orbit torque generated by spin
+current from Si.",1802.08627v1
+2016-07-20,Electron dynamics in graphene with spin-orbit couplings and periodic potentials,"We use both continuum and lattice models to study the energy-momentum
+dispersion and the dynamics of a wave packet for an electron moving in graphene
+in the presence of spin-orbit couplings and either a single potential barrier
+or a periodic array of potential barriers. Both Kane-Mele and Rashba spin-orbit
+couplings are considered. A number of special things occur when the Kane-Mele
+and Rashba couplings are equal in magnitude. In the absence of a potential, the
+dispersion then consists of both massless Dirac and massive Dirac states. A
+periodic potential is known to generate additional Dirac points; we show that
+spin-orbit couplings generally open gaps at all those points, but if the two
+spin-orbit couplings are equal, some of the Dirac points remain gapless. We
+show that the massless and massive states respond differently to a potential
+barrier; the massless states transmit perfectly through the barrier at normal
+incidence while the massive states reflect from it. In the presence of a single
+potential barrier, we show that there are states localized along the barrier.
+Finally, we study the time evolution of a wave packet in the presence of a
+periodic potential. We discover special points in momentum space where there is
+almost no spreading of a wave packet; there are six such points in graphene
+when the spin-orbit couplings are absent.",1607.05904v2
+2000-12-07,Stripes Induced by Orbital Ordering in Layered Manganites,"Spin-charge-orbital ordered structures in doped layered manganites are
+investigated using an orbital-degenerate double-exchange model tightly coupled
+to Jahn-Teller distortions. In the ferromagnetic phase, unexpected diagonal
+stripes at $x$=$1/m$ ($m$=integer) are observed, as in recent experiments.
+These stripes are induced by the orbital degree of freedom, which forms a
+staggered pattern in the background. A $\pi$-shift in the orbital order across
+stripes is identified, analogous to the $\pi$-shift in spin order across
+stripes in cuprates. At $x$=1/4 and 1/3, another non-magnetic phase with
+diagonal static charge stripes is stabilized at intermediate values of the
+$t_{\rm 2g}$-spins exchange coupling.",0012098v2
+2004-07-15,Lattice Dynamics in a strongly dimerized low-dimensional model with orbital ordering,"We study the interplay of spin, orbital and lattice degrees of freedom in a
+one-dimensional Kugel-Khomskii model coupled to phonons. In the vicinity of the
+dimer point we analyze the excitation spectrum, mapping the spin and orbital
+degrees of freedom to bond operators. In particular we study the
+renormalization of the phonon propagator due to coupling to the orbital and
+magnetic excitations. Considering both, ferro- and antiferro-orbital ordering
+we will show that the appearance of orbiton shake-up processes in the phonon
+spectrum is sensitive to the type of Jahn-Teller distortion. The relevance of
+our results for optical spectroscopy on low dimensional transition metal
+compounds will be discussed.",0407394v2
+2006-06-30,Quantum Spin Hall Effect and Enhanced Magnetic Response by Spin-Orbit Coupling,"We show that the spin Hall conductivity in insulators is related with a
+magnetic susceptibility representing the strength of the spin-orbit coupling.
+We use this relationship as a guiding principle to search real materials
+showing quantum spin Hall effect. As a result, we theoretically predict that
+bismuth will show the quantum spin Hall effect, both by calculating the helical
+edge states, and by showing the non-triviality of the Z_2 topological number,
+and propose possible experiments.",0607001v2
+2006-08-28,Inverse Spin Hall Effect by Spin Injection,"Motivated by a recent experiment[Nature {\bf 442}, 176 (2006)], we present a
+quantitative microscopic theory to investigate the inverse spin-Hall effect
+with spin injection into aluminum considering both intrinsic and extrinsic
+spin-orbit couplings using the orthogonalized-plane-wave method. Our
+theoretical results are in good agreement with the experimental data. It is
+also clear that the magnitude of the anomalous Hall resistivity is mainly due
+to contributions from extrinsic skew scattering, while its spatial variation is
+determined by the intrinsic spin-orbit coupling.",0608594v2
+2006-11-13,Anisotropic current-induced spin accumulation in the two-dimensional electron gas with spin-orbit coupling,"We investigate the magnetoelectric (or inverse spin-galvanic) effect in the
+two dimensional electron gases with both Rashba and Dresselhaus spin-orbit
+coupling using an exact solution of the Boltzmann equation for electron spin
+and momentum. The spin response to an in-plane electric field turns out to be
+highly anisotropic while the usual charge conductivity remains isotropic,
+contrary to earlier statements.",0611328v2
+2010-11-03,Direction Dependence of Spin Relaxation in Confined 2D Systems,"The dependence of spin relaxation on the direction of the quantum wire under
+Rashba and Dresselhaus (linear and cubic) spin orbit coupling is studied.
+Comprising the dimensional reduction of the wire in the diffusive regime, the
+lowest spin relaxation and dephasing rates for (001) and (110) systems are
+found. The analysis of spin relaxation reduction is then extended to
+non-diffusive wires where it is shown that, in contrast to the theory of
+dimensional crossover from weak localization to weak antilocalization in
+diffusive wires, the relaxation due to cubic Dresselhaus spin orbit coupling is
+reduced and the linear part shifted with the number of transverse channels.",1011.0850v1
+2017-09-01,Spin Hall mode in a trapped thermal Rashba gas,"We theoretically investigate a two-dimensional harmonically-trapped gas of
+identical atoms with Rashba spin-orbit coupling and no interatomic
+interactions. In analogy with the spin Hall effect in uniform space, the gas
+exhibits a spin Hall mode. In particular, in response to a displacement of the
+center-of-mass of the system, spin-dipole moment oscillations occur. We
+determine the properties of these oscillations exactly, and find that their
+amplitude strongly depends on the spin-orbit coupling strength and the quantum
+statistics of the particles.",1709.00426v1
+2007-05-29,Parametric spin excitations in lateral quantum dots,"In this work, the spin dynamics of a single electron under parametric
+modulation of a lateral quantum dot's electrostatic potential in the presence
+of spin-orbit coupling is investigated. Numerical and theoretical calculations
+demonstrate that, by squeezing and/or moving the electron's wave function, spin
+rotations with Rabi frequencies on the order of tens of megahertz can be
+achieved with experimentally accessible parameters in both parabolic and square
+lateral quantum dots. Applications of parametric excitations for determining
+spin-orbit coupling parameters and for increasing the spin polarization in the
+electronic ground are demonstrated.",0705.4231v2
+2010-03-29,Spontaneous persistent currents in magnetically ordered graphene ribbons,"We present a new mechanism for dissipationless persistent charge current. Two
+dimensional topological insulators hold dissipationless spin currents in their
+edges so that, for a given spin orientation, a net charge current flows which
+is exactly compensated by the counter-flow of the opposite spin. Here we show
+that ferromagnetic order in the edge upgrades the spin currents into persistent
+charge currents, without applied fields. For that matter, we study an
+interacting graphene zigzag ribbon with spin-orbit coupling. We find three
+electronic phases with magnetic edges that carry currents reaching 0.4nA,
+comparable to persistent currents in metallic rings, for the small spin orbit
+coupling in graphene. One of the phases is a valley half-metal.",1003.5692v1
+2010-04-07,Suppression of Spin Dephasing in a Two-Dimensional Electron Gas with a Quantum Point Contact,"Spin-orbit coupling is a source of strong spin dephasing in two- and
+three-dimensional semiconducting systems. We report that spin dephasing in a
+two-dimensional electron gas can be suppressed by introducing a quantum point
+contact. Surprisingly, this suppression was not limited to the vicinity of the
+contact but extended to the entire two-dimensional electron gas. This
+facilitates the electrical control of the spin degree of freedom in a
+two-dimensional electron gas through spin-orbit coupling.",1004.1006v2
+2010-06-24,Local spin polarization of Landau levels under Rashba spin-orbit coupling,"We investigate the local spin polarization texture of Landau levels under
+Rashba spin-orbit coupling in bulk two-dimensional electron gas (2DEG) systems.
+In order to analyze the spin polarization as a function of two-dimensional
+coordinates within the 2DEG, we first solve the system eigenstates in the
+symmetric gauge. Our exact analytical wavefunction solutions are shown to be
+gauge invariant with solutions obtained in the commonly used Landau gauge. We
+illustrate the two-dimensional spatial spin profile for a single Landau level
+and suggest means to measure and utilize the local polarization in practice.",1006.4679v1
+2016-09-02,"Room-temperature transport properties of spin-orbit coupled Fermi systems: Spin thermoelectric effects, phonon skew scattering","In this note we summarize our recent results for the temperature dependence
+of transport coefficients of metallic films in the presence of spin-orbit
+coupling. Our focus is on (i) the spin Nernst and the thermal Edelstein
+effects, and (ii) the phonon skew scattering contribution to the spin Hall
+conductivity, which is relevant for the temperature dependence of the spin Hall
+angle. Depending on the parameters, the latter is expected to show a
+non-monotonous behavior.",1609.00561v1
+2020-04-26,Spin soliton of Holstein model with spin-orbit coupling in one-dimensional conjugated polymers,"For Holstein model with Rashba spin-orbit coupling (SOC) we establish the
+nonlinear Schr\""odinger equations and obtain exact soliton solution
+analytically. It is found that the soliton is spin polarized determined both by
+the SOC and the electron-phonon (e-ph) interaction. The soliton can be used to
+describe the spin transport or spin current in organic semiconductors.",2004.12278v1
+2001-12-01,"Coulomb ""blockade"" of Nuclear Spin Relaxation in Quantum Dots","We study the mechanism of nuclear spin relaxation in quantum dots due to the
+electron exchange with 2D gas. We show that the nuclear spin relaxation rate is
+dramatically affected by the Coulomb blockade and can be controlled by gate
+voltage. In the case of strong spin-orbit coupling the relaxation rate is
+maximal in the Coulomb blockade valleys whereas for the weak spin-orbit
+coupling the maximum of the nuclear spin relaxation rate is near the Coulomb
+blockade peaks.",0112013v3
+2004-06-04,Competition between Spin-Orbit Interaction and Zeeman Coupling in Rashba 2DEGs,"We investigate systematically how the interplay between Rashba spin-orbit
+interaction and Zeeman coupling affects the electron transport and the spin
+dynamics in InGaAs-based 2D electron gases. From the quantitative analysis of
+the magnetoconductance, measured in the presence of an in-plane magnetic field,
+we conclude that this interplay results in a spin-induced breaking of time
+reversal symmetry and in an enhancement of the spin relaxation time. Both
+effects, due to a partial alignment of the electron spin along the applied
+magnetic field, are found to be in excellent agreement with recent theoretical
+predictions.",0406106v1
+2005-12-15,On the conservation of spin currents in spin-orbit coupled systems,"Applying the Gordon-decomposition-like technique, the convective spin current
+(CSC) is extracted from the total angular-momentum current. The CSC describes
+the transport properties of the electron spin and is conserved in the
+relativistic quantum mechanics approach where the spin-orbit coupling has been
+intrinsically taken into account. Arrestingly, in the presence of external
+electromagnetic field, the component of the convective spin along the field
+remain still conserved. This conserved CSC is also derived for the first time
+in the nonrelativistic limit using the Foldy-Wouthuysen transformation.",0512345v1
+2007-12-21,Tailoring hole spin splitting and polarization in nanowires,"Spin splitting in p-type semiconductor nanowires is strongly affected by the
+interplay between quantum confinement and spin-orbit coupling in the valence
+band. The latter's particular importance is revealed in our systematic
+theoretical study presented here, which has mapped the range of spin-orbit
+coupling strengths realized in typical semiconductors. Large controllable
+variations of the g-factor with associated characteristic spin polarization are
+shown to exist for nanowire subband edges, which therefore turn out to be a
+versatile laboratory for investigating the complex spin properties exhibited by
+quantum-confined holes.",0712.3624v1
+2008-01-27,Spin dynamics of two-dimensional electrons with Rashba spin-orbit coupling and electron-electron interactions,"We study the spin dynamics of two dimensional electron gases (2DEGs) with
+Rashba spin-orbit coupling by taking account of electron-electron interactions.
+The diffusion equations for charge and spin densities are derived by making use
+of the path-integral approach and the quasiclassical Green's function.
+Analyzing the effect of the interactions, we show that the spin-relaxation time
+can be enhanced by the electron-electron interaction in the ballistic regime.",0801.4132v2
+2009-02-22,"Graphene with Structure-Induced Spin-Orbit Coupling: Spin-Polarized States, Spin Zero Modes, and Quantum Hall Effect","Spin splitting of the energy spectrum of single-layer graphene on Au/Ni(111)
+substrate has been recently reported. I show that eigenstates of spin-orbit
+coupled graphene are polarized in-plane and perpendicular to electron momentum
+$\bf k$; the magnitude of spin polarization $\bf S$ vanishes when $k \to 0$. In
+a perpendicular magnetic field $\bf B$, $\bf S$ is parallel to $\bf B$, and two
+zero modes emerge in the Landau level spectrum. Singular $\bf B$-dependence of
+their magnetization suggests existence of a novel magnetic instability. They
+also manifest themselves in a new unconventional quantum Hall effect.",0902.3806v1
+2014-01-18,Spin injection via (110)-grown semiconductor barriers,"We study the tunneling of conduction electrons through a (110)-oriented
+single-barrier heterostructure grown from III-V semiconductor compounds. It is
+shown that, due to low spatial symmetry of such a barrier, the tunneling
+current through the barrier leads to an electron spin polarization. The inverse
+effect, generation of a direct tunneling current by spin polarized electrons,
+is also predicted. We develop the microscopic theory of the effects and show
+that the spin polarization emerges due to the combined action of the
+Dresselhaus spin-orbit coupling within the barrier and the Rashba spin-orbit
+coupling at the barrier interfaces.",1401.4526v1
+2014-12-15,Characterization of S-T$_+$ Transition Dynamics via Correlation Measurements,"Nuclear spins are an important source of dephasing for electron spin qubits
+in GaAs quantum dots. Most studies of their dynamics have focused on the
+relatively slow longitudinal polarization. We show, based on a semiclassical
+model and experimentally, that the dynamics of the transverse hyperfine field
+can be probed by correlating individual Landau-Zener sweeps across the S-T$_+$
+transition of a two-electron spin qubit. The relative Larmor precession of
+different nuclear spin species leads to oscillations in these correlations,
+whose decay arises from dephasing of the nuclei. In the presence of spin orbit
+coupling, oscillations with the absolute Larmor frequencies whose amplitude
+reflects the spin orbit coupling strength are expected.",1412.4551v1
+2022-05-24,Electron spin orientation dependence on momentum in pseudo gap phase of Bi2212,"The aim of the paper is to study the electron spin direction dependence on
+momentum due to the presence of Rashba spin-orbit coupling in the pseudo-gap
+phase of Bi2212 bilayer. The non-trivial spin texture in k-space is found
+tuneable by electric field. The dependence is reported earlier by a group of
+workers in a spin- and angle-resolved photoemission spectroscopic measurement.
+The synthetic spin-orbit coupling, characterized by the broken time-reversal
+symmetry, is expected to be useful for the manipulation of the spin
+orientation.",2205.11975v1
+2020-02-05,Microscopic Origin of Spin-Orbit Torque in Ferromagnetic Heterostructures: A First Principles Approach,"We present an {\it ab initio}-based theoretical framework which elucidates
+the origin of the spin-orbit torque (SOT) in Normal-Metal(NM)/Ferromagnet(FM)
+heterostructures. The SOT is decomposed into two contributions, namely, {\it
+spin-Hall} and the {\it spin-orbital} components. We find that {\it (i)} the
+Field-Like (FL) SOT is dominated by the spin-orbital component and {\it (ii)}
+both components contribute to the damping-like torque with comparable magnitude
+in the limit of thick Pt film. The contribution of the spin-orbital component
+to the DL-SOT is present only for NMs with strong SOC coupling strength. We
+demonstrate that the FL-SOT can be expressed in terms of the non-equilibrium
+spin-resolved orbital moment accumulation. The calculations reveal that the
+experimentally reported oxygen-induced sign-reversal of the FL-SOT in Pt/Co
+bilayers is due to the significant reduction of the majority-spin orbital
+moment accumulation on the interfacial NM atoms.",2002.01983v1
+2019-02-08,Spin dynamics of a millisecond pulsar orbiting closely around a massive black hole,"We investigate the spin dynamics of a millisecond pulsar (MSP) in a tightly
+bounded orbit around a massive black hole. These binaries are progenitors of
+the extreme-mass-ratio-inspirals (EMRIs) and intermediate-mass-ratio-inspirals
+(IMRIs) gravitational wave events. The Mathisson-Papapetrou-Dixon (MPD)
+formulation is used to determine the orbital motion and spin modulation and
+evolution. We show that the MSP will not be confined in a planar Keplerian
+orbit and its spin will exhibit precession and nutation induced by spin-orbit
+coupling and spin-curvature interaction. These spin and orbital behaviours will
+manifest observationally in the temporal variations in the MSP's pulsed
+emission and, with certain geometries, in the self-occultation of the pulsar's
+emitting poles. Radio pulsar timing observations will be able to detect such
+signatures. These extreme-mass-ratio binaries (EMRBs) and
+intermediate-mass-ratio binaries (IMRBs) are also strong gravitational wave
+sources. Combining radio pulsar timing and gravitational wave observations will
+allow us to determine the dynamics of these systems in high precision and hence
+the subtle behaviours of spinning masses in strong gravity.",1902.03146v1
+2022-11-07,Determining Perpendicular Magnetic Anisotropy in Fe/MgO/Fe Magnetic Tunnel Junction: A DFT-Based Spin-Orbit Torque Method,"In our JunPy package, we have combined the first-principles calculated
+self-consistent Hamiltonian with divide-and-conquer technique to successfully
+determine the magnetic anisotropy (MA) in an Fe/MgO/Fe magnetic tunnel junction
+(MTJ). We propose a comprehensive analytical derivation to clarify the crucial
+roles of spin-orbit coupling that mediates the exchange and spin-orbit
+components of spin torque, and the kinetic and spin-orbit components of spin
+current accumulation. The angular dependence of cumulative spin-orbit torque
+(SOT) indicates a uniaxial MA corresponding to the out-of-plane rotations of
+magnetic moments of the free Fe layers. Different from the conventional MA
+energy calculation and the phenomenological theory for a whole MTJ, our results
+provide insight into the orbital-resolved SOT for atomistic spin dynamics
+simulation in emergency complex magnetic heterojunctions.",2211.03603v3
+2017-04-20,Dynamics of a j=3/2 quantum spin liquid,"We study a spin-orbital model for 4$d^{1}$ or 5$d^{1}$ Mott insulators in
+ordered double perovskites with strong spin-orbit coupling. This model is
+conveniently written in terms of pseudospin and pseudo-orbital operators
+representing multipoles of the effective $j=3/2$ angular momentum. Similarities
+between this model and the effective theories of Kitaev materials motivate the
+proposal of a chiral spin-orbital liquid with Majorana fermion excitations. The
+thermodynamic and spectroscopic properties of this quantum spin liquid are
+characterized using parton mean-field theory. The heat capacity, spin-lattice
+relaxation rate, and dynamic structure factor for inelastic neutron scattering
+are calculated and compared with the experimental data for the spin liquid
+candidate Ba$_{2}$YMoO$_{6}$. Moreover, based on a symmetry analysis, we
+discuss the operators involved in resonant inelastic X-ray scattering (RIXS)
+amplitudes for double perovskite compounds. In general, the RIXS cross sections
+allow one to selectively probe pseudospin and pseudo-orbital degrees of
+freedom. For the chiral spin-orbital liquid in particular, these cross sections
+provide information about the spectrum for different flavors of Majorana
+fermions.",1704.06134v3
+2010-09-23,Time dependent configuration interaction simulations of spin swap in spin orbit coupled double quantum dots,"We perform time-dependent simulations of spin exchange for an electron pair
+in laterally coupled quantum dots. The calculation is based on configuration
+interaction scheme accounting for spin-orbit (SO) coupling and
+electron-electron interaction in a numerically exact way. Noninteracting
+electrons exchange orientations of their spins in a manner that can be
+understood by interdot tunneling associated with spin precession in an
+effective SO magnetic field that results in anisotropy of the spin swap. The
+Coulomb interaction blocks the electron transfer between the dots but the spin
+transfer and spin precession due to SO coupling is still observed. The
+electron-electron interaction additionally induces an appearance of spin
+components in the direction of the effective SO magnetic field which are
+opposite in both dots. Simulations indicate that the isotropy of the spin swap
+is restored for equal Dresselhaus and Rashba constants and properly oriented
+dots.",1009.4562v1
+2003-12-11,Orbital and spin contributions to the $g$-tensors in metal nanoparticles,"We present a theoretical study of the mesoscopic fluctuations of $g$-tensors
+in a metal nanoparticle. The calculations were performed using a semi-realistic
+tight-binding model, which contains both spin and orbital contributions to the
+$g$-tensors. The results depend on the product of the spin-orbit scattering
+time $\tau_{\textrm{\small so}}$ and the mean-level spacing $\delta$, but are
+otherwise weakly affected by the specific shape of a {\it generic}
+nanoparticle. We find that the spin contribution to the $g$-tensors agrees with
+Random Matrix Theory (RMT) predictions. On the other hand, in the strong
+spin-orbit coupling limit $\delta \tau_{\textrm{\small so}}/\hbar \to 0$, the
+orbital contribution depends crucially on the space character of the
+quasi-particle wavefunctions: it levels off at a small value for states of $d$
+character but is strongly enhanced for states of $sp$ character. Our numerical
+results demonstrate that when orbital coupling to the field is included, RMT
+predictions overestimate the typical $g$-factor of orbitals that have dominant
+$d$-character. This finding points to a possible source of the puzzling
+discrepancy between theory and experiment.",0312278v1
+2016-01-26,Jahn-Teller effect in systems with strong on-site spin-orbit coupling,"When strong spin-orbit coupling removes orbital degeneracy, it would at the
+same time appear to render the Jahn-Teller mechanism ineffective. We discuss
+such a situation, the t_2g manifold of iridates, and show that, while the
+Jahn-Teller effect does indeed not affect the j_eff=1/2 antiferromagnetically
+ordered ground state, it leads to distinctive signatures in the j_eff=3/2
+spin-orbit exciton. It allows for a hopping of the spin-orbit exciton between
+the nearest neighbor sites without producing defects in the j_eff=1/2
+antiferromagnet. This arises because the lattice-driven Jahn-Teller mechanism
+only couples to the orbital degree of freedom, but is not sensitive to the
+phase of the wave function that defines isospin j_z. This contrasts sharply
+with purely electronic propagation, which conserves isospin, and presence of
+Jahn-Teller coupling can explain some of the peculiar features of measured
+resonant inelastic x-ray scattering spectra of Sr_2IrO_4.",1601.07069v1
+2017-02-14,Spin-relaxation time in materials with broken inversion symmetry and large spin-orbit coupling,"We study the spin-relaxation time in materials where a large spin-orbit
+coupling (SOC) is present which breaks the spatial inversion symmetry. Such a
+spin-orbit coupling is realized in zincblende structures and heterostructures
+with a transversal electric field and the spin relaxation is usually described
+by the so-called D'yakonov-Perel' (DP) mechanism. We combine a Monte Carlo
+method and diagrammatic calculation based approaches in our study; the former
+tracks the time evolution of electron spins in a quasiparticle dynamics
+simulation in the presence of the built-in spin-orbit magnetic fields and the
+latter builds on the spin-diffusion propagator by Burkov and Balents [Burkov
+and Balents Phys. Rev. B. 69, 245312 (2004).]. Remarkably, we find a parameter
+free quantitative agreement between the two approaches and it also returns the
+conventional result of the DP mechanism in the appropriate limit. We discuss
+the full phase space of spin relaxation as a function of SOC strength, its
+distribution, and the magnitude of the momentum relaxation rate. This allows us
+to identify two novel spin-relaxation regimes; where spin relaxation is
+strongly non-exponential and the spin relaxation equals the momentum
+relaxation. A compelling analogy between the spin-relaxation theory and the NMR
+motional narrowing is highlighted.",1702.04162v1
+2017-12-30,Spin driven emergent antiferromagnetism and metal insulator transition in nanoscale p-Si,"The entanglement of the charge, spin and orbital degrees of freedom can give
+rise to emergent behavior especially in thin films, surfaces and interfaces.
+Often, materials that exhibit those properties require large spin orbit
+coupling. We hypothesize that the emergent behavior can also occur due to spin,
+electron and phonon interactions in widely studied simple materials such as Si.
+That is, large intrinsic spin-orbit coupling is not an essential requirement
+for emergent behavior. The central hypothesis is that when one of the specimen
+dimensions is of the same order (or smaller) as the spin diffusion length, then
+non-equilibrium spin accumulation due to spin injection or spin-Hall effect
+(SHE) will lead to emergent phase transformations in the non-ferromagnetic
+semiconductors. In this experimental work, we report spin mediated emergent
+antiferromagnetism and metal insulator transition in a Pd (1 nm)/Ni81Fe19 (25
+nm)/MgO (1 nm)/p-Si (~400 nm) thin film specimen. The spin-Hall effect in p-Si,
+observed through Rashba spin-orbit coupling mediated spin-Hall
+magnetoresistance behavior, is proposed to cause the spin accumulation and
+resulting emergent behavior. The phase transition is discovered from the
+diverging behavior in longitudinal third harmonic voltage, which is related to
+the thermal conductivity and heat capacity.",1801.00071v1
+2017-10-20,Spin relaxation of a donor electron coupled to interface states,"An electron spin qubit in a silicon donor atom is a promising candidate for
+quantum information processing because of its long coherence time. To be sensed
+with a single-electron transistor, the donor atom is usually located near an
+interface, where the donor states can be coupled with interface states. Here we
+study the phonon-assisted spin-relaxation mechanisms when a donor is coupled to
+confined (quantum-dot-like) interface states. We find that both Zeeman
+interaction and spin-orbit interaction can hybridize spin and orbital states,
+each contributing to phonon-assisted spin relaxation in addition to the spin
+relaxation for a bulk donor or a quantum dot. When the applied magnetic field
+$B$ is weak (compared to orbital spacing), the phonon assisted spin relaxation
+shows the $B^5$ dependence. We find that there are peaks (hot-spots) in the
+$B$-dependent and detuning dependent spin relaxation due to strong
+hybridization of orbital states with opposite spin. We also find spin
+relaxation dips (cool-spots) due to the interference of different relaxation
+channels. Qubit operations near spin relaxation hot-spots can be useful for the
+fast spin initialization and near cool-spots for the preservation of quantum
+information during the transfer of spin qubits.",1710.07674v2
+2007-06-17,Frequency dependence of induced spin polarization and spin current in quantum wells,"Dynamic response of two-dimensional electron systems with spin-orbit
+interaction is studied theoretically on the basis of quantum kinetic equation,
+taking into account elastic scattering of electrons. The spin polarization and
+spin current induced by the applied electric field are calculated for the whole
+class of electron systems described by p-linear spin-orbit Hamiltonians. The
+absence of nonequilibrium intrinsic static spin currents is confirmed for these
+systems with arbitrary (nonparabolic) electron energy spectrum. Relations
+between the spin polarization, spin current, and electric current are
+established. The general results are applied to the quantum wells grown in
+[001] and [110] crystallographic directions, with both Rashba and Dresselhaus
+types of spin-orbit coupling. It is shown that the existence of the fixed
+(momentum-independent) precession axes in [001]-grown wells with equal Rashba
+and Dresselhaus spin velocities or in symmetric [110]-grown wells leads to
+vanishing spin polarizability at arbitrary frequency of the applied electric
+field. This property is explained by the absence of Dyakonov-Perel-Kachorovskii
+spin relaxation for the spins polarized along these precession axes. As a
+result, a considerable frequency dispersion of spin polarization at very low
+frequency in the vicinity of the fixed precession axes is predicted. Possible
+effects of extrinsic spin-orbit coupling on the obtained results are discussed.",0706.2463v1
+2023-07-21,Symmetry analysis with spin crystallographic groups: Disentangling effects free of spin-orbit coupling in emergent electromagnetism,"Recent studies identified spin-order-driven phenomena such as spin-charge
+interconversion without relying on the relativistic spin-orbit interaction.
+Those physical properties can be prominent in systems containing light magnetic
+atoms due to sizable exchange splitting and may pave the way for realization of
+giant responses correlated with the spin degree of freedom. In this paper, we
+present a systematic symmetry analysis based on the spin crystallographic
+groups and identify the physical property of a vast number of magnetic
+materials up to 1500 in total. By decoupling the spin and orbital degrees of
+freedom, our analysis enables us to take a closer look into the relation
+between the dimensionality of spin structures and the resultant physical
+properties and to identify the spin and orbital contributions separately. In
+stark contrast to the established analysis with magnetic space groups, the spin
+crystallographic group manifests richer symmetry including spin-translation
+symmetry and leads to emergent responses. For representative examples, we
+discuss the geometrical nature of the anomalous Hall effect and magnetoelectric
+effect and classify the spin Hall effect arising from the nonrelativistic
+spin-charge coupling. Using the power of computational analysis, we apply our
+symmetry analysis to a wide range of magnets, encompassing complex magnets such
+as those with noncoplanar spin structures as well as collinear and coplanar
+magnets. We identify emergent multipoles relevant to physical responses and
+argue that our method provides a systematic tool for exploring sizable
+electromagnetic responses driven by spin order.",2307.11560v2
+2000-11-04,Orbital polarons and ferromagnetic insulators in manganites,"We argue that in lightly hole doped perovskite-type Mn oxides the holes
+(Mn$^{4+}$ sites) are surrounded by nearest neighbor Mn$^{3+}$ sites in which
+the occupied $3d$ orbitals have their lobes directed towards the central hole
+(Mn$^{4+}$) site and with spins coupled ferromagnetically to the central spin.
+This composite object, which can be viewed as a combined orbital-spin-lattice
+polaron, is accompanied by the breathing type (Mn$^{4+}$) and Jahn-Teller type
+(Mn$^{3+}$) local lattice distortions. We present calculations which indicate
+that for certain doping levels these orbital polarons may crystallize into a
+charge and orbitally ordered ferromagnetic insulating state.",0011070v1
+2013-06-08,Effect of Spin-Orbit Interaction on (4d)^3- and (5d)^3 -Based Transition-Metal Oxides,"The effects of a spin-orbit interaction on transition-metal ions of (4d)^3-
+and (5d)^3 -based oxides in which three electrons occupy t_{2g} orbitals are
+studied. The amplitude of the magnetic moment of d electrons on the 5d and 4d
+orbitals is estimated by numerical diagonalization. It is found that the
+magnetic moment is reduced by the spin-orbit interaction. It is suggested that
+(4d)^3- and (5d)^3 -based oxides are located in the middle of the L-S and J-J
+coupling schemes.",1306.1880v1
+2024-02-03,Gravitational losses for the binary systems induced by the next-to-leading spin-orbit coupling effects,"The orbital energy and momentum of the compact binary systems will loss due
+to gravitational radiation. Based on the mass and mass-current multipole
+moments of the binary system with the spin vector defined by Boh\'{e} et al.
+[Class. Quantum Grav. 30, 075017 (2013)], we calculate the loss rates of
+energy, angular and linear momentum induced by the next-to-leading spin-orbit
+effects. For the case of circular orbit, the formulations for these losses are
+given in terms of the orbital frequency.",2402.02170v1
+2021-08-23,Hydrodynamic theory of vorticity-induced spin transport,"Electron spin transport in a disordered metal is theoretically studied from
+the hydrodynamic viewpoint focusing on the role of electron vorticity. The
+spin-resolved momentum flux density of electrons is calculated taking account
+of the spin-orbit interaction and uniform magnetization, and the expression for
+the spin motive force is obtained as the linear response to a driving electric
+field. It is shown that the spin-resolved momentum flux density and motive
+force are characterized by troidal moments expressed as vector products of the
+applied external electric field and the spin polarization and/or magnetization.
+The spin-vorticity and magnetization-vorticity couplings studied recently are
+shown to arise from the toridal moments contribution to the momentum flux
+density. Spin motive force turns out to have a nonconservative contribution
+besides the conventional conservative one due to the spin-vorticity coupling.
+Spin accumulation induced by an electric field is calculated to demonstrate the
+direct relation between vorticity and induced spin, and the spin Hall effect is
+interpreted as due to the spin-vorticity coupling. The spin-vorticity coupling
+is shown to give rise to a vorticity-induced torque and a spin relaxation. The
+vorticity-induced torque is a linear effect of the spin-orbit interaction and
+is expected to be larger than the second-order torques such as nonadiabatic
+($\beta$) current-induced torque due to magnetization structure. The intrinsic
+inverse spin Hall effect is argued to correspond to the antisymmetric
+components of the momentum flux density in the hydrodynamic context.",2108.09919v1
+2020-04-20,Current-induced torque originating from orbital current,"The electrical manipulation of magnetization by current-induced spin torques
+has given access to realize a plethora of ultralow power and fast spintronic
+devices such as non-volatile magnetic memories, spin-torque nano-oscillators,
+and neuromorphic computing devices. Recent advances have led to the notion that
+relativistic spin-orbit coupling is an efficient source for current-induced
+torques, opening the field of spin-orbitronics. Despite the significant
+progress, however, the fundamental mechanism of magnetization manipulation, the
+requirement of spin currents in generating current-induced torques, has
+remained unchanged. Here, we demonstrate the generation of current-induced
+torques without the use of spin currents. By measuring the current-induced
+torque for naturally-oxidized-Cu/ferromagnetic-metal bilayers, we observed an
+exceptionally high effective spin Hall conductivity at low temperatures despite
+the absence of strong spin-orbit coupling. Furthermore, we found that the
+direction of the torque depends on the choice of the ferromagnetic layer, which
+counters the conventional understanding of the current-induced torque. These
+unconventional features are best interpreted in terms of an orbital counterpart
+of the spin torque, an orbital torque, which arises from the orbital Rashba
+effect and orbital current. These findings will shed light on the underlying
+physics of current-induced magnetization manipulation, potentially altering the
+landscape of spin-orbitronics.",2004.09165v1
+2003-12-30,A universal Hamiltonian for a quantum dot in the presence of spin-orbit interaction,"We derive a universal Hamiltonian for a quantum dot in the presence of
+spin-orbit interaction in the symmetry limits of a strong spin-dependent
+Aharonov-Bohm-like term. We also derive a closed expression for the conductance
+through such a dot, and use it to study the effects of spin-orbit on the
+conductance peak statistics in the presence of an exchange interaction. For a
+realistic strength of the exchange interaction, we find that the width of the
+peak-spacing distribution is sensitive to spin-orbit coupling only in the
+absence of an orbital magnetic field. We also find that spin-orbit coupling
+modifies the shape of the peak-spacing distribution and suppresses the
+peak-height fluctuations.",0312691v1
+2012-09-23,Strength of reduced two-body spin-orbit interaction from chiral three-nucleon force,"The contribution of a chiral three-nucleon force to the strength of an
+effective spin-orbit coupling is estimated. We first construct a reduced
+two-body interaction by folding one-nucleon degrees of freedom of the
+three-nucleon force in nuclear matter. The spin-orbit strength is evaluated by
+a Scheerbaum factor obtained by the $G$-matrix calculation in nuclear matter
+with the two-nucleon interaction plus the reduced two-nucleon interaction. The
+problem of the insufficiency of modern realistic two-nucleon interactions to
+account for the empirical spin-orbit strength is resolved. It is also indicated
+that the spin-orbit coupling is weaker in the neutron-rich environment. Because
+the spin-orbit component from the three-nucleon force is determined by the
+low-energy constants fixed in the two-nucleon sector, there is little
+uncertainty in the present estimation.",1209.5048v1
+2016-01-04,Optical conductivity of a 2DEG with anisotropic Rashba interaction at the interface of LaAlO$_3$/SrTiO$_3$,"We study optical conductivity of a two-dimensional electron gas with
+anisotropic $k$-cubic Rashba spin-orbit interaction formed at the
+LaAlO$_3$/SrTiO$_3$ interface. The anisotropic spin splitting energy gives rise
+to different features of the optical conductivity in comparison to the
+isotropic $k$-cubic Rashba spin-orbit interaction. For large carrier density
+and strong spin-orbit couplings, the density dependence of Drude weight
+deviates from the linear behavior. The charge and optical conductivities remain
+isotropic despite anisotropic nature of the Fermi contours. An infinitesimally
+small photon energy would suffice to initiate inter-band optical transitions
+due to degeneracy along certain directions in momentum space. The optical
+conductivity shows a single peak at a given photon energy depending on the
+system parameters and then falls off to zero at higher photon energy. These
+features are lacking for systems with isotropic $k$-cubic Rashba spin-orbit
+coupling. These striking features can be used to extract the information about
+nature of the spin-orbit interaction experimentally and illuminate some light
+on the orbital origin of the two-dimensional electron gas.",1601.00591v2
+2020-11-02,Intrinsic Mechanism for Magneto-Thermal Conductivity Oscillations in Spin-Orbit-Coupled Nodal Superconductors,"We describe a mechanism by which the longitudinal thermal conductivity
+$\kappa_{xx}$, measured in an in-plane magnetic field, oscillates as a function
+of field angle in layered nodal superconductors. These oscillations occur when
+the spin-orbit splitting at the nodes is larger than the nodal scattering rate,
+and are complementary to vortex-induced oscillations identified previously. In
+sufficiently anisotropic materials, the spin-orbit mechanism may be dominant.
+As a particular application, we focus on the cuprate high-temperature
+superconductor YBa$_2$Cu$_3$O$_{6+x}$. This material belongs to the class of
+Rashba bilayers, in which individual CuO$_2$ layers lack inversion symmetry
+although the crystal itself is globally centrosymmetric. We show that
+spin-orbit coupling endows $\kappa_{xx}/T$ with a characteristic dependence on
+magnetic field angle that should be easily detected experimentally, and argue
+that for underdoped samples the spin-orbit contribution is larger than the
+vortex contribution. A key advantage of the magneto-thermal conductivity is
+that it is a bulk probe of spin-orbit physics, and therefore not sensitive to
+inversion breaking at surfaces.",2011.01074v1
+2022-02-15,Spin orbital reorientation transitions induced by magnetic field,"Here we report on a new effect similar to the spin reorientation transition
+(SRT) that takes place at two magnetic fields of $B_{SORT1}$ and $B_{SORT2}$.
+The effect is observed in the magnetization curves of small Mn$^{3+}$ magnetic
+clusters in the wurtzite GaN (being in a paramagnetic state) calculated using
+crystal field model approach. The obtained results suggest that the computed
+magnetic anisotropy (MA) reverses its sign on increasing $B$ across $B_{SORT}$.
+Detailed analysis show however that MA is unchanged for high magnetic fields.
+We show that the observed effect arises from the interplay of the crystalline
+environment and the spin-orbit coupling $\lambda \hat{\textbf{S}}
+\hat{\textbf{L}}$, therefore we name it spin orbital reorientation transition
+(SORT). The value of $B_{SORT1}$ depends on the crystal field model parameters
+and the number of ions $N$ in a given cluster, whereas $B_{SORT2}$ is
+controlled mostly by the magnitude of the spin-orbit coupling $\lambda$. The
+explanation of SORT is given in terms of the spin $M_S$ and orbital momentum
+$M_L$ contributions to the total magnetization $M = M_S + M_L$. The similar
+effect should also be present in other materials with not completely quenched
+(non zero) orbital angular momentum $L$, a uniaxial magnetic anisotropy and the
+positive value of $\lambda$.",2202.07443v1
+2006-03-29,Unipolar Inductor Model coupled to GW emission: energy budget and model application to RX J0806+15 and RX J1914+24,"We further discuss the Unipolar Inductor Model (UIM) coupled to GW emission
+(Dall'Osso et al. 2005) and compare it to observed properties of the two
+candidate ultrashort period binaries RX J0806+15 and RX J1914+24 . We consider
+the measured orbital periods, period derivatives and inferred X-ray
+luminosities of these two sources and find constraints on system parameters in
+order for the model to account for them. We find that these properties point to
+the two sources being in different regimes of the UIM, with the requirement of
+low magnetic moment primaries ($\sim 10^{30} G cm^3$) for both. Given this weak
+magnetization, RX J0806+15 has a sufficiently low luminosity that it can be
+interpreted as having a primary spin almost synchronous to and just slightly
+slower than the orbital motion. Its measured orbital spin-up is only slightly
+affected by spin-orbit coupling and is mostly due to GW emission. RX J1914+24,
+on the other hand, is too bright in X-rays and has too slow an orbital spin-up
+for the same regime to apply. We suggest that this binary system may be
+emitting GWs at a significantly higher rate than implied by its measured
+$\dot{\omega}_o = 6 \times 10^{-17} rad s^{-2}$. The latter is explained, in
+this framework, by the primary spin being slightly faster than the orbital
+motion ($\alpha <or= 1.1$). In this case, the associated spin-orbit coupling
+transfers to the orbit a significant amount of angular momentum, thus partially
+balancing that lost to GW emission. All expectations can be tested in the near
+future to confirm the viability of the model.",0603795v1
+2012-01-23,Out-of-plane equilibrium spin current in a quasi-two-dimensional electron gas under in-plane magnetic field,"Equilibrium spin-current is calculated in a quasi-two-dimensional electron
+gas with finite thickness under in-plane magnetic field and in the presence of
+Rashba- and Dresselhaus spin-orbit interactions. The transverse confinement is
+modeled by means of a parabolic potential. An orbital effect of the in-plane
+magnetic field is shown to mix a transverse quantized spin-up state with
+nearest-neighboring spin-down states. The out-off-plane component of the
+equilibrium spin current appears to be not zero in the presence of an in-plane
+magnetic field, provided at least two transverse-quantized levels are filled.
+In the absence of the magnetic field the obtained results coincide with the
+well-known results, yielding cubic dependence of the equilibrium spin current
+on the spin-orbit coupling constants. The persistent spin-current vanishes in
+the absence of the magnetic field if Rashba- and Dresselhaus spin-orbit
+coefficients,{\alpha} and {\beta}, are equal each other. In-plane magnetic
+field destroys this symmetry, and accumulates a finite spin-current as {\alpha}
+\rightarrow {\beta}. Magnetic field is shown to change strongly the equilibrium
+current of the in-plane spin components, and gives new contributions to the
+cubic-dependent on spin-orbit constants terms. These new terms depend linearly
+on the spin-orbit constants.",1201.4683v1
+2013-04-12,"Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors","We construct the symmetry adapted low energy effective Hamiltonian for the
+electronic states in the vicinity of the Fermi level in iron based
+superconductors. We use Luttinger's method of invariants, expanding about Gamma
+and M points in the Brillouin zone corresponding to two iron unit cell, and
+then matching the coefficients of the expansion to the 5- and 8-band models. We
+then use the method of invariants to study the effects of the spin-density wave
+order parameters on the electronic spectrum, with and without spin-orbit
+coupling included. Among the results of this analysis is the finding that the
+nodal spin-density wave is unstable once spin-orbit coupling is included.
+Similar analysis is performed for the A_{1g} spin singlet superconducting
+state. Without spin-orbit coupling there is one pairing invariant near the
+Gamma point, but two near the M point. This leads to an isotropic spectral gap
+at the hole Fermi surface near Gamma, but anisotropic near M. The relative
+values of these three parameters determine whether the superconducting state is
+s_{++}, s_{+-}, or nodal. Inclusion of spin-orbit coupling leads to additional
+mixing of spin triplet pairing, with one additional pairing parameter near
+Gamma and one near M. This leads to an anisotropic spectral gap near both hole
+and electron Fermi surfaces, the latter no longer cross, but rather split.",1304.3723v1
+2017-09-08,Magnetoconductance correction in zinc-blende semiconductor nanowires with spin-orbit coupling,"We study the effects of spin-orbit coupling on the magnetoconductivity in
+diffusive cylindrical semiconductor nanowires. Following up on our former study
+on tubular semiconductor nanowires, we focus in this paper on nanowire systems
+where no surface accumulation layer is formed but instead the electron wave
+function extends over the entire cross section. We take into account the
+Dresselhaus spin-orbit coupling resulting from a zinc-blende lattice and the
+Rashba spin-orbit coupling, which is controlled by a lateral gate electrode.
+The spin relaxation rate due to Dresselhaus spin-orbit coupling is found to
+depend neither on the spin density component nor on the wire growth direction
+and is unaffected by the radial boundary. In contrast, the Rashba spin
+relaxation rate is strongly reduced for a wire radius that is smaller than the
+spin precession length. The derived model is fitted to the data of
+magnetoconductance measurements of a heavily doped back-gated InAs nanowire and
+transport parameters are extracted. At last, we compare our results to previous
+theoretical and experimental studies and discuss the occurring discrepancies.",1709.02621v2
+2006-12-05,Topological Change of the Fermi Surface in Low Density Rashba Gases: Application to Superconductivity,"Strong spin-orbit coupling can have a profound effect on the electronic
+structure in a metal or semiconductor, particularly for low electron
+concentrations. We show how, for small values of the Fermi energy compared to
+the spin-orbit splitting of Rashba type, a topological change of the Fermi
+surface leads to an effective reduction of the dimensionality in the electronic
+density of states. We investigate its consequences on the onset of the
+superconducting instability. We show, by solving the Eliashberg equations for
+the critical temperature as a function of spin-orbit coupling and electron
+density, that the superconducting critical temperature is significantly tuned
+in this regime by the spin-orbit coupling. We suggest that materials with
+strong spin-orbit coupling are good candidates for enhanced superconductivity.",0612107v1
+2008-03-03,Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4,"We present a first-principle study of spin-orbit coupling effects on the
+Fermi surface of Sr2RuO4 and Sr2RhO4. For nearly degenerate bands, spin-orbit
+coupling leads to a dramatic change of the Fermi surface with respect to
+non-relativistic calculations; as evidenced by the comparison with experiments
+on Sr2RhO4, it cannot be disregarded. For Sr2RuO4, the Fermi surface
+modifications are more subtle but equally dramatic in the detail: spin-orbit
+coupling induces a strong momentum dependence, normal to the RuO2 planes, for
+both orbital and spin character of the low-energy electronic states. These
+findings have profound implications for the understanding of unconventional
+superconductivity in Sr2RuO4.",0803.0352v1
+2013-05-09,Competing superfluid orders in spin-orbit coupled fermionic cold atom optical lattices,"The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state
+with non-zero total momentum Cooper pairs in a large magnetic field, was first
+predicted about 50 years ago, and since then became an important concept in
+many branches of physics. Despite intensive search in various materials,
+unambiguous experimental evidence for the FFLO phase is still lacking in
+experiments. In this paper, we show that both FF (uniform order parameter with
+plane-wave phase) and LO phase (spatially varying order parameter amplitude)
+can be observed using fermionic cold atoms in spin-orbit coupled optical
+lattices. The increasing spin-orbit coupling enhances the FF phase over the LO
+phase. The coexistence of superfluid and magnetic orders is also found in the
+normal BCS phase. The pairing mechanism for different phases is understood by
+visualizing superfluid pairing densities in different spin-orbit bands. The
+possibility of observing similar physics using spin-orbit coupled
+superconducting ultra-thin films is also discussed.",1305.2152v2
+2016-04-20,Topological Insulators from Electronic Superstructures,"The possibility of realizing topological insulators by spontaneous formation
+of electronic superstructure is theoretically investigated in a minimal
+two-orbital model including both the spin-orbit coupling and electron
+correlations on a triangular lattice. Using the mean-field approximation, we
+show that the model exhibits several different types of charge ordered
+insulators, where the charge disproportionation forms a honeycomb or kagome
+superstructure. We find that the charge ordered insulators in the presence of
+strong spin-orbit coupling can be topological insulators showing quantized spin
+Hall conductivity. Their band gap is dependent on electron correlations as well
+as the spin-orbit coupling, and even vanishes with showing the massless Dirac
+dispersion at the transition to a trivial charge ordered insulator. Our results
+suggest a new route to realize and control topological states of quantum matter
+by the interplay between the spin-orbit coupling and electron correlations.",1604.05851v2
+2013-09-29,Sensitively Temperature-Dependent Spin Orbit Coupling in SrIrO3 Thin Films,"Spin orbit coupling plays a non-perturbation effect in many recently
+developed novel fields including topological insulators and spin-orbit
+assistant Mott insulators. In this paper, strongly temperature-dependent spin
+orbit coupling, revealed by weak anti-localization, is observed at low
+temperature in 5d strongly correlated compound, SrIrO3. As the temperature
+rising, increase rate of Rashba coefficient is nearly 30%-45%/K. The increase
+is nearly 100 times over that observed in semiconductor heterostructures.
+Microscopically, the large increase of Rashba coefficient is attributed to the
+significant evolution of effective Land\'e g factor on temperature, whose
+mechanism is discussed. Sensitively temperature-dependent spin orbit coupling
+in SrIrO3 might be applied in spintronic devices",1309.7566v1
+2019-08-07,Thermodynamics of spin-orbit coupled bosons in two dimensions from complex Langevin,"We investigate the thermal properties of interacting spin-orbit coupled
+bosons with contact interactions in two spatial dimensions. To that end, we
+implement the complex Langevin method, motivated by the appearance of a sign
+problem, on a square lattice with periodic boundary conditions. We calculate
+the density equation of state non-perturbatively in a range of spin-orbit
+couplings and chemical potentials. Our results show that mean-field solutions
+tend to underestimate the average density, especially for stronger values of
+the spin-orbit coupling. Additionally, the finite nature of the simulation
+volume induces the formation of pseudo-condensates. These have been observed to
+be destroyed by the spin-orbit interactions.",1908.02715v2
+2023-06-21,Correlated Phases in Spin-Orbit-Coupled Rhombohedral Trilayer Graphene,"Recent experiments indicate that crystalline graphene multilayers exhibit
+much of the richness of their twisted counterparts, including cascades of
+symmetry-broken states and unconventional superconductivity. Interfacing Bernal
+bilayer graphene with a WSe$_2$ monolayer was shown to dramatically enhance
+superconductivity -- suggesting that proximity-induced spin-orbit coupling
+plays a key role in promoting Cooper pairing. Motivated by this observation, we
+study the phase diagram of spin-orbit-coupled rhombohedral trilayer graphene
+via self-consistent Hartree-Fock simulations, elucidating the interplay between
+displacement field effects, long-range Coulomb repulsion, short-range (Hund's)
+interactions, and substrate-induced Ising spin-orbit coupling. In addition to
+generalized Stoner ferromagnets, we find various flavors of intervalley
+coherent ground states distinguished by their transformation properties under
+electronic time reversal, ${\rm C}_3$ rotations, and an effective anti-unitary
+symmetry. We pay particular attention to broken-symmetry phases that yield
+Fermi surfaces compatible with zero-momentum Cooper pairing, identifying
+promising candidate orders that may support spin-orbit-enhanced
+superconductivity.",2306.12486v2
+2023-05-11,Non-thermal superconductivity in photo-doped multi-orbital Hubbard systems,"Superconductivity in laser-excited correlated electron systems has attracted
+considerable interest due to reports of light-induced superconducting-like
+states. Here we explore the possibility of non-thermal superconducting order in
+strongly interacting multi-orbital Hubbard systems, using non-equilibrium
+dynamical mean field theory. We find that a staggered $\eta$-type
+superconducting phase can be realized on a bipartite lattice in the high
+photo-doping regime, if the effective temperature of the photo-carriers is
+sufficiently low. The $\eta$ superconducting state is stabilized by Hund
+coupling - a positive Hund coupling favors orbital-singlet spin-triplet $\eta$
+pairing, whereas a negative Hund coupling stabilizes spin-singlet
+orbital-triplet $\eta$ pairing.",2305.06760v1
+2007-10-24,Spin-orbit induced interference in quantum corrals,"Lack of inversion symmetry at a metallic surface can lead to an observable
+spin-orbit interaction. For certain metal surfaces, such as the Au(111)
+surface, the experimentally observed spin-orbit coupling results in spin
+rotation lengths on the order of tens of nanometers, which is the typical
+length scale associated with quantum corral structures formed on metal
+surfaces. In this work, multiple scattering theory is used to calculate the
+local density of states (LDOS) of quantum corral structures comprised of
+nonmagnetic adatoms in the presence of spin-orbit coupling. Contrary to
+previous theoretical predictions, spin-orbit coupling induced modulations are
+observed in the theoretical LDOS, which should be observable using scanning
+tunneling microscopy.",0710.4587v1
+2008-04-21,"Magnetic phenomena, spin-orbit effects, and Landauer conductance in Pt nanowire contacts","Platinum monatomic nanowires were predicted to spontaneously develop
+magnetism, involving a sizable orbital moment via spin orbit coupling, and a
+colossal magnetic anisotropy. We present here a fully-relativistic (spin-orbit
+coupling included) pseudo-potential density functional calculation of
+electronic and magnetic properties, and of Landauer ballistic conductance of Pt
+model nanocontacts consisting of short nanowire segments suspended between Pt
+leads or tips, reprented by bulk planes. Even if short, and despite the
+nonmagnetic Pt leads, the nanocontact is found to be locally magnetic with
+magnetization strictly parallel to its axis. Especially under strain, the
+energy barrier to flip the overall spin direction is predicted to be tens of
+meV high, and thus the corresponding blocking temperatures large, suggesting
+the use of static Landauer ballistic electrical conductance calculations. We
+carry out such calculations, to find that inclusion of spin-orbit coupling and
+of magnetism lowers the ballistic conductance by about $15\div20$% relative to
+the nonmagnetic case, yielding $ G\sim 2 G_0$ ($G_0=2e^2/h$), in good agreement
+with break junction results. The spin filtering properties of this highly
+unusual spontaneously magnetic nanocontact are also analysed.",0804.3340v1
+2008-05-29,Wave packet dynamics in 2DEG with spin orbit coupling: splitting and zitterbewegung,"We study the effect of splitting and zitterbewegung of 1D and 2D electron
+wave packets in the semiconductor quantum well under the influence of the
+Rashba spin orbit coupling. Results of our investigations show that the spin
+orbit interaction induces dramatic qualitative changes in the evolution of spin
+polarized wave packet. The initial wave packet splits into two parts with
+different spin polarization propagating with unequal group velocity. This
+splitting appears due to the presence of two branches of electron spectrum
+corresponding to the stationary states with different chirality. It is
+demonstrated also that in the presence of external magnetic field B$
+perpendicular to the electron gas plane the wave packet splits into two parts
+which rotates with different cyclotron frequencies. It was shown that after
+some periods the electron density distributes around cyclotron orbit and the
+motion acquire an irregular character. Our calculations were made for both
+cases of weak and strong spin orbit coupling.",0805.4489v2
+2009-07-04,"Quantum rings with time dependent spin-orbit coupling: Rabi oscillations, spintronic Schrodinger-cat states, and conductance properties","The strength of the (Rashba-type) spin-orbit coupling in mesoscopic
+semiconductor rings can be tuned with external gate voltages. Here we consider
+the case of a periodically changing spin-orbit interaction strength as induced
+by sinusoidal voltages. In a closed one dimensional quantum ring with weak
+spin-orbit coupling, Rabi oscillations are shown to appear. We find that the
+time evolution of initially localized wave packets exhibits a series of
+collapse and revival phenomena. Partial revivals -- that are typical in
+nonlinear systems -- are shown to correspond to superpositions of states
+localized at different spatial positions along the ring. These ""spintronic
+Schrodinger-cat sates"" appear periodically, and similarly to their counterparts
+in other physical systems, they are found to be sensitive to environment
+induced disturbances. The time dependent spin transport problem, when leads are
+attached to the ring, is also solved. We show that the ""sideband currents""
+induced by the oscillating spin-orbit interaction strength can become the
+dominant output channel, even in the presence of moderate thermal fluctuations
+and random scattering events.",0907.0766v1
+2013-03-12,Spin-orbit coupling in hydrogenated graphene,"First-principles calculations of the spin-orbit coupling in graphene with
+hydrogen adatoms in dense and dilute limits are presented. The chemisorbed
+hydrogen induces a giant local enhancement of spin-orbit coupling due to $sp^3$
+hybridization which depends strongly on the local lattice distortion. Guided by
+the reduced symmetry and the local structure of the induced dipole moments we
+use group theory to propose realistic minimal Hamiltonians that reproduce the
+relevant spin-orbit effects for both single-side semihydrogenated graphene
+(graphone) and for a single hydrogen adatom in a large supercell. The principal
+linear spin-orbit band splittings are driven by the breaking of the local
+pseudospin inversion symmetry and the emergence of spin flips on the same
+sublattice.",1303.2806v1
+2015-11-23,Spin-orbit coupling controlled ground state in Sr$_2$ScOsO$_6$,"We report neutron scattering experiments which reveal a large spin gap in the
+magnetic excitation spectrum of weakly-monoclinic double perovskite Sr2ScOsO6.
+The spin gap is demonstrative of appreciable spin-orbit-induced anisotropy,
+despite nominally orbitally-quenched 5d3 Os5+ ions. The system is successfully
+modeled including nearest neighbor interactions in a Heisenberg Hamiltonian
+with exchange anisotropy. We find that the presence of the spin-orbit-induced
+anisotropy is essential for the realization of the type I antiferromagnetic
+ground state. This demonstrates that physics beyond the LS or JJ coupling
+limits plays an active role in determining the collective properties of 4d3 and
+5d3 systems, and that theoretical treatments must include spin-orbit coupling.",1511.07486v3
+2020-05-05,"Heterostructures of graphene and topological insulators Bi$_2$Se$_3$, Bi$_2$Te$_3$, and Sb$_2$Te$_3$","Prototypical three-dimensional topological insulators of the Bi$_2$Se$_3$
+family provide a beautiful example of the appearance of the surface states
+inside the bulk band gap caused by spin-orbit coupling-induced topology. The
+surface states are protected against back scattering by time reversal symmetry,
+and exhibit spin-momentum locking whereby the electron spin is polarized
+perpendicular to the momentum, typically in the plane of the surface. On the
+other hand, graphene is a prototypical two-dimensional material, with
+negligible spin-orbit coupling. When graphene is placed on the surface of a
+topological insulator, giant spin-orbit coupling is induced by the proximity
+effect, enabling interesting novel electronic properties of its Dirac
+electrons. We present a detailed theoretical study of the proximity effects of
+monolayer graphene and topological insulators Bi$_2$Se$_3$, Bi$_2$Te$_3$, and
+Sb$_2$Te$_3$, and elucidate the appearance of the qualitatively new spin-orbit
+splittings well described by a phenomenological Hamiltonian, by analyzing the
+orbital decomposition of the involved band structures. This should be useful
+for building microscopic models of the proximity effects between the surfaces
+of the topological insulators and graphene.",2005.02026v1
+2020-05-18,Cooperative orbital moments and edge magnetoresistance in monolayer WTe$_2$,"We argue that edge electrons in monolayer WTe$_2$ can possess a ""cooperative""
+orbital moment (COM) that critically impacts its edge magnetoresistance
+behavior. Arising from the cooperative action of both Rashba and Ising spin
+orbit coupling, COM quickly achieves large magnitudes (of order few Bohr
+magnetons) even for relatively small spin-orbit coupling strengths. As we
+explain, such large COM magnitudes arise from an unconventional cooperative
+spin canting of edge spins when Rashba and Ising spin orbit coupling act
+together. Strikingly, COM can compete with spin moments to produce an unusual
+anisotropic edge magnetoresistance oriented at an oblique angle. In particular,
+this competition produces a direction along which $\mathbf{B}$ is ineffective
+at gapping out the edge spectrum leaving it nearly gapless. As a result, large
+contrasts in gap sizes manifest as $\mathbf{B}$ is rotated granting giant
+anisotropic magnetoresistance of 0.1-10 million % at 10 T and low temperature.",2005.08986v1
+2020-09-10,Global polarization effect and spin-orbit coupling in strong interaction,"In non-central high energy heavy ion collisions the colliding system posses a
+huge orbital angular momentum in the direction opposite to the normal of the
+reaction plane. Due to the spin-orbit coupling in strong interaction, such huge
+orbital angular momentum leads to the polarization of quarks and anti-quarks in
+the same direction. This effect, known as the global polarization effect, has
+been recently observed by STAR Collaboration at RHIC that confirms the
+theoretical prediction made more than ten years ago. The discovery has
+attracted much attention on the study of spin effects in heavy ion collision.
+It opens a new window to study properties of QGP and a new direction in high
+energy heavy ion physics -- Spin Physics in Heavy Ion Collisions. In this
+chapter, we review the original ideas and calculations that lead to the
+predictions. We emphasize the role played by spin-orbit coupling in high energy
+spin physics and discuss the new opportunities and challenges in this
+connection.",2009.04803v2
+2016-10-06,Copper adatoms on graphene: theory of orbital and spin-orbital effects,"We present a combined DFT and model Hamiltonian analysis of spin-orbit
+coupling in graphene induced by copper adatoms in the bridge and top positions,
+representing isolated atoms in the dilute limit. The orbital physics in both
+systems is found to be surprisingly similar, given the fundamental difference
+in the local symmetry. In both systems the Cu p and d contributions at the
+Fermi level are very similar. Based on the knowledge of orbital effects we
+identify that the main cause of the locally induced spin-orbit couplings are Cu
+p and d orbitals. By employing the DFT+U formalism as an analysis tool we find
+that both the p and d orbital contributions are equally important to spin-orbit
+coupling, although p contributions to the density of states are much higher. We
+fit the DFT data with phenomenological tight-binding models developed
+separately for the top and bridge positions. Our model Hamiltonians describe
+the low-energy electronic band structure in the whole Brillouin zone and allow
+us to extract the size of the spin-orbit interaction induced by the local Cu
+adatom to be in the tens of meV. By application of the phenomenological models
+to Green's function techniques, we find that copper atoms act as resonant
+impurities in graphene with large lifetimes of 50 and 100~fs for top and
+bridge, respectively.",1610.01798v1
+2013-10-14,Ballistic spin resonance in multisubband quantum wires,"Ballistic spin resonance was experimentally observed in a
+quasi-one-dimensional wire by Frolov et al. [Nature (London) 458, 868 (2009)].
+The spin resonance was generated by a combination of an external static
+magnetic field and the oscillating effective spin-orbit magnetic field due to
+periodic bouncings of the electrons off the boundaries of a narrow channel. An
+increase of the D'yakonov-Perel spin relaxation rate was observed when the
+frequency of the spin-orbit field matched that of the Larmor precession
+frequency around the external magnetic field. Here we develop a model to
+account for the D'yakonov-Perel mechanism in multisubband quantum wires with
+both the Rashba and Dresselhaus spin-orbit interactions. Considering elastic
+spin-conserving impurity scatterings in the time-evolution operator (Heisenberg
+representation), we extract the spin relaxation time by evaluating the
+time-dependent average of the spin operators. The magnetic field dependence of
+the nonlocal voltage, which is related to the spin relaxation time behavior,
+shows a wide plateau, in agreement with the experimental observation. This
+plateau arises due to injection in higher subbands and small-angle scattering.
+In this quantum mechanical approach, the spin resonance occurs near the
+spin-orbit induced energy anticrossings of the quantum wire subbands with
+opposite spins. We also predict anomalous dips in the spin relaxation time as a
+function of the magnetic field in systems with strong spin-orbit couplings.",1310.3707v2
+2011-02-07,Impact of spin-orbit coupling on the Holstein polaron,"We utilize an exact variational numerical procedure to calculate the ground
+state properties of a polaron in the presence of a Rashba-like spin orbit
+interaction. Our results corroborate with previous work performed with the
+Momentum Average approximation and with weak coupling perturbation theory. We
+find that spin orbit coupling increases the effective mass in the regime with
+weak electron phonon coupling, and decreases the effective mass in the
+intermediate and strong electron phonon coupling regime. Analytical strong
+coupling perturbation theory results confirm our numerical results in the small
+polaron regime. A large amount of spin orbit coupling can lead to a significant
+lowering of the polaron effective mass.",1102.1421v1
+2013-07-10,"Scaling of spin Hall angle in 3d, 4d and 5d metals from Y3Fe5O12/metal spin pumping","Pure spin currents generated by spin pumping in ferromagnet/nonmagnet (FM/NM)
+bilayers produce inverse spin Hall effect (ISHE) voltages in the NM, from which
+spin pumping and transport characteristics of the NM can be extracted. Due to
+its exceptionally low damping, Y3Fe5O12 (YIG) is an important and widely used
+FM for microwave devices and ferromagnetic resonance (FMR) spin pumping. Here
+we report systematic investigation of spin pumping from 20-nm thick YIG thin
+films to a series of 3d, 4d and 5d normal metals (Cu, Ag, Ta, W, Pt and Au)
+with various spin-orbit coupling strengths. From enhanced Gilbert damping
+obtained from the frequency dependence of FMR linewidths and ISHE signals, the
+spin Hall angles and YIG/NM interfacial spin mixing conductances are
+quantitatively determined for these metals. The spin Hall angles largely vary
+as the fourth power of the atomic number, corroborating the dominant role of
+spin-orbit coupling across a broad range in the inverse spin Hall effect.",1307.2648v2
+2015-05-14,Crossover between spin swapping and Hall effect in metallic systems,"We theoretically study the crossover between spin Hall effect and spin
+swapping, a recently predicted phenomenon that consists in the interchange
+between the current flow and its spin polarization directions [Lifshits and
+Dyakonov, Phys. Rev. Lett. 103, 186601 (2009)]. Using a tight-binding model
+with spin-orbit coupled disorder, spin Hall effect, spin relaxation and spin
+swapping are treated on equal footing. We demonstrate that spin Hall effect and
+spin swapping present very different dependences as a function of the
+spin-orbit coupling and disorder strengths. As a consequence, we show that spin
+swapping may even exceed spin Hall effect. Three set-ups are proposed for the
+experimental observation of the spin swapping effect in metals.",1505.03661v1
+2002-09-21,Dynamical spin-electric coupling in a quantum dot,"Due to the spin-orbital coupling in a semiconductor quantum dot, a freely
+precessing electron spin produces a time-dependent charge density. This creates
+a sizeable electric field outside the dot, leading to promising applications in
+spintronics. The spin-electric coupling can be employed for non-invasive single
+spin detection by electrical methods. We also consider a spin relaxation
+mechanism due to long-range coupling to electrons in gates and elsewhere in the
+system, and find a contribution comparable to, and in some cases dominant over
+previously discussed mechanisms.",0209507v1
+2015-03-17,Coupled wire construction of chiral spin liquids,"We develop a coupled wire construction of chiral spin liquids. The starting
+point are individual wires of electrons in the Mott regime that are subject to
+a Zeeman field and Rashba spin-orbit coupling. Suitable spin-flip couplings
+between the wires yield an Abelian chiral spin liquid state which supports
+spinon excitations above a bulk gap, and chiral edge states. The approach
+generalizes to non-Abelian chiral spin liquids at level k with parafermionic
+edge states.",1503.05051v2
+2005-08-12,Electron spin-orbit splitting in InGaAs/InP quantum well studied by means of the weak antilocalization and spin-zero effects in tilted magnetic fields,"The coupling between Zeeman spin splitting and Rashba spin-orbit terms has
+been studied experimentally in a gated InGaAs/InP quantum well structure by
+means of simultaneous measurements of the weak antilocalization (WAL) effect
+and beating in the SdH oscillations. The strength of the Zeeman splitting was
+regulated by tilting the magnetic field with the spin-zeros in the SdH
+oscillations, which are not always present, being enhanced by the tilt. In
+tilted fields the spin-orbit and Zeeman splittings are not additive, and a
+simple expression is given for the energy levels. The Rashba parameter and the
+electron g-factor were extracted from the position of the spin zeros in tilted
+fields. A good agreement is obtained for the spin-orbit coupling strength from
+the spin-zeros and weak antilocalization measurements.",0508328v2
+2007-08-04,Spin Injection in Quantum Wells with Spatially Dependent Rashba Interaction,"We consider Rashba spin-orbit effects on spin transport driven by an electric
+field in semiconductor quantum wells. We derive spin diffusion equations that
+are valid when the mean free path and the Rashba spin-orbit interaction vary on
+length scales larger than the mean free path in the weak spin-orbit coupling
+limit. From these general diffusion equations, we derive boundary conditions
+between regions of different spin-orbit couplings. We show that spin injection
+is feasible when the electric field is perpendicular to the boundary between
+two regions. When the electric field is parallel to the boundary, spin
+injection only occurs when the mean free path changes within the boundary, in
+agreement with the recent work by Tserkovnyak et al. [cond-mat/0610190].",0708.0597v1
+2008-12-10,Spin-Orbit-Mediated Spin Relaxation in Graphene,"We investigate how spins relax in intrinsic graphene. The spin-orbit coupling
+arises from the band structure and is enhanced by ripples. The orbital motion
+is influenced by scattering centers and ripple-induced gauge fields. Spin
+relaxation due to Elliot-Yafet and Dyakonov-Perel mechanisms and gauge fields
+in combination with spin-orbit coupling are discussed. In intrinsic graphene,
+the Dyakonov-Perel mechanism and spin flip due to gauge fields dominate and the
+spin-flip relaxation time is inversely proportional to the elastic scattering
+time. The spin relaxation anisotropy depends on an intricate competition
+between these mechanisms. Experimental consequences are discussed.",0812.1921v3
+2018-04-27,Electrical control of a confined electron spin in a silicene quantum dot,"We study spin control for an electron confined in a flake of silicene. We
+find that the lowest-energy conduction-band levels are split by the diagonal
+intrinsic spin-orbit coupling into Kramers doublets with a definite projection
+of the spin on the orbital magnetic moment. We study the spin control by AC
+electric fields using the non-diagonal Rashba component of the spin-orbit
+interactions with the time-dependent atomistic tight-binding approach. The
+Rashba interactions in AC electric fields produce Rabi spin-flips times of the
+order of a nanosecond. These times can be reduced to tens of picoseconds
+provided that the vertical electric field is tuned to an avoided crossing open
+by the Rashba spin-orbit interaction. We demonstrate that the speedup of the
+spin transitions is possible due to the intervalley coupling induced by the
+armchair edge of the flake. The study is confronted with the results for
+circular quantum dots decoupled from the edge with well defined angular
+momentum and valley index.",1804.10496v1
+2017-04-13,The influence of anisotropic Rashba spin-orbit coupling on current-induced spin polarization in graphene,"We consider a disordered graphene layer with anisotropic Rashba spin-orbit
+coupling subjected to a longitudinal electric field. Using the linear response
+theory we calculate current-induced spin polarization including in-plane normal
+and parallel components with respect to the electric field direction. Unlike
+the case of isotropic Rashba spin-orbit where the normal component of spin
+polarization is linear in terms of Fermi energy around the Dirac point,
+anisotropic Rashba spin-orbit can result in non-linear dependence of this
+component at such energies within the Lifshitz points. Furthermore, we show
+that anisotropic Rashba interaction allows for tuning the direction of spin
+polarization from perpendicular direction to the parallel one such that for
+certain values of Rashba parameters the magnitudes of both components can also
+be quenched. The effect of carriers scattering on randomly distributed
+non-magnetic disorders is also taken into account by calculating vertex
+correction. This results in modification of spin polarization components
+depending on the relative strength of Rashba parameters.",1704.04188v2
+2020-01-01,Pseudo-spin rotation symmetry breaking by Coulomb interaction terms in spin-orbit coupled systems,"By transforming from the pure-spin-orbital ($t_{\rm 2g}$) basis to the
+spin-orbital entangled pseudo-spin-orbital basis, the pseudo-spin rotation
+symmetry of the different Coulomb interaction terms is investigated under SU(2)
+transformation in pseudo-spin space. While the Hubbard and density interaction
+terms are invariant, the Hund's coupling and pair-hopping interaction terms
+explicitly break pseudo-spin rotation symmetry systematically. The form of the
+symmetry-breaking terms obtained from the transformation of the Coulomb
+interaction terms accounts for the easy $x$-$y$ plane anisotropy and magnon gap
+for the out-of-plane mode, highlighting the importance of mixing with the
+nominally non-magnetic $J$=3/2 sector, and providing a physically transparent
+approach for investigating magnetic ordering and anisotropy effects in
+perovskite ($\rm Sr_2 Ir O_4$) and other $d^5$ pseudo-spin compounds.",2001.00190v2
+2019-01-11,Spin-orbit torques in heavy metal/ferromagnet bilayers with varying strength of interfacial spin-orbit coupling,"Despite intense efforts it has remained unresolved whether and how
+interfacial spin-orbit coupling (ISOC) affects spin transport across heavy
+metal (HM)/ferromagnet (FM) interfaces. Here we report conclusive experiment
+evidence that the ISOC at HM/FM interfaces is the dominant mechanism for ""spin
+memory loss"". An increase in ISOC significantly reduces, in a linear manner,
+the dampinglike spin-orbit torque (SOT) exerted on the FM layer via degradation
+of the spin transparency of the interface for spin currents generated in the
+HM. In addition, the fieldlike SOT is also dominated by the spin Hall
+contribution of the HM and decreases with increasing ISOC. This work reveals
+that ISOC at HM/FM interfaces should be minimized to advance efficient SOT
+devices through atomic layer passivation of the HM/FM interface or other means.",1901.03632v1
+2007-01-08,Post-Newtonian gravitational radiation and equations of motion via direct integration of the relaxed Einstein equations. IV. Radiation reaction for binary systems with spin-spin coupling,"Using post-Newtonian equations of motion for fluid bodies that include
+radiation-reaction terms at 2.5 and 3.5 post-Newtonian (PN) order O[(v/c)^5]
+and O[(v/c)^7] beyond Newtonian order), we derive the equations of motion for
+binary systems with spinning bodies, including spin-spin effects. In particular
+we determine the effects of radiation-reaction coupled to spin-spin effects on
+the two-body equations of motion, and on the evolution of the spins. We find
+that radiation damping causes a 3.5PN order, spin-spin induced precession of
+the individual spins. This contrasts with the case of spin-orbit coupling,
+where there is no effect on the spins at 3.5PN order. Employing the equations
+of motion and of spin precession, we verify that the loss of total energy and
+total angular momentum induced by spin-spin effects precisely balances the
+radiative flux of those quantities calculated by Kidder et al.",0701047v2
+2013-02-27,Ferromagnetic to antiferromagnetic transition of one-dimensional spinor Bose gases with spin-orbit coupling,"We have analytically solved one-dimensional interacting two-component bosonic
+gases with spin-orbit (SO) coupling by the Bethe-ansatz method. Through a gauge
+transformation, the effect of SO coupling is incorporated into a spin-dependent
+twisted boundary condition. Our result shows that the SO coupling can influence
+the eigenenergy in a periodical pattern. The interplay between interaction and
+SO coupling may induce the energy level crossing for the ground state, which
+leads to a transition from the ferromagnetic to antiferromagnetic state.",1302.6901v2
+2002-12-16,Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model,"We study a new version of the one-dimensional spin-orbital model with spins
+S=1 relevant to cubic vanadates. At small Hund's coupling J_H we discover
+dimerization in a pure electronic system solely due to a dynamical spin-orbital
+coupling. Above a critical value J_H, a uniform ferromagnetic state is
+stabilized at zero temperature. More surprisingly, we observe a temperature
+driven dimerization of the ferrochain, which occurs due to a large entropy
+released by dimer states. This dynamical dimerization seems to be the mechanism
+driving the peculiar intermediate phase of YVO_3.",0212368v1
+2008-09-26,Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models,"We study the magnetic interactions in Mott-Hubbard systems with partially
+filled $t_{2g}$-levels and with strong spin-orbit coupling. The latter
+entangles the spin and orbital spaces, and leads to a rich variety of the low
+energy Hamiltonians that extrapolate from the Heisenberg to a quantum compass
+model depending on the lattice geometry. This gives way to ""engineer"" in such
+Mott insulators an exactly solvable spin model by Kitaev relevant for quantum
+computation. We, finally, explain ""weak"" ferromagnetism, with an anomalously
+large ferromagnetic moment, in Sr$_2$IrO$_4$.",0809.4658v2
+2009-11-04,Nonvanishing anisotropic magnetoresistance in Rashba two-dimensional electron systems with nonmagnetic disorders,"We study anisotropic magnetoresistance (AMR) in a spin-polarized
+two-dimensional electron gas with Rashba spin-orbit coupling and nonmagnetic
+disorder collision. We show that AMR exists, arising from the combined effect
+of in-plane magnetization, spin-orbit coupling, and nonmagnetic remote disorder
+scattering. Further, numerical evaluation demonstrates that the smoothness of
+the remote disorder can strongly affect AMR, and this AMR is sensitive to the
+electron density. Large magnitude of AMR ($\approx24%$) is obtained for low
+density system with strong spin-orbit splitting.",0911.0732v1
+2014-02-28,$^{3}$He-R: A Topological $s^{\pm}$ Superfluid with Triplet Pairing,"We show that when spin and orbital angular momenta are entangled by
+spin-orbit coupling, this transforms a topological spin-triplet
+superfluid/superconductor state, such as $^{3}$He-B, into a topological
+$s^{\pm}$ state, with non-trivial gapless edge states. Similar to $^{3}$He-B,
+the $s^{\pm}$ state also minimizes on-site Coulomb repulsion for weak to
+moderate interactions. A topological phase transition into a $d$-wave state
+occurs for sufficiently strong spin-orbit coupling.",1402.7372v2
+2016-04-28,Spin evolution of cold atomic gases in SU(2)$\otimes $U(1) fields,"We consider response function and spin evolution in spin-orbit coupled cold
+atomic gases in a synthetic gauge magnetic field influencing solely the orbital
+motion of atoms. We demonstrate that various regimes of spin-orbit coupling
+strength, magnetic field, and disorder can be treated within a single approach
+based on the representation of atomic motion in terms of auxiliary collective
+classical trajectories. Our approach allows for a unified description of
+fermionic and bosonic gases.",1604.08522v1
+2021-09-17,Anomalous Hall effect in the coplanar antiferromagnetic coloring-triangular lattice,"We study the anomalous Hall effect on the antiferromagnetic
+coloring-triangular lattice with a coplanar magnetic configuration in presence
+of a spin-orbit interaction. The effect of the spin-orbit coupling is included
+at effective level as a rotation of the electronic spin as the electrons hop
+from site to site. Our result reveals that a finite Hall conductivity in the
+planar 120$^{\circ}$ structure takes place if a finite spin-orbit coupling is
+present. A quantized Hall conductivity occurs at global band gaps resulting
+from the topologically non-trivial band structure.",2109.08570v1
+2022-02-21,Chiral superconductivity in cuprates mediated by spin-orbit coupling to spinon superfluidity,"We utilize the Hubbard model to demonstrate that doping of the
+antiferromagnetic parent compounds of cuprate superconductors stabilizes a spin
+liquid state. Superconductivity in such a state emerges due to the spin-orbit
+coupling between charge current and superfluidity of spinon condensate,
+resulting in a chiral relation between the order parameter phase gradient and
+supercurrent. We propose simple experimental tests for the presented mechanism.",2202.09965v5
+1999-05-18,Spin-orbit scattering in d-wave superconductors,"When non-magnetic impurities are introduced in a d-wave superconductor, both
+thermodynamic and spectral properties are strongly affected if the impurity
+potential is close to the strong resonance limit. In addition to the scalar
+impurity potential, the charge carriers are also spin-orbit coupled to the
+impurities. Here it is shown that (i) close to the unitarity limit for the
+impurity scattering, the spin-orbit contribution is of the same order of
+magnitude than the scalar scattering and cannot be neglected, (ii) the
+spin-orbit scattering is pair-breaking and (iii) induces a small id_xy
+component to the off-diagonal part of the self-energy.",9905262v1
+2003-01-06,"Orbital-Spin Structure and Coupling to Lattice in RTiO$_3$ with R=La,Pr,Nd and Sm","The origin of the G-type antiferromagnetism (AFM(G)) and puzzling properties
+of RTiO$_3$ with R=La are studied. We clarify that the crystal field from La
+caused by the GdFeO$_3$-type distortion lifts the $t_{2g}$ degeneracy at Ti 3d
+orbitals. The lift stabilizes the AFM(G) with spin-exchange constant in
+agreement with neutron scattering results. The orbital-spin structures for
+R=Pr, Nd and Sm are also consistent with experiments. We propose that the
+GdFeO$_3$-type distortion has a universal mechanism of controlling orbital-spin
+structure competing with the Jahn-Teller (JT) mechanism.",0301049v1
+1996-02-07,The Breathing Modes of the $B=2$ Skyrmion and the Spin-Orbit Interaction,"The coupling of the breathing and rotational modes of the skyrmion-skyrmion
+system leads to a nucleon-nucleon spin-orbit interaction of short range, as
+well as to spin-orbit potentials for the transitions $NN \to N(1440)N$, $NN \to
+NN(1440)$ and $NN \to N(1440)N(1440)$. The longest range behaviour of these
+spin-orbit potentials is calculated in closed form.",9602008v1
+2009-02-25,Curvature-induced anisotropic spin-orbit splitting in carbon nanotubes,"We have theoretically explored the spin-orbit interaction in carbon
+nanotubes. We have found that, besides the dependence on chirality and
+diameter, the effects of spin-orbit coupling are anisotropic: spin splitting is
+larger for the higher valence or the lower electron band depending on the
+specific tube. Different tube behaviors can be grouped in three families,
+according to the so called chiral index. Curvature-induced changes in the
+orbital hybridization have a crucial role, and they are shown to be
+family-dependent. Our results explain recent experiments without invoking
+external fields.",0902.4401v1
+2011-04-28,Spin and Orbital Characters of Excitations in Iron Arsenide Superconductors Revealed by Simulated Fe L-Edge RIXS,"We theoretically examine the orbital excitations coupled to the spin degree
+of freedom in the parent state of the iron-arsenide superconductor, based on
+the calculation in a five-band itinerant model. The calculated Fe $L_3$-edge
+resonant inelastic x-ray scattering (RIXS) spectra disclose the presence of
+spin-flip excitations involving several specific orbitals. Magnon excitations
+predominantly composed of a single orbital component can be seen in
+experiments, although its spectral weight is smaller than spin-flipped
+interorbital high-energy excitations. The detailed polarization and momentum
+dependence is also discussed with predictions for the experiments.",1104.5424v2
+2019-05-14,Thermodynamics of symmetric spin--orbital model: One- and two-dimensional cases,"The specific heat and susceptibilities for the two- and one-dimensional
+spin--orbital models are calculated in the framework of a spherically symmetric
+self-consistent approach at different temperatures and relations between the
+parameters of the system. It is shown that even in the absence of the
+long-range spin and orbital order, the system exhibits the features in the
+behavior of thermodynamic characteristics, which are typical of those
+manifesting themselves at phase transitions. Such features are attributed to
+the quantum entanglement of the coupled spin and orbital degrees of freedom.",1905.05791v1
+2009-12-22,Inelastic decay rate of quasiparticles in a two-dimensional spin-orbit coupled electron system,"We present a study of the inelastic decay rate of quasiparticles in a
+two-dimensional electron gas with spin-orbit interaction. The study is done
+within the G0W0 approximation. The spin-orbit interaction is taken in the most
+general form that includes both Rashba and Dresselhaus contributions linear in
+magnitude of the electron 2D momentum. Spin-orbit interaction effect on the
+inelastic decay rate is examined at different parameters characterizing the
+interaction strength in the electron gas.",0912.4358v2
+2018-03-17,Emergence of spin-orbit order in the spinel CuCr$_2$O$_4$,"We determined the magnetic structure of CuCr$_2$O$_4$ using neutron
+diffraction and irreducible representation analysis. The measurements
+identified a new phase between 155 K and 125 K as nearly collinear magnetic
+ordering in the Cr pyrochlore lattice. Below 125 K, a Cu-Cr ferrimagnetic
+component develops the noncollinear order. Along with the simultaneously
+obtained O positions and the quantum effect of spin-orbit coupling, the
+magnetic structure is understood to involve spin-orbit ordering, accompanied by
+an appreciably deformed orbital of presumably spin-only Cu and Cr.",1803.06447v1
+2017-07-06,Antisymmetric Spin-Orbit Coupling Effect on Kondo-Induced Electric Polarization in a Triangular Triple Quantum Dot,"We study the local antisymmetric spin-orbit (ASO) coupling effect on spin,
+orbital, and charge degrees of freedom for the Kondo effect in a triangular
+triple quantum dot (TTQD). Here, one of the three QDs is coupled to a metallic
+lead through electron tunneling, and a local electric polarization is induced
+by the Kondo effect. The ASO interaction is introduced in the other two coupled
+QDs on the opposite side of the lead. Generally, the ASO coupling effect is
+very weak and not easily detectable, but it essentially causes spin and charge
+reconfigurations in the TTQD through the Kondo effect. Using an extended
+Anderson model for the TTQD Kondo system, we elucidate that the ASO coupling
+gives rise to a considerable reduction of the emergent electric polarization,
+as a consequence of the parity mixing of molecular orbitals in the triangular
+loop as well as the spin-up and spin-down coupling of local electrons. The
+latter leads to a local diamagnetic susceptibility owing to the ASO coupled
+spins. We also show that the Kondo-induced electric polarization can be
+controlled by the ASO coupling as well as by the magnetic flux penetrating
+through the TTQD.",1707.01676v1
+2023-06-20,Spin-orbit interaction enabled electronic Raman scattering from charge collective modes,"Electronic Raman scattering in the fully symmetric channel couples to the
+charge excitations in the system, including the plasmons. However, the plasmon
+response has a spectral weight of $\sim q^2$, where $q$, the momentum
+transferred by light, is small. In this work, we show that in inversion
+symmetry broken systems where Rashba type spin-orbit coupling affects the
+states at the Fermi energy (which is a known low energy effect) as well as the
+transition elements to other states (a high energy effect), there is an
+additional coupling of the plasmons to the Raman vertex, even at zero momentum
+transfer, that results in a spectral weight that is proportional to the
+spin-orbit coupling. The high energy effect is due to the breaking of SU(2)
+spin invariance in the spin-flip transitions to the intermediate state. We
+present a theory for this coupling near the resonant regime of Raman scattering
+and show that in giant Rashba systems it can dominate over the conventional
+$q^2$ weighted coupling. We also provide experimental support along with a
+symmetry based justification for this spin-mediated coupling by identifying a
+prominent c-axis plasmon peak in the fully symmetric channel of the resonant
+Raman spectrum of the giant Rashba material BiTeI. This new coupling could lead
+to novel ways of manipulating coherent charge excitations in inversion-broken
+systems. This process is also relevant for spectroscopic studies in ultrafast
+spectroscopies, certain driven Floquet systems and topologically non-trivial
+phases of matter where strong inversion-breaking spin-orbit coupling plays a
+role.",2306.11240v2
+2016-08-10,Competing interactions in population-imbalanced two-component Bose-Einstein condensates,"We consider a two-component Bose-Einstein condensate with and without
+synthetic ""spin-orbit"" interactions in two dimensions. Density- and
+phase-fluctuations of the condensate are included, allowing us to study the
+impact of thermal fluctuations and density-density interactions on the physics
+originating with spin-orbit interactions. In the absence of spin-orbit
+interactions, we find that inter-component density interactions deplete the
+minority condensate. The thermally driven phase transition is driven by coupled
+density and phase-fluctuations, but is nevertheless shown to be a
+phase-transition in the Kosterlitz-Thouless universality class with close to
+universal amplitude ratios irrespective of whether both the minority- and
+majority condensates exist in the ground state, or only one condensate exists.
+In the presence of spin-orbit interactions we observe three separate phases,
+depending on the strength of the spin-orbit coupling and inter-component
+density-density interactions: a phase-modulated phase with uniform amplitudes
+for small intercomponent interactions, a completely imbalanced, effectively
+single-component, condensate for intermediate spin-orbit coupling strength and
+suficciently large inter-component interactions, and a phase-modulated
+\textit{and} amplitude-modulated phase for sufficiently large values of both
+the spin-orbit coupling and the inter-component density-density interactions.
+The phase which is modulated by a single $\bv q$-vector only is observed to
+transition into an isoptropic liquid through a strong de-pinning transition
+with periodic boundary conditions, which weakens with open boundaries.",1608.03300v1
+2019-10-01,Low-symmetry nanowire cross-sections for enhanced Dresselhaus spin-orbit interaction,"We study theoretically the spin-orbit interaction of low-energy electrons in
+semiconducting nanowires with a zinc-blende lattice. The effective Dresselhaus
+term is derived for various growth directions, including <11(-2)>-oriented
+nanowires. While a specific configuration exists where the Dresselhaus
+spin-orbit coupling is suppressed even at confinement potentials of low
+symmetry, many configurations allow for a strong Dresselhaus coupling. In
+particular, we discuss qualitative and quantitative results for nanowire
+cross-sections modeled after sectors of rings or circles. The parameter
+dependence is analyzed in detail, enabling predictions for a large variety of
+setups. For example, we gain insight into the spin-orbit coupling in recently
+fabricated GaAs-InAs nanomembrane-nanowire structures. By combining the
+effective Dresselhaus and Rashba terms, we find that such structures are
+promising platforms for applications where an electrically controllable
+spin-orbit interaction is needed. If the nanowire cross-section is scaled down
+and InAs replaced by InSb, remarkably high Dresselhaus-based spin-orbit
+energies of the order of millielectronvolt are expected. A Rashba term that is
+similar to the effective Dresselhaus term can be induced via electric gates,
+providing means to switch the spin-orbit interaction on and off. By varying the
+central angle of the circular sector, we find, among other things, that
+particularly strong Dresselhaus couplings are possible when nanowire
+cross-sections resemble half-disks.",1910.00562v1
+2002-02-14,Spin and Orbital States and Their Phase Transitions of the Perovskite-Type Ti Oxides: Weak coupling Approach,"The magnetic phase diagram of the perovskite-type Ti oxides as a function of
+the GdFeO3-type distortion is examined by using the Hartree-Fock analysis of a
+multiband d-p Hamiltonian from a viewpoint of competitions of the spin-orbit
+interaction, the Jahn-Teller (JT) level-splitting and spin-orbital
+superexchange interactions. Near the antiferromagnetic (AFM)-to-ferromagnetic
+(FM) phase boundary, A-type AFM [AFM(A)] and FM states accompanied by a certain
+type of orbital ordering are lowered in energy at large JT distortion, which is
+in agreement with the previous strong coupling study. With increasing the
+GdFeO3-type distortion, their phase transition occurs. Through this magnetic
+phase transition, the orbital state hardly changes, which induces nearly
+continuous change in the spin coupling along the c-axis from negative to
+positive. The resultant strong two-dimensionality in the spin coupling near the
+phase boundary is attributed to the strong suppression of T_N and T_C, which is
+experimentally observed. On the other hand, at small GdFeO3-type without JT
+distortions, which correspond to LaTiO3, the most stable solution is not G-type
+AFM [AFM(G)] but FM. Although the spin-orbit interaction has been considered to
+be relevant at the small or no JT distortion of LaTiO3 in the literature, our
+analysis indicates that the spin-orbit interaction is irrelevant to the AFM(G)
+state in LaTiO3 and superexchange-type interaction dominates. On the basis of
+further investigations on the nature of this FM state and other solutions, this
+discrepancy is discussed in detail.",0202242v1
+1999-04-30,Does spin-orbit coupling play a role in metal-nonmetal transition in two-dimensional systems?,"We propose an experiment, which would allow to pinpoint the role of
+spin-orbit coupling in the metal-nonmetal transition observed in a number of
+two-dimensional systems at low densities. Namely, we demonstrate that in a
+parallel magnetic field the interplay between the spin-orbit coupling and the
+Zeeman splitting leads to a characteristic anisotropy of resistivity with
+respect to the direction of the in-plane magnetic field. Though our analytic
+calculation is done in the deeply insulating regime, the anisotropy is expected
+to persist far beyond that regime.",9904451v2
+2001-07-18,Spin-orbit coupling effects on quantum transport in lateral semiconductor dots,"The effects of interplay between spin-orbit coupling and Zeeman splitting on
+weak localisation and universal conductance fluctuations in lateral
+semiconductor quantum dots are analysed: All possible symmetry classes of
+corresponding random matrix theories are listed and crossovers between them
+achievable by sweeping magnetic field and changing the dot parameters are
+described. We also suggest experiments to measure the spin-orbit coupling
+constants.",0107385v1
+2004-03-06,Luttinger liquid with strong spin-orbital coupling and Zeeman splitting in quantum wires,"We study a one-dimensional interacting electron gas with the strong Rashba
+spin-orbit coupling and Zeeman splitting in a quantum well. A bosonization
+theory is developed for this system. The tunneling current may deviate from a
+simple power law which is that in an ordinary Luttinger liquid. The microscopic
+interacting coupling and the spin-orbital parameter may be measured by varying
+the external magnetic field in the tunneling experiment.",0403183v1
+2005-09-28,Quantum transport phenomena in disordered electron systems with spin-orbit coupling in two dimensions and below,"Electron transport phenomena in disordered electron systems with spin-orbit
+coupling in two dimensions and below are studied numerically. The scaling
+hypothesis is checked by analyzing the scaling of the quasi-1D localization
+length. A logarithmic increase of the mean conductance is also confirmed. These
+support the theoretical prediction that the two dimensional metal in systems
+with spin-orbit coupling has a perfect conductivity. Transport through a
+Sierpinski carpet is also reported.",0509718v1
+2006-01-02,"Crystal field, spin-orbit coupling and magnetism in a ferromagnet YTiO3","Magnetic properties of stechiometric YTiO3 has been calculated within the
+single-ion-based paradigm taking into account the low-symmetry crystal field
+and the intra-atomic spin-orbit coupling of the Ti3+ ion. Despite of the very
+simplified approach the calculations reproduce perfectly the value of the
+magnetic moment and its direction as well as temperature dependence of the
+magnetic susceptibility chi(T). It turns out that the spin-orbit coupling is
+fundamentally important for 3d magnetism and magnetic properties are determined
+by lattice distortions.",0601005v1
+2007-03-02,Topological Force and Torque in Spin-Orbit Coupling System,"The topological force and torque are investigated in the systems with
+spin-orbit coupling. Our results show that the topological force and torque
+appears as a pure relativistic quantum effect in an electromagnetic field. The
+origin of both topological force and torque is the Zitterbewegung effect.
+Considering nonlinear behaviors of spin-orbit coupling, we address possible
+phenomena driven by the topological forces.",0703048v1
+2008-02-18,Spin-orbit coupling and crystal-field splitting in the electronic and optical properties of nitride quantum dots with a wurtzite crystal structure,"We present an $sp^3$ tight-binding model for the calculation of the
+electronic and optical properties of wurtzite semiconductor quantum dots (QDs).
+The tight-binding model takes into account strain, piezoelectricity, spin-orbit
+coupling and crystal-field splitting. Excitonic absorption spectra are
+calculated using the configuration interaction scheme. We study the electronic
+and optical properties of InN/GaN QDs and their dependence on structural
+properties, crystal-field splitting, and spin-orbit coupling.",0802.2436v1
+2010-01-05,Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study,"The superconducting transition temperature, Tc, of the SrTiO3/LaAlO3
+interface was varied by the electric field effect. The anisotropy of the upper
+critical field and the normal state magneto-transport were studied as a
+function of gate voltage. The spin-orbit coupling energy is extracted. This
+tunable energy scale is used to explain the strong gate dependence of the
+mobility and of the anomalous Hall signal observed. The spin-orbit coupling
+energy follows Tc for the electric field range under study.",1001.0781v1
+2011-12-26,Kondo effect in the presence of spin-orbit coupling,"We study the T=0 Kondo physics of a spin-1/2 impurity in a
+non-centrosymmetric metal with spin-orbit interaction. Within a simple
+variational approach we compute ground state properties of the system for an
+{\it arbitrary} form of spin-orbit coupling consistent with the crystal
+symmetry. This coupling produces an unscreened impurity magnetic moment and can
+lead to a significant change of the Kondo energy. We discuss implications of
+this finding both for dilute impurities and for heavy-fermion materials without
+inversion symmetry.",1112.5875v2
+2012-07-22,Condensation transition of ultracold Bose gases with Rashba spin-orbit coupling,"We study the Bose-Einstein condensate phase transition of three-dimensional
+ultracold bosons with isotropic Rashba spin-orbit coupling. Investigating the
+structure of Ginzburg-Landau free energy as a function of the condensate
+density, we show, within the Bogoliubov approximation, that the condensate
+phase transition is first order with a jump in the condensate density. We
+calculate the transition temperature and the jump in the condensate density at
+the transition for large spin-orbit coupling, where the transition temperature
+depends linearly on the density of particles. Finally, we discuss the
+feasibility of producing the phase transition experimentally.",1207.5263v2
+2013-02-24,Mapping trapped atomic gas with spin-orbit coupling to quantum Rabi-like model,"We construct a connection of the ultracold atomic system in a harmonic trap
+with Raman-induced spin-orbit coupling to the quantum Rabi-like model. By
+mapping the trapped atomic system to a Rabi-like model, we can get the exact
+solution of the Rabi-like model following the methods to solve the quantum Rabi
+model. The existence of such a mapping implies that we can study the basic
+model in quantum optics by using trapped atomic gases with spin-orbit coupling.",1302.5933v1
+2013-06-08,A Raman-induced Feshbach resonance in an effectively single-component Fermi gas,"Ultracold gases of interacting spin-orbit coupled fermions are predicted to
+display exotic phenomena such as topological superfluidity and its associated
+Majorana fermions. Here, we experimentally demonstrate a route to
+strongly-interacting single-component atomic Fermi gases by combining an s-wave
+Feshbach resonance (giving strong interactions) and spin-orbit coupling
+(creating an effective p-wave channel). We identify the Feshbach resonance by
+its associated atomic loss feature and show that, in agreement with our
+single-channel scattering model, this feature is preserved and shifted as a
+function of the spin-orbit coupling parameters.",1306.1965v1
+2013-10-16,Superconductivity in non-centrosymmetric LaNiC2,"We present a discussion of superconductivity in non-centrosymmetric
+superconductors with spin-orbit coupling. A general expression for the
+quasiparticle excitation energy is derived. The superconducting states for the
+point group C2v are classified by symmetry in the limit of weak spin-orbit
+coupling. A non-unitary triplet pairing gap function can account for
+observations of broken time-reversal symmetry and nodes in the superconducting
+state of LaNiC2; however such a gap function also has a gapless branch and
+requires vanishing spin-orbit coupling.",1310.4523v1
+2013-10-31,Topological quantum phase transitions and edge states in spin-orbital coupled Fermi gases,"We study the superconducting state in the presence of spin-orbital coupling
+and the Zeeman field. It is found that a phase transition from the
+Fulde-Ferrell-Larkin-Ovchinnikov state to the topological superconducting state
+occurs upon increasing the spin-orbital coupling. The nature of this
+topological phase transition and its critical property are investigated
+numerically. Physical properties of topological superconducting phase are also
+explored. Moreover, the local density of states is calculated, through which
+the topological feature may be tested experimentally.",1310.8562v3
+2013-11-16,Two-dimensional quasi-ideal Fermi gas with Rashba spin-orbit coupling,"We investigate the zero-temperature properties of a quasi-ideal Fermi gas
+with Rashba spin-orbit coupling. We find that the spin-orbit term strongly
+affects the speeds of zero sound and first sound in the Fermi gas, due to the
+presence of a third-order quantum phase transition. In addition, including a 2D
+harmonic confinement we show that also the shape of the density profile of the
+cloud crucially depends on the strength of the Rashba coupling.",1311.4080v3
+2014-01-02,Superfluid-Mott insulator transition in spin-orbit coupled Bose-Hubbard Model,"We consider a square optical lattice in two dimensions and study the effects
+of both the strength and symmetry of spin-orbit-coupling (SOC) and Zeeman field
+on the ground-state, i.e., Mott insulator (MI) and superfluid (SF), phases and
+phase diagram, i.e., MI-SF phase transition boundary, of the two-component
+Bose-Hubbard model. In particular, based on a variational Gutzwiller ansatz,
+our numerical calculations show that the spin-orbit coupled SF phase is a
+nonuniform (twisted) one with its phase (but not the magnitude) of the order
+parameter modulating from site to site. Fully analytical insights into the
+numerical results are also given.",1401.0527v1
+2014-11-09,Spin-orbit Coupling in Optical lattices,"In this review, we discuss the physics of spin-orbit coupled quantum gases in
+optical lattices. After reviewing some relevant experimental techniques, we
+introduce the basic theoretical model and discuss some of its generic features.
+In particular, we concentrate on the interplay between spin-orbit coupling and
+strong interactions and show how it leads to various exotic quantum phases in
+both the Mott insulating and superfluid regimes. Phase transitions between the
+Mott and superfluid states are also discussed.",1411.2297v1
+2014-12-11,Spin-orbit couplings of quantum fields in Schwarzschild spacetime,"In Schwarzschild spacetime, the gravitational spin-orbit couplings of the
+massless Dirac field and the photon field can be studied in a unified way. In
+contrary to the previous investigations presented mainly at the
+quantum-mechanical level, our work is presented at the level of quantum field
+theory without resorting to the Foldy-Wouthuysen transformation. If massless
+Dirac particles and photons have the same momentums, their energy-level
+splittings due to the gravitational spin-orbit couplings are the same. Massless
+Dirac particles and photons coming from the Hawking radiations are partially
+polarized as long as their original momentums are not parallel to the radial
+direction of a Schwarzschild black hole.",1412.3522v1
+2015-08-03,Odd-parity superconductivity in the vicinity of inversion symmetry breaking in spin-orbit-coupled systems,"We study superconductivity in spin-orbit-coupled systems in the vicinity of
+inversion symmetry breaking. We find that due to the presence of spin-orbit
+coupling, fluctuations of the incipient parity-breaking order generate an
+attractive pairing interaction in an odd-parity pairing channel, which competes
+with the s-wave pairing. We show that applying a Zeeman field suppresses the
+s-wave pairing and promotes the odd-parity superconducting state. Our work
+provides a new mechanism for odd-parity pairing and opens a route to novel
+topological superconductivity.",1508.00574v1
+2015-10-01,Dynamics of quantized vortices in Bose-Einstein condensates with laser-induced spin-orbit coupling,"We study vortex dynamics in trapped two-component Bose-Einstein condensates
+with a laser- induced spin-orbit coupling using the numerical analysis of the
+Gross-Pitaevskii equation. The spin-orbit coupling leads to three distinct
+ground state phases, which depend on some experimentally controllable
+parameters. When a vortex is put in one or both of the two-component
+condensates, the vortex dynamics exhibits very different behaviors in each
+phase, which can be observed in experiments. These dynamical behaviors can be
+understood by clarifying the stable vortex structure realized in each phase.",1510.00142v1
+2016-01-26,Electric control of superconducting transition through a spin-orbit coupled interface,"We demonstrate theoretically all-electric control of the superconducting
+transition temperature using a device comprised of a conventional
+superconductor, a ferromagnetic insulator, and semiconducting layers with
+intrinsic spin-orbit coupling. By using analytical calculations and numerical
+simulations, we show that the transition temperature of such a device can be
+controlled by electric gating which alters the ratio of Rashba to Dresselhaus
+spin-orbit coupling. The results offer a new pathway to control
+superconductivity in spintronic devices.",1601.07176v2
+2013-08-26,Emergent Kinetics and Fractionalized Charge in 1D Spin-Orbit Coupled Flatband Optical Lattices,"Recent ultracold atomic gas experiments implementing synthetic spin-orbit
+coupling allow access to flatbands that emphasize interactions. We model
+spin-orbit coupled fermions in a one-dimensional flatband optical lattice. We
+introduce an effective Luttinger-liquid theory to show that interactions
+generate collective excitations with emergent kinetics and fractionalized
+charge, analogous to properties found in the two-dimensional fractional quantum
+Hall regime. Observation of these excitations would provide an important
+platform for exploring exotic quantum states derived solely from interactions.",1308.5601v3
+2011-11-18,Phase Diagram of Two-dimensional Polarized Fermi Gas With Spin-Orbit Coupling,"We investigate the ground state of the two-dimensional polarized Fermi gas
+with spin-orbit coupling and construct the phase diagram at zero temperature.
+We find there exist phase separation when the binding energy is low. As the
+binding energy increasing, the topological nontrivial superfluid phase coexist
+with topologically trivial superfluid phase which is topological phase
+separation. The spin-orbit coupling interaction enhance the triplet pairing and
+destabilize the phase separation against superfluid phase.",1111.4277v1
+2011-11-23,Majorana fermions in carbon nanotubes,"We show that carbon nanotubes (CNT) are good candidates for realizing
+one-dimensional topological superconductivity with Majorana fermions localized
+near the end points. The physics behind topological superconductivity in CNT is
+novel and is mediated by a recently reported curvature-induced spin-orbit
+coupling which itself has a topological origin. In addition to the spin-orbit
+coupling, an important new requirement for a robust topological state is broken
+chirality symmetry about the nanotube axis. We use topological arguments to
+show that, for recently realized strengths of spin-orbit coupling and broken
+chirality symmetry, a robust topological gap of around 500 mK is achievable in
+carbon nanotubes.",1111.5622v1
+2012-01-09,Josephson Current through a Semiconductor Nanowire: effect of strong spin-orbit coupling and Zeeman splitting,"We study coherent transport through a semiconductor nanowire in the presence
+of spin-orbit coupling and Zeeman splitting due to an applied magnetic field.
+By employing analytical and numerical techniques we develop a theory for the
+Josephson effect in the superconductor-semiconductor nanowire-superconductor
+structure. We show that Josephson current through the clean semiconductor
+nanowire exhibits a number of interesting features due to the interplay between
+the Zeeman splitting and spin-orbit coupling. We also study effect how disorder
+in the nanowire affects Andreev bound-state energy spectrum and calculate local
+density of states at the junction.",1201.1918v2
+2012-04-03,Magnetic Impurities in Two-Dimensional Superfluid Fermi Gas with Spin-Orbit Coupling,"We consider magnetic impurities in a two dimensional superfluid Fermi gas in
+the presence of spin-orbit coupling. By using the methods of t-matrix and
+Green's function, we find spin-orbit coupling has some dramatic impacts on the
+effects of magnetic impurities. For the single impurity problem, the number of
+bound states localized around the magnetic impurity is doubled. For the finite
+concentration $n$ of impurities, the energy gap is reduced and the density of
+states in the gapless region is greatly modified.",1204.0571v1
+2014-05-16,Spin-orbit coupled Bose-Einstein condensates in a one-dimensional optical lattice,"The realization of artificial gauge fields and spin-orbit coupling for
+ultra-cold quantum gases promises new insight into paradigm solid state
+systems. Here we experimentally probe the dispersion relation of a spin-orbit
+coupled Bose-Einstein condensate loaded into a translating optical lattice by
+observing its dynamical stability, and develop an effective band structure that
+provides a theoretical understanding of the locations of the band edges. This
+system presents exciting new opportunities for engineering condensed-matter
+analogs using the flexible toolbox of ultra-cold quantum gases.",1405.4048v1
+2015-12-12,Influence of Induced Interactions on Superfluid Properties of Quasi-Two Dimensional Dilute Fermi Gases With Spin-Orbit Coupling,"We study the effects of induced interactions on the pairing gap, transition
+temperature and chemical potential of a quasi-two dimensional Fermi gas of
+atoms with spin-orbit coupling. We find that these mean-field parameters are
+significantly modified when induced interactions are taken into account. We
+also investigate the implications of induced interactions corrections for the
+BCS-BEC crossover driven by spin-orbit coupling, that happens even for small
+(compared to the Fermi energy) values of the binding energy.",1512.03964v1
+2017-07-28,Moving obstacle potential in a spin-orbit-coupled Bose-Einstein condensate,"We investigate the dynamics around an obstacle potential moving in the
+plane-wave state of a pseudospin-$1/2$ Bose-Einstein condensate with Rashba
+spin-orbit coupling. We numerically investigate the dynamics of the system and
+find that it depends not only on the velocity of the obstacle but also
+significantly on the direction of obstacle motion, which are verified by a
+Bogoliubov analysis. The excitation diagram with respect to the velocity and
+direction is obtained. The dependence of the critical velocity on the strength
+of the spin-orbit coupling and the size of the obstacle is also investigated.",1707.09136v1
+2018-10-01,Monoclinic SrIrO$_3$ - A Dirac semimetal produced by non-symmorphic symmetry and spin-orbit coupling,"SrIrO$_3$ crystallizes in a monoclinic structure of distorted hexagonal
+perovskite at ambient pressure. The transport measurements show that the
+monoclinic SrIrO$_3$ is a low-carrier density semimetal, as in the orthorhombic
+perovskite polymorph. The electronic structure calculation indicates a
+semimetallic band structure with Dirac bands at two high-symmetry points of
+Brillouin zone only when spin-orbit coupling is incorporated, suggesting that
+the semimetallic state is produced by the strong spin-orbit coupling. We argue
+that the Dirac bands are protected by the non-symmorphic symmetry of lattice.",1810.00815v1
+2019-09-30,Mixed-parity superconductivity near Lifshitz transitions in strongly spin-orbit-coupled metals,"We consider a strongly spin-orbit-coupled metal, one of whose Fermi surfaces
+is close to a Lifshitz (topological) transition. Via a renormalization group
+analysis of the square-lattice Hubbard model with strong Rashba spin-orbit
+coupling, we show that such a metal is generically unstable to the formation of
+mixed-parity superconductivity with a helical triplet component.",1909.13570v2
+2021-01-25,Effects of spin orbit coupling in superconducting proximity devices -- application to $\mathrm{CoSi_2 / TiSi_2}$ heterostructures,"Motivated by the recent findings of unconventional superconductivity in
+$\mathrm{CoSi_2 / TiSi_2}$ heterostructures, we study the effect of interface
+induced Rashba spin orbit coupling on the conductance of a three terminal ""T""
+shape superconducting device. We calculate the differential conductance for
+this device within the quasi-classical formalism that includes the mixing of
+triplet-singlet pairing due to the Rashba spin orbit coupling. We discuss our
+result in the light of the conductance spectra reported by Chiu {\it et al.}
+for $\mathrm{CoSi_2 / TiSi_2}$ heterostructures.",2101.10197v2
+2017-11-18,Spin-orbit coupling and magnetic field dependence of carriers states in a self-assembled quantum dot,"In this work I investigate the influence of spin-orbit coupling on the
+magnetic field dependence of carrier states in a self-assembled quantum dot. I
+calculate the hole energy levels using the 6, 8 and 14 band k.p model. Through
+a detailed study within these models, I extract the information about the
+impact of various spin-orbital coupling channels in the hole p-shell. I also
+show that complicated magnetic field dependence of the hole p-shell resulting
+from numerical simulations, can be very well fitted using a phenomenological
+model. I compare the electron and hole g-factors calculated within 8 and 14
+band k.p models and show that these methods give reasonably good agreement.",1711.06934v1
+2018-08-16,{\em Zitterbewegung} in Spin-Orbit Coupled Systems and Ehrenfest's Theorem,"We use Ehrenfest's theorem to provide a particularly simple derivation of the
+{\em zitterbewegung} in the dynamics of initial Gaussian wave packets in a
+two-dimensional electron gas. For initial packets which are very wide in the
+$y$-direction, the {\em zitterbewegung} is only in the $y$-component of the
+velocity. We extend our Ehrenfest theorem based calculation to the spin-orbit
+coupled spinor Bose-Einstein condensate (BEC) to predict that there can be {\em
+zitterbewegung} in the $x$-component of the velocity in this situation driven
+by a combination of the nonlinear interaction in the condensate and the
+splitting due to the spin-orbit coupling.",1808.05397v1
+2020-05-25,Visible stripe phases in spin-orbital-angular-momentum coupled Bose-Einstein condensates,"Recently, stripe phases in spin-orbit coupled Bose-Einstein condensates
+(BECs) have attracted much attention since they are identified as supersolid
+phases. In this paper, we exploit experimentally reachable parameters and show
+theoretically that annular stripe phases with large stripe spacing and high
+stripe contrast can be achieved in spin-orbital-angular-momentum coupled
+(SOAMC) BECs. In addition to using Gross-Pitaevskii numerical simulations, we
+develop a variational ansatz that captures the essential interaction effects to
+first order, which are not present in the ansatz employed in previous
+literature. Our work should open the possibility toward directly observing
+stripe phases in SOAMC BECs in experiments.",2005.12007v1
+2021-02-26,Distinctive magnetic properties of CrI3 and CrBr3 monolayers caused by spin-orbit coupling,"After the discovery of magnetism in monolayer CrI3, the magnetic properties
+of different 2D materials from the chromium-trihalide family are intuitively
+assumed to be similar, yielding magnetic anisotropy from the spin-orbit
+coupling on halide ligands. Here we reveal significant differences between the
+CrI3 and CrBr3 magnetic monolayers in their magnetic anisotropy, resulting
+Curie temperature, hysteresis in external magnetic field, and evolution of
+magnetism with strain, all predominantly attributed to distinctly different
+interplay of atomic contributions to spin-orbit coupling in two materials.",2102.13325v1
+2023-11-23,Supercurrent-carrying supersolid in spin-orbit-coupled Bose-Einstein condensates,"One of brilliant achievements in spin-orbit-coupled Bose-Einstein condensates
+is the discovery and observation of the supersolid stripe states. So far, all
+studied supersolid stripe states do not carry supercurrent. In this work, we
+reveal the existence of novel supercurrent-carrying supersolids in
+spin-orbit-coupled Bose-Einstein condensates. The supersolid family has a
+parabolic-like dispersion relation and carries supercurrent which is
+proportional to the quasimomentum. Energetic and dynamical instabilities can
+break supercurrent-carrying ability of this supersolid family. An insightful
+interpretation of the dynamical instability of supercurrent-carrying
+supersolids from the pure plane-wave phase is provided.",2311.13786v1
+2019-07-03,Large spin-relaxation anisotropy in bilayer-graphene/WS$_2$ heterostructures,"We study spin-transport in bilayer-graphene (BLG), spin-orbit coupled to a
+tungsten di sulfide (WS$_2$) substrate, and measure a record spin lifetime
+anisotropy ~40-70, i.e. ratio between the out-of-plane $\tau_{\perp}$ and
+in-plane spin relaxation time $\tau_{||}$. We control the injection and
+detection of in-plane and out-of-plane spins via the shape-anisotropy of the
+ferromagnetic electrodes. We estimate $\tau_{\perp}$ ~ 1-2 ns via Hanle
+measurements at high perpendicular magnetic fields and via a new tool we
+develop: Oblique Spin Valve measurements. Using Hanle spin-precession
+experiments we find a low $\tau_{||}$ ~ 30 ps in the electron-doped regime
+which only weakly depends on the carrier density in the BLG and conductivity of
+the underlying WS$_2$, indicating proximity-induced spin-orbit coupling (SOC)
+in the BLG. Such high $\tau_{\perp}$ and spin lifetime anisotropy are clear
+signatures of strong spin-valley coupling for out-of-plane spins in BLG/WS$_2$
+systems in the presence of SOC, and unlock the potential of BLG/transition
+metal dichalcogenide heterostructures for developing future spintronic
+applications.",1907.01975v1
+2019-07-08,Theory of Spin Injection in Two-dimensional Metals with Proximity-Induced Spin-Orbit Coupling,"Spin injection is a powerful experimental probe into a wealth of
+nonequilibrium spin-dependent phenomena displayed by materials with spin-orbit
+coupling (SOC). Here, we develop a theory of coupled spin-charge diffusive
+transport in two-dimensional spin-valve devices. The theory describes a
+realistic proximity-induced SOC with both spatially uniform and random
+components of the SOC due to adatoms and imperfections, and applies to the two
+dimensional electron gases found in two-dimensional materials and van der Walls
+heterostructures. The various charge-to-spin conversion mechanisms known to be
+present in diffusive metals, including the spin Hall effect and several
+mechanisms contributing current-induced spin polarization are accounted for.
+Our analysis shows that the dominant conversion mechanisms can be discerned by
+analyzing the nonlocal resistance of the spin-valve for different polarizations
+of the injected spins and as a function of the applied in-plane magnetic field.",1907.03727v1
+2023-05-29,Inverse spin-Hall effect and spin-swapping in spin-split superconductors,"When a spin-splitting field is introduced to a thin film superconductor, the
+spin currents polarized along the field couples to energy currents that can
+only decay via inelastic scattering. We study spin and energy injection into
+such a superconductor where spin-orbit impurity scattering yields inverse
+spin-Hall and spin-swapping currents. We show that the combined presence of a
+spin-splitting field, superconductivity, and inelastic scattering gives rise to
+a renormalization of the spin-Hall and spin-swap angles. In addition to an
+enhancement of the ordinary inverse spin-Hall effect, spin-splitting gives rise
+to unique inverse spin-Hall and spin-swapping signals five orders of magnitude
+stronger than the ordinary inverse spin-Hall signal. These can be completely
+controlled by the orientation of the spin-splitting field, resulting in a
+long-range charge and spin accumulations detectable much further from the
+injector than in the normal-state. Our results demonstrate that superconductors
+provide tunable inverse spin-Hall and spin-swapping signals with high detection
+sensitivity.",2305.18525v1
+2023-08-19,Fermi Surface Spin Texture and Topological Superconductivity in Spin-Orbit Free Non-Collinear Antiferromagnets,"We explore the relationship among the magnetic ordering in real space, the
+resulting spin texture on the Fermi surface, and the related superconducting
+gap structure in non-collinear antiferromagnetic metals without spin-orbit
+coupling. Via a perturbative approach, we show that a non-collinear magnetic
+ordering in a metal can generate a momentum-dependent spin texture on its Fermi
+surface, even in the absence of spin-orbit coupling, if the metal has more than
+three sublattices in its magnetic unit cell. Thus, our theory naturally extends
+the idea of altermagnetism to non-collinear spin structures. When
+superconductivity is developed in a magnetic metal, as the gap-opening
+condition is strongly constrained by the spin texture, the nodal structure of
+the superconducting state is also enforced by the magnetism-induced spin
+texture. Taking the non-collinear antiferromagnet on the kagome lattice as a
+representative example, we demonstrate how the Fermi surface spin texture
+induced by noncollinear antiferromagnetism naturally leads to odd-parity
+spin-triplet superconductivity with nontrivial topological properties.",2308.09925v2
+2022-05-05,Spin Manipulation by Giant Valley-Zeeman Spin-Orbit Field in Atom-Thick WSe2,"The phenomenon originating from spin-orbit coupling (SOC) provides
+energy-efficient strategies for spin manipulation and device applications. The
+broken inversion symmetry interface and resulting electric field induce a
+Rashba-type spin-orbit field (SOF), which has been demonstrated to generate
+spin-orbit torque for data storage applications. In this study, we found that
+spin flipping can be achieved by the valley-Zeeman SOF in monolayer WSe2 at
+room temperature, which manifests as a negative magnetoresistance in the
+vertical spin valve. Quantum transmission calculations based on an effective
+model near the K valley of WSe2 confirm the precessional spin transport of
+carriers under the giant SOF, which is estimated to be 650 T. In particular,
+the valley-Zeeman SOF-induced spin dynamics was demonstrated to be tunable with
+the layer number and stacking phase of WSe2 as well as the gate voltage, which
+provides a novel strategy for spin manipulation and can benefit the development
+of ultralow-power spintronic devices.",2205.02876v1
+2004-07-28,Effects of Quantum-Well Inversion Asymmetry on Electron-Nuclear Spin Coupling in the Fractional Quantum Hall Regime,"We examine effects of inversion asymmetry of a GaAs/Al0.3Ga0.7As quantum well
+(QW) on electron-nuclear spin coupling in the fractional quantum Hall (QH)
+regime. Increasing the QW potential asymmetry at a fixed Landau-level filling
+factor (nu) with gate voltages suppresses the current-induced nuclear spin
+polarization in the nu = 2/3 Ising QH ferromagnet, while it significantly
+enhances the nuclear spin relaxation at general nu. These findings suggest that
+mixing of different spin states due to the Rashba spin-orbit interaction
+strongly affects the electron-nuclear spin coupling.",0407729v1
+2008-05-08,Spin-Electric Coupling in Molecular Magnets,"We study the triangular antiferromagnet Cu$_3$ in external electric fields,
+using symmetry group arguments and a Hubbard model approach. We identify a
+spin-electric coupling caused by an interplay between spin exchange, spin-orbit
+interaction, and the chirality of the underlying spin texture of the molecular
+magnet. This coupling allows for the electric control of the spin (qubit)
+states, e.g. by using an STM tip or a microwave cavity. We propose an
+experimental test for identifying molecular magnets exhibiting spin-electric
+effects.",0805.1158v1
+2010-02-26,Bends In Nanotubes Allow Electric Spin Control and Coupling,"We investigate combined effects of spin-orbit coupling and magnetic field in
+carbon nanotubes containing one or more bends along their length. We show how
+bends can be used to provide electrical control of confined spins, while spins
+confined in straight segments remain insensitive to electric fields. Device
+geometries that allow general rotation of single spins are presented and
+analyzed. In addition, capacitive coupling along bends provides coherent
+spin-spin interaction, including between otherwise disconnected nanotubes,
+completing a universal set of one- and two-qubit gates.",1003.0037v2
+2005-05-02,Orbital order in vanadium spinels,"Motivated by recent theoretical and experimental controversy, we present a
+theoretical study to clarify the orbital symmetry of the ground state of
+vanadium spinel oxides AV$_2$O$_4$ (A=Zn, Mg, Cd). The study is based on an
+effective Hamiltonian with spin-orbital superexchange interaction and a local
+spin-orbit coupling term. We construct a classical phase-diagram and prove the
+complex orbital nature of the ground state. Remarkably, with our new analysis
+we predict correctly also the coherent tetragonal flattening of oxygen
+octahedra. Finally, through analytical considerations as well as numerical
+ab-initio simulations, we propose how to detect the predicted complex orbital
+ordering through vanadium K edge resonant x-ray scattering.",0505031v1
+2017-07-13,Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension,"Using the Density Matrix Renormalization Group technique we study the effect
+of spin-orbit coupling on a three-orbital Hubbard model in the $(t_{2g})^{4}$
+sector and in one dimension. Fixing the Hund coupling to a robust value
+compatible with some multiorbital materials, we present the phase diagram
+varying the Hubbard $U$ and spin-orbit coupling $\lambda$, at zero temperature.
+Our results are shown to be qualitatively similar to those recently reported
+using the Dynamical Mean Field Theory in higher dimensions, providing a robust
+basis to approximate many-body techniques. Among many results, we observe an
+interesting transition from an orbital-selective Mott phase to an excitonic
+insulator with increasing $\lambda$ at intermediate $U$. In the strong $U$
+coupling limit, we find a non-magnetic insulator with an effective angular
+momentum $\langle(\textbf{J}^{eff})^{2}\rangle \ne 0$ near the excitonic phase,
+smoothly connected to the $\langle(\textbf{J}^{eff})^{2}\rangle = 0$ regime. We
+also provide a list of quasi-one dimensional materials where the physics
+discussed in this publication could be realized.",1707.04313v1
+2010-09-25,Pulse-pumped double quantum dot with spin-orbit coupling,"We consider the full driven quantum dynamics of a qubit realized as spin of
+electron in a one-dimensional double quantum dot with spin-orbit coupling. The
+driving perturbation is taken in the form of a single half-period pulse of
+electric field. Spin-orbit coupling leads to a nontrivial evolution in the spin
+and charge densities making the dynamics in both quantities irregular. As a
+result, the charge density distribution becomes strongly spin-dependent. The
+transition from the field-induced tunneling to the strong coupling regime is
+clearly seen in the charge and spin channels. These results can be important
+for the understanding of the techniques for the spin manipulation in
+nanostructures.",1009.5013v1
+2014-02-17,Incommensurate spin density wave as a signature of spin-orbit coupling,"Close to half filling and in the limit of strong interactions the Hubbard
+model leads a spin Hamiltonian. In its original isotropic form this is the
+Heisenberg model with antiferromagnetic coupling $J$. On a square lattice there
+is no frustration and the ground state is a classical antiferromagnet denoted
+by the commensurate order vector ${\bf Q}=(\pi,\pi)$. In this work we show that
+the inclusion of spin orbit coupling (SOC) in the fermionic Hubbard model on a
+square lattice leads to an incommensurate spin density wave (ISDW) in the
+strong interactions limit at half filling. In this limit the Hubbard model
+leads to a non-diagonal and anisotropic spin Hamiltonian which exhibits the
+incommensurate spin order as its classical ground state. We note that an ISDW
+can be found in systems regardless of spin orbit-coupling due to nesting and
+lattice distortion. These effects, however, can usually be recognized by
+experimental probes.",1402.4093v1
+2016-11-22,Spin-charge coupling effects in a two-dimensional electron gas,"In these lecture notes we study the disordered two-dimensional electron gas
+in the presence of Rashba spin-orbit coupling, by using the Keldysh
+non-equilibrium Green function technique. We describe the effects of the
+spin-orbit coupling in terms of a SU(2) gauge field and derive a generalized
+Boltzmann equation for the charge and spin distribution functions. We then
+apply the formalism to discuss the spin Hall and the inverse spin galvanic
+(Edelstein) effects. Successively we show how to include, within the
+generalized Boltzmann equation, the side jump, the skew scattering and the spin
+current swapping processes originating from the extrinsic spin-orbit coupling
+due to impurity scattering.",1611.07210v1
+2015-12-10,Quantized one-dimensional edge channels with strong spin-orbit coupling in 3D topological insulators,"A strong coupling between the electron spin and its motion is one of the
+prerequisites of spin-based data storage and electronics. A major obstacle is
+to find spin-orbit coupled materials where the electron spin can be probed and
+manipulated on macroscopic length scales, for instance across the gate channel
+of a spin-transistor. Here, we report on millimeter-scale edge channels with a
+conductance quantized at a single quantum 1 $\times$ $e^2/h$ at zero magnetic
+field. The quantum transport is found at the lateral edges of three-dimensional
+topological insulators made of bismuth chalcogenides. The data are explained by
+a lateral, one-dimensional quantum confinement of non-topological surface
+states with a strong Rashba spin-orbit coupling. This edge transport can be
+switched on and off by an electrostatic field-effect. Our results are
+fundamentally different from an edge transport in quantum spin Hall insulators
+and quantum anomalous Hall insula-tors.",1512.03237v1
+2016-06-14,Spin orbit torque in disordered antiferromagnets,"We investigate the current-induced spin-orbit torque in antiferromangnetic
+materials in the presence of Rashba spin orbit coupling using both the linear
+response theory and the non-equilibrium Green's function technique implemented
+on a tight-binding model. We show that a staggered spin density arises from
+interband contributions. The effect of the disorder is restricted to the
+diminution of the torque magnitude and does not bring any anomalous behavior to
+the dependences of the torque on the spin orbit strength and the exchange
+interaction between the antiferromagnetic local moments and the itinerant
+electrons spins. We prove that the spin orbit torque is robust against the
+application of the disorder compared to the case of the antiferromagnetic
+spin-valve spin transfer torque.",1606.04261v1
+2018-01-29,Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems,"Spin-orbit coupling in inversion-asymmetric magnetic crystals and structures
+has emerged as a powerful tool to generate complex magnetic textures,
+interconvert charge and spin under applied current, and control magnetization
+dynamics. Current-induced spin-orbit torques mediate the transfer of angular
+momentum from the lattice to the spin system, leading to sustained magnetic
+oscillations or switching of ferromagnetic as well as antiferromagnetic
+structures. The manipulation of magnetic order, domain walls and skyrmions by
+spin-orbit torques provides evidence of the microscopic interactions between
+charge and spin in a variety of materials and opens novel strategies to design
+spintronic devices with potentially high impact in data storage, nonvolatile
+logic, and magnonic applications. This paper reviews recent progress in the
+field of spin-orbitronics, focusing on theoretical models, material properties,
+and experimental results obtained on bulk noncentrosymmetric conductors and
+multilayer heterostructures, including metals, semiconductors, and topological
+insulator systems. Relevant aspects for improving the understanding and
+optimizing the efficiency of nonequilibrium spin-orbit phenomena in future
+nanoscale devices are also discussed.",1801.09636v2
+2017-06-15,Ballistic spin transport in the presence of interfaces with strong spin-orbit coupling,"The inversion symmetry breaking at the interface between different materials
+generates a strong interfacial spin-orbit coupling (ISOC) that may influence
+the spin and charge transport in hybrid structures. Here we use a simple
+analytically solvable model to study in the ballistic approximation various
+spin transport phenomena induced by ISOC in a bilayer metallic system. In this
+model a non-equilibrium steady state carrying a spin current is created by
+applying a spin dependent bias across the metallic junction. Physical
+observables are then calculated using the scattering matrix approach. In
+particular we calculate the absorption of the spin current at the interface
+(the interface spin-loss) and study the interface spin-to-charge conversion.
+The latter consists of an in-plane interface charge current generated by the
+spin dependent bias applied to the junction, which can be viewed as a spin
+galvanic effect mediated by ISOC. Finally we demonstrate that ISOC leads to an
+interfacial spin current swapping, that is, the ""primary"" spin current flowing
+through the spin-orbit active interface is necessarily accompanied with a
+""secondary' swapped spin current flowing along the interface and polarized in
+the direction perpendicular to that of the ""primary"" current. Using the exact
+spin continuity equation we relate the swapping effect to the intefacial
+spin-loss, and argue that this effect is generic and independent on the
+ballistic approximation used for specific calculations.",1706.04797v1
+2001-08-23,Filtering spin with tunnel-coupled electron wave guides,"We show how momentum-resolved tunneling between parallel electron wave guides
+can be used to observe and exploit lifting of spin degeneracy due to Rashba
+spin-orbit coupling. A device is proposed that achieves spin filtering without
+using ferromagnets or the Zeeman effect.",0108373v2
+1997-04-14,Dynamics of PSR J0045-7319/B-star Binary and Neutron Star Formation,"Recent timing observations have revealed the presence of orbital precession
+due to spin-orbit coupling and rapid orbital decay due to dynamical tidal
+interaction in the PSR J0045-7319/B-star binary system. They can be used to put
+concrete constraints on the age, initial spin and velocity of the neutron star.",9704134v1
+2001-08-06,Cancellation of Spin-Orbit Effects in Quantum Gates Based on the Exchange Coupling in Quantum Dots,"We study the effect of the spin-orbit interaction on quantum gate operations
+based on the spin exchange coupling where the qubit is represented by the
+electron spin in a quantum dot or a similar nanostructure. Our main result is
+the exact cancellation of the spin-orbit effects in the sequence producing the
+quantum XOR gate for the ideal case where the pulse shapes of the exchange and
+spin-orbit interactions are identical. For the non-ideal case, the two pulse
+shapes can be made almost identical and the gate error is strongly suppressed
+by two small parameters, the spin-orbit constant and the deviation of the two
+pulse shapes. We show that the dipole-dipole interaction leads only to very
+small errors in the XOR gate.",0108101v2
+2019-09-16,"Spin-orbit coupling in the hydrogen atom, the Thomas precession, and the exact solution of Dirac's equation","Bohr's model of the hydrogen atom can be extended to account for the observed
+spin-orbit interaction, either with the introduction of the Thomas precession,
+or with the stipulation that, during a spin-flip transition, the orbital radius
+remains intact. In other words, if there is a desire to extend Bohr's model to
+accommodate the spin of the electron, then experimental observations mandate
+the existence of the Thomas precession, which is a questionable hypothesis, or
+the existence of artificially robust orbits during spin-flip transitions. This
+is tantamount to admitting that Bohr's model, which is a poor man's way of
+understanding the hydrogen atom, is of limited value, and that one should
+really rely on Dirac's equation for the physical meaning of spin, for the
+mechanism that gives rise to the gyromagnetic coefficient g=2, for Zeeman
+splitting, for relativistic corrections to Schr\""odinger's equation, for
+Darwin's term, and for the correct 1/2 factor in the spin-orbit coupling
+energy.",1909.07333v1
+2004-09-21,Spin Frustration and Orbital Order in Vanadium Spinels,"We present the results of our theoretical study on the effects of geometrical
+frustration and the interplay between spin and orbital degrees of freedom in
+vanadium spinel oxides $A$V$_2$O$_4$ ($A$ = Zn, Mg or Cd). Introducing an
+effective spin-orbital-lattice coupled model in the strong correlation limit
+and performing Monte Carlo simulation for the model, we propose a reduced spin
+Hamiltonian in the orbital ordered phase to capture the stabilization mechanism
+of the antiferromagnetic order. Orbital order drastically reduces spin
+frustration by introducing spatial anisotropy in the spin exchange
+interactions, and the reduced spin model can be regarded as weakly-coupled
+one-dimensional antiferromagnetic chains. The critical exponent estimated by
+finite-size scaling analysis shows that the magnetic transition belongs to the
+three-dimensional Heisenberg universality class. Frustration remaining in the
+mean-field level is reduced by thermal fluctuations to stabilize a collinear
+ordering.",0409526v1
+2013-12-18,Spin-Orbit Qubit on a Multiferroic Insulator in a Superconducting Resonator,"We propose a spin-orbit qubit in a nanowire quantum dot on the surface of a
+multiferroic insulator with a cycloidal spiral magnetic order. The spiral
+exchange field from the multiferroic insulator causes an inhomogeneous
+Zeeman-like interaction on the electron spin in the quantum dot, producing a
+spin-orbit qubit. The absence of an external magnetic field benefits the
+integration of such spin-orbit qubit into high-quality superconducting
+resonators. By exploiting the Rashba spin-orbit coupling in the quantum dot via
+a gate voltage, one can obtain an effective spin-photon coupling with an
+efficient on/off switching. This makes the proposed device controllable and
+promising for hybrid quantum communications.",1312.5159v2
+2014-01-06,The empirical Monod-Beuneu relation of spin-relaxation revisited for elemental metals,"Monod and Beuneu [Monod and Beuneu, Phys. Rev. B 19, 911 (1979)] established
+the validity of the Elliott-Yafet theory for elemental metals through
+correlating the experimental electron spin resonance line-width with the
+so-called spin-orbit admixture coefficients and the momentum-relaxation theory.
+The spin-orbit admixture coefficients data were based on atomic spin-orbit
+splitting. We highlight two shortcomings of the previous description: i) the
+momentum-relaxation involves the Debye temperature and the electron-phonon
+coupling whose variation among the elemental metals was neglected, ii) the
+Elliott-Yafet theory involves matrix elements of the spin-orbit coupling (SOC),
+which are however not identical to the SOC induced energy splitting of the
+atomic levels, even though the two have similar magnitudes. We obtain the
+empirical spin-orbit admixture parameters for the alkali metals by considering
+the proper description of the momentum relaxation theory. In addition, we
+present a model calculation which highlights the difference between the SOC
+matrix element and energy splitting.",1401.1048v1
+2017-10-19,DNA mechanical deformations and chiral spin selectivity,"The strength of the spin-orbit interaction relevant to transport in a low
+dimensional structure depends critically on the relative geometrical
+arrangement of current carrying orbitals. Recent tight-binding orbital models
+for spin transport in DNA-like molecules, have surmised that the band
+spin-orbit coupling arises from the particular angular relations between
+orbitals of neighboring bases on the helical chain. Such arrangement could be
+probed by inducing deformations in the molecule in a conductive probe AFM type
+setup, as it was recently reported by Kiran, Cohen and Naaman\cite{Kiran}. Here
+we report deformation dependent spin selectivity when a double strand DNA model
+is compressed or stretched. We find that the equilibrium geometry is not
+optimal with respect to the SO coupling strength and thus spin selectivity can
+be tuned by deformations. The latter can be increased by stretching the helical
+structure taking into account its elastic properties through the Poisson ratio.
+The spin filtering gap is also found to be tunable with uniaxial deformations.",1710.07204v1
+2010-11-08,Rapidly fluctuating orbital occupancy above the orbital ordering transition in spin-gap compounds,"Several spin systems with low dimensionality develop a spin-dimer phase
+within a molecular orbital below TS, competing with long-range
+antiferromagnetic order. Very often, preferential orbital occupancy and
+ordering are the actual driving force for dimerization, as in the so-called
+orbitally-driven spin-Peierls compounds (MgTi2O4, CuIr2S4, La4Ru2O10,
+NaTiSi2O6, etc.). Through a microscopic analysis of the thermal conductivity k
+(T) in La4Ru2O10, we show that the orbital occupancy fluctuates rapidly above
+TS, resulting in an orbital-liquid state. The strong orbital-lattice coupling
+introduces dynamic bond-length fluctuations that scatter the phonons to produce
+a k (T) proportional to T (i.e. glass-like) above TS. This phonon-glass to
+phonon-crystal transition is shown to occur in other spin-dimer systems, like
+NaTiSi2O6, pointing to a general phenomenon.",1011.1860v1
+2015-07-30,Orbital ordering of Ir-t2g states in the double perovskite Sr2CeIrO6,"The electronic and magnetic properties of monoclinic double perovskite
+Sr$_2$CeIrO$_6$ were examined based on both experiments and first-principles
+density functional theory calculations. From the calculations we conclude that
+low-spin-state Ir$^{4+}$ (5$\textit{d}^5$, S=$\frac{1}{2}$) shows t$_{2g}$ band
+derived anti-ferro type orbital ordering implying alternating occupations of
+$\textit{d}_{yz}$ and $\textit{d}_{xz}$ orbitals at the two symmetrically
+independent Ir sites. The experimentally determined Jahn-Teller type distorted
+monoclinic structure is consistent with the proposed orbital ordering picture.
+Surprisingly, the Ir-5$\textit{d}$ orbital magnetic moment was found to be
+$\approx$ 1.3 times larger than the spin magnetic moment. The experimentally
+observed AFM-insulating states are consistent with the calculations. Both
+electron-electron correlation and spin-orbit coupling (SOC) are required to
+drive the experimentally observed AFM-insulating ground state. This single
+active site double perovskite provides a rare platform with a prototype
+geometrically frustrated fcc lattice where among the different degrees of
+freedom (i.e spin, orbital, and lattice), spin-orbit interaction and Coulomb
+correlation energy scales compete and interact with each other.",1507.08682v1
+2008-06-04,Symmetry of superconducting states with two orbitals on a tetragonal lattice: application to $LaO_{1-x}F_{x}FeAs$,"We use group theory to classify the superconducting states of systems with
+two orbitals on a tetragonal lattice. The orbital part of the superconducting
+gap function can be either symmetric or anti-symmetric. For the orbital
+symmetric state, the parity is even for spin singlet and odd for spin triplet;
+for the orbital anti-symmetric state, the parity is odd for spin singlet and
+even for spin triplet. The gap basis functions are obtained with the use of the
+group chain scheme by taking into account the spin-orbit coupling. In the weak
+pairing limit, the orbital anti-symmetric state is only stable for the
+degenerate orbitals. Possible application to iron-based superconductivity is
+discussed.",0806.0712v3
+2017-12-31,Spinful Aubry-Andre model in a magnetic field: Delocalization facilitated by a weak spin-orbit coupling,"We have incorporated spin-orbit coupling into the Aubry-Andre model of
+tight-binding electron motion in the presence of periodic potential with a
+period incommensurate with lattice constant. This model is known to exhibit an
+insulator-metal transition upon increasing the hopping amplitude. Without
+external magnetic field, spin-orbit coupling leads to a simple renormalization
+of the hopping amplitude. However, when the degeneracy of the on-site energies
+is lifted by an external magnetic field, the interplay of Zeeman splitting and
+spin-orbit coupling has a strong effect on the localization length. We studied
+this interplay numerically by calculating the energy dependence of the Lyapunov
+exponent in the insulating regime. Numerical results can be unambiguously
+interpreted in the language of the phase-space trajectories. As a first step,
+we have explained the plateau in the energy dependence of the localization
+length in the original Aubry-Andre model. Our main finding is that a very weak
+spin-orbit coupling leads to delocalization of states with energies smaller
+than the Zeeman shift. The origin of the effect is the spin-orbit-induced
+opening of new transport channels. We have also found that restructuring of the
+phase-space trajectories, which takes place at certain energies in the
+insulating regime, causes a singularity in the energy dependence of the
+localization length.",1801.00305v1
+2020-09-21,Reversible engineering the spin-orbit coupling of monolayer MoS2 via laser irradiation under controlled gas atmospheres,"Monolayer transition metal dichalcogenides (TMDs) with strong spin-orbit
+coupling combined with broken inversion symmetry, leading to a coupling of spin
+and valley degrees of freedom, make these materials highly interesting for
+potential spintronics and valleytronic applications. However, engineering the
+spin-orbit coupling (SOC) at room temperature as demand after device
+fabrication is still a great challenge for their practical applications. Here
+we reversibly engineer the spin-orbit coupling of monolayer MoS2 by laser
+irradiation under controlled gas environments, where the spin-orbit splitting
+has been effectively regulated within 120 meV to 200 meV. Furthermore, the
+photoluminescence (PL) intensity of B exciton can be invertible manipulation
+over 2 orders of magnitude. We attribute the engineering of spin-orbit
+splitting to the reduction of binding energy combined with band
+renormalization, originating from the enhanced absorption coefficient of
+monolayer MoS2 under inert gases and subsequent the significantly boosted
+carrier concentrations. Reflectance contrast spectra during the engineering
+stage provide unambiguous proof to support our interpretation. Our approach
+offers a new avenue to actively control the SOC strength in TMDs materials at
+room temperature and paves the way for designing innovative spintronics
+devices.",2009.09565v2
+2004-08-05,Spin Dynamics and Spin Transport,"Spin-orbit (SO) interaction critically influences electron spin dynamics and
+spin transport in bulk semiconductors and semiconductor microstructures. This
+interaction couples electron spin to dc and ac electric fields. Spin coupling
+to ac electric fields allows efficient spin manipulating by the electric
+component of electromagnetic field through the electric dipole spin resonance
+(EDSR) mechanism. Usually, it is much more efficient than the magnetic
+manipulation due to a larger coupling constant and the easier access to spins
+at a nanometer scale. The dependence of the EDSR intensity on the magnetic
+field direction allows measuring the relative strengths of the competing SO
+coupling mechanisms in quantum wells. Spin coupling to an in-plane electric
+field is much stronger than to a perpendicular field. Because electron bands in
+microstructures are spin split by SO interaction, electron spin is not
+conserved and spin transport in them is controlled by a number of competing
+parameters, hence, it is rather nontrivial. The relation between spin
+transport, spin currents, and spin populations is critically discussed.
+Importance of transients and sharp gradients for generating spin magnetization
+by electric fields and for ballistic spin transport is clarified.",0408119v1
+2005-06-23,Imaging mesoscopic spin Hall flow: Spatial distribution of local spin currents and spin densities in and out of multiterminal spin-orbit coupled semiconductor nanostructures,"We introduce the concept of bond spin current, which describes the spin
+transport between two sites of the lattice model of a multiterminal spin-orbit
+(SO) coupled semiconductor nanostructure, and express it in terms of the
+spin-dependent nonequilibrium (Landauer-Keldysh) Green functions of the device.
+This formalism is applied to obtain the spatial distribution of microscopic
+spin currents in {\em clean} phase-coherent two-dimensional electron gas with
+the Rashba-type of SO coupling attached to four external leads. Together with
+the corresponding profiles of the stationary spin density, such visualization
+of the phase-coherent spin flow allow us to resolve several key issues for the
+understanding of mechanisms which generate pure spin Hall currents in the
+transverse leads of ballistic devices due to the flow of unpolarized charge
+current through their longitudinal leads. The local spin current profiles
+crucially depend on whether the sample is smaller or greater than the spin
+precession length, thereby demonstrating its essential role as the
+characteristic mesoscale for the spin Hall effect in ballistic multiterminal
+semiconductor nanostructures. Although static spin-independent disorder reduces
+the magnitude of the total spin current in the leads, the bond spin currents
+continue to flow through the whole diffusive 2DEG sample, without being
+localized as edge spin currents around any of its boundaries.",0506588v1
+2010-01-25,Spin relaxation due to deflection coupling in nanotube quantum dots,"We consider relaxation of an electron spin in a nanotube quantum dot due to
+its coupling to flexural phonon modes, and identify a new spin-orbit mediated
+coupling between the nanotube deflection and the electron spin. This mechanism
+dominates other spin relaxation mechanisms in the limit of small energy
+transfers. Due to the quadratic dispersion law of long wavelength flexons,
+$\omega \propto q^2$, the density of states $dq/d\omega \propto \omega^{-1/2}$
+diverges as $\omega \to 0$. Furthermore, because here the spin couples directly
+to the nanotube deflection, there is an additional enhancement by a factor of
+$1/q$ compared to the deformation potential coupling mechanism. We show that
+the deflection coupling robustly gives rise to a minimum in the magnetic field
+dependence of the spin lifetime $T_1$ near an avoided crossing between
+spin-orbit split levels in both the high and low-temperature limits. This
+provides a mechanism that supports the identification of the observed $T_1$
+minimum with an avoided crossing in the single particle spectrum by Churchill
+et al.[Phys. Rev. Lett. {\bf 102}, 166802 (2009)].",1001.4306v2
+2021-08-12,Theory of spin-charge-coupled transport in proximitized graphene: An SO(5) algebraic approach,"Establishing the conditions under which orbital, spin and lattice-pseudospin
+degrees of freedom are mutually coupled in realistic nonequilibrium conditions
+is a major goal in the emergent field of graphene spintronics. Here, we use
+linear-response theory to obtain a unified microscopic description of spin
+dynamics and coupled spin-charge transport in graphene with an
+interface-induced Bychkov-Rashba effect. Our method makes use of an SO(5)
+extension of the familiar inverse-diffuson approach to obtain a quantum kinetic
+equation for the single-particle density matrix that treats spin and pseudospin
+on equal footing and is valid for arbitrary external perturbations. As an
+application of the formalism, we derive a complete set of drift-diffusion
+equations for proximitized graphene with scalar impurities in the presence of
+electric and spin-injection fields which vary slowly in space and time. Our
+approach is amenable to a wide variety of generalizations, including the study
+of coupled spin-charge dynamics in layered materials with strong spin-valley
+coupling and spin-orbit torques in van der Waals heterostructures.",2108.05559v2
+2010-05-14,Conductance oscillations of a spin-orbit stripe with polarized contacts,"We investigate the linear conductance of a stripe of spin-orbit interaction
+in a 2D electron gas; that is, a 2D region of length $\ell$ along the transport
+direction and infinite in the transverse one in which a spin-orbit interaction
+of Rashba type is present. Polarization in the contacts is described by means
+of Zeeman fields. Our model predicts two types of conductance oscillations:
+Ramsauer oscillations in the minority spin transmission, when both spins can
+propagate, and Fano oscillations when only one spin propagates. The latter are
+due to the spin-orbit coupling with quasibound states of the non propagating
+spin. In the case of polarized contacts in antiparallel configuration Fano-like
+oscillations of the conductance are still made possible by the spin orbit
+coupling, even though no spin component is bound by the contacts. To describe
+these behaviors we propose a simplified model based on an ansatz wave function.
+In general, we find that the contribution for vanishing transverse momentum
+dominates and defines the conductance oscillations. Regarding the oscillations
+with Rashba coupling intensity, our model confirms the spin transistor
+behavior, but only for high degrees of polarization. Including a position
+dependent effective mass yields additional oscillations due to the mass jumps
+at the interfaces.",1005.2480v1
+2024-01-27,Challenges and Opportunities in Searching for Rashba-Dresselhaus Materials for Efficient Spin-Charge Interconversion at Room Temperature,"Spintronic logic devices require efficient spin-charge interconversion:
+converting charge current to spin current and spin current to charge current.
+In spin-orbit materials that are regarded as the most promising candidate for
+spintronic logic devices, one mechanism that is responsible for spin-charge
+interconversion is Edelstein and inverse Edelstein effects based on
+spin-momentum locking in materials with Rashba-type spin-orbit coupling. Over
+last decade, there has been rapid progresses for increasing interconversion
+efficiencies due to the Edelstein effect in a few Rashba-Dresselhaus materials
+and topological insulators, making Rashba spin-momentum locking a promising
+technological solution for spin-orbit logic devices. However, despite the rapid
+progress that leads to high spin-charge interconversion efficiency at cryogenic
+temperatures, the room-temperature efficiency needed for technological
+applications is still low. This paper presents our understanding on the
+challenges and opportunities in searching for Rashba-Dresselhaus materials for
+efficient spin-charge interconversion at room temperature by focusing on
+materials properties such as Rashba coefficients, momentum relaxation times,
+spin-momentum locking relations and electrical conductivities.",2401.15524v1
+2009-03-26,Emergence of the persistent spin helix in semiconductor quantum wells,"According to Noethers theorem, for every symmetry in nature there is a
+corresponding conservation law. For example, invariance with respect to spatial
+translation corresponds to conservation of momentum. In another well-known
+example, invariance with respect to rotation of the electrons spin, or SU(2)
+symmetry, leads to conservation of spin polarization. For electrons in a solid,
+this symmetry is ordinarily broken by spin-orbit coupling, allowing spin
+angular momentum to flow to orbital angular momentum. However, it has recently
+been predicted that SU(2) can be achieved in a two-dimensional electron gas,
+despite the presence of spin-orbit coupling. The corresponding conserved
+quantities include the amplitude and phase of a helical spin density wave
+termed the persistent spin helix. SU(2) is realized, in principle, when the
+strength of two dominant spin-orbit interactions, the Rashba (strength
+parameterized by \alpha) and linear Dresselhaus (\beta_1), are equal. This
+symmetry is predicted to be robust against all forms of spin-independent
+scattering, including electron-electron interactions, but is broken by the
+cubic Dresselhaus term (\beta_3) and spin-dependent scattering. When these
+terms are negligible, the distance over which spin information can propagate is
+predicted to diverge as \alpha approaches \beta_1. Here we observe
+experimentally the emergence of the persistent spin helix in GaAs quantum wells
+by independently tuning \alpha and \beta_1. Using transient spin-grating
+spectroscopy, we find a spin-lifetime enhancement of two orders of magnitude
+near the symmetry point.........",0903.4709v2
+2023-10-05,Intervalley coherence and intrinsic spin-orbit coupling in rhombohedral trilayer graphene,"Rhombohedral graphene multilayers provide a clean and highly reproducible
+platform to explore the emergence of superconductivity and magnetism in a
+strongly interacting electron system. Here, we use electronic compressibility
+and local magnetometry to explore the phase diagram of this material class in
+unprecedented detail. We focus on rhombohedral trilayer in the quarter metal
+regime, where the electronic ground state is characterized by the occupation of
+a single spin and valley isospin flavor. Our measurements reveal a subtle
+competition between valley imbalanced (VI) orbital ferromagnets and intervalley
+coherent (IVC) states in which electron wave functions in the two momentum
+space valleys develop a macroscopically coherent relative phase. Contrasting
+the in-plane spin susceptibility of the IVC and VI phases reveals the influence
+of graphene's intrinsic spin-orbit coupling, which drives the emergence of a
+distinct correlated phase with hybrid VI and IVC character. Spin-orbit also
+suppresses the in-plane magnetic susceptibility of the VI phase, which allows
+us to extract the spin-orbit coupling strength of $\lambda \approx 50\mu$eV for
+our hexagonal boron nitride-encapsulated graphene system. We discuss the
+implications of finite spin-orbit coupling on the spin-triplet superconductors
+observed in both rhombohedral and twisted graphene multilayers.",2310.03781v2
+2022-04-25,Active orbital degree of freedom and potential spin-orbit-entangled moments in Kitaev magnet candidate BaCo$_2$(AsO$_4$)$_2$,"Candidate materials for Kitaev spin liquid phase have been intensively
+studied recently because of their potential applications in fault-tolerant
+quantum computing. Although most of the studies on Kitaev spin liquid have been
+done in 4$d$ and 5$d$ based transition metal compounds, recently there has been
+a growing research interest in Co-based quasi-two-dimensional honeycomb
+magnets, such as BaCo$_2$(AsO$_4$)$_2$ because of formation of
+spin-orbit-entangled $J_{\rm eff}$ = 1/2 pseudospin moments at Co$^{2+}$ sites
+and potential realizations of Kitaev-like magnetism therein. Here, we obtain
+high-accuracy crystal and electronic structure of BaCo$_2$(AsO$_4$)$_2$ by
+employing a combined density functional and dynamical mean-field theory
+calculations, which correctly capture the Mott-insulating nature of the target
+system. We show that Co$^{2+}$ ions form a high spin configuration, $S=3/2$,
+with an active $L_{\rm eff}=1$ orbital degree of freedom, in the absence of
+spin-orbit coupling. The size of trigonal distortion within CoO$_6$ octahedra
+is found to be not strong enough to completely quench the orbital degree of
+freedom, so that the presence of spin-orbit coupling can give rise to the
+formation of spin-orbit-entangled moments and the Kitaev exchange interaction.
+Our finding supports recent studies on potential Kitaev magnetism in this
+compound and other Co-based layered honeycomb systems.",2204.11465v2
+2000-03-13,Spin-orbit coupling in interacting quasi-one-dimensional electron systems,"We present a new model for the study of spin-orbit coupling in interacting
+quasi-one-dimensional systems and solve it exactly to find the spectral
+properties of such systems. We show that the combination of spin-orbit coupling
+and electron-electron interactions results in: the replacement of separate spin
+and charge excitations with two new kinds of bosonic mixed-spin-charge
+excitation, and a characteristic modification of the spectral function and
+single-particle density of states. Our results show how manipulation of the
+spin-orbit coupling, with external electric fields, can be used for the
+experimental determination of microscopic interaction parameters in quantum
+wires.",0003219v1
+2002-08-08,Random matrix theory for closed quantum dots with weak spin-orbit coupling,"To lowest order in the coupling strength, the spin-orbit coupling in quantum
+dots results in a spin-dependent Aharonov-Bohm flux. This flux decouples the
+spin-up and -down random matrix theory ensembles of the quantum dot. We employ
+this ensemble and find significant changes in the distribution of the Coulomb
+blockade peak height, in particular a decrease of the width of the
+distribution. The puzzling disagreement between standard random matrix theory
+and the experimental distributions by Patel et al. might possibly be attributed
+to these spin-orbit effects.",0208177v2
+2005-08-16,Path-integral Monte Carlo simulations for interacting few-electron quantum dots with spin-orbit coupling,"We develop path-integral Monte Carlo simulations for a parabolic
+two-dimensional (2D) quantum dot containing $N$ interacting electrons in the
+presence of Dresselhaus and/or Rashba spin-orbit couplings. Our method solves
+in a natural way the spin contamination problem and allows for numerically
+exact finite-temperature results at weak spin-orbit coupling. For $N<10$
+electrons, we present data for the addition energy, the particle density, and
+the total spin $S$ in the Wigner molecule regime of strong Coulomb
+interactions. We identify magic numbers at N=3 and N=7 via a peak in the
+addition energy. These magic numbers differ both from weak-interaction and
+classical predictions, and are stable with respect to (weak) spin-orbit
+couplings.",0508375v2
+2006-03-21,Spin-Orbit Mediated Control of Spin Qubits,"We propose to use the spin-orbit interaction as a means to control electron
+spins in quantum dots, enabling both single qubit and two qubit operations.
+Very fast single qubit operations may be achieved by temporarily displacing the
+electrons. For two qubit operations the coupling mechanism is based on a
+combination of the spin-orbit coupling and the mutual long-ranged Coulomb
+interaction. Compared to existing schemes using the exchange coupling, the
+spin-orbit induced coupling is less sensitive to random electrical fluctuations
+in the electrodes defining the quantum dots.",0603559v2
+2004-03-03,Universal Quantum Computation through Control of Spin-Orbit Coupling,"We propose a method for quantum computation which uses control of spin-orbit
+coupling in a linear array of single electron quantum dots. Quantum gates are
+carried out by pulsing the exchange interaction between neighboring electron
+spins, including the anisotropic corrections due to spin-orbit coupling.
+Control over these corrections, even if limited, is sufficient for universal
+quantum computation over qubits encoded into pairs of electron spins. The
+number of voltage pulses required to carry out either single qubit rotations or
+controlled-Not gates scales as the inverse of a dimensionless measure of the
+degree of control of spin-orbit coupling.",0403023v3
+2008-08-19,Spin-density induced by electromagnetic wave in two-dimensional electron gas with both Rashba and Dresselhaus spin-orbit couplings,"We consider the magnetic response of a two-dimensional electron gas (2DEG)
+with both Rashba and Dresselhaus spin-orbit coupling to a microwave excitation.
+We generalize the results of [A. Shnirman and I. Martin, Europhys. Lett. 78,
+27001 (2007).], where pure Rashba coupling was studied. We observe that the
+microwave with the in-plane electric field and the out-of-plane magnetic field
+creates an out-of-plane spin polarization. The effect is more prominent in
+clean systems with resolved spin-orbit-split subbands. Considered as response
+to the microwave magnetic field, the spin-orbit contribution to the
+magnetization far exceeds the usual Zeeman contribution in the clean limit. The
+effect vanishes when the Rashba and the Dresselhaus couplings have equal
+strength.",0808.2607v2
+2009-08-07,Spin-orbit coupling and semiclassical electron dynamics in noncentrosymmetric metals,"Spin-orbit coupling of electrons with the crystal lattice plays a crucial
+role in materials without inversion symmetry, lifting spin degeneracy of the
+Bloch states and endowing the resulting nondegenerate bands with complex spin
+textures and topologically nontrivial wavefunctions. We present a detailed
+symmetry-based analysis of the spin-orbit coupling and the band degeneracies in
+noncentrosymmetric metals. We systematically derive the semiclassical equations
+of motion for fermionic quasiparticles near the Fermi surface, taking into
+account both the spin-orbit coupling and the Zeeman interaction with an applied
+magnetic field. Some of the lowest-order quantum corrections to the equations
+of motions can be expressed in terms of a fictitious ""magnetic field"" in the
+momentum space, which is related to the Berry curvature of the band
+wavefunctions. The band degeneracy points or lines serve as sources of a
+topologically nontrivial Berry curvature. We discuss the observable effects of
+the wavefunction topology, focusing, in particular, on the modifications to the
+Lifshitz-Onsager semiclassical quantization condition and the de Haas-van
+Alphen effect in noncentrosymmetric metals.",0908.1105v1
+2015-03-30,Nonequilibrium dynamics of spin-orbit coupled lattice bosons,"We study the non-equilibrium dynamics of two component bosonic atoms in a
+one-dimensional optical lattice in the presence of spin-orbit coupling. In the
+Mott insulating regime, the two-component bosonic system at unity filling can
+be described by the quantum spin XXZ model. The atoms are initially prepared in
+their lower spin states. The system becomes out of equilibrium by suddenly
+introducing spin-orbit coupling to the atoms. The system shows the relaxation
+and non-stationary dynamics, respectively, in the different interaction
+regimes. We find that the time average of magnetization is useful to
+characterize the many-body dynamics. The effects of even and odd numbers of
+sites are discussed. Our result sheds light on non-equilibrium dynamics due to
+the interplay between spin-orbit coupling and atomic interactions.",1503.08605v2
+2011-11-28,Vortex line in spin-orbit coupled atomic Fermi gases,"It has recently been shown that the spin-orbit coupling gives rise to
+topologically-nontrivial and thermodynamically-stable gapless superfluid phases
+when the pseudo-spin populations of an atomic Fermi gas is imbalanced, with the
+possibility of featuring Majorana zero-energy quasiparticles. In this paper, we
+consider a Rashba-type spin-orbit coupling, and use the Bogoliubov-de Gennes
+formalism to analyze a single vortex line along a finite cylinder with a
+periodic boundary condition. We show that the signatures for the appearance of
+core- and edge-bound states can be directly found in the density of
+single-particle states and particle-current density. In particular, we find
+that the pseudo-spin components counterflow near the edge of the cylinder, the
+strength of which increases with increasing spin-orbit coupling.",1111.6450v2
+2014-05-16,Topological phases in spin-orbit coupled dipolar lattice bosons,"We study the topological phases in spin-orbit coupled dipolar bosons in a
+one-dimensional optical lattice. The magnetic dipolar interactions between
+atoms give rise to the inter-site interactions. In the Mott-insulating regime,
+this system can be described by the quantum XYZ spin model with the
+Dzyaloshinskii-Moriya interactions in a transverse field. We focus on
+investigating the effect of dipolar interactions on the topological phase. The
+topological phase can be shown when spin-orbit coupling incorporates with the
+repulsive dipolar interaction. We find that the dipolar interaction can broaden
+the range of parameters of spin-orbit coupling and transverse field for
+exhibiting the topological phase. The sum of spin correlations between the two
+nearest neighbouring atoms can be used to indicate the topological phase. This
+may be useful for detecting topological phases in experiments.",1405.4068v3
+2016-12-02,Fourier transform spectroscopy of a spin-orbit coupled Bose gas,"We describe a Fourier transform spectroscopy technique for directly measuring
+band structures, and apply it to a spin-1 spin-orbit coupled Bose-Einstein
+condensate. In our technique, we suddenly change the Hamiltonian of the system
+by adding a spin-orbit coupling interaction and measure populations in
+different spin states during the subsequent unitary evolution. We then
+reconstruct the spin and momentum resolved spectrum from the peak frequencies
+of the Fourier transformed populations. In addition, by periodically modulating
+the Hamiltonian, we tune the spin-orbit coupling strength and use our
+spectroscopy technique to probe the resulting dispersion relation. The
+frequency resolution of our method is limited only by the coherent evolution
+timescale of the Hamiltonian and can otherwise be applied to any system, for
+example, to measure the band structure of atoms in optical lattice potentials.",1612.00819v1
+2021-12-21,Quasiclassical boundary conditions for spin-orbit coupled interfaces with spin-charge conversion,"The quasiclassical theory of superconductivity provides a methodology to
+study emergent phenomena in hybrid structures comprised of superconductors
+interfaced with other materials. A key component in this theory is the boundary
+condition that the Green functions describing the materials must satisfy.
+Recently, progress has been made toward formulating such a boundary condition
+for interfaces with spin-orbit coupling, the latter playing an important role
+for several phenomena in spintronics. Here, we derive a boundary condition for
+spin-orbit coupled interfaces that includes gradient terms which enables the
+description of spin-Hall like effects with superconductors due to such
+interfaces. As an example, we show that the boundary conditions predict that a
+supercurrent flowing through a superconductor that is coupled to a normal metal
+via a spin-orbit interface can induce a non-local magnetization in the normal
+metal.",2112.11469v2
+2022-08-10,Collective spin modes in Fermi liquids with spin-orbit coupling,"A combination of spin-orbit coupling and electron-electron interaction gives
+rise to a new type of collective spin modes, which correspond to oscillations
+of magnetization even in the absence of the external magnetic field. We review
+recent progress in theoretical understanding and experimental observation of
+such modes, focusing on three examples of real-life systems: a two-dimensional
+electron gas with Rashba and/or Dresselhaus spin-orbit coupling, graphene with
+proximity-induced spin-orbit coupling, and the Dirac state on the surface of a
+three-dimensional topological insulator. This paper is dedicated to the 95th
+birthday of Professor Emmanuel I. Rashba.",2208.05123v2
+2022-12-11,Effects of spin orbit coupling on proximity induced superconductivity,"We investigate the effect of spin orbit coupling on proximity induced
+superconductivity in a normal metal attached to a superconductor. Specifically,
+we consider a heterostructure where the presence of interfaces gives rise to a
+Rashba spin orbit coupling. The properties of the induced superconductivity in
+these systems are addressed within the tunneling Hamiltonian formalism. We find
+that the spin orbit coupling induces a mixture of singlet and triplet pairing
+and, under specific circumstances, an odd frequency, even parity, spin triplet
+pairs can arise. We also address the effect of impurity scattering on the
+induced pairs, and discuss our results in context of heterostructures
+consisting of materials with spin-momentum locking.",2212.05550v2
+2023-02-23,Flavor symmetry breaking in spin-orbit coupled bilayer graphene,"Recent experimental discovery of flavor symmetry breaking metallic phases in
+Bernal-stacked bilayer graphene points to the strongly interacting nature of
+electrons near the top (bottom) of its valence (conduction) band.
+Superconductivity was also observed in between these symmetry breaking phases
+when the graphene bilayer is placed under a small in-plane magnetic field or in
+close proximity to a monolayer WSe$_2$ substrate. Here we address the
+correlated nature of the band edge electrons and obtain the quantum phase
+diagram of their many-body ground states incorporating the effect of proximity
+induced spin-orbit coupling. We find that in addition to the spin/valley flavor
+polarized half and quarter metallic states, two types of intervalley coherent
+phases emerge near the phase boundaries between the flavor polarized metals.
+Both spin-orbit coupling and in-plane magnetic field disfavor the
+spin-unpolarized valley coherent phase. Our findings suggest possible
+competition between intervalley coherence and superconducting orders, arising
+from the intriguing correlation effects in bilayer graphene in the presence of
+spin-orbit coupling.",2302.12284v3
+2020-04-16,On-Chip Spin-Orbit Controlled Excitation of Quantum Emitters Coupled to Hybrid Plasmonic Nanocircuits,"On-chip realization of complex photonic functionalities is essential for
+further progress in planar integrated nanophotonics, especially when involving
+nonclassical light sources such as quantum emitters (QEs). Hybrid plasmonic
+nanocircuits integrated with QEs have been attracting considerable attention
+due to the prospects of significantly enhancing QE emission rates and
+miniaturizing quantum nanophotonic components. Spin-orbit interactions on
+subwavelength scales have been increasingly explored in both conventional and
+quantum nanophotonics for realization and utilization of the spin-dependent
+flow of light. Here, we propose and realize a dielectric-loaded plasmonic
+nanocircuit consisting of an achiral spin-orbit coupler for unidirectional
+routing of pump radiation into branched QE-integrated waveguides. We
+demonstrate experimentally the circular-polarization controlled coupling of
+532-nm pump laser light into polymer-loaded branched waveguides followed by the
+excitation of spatially separated (by a distance of ~ 10 {\mu}m) QEs,
+nanodiamonds, with multiple nitrogen vacancy centres, that are embedded in and
+efficiently coupled to the corresponding waveguides. The realization of on-chip
+spin-orbit controlled excitation of different QEs coupled to branched
+waveguides opens new avenues for designing complex quantum plasmonic
+nanocircuits exploiting the spin degree of freedom within chiral quantum
+nanophotonics.",2004.07483v1
+2021-11-12,Whirling interlayer fields as a source of stable topological order in moiré CrI3,"The moir\'e engineering of two-dimensional magnets opens unprecedented
+opportunities to design novel magnetic states with promises for spintronic
+device applications. The possibility of stabilizing skyrmions in these
+materials without chiral spin-orbit couplings or dipolar interactions is yet to
+be explored. Here, we investigate the formation and control of ground state
+topological spin textures (TSTs) in moir\'e CrI3 using stochastic
+Landau-Lifshitz-Gilbert simulations. We unveil the emergence of interlayer
+vortex and antivortex Heisenberg exchange fields, stabilizing spontaneous and
+field-assisted ground state TSTs with various topologies. The developed study
+accounts for the full bilayer spin dynamics, thermal fluctuations, and
+intrinsic spin-orbit couplings. By examining the effect of the Kitaev
+interaction and the next nearest-neighbor Dzyaloshinskii-Moriya interaction, we
+propose the latter as the unique spin-orbit coupling mechanism compatible with
+experiments on monolayer and twisted CrI3. Our findings contribute to the
+current knowledge about moir\'e skyrmionics and uncover the nature of
+spin-orbit coupling in CrI3.",2111.06936v2
+2023-09-15,Charge pumping with strong spin-orbit coupling: Fermi surface breathing and higher harmonic generation,"Spin and charge pumping induced by a precessing magnetization has been
+instrumental to the development of spintronics. Nonetheless, most theoretical
+studies so far treat the spin-orbit coupling as a perturbation, which
+disregards the dynamical competition between exchange and spin-orbit fields. In
+this work, based on Keldysh formalism and Wigner expansion, we develop an
+adiabatic theory of spin and charge pumping adapted to multiorbital systems
+with arbitrary spin-orbit coupling. We apply this theory to the magnetic Rashba
+gas and magnetic graphene cases and discuss the pumped ac and dc current. We
+show that the pumped current possesses both intrinsic and extrinsic
+contributions, akin to the magnetic damping. In addition, we find that higher
+harmonics can be generated under large angle precession and we propose a couple
+of experimental setups where such an effect could be experimentally observed.",2309.08597v1
+2020-10-23,Maximizing spin-orbit torque efficiency of Ta(O)/Py via modulating oxygen-induced interface orbital hybridization,"Spin-orbit torques due to interfacial Rashba and spin Hall effects have been
+widely considered as a potentially more efficient approach than the
+conventional spin-transfer torque to control the magnetization of ferromagnets.
+We report a comprehensive study of spin-orbit torque efficiency in
+Ta(O)/Ni81Fe19 bilayers by tuning low-oxidation of \b{eta}-phase tantalum, and
+find that the spin Hall angle {\theta}DL increases from ~ -0.18 of the pure
+Ta/Py to the maximum value ~ -0.30 of Ta(O)/Py with 7.8% oxidation.
+Furthermore, we distinguish the efficiency of the spin-orbit torque generated
+by the bulk spin Hall effect and by interfacial Rashba effect, respectively,
+via a series of Py/Cu(0-2 nm)/Ta(O) control experiments. The latter has more
+than twofold enhancement, and even more significant than that of the former at
+the optimum oxidation level. Our results indicate that 65% enhancement of the
+efficiency should be related to the modulation of the interfacial Rashba-like
+spin-orbit torque due to oxygen-induced orbital hybridization cross the
+interface. Our results suggest that the modulation of interfacial coupling via
+oxygen-induced orbital hybridization can be an alternative method to boost the
+change-spin conversion rate.",2010.12253v1
+2021-08-15,Spin susceptibility for orbital-singlet Cooper pair in the three-dimensional Sr$_2$RuO$_4$ superconductor,"We study the spin susceptibility of the orbital-singlet pairings, including
+the spin-triplet/orbital-singlet/$s$-wave $E_g$ representation proposed by Suh
+\textit{et al}., [H.\ G.\ Suh \textit{et al}., Phys.\ Rev.\ Research
+\textbf{2}, 032023 (2020)], for a three-orbital model of superconducting
+Sr$_2$RuO$_4$ in three dimensions. For the pseudospin-singlet states
+represented in the band basis, the spin susceptibility decreases when reducing
+the temperature, irrespective of the direction of the applied magnetic fields,
+even if they are spin-triplet/orbital-singlet pairings in the spin-orbital
+space. However, because the pseudospin-triplet \textbf{d}-vector in the band
+basis is not completely aligned in the $xy$-plane (along $z$-axis) owing to the
+strong atomic spin-orbit coupling, the spin susceptibility for
+spin-singlet/orbital-singlet/odd-parity pairings is reduced around $5$-$10$
+percent with the decrease of the temperature along the $z$ ($x$) axis. We can
+determine the symmetry of the pseudospin structure of the Cooper pair by the
+temperature dependence of the spin susceptibility measured by nuclear magnetic
+resonance experiments. Our obtained results serve as a guide to determine the
+pairing symmetry of Sr$_2$RuO$_4$.",2108.06718v4
+2005-05-09,Spin and orbital degrees of freedom in transition metal oxides and oxide thin films studied by soft x-ray absorption spectroscopy,"The class of transition metal compounds shows an enormous richness of
+physical properties, such as metal-insulator transitions, colossal
+magneto-resistance, super-conductivity, magneto-optics and spin-depend
+transport. It now becomes more and more clear that in order to describe
+transition metal compounds the charge, orbital, spin and lattice degrees of
+freedom should all be taken into account. With the recognition that the local
+orbital occupation plays an important role in many of the transition metal
+compounds there is a need for experimental techniques that can measure the
+orbital occupation. This technique is soft x-ray absorption spectroscopy.
+Within this PhD. Thesis we will illustrate the usefulness of this technique by
+some examples: 1) Magnetic versus crystal-field linear dichroism in NiO thin
+films. 2) The importance of spin-orbit coupling in CoO bulk and CoO thin films.
+3) Aligning spins in anti ferromagneticfilms using antiferromagnets. 4) The
+spin-state puzzle in the cobaltates. 5) Determination of the orbital momentum
+and crystal-field splitting in LaTiO3. 6) Orbital-assisted metal-insulator
+transition in VO2.",0505214v1
+2011-10-03,Phase transitions in spin-orbital models with spin-space anisotropies for iron-pnictides: A study through Monte Carlo simulations,"The common phase diagrams of superconducting iron pnictides show interesting
+material specificities in the structural and magnetic phase transitions. In
+some cases the two transitions are separate and second order, while in others
+they appear to happen concomitantly as a single first order transition. We
+explore these differences using Monte Carlo simulations of a two-dimensional
+Hamiltonian with coupled Heisenberg-spin and Ising-orbital degrees of freedom.
+In this spin-orbital model, the finite-temperature orbital-ordering transition
+results in a tetragonal-to-orthorhombic symmetry reduction and is associated
+with the structural transition in the iron-pnictide materials. With a zero or
+very small spin space anisotropy, the magnetic transition separates from the
+orbital one in temperature, and the orbital transition is found to be in the
+Ising universality class. With increasing anisotropy, the two transitions
+rapidly merge together and tend to become weakly first order. We also study the
+case of a single-ion anisotropy and propose that the preferred spin-orientation
+along the antiferromagnetic direction in these materials is driven by orbital
+order.",1110.0434v2
+2010-06-11,Mott Transition in Multi-Orbital Models for Iron Pnictides,"The bad-metal behavior of the iron pnictides has motivated a theoretical
+description in terms of a proximity to Mott localization. Since the parent
+compounds of the iron pnictides contain an even number of 3d-electrons per Fe,
+it is important to determine whether a Mott transition robustly exists and the
+nature of the possible Mott insulating phases. We address these issues in a
+minimal two-orbital model and a more realistic four-orbital model for the
+parent iron pnictides using a slave-spin approach. In the two-orbital model
+with two electrons per Fe, we identify a transition from metal to Mott
+insulator. The critical coupling, $U_c$, is greatly reduced by the Hund's
+coupling. Depending on the ratio between the inter- and intra-orbital Coulomb
+repulsions, the insulating state can be either a spin-Mott insulator or an
+orbital-Mott insulator. In the four-orbital model with four electrons per Fe,
+we find an orbitally selective metal-to-insulator transition in the case of
+zero Hund's coupling; the transition to a Mott insulator in the $xz$ and $yz$
+orbitals takes place at the same critical coupling as the transition to a band
+insulator in the $xy$ and $x^2-y^2$ orbitals. In the presence of a finite
+Hund's coupling, however, the localization transition is into a spin-Mott
+state.",1006.2337v3
+1995-05-09,SPIN-ORBIT INTERACTION IN NEUTRON STAR/MAIN SEQUENCE BINARIES AND IMPLICATIONS FOR PULSAR TIMING,"The spin-induced quadrupole moment of a rapidly rotating star changes the
+orbital dynamics in a binary system, giving rise to advance (or regression) of
+periastron and precession of the orbital plane. We show that these effects are
+important in the recently discovered radio pulsar/main sequence star binary
+system PSR J0045$-$7319, and can reliably account for the observed peculiar
+timing residuals. Precise measurements of the apsidal motion and orbital plane
+precession can yield valuable information on the internal structure and
+rotation of the star. The detection of orbital precession implies that the spin
+of the companion star is not aligned with the orbital angular momentum, and
+suggests that the supernova gave the pulsar a kick out of the original orbital
+plane. Tidal excitation of g-mode oscillations in the PSR J0045$-$7319 system
+induces an orbital period change of order $|\Delta P_{\rm orb}/P_{\rm orb}|\sim
+10^{-6}$ at each periastron passage, but the secular trend depends on the
+radiative damping time of the g-modes. We also discuss the spin-orbit coupling
+effects for the accreting X-ray pulsars and the other known radio pulsar/main
+sequence binary, PSR B1259$-$63.",9505042v1
+2014-01-18,Von Neumann spin measurements with Rashba fields,"We show that dynamics in spin-orbit coupling field simulates the von Neumann
+measurement of a particle spin. We demonstrate how the measurement influences
+the spin and coordinate evolution of a particle by comparing two examples of
+such a procedure. First example is a simultaneous measurement of spin
+components, $\sigma _{x}$ and $\sigma _{y}$, corresponding to non-commuting
+operators, which cannot be accurately obtained together at a given time instant
+due to the Heisenberg uncertainty ratio. By mapping spin dynamics onto a
+spatial walk such a procedure determines measurement-time averages of $\sigma
+_{x}$ and $\sigma _{y}$, which already can be precisely evaluated in a single
+short-time measurement. The other, qualitatively different, example is the spin
+of a one-dimensional particle in a magnetic field. Here the outcome depends on
+the angle between the spin-orbit coupling and magnetic fields. These results
+can be applied to studies of spin-orbit coupled cold atoms and electrons in
+solids.",1401.4551v1
+2015-04-20,Emergent topological properties in interacting one-dimensional systems with spin-orbit coupling,"We present analysis of a single channel interacting quantum wire problem in
+the presence of spin-orbit interaction. The spin-orbit coupling breaks the
+spin-rotational symmetry from SU(2) to U(1) and breaks inversion symmetry. The
+low-energy theory is then a two band model with a difference of Fermi
+velocities $\delta v$. Using bosonization and a two-loop renormalization group
+procedure we show that electron-electron interactions can open a gap in the
+spin sector of the theory when the interaction strength $U$ is smaller than
+$\delta v$ in appropriate units. For repulsive interactions, the resulting
+strong coupling phase is of the spin-density-wave type. We show that this phase
+has peculiar emergent topological properties. The gapped spin sector behaves as
+a topological insulator, with zero-energy edge modes with fractional spin. On
+the other hand, the charge sector remains critical, meaning the entire system
+is metallic. However, this bulk electron liquid as a whole exhibits properties
+commonly associated with the one-dimensional edge states of two-dimensional
+spin-Hall insulators, in particular, the conduction of $2e^2/h$ is robust
+against nonmagnetic impurities.",1504.05016v2
+2016-04-21,Spin Transport at Interfaces with Spin-Orbit Coupling: Phenomenology,"This paper presents the boundary conditions needed for drift-diffusion models
+to treat interfaces with spin-orbit coupling. Using these boundary conditions
+for heavy metal/ferromagnet bilayers, solutions of the drift-diffusion
+equations agree with solutions of the spin-dependent Boltzmann equation and
+allow for a much simpler interpretation of the results. A key feature of these
+boundary conditions is their ability to capture the role that in-plane electric
+fields have on the generation of spin currents that flow perpendicularly to the
+interface. The generation of these spin currents is a direct consequence of the
+effect of interfacial spin-orbit coupling on interfacial scattering. In heavy
+metal/ferromagnet bilayers, these spin currents provide an important mechanism
+for the creation of damping-like and field-like torques; they also lead to
+possible reinterpretations of experiments in which interfacial contributions to
+spin torques are thought to be suppressed.",1604.06502v2
+2016-10-17,Single-particle theory of persistent spin helices in two-dimensional electron gas: the general approach for quantum wells with different growth direction,"We present a detailed theoretical investigation of persistent spin helices in
+two-dimensional electron systems with spin-orbit coupling. For this purpose we
+consider a single-particle effective mass Hamiltonian with generalized
+linear-in-k spin-orbit coupling term corresponding to a quantum well grown in
+an arbitrary crystallographic direction, and derive the general condition for
+the formation of the persistent spin helix. This condition applied for the
+Hamiltonians describing quantum wells with different growth directions
+indicates the possibility of existence of the persistent spin helix in a wide
+class of 2D systems apart from [001] model with equal Rashba and Dresselhaus
+spin-orbit coupling strengths and the [110] Dresselhaus model. In addition, we
+employ the translation operator formalism for analytical calculation of
+space-resolved spin density and visualization of the persistent spin helix
+patterns.",1610.05251v1
+2016-10-28,Density matrix based time-dependent configuration interaction approach to ultrafast spin-flip dynamics,"Recent developments in attosecond spectroscopy yield access to the correlated
+motion of electrons on their intrinsic time scales. Spin-flip dynamics is
+usually considered in the context of valence electronic states, where
+spin-orbit coupling is weak and processes related to the electron spin are
+usually driven by nuclear motion. However, for core-excited states, where the
+core hole has a nonzero angular momentum, spin-orbit coupling is strong enough
+to drive spin-flips on a much shorter time scale. Using density matrix based
+time-dependent restricted active space configuration interaction including
+spin-orbit coupling, we address an unprecedentedly short spin-crossover for the
+example of L-edge (2p$\rightarrow$3d) excited states of a prototypical Fe(II)
+complex. This process occurs on a time scale, which is faster than that of
+Auger decay ($\sim$4\,fs) treated here explicitly. Modest variations of carrier
+frequency and pulse duration can lead to substantial changes in the spin-state
+yield, suggesting its control by soft X-ray light.",1610.09264v2
+2012-01-26,Anisotropic effects and phonon induced spin relaxation in gate-controlled semiconductor quantum dots,"In this paper, a detailed analysis of anisotropic effects on the phonon
+induced spin relaxation rate in III-V semiconductor quantum dots (QDs) is
+carried out. We show that the accidental degeneracy due to level crossing
+between the first and second excited states of opposite electron spin states in
+both isotropic and anisotropic QDs can be manipulated with the application of
+externally applied gate potentials. In particular, anisotropic gate potentials
+enhance the phonon mediated spin-flip rate and reduce the cusp-like structure
+to lower magnetic fields, in addition to the lower QDs radii in III-V
+semiconductor QDs. In InAs QDs, only the Rashba spin-orbit coupling contributes
+to the phonon induced spin relaxation rate. However, for GaAs QDs, the Rashba
+spin-orbit coupling has a contribution near the accidental degeneracy point and
+the Dresselhaus spin-orbit coupling has a contribution below and above the
+accidental degeneracy point in the manipulation of phonon induced spin
+relaxation rates in QDs.",1201.5549v1
+2013-02-06,Exotic pairing states in a Fermi gas with three-dimensional spin-orbit coupling,"We investigate properties of exotic pairing states in a three-dimensional
+Fermi gas with three-dimensional spin-orbit coupling and an effective Zeeman
+field. The interplay of spin-orbit coupling, effective Zeeman field and pairing
+can lead to first-order phase transitions between different phases, and to
+interesting nodal superfluid states with gapless surfaces in the momentum
+space. We then demonstrate that pairing states with zero center-of-mass
+momentum are unstable against finite center-of-mass momentum
+Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states, with the center-of-mass
+momentum of the pairs opposite to the direction of the effective Zeeman field.
+Unlike conventional FFLO states, these FFLO states are induced by the
+coexistence of spin-orbit coupling and Fermi surface deformation, and have
+intriguing features like first-order transitions between different FFLO states,
+nodal FFLO states with gapless surfaces in momentum space, and exotic fully
+gapped FFLO states. With the recent theoretical proposals for realizing
+three-dimensional spin-orbit coupling in ultracold atom gases, our work is
+helpful for the future experimental studies, and provides valuable information
+for the general understanding of pairing physics in spin-orbit coupled
+fermionic systems.",1302.1303v2
+2019-04-18,Tuning Topological Superconductivity in Phase-Controlled Josephson Junctions with Rashba and Dresselhaus Spin-Orbit Coupling,"Recently, topological superconductors based on Josephson junctions in
+two-dimensional electron gases with strong Rashba spin-orbit coupling have been
+proposed as attractive alternatives to wire-based setups. Here, we elucidate
+how phase-controlled Josephson junctions based on quantum wells with [001]
+growth direction and an arbitrary combination of Rashba and Dresselhaus
+spin-orbit coupling can also host Majorana bound states for a wide range of
+parameters as long as the magnetic field is oriented appropriately. Hence,
+Majorana bound states based on Josephson junctions can appear in a wide class
+of two-dimensional electron gases. We study the effect of spin-orbit coupling,
+the Zeeman energies, and the superconducting phase difference to create a full
+topological phase diagram and find the optimal stability region to observe
+Majorana bound states in narrow junctions. Surprisingly, for equal Rashba and
+Dresselhaus spin-orbit coupling, well localized Majorana bound states can
+appear only for phase differences $\phi\neq\pi$ as the topological gap
+protecting the Majorana bound states vanishes at $\phi=\pi$. Our results show
+that the ratio between Rashba and Dresselhaus spin-orbit coupling or the choice
+of the in-plane crystallographic axis along which the superconducting phase
+bias is applied offer additional tunable knobs to test Majorana bound states in
+these systems. Finally, we discuss signatures of Majorana bound states that
+could be probed experimentally by tunneling conductance measurements at the
+edge of the junction.",1904.08981v2
+2018-07-27,"An Ab Initio Investigation on the Electronic Structure, Defect Energetics, and Magnesium Kinetics in Mg$_3$Bi$_2$","We present a comprehensive ab initio investigation on Mg$_3$Bi$_2$, a
+promising Mg-ion battery anode material with high rate capacity. Through
+combined DFT (PBE, HSE06) and $G_0W_0$ electronic structure calculations, we
+find that Mg$_3$Bi$_2$ is likely to be a small band gap semiconductor.
+  DFT-based defect formation energies indicate that Mg vacancies are likely to
+form in this material, with relativistic spin-orbit coupling significantly
+lowering the defect formation energies. We show that a transition state
+searching methodology based on the hybrid eigenvector-following approach can be
+used effectively to search for the transition states in cases where full
+spin-orbit coupling is included. Mg migration barriers found through this
+hybrid eigenvector-following approach indicate that spin-orbit coupling also
+lowers the migration barrier, decreasing it to a value of 0.34 eV with
+spin-orbit coupling. Finally, recent experimental results on Mg diffusion are
+compared to the DFT results and show good agreement. This work demonstrates
+that vacancy defects and the inclusion of relativistic spin-orbit coupling in
+the calculations have a profound effect in Mg diffusion in this material. It
+also sheds light on the importance of relativistic spin-orbit coupling in
+studying similar battery systems where heavy elements play a crucial role.",1807.10856v1
+2008-08-29,Effect of Induced Spin-Orbit Coupling for Atoms via Laser Fields,"We propose an experimental scheme to study spin-orbit coupling effects in a
+of two-dimensional (2D) Fermi atomic gas cloud by coupling its internal
+electronic states (pseudospins) to radiation in a delta configuration. The
+induced spin-orbit coupling can be of the Dresselhaus and Rashba type with and
+without a Zeeman term. We show that the optically induced spin-orbit coupling
+can lead to a spin-dependent effective mass under appropriate condition, with
+one of them able to be tuned between positive and negative effective mass. As a
+direct observable we show that in the expansion dynamics of the atomic cloud
+the initial atomic cloud splits into two clouds for the positive effective mass
+case regime, and into four clouds for the negative effective mass regime.",0808.4137v2
+2016-10-15,Bloch Oscillations in Optical and Zeeman Lattices in the Presence of Spin-Orbit Coupling,"We address Bloch oscillations of a spin-orbit coupled atom in periodic
+potentials of two types: Optical and Zeeman lattices. We show that in optical
+lattices the spin-orbit coupling allows controlling the direction of atomic
+motion and may lead to complete suppression of the oscillations at specific
+values of the coupling strength. In Zeeman lattices the energy bands are found
+to cross each other at the boundaries of the Brillouin zone, resulting in
+period-doubling of the oscillations. In all cases, the oscillations are
+accompanied by rotation of the pseudo-spin, with a dynamics that is determined
+by the strength of the spin-orbit coupling. The predicted effects are discussed
+also in terms of a Wannier-Stark ladder, which in optical lattices consist of
+two mutually-shifted equidistant sub-ladders.",1610.04716v2
+2018-04-09,Crystal-field effects in graphene with interface-induced spin-orbit coupling,"We consider theoretically the influence of crystalline fields on the
+electronic structure of graphene placed on a layered material with reduced
+symmetry and large spin-orbit coupling (SOC). We use a perturbative procedure
+combined with the Slater-Koster method to derive the low-energy effective
+Hamiltonian around the $K$ points and estimate the magnitude of the effective
+couplings. Two simple models for the envisaged graphene-substrate hybrid
+bilayer are considered, in which the relevant atomic orbitals hybridize with
+either top or hollow sites of the graphene honeycomb lattice. In both cases,
+the interlayer coupling to a crystal-field-split substrate is found to generate
+highly anisotropic proximity spin-orbit interactions, including in-plane
+'spin-valley' coupling. Interestingly, when an anisotropic intrinsic-type SOC
+becomes sizeable, the bilayer system is effectively a quantum spin Hall
+insulator characterized by in-plane helical edge states robust against
+Bychkov-Rashba effect. Finally, we discuss the type of substrate required to
+achieve anisotropic proximity-induced SOC and suggest possible candidates to
+further explore crystal field effects in graphene-based heterostructures.",1804.03187v1
+2018-01-22,Universal relations for spin-orbit coupled Fermi gas near an s-wave resonance,"The synthetic spin-orbit coupled quantum gases is widely studied both
+experimentally and theoretically in recent years. As previous studies show,
+this modification of single-body dispersion will in general couple different
+partial waves and thus distort the wave-function of bound states which
+determines the short-distance behavior of many-body wave function. In this
+work, we focus on the two-component Fermi gas with one-dimensional or
+three-dimensional spin-orbit coupling near an s-wave resonance. Using the
+method of effective field theory and the operator product expansion, we derive
+universal relations for both systems, and obtain the momentum distribution
+matrix $\left<\psi^\dagger_a(\mathbf{q})\psi_b(\mathbf{q})\right>$ at large
+$\mathbf{q}$ ($a,b$ are spin index), which shows anisotropic features. We also
+discuss the experimental implication of these results depending on the
+realization of the spin-orbit coupling.",1801.07001v2
+2020-05-28,Multiple odd-parity superconducting phases in bilayer transition metal dichalcogenides,"We study unconventional superconductivity in a two-dimensional locally
+noncentrosymmetric triangular lattice. The model is relevant to bilayer
+transition metal dichalcogenides with 2H$_b$ stacking structure, for example.
+The superconducting instability is analyzed by solving the linearized
+Eliashberg equation within the random phase approximation. We show that
+ferromagnetic fluctuations are dominant owing to the existence of disconnected
+Fermi pockets near van Hove singularity, and hence odd-parity spin-triplet
+superconductivity is favored. In the absence of the spin-orbit coupling, we
+find that odd-parity $f$-wave superconducting state is stabilized in a wide
+range of carrier density and interlayer coupling. Furthermore, we investigate
+impacts of the layer-dependent staggered Rashba and Zeeman spin-orbit coupling
+on the superconductivity. Multiple odd-parity superconducting phase diagrams
+are obtained as a function of the spin-orbit coupling and Coulomb interaction.
+Especially, a topological chiral $p$-wave pairing state is stabilized in the
+presence of a moderate Zeeman spin-orbit coupling. Our results shed light on a
+possibility of odd-parity superconductivity in various ferromagnetic van der
+Waals materials.",2005.13963v1
+2021-04-20,Analytical results for the superflow of spin-orbit-coupled Bose-Einstein condensates in optical lattices,"In this paper, we show that for sufficiently strong atomic interactions,
+there exist analytical solutions of current-carrying nonlinear Bloch states at
+the Brillouin zone edge to the model of spin-orbit-coupled Bose-Einstein
+condensates (BECs) with symmetric spin interaction loaded into optical
+lattices. These simple but generic exact solutions provide an analytical
+demonstration of some intriguing properties which have neither an analog in the
+regular BEC lattice systems nor in the uniform spin-orbit-coupled BEC systems.
+It is an analytical example for understanding the superfluid and other related
+properties of the spin-orbit-coupled BEC lattice systems.",2104.09796v2
+2011-10-19,Fano resonances and electron spin transport through a two-dimensional spin-orbit-coupled quantum ring,"Electron transport through a spin-orbit-coupled quantum ring is investigated
+within linear response theory. We show that the finite width of the ring
+results in the appearance of Fano resonances in the conductance. This turns out
+to be a consequence of the spin-orbit interaction that leads to a breaking of
+the parity of the states localized in the ring. The resonances appear when the
+system is close to maxima of Aharonov-Casher conductance oscillations where
+spin transfer is heavily modified. When the spin-orbit coupling strength is
+detuned from the Aharonov-Casher maxima the resonances are broadened resulting
+in a dependence of the spin transport on the electron Fermi energy in contrast
+to predictions from one-dimensional models",1110.4233v1
+2013-01-04,Observation of Zitterbewegung in a spin-orbit coupled Bose-Einstein condensate,"Spin-orbit coupled ultra-cold atoms provide an intriguing new avenue for the
+study of rich spin dynamics in superfluids. In this Letter, we observe
+Zitterbewegung, the simultaneous velocity (thus position) and spin
+oscillations, of neutral atoms between two spin-orbit coupled bands in a
+Bose-Einstein condensate (BEC) through sudden quantum quenches of the
+Hamiltonian. The observed Zitterbewegung oscillations are perfect on a short
+time scale but gradually damp out on a long time scale, followed by sudden and
+strong heating of the BEC. As an application, we also demonstrate how
+Zitterbewegung oscillations can be exploited to populate the upper spin-orbit
+band, and observe a subsequent dipole motion. Our experimental results are
+corroborated by a theoretical and numerical analysis and showcase the great
+flexibility that ultra-cold atoms provide for investigating rich spin dynamics
+in superfluids.",1301.0658v2
+2015-08-27,Localization and spin transport in honeycomb structures with spin-orbit coupling,"Transfer-matrix methods are used for a tight-binding description of electron
+transport in graphene-like geometries, in the presence of spin-orbit couplings.
+Application of finite-size scaling and phenomenological renormalization
+techniques shows that, for strong enough spin-orbit interactions and increasing
+on-site disorder, this system undergoes a metal-insulator transition
+characterized by the exponents $\nu=2.71(8)$, $\eta=0.174(2)$. We show how one
+can extract information regarding spin polarization decay with distance from an
+injection edge, from the evolution of wave-function amplitudes in the
+transfer-matrix approach. For (relatively weak) spin-orbit coupling intensity
+$\mu$, we obtain that the characteristic length $\Lambda_s$ for
+spin-polarization decay behaves as $\Lambda_s \propto \mu^{-2}$.",1508.06873v2
+2016-10-03,Orbital driven impurity spin effect on the magnetic order of quasi-three dimensional cupric oxide,"Density functional calculations are performed to study the magnetic order of
+the severely distorted square planar cupric oxide (CuO) and local spin disorder
+in it in the presence of the transition metal impurities M (= Cr, Mn, Fe, Co
+and Ni). The distortion in the crystal structure, arisen to reduce the band
+energy by minimizing the covalent interaction, creates two crisscrossing zigzag
+spin-1/2 chains. From the spin dimer analysis we find that while the spin chain
+along [10$\bar 1$] has strong Heisenberg type antiferromagnetic coupling (J ~
+127 meV), along [101] it exhibits weak, but robust, ferromagnetic coupling (J ~
+9 meV) mediated by reminiscent p-d covalent interactions. The impurity effect
+on the magnetic ordering is independent of M and purely orbital driven. If the
+given spin-state of M is such that the d$_{x^2-y^2}$ orbital is spin-polarized,
+then the original long-range ordering is maintained. However, if d$_{x^2-y^2}$
+orbital is unoccupied, the absence of corresponding covalent interaction breaks
+the weak ferromagnetic coupling and a spin-flip takes place at the impurity
+site leading to breakdown of the long range magnetic ordering.",1610.00458v1
+2017-01-12,Optical spin transfer and spin-orbit torques in thin film ferromagnets,"We study the optically induced torques in thin film ferromagnetic layers
+under excitation by circularly polarized light. We study cases both with and
+without Rashba spin-orbit coupling using a 4-band model. In the absence of
+Rashba spin-orbit coupling, we derive an analytic expression for the optical
+torques, revealing the conditions under which the torque is mostly derived from
+optical spin transfer torque (i.e. when the torque is along the direction of
+optical angular momentum), versus when the torque is derived from the inverse
+Faraday effect (i.e. when the torque is perpendicular to the optical angular
+momentum). We find the optical spin transfer torque dominates provided that the
+excitation energy is far away from band edge transitions, and the magnetic
+exchange splitting is much greater than the lifetime broadening. For the case
+with large Rashba spin-orbit coupling and out-of-plane magnetization, we find
+the torque is generally perpendicular to the photon angular momentum and is
+ascribed to an optical Edelstein effect.",1701.03495v2
+2010-02-02,Generalized Rashba spin-orbit coupling for cold atoms,"We study the possibility to generate a new type of spin-orbit coupling for
+the center of mass motion of cold atoms, using laser beams that resonantly
+couple N atomic internal ground states to an extra state. After a general
+analysis of the scheme, we concentrate on the tetrapod setup (N=4) where the
+atomic state can be described by a three-component spinor, evolving under the
+action of a Rashba-type spin-orbit coupling for a spin 1 particle. We
+illustrate a consequence of this coupling by studying the negative refraction
+of atoms at a potential step, and show that the amplitude of the refracted beam
+is significantly increased in comparison to the known case of spin 1/2 Rashba
+coupling. Finally we explore a possible implementation of this tetrapod setup,
+using stimulated Raman couplings between Zeeman sublevels of the ground state
+of alkali atoms.",1002.0578v2
+2017-04-04,Phonon-derived ultrafast relaxation of spin-valley polarized states in MoS_{2},"The valley degree of freedom and the possibility of spin-valley coupling of
+solid materials have attracted growing interest, and the relaxation dynamics of
+spin- and valley-polarized states has become an important focus of recent
+studies. In spin-orbit-coupled inversion-asymmetric two-dimensional materials,
+such as MoS_{2} it has been found that the spin randomization is
+characteristically faster than the time scales for inter- and intra-valley
+scatterings. In this study, we examined the ultrafast non-collinear spin
+dynamics of an electron valley in monolayer MoS_{2} by using real-time
+propagation time-dependent density functional theory. We found that the spin
+precession of an electron in the valley is sharply coupled with the
+lowest-lying optical phonon that release the in-plane mirror symmetry. This
+indicates that the spin randomization of MoS_{2} is mainly caused by
+spin-phonon interaction. We further suggest that flipping of spins in a
+spin-orbit-coupled system can be achieved by the control over phonons.",1704.00921v1
+2018-06-03,Quantum Spin Dynamics in a Normal Bose Gas with Spin-orbit Coupling,"In this Letter, we investigate spin dynamics of a two-component Bose gas with
+spin-orbit coupling realised in cold atom experiments. We derive coupled
+hydrodynamic equations for number and spin densities as well as their
+associated currents. Specialising to quasi-one-dimensional situation, we obtain
+analytic solutions of the spin helix structure and its dynamics in both
+adiabatic and diabatic regimes. In the adiabatic regime, the transverse spin
+decays parabolically in the short-time limit and exponentially in the long time
+limit, depending on initial polarisation. In contrast, in the diabatic regime,
+transverse spin density and current oscillate in a way similar to the
+charge-current oscillation in an undamped LC circuit. The effects of Rabi
+coupling on the short-time spin dynamics is also discussed. Finally, using
+realistic experimental parameters for $^{87}$Rb, we show that the time scales
+for spin dynamics is of order of milliseconds to a few seconds and can be
+observed experimentally.",1806.00766v2
+2015-03-24,Innermost stable circular orbits of spinning test particles in Schwarzschild and Kerr space-times,"We consider the motion of classical spinning test particles in Schwarzschild
+and Kerr metrics and investigate innermost stable circular orbits (ISCO). The
+main goal of this work is to find analytically the small-spin corrections for
+the parameters of ISCO (radius, total angular momentum, energy, orbital angular
+frequency) of spinning test particles in the case of vectors of black hole
+spin, particle spin and orbital angular momentum being collinear to each other.
+We analytically derive the small-spin linear corrections for arbitrary Kerr
+parameter $a$. The cases of Schwarzschild, slowly rotating and extreme Kerr
+black hole are considered in details. For a slowly rotating black hole the ISCO
+parameters are obtained up to quadratic in $a$ and particle's spin $s$ terms.
+From the formulae obtained it is seen that the spin-orbital coupling has
+attractive character when spin and angular momentum are parallel and repulsive
+when they are antiparallel. For the case of the extreme Kerr black hole with
+co-rotating particle we succeed to find the exact analytical solution for the
+limiting ISCO parameters for arbitrary spin. It has been shown that the
+limiting values of ISCO radius and frequency do not depend on the particle's
+spin while values of energy and total angular momentum depend on it. We have
+also considered circular orbits of arbitrary radius and have found small-spin
+linear corrections for the total angular momentum and energy at given radius.
+System of equations for numerical calculation of ISCO parameters for arbitrary
+$a$ and $s$ is also explicitly written.",1503.07060v2
+2017-03-24,Effects of anisotropy in spin molecular-orbital coupling on effective spin models of trinuclear organometallic complexes,"We consider layered decorated honeycomb lattices at two-thirds filling, as
+realized in some trinuclear organometallic complexes. Localized $S=1$ moments
+with a single-spin anisotropy emerge from the interplay of Coulomb repulsion
+and spin molecular-orbit coupling (SMOC). Magnetic anisotropies with bond
+dependent exchange couplings occur in the honeycomb layers when the direct
+intracluster exchange and the spin molecular-orbital coupling are both present.
+We find that the effective spin exchange model within the layers is an XXZ +
+120$^\circ$ honeycomb quantum compass model. The intrinsic non-spherical
+symmetry of the multinuclear complexes leads to very different transverse and
+longitudinal spin molecular-orbital couplings, which greatly enhances the
+single-spin and exchange coupling anisotropies. The interlayer coupling is
+described by a XXZ model with anisotropic biquadratic terms. As the correlation
+strength increases the systems becomes increasingly one-dimensional. Thus, if
+the ratio of SMOC to the interlayer hopping is small this stabilizes the
+Haldane phase. However, as the ratio increases there is a quantum phase
+transition to the topologically trivial `$D$-phase'. We also predict a quantum
+phase transition from a Haldane phase to a magnetically ordered phase at
+sufficiently strong external magnetic fields.",1703.08343v3
+2023-09-20,Generalized Kohn-Sham Approach for the Electronic Band Structure of Spin-Orbit Coupled Materials,"Spin-current density functional theory (SCDFT) is a formally exact framework
+designed to handle the treatment of interacting many-electron systems including
+spin-orbit coupling at the level of the Pauli equation. In practice, robust and
+accurate calculations of the electronic structure of these systems call for
+functional approximations that depend not only on the densities, but also on
+spin-orbitals. Here we show that the call can be answered by resorting to an
+extension of the Kohn-Sham formalism, which admits the use of non-local
+effective potentials, yet it is firmly rooted in SCDFT. The power of the
+extended formalism is demonstrated by calculating the spin-orbit-induced
+band-splittings of inversion-asymmetric MoSe$_2$ monolayer and
+inversion-symmetric bulk $\alpha$-MoTe$_2$. We show that quantitative agreement
+with experimental data is obtainable via global hybrid approximations by
+setting the fraction of Fock exchange at the same level which yields accurate
+values of the band gap. Key to these results is the ability of the method to
+self-consistently account for the spin currents induced by the spin-orbit
+interaction. The widely used method of refining spin-density functional theory
+by a second-variational treatment of spin-orbit coupling is unable to match our
+SCDFT results.",2309.11158v2
+2005-07-07,Classical memory effects on spin dynamics in two-dimensional systems,"We discuss classical dynamics of electron spin in two-dimensional
+semiconductors with a spin-split spectrum. We focus on a special case, when
+spin-orbit induced random magnetic field is directed along a fixed axis. This
+case is realized in III-V-based quantum wells grown in [110] direction and also
+in [100]-grown quantum wells with equal strength of Dresselhaus and
+Bychkov-Rashba spin-orbit couplings. We show that in such wells the long-time
+spin dynamics is determined by non-Markovian memory effects. Due to these
+effects the non-exponential tail $1/t^2$ appears in the spin polarization.",0507171v2
+2008-11-25,Anisotropic profiles in the spin polarization of multichannel semiconductor rings with Rashba spin orbit coupling,"We investigate the spin accumulation effect in eccentric semiconductor
+multichannel rings with Rashba spin-orbit interaction and threaded by a
+magnetic flux. Due to the finite eccentricity, the spin polarization induced at
+the borders of the sample is anisotropic and exhibits different patterns and
+intensities at specific angular directions. This effect, reminiscent of the
+spin polarization drift induced by the application of an in plane electric
+field, could be used to manipulate and functionalize the spin polarization in
+electronic nanorings.",0811.4125v1
+2009-05-07,Electron spin relaxation in n-type InAs quantum wires,"We investigate the electron spin relaxation of $n$-type InAs quantum wires by
+numerically solving the fully microscopic kinetic spin Bloch equations with the
+relevant scattering explicitly included. We find that the quantum-wire size and
+the growth direction influence the spin relaxation time by modulating the
+spin-orbit coupling. Due to inter-subband scattering in connection with the
+spin-orbit interaction, spin-relaxation in quantum wires can show different
+characteristics from those in bulk or quantum wells and can be effectively
+manipulated by various means.",0905.0937v2
+2009-05-08,Tuning the Spin Hall Effect in a Two-Dimensional Electron Gas,"We provide a theoretical framework for the electric field control of the
+electron spin in systems with diffusive electron motion. The approach is valid
+in the experimentally important case where both intrinsic and extrinsic
+spin-orbit interaction in a two-dimensional electron gas are present
+simultaneously. Surprisingly, even when the extrinsic mechanism is the dominant
+driving force for spin Hall currents, the amplitude of the spin Hall
+conductivity may be considerably tuned by varying the intrinsic spin-orbit
+coupling via a gate voltage. Furthermore we provide an explanation of the
+experimentally observed out-of-plane spin polarization in a (110) GaAs quantum
+well.",0905.1269v1
+2011-06-02,Spin-dependent inertial force and spin current in accelerating systems,"The spin-dependent inertial force in an accelerating system under the
+presence of electromagnetic fields is derived from the generally covariant
+Dirac equation. Spin currents are evaluated by the force up to the lowest order
+of the spin-orbit coupling in both ballistic and diffusive regimes. We give an
+interpretation of the inertial effect of linear acceleration on an electron as
+an effective electric field and show that mechanical vibration in a high
+frequency resonator can create a spin current via the spin-orbit interaction
+augmented by the linear acceleration.",1106.0366v1
+2013-09-17,Theory of Electrical Spin Manipulation in Spin-Orbit Coupling Systems,"By associating a spin-orbit interaction with a non-Abelian gauge potential,
+we theoretically present a spin polarization in a quite general form using an
+effective Yang-Mills field and a usual electromagnetic field. In this gauge
+invariant result, we focus on a purely electrically-induced spin contribution.
+We find that both the inverse spin galvanic effect and the spin Hall effect
+arise from the same origin, i.e., the SU(2)$\times$U(1) Hall effect. We also
+discover that a large effective magnetic field of the order of 1T is induced in
+the Rashba system.",1309.4205v1
+2017-11-21,Current-induced spin polarization in isotropic k-cubed Rashba model: Theoretical study for p-doped semiconductor heterostructures and perovskite oxides interfaces,"Using the Matsubara Green's function formalism we calculate the temperature
+dependence of the nonequilibrium spin polarization induced by an external
+electric field in the presence of spin-orbit coupling. The model Hamiltonian
+includes an isotropic k-cubed form of the Rashba spin-orbit interaction. Such a
+Hamiltonian captures the electronic and spin properties of two-dimensional
+electron (hole) gas at the surfaces or interfaces of transition metal oxides or
+in p-doped semiconductor heterostructures. The induced spin polarization is
+calculated for the nonmagnetic as well as magnetic electron/hole gas. Relation
+of the spin polarization to the Berry curvature is also discussed.",1711.07707v1
+2009-03-06,The two-impurity Kondo model with spin-orbit interactions,"We study the two-impurity Kondo model (TIKM) in two dimensions with
+spin-orbit coupled conduction electrons. In the first part of the paper we
+analyze how spin-orbit interactions of Rashba as well as Dresselhaus type
+influence the Kondo and RKKY interactions in the TIKM, generalizing results
+obtained by H. Imamura {\em et al.} (2004) and J. Malecki (2007). Using our
+findings we then explore the effect from spin-orbit interactions on the
+non-Fermi liquid quantum critical transition between the RKKY-singlet and
+Kondo-screened RKKY-triplet states. We argue that spin-orbit interactions under
+certain conditions produce a line of critical points exhibiting the same
+leading scaling behavior as that of the ordinary TIKM. In the second part of
+the paper we shift focus and turn to the question of how spin-orbit
+interactions affect the entanglement between two localized RKKY-coupled spins
+in the parameter regime where the competition from the direct Kondo interaction
+can be neglected. Using data for a device with two spinful quantum dots
+patterned in a gated InAs heterostructure we show that a gate-controlled
+spin-orbit interaction may drive a maximally entangled state to one with
+vanishing entanglement, or vice versa (as measured by the concurrence). This
+has important implications for proposals using RKKY interactions for nonlocal
+control of qubit entanglement in semiconductor heterostructures.",0903.1207v2
+2022-12-15,Electric field tuning of magnetic states in single magnetic molecules,"Single magnetic molecules may be the smallest functional magnets. An
+electric-field controllable spin state of magnetic molecules is of fundamental
+importance for applications while its realization remains challenging. To date
+the observed spin-electric interaction based on spin-orbit coupling or spin
+dipole coupling is useful to tune fine spin structures but too weak to flip the
+spin state. In this work, we propose a new mechanism to realize enhanced
+spin-electric coupling and flip the spin states by tuning the spin
+superexchange between local spins. Using first-principles calculations and
+Heisenberg Hamiltonian, we demonstrate this effect in a family of magnetic
+molecules, transition metallic Porphyrins. We show that their d-{\pi} and
+{\pi}-{\pi} spin superexchange couplings are determined by the relative
+energies of d and {\pi} electronic states, which are sensitive to the applied
+electric field. Therefore, applying electric field can tune a wide range of
+magnetic ground states, including ferromagnetic, ferrimagnetic, and
+antiferromagnetic configurations. This spin-electric coupling may provide a new
+approach for designing and controlling molecular spintronics.",2212.08010v1
+2003-03-19,Anomalous spin-orbit effects in a strained InGaAs/InP quantum well structure,"There currently is a large effort to explore spin-orbit effects in
+semiconductor structures with the ultimate goal of manipulating electron spins
+with gates. A search for materials with large spin-orbit coupling is therefore
+important. We report results of a study of spin-orbit effects in a strained
+InGaAs/InP quantum well. The spin-orbit relaxation time, determined from the
+weak antilocalization effect, was found to depend non-monotonically on gate
+voltage. The spin orbit scattering rate had a maximum value of $5\times
+10^{10}s^{-1}$ at an electron density of $n=3\times 10^{15} m^{-2}$. The
+scattering rate decreased from this for both increasing and decreasing
+densities. The smallest measured value was approximately $10^9 s^{-1}$ at an
+electron concentration of $n=6\times 10^{15} m^{-2}$. This behavior could not
+be explained by either the Rashba nor the bulk Dresselhaus mechanisms but is
+attributed to asymmetry or strain effects at dissimilar quantum well
+interfaces.",0303401v2
+2006-02-20,Exact Landau Levels in Two-Dimensional Electron Systems with Rashba and Dresselhaus Spin-Orbit Interactions in a Perpendicular Magnetic Field,"We study a two-dimensional electron system in the presence of both Rashba and
+Dresselhaus spin-orbit interactions in a perpendicular magnetic field. Defining
+two suitable boson operators and using the unitary transformations we are able
+to obtain the exact Landau levels in the range of all the parameters. When the
+strengths of the Rashba and Dresselhaus spin-orbit interactions are equal, a
+new analytical solution for the vanishing Zeeman energy is found, where the
+orbital and spin wave functions of electron are separated. It is also shown
+that in this case the Zeeman and spin-orbit splittings are independent of the
+Landau level index $n$. Due to the Zeeman energy, new crossing between the
+eigenstates $|n, k, s=1, \sigma>$ and $|n+1, k, s^\prime =-1, \sigma^\prime>$
+is produced at certain magnetic field for larger Rashba spin-orbit coupling.
+This degeneracy leads to a resonant spin Hall conductance if it happens at the
+Fermi level.",0602473v1
+2021-05-10,Spin-orbit correlations and exchange-bias control in twisted Janus dichalcogenide multilayers,"Janus dichalcogenide multilayers provide a paradigmatic platform to engineer
+electronic phenomena dominated by spin-orbit coupling. Their unique spin-orbit
+effects stem from local mirror symmetry breaking in each layer, which induces a
+colossal Rashba spin-orbit effect in comparison with the conventional
+dichalcogenide counterparts. Here we put forward twisted dichalcogenide
+bilayers as a simple platform to realize spin-orbit correlated states. We
+demonstrate the emergence of flat bands featuring strong spin-momentum locking
+and the emergence of non-collinear symmetry broken states when interactions are
+included. We further show that the symmetry broken states can be controlled by
+means of a magnetic substrate, strongly impacting the non-collinear magnetic
+texture of the moire unit cell. Our results put forward twisted Janus
+multilayers as a powerful platform to explore spin-orbit correlated physics,
+and highlighting the versatility of magnetic substrates to control
+unconventional moire magnetism.",2105.04502v3
+2010-09-28,Intrinsic spin-orbit interactions in flat and curved graphene nanoribbons,"Recent theoretical and experimental works on carbon nanotubes and graphene
+samples have revealed that spin-orbit interactions, though customarily ignored
+in carbon-based materials, are more important and complex than it was thought.
+We study the intrinsic spin-orbit coupling effects on graphene nanoribbons,
+both flat and bent. Calculations are performed within the tight-binding model
+with the inclusion of a four-orbital basis set. Thereby the full symmetry of
+the honeycomb lattice and the hybridization of $\sigma$ and $\pi$ bands are
+considered. In addition to the zero-energy $\pi$-edge states, $\sigma$-derived
+edge states are found for the three investigated ribbon geometries. The
+$\sigma$ states are also spin-filtered and localized at the boundaries of the
+ribbons. The calculated spin-orbit splittings are larger for the $\sigma$- than
+for the $\pi$-derived edge states. Due to this enhancement, spin-orbit
+splittings of the $\sigma$-states reach values of the order of a few Kelvin.
+These spin-filtered edge states are robust under $\sigma-\pi$ hybridization and
+curvature effects.",1009.5560v1
+2017-03-06,Estimating spin diffusion length and spin Hall angle from spin pumping-induced inverse spin Hall voltages,"There exists considerable confusion in estimating the spin diffusion length
+of materials with high spin-orbit coupling from spin pumping experiments. For
+designing functional devices, it is important to determine the spin diffusion
+length with sufficient accuracy from experimental results. An inaccurate
+estimation of spin diffusion length also affects the estimation of other
+parameters (e.g., spin mixing conductance, spin Hall angle) concomitantly. The
+spin diffusion length for platinum (Pt) has been reported in literature in a
+wide range of 0.5 - 14 nm, and particularly it is a constant value independent
+of Pt's thickness. Here, the key reasonings behind such wide range of reported
+values of spin diffusion length have been identified comprehensively.
+Particularly, it is shown here that a thickness-dependent conductivity and spin
+diffusion length is necessary to simultaneously match the experimental results
+of effective spin mixing conductance and inverse spin Hall voltage due to spin
+pumping. Such thickness-dependent spin diffusion length is tantamount to
+Elliott-Yafet spin relaxation mechanism, which bodes well for transitional
+metals. This conclusion is not altered even when there is significant
+interfacial spin memory loss. Furthermore, the variations in the estimated
+parameters are also studied, which is important for technological applications.",1704.02339v2
+2014-04-10,Spin force and intrinsic spin Hall effect in spintronics systems,"We investigate the spin Hall effect (SHE) in a wide class of spin-orbit
+coupling systems by using spin force picture. We derive the general relation
+equation between spin force and spin current and show that the longitudinal
+force component can induce a spin Hall current, from which we reproduce the
+spin Hall conductivity obtained previously using Kubo's formula. This simple
+spin force picture gives a clear and intuitive explanation for SHE.",1404.2732v1
+2004-03-15,Dynamically generated dimension reduction and crossover in a spin orbital model,"We study a spin orbital model in which the spin-spin interaction couples
+linearly to the orbital isospin. Fluctuations drive the transition from
+paramagnetic state to C type ordered state into a strongly first order one, as
+observed in $V_2O_3$. At T=0, there is a FOCS to FOGS transition. Close to the
+transition point, the system shows dynamically generated dimension reduction
+and crossover, resulting in one or more spin reentrant transitions.",0403370v1
+2005-10-10,Role of the spin-orbit splitting and the dynamical fluctuations in the Si(557)-Au surface,"Our it ab initio calculations show that spin-orbit coupling is crucial to
+understand the electronic structure of the Si(557)-Au surface. The spin-orbit
+splitting produces the two one-dimensional bands observed in photoemission,
+which were previously attributed to spin-charge separation in a Luttinger
+liquid. This spin splitting might have relevance for future device
+applications. We also show that the apparent Peierls-like transition observed
+in this surface by scanning tunneling microscopy is a result of the dynamical
+fluctuations of the step-edge structure, which are quenched as the temperature
+is decreased.",0510239v1
+2009-05-04,Spin-Orbit Interactions in Bilayer Exciton-Condensate Ferromagnets,"Bilayer electron-hole systems with unequal electron and hole densities are
+expected to have exciton condensate ground states with spontaneous
+spin-polarization in both conduction and valence bands. In the absence of
+spin-orbit and electron-hole exchange interactions there is no coupling between
+the spin-orientations in the two quantum wells. In this article we show that
+Rashba spin-orbit interactions lead to unconventional magnetic anisotropies,
+whose strength we estimate, and to ordered states with unusual quasiparticle
+spectra.",0905.0392v1
+2016-10-24,Spin orbit effects in CoFeB/MgO hetereostructures with heavy metal underlayers,"We study effects originating from the strong spin orbit coupling in CoFeB/MgO
+heterostructures with heavy metal (HM) underlayers. The perpendicular magnetic
+anisotropy at the CoFeB/MgO interface, the spin Hall angle of the heavy metal
+layer, current induced torques and the Dzyaloshinskii-Moriya interaction at the
+HM/CoFeB interfaces are studied for films in which the early 5d transition
+metals are used as the HM underlayer. We show how the choice of the HM layer
+influences these intricate spin orbit effects that emerge within the bulk and
+at interfaces of the heterostructures.",1610.07473v1
+2015-09-11,Effective spin Hall properties of a mixture of materials with and without spin-orbit coupling: Tailoring the effective spin-diffusion length,"We study theoretically the effective spin Hall properties of a composite
+consisting of two materials with and without spin-orbit (SO) coupling. In
+particular, we assume that SO material represents a system of grains in a
+matrix with no SO. We calculate the effective spin Hall angle and the effective
+spin diffusion length of the mixture. Our main qualitative finding is that,
+when the bare spin diffusion length is much smaller than the radius of the
+grain, the effective spin diffusion length is strongly enhanced, well beyond
+the ""geometrical"" factor. The physical origin of this additional enhancement is
+that, with small diffusion length, the spin current mostly flows around the
+grain without suffering much loss. We also demonstrate that the voltage,
+created by a spin current, is sensitive to a very weak magnetic field directed
+along the spin current, and even reverses sign in a certain domain of fields.
+The origin of this sensitivity is that the spin precession, caused by magnetic
+field, takes place outside the grains where SO is absent.",1509.03373v1
+2016-11-23,Room temperature manipulation of long lifetime spins in metallic-like carbon nanospheres,"The time-window for processing electron spin information (spintronics) in
+solid-state quantum electronic devices is determined by the spin-lattice (T1)
+and spin-spin (T2) relaxation times of electrons. Minimising the effects of
+spin-orbit coupling and the local magnetic contributions of neighbouring atoms
+on T1 and T2 at room temperature remain substantial challenges to practical
+spintronics. Here, we report a record-high conduction electron T1=T2 of 175 ns
+at 300 K in 37 nm +/- 7 nm carbon spheres, which exceeds by far the highest
+values observed for any conducting solid state material of comparable size. The
+long T1=T2 is due to quantum confinement effects, to the intrinsically weak
+spin-orbit coupling of carbon, and to the protecting nature of the outer shells
+of the inner spins from the influences of environmental disturbances. Following
+the observation of spin polarization by electron spin resonance, we controlled
+the quantum state of the electron spin by applying short bursts of an
+oscillating magnetic field and observed coherent oscillations of the spin
+state. These results demonstrate the feasibility of operating electron spins in
+conducting carbon nanospheres as quantum bits at room temperature.",1611.07690v1
+2010-04-16,Random Spin-orbit Coupling in Spin Triplet Superconductors: Stacking Faults in Sr_2RuO_4 and CePt_3Si,"The random spin-orbit coupling in multicomponent superconductors is
+investigated focusing on the non-centrosymmetric superconductor CePt_3Si and
+the spin triplet superconductor Sr_2RuO_4. We find novel manifestations of the
+random spin-orbit coupling in the multicomponent superconductors with
+directional disorders, such as stacking faults. The presence of stacking faults
+is indicated for the disordered phase of CePt_3Si and Sr_2RuO_4. It is shown
+that the d-vector of spin triplet superconductivity is locked to be d = k_y x -
+k_x y with the anisotropy \Delta T_c/T_c0 \sim \bar{\alpha}^2/T_c0 W_z, where
+\bar{\alpha}, T_c0, and W_z are the mean square root of random spin-orbit
+coupling, the transition temperature in the clean limit, and the kinetic energy
+along the c-axis, respectively. This anisotropy is much larger (smaller) than
+that in the clean bulk Sr_2RuO_4 (CePt_3Si). These results indicate that the
+helical pairing state d = k_y x - k_x y in the eutectic crystal
+Sr_2RuO_4-Sr_3Ru_2O_7 is stabilized in contrast to the chiral state d = (k_x
+\pm i k_y) z in the bulk Sr_2RuO_4. The unusual variation of T_c in CePt_3Si is
+resolved by taking into account the weak pair-breaking effect arising from the
+uniform and random spin-orbit couplings. These superconductors provide a basis
+for discussing recent topics on Majorana fermions and non-Abelian statistics.",1004.2762v4
+2023-07-28,Magnetic supersolid phases of two-dimensional extended Bose-Hubbard model with spin-orbit coupling,"The study of ultracold atomic spin systems with long-range interaction
+provides the possibility of searching for magnetic supersolid phases in quantum
+many-body scenarios. In this paper, we consider two-species Bose gases with
+spin-orbit coupling and nearest-neighbor interaction confined in a
+two-dimensional optical lattice. The competition between spin-orbit coupling
+and interactions creates rich ground-state diagrams with supersolid phases
+exhibiting phase modulations or magnetic orderings. We obtain the phase-twisted
+and phase-striped pair checkboard supersolid phases that are generated by the
+combination of spin-orbit coupling and intraspecies nearest-neighbor
+interaction. The introduction of interspecies nearest-neighbor interaction
+enriches the quantum phases of the system. It leads to the appearance of the
+phase-twisted and phase-striped lattice supersolid phases. In addition to the
+lattice supersolid phase, we find the emergence of nontrivial supersolid phases
+that depend on the interspecies on-site interaction strength. The
+lattice-insulated supersolid phase with supersolidility in one species but
+insulation in the other exists in the miscible domain, while the pair striped
+supersolid phase with stripe structures in each species is in the immiscible
+domain. Finally, to further characterize each phase, we discuss their
+spin-dependent momentum distributions and spin textures. The magnetic textures,
+such as antiferromagnetic, spiral and stripe orders, are shown in SS phases.
+The results here could help in the observe for these magnetic supersolid phases
+in ultracold atomic experiments with nearest-neighbor interaction and
+spin-orbit coupling in optical lattice.",2307.15310v2
+2018-02-19,Spin-orbit coupling effects in zinc-blende InSb and wurtzite InAs nanowires: Realistic calculations with multiband $\vec{k} \cdot \vec{p}$ method,"A systematic numerical investigation of spin-orbit fields in the conduction
+bands of III-V semiconductor nanowires is performed. Zinc-blende InSb nanowires
+are considered along [001], [011], and [111] directions, while wurtzite InAs
+nanowires are studied along [0001] and [10$\overline{1}$0] or
+[11$\overline{2}$0] directions. Realistic multiband $\vec{k} \cdot \vec{p}\,$
+Hamiltonians are solved by using plane-wave expansions of real-space
+parameters. In all cases the linear and cubic spin-orbit coupling parameters
+are extracted for nanowire widths from 30 to 100 nm. Typical spin-orbit
+energies are on the $\mu$eV scale, except for InAs wurtzite nanowires grown
+along [10$\overline{1}$0] or [11$\overline{2}$0], in which the spin-orbit
+energy is about meV, largely independent of the wire diameter. Significant
+spin-orbit coupling is obtained by applying a transverse electric field,
+causing the Rashba effect. For an electric field of about 4 mV/nm the obtained
+spin-orbit energies are about 1 meV for both materials in all investigated
+growth directions. The most favorable system, in which the spin-orbit effects
+are maximal, are InAs WZ nanowires grown along [1010] or [11$\overline{2}$0],
+since here spin-orbit energies are giant (meV) already in the absence of
+electric field. The least favorable are InAs WZ nanowires grown along [0001],
+since here even the electric field does not increase the spin-orbit energies
+beyond 0.1 meV. The presented results should be useful for investigations of
+optical orientation, spin transport, weak localization, and superconducting
+proximity effects in semiconductor nanowires.",1802.06734v2
+2013-01-23,Unconventional states of bosons with synthetic spin-orbit coupling,"Spin-orbit coupling with bosons gives rise to novel properties that are
+absent in usual bosonic systems. Under very general conditions, the
+conventional ground state wavefunctions of bosons are constrained by the
+""no-node"" theorem to be positive-definite. In contrast, the linear-dependence
+of spin-orbit coupling leads to complex-valued condensate wavefunctions beyond
+this theorem. In this article, we review the study of this class of
+unconventional Bose-Einstein condensations focusing on their topological
+properties. Both the 2D Rashba and 3D $\vec{\sigma} \cdot \vec{p}$-type Weyl
+spin-orbit couplings give rise to Landau-level-like quantization of
+single-particle levels in the harmonic trap. The interacting condensates
+develop the half-quantum vortex structure spontaneously breaking time-reversal
+symmetry and exhibit topological spin textures of the skyrmion type. In
+particular, the 3D Weyl coupling generates topological defects in the
+quaternionic phase space as an SU(2) generalization of the usual U(1) vortices.
+Rotating spin-orbit coupled condensates exhibit rich vortex structures due to
+the interplay between vorticity and spin texture. In the Mott-insulating states
+in optical lattices, quantum magnetism is characterized by the
+Dzyaloshinskii-Moriya type exchange interactions.",1301.5403v3
+2000-10-17,Spin-Orbit Coupling in the ab initio Pseudopotential Framework,"We describe the implementation of total angular momentum dependent
+pseudopotentials in a plane wave formulation of density functional theory. Our
+approach thus goes beyond the scalar-relativistic approximation usually made in
+ab initio pseudopotential calculations and explicitly includes spin-orbit
+coupling. We outline the necessary extensions and compare the results to
+available all-electron calculations and experimental data.",0010225v1
+2005-02-21,Comments on spin-orbit interaction of anyons,"The coupling of non-relativistic anyons (called exotic particles) to an
+electromagnetic field is considered. Anomalous coupling is introduced by adding
+a spin-orbit term to the Lagrangian. Alternatively, one has two Hamiltonian
+structures, obtained by either adding the anomalous term to the Hamiltonian, or
+by redefining the mass and the NC parameter. The model can also be derived from
+its relativistic counterpart.",0502181v1
+2010-07-26,Tunneling into d-wave superconductors: Effects of interface spin-orbit coupling,"Tunneling conductance of a clean normal metal/d-wave superconductor junction
+is studied by using the extended Blonder-Tinkham-Klapwijk formalism. We show
+that the conductance is significantly affected by the interface spin-orbit
+coupling of the Rashba type, which is inevitably present due to the asymmetry
+of the junction.",1007.4483v1
+2011-09-19,Condensate Fraction and Pair Coherence Lengths of Two-Dimension Fermi Gases with Spin-Orbit Coupling,"The effects of Rashba spin-orbit coupling on BCS-BEC crossover, the
+condensate fraction and pair coherence lengths for a two-component attractive
+Fermi gas in two dimension are studied. The results at $T=0K$ indicate that (1)
+when the strength of SOC is beyond a critical value, BCS-BEC crossover does not
+happen in a conventional sense; (2) SOC enhances the condensate fraction, but
+suppresses pair coherence lengths.",1109.3970v1
+2014-11-29,Influence of Hund's exchange and spin-orbit coupling on spectral properties of fcc-Ce: DFT+DMFT study,"Spectral properties of fcc-Ce have been calculated in frames of modern
+DFT+DMFT method with Hybridization expansion CT-QMC solver. The influence of
+Hund's exchange and spin-orbit coupling (SOC) on spectral properties of Ce were
+investigated. SOC is responsible for the shape of spectra near the Fermi level
+and Hund's exchange interaction doesn't change the obtained spectra and can be
+neglected.",1412.0140v1
+2011-09-22,Ground-state phases of ultracold bosons with Rashba-Dresselhaus spin-orbit coupling,"We study ultracold bosons in three dimensions with an anisotropic
+Rashba-Dresselhaus spin-orbit coupling. We first carry out the exact summation
+of ladder diagrams for the two-boson t-matrix at zero energy. Then, with the
+t-matrix as the effective interaction, we find the ground-state phase diagrams
+of bosons in mean field as a function of the spin-orbit coupling, the
+anisotropy, and the scattering lengths between particles in the same and in
+different pseudospin states. The resulting phase diagrams have much richer
+structures than those obtained using mean-field couplings, exhibiting three
+different phases: a plane-wave condensate, a striped condensate, and an
+unstable phase. The differences between the present approach using the t-matrix
+compared to using mean-field couplings is significant for large scattering
+lengths, large spin-orbit-coupling strength, or small anisotropy.",1109.4954v2
+2017-01-15,Analytical coupled-channels treatment of two-body scattering in the presence of three-dimensional isotropic spin-orbit coupling,"It is shown that the single-particle spin-orbit coupling terms, which---in
+the cold atom context---are associated with synthetic gauge fields, can
+significantly and non-trivially modify the phase accumulation at small
+interparticle distances even if the length scale $(k_{\text{so}})^{-1}$
+associated with the spin-orbit coupling term is significantly larger than the
+van der Waals length $r_{\text{vdW}}$ that characterizes the two-body
+interaction potential. A theoretical framework, which utilizes a generalized
+local frame transformation and accounts for the phase accumulation
+analytically, is developed. Comparison with numerical coupled-channels
+calculations demonstrates that the phase accumulation can, to a very good
+approximation, be described over a wide range of energies by the free-space
+scattering phase shifts---evaluated at a scattering energy that depends on
+$k_{\text{so}}$---and the spin-orbit coupling strength $k_{\text{so}}$.",1701.03979v1
+2017-09-11,Controlling the superconducting transition by spin-orbit coupling,"Whereas there exists considerable evidence for the conversion of singlet
+Cooper pairs into triplet Cooper pairs in the presence of inhomogeneous
+magnetic fields, recent theoretical proposals have suggested an alternative way
+to exert control over triplet generation: intrinsic spin-orbit coupling in a
+homogeneous ferromagnet coupled to a superconductor. Here, we proximity-couple
+Nb to an asymmetric Pt/Co/Pt trilayer, which acts as an effective spin-orbit
+coupled ferromagnet owing to structural inversion asymmetry. Unconventional
+modulation of the superconducting critical temperature as a function of
+in-plane and out-of- plane applied magnetic fields suggests the presence of
+triplets that can be controlled by the magnetic orientation of a single
+homogeneous ferromagnet. Our studies demonstrate for the first time an active
+role of spin-orbit coupling in controlling the triplets -- an important step
+towards the realization of novel superconducting spintronic devices.",1709.03504v2
+2023-09-27,Quantifying the large contribution from orbital Rashba effect to the effective damping-like torque on magnetization,"The generation of large spin currents, and the associated spin torques, which
+are at the heart of modern spintronics, have long been achieved by
+charge-to-spin conversion mechanisms, i.e. the spin Hall effect and/or the
+Rashba effect, intrinsically linked to a strong spin-orbit coupling. Recently,
+a novel path has been predicted and observed for achieving significant
+current-induced torques originating from light elements, hence possessing a
+weak spin-orbit interaction. These findings point out to the potential
+involvement of the orbital counterpart of electrons, namely the orbital Hall
+and orbital Rashba effects. In this study, we aim at quantifying these
+orbital-related contributions to the effective torques acting on a thin Co
+layer in different systems. First, in Pt|Co|Cu|AlOx stacking, we demonstrate a
+comparable torque strength coming from the conversion due to the orbital Rashba
+effect at the Cu|AlOx interface and the one from the effective spin Hall effect
+in bottom Pt|Co system. Secondly, in order to amplify the orbital-to-spin
+conversion, we investigate the impact of an intermediate Pt layer in
+Co|Pt|Cu|CuOx. From the Pt thickness dependence of the effective torques
+determined by harmonic Hall measurements complemented by spin Hall
+magneto-resistance and THz spectroscopy experiments, we demonstrate that a
+large orbital Rashba effect is present at the Cu|CuOx interface, leading to a
+twofold enhancement of the net torques on Co for the optimal Pt thickness. Our
+findings not only demonstrate the crucial role that orbital currents can play
+in low-dimensional systems with weak spin-orbit coupling, but also reveal that
+they enable more energy efficient manipulation of magnetization in spintronic
+devices.",2309.15987v2
+2000-10-16,Quantum Numbers of the V3+ Ion in V2o3,"It is argued that the V3+ ion in V2O3 should be considered as described by
+quantum numbers S=1 and L=3. It results from Hund's rules and means that the
+two d electrons form the highly- correlated electron system with the importance
+of the intra-atomic spin-orbit coupling. Keywords: highly-correlated electron
+system, crystal-field, spin- orbit coupling, orbital moment, V3+ ion. PACS:
+71.70.E, 75.10.D, 75.30.Gw",0010218v1
+2002-09-07,Variational study of the nu=1 quantum Hall ferromagnet in the presence of spin-orbit interaction,"We investigate the nu=1 quantum Hall ferromagnet in the presence of
+spin-orbit coupling of the Rashba or Dresselhaus type by means of
+Hartree-Fock-typed variational states. In the presence of Rashba (Dresselhaus)
+spin-orbit coupling the fully spin-polarized quantum Hall state is always
+unstable resulting in a reduction of the spin polarization if the product of
+the particle charge $q$ and the effective $g$-factor is positive (negative). In
+all other cases an alternative variational state with O(2) symmetry and finite
+in-plane spin components is lower in energy than the fully spin-polarized state
+for large enough spin-orbit interaction. The phase diagram resulting from these
+considerations differs qualitatively from earlier studies.",0209185v2
+2004-09-23,Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling,"The spin-orbit splitting of the electron levels in a two-dimensional quantum
+dot in a perpendicular magnetic field is studied. It is shown that at the point
+of an accidental degeneracy of the two lowest levels above the ground state the
+Rashba spin-orbit coupling leads to a level anticrossing and to mixing of
+spin-up and spin-down states, whereas there is no mixing of these levels due to
+the Dresselhaus term. We calculate the relaxation and decoherence times of the
+three lowest levels due to phonons. We find that the spin relaxation rate as a
+function of a magnetic field exhibits a cusp-like structure for Rashba but not
+for Dresselhaus spin-orbit interaction.",0409614v2
+2013-07-01,Phenomenology of Current-Induced Spin-Orbit Torques,"Currents induce magnetization torques via spin-transfer when the spin angular
+momentum is conserved or via relativistic spin-orbit coupling. Beyond simple
+models, the relationship between material properties and spin-orbit torques is
+not known. Here, we present a novel phenomenology of current-induced torques
+that is valid for any strength of intrinsic spin-orbit coupling. In $\rm
+Pt|Co|AlO_x$, we demonstrate that the domain walls move in response to a novel
+relativistic dissipative torque that is dependent on the domain wall structure
+and that can be controlled via the Dzyaloshinskii-Moriya interaction. Unlike
+the non-relativistic spin-transfer torque, the new torque can, together with
+the spin-Hall effect in the Pt-layer, move domain walls by means of electric
+currents parallel to the walls.",1307.0395v3
+2015-07-30,Hierarchical spin-orbital polarisation of a giant Rashba system,"The Rashba effect is one of the most striking manifestations of spin-orbit
+coupling in solids, and provides a cornerstone for the burgeoning field of
+semiconductor spintronics. It is typically assumed to manifest as a
+momentum-dependent splitting of a single initially spin-degenerate band into
+two branches with opposite spin polarisation. Here, combining
+polarisation-dependent and resonant angle-resolved photoemission measurements
+with density-functional theory calculations, we show that the two ""spin-split""
+branches of the model giant Rashba system BiTeI additionally develop disparate
+orbital textures, each of which is coupled to a distinct spin configuration.
+This necessitates a re-interpretation of spin splitting in Rashba-like systems,
+and opens new possibilities for controlling spin polarisation through the
+orbital sector.",1507.08588v1
+2016-10-23,Unusual UUDD magnetic chain structure of the spin-1/2 tetragonally distorted spinel GeCu2O4,"GeCu2O4 exhibits a tetragonal spinel structure due to the strong Jahn-Teller
+distortion associated with Cu2+ ions. We show that its magnetic structure can
+be described as slabs composed of a pair of layers with orthogonally oriented
+spin 1/2 Cu chains in the basal ab plane. The spins between the two layers
+within a slab are collinearly aligned while the spin directions of neighboring
+slabs are perpendicular to each other. Interestingly, we find that spins along
+each chain form an unusual up-up-down-down (UUDD) pattern, suggesting a
+non-negligible nearest-neighbor biquadratic exchange interaction in the
+effective classical spin Hamiltonian. We hypothesize that spin-orbit coupling
+and orbital mixing of Cu2+ ions in this system is non-negligible, which calls
+for future calculations using perturbation theory with extended Hilbert (spin
+and orbital) space and calculations based on density functional theory
+including spin-orbit coupling and looking at the global stability of the UUDD
+state.",1610.07113v1
+2014-03-04,$α$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice,"We examine the role of spin-orbit coupling in the electronic structure of
+$\alpha$-RuCl3, in which Ru ions in 4d5 configuration form a honeycomb lattice.
+The measured optical spectra exhibit a clear optical gap and excitations within
+the t2g orbitals. The spectra can be described very well with first-principles
+electronic structure calculations obtained by taking into account both spin
+orbit coupling and electron correlations. Furthermore, our X-ray absorption
+spectroscopy measurements at the Ru L-edges exhibit distinct spectral features
+associated with the presence of substantial spin- orbit coupling, as well as an
+anomalously large branching ratio. We propose that $\alpha$-RuCl3 is a
+spin-orbit assisted Mott insulator, and the bond-dependent Kitaev interaction
+may be relevant for this compound.",1403.0883v2
+2019-10-30,Excitonic Magnetism at the intersection of Spin-orbit coupling and crystal-field splitting,"Excitonic magnetism involving superpositions of singlet and triplet states is
+expected to arise for two holes in strongly correlated and spin-orbit coupled
+$t_{2g}$ orbitals. However, uncontested material examples for its realization
+are rare. Applying the Variational Cluster Approach to the square lattice, we
+find conventional spin antiferromagnetism combined with orbital order at weak
+and excitonic order at strong spin-orbit coupling. We address the specific
+example of Ca$_2$RuO$_4$ using ab-initio modeling and conclude it to realize
+excitonic magnetism despite its pronounced orbital polarization.",1910.13977v3
+2023-07-17,SOiCISCF: Combining SOiCI and iCISCF for Variational Treatment of Spin-orbit Coupling,"It has recently been shown that the SOiCI approach [J. Phys.: Condens. Matter
+34 (2022) 224007], in conjunction with the spin-separated exact two-component
+relativistic Hamiltonian, can provide very accurate fine structures of systems
+containing heavy elements by treating electron correlation and spin-orbit
+coupling (SOC) on an equal footing. Nonetheless, orbital
+relaxations/polarizations induced by SOC are not yet fully accounted for, due
+to the use of scalar relativistic orbitals. This issue can be resolved by
+further optimizing the still real-valued orbitals self-consistently in the
+presence of SOC, as done in the spin-orbit coupled CASSCF approach [J. Chem.
+Phys. 138 (2013) 104113] but with the iCISCF algorithm [J. Chem. Theory Comput.
+17 (2021) 7545] for large active spaces. The resulting SOiCISCF employs both
+double group and time reversal symmetries for computational efficiency and
+assignment of target states. The fine structures of $p$-block elements are
+taken as showcases to reveal the efficacy of SOiCISCF.",2307.08219v1
+2015-04-22,Spontaneous Edge Accumulation of Spin Currents in Finite-Size Two-Dimensional Diffusive Spin-Orbit Coupled SFS Heterostructures,"We theoretically study spin and charge currents through finite-size
+two-dimensional $s$-wave superconductor/uniform ferromagnet/s-wave
+superconductor (SFS) junctions with intrinsic spin-orbit interactions (ISOIs)
+using a quasiclassical approach. Considering experimentally realistic
+parameters, we demonstrate that the combination of spontaneously broken
+time-reversal symmetry and lack of inversion symmetry can result in
+spontaneously accumulated spin currents at the edges of finite-size
+two-dimensional magnetic SF hybrids. Due to the spontaneous edge spin
+accumulation, the corners of the F wire host the maximum spin current density.
+We further reveal that this type edge phenomena are robust and independent of
+either the actual type of ISOIs or exchange field orientation. Moreover, we
+study spin current-phase relations in these diffusive spin-orbit coupled SFS
+junctions. Our results unveil net spin currents, not accompanied by charge
+supercurrent, that spontaneously accumulate at the sample edges through a
+modulating superconducting phase difference. Finally, we discuss possible
+experimental implementations to observe these edge phenomena.",1504.05950v1
+2015-09-22,Rare-earth triangular lattice spin liquid: a single-crystal study of YbMgGaO$_{4}$,"YbMgGaO$_{4}$, a structurally perfect two-dimensional triangular lattice with
+odd number of electrons per unit cell and spin-orbit entangled effective
+spin-1/2 local moments of Yb$^{3+}$ ions, is likely to experimentally realize
+the quantum spin liquid ground state. We report the first experimental
+characterization of single crystal YbMgGaO$_{4}$ samples. Due to the spin-orbit
+entanglement, the interaction between the neighboring Yb$^{3+}$ moments depends
+on the bond orientations and is highly anisotropic in the spin space. We carry
+out the thermodynamic and the electron spin resonance measurements to confirm
+the anisotropic nature of the spin interaction as well as to quantitatively
+determine the couplings. Our result is a first step towards the theoretical
+understanding of the possible quantum spin liquid ground state in this system
+and sheds new lights on the search of quantum spin liquids in strong spin-orbit
+coupled insulators.",1509.06766v1
+2024-01-03,"Minimal Model for Chirally Induced Spin Selectivity: Spin-orbit coupling, tunneling and decoherence","Chirally Induced Spin Selectivity (CISS) is a transport phenomenon observed
+in both linear and non-linear regimes, where the spin-orbit coupling (SOC) acts
+as the key driver and electron tunneling serves as the dominant mechanism for
+charge transfer. Despite SOC's inherent time-reversal symmetry (TRS)
+preservation, conventional reciprocity relations limit spin polarization and
+the differential treatment of spin species. In experimental systems, an
+additional factor, spin-independent decoherence, disrupts TRS and reciprocity.
+We introduce decoherence using the Buttiker voltage probe within the scattering
+matrix framework. Our results reveal the importance of under-the-barrier
+decoherence as an order-of-magnitude polarization enhancement mechanism.
+Polarization arises by the disruption of spin precession around the spin-orbit
+magnetic field with a new spin component along the field direction. The
+alignment of polarization depends on interference effects produced by the
+voltage probe. We discuss the connection of our model to a more realistic
+decoherence mechanism in molecular systems.",2401.01994v1
+2007-03-19,Non-equilibrium spin dynamics in a trapped Fermi gas with effective spin-orbit interaction,"We consider a trapped atomic system in the presence of spatially varying
+laser fields. The laser-atom interaction generates a pseudospin degree of
+freedom (referred to simply as spin) and leads to an effective spin-orbit
+coupling for the fermions in the trap. Reflections of the fermions from the
+trap boundaries provide a physical mechanism for effective momentum relaxation
+and non-trivial spin dynamics due to the emergent spin-orbit coupling. We
+explicitly consider evolution of an initially spin-polarized Fermi gas in a
+two-dimensional harmonic trap and derive non-equilibrium behavior of the spin
+polarization. It shows periodic echoes with a frequency equal to the harmonic
+trapping frequency. Perturbations, such as an asymmetry of the trap, lead to
+the suppression of the spin echo amplitudes. We discuss a possible experimental
+setup to observe spin dynamics and provide numerical estimates of relevant
+parameters.",0703500v2
+2007-08-02,Extracting current-induced spins: spin boundary conditions at narrow Hall contacts,"We consider the possibility to extract spins that are generated by an
+electric current in a two-dimensional electron gas with Rashba-Dresselhaus
+spin-orbit interaction (R2DEG) in the Hall geometry. To this end, we discuss
+boundary conditions for the spin accumulations between a spin-orbit coupled
+region and contact without spin-orbit coupling, i.e. a normal two-dimensional
+electron gas (2DEG). We demonstrate that in contrast to contacts that extend
+along the whole sample, a spin accumulation can diffuse into the normal region
+through finite contacts and detected by e.g. ferromagnets. For an
+impedance-matched narrow contact the spin accumulation in the 2DEG is equal to
+the current induced spin accumulation in the bulk of R2DEG up to a
+geometry-dependent numerical factor.",0708.0244v1
+2015-05-29,Theory of spin-orbit induced spin relaxation in functionalized graphene,"We perform a comparative study of the spin relaxation by spin-orbit coupling
+induced from adatoms (hydrogen and fluorine) in graphene. Two methods are
+applied, giving consistent results: a full quantum transport simulation of a
+graphene nanoribbon, and a T-matrix calculation using Green's functions for a
+single adatom in graphene. For hydrogenated graphene the dominant spin-orbit
+term for spin relaxation is PIA, the hitherto neglected interaction due to
+pseudospin inversion asymmetry. In contrast, in fluorinated graphene PIA and
+Rashba couplings destructively interfere, reducing the total spin relaxation
+rate. In this case we also predict a strong deviation from the expected 2:1
+spin relaxation anisotropy for out- and in-plane spin orientations. Our
+findings should be useful to benchmark spin relaxation and weak localization
+experiments of functionalized graphene.",1506.00040v1
+2015-12-18,Interplay between resonant tunneling and spin precession oscillations in all-electric all-semiconductor spin transistors,"We investigate the transmission properties of a spin transistor coupled to
+two quantum point contacts acting as spin injector and detector. In the
+Fabry-Perot regime, transport is mediated by quasibound states formed between
+tunnel barriers. Interestingly, the spin-orbit interaction of the Rashba type
+can be tuned in such a way that nonuniform Rashba fields can point along
+distinct directions in different points of the sample. We discuss both
+spin-conserving and spin-flipping transitions as the spin-orbit angle of
+orientation increases from parallel to antiparallel configurations. Spin
+precession oscillations are clearly seen as a function of the length of the
+central channel. Remarkably, we find that these oscillations combine with the
+Fabry-Perot motion giving rise to quasiperiodic transmissions in the purely
+one-dimensional case. Furthermore, we consider the more realistic case of a
+finite width in the transverse direction and find that the coherent
+oscillations become deteriorated for moderate values of the spin-orbit
+strength. Our results then determine the precise role of the Rashba
+intersubband coupling potential in the Fabry-Perot-Datta-Das intermixed
+oscillations.",1512.05958v2
+2021-01-22,Chiral Bloch states in single layer graphene with Rashba spin-orbit coupling: Spectrum and spin current density,"We study the Bloch spectrum and spin physics of 2D massless Dirac electrons
+in single layer graphene subject to a one dimensional periodic Kronig-Penney
+potential and Rashba spin-orbit coupling. The Klein paradox exposes novel
+features in the band dispersion and in graphene spintronics. In particular it
+is shown that: (1) The Bloch energy dispersion $\veps(p)$ has unusual
+structure: There are {\it two Dirac points} at Bloch momenta $\pm p \ne 0$ and
+a narrow band emerges between the wide valence and conduction bands. (2) The
+charge current and the spin density vector vanish. (3) Yet, all the
+non-diagonal elements of the spin current density tensor are finite and their
+magnitude increases linearly with the spin-orbit strength. In particular, there
+is a spin density current whose polarization is perpendicular to the graphene
+plane. (4) The spin density currents are space-dependent, hence their
+continuity equation includes a finite spin torque density.",2101.09224v1
+2012-11-05,First Law of Mechanics for Black Hole Binaries with Spins,"We use the canonical Hamiltonian formalism to generalize to spinning point
+particles the first law of mechanics established for binary systems of
+non-spinning point masses moving on circular orbits [Le Tiec, Blanchet, and
+Whiting, Phys. Rev. D 85, 064039 (2012)]. We find that the redshift observable
+of each particle is related in a very simple manner to the canonical
+Hamiltonian and, more generally, to a class of Fokker-type Hamiltonians. Our
+results are valid through linear order in the spin of each particle, but hold
+also for quadratic couplings between the spins of different particles. The
+knowledge of spin effects in the Hamiltonian allows us to compute spin-orbit
+terms in the redshift variable through 2.5PN order, for circular orbits and
+spins aligned or anti-aligned with the orbital angular momentum. To describe
+extended bodies such as black holes, we supplement the first law for spinning
+point-particle binaries with some ""constitutive relations"" that can be used for
+diagnosis of spin measurements in quasi-equilibrium initial data.",1211.1060v2
+2014-11-12,Spin transport in intermediate-energy heavy-ion collisions as a probe of in-medium spin-orbit interactions,"The spin up-down splitting of collective flows in intermediate-energy
+heavy-ion collisions as a result of the nuclear spin-orbit interaction is
+investigated within a spin- and isospin-dependent Boltzmann-Uehing-Uhlenbeck
+transport model SIBUU12. Using a Skyrme-type spin-orbit coupling quadratic in
+momentum, we found that the spin splittings of the directed flow and elliptic
+flow are largest in peripheral Au+Au collisions at beam energies of about
+100-200 MeV/nucleon, and the effect is considerable even in smaller systems
+especially for nucleons with high transverse momenta. The collective flows of
+light clusters of different spin states are also investigated using an improved
+dynamical coalescence model with spin. Our study can be important in
+understanding the properties of in-medium nuclear spin-orbit interactions once
+the spin-dependent observables proposed in this work can be measured.",1411.3057v2
+2017-06-19,Spin Hall effect from hybridized 3$d$-4$p$ orbitals,"Electrical manipulation of magnetization by spin-orbit torque (SOT) has shown
+promise for realizing reliable magnetic memories and oscillators. To date, the
+generation of transverse spin current and SOT, whether it is of spin Hall
+effect (SHE), Rashba-Edelstein effect or spin-momentum locking origin, relies
+primarily on materials or heterostructures containing 5$d$ or 6$p$ heavy
+elements with strong spin-orbit coupling. Here we show that a paramagnetic CoGa
+compound possesses large enough spin Hall angle to allow robust SOT switching
+of perpendicularly-magnetized ferrimagnetic MnGa films in CoGa/MnGa/Oxide
+heterostructures. The spin Hall efficiency estimated via spin Hall
+magnetoresistance and harmonic Hall measurements is +0.05$\pm$0.01, which is
+surprisingly large for a system that does not contain any heavy metal element.
+First-principles calculations corroborate our experimental observations and
+suggest that the hybridized Co 3$d$ - Ga 4$p$ orbitals along R-X in the
+Brillouin zone is responsible for the intrinsic SHE. Our results suggest that
+efficient spin current generation can be realized in intermetallic by alloying
+a transition metal with a $p$-orbital element and by Fermi level tuning.",1706.05846v1
+2005-08-03,Spin filter using a semiconductor quantum ring side-coupled to a quantum wire,"We introduce a new spin filter based on spin-resolved Fano resonances due to
+spin-split levels in a quantum ring (QR) side-coupled to a quantum wire (QW).
+Spin-orbit coupling inside the QR, together with external magnetic fields,
+induces spin splitting, and the Fano resonances due to the spin-split levels
+result in perfect or considerable suppression of the transport of either spin
+direction. Using the numerical renormalization group method, we find that the
+Coulomb interaction in the QR enhances the spin filter operation by widening
+the separation between dips in conductances for different spins and by allowing
+perfect blocking for one spin direction and perfect transmission for the other.
+The spin-filter effect persists as long as the temperature is less than the
+broadening of QR levels due to the QW-QR coupling. We discuss realistic
+conditions for the QR-based spin filter and its advantages to other similar
+devices.",0508099v1
+2021-06-23,Correlation Between Spin and Orbital Dynamics During Laser-Induced Femtosecond Demagnetization,"Spin and orbital angular momenta are two intrinsic properties of an electron
+and are responsible for the physics of a solid. How the spin and orbital evolve
+with respect to each other on several hundred femtoseconds is largely unknown,
+but it is at the center of laser-induced ultrafast demagnetization. In this
+paper, we introduce a concept of the spin-orbital correlation diagram, where
+spin angular momentum is plotted against orbital angular momentum, much like
+the position-velocity phase diagram in classical mechanics. We use four sets of
+highly accurate time-resolved x-ray magnetic circular dichroism (TR-XMCD) data
+to construct four correlation diagrams for iron and cobalt. To our surprise, a
+pattern emerges. The trace on the correlation diagram for iron is an arc, and
+at the end of demagnetization, it has a pronounced cusp. The correlation
+diagram for cobalt is different and appears more linear, but with kinks. We
+carry out first-principles calculations with two different methods:
+time-dependent density functional theory (TDDFT) and time-dependent Liouville
+density functional theory (TDLDFT). These two methods agree that the
+experimental findings for both Fe and Co are not due t experimental errors. It
+is the spin-orbit coupling that correlates the spin dynamics to the orbital
+dynamics.Microscopically, Fe and Co have different orbital occupations, which
+leads to distinctive correlation diagrams. We believe that this correlation
+diagram presents a useful tool to better understand spin and orbital dynamics
+on an ultrafast time scale. A brief discussion on the magnetic anisotropy
+energy is also provided.",2106.12679v1
+2010-12-07,Reducing orbital eccentricity of precessing black-hole binaries,"Building initial conditions for generic binary black-hole evolutions without
+initial spurious eccentricity remains a challenge for numerical-relativity
+simulations. This problem can be overcome by applying an eccentricity-removal
+procedure which consists in evolving the binary for a couple of orbits,
+estimating the eccentricity, and then correcting the initial conditions. The
+presence of spins can complicate this procedure. As predicted by post-Newtonian
+theory, spin-spin interactions and precession prevent the binary from moving
+along an adiabatic sequence of spherical orbits, inducing oscillations in the
+radial separation and in the orbital frequency. However, spin-induced
+oscillations occur at approximately twice the orbital frequency, therefore they
+can be distinguished from the initial spurious eccentricity, which occurs at
+approximately the orbital frequency. We develop a new removal procedure based
+on the derivative of the orbital frequency and find that it is successful in
+reducing the eccentricity measured in the orbital frequency to less than 0.0001
+when moderate spins are present. We test this new procedure using
+numerical-relativity simulations of binary black holes with mass ratios 1.5 and
+3, spin magnitude 0.5 and various spin orientations. The numerical simulations
+exhibit spin-induced oscillations in the dynamics at approximately twice the
+orbital frequency. Oscillations of similar frequency are also visible in the
+gravitational-wave phase and frequency of the dominant mode.",1012.1549v2
+2009-07-23,Spin-orbit fields in ferromagnetic metal/semiconductor junctions,"The methodology used to obtain the values of the spin-orbit couplings from
+the spin expectation values from perturbation theory was incorrect. As a result
+Figs. 2 and 3 are incorrect.",0907.4149v3
+2004-02-28,Resonant Spin Hall Conductance in Two-Dimensional Electron Systems with Rashba Interaction in a Perpendicular Magnetic Field,"We study transport properties of a two-dimensional electron system with
+Rashba spin-orbit coupling in a perpendicular magnetic field. The spin orbit
+coupling competes with Zeeman splitting to introduce additional degeneracies
+between different Landau levels at certain magnetic fields. This degeneracy, if
+occuring at the Fermi level, gives rise to a resonant spin Hall conductance,
+whose height is divergent as 1/T and whose weight is divergent as $-\ln T$ at
+low temperatures. The Hall conductance is unaffected by the Rashba coupling.",0403005v1
+2006-12-12,Spin-orbit induced spin-qubit control in nanowires,"We elaborate on a number of issues concerning our recent proposal for
+spin-qubit manipulation in nanowires using the spin-orbit coupling. We discuss
+the experimental status and describe in further detail the scheme for
+single-qubit rotations. We present a derivation of the effective two-qubit
+coupling which can be extended to higher orders in the Coulomb interaction. The
+analytic expression for the coupling strength is shown to agree with numerics.",0612293v1
+2007-01-25,Spin-polarization coupling in multiferroic transition-metal oxides,"A systematic microscopic theory of magnetically induced ferroelectricity and
+lattice modulation is presented for all electron configurations of
+Mott-insulating transition-metal oxides. Various mechanisms of polarization are
+identified in terms of a strong-coupling perturbation theory. Especially, the
+spin-orbit interaction acting on the ligand p orbitals is shown to give the
+ferroelectric polarization of the spin-current form, which plays a crucial role
+particularly in eg systems. Semiquantitative agreements with the multiferroic
+TbMnO3 are obtained. Predictions for X-ray and neutron scattering experiments
+are proposed to clarify the microscopic mechanism of the spin-polarization
+coupling in different materials.",0701614v1
+2012-09-19,Spin-orbit coupling assisted by flexural phonons in graphene,"We analyze the couplings between spins and phonons in graphene. We present a
+complete analysis of the possible couplings between spins and flexural, out of
+plane, vibrations. From tight-binding models we obtain analytical and numerical
+estimates of their strength. We show that dynamical effects, induced by quantum
+and thermal fluctuations, significantly enhance the spin-orbit gap.",1209.4382v2
+2016-09-21,Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces,"The spin-orbit interaction couples the electrons' motion to their spin.
+Accordingly, passing a current in a material with strong spin-orbit coupling
+generates a transverse spin current (spin Hall effect, SHE) and vice-versa
+(inverse spin Hall effect, ISHE). The emergence of SHE and ISHE as
+charge-to-spin interconversion mechanisms offers a variety of novel spintronics
+functionalities and devices, some of which do not require any ferromagnetic
+material. However, the interconversion efficiency of SHE and ISHE (spin Hall
+angle) is a bulk property that rarely exceeds ten percent, and does not take
+advantage of interfacial and low-dimensional effects otherwise ubiquitous in
+spintronics hetero- and mesostructures. Here, we make use of an
+interface-driven spin-orbit coupling mechanism - the Rashba effect - in the
+oxide two-dimensional electron system (2DES) LaAlO3/SrTiO3 to achieve
+spin-to-charge conversion with unprecedented efficiency. Through spin-pumping,
+we inject a spin current from a NiFe film into the oxide 2DES and detect the
+resulting charge current, which can be strongly modulated by a gate voltage. We
+discuss the amplitude of the effect and its gate dependence on the basis of the
+electronic structure of the 2DES.",1609.06464v1
+2003-10-27,Orbital and spin moment in CoO,"The orbital and spin moment of the Co2+ ion in CoO has been calculated within
+the quasi-atomic approach with taking into account the intra-atomic spin-orbit
+coupling and crystal field interactions. The orbital moment of 1.38 m_B amounts
+at 0 K, in the magnetically-ordered state, to more than 34% of the total moment
+4.02 m_B and yields the L/S ratio of 1.04, close to the recent experimental
+value. This paper has been motivated by a recent paper in Phys. Rev. B 65
+(2002) 125111, in which a presented theoretical approach was unable to
+calculate the orbital moment.
+  PACS No: 71.70.E; 75.10.D
+  Keywords: crystal field, spin-orbit coupling, orbital moment, CoO",0310622v2
+2003-08-01,Orbital evolution of a particle around a black hole: II. Comparison of contributions of spin-orbit coupling and the self force,"We consider the evolution of the orbit of a spinning compact object in a
+quasi-circular, planar orbit around a Schwarzschild black hole in the extreme
+mass ratio limit. We compare the contributions to the orbital evolution of both
+spin-orbit coupling and the local self force. Making assumptions on the
+behavior of the forces, we suggest that the decay of the orbit is dominated by
+radiation reaction, and that the conservative effect is typically dominated by
+the spin force. We propose that a reasonable approximation for the
+gravitational waveform can be obtained by ignoring the local self force, for
+adjusted values of the parameters of the system. We argue that this
+approximation will only introduce small errors in the astronomical
+determination of these parameters.",0308003v1
+2020-07-14,"Role of orbital off-diagonal spin and charge condensates in a three orbital model for $\rm Ca_2RuO_4$ -- Coulomb renormalized spin-orbit coupling, orbital moment, and tunable magnetic order","Strongly anisotropic spin-orbit coupling (SOC) renormalization and strongly
+enhanced orbital magnetic moments are obtained in the fully self consistent
+approach including the orbital off-diagonal spin and charge condensates. For
+moderate tetragonal distortion as in $\rm Ca_2 RuO_4$, dominantly planar
+antiferromagnetic (AFM) order with small canting of moments in and about the
+crystal $c$ axis are obtained. For reduced tetragonal distortion, we find a
+tunable regime wherein the magnetic order can be tuned (AFM or FM) by the bare
+SOC strength and octahedral tilting magnitude. In this regime, with decreasing
+tetragonal distortion, AFM order is maintained by progressively decreasing
+octahedral tilting, as observed in $\rm Ca_{2-x}Sr_x RuO_4$. For purely planar
+order, the only self consistent solution is FM order along crystal $b$ axis,
+which is relevant for the bilayer ruthenate compound $\rm Ca_3 Ru_2 O_7$.",2007.06978v2
+2012-06-26,Transport and semiclassical dynamics of coupled quantum dots interacting with a local magnetic moment,"We present a theory of magnetotransport through a system of two coupled
+electronic orbitals, where the electron spin interacts with a (large) local
+magnetic moment via an exchange interaction. For the physical realization of
+such a set-up we have in mind, for example, semiconductor quantum dots coupled
+to an ensemble of nuclear spins in the host material or molecular orbitals
+coupled to a local magnetic moment. Using a semiclassical approximation, we
+derive a set of Ehrenfest equations of motion for the electron density matrix
+and the mean value of the external spin (Landau equations): Due to the spin
+coupling they turn out to be nonlinear and, importantly, also coherences
+between electron states with different spin directions need to be considered.
+The electronic spin-polarized leads are implemented in form of a Lindblad-type
+dissipator in the infinite bias limit. We have solved this involved dynamical
+system numerically for various isotropic and anisotropic coupling schemes. For
+isotropic spin coupling and spin-polarized leads we study the effect of
+current-induced magnetization of the attached spin and compare this with a
+single quantum dot set-up. We further demonstrate that an anisotropic coupling
+can lead to a rich variety of parametric oscillations in the average current
+reflecting the complicated interplay between the Larmor precession of the
+external spin and the dissipative coherent dynamics of the electron spin.",1206.5994v2
+2004-04-29,Strongly-correlated crystal-field approach to 3d oxides - the orbital magnetism in 3d-ion compounds,"We have developed the crystal-field approach with strong electron
+correlations, extended to the Quantum Atomistic Solid-State theory (QUASST), as
+a physically relevant theoretical model for the description of electronic and
+magnetic properties of 3d-atom compounds. Its applicability has been
+illustrated for LaCoO3, FeBr2 and Na2V3O7. According to the QUASST theory in
+compounds containing open 3d-/4f-/5f-shell atoms the discrete atomic-like
+low-energy electronic structure survives also when the 3d atom becomes the full
+part of a solid matter. This low-energy atomic-like electronic structure, being
+determined by local crystal-field interactions and the intra-atomic spin-orbit
+coupling, predominantly determines electronic and magnetic properties of the
+whole compound.
+  We understand our theoretical research as a continuation of the Van Vleck's
+studies on the localized magnetism. We point out, however, the importance of
+the orbital magnetism and the intra-atomic spin-orbit coupling for the
+physically adequate description of real 3d-ion compounds and 3d magnetism. Our
+studies clearly indicate that it is the highest time to ''unquench'' the
+orbital moment in solid-state physics in description of 3d-atom containing
+compounds.
+  PACS No: 75.10.D; 71.70.E
+  Keywords: magnetism, transition-metal compounds, 3d magnetism, crystal field,
+spin-orbit coupling, orbital magnetism",0404713v1
+2010-07-21,Spin and orbital fluctuations in non-equilibrium transport through quantum dots: A renormalisation-group analysis,"We study non-equilibrium current and occupation probabilities of a
+two-orbital quantum dot. The couplings to the leads are allowed to be
+asymmetric and orbital dependent as it is generically the case in transport
+experiments on molecules and nanowires. Starting from a two-orbital Anderson
+model, we perform a generalised Schrieffer-Wolff transformation to derive an
+effective Kondo model. This generates an orbital potential scattering
+contribution which is of the same order as the spin exchange interaction. In a
+first perturbative analysis we identify a regime of negative differential
+conductance and a cascade resonance in the presence of an external magnetic
+field, which both originate from the non-equilibrium occupation of the
+orbitals. We then study the logarithmic enhancement of these signatures by
+means of a renormalisation-group treatment. We find that the orbital potential
+scattering qualitatively changes the renormalisation of the spin exchange
+couplings and strongly affects the differential conductance for asymmetric
+couplings.",1007.3605v2
+2014-03-05,Scattering theory of spin-orbit active adatoms on graphene,"The scattering of two-dimensional massless Dirac fermions from local
+spin-orbit interactions with an origin in dilute concentrations of physisorbed
+atomic species on graphene is theoretically investigated. The hybridization
+between graphene and the adatoms' orbitals lifts spin and valley degeneracies
+of the pristine host material, giving rise to rich spin-orbit coupling
+mechanisms with features determined by the exact adsorption position on the
+honeycomb lattice - bridge, hollow or top position - and the adatoms'
+outer-shell orbital type. Effective graphene-only Hamiltonians are derived from
+symmetry considerations, while a microscopic tight-binding approach connects
+effective low-energy couplings and graphene-adatom hybridization parameters.
+Within the $T$-matrix formalism, a theory for (spin-dependent) scattering
+events involving graphene's charge carriers, and the spin-orbit active adatoms
+is developed. Spin currents associated with intravalley and intervalley
+scattering are found to tend to oppose each other. We establish that under
+certain conditions, hollow-position adatoms give rise to the spin Hall effect,
+through skew scattering, while top-position adatoms induce transverse charge
+currents via trigonal potential scattering. We also identify the critical Fermi
+energy range where the spin Hall effect is dramatically enhanced, and the
+associated transverse spin currents can be reversed.",1403.1251v2
+1998-02-13,Spin and orbital excitations in magnetic insulators with Jahn-Teller ions,"The elementary excitations of a model Hamiltonian that captures the low
+energy behavior of a simple two-fold degenerate Hubbard Hamiltonian with Hund's
+rule coupling, is studied. The phase diagram in the mean-field limit and in a
+two-site approach reveals a rich variety of phases where both the orbital and
+the spin degrees of freedom are ordered. We show that besides usual spin waves
+(magnons) there exist also orbital waves (orbitons) and, most interestingly, in
+a completely ferromagnetically coupled system, a combined spin-orbital
+excitation which can be visualized as a bound state of magnons and orbitons.
+For a completely degenerate system the bound states are found to be the lowest
+lying elementary excitations, both in one- and two-dimensions. Finally we
+extend our treatment to almost-degenerate systems. This can serve as an example
+that the elementary excitations in orbitally degenerate strongly correlated
+electron systems in general carry both spin and orbital character.",9802146v1
+2007-01-09,Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot,"We demonstrate control of the electron number down to the last electron in
+tunable few-electron quantum dots defined in catalytically grown InAs
+nanowires. Using low temperature transport spectroscopy in the Coulomb blockade
+regime we propose a simple method to directly determine the magnitude of the
+spin-orbit interaction in a two-electron artificial atom with strong spin-orbit
+coupling. Due to a large effective g-factor |g*|=8+/-1 the transition from
+singlet S to triplet T+ groundstate with increasing magnetic field is dominated
+by the Zeeman energy rather than by orbital effects. We find that the
+spin-orbit coupling mixes the T+ and S states and thus induces an avoided
+crossing with magnitude $\Delta_{SO}$=0.25+/-0.05 meV. This allows us to
+calculate the spin-orbit length $\lambda_{SO}\approx$127 nm in such systems
+using a simple model.",0701161v1
+2009-11-11,Orbitally controlled Kondo effect of Co ad-atoms on graphene,"Based on ab-initio calculations we identify possible scenarios for the Kondo
+effect due to Co ad-atoms on graphene. General symmetry arguments show that for
+magnetic atoms in high-symmetry positions, the Kondo effect in graphene is
+controlled not only by the spin but also by the orbital degree of freedom. For
+a Co atom absorbed on top of a carbon atom, the Kondo effect is quenched by
+spin-orbit coupling below an energy scale of $\sim 15$\,K. For Co with spin
+$S=1/2$ located in the center of a hexagon, an SU(4) Kondo model describes the
+entanglement of orbital moment and spin at higher energies, while below \sim
+60$\,meV spin-orbit coupling leads to a more conventional SU(2) Kondo effect.
+The interplay of the orbital Co physics and the peculiar band-structure of
+graphene is directly accessible in Fourier transform tunneling spectroscopy or
+in the gate-voltage dependence of the Kondo temperature displaying a very
+strong, characteristic particle-hole asymmetry.",0911.2103v2
+2011-03-21,Spin-orbit coupling and the conservation of angular momentum,"In nonrelativistic quantum mechanics, the total (i.e. orbital plus spin)
+angular momentum of a charged particle with spin that moves in a Coulomb plus
+spin-orbit-coupling potential is conserved. In a classical nonrelativistic
+treatment of this problem, in which the Lagrange equations determine the
+orbital motion and the Thomas equation yields the rate of change of the spin,
+the particle's total angular momentum in which the orbital angular momentum is
+defined in terms of the kinetic momentum is generally not conserved. However, a
+generalized total angular momentum, in which the orbital part is defined in
+terms of the canonical momentum, is conserved. This illustrates the fact that
+the quantum-mechanical operator of momentum corresponds to the canonical
+momentum of classical mechanics.",1103.4092v3
+2014-07-13,A Renormalization-Group Study of the Symmetry-Breaking Order Parameters in Spin-Orbit Coupled Iridates and Related Systems,"We study the competition between various forms of density-wave-like order
+parameters that may arise in multi-orbital correlated materials with strong
+spin-orbit coupling (SOC) within a renormalization-group (RG) approach. The
+calculations are restricted to models with two spin-orbit split bands having
+strong inter-band Fermi surface nesting. We find that for such Fermi surface
+topology, the interplay between the inter-band nesting and SOC strongly
+enhances the inter-orbital Coulomb interaction (relative to other interactions)
+as the system approaches a stable fixed point. This results in an exotic
+spin-orbit density wave (SODW) to become the energetically favorable
+symmetry-broken state. While the conclusions are generic to such a Fermi
+surface topology, the band structure and the numerical results are presented
+for the iridate systems. We also find that the electronic fingerprints of the
+SODW are in better agreement with various experimental results than a
+conventional spin density wave (SDW), explaining the long-standing problem of
+the origin of the metal-insulator transition in these systems.",1407.3440v1
+2020-07-19,Interfacial Dzyaloshinskii-Moriya interaction and spin-orbit torque in Au1-xPtx/Co bilayers with varying interfacial spin-orbit coupling,"The quantitative roles of the interfacial spin-orbit coupling (SOC) in
+Dzyaloshinskii-Moriya interaction (DMI) and dampinglike spin-orbit torque
+({\tau}DL) have remained unsettled after a decade of intensive study. Here, we
+report a conclusive experiment evidence that, because of the critical role of
+the interfacial orbital hybridization, the interfacial DMI is not necessarily a
+linear function of the interfacial SOC, e.g. at Au1-xPtx/Co interfaces where
+the interfacial SOC can be tuned significantly via strongly composition
+(x)-dependent spin-orbit proximity effect without varying the bulk SOC and the
+electronegativity of the Au1-xPtx layer. We also find that {\tau}DL in the
+Au1-xPtx/Co bilayers varies distinctly from the interfacial SOC as a function
+of x, indicating no important {\tau}DL contribution from the interfacial
+Rashba-Edelstein effect.",2007.09817v2
+2018-08-16,Gigantic intrinsic orbital Hall effects in weakly spin-orbit coupled metals,"A recent paper [Go $\textit{et al}$., Phys. Rev. Lett. $\textbf{121}$, 086602
+(2018)] proposed that the intrinsic orbital Hall effect (OHE) can emerge from
+momentum-space orbital texture in centrosymmetric materials. In searching for
+real materials with strong OHE, we investigate the intrinsic OHE in metals with
+small spin-orbit coupling (SOC) in face-centered cubic and body-centered cubic
+structures (Li, Al, V, Cr, Mn, Ni, and Cu). We find that orbital Hall
+conductivities (OHCs) in these materials are gigantic $\sim 10^3-10^4\
+(\hbar/e)(\Omega\cdot\mathrm{cm})^{-1}$, which are comparable or larger than
+spin Hall conductivity (SHC) of Pt. Although SHCs in these materials are
+smaller than OHCs due to small SOC, we found that SHCs are still sizable and
+the spin Hall angles may be of the order of 0.1. We discuss implications on
+recent spin-charge interconversion experiments on materials having small SOC.",1808.05546v3
+2020-10-19,Human psychophysical discrimination of spatially dependant Pancharatnam-Berry phases in optical spin-orbit states,"We tested the ability of human observers to discriminate distinct profiles of
+spatially dependant geometric phases when directly viewing stationary
+structured light beams. Participants viewed polarization coupled orbital
+angular momentum (OAM) states, or ``spin-orbit'' states, in which the OAM was
+induced through Pancharatnam-Berry phases. The coupling between polarization
+and OAM in these beams manifests as spatially dependant polarization. Regions
+of uniform polarization are perceived as specifically oriented Haidinger's
+brushes, and study participants discriminated between two spin-orbit states
+based on the rotational symmetry in the spatial orientations of these brushes.
+Participants used self-generated eye movements to prevent adaptation to the
+visual stimuli. After initial training, the participants were able to correctly
+discriminate between two spin-orbit states, differentiated by OAM $=\pm1$, with
+an average success probability of $69\%$ ($S.D. = 22\%$, $p = 0.013$). These
+results support our previous observation that human observers can directly
+perceive spin-orbit states, and extend this finding to non-rotating beams, OAM
+modes induced via Pancharatnam-Berry phases, and the discrimination of states
+that are differentiated by OAM.",2010.09619v1
+2020-05-30,Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet,"Spin transport was studied in a two-dimensional electron gas hosted in a wide
+GaAs quantum well occupying two subbands. Using space and time Kerr rotation
+microscopy to image drifting spin packets under an in-plane accelerating
+electric field, optical injection and detection of spin polarization were
+achieved in a pump-probe configuration. The experimental data exhibited high
+spin mobility and long spin lifetimes allowing to obtain the spin-orbit fields
+as a function of the spin velocities. Surprisingly, above moderate electric
+fields of 0.4V/cm with velocities higher than 2$\mu$m/ns, we observed a
+dependence of both bulk and structure-related spin-orbit interactions on the
+velocity magnitude. A remarkable feature is the increase of the cubic
+Dresselhaus term to approximately half of the linear coupling when the velocity
+is raised to 10$\mu$m/ns. In contrast, the Rashba coupling for both subbands
+decreases to about half of its value in the same range. These results yield new
+information for the application of drift models in spin-orbit fields and about
+limitations for the operation of spin transistors.",2006.00309v2
+2022-04-26,Probing details of spin--orbit coupling through Pauli spin blockade,"Spin--orbit interaction (SOI) plays a fundamental role in many
+low-dimensional semiconductor and hybrid quantum devices. In the rapidly
+evolving field of semiconductor spin qubits, SOI is an essential ingredient
+that can allow for ultrafast qubit control. The exact manifestation of SOI in a
+given device is, however, often both hard to predict theoretically and probe
+experimentally. Here, we develop a detailed theoretical connection between the
+leakage current through a double quantum dot in Pauli spin blockade and the
+underlying SOI in the system. We present a general analytic expression for the
+leakage current, which allows to connect experimentally observable features to
+both the magnitude and orientation of the effective spin--orbit field acting on
+the moving carriers. Motivated by the large recent interest in hole-based
+quantum devices, we further zoom in on the case of Pauli blockade of hole
+spins, assuming a strong transverse confinement potential. In this limit we
+also find an analytic expression for the current at low external magnetic
+field, that includes the effect of hyperfine coupling of the hole spins to
+randomly fluctuating nuclear spin baths. This result can be used to extract
+detailed information about both hyperfine and spin--orbit coupling parameters
+for hole spins in devices with a significant fraction of non-zero nuclear
+spins.",2204.12546v1
+2017-07-10,Theory of in-plane current induced spin torque in metal/ferromagnet bilayers,"Using a semiclassical approach that simultaneously incorporates the spin Hall
+effect (SHE), spin diffusion, quantum well states, and interface spin-orbit
+coupling (SOC), we address the interplay of these mechanisms as the origin of
+the in-plane current induced spin torque observed in the normal
+metal/ferromagnetic metal bilayer thin films. Focusing on the bilayers with a
+ferromagnet much thinner than its spin diffusion length, such as Pt/Co with
+$\sim 10$nm thickness, our approach addresses simultaneously the two
+contributions to the spin torque, namely the spin-transfer torque (SHE-STT) due
+to SHE induced spin injection, and the spin-orbit torque (SOT) due to SOC
+induced spin accumulation. The SOC produces an effective magnetic field at the
+interface, hence it modifies the angular momentum conservation expected for the
+SHE-STT. The SHE induced spin voltage and the interface spin current are
+mutually dependent, hence are solved in a self-consistent manner. In addition,
+the spin transport mediated by the quantum well states may be responsible for
+the experimentally observed rapid variation of the spin torque with respect to
+the thickness of the ferromagnet.",1707.02771v1
+2013-07-17,"Anisotropic Quantum Spin Hall Effect, Spin-Orbital Textures and Mott Transition","We investigate the interplay between topological effects and Mott physics in
+two dimensions on a graphene-like lattice, via a tight-binding model containing
+an anisotropic spin-orbit coupling on the next-nearest-neighbour links and the
+Hubbard interaction. We thoroughly analyze the resulting phases, namely a
+topological band insulator phase or anisotropic quantum Spin Hall phase until
+moderate interactions, a N\'eel and Spiral phase at large interactions in the
+Mott regime, as well as the formation of a spin-orbital texture in the bulk at
+the Mott transition. The emergent magnetic orders at large interactions are
+analyzed through a spin wave analysis and mathematical arguments. At weak
+interactions, by analogy with the Kane-Mele model, the system is described
+through a Z_2 topological invariant. In addition, we describe how the
+anisotropic spin-orbit coupling already produces an exotic spin texture at the
+edges. The physics at the Mott transition is described in terms of a U(1) slave
+rotor theory. Taking into account gauge fluctuations around the mean-field
+saddle point solution, we show how the spin texture now proliferates into the
+bulk above the Mott critical point. The latter emerges from the response of the
+spinons under the insertion of monopoles and this becomes more pronounced as
+the spin-orbit coupling becomes prevalent. We discuss implications of our
+predictions for thin films of the iridate compound Na2IrO3 and also
+graphene-like systems.",1307.4597v2
+2015-08-31,Interaction driven exotic quantum phases in spin-orbit coupled spin$-1$ bosons,"We study the interplay between large-spin, spin-orbit coupling, and
+superfluidity for bosons in a two dimensional optical lattice, focusing on the
+spin-1 spin-orbit coupled system recently realized at the Joint Quantum
+Institute [Campbell et. al., arXiv:1501.05984]. We find a rich quantum phase
+diagram, where, in addition to the conventional phases ---superfluid and
+insulator--- contained in the spin-$1$ Bose-Hubbard model, there are new
+lattice symmetry breaking phases. For weak interactions, the interplay between
+two length scales, the lattice momentum and the spin-orbit wave-vector induce a
+phase transition from a uniform superfluid to a phase where bosons
+simultaneously condense at the center and edge of the Brillouin zone at a
+non-zero spin-orbit strength. This state is characterized by spin density wave
+order, which arises from the spin-$1$ nature of the system. Interactions
+suppress spin density wave order, and favor a superfluid \textit{only} at the
+Brillouin zone edge. This state has spatially oscillating mean field order
+parameters, but a homogeneous density. We show that the spin density wave
+superfluid phase survives in a two dimensional harmonic trap, and thus
+establish that our results are directly applicable to experiments on $^{87}$Rb,
+$^7$Li, and $^{41}$K.",1509.00005v2
+2015-01-03,Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions,"The rapid experimental progress of ultra-cold dipolar fermions opens up a
+whole new opportunity to investigate novel many-body physics of fermions. In
+this article, we review theoretical studies of the Fermi liquid theory and
+Cooper pairing instabilities of both electric and magnetic dipolar fermionic
+systems from the perspective of unconventional symmetries. When the electric
+dipole moments are aligned by the external electric field, their interactions
+exhibit the explicit $d_{r^2-3z^2}$ anisotropy. The Fermi liquid properties,
+including the single-particle spectra, thermodynamic susceptibilities, and
+collective excitations, are all affected by this anisotropy. The electric
+dipolar interaction provides a mechanism for the unconventional spin triplet
+Cooper pairing, which is different from the usual spin-fluctuation mechanism in
+solids and the superfluid $^3$He. Furthermore, the competition between pairing
+instabilities in the singlet and triplet channels gives rise to a novel
+time-reversal symmetry breaking superfluid state. Unlike electric dipole
+moments which are induced by electric fields and unquantized, magnetic dipole
+moments are intrinsic proportional to the hyperfine-spin operators with a Lande
+factor. Its effects even manifest in unpolarized systems exhibiting an
+isotropic but spin-orbit coupled nature. The resultant spin-orbit coupled Fermi
+liquid theory supports a collective sound mode exhibiting a topologically
+non-trivial spin distribution over the Fermi surface. It also leads to a novel
+$p$-wave spin triplet Cooper pairing state whose spin and orbital angular
+momentum are entangled to the total angular momentum $J=1$ dubbed the
+$J$-triplet pairing. This $J$-triplet pairing phase is different from both the
+spin-orbit coupled $^3$He-$B$ phase with $J=0$ and the spin-orbit decoupled
+$^3$He-$A$ phase.",1501.00540v1
+2003-11-03,Dissipationless Spin Current in Anisotropic p-Doped Semiconductors,"Recently, dissipationless spin current has been predicted for the p-doped
+semiconductors with spin-orbit coupling. Here we investigate the effect of
+spherical symmetry breaking on the dissipationless spin current, and obtain
+values of the intrinsic spin Hall conductivity for realistic semiconductor band
+structures with cubic symmetry.",0311024v2
+2008-12-09,Spin-Wave Relaxation in a Quantum Hall Ferromagnet,"We study spin wave relaxation in quantum Hall ferromagnet regimes. Spin-orbit
+coupling is considered as a factor determining spin nonconservation, and
+external random potential as a cause of energy dissipation making spin-flip
+processes irreversible. We compare this relaxation mechanism with other
+relaxation channels existing in a quantum Hall ferromagnet.",0812.1703v1
+1999-08-17,Numerical Study of the One-Dimensional Spin-Orbit Coupled System with SU(2)$\otimes$SU(2) Symmetry,"We numerically study the SU(2)$\otimes$SU(2) symmetric spin-orbit coupled
+model as a lower symmetric generalization of the SU(4) exchange model. On the
+symmetric line with respect to the spin and orbit, our result shows the
+essentially singular gap formation in consistent with the analytic approach,
+which is different from the previous numerical calculation. Furthermore, we
+find new critical phases around the SU(4) point, surrounding the previously
+known gapless symmetric line. In these novel phases either spin or orbital
+excitations around momentum $q=\pi$ form massless continua which split from the
+excitations belonging to the $[2^2]$ irreducible representation at the SU(4)
+point. On the critical symmetric line, the additional coupled spin-orbit
+excitations around $q=\pi/2$ originating from [$2^11^2$] become critical, too.",9908237v1
+2002-06-19,Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport,"In situ control of spin-orbit coupling in coherent transport using a clean
+GaAs/AlGaAs 2DEG is realized, leading to a gate-tunable crossover from weak
+localization to antilocalization. The necessary theory of 2D magnetotransport
+in the presence of spin-orbit coupling beyond the diffusive approximation is
+developed and used to analyze experimental data. With this theory the Rashba
+contribution and linear and cubic Dresselhaus contributions to spin-orbit
+coupling are separately estimated, allowing the angular dependence of
+spin-orbit precession to be extracted at various gate voltages.",0206375v4
+2004-10-16,Phase transitions in spin-orbital coupled model for pyroxene titanium oxides,"We study the competing phases and the phase transition phenomena in an
+effective spin-orbital coupled model derived for pyroxene titanium oxides
+ATiSi2O6 (A=Na, Li). Using the mean-field-type analysis and the numerical
+quantum transfer matrix method, we show that the model exhibits two different
+ordered states, the spin-dimer and orbital-ferro state and the spin-ferro and
+orbital-antiferro state. The transition between two phases is driven by the
+relative strength of the Hund's-rule coupling to the onsite Coulomb repulsion
+and/or by the external magnetic field. The ground-state phase diagram is
+determined. There is a keen competition between orbital and spin degrees of
+freedom in the multicritical regime, which causes large fluctuations and
+significantly affects finite-temperature properties in the paramagnetic phase.",0410411v1
+2008-04-21,Anisotropic plasmons in a two-dimensional electron gas with spin-orbit interaction,"Spin-orbit coupling induced anisotropies of plasmon dynamics are investigated
+in two-dimensional semiconductor structures. The interplay of the linear
+Bychkov-Rashba and Dresselhaus spin-orbit interactions drastically affects the
+plasmon spectrum: the dynamical structure factor exhibits variations over
+several decades, prohibiting plasmon propagation in specific directions. While
+this plasmon filtering makes the presence of spin-orbit coupling in plasmon
+dynamics observable, it also offers a control tool for plasmonic devices.
+Remarkably, if the strengths of the two interactions are equal, not only the
+anisotropy, but all the traces of the linear spin-orbit coupling in the
+collective response disappear.",0804.3366v3
+2015-09-14,Spin Orbit Coupling in Graphene Induced by Heavy Adatoms with Electrons in the Outer-Shell $p$ Orbitals,"Many of the exotic properties proposed to occur in graphene rely on the
+possibility of increasing the spin orbit coupling (SOC). By combining
+analytical and numerical tight binding calculations, in this work we study the
+SOC induced by heavy adatoms with active electrons living in $p$ orbitals.
+Depending on the position of the adatoms on graphene different kinds of SOC
+appear. Adatoms located in hollow position induce spin conserving intrinsic
+like SOC whereas a random distribution of adatoms induces a spin flipping
+Rashba like SOC. The induced SOC is linearly proportional to the adatoms
+concentration, indicating the inexistent interference effects between different
+adatoms. By computing the Hall conductivity we have proved the stability of the
+topological quantum Hall phases created by the adatoms against inhomogeneous
+spin orbit coupling . For the case of Pb adatoms, we find that a concentration
+of 0.1 adatom per carbon atom generates SOC's of the order of $\sim$40$meV$.",1509.04024v1
+2017-03-22,Anisotropy of transport in bulk Rashba metals,"The recent experimental discovery of three-dimensional (3D) materials hosting
+a strong Rashba spin-orbit coupling calls for the theoretical investigation of
+their transport properties. Here we study the zero temperature dc conductivity
+of a 3D Rashba metal in the presence of static diluted impurities. We show
+that, at variance with the two-dimensional case, in 3D systems spin-orbit
+coupling affects dc charge transport in all density regimes. We find in
+particular that the effect of spin-orbit interaction strongly depends on the
+direction of the current, and we show that this yields strongly anisotropic
+transport characteristics. In the dominant spin-orbit coupling regime where
+only the lowest band is occupied, the SO-induced conductivity anisotropy is
+governed entirely by the anomalous component of the renormalized current. We
+propose that measurements of the conductivity anisotropy in bulk Rashba metals
+may give a direct experimental assessment of the spin-orbit strength.",1703.07701v2
+2018-05-22,Spin-orbit torque in completely compensated synthetic antiferromagnet,"Synthetic antiferromagnets (SAF) have been proposed to replace ferromagnets
+in magnetic memory devices to reduce the stray field, increase the storage
+density and improve the thermal stability. Here we investigate the spin-orbit
+torque in a perpendicularly magnetized Pt/[Co/Pd]/Ru/[Co/Pd] SAF structure,
+which exhibits completely compensated magnetization and an exchange coupling
+field up to 2100 Oe. The magnetizations of two Co/Pd layers can be switched
+between two antiparallel states simultaneously by spin-orbit torque. The
+magnetization switching can be read out due to much stronger spin-orbit
+coupling at bottom Pt/[Co/Pd] interface compared to its upper counterpart
+without Pt. Both experimental and theoretical analyses unravel that the torque
+efficiency of antiferromagnetic coupled stacks is significantly higher than the
+ferromagnetic counterpart, making the critical switching current of SAF
+comparable to the conventional single ferromagnet. Besides adding an important
+dimension to spin-orbit torque, the efficient switching of completely
+compensated SAF might advance magnetic memory devices with high density, high
+speed and low power consumption.",1805.08486v2
+2023-01-27,Non-Lifshitz invariants corrections to Dzyaloshinskii-Moriya interaction energy,"We study the continuum limit of two-dimensional chiral magnets in which
+Dzyaloshinskii-Moriya interaction (DMI) is due to the interplay between a
+smooth magnetic texture and spin-orbit coupling. The resulting free-energy
+density of the system contains linear terms in the spatial gradient of the
+magnetic texture, which mark an instability of the system towards the formation
+of nontrivial magnetic orders such as skyrmions or chiral domain walls. We
+perform a microscopic analysis of DMI tensors responsible for this contribution
+to free energy based on a Berry phase formulation in the mixed space of
+momentum and position, and reveal that they exhibit non-Lifshitz invariants
+features. In particular, a perturbation theory shows in the case of Rashba
+spin-orbit interactions the presence of non-Lifshitz invariants to third order
+in the small spin-orbit interaction and fourth order in the small exchange
+coupling. The higher-order terms may even lead to an enhancement of DMI
+interaction at strong spin-orbit coupling due to divergences in the density of
+states at the bottom of the conduction band. Finally, we also study the DMI
+free energy generated from Rashba spin-orbit interaction in different symmetry
+groups.",2301.11855v2
+2010-08-11,Strong and Tunable Spin-Orbit Coupling of One-Dimensional Holes in Ge/Si Core/Shell Nanowires,"We investigate the low-temperature magneto-transport properties of individual
+Ge/Si core/shell nanowires. Negative magneto-conductance was observed, which is
+a signature of one-dimensional weak antilocalization of holes in the presence
+of strong spin-orbit coupling. The temperature and back gate dependences of
+phase coherence length, spin-orbit relaxation time, and background conductance
+were studied. Specifically, we show the spin-orbit coupling strength can be
+modulated by more than five folds with an external electric field. These
+results suggest the Ge/Si nanowire system possesses strong and tunable
+spin-orbit interactions and may serve as a candidate for spintronics
+applications.",1008.1882v1
+2014-01-06,Engineering spin-orbital magnetic insulator by tailoring superlattices,"Novel interplay of spin-orbit coupling and electron correlations in complex
+Ir oxides recently emerged as a new paradigm for correlated electron physics.
+Because of a large spin-orbit coupling of ~0.5 eV, which is comparable to the
+transfer energy t and the crystal field splitting $\Delta$ and Coulomb U, a
+variety of ground states including magnetic insulator, band insulator,
+semimetal and metal, shows up in a narrow materials phase space. Utilizing such
+subtle competition of the ground states, we successfully tailor a spin-orbital
+magnetic insulator out of a semimetal SrIrO$_3$ by controlling dimensionality
+using superlattice of [(SrIrO$_3$)$_m$, SrTiO$_3$] and show that a magnetic
+ordering triggers the transition to magnetic insulator. Those results can be
+described well by a first-principles calculation. This study is an important
+step towards the design and the realization of topological phases in complex Ir
+oxides with very strong spin-orbit coupling.",1401.1066v1
+2015-03-20,Topological states in multi-orbital HgTe honeycomb lattices,"Research on graphene has revealed remarkable phenomena arising in the
+honeycomb lattice. However, the quantum spin Hall effect predicted at the K
+point could not be observed in graphene and other honeycomb structures of light
+elements due to an insufficiently strong spin-orbit coupling. Here we show
+theoretically that 2D honeycomb lattices of HgTe can combine the effects of the
+honeycomb geometry and strong spin-orbit coupling. The conduction bands,
+experimentally accessible via doping, can be described by a tight-binding
+lattice model as in graphene, but including multi-orbital degrees of freedom
+and spin-orbit coupling. This results in very large topological gaps (up to 35
+meV) and a flattened band detached from the others. Owing to this flat band and
+the sizable Coulomb interaction, honeycomb structures of HgTe constitute a
+promising platform for the observation of a fractional Chern insulator or a
+fractional quantum spin Hall phase.",1503.06066v1
+2020-02-27,Electric control of spin orbit coupling in graphene-based nanostructures with broken rotational symmetry,"Spin and angular momenta of light are important degrees of freedom in
+nanophotonics which control light propagation, optical forces and information
+encoding. Typically, optical angular momentum is generated using q-plates or
+spatial light modulators. Here, we show that graphene-supported plasmonic
+nanostructures with broken rotational symmetry provide a surprising spin to
+orbital angular momentum conversion, which can be continuously controlled by
+changing the electrochemical potential of graphene. Upon resonant illumination
+by a circularly polarized plane wave, a polygonal array of indium-tin-oxide
+nanoparticles on a graphene sheet generates scattered field carrying
+electrically-tunable orbital angular momentum. This unique photonic spin-orbit
+coupling occurs due to the strong coupling of graphene plasmon polaritons and
+localised surface plasmons of the nanoparticles and leads to the controlled
+directional excitation of graphene plasmons. The tuneable spin-orbit conversion
+pave the way to high-rate information encoding in optical communications,
+electric steering functionalities in optical tweezers, and nanorouting of
+higher-dimensional entangled photon states.",2002.12058v1
+2024-03-09,Hybrid Spin-Orbit Exciton-Magnon Excitations in FePS$_3$,"FePS$_3$ is a layered van der Waals (vdW) Ising antiferromagnet that has
+recently been studied in the context of true 2D magnetism, and emerged as an
+ideal material platform for investigating strong spin-phonon coupling, and
+non-linear magneto-optical phenomena. In this work, we demonstrate an important
+unresolved role of spin-orbit coupling (SOC) in the ground state and
+excitations of this compound. Combining first principles calculations with
+Linear Flavor Wave Theory (LFWT), we find strong mixing and spectral overlap of
+different spin-orbital single-ion states. As such, the low-lying excitations
+form complex mixtures of local degrees of freedom most accurately viewed as
+hybrid spin-orbit exciton-magnon modes. Complete parameterization of the
+resulting low-energy model including all such degrees of freedom requires
+nearly half a million coupling constants. Despite this complexity, we show that
+such a model can be inexpensively derived using local many-body-based
+approaches, which yield quantitative agreement with recent experiments. The
+results highlight the importance of SOC even in first row transition metals,
+and provide essential insight into the properties of 2D magnets with unquenched
+orbital moments.",2403.05958v1
+2002-03-27,Electron Double Refraction in Hybrid Systems with Rashba Spin-Orbit Coupling,"We study the scattering of an electron in a definite state of spin at an
+interface of an hybrid system with a Rashba spin-orbit coupling on one side.
+Out of the normal incidence the double refraction phenomenon appears, with one
+or two limit angles for the total reflection. We show that this double
+refraction gives rise to a spin-dependent conductance of a Quantum Point
+Contact separating a ferromagnet and a two dimensional electron gas. The
+birefringence allows the spin filtering with a single interface.",0203569v2
+2004-08-20,Spin Splitting and Spin Current in Strained Bulk Semiconductors,"We present a theory for two recent experiments in bulk strained
+semiconductors \cite{kato1, kato2} and show that a new, previously overlooked,
+strain spin-orbit coupling term may play a fundamental role. We propose simple
+experiments that could clarify the origin of strain-induced spin-orbit coupling
+terms in inversion asymmetric semiconductors. We predict that a uniform
+magnetization parallel to the electric field will be induced in the samples
+studied in \cite{kato1, kato2} for specific directions of the applied electric
+field. We also propose special geometries to detect spin currents in strained
+semiconductors.",0408442v1
+2006-02-23,Two-dimensional electron scattering in regions of nonuniform spin-orbit coupling,"We present a theoretical study of elastic spin-dependent electron scattering
+caused by a nonuniform Rashba spin-orbit coupling strength. Using the
+spin-generalized method of partial waves the scattering amplitude is exactly
+derived for the case of a circular shape of scattering region. We found that
+the polarization of the scattered waves are strongly anisotropic functions of
+the scattering angle. This feature can be utilized to design a good
+all-electric spin-polarizer. General properties of the scattering process are
+also investigated in the high and low energy limits.",0602560v1
+2006-03-06,Edge states generated by spin-orbit coupling at domain walls in magnetic semiconductors,"Electronic states localized at domain walls between ferromagnetically ordered
+phases in two-dimensional electron systems are generated by moderate spin-orbit
+coupling. The spin carried by these states depends on the slope of the magnetic
+background at the domain wall. The number of localized states is determined by
+a real space topological number, and spin perpendicular to the ferromagnetic
+order accumulates in these localized states at domain walls. These trapped
+states may be observed in experiments that probe either spin density or
+conduction paths in quantum wells.",0603145v3
+2007-02-03,Two dimensional electron liquid in the presence of Rashba spin-orbit coupling: symmetric momentum space occupation states,"The orientation of the local electron spin quantization axis in momentum
+space is identified as the most significant physical variable in determining
+the states of a two-dimensional electron liquid in the presence of Rashba
+spin-orbit coupling. Within mean field theory several phases can be identified
+that are characterized by a simple symmetric momentum space occupation. The
+problem admits uniform paramagnetic as well as spin polarized chiral solutions.
+The latter have a nontrivial spin texture in momentum space and are constructed
+out of states that are not solutions of the non interacting Hamiltonian. The
+concept of generalized chirality as well as the stability of spatially
+homogeneous states are also discussed.",0702060v1
+2007-12-23,Spin-orbit coupling in bulk GaAs,"We study the spin-orbit coupling in the whole Brillouin zone for GaAs using
+both the $sp^3s^{\ast}d^5$ and $sp^3s^{\ast}$ nearest-neighbor tight-binding
+models. In the $\Gamma$-valley, the spin splitting obtained is in good
+agreement with experimental data. We then further explicitly present the
+coefficients of the spin splitting in GaAs $L$ and $X$ valleys. These results
+are important to the realization of spintronic device and the investigation of
+spin dynamics far away from equilibrium.",0712.3890v3
+2008-10-19,A scheme for spin transistor with extremely large on/off current ratio,"Quantum wires with periodic local Rashba spin-orbit couplings are proposed
+for a higher performance of spin field-effect transistor. Fano-Rashba quantum
+interference due to the spin-dependent modulated structure gives rise to a
+broad energy range of vanishingly small transmission. Tuning Rashba spin-orbit
+couplings can provide the on- or off-currents with extremely large on/off
+current ratios even in the presence of a strong disorder.",0810.3319v2
+2009-09-08,Inverse Spin Hall Effect in SNS Josephson Junctions,"We consider DC supercurrents in SNS junctions. Spin-orbit coupling in
+combination with Zeeman fields can induce an effective vector potential in the
+normal conductor. As a consequence, an out-of-plane spin-density varying along
+the transverse direction causes a longitudinal phase difference between the
+superconducting terminals. The resulting equilibrium phase coherent
+supercurrent is analogue to the non-equilibrium inverse spin Hall effect in
+normal conductors. We explicitly compute the effect for the Rashba spin orbit
+coupling in a disordered two-dimensional electron gas with an inhomogeneous
+perpendicular Zeeman field.",0909.1416v1
+2010-09-30,Spin Texture in Quantum Point Contacts in the Presence of Lateral Spin Orbit Coupling,"A non-equilibrium Green's function formalism is used to study in detail the
+ballistic conductance of asymmetrically biased side-gated quantum point
+contacts (QPCs) in the presence of lateral spin-orbit coupling and
+electron-electron interaction for a wide range of QPC dimensions and gate bias
+voltage. Various conductance anomalies are predicted below the first quantized
+conductance plateau (G0=2e2/h) which occur due to spontaneous spin polarization
+in the narrowest portion of the QPC. The number of observed conductance
+anomalies increases with increasing aspect ratio (length/width) of the QPC
+constriction. These anomalies are fingerprints of spin textures in the narrow
+portion of the QPC.",1009.6211v1
+2011-05-23,Persistent spin oscillations in a spin-orbit-coupled superconductor,"Quasi-two-dimensional superconductors with tunable spin-orbit coupling are
+very interesting systems with properties that are also potentially useful for
+applications. In this manuscript we demonstrate that these systems exhibit
+undamped collective spin oscillations that can be excited by the application of
+a supercurrent. We propose to use these collective excitations to realize
+persistent spin oscillators operating in the frequency range of 10 GHz - 1 THz.",1105.4451v2
+2011-06-22,Anisotropic super-spin at the end of a carbon nanotube,"Interaction-induced magnetism at the ends of carbon nanotubes is studied
+theoretically, with a special focus on magnetic anisotropies. Spin-orbit
+coupling, generally weak in ordinary graphene, is strongly enhanced in
+nanotubes. In combination with Coulomb interactions, this enhanced spin-orbit
+coupling gives rise to a super-spin at the ends of carbon nanotubes with an XY
+anisotropy on the order of 10 mK. Furthermore, it is shown that this anisotropy
+can be enhanced by more than one order of magnitude via a partial suppression
+of the super-spin.",1106.4549v1
+2011-07-21,Metal-Mott Insulator Transition and Spin Exchange of Two-Component Fermi Gas with Spin-Orbit Coupling in Two-Dimension Square Optical Lattices,"Effects of spin-orbit coupling (SOC) on metal-Mott insulator transition
+(MMIT) and spin exchange physics (SEP) of two-component Fermi gases in
+two-dimension half-filling square optical lattices are investigated. In the
+frame of Kotliar and Ruckenstein slave boson and the second order perturbation
+theory, the phase boundary of paramagnetic MMIT and spin exchange Hamiltonian
+are calculated. In addition by adopting two mean-field ansatzs including
+antiferromagnetic, ferromagnetic and spiral phases, we find that SOC can drive
+a quantum phase transition from antiferromagnet to spiral phase.",1107.4213v2
+2012-02-02,Spin-dependent electron transport in waveguide with continuous shape,"We study effects of the shape of a two-dimensional waveguide on the
+spin-dependent electron transport in the presence of spin-orbit coupling. The
+transition from classical motion to the tunneling regime can be controlled
+there by modulating the strength of spin-orbit coupling if the waveguide has a
+constriction. The spin precession strongly depends on the shape of the
+waveguide.",1202.0541v1
+2012-02-29,Inverse Spin Hall Effect in Ferromagnetic Metal with Rashba Spin Orbit Coupling,"We report an intrinsic form of the inverse spin Hall effect (ISHE) in
+ferromagnetic (FM) metal with Rashba spin orbit coupling (RSOC), which is
+driven by a normal charge current. Unlike the conventional form, the ISHE can
+be induced without the need for spin current injection from an external source.
+Our theoretical results show that Hall voltage is generated when the FM moment
+is perpendicular to the ferromagnetic layer. The polarity of the Hall voltage
+is reversed upon switching the FM moment to the opposite direction, thus
+promising a useful readback mechanism for memory or logic applications.",1202.6428v1
+2013-02-14,Spin-Hall Conductivity and Electric Polarization in Metallic Thin Films,"We predict theoretically that, when a normal metallic thin film (without bulk
+spin-orbit coupling, such as Cu or Al) is sandwiched by two insulators, two
+prominent effects arise due to the interfacial spin-orbit coupling: a giant
+spin-Hall conductivity due to the surface scattering and a transverse electric
+polarization due to the spin-dependent phase shift in the spinor wave
+functions.",1302.3490v2
+2013-12-06,Charge and spin current in a quasi-one-dimensional quantum wire with spin-orbit coupling,"We show that Rashba spin-orbit coupling may result in an energy gap in the
+spectrum of electrons in a two-mode quantum wire if a suitable confining
+potential is chosen. This leads to a dip in the conductance and a spike in the
+spin current at the corresponding position of the Fermi level. Therefore one
+may control the charge and spin currents by means of electrostatic gates
+without using magnetic field or magnetic materials.",1312.1980v2
+2014-01-10,Antiferromagnetic Order in a Semiconductor Quantum Well with Spin-Orbit Coupling,"An argument is made on the existence of a low-temperature itinerant
+antiferromagnetic (AF) spin alignment, rather than persistent helical (PH), in
+the ground state of a two dimensional electron gas in a semiconductor quantum
+well with linear spin-orbit Rashba-Dresselhaus interaction at equal coupling
+strengths, $\alpha$. This result is obtained on account of the opposite-spin
+single-particle state degeneracy at $\mb k = 0$ that makes the spin instability
+possible. A theory of the resulting magnetic phase is formulated within the
+Hartree-Fock approximation of the Coulomb interaction. In the AF state the
+direction of the fractional polarization is obtained to be aligned along the
+displacement vector of the single-particle states.",1401.2427v1
+2015-02-06,Microscopic theory of Gilbert damping in metallic ferromagnets,"We present a microscopic theory for magnetization relaxation in metallic
+ferromagnets of nanoscopic dimensions that is based on the dynamic spin
+response matrix in the presence of spin-orbit coupling. Our approach allows the
+calculation of the spin excitation damping rate even for perfectly crystalline
+systems, where existing microscopic approaches fail. We demonstrate that the
+relaxation properties are not completely determined by the transverse
+susceptibility alone, and that the damping rate has a non-negligible frequency
+dependence in experimentally relevant situations. Our results indicate that the
+standard Landau-Lifshitz-Gilbert phenomenology is not always appropriate to
+describe spin dynamics of metallic nanostructure in the presence of strong
+spin-orbit coupling.",1502.02068v1
+2015-08-14,Proximity-induced triplet superconductivity in Rashba materials,"We study a proximity junction between a conventional s-wave superconductor
+and a conductor with Rashba spin-orbit coupling, with a specific focus on the
+spin structure of the induced pairing amplitude. We find that spin-triplet
+pairing correlations are induced by spin-orbit coupling in both one- and
+two-dimensional systems due to the lifted spin degeneracy. Additionally, this
+induced triplet pairing has a component with an odd frequency dependence that
+is robust to disorder. Our predictions are based on the solutions of the exact
+Gor'kov equations and are beyond the quasiclassical approximation.",1508.03623v2
+2018-02-02,Unique Spin Vortices in Quantum Dots with Spin-orbit Couplings,"Spin textures of one or two electrons in a quantum dot with Rashba or
+Dresselhaus spin-orbit couplings reveal several intriguing properties. We show
+that even at the single-electron level spin vortices with different topological
+charges exist. These topological textures appear in the {\it ground state} of
+the dots. The textures are stabilized by time-reversal symmetry breaking and
+are robust against the eccentricity of the dot. The phenomenon persists for the
+interacting two-electron dot in the presence of a magnetic field.",1802.00788v1
+2016-08-13,Spin-orbit coupling mediated tunable electron heat capacity of quantum wells,"The heat capacity of conduction electrons obtained from the Sommerfeld
+expansion is shown to be tunable via the Rashba and Dresselhaus spin-orbit
+coupling parameters. Using an AlInSb/InSb/AlInSb as a representative
+heterostructure with alterable well and asymmetric barrier regions, the heat
+capacity is found to be higher for the spin-down electrons and suffers a
+reduction for wider wells. A further lowering is obtained through the
+application of an uniaxial strain. Finally, we suggest a method to determine
+the spin lifetimes for spins relaxing via the D'yakonov-Perel' mechanism from
+experimental estimates of thermodynamic potentials such as the Helmholtz free
+energy and the heat capacity.",1608.03998v2
+2016-12-27,Reinventing atomistic magnetic simulations with spin-orbit coupling,"We propose a powerful extension to combined molecular and spin dynamics that
+fully captures the coupling between the atomic and spin subsystems via
+spin-orbit interactions. Its foundation is the inclusion of the local magnetic
+anisotropies that arise as a consequence of the lattice symmetry breaking due
+to phonons or defects. We demonstrate that our extension enables the exchange
+of angular momentum between the atomic and spin subsystems, which is critical
+to the challenges arising in the study of fluctuations and non-equilibrium
+processes in complex, natural, and engineered magnetic materials.",1612.08503v1
+2012-05-09,Exotic quantum spin models in spin-orbit-coupled Mott insulators,"We study cold atoms in an optical lattice with synthetic spin-orbit coupling
+in the Mott-insulator regime. We calculate the parameters of the corresponding
+tight-binding model using Peierls substitution and ""localized Wannier states
+method"" and derive the low-energy spin Hamiltonian for fermions and bosons. The
+spin Hamiltonian is a combination of Heisenberg model, quantum compass model
+and Dzyaloshinskii-Moriya interactions and it has a rich classical phase
+diagram with collinear, spiral and vortex phases.",1205.2110v1
+2017-05-31,Macroscopic random Paschen-Back effect in ultracold atomic gases,"We consider spin- and density-related properties of single-particle states in
+a one-dimensional system with random spin-orbit coupling. We show that the
+presence of an additional Zeeman field $\Delta$ induces both nonlinear spin
+polarization and delocalization of states localized at $\Delta=0$,
+corresponding to a random macroscopic analogue of the Paschen-Back effect.
+While the conventional Paschen-Back effect corresponds to a saturated
+$\Delta-$dependence of the spin polarization, here the gradual suppression of
+the spin-orbit coupling effects by the Zeeman field is responsible both for the
+spin saturation and delocalization of the particles.",1705.11157v1
+2021-06-05,Weak anti-localization in spin-orbit coupled lattice systems: effect of non-adiabatic transitions and estimation of spin relaxation length,"This study investigates the quantum correction effect on electrical
+conductivity using a two-dimensional Wolff Hamiltonian, which is an effective
+model of the spin-orbit coupling (SOC) lattice system. The non-adiabatic
+transition processes in impurity scattering suppress the weak anti-localization
+(WAL) effect. The WAL effect in the SOC lattice system strongly depends on the
+spin relaxation length when compared with the Hikami-Larkin-Nagaoka (HLN)
+theory. The spin relaxation length in Bi thin film is discussed.",2106.02761v2
+2003-01-31,Entanglement of Electron Spin and Orbital States in Spintronic Quantum Transport,"An electron within a mesoscopic (quantum-coherent) spintronic structure is
+described by a single wave function which, in the presence of both charge
+scattering and spin-orbit coupling, encodes an information about {\em
+entanglement} of its spin and orbital degrees of freedom. The quantum state--an
+{\em improper} mixture--of experimentally detectable spin subsystem is
+elucidated by evaluating quantum information theory measures of entanglement in
+the scattering states which determine {\em quantum transport} properties of
+spin-polarized electrons injected into a two-dimensional disordered Rashba
+spin-split conductor that is attached to the ferromagnetic source and drain
+electrodes. Thus, the Landauer transmission matrix, traditionally evaluated to
+obtain the spin-resolved conductances, also yields the reduced spin density
+operator allowing us to extract quantum-mechanical measures of the detected
+electron spin-polarization and spin-coherence, thereby pointing out how to
+avoid detrimental {\em decoherence} effects on spin-encoded information
+transport through semiconductor spintronic devices.",0301614v3
+2013-08-20,Hole Spin Helix: Anomalous Spin Diffusion in Anisotropic Strained Hole Quantum Wells,"We obtain the spin-orbit interaction and spin-charge coupled transport
+equations of a two-dimensional heavy hole gas under the influence of strain and
+anisotropy. We show that a simple two-band Hamiltonian can be used to describe
+the holes. In addition to the well-known cubic hole spin-orbit interaction,
+anisotropy causes a Dresselhaus-like term, and strain causes a Rashba term. We
+discover that strain can cause a shifting symmetry of the Fermi surfaces for
+spin up and down holes. We predict an enhanced spin lifetime associated with a
+spin helix standing wave similar to the Persistent Spin Helix which exists in
+the two-dimensional electron gas with equal Rashba and Dresselhaus spin-orbit
+interactions. These results may be useful both for spin-based experimental
+determination of the Luttinger parameters of the valence band Hamiltonian and
+for creating long-lived spin excitations.",1308.4248v3
+2021-04-12,Quasiparticle interference and quantum confinement in a correlated Rashba spin-split 2D electron liquid,"Exploiting inversion symmetry breaking (ISB) in systems with strong
+spin-orbit coupling promises control of spin through electric fields - crucial
+to achieve miniaturization in spintronic devices. Delivering on this promise
+requires a two-dimensional electron gas with a spin precession length shorter
+than the spin coherence length and a large spin splitting so that spin
+manipulation can be achieved over length scales of nanometers. Recently, the
+transition metal oxide terminations of delafossite oxides were found to exhibit
+a large Rashba spin splitting dominated by ISB. In this limit, the Fermi
+surface exhibits the same spin texture as for weak ISB, but the orbital texture
+is completely different, raising questions about the effect on quasiparticle
+scattering. We demonstrate that the spin-orbital selection rules relevant for
+conventional Rashba system are obeyed as true spin selection rules in this
+correlated electron liquid and determine its spin coherence length from
+quasiparticle interference imaging.",2104.05718v1
+2006-11-08,Control of electron spin and orbital resonance in quantum dots through spin-orbit interactions,"Influence of resonant oscillating electromagnetic field on a single electron
+in coupled lateral quantum dots in the presence of phonon-induced relaxation
+and decoherence is investigated. Using symmetry arguments it is shown that spin
+and orbital resonance can be efficiently controlled by spin-orbit interactions.
+The control is possible due to the strong sensitivity of Rabi frequency to the
+dot configuration (orientation of the dot and a static magnetic field) as a
+result of the anisotropy of the spin-orbit interactions. The so called easy
+passage configuration is shown to be particularly suitable for magnetic
+manipulation of spin qubits, ensuring long spin relaxation time and protecting
+the spin qubit from electric field disturbances accompanying on-chip
+manipulations.",0611228v2
+2013-04-11,Controlling a Nanowire Spin-Orbit Qubit via Electric-Dipole Spin Resonance,"A semiconductor nanowire quantum dot with strong spin-orbit coupling (SOC)
+can be used to achieve a spin-orbit qubit. In contrast to a spin qubit, the
+spin-orbit qubit can respond to an external ac electric field, an effect called
+electric-dipole spin resonance. Here we develop a theory that can apply in the
+strong SOC regime. We find that there is an optimal SOC strength
+\eta_{opt}=\sqrt{2}/2, where the Rabi frequency induced by the ac electric
+field becomes maximal. Also, we show that both the level spacing and the Rabi
+frequency of the spin-orbit qubit have periodic responses to the direction of
+the external static magnetic field. These responses can be used to determine
+the SOC in the nanowire.",1304.3257v2
+2013-05-31,Engineering Quantum Spin Hall Effect in Graphene Nanoribbons via Edge Functionalization,"Kane and Mele predicted that in presence of spin-orbit interaction graphene
+realizes the quantum spin Hall state. However, exceptionally weak intrinsic
+spin-orbit splitting in graphene ($\approx 10^{-5}$ eV) inhibits experimental
+observation of this topological insulating phase. To circumvent this problem,
+we propose a novel approach towards controlling spin-orbit interactions in
+graphene by means of covalent functionalization of graphene edges with
+functional groups containing heavy elements. Proof-of-concept first-principles
+calculations show that very strong spin-orbit coupling can be induced in
+realistic models of narrow graphene nanoribbons with tellurium-terminated
+edges. We demonstrate that electronic bands with strong Rashba splitting as
+well as the quantum spin Hall state spanning broad energy ranges can be
+realized in such systems. Our work thus opens up new horizons towards
+engineering topological electronic phases in nanostructures based on graphene
+and other materials by means of locally introduced spin-orbit interactions.",1305.7392v1
+2022-01-14,An Anderson impurity interacting with the helical edge states in a quantum spin Hall insulator,"Using the natural orbitals renormalization group (NORG) method, we have
+investigated the screening of the local spin of an Anderson impurity
+interacting with the helical edge states in a quantum spin Hall insulator. We
+find that there is a local spin formed at the impurity site and the local spin
+is completely screened by electrons in the quantum spin Hall insulator.
+Meanwhile, the local spin is screened dominantly by a single active natural
+orbital. We then show that the Kondo screening mechanism becomes transparent
+and simple in the framework of natural orbitals formalism. We project the
+active natural orbital respectively into real space and momentum space to
+characterize its structure. And we confirm the spin-momentum locking property
+of the edge states based on the occupancy of a Bloch state in the edge to which
+the impurity couples. Furthermore, we study the dynamical property of the
+active natural orbital represented by the local density of states, from which
+we observe the Kondo resonance peak.",2201.05308v1
+1992-11-19,Spin effects in the inspiral of coalescing compact binaries,"We derive the contributions of spin-orbit and spin-spin coupling to the
+gravitational radiation from coalescing binary systems of spinning compact
+objects. We calculate spin effects in the symmetric, trace-free radiative
+multipoles that determine the gravitational waveform, and the rate of energy
+loss. Assuming a balance between energy radiated and orbital energy lost, we
+determine the spin effects in the evolution of the orbital frequency and
+orbital radius. Assuming that a laser interferometric gravitational observatory
+can track the gravitational-wave frequency (twice the orbital frequency) as it
+sweeps through its sensitive bandwidth between about 10 Hz and one kHz, we
+estimate the accuracy with which the spins of the component bodies can be
+determined from the gravitational-wave signal.",9211025v1
+2013-05-20,Spin-Triplet Pairing State of Sr2RuO4 in the c-Axis Magnetic Field,"We investigate the spin-triplet superconducting state of Sr2RuO4 in the
+magnetic field along the c-axis on the basis of the four-component
+Ginzburg-Landau (GL) model with a weak spin-orbit coupling. We consider
+superconducting states described by the d-vector parallel to the ab-plane, and
+find that three spin-triplet pairing states are stabilized in the magnetic
+field-temperature phase diagram. Although a helical state is stable at low
+magnetic fields, a chiral II state is stabilized at high magnetic fields. A
+non-unitary spin-triplet pairing state appears near the transition temperature
+owing to the coupling of magnetic field and chirality. We elucidate synergistic
+and/or competing roles of the magnetic field, chirality, and spin-orbit
+coupling. It is shown that a fractional vortex lattice is stabilized in the
+chiral II phase owing to the spin-orbit coupling.",1305.4494v2
+2013-07-20,Spin Precession in Inertial and Gravitational Fields,"We discuss the motion of spin in inertial and gravitational fields. The
+coupling of spin with rotation and the gravitomagnetic field has already been
+extensively studied; therefore, we focus here on the inertial and gravitational
+spin-orbit couplings. In particular, we investigate the classical and quantum
+aspects of spin precession and spin-orbit coupling in an arbitrary
+translationally accelerated frame of reference as well as the exterior
+Schwarzschild spacetime. Moreover, in connection with Einstein's principle of
+equivalence, we clarify the relation between the inertial and gravitational
+spin-orbit couplings.",1307.5470v2
+2015-03-06,Controllable magnetic correlation between two impurities by spin-orbit coupling in graphene,"Two magnetic impurities on the edge of a zigzag graphene nanoribbon strongly
+interact with each other via indirect coupling, which can be mediated by
+conducting carriers. By means of Quantum Monte Carlo (QMC) simulations, we find
+that the spin-orbit coupling $\lambda$ and the chemical potential $\mu$ in
+system can be used to drive the transition of local-spin exchange from
+ferromagnetism to anti-ferromagnetism. Since the tunable ranges for $\lambda$
+and $\mu$ in graphene are experimentally reachable, we thus open the
+possibilities for its device application. The symmetry in spatial distribution
+is broken by the vertical and the transversal spin-spin correlations due to the
+effect of spin-orbit coupling, leading to the spatial anisotropy of spin
+exchange, which distinguish our findings from the case in normal Fermi liquid.",1503.01994v1
+2021-08-10,Zero-field spin resonance in graphene with proximity-induced spin-orbit coupling,"We investigate collective spin excitations in graphene with proximity-induced
+spin-orbit coupling (SOC) of the Rashba and valley-Zeeman types, as it is the
+case, e.g., for graphene on transition- metal-dichalcogenide substrates. It is
+shown that, even in the absence of an external magnetic field, such a system
+supports collective modes, which correspond to coupled oscillations of the
+uniform and valley-staggered magnetizations. These modes can be detected via
+both zero-field electron spin resonance (ESR) and zero-field electric-dipole
+spin resonance (EDSR), with EDSR response coming solely from Rashba SOC. We
+analyze the effect of electron-electron interaction within the Fermi- liquid
+kinetic equation and show that the interaction splits both the ESR and EDSR
+peaks into two. The magnitude of splitting and the relative weights of the
+resonances can be used to extract the spin-orbit coupling constants and
+many-body interaction parameters that may not be accessible by other methods.",2108.04420v1
+2013-10-16,Terahertz out-of-plane resonances due to spin-orbit coupling,"A microscopic kinetic theory is developed which allows to investigate
+non-Abelian SU(2) systems interacting with meanfields and spin-orbit coupling
+under magnetic fields in one, two, and three dimensions. The coupled kinetic
+equations for the scalar and spin components are presented and linearized with
+respect to an external electric field. The dynamical classical and quantum Hall
+effect are described in this way as well as the anomalous Hall effect where a
+new symmetric dynamical contribution to the conductivity is presented. The
+coupled density and spin response functions to an electric field are derived
+including arbitrary magnetic fields. The magnetic field induces a staircase
+structure at frequencies of the Landau levels. It is found that for linear
+Dresselhaus and Rashba spin-orbit coupling a dynamical out-of-plane spin
+response appears at these Landau level frequencies establishing terahertz
+resonances.",1310.4405v1
+2018-09-24,Spin-orbit coupling and spin relaxation of hole states in [001]- and [111]-orientedquantum dots of various geometry,"We study the influence of spin-orbit coupling on the hole states in InAs/GaAs
+quantum dots grown on [001]- and [111]-oriented substrates belonging to
+symmetry point groups: C2v, C3v and D2d. We investigate the impact of various
+spin-orbit mechanisms on the strength of coupling between s- and p-shell
+states, which is a significant spin-flip channel in quantum dots. We calculate
+spin relaxation rates between the states of lowest Zeeman doublet and show that
+the [111]-oriented structure offers one order of magnitude slower relaxation
+compared to the usual [001]-oriented self-assembled QD. The magnetic-field
+dependence of the hole states is calculated using multiband (up to 14 bands)
+k.p model. We identify the irreducible representations linked to the states and
+discuss the selection rules, which govern the avoided-crossing pattern in
+magnetic-field dependence of the energy levels. We show that dominant
+contribution to the coupling between some of these states comes from the shear
+strain. On the other hand, we demonstrate no coupling between s- and p-shell
+states in the [111]-oriented structure.",1809.09062v3
+2023-08-04,Spin-valley locking in Kekulé-distorted graphene with Dirac-Rashba interactions,"The joint effects of Kekul\'e lattice distortions and Rashba-type spin-orbit
+coupling on the electronic properties of graphene are explored. We modeled the
+position dependence of the Rashba energy term in a manner that allows its
+seamless integration into the scheme introduced by Gamayun et al.[New J. Phys.
+20, 023016 (2018)] to describe graphene with Kekul\'e lattice distortion.
+Particularly for the Kekul\'e-Y texture, the effective low energy Dirac
+Hamiltonian contains a new spin-valley locking term, in addition to the
+well-known Rashba-induced momentum-pseudospin and spin-pseudospin couplings,
+and the Kekul\'e-induced momentum-valley coupling term. We report on the
+low-energy band structure and Landau level spectra of Rashba-spin-orbit-coupled
+Kek-Y graphene, and propose an experimental scheme to discern between the
+presence of Rashba spin-orbit coupling, Kek-Y lattice distortion, and both,
+based on doping-dependent magnetotransport measurements.",2308.02130v1
+2016-02-19,Electronic orders in multi-orbital Hubbard models with lifted orbital degeneracy,"We study the symmetry-broken phases in two- and three-orbital Hubbard models
+with lifted orbital degeneracy using dynamical mean field theory. On the
+technical level, we explain how symmetry relations can be exploited to measure
+the four-point correlation functions needed for the calculation of the lattice
+susceptibilities. In the half-filled two-orbital model with crystal field
+splitting, we find an instability of the metallic phase to spin-orbital order
+with neither spin nor orbital moment. This ordered phase is shown to be related
+to the recently discovered fluctuating-moment induced spin-triplet
+superconducting state in the orbitally degenerate model with shifted chemical
+potential. In the three-orbital case, we consider the effect of a crystal field
+splitting on the spin-triplet superconducting state in the model with positive
+Hund coupling, and the spin-singlet superconducting state in the case of
+negative Hund coupling. It is demonstrated that for certain crystal field
+splittings the higher energy orbitals instead of the lower ones are relevant
+for superconductivity, and that $T_c$ can be enhanced by the crystal field
+effect. We comment on the implications of our results for the superconductivity
+in strontium ruthenates, and for the recently reported light-enhanced
+superconducting state in alkali-doped fullerides.",1602.06054v1
+2008-09-15,Magnetic breakdown of cyclotron orbits in systems with Rashba and Dresselhaus spin-orbit coupling,"We study the effect of the interplay between the Rashba and the Dresselhaus
+spin-orbit couplings on the transverse electron focusing in two-dimensional
+electron gases. Depending on their relative magnitude, the presence of both
+couplings can result in the splitting of the first focusing peak into two or
+three. This splitting has information about the relative value of spin-orbit
+couplings and therefore about the shape of the Fermi surface. More interesting,
+the presence of the third peak is directly related to the tunneling probability
+(""magnetic breakdown"") between orbits corresponding to the different sheets of
+the Fermi surface. In addition, destructive interference effects between paths
+that involve tunneling and those that do not can be observed in the second
+focusing condition. Such electron paths (orbits) could be experimentally
+detected using current techniques for imaging the electron flow opening the
+possibility to directly observe and characterize the magnetic breakdown effect
+in this system.",0809.2575v1
+2012-11-26,Complex Orbital State Stabilized by Strong Spin-Orbit Coupling in a Metallic Iridium Oxide IrO$_{2}$,"Resonant x-ray diffraction experiments were performed for the metallic
+iridium oxide IrO$_{2}$. We observed anisotropic tensor of susceptibility (ATS)
+scattering, the spectrum of which shows a sharp contrast between the $L_{3}$
+and $L_{2}$ edges. At the $L_{3}$ edge, resonance excitations were clearly
+observed from the core 2$p$ orbitals to both the 5$d$ $t_{2g}$ and $e_{g}$
+orbitals. In contrast, the resonance mode associated with 5$d$ $t_{2g}$
+orbitals was indiscernible at the $L_{2}$ edge. This contrasting behavior
+indicates that Ir 5$d$ $t_{2g}$ orbitals are fairly close to the $J_{\rm eff}$
+= 1/2 state due to the strong spin--orbit coupling in 5$d$ transition metal
+ions, as in the Mott insulator Sr$_{2}$IrO$_{4}$. Our results clearly
+demonstrate that ATS scattering is a useful probe for investigating complex
+orbital states in a metallic state. Such states induce novel phenomena such as
+the spin Hall effect.",1211.5855v1
+2014-04-14,Orbital magnetization of correlated electrons with arbitrary band topology,"Spin-orbit coupling introduces chirality into electronic structure. This can
+have profound effects on the magnetization induced by orbital motion of
+electrons. Here we derive a formula for the orbital magnetization of
+interacting electrons in terms of the full Green's function and vertex
+functions. The formula is applied within dynamical mean-field theory to the
+Kane-Mele-Hubbard model that allows both topological and trivial insulating
+phases. We study the insulating and metallic phases in the presence of an
+exchange magnetic field. In the presence of interactions, the orbital
+magnetization of the quantum spin Hall insulating phase with inversion symmetry
+is renormalized by the bulk quasi-particle weight. The orbital magnetization
+vanishes for the in-plane antiferromagnetic phase with trivial topology. In the
+metallic phase, the enhanced effective spin-orbit coupling due to the
+interaction sometimes leads to an enhancement of the orbital magnetization.
+However, at low doping, magnetization is suppressed at large interaction
+strengths.",1404.3673v3
+2018-02-02,Spin-orbit coupling induced magnetic anisotropy and large spin wave gap in $\rm Na Os O_3$,"The role of spin-orbit coupling and Hund's rule coupling on magnetic
+ordering, anisotropy, and excitations are investigated within a minimal
+three-orbital model for the $5d^3$ compound $\rm Na Os O_3$. Asymmetry between
+the magnetic moments for the $xy$ and $xz,yz$ orbitals, arising from the
+hopping asymmetry generated by the $\rm Os O_6$ octahedral tilting and
+rotation, together with the weak correlation effect, are shown to be crucial
+for the large SOC induced magnetic anisotropy and spin wave gap observed in
+this compound. Due to the intrinsic SOC-induced changes in the electronic
+densities under rotation of the staggered field, their coupling with the
+orbital energy offset is also found to contribute significantly to the magnetic
+anisotropy energy.",1802.01449v2
+2013-06-08,Formation of Feshbach molecules in the presence of artificial spin-orbit coupling and Zeeman fields,"We derive general conditions for the emergence of singlet Feshbach molecules
+in the presence of artificial Zeeman fields for arbritary mixtures of Rashba
+and Dresselhaus spin-orbit orbit coupling in two or three dimensions. We focus
+on the formation of two-particle bound states resulting from interactions
+between ultra-cold spin-1/2 fermions, under the assumption that interactions
+are short-ranged and occur only in the s-wave channel. In this case, we
+calculate explicitly binding energies of Feshbach molecules and analyze their
+dependence on spin-orbit couplings, Zeeman fields, interactions and center of
+mass momentum, paying particular attention to the experimentally relevant case
+of spin-orbit couplings with equal Rashba and Dresselhaus (ERD) amplitudes.",1306.1964v1
+2008-07-23,Kondo effect in carbon nanotube quantum dots with spin-orbit coupling,"Motivated by recent experimental observation of spin-orbit coupling in carbon
+nanotube quantum dots [F. Kuemmeth \textsl{et al.}, Nature (London) {\bf 452},
+448 (2008)], we investigate in detail its influence on the Kondo effect. The
+spin-orbit coupling intrinsically lifts out the fourfold degeneracy of a single
+electron in the dot, thereby breaking the SU(4) symmetry and splitting the
+Kondo resonance even at zero magnetic field. When the field is applied, the
+Kondo resonance further splits and exhibits fine multipeak structures resulting
+from the interplay of spin-orbit coupling and Zeeman effect. A microscopic
+cotunneling process for each peak can be uniquely identified. Finally, a purely
+orbital Kondo effect in the two-electron regime is also obtained.",0807.3595v2
+2021-10-11,Universal excitonic superexchange in spin-orbit-coupled Mott insulators,"We point out the universal presence of the excitonic superexchange in
+spin-orbit-coupled Mott insulators. It is observed that, the restriction to the
+lowest spin-orbit-entangled ""$J$"" states may sometimes be insufficient to
+characterize the microscopic physics, and the virtual excitonic processes via
+the upper ""$J$"" states provide an important correction to the superexchange. We
+illustrate this excitonic superexchange from a two-dimensional $5d$ iridate
+Sr$_2$IrO$_4$ and explain its physical consequences such as the orbital-like
+coupling to the external magnetic flux and the nonlinear magnetic
+susceptibility. The universal presence of the excitonic superexchange in other
+spin-orbit-coupled Mott insulators such as $3d$ Co-based Kitaev magnets and
+even $f$ electron rare-earth magnets is further discussed.",2110.05212v2
+2015-03-26,Spin-orbit excitations and electronic structure of the putative Kitaev magnet $α$-RuCl$_3$,"Mott insulators with strong spin-orbit coupling have been proposed to host
+unconventional magnetic states, including the Kitaev quantum spin liquid. The
+4$d$ system $\alpha$-RuCl$_3$ has recently come into view as a candidate Kitaev
+system, with evidence for unusual spin excitations in magnetic scattering
+experiments. We apply a combination of optical spectroscopy and Raman
+scattering to study the electronic structure of this material. Our measurements
+reveal a series of orbital excitations involving localized total angular
+momentum states of the Ru ion, implying that strong spin-orbit coupling and
+electron-electron interactions coexist in this material. Analysis of these
+features allows us to estimate the spin-orbit coupling strength, as well as
+other parameters describing the local electronic structure, revealing a
+well-defined hierarchy of energy scales within the Ru $d$ states. By comparing
+our experimental results with density functional theory calculations, we also
+clarify the overall features of the optical response. Our results demonstrate
+that $\alpha$-RuCl$_3$ is an ideal material system to study spin-orbit coupled
+magnetism on the honeycomb lattice.",1503.07593v2
+2023-06-17,Proximity-induced spin-orbit coupling in phosphorene on a WSe$_2$ monolayer,"We investigate, using first-principles methods and effective-model
+simulations, the spin-orbit coupling proximity effects in a bilayer
+heterostructure comprising phosphorene and WSe$_2$ monolayers. We specifically
+analyze holes in phosphorene around the $\Gamma$ point, at which we find a
+significant increase of the spin-orbit coupling that can be attributed to the
+strong hybridization of phosphorene with the WSe$_2$ bands. We also propose an
+effective spin-orbit model based on the ${\bf C}_{1{\rm v}}$ symmetry of the
+studied heterostructure. The corresponding spin-orbit field can be divided into
+two parts: the in-plane field, present due to the broken nonsymmorphic
+horizontal glide mirror plane symmetry, and the dominant out-of-plane field
+triggered by breaking the out-of-plane rotational symmetry of the phosphorene
+monolayer. Furthermore, we also demonstrate that a heterostructure with
+60$^\circ$ twist angle exhibits an opposite out-of-plane spin-orbit field,
+indicating that the coupling can effectively be tuned by twisting. The studied
+phosphorene/WSe$_2$ bilayer is a prototypical low common-symmetry
+heterostructure in which the proximity effect can be used to engineer the spin
+texture of the desired material.",2306.10291v2
+2018-06-05,Theory of superconductivity in hole-doped monolayer MoS$_{2}$,"We theoretically investigate the Cooper-pair symmetry to be realized in
+hole-doped monolayer MoS$_2$ by solving linearized BCS gap equations on the
+three-orbital attractive Hubbard-like model in the presence of the atomic
+spin-orbit coupling. In hole-doped monolayer MoS$_2$, both spin-orbit coupling
+and the multi-orbital effects are more prominent than those of electron-doped
+system. Near the valence band edge, the Fermi surfaces are composed of three
+different types of hole pockets, namely, one mainly consisting of the almost
+spin-degenerate $|d_{z^{2}}\rangle$ orbital near $\Gamma$ point, and the others
+of the spin-split upper and lower bands near ${\rm K}$ and ${\rm K}'$ points
+arising from the $|d_{x^{2}-y^{2}}\rangle$ and $|d_{xy}\rangle$ orbitals. The
+number of relevant Fermi pockets increases with increase of the doping. At very
+low doping, the upper split bands of $|d_{x^{2}-y^{2}}\rangle$ and
+$|d_{xy}\rangle$ are concerned, yielding extremely low $T_{\rm c}$ due to small
+density of states of the split bands. For further doping, the conventional
+spin-singlet state (SS) appears in the $\Gamma$ pocket, which has a mixture of
+the spin-triplet (orbital-singlet) (ST-OS) and spin-singlet (orbital-triplet)
+(SS-OT) states in the K and K$'$ pockets. The ratio of the mixture depends on
+the relative strength of the interactions, and the sign of the exchange
+interactions. Moderately strong ferromagnetic exchange interactions even lead
+to the pairing state with the dominant ST-OS state over the conventional SS
+one. With these observations, we expect that the fascinating pairing with
+relatively high $T_{\rm c}$ emerges at high doping that involves all the three
+Fermi pockets.",1806.01447v1
+2018-01-17,First-principles quantum transport modeling of spin-transfer and spin-orbit torques in magnetic multilayers,"We review a unified approach for computing: (i) spin-transfer torque in
+magnetic trilayers like spin-valves and magnetic tunnel junction, where
+injected charge current flows perpendicularly to interfaces; and (ii)
+spin-orbit torque in magnetic bilayers of the type
+ferromagnet/spin-orbit-coupled-material, where injected charge current flows
+parallel to the interface. Our approach requires to construct the torque
+operator for a given Hamiltonian of the device and the steady-state
+nonequilibrium density matrix, where the latter is expressed in terms of the
+nonequilibrium Green's functions and split into three contributions. Tracing
+these contributions with the torque operator automatically yields field-like
+and damping-like components of spin-transfer torque or spin-orbit torque
+vector, which is particularly advantageous for spin-orbit torque where the
+direction of these components depends on the unknown-in-advance orientation of
+the current-driven nonequilibrium spin density in the presence of spin-orbit
+coupling. We provide illustrative examples by computing spin-transfer torque in
+a one-dimensional toy model of a magnetic tunnel junction and realistic
+Co/Cu/Co spin-valve, both of which are described by first-principles
+Hamiltonians obtained from noncollinear density functional theory calculations;
+as well as spin-orbit torque in a ferromagnetic layer described by a
+tight-binding Hamiltonian which includes spin-orbit proximity effect within
+ferromagnetic monolayers assumed to be generated by the adjacent monolayer
+transition metal dichalcogenide.",1801.05793v2
+2024-03-01,Unveiling the physics of the spin-orbit coupling at the surface of a model topological insulator: from theory to experiments,"Spin-orbit interaction affects the band structure of topological insulators
+beyond the opening of an inverted gap in the bulk bands, and the understanding
+of its effects on the surface states is of primary importance to access the
+underlying physics of these exotic states. Here, we propose an $\textit{ab
+initio}$ approach benchmarked by pump-probe angle-resolved photoelectron
+spectroscopy data to model the effect of spin-orbit coupling on the surface
+states of a topological insulator. The critical novelty of our approach lies in
+the possibility of accounting for a partial transfer of the spin-orbit coupling
+to the surface states, mediated by the hybridization with the surface resonance
+states. In topological insulators, the fraction of transferred spin-orbit
+coupling influences the strength of the hexagonal warping of the surface
+states, which we use as a telltale of the capability of our model to reproduce
+the experimental dispersion. The comparison between calculations and
+measurements, of both the unoccupied and part of the occupied Dirac cone,
+indicates that the fraction of spin-orbit coupling transferred to the surface
+states by hybridization with the resonance states is between 70% and 85% of its
+full atomic value. This offers a valuable insight to improve the modeling of
+surface state properties in topological insulators for both scientific purposes
+and technological applications.",2403.01029v1
+2022-09-11,Orbital correlations in ultrathin films of late transition metals,"We develop a two-orbital Hubbard model of electron correlations in ultrathin
+(111)-oriented fcc films of late transition metals such as Co and Ni. Our model
+indicates that the Mott-Hund's interaction results in ferromagnetic
+nearest-neighbor orbital correlations. Frustration associated with the mismatch
+between orbital and crystal symmetries prevents orbital ordering, resulting in
+the orbital liquid state. This state can be manifested in phenomena involving
+spin-orbit coupling, such as magnetic anisotropy.",2209.04949v3
+2005-06-23,Nondissipative Spin Hall Effect via Quantized Edge Transport,"The spin Hall effect in a two-dimensional electron system on honeycomb
+lattice with both intrinsic and Rashba spin-orbit couplings is studied
+numerically. Integer quantized spin Hall conductance is obtained at zero Rashba
+coupling limit when electron Fermi energy lies in the energy gap created by the
+intrinsic spin-orbit coupling, in agreement with recent theoretical prediction.
+While nonzero Rashba coupling destroys electron spin conservation, the spin
+Hall conductance is found to remain near the quantized value, being insensitive
+to disorder scattering, until the energy gap collapses with increasing the
+Rashba coupling. We further show that the charge transport through
+counterpropagating spin-polarized edge channels is well quantized, which is
+associated with a topological invariant of the system.",0506589v2
+2012-09-04,Quantum nanostructures in strongly spin-orbit coupled two-dimensional systems,"Recent progress in experimental studies of low-dimensional systems with
+strong spin-orbit coupling poses a question on the effect of this coupling on
+the energy spectrum of electrons in semiconductor nanostructures. It is shown
+in the paper that this effect is profound in the strong coupling limit. In
+circular quantum dots a soft mode develops, in strongly elongated dots electron
+spin becomes protected from the effects of the environment, and the lower
+branch of the energy spectrum of quantum wires becomes nearly flat in a wide
+region of the momentum space.",1209.0828v1
+2019-05-10,Bound-State Band Reconstruction and Resonance in Spin-1/2 Bose Gas with 1D Spin-Orbit Coupling,"In this work, we study two-body bound states in two-component Bose gas with a
+one-dimensional (1D) spin-orbit coupling (SOC) induced by Raman lasers. The
+finite Raman coupling strength generates coupling among three spin channels,
+resulting in the reconstruction of three bound-state bands. In addition,
+multiple resonances can be induced at finite scattering lengths. By tuning the
+interaction in one intra-species channel, one bound-state band can be lifted
+and three resonances can be achieved at different center-of-mass momenta, which
+can be observable under current experimental conditions in ${}^{87}$Rb atoms.",1905.03979v1
+2017-11-14,Vortex dipole precession in a Fermi superfluid with Rashba spin-orbit coupling,"We present a closed-form expression for the time dynamics of a balanced Fermi
+superfluid with s-wave pairing and Rashba spin-orbit (SO) coupling. Solving the
+associated self-consistency conditions for an initial number density given by a
+Gaussian and an initial gap containing a vortex dipole, we show that Rashba SO
+coupling results in precession of the vortex dipole. The integrated
+self-consistent gap decays as a function of time, characterising a ""transient
+Fermi superfluid"". Our analytic solution forms a starting point for studies of
+vortex dynamics -- in particular braiding of Majorana fermions -- in Fermi
+superfluids in the presence of spin population imbalance and two-dimensional SO
+coupling, which are both required to realize a topological atomic Fermi gas in
+experiments.",1711.04970v1
+2023-06-15,Predictable gate-field control of spin in altermagnets with spin-layer coupling,"Spintronics, a technology harnessing electron spin for information
+transmission, offers a promising avenue to surpass the limitations of
+conventional electronic devices. While the spin directly interacts with the
+magnetic field, its control through the electric field is generally more
+practical, and has become a focal point in the field of spintronics. Current
+methodologies for generating spin polarization via an electric field generally
+necessitate spin-orbit coupling. Here, we propose an innovative mechanism that
+accomplishes this task without dependence on spin-orbit coupling. Our method
+employs two-dimensional altermagnets with valley-mediated spin-layer coupling
+(SLC), in which electronic states display symmetry-protected and
+valley-contrasted spin and layer polarization. The SLC facilitates predictable,
+continuous, and reversible control of spin polarization using a gate electric
+field. Through symmetry analysis and ab initio calculations, we pinpoint
+high-quality material candidates that exhibit SLC. We ascertain that applying a
+gate field of $0.2$ eV/\AA~ to monolayer Ca(CoN)$_2$ can induce significant
+spin splitting up to 123 meV. As a result, perfect and switchable
+spin/valley-currents, and substantial tunneling magnetoresistance can be
+achieved in these materials using only a gate field. These findings provide new
+opportunities for generating predictable spin polarization and designing novel
+spintronic devices based on coupled spin, valley and layer physics.",2306.08902v1
+2023-05-26,Can Orbital-Selective Néel Transitions Survive Strong Nonlocal Electronic Correlations?,"Spin- or orbital-selective behaviours in correlated electron materials offer
+rich promise for spintronics or orbitronics phenomena and applications deriving
+from them. Strong local electronic Coulomb correlations might lead to an
+orbital-selective Mott state, characterised by the coexistence of localized
+electrons in some orbitals with itinerant electrons in others. Nonlocal
+electronic fluctuations are much more entangled in orbital space than the local
+ones. For this reason, finding orbital-selective phenomena related to nonlocal
+correlations, such as orbital-selective magnetic transitions, is a challenge.
+In this work we investigate possibilities to realize an orbital-selective
+N\'eel transition (OSNT). We illustrate that stabilising this state requires a
+decoupling of magnetic fluctuations in different orbitals, which can only be
+realized in the absence of Hund's exchange coupling. On the basis of
+two-orbital calculations for a Hubbard model with different bandwidths we show
+that the proposed OSNT can be found all the way from the weak to the strong
+coupling regime. In the weak coupling regime the transition is governed by a
+Slater mechanism and thus occurs first for the narrow orbital. At strong
+coupling a Heisenberg mechanism of the OSNT sets in, and the transition occurs
+first for the wide orbital. Remarkably, at intermediate values of the
+interaction we find a non-trivial regime of the OSNT, where the Slater
+mechanism leads to a N\'eel transition occurring first for the wide orbital.
+Our work suggests strategies for searching for orbital-selective N\'eel
+ordering in real materials, in view of possible spin-orbitronics applications.",2305.16730v2
+2015-12-01,Gyroscopes orbiting black holes: A frequency-domain approach to precession and spin-curvature coupling for spinning bodies on generic Kerr orbits,"A small body orbiting a black hole follows a trajectory that, at leading
+order, is a geodesic of the black hole spacetime. Much effort has gone into
+computing ""self force"" corrections to this motion, arising from the small
+body's own contributions to the system's spacetime. Another correction to the
+motion arises from coupling of the small body's spin to the black hole's
+spacetime curvature. Spin-curvature coupling drives a precession of the small
+body, and introduces a ""force"" (relative to the geodesic) which shifts the
+small body's worldline. These effects scale with the small body's spin at
+leading order. In this paper, we show that the equations which govern
+spin-curvature coupling can be analyzed with a frequency-domain decomposition,
+at least to leading order in the small body's spin. We show how to compute the
+frequency of precession along generic orbits, and how to describe the small
+body's precession and motion in the frequency domain. We illustrate this
+approach with a number of examples. This approach is likely to be useful for
+understanding spin coupling effects in the extreme mass ratio limit, and may
+provide insight into modeling spin effects in the strong field for non-extreme
+mass ratios.",1512.00376v2
+2005-02-24,Non-exponential spin relaxation in magnetic field in quantum wells with random spin-orbit coupling,"We investigate the spin dynamics of electrons in quantum wells where the
+Rashba type of spin-orbit coupling is present in the form of random nanosize
+domains. We study the effect of magnetic field on the spin relaxation in these
+systems and show that the spatial randomness of spin-orbit coupling limits the
+minimum relaxation rate and leads to a Gaussian time-decay of spin polarization
+due to memory effects. In this case the relaxation becomes faster with increase
+of the magnetic field in contrast to the well known magnetic field suppression
+of spin relaxation.",0502593v3
+2006-07-15,Degradation of electron-hole entanglement by spin-orbit coupling,"Electron-hole pairs produced by tunneling in a degenerate electron gas lose
+their spin entanglement by spin-orbit coupling, which transforms the fully
+entangled Bell state into a partially entangled mixed density matrix of the
+electron and hole spins. We calculate the dependence of the entanglement
+(quantified by the concurrence) on the spin-orbit coupling time tau_so and on
+the diffusion time (or dwell time) tau_dwell of electron and hole in the
+conductors (with conductances >> e^2/h) at the two sides of the tunnel barrier
+(with conductance << e^2/h). The entanglement disappears when the ratio
+tau_dwell/tau_so exceeds a critical value of order unity. The results depend on
+the type of conductor (disordered wire or chaotic quantum dot), but they are
+independent of other microscopic parameters (number of channels, level
+spacing). Our analytical treatment relies on an ""isotropy approximation"" (no
+preferential basis in spin space), which allows us to express the concurrence
+entirely in terms of spin correlators. We test this approximation for the case
+of chaotic dynamics with a computer simulation (using the spin kicked rotator)
+and find good agreement.",0607395v2
+2007-05-16,Charge and spin density response functions of the clean two-dimensional electron gas with Rashba spin-orbit coupling at finite momenta and frequencies,"We analytically evaluate charge and spin density response functions of the
+clean two-dimensional electron gas with Rashba spin-orbit coupling at finite
+momenta and frequencies. On the basis of our exact expressions we discuss the
+accuracy of the long-wavelength and the quasiclassical approximations. We also
+derive the static limit of spin susceptibilities and demonstrate, in
+particular, how the Kohn-like anomalies in their derivatives are related to the
+spin-orbit modification of the Ruderman-Kittel-Kasuya-Yosida interaction.
+Taking into account screening and exchange effects of the Coulomb interaction,
+we describe the collective charge and spin density excitation modes which
+appear to be coupled due to nonvanishing spin-charge response function.",0705.2419v1
+2008-03-05,"Spin-orbit coupling, edge states and quantum spin Hall criticality due to Dirac fermion confinement: The case study of graphene","We propose a generalized Dirac fermion description for the electronic state
+of graphene terminated by a zigzag edge. This description admits a spin-orbit
+coupling needed to preserve time-reversal invariance of the zigzag confinement,
+otherwise, for spinless particles, showing the parity anomaly typical of
+quantum electrodynamics in (2+1) dimensions. At a certain critical strength the
+spin-orbit coupling induces a phase transition of the quantum-spin-Hall type.
+It is manifested by a novel type of the edge states consisting of a Kramers'
+pair of counter-propagating modes with opposite spin orientations. Such edge
+states are capable of accumulating an integer spin in response to a transverse
+electric field in the absence of a magnetic one. They exist without any
+excitation gap in the bulk, due to which our system stands out among other
+quantum spin Hall systems studied earlier. We show that at the transition the
+local density of states is discontinuous and its energy dependence reflects the
+phase diagram of the system.",0803.0713v3
+2008-09-24,Electron spin relaxation in cubic GaN quantum dots,"The spin relaxation time $T_{1}$ in zinc blende GaN quantum dot is
+investigated for different magnetic field, well width and quantum dot diameter.
+The spin relaxation caused by the two most important spin relaxation mechanisms
+in zinc blende semiconductor quantum dots, {i.e.} the electron-phonon
+scattering in conjunction with the Dresselhaus spin-orbit coupling and the
+second-order process of the hyperfine interaction combined with the
+electron-phonon scattering, are systematically studied. The relative importance
+of the two mechanisms are compared in detail under different conditions. It is
+found that due to the small spin orbit coupling in GaN, the spin relaxation
+caused by the second-order process of the hyperfine interaction combined with
+the electron-phonon scattering plays much more important role than it does in
+the quantum dot with narrower band gap and larger spin-orbit coupling, such as
+GaAs and InAs.",0809.4103v2
+2014-07-23,Topological Yu-Shiba-Rusinov chain from spin-orbit coupling,"We investigate the possibility of realizing a topological state in the
+impurity band formed by a chain of classical spins embedded in a
+two-dimensional singlet superconductor with Rashba spin-orbit coupling. In
+contrast to similar proposals which require a helical spin texture of the
+impurity spins for a nontrivial topology, here we show that spin-flip
+correlations due to the spin-orbit coupling in the superconductor produces a
+topological state for ferromagnetic alignment of the impurity spins. From the
+Bogoliubov-de Gennes equations we derive an effective tight-binding model for
+the subgap states which resembles a spinless superconductor with long-range
+hopping and pairing terms. We evaluate the topological invariant, and show that
+a topologically non-trivial state is generically present in this model.",1407.6345v4
+2014-10-06,Surprisingly large inverse spin Hall effect and systematic variation of spin-orbit coupling with d-orbital filling in 3d transition metals,"It is generally believed that spin-orbit coupling (SOC) follows Z4 (atomic
+number) dependence and becomes significant only in heavy elements.
+Consequently, SOC in 3d transition metals should be negligible given their
+small Z. Using dynamic spin pumping of Y3Fe5O12-based structures, we uncover a
+systematic evolution of spin Hall angle with d-orbital filling in a series of
+3d metals, reminiscent of behavior observed in 5d metals. In particular, Cr and
+Ni show very large spin Hall angle (half of that for Pt), indicating that
+d-orbital filling rather than Z plays a dominant role in spin Hall effect (SHE)
+in 3d metals. This result enriches our understanding of SHE and broadens the
+scope of materials available for exploring the rich phenomena enabled by SOC as
+well as presenting a guidepost for testing theoretical models of spin-orbit
+coupling in transition metals.",1410.1590v1
+2018-04-10,Theory of the inverse spin galvanic effect in quantum wells,"The understanding of the fundamentals of spin and charge densities and
+currents interconversion by spin-orbit coupling can enable efficient
+applications beyond the possibilities offered by conventional electronics. For
+this purpose we consider various forms of the frequency-dependent inverse spin
+galvanic effect (ISGE) in semiconductor quantum wells and epilayers taking into
+account the cubic in the electron momentum spin-orbit coupling in the Rashba
+and Dresselhaus forms, concentrating on the current-induced spin polarization
+(CISP). We find that including the cubic terms qualitatively explains recent
+findings of the CISP in InGaAs epilayers being the strongest if the internal
+spin-orbit coupling field is the smallest and vice versa (Norman et . 2014,
+Luengo et al. 2017), in contrast to the common understanding. Our results
+provide a promising framework for the control of spin transport in future
+spintronics devices.",1804.03607v1
+2017-01-30,Omnidirectional spin Hall effect in a Weyl spin-orbit coupled atomic gas,"We show that in the presence of a three-dimensional (Weyl) spin-orbit
+coupling, a transverse spin current is generated in response to either a
+constant spin-independent force or a time-dependent Zeeman field in an
+arbitrary direction. This effect is the non-Abelian counterpart of the
+universal intrinsic spin Hall effect characteristic to the two-dimensional
+Rashba spin-orbit coupling. We quantify the strength of such an omnidirectional
+spin Hall effect by calculating the corresponding conductivity for fermions and
+non-condensed bosons. The absence of any kind of disorder in ultracold-atom
+systems makes the observation of this effect viable.",1701.08773v2
+2009-12-17,Solid-State Spin-Photon Quantum Interface without Spin-Orbit Coupling,"We show that coherent optical manipulation of a single confined spin is
+possible even in the absence of spin-orbit coupling. To this end, we consider
+the non-Markovian dynamics of a single valence orbital hole spin that has
+optically induced spin exchange coupling to a low temperature partially
+polarized electron gas. We show that the fermionic nature of the reservoir
+induces a coherent component to the hole spin dynamics that does not generate
+entanglement with the reservoir modes. We analyze in detail the competition of
+this reservoir-assisted coherent contribution with dissipative components
+displaying markedly different behavior at different time scales and determine
+the fidelity of optically controlled spin rotations.",0912.3378v1
+2016-08-22,Spin Seebeck effect and thermoelectric phenomena in superconducting hybrids with magnetic textures or spin-orbit coupling,"We theoretically consider the spin Seebeck effect, the charge Seebeck
+coefficient, and the thermoelectric figure of merit in superconducting hybrid
+structures including either magnetic textures or intrinsic spin-orbit coupling.
+We demonstrate that large magnitudes for all these quantities are obtainable in
+Josephson-based systems with either zero or a small externally applied magnetic
+field. This provides an alternative to the thermoelectric effects generated in
+high-field ($\sim 1$ T) superconducting hybrid systems, which were recently
+experimentally demonstrated. The systems studied contain either textured
+ferromagnets, spin-active interfaces, or spin-orbit coupling. We present a
+framework for calculating the linear thermoelectric response for both spin and
+charge of a system upon applying temperature and voltage gradients based on
+quasiclassical theory which allows for arbitrary spin-dependent textures and
+fields to be conveniently incorporated.",1608.06285v2
+2018-07-18,Extrinsic Spin-Charge Coupling in Diffusive Superconducting Systems,"We present a theoretical study of diffusive superconducting systems with
+extrinsic spin-orbit coupling and arbitrarily strong impurity potential. We
+derive from a microscopic Hamiltonian a diffusion equation for the
+quasi-classical Green function, and demonstrate that all mechanisms related to
+the spin-orbit coupling are expressed in terms of three kinetic coefficients:
+the spin Hall angle, the spin current swapping coefficient, and the spin
+relaxation rate due to Elliott-Yafet mechanism. The derived diffusion equation
+contains a hitherto unknown term describing a spin-orbit torque that appears
+exclusively in the superconducting state. As an example, we provide a
+qualitative description of a magnetic vortex in a superconductor with triplet
+correlations, and show that the novel term describes a spin torque proportional
+to the vector product between the spectral angular momentum of the condensate
+and the triplet vector. Our equation opens up the possibility to explore
+spintronic effects in superconductors with no counterparts in the normal
+metallic state.",1807.07029v2
+2021-05-22,Photoinduced spin-Hall resonance in a k^3-Rashba spin-orbit coupled two dimensional hole system,"We study the band structure modulation and spin-Hall effect of a
+two-dimensional heavy-hole system with $k^3$-Rashba spin-orbit coupling (RSOC),
+irradiated by linearly polarized light. We find that the band structure becomes
+anisotropic under the illumination by the light. Most remarkably, a pair of
+additional spin-degeneracy points (apart from $\Gamma$ point) emerge in the
+energy dispersion, the locations of which are solely determined by the strength
+of the amplitude of the incident light. If this degeneracy occurs around the
+Fermi level, the spin-Hall conductivity (SHC) exhibits a resonance. Away from
+the degeneracy points, the light rotates the average spin polarization. The
+possible effects of $k^3$-Dresselhaus spin-orbit coupling are also discussed.",2105.10732v2
+2021-12-27,Incoherent chiral-induced spin selectivity,"The observation of spin-dependent transport through organic chiral structures
+has sparked numerous fundamental and applicative questions ranging from biology
+to spintronics. By now, there is a broad consensus that the effect results from
+the combination of spin-orbit coupling and the systems' unique geometry.
+However, two key challenges remain. Firstly, accounting for the magnitude of
+the measured effect in light of the weak spin-orbit coupling in organic
+systems. Secondly, understanding its observation not only in
+tunneling-dominated short molecules, but also in longer ones where
+phonon-assisted hopping via localized states is operative. We focus on the
+latter and find that localization and the complete loss of coherence due to
+phonons do not impede strong spin polarization of charge carriers passing
+through the molecule. Moreover, hopping decouples the energy scale for
+observing spin-selective transport from the magnitude of the spin-orbit
+coupling. Thus, our result may explain the observation of large spin
+selectivity at room temperature and under large applied voltages.",2112.13561v2
+2022-04-14,Collective excitations in cigar-shaped spin-orbit coupled spin-1 Bose-Einstein condensates,"We theoretically study the collective excitations of a spin-orbit-coupled
+spin-1 Bose-Einstein condensate with antiferromagnetic spin-exchange
+interactions in a cigar-shaped trapping potential at zero and finite
+temperatures using the Hartree-Fock-Bogoliubov theory with Popov approximation.
+The collective modes at zero temperature are corroborated by the real-time
+evolution of the ground state subjected to a perturbation suitable to excite a
+density or a spin mode. We have also calculated a few low-lying modes
+analytically and found a very good agreement with the numerical results. We
+confirm the presence of excitations belonging to two broad categories, namely
+density, and spin excitations, based on the calculation of dispersion. The
+degeneracy between a pair of spin modes is broken by the spin-orbit coupling.
+At finite temperature, spin and density excitations show qualitatively
+different behavior as a function of temperature.",2204.06898v2
+2022-09-21,Stabilizing fluctuating spin-triplet superconductivity in graphene via induced spin-orbit coupling,"A recent experiment showed that proximity induced Ising spin-orbit coupling
+enhances the spin-triplet superconductivity in Bernal bilayer graphene. Here,
+we show that, due to the nearly perfect spin rotation symmetry of graphene, the
+fluctuations of the spin orientation of the triplet order parameter suppress
+the superconducting transition to nearly zero temperature. Our analysis shows
+that both Ising spin-orbit coupling and in-plane magnetic field can eliminate
+these low-lying fluctuations and can greatly enhance the transition
+temperature, consistent with the recent experiment. Our model also suggests the
+possible existence of a phase at small anisotropy and magnetic field which
+exhibits quasi-long-range ordered spin-singlet charge 4e superconductivity,
+even while the triplet 2e superconducting order only exhibits short-ranged
+correlations. Finally, we discuss relevant experimental signatures.",2209.10560v1
+2024-03-08,Superconductivity in Two-Dimensional Systems with Unconventional Rashba Bands,"In two-dimensional system with Rashba spin-orbit coupling, it is well-known
+that superconductivity can have mixed spin-singlet and -triplet parity, and the
+$\boldsymbol{d}$-vector of spin-triplet pairing is parallel to
+$\boldsymbol{g}$-vector of Rashba spin-orbit coupling. Here, we propose a model
+to describe a two-dimensional system with unconventional Rashba bands and study
+its superconductivity. We show that the $\boldsymbol{d}$-vector of spin-triplet
+pairing can be either parallel or perpendicular to $\boldsymbol{g}$-vector of
+Rashba spin-orbit coupling depending on the different pairing interaction. We
+also propose a junction to generate tunneling spin current depending on the
+direction of $\boldsymbol{d}$-vector. It provides a detecable evidence to
+distinguish these two different but very similar pairing channels. Furthermore,
+we find this model can give arise to a subleading spin-singlet chiral $p$-wave
+topological superconducting state. More significantly, we find that such
+unconventional Rashba bands and unconventional superconudcting pairings can be
+realized on surface of some superconducting topological materials, such as
+trigonal layered PtBi$_{2}$.",2403.05051v2
+2011-10-13,Evolution of the Kondo resonance feature and its relationship to spin-orbit coupling across the quantum critical point in Ce2Rh{1-x}CoxSi3,"We investigate the evolution of the electronic structure of Ce2Rh{1-x}CoxSi3
+as a function of x employing high resolution photoemission spectroscopy. Co
+substitution at the Rh sites in antiferromagnetic Ce2RhSi3 leads to a
+transition from an antiferromagnetic system to a Kondo system, Ce2CoSi3 via the
+Quantum Critical Point (QCP). High resolution photoemission spectra reveal
+distinct signature of the Kondo resonance feature (KRF) and its spin orbit
+split component (SOC) in the whole composition range indicating finite Kondo
+temperature scale at the quantum critical point. We observe that the intensity
+ratio of the Kondo resonance feature and its spin orbit split component,
+KRF/SOC gradually increases with the decrease in temperature in the strong
+hybridization limit. The scenario gets reversed if the Kondo temperature
+becomes lower than the magnetic ordering temperature. While finite Kondo
+temperature within the magnetically ordered phase indicates applicability of
+the spin density wave picture at the approach to QCP, the dominant temperature
+dependence of the spin-orbit coupled feature suggests importance of spin-orbit
+interactions in this regime.",1110.2836v1
+2013-03-21,Breakdown of singlets and triplets in Sr2RuO4 revealed by spin-resolved ARPES,"Spin-orbit coupling has been conjectured to play a key role in the low-energy
+electronic structure of Sr2RuO4. Using circularly polarized light combined with
+spin- and angle-resolved photoemission spectroscopy, we directly measure the
+value of the effective spin-orbit coupling to be 130 +/- 30 meV. This is even
+larger than theoretically predicted and comparable to the energy splitting of
+the dxy and dxz,yz orbitals around the Fermi surface, resulting in a strongly
+momentum-dependent entanglement of spin and orbital character. As demonstrated
+by the spin expectation value obtained for a pair of electrons with zero total
+momentum, the classification of the Cooper pairs in terms of pure singlets or
+triplets fundamentally breaks down, necessitating a description of the
+unconventional superconducting state of Sr2RuO4 in terms of these newly found
+spin-orbital entangled eigenstates.",1303.5444v2
+2015-02-19,Long-Range Spin-Triplet Correlations and Edge Spin Currents in Diffusive Spin-Orbit Coupled SNS Hybrids with a Single Spin-Active Interface,"Utilizing a SU(2) gauge symmetry technique in the quasiclassical diffusive
+regime, we theoretically study finite-sized two-dimensional intrinsic
+spin-orbit coupled superconductor/normal-metal/superconductor (S/N/S) hybrid
+structures with a single spin-active interface. We consider intrinsic
+spin-orbit interactions (ISOIs) that are confined within the N wire and absent
+in the s-wave superconducting electrodes (S). Using experimentally feasible
+parameters, we demonstrate that the coupling of the ISOIs and spin moment of
+the spin-active interface results in maximum singlet-triplet conversion and
+accumulation of spin current density at the corners of the N wire nearest the
+spin-active interface. By solely modulating the superconducting phase
+difference, we show how the opposing parities of the charge and spin currents
+provide an effective venue to experimentally examine pure edge spin currents
+not accompanied by charge currents. These effects occur in the absence of
+externally imposed fields, and moreover are insensitive to the arbitrary
+orientations of the interface spin moment. The experimental implementation of
+these robust edge phenomena are also discussed.",1502.05719v2
+2023-07-28,Strong tunable coupling between two distant superconducting spin qubits,"Superconducting (or Andreev) spin qubits have recently emerged as an
+alternative qubit platform with realizations in semiconductor-superconductor
+hybrid nanowires. In these qubits, the spin degree of freedom is intrinsically
+coupled to the supercurrent across a Josephson junction via the spin-orbit
+interaction, which facilitates fast, high-fidelity spin readout using circuit
+quantum electrodynamics techniques. Moreover, this spin-supercurrent coupling
+has been predicted to facilitate inductive multi-qubit coupling. In this work,
+we demonstrate a strong supercurrent-mediated coupling between two distant
+Andreev spin qubits. This qubit-qubit interaction is of the longitudinal type
+and we show that it is both gate- and flux-tunable up to a coupling strength of
+178 MHz. Finally, we find that the coupling can be switched off in-situ using a
+magnetic flux. Our results demonstrate that integrating microscopic spin states
+into a superconducting qubit architecture can combine the advantages of both
+semiconductors and superconducting circuits and pave the way to fast two-qubit
+gates between remote spins.",2307.15654v1
+2023-08-24,Methods for transverse and longitudinal spin-photon coupling in silicon quantum dots with intrinsic spin-orbit effect,"In a full-scale quantum computer with a fault-tolerant architecture, having
+scalable, long-range interaction between qubits is expected to be a highly
+valuable resource. One promising method of achieving this is through the
+light-matter interaction between spins in semiconductors and photons in
+superconducting cavities. This paper examines the theory of both transverse and
+longitudinal spin-photon coupling and their applications in the silicon
+metal-oxide-semiconductor (SiMOS) platform. We propose a method of coupling
+which uses the intrinsic spin-orbit interaction arising from orbital
+degeneracies in SiMOS qubits. Using theoretical analysis and experimental data,
+we show that the strong coupling regime is achievable in the transverse scheme.
+We also evaluate the feasibility of a longitudinal coupling driven by an AC
+modulation on the qubit. These coupling methods eschew the requirement for an
+external micromagnet, enhancing prospects for scalability and integration into
+a large-scale quantum computer.",2308.12626v1
+2020-07-24,Thermal and orbital evolution of low-mass exoplanets,"Thermal, orbital, and rotational dynamics of tidally loaded exoplanets are
+interconnected by intricate feedback. The rheological structure of the planet
+determines its susceptibility to tidal deformation and, as a consequence,
+participates in shaping its orbit. The orbital parameters and the spin state,
+conversely, control the rate of tidal dissipation and may lead to substantial
+changes of the interior. We investigate the coupled thermal-orbital evolution
+of differentiated rocky exoplanets governed by the Andrade viscoelastic
+rheology. The coupled evolution is treated by a semi-analytical model, 1d
+parametrized heat transfer and self-consistently calculated tidal dissipation.
+First, we conduct several parametric studies, exploring the effect of the
+rheological properties, the planet's size, and the orbital eccentricity on the
+tidal locking and dissipation. These tests show that the role of tidal locking
+into high spin-orbit resonances is most prominent on low eccentric orbits,
+where it results in substantially higher tidal heating than the synchronous
+rotation. Second, we calculate the long-term evolution of three currently known
+low-mass exoplanets with nonzero orbital eccentricity and absent or yet unknown
+eccentricity forcing (namely GJ 625 b, GJ 411 b, and Proxima Centauri b). The
+tidal model incorporates the formation of a stable magma ocean and a
+consistently evolving spin rate. We find that the thermal state is strongly
+affected by the evolution of eccentricity and spin state and proceeds as a
+sequence of thermal equilibria. Final despinning into synchronous rotation
+slows down the orbital evolution and helps to maintain long-term stable orbital
+eccentricity.",2007.12459v1
+2010-08-07,Energy spectra for quantum wires and 2DEGs in magnetic fields with Rashba and Dresselhaus spin-orbit interactions,"We introduce an analytical approximation scheme to diagonalize parabolically
+confined two dimensional electron systems with both the Rashba and Dresselhaus
+spin-orbit interactions. The starting point of our perturbative expansion is a
+zeroth-order Hamiltonian for an electron confined in a quantum wire with an
+effective spin-orbit induced magnetic field along the wire, obtained by
+properly rotating the usual spin-orbit Hamiltonian. We find that the
+spin-orbit-related transverse coupling terms can be recast into two parts W and
+V, which couple crossing and non-crossing adjacent transverse modes,
+respectively. Interestingly, the zeroth-order Hamiltonian together with W can
+be solved exactly, as it maps onto the Jaynes-Cummings model of quantum optics.
+We treat the V coupling by performing a Schrieffer-Wolff transformation. This
+allows us to obtain an effective Hamiltonian to third order in the coupling
+strength k_Rl of V, which can be straightforwardly diagonalized via an
+additional unitary transformation. We also apply our approach to other types of
+effective parabolic confinement, e.g., 2D electrons in a perpendicular magnetic
+field. To demonstrate the usefulness of our approximate eigensolutions, we
+obtain analytical expressions for the n^th Landau-level g_n-factors in the
+presence of both Rashba and Dresselhaus couplings. For small values of the bulk
+g-factors, we find that spin-orbit effects cancel out entirely for particular
+values of the spin-orbit couplings. By solving simple transcendental equations
+we also obtain the band minima of a Rashba-coupled quantum wire as a function
+of an external magnetic field. These can be used to describe Shubnikov-de Haas
+oscillations. This procedure makes it easier to extract the strength of the
+spin-orbit interaction in these systems via proper fitting of the data.",1008.1317v1
+2015-04-16,Coupling ferroelectricity with spin-valley physics in oxide-based heterostructure,"The coupling of spin and valley physics is nowadays regarded as a promising
+route toward next-generation spintronic and valleytronic devices. In the aim of
+engineering functional properties for valleytronic applications, we focus on
+the ferroelectric heterostructure BiAlO3/BiIrO3, where the complex interplay
+among trigonal crystal field, layer degrees of freedom and spin-orbit coupling
+mediates a strong spin-valley coupling. Furthermore, we show that
+ferroelectricity provides a non-volatile handle to manipulate and switch the
+emerging valley-contrasting spin polarization.",1504.04091v1
+2022-08-29,The Effect of Duschinskii Rotations on Spin-Dependent Electron Transfer Dynamics,"We investigate spin-dependent electron transfer in the presence of a
+Duschinskii rotation. In particular, we propagate dynamics for a two-level
+model system for which spin-orbit coupling introduces an interstate coupling of
+the form $e^{iWx}$, which is both position(x)-dependent and complex-valued. We
+demonstrate that two-level systems coupled to Brownian oscillators with
+Duschinskii rotations (and thus entangled normal modes) can produce marked
+increases in transient spin polarization relative to two-level systems coupled
+to simple shifted harmonic oscillators. These conclusions should have
+significant relevance for modeling the effect of nuclear motion on chiral
+induced spin selectivity.",2208.13378v1
+2023-02-26,Spin-Orbit Coupling of Europa's Ice Shell and Interior,"Europa is an icy ocean world, differentiated into a floating ice shell and
+solid interior, separated by a global ocean. The classical spin-orbit coupling
+problem considers a satellite as a single rigid body, but in the case of
+Europa, the existence of the subsurface ocean enables independent motion of the
+ice shell and solid interior. This paper explores the spin-orbit coupling
+problem for Europa from a dynamical perspective, yielding illuminating
+analytical and numerical results. We determine that the spin behavior of Europa
+is influenced by processes not captured by the classical single rigid body
+spin-orbit coupling analysis. The tidal locking process for Europa is governed
+by the strength of gravity-gradient coupling between the ice shell and solid
+interior, with qualitatively different behavior depending on the scale of this
+effect. In this coupled rigid model, the shell can potentially undergo large
+angular displacements from the solid interior, and the coupling plays an
+outsize role in the dynamical evolution of the moon, even without incorporating
+the dissipative effects of shell non-rigidity. We additionally discuss the
+effects of a realistic viscoelastic shell, and catalogue other torques that we
+expect to be sub-dominant in Europa's spin dynamics, or whose importance is
+unknown. Finally, we explore how the choice of tidal model affects the
+resulting equilibrium spin state.",2302.13226v3
+2019-07-29,"Spin-polarized current, spin-transfer torque and spin Hall effect in presence of an electromagnetic non-minimal coupling","In this contribution, we start off from a fully relativistic description of a
+single electron non-minimally coupled to an external electromagnetic field.
+Making direct use of the field equation, instead of canonically deriving from
+the Lagrangian density, the relativistic total angular momentum is attained,
+where the effect of the relativistic torque due to the external sources is also
+taken into account. Both the spin density and the orbital angular momentum
+tensors are identified in the relativistic-covariant approach. Furthermore, the
+symmetric and gauge invariant energy-momentum tensor is derived as well. In
+addition, to inspect the non-relativistic regime, a perturbative expansion of
+the field equation up to the leading order in $\left(v/c\right)$ is carried
+out, where spin-orbit interaction terms naturally emerge in the
+non-relativistic Hamiltonian as a consequence of the non-minimal coupling.
+Features related to the spin currents, the spin-transfer torque and their
+dependence on both magnetic and electric external fields are then calculated
+and discussed. Considering that spin-orbit coupled systems are of particular
+interest in the study of spin Hall effect, a two-dimensional (planar) scenario
+of the system is contemplated, where the contributions to the Landau levels are
+re-assessed. As a consequence of the planar regime and the non-minimal
+coupling, a peculiar sort of fractionalization of the spin-up and -down
+components emerges with the different spin components localized in distinct
+positions.",1907.12196v2
+2023-01-09,Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets,"Orbital degrees of freedom mediating an interaction between spin and lattice
+were predicted to raise strong magnetoelectric effect, i.e. realize an
+efficient coupling between magnetic and ferroelectric orders. However, the
+effect of orbital fluctuations have been considered only in a few
+magnetoelectric materials, as orbital degeneracy driven Jahn-Teller effect
+rarely couples to polarization. Here, we explore the spin-lattice coupling in
+multiferroic Swedenborgites with mixed valence and Jahn-Teller active
+transition metal ions on a stacked triangular/Kagome lattice using infrared and
+dielectric spectroscopy. On one hand, in CaBa$M_4$O$_7$ ($M$ = Co, Fe), we
+observe strong magnetic order induced shift in the phonon frequencies and a
+corresponding large change in the dielectric response. Remarkably, as an
+unusual manifestation of the spin-phonon coupling, the spin-fluctuations reduce
+the phonon life-time by an order of magnitude at the magnetic phase
+transitions. On the other hand, lattice vibrations, dielectric response, and
+electric polarization show no variation at the N\'eel temperature of
+CaBaFe$_2$Co$_2$O$_7$, which is built up by orbital singlet ions. Our results
+provide a showcase for orbital degrees of freedom enhanced magnetoelectric
+coupling via the example of Swedenborgites.",2301.03292v1
+2006-05-16,Direct electronic measurement of the spin Hall effect,"The generation, manipulation and detection of spin-polarized electrons in
+nanostructures define the main challenges of spin-based electronics[1]. Amongst
+the different approaches for spin generation and manipulation, spin-orbit
+coupling, which couples the spin of an electron to its momentum, is attracting
+considerable interest. In a spin-orbit-coupled system, a nonzero spin-current
+is predicted in a direction perpendicular to the applied electric field, giving
+rise to a ""spin Hall effect""[2-4]. Consistent with this effect,
+electrically-induced spin polarization was recently detected by optical
+techniques at the edges of a semiconductor channel[5] and in two-dimensional
+electron gases in semiconductor heterostructures[6,7]. Here we report
+electrical measurements of the spin-Hall effect in a diffusive metallic
+conductor, using a ferromagnetic electrode in combination with a tunnel barrier
+to inject a spin-polarized current. In our devices, we observe an induced
+voltage that results exclusively from the conversion of the injected spin
+current into charge imbalance through the spin Hall effect. Such a voltage is
+proportional to the component of the injected spins that is perpendicular to
+the plane defined by the spin current direction and the voltage probes. These
+experiments reveal opportunities for efficient spin detection without the need
+for magnetic materials, which could lead to useful spintronics devices that
+integrate information processing and data storage.",0605423v1
+2021-01-12,Role of Berry curvature in the generation of spin currents in Rashba systems,"We study the background (equilibrium), linear and nonlinear spin currents in
+2D Rashba spin-orbit coupled systems with Zeeman splitting and in 3D
+noncentrosymmetric metals using modified spin current operator by inclusion of
+the anomalous velocity. The linear spin Hall current arises due to the
+anomalous velocity of charge carriers induced by the Berry curvature. The
+nonlinear spin current occurs due to the band velocity and/or the anomalous
+velocity. For 2D Rashba systems, the background spin current saturates at high
+Fermi energy (independent of the Zeeman coupling), linear spin current exhibits
+a plateau at the Zeeman gap and nonlinear spin currents are peaked at the gap
+edges. The magnitude of the nonlinear spin current peaks enhances with the
+strength of Zeeman interaction. The linear spin current is polarized out of
+plane, while the nonlinear ones are polarized in-plane. We witness pure
+anomalous nonlinear spin current with spin polarization along the direction of
+propagation. In 3D noncentrosymmetric metals, background and linear spin
+currents are monotonically increasing functions of Fermi energy, while
+nonlinear spin currents vary non-monotonically as a function of Fermi energy
+and are independent of the Berry curvature. These findings may provide useful
+information to manipulate spin currents in Rashba spin-orbit coupled systems.",2101.04435v2
+2018-06-20,Teetering Stars: Resonant Excitation of Stellar Obliquities by Hot and Warm Jupiters with External Companions,"Stellar spin-orbit misalignments (obliquities) in hot Jupiter systems have
+been extensively probed. Such obliquities may reveal clues about hot Jupiter
+dynamical histories. Common explanations for generating obliquities include
+high-eccentricity migration and primordial disk misalignment. This paper
+investigates another mechanism for producing stellar spin-orbit misalignments
+in systems hosting a close-in planet with an external, modestly inclined
+companion. Spin-orbit misalignment may be excited due to a secular resonance,
+occurring when the precession rate of the stellar spin axis (driven by the
+inner planet) becomes comparable to the nodal precession rate of the inner
+planet (driven by the companion). Due to the spin-down of the host star via
+magnetic braking, this resonance may be achieved during the star's
+main-sequence lifetime for a wide range of planet masses and orbital
+architectures. Obliquity excitation is accompanied by a decrease in mutual
+inclination between the inner planet and perturber, and can thus erase high
+inclinations. For hot Jupiters, the stellar spin axis is strongly coupled to
+the orbital axis, and obliquity excitation by a giant planet companion requires
+a strong perturber, usually located within 1-2 AU. For warm Jupiters, the spin
+and orbital axes are more weakly coupled, and the resonance may be achieved for
+distant giant planet perturbers (at several to tens of AU). Since warm Jupiters
+have a high occurrence rate of distant planetary companions with appropriate
+properties for resonant obliquity excitation, stellar obliquities in warm
+Jupiter systems may be common, particularly for warm Jupiters orbiting cool
+stars that have undergone significant spin-down.",1806.07892v2
+2003-08-18,The orientation and magnitude of the orbital precession velocity of a binary pulsar system with double spins,"The measurability of the spin--orbit (S--L) coupling induced orbital effect
+is dependent on the orientation and magnitude of the orbital precession
+velocity, ${\bf \Omega}_0$. This paper derives ${\bf \Omega}_0$ in the case
+that both spins in the binary system contribute to the spin--orbit (S--L)
+coupling, which is suitable for the most popular binary pulsars, Neutron
+star--White Dwarf star (NS--WD) binaries (as well as for NS--NS binaries). This
+paper shows that from two constraints, the conservation of the total angular
+momentum and the triangle formed by the orbital angular momentum, ${\bf L}$,
+the sum the spin angular momenta of the two stars, ${\bf S}$, and the total
+angular momentum, ${\bf J}$, the orbital precession velocity, ${\bf \Omega}_0$,
+along ${\bf J}$ is inevitable. Moreover, by the relation, $S/L\ll 1$, which is
+satisfied for a general binary pulsar, a significant ${\bf \Omega}_0$ (in
+magnitude) is inevitable, 1.5 Post Newtonian order (PN). Which are similar to
+the case of one spin as discussed by many authors. However unlike the one spin
+case, the magnitude of the precession velocity of ${\bf \Omega}_0$ varies
+significantly due to the variation of the sum the spin angular momenta of the
+two stars, ${\bf S}$, which can lead to significant secular variabilities in
+binary pulsars.",0308286v1
+2018-04-26,Spin transport in graphene/transition metal dichalcogenide heterostructures,"Since its discovery, graphene has been a promising material for spintronics:
+its low spin-orbit coupling, negligible hyperfine interaction, and high
+electron mobility are obvious advantages for transporting spin information over
+long distances. However, such outstanding transport properties also limit the
+capability to engineer active spintronics, where strong spin-orbit coupling is
+crucial for creating and manipulating spin currents. To this end, transition
+metal dichalcogenides, which have larger spin-orbit coupling and good interface
+matching, appear to be highly complementary materials for enhancing the
+spin-dependent features of graphene while maintaining its superior charge
+transport properties. In this review, we present the theoretical framework and
+the experiments performed to detect and characterize the spin-orbit coupling
+and spin currents in graphene/transition metal dichalcogenide heterostructures.
+Specifically, we will concentrate on recent measurements of Hanle precession,
+weak antilocalization and the spin Hall effect, and provide a comprehensive
+theoretical description of the interconnection between these phenomena.",1804.10000v1
+2015-07-31,"Edge states, spin transport and impurity induced local density of states in spin-orbit coupled graphene","We study graphene which has both spin-orbit coupling (SOC), taken to be of
+the Kane-Mele form, and a Zeeman field induced due to proximity to a
+ferromagnetic material. We show that a zigzag interface of graphene having SOC
+with its pristine counterpart hosts robust chiral edge modes in spite of the
+gapless nature of the pristine graphene; such modes do not occur for armchair
+interfaces. Next we study the change in the local density of states (LDOS) due
+to the presence of an impurity in graphene with SOC and Zeeman field, and
+demonstrate that the Fourier transform of the LDOS close to the Dirac points
+can act as a measure of the strength of the spin-orbit coupling; in addition,
+for a specific distribution of impurity atoms, the LDOS is controlled by a
+destructive interference effect of graphene electrons which is a direct
+consequence of their Dirac nature. Finally, we study transport across junctions
+which separates spin-orbit coupled graphene with Kane-Mele and Rashba terms
+from pristine graphene both in the presence and absence of a Zeeman field. We
+demonstrate that such junctions are generally spin active, namely, they can
+rotate the spin so that an incident electron which is spin polarized along some
+direction has a finite probability of being transmitted with the opposite spin.
+This leads to a finite, electrically controllable, spin current in such
+graphene junctions. We discuss possible experiments which can probe our
+theoretical predictions.",1507.08762v3
+2020-01-14,Anomalous Josephson Hall effect charge and transverse spin currents in superconductor/ferromagnetic insulator/superconductor junctions,"Interfacial spin-orbit coupling in Josephson junctions offers an intriguing
+way to combine anomalous Hall and Josephson physics in a single device. We
+study theoretically how the superposition of both effects impacts
+superconductor/ferromagnetic insulator/superconductor junctions' transport
+properties. Transverse momentum-dependent skew tunneling of Cooper pairs
+through the spin-active ferromagnetic insulator interface creates sizable
+transverse Hall supercurrents, to which we refer as anomalous Josephson Hall
+effect currents. We generalize the Furusaki-Tsukada formula, which got
+initially established to quantify usual (tunneling) Josephson current flows, to
+evaluate the transverse current components and demonstrate that their
+amplitudes are widely adjustable by means of the spin-orbit coupling strengths
+or the superconducting phase difference across the junction. As a clear
+spectroscopic fingerprint of Josephson junctions, well-localized subgap bound
+states form around the interface. By analyzing the spectral properties of these
+states, we unravel an unambiguous correlation between spin-orbit
+coupling-induced asymmetries in their energies and the transverse current
+response, founding the currents' microscopic origin. Moreover, skew tunneling
+simultaneously acts like a transverse spin filter for spin-triplet Cooper pairs
+and complements the discussed charge current phenomena by their spin current
+counterparts. The junctions' universal spin-charge current cross ratios provide
+valuable possibilities to experimentally detect and characterize interfacial
+spin-orbit coupling.",2001.04691v2
+2005-06-27,Spatial imaging of the spin Hall effect and current-induced polarization in two-dimensional electron gases,"Spin-orbit coupling in semiconductors relates the spin of an electron to its
+momentum and provides a pathway for electrically initializing and manipulating
+electron spins for applications in spintronics and spin-based quantum
+information processing. This coupling can be regulated with quantum confinement
+in semiconductor heterostructures through band structure engineering. Here we
+investigate the spin Hall effect and current-induced spin polarization in a
+two-dimensional electron gas confined in (110) AlGaAs quantum wells using Kerr
+rotation microscopy. In contrast to previous measurements, the spin Hall
+profile exhibits complex structure, and the current-induced spin polarization
+is out-of-plane. The experiments map the strong dependence of the
+current-induced spin polarization to the crystal axis along which the electric
+field is applied, reflecting the anisotropy of the spin-orbit interaction.
+These results reveal opportunities for tuning a spin source using quantum
+confinement and device engineering in non-magnetic materials.",0506704v1
+2015-02-04,Effective-one-body Hamiltonian with next-to-leading order spin-spin coupling,"We propose a way of including the next-to-leading (NLO) order spin-spin
+coupling into an effective-one-body (EOB) Hamiltonian. This work extends [S.
+Balmelli and P. Jetzer, Phys. Rev. D 87, 124036 (2013)], which is restricted to
+the case of equatorial orbits and aligned spins, to general orbits with
+arbitrary spin orientations. This is done applying appropriate canonical
+phase-space transformations to the NLO spin-spin Hamiltonian in
+Arnowitt-Deser-Misner (ADM) coordinates, and systematically adding ""effectiv""
+quantities at NLO to all spin-squared terms appearing in the EOB Hamiltonian.
+As required by consistency, the introduced quantities reduce to zero in the
+test- mass limit. We expose the result both in a general gauge and in a
+gauge-fixed form. The last is chosen such as to minimize the number of new
+coefficients that have to be inserted into the effective spin squared. As a
+result, the 25 parameters that describe the ADM NLO spin-spin dynamics get
+condensed into only 12 EOB terms.",1502.01343v1
+2015-10-20,Effective spin-chain model for strongly interacting one-dimensional atomic gases with an arbitrary spin,"We present a general form of the effective spin-chain model for strongly
+interacting atomic gases with an arbitrary spin in the one-dimensional(1D)
+traps. In particular, for high-spin systems the atoms can collide in multiple
+scattering channels, and we find that the resulted form of spin-chain model
+generically follows the same structure as that of the interaction potentials.
+This is a unified form working for any spin, statistics (Bose or Fermi) and
+confinement potentials. We adopt the spin-chain model to reveal both the
+ferromagnetic(FM) and anti-ferromagnetic(AFM) magnetic orders for strongly
+interacting spin-1 bosons in 1D traps. We further show that by adding the
+spin-orbit coupling, the FM/AFM orders can be gradually destroyed and
+eventually the ground state exhibits universal spin structure and contacts that
+are independent of the strength of spin-orbit coupling.",1510.06087v2
+2016-09-19,Switching ferromagnetic spins by an ultrafast laser pulse: Emergence of giant optical spin-orbit torque,"Faster magnetic recording technology is indispensable to massive data storage
+and big data sciences. {All-optical spin switching offers a possible solution},
+but at present it is limited to a handful of expensive and complex rare-earth
+ferrimagnets. The spin switching in more abundant ferromagnets may
+significantly expand the scope of all-optical spin switching. Here by studying
+40,000 ferromagnetic spins, we show that it is the optical spin-orbit torque
+that determines the course of spin switching in both ferromagnets and
+ferrimagnets. Spin switching occurs only if the effective spin angular momentum
+of each constituent in an alloy exceeds a critical value. Because of the strong
+exchange coupling, the spin switches much faster in ferromagnets than
+weakly-coupled ferrimagnets. This establishes a paradigm for all-optical spin
+switching. The resultant magnetic field (65 T) is so big that it will
+significantly reduce high current in spintronics, thus representing the
+beginning of photospintronics.",1609.05855v1
+2014-06-18,Spin-helical Dirac states in graphene induced by polar-substrate surfaces with giant spin-orbit interaction: a new platform for spintronics,"Spintronics, or spin electronics, is aimed at efficient control and
+manipulation of spin degrees of freedom in electron systems. To comply with
+demands of nowaday spintronics, the studies of electron systems hosting giant
+spin-orbit-split electron states have become one of the most important
+directions providing us with a basis for desirable spintronics devices. In
+construction of such devices, it is also tempting to involve graphene, which
+has attracted great attention because of its unique and remarkable electronic
+properties and was recognized as a viable replacement for silicon in
+electronics. In this case, a challenging goal is to make graphene Dirac states
+spin-polarized. Here, we report on absolutely new promising pathway to create
+spin-polarized Dirac states based on coupling of graphene and polar-substrate
+surface states with giant Rashba-type spin-splitting. We demonstrate how the
+spin-helical Dirac states are formed in graphene deposited on the surface of
+BiTeCl. This coupling induces spin separation of the originally spin-degenerate
+graphene states and results in fully helical in-plane spin polarization of the
+Dirac electrons.",1406.4795v1
+2019-02-07,Spin current generation in organic antiferromagnets,"Spin current--a flow of electron spins without a charge current--is an ideal
+information carrier free from Joule heating for electronic devices. The
+celebrated spin Hall effect, which arises from the relativistic spin-orbit
+coupling, enables us to generate and detect spin currents in inorganic
+materials and semiconductors, taking advantage of their constituent heavy
+atoms. In contrast, organic materials consisting of molecules with light
+elements have been believed to be unsuited for spin current generation. Here we
+show that a class of organic antiferromagnets with checker-plate type molecular
+arrangements can serve as a spin current generator by applying a thermal
+gradient or an electric field, even with vanishing spin-orbit coupling. Our
+findings provide another route to create a spin current distinct from the
+conventional spin Hall effect and open a new field of spintronics based on
+organic magnets having advantages of small spin scattering and long lifetime.",1902.02506v1
+2019-04-24,Enhanced spin-triplet pairing in magnetic junctions with s-wave superconductors,"A common path to superconducting spintronics, Majorana fermions, and
+topologically-protected quantum computing relies on spin-triplet
+superconductivity. While naturally occurring spin-triplet pairing is elusive
+and even common spin-triplet candidates, such as Sr$_2$RuO$_4$, support
+alternative explanations, proximity effects in heterostructures can overcome
+these limitations. It is expected that robust spin-triplet superconductivity in
+magnetic junctions should rely on highly spin-polarized magnets or complex
+magnetic multilayers. Instead, we predict that the interplay of interfacial
+spin-orbit coupling and the barrier strength in simple magnetic junctions, with
+only a small spin polarization and s-wave superconductors, can lead to nearly
+complete spin-triplet superconducting proximity effects. This peculiar behavior
+arises from an effective perfect transparency: interfacial spin-orbit coupling
+counteracts the native potential barrier for states of a given spin and wave
+vector. We show that the enhanced spin-triplet regime is characterized by a
+huge increase in conductance magnetoanisotropy, orders of magnitude larger than
+in the normal state.",1904.10773v1
+2021-06-27,Electrical control of valley-Zeeman spin-orbit coupling-induced spin precession at room temperature,"The ultimate goal of spintronics is achieving electrically controlled
+coherent manipulation of the electron spin at room temperature to enable
+devices such as spin field-effect transistors. With conventional materials,
+coherent spin precession has been observed in the ballistic regime and at low
+temperatures only. However, the strong spin anisotropy and the valley character
+of the electronic states in 2D materials provide unique control knobs to
+manipulate spin precession. Here, by manipulating the anisotropic spin-orbit
+coupling in bilayer graphene by the proximity effect to WSe$_2$, we achieve
+coherent spin precession in the absence of an external magnetic field, even in
+the diffusive regime. Remarkably, the sign of the precessing spin polarization
+can be tuned by a back gate voltage and by a drift current. Our realization of
+a spin field-effect transistor at room temperature is a cornerstone for the
+implementation of energy-efficient spin-based logic.",2106.14237v1
+2022-05-08,Coupled superconducting spin qubits with spin-orbit interaction,"Superconducting spin qubits, also known as Andreev spin qubits, promise to
+combine the benefits of superconducting qubits and spin qubits defined in
+quantum dots. While most approaches to control these qubits rely on controlling
+the spin degree of freedom via the supercurrent, superconducting spin qubits
+can also be coupled to each other via the superconductor to implement two-qubit
+quantum gates. We theoretically investigate the interaction between
+superconducting spin qubits in the weak tunneling regime and concentrate on the
+effect of spin-orbit interaction (SOI), which can be large in
+semiconductor-based quantum dots and thereby offers an additional tuning
+parameter for quantum gates. We find analytically that the effective
+interaction between two superconducting spin qubits consists of Ising,
+Heisenberg, and Dzyaloshinskii-Moriya interactions and can be tuned by the
+superconducting phase difference, the tunnel barrier strength, or the SOI
+parameters. The Josephson current becomes dependent on SOI and spin
+orientations. We demonstrate that this interaction can be used for fast
+controlled phase-flip gates with a fidelity >99.99%. We propose a scalable
+network of superconducting spin qubits which is suitable for implementing the
+surface code.",2205.03843v2
+2017-02-23,Correlation effects and hidden spin-orbit entangled electronic order in parent and electron-doped iridates Sr$_2$IrO$_4$,"Analogs of the high-T$_c$ cuprates have been long sought after in transition
+metal oxides. Due to the strong spin-orbit coupling (SOC), the $5d$ perovskite
+iridates Sr$_2$IrO$_4$ exhibit a low-energy electronic structure remarkably
+similar to the cuprates. Whether a superconducting state exists as in the
+cuprates requires understanding the correlated spin-orbit entangled electronic
+states. Recent experiments discovered hidden order in the parent and electron
+doped iridates, some with striking analogies to the cuprates, including Fermi
+surface pockets, Fermi arcs, and pseudogap. Here, we study the correlation and
+disorder effects in a five-orbital model derived from the band theory. We find
+that the experimental observations are consistent with a $d$-wave spin-orbit
+density wave order that breaks the symmetry of a joint two-fold spin-orbital
+rotation followed by a lattice translation. There is a Berry phase and a
+plaquette spin flux due to spin procession as electrons hop between Ir atoms,
+akin to the intersite SOC in quantum spin Hall insulators. The associated
+staggered circulating $J_\text{eff}=1/2$ spin current can be probed by advanced
+techniques of spin-current detection in spintronics. This electronic order can
+emerge spontaneously from the intersite Coulomb interactions between the
+spatially extended iridium $5d$ orbitals, turning the metallic state into an
+electron doped quasi-2D Dirac semimetal with important implications on the
+possible superconducting state suggested by recent experiments.",1702.07070v4
+2022-03-29,Electronic structure of $\boldsymbolα$-RuCl$_3$ by fixed-node and fixed-phase diffusion Monte Carlo methods,"Layered material $\alpha$-RuCl$_3$ has caught wide attention due to its
+possible realization of Kitaev's spin liquid and its electronic structure that
+involves the interplay of electron-electron correlations and spin-orbit
+effects. Several DFT$+U$ studies have suggested that both electron-electron
+correlations and spin-orbit effects are crucial for accurately describing the
+band gap. This work studies the importance of these two effects using
+fixed-node and fixed-phase diffusion Monte Carlo calculations both in
+spin-averaged and explicit spin-orbit formalisms. In the latter, the
+Slater-Jastrow trial function is constructed from two-component spin-orbitals
+using our recent quantum Monte Carlo (QMC) developments and thoroughly tested
+effective core potentials. Our results show that the gap in the ideal crystal
+is already accurately described by the spin-averaged case, with the dominant
+role being played by the magnetic ground state with significant exchange and
+electron correlation effects. We find qualitative agreement between hybrid DFT,
+DFT+$U$, and QMC. In addition, QMC results agree very well with available
+experiments, and we identify the values of exact Fock exchange mixing that
+provide comparable gaps. Explicit spin-orbit QMC calculations reveal that the
+effect of spin-orbit coupling on the gap is minor, of the order of 0.2 eV,
+which corresponds to the strength of the spin-orbit of the Ru atom.",2203.15949v2
+2014-06-18,Charge and spin polarized currents in mesoscopic rings with Rashba spin-orbit interactions coupled to an electron reservoir,"The electronic states of a mesoscopic ring are assessed in the presence of
+Rashba Spin Orbit coupling and a $U(1)$ gauge field. Spin symmetric coupling to
+an ideal lead is implemented following B\""uttiker's voltage probe. The exact
+density of states is derived using the reservoir uncoupled eigenstates as basis
+functions mixed by the reservoir coupling. The decay time of uncoupled electron
+eigenstates is derived by fitting the broadening profiles. The spin and charge
+persistent currents are computed in the presence of the SO interaction and the
+reservoir coupling for two distinct scenarios of the electron filling fraction.
+The degradation of the persistent currents depends uniformly on the reservoir
+coupling but nonuniformly in temperature, the latter due to the fact that
+currents emerge from different depths of the Fermi sea, and thus for some
+regimes of flux, they are provided with a protective gap. Such flux regimes can
+be tailored by the SO coupling for both charge and spin currents.",1406.4659v1
+2007-02-28,Cubic Dresselhaus Spin-Orbit Coupling in 2D Electron Quantum Dots,"We study effects of the oft-neglected cubic Dresselhaus spin-orbit coupling
+(i.e., $\propto p^3$) in GaAs/AlGaAs quantum dots. Using a semiclassical
+billiard model, we estimate the magnitude of the spin-orbit induced avoided
+crossings in a closed quantum dot in a Zeeman field. Using these results,
+together with previous analyses based on random matrix theory, we calculate
+corresponding effects on the conductance through an open quantum dot. Combining
+our results with an experiment on conductance through an 8 um^2 quantum dot [D
+M Zumbuhl et al., Phys. Rev. B 72, 081305 (2005)] suggests that 1) the GaAs
+Dresselhaus coupling constant, $\gamma$, is approximately 9 eVA^3,
+significantly less than the commonly cited value of 27.5 eVA^3 and 2) the
+majority of the spin-flip component of spin-orbit coupling can come from the
+cubic Dresselhaus term.",0702667v1
+2007-08-17,The Two Dimensional Kondo Model with Rashba Spin-Orbit Coupling,"We investigate the effect that Rashba spin-orbit coupling has on the low
+energy behaviour of a two dimensional magnetic impurity system. It is shown
+that the Kondo effect, the screening of the magnetic impurity at temperatures T
+< T_K, is robust against such spin-orbit coupling, despite the fact that the
+spin of the conduction electrons is no longer a conserved quantity. A proposal
+is made for how the spin-orbit coupling may change the value of the Kondo
+temperature T_K in such systems and the prospects of measuring this change are
+discussed. We conclude that many of the assumptions made in our analysis
+invalidate our results as applied to recent experiments in semi-conductor
+quantum dots but may apply to measurements made with magnetic atoms placed on
+metallic surfaces.",0708.2435v2
+2012-08-08,Tuning Rashba and Dresselhaus spin-orbit couplings: Effects on singlet and triplet condensation with Fermi atoms,"We investigate the pair condensation of a two-spin-component Fermi gas in the
+presence of both Rashba and Dresselhaus spin-orbit couplings. We calculate the
+condensate fraction in the BCS-BEC crossover both in two and in three
+dimensions by taking into account singlet and triplet pairings. These
+quantities are studied by varying the spin-orbit interaction from the case with
+the only Rashba to the equal-Rashba-Dresselhaus one. We find that, by mixing
+the two couplings, the singlet pairing decreases while the triplet pairing is
+suppressed in the BCS regime and increased in the BEC regime, both in two and
+three dimensions. At fixed spin-orbital strength, the greatest total condensate
+fraction is obtained when only one coupling (only Rashba or only Dresselhaus)
+is present.",1208.1637v2
+2012-11-07,Finite-Momentum Dimer Bound State in Spin-Orbit Coupled Fermi Gas,"We investigate the two-body properties of a spin-1/2 Fermi gas subject to a
+spin-orbit coupling induced by laser fields. When an attractive s-wave
+interaction between unlike spins is present, the system may form a dimer bound
+state. Surprisingly, in the presence of a Zeeman field along the direction of
+the spin-orbit coupling, the bound state obtains finite center-of-mass
+mechanical momentum, whereas under the same condition but in the absence of the
+two-body interaction, the system has zero total momentum. This unusual result
+can be regarded as a consequence of the broken Galilean invariance by the
+spin-orbit coupling. Such a finite-momentum bound state will have profound
+effects on the many-body properties of the system.",1211.1700v2
+2012-12-12,Feshbach Resonance in a Synthetic Non-Abelian Gauge Field,"We study the Feshbach resonance of spin-1/2 particles in the presence of a
+uniform synthetic non-Abelian gauge field that produces spin orbit coupling
+along with constant spin potentials. We develop a renormalizable quantum field
+theory that includes the closed channel boson which engenders the Feshbach
+resonance, in the presence of the gauge field. By a study of the scattering of
+two particles in the presence of the gauge field, we show that the Feshbach
+magnetic field, where the apparent low energy scattering length diverges,
+depends on the conserved centre of mass momentum of the two particles. For high
+symmetry gauge fields, such as the one which produces an isotropic Rashba spin
+orbit coupling, we show that the system supports two bound states over a regime
+of magnetic fields for a negative background scattering length and resonance
+width comparable to the energy scale of the spin orbit coupling. We discuss the
+consequences of these findings for the many body setting, and point out that a
+broad resonance (width larger than spin orbit coupling energy scale) is most
+favourable for the realization of the rashbon condensate.",1212.2858v1
+2014-11-24,Numerical analysis of spin-orbit coupled one dimensional Fermi gas in the magnetic field,"We use the density matrix renormalization group method(DMRG) and the infinite
+time evolved block decimation method(iTEBD) to investigate the ground states of
+the spin-orbit coupled Fermi gas in a one dimensional optical lattice with a
+transverse magnetic field. We discover that the system with attractive
+interaction can have a polarized insulator(PI), a superconducting phase(SC), a
+Luther-Emery(LE) phase and a band insulator(BI) phase as we vary the chemical
+potential and the strength of magnetic field. We find that spin-orbit coupling
+induces a triplet pairing order at zero momentum with the same critical
+exponent as that of the singlet pairing one in both the SC and the LE phase. In
+contrast to the FFLO phase found in the spin imbalanced system without
+spin-orbit coupling, pairings at finite momentum in these two phases have a
+larger exponent hence do not dictate the long range behavior. We also find good
+agreements of the dominant correlations between numerical results and the
+prediction from the bosonization method. The presence of Majorana fermions is
+tested. However, unlike results from the mean field study, we do not find
+positive evidence of Majorana fermions in our system.",1411.6439v1
+2016-05-28,Manifestation of chirality in the vortex lattice in a two-dimensional topological superconductor,"We study the vortex lattice in a two-dimensional s-wave topological
+superconductor with Rashba spin-orbit coupling and Zeeman field by solving the
+Bogoliubov-de Gennes equations self-consistently for the superconducting order
+parameter. We find that when spin-orbit coupling is relatively weak, one of the
+two underlying chiralities in the topological superconducting state can be
+strongly manifest in the vortex core structure and govern the response of the
+system to vorticity and a nonmagnetic impurity where the vortex is pinned. The
+Majorana zero mode in the vortex core is found to be robust against the
+nonmagnetic impurity in that it remains effectively a zero-energy bound state
+regardless of the impurity potential strength and the major chirality. The spin
+polarization of the Majorana bound state depends on the major chirality for
+weak spin-orbit coupling, while it is determined simply by the vorticity when
+spin-orbit coupling is relatively strong.",1605.08934v2
+2019-06-19,Superconductivity of mixed parity and frequency in an anisotropic spin-orbit coupling,"We illuminate the superconducting phases in [001]-grown-noncentrosymmetric
+quantum wells with an anisotropic spin-orbit coupling in the presence of
+on-site Hubbard interaction. Within the random phase approximation, we
+investigate the spin-fluctuation-mediated pairing in the presence of
+Rashba/Dresselhaus antisymmetric spin-orbit couplings. Although the existence
+of spatial inversion symmetry desires a dominant d-wave pairing for all filling
+levels, a broken inversion symmetry generates antisymmetric spin-orbit coupling
+and mixes the even- and odd-parity in the superconducting gap. We study the
+symmetry of the mixed-parity gap for various strengths of Hubbard interaction.
+Besides, we consider a superconductor-ferromagnet junction to survey the
+modifications of superconducting order parameters and observe an admixture of
+even- and odd-frequencies due to the ferromagnet exchange field.",1906.08130v1
+2019-04-26,The quasiclassical theory for interfaces with spin--orbit coupling,"In recent years, substantial progress has been made regarding the application
+of quasiclassical theory on superconducting hybrid structures. This theoretical
+framework is reliant on a proper set of boundary conditions in order to
+describe multilayered systems. With the advent of the field of superconducting
+spintronics, systems which combine heavy metal layers, in which there is large
+spin--orbit coupling, with ferromagnets have received a great deal of
+attention, due to their potential for generating long range triplet
+superconductivity. In contrast to interfaces of strongly spin polarized
+materials, which are well understood, a quasiclassical theory for interfaces in
+systems where there is significant spin--orbit coupling does not yet exist.
+After reviewing the quasiclassical theory for interfaces, we here solve this
+problem by deriving a new set of boundary conditions which take spin--orbit
+coupling explicitly into account. We then go on to apply these boundary
+conditions to a superconductor-ferromagnet (SF) bilayer and an SFS Josephson
+weak link, demonstrating the emergence of long range triplet superconductivity
+in these systems.",1904.11986v2
+2003-03-23,Spin-Orbit Coupling and Time-Reversal Symmetry in Quantum Gates,"We study the effect of spin-orbit coupling on quantum gates produced by
+pulsing the exchange interaction between two single electron quantum dots.
+Spin-orbit coupling enters as a small spin precession when electrons tunnel
+between dots. For adiabatic pulses the resulting gate is described by a unitary
+operator acting on the four-dimensional Hilbert space of two qubits. If the
+precession axis is fixed, time-symmetric pulsing constrains the set of possible
+gates to those which, when combined with single qubit rotations, can be used in
+a simple CNOT construction. Deviations from time-symmetric pulsing spoil this
+construction. The effect of time asymmetry is studied by numerically
+integrating the Schr\""odinger equation using parameters appropriate for GaAs
+quantum dots. Deviations of the implemented gate from the desired form are
+shown to be proportional to dimensionless measures of both spin-orbit coupling
+and time asymmetry of the pulse.",0303474v3
+2007-09-18,Intense terahertz laser fields on a two-dimensional hole gas with Rashba spin-orbit coupling,"We investigate the influence on the density of states and the density of spin
+polarization for a two-dimensional hole gas with Rashba spin-orbit coupling
+under intense terahertz laser fields. Via Floquet theorem, we solve the
+time-dependent Schr\""{o}dinger equation and calculate these densities. It is
+shown that a terahertz magnetic moment can be induced for low hole
+concentration. Different from the electron case, the induced magnetic moment is
+quite anisotropic due to the anisotropic spin-orbit coupling. Both the
+amplitude and the direction of the magnetic moment depend on the direction of
+the terahertz field. We further point out that for high hole concentration, the
+magnetic moment becomes very small due to the interference caused by the
+momentum dependence of the spin-orbit coupling. This effect also appears in
+two-dimensional electron systems.",0709.2774v1
+2008-11-27,Interference of heavy holes in an Aharonov-Bohm ring,"We study the coherent transport of heavy holes through a one-dimensional ring
+in the presence of spin-orbit coupling. Spin-orbit interaction of holes, cubic
+in the in-plane components of momentum, gives rise to an angular momentum
+dependent spin texture of the eigenstates and influences transport. We analyze
+the dependence of the resulting differential conductance of the ring on hole
+polarization of the leads and the signature of the textures in the
+Aharonov-Bohm oscillations when the ring is in a perpendicular magnetic field.
+We find that the polarization-resolved conductance reveals whether the dominant
+spin-orbit coupling is of Dresselhaus or Rashba type, and that the cubic
+spin-orbit coupling can be distinguished from the conventional linear coupling
+by observing the four-peak structure in the Aharonov-Bohm oscillations.",0811.4566v1
+2011-02-20,Mean-field Dynamics of Spin-Orbit Coupled Bose-Einstein Condensates,"Spin-orbit coupling (SOC), the interaction between the spin and momentum of a
+quantum particle, is crucial for many important condensed matter phenomena. The
+recent experimental realization of SOC in neutral bosonic cold atoms provides a
+new and ideal platform for investigating spin-orbit coupled quantum many-body
+physics. In this Letter, we derive a generic Gross-Pitaevskii equation as the
+starting point for the study of many-body dynamics in spin-orbit coupled
+Bose-Einstein condensates. We show that different laser setups for realizing
+the same SOC may lead to different mean field dynamics. Various ground state
+phases (stripe, phase separation, etc.) of the condensate are found in
+different parameter regions. A new oscillation period induced by the SOC,
+similar to the Zitterbewegung oscillation, is found in the center of mass
+motion of the condensate.",1102.4045v3
+2011-09-09,Trapped two-dimensional condensates with synthetic spin-orbit coupling,"We study trapped 2D atomic Bose-Einstein condensates with spin-independent
+interactions in the presence of an isotropic spin-orbit coupling, showing that
+a rich physics results from the non-trivial interplay between spin-orbit
+coupling, confinement and inter-atomic interactions. For low interactions two
+types of half-vortex solutions with different winding occur, whereas
+strong-enough repulsive interactions result in a stripe-phase similar to that
+predicted for homogeneous condensates. Intermediate interaction regimes are
+characterized for large enough spin-orbit coupling by an hexagonally-symmetric
+phase with a triangular lattice of density minima similar to that observed in
+rapidly rotating condensates.",1109.2045v2
+2012-05-31,Three-Dimensional Spin-Orbit Coupling in a Trap,"We investigate the properties of an atom under the influence of a synthetic
+three-dimensional spin-orbit coupling (Weyl coupling) in the presence of a
+harmonic trap. The conservation of total angular momentum provides a
+numerically efficient scheme for finding the spectrum and eigenfunctions of the
+system. We show that at large spin-orbit coupling the system undergoes
+dimensional reduction from three to one dimension at low energies, and the
+spectrum is approximately Landau level-like. At high energies, the spectrum is
+approximately given by the three-dimensional isotropic harmonic oscillator. We
+explore the properties of the ground state in both position and momentum space.
+We find the ground state has spin textures with oscillations set by the
+spin-orbit length scale.",1206.0018v2
+2012-06-06,Trapped Fermi gases with Rashba spin-orbit coupling in two dimensions,"We use the Bogoliubov-de Gennes formalism to analyze harmonically trapped
+Fermi gases with Rashba-type spin-orbit coupling in two dimensions. We consider
+both population-balanced and -imbalanced Fermi gases throughout the BCS-BEC
+evolution, and study the effects of spin-orbit coupling on the spontaneously
+induced countercirculating mass currents and the associated intrinsic angular
+momentum. In particular, we find that even a small spin-orbit coupling
+destabilizes Fulde-Ferrel-Larkin-Ovchinnikov (FFLO)-type spatially modulated
+superfluid phases as well as the phase-separated states against the polarized
+superfluid phase. We also show that the continuum of quasiparticle and
+quasihole excitation spectrum can be connected by zero, one or two discrete
+branches of interface modes, depending on the number of interfaces between a
+topologically trivial phase (e.g. locally unpolarized/low-polarized superfluid
+or spin-polarized normal) and a topologically nontrivial one (e.g. locally
+high-polarized superfluid) that may be present in a trapped system.",1206.1240v1
+2014-02-26,Topological metallic states in spin-orbit coupled bilayer systems,"We investigate the influence of different spin-orbit couplings on topological
+phase transitions in the bilayer Kane-Mele model. We find that the competition
+between intrinsic spin-orbit coupling and Rashba spin-orbit coupling can lead
+to two dimensional topological metallic states with nontrivial topology. Such
+phases, although having a metallic bulk, still possess edge states with
+well-defined topological invariants. Specifically, we show that with preserved
+time reversal symmetry, the system can exhibit a $\mathbb{Z}_2$-metallic phase
+with spin helical edge states and a nontrivial $\mathbb{Z}_2$ invariant. When
+time reversal symmetry is broken, a Chern metallic phase could appear with
+chiral edge states and a nontrivial Chern invariant.",1402.6502v1
+2014-04-15,Localization of a spin-orbit coupled Bose-Einstein condensate in a bichromatic optical lattice,"We study the localization of a noninteracting and weakly interacting
+Bose-Einstein condensate with spin-orbit coupling loaded in a quasiperiodic
+bichromatic optical lattice potential using the numerical solution and
+variational approximation of a binary mean-field Gross-Pitaevskii equation with
+two pseudo-spin components. We confirm the existence of the stationary
+localized states in the presence of the spin-orbit and Rabi couplings for an
+equal distribution of atoms in the two components. We find that the interaction
+between the spin-orbit and Rabi couplings favors the localization or
+delocalization of the BEC depending on the the phase difference between the
+components. We also studied the oscillation dynamics of the localized states
+for an initial population imbalance between the two components.",1404.4017v2
+2014-10-21,Bose-Einstein condensation with spin-orbit coupling,"The recent realization of synthetic spin-orbit coupling represents an
+outstanding achievement in the physics of ultracold quantum gases. In this
+review we explore the properties of a spin-orbit-coupled Bose-Einstein
+condensate with equal Rashba and Dresselhaus strengths. This system presents a
+rich phase diagram, which exhibits a tricritical point separating a
+zero-momentum phase, a spin-polarized plane-wave phase, and a stripe phase. In
+the stripe phase translational invariance is spontaneously broken, in analogy
+with supersolids. Spin-orbit coupling also strongly affects the dynamics of the
+system. In particular, the excitation spectrum exhibits intriguing features,
+including the suppression of the sound velocity, the emergence of a roton
+minimum in the plane-wave phase, and the appearance of a double gapless band
+structure in the stripe phase. Finally, we discuss a combined procedure to make
+the stripes visible and stable, thus allowing for a direct experimental
+detection.",1410.5526v2
+2017-03-02,Simple spin-orbit based devices for electron spin polarization,"We propose quantum devices having spin-orbit coupling (but no magnetic fields
+or magnetic materials) that, when attached to leads, yield a high degree of
+transmitted electron polarization. An example of such a simple device is
+treated within a tight binding model composed of two 1D chains coupled by
+several consecutive rungs (i.e., a ladder) and subject to a gate voltage. The
+ensuing scattering problem (with Rashba spin-orbit coupling) is solved, and a
+sizable polarization is predicted. When the ladder is twisted into a helix (as
+in DNA), the curvature energy augments the polarization. For a system with
+random spin-orbit coupling, the distribution of polarization is broad, hence a
+high degree of polarization can be obtained in a measurement of a given
+disorder-realization. When disorder occurs in a double helix structure then,
+depending on scattering energy, the variance of the polarization distribution
+can increase even further due to helix curvature.",1703.00717v2
+2018-04-05,Derivation of a Ginzburg-Landau free energy density containing mixed gradient terms of a $p+ip$ superconductor with spin-orbit coupling,"A Ginzburg-Landau free energy for a superconducting chiral p-wave order
+parameter is derived from a two-dimensional tight binding lattice model with
+weak spin-orbit coupling included as a general symmetry-breaking field.
+Superconductivity is accounted for by a BCS-type nearest neighbor opposite-spin
+interaction where we project the potential onto the $p$-wave irreducible
+representation of the square lattice symmetry group and assume this to be the
+dominating order. The resulting free energy contains kinetic terms that mix
+components of the order parameter as well as directional gradients --- so
+called mixed gradient terms --- as a virtue of the symmetry of the order
+parameter. Spin-orbit coupling and electron-hole anisotropy lead to additional
+contributions to the coefficients of these terms, increasing the number of
+necessary phenomenological parameters by one compared to previous work, and
+leading to an increase in the coefficient measuring Fermi surface anisotropy
+for Rashba spin-orbit coupling in the continuum limit.",1804.01808v1
+2010-05-17,Trigonal warping and anisotropic band splitting in monolayer graphene due to Rashba spin-orbit coupling,"We study the electronic band structure of monolayer graphene when Rashba
+spin-orbit coupling is present. We show that if the Rashba spin-orbit coupling
+is stronger than the intrinsic spin-orbit coupling, the low energy bands
+undergo trigonal-warping deformation and that for energies smaller than the
+Lifshitz energy, the Fermi circle breaks up into separate parts. The effect is
+very similar to what happens in bilayer graphene at low energies. We discuss
+the possible experimental implications, such as threefold increase of the
+minimal conductivity for low electron densities, the wavenumber dependence of
+the band splitting and the spin polarization structure. Our theoretical
+predictions are in agreement with recent experimental results.",1005.2933v2
+2016-11-06,Quasiclassical theory of magnetoelectric effects in superconducting heterostructures in the presence of the spin-orbit coupling,"The quasiclassical theory in terms of equations for the Green's functions
+(Eilenberger equations) is generalized in order to allow for quantitative
+description of the magneto-electric effects and proximity-induced triplet
+correlations in the presence of spin-orbit coupling in hybrid superconducting
+systems. The formalism is valid under the condition that the spin-orbit
+coupling is weak with respect to the Fermi energy, but exceeds the
+superconducting energy scale considerably. On the basis of the derived
+formalism it is shown that the triplet correlations in the spin-orbit coupled
+normal metal can be induced by proximity to a singlet superconductor without
+any exchange or external magnetic field. They contain an odd-frequency
+even-momentum component, which is stable against disorder. The value of the
+proximity-induced triplet correlations is of the order of
+$\Delta_{so}/\varepsilon_F$, that is absent in the framework of the standard
+quasiclassical approximation, but can be described by our theory. The spin
+polarization, induced by the Josephson current flowing through the
+superconductor/Rashba metal/superconductor junction, is also calculated.",1611.01737v2
+2014-05-09,Dicke-type phase transition in a spin-orbit coupled Bose-Einstein condensate,"Spin-orbit coupled Bose-Einstein condensates (BECs) provide a powerful tool
+to investigate interesting gauge-field related phenomena. We study the ground
+state properties of such a system and show that it can be mapped to the
+well-known Dicke model in quantum optics, which describes the interactions
+between an ensemble of atoms and an optical field. A central prediction of the
+Dicke model is a quantum phase transition between a superradiant phase and a
+normal phase. Here we detect this transition in a spin-orbit coupled BEC by
+measuring various physical quantities across the phase transition. These
+quantities include the spin polarization, the relative occupation of the nearly
+degenerate single particle states, the quantity analogous to the photon field
+occupation, and the period of a collective oscillation (quadrupole mode). The
+applicability of the Dicke model to spin-orbit coupled BECs may lead to
+interesting applications in quantum optics and quantum information science.",1405.2132v1
+2012-05-21,Stationary States of Trapped Spin-Orbit-Coupled Bose-Einstein Condensates,"We numerically investigate low-energy stationary states of pseudospin-1
+Bose-Einstein condensates in the presence of Rashba-Dresselhaus-type spin-orbit
+coupling. We show that for experimentally feasible parameters and strong
+spin-orbit coupling, the ground state is a square vortex lattice irrespective
+of the nature of the spin-dependent interactions. For weak spin-orbit coupling,
+the lowest-energy state may host a single vortex. Furthermore, we analytically
+derive constraints that explain why certain stationary states do not emerge as
+ground states. Importantly, we show that the distinct stationary states can be
+observed experimentally by standard time-of-flight spinindependent absorption
+imaging.",1205.4601v4
+2019-12-04,Enhanced Edelstein effect and interdimensional effects in an electron gas with Rashba spin-orbit coupling interface,"We examine the bound-state and free-state contributions to the density of
+states in a three-dimensional electron gas with a two-dimensional interface
+with Rashba spin-orbit coupling. Confinement of electrons to the interface is
+achieved through the inclusion of an attractive potential in the interface.
+Motivation for our research comes from interest in heterostructure materials
+that exhibit the Edelstein and inverse Edelstein effects on surfaces or
+interfaces due to large Rashba spin-orbit coupling. By modifying the
+Hamiltonian of a three-dimensional free electron gas to include an interface
+with Rashba spin-orbit coupling and an attractive potential, we are able to
+calculate the bound-state and free-state wavefunctions and corresponding
+density of states analytically. We find that one of the spin-split energy bands
+in the interface has an upper bound, resulting in an enhancement of the
+Edelstein and inverse Edelstein effect.",1912.01804v1
+2023-11-09,Electronic g-factor and tunable spin-orbit coupling in a gate-defined InSbAs quantum dot,"We investigate transport properties of stable gate-defined quantum dots
+formed in an InSb$_{0.87}$As$_{0.13}$ quantum well. High $\textit{g}$-factor
+and strong spin-orbit-coupling make InSb$_x$As$_{1-x}$ a promising platform for
+exploration of topological superconductivity and spin-based devices. We extract
+a nearly isotropic in-plane effective $\textit{g}$-factor by studying the
+evolution of Coulomb blockade peaks and differential conductance as a function
+of the magnitude and direction of magnetic field. The in-plane
+$\textit{g}$-factors, $|g^*_{[1\bar{1}0]}|$ and $|g^*_{[110]}|$, range from 49
+- 58. Interestingly, this $\textit{g}$-factor is higher than that found in
+quantum dots fabricated from pure InSb quantum wells. We demonstrate tunable
+spin-orbit-coupling by tracking a spin-orbit-coupling mediated avoided level
+crossing between the ground state and an excited state in magnetic field. By
+increasing the electron density, we observed an increase in an avoided crossing
+separation, $\Delta_{SO}$. The maximum energy separation extracted is
+$\Delta_{SO}$$\sim$100 $\mu$eV.",2311.05693v1
+2018-04-06,Intrinsic Spin and Orbital Hall Effects from Orbital Texture,"We show theoretically that both intrinsic spin Hall effect (SHE) and orbital
+Hall effect (OHE) can arise in centrosymmetric systems through momentum-space
+orbital texture, which is ubiquitous even in centrosymmetric systems unlike
+spin texture. OHE occurs even without spin-orbit coupling (SOC) and is
+converted into SHE through SOC. The resulting spin Hall conductivity is large
+(comparable to that of Pt) but depends on the SOC strength in a nonmonotonic
+way. This mechanism is stable against orbital quenching. This work suggests a
+path for an ongoing search for materials with stronger SHE. It also calls for
+experimental efforts to probe orbital degrees of freedom in OHE and SHE.
+Possible ways for experimental detection are briefly discussed.",1804.02118v2
+2022-07-15,Tunable spin and orbital Edelstein effect at (111) LaAlO$_3$/SrTiO$_3$ interface,"Converting charge current into spin current is one of the main mechanisms
+exploited in spintronics. One prominent example is the Edelstein effect, namely
+the generation of a magnetization in response to an external electric field,
+which can be realized in systems with lack of inversion symmetry. If a system
+has electrons with an orbital angular momentum character, an orbital
+magnetization can be generated by the applied electric field giving rise to the
+so-called orbital Edelstein effect. Oxide heterostructures are the ideal
+platform for these effects due to the strong spin-orbit coupling and the lack
+of inversion symmetries. Beyond a gate-tunable spin Edelstein effect, we
+predict an orbital Edelstein effect an order of magnitude larger then the spin
+one at the (111) LaAlO$_3$/SrTiO$_3$ interface. We model the material as a
+bilayer of $t_{2g}$ orbitals using a tight-binding approach, while transport
+properties are obtained in the Boltzmann approach. We give an effective model
+at low filling which explains the non-trivial behaviour of the Edelstein
+response, showing that the hybridization between the electronic bands crucially
+impacts the Edelstein susceptibility.",2207.07663v1
+2022-12-28,Intrinsic orbital and spin Hall effect in bismuth semimetal,"We investigate the intrinsic orbital Hall conductivity (OHC) and spin Hall
+conductivity (SHC) in a bismuth semimetal, by employing an sp-orbital
+tight-binding model. We report a notable difference between the anisotropy of
+OHC and SHC whose orbital and spin polarizations lie within the basal plane. We
+do not observe a substantial correlation between the orbital and spin Berry
+curvatures with spin-orbit coupling (SOC) at the Fermi energy, disproving the
+correlation between OHC and SHC in a strong SOC regime. We argue the huge SHC
+in a Bi semimetal is attributed to its gigantic SOC which strongly affects the
+hybridization of the p orbitals, despite its relatively small magnitude of OHC.
+We hope the distinct anisotropy of OHC and SHC provides a feasible means to
+differentiate between the two effects in experiments.",2212.13891v2
+2024-03-12,Negative orbital Hall effect in Germanium,"Our investigation reveals a groundbreaking discovery of a negative inverse
+orbital Hall effect (IOHE) in Ge thin films. We employed the innovative orbital
+pumping technique where spin-orbital coupled current is injected into Ge films
+using YIG/Pt(2)/Ge($t_{Ge}$) and YIG/W(2)/Ge($t_{Ge}$) heterostructures.
+Through comprehensive analysis, we observe significant reductions in the
+signals generated by coherent (RF-driven) and incoherent (thermal-driven)
+spin-orbital pumping techniques. These reductions are attributed to the
+presence of a remarkable strong negative IOHE in Ge, showing its magnitude
+comparable to the spin-to-charge signal in Pt. Our findings reveal that
+although the spin-to-charge conversion in Ge is negligible, the
+orbital-to-charge conversion exhibits large magnitude. Our results are
+innovative and pioneering in the investigation of negative IOHE by the
+injection of spin-orbital currents.",2403.07254v1
+1999-02-09,The effect of the spin-orbit geometric phase on the spectrum of Aharonov-Bohm oscillations in a semiconductor mesoscopic ring,"Taking into account the spin precession caused by the spin-orbit splitting of
+the conduction band in semiconductor quantum wells, we have calculated the
+Fourier spectra of conductance and state-density correlators in a 2D ring, in
+order to investigate the structure of the main peak corresponding to
+Aharonov-Bohm oscillations. In narrow rings the peak structure is determined by
+the competition between the spin-orbit and the Zeeman couplings. The latter
+leads to a peak broadening, and produces the peak splitting in the
+state-density Fourier spectrum. We have found an oscillation of the peak
+intensity as a function of the spin-orbit coupling constant, and this effect of
+the quantum interference caused by the spin geometric phase is destroyed with
+increasing Zeeman coupling.",9902122v1
+2011-08-08,Two-Impurity Kondo Model: Spin-Orbit Interactions and Entanglement,"Motivated by proposals to employ RKKY-coupled spins as building blocks in a
+solid-state quantum computer, we analyze how the RKKY interaction in a 2D
+electron gas is influenced by spin-orbit interactions. Using a two-impurity
+Kondo model with added Dresselhaus and Rashba spin-orbit interactions we find
+that spin-rotational invariance of the RKKY interaction - essential for having
+a well-controllable two-qubit gate - is restored when tuning the Rashba
+coupling to have the same strength as the Dresselhaus coupling. We also discuss
+the critical properties of the two-impurity Kondo model in the presence of
+spin-orbit interactions, and extract the leading correction to the block
+entanglement scaling due to these interactions.",1108.1817v1
+2011-10-03,Spin selective transport through helical molecular systems,"Highly spin selective transport of electrons through a helically shaped
+electrostatic potential is demonstrated in the frame of a minimal model
+approach. The effect is significant even in the case of weak spin-orbit
+coupling. Two main factors determine the selectivity, an unconventional Rashba-
+like spin-orbit interaction, reflecting the helical symmetry of the system, and
+a weakly dispersive electronic band of the helical system. The weak electronic
+coupling, associated with the small dispersion, leads to a low mobility of the
+charges in the system and allows even weak spin-orbit interactions to be
+effective. The results are expected to be generic for chiral molecular systems
+displaying low spin-orbit coupling and low conductivity.",1110.0354v2
+2016-06-08,Current driven spin-orbit torque oscillator: ferromagnetic and antiferromagnetic coupling,"We consider theoretically the impact of Rashba spin-orbit coupling on spin
+torque oscillators (STOs) in synthetic ferromagnets and antiferromagnets that
+have either a bulk multilayer or a thin film structure. The synthetic magnets
+consist of a fixed polarizing layer and two free magnetic layers that interact
+through the Ruderman-Kittel-Kasuya-Yosida interaction. We determine
+analytically which collinear states along the easy axis that are stable, and
+establish numerically the phase diagram for when the system is in the STO mode
+and when collinear configurations are stable, respectively. It is found that
+the Rashba spin-orbit coupling can induce anti-damping in the vicinity of the
+collinear states, which assists the spin transfer torque in generating
+self-sustained oscillations, and that it can substantially increase the STO
+part of the phase diagram. Moreover, we find that the STO phase can extend deep
+into the antiferromagnetic regime in the presence of spin-orbit torques.",1606.02720v2
+2013-08-08,Strong coupling theory of spin and orbital excitations in Sr2IrO4,"We study the low-lying excitations in 5d transition-metal oxide Sr_2IrO_4 on
+the localized electron picture. We find that Hund's coupling together with the
+spin-orbit interaction leads to exchange anisotropy which causes the spin wave
+gap. Introducing the isospin operators acting on Kramers' doublet in Ir atoms,
+we derive the effective spin Hamiltonian from a multi-orbital Hubbard model
+with the t_{2g} orbitals in the square lattice. We introduce the Green's
+functions including the anomalous type for the boson operators by expanding the
+spin operators in terms of boson operators in the lowest order of 1/S, and
+solve the coupled equations of motion for those functions. Two modes are found
+to emerge with slightly different energies, in contrast to the spin waves in
+the isotropic Heisenberg model. At the $\Gamma$-point, one mode has the zero
+excitation energy while another has a finite energy. They have the same
+excitation energy at the M point, but still have different energies at the X
+point.",1308.1816v2
+2019-04-21,Generation and detection of spin-orbit coupled neutron beams,"Spin-orbit coupling of light has come to the fore in nano-optics and
+plasmonics, and is a key ingredient of topological photonics and chiral quantum
+optics. We demonstrate a basic tool for incorporating analogous effects into
+neutron optics: the generation and detection of neutron beams with coupled spin
+and orbital angular momentum. $^3$He neutron spin-filters are used in
+conjunction with specifically oriented triangular coils to prepare neutron
+beams with lattices of spin-orbit correlations, as demonstrated by their
+spin-dependant intensity profiles. These correlations can be tailored to
+particular applications, such as neutron studies of topological materials.",1904.09520v1
+2023-05-23,Emergent correlated phases in rhombohedral trilayer graphene induced by proximity spin-orbit and exchange coupling,"The impact of proximity-induced spin-orbit and exchange coupling on the
+correlated phase diagram of rhombohedral trilayer graphene (RTG) is
+investigated theoretically. By employing \emph{ab initio}-fitted effective
+models of RTG encapsulated by transition metal dichalcogenides (spin-orbit
+proximity effect) and ferromagnetic Cr$_2$Ge$_2$Te$_6$ (exchange proximity
+effect), we incorporate the Coulomb interactions within the random-phase
+approximation to explore potential correlated phases at different displacement
+field and doping. We find a rich spectrum of spin-valley resolved Stoner and
+intervalley coherence instabilities induced by the spin-orbit proximity
+effects, such as the emergence of a \textit{spin-valley-coherent} phase due to
+the presence of valley-Zeeman coupling. Similarly, proximity exchange removes
+the phase degeneracies by biasing the spin direction, enabling a
+magneto-correlation effect -- strong sensitivity of the correlated phases to
+the relative magnetization orientations (parallel or antiparallel) of the
+encapsulating ferromagnetic layers.",2305.14277v2
+2009-03-02,Proposed Orbital Ordering in MnV2O4 from First-principles Calculations,"Based on density functional calculations, we propose a possible orbital
+ordering in MnV2O4 which consists of orbital chains running along
+crystallographic a and b directions with orbitals rotated alternatively by
+about 45 degrees within each chain. We show that the consideration of
+correlation effects as implemented in the local spin density approximation
+(LSDA)+U approach is crucial for a correct description of the space group
+symmetry. This implies that the correlation-driven orbital ordering has a
+strong influence on the structural transitions in this system. Inclusion of
+spin-orbit effects does not seem to influence the orbital ordering pattern. We
+further find that the proposed orbital arrangement favours a noncollinear
+magnetic ordering of V spins, as observed experimentally. Exchange couplings
+among V spins are also calculated and discussed.",0903.0254v2
+2022-02-24,Orbital entangled antiferromagnetoc order and spin-orbit-distortion exciton in $\rm Sr_2VO_4$,"With electron filling $n=1$ in the $\rm Sr_2VO_4$ compound, the octahedrally
+coordinated $t_{\rm 2g}$ orbitals are strongly active due to tetragonal
+distortion induced crystal field tuning by external agent such as pressure.
+Considering the full range of crystal field induced tetragonal splitting in a
+realistic three-orbital model, collective spin-orbital excitations are
+investigated using the generalized self consistent and fluctuation approach.
+The variety of self consistent states obtained including orbital entangled
+ferromagnetic and antiferromagnetic orders reflects the rich spin-orbital
+physics resulting from the interplay between the band, spin-orbit coupling,
+crystal field, and Coulomb interaction terms. The behavior of the calculated
+energy scales of collective excitations with crystal field is consistent with
+that of the transition temperatures with pressure as obtained from
+susceptibility and resistivity anomalies in high-pressure studies.",2202.11971v1
+2023-07-05,Monopole-like orbital-momentum locking and the induced orbital transport in topological chiral semimetals,"The interplay between chirality and topology nurtures many exotic electronic
+properties. For instance, topological chiral semimetals display multifold
+chiral fermions that manifest nontrivial topological charge and spin texture.
+They are an ideal playground for exploring chirality-driven exotic physical
+phenomena. In this work, we reveal a monopole-like orbital-momentum locking
+texture on the three-dimensional Fermi surfaces of topological chiral
+semimetals with B20 structures (e.g., RhSi and PdGa). This orbital texture
+enables a large orbital Hall effect (OHE) and a giant orbital magnetoelectric
+(OME) effect in the presence of current flow. Different enantiomers exhibit the
+same OHE which can be converted to the spin Hall effect by spin-orbit coupling
+in materials. In contrast, the OME effect is chirality-dependent and much
+larger than its spin counterpart. Our work reveals the crucial role of orbital
+texture for understanding OHE and OME effects in topological chiral semimetals
+and paves the path for applications in orbitronics, spintronics, and enantiomer
+recognition.",2307.02668v2
+2008-09-08,Interplay between quantum dissipation and an in-plane magnetic field in the spin ratchet effect,"We investigate the existence of the pure spin ratchet effect in a dissipative
+quasi-one-dimensional system with Rashba spin-orbit interaction. The system is
+additionally placed into a transverse uniform stationary in-plane magnetic
+field. It is shown that the effect exists at low temperatures and pure spin
+currents can be generated by applying an unbiased ac driving to the system. An
+analytical expression for the ratchet spin current is derived. From this
+expression it follows that the spin ratchet effect appears as a result of the
+simultaneous presence of the spin-orbit interaction, coupling between the
+orbital degrees of freedom and spatial asymmetry. In this paper we consider the
+case of a broken spatial symmetry by virtue of asymmetric periodic potentials.
+It turns out that an external magnetic field does not have any impact on the
+existence of the spin ratchet effect, but it influences its efficiency
+enhancing or reducing the magnitude of the spin current.",0809.1296v2
+2006-05-23,Zero-bias spin separation,"Spin-orbit coupling provides a versatile tool to generate and to manipulate
+the spin degree of freedom in low-dimensional semiconductor structures. The
+spin Hall effect, where an electrical current drives a transverse spin current
+and causes a nonequilibrium spin accumulation observed near the sample
+boundary, the spin-galvanic effect, where a nonequilibrium spin polarization
+drives an electric current, or the reverse process, in which an electrical
+current generates a nonequilibrium spin polarization, are all consequences of
+spin-orbit coupling. In order to observe a spin Hall effect a bias driven
+current is an essential prerequisite. The spin separation is caused via
+spin-orbit coupling either by Mott scattering (extrinsic spin Hall effect) or
+by Rashba or Dresselhaus spin splitting of the band structure (intrinsic spin
+Hall effect). Here we provide evidence for an elementary effect causing spin
+separation which is fundamentally different from that of the spin Hall effect.
+In contrast to the spin Hall effect it does not require an electric current to
+flow: It is spin separation achieved by spin-dependent scattering of electrons
+in media with suitable symmetry. We show that by free carrier (Drude)
+absorption of terahertz radiation spin separation is achieved in a wide range
+of temperatures from liquid helium up to room temperature. Moreover the
+experimental results give evidence that simple electron gas heating by any
+means is already sufficient to yield spin separation due to spin-dependent
+energy relaxation processes of nonequilibrium carriers.",0605556v2
+2013-06-18,The confinement induced resonance in spin-orbit coupled cold atoms with Raman coupling,"We investigate the confinement induced resonance in spin-orbit coupled cold
+atoms with Raman coupling. We find that the quasi-bound levels induced by the
+spin-orbit coupling and Raman coupling result in the Feshbach-type resonances.
+For sufficiently large Raman coupling, the bound states in one dimension exist
+only for sufficiently strong attractive interaction. Furthermore, the bound
+states in quasi-one dimension exist only for sufficient large ratio of the
+length scale of confinement to three dimensional s-wave scattering length. The
+Raman coupling substantially changes the confinement-induced resonance
+position. We give a proposal to realize confinement induced resonance by
+increasing the Raman coupling strength in experiments.",1306.4099v5
+2023-05-11,Photo-induced Non-collinear Interlayer RKKY Coupling in Bulk Rashba Semiconductors,"The interplay between light-matter, spin-orbit, and magnetic interactions
+allows the investigation of light-induced magnetic phenomena that is otherwise
+absent without irradiation. We present our analysis of light-driving effects on
+the interlayer exchange coupling mediated by a bulk Rashba semiconductor in a
+magnetic multilayer. The collinear magnetic exchange coupling mediated by the
+photon-dressed spin-orbit coupled electrons of BiTeI develops light-induced
+oscillation periods and displays new decay powers laws, both of which are
+enhanced with an increasing light-matter coupling. For magnetic layers with
+non-collinear magnetization, we find a non-collinear magnetic exchange coupling
+uniquely generated by light-driving of the multilayer. As the non-collinear
+magnetic exchange coupling mediated by the electrons of BiTeI is unique to the
+irradiated system and it is enhanced with increasing light-matter coupling,
+this effect offers a promising platform of investigation of light-driving
+effects on magnetic phenomena in spin-orbit coupled systems.",2305.06861v1
+2003-07-11,To the origin of large reduction of the effective moment in Na2V3O7,"We have shown that the observed large reduction of the effective moment in
+Na2V3O7 may be caused by conventional crystal-field interactions and the
+intra-atomic spin-orbit coupling of the V4+ ion. The fine discrete electronic
+structure of the 3d1 configuration with the weakly-magnetic Kramers-doublet
+ground state, caused by the large orbital moment, is the reason for anomalous
+properties of Na2V3O7. Moreover, according to the Quantum Atomistic Solid-State
+Theory (QUASST), Na2V3O7 is expected to exhibit pronounced heavy-fermion
+phenomena at low temperatures.
+  PACS No: 71.70.E; 75.10.D
+  Keywords: crystal-field interactions, spin-orbit coupling, orbital moment.
+Na2V3O7",0307272v2
+2009-04-20,Tunneling anisotropic magnetoresistance in Fe/GaAs/Au junctions: orbital effects,"We report experiments on epitaxially grown Fe/GaAs/Au tunnel junctions
+demonstrating that the tunneling anisotropic magnetoresistance (TAMR) effect
+can be controlled by a magnetic field. Theoretical modelling shows that the
+interplay of the orbital effects of a magnetic field and the Dresselhaus
+spin-orbit coupling in the GaAs barrier leads to an independent contribution to
+the TAMR effect with uniaxial symmetry, whereas the Bychkov-Rashba spin-orbit
+coupling does not play a role. The effect is intrinsic to barriers with bulk
+inversion asymmetry.",0904.3017v1
+2017-11-01,Tuning Ising superconductivity with layer and spin-orbit coupling in two-dimensional transition-metal dichalcogenides,"Systems that simultaneously exhibit superconductivity and spin-orbit coupling
+are predicted to provide a route toward topological superconductivity and
+unconventional electron pairing, driving significant contemporary interest in
+these materials. Monolayer transition-metal dichalcogenide (TMD)
+superconductors in particular lack inversion symmetry, enforcing a spin-triplet
+component of the superconducting wavefunction that increases with the strength
+of spin-orbit coupling. In this work, we present an experimental and
+theoretical study of two intrinsic TMD superconductors with large spin-orbit
+coupling in the atomic layer limit, metallic 2H-TaS$_2$ and 2H-NbSe$_2$. For
+the first time in TaS$_2$, we investigate the superconducting properties as the
+material is reduced to a monolayer and show that high-field measurements point
+to the largest upper critical field thus reported for an intrinsic TMD
+superconductor. In few-layer samples, we find that the enhancement of the upper
+critical field is sustained by the dominance of spin-orbit coupling over weak
+interlayer coupling, providing additional platforms for unconventional
+superconducting states in two dimensions.",1711.00468v1
+2004-05-19,Spin-Hall transport of heavy holes in III-V semiconductor quantum wells,"We investigate spin transport of heavy holes in III-V semiconductor quantum
+wells in the presence of spin-orbit coupling of the Rashba type due to
+structure-inversion asymmetry. Similarly to the case of electrons, the
+longitudinal spin conductivity vanishes, whereas the off-diagonal elements of
+the spin-conductivity tensor are finite giving rise to an intrinsic spin-Hall
+effect. For a clean system we find a closed expression for the spin-Hall
+conductivity depending on the length scale of the Rashba coupling and the hole
+density. In this limit the spin-Hall conductivity is enhanced compared to its
+value for electron systems, and it vanishes with increasing strength of the
+impurity scattering. As an aside, we also derive explicit expressions for the
+Fermi momenta and the densities of holes in the different dispersion branches
+as a function of the spin-orbit coupling parameter and the total hole density.
+These results are of relevance for the interpretation of possible Shubnikov-de
+Haas measurements detecting the Rashba spin splitting.",0405436v4
+2006-04-06,Shot Noise of Spin-Decohering Transport in Spin-Orbit Coupled Nanostructures,"We generalize the scattering theory of quantum shot noise to include the full
+spin-density matrix of electrons injected from a spin-filtering or
+ferromagnetic electrode into a quantum-coherent nanostructure governed by
+various spin-dependent interactions. This formalism yields the spin-resolved
+shot noise power for different experimental measurement setups--with
+ferromagnetic source and ferromagnetic or normal drain electrodes--whose
+evaluation for the diffusive multichannel quantum wires with the Rashba (SO)
+spin-orbit coupling shows how spin decoherence and dephasing lead to
+substantial enhancement of charge current fluctuations (characterized by Fano
+factors $> 1/3$). However, these processes and the corresponding shot noise
+increase are suppressed in narrow wires, so that charge transport experiments
+measuring the Fano factor $F_{\uparrow \to \uparrow \downarrow}$ in a
+ferromagnet/SO-coupled-wire/paramagnet setup also quantify the degree of
+phase-coherence of transported spin--we predict a one-to-one correspondence
+between the magnitude of the spin polarization vector and $F_{\uparrow \to
+\uparrow \downarrow}$.",0604187v2
+2020-05-18,Spin squeezing in a spin-orbit coupled Bose-Einstein condensate,"We study the spin squeezing in a spin-1/2 Bose-Einstein condensates (BEC)
+with Raman induced spin-orbit coupling (SOC). Under the condition of two-photon
+resonance and weak Raman coupling strength, the system possesses two degenerate
+ground states, using which we construct an effective two-mode model. The
+Hamiltonian of the two-mode model takes the form of the one-axis-twisting
+Hamiltonian which is known to generate spin squeezing. More importantly, we
+show that the SOC provides a convenient control knob to adjust the spin
+nonlinearity responsible for spin squeezing. Specifically, the spin
+nonlinearity strength can be tuned to be comparable to the two-body
+density-density interaction, hence is much larger than the intrinsic
+spin-dependent interaction strength in conventional two-component BEC systems
+such as $^{87}$Rb and $^{23}$Na in the absence of the SOC. We confirm the spin
+squeezing by carrying out a fully beyond-mean-field numerical calculation using
+the truncated Wigner method. Additionally, the experimental implementation is
+also discussed.",2005.08532v2
+2021-03-10,Electric-dipole-induced resonance and decoherence of a dressed spin in a quantum dot,"Electron spin qubit in a quantum dot has been studied extensively for
+scalable quantum information processing over the past two decades. Recently,
+high-fidelity and fast single-spin control and strong spin-photon coupling have
+been demonstrated using a synthetic spin-orbit coupling created by a
+micromagnet. Such strong electrical driving suggests a strongly coupled
+spin-photon system. Here we study the relaxation, pure dephasing, and
+electrical manipulation of a dressed-spin qubit based on a driven single
+electron in a quantum dot. We find that the pure dephasing of a dressed qubit
+due to charge noise can be suppressed substantially at a sweet spot of the
+dressed qubit. The relaxation at low magnetic fields exhibits non-monotonic
+behavior due to the energy compensation from the driving field. Moreover, the
+longitudinal component of the synthetic spin-orbit field could provide fast
+electric-dipole-induced dressed-spin resonance (EDDSR). Based on the slow
+dephasing and fast EDDSR, we further propose a scheme for dressed-spin-based
+semiconductor quantum computing.",2103.05817v1
+2022-01-04,Mechanism of antisymmetric spin polarization in centrosymmetric multiple-$Q$ magnets based on bilinear and biquadratic spin cross products,"We investigate how to engineer an antisymmetric spin-split band structure
+under spin density waves with finite ordering wave vectors in centrosymmetric
+systems without the relativistic spin-orbit coupling. On the basis of a
+perturbative analysis for the spin-charge coupled model in centrosymmetric
+itinerant magnets, we show that nonzero chiral-type bilinear and biquadratic
+spin cross products in momentum space under the magnetic orderings are related
+to an antisymmetric spin polarization in the electronic band structure. We
+apply the derived formula to the single-$Q$ cycloidal spiral and double-$Q$
+noncoplanar states including the meron-antimeron and skyrmion crystals. Our
+results present a clue to realize a giant antisymmetric spin splitting driven
+by magnetic phase transitions in the centrosymmetric lattice structures without
+the spin-orbit coupling.",2201.01354v1
+2003-04-09,Weak localization and conductance fluctuations in a quantum dot with parallel magnetic field and spin-orbit scattering,"In the presence of both spin-orbit scattering and a magnetic field the
+conductance of a chaotic GaAs quantum dot displays quite a rich behavior. Using
+a Hamiltonian derived by Aleiner and Falko [Phys. Rev. Lett. 87, 256801 (2001)]
+we calculate the weak localization correction and the covariance of the
+conductance, as a function of parallel and perpendicular magnetic field and
+spin-orbit coupling strength. We also show how the combination of an in-plane
+magnetic field and spin-orbit scattering gives rise to a component to the
+magnetoconductance that is anti-symmetric with respect to reversal of the
+perpendicular component of the magnetic field and how spin-orbit scattering
+leads to a ""magnetic-field echo"" in the conductance autocorrelation function.
+Our results can be used for a measurement of the Dresselhaus and Bychkov-Rashba
+spin-orbit scattering lengths in a GaAs/GaAlAs heterostructure.",0304222v1
+2006-05-15,Entanglements in Systems with Multiple Degrees of Freedom,"We present the entanglement properties of the spin-orbital coupling systems
+with multiple degrees of freedom. After constructing the maximally entangled
+spin-orbital basis of bipartite, we find that the quantum entanglement length
+in the noninteracting itinerant Fermion system with spin and orbit is
+considerably larger than that in the system with only spin. In the
+SU(2)$\otimes$SU(2) spin-orbital interacting system, the entanglement,
+expressed in terms of the spin-orbital correlation functions, clearly manifests
+the close relationship with the quantum phases in strongly correlated systems;
+and the entanglement phase diagram of the finite-size systems is in agreement
+with the magnetic and orbital phase diagram of the infinite systems. The
+application of the present theory on nucleon systems is suggested.",0605378v1
+2009-08-06,Finite temperature spin-dynamics and phase transitions in spin-orbital models,"We study finite temperature properties of a generic spin-orbital model
+relevant to transition metal compounds, having coupled quantum Heisenberg-spin
+and Ising-orbital degrees of freedom. The model system undergoes a phase
+transition, consistent with that of a 2D Ising model, to an orbitally ordered
+state at a temperature set by short-range magnetic order. At low temperatures
+the orbital degrees of freedom freeze-out and the model maps on to a quantum
+Heisenberg model. The onset of orbital excitations causes a rapid scrambling of
+the spin spectral weight away from coherent spin-waves, which leads to a sharp
+increase in uniform magnetic susceptibility just below the phase transition,
+reminiscent of the observed behavior in the Fe-pnictide materials.",0908.0800v2
+2016-02-22,Spin-Orbit States of Neutron Wavepackets,"We propose a method to prepare an entangled spin-orbit state between the spin
+and the orbital angular momenta of a neutron wavepacket. This spin-orbit state
+is created by passing neutrons through the center of a quadrupole magnetic
+field, which provides a coupling between the spin and orbital degrees of
+freedom. A Ramsey fringe type measurement is suggested as a means of verifying
+the spin-orbit correlations.",1602.06644v2
+2018-10-31,"Chern number spectrum of ultra-cold fermions in optical lattices tuned independently via artificial magnetic, Zeeman and spin-orbit fields","We discuss the Chern number spectrum of ultra-cold fermions in square optical
+lattices as a function of artificial magnetic, Zeeman and spin-orbit fields
+that can be tuned independently. We show the existence of topological quantum
+phase transitions induced by Zeeman and spin-orbit fields, where the total
+number and chirality of edge states change for fixed magnetic flux ratio, thus
+leading to topological-insulator phases which are different from those found at
+zero Zeeman and spin-orbit fields. We construct phase diagrams of chemical
+potential versus Zeeman field or spin-orbit coupling and characterize all
+insulating phases by their topological invariants. Lastly, we obtain a
+staircase structure in the filling factor versus chemical potential for various
+Zeeman and spin-orbit fields, showing the existence of incompressible states at
+rational filling factors derived from a generalized Diophantine equation.",1811.00136v1
+2011-11-07,Rashba spin orbit interaction in a quantum wire superlattice,"In this work we study the effects of a longitudinal periodic potential on a
+parabolic quantum wire defined in a two-dimensional electron gas with Rashba
+spin-orbit interaction. For an infinite wire superlattice we find, by direct
+diagonalization, that the energy gaps are shifted away from the usual Bragg
+planes due to the Rashba spin-orbit interaction. Interestingly, our results
+show that the location of the band gaps in energy can be controlled via the
+strength of the Rashba spin-orbit interaction. We have also calculated the
+charge conductance through a periodic potential of a finite length via the
+non-equilibrium Green's function method combined with the Landauer formalism.
+We find dips in the conductance that correspond well to the energy gaps of the
+infinite wire superlattice. From the infinite wire energy dispersion, we derive
+an equation relating the location of the conductance dips as a function of the
+(gate controllable) Fermi energy to the Rashba spin-orbit coupling strength. We
+propose that the strength of the Rashba spin-orbit interaction can be extracted
+via a charge conductance measurement.",1111.1534v1
+2019-03-06,Effects of geometry on spin-orbit Kramers states in semiconducting nanorings,"The holonomic manipulation of spin-orbital degenerate states, encoded in the
+Kramers doublet of narrow semiconducting channels with spin-orbit interaction,
+is shown to be intimately intertwined with the geometrical shape of the
+nanostructures. The presence of doubly degenerate states is not sufficient to
+guarantee a non-trivial mixing by only changing the Rashba spin-orbit coupling.
+We demonstrate that in nanoscale quantum rings the combination of arbitrary
+inhomogeneous curvature and adiabatic variation of the spin-orbit amplitude,
+e.g. through electric-field gating, can be generally employed to get
+non-trivial combinations of the degenerate states. Shape symmetries of the
+nanostructure act to constrain the adiabatic quantum evolution. While for
+circular rings the geometric phase is not generated along a non-cyclic path in
+the parameters space, remarkably, for generic mirror-symmetric shape deformed
+rings the spin-orbit driving can lead to a series of dynamical quantum phase
+transitions. We explicitly show this occurrence and propose a route to detect
+such topological transitions by measuring a variation of the electron tunneling
+amplitude into the semiconducting channel.",1903.02455v1
+2019-04-06,Spin-orbit effects in the hydrogenic impurity levels of wurtzite semiconductors,"The corrections to the $E_2^*$ energy level of hydrogenic impurities in
+semiconductors with wurtzite crystal structure are calculated using first-order
+perturbation theory in the envelope-function approximation. We consider the
+intrinsic (Dresselhaus) spin-orbit effective Hamiltonian in the conduction band
+and compare its effects to the renormalized extrinsic (Rashba) spin-orbit
+interaction which is analogous to the spin-orbit interaction in the bare
+hydrogen atom. In order to evaluate the extrinsic spin-orbit interaction we
+obtain the renormalized coupling constant $\lambda^*$ for wurtzite
+semiconductors from 8-band Kane theory. We apply our theory to four
+representative binary semiconductors with wurtzite crystal structure, namely,
+GaN, ZnO, InN and AlN, and discuss the relative strength of the effects of the
+intrinsic and extrinsic spin-orbit contributions.",1904.03374v1
+2019-12-19,Magnetic phase transitions in quantum spin-orbital liquids,"We investigate the spin and orbital correlations of a superexchange model
+with spin $S=1$ and orbital $L=1$ relevant for $5d^4$ transition metal Mott
+insulators, using exact diagonalization and density matrix renormalization
+group (DMRG). For spin-orbit coupling $\lambda=0$, the orbitals are in an
+entangled state that is decoupled from the spins. We find two phases with
+increasing $\lambda$: (I) the S2 phase with two peaks in the structure factor
+for $\lambda\le\lambda_{c1}\approx 0.34 J$ where $J$ is the ferromagnetic
+exchange; and, (II) the $S1$ phase for
+$\lambda_{c1}<\lambda\le\lambda_{c2}\approx 1.2 J$ with emergent
+antiferromagnetic correlations. Both S1 and S2 phases are shown to exhibit
+power law correlations, indicative of a gapless spectrum. Upon increasing
+$\lambda > \lambda_{c2}$ leads to a product state of local spin-orbital
+singlets that exhibit exponential decay of correlations, indicative of a gapped
+phase. We obtain insights into the phases from the well-known
+Uimin-Lai-Sutherland (ULS) model in an external field that provides an
+approximate description of our model within mean field theory.",1912.09516v1
+2008-05-15,Orbital fluctuation mechanism for superconductivity in iron-based compounds,"We propose orbital fluctuations in a multi-band ground state as the
+superconducting pairing mechanism in the new iron-based materials. We develop a
+general SU(4) theoretical framework for studying a two-orbital model and
+discuss a number of scenarios that may be operational within this orbital
+fluctuation paradigm. The orbital and spin symmetry of the superconducting
+order parameter is argued to be highly non-universal and dependent on the
+details of the underlying band structure. We introduce a minimal two-orbital
+model for the Fe-pnictides characterized by non-degenerate orbitals that
+strongly mix with each other. They correspond to the iron ""d_xy"" orbital and to
+an effective combination of ""d_zx"" and ""d_zy"", respectively. Using this
+effective model we perform RPA calculations of susceptibilities and effective
+pairing interactions. We find that spin and orbital fluctuations are,
+generally, strongly coupled and we identify the parameters that control this
+coupling as well as the relative strength of various channels.",0805.2150v2
+2000-04-11,Spin Effects in the Local Density of States of GaAs,"We present spin-resolved measurements of the local density of states in Si
+doped GaAs. Both spin components exhibit strong mesoscopic fluctuations. In the
+magnetic quantum limit, the main features of the spin-up and spin-down
+components of the local density of states are found to be identical apart from
+Zeeman splitting. Based on this observation, we introduce a mesoscopic method
+to measure the $g$-factor in a material where macroscopic methods are severely
+restricted by disorder. Differences between the spin-up and spin-down
+components are discussed in terms of spin relaxation due to spin-orbit
+coupling.",0004165v1
+2005-09-16,Streda-like formula in spin Hall effect,"A generalized Streda formula is derived for the spin transport in spin-orbit
+coupled systems. As compared with the original Streda formula for charge
+transport, there is an extra contribution of the spin Hall conductance whenever
+the spin is not conserved. For recently studied systems with quantum spin Hall
+effect in which the z-component spin is conserved, this extra contribution
+vanishes and the quantized value of spin Hall conductivity can be reproduced in
+the present approach. However, as spin is not conserved in general, this extra
+contribution can not be neglected, and the quantization is not exact.",0509453v1
+2011-06-23,Spin dephasing in Silicon Germanium nanowires,"We study spin polarized transport in silicon germanium nanowires using a
+semiclassical monte carlo approach. Spin depolarization in the channel is
+caused due to D'yakonov-Perel (DP) relaxation associated with Rashba spin orbit
+coupling and due to Elliott- Yafet (EY) relaxation. We investigate the
+dependence of spin dephasing on germanium mole fraction in silicon germanium
+nanowires. The spin dephasing lengths decrease with an increase in the
+germanium mole fraction. We also find that the temperature has a strong
+influence on the dephasing rate and spin relaxation lengths increase with
+decrease in temperature. The ensemble averaged spin components and the steady
+state distribution of spin components vary with initial polarization.",1106.4619v1
+2014-04-26,Slow spin relaxation in a quantum Hall ferromagnet state,"Electron spin relaxation in a spin-polarized quantum Hall state is studied.
+Long spin relaxation times that are at least an order of magnitude longer than
+those measured in previous experiments were observed and explained within the
+spin-exciton relaxation formalism. Absence of any dependence of the spin
+relaxation time on the electron temperature and on the spin-exciton density,
+and specific dependence on the magnetic field indicate the definite relaxation
+mechanism -- spin-exciton annihilation mediated by spin-orbit coupling and
+smooth random potential.",1404.6521v1
+2014-08-07,Spin Hanle effect in mesoscopic superconductors,"We present a theoretical study of spin transport in a superconducting
+mesoscopic spin valve under the action of a magnetic field misaligned with
+respect to the injected spin. We demonstrate that superconductivity can either
+strongly enhance or suppress the coherent spin rotation depending on the type
+of spin relaxation mechanism being dominated either by spin-orbit coupling or
+spin-flip scattering at impurities. We also predict a hitherto unknown subgap
+contribution to the nonlocal conductance in multiterminal superconducting
+hybrid structures which completely eliminates the effect of spin rotation at
+sufficiently low temperatures.",1408.1632v2
+2016-03-05,Datta-and-Das spin transistor controlled by a high-frequency electromagnetic field,"We developed the theory of spin dependent transport through a spin-modulator
+device (so-called Datta-and-Das spin transistor) in the presence of a
+high-frequency electromagnetic field (dressing field). Solving the
+Schr\""odinger problem for dressed electrons, we demonstrated that the field
+drastically modifies the spin transport. In particular, the dressing field
+leads to renormalization of spin-orbit coupling constants that varies
+conductivity of the spin transistor. The present effect paves the way for
+controlling the spin-polarized electron transport with light in prospective
+spin-optronic devices.",1603.01678v2
+2017-11-15,Orbital physics in transition metal compounds: new trends,"In the present review different effects related to the orbital degrees of
+freedom are discussed. Leaving aside such aspects as the superexchange
+mechanism of the cooperative Jahn-Teller distortions and different properties
+of ""Kugel-Khomskii""-like models, we mostly concentrate on other phenomena,
+which are in the focus of the modern condensed matter physics. After a general
+introduction we start with the discussion of the concept of effective reduction
+of dimensionality due to orbital degrees of freedom and consider such phenomena
+as the orbitally-driven Peierls effect and the formation of small clusters of
+ions in the vicinity of a Mott transition, which behave like ""molecules""
+embedded in a solid. The second large section is devoted to the
+orbital-selective effects such as the orbital-selective Mott transition and the
+suppression of magnetism due to the fact that part of the orbitals start to
+form singlet molecular orbitals. At the end the rapidly growing field of the
+so-called ""spin-orbit-dominated"" transition metal compounds is briefly reviewed
+including such topics as the interplay between the spin-orbit coupling and the
+Jahn-Teller effect, the formation of the spin-orbit driven Mott and Peierls
+states, the role of orbital degrees of freedom in generation of the Kitaev
+exchange coupling, and the singlet (excitonic) magnetism in $4d$ and $5d$
+transition metal compounds.",1711.05409v2
+2016-09-15,Diffused vorticity and moment of inertia of a spin-orbit coupled Bose-Einstein condensate,"By developing the hydrodynamic theory of spinor superfluids we calculate the
+moment of inertia of a harmonically trapped Bose-Einstein condensate with
+spin-orbit coupling. We show that the velocity field associated with the
+rotation of the fluid exhibits diffused vorticity, in contrast to the
+irrotational behavior characterizing a superfluid. Both Raman-induced and
+Rashba spin-orbit couplings are considered. In the first case the moment of
+inertia takes the rigid value at the transition between the plane wave and the
+single minimum phase, while in the latter case the rigid value is achieved in
+the limit of isotropic Rashba coupling. A procedure to generate the rigid
+rotation of the fluid and to measure the moment of inertia is proposed. The
+quenching of the quantum of circulation $h/m$, caused by Raman induced
+spin-orbit coupling in a toroidal geometry, is also discussed.",1609.04694v2
+2015-12-23,Bose-Einstein condensate in an optical lattice with Raman-assisted two-dimensional spin-orbit coupling,"In a recent experiment by Wu {\textit et al.} (arXiv:1511.08170), a
+Raman-assisted two-dimensional spin-orbit coupling has been realized for a
+Bose-Einstein condensate in an optical lattice potential. In light of this
+exciting progress, we study in detail key properties of the system. As the
+Raman lasers inevitably couple atoms to high-lying bands, the behaviors of the
+system in both the single- and many-particle sectors are significantly
+affected. In particular, the high-band effects enhance the plane-wave phase and
+lead to the emergence of ""roton"" gaps at low Zeeman fields. Furthermore, we
+identify high-band-induced topological phase boundaries in both the
+single-particle and the quasi-particle spectra. We then derive an effective
+two-band model, which captures the high-band physics in the experimentally
+relevant regime. Our results not only offer valuable insights into the novel
+two-dimensional lattice spin-orbit coupling, but also provide a systematic
+formalism to model high-band effects in lattice systems with Raman-assisted
+spin-orbit couplings.",1512.07448v3
+2019-06-18,Non uniform superconductivity in wires with strong spin-orbit coupling,"We study theoretically the onset of nonuniform superconductivity in a
+one-dimensional single wire in presence of Zeeman (or exchange field) and
+spin-orbit coupling. Using the Green's function formalism, we show that the
+spin-orbit coupling stabilizes modulated superconductivity in a broad range of
+temperatures and Zeeman fields. We investigate the anisotropy of the
+temperature-Zeeman field phase diagram, which is related to the orientation of
+the Zeeman field. In particular, the inhomogeneous superconducting state
+disappears if this latter field is aligned or perpendicular to the wire
+direction. We identify two regimes corresponding to weak and strong spin-orbit
+coupling respectively. The wave-vector of the modulated phase is evaluated in
+both regimes. The results also pertain for quasi-1D superconductors made of
+weakly coupled 1D chains.",1906.07572v3
+2021-04-01,Critical temperature in the BCS-BEC crossover with spin-orbit coupling,"We review the study of the superfluid phase transition in a system of
+fermions whose interaction can be tuned continuously along the crossover from
+Bardeen-Cooper-Schrieffer (BCS) superconducting phase to a Bose-Einstein
+condensate (BEC), also in the presence of a spin-orbit coupling. Below a
+critical temperature the system is characterized by an order parameter.
+Generally a mean field approximation cannot reproduce the correct behavior of
+the critical temperature $T_c$ over the whole crossover. We analyze the crucial
+role of quantum fluctuations beyond the mean-field approach useful to find
+$T_c$ along the crossover in the presence of a spin-orbit coupling, within a
+path integral approach. A formal and detailed derivation for the set of
+equations useful to derive $T_c$ is performed in the presence of Rashba,
+Dresselhaus and Zeeman couplings. In particular in the case of only Rashba
+coupling, for which the spin-orbit effects are more relevant, the two-body
+bound state exists for any value of the interaction, namely in the full
+crossover. As a result the effective masses of the emerging bosonic excitations
+are finite also in the BCS regime.",2104.00570v1
+2024-02-12,Topological excitations in a spin-orbit coupled spin-1 Bose-Einstein condensate under sinusoidally varying magnetic fields,"We present a theoretical study of a spin-orbit coupled spin-1 Bose-Einstein
+condensate under the influence of sinusoidally varying magnetic fields. In the
+ground state of the ferromagnetic spin-1 condensate, we investigate topological
+excitations in the system arising due to the combined effect of Rashba
+spin-orbit coupling and an in-plane sinusoidally varying magnetic field. In
+this work, we offer a comparative study for various choices of magnetic fields
+in the $x\rm{-}y$ plane. For a fixed field strength, the spin-orbit coupled
+system sustains a rich variety of exotic vortex structures ranging from
+vortex-antivortex lattices to vortex clusters as we increase the coupling
+strength.",2402.08118v1
+2007-01-15,Hall Conductance of a Two-Dimensional Electron Gas with Spin-Orbit Coupling at the Presence of Lateral Periodic Potential,"We evaluate the distribution of Hall conductances in magnetic subbands of
+two-dimensional electron gas with Rashba spin-orbit (SO) coupling placed in a
+periodic potential and perpendicular magnetic field. In this semiconductor
+structure the spin-orbit coupling mixes the states of different magnetic
+subbands and changes the distribution of their Hall conductances in comparison
+with the case of spinless particles. The calculations were made for
+semiconductor structures with a weak ($AlGaAs/GaAs$) and relatively strong
+($GaAs/InGaAs$) SO and Zeeman interactions. The Hall conductances of fully
+occupied magnetic subbands depend on the system parameters and can be changed
+when neighboring subbands touch each other. It was shown that in the real
+semiconductor structures with relatively strong SO coupling the distribution of
+Hall conductance differs from the quantization law predicted by Thouless et
+al\cite{Thoul} for systems without spin-orbit coupling. In the case of weak SO
+interaction and relatively large lattice period the Hall conductance of
+magnetic subbands are the same as for spinless particles, but as the lattice
+period decreases and two neighboring subbands touch each other the distribution
+of Hall conductances is changed drastically.",0701316v1
+2011-12-13,Critical temperature of a Rashba spin-orbit coupled Bose gas in harmonic traps,"We investigate theoretically Bose-Einstein condensation of an ideal, trapped
+Bose gas in the presence of Rashba spin-orbit coupling. Analytic results for
+the critical temperature and condensate fraction are derived, based on a
+semi-classical approximation to the single-particle energy spectrum and density
+of states, and are compared with exact results obtained by explicitly summing
+discrete energy levels for small number of particles. We find a significant
+decrease of the critical temperature and of the condensate fraction due to a
+finite spin-orbit coupling. For large coupling strength and finite number of
+particles $N$, the critical temperature scales as $N^{2/5}$ and $N^{2/3}$ in
+three and two dimensions, respectively, contrasted to the predictions of
+$N^{1/3}$ and $N^{1/2}$ in the absence of spin-orbit coupling. Finite size
+corrections in three dimensions are also discussed.",1112.2799v2
+2013-02-04,Many-body \textit{T}-matrix theory of a strongly interacting spin-orbit coupled Fermi gas: Momentum-resolved radio-frequency spectroscopy and fermionic pairing,"Interacting Fermi gases with spin-orbit coupling are responsible for many
+intriguing phenomena such as topological superfluids and Majorana fermions.
+Here we characterize theoretically fermionic pairing in a strongly interacting
+spin-orbit coupled Fermi gas, by using momentum-resolved radio-frequency
+spectroscopy. We develop a strong-coupling $T$-matrix theory and present a
+phase diagram near the unitary resonance limit. A smooth transition from atomic
+to molecular responses in the momentum-resolved spectroscopy is predicted, with
+a clear signature of anisotropic pairing at and below resonance. Our prediction
+with many-body pairing can be directly tested in a spin-orbit coupled Fermi gas
+of $^{40}$K or $^{6}$Li atoms near broad Feshbach resonances.",1302.0559v2
+2013-10-14,Fulde-Ferrell pairing instability of a Rashba spin-orbit coupled Fermi gas,"We theoretically analyze the pairing instability of a three-dimensional
+ultracold atomic Fermi gas towards a Fulde-Ferrell superfluid, in the presence
+of Rashba spin-orbit coupling and in-plane Zeeman field. We use the standard
+Thouless criterion for the onset of superfluidity, with which the effect of
+pair fluctuations is partially taken into account by approximately using a
+mean-field chemical potential at zero temperature. This gives rise to an
+improved prediction of the superfluid transition temperature beyond mean-field,
+particularly in the strong-coupling unitary limit. We also investigate the
+pairing instability with increasing Rashba spin-orbit coupling, along the
+crossover from a Bardeen-Cooper-Schrieffer superfluid to a Bose-Einstein
+condensate of Rashbons (i.e., the tightly bound state of two fermions formed by
+strong Rashba spin-orbit coupling",1310.3558v1
+2014-05-18,Ultracold Spin-Orbit Coupled Bose-Einstein Condensate in a Cavity: Route to Magnetic Phases Through Cavity Transmission,"We study the spin orbit coupled ultra cold Bose-Einstein condensate placed in
+a single mode Fabry-P\'erot cavity. The cavity introduces a quantum optical
+lattice potential which dynamically couples with the atomic degrees of freedom
+and realizes a generalized extended Bose Hubbard model whose zero temperature
+phase diagram can be controlled by tuning the cavity parameters. In the
+non-interacting limit, where the atom-atom interaction is set to zero, the
+resulting atomic dispersion shows interesting features such as bosonic analogue
+of Dirac points, cavity controlled Hofstadter spectrum which bears the hallmark
+of pseudo-spin-1/2 bosons in presence of Abelian and non-Abelian gauge field
+(the later due to spin-orbit coupling) in a cavity induced optical lattice
+potential. In the presence of atom-atom interaction, using a mapping to a
+generalized Bose Hubbard model of spin-orbit coupled bosons in classical
+optical lattice, we show that the system realizes a host of quantum magnetic
+phases whose magnetic order can be be detected from the cavity transmission.
+This provides an alternative approach for detecting quantum magnetism in ultra
+cold atoms. We discuss the effect of cavity induced optical bistability on this
+phases and their experimental consequences.",1405.4500v1
+2018-05-07,Quantum transport by spin-polarized edge states in graphene nanoribbons in the quantum spin Hall and quantum anomalous Hall regimes,"Using the non-equilibrium Green\noindent 's function method and the Keldysh
+formalism, we study the effects of spin-orbit interactions and time-reversal
+symmetry breaking exchange fields on non-equilibrium quantum transport in
+graphene armchair nanoribbons. We identify signatures of the quantum spin Hall
+(QSH) and the quantum anomalous Hall (QAH) phases in non-equilibrium edge
+transport by calculating the spin-resolved real space charge density and local
+currents at the nanoribbon edges. We find that the QSH phase, which is realized
+in a system with intrinsic spin-orbit coupling, is characterized by chiral
+counter-propagating local spin currents summing up to a net charge flow with
+opposite spin polarization at the edges. In the QAH phase, emerging in the
+presence of the Rashba spin-orbit coupling and a ferromagnetic exchange field,
+two chiral edge channels with opposite spins propagate in the same direction at
+each edge, generating an unpolarized charge current and a quantized Hall
+conductance $G = 2 e^2/h$. Increasing the intrinsic spin-orbit coupling causes
+a transition from the QAH to the QSH phase, evinced by characteristic changes
+in the non-equilibrium edge transport. In contrast, an antiferromagnetic
+exchange field can coexist with a QSH phase, but can never induce a QAH phase
+due to a symmetry that combines time-reversal and sublattice translational
+symmetry.",1805.02418v2
+2023-07-18,Effect of Spin Orbit Coupling in non-centrosymmetric half-Heusler alloys,"Spin-orbit coupled electronic structure of two representative non-polar
+half-Heusler alloys, namely 18 electron compound CoZrBi and 8 electron compound
+SiLiIn have been studied in details. An excursion through the Brillouin zone of
+these alloys from one high symmetry point to the other revealed rich local
+symmetry of the associated wave vectors resulting in non-trivial spin splitting
+of the bands and consequent diverse spin textures in the presence of spin-orbit
+coupling. Our first principles calculations supplemented with low energy
+$\boldsymbol{k.p}$ model Hamiltonian revealed the presence of linear
+Dresselhaus effect at the X point having $D_{2d}$ symmetry and Rashba effect
+with both linear and non-linear terms at the L point with $C_{3v}$ point group
+symmetry. Interestingly we have also identified non-trivial Zeeman spin
+splitting at the non-time reversal invariant W point and a pair of
+non-degenerate bands along the path $\Gamma$ to L displaying vanishing spin
+polarization due to the non-pseudo polar point group symmetry of the wave
+vectors. Further a comparative study of CoZrBi and SiLiIn suggest, in addition,
+to the local symmetry of the wave vectors, important role of the participating
+orbitals in deciding the nature and strength of spin splitting. Our
+calculations identify half-Heusler compounds with heavy elements displaying
+diverse spin textures may be ideal candidate for spin valleytronics where spin
+textures can be controlled by accessing different valleys around the high
+symmetry k-points.",2308.03760v2
+2019-03-14,Spin-Orbital-Intertwined Nematic State in FeSe,"The importance of the spin-orbit coupling (SOC) effect in Fe-based
+superconductors (FeSCs) has recently been under hot debate. Considering the
+Hund's coupling-induced electronic correlation, the understanding of the role
+of SOC in FeSCs is not trivial and is still elusive. Here, through a
+comprehensive study of 77Se and 57Fe nuclear magnetic resonance, a nontrivial
+SOC effect is revealed in the nematic state of FeSe. First, the
+orbital-dependent spin susceptibility, determined by the anisotropy of the 57Fe
+Knight shift, indicates a predominant role from the 3dxy orbital, which
+suggests the coexistence of local and itinerant spin degrees of freedom
+(d.o.f.) in the FeSe. Then, we reconfirm that the orbital reconstruction below
+the nematic transition temperature (Tnem ~ 90 K) happens not only on the 3dxz
+and 3dyz orbitals but also on the 3dxy orbital, which is beyond a trivial
+ferro-orbital order picture. Moreover, our results also indicate the
+development of a coherent coupling between the local and itinerant spin d.o.f.
+below Tnem, which is ascribed to a Hund's coupling-induced electronic crossover
+on the 3dxy orbital. Finally, due to a nontrivial SOC effect, sizable in-plane
+anisotropy of the spin susceptibility emerges in the nematic state, suggesting
+a spin-orbital-intertwined nematicity rather than simply spin- or
+orbital-driven nematicity}. The present work not only reveals a nontrivial SOC
+effect in the nematic state but also sheds light on the mechanism of nematic
+transition in FeSe.",1903.05798v2
+2017-08-15,Weak Localization and Antilocalization in Topological Materials with Impurity Spin-Orbit Interactions,"Topological materials have attracted considerable experimental and
+theoretical attention. They exhibit strong spin-orbit coupling both in the band
+structure (intrinsic) and in the impurity potentials (extrinsic), although the
+latter is often neglected. Here we discuss weak localization and
+antilocalization of massless Dirac fermions in topological insulators and
+massive Dirac fermions in Weyl semimetal thin films taking into account both
+intrinsic and extrinsic spin-orbit interactions. The physics is governed by the
+complex interplay of the chiral spin texture, quasiparticle mass, and scalar
+and spin-orbit scattering. We demonstrate that terms linear in the extrinsic
+spin-orbit scattering are generally present in the Bloch and momentum
+relaxation times in all topological materials, and the correction to the
+diffusion constant is linear in the strength of the extrinsic spin-orbit. In
+TIs, which have zero quasiparticle mass, the terms linear in the impurity
+spin-orbit coupling lead to an observable density dependence in the weak
+antilocalization correction. They produce substantial qualitative modifications
+to the magnetoconductivity, differing greatly from the conventional HLN formula
+traditionally used in experimental fits, which predicts a crossover from weak
+localization to antilocalization as a function of the extrinsic spin-orbit
+strength. In contrast, our analysis reveals that topological insulators always
+exhibit weak antilocalization. In WSM thin films having intermediate to large
+values of the quasiparticle mass extrinsic spin-orbit scattering strongly
+affects the boundary of the weak localization to antilocalization transition.
+We produce a complete phase diagram for this transition as a function of the
+mass and spin-orbit scattering strength. We discuss implications for
+experiments and provide a brief comparison with transition metal
+dichalcogenides.",1708.04930v1
+2015-02-27,Quantum phases of Bose-Einstein condensates with synthetic spin - orbital-angular-momentum coupling,"The experimental realization of emergent spin-orbit coupling through
+laser-induced Raman transitions in ultracold atoms paves the way for exploring
+novel superfluid physics and simulating exotic many-body phenomena. A recent
+proposal with the use of Laguerre-Gaussian lasers enables another fundamental
+type of coupling between spin and orbital angular momentum (SOAM) in ultracold
+atoms. We hereby study quantum phases of a realistic Bose-Einstein condensate
+(BEC) with this synthetic SOAM coupling in a disk-shaped geometry, respecting
+radial inhomogeneity of the Raman coupling. We find that the experimental
+system naturally resides in a strongly interacting regime in which the phase
+diagram significantly deviates from the single-particle picture. The interplay
+between SOAM coupling and interaction leads to rich structures in spin-resolved
+position and momentum distributions, including a stripe phase and various types
+of immiscible states. Our results would provide a guide for an experimental
+investigation of SOAM-coupled BECs.",1502.08052v2
+2008-11-08,Ballistic Spin Resonance,"The phenomenon of spin resonance has had far reaching influence since its
+discovery nearly 70 years ago. Electron spin resonance (ESR) driven by high
+frequency magnetic fields has informed our understanding of quantum mechanics,
+and finds application in fields as diverse as medicine and quantum information.
+Spin resonance induced by high frequency electric fields, known as electric
+dipole spin resonance (EDSR), has also been demonstrated recently. EDSR is
+mediated by spin-orbit interaction (SOI), which couples the spin degree of
+freedom and the momentum vector. Here, we report the observation of a novel
+spin resonance due to SOI that does not require external driving fields.
+Ballistic spin resonance (BSR) is driven by an internal spin-orbit field that
+acts upon electrons bouncing at gigaHertz frequencies in narrow channels of
+ultra-clean two-dimensional electron gas (2DEG). BSR is manifested in
+electrical measurements of pure spin currents as a strong suppression of spin
+relaxation length when the motion of electrons is in resonance with spin
+precession. These findings point the way to gate-tunable coherent spin
+rotations in ballistic nanostructures without external a.c. fields.",0811.1244v1
+2009-06-27,Steady-state spin densities and currents,"This article reviews steady-state spin densities and spin currents in
+materials with strong spin-orbit interactions. These phenomena are intimately
+related to spin precession due to spin-orbit coupling which has no equivalent
+in the steady state of charge distributions. The focus will be initially on
+effects originating from the band structure. In this case spin densities arise
+in an electric field because a component of each spin is conserved during
+precession. Spin currents arise because a component of each spin is continually
+precessing. These two phenomena are due to independent contributions to the
+steady-state density matrix, and scattering between the conserved and
+precessing spin distributions has important consequences for spin dynamics and
+spin-related effects in general. In the latter part of the article extrinsic
+effects such as skew scattering and side jump will be discussed, and it will be
+shown that these effects are also modified considerably by spin precession.
+Theoretical and experimental progress in all areas will be reviewed.",0906.5111v1
+2015-11-01,Reciprocal spin Hall effects in conductors with strong spin-orbit coupling: a review,"Spin Hall effect and its inverse provide essential means to convert charge to
+spin currents and vice versa, which serve as a primary function for spintronic
+phenomena such as the spin-torque ferromagnetic resonance and the spin Seebeck
+effect. These effects can oscillate magnetization or detect a thermally
+generated spin splitting in the chemical potential. Importantly this conversion
+process occurs via the spin-orbit interaction, and requires neither magnetic
+materials nor external magnetic fields. However, the spin Hall angle, i.e., the
+conversion yield between the charge and spin currents, depends severely on the
+experimental methods. Here we discuss the spin Hall angle and the spin
+diffusion length for a variety of materials including pure metals such as Pt
+and Ta, alloys and oxides determined by the spin absorption method in a lateral
+spin valve structure.",1511.00332v1
+2016-08-01,Coherent control over three-dimensional spin polarization for the spin-orbit coupled surface state of Bi$_2$Se$_3$,"Interference of spin-up and spin-down eigenstates depicts spin rotation of
+electrons, which is a fundamental concept of quantum mechanics and accepts
+technological challenges for the electrical spin manipulation. Here, we
+visualize this coherent spin physics through laser spin- and angle-resolved
+photoemission spectroscopy on a spin-orbital entangled surface-state of a
+topological insulator. It is unambiguously revealed that the linearly polarized
+laser can simultaneously excite spin-up and spin-down states and these quantum
+spin-basis are coherently superposed in photoelectron states. The superposition
+and the resulting spin rotation is arbitrary manipulated by the direction of
+the laser field. Moreover, the full observation of the spin rotation displays
+the phase of the quantum states. This presents a new facet of
+laser-photoemission technique for investigation of quantum spin physics opening
+new possibilities in the field of quantum spintronic applications.",1608.00479v3
+2018-09-17,Cross-shaped nanostructures for the study of spin to charge interconversions using spin-orbit coupling in non-magnetic materials,"Several spin-orbit effects allow performing spin to charge inter-conversion:
+the spin Hall effects, the Rashba effect, or the spin-momentum locking in
+topological insulators. Here we focus on how the detection of this
+inter-conversion can be made electrically, using three different cross-shaped
+nanostructures. We apply these measurement configurations to the case of the
+spin Hall effect in Pt, using CoFe electrodes to detect and inject spins. Both
+the direct and inverse spin Hall effect can be detected, with a spin Hall
+signal up to two order of magnitude higher than that of nonlocal measurements
+in metallic lateral spin valves, and with a much simpler fabrication protocol.
+We compare the respective signal amplitude of the three proposed geometries.
+Finally, comparison of the observed spin signals with finite element method
+calculations allows extracting the spin Hall angle and the spin diffusion
+length of Pt.",1809.06145v1
+2000-12-01,Magnetic and orbital ordering in cuprates and manganites,"The mechanisms of magnetic and orbital interactions due to double exchange
+(DE) and superexchange (SE) in transition metal oxides with degenerate e_g
+orbitals are presented. Specifically, we study the effective spin-orbital
+models derived for the d^9 ions as in KCuF_3, and for the d^4 ions as in
+LaMnO_3, for spins S=1/2 and S=2, respectively. Such models are characterized
+by three types of elementary excitations: spin waves, orbital waves, and
+spin-and-orbital waves. The SE interactions between Cu^{2+} (d^9) ions are
+inherently frustrated, which leads to a new mechanism of spin liquid which
+operates in three dimensions. The SE between Mn^{3+} (d^4) ions explains the
+A-type antiferromagnetic order in LaMnO_3 which coexists with the orbital
+order. In contrast, the ferromagnetic metallic phase and isotropic spin waves
+observed in doped manganites are explained by DE for degenerate e_g orbitals.
+It is shown that although a hole does not couple to spin excitations in
+ferromagnetic planes of LaMnO_3, the orbital excitations change the energy
+scale for the coherent hole propagation and cause a large redistribution of
+spectral weight. Finally, we point out some open problems in the present
+understanding of doped manganites.",0012013v1
+2019-04-26,"Spin, orbital and topological order in models of strongly correlated electrons","Different types of order are discussed in the context of strongly correlated
+transition metal oxides, involving pure compounds and $3d^{3}-4d^{4}$ and
+$3d^{2}-4d^{4}$ hybrids. Apart from standard, long-range spin and orbital
+orders we observe also exotic non-colinear spin patterns. Such patters can
+arise in presence of atomic spin-orbit coupling, which is a typical case, or
+due to spin-orbital entanglement at the bonds in its absence, being much less
+trivial. Within a special interacting one-dimensional spin-orbital model it is
+also possible to find a rigorous topological magnetic order in a gapless phase
+that goes beyond any classification tables of topological states of matter.
+This is an exotic example of a strongly correlated topological state. Finally,
+in the less correlated limit of $4d^{4}$ oxides, when orbital selective Mott
+localization can occur it is possible to stabilize by a $3d^{3}$ doping
+one-dimensional zigzag antiferromagnetic phases. Such phases have exhibit
+nonsymmorphic spatial symmetries that can lead to various topological
+phenomena, like single and mutliple Dirac points that can turn into nodal rings
+or multiple topological charges protecting single Dirac points. Finally, by
+creating a one-dimensional $3d^{2}-4d^{4}$ hybrid system that involves orbital
+pairing terms, it is possible to obtain an insulating spin-orbital model where
+the orbital part after fermionization maps to a non-uniform Kitaev model. Such
+model is proved to have topological phases in a wide parameter range even in
+the case of completely disordered $3d^{2}$ impurities. What more, it exhibits
+hidden Lorentz-like symmetries of the topological phase, that live in the
+parameters space of the model.",1904.11772v1
+2024-03-13,Synergy between Spin and Orbital Angular Momenta on a Möbius Strip,"Spin and orbital angular momenta are fundamental physical characteristics
+described by polarization and spatial degrees of freedom, respectively.
+Polarization is a feature of vector fields while spatial phase gradient
+determines the orbital angular momentum ubiquitous to any scalar field. Common
+wisdom treats these two degrees of freedom as distinct and independent
+principles to manipulate wave propagations. Here, we demonstrate their synergy.
+This is achieved by introducing two orthogonal $p$-orbitals as eigenbases,
+whose spatial modal features are exploited to generate orbital angular momenta
+and the associated orbital orientations provide means to simultaneously
+manipulate polarizations. Through periodic modulation and directional coupling,
+we realize a full cyclic evolution of the synchronized and synergized
+spin-orbital angular momenta. Remarkably, this evolution acquires a nontrivial
+geometric phase, leading to its representation on a M\""obius strip.
+Experimentally, an acoustic cavity array is designed, whose dipole resonances
+precisely mimic the $p$-orbitals. The acoustic waves, uniquely, see the
+pressure (scalar) field as a spatial feature and carry an intrinsic
+polarization defined by the velocity (vector) field, serving as an ideal
+platform to observe the synergy of spin and orbital angular momenta. Based on
+such a property, we further showcase a spin-orbital-Hall effect, highlighting
+the intricate locking of handedness, directionality, spin density and spatial
+mode profile. Our study unveils a fundamental connection between spin and
+orbital angular momenta, promising avenues for novel applications in
+information coding and high-capacity communications.",2403.08276v1
+2005-02-24,Spin polarization in a T-shape conductor induced by strong Rashba spin-orbit coupling,"We investigate numerically the spin polarization of the current in the
+presence of Rashba spin-orbit interaction in a T-shaped conductor proposed by
+A.A. Kiselev and K.W. Kim (Appl. Phys. Lett. {\bf 78} 775 (2001)). The
+recursive Green function method is used to calculate the three terminal spin
+dependent transmission probabilities. We focus on single-channel transport and
+show that the spin polarization becomes nearly 100 % with a conductance close
+to $e^{2}/h$ for sufficiently strong spin-orbit coupling. This is interpreted
+by the fact that electrons with opposite spin states are deflected into an
+opposite terminal by the spin dependent Lorentz force. The influence of the
+disorder on the predicted effect is also discussed. Cases for multi-channel
+transport are studied in connection with experiments.",0502572v2
+2008-10-19,Spin accumulation with spin-orbit interaction,"Spin accumulation is a crucial but imprecise concept in spintronics. In
+metal-based spintronics it is characterized in terms of semiclassical
+distribution functions. In semiconductors with a strong spin-orbit coupling the
+spin accumulation is interpreted as a superposition of coherent eigenstates.
+Both views can be reconciled by taking into account the electron-electron
+interaction: a sufficiently strong self-consistent exchange field reduces a
+spin accumulation to a chemical potential difference between the two spin bands
+even in the presence of spin-orbit coupling. We demonstrate the idea on a clean
+two-dimensional electron gas (2DEG) by showing how the exchange field protects
+a spin accumulation from dephasing and introduces an easy-plane anisotropy.",0810.3386v2
+2013-04-23,In-plane electric field effect on a spin-orbit coupled two-dimensional electron system in presence of magnetic field,"The effect of in-plane electric field on Landau level spacing, spin splitting
+energy, average spin polarization and average spin current in the bulk as well
+as at the edges of a two-dimensional electron system with Rashba spin-orbit
+coupling are presented here. The spin splitting energy for a particular
+magnetic field is found to be reduced by the external in-plane electric field.
+Unlike the case of a two-dimensional electron system without Rashba spin-orbit
+interaction, here the Landau level spacing is electric field dependent. This
+dependency becomes stronger at the edges in comparison to the bulk. The average
+spin polarization vector rotates anti-clockwise with the increase of electric
+field. The average spin current also gets influenced significantly by the
+application of the in-plane electric field.",1304.6253v2
+2013-10-07,Simulations of electric-dipole spin resonance for spin-orbit-coupled quantum dots in Overhauser field: fractional resonances and selection rules,"We consider spin rotations in single- and two-electron quantum dots that are
+driven by external AC electric field with two mechanisms that couple the
+electron spatial motion and the spin degree of freedom: the spin-orbit
+interaction and a random fluctuation of the Overhauser field due to nuclear
+spin bath. We perform a systematic numerical simulation of the driven system
+using a finite difference approach with an exact account taken for the
+electron-electron correlation. The simulation demonstrates that the electron
+oscillation in fluctuating nuclear field is translated into an effective
+magnetic field during the electron wave packet motion. The effective magnetic
+field drives the spin transitions according to the electric-dipole spin
+resonance mechanism. We find distinct signatures of selection rules for direct
+and higher-order transitions in terms of the spin-orbital symmetries of the
+wave functions. The selection rules are violated by the random fluctuation of
+the Overhauser field.",1310.1689v1
+2017-02-27,Current-induced spin polarization of a magnetized two-dimensional electron gas with Rashba spin-orbit interaction,"Current-induced spin polarization in a two-dimensional electron gas with
+Rashba spin-orbit interaction is considered theoretically in terms of the
+Matsubara Green functions. This formalism allows to describe temperature
+dependence of the induced spin polarization. The electron gas is assumed to be
+coupled to a magnetic substrate via exchange interaction. Analytical and
+numerical results on the temperature dependence of spin polarization have been
+obtained in the linear response regime. The spin polarization has been
+presented as a sum of two terms - one proportional to the relaxation time and
+the other related to the Berry phase corresponding to the electronic bands of
+the magnetized Rashba gas. The spin-orbit torque due to Rashba interaction is
+also discussed. Such a torque appears as a result of the exchange coupling
+between the non-equilibrium spin polarization and magnetic moment of the
+underlayer.",1702.08162v1
+2018-05-25,Quasiclassical theory of the spin-orbit magnetoresistance of three-dimensional Rashba metals,"The magnetoresistance of a three-dimensional Rashba material placed on top of
+a ferromagnetic insulator is theoretically investigated. In addition to the
+intrinsic Rashba spin-orbit interaction, we also consider extrinsic spin-orbit
+coupling via side-jump and skew scattering, and the Elliott-Yafet spin
+relaxation mechanism. The latter is anisotropic due to the mass anisotropy
+which reflects the noncentrosymmetric crystal structure of three-dimensional
+Rashba metals. A quasiclassical approach is employed to derive a set of coupled
+spin-diffusion equations, which are supplemented by boundary conditions that
+account for the spin-transfer torque at the interface of the bilayer. The
+magnetoresistance is fully determined by the current-induced spin polarization,
+i.e., it cannot in general be ascribed to a single (bulk) spin Hall angle. Our
+theoretical results reproduce several features of the experiments, at least
+qualitatively, and contain established phenomenological results in the relevant
+limiting cases. In particular, the anisotropy of the Elliott-Yafet spin
+relaxation mechanism plays a major role for the interpretation of the observed
+magnetoresistance.",1805.10245v1
+2017-07-11,Hole spin resonance and spin-orbit coupling in a silicon metal-oxide-semiconductor field-effect transistor,"We study hole spin resonance in a p-channel silicon metal-oxide-semiconductor
+field-effect transistor. In the sub-threshold region, the measured source-drain
+current reveals a double dot in the channel. The observed spin resonance
+spectra agree with a model of strongly coupled two-spin states in the presence
+of a spin-orbit-induced anti-crossing. Detailed spectroscopy at the
+anti-crossing shows a suppressed spin resonance signal due to
+spin-orbit-induced quantum state mixing. This suppression is also observed for
+multi-photon spin resonances. Our experimental observations agree with
+theoretical calculations.",1707.03106v1
+2019-03-29,Boundary conditions for spin and charge diffusion in the presence of interfacial spin-orbit coupling,"Breaking of the inversion symmetry at the interface between different
+materials may dramatically enhance spin-orbit interaction in the vicinity of
+the interface. We incorporate the effects of this interfacial spin-orbit
+coupling (ISOC) into the standard drift-diffusion theory by deriving
+generalized boundary conditions for diffusion equations. Our theoretical scheme
+is based on symmetry arguments, providing a natural classification and
+parametrization of all spin-charge and spin-spin conversion effects that occur
+due to ISOC at macroscopically isotropic interfaces between nonmagnetic
+materials. We illustrate our approach with specific examples of spin-charge
+conversion in hybrid structures. In particular, for a lateral metal-insulator
+structure we predict an ""ISOC-gating"" effect which can be used to detect spin
+currents in metallic films with weak bulk SOC.",1903.12592v1
+2010-04-03,Spin-selective Peierls transition in interacting one-dimensional conductors with spin-orbit interaction,"Interacting one-dimensional conductors with Rashba spin-orbit coupling are
+shown to exhibit a spin-selective Peierls-type transition into a mixed
+spin-charge-density-wave state. The transition leads to a gap for one-half of
+the conducting modes, which is strongly enhanced by electron-electron
+interactions. The other half of the modes remains in a strongly renormalized
+gapless state and conducts opposite spins in opposite directions, thus
+providing a perfect spin filter. The transition is driven by magnetic field and
+by spin-orbit interactions. As an example we show for semiconducting quantum
+wires and carbon nanotubes that the gap induced by weak magnetic fields or
+intrinsic spin-orbit interactions can get renormalized by 1 order of magnitude
+up to 10 - 30 K.",1004.0467v2
+2015-11-14,Spin current generation and magnetic response in carbon nanotubes by the twisting phonon mode,"We theoretically investigate spin current and magnetic response induced by
+the twisting phonon mode in carbon nanotubes via the spin-rotation coupling. An
+effective magnetic field due to the twisting mode induces both spin and orbital
+magnetizations. The induced spin and orbital magnetizations have both radial
+and axial components. We show that ac pure spin current is generated by the
+twisting phonon mode. The magnitude of the spin current and orbital
+magnetization for a (10,10) armchair nanotube is estimated as an example. We
+find that the ac pure spin current is detectable in magnitude when the
+frequency of the twisting mode is of the order of GHz, and that the orbital
+magnetization is found to be larger than the spin magnetization.",1511.04526v1
+2021-05-28,Spin-orbit interactions of transverse sound,"Spin-orbit interactions (SOIs) endow light with intriguing properties and
+applications such as photonic spin-Hall effects and spin-dependent vortex
+generations. However, it is counterintuitive that SOIs can exist for sound,
+which is a longitudinal wave that carries no intrinsic spin. Here, we
+theoretically and experimentally demonstrate that airborne sound can possess
+artificial transversality in an acoustic micropolar metamaterial and thus carry
+both spin and orbital angular momentum. This enables the realization of
+acoustic SOIs with rich phenomena beyond those in conventional acoustic
+systems. We demonstrate that acoustic activity of the metamaterial can induce
+coupling between the spin and linear crystal momentum k, which leads to
+negative refraction of the transverse sound. In addition, we show that the
+scattering of the transverse sound by a dipole particle can generate
+spin-dependent acoustic vortices via the geometric phase effect. The acoustic
+SOIs can provide new perspectives and functionalities for sound manipulations
+beyond the conventional scalar degree of freedom and may open an avenue to the
+development of spin-orbit acoustics.",2105.13558v1
+2002-12-06,Spin-Orbital Fluctuations and a large mass enhancement in LiV_2O_4,"We present a scenario that the multi-component fluctuations, especially those
+of the spin-orbital coupled modes, lead to the mass enhancement observed in
+LiV_2O_4. This phenomena is possible because all these modes are fluctuating
+due to the geometrical frustration. To illustrate this mechanism, the
+t_{2g}-orbital Hubbard model on the pyrochlore lattice is studied based on the
+random-phase approximation. We derive the generalized susceptibility in the
+SU(6) spin-orbital space and calculate the free energy by using a
+coupling-constant integration. The estimated specific heat coefficient is of
+the correct order of magnitude to explain the experiment.",0212149v1
+2005-12-13,Triplet pairing due to spin-orbit-assisted electron-phonon coupling,"We propose a microscopic mechanism for triplet pairing due to
+spin-orbit-assisted electron interaction with optical phonons in a crystal with
+a complex unit cell. Using two examples of electrons with symmetric Fermi
+surfaces in crystals with either a cubic or a layered square lattice, we show
+that spin-orbit-assisted electron-phonon coupling can, indeed, generate triplet
+pairing and that, in each case, it predetermines the tensor structure of a
+p-wave order parameter.",0512284v1
+2008-04-04,Coulomb-Enhanced Spin-Orbit Splitting: The Missing Piece in the Sr2RhO4 Puzzle,"The outstanding discrepancy between the measured and calculated
+(local-density approximation) Fermi surfaces in the well-characterized,
+paramagnetic Fermi liquid Sr2RhO4 is resolved by including the spin-orbit
+coupling and Coulomb repulsion. This results in an effective spin-orbit
+coupling constant enhanced 2.15 times over the bare value. A simple formalism
+allows discussion of other systems. For Sr2RhO4, the experimental specific-heat
+and mass enhancements are found to be 2.2.",0804.0762v2
+2008-11-07,Global nuclear structure aspects of tensor interaction,"A direct fit of the isoscalar spin-orbit and both isoscalar and isovector
+tensor coupling constants to the f5/2-f7/2 SO splittings in 40Ca, 56Ni, and
+48Ca requires: (i) a significant reduction of the standard isoscalar spin-orbit
+strength and (ii) strong attractive tensor coupling constants. The aim of this
+paper is to address the consequences of these strong attractive tensor and weak
+spin-orbit fields on total binding energies, two-neutron separation energies
+and nuclear deformability.",0811.1139v1
+2010-06-20,Semiclassical study of edge states and transverse electron focusing for strong spin-orbit coupling,"We studied the edge states and transverse electron focusing in the presence
+of spin-orbit interaction in a two dimensional electron gas. Assuming strong
+spin-orbit coupling we derived semiclassical quantization conditions to
+describe the dispersion of the edge states. Using the dispersion relation we
+then make predictions about certain properties of the focusing spectrum.
+Comparison of our analytical results with quantum mechanical transport
+calculations reveals that certain features of the focusing spectrum can be
+quite well understood in terms of the interference of the edge states while the
+explanation of other features seems to require a different approach.",1006.3953v2
+2010-08-12,Two exact properties of the perturbative expansion for the two-dimensional electron liquid with Rashba or Dresselhaus spin-orbit coupling,"We have identified two useful exact properties of the perturbative expansion
+for the case of a two-dimensional electron liquid with Rashba or Dresselhaus
+spin-orbit interaction and in the absence of magnetic field. The results allow
+us to draw interesting conclusions regarding the dependence of the exchange and
+correlation energy and of the quasiparticle properties on the strength of the
+spin-orbit coupling which are valid to all orders in the electron-electron
+interaction.",1008.2227v2
+2010-08-28,Resonant Inelastic X-ray Scattering on Spin-Orbit Coupled Insulating Iridates,"We determine how the elementary excitations of iridium-oxide materials, which
+are dominated by a strong relativistic spin-orbit coupling, appear in Resonant
+Inelastic X-ray Scattering (RIXS). Whereas the RIXS spectral weight at the L2
+x-ray edge vanishes, we find it to be strong at the L3-edge. Applying this to
+Sr2IrO4, we observe that RIXS, besides being sensitive to local doublet to
+quartet transitions, meticulously maps out the strongly dispersive delocalized
+excitations of the low-lying spin-orbit doublets.",1008.4862v1
+2013-05-10,Bound states of the spin-orbit coupled ultracold atom in a one-dimensional short-range potential,"We solve the bound state problem for the Hamiltonian with the spin-orbit and
+the Raman coupling included. The Hamiltonian is perturbed by a one-dimensional
+short-range potential V which describes the impurity scattering. In addition to
+the bound states obtained by considering weak solutions through the Fourier
+transform or by solving the eigenvalue equation on a suitable domain directly,
+it is shown that ordinary point-interaction representations of V lead to
+spin-orbit induced extra states.",1305.2316v1
+2013-10-24,Interplay of Kondo effect and strong spin-orbit coupling in multi-hole ultraclean carbon nanotubes,"We report on cotunneling spectroscopy magnetoconductance measurements of
+multi-hole ultraclean carbon nanotube quantum dots in the SU(4) Kondo regime
+with strong spin-orbit coupling. Successive shells show a gradual weakening of
+the Kondo effect with respect to the spin-orbital splittings, leading to an
+evolution from SU(4) to SU(2) symmetry with a suppressed conductance at half
+shell filling. The extracted energy level spectrum, overally consistent with
+negligible disorder in the nanotube, shows in the half filled case large
+renormalizations due to Coulombian effects.",1310.6530v1
+2014-12-01,Wigner-localized states in spin-orbit-coupled bosonic ultracold atoms with dipolar interaction,"We investigate the occurence of Wigner-localization phenomena in bosonic
+dipolar ultracold few-body systems with Rashba-like spin-orbit coupling. We
+show that the latter strongly enhances the effects of the dipole-dipole
+interactions, allowing to reach the Wigner-localized regime for strengths of
+the dipole moment much smaller than those necessary in the spin-orbit-free
+case.",1412.0505v1
+2014-12-09,Magnetism and electronic structure calculation of SmN,"The results of the electronic structure calculations performed on SmN by
+using the LDA+U method with and without including the spin-orbit coupling are
+presented. Within the LDA+U approach, a N(2$p$) band polarization of $\simeq
+0.3\ \mu_B$ is induced by Sm(4$f$)-N(2$p$) hybridization, and a half-metallic
+ground state is obtained. By including spin-orbit coupling the magnetic
+structure was shown to be antiferromagnetic of type II, with Sm spin and
+orbital moments nearly cancelling. This results into a semiconducting ground
+state, which is in agreement with experimental results.",1412.2966v1
+2015-07-22,Theoretical Study of Coulomb Correlations and Spin-Orbit Coupling in SrIrO3,"Given that energy scales associated with crystal field splitting, spin orbit
+coupling and coulomb correlations in iridates are comparable, hence leading to
+exotic properties, we investigate the physical properties of orthorhombic
+SrIrO3 using density functional theory. Our calculations, however, show that
+SrIrO 3 is a bad metal with no long range magnetic ordering, unlike its sister
+compounds Sr2IrO4 and Sr3Ir2O7. Moreover, despite having large band width, it
+appears conclusive that the larger resistivity in SrIrO 3 is due to spin orbit
+interactions. Besides, the effects of electron-electron correlations on its
+electronic structure and magnetic properties are also discussed.",1507.06058v1
+2016-03-11,Majorana fermions in charge carrier hole quantum wires,"Luttinger holes with strong Zeemann and spin-orbit interactions in a wire
+proximity-coupled to a superconductor is a promising system for observation of
+Majorana fermions. Earlier treatments of confined Luttinger holes in wires
+ignored a mutual transformation of heavy and light holes upon reflection from
+the heteroboundaries. This effect is crucial for Zeemann and spin-orbit
+coupling in the ground subband of holes with several spin-orbit terms linear in
+momentum. We discuss the criterion for realizing Majorana modes in charge
+carrier hole systems. GaAs or InSb hole wires shall exhibit stronger
+topological superconducting pairing compared to InSb electron systems in
+similar or weaker magnetic fields.",1603.03750v1
+2015-12-25,Effect of spin-orbit coupling on spectral and transport properties of tubular electron gas in InAs nanowires,"We constructed the Hamiltonian of spin-orbit splitting for carriers of a
+tubular electron gas in InAs nanowires. The spectral problem is solved using an
+exact numerical diagonalization. It is shown that the contribution of k-linear
+Dresselhaus-like spin-orbit (SO) coupling leads to renormalization of so-called
+SO-gaps and appearance of anticrossings in subband spectrum. These features can
+be detected in ballistic transport.",1512.08021v1
+2019-11-06,CPT-Violating Gravitational Orbital Perturbations,"A model for spontaneous symmetry breaking using a specific form of the
+bumblebee model is analyzed in the context of a Schwarzschild background
+metric. The resulting back reaction of the symmetry-breaking field on the
+metric is computed to second order. Consistency with conventional
+(pseudo)Riemannian geometry is demonstrated. This background field is coupled
+to fermions via a spin-dependent CPT-violating coupling term of a type commonly
+considered in the Standard-Model Extension. The perturbations of various
+orbital trajectories are discussed. Specifically, a spin-dependent orbital
+velocity is found as well as a spin-dependent precession rate.",1911.02542v1
+2020-02-13,Semi-realistic tight-binding model for spin-orbit torques,"We compute the spin-orbit torque in a transition metal heterostructure using
+Slater-Koster parameterization in the two-center tight-binding approximation
+and accounting for d-orbitals only. In this method, the spin-orbit coupling is
+modeled within Russel-Saunders scheme, which enables us to treat interfacial
+and bulk spin-orbit transport on equal footing. The two components of the
+spin-orbit torque, dissipative (damping-like) and reactive (field-like), are
+computed within Kubo linear response theory. By systematically studying their
+thickness and angular dependence, we were able to accurately characterize these
+components beyond the traditional ""inverse spin galvanic"" and ""spin Hall""
+effects. Whereas the conventional field-like torque is purely interfacial, we
+unambiguously demonstrate that the conventional the damping-like torque
+possesses both an interfacial and a bulk contribution. In addition, both
+field-like and damping-like torques display substantial angular dependence with
+strikingly different thickness behavior. While the planar contribution of the
+field-like torque decreases smoothly with the nonmagnetic metal thickness, the
+planar contribution of the damping-like torque increases dramatically with the
+nonmagnetic metal thickness. Finally, we investigate the self-torque exerted on
+the ferromagnet when the spin-orbit coupling of the nonmagnetic metal is turned
+off. Our results suggest that the spin accumulation that builds up inside the
+ferromagnet can be large enough to induce magnetic excitations.",2002.05533v1
+2020-10-19,The spin-spin model and the capture into the double synchronous resonance,"The aim of this article is to propose a model, that is a planar version of
+the Full Two-Body Problem, and discuss the existence and stability of a
+relevant periodic solution. Consider two homogeneous ellipsoids orbiting around
+each other in fixed coplanar Keplerian orbits. Moreover, their respective spin
+axes are assumed to be perpendicular to the orbital plane, that is also a
+common equatorial plane. The spin-spin model deals with the coupled rotational
+dynamics of both ellipsoids. For a non-zero orbital eccentricity, it has the
+structure of a non-autonomous system of coupled pendula. This model is a
+natural extension of the classical spin-orbit problem for two extended bodies.
+In addition, we consider dissipative tidal torques, that can trigger the
+capture of the system into spin-orbit and spin-spin resonances. In this paper
+we give some theoretical results for both the conservative model and the
+dissipative one. The conservative model has a Hamiltonian structure. We use
+properties of Hamiltonian systems to give some sufficient conditions in the
+space of parameters of the model, that guarantee existence, uniqueness and
+linear stability of an odd periodic solution. This solution represents a double
+synchronous resonance in the conservative regime. Such solution can be
+continued to the dissipative regime, where it becomes asymptotically stable. We
+see asymptotic stability as a dynamical mechanism for the capture into the
+double synchronous resonance. Finally we apply our results to several cases
+including the Pluto-Charon binary system and the Trojan binary asteroid 617
+Patroclus, target of the LUCY mission.",2010.09354v1
+2004-08-25,Measurement of gravitational spin-orbit coupling in a binary pulsar system,"In relativistic gravity, a spinning pulsar will precess as it orbits a
+compact companion star. We have measured the effect of such precession on the
+average shape and polarization of the radiation from PSR B1534+12. We have also
+detected, with limited precision, special-relativistic aberration of the
+revolving pulsar beam due to orbital motion. Our observations fix the system
+geometry, including the misalignment between the spin and orbital angular
+momenta, and yield a measurement of the precession timescale consistent with
+the predictions of General Relativity.",0408457v1
+2002-09-03,Generalized hole-particle transformations and spin reflection positivity in multi-orbital systems,"We propose a scheme combining spin reflection positivity and generalized
+hole-particle and orbital transformations to characterize the symmetry
+properties of the ground state for some correlated electron models on bipartite
+lattices. In particular, we rigorously determine at half-filling and for
+different regions of the parameter space the spin, orbital and $\eta$ pairing
+pseudospin of the ground state of generalized two-orbital Hubbard models which
+include the Hund's rule coupling.",0209062v1
+2011-11-02,Alternating spin-orbital order in tetragonal Sr2VO4,"Considering spin-orbit coupling, the tetragonal crystal-field, and all
+relevant superexchange processes including quantum interference, we derive
+expressions for the energy levels of the vanadium ions in tetragonal Sr2VO4.
+The used parameters of the model Hamiltonian allow to describe well the
+excitation spectra observed in neutron scattering and optical experiments at
+low temperatures. The free energy exhibits a minimum which corresponds to a
+novel alternating spin-orbital order with strong thermal fluctuation of the
+orbital mixing parameter.",1111.0668v1
+2020-04-03,PhD Thesis: Searching for an emergent SU(4) symmetry in real materials,"The enhancement of the spin-space symmetry from the usual $\mathrm{SU}(2)$ to
+$\mathrm{SU}(N)$ with $N>2$ is promising for finding nontrivial quantum spin
+liquids, but the realization of $\mathrm{SU}(N)$ spin systems in real materials
+is still challenging. Although there is a proposal in cold atomic systems, in
+magnetic materials with a spin-orbital degree of freedom it is difficult to
+achieve the $\mathrm{SU}(N)$ symmetry by fine tuning. Here we propose a new
+mechanism by which the $\mathrm{SU}(4)$ symmetry emerges in the strong
+spin-orbit coupling limit. In $d^1$ transition metal compounds with
+edge-sharing anion octahedra, the spin-orbit coupling gives rise to strongly
+bond-dependent and apparently $\mathrm{SU}(4)$-breaking hopping between the
+$J_\textrm{eff}=3/2$ quartets. However, in the honeycomb structure, a gauge
+transformation maps the system to an $\mathrm{SU}(4)$-symmetric Hubbard model,
+which means that the system has a hidden symmetry in spite of its large
+spin-orbit coupling. In the strong repulsion limit at quarter filling, as
+expected in $\alpha$-ZrCl$_3,$ the low-energy effective model is the
+$\mathrm{SU}(4)$ Heisenberg model on the honeycomb lattice, which cannot have a
+trivial gapped ground state and is expected to host a gapless spin-orbital
+liquid. In such quantum spin-orbital liquids, both the spin and orbital degrees
+of freedom become fractionalized and correlated together at low temperature due
+to the strong frustrated interactions between them. Similarly to spinons in
+pure quantum spin liquids, quantum spin-orbital liquids can host not only
+spinon excitations, but also fermionic ""orbitalon"" excitations at low
+temperature, which we have named here in distinction from orbitons in the
+symmetry-broken Jahn-Teller phases.",2004.01716v1
+2004-06-04,"Orbital Polarization, Surface Enhancement and Quantum Confinement in Nano-cluster Magnetism","Within a rather general tight-binding framework, we studied the magnetic
+properties of Ni$_{n}$ clusters with $n=9$ through 60. In addition to usual
+hopping, exchange, and spin-orbit coupling terms, our Hamiltonian also included
+orbital correlation and valence orbital shift of surface atoms. We show that
+orbital moment not only contributes appreciably to the total moment in this
+range of cluster size, but also dominates the oscillation of total moment with
+respect to the cluster size. Surface enhancement is found to occur not only for
+spin but, even stronger, also for orbital moment. The magnitude of this
+enhancement depends mainly on the coordination deficit of surface atoms, well
+described by a simple interpolation. For very small clusters ($n \leq 20$),
+quantum confinement of 4s electrons has drastic effects on 3$d$ electron
+occupation, and thus greatly influences both spin and orbital magnetic moments.
+With physically reasonable parameters to account for orbital correlation and
+surface valence orbital shift, our results are in good quantitative agreement
+with available experiments, evidencing the construction of a unified
+theoretical framework for nano-cluster magnetism.",0406114v1
+2019-05-09,Exotic Cooper pairing in multi-orbital models of Sr$_2$RuO$_4$,"The unconventional superconductivity in Sr$_2$RuO$_4$ continues to defy a
+unified interpretation. In this paper, we focus on some novel aspects of its
+superconducting pairing by exploiting the orbital degree of freedom in this
+material. The multi-orbital nature, combined with the symmetry of the orbitals
+involved, leads to a plethora of exotic Cooper pairings not accessible in
+single-orbital systems. Essential physics is illustrated first using a
+two-orbital model with $d_{xz}$- and $d_{yz}$-orbitals. We classify the gap
+functions according to the underlying lattice symmetries, analyze the effective
+theories of a few representative pairings, and make connections to
+Sr$_2$RuO$_4$ in the course. In particular, we show how spin-orbit coupling may
+entangle spin-triplet and spin-singlet pairings. For completeness, the
+classification is generalized to the three-orbital model involving the
+$d_{xy}$-orbital as well. The orbital-basis approach distinguishes from the
+itinerant-band description for Sr$_2$RuO$_4$, and hence offers an alternative
+perspective to investigate its enigmatic superconducting state.",1905.03523v4
+2022-11-30,Emergent Orbital Skyrmion Lattice in a Triangular Atom Array,"Multi-orbital optical lattices have been attracting rapidly growing research
+interests in the last several years, providing fascinating opportunities for
+orbital-based quantum simulations. Here, we consider bosonic atoms loaded in
+the degenerate $p$-orbital bands of a two-dimensional triangular optical
+lattice. This system is described by a multi-orbital Bose-Hubbard model. We
+find the confined atoms in this system develop spontaneous orbital
+polarization, which forms a chiral Skyrmion lattice pattern in a large regime
+of the phase diagram. This is in contrast to its spin analogue which largely
+requires spin-orbit couplings. The emergence of the Skyrmion lattice is
+confirmed in both bosonic dynamical mean-field theory (BDMFT) and exact
+diagonalization (ED) calculations. By analyzing the quantum tunneling induced
+orbital-exchange interaction in the strong interaction limit, we find the
+Skyrmion lattice state arises due to the interplay of $p$-orbital symmetry and
+the geometric frustration of the triangular lattice. We provide experimental
+consequences of the orbital Skyrmion state, that can be readily tested in cold
+atom experiments. Our study implies orbital-based quantum simulations could
+bring exotic scenarios unexpected from their spin analogue.",2212.00167v2
+2005-10-02,Orbital order and fluctuations in Mott insulators,"Basic mechanisms controlling orbital order and orbital fluctuations in
+transition metal oxides are discussed. The lattice driven classical orbital
+picture, e.g. like in manganites LaMnO$_3$, is contrasted to the quantum
+behavior of orbitals in frustrated superexchange models as realised in
+pseudocubic titanites ATiO$_3$ and vanadates AVO$_3$. In YVO$_3$, the lattice
+and superexchange effects strongly compete -- this explains the extreme
+sensitivity of magnetic states to temperature and doping. Lifting the $t_{2g}$
+orbital degeneracy by a relativistic spin-orbital coupling is considered on
+example of the layered cobaltates. We find that the spin-orbital mixing of
+low-energy states leads to unusual magnetic correlations in a triangular
+lattice of the CoO$_2$ parent compound. Finally, the magnetism of sodium-rich
+compounds Na$_{1-x}$CoO$_2$ is discussed in terms of a spin/orbital polaronic
+liquid.",0510025v2
+2008-01-29,Orbital order driven quantum criticality,"Charge, spin, and orbital degrees of freedom underlie the physics of
+transition metal compounds. Much work has revealed quantum critical points
+associated with spin and charge degrees of freedom in many of these systems.
+Here we illustrate that the simplest models that embody the orbital degrees of
+freedom - the two- and three-dimensional quantum orbital compass models -
+exhibit an exact quantum critical behavior on diluted square and cubic lattices
+(with a doping fraction of 1/4 and 1/2 respectively). This raises the
+possibility of quantum critical points triggered by the degradation of orbital
+order upon doping (or applying pressure to) such transition metal systems. We
+prove the existence of an orbital spin glass in several related systems in
+which the orbital couplings are made non-uniform. Moreover, a new orbital
+Larmor precession (i.e., a periodic change in the orbital state) is predicted
+when uniaxial pressure is applied.",0801.4391v2
+2005-07-07,Orbital and spin physics in LiNiO2 and NaNiO2,"We derive a spin-orbital Hamiltonian for a triangular lattice of e_g orbital
+degenerate (Ni^{3+}) transition metal ions interacting via 90 degree
+superexchange involving (O^{2-}) anions, taking into account the on-site
+Coulomb interactions on both the anions and the transition metal ions. The
+derived interactions in the spin-orbital model are strongly frustrated, with
+the strongest orbital interactions selecting different orbitals for pairs of Ni
+ions along the three different lattice directions. In the orbital ordered
+phase, favoured in mean field theory, the spin-orbital interaction can play an
+important role by breaking the U(1) symmetry generated by the much stronger
+orbital interaction and restoring the threefold symmetry of the lattice. As a
+result the effective magnetic exchange is non-uniform and includes both
+ferromagnetic and antiferromagnetic spin interactions. Since ferromagnetic
+interactions still dominate, this offers yet insufficient explanation for the
+absence of magnetic order and the low-temperature behaviour of the magnetic
+susceptibility of stoichiometric LiNiO_2. The scenario proposed to explain the
+observed difference in the physical properties of LiNiO_2 and NaNiO_2 includes
+small covalency of Ni-O-Li-O-Ni bonds inducing weaker interplane superexchange
+in LiNiO_2, insufficient to stabilize orbital long-range order in the presence
+of stronger intraplane competition between superexchange and Jahn-Teller
+coupling.",0507169v1
+2018-03-09,Spin exchange-induced spin-orbit coupling in a superuid mixture,"We investigate the ground-state properties of a dual-species spin-1/2
+Bose-Einstein condensate. One of the species is subjected to a pair of Raman
+laser beams that induces spin-orbit (SO) coupling, whereas the other species is
+not coupled to the Raman laser. In certain limits, analytical results can be
+obtained. It is clearly shown that, through the inter-species spin-exchange
+interaction, the second species also exhibits SO coupling. This mixture system
+displays a very rich phase diagram, with many of the phases not present in an
+SO coupled single-species condensate. Our work provides a new way of creating
+SO coupling in atomic quantum gases, and opens up a new avenue of research in
+SO coupled superfluid mixtures. From a practical point of view, the spin
+exchange-induced SO coupling may overcome the heating issue for certain atomic
+species when subjected to the Raman beams.",1803.03387v1
+2018-08-23,Spin field-effect transistor in a quantum spin-Hall device,"We discuss the transport properties of a quantum spin-Hall insulator with
+sizable Rashba spin-orbit coupling in a disk geometry. The presence of
+topologically protected helical edge states allows for the control and
+manipulation of spin polarized currents: when ferromagnetic leads are coupled
+to the quantum spin-Hall device, the ballistic conductance is modulated by the
+Rashba strength. Therefore, by tuning the Rashba interaction via an
+all-electric gating, it is possible to control the spin polarization of
+injected electrons.",1808.07818v1
+2003-04-11,Magnetotransport in Two-Dimensional Electron Systems with Spin-Orbit Interaction,"We present magnetotransport calculations for homogeneous two-dimensional
+electron systems including the Rashba spin-orbit interaction, which mixes the
+spin-eigenstates and leads to a modified fan-chart with crossing Landau levels.
+The quantum mechanical Kubo formula is evaluated by taking into account
+spin-conserving scatterers in an extension of the self-consistent Born
+approximation that considers the spin degree of freedom. The calculated
+conductivity exhibits besides the well-known beating in the Shubnikov-de Haas
+(SdH) oscillations a modulation which is due to a suppression of scattering
+away from the crossing points of Landau levels and does not show up in the
+density of states. This modulation, surviving even at elevated temperatures
+when the SdH oscillations are damped out, could serve to identify spin-orbit
+coupling in magnetotransport experiments. Our magnetotransport calculations are
+extended also to lateral superlattices and predictions are made with respect to
+1/B periodic oscillations in dependence on carrier density and strength of the
+spin-orbit coupling.",0304260v1
+2010-04-06,Giant Intrinsic Spin-Orbit Coupling in Bilayer Graphene,"The intrinsic spin-orbit coupling (ISOC) in bilayer graphene is investigated.
+We find that the largest ISOC between $\pi$ electrons origins from the
+following hopping processes: a $\pi$ electron hops to $\sigma$ orbits of the
+other layer and further to $\pi$ orbits with the opposite spin through the
+intra-atomic ISOC. The magnitude of this ISOC is about $0.46meV$, 100 times
+larger than that of the monolayer graphene. The Hamiltonians including this
+ISOC in both momentum and real spaces are derived. Due to this ISOC, the
+low-energy states around the Dirac point exhibit a special spin polarization,
+in which the electron spins are oppositely polarized in the upper and lower
+layers. This spin polarization state is robust, protected by the time-reversal
+symmetry. In addition, we provide a hybrid system to select a certain spin
+polarization state by an electric manipulation.",1004.0881v1
+2013-03-06,Spin-orbit effects in nanowire-based wurtzite semiconductor quantum dots,"We study the effect of the Dresselhaus spin-orbit interaction on the
+electronic states and spin relaxation rates of cylindrical quantum dots defined
+on quantum wires having wurtzite lattice structure. The linear and cubic
+contributions of the bulk Dresselhaus spin-orbit coupling are taken into
+account, along with the influence of a weak external magnetic field. The
+previously found analytic solution for the electronic states of cylindrical
+quantum dots with zincblende lattice structures with Rashba interaction is
+extended to the case of quantum dots with wurtzite lattices. For the electronic
+states in InAs dots, we determine the spin texture and the effective g-factor,
+which shows a scaling collapse when plotted as a function of an effective
+renormalized dot-size dependent spin-orbit coupling strength. The
+acoustic-phonon-induced spin relaxation rate is calculated and the transverse
+piezoelectric potential is shown to be the dominant one.",1303.1363v1
+2013-07-28,Origin of Rashba-splitting in the quantized subbands at Bi2Se3 surface,"We study the band structure of the $\text{Bi}_2\text{Se}_3$ topological
+insulator (111) surface using angle-resolved photoemission spectroscopy. We
+examine the situation where two sets of quantized subbands exhibiting different
+Rashba spin-splitting are created via bending of the conduction (CB) and the
+valence (VB) bands at the surface. While the CB subbands are strongly Rashba
+spin-split, the VB subbands do not exhibit clear spin-splitting. We find that
+CB and VB experience similar band bending magnitudes, which means, a
+spin-splitting discrepancy due to different surface potential gradients can be
+excluded. On the other hand, by comparing the experimental band structure to
+first principles LMTO band structure calculations, we find that the strongly
+spin-orbit coupled Bi 6$p$ orbitals dominate the orbital character of CB,
+whereas their admixture to VB is rather small. The spin-splitting discrepancy
+is, therefore, traced back to the difference in spin-orbit coupling between CB
+and VB in the respective subbands' regions.",1307.7384v2
+2015-09-15,Relaxation and coherent oscillations in the spin dynamics of II-VI diluted magnetic quantum wells,"We study theoretically the ultrafast spin dynamics of II-VI diluted magnetic
+quantum wells in the presence of spin-orbit interaction. We extend a recent
+study where it was shown that the spin-orbit interaction and the exchange sd
+coupling in bulk and quantum wells can compete resulting in qualitatively new
+dynamics when they act simultaneously. We concentrate on
+Hg$_{1-x-y}$Mn$_x$Cd$_y$Te quantum wells, which have a highly tunable Rashba
+spin-orbit coupling. Our calculations use a recently developed formalism which
+incorporates electronic correlations originating from the exchange
+$sd$-coupling. We find that the dependence of electronic spin oscillations on
+the excess energy changes qualitatively depending on whether or not the
+spin-orbit interaction dominates or is of comparable strength with the sd
+interaction.",1509.04588v1
+2016-02-12,Rashba splitting of Cooper pairs,"We investigate theoretically the properties of a weak link between two
+superconducting leads, which has the form of a non-superconducting nanowire
+with a strong Rashba spin-orbit coupling caused by an electric field. In the
+Coulomb blockade regime of single-electron tunneling, we find that such a weak
+link acts as a ""spin splitter"" of the spin states of Cooper pairs tunneling
+through the link, to an extent that depends on the direction of the electric
+field. We show that the Josephson current is sensitive to interference between
+the resulting two transmission channels, one where the spins of both members of
+a Cooper pair are preserved and one where they are both flipped. As a result,
+the current is a periodic function of the strength of the spin-orbit
+interaction and of the bending angle of the nanowire (when mechanically bent);
+an identical effect appears due to strain-induced spin-orbit coupling. In
+contrast, no spin-orbit induced interference effect can influence the current
+through a single weak link connecting two normal metals.",1602.04161v3
+2017-09-15,"Energy spectrum, the spin polarization, and the optical selection rules of the Kronig-Penney superlattice model with spin-orbit coupling","The Kronig-Penney model, an exactly solvable one-dimensional model of crystal
+in solid physics, shows how the allowed and forbidden bands are formed in
+solids. In this paper, we study this model in the presence of both strong
+spin-orbit coupling and the Zeeman field. We analytically obtain four
+transcendental equations that represent an implicit relation between the energy
+and the Bloch wavevector. Solving these four transcendental equations, we
+obtain the spin-orbital bands exactly. In addition to the usual band gap opened
+at the boundary of the Brillouin zone, a much larger spin-orbital band gap is
+also opened at some special sites inside the Brillouin zone. The $x$-component
+of the spin-polarization vector is an even function of the Bloch wavevector,
+while the $z$-component of the spin-polarization vector is an odd function of
+the Bloch wavevector. At the band edges, the optical transition rates between
+adjacent bands are nonzero.",1709.05039v2
+2017-09-17,Intrinsic spin-orbit coupling gap and the evidence of a topological state in graphene,"In 2005 Kane & Mele[C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 226801
+(2005)], predicted that at sufficiently low energy, graphene exhibits a
+topological state of matter with an energy gap generated by the atomic
+spin-orbit interaction. However, this intrinsic gap has not been measured to
+this date. In this letter, we exploit the chirality of the low energy states to
+resolve this gap. We probe the spin states experimentally, by employing low
+temperature microwave excitation in a resistively detected electron spin
+resonance on graphene. The structure of the topological bands is reflected in
+our transport experiments, where our numerical models allow us to identify the
+resonance signatures. We determine the intrinsic spin-orbit bulk gap to be
+exactly 42.2 {\mu}eV. Electron-spin resonance experiments can reveal the
+competition between the intrinsic spin-orbit coupling and classical Zeeman
+energy that arises at low magnetic fields and demonstrate that graphene remains
+to be a material with surprising properties.",1709.05705v2
+2019-11-05,Spin-orbit Interaction driven Topological Features in a Quantum Ring,"One-dimensional quantum rings with Rashba and Dresselhaus spin-orbit
+couplings are studied analytically and are in perfect agreement with the
+numerical results. The topological charge of the spin field defined by the
+winding number along the ring is also studied analytically and numerically in
+the presence of the spin-orbit interactions. We also demonstrate the cases
+where the one-dimensional model is invalid for a relatively large radius.
+However, the numerical results of the two-dimensional model always remain
+reliable. Just as many physical properties of the quantum rings are influenced
+by the Aharonov-Bohm effect, the topological charge is also found to vary
+periodically due to the step-like change of the angular momentum with an
+increase of the magnetic field. This is significantly different from the cases
+of quantum dots. We also study how the current is induced by the magnetic field
+and spin-orbit couplings, which is strong enough that it could to be detected.
+The magnetic induction lines induced by the spin field and the current are also
+analyzed which can be observed and could perhaps help identifying the
+topological features of the spin fields in a quantum ring.",1911.01613v1
+2020-10-25,Absence of significant spin current generation in Ti/FeCoB bilayers with strong interfacial spin-orbit coupling,"After one decade of the intensive theoretical and experimental explorations,
+whether interfacial spin-orbit coupling (ISOC) at metallic magnetic interfaces
+can effectively generate a spin current has remained in dispute. Here,
+utilizing the Ti/FeCoB bilayers that are unique for the negligible bulk spin
+Hall effect and the strong tunable ISOC, we establish that there is no
+significant charge-to-spin conversion at magnetic interfaces via spin-orbit
+filtering effect or Rashba-Edelstein(-like) effect even when the ISOC is
+stronger than that of a typical Pt/ferromagnet interface and can promote strong
+perpendicular magnetic anisotropy. We also find a minimal orbital Hall effect
+in 3d Ti.",2010.13137v2
+2024-02-22,Spin-dependent interactions in orbital-density-dependent functionals: non-collinear Koopmans spectral functionals,"The presence of spin-orbit coupling or non-collinear magnetic spin states can
+have dramatic effects on the ground-state and spectral properties of materials,
+in particular on the band structure. Here, we develop non-collinear
+Koopmans-compliant functionals based on Wannier functions and
+density-functional perturbation theory, targeting accurate spectral properties
+in the quasiparticle approximation. Our non-collinear Koopmans-compliant theory
+involves functionals of four-component orbitals densities, that can be obtained
+from the charge and spin-vector densities of Wannier functions. We validate our
+approach on three emblematic and diverse semiconductors where the effect of
+spin-orbit coupling goes from small to very large: the III-IV semiconductor
+GaAs, the transition-metal dichalcogenide WSe$_2$, and the cubic perovskite
+CsPbBr$_3$. The predicted band gaps are comparable in accuracy to
+state-of-the-art many-body perturbation theory and include spin-dependent
+interactions and screening effects that are missing in standard diagrammatic
+approaches based on the random phase approximation. While the inclusion of
+orbital- and spin-dependent interactions in many-body perturbation theory
+requires self-screening or vertex corrections, that emerges naturally in the
+Koopmans-functionals framework.",2402.14575v1
+2012-08-18,Maximum intrinsic spin-Hall conductivity in two-dimensional systems with k-linear spin-orbit interaction,"We analytically calculate the intrinsic spin-Hall conductivity (ISHC)
+($\sigma^z_{xy}$ and $\sigma^z_{yx}$) in a clean, two-dimensional system with
+generic k-linear spin-orbit interaction. The coefficients of the product of the
+momentum and spin components form a spin-orbit matrix $\widetilde{\beta}$. We
+find that the determinant of the spin-orbit matrix $\detbeta$ describes the
+effective coupling of the spin $s_z$ and orbital motion $L_z$. The decoupling
+of spin and orbital motion results in a sign change of the ISHC and the
+band-overlapping phenomenon. Furthermore, we show that the ISHC is in general
+unsymmetrical ($\sigma^z_{xy}\neq-\sigma^z_{yx}$), and it is governed by the
+asymmetric response function $\Deltabeta$, which is the difference in
+band-splitting along two directions: those of the applied electric field and
+the spin-Hall current. The obtained non-vanishing asymmetric response function
+also implies that the ISHC can be larger than $e/8\pi$, but has an upper bound
+value of $e/4\pi$. We will that the unsymmetrical properties of the ISHC can
+also be deduced from the manifestation of the Berry curvature at the nearly
+degenerate area. On the other hand, by investigating the equilibrium spin
+current, we find that $\detbeta$ determines the field strength of the SU(2)
+non-Abelian gauge field.",1208.3755v3
+2023-02-23,Photo-assisted spin transport in double quantum dots with spin-orbit interaction,"We investigate the effect of spin-orbit interaction on the intra- and
+interdot particle dynamics of a double quantum dot under ac electric fields.
+The former is modeled as an effective ac magnetic field that produces
+electric-dipole spin resonance transitions, while the latter is introduced via
+spin-flip tunneling amplitudes. We observe the appearance of non-trivial
+spin-polarized dark states, arising from an ac-induced interference between
+photo-assisted spin-conserving and spin-flip tunneling processes. These dark
+states can be employed to precisely measure the spin-orbit coupling in quantum
+dot systems. Furthermore, we show that the interplay between photo-assisted
+transitions and spin-flip tunneling allows the system to operate as a highly
+tunable spin filter. Finally, we investigate the operation of the system as a
+resonant flopping-mode qubit for arbitrary ac voltage amplitudes, allowing for
+high tunability and enhanced qubit control possibilities.",2302.12272v2
+2021-08-09,"Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO3)2 (M = Cu, Mn)","We study how spin and orbital effects influence the capability of promoting
+Dzyaloshinskii-Moriya (DM) interaction by studying the two magnetic polar
+materials, Cu(IO3)2 (S = 1/2 with orbital contribution) and Mn(IO3)2 (S = 5/2
+with quenched orbital magnetism) and connecting their electronic and magnetic
+properties with their structures. The chemically controlled low-temperature
+synthesis of these complexes resulted in pure polycrystalline samples,
+providing a viable pathway to prepare bulk forms of transition-metal io-dates.
+Rietveld refinements of the powder synchrotron X-ray diffraction data reveal
+that these materials exhibit different crystal structures but crystallize in
+the same polar and chiral P21 space group, giving rise to an electric
+polarization along the b-axis direction. The presence and absence of an evident
+phase transition to a possible topologically distinct state observed in
+Cu(IO3)2 and Mn(IO3)2, respectively, implies the important role of spin-orbit
+coupling. Neutron diffraction experiments reveal helpful insights into the
+magnetic ground state of these materials. While the long-wavelength
+incommensurability of Cu(IO3)2 is in harmony with orbital effects and
+anisotropic magnetic exchange, the commensurate stripe AFM ground state of
+Mn(IO3)2 is attributed to quenched orbital angular momentum and isotropic
+magnetic coupling. The work demonstrates connections between combined spin and
+orbital effects, magnetic coupling dimensionality and DM exchange, providing a
+worthwhile approach for tuning asymmetric interaction which promotes evolution
+of topologically distinct spin phases.",2108.04290v2
+2012-07-06,SU(3) Spin-Orbit Coupling in Systems of Ultracold Atoms,"Motivated by the recent experimental success in realizing synthetic
+spin-orbit coupling in ultracold atomic systems, we consider N-component atoms
+coupled to a non-Abelian SU(N) gauge field. More specifically, we focus on the
+case, referred to here as ""SU(3) spin-orbit-coupling,"" where the internal
+states of three-component atoms are coupled to their momenta via a matrix
+structure that involves the Gell-Mann matrices (in contrast to the Pauli
+matrices in conventional SU(2) spin-orbit-coupled systems). It is shown that
+the SU(3) spin-orbit-coupling gives rise to qualitatively different phenomena
+and in particular we find that even a homogeneous SU(3) field on a simple
+square lattice enables a topologically non-trivial state to exist, while such
+SU(2) systems always have trivial topology. In deriving this result, we first
+establish an exact equivalence between the Hofstadter model with a 1/N Abelian
+flux per plaquette and a homogeneous SU(N) non-Abelian model. The former is
+known to have a topological spectrum for N>2, which is thus inherited by the
+latter. It is explicitly verified by an exact calculation for N=3, where we
+develop and use a new algebraic method to calculate topological indices in the
+SU(3) case. Finally, we consider a strip geometry and establish the existence
+of three gapless edge states -- the hallmark feature of such an SU(3)
+topological insulator.",1207.1728v2
+2004-12-17,The low-energy electronic structure and the orbital magnetism in NiO,"The orbital and spin moment of the Ni2+ ion in NiO has been calculated within
+the quasi-atomic approach. The orbital moment of 0.46 mu_B amounts at 0 K, in
+the magnetically-ordered state, to about 20% of the total moment (2.45 mu_B).
+For this outcome, being in nice agreement with the recent experimental finding
+of the orbital moment, taking into account the intra-atomic spin-orbit coupling
+is indispensable.
+  PACS: 75.25.+z, 75.10.Dg
+  Keywords: Crystalline Electric Field, 3d oxides, magnetism, NiO",0412484v1
+2017-04-01,Anomalous Hall Effect and Spontaneous Orbital Magnetization in Antiferromagnetic Weyl Metal,"We study the anomalous Hall effect and orbital magnetization in chiral
+antiferromagnets, constructing a simple tight-binding model on a stacked Kagome
+lattice structure with spin-orbit coupling and the exchange interaction between
+the localized spins and itinerant electrons. It is shown that the ground state
+is an orbital ferromagnet with the easy-plane anisotropy. The relation between
+the orbital magnetization and the configuration of the Weyl points are
+discussed.",1704.00094v3
+2001-08-01,Order from disorder: Quantum spin gap in magnon spectra of LaTiO_3,"A theory of the anisotropic superexchange and low energy spin excitations in
+a Mott insulator with t_{2g} orbital degeneracy is presented. We observe that
+the spin-orbit coupling induces frustrating Ising-like anisotropy terms in the
+spin Hamiltonian, which invalidate noninteracting spin wave theory. The
+frustration of classical states is resolved by an order from disorder
+mechanism, which selects a particular direction of the staggered moment and
+generates a quantum spin gap. The theory explains well the observed magnon gaps
+in LaTiO_3. As a test case, a specific prediction is made on the splitting of
+magnon branches at certain momentum directions.",0108016v2
+2005-04-12,Spin precession in a fractional quantum Hall state with spin-orbit coupling,"Experimental attempts to realize spin-devices based on concepts derived from
+single-particle theoretical approaches have not been very successful yet. This
+raises the fundamental question of whether inter-electron interactions can be
+neglected in planar electron-based spintronics devices. We report on our
+results of a many-body approach to the spin configuration in a quantum Hall
+state in the presence of Bychkov-Rashba type spin-orbit interaction. While some
+properties of this system are found to be ideally suited for exploitation in
+spin devices, others might seem to limit its applicability. The latter can
+however be optimized for device performance.",0504310v1
+2006-11-28,Generation of dc spin current in a narrow channel with Rashba and Dresselhaus spin-orbit interaction,"We consider a finite range ac-biased front gate acting upon a quantum channel
+with Rashba and Dresselhaus spin-orbit interaction effects. The ac-biased gate,
+giving rise to a dynamical Rashba coupling, causes spin-resolved coherent
+resonant inelastic scattering. A pure dc spin current is subsequently generated
+without accompanying charge current. In the presence of Dresselhaus effect, the
+dc spin current is suppressed in the low kinetic energy regime but is assisted
+in the high kinetic energy regime.",0611703v1
+2011-05-17,Spin-current in generic hybrid structures due to interfacial spin-orbit scattering,"We demonstrate a general principle that hybrid structures of any sort
+inevitably will give rise to a pure spin-current flowing parallel to the
+interface region when a charge-current is injected. This stems from the broken
+mirror symmetry near the interface which gives rise to spin-orbit coupling that
+deflects incoming electrons in a spin-discriminating fashion. We establish a
+general analytical condition for the appearance of this effect, and calculate
+the transverse spin-current explicitly using two different models. In addition,
+we investigate how the process of Andreev-reflection influences this phenomenon
+in the scenario where one of the materials is superconducting.",1105.3484v1
+2011-06-19,Electronic charge and spin density distribution in a quantum ring with spin-orbit and Coulomb interactions,"Charge and spin density distributions are studied within a nano-ring
+structure endowed with Rashba and Dresselhaus spin orbit coupling (SOI). For a
+small number of interacting electrons, in the presence of an external magnetic
+field, the energy spectrum of the system is calculated through an exact
+numerical diagonalization procedure. The eigenstates thus determined are used
+to estimate the charge and spin densities around the ring. We find that when
+more than two electrons are considered, the charge-density deformations induced
+by SOI are dramatically flattened by the Coulomb repulsion, while the spin
+density ones are amplified.",1106.3697v1
+2015-09-14,Spin-dependent Klein tunneling in polariton graphene with photonic spin-orbit interaction,"We study Klein tunneling in polariton graphene. We show that the photonic
+spin-orbit coupling associated with the energy splitting between TE and TM
+photonic modes can be described as an emergent gauge field. It suppresses the
+Klein tunnelling in small energy range close to the Dirac points. Thanks to
+polariton spin-anisotropic interactions, polarized optical pumping allows to
+create potential barriers acting on a single polariton spin. We show that the
+resulting spin-dependent Klein tunneling can be used to create a perfectly
+transmitting polarization rotator operating at microscopic scale.",1509.04009v1
+2000-03-31,Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots,"We have studied spin-flip transitions between Zeeman sublevels in GaAs
+electron quantum dots. Several different mechanisms which originate from
+spin-orbit coupling are shown to be responsible for such processes.
+  It is shown that spin-lattice relaxation for the electron localized in a
+quantum dot is much less effective than for the free electron. The spin-flip
+rates due to several other mechanisms not related to the spin-orbit interaction
+are also estimated.",0003513v2
+2001-10-22,Anisotropic spin and charge transport in Rashba Hamiltonian,"We explore spin and charge transport phenomena in two dimensional electron
+gas in presence of Rashba spin-orbit coupling connected to two ideal
+Ferromagnetic leads. In particular we show through a combination of analytical
+and numerical calculation that the spin polarization which is transported
+depends on the Magnetization direction of ferromagnet even if the magnetization
+of both FM's are parallel.Conductance is also shown to be anisotropic. These
+anisotrpies present in spin and charge transport are a consequence of breaking
+of rotational invariance due to Rashba spin-orbit interaction and are present
+irrespective of the Hamiltonian considered being an effective mass Hamiltonian
+or tight binding model Hamiltonian.",0110440v1
+2002-11-08,Diffuse transport and spin accumulation in a Rashba two-dimensional electron gas,"The Rashba Hamiltonian describes the splitting of the conduction band as a
+result of spin-orbit coupling in the presence of an asymmetric confinement
+potential and is commonly used to model the electronic structure of confined
+narrow-gap semiconductors. Due to the mixing of spin states some care has to be
+exercised in the calculation of transport properties. We derive the diffusive
+conductance tensor for a disordered two-dimensional electron gas with
+spin-orbit interaction and show that the applied bias induces a spin
+accumulation, but that the electric current is not spin-polarized.",0211153v1
+2004-10-01,Spin interferometry with electrons in nanostructures: A road to spintronic devices,"The wave nature of electrons in semiconductor nanostructures results in
+spatial interference effects similar to those exhibited by coherent light. The
+presence of spin-orbit coupling renders interference in spin space and in real
+space interdependent, making it possible to manipulate the electron's spin
+state by addressing its orbital degree of freedom. This suggests the utility of
+electronic analogs of optical interferometers as blueprints for new spintronics
+devices. We demonstrate the usefulness of this concept using the Mach-Zehnder
+interferometer as an example. Its spin-dependent analog realizes a
+spin-controlled field-effect transistor without magnetic contacts and may be
+used as a quantum logical gate.",0410008v1
+2006-11-03,Spin transport in mesoscopic rings with inhomogeneous spin-orbit coupling,"We revisit the problem of electron transport through mesoscopic rings with
+spin-orbit (SO) interaction. In the well-known path-integral approach, the
+scattering states for a quasi-1D ring with quasi-1D leads can be expressed in
+terms of spinless electrons subject to a fictitious magnetic flux. We show that
+spin-dependent quantum-interference effects in small rings are strongest for
+spatially inhomogeneous SO interactions, in which case spin currents can be
+controlled by a small external magnetic field. Mesoscopic spin Hall effects in
+four-terminal rings can also be understood in terms of the fictitious magnetic
+flux.",0611086v2
+2007-01-23,Spin densities in parabolic quantum wires with Rashba spin-orbit interaction,"Using canonical transformations we diagonalize approximately the Hamiltonian
+of a gaussian wire with Rashba spin-orbit interaction. This proceedure allows
+us to obtain the energy dispersion relations and the wavefunctions with good
+accuracy, even in systems with relatively strong Rashba coupling. With these
+eigenstates one can calculate the non-equilibrium spin densities induced by
+applying bias voltages across the sample. We focus on the $z$-component of the
+spin density, which is related to the spin Hall effect.",0701564v1
+2008-05-08,Spin Hall effect in a two-dimensional electron gas in the presence of a magnetic field,"We study the spin Hall effect of a two-dimensional electron gas in the
+presence of a magnetic field and both the Rashba and Dresselhaus spin-orbit
+interactions. We show that the value of the spin Hall conductivity, which is
+finite only if the Zeeman spin splitting is taken into account, may be tuned by
+varying the ratio of the in-plane and out-of-plane components of the applied
+magnetic field. We identify the origin of this behavior with the different role
+played by the interplay of spin-orbit and Zeeman couplings for in-plane and
+out-of-plane magnetic field components.",0805.1155v1
+2009-12-17,Scalable Quantum Computing based on Spin Qubits in CNT QD,"We study experimentally demonstrated single-electron ${}^{12}$C CNT QD with
+significant spin-orbit interaction as a scalable quantum computer candidate.
+Both electron spin and orbital angular momentum can serve as a logical qubit
+for quantum processing. We introduce macroscopic quantum memory for the system
+in a form of injected either magnetic or spin carrying atomic ensemble into the
+nanotube. CNT provides with a stable atomic trap in finite temperature and with
+one-dimensional nuclear spin lattice in an external magnetic field. The
+electron is coupled to the atomic ensemble through either magnetic or hyperfine
+interaction. Easy electron and nuclear spin read-out procedure for this system
+is possible.",0912.3547v1
+2014-05-24,Spin measurements and control of cold atoms using spin-orbit fields,"We show that by switching on a spin-orbit interaction in a cold-atom system,
+experiencing a Zeeman-like coupling to an external field, e.g., in a
+Bose-Einstein condensate, one can simulate a quantum measurement on a
+precessing spin. Depending on the realization, the measurement can access both
+the ergodic and the Zeno regimes, while {the time dependence} of the spin's
+decoherence may vary from a Gaussian to an inverse fractional power law. Back
+action of the measurement forms time- and coordinate-dependent profiles of the
+atoms' density, resulting in its translation, spin-dependent fragmentation, and
+appearance of interference patterns.",1405.6302v1
+2016-05-28,Spin splitting of electron states in lattice-mismatched (110)-oriented quantum wells,"We show that for lattice-mismatched zinc-blende-type (110)-grown quantum
+wells a significant contribution to the zero-magnetic-field spin splitting of
+electron subbands comes from strain-induced spin-orbit coupling. Combining
+envelope function theory and atomistic tight-binding approach we calculate
+spin-orbit splitting constants for realistic quantum wells. It is found that
+the strain due to lattice mismatch in conventional GaAs/AlGaAs structures may
+noticeably modify the spin splitting while in InGaAs/GaAs structures it plays a
+major role and may even change the sign of the spin splitting constant.",1605.08942v1
+2010-08-24,Modeling of diffusion of injected electron spins in spin-orbit coupled microchannels,"We report on a theoretical study of spin dynamics of an ensemble of
+spin-polarized electrons injected in a diffusive microchannel with linear
+Rashba and Dresselhaus spin-orbit coupling. We explore the dependence of the
+spin-precession and spin-diffusion lengths on the strengths of spin-orbit
+interaction and external magnetic fields, microchannel width, and orientation.
+Our results are based on numerical Monte Carlo simulations and on approximate
+analytical formulas, both treating the spin dynamics quantum-mechanically. We
+conclude that spin-diffusion lengths comparable or larger than the
+precession-length occur i) in the vicinity of the persistent spin helix regime
+for arbitrary channel width, and ii) in channels of similar or smaller width
+than the precession length, independent of the ratio of Rashba and Dresselhaus
+fields. For similar strengths of the Rashba and Dresselhaus fields, the
+steady-state spin-density oscillates or remains constant along the channel for
+channels parallel to the in-plane diagonal crystal directions. An oscillatory
+spin-polarization pattern tilted by 45$^{\circ}$ with respect to the channel
+axis is predicted for channels along the main cubic crystal directions. For
+typical experimental system parameters, magnetic fields of the order of Tesla
+are required to affect the spin-diffusion and spin-precession lengths.",1008.4030v2
+2017-08-01,"Coupling between Charge, Lattice, Orbital, and Spin in a Charge Density Wave of 1$T$-TaS$_2$","Two-dimensional layered transition metal dichalcogenide (TMDC) materials
+often exhibit exotic quantum matter phases due to the delicate coupling and
+competitions between the charge, lattice, orbital, and spin degrees of freedom.
+Surprisingly, we here present, based on first-principles density-functional
+theory calculations, the incorporation of all such degrees of freedom in a
+charge density wave (CDW) of monolayer (ML) TMDC 1$T$-TaS$_2$. We reveal that
+the CDW formed via the electron-phonon coupling is significantly stabilized by
+the orbital hybridization. The resulting lattice distortion to the ""David-star""
+superstructure constituted of one cental, six nearest-neighbor, and six
+next-nearest-neighbor Ta atoms is accompanied by the formation of
+quasimolecular orbitals due to a strong hybridization of the Ta $t_{\rm 2g}$
+orbitals. Furthermore, the flat band of the quasimolecular orbital at the Fermi
+level has a spin splitting caused by an intramolecular exchange, yielding a
+full spin polarization with a band-gap opening. Our finding of the intricate
+charge-lattice-orbital-spin coupling in ML 1$T$-TaS$_2$ provides a framework
+for the exploration of various CDW phases observed in few-layer or bulk
+1$T$-TaS$_2$.",1708.00213v1
+2018-02-08,Spin-Orbital Excitations in Ca$_{2}$RuO$_4$ Revealed by Resonant Inelastic X-ray Scattering,"The strongly correlated insulator Ca$_{2}$RuO$_4$ is considered as a
+paradigmatic realization of both spin-orbital physics and a band-Mott
+insulating phase, characterized by orbitally selective coexistence of a band
+and a Mott gap. We present a high-resolution oxygen $K$-edge resonant inelastic
+X-ray scattering study of the antiferromagnetic Mott insulating state of
+Ca$_{2}$RuO$_4$. A set of low-energy ($\sim$80 and 400 meV) and high-energy
+($\sim$1.3 and 2.2 eV) excitations are reported that show strong incident light
+polarization dependence. Our results strongly support a spin-orbit coupled
+band-Mott scenario and explore in detail the nature of its exotic excitations.
+Guided by theoretical modelling, we interpret the low-energy excitations as a
+result of composite spin-orbital excitations. Their nature unveil the intricate
+interplay of crystal-field splitting and spin-orbit coupling in the band-Mott
+scenario. The high-energy excitations correspond to intra-atomic
+singlet-triplet transitions at an energy scale set by the Hund's coupling. Our
+findings give a unifying picture of the spin and orbital excitations in the
+band-Mott insulator Ca$_{2}$RuO$_4$.",1802.02909v1
+2019-01-03,Strain Healing of Spin-Orbit Coupling: A Cause for Enhanced Magnetic Moment in Epitaxial SrRuO3 Thin Films,"Enhanced magnetic moment and coercivity in SrRuO3 thin films are significant
+issues for advanced technological usages and hence are researched extensively
+in recent times. Most of the previous reports on thin films with enhanced
+magnetic moment attributed the high spin state for the enhancement. Our
+magnetization results show high magnetic moment of 3.3 Bohr-magnetron/Ru ion in
+the epitaxial thin films grown on LSAT substrate against 1.2 Bohr-magnetron/Ru
+ion observed in bulk compound. Contrary to the expectation the Ru ions are
+found to be in low spin state and the orbital moment is shown to be
+contributing significantly in the enhancement of magnetic moment. We employed
+x-ray absorption spectroscopy and resonant valance band spectroscopy to probe
+the spin state and orbital contributions in these films. The existence of
+strong spin-orbit coupling responsible for the de-quenching of the 4d orbitals
+is confirmed by the observation of the non-statistical large branching ratio at
+the Ru M2,3 absorption edges. The relaxation of orbital quenching by strain
+engineering provides a new tool for enhancing magnetic moment. Strain disorder
+is shown to be an efficient mean to control the spin-orbit coupling.",1901.00613v1
+2021-08-09,Spin-orbit effects in pentavalent Iridates: Models and materials,"Spin-orbit effects in heavy 5$d$ transition metal oxides, in particular,
+iridates, have received enormous current interest due to the prediction as well
+as the realization of a plethora of exotic and unconventional magnetic
+properties. While a bulk of these works are based on tetravalent iridates
+($d^5$), where the counter-intuitive insulating state of the rather extended
+5$d$ orbitals are explained by invoking strong spin-orbit coupling, the recent
+quest in iridate research has shifted to the other valencies of Ir, of which
+pentavalent iridates constitute a notable representative. In contrast to the
+tetravalent iridates, spin-orbit entangled electrons in $d^4$ systems are
+expected to be confined to the $J = 0$ singlet state without any resultant
+moment or magnetic response. However, it has been recently predicted that,
+magnetism in $d^4$ systems may occur via magnetic condensation of excitations
+across spin-orbit-coupled states. In reality, the magnetism in Ir$^{5+}$
+systems are often quite debatable both from theoretical as well as experimental
+point of view. Here we provide a comprehensive overview of the spin-orbit
+coupled $d^4$ model systems and its implications in the studied pentavalent
+iridates. In particular, we review here the current experimental and
+theoretical understanding of the double perovskite ($A_2B$YIrO$_6$, $A =$ Sr,
+Ba, $B =$Y, Sc, Gd), 6H-perovskite (Ba$_3M$Ir$_2$O$_9$, $M =$ Zn, Mg, Sr, Ca),
+post-perovskite (NaIrO$_3$), and Hexagonal (Sr$_3$MIrO$_6$) iridates, along
+with a number of open questions that require future investigation.",2108.04158v1
+2018-12-16,High-resolution photoemission on Sr2RuO4 reveals correlation-enhanced effective spin-orbit coupling and dominantly local self-energies,"We explore the interplay of electron-electron correlations and spin-orbit
+coupling in the model Fermi liquid Sr2RuO4 using laser-based angle-resolved
+photoemission spectroscopy. Our precise measurement of the Fermi surface
+confirms the importance of spin-orbit coupling in this material and reveals
+that its effective value is enhanced by a factor of about two, due to
+electronic correlations. The self-energies for the $\beta$ and $\gamma$ sheets
+are found to display significant angular dependence. By taking into account the
+multi-orbital composition of quasiparticle states, we determine self-energies
+associated with each orbital component directly from the experimental data.
+This analysis demonstrates that the perceived angular dependence does not imply
+momentum-dependent many-body effects, but arises from a substantial orbital
+mixing induced by spin-orbit coupling. A comparison to single-site dynamical
+mean-field theory further supports the notion of dominantly local orbital
+self-energies, and provides strong evidence for an electronic origin of the
+observed non-linear frequency dependence of the self-energies, leading to
+`kinks' in the quasiparticle dispersion of Sr2RuO4.",1812.06531v2
+2011-03-17,A spin-orbit coupled Bose-Einstein condensate,"Spin-orbit (SO) coupling -- the interaction between a quantum particle's spin
+and its momentum -- is ubiquitous in nature, from atoms to solids. In condensed
+matter systems, SO coupling is crucial for the spin-Hall effect and topological
+insulators, which are of extensive interest; it contributes to the electronic
+properties of materials such as GaAs, and is important for spintronic devices.
+Ultracold atoms, quantum many-body systems under precise experimental control,
+would seem to be an ideal platform to study these fascinating SO coupled
+systems. While an atom's intrinsic SO coupling affects its electronic
+structure, it does not lead to coupling between the spin and the center-of-mass
+motion of the atom. Here, we engineer SO coupling (with equal Rashba and
+Dresselhaus strengths) in a neutral atomic Bose-Einstein condensate by dressing
+two atomic spin states with a pair of lasers. Not only is this the first SO
+coupling realized in ultracold atomic gases, it is also the first ever for
+bosons. Furthermore, in the presence of the laser coupling, the interactions
+between the two dressed atomic spin states are modified, driving a quantum
+phase transition from a spatially spin-mixed state (lasers off) to a phase
+separated state (above a critical laser intensity). The location of this
+transition is in quantitative agreement with our theory. This SO coupling --
+equally applicable for bosons and fermions -- sets the stage to realize
+topological insulators in fermionic neutral atom systems.",1103.3522v1
+2019-06-15,Theory of giant skew scattering by spin cluster,"Skew scattering of electrons induced by a spin cluster is studied
+theoretically focusing on metals with localized magnetic moments. The
+scattering probability is calculated by a non-perturbative $T$ matrix method;
+this method is valid for arbitrary strength of electron-spin coupling. We show
+the scattering of electrons by a three-spin cluster produces a skew angle of
+order $0.1\pi$ rad when the electron-spin coupling is comparable to the
+bandwidth. This is one or two orders of magnitude larger than the usual skew
+angle by an impurity with spin-orbit interaction. Systematic analysis of the
+scattering probability of one-, two-, and three-spin clusters show that three
+spins are necessary for skew scattering. We also discuss the relation between
+anomalous/spin Hall effects and the spin chiralities; we find that the spin
+Hall effect requires three spins while it is related to the vector spin
+chirality defined by a pair of spins. The relevance of these results to the
+large extrinsic anomalous and spin Hall effects in noncentrosymmetric and/or
+frustrated magnets is also discussed.",1906.06501v1
+2014-10-23,Spin-orbiton and quantum criticality in FeSc2S4,"In FeSc2S4 spin-orbital exchange competes with strong spin-orbit coupling,
+suppressing long-range spin and orbital order and, hence, this material
+represents one of the rare examples of a spin-orbital liquid ground state.
+Moreover, it is close to a quantum-critical point separating the ordered and
+disordered regimes. Using THz and FIR spectroscopy we study low-lying
+excitations in FeSc2S4 and provide clear evidence for a spin-orbiton, an
+excitation of strongly entangled spins and orbitals. It becomes particularly
+well pronounced upon cooling, when advancing deep into the quantum-critical
+regime. Moreover, indications of an underlying structureless excitation
+continuum are found, a possible signature of quantum criticality.",1410.6459v2
+2023-09-13,Orbital magnetization senses topological phase transition in spin-orbit coupled $α$-$T_3$ system,"The $\alpha$-$T_3$ system undergoes a topological phase transition(TPT)
+between two distinct quantum spin-Hall phases across $\alpha=0.5$ when the
+spin-orbit interaction of Kane-Mele type is taken into consideration. As a
+hallmark of such a TPT, we find that the Berry curvature and the orbital
+magnetic moment change their respective signs across the TPT. The trails of the
+TPT found in another physical observable e.g. the orbital magnetization(OM) are
+understood in terms of valley and spin physics. The valley-resolved OM(VROM)
+and the spin-resolved OM(SROM) exhibit interesting characteristics related to
+the valley and the spin Chern number when the chemical potential is tuned in
+the forbidden gap(s) of the energy spectrum. In particular, we find that the
+slope of the VROM vs the chemical potential in the forbidden gap changes its
+sign abruptly across the TPT which is also consistent with the corresponding
+change in the valley Chern number. Moreover, the slope of the SROM demonstrates
+a sudden jump by one unit of $e/h$, (where $e$ is the electronic charge and $h$
+is the Planck's constant), across the TPT which is also in agreement with the
+corresponding change in the spin Chern number.",2309.07074v1
+2015-07-06,Zitterbewegung of a heavy hole in presence of spin-orbit interactions,"We study the $zitterbewegung$ of a heavy hole in presence of both cubic
+Rashba and cubic Dresselhaus spin-orbit interactions. On contrary to the
+electronic case, $zitterbewegung$ does not vanish for equal strength of Rashba
+and Dresselhaus spin-orbit interaction. This non-vanishing of $zitterbewegung$
+is associated with the Berry phase. Due to the presence of the spin-orbit
+coupling the spin associated with the heavy hole precesses about an effective
+magnetic field. This spin precession produces a transverse spin-orbit force
+which also generates an electric voltage associated with $zitterbewegung$. We
+have estimated the magnitude of this voltage for a possible experimental
+detection of $zitterbewegung$.",1507.01393v2
+2019-03-04,Spin-Phonon Relaxation in Molecular Qubits from First Principles Spin Dynamics,"The coupling between electronic spins and lattice vibrations is fundamental
+for driving relaxation in magnetic materials. The debate over the nature of
+spin-phonon coupling dates back to the 40's, but the role of spin-spin,
+spin-orbit and hyperfine interactions, has never been fully established. Here
+we present a comprehensive study of the spin dynamics of a crystal of
+Vanadyl-based molecular qubits by means of first-order perturbation theory and
+first-principles calculations. We quantitatively determine the role of the
+Zeeman, hyperfine and electronic spin dipolar interactions in the direct
+mechanism of spin relaxation. We show that, in a high magnetic field regime,
+the modulation of the Zeeman Hamiltonian by the intra-molecular components of
+the acoustic phonons dominates the relaxation mechanism. In low fields,
+hyperfine coupling takes over, with the role of spin-spin dipolar interaction
+remaining the less important for the spin relaxation.",1903.01424v1
+2008-12-30,Boltzmann approach to the spin Hall effect revisited and electric field modified collision integrals,"The intrinsic contribution to the spin Hall effect in a 2DEG with
+non-magnetic impurities is studied in a quantum Boltzmann approach. It is shown
+that if the steady state response is perturbative in the spin-orbit coupling
+parameter $\lambda$, then the precession term--vital for Dyakonov-Perel
+relaxation and the key to the spin Hall effect in previous similar Boltzmann
+studies--must be left out to first order in spin-orbit coupling. In such a case
+one would have that to lowest order in the parameters electric field,
+spin-orbit coupling, impurity strength and impurity concentration there is no
+intrinsic contribution to the spin Hall effect, not only for a Rashba coupling
+but for a general spin-orbit coupling. To cover all possible lowest order terms
+we consider also electric field induced corrections to the collision integral
+in the Keldysh formalism. However, these corrections turn out to be of second
+order in $\lambda$. For comparison we derive some familiar results in the case
+when the response is not assumed to be perturbative in $\lambda$. We also
+include a detailed discussion of why a relaxation time approximation of the
+collision integral fails. Finally we make a comment on pseudospin currents in
+bilayer graphene.",0812.4800v2
+2018-04-05,Tight-binding model and ab initio calculation of silicene with strong spin-orbit coupling in low-energy limit,"We carry out both the tight-binding model and the $ab\ initio$ to study the
+layered silicene, the spin, valley, sublattice degrees of freedom are taken
+into consider and the effects of electric field, magnetic field, and even the
+light in finite frequency together with its interesting optical propertice,
+which are all closely related to the spin-orbit coupling and Rashba coupling
+and lead to the tunable phase transitions (between the nontrivial topological
+phase which has nonzero Chern number or nonzero spin Chern number and the
+trivial phase). An exotic quantum anomalous Hall insulator phase are found
+which has nonzero spin Chern number and nonzero valley Chern number and as a
+giant-application-potential spintronic and valleytronics in the two-ternimate
+devices based on the monolayer silicene for the information transmission. In
+fact, the gap-out action can be understanded by analyse the Dirac mass as well
+as the Zeeman splitting or the external-field-induced symmetry-broken, and the
+changes of gap has a general nonmonotone-variation characteristic under both
+the effects of electron filed-induced Rashba-coupling $R_{2}(E_{\perp})$ and
+the electron field-induced band gap, and the band inversion related to the
+spin-orbit coupling which absorbs both the spin and orbital angular of momentum
+may happen during this process. The quantized Hall/longitudinal conductivity
+together with the optical conductivity are also explored, we see that even in
+the quantum spin Hall phase without any magnetic field, the two-terminate
+conductivity can be reduced to the value $e^{2}/h$ by controlling the helical
+edge model, and it can be further reduced to $e^{2}/2h$ by applying the
+magnetic field which similar to the graphene.",1804.01695v1
+2021-11-12,Spin-orbit coupling matrix elements from the explicitly connected expressions of the response functions within the coupled-cluster theory,"In this work we present a coupled cluster based approach to the computation
+of the spin orbit coupling matrix elements. The working expressions are derived
+from the quadratic response function with the coupled cluster parametrization,
+using the auxiliary excitation operator S. Systematic approximations are
+proposed with the CCSD and CC3 levels of theory. The new method is tested by
+computing lifetimes of several electronic states of Ca, Sr and Ba atoms, with
+Gaussian and Slater basis sets. The results are compared with available
+theoretical and experimental data.",2111.06802v1
+2022-11-11,Simulating Spin-Orbit Coupling With Quasidegenerate N-Electron Valence Perturbation Theory,"We present the first implementation of spin-orbit coupling effects in fully
+internally contracted second-order quasidegenerate N-electron valence
+perturbation theory (SO-QDNEVPT2). The SO-QDNEVPT2 approach enables the
+computations of ground- and excited-state energies and oscillator strengths
+combining the description of static electron correlation with an efficient
+treatment of dynamic correlation and spin-orbit coupling. In addition to
+SO-QDNEVPT2 with the full description of one- and two-body spin-orbit
+interactions at the level of two-component Breit-Pauli Hamiltonian, our
+implementation also features a simplified approach that takes advantage of
+spin-orbit mean-field approximation (SOMF-QDNEVPT2). The accuracy of these
+methods is tested for the group 14 and 16 hydrides, 3d and 4d transition metal
+ions, and two actinide dioxides (neptunyl and plutonyl dications). The
+zero-field splittings of group 14 and 16 molecules computed using SO-QDNEVPT2
+and SOMF-QDNEVPT2 are in a good agreement with the available experimental data.
+For the 3d transition metal ions, the SO-QDNEVPT2 method is significantly more
+accurate than SOMF-QDNEVPT2, while no substantial difference in the performance
+of two methods is observed for the 4d ions. Finally, we demonstrate that for
+the actinide dioxides the results of SO-QDNEVPT2 and SOMF-QDNEVPT2 are in a
+good agreement with the data from previous theoretical studies of these
+systems. Overall, our results demonstrate that SO-QDNEVPT2 and SOMF-QDNEVPT2
+are promising multireference methods for treating spin-orbit coupling with a
+relatively low computational cost.",2211.06466v3
+2009-11-03,Two-step stabilization of orbital order and the dynamical frustration of spin in the model charge-transfer insulator KCuF3,"We report a combined experimental and theoretical study of KCuF3, which
+offers - because of this material's relatively simple lattice structure and
+valence configuration (d9, i.e., one hole in the d-shell) - a particularly
+clear view of the essential role of the orbital degree of freedom in governing
+the dynamical coupling between the spin and lattice degrees of freedom. We
+present Raman and x-ray scattering evidence that the phase behaviour of KCuF3
+is dominated above the Neel temperature (T_N = 40 K) by coupled orbital/lattice
+fluctuations that are likely associated with rotations of the CuF6 octahedra,
+and we show that these orbital fluctuations are interrupted by a static
+structural distortion that occurs just above T_N. A detailed model of the
+orbital and magnetic phases of KCuF3 reveals that these orbital fluctuations -
+and the related frustration of in-plane spin-order-are associated with the
+presence of nearly degenerate low-energy spin-orbital states that are highly
+susceptible to thermal fluctuations over a wide range of temperatures. A
+striking implication of these results is that the ground state of KCuF3 at
+ambient pressure lies near a quantum critical point associated with an
+orbital/spin liquid phase that is obscured by emergent Neel ordering of the
+spins; this exotic liquid phase might be accessible via pressure studies.",0911.0619v1
+2019-09-30,Coherent spin mixing via spin-orbit coupling in Bose gases,"We study beyond-mean-field properties of interacting spin-1 Bose gases with
+synthetic Rashba-Dresselhaus spin-orbit coupling at low energies. We derive a
+many-body Hamiltonian following a tight-binding approximation in quasi-momentum
+space, where the effective spin dependence of the collisions that emerges from
+spin-orbit coupling leads to dominant correlated tunneling processes that
+couple the different bound states. We discuss the properties of the spectrum of
+the derived Hamiltonian and its experimental signatures. In a certain region of
+the parameter space, the system becomes integrable, and its dynamics becomes
+analogous to that of a spin-1 condensate with spin-dependent collisions.
+Remarkably, we find that such dynamics can be observed in existing experimental
+setups through quench experiments that are robust against magnetic
+fluctuations.",1909.13840v1
+2017-11-23,Chaos in two-dimensional Kepler problem with spin-orbit coupling,"We consider classical two-dimensional Kepler system with spin-orbit coupling
+and show that at a sufficiently strong coupling it demonstrates a chaotic
+behavior. The chaos emerges since the spin-orbit coupling reduces the number of
+the integrals of motion as compared to the number of the degrees of freedom.
+This reduction is manifested in the equations of motion as the emergence of the
+anomalous velocity determined by the spin orientation. By using analytical and
+numerical arguments, we demonstrate that the chaotic behavior, being driven by
+this anomalous term, is related to the system energy dependence on the initial
+spin orientation. We observe the critical dependence of the dynamics on the
+initial conditions, where system can enter and exit a stability domain by very
+small changes in the initial spin orientation. Thus, this system can
+demonstrate a reentrant order-from-disorder transition driven by very small
+variations in the initial conditions.",1711.08773v1
+2019-02-02,Bloch oscillations of spin-orbit-coupled cold atoms in an optical lattice and spin current generation,"We study the Bloch oscillation dynamics of a spin-orbit-coupled cold atomic
+gas trapped inside a one-dimensioanl optical lattice. The eigenspectra of the
+system is identified as two interpenetrating Wannier-Stark ladder. Based on
+that, we carefully analyzed the Bloch oscillation dynamics and found out that
+intraladder coupling between neighboring rungs of Wannier-Stark ladder give
+rise to ordinary Bloch oscillation while interladder coupling lead to small
+amplitude high frequency oscillation superimposed on it. Specifically
+spin-orbit interaction breaks Galilean invariance, which can be reflected by
+out-of-phase oscillation of the two spin components in the accelerated frame.
+The possibility of generating spin current in this system are also explored.",1902.00634v1
+2017-07-07,Protected pseudohelical edge states in proximity graphene ribbons and flakes,"We investigate topological properties of models that describe graphene on
+realistic substrates which induce proximity spin-orbit coupling in graphene. A
+$\mathbb{Z}_2$ phase diagram is calculated for the parameter space of
+(generally different) intrinsic spin-orbit coupling on the two graphene
+sublattices, in the presence of Rashba coupling. The most fascinating case is
+that of staggered intrinsic spin-orbit coupling which, despite being
+topologically trivial, $\mathbb{Z}_2 = 0$, does exhibit edge states protected
+against time-reversal scattering for zigzag ribbons as wide as micrometers. We
+call these states pseudohelical as their helicity is locked to the sublattice.
+The spin character and robustness of the pseudohelical modes is best exhibited
+on a finite flake, which shows that the edge states have zero $g$-factor, carry
+a finite spin current in the crossection of the flake, and exhibit spin-flip
+reflectionless tunneling at the armchair edges.",1707.02124v1
+2012-05-10,"Bose Hubbard Models with Synthetic Spin-Orbit Coupling: Mott Insulators, Spin Textures and Superfluidity","Motivated by the experimental realization of synthetic spin-orbit coupling
+for ultracold atoms, we investigate the phase diagram of the Bose Hubbard model
+in a non-abelian gauge field in two dimensions. Using a strong coupling
+expansion in the combined presence of spin-orbit coupling and tunable
+interactions, we find a variety of interesting magnetic Hamiltonians in the
+Mott insulator (MI), which support magnetic textures such as spin spirals and
+vortex and Skyrmion crystals. An inhomogeneous mean field treatment shows that
+the superfluid (SF) phases inherit these exotic magnetic orders from the MI and
+display, in addition, unusual modulated current patterns. We present a slave
+boson theory which gives insight into such intertwined spin-charge orders in
+the SF, and discuss signatures of these orders in Bragg scattering, in situ
+microscopy, and dynamic quench experiments.",1205.2319v1
+2021-03-16,Effect of spin-orbit coupling on the high harmonics from the topological Dirac semimetal Na3Bi,"In this work, we performed extensive first-principles simulations of
+high-harmonic generation in the topological Diract semimetal Na3Bi using a
+time-dependent density functional theory framework, focusing on the effect of
+spin-orbit coupling (SOC) on the harmonic response. We also derived a general
+analytical model describing the microscopic mechanism of strong-field dynamics
+in presence of spin-orbit coupling, starting from a locally U(1)xSU(2)
+gauge-invariant Hamiltonian. Our results reveal that SOC: (i) affects the
+strong-field ionization by modifying the bandstructure of Na3Bi, (ii) modifies
+the electron velocity, making each spin channel to react differently to the
+pump laser field, (iii) changes the emission timing of the emitted harmonics.
+Moreover, we show that the SOC affects the harmonic emission by directly
+coupling the charge current to the spin currents, paving the way to the
+high-harmonic spectroscopy of spin currents in solids.",2103.09322v1
+2021-06-13,Fragile topology in nodal-line semimetal superconductors,"We study the band topology of the superconducting nodal-line semimetal
+(SC-NLSM) protected by the inversion symmetry with and without the spin-orbital
+coupling. Without the spin-orbital coupling, both the $s$-wave SC-NLSM and the
+chiral $p$-wave SC-NLSM are topologically nontrivial and can be described by
+the nonzero winding number. Based on the Wilson loop method, we verify that
+they are both the fragile topological superconductors, namely, their nontrivial
+band topologies can be moved off by coupling to additional topologically
+trivial bands. The fragile topological phase persists in spinful system with
+the time-reversal symmetry when a spin-orbital coupling term is added. For the
+spinful system, both the $p$-wave SC-NLSM and the $s$-wave SC-NLSM are
+second-order fragile topological superconductors. We propose that the fragile
+topology in the SC-NLSM system depends strongly on the degeneracy of the
+Majorana zero modes and the parity of the superconducting gap function.
+Interestingly, in presence of a vortex line, the spinful $s$-wave SC-NLSM
+system hosts two pairs of stable Majorana zero modes in the vortex core.",2106.06928v2
+2013-07-12,Quasiparticle Berry curvature and Chern numbers in spin-orbit coupled bosonic Mott insulators,"We study the ground-state topology and quasiparticle properties in bosonic
+Mott insulators with two- dimensional spin-orbit couplings in cold atomic
+optical lattices. We show that the many-body Chern and spin-Chern number can be
+expressed as an integral of the quasihole Berry curvatures over the Brillouin
+zone. Using a strong-coupling perturbation theory, for an experimentally
+feasible spin-orbit coupling, we compute the Berry curvature and the spin Chern
+number and find that these quantities can be generated purely by interactions.
+We also compute the quasiparticle dispersions, spectral weights, and the
+quasimomentum space distribution of particle and spin density, which can be
+accessed in cold-atom experiments and used to deduce the Berry curvature and
+Chern numbers.",1307.3594v2
+2016-05-04,Orbit-spin coupling and the interannual variability of global-scale dust storm occurrence on Mars,"A new physical hypothesis predicts that a weak coupling of the orbital and
+rotational motions of extended bodies may give rise to a modulation of
+circulatory flows within their atmospheres. Driven cycles of intensification
+and relaxation of large-scale circulatory flows are predicted, with the phasing
+of these changes linked directly to the rate of change of the orbital angular
+momentum with respect to inertial frames. We test the hypothesis that
+global-scale dust storms (GDS) on Mars may occur when periods of circulatory
+intensification (associated with positive and negative extrema of the waveform)
+coincide with the southern summer dust storm season on Mars. The orbit-spin
+coupling hypothesis additionally predicts that the intervening transitional
+periods, which are characterized by the disappearance and subsequent sign
+change of this waveform, may be unfavorable for the occurrence of GDS, when
+they occur during the southern summer dust storm season. These hypotheses are
+confirmed through comparisons between calculated dynamical time series of the
+time rate of change of orbital angular momentum and historic observations. All
+of the nine known global-scale dust storms on Mars took place during Mars years
+when circulatory intensification during the dust storm season is predicted
+under the orbit-spin coupling hypothesis. No historic global-scale dust storms
+were recorded during transitional intervals. Orbit-spin coupling accelerations
+evidently contribute to the interannual variability of the Mars atmosphere.",1605.01452v1
+2005-07-22,The 5f localization/delocalization in square and hexagonal americium monolayers: A FP-LAPW electronic structure study,"The electronic and geometrical properties of bulk americium and square and
+hexagonal americium monolayers have been studied with the full-potential
+linearized augmented plane wave (FP-LAPW) method. The effects of several common
+approximations are examined: (1) non-spin polarization (NSP) vs. spin
+polarization (SP); (2) scalar-relativity (no spin-orbit coupling (NSO)) vs.
+full-relativity (i.e., with spin-orbit (SO) coupling included); (3)
+local-density approximation (LDA) vs. generalized-gradient approximation (GGA).
+Our results indicate that both spin polarization and spin orbit coupling play
+important roles in determining the geometrical and electronic properties of
+americium bulk and monolayers. A compression of both americium square and
+hexagonal monolayers compared to the americium bulk is also observed. In
+general, the LDA is found to underestimate the equilibrium lattice constant and
+give a larger total energy compared to the GGA calculations. While spin orbit
+coupling shows a similar effect on both square and hexagonal monolayer
+calculations regardless of the model, GGA versus LDA, an unusual spin
+polarization effect on both square and hexagonal monolayers is found in the LDA
+results as compared with the GGA results. The 5f delocalization transition of
+americium is employed to explain our observed unusual spin polarization effect.
+In addition, our results at the LDA level of theory indicate a possible 5f
+delocalization could happen in the americium surface within the same Am II (fcc
+crystal structure) phase, unlike the usually reported americium 5f
+delocalization which is associated with crystal structure change. The
+similarities and dissimilarities between the properties of an Am monolayer and
+a Pu monolayer are discussed in detail.",0507536v1
+2006-04-12,Description of spin transport and precession in spin-orbit coupling systems and a general equation of continuity,"By generalizing the usual current density to a matrix with respect to spin
+variables, a general equation of continuity satisfied by the density matrix and
+current density matrix has been derived. This equation holds in arbitrary
+spin-orbit coupling systems as long as its Hamiltonian can be expressed in
+terms of a power series in momentum. Thereby, the expressions of the current
+density matrix and a torque density matrix are obtained. The current density
+matrix completely describes both the usual current and spin current as well;
+while the torque density matrix describes the spin precession caused by a total
+effective magnetic field, which may include a realistic and an effective one
+due to the spin-orbit coupling. In contrast to the conventional definition of
+spin current, this expression contains an additional term if the Hamiltonian
+includes nonlinear spin-orbit couplings. Moreover, if the degree of the full
+Hamiltonian $\geq3$, then the particle current must also be modified in order
+to satisfy the local conservation law of number.",0604320v8
+2018-05-21,Odd-frequency superconducting pairing in junctions with Rashba spin-orbit coupling,"We consider normal-superconductor (NS) and
+superconductor-normal-superconductor (SNS) junctions based on one-dimensional
+nanowires with Rashba spin-orbit coupling and proximity-induced $s$-wave
+spin-singlet superconductivity and analytically demonstrate how both even- and
+odd-frequency and spin-singlet and -triplet superconducting pair correlations
+are always present. In particular, by using a fully quantum mechanical
+scattering approach, we show that Andreev reflection induces mixing of spatial
+parities at interfaces, thus being the unique process which generates
+odd-frequency pairing; on the other hand, both Andreev and normal reflections
+contribute to even-frequency pairing. We further find that locally neither
+odd-frequency nor spin-triplet correlations are induced, but only
+even-frequency spin-singlet pairing. In the superconducting regions of NS
+junctions, the interface-induced amplitudes decay into the bulk, with the
+odd-frequency components being generally much larger than the even-frequency
+components at low frequencies. The odd-frequency pairing also develops short
+and long-period oscillations due to the chemical potential and spin-orbit
+coupling, respectively, leading to a visible beating feature in their
+magnitudes. Moreover, we find that in short SNS junctions at $\pi$-phase
+difference and strong spin-orbit coupling, the odd-frequency spin-singlet and
+-triplet correlations strongly dominate with an alternating spatial pattern for
+a large range of sub-gap frequencies.",1805.07948v2
+2020-05-10,Controlling stable tunneling in a non-Hermitian spin-orbit coupled bosonic junction,"In this paper, we study how to apply a periodic driving field to control
+stable spin tunneling in a non-Hermitian spin-orbit coupled bosonic double-well
+system. By means of a high-frequency approximation, we obtain the analytical
+Floquet solutions and their associated quasienergies and thus construct the
+general non-Floquet solutions of the dissipative spin-orbit coupled bosonic
+system. Based on detailed analysis of the Floquet quasienergy spectrum, the
+profound effect of system parameters and the periodic driving field on the
+stability of spin-dependent tunneling is investigated analytically and
+numerically for both balanced and unbalanced gain-loss between two wells. Under
+balanced gain and loss, we find that the stable spin-flipping tunneling is
+preferentially suppressed with the increase of gain-loss strength. When the
+ratio of Zeeman field strength to periodic driving frequency $\Omega/\omega$ is
+even, there is a possibility that \emph{continuous} stable parameter regions
+will exist. When $\Omega/\omega$ is odd, nevertheless, only \emph{discrete}
+stable parameter regions are found. Under unbalanced gain and loss, whether
+$\Omega/\omega$ is even or odd, we can get parametric equilibrium conditions
+for the existence of stable spin tunneling. The results could be useful for the
+experiments of controlling stable spin transportation in a non-Hermitian
+spin-orbit coupled system.",2005.04627v2
+2024-03-05,Unraveling spin texture and spin-orbit coupling contributions in spin triplet superconductivity,"Over the past decade, it has been proposed theoretically and confirmed
+experimentally that long-range spin triplet (LRT) superconductivity can be
+generated in ferromagnet-superconductor hybrids either by the presence of spin
+textures (ST-LRT) or thanks to spin-orbit coupling (SOC-LRT). Nevertheless,
+there has been no theoretical or experimental investigation to date suggesting
+that both contributions could simultaneously exist within an experimental
+system. To disentangle these contributions, we present a comprehensive study of
+superconducting quasiparticle interference effects taking place inside a
+ferromagnetic layer interfacing a superconductor, through the investigation of
+above-gap conductance anomalies (CAs) related to MacMillan-Rowell resonances.
+The bias dependence of the CAs has been studied under a wide range of in-plane
+(IP) and out-of-plane (OOP) magnetic fields in two types of epitaxial,
+V/MgO/Fe-based ferromagnet-superconductor junctions with interfacial spin-orbit
+coupling. We observe an anisotropy of the CAs amplitude under small IP and OOP
+magnetic fields while remaining weakly affected by high fields, and implement
+micromagnetic simulations to help us distinguish between the ST-LRT and SOC-LRT
+contributions. Our findings suggest that further exploration of Fabry-P\'erot
+type interference effects in electron transport could yield valuable insights
+into the hybridization between superconductors and ferromagnets induced by
+spin-orbit coupling and spin textures.",2403.02819v2
+1999-04-24,Quantum melting of magnetic long-range order near orbital degeneracy. Classical phases and Gaussian fluctuations,"We study the effective spin-orbital model derived for the d9 ions in a
+three-dimensional perovskite lattice, as in KCuF_3, where at each site the
+doubly degenerate eg orbitals contain a single hole. The model describes the
+superexchange interactions that depend on the pattern of orbitals occupied. We
+present the ground state properties of this model, depending on the splitting
+between the eg orbitals E_z, and the Hund's rule coupling in the excited d8
+states, J_H. The classical phase diagram consists of six magnetic phases which
+all have different orbital ordering: two antiferromagnetic (AF) phases with
+G-AF order and either x2-y2 or 3z2-r2 orbitals occupied, two phases with mixed
+orbital (MO) patterns and A-AF order, and two other MO phases with either C-AF
+or G-AF order. All of them become degenerate at the multicritical point
+M=(E_z,J_H)=(0,0). Using a generalization of linear spin-wave theory we study
+both the transverse excitations which are spin-waves and
+spin-and-orbital-waves, as well as the longitudinal (orbital) excitations. The
+transverse modes couple to each other, and the spin-and-orbital-wave turns into
+a soft mode near the M point. Therefore, quantum corrections to the
+long-range-order parameter are drastically increased near the orbital
+degeneracy, and classical order is suppressed in a crossover regime between the
+G-AF and A-AF phases in the (E_z,J_H) plane. This behavior is reminiscent of
+that found in frustrated spin models, and we conclude that orbital degeneracy
+provides a new and physically realizable mechanism which stabilizes a spin
+liquid ground state due to inherent frustration of magnetic interactions. We
+also point out that such a disordered magnetic phase is likely to be realized
+in LiNiO_2.",9904355v1
+2023-06-21,Spin-orbit torques due to warped topological insulator surface states with an in-plane magnetization,"We investigate the extrinsic spin-orbit torque (SOT) on the surface of
+topological insulators (TIs), which are characterized by two-dimensional warped
+Dirac surface states, in the presence of an in-plane magnetization. The
+interplay between extrinsic spin-orbit scattering and the in-plane
+magnetization results in a net spin density leading to a SOT. Previous theory
+suggested that the SOT could only be generated by an out-of-plane magnetic
+field component, and any in-plane magnetic contribution could be gauged away.
+However, we demonstrate theoretically that with an in-plane magnetization, the
+SOT can be finite in TIs due to extrinsic spin-orbit scattering. In the case of
+a TI model with a linear dispersion relation, the skew scattering term is zero,
+and the extrinsic spin-orbit scattering influences the side-jump scattering,
+leading to a finite SOT in TIs. However, when considering the warping term,
+finite intrinsic and skew scattering terms will arise, in addition to
+modifications to other scattering terms. We further show that the SOT depends
+on the azimuthal angles of the magnetization and an external electric field. By
+adjusting the extrinsic spin-orbit strength, Fermi energy, magnetization
+strength and warping strength, the resulting SOTs can be maximized. These
+findings shed light on the interplay between spin-orbit coupling and
+magnetization in TIs, offering insights into the control and manipulation of
+spin currents in these systems.",2306.12557v1
+2011-01-20,"Mean-field Study of Charge, Spin, and Orbital Orderings in Triangular-lattice Compounds ANiO2 (A=Na, Li, Ag)","We present our theoretical results on the ground states in layered
+triangular-lattice compounds ANiO2 (A=Na, Li, Ag). To describe the interplay
+between charge, spin, orbital, and lattice degrees of freedom in these
+materials, we study a doubly-degenerate Hubbard model with electron-phonon
+couplings by the Hartree-Fock approximation combined with the adiabatic
+approximation. In a weakly-correlated region, we find a metallic state
+accompanied by \sqroot3x\sqroot3 charge ordering. On the other hand, we obtain
+an insulating phase with spin-ferro and orbital-ferro ordering in a wide range
+from intermediate to strong correlation. These phases share many
+characteristics with the low-temperature states of AgNiO2 and NaNiO2,
+respectively. The charge-ordered metallic phase is stabilized by a compromise
+between Coulomb repulsions and effective attractive interactions originating
+from the breathing-type electronphonon coupling as well as the Hund's-rule
+coupling. The spin-orbital-ordered insulating phase is stabilized by the
+cooperative effect of electron correlations and the Jahn-Teller coupling, while
+the Hund's-rule coupling also plays a role in the competition with other
+orbital-ordered phases. The results suggest a unified way of understanding a
+variety of low-temperature phases in ANiO2. We also discuss a keen competition
+among different spin-orbital-ordered phases in relation to a puzzling behavior
+observed in LiNiO2.",1101.3828v1
+2006-01-23,Quasiclassical approach to the spin-Hall effect in the two-dimensional electron gas,"We study the spin-charge coupled transport in a two-dimensional electron
+system using the method of quasiclassical ($\xi$-integrated) Green's functions.
+In particular we derive the Eilenberger equation in the presence of a generic
+spin-orbit field. The method allows us to study spin and charge transport from
+ballistic to diffusive regimes and continuity equations for spin and charge are
+automatically incorporated. In the clean limit we establish the connection
+between the spin-Hall conductivity and the Berry phase in momentum space. For
+finite systems we solve the Eilenberger equation numerically for the special
+case of the Rashba spin-orbit coupling and a two-terminal geometry. In
+particular, we calculate explicitly the spin-Hall induced spin polarization in
+the corners, predicted by Mishchenko et al. [13]. Furthermore we find universal
+spin currents in the short-time dynamics after switching on the voltage across
+the sample, and calculate the corresponding spin-Hall polarization at the
+edges. Where available, we find perfect agreement with analytical results.",0601525v1
+2009-06-08,Pure spin-current generated by reflection at a normal metal/2DEG interface,"The concept of a spin-current is a useful tool in understanding
+spin-transport in hybrid systems, but its very definition is problematic in
+systems where spin-orbit coupling effects are strong. In the absence of
+spin-dependent scattering, the spin-current remains well-defined. We here
+propose a method for generating pure spin-currents in a normal metal where the
+spin-current consequently does not suffer from the aforementioned problems
+pertaining to its very definition or spin-relaxation processes. More
+specifically, we show how an unpolarized incident charge-current can induce a
+pure transverse spin-current by means of scattering at a normal metal/2DEG
+interface. This occurs for both Rashba and Dresselhaus spin-orbit coupling. An
+experimental setup for observation of this effect is proposed.",0906.1581v2
+2011-10-01,Phase diagram of the strongly correlated Kane-Mele-Hubbard model,"We explore the phase diagram of the strongly correlated Hubbard model with
+intrinsic spin orbit coupling on the honeycomb lattice. We obtain the low
+energy effective model describing the spin degree of freedom. We study the
+resulting model within the Schwinger boson and Schwinger fermion approaches.
+The Schwinger boson approach gives the boundary between the spin liquid phase
+and the magnetically ordered phases, Neel order and incommensurate Neel order.
+We find that increasing the strength of the spin orbit coupling, narrows the
+width of the spin liquid region. The Schwinger fermion approach sheds further
+light on the nature of the spin liquid phase. We obtain three different
+candidates for the spin liquid phase within the mean field approximation which
+are gapless spin liquid, topological Mott insulator, and the chiral spin liquid
+phases. We argue that the gauge fluctuations and the instanton effect may
+suppress the first two spin liquids, while the chiral spin liquid is stable
+against gauge fluctuations due to its nontrivial topology.",1110.0116v2
+2015-08-03,Spin orbit coupling controlled spin pumping effect,"Effective spin mixing conductance (ESMC) across the nonmagnetic metal
+(NM)/ferromagnet interface, spin Hall conductivity (SHC) and spin diffusion
+length (SDL) in the NM layer govern the functionality and performance of pure
+spin current devices with spin pumping technique. We show that all three
+parameters can be tuned significantly by the spin orbit coupling (SOC) strength
+of the NM layer in systems consisting of ferromagnetic insulating Y3Fe5O12
+layer and metallic Pd1-xPtx layer. Surprisingly, the ESMC is observed to
+increase significantly with x changing from 0 to 1.0. The SHC in PdPt alloys,
+dominated by the intrinsic term, is enhanced notably with increasing x.
+Meanwhile, the SDL is found to decrease when Pd atoms are replaced by heavier
+Pt atoms, validating the SOC induced spin flip scattering model in polyvalent
+PdPt alloys. The capabilities of both spin current generation and spin charge
+conversion are largely heightened via the SOC. These findings highlight the
+multifold tuning effects of the SOC in developing the new generation of
+spintronic devices.",1508.00352v3
+2016-10-12,Microscopic derivation of magnon spin current in a topological insulator/ferromagnet heterostructure,"We investigate a spin-electricity conversion effect in a topological
+insulator/ferromagnet heterostructure. In the spin-momentum-locked surface
+state, an electric current generates nonequilibrium spin accumulation, which
+causes a spin-orbit torque that acts on the ferromagnet. When spins in the
+ferromagnet are completely parallel to the accumulated spin, this spin-orbit
+torque is zero. In the presence of spin excitations, however, a coupling
+between magnons and electrons enables us to obtain a nonvanishing torque. In
+this paper, we consider a model of the heterostructure in which a
+three-dimensional magnon gas is coupled with a two-dimensional massless Dirac
+electron system at the interface. We calculate the torque induced by an
+electric field, which can be interpreted as a magnon spin current, up to the
+lowest order of the electron-magnon interaction. We derive the expressions for
+high and low temperatures and estimate the order of magnitude of the induced
+spin current for realistic materials at room temperature.",1610.03636v3
+2018-04-27,Spin Connections for Nonrelativistic Electrons on Curves and Surfaces,"We propose a basic theory of nonrelativistic spinful electrons on curves and
+surfaces. In particular, we discuss the presence and effects of spin
+connections, which describe how spinors and vectors couple to the geometry of
+curves and surfaces. We derive explicit expressions of spin connections by
+performing simple dimensional reduction from the three-dimensional flat space.
+The spin connections act on electrons as spin-dependent magnetic fields, which
+have been known as `pseudomagnetic fields' in the context of, e.g., graphenes
+and Dirac/Weyl semimetals. We propose that these spin-dependent magnetic fields
+are present universally on curves and surfaces, acting on electrons regardless
+of the kinds of their spinorial degrees of freedom and their dispersion
+relations. We discuss that the curvature effects via spin connections will
+induce the spin Hall effect and induce the Dzyaloshinskii--Moriya interactions
+between magnetic moments on curved surfaces, without relying on the
+relativistic spin-orbit couplings. We also mention the importance of spin
+connections on orbital physics of electrons on curved geometry.",1804.10613v2
+2016-08-20,Enhancement of Rashba spin-orbit coupling by electron-electron interaction,"We studied how the electron-electron (e-e) interaction enhances the strength
+of the Rashba spin-orbit coupling (RSOC) and opens the possibility of
+generating a spin-polarized output current from an unpolarized electric current
+without any magnetic elements. In this regard, we proposed a novel design of a
+graphene-like junction based on the $e$-$e$ interaction and the $RSOC$. The
+results showed that the $e$-$e$ interaction with $RSOC$ opens a spin energy gap
+and extremely enhances the $RSOC$ in this spin energy gap. Interestingly, the
+junction produces a large spin-polarized current and could act as a
+high-efficiency spin filter device (nearly 100\% spin polarization) at room
+temperature even at low Rashba and e-e interaction strengths. However, with an
+appropriate design, we showed that RSOC could strongly weaken the
+spin-polarized current and the spin energy gap, which is solely produced by the
+$e$-$e$ interaction, but a high spin polarization persists in some energy
+ranges.",1608.05841v1
+2017-05-02,Reversible spin texture in ferroelectric HfO2,"Spin-orbit coupling effects occurring in non-centrosymmetric materials are
+known to be responsible for non-trivial spin configurations and a number of
+emergent physical phenomena. Ferroelectric materials may be especially
+interesting in this regard due to reversible spontaneous polarization making
+possible for a non-volatile electrical control of the spin degrees of freedom.
+Here, we explore a technologically relevant oxide material, HfO2, which has
+been shown to exhibit robust ferroelectricity in a non-centrosymmetric
+orthorhombic phase. Using theoretical modelling based on density-functional
+theory, we investigate the spin-dependent electronic structure of the
+ferroelectric HfO2 and demonstrate the appearance of chiral spin textures
+driven by spin-orbit coupling. We analyze these spin configurations in terms of
+the Rashba and Dresselhaus effects within the k.p Hamiltonian model and find
+that the Rashba-type spin texture dominates around the valence band maximum,
+while the Dresselhaus-type spin texture prevails around the conduction band
+minimum. The latter is characterized by a very large Dresselhaus constant
+{\alpha}D = 0.578 eV {\AA}, which allows using this material as a tunnel
+barrier to produce tunneling anomalous and spin Hall effects that are
+reversible by ferroelectric polarization.",1705.00768v1
+2021-05-06,Visualization of optical polarization transfer to photoelectron spin vector emitted from the spin-orbit coupled surface state,"Similar to light polarization that is selected by a superposition of optical
+basis, electron spin direction can be controlled through a superposition of
+spin basis. We investigate such a spin interference occurring in photoemission
+of the spin-orbit coupled surface state in Bi2Se3 by using spin- and
+angle-resolved photoemission spectroscopy combined with laser light source
+(laser-SARPES). Our laser-SARPES with three-dimensional spin detection and
+tunable laser polarization including elliptical and circular polarization
+enables us to directly visualize how the direction of the fully-polarized
+photoelectron spin changes according to the optical phase and orientation of
+the incident laser polarization. By this advantage of our laser-SARPES, we
+demonstrate that such optical information can be projected to the
+three-dimensional spin vector of the photoelectrons. Our results, therefore,
+present a novel spin-polarized electron source permitting us to optically
+control the pure spin state pointing to the arbitrary direction.",2105.02749v2
+2021-11-18,"Long-range, Non-local Switching of Spin Textures in a Frustrated Antiferromagnet","Antiferromagnetic spintronics is an emerging area of quantum technologies
+that leverage the coupling between spin and orbital degrees of freedom in
+exotic materials. Spin-orbit interactions allow spin or angular momentum to be
+injected via electrical stimuli to manipulate the spin texture of a material,
+enabling the storage of information and energy. In general, the physical
+process is intrinsically local: spin is carried by an electrical current,
+imparted into the magnetic system, and the spin texture then rotates. The
+collective excitations of complex spin textures have rarely been utilized in
+this context, even though they can in principle transport spin over much longer
+distances, using much lower power. In this study, we show that spin information
+can be transported and stored non-locally in the material Fe$_x$NbS$_2$. We
+propose that collective modes leverage the strong magnetoelastic coupling in
+the system to achieve this, revealing a novel way to store spin information in
+complex magnetic systems",2111.09882v2
+2022-10-08,Comprehensive Demonstration of Spin-Hall Hanle Effects in Epitaxial Pt Thin Films,"We demonstrate a nonlinear Hall effect due to the boundary spin accumulation
+in Pt films grown on Al2O3 substrates. This Hall effect and the previously
+demonstrated Hanle magnetoresistance provide a complete picture of the
+spin-precession control of the spin and charge transport at the boundary of a
+spin-orbit coupled material, which we refer to as spin-Hall Hanle effects
+(SHHE). We also show that the SHHE can be employed to measure the spin
+diffusion length, the spin-Hall angle, and the spin relaxation time of heavy
+metal without the need of magnetic interface or the input from other
+measurements. The comprehensive demonstration of SHHE in such a simple system
+suggests they may be ubiquitous and needs to be considered for unravelling the
+spin and charge transport in more complex thin film structures of spin-orbit
+coupled materials.",2210.03863v1
+2023-06-15,Universal spin superconducting diode effect from spin-orbit coupling,"We propose a universal spin superconducting diode effect (SDE) induced by
+spin-orbit coupling (SOC), where the critical spin supercurrents in opposite
+directions are unequal. By analysis from both the Ginzburg-Landau theory and
+energy band analysis, we show that the spin-$\uparrow \uparrow$ and
+spin-$\downarrow \downarrow$ Cooper pairs possess opposite phase gradients and
+opposite momenta from the SOC, which leads to the spin SDE. Two superconductors
+with SOC, a $p$-wave superconductor as a toy model and a practical
+superconducting nanowire, are numerically studied and they both exhibit spin
+SDE. In addition, our theory also provides a unified picture for both spin and
+charge SDEs. Besides, we propose spin-polarized detection and nonlocal spin
+transport, as mature experimental technologies, to confirm the spin SDE in
+superconducting nanowires.",2306.09113v1
+2023-10-27,Ultrafast switchable spin-orbit coupling for silicon spin qubits via spin valves,"Recent experimental breakthroughs, particularly for single-qubit and
+two-qubit gates exceeding the error correction threshold, highlight silicon
+spin qubits as leading candidates for fault-tolerant quantum computation. In
+the existing architecture, intrinsic or synthetic spin-orbit coupling (SOC) is
+critical in various aspects, including electrical control, addressability,
+scalability, etc. However, the high-fidelity SWAP operation and quantum state
+transfer (QST) between spin qubits, crucial for qubit-qubit connectivity,
+require the switchable nature of SOC which is rarely considered. Here, we
+propose a flexible architecture based on spin valves by electrically changing
+its magnetization orientation within sub-nanoseconds to generate ultrafast
+switchable SOC. Based on the switchable SOC architecture, both SWAP operation
+of neighbor spin qubits and resonant QST between distant spins can be realized
+with fidelity exceeding 99% while considering the realistic experimental
+parameters. Benefiting from the compatible processes with the modern
+semiconductor industry and experimental advances in spin valves and spin
+qubits, our results pave the way for future construction of silicon-based
+quantum chips.",2310.17993v1
+2009-07-17,Mott physics and band topology in materials with strong spin-orbit interaction,"Recent theory and experiment have revealed that strong spin-orbit coupling
+can have dramatic qualitative effects on the band structure of weakly
+interacting solids. Indeed, it leads to a distinct phase of matter, the
+topological band insulator. In this paper, we consider the combined effects of
+spin-orbit coupling and strong electron correlation, and show that the former
+has both quantitative and qualitative effects upon the correlation-driven Mott
+transition. As a specific example we take Ir-based pyrochlores, where the
+subsystem of Ir 5d electrons is known to undergo a Mott transition. At weak
+electron-electron interaction, we predict that Ir electrons are in a metallic
+phase at weak spin-orbit interaction, and in a topological band insulator phase
+at strong spin-orbit interaction. Very generally, we show that with increasing
+strength of the electron-electron interaction, the effective spin-orbit
+coupling is enhanced, increasing the domain of the topological band insulator.
+Furthermore, in our model, we argue that with increasing interactions, the
+topological band insulator is transformed into a ""topological Mott insulator""
+phase, which is characterized by gapless surface spin-only excitations. The
+full phase diagram also includes a narrow region of gapless Mott insulator with
+a spinon Fermi surface, and a magnetically ordered state at still larger
+electron-electron interaction.",0907.2962v1
+2016-04-18,Crossed responses of spin and orbital magnetism in topological insulators,"Crossed magnetic responses between spin and orbital angular momentum are
+studied in time-reversal symmetric topological insulators. Due to spin-orbit
+coupling in the quantum spin Hall systems and three-dimensional topological
+insulators, the magnetic susceptibility has crossed (intersectional) components
+between spin and orbital part of magnetism. In this study, the crossed
+susceptibility for the orbital magnetization is studied in two- and
+three-dimensional topological insulator models, in which an external magnetic
+field interacts with the electron spin by Zeeman coupling via distinct
+g-factors for conduction and valence energy bands. The crossed susceptibility
+in two-dimensional quantum spin Hall insulators shows a quantized signature of
+the $\mathbb{Z}_2$ topological phase in response to Zeeman coupling via an
+averaged g-factor, and the quantization persists even when
+$\sigma^z$-conservation of electrons is broken by a tilted magnetic field. The
+bulk orbital magnetization is interpreted by the persistent edge current
+attributed to the chiral anomaly at the (1+1)-dimensional boundary. In
+three-dimensional topological insulators, we found that the crossed
+susceptibility is proportional to the difference of g-factors of conduction and
+valence electrons, which is qualitatively different from the two-dimensional
+case. Steep changes of the crossed susceptibility in three dimensions at the
+phase transition points are explained by the surface Dirac fermion theory.
+Finally, dependence of the crossed susceptibility on g-factors in two- and
+three-dimensional cases is discussed from the viewpoint of time-reversal and
+particle-hole symmetries.",1604.04991v2
+2014-03-06,Spin-orbital Entangled Molecular $j_{\rm eff}$ States in Lacunar Spinel Compounds,"The entanglement of the spin and orbital degrees of freedom through the
+spin-orbit coupling has been actively studied in condensed matter physics. In
+several iridium-oxide systems, the spin-orbital entangled state, identified by
+the effective angular momentum $j_{\rm eff}$, can host novel quantum phases
+with the help of electron correlations. Here, we show that a series of lacunar
+spinel compounds, Ga$M_4X_8$ ($M$ = Nb, Mo, Ta, and W and $X$ = S, Se, and Te),
+gives rise to a $\textit{molecular}$ $j_{\rm eff}$ state as a new spin-orbital
+composite on which the low energy effective Hamiltonian is based. A wide range
+of electron correlations is accessible by tuning the bandwidth under external
+and/or chemical pressure, enabling us to investigate the interesting
+cooperation between spin-orbit coupling and electron correlations. As
+illustrative examples, a two-dimensional topological insulating phase and an
+anisotropic spin Hamiltonian are investigated in the weak and strong coupling
+regimes, respectively. Our finding can provide an ideal platform for exploring
+$j_{\rm eff}$ physics and the resulting emergent phenomena.",1403.1358v2
+2019-10-11,Coupled density-spin Bose-Einstein condensates dynamics and collapse in systems with quintic nonlinearity,"We investigate the effects of spin-orbit coupling and Zeeman splitting on the
+coupled density-spin dynamics and collapse of the Bose-Einstein condensate
+driven by the quintic self-attraction in the same- and cross-spin channels. The
+characteristic feature of the collapse is the decrease in the width as given by
+the participation ratio of the density rather than by the expectation values of
+the coordinate. Qualitative arguments and numerical simulations reveal the
+existence of a critical spin-orbit coupling strength which either prohibits or
+leads to the collapse, and its dependence on other parameters, such as the
+condensates norm, spin-dependent nonlinear coupling, and the Zeeman splitting.
+The entire nonlinear dynamics critically depend on the initial spin sate.",1910.05023v1
+2014-02-24,Photon assisted tunneling through three quantum dots with spin-orbit-coupling,"The effect of an ac electric field on quantum transport properties in a
+system of three quantum dots, two of which are connected in parallel while the
+third is coupled to one of the other two, is investigated theoretically. Based
+on the Keldysh nonequilibrium Green's function method, the spin-dependent
+current, occupation number and spin accumulation can be obtained in our model.
+An external magnetic flux, Rashba spin orbit coupling (SOC) and intradot
+Coulomb interactions are considered. The magnitude of the spin-dependent
+average current and the positions of the photon assisted tunneling (PAT) peaks
+can be accurately controlled and manipulated by simply varying the strength of
+the coupling and the frequency of the ac field. A particularly interesting
+result is the observation of a new kind of PAT peak and a multiple
+electron-photon pump effect that can generated and controlled by the coupling
+between the quantum dots. In addition, the spin occupation number and spin
+accumulation can be well controlled by the Rashba SOC and the magnetic flux.",1402.5711v1
+2015-10-13,Interacting spin-orbit-coupled spin-1 Bose-Einstein condensates,"The recent experimental realization of spin-orbit (SO) coupling for spin-1
+ultracold atoms opens an interesting avenue for exploring SO-coupling-related
+physics in large-spin systems, which is generally unattainable in electronic
+materials. In this paper, we study the effects of interactions between atoms on
+the ground states and collective excitations of SO-coupled spin-1 Bose-Einstein
+condensates (BECs) in the presence of a spin-tensor potential. We find that
+ferromagnetic interaction between atoms can induce a stripe phase exhibiting
+in-phase or out-of-phase modulating patterns between spin-tensor and
+zero-spin-component density waves. We characterize the phase transitions
+between different phases using the spin-tensor density as well as the
+collective dipole motion of the BEC. We show that there exists a double
+maxon-roton structure in the Bogoliubov-excitation spectrum, attributed to the
+three band minima of the SO-coupled spin-1 BEC.",1510.03787v3
+2014-10-31,Spin-orbit coupling in fluorinated graphene,"We report on theoretical investigations of the spin-orbit coupling effects in
+fluorinated graphene. First-principles density functional calculations are
+performed for the dense and dilute adatom coverage limits. The dense limit is
+represented by the single-side semifluorinated graphene, which is a metal with
+spin-orbit splittings of about 10 meV. To simulate the effects of a single
+adatom, we also calculate the electronic structure of a $10 \times 10$
+supercell, with one fluorine atom in the top position. Since this dilute limit
+is useful to study spin transport and spin relaxation, we also introduce a
+realistic effective hopping Hamiltonian, based on symmetry considerations,
+which describes the supercell bands around the Fermi level. We provide the
+Hamiltonian parameters which are best fits to the first-principles data. We
+demonstrate that, unlike for the case of hydrogen adatoms, fluorine's own
+spin-orbit coupling is the principal cause of the giant induced local
+spin-orbit coupling in graphene. The $sp^3$ hybridization induced transfer of
+spin-orbit coupling from graphene's $\sigma$ bonds, important for hydrogenated
+graphene, contributes much less. Furthermore, the magnitude of the induced
+spin-orbit coupling due to fluorine adatoms is about $1000$ times more than
+that of pristine graphene, and 10 times more than that of hydrogenated
+graphene. Also unlike hydrogen, the fluorine adatom is not a narrow resonant
+scatterer at the Dirac point. The resonant peak in the density of states of
+fluorinated graphene in the dilute limit lies 260 meV below the Dirac point.
+The peak is rather broad, about 300 meV, making the fluorine adatom only a
+weakly resonant scatterer.",1411.0016v2
+2003-02-06,Semiclassical theory of spin-orbit interaction in the extended phase space,"We consider the semiclassical theory in a joint phase space of spin and
+orbital degrees of freedom. The method is developed from the path integrals
+using the spin-coherent-state representation, and yields the trace formula for
+the density of states. We discuss special cases, such as weak and strong
+spin-orbit coupling, and relate the present theory to the earlier approaches.",0302011v2
+2023-12-05,Current induced magnetisation in metal without space-inversion symmetry,"Magneto-electric effect, that is an appearance of magnetisation induced by
+electric current is allowed by symmetry in metals with crystal structure
+without space inversion. The microscopic origin of this effect is spin-orbit
+coupling of electrons with a non-centrosymmetric crystal lattice lifting spin
+degeneracy of electron energy and mixing spin and orbital degrees of freedom.
+The presented calculation of magnetisation induced by current based on the
+application of kinetic equation for the matrix distribution function of
+electrons occupying the states in two bands split by the spin-orbit
+interaction.",2312.04592v2
+2004-03-08,Zeeman energy and anomalous spin splitting in lateral GaAs quantum dots,"The level splittings induced by a horizontal magnetic field in a parabolic
+two-dimensional quantum dot with spin-orbit interaction are obtained.
+Characteristic features induced by the spin-orbit coupling are the appearance
+of zero-field gaps as well as energy splittings that depend on the electronic
+state and the orientation of the magnetic field in the quantum-dot plane. It is
+suggested that these quantum-dot properties could be used to determine the
+Rashba and Dresselhaus spin-orbit intensities",0403202v1
+2004-10-27,Spin-orbit-driven coherent oscillations in a few-electron quantum dot,"We propose an experiment to observe coherent oscillations in a single quantum
+dot with the oscillations driven by spin-orbit interaction. This is achieved
+without spin-polarised leads, and relies on changing the strength of the
+spin-orbit coupling via an applied gate pulse. We derive an effective model of
+this system which is formally equivalent to the Jaynes-Cummings model of
+quantum optics. For parameters relevant to a InGaAs dot, we calculate a Rabi
+frequency of 2 GHz.",0410714v2
+2005-12-20,Ballistic transport in one-dimensional loops with Rashba and Dresselhaus spin-orbit coupling,"We discuss the combined effect of Rashba and Dresselhaus spin-orbit
+interactions in polygonal loops formed by quantum wires, when the electron are
+injected in a node and collected at the opposite one. The conditions that allow
+perfect localization are found. Furthermore, we investigate the suppression of
+the Al'tshuler--Aronov--Spivak oscillations that appear, in presence of a
+magnetic flux, when the electrons are injected and collected at the same node.
+Finally, we point out that a recent realization of a ballistic spin
+interferometer can be used to obtain a reliable estimate of the magnitude ratio
+of the two spin-orbit interactions.\bigskip",0512499v1
+2009-03-16,Extrinsic and intrinsic ratchet response of a quantum dissipative spin-orbit medium,"Traditionally the charge ratchet effect is considered as a consequence of the
+extrinsic spatial asymmetry engineered by external asymmetric periodic
+potentials. Here we demonstrate that electrically and magnetically driven
+dissipative systems with spin-orbit interactions represent an exception from
+this standard idea. The charge and spin ratchet currents appear just due to the
+coexistence of quantum dissipation with the intrinsic spatial asymmetry of the
+spin-orbit coupling. The extrinsic spatial asymmetry is inessential.",0903.2765v1
+2014-09-07,Quantum spin Hall effect in a two-orbital model on a honeycomb lattice,"The spin Hall effect is investigated in a two-orbital tight-binding model on
+a honeycomb lattice. We show that the model exhibits three
+topologically-different insulating phases at half filling, which are
+distinguished by different quantized values of the spin Hall conductivity. We
+analytically determine the phase boundaries, where the valence and conduction
+bands touch with each other with forming the Dirac nodes at the Fermi level.
+The results are discussed in terms of the effective antisymmetric spin-orbit
+coupling. The relation to the Kane-Mele model and implications for a
+magnetoelectric effect are also discussed.",1409.2142v1
+2019-03-08,Spin-perturbed orbits near black holes,"Inspirals of rotating stellar-mass compact objects into massive black holes
+are influenced by the spin-curvature coupling, which drives the compact body
+away from geodesic motion due to its rotation. I formulate the Hamilton-Jacobi
+equation for a spinning test body orbiting a Kerr black hole, solve it to
+linear order in spin, and use the perturbative solution to compute the
+fundamental frequencies of motion along the orbit. This result provides one of
+the necessary ingredients for waveform models for the upcoming space-based
+gravitational-wave detector LISA.",1903.03649v1
+2016-02-01,Facet-dependent giant spin orbit torque in single crystalline antiferromagnetic Ir-Mn / ferromagnetic permalloy bilayers,"There has been considerable interest in spin-orbit torques for the purpose of
+manipulating the magnetization of ferromagnetic (FM) films or nano-elements for
+spintronic technologies. Spin-orbit torques are derived from spin currents
+created from charge currents in materials with significant spin-orbit coupling
+that diffuse into an adjacent FM material. There have been intensive efforts to
+search for candidate materials that exhibit large spin Hall angles, i.e.
+efficient charge to spin current conversion. Here we report, using spin torque
+ferromagnetic resonance, the observation of a giant spin Hall angle of up to
+~0.35 in (100) oriented single crystalline antiferromagnetic (AF) IrMn3 thin
+films, coupled to ferromagnetic permalloy layers, and a spin Hall angle that is
+about three times smaller in (111) oriented films. For the (100) oriented
+samples we show that the magnitude of the spin Hall angle can be significantly
+changed by manipulating the populations of the various AF domains through field
+annealing. Using ab-initio calculations we show that the triangular AF
+structure of IrMn3 gives rise to a substantial intrinsic spin Hall conductivity
+that is three times larger for the (100) than for the (111) orientations,
+consistent with our experimental findings.",1602.00670v1
+2013-06-12,Atomic spin-orbit coupling synthesized with magnetic-field-gradient pulses,"We discuss a general scheme for creating atomic spin-orbit coupling (SOC)
+such as the Rashba or Dresselhaus types using magnetic-field-gradient pulses.
+In contrast to conventional schemes based on adiabatic center-of-mass motion
+with atomic internal states restricted to a dressed-state subspace, our scheme
+works for the complete subspace of a hyperfine-spin manifold by utilizing the
+coupling between the atomic magnetic moment and external magnetic fields. A
+spatially dependent pulsed magnetic field acts as an internal-state-dependent
+impulse, thereby coupling the atomic internal spin with its orbital
+center-of-mass motion, as in the Einstein-de Haas effect. This effective
+coupling can be dynamically manipulated to synthesize SOC of any type (Rashba,
+Dresselhaus, or any linear combination thereof). Our scheme can be realized
+with most experimental setups of ultracold atoms and is especially suited for
+atoms with zero nuclear spins.",1306.2829v1
+2021-07-13,Supersolid phase of a spin-orbit-coupled Bose-Einstein condensate: a perturbation approach,"The phase diagram of a Bose-Einstein condensate with Raman-induced spin-orbit
+coupling includes a stripe phase with supersolid features. In this work we
+develop a perturbation approach to study the ground state and the Bogoliubov
+modes of this phase, holding for small values of the Raman coupling. We obtain
+analytical predictions for the most relevant observables (including the
+periodicity of stripes, sound velocities, compressibility, and magnetic
+susceptibility) which are in excellent agreement with the exact (non
+perturbative) numerical results, obtained for significantly large values of the
+coupling. We further unveil the nature of the two gapless Bogoliubov modes in
+the long-wavelength limit. We find that the spin branch of the spectrum,
+corresponding in this limit to the dynamics of the relative phase between the
+two spin components, describes a translation of the fringes of the equilibrium
+density profile, thereby providing the crystal Goldstone mode typical of a
+supersolid configuration. Finally, using sum-rule arguments, we show that the
+superfluid density can be experimentally accessed by measuring the ratio of the
+sound velocities parallel and perpendicular to the direction of the spin-orbit
+coupling.",2107.06425v2
+2017-10-07,Coupled spin-charge dynamics in helical Fermi liquids beyond the random phase approximation,"We consider a helical system of fermions with a generic spin (or pseudospin)
+orbit coupling. Using the equation of motion approach for the single-particle
+distribution functions, and a mean-field decoupling of the higher order
+distribution functions, we find a closed form for the charge and spin density
+fluctuations in terms of the charge and spin density linear response functions.
+Approximating the nonlocal exchange term with a Hubbard-like local-field
+factor, we obtain coupled spin and charge density response matrix beyond the
+random phase approximation, whose poles give the dispersion of four collective
+spin-charge modes. We apply our generic technique to the well-explored
+two-dimensional system with Rashba spin-orbit coupling and illustrate how it
+gives results for the collective modes, Drude weight, and spin-Hall
+conductivity which are in very good agreement with the results obtained from
+other more sophisticated approaches.",1710.02712v1
+2019-06-27,Spin-dependent conductance statistics in systems with spin-orbit coupling,"Spin-dependent partial conductances are evaluated in a tight-binding
+description of electron transport in the presence of spin-orbit (SO) couplings,
+using transfer-matrix methods. As the magnitude of SO interactions increases,
+the separation of spin-switching channels from non-spin-switching ones is
+gradually erased. Spin-polarised incident beams are produced by including a
+Zeeman-like term in the Hamiltonian. The exiting polarisation is shown to
+exhibit a maximum as a function of the intensity of SO couplings. For moderate
+site disorder, and both weak and strong SO interactions, no evidence is found
+for a decay of exiting polarisation against increasing system length. With very
+low site disorder and weak SO couplings a spin-filter effect takes place, as
+polarisation {\em increases} with increasing system length.",1906.11804v3
+2021-03-08,Spin-valley coupling in single-electron bilayer graphene quantum dots,"Understanding how the electron spin is coupled to orbital degrees of freedom,
+such as a valley degree of freedom in solid-state systems is central to
+applications in spin-based electronics and quantum computation. Recent
+developments in the preparation of electrostatically-confined quantum dots in
+gapped bilayer graphene (BLG) enables to study the low-energy single-electron
+spectra in BLG quantum dots, which is crucial for potential spin and
+spin-valley qubit operations. Here, we present the observation of the
+spin-valley coupling in a bilayer graphene quantum dot in the single-electron
+regime. By making use of a highly-tunable double quantum dot device we achieve
+an energy resolution allowing us to resolve the lifting of the fourfold spin
+and valley degeneracy by a Kane-Mele type spin-orbit coupling of $\approx
+65~\mu$eV. Also, we find an upper limit of a potentially disorder-induced
+mixing of the $K$ and $K'$ states below $20~\mu$eV.",2103.04825v3
+2007-01-18,Persistent spin and charge currents and magnification effects in open ring conductors subject to Rashba coupling,"We analyze the effect of Rashba spin-orbit coupling and of a local tunnel
+barrier on the persistent spin and charge currents in a one-dimensional
+conducting Aharonov-Bohm (AB) ring symmetrically coupled to two leads. First,
+as an important consequence of the spin-splitting, it is found that a
+persistent spin current can be induced which is not simply proportional to the
+charge current. Second, a magnification effect of the persistent spin current
+is shown when one tunes the Fermi energy near the Fano-type antiresonances of
+the total transmission coefficient governed by the tunnel barrier strength. As
+an unambiguous signature of spin-orbit coupling we also show the possibility to
+produce a persistent pure spin current at the interference zeros of the
+transmittance. This widens the possibilities of employing mesoscopic conducting
+rings in phase-coherent spintronics applications.",0701453v1
+2021-12-14,Coherent control of spin tunneling in a spin-orbit coupled bosonic triple well,"We study the coherent control of spin tunneling for a spin-orbit (SO) coupled
+boson held in a driven triple well. Under high-frequency approximation, we
+analytically obtain the quasienergies of the SO-coupled bosonic triple-well
+system and fine energy band structure is displayed. By adjusting the driving
+parameters, we reveal that the directed selective spin-flipping or
+spin-conserving tunneling of a SO-coupled boson occurs along different pathways
+and in different directions. The analytical results are numerically confirmed
+and perfect agreements are found. Further, a scheme of quantum spin switch with
+or without spin-flipping is presented. These results may be useful for quantum
+information processing and the design of spintronic devices.",2112.07166v1
+2004-11-18,Quantum transport theory for nanostructures with Rashba spin-orbital interaction,"We report on a general theory for analyzing quantum transport through devices
+in the Metal-QD-Metal configuration where QD is a quantum dot or the device
+scattering region which contains Rashba spin-orbital and electron-electron
+interactions. The metal leads may or may not be ferromagnetic, they are assumed
+to weakly couple to the QD region. Our theory is formulated by second
+quantizing the Rashba spin-orbital interaction in spectral space (instead of
+real space), and quantum transport is then analyzed within the Keldysh
+nonequilibrium Green's function formalism. The Rashba interaction causes two
+main effects to the Hamiltonian: (i) it gives rise to an extra spin-dependent
+phase factor in the coupling matrix elements between the leads and the QD; (ii)
+it gives rise to an inter-level spin-flip term but forbids any intra-level
+spin-flips. Our formalism provides a starting point for analyzing many quantum
+transport issues where spin-orbital effects are important. As an example, we
+investigate transport properties of a Aharnov-Bohm ring in which a QD having
+Rashba spin-orbital and e-e interactions is located in one arm of the ring. A
+substantial spin-polarized conductance or current emerges in this device due to
+a combined effect of a magnetic flux and the Rashba interaction. The direction
+and strength of the spin-polarization are shown to be controllable by both the
+magnetic flux and a gate voltage.",0411469v1
+2007-03-16,Spin relaxation at the singlet-triplet crossing in a quantum dot,"We study spin relaxation in a two-electron quantum dot in the vicinity of the
+singlet-triplet crossing. The spin relaxation occurs due to a combined effect
+of the spin-orbit, Zeeman, and electron-phonon interactions. The
+singlet-triplet relaxation rates exhibit strong variations as a function of the
+singlet-triplet splitting. We show that the Coulomb interaction between the
+electrons has two competing effects on the singlet-triplet spin relaxation. One
+effect is to enhance the relative strength of spin-orbit coupling in the
+quantum dot, resulting in larger spin-orbit splittings and thus in a stronger
+coupling of spin to charge. The other effect is to make the charge density
+profiles of the singlet and triplet look similar to each other, thus
+diminishing the ability of charge environments to discriminate between singlet
+and triplet states. We thus find essentially different channels of
+singlet-triplet relaxation for the case of strong and weak Coulomb interaction.
+Finally, for the linear in momentum Dresselhaus and Rashba spin-orbit
+interactions, we calculate the singlet-triplet relaxation rates to leading
+order in the spin-orbit interaction, and find that they are proportional to the
+second power of the Zeeman energy, in agreement with recent experiments on
+triplet-to-singlet relaxation in quantum dots.",0703427v2
+2021-10-11,Interaction-induced quantum spin Hall insulator in the organic Dirac electron system $α$-(BEDT-TSeF)$_2$I$_3$,"Focusing on the recently-discovered candidate topological insulator
+$\alpha$-(BEDT-TSeF)$_2$I$_3$ -- having two-dimensional charge-neutral Dirac
+cones in a low symmetry lattice -- we combine ab-initio and extended-Hubbard
+model calculations to deal with spin-orbit and non-local repulsive
+interactions, and find a realization of an interaction-induced quantum spin
+Hall (QSH) insulator, similar to the one proposed in the honeycomb lattice
+under next-nearest neighbor repulsions. In the absence of repulsive
+interactions, a topological insulator appears by the spin-orbit coupling and is
+characterized by a nonzero spin Chern number. By considering up to next-nearest
+neighbor repulsions at Hartree-Fock level, the intrinsic spin-orbit gap is
+found to grow by orders of magnitude and a QSH insulating phase appears that
+has both a finite spin Chern number and order parameter. Transport coefficients
+and spin susceptibility are calculated and found to consistently account for
+most of the experimental findings, including the metal-to-insulator crossover
+occurring at $\sim50$ K as well as the Berry phase change from 0 to $\pi$ under
+hydrostatic pressure. We argue that such a QSH insulating phase does not
+necessitate a sizeable spin-orbit interaction to generate a large insulating
+gap, which is highly advantageous for the search of novel topological phases in
+generic materials having low symmetry lattice and/or small spin-orbit coupling.",2110.05010v5
+2003-06-19,Theory of the Mercury's spin-orbit motion and analysis of its main librations,"The upcoming space missions, MESSENGER and BepiColombo with onboard
+instrumentation capable of measuring the rotational parameters stimulate the
+objective to reach an accurate theory of the rotational motion of Mercury. For
+obtaining the real motion of Mercury, we have used our relativistic BJV model
+of solar system integration including the coupled spin-orbit motion of the
+Moon. We have extended this model by generalizing the spin-orbit couplings to
+the terrestrial planets, notably Mercury. The updated model is called SONYR
+(acronym of Spin-Orbit N-BodY Relativistic model). The SONYR model giving an
+accurate solution of the spin-orbit motion of Mercury permits to analyze the
+different families of the Hermean rotational librations. The spin-orbit motion
+of Mercury is characterized by two proper frequencies (namely 15.847 and 1066
+years) and its 3:2 resonance presents a second synchronism which can be
+understood as a spin-orbit secular resonance (278 898 years). By using the
+SONYR model, we find a new determination of the mean obliquity, namely 1.6
+arcminutes. Besides, we identify in the Hermean librations the impact of the
+uncertainty of the greatest principal moment of inertia (\cmr2) on the
+obliquity and on the libration in longitude (2.3 mas and 0.45 as respectively
+for an increase of 1% on the \cmr2 value). These determinations prove to be
+suitable for providing constraints on the internal structure of Mercury.",0306387v2
+2013-05-09,Correlated quantum phenomena in the strong spin-orbit regime,"We discuss phenomena arising from the combined influence of electron
+correlation and spin-orbit coupling, with an emphasis on emergent quantum
+phases and transitions in heavy transition metal compounds with 4d and 5d
+elements. A common theme is the influence of spin-orbital entanglement produced
+by spin-orbit coupling, which influences the electronic and magnetic structure.
+In the weak-to-intermediate correlation regime, we show how non-trivial
+band-like topology leads to a plethora of phases related to topological
+insulators. We expound these ideas using the example of pyrochlore iridates,
+showing how many novel phases such as the Weyl semi-metal, axion insulator,
+topological Mott insulator, and topological insulators may arise in this
+context. In the strong correlation regime, we argue that spin-orbital
+entanglement fully or partially removes orbital degeneracy, reducing or
+avoiding the normally ubiquitous Jahn-Teller effect. As we illustrate for the
+honeycomb lattice iridates and double perovskites, this leads to enhanced
+quantum fluctuations of the spin-orbital entangled states and the chance to
+promote exotic quantum spin liquid and multipolar ordered ground states.
+Connections to experiments, materials, and future directions are discussed.",1305.2193v2
+2012-02-28,U(1) Slave-spin theory and its application to Mott transition in a multi-orbital model for iron pnictides,"A U(1) slave-spin representation is introduced for multi-orbital Hubbard
+models. As with the $Z_2$ form of L. de'Medici et al. (Phys. Rev. B 72, 205124
+(2005)), this approach represents a physical electron operator as the product
+of a slave spin and an auxiliary fermion operator. For non-degenerate
+multi-orbital models, our U(1) approach is advantageous in that it captures the
+non-interacting limit at the mean-field level. For systems with either a single
+orbital or degenerate multiple orbitals, the U(1) and $Z_2$ slave-spin
+approachs yield the same results in the slave-spin-condensed phase. In general,
+the U(1) slave-spin approach contains a U(1) gauge redundancy, and properly
+describes a Mott insulating phase. We apply the U(1) slave-spin approach to
+study the metal-to-insulator transition in a five-orbital model for parent iron
+pnictides. We demonstrate a Mott transition as a function of the interactions
+in this model. The nature of the Mott insulating state is influenced by the
+interplay between the Hund's rule coupling and crystal field splittings. In the
+metallic phase, when the Hund's rule coupling is beyond a threshold, there is a
+crossover from a weakly correlated metal to a strongly correlated one, through
+which the quasiparticle speactral weight rapidly drops. The existence of such a
+strongly correlated metallic phase supports the incipient Mott picture of the
+parent iron pnictides. In the parameter regime for this phase and in the
+vicinity of the Mott transition, we find that an orbital selective Mott state
+has nearly as competitive a ground state energy.",1202.6115v1
+2015-07-17,Transverse spin and spin-orbit coupling in silicon waveguides,"Evanescent and tightly confined propagating waves exhibit a remarkable
+transverse spin density since the longitudinal component of the electric field
+is not negligible. In this work, we obtain via numerical simulations the
+electric field components of the fundamental guided modes of two waveguides
+typically used in silicon photonics: the strip and the slot waveguide. We
+obtain the relation between transverse and longitudinal field components, the
+transverse spin densities and other important parameters, such as the
+longitudinal component of the so-called Belinfante spin momentum density. By
+asymmetrically placing a circularly-polarized point-like dipole source in
+regions showing local circular polarization, the guided mode is excited
+unidirectionally via spin-orbit coupling. In contrast to metal plates
+supporting surface plasmons, the multimode behavior of silicon waveguides
+results in different spin-orbit coupling properties for each guided mode. Our
+results may find application in silicon photonic devices, integrated quantum
+optics and polarization manipulation at the nanoscale.",1507.04859v2
+2010-05-28,"Terahertz radiation-induced conductivity, Kerr and Faraday angles, and spin textures in a two-dimensional electron gas with spin-orbit coupling subjected to a high magnetic field and periodic potential","The terahertz radiation-induced conductivity and dielectric polarization
+tensors as well as the Faraday and Kerr rotation angles and the non-equilibrium
+spin textures are studied for two-dimensional electron gas with strong
+spin-orbit coupling subjected to high magnetic field and to tunable periodic
+potential of a two-dimensional gated superlattice. It is found that both real
+and imaginary parts of the frequency-dependent induced conductivity approach
+maximum values with sharp and detectable peaks at frequencies corresponding to
+the inter-subband transitions between spin-split magnetic subbands. The
+observed properties of the conductivity tensor frequency dependence are applied
+for the description of the Kerr and Faraday rotation angles which can be used
+as another experimental tool for describing the electron gas in periodic
+structures with significant spin-orbit coupling. The formation of
+radiation-induced spin textures is predicted having both in-plane and
+out-of-plane components with space distribution scale comparable to the
+superlattice cell size which can be observed experimentally.",1005.5219v2
+2019-10-10,Momentum space imaging of locally noncentrosymmetric superconductors,"The failure of spatial inversion symmetry in noncentrosymmetric materials
+introduces two different types of spin-independent and spin-dependent electron
+hopping. The spin-dependent term can be translated into a quasi-spin-orbit
+coupling and may affect the electronic structure. In the locally
+noncentrosymmetric crystals, the presence of a sublattice degree of freedom
+generates a distinction between the inter- and intra-sublattice hopping
+integrals. The spin-dependent part of the former (latter), which is even (odd)
+under parity, is called symmetric (antisymmetric) quasi-spin-orbit coupling.
+Here, we show the consequences of such quasi-spin-orbit couplings on the
+electronic band structure and study their characteristic features via the
+quasiparticle interference method. We extend our discussions to a realistic
+class of materials, known as transition metal oxides.",1910.04513v2
+2021-07-22,Variability of electron and hole spin qubits due to interface roughness and charge traps,"Semiconductor spin qubits may show significant device-to-device variability
+in the presence of spin-orbit coupling mechanisms. Interface roughness, charge
+traps, layout or process inhomogeneities indeed shape the real space wave
+functions, hence the spin properties. It is, therefore, important to understand
+how reproducible the qubits can be, in order to assess strategies to cope with
+variability, and to set constraints on the quality of materials and
+fabrication. Here we model the variability of single qubit properties (Larmor
+and Rabi frequencies) due to disorder at the Si/SiO$_2$ interface (roughness,
+charge traps) in metal-oxide-semiconductor devices. We consider both electron
+qubits (with synthetic spin-orbit coupling fields created by micro-magnets) and
+hole qubits (with intrinsic spin-orbit coupling). We show that charge traps are
+much more limiting than interface roughness, and can scatter Rabi frequencies
+over one order of magnitude. We discuss the implications for the design of spin
+qubits and for the choice of materials.",2107.10902v2
+2023-05-24,Theory of spin-polarized high-resolution electron energy loss spectroscopy from nonmagnetic surfaces with a large spin-orbit coupling,"The scattering theory of low-energy (slow) electrons has been developed by
+Evans and Mills [Phys. Rev. B 5, 4126 (1972)]. The formalism is merely based on
+the electrostatic Coulomb interaction of the scattering electrons with the
+charge-density fluctuations above the surface and can describe most of the
+interesting features observed in the high-resolution electron energy-loss
+spectroscopy experiments. Here we extend this theory by including the
+spin-orbit coupling in the scattering process. We discuss the impact of this
+interaction on the scattering cross section. In particular, we discuss cases in
+which a spin-polarized electron beam is scattered from nonmagnetic surfaces
+with a strong spin-orbit coupling. We show that under some assumptions one can
+derive an expression for the scattering cross section, which can be used for
+numerical calculations of the spin-polarized spectra recorded by spin-polarized
+high-resolution electron energy-loss spectroscopy experiments.",2305.14887v1
+2006-08-11,Fulde-Ferrel-Larkin-Ovchinnikov State due to Antisymmetric Spin-Orbit-Coupling in Noncentrosymmetric Superconductivity CePt$_3$Si,"When the inversion symmetry is broken, the spin-orbit coupling reduces the
+transition temperature of some types of spin triplet superconductivity, which
+is similar to the case that magnetic field reduces the spin singlet
+superconductivity due to Zeeman splitting. It is well known that
+Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) state of spin singlet superconductivity
+is realized near the Pauli limit (or Chandrasekhar-Clogston limit) of external
+magnetic field. In FFLO state the amplitude of the order parameter is not
+uniform in space. In this paper we study the FFLO state in the spin triplet
+superconductivity in the absence of magnetic field due to the spin-orbit
+coupling. Although the FFLO state is not realized in the simple model with
+spherical Fermi surface, it will be stabilized if some condition is favorable
+for it. We discuss the possibility of FFLO state in CePt$_3$Si in the absence
+of external magnetic field.",0608256v1
+2006-09-29,Nonuniform Spin Triplet Superconductivity due to Antisymmetric Spin-Orbit Coupling in Noncentrosymmetric Superconductor CePt$_3$Si,"We show that the nonuniform state (Fulde-Ferrel-Larkin-Ovchinnikov (FFLO)
+state) of the spin triplet superconductivity in noncentrosymmetric systems is
+stabilized by antisymmetric spin-orbit coupling even if the magnetic field is
+absent. The transition temperature of the spin triplet superconductivity is
+reduced by the antisymmetric spin-orbit coupling in general. This pair breaking
+effect is shown to be similar to the Pauli pair breaking effect due to magnetic
+field for the spin singlet superconductivity, in which FFLO state is stabilized
+near the Pauli limit (or Chandrasekhar-Clogston limit) of external magnetic
+field. Since there are gapless excitations in nonuniform superconducting state,
+some physical quantities such as specific heat and penetration depth should
+obey the power low temperature-dependences. We discuss the possibility of the
+realization of nonuniform state in CePt$_3$Si.",0609751v1
+2007-08-20,Density Functional Theory Characterization of the Multiferroicity in Spin Spiral Chain Cuprates,"The ferroelectricity of the spiral magnets LiCu2O2 and LiCuVO4 was examined
+by calculating the electric polarizations of their spin spiral states on the
+basis of density functional theory with spin-orbit coupling. Our work
+unambiguously reveals that spin-orbit coupling is responsible for the
+ferroelectricity with the primary contribution from the spin-orbit coupling on
+the Cu sites, but the asymmetric density distribution responsible for the
+electric polarization occurs mainly around the O atoms. The electric
+polarization is calculated to be much greater for the ab- than for the bc-plane
+spin spiral. The observed spin-spiral plane is found to be consistent with the
+observed direction of the electric polarization for LiCuVO4, but inconsistent
+for LiCu2O2.",0708.2582v2
+2011-06-06,Quantum Spin Hall Insulators with Interactions and Lattice Anisotropy,"We investigate the interplay between spin-orbit coupling and
+electron-electron interactions on the honeycomb lattice combining the cellular
+dynamical mean-field theory and its real space extension with analytical
+approaches. We provide a thorough analysis of the phase diagram and temperature
+effects at weak spin-orbit coupling. We systematically discuss the stability of
+the quantum spin Hall phase toward interactions and lattice anisotropy
+resulting in the plaquette-honeycomb model. We also show the evolution of the
+helical edge states characteristic of quantum spin Hall insulators as a
+function of Hubbard interaction and anisotropy. At very weak spin-orbit
+coupling and intermediate electron-electron interactions, we substantiate the
+existence of a quantum spin liquid phase.",1106.0943v2
+2012-10-25,Circular dichroism in angle-resolved photoemission spectroscopy of topological insulators,"Topological insulators are a new phase of matter that exhibits exotic surface
+electronic properties. Determining the spin texture of this class of material
+is of paramount importance for both fundamental understanding of its
+topological order and future spin-based applications. In this article, we
+review the recent experimental and theoretical studies on the differential
+coupling of left- versus right-circularly polarized light to the topological
+surface states in angle-resolved photoemission spectroscopy. These studies have
+shown that the polarization of light and the experimental geometry plays a very
+important role in both photocurrent intensity and spin polarization of
+photoelectrons emitted from the topological surface states. A general
+photoemission matrix element calculation with spin-orbit coupling can
+quantitatively explain the observations and is also applicable to topologically
+trivial systems. These experimental and theoretical investigations suggest that
+optical excitation with circularly polarized light is a promising route towards
+mapping the spin-orbit texture and manipulating the spin orientation in
+topological and other spin-orbit coupled materials.",1210.6941v1
+2013-05-10,Spin dynamics in a spin-orbit coupled Fermi gas,"We study the dynamics of a non-degenerate, harmonically trapped Fermi gas
+following a sudden ramp of the spin-orbit coupling strength. In the
+non-interacting limit, we solve the Boltzmann equation in the presence of spin
+orbit coupling analytically, and derive expressions for the dynamics of an
+arbitrary initial spin state. In particular we show that for a fully spin
+polarized initial state, the total magnetization exhibits collapse and revival
+dynamics in time with a period set by the trapping potential. In real space,
+this corresponds to oscillations between a fully polarized state and a spin
+helix. We numerically study the effect of interactions on the dynamics using a
+collisionless Boltzmann equation.",1305.2443v3
+2016-02-15,Kubo-Bastin approach for the spin Hall conductivity of decorated graphene,"Theoretical predictions and recent experimental results suggest one can
+engineer spin Hall effect in graphene by enhancing the spin-orbit coupling in
+the vicinity of an impurity. We use a Chebyshev expansion of the Kubo-Bastin
+formula to compute the spin conductivity tensor for a tight-binding model of
+graphene with randomly distributed impurities absorbed on top of carbon atoms.
+We model the impurity-induced spin-orbit coupling with a graphene-only
+Hamiltonian that takes into account three different
+contributions~\cite{Gmitra2013} and show how the spin Hall and longitudinal
+conductivities depend on the strength of each spin-orbit coupling and the
+concentration of impurities. Additionally, we calculate the real-space
+projection of the density of states in the vicinity of the Dirac point for
+single and multiple impurities and correlate these results with the
+conductivity calculations.",1602.04864v1
+2017-12-30,Singlet-Quintet Mixing in Spin-Orbit Coupled Superconductors with j=3/2 Fermions,"In non-centrosymmetric superconductors, spin-orbit coupling can induce an
+unconventional superconducting state with a mixture of s-wave spin-singlet and
+p-wave spin-triplet channels, which leads to a variety of exotic phenomena,
+including anisotropic upper critical field, magnetoelectric effect, topological
+superconductivity, et al. It is commonly thought that inversion symmetry
+breaking is substantial for pairing-mixed superconducting states. In this work,
+we theoretically propose that a new type of pairing-mixed state, namely the
+mixture of s-wave spin-singlet and d-wave spin-quintet channels, can be induced
+by spin-orbit coupling even in the presence of inversion symmetry when
+electrons effectively carry ""spin-3/2"" in superconductors. As a physical
+consequence of the singlet-quintet pairing mixing, topological nodal-line
+superconductivity is found in such system and gives rise to flat surface
+Majorana bands. Our work provides a possible explanation of unconventional
+superconducting behaviors observed in superconducting half-Heusler compounds.",1801.00083v2
+2020-01-23,Magnetic oscillations induced by phonons in non-magnetic materials,"An unexpected finding two decades ago demonstrated that Shockley electron
+states in noble metal surfaces are spin-polarized, forming a circulating spin
+texture in reciprocal space. The fundamental role played by the spin degree of
+freedom was then revealed, even for a non-magnetic system, whenever the
+spin-orbit coupling was present with some strength. Here we demonstrate that
+similarly to electrons in the presence of spin-orbit coupling, the propagating
+vibrational modes are also accompanied by a well-defined magnetic oscillation
+even in non-magnetic materials. Although this effect is illustrated by
+considering a single layer of the WSe2 dichalogenide, the phenomenon is
+completely general and valid for any non-magnetic material with spin-orbit
+coupling. The emerging phonon-induced magnetic oscillation acts as an
+additional effective flipping mechanism for the electron spin and its
+implications in the transport and scattering properties of the material are
+evident and profound.",2001.08629v1
+2003-03-12,Unusual Symmetries in the Kugel-Khomskii Hamiltonian,"The Kugel-Khomskii Hamiltonian for cubic titanates describes spin and orbital
+superexchange interactions between $d^1$ ions having three-fold degenerate
+$t_{2g}$ orbitals. Since orbitals do not couple along ""inactive"" axes,
+perpendicular to the orbital planes, the total number of electrons in $|\alpha
+>$ orbitals in any such plane and the corresponding total spin are both
+conserved. A Mermin-Wagner construction shows that there is no long-range spin
+ordering at nonzero temperatures. Inclusion of spin-orbit coupling allows such
+ordering, but even then the excitation spectrum is gapless due to a continuous
+symmetry. Thus, the observed order and gap require more symmetry breaking
+terms.",0303219v1
+2018-09-27,Hund's coupling stabilized superconductivity in the presence of spin-orbit interactions,"The intraorbital repulsive Hubbard interaction cannot lead to attractive
+superconducting pairing states, except through the Kohn-Luttinger mechanism.
+This situation may change when we include additional local interactions such as
+the interorbital repulsion $U^\prime$ and Hund's interactions $J$. Adding these
+local interactions, we study the nature of the superconducting pairs in systems
+with tetragonal crystal symmetry including the $d_{xz}$ and $d_{yz}$ orbitals,
+and in octahedral systems including all three of $d_{xz}$, $d_{yz}$, and
+$d_{xy}$ orbitals. In the tetragonal case, spin-orbit interactions can
+stabilize attractive pairing channels containing spin triplet, orbital singlet
+character. Depending on the form of spin-orbit coupling, pairing channels
+belonging to degenerate, non-trivial irreducible representations may be
+stabilized. In the octahedral case, the pairing interactions of superconducting
+channels are found to depend critically on the number of bands crossing the
+Fermi energy.",1809.10714v1
+2020-05-13,Understanding Semiconductor Valence Mass,"The Bloch theorem mathematically proves that in a periodic crystal, electrons
+can acquire a negative mass. The present work aims to provide a physical
+understanding for why this is so. We successively analyze the consequences of
+the 3-fold orbital valence state coupling to (i) a non-degenerate orbital level
+in the conduction band, (ii) a 3-fold orbital level in the conduction band, and
+(iii) spin states through spin-orbit interaction. We show that it is not at all
+trivial for valence electrons to acquire a negative mass for whatever their
+momentum with respect to the crystal axes: it is necessary to not only have a
+coupling to a degenerate orbital conduction level, but also a symmetry breaking
+of the 3-fold valence subspace by the spin quantization axis, as induced by
+spin-orbit interaction. Due to the relativistic origin of this interaction, the
+existence of negative valence masses thus constitutes an unexpected signature
+of quantum relativity.",2005.06328v1
+2021-03-11,"Perpendicular magnetic anisotropy at Fe/Au(111) interface studied by Mössbauer, x-ray absorption, and photoemission spectroscopies","The origin of the interfacial perpendicular magnetic anisotropy (PMA) induced
+in the ultrathin Fe layer on the Au(111) surface was examined using
+synchrotron-radiation-based M\""{o}ssbauer spectroscopy (MS), X-ray magnetic
+circular dichroism (XMCD), and angle-resolved photoemission spectroscopy
+(ARPES). To probe the detailed interfacial electronic structure of orbital
+hybridization between the Fe 3$d$ and Au 6$p$ bands, we detected the
+interfacial proximity effect, which modulates the valence-band electronic
+structure of Fe, resulting in PMA. MS and XMCD measurements were used to detect
+the interfacial magnetic structure and anisotropy in orbital magnetic moments,
+respectively. $In$-$situ$ ARPES also confirms the initial growth of Fe on large
+spin-orbit coupled surface Shockley states under Au(111) modulated electronic
+states in the vicinity of the Fermi level. This suggests that PMA in the
+Fe/Au(111) interface originates from the cooperation effects among the spin,
+orbital magnetic moments in Fe, and large spin-orbit coupling in Au. These
+findings pave the way to develop interfacial PMA using $p$-$d$ hybridization
+with a large spin-orbit interaction.",2103.06572v1
+2021-07-15,Spin-orbit coupling and magnetism in $\rm Sr_2CrO_4$,"With octahedrally coordinated $t_{\rm 2g}$ orbitals which are active at
+filling $n=2$, the $\rm Sr_2CrO_4$ compound exhibits rich interplay of
+spin-orbital physics with tetragonal distortion induced crystal field tuning by
+external agent such as pressure. Considering both reversed and restored crystal
+field regimes, collective spin-orbital excitations are investigated in the
+antiferromagnetic state using the generalized self consistent + fluctuations
+approach including spin-orbit coupling (SOC). A transition is found from
+staggered to entangled orbital order at critical SOC value in the realistic
+regime. Behavior of the calculated energy scales of collective excitations with
+crystal field is in striking similarity to that of the transition temperatures
+with pressure as obtained from susceptibility and resistivity anomalies in
+high-pressure studies.",2107.07214v3
+2022-01-31,Precisely computing bound orbits of spinning bodies around black holes I: General framework and results for nearly equatorial orbits,"Very large mass ratio binary black hole systems are of interest both as a
+clean limit of the two-body problem in general relativity, as well as for their
+importance as sources of low-frequency gravitational waves. At lowest order,
+the smaller body moves along a geodesic of the larger black hole's spacetime.
+Post-geodesic effects include the gravitational self force, which incorporates
+the backreaction of gravitational-wave emission, and the spin-curvature force,
+which arises from coupling of the small body's spin to the black hole's
+spacetime curvature. In this paper, we describe a method for precisely
+computing bound orbits of spinning bodies about black holes. Our analysis
+builds off of pioneering work by Witzany which demonstrated how to describe the
+motion of a spinning body to linear order in the small body's spin. Exploiting
+the fact that in the large mass-ratio limit spinning-body orbits are close to
+geodesics and using closed-form results due to van de Meent describing
+precession of the small body's spin along black hole orbits, we develop a
+frequency-domain formulation of the motion which can be solved very precisely.
+We examine a range of orbits with this formulation, focusing in this paper on
+orbits which are eccentric and nearly equatorial (i.e., the orbit's motion is
+$\mathcal{O}(S)$ out of the equatorial plane), but for which the small body's
+spin is arbitrarily oriented. We discuss generic orbits with general small-body
+spin orientation in a companion paper. We characterize the behavior of these
+orbits and show how the small body's spin shifts the frequencies $\Omega_r$ and
+$\Omega_\phi$ which affect orbital motion. These frequency shifts change
+accumulated phases which are direct gravitational-wave observables,
+illustrating the importance of precisely characterizing these quantities for
+gravitational-wave observations. (Abridged)",2201.13334v2
+2004-11-17,Violation of the Curie law in Na2V3O7 as the crystal-field and spin-orbit coupling effect,"We have shown that the observed drastic violation of the Curie-Weiss law in
+Na2V3O7, reported in Phys. Rev. Lett. 90 (2003) 167202, is caused by
+conventional crystal-field interactions and the intra-atomic spin-orbit
+coupling of the V4+ ion. The fine discrete electronic structure of the 3d1
+configuration, with a substantial orbital moment, is the reason for anomalous
+low-temperature properties of Na2V3O7. According to the Quantum Atomistic
+Solid-State Theory (QUASST) Na2V3O7 is expected to exhibit pronounced
+heavy-fermion phenomena at low temperatures. This study confirm our earlier
+claim that the orbital moment has to be unquenched in description of 3d-atom
+compounds.
+  PACS: 71.70.E, 75.10.D
+  Keywords: crystal-field interactions, spin-orbit coupling, orbital moment,
+Na2V3O7",0411455v1
+2012-09-22,Dynamical Mean-Field Study of Local Pairing Interaction Mediated by Spin and Orbital Fluctuations in Iron Pnictide Superconductors,"We investigate the two-orbital Hubbard model, which reproduces the electron
+and hole Fermi surfaces in the iron pnictide superconductors, in the presence
+of the Jahn-Teller electron-phonon coupling by using the dynamical mean-field
+theory. When the intra- and inter-orbital Coulomb interactions, $U$ and $U'$,
+increase with $U=U'$, both the local spin and orbital susceptibilities,
+$\chi_{s}$ and $\chi_{o}$, increase with $\chi_{s}=\chi_{o}$ because of the
+spin-orbital symmetry. Due to the Hund's rule coupling $J$, $\chi_{s}$ is
+enhanced and dominates over $\chi_{o}$ resulting in the repulsive local pairing
+interaction $V_{\rm loc}>0$, while due to the electron-phonon coupling $g$,
+$\chi_{o}$ is enhanced and dominates over $\chi_{s}$ resulting in the
+attractive one $V_{\rm loc}<0$ which induces the intra-orbital s-wave pairing.
+Remarkably, $V_{\rm loc}$ is weakly dependent on doping and can be attractive
+for heavily electron-doped regime where the superconductivity is observed
+without Fermi surface nesting.",1209.4954v2
+2017-08-21,Spin-orbit coupling in three-orbital Kanamori impurity model and its relevance for transition-metal oxides,"We investigate the effects of the spin-orbit coupling (SOC) in a
+three-orbital impurity model with Kanamori interaction using the numerical
+renormalization group method. We focus on the impurity occupancy $N_d=2$
+relevant to the dynamical mean-field theory studies of Hund's metals. Depending
+on the strength of SOC $\lambda$ we identify three regimes: usual Hund's
+impurity for $|\lambda|<\lambda_c$, van-Vleck non-magnetic impurity for
+$\lambda > \lambda_c$, and a $J=2$ impurity for $\lambda < -\lambda_c$. They
+all correspond to a Fermi liquid but with very different quasiparticle phase
+shifts and different physical properties. The crossover between these regimes
+is controlled by an emergent scale, the orbital Kondo temperature, $\lambda_c
+=T_K^\mathrm{orb}$ that drops with increasing interaction strength. This
+implies that oxides with strong electronic correlations are more prone to the
+effects of the spin-orbit coupling.",1708.06089v1
+2017-05-06,Exciton Polaritons in a Two-Dimensional Lieb Lattice with Spin-Orbit Coupling,"We study exciton-polaritons in a two-dimensional Lieb lattice of
+micropillars. The energy spectrum of the system features two flat bands formed
+from $S$ and $P_{x,y}$ photonic orbitals, into which we trigger bosonic
+condensation under high power excitation. The symmetry of the orbital wave
+functions combined with photonic spin-orbit coupling gives rise to emission
+patterns with pseudospin texture in the flat band condensates. Our work shows
+the potential of polariton lattices for emulating flat band Hamiltonians with
+spin-orbit coupling, orbital degrees of freedom and interactions.",1705.03006v2
+2023-10-25,Polar Kerr Effect in Multiband Spin-Orbit Coupled Superconductors,"We undertake a theoretical analysis to probe the Kerr spectrum within the
+superconducting phase of strontium ruthenate, where the Kerr rotation
+experiments demonstrate the existence of a superconducting state with broken
+time reversal symmetry. We find that spin-orbit coupling changes the
+hybridization along the Fermi surface's diagonal zone mainly affects Hall
+transport. We show that the dominant Hall response arises mainly from the
+quasi-1D orbitals $d_{yz}$ and $d_{xz}$, linked to their hybridization, while
+other contributions are negligible. This establishes that, the breaking of time
+reversal symmetry of quasi-1D orbitals can account for the existence of the
+Kerr angle, irrespective of the order symmetry specific to the $d_{xy}$
+orbital. Moreover, the optical Hall conductivity and Kerr angle estimated for
+the hypothesised superconducting orders also closely match the experimental
+findings, providing important novel insight on the role of the spin-orbit
+coupling, hybridization, and emergent order.",2310.16623v1
+2012-06-21,Magnetism and spin-orbit coupling in Ir-based double perovskites La$_(2-x$Sr$_x$CoIrO$_6$,"We have studied Ir spin and orbital magnetic moments in the double
+perovskites La$_{2-x}$Sr$_x$CoIrO$_6$ by x-ray magnetic circular dichroism. In
+La$_2$CoIrO$_6$, Ir$^{4+}$ couples antiferromagnetically to the weak
+ferromagnetic moment of the canted Co$^{2+}$ sublattice and shows an unusually
+large negative total magnetic moment (-0.38\,$\mu_{\text B}$/f.u.) combined
+with strong spin-orbit interaction. In contrast, in Sr$_2$CoIrO$_6$, Ir$^{5+}$
+has a paramagnetic moment with almost no orbital contribution. A simple
+kinetic-energy-driven mechanism including spin-orbit coupling explains why Ir
+is susceptible to the induction of substantial magnetic moments in the double
+perovskite structure.",1206.4830v1
+2012-09-21,Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces,"The theoretical understanding of the spin-orbit coupling (SOC) effects at
+LaAlO$_{3}$/SrTiO$_{3}$ interfaces and SrTiO$_{3}$ surfaces is still in its
+infancy. We perform first-principles density-functional-theory calculations and
+derive from these a simple tight-binding Hamiltonian, through a Wannier
+function projection and group theoretical analysis. We find striking
+differences to the standard Rashba theory for spin-orbit coupling in
+semiconductor heterostructures due to multi-orbital effects: by far the biggest
+SOC effect is at the crossing point of the $xy$ and $yz$ (or $zx$) orbitals;
+and around the $\Gamma$ point a Rashba spin splitting with a cubic dependence
+on the wave vector $\vec{k}$ is possible.",1209.4705v2
+2014-09-30,Direct observation of spin-orbit coupling in iron-based superconductors,"Spin-orbit coupling (SOC) is a fundamental interaction in solids which can
+induce a broad spectrum of unusual physical properties from topologically
+non-trivial insulating states to unconventional pairing in superconductors. In
+iron-based superconductors (IBS) its role has so far been considered
+insignificant with the models based on spin- or orbital fluctuations pairing
+being the most advanced in the field. Using angle-resolved photoemission
+spectroscopy we directly observe a sizeable spin-orbit splitting in all main
+families of IBS. We demonstrate that its impact on the low-energy electronic
+structure and details of the Fermi surface topology is much stronger than that
+of possible nematic ordering. Intriguingly, the largest pairing gap is always
+supported exactly by SOC-induced Fermi surfaces.",1409.8669v2
+2022-03-04,Interplay of the Jahn--Teller Effect and Spin-Orbit Coupling: The Case of Trigonal Vibronic Modes,"We study an interplay between the orbital degeneracy and spin-orbit coupling
+giving rise to spin-orbital entangled states. As a specific example, we analyze
+the interaction of electrons occupying triply degenerate single-ion $t_{2g}$
+levels with trigonal vibronic modes (the $t\otimes T$ problem). A more general
+problem of the electron-lattice interaction involving both tetragonal and
+trigonal vibrations is also considered. It is shown that the result of such
+interaction crucially depends on the occupation of $t_{2g}$ levels leading to
+either the suppression or enhancement of the Jahn-Teller effect by the
+spin-orbit coupling.",2203.02243v2
+2023-08-20,Exact solutions of a spin-orbit coupling model in two-dimensional central-potentials and quantum-classical correspondence,"In this paper we present both the classical and quantum periodic-orbits of a
+neutral spinning particle constrained in two-dimensional central-potentials
+with a cylindrically symmetric electric-field in addition which leads to an
+effective non-Abelian gauge field generated by the spin-orbit coupling.
+Coherent superposition of orbital angular-eigenfunctions obtained explicitly at
+the condition of zero-energy exhibits the quantum-classical correspondence in
+the meaning of exact coincidence between classical orbits and spatial patterns
+of quantum wave-functions, which as a consequence results in the fractional
+quantization of orbital angular-momentum by the requirement of the same
+rotational symmetry of quantum and classical orbits. A non-Abelian anyon-model
+emerges in a natural way.",2308.10256v1
+2007-02-27,Pairing symmetry in a two-orbital Hubbard model on a square lattice,"We investigate superconductivity in a two-orbital Hubbard model on a square
+lattice by applying fluctuation exchange approximation. In the present model,
+the symmetry of the two orbitals are assumed to be that of an s orbital. Then,
+we find that an s-wave spin-triplet orbital-antisymmetric state and a p-wave
+spin-singlet orbital-antisymmetric state appear when Hund's rule coupling is
+large. These states are prohibited in a single-orbital model within states with
+even frequency dependence, but allowed for multi-orbital systems. We also
+discuss pairing symmetry in other models which are equivalent to the
+two-orbital Hubbard model except for symmetry of orbitals. Finally, we show
+that pairing states with a finite total momentum, even without a magnetic
+field, are possible in a system with two Fermi-surfaces.",0702624v2
+2020-06-12,Occupation switching of $d$ orbitals probed via hyperfine interactions in vanadium dioxide,"Metal-insulator transition was microscopically investigated by
+orbital-resolved nuclear magnetic resonance (OR-NMR) spectroscopy in a single
+crystal of vanadium dioxide VO$_2$. Observations of the anisotropic $^{51}$V
+Knight shift and the nuclear quadrupole frequency allow us to evaluate
+orbital-dependent spin susceptibility and $d$ orbital occupations. The result
+is consistent with the degenerated $t_{2g}$ orbitals in a correlated metallic
+phase and the $d$ orbital ordering in a nonmagnetic insulating phase. The
+predominant orbital pointing along the chain facilitates a spin-singlet
+formation triggering metal-insulator transition. The asymmetry of magnetic and
+electric hyperfine tensors suggests the $d$ orbital reformation favored by a
+low-symmetry crystal field, forming a localized molecular orbital. The result
+highlights the cooperative electron correlation and electron-phonon coupling in
+Mott transition with orbital degrees of freedom.",2006.07030v1
+2011-02-02,Elastic Instabilities within Antiferromagnetically Ordered Phase in the Orbitally-Frustrated Spinel GeCo$_2$O$_4$,"Ultrasound velocity measurements of the orbitally-frustrated GeCo$_2$O$_4$
+reveal unusual elastic instabilities due to the phonon-spin coupling within the
+antiferromagnetic phase. Shear moduli exhibit anomalies arising from the
+coupling to short-range ferromagnetic excitations. Diplike anomalies in the
+magnetic-field dependence of elastic moduli reveal magnetic-field-induced
+orbital order-order transitions. These results strongly suggest the presence of
+geometrical orbital frustration which causes novel orbital phenomena within the
+antiferromagnetic phase.",1102.0469v3
+2019-02-14,Anomalous Spin-Orbit Torques in Magnetic Single-Layer Films,"Spin-orbit interaction (SOI) couples charge and spin transport, enabling
+electrical control of magnetization. A quintessential example of SOI-induced
+transport is the anomalous Hall effect (AHE), first observed in 1880, in which
+an electric current perpendicular to the magnetization in a magnetic film
+generates charge accumulation on the surfaces. Here we report the observation
+of a counterpart of the AHE that we term the anomalous spin-orbit torque
+(ASOT), wherein an electric current parallel to the magnetization generates
+opposite spin-orbit torques on the surfaces of the magnetic film. We interpret
+the ASOT as due to a spin-Hall-like current generated with an efficiency of
+0.053+/-0.003 in Ni80Fe20, comparable to the spin Hall angle of Pt. Similar
+effects are also observed in other common ferromagnetic metals, including Co,
+Ni, and Fe. First principles calculations corroborate the order of magnitude of
+the measured values. This work suggests that a strong spin current with spin
+polarization transverse to magnetization can exist in a ferromagnet, despite
+spin dephasing. It challenges the current understanding of spin-orbit torque in
+magnetic/nonmagnetic bilayers, in which the charge-spin conversion in the
+magnetic layer has been largely neglected.",1902.05490v1
+2015-03-26,Spin-orbit interaction in bent carbon nanotubes: resonant spin transitions,"We develop an effective tight-binding Hamiltonian for spin-orbit (SO)
+interaction in bent carbon nanotubes (CNT) for the electrons forming the $\pi$
+bonds between the nearest neighbor atoms. We account for the bend of the CNT
+and the intrinsic spin-orbit interaction which introduce mixing of $\pi$ and
+$\sigma$ bonds between the $p_z$ orbitals along the CNT. The effect contributes
+to the main origin of the SO coupling--the folding of the graphene plane into
+the nanotube. We discuss the bend-related contribution of the SO coupling for
+resonant single-electron spin and charge transitions in a double quantum dot.
+We report that although the effect of the bend-related SO coupling is weak for
+the energy spectra, it produces a pronounced increase of the spin transition
+rates driven by an external electric field. We find that spin-flipping
+transitions driven by alternate electric fields have usually larger rates when
+accompanied by charge shift from one dot to the other. Spin-flipping transition
+rates are non-monotonic functions of the driving amplitude since they are
+masked by stronger spin-conserving charge transitions. We demonstrate that the
+fractional resonances--counterparts of multiphoton transitions for atoms in
+strong laser fields--occurring in electrically controlled nanodevices already
+at moderate ac amplitudes--can be used to maintain the spin-flip transitions.",1503.07764v2
+2015-09-30,Generic helical edge states due to Rashba spin-orbit coupling in a topological insulator,"We study the helical edge states of a two-dimensional topological insulator
+without axial spin symmetry due to the Rashba spin-orbit interaction. Lack of
+axial spin symmetry can lead to so-called generic helical edge states, which
+have energy-dependent spin orientation. This opens the possibility of inelastic
+backscattering and thereby nonquantized transport. Here we find analytically
+the new dispersion relations and the energy dependent spin orientation of the
+generic helical edge states in the presence of Rashba spin-orbit coupling
+within the Bernevig-Hughes-Zhang model, for both a single isolated edge and for
+a finite width ribbon. In the single-edge case, we analytically quantify the
+energy dependence of the spin orientation, which turns out to be weak for a
+realistic HgTe quantum well. Nevertheless, finite size effects combined with
+Rashba spin-orbit coupling result in two avoided crossings in the energy
+dispersions, where the spin orientation variation of the edge states is very
+significantly increased for realistic parameters. Finally, our analytical
+results are found to compare well to a numerical tight-binding regularization
+of the model.",1509.09183v2
+2015-12-07,An anisotropic spin model of strong spin-orbit-coupled triangular antiferromagnets,"Motivated by the recent experimental progress on the strong
+spin-orbit-coupled rare earth triangular antiferromagnet, we analyze the highly
+anisotropic spin model that describes the interaction between the
+spin-orbit-entangled Kramers' doublet local moments on the triangular lattice.
+We apply the Luttinger-Tisza method, the classical Monte Carlo simulation, and
+the self-consistent spin wave theory to analyze the anisotropic spin
+Hamiltonian. The classical phase diagram includes the 120-degree state and two
+distinct stripe ordered phases. The frustration is very strong and
+significantly suppresses the ordering temperature in the regimes close to the
+phase boundary between two ordered phases. Going beyond the semiclassical
+analysis, we include the quantum fluctuations of the spin moments within a
+self-consistent Dyson-Maleev spin-wave treatment. We find that the strong
+quantum fluctuations melt the magnetic order in the frustrated regions. We
+explore the magnetic excitations in the three different ordered phases as well
+as in strong magnetic fields. Our results provide a guidance for the future
+theoretical study of the generic model and are broadly relevant for strong
+spin-orbit-coupled triangular antiferromagnets such as YbMgGaO4, RCd3P3,
+RZn3P3, RCd3As3, RZn3As3, and R2O2CO3.",1512.02151v3
+2009-04-24,Anisotropic magnetoresistance of spin-orbit coupled carriers scattered from polarized magnetic impurities,"Anisotropic magnetoresistance (AMR) is a relativistic magnetotransport
+phenomenon arising from combined effects of spin-orbit coupling and broken
+symmetry of a ferromagnetically ordered state of the system. In this work we
+focus on one realization of the AMR in which spin-orbit coupling enters via
+specific spin-textures on the carrier Fermi surfaces and ferromagnetism via
+elastic scattering of carriers from polarized magnetic impurities. We report
+detailed heuristic examination, using model spin-orbit coupled systems, of the
+emergence of positive AMR (maximum resistivity for magnetization along
+current), negative AMR (minimum resistivity for magnetization along current),
+and of the crystalline AMR (resistivity depends on the absolute orientation of
+the magnetization and current vectors with respect to the crystal axes)
+components. We emphasize potential qualitative differences between pure
+magnetic and combined electro-magnetic impurity potentials, between short-range
+and long-range impurities, and between spin-1/2 and higher spin-state carriers.
+Conclusions based on our heuristic analysis are supported by exact solutions to
+the integral form of the Boltzmann transport equation in archetypical
+two-dimensional electron systems with Rashba and Dresselhaus spin-orbit
+interactions and in the three-dimensional spherical Kohn-Littinger model. We
+include comments on the relation of our microscopic calculations to standard
+phenomenology of the full angular dependence of the AMR, and on the relevance
+of our study to realistic, two-dimensional conduction-band carrier systems and
+to anisotropic transport in the valence band of diluted magnetic
+semiconductors.",0904.3785v2
+2020-10-15,Longitudinal and transverse electric field manipulation of hole spin-orbit qubits in one-dimensional channels,"Holes confined in semiconductor nanostructures realize qubits where the
+quantum mechanical spin is strongly mixed with the quantum orbital angular
+momentum. The remarkable spin-orbit coupling allows for fast all electrical
+manipulation of such qubits. We study an idealization of a CMOS device where
+the hole is strongly confined in one direction (thin film geometry), while it
+is allowed to move more extensively along a one-dimensional channel. Static
+electric bias and $ac$ electrical driving are applied by metallic gates
+arranged along the channel. In quantum devices based on materials with a bulk
+inversion symmetry, such as silicon or germanium, there exists different
+possible spin-orbit coupling based mechanisms for qubit manipulation. One of
+them, the $g$-tensor magnetic resonance ($g$-TMR), relies on the dependence of
+the effective $g$-factors on the electrical confinement. In this configuration
+the hole is driven by an $ac$ field parallel to the static electric field and
+perpendicular to the channel (transverse driving). Another mechanism, which we
+refer to here as iso-Zeeman electric dipole spin resonance (IZ-EDSR), is due to
+the Rashba spin-orbit coupling that leads to an effective time-dependent
+magnetic field experienced by the pseudo-spin oscillating along the quantum
+channel (longitudinal driving). We compare these two modes of operation and we
+describe the conditions where the magnitudes of the Rabi frequencies are the
+largest. Different regimes can be attained by electrical tuning where the
+coupling to the $ac$ electric field is made either weak or strong...",2010.07787v2
+1998-07-02,"Diamagnetic Effects, Spin Dependent Fermi Surfaces, and the Giant Magnetoresistance in Metallic Multilayers","We study the role of diamagnetic effects on the transport properties of
+metallic magnetic multilayers to elucidate whether they can explain the Giant
+Magnetoresistance (GMR) effect observed in those systems. Realistic Fermi
+surface topologies in layered ferromagnets are taken into account, with the
+possibilities of different types of orbits depending on the electron spin. Both
+configurations, with ferromagnetic and anti-ferromagnetic couplings between
+magnetic layers, are considered and the transmission coefficient for scattering
+at the interface boundary is modelled to include magnetic and roughness
+contributions. We assume that scattering processes conserve the electron spin,
+due to large spin diffusion lengths in multilayer samples. Scattering from the
+spacer mixes different orbit topologies in a way similar to magnetic
+`breakdown' phenomena. For antiferromagnetic coupling, majority and minority
+spins are interchanged from one magnetic layer to the next. Cyclotron orbits
+are also traveled in opposite directions, producing a compensation-like effect
+that yields a huge GMR, particularly for closed orbits. For open orbits, one
+may get the `inverse' magnetoresistance effect along particular directions.",9807026v1
+2007-10-21,Two-dimensional magnetoexcitons in the presence of spin-orbit coupling,"We study theoretically the effect of spin-orbit coupling on quantum well
+excitons in a strong magnetic field. We show that, in the presence of an
+in-plane field component, the excitonic absorption spectrum develops a
+double-peak structure due to hybridization of bright and dark magnetoexcitons.
+If the Rashba and Dresselhaus spin-orbit constants are comparable, the
+magnitude of splitting can be tuned in a wide interval by varying the azimuthal
+angle of the in-plane field. We also show that the interplay between spin-orbit
+and Coulomb interactions leads to an anisotropy of exciton energy dispersion in
+the momentum plane. The results suggest a way for direct optical measurements
+of spin-orbit parameters.",0710.3797v2
+2009-07-04,Mott Insulating Ground State and its Proximity to Spin-Orbit Insulators in Na$_{2}$IrO$_{3}$,"We present an anti-ferromagnetically ordered ground state of
+  Na$_{2}$IrO$_{3}$ based on density-functional-theory calculations including
+both spin-orbit coupling and on-site Coulomb interaction $U$. We show that the
+splitting of $e_{g}'$ doublet states by the strong spin-orbit coupling is
+mainly responsible for the intriguing nature of its insulating gap and magnetic
+ground state. Due to its proximity to the spin-orbit insulator phase, the
+magnetic ordering as obtained with finite $U$ is found to exhibit a strong
+in-plane anisotropy. The phase diagram of Na$_{2}$IrO$_{3}$ suggests a possible
+interplay between spin-orbit insulator and Mott anti-ferromagnetic insulator
+phases.",0907.0743v1
+2020-07-15,Janus Monolayers of Magnetic Transition Metal Dichalcogenides as an All-in-One Platform for Spin-Orbit Torque,"We theoretically predict that vanadium-based Janus dichalcogenide monolayers
+constitute an ideal platform for spin-orbit-torque memories. Using first
+principles calculations, we demonstrate that magnetic exchange and magnetic
+anisotropy energies are higher for heavier chalcogen atoms, while the broken
+inversion symmetry in the Janus form leads to the emergence of Rashba-like
+spin-orbit coupling. The spin-orbit torque efficiency is evaluated using
+optimized quantum transport methodology and found to be comparable to heavy
+nonmagnetic metals. The coexistence of magnetism and spin-orbit coupling in
+such materials with tunable Fermi-level opens new possibilities for monitoring
+magnetization dynamics in the perspective of non-volatile magnetic random
+access memories.",2007.07579v1
+2013-08-14,Spin-orbit interaction induced singularity of the charge density relaxation propagator,"The charge density relaxation propagator of a two dimensional electron
+system, which is the slope of the imaginary part of the polarization function,
+exhibits singularities for bosonic momenta having the order of the spin-orbit
+momentum and depending on the momentum orientation. We have provided an
+intuitive understanding for this non-analytic behavior in terms of the inter
+chirality subband electronic transitions, induced by the combined action of
+Bychkov-Rashba (BR) and Dresselhaus (D) spin-orbit coupling. It is shown that
+the regular behavior of the relaxation propagator is recovered in the presence
+of only one BR or D spin-orbit field or for spin-orbit interaction with equal
+BR and D coupling strengths. This creates a new possibility to influence
+carrier relaxation properties by means of an applied electric field.",1308.3264v2
+2014-06-04,Vortices and vortex states in Rashba spin-orbit-coupled condensates,"The Rashba spin-orbit coupling is equivalent to the finite Yang-Mills flux of
+a static SU(2) gauge field. It gives rise to the protected edge states in
+two-dimensional topological band-insulators, much like magnetic field yields
+the integer quantum Hall effect. An outstanding question is which collective
+topological behaviors of interacting particles are made possible by the Rashba
+spin-orbit coupling. Here we addresses one aspect of this question by exploring
+the Rashba SU(2) analogues of vortices in superconductors. Using the
+Landau-Ginzburg approach and conservation laws, we classify the prominent
+two-dimensional condensates of two- and three-component spin-orbit-coupled
+bosons, and characterize their vortex excitations. There are two prominent
+types of condensates that take advantage of the Rashba spin-orbit coupling.
+Their vortices exist in multiple flavors whose number is determined by the spin
+representation, and interact among themselves through logarithmic or linear
+potentials as a function of distance. The vortices that interact linearly
+exhibit confinement and asymptotic freedom similar to quarks in quantum
+chromodynamics. One of the two condensate types supports small metastable
+neutral quadruplets of vortices, and their tiles as metastable vortex lattices.
+Quantum melting of such vortex lattices could give rise to non-Abelian
+fractional topological insulators, SU(2) analogues of fractional quantum Hall
+states. The physical systems in which these states could exist are trapped two-
+and three-component bosonic ultra-cold atoms subjected to artificial gauge
+fields, as well as solid-state quantum wells made either from Kondo insulators
+such as SmB$_6$ or conventional topological insulators interfaced with
+conventional superconductors.",1406.1198v1
+2018-09-06,Topological Hall Effect in Magnetic Topological Insulator Films,"Geometric Berry phase can be induced either by spin-orbit coupling, giving
+rise to the anomalous Hall effect in ferromagnetic materials, or by chiral spin
+texture, such as skyrmions, leading to the topological Hall effect. Recent
+experiments have revealed that both phenomena can occur in topological
+insulator films with magnetic doping, thus providing us with an intriguing
+platform to study the interplay between these two phenomena. In this work, we
+numerically study the anomalous Hall and topological Hall effects in a
+four-band model that can properly describe the quantum well states in the
+magnetic topological insulator films by combining Landauer-Buttiker formula and
+the iterative Green's function method. Our numerical results suggest that
+spin-orbit coupling in this model plays a different role in the quantum
+transport in the clean and disordered limits. In the clean limit, spin-orbit
+coupling mainly influences the longitudinal transport but does not have much
+effect on topological Hall conductance. Such behavior is further studied
+through the analytical calculation of scattering cross-section due to skyrmion
+within the four-band model. In the disordered limit, the longitudinal transport
+is determined by disorder scattering and spin-orbit coupling is found to affect
+strongly the topological Hall conductance. This sharp contrast unveils a
+dramatic interplay between spin-orbit coupling and disorder effect in
+topological Hall effect in magnetic topological insulator systems.",1809.02210v1
+2005-03-29,Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot,"The spin of a confined electron, when oriented originally in some direction,
+will lose memory of that orientation after some time. Physical mechanisms
+leading to this relaxation of spin memory typically involve either coupling of
+the electron spin to its orbital motion or to nuclear spins. Relaxation of
+confined electron spin has been previously measured only for Zeeman or exchange
+split spin states, where spin-orbit effects dominate relaxation, while spin
+flips due to nuclei have been observed in optical spectroscopy studies. Using
+an isolated GaAs double quantum dot defined by electrostatic gates and direct
+time domain measurements, we investigate in detail spin relaxation for
+arbitrary splitting of spin states. Results demonstrate that electron spin
+flips are dominated by nuclear interactions and are slowed by several orders of
+magnitude when a magnetic field of a few millitesla is applied. These results
+have significant implications for spin-based information processing.",0503687v3
+2002-01-11,Spin Accumulation in Quantum Wires with Strong Rashba Spin-Orbit Coupling,"We present analytical and numerical results for the effect of Rashba
+spin-orbit coupling on band structure, transport, and interaction effects in
+quantum wires when the spin precession length is comparable to the wire width.
+In contrast to the weak-coupling case, no common spin-quantization axis can be
+defined for eigenstates within a single-electron band. The situation with only
+the lowest spin-split subbands occupied is particularly interesting because
+electrons close to Fermi points of the same chirality can have approximately
+parallel spins. We discuss consequences for spin-dependent transport and
+effective Tomonaga-Luttinger descriptions of interactions in the quantum wire.",0201164v2
+2004-09-11,Andreev reflection resonant tunneling through a precessing spin,"We investigate Andreev reflection (AR) resonant tunneling through a
+precessing spin which is coupled to a normal metallic lead and a
+superconducting lead. The formula of the AR conductance at zero temperature is
+obtained as a function of chemical potential and azimuthal angle of the spin
+precessing by using the nonequilibrium Green function method. It is found that
+as the local spin precesses in a weak external magnetic field at Larmor
+frequency $\omega_l$, the AR tunneling conductance exhibits an oscillation at
+the frequency $2\omega_l$ alone. The amplitude of AR conductance oscillation
+enhances with spin-flip tunneling coupling increasing. The study also shows
+that spin-orbit interaction in tunneling barriers is crucial for the
+oscillations of AR conductance. The effect of spin-flip tunneling coupling
+caused by spin-orbit interaction and local spin precessing on resonant behavior
+of the AR conductance are examined.",0409286v1
+2006-01-30,Boundary conditions for spin diffusion,"We develop a general scheme of deriving boundary conditions for spin-charge
+coupled transport in disordered systems with spin-orbit interactions. To
+illustrate the application of the method, we explicitly derive boundary
+conditions for spin diffusion in the Rashba model. Due to the surface spin
+precession, the boundary conditions are non-trivial and contain terms, which
+couple different components of the spin density. We argue that boundary
+conditions and the corresponding electric-field-induced spin accumulation
+generally depend on the nature of the boundary and therefore the spin Hall
+effect in a spin-orbit coupled system can be viewed as a non-universal edge
+phenomenon.",0601677v4
+2006-02-18,Spin conversion rates due to dipolar interactions in mono-isotopic quantum dots at vanishing spin-orbit coupling,"Dipolar interaction between the magnetic moments of electrons is studied as a
+source for electron spin decay in quantum dots or arrays of quantum dots. This
+magnetic interaction will govern spin decay, after other sources, such as the
+coupling to nuclear spins or spin orbit coupling, have been eliminated by a
+suitable sample design. Electron-electron (Coulomb) interactions, important for
+magnetic properties, are included. Decomposing the dipolar operator according
+to the symmetric group of electron permutations allows one to deduce vanishing
+decay channels as a function of electron number and spatial symmetries of the
+quantum dot(s). Moreover, we incorporate the possibility of rapid phonon
+induced spin conserving transitions which crucially affect the temperature
+dependence of spin decay rates. An interesting result is that a sharp increase
+of the spin decay rate occurs already at relatively low temperatures.",0602441v1
+2010-03-31,Inverse Spin Hall Effect and Anomalous Hall Effect in a Two-Dimensional Electron Gas,"We study the coupled dynamics of spin and charge currents in a
+two-dimensional electron gas in the transport diffusive regime. For systems
+with inversion symmetry there are established relations between the spin Hall
+effect, the anomalous Hall effect and the inverse spin Hall effect. However, in
+two-dimensional electron gases of semiconductors like GaAs, inversion symmetry
+is broken so that the standard arguments do not apply. We demonstrate that in
+the presence of a Rashba type of spin-orbit coupling (broken structural
+inversion symmetry) the anomalous Hall effect, the spin Hall and inverse spin
+Hall effect are substantially different effects. Furthermore we discuss the
+inverse spin Hall effect for a two-dimensional electron gas with Rashba and
+Dresselhaus spin-orbit coupling; our results agree with a recent experiment.",1003.6018v1
+2010-04-01,Electron spin dynamics and electron spin resonance in graphene,"A theory of spin relaxation in graphene including intrinsic, Bychkov-Rashba,
+and ripple spin-orbit coupling is presented. We find from spin relaxation data
+by Tombros et al. [Nature 448, 571 (2007).] that intrinsic spin-orbit coupling
+dominates over other contributions with a coupling constant of 3.7 meV.
+Although it is 1-3 orders of magnitude larger than those obtained from first
+principles, we show that comparable values are found for other honeycomb
+systems, MgB2 and LiC6; the latter is studied herein by electron spin resonance
+(ESR). We predict that spin coherence is longer preserved for spins
+perpendicular to the graphene plane, which is beneficial for spintronics. We
+identify experimental conditions when bulk ESR is realizable on graphene.",1004.0210v1
+2011-10-13,Competing Hyperfine and Spin-Orbit Couplings: Spin Relaxation in a Quantum Hall Ferromagnet,"Spin relaxation in a quantum Hall ferromagnet, where filling is $\nu=1, 1/3,
+1/5,...$, can be considered in terms of spin wave annihilation/creation
+processes. Hyperfine coupling with the nuclei of the GaAs matrix provides spin
+non-conservation in the two-dimensional electron gas and determines spin
+relaxation in the quantum Hall system. This mechanism competes with spin-orbit
+coupling channels of spin-wave decay and can even dominate in a low-temperature
+regime where $T$ is much smaller than the Zeeman gap. In this case the
+spin-wave relaxation process occurs non-exponentially with time and does not
+depend on the temperature. The competition of different relaxation channels
+results in crossovers in the dominant mechanism, leading to non-monotonic
+behavior of the characteristic relaxation time with the magnetic field. We
+predict that the relaxation times should reach maxima at $B\simeq 18\,$T in the
+$\nu=1$ Quantum Hall system and at $B\simeq 12\,$T for that of $\nu=1/3\,$. We
+estimate these times as $\sim10\,-\,30\,\mu$s and $\sim2\,-\,5\,\mu$s,
+respectively.",1110.3006v1
+2022-08-23,Topological states in chiral electronic chains,"We consider the influence of topological phases, or their vicinity, on the
+spin density and spin polarization through a chiral chain. We show the
+quantization of the Berry phase in a one-dimensional polarization helix
+structure, under the presence of an external magnetic field, and show its
+influence on the spin density. The polar angle of the momentum space spin
+density becomes quantized in the regime that the Berry phase is quantized, as a
+result of the combined effect of the induced spin-orbit coupling and the
+external transverse magnetic field, while the edge states do not show the polar
+angle quantization, in contrast with the bulk states. Under appropriate
+conditions, the model can be generalized to have similarities with a chain with
+nonhomogeneous Rashba spin- orbit couplings, with zero- or low-energy edge
+states. Due to the breaking of time-reversal symmetry, we recover the effect of
+chiral-induced spin polarization and spin transport across the chiral chain,
+when coupling to external leads. Some consequences of the quantized spin
+polarization and low-energy states on the spin transport are discussed.",2208.10807v1
+2018-11-23,All-Optical Generation and Tuning of Ultrafast Spin-Hall Current via Optical Vortices,"Spin Hall effect, one of the cornerstones in spintronics refers to the
+emergence of an imbalance in the spin density transverse to a charge flow in a
+sample under voltage bias. This study points to a novel way for an ultrafast
+generation and tuning of a unidirectional nonlinear spin Hall current by means
+of subpicosecond laser pulses of optical vortices. When interacting with
+matter, the optical orbital angular momentum (OAM) carried by the vortex and
+quantified by its topological charge is transferred to the charge carriers. The
+residual spin-orbital coupling in the sample together with confinement effects
+allow exploiting the absorbed optical OAM for spatio-temporally controlling the
+spin channels. Both the non-linear spin Hall current and the dynamical spin
+Hall angle increase for a higher optical topological charge. The reason is the
+transfer of a higher amount of OAM and the enhancement of the effective
+spin-orbit interaction strength. No bias voltage is needed. We demonstrate that
+the spin Hall current can be all-optically generated in an open circuit
+geometry for ring-structured samples. These results follow from a full-fledged
+propagation of the spin-dependent quantum dynamics on a time-space grid coupled
+to the phononic environment. The findings point to a versatile and controllable
+tool for the ultrafast generation of spin accumulations with a variety of
+applications such as a source for ultrafast spin transfer torque and charge and
+spin current pulse emitter.",1811.09519v1
+2018-04-13,A note on spin rescalings in post-Newtonian theory,"Usually, the reduced mass $\mu$ is viewed as a dropped factor in $\mu l$ and
+$\mu h$, where $l$ and $h$ are dimensionless Lagrangian and Hamiltonian
+functions. However, it must be retained in post-Newtonian systems of spinning
+compact binaries under a set of scaling spin transformations
+$\mathbf{S}_i=\mathbf{s}_iGM^{2}$ because $l$ and $h$ do not keep the
+consistency of the orbital equations and the spin precession equations but
+$(\mu/M) l$ and $(\mu/M) h$ do. When another set of scaling spin
+transformations $\mathbf{S}_i=\mathbf{s}_iG\mu M$ are adopted, the consistency
+of the orbital and spin equations is kept in $l$ or $h$, and the factor $\mu$
+can be eliminated. In addition, there are some other interesting results as
+follows. The next-to-leading-order spin-orbit interaction is induced in the
+accelerations of the simple Lagrangian of spinning compact binaries with the
+Newtonian and leading-order spin-orbit contributions, and the
+next-to-leading-order spin-spin coupling is present in a post-Newtonian
+Hamiltonian that is exactly equivalent to the Lagrangian formalism. If any
+truncations occur in the Euler-Lagrangian equations or the Hamiltonian, then
+the Lagrangian and Hamiltonian formulations lose their equivalence. In fact,
+the Lagrangian including the accelerations with or without truncations can be
+chaotic for the two bodies spinning, whereas the Hamiltonian without the
+spin-spin term is integrable.",1804.04768v1
+2017-08-07,A generalized Stoner criterion and versatile spin ordering in two-dimensional spin-orbit coupled electron systems,"Spin-orbit coupling is a single-particle phenomenon known to generate
+topological order, and electron-electron interactions cause ordered many-body
+phases to exist. The rich interplay of these two mechanisms is present in a
+broad range of materials, and has been the subject of considerable ongoing
+research and controversy. Here we demonstrate that interacting two-dimensional
+electron systems with strong spin-orbit coupling exhibit a variety of time
+reversal symmetry breaking phases with unconventional spin alignment. We first
+prove that a Stoner-type criterion can be formulated for the spin polarization
+response to an electric field, which predicts that the spin polarization
+susceptibility diverges at a certain value of the electron-electron interaction
+strength. The divergence indicates the possibility of unconventional
+ferromagnetic phases even in the absence of any applied electric or magnetic
+field. This leads us, in the second part of this work, to study interacting
+Rashba spin-orbit coupled semiconductors in equilibrium in the Hartree-Fock
+approximation as a generic minimal model. Using classical Monte-Carlo
+simulations we construct the complete phase diagram of the system as a function
+of density and spin-orbit coupling strength. It includes both an out-of-plane
+spin polarized phase and in-plane spin-polarized phases with shifted Fermi
+surfaces and rich spin textures, reminiscent of the Pomeranchuk instability, as
+well as two different Fermi-liquid phases having one and two Fermi surfaces,
+respectively, which are separated by a Lifshitz transition. We discuss
+possibilities for experimental observation and useful application of these
+novel phases, especially in the context of electric-field-controlled
+macroscopic spin polarizations.",1708.01971v1
+2021-06-18,Study of Spin-Orbit Interactions and Interlayer Ferromagnetic Coupling in Co/Pt/Co Trilayers in Wide Range of Heavy Metal Thickness,"The spin-orbit torque, a torque induced by a charge current flowing through
+the heavy-metal conducting layer with strong spin-orbit interactions, provides
+an efficient way to control the magnetization direction in
+heavy-metal/ferromagnet nanostructures, required for applications in the
+emergent magnetic technologies like random access memories, high-frequency nano
+oscillators, or bio-inspired neuromorphic computations. We study the interface
+properties, magnetization dynamics, magnetostatic features and spin-orbit
+interactions within the multilayer system
+Ti(2)/Co(1)/Pt(0-4)/Co(1)/MgO(2)/Ti(2) (thicknesses in nanometers) patterned by
+optical lithography on micrometer-sized bars. In the investigated devices, Pt
+is used as a source of the spin current and as a non-magnetic spacer with
+variable thickness, which enables the magnitude of the interlayer ferromagnetic
+exchange coupling to be effectively tuned. We also find the Pt
+thickness-dependent changes in magnetic anisotropies, magnetoresistance,
+effective Hall angle and, eventually, spin-orbit torque fields at interfaces.
+The experimental findings are supported by the relevant interface
+structure-related simulations, micromagnetic, macrospin, as well as the spin
+drift-diffusion models. Finally, the contribution of the spin-orbital
+Edelstein-Rashba interfacial fields is also briefly discussed in the analysis.",2106.10103v1
+2007-01-13,Theory of conserved spin current and its application to two dimensional hole gas,"We present a detailed microscopic theory of the conserved spin current which
+is introduced by us [Phys. Rev. Lett. \textbf{96}, 196602 (2006)] and satisfies
+the spin continuity equation even for spin-orbit coupled systems. The spin
+transport coefficients $\sigma_{\mu\nu}^{s}$ as a response to the electric
+field are shown to consist of two parts, i.e., the conventional part
+$\sigma_{\mu\nu}^{s0}$ and the spin torque dipole correction $\sigma_{\mu\nu
+}^{s\tau}$. As one key result, an Onsager relation between $\sigma_{\mu\nu
+}^{s}$ and other kinds of transport coefficients are shown. The expression for
+$\sigma_{\mu\nu}^{s}$ in terms of single-particle Bloch states are derived, by
+use of which we study the conserved spin Hall conductivity in the two
+dimensional hole gas modeled by a combined Luttinger and SIA Rashba spin-orbit
+coupling. It is shown that the two components in spin Hall conductivity usually
+have the opposite contributions. While in the absence of Rashba spin splitting,
+the spin Hall transport is dominated by the conventional contribution, the
+presence of Rashba spin splitting stirs up a large enhancement of the spin
+torque dipole correction, leading to an overall sign change for the total spin
+Hall conductivity. Furthermore, an approximate two-band calculation and the
+subsequent comparison with the exact four-band results are given, which reveals
+that the coupling between the heavy hole and light hole bands should be taken
+into account for strong Rashba spin splitting.",0701293v1
+2014-09-05,Edge binding of sine-Gordon solitons in spin-orbit coupled Bose-Einstein condensates,"In recent experiments with ultracold gases a Raman coupling scheme is used to
+produce both spin-orbit (SO) and Zeeman-type couplings [Y.-J. Lin et al.,
+Nature 471, 83 (2011)]. Their competition drives a phase transition to a
+magnetized state with broken $Z_2$ symmetry. Using a hydrodynamic approach we
+study a confined binary condensate subject to both SO and Zeeman-type
+couplings. We find that in the limit of small healing length and in the phase
+with unbroken symmetry, the boundary magnetization profile has an analytical
+solution in the form of a sine-Gordon soliton. The soliton is bound to the edge
+of the system by the nontrivial boundary condition resulting from the combined
+effect of the SO coupling and the drop in the particle density. The same
+boundary condition is important in the magnetized phase as well, where we
+characterize numerically the boundary spin structure. We further discuss how
+the nontrivial magnetization structure affects the density profile near the
+boundary, yet another prediction that can be tested in current experiments of
+spin-orbit coupled condensates.",1409.1885v2
+2014-10-22,Polarization of a quasi two-dimensional repulsive Fermi gas with Rashba spin-orbit coupling: a variational study,"Motivated by the remarkable experimental control of synthetic gauge fields in
+ultracold atomic systems, we investigate the effect of an artificial Rashba
+spin-orbit coupling on the spin polarization of a two-dimensional repulsive
+Fermi gas. By using a variational many-body wavefunction, based on a suitable
+spinorial structure, we find that the polarization properties of the system are
+indeed controlled by the interplay between spin-orbit coupling and repulsive
+interaction. In particular, two main effects are found: 1) The Rashba coupling
+determines a gradual increase of the degree of polarization beyond the critical
+repulsive interaction strength, at variance with conventional 2D Stoner
+instability. 2) The critical interaction strength, above which finite
+polarization is developed, shows a dependence on the Rashba coupling, i.e. it
+is enhanced in case the Rashba coupling exceeds a critical value. A simple
+analytic expression for the critical interaction strength is further derived in
+the context of our variational formulation, which allows for a straightforward
+and insightful analysis of the present problem.",1410.5938v1
+2013-08-16,Strong Coupling Expansion of the Extended Hubbard Model with Spin-Orbit Coupling,"We study the strong coupling limit of the extended Hubbard model in two
+dimensions. The model consists of hopping, on-site interaction,
+nearest-neighbor interaction, spin-orbit coupling and Zeeman spin splitting.
+While the study of this model is motivated by a search for topological phases
+and in particular a topological superconductor, the methodology we develop may
+be useful for a variety of systems. We begin our treatment with a canonical
+transformation of the Hamiltonian to an effective model which is appropriate
+when the (quartic) interaction terms are larger than the (quadratic) kinetic
+and spin-orbit coupling terms. We proceed by analyzing the strong coupling
+model variationally. Since we are mostly interested in a superconducting phase
+we use a Gutzwiller projected BCS wavefunction as our variational state. To
+continue analytically we employ the Gutzwiller approximation and compare the
+calculated energy with Monte-Carlo calculations. Finally we determine the
+topology of the ground state and map out the topology phase diagram.",1308.3731v2
+2007-11-09,Semiconductor Spintronics,"Spintronics refers commonly to phenomena in which the spin of electrons in a
+solid state environment plays the determining role. In a more narrow sense
+spintronics is an emerging research field of electronics: spintronics devices
+are based on a spin control of electronics, or on an electrical and optical
+control of spin or magnetism. This review presents selected themes of
+semiconductor spintronics, introducing important concepts in spin transport,
+spin injection, Silsbee-Johnson spin-charge coupling, and spindependent
+tunneling, as well as spin relaxation and spin dynamics. The most fundamental
+spin-dependent nteraction in nonmagnetic semiconductors is spin-orbit coupling.
+Depending on the crystal symmetries of the material, as well as on the
+structural properties of semiconductor based heterostructures, the spin-orbit
+coupling takes on different functional forms, giving a nice playground of
+effective spin-orbit Hamiltonians. The effective Hamiltonians for the most
+relevant classes of materials and heterostructures are derived here from
+realistic electronic band structure descriptions. Most semiconductor device
+systems are still theoretical concepts, waiting for experimental
+demonstrations. A review of selected proposed, and a few demonstrated devices
+is presented, with detailed description of two important classes: magnetic
+resonant tunnel structures and bipolar magnetic diodes and transistors. In most
+cases the presentation is of tutorial style, introducing the essential
+theoretical formalism at an accessible level, with case-study-like
+illustrations of actual experimental results, as well as with brief reviews of
+relevant recent achievements in the field.",0711.1461v1
+2022-09-06,Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings,"The interaction between the linear and cubic spin-orbit coupling with
+magnetic moments and mobile spin-polarized carriers in the LaO/STO system
+provides new avenues for spin transport applications. We study the interplay
+between linear and cubic Rashba spin orbit coupling (RSOC) on in-plane magnetic
+moments in the LaO/STO system using the Boltzmann transport theory based on the
+relaxation time approximation (RTA) and the more refined Schliemann-Loss (SL)
+delta-potential scattering model. In general, both methods yield a linear
+(quadratic) relationship between the spin accumulation (spin current) when one
+of the three RSOC strengths is varied and the other two fixed. The simultaneous
+presence of multiple types of RSOC with distinct angular dependences is a key
+ingredient in breaking the k-space symmetry of the Fermi surface, thus ensuring
+a finite spin accumulation upon integration over the entire Fermi surface.
+While the oft-used RTA method is sufficiently accurate for spin accumulation
+calculations, the more refined SL model is required for spin current
+calculations because the RTA method neglects the anisotropy of the Fermi
+contour arising from the cubic RSOC terms. Based on the refined SL model and
+under optimal tuning of the RSOC parameters, the spin charge conversion values
+in LaO/STO is predicted to reach a remarkable efficiency of 30.",2209.02859v1
+2014-03-31,Degenerate Quantum Gases with Spin-Orbit Coupling,"This review focuses on recent developments on studying synthetic spin-orbit
+(SO) coupling in ultracold atomic gases. Two types of SO coupling are
+discussed. One is Raman process induced coupling between spin and motion along
+one of the spatial directions, and the other is Rashba SO coupling. We
+emphasize their common features in both single-particle and two-body physics
+and their consequences in many-body physics. For instance, single particle
+ground state degeneracy leads to novel features of superfluidity and richer
+phase diagram; increased low-energy density-of-state enhances interaction
+effects; the absence of Galilean invariance and spin-momentum locking give rise
+to intriguing behaviors of superfluid critical velocity and novel quantum
+dynamics; and mixing of two-body singlet and triplet states yields novel
+fermion pairing structure and topological superfluids. With these examples, we
+show that investigating SO coupling in cold atom systems can enrich our
+understanding of basic phenomena such as superfluidity, provide a good platform
+for simulating condensed matter states such as topological superfluids, and
+more importantly, result in novel quantum systems such as SO coupled unitary
+Fermi gas or high spin quantum gases. Finally we also point out major
+challenges and possible future directions.",1403.8021v2
+2017-06-27,Nonlinear spin current generation in noncentrosymmetric spin-orbit coupled systems,"Spin current plays a central role in spintronics. In particular, finding more
+efficient ways to generate spin current has been an important issue and studied
+actively. For example, representative methods of spin current generation
+include spin polarized current injections from ferromagnetic metals, spin Hall
+effect, and spin battery. Here we theoretically propose a new mechanism of spin
+current generation based on nonlinear phenomena. By using Boltzmann transport
+theory, we show that a simple application of the electric field $\bf{E}$
+induces spin current proportional to $\bf{E^2}$ in noncentrosymmetric
+spin-orbit coupled systems. We demonstrate that the nonlinear spin current of
+the proposed mechanism is supported in the surface state of three-dimensional
+topological insulators and two-dimensional semiconductors with the Rashba
+and/or Dresselhaus interaction. In the latter case, the angular dependence of
+the nonlinear spin current can be manipulated by the direction of the electric
+field and by the ratio of the Rashba and Dresselhaus interactions. We find that
+the magnitude of the spin current largely exceeds those in the previous methods
+for a reasonable magnitude of the electric field. Furthermore, we show that
+application of AC electric fields (e.g. terahertz light) leads to the
+rectifying effect of the spin current where DC spin current is generated. These
+findings will pave a new route to manipulate the spin current in
+noncentrosymmetric crystals.",1706.08647v1
+2013-11-01,Anomalous D'yakonov-Perel' spin relaxation in InAs (110) quantum wells under strong magnetic field: role of Hartree-Fock self-energy,"We investigate the influence of the Hartree-Fock self-energy, acting as an
+effective magnetic field, on the anomalous D'yakonov-Perel' spin relaxation in
+InAs (110) quantum wells when the magnetic field in the Voigt configuration is
+much stronger than the spin-orbit-coupled field. The transverse and
+longitudinal spin relaxations are discussed both analytically and numerically.
+For the transverse configuration, it is found that the spin relaxation is very
+sensitive to the Hartree-Fock effective magnetic field, which is very different
+from the conventional D'yakonov-Perel' spin relaxation. Even an extremely small
+spin polarization ($P=0.1\%$) can significantly influence the behavior of the
+spin relaxation. It is further revealed that this comes from the {\em unique}
+form of the effective inhomogeneous broadening, originated from the mutually
+perpendicular spin-orbit-coupled field and strong magnetic field. It is shown
+that this effective inhomogeneous broadening is very small and hence very
+sensitive to the Hartree-Fock field. Moreover, we further find that in the spin
+polarization dependence, the transverse spin relaxation time decreases with the
+increase of the spin polarization in the intermediate spin polarization regime,
+which is also very different from the conventional situation, where the spin
+relaxation is always suppressed by the Hartree-Fock field. It is revealed that
+this {\em opposite} trends come from the additional spin relaxation channel
+induced by the HF field. For the longitudinal configuration, we find that the
+spin relaxation can be either suppressed or enhanced by the Hartree-Fock field
+if the spin polarization is parallel or antiparallel to the magnetic field.",1311.0097v1
+2018-11-15,Decays of Majorana or Andreev oscillations induced by steplike spin-orbit coupling,"The Majorana zero mode in the semiconductor-superconductor nanowire is one of
+the promising candidates for topological quantum computing. Recently, in
+islands of nanowires, subgap-state energies have been experimentally observed
+to oscillate as a function of the magnetic field, showing a signature of
+overlapped Majorana bound states. However, the oscillation amplitude either
+dies away after an overshoot or decays, sharply opposite to the theoretically
+predicted enhanced oscillations for Majorana bound states. We reveal that a
+steplike distribution of spin-orbit coupling in realistic devices can induce
+the decaying Majorana oscillations, resulting from the coupling-induced energy
+repulsion between the quasiparticle spectra on the two sides of the step. This
+steplike spin-orbit coupling can also lead to decaying oscillations in the
+spectrum of the Andreev bound states. For Coulomb-blockade peaks mediated by
+the Majorana bound states, the peak spacings have been predicted to correlate
+with peak heights by a $\pi/2$ phase shift, which was ambiguous in recent
+experiments and may be explained by the steplike spin-orbit coupling. Our work
+will inspire more works to reexamine effects of the nonuniform spin-orbit
+coupling, which is generally present in experimental devices.",1811.06136v3
+2002-04-18,Quantum dots with Rashba spin-orbit coupling,"We present results on the effects of spin-orbit coupling on the electronic
+structure of few-electron interacting quantum dots. The ground-state properties
+as a function of the number of electrons in the dot $N$ are calculated by means
+of spin density functional theory. We find a suppression of Hund's rule due to
+the competition of the Rashba effect and exchange interaction. Introducing an
+in-plane Zeeman field leads to a paramagnetic behavior of the dot in a closed
+shell configuration, and to spin texture in space.",0204410v2
+2003-07-01,Spin-orbit coupling and intrinsic spin mixing in quantum dots,"Spin-orbit coupling effects are studied in quantum dots in InSb, a narrow-gap
+material. Competition between different Rashba and Dresselhaus terms is shown
+to produce wholesale changes in the spectrum. The large (and negative)
+$g$-factor and the Rashba field produce states where spin is no longer a good
+quantum number and intrinsic flips occur at moderate magnetic fields. For dots
+with two electrons, a singlet-triplet mixing occurs in the ground state, with
+observable signatures in intraband FIR absorption, and possible importance in
+quantum computation.",0307027v1
+2005-06-29,Rashba spin-orbit coupling and spin precession in carbon nanotubes,"The Rashba spin-orbit coupling in carbon nanotubes and its effect on
+spin-dependent transport properties are analyzed theoretically. We focus on
+clean non-interacting nanotubes with tunable number of subbands $N$. The
+peculiar band structure is shown to allow in principle for Datta-Das
+oscillatory behavior in the tunneling magnetoresistance as a function of gate
+voltage, despite the presence of multiple bands. We discuss the conditions for
+observing Datta-Das oscillations in carbon nanotubes.",0506761v2
+2007-04-07,Spin state mixing in InAs double quantum dots,"We quantify the contributions of hyperfine and spin-orbit mediated
+singlet-triplet mixing in weakly coupled InAs quantum dots by electron
+transport spectroscopy in the Pauli spin blockade regime. In contrast to double
+dots in GaAs, the spin-orbit coupling is found to be more than two orders of
+magnitudes larger than the hyperfine mixing energy. It is already effective at
+magnetic fields of a few mT, where deviations from hyperfine mixing are
+observed.",0704.0980v1
+2013-05-14,Graphene with time-dependent spin-orbit coupling: Truncated Magnus expansion approach,"We analyze the role of ac-driven Rashba spin-orbit coupling in monolayer
+graphene including a spin-dependent mass term. Using the Magnus expansion as a
+semi-analytical approximation scheme a full account of the quasienergie
+spectrum of spin states is given. We discuss the subtleties arising in
+correctly applying the Magnus expansion technique in order to determine the
+quasienergy spectrum. Comparison to the exact numerical solution gives
+appropriate boundaries to the validity of the Magnus expansion solution.",1305.3140v1
+2014-04-25,Spin-orbit coupling and optical spin Hall effect in photonic graphene,"We study the spin-orbit coupling induced by the splitting between TE and TM
+optical modes in a photonic honeycomb lattice. Using a tight-binding approach,
+we calculate analytically the band structure. Close to the Dirac point,we
+derive an effective Hamiltonian. We find that the local reduced symmetry
+($\mathrm{D_{3h}}$) transforms the TE-TM effective magnetic field into an
+emergent field with a Dresselhaus symmetry. As a result, particles become
+massive, but no gap opens. The emergent field symmetry is revealed by the
+optical spin Hall effect.",1404.6395v1
+2016-07-18,Signature of topological transition in persistent current in a Dirac Ring,"We study the persistent current in a one dimensional Dirac ring and show that
+the change of spin current with respect to an applied perpendicular electric
+field can be used to identify the topological phases. We further study the
+effect of Rashba spin orbit coupling and show that the Aharonov-Casher phase
+appearing due to Rashba spin orbit coupling vanishes in topologically
+nontrivial regime and thus can identify the topological phases. This
+Aharonov-Casher phase causes a finite spin-valley current in presence of valley
+mixing perturbation and is thus useful to detect the topological phases even in
+presence of such impurity.",1607.05052v1
+2008-07-03,Zero-size objects in Riemann-Cartan spacetime,"We use the conservation law of the stress-energy and spin tensors to study
+the motion of massive zero-size objects in Riemann-Cartan geometry. The
+resultant world line equations turn out to exhibit a novel spin-curvature
+coupling. In particular, the spin of the Dirac particle does not couple to the
+background curvature. This is a consequence of its truly zero size which
+consistently rules out the orbital degrees of freedom. As a test of
+consistency, the wave packet solution of the free Dirac equation is considered.
+It is shown that the wave packet spin and orbital angular momentum disappear
+simultaneously in the zero-size limit.",0807.0596v1
+2019-06-24,Quantum Spin Hall Effect in Electric and Magnetic Fields without Spin-Orbit Coupling,"From the Dirac equation of an electron in an anisotropic conduction band, the
+anisotropy of its motion dramatically affects its interaction with applied
+electric and magnetic fields. The quantum spin Hall effect (QSHE) is observable
+in two-dimensional metals without spin-orbit coupling. The dimensionality of
+the Zeeman interaction plays an important role in the QSHE, and profoundly
+modifies many interpretations of measurements of the Knight shift and of the
+upper critical field in highly anisotropic superconductors.",1906.10164v1
+2017-05-10,Optical Selection Rules in Spin-Orbit Coupled Systems on Honeycomb Lattice,"We investigate the optical properties in a minimal model of spin-orbit
+coupled systems on honeycomb lattice at half-filling. The absorption of the
+circularly polarized light in the charge and antiferromagnetic ordered states
+is particularly studied, and the spin-valley selective excitation depending on
+the handedness of the light is found. It is shown that the optical selection
+rules plainly differ with the type of broken symmetries and topological
+properties of the electronic states. Consequently, the abrupt change of
+spin-valley selectivity in the optical absorption occurs at the topological
+transition caused by changing the magnitude of the order parameters.",1705.03632v1
+2017-11-12,Highly relativistic spin-gravity-$Λ$ coupling,"The effects of highly relativistic spin-gravity coupling in the
+Schwarzschild-de Sitter background which follow from the Mathisson-Papapetrou
+equations are investigated. The dependence of gravitoelectric and
+gravitomagnetic components of gravitational field on the velocity of an
+observer which is moving in Schwarzschild-de Sitter's background is estimated.
+The action of gravitomagnetic components on a fast moving spinning particle is
+considered. Different cases of the highly relativistic circular orbits of a
+spinning particle which essentially differ from the corresponding geodesic
+orbits are described.",1711.04270v2
+2018-03-13,Berry curvature and symmetry broken induced Hall effect in MoS2,"Inversion symmetry breaking and spin-orbit coupling lead to valley and spin
+Hall effect in MoS2. Because of the large valley separation in momentum space,
+the valley index is expected to be robust. In this paper, quantum Hall effect
+in MoS2 originated from Berry curvature is analyzed after review of symmetry
+structure and spin-orbit coupling Hamiltonian of MoS2. Finally an expression
+and rough calculation is given for valley and spin Hall effect.",1803.05325v1
+2013-04-08,Study of unconventional superfluid phases and the phase dynamics in spin-orbit coupled bose system,"We study the phase distribution and its dynamics in spin-orbit coupled two
+component ultracold Bosons for finite size system. Using an inhomogeneous
+meanfield analysis we demonstrate how phase distribution evolves as we tune the
+spin-orbit coupling $\gamma$ and $t$, the spin-independent hopping. For
+$t>>\gamma$ we find the homogeneous superfluid phase. As we increase $\gamma$,
+differences in the phases of the order parameter grows leading to twisted
+superfluid phase. For $t \sim \gamma$ competing orderings in the phase
+distribution is observed. At large $\gamma$ limit a Ferro-Magnetic stripe
+ordering appears along the diagonal. We explain that this is due to the
+frustration bought in by the spin-orbit interaction. Isolated vortex formation
+is also shown to appear. We also investigate the possible collective modes. In
+deep superfluid regime we derive the equation of motion for the phases
+following a semi-classical approximation. Imaginary frequencies indicating the
+damped modes are seen to appear and the dynamics of lowest normal modes are
+discussed.",1304.2098v1
+2013-12-14,Spin-Orbit Driven Transitions Between Mott Insulators and Finite Momentum Superfluids of Bosons in Optical Lattices,"Synthetic spin-orbit coupling in ultracold atomic gases can be taken to
+extremes rarely found in solids. We study a two dimensional Hubbard model of
+bosons in an optical lattice in the presence of spin-orbit coupling strong
+enough to drive direct transitions from Mott insulators to superfluids. Here we
+find phase-modulated superfluids with finite momentum that are generated
+entirely by spin-orbit coupling. We investigate the rich phase patterns of the
+superfluids, which may be directly probed using time-of-flight imaging of the
+spin-dependent momentum distribution.",1312.4011v2
+2015-03-17,Self-force gravitational waveforms for extreme and intermediate mass ratio inspirals. III: Spin-orbit coupling revisited,"The first- and second-order dissipative self force and the first order
+conservative self force are applied together with spin-orbit coupling to the
+quasi-circular motion of a test mass in the spacetime of a Schwarzschild black
+hole, for extreme or intermediate mass ratios. The partial dephasing of the
+gravitational waveform (at the order that is independent of the system's mass
+ratio) due to the self force is compared with that of spin-orbit coupling. We
+find that accurate waveforms for parameter estimation need to include both
+effects. Specifically, we find a particular value for the spin parameter such
+that the spin-orbit effect cancels out the self-force effect on the waveform.
+Exclusion of dephasing effects that are independent of the mass ratio therefore
+might lead to a non-perturbative error in the estimation of the system's
+parameters.",1503.05097v2
+2015-06-05,Unconventional dc transport in Rashba electron gases,"We discuss the transport properties of a disordered two-dimensional electron
+gas with strong Rashba spin-orbit coupling. We show that in the high-density
+regime where the Fermi energy overcomes the energy associated with spin-orbit
+coupling, dc transport is accurately described by a standard Drude's law, due
+to a non-trivial compensation between the suppression of back-scattering and
+the relativistic correction to the quasi-particle velocity. On the contrary,
+when the system enters the opposite dominant spin-orbit regime, Drude's
+paradigm breaks down and the dc conductivity becomes strongly sensitive to the
+spin-orbit coupling strength, providing a suitable tool to test the
+entanglement between spin and charge degrees of freedom in these",1506.01944v2
+2016-09-07,Motion of solitons in one-dimensional spin-orbit-coupled Bose-Einstein condensates,"Solitons play a fundamental role in dynamics of nonlinear excitations. Here
+we explore the motion of solitons in one-dimensional uniform Bose-Einstein
+condensates subjected to a spin-orbit coupling (SOC). We demonstrate that the
+spin dynamics of solitons is governed by a nonlinear Bloch equation. The spin
+dynamics influences the orbital motion of the solitons leading to the
+spin-orbit effects in the dynamics of the macroscopic quantum objects
+(mean-field solitons). The latter perform oscillations with a frequency
+determined by the SOC, Raman coupling, and intrinsic nonlinearity. These
+findings reveal unique features of solitons affected by the SOC, which is
+confirmed by analytical considerations and numerical simulations of the
+underlying Gross-Pitaevskii equations.",1609.02164v1
+2017-08-17,Spin-orbit enhanced carrier lifetimes in noncentrosymmetric semiconductors,"We show that the carrier recombination rate of noncentrosymmetric materials
+can be strongly modified by spin-orbit coupling. Our proposed mechanism
+involves the separation of conduction and valence bands into their respective
+spin components, which changes the transition dipole moments between them. The
+change in the carrier recombination can be either positive or negative in sign,
+or vary depending on the location of carriers in the Brillouin zone. We have
+performed a large scale DFT screening study to identify candidate materials
+that display this effect. We have selected three materials, Pb$_4$SeBr$_6$,
+ReTe$_3$Br$_5$, and CsCu(BiS$_2$)$_2$, which span the range of behaviors, and
+discuss their electronic band structure in greater detail. We find transition
+dipole moment enhancement factors of up to three orders of magnitude,
+reflecting the physical impact of spin-orbit coupling on the carrier lifetime.
+Therefore, further explorations of the spin-orbit coupling and lattice symmetry
+could prove to be useful for manipulating the photophysics of materials.",1708.05436v1
+2018-03-19,Spin-orbital-lattice entangled states in cubic $d^1$ double perovskites,"Interplay of spin-orbit coupling and vibronic coupling on heavy $d^1$ site of
+cubic double perovskites is investigated by ab initio calculations. The
+stabilization energy of spin-orbital-lattice entangled states is found
+comparable to or larger than the exchange interactions, suggesting the presence
+of Jahn-Teller dynamics in the systems. In Ba$_2$YMoO$_6$, the pseudo JT
+coupling enhances the mixing of the ground and excited spin-orbit multiplet
+states, which results in strong temperature dependence of effective magnetic
+moments. The entanglement of the spin and lattice degrees of freedom induces a
+strong magneto-elastic response. This multiferroic effect is at the origin of
+the recently reported breaking of local point symmetry accompanying the
+development of magnetic ordering in Ba$_2$NaOsO$_6$.",1803.06945v3
+2020-05-22,Swapping Exchange and Spin-Orbit Coupling in 2D van der Waals Heterostructures,"The concept of swapping the two most important spin interactions -- exchange
+and spin-orbit coupling -- is proposed based on two-dimensional multilayer van
+der Waals heterostructures. Specifically, we show by performing realistic ab
+initio simulations, that a single device consisting of a bilayer graphene
+sandwiched by a 2D ferromagnet Cr$_2$Ge$_2$Te$_6$ (CGT) and a monolayer WS$_2$,
+is able not only to generate, but also to swap the two interactions. The highly
+efficient swapping is enabled by the interplay of gate-dependent layer
+polarization in bilayer graphene and short-range spin-orbit and exchange
+proximity effects affecting only the layers in contact with the sandwiching
+materials. We call these structures ex-so-tic, for supplying either exchange
+(ex) or spin-orbit (so) coupling in a single device, by gating. Such
+bifunctional devices demonstrate the potential of van der Waals spintronics
+engineering using 2D crystal multilayers.",2005.11058v2
+2021-12-17,Triplet character of 2D-fermion dimers arising from $s$-wave attraction via spin-orbit coupling and Zeeman splitting,"We theoretically study spin-$1/2$ fermions confined to two spatial dimensions
+and experiencing isotropic short-range attraction in the presence of both
+spin-orbit coupling and Zeeman spin splitting - a prototypical system for
+developing topological superfluidity in the many-body sector. Exact solutions
+for two-particle bound states are found to have a triplet contribution that
+dominates over the singlet part in an extended region of parameter space where
+the combined Zeeman- and center-of-mass-motion-induced spin-splitting energy is
+large. The triplet character of dimers is purest in the regime of weak $s$-wave
+interaction strength. Center-of-mass momentum is one of the parameters
+determining the existence of bound states, which we map out for both two- and
+one-dimensional types of spin-orbit coupling. Distinctive features emerging in
+the orbital part of the bound-state wave function, including but not limited to
+its $p$-wave character, provide observable signatures of unconventional
+pairing.",2112.09336v2
+2022-01-25,Moiré Engineering of Spin-Orbit Coupling in Twisted Platinum Diselenide,"We study the electronic structure and correlated phases of twisted bilayers
+of platinum diselenide using large-scale ab initio simulations combined with
+the functional renormalization group. PtSe$_2$ is a group-X transition metal
+dichalcogenide, which hosts emergent flat bands at small twist angles in the
+twisted bilayer. Remarkably, we find that moir\'e engineering can be used to
+tune the strength of Rashba spin-orbit interactions, altering the electronic
+behavior in a novel manner. We reveal that an effective triangular lattice with
+a twist-controlled ratio between kinetic and spin-orbit coupling scales can be
+realized. Even dominant spin-orbit coupling can be accessed in this way and we
+discuss consequences for the interaction driven phase diagram, which features
+pronounced exotic superconducting and entangled spin-charge density waves.",2201.10615v1
+2015-04-20,Orbital-lattice coupling and orbital ordering instability in iron pnictides,"Orbital-ordering instability arising due to the intrapocket nesting is
+investigated for the tight-binding models of pnictides in the presence of
+orbital-lattice coupling. The incommensurate instabilities with small momentum,
+which may play an important role in the nematic-ordering transition, vary from
+model to model besides being more favorable in comparison to the spin-density
+wave instability in the absence of good interpocket nesting. We also examine
+the doping dependence of such instabilities. The electron-phonon coupling
+parameter required to induce them are compared with the first-principle
+calculations.",1504.04915v1
+2013-08-19,Vibronic Excitation Dynamics in Orbitally Degenerate Correlated Electron System,"Orbital-lattice coupled excitation dynamics in orbitally degenerate
+correlated systems are examined. We present a theoretical framework, where both
+local vibronic excitations and superexchange-type inter-site interactions are
+dealt with on an equal footing. We generalize the spin-wave approximation so as
+to take local vibronic states into account. Present method is valid from weak
+to strong Jahn-Teller coupling magnitudes. Two characteristic excitation modes
+coexist; a low-energy dispersive mode and high-energy multi-peak mode. These
+are identified as a collective vibronic mode, and Flanck-Condon excitations in
+a single Jahn-Teller center modified by the inter-site interactions,
+respectively. Present formalism covers vibronic dynamics in several
+orbital-lattice coupled systems.",1308.3997v1
+2017-04-20,Orbital and spin ordering physics of the Mn$_3$O$_4$ spinel,"Motivated by recent experiments, we present a comprehensive theoretical study
+of the geometrically frustrated strongly correlated magnetic insulator
+Mn$_3$O$_4$ spinel oxide based on a microscopic Hamiltonian involving lattice,
+spin and orbital degrees of freedom. Possessing the physics of degenerate e$_g$
+orbitals, this system shows a strong Jahn-Teller effect at high temperatures.
+Further, careful attention is paid to the special nature of the superexchange
+physics arising from the 90$^o$ Mn-O-Mn bonding angle. The Jahn-Teller and
+superexchange-based orbital-spin Hamiltonians are then analysed in order to
+track the dynamics of orbital and spin ordering. We find that a
+high-temperature structural transition results in orbital ordering whose nature
+is mixed with respect to the two originally degenerate $e_{g}$ orbitals. This
+ordering of orbitals is shown to relieve the intrinsic geometric frustration of
+the spins on the spinel lattice, leading to ferrimagnetic Yafet-Kittel ordering
+at low-temperatures. Finally, we develop a model for a magnetoelastic coupling
+in Mn$_3$O$_4$, enabling a systematic understanding of the experimentally
+observed complexity in the low-temperature structural and magnetic
+phenomenology of this spinel. Our analysis predicts that a quantum
+fluctuation-driven orbital-spin liquid phase may be stabilised at low
+temperatures upon the application of pressure.",1704.06026v1
+2013-07-17,Spin-orbit interaction induced spin selective transmission through a multi-terminal mesoscopic ring,"Spin dependent transport in a multi-terminal mesoscopic ring is investigated
+in presence of Rashba and Dresselhaus spin-orbit interactions. Within a
+tight-binding framework we use a general spin density matrix formalism to
+evaluate all three components ($P_x$, $P_y$ and $P_z$) of the polarization
+vector associated with the charge current through the outgoing leads. It
+explores the dynamics of the spin polarization vector of current propagating
+through the system subjected to the Rashba and/or the Dresselhaus spin-orbit
+couplings. The sensitivity of the polarization components on the electrode-ring
+interface geometry is discussed in detail. Our present analysis provides an
+understanding of the coupled spin and electron transport in mesoscopic bridge
+systems.",1307.4506v2
+2014-04-05,Effect of boundary scattering on spin-hall effect,"The spin dependent reflection in quasi-two-dimensional electron gas from an
+impenetrable barrier in presence of Rashba and Dresselhaus spin-orbit coupling
+is analyzed in detail. It is shown that due to spin-orbit effects the reflected
+beam split in two beams gives rise to multiple reflection analogous to
+phenomena birefringence. The interplay between Rashba and Dresselhaus
+spin-orbit coupling gives rise to anisotropy in Fermi energy surface and a
+non-zero net spin-polarized current oscillating with two frequencies for all
+the values of incident angle except at $45^{o}$ when averaged over all
+components of reflected beam. It is also shown that in over critical region,
+all the three polarization components as well as net polarization has non-zero
+values and are exponentially decaying as distance from the barrier increases
+which in turns spin-accumulation near the barrier is an important consequence
+of spin-hall effect.",1404.1453v2
+2015-11-13,Magnified Damping under Rashba Spin Orbit Coupling,"The spin orbit coupling spin torque consists of the field-like [REF: S.G. Tan
+et al., arXiv:0705.3502, (2007).] and the damping-like terms [REF: H.
+Kurebayashi et al., Nature Nanotechnology 9, 211 (2014).] that have been widely
+studied for applications in magnetic memory. We focus, in this article, not on
+the spin orbit effect producing the above spin torques, but on its magnifying
+the damping constant of all field like spin torques. As first order precession
+leads to second order damping, the Rashba constant is naturally co-opted,
+producing a magnified field-like damping effect. The Landau-Liftshitz-Gilbert
+equations are written separately for the local magnetization and the itinerant
+spin, allowing the progression of magnetization to be self-consistently locked
+to the spin.",1511.04227v1
+2016-10-05,Prominent role of spin-orbit coupling in FeSe,"In most existing theories for iron-based superconductors, spin-orbit coupling
+(SOC) has been assumed insignificant. Even though recent experiments have
+revealed an influence of SOC on the electronic band structure, whether SOC
+fundamentally affects magnetism and superconductivity remains an open question.
+Here we use spin-polarised inelastic neutron scattering to show that collective
+low-energy spin fluctuations in the orthorhombic (or ""nematic"") phase of FeSe
+possess nearly no in-plane component. Such spin-space anisotropy can only be
+caused by SOC. It is present over an energy range greater than the
+superconducting gap 2$\Delta _\mathrm{sc}$ and gets fully inherited in the
+superconducting state, resulting in a distinct $c$-axis polarised ""spin
+resonance"". Our result demonstrates the importance of SOC in defining the
+low-energy spin excitations in FeSe, which helps to elucidate the nearby
+magnetic instabilities and the debated interplay between spin and orbital
+degrees of freedom. The prominent role of SOC also implies a possible unusual
+nature of the superconducting state.",1610.01277v1
+2020-07-28,Spin and charge distributions in Graphene/Nickel (111) substrate under Rashba spin-orbital coupling,"To understand the coupling factor between Rashba spin-orbital interaction and
+ferromagnetic proximity effect, we design a Monte Carlo algorithm to simulate
+the spin and charge distributions for the room-temperature Rashba material,
+Graphene/Nickel(111) substrate, at finite temperature. We observe that the rate
+of exchange fluctuation is a key player to produce giant Rashba spin-orbit
+splitting in graphene. More importantly, we monitor the Rashba spin-splitting
+phenomenon where the spin-polarized electrons may be escaped from two opposite
+edges upon heating. However, the escaped electrons show Gaussian-like
+distribution in interior area that is important for spintronic engineers to
+optimize the efficiency of spin-state detection. In addition, we investigate if
+our Monte Carlo model can explain why room-temperature Rashba effect is
+observed in Graphene/Nickel(111) substrate experimentally. All results are
+presented in physical units.",2007.14060v1
+2011-11-02,The influence of anisotropic gate potentials on the phonon induced spin-flip rate in GaAs quantum dots,"We study the anisotropic orbital effect in the electric field tunability of
+the phonon induced spin-flip rate in quantum dots (QDs). Our study shows that
+anisotropic gate potential enhances the spin-flip rate and reduces the level
+crossing point to a lower quantum dot radius due to the suppression of the
+Land$\acute{e}$ g-factor towards bulk crystal. In the range of $10^4-10^6$
+V/cm, the electric field tunability of the phonon induced spin-flip rate can be
+manipulated through strong Dresselhaus spin-orbit coupling. These results might
+assist the development of a spin based solid state quantum computer by
+manipulating phonon induced spin-flip rate through spin-orbit coupling with the
+application of anisotropic gate potential in a regime where the g-factor
+changes its sign.",1111.0558v2
+2014-06-14,Electric-field coupling to spin waves in a centrosymmetric ferrite,"We experimentally demonstrate that the spin-orbit interaction can be utilized
+for direct electric-field tuning of the propagation of spin waves in a
+single-crystal yttrium iron garnet magnonic waveguide. Magnetoelectric coupling
+not due to the spin-orbit interaction, and hence an order of magnitude weaker,
+leads to electric-field modification of the spin-wave velocity for waveguide
+geometries where the spin-orbit interaction will not contribute. A theory of
+the phase shift, validated by the experiment data, shows that, in the exchange
+spin wave regime, this electric tuning can have high efficiency. Our findings
+point to an important avenue for manipulating spin waves and developing
+electrically tunable magnonic devices.",1406.3675v1
+2018-01-17,Exploring Hidden Acoustic Spin Underwater,"Investigating wave propagation in fluid enables a variety of important
+applications in underwater communications, object detections and unmanned robot
+control. Conventionally, momentum and spin reveal fundamental physical
+properties about propagating waves. Yet, vast previous research focused on the
+orbital angular momentum of acoustics without thinking about the existence
+possibility of spin due to the longitudinal wave nature. Here, we show that
+underwater acoustic wave processes the non-trivial spin angular momentum
+intrinsically, which is associated with its special spin-orbital coupling
+relation for longitudinal waves. Furthermore, we demonstrate that this
+intrinsic spin, although unobservable in plane wave form, can be detected by
+four approaches: wave interference, Gaussian exponential decay form, boundary
+evanescent wave, and waveguide mode. We further show that the strong
+spin-orbital coupling can be exploited to achieve unidirectional excitation and
+backscattering immune transport. We hope the present results can improve the
+geometric and topological understanding about underwater acoustic wave and pave
+the way on the spin-related underwater applications.",1801.05790v2
+2019-06-15,Spin-orbit driven spin depolarization in the ferromagnetic Weyl semimetal Co3Sn2S2,"Co$_3$Sn$_2$S$_2$ has recently emerged as a ferromagnetic Weyl semi-metal.
+Theoretical investigation of the spin-split bands predicted half metalicity in
+the compound. Here, we report the detection of a spin polarized supercurrent
+through a Nb/Co$_3$Sn$_2$S$_2$ point contact where Andreev reflection is seen
+to be large indicating a large deviation from half metallicity. In fact,
+analysis of the Andreev reflection spectra reveals only 50\% spin polarization
+at the Fermi level of Co$_3$Sn$_2$S$_2$. Our theoretical calculations of
+electronic Density of States (DOS) reveal a spin depolarizing effect near the
+Fermi energy when the role of spin-orbit coupling is included. Inclusion of
+spin-orbit coupling also reveals particle-hole asymmetry that explains a large
+asymmetry observed in our experimental Andreev reflection spectra.",1906.06557v1
+2006-08-10,Universal spin-Hall conductance fluctuations in two dimensions,"We report a theoretical investigation on spin-Hall conductance fluctuation of
+disordered four terminal devices in the presence of Rashba or/and Dresselhaus
+spin-orbital interactions in two dimensions. As a function of disorder, the
+spin-Hall conductance $G_{sH}$ shows ballistic, diffusive and insulating
+transport regimes. For given spin-orbit interactions, a universal spin-Hall
+conductance fluctuation (USCF) is found in the diffusive regime. The value of
+the USCF depends on the spin-orbit coupling $t_{so}$, but is independent of
+other system parameters. It is also independent of whether Rashba or
+Dresselhaus or both spin-orbital interactions are present. When $t_{so}$ is
+comparable to the hopping energy $t$, the USCF is a universal number $\sim 0.18
+e/4\pi$. The distribution of $G_{sH}$ crosses over from a Gaussian distribution
+in the metallic regime to a non-Gaussian distribution in the insulating regime
+as the disorder strength is increased.",0608240v1
+2017-11-29,Spin-orbit torque in 3D topological insulator-ferromagnet heterostructure: crossover between bulk and surface transport,"Current-driven spin-orbit torques are investigated in a heterostructure
+composed of a ferromagnet deposited on top of a three dimensional topological
+insulator using the linear response formalism. We develop a tight-binding model
+of the heterostructure adopting a minimal interfacial hybridization scheme that
+promotes induced magnetic exchange on the topological surface states, as well
+as induced Rashba-like spin-orbit coupling in the ferromagnet. Therefore, our
+model accounts for spin Hall effect from bulk states together with inverse spin
+galvanic and magnetoelectric effects at the interface on equal footing. By
+varying the transport energy across the band structure, we uncover a crossover
+from surface-dominated to bulk-dominated transport regimes. We show that the
+spin density profile and the nature of the spin-orbit torques differ
+substantially in both regimes. Our results, which compare favorably with
+experimental observations, demonstrate that the large damping torque reported
+recently is more likely attributed to interfacial magnetoelectric effect, while
+spin Hall torque remains small even in the bulk-dominated regime.",1711.11016v2
+2021-03-29,Spin Dynamics of Extrasolar Giant Planets in Planet-Planet Scattering,"Planet-planet scattering best explains the eccentricity distribution of
+extrasolar giant planets. Past literature showed that the orbits of planets
+evolve due to planet-planet scattering. This work studies the spin evolution of
+planets in planet-planet scattering in 2-planet systems. Spin can evolve
+dramatically due to spin-orbit coupling made possible by the evolving spin and
+orbital precession during the planet-planet scattering phase. The main source
+of torque to planet spin is the stellar torque, and the total planet-plane
+torque contribution is negligible. As a consequence of the evolution of the
+spin, planets can end up with significant obliquity (the angle between a
+planet's own orbit normal and spin axis) like planets in our Solar System.",2103.15902v1
+2021-07-16,Spinning test particle motion around a traversable wormhole,"The motion of spinning test particles around a traversable wormhole is
+investigated using the Mathisson Papapetrous Dixon equations, which couple the
+Riemann tensor with the antisymmetric tensor $S^{ab}$, related to the spin of
+the particle. Hence, we study the effective potential, circular orbits, and
+innermost stable circular orbit ISCO of spinning particles. We found that the
+spin affects significantly the location of the ISCO, in contrast with the
+motion of nonspinning particles, where the ISCO is the same in both the upper
+and lower universes. On the other hand, since the dynamical fourmomentum and
+kinematical fourvelocity of the spinning particle are not always parallel, we
+also consider a superluminal bound on the particles motion. In the case of
+circular orbits at the ISCO, we found that the motion of particles with an
+adimensional spin parameter lower greater than $s=-1.5$ $(1.5)$ is forbidden.
+The spin interaction becomes important for Kerr black hole orbiting super
+massive wormholes SMWH.",2107.07998v1
+2005-06-07,Dependence of the intrinsic spin Hall effect on spin-orbit interaction character,"We report on a comparative numerical study of the spin Hall conductivity in
+two-dimensions for three different spin-orbit interaction models; the standard
+k-linear Rashba model, the k-cubic Rashba model that describes two-dimensional
+hole systems, and a modified k-linear Rashba model in which the spin-orbit
+coupling strength is energy dependent. Numerical finite-size Kubo formula
+results indicate that the spin Hall conductivity of the k-linear Rashba model
+vanishes for frequency $\omega$ much smaller than the scattering rate
+$\tau^{-1}$, with order one relative fluctuations surviving out to large system
+sizes. For the k-cubic Rashba model case, the spin Hall conductivity does not
+depend noticeably on $\omega \tau$ and is finite in the {\em dc} limit, in
+agreement with experiment. For the modified k-linear Rashba model the spin Hall
+conductivity is noticeably $\omega \tau$ dependent but approaches a finite
+value in the {\em dc} limit. We discuss these results in the light of a
+spectral decomposition of the spin Hall conductivity and associated sum rules,
+and in relation to a proposed separation of the spin Hall conductivity into
+skew-scattering, intrinsic, and interband vertex correction contributions.",0506189v1
+2007-07-06,Mesoscopic spin confinement during acoustically induced transport,"Long coherence lifetimes of electron spins transported using moving potential
+dots are shown to result from the mesoscopic confinement of the spin vector.
+The confinement dimensions required for spin control are governed by the
+characteristic spin-orbit length of the electron spins, which must be larger
+than the dimensions of the dot potential. We show that the coherence lifetime
+of the electron spins is independent of the local carrier densities within each
+potential dot and that the precession frequency, which is determined by the
+Dresselhaus contribution to the spin-orbit coupling, can be modified by varying
+the sample dimensions resulting in predictable changes in the spin-orbit length
+and, consequently, in the spin coherence lifetime.",0707.1047v1
+2017-06-01,Current-induced spin polarization in InGaAs and GaAs epilayers with varying doping densities,"The current-induced spin polarization and momentum-dependent spin-orbit field
+were measured in In$_{x}$Ga$_{1-x}$As epilayers with varying indium
+concentrations and silicon doping densities. Samples with higher indium
+concentrations and carrier concentrations and lower mobilities were found to
+have larger electrical spin generation efficiencies. Furthermore,
+current-induced spin polarization was detected in GaAs epilayers despite the
+absence of measurable spin-orbit fields, indicating that the extrinsic
+contributions to the spin polarization mechanism must be considered.
+Theoretical calculations based on a model that includes extrinsic contributions
+to the spin dephasing and the spin Hall effect, in addition to the intrinsic
+Rashba and Dresselhaus spin-orbit coupling, are found to qualitatively agree
+with the experimental results.",1706.00351v1
+2020-02-28,Spin-orbit torques driven by the interface-generated spin currents,"The spin currents generated by spin-orbit coupling (SOC) in the nonmagnetic
+metal layer or at the interface with broken inversion symmetry are of
+particular interest and importance. Here, we have explored the spin current
+generation mechanisms through the spin-orbit torques (SOTs) measurements in the
+Ru/Fe heterostructures with weak perpendicular magnetic anisotropy (PMA).
+Although the spin Hall angle (SHA) of Ru is smaller than that in Pt, Ta or W,
+reversible SOT in Ru/Fe heterostructures can still be realized. Through
+non-adiabatic harmonic Hall voltage measurements and macrospin simulation, the
+effective SHA in Ru/Fe heterostructures is compared with Pt. Moreover, we also
+explore that the spin current driven by interface strongly depends on the
+electrical conductivities. Our results suggest a new method for efficiently
+generating finite spin currents in ferromagnet/nonmagnetic metal bilayers,
+which establishes new opportunities for fundamental study of spin dynamics and
+transport in ferromagnetic systems.",2002.12545v1
+2023-06-15,Transverse spin-orbit interaction of light,"Light carries both longitudinal and transverse spin angular momentum. The
+spin can couple with its orbital counterpart via the Berry phase, known as the
+spin-orbit interaction (SOI) of light. The SOI of light discovered previously
+belongs to the longitudinal one, which relies on the Berry phase in momentum
+space, such as the optical Magnus effect and the spin Hall effect. Here, we
+show that transverse SOI, relying on the Berry phase in real space, is inherent
+in the Helmholtz equation when transverse spinning light propagates in curved
+paths. The transverse SOI lifts the degeneracy of dispersion relations of light
+for opposite transverse spin states, analogous to the Dresselhaus effect.
+Transverse SOI is ubiquitous in nanophotonic systems where transverse spin and
+optical path bending are inevitable. It can also explain anomalous effects like
+the dispersion relation of surface plasmon polariton on curved paths and the
+energy level of whispering gallery modes. Our results reveal the analogies of
+spin photonics and spintronics and offer a new degree of freedom for integrated
+photonics, spin photonics, and astrophysics.",2306.08975v1
+2004-09-25,Competing effects of interactions and spin-orbit coupling in a quantum wire,"We study the interplay of electron-electron interactions and Rashba
+spin-orbit coupling in one-dimensional ballistic wires. Using the
+renormalization group approach we construct the phase diagram in terms of
+Rashba coupling, Tomonaga-Luttinger stiffness and backward scattering strength.
+We identify the parameter regimes with a dynamically generated spin gap and
+show where the Luttinger liquid prevails. We also discuss the consequences for
+the operation of the Datta-Das transistor.",0409678v2
+2013-07-05,Unconventional superfluidity in quasi-one-dimensional systems,"We show that an unconventional superfluid triggered by spin-orbit coupling is
+realized for repulsively interacting quasi-one-dimensional fermions. A
+competition between spin-singlet and -triplet pairings occurs due to the
+breaking of inversion symmetry. We show that both superfluid correlations decay
+algebraically with the same exponent except for special coupling constants for
+which a dominant superfluid is controlled by the spin-orbit coupling. We also
+discuss a possible experiment to observe such phases with cold atoms.",1307.1639v2
+2016-07-25,Spin-orbit-coupling-induced magnetic heterostructure in the bilayer Bose-Hubbard system,"We investigate magnetic phase in the bilayer system of ultra-cold bosons in
+an optical lattice, which is involved with Raman-induced spin-orbit (SO)
+coupling and laser-assisted interlayer tunneling. It is shown that there exit a
+rich of spin textures such as hetero ferromagnet, heterochiral magnet, chiral
+magnet with interlayer antiferromagnet. In particular, heterochiral magnet
+induced by SO coupling occurs extremely rarely in real solid-state materials.
+We present detailed experimental setup of realizing such a model in cold atom
+system.",1607.07336v1
+2017-08-30,Two-dimensional Rashba metals: unconventional low-temperature transport properties,"Rashba spin-orbit coupling emerges in materials lacking of structural
+inversion symmetry, such as heterostructures, quantum wells, surface alloys and
+polar materials, just to mention few examples. It yields a coupling between the
+spin and momentum of electrons formally identical to that arising from the
+weakly-relativistic limit of the Dirac equation. The purpose of the present
+work is to give an overview of the unconventional dc transport properties of
+two-dimensional metals with strong Rashba spin-orbit coupling, discussing in
+addition the effects of thermal broadening.",1708.09331v1
+2013-08-07,Calculation of Multipolar Exchange Interactions in Spin-Orbital Coupled Systems,"A new method of computing multipolar exchange interaction in spin-orbit
+coupled systems is developed using multipolar tensor expansion of the density
+matrix in LDA+U electronic structure calculation. Within mean-field
+approximation, exchange constants can be mapped into a series of total energy
+calculations by pair-flip technique. Application to Uranium dioxide shows an
+antiferromagnetic superexchange coupling in dipoles but ferromagnetic in
+quadrupoles which is very different from past studies. Further calculation of
+spin-lattice interaction indicates it is of the same order with superexchange
+and characterizes the overall behavior of quadrupolar part as a competition
+between them.",1308.1488v1
+2017-12-15,Pauli metallic ground-state in Hubbard clusters with Rashba spin-orbit coupling,"We study the ""phase diagram"" of a Hubbard plaquette with Rashba spin-orbit
+coupling. We show that the peculiar way in which Rashba coupling breaks the
+spin-rotational symmetry of the Hubbard model allows a mixing of singlet and
+triplet components in the ground-state that slows down and it changes the
+nature of the Mott transition and of the Mott insulating phases.",1712.05618v2
+2010-04-29,Computing waveforms for spinning compact binaries in quasi-eccentric orbits,"Several scenarios have been proposed in which the orbits of binary black
+holes enter the band of a gravitational wave detector with significant
+eccentricity. To avoid missing these signals or biasing parameter estimation it
+is important that we consider waveform models that account for eccentricity.
+The ingredients needed to compute post-Newtonian (PN) waveforms produced by
+spinning black holes inspiralling on quasi-eccentric orbits have been available
+for almost two decades at 2 PN order, and this work has recently been extended
+to 2.5 PN order. However, the computational cost of directly implementing these
+waveforms is high, requiring many steps per orbit to evolve the system of
+coupled differential equations. Here we employ the standard techniques of a
+separation of timescales and a generalized Keplerian parameterization of the
+orbits to produce efficient waveforms describing spinning black hole binaries
+with arbitrary masses and spins on quasi-eccentric orbits to 1.5 PN order. We
+separate the fast orbital timescale from the slow spin-orbit precession
+timescale by solving for the orbital motion in a non-interial frame of
+reference that follows the orbital precession. We outline a scheme for
+extending our approach to higher post-Newtonian order.",1004.5322v4
+1998-09-14,Small-$q$ Anomaly in the Dielectric Function and High-Temperature Oscillations of Screening Potential in 2D Electron Gas with Spin-Orbit Coupling,"We study the static dielectric function $\epsilon(q)$ of 2D electron system
+with spin-orbit coupling in the frame of the random phase approximation. We
+demonstrate that, in addition to the well-known $2k_F$-Kohn anomaly, spin-orbit
+coupling gives rise to the novel anomaly in the dielectric function at small
+$q=q_0\ll k_F$, where $q_0$ is the distance between two Fermi surfaces. As a
+result of this anomaly a large-distance behavior of the potential from a point
+charge exhibits (in addition to the conventional Friedel oscillations) novel
+oscillations with a period $2\pi/q_0$. The remarkable feature of these
+oscillations is that they are not smeared out by the temperature. We show that
+the small-$q$ anomaly also modifies the indirect exchange interaction of
+localized magnetic moments (RKKY interaction). In the presense of spin-orbit
+coupling this interaction acquires a high-temperature component.",9809207v1
+2000-05-29,Electronic and Magnetic Properties of Febr2,"Electronic and magnetic (e-m) properties of FeBr2 have been surprisingly well
+described as originating from the Fe2+ ions and their fine electronic
+structure. The fine electronic structure have been evaluated taking into
+account the spin-orbit (s-o) coupling, crystal-field and inter-site
+spin-dependent interactions. The required magnetic doublet ground state with an
+excited singlet at D=2.8 meV results from the trigonal distortion. This effect
+of the trigonal distortion and a large magnetic moment of iron, of 4.4 mB, can
+be theoretically derived provided the s-o coupling is correctly taking into
+account. The obtained good agreement with experimental data indicates on
+extremaly strong correlations of the six 3d electrons in the Fe2+ ion yielding
+their full localization and the insulating state. These calculations show that
+for the meaningful analysis of e-m properties of FeBr2 the spin-orbit coupling
+is essentially important and that the orbital moment (0.74 mB) is largely
+unquenched (by the off-cubic trigonal distortion in the presence of the
+spin-orbit coupling).",0005502v1
+2005-02-18,Rashba effect in quantum networks,"We present a formalism to study quantum networks made up by single-channel
+quantum wires in the presence of Rashba spin-orbit coupling and magnetic field.
+In particular, linear transport through one-dimensional and two-dimensional
+finite-size networks is studied by means of the scattering formalism. In some
+particular quantum networks, the action of the magnetic field or of the Rashba
+spin-orbit coupling induces localization of the electron wave function. This
+phenomenon, which relies on both the quantum-mechanical interference and the
+geometry of the network, is manifested through the suppression of the
+conductance for specific values of the spin-orbit-coupling strength or of the
+magnetic field. Furthermore, the interplay of the Aharonov-Bohm phases and of
+the non-Abelian phases introduced by spin-orbit coupling, is discussed in a
+number of cases.",0502455v2
+2005-09-07,Energy levels and magneto-optical transitions in parabolic quantum dots with spin-orbit coupling,"We report on the electronic properties of few interacting electrons confined
+in a parabolic quantum dot based on a theoretical approach developed to
+investigate the influence of Bychkov-Rashba spin-orbit (SO) interaction on such
+a system. We note that the spin-orbit coupling profoundly influences the energy
+spectrum of interacting electrons in a quantum dot. Here we present accurate
+results for the energy levels and optical-absorption spectra for parabolic
+quantum dots containing upto four interacting electrons, in the presence of
+spin-orbit coupling and under the influence of an externally applied,
+perpendicular magnetic field. We have described in detail about a very accurate
+numerical scheme to evaluate these quantities. We have evaluated the effects of
+SO coupling on the Fock-Darwin spectra for quantum dots made out of three
+different semiconductor systems, InAs, InSb, and GaAs.",0509170v1
+2005-10-25,Intrinsically s-wave like property of triplet superconductors with spin-orbit coupling,"We have studied a general property of unconventional superconductors with
+spin-orbit coupling by solving the Bogoliubov-de Gennes equation and found that
+the two of four eigenfunctions for triplet pairing coincide with those for
+s-wave pairing when a relation holds between pairing symmetry and spin-orbit
+coupling, indicative of an intrinsically s-wave like property of triplet
+superconductors. Applying the result, we have studied the tunneling conductance
+in normal metal / insulator / unconventional superconductor junctions with a
+candidate of pairing symmetry of CePt$_3$Si. The effect of Rashba spin-orbit
+coupling (RSOC) is taken into account. We have found that the RSOC induces a
+peak at the energy gap like s-wave superconductors in the tunneling spectrum.",0510659v1
+2006-05-08,Large Bychkov-Rashba spin-orbit coupling in high-mobility GaN/AlGaN heterostructures,"We present low temperature magnetoconductivity measurements of a
+density-tunable and high mobility two-dimensional electron gas confined in the
+wide bandgap GaN/AlGaN system. We observed pronounced anti-localization minima
+in the low-field conductivity, indicating the presence of strong spin-orbit
+coupling. Density dependent measurements of magnetoconductivity indicate that
+the coupling is mainly due to the Bychkov-Rashba mechanism. In addition, we
+have derived a closed-form expression for the magnetoconductivity, allowing us
+to extract reliable transport parameters for our devices. The Rashba spin-orbit
+coupling constant is $\alpha_{so}$ $\sim$ 6$\times$ 10$^{-13}$eVm, while the
+conduction band spin-orbit splitting energy amounts to $\Delta_{so}$ $\sim$
+0.3meV at n$_e$=1$\times10^{16}$m$^{-2}$.",0605155v1
+2007-09-19,Splitting of Andreev levels in a Josephson junction by spin-orbit coupling,"We consider the effect of spin-orbit coupling on the energy levels of a
+single-channel Josephson junction below the superconducting gap. We investigate
+quantitatively the level splitting arising from the combined effect of
+spin-orbit coupling and the time-reversal symmetry breaking by the phase
+difference between the superconductors. Using the scattering matrix approach we
+establish a simple connection between the quantum mechanical time delay matrix
+and the effective Hamiltonian for the level splitting. As an application we
+calculate the distribution of level splittings for an ensemble of chaotic
+Josephson junctions. The distribution falls off as a power law for large
+splittings, unlike the exponentially decaying splitting distribution given by
+the Wigner surmise -- which applies for normal chaotic quantum dots with
+spin-orbit coupling in the case that the time-reversal symmetry breaking is due
+to a magnetic field.",0709.3054v1
+2007-11-14,$Σ$-nuclear spin-orbit coupling from two-pion exchange,"Using SU(3) chiral perturbation theory we calculate the density-dependent
+complex-valued spin-orbit coupling strength $U_{\Sigma ls}(k_f)+ i W_{\Sigma
+ls}(k_f)$ of a $\Sigma$ hyperon in the nuclear medium. The leading long-range
+$\Sigma N$ interaction arises from iterated one-pion exchange with a $\Lambda$
+or a $\Sigma$ hyperon in the intermediate state. We find from this unique
+long-range dynamics a sizeable ``wrong-sign'' spin-orbit coupling strength of
+$U_{\Sigma ls}(k_{f0}) \simeq -20$ MeVfm$^2$ at normal nuclear matter density
+$\rho_0 = 0.16 $fm$^{-3}$. The strong $\Sigma N\to \Lambda N$ conversion
+process contributes at the same time an imaginary part of $W_{\Sigma
+ls}(k_{f0}) \simeq -12$ MeVfm$^2$. When combined with estimates of the
+short-range contribution the total $\Sigma$-nuclear spin-orbit coupling becomes
+rather weak.",0711.2237v1
+2009-04-02,Few-electron physics in a nanotube quantum dot with spin-orbit coupling,"We study the few-electron eigenspectrum of a nanotube quantum dot with
+spin-orbit coupling. The two-electron phase diagram as a function of the length
+of the dot and the applied parallel magnetic field shows clear signatures of
+both spin-orbit coupling and electron-electron interaction. Below a certain
+critical length, ground state transitions are correctly predicted by a
+single-particle picture and are mainly independent of the length of the dot
+despite the presence of strong correlations. However, for longer quantum dots
+the critical magnetic field strongly decreases with increasing length, which is
+a pure interaction effect. In fact, the new ground state is spin- and
+valley-polarized, which implies a strong occupation of higher longitudinal
+modes.",0904.0445v2
+2010-06-04,The effect of spin-orbit interaction and attractive Coulomb potential on the magnetic properties of Ga$_{1-x}$Mn$_{x}$As,"We employ the dynamical mean-field approximation to study the magnetic
+properties of a model relevant for the dilute magnetic semiconductors. Our
+model includes the spin-orbit coupling on the hole bands, the exchange
+interaction, and the attractive Coulomb potential between the negatively
+charged magnetic ions and the itinerant holes. The inclusion of the Coulomb
+potential significantly renormalizes the exchange coupling and enhances the
+ferromagnetic transition temperature for a wide range of couplings. We also
+explore the effect of the spin-orbit interaction by using two different values
+of the ratio of the effective masses of the heavy and light holes. We show that
+in the regime of small $J_{c}$-$V$ the spin-orbit interaction enhances $T_{c}$,
+while for large enough values of $J_{c}$-$V$ magnetic frustration reduces $T_c$
+to values comparable to the previously calculated strong coupling limit.",1006.0998v2
+2010-07-18,Robustness of Majorana Modes and Minigaps in a Spin-Orbit-Coupled Semiconductor-Superconductor Heterostructure,"We study the robustness of Majorana zero energy modes and minigaps of
+quasiparticle excitations in a vortex by numerically solving
+Bogoliubov-deGennes equations in a heterostructure composed of an \textit{s}
+-wave superconductor, a spin-orbit-coupled semiconductor thin film, and a
+magnetic insulator. This heterostructure was proposed recently as a platform
+for observing non-Abelian statistics and performing topological quantum
+computation. The dependence of the Majorana zero energy states and the minigaps
+on various physics parameters (Zeeman field, chemical potential, spin-orbit
+coupling strength) is characterized. We find the minigaps depend strongly on
+the spin-orbit coupling strength. In certain parameter region, the minigaps are
+linearly proportional to the \textit{s}-wave superconducting pairing gap
+$\Delta_{s}$, which is very different from the $\Delta_{s}^{2}$ dependence in a
+regular \textit{s-} or \textit{\p}-wave superconductor. We characterize the
+zero energy chiral edge state at the boundary and calculate the STM signal in
+the vortex core that shows a pronounced zero energy peak. We show that the
+Majorana zero energy states are robust in the presence of various types of
+impurities. We find the existence of impurity potential may increase the
+minigaps and thus benefit topological quantum computation.",1007.2972v2
+2011-03-01,Two-orbital Kondo effect in quantum dot coupled to ferromagnetic leads,"We study the Kondo effect of a two-orbital vertical quantum dot (QD) coupled
+to two ferromagnetic leads by employing an equation of motion method. When the
+ferromagnetic leads are coupled with parallel spin polarization, we find three
+peaks in the single-particle excitation spectra. The middle one is the Kondo
+resonance caused by the orbital degrees of freedom. In magnetic fields, the
+Kondo effect vanishes. However, at a certain magnetic field new two-fold
+degenerate states arise and the Kondo effect emerges there. In contrast, when
+the ferromagnetic leads are coupled with antiparallel spin polarization, the
+Kondo effect caused by the spin (orbital) degrees of freedom survives (is
+suppressed) in magnetic fields. We investigate the field dependence of the
+conductance in the parallel and antiparallel spin polarizations of the leads
+and find that the conductance changes noticeably in magnetic fields.",1103.0304v2
+2011-05-11,Spin-Orbit Coupled Fermi Gases across a Feshbach Resonance,"In this letter we study both ground state properties and the superfluid
+transition temperature of a spin-1/2 Fermi gas across a Feshbach resonance with
+a synthetic spin-orbit coupling, using mean-field theory and exact solution of
+two-body problem. We show that a strong spin-orbit coupling can significantly
+enhance the pairing gap for 1/(k_F a_s)<=0 due to increased density-of-state.
+Strong spin-orbit coupling also significantly enhances the superfluid
+transition temperature when 1/(k_F a_s)<=0, while suppresses it slightly when
+1/(k_F a_s)>0. The universal interaction energy and pair size at resonance are
+also discussed.",1105.2250v3
+2011-05-28,Paired Superfluidity and Fractionalized Vortices in Spin-orbit Coupled Bosons,"In this letter we study finite temperature properties of spin-1/2 interacting
+bosons with spin-orbit coupling in two dimensions. When the ground state has
+stripe order, we show that thermal fluctuations will first melt the stripe
+order and lead to a superfluid of boson pairs if the spin-orbit coupling is
+isotropic or nearly isotropic. Such a phase supports fractionalized quantum
+vortices. The Kosterlize-Thouless transition from superfluid to normal state is
+driven by proliferation of half vortices. When the ground state is a plane wave
+state, the transition to normal state is driven by conventional
+Kosterlize-Thouless transition. However, the critical temperature will drop to
+zero for isotropic spin-orbit coupling.",1105.5700v1
+2011-08-22,Spin-orbit coupled weakly interacting Bose-Einstein condensates in harmonic traps,"We investigate theoretically the phase diagram of a spin-orbit coupled Bose
+gas in two-dimensional harmonic traps. We show that discrete Landau levels
+develop at strong spin-orbit coupling. For a weakly interacting gas, quantum
+states with skyrmion lattice patterns emerge spontaneously and preserve either
+parity symmetry or combined parity-time-reversal symmetry. These phases can be
+readily observed by experimentally engineering spin-orbit coupling and
+interatomic interactions for a cloud of $^{87}$Rb atoms in a highly oblate
+trap.",1108.4233v3
+2012-10-08,Momentum-resolved radio-frequency spectroscopy of a spin-orbit coupled atomic Fermi gas near a Feshbach resonance in harmonic traps,"We theoretically investigate the momentum-resolved radio-frequency
+spectroscopy of a harmonically trapped atomic Fermi gas near a Feshbach
+resonance in the presence of equal Rashba and Dresselhaus spin-orbit coupling.
+The system is qualitatively modeled as an ideal gas mixture of atoms and
+molecules, in which the properties of molecules, such as the wavefunction,
+binding energy and effective mass, are determined from the two-particle
+solution of two-interacting atoms. We calculate separately the radio-frequency
+response from atoms and molecules at finite temperatures by using the standard
+Fermi golden rule, and take into account the effect of harmonic traps within
+local density approximation. The total radio-frequency spectroscopy is
+discussed, as functions of temperature and spin-orbit coupling strength. Our
+results give a qualitative picture of radio-frequency spectroscopy of a
+resonantly interacting spin-orbit coupled Fermi gas and can be directly tested
+in atomic Fermi gases of K40 atoms at Shanxi University and of Li6 atoms at
+MIT.",1210.2160v2
+2012-12-17,Spectral Gaps of Spin-orbit Coupled Particles in Deformed Traps,"We consider a spin-orbit coupled system of particles in an external trap that
+is represented by a deformed harmonic oscillator potential. The spin-orbit
+interaction is a Rashba interaction that does not commute with the trapping
+potential and requires a full numerical treatment in order to obtain the
+spectrum. The effect of a Zeeman term is also considered. Our results
+demonstrate that variable spectral gaps occur as a function of strength of the
+Rashba interaction and deformation of the harmonic trapping potential. The
+single-particle density of states and the critical strength for superfluidity
+vary tremendously with the interaction parameter. The strong variations with
+Rashba coupling and deformation implies that the few- and many-body physics of
+spin-orbit coupled systems can be manipulated by variation of these parameters.",1212.4051v4
+2013-05-21,Ultracold collision in the presence of synthetic spin-orbit coupling,"We present an analytic description of ultracold collision between two
+spin-$\frac{1}{2}$ fermions with isotropic spin-orbit coupling of the Rashba
+type. We show that regardless of how weak the spin-orbit coupling may be, the
+ultracold collision at sufficiently low energies is significantly modified,
+including the ubiquitous Wigner threshold behavior. We further show that the
+particles are preferably scattered into the lower-energy helicity state due to
+the break of parity conservation, thus establishing interaction with spin-orbit
+coupling as one mechanism for the spontaneous emergence of handedness.",1305.4750v1
+2013-07-11,Unconventional Fulde-Ferrell-Larkin-Ovchinnikov pairing states in a Fermi gas with spin-orbit coupling,"We study the phase diagram in a two-dimensional Fermi gas with the synthetic
+spin-orbit coupling that has recently been realized experimentally. In
+particular, we characterize in detail the properties and the stability region
+of the unconventional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) states in such a
+system, which are induced by spin-orbit coupling and Fermi surface asymmetry.
+We identify several distinct nodal FFLO states by studying the topology of
+their respective gapless contours in momentum space. We then examine the phase
+structure and the number density distributions in a typical harmonic trapping
+potential under the local density approximation. Our studies provide detailed
+information on the FFLO pairing states with spin-orbit coupling and Fermi
+surface asymmetry, and will facilitate experimental detection of these
+interesting pairing states in the future.",1307.3117v1
+2014-04-24,Beating pattern in quantum magnetotransport coefficients of spin-orbit coupled Dirac fermions in gated silicene,"We report theoretical study of magnetotransport coefficients of spin-orbit
+coupled gated silicene in presence and absence of spatial periodic modulation.
+The combined effect of spin-orbit coupling and perpendicular electric field
+manifests through formation of regular beating pattern in Weiss and SdH
+oscillations. Analytical results, in addition to the numerical results, of the
+beating pattern formation are provided. The analytical results yield a beating
+condition which will be useful to determine the spin-orbit coupling constant by
+simply counting the number of oscillation between any two successive nodes.
+Moreover, the numerical results of modulation effect on collisional and Hall
+conductivities are presented.",1404.6188v1
+2014-10-30,Nonadiabatic multichannel dynamics of a spin-orbit coupled condensate,"We investigate the nonadiabatic dynamics of a driven spin-orbit-coupled
+Bose-Einstein condensate in both weak and strong driven force. It is shown that
+the standard Landau-Zener (LZ) tunneling fails in the regime of weak driven
+force and/or strong spin-orbital coupling, where the full nonadiabatic dynamics
+requires a new mechanism through multichannel effects. Beyond the semiclassical
+approach, our numerical and analytical results show an oscillating power-law
+decay in the quantum limit, different from the exponential decay in the
+semiclassical limit of the LZ effect. Furthermore, the condensate density
+profile is found to be dynamically fragmented by the multichannel effects and
+enhanced by interaction effects. Our work therefore provides a complete picture
+to understand the nonadiabatic dynamics of a spin-orbit coupled condensate,
+including various range of driven force and interaction effects through
+multichannel interference. The experimental indication of these nonadiabatic
+dynamics is also discussed.",1410.8444v2
+2014-11-11,"Three-dimensional spin-orbit coupled Fermi gases: Fulde-Ferrell pairing, Majorana fermions, Weyl fermions and gapless topological superfluidity","We theoretically investigate a three-dimensional Fermi gas with Rashba
+spin-orbit coupling in the presence of both out-of-plane and in-plane Zeeman
+fields. We show that, driven by a sufficiently large Zeeman field, either
+out-of-plane or in-plane, the superfluid phase of this system exhibits a number
+of interesting features, including inhomogeneous Fulde-Ferrell pairing, gapped
+or gapless topological order and exotic quasi-particle excitations known as
+Weyl fermions that have linear energy dispersions in momentum space (i.e.,
+massless Dirac fermions). The topological superfluid phase can have either four
+or two topologically protected Weyl nodes. We present the phase diagrams at
+both zero and finite temperatures and discuss the possibility of their
+observation in an atomic Fermi gas with synthetic spin-orbit coupling. In this
+context, topological superfluid phases with an imperfect Rashba spin-orbit
+coupling are also studied.",1411.2993v1
+2015-06-01,Spin-orbit coupling and proximity effects in metallic carbon nanotubes,"We study spin-orbit coupling in metallic carbon nanotubes (CNTs) within the
+many-body Tomonaga-Luttinger liquid (TLL) framework. For a well defined
+sub-class of metallic CNTs, that contains both achiral zig-zag as well as a
+sub-set of chiral tubes, an effective low energy field theory description is
+derived. We aim to describe system at finite dopings, but close to the charge
+neutrality point (commensurability). A new regime is identified where
+spin-orbit coupling leads to an inverted hierarchy of mini-gaps of bosonic
+modes. We then add a proximity coupling to a superconducting (SC) substrate and
+show that the only order parameter that is supported within the novel,
+spin-orbit induced phase is a topologically trivial s-SC.",1506.00465v2
+2015-07-28,Topological features of hydrogenated graphene,"Hydrogen adatoms are one of the most the promising proposals for the
+functionalization of graphene. Hydrogen induces narrow resonances near the
+Dirac energy, which lead to the formation of magnetic moments. Furthermore,
+they also create local lattice distortions which enhance the spin-orbit
+coupling. The combination of magnetism and spin-orbit coupling allows for a
+rich variety of phases, some of which have non trivial topological features. We
+analyze the interplay between magnetism and spin-orbit coupling in ordered
+arrays of hydrogen on graphene monolayers, and classify the different phases
+that may arise. We extend our model to consider arrays of adsorbates in
+graphene-like crystals with stronger intrinsic spin-orbit couplings.",1507.07714v2
+2015-11-05,Phase diagram and topological superfluid state of spin-orbit coupled Fermi gas with attractive interactions in a one-dimensional optical lattice,"Based on density matrix renormalization group method, we investigate the
+spin-orbit coupled Fermi gas with attractive interactions in one-dimensional
+optical lattice and present a complete phase diagram for a quarter-filling
+system with intermediate strong interactions. We unveil the exotic pairings
+induced by spin-orbit couplings and the phase transitions between different
+pairing states, and further demonstrate the existence of the long-sought
+topological superfluid state at moderate magnetic field and spin-orbit coupling
+strength. For the particle conserved system, this topological superfluid state
+can be fixed by its gapless single particle excitation, Luttinger parameter and
+non-trivial boundary effect. Our study removes out the widespread doubt on the
+existence of topological superfluid in one dimension and paves the way for
+simulating topological superfluid states in cold atom settings.",1511.01762v1
+2016-02-10,Excitation spectra of a Bose-Einstein condensate with an angular spin-orbit coupling,"A theoretical model of a Bose-Einstein condensate with angular spin-orbit
+coupling has recently been proposed and it has been established that a
+half-skyrmion represents the ground state in a certain regime of spin-orbit
+coupling and interaction. Here we investigate low-lying excitations of this
+phase by using the Bogoliubov method and numerical simulations of the
+time-dependent Gross-Pitaevskii equation. We find that a sudden shift of the
+trap bottom results in a complex two-dimensional motion of the system's center
+of mass that is markedly different from the response of a competing phase, and
+comprises two dominant frequencies. Moreover, the breathing mode frequency of
+the half-skyrmion is set by both the spin-orbit coupling and the interaction
+strength, while in the competing state it takes a universal value. Effects of
+interactions are especially pronounced at the transition between the two
+phases.",1602.03538v2
+2016-09-18,Exotic Multi-fold Vortex Lattices of Spin-Orbit Coupled Bose-Einstein Condensates in Optical Lattices,"We investigate the ground state of two-dimensional Bose-Einstein condensates
+with Rashba spin-orbit coupling in square optical lattices and demonstrate the
+existence of rich phases with different lattice structures, which is closely
+related to the degenerate structure of single particle energy spectrum induced
+by the competition of spin-orbit coupling and optical lattices. We find that
+the ground state is in the phase with either parity-time-reversal or parity
+symmetry by direct numerical simulation. We show the phase diagram of ground
+state in the whole regime of spin-orbit coupling strength, and particularly
+find that the system supports multi-fold vortex lattices, in which ground state
+holds half-quantum vortex lattices, vortex-antivortex pair lattices and
+fundamental vortex lattices, simultaneously, when single particle energy
+minimums touch the boundary of the first Brillouin zone.",1609.05489v1
+2016-09-23,The mechanism of spin-orbit coupling in a 2D oxide interface,"The presence of spin-orbit coupling drives the anomalous magnetotransport at
+oxide interfaces and forms the basis for numerous intriguing properties of
+these 2D electron systems, such as topologically protected phases or
+anti-localization. For many of those systems, the identification of the
+underlying coupling mechanism is obfuscated by multi-band effects. We therefore
+analyze the transport of LaAlO$_3$/SrTiO$_3$ interfaces under high pressures, a
+technique to single out the multi-band contributions. We argue that the
+observed magnetoresistance is due to quantum interference and not related to
+Coulomb interaction. Therefore, this system is an excellent candidate to
+generate a metal-insulator transition of the long-sought symplectic 2D
+universality class. It is shown that the spin-orbit coupling can be linked
+unambiguously to the band structure with a cubic (Dresselhaus-like) rather than
+a linear (Rashba-like) spin-orbit band splitting.",1609.07425v1
+2017-02-10,Phase space curvature in spin-orbit coupled ultracold atom systems,"We consider a system with spin-orbit coupling and derive equations of motion
+which include the effects of Berry curvatures. We apply these equations to
+investigate the dynamics of particles with equal Rashba-Dresselhaus spin-orbit
+coupling in one dimension. In our derivation, the adiabatic transformation is
+performed first and leads to quantum Heisenberg equations of motion for
+momentum and position operators. These equations explicitly contain
+position-space, momentum-space, and phase-space Berry curvature terms.
+Subsequently, we perform the semiclassical approximation, and obtain the
+semiclassical equations of motion. Taking the low-Berry-curvature limit results
+in equations that can be directly compared to previous results for the motion
+of wavepackets. Finally, we show that in the semiclassical regime, the
+effective mass of the equal Rashba-Dresselhaus spin-orbit coupled system can be
+viewed as a direct effect of the phase-space Berry curvature.",1702.03298v2
+2018-04-21,Topological phase and chiral edge states of bilayer graphene with staggered sublattice potentials and Hubbard interaction,"Gated heterostructures containing bilayer graphene with staggered sublattice
+potentials are investigated by tight binding model with Rashba spin-orbital
+coupling and Hubbard interaction. The topological phase diagrams depend on the
+combinations of substrates and the Hubbard interaction. The presence of the
+staggered sublattice potential favor the topological phase transition with
+small Rashba spin-orbital coupling strength. The presence of the Hubbard
+interaction modified the topological phase boundaries, increasing the minimal
+spin-orbital coupling strength for topological phase transition. A phase space
+of topological semi-metal with indirect band gap is identified in the
+non-interacting systems. For the bilayer graphene with different staggered
+sublattice potentials in the two layers, the conditions for the zigzag
+nanoribbons to host edge polarized chiral edge states are discussed. The
+conditions require moderate or vanishing Rashba spin-orbital coupling strength,
+as well as proper range of the gate voltage. The conditions for the systems
+with and without the Hubbard interaction are compared. The edge polarization
+can be controlled by the gate voltage.",1804.07868v4
+2013-08-30,Ferromagnetism in a two-component Bose-Hubbard model with a synthetic spin-orbit coupling,"We study the effect of the synthetic spin-orbit coupling in a two-component
+Bose-Hubbard model in one dimension by employing the density-matrix
+renormalization group method. A ferromagnetic long-range order emerges in both
+Mott insulator and superfluid phases resulting from the spontaneous breaking of
+the $Z_2$ symmetry, when the spin-orbit coupling term becomes comparable to the
+hopping kinetic energy and the inter-component interaction is smaller than the
+intra-one as well. This novel effect is expected to be detectable with the
+present realization of the synthetic spin-orbit coupling in experiments.",1308.6710v3
+2013-09-26,Proximity effect of spin orbit coupling in Pt/Co2FeAl and Pt/Permalloy bilayers_810571,"Proximity effect of spin orbit coupling is investigated through anomalous
+Hall effect in Pt/Co2FeAl and Pt/Permalloy bilayers. A series of nontrivial
+magnetotransport behaviors, resulting from a strong impact of phonons on skew
+scattering, is observed in these films with ultrathin ferromagnetic layers. The
+parameters representing skew scattering, side jump and intrinsic contributions
+are dramatically enhanced when the ferromagnetic layer is very thin, and they
+have clear linear dependences on the reciprocal of ferromagnetic layer
+thickness, indicating a powerful influence of Pt/Ferromagnet interface. Further
+study on Cu/Co2FeAl and Ta/Co2FeAl bilayers reveals that a simple interface
+scattering without intense spin orbit coupling is not sufficient to trigger
+such a phenomenon. The proximity effect of spin orbit coupling is thus
+suggested to occur at the Pt/Ferromagnet interface, and as a result quite large
+anomalous Hall angle (0.036) and Nernst angle (0.23) are confirmed in the
+Pt/CFA films at room temperature.",1309.7023v1
+2016-08-23,Calculating branching ratio and spin-orbit coupling from first-principles: A formalism and its application to iridates,"We present a simple technique to calculate spin-orbit coupling, $\langle {\bf
+L}\cdot{\bf S} \rangle$, and branching ratio measured in x-ray absorption
+spectroscopy. Our method is for first-principles electronic structure
+calculation and its implementation is straightforward for any of standard
+formulations and codes. We applied this technique to several different large
+spin-orbit coupling iridates. The calculated $\langle{ {\bf L}\cdot{\bf S}}
+\rangle$ and branching ratio of a prototype $j_{\rm eff}$=1/2 Mott insulator,
+Sr$_2$IrO$_4$, are in good agreement with recent experimental data over the
+wide range of Rh-doping. Three different double perovskite iridates (namely,
+Sr$_2$MgIrO$_6$, Sr$_2$ScIrO$_6$, and Sr$_2$TiIrO$_6$) are also well described.
+This technique can serve as a promising tool for studying large spin-orbit
+coupling materials from first-principles and for understanding experiments.",1608.06388v1
+2016-12-06,Odd-petal states and persistent flows in spin-orbit-coupled Bose-Einstein condensates,"We study the phase diagram of a Rashba spin-orbit-coupled Bose-Einstein
+condensate confined in a two-dimensional toroidal trap. In the immiscible
+regime we find an azimuthally periodic density distribution, with the
+periodicity highly tuneable as a function of the spin-orbit coupling strength
+and which favours an odd number of petals in each component. This allows for a
+wide range of states that can be created. We further show that in the miscible
+regime, both components possess states with persistent flows with a unit
+winding number difference between them and with the absolute values of these
+winding numbers depending on the spin-orbit coupling strength. All features of
+the odd-petal and the persistent flow states can be explained using a simple
+but effective model.",1612.01713v3
+2016-12-08,Topological Phonon Modes in A Two-Dimensional Wigner Crystal,"We investigate the spin-orbit coupling effect in a two-dimensional Wigner
+crystal. We show that sufficiently strong spin-orbit coupling and an
+appropriate sign of g-factor could transform the Wigner crystal to a
+topological phonon system. We demonstrate the existence of chiral phonon edge
+modes in finite size samples, as well as the robustness of the modes in the
+topological phase. We explore the possibility of realizing the topological
+phonon system in two-dimensional Wigner crystals confined in semiconductor
+quantum wells/heterostructure. We find that the spin-orbit coupling is too weak
+for driving a topological phase transition in these systems. We argue that one
+may look for the topological phonon system in correlated Wigner crystals with
+emergent effective spin-orbit coupling.",1612.02871v1
+2017-07-08,Spin-Orbit Coupling and Electronic Correlations in Sr2RuO4,"We investigate the interplay of spin-orbit coupling (SOC) and electronic
+correlations in Sr2RuO4 using dynamical mean-field theory. We find that SOC
+does not affect the correlation-induced renormalizations, which validates the
+Hund's metal picture of ruthenates even in the presence of the sizable SOC
+relevant to these materials. Nonetheless, SOC found to change significantly the
+electronic structure at k-points where a degeneracy applies in its absence. We
+explain why these two observations are consistent with one another and
+calculate effects of SOC on the correlated electronic structure. The magnitude
+of these effects is found to depend on the energy of the quasiparticle state
+under consideration, leading us to introduce the notion of an ""energy-dependent
+quasiparticle spin-orbit coupling"". This notion is generally applicable to all
+materials in which both the spin-orbit coupling and electronic correlations are
+sizable.",1707.02462v2
+2018-01-24,Superconducting monolayer deposited on substrate: effects of the spin-orbit coupling induced by proximity effects,"The spin-orbit coupling can lead to exotic states of matter and unexpected
+behavior of the system properties. In this paper, we investigate the influence
+of spin-orbit coupling induced by proximity effects on a monolayer of
+superconductor (with s-wave or d-wave pairing) placed on an insulating bulk. We
+show that the critical temperatures $T_{c}$ of the superconducting states can
+be tuned by the spin-orbit coupling both in the case of on-site and inter-site
+pairing. Moreover, we discuss a possibility of changing the location of the
+maximal $T_{c}$ from the half-filling into the underdoped or overdoped regimes.",1801.08055v1
+2019-06-18,Topological phase transition induced by magnetic proximity effect in two dimensions,"We study the magnetic proximity effect on a two-dimensional topological
+insulator in a CrI$_3$/SnI$_3$/CrI$_3$ trilayer structure. From
+first-principles calculations, the BiI$_3$-type SnI$_3$ monolayer without
+spin-orbit coupling has Dirac cones at the corners of the hexagonal Brillouin
+zone. With spin-orbit coupling turned on, it becomes a topological insulator,
+as revealed by a non-vanishing $Z_2$ invariant and an effective model from
+symmetry considerations. Without spin-orbit coupling, the Dirac points are
+protected if the CrI$_3$ layers are stacked ferromagnetically, and are gapped
+if the CrI$_3$ layers are stacked antiferromagnetically, which can be explained
+by the irreducible representations of the magnetic space groups $C_{3i}^1$ and
+$C_{3i}^1(C_3^1)$, corresponding to ferromagnetic and antiferromagnetic
+stacking, respectively. By analyzing the effective model including the
+perturbations, we find that the competition between the magnetic proximity
+effect and spin-orbit coupling leads to a topological phase transition between
+a trivial insulator and a topological insulator.",1906.07507v1
+2019-09-26,Anharmonicity Induced Supersolidity In Spin-Orbit Coupled Bose-Einstein Condensates,"Supersolid, a fascinating quantum state of matter, features novel phenomena
+such as the non-classical rotational inertia and transport anomalies. It is a
+long standing issue of the coexistence of superfluidity and broken
+translational symmetry in condensed matter physics. By recent experimental
+advances to create tunable synthetic spin-orbit coupling in ultracold gases,
+such highly controllable atomic systems would provide new possibilities to
+access supersolidity with no counterpart in solids. Here we report that the
+combination of anharmonicity of trapping potential and spin-orbit coupling will
+provide a new paradigm to achieve supersolids. By means of imaginary time
+evolution of the Gross-Pitaevskii equation, we demonstrate that a supersolid
+state can be found when considering a trapped Rashba-type spin-orbit coupled
+bosonic atoms loaded in a one-dimensional optical lattice. Furthermore, a
+skyrmion-anti-skyrmion lattice is associated with the appearance of such
+supersoildity, indicating the topological nontrivial properties of our proposed
+supersolids.",1909.11871v1
+2012-05-30,Spin-Orbit Coupling in Iridium-Based 5d Compounds Probed by X-ray Absorption Spectroscopy,"We have performed x-ray absorption spectroscopy (XAS) measurements on a
+series of Ir-based 5d transition metal compounds, including Ir, IrCl3, IrO2,
+Na2IrO3, Sr2IrO4, and Y2Ir2O7. By comparing the intensity of the ""white-line""
+features observed at the Ir L2 and L3 absorption edges, it is possible to
+extract valuable information about the strength of the spin-orbit coupling in
+these systems. We observe remarkably large, non-statistical branching ratios in
+all Ir compounds studied, with little or no dependence on chemical composition,
+crystal structure, or electronic state. This result confirms the presence of
+strong spin-orbit coupling effects in novel iridates such as Sr2IrO4, Na2IrO3,
+and Y2Ir2O7, and suggests that even simple Ir-based compounds such as IrO2 and
+IrCl3 may warrant further study. In contrast, XAS measurements on Re-based 5d
+compounds, such as Re, ReO2, ReO3, and Ba2FeReO6, reveal statistical branching
+ratios and negligible spin-orbit coupling effects.",1205.6540v1
+2017-09-06,An oscillating Casimir potential between two impurities in a spin-orbit coupled Bose-Einstein condensate,"We study the Casimir potential between two impurities immersed in a
+spin-orbit coupled BoseEinstein condensate (BEC) with plane-wave order. We find
+that, by exchanging the virtual phonons/excitations, a remarkable anisotropic
+oscillating potential with both positive and negative parts can be induced
+between the impurities, with the period of the oscillation depending on the
+spin-orbit coupling strength. As a consequence, this would inevitably lead to a
+non-central Casimir force, which can be tuned by varying the strength of
+spin-orbit coupling . These results are elucidated for BECs with
+one-dimensional Raman-induced and two-dimensional Rashba-type SOC.",1709.01978v1
+2017-09-20,Bound States in the Continuum in Spin-Orbit Coupled Atomic Systems,"We show that the interplay between spin-orbit coupling and Zeeman splitting
+in atomic systems can lead to the existence of bound states in the continuum
+(BICs) supported by trapping potentials. Such states have energies falling well
+within the continuum spectrum, but nevertheless they are localized and fully
+radiationless. We report the existence of BICs, in some cases in exact
+analytical form, in systems with tunable spin-orbit coupling and show that the
+phenomenon is physically robust. We also found that BIC states may be excited
+in spin-orbit-coupled Bose-Einstein condensates, where under suitable
+conditions they may be metastable with remarkably long lifetimes.",1709.06987v1
+2018-03-10,Topological Nonlinear Optics with Spin-Orbit coupled Bose-Einstein Condensate in Cavity,"We report topological nonlinear optics with spin-orbit coupled Bose-Einstein
+condensate in a cavity. The cavity is driven by a pump laser and weak probe
+laser which excite Bose-Einstein condensate to an intermediate storage level,
+where the standard Raman process engineers spin-orbit coupling. We show that
+the nonlinear photonic interactions at the transitional pathways of dressed
+states result in new type of optical transparencies, which get completely
+inverted with atom induced gain. These nonlinear interactions also implant
+topological sort of features in probe transmission modes by inducing gapless
+Dirac-like cones, which become gaped in presence of Raman detuning. The
+topological features get interestingly enhanced in gain regime where the
+gapless topological edge-like states emerge among the probe modes, which can
+cause non-trivial phase transition. We show that spin-orbit coupling and Zeeman
+field effects also impressively revamp fast and slow probe light. The
+manipulation of dressed states for quantum nonlinear optics with topological
+characteristics in our findings could be a crucial step towards topological
+quantum computation.",1803.03815v1
+2018-08-06,Thermal Hall Conductivity in Superconducting Phase on Kagome Lattice,"Motivated by a previous ""$sd^2$-graphene"" study, the pairing symmetry in the
+superconducting state and the thermal Hall conductivity are investigated by a
+self-consistent Bogoliubov--de Gennes approach on the kagome lattice with
+intrinsic spin-orbit coupling near van Hove fillings. While the topologically
+trivial state with broken time-reversal symmetry appears in the absence of
+spin-orbit coupling, the highest flat band becomes dispersive with a hexagonal
+symmetry due to spin-orbit coupling, which leads to a topological
+superconducting state. Since the thermal Hall conductivity in the
+low-temperature limit is associated with the topological property of
+time-reversal symmetry breaking superconductors, we study its temperature
+dependence near van Hove fillings. In particular, the pairing symmetry in the
+highest flat band is sensitive to the amplitudes of spin-orbit coupling and the
+attractive interaction, which is reflected remarkably in the thermal Hall
+conductivity. The obtained result may enable us to investigate the stable
+superconducting state on the kagome lattice.",1808.01765v2
+2019-02-22,Quantum solitons in spin-orbit-coupled Bose-Bose mixtures,"Recent experimental and theoretical results show that weakly interacting
+atomic Bose-Bose mixtures with attractive interspecies interaction are
+stabilized by beyond-mean-field effects. Here we consider the peculiar
+properties of these systems in a strictly one-dimensional configuration, taking
+also into account the nontrivial role of spin-orbit and Rabi couplings. We show
+that when the value of inter- and intraspecies interaction strengths are such
+that mean-field contributions to the energy cancel, a self-bound bright soliton
+fully governed by quantum fluctuations exists. We derive the phase diagram of
+the phase transition between a single-peak soliton and a multipeak (striped)
+soliton, produced by the interplay between spin-orbit, Rabi couplings and
+beyond-mean-field effects, which also affect the breathing mode frequency of
+the atomic cloud. Finally, we prove that a phase imprinting of the single-peak
+soliton leads to a self-confined propagating solitary wave even in the presence
+of spin-orbit coupling.",1902.08603v2
+2019-04-15,Charge transport of a spin-orbit-coupled Luttinger liquid,"The charge transport of a (Tomonaga-)Luttinger liquid with tunnel barriers
+exhibits universal scaling: the current-voltage curves measured at various
+temperatures collapse into a single curve upon rescaling. The exponent
+characterizing this single curve can be used to extract the strength of
+electron-electron interaction. Motivated by a recent experiment on InAs
+nanowires [Sato et al., Phys. Rev. B 99, 155304 (2019)], we theoretically
+investigate the analogous behavior of a spin-orbit-coupled Luttinger liquid. We
+find that the scaling exponent differs for different impurity strengths, being
+weak (disorder potential) or strong (tunnel barriers), and their positions,
+either in the bulk or near the edge of the wire. For each case we quantify the
+exponent of the universal scaling and its modification due to the spin-orbit
+coupling. Our findings serve as a guide in the determination of the interaction
+strength of quasi-one-dimensional spin-orbit-coupled quantum wires from
+transport measurements.",1904.06869v2
+2020-05-11,Universal relations for hybridized $s$- and $p$-wave interactions from spin-orbital coupling,"In this work, we study the universal relations for one-dimensional
+spin-orbital-coupled fermions near both $s$- and $p$-wave resonances using
+effective field theory. Since the spin-orbital coupling mixes different partial
+waves, a contact matrix is introduced to capture the non-trivial correlation
+between dimers. We find the signature of the spin-orbital coupling appears at
+the leading order for the off-diagonal components of the momentum distribution
+matrix, which is proportional to $1/q^{3}$ ($q$ is the relative momentum). We
+further derive the large frequency behavior of the Raman spectroscopy, which
+serves as an independent measurable quantity for contacts. Finally, we give an
+explicit example of contacts by considering a two-body problem.",2005.04997v2
+2020-10-08,Fraunhofer oscillations of the critical current at a varying Zeeman field in a spin-orbit coupled Josephson junction,"The Zeeman interaction results in spontaneous current through a Josephson
+contact with a spin-orbit coupled normal metal, even in the absence of any
+voltage, or phase bias. In the case of the Rashba spin orbit coupling of
+electrons in a two-dimensional (2D) electron gas this effect takes place for
+the Zeeman field which is parallel to the 2D system and to superconducting
+contacts. At the same time, the spontaneous current is absent when this field
+is perpendicular to the contacts. It is shown that in the latter case it may
+manifest itself in oscillations of the critical Josephson current at the
+varying Zeeman energy. These oscillations have a form of the Fraunhofer
+diffraction pattern. The Josephson current under the phase bias was calculated
+based on the semiclassical Green functions for a disordered 2D electron gas
+with the strong spin orbit coupling, as well as for surface electrons of a
+three dimensional topological insulator. In the latter case the diffraction
+pattern was found to be most pronounced, while in the Rashba gas the
+oscillations of the critical current are weaker.",2010.03932v1
+2021-05-20,Coexistence of ferromagnetism and spin-orbit coupling by incorporation of platinum in two-dimensional VSe$_2$,"We report on a novel material, namely two-dimensional (2D)
+V$_{1-x}$Pt$_x$Se$_2$ alloy, exhibiting simultaneously ferromagnetic order and
+Rashba spin-orbit coupling. While ferromagnetism is absent in 1T-VSe$_2$ due to
+the competition with the charge density wave phase, we demonstrate
+theoretically and experimentally that the substitution of vanadium by platinum
+in VSe$_2$ (10-50 %) to form an homogeneous 2D alloy restores ferromagnetic
+order with Curie temperatures of 6 K for 5 monolayers and 25 K for one
+monolayer of V$_{0.65}$Pt$_{0.35}$Se$_2$. Moreover, the presence of platinum
+atoms gives rise to Rashba spin-orbit coupling in (V,Pt)Se$_2$ providing an
+original platform to study the interplay between ferromagnetism and spin-orbit
+coupling in the 2D limit.",2105.10022v1
+2021-12-23,On the effective models of spin-orbit coupling in a two-dimensional electron gas,"We use the method of invariants to derive one- and two-band effective
+Hamiltonians of a noncentrosymmetric two-dimensional electron gas, in the
+presence of magnetic field. A complete classification of the antisymmetric
+spin-orbit and magnetic coupling terms near the $\Gamma$ point is developed for
+all two-dimensional crystal symmetries. The effective Hamiltonian depends on
+the symmetry of the Bloch bands at the $\Gamma$ point, which is described by
+one of the double-valued corepresentations of the two-dimensional magnetic
+point group. In some bands, the spin-orbit coupling is cubic in the electron
+momentum and the effective Zeeman interaction is strongly anisotropic. As an
+example of a two-band effective Hamiltonian, we introduce a simple model of a
+topological insulator with the intraband and interband spin-orbit coupling and
+investigate its bulk and boundary properties.",2112.12657v1
+2022-05-07,Interplay between the extended s-wave symmetry of the gap and the spin-orbit coupling in the low-electron concentration regime of quasi-two-dimensional superconductors,"We analyze the real-space paired state with the $\mathbf{k}$-dependent
+superconducting gap in the presence of Rashba type spin-orbit coupling and
+external magnetic field. We show that the $extended$ $s$-$wave$ pairing
+symmetry is the most probable scenario to appear in the low-electron
+concentration regime. According to our study, the van Hove singularity induced
+by the spin-orbit coupling may lead to a significant enhancement of the
+superconducting gap, critical temperature and critical magnetic field.
+Moreover, the combined effect of the spin-orbit coupling and the external
+magnetic field results in a non-zero total momentum of the Cooper pairs, which
+is a characteristic feature of the so-called helical state. In such situation,
+due to the C$_4$ symmetry breaking, a small $d$-$wave$ and $p$-$wave$
+contributions to the pairing appear, which significantly change the character
+of the helical state. The obtained results are discussed in the context of the
+experimental data related with the unconventional superconducting features of
+the transition metal oxide interfaces as well as the recently reported
+supercurrent diode effect.",2205.03632v3
+2022-06-24,Elementary excitations in a spin-orbit-coupled spin-1 Bose-Einstein condensate,"While a spin-orbit-coupled spin-1 Bose-Einstein condensate has been
+experimentally observed, its elementary excitations remain unclear in the
+stripe phase. Here, we systematically study the elementary excitations in three
+distinct phases of a spin-orbit-coupled spin-1 Bose-Einstein condensate. We
+find that the excitation spectrum as well as the corresponding static response
+function and structure factor depend strongly on spin-orbit coupling parameters
+such as the quadratic Zeeman field and the Rabi frequency. In the stripe phase,
+besides two gapless Goldstone modes, we show the existence of roton
+excitations. Finally, we demonstrate that quantum phase transitions between
+these different phases including the zero-momentum, plane wave and stripe
+phases are characterized by the sound velocities and the quantum depletion.",2206.12053v1
+2022-08-16,Tunable planar Josephson junctions driven by time-dependent spin-orbit coupling,"Integrating conventional superconductors with common III-V semiconductors
+provides a versatile platform to implement tunable Josephson junctions (JJs)
+and their applications. We propose that with gate-controlled time-dependent
+spin-orbit coupling, it is possible to strongly modify the current-phase
+relations and Josephson energy and provide a mechanism to drive the JJ
+dynamics, even in the absence of any bias current. We show that the transition
+between stable phases is realized with a simple linear change in the strength
+of the spin-orbit coupling, while the transition rate can exceed the
+gate-induced electric field GHz changes by an order of magnitude. The resulting
+interplay between the constant effective magnetic field and changing spin-orbit
+coupling has direct implications for superconducting spintronics, controlling
+Majorana bound states, and emerging qubits. We argue that topological
+superconductivity, sought for fault-tolerant quantum computing, offers simpler
+applications in superconducting electronics and spintronics.",2208.07512v2
+2024-02-13,Spin-coupled molecular orbitals: chemical intuition meets quantum chemistry,"Molecular orbital theory is powerful both as a conceptual tool for
+understanding chemical bonding, and as a theoretical framework for ab initio
+quantum chemistry. Despite its undoubted success, MO theory has well documented
+shortcomings, most notably that it fails to correctly describe diradical states
+and homolytic bond fission. In this contribution, we introduce a generalised MO
+theory that includes spin-coupled radical states. We show through archetypical
+examples that when bonds break, the electronic state transitions between a
+small number of valence configurations, characterised by occupation of both
+delocalised molecular orbitals and spin-coupled localised orbitals. Our theory
+provides a model for chemical bonding that is both chemically intuitive and
+qualitatively accurate when combined with ab initio theory. Although
+exploitation of our theory presents significant challenges for classical
+computing, the predictable structure of spin-coupled states is ideally suited
+to algorithms that exploit quantum computers. Our approach provides a
+systematic route to overcoming the initial state overlap problem and unlocking
+the potential of quantum computational chemistry.",2402.08858v1
+2024-02-06,Emergence of Weyl Points due to Spin Orbit Coupling in LK-99,"Recent reports of room temperature ambient pressure superconductivity in
+LK-99 sparked tremendous excitement. While the materials is no longer believed
+to be superconducting, interest in its electronic and topological properties
+still stands. Here, we utilize first-principle density functional theory and
+augment a recently proposed model tight-binding Hamiltonian to study the band
+topology including the impact of spin-orbit coupling. In the absence of
+spin-orbit coupling, we observed the presence of two isolated bands situated
+near the Fermi level. However, upon the introduction of spin-orbit coupling,
+these two bands split into four bands and generate multiple Weyl points with
+Chern number $\pm 2$. We also find accidental crossings along high symmetry
+lines which, at the level of our minimal Hamiltonian, extend as nodal surfaces
+away from these lines.",2402.18588v1
+2018-11-04,Nonequatorial circular orbits of spinning particles in the Schwarzschild-de Sitter background,"In this paper analytical solutions of the Mathisson-Papapetrou equations that
+describe nonequatorial circular orbits of a spinning particle in the
+Schwarzschild-de Sitter background are studied, and the role of the
+cosmological constant is emphasized. It is shown that generally speaking a
+highly relativistic velocity of the particle is a necessary condition of motion
+along this type of orbits, with an exception of orbits locating close to the
+position of the static equilibrium, where low velocities are possible as well.
+Depending on the correlation between the spin orientation of the particle and
+its orbital velocity some of the possible nonequatorial circular orbits exist
+due to the repulsive action on the particle caused by the spin-gravity coupling
+and the others are caused by the attractive action.Here values of the energy of
+the particle on the corresponding orbits are also analyzed.",1811.01391v2
+2016-11-23,Dynamics of extended bodies with spin-induced quadrupole in Kerr spacetime: generic orbits,"We discuss motions of extended bodies in Kerr spacetime by using
+Mathisson-Papapetrou-Dixon equations. We firstly solve the conditions for
+circular orbits, and calculate the orbital frequency shift due to the mass
+quadrupoles. The results show that we need not consider the spin-induced
+quadrupoles in extreme-mass-ratio inspirals for spatial gravitational wave
+detectors. We quantitatively investigate the temporal variation of rotational
+velocity of the extended body due to the coupling of quadrupole and background
+gravitational field. For generic orbits, we numerically integrate the
+Mathisson-Papapetrou-Dixon equations for evolving the motion of an extended
+body orbiting a Kerr black hole. By comparing with the monopole-dipole
+approximation, we reveal the influences of quadrupole moments of extended
+bodies on the orbital motion and chaotic dynamics of extreme-mass-ratio
+systems. We do not find any chaotic orbits for the extended bodies with
+physical spins and spin-induced quadrupoles. Possible implications for
+gravitational wave detection and pulsar timing observation are outlined.",1611.07602v1
+2015-11-04,Quantum Loop States in Spin-Orbital Models on the Honeycomb Lattice,"We construct a physically realistic and analytically tractable model for
+spin-1 systems with orbital degeneracy on the honeycomb lattice, relevant to
+honeycomb materials with large Hund's and weak spin-orbit couplings, and two
+electrons in t2g orbitals. This model realizes many new phases whose building
+blocks are orbital loops decorated by Haldane chains. These include a Haldane
+loop crystal, a symmetry-protected topological phase, and, notably, a regime
+where the decorated loops resonate. When taken to the three-dimensional
+hyperhoneycomb lattice, the latter regime becomes a (symmetry-enriched) U(1)
+quantum spin-orbital liquid, ""disordered"" both in the spin and orbital
+channels. We hope this construction will pave the way for realizing many of the
+Haldane-chain-based phases which have been theoretically proposed in the
+literature.",1511.01505v1
+2022-06-15,Bond Ordering and Molecular Spin-Orbital Fluctuations in the Cluster Mott Insulator GaTa$_4$Se$_8$,"For materials where spin-orbit coupling is competitive with electronic
+correlations, the spatially anisotropic spin-orbital wavefunctions can
+stabilize degenerate states that lead to many and diverse quantum phases of
+matter. Here, we find evidence for a dynamical spin-orbital state preceding a
+T$^*$=50 K order-disorder spin-orbital ordering transition in the $j\!=\!3/2$
+lacunar spinel GaTa$_4$Se$_8$. Above T$^*$, GaTa$_4$Se$_8$ has an average cubic
+crystal structure, but total scattering measurements indicate local non-cubic
+distortions of Ta$_4$ tetrahedral clusters for all measured temperatures $2 < T
+< 300$ K. Inelastic neutron scattering measurements reveal the dynamic nature
+of these local distortions through symmetry forbidden optical phonon modes that
+modulate $j\!=\!3/2$ molecular orbital occupation as well as intercluster Ta-Se
+bonds. Spin-orbital ordering at T$^*$ cannot be attributed to a classic
+Jahn-Teller mechanism and based on our findings, we propose that intercluster
+interactions acting on the scale of T$^*$ act to break global symmetry. The
+resulting staggered intercluster dimerization pattern doubles the unit cell,
+reflecting a spin-orbital valence bond ground state.",2206.07738v1
+2016-07-11,Orbital-differentiated coherence-incoherence crossover identified by photoemission spectroscopy in LiFeAs,"In the iron-based superconductors (FeSCs), orbital differentiation is an
+important phenomenon, whereby correlations stronger on the dxy orbital than on
+the dxz/yz orbital yield quasi-particles with dxy} orbital character having
+larger mass renormalization and abnormal temperature evolution. However, the
+physical origin of this orbital differentiation is debated between the Hund's
+coupling induced unbinding of spin and orbital degrees of freedom and the
+Hubbard interaction instigated orbital selective Mott transition. Here we use
+angle-resolved photoemission spectroscopy to identify an orbital-dependent
+correlation-induced quasi-particle (QP) anomaly in LiFeAs. The excellent
+agreement between our photoemission measurements and first-principles many-body
+theory calculations shows that the orbital-differentiated QP lifetime anomalies
+in LiFeAs are controlled by the Hund's coupling.",1607.02947v1
+2002-07-23,From the bulk to monatomic wires: An ab-initio study of magnetism in Co systems with various dimensionality,"A systematic ab-initio study within the framework of the local-spin-density
+approximation including spin-orbit coupling and an orbital-polarization term is
+performed for the spin and orbital moments and for the X-ray magnetic circular
+dichroism (XMCD) spectra in hcp Co, in a Pt supported and a free standing Co
+monolayer, and in a Pt supported and a free standing monatomic Co wire. When
+including the orbital-polarization term, the orbital moments increase
+drastically when going to lower dimensionality, and there is an increasing
+asymmetry between the L_2 and L_3 XMCD signal. It is shown that spin and
+orbital moments can be obtained with good accuracy from the XMCD spectra via
+the sum rules. The <T_z> term of the spin sum rule is surprisingly small for
+the wires, and the reason for this is discussed.",0207561v1
+2002-05-08,"Interplay of charge, spin, orbital and lattice correlations in colossal magnetoresistance manganites","We derive a realistic microscopic model for doped colossal magnetoresistance
+manganites, which includes the dynamics of charge, spin, orbital and lattice
+degrees of freedom on a quantum mechanical level. The model respects the SU(2)
+spin symmetry and the full multiplet structure of the manganese ions within the
+cubic lattice. Concentrating on the hole doped domain ($0\le x\le 0.5$) we
+study the influence of the electron-lattice interaction on spin and orbital
+correlations by means of exact diagonalisation techniques. We find that the
+lattice can cause a considerable suppression of the coupling between spin and
+orbital degrees of freedom and show how changes in the magnetic correlations
+are reflected in dynamic phonon correlations. In addition, our calculation
+gives detailed insights into orbital correlations and demonstrates the
+possibility of complex orbital states.",0205150v2
+2016-12-09,The Fermi surface of Sr2RuO4: spin-orbit and anisotropic Coulomb interaction effects,"The topology of the Fermi surface of Sr2RuO4 is well described by
+local-density approximation calculations with spin-orbit interaction, but the
+relative size of its different sheets is not. By accounting for many-body
+effects via dynamical mean-field theory, we show that the standard isotropic
+Coulomb interaction alone worsens or does not correct this discrepancy. In
+order to reproduce experiments, it is essential to account for the Coulomb
+anisotropy. The latter is small but has strong effects; it competes with the
+Coulomb-enhanced spin-orbit coupling and the isotropic Coulomb term in
+determining the Fermi surface shape. Its effects are likely sizable in other
+correlated multi-orbital systems. In addition, we find that the low-energy
+self-energy matrix -- responsible for the reshaping of the Fermi surface --
+sizably differ from the static Hartree-Fock limit. Finally, we find a strong
+spin-orbital {entanglement}; this supports the view that the conventional
+description of Cooper pairs via factorized spin and orbital part might not
+apply to Sr2RuO4.",1612.03060v1
+2007-07-18,Oscillation of spin polarization in a two-dimensional hole gas under a perpendicular magnetic field,"Spin-charge coupling is studied for a strongly confined two-dimensional hole
+gas subject to a perpendicular magnetic field. The study is based on
+spin-charge coupled drift-diffusion equations derived from quantum-kinetic
+equations in an exact manner. The spin-orbit interaction induces an extra
+out-of-plane spin polarization. This contribution exhibits a persistent
+oscillatory pattern in the strong-coupling regime.",0707.2644v1
+2009-07-17,Electrically controlled persistent spin currents at the interface of multiferroic oxides,"We predict the appearance of a persistent spin current in a two-dimensional
+electron gas formed at the interface of multiferroic oxides with a transverse
+helical magnetic order. No charge current is generated. This is the result of
+an effective spin-orbit coupling generated by the topology of the oxide local
+magnetic moments. The effective coupling and the generated spin current depend
+linearly on the magnetic spiral helicity which, due to the magneto-electric
+coupling, is tunable by a transverse electric field offering thus a new mean
+for the generation of electrically controlled persistent spin currents.",0907.3023v1
+2020-05-14,Vibrational Origin of Exchange Splitting and Chirality Induced Spin Selectivity,"Electron exchange and correlations emerging from the coupling between ionic
+vibrations and electrons are addressed. Spin-dependent electron-phonon coupling
+originates from the spin-orbit interaction, and it is shown that such
+electron-phonon coupling introduces exchange splitting between the spin
+channels in the structure. By application of these results to a model for a
+chiral molecular structure mounted between metallic leads, the chirality
+induced spin selectivity is found to become several tens of percents using
+experimentally feasible parameters.",2005.06753v1
+2021-12-09,Sign-Free Determinant Quantum Monte Carlo Study of Excitonic Density Orders in a Two-Orbital Hubbard-Kanamori Model,"While excitonic instabilities in multiorbital systems recently have come
+under scrutiny in a variety of transition-metal compounds, understanding
+emergence of these instabilities from strong electronic interactions has
+remained a challenge. Here, we present a sign-problem-free determinant quantum
+Monte Carlo study of excitonic density orders in a half-filled two-orbital
+Hubbard-Kanamori model with broken orbital degeneracy, which accounts for the
+role of Hund's coupling in transition-metal compounds. For strong inverted
+(negative) Hund's exchange, we find numerical evidence for the emergence of
+excitonic density order, with competition between anti-ferro-orbital order and
+$\mathbf{Q} = (\pi,\pi)$ excitonic density order as a function of orbital
+splitting and Hund's coupling. While inverted Hund's coupling stabilizes a
+spin-singlet excitonic density phase for weak orbital splitting, positive
+Hund's coupling favors a spin-triplet excitonic density phase.",2112.04718v1
+2023-09-13,Spin-orbital correlations from complex orbital order in MgV$_{2}$O$_{4}$,"MgV$_{2}$O$_{4}$ is a spinel based on magnetic V$^{3+}$ ions which host both
+spin ($S=1$) and orbital ($l_{eff}=1$) moments. Owing to the underlying
+pyrochlore coordination of the magnetic sites, the spins in MgV$_{2}$O$_{4}$
+only antiferromagnetically order once the frustrating interactions imposed by
+the $Fd\overline{3}m$ lattice are broken through an orbitally-driven structural
+distortion at T$_{S}$ $\simeq$ 60 K. Consequently, a N\'eel transition occurs
+at T$_{N}$ $\simeq$ 40 K. Low temperature spatial ordering of the electronic
+orbitals is fundamental to both the structural and magnetic properties, however
+considerable discussion on whether it can be described by complex or real
+orbital ordering is ambiguous. We apply neutron spectroscopy to resolve the
+nature of the orbital ground state and characterize hysteretic spin-orbital
+correlations using x-ray and neutron diffraction. Neutron spectroscopy finds
+multiple excitation bands and we parameterize these in terms of a multi-level
+(or excitonic) theory based on the orbitally degenerate ground state.
+Meaningful for the orbital ground state, we report an ""optical-like"" mode at
+high energies that we attribute to a crystal-field-like excitation from the
+spin-orbital $j_{eff}$=2 ground state manifold to an excited $j_{eff}$=1 energy
+level. We parameterize the magnetic excitations in terms of a Hamiltonian with
+spin-orbit coupling and local crystalline electric field distortions resulting
+from deviations from perfect octahedra surrounding the V$^{3+}$ ions. We
+suggest that this provides compelling evidence for complex orbital order in
+MgV$_{2}$O$_{4}$. We then apply the consequences of this model to understand
+hysteretic effects in the magnetic diffuse scattering where we propose that
+MgV$_{2}$O$_{4}$ displays a high temperature orbital memory of the low
+temperature spin order.",2309.06853v1
+2006-04-24,Theory of spin-Hall transport of heavy holes in semiconductor quantum wells,"Based on a proper definition of the spin current, we investigate the
+spin-Hall effect of heavy holes in narrow quantum wells in the presence of
+Rashba spin-orbit coupling by using a spin-density matrix approach. In contrast
+to previous results obtained on the basis of the conventional definition of the
+spin current, we arrive at the conclusion that an electric-field-induced
+steady-state spin-Hall current does not exist in both, pure and disordered
+infinite samples. Only an ac field can induce a spin-Hall effect in such
+systems.",0604539v1
+2006-07-19,Topological aspects of quantum spin Hall effect in graphene: Z$_2$ topological order and spin Chern number,"For generic time-reversal invariant systems with spin-orbit couplings, we
+clarify a close relationship between the Z$_2$ topological order and the spin
+Chern number proposed by Kane and Mele and by Sheng {\it et al.}, respectively,
+in the quantum spin Hall effect. It turns out that a global gauge
+transformation connects different spin Chern numbers (even integers) modulo 4,
+which implies that the spin Chern number and the Z$_2$ topological order yield
+the same classification. We present a method of computing spin Chern numbers
+and demonstrate it in single and double plane of graphene.",0607484v1
+2008-08-20,Electrical probing of the spin conductance of mesoscopic cavities,"We investigate spin-dependent transport in three--terminal mesoscopic
+cavities with spin--orbit coupling. Focusing on the inverse spin Hall effect,
+we show how injecting a pure spin current or a polarized current from one
+terminal generates additional charge current and/or voltage across the two
+output terminals. This allows to extract the spin conductance of the cavity
+from two purely electrical measurements on the output. We use random matrix
+theory to show that the spin conductance of chaotic ballistic cavities
+fluctuates universally about zero mesoscopic average and describe experimental
+implementations of mesoscopic spin to charge current converters.",0808.2756v2
+2014-09-25,Interfacial Spin and Heat Transfer between Metals and Magnetic Insulators,"We study the role of thermal magnons in the spin and heat transport across a
+normal-metal/insulating-ferromagnet interface, which is beyond an elastic
+electronic spin transfer. Using an interfacial exchange Hamiltonian, which
+couples spins of itinerant and localized orbitals, we calculate spin and energy
+currents for an arbitrary interfacial temperature difference and misalignment
+of spin accumulation in the normal metal relative to the ferromagnetic order.
+The magnonic contribution to spin current leads to a temperature-dependent
+torque on the magnetic order parameter; reciprocally, the coherent precession
+of the magnetization pumps spin current into the normal metal, the magnitude of
+which is affected by the presence of thermal magnons.",1409.7128v1
+2004-02-26,Decoherence of transported spin in multichannel spin-orbit coupled spintronic devices: Scattering approach to spin density matrix from the ballistic to the localized regime,"By viewing current in the detecting lead of a spintronic device as being an
+ensemble of flowing spins corresponding to a mixed quantum state, where each
+spin itself is generally described by an improper mixture generated during the
+transport where it couples to other degrees of freedom due to spin-orbit (SO)
+interactions or inhomogeneous magnetic fields, we introduce the spin density
+operator associated with such current expressed in terms of the spin-resolved
+Landauer transmission matrix of the device. This formalism, which provides
+complete description of coupled spin-charge quantum transport in open
+finite-size systems attached to external probes, is employed to understand how
+initially injected pure spin states, comprising fully spin-polarized current,
+evolve into the mixed ones corresponding to partially polarized current. We
+analyze particular routes that diminish spin coherence (signified by decay of
+the off-diagonal elements of the current spin density matrix) in
+two-dimensional electron gas-based devices due to the interplay of the Rashba
+and/or Dresselhaus SO coupling and: (i) scattering at the boundaries or
+lead-wire interface in ballistic semiconductor nanowires; or (ii)
+spin-independent scattering off static impurities in both weakly and strongly
+localized disordered nanowires. The physical interpretation of spin decoherence
+in the course of multichannel quantum transport in terms of the entanglement of
+spin to an effectively zero-temperature ``environment'' composed of more than
+one open orbital conducting channels offers insight into some of the key
+challenges for spintronics: controlling decoherence of transported spins and
+emergence of partially coherent spin states in all-electrical spin manipulation
+schemes based on the SO interactions in realistic semiconductor structures.",0402662v3
+2019-02-04,Visualizing Complex-Valued Molecular Orbitals,"We report an implementation of a program for visualizing complex-valued
+molecular orbitals. The orbital phase information is encoded on each of the
+vertices of triangle meshes using the standard color wheel. Using this program,
+we visualized the molecular orbitals for systems with spin-orbit couplings,
+external magnetic fields, and complex absorbing potentials. Our work has not
+only created visually attractive pictures, but also clearly demonstrated that
+the phases of the complex-valued molecular orbitals carry rich chemical and
+physical information of the system, which has often been unnoticed or
+overlooked.",1902.01284v1
+2024-02-29,Coupling a single spin to high-frequency motion,"Coupling a single spin to high-frequency mechanical motion is a fundamental
+bottleneck of applications such as quantum sensing, intermediate and
+long-distance spin-spin coupling, and classical and quantum information
+processing. Previous experiments have only shown single spin coupling to
+low-frequency mechanical resonators, such as diamond cantilevers.
+High-frequency mechanical resonators, having the ability to access the quantum
+regime, open a range of possibilities when coupled to single spins, including
+readout and storage of quantum states. Here we report the first experimental
+demonstration of spin-mechanical coupling to a high-frequency resonator. We
+achieve this all-electrically on a fully suspended carbon nanotube device. A
+new mechanism gives rise to this coupling, which stems from spin-orbit
+coupling, and it is not mediated by strain. We observe both resonant and
+off-resonant coupling as a shift and broadening of the electric dipole spin
+resonance (EDSR), respectively. We develop a complete theoretical model taking
+into account the tensor form of the coupling and non-linearity in the motion.
+Our results propel spin-mechanical platforms to an uncharted regime. The
+interaction we reveal provides the full toolbox for promising applications
+ranging from the demonstration of macroscopic superpositions, to the operation
+of fully quantum engines, to quantum simulators.",2402.19288v1
+1998-07-20,Alternating Spin and Orbital Dimerization in Strong-coupling Two-band Models,"We study a one-dimensional Hamiltonian consisting of coupled SU(2) spin and
+orbital degrees of freedom. Using the density matrix renormalization group, we
+calculate the phase-diagram and the ground state correlation functions for this
+model. We find that, in addition to the ferromagnetic and power-law
+antiferromagnetic phases for spin and orbital degrees of freedom, this model
+has a gapless line extending from the ferromagnetic phase to the Bethe ansatz
+solvable SU(4) critical point, and a gapped phase with doubly degenerate ground
+states which form alternating spin and orbital singlets. The spin-gap and the
+order parameters are evaluated and the relevance to several recently discovered
+spin-gap materials is discussed.",9807270v1
+2006-08-10,Weak antilocalization and zero-field electron spin splitting in AlGaN/AlN/GaN heterostructures with a polarization induced two-dimensional electron gas,"Spin-orbit coupling is studied using the quantum interference corrections to
+conductance in AlGaN/AlN/GaN two-dimensional electron systems where the carrier
+density is controlled by the persistent photoconductivity effect. All the
+samples studied exhibit a weak antilocalization feature with a spin-orbit field
+of around 1.8 mT. The zero-field electron spin splitting energies extracted
+from the weak antilocalization measurements are found to scale linearly with
+the Fermi wavevector with an effective linear spin-orbit coupling parameter
+5.5x10^{-13} eV m. The spin-orbit times extracted from our measurements varied
+from 0.74 to 8.24 ps within the carrier density range of this experiment.",0608254v1
+2013-02-19,Chirality Sensitive Domain Wall Motion in Spin-Orbit Coupled Ferromagnets,"Using the Lagrangian formalism, we solve analytically the equations of motion
+for current-induced domain-wall dynamics in a ferromagnet with Rashba
+spin-orbit coupling. An exact solution for the domain wall velocity is
+provided, including the effect of non-equilibrium conduction electron
+spin-density, Gilbert damping, and the Rashba interaction parameter. We
+demonstrate explicitly that the influence of spin-orbit interaction can be
+qualitatively different from the role of non-adiabatic spin-torque in the sense
+that the former is sensitive to the chirality of the domain wall whereas the
+latter is not: the domain wall velocity shows a reentrant behavior upon
+changing the chirality of the domain wall. This could be used to experimentally
+distinguish between the spin-orbit and non-adiabatic contribution to the wall
+speed. A quantitative estimate for the attainable domain wall velocity is
+given, based on an experimentally relevant set of parameters for the system.",1302.4744v1
+2013-05-01,"Electronic Structure of a Two-Dimensional Graphene-Like Topological Insulator, Bi14Rh3I9","Very recently, a new two-dimensional graphene-like topological insulator,
+Bi14Rh3I9, has been synthesized. The Bi-Rh sheets with a strong spin-orbit
+interaction are graphene analogues with a honeycomb net composed of RhBi8
+cubes. Here we derive the low-energy effective Hamiltonian involving spin-orbit
+coupling for Bi14Rh3I9. In the absence of spin-orbit coupling, the Bi-Rh sheets
+show two inequivalent Dirac cones at the corners of the hexagonal Brillouin
+zone. The spin-orbit interaction opens a 2400 K bandgap at the Dirac points and
+establishes the quantum spin Hall effect in the Bi-Rh sheets. Our result
+indicates that the Bi14Rh3I9 may combine many unique electronic properties of
+graphene and topological insulators, and it should host a combination of
+quantum valley and spin Hall effects.",1305.0121v2
+2019-05-28,Spin-Orbit Torque in a Single Ferromagnetic Layer with Large Spin-Orbit Coupling,"Spin-orbit torque in heavy metal/ferromagnet heterostructures with broken
+spatial inversion symmetry provides an efficient mechanism for manipulating
+magnetization using a charge current. Here, we report the presence of a spin
+torque in a single ferromagnetic layer in both asymmetric MgO/Fe0.8Mn0.2 and
+symmetric MgO/Fe0.8Mn0.2/MgO structures, which manifests itself in the form of
+an effective field transverse to the charge current. The current to effective
+field conversion efficiency, which is characterized using both the nonlinear
+magnetoresistance and second-order planar Hall effect methods, is comparable to
+the efficiency in typical heavy metal/ferromagnet bilayers. We argue that the
+torque is caused by spin rotation in the vicinity of the surface via impurity
+scattering in the presence of a strong spin-orbit coupling. Instead of
+cancelling off with each other, the torques from the top and bottom surfaces
+simply add up, leading to a fairly large net torque, which is readily observed
+experimentally.",1905.11565v1
+2018-09-06,Zero-Field Splitting Parameters from Four-Component Relativistic Methods,"We report an approach for determination of zero-field splitting parameters
+from four-component relativistic calculations. Our approach involves neither
+perturbative treatment of spin-orbit interaction nor truncation of the
+spin-orbit coupled states. We make use of a multi-state implementation of
+relativistic complete active space perturbation theory (CASPT2), partially
+contracted N-electron valence perturbation theory (NEVPT2), and multi-reference
+configuration interaction theory (MRCI), all with the fully internally
+contracted ansatz. A mapping is performed from the Dirac Hamiltonian to the
+pseudospin Hamiltonian, using correlated energies and the magnetic moment
+matrix elements of the reference wavefunctions. Direct spin-spin coupling is
+naturally included through the full 2-electron Breit interaction. Benchmark
+calculations on chalcogen diatomics and pseudotetrahedral cobalt(II) complexes
+show accuracy comparable to the commonly used state-interaction with spin-orbit
+(SI-SO) approach, while tests on a uranium(III) single-ion magnet suggest that
+for actinide complexes the strengths of our approach through the more robust
+treatment of spin-orbit effects and the avoidence of state truncation are of
+greater importance.",1809.02151v1
+2019-03-08,Field-free spin-orbit torque switching in Co/Pt/Co multilayer with mixed magnetic anisotropies,"Spin-orbit-torque (SOT) induced magnetization switching in Co/Pt/Co trilayer,
+with two Co layers exhibiting magnetization easy axes orthogonal to each other
+is investigated. Pt layer is used as a source of spin-polarized current as it
+is characterized by relatively high spin-orbit coupling. The spin Hall angle of
+Pt, $\theta = 0.08$ is quantitatively determined using spin-orbit torque
+ferromagnetic resonance technique. In addition, Pt serves as a spacer between
+two Co layers and depending on it's thickness, different interlayer exchange
+coupling (IEC) energy between ferromagnets is induced. Intermediate IEC
+energies, resulting in a top Co magnetization tilted from the perpendicular
+direction, allows for SOT-induced feld-free switching of the top Co layer. The
+switching process is discussed in more detail, showing the potential of the
+system for neuromorphic applications.",1903.03368v1
+2019-12-23,Complete Magneto-Optic Modulation of Lateral and Angular Shifts in Spin-Orbit Coupled Members of the Graphene Family,"The intrinsic spin-orbit coupling in the 2D staggered monolayer
+semiconductors is very large as compared to graphene. The large spin orbit
+interaction in these materials leads to the opening of a gap in the energy
+spectrum and spin-splitting of the bands in each valley. In this paper, we
+theoretically investigate the mechanical steering of beams from these
+spin-orbit rich, staggered 2D materials. Mechanical steering results in
+noticeable deviations of the reflected and transmitted ray profiles as
+predicted from classical laws of optics. These effects are generally called the
+Goos-Hanchen (GH) and Imbert-Fedorov shifts. We find that electric and magnetic
+field modulated giant spatial and angular GH shifts can be achieved in these
+materials for incident angles in the vicinity of Brewster angle in terahertz
+regime. We also determine the dependence of beam shifts on the chemical
+potential and find that the Brewster angle and the sign of GH shift can be
+controlled by varying the chemical potential. This allows the possibility of
+realizing spin and valley dependent optical effects that can be useful readout
+markers for experiments in quantum information processing, biosensing and
+valleytronics, employed in the terahertz regime.",1912.10727v1
+2020-11-24,Optical isolation induced by subwavelength spinning particle via spin-orbit interaction,"Optical isolation enables nonreciprocal manipulations of light with broad
+applications in optical communications. Optical isolation by rotating
+structures has drawn considerable attention due to its magnetic-free nature and
+unprecedented performance. Conventional rotation-based optical isolation relies
+on the use of bulky cavities hindering applications in subwavelength photonics.
+Here, we propose a novel mechanism of optical isolation by integrating the
+unique dispersion of a hyperbolic metamaterial with the transverse spin-orbit
+interaction of evanescent waves. We show that rotation of a subwavelength
+hyperbolic nanoparticle breaks the time-reversal symmetry and yields two
+resonant chiral modes that selectively couple to the transverse spin of
+waveguide modes. Remarkably, the transverse spin-orbit interaction can give
+rise to unidirectional coupling and $>95\%$ isolation of infrared light at an
+experimentally feasible rotation speed. Our work fuses the two important fields
+of optical isolation and photonic spin-orbit interactions, leading to
+magnetic-free yet compact nonreciprocal devices for novel applications in
+optical communications, chiral quantum optics, and topological photonics.",2011.11973v2
+2021-07-27,All-electrical control of hole singlet-triplet spin qubits at low leakage points,"We study the effect of the spin-orbit interaction on heavy holes confined in
+a double quantum dot in the presence of a magnetic field of arbitrary
+direction. Rich physics arise as the two hole states of different spin are not
+only coupled by the spin-orbit interaction but additionally by the effect of
+site-dependent anisotropic $g$ tensors. It is demonstrated that these effects
+may counteract in such a way as to cancel the coupling at certain detunings and
+tilting angles of the magnetic field. This feature may be used in
+singlet-triplet qubits to avoid leakage errors and implement an electrical
+spin-orbit switch, suggesting the possibility of task-tailored two-axes
+control. Additionally, we investigate systems with a strong spin-orbit
+interaction at weak magnetic fields. By exact diagonalization of the dominant
+Hamiltonian we find that the magnetic field may be chosen such that the qubit
+ground state is mixed only within the logical subspace for realistic system
+parameters, hence reducing leakage errors and providing reliable control over
+the qubit.",2107.12622v1
+2022-07-21,Influence of nonuniform magnetization reorientation on spin-orbit torque measurements,"Measurements of spin-orbit torques in a ferromagnetic/nonmagnetic multilayer
+are typically based on an assumption that the entire ferromagnetic layer
+uniformly responds to the spin-orbit torque. This assumption breaks down when
+the thickness of the ferromagnetic layer is comparable to the dynamic exchange
+coupling length, which can be as short as a few nanometers in certain
+measurement geometries. The nonuniform magnetization reorientation coupled with
+nonuniform contribution of each magnetic sublayer to the magnetoresistance or
+the Kerr effect may impact the accuracy in the extrapolation of spin-orbit
+torque, particularly if a thick ferromagnetic layer is used. In this paper, we
+use numerical models to investigate such an impact in three different
+techniques: the magneto-optic-Kerr-effect method, the second-harmonic method
+and the spin torque ferromagnetic resonance method. We show that the
+second-harmonic and magneto-optic-Kerr-effect methods are prone to be
+influenced by the nonuniform magnetization reorientation, while the spin torque
+ferromagnetic resonance method is much less impacted.",2207.10349v1
+2018-07-03,Weak anti-localization of two-dimensional holes in germanium beyond the diffusive regime,"Gate-controllable spin-orbit coupling is often one requisite for spintronic
+devices. For practical spin field-effect transistors, another essential
+requirement is ballistic spin transport, where the spin precession length is
+shorter than the mean free path such that the gate-controlled spin precession
+is not randomized by disorder. In this letter, we report the observation of a
+gate-induced crossover from weak localization to weak anti-localization in the
+magneto-resistance of a high-mobility two-dimensional hole gas in a strained
+germanium quantum well. From the magneto-resistance, we extract the
+phase-coherence time, spin-orbit precession time, spin-orbit energy splitting,
+and cubic Rashba coefficient over a wide density range. The mobility and the
+mean free path increase with increasing hole density, while the spin precession
+length decreases due to increasingly stronger spin-orbit coupling. As the
+density becomes larger than $\sim6\times 10^{11}$cm$^{-2}$, the spin precession
+length becomes shorter than the mean free path, and the system enters the
+ballistic spin transport regime. We also report here the numerical methods and
+code developed for calculating the magneto-resistance in the ballistic regime,
+where the commonly used HLN and ILP models for analyzing weak localization and
+anti-localization are not valid. These results pave the way toward
+silicon-compatible spintronic devices.",1807.01400v1
+2021-11-17,Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction,"Qubits encoded in the spin state of heavy holes confined in Si- and Ge-based
+semiconductor quantum dots are currently leading the efforts toward spin-based
+quantum information processing. The virtual absence of spinful nuclei in
+purified samples yields long qubit coherence times and the intricate coupling
+between spin and momentum in the valence band can provide very fast
+spin-orbit-based qubit control, e.g., via electrically induced modulations of
+the heavy-hole $g$-tensor. A thorough understanding of all aspects of the
+interplay between spin-orbit coupling, the confining potentials, and applied
+magnetic fields is thus quintessential for the development of the optimal
+hole-spin-based qubit platform. Here we theoretically investigate the
+manifestation of the effective $g$-tensor and effective mass of heavy holes in
+two-dimensional hole gases as well as in lateral quantum dots. We include the
+effects of the anisotropy of the effective Luttinger Hamiltonian (particularly
+relevant for Si-based systems) and we focus on the detailed role of the
+orientation of the transverse confining potential. We derive most general
+analytic expressions for the anisotropic $g$-tensor and we present a general
+and straightforward way to calculate corrections to this $g$-tensor for
+localized holes due to various types of spin-orbit interaction, exemplifying
+the approach by including a simple linear Rashba-like term. Our results thus
+contribute to the understanding needed to find optimal points in parameter
+space for hole-spin qubits, where confinement is effective and
+spin-orbit-mediated electric control over the spin states is efficient.",2111.09164v1
+1997-04-24,Structural Aspects of Magnetic Coupling in CaV4O9,"The strong corrugation of the V4O9 layer in the spin gap system CaV4O9 is
+examined for its impact on the exchange coupling constants between the spin 1/2
+V ions. Local spin density (LSD) calculations show that the V spin occupies a
+d(x^2-y^2) orbital (x and y are the V-V directions). The Kanamori-Goodenough
+superexchange rules, and the degeneracy of ferromagnetic and antiferromagnetic
+alignments within LSD, suggest that 2nd neighbor couplings dominate over
+nearest neighbor, resulting in two coupled S=1/2 metaplaquette systems.",9704203v1
+2003-06-13,Rashba spin splitting in different quantum channels,"Rashba precession of spins moving along a one-subband quantum channel is
+calculated. The quantitative influence of unoccupied higher subbands depends on
+the shape of the transversal confinement and can be accounted for
+perturbatively. Coulomb interactions are included within the
+Tomonaga--Luttinger model with spin-orbit coupling incorporated. Increasing
+interaction strength at decreasing carrier density is found to {\sl enhance}
+spin precession.",0306358v1
+2004-05-18,Multichannel field-effect spin barrier selector,"We have studied spin carrier dynamics under full spin-orbit coupling. The
+anisotropy of dispersions for independent circular spinor polarizations is
+explored as a possible vertical multichannel voltage controlled spin-filter.
+Small voltage variations are found to select the current polarizations in a
+resonant tunneling geometry.",0405418v1
+2005-02-18,The spin-double refraction in two-dimensional electron gas,"We briefly review the phenomenon of the spin-double refraction that
+originates at an interface separating a two-dimensional electron gas with
+Rashba spin-orbit coupling from a one without. We demonstrate how this
+phenomenon in semiconductor heterostructures can produce and control a
+spin-polarized current without ferromagnetic leads.",0502456v1
+2021-07-15,Colossal orbital-Edelstein effect in non-centrosymmetric superconductors,"In superconductors that lack inversion symmetry, the flow of supercurrent can
+induce a non-vanishing magnetization, a phenomenon which is at the heart of
+non-dissipative magneto-electric effects, also known as Edelstein effects. For
+electrons carrying spin and orbital moments a question of fundamental relevance
+deals with the orbital nature of magneto-electric effects in conventional
+spin-singlet superconductors with Rashba coupling. Remarkably, we find that the
+supercurrent-induced orbital magnetization is more than one order of magnitude
+greater than that due to the spin, giving rise to a colossal magneto-electric
+effect. The induced orbital magnetization is shown to be sign tunable, with the
+sign change occurring for the Fermi level lying in proximity of avoiding
+crossing points in the Brillouin zone and in the presence of superconducting
+phase inhomogeneities, yielding domains with opposite orbital moment
+orientation. The orbital-dominated magneto-electric phenomena, hence, have
+clear-cut marks for detection both in the bulk and at the edge of the system
+and are expected to be a general feature of multi-orbital superconductors
+without inversion symmetry breaking.",2107.07476v1
+2012-06-23,Spin Structures of Spin-Orbit Coupled Square-Lattice Antiferromagnets,"We have realized that our results have a strong overlap with those previously
+published in J Chovan, N Papanicolaou, and S Komineas,
+Phys.Rev.B65,064433(2002).",1206.5381v2
+2005-04-13,NMR relaxation rate in non-centrosymmetric superconductors,"The spin-lattice relaxation rate of nuclear magnetic resonance in a clean
+superconductor without inversion center is calculated for arbitrary pairing
+symmetry and band structure, in the presence of strong spin-orbit coupling.",0504342v1
+2016-08-21,"Hidden orbital polarization in diamond, silicon, germanium, gallium arsenide and layered materials","It was previously believed that the Bloch electronic states of non-magnetic
+materials with inversion symmetry cannot have finite spin polarizations.
+However, since the seminal work by Zhang et al. [Nat. Phys. 10, 387-393 (2014)]
+on local spin polarizations of Bloch states in non-magnetic, centrosymmetric
+materials, the scope of spintronics has been significantly broadened. Here, we
+show, using a framework that is universally applicable independent of whether
+hidden spin polarizations are small (e.g., diamond, Si, Ge, and GaAs) or large
+(e.g., MoS2 and WSe2), that the corresponding quantity arising from orbital -
+instead of spin - degrees of freedom, the hidden orbital polarization, is (i)
+much more abundant in nature since it exists even without spin-orbit coupling
+and (ii) more fundamental since the interband matrix elements of the
+site-dependent orbital angular momentum operator determines the hidden spin
+polarization. We predict that the hidden spin polarization of transition metal
+dichalcogenides is reduced significantly upon compression. We suggest
+experimental signatures of hidden orbital polarization from photoemission
+spectroscopies and demonstrate that the current-induced hidden orbital
+polarization may play a far more important role than its spin counterpart in
+antiferromagnetic information technology by calculating the current-driven
+antiferromagnetism in compressed silicon.",1608.05989v4
+2020-12-08,Flipping spins in mass transferring binaries and origin of spin-orbit misalignment in binary black holes,"Close stellar binaries are prone to undergo a phase of stable mass transfer
+in which a star loses mass to its companion. Assuming that the donor star loses
+mass along the instantaneous interstellar axis, we derive the orbit-averaged
+equations of motion describing the evolution of the donor rotational angular
+momentum vector (spin) which accompanies the transfer of mass. We consider: (i)
+a model in which the mass transfer rate is constant within each orbit and (ii)
+a phase-dependent rate in which all mass per orbit is lost at periapsis. In
+both cases, we find that the ejection of $\gtrsim 30$ per cent of the donor's
+initial mass causes its spin to nearly flip onto the orbital plane of the
+binary, independently of the initial spin-orbit alignment. Moreover, we show
+that the spin flip due to mass transfer can easily dominate over tidal
+synchronisation in any giant stars and main-sequence stars with masses
+$\sim1.5$ to $5\,\rm M_\odot$. Finally, the general equations of motion,
+including tides, are used to evolve a realistic population of massive binary
+stars leading to the formation of binary black holes. Assuming that the stellar
+core and envelope are fully coupled, the resulting tilt of the first-born black
+hole reduces its spin projection onto the orbit normal by a factor
+$\sim\mathcal{O}(0.1)$. This result supports previous studies in favour of an
+insignificant contribution to the effective spin projection, $\chi_{\rm eff}$,
+in binary black holes formed from the evolution of field binaries.",2012.06329v2
+2005-11-30,Spin Hall effect in clean two dimensional electron gases with Rashba spin-orbit coupling,"We study the spin polarization induced by a current flow in clean two
+dimensional electron gases with Rashba spin-orbit coupling. This geometric
+effect originates from special properties of the electron's scattering at the
+edges of the sample. In wide samples, the spin polarization has it largest
+value at low energies (close to the bottom of the band) and goes to zero at
+higher energies. In this case, the spin polarization is dominated by the
+presence of evanescent modes which have an explicit spin component outside the
+plane. In quantum wires, on the other hand, the spin polarization is dominated
+by interference effects induced by multiple scattering at the edges. Here, the
+spin polarization is quite sensitive to the value of the Fermi energy,
+especially close to the point where a new channel opens up. We analyzed
+different geometries and found that the spin polarization can be strongly
+enhanced.",0511750v1
+2005-12-16,Hole spin dephasing in $p$-type semiconductor quantum wells,"Hole spin dephasing time due to the D'yakonov-Perel' mechanism in $p$-type
+GaAs (100) quantum wells with well separated light-hole and heavy-hole bands is
+studied by constructing and numerically solving the kinetic spin Bloch
+equations. We include all the spin-conserving scattering such as the
+hole-phonon and the hole-nonmagnetic impurity as well as the hole-hole Coulomb
+scattering in our calculation. Different effects such as the temperature, the
+hole density, the impurity density and the Rashba coefficient on the spin
+dephasing are investigated in detail. We also show that the Coulomb scattering
+makes marked contribution to the spin dephasing. The spin dephasing time can
+either increase or decrease with temperature, hole/impurity density or the
+inclusion of the Coulomb scattering depending on the relative importance of the
+spin-orbit coupling and the scattering. It is also shown that due to the
+different spin-orbit coupling strengthes, many spin dephasing properties of
+holes are quite different from those of electrons.",0512398v2
+2010-06-15,Non-magnetic Stern-Gerlach Experiment from Electron Diffraction,"Using the wave nature of the electrons, we demonstrate that a transverse spin
+current can be generated simply by the diffraction through a single slit in the
+spin-orbital coupling system of the two-dimensional electron gas. The
+diffracted electron picks up the transverse momentum. The up spin electron goes
+one way and the down spin electron goes the other, producing the coherent spin
+current. In the system of spin-orbital coupling $\sim10^{-13}$ eV$\cdot$m, the
+\emph{out-of-plane} component of the spin of the electron can be generated up
+to 0.42 $\hbar$. Based on this effect, a novel device of grating to distill
+spin is designed. Two first diffraction peaks of electron carry different
+spins, duplicating the non-magnetic version of Stern-Gerlach experiment. The
+direction of the spin current can be controlled by the gate voltage with low
+energy cost.",1006.2872v1
+2013-04-24,Effect of Dresselhaus spin-orbit coupling on spin dephasing in asymmetric and macroscopically symmetric (110)-grown quantum wells,"We develop the microscopic theory of electron spin dephasing in (110)-grown
+quantum wells where the electron scattering time is comparable to or exceeds
+the period of spin precession in the effective magnetic field caused by
+spin-orbit coupling. Structures with homogeneous and fluctuating Rashba field,
+which triggers the dephasing of electron spins aligned along the growth
+direction, are analyzed. We show that the Dresselhaus field, which is always
+present in zinc-blende-type quantum wells, suppresses the spin dephasing
+enabling very long spin lifetime of conduction electrons. The dependence of the
+spin lifetime on the electron mobility is found to be nonmonotonic reaching the
+minimum in structures where the scattering time is comparable to the period of
+spin precession in the effective magnetic field.",1304.6600v1
+2013-10-08,Spin-Orbit Coupled One-Dimensional Fermi Gases with Infinite Repulsion,"The current efforts of studying many-body effects with spin-orbit coupling
+(SOC) using alkali-metal atoms are impeded by the heating effects due to
+spontaneous emission. Here, we show that even for SOCs too weak to cause any
+heating, dramatic many-body effects can emerge in a one-dimensional(1D) spin
+1/2 Fermi gas provided the interaction is sufficiently repulsive. For weak
+repulsion, the effect of a weak SOC (with strength $\Omega$) is perturbative.
+inducing a weak spin spiral (with magnitude proportional to $\Omega$). However,
+as the repulsion $g$ increases beyond a critical value ($g_c\sim 1/\Omega$),
+the magnitude of the spin spiral rises rapidly to a value of order 1
+(independent of $\Omega$). Moreover, near $g=+\infty$, the spins of neighboring
+fermions can interfere destructively due to quantum fluctuations of particle
+motion, strongly distorting the spin spiral and pulling the spins substantially
+away from the direction of the local field at various locations. These effects
+are consequences of the spin-charge separation in the strongly repulsive limit.
+They will also occur in other 1D quantum gases with higher spins.",1310.1993v2
+2014-07-16,Spin Excitation Spectra of Spin-Orbit Coupled Bosons in Optical Lattice,"Spin-wave excitation plays important roles in the investigation of the
+magnetic phases. In this paper, we study the spin-wave excitation spectra of
+two-component Bose gases with spin-orbit coupling on a deep square optical
+lattice using spin-wave theory. We find that, while the excitation spectrum of
+the vortex crystal phase is gapless with a linear dispersion in the vicinity of
+the minimum point, the spectra of the commensurate spiral spin phase and the
+skyrmion crystal phase are gapped. Significantly, the spin fluctuations
+strongly destabilize the classical ground state of the skyrmion phase. It
+suggests the emergence of a new state in the phase diagram. Such features of
+the spin excitation spectra provide further insights into the exploration of
+the exotic spin phases.",1407.4172v1
+2016-07-26,Strain-controlled spin splitting in the conduction band of monolayer WS2,"Spin splitting bands that arises in conduction band minimum (CBM) of WS2
+monolayer (ML) play an important role in the new spin-orbit phenomena such as
+spin-valley coupled electronics. However, application of strain strongly
+modifies electronic properties of the WS2 ML, which is expected to
+significantly affect to the properties of the spin splitting bands. Here, by
+using fully-relativistic first-principles calculations based on
+density-functional theory, we show that a substantial spin spliting bands
+observed in the CBM is effectively controlled and tuned by applying the biaxial
+strain. We also find that these spin splitting bands induce spin textures
+exhibiting fully out-of-plane spin polarization in the opposite direction
+between the K and Q points and their time reversals in the first Brillouin
+zone. Our study clarify that the strain plays an significant role in the
+spin-orbit coupling of the WS2 ML, which has very important implications in
+designing future spintronics devices.",1607.07566v1
+2020-02-26,"Strain Engineering of Spin and Rashba properties in Group-III Monochalcogenide MX (M=Ga, In and X=S, Se, Te) Monolayer","In this paper, spin properties of monolayer MX (M=Ga, In and X=S, Se, Te) in
+the presence of strain are studied. Density functional theory is used to
+investigate spin properties. The strain changes modification of bandgap due to
+spin-orbit coupling, the results indicate the spin-orbit coupling has a higher
+effect in the compressive regime. Also, spin splitting in the conduction and
+valence bands respect to strain are compared for six materials. The location of
+conduction band minimum (CBM) imposed a type of spin properties. These
+materials with mirror symmetry can display the Rashba effect while M valley is
+located at CBM. Strain tunes the conduction band minimum in three valleys (K, M
+and $\Gamma$ valleys) and determines which spin effect (spin splitting, Rashba
+splitting or no spin splitting) has occurred in each strain for every material.
+Lastly, the relation between the Rashba parameter and the atomic mass is
+explored and it is observed that there is a linear correlation between atomic
+mass and Rashba coefficient.",2002.11426v1
+2022-11-14,Degeneracy removal of spin bands in antiferromagnets with non-interconvertible spin motif pair,"Energy bands in antiferromagnets are generally spin degenerate in the absence
+of spin-orbit coupling (SOC). Recent studies [Physical Review B 102, 014422
+(2020)] identified formal symmetry conditions for crystals for which this
+degeneracy can be lifted even in the zero SOC limit. Such materials could
+enable ""spin-split"" antiferromagnetic spintronics without the burden of use of
+heavy atom compounds. Here, we show that these formal symmetry conditions can
+be interpreted in terms of easy-to-visualize local motif pair, such as
+octahedra or tetrahedra, each carrying opposite magnetic moments. Collinear
+antiferromagnets with such spin motif pair whose components interconvert by
+neither translation nor spatial inversion will show splitting of spin bands.
+Such real-space motif-based approach enables an easy way to identify and design
+of materials having spin splitting without the need for spin orbit coupling,
+and offers insights on the magnitude of spin splitting.",2211.07803v1
+2000-05-30,"Comment on ""Spin relaxation in quantum Hall systems""","W. Apel and Yu.A. Bychkov have recently considered the spin relaxation in a
+2D quantum Hall system for the filling factor close to unity [PRL v.82, 3324
+(1999)]. The authors considered only one spin flip mechanism (direct
+spin-phonon coupling) among several possible spin-orbit related ones and came
+to the conclusion that the spin relaxation time due to this mechanism is quite
+short: around $10^{-10}$ s at B=10 T (for GaAs). This time is much shorter than
+the typical time ($10^{-5}$ s) obtained earlier by D. Frenkel while considering
+the spin relaxation of 2D electrons in a quantizing magnetic field without the
+Coulomb interaction and for the same spin-phonon coupling. I show that the
+authors' conclusion about the value of the spin-flip time is wrong and have
+deduced the correct time which is by several orders of magnitude longer. I also
+discuss the admixture mechanism of the spin-orbit interaction.",0005522v1
+2003-09-19,Semiclassical theory of spin transport in spin-orbit coupled systems,"Motivated by recent interest in novel spintronics effects, we develop a
+semiclassical theory of spin transport that is valid for spin-orbit coupled
+bands. Aside from the obvious convective term in which the average spin is
+transported at the wavepacket group velocity, the spin current has additional
+contributions from the wavepacket's spin and torque dipole moments. Electric
+field corrections to the group velocity and carrier spin contribute to the
+convective term. Summing all terms we obtain an expression for the intrinsic
+spin-Hall conductivity of a hole-doped semiconductor, which agrees with the
+Kubo formula prediction for the same quantity. We discuss the calculation of
+spin accumulation, which illustrates the importance of the torque dipole near
+the boundary of the system.",0309475v4
+2014-08-11,Spin Seebeck Effect in Asymmetric Four-Terminal Systems with Rashba Spin-Orbit Coupling,"We propose a new type of the spin Seebeck effect (SSE) emerging from the
+Rashba spin-orbit coupling in asymmetric four-terminal electron systems. This
+system generates spin currents or spin voltages along the longitudinal
+direction parallel to the temperature gradient in the absence of magnetic
+fields. The remarkable result arises from the breaking of reflection symmetry
+along the transverse direction. In the meantime, the SSE along the transverse
+direction, so-called the spin Nernst effect, with spin currents or spin
+voltages perpendicular to the temperature gradient can be simultaneously
+realized in our system. We further find that it is possible to use the
+temperature differences between four leads to tune the spin Seebeck
+coefficients.",1408.2300v1
+2008-07-14,Electric-field induced spin excitations in two-dimensional spin-orbit coupled systems,"Rigorous coupled spin-charge drift-diffusion equations are derived from
+quantum-kinetic equations for the spin-density matrix that incorporate effects
+due to k-linear spin-orbit interaction, an in-plane electric field, and the
+elastic scattering on nonmagnetic impurities. The explicit analytical solution
+for the induced magnetization exhibits a pole structure, from which the
+dispersion relations of spin excitations are identified. Applications of the
+general approach refer to the excitation of long-lived field-induced spin waves
+by optically generated spin and charge patterns. This approach transfers
+methods known in the physics of space-charge waves to the treatment of spin
+eigenmodes. In addition, the amplification of an oscillating electric field by
+spin injection is demonstrated.",0807.2142v1
+2022-03-07,Nonlinear spin Hall effect in $\mathcal{PT}$-symmetric collinear magnets,"We theoretically investigate a nonlinear spin Hall effect in
+$\mathcal{PT}$-symmetric antiferromagnetic metals, which serve as an efficient
+spin current generator. We elucidate that an emergent spin-dependent Berry
+curvature dipole is a microscopic origin of the nonlinear spin Hall effect,
+which becomes nonzero with neither relativistic spin-orbit coupling, uniform
+magnetization, nor spin-split band structure. By analyzing a microscopic
+antiferromagnetic model without spin-orbit coupling for an intuitive
+understanding of the phenomena, we elucidate essential hopping processes and a
+condition to enhance the nonlinear spin Hall conductivity. We also provide a
+complete table to include useful correspondence among the N\'eel vector,
+odd-parity multipoles, nonlinear spin conductivity tensor, and candidate
+materials in all the $\mathcal{PT}$-symmetric black-and-white magnetic point
+groups.",2203.03754v2
+2022-10-19,Many-body correction to the intrinsic anomalous and spin Hall conductivities,"Broken Galilean invariance in a spin-orbit coupled system can amplify
+many-body effects on its different responses. We study the anomalous Hall and
+spin Hall conductivities of a magnetic two-dimensional electron gas with Rashba
+spin-orbit coupling. We show that both of these conductivities in the intrinsic
+limit are fully specified in terms of the longitudinal and transverse spin-spin
+response functions. We include the effect of electron-electron interaction in
+the spin-spin linear response functions, going beyond the random-phase
+approximation. We do this by incorporating the local-field correction in the
+response functions, which takes into account the many-body exchange-correlation
+effects. We observe a significant enhancement of the static anomalous Hall
+conductivity due to the electron-electron interaction. The many-body correction
+on the spin Hall effects is more non-trivial, and strong electron-electron
+interaction can even reverse the sign of the static spin Hall conductivity.",2210.10531v1
+2023-03-16,Ultrafast dynamics of electrons excited by femtosecond laser pulses: spin polarization and spin-polarized currents,"Laser radiation incident on a ferromagnetic sample produces excited electrons
+and currents whose spin polarization must not be aligned with the magnetization
+-- an effect due to spin-orbit coupling that is ubiquitous in spin- and
+angle-resolved photoemission. In this Paper, we report on a systematic
+investigation of the dynamics of spin polarization and spin-polarized currents
+produced by femtosecond laser pulses, modeled within our theoretical framework
+EVOLVE. The spin polarization depends strongly on the properties of the laser
+pulse and on the sample composition, as is shown by comparing results for
+Cu(100), Co(100), and a Co/Cu heterostructure. We find a transition from
+coherence before the laser pulse's maximum to incoherence thereafter. Moreover,
+the time dependence of the spin-polarization components induced by spin-orbit
+coupling differ significantly in Cu and Co: in Cu, we find long-period
+oscillations with tiny rapid modulations, whereas in Co prominent rapid
+oscillations with long period ones are superimposed. The pronounced spatial
+dependencies of the signals underline the importance of inhomogeneities, in
+particular magnetic/non-magnetic interfaces `act as source' for ultrafast
+spin-polarization effects. Our investigation provides detailed insight into
+electron dynamics during and shortly after a femtosecond laser excitation.",2303.09291v1
+2005-06-14,"Orbital order, anisotropic spin couplings, and the spin-wave spectrum of the ferromagnetic Mott insulator YTiO3","Using a point-charge calculation of the electrostatic crystal field, we
+determine the non-degenerate orbital ground state of the ferromagnetic Mott
+insulator YTiO3, which is found to agree perfectly with experiment. Based on
+the orbital order, we obtain by perturbation theory an effective spin
+Hamiltonian that describes the magnetic superexchange between nearest-neighbor
+Ti ions. The superexchange Hamiltonian includes, in addition to the isotropic
+Heisenberg coupling, antisymmetric (Dzyaloshinskii-Moriya) and symmetric
+anisotropy terms, caused by the spin-orbit interaction on the Ti ions. We find
+ferromagnetic Heisenberg couplings for Ti-Ti bonds in the crystallographic ab
+planes, but antiferromagnetic ones for Ti-Ti bonds between planes, in
+contradiction with experiment (which gives ferromagnetic couplings for both).
+Difficulties in calculating realistic values for the isotropic couplings of
+YTiO3 have been already reported in the literature. We discuss possible origins
+for these discrepancies. However, the much smaller values we obtain for the
+symmetric and antisymmetric anisotropies may be expected to be reliable. We
+therefore combine the experimentally-deduced isotropic coupling with the
+calculated anisotropic ones to determine the magnetic order of the Ti ions,
+which is found to be in satisfactory agreement with experiment. Based on this
+magnetic order, we derive the spin-wave spectrum. We find an acoustic branch
+with a very small zone-center gap and three optical spin-wave modes with
+sizeable zone-center gaps. The acoustic branch reproduces the one reported in
+experiment, and the optical ones are in a satisfactory agreement with
+experiment, upon a proper folding of the magnetic Brillouin zone.",0506328v1
+2022-03-16,Theoretical analysis of single-ion anisotropy in $d^3$ Mott insulators,"An effective spin model for Mott insulators is determined by the symmetries
+involved among magnetic sites, electron fillings, and their interactions. Such
+a spin Hamiltonian offers insight to mechanisms of magnetic orders and magnetic
+anisotropy beyond the Heisenberg model. For a spin moment S bigger than 1/2,
+single-ion anisotropy is in principle allowed. However, for $d^3$ Mott
+insulators with large cubic crystal field splitting, the single-ion anisotropy
+is absent within the LS coupling, despite S = 3/2 local moment. On the other
+hand, preferred magnetic moment directions in $d^3$ materials have been
+reported, which calls for a further theoretical investigation. Here we derive
+the single-ion anisotropy interaction using the strong-coupling perturbation
+theory. The cubic crystal field splitting including $e_g$ orbitals, trigonal
+distortions, Hund's coupling, and spin-orbit coupling beyond the LS scheme are
+taken into account. For compressed distortion, the spin-orbit coupling at
+magnetic sites can favor either the easy-axis or the easy-plane while that of
+anions leads to easy-axis anisotropy. We apply the theory on $\rm{CrX}_3$ with
+X = Cl and I, and show the dependence of the single-ion anisotropy on the
+strength of the spin-orbit couplings of both magnetic and anion sites.
+Significance of the single-ion anisotropy in ideal two-dimensional magnets is
+also discussed.",2203.08836v3
+2014-03-19,Observation of two-orbital spin-exchange interactions with ultracold SU(N)-symmetric fermions,"We report on the direct observation of spin-exchanging interactions in a
+two-orbital SU(N)-symmetric quantum gas of ytterbium in an optical lattice. The
+two orbital states are represented by two different (meta-)stable electronic
+configurations of fermionic Yb-173. A strong spin-exchange between particles in
+the two separate orbitals is mediated by the contact interaction between atoms,
+which we characterize by clock shift spectroscopy in a 3D optical lattice. We
+find the system to be SU(N)-symmetric within our measurement precision and
+characterize all relevant scattering channels for atom pairs in combinations of
+the ground and the excited state. Elastic scattering between the orbitals is
+dominated by the antisymmetric channel, which leads to the strong spin-exchange
+coupling. The exchange process is directly observed, by characterizing the
+dynamic equilibration of spin imbalances between two large ensembles in the two
+orbital states, as well as indirectly in atom pairs via interaction shift
+spectroscopy in a 3D lattice. The realization of a stable SU(N)-symmetric
+two-orbital Hubbard Hamiltonian opens the route towards experimental quantum
+simulation of condensed-matter models based on orbital interactions, such as
+the Kondo lattice model.",1403.4761v3
+2017-11-27,"Emergent odd-parity multipoles and magnetoelectric effects on a diamond structure: implication to 5$d$ transition metal oxides $A$OsO$_4$ ($A=$ K, Rb, and Cs)","We report our theoretical predictions on the linear magnetoelectric (ME)
+effects originating from odd-parity multipoles associated with spontaneous spin
+and orbital ordering on a diamond structure. We derive a two-orbital model for
+$d$ electrons in $e_g$ orbitals by including the effective spin-orbit coupling
+which arises from the mixing between $e_g$ and $t_{2g}$ orbitals. We show that
+the model acquires a net antisymmetric spin-orbit coupling once staggered spin
+and orbital orders occur spontaneously. The staggered orders are accompanied by
+odd-parity multipoles: magnetic monopole, quadrupoles, and toroidal dipoles. We
+classify the types of the odd-parity multipoles according to the symmetry of
+the spin and orbital orders. Furthermore, by computing the ME tensor using the
+linear response theory, we show that the staggered orders induce a variety of
+the linear ME responses. We elaborate all possible ME responses for each
+staggered order, which are useful to identify the order parameter and to detect
+the odd-parity multipoles by measuring the ME effects. We also elucidate the
+effect of lowering symmetry by a tetragonal distortion, which leads to richer
+ME responses. The implications of our results are discussed for $5d$ transition
+metal oxides, $A$OsO$_4$ ($A=$ K, Rb, and Cs), in which the order parameters
+are not fully identified.",1711.09507v1
+2007-07-11,Electrical control of spin relaxation in a quantum dot,"We demonstrate electrical control of the spin relaxation time T_1 between
+Zeeman split spin states of a single electron in a lateral quantum dot. We find
+that relaxation is mediated by the spin-orbit interaction, and by manipulating
+the orbital states of the dot using gate voltages we vary the relaxation rate
+W= (T_1)^-1 by over an order of magnitude. The dependence of W on orbital
+confinement agrees with theoretical predictions and from these data we extract
+the spin-orbit length. We also measure the dependence of W on magnetic field
+and demonstrate that spin-orbit mediated coupling to phonons is the dominant
+relaxation mechanism down to 1T, where T_1 exceeds 1s.",0707.1656v1
+2011-03-05,Orbital elementary excitations as probes of entanglement and quantum phase transitions of collective spins in an entangled Bose-Einstein condensate,"A mixture of two species of pseudospin-1/2 Bose gases exhibits interesting
+interplay between spin and orbital degrees of freedom. Expectation values of
+various quantities of the collective spins of the two species play crucial
+roles in the Gross-Pitaevskii-like equations governing the four orbital wave
+functions in which Bose-Einstein condensation occurs. Consequently, the
+elementary excitations of these orbital wave functions reflect properties of
+the collective spins. When the coupling between the two collective spins is
+isotropic, the energy gap of the gapped orbital excitation peaks, while there
+is a quantum phase transition in the ground state of the effective Hamiltonian
+of the two collective spins, which have previously been found to be maximally
+entangled.",1103.1022v1
+2019-05-16,Electrical control of spins and giant g-factors in ring-like coupled quantum dots,"Emerging theoretical concepts for quantum technologies have driven a
+continuous search for structures where a quantum state, such as spin, can be
+manipulated efficiently. Central to many concepts is the ability to control a
+system by electric and magnetic fields, relying on strong spin-orbit
+interaction and a large g-factor. Here, we present a new mechanism for spin and
+orbital manipulation using small electric and magnetic fields. By hybridizing
+specific quantum dot states at two points inside InAs nanowires, nearly perfect
+quantum rings form. Large and highly anisotropic effective g-factors are
+observed, explained by a strong orbital contribution. Importantly, we find that
+the orbital and spin-orbital contributions can be efficiently quenched by
+simply detuning the individual quantum dot levels with an electric field. In
+this way, we demonstrate not only control of the effective g-factor from 80 to
+almost 0 for the same charge state, but also electrostatic change of the ground
+state spin.",1905.06616v1
+2014-03-10,Thermoelectric effects in graphene with local spin-orbit interaction,"We investigate the transport properties of a graphene layer in the presence
+of Rashba spin-orbit interaction. Quite generally, spin-orbit interactions
+induce spin splittings and modifications of the graphene bandstructure. We
+calculate within the scattering approach the linear electric and thermoelectric
+responses of a clean sample when the Rashba coupling is localized around a
+finite region. We find that the thermoelectric conductance, unlike its electric
+counterpart, is quite sensitive to external modulations of the Fermi energy.
+Therefore, our results suggest that thermocurrent measurements may serve as a
+useful tool to detect nonhomogeneous spin-orbit interactions present in a
+graphene-based device. Furthermore, we find that the junction thermopower is
+largely dominated by an intrinsic term independently of the spin-orbit
+potential scattering. We discuss the possibility of cancelling the intrinsic
+thermopower by resolving the Seebeck coefficient in the subband space. This
+causes unbalanced populations of electronic modes which can be tuned with
+external gate voltages or applied temperature biases.",1403.2178v2
+2012-01-30,"Exchange constants and spin waves of the orbital ordered, non-collinear spinel MnV$_2$O$_4$","We study the exchange constants of MnV$_2$O$_4$ using magnetic force theorem
+and local spin density approximation of density functional theory supplemented
+with a correction due to on-site Hubbard interaction U. We obtain the exchanges
+for three different orbital orderings of the Vanadium atoms of the spinel. We
+then map the exchange constants to a Heisenberg model with single-ion
+anisotropy and solve for the spin-wave excitations in the non-collinear, low
+temperature phase of the spinel. The single-ion anisotropy parameters are
+obtained from an atomic multiplet exact-diagonalization program, taking into
+effect the crystal-field splitting and the spin-orbit coupling. We find good
+agreement between the spin waves of one of our orbital ordered setups with
+previously reported experimental spin waves as determined by neutron
+scattering. We can therefore determine the correct orbital order from various
+proposals that exist in the literature.",1201.6375v2
+2017-07-12,Tunability of Andreev levels via spin-orbit coupling in Zeeman-split Josephson junctions,"We study Andreev reflection and Andreev levels $\varepsilon$ in Zeeman-split
+superconductor/Rashba wire/Zeeman-split superconductor junctions by solving the
+Bogoliubov de-Gennes equation. We theoretically demonstrate that the Andreev
+levels $\varepsilon$ can be controlled by tuning either the strength of Rashba
+spin-orbit interaction or the relative direction of the Rashba spin-orbit
+interaction and the Zeeman field. In particular, it is found that the magnitude
+of the band splitting is tunable by the strength of the Rashba spin-orbit
+interaction and the rength of the wire, which can be interpreted by a spin
+precession in the Rashba wire. We also find that if the Zeeman field in the
+superconductor has the component parallel to the direction of the junction, the
+$\varepsilon$-$\phi$ curve becomes asymmetric with respect to the
+superconducting phase difference $\phi$. Whereas the Andreev reflection
+processes associated with each pseudospin band are sensitive to the relative
+orientation of the spin-orbit field and the exchange field, the total electric
+conductance interestingly remains invariant.",1707.03723v2
+2021-07-05,Imaging chiral Andreev reflection in the presence of Rashba spin-orbit coupling,"In this work, we theoretically study transverse magnetic focusing in a
+two-dimensional electron gas with strong Rashba spin-orbit interaction when
+proximitized along its edge with a superconducting contact. The presence of
+superconducting correlations leads to the emergence of chiral Andreev edge
+states which -- within this weak magnetic field regime -- may be pictured as
+states following semiclassical skipping orbits with alternating electron-hole
+nature. The spin-orbit induced splitting of the Fermi surface causes these
+carriers to move along cyclotron orbits with different radii, allowing for
+their spatial spin separation. When Andreev reflection takes place at the
+superconducting lead, scattered carriers flip both their charge and spin,
+generating distinguishable features in the transport properties of the device.
+In particular, we report a notable enhancement of the separation between the
+spin-split focal points, which scales linearly with the number of Andreev
+scattering events at the anomalous terminal. We support our results by
+calculating conductance maps to arbitrary points in the sample that provide a
+complete image of the ballistic electron-hole cyclotron paths.",2107.02188v1
+2023-07-10,Angular dependence of spin-orbit torque in monolayer $Fe_3GeTe_2$,"In ferromagnetic systems lacking inversion symmetry, an applied electric
+field can control the ferromagnetic order parameters through the spin-orbit
+torque. The prototypical example is a bilayer heterostructure composed of a
+ferromagnet and a heavy metal that acts as a spin current source. In addition
+to such bilayers, spin-orbit coupling can mediate spin-orbit torques in
+ferromagnets that lack bulk inversion symmetry. A recently discovered example
+is the two-dimensional monolayer ferromagnet $Fe_3GeTe_2$. In this work, we use
+first-principles calculations to study the spin-orbit torque and ensuing
+magnetic dynamics in this material. By expanding the torque versus
+magnetization direction as a series of vector spherical harmonics, we find that
+higher order terms (up to $\ell=4$) are significant and play important roles in
+the magnetic dynamics. They give rise to deterministic, magnetic field-free
+electrical switching of perpendicular magnetization.",2307.04900v2
+2020-04-24,Quantitative comparison of electrically induced spin and orbital polarizations in heavy-metal/3d-metal bilayers,"Electrical control of magnetization is of crucial importance for integrated
+spintronics devices. Spin-orbit torques (SOT) in heavy-metal/ferromagnetic
+heterostructures have emerged as promising tool to achieve efficiently
+current-induced magnetization reversal. However, the microscopic origin of the
+SOT is being debated,with the spin Hall effect (SHE) due to nonlocal spin
+currents and the spin Rashba-Edelstein effect (SREE) due to local spin
+polarization at the interface being the primary candidates. We investigate the
+electrically induced out-of-equilibrium spin and orbital polarizations in pure
+Pt films and in Pt/3d-metal (Co, Ni, Cu) bilayer films using ab initio
+electronic structure methods and linear-response theory. We compute
+atom-resolved response quantities that allow us to identify the induced
+spin-polarization contributions that lead to fieldlike SOTs, mostly associated
+with the SREE, and dampinglike (DL) SOTs, mostly associated with the SHE, and
+compare their relative magnitude, dependence on the magnetization direction, as
+well as their Pt-layer thickness dependence. We find that both the FL and DL
+components contribute to the resulting SOT at the Pt/Co and Pt/Ni interfaces,
+with the former contributions being larger at the Pt interface layer and the
+latter larger in the Co or Ni layers. Our calculations show that the
+electrically-induced transverse orbital polarization is exceedingly larger than
+the induced spin polarization and present even without spin-orbit coupling, in
+contrast to the spin polarization.",2004.11942v5
+2019-04-01,X-ray spectroscopy of current-induced spin-orbit torques and spin accumulation in Pt/3d transition metal bilayers,"An electric current flowing in Pt, a material with strong spin-orbit
+coupling, leads to spins accumulating at the interfaces by virtue of the spin
+Hall effect and interfacial charge-spin conversion. We measure the influence of
+these interfacial magnetic moments onto adjacent 3d transition metal layers by
+x-ray absorption spectroscopy and x-ray magnetic circular dichroism in a
+quantitative and element-selective way, with sensitivity below $10^{-5}~\mu_B$
+per atom. In Pt(6 nm)/Co(2.5 nm), the accumulated spins cause a deviation of
+the Co magnetization direction, which corresponds to an effective spin-Hall
+angle of 0.08. The spin and orbital magnetic moments of Co are affected in
+equal proportion by the absorption of the spin current, showing that the
+transfer of orbital momentum from the recently predicted orbital Hall effect is
+either below our detection limit, or not directed to the 3d states of Co. For
+Pt/NM (NM = Ti, Cr, Cu), we find upper limits for the amount of injected spins
+corresponding to about $3\times 10^{-6}~\mu_B$ per atom.",1904.00877v2
+2022-09-06,Spin-filtering in a $p$-orbital helical atomic chain,"We theoretically analyze spin filtering in two-terminal systems, induced by
+the spin-orbit interaction (SOI), as a possible origin of the
+``chirality-induced spin selectivity'' (CISS) effect observed experimentally in
+chiral molecules, such as DNA. Due to Bardarson's theorem, spin filtering
+cannot be realized in a molecule containing one orbital-channel. However, when
+two orbitals are involved, SOI can induce spin filtering in a molecule coupled
+to two terminals without braking time-reversal symmetry. In particular, we
+provide an example of a $4 \times 4$ reflection matrix for a spinful electron
+passing through a molecule containing two orbital-channels, which complies with
+Bardarson's theorem and produces a finite spin conductance. As a microscopic
+toy model realizing a single strand of DNA, we consider a $p$-orbital helical
+atomic chain with intra-atomic SOI's and a strong crystalline field along the
+helix. This model exhibits two-orbital spin filtering: For various parameters
+preserving the helical symmetry, the model hosts spin asymmetric states
+carrying pairs of up and down spins propagating in opposite directions. The
+typical energy scale of the helical states is the product of the intra-atomic
+SOI and the curvature. The large value of this energy identifies our model as a
+likely candidate to explain the CISS in organic molecules.",2209.02303v1
+2023-11-21,Proximity-enabled control of spin-orbit coupling in phosphorene symmetrically and asymmetrically encapsulated by WSe$_2$ monolayers,"We analyze, using first-principles calculations and the method of invariants,
+the spin-orbit proximity effects in trilayer heterostructures comprising
+phosphorene and encapsulating WSe$_2$ monolayers. We focus on four different
+configurations, in which the top/bottom WSe$_2$ monolayer is twisted by 0 or 60
+degrees with respect to phosphorene, and analyze the spin splitting of
+phosphorene hole bands around the $\Gamma$ point. Our results show that the
+spin texture of phosphorene hole bands can be dramatically modified by
+different encapsulations of phosphorene monolayer. For a symmetrically
+encapsulated phosphorene, the momentum-dependent spin-orbit field has the
+out-of-plane component only, simulating the spin texture of phosphorene-like
+group-IV monochalcogenide ferroelectrics. Furthermore, we reveal that the
+direction of the out-of-plane spin-orbit field can be controlled by switching
+the twist angle from 0 to 60 degrees. Finally, we show that the spin texture in
+asymmetrically encapsulated phosphorene has the dominant in-plane component of
+the spin-orbit field, comparable to the Rashba effect in phosphorene with an
+applied sizable external electric field. Our results confirm that the
+significant modification and control of the spin texture is possible in low
+common-symmetry heterostructures, paving the way for using different substrates
+to modify spin properties in materials important for spintronics.",2311.12463v2
+2009-05-07,"Regarding Llewellyn Thomas's paper of 1927 and the ""hidden momentum"" of a magnetic dipole in an electric field","L. H. Thomas, in his 1927 paper, ""The Kinematics of an Electron with an
+Axis"", explained the then-anomalous factor of one-half in atomic spin-orbit
+coupling as due to a relativistic precession of the electron spin axis.
+Thomas's explanation required also that the total of the orbit-averaged, or
+""secular"", orbital and spin angular momenta of the electron be a conserved
+quantity, as he found to be the case for either of two possible equations of
+translational motion of the magnetic electron. Thomas's finding is seen in the
+present work to require the ""hidden momentum"" of the electron intrinsic
+magnetic moment in the Coulomb field of the proton be omitted from its equation
+of translational motion. Omission of the hidden momentum is contrary to the
+position of standard modern electrodynamics texts, and leads to violation of
+Newton's law of action and reaction, negating Thomas's result. Including the
+hidden momentum results in linear momentum conservation, but in the presence of
+Thomas precession, the total angular momentum is not generally conserved. The
+total angular momentum precesses for non-aligned spin and orbit, even in the
+absence of externally-applied magnetic field. As Thomas observes that secular
+angular momentum conservation is a necessary condition for a consistent
+simultaneous description of spin-orbit coupling and the anomalous Zeeman
+effect, such is not possible within classical electrodynamics in its absence.",0905.0927v4
+2002-09-30,Datta-Das transistor with enhanced spin control,"We consider a two-channel spin transistor with weak spin-orbit induced
+interband coupling. We show that the coherent transfer of carriers between the
+coupled channels gives rise to an \textit{additional} spin rotation. We
+calculate the corresponding spin-resolved current in a Datta-Das geometry and
+show that a weak interband mixing leads to enhanced spin control.",0209682v2
+2005-12-30,Kondo effect and spin filtering in coupled quantum dots,"The coherent transport through a set of N quantum dots coupled in parallel is
+considered in the limit of infinite intradot and finite or infinite interdot
+interactions. The mean field slave boson approach and the equation of motion
+method are used. For the full spin-orbit degenerate case the low energy
+behavior is characterized by an SU(2N) symmetry with entangled spin and charge
+correlations. The magnetic field breaks the spin degeneracy, but for the
+special choices of gate voltages the degeneracy might be recovered in one spin
+channel allowing the spin filtering.",0512720v1
+2007-01-03,Suppression of spin relaxation in an InAs nanowire double quantum dot,"We investigate the triplet-singlet relaxation in a double quantum dot defined
+by top-gates in an InAs nanowire. In the Pauli spin blockade regime, the
+leakage current can be mainly attributed to spin relaxation. While at weak and
+strong inter-dot coupling relaxation is dominated by two individual mechanisms,
+the relaxation is strongly reduced at intermediate coupling and finite magnetic
+field. In addition we observe a charateristic bistability of the spin-non
+conserving current as a function of magnetic field. We propose a model where
+these features are explained by the polarization of nuclear spins enabled by
+the interplay between hyperfine and spin-orbit mediated relaxation.",0701054v1
+2007-04-28,Spin filtering implemented through Rashba and weak magnetic modulations,"We present two theoretical schemes for spin filters in one-dimensional
+semiconductor quantum wires with spatially modulated Rashba spin-orbit coupling
+(SOC) as well as weak magnetic potential. For case I, the SOC is periodic and
+the weak magnetic potential is applied uniformly along the wire. Full spin
+polarizations with opposite signs are obtained within two separated energy
+intervals. For case II, the weak magnetic potential is periodic while the SOC
+is uniform. An ideal negative/positive switching effect for spin polarization
+is realized by tuning the strength of SOC. The roles of SOC, magnetic
+potential, and their coupling on the spin filtering are analyzed.",0704.3799v1
+2007-12-17,Field-induced spin excitations in Rashba-Dresselhaus two-dimensional electron systems probed by surface acoustic waves,"A spin-rotation symmetry in spin-orbit coupled two-dimensional electron
+systems gives rise to a long-lived spin excitation that is robust against
+short-range impurity scattering. The influence of a constant in-plane electric
+field on this persistent spin helix is studied. To probe the field-induced
+eigen-modes of the spin-charge coupled system, a surface acoustic wave is
+exploited that provides the wave-vector for resonant excitation. The approach
+takes advantage of methods worked out in the field of space-charge waves. Sharp
+resonances in the field dependence of the in-plane and out-of-plane
+magnetization are identified.",0712.2647v1
+2008-04-09,Electric field control of spin-orbit splittings in GaAs/AlGaAs coupled quantum wells,"Electron spin dynamics is investigated in n-i-n GaAs/AlGaAs coupled quantum
+wells. The electron spin dephasing time is measured as a function of an
+external electrical bias under resonant excitation of the 1sHH intrawell
+exciton using a time-resolved Kerr rotation technique. It is found a strong
+electron spin dephasing time anisotropy caused by an interference of the
+structure inversion asymmetry and the bulk inversion asymmetry. This anisotropy
+is shown to be controlled by an electrical bias. A theoretical analysis of
+electron spin dephasing time anisotropy is developed. The ratio of Rashba and
+Dresselhaus spin splittings is studied as a function of applied bias.",0804.1483v1
+2010-01-21,Spin Dependent Joule Heating due to Rashba Coupling and Zitterbewegung,"Investigating microwave absorption in asymmetric Si quantum wells in an
+external magnetic field, we discover a spin dependent component of Joule
+heating at spin resonance. We explain this effect in terms of Rashba spin-orbit
+coupling which results in a current induced spin precession and Zitterbewegung.
+Evidence is based on the observation of a specific dependence of the electron
+spin resonance line shape and its amplitude on the experimental geometry which
+in some range suggests a ""negative"" differential power absorption.",1001.3746v2
+2011-08-24,Current-Conserving Aharonov-Bohm Interferometry with Arbitrary Spin Interactions,"We propose a general scattering matrix formalism that guarantees the charge
+conservation at junctions between conducting arms with arbitrary spin
+interactions. By using our formalism, we find that the spin-flip scattering can
+happen even at nonmagnetic junctions if the spin eigenstates in arms are not
+orthogonal. We apply our formalism to the Aharonov-Bohm interferometer
+consisting of $n$-type semiconductor ring with both the Rashba spin-orbit
+coupling and the Zeeman splitting. We discuss the characteristics of the
+interferometer as conditional/unconditional spin switch in the
+weak/strong-coupling limit, respectively.",1108.4775v1
+2023-10-17,Optical Regulation of Chiral-Induced Spin Selectivity,"We present a non-perturbative theory that describes how light regulates
+chiral-induced spin selectivity (CISS) from the perspective of strong
+light-matter interactions. The research results indicate that 1) light can have
+opposite effects on the CISS, 2) the difference in CISS is caused by the steady
+states of nuclei coupled to spin electrons and 3) this steady state differences
+are caused by the different light-induced Lorentz forces felt by spin-up and
+spin-down electrons. The fundamental reason for these results is the impact of
+light on spin-orbital coupling (SOC), which is a complex process. This
+theoretical framework is verified by the calculations of Floquet SOC
+non-adiabatic nuclear dynamics.",2310.10929v1
+2023-10-26,Gravitational Spin Hall Effect of Dirac Particle and the Weak Equivalence Principle,"We present a spin-induced none-geodesic effect of Dirac wave packets in a
+static uniform gravitational field. Our approach is based on the
+Foldy-Wouthuysen transformation of Dirac equation in a curved spacetime, which
+predicts the gravitational spin-orbit coupling. Due to this coupling, we find
+that the dynamics of the free-fall Dirac wave packets with opposite spin
+polarization will yield the transverse splitting in the direction perpendicular
+to spin orientation and gravity, which is known as the gravitational spin Hall
+effect. Even in a static uniform gravitational field, such effect suggests that
+the weak equivalence principle is violated for quantum particles.",2310.17581v1
+2019-04-02,Nematic-orbit coupling and nematic density waves in spin-1 condensates,"We propose the creation of artificial nematic-orbit coupling in spin-1
+Bose-Einstein condensates, in analogy to spin-orbit coupling. Using a suitably
+designed microwave chip, the quadratic Zeeman shift, normally uniform in space,
+can be made to be spatio-temporally varying, leading to a coupling between
+spatial and nematic degrees of freedom. A phase diagram is explored where three
+quantum phases with the nematic order emerge: easy-axis, easy-plane with
+single-well and easy-plane with double well structure in momentum space. By
+including spin-dependent and spin-independent interactions, we also obtain the
+low energy excitation spectra in these three phases. Lastly, we show that the
+nematic-orbit coupling leads to a periodic nematic density modulation in
+relation to the period $\lambda_T$ of the cosinusoidal quadratic Zeeman term.
+Our results point to the rich possibilities for manipulation of tensorial
+degrees of freedom in ultracold gases without requiring Raman lasers, and
+therefore, obviating light-scattering induced heating.",1904.01635v2
+2020-06-16,Generating Giant Vortex in a Fermi Superfluid via Spin-Orbital-Angular-Momentum Coupling,"Spin-orbital-angular-momentum (SOAM) coupling has been realized in recent
+experiments of Bose-Einstein condensates [Chen et al., Phys. Rev. Lett. 121,
+113204 (2018) and Zhang et al., Phys. Rev. Lett. 122, 110402 (2019)], where the
+orbital angular momentum imprinted upon bosons leads to quantized vortices. For
+fermions, such an exotic synthetic gauge field can provide fertile ground for
+fascinating pairing schemes and rich superfluid phases, which are yet to be
+explored. Here we demonstrate how SOAM coupling stabilizes vortices in Fermi
+superfluids through a unique mechanism that can be viewed as the angular analog
+to that of the spin-orbit-coupling-induced Fulde-Ferrell state under a Fermi
+surface deformation. Remarkably, the vortex size is comparable with the beam
+waist of Raman lasers generating the SOAM coupling, which is typically much
+larger than previously observed vortices in Fermi superfluids. With tunable
+size and core structure, these giant vortex states provide unprecedented
+experimental access to topological defects in Fermi superfluids.",2006.08898v2
+2022-05-17,Charge to Spin Conversion in van der Waals Metal NbSe2,"Quantum materials with a large charge current-induced spin polarization are
+promising for next-generation all-electrical spintronic science and technology.
+Van der Waals metals with high spin-orbit coupling and novel spin textures have
+attracted significant attention for an efficient charge to spin conversion
+process. Here, we demonstrate the electrical generation of spin polarization in
+NbSe2 up to room temperature. To probe the current-induced spin polarization in
+NbSe2, we used a graphene-based non-local spin-valve device, where the
+spin-polarization in NbSe2 is efficiently injected and detected using non-local
+spin-switch and Hanle spin precession measurements. A significantly higher
+charge-spin conversion in NbSe2 is observed at a lower temperature, below the
+superconducting transition temperature Tc ~ 7 K of NbSe2. However, the
+charge-spin conversion signal could only be observed with a higher bias current
+above the superconducting critical current, limiting the observation of the
+signal only to the non-superconducting state of NbSe2. Systematic measurements
+provide the possible origins of the spin polarization to be predominantly due
+to the spin Hall effect or Rashba-Edelstein effect in NbSe2, considering
+different symmetry allowed charge-spin conversion processes.",2205.08327v1
+2022-07-29,Unusual Spin Polarization in the Chirality Induced Spin Selectivity,"Chirality-induced spin selectivity (CISS) refers to the fact that electrons
+get spin polarized after passing through organic chiral molecules in a
+nanoscale device. In CISS, chiral molecules are commonly believed to be a spin
+filter through which one favored spin transmits and the opposite spin gets
+reflected, i.e., transmitted and reflected electrons exhibit opposite spin
+polarization. In this work, we point out that such a spin filter scenario
+contradicts the principle that equilibrium spin current must vanish. Instead,
+we find that both transmitted and reflected electrons present the same type
+spin polarization, which is actually ubiquitous for a two-terminal device. More
+accurately, chiral molecules play the role of a spin polarizer rather than a
+spin filter. The direction of spin polarization is determined by the molecule
+chirality and the electron incident direction. And the magnitude of spin
+polarization replies on local spin-orbit coupling in the device. Our work
+brings a deeper understanding on CISS and interprets recent experiments, for
+example, the CISS-driven anomalous Hall effect.",2208.00043v2
+2005-03-17,Transverse Spin-Orbit Force in the Spin Hall Effect in Ballistic Semiconductor Wires,"We introduce the spin and momentum dependent {\em force operator} which is
+defined by the Hamiltonian of a {\em clean} semiconductor quantum wire with
+homogeneous Rashba spin-orbit (SO) coupling attached to two ideal (i.e., free
+of spin and charge interactions) leads. Its expectation value in the
+spin-polarized electronic wave packet injected through the leads explains why
+the center of the packet gets deflected in the transverse direction. Moreover,
+the corresponding {\em spin density} will be dragged along the transverse
+direction to generate an out-of-plane spin accumulation of opposite signs on
+the lateral edges of the wire, as expected in the phenomenology of the spin
+Hall effect, when spin-$\uparrow$ and spin-$\downarrow$ polarized packets
+(mimicking the injection of conventional unpolarized charge current) propagate
+simultaneously through the wire. We also demonstrate that spin coherence of the
+injected spin-polarized wave packet will gradually diminish (thereby
+diminishing the ``force'') along the SO coupled wire due to the entanglement of
+spin and orbital degrees of freedom of a single electron, even in the absence
+of any impurity scattering.",0503415v2
+2016-03-30,Rashba-type Spin-orbit Coupling in Bilayer Bose-Einstein Condensates,"We explore a new way of producing the Rashba spin-orbit coupling (SOC) for
+ultracold atoms by using a two-component (spinor) atomic Bose-Einstein
+condensate (BEC) confined in a bilayer geometry. The SOC of the Rashba type is
+created if the atoms pick up a {\pi} phase after completing a cyclic transition
+between four combined spin-layer states composed of two spin and two layer
+states. The cyclic coupling of the spin-layer states is carried out by
+combining an intralayer Raman coupling and an interlayer laser assisted
+tunneling. We theoretically determine the ground-state phases of the
+spin-orbit-coupled BEC for various strengths of the atom-atom interaction and
+the laser-assisted coupling. It is shown that the bilayer scheme provides a
+diverse ground-state phase diagram. In an intermediate range of the atom-light
+coupling two interlacing lattices of half- skyrmions and half-antiskyrmions are
+spontaneously created. In the strong-coupling regime, where the SOC of the
+Rashba-type is formed, the ground state represents plane-wave or standing-wave
+phases depending on the interaction between the atoms. A variational analysis
+is shown to be in a good agreement with the numerical results.",1603.09043v2
+2019-09-18,Dzyaloshinskii-Moriya coupling in 3d insulators,"We present an overview of the microscopic theory of the Dzyaloshinskii-Moriya
+(DM) coupling in strongly correlated 3d compounds. Most attention in the paper
+centers around the derivation of the Dzyaloshinskii vector, its value,
+orientation, and sense (sign) under different types of the (super)exchange
+interaction and crystal field. We consider both the Moriya mechanism of the
+antisymmetric interaction and novel contributions, in particular, that of
+spin-orbital coupling on the intermediate ligand ions. We have predicted a
+novel magnetic phenomenon, {\it weak ferrimagnetism} in mixed weak ferromagnets
+with competing signs of the Dzyaloshinskii vectors.
+  We revisit a problem of the DM coupling for a single bond in cuprates
+specifying the local spin-orbital contributions to Dzyaloshinskii vector
+focusing on the oxygen term. We predict a novel puzzling effect of the on-site
+staggered spin polarization to be a result of the on-site spin-orbital coupling
+and the the cation-ligand spin density transfer. The intermediate ligand NMR
+measurements are shown to be an effective tool to inspect the effects of the DM
+coupling in an external magnetic field. We predict the effect of a $strong$
+oxygen weak antiferromagnetism in edge-shared CuO$_2$ chains due to
+uncompensated oxygen Dzyaloshinskii vectors. We revisit the effects of
+symmetric spin anisotropy directly induced by the DM coupling. A critical
+analysis will be given of different approaches to exchange-relativistic
+coupling based on the cluster and the DFT based calculations. Theoretical
+results are applied to different classes of 3d compounds from conventional weak
+ferromagnets ($\alpha$-Fe$_2$O$_3$, FeBO$_3$, FeF$_3$, RFeO$_3$, RCrO$_3$,.. )
+to unconventional systems such as weak ferrimagnets (e.g.,
+RFe$_{1-x}$Cr$_x$O$_3$), helimagnets (e.g., CsCuCl$_3$), and parent cuprates
+(La$_2$CuO$_4$,...).",1909.08342v1
+2004-04-27,Orbital and spin correlations in Ca$_{2-x}$Sr$_x$RuO$_4$: A mean field study,"The alloy Ca$_{2-x}$Sr$_x$RuO$_4$ exhibits a complex phase diagram with
+peculiar magnetic metallic phases. In this paper some aspects of this alloy are
+discussed based on a mean field theory for an effective Kugel-Khomskii model of
+localized orbital and spin degrees of freedom. This model results from an
+orbital selective Mott transition which in the three-band system localized two
+orbitals while leaving the third one itinerant. Special attention is given to
+the region around a structure quantum phase transition at $ x \approx 0.5 $
+where the crystal lattice changes from tetragonal to orthorhombic symmetry
+while leaving the system metallic. This transition yields, a change from
+ferromagnetic to antiferromagnetic spin correlations. The complete mean field
+phase diagram for this transition is given including orbital and spin order.
+The anisotropy of spin susceptibility, a consequence of spin-orbit coupling and
+orbital correlation, is a tell-tale sign of one of these phases. In the
+predominantly antiferromagnetic phase we describe a metamagnetic transition in
+a magnetic field and show that coupling of the itinerant band to the localized
+degrees of freedom yields an anomalous longitudinal magnetoresistance
+transition. Both phenomena are connected with the evolution of the
+ferromagnetic and antiferromagnetic domains in the external magnetic field and
+agree qualitatively with the experimental findings.",0404661v1
+2015-09-27,A new effective-one-body Hamiltonian with next-to-leading order spin-spin coupling,"We present a new effective-one-body (EOB) Hamiltonian with next-to-leading
+order (NLO) spin-spin coupling for black hole binaries endowed with arbitrarily
+oriented spins. The Hamiltonian is based on the model for parallel spins and
+equatorial orbits developed in [Physical Review D 90, 044018 (2014)], but
+differs from it in several ways. In particular, the NLO spin-spin coupling is
+not incorporated by a redefinition of the centrifugal radius $r_c$, but by
+separately modifying certain sectors of the Hamiltonian, which are identified
+according to their dependence on the momentum vector. The gauge-fixing
+procedure we follow allows us to reduce the 25 different terms of the NLO
+spin-spin Hamiltonian in Arnowitt-Deser-Misner coordinates to only 9 EOB terms.
+This is an improvement with respect to the EOB model recently proposed in
+[Physical Review D 91, 064011 (2015)], where 12 EOB terms were involved.
+Another important advantage is the remarkably simple momentum structure of the
+spin-spin terms in the effective Hamiltonian, which is simply quadratic up to
+an overall square root. Moreover, a Damour-Jaranowski-Sch\""afer-type gauge
+could be established, thus allowing one to concentrate, in the case of circular
+and equatorial orbits, the whole spin-spin interaction in a single radial
+potential.",1509.08135v1
+2020-07-24,"Determination of the spin Hall angle, spin mixing conductance and spin diffusion length in Ir/CoFeB for spin-orbitronic devices","Iridium is a very promising material for spintronic applications due to its
+interesting magnetic properties such as large RKKY exchange coupling as well as
+its large spin-orbit coupling value. Ir is for instance used as a spacer layer
+for perpendicular synthetic antiferromagnetic or ferrimagnet systems. However,
+only a few studies of the spintronic parameters of this material have been
+reported. In this paper, we present inverse spin Hall effect - spin pumping
+ferromagnetic resonance measurements on CoFeB/Ir based bilayers to estimate the
+values of the effective spin Hall angle, the spin diffusion length within
+iridium, and the spin mixing conductance in the CoFeB/Ir bilayer. In order to
+have reliable results, we performed the same experiments on CoFeB/Pt bilayers,
+which behavior is well known due to numerous reported studies. Our experimental
+results show that the spin diffusion length within iridium is 1.3 nm for
+resistivity of 250 n$\Omega$.m, the spin mixing conductance $g_{eff}^{\uparrow
+\downarrow}$ of the CoFeB/Ir interface is 30 nm$^{-2}$, and the spin Hall angle
+of iridium has the same sign than the one of platinum and is evaluated at 26%
+of the one of platinum. The value of the spin Hall angle found is 7.7% for Pt
+and 2% for Ir. These relevant parameters shall be useful to consider Ir in new
+concepts and devices combining spin-orbit torque and spin-transfer torque.",2007.12413v1
+2019-09-03,Effects of spin-orbit coupling on spin-fluctuation induced pairing in iron-based superconductors,"We perform a theoretical study of the leading pairing instabilities and the
+associated superconducting gap functions within the spin-fluctuation mediated
+pairing scenario in the presence of spin-orbit coupling (SOC). Focussing on
+iron-based superconductors (FeSCs), our model Hamiltonian consists of a
+realistic density functional theory (DFT)-derived ten-band hopping term,
+spin-orbit coupling, and electron-electron interactions included via the
+multi-orbital Hubbard-Hund Hamiltonian. We perform an extensive parameter sweep
+and investigate different doping regimes including cases with only hole- or
+only electron Fermi pockets. In addition, we explore two different
+bandstructures: a rather generic band derived for LaFeAsO but known to
+represent standard DFT-obtained bands for iron-based superconductors, and a
+band specifically tailored for FeSe which exhibits a notably different Fermi
+surface compared to the generic case. It is found that for the generic FeSCs
+band, even rather large SOC has negligible effect on the resulting gap
+structure; the $s_{+-}$ (pseudo-)spin singlet pairing remains strongly favored
+and SOC does not lead to any SOC-characteristic gap oscillations along the
+various Fermi surfaces. By contrast in the strongly hole-doped case featuring
+only hole-pockets around the $\Gamma$-point, the leading solution is $d$-wave
+pseudo-spin singlet, but with a notable SOC-driven tendency towards helical
+pseudo-spin triplet pairing, which may even become the leading instability. In
+the heavily electron doped situation, featuring only electron pockets centered
+around the $M$-point, the leading superconducting instabilities are pseudo-spin
+singlets with SOC favoring the $s$-wave case as compared to $d$-wave pairing,
+which is the favored gap symmetry for vanishing SOC.",1909.01313v1
+2020-05-18,Pseudospin-electric coupling for holes beyond the envelope-function approximation,"In the envelope-function approximation, interband transitions produced by
+electric fields are neglected. However, electric fields may lead to a spatially
+local ($k$-independent) coupling of band (internal, pseudospin) degrees of
+freedom. Such a coupling exists between heavy-hole and light-hole (pseudo-)spin
+states for holes in III-V semiconductors, such as GaAs, or in group IV
+semiconductors (germanium, silicon, ...) with broken inversion symmetry. Here,
+we calculate the electric-dipole (pseudospin-electric) coupling for holes in
+GaAs from first principles. We find a transition dipole of $0.5$ debye, a
+significant fraction of that for the hydrogen-atom $1s\to2p$ transition. In
+addition, we derive the Dresselhaus spin-orbit coupling that is generated by
+this transition dipole for heavy holes in a triangular quantum well. A
+quantitative microscopic description of this pseudospin-electric coupling may
+be important for understanding the origin of spin splitting in quantum wells,
+spin coherence/relaxation ($T_2^*/T_1$) times, spin-electric coupling for
+cavity-QED, electric-dipole spin resonance, and spin non-conserving tunneling
+in double quantum dot systems.",2005.08821v2
+2018-09-07,Spin angular momentum in planar and cylindrical waveguides induced by transverse confinement and intrinsic helicity of guided light,"In recent years, extraordinary spin angular momenta have been investigated in
+a variety of structured electromagnetic waves, being of especial interest in
+sub-wavelength evanescent fields. Here we demonstrate analytically that, in
+planar and cylindrical waveguides supporting transverse electric/magnetic
+modes, transverse spin density arises inside the waveguide (different from the
+spin induced in the evanescent region outside the waveguide), carrying indeed
+longitudinal extraordinary (so-called) Belinfante's spin momentum. Such
+contribution depends linearly on the mode transverse wave vector, and is thus
+induced by mode confinement. Cylindrical waveguides support in addition hybrid
+modes that exhibit a richer phenomenology with not only azimuthal
+(confinement-related) spin, but also an intrinsic helicity which leads to
+longitudinal spin density and transverse helicity-dependent spin momentum.
+Results are indeed presented for configurations relevant to spin-orbit coupling
+in nanophotonic waveguides and to manipulating optical forces in
+IR-to-microwave water-filled channels. Thus guided modes intrinsically carrying
+confinement-induced transverse spin, combined with intrinsic-helicity-induced
+longitudinal spin (when hybrid), hold promise of superb devices to control
+spin-orbit interaction and optical forces within confined geometries throughout
+the electromagnetic spectra.",1809.02406v1
+2004-09-01,Spin-Hall Effect in Two-Dimensional Electron Systems with Rashba Spin-Orbit Coupling and Disorder,"Using the four-terminal Landauer-B\""{u}ttiker formula and Green's function
+approach, we calculate numerically the spin-Hall conductance in a
+two-dimensional junction system with the Rashba spin-orbit (SO) coupling and
+disorder. We find that the spin-Hall conductance can be much greater or smaller
+than the universal value $e/8\pi$, depending on the magnitude of the SO
+coupling, the electron Fermi energy and the disorder strength. The spin-Hall
+conductance does not vanish with increasing sample size for a wide range of
+disorder strength. Our numerical calculation reveals that a nonzero SO coupling
+can induce electron delocalization for disorder strength smaller than a
+critical value, and the nonvanishing spin-Hall effect appears mainly in the
+metallic regime.",0409038v3
+2011-12-02,Spin-dependent Klein tunneling in graphene: Role of Rashba spin-orbit coupling,"Within an effective Dirac theory the low-energy dispersions of monolayer
+graphene in the presence of Rashba spin-orbit coupling and spin-degenerate
+bilayer graphene are described by formally identical expressions. We explore
+implications of this correspondence for transport by choosing chiral tunneling
+through pn and pnp junctions as a concrete example. A real-space Green's
+function formalism based on a tight-binding model is adopted to perform the
+ballistic transport calculations, which cover and confirm previous theoretical
+results based on the Dirac theory. Chiral tunneling in monolayer graphene in
+the presence of Rashba coupling is shown to indeed behave like in bilayer
+graphene. Combined effects of a forbidden normal transmission and spin
+separation are observed within the single-band n to p transmission regime. The
+former comes from real-spin conservation, in analogy with pseudospin
+conservation in bilayer graphene, while the latter arises from the intrinsic
+spin-Hall mechanism of the Rashba coupling.",1112.0552v2
+2014-09-30,Collective modes in two- and three-dimensional electron systems with Rashba spin-orbit coupling,"In addition to charge plasmons, a 2D electron system with Rashba-type
+spin-orbit coupling (SOC) also supports three collective modes in the spin
+sector: the chiral-spin modes. We study the dispersions of the charge and spin
+modes and their coupling to each other within a generalized Random Phase
+Approximation for arbitrarily strong SOC, and both in 2D and 3D systems. In
+both 2D and 3D, we find that the charge plasmons are coupled to only one of the
+three chiral-spin modes. This coupling is shown to affect the dispersions of
+the modes at finite but not at zero wavenumbers. In 3D, the chiral-spin modes
+are strongly damped by particle-hole excitations and disappear for weak
+electron-electron interaction. Landau damping of the chiral-spin modes in 3D is
+directly related to the fact that, in contrast to 2D, there is no gap for
+particle-hole excitations between spin-split subbands. The gapless continuum is
+also responsible for Landau damping of the charge plasmon in 3D - a
+qualitatively new feature of the SOC system. We also discuss the optical
+conductivity of clean 2D and 3D systems and show that SOC introduces spectral
+weight at finite frequency in a such way that the sum rule is satisfied. The
+in-plane tranverse chiral-spin mode shows up as dispersing peak in the optical
+conductivity at finite number which can can be measured in the presence of
+diffraction grating. We also discuss possible experimental manifestations of
+chiral-spin modes in semiconductor quantum wells such InGaAs/AlGaAs and 3D
+giant Rashba materials of the BiTeI family.",1409.8666v1
+2021-10-01,Spin liquid in twisted homobilayers group-VI gichalcogenides,"Twisted transition metal dichalcogenide (TMD) homobilayers have recently
+emerged as a powerful platform for studying correlated insulating states. In
+the strongly correlated limit, we construct an effective spin Hamiltonian on a
+honeycomb lattice that includes the Heisenberg interaction and nonsymmetric
+interactions such as a Dzyaloshinskii-Moriya interaction and a Kane-Mele
+coupling for the Mott-insulating phase at half-filling. For the twisted TMD
+homobilayers, the spin-orbit coupling in the Hubbard model, which is expected
+to induce the antisymmetric exchange couplings in the effective spin
+Hamiltonian, is a highly tunable and experimentally accessible quantity that
+can be tuned by an applied electric field. In this study, we investigate
+classical and quantum phase diagrams of the effective spin Hamiltonian using
+analytical and numerical methods. We show that the model exhibits a rich
+classical phase diagram including an antiferromagnetic (AFM) phase, a planar
+spiral ordered phase with high classical degeneracy, a $z$-AFM phase, a
+noncoplanar phase, a noncollinear phase, and a 120$^{\circ}$-AFM phase. In the
+quantum treatment, we calculate low-energy magnon excitation spectrum, ground
+state energy, and static spin structure factor using linear spin-wave theory
+and density matrix renormalization group methods to compose the quantum phase
+diagram of the effective spin Hamiltonian. Beyond the Heisenberg interaction,
+we find that the existence of these antisymmetric couplings is responsible for
+the quantum spin liquid, $z$-AFM, noncoplanar, and 120$^{\circ}$ phases.
+Twisted TMD homobilayers, therefore, offer rich platforms for realizing rich
+phases of matter such as quantum spin liquid, noncoplanar, and 120$^{\circ}$,
+resulting from the spin-orbit coupling.",2110.00536v1
+2010-01-18,Effect of Spin-Orbit Interaction in Spin-Triplet Superconductor: Structure of ${\bf d}$-vector and Anomalous $^{17}$O-NQR Relaxation in Sr$_2$RuO$_4$,"Supposing the spin-triplet superconducting state of Sr$_2$RuO$_4$, the
+spin-orbit (SO) coupling associated with relative motion in Cooper pairs is
+calculated by extending the method for the dipole-dipole coupling given by
+Leggett in the superfluid $^{3}$He. It is shown that the SO coupling works only
+in the equal-spin pairing (ESP) state to make the pair angular momentum
+$\hbar{\vec L}$ and the pair spin angular momentum ${\rm i}{\vec d}\times{\vec
+d}^{*}$ parallel with each other. The SO coupling gives rise to the internal
+Josephson effect in a chiral ESP state as in superfluid A-phase of $^3$He with
+a help of an additional anisotropy arising from SO coupling of atomic origin
+which works to direct the {\bf d}-vector into $ab$-plane. This resolves the
+problem of the anomalous relaxation of $^{17}$O-NQR and the structure of {\bf
+d}-vector in Sr$_2$RuO$_4$.",1001.2999v1
+2011-08-13,First Principle Study of Magnetism and Magneto-structural Coupling in Gallium Ferrite,"We report a first-principles study of the magnetic properties, site disorder
+and magneto-structural coupling in multiferroic gallium ferrite (GFO) using
+local spin density approximation (LSDA+U) of density functional theory. The
+calculations of the ground state A-type antiferromagnetic structure predict
+magnetic moments consistent with the experiments whilst consideration of
+spin-orbit coupling yields a net orbital moment of ~ 0.025 Bohr magneton/Fe
+site also in good accordance with the experiments. We find that though site
+disorder is not spontaneous in the ground state, interchange between Fe2 and
+Ga2 sites is most favored in the disordered state. The results show that
+ferrimagnetism in GFO is due to Ga-Fe site disordering such that Fe spins at
+Ga1 and Ga2 sites are antiferromagnetically aligned while maintaining
+ferromagnetic coupling between Fe spins at Ga1 and Fe1 sites as well as between
+Fe spins at Ga2 and Fe2 sites. The effect of spin configuration on the
+structural distortion clearly indicates presence of magneto-structural coupling
+in GFO.",1108.2773v1
+2011-10-21,Spin-orbit-induced strong coupling of a single spin to a nanomechanical resonator,"We theoretically investigate the deflection-induced coupling of an electron
+spin to vibrational motion due to spin-orbit coupling in suspended carbon
+nanotube quantum dots. Our estimates indicate that, with current capabilities,
+a quantum dot with an odd number of electrons can serve as a realization of the
+Jaynes-Cummings model of quantum electrodynamics in the strong-coupling regime.
+A quantized flexural mode of the suspended tube plays the role of the optical
+mode and we identify two distinct two-level subspaces, at small and large
+magnetic field, which can be used as qubits in this setup. The strong intrinsic
+spin-mechanical coupling allows for detection, as well as manipulation of the
+spin qubit, and may yield enhanced performance of nanotubes in sensing
+applications.",1110.4893v2
+2014-05-09,Magnetization dynamics and damping due to electron-phonon scattering in a ferrimagnetic exchange model,"We present a microscopic calculation of magnetization damping for a magnetic
+""toy model."" The magnetic system consists of itinerant carriers coupled
+antiferromagnetically to a dispersionless band of localized spins, and the
+magnetization damping is due to coupling of the itinerant carriers to a phonon
+bath in the presence of spin-orbit coupling. Using a mean-field approximation
+for the kinetic exchange model and assuming the spin-orbit coupling to be of
+the Rashba form, we derive Boltzmann scattering integrals for the distributions
+and spin coherences in the case of an antiferromagnetic exchange splitting,
+including a careful analysis of the connection between lifetime broadening and
+the magnetic gap. For the Elliott-Yafet type itinerant spin dynamics we extract
+dephasing and magnetization times T_1 and T_2 from initial conditions
+corresponding to a tilt of the magnetization vector, and draw a comparison to
+phenomenological equations such as the Landau-Lifshitz or the Gilbert damping.
+We also analyze magnetization precession and damping for this system including
+an anisotropy field and find a carrier mediated dephasing of the localized spin
+via the mean-field coupling.",1405.2347v1
+2021-10-21,Radiation Modulated Spin coupling in DNA,"The spin activity in macromolecules such as DNA and oligopeptides, in the
+context of the Chiral Induced Spin Selectivity (CISS) has been proposed to be
+due to the atomic Spin-Orbit Coupling (SOC) and the associated chiral symmetry
+of the structures. This coupling, associated with carbon, nitrogen and oxygen
+atoms in biological molecules, albeit small (meV), can be enhanced by the
+geometry, and strong local polarization effects such as hydrogen bonding (HB).
+A novel way to manipulate the spin degree of freedom is by modifying the
+spectrum using a coupling to the appropriate electromagnetic radiation field.
+Here we use the Floquet formalism in order to show how the half filled band
+Hamiltonian for DNA, can be modulated by the radiation to produce a up to a
+tenfold increase of the effective SOC once the intrinsic coupling is present.
+On the other hand, the chiral model, once incorporating the orbital angular
+momentum of electron motion on the helix, opens a gap for different helicity
+states (helicity splitting) that chooses spin polarization according to
+transport direction and chirality, without breaking time reversal symmetry. The
+observed effects are feasible in physically reasonable parameter ranges for the
+radiation field amplitude and frequency.",2110.11250v1
+2023-07-27,Spin Coupling Effect on Geometry-Dependent X-ray Absorption of Diradicals,"We theoretically investigate the influence of diradical electron spin
+coupling on the time-resolved X-ray absorption spectra of the photochemical
+ring opening of furanone. We predict geometry dependent carbon K-edge signals
+involving transitions from core orbitals to both singly and unoccupied
+molecular orbitals. The most obvious features of the ring opening come from the
+carbon atom directly involved in the bond breaking, through its transition to
+both the newly formed SOMO and the available LUMO state. In addition to this
+primary feature, the singlet spin coupling of four unpaired electrons that
+arises in the core-to-LUMO states creates additional geometry dependence in
+some spectral features, with both oscillator strengths and relative excitation
+energies varying observably as a function of the ring opening. We attribute
+this behavior to a spin-occupancy-induced selection rule, which occurs when
+singlet spin coupling is enforced in the diradical state. Notably, one of these
+geometry-sensitive core-to-LUMO transitions excites core electrons from a
+backbone carbon not involved in the bond breaking, providing a novel non-local
+X-ray probe of chemical dynamics arising from electron spin coupling.",2307.15207v1
+2020-03-14,Enhanced longevity of the spin helix in low-symmetry quantum wells,"In a semiconductor, collective excitations of spin textures usually decay
+rather fast due to D'yakonov-Perel' spin relaxation. The latter arises from
+spin-orbit coupling, which induces wave-vector-dependent spin rotations that,
+in conjunction with random disorder scattering, generate spin decoherence.
+However, symmetries occurring under certain conditions can prevent the
+relaxation of particular homogeneous and inhomogeneous spin textures. The
+inhomogeneous spin texture, termed as persistent spin helix, is especially
+appealing as it enables us to manipulate the spin orientation while retaining a
+long spin lifetime. Recently, it was predicted that such symmetries can be
+realized in zinc-blende two-dimensional electron gases if at least two
+growth-direction Miller indices agree in modulus and the coefficients of the
+Rashba and linear Dresselhaus spin-orbit couplings are suitably matched [PRL
+117, 236801 (2016)]. In the present paper, we systematically analyze the impact
+of the symmetry-breaking cubic Dresselhaus spin-orbit coupling, which
+generically coexists in these systems, on the stability of the emerging spin
+helices with respect to the growth direction. We find that, as an interplay
+between orientation and strength of the effective magnetic field induced by the
+cubic Dresselhaus terms, the spin relaxation is weakest for a low-symmetry
+growth direction that can be well approximated by a [225] lattice vector. These
+quantum wells yield a 30\% spin-helix lifetime enhancement compared to
+[001]-oriented electron gases and, remarkably, require a negligible Rashba
+coefficient. The rotation axis of the corresponding spin helix is only slightly
+tilted out of the quantum-well plane. This makes the experimental study of the
+spin-helix dynamics readily accessible for conventional optical spin
+orientation measurements where spins are excited and detected along the
+quantum-well growth direction.",2003.06544v2
+2012-10-30,Fractional quantum Hall states of a Bose gas with spin-orbit coupling,"We study the fractional quantum Hall phases of a pseudospin-1/2 Bose gas in
+an artificial gauge field. In addition to an external magnetic field, the gauge
+field also mimics an intrinsic spin-orbit coupling of the Rashba type. While
+the spin degeneracy of the Landau levels is lifted by the spin-orbit coupling,
+the crossing of two Landau levels at certain coupling strengths gives rise to a
+new degeneracy. We therefore take into account two Landau levels, and perform
+exact diagonalization of the many-body Hamiltonian. We study and characterize
+the quantum Hall phases which occur in the vicinity of the degeneracy point.
+Notably, we describe the different states appearing at the Laughlin filling,
+\nu=1/2. While for this filling incompressible phases disappear at the
+degeneracy point, denser systems at \nu=3/2 and \nu=2 are found to be clearly
+gapped. For filling factors \nu=2/3 and \nu=4/3, we discuss the connection of
+the exact ground state to the non-Abelian spin singlet states, obtained as the
+ground state of k+1 body contact interactions.",1210.8035v2
+2014-11-10,Spin-orbit coupling and electronic charge effects in Mott insulators,"We derive the effective charge- and current-density operators for the
+strong-coupling limit of a single-band Mott insulator in the presence of
+spin-orbit coupling and show that the spin-orbit contribution to the effective
+charge density leads to novel mechanisms for multiferroic behavior. In some
+sense, these mechanisms are the electronic counterpart of the ionic-based
+mechanisms, which have been proposed for explaining the electric polarization
+induced by spiral spin orderings. The new electronic mechanisms are illustrated
+by considering cycloidal and proper screw magnetic orderings on sawtooth and
+kagome lattices. As for the isotropic case, geometric frustration is crucial
+for achieving this purely electronic coupling between spin and charge degrees
+of freedom.",1411.2511v1
+2014-12-08,Magnetization Dynamics driven by Non-equilibrium Spin-Orbit Coupled Electron Gas,"The dynamics of magnetization coupled to an electron gas via s-d exchange
+interaction is investigated by using density matrix technique. Our theory shows
+that non-equilibrium spin accumulation induces a spin torque and the electron
+bath leads to a damping of the magnetization. For the two-dimensional
+magnetization thin film coupled to the electron gas with Rashba spin-orbit
+coupling, the result for the spin-orbit torques is consistent with the previous
+semi-classical theory. Our theory predicts a damping of the magnetization,
+which is absent in the semi-classical theory. The magnitude of the damping due
+to the electron bath is comparable to the intrinsic Gilbert damping and may be
+important in describing the magnetization dynamics of the system.",1412.2479v1
+2016-04-05,Conductance measurement of spin-orbit coupling in the two-dimensional electron systems with in-plane magnetic field,"We consider determination of spin-orbit (SO) coupling constants for the
+two-dimensional electron gas from measurements of electric properties in
+rotated in-plane magnetic field. %Due to the interplay Due to the SO coupling
+the electron backscattering is accompanied by spin precession and spin mixing
+of the incident and reflected electron waves. The competition of the external
+and SO-related magnetic fields produces a characteristic conductance dependence
+on the in-plane magnetic field value and orientation which, in turn, allows for
+determination of the absolute value of the effective spin-orbit coupling
+constant as well as the ratio of the Rashba and Dresselhaus SO contributions.",1604.01270v2
+2016-09-25,Effects of Spin-Orbit Coupling on Jaynes-Cummings and Tavis-Cummings Models,"We consider ultracold atoms inside a ring optical cavity that supports a
+single plane-wave mode. The cavity field, together with an external coherent
+laser field, drives a two-photon Raman transition between two internal
+pseudo-spin states of the atom. This gives rise to an effective coupling
+between atom's pseudo-spin and external center-of-mass (COM) motion. For the
+case of a single atom inside the cavity, We show how the spin-orbit coupling
+modifies the static and dynamic properties of the Jaynes-Cummings (JC) model.
+In the case of many atoms in thermodynamic limit, we show that the spin-orbit
+coupling modifies the Dicke superradiance phase transition boundary and the
+non-superradiant normal phase may become reentrant in some regimes.",1609.07815v2
+2017-04-03,Spin-orbit-coupling induced localization in the expansion of an interacting Bose-Einstein condensate,"By developing a hydrodynamic formalism, we investigate the expansion dynamics
+of the single-minimum phase of a binary spin-orbit coupled Bose-Einstein
+condensate, after releasing from an external harmonic trap. We find that the
+expansion of the condensate along the direction of the spin-orbit coupling is
+dramatically slowed down near the transition between the single-minimum phase
+and the plane-wave phase. Such a slow expansion, resembling a form of an
+effective localization, is due to the quenching of the superfluid motion which
+results in a strong increase of the effective mass. In the single-minimum phase
+the anisotropic expansion of the Bose gas, which is spin balanced at
+equilibrium, is accompanied by the emergence of a local spin polarization. Our
+analytic scaling solutions emerging from hydrodynamic picture are compared with
+a full numerical simulation based on the coupled Gross-Pitaevskii equations.",1704.00677v1
+2020-12-28,Effect of proximity-induced spin-orbit coupling in graphene mesoscopic billiards,"Van der Waals heterostructures based on two-dimensional materials have
+recently become a very active topic of research in spintronics, both aiming at
+a fundamental description of spin dephasing processes in nanostructures and as
+a potential element in spin-based information processing schemes. Here, we
+theoretically investigate the magnetoconductance of mesoscopic devices built
+from graphene proximity-coupled to a high spin-orbit coupling material. Through
+numerically exact tight-binding simulations, we show that the interfacial
+breaking of inversion symmetry generates robust weak antilocalization even when
+the $z\rightarrow -z$ symmetric spin-orbit coupling in the quantum dot
+dominates over the Bychkov--Rashba interaction. Our findings are in interpreted
+on the light of random matrix theory, which links the observed behavior of
+quantum interference corrections to a transition from circular-orthogonal to
+circular-sympletic ensemble.",2012.14216v2
+2018-12-28,Impact of the Rashba Spin Orbit Coupling on $f$-electron Materials,"The combination of strong spin orbit coupling and strong correlations holds
+tremendous potential for interesting physical phenomena as well as applications
+in spintronics and quantum computation. In this context, we here study the
+interplay between the Rashba spin-orbit coupling (RSOC) and the Kondo screening
+in noncentrosymmetric $f$-electron materials. We show that the Kondo coupling
+of the $f$-electrons becomes anisotropic at high temperatures due to the RSOC.
+However, an isotropic Kondo effect is restored at low temperature which leads
+to a complete Kondo screening. We furthermore demonstrate that the Kondo effect
+has influence on the Rashba splitting in the band structure, which becomes
+temperature dependent. Although the $f$-electrons are localized at high
+temperature, a helical spin polarization of the conduction band emerges due to
+the scattering with the $f$-electrons. With decreasing temperature, the Kondo
+screening occurs, which leads to drastic changes in the band structure.
+Remarkably, these changes in the band structure depend on the helical spin
+polarization. For strong RSOC, we observe that the hybridization gap of one of
+the helical bands is closed at low temperature and a helical half-metal is
+formed.",1812.10888v1
+2019-03-22,Modified exchange interaction between magnetic impurities in spin-orbit coupled quantum wires,"Indirect exchange interaction between magnetic impurities in one dimensional
+systems is a matter of long discussions since Kittel has established that in
+the asymptotic limit it decays as the inverse of distance x between the
+impurities. In this work we investigate this problem in a quantum wire with
+Rashba spin-orbit coupling (SOC). By employing a second order perturbation
+theory we find that one additional oscillatory term appears in each of the
+RKKY, the Dzaloshinkii-Moryia and the Ising couplings. Remarkably, these extra
+terms resulting from the spin precession of the conduction electrons induced by
+the SOC do not decay as in the usual RKKY interaction. We show that these extra
+oscillations arise from the finite momenta band splitting induced by the
+spin-orbit coupling that modifies the spin-flip scatterings occurring at the
+Fermi energy. Our findings open up a new perspective in the long-distance
+magnetic interactions in solid state systems.",1903.09700v1
+2021-09-03,Excited-state quantum phase transitions in spin-orbit coupled Bose gases,"Excited-state quantum phase transitions depend on and reveal the structure of
+the whole spectrum of many-body systems. While they are theoretically well
+understood, finding suitable signatures and detect them in actual experiments
+remains challenging. For instance, in spinor gases, excited-state phases have
+been identified and characterized through a topological order parameter that is
+challenging to measure in experiments. Here, we propose the Raman-dressed
+spin-orbit coupled gas as a novel platform to explore excited-state quantum
+phase transitions. In a weakly-coupled regime, the dressed system is equivalent
+to a spinor gas with tunable spin-spin interactions. Through this equivalence
+we are able to define a new excited-state phase of the dressed gas. The phase
+is characterize by the the behavior of the spatial density modulations, or
+stripes, induced by spin-orbit coupling, and can in principle be measured in
+current state-of-the-art experiments with ultracold atoms. Conversely, we show
+that the properties of the excited phase can be exploited to prepare stripe
+states with large and stable density modulations.",2109.01495v1
+2013-12-25,Electron spin relaxation due to D'yakonov-Perel' and Elliot-Yafet mechanisms in monolayer MoS$_2$: Role of intravalley and intervalley processes,"We investigate the in-plane spin relaxation of electrons due to the
+D'yakonov-Perel' and Elliot-Yafet mechanisms including the intra- and
+inter-valley processes in monolayer MoS$_2$. We construct the effective
+Hamiltonian for the conduction band using the L\""{o}wdin partition method from
+the anisotropic two-band Hamiltonian with the intrinsic spin-orbit coupling of
+the conduction band included. The spin-orbit coupling of the conduction band
+induces the intra- and inter-valley D'yakonov-Perel' spin relaxation. In
+addition, the Elliot-Yafet spin relaxation also takes place due to the
+interband spin mixing. We find that the D'yakonov-Perel' mechanism dominates
+the in-plane spin relaxation. In the framework of this mechanism, the
+intravalley process is shown to play a more important role at low temperature
+whereas the intervalley one becomes more important at high temperature. At the
+temperature in between, the leading process of the in-plane spin relaxation
+changes from the intervalley to intravalley one as the electron density
+increases. Moreover, we find that the intravalley process is dominated by the
+electron-electron Coulomb scattering even with high impurity density since the
+dominant term in the spin-orbit coupling is isotropic, which does not lead to
+the spin relaxation together with the electron-impurity scattering. This is
+very different from the previous studies in semiconductors and graphene.",1312.6985v1
+2015-01-28,Spin-orbit coupled repulsive Fermi atoms in a one-dimensional optical lattice,"Motivated by recent experimental development, we investigate spin-orbit
+coupled repulsive Fermi atoms in a one-dimensional optical lattice. Using the
+density-matrix renormalization group method, we calculate momentum distribution
+function, gap, and spin-correlation function to reveal rich ground-state
+properties. We find that spin-orbit coupling (SOC) can generate unconventional
+momentum distribution, which depends crucially on the filling. We call the
+corresponding phase with zero gap the SOC-induced metallic phase. We also show
+that SOC can drive the system from the antiferromagnetic to ferromagnetic Mott
+insulators with spin rotating. As a result, a second-order quantum phase
+transition between the spin-rotating ferromagnetic Mott insulator and the
+SOC-induced metallic phase is predicted at the strong SOC. Here the spin
+rotating means that the spin orientations of the nearest-neighbor sites are not
+parallel or antiparallel, i.e., they have an intersection angle $\theta \in
+(0,\pi )$. Finally, we show that the momentum $k_{\mathrm{peak}}$, at which
+peak of the spin-structure factor appears, can also be affected dramatically by
+SOC. The analytical expression of this momentum with respect to the SOC
+strength is also derived. It suggests that the predicted spin-rotating
+ferromagnetic ($k_{\mathrm{peak}% }<\pi /2$) and antiferromagnetic ($\pi
+/2<k_{\mathrm{peak}}<\pi $) correlations can be detected experimentally by
+measuring the SOC-dependent spin-structure factor via the time-of-flight
+imaging.",1501.07004v2
+2021-10-13,Electric-field control of magnetic anisotropies: applications to Kitaev spin liquids and topological spin textures,"Magnetic anisotropies often originate from the spin-orbit coupling and
+determine magnetic ordering patterns. We develop a microscopic theory for DC
+electric-field controls of magnetic anisotropies in magnetic Mott insulators
+and discuss its applications to Kitaev materials and topological spin textures.
+Throughout this paper, we take a microscopic approach based on Hubbard-like
+lattice models, tight-binding models with on-site interactions. We derive a
+low-energy spin Hamiltonian from a fourth-order perturbation expansion of the
+Hubbard-like model. We show in the presence of a strong intra-atomic spin-orbit
+coupling that DC electric fields add non-Kitaev interactions such as a
+Dzyaloshinskii-Moriya interaction and an off-diagonal $\Gamma'$ interaction to
+the Kitaev-Heisenberg model and can induce a topological quantum phase
+transition between Majorana Chern insulating phases. We also investigate the
+inter-atomic Rashba spin-orbit coupling and its effects on topological spin
+textures. DC electric fields turn out to create and annihilate magnetic
+skyrmions, hedgehogs, and chiral solitons. We propose several methods of
+creating topological spin textures with external electromagnetic fields. Our
+theory clarifies that the strong but feasible electric field can control Kitaev
+spin liquids and topological spin textures.",2110.06503v4
+2014-08-06,Orbital magnetic moments in insulating Dirac systems: Impact on magnetotransport in graphene van der Waals heterostructures,"In honeycomb Dirac systems with broken inversion symmetry, orbital magnetic
+moments coupled to the valley degree of freedom arise due to the topology of
+the band structure, leading to valley-selective optical dichroism. On the other
+hand, in Dirac systems with prominent spin-orbit coupling, similar orbital
+magnetic moments emerge as well. These moments are coupled to spin, but
+otherwise have the same functional form as the moments stemming from spatial
+inversion breaking. After reviewing the basic properties of these moments,
+which are relevant for a whole set of newly discovered materials, such as
+silicene and germanene, we study the particular impact that these moments have
+on graphene nanoengineered barriers with artificially enhanced spin-orbit
+coupling. We examine transmission properties of such barriers in the presence
+of a magnetic field. The orbital moments are found to manifest in transport
+characteristics through spin-dependent transmission and conductance, making
+them directly accessible in experiments. Moreover, the Zeeman-type effects
+appear without explicitly incorporating the Zeeman term in the models, i.e., by
+using minimal coupling and Peierls substitution in continuum and the
+tight-binding methods, respectively. We find that a quasiclassical view is able
+to explain all the observed phenomena.",1408.1200v2
+2006-03-27,Spin and charge optical conductivities in spin-orbit coupled systems,"We study the frequency dependent spin- and charge- conductivity tensors of a
+two-dimensional electron gas (2DEG) with Rashba and Dresselhaus spin-orbit
+interaction. We show that the angular anisotropy of the spin-splitting energy
+induced by the interplay between the Rashba and Dresselhaus couplings gives
+rise to a characteristic spectral behavior of the spin and charge response
+which is significantly different from that of pure Rashba or Dresselhaus case.
+Such new spectral structures open the possibility for control of the optical
+response by applying an external bias and/or by adjusting the light frequency.
+In addition, it is shown that the relative strength of the spin-orbit coupling
+parameters can be obtained through optical probing.",0603722v3
+2006-03-28,Kinetic magnetoelectric effect in a 2D semiconductor strip due to boundary-confinement induced spin-orbit coupling,"In a thin strip of a two-dimensional semiconductor electronic system,
+spin-orbit coupling may be induced near both edges of the strip due to the
+substantial spatial variation of the confining potential in the boundary
+regions. In this paper we show that, in the presence of boundary-confinement
+induced spin-orbit coupling, a longitudinal charge current circulating through
+a 2D semiconductor strip may cause \textit{strong} non-equilibrium spin
+accumulation near both edges of the strip. The spins will be polarized along
+the normal of the 2DEG plane but in opposite directions at both edges of the
+strip. This phenomenon is essentially a kinetic magnetoelectric effect from the
+theoretical points of view, but it manifests in a very similar form as was
+conceived in a spin Hall effect.",0603755v1
+2010-01-14,Spin-orbit coupled Bose-Einstein condensate in a tilted optical lattice,"Bloch oscillations appear for a particle in a weakly tilted periodic
+potential. The intrinsic spin Hall effect is an outcome of a spin-orbit
+coupling. We demonstrate that both these phenomena can be realized
+simultaneously in a gas of weakly interacting ultracold atoms exposed to a
+tilted optical lattice and to a set of spatially dependent light fields
+inducing an effective spin-orbit coupling. It is found that both the spin Hall
+as well as the Bloch oscillation effects may coexist, showing, however, a
+strong correlation between the two. These correlations are manifested as a
+transverse spin current oscillating in-phase with the Bloch oscillations.",1001.2527v2
+2011-07-01,Spin Hall effect in iron-based superconductors: A Dirac-point effect,"We have theoretically explored the intrinsic spin Hall effect (SHE) in the
+iron-based superconductor family with a variety of materials. The study is
+motivated by an observation that, in addition to an appreciable spin-orbit
+coupling in the Fe 3d states, a character of the band structure in which Dirac
+cones appear below the Fermi energy may play a crucial role in producing a
+large SHE. Our investigation does indeed predict a substantially large spin
+Hall conductivity in the heavily hole-doped regime such as KFe$_2$As$_2$. The
+magnitude of the SHE has turned out to be comparable with that for Pt despite a
+relatively small spin-orbit coupling, which we identify to come from a huge
+contribution from the gap opening induced by the spin-orbit coupling at the
+Dirac point, which can become close to the Fermi energy for the heavy hole
+doping.",1107.0122v2
+2013-03-08,Rashba spin-orbit coupling effects in quasiparticle interference of non-centrosymmetric superconductors,"The theory of quasiparticle interference (QPI) for non-centrosymmetric (NCS)
+superconductors with Rashba spin-orbit coupling is developed using T-matrix
+theory in Born approximation. We show that qualitatively new effects in the QPI
+pattern originate from the Rashba spin-orbit coupling: The resulting spin
+coherence factors lead to a distinct difference of charge- and spin- QPI and to
+an induced spin anisotropy in the latter even for isotropic magnetic impurity
+scattering. In particular a cross - QPI appears describing the spin oscillation
+pattern due to nonmagnetic impurity scattering which is directly related to the
+Rashba vector. We apply our theory to a 2D model for the NCS heavy fermion
+unconventional superconductor CePt$_3$Si and discuss the new QPI features for a
+gap model with accidental node lines due to its composite singlet-triplet
+nature.",1303.1974v2
+2014-02-15,Spin-orbit coupling and the up-down differential transverse flow in intermediate-energy heavy-ion collisions,"To explore the strength, isospin dependence, and density dependence of the
+in-medium spin-orbit coupling that is poorly known but relevant for
+understanding the structure of rare isotopes, the nucleon spin up-down
+differential transverse flow is studied systematically by varying the beam
+energy and impact parameter of Au+Au collisions within a spin-isospin dependent
+transport model recently developed for investigating spin-related phenomena in
+intermediate-energy heavy-ion collisions. The optimal reaction conditions for
+delineating and disentangling effects of different terms in the spin-orbit
+coupling are discussed.",1402.3670v2
+2014-09-09,Most spin-1/2 transition-metal ions do have single ion anisotropy,"The cause for the preferred spin orientation in magnetic systems containing
+spin-1/2 transition-metal ions was explored by studying the origin of the
+easy-plane anisotropy of the spin-1/2 Cu2+ ions in CuCl2.2H2O, LiCuVO4, CuCl2
+and CuBr2 on the basis of density functional theory and magnetic dipole-dipole
+energy calculations as well as a perturbation theory treatment of the
+spin-orbit coupling. We find that the spin orientation observed for these
+spin-1/2 ions is not caused by their anisotropic spin exchange interactions,
+nor by their magnetic dipole-dipole interactions, but by the spin-orbit
+coupling associated with their crystal-field split d-states. Our study also
+predicts in-plane anisotropy for the Cu2+ ions of Bi2CuO4 and Li2CuO2. The
+results of our investigations dispel the mistaken belief that magnetic systems
+with spin-1/2 ions have no magnetic anisotropy induced by spin-orbit coupling.",1409.2795v2
+2014-09-23,Bound state and persistent currents in the presence of torsion and Rashba spin-orbit coupling,"We study a model of an electron on a cylindrical surface, which is coupled to
+the torsion field due to a dislocation along the axis of the cylinder. We
+discuss the effect of this torsion field on the energy spectrum of the
+electrons and analytically calculate persistent currents in the presence of
+Rashba spin-orbit coupling. We also analyze bound state energy spectra in
+presence of Rashba spin-orbit interaction. Our results show that the presence
+of the torsional field due to the dislocation significantly modifies the energy
+spectrum of the system. The dislocation induced persistent spin current in this
+system is calculated, and we find a correspondence between the dislocation
+mediated spin current and the azimuthal spin current.",1409.6756v1
+2015-02-11,One-Dimensional Edge States with Giant Spin Splitting in a Bismuth Thin Film,"To realize a one-dimensional (1D) system with strong spin-orbit coupling is a
+big challenge in modern physics, since the electrons in such a system are
+predicted to exhibit exotic properties unexpected from the 2D or 3D
+counterparts, while it was difficult to realize genuine physical properties
+inherent to the 1D system. We demonstrate the first experimental result that
+directly determines the purely 1D band structure by performing spin-resolved
+angle-resolved photoemission spectroscopy of Bi islands on a silicon surface
+that contains a metallic 1D edge structure with unexpectedly large Rashba-type
+spin-orbit coupling suggestive of the nontopological nature. We have also found
+a sizable out-of-plane spin polarization of the 1D edge state, consistent with
+our first-principles band calculations. Our result provides a new platform to
+realize exotic quantum phenomena at the 1D edge of the strong
+spin-orbit-coupling systems.",1502.03197v1
+2015-02-16,Gap Solitons in Spin-Orbit-Coupled Bose-Einstein Condensates in Optical Lattices,"While different ways to realize spin-orbit coupling in Bose-Einstein
+condensates exist, not all are currently experimentally implementable. Here we
+present a detailed study of gap solitons in a Bose- Einstein condensate with
+experimentally realizable spin-orbit coupling and discuss two cases relating to
+a spin-dependent parity symmetry. In the parity symmetric case, two families of
+fundamental gap solitons in second linear energy gap are demonstrated with
+opposite sign of the parity, with one family having single humped densities and
+the other double humped ones. In the case of broken parity symmetry, the
+fundamental modes manifest spin-polarization. Both families possess an opposite
+sign of the spin-polarization.",1502.04409v2
+2015-03-19,Coulomb-exchange effects in nanowires with spin splitting due to a radial electric field,"We present a theoretical study of Coulomb exchange interaction for electrons
+confined in a cylindrical quantum wire and subject to a Rashba-type spin-orbit
+coupling with radial electric field. The effect of spin splitting on the
+single-particle band dispersions, the quasiparticle effective mass, and the
+system's total exchange energy per particle are discussed. Exchange interaction
+generally suppresses the quasiparticle effective mass in the lowest nanowire
+subband, and a finite spin splitting is found to significantly increase the
+magnitude of the quasiparticle-mass suppression (by upto 15\% in the
+experimentally relevant parameter regime). In contrast, spin-orbit coupling
+causes a modest (1\%-level) reduction of the magnitude of the exchange energy
+per particle. Our results shed new light on the interplay of spin-orbit
+coupling and Coulomb interaction in quantum-confined systems, including those
+that are expected to host exotic quasiparticle excitations.",1503.05627v2
+2017-02-01,Strain Controlled Spin and Charge Pumping in Graphene Devices via Spin-orbit Coupled Barriers,"We theoretically propose a graphene-based adiabatic quantum pump with
+intrinsic spin-orbit coupling (SOC) subject to strain where two time-dependent
+extrinsic spin-orbit coupled barriers drive spin and charge currents. We study
+three differing operation modes where i) location, ii) chemical potential, and
+iii) SOC of the two barriers oscillate periodically and out of phase around
+their equilibrium states. Our results demonstrate that the amplitude of
+adiabatically pumped currents highly depends on the considered operation mode.
+We find that such a device operates with highest efficiency and in a broader
+range of parameters where the barriers chemical potential drives the quantum
+pump. Our results also reveal that by introducing strain to the system, one can
+suppress or enhance the charge and spin currents separately, depending on
+strain direction.",1702.00246v1
+2018-02-09,Spin-susceptibility of spin-orbit coupled Fermi superfluids,"Under the self-consistent mean-field approach for the BCS-BEC crossover
+problem, we derive a closed-form analytical expression for the general spin
+response of noncentrosymmetric Fermi superfluids with arbitrary spin-orbit
+coupling and Zeeman fields. In addition to the paramagnetic, i.e., the Pauli
+intra-helicity and Van Vleck type inter-helicity, contributions to the
+spin-susceptibility tensor that have normal-state counterparts, we identify a
+diamagnetic inter-helicity contribution that is unique to the superfluid state.
+Our extensive numerical calculations for the Weyl, Rashba and equal
+Rashba-Dresselhaus spin-orbit couplings illustrate that it is this diamagnetic
+contribution that grows gradually with pairing and cancels precisely the Van
+Vleck contribution away from the BCS regime in general.",1802.03157v2
+2018-05-21,Dynamical suppression of tunneling and spin switching of a spin-orbit-coupled atom in a double-well trap,"We predict wide-band suppression of tunneling of spin-orbit-coupled atoms (or
+noninteracting Bose-Einstein condensate) in a double-well potential with
+periodically varying depths of the potential wells. The suppression of
+tunneling is possible for a single state and for superposition of two states,
+i.e. for a qbit. By varying spin-orbit coupling one can drastically increase
+the range of modulation frequencies in which an atom remains localized in one
+of the potential wells, the effect connected with crossing of energy levels.
+This range of frequencies is limited because temporal modulation may also
+excite resonant transitions between lower and upper states in different wells.
+The resonant transitions enhance tunneling and are accompanied by pseudo-spin
+switching. Since the frequencies of the resonant transitions are independent of
+potential modulation depth, in contrast to frequencies at which suppression of
+tunneling occurs, by varying this depth one can dynamically control both
+spatial localization and pseudo-spin of the final state.",1805.07961v1
+2011-11-21,Tunable Spin-orbit Coupling and Quantum Phase Transition in a Trapped Bose-Einstein Condensate,"Spin-orbit coupling (SOC), the intrinsic interaction between a particle spin
+and its motion, is responsible for various important phenomena, ranging from
+atomic fine structure to topological condensed matter physics. The recent
+experimental breakthrough on the realization of SOC for ultra-cold atoms
+provides a completely new platform for exploring spin-orbit coupled superfluid
+physics. However, the SOC strength in the experiment, determined by the applied
+laser wavelengths, is not tunable. In this Letter, we propose a scheme for
+tuning the SOC strength through a fast and coherent modulation of the laser
+intensities. We show that the many-body interaction between atoms, together
+with the tunable SOC, can drive a \textit{quantum phase transition} (QPT) from
+spin-balanced to spin-polarized ground states in a harmonic trapped
+Bose-Einstein condensate (BEC). This transition realizes the long-sought QPT in
+the quantum Dicke model, and may have important applications in quantum optics
+and quantum information. We characterize the QPT using the periods of
+collective oscillations (center of mass motion and scissors mode) of the BEC,
+which show pronounced peaks and damping around the quantum critical point.",1111.4778v1
+2019-07-04,Nonperturbative Matrix Mechanics Approach to Spin-Split Landau Levels and g-Factor in Spin-Orbit Coupled Solids,"We have proposed a fully quantum approach to non-perturbatively calculate the
+spin-split Landau levels and g-factor of various spin-orbit coupled solids,
+based on the k.p theory in the matrix mechanics representation. The new method
+considers the detailed band structure and the multiband effect of spin-orbit
+coupling irrespective of the magnetic field strength. An application of this
+method to PbTe, a typical Dirac electron system, is shown. Contrary to popular
+belief, it is shown that the spin-splitting parameter M, which is the ratio of
+the Zeeman to cyclotron energy, exhibits a remarkable
+magnetic-field-dependence. This field-dependence can rectify the existing
+discrepancy between experimental and theoretical results. We have also shown
+that M evaluated from the fan diagram plot is different from that determined as
+the ratio of the Zeeman to cyclotron energy, which also overturns common
+belief.",1907.02254v1
+2019-08-19,Planar Hall Effect and Anisotropic Magnetoresistance in a polar-polar interface of LaVO$_3$-KTaO$_3$ with strong spin-orbit coupling,"Among the perovskite oxide family, KTaO$_3$ (KTO) has recently attracted
+considerable interest as a possible system for the realization of the Rashba
+effect. In this work, we improvise a novel conducting interface by juxtaposing
+KTO with another insulator, namely LaVO$_3$ (LVO) and report planar Hall effect
+(PHE) and anisotropic magnetoresistance (AMR) measurements. This interface
+exhibits a signature of strong spin-orbit coupling. Our experimental
+observation of two fold AMR at low magnetic fields can be intuitively
+understood using a phenomenological theory for a Rashba spin-split system. At
+high fields ($\sim$8 T), we see a two fold to four fold transition in the AMR
+that could not be explained using only Rashba spin-split energy spectra. We
+speculate that it might be generated through an intricate process arising from
+the interplay between strong spin-orbit coupling, broken inversion symmetery,
+relativistic conduction electron and possible uncompensated localized vanadium
+spins.",1908.06636v1
+2020-05-21,Magnetism and topological phases in an interacting decorated honeycomb lattice with spin-orbit coupling,"We study the interplay between spin-orbit coupling (SOC) and Coulomb
+repulsion in a Hubbard model on a decorated honeycomb lattice which leads to a
+plethora of phases. While a quantum spin hall insulator is stable at weak
+Coulomb repulsion and moderate SOC, a semimetallic phase emerges at large SOC
+in a broad range of Coulomb repulsion. This semimetallic phase has topological
+properties not observed in conventional metals such as a finite, non-quantized
+spin Hall conductivity. At large Coulomb repulsion and negligible spin-orbit
+coupling, electronic correlations stabilize a resonance valence bond (RVB) spin
+liquid state in contrast to the classical antiferromagnetic state predicted by
+mean-field theory. Under sufficiently strong SOC, such RVB state is transformed
+into a magnetic insulator consisting on S~3/2 localized moments on a honeycomb
+lattice with antiferromagnetic order and topological features.",2005.10776v2
+2020-11-13,Manipulation of Spin Transport in Graphene/Transition Metal Dichalcogenide Heterobilayers upon Twisting,"Proximity effects are one of the pillars of exotic phenomena and
+technological applications of two dimensional materials. However, the
+interactions nature depends strongly on the materials involved, their
+crystalline symmetries, and interfacial properties. Here we used large-scale
+first-principle calculations to demonstrate that strain and twist-angle are
+efficient knobs to tailor the spin-orbit coupling in graphene transition metal
+dichalcogenide heterobilayers. We found that by choosing a twist-angle of 30
+degrees, the spin relaxation times increase by two orders of magnitude, opening
+a path to improve these heterostructures spin transport capability. Moreover,
+we demonstrate that strain and twist angle will modify the relative values of
+valley-Zeeman and Rashba spin-orbit coupling, allowing to tune the system into
+an ideal Dirac-Rashba regime. These results enable us to envision an answer for
+the variability of spin-orbit coupling found in different experiments and have
+significant consequences for applications that depend on polycrystallinity,
+where grains form at different orientations.",2011.06714v2
+2021-04-19,Spin transfer torque and anisotropic conductance in spin orbit coupled graphene,"We theoretically study spin-transfer torque (STT) in a graphene system with
+spin-orbit coupling (SOC). We consider a graphene-based junction where the
+spin-orbit coupled region is sandwiched between two ferromagnetic (F) segments.
+The magnetization in each ferromagnetic segment can possess arbitrary
+orientations. Our results show that the presence of SOC results in
+anisotropically modified STT, magnetoresistance, and charge conductance as a
+function of relative magnetization misalignment in the F regions. We have found
+that within the Klein regime, where particles hit the interfaces
+perpendicularly, the spin-polarized Dirac fermions transmit perfectly through
+the boundaries of an F-F junction (i.e., with zero reflection), regardless of
+the relative magnetization misalignment and exert zero STT. In the presence of
+SOC, however, due to band structure modification, a nonzero STT reappears. Our
+findings can be exploited for experimentally examining proximity-induced SOC
+into a graphene system",2104.09039v1
+2021-10-04,Spin-Phonon Resonances in Nearly Polar Metals with Spin-Orbit Coupling,"In metals in the vicinity of a polar transition, interactions between
+electrons and soft phonon modes remain to be determined. Here we explore the
+consequences of spin-orbit assisted electron-phonon coupling on the collective
+modes of such nearly polar metals in the presense of magnetic field. We find
+that the soft polar phonon hybridizes with spin-flip electronic excitations of
+the Zeeman-split bands leading to an anticrossing. The associated energy
+splitting allows for an unambiguous determination of the strength of the
+spin-orbit mediated coupling to soft modes in polar metals by spectroscopic
+experiments. The approach to the polar transition is reflected by the softening
+of the effective g-factor of the hybridized spin-flip mode. Analyzing the
+static limit, we find that the polar order parameter can be oriented by
+magnetic field. This provides possibilities for new switching protocols in
+polar metallic materials. We demonstrate that the effects we predict can be
+observed with current experimental techniques and discuss promising material
+candidates.",2110.01642v2
+2021-11-04,Quantum interference tuning of spin-orbit coupling in twisted van der Waals trilayers,"We show that in van der Waals stacks of twisted hexagonal layers the
+proximity induced Rashba spin-orbit coupling can be affected by quantum
+interference. We calculate the quantum phase responsible for this effect in
+graphene--transition metal dichalcogenide bilayers as a function of interlayer
+twist angle. We show how this quantum phase affects the spin-polarization of
+the graphene bands and discuss its potential effect on spin-to-charge
+conversion measurements. In twisted trilayers symmetries can be broken as well
+as restored for certain twist angles. This can be used to deduce the effects of
+induced spin-orbit coupling on spin-lifetime anisotropy and magnetoconductance
+measurements.",2111.02781v2
+2023-01-08,"Chiral anomalies in 3D spin-orbit coupled metals: electrical, thermal, and gravitational anomaly","The discovery of a chiral anomaly in Weyl semimetals, the non-conservation of
+chiral charge and energy across two opposite chirality Weyl nodes, has sparked
+immense interest in understanding its impact on various physical phenomena.
+Here, we demonstrate the existence of electrical, thermal, and gravitational
+quantum chiral anomalies in 3D spin-orbit coupled systems. Notably, these
+anomalies involve chiral charge transfer across two Fermi surfaces linked to a
+single Weyl-like point, rather than across opposite chirality Weyl nodes as in
+Weyl semimetals. Our findings reveal that the Berry curvature flux piercing the
+Fermi surface plays a critical role in distinguishing the `chirality' of the
+carriers and the corresponding chiral charge and energy transfer. Importantly,
+we demonstrate that these quantum chiral anomalies lead to interesting thermal
+spin transport such as the spin Nernst effect. Our results suggest that 3D
+spin-orbit coupled metals offer a promising platform for investigating the
+interplay between quantum chiral anomalies and charge and spin transport in
+non-relativistic systems.",2301.02965v1
+2006-03-10,Theory of Spin Hall Effects in Semiconductors,"Spin Hall effects are a collection of phenomena, resulting from spin-orbit
+coupling, in which an electrical current flowing through a sample can lead to
+spin transport in a perpendicular direction and spin accumulation at lateral
+boundaries. These effects, which do not require an applied magnetic field, can
+originate in a variety of intrinsic and extrinsic spin-orbit coupling
+mechanisms and depend on geometry, dimension, impurity scattering, and carrier
+density of the system--making the analysis of these effects a diverse field of
+research. In this article, we give an overview of the theoretical background of
+the spin Hall effects and summarize some of the most important results. First,
+we explain effective spin-orbit Hamiltonians, how they arise from band
+structure, and how they can be understood from symmetry considerations;
+including intrinsic coupling due to bulk inversion or structure asymmetry or
+due to strain, and extrinsic coupling due to impurities. This leads to
+different mechanisms of spin transport: spin precession, skew scattering, and
+side jump. Then we present the kinetic (Boltzmann) equations, which describe
+the spin-dependent distribution function of charge carriers, and the diffusion
+equation for spin polarization density. Next, we define the notion of spin
+currents and discuss their relation to spin polarization. Finally, we explain
+the electrically induced spin effects; namely, spin polarization and currents
+in bulk and near boundaries (the focus of most current theoretical research
+efforts), and spin injection, as well as effects in mesoscopic systems and in
+edge states.",0603306v3
+2004-02-11,Spin-precession in an adiabatically rotating electric field,"Due to spin-orbit coupling, the adiabatic perturbation of an electron's
+orbital motion induced by a revolving external electric field lead to the
+electron spin-precession. The obtained results describe both transverse and
+longitudinal dynamics of an effective spin, for conical and figure-8
+trajectories of a driving electric field, and elucidate the link between the
+quantum-mechanical, geometrical, and classical pictures of spin rotation.
+Within the limit of adiabatic approximation the derived formulas are valid
+regardless of whether eigenvectors of the total Hamiltonian of the problem are
+explicitly available or not, and are convenient for approximate calculations.
+The main expression for the time evolution of the Bloch vector has pure
+geometric character and is independent of the physical context.",0402319v1
+2005-03-13,Anti-crossings of spin-split Landau levels in an InAs two-dimensional electron gas with spin-orbit coupling,"We report tilted-field transport measurements in the quantum-Hall regime in
+an InAs/In_0.75Ga_0.25As/In_0.75Al_0.25As quantum well. We observe
+anti-crossings of spin-split Landau levels, which suggest a mixing of spin
+states at Landau level coincidence. We propose that the level repulsion is due
+to the presence of spin-orbit and of band-non-parabolicity terms which are
+relevant in narrow-gap systems. Furthermore, electron-electron interaction is
+significant in our structure, as demonstrated by the large values of the
+interaction-induced enhancement of the electronic g-factor.",0503314v1
+2006-10-16,Mixing of two-electron spin states in a semiconductor quantum dot,"We show that the low lying spin states of two electrons in a semiconductor
+quantum dot can be strongly mixed by electron-electron asymmetric exchange.
+This mixing is generated by the coupling of electron spin to its orbital motion
+and to the relative orbital motion of the two electrons. The asymmetric
+exchange can be as large as 50% of the isotropic exchange, even for cylindrical
+quantum dots. The resulting spin mixing contributes to understanding spin
+dynamics in quantum dots, including light polarization reversal.",0610405v1
+2002-07-02,Gravitational Waves from Spinning Compact Binaries,"Binary systems of rapidly spinning compact objects, such as black holes or
+neutron stars, are prime targets for gravitational wave astronomers. The
+dynamics of these systems can be very complicated due to spin-orbit and
+spin-spin couplings. Contradictory results have been presented as to the nature
+of the dynamics. Here we confirm that the dynamics - as described by the second
+post-Newtonian approximation to general relativity - is chaotic, despite claims
+to the contrary. When dissipation due to higher order radiation reaction terms
+are included, the chaos is dampened. However, the inspiral-to-plunge transition
+that occurs toward the end of the orbital evolution does retain an imprint of
+the chaotic behaviour.",0207016v1
+2005-09-07,A Note on Frame Dragging,"The measurement of spin effects in general relativity has recently taken
+centre stage with the successfully launched Gravity Probe B experiment coming
+toward an end, coupled with recently reported measurements using laser ranging.
+Many accounts of these experiments have been in terms of frame-dragging. We
+point out that this terminology has given rise to much confusion and that a
+better description is in terms of spin-orbit and spin-spin effects. In
+particular, we point out that the de Sitter precession (which has been mesured
+to a high accuracy) is also a frame-dragging effect and provides an accurate
+benchmark measurement of spin-orbit effects which GPB needs to emulate.",0509025v1
+2008-10-30,Spin-Orbit gauge and quantum spin Hall effect,"We have shown that the non-Abelian spin-orbit gauge field strength of the
+Rashba and Dresselhaus interactions, when split into two Abelian field
+strengths, the Hamiltonian of the system can be re-expressed as a Landau level
+problem with a particular relation between the two coupling parameters. The
+quantum levels are created with up and down spins with opposite chirality and
+leads to the quantum spin Hall effect.",0810.5436v1
+2016-10-26,Classical spin liquid instability driven by off-diagonal exchange in strong spin-orbit magnets,"We show that the off-diagonal exchange anisotropy drives Mott insulators with
+strong spin-orbit coupling to a classical spin liquid regime, characterized by
+an infinite number of ground states and Ising variables living on closed or
+open strings. Depending on the sign of the anisotropy, quantum fluctuations
+either fail to lift the degeneracy down to very low temperatures, or select
+non-collinear magnetic states with unconventional spin correlations. The
+results apply to all 2D and 3D tri-coordinated materials with bond-directional
+anisotropy, and provide a consistent interpretation of the suppression of the
+x-ray magnetic circular dichroism signal reported recently for
+$\beta$-Li$_2$IrO$_3$ under pressure.",1610.08463v1
+2014-03-02,Spin disorder in an Ising honeycomb chain cobaltate,"We report on a member of the spin-disordered honeycomb lattice
+antiferromagnet in a quasi-one-dimensional cobaltate Ba_3Co_2O_6(CO_3)_0.7.
+Resistivity exhibits as semimetallic along the face-sharing CoO6 chains.
+Magnetic susceptibility shows strongly anisotropic Ising-spin character with
+the easy axis along the chain due to significant spin-orbit coupling and a
+trigonal crystal field. Nevertheless, ^135Ba NMR detects no indication of the
+long-range magnetic order down to 0.48 K. Marginally itinerant electrons
+possess large entropy and low-lying excitations with a Wilson ratio R_W = 116,
+which highlight interplays of charge, spin, and orbital in the disordered
+ground state.",1403.0208v1
+2005-03-20,On A Proper Definition of Spin Current,"The conventional definition of spin current is incomplete and unphysical in
+describing spin transport in systems with spin-orbit coupling. A proper and
+measurable spin current is established in this study, which fits well into the
+standard framework of near-equilibrium transport theory and has the desirable
+property to vanish in insulators with localized orbitals. Experimental
+implications of our theory are discussed.",0503505v5
+2005-12-30,Orbital Kondo effect and spin polarized transport through quantum dots,"The coherent spin dependent transport through a set of two capacitively
+coupled quantum dots placed in a magnetic field is considered within the
+equation of motion method. The magnetic field breaks the spin degeneracy. For
+special choices of gate voltages the dot levels are tuned to resonance and the
+orbital Kondo effect results. For different Zeemann splittings at the dots the
+Kondo resonance can be formed for only one spin channel. In this case the
+system operates as an efficient spin filter.",0512726v1
+2006-07-05,Measurements of the spin relaxation rate at low magnetic fields in a quantum dot,"We measure the relaxation rate $W \equiv T_{1}^{-1}$ of a single electron
+spin in a quantum dot at magnetic fields from 7 T down to 1.75 T, much lower
+than previously measured. At 1.75 T we find that $T_{1}$ is 170 ms. We find
+good agreement between our measurements and theoretical predictions of the
+relaxation rate caused by the spin-orbit interaction, demonstrating that
+spin-orbit coupling can account for spin relaxation in quantum dots.",0607110v1
+2015-06-03,Curvature effect on spin polarization in a three-terminal geometry in presence of Rashba spin-orbit interaction,"The robust effect of curvature on spin polarization is reported in a
+three-terminal bridge system where the bridging material is subjected to Rashba
+spin-orbit interaction. The results are examined considering two different
+geometric configurations, ring- and linear-like, of the material which is
+coupled to one input and two output leads. Our results exhibit absolute zero
+spin polarization for the linear sample, while finite polarization is obtained
+in output leads for the ring-like sample.",1506.01252v1
+2017-08-22,Defect-induced large spin-orbit splitting in the monolayer of PtSe$_2$,"The effect of spin-orbit coupling (SOC) on the electronic properties of
+monolayer (ML) PtSe$_2$ is dictated by the presence of the crystal inversion
+symmetry to exhibit spin polarized band without characteristic of spin
+splitting. Through fully-relativistic density-functional theory calculations,
+we show that large spin-orbit splitting can be induced by introducing point
+defects. We calculate stability of native point defects such as a Se vacancy
+(V$_{\texttt{Se}}$), a Se interstitial (Se$_{i}$), a Pt vacancy
+(V$_{\texttt{Pt}}$), and a Pt interstitial (Pt$_{i}$), and find that both the
+V$_{\texttt{Se}}$ and Se$_{i}$ have the lowest formation energy. We also find
+that in contrast to the Se$_{i}$ case exhibiting spin degeneracy in the defect
+states, the large spin-orbit splitting up to 152 meV is observed in the defect
+states of the V$_{\texttt{Se}}$. Our analyses of orbital contributions to the
+defect states show that the large spin splitting is originated from the strong
+hybridization between Pt-$d_{x{^2}+y{^2}}+d_{xy}$ and Se-$p_{x}+p_{y}$
+orbitals. Our study clarifies that the defects play an important role in the
+spin splitting properties of the PtSe$_2$ ML, which is important for designing
+future spintronic devices.",1708.06487v1
+2015-09-03,Configuration-averaged 4f orbitals in ab initio calculations of low-lying crystal field levels in lanthanide(III) complexes,"A successful and commonly used ab initio method for the calculation of
+crystal field levels and magnetic anisotropy of lanthanide complexes consists
+of spin-adapted state-averaged CASSCF calculations followed by state
+interaction with spin-orbit coupling (SI-SO). Based on two observations valid
+for Ln(III) complexes, namely: (i) CASSCF 4f orbitals are expected to change
+very little when optimized for different states belonging to the 4f electronic
+configuration, (ii) due to strong spin-orbit coupling the total spin is not a
+good quantum number, we show here via a straightforward analysis and direct
+calculation that the CASSCF/SI-SO method can be simplified to a single
+configuration-averaged HF calculation and one complete active space CI
+diagonalization, including spin-orbit coupling, on determinant basis. Besides
+its conceptual simplicity, this approach has the advantage that all spin states
+of the 4f$^n$ configuration are automatically included in the SO coupling,
+thereby overcoming one of the computational limitations of the existing
+CASSCF/SI-SO approach. As an example, we consider three isostructural complexes
+[Ln(acac)$_3$(H$_2$O)$_2$], Ln = Dy$^{3+}$, Ho$^{3+}$, Er$^{3+}$, and find that
+the proposed simplified method yields crystal field levels and magnetic
+g-tensors that are in very good agreement with those obtained with
+CASSCF/SI-SO.",1509.00974v2
+2004-10-11,Electron Correlations in a Quantum Dot with Bychkov-Rashba Coupling,"We report on a theoretical approach developed to investigate the influence of
+Bychkov-Rashba interaction on a few interacting electrons confined in a quantum
+dot. We note that the spin-orbit coupling profoundly influences the energy
+spectrum of interacting electrons in a quantum dot. Inter-electron interaction
+causes level crossings in the ground state and a jump in magnetization. As the
+coupling strength is increased, that jump is shifted to lower magnetic fields.
+Low-field magnetization will therefore provide a direct probe of the spin-orbit
+coupling strength in a quantum dot.",0410248v1
+2012-06-27,Graphene p-n junctions with nonuniform Rashba spin-orbit coupling,"Linear conductance of graphene-based p-n junctions with Rashba spin-orbit
+coupling is considered theoretically. A square potential step is used to model
+the junctions, while the coupling is introduced in terms of the Kane-Mele model
+(C.L. Kane and E.J. Mele, Phys.Rev.Lett. 95, 226801(2005)). The main objective
+is a description of electronic transport in junctions where Rashba parameter is
+nonuniform. Such a nonuniformity can appear when graphene is asymmetrically
+covered with atomic layers, or when Rashba coupling is strongly dependent on
+electric field. It is shown that conductance is significantly modified by the
+considered nonuniformity, which is most clearly manifested by an anomalous
+minimum at a certain potential step height.",1206.6503v1
+2017-03-23,Boson-vortex duality in compressible spin-orbit coupled BECs,"Using a (1+2)-dimensional boson-vortex duality between non-linear
+electrodynamics and a two-component compressible Bose-Einstein condensate (BEC)
+with spin-orbit (SO) coupling, we obtain generalised versions of the
+hydrodynamic continuity and Euler equations where the phase defect and
+non-defect degrees of freedom enter separately. We obtain the generalised
+Magnus force on vortices under SO coupling, and associate the linear
+confinement of vortices due to SO coupling with instanton fluctuations of the
+dual theory.",1703.07918v1
+2011-11-22,z/-z Symmetry of spin-orbit coupling and weak localization in graphene,"We show that the influence of spin-orbit (SO) coupling on the weak
+localization effect for electrons in graphene depends on the lack or presence
+of z/-z symmetry in the system. While for z/-z asymmetric SO coupling,
+disordered graphene should display a weak anti-localization behavior at lowest
+temperature, z/-z symmetric coupling leads to an effective saturation of
+decoherence time which can be partially lifted by an in-plane magnetic field,
+thus, tending to restore the weak localization effect.",1111.5267v1
+2017-10-10,Flipping-shuttle oscillations of bright one- and two-dimensional solitons in spin-orbit-coupled Bose-Einstein condensates with Rabi mixing,"We analyze a possibility of macroscopic quantum effects in the form of
+coupled structural oscillations and shuttle motion of bright two-component
+spin-orbit-coupled striped (one-dimensional, 1D) and semi-vortex
+(two-dimensional, 2D) matter-wave solitons, under the action of linear mixing
+(Rabi coupling) between the components. In 1D, the intrinsic oscillations
+manifest themselves as flippings between spatially even and odd components of
+striped solitons, while in 2D the system features periodic transitions between
+zero-vorticity and vortical components of semi-vortex solitons. The
+consideration is performed by means of a combination of analytical and
+numerical methods.",1710.03664v1
+2021-11-16,Pairing of electro-magnetic bosons under spin-orbit coupling,"We discuss pairing of light-matter bosons under effective spin-orbit (SO)
+coupling in two-dimensional semiconductors. The SO coupling is shown to induce
+dynamical broadening of a two-body bound state. Application of a transverse
+magnetic field yields the rich Feshbach resonance phenomenology. We predict
+quantum bosonic halos with a synthetic angular momentum L=2. The d-wave-like
+dressing of the nominally s-wave bound state is induced by SO coupling to the
+continuum in the open channel. The fundamental properties of the emergent
+quantum number remain to be explored.",2111.08782v1
+2021-11-29,Competing Correlated Insulators in multi-orbital systems coupled to phonons,"We study the interplay between electron-electron interaction and a
+Jahn-Teller phonon coupling in a two-orbital Hubbard model. We demonstrate that
+the e-ph interaction coexists with the Mott localization driven by the Hubbard
+repulsion U, but it competes with the Hund's coupling J. This interplay leads
+to two spectacularly different Mott insulators, a standard high-spin Mott
+insulator with frozen phonons which is stable when the Hund's coupling
+prevails, and a low-spin Mott-bipolaronic insulator favoured by phonons, where
+the characteristic features of Mott insulators and bipolarons coexist. The two
+phases are separated by a sharp boundary along which an intriguing intermediate
+solution emerges as a kind of compromise between the two solutions.",2111.14663v1
+2007-05-16,Spin-Hall edge spin polarization in a ballistic 2D electron system,"Universal properties of spin-Hall effect in ballistic 2D electron systems are
+addressed. The net spin polarization across the edge of the conductor is second
+order, ~\lambda^2, in spin-orbit coupling constant independent of the form of
+the boundary potential, with the contributions of normal and evanescent modes
+each being ~ \sqrt{\lambda} but of opposite signs. This general result is
+confirmed by the analytical solution for a hard-wall boundary, which also
+yields the detailed distribution of the local spin polarization. The latter
+shows fast (Friedel) oscillations with the spin-orbit coupling entering via the
+period of slow beatings only. Long-wavelength contributions of evanescent and
+normal modes exactly cancel each other in the spectral distribution of the
+local spin density.",0705.2424v3
+2008-04-17,Spin-selective localization due to intrinsic spin-orbit coupling,"We study spin-dependent diffusive transport in the presence of a tunable
+spin-orbit (SO) interaction in a two-dimensional electron system. The spin
+precession of an electron in the SO coupling field is expressed in terms of a
+covariant curvature, affecting the quantum interference between different
+electronic trajectories. Controlling this curvature field by modulating the SO
+coupling strength and its gradients by, e.g., electric or elastic means, opens
+intriguing possibilities for exploring spin-selective localization physics. In
+particular, applying a weak magnetic field allows the control of the electron
+localization independently for two spin directions, with the spin-quantization
+axis that could be ""engineered"" by appropriate SO interaction gradients.",0804.2706v3
+2013-05-15,Anomalous and Spin Hall Effects in a Magnetic Tunnel Junction with Rashba Spin-Orbit Coupling,"Anomalous and spin Hall effects are investigated theoretically for a magnetic
+tunnel junction where the applied voltage produces a Rashba spin-or bit
+coupling within the tunneling barrier layer. The ferromagnetic electrodes are
+the source of the spin-polarized current. The tunneling electrons experience a
+spin-orbit coupling inside the barrier due to the applied electrical field.
+Charge and spin Hall currents are calculated as functions of the position
+inside the barrier and the angle between the magnetizations of the electrodes.
+We find that both charge and spin Hall currents are located inside the barrier
+near the in terfaces. The dependence of the currents on magnetic configuration
+of the magnetic tunnel junction makes possible the manipulation by the Hall
+currents via rotation of the magnetization of the electrodes.",1305.3467v1
+2017-02-05,Spin-polarized transport in helical membranes due to spin-orbit coupling,"The spin-dependent electron transmission through a helical membrane with
+account of linear spin-orbit interaction has been investigated by numerically
+solving the Schr\""odinger equation in cylindrical coordinates . It is shown
+that the spin precession is affected by the magnitude of geometric parameters
+and chirality of the membrane. This effect is also explained analytically by
+using the perturbation theory in the weak coupling regime. In the strong
+coupling regime, the current spin polarization is evident when the number of
+the open modes in leads is larger than that of the open channels in the
+membrane. Moreover, we find that the chirality of the helical membrane can
+determine the orientation of current spin polarization. Therefore, one may get
+totally opposite spin currents from the helical membranes rolled against
+different directions.",1702.01375v1
+2014-06-20,Spin-valley filtering in strained graphene structures with artificially induced carrier mass and spin-orbit coupling,"The interplay of massive electrons with spin-orbit coupling in bulk graphene
+results in a spin-valley dependent gap. Thus, a barrier with such properties
+can act as a filter, transmitting only opposite spins from opposite valleys. In
+this Letter we show that strain induced pseudomagnetic field in such a barrier
+will enforce opposite cyclotron trajectories for the filtered valleys, leading
+to their spatial separation. Since spin is coupled to the valley in the
+filtered states, this also leads to spin separation, demonstrating a
+spin-valley filtering effect. The filtering behavior is found to be
+controllable by electrical gating as well as by strain.",1406.5443v2
+2022-04-15,Quantum control of hole spin qubits in double quantum dots,"Hole spin qubits in semiconductor quantum dots (QDs) are promising candidates
+for quantum information processing due to their weak hyperfine coupling to
+nuclear spins, and to the strong spin-orbit coupling which allows for rapid
+operation time. We propose a coherent control on two heavy-hole spin qubits in
+a double QD by a fast adiabatic driving protocol, which helps to achieve higher
+fidelities than other experimentally commonly used protocols as linear ramping,
+$\pi$-pulses or Landau-Zener passages. Using fast quasiadiabatic driving via
+spin-orbit coupling, it is possible to reduce charge noise significantly for
+qubit manipulation and achieve high robustness for the qubit initialization. We
+also implement one and two-qubit gates, in particular, NOT, CNOT, and SWAP-like
+gates, of hole spins in a double QD achieving fidelities above $99\%$,
+exhibiting the capability of hole spins to implement universal gates for
+quantum computing.",2204.07453v2
+2023-07-19,Spin-valley dependent double Andreev reflections in the proximitized graphene/superconductor junction,"We study the Andreev reflections and the quantum transport in the
+proximitized graphene/superconductor junction. The proximitized graphene
+possesses the pseudospin staggered potential and the intrinsic spin-orbit
+coupling induced by substrate, which are responsible for the spin-valley
+dependent double Andreev reflections and the anomalous transport properties in
+the junction. The pure specular Andreev reflection can happen in the
+superconducting gap for the $K\uparrow$ and $K'\downarrow$ electrons while the
+pure retro-Andreev reflection happens for the $K\downarrow$ and $K'\uparrow$
+electrons. The coexisting two types of Andreev reflections related to the fixed
+spin-valley indices strongly depend on the chemical potential of the
+proximitized graphene. The condition of the emergence of the specific type of
+Andreev reflection for the electrons with the fixed spin-valley index is
+clarified. The spin-valley dependent Andreev reflections bring about the
+peculiar conductance spectra of the junction, which can help determine the
+values of the pseudospin staggered potential and the intrinsic spin-orbit
+coupling induced in graphene. Hence, our research results not only provide an
+experimental method to detect the induced potential and coupling in graphene
+but also establish the foundation of the superconductor electronics based on
+the spin-valley indices.",2307.09833v1
+2023-10-15,A singlet-triplet hole-spin qubit in MOS silicon,"Holes in silicon quantum dots are promising for spin qubit applications due
+to the strong intrinsic spin-orbit coupling. The spin-orbit coupling produces
+complex hole-spin dynamics, providing opportunities to further optimize spin
+qubits. Here, we demonstrate a singlet-triplet qubit using hole states in a
+planar metal-oxide-semiconductor double quantum dot. We observe rapid qubit
+control with singlet-triplet oscillations up to 400 MHz. The qubit exhibits
+promising coherence, with a maximum dephasing time of 600 ns, which is enhanced
+to 1.3 us using refocusing techniques. We investigate the magnetic field
+anisotropy of the eigenstates, and determine a magnetic field orientation to
+improve the qubit initialisation fidelity. These results present a step forward
+for spin qubit technology, by implementing a high quality singlet-triplet
+hole-spin qubit in planar architecture suitable for scaling up to 2D arrays of
+coupled qubits.",2310.09722v1
+2002-06-14,Intersubband spin-density excitations in quantum wells with Rashba spin splitting,"In inversion-asymmetric semiconductors, spin-orbit coupling induces a
+k-dependent spin splitting of valence and conduction bands, which is a
+well-known cause for spin decoherence in bulk and heterostructures.
+Manipulating nonequilibrium spin coherence in device applications thus requires
+understanding how valence and conduction band spin splitting affects carrier
+spin dynamics. This paper studies the relevance of this decoherence mechanism
+for collective intersubband spin-density excitations (SDEs) in quantum wells. A
+density-functional formalism for the linear spin-density matrix response is
+presented that describes SDEs in the conduction band of quantum wells with
+subbands that may be non-parabolic and spin-split due to bulk or structural
+inversion asymmetry (Rashba effect). As an example, we consider a 40 nm
+GaAs/AlGaAs quantum well, including Rashba spin splitting of the conduction
+subbands. We find a coupling and wavevector-dependent splitting of the
+longitudinal and transverse SDEs. However, decoherence of the SDEs is not
+determined by subband spin splitting, due to collective effects arising from
+dynamical exchange and correlation.",0206251v1
+2014-04-01,BCS-BEC crossover and quantum phase transition in an ultracold Fermi gas under spin-orbit coupling,"In this work, we study the BCS-BEC crossover and quantum phase transition in
+a Fermi gas under Rashba spin-orbit coupling close to a Feshbach resonance. By
+adopting a two-channel model, we take into account of the closed channel
+molecules, and show that combined with spin-orbit coupling, a finite background
+scattering in the open channel can lead to two branches of solution for both
+the two-body and the many-body ground states. The branching of the two-body
+bound state solution originates from the avoided crossing between bound states
+in the open and the closed channels, respectively. For the many-body states, we
+identify a quantum phase transition in the upper branch regardless of the sign
+of the background scattering length, which is in clear contrast to the case
+without spin-orbit coupling. For systems with negative background scattering
+length in particular, we show that the bound state in the open channel, and
+hence the quantum phase transition in the upper branch, are induced by
+spin-orbit coupling. We then characterize the critical detuning of the quantum
+phase transition for both positive and negative background scattering lengths,
+and demonstrate the optimal parameters for the critical point to be probed
+experimentally.",1404.0140v2
+2015-03-09,Dual gate control of bulk transport and magnetism in the spin-orbit insulator Sr2IrO4,"The 5d iridates have been the subject of much recent attention due to the
+predictions of a large array of novel electronic phases driven by twisting
+strong spin-orbit coupling and Hubbard correlation. As a prototype, the single
+layered perovskite Sr2IrO4 was first revealed to host a Jeff=1/2 Mott
+insulating state. In this material, the approximate energy scale of a variety
+of interactions, involving spin-orbit coupling, magnetic exchange interaction,
+and the Mott gap, allows close coupling among the corresponding physical
+excitations, opening the possibility of cross control of the physical
+properties. Here, we experimentally demonstrate the effective gate control of
+both the transport and magnetism in a Sr2IrO4-based field effect transistor
+using an ionic liquid dielectric. This approach could go beyond the
+surface-limited field effect seen in conventional transistors, reflecting the
+unique aspect of the Jeff=1/2 state. The simultaneous modulation of conduction
+and magnetism confirms the proposed intimate coupling of charge, orbital, and
+spin degrees of freedom in this oxide. These phenomena are probably related to
+an enhanced deviation from the ideal Jeff=1/2 state due to the gate-promoted
+conduction. The present work would have important implications in modelling the
+unusual physics enabled by strong spin-orbit coupling, and provides a new route
+to explore those emergent quantum phases in iridates.",1503.02513v1
+2016-04-20,Vector chirality for effective total momentum $J_{\textrm{eff}}$ in a nonfrustrated Mott insulator: Effects of strong spin-orbit coupling and broken inversion symmetry,"I propose the emergence of the spin-orbital-coupled vector chirality in a
+non-frustrated Mott insulator with the strong spin-orbit coupling due to
+$ab$-plane's inversion-symmetry (IS) breaking. I derive the superexchange
+interactions for a $t_{2g}$-orbital Hubbard model on a square lattice with the
+strong spin-orbit coupling and the IS-breaking-induced hopping integrals, and
+explain the microscopic origins of the Dzyaloshinsky-Moriya (DM) -type and the
+Kitaev-type interactions. Then, by adopting the mean-field approximation to a
+minimal model including only the Heisenberg-type and the DM-type
+nearest-neighbor interactions, I show that the IS breaking causes the
+spin-orbital-coupled chirality as a result of stabilizing the screw state. I
+also highlight the limit of the hard-pseudospin approximation in discussing the
+stability of the screw states in the presence of both the DM-type and the
+Kitaev-type interactions, and discuss its meaning. I finally discuss the
+effects of tetragonal crystal field and $J_{\textrm{eff}}=\frac{3}{2}$ states,
+and the application to the iridates near the $[001]$ surface of
+Sr$_{2}$IrO$_{4}$ and the interface between Sr$_{2}$IrO$_{4}$ and
+Sr$_{3}$Ir$_{2}$O$_{7}$.",1604.05867v3
+2016-08-19,Scattering framework for two particles with isotropic spin-orbit coupling applicable to all energies,"Previous work developed a K-matrix formalism applicable to positive energies
+for the scattering between two $s$-wave interacting particles with two internal
+states, isotropic spin-orbit coupling and vanishing center-of-mass momentum [H.
+Duan, L. You and B. Gao, Phys. Rev A {\bf{87}}, 052708 (2013)]. This work
+extends the formalism to the entire energy regime. Explicit solutions are
+obtained for the total angular momentum $J=0$ and $1$ channels. The behavior of
+the partial cross sections in the negative energy regime is analyzed in detail.
+We find that the leading contributions to the partial cross sections at the
+negative energy thresholds are governed by the spin-orbit coupling strength
+$k_{\text{so}}$ and the mass ratio. The fact that these contributions are
+independent of the two-body scattering length $a_s$ is a direct consequence of
+the effective reduction of the dimensionality, and hence of the density of
+states, near the scattering thresholds due to the single-particle spin-orbit
+coupling terms. The results are analytically continued to the energy regime
+where bound states exist. It is shown that our results are consistent with
+results obtained by alternative approaches. Our formulation, which can be
+regarded as an extension of the standard textbook partial wave decomposition,
+can be generalized to two-body systems with other types of spin-orbit coupling,
+including cases where the center-of-mass momentum does not vanish.",1608.05753v1
+2020-11-22,Master's Thesis: Excitation Spectrum of a Weakly Interacting Spin-Orbit Coupled Bose-Einstein Condensate,"A weakly interacting, spin-orbit coupled, two-component, ultracold Bose gas
+bound to a Bravais lattice is studied. Motivated by recent experimental
+advances in the field of synthetically spin-orbit coupled, ultracold, neutral
+atomic gases showing Bose-Einstein condensation, an analytic framework with
+which to describe such systems in the superfluid regime is presented. This is
+applied to a Rashba spin-orbit-coupled Bose gas in a two-dimensional optical
+lattice. The exotic nature of Bose-Einstein condensation in the presence of
+spin-orbit coupling is an interesting study by itself. Additionally, when the
+optical lattice is introduced, the system provides a highly controllable
+experimental testing ground for numerous condensed matter physics phenomena.
+Five phases of the system are considered, and their excitation spectra,
+critical superfluid velocities and free energies are found. In obtaining the
+free energy, the effects of terms in the Hamiltonian that are linear in
+excitation operators are included, and such terms have not been studied
+previously in this context. Minimization of the free energy at zero temperature
+is used to confirm the phase diagrams reported in the literature, where it has
+usually been obtained by neglecting the effect of excitations. The plane and
+stripe wave phases in the phase diagram are bosonic analogues of
+Fulde-Ferrell-Larkin-Ovchinnikov states in superconductors involving nonzero
+condensate momenta.",2011.10999v1
+2021-06-22,Effects of spin-orbit coupling and magnetic field on electronic properties of Germanene structure,"In this paper, we present a Kane-Mele model in the presence of magnetic field
+and next nearest neighbors hopping amplitudes for investigations the electronic
+and optical properties of monolayer Germanene. Specially, we address the
+dynamical conductivity of the structure as a function of photon frequency and
+in the presence of magnetic field and spin-orbit coupling at finite
+temperature. Using linear response theory and Green's function approach, the
+frequency dependence of optical conductivity has been obtained in the context
+of Kane-Mele model Hamiltonian. Our results show a finite Drude response at low
+frequency at non zero value for magnetic field in the presence of spin-orbit
+coupling. However Drude weight gets remarkable amount in the presence of
+electron doping. The thermal conductivity and specific heat increase with
+increasing the temperature at low amounts of temperature due to the increasing
+of thermal energy of charge carriers and excitation of them to the conduction
+bands. The results for Seebeck coefficient show the sign of thermopower is
+negative in the presence of spin-orbit coupling. Also we have studied the
+temperature dependence of electrical conductivity of Germanene monolayer due to
+both spin orbit coupling and magnetic field factors in details.",2106.11967v1
+2021-12-03,Solar System Dynamics and Multiyear Droughts of the Western USA,"The recent addition of orbit-spin coupling torques to atmospheric global
+circulation models has enabled successful years-in-advance forecasts of global
+and regional-scale dust storms on Mars. Here we explore the applicability of
+the orbit-spin coupling mechanism for understanding and forecasting anomalous
+weather and climate events on Earth. We calculate the time history of
+orbit-spin coupling torques on the Earth system for the interval from
+1860-2040. The torque exhibits substantial variability on decadal to bidecadal
+timescales. Deep minima recur at intervals from 15-26 years; eight such
+episodes are documented within the study period prior to 2020. Each of the
+identified torque minima corresponds in time to an episode of widespread
+drought in the Western USA extending over several years. The multiyear droughts
+of the 1930s, the 1950s, the mid-1970s, the early 1990s, and of 2011-2015 were
+each coincident in time with orbit-spin coupling torque minima. The upcoming
+torque minimum of 2030 is the deepest such minimum of the 180-yr study
+interval. A multiyear episode of widespread drought in the Western USA is
+likely to be underway by 2028 plus or minus 4 years (2 standard deviations).
+The potential benefits to societies of improved drought predictions justify an
+immediate high-priority effort to include forcing by orbit-spin coupling within
+state-of-the-art Earth system GCMs. Future targeted numerical modeling
+investigations are likely to yield forecasts with considerably lower
+uncertainties and with much improved temporal resolution in comparison to that
+obtained here.",2112.02186v1
+2022-03-06,Superfluidity of a Raman spin-orbit-coupled Bose gas at finite temperature,"We investigate the superfluidity of a three-dimensional weakly interacting
+Bose gas with a one-dimensional Raman-type spin-orbit coupling at both zero and
+finite temperatures. Using the imaginary-time Green's function within the
+Bogoliubov approximation, we explicitly derive analytic expressions of the
+current-current response functions in the plane-wave and zero-momentum phases,
+from which we extract the superfluid density in the limits of long wavelength
+and zero frequency. At zero temperature, we check that the resultant superfluid
+density agrees exactly with our previous analytic prediction obtained from a
+phase-twist approach. Both results also satisfy a generalized Josephson
+relation in the presence of spin-orbit coupling. At finite temperature, we find
+a significant non-monotonic temperature dependence of superfluid density near
+the transition from the plane-wave phase to the zero-momentum phase. We show
+that this non-trivial behavior might be understood from the sound velocity,
+which has a similar temperature dependence. The non-monotonic temperature
+dependence is also shared by Landau critical velocity, above which the
+spin-orbit-coupled Bose gas loses its superfluidity. Our results would be
+useful for further theoretical and experimental studies of superfluidity in
+exotic spin-orbit coupled quantum gases.",2203.02921v1
+2022-03-30,Large Rashba Spin-Orbit Coupling and High-Temperature Quantum Anomalous Hall Effect in Re-Intercalated Graphene/CrI$_3$ Heterostructure,"In 2010, quantum anomalous Hall effect (QAHE) in graphene was proposed in the
+presence of Rashba spin-orbit coupling and ferromagnetic exchange field. After
+a decade's experimental exploration, the anomalous Hall conductance can only
+reach about 0.25 in the units of $2e^2/h$, which was attributed to the tiny
+Rashba spin-orbit coupling. Here, we theoretically show that Re-intercalation
+in graphene/CrI$_3$ heterostructure can not only induce sizeable Rashba
+spin-orbit coupling ($>$ 40~meV), but also open up large band gaps at valleys
+$K$ (22.2 meV) and $K' $ (30.3 meV), and a global band gap over 5.5 meV (19.5
+meV with random Re distribution) hosting QAHE. A low-energy continuum model is
+constructed to explain the underlying physical mechanism. We find that Rashba
+spin-orbit coupling is robust against external stress whereas a tensile strain
+can increase the global bulk gap. Furthermore, we also show that
+Re-intercalated graphene with hexagonal boron-nitride can also realize QAHE
+with bulk gap over 40~meV, indicating the tunability of $5d$-intercalated
+graphene-based heterostructure. Our finding makes a great leap towards the
+experimental realization of graphene-based QAHE, and will definitely accelerate
+the practical application of graphene-based low-power electronics.",2203.16429v1
+2022-07-18,Multifractally-enhanced superconductivity in two-dimensional systems with spin-orbit coupling,"The interplay of Anderson localization and electron-electron interactions is
+known to lead to enhancement of superconductivity due to multifractality of
+electron wave functions. We develop the theory of multifractally-enhanced
+superconducting states in two-dimensional systems in the presence of spin-orbit
+coupling. Using the Finkel'stein nonlinear sigma model, we derive the modified
+Usadel and gap equations that take into account renormalizations caused by the
+interplay of disorder and interactions. Multifractal correlations induce energy
+dependence of the superconducting spectral gap. We determine the
+superconducting transition temperature and the superconducting spectral gap in
+the case of Ising and strong spin orbit couplings. In the latter case the
+energy dependence of superconducting spectral gap is convex whereas in the
+former case (as well as in the absence of spin-orbit coupling) it is concave.
+Multifractality enhances not only the transition temperature but, in the same
+way, the spectral gap at zero temperature. Also we study mesoscopic
+fluctuations of the local density of states in the superconducting state.
+Similarly to the case of normal metal, spin-orbit coupling reduce the amplitude
+of fluctuations.",2207.08594v2
+2022-11-02,Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on WSe2,"New phases of matter can be stabilized by a combination of diverging
+electronic density of states, strong interactions, and spin-orbit coupling.
+Recent experiments in magic-angle twisted bilayer graphene (TBG) have uncovered
+a wealth of novel phases as a result of interaction-driven spin-valley flavour
+polarization. In this work, we explore correlated phases appearing due to the
+combined effect of spin-orbit coupling-enhanced valley polarization and large
+density of states below half filling ($\nu \lesssim 2$) of the moir\'e band in
+a TBG coupled to tungsten diselenide. We observe anomalous Hall effect,
+accompanied by a series of Lifshitz transitions, that are highly tunable with
+carrier density and magnetic field. Strikingly, the magnetization shows an
+abrupt sign change in the vicinity of half-filling, confirming its orbital
+nature. The coercive fields reported are about an order of magnitude higher
+than previous studies in graphene-based moir\'e systems, presumably aided by a
+Stoner instability favoured by the van Hove singularities in the malleable
+bands. While the Hall resistance is not quantized at zero magnetic fields,
+indicative of a ground state with partial valley polarization, perfect
+quantization and complete valley polarization are observed at finite fields.
+Our findings illustrate that singularities in the flat bands in the presence of
+spin-orbit coupling can stabilize ordered phases even at non-integer moir\'e
+band fillings.",2211.01251v1
+2001-01-31,Spin-orbit induced anisotropy in the magnetoconductance of two-dimensional metals,"It is shown that the spin-orbit coupling due to structure inversion asymmetry
+leads to a characteristic anisotropy in the magnetoconductance of
+two-dimensional metals. Relevance for recent experiments is discussed.",0101473v1
+1995-06-02,Spin-rotor Interpretation of Identical Bands and Quantized Alignment in Superdeformed A $\approx$ 190 Nuclei,"The ``identical'' bands in superdeformed mercury, thallium, and lead nuclei
+are interpreted as examples of orbital angular momentum rotors with the weak
+spin-orbit coupling of pseudo-$SU(3)$ symmetries and supersymmetries.",9506001v1
+2017-03-08,Electron Spin Relaxation in a Transition-Metal Dichalcogenide Quantum Dot,"We study the relaxation of a single electron spin in a circular quantum dot
+in a transition-metal dichalcogenide monolayer defined by electrostatic gating.
+Transition-metal dichalcogenides provide an interesting and promising arena for
+quantum dot nano-structures due to the combination of a band gap, spin-valley
+physics and strong spin-orbit coupling. First we will discuss which bound state
+solutions in different B-field regimes can be used as the basis for qubits
+states. We find that at low B-fields combined spin-valley Kramers qubits to be
+suitable, while at large magnetic fields pure spin or valley qubits can be
+envisioned. Then we present a discussion of the relaxation of a single electron
+spin mediated by electron-phonon interaction via various different relaxation
+channels. In the low B-field regime we consider the spin-valley Kramers qubits
+and include impurity mediated valley mixing which will arise in disordered
+quantum dots. Rashba spin-orbit admixture mechanisms allows for relaxation by
+in-plane phonons either via the deformation potential or by piezoelectric
+coupling, additionally direct spin-phonon mechanisms involving out-of-plane
+phonons give rise to relaxation. We find that the relaxation rates scale as
+$\propto B^6$ for both in-plane phonons coupling via deformation potential and
+the piezoelectric effect, while relaxation due to the direct spin-phonon
+coupling scales independant to B-field to lowest order but scales strongly on
+device mechanical tension. We will also discuss the relaxation mechanisms for
+pure spin or valley qubits formed in the large B-field regime.",1703.02751v1
+2017-12-20,Magnetic field effects on a nanowire with inhomogeneous Rashba spin-orbit coupling: Spin properties at equilibrium,"By modeling a Rashba nanowire contacted to leads via an inhomogeneous
+spin-orbit coupling profile, we investigate the equilibrium properties of the
+spin sector when a uniform magnetic field is applied along the nanowire axis.
+We find that the interplay between magnetic field and Rashba coupling generates
+a spin current, polarised perpendicularly to the applied field and flowing
+through the nanowire even at equilibrium. In the nanowire bulk such effect
+persists far beyond the regime where the nanowire mimics the helical states of
+a quantum spin Hall system, while in the leads the spin current is suppressed.
+Furthermore, despite the nanowire not being proximized by superconductors, at
+the interfaces with the leads we predict the appearance of localized spin
+torques and spin polarizations, orthogonal to the magnetic field and partially
+penetrating into the leads. This feature, due to the inhomogeneity of the
+Rashba coupling, suggests to use caution in interpreting spin polarization as
+signatures of Majorana fermions. When the magnetic field has a component also
+along the Rashba field, its collinearity with the spin polarization and
+orthogonality to the spin current are violated in the nanowire bulk too. We
+analyze these quantities in terms of the magnetic field and chemical potential
+for both long and short nanowires in experimentally realistic regimes.",1712.07536v2
+2018-10-15,Spin current generation and relaxation in a quenched spin-orbit-coupled Bose-Einstein condensate,"Understanding the effects of spin-orbit coupling (SOC) and many-body
+interactions on spin transport is important in condensed matter physics and
+spintronics. This topic has been intensively studied for spin carriers such as
+electrons but barely explored for charge-neutral bosonic quasiparticles
+(including their condensates), which hold promises for coherent spin transport
+over macroscopic distances. Here, we explore the effects of synthetic SOC
+(induced by optical Raman coupling) and atomic interactions on the spin
+transport in an atomic Bose-Einstein condensate (BEC), where the spin-dipole
+mode (SDM, actuated by quenching the Raman coupling) of two interacting spin
+components constitutes an alternating spin current. We experimentally observe
+that SOC significantly enhances the SDM damping while reducing the
+thermalization (the reduction of the condensate fraction). We also observe
+generation of BEC collective excitations such as shape oscillations. Our theory
+reveals that the SOC-modified interference, immiscibility, and interaction
+between the spin components can play crucial roles in spin transport.",1810.06504v2
+2014-08-05,Tuning spin orbit interaction in high quality gate-defined InAs one-dimensional channels,"Spin-orbit coupling in solids describes an interaction between an electron's
+spin, an internal quantum-mechanical degree of freedom, with its linear
+momentum, an external property. Spin-orbit interaction, due to its relativistic
+nature, is typically small in solids, and is often taken into account
+perturbatively. It has been recently realized, however, that materials with
+strong spin-orbit coupling can lead to novel states of matter such as
+topological insulators and superconductors. This exciting development might
+lead to a number of useful applications ranging from spintronics to quantum
+computing. In particular, theory predicts that narrow band gap semiconductors
+with strong spin-obit coupling are a suitable platform for the realization of
+Majorana zero-energy modes, predicted to obey exotic non-Abelian braiding
+statistics. The pursuit for realizing Majorana modes in condensed matter
+systems and investigating their exotic properties has been a subject of
+intensive experimental research recently. Here, we demonstrate the first
+realization of gate-defined wires where one-dimensional confinement is created
+using electrostatic potentials, on large area InAs two dimensional electron
+systems (2DESs). The electronic properties of the parent 2DES are fully
+characterized in the region that wires are formed. The strength of the
+spin-orbit interaction has been measured and tuned while the high mobility of
+the 2DES is maintained in the wire. We show that this scheme could provide new
+prospective solutions for scalable and complex wire networks.",1408.1122v1
+2019-03-16,Induced exchange and spin-orbit effects by proximity in graphene on Ni and Co,"The induced-proximity effects of nearly commensurate lattice structure of a
+graphene layer on Ni(111) and Co(0001) substrates in the AC stacking
+configuration are addressed through an analytical tight-binding approach within
+the Slater-Koster method. A minimal Hamiltonian is constructed by considering
+the hybridizations of the magnetic $3d$-orbitals of Ni(Co) atoms with the
+$p_z$-orbitals of graphene, in addition to the atomic spin-orbit coupling and
+the magnetization of the Ni(Co) atoms. A low-energy effective Hamiltonian for
+graphene/Ni(Co) describing the perturbed $\pi$-bands in the vicinity of the
+Dirac points is derived which enable us to get further insight on the physical
+nature of the induced-effective couplings to the graphene layer. It is shown
+that a magneto-spin-orbit type effect may emerge through two competing
+mechanisms simultaneously present, namely the proximity induced exchange and
+Rashba spin-orbit interaction. Such effects results in giant exchange
+splittings and robust Rashba spin-orbit coupling transferred to the graphene
+layer in agreement with recent density functional theory calculations and
+experimental observations. We further analyze the physical conditions for the
+appearance of intact Dirac cones in the minority spin bands as observed by
+recent photoemission measurements with spin resolution.",1903.06959v1
+2021-07-20,"Magnetic topology in coupled binaries, spin-orbital resonances, and flares","We consider topological configurations of the magnetically coupled spinning
+stellar binaries (e.g., merging neutron stars or interacting star-planet
+systems). We discuss conditions when the stellar spins and the orbital motion
+nearly `compensate' each other, leading to very {\it slow} overall winding of
+the coupled magnetic fields; slowly winding configurations allow gradual
+accumulation of magnetic energy, that is eventually released in a flare when
+the instability threshold is reached. We find that this slow winding can be
+global and/or local. We describe the topology of the relevant space
+$\mathbb{F}=T^1S^2$ as the unit tangent bundle of the two-sphere and find
+conditions for slowly winding configurations in terms of magnetic moments,
+spins and orbital momentum. These conditions become ambiguous near the
+topological bifurcation points; in certain cases they also depend on the
+relative phases of the spin and orbital motions. In the case of merging
+magnetized neutron stars, if one of the stars is a millisecond pulsar, spinning
+at $\sim$ 10 msec, the global resonance $\omega_1+\omega_2= 2 \Omega$
+(spin-plus beat is two times the orbital period) occurs approximately a second
+before the merger; the total energy of the flare can be as large as $10\%$ of
+the total magnetic energy, producing bursts of luminosity $\sim 10^{44}$ erg
+s$^{-1}$. Higher order local resonances may have similar powers, since the
+amount of involved magnetic flux tubes may be comparable to the total connected
+flux.",2107.09702v3
+2007-04-03,Spin-orbit coupling effect on the persistent currents in mesoscopic ring with an Anderson impurity,"Based on the finite $U$ slave boson method, we have investigated the effect
+of Rashba spin-orbit(SO) coupling on the persistent charge and spin currents in
+mesoscopic ring with an Anderson impurity. It is shown that the Kondo effect
+will decrease the magnitude of the persistent charge and spin currents in this
+side-coupled Anderson impurity case. In the presence of SO coupling, the
+persistent currents change drastically and oscillate with the strength of SO
+coupling. The SO coupling will suppress the Kondo effect and restore the abrupt
+jumps of the persistent currents. It is also found that a persistent spin
+current circulating the ring can exist even without the charge current in this
+system.",0704.0319v1
+2018-09-12,Topological phases in pseudospin-1 Fermi gases with two-dimensional spin-orbit coupling,"The recent experimental realization of spin-orbit (SO) coupling for ultracold
+bosons and fermions opens an exciting avenue for engineering quantum matter
+that may be challenging to realize in solid state materials such as SO coupled
+spin-1 fermions. While one-dimensional SO coupling for spin-1 bosons has been
+experimentally realized, the generation of two-dimensional (2D) SO coupling and
+its topological properties are largely unexplored. Here we propose an
+experimental scheme for realizing a 2D Dresselhaus-type SO coupling in a square
+lattice for spin-1 Fermi gases. Because of the extended spin degree of freedom,
+many interesting topological phases could exist without relying on lattice
+point group symmetries that are crucial in solid state materials. These exotic
+phases include triply-degenerate points, quadratic band touching, a large Chern
+number ($C=5$) superfluid with 5 Majorana modes, triple-Weyl fermions, etc. Our
+scheme can be generalized to larger spins and provides a new route for
+engineering topological quantum matter by utilizing large spin degrees of
+freedom, instead of specific lattice symmetries.",1809.04537v2
+2006-08-11,Magnetic and orbital correlations in a two-site molecule,"We analyze the role of orbital degeneracy in possible magnetic and orbital
+instabilities by solving exactly a two-site molecule with two orbitals of
+either $e_g$ or $t_{2g}$ symmetry at quarter-filling. As a generic feature of
+both models one finds that the spin and orbital correlations have opposite
+signs in the low temperature regime when the orbitals are degenerate, in
+agreement with the Goodenough-Kanamori rules. While Hund's exchange coupling
+$J_H$ induces ferromagnetic spin correlations in both models, it is more
+efficient for $t_{2g}$ orbitals where the orbital quantum number is conserved
+along the hopping processes. We show that the ground state and finite
+temperature properties may change even qualitatively with increasing Coulomb
+interaction when the crystal field splitting of the two orbitals is finite, and
+the Goodenough-Kanamori rules may not be followed.",0608271v1
+2007-01-22,Orbital order in ZnV$_2$O$_4$,"In view of recent controversy regarding the orbital order in the frustrated
+spinel ZnV2O4, we analyze the orbital and magnetic groundstate of this system
+within an ab initio density functional theory approach. While LDA+U
+calculations in the presence of a cooperative Jahn-Teller distortion stabilize
+an A-type staggered orbital order, the consideration of relativistic spin-orbit
+effects unquenches the orbital moment and leads to a uniform orbital order with
+a net magnetic moment close to the experimental one. Our results show that ab
+initio calculations are able to resolve the existing discrepancies in previous
+theories and that it is the spin-orbit coupling alongwith electronic
+correlations which play a significant role in determining the orbital structure
+in these materials.",0701528v2
+2023-05-02,Orbital Hall effect in mesoscopic devices,"We investigate the orbital Hall effect through a mesoscopic device with
+momentum-space orbital texture that is connected to four semi-infinite
+terminals embedded in the Landauer-B\""uttiker configuration for quantum
+transport. We present analytical and numerical evidence that the orbital Hall
+current exhibits mesoscopic fluctuations, which can be interpreted in the
+framework of random matrix theory (RMT) (as with spin Hall current
+fluctuations). The mesoscopic fluctuations of orbital Hall current display two
+different amplitudes of 0.36 and 0.18 for weak and strong spin-orbit coupling,
+respectively. The amplitudes are obtained by analytical calculation via RMT and
+are supported by numerical calculations based on the tight-binding model.
+Furthermore, the orbital Hall current fluctuations lead to two relationships
+between the orbital Hall angle and conductivity. Finally, we confront the two
+relations with experimental data of the orbital Hall angle, which shows good
+concordance between theory and experiment.",2305.01640v2
+2004-11-24,Effect of spin-orbit coupling on zero-conductance resonances in asymmetrically coupled one-dimensional rings,"The influence of Rashba spin-orbit coupling on zero conductance resonances
+appearing in one dimensional ring asymmetrically coupled to two leads is
+investigated. For this purpose, the transmission function of the corresponding
+one-electron scattering problem is derived analytically and analyzed in the
+complex energy plane with focus on the zero-pole structure characteristic of
+transmission (anti)resonances. The lifting of real conductance zeros due to
+spin-orbit coupling in the asymmetric Aharonov-Casher (AC) ring is related to
+the breaking of spin reversal symmetry in analogy to the time-reversal symmetry
+breaking in the asymmetric Aharonov-Bohm (AB) ring.",0411620v2
+2010-04-15,Spin-orbit coupling and anisotropic exchange in two-electron double quantum dots,"The influence of the spin-orbit interactions on the energy spectrum of
+two-electron laterally coupled quantum dots is investigated. The effective
+Hamiltonian for a spin qubit pair proposed in F. Baruffa et al., Phys. Rev.
+Lett. 104, 126401 (2010) is confronted with exact numerical results in single
+and double quantum dots in zero and finite magnetic field. The anisotropic
+exchange Hamiltonian is found quantitatively reliable in double dots in
+general. There are two findings of particular practical importance: i) The
+model stays valid even for maximal possible interdot coupling (a single dot),
+due to the absence of a coupling to the nearest excited level, a fact following
+from the dot symmetry. ii) In a weak coupling regime, the Heitler-London
+approximation gives quantitatively correct anisotropic exchange parameters even
+in a finite magnetic field, although this method is known to fail for the
+isotropic exchange. The small discrepancy between the analytical model (which
+employes the linear Dresselhaus and Bychkov-Rashba spin-orbit terms) and the
+numerical data for GaAs quantum dots is found to be mostly due to the cubic
+Dresselhaus term.",1004.2610v2
+2021-03-01,Evolution of Majorona zero-energy edge states in a $T^2 = -1$ symmetry protected 1D topological superconductor with dominant spin-orbit coupling,"We consider a 1D topological superconductor (TSC) constructed by coupling a
+pair of Kitaev's Majorana chains with opposite spin configurations. Such a 1D
+lattice model is known to be protected by a $T^2 = -1$ time-reversal symmetry.
+Furthermore, we consider a modeled Rashba spin-orbit coupling on such a system
+of $T^2=-1$ time-reversal symmetric TSC. The Rashba spin-orbit coupling
+together with the chemical potential engineered the phase transitions of the
+edge states in the system and consequently the number of Majorona's zero-energy
+edge modes (MZM's) emerging at the edge of the coupled chains. Correspondingly,
+the topological nature of the system is described by a phase diagram consisting
+of three different phases. The three phases are characterized by a topological
+winding number, $\mathcal{W}=1$, $2$ (with one and two MZM's: topological
+phases) and $\mathcal{W}=0$ (devoid of any MZM: trivial insulating phase).",2103.00960v1
+2021-04-24,Spin-orbit-coupled fluids of light in bulk nonlinear media,"We show that nonparaxial polarized light beams propagating in a bulk
+nonlinear Kerr medium naturally exhibit a coupling between the motional and the
+polarization degrees of freedom, realizing a spin-orbit-coupled mixture of
+fluids of light. We investigate the impact of this mechanism on the Bogoliubov
+modes of the fluid, using a suitable density-phase formalism built upon a
+linearization of the exact Helmholtz equation. The Bogoliubov spectrum is found
+to be anisotropic, and features both low-frequency gapless branches and
+high-frequency gapped ones. We compute the amplitudes of these modes and
+propose a couple of experimental protocols to study their excitation
+mechanisms. This allows us to highlight a phenomenon of hybridization between
+density and spin modes, which is absent in the paraxial description and
+represents a typical fingerprint of spin-orbit coupling.",2104.11982v2
+2010-04-27,Construction of a Microscopic Model for Yb and Tm Compounds on the Basis of a $\mib{j}$-$\mib{j}$ Coupling Scheme,"We provide a prescription to construct a microscopic model for heavy
+lanthanide systems such as Yb and Tm compounds by exploiting a $j$-$j$ coupling
+scheme. Here we consider a situation with a large spin-orbit coupling, in which
+$j$=5/2 sextet is fully occupied, while $j$=7/2 octet is partially occupied,
+where $j$ denotes total angular momentum. We evaluate crystalline electric
+field potentials and Coulomb interactions among the states of the $j$=7/2 octet
+to construct a local Hamiltonian in the $j$-$j$ coupling scheme. Then, it is
+found that the local $f$-electron states composed of the $j$=7/2 octet agree
+quite well with those of seven $f$ orbitals even for a realistic value of the
+spin-orbit coupling. As an example of the application of the present model, we
+discuss low-temperature multipole states of Yb- and Tm-based filled
+skutterudites by analyzing multipole susceptibility of the Anderson model in
+the $j$-$j$ coupling scheme with the use of a numerical renormalization group
+technique. From the comparison with the numerical results of the seven-orbital
+Anderson model, it is concluded that the multipole state is also well
+reproduced by the $j$-$j$ coupling model, even when we include the
+hybridization between conduction and $f$ electrons for the realistic value of
+the spin-orbit coupling. Finally, we briefly discuss future applications of the
+present prescription for theoretical research on heavy lanthanide compounds.",1004.4707v1
+2019-12-06,Synthetic spin-orbit coupling mediated by a bosonic environment,"We study a mobile quantum impurity, possessing internal rotational degrees of
+freedom, confined to a ring in the presence of a many-particle bosonic bath. By
+considering the recently introduced rotating polaron problem, we define the
+Hamiltonian and examine the energy spectrum. The weak-coupling regime is
+studied by means of a variational ansatz in the truncated Fock space. The
+corresponding spectrum indicates that there emerges a coupling between the
+internal and orbital angular momenta of the impurity as a consequence of the
+phonon exchange. We interpret the coupling as a phonon-mediated spin-orbit
+coupling and quantify it by using a correlation function between the internal
+and orbital angular momentum operators. The strong-coupling regime is
+investigated within the Pekar approach and it is shown that the correlation
+function of the ground state shows a kink at a critical coupling, that is
+explained by a sharp transition from the non-interacting state to the states
+that exhibit strong interaction with the surroundings. The results might find
+applications in such fields as spintronics or topological insulators, where
+spin-orbit coupling is of crucial importance.",1912.03092v2
+2004-10-24,Spin-Hall conductivity of a disordered 2D electron gas with Dresselhaus spin-orbit interaction,"The spin-Hall conductivity of a disordered 2D electron gas has been
+calculated for an arbitrary spin-orbit interaction. We have found that in the
+diffusive regime of electron transport, in accordance with previous
+calculations, the dc spin-Hall conductivity of a homogeneous system turns to
+zero due to impurity scattering when the spin-orbit coupling is represented
+only by the Rashba interaction. However, when the Dresselhaus interaction is
+taken into account, the spin-Hall current is not zero. We also considered the
+spin-Hall currents induced by an inhomogeneous electric field. It is shown that
+a time dependent electric charge induces a vortex of spin-Hall currents.",0410607v2
+2008-06-02,"Photo-induced, non-equilibrium spin and charge polarization in quantum rings","We investigate the spin-dependent dynamical response of a quantum ring with a
+spin-orbit interaction upon the application of linearly polarized, picosecond,
+asymmetric electromagnetic pulses. The oscillations of the generated dipole
+moment are sensitive to the parity of the occupation number in the ring and to
+the strength of the spin-orbit coupling. It is shown how the associated
+emission spectrum can be controlled via the pulse strength or a gate voltage.
+In addition, we inspect how a static magnetic flux can modify the
+non-equilibrium dynamics. In presence of the spin-orbit interaction and for a
+paramagnetic ring, the applied pulse results in a spin-split, non-equilibrium
+local charge density. The resulting temporal spin polarization is directed
+perpendicular to the light-pulse polarization axis and oscillates periodically
+with the frequency of the spin-split charge density. The spin-averaged
+non-equilibrium charge density possesses a left-right symmetry with respect to
+the pulse polarization axis. The calculations presented here are applicable to
+nano-meter rings fabricated in heterojuctions of III-V and II-VI semiconductors
+containing several hundreds electrons.",0806.0317v1
+2012-07-05,Onsager relations in a two-dimensional electron gas with spin-orbit coupling,"Theory predicts for the two-dimensional electrons gas with only Rashba
+spin-orbit interaction a vanishing spin Hall conductivity and at the same time
+a finite inverse spin Hall effect. We show how these seemingly contradictory
+results are compatible with the Onsager relations: the latter do hold for spin
+and particle (charge) currents in the two-dimensional electron gas, although
+(i) their form depends on the experimental setup and (ii) a vanishing bulk spin
+Hall conductivity does not necessarily imply a vanishing spin Hall effect. We
+also discuss the situation in which extrinsic spin orbit from impurities is
+present and the bulk spin Hall conductivity can be different from zero.",1207.1289v2
+2018-11-13,Atomic-scale tailoring of spin susceptibility via non-magnetic spin-orbit impurities,"Following the discovery of topological insulators, there has been a renewed
+interest in superconducting systems that have strong spin-orbit (SO) coupling.
+Here we address the fundamental question of how the spin properties of a
+otherwise spin-singlet superconducting ground state evolve with increasing SO
+impurity density. We have mapped out the Zeeman critical field phase diagram of
+superconducting Al films that were deposited over random Pb cluster arrays of
+varying density. These phase diagrams give a direct measure of the Fermi liquid
+spin renormalization, as well as the spin orbit scattering rate. We find that
+the spin renormalization is a linear function of the average Pb
+cluster-to-cluster separation and that this dependency can be used to tune the
+spin susceptibility of the Al over a surprisingly wide range from 0.8$\chi_0$
+to 4.0$\chi_0$, where $\chi_0$ is the non-interacting Pauli susceptibility.",1811.05265v1
+2010-04-30,Spin-dependent tunneling into an empty lateral quantum dot,"Motivated by the recent experiments of Amasha {\it et al.} [Phys. Rev. B {\bf
+78}, 041306(R) (2008)], we investigate single electron tunneling into an empty
+quantum dot in presence of a magnetic field. We numerically calculate the
+tunneling rate from a laterally confined, few-channel external lead into the
+lowest orbital state of a spin-orbit coupled quantum dot. We find two
+mechanisms leading to a spin-dependent tunneling rate. The first originates
+from different electronic $g$-factors in the lead and in the dot, and favors
+the tunneling into the spin ground (excited) state when the $g$-factor
+magnitude is larger (smaller) in the lead. The second is triggered by
+spin-orbit interactions via the opening of off-diagonal spin-tunneling
+channels. It systematically favors the spin excited state. For physical
+parameters corresponding to lateral GaAs/AlGaAs heterostructures and the
+experimentally reported tunneling rates, both mechanisms lead to a discrepancy
+of $\sim$10% in the spin up vs spin down tunneling rates. We conjecture that
+the significantly larger discrepancy observed experimentally originates from
+the enhancement of the $g$-factor in laterally confined lead.",1005.0024v2
+2011-01-03,Sublattice asymmetry and spin-orbit interaction induced out-of-plane spin polarization of photoelectrons,"We study theoretically the effect of spin-orbit coupling and sublattice
+asymmetry in graphene on the spin polarization of photoelectrons. We show that
+sublattice asymmetry in graphene not only opens a gap in the band structure but
+in case of finite spin-orbit interaction it also gives rise to an out-of-plane
+spin polarization of electrons close to the Dirac point of the Brillouin zone.
+This can be detected by measuring the spin polarization of photoelectrons and
+therefore spin resolved photoemission spectroscopy can reveal the presence of a
+band gap even if it is too small to be observed directly by angle resolved
+photoemission spectroscopy because of the finite resolution of measurements or
+because the sample is $p$-doped. We present analytical and numerical
+calculations on the energy and linewidth dependence of photoelectron intensity
+distribution and spin polarization.",1101.0624v2
+2011-09-12,Nonadiabatic generation of spin currents in a quantum ring with Rashba and Dresselhaus spin-orbit interactions,"When subjected to a linearly polarized terahertz pulse, a mesoscopic ring
+endowed with spin-orbit interaction (SOI) of the Rashba-Dresselhaus type
+exhibits nonuniform azimuthal charge and spin distributions. Both types of SOI
+couplings are considered linear in the electron momentum. Our results are
+obtained within a formalism based on the equation of motion satisfied by the
+density operator which is solved numerically for different values of the angle
+$\phi$, the angle determining the polarization direction of the laser pulse.
+Solutions thus obtained are later employed in determining the time-dependent
+charge and spin currents, whose values are calculated in the stationary limit.
+Both these currents exhibit an oscillatory behavior complicated in the case of
+the spin current by a beating pattern. We explain this occurrence on account of
+the two spin-orbit interactions which force the electron spin to oscillate
+between the two spin quantization axes corresponding to Rashba and Dresselhaus
+interactions. The oscillation frequencies are explained using the single
+particle spectrum.",1109.2572v1
+2015-06-15,Giant Spin-Orbit-Induced Spin Splitting in Bi Chains on GaAs(110),"The search for one-dimensional electron systems with a giant Rashba-type spin
+splitting is of importance for the application of spin transport. Here we
+report, based on a first-principles density-functional-theory calculation, that
+Bi zigzag chains formed on a heterogeneous GaAs(110) surface have a giant spin
+splitting of surface states. This giant spin splitting is revealed to originate
+from spin-orbit coupling (SOC) and electric dipole interaction that are
+significantly enhanced by (i) the asymmetric surface charge distribution due to
+the strong SOC-induced hybridization of the Bi px , py , and pz orbitals and
+(ii) the large out-of-plane and in-plane potential gradients generated by two
+geometrically and electronically inequivalent Bi atoms bonding to Ga and As
+atoms. The results demonstrate an important implication of the in-plane and
+out-of-plane asymmetry of the Bi/GaAs(110) interface system in producing the
+giant spin splitting with the in-plane and out-of-plane spin components.",1506.04798v2
+2021-03-30,Oxide spin-orbitronics: spin-charge interconversion and topological spin textures,"Quantum oxide materials possess a vast range of properties stemming from the
+interplay between the lattice, charge, spin and orbital degrees of freedom, in
+which electron correlations often play an important role. Historically, the
+spin-orbit coupling was rarely a dominant energy scale in oxides. It however
+recently came to the forefront, unleashing various exotic phenomena connected
+with real and reciprocal-space topology that may be harnessed in spintronics.
+In this article, we review the recent advances in the new field of oxide
+spin-orbitronics with a special focus on spin-charge interconversion from the
+direct and inverse spin Hall and Edelstein effects, and on the generation and
+observation of topological spin textures such as skyrmions. We highlight the
+control of spin-orbit-driven effects by ferroelectricity and give perspectives
+for the field.",2103.16271v1
+2006-08-23,Spin-spin coupling in electrostatically coupled quantum dots,"We study the spin-spin coupling between two single-electron quantum dots due
+to the Coulomb and spin-orbit interactions, in the absence of tunneling between
+the dots. We find an anisotropic XY spin-spin interaction that is proportional
+to the Zeeman splitting produced by the external magnetic field. This
+interaction is studied both in the limit of weak and strong Coulomb repulsion
+with respect to the level spacing of the dot. The interaction is found to be a
+non-monotonic function of inter-dot distance $a_0$ and external magnetic field,
+and, moreover, vanishes for some special values of $a_0$ and/or magnetic field
+orientation. This mechanism thus provides a new way to generate and tune spin
+interaction between quantum dots. We propose a scheme to measure this spin-spin
+interaction based on the spin-relaxation-measurement technique.",0608512v1
+2017-08-14,Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures,"Van-der-Waals heterostructures have become a paradigm for designing new
+materials and devices, in which specific functionalities can be tailored by
+combining the properties of the individual 2D layers. A single layer of
+transition metal dichalcogenide (TMD) is an excellent complement to graphene
+(Gr), since the high quality of charge and spin transport in Gr is enriched
+with the large spin-orbit coupling of the TMD via proximity effect. The
+controllable spin-valley coupling makes these heterostructures particularly
+attractive for spintronic and opto-valleytronic applications. In this work, we
+study spin precession in a monolayer MoSe2/Gr heterostructure and observe an
+unconventional, dramatic modulation of the spin signal, showing one order of
+magnitude longer lifetime of out-of-plane spins (40 ps) compared with that of
+in-plane spins (3.5 ps). This demonstration of a large spin lifetime anisotropy
+in TMD/Gr heterostructures, is a direct evidence of induced spin-valley
+coupling in Gr and provides an accessible route for manipulation of spin
+dynamics in Gr, interfaced with TMDs.",1708.04067v1
+2017-01-06,Spin Analogues of Superconductivity and the Integer Quantum Hall Effect in an Array of Spin Chains,"Motivated by the successful idea of using weakly-coupled quantum electronic
+wires to realize the quantum Hall effects and the quantum spin Hall effects, we
+theoretically construct two systems composed of weakly-coupled quantum spin
+chains, which can exhibit spin analogues of superconductivity and the integer
+quantum Hall effect. Specifically, a certain bilayer of two arrays of
+interacting spin chains is mapped, via the Jordan-Wigner transformation, to a
+negative-$U$ Hubbard model that exhibits superconductivity. In addition, an
+array of spin-orbit-coupled spin chains in the presence of an suitable external
+magnetic field is transformed to an array of quantum wires that exhibits the
+integer quantum Hall effect. The resultant spin superconductivity and spin
+integer quantum Hall effect can be characterized by their ability to transport
+spin without any resistance.",1701.01509v1
+2023-07-31,Generation of charge current by the Inverse Stern-Gerlach Effect and the suppression of spin transport due to spin counter-current exchange in semiconductors,"The spin-orbit interaction is frequently the mechanism by which spin and
+charge are coupled for spintronic applications. The discovery of spin, a
+century ago, relied on spin-charge coupling by a magnetic field gradient; this
+mechanism has received scant attention as a means for generating spin and
+charge currents in semiconductors. Through the derivation of a set of coupled
+spin-charge drift-diffusion equations, our work shows that magnetic field
+gradients can be used to generate charge currents from non-equilibrium spin
+polarization, in solid state systems. We predict, in GaAs, an ``Stern-Gerlach""
+voltage comparable to what is measured by the inverse spin Hall effect.
+Non-intuitively, we find the spin diffusion length is reduced by the magnetic
+gradient. This is understood by invoking the idea of co-current and
+counter-current exchange which is a concept frequently invoked in fields as
+disparate as animal physiology and thermal engineering.",2307.16838v1
+2024-03-11,Impact of spin torques and spin pumping phenomena on magnon-plasmon polaritons in antiferromagnetic insulator-semiconductor heterostructures,"We investigate the impact of spin torque and spin pumping on the surface
+magnon polariton dispersion in a antiferromagnetic insulator-semiconductor
+heterostructure. In the bilayer system, the surface magnon polaritons
+conventionally couple to the plasma-oscillations in the semiconductor via
+electromagnetic fields. Additionally, magnons in the antiferromagnetic
+insulator layer may interact with the semiconductor layer via spin torques and
+their reciprocal phenomena of spin pumping. Due to the spin-to-charge
+conversion from the spin Hall and inverse spin Hall effects in the
+semiconductor layer with a strong spin-orbit coupling, this can couple the
+magnons to the plasmons in the semiconductor layer. Our research reveals that
+modifications in the mode frequency and the hybridization gap induced by these
+phenomena depend on the thickness of the antiferromagnetic layer. In thick
+layers, the spin-pumping contribution to the frequency shift and damping is
+inversely proportional to the wavelength, while in thin layers it is inversely
+proportional to the thickness. Furthermore, hybridization of the surface magnon
+polariton and dispersive magnons in the antiferromagnet is shown to depend on
+both the thickness and wavelength of the modes.",2403.06934v1
+2017-04-25,Unified Treatment of Spin Torques using a Coupled Magnetisation Dynamics and Three-Dimensional Spin Current Solver,"A three-dimensional spin current solver based on a generalised spin
+drift-diffusion description, including the spin Hall effect, is integrated with
+a magnetisation dynamics solver. The resulting model is shown to simultaneously
+reproduce the spin-orbit torques generated using the spin Hall effect, spin
+pumping torques generated by magnetisation dynamics in multilayers, as well as
+the spin transfer torques acting on magnetisation regions with spatial
+gradients, whilst field-like and spin-like torques are reproduced in a spin
+valve geometry. Two approaches to modelling interfaces are analysed, one based
+on the spin mixing conductance and the other based on continuity of spin
+currents where the spin dephasing length governs the absorption of transverse
+spin components. In both cases analytical formulas are derived for the
+spin-orbit torques in a heavy metal / ferromagnet bilayer geometry, showing in
+general both field-like and damping-like torques are generated. The limitations
+of the analytical approach are discussed, showing that even in a simple bilayer
+geometry, due to the non-uniformity of the spin currents, a full
+three-dimensional treatment is required. Finally the model is applied to the
+quantitative analysis of the spin Hall angle in Pt by reproducing published
+experimental data on the ferromagnetic resonance linewidth in the bilayer
+geometry.",1704.07758v2
+2012-11-16,Spin thermoelectrics in a disordered Fermi gas,"We study the connection between the spin-heat and spin-charge response in a
+disordered Fermi gas with spin-orbit coupling. It is shown that the ratio
+between the above responses can be expressed as the thermopower $S=-(\pi
+k_B)^2T\sigma'/3e\sigma$ times a number $R_s$ which depends on the strength and
+type of the spin-orbit couplings considered. The general results are
+illustrated by examining different two-dimensional electron or hole systems
+with different and competing spin-orbit mechanisms, and we conclude that a
+metallic system could prove much more efficient as a heat-to-spin than as a
+heat-to-charge converter.",1211.3839v2
+2009-12-06,Resonant all-electric spin pumping with spin-orbit coupling,"All-electric devices for the generation and filtering of spin currents are of
+crucial importance for spintronics experiments and applications. Here we
+consider a quantum dot between two metallic leads in the presence of spin-orbit
+coupling, and we analyze in the frame of a scattering matrix approach the
+conditions for generating spin currents in an adiabatically driven two-terminal
+device. We then focus on a dot with two resonant orbitals and show by specific
+examples that both spin filtering and pure spin current generation can be
+achieved. Finally, we discuss the effect of the Coulomb interaction.",0912.1096v2
+2020-02-26,Spin-orbit-phonon interaction as an origin of helical-symmetry breaking spin-triplet superconducting state,"The excess increase of the local field distribution width $\Delta
+H\equiv\sigma/\gamma_{\mu}$ (with $\gamma_{\mu}=135.5\,$MHz/T being the
+gyromagnetic ratio of $\mu^{+}$), and/or the spontaneous magnetic field $H_{\rm
+spon}$, have been reported in the superconducting state of a series of
+compounds more than 10 by $\mu$SR (muon spin rotation or relaxation)
+experiment. Sizes of these quantities are of the order of 1G on the whole. We
+propose that the increase of the local field distribution $\Delta H$ in those
+compounds, including ions with strong spin-orbit interaction of 5d electrons,
+such as La in LaNiGa$_2$ or Re in Re$_6$Zr, is possible through the cooperation
+of the spin-orbit coupling between the quasiparticles and ionic vibrations
+(phonons) and the conventional quasiparticles-phonon coupling, inducing the
+spin-triplet p-wave pairing with helical symmetry breaking superconducting
+state with chiral super spin current around stopped $\mu^{+}$ site. The size of
+$\Delta H$ is estimated as of the order of 1G, in consistent with experimental
+observations.",2002.11344v1
+2019-08-23,Momentum-Dependent Spin Splitting by Collinear Antiferromagnetic Ordering,"We clarify the macroscopic symmetry and microscopic model-parameter
+conditions for emergence of spin-split electronic band structure in collinear
+antiferromagnets without atomic spin-orbit coupling. By using the microscopic
+multipole descriptions, we elucidate the fundamental degree of freedom in a
+cluster unit of an antiferromagnet giving rise to an effective spin-orbit
+interaction through the anisotropic kinetic motions of electrons. We show a
+correspondence of the ordering patterns and resultant momentum-dependent spin
+splitting for 32 crystallographic point groups after demonstrating two
+intuitive examples of four-sublattice pyrochlore and tetragonal systems. Our
+study unveils potential features of collinear antiferromagnets with
+considerably weak spin-orbit coupling in light-element materials and 3$d$
+transition metal oxides, which can be utilized for a spin-current generation by
+electric (thermal) current and a magneto-striction effect.",1908.08680v1
+2002-08-13,Electron Spin Dynamics in Semiconductors without Inversion Symmetry,"We present a microscopic analysis of electron spin dynamics in the presence
+of an external magnetic field for non-centrosymmetric semiconductors in which
+the D'yakonov-Perel' spin-orbit interaction is the dominant spin relaxation
+mechanism. We implement a fully microscopic two-step calculation, in which the
+relaxation of orbital motion due to electron-bath coupling is the first step
+and spin relaxation due to spin-orbit coupling is the second step. On this
+basis, we derive a set of Bloch equations for spin with the relaxation times
+T_1 and T_2 obtained microscopically. We show that in bulk semiconductors
+without magnetic field, T_1 = T_2, whereas for a quantum well with a magnetic
+field applied along the growth direction T_1 = T_2/2 for any magnetic field
+strength.",0208261v1
+2007-04-24,Spin-charge filtering through a spin-orbit coupled quantum dot controlled via an Aharonov-Bohm interferometer,"We show that a strongly correlated quantum dot embedded in an Aharonov-Bohm
+interferometer can be used to filter both charge and spin at zero voltage bias.
+The magnitude with which the Aharonov-Bohm arm is coupled to the system
+controls the many-body effects on the quantum dot. When the quantum dot is in
+the Kondo regime the flow of charge through the system can be tuned by the
+phase of the Aharonov-Bohm arm, $\phi_{AB}$. Furthermore when a spin-orbit
+interaction is present on a Kondo quantum dot we can control the flow of spin
+by the spin-orbit phase, $\phi_{SO}$. The existence of the Kondo peak at the
+Fermi energy makes it possible to control the flow of both charge and spin in
+the zero voltage bias limit.",0704.3212v3
+2012-09-07,Chiral Spin Waves in Fermi Liquids with Spin-Orbit Coupling,"We predict the existence of chiral spin waves collective modes in a
+two-dimensional Fermi liquid with the Rashba or Dresselhaus spin-orbit
+coupling. Starting from the phenomenological Landau theory, we show that the
+long-wavelength dynamics of magnetization is governed by the Klein- Gordon
+equations. The standing-wave solutions of these equations describe ""particles""
+with effective masses, whose magnitudes and signs depend on the strength of the
+electron-electron interaction. The spectrum of the spin-chiral modes for
+arbitrary wavelengths is determined from the Dyson equation for the interaction
+vertex. We propose to observe spin-chiral modes via microwave absorption of
+standing waves confined by an in-plane profile of the spin-orbit splitting.",1209.1647v1
+2014-12-18,Intrinsic Spin Torque Without Spin-Orbit Coupling,"We derive an intrinsic contribution to the non-adiabatic spin torque for
+non-uniform magnetic textures. It differs from previously considered
+contributions in several ways and can be the dominant contribution in some
+models. It does not depend on the change in occupation of the electron states
+due to the current flow but rather is due to the perturbation of the electronic
+states when an electric field is applied. Therefore it should be viewed as
+electric-field-induced rather than current-induced. Unlike previously reported
+non-adiabatic spin torques, it does not originate from extrinsic relaxation
+mechanisms nor spin-orbit coupling. This intrinsic non-adiabatic spin torque is
+related by a chiral connection to the intrinsic spin-orbit torque that has been
+calculated from the Berry phase for Rashba systems.",1412.6123v2
+2016-11-09,The $3d$-Electron Heisenberg Pyrochlore Mn$_2$Sb$_2$O$_7$,"In frustrated magnetic systems, geometric constraints or the competition
+amongst interactions introduce extremely high degeneracy and prevent the system
+from readily selecting a low-temperature ground state. The most frustrated
+known spin arrangement is on the pyrochlore lattice, but nearly all magnetic
+pyrochlores have unquenched orbital angular momentum, constraining the spin
+directions through spin-orbit coupling. Pyrochlore Mn$_2$Sb$_2$O$_7$ is an
+extremely rare Heisenberg pyrochlore system, with directionally-unconstrained
+spins and low chemical disorder. We show that it undergoes a spin-glass
+transition at 5.5K, which is suppressed by disorder arising from Mn vacancies,
+indicating this ground state to be a direct consequence of the spins'
+interactions. The striking similarities to $3d$ transition metal pyrochlores
+with unquenched angular momentum suggests that the low spin-orbit coupling in
+the $3d$ block makes Heisenberg pyrochlores far more accessible than previously
+imagined.",1611.02811v1
+2011-11-29,Anomalous Hall effect in superconductors with spin-orbit interaction,"We calculate the anomalous Hall conductance of superconductors with
+spin-orbit interaction and with either uniform or local magnetization. In the
+first case we consider a uniform ferromagnetic ordering in a spin triplet
+superconductor, while in the second case we consider a conventional s-wave spin
+singlet superconductor with a magnetic impurity (or a diluted set of magnetic
+impurities). In the latter case we show that the anomalous Hall conductance can
+be used to track the quantum phase transition, that occurs when the spin
+coupling between the impurity and electronic spin density exceeds a certain
+critical value. In both cases we find that for large spin-orbit coupling the
+superconductivity is destroyed and the Hall conductance oscillates strongly.",1111.6748v1
+2014-06-03,Spin-orbital dynamics in a system of polar molecules,"Spin-orbit coupling (SOC) in solids normally originates from the electron
+motion in the electric field of the crystal. It is key to understanding a
+variety of spin-transport and topological phenomena, such as Majorana fermions
+and recently discovered topological insulators. Implementing and controlling
+spin-orbit coupling is thus highly desirable and could open untapped
+opportunities for the exploration of unique quantum physics. Here, we show that
+dipole-dipole interactions can produce an effective SOC in two-dimensional
+ultracold polar molecule gases. This SOC generates chiral excitations with a
+non-trivial Berry phase $2\pi$. These excitations, which we call
+\emph{chirons}, resemble low-energy quasiparticles in bilayer graphene and
+emerge regardless of the quantum statistics and for arbitrary ratios of kinetic
+to interaction energies. Chirons manifest themselves in the dynamics of the
+spin density profile, spin currents, and spin coherences, even for molecules
+pinned in a deep optical lattice and should be observable in current
+experiments.",1406.0570v2
+2015-12-14,Nonlocal Anomalous Hall Effect,"The anomalous Hall effect is deemed to be a unique transport property of
+ferromagnetic metals, caused by the concerted action of spin polarization and
+spin-orbit coupling. Nevertheless, recent experiments have shown that the
+effect also occurs in a nonmagnetic metal (Pt) in contact with a magnetic
+insulator (yttrium iron garnet (YIG)), even when precautions are taken to
+ensure there is no induced magnetization in the metal. We propose a theory of
+this effect based on the combined action of spin-dependent scattering from the
+magnetic interface and the spin Hall effect in the bulk of the metal. At
+variance with previous theories, we predict the effect to be of first order in
+the spin-orbit coupling, just as the conventional anomalous Hall effect -- the
+only difference being the spatial separation of the spin orbit interaction and
+the magnetization. For this reason we name this effect \textit{nonlocal
+anomalous Hall effect} and predict that its sign will be determined by the sign
+of the spin Hall angle in the metal. The AH conductivity that we calculate from
+our theory is in good agreement with the measured values in Pt/YIG structures.",1512.04146v1
+2020-05-18,Mechanically modulated spin orbit couplings in oligopeptides,"Recently experiments have shown very significant spin activity in biological
+molecules such as DNA, proteins, oligopeptides and aminoacids. Such molecules
+have in common their chiral structure, time reversal symmetry and the absence
+of magnetic exchange interactions. The spin activity is then assumed to be due
+to either the pure Spin-orbit (SO) interaction or SO coupled to the presence of
+strong local sources of electric fields. Here we derive an analytical
+tight-binding Hamiltonian model for Oligopeptides that contemplates both
+intrinsic SO and Rashba interaction induced by hydrogen bond. We use a lowest
+order perturbation theory band folding scheme and derive the reciprocal space
+intrinsic and Rashba type Hamiltonian terms to evaluate the spin activity of
+the oligopeptide and its dependence of molecule uniaxial deformations. SO
+strengths in the tens of meV are found and explicit spin active deformation
+potentials. We find a rich interplay between responses to deformations both to
+enhance and diminish SO strength that allow for experimental testing of the
+orbital model. Qualitative consistency with recent experiments shows the role
+of hydrogen bonding in spin activity.",2005.08474v1
+2024-02-19,Photoelectron Polarization Vortexes in Strong-Field Ionization,"The spin polarization of photoelectrons induced by an intense linearly
+polarized laser field is investigated using numerical solutions of the
+time-dependent Schr\""odinger equation in companion with our analytic treatment
+via the spin-resolved strong-field approximation and classical trajectory Monte
+Carlo simulations. We demonstrate that, even though the total polarization
+vanishes upon averaging over the photoelectron momentum, momentum-resolved spin
+polarization is significant, typically exhibiting a vortex structure relative
+to the laser polarization axis. The polarization arises from the transfer of
+spin-orbital coupling in the bound state to the spin-correlated quantum orbits
+in the continuum. The rescattering of photoelectrons at the atomic core plays
+an important role in forming the polarization vortex structure, while there is
+no significant effect of the spin-orbit coupling during the continuum dynamics.
+Furthermore, spin-polarized electron holography is demonstrated, feasible for
+extracting fine structural information about the atom.",2402.11825v1
+2006-05-08,"Spin-orbit effects in GaAs quantum wells: Interplay between Rashba, Dresselhaus, and Zeeman interactions","The interplay between Rashba, Dresselhaus and Zeeman interactions in a
+quantum well submitted to an external magnetic field is studied by means of an
+accurate analytical solution of the Hamiltonian, including electron-electron
+interactions in a sum rule approach. This solution allows to discuss the
+influence of the spin-orbit coupling on some relevant quantities that have been
+measured in inelastic light scattering and electron-spin resonance experiments
+on quantum wells. In particular, we have evaluated the spin-orbit contribution
+to the spin splitting of the Landau levels and to the splitting of charge- and
+spin-density excitations. We also discuss how the spin-orbit effects change if
+the applied magnetic field is tilted with respect to the direction
+perpendicular to the quantum well.",0605199v1
+2014-09-30,Current-induced spin torque resonance of magnetic insulators affected by field-like spin-orbit torques and out-of-plane magnetizations,"The spin-torque ferromagnetic resonance (ST-FMR) in a bilayer system
+consisting of a magnetic insulator such as Y3Fe5O12 and a normal metal with
+spin-orbit interaction such as Pt is addressed theoretically. We model the
+ST-FMR for all magnetization directions and in the presence of field-like
+spin-orbit torques based on the drift-diffusion spin model and quantum
+mechanical boundary conditions. ST-FMR experiments may expose crucial
+information about the spin-orbit coupling between currents and magnetization in
+the bilayers.",1409.8406v2
+2015-11-03,The role of spin-orbit interaction in the ultrafast demagnetization of small iron clusters,"The ultra-fast demagnetization of small iron clusters initiated by an intense
+optical excitation is studied with time-dependent spin density functional
+theory (TDSDFT). In particular we investigate the effect of the spin-orbit
+interaction on the onset of the demagnetization process. It is found that the
+initial rate of coherent spin loss is proportional to the square of the atomic
+spin-orbit coupling constant, $\lambda$. A simplified quantum spin model
+comprising spin-orbit interaction and a local time-dependent magnetic field is
+found to be the minimal model able to reproduce our {\it ab initio} results.
+The model predicts the $\lambda^2$ dependence of the onset rate of
+demagnetization when it is solved either numerically or analytically in the
+linear response limit. Our findings are supported by additional TDSDFT
+simulations of clusters made of Co and Ni.",1511.00864v1
+2021-11-09,Dynamics of hole singlet triplet qubits with large g-factor differences,"The spin-orbit interaction is the key element for electrically tunable spin
+qubits. Here we probe the effect of cubic Rashba spin-orbit interaction on
+mixing of the spin states by investigating singlet-triplet oscillations in a
+planar Ge hole double quantum dot. By varying the magnetic field direction we
+find an intriguing transformation of the funnel into a butterfly-shaped
+pattern. Landau-Zener sweeps disentangle the Zeeman mixing effect from the
+spin-orbit induced coupling and show that large singlet-triplet avoided
+crossings do not imply a strong spin-orbit interaction. Our work emphasizes the
+need for a complete knowledge of the energy landscape when working with hole
+spin qubits.",2111.05130v1
+2018-04-26,Orbital quantum magnetism in spin dynamics of strongly interacting magnetic lanthanide atoms,"Laser cooled lanthanide atoms are ideal candidates with which to study strong
+and unconventional quantum magnetism with exotic phases. Here, we use
+state-of-the-art closed-coupling simulations to model quantum magnetism for
+pairs of ultracold spin-6 erbium lanthanide atoms placed in a deep optical
+lattice. In contrast to the widely used single-channel Hubbard model
+description of atoms and molecules in an optical lattice, we focus on the
+single-site multi-channel spin evolution due to spin-dependent contact,
+anisotropic van der Waals, and dipolar forces. This has allowed us to identify
+the leading mechanism, orbital anisotropy, that governs molecular spin dynamics
+among erbium atoms. The large magnetic moment and combined orbital angular
+momentum of the 4f-shell electrons are responsible for these strong anisotropic
+interactions and unconventional quantum magnetism. Multi-channel simulations of
+magnetic Cr atoms under similar trapping conditions show that their
+spin-evolution is controlled by spin-dependent contact interactions that are
+distinct in nature from the orbital anisotropy in Er. The role of an external
+magnetic field and the aspect ratio of the lattice site on spin dynamics is
+also investigated.",1804.10102v1
+2013-11-29,Gate Tunable In- and Out-Of-Plane Spin-Orbit Coupling and Spin Splitting Anisotropy at LaAlO3/SrTiO3 (110) Interface,"Manipulating spin-orbit coupling (SOC) is important for devices such as
+spin-orbit torque based memory and its understanding is neccessary to answer
+several fundamental open questions in triplet state superconductivity,
+topological insulators and Majorana fermions. Here we report spin splitting of
+25 meV at the LaAlO3/SrTiO3 (110) interface for in-plane spins at a current
+density of 1.4x104 A/cm2, which is large compared to that found in
+semiconductor heterostructures or the LaAlO3/SrTiO3 (100) interface, and in
+addition it is anisotropic. The anisotropy arises from the difference in
+electron effective mass along the [001] and [1-10] directions. Our study
+predicts a spin splitting energy > 1000 meV at a current density of 107 A/cm2,
+which is enormous compared to metallic systems and will be an ideal spin
+polarized source. In addition to the in-plane effect, there is an unexpected
+gate-tunable out-of-plane SOC at the LaAlO3/SrTiO3 (110) interface when the
+spins lie out-of-plane due to broken symmetry in the plane of the interface. We
+demonstrate that this can be manipulated by varying the LaAlO3 thickness
+showing that this interface can be engineered for spin-orbit torque devices.",1311.7532v3
+2014-08-31,Effect of the spin-orbit interaction on flows in heavy-ion collisions at intermediate energies,"The effect of the spin-orbit coupling in heavy ion collisions is investigated
+based on an updated version of the ultra-relativistic quantum molecular
+dynamics (UrQMD) model, in which the Skyrme potential energy density functional
+is employed. And in special, the spin-orbit coupling effects on the directed
+and elliptic flows of free nucleons emitted from $^{197}$Au+$^{197}$Au
+collisions as functions of both the beam energy and the impact parameter are
+studied. Our results show that the net contribution of the spin-orbit term to
+flows of nucleons is negligible, whereas a directed flow splitting between
+spin-up and spin-down nucleons is visible especially at large impact parameters
+and a peak of the splitting is found at the beam energy around 150
+MeV$/$nucleon. We also found that the directed flow splitting between spin-up
+and spin-down neutrons is comparable with the neutron directed flow difference
+calculated by a soft and a stiff symmetry energy, indicating that the directed
+flow of neutrons cannot be used to pin down the stiffness of symmetry energy
+any more without considering the spin degree of freedom in models in case of
+spin polarization.",1409.0188v1
+2023-07-10,Spin transport properties of spinel vanadate-based heterostructures,"Spin-orbit coupling and breaking of inversion symmetry are necessary
+ingredients to enable a pure spin current-based manipulation of the
+magnetization via the spin-orbit torque effect. Currently, magnetic insulator
+oxides with non-dissipative characteristics are being explored. When combined
+with non-magnetic heavy metals, known for their large spin-orbit coupling, they
+offer promising potential for energy-efficient spin-orbitronics applications.
+The intrinsic electronic correlations characterizing those strongly correlated
+oxides hold the promises to add extra control-knobs to the desired efficient
+spin-wave propagation and abrupt magnetization switching phenomena. Spinel
+vanadate FeV2O4 (FVO) exhibits several structural phase transitions which are
+accompanied by an intricate interplay of magnetic, charge and orbital
+orderings. When grown as a thin film onto SrTiO3, the compressive strain state
+induces a perpendicular magnetic anisotropy, making FVO-based heterostructures
+desirable for spin-orbitronics applications. In this study, we have optimised
+the deposition of stoichiometric and epitaxial Pt/FVO heterostructures by
+Pulsed Laser Deposition and examined their spin-related phenomena. From
+angle-dependent magnetotransport measurements, we observed both Anisotropic
+Magnetoresistance (AMR) and Spin Hall Magnetoresistance (SMR) effects. Our
+findings show the SMR component as the primary contributor to the overall
+magnetoresistance, whose high value of 0.12% is only comparable to properly
+optimized oxide-based systems.",2307.04389v1
+2014-06-16,Early Excitation of Spin-Orbit Misalignments in Close-in Planetary Systems,"Continued observational characterization of transiting planets that reside in
+close proximity to their host stars has shown that a substantial fraction of
+such objects posses orbits that are inclined with respect to the spin axes of
+their stars. Mounting evidence for the wide-spread nature of this phenomenon
+has challenged the conventional notion that large-scale orbital transport
+occurs during the early epochs of planet formation and is accomplished via
+planet-disk interactions. However, recent work has shown that the excitation of
+spin-orbit misalignment between protoplanetary nebulae and their host stars can
+naturally arise from gravitational perturbations in multi-stellar systems as
+well as magnetic disk-star coupling. In this work, we examine these processes
+in tandem. We begin with a thorough exploration of the
+gravitationally-facilitated acquisition of spin-orbit misalignment and
+analytically show that the entire possible range of misalignments can be
+trivially reproduced. Moreover, we demonstrate that the observable spin-orbit
+misalignment only depends on the primordial disk-binary orbit inclination.
+Subsequently, we augment our treatment by accounting for magnetic torques and
+show that more exotic dynamical evolution is possible, provided favorable
+conditions for magnetic tilting. Cumulatively, our results suggest that
+observed spin-orbit misalignments are fully consistent with disk-driven
+migration as a dominant mechanism for the origin of close-in planets.",1406.4183v1
+2019-10-01,Complete reversal of the atomic unquenched orbital moment by a single electron,"The orbital angular moment of magnetic atoms adsorbed on surfaces is often
+quenched as a result of an anisotropic crystal field. Due to spin-orbit
+coupling, what remains of the orbital moment typically delineates the
+orientation of the electron spin. These two effects limit the scope of
+information processing based on these atoms to essentially only one magnetic
+degree of freedom: the spin. In this work, we gain independent access to both
+the spin and orbital degrees of freedom of a single atom, inciting and probing
+excitations of each moment. By coordinating a single Fe atom atop the nitrogen
+site of the Cu$_2$N lattice, we realize a single-atom system with a large
+zero-field splitting--the largest reported for Fe atoms on surfaces--and an
+unquenched uniaxial orbital moment that closely approaches the free-atom value.
+We demonstrate a full reversal of the orbital moment through a single-electron
+tunneling event between the tip and Fe atom, a process that is mediated by a
+charged virtual state and leaves the spin unchanged. These results, which we
+corroborate using density functional theory and first-principles multiplet
+calculations, demonstrate independent control over the spin and orbital degrees
+of freedom in a single-atom system.",1910.00325v2
+1996-06-10,Surprises in the Orbital Magnetic Moment and g-Factor of the Dynamic Jahn-Teller Ion C_{60}^-,"We calculate the magnetic susceptibility and g-factor of the isolated
+C_{60}^- ion at zero temperature, with a proper treatment of the dynamical
+Jahn-Teller effect, and of the associated orbital angular momentum, Ham-reduced
+gyromagnetic ratio, and molecular spin-orbit coupling. A number of surprises
+emerge. First, the predicted molecular spin-orbit splitting is two orders of
+magnitude smaller than in the bare carbon atom, due to the large radius of
+curvature of the molecule. Second, this reduced spin-orbit splitting is
+comparable to Zeeman energies, for instance, in X-band EPR at 3.39KGauss, and a
+field dependence of the g-factor is predicted. Third, the orbital gyromagnetic
+factor is strongly reduced by vibron coupling, and so therefore are the
+effective weak-field g-factors of all low-lying states. In particular, the
+ground-state doublet of C_{60}^- is predicted to show a negative g-factor of
+\sim -0.1.",9606059v1
+2014-07-03,A Poor Man's Derivation of Quantum Compass-Heisenberg Interaction: Superexchange Interaction in J-J Coupling Scheme,"The exchange interaction between 5d electrons in t$_{2g}$ orbitals is derived
+in the J-J coupling scheme which is the appropriate basis in the case of strong
+spin-orbit interaction. From simple calculations, it is found that
+ferromagnetic Ising interaction (quantum compass model) occurs due to a
+selection rule of hybridization between $\Gamma_7$ and $\Gamma_8$ orbitals,
+while antiferromagnetic Heisenberg interaction appears from hybridization
+between $\Gamma_7$ orbitals. It is also found that the ferromagnetic Ising
+interaction becomes small as the spin-orbit interaction increases. Thus, the
+sign of exchange interaction changes from ferromagnetic Ising to
+antiferromagnetic Heisenberg interaction as the spin-orbit interaction
+increases.",1407.0811v1
+2014-05-19,Strain and Spin-Orbit Coupling Induced Orbital-Ordering in Mott Insulator BaCrO3,"Using ab initio calculations, we have investigated an insulating tetragonally
+distorted perovskite BaCrO$_3$ with a formal $3d^2$ configuration, the volume
+of which is apparently substantially enhanced by a strain due to SrTiO$_3$
+substrate. Inclusion of both correlation and spin-orbit coupling (SOC) effects
+leads to a metal-insulator transition and in-plane zigzag orbital-ordering (OO)
+of alternating singly filled $d_{xz}+id_{yz}$ and $d_{xz}-id_{yz}$ orbitals,
+which results in a large orbital moment $M_L$ ~ -0.78 $\mu_B$ antialigned to
+the spin moment $M_S$ ~ $2|M_L|$ in Cr ions. Remarkably, this ordering also
+induces a considerable $M_L$ for apical oxygens. Our findings show
+metal-insulator and OO transitions, driven by an interplay among strain,
+correlation, and SOC, which is uncommon in 3d systems.",1405.4593v2
+2019-11-05,"Internal magnetic fields, spin-orbit coupling, and orbital period modulation in close binary systems","We introduce a new model to explain the modulation of the orbital period
+observed in close stellar binary systems based on an angular momentum exchange
+between the spin of the active component and the orbital motion. This
+spin-orbit coupling is not due to tides, but is produced by a non-axisymmetric
+component of the gravitational quadrupole moment of the active star due to a
+persistent non-axisymmetric internal magnetic field. The proposed mechanism
+easily satisfies all the energy constraints having an energy budget about
+100-1000 times smaller than those of previously proposed models and is
+supported by the observations of persistent active longitudes in the active
+components of close binary systems. We present preliminary applications to
+three well-studied binary systems to illustrate the model. The case of stars
+with hot Jupiters is also discussed showing that no significant orbital period
+modulation is generally expected on the basis of the proposed model.",1911.01757v3
+2021-02-19,Local Observations of Orbital Diamagnetism and Excitation in Three-Dimensional Dirac Fermion Systems Bi$_{1-x}$Sb$_x$,"Dirac fermions display a singular response against magnetic and electric
+fields. A distinct manifestation is large diamagnetism originating in the
+interband effect of Bloch bands, as observed in bismuth alloys. Through
+$^{209}$Bi NMR spectroscopy, we extract diamagnetic orbital susceptibility
+inherent to Dirac fermions in the semiconducting bismuth alloys
+Bi$_{1-x}$Sb$_x$ ($x = 0.08 - 0.16$). The $^{209}$Bi hyperfine coupling
+constant provides an estimate of the effective orbital radius. In addition to
+the interband diamagnetism, Knight shift includes an anomalous
+temperature-independent term originating in the enhanced intraband diamagnetism
+under strong spin-orbit coupling. The nuclear spin-lattice relaxation rate
+$1/T_1$ is dominated by orbital excitation and follows cubic temperature
+dependence in the extensive temperature range. The result demonstrates the
+robust diamagnetism and low-lying orbital excitation against the small gap
+opening, whereas $x$-dependent spin excitation appears at low temperatures.",2102.09917v1
+2005-10-13,Theory of successive transitions in vanadium spinels and order of orbitals and spins,"We have theoretically studied successive transitions in vanadium spinel
+oxides with (t_2g)^2 electron configuration. These compounds show a structural
+transition at ~ 50K and an antiferromagnetic transition at ~ 40K. Since
+threefold t_2g orbitals of vanadium cations are occupied partially and
+vanadiums constitute a geometrically-frustrated pyrochlore lattice, the system
+provides a particular example to investigate the interplay among spin, orbital
+and lattice degrees of freedom on frustrated lattice. We examine the models
+with the Jahn-Teller coupling and/or the spin-orbital superexchange
+interaction, and conclude that keen competition between these two contributions
+explains the thermodynamics of vanadium spinels. Effects of quantum
+fluctuations as well as relativistic spin-orbit coupling are also discussed.",0510331v1
+2013-04-08,Origin of the insulating state in honeycomb iridates and rhodates,"A burning question in the emerging field of spin-orbit driven insulating
+iridates, such as Na2IrO3 and Li2IrO3 is whether the observed insulating state
+should be classified as a Mott-Hubbard insulator derived from a half-filled
+relativistic j_eff=1/2 band or as a band insulator where the gap is assisted by
+spin-orbit interaction, or Coulomb correlations, or both. The difference
+between these two interpretations is that only for the former, strong
+spin-orbit coupling (lambda >~ W, where W is the band width) is essential. We
+have synthesized the isostructural and isoelectronic Li2RhO3 and report its
+electrical resistivity and magnetic susceptibility. Remarkably it shows
+insulating behavior together with fluctuating effective S=1/2 moments, similar
+to Na2IrO3 and Li2IrO3, although in Rh4+ (4d5) the spin-orbit coupling is
+greatly reduced. We show that this behavior has non-relativistic one-electron
+origin (although Coulomb correlations assist in opening the gap), and can be
+traced down to formation of quasi-molecular orbitals, similar to those in
+Na2IrO3.",1304.2258v3
+2015-03-04,Gate induced enhancement of spin-orbit coupling in dilute fluorinated graphene,"We analyze the origin of spin-orbit coupling (SOC) in fluorinated graphene
+using Density Functional Theory (DFT) and a tight-binding model for the
+relevant orbitals. As it turns out, the dominant source of SOC is the atomic
+spin-orbit of fluorine adatoms and not the impurity induced SOC based on the
+distortion of the graphene plane as in hydrogenated graphene. More
+interestingly, our DFT calculations show that SOC is strongly affected by both
+the type and concentrations of the graphene's carriers, being enhanced by
+electron doping and reduced by hole doping. This effect is due to the charge
+transfer to the fluorine adatom and the consequent change in the
+fluorine-carbon bonding. Our simple tight-binding model, that includes the SOC
+of the $2p$ orbitals of F and effective parameters based on maximally localized
+Wannier functions, is able to account for the effect. The strong enhancement of
+the SOC induced by graphene doping opens the possibility to tune the spin
+relaxation in this material.",1503.01395v1
+2015-06-24,Origin of the Spin-Orbit Interaction,"We consider a semi-classical model to describe the origin of the spin-orbit
+interaction in a simple system such as the hydrogen atom. The interaction
+energy U is calculated in the rest-frame of the nucleus, around which an
+electron, having linear velocity v and magnetic dipole-moment mu, travels in a
+circular orbit. The interaction energy U is due to the coupling of the induced
+electric dipole p=(v/c)x mu with the electric field En of the nucleus. Assuming
+the radius of the electron's orbit remains constant during a spin-flip
+transition, our model predicts that the energy of the system changes by Delta_E
+= U/2, the factor 1/2 emerging naturally as a consequence of equilibrium and
+the change of the kinetic energy of the electron. The correct 1/2 factor for
+the spin-orbit coupling energy is thus derived without the need to invoke the
+well-known Thomas precession in the rest-frame of the electron.",1506.07239v1
+2017-06-26,Optically and electrically controllable adatom spin-orbital dynamics in transition metal dichalcogenides,"We analyze the interplay of spin-valley coupling, orbital physics and
+magnetic anisotropy taking place at single magnetic atoms adsorbed on
+semiconducting transition-metal dichalcogenides, MX$_2$ (M = Mo, W; X = S, Se).
+Orbital selection rules turn out to govern the kinetic exchange coupling
+between the adatom and charge carriers in the MX$_2$ and lead to highly
+orbitally dependent spin-flip scattering rates, as we illustrate for the
+example of transition metal adatoms with $d^9$ configuration. Our ab initio
+calculations suggest that $d^9$ configurations are realizable by single Co, Rh,
+or Ir adatoms on MoS$_2$, which additionally exhibit a sizable magnetic
+anisotropy. We find that the interaction of the adatom with carriers in the
+MX$_2$ allows to tune its behavior from a quantum regime with full Kondo
+screening to a regime of ""Ising spintronics"" where its spin-orbital moment acts
+as classical bit, which can be erased and written electronically and optically.",1706.08365v1
+2020-08-08,Orbital tunable 0-$π$ transitions in Josephson junctions with noncentrosymmetric topological superconductors,"We investigate the Josephson transport properties in a Josephson junction
+consisting of a conventional $s$-wave superconductor coupled to a multi-orbital
+noncentrosymmetric superconductor marked by an orbitally driven inversion
+asymmetry and isotropic interorbital spin-triplet pairing. Contrary to the
+canonical single band noncentrosymmetric superconductor, we demonstrate that
+the local interorbital spin-triplet pairing is tied to the occurrence of
+sign-changing spin-singlet pair amplitude on different bands with $d$-wave
+symmetry. Such multi-band $d^{\pm}$-wave state is a unique superconducting
+configuration that drives unexpected Josephson effects with 0-$\pi$ transitions
+displaying a high degree of electronic control. Remarkably, we find that the
+phase state of a noncentrosymmetric/$s$-wave Josephson junction can be toggled
+between 0 and $\pi$ in multiple ways through a variation of electron filling,
+strength of the spin-orbital coupling, amplitude of the inversion asymmetry
+interaction, and junction transparency. These results highlight an intrinsic
+orbital and electrical tunability of the Josephson response and provide unique
+paths to unveil the nature of unconventional multiorbital superconductivity as
+well as inspire innovative designs of Josephson quantum devices.",2008.03482v2
+2022-04-06,Influence of spin-orbit coupling on chemical bonding,"The influence of spin-orbit interaction on chemical bonds in elemental solids
+and homonuclear dimers is analyzed by means of density-functional-theory
+calculations. Employing highly precise all-electron full-potential methodology,
+our results represent benchmark quality. Comparison of the scalar- and
+fully-relativistic approaches for elemental solids shows that the spin-orbit
+interaction may contract or expand the volume of the considered material. The
+largest variation of the volume is obtained for Au, Tl, I, Bi, Po and Hg,
+exhibiting changes between 1.0--7.6\%. Using the tight-binding model, we show
+for diatomic molecules that the nature of this effect lies in the angular
+rearrangement of bonding and antibonding orbitals introduced by spin-orbit
+coupling. Such an angular rearrangement appears in partially filled $p$- or
+$d$-orbitals in heavy elements. Finally, we discuss the impact of the
+relativistic effects on the chemical bonding in single-layer iodides and
+transition metal dichalcogenides",2204.02751v1
+2011-11-14,Importance of including small body spin effects in the modelling of intermediate mass-ratio inspirals. II Accurate parameter extraction of strong sources using higher-order spin effects,"We improve the numerical kludge waveform model introduced in [1] in two ways.
+We extend the equations of motion for spinning black hole binaries derived by
+Saijo et al. [2] using spin-orbit and spin-spin couplings taken from
+perturbative and post-Newtonian (PN) calculations at the highest order
+available. We also include first-order conservative self-force corrections for
+spin-orbit and spin-spin couplings, which are derived by comparison to PN
+results. We generate the inspiral evolution using fluxes that include the most
+recent calculations of small body spin corrections, spin-spin and spin-orbit
+couplings and higher-order fits to solutions of the Teukolsky equation. Using a
+simplified version of this model in [1], we found that small body spin effects
+could be measured through gravitational wave observations from
+intermediate-mass ratio inspirals (IMRIs) with mass ratio eta ~ 0.001, when
+both binary components are rapidly rotating. In this paper we study in detail
+how the spin of the small/big body affects parameter measurement using a
+variety of mass and spin combinations for typical IMRIs sources. We find that
+for IMRI events of a moderately rotating intermediate mass black hole (IMBH) of
+ten thousand solar masses, and a rapidly rotating central supermassive black
+hole (SMBH) of one million solar masses, gravitational wave observations made
+with LISA at a fixed signal-to-noise ratio (SNR) of 1000 will be able to
+determine the inspiralling IMBH mass, the central SMBH mass, the SMBH spin
+magnitude, and the IMBH spin magnitude to within fractional errors of ~0.001,
+0.001, 0.0001, and 9%, respectively. LISA can also determine the location of
+the source in the sky and the SMBH spin orientation to within ~0.0001
+steradians. We show that by including conservative corrections up to 2.5PN
+order, systematic errors no longer dominate over statistical errors for IMRIs
+with typical SNR ~1000.",1111.3243v3
+2021-06-01,Spin Hall and inverse spin galvanic effects in graphene with strong interfacial spin-orbit coupling: a quasi-classical Green's function approach,"van der Waals heterostructures assembled from atomically thin crystals are
+ideal model systems to study spin-orbital coupled transport because they
+exhibit a strong interplay between spin, lattice and valley degrees of freedom
+that can be manipulated by strain, electric bias and proximity effects. The
+recently predicted spin-helical regime in graphene on transition metal
+dichalcogenides, in which spin and pseudospin degrees of freedom are locked
+together [M. Offidani et al. Phys. Rev. Lett. 119, 196801 (2017)], suggests
+their potential application in spintronics. Here, by deriving an Eilenberger
+equation for the quasiclassical Green's function of two-dimensional Dirac
+fermions in the presence of} spin-orbit coupling\textcolor{black}{{} (SOC) and
+scalar disorder, we obtain analytical expressions for the dc spin galvanic
+susceptibility and spin Hall conductivity in the spin-helical regime. Our
+results disclose a sign change in the spin Hall angle (SHA) when the Fermi
+energy relative to the Dirac point matches the Bychkov-Rashba energy scale,
+irrespective of the magnitude of the spin-valley interaction imprinted on the
+graphene layer. The behavior of the SHA is connected to a reversal of the total
+internal angular momentum of Bloch electrons that reflects the spin-pseudospin
+entanglement induced by SOC. We also show that the charge-spin conversion
+reaches a maximum when the Fermi level lies at the edge of the spin-minority
+band in agreement with previous findings. Both features are fingerprints of
+spin-helical Dirac fermions and suggest a direct way to estimate the strength
+of proximity-induced SOC from transport data. The relevance of these findings
+for interpreting recent spin-charge conversion measurements in nonlocal
+spin-valve geometry is also discussed.",2106.00624v1
+2023-04-29,Natural orbitals and two-particle correlators as tools for analysis of effective exchange couplings in solids,"Using generalizations of natural orbitals, spin-averaged natural orbitals,
+and two-particle charge correlators for solids, we investigate electronic
+structure of antiferromagnetic transition-metal oxides with a fully
+self-consistent, finite-temperature GW method. Our findings disagree with
+Goodenough-Kanamori (GK) rules, commonly used for qualitative interpretation of
+such solids. First, we found a strong dependence of natural orbital occupancies
+on momenta contradicting GK assumptions. Second, along the momentum path, the
+character of natural orbitals changes. In particular, contributions of oxygen
+2s orbitals are important, which has not been considered in the GK rules. To
+analyze the influence of electronic correlation on the values of effective
+exchange coupling constants, we use both natural orbitals and two-particle
+correlators and show that electronic screening modulates the degree of
+superexchange by stabilizing the charge-transfer contributions, greatly
+affecting these coupling constants. Finally, we give a set of predictions and
+recommendations regarding the use of density functional, Green's function, and
+wave-function methods for evaluating effective magnetic couplings in molecules
+and solids.",2305.00325v1
+2020-04-15,Interfacial-hybridization-modified Ir Ferromagnetism and Electronic Structure in LaMnO$_3$/SrIrO$_3$ Superlattices,"Artificially fabricated 3$d$/5$d$ superlattices (SLs) involve both strong
+electron correlation and spin-orbit coupling in one material by means of
+interfacial 3$d$-5$d$ coupling, whose mechanism remains mostly unexplored. In
+this work we investigated the mechanism of interfacial coupling in
+LaMnO$_3$/SrIrO$_3$ SLs by several spectroscopic approaches. Hard x-ray
+absorption, magnetic circular dichroism and photoemission spectra evidence the
+systematic change of the Ir ferromagnetism and the electronic structure with
+the change of the SL repetition period. First-principles calculations further
+reveal the mechanism of the SL-period dependence of the interfacial electronic
+structure and the local properties of the Ir moments, confirming that the
+formation of Ir-Mn molecular orbital is responsible for the interfacial
+coupling effects. The SL-period dependence of the ratio between spin and
+orbital components of the Ir magnetic moments can be attributed to the
+realignment of electron spin during the formation of the interfacial molecular
+orbital. Our results clarify the nature of interfacial coupling in this
+prototypical 3$d$/5$d$ SL system and the conclusion will shed light on the
+study of other strongly correlated and spin-orbit coupled oxide
+hetero-interfaces.",2004.06864v1
+2015-04-21,Valley coupling in finite-length metallic single-wall carbon nanotubes,"Degeneracy of discrete energy levels of finite-length, metallic single-wall
+carbon nanotubes depends on type of nanotubes, boundary condition, length of
+nanotubes and spin-orbit interaction. Metal-1 nanotubes, in which two
+non-equivalent valleys in the Brillouin zone have different orbital angular
+momenta with respect to the tube axis, exhibits nearly fourfold degeneracy and
+small lift of the degeneracy by the spin-orbit interaction reflecting the
+decoupling of two valleys in the eigenfunctions. In metal-2 nanotubes, in which
+the two valleys have the same orbital angular momentum, vernier-scale-like
+spectra appear for boundaries of orthogonal-shaped edge or cap-termination
+reflecting the strong valley coupling and the asymmetric velocities of the
+Dirac states. Lift of the fourfold degeneracy by parity splitting overcomes the
+spin-orbit interaction in shorter nanotubes with a so-called minimal boundary.
+Slowly decaying evanescent modes appear in the energy gap induced by the
+curvature of nanotube surface. Effective one-dimensional model reveals the role
+of boundary on the valley coupling in the eigenfunctions.",1504.05337v1
+2016-05-27,Functional renormalization group study of orbital fluctuation mediated superconductivity: Impact of the electron-boson coupling vertex corrections,"In various multiorbital systems, the emergence of the orbital fluctuations
+and its role on the pairing mechanism attract increasing attention. To archive
+deep understanding on these issues, we perform the
+functional-renormalization-group (fRG) study for the two-orbital Hubbard model.
+The vertex corrections for the electron-boson coupling ($U$-VC), which are
+dropped in the Migdal-Eliashberg gap equation, are obtained by solving the RG
+equation. We reveal that the dressed electron-boson coupling for the
+charge-channel, $U_{eff}^c$, becomes much larger than the bare Coulomb
+interaction, $U^0$, due to the $U$-VC in the presence of moderate spin
+fluctuations. For this reason, the attractive pairing interaction due to the
+charge or orbital fluctuations is enlarged by the factor $(U_{eff}^c/U^0)^2 >>
+1$. In contrast, the spin fluctuation pairing interaction is suppressed by the
+spin-channel $U$-VC, because of the relation $U_{eff}^s << U^0$. The present
+study demonstrates that the orbital or charge fluctuation pairing mechanism can
+be realized in various multiorbital systems thanks to the $U$-VC, such as in
+Fe-based superconductors.",1605.08728v2
+2020-01-23,Effect of Spin-Orbit Coupling on Decay Widths of Electronic Decay Processes,"Auger-Meitner processes are electronic decay processes of energetically
+low-lying vacancies. In these processes, the vacancy is filled by an electron
+of an energetically higher lying orbital, while another electron is
+simultaneously emitted to the continuum. In low-lying orbitals relativistic
+effects can not even be neglected for light elements. At the same time lifetime
+calculations are computationally expensive. In this context, we investigate
+which effect spin-orbit coupling has on Auger-Meitner decay widths and aim for
+a rule of thumb for the relative decay widths of initial states split by
+spin-orbit coupling. We base this rule of thumb on Auger-Meitner decay widths
+of Sr4$p^{-1}$ and Ra6$p^{-1}$ obtained by relativistic FanoADC-Stieltjes
+calculations.",2001.08441v2
+2022-03-25,Spin-orbit coupling and crystal-field splitting in Ti-doped Ca2RuO4 studied by ellipsometry,"In Ca2RuO4, the competition of spin-orbit coupling $\zeta$ and tetragonal
+crystal field splitting $\Delta_{CF}$ has been discussed controversially for
+many years. The orbital occupation depends on $\Delta_{CF}/\zeta$, which allows
+us to address this ratio via the optical spectral weights of the lowest
+intersite Mott-Hubbard excitations. We study the optical conductivity of
+Ca$_2$Ru$_{0.99}$Ti$_{0.01}$O$_4$ in the range of 0.75 - 5 eV by ellipsometry,
+using the large single crystals that can be grown for small Ti concentrations.
+Based on a local multiplet calculation, our analysis results in $2.4 \leq
+\Delta_{CF}/\zeta \leq 4$ at 15 K. The dominant crystal field yields a ground
+state close to xy orbital order but spin-orbit coupling is essential for a
+quantitative description of the properties. Furthermore, we observe a
+pronounced decrease of $\Delta_{CF}$ with increasing temperature, as expected
+based on the reduction of octahedral distortions.",2203.13651v1
+2021-07-09,Effect of Rashba spin-orbit and Rabi couplings on the excitation spectrum of binary Bose-Einstein condensates,"We present the collective excitation spectrum analysis of binary
+Bose-Einstein condensates (BECs) with spin-orbit (SO) and Rabi couplings in a
+quasi-two-dimensional system. In particular, we investigate the role of SO and
+Rabi coupling strengths in determining the dynamical stability of the coupled
+BECs using Bogoliubov-de Gennes (BdG) theory. Using the eigenergy of BdG
+spectrum, we confirm the existence of phonon, roton, and maxon modes with weak
+repulsive intra- and inter-species contact interactions. The depth of the
+minimum corresponding to the roton mode depends strongly on the coupling
+strength. We find that the increase of the SO coupling leads to instability,
+while the increase in the Rabi coupling stabilizes the system. Also the
+eigenvectors of BdG spectrum indicates the presence of density like mode in the
+stable regime and spin like modes in unstable regimes. A phase diagram
+demonstrating the stability regime in the plane of SO and Rabi coupling
+strengths is obtained. Finally, we complement the observation of the excitation
+spectrum with the direct numerical simulation results of coupled
+Gross-Pitaevskii equations.",2107.04237v1
+2013-06-15,The spin Hall effect in a quantum gas,"Electronic properties like current flow are generally independent of the
+electron's spin angular momentum, an internal degree of freedom present in
+quantum particles. The spin Hall effects (SHEs), first proposed 40 years ago,
+are an unusual class of phenomena where flowing particles experience
+orthogonally directed spin-dependent Lorentz-like forces, analogous to the
+conventional Lorentz force for the Hall effect, but opposite in sign for two
+spin states. Such spin Hall effects have been observed for electrons flowing in
+spin-orbit coupled materials such as GaAs or InGaAs and for laser light
+traversing dielectric junctions. Here we observe the spin Hall effect in a
+quantum-degenerate Bose gas, and use the resulting spin-dependent Lorentz
+forces to realize a cold-atom spin transistor. By engineering a spatially
+inhomogeneous spin-orbit coupling field for our quantum gas, we explicitly
+introduce and measure the requisite spin-dependent Lorentz forces, in excellent
+agreement with our calculations. This atomtronic circuit element behaves as a
+new type of velocity-insensitive adiabatic spin-selector, with potential
+application in devices such as magnetic or inertial sensors. In addition, such
+techniques --- for both creating and measuring the SHE --- are clear
+prerequisites for engineering topological insulators and detecting their
+associated quantized spin Hall effects in quantum gases. As implemented, our
+system realized a laser-actuated analog to the Datta-Das spin transistor.",1306.3579v2
+2013-12-26,Bulk topological insulators as inborn spintronics detectors,"Detection and manipulation of electrons' spins are key prerequisites for
+spin-based electronics or spintronics. This is usually achieved by contacting
+ferromagnets with metals or semiconductors, in which the relaxation of spins
+due to spin-orbit coupling limits both the efficiency and the length scale. In
+topological insulator materials, on the contrary, the spin-orbit coupling is so
+strong that the spin direction uniquely determines the current direction, which
+allows us to conceive a whole new scheme for spin detection and manipulation.
+Nevertheless, even the most basic process, the spin injection into a
+topological insulator from a ferromagnet, has not yet been demonstrated. Here
+we report successful spin injection into the surface states of topological
+insulators by using a spin pumping technique. By measuring the voltage that
+shows up across the samples as a result of spin pumping, we demonstrate that a
+spin-electricity conversion effect takes place in the surface states of
+bulk-insulating topological insulators Bi1.5Sb0.5Te1.7Se1.3 and Sn-doped
+Bi2Te2Se. In this process, due to the two-dimensional nature of the surface
+state, there is no spin current along the perpendicular direction. Hence, the
+mechanism of this phenomenon is different from the inverse spin Hall effect and
+even predicts perfect conversion between spin and electricity at room
+temperature. The present results reveal a great advantage of topological
+insulators as inborn spintronics devices.",1312.7091v1
+2016-04-07,Spin diffusion in p-type bilayer WSe$_2$,"We investigate the steady-state out-of-plane spin diffusion in p-type bilayer
+WSe2 in the presence of the Rashba spin-orbit coupling and Hartree-Fock
+effective magnetic field. The out-of-plane components of the Rashba spin-orbit
+coupling serve as the opposite Zeeman-like fields in the two valleys. Together
+with the identical Hartree-Fock effective magnetic fields, different total
+effective magnetic field strengths in the two valleys are obtained. It is
+further revealed that due to the valley-dependent total effective magnetic
+field strength, similar (different) spin-diffusion lengths in the two valleys
+are observed at small (large) spin injection. Nevertheless, it is shown that
+the intervalley hole-phonon scattering can suppress the difference in the
+spin-diffusion lengths at large spin injection due to the spin-conserving
+intervalley charge transfers with the opposite transfer directions between
+spin-up and -down holes. Moreover, with a fixed large pure spin injection, we
+predict the build-up of a steady-state valley polarization during the spin
+diffusion with the maximum along the diffusion direction being capable of
+exceeding 1 %. It is revealed that the valley polarization arises from the
+induced quasi hot-hole Fermi distributions with different effective hot-hole
+temperatures between spin-up and -down holes during the spin diffusion, leading
+to the different intervalley charge transfer rates in the opposite transfer
+directions. Additionally, it is also shown that by increasing the injected spin
+polarization, the hole density or the impurity density, the larger valley
+polarization can be obtained.",1604.01892v2
+2017-01-21,Stationary states and screening equations in the spin-Hall effect,"The characterization of the stationary states in the spin-Hall effect is
+discussed within the framework of the phenomenological two spin-channel model.
+It is shown that two different definitions of the stationary states can be
+applied in the spin-Hall effect, leading to two different types of state in the
+bulk: zero transverse spin-current or non-zero pure spin-current. This
+difference is due to the treatment of the region near the edges, in which
+electric charge accumulation occurs. The screening equations that describe the
+accumulation of electric charges due to spin-orbit coupling are derived. The
+spin-accumulation associated to spin-flip scattering and the spin-Hall
+accumulation due to spin-orbit coupling are two independent effects if we
+assume that the screening length is small with respect to the spin-diffusion
+length. The corresponding transport equations are discussed in terms of the
+Dyakonov-Perel equations.",1701.06017v3
+2009-01-27,What can we learn about the dynamics of transported spins by measuring shot noise in spin-orbit-coupled nanostructures?,"We review recent studies of the shot noise of spin-polarized charge currents
+and pure spin currents in multiterminal semiconductor nanostructures, while
+focusing on the effects brought by the intrinsic Rashba spin-orbit (SO)
+coupling and/or extrinsic SO scattering off impurities in two-dimensional
+electron gas (2DEG) based devices. By generalizing the scattering theory of
+quantum shot noise to include the full spin-density matrix of electrons
+injected from a spin-filtering electrode, we show how decoherence and dephasing
+in the course of spin precession can lead to substantial enhancement of the
+Fano factor (noise-to-current ratio) of spin-polarized charge currents. In
+four-terminal SO-coupled nanostructures, injection of unpolarized charge
+current through the longitudinal leads is responsible not only for the pure
+spin Hall current in the transverse leads, but also for nonequilibrium random
+time-dependent current fluctuations. The analysis of the shot noise of
+transverse pure spin Hall current and zero charge current, or transverse spin
+current and non-zero charge Hall current, driven by unpolarized or
+spin-polarized injected longitudinal charge current, respectively, reveals a
+unique experimental tool to differentiate between the intrinsic Rashba and
+extrinsic SO mechanisms underlying the spin Hall effect in 2DEG devices.
+Finally, we discuss the shot noise of transverse spin and zero charge currents
+in the quantum-interference-driven spin Hall effect in ballistic four-terminal
+Aharonov-Casher rings realized using high-mobility 2DEG with the Rashba SO
+coupling.",0901.4182v2
+2020-10-07,Orbital isotropy of magnetic fluctuations in correlated electron materials induced by Hund's exchange coupling,"Characterizing non-local magnetic fluctuations in materials with strong
+electronic Coulomb interactions remains one of the major outstanding challenges
+of modern condensed matter theory. In this work we address the spatial symmetry
+and orbital structure of magnetic fluctuations in perovskite materials. To this
+aim, we develop a consistent multi-orbital diagrammatic extension of dynamical
+mean field theory, which we apply to an anisotropic three-orbital model of
+cubic $t_{2g}$ symmetry. We find that the form of spatial spin fluctuations is
+governed by the local Hund's coupling. For small values of the coupling,
+magnetic fluctuations are anisotropic in orbital space, which reflects the
+symmetry of the considered $t_{2g}$ model. Large Hund's coupling enhances
+collective spin excitations, which mixes orbital and spatial degrees of
+freedom, and magnetic fluctuations become orbitally isotropic. Remarkably, this
+effect can be seen only in two-particle quantities; single-particle observables
+remain anisotropic for any value of the Hund's coupling. Importantly, we find
+that the orbital isotropy can be induced both, at half-filling and for the case
+of $4$ electrons per lattice site, where the magnetic instability is associated
+with different, antiferromagnetic and ferromagnetic modes, respectively.",2010.03433v4
+2007-03-22,Orbital contribution to the magnetic properties of iron as a function of dimensionality,"The orbital contribution to the magnetic properties of Fe in systems of
+decreasing dimensionality (bulk, surfaces, wire and free clusters) is
+investigated using a tight-binding hamiltonian in an $s, p,$ and $d$ atomic
+orbital basis set including spin-orbit coupling and intra-atomic electronic
+interactions in the full Hartree-Fock (HF) scheme, i.e., involving all the
+matrix elements of the Coulomb interaction with their exact orbital dependence.
+Spin and orbital magnetic moments and the magnetocrystalline anisotropy energy
+(MAE) are calculated for several orientations of the magnetization. The results
+are systematically compared with those of simplified hamiltonians which give
+results close to those obtained from the local spin density approximation. The
+full HF decoupling leads to much larger orbital moments and MAE which can reach
+values as large as 1$\mu_B$ and several tens of meV, respectively, in the
+monatomic wire at the equilibrium distance. The reliability of the results
+obtained by adding the so-called Orbital Polarization Ansatz (OPA) to the
+simplified hamiltonians is also discussed. It is found that when the spin
+magnetization is saturated the OPA results for the orbital moment are in
+qualitative agreement with those of the full HF model. However there are large
+discrepancies for the MAE, especially in clusters. Thus the full HF scheme must
+be used to investigate the orbital magnetism and MAE of low dimensional
+systems.",0703576v1
+2003-11-13,Theory of Spin-Charge Coupled Transport in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interactions,"We use microscopic linear response theory to derive a set of equations that
+provide a complete description of coupled spin and charge diffusive transport
+in a two-dimensional electron gas (2DEG) with the Rashba spin-orbit (SO)
+interaction. These equations capture a number of interrelated effects including
+spin accumulation and diffusion, Dyakonov-Perel spin relaxation,
+magnetoelectric, and spin-galvanic effects. They can be used under very general
+circumstances to model transport experiments in 2DEG systems that involve
+either electrical or optical spin injection. We comment on the relationship
+between these equations and the exact spin and charge density operator
+equations of motion. As an example of the application of our equations, we
+consider a simple electrical spin injection experiment and show that a voltage
+will develop between two ferromagnetic contacts if a spin-polarized current is
+injected into a 2DEG, that depends on the relative magnetization orientation of
+the contacts. This voltage is present even when the separation between the
+contacts is larger than the spin diffusion length.",0311328v3
+2020-01-02,Noncollinear Spintronics and Electric-Field Control: A Review,"Our world is composed of various materials with different structures, where
+spin structures have been playing a pivotal role in spintronic devices of the
+contemporary information technology. Apart from conventional collinear spin
+materials such as collinear ferromagnets and collinear antiferromagnetically
+coupled materials, noncollinear spintronic materials have emerged as hot spots
+of research attention owing to exotic physical phenomena. In this Review, we
+firstly introduce two types noncollinear spin structures, i.e., the chiral spin
+structure that yields real-space Berry phases and the coplanar noncollinear
+spin structure that could generate momentum-space Berry phases, and then move
+to relevant novel physical phenomena including topological Hall effect,
+anomalous Hall effect, multiferroic, Weyl fermions, spin-polarized current, and
+spin Hall effect without spin-orbit coupling in these noncollinear spin
+systems. Afterwards, we summarize and elaborate the electric-field control of
+the noncollinear spin structure and related physical effects, which could
+enable ultralow power spintronic devices in future. In the final outlook part,
+we emphasize the importance and possible routes for experimentally detecting
+the intriguing theoretically predicted spin-polarized current, verifying the
+spin Hall effect in the absence of spin-orbit coupling and exploring the
+anisotropic magnetoresistance and domain-wall-related magnetoresistance effects
+for noncollinear antiferromagnetic materials.",2001.00321v1
+2020-10-26,Spin Insulatronics,"Spin insulatronics covers efforts to generate, detect, control, and utilize
+high-fidelity pure spin currents and excitations inside magnetic insulators.
+Ultimately, the new findings may open doors for pure spin-based information and
+communication technologies. The aim is to replace moving charges with dynamical
+entities that utilize low-dissipation coherent and incoherent spin excitations
+in antiferromagnetic and ferromagnetic insulators. The ambition is that the new
+pure spin-based system will suffer reduced energy losses and operate at high
+frequencies. In magnetic insulators, there are no mobile charge carriers that
+can dissipate energy. Integration with conventional electronics is possible via
+interface exchange interactions and spin-orbit couplings. In this way, the free
+electrons in the metals couple to the localized spins in the magnetic
+insulators. In turn, these links facilitate spin-transfer torques and
+spin-orbit torques across metal-insulator interfaces and the associated
+phenomena of spin-pumping and charge-pumping. The interface couplings also
+connect the electron motion inside the metals with the spin fluctuations inside
+the magnetic insulators. These features imply that the system can enable
+unprecedented control of correlations resulting from the electron-magnon
+interactions. We review recent developments to realize electric and thermal
+generation, manipulation, detection, and control of pure spin information in
+insulators.",2010.13512v1
+2018-07-24,Microscopic Theory of Spin Relaxation Anisotropy in Graphene with Proximity-Induced Spin-Orbit Coupling,"Inducing sizable spin--orbit interactions in graphene by proximity effect is
+establishing as a successful route to harnessing two-dimensional Dirac fermions
+for spintronics. Semiconducting transition metal dichalcogenides (TMDs) are an
+ideal complement to graphene because of their strong intrinsic spin--orbit
+coupling (SOC) and spin/valley-selective light absorption, which allows
+all-optical spin injection into graphene. In this study, we present a
+microscopic theory of spin dynamics in weakly disordered graphene samples
+subject to uniform proximity-induced SOC as realized in graphene/TMD bilayers.
+A time-dependent perturbative treatment is employed to derive spin Bloch
+equations governing the spin dynamics at high electronic density. Various
+scenarios are predicted, depending on a delicate competition between
+interface-induced Bychkov-Rashba and spin--valley (Zeeman-type) interactions
+and the ratio of intra- to inter-valley scattering rates. For weak SOC compared
+to the disorder-induced quasiparticle broadening, the anisotropy ratio of
+out-of-plane to in-plane spin lifetimes
+$\zeta=\tau_{s}^{\perp}/\tau_{s}^{\parallel}$ agrees qualitatively with a toy
+model of spins in a weak fluctuating SOC field recently proposed by Cummings
+and co-workers [PRL 119, 206601 (2017)]. In the opposite regime of
+well-resolved SOC, qualitatively different formulae are obtained, which can be
+tested in ultra-clean heterostructures characterized by uniform
+proximity-induced SOC in the graphene layer.",1807.09275v1
+2020-08-11,Impact of $\mathcal{T}$-symmetry on spin decoherence and control in a synthetic spin-orbit field,"The electrical control of a spin qubit in a quantum dot relies on spin-orbit
+coupling (SOC), which could be either intrinsic to the underlying crystal
+lattice or heterostructure, or extrinsic via, for example, a micro-magnet. Here
+we show that a key difference between the intrinsic SOC and the synthetic SOC
+introduced by a micro-magnet is their symmetry under time reversal.
+Specifically, the time-reversal symmetry ($\mathcal{T}$-symmetry) of the
+intrinsic SOC leads to not only the traditional van Vleck cancellation known
+for spin relaxation, but also vanishing spin dephasing to the lowest order of
+SOC, which we term as ""longitudinal spin-orbit field cancellation"". On the
+other hand, the synthetic SOC from a micro-magnet breaks the
+$\mathcal{T}$-symmetry, therefore eliminates both the ""van Vleck cancellation""
+and the ""longitudinal spin-orbit field cancellation"". In other words, the
+effective field $\vec\Omega$ experienced by the spin qubit does not depend on
+the quantization magnetic field anymore, and a longitudinal component is
+allowed for $\vec\Omega$ to the first order of SOC. Consequently, spin
+relaxation and dephasing are qualitatively modified compared with the case of
+the intrinsic SOC. Furthermore, the fidelity of electric-dipole spin resonance
+based on $\vec\Omega$ could be optimized, with potential applications in
+spin-based quantum computing.",2008.04671v2
+2020-05-11,Photoinduced electronic and spin properties of two-dimensional electron gases with Rashba spin-orbit coupling under perpendicular magnetic fields,"We theoretically investigate photoinduced phenomena induced by time-periodic
+driving fields in two-dimensional electron gases under perpendicular magnetic
+fields with Rashba spin-orbit coupling. Using perturbation theory, we provide
+analytical results for the Floquet-Landau energy spectrum appearing due to THz
+radiation. By employing the resulting photo-modulated states, we compute the
+dynamical evolution of the spin polarization function for an initially prepared
+coherent state. We find that the interplay of the magnetic field, Rashba
+spin-orbit interaction and THz radiation can lead to inversion of the spin
+polarization. The dynamics also induces fractional revivals and non-trivial
+beating patterns in the autocorrelation function due to interference of the
+photo-modulated quantum states. We also calculate the transverse photo-assisted
+conductivity in the linear response regime using Kubo formalism and analyze the
+impact of the radiation field and Rashba spin-orbit interaction. In the static
+limit, we find that our results reduce to well-known expressions of the
+conductivity in non-relativistic and quasi-relativistic (topological insulator
+surfaces) two-dimensional electron gas thoroughly described in the literature.
+We discuss the possible experimental detection of our theoretical prediction
+and their relevance for spin-orbit physics at high magnetic fields.",2005.05450v2
+2021-10-18,Momentum-Space Spin Antivortex and Spin Transport in Monolayer Pb,"Non-trivial momentum-space spin texture of electrons can be induced by
+spin-orbit coupling and underpins various spin transport phenomena, such as
+current-induced spin polarization and spin Hall effect. In this work, we find a
+non-trivial spin texture, spin anti-vortex, can appear at certain momenta on
+the $\Gamma-\text K$ line in 2D monolayer Pb on top of SiC. Different from spin
+vortex due to the band degeneracy in the Rashba model, the existence of this
+spin anti-vortex is guaranteed by Poincare-Hopf theorem and thus topologically
+stable. Accompanied with this spin anti-vortex, a Lifshtiz transition of Fermi
+surfaces occur at certain momenta on the $\text K- \text M$ line, and both
+phenomena are originated from the anti-crossing between the $j=1/2$ and $j=3/2$
+bands. A rapid variation of the response coefficients for both the
+current-induced spin polarization and spin Hall conductivity is found when the
+Fermi energy is tuned around the spin anti-vortex. Our work demonstrates the
+monolayer Pb as a potentially appealing platform for spintronic applications.",2110.08968v2
+2015-12-10,Robust Zero Energy Bound States Localized at Magnetic Impurities in Iron-based Superconductors,"We investigate the effect of spin-orbit coupling on the in-gap bound states
+localized at magnetic impurities in multi-band superconductors with
+unconventional (sign-changed) and conventional (sign-unchanged) $s$-wave
+pairing symmetry, which may be relevant to iron-based superconductors. Without
+spin-orbit coupling, for spin-singlet superconductors it is known that such
+bound states cross zero energy at a critical value of the impurity scattering
+strength and acquire a finite spin-polarization. Moreover, the degenerate,
+spin-polarized, zero energy bound states are unstable to applied Zeeman fields
+as well as deviation of the impurity scattering strength away from criticality.
+Using a T-matrix formalism as well as analytical arguments, we show that, in
+the presence of spin-orbit coupling, the zero-energy bound states localized at
+magnetic impurities in unconventional, sign-changed, $s$-wave superconductors
+acquire surprising robustness to applied Zeeman fields and variation in the
+impurity scattering strength, an effect which is absent in the conventional,
+sign-unchanged, $s$-wave superconductors. Given that the iron-based multi-band
+superconductors may possess a substantial spin-orbit coupling as seen in recent
+experiments, our results may provide one possible explanation to the recent
+observation of surprisingly robust zero bias scanning tunneling microscope
+peaks localized at magnetic impurities in iron-based superconductors provided
+the order parameter symmetry is sign changing $s_{+-}$-wave.",1512.03450v2
+2021-07-09,Magnetoelectric torque and edge currents caused by spin-orbit coupling,"Using a tight-biding model, we elaborate that the previously discovered
+out-of-plane polarized helical edge spin current caused by Rashba spin-orbit
+coupling can be attributed to the fact that in a strip geometry, a positive
+momentum eigenstate does not always have the same spin polarization at the edge
+as the corresponding negative momentum eigenstate. In addition, in the presence
+of a magnetization pointing perpendicular to the edge, an edge charge current
+is produced, which can be chiral or nonchiral depending on whether the
+magnetization lies in-plane or out-of-plane. The spin polarization near the
+edge develops a transverse component orthogonal to the magnetization, which is
+antisymmetric between the two edges and tends to cause a noncollinear magnetic
+order between the two edges. If the magnetization only occupies a region near
+one edge, or in an irregular shaped quantum dot, this transverse component has
+a nonzero average, rendering a gate voltage-induced magnetoelectric torque
+without the need of a bias voltage. We also argue that other types of
+spin-orbit coupling that can be obtained from the Rashba type through a unitary
+transformation, such as the Dresselhaus spin-orbit coupling, will have similar
+effects too.",2107.04665v2
+2023-10-26,Perfect crossed Andreev reflection in the proximitized graphene/superconductor/proximitized graphene junctions,"We study the crossed Andreev reflection and the nonlocal transport in the
+proximitized graphene/supercondcutor/proximitized graphene junctions with the
+pseudospin staggered potential and the intrinsic spin-orbit coupling. The
+crossed Andreev reflection with the local Andreev reflection and the elastic
+cotunneling being completely eliminated can be realized for the electrons with
+the specific spin-valley index when the intrinsic spin-orbit couplings in the
+left graphene and the right graphene possess the opposite sign. The perfect
+crossed Andreev reflection with its probability equal to $100\%$ can be
+obtained in the space consisting of the incident angle and the energy of the
+electrons. The crossed conductance and its oscillation with the superconductor
+length are also investigated. The energy ranges for the crossed Andreev
+reflection without the local Andreev reflection and the elastic cotunneling are
+clarified for the different magnitudes of the pseudospin potential and the
+spin-orbit coupling. The spin-valley index of the electrons responsible for the
+perfect crossed Andreev reflection can be switched by changing the sign of the
+intrinsic spin-orbit coupling or exchanging the biases applied on the left
+graphene and the right graphene. Our results are helpful for designing the
+flexible and high-efficiency Cooper pair splitter based on the spin-valley
+degree of freedom.",2310.17301v1
+2005-02-09,Post-Newtonian gravitational radiation and equations of motion via direct integration of the relaxed Einstein equations. III. Radiation reaction for binary systems with spinning bodies,"Using post-Newtonian equations of motion for fluid bodies that include
+radiation-reaction terms at 2.5 and 3.5 post-Newtonian (PN) order (O[(v/c)^5]
+and O[(v/c)^7] beyond Newtonian order), we derive the equations of motion for
+binary systems with spinning bodies. In particular we determine the effects of
+radiation-reaction coupled to spin-orbit effects on the two-body equations of
+motion, and on the evolution of the spins. For a suitable definition of spin,
+we reproduce the standard equations of motion and spin-precession at the first
+post-Newtonian order. At 3.5PN order, we determine the spin-orbit induced
+reaction effects on the orbital motion, but we find that radiation damping has
+no effect on either the magnitude or the direction of the spins. Using the
+equations of motion, we find that the loss of total energy and total angular
+momentum induced by spin-orbit effects precisely balances the radiative flux of
+those quantities calculated by Kidder et al. The equations of motion may be
+useful for evolving inspiraling orbits of compact spinning binaries.",0502039v2
+2016-06-15,Quantum Computing with Acceptor Spins in Silicon,"The states of a boron acceptor near a Si/SiO2 interface, which bind two
+low-energy Kramers pairs, have exceptional properties for encoding quantum
+information and, with the aid of strain, both heavy hole and light hole-based
+spin qubits can be designed. Whereas a light-hole spin qubit was introduced
+recently [Phys. Rev. Lett. 116, 246801 (2016)], here we present analytical and
+numerical results proving that a heavy-hole spin qubit can be reliably
+initialised, rotated and entangled by electrical means alone. This is due to
+strong Rashba-like spin-orbit interaction terms enabled by the interface
+inversion asymmetry. Single qubit rotations rely on electric-dipole spin
+resonance (EDSR), which is strongly enhanced by interface-induced spin-orbit
+terms. Entanglement can be accomplished by Coulomb exchange, coupling to a
+resonator, or spin-orbit induced dipole-dipole interactions. By analysing the
+qubit sensitivity to charge noise, we demonstrate that interface-induced
+spin-orbit terms are responsible for sweet spots in the dephasing time T2* as a
+function of the top gate electric field, which are close to maxima in the EDSR
+strength, where the EDSR gate has high fidelity. We show that both qubits can
+be described using the same starting Hamiltonian, and by comparing their
+properties we show that the complex interplay of bulk and interface-induced
+spin-orbit terms allows a high degree of electrical control and makes acceptors
+potential candidates for scalable quantum computation in Si.",1606.04697v1
+2003-08-29,Landau Expansion for the Kugel-Khomskii $t_{2g}$ Hamiltonian,"The Kugel-Khomskii (KK) Hamiltonian for the titanates describes spin and
+orbital superexchange interactions between $d^1$ ions in an ideal perovskite
+structure in which the three $t_{2g}$ orbitals are degenerate in energy and
+electron hopping is constrained by cubic site symmetry. In this paper we
+implement a variational approach to mean-field theory in which each site, $i$,
+has its own $n \times n$ single-site density matrix $\rhov(i)$, where $n$, the
+number of allowed single-particle states, is 6 (3 orbital times 2 spin states).
+The variational free energy from this 35 parameter density matrix is shown to
+exhibit the unusual symmetries noted previously which lead to a
+wavevector-dependent susceptibility for spins in $\alpha$ orbitals which is
+dispersionless in the $q_\alpha$-direction. Thus, for the cubic KK model
+itself, mean-field theory does not provide wavevector `selection', in agreement
+with rigorous symmetry arguments. We consider the effect of including various
+perturbations. When spin-orbit interactions are introduced, the susceptibility
+has dispersion in all directions in ${\bf q}$-space, but the resulting
+antiferromagnetic mean-field state is degenerate with respect to global
+rotation of the staggered spin, implying that the spin-wave spectrum is
+gapless. This possibly surprising conclusion is also consistent with rigorous
+symmetry arguments. When next-nearest-neighbor hopping is included, staggered
+moments of all orbitals appear, but the sum of these moments is zero, yielding
+an exotic state with long-range order without long-range spin order. The effect
+of a Hund's rule coupling of sufficient strength is to produce a state with
+orbital order.",0308608v1
+1997-10-31,Non-precessional spin-orbit effects on gravitational waves from inspiraling compact binaries to second post-Newtonian order,"We derive all second post-Newtonian (2PN), non-precessional effects of spin-
+orbit coupling on the gravitational wave forms emitted by an inspiraling binary
+composed of spinning, compact bodies in a quasicircular orbit. Previous post-
+Newtonian calculations of spin-orbit effects (at 1.5PN order) relied on a fluid
+description of the spinning bodies. We simplify the calculations by introducing
+into post-Newtonian theory a delta-function description of the influence of the
+spins on the bodies' energy-momentum tensor. This description was recently used
+by Mino, Shibata, and Tanaka (MST) in Teukolsky-formalism analyses of particles
+orbiting massive black holes, and is based on prior work by Dixon. We compute
+the 2PN contributions to the wave forms by combining the MST energy-momentum
+tensor with the formalism of Blanchet, Damour, and Iyer for evaluating the
+binary's radiative multipoles, and with the well-known 1.5PN order equations of
+motion for the binary. Our results contribute at 2PN order only to the
+amplitudes of the wave forms. The secular evolution of the wave forms' phase,
+the quantity most accurately measurable by LIGO, is not affected by our results
+until 2.5PN order, at which point other spin-orbit effects also come into play.
+We plan to evaluate the entire 2.5PN spin-orbit contribution to the secular
+phase evolution in a future paper, using the techniques of this paper.",9710134v1
+2018-08-19,Emergent quantum criticality from spin-orbital entanglement in $d^8$ Mott insulators: the case of a diamond lattice antiferromagnet,"Motivated by the recent activities on the Ni-based diamond lattice
+antiferromagnet NiRh$_2$O$_4$, we theoretically explore on a general ground the
+unique spin and orbital physics for the Ni$^{2+}$ ions with a $3d^8$ electron
+configuration in the tetrahedral crystal field environment and on a diamond
+lattice Mott insulator. The superexchange interaction between the local moments
+usually favors magnetic orders. Due to the particular electron configuration of
+the Ni$^{2+}$ ion with a partially filled upper $t_{2g}$ level and a fully
+filled lower $e_g$ level, the atomic spin-orbit coupling becomes active at the
+linear order and would favor a spin-orbital-entangled singlet with quenched
+local moments in the single-ion limit. Thus, the spin-orbital entanglement
+competes with the superexchange and could drive the system to a quantum
+critical point that separates the spin-orbital singlet and the magnetic order.
+We further explore the effects of magnetic field and uniaxial pressure. The
+non-trivial response to the magnetic field is intimately tied to the underlying
+spin-orbital structure of the local moments. We discuss the future experiments
+such as doping and pressure, and point out the correspondence between different
+electron configurations.",1808.06154v1
+2023-09-16,Exploring orbital-charge conversion mediated by interfaces with copper through spin-orbital pumping,"We investigated how different materials affect the orbital-charge conversion
+in heterostructures with the naturally oxidized cooper capping layer. When we
+added a thin layer of $CuOx(3nm)$ onto yttrium iron garnet $(YIG)/W$ stacks, we
+observed a significant reduction in the charge current signal measured by means
+the spin pumping effect technique. This finding contrasts with the results of a
+prior study conducted on YIG/Pt/CuOx, which reported the opposite effect. On
+the other hand, when we added the same $CuOx(3nm)$ layer to $YIG/Ti(4nm)$
+structures, there was not much change in the spin pumping signal. This occurred
+because Ti does not generate much orbital current at the $Ti/CuOx$ interface,
+unlike Pt, due to its weaker spin-orbit coupling. Interestingly, when we added
+the $CuOx(3nm)$ layer to $SiO_{2}/Py(5nm)/Pt(4nm)$ structures, the spin pumping
+signal increased. However, in $SiO_{2}/CuOx(3nm)/Pt(4nm)/Py(5nm)$ structures,
+the signal decreased. Finally, we delve into a theoretical analysis of the spin
+(orbital) Hall effect in YIG/Heavy-metal systems. These findings have the
+potential to advance research in the innovative field of orbitronics and
+contribute to the development of new technologies based on spin-orbital
+conversion.",2309.08857v2
+2023-11-22,Spin-orbit interaction driven terahertz nonlinear dynamics in transition metals,"The interplay of electric charge, spin, and orbital polarizations, coherently
+driven by picosecond long oscillations of light fields in spin-orbit coupled
+systems, is the foundation of emerging terahertz spintronics and orbitronics.
+The essential rules for how terahertz light interacts with these systems in a
+nonlinear way are still not understood. In this work, we demonstrate a
+universally applicable electronic nonlinearity originating from spin-orbit
+interactions in conducting materials, wherein the interplay of light-induced
+spin and orbital textures manifests. We utilized terahertz harmonic generation
+spectroscopy to investigate the nonlinear dynamics over picosecond timescales
+in various transition metal films. We found that the terahertz harmonic
+generation efficiency scales with the spin Hall conductivity in the studied
+films, while the phase takes two possible values (shifted by {\pi}), depending
+on the d-shell filling. These findings elucidate the fundamental mechanisms
+governing non-equilibrium spin and orbital polarization dynamics at terahertz
+frequencies, which is relevant for potential applications of terahertz spin-
+and orbital-based devices.",2311.13272v1
+2021-01-06,Analytically solvable model to the spin Hall effect with Rashba and Dresselhaus spin-orbit couplings,"When the Rashba and Dresslhaus spin-orbit coupling are both presented for a
+two-dimensional electron in a perpendicular magnetic field, a striking
+resemblance to anisotropic quantum Rabi model in quantum optics is found. We
+perform a generalized Rashba coupling approximation to obtain a solvable
+Hamiltonian by keeping the nearest-mixing terms of Laudau states, which is
+reformulated in the similar form to that with only Rashba coupling. Each Landau
+state becomes a new displaced-Fock state with a displacement shift instead of
+the original Harmonic oscillator Fock state, yielding eigenstates in closed
+form. Analytical energies are consistent with numerical ones in a wide range of
+coupling strength even for a strong Zeeman splitting. In the presence of an
+electric field, the spin conductance and the charge conductance obtained
+analytically are in good agreements with the numerical results. As the
+component of the Dresselhaus coupling increases, we find that the spin Hall
+conductance exhibits a pronounced resonant peak at a larger value of the
+inverse of the magnetic field. Meanwhile, the charge conductance exhibits a
+series of plateaus as well as a jump at the resonant magnetic field. Our method
+provides an easy-to-implement analytical treatment to two-dimensional electron
+gas systems with both types of spin-orbit couplings.",2101.01906v1
+2018-05-15,Spin-orbit-coupled Bose-Einstein condensates of rotating polar molecules,"An experimental proposal for realizing spin-orbit (SO) coupling of
+pseudospin-1 in the ground manifold $^1\Sigma(\upsilon=0)$ of (bosonic)
+bialkali polar molecules is presented. The three spin components are composed
+of the ground rotational state and two substates from the first excited
+rotational level. Using hyperfine resolved Raman processes through two select
+excited states resonantly coupled by a microwave, an effective coupling between
+the spin tensor and linear momentum is realized. The properties of
+Bose-Einstein condensates for such SO-coupled molecules exhibiting dipolar
+interactions are further explored. In addition to the SO-coupling-induced
+stripe structures, the singly and doubly quantized vortex phases are found to
+appear, implicating exciting opportunities for exploring novel quantum physics
+using SO-coupled rotating polar molecules with dipolar interactions.",1805.05524v1
+1998-12-22,Modified Double Exchange Model with Novel Spin and Orbital Coupling: Phase Diagram of The Manganites,"From a general model of the Mn oxides R_{1-x}A_{x}MnO_3, we derive an
+effective Hamiltonian in the low-energy subspace using the projection operator
+method, in which a novel coupling between the spin and orbital degrees of
+freedom is included. A phase diagram for temperature T versus doping
+concentration x is computed by means of Monte Carlo simulation. Our result is
+consistent with experimental observations in the Mn oxides with relatively wide
+conduction band, such as Pr_{1-x}Sr_{x} MnO_{3} and La_{1-x}Sr_{x}MnO_{3}.
+According to the obtained orbital ordering, we also predict that the motion of
+charge carriers transforms from three-dimensional to two-dimensional as x is
+increased beyond a critical value.",9812374v1
+2000-11-15,Numerical Renormalization Group Study of Kondo Effect in Unconventional Superconductors,"Orbital degrees of freedom of a Cooper pair play an important role in the
+unconventional superconductivity. To elucidate the orbital effect in the Kondo
+problem, we investigated a single magnetic impurity coupled to Cooper pairs
+with a $p_x +i p_y$ ($d_{x^2-y^2}+id_{xy}$) symmetry using the numerical
+renormalization group method. It is found that the ground state is always a
+spin doublet. The analytical solution for the strong coupling limit explicitly
+shows that the orbital dynamics of the Cooper pair generates the spin 1/2 of
+the ground state.",0011256v2
+2004-01-29,"Orbital Ordering, New Phases, and Stripe Formation in Doped Layered Nickelates","Ground-state properties of layered nickelates are investigated based on the
+orbital-degenerate Hubbard model coupled with lattice distortions, by using
+umerical techniques. The N\'eel state composed of spin S=1 ions is confirmed in
+the undoped limit x=0. At x=1/2, novel antiferromagnetic states, called CE- and
+E-type phases, are found by increasing the Hund's coupling. (3 x^2 - r^2 / 3
+y^2 - r^2)-type orbital ordering is predicted to occur in a checkerboard-type
+charge-ordered state. At x=1/3, both Coulombic and phononic interactions are
+found to be important, since the former stabilizes the spin stripe, while the
+latter leads to the striped charge-order.",0401596v1
+2000-12-04,On the pre-RLO spin-orbit couplings in LMXBs,"We investigate the effect of orbital decay caused by nuclear expansion of a
+(sub)giant star in synchronous binary system. We compare this effect with the
+presence of a magnetic stellar wind and show that the additional transfer of
+orbital angular momentum into spin angular momentum is relatively important --
+especially since it has been shown that the effect of magnetic braking
+saturates at short orbital periods.",0012077v1
+2008-06-25,Hidden Orbital Liquid State Within Ferromagnetically Ordered Metallic SrRuO3,"We have experimentally found related anomalies in electrical resistivity, dc
+and ac magnetic susceptibility, appearing deeply within ferromagnetically
+ordered state in SrRuO3. Lack of Jahn-Teller distortion in this regime rules
+out conventional orbital order, forcing one to describe these in terms of an
+orbital liquid ground state coexisting with ferromagnetic spin order. We
+suggest that weak spin-orbit coupling in such an unusual state underpins the
+observed anomalies.",0806.4198v1
+2016-03-06,Spin-Orbital Entangled Excitonic Insulators in $(t_{2g})^4$ Correlated Electron Systems,"We employ the multi-orbital dynamical mean-field theory to examine the ground
+state of a three-orbital Hubbard model with a relativistic spin-orbit coupling
+(SOC) at four electrons per site. We demonstrate that the interplay between the
+strong electron correlations and the SOC induces a Van Vleck-type nonmagnetic
+insulator and its magnetic exciton condensation. We also find in the moderate
+electron correlation regime that the SOC induces another type of a nonmagnetic
+excitonic insulator, in addition to a relativistic band insulator. The
+characteristic features among these insulators are manifested in the momentum
+resolved single-particle excitations, thus accessible by angle-resolved
+photoemission spectroscopy experiments.",1603.01800v1
+2005-11-11,Periodic-orbit bifurcations as the origin of nuclear deformations,"Semiclassical analysis of shell structures in realistic nuclear potentials
+are presented using periodic-orbit theory. We adopted r^alpha potential model
+and examined classical-quantum correspondence using Fourier transformation
+technique. Spin-orbit coupling is also taken into account in the model
+Hamiltonian. Gross shell structure for a certain combination of surface
+diffuseness and spin-orbit parameters are investigated and its relation to
+pseudospin symmetry is discussed. Analysis of superdeformed shell structure in
+realistic model is also presented.",0511032v1
+2001-09-27,Spin and orbital effects of Cooper pairs coupled to a single magnetic impurity,"The Kondo effect strongly depends on spin and orbital degrees of freedom of
+unconventional superconductivity. We focus on the Kondo effect in the $p_x + i
+p_y$-wave and $d_{x^2 - y^2} + i d_{xy}$-wave superconductors to compare the
+magnetic properties of the spin-triplet and spin-singlet Cooper pairs. The
+difference appears when both of the paired electrons couple to a local spin
+directly. For the $p_x + i p_y$-wave, the ground state is always a spin doublet
+for a $S_{\rm imp} = 1/2$ local spin, and it is always a spin singlet for
+$S_{\rm imp} = 1$. The latter is due to uniaxial spin anisotropy of the triplet
+Cooper pair. For the $d_{x^2 - y^2} + i d_{xy}$-wave, the interchange of ground
+states occurs, which resembles a competition between the Kondo effect and the
+superconducting energy gap in s-wave superconductors. Thus the internal degrees
+of freedom of Cooper pairs give a variety to the Kondo effect.",0109513v2
+2004-08-13,Spin precession due to spin-orbit coupling in a two-dimensional electron gas with spin injection via ideal quantum point contact,"We present the analytical result of the expectation value of spin resulting
+from an injected spin polarized electron into a semi-infinitely extended 2DEG
+plane with [001] growth geometry via ideal quantum point contact. Both the
+Rashba and Dresselhaus spin-orbit couplings are taken into account. A pictorial
+interpretation of the spin precession along certain transport directions is
+given. The spin precession due to the Rashba term is found to be especially
+interesting since it behaves simply like a windshield wiper which is very
+different from the ordinary precession while that due to the Dresselhaus term
+is shown to be crystallographic-direction-dependent. Some crystallographic
+directions with interesting and handleable behavior of spin precession are
+found and may imply certain applicability in spintronic devices.",0408315v2
+2005-05-20,Persistent spin current in spin-orbit coupling systems in the absence of an external magnetic field,"The spin-orbit coupling systems with a zero magnetic field is studied under
+the equilibrium situation, {\it i.e.}, without a voltage bias. A persistent
+spin current is predicted to exist under most circumstances, although the
+persistent charge current and the spin accumulation are identically zero. In
+particular, a two-dimensional quantum wire is investigated in detail.
+Surprisingly, a persistent spin current is found to flow along the confined
+direction, due to the spin precession in accompany with the particle motion.
+This provides an interesting example of constant spin flowing without inducing
+a spin accumulation, contrary to common intuition.",0505517v2
+2005-05-24,Current induced local spin polarization due to the spin-orbit coupling in a two dimensional narrow strip,"The current induced local spin polarization due to weak Rashba spin-orbit
+coupling in narrow strip is studied. In the presence of longitudinal charge
+current, local spin polarizations appear in the sample. The spin polarization
+perpendicular to the plane has opposite sign near the two edges. The in-plane
+spin polarization in the direction perpendicular to the sample edges also
+appears, but does not change sign across the sample. From our scaling analysis
+based on increasing the strip width, the out-of-plane spin polarization is
+important mainly in a system of mesoscopic size, and thus appears not to be
+associated with the spin-Hall effect in bulk samples.",0505576v1
+2007-01-15,Spin-Current-Induced Charge Accumulation and Electric Current in Semiconductor Nanostructures with Rashba Spin-Orbit Coupling,"We demonstrate that the flow of a longitudinal spin current with different
+spin polarization will induce different patterns of charge accumulation in a
+two-terminal strip, or electric current distribution in a four-terminal
+Hall-bar structure, of two-dimensional electron gas with Rashba spin-orbit
+coupling (RSOC). For an in-plane polarized spin current, charges will
+accumulate either by the two lateral edges or around the center of the strip
+structure while, for an out-of-plain polarized spin current, charge densities
+will show opposite signs by the two lateral edges leading to a Hall voltage.
+Our calculation offers a new route to experimentally detect or differentiate
+pure spin currents with various spin polarization.",0701344v2
+2009-09-02,Spin relaxation and combined resonance in two-dimensional electron systems with spin-orbit disorder,"Disorder in spin-orbit (SO) coupling is an important feature of real
+low-dimensional electron structures. We study spin relaxation due to such a
+disorder as well as resulting abilities of spin manipulation. The spin
+relaxation reveals quantum effects when the spatial scale of the randomness is
+smaller than the electron wavelength. Due to the disorder in SO coupling, a
+time-dependent external electric field generates a spatially random
+spin-dependent perturbation. The resulting electric dipole spin resonance in a
+two-dimensional electron gas leads to spin injection in a frequency range of
+the order of the Fermi energy. These effects can be important for possible
+applications in spintronics.",0909.0352v1
+2012-03-12,Spin-filtered edge states in graphene,"Spin orbit coupling changes graphene, in principle, into a two-dimensional
+topological insulator, also known as quantum spin Hall insulator. One of the
+expected consequences is the existence of spin-filtered edge states that carry
+dissipationless spin currents and undergo no back-scattering in the presence of
+non-magnetic disorder, leading to quantization of conductance. Whereas, due to
+the small size of spin orbit coupling in graphene, the experimental observation
+of these remarkable predictions is unlikely, the theoretical understanding of
+these spin-filtered states is shedding light on the electronic properties of
+edge states in other two-dimensional quantum spin Hall insulators. Here we
+review the effect of a variety of perturbations, like curvature, disorder, edge
+reconstruction, edge crystallographic orientation, and Coulomb interactions on
+the electronic properties of these spin filtered states.",1203.2479v1
+2013-03-19,Reading charge transport from spin dynamics on the surface of topological insulator,"Resolving the conductance of the topological surface states (TSSs) from the
+bulk contribution has been a great challenge for studying the transport
+property of topological insulators. By developing a non-purturbative diffusion
+equation that describes fully the spin-charge dynamics in the strong spin-orbit
+coupling regime, we present a proposal to read the charge transport information
+of TSSs from its spin dynamics which can be isolated from the bulk contribution
+by time-resolved second harmonic generation pump-probe measurement. We
+demonstrate the qualitatively different Dyaknov-Perel spin relaxation behavior
+between the TSSs and the two-dimensional spin-orbit coupling electron gas. The
+decay time of both in-plane and out-of-plane spin polarization is naturally
+proved to be identical to the charge transport time. The out-of-plane spin
+dynamics is shown to be in the experimentally reachable regime of the
+femtosecond pump probe spectroscopy and thereby we suggest experiments to
+detect the charge transport property of the TSSs from their unique spin
+dynamics.",1303.4478v3
+2017-01-26,Path to stable quantum spin liquids in spin-orbit coupled correlated materials,"The spin liquid phase is one of the prominent strongly interacting
+topological phases of matter whose unambiguous confirmation is yet to be
+reached despite intensive experimental efforts on numerous candidate materials.
+Recently, a new family of correlated honeycomb materials, in which strong
+spin-orbit coupling allows for various bond-dependent spin interactions, have
+been promising candidates to realize the Kitaev spin liquid. Here we study a
+model with bond-dependent spin interactions and show numerical evidence for the
+existence of an extended quantum spin liquid region, which is possibly
+connected to the Kitaev spin liquid state. These results are used to provide an
+explanation of the scattering continuum seen in neutron scattering on
+$\alpha$-RuCl$_3$.",1701.07837v2
+2008-07-04,Quantum interference and spin polarization on Rashba double quantum dots,"We report on the quantum interference and spin accumulation on double quantum
+dots with Rashba spin-orbit coupling and electron-electron interaction, based
+on the Keldysh nonequilibrium Green function formalism. It is shown that Rashba
+spin-orbit interaction can strongly affect the conductance spectrum. By
+gradually increasing the Rashba parameter from zero, Fano resonances in strong
+overlap regime continuously evolve to resolve antiresonances. This transition
+is ascribed to the phase shift of couplings between molecular states and the
+lead due to spin precession. We also show that both bias and Rashba effect
+strengthen the induced spin polarization in this device. For particular energy
+position, up- and down-spin electron occupation can intersect to form a
+crossing point. Spin polarization on different side of this point has opposite
+sign in consequence. The magnitude and direction of spin polarization are
+therefore controllable by tuning the dot levels and the Rashba parameter
+through gates.",0807.0670v1
+2015-12-10,The Elliott-Yafet theory of spin relaxation generalized for large spin-orbit coupling,"We generalize the Elliott-Yafet (EY) theory of spin relaxation in metals with
+inversion symmetry for the case of large spin-orbit coupling (SOC). The EY
+theory treats the SOC to the lowest order but this approach breaks down for
+metals of heavy elements (such as e.g. caesium or gold), where the SOC energy
+is comparable to the relevant band-band separation energies. The generalized
+theory is presented for a four-band model system without band dispersion, where
+analytic formulae are attainable for arbitrary SOC for the relation between the
+momentum- and spin-relaxation rates. As an extended description, we also
+consider an empirical pseudopotential approximation where SOC is deduced from
+the band potential (apart from an empirical scaling constant) and the
+spin-relaxation rate can be obtained numerically. Both approaches recover the
+usual EY theory for weak SOC and give that the spin-relaxation rate approaches
+the momentum-relaxation rate in the limit of strong SOC. We argue that this
+limit is realized in gold by analyzing spin relaxation data. A calculation of
+the $g$-factor shows that the empirical Elliott-relation, which links the
+$g$-factor and spin-relaxation rate, is retained even for strong SOC.",1512.03204v1
+2017-07-14,Out-of-plane carrier spin in transition-metal dichalcogenides under electric current,"In a multilayer comprising ferromagnet and heavy metal, in-plane carrier spin
+is induced by applied electric current owing to Rashba spin-orbit coupling,
+while the out-of-plane component is absent. We propose the out-of-plane carrier
+spin can emerge in ferromagnetic transition-metal dichalcogenides monolayer, by
+symmetry arguments and first-principles calculations. An intrinsic spin-orbit
+coupling in the monolayer provides valley-contrasting Zeeman-type spin
+splitting for generating the vertical induced spin. The current direction can
+be exploited to tune the induced spin, accompanied with valley polarization.
+The exotic spin accumulation paves an accessible way for perpendicular
+magnetization switching and electric control of valleys.",1707.04548v2
+2017-10-26,Spin dynamics in helical molecules with non-linear interactions,"It is widely admitted that the helical conformation of certain chiral
+molecules may induce a sizable spin selectivity observed in experiments. Spin
+selectivity arises as a result of the interplay between a helicity-induced
+spin-orbit coupling and electric dipole fields in the molecule. From the
+theoretical point of view, different phenomena might affect the spin dynamics
+in helical molecules, such as quantum dephasing, dissipation and the role of
+metallic contacts. Previous studies neglected the local deformation of the
+molecule about the carrier thus far, but this assumption seems unrealistic to
+describe charge transport in molecular systems. We introduce an effective model
+describing the electron spin dynamics in a deformable helical molecule with
+weak spin-orbit coupling. We find that the electron-lattice interaction allows
+the formation of stable solitons such as bright solitons with well defined spin
+projection onto the molecule axis. We present a thorough study of these bright
+solitons and analyze their possible impact on the spin dynamics in deformable
+helical molecules.",1710.09582v1
+2019-06-27,Perspectives of Electrically generated spin currents in ferromagnetic materials,"Spin-orbit coupling enables charge currents to give rise to spin currents and
+vice versa, which has applications in non-volatile magnetic memories, miniature
+microwave oscillators, thermoelectric converters and Terahertz devices. In the
+past two decades, a considerable amount of research has focused on electrical
+spin current generation in different types of nonmagnetic materials. However,
+electrical spin current generation in ferromagnetic materials has only recently
+been actively investigated. Due to the additional symmetry breaking by the
+magnetization, ferromagnetic materials generate spin currents with different
+orientations of spin direction from those observed in nonmagnetic materials.
+Studies centered on ferromagnets where spin-orbit coupling plays an important
+role in transport open new possibilities to generate and detect spin currents.
+We summarize recent developments on this subject and discuss unanswered
+questions in this emerging field.",1906.11772v1
+2017-11-04,Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot,"Understanding and control of the spin relaxation time $T_1$ is among the key
+challenges for spin based qubits. A larger $T_1$ is generally favored, setting
+the fundamental upper limit to the qubit coherence and spin readout fidelity.
+In GaAs quantum dots at low temperatures and high in-plane magnetic fields $B$,
+the spin relaxation relies on phonon emission and spin-orbit coupling. The
+characteristic dependence $T_1 \propto B^{-5}$ and pronounced $B$-field
+anisotropy were already confirmed experimentally. However, it has also been
+predicted 15 years ago that at low enough fields, the spin-orbit interaction is
+replaced by the coupling to the nuclear spins, where the relaxation becomes
+isotropic, and the scaling changes to $T_1 \propto B^{-3}$. We establish these
+predictions experimentally, by measuring $T_1$ over an unprecedented range of
+magnetic fields -- made possible by lower temperature -- and report a maximum
+$T_1 = 57\pm15$ s at the lowest fields, setting a new record for the electron
+spin lifetime in a nanostructure.",1711.01474v1
+2020-09-11,Spin entanglement via STM current,"We consider a system of two spins under a scanning tunneling microscope bias
+and derive its master equation. We find that the tunneling elements to the
+electronic contacts (tip and substrate) generate an exchange interaction
+between the spins, as well as a Dzyaloshinskii-Moriya interaction in the
+presence of spin-orbit coupling. The tunnel current spectrum then shows
+additional lines compared to conventional spin resonance experiments. When the
+spins have degenerate Larmor frequencies and equal tunneling amplitudes
+(without spin-orbit), there is a dark state with vanishing decay rate. The
+coupling to the electronic environment generates significant spin-spin
+entanglement via the dark state, even if the initial state is non-entangled.",2009.05452v2
+2021-06-29,Spin-valley qubits in gated quantum dots in a single layer of transition metal dichalcogenides,"We develop a microscopic and atomistic theory of electron spin-based qubits
+in gated quantum dots in a single layer of transition metal dichalcogenides.
+The qubits are identified with two degenerate locked spin and valley states in
+a gated quantum dot. The two-qubit states are accurately described using a
+multi-million atom tight-binding model solved in wavevector space. The
+spin-valley locking and strong spin-orbit coupling result in two degenerate
+states, one of the qubit states being spin-down located at the $+K$ valley of
+the Brillouin zone, and the other state located at the $-K$ valley with spin
+up. We describe the qubit operations necessary to rotate the spin-valley qubit
+as a combination of the applied vertical electric field, enabling spin-orbit
+coupling in a single valley, with a lateral strongly localized valley-mixing
+gate.",2106.15090v2
+2021-07-22,Spin-orbit effects for compact binaries in scalar-tensor gravity,"Gravitational waves provide us with a new window into our Universe, and have
+already been used to place strong constrains on the existence of light scalar
+fields, which are a common feature in many alternative theories of gravity.
+However, spin effects are still relatively unexplored in this context. In this
+work, we construct an effective point-particle action for a generic spinning
+body that can couple both conformally and disformally to a real scalar field,
+and we show that requiring the existence of a self-consistent solution
+automatically implies that if a scalar couples to the mass of a body, then it
+must also couple to its spin. We then use well-established effective field
+theory techniques to conduct a comprehensive study of spin-orbit effects in
+binary systems to leading order in the post-Newtonian (PN) expansion. Focusing
+on quasicircular nonprecessing binaries for simplicity, we systematically
+compute all key quantities, including the conservative potential, the orbital
+binding energy, the radiated power, and the gravitational-wave phase. We show
+that depending on how strongly each member of the binary couples to the scalar,
+the spin-orbit effects that are due to a conformal coupling first enter into
+the phase at either 0.5PN or 1.5PN order, while those that arise from a
+disformal coupling start at either 3.5PN or 4.5PN order. This suppression by
+additional PN orders notwithstanding, we find that the disformal spin-orbit
+terms can actually dominate over their conformal counterparts due to an
+enhancement by a large prefactor. Accordingly, our results suggest that
+upcoming gravitational-wave detectors could be sensitive to disformal
+spin-orbit effects in double neutron star binaries if at least one of the two
+bodies is sufficiently scalarised.",2107.10841v2
+1997-12-31,Disorder-Induced Broadening of the Density of States for 2D Electrons with Strong Spin-Orbit Coupling,"We study theoretically the disorder-induced smearing of the density of states
+in a two-dimensional electron system taking into account a spin-orbit term in
+the Hamiltonian of a free electron. We show that the characteristic energy
+scale for the smearing increases with increasing the spin-orbit coupling. We
+also demonstrate that in the limit of a strong spin-orbit coupling the diagrams
+with self-intersections give a parametrically small contribution to the
+self-energy. As a result, the coherent potential approximation becomes
+asymptotically exact in this limit. The tail of the density of states has the
+energy scale which is much smaller than the magnitude of the smearing. We find
+the shape of the tail using the instanton approach.",9712328v1
+2001-05-10,Weak localization and conductance fluctuations of a chaotic quantum dot with tunable spin-orbit coupling,"In a two-dimensional quantum dot in a GaAs heterostructure, the spin-orbit
+scattering rate is substantially reduced below the rate in a bulk
+two-dimensional electron gas [B.I. Halperin et al, Phys. Rev. Lett. 86, 2106
+(2001)]. Such a reduction can be undone if the spin-orbit coupling parameters
+acquire a spatial dependence, which can be achieved, e.g., by a metal gate
+covering only a part of the quantum dot. We calculate the effect of such
+spatially non-uniform spin-orbit scattering on the weak localization correction
+and the universal conductance fluctuations of a chaotic quantum dot coupled to
+electron reservoirs by ballistic point contacts, in the presence of a magnetic
+field parallel to the plane of the quantum dot.",0105222v3
+2006-02-01,Screening properties of the two-dimensional electron gas with spin-orbit coupling,"We study screening properties of the two-dimensional electron gas with Rashba
+spin-orbit coupling. Calculating the dielectric function within the random
+phase approximation, we describe the new features of screening induced by
+spin-orbit coupling, which are the extension of the region of particle-hole
+excitations and the spin-orbit-induced suppression of collective modes. The
+required polarization operator is calculated in an analytic form without any
+approximations. Carefully deriving its static limit, we prove the absence of a
+small-$q$ anomaly at zero frequency. On the basis of our results at finite
+frequencies we establish the new boundaries of the particle-hole continuum and
+calculate the SO-induced lifetime of collective modes such as plasmons and
+longitudinal optical phonons. According to our estimates, these effects can be
+resolved in inelastic Raman scattering. We evaluate the experimentally
+measurable dynamic structure factor and establish the range of parameters where
+the described phenomena are mostly pronounced.",0602029v2
+2006-03-02,Optical Conductivity of a Two-Dimensional Electron Liquid with Spin-Orbit Interaction,"The interplay of electron-electron interactions and spin-orbit coupling leads
+to a new contribution to the homogeneous optical conductivity of the electron
+liquid. The latter is known to be insensitive to many-body effects for a
+conventional electron system with parabolic dispersion. The parabolic spectrum
+has its origin in the Galilean invariance which is broken by spin-orbit
+coupling. This opens up a possibility for the optical conductivity to probe
+electron-electron interactions. We analyze the interplay of interactions and
+spin-orbit coupling and obtain optical conductivity beyond RPA.",0603058v3
+2008-01-31,Singlet-Triplet Relaxation in Two-electron Silicon Quantum Dots,"We investigate the singlet-triplet relaxation process of a two electron
+silicon quantum dot. In the absence of a perpendicular magnetic field, we find
+that spin-orbit coupling is not the main source of singlet-triplet relaxation.
+Relaxation in this regime occurs mainly via virtual states and is due to
+nuclear hyperfine coupling. In the presence of an external magnetic field
+perpendicular to the plane of the dot, the spin-orbit coupling is important and
+virtual states are not required. We find that there can be strong anisotropy
+for different field directions: parallel magnetic field can increase
+substantially the relaxation time due to Zeeman splitting, but when the
+magnetic field is applied perpendicular to the plane, the enhancement of the
+spin-orbit effect shortens the relaxation time. We find the relaxation to be
+orders of magnitude longer than for GaAs quantum dots, due to weaker hyperfine
+and spin-orbit effects.",0801.4898v1
+2009-11-15,Interplay between Kondo physics and spin-orbit coupling in carbon nanotube quantum dots,"We investigate the influence of spin-orbit coupling on the Kondo effects in
+carbon nanotube quantum dots, using the numerical renormalization group
+technique. A sufficiently large spin-orbit coupling is shown to destroy the
+SU(4) Kondo effects at zero magnetic field, leaving only two SU(2) Kondo
+effects in the one- and three-electron Coulomb blockade valleys. On applying a
+finite magnetic field, two additional, spin-orbit induced SU(2) Kondo effects
+arise in the three- and two-electron valleys. Using physically realistic model
+parameters, we calculate the differential conductance over a range of gate
+voltages, temperatures and fields. The results agree well with measurements
+from two different experimental devices in the literature, and explain a number
+of observations that are not described within the standard framework of the
+SU(4) Anderson impurity model.",0911.2886v1
+2010-11-06,Spin-orbit coupling and phase-coherence in InAs nanowires,"We investigated the magnetotransport of InAs nanowires grown by selective
+area metal-organic vapor phase epitaxy. In the temperature range between 0.5
+and 30 K reproducible fluctuations in the conductance upon variation of the
+magnetic field or the back-gate voltage are observed, which are attributed to
+electron interference effects in small disordered conductors. From the
+correlation field of the magnetoconductance fluctuations the phase-coherence
+length l_phi is determined. At the lowest temperatures l_phi is found to be at
+least 300 nm, while for temperatures exceeding 2 K a monotonous decrease of
+l_phi with temperature is observed. A direct observation of the weak
+antilocalization effect indicating the presence of spin-orbit coupling is
+masked by the strong magnetoconductance fluctuations. However, by averaging the
+magnetoconductance over a range of gate voltages a clear peak in the
+magnetoconductance due to the weak antilocalization effect was resolved. By
+comparison of the experimental data to simulations based on a recursive
+two-dimensional Green's function approach a spin-orbit scattering length of
+approximately 70 nm was extracted, indicating the presence of strong spin-orbit
+coupling.",1011.1556v1
+2011-01-19,Exact solutions for a type of electron pairing model with spin-orbit interactions and Zeeman coupling,"A type of electron pairing model with spin-orbit interactions or Zeeman
+coupling is solved exactly in the framework of Richardson ansatz. Based on the
+exact solutions for the case with spin-orbit interactions, it is shown
+rigorously that the pairing order parameter has always the $p+ip$-wave symmetry
+regardless of the strength of pairing interaction, justifying an important
+conclusion obtained by the mean field theory. Analytical results are derived
+for two simple systems with respectively spin-orbit interactions and Zeeman
+coupling.",1101.3740v4
+2011-05-09,"Theoretical Comparison of Rashba Spin-Orbit Coupling in Digitally, Discretely, and Continuously Alloyed Nanostructures","Although most theoretical calculations of quantum wells with non-square
+profiles assume that material composition is varied continuously, it is more
+common in experiment to grow digital alloys. We compare the Rashba spin-orbit
+interaction of triangular wells using continuous, discrete, and digital
+alloying profiles in (001)-grown triangular InSb/Al_f(z)In_(1-f(z))Sb, finding
+a very large difference between digital alloying and the others, including a
+sign change in the Rashba spin-orbit coupling. We find that the interface
+contribution to the Rashba spin-orbit coupling is much larger in the
+continuously- and discretely-alloyed triangular quantum wells than in the
+digitally-alloyed triangular wells, in which it is almost completely absent.
+The electric field contribution, however, is quite similar in all three
+systems. Due to a much stronger doping dependence in all three systems, the
+electric field contribution dominates at higher dopings, although the very
+large offset due to the near absence of interface contribution in
+digitally-alloyed wells persists.",1105.1804v1
+2012-08-10,Acoustic phonon-limited resistivity in spin-orbit coupled 2DEG: Deformation potential and piezoelectric scattering,"We study the interaction between electron and acoustic phonon in a Rashba
+spin-orbit coupled two dimensional electron gas using Boltzmann transport
+theory. Both deformation potential and piezoelectric scattering mechanisms are
+considered in the Bloch-Gruneisen (BG) as well as in the equipartition (EP)
+regimes. Effect of the Rashba spin-orbit interaction on the temperature
+dependence of resistivity in the BG and EP regimes has been discussed. We find
+effective exponent of the temperature dependence of the resistivity in the BG
+regime decreases due to spin-orbit coupling.",1208.2151v3
+2012-12-06,Phonon-drag thermopower and hot-electron energy-loss rate in a Rashba spin-orbit coupled two-dimensional electron system,"We theoretically study phonon-drag contribution to the thermoelectric power
+and hot-electron energy-loss rate in a Rashba spin-orbit coupled
+two-dimensional electron system (2DES) in the Bloch-Gruneisen (BG) regime. We
+assume that electrons interact with longitudinal acoustic phonons through
+deformation potential and with both longitudinal and transverse acoustic
+phonons through piezoelectric potential. Effect of the Rashba spin-orbit
+interaction on magnitude and temperature dependence of the phonon-drag
+thermoelectric power and hot-electron energy-loss rate are discussed. We
+numerically extract the exponent of temperature dependence of the phonon-drag
+thermopower and the energy-loss rate. We find the exponents are strongly
+suppressed due to the presence of the Rashba spin-orbit coupling.",1212.1303v2
+2014-11-08,Spin and Orbital Magnetic Response on the Surface of a Topological Insulator,"Coupling of the spin and orbital degrees of freedom on the surface of a
+strong three-dimensional insulator, on the one hand, and textured magnetic
+configuration in an adjacent ferromagnetic film, on the other, is studied using
+a combination of transport and thermodynamic considerations. Expressing
+exchange coupling between the localized magnetic moments and Dirac electrons in
+terms of the electrons' out-of-plane orbital and spin magnetizations, we relate
+the thermodynamic properties of a general ferromagnetic spin texture to the
+physics in the zeroth Landau level. Persistent currents carried by Dirac
+electrons endow the magnetic texture with a Dzyaloshinski-Moriya interaction,
+which exhibits a universal scaling form as a function of electron temperature,
+chemical potential, and the time-reversal symmetry breaking gap. In addition,
+the orbital motion of electrons establishes a direct magnetoelectric coupling
+between the unscreened electric field and local magnetic order, which furnishes
+complex long-ranged interactions within the magnetic film.",1411.2070v1
+2016-06-11,Spin-Orbit Coupling and Spin Textures in Optical Superlattices,"We proposed and demonstrated a new approach for realizing spin orbit coupling
+with ultracold atoms. We use orbital levels in a double well potential as
+pseudospin states. Two-photon Raman transitions between left and right wells
+induce spin-orbit coupling. This scheme does not require near resonant light,
+features adjustable interactions by shaping the double well potential, and does
+not depend on special properties of the atoms. A pseudospinor Bose-Einstein
+condensate spontaneously acquires an antiferromagnetic pseudospin texture which
+breaks the lattice symmetry similar to a supersolid.",1606.03514v2
+2016-07-18,J-freezing and Hund's rules in spin-orbit-coupled multiorbital Hubbard models,"We investigate the phase diagram of the spin-orbit-coupled three orbital
+Hubbard model at arbitrary filling by means of dynamical mean-field theory
+combined with continuous-time quantum Monte Carlo. We find that the
+spin-freezing crossover occurring in the metallic phase of the non-relativistic
+multiorbital Hubbard model can be generalized to a $\mathbf{J}$-freezing
+crossover, with $\mathbf{J}=\mathbf{L}+\mathbf{S}$, in the spin-orbit-coupled
+case. In the $\mathbf{J}$-frozen regime the correlated electrons exhibit a
+non-trivial flavor selectivity and energy dependence. Furthermore, in the
+regions near $n=2$ and $n=4$ the metallic states are qualitatively different
+from each other, which reflects the atomic Hund's third rule. Finally, we
+explore the appearance of magnetic order from exciton condensation at $n=4$ and
+discuss the relevance of our results for real materials.",1607.05196v2
+2016-09-21,Brillouin-Wigner Theory for Floquet Topological Phase Transitions in Spin-orbit Coupled Materials,"We develop the high frequency expansion based on the Brillouin-Wigner (B-W)
+perturbation theory for driven systems with spin-orbit coupling which is
+applicable to the cases of silicene, germanene and stanene. We compute the
+effective Hamiltonian in the zero photon subspace not only to order
+$O(\omega^{-1})$, but by keeping all the important terms to order
+$O(\omega^{-2})$, and obtain the photo-assisted correction terms to both the
+hopping and the spin-orbit terms, as well as new longer ranged hopping terms.
+We then use the effective static Hamiltonian to compute the phase diagram in
+the high frequency limit and compare it with the results of direct numerical
+computation of the Chern numbers of the Floquet bands, and show that at
+sufficiently large frequencies, the B-W theory high frequency expansion works
+well even in the presence of spin-orbit coupling terms.",1609.06504v1
+2014-03-26,Parity violation in ferromagnet-superconductor heterostructures with strong spin-orbit coupling,"We study spectroscopic properties of ferromagnetic-superconductor
+heterostructures with strong spin-orbit coupling of the Rashba type and in the
+presence of exchange fields. The superconducting layer (film) experiences both
+an intrinsic spin-orbit field and an exchange field due to the proximity to
+ferromagnetic layers (films). We analyse the temperature dependence of the
+order parameter for superconductivity at various values of exchange field and
+spin-orbit coupling, and describe momentum-dependent properties that exhibit
+parity violation. Furthermore, we show that parity violation can be probed in
+tunneling experiments of the single-particle density of states and in
+photoemission experiments of the momentum distribution.",1403.6858v1
+2017-01-28,Appropriate conditions to realize a $p$-wave superfluid state starting from a spin-orbit coupled $s$-wave superfluid Fermi gas,"We theoretically investigate a spin-orbit coupled $s$-wave superfluid Fermi
+gas, to examine the time evolution of the system, after an $s$-wave pairing
+interaction is replaced by a $p$-wave one at $t=0$. In our recent paper, we
+proposed that this manipulation may realize a $p$-wave superfluid Fermi gas,
+because the $p$-wave pair amplitude that is induced in the $s$-wave superfluid
+state by a parity-broken antisymmetric spin-orbit interaction gives a
+non-vanishing $p$-wave superfluid order parameter, immediately after the
+$p$-wave interaction is turned on. In this paper, using a time-dependent
+Bogoliubov-de Gennes theory, we assess this idea under various conditions with
+respect to the $s$-wave and $p$-wave interaction strengths, as well as the
+spin-orbit coupling strength. From these, we clarify that the momentum
+distribution of Fermi atoms in the initial $s$-wave state ($t<0$) is a key to
+produce a large $p$-wave superfluid order parameter. Since the realization of a
+$p$-wave superfluid state is one of the most exciting and difficult challenges
+in cold Fermi gas physics, our results may provide a possible way to accomplish
+this.",1701.08255v1
+2014-05-20,High-Chern-number bands and tunable Dirac cones in $β$-graphyne,"Graphynes represent an emerging family of carbon allotropes that recently
+attracted much interest due to the tunability of the Dirac cones in the band
+structure. Here, we show that the spin-orbit couplings in $\beta$-graphyne
+could produce various effects related to the topological properties of its
+electronic bands. Intrinsic spin-orbit coupling yields high- and tunable
+Chern-number bands, which may host both topological and Chern insulators, in
+the presence and absence of time-reversal symmetry, respectively. Furthermore,
+Rashba spin-orbit coupling can be used to control the position and the number
+of Dirac cones in the Brillouin zone. These findings suggest that
+spin-orbit-related physics in $\beta$-graphyne is very rich, and, in
+particular, that this system could provide a platform for the realization of a
+two-dimensional material with tunable topological properties.",1405.5039v2
+2016-08-03,Magnetoanisotropic Josephson effect due to interfacial spin-orbit fields in superconductor/ferromagnet/superconductor junctions,"We study theoretically the effects of interfacial Rashba and Dresselhaus
+spin-orbit coupling in superconductor/ferromagnet/superconductor (S/F/S)
+Josephson junctions---with allowing for tunneling barriers between the
+layers---by solving the Bogoljubov-de Gennes equation for a realistic
+heterostructure and applying the Furusaki-Tsukada technique to calculate the
+electric current at a finite temperature. The presence of spin-orbit couplings
+leads to out- and in-plane magnetoanisotropies of the Josephson current, which
+are giant in comparison to current magnetoanisotropies in similar normal-state
+ferromagnet/normal metal (F/N) junctions. Especially huge anisotropies appear
+in the vicinity of $ 0 $-$ \pi $ transitions, caused by the exchange-split
+bands in the ferromagnetic metal layer. We also show that the direction of the
+Josephson critical current can be controlled (inducing $ 0 $-$ \pi $
+transitions) by the strength of the spin-orbit coupling and, more crucial, by
+the orientation of the magnetization. Such a control can bring new
+functionalities into Josephson junction devices.",1608.01218v2
+2017-06-17,\emph{Ab initio} calculation of spin-orbit coupling for NV center in diamond exhibiting dynamic Jahn-Teller effect,"Point defects in solids may realize solid state quantum bits. The spin-orbit
+coupling in these point defects plays a key role in the magneto-optical
+properties that determine the conditions of quantum bit operation. However,
+experimental data and methods do not directly yield this highly important data,
+particularly, for such complex systems where dynamic Jahn-Teller (DJT) effect
+damps the spin-orbit interaction. Here, we show for an exemplary quantum bit,
+nitrogen-vacancy (NV) center in diamond, that \emph{ab initio} supercell
+density functional theory provide quantitative prediction for the spin-orbit
+coupling damped by DJT. We show that DJT is responsible for the multiple
+intersystem crossing rates of NV center at cryogenic temperatures. Our results
+pave the way toward optimizing solid state quantum bits for quantum information
+processing and metrology applications.",1706.05523v2
+2018-09-04,Experimental realization of a superfluid stripe phase in a spin-orbit-coupled Bose-Einstein condensate enabled by momentum-space hopping,"In the past few decades, the search for supersolid-like phases has attracted
+great attention in condensed matter and ultracold atom communities. Here we
+experimentally demonstrate a route for realizing a superfluid stripe-phase in a
+spin-orbit coupled Bose-Einstein condensate by employing a weak optical lattice
+to induce momentum-space hopping between two spin-orbit band minima. We
+characterize the striped ground state as a function of lattice coupling
+strength and spin-orbit detuning and find good agreement with mean-field
+simulations. We observe coherent Rabi oscillations in momentum space between
+two band minima and demonstrate a long lifetime of the ground state. Our work
+offers an exciting new and stable experimental platform for exploring
+superfluid stripe-phases and their exotic excitations, which may shed light on
+the properties of supersolid-like states.",1809.01208v1
+2000-06-28,"Doped two orbital chains with strong Hund's rule couplings - ferromagnetism, spin gap, singlet and triplet pairings","Different models for doping of two-orbital chains with mobile $S=1/2$
+fermions and strong, ferromagnetic (FM) Hund's rule couplings stabilizing the
+S=1 spins are investigated by density matrix renormalization group (DMRG)
+methods. The competition between antiferromagnetic (AF) and FM order leads to a
+rich phase diagram with a narrow FM region for weak AF couplings and strongly
+enhanced triplet pairing correlations. Without a level difference between the
+orbitals, the spin gap persists upon doping, whereas gapless spin excitations
+are generated by interactions among itinerant polarons in the presence of a
+level difference. In the charge sector we find dominant singlet pairing
+correlations without a level difference, whereas upon the inclusion of a
+Coulomb repulsion between the orbitals or with a level difference, charge
+density wave (CDW) correlations decay slowest. The string correlation functions
+remain finite upon doping for all models.",0006439v1
+2017-11-15,"Spin-orbit coupling, minimal model and potential Cooper-pairing from repulsion in BiS$_2$-superconductors","We develop the realistic minimal electronic model for recently discovered
+BiS$_2$ superconductors including the spin-orbit coupling based on a
+first-principles band structure calculations. Due to strong spin-orbit
+coupling, characteristic for the Bi-based systems, the tight-binding low-energy
+model necessarily includes $p_x$, $p_y$, and $p_z$ orbitals. We analyze a
+potential Cooper-pairing instability from purely repulsive interaction for the
+moderate electronic correlations using the so-called leading angular harmonics
+approximation (LAHA). For small and intermediate doping concentrations we find
+the dominant instabilities to be $d_{x^2-y^2}$-wave, and $s_{\pm}$-wave
+symmetries, respectively. At the same time, in the absence of the sizable spin
+fluctuations the intra and interband Coulomb repulsion are of the same
+strength, which yields the strongly anisotropic behaviour of the
+superconducting gaps on the Fermi surface in agreement with recent ARPES
+findings. In addition, we find that the Fermi surface topology for BiS$_2$
+layered systems at large electron doping can resembles the doped iron-based
+pnictide superconductors with electron and hole Fermi surfaces with sufficient
+nesting between them. This could provide further boost to increase $T_c$ in
+these systems.",1711.05454v1
+2018-12-07,Flat bands and dynamical localization of spin-orbit coupled Bose-Einstein condensates,"Flat bands and dynamical localization of binary mixtures of Bose-Einstein
+condensates, with spin-orbit coupling subjected to a deep optical lattice which
+is shaking in time and to a periodic time modulation of the Zeeman field, are
+investigated. In contrast with usual dynamical localization in the absence of
+spin-orbit coupling, we find that to fully suppress the tunneling in the system
+the optical lattice shaking is not enough, and a proper tuning of the
+spin-orbit term, achievable via the Zeeman field modulation, is also required.
+This leads to a sequence of Zeeman parameter values where energy bands become
+flat, the tunneling in the system is suppressed, and the dynamical localization
+phenomenon occurs. Exact wave functions at the dynamical localization points
+show that the binary mixture localizes on a dimer with the two components
+occupying different sites. This type of localization occurs in exact form also
+for the ground state of the system at the dynamical localization points in the
+presence of nonlinearity and remains valid, although in approximate form, for a
+wide range of the Zeeman parameter around these points. The possibility of
+observing the above phenomena in real experiments is also briefly discussed.",1812.03164v1
+2018-12-17,Asymmetry and spin-orbit coupling of light scattered from subwavelength particles,"Light scattering and spin-orbit angular momentum coupling phenomena from
+subwavelength objects, with electric and magnetic dipolar responses, are
+receiving an increasing interest. Under illumination by circularly polarized
+light, spin-orbit coupling effects have been shown to lead to significant
+shifts between the measured and actual position of particles. Here we show that
+the remarkable angular dependence of these ""optical mirages"" and those of the
+intensity, degree of circular polarization (DoCP), and spin and orbital angular
+momentum of scattered photons, are all linked and fully determined by the
+dimensionless ""asymmetry parameter"" g, being independent of the specific
+optical properties of the scatterer. Interestingly, for g different from 0, the
+maxima of the optical mirage and angular momentum exchange take place at
+different scattering angles. In addition we show that the g parameter is
+exactly half of the DoCP at a right-angle scattering. This finding opens the
+possibility to infer the whole angular properties of the scattered fields by a
+single far-field polarization measurement.",1812.06812v1
+2019-02-07,Modified spin-orbit couplings in uniaxially strained graphene,"Intrinsic and Rashba spin-orbit interactions in strained graphene is studied
+within the tight-binding (TB) approach. Dependence of Slater-Koster (SK)
+parameters of graphene on strain are extracted by fitting the \emph{ab initio}
+band structure to the TB results. A generalized low-energy effective
+Hamiltonian in the presence of spin-orbit couplings is proposed for strained
+graphene subjected to an external perpendicular electric field. Dependence of
+the modified Rashba strength and other parameters of effective Hamiltonian on
+the strain and electric field are calculated. In order to analyze the influence
+of the applied strain on the electronic properties of the graphene, one must
+take into account the lattice deformation, modifications of the hopping
+amplitudes and shift of the Dirac points. We find that using the strain it is
+possible to control the strength of Rashba and intrinsic spin-orbit couplings
+as well as energy gap at the shifted Dirac points. Meanwhile, the strain
+slightly modifies the topology of low-energy dispersion around the Dirac
+points. We describe the SOCs induced energy splitting as a function of strain.",1902.02656v1
+2020-06-04,The Jahn-Teller effect and spin--orbit coupling: friends or foes?,"The Jahn-Teller effect is one of the most fundamental phenomena important not
+only for physics, but also for chemistry and material science. Solving the
+Jahn-Teller problem and taking into account strong electron correlations we
+show that quantum entanglement of the spin and orbital degrees of freedom via
+spin--orbit coupling strongly affects this effect. Depending on the number of
+$d$ electrons it may quench (electronic configurations $t_{2g}^2$, $t_{2g}^4$,
+and $t_{2g}^5$), partially suppress ($t_{2g}^1$) or in contrast induce
+($t_{2g}^3$) Jahn-Teller distortions. Moreover, in certain situations,
+interplay between the Jahn-Teller effect and spin--orbit coupling promotes
+formation of the ""Mexican hat"" energy surface facilitating various quantum
+phenomena.",2006.03097v1
+2024-01-11,Josephson Junction of Nodal Superconductors with Rashba and Ising Spin-Orbit coupling,"We study the effect of a Rashba spin-orbit coupling on the nodal
+superconducting phase of an Ising superconductor. Such nodal phase was
+predicted to occur when applying an in-plane field beyond the Pauli limit to a
+superconducting monolayer transition metal dichalcogenides (TMD). Generically,
+Rashba spin-orbit is known to lift the chiral symmetry that protects the nodal
+points, resulting in a fully gapped phase. However, when the magnetic field is
+applied along the $\Gamma -K $ line, a residual vertical mirror symmetry
+protects a nodal crystalline phase. We study a single-band tight-binding model
+that captures the low energy physics around the $\Gamma $ pocket of monolayer
+TMD. We calculate the topological properties, the edge state structure, and the
+current phase relation in a Josephson junction geometry of the nodal
+crystalline phase. We show that while the nodal crystalline phase is
+characterized by localized edge modes on non-self-reflecting boundaries, the
+current phase relation exhibits a trivial $2\pi $ periodicity in the presence
+of Rashba spin-orbit coupling.",2401.05685v1
+2007-08-14,Spin torque contribution to the a.c. spin Hall conductivity,"Using the recently proposed definition of a conserved spin-current operator
+[J. Shi et al., Phys. Rev. Lett. 96, 076604 (2006)] we explore the frequency
+dependent spin Hall conductivity for a two-dimensional electron gas with Rashba
+and Dresselhaus spin-orbit interaction in response to an oscillating electric
+field. We show that the optical spectrum of the spin Hall conductivity exhibit
+remarkable changes when the new definition of spin current is applied. Such
+behavior is mainly due to a significant contribution of the spin torque term
+which is absent in the conventional form of the spin current. In addition, it
+is observed that the magnitude and direction of the dynamic spin Hall current
+strongly depends on the electric field frequency as with the interplay of the
+spin-orbit coupling strengths.",0708.1957v2
+2007-11-14,Spin-Hall conductivity of a spin-polarized two-dimensional electron gas with Rashba spin-orbit interaction and magnetic impurities,"The Kubo formula is used to calculate the spin-Hall conductivity in a
+spin-polarized two-dimensional electron system with Rashba-type spin-orbit
+interaction. As in the case of the unpolarized electron system, spin Hall
+conductivity is entirely determined by states at the Fermi level, a property
+that persists in the presence of magnetic impurities. In the clean limit, the
+spin-Hall conductivity decreases monotonically with the Zeeman splitting, a
+result of the ordering effect on the electron spins produced by the magnetic
+field. In the presence of magnetic impurities, the spin-dependent scattering
+determines a finite renormalization of the static part of the fully dressed
+vertex correction of the velocity operator that leads to an enhancement of the
+\sigma_{sH}, an opposite behaviour to that registered in the presence of
+spin-independent disorder. The variation of \sigma_{sH} with the strength of
+the Rashba coupling and the Zeeman splitting is studied.",0711.2127v2
+2011-01-31,Spontaneous Emergence of Persistent Spin Helix from Homogeneous Spin Polarization,"We demonstrate that a homogeneous spin polarization in one-dimensional
+structures of finite length in the presence of Bychkov-Rashba spin-orbit
+coupling decays spontaneously toward a persistent spin helix. The analysis of
+formation of spin helical state is presented within a novel approach based on a
+mapping of spin drift-diffusion equations into a heat equation for a complex
+field. Such a strikingly different and simple method allows generating robust
+spin structures whose properties can be tuned by the strength of the spin orbit
+interaction and/or structure's length. We generalize our results for
+two-dimensional case predicting formation of persistent spin helix in
+two-dimensional channels from homogeneous spin polarization.",1102.0039v1
+2013-11-27,Spin transistor operation driven by the Rashba spin-orbit coupling in the gated nanowire,"The theoretical description has been proposed for the operation of the spin
+transistor in the gate-controlled InAs nanowire. The calculated current-voltage
+characteristics show that the current flowing from the source (spin injector)
+to the drain (spin detector) oscillates as a function of the gate voltage,
+which results from the precession of the electron spin caused by the Rashba
+spin-orbit interaction in the vicinity of the gate. We have studied two
+operation modes of the spin transistor: (A) the ideal operation mode with the
+full spin polarization of electrons in the contacts, the zero temperature, and
+the single conduction channel corresponding to the lowest-energy subband of the
+transverse motion and (B) the more realistic operation mode with the partial
+spin polarization of the electrons in the contacts, the room temperature, and
+the conduction via many transverse subbands taken into account. For mode (A)
+the spin-polarized current can be switched on/off by the suitable tuning of the
+gate voltage, for mode (B) the current also exhibits the pronounced
+oscillations but with no-zero minimal values. The computational results
+obtained for mode (B) have been compared with the recent experimental data and
+a good agreement has been found.",1311.7029v1
+2014-03-11,Spin Dependent Lifetimes and Spin-orbit Hybridization Points in Heusler Compounds,"We present an ab initio calculation of the k and spin-resolved electronic
+lifetimes in the half-metallic Heusler compounds Co(2)MnSi and Co(2)FeSi. We
+determine the spin-flip and spin-conserving contributions to the lifetimes and
+study in detail the behavior of the lifetimes around states that are strongly
+spin-mixed by spin-orbit coupling. We find that, for non-degenerate bands, the
+spin mixing alone does not determine the energy dependence of the (spin-flip)
+lifetimes. Qualitatively, the lifetimes reflect the lineup of electron and hole
+bands. We predict that different excitation conditions lead to drastically
+different spin-flip dynamics of excited electrons and may even give rise to an
+enhancement of the non-equilibrium spin polarization.",1403.2590v2
+2017-06-22,Spin-relaxation time in the impurity band of wurtzite semiconductors,"The spin-relaxation time for electrons in the impurity band of semiconductors
+with wurtzite crystal structure is determined. The effective Dresselhaus
+spin-orbit interaction Hamiltonian is taken as the source of the spin
+relaxation at low temperature and for doping densities corresponding to the
+metallic side of the metal-insulator transition. The spin-flip hopping matrix
+elements between impurity states are calculated and used to set up a
+tight-binding Hamiltonian that incorporates the symmetries of wurtzite
+semiconductors. The spin-relaxation time is obtained from a semiclassical model
+of spin diffusion, as well as from a microscopic self-consistent diagrammatic
+theory of spin and charge diffusion in doped semiconductors. Estimates are
+provided for particularly important materials. The theoretical spin-relaxation
+times compare favorably with the corresponding low-temperature measurements in
+GaN and ZnO. For InN and AlN, we predict that tuning of the spin-orbit coupling
+constant induced by an external potential leads to a potentially dramatic
+increase of the spin-relaxation time related to the mechanism under study.",1706.07318v1
+2021-10-30,"Excitonic Correlations, Spin-State Ordering, and Magnetic-Field Effects in One-Dimensional Two-Orbital Hubbard Model for Spin-Crossover Region","The electronic properties of excitonic insulators have been examined
+precisely in recent years. Pictures of exciton condensation may be applied to
+the spin-state transition observed in perovskite cobalt oxides. We examine the
+crystal-field and magnetic-field dependences of spatial spin structures on the
+basis of the density matrix renormalization group method using an effective
+model for the one-dimensional two-orbital Hubbard model in strong-coupling
+limit. We find an excitonic insulating (EI) phase and a spin-state ordering
+(SSO) phase in the intermediate region between low-spin and high-spin phases.
+In the EI phase, spin-triplet excitons are spatially fluctuating due to quantum
+effects, and an incommensurate spin correlation realizes. The analyses of a
+spin gap and degeneracy of entanglement spectra suggest the realization of the
+Haldane-like edge state in the EI phase. In the SSO phase, 3-fold or
+incommensurate SSO structures realize depending on the crystal-field splitting.
+These structures are stabilized as a result of the competition of exchange
+interactions between spin states.",2111.00209v4
+2018-09-03,Antiferromagnetic spin valve from heterostructure of two-dimensional hexagonal crystals,"Spin valves consisting of heterostructures of single-layer hexagonal crystal
+on an antiferromagnetic substrate or of bilayer hexagonal crystal intercalated
+between two (anti)ferromagnetic insulators, with the current-in-plane geometry,
+are proposed. The two-dimensional hexagonal crystals such as graphene,
+silicene, germanene, and stanene are modeled by the tight binding model of
+honeycomb lattice. The magnetization orientation of the antiferromagnetic
+substrate(s) controls the band gap and topological properties of bulk, which in
+turn control the transport of three types of spin valve geometries: (i) the
+in-plane transport of bulk; (ii) the transport of topological edge states along
+nanoribbon with bulk gap; (iii) the transport of chiral edge state along domain
+wall. The heterostructures are investigated by a tight binding model with an
+(anti)ferromagnetic exchange field, Hubbard interaction and(or) spin-orbital
+coupling. For the first type of spin valve geometry, the Hubbard interaction
+could enlarged the effective band gap of bulk, which in turn improve the
+sensitivity of the spin valves to the antiferromagnetic exchange field. For the
+second and third types of spin valve geometries, the topological phase diagrams
+of varying types of heterostructures with spin-orbital coupling serve as
+guideline for designing the spin valve. The coexistence of the Hubbard
+interaction and the spin-orbital coupling could enlarge the topological gap in
+bulk and improve the quality of the chiral edge states at the domain walls
+between regions with different topological numbers.",1809.00597v4
+2022-04-05,Quantum spin Hall effect in two-dimensional metals without spin-orbit coupling,"The quantum spin Hall effect has been observed in topological insulators
+using spin-orbit coupling as the probe, but it has not yet been observed in a
+metal. An experiment is proposed to measure the quantum spin Hall effect of an
+electron or hole in a two-dimensional (2D) metal by using the previously
+unexplored but relativistically generated 2D quantum spin Hall Hamiltonian, but
+without using spin-orbit coupling. A long cylindrical solenoid lies normally
+through the inner radius of a 2D metallic Corbino disk. The current $I_S$
+surrounding the solenoid produces an azimuthal magnetic vector potential but no
+magnetic field in the disk. In addition, a radial electric field is generated
+across the disk by imposing either (a) a potential difference $\Delta v$ or (b)
+a radial charge current ${\bm I}$ across its inner and outer radii. Combined
+changes in $I_S$ and in either $\Delta v$ or ${\bm I}$ generate spontaneously
+quantized azimuthal charge and spin currents. The experiment is designed to
+measure these quantized azimuthal charge and spin currents in the disk
+consistently. The quantum Hamiltonians for experiments (a) and (b) are both
+solved exactly. A method to control the Joule heating is presented, which could
+potentially allow the quantum spin Hall measurements to be made at room
+temperature. Extensions of this design to an array of thermally-managed
+solenoids, each surrounded by thermally-managed stacks of 2D metallic Corbino
+disks, could function as a quantum computer that could potentially operate at
+room temperature.",2204.01949v1
+2000-02-14,Effect of the Orbital Level Difference in Doped Spin-1 Chains,"Doping of a two-orbital chain with mobile S=1/2 Fermions and strong Hund's
+rule couplings stabilizing the S=1 spins strongly depends on the presence of a
+level difference among these orbitals. By DMRG methods we find a finite spin
+gap upon doping and dominant pairing correlations without level-difference,
+whereas the presence of a level difference leads to dominant charge density
+wave (CDW) correlations with gapless spin-excitations. The string correlation
+function also shows qualitative differences between the two models.",0002193v2
+2006-04-01,Temperature effects in a spin-orbital model for manganites,"We study a two-dimensional effective orbital superexchange model derived for
+strongly correlated e_g electrons coupled to t_{2g} core spins in layered
+manganites. One finds that the ferromagnetic and antiferromagnetic correlations
+closely compete, and small changes of parameters can switch the type of
+magnetic order. For the same reason, spin order is easily destroyed with rising
+temperature, while alternating orbital correlations can persist to temperatures
+where FM order has already melted. A scenario for the AF phase observed in
+LaSrMnO_4 is presented.",0604016v1
+2006-04-07,The Jahn-Teller theorem for 3d ions and their compounds,"In contrary to customarily consideration of the Jahn-Teller theorem for
+3d-ion compounds in the orbital space only we point out that it has to be
+considered in the spin-orbital space. It is despite the weakness of the
+intraatomic spin-orbit coupling. A direct motivation for this paper is an
+erroneous claim of a recent Phys. Rev. Lett. 96 (2006) 027201 paper that the
+high-spin t2g4eg2 state of the 3d6 configuration is not Jahn-Teller active.",0604207v1
+2009-02-21,Extreme spin-orbit coupling in Hermite-Gaussian beams in a uniaxial crystal,"Transformation of the spin and orbital angular momentum of Hermite-Gaussian
+beams of a complex and real argument propagating through a uniaxial crystal is
+considered. We revealed that the spin and orbital angular momentum of the
+complex argument HG beam experience a sharp splashes whereas such an intense
+conversion process is not inherent in a real argument HG beams. The reasons and
+conditions of the resonance effect are brought to light.",0902.3716v1
+2009-06-04,Spin-orbit effects in a graphene bipolar pn junction,"A graphene $pn$ junction is studied theoretically in the presence of both
+intrinsic and Rashba spin-orbit couplings. We show that a crossover from
+perfect reflection to perfect transmission is achieved at normal incidence by
+tuning the perpendicular electric field. By further studying angular dependent
+transmission, we demonstrate that perfect reflection at normal incidence can be
+clearly distinguished from trivial band gap effects. We also investigate how
+spin-orbit effects modify the conductance and the Fano factor associated with a
+potential step in both $nn$ and $np$ cases.",0906.0775v2
+2012-03-05,Robustness of odd-parity superconductivity with spin-orbit locking against disorder,"Unconventional superconductors host a plethora of interesting physical
+phenomena. However, the standard theory of superconductivity suggests that
+unconventional pairing is highly sensitive to disorder, and hence can only be
+observed in ultraclean systems. We find that due to an emergent chiral
+symmetry, spin-orbital locking can parametrically suppress pair decoherence
+introduced by impurity scattering in odd-parity superconductors. Our work
+demonstrates that disorder is not an obstacle to realize odd-parity
+superconductivity in materials with strong spin-orbit coupling.",1203.1055v2
+2013-10-10,Asymmetry in effective fields of spin-orbit torques in Pt/Co/Pt stacks,"Measurements of switching via spin-orbit coupling (SOC) mechanisms are
+discussed for a pair of inverted Pt/Co/Pt stacks with asymmetrical Pt
+thicknesses. Taking into account the planar Hall effect contribution, effective
+fields of spin-orbit torques (SOT) are evaluated using lock-in measurements of
+the first and second harmonics of the Hall voltage. Reversing the stack
+structure leads to significant asymmetries in the switching behavior, including
+clear evidence of a nonlinear current dependence of the transverse effective
+field. Our results demonstrate potentially complex interplay in devices with
+all-metallic interfaces utilizing SOT.",1310.2771v1
+2014-08-04,Effect of spin-orbit interactions on the 0.7 anomaly in quantum point contacts,"We study how the conductance of a quantum point contact is affected by
+spin-orbit interactions, for systems at zero temperature both with and without
+electron-electron interactions. In the presence of spin-orbit coupling, tuning
+the strength and direction of an external magnetic field can change the
+dispersion relation and hence the local density of states in the point contact
+region. This modifies the effect of electron-electron interactions, implying
+striking changes in the shape of the 0.7-anomaly and introducing additional
+distinctive features in the first conductance step.",1408.0746v2
+2017-03-14,Spin-Orbit Dirac Fermions in 2D Systems,"We propose a novel model for including spin-orbit interactions in buckled two
+dimensional systems. Our results show that in such systems, intrinsic
+spin-orbit coupling leads to a formation of Dirac cones, similar to Rashba
+model. We explore the microscopic origins of this behaviour and confirm our
+results using DFT calculations.",1703.04713v1
+2000-01-29,The g-factors of discrete levels in nanoparticles,"Spin-orbit scattering suppresses Zeeman splitting of individual energy levels
+in small metal particles. This suppression becomes significant when the
+spin-orbit scattering rate \tau_{so}^{-1} is comparable with the quantum level
+spacing \delta. The g-factor exhibits mesoscopic fluctuations; at small
+\delta\tau_{so} it is distributed according to the Maxwell distribution. At
+\delta\tau_{so}\to 0 the average g-factor levels off at a small value
+g\sim(l/L)^{1/2} given by the ratio of the electron mean free path l to the
+particle size L. On the contrary, in 2D quantum dots the g-factor is strongly
+enhanced by spin-orbit coupling.",0001431v1
+2000-07-18,Permanent magnetic moment in mesoscopic metals with spin-orbit interaction,"We argue that at zero temperature an isolated metal particle (or an AB ring)
+with spin-orbit interaction and odd number of electrons will have a permanent
+magnetic moment, even in zero magnetic field (flux). In a zero-field-cooled
+state both the direction and the magnitude of the moment varies from particle
+to particle and averages to zero. In a field-cooled state it averages to $\sim
+\mu_{B}(k_{F}\ell) ^{1/2}$. We argue that the permanent moment is due to an
+uncompensated electron in the last occupied (Fermi) level. We introduce an
+effective single-electron Hamiltonian which accounts for spin-orbit coupling.",0007297v1
+2000-10-04,Spin orbit effects in a GaAs quantum dot in a parallel magnetic field,"We analyze the effects of spin-orbit coupling on fluctuations of the
+conductance of a quantum dot fabricated in a GaAs heterostructure. We argue
+that spin-orbit effects may become important in the presence of a large
+parallel magnetic field B_{||}, even if they are negligble for B_{||}=0. This
+should be manifest in the level repulsion of a closed dot, and in reduced
+conductance fluctuations in dots with a small number of open channels in each
+lead, for large B_{||}. Our picture is consistent with the experimental
+observations of Folk et al.",0010064v1
+2004-04-12,Renormalization of spin-orbit coupling in quantum dots due to Zeeman interaction,"We derive analitycally a partial diagonalization of the Hamiltonian
+representing a quantum dot including spin-orbit interaction and Zeeman energy
+on an equal footing. It is shown that the interplay between these two terms
+results in a renormalization of the spin-orbit intensity. The relation between
+this feature and experimental observations on conductance fluctuations is
+discussed, finding a good agreement between the model predictions and the
+experimental behavior.",0404262v2
+2004-06-08,Persistent currents in multicomponent Tomonaga-Luttinger liquid: application to mesoscopic semiconductor ring with spin-orbit interaction,"We study persistent currents in semiconductor ballistic rings with spin-orbit
+Rashba interaction. We use as a working model the multicomponent
+Tomonaga-Luttinger liquid which arises due to the nonparabolic dispersion
+relations of electrons in the rings with rather strong spin-orbit coupling.
+This approach predicts some new characteristic features of persistent currents,
+which may be observed in experimental studies of semiconductor ballistic rings.",0406188v1
+2004-12-02,One-Dimensional S=1 Spin-Orbital Model with Uniaxial Single-Ion Anisotropy,"We investigate ground-state properties of a one-dimensional S=1 spin-orbital
+model with or without uniaxial single-ion anisotropy. By means of the density
+matrix renormalization group method, we compute the ground-state energy, the
+magnetization curves and the correlation functions. We discuss how the
+ground-state properties depend on the two exchange couplings for orbital and
+spin sectors. The phase diagram obtained is compared with that for the S=1/2
+model. We also address the effect of uniaxial single-ion anisotropy.",0412067v1
+2005-04-26,Fermi liquid parameters in 2D with spin-orbit interaction,"We derive analytical expressions for the quasiparticle lifetime tau, the
+effective mass m*, and the Green's function renormalization factor Z for a 2D
+Fermi liquid with electron-electron interaction in the presence of the Rashba
+spin-orbit interaction. We find that the modifications are independent of the
+Rashba band index rho, and occur in second order of the spin-orbit coupling
+alpha. In the derivation of these results, we also discuss the screening of the
+Coulomb interaction, as well as the susceptibility and the self-energy in small
+alpha.",0504661v2
+2005-05-04,Landau level mixing by full spin-orbit interactions,"We study a two-dimensional electron gas in a perpendicular magnetic field in
+the presence of both Rashba and Dresselhaus spin-orbit interactions. Using a
+Bogoliubov transformation we are able to write an approximate formula for the
+Landau levels, thanks to the simpler form of the resulting Hamiltonian. The
+exact numerical calculation of the energy levels, is also made simpler by our
+formulation. The approximate formula and the exact numerical results show
+excellent agreement for typical semiconductors, especially at high magnetic
+fields. We also show how effective Zeeman coupling is modified by spin-orbit
+interactions.",0505090v1
+2003-12-12,"An aberrant ""spin-orbit interaction"" persists in the literature since more than thirty years","An expression for the spin-orbit interaction coupling between different
+levels, which was shown to be aberrant more than thirty years ago is used in a
+recent article [K. Amos, L. Canton, G.Piseni, J. P. Svenne and D. van der
+Knijff, Nucl. Phys. A 728, 65 (2003)]. It leads to expressions quite simpler
+than they should be. Its behavior is in fact of a character opposite to that of
+the spin-orbit interaction used in two-body studies.",0312038v2
+2008-05-21,Exchange energy dominated by large orbital spin-currents in $δ$-Pu,"The electronic structure of the anomalous $\delta$-phase of Pu is analyzed by
+a general and exact reformulation of the exchange energy of the $f$-shell. It
+is found that the dominating contribution to the exchange energy is a
+polarization of orbital spin-currents that preserves the time reversal
+symmetry, hence a non-magnetic solution in accordance with experiments. The
+analysis brings a unifying picture of the role of exchange in the $5f$-shell
+with its relatively strong spin-orbit coupling. The results are in good
+accordance with recent measurements of the branching ratio for the $d$ to $f$
+transition in the actinides.",0805.3241v1
+2011-09-20,Violation of a Bell inequality in two-dimensional spin-orbit hypoentangled subspaces,"Based on spin-orbit coupling induced by q-plates, we present a feasible
+experimental proposal for preparing two-dimensional spatially inhomogeneous
+polarizations of light. We further investigate the quantum correlations between
+these inhomogeneous polarizations of photon pairs generated by spontaneous
+parametric down-conversion, which in essence describe the so-called
+hypoentanglement that is established between composite spin-orbit variables of
+photons. The violation of the Clauser-Horne-Shimony-Holt-Bell inequality is
+predicted with S=2\sqrt2 to illustrate the entangled nature of the cylindrical
+symmetry of spatially inhomogeneous polarizations.",1109.4303v1
+2012-07-24,Implementing the Deutsch's algorithm with spin-orbital angular momentum of photon without interferometer,"Deutsch's algorithm is the simplest quantum algorithm which shows the
+acceleration of quantum computer. In this paper, we theoretically advance a
+scheme to implement quantum Deutsch's algorithm in spin-orbital angular
+momentum space. Our scheme exploits a newly developed optical device called
+""q-plate"", which can couple and manipulate the spin-orbital angular momentum
+simultaneously. This experimental setup is of high stability and efficiency
+theoretically for there is no interferometer in it.",1207.5505v1
+2013-05-29,Wavefunction Vortex Attachment via Matrix Products: Application to Atomic Fermi Gases in Flat Spin-Orbit Bands,"Variational wavefunctions that introduce zeros (vortices) to screen repulsive
+interactions are typically difficult to verify in unbiased microscopic
+calculations. An approach is constructed to insert vortices into ansatz
+wavefunctions using a matrix product representation. This approach opens the
+door to validation of a broad class of Jastrow-based wavefunctions. The
+formalism is applied to a model motivated by experiments on ultracold atomic
+gases in the presence of synthetic spin-orbit coupling. Validated wavefunctions
+show that vortices in atomic Fermi gases with flat Rashba spin-orbit bands
+cluster near the system center and should therefore be directly visible in
+time-of-flight imaging.",1305.6852v2
+2015-04-23,Effects of the interplay between the orbital and spin currents in electroexcitation of light nuclei,"The interplay between the orbital and spin currents in (e,e') excitations of
+light nuclei is discussed. The microscopic analysis of E1 and M2 resonances was
+performed within the particle-core coupling approximation (PCC) of the shell
+model. The comparison of the theoretical results with the available
+experimental data has shown that the studies of relative contributions of the
+orbital and different spin components of the nuclear current into the
+excitation of EJ and MJ resonances could be useful for the identification of
+their configurational structure.",1504.06032v1
+2015-08-19,Effects of spin-orbit coupling and many-body correlations in STM transport through copper phthalocyanine,"The interplay of exchange correlations and spin-orbit interaction (SOI) on
+the many-body spectrum of a copper phtalocyanine (CuPc) molecule and their
+signatures in transport are investigated. We first derive a minimal model
+Hamiltonian in a basis of frontier orbitals which is able to reproduce
+experimentally observed singlet-triplet splittings; in a second step SOI
+effects are included perturbatively. Major consequences of the SOI are the
+splitting of former degenerate levels and a magnetic anisotropy, which can be
+captured by an effective low-energy spin Hamiltonian. We show that STM-based
+magnetoconductance measurements can yield clear signatures of both these SOI
+induced effects.",1508.04647v1
+2011-11-23,Spin-orbit Interaction induced Singlet-Triplet Resonant Raman Transitions in Quantum-dot Helium,"From our theoretical studies of resonant Raman transitions in two-electron
+quantum dots (artificial helium atoms) we show that in this system, the
+singlet-triplet Raman transitions are allowed (in polarized configuration) only
+in the presence of spin-orbit interactions. With an increase of the applied
+magnetic field this transition dominates over the singlet-singlet and
+triplet-triplet transitions. This intriguing effect can therefore be utilized
+to tune Raman transitions as well as the spin-orbit coupling in few-electron
+quantum dots.",1111.5460v1
+2019-06-23,Quantum Ferromagnetic Transition in Clean Dirac Metals,"The ferromagnetic quantum phase transition in clean metals with a negligible
+spin-orbit interaction is known to be first order due to a coupling of the
+magnetization to soft fermionic particle-hole excitations. A spin-orbit
+interaction gives these excitations a mass, suggesting the existence of a
+ferromagnetic quantum critical point in metals with a strong spin-orbit
+interaction. We show that this expectation is not borne out in a large class of
+materials with a Dirac spectrum, since the chirality degree of freedom leads to
+new soft modes that again render the transition first order.",1906.09605v1
+2014-08-28,Stable non-Fermi liquid phase of itinerant spin-orbit coupled ferromagnets,"Direct coupling between gapless bosons and a Fermi surface results in the
+destruction of Landau quasiparticles and a breakdown of Fermi liquid theory.
+Such a non-Fermi liquid phase arises in spin-orbit coupled ferromagnets with
+spontaneously broken continuous symmetries due to strong coupling between
+rotational Goldstone modes and itinerant electrons. These systems provide an
+experimentally accessible context for studying non-Fermi liquid physics.
+Possible examples include low-density Rashba coupled electron gases, which have
+a natural tendency towards spontaneous ferromagnetism, or topological insulator
+surface states with proximity-induced ferromagnetism. Crucially, unlike the
+related case of a spontaneous nematic distortion of the Fermi surface, for
+which the non-Fermi liquid regime is expected to be masked by a superconducting
+dome, we show that the non-Fermi liquid phase in spin-orbit coupled
+ferromagnets is stable.",1408.6826v2
+2020-12-18,Superradiant phase transition with cavity assisted dynamical spin-orbit coupling,"Superradiant phase transition represents an important quantum phenomenon that
+shows the collective excitations based on the coupling between atoms and cavity
+modes. The spin-orbit coupling is another quantum effect which induced from the
+interaction of the atom internal degrees of freedom and momentum of
+center-of-mass. In this work, we consider the cavity assisted dynamical
+spin-orbit coupling which comes from the combination of these two effects. It
+can induce a series of interesting quantum phenomena, such as the flat spectrum
+and the singularity of the excitation energy spectrum around the critical point
+of quantum phase transition. We further discuss the influence of atom decay and
+nonlinear coupling to the phase diagram. The atom decay suppresses the
+singularity of the phase diagram and the nonlinear coupling can break the
+symmetric properties of the phase transition. Our work provide the theoretical
+methods to research the rich quantum phenomena in this dynamic many-body
+systems.",2012.10098v1
+2020-10-01,Modeling coupled spin and lattice dynamics,"A unified model of molecular and atomistic spin dynamics is presented
+enabling simulations both in microcanonical and canonical ensembles without the
+necessity of additional phenomenological spin damping. Transfer of energy and
+angular momentum between the lattice and the spin systems is achieved by a
+coupling term based upon the spin-orbit interaction. The characteristic spectra
+of the spin and phonon systems are analyzed for different coupling strength and
+temperatures. The spin spectral density shows magnon modes together with the
+uncorrelated noise induced by the coupling to the lattice. The effective
+damping parameter is investigated showing an increase with both coupling
+strength and temperature. The model paves the way to understanding magnetic
+relaxation processes beyond the phenomenological approach of the Gilbert
+damping and the dynamics of the energy transfer between lattice and spins.",2010.00642v1
+2018-02-14,Spin-lattice Coupling in U(1) Quantum Spin Liquids,"Quantum spin liquids (QSLs) are exotic phases with intrinsic massive
+entanglements. Instead of microscopic spins, fractionalized particles and gauge
+fluctuations are emergent, revealing QSLs' exotic natures. Quantum spins with
+strong spin-orbit coupling on a pyrchlore lattice, for example Pr2Zr2O7, are
+suggested to host a U(1) QSL with emergent photons, gapless excitations without
+breaking any symmetries, as well as emergent monopoles. One of the key issues
+in QSLs is an interplay between emergent degrees of freedom of QSLs and
+conventional degrees of freedom, and we investigate the interplay by
+constructing a general theory of spin-lattice coupling in U(1) QSLs. We find
+that the coupling induces characteristic interplay between phonons and photons.
+For example, photons become qualitatively more stable than phonons at low
+temperature. We also propose mechanisms to detect emergent photons in
+experiments such as sound attenuation and thermal transport relying on
+spin-lattice coupling in U(1) QSLs.",1802.05280v2
+2019-10-26,Spin-rotation coupling in p-wave Feshbach resonances,"We report evidence for spin-rotation coupling in $p$-wave Feshbach resonances
+in an ultracold mixture of fermionic $^6$Li and bosonic $^{133}$Cs lifting the
+commonly observed degeneracy of states with equal absolute value of
+orbital-angular-momentum projection on the external magnetic field. By
+employing magnetic field dependent atom-loss spectroscopy we find triplet
+structures in $p$-wave resonances. Comparison with coupled-channel
+calculations, including contributions from both spin-spin and spin-rotation
+interactions, yields a spin-rotation coupling parameter
+$|\gamma|=0.566(50)\times10^{-3}$. Our findings highlight the potential of
+Feshbach resonances in revealing subtle molecular couplings and providing
+precise information on electronic and nuclear wavefunctions, especially at
+short internuclear distance. The existence of a non-negligible spin-rotation
+splitting may have consequences for future classifications of $p$-wave
+superfluid phases in spin-polarized fermions.",1910.12011v2
+2003-05-12,Magnetic transition and orbital degrees of freedom in vanadium spinels,"We propose a scenario for the two phase transitions in $A$V$_2$O$_4$ ($A$=Zn,
+Mg, Cd), based on an effective spin-orbital model on the pyrochlore lattice. At
+high temperatures, spin correlations are strongly frustrated due to the lattice
+structure, and the transition at $\sim$50 [K] is an orbital order, supported by
+Jahn-Teller lattice distortion. This orbital order introduces spatial
+modulation of spin exchange couplings depending on the bond direction. This
+partially releases the frustration, and leads to a spin order at $\sim$40 [K].
+We also study the stable spin configuration by taking account of third-neighbor
+exchange couplings and quantum fluctuations. The result is consistent with the
+experimental results.",0305269v1
+2005-11-24,Collective excitation of quantum wires and effect of spin-orbit coupling in the presence of a magnetic field along the wire,"The band structure of a quantum wire with the Rashba spin-orbit coupling
+develops a pseudogap in the presence of a magnetic field along the wire. In
+such a system spin mixing at the Fermi wavevectors $-k_F$ and $k_F$ can be
+different. We have investigated theoretically the collective mode of this
+system, and found that the velocity of this collective excitation depends
+sensitively on the strength of the Rashba spin-orbit interaction and magnetic
+field. Our result suggests that the strength of the spin-orbit interaction can
+be determined from the measurement of the velocity.",0511591v1
+2007-03-08,Quantum Rings with Rashba spin orbit coupling: a path integral approach,"We employ a path integral real time approach to compute the DC conductance
+and spin polarization for electrons transported across a ballistic Quantum Ring
+with Rashba spin-orbit interaction. We use a piecewise semiclassical
+approximation for the particle orbital motion and solve the spin dynamics
+exactly, by accounting for both Zeeman coupling and spin-orbit interaction at
+the same time. Within our approach, we are able to study how the interplay
+between Berry phase, Ahronov Casher phase, Zeeman interaction and weak
+localization corrections influences the quantum interference in the conductance
+within a wide range of externally applied fields. Our results are helpful in
+inerpreting recent measurements on interferometric rings.",0703216v2
+2007-05-31,Insulating state and the importance of the spin-orbit coupling in Ca$_3$CoRhO$_6$,"We have carried out a comparative theoretical study of the electronic
+structure of the novel one-dimensional Ca$_3$CoRhO$_6$ and Ca$_3$FeRhO$_6$
+systems. The insulating antiferromagnetic state for the Ca$_3$FeRhO$_6$ can be
+well explained by band structure calculations with the closed shell high-spin
+$d^5$ (Fe$^{3+}$) and low-spin $t_{2g}^{6}$ (Rh$^{3+}$) configurations. We
+found for the Ca$_3$CoRhO$_6$ that the Co has a strong tendency to be $d^7$
+(Co$^{2+}$) rather than $d^6$ (Co$^{3+}$), and that there is an orbital
+degeneracy in the local Co electronic structure. We argue that it is the
+spin-orbit coupling which will lift this degeneracy thereby enabling local spin
+density approximation + Hubbard U (LSDA+U) band structure calculations to
+generate the band gap. We predict that the orbital contribution to the magnetic
+moment in Ca$_3$CoRhO$_6$ is substantial, i.e. significantly larger than 1
+$\mu_B$ per formula unit. Moreover, we propose a model for the contrasting
+intra-chain magnetism in both materials.",0705.4538v1
+2010-03-17,Spin-orbit coupling and spectral function of interacting electrons in carbon nanotubes,"The electronic spin-orbit coupling in carbon nanotubes is strongly enhanced
+by the curvature of the tube surface and has important effects on the
+single-particle spectrum. Here, we include the full spin-orbit interaction in
+the formulation of the effective low-energy theory for interacting electrons in
+metallic single-wall carbon nanotubes and study its consequences. The resulting
+theory is a four-channel Luttinger liquid, where spin and charge modes are
+mixed. We show that the analytic structure of the spectral function is strongly
+affected by this mixing, which can provide an experimental signature of the
+spin-orbit interaction.",1003.3495v2
+2011-03-11,Signatures of spin-orbit interaction in transport properties of finite carbon nanotubes in a parallel magnetic field,"The transport properties of finite nanotubes placed in a magnetic field
+parallel to their axes are investigated. Upon including spin-orbit coupling and
+curvature effects, two main phenomena are analyzed which crucially depend on
+the tube's chirality: i) Finite carbon nanotubes in a parallel magnetic field
+may present a suppression of current due to the localization at the edges of
+otherwise conducting states. This phenomenon occurs due to the magnetic-field
+dependent open boundary conditions obeyed by the carbon nanotube's wave
+functions. The transport is fully suppressed above threshold values of the
+magnetic field which depend on the nanotube chirality, length and on the
+spin-orbit coupling. ii) Reversible spin polarized currents can be obtained
+upon tuning the magnetic field, exploiting the curvature-induced spin-orbit
+splitting.",1103.2308v1
+2013-05-16,Phonon-drag magnetothermopower in Rashba spin-split two-dimensional electron systems,"We study phonon-drag contribution to the thermoelectric power in a
+quasi-two-dimensional electron system confined in GaAs/AlGaAs heterostructure
+in presence of both Rashba spin-orbit interaction and perpendicular magnetic
+field at very low temperature. It is observed that the peaks in the phonon-drag
+thermopower split into two when the Rashba spin-orbit coupling constant is
+strong. This splitting is a direct consequence of the Rashba spin-orbit
+interaction. We show the dependence of phonon-drag thermopower on both magnetic
+field and temperature numerically. A power-law dependence of phonon-drag
+magnetothermopower on the temperature in the Bloch-Gruneisen regime is found.
+We also extract the exponent of the temperature dependence of phonon-drag
+thermopower for different parameters like electron density, magnetic field, and
+the spin-orbit coupling constant.",1305.3745v2
+2015-03-14,Orbital magnetic phase and pure persistent spin current in spin-orbit coupling mesoscopic rings,"By solving the Rashba model of mesoscopic rings, we give analytically the
+ground-state properties of the ring, including the spin polarization, the
+persistent charge and spin currents (PCC and PSC). These ground-state
+properties can be given based on four kinds of electron numbers in rings. The
+effect of the self-inductance of the ring leads to the self-sustained magnetic
+flux (SSMF) and the self-sustained PCC and PSC, which break spontaneously
+time-reversal symmetry to form orbital magnetic phase (OMP). To tune the
+spin-orbit coupling strength or electron number of the ring can induce the
+phase transition between the OMP and non-OMP. For exact one-dimensional rings
+we find the coexistence of the pure PSC and SSMF. This property of the pure PSC
+may provide a new scheme to measure the pure PSC.",1503.04274v1
+2015-06-20,Analysis of Charge-spin-orbital Fluctuations by Ab Initio Calculation and Random Phase Approximation: Application to Non-coplanar Antiferromagnet Cd2Os2O7,"We present a systematic analysis on the basis of ab initio calculations and
+many-body perturbation theory for clarifying the dominant fluctuation in
+complex charge-spin-orbital coupled systems. For a tight-binding multiband
+model obtained from the maximally-localized Wannier function analysis of the
+band structure by the local density approximation, we take into account
+electron correlations at the level of random phase approximation. To identify
+the dominant fluctuation, we carry out the eigenmode analysis of the
+generalized susceptibility that includes all the multiple degrees of freedom:
+charge, spin, and orbital. We apply this method to the paramagnetic metallic
+phase of a pyrochlore oxide Cd$_2$Os$_2$O$_7$, which shows a metal-insulator
+transition accompanied by a peculiar noncoplanar antiferromagnetic order of
+all-in all-out type. We find that the corresponding spin fluctuation is
+dominantly enhanced by the on-site Coulomb repulsions in the presence of strong
+spin-orbit coupling and trigonal crystal field splitting. Our results indicate
+that the combined method offers an effective tool for the systematic analysis
+of potential instabilities in strongly correlated electron materials.",1506.06231v1
+2017-03-11,Spin-orbit interaction driven dimerization in one dimensional frustrated magnets,"We study the effect of spin-orbit interaction on one-dimensional
+U(1)-invariant frustrated magnets with dominant critical nematic fluctuations.
+The spin-orbit coupling explicitly breaks the U(1) symmetry of arbitrary global
+spin rotations about the high-symmetry axis down to $Z_2$ (invariance under a
+$\pi$-rotation). Given that the nematic order parameter is invariant under a
+$\pi$-rotation, it is relevant to ask if other discrete symmetries can be
+spontaneously broken. Here we demonstrate that the spin-orbit coupling induces
+a bond density wave that spontaneously breaks the translational symmetry and
+opens a gap in the excitation spectrum.",1703.03881v2
+2019-05-17,Spin-orbit coupling: atom versus semiconductor crystal,"We reconsider a key point in semiconductor physics, the splitting of the
+valence band states induced by the spin-orbit interaction, through a novel
+approach which uses neither the group theory formalism, nor the usual
+$\textbf{L}\cdot\textbf{S}$ formulation valid for atoms but conceptually
+incorrect for periodic lattices, the angular momenta $\textbf{L}$ and
+$\textbf{J}$ having no meaning due to the absence of spherical symmetry. We
+show that for zinc-blende structures, the valence band eigenstates resulting
+from spin-orbit coupling are uniquely determined by: (i) the equivalence of the
+($x,y,z$) crystal axes, (ii) the three-fold degeneracy of the valence band. The
+fact that these two conditions are also fulfilled by atomic $p$ states allows
+us to understand why the spin-orbit eigenstates for three-fold atomic and
+valence electrons have exactly the same structure, albeit the drastic
+differences in the potential and electronic symmetries. We also come back to
+the commonly accepted understanding of the exciton-photon interaction in terms
+of bright and dark excitons having total angular momenta $J=(1,2)$ respectively
+and present a simple derivation of this interaction which only relies on spin
+conservation.",1905.07252v1
+2020-07-15,Spin-orbit coupling in single layer ferrimagnets: direct observation of spin-orbit torques and chiral spin textures,"We demonstrate that effects of spin-orbit coupling and inversion asymmetry
+exist in a single GdFeCo ferrimagnetic layer, even without a heavy metal
+interface. We use electric transport measurements to quantify the spin-orbit
+torques. We measure the Dzyaloshinskii-Moriya interaction using Brillouin light
+scattering measurement technique, and we observe the resulting chiral magnetic
+textures using x-ray PEEM microscopy. We attribute these effects to a
+composition variation along the thickness, that we observed by scanning
+transmission electron microscopy. We show that these effects can be optimized
+by varying the GdFeCo thickness or by combining them with interfacial effects.",2007.07569v2
+2016-12-26,Magnetic excitations in a three-orbital model for the strongly spin-orbit coupled iridates: Effect of mixing between the J=1/2 and 3/2 sectors,"A three-orbital-model approach for studying spin wave excitations in the
+strongly spin-orbit coupled layered perovskite iridates is presented which
+provides a unified description of magnetic excitations as well as the
+electronic band structure. The calculated spin wave dispersions with realistic
+three-band parameters are in excellent agreement with the RIXS data for
+iridates, including the strong AF zone boundary dispersion in the single-layer
+compound $\rm Sr_2 Ir O_4$ and the large anisotropy gap in the bilayer compound
+$\rm Sr_3 Ir_2 O_7$. The RIXS spin wave data is shown to provide evidence of
+mixing between the J=1/2 and 3/2 sectors in both compounds.",1612.08360v1
+2020-02-12,Exact results relating spin-orbit interactions in two dimensional strongly correlated systems,"A 2D square, two-bands, strongly correlated and non-integrable system is
+analysed exactly in the presence of many-body spin-orbit interactions via the
+method of Positive Semidefinite Operators. The deduced exact ground states in
+the high concentration limit are strongly entangled, and given by the
+spin-orbit coupling are ferromagnetic and present an enhanced carrier mobility,
+which substantially differs for different spin projections. The described state
+emerges in a restricted parameter space region, which however is clearly
+accessible experimentally. The exact solutions are provided via the solution of
+a matching system of equations containing 74 coupled, non-linear and complex
+algebraic equations. In our knowledge, other exact results for 2D interacting
+systems with spin-orbit interactions are not present in the literature.",2002.05086v1
+2017-09-05,Newton's second law in spin-orbit torque,"Spin-orbit torque (SOT) refers to the excitation of magnetization dynamics
+via spin-orbit coupling under the application of a charged current. In this
+work, we introduce a simple and intuitive description of the SOT in terms of
+spin force. In Rashba spin-orbit coupling system, the damping-like SOT can be
+expressed as ${\mathbf T}^\mathrm{so}={\mathbf R}_c\times {\mathbf F}^{{\mathrm
+{so}}}$, in analogy to the classical torque-force relation, where $R_c$ is the
+effective radius characterizing the Rashba splitting in the momentum space. As
+a consequence, the magnetic energy is transferred to the conduction electrons,
+which dissipates through Joule heating at a rate of $({\mathbf j}_e\cdot
+{\mathbf F}^{\mathrm {so}})$, with $j_e$ being the applied current. Finally, we
+propose an experimental verification of our findings via measurement of the
+anisotropic magnetoresistance effect.",1709.01302v2
+2020-11-13,"Magnetic field-induced ""mirage"" gap in an Ising superconductor","Superconductivity is commonly destroyed by a magnetic field due to orbital or
+Zeeman-induced pair breaking. Surprisingly, the spin-valley locking in a
+two-dimensional superconductor with spin-orbit interaction makes the
+superconducting state resilient to large magnetic fields. We investigate the
+spectral properties of such an Ising superconductor in a magnetic field taking
+into account disorder. The interplay of the in-plane magnetic field and the
+Ising spin-orbit coupling leads to noncollinear effective fields. We find that
+the emerging singlet and triplet pairing correlations manifest themselves in
+the occurrence of ""mirage"" gaps: at (high) energies of the order of the
+spin-orbit coupling strength, a gap-like structure in the spectrum emerges that
+mirrors the main superconducting gap. We show that these mirage gaps are
+signatures of the equal-spin triplet finite-energy pairing correlations and due
+to their odd parity are sensitive to intervalley scattering.",2011.07080v2
+2021-11-15,First-principles calculations of spin-orbit torques in Mn$_2$Au/heavy-metal bilayers,"Using the non-equilibrium Green's function technique, we calculate spin-orbit
+torques in a Mn$_2$Au/heavy-metal bilayer, where the heavy metal (HM) is W or
+Pt. Spin-orbit coupling (SOC) in the bulk of Mn$_2$Au generates strong
+fieldlike torquance, which is parallel on the two sublattices and scales
+linearly with the conductivity, and a weaker dampinglike torquance that is
+antiparallel on the two sublattices. Interfaces with W or Pt generate parallel
+dampinglike torques of opposite signs that are similar in magnitude to those in
+ferromagnetic bilayers and similarly insensitive to disorder. The dampinglike
+torque efficiency depends strongly on the termination of the interface and on
+the presence of spin-orbit coupling in Mn$_2$Au, suggesting that the
+dampinglike torque is not due solely to the spin-Hall effect in the HM layer.
+Interfaces also induce antiparallel fieldlike and dampinglike torques that can
+penetrate deep into Mn$_2$Au.",2111.07532v2
+2023-01-04,Covariant orbital-spin scheme for any spin based on irreducible tensor,"In hadron spectrum physics, the partial wave analysis is a primary method
+used to extract properties of hadronic resonances. The covariant orbital-spin
+coupling scheme holds unique advantages over other partial wave methods due to
+its Lorentz covariant form and determined orbital-spin quantum numbers. This
+paper presents a general form of the covariant orbital-spin coupling scheme
+based on the irreducible tensor of the homogeneous proper Lorentz group and its
+little groups. A systematic procedure for constructing partial wave amplitude
+in a Lorentz covariant way is provided, which can be applied to both massive
+and massless particles. Specific examples are also included.",2301.01575v3
+2012-04-20,Strong coupling of a spin qubit to a superconducting stripline cavity,"We study electron-spin-photon coupling in a single-spin double quantum dot
+embedded in a superconducting stripline cavity. With an external magnetic
+field, we show that either a spin-orbit interaction (for InAs) or an
+inhomogeneous magnetic field (for Si and GaAs) could produce a strong
+spin-photon coupling, with a coupling strength of the order of 1 MHz. With an
+isotopically purified Si double dot, which has a very long spin coherence time
+for the electron, it is possible to reach the strong-coupling limit between the
+spin and the cavity photon, as in cavity quantum electrodynamics. The coupling
+strength and relaxation rates are calculated based on parameters of existing
+devices, making this proposal experimentally feasible.",1204.4732v2
+2022-04-01,Tunable hole spin-photon interaction based on g-matrix modulation,"We consider a spin circuit-QED device where a superconducting microwave
+resonator is capacitively coupled to a single hole confined in a semiconductor
+quantum dot. Thanks to the strong spin-orbit coupling intrinsic to valence-band
+states, the gyromagnetic g-matrix of the hole can be modulated electrically.
+This modulation couples the photons in the resonator to the hole spin. We show
+that the applied gate voltages and the magnetic-field orientation enable a
+versatile control of the spin-photon interaction, whose character can be
+switched from fully transverse to fully longitudinal. The longitudinal coupling
+is actually maximal when the transverse one vanishes and vice-versa. This
+""reciprocal sweetness"" results from geometrical properties of the g-matrix and
+protects the spin against dephasing or relaxation. We estimate coupling rates
+reaching ~ 10 MHz in realistic settings and discuss potential circuit-QED
+applications harnessing either the transverse or the longitudinal spin-photon
+interaction. Furthermore, we demonstrate that the g-matrix curvature can be
+used to achieve parametric longitudinal coupling with enhanced coherence.",2204.00404v3
+2017-12-27,The simple-cubic structure of elemental Polonium and its relation to combined charge and orbital order in other elemental chalcogens,"Polonium is the only element to crystallise into a simple cubic structure at
+ambient conditions. Moreover, at high temperatures it undergoes a structural
+phase transition into a less symmetric trigonal configuration. It has long been
+suspected that the strong spin-orbit coupling in Polonium is involved in both
+peculiarities, but the precise mechanism by which it operates remains
+controversial. Here, we introduce a single microscopic model capable of
+capturing the atomic structure of all chalcogen crystals: Selenium, Tellurium,
+and Polonium. We show that the strong spin-orbit coupling in Polonium
+suppresses the trigonal charge and orbital ordered state known to be the ground
+state configuration of Selenium and Tellurium, and allows the simple cubic
+state to prevail instead. We also confirm a recent suggestion based on ab
+initio calculations that a small increase in the lattice constant may
+effectively decrease the role of spin-orbit coupling, leading to a re-emergence
+of the trigonal orbital ordered state at high temperatures. We conclude that
+Polonium is a unique element, in which spins, orbitals, electronic charges, and
+lattice deformations all cooperate and collectively cause the emergence of the
+only elemental crystal structure with the simplest possible, cubic, lattice.",1712.09533v3
+2016-07-10,Classification of multipole superconductivity in multi-orbital systems and its implications,"Motivated by a growing interest in multi-orbital superconductors with
+spin-orbit interactions, we perform the group-theoretical classification of
+various unconventional superconductivity emerging in symmorphic $\rm O$, $\rm
+D_4$, and $\rm D_6$ space groups. The generalized Cooper pairs, which we here
+call ""multipole"" superconductivity, possess spin-orbital coupled (multipole)
+degrees of freedom, instead of the conventional spin singlet/triplet in
+single-orbital systems. From the classification, we obtain the following key
+consequences, which have been overlooked in the long history of research in
+this field: (1) A superconducting gap function with
+$\varGamma_9\otimes\varGamma_9$ in $\rm D_6$ possesses nontrivial momentum
+dependence, different from the usual spin 1/2 classification. (2)
+Unconventional gap structure can be realized in the BCS approximation of purely
+local (on-site) interactions irrespective of attractive/repulsive. It implies
+the emergence of an electron-phonon (e-ph) driven unconventional
+superconductivity. (3) Reflecting symmetry of orbital basis functions, there
+appear not symmetry-protected but inevitable line nodes/gap minima, and thus,
+anisotropic $s$-wave superconductivity can be naturally explained without any
+competitive fluctuations.",1607.02716v1
+2013-08-05,Spin and Orbital Contributions to Magnetically Ordered Moments in 5d Layered Perovskite Sr2IrO4,"The ratio of orbital (L) and spin (S) contributions to the magnetically
+ordered moments of a 5d transition metal oxide, Sr2IrO4 was evaluated by
+non-resonant magnetic x-ray diffraction. We applied a new experimental setting
+to minimize the error in which we varied only the linear-polarization of
+incident x-ray at a fixed scattering angle. Strong polarization dependence of
+the intensity of magnetic diffraction was observed, from which we conclude that
+the ordered moments contain substantial contribution from the orbital degree of
+freedom with the ratio of <L>/<S> ~5.0, evidencing the pronounce effect of
+spin-orbit coupling. The obtained ratio is close to but slightly larger than
+the expected value for the ideal J_eff = 1/2 moment of a spin-orbital Mott
+insulator, |<J_1/2|L_z|J_1/2>|/|<J_1/2|S_z|J_1/2>| = 4, which cannot be
+accounted by the redistribution of orbital components within the t_2g bands
+associated with the elongation of the IrO6 octahedra.",1308.0923v1
+2019-10-08,Orbital Nernst Effect of Magnons,"In the past, magnons have been shown to mediate thermal transport of spin in
+various systems. Here, we reveal that the fundamental coupling of scalar spin
+chirality, inherent to magnons, to the electronic degrees of freedom in the
+system can result in the generation of sizeable orbital magnetization and
+thermal transport of orbital angular momentum. We demonstrate the emergence of
+the latter phenomenon of orbital Nernst effect by referring to the spin-wave
+Hamiltonian of kagome ferromagnets, predicting that in a wide range of systems
+the transverse current of orbital angular momentum carried by magnons in
+response to an applied temperature gradient can overshadow the accompanying
+spin current. We suggest that the discovered effect fundamentally correlates
+with the topological Hall effect of fluctuating magnets, and it can be utilized
+in magnonic devices for generating magnonic orbital torques.",1910.03317v2
+2003-05-19,Manipulation of spin dephasing in InAs quantum wires,"The spin dephasing due to the Rashba spin-orbit coupling, especially its
+dependence on the direction of the electric field is studied in InAs quantum
+wire. We find that the spin dephasing is strongly affected by the angle of
+Rashba effective magnetic field and the applied magnetic field. The
+nonlinearity in spin dephasing time versus the direction of the electric field
+shows a potential evenue to manipulate the spin lifetime in spintronic device.
+Moreover, we figure out a quantity that can well represent the inhomogeneous
+broadening of the system which may help us to understand the many-body spin
+dephasing due to the Rashba effect.",0305429v1
+2003-10-06,Tunneling spin-galvanic effect,"It has been shown that tunneling of spin-polarized electrons through a
+semiconductor barrier is accompanied by generation of an electric current in
+the plane of the interfaces. The direction of this interface current is
+determined by the spin orientation of the electrons, in particular the current
+changes its direction if the spin orientation changes the sign. Microscopic
+origin of such a 'tunneling spin-galvanic' effect is the spin-orbit
+coupling-induced dependence of the barrier transparency on the spin orientation
+and the wavevector of electrons.",0310111v1
+2005-03-08,Spin relaxation and decoherence of holes in quantum dots,"We investigate heavy-hole spin relaxation and decoherence in quantum dots in
+perpendicular magnetic fields. We show that at low temperatures the spin
+decoherence time is two times longer than the spin relaxation time. We find
+that the spin relaxation time for heavy holes can be comparable to or even
+longer than that for electrons in strongly two-dimensional quantum dots. We
+discuss the difference in the magnetic-field dependence of the spin relaxation
+rate due to Rashba or Dresselhaus spin-orbit coupling for systems with positive
+(i.e., GaAs quantum dots) or negative (i.e., InAs quantum dots) $g$-factor.",0503181v1
+2005-12-16,Spin dynamics in a compound semiconductor spintronic structure with a Schottky barrier,"We demonstrate theoretically that spin dynamics of electrons injected into a
+GaAs semiconductor structure through a Schottky barrier possesses strong
+non-equilibrium features. Electrons injected are redistributed quickly among
+several valleys. Spin relaxation driven by the spin-orbital coupling in the
+semiconductor is very rapid. At T = 4.2 K, injected spin polarization decays on
+a distance of the order of 50 - 100 nm from the interface. This spin
+penetration depth reduces approximately by half at room temperature. The spin
+scattering length is different for different valleys.",0512414v1
+2006-02-17,Spin orientation of a two-dimensional electron gas by a high-frequency electric field,"Coupling of spin states and space motion of conduction electrons due to
+spin-orbit interaction opens up possibilities for manipulation of the electron
+spins by electrical means. It is shown here that spin orientation of a
+two-dimensional electron gas can be achieved by excitation of the carriers with
+a linearly polarized high-frequency electric field. In (001)-grown quantum well
+structures excitation with in-plane ac electric field induces orientation of
+the electron spins along the quantum well normal, with the spin sign and the
+magnitude depending on the field polarization.",0602410v1
+2006-10-03,Non-diffusive spin dynamics in a two-dimensional electron gas,"We describe measurements of spin dynamics in the two-dimensional electron gas
+in GaAs/GaAlAs quantum wells. Optical techniques, including transient
+spin-grating spectroscopy, are used to probe the relaxation rates of spin
+polarization waves in the wavevector range from zero to $6\times 10^4$
+cm$^{-1}$. We find that the spin polarization lifetime is maximal at nonzero
+wavevector, in contrast with expectation based on ordinary spin diffusion, but
+in quantitative agreement with recent theories that treat diffusion in the
+presence of spin-orbit coupling.",0610054v1
+2011-03-04,Spin-triplet supercurrent carried by quantum Hall edge states through a Josephson junction,"We show that a spin-polarized Landau level in a two-dimensional electron gas
+can carry a spin-triplet supercurrent between two spin-singlet superconductors.
+The supercurrent results from the interplay of Andreev reflection and Rashba
+spin-orbit coupling at the normal--superconductor (NS) interface. We contrast
+the current-phase relationship and the Fraunhofer oscillations of the
+spin-triplet and spin-singlet Josephson effect in the lowest Landau level, and
+find qualitative differences.",1103.0887v1
+2018-06-19,Spin-active devices based on graphene / WSe$_2$ heterostructure,"We consider graphene on monolayer WSe$_2$ and the spin-orbit coupling induced
+by the transition-metal dichalcogenide substrate for application to spin-active
+devices. We study quantum dots and graphene quantum rings as tunable spin
+filters and inverters. We use an atomistic tight-binding model as well as the
+Dirac equation to determine stationary states confined in quantum dots and
+rings. Next we solve the spin-transport problem for dots and rings connected to
+nanoribbon leads. The systems connected to zigzag nanoribbons at low magnetic
+fields act as spin filters and provide strongly spin polarized current.",1806.07068v1
+2005-03-29,Spin-Forster transfer in optically excited quantum dots,"The mechanisms of energy and spin transfer in quantum dot pairs coupled via
+the Coulomb interaction are studied. Exciton transfer can be resonant or
+phonon-assisted. In both cases, the transfer rates strongly depend on the
+resonance conditions. The spin selection rules in the transfer process come
+from the exchange and spin-orbit interactions. The character of energy
+dissipation in spin transfer is different than that in the traditional spin
+currents. The spin-dependent photon cross-correlation functions reflect the
+exciton transfer process. In addition, a mathematical method to calculate
+F\""orster transfer in crystalline nanostructures beyond the dipole-dipole
+approximation is described.",0503688v1
+2005-10-13,Quantum Spin Current Induced Through Optical Fields,"We propose a scheme to generate quantum spin current via optical dipole
+transition process. By coupling a three-level system based on the spin states
+of charged particles (electrons or holes in semiconductor) to the angular
+momentum states of the radiation, we show that a pure quantum spin current can
+be generated. No spin-orbit interaction is needed in this scheme. We also
+calculate the effect of nonmagnetic impurities on the created spin currents and
+show that the vertex correction of the spin hall conductivity in the ladder
+approximation is exactly zero.",0510334v2
+2006-07-06,Mesoscopic Hall effect driven by chiral spin order,"A Hall effect due to spin chirality in mesoscopic systems is predicted. We
+consider a 4-terminal Hall system including local spins with geometry of a
+vortex domain wall, where strong spin chirality appears near the center of
+vortex. The Fermi energy of the conduction electrons is assumed to be
+comparable to the exchange coupling energy where the adiabatic approximation
+ceases to be valid. Our results show a Hall effect where a voltage drop and a
+spin current arise in the transverse direction. The similarity between this
+Hall effect and the conventional spin Hall effect in systems with spin-orbit
+interaction is pointed out.",0607159v1
+2011-03-30,Theory of spin noise in nanowires,"We develop a theory of spin noise in semiconductor nanowires considered as
+prospective elements for spintronics. In these structures spin-orbit coupling
+can be realized as a random function of coordinate correlated on the spatial
+scale of the order of 10 nm. By analyzing different regimes of electron
+transport and spin dynamics, we demonstrate that the spin relaxation can be
+very slow and the resulting noise power spectrum increases algebraically as
+frequency goes to zero. This effect makes spin effects in nanowires best
+suitable for studies by rapidly developing spin-noise spectroscopy.",1103.6040v2
+2023-12-22,Tunneling spin Nernst effect for a single quantum dot,"We describe theoretically the spin Nernst effect for electrons tunneling to a
+quantum dot from a quantum wire with the heat flowing along it. Such a
+tunneling spin Nernst effect is shown to take place due to the spin-dependent
+electron tunneling produced by the spin-orbit coupling. The Coulomb interaction
+of electrons in the quantum dot is taken into account using nonequilibrium
+Green's functions and is shown to increase significantly the accumulated spin
+in a single quantum dot. The difference of the temperatures as small as tenth
+of Kelvin applied to the ends of the quantum wire can lead to the spin
+polarization as large as tens of percent.",2312.14700v1
+2018-09-02,Nodal topology in $d$-wave superconducting monolayer FeSe,"A nodeless $d$-wave state is likely in superconducting monolayer FeSe on
+SrTiO$_3$. The lack of nodes is surprising but has been shown to be a natural
+consequence of the observed small interband spin-orbit coupling. Here we
+examine the evolution from a nodeless state to the nodal state as this
+spin-orbit coupling is increased from a topological perspective. We show that
+this evolution depends strongly on the orbital content of the superconducting
+degrees of freedom. In particular, there are two $d$-wave solutions, which we
+call orbitally trivial and orbitally nontrivial. In both cases, the nodes carry
+a $\pm 2$ topological winding number that originates from a chiral symmetry.
+However, the momentum space distribution of the positive and negative charges
+is different for the two cases, resulting in a different evolution of these
+nodes as they annihilate to form a nodeless superconductor. We further show
+that the orbitally trivial and orbitally nontrivial nodal states exhibit
+different Andreev flat band spectra at the edge.",1809.00334v2
+2018-01-30,Controlled spatial separation of spins and coherent dynamics in spin-orbit-coupled nanostructures,"The spatial separation of electron spins followed by the control of their
+individual spin dynamics has recently emerged as an essential ingredient in
+many proposals for spin-based technologies because it would enable both of the
+two spin species to be simultaneously utilized, distinct from most of the
+current spintronic studies and technologies wherein only one spin species could
+be handled at a time. Here we demonstrate that the spatial spin splitting of a
+coherent beam of electrons can be achieved and controlled using the interplay
+between an external magnetic field and Rashba spin-orbit interaction in
+semiconductor nanostructures. The technique of transverse magnetic focusing is
+used to detect this spin separation. More notably, our ability to engineer the
+spin-orbit interactions enables us to simultaneously manipulate and probe the
+coherent spin dynamics of both spin species and hence their correlation, which
+could open a route towards spintronics and spin-based quantum information
+processing.",1801.10148v1
+2005-07-20,Astrophysical Unipolar Inductors Powered by Gravitational Wave Emission,"We consider the Unipolar Inductor Model (Goldreich & Lynden-Bell 1969)
+applied to Double Degenerate Binaries (DDBs) with ultrashort periods (Wu et al.
+2002). In this model a magnetized primary white dwarf has a slight asynchronism
+between its spin and orbital motion, so that the (non-magnetic) secondary
+experiences a motional electric field when moving through the primary field
+lines. This induces a current flow between the two stars and provides an
+electric spin-orbit coupling mechanism for the primary. We study the combined
+effect of Gravitational Wave emission and electric spin-orbit coupling on the
+evolution of the primary degree of asynchronism and the associated rate of
+electric current dissipation in such systems, assuming that the primary's spin
+is not affected by any other mechanisms. In particular, we show that in
+ultrashort period binaries the emission of GW pumps energy in the electric
+circuit as to keep it steadily active. This happens despite the fact that
+spin-orbit coupling can rapidly synchronize the primary, because GW represent a
+slow desynchronizing mechanism steadily substracting orbital angular momentum
+to the system. A slightly asynchronous steady-state is thus achieved,
+determined by the balance between these two competing effects. This can be
+shown to correspond to a condition where the total available electric energy is
+conserved, because of GW emission, while dissipation, synchronization and
+orbital shrinking continue.",0507474v1
+2013-10-29,Wave packet dynamics and zitterbewegung of heavy holes in a quantizing magnetic field,"In this work we study wave packet dynamics and $zitterbewegung$, an
+oscillatory quantum motion, of heavy holes in III-V semiconductor quantum wells
+in presence of a quantizing magnetic field. It is revealed that a Gaussian
+wave-packet describing a heavy hole diffuses asymmetrically along the circular
+orbit while performing cyclotron motion. The wave packet splits into two peaks
+with unequal amplitudes after a certain time depending on spin-orbit coupling
+constant. This unequal splitting of the wave packet is attributed to the cubic
+Rashba interaction for heavy holes. The difference in the peak amplitudes
+disappears with time. At a certain time the two peaks diffuse almost along the
+entire cyclotron orbit. Then tail and head of the diffused wave packet
+interfere and as a result a completely randomized pattern of the wave packet is
+observed. The diffusion rate of the wave packet increases with increase of the
+spin-orbit interaction strength. Also strong spin-orbit coupling expedite the
+splitting and the randomization of the wave packet. We also study the
+$zitterbewegung$ in various physical observables such as position, charge
+current and spin angular momentum of the heavy hole. The $zitterbewegung$
+oscillations are very much sensitive to the initial wave vector of the Gaussian
+wave packet and the strength of the Rashba spin-orbit coupling.",1310.7749v2
+2020-01-06,Highly efficient spin orbit torque in Pt/Co/Ir multilayers with antiferromagnetic interlayer exchange coupling,"We have studied the spin orbit torque (SOT) in Pt/Co/Ir multilayers with 3
+repeats of the unit structure. As the system exhibits oscillatory interlayer
+exchange coupling (IEC) with varying Ir layer thickness, we compare the SOT of
+films when the Co layers are coupled ferromagnetically and
+antiferromagnetically. SOT is evaluated using current induced shift of the
+anomalous Hall resistance hysteresis loops. A relatively thick Pt layer,
+serving as a seed layer to the multilayer, is used to generate spin current via
+the spin Hall effect. In the absence of antiferromagnetic coupling, the SOT is
+constant against the applied current density and the corresponding spin torque
+efficiency (i.e. the effective spin Hall angle) is $\sim$0.09, in agreement
+with previous reports. In contrast, for films with antiferromagnetic coupling,
+the SOT increases with the applied current density and eventually saturates.
+The SOT at saturation is a factor of $\sim$15 larger than that without the
+antiferromagnetic coupling. The spin torque efficiency is $\sim$5 times larger
+if we assume the net total magnetization is reduced by a factor of 3 due to the
+antiferromagnetic coupling. Model calculations based on the Landau Lifshitz
+Gilbert equation show that the presence of antiferromagnetic coupling can
+increase the SOT but the degree of enhancement is limited, in this case, to a
+factor of 1.2-1.4. We thus consider there are other sources of SOT, possibly at
+the interfaces, which may account for the highly efficient SOT in the
+uncompensated synthetic anti-ferromagnet (SAF) multilayers.",2001.01454v1
+2020-02-06,"Effects of transition-metal spacers on the spin-orbit torques, spin Hall magnetoresistance, and magnetic anisotropy of Pt/Co bilayers","We studied the effect of inserting 0.5 nm-thick spacer layers (Ti, V, Cr, Mo,
+W) at the Pt/Co interface on the spin-orbit torques, Hall effect,
+magnetoresistance, saturation magnetization, and magnetic anisotropy. We find
+that the damping-like spin-orbit torque decreases substantially for all samples
+with a spacer layer compared to the reference Pt/Co bilayer, consistently with
+the opposite sign of the atomic spin-orbit coupling constant of the spacer
+elements relative to Pt. The reduction of the damping-like torque is monotonic
+with atomic number for the isoelectronic 3d, 4d, and 5d elements, with the
+exception of V that has a stronger effect than Cr. The field-like spin-orbit
+torque almost vanishes for all spacer layers irrespective of their composition,
+suggesting that this torque predominantly originates at the Pt/Co interface.
+The anomalous Hall effect, magnetoresistance, and saturation magnetization are
+also all reduced substantially, whereas the sheet resistance is increased in
+the presence of the spacer layer. Finally, we evidence a correlation between
+the amplitude of the spin-orbit torques, the spin Hall-like magnetoresistance,
+and the perpendicular magnetic anisotropy. These results highlight the
+significant influence of ultrathin spacer layers on the magnetotransport
+properties of heavy metal/ferromagnetic systems.",2002.02162v1
+2015-09-14,Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling,"The magnon disp ersion in Ca2RuO4 has been determined by inelastic neutron
+scattering on single crytals containing 1% of Ti. The dispersion is well
+described by a conventional Heisenberg model suggesting a local moment model
+with nearest neighbor interaction of J=8 meV. Nearest and next-nearest neighbor
+interaction as well as inter-layer coupling parameters are required to properly
+describe the entire dispersion. Spin-orbit coupling induces a very large
+anisotropy gap in the magnetic excitations in apparent contrast with a simple
+planar magnetic model. Orbital ordering breaking tetragonal symmetry, and
+strong spin-orbit coupling can thus be identified as important factors in this
+system.",1509.03999v2
+2018-04-01,Resonance states near a quantum magnetic impurity in single-layer FeSe superconductors with $d$-wave symmetry,"In this work, we investigate the local density of states (LDOS) near a
+magnetic impurity in single-layer FeSe superconductors. The two-orbital model
+with spin-orbit coupling proposed in Ref. [{\emph{Phys. Rev. Lett.}
+\textbf{119}, 267001 (2017)}] is used to describe the FeSe superconductor. In
+the strong coupling regime, two impurity resonance peaks appear with opposite
+resonance energies in the LDOS spectral function. For a strong spin-orbit
+coupling, the superconducting gap in this model is $d$-wave symmetric with
+nodes, the spatial distributions of the LDOS at the two resonance energies are
+fourfold symmetric, which reveals typical characteristic of $d$-wave pairing.
+When the spin-orbit coupling is not strong enough to close the superconducting
+gap, we find that the spatial distribution of the LDOS at one of the resonance
+energies manifests $s$-wave symmetry, while the pairing potential preserves
+$d$-wave symmetry. This result is consistent with previous experimental
+investigations.",1804.00258v1
+2019-07-25,Alleviating the Sign Problem in Quantum Monte Carlo Simulations of Spin-Orbit-Coupled Multi-Orbital Hubbard Models,"We present a strategy to alleviate the sign problem in continuous-time
+quantum Monte Carlo (CTQMC) simulations of the dynamical-mean-field-theory
+(DMFT) equations for the spin-orbit-coupled multiorbital Hubbard model. We
+first identify the combinations of rotationally invariant Hund coupling terms
+present in the relativistic basis which lead to a severe sign problem.
+Exploiting the fact that the average sign in CTQMC depends on the choice of
+single-particle basis, we propose a bonding-antibonding basis
+$V_{j3/2\mathrm{BA}}$ which shows an improved average sign compared to the
+widely used relativistic basis for most parameter sets investigated. We then
+generalize this procedure by introducing a stochastic optimization algorithm
+that exploits the space of single-particle bases and show that
+$V_{j3/2\mathrm{BA}}$ is very close to optimal within the parameter space
+investigated. Our findings enable more efficient DMFT simulations of materials
+with strong spin-orbit coupling.",1907.11298v2
+2019-01-30,Thermal transitions of the modulated superfluid for spin-orbit coupled correlated bosons in an optical lattice,"We investigate the thermal physics of a Bose-Hubbard model with Rashba
+spin-orbit coupling starting from a strong coupling mean-field ground state.
+The essential role of the spin-orbit coupling $\left(\gamma\right)$ is to
+promote condensation of the bosons at a finite wavevector ${k}_{0}$. We find
+that the bosons display either homogeneous or phase-twisted or orbital ordered
+superfluid phases, depending on $\gamma$ and the inter-species interaction
+strength $\lambda$. We show that an increase of $\gamma$ leads to suppression
+of the critical interaction $U_c$ for the superfluid to Mott insulator
+transition in the ground state, and a reduction of the $T_c$ for superfluid to
+Bose-liquid transition at a fixed interaction. We capture the thermal
+broadening in the momentum distribution function, and the real space profiles
+of the thermally disordered magnetic textures, including their homogenization
+for $T \gtrsim T_{c}$. We provide a Landau theory based description of the
+ground state phase boundaries and thermal transition scales, and discuss
+experiments which can test our theory.",1901.10672v1
+2017-04-02,Pseudospin Hall effect of light in photonic crystals with Weyl points,"The study of spin-orbit coupling of photons has attracted much attention in
+recent years, and leads to many potential applications in optics. In the
+recently discovered metamaterial -- photonic crystals with Weyl points, the
+pseudospin-orbit coupling of photons bears a resemblance to the spin-orbit
+coupling. We study the pseudospin Hall effect of light in such metamaterials
+and find that during total reflection, the light beam experiences a transverse
+shift that is proportional to the pseudospin (or the monopole charge) of the
+Weyl point. As the spin Hall effect has inspired many works to explore the
+applications in optics, exploring the coupling between the orbital and
+pseudospin degrees of freedom of photons can also be fruitful in the field of
+optics, as well as in other fields where Weyl points can be realized.",1704.00305v1
+2000-01-03,Spin-Orbit Couplings in X-ray Binaries,"We discuss the influence of tidal spin-orbit interactions on the orbital
+dynamics of close intermediate-mass X-ray binaries. In particular we consider
+here a process in which spin angular momentum of a contracting RLO donor star,
+in a synchronous orbit, is converted into orbital angular momentum and thus
+helps to stabilize the mass transfer by widening the orbit. Binaries which
+would otherwise suffer from dynamically unstable mass transfer (leading to the
+formation of a common envelope and spiral-in evolution) are thus shown to
+survive a phase of extreme mass transfer on a sub-thermal timescale.
+Furthermore, we discuss the orbital evolution prior to RLO in X-ray binaries
+with low-mass donors, caused by the competing effects of wind mass loss and
+tidal effects due to expansion of the (sub)giant.",0001014v1
+1999-04-20,Birth of resonances in the spin-orbit problem of Celestial Mechanics,"The behaviour of resonances in the spin-orbit coupling in Celestial Mechanics
+is investigated. We introduce a Hamiltonian nearly-integrable model describing
+an approximation of the spin-orbit interaction. A parametric representation of
+periodic orbits is presented. We provide explicit formulae to compute the
+Taylor series expansion in the perturbing parameter of the function describing
+this parametrization. Then we compute approximately the radius of convergence
+providing an indication of the stability of the periodic orbit. This quantity
+is used to describe the different probabilities of capture into resonance. In
+particular, we notice that for low values of the orbital eccentricity the only
+significative resonance is the synchronous one. Higher order resonances
+(including 1:2, 3:2, 2:1) appear only as the orbital eccentricity is increased.",9904035v1
+2011-03-12,Orbital multicriticality in spin gapped quasi-1D antiferromagnets,"Motivated by the quasi-1D antiferromagnet CaV$_2$O$_4$, we explore
+spin-orbital systems in which the spin modes are gapped but orbitals are near a
+macroscopically degenerate classical transition. Within a simplified model we
+show that gapless orbital liquid phases possessing power-law correlations may
+occur without the strict condition of a continuous orbital symmetry. For the
+model proposed for CaV$_2$O$_4$, we find that an orbital phase with coexisting
+order parameters emerges from a multicritical point. The effective orbital
+model consists of zigzag-coupled transverse field Ising chains. The
+corresponding global phase diagram is constructed using field theory methods
+and analyzed near the multicritical point with the aid of an exact solution of
+a zigzag XXZ model.",1103.2473v2
+2011-04-10,Interplay of orbital and spin ordering in the iron pnictides,"A number of recent experiments exhibit electronic anisotropy in the iron
+pnictides, and there is a growing body of experimental evidence that its origin
+is related to orbital ordering in Fe d_{xz} and d_{yz} orbitals. We examine
+this problem in the parent compounds of the iron pnictides by a combination of
+ab initio band theory calculations, phenomenological Ginzburg-Landau theory of
+coupled orbital and magnetic order parameters, and a microscopic mean-field
+study of the Kugel-Khomskii model. We find that orbital ordering is sufficient
+to explain a number of key experimental observations, in particular a linear
+correlation between the orthorhombic lattice distortion and the magnetic
+ordered moment. We predict that orbital polarization should scale as a square
+of magnetic moment close to T_N. Mediated by orbital polarization, the
+effective spin-spin exchange interactions develop anisotropy in the ab-plane,
+in accord with recent neutron scattering measurements.",1104.1747v1
+2016-05-21,"Spin-Orbit-Induced Spin, Charge, and Energy Transport in Diffusive Superconductors","We consider the spin-orbit-induced spin Hall effect and spin swapping in
+diffusive superconductors. By employing the non-equilibrium Keldysh Green's
+function technique in the quasiclassical approximation, we derive coupled
+transport equations for the spectral spin and particle distributions and for
+the energy density in the elastic scattering regime. We compute four
+contributions to the spin Hall conductivity, namely, skew scattering,
+side-jump, anomalous velocity, and the Yafet contribution. The reduced density
+of states in the superconductor causes a renormalization of the spin Hall
+angle. We demonstrate that all four of these contributions to the spin Hall
+conductivity are renormalized in the same way in the superconducting state. In
+its simplest manifestation, spin swapping transforms a primary spin current
+into a secondary spin current with swapped current and polarization directions.
+We find that the spin-swapping coefficient is not explicitly but only
+implicitly affected by superconducting correlations through the renormalized
+diffusion coefficients. We discuss experimental consequences for measurements
+of the (inverse) spin Hall effect and spin swapping in four-terminal
+geometries. In our geometry, below the superconducting transition temperature,
+the spin-swapping signal is increased an order of magnitude while changes in
+the (inverse) spin Hall signal are moderate.",1605.06611v2
+2020-02-26,Spin-orbit quantum impurity in a topological kagome magnet,"Quantum states induced by single-atomic-impurities are the current frontier
+of material and information science. Recently the spin-orbit coupled correlated
+kagome magnets are emerging as a new class of topological quantum materials,
+although the effect of single-atomic impurities remains unexplored. Here we use
+state-of-the-art scanning tunneling microscopy/spectroscopy (STM/S) to study
+the atomic indium impurity in a topological kagome magnet Co3Sn2S2, which is
+designed to support the spin-orbit quantum state. We find each impurity
+features a strongly localized bound state. Our systematic
+magnetization-polarized tunneling probe reveals its spin-down polarized nature
+with an unusual moment of -5uB, indicative of additional orbital magnetization.
+As the separation between two impurities progressively shrinks, their
+respective bound states interact and form quantized molecular orbital states.
+The molecular orbital of three neighboring impurities further exhibits an
+intriguing splitting owing to the combination of geometry, magnetism, and
+spin-orbit coupling, analogous to the splitting of the topological Weyl fermion
+line12,19. Our work demonstrates the quantum-level interplay between magnetism
+and spin-orbit coupling at an individual atomic impurity, which provides
+insights into the emergent impurity behavior in a topological kagome magnet and
+the potential of spin-orbit quantum impurities for information science.",2002.11783v1
+2014-03-03,The honeycomb lattice with multi-orbital structure: topological and quantum anomalous Hall insulators with large gaps,"We construct a minimal four-band model for the two-dimensional (2D)
+topological insulators and quantum anomalous Hall insulators based on the
+$p_x$- and $p_y$-orbital bands in the honeycomb lattice. The multiorbital
+structure allows the atomic spin-orbit coupling which lifts the degeneracy
+between two sets of on-site Kramers doublets $j_z=\pm\frac{3}{2}$ and
+$j_z=\pm\frac{1}{2}$. Because of the orbital angular momentum structure of
+Bloch-wave states at $\Gamma$ and $K(K^\prime)$ points, topological gaps are
+equal to the atomic spin-orbit coupling strengths, which are much larger than
+those based on the mechanism of the $s$-$p$ band inversion. In the weak and
+intermediate regime of spin-orbit coupling strength, topological gaps are the
+global gap. The energy spectra and eigen wave functions are solved analytically
+based on Clifford algebra. The competition among spin-orbit coupling $\lambda$,
+sublattice asymmetry $m$ and the N\'eel exchange field $n$ results in band
+crossings at $\Gamma$ and $K (K^\prime)$ points, which leads to various
+topological band structure transitions. The quantum anomalous Hall state is
+reached under the condition that three gap parameters $\lambda$, $m$, and $n$
+satisfy the triangle inequality. Flat bands also naturally arise which allow a
+local construction of eigenstates. The above mechanism is related to several
+classes of solid state semiconducting materials.",1403.0563v6
+2017-11-07,Mixing of $t_{2g}$-$e_g$ orbitals in 4d and 5d transition metal oxides,"Using exact diagonalization, we study the spin-orbit coupling and
+interaction-induced mixing between $t_{2g}$ and $e_g$ $d$-orbital states in a
+cubic crystalline environment, as commonly occurs in transition metal oxides.
+We make a direct comparison with the widely used $t_{2g}$ only or $e_g$ only
+model, depending on electronic filling. We consider all electron fillings of
+the $d$-shell and compute the total magnetic moment, the spin, the occupancy of
+each orbital, and the effective spin-orbit coupling strength (renormalized
+through interaction effects) in terms of the bare interaction parameters,
+spin-orbit coupling, and crystal field splitting, focusing on the parameter
+ranges relevant to 4d and 5d transition metal oxides. In various limits we
+provide perturbative results consistent with our numerical calculations. We
+find that the $t_{2g}$-$e_g$ mixing can be large, with up to 20\% occupation of
+orbitals that are nominally ""empty"", which has experimental implications for
+the interpretation of the branching ratio in experiments, and can impact the
+effective local moment Hamiltonian used to study magnetic phases and magnetic
+excitations in transition metal oxides. Our results can aid the theoretical
+interpretation of experiments on these materials, which often fall in a regime
+of intermediate coupling with respect to electron-electron interactions.",1711.02328v2
+2023-06-20,Metallic ruthenium ilmenites: first-principles study of MgRuO$_3$ and CdRuO$_3$,"Ilmenites $AB$O$_3$ provide a platform for electron correlation and magnetism
+on alternatively stacked honeycomb layers of edge-sharing $A$O$_6$ or $B$O$_6$
+octahedra. When $A$ and $B$ are $3d$ transition metals, strong electron
+correlation makes the systems Mott insulators showing various magnetic
+properties, while when $B$ is Ir with $5d$ electrons, competition between
+electron correlation and spin-orbit coupling realizes a spin-orbital coupled
+Mott insulator as a potential candidate for quantum spin liquids. Here we
+theoretically investigate intermediate $4d$ ilmenites, $A$RuO$_3$ with $A$=Mg
+and Cd, which were recently synthesized and shown to be metallic, unlike the
+$3d$ and $5d$ cases. By using first-principles calculations, we optimize the
+lattice structures and obtain the electronic band structures. We show that
+MgRuO$_3$ exhibits strong dimerization on RuO$_6$ honeycomb layers, leading to
+the formation of bonding and anti-bonding bands for one of three $t_{2g}$
+orbitals; the lattice symmetry is lowered from $R\bar{3}$ to $P\bar{1}$, and
+the Fermi surfaces are composed of the other two $t_{2g}$ orbitals. In
+contrast, we find that CdRuO$_3$ has a lattice structure close to $R\bar{3}$,
+and all three $t_{2g}$ orbitals contribute almost equally to the Fermi
+surfaces. Comparison of our results with other Ru honeycomb materials such as
+Li$_2$RuO$_3$ indicates that the metallic ruthenium ilmenites stand on a subtle
+balance among electron correlation, spin-orbit coupling, and electron-phonon
+coupling.",2306.11542v1
+2013-08-01,Rashba-induced spin electromagnetic fields in a strong sd coupling regime,"Spin electromagnetic fields driven by the Rashba spin-orbit interaction, or
+Rashba-induced spin Berry's phase, in ferromagnetic metals is theoretically
+studied based on the Keldysh Green's function method. Considering a limit of
+strong sd coupling without spin relaxation (adiabatic limit), the spin electric
+and magnetic fields are determined by calculating transport properties. The
+spin electromagnetic fields turn out to be expressed in terms of a
+Rashba-induced effective vector potential, and thus they satisfy the Maxwell's
+equation. In contrast to the conventional spin Berry's phase, the
+Rashba-induced one is linear in the gradient of magnetization profile, and thus
+can be extremely large even for slowly varying structures. We show that the
+Rashba-induced spin Berry's phase exerts the Lorentz force on spin resulting in
+a giant spin Hall effect in magnetic thin films in the presence of
+magnetization structures. Rashba-induced spin magnetic field would be useful to
+distinguish between topologically equivalent magnetic structures.",1308.0152v1
+2016-11-10,Laser-induced ultrafast demagnetization time and spin moment in ferromagnets: First-principles calculation,"When a laser pulse excites a ferromagnet, its spin undergoes a dramatic
+change. The initial demagnetization process is very fast. Experimentally, it is
+found that the demagnetization time is related to the spin moment in the
+sample. In this study, we employ the first-principles method to directly
+simulate such a process. We use the fixed spin moment method to change the spin
+moment in ferromagnetic nickel, and then we employ the Liouville equation to
+couple the laser pulse to the system. We find that in general the dependence of
+demagnetization time on the spin moment is nonlinear: It decreases with the
+spin moment up to a point, after which an increase with the spin moment is
+observed, followed by a second decrease. To understand this, we employ an
+extended Heisenberg model, which includes both the exchange interaction and
+spin-orbit coupling. The model directly links the demagnetization rate to the
+spin moment itself and demonstrates analytically that the spin relaxes more
+slowly with a small spin moment. A future experimental test of our predictions
+is needed.",1611.03154v1
+2016-12-29,Theory of electron transport and magnetization dynamics in metallic ferromagnets,"Magnetic electric effects in ferromagnetic metals are discussed from the
+viewpoint of effective spin electromagnetic field that couples to conduction
+electron spin. The effective field in the adiabatic limit is the spin Berry's
+phase in space and time, and it leads to spin motive force (voltage generated
+by magnetization dynamics) and topological Hall effect due to spin chirality.
+Its gauge coupling to spin current describes the spin transfer effect, where
+magnetization structure is driven by an applied spin current. The idea of
+effective gauge field can be extended to include spin relaxation and Rashba
+spin-orbit interaction. Voltage generation by the inverse Edelstein effect in
+junctions is interpreted as due to the electric component of Rashba-induced
+spin gauge field. The spin gauge field arising from the Rashba interaction
+turns out to coincides with troidal moment, and causes asymmetric light
+propagation (directional dichroism) as a result of the Doppler shift. Rashba
+conductor without magnetization is shown to be natural metamaterial exhibiting
+negative refraction.",1612.09019v1
+2023-06-15,Efficient Spin Seebeck and Spin Nernst Effects of Magnons in Altermagnets,"We report two non-degenerate magnon modes with opposite spins or chiralities
+in collinearly antiferromagnetic insulators driven by symmetry-governed
+anisotropic exchange couplings. The consequent giant spin splitting contributes
+to spin Seebeck and spin Nernst effects generating longitudinal and transverse
+spin currents when the temperature gradient applies along and away from the
+main crystal axis, without requiring any external magnetic field and spin-orbit
+coupling. Based on first-principle calculations, we predict feasible material
+candidates holding robust altermagnetic spin configurations and
+room-temperature structural stability to efficiently transport spin. The spin
+Seebeck conductivity is comparable to the records of antiferromagnets that
+require the magnetic field, and the spin Nernst conductivity is two orders in
+magnitude larger than that in antiferromagnetic monolayers that need Berry
+curvature.",2306.08976v2
+2000-02-13,Magnetic impurities in the one-dimensional spin-orbital model,"Using one-dimensional spin-orbital model as a typical example of quantum spin
+systems with richer symmetries, we study the effect of an isolated impurity on
+its low energy dynamics in the gapless phase through bosonization and
+renormalization group methods. In the case of internal impurities, depending on
+the symmetry, the boundary fixed points can be either an open chain with a
+residual spin or (and) orbital triplet left behind, or a periodic chain.
+However, these two fixed points are indistinguishable in the sense that in both
+cases, the lead-correction-to-scaling boundary operators (LCBO) only show
+Fermi-liquid like corrections to thermodynamical quantities. (Except the
+possible Curie-like contributions from the residual moments in the latter
+cases.) In the case of external (Kondo) impurities, the boundary fixed points,
+depending on the sign of orbital couplings, can be either an open chain with an
+isolated orbital doublet due to Kondo screening or it will flow to an
+intermediate fixed point with the same LCBO as that of the two-channel Kondo
+problem. Comparison with the Kondo effect in one-dimensional (1D) Heisenberg
+spin chain and multi-band Hubbard models is also made.",0002184v1
+2006-06-20,Intrinsic and Rashba Spin-orbit Interactions in Graphene Sheets,"Starting from a microscopic tight-binding model and using second order
+perturbation theory, we derive explicit expressions for the intrinsic and
+Rashba spin-orbit interaction induced gaps in the Dirac-like low-energy band
+structure of an isolated graphene sheet. The Rashba interaction parameter is
+first order in the atomic carbon spin-orbit coupling strength $\xi$ and first
+order in the external electric field $E$ perpendicular to the graphene plane,
+whereas the intrinsic spin-orbit interaction which survives at E=0 is second
+order in $\xi$. The spin-orbit terms in the low-energy effective Hamiltonian
+have the form proposed recently by Kane and Mele. \textit{Ab initio} electronic
+structure calculations were performed as a partial check on the validity of the
+tight-binding model.",0606504v4
+2004-07-13,Spin-orbit splitting of 9 Lambda Be excited states studied with the SU_6 quark-model baryon-baryon interactions,"The previous Faddeev calculation of the two-alpha plus Lambda system for 9
+Lambda Be is extended to incorporate the spin-orbit components of the SU_6
+quark-model baryon-baryon interactions. We employ the Born kernel of the
+quark-model Lambda N LS interaction, and generate the spin-orbit component of
+the Lambda alpha potential by the alpha-cluster folding. The Faddeev
+calculation in the jj-coupling scheme implies that the direct use of the
+quark-model Born kernel for the Lambda N LS component is not good enough to
+reproduce the small experimental value Delta E^exp_{ls}=43 +- 5 keV for the
+5/2^+ - 3/2^+ splitting. This procedure predicts three to five times larger
+values in the model FSS and fss2. The spin-orbit contribution from the
+effective meson-exchange potentials in fss2 is argued to be unfavorable to the
+small ls splitting, through the analysis of the Scheerbaum factors for the
+single-particle spin-orbit potentials calculated in the G-matrix formalism.",0407039v1
+2011-02-13,Orbital magnetic moment and extrinsic spin Hall effect for iron impurity in gold,"We report electronic structure calculations of an iron impurity in gold host.
+The spin, orbital and dipole magnetic moments were investigated using the
+LDA+$U$ correlated band theory. We show that the {\em
+around-mean-field}-LDA+$U$ reproduces the XMCD experimental data well and does
+not lead to formation of a large orbital moment on the Fe atom. Furthermore,
+exact diagonalization of the multi-orbital Anderson impurity model with the
+full Coulomb interaction matrix and the spin-orbit coupling is performed in
+order to estimate the spin Hall angle. The obtained value $\gamma_S \approx
+0.025$ suggests that there is no giant extrinsic spin Hall effect due to
+scattering on iron impurities in gold.",1102.2614v1
+2011-06-28,Theoretical investigation of the evolution of the topological phase of Bi$_{2}$Se$_{3}$ under mechanical strain,"The topological insulating phase results from inversion of the band gap due
+to spin-orbit coupling at an odd number of time-reversal symmetric points. In
+Bi$_2$Se$_3$, this inversion occurs at the $\Gamma$ point. For bulk
+Bi$_2$Se$_3$, we have analyzed the effect of arbitrary strain on the $\Gamma$
+point band gap using Density Functional Theory. By computing the band structure
+both with and without spin-orbit interactions, we consider the effects of
+strain on the gap via Coulombic interaction and spin-orbit interaction
+separately. While compressive strain acts to decrease the Coulombic gap, it
+also increases the strength of the spin-orbit interaction, increasing the
+inverted gap. Comparison with Bi$_2$Te$_3$ supports the conclusion that effects
+on both Coulombic and spin-orbit interactions are critical to understanding the
+behavior of topological insulators under strain, and we propose that the
+topological insulating phase can be effectively manipulated by inducing strain
+through chemical substitution.",1106.5556v1
+2013-03-19,Highly relativistic circular orbits of spinning particle in the Kerr field,"The Mathisson-Papapetrou equations in Kerr's background are considered. The
+region of existence of highly relativistic planar circular orbits of a spinning
+particle in this background and dependence of the particle's Lorentz
+$\gamma$-factor on its spin and radial coordinate are investigated. It is shown
+that in contrast to the highly relativistic circular orbits of a spinless
+particle the corresponding orbits of a spinning particle are allowed in much
+wider space region. Some of these orbits show the significant attractive action
+of the spin-gravity coupling on a particle and others are caused by the
+significant repulsive action. Numerical estimates for electrons, protons and
+neutrinos in the gravitational field of black holes are presented.",1303.4707v1
+2013-12-15,Spin-Orbit Effects in Atomic High-Harmonic Generation,"Spin-orbit interactions lead to small energy gaps between the outer-most
+$p_{1/2}$ and $p_{3/2}$ shells of noble gas atoms. Strong-field pulses
+tunnel-ionize an electron out of either shell resulting in spin-orbit-driven
+hole motion. These hole dynamics affect the HHG yield. However, the spectral
+shape as well as the angular distribution of the HHG emission is not influenced
+by spin-orbit coupling. We demonstrate the spin-orbit effect on atomic krypton
+by solving the multi-electron Schr\""odinger equation with the time-dependent
+configuration-interaction singles (TDCIS) approach. We also provide pulse
+parameters where this effect can be identified in experiments through an
+enhancement in the HHG yield as the wavelength of the strong-field pulse
+increases.",1312.4151v1
+2014-10-21,Dissipation dynamics and spin-orbit force in time-dependent Hartree-Fock theory,"We investigate the one-body dissipation dynamics in heavy-ion collisions of
+$^{16}{\rm O}$+$^{16}{\rm O}$ using a fully three-dimensional time-dependent
+Hartree-Fock (TDHF) theory with the modern Skyrme energy functional and without
+any symmetry restrictions. The energy dissipation is revealed to decrease in
+deep-inelastic collisions of the light systems as the bombarding energy
+increases owing to the competition between collective motion and
+single-particle degrees of freedom. The role of spin-orbit force is given
+particular emphasis in deep-inelastic collisions. The spin-orbit force causes a
+significant enhancement of the dissipation. The time-even coupling of
+spin-orbit force plays a dominant role at low energies, while the influence of
+time-odd terms is notable at high energies. About 40-65\% of the total
+dissipation depending on the different parameter sets is predicted to arise
+from the spin-orbit force. The theoretical fusion cross section has a
+reasonably good agreement with the experimental data, considering that no free
+parameters are adjusted to reaction dynamics in the TDHF approach.",1410.5573v1
+2020-02-16,Electric-field control of spin-orbit torques in perpendicularly magnetized W/CoFeB/MgO films,"Controlling magnetism by electric fields offers a highly attractive
+perspective for designing future generations of energy-efficient information
+technologies. Here, we demonstrate that the magnitude of current-induced
+spin-orbit torques in thin perpendicularly magnetized CoFeB films can be tuned
+and even increased by electric field generated piezoelectric strain. Using
+theoretical calculations, we uncover that the subtle interplay of spin-orbit
+coupling, crystal symmetry, and orbital polarization is at the core of the
+observed strain dependence of spin-orbit torques. Our results open a path to
+integrating two energy efficient spin manipulation approaches, the electric
+field-induced strain and the current-induced magnetization switching, thereby
+enabling novel device concepts.",2002.06578v1
+2004-05-18,Spin-other-orbit operator in the tensorial form of second quantization,"The tensorial form of the spin-other-orbit interaction operator in the
+formalism of second quantization is presented. Such an expression is needed to
+calculate both diagonal and off-diagonal matrix elements according to an
+approach, based on a combination of second quantization in the coupled
+tensorial form, angular momentum theory in three spaces (orbital, spin and
+quasispin), and a generalized graphical technique. One of the basic features of
+this approach is the use of tables of standard quantities, without which the
+process of obtaining matrix elements of spin-other-orbit interaction operator
+between any electron configurations is much more complicated. Some special
+cases are shown for which the tensorial structure of the spin-other-orbit
+interaction operator reduces to an unusually simple form.",0405092v1
+2011-05-02,Relativistic Electron Vortex Beams: Angular Momentum and Spin-Orbit Interaction,"Motivated by the recent discovery of electron vortex beams carrying orbital
+angular momentum (AM), we construct exact Bessel-beam solutions of the Dirac
+equation. They describe relativistic and nonparaxial corrections to the scalar
+electron beams. We describe the spin and orbital AM of the electron with
+Berry-phase corrections and predict the intrinsic spin-orbit coupling in free
+space. This can be observed as a spin-dependent probability distribution of the
+focused electron vortex beams. Moreover, the magnetic moment is calculated,
+which shows different $g$-factors for spin and orbital AM and also contains the
+Berry-phase correction.",1105.0331v3
+2013-11-21,Wave patterns generated by a flow of two-component Bose-Einstein condensate with spin-orbit interaction past a localized obstacle,"It is shown that spin-orbit interaction leads to drastic changes in wave
+patterns generated by a flow of two-component Bose-Einstein condensate (BEC)
+past an obstacle. The combined Rashba and Dresselhaus spin-orbit interaction
+affects in different ways two types of excitations---density and polarization
+waves---which can propagate in a two-component BEC. We show that the density
+and polarization ""ship wave"" patterns rotate in opposite directions around the
+axis located at the obstacle position and the angle of rotation depends on the
+strength of spin-orbit interaction. This rotation is accompanied by narrowing
+of the Mach cone. The influence of spin-orbit coupling on density solitons and
+polarization breathers is studied numerically.",1311.5387v1
+2014-10-24,Frustration and Entanglement in Compass and Spin-Orbital Models,"We review the consequences of intrinsic frustration of the orbital
+superexchange and of spin-orbital entanglement. While Heisenberg perturbing
+interactions remove frustration in the compass model, the lowest columnar
+excitations are robust in the nanoscopic compass clusters and might be used for
+quantum computations. Entangled spin-orbital states determine the ground states
+in some cases, while in others concern excited states and lead to measurable
+consequences, as in the $R$VO$_3$ perovskites. On-site entanglement for strong
+spin-orbit coupling generates the frustrated Kitaev-Heisenberg model with a
+rich magnetic phase diagram on the honeycomb lattice. Frustration is here
+reflected in hole propagation which changes from coherent in an antiferromagnet
+via hidden quasiparticles in zigzag and stripe phases to entirely incoherent
+one in the Kitaev spin liquid.",1410.6722v1
+2015-10-06,Anomalous magnetic response of a quasi-periodic mesoscopic ring in presence of Rashba and Dresselhaus spin-orbit interactions,"We investigate the properties of persistent charge current driven by magnetic
+flux in a quasi-periodic mesoscopic Fibonacci ring with Rashba and Dresselhaus
+spin-orbit interactions. Within a tight-binding framework we work out
+individual state currents together with net current based on second-quantized
+approach. A significant enhancement of current is observed in presence of
+spin-orbit coupling and sometimes it becomes orders of magnitude higher
+compared to the spin-orbit interaction free Fibonacci ring. We also establish a
+scaling relation of persistent current with ring size, associated with the
+Fibonacci generation, from which one can directly estimate current for any
+arbitrary flux, even in presence of spin-orbit interaction, without doing
+numerical simulation. The present analysis indeed gives a unique opportunity of
+determining persistent current and has not been discussed so far.",1510.01438v4
+2015-10-08,"Orbital order, spin waves, and doping effects in the $(π,0)$ SDW state --- comparative study of the three band models for iron pnictides","Aimed at identifying the role of microscopic Hamiltonian parameters on spin
+wave excitations, orbital order, and magnetic moments in the $(\pi,0)$ SDW
+state, two different three band models for iron pnictides are compared --- one
+at two-third filling ($n=4$) and another at half filling $(n=3)$ --- both of
+which yield qualitatively correct Fermi surface structure in the paramagnetic
+state. Spin wave analysis of the model at $n=4$ shows instability of the SDW
+state, which is attributed to weakly developed magnetic moments and weak
+magnetic couplings due to overfilling, as inferred from the observed
+stabilization of the SDW state and enhancement of magnetic excitation energies
+upon hole doping. In contrast, the model at $n=3$ (half filling) yields a
+gapped SDW state with well developed magnetic moments and the calculated spin
+wave excitations are in excellent agreement with INS experiments. The sign of
+the orbital order ($n_{xz} - n_{yz} \approx +0.2$) is also in agreement with
+experiments. Both the zone boundary spin wave energies in the F and AF
+directions as well as the orbital order are shown to peak near half filling,
+highlighting the correlation between orbital order and SDW state stabilization.",1510.02276v1
+2008-07-15,Single spin asymmetry and five-quark components of the proton,"We examine the single-spin asymmetry (SSA) caused by the five-quark
+components of the proton for semi-inclusive electroproduction of charged pions
+in deep-inelastic scattering on a transversely polarized hydrogen target. The
+large SSA is considered to have close relation with quark orbital motion in the
+proton and suggests that the quark orbital angular momentum is nonzero. For the
+five-quark $qqqq\bar{q}$ components of the proton, the lowest configurations
+with $qqqq$ system orbitally excited and the $\bar{q}$ in the ground state
+would give spin-orbit correlations naturally for the quarks in a polarized
+proton. We show that based on the basic reaction $\gamma q \to \pi q'$, the
+orbital-spin coupling of the probed quarks in the five-quark configuration
+leads to the single-spin asymmetry consistent with recent experiment results.",0807.2324v1
+2018-10-31,Spin-orbital excitons and their potential condensation in pentavalent iridates,"We investigate magnetic excitations in iridium insulators with pentavalent
+Ir$^{5+}$ ($5d^4$) ions with strong spin-orbit coupling. We obtain a
+microscopic model based on the local Ir$^{5+}$ multiplets involving $J=0$
+(singlet), $J=1$ (triplet), and $J=2$ (quintet) spin-orbital states. We get
+effective interactions between these multiplets on square and
+face-centered-cubic (fcc) structures of magnetic ions in the
+layered-perovskites and the double-perovkites, in particular Ba$_2$YIrO$_6$.
+Further, we derive an effective spin-orbital Hamiltonian in terms of bond
+bosons and explore possible instabilities towards magnetic and quadrupole
+orderings. Additionally, we study charge excitations with help of the
+variational cluster perturbation theory and calculate the electronic charge gap
+as a function of hopping and Coulomb interactions. Based on both electronic and
+magnetic phase diagrams, we verify the possibility of excitonic magnetism due
+to condensation of spin-orbital excitons in Ir$^{5+}$ iridates.",1810.13058v2
+2023-02-01,Controlled longitudinal spin-orbit separation of complex vector modes,"Complex vector modes, entangled in spin and orbital angular momentum, are
+opening burgeoning opportunities for a wide variety of applications.
+Importantly, the flexible manipulation the various properties of such beams
+will pave the way to novel applications. As such, in this manuscript, we
+demonstrate a longitudinal spin-orbit separation of complex vector modes
+propagating in free space. To achieve this we employed the recently
+demonstrated circular Airy Gaussian vortex vector (CAGVV) modes, which feature
+a self-focusing property. More precisely, by properly manipulating the
+intrinsic parameters of CAGVV modes, the strong coupling between the two
+constituting orthogonal components of CAGVV mode undergo a spin-orbit
+separation along the propagation direction namely, while one polarisation
+component, focuses at a specific plane, the other focuses at a different plane.
+Such spin-orbit separation, which we demonstrated by numerical simulations and
+corroborated experimentally, can be adjusted on-demand by simply changing the
+initial parameters of CAGVV modes. Our findings will be of great relevance, for
+example in optical tweezers, to manipulate micro- or nano-particles at two
+different parallel planes.",2302.00241v1
+2007-04-01,High-spin to low-spin and orbital polarization transitions in multiorbital Mott systems,"We study the interplay of crystal field splitting and Hund coupling in a
+two-orbital model which captures the essential physics of systems with two
+electrons or holes in the e_g shell. We use single site dynamical mean field
+theory with a recently developed impurity solver which is able to access strong
+couplings and low temperatures. The fillings of the orbitals and the location
+of phase boundaries are computed as a function of Coulomb repulsion, exchange
+coupling and crystal field splitting. We find that the Hund coupling can drive
+the system into a novel Mott insulating phase with vanishing orbital
+susceptibility. Away from half-filling, the crystal field splitting can induce
+an orbital selective Mott state.",0704.0057v2
+2006-11-17,Coherent optical manipulation of triplet-singlet states in coupled quantum dots,"We show that spin-orbit coupling in a quantum dot molecule allows for
+coherent manipulation of two electron spin states using Raman transitions. Such
+two-electron spin states defined by the singlet and triplet states of two
+exchange coupled quantum dots can have favorable coherence properties. In
+addition, two of the four metastable ground states in this system can be used
+as auxiliary states that could facilitate implementation of tasks such as
+mapping of spin states to that of a single propagating photon. We find that
+even weak spin-orbit effects -- manifesting themselves as slightly different
+g-factors for the electron and the hole -- would allow for the coherent Raman
+coupling of the singlet-triplet states. We also discuss the possibilities for
+implementing quantum optical techniques for spin preparation and manipulation.",0611469v1
+2021-01-20,Dynamical preparation of stripe states in spin-orbit coupled gases,"In spinor Bose-Einstein condensates, spin-changing collisions are a
+remarkable proxy to coherently realize macroscopic many-body quantum states.
+These processes have been, e.g., exploited to generate entanglement, to study
+dynamical quantum phase transitions, and proposed for realizing nematic phases
+in atomic condensates. In the same systems dressed by Raman beams, the coupling
+between spin and momentum induces a spin dependence in the scattering processes
+taking place in the gas. Here we show that, at weak couplings, such modulation
+of the collisions leads to an effective Hamiltonian which is equivalent to the
+one of an artificial spinor gas with spin-changing collisions that are tunable
+with the Raman intensity. By exploiting this dressed-basis description, we
+propose a robust protocol to coherently drive the spin-orbit coupled condensate
+into the ferromagnetic stripe phase via crossing a quantum phase transition of
+the effective low-energy model in an excited-state.",2101.08253v3
+2018-03-21,Spin-orbital-angular-momentum coupled Bose-Einstein condensates,"We demonstrate coupling between the atomic spin and orbital-angular-momentum
+(OAM) of the atom's center-of-mass motion in a Bose-Einstein condensate (BEC).
+The coupling is induced by Raman-dressing lasers with a Laguerre-Gaussian beam,
+and creates coreless vortices in a $F=1$ $^{87}$Rb spinor BEC. We observe
+correlations between spin and OAM in the dressed state and characterize the
+spin texture; the result is in good agreement with the theory. In the presence
+of the Raman field our dressed state is stable for 0.1~s or longer, and it
+decays due to collision-induced relaxation. As we turn off the Raman beams, the
+vortex cores in the bare spin $|m_F=1\rangle$ and $|-1\rangle$ split. These
+spin-OAM coupled systems with the Raman-dressing approach have great potential
+for exploring new topological textures and quantum states.",1803.07860v3
+2014-05-21,Spin-orbit coupled Bose-Einstein condensates in a double well,"We study the quantum dynamics of a spin-orbit (SO) coupled Bose-Einstein
+condensate (BEC) in a double-well potential inspired by the experimental
+protocol recently developed by NIST group. We focus on the regime where the
+number of atoms is very large and perform a two-mode approximation. An
+analytical solution of the two-site Bose-Hubbard-like Hamiltonian is found for
+several limiting cases, which range from a strong Raman coupling to a strong
+Josephson coupling, ending with the complete model in the presence of weak
+nonlinear interactions. Depending on the particular limit, different approaches
+are chosen: a mapping onto an SU(2) spin problem together with a
+Holstein-Primakoff transformation in the first two cases and a rotating wave
+approximation (RWA) when dealing with the complete model. The quantum evolution
+of the number difference of bosons with equal or different spin between the two
+wells is investigated in a wide range of parameters; finally the corresponding
+total atomic current and the spin current are computed. We show a spin
+Josephson effect which could be detected in experiments and employed to build
+up realistic devices.",1405.5356v1
+2001-09-28,"Spin, spin-orbit, and electron-electron interactions in mesoscopic systems","We review recent theoretical developments about the role of spins,
+electron-electron interactions, and spin-orbit coupling in metal nanoparticles
+and semiconductor quantum dots. For a closed system, in the absence of
+spin-orbit coupling or of an external magnetic field, electron-electron
+interactions make it possible to have ground states with spin $S > 1/2$. We
+review here a theoretical analysis which makes predictions for the probability
+of finding various values of spin $S$ for an irregular particle in the limit
+where the number of electron is large but finite. We also present results for
+the probability distribution of the spacing between successive groundstate
+energies in such a particle. In a metallic particle with strong spin-orbit
+interactions, for odd electron number, the groundstate has a Kramers'
+degeneracy, which is split linearly by a weak applied magnetic field. The
+splitting may be characterized by an effective $g$-tensor whose principal axes
+and eigenvalues vary from one level to another. Recent calculations have
+addressed the joint probability distribution, including the anisotropy, of the
+eigenvalues. The peculiar form of the spin-orbit coupling for a two-dimensional
+electron system in a GaAs heterostructure or quantum well leads to a strong
+suppression of spin-orbit effects when the electrons are confined in a small
+quantum dot. Spin-effects can be enhanced, however, in the presence of an
+applied magnetic field parallel to the layer, which may explain recent
+observations on fluctuations in the conductances through such dots. We also
+discuss possible explanations for the experimental observations by Davidovic
+and Tinkham of a multiplet splitting of the lowest resonance in the tunneling
+conductance through a gold nano-particle.",0109541v1
+2015-07-10,Spin-orbit coupling in methyl functionalized graphene,"We present first-principles calculations of the electronic band structure and
+spin-orbit effects in graphene functionalized with methyl molecules in dense
+and dilute limits. The dense limit is represented by a 2$\times$2 graphene
+supercell functionalized with one methyl admolecule. The calculated spin-orbit
+splittings are up to $0.6$ meV. The dilute limit is deduced by investigating a
+large, 7$\times$7, supercell with one methyl admolecule. The electronic band
+structure of this supercell is fitted to a symmetry-derived effective
+Hamiltonian, allowing us to extract specific hopping parameters including
+intrinsic, Rashba, and PIA (pseudospin inversion asymmetry) spin-orbit terms.
+These proximity-induced spin-orbit parameters have magnitudes of about 1 meV,
+giant compared to pristine graphene whose intrinsic spin-orbit coupling is
+about 10 $\mu$eV. We find that the origin of this giant local enhancement is
+the $sp^3$ corrugation and the breaking of local pseudospin inversion symmetry,
+as in the case of hydrogen adatoms. Also similar to hydrogen, methyl acts as a
+resonant scatterer, with a narrow resonance peak near the charge neutrality
+point. We also calculate STM-like images showing the local charge densities at
+different energies around methyl on graphene.",1507.02820v2
+2017-11-08,Planet Formation in Disks with Inclined Binary Companions: Can Primordial Spin-Orbit Misalignment be Produced?,"Many hot Jupiter (HJ) systems have been observed to have their stellar spin
+axis misaligned with the planet's orbital angular momentum axis. The origin of
+this spin-orbit misalignment and the formation mechanism of HJs remain poorly
+understood. A number of recent works have suggested that gravitational
+interactions between host stars, protoplanetary disks, and inclined binary
+companions may tilt the stellar spin axis with respect to the disk's angular
+angular momentum axis, producing planetary systems with misaligned orbits.
+These previous works considered idealized disk evolution models and neglected
+the gravitational influence of newly formed planets. In this paper, we explore
+how disk photoevaporation and planet formation and migration affect the
+inclination evolution of planet-star-disk-binary systems. We take into account
+planet-disk interactions and the gravitational spin-orbit coupling between the
+host star and the planet. We find that the rapid depletion of the inner disk
+via photoevaporation reduces the excitation of stellar obliquities. Depending
+on the formation and migration history of HJs, the spin-orbit coupling between
+the star and the planet may reduces and even completely suppress the excitation
+of stellar obliquities. Our work constrains the formation/migration history of
+HJs. On the other hand, planetary systems with ""cold"" Jupiters or close-in
+super-earths may experience excitation of stellar obliquities in the presence
+of distant inclined companions.",1711.03138v2
+2021-04-25,Staggered spin-orbit interaction in a nanoscale device,"The coupling of the spin and the motion of charge carriers stems directly
+from the atomic structure of a conductor. It has become an important ingredient
+for the emergence of topological matter, and, in particular, topological
+superconductivity which could host non-abelian excitations such as Majorana
+modes or parafermions. These modes are sought after mostly in semiconducting
+platforms which are made of heavy atoms and therefore exhibit naturally a large
+spin-orbit interaction. Creating domain walls in the spin orbit interaction at
+the nanoscale may turn out to be a crucial resource for engineering topological
+excitations suitable for universal topological quantum computing. For example,
+it has been proposed for exploring exotic electronic states or for creating
+hinge states. Realizing this in natural platforms remains a challenge. In this
+work, we show how this can be alternatively implemented by using a synthetic
+spin orbit interaction induced by two lithographically patterned magnetically
+textured gates. By using a double quantum dot in a light material -- a carbon
+nanotube -- embedded in a microwave cavity, we trigger hopping between two
+adjacent orbitals with the microwave photons and directly compare the wave
+functions separated by the domain wall via the light-matter coupling. We show
+that we can achieve an engineered staggered spin-orbit interaction with a
+change of strength larger than the hopping energy between the two sites.",2104.12181v1
+2019-02-27,Intertwined spin-orbital coupled orders in the iron-based superconductors,"The underdoped phase diagram of the iron-based superconductors exemplifies
+the complexity common to many correlated materials. Indeed, multiple ordered
+states that break different symmetries but display comparable transition
+temperatures are present. Here, we argue that such a complexity can be
+understood within a simple unifying framework. This framework, built to respect
+the symmetries of the non-symmorphic space group of the FeAs/Se layer, consists
+of primary magnetically-ordered states and their vestigial phases that
+intertwine spin and orbital degrees of freedom. All vestigial phases have
+Ising-like and zero wave-vector order parameters, described in terms of
+composite spin order and exotic orbital-order patterns such as spin-orbital
+loop-currents, staggered atomic spin-orbit coupling, and emergent Rashba- and
+Dresselhaus-type spin-orbit interactions. Moreover, they host unusual
+phenomena, such as the electro-nematic effect, by which electric fields acts as
+transverse fields to the nematic order parameter, and the ferro-N\'eel effect,
+by which a uniform magnetic field induces N\'eel order. We discuss the
+experimental implications of our findings to iron-based superconductors and
+possible extensions to other correlated compounds with similar space groups.",1902.10831v2
+2008-04-03,Multiple Andreev reflections in a quantum dot coupled to superconductors: Effects of spin-orbit coupling,"We study the out-of-equilibrium current through a multilevel quantum dot
+contacted to two superconducting leads and in the presence of Rashba and
+Dresselhaus spin-orbit couplings, in the regime of strong dot-lead coupling.
+The multiple Andreev reflection (MAR) subgap peaks in the current voltage
+characteristics are found to be modified (but not suppressed) by the spin-orbit
+interaction, in a way that strongly depends on the shape of the dot confining
+potential. In a perfectly isotropic dot the MAR peaks are enhanced when the
+strength $\alpha_R$ and $\alpha_D$ of Rashba and Dresselhaus terms are equal.
+When the anisotropy of the dot confining potential increases the dependence of
+the subgap structure on the spin-orbit angle
+$\theta=\arctan(\alpha_D/\alpha_R)$ decreases. Furthermore, when an in-plane
+magnetic field is applied to a strongly anisotropic dot, the peaks of the
+non-linear conductance oscillate as a function of the magnetic field angle, and
+the location of the maxima and minima allows for a straightforward read-out of
+the spin-orbit angle $\theta$.",0804.0591v2
+2014-04-22,Order-by-disorder and spin-orbital liquids in a distorted Heisenberg-Kitaev model,"The microscopic modeling of spin-orbit entangled $j=1/2$ Mott insulators such
+as the layered hexagonal Iridates Na$_2$IrO$_3$ and Li$_2$IrO$_3$ has spurred
+an interest in the physics of Heisenberg-Kitaev models. Here we explore the
+effect of lattice distortions on the formation of the collective spin-orbital
+states which include not only conventionally ordered phases but also gapped and
+gapless spin-orbital liquids. In particular, we demonstrate that in the
+presence of spatial anisotropies of the exchange couplings conventionally
+ordered states are formed through an order-by-disorder selection which is not
+only sensitive to the type of exchange anisotropy but also to the relative
+strength of the Heisenberg and Kitaev couplings. The spin-orbital liquid phases
+of the Kitaev limit -- a gapless phase in the vicinity of spatially isotropic
+couplings and a gapped Z$_2$ phase for a dominant spatial anisotropy of the
+exchange couplings -- show vastly different sensitivities to the inclusion of a
+Heisenberg exchange. While the gapless phase is remarkably stable, the gapped
+Z$_2$ phase quickly breaks down in what might be a rather unconventional phase
+transition driven by the simultaneous condensation of its elementary
+excitations.",1404.5490v2
+2021-07-21,Robust propagating in-gap modes due to spin-orbit domain walls in graphene,"Recently, great experimental efforts towards designing topological electronic
+states have been invested in layered incommensurate heterostructures which form
+various nano- and meso-scale domains. In particular, it has become clear that a
+delicate interplay of different spin-orbit terms is induced in graphene on
+transition metal dichalcogenide substrates. We therefore theoretically study
+various types of domain walls in spin-orbit coupling in graphene looking for
+robust one-dimensional propagating electronic states. To do so, we use an
+interface Chern number and a spectral flow analysis in the low-energy theory
+and contrast our results to the standard arguments based on valley-Chern
+numbers or Chern numbers in continuum models. Surprisingly, we find that a
+sign-changing domain wall in valley-Zeeman spin-orbit coupling binds two robust
+Kramers pairs, within the bulk gap opened due to a simultaneous presence of
+Rashba coupling. We also study the robustness to symmetry breaking and lattice
+backscattering effects in tight-binding models. We show an explicit mapping of
+our valley-Zeeman domain wall to a domain wall in gated spinless bilayer
+graphene. We discuss the possible spectroscopic and transport signatures of
+various types of spin-orbit coupling domain walls in heterostructures.",2107.10116v2
+2010-09-02,On the influence of hidden momentum and hidden energy in the classical analysis of spin-orbit coupling in hydrogenlike atoms,"In a recent article, Kholmetskii, Missevitch and Yarmin [""On the classical
+analysis of spin-orbit coupling in hydrogenlike atoms,"" Am. J. Phys. 78(4),
+April 2010 (428-432)] examine in detail the spin-orbit coupling in the
+semiclassical hydrogenic atom, and identify a need to account for non-Coulomb
+forces not included in the standard analysis. Kholmetskii, et al., showed that
+the experimentally-measured coupling continues to be obtained when the new
+forces are incorporated in the analysis. This requires that the change in
+orbital radius due to non-Coulomb forces is also properly accounted for. In
+response to a comment, Kholmetskii, et al., showed that the
+experimentally-measured coupling continues to be obtained when so-called
+""hidden momentum"" forces are also included. However it has been postulated that
+when hidden momentum is nonvanishing, a corresponding hidden energy must also
+be present, that was not included in the total energy by Kholmetskii, et al.
+Hidden energy is postulated necessary to obtaining a relativistically covariant
+description. Inclusion of hidden energy leads to disagreement with the
+experimentally-determined spin-orbit coupling magnitude if the Bohr postulate,
+that orbital angular momentum is quantized in whole multiples of the reduced
+Planck constant, is assumed to apply to kinetic momentum alone. The empirical
+result may be recovered in the semiclassical picture and using the general
+approach developed by Kholmetskii, et al., if the Bohr postulate is
+reinterpreted to apply to orbital angular momentum that consists of hidden as
+well as kinetic momentum.",1009.0495v4
+2008-07-22,Anisotropic tunneling magnetoresistance and tunneling anisotropic magnetoresistance: spin-orbit coupling in magnetic tunnel junctions,"The effects of the spin-orbit interaction on the tunneling magnetoresistance
+of ferromagnet/semiconductor/normal metal tunnel junctions are investigated.
+Analytical expressions for the tunneling anisotropic magnetoresistance (TAMR)
+are derived within an approximation in which the dependence of the
+magnetoresistance on the magnetization orientation in the ferromagnet
+originates from the interference between Bychkov-Rashba and Dresselhaus
+spin-orbit couplings that appear at junction interfaces and in the tunneling
+region. We also investigate the transport properties of
+ferromagnet/semiconductor/ferromagnet tunnel junctions and show that in such
+structures the spin-orbit interaction leads not only to the TAMR effect but
+also to the anisotropy of the conventional tunneling magnetoresistance (TMR).
+The resulting anisotropic tunneling magnetoresistance (ATMR) depends on the
+absolute magnetization directions in the ferromagnets. Within the proposed
+model, depending on the magnetization directions in the ferromagnets, the
+interplay of Bychkov-Rashba and Dresselhaus spin-orbit couplings produces
+differences between the rates of transmitted and reflected spins at the
+ferromagnet/seminconductor interfaces, which results in an anisotropic local
+density of states at the Fermi surface and in the TAMR and ATMR effects. Model
+calculations for Fe/GaAs/Fe tunnel junctions are presented. Furthermore, based
+on rather general symmetry considerations, we deduce the form of the
+magnetoresistance dependence on the absolute orientations of the magnetizations
+in the ferromagnets.",0807.3564v1
+2023-06-27,Spin-orbital Jahn-Teller bipolarons,"Polarons and spin-orbit (SO) coupling are distinct quantum effects that play
+a critical role in charge transport and spin-orbitronics. Polarons originate
+from strong electron-phonon interaction and are ubiquitous in polarizable
+materials featuring electron localization, in particular $\mathrm{3d}$
+transition metal oxides (TMOs). On the other hand, the relativistic coupling
+between the spin and orbital angular momentum is notable in lattices with heavy
+atoms and develops in $\mathrm{5d}$ TMOs, where electrons are spatially
+delocalized. Here we combine ab initio calculations and magnetic measurements
+to show that these two seemingly mutually exclusive interactions are entangled
+in the electron-doped SO-coupled Mott insulator
+$\mathrm{Ba_2Na_{1-x}Ca_xOsO_6}$ ($0< x < 1$), unveiling the formation of
+spin-orbital bipolarons. Polaron charge trapping, favoured by the Jahn-Teller
+lattice activity, converts the Os $\mathrm{5d^1}$ spin-orbital
+$\mathrm{J_{eff}=3/2}$ levels, characteristic of the parent compound
+$\mathrm{Ba_2NaOsO_6}$ (BNOO), into a bipolaron $\mathrm{5d^2}$
+$\mathrm{J_{eff}=2}$ manifold, leading to the coexistence of different
+J-effective states in a single-phase material. The gradual increase of
+bipolarons with increasing doping creates robust in-gap states that prevents
+the transition to a metal phase even at ultrahigh doping, thus preserving the
+Mott gap across the entire doping range from $\mathrm{d^1}$ BNOO to
+$\mathrm{d^2}$ $\mathrm{Ba_2CaOsO_6}$ (BCOO).",2306.15757v1
+2023-10-26,Polarization and third-order Hall effect in III-V semiconductor heterojunctions,"We study Berry connection polarizability (BCP) induced electric polarization
+and third-order Hall (TOH) effect in a two-dimensional electron/hole gas
+(2DEG/2DHG) with Rashba-Dresselhaus (RD) spin-orbit couplings in III-V
+semiconductor heterostructures. The electric polarization decreases with the
+increase of the Fermi energy and is responsive to the electric field
+orientation in the presence of RD spin-orbit couplings for both systems. We
+determine the BCP-induced TOH conductivity ($\chi_{\perp}^{\text{I}}$) along
+with the TOH conductivity associated with the band velocity
+($\chi_{\perp}^{\text{II}}$). We find that the presence of an infinitesimal
+amount of Dresselhaus coupling in addition to the dominant Rashba coupling
+results in finite TOH responses. These conductivities vanish when the field is
+aligned with and/or orthogonal to the symmetry lines $k_x\pm k_y=0$ in both
+systems. For typical system parameters in a 2DEG with $k$-linear RD
+interactions, the magnitude of $\chi_{\perp}^{\text{I}}$ is smaller than that
+of $\chi_{\perp}^{\text{II}}$. On the other hand, when both the SO couplings
+are comparable, $\chi_{\perp}^{\text{I}}$ shows a notable increase in
+magnitude, owing to the distinctive characteristics of BCP. The TOH
+conductivity of 2DEG remains unchanged when Rashba and Dresselhaus spin-orbit
+couplings are exchanged. For 2DHG with $k$-cubic RD interactions,
+$\chi_{\perp}^{\text{I},h}$ exhibits a larger magnitude compared to
+$\chi_{\perp}^{\text{II},h}$. Unlike the electron case, the BCP induced
+$\chi_{\perp}^{\text{I},h}$ alters under the exchange of spin-orbit coupling
+parameters, whereas $\chi_{\perp}^{\text{II},h}$ remains the same.",2310.17371v2
+2021-04-14,"Spin-orbit coupling in organic microcavities: Lower polariton splitting, triplet polaritons, and disorder-induced dark-states relaxation","Using an extended Tavis-Cummings model, we study the effect of the spin-orbit
+coupling between the singlet and the triplet molecular excitons in organic
+microcavities in the strong coupling regime. The model is solved in the single
+excitation space for polaritons, which contains the bright (permutation
+symmetric) singlet and triplet excitons, as well as the dark bands consisting
+of the nonsymmetric excitons of either type. We find that the spin-orbit
+coupling splits the lower polariton into two branches, and also creates a
+triplet polariton when the cavity mode is in resonance with the triplet
+excitons. The optical absorption spectrum of the system that can reveal this
+splitting in experiments is presented and the effect of disorder in exciton
+energies and couplings is explored. An important consequence of the disorder in
+the spin-orbit coupling -- a weak coupling between the otherwise decoupled
+bright and dark sectors -- is explored and detailed calculations of the squared
+transition matrix elements between the dark bands and polaritons are presented
+along with derivation of some approximate yet quite accurate analytical
+expressions. This relaxation channel for the dark states contains an
+interference between two transition paths that, for a given polariton state,
+suppresses the relaxation of one dark band and enhances it for the other.",2104.07016v3
+2019-06-25,Unambiguous Electrical Detection of Spin-Charge Conversion in Lateral Spin-Valves,"Efficient detection of spin-charge conversion is crucial for advancing our
+understanding of emergent phenomena in spin-orbit-coupled nanostructures. Here,
+we provide proof of principle of an electrical detection scheme of spin-charge
+conversion that enables full disentanglement of competing spin-orbit coupling
+transport phenomena in diffusive lateral channels i.e. the inverse spin Hall
+effect (ISHE) and the spin galvanic effect (SGE). A suitable detection geometry
+in an applied oblique magnetic field is shown to provide direct access to
+spin-charge transport coefficients through a simple symmetry analysis of the
+output non-local resistance. The scheme is robust against tilting of the
+spin-injector magnetization, disorder and spurious non-spin related
+contributions to the non-local signal, and can be used to probe spin-charge
+conversion effects in both spin-valve and hybrid optospintronic devices.",1906.10448v2
+2008-05-11,Evolution of Spin-Orbital-Lattice Coupling in the $R$VO$_3$ Perovskites,"We introduce a microscopic model which unravels the physical mechanisms
+responsible for the observed phase diagram of the $R$VO$_3$ perovskites. It
+reveals a nontrivial interplay between superexchange, the orbital-lattice
+coupling due to the GdFeO$_3$-like rotations of the VO$_6$ octahedra, and
+orthorhombic lattice distortions. We find that the lattice strain affects the
+onset of the magnetic and orbital order by partial suppression of orbital
+fluctuations. The present approach provides also a natural explanation of the
+observed reduction of magnon energies from LaVO$_3$ to YVO$_3$.",0805.1545v1
+2018-07-18,Spin-orbit coupled soliton in a random potential,"We investigate theoretically the dynamics of a spin-orbit coupled soliton
+formed by a self- interacting Bose-Einstein condensate immersed in a random
+potential, in the presence of an artificial magnetic field. We find that due to
+the anomalous spin-dependent velocity, the synthetic Zeeman coupling can play a
+critical role in the soliton dynamics by causing its localization or
+delocalization, depending on the coupling strength and on the parameters of the
+random potential. The observed effects of the Zeeman coupling qualitatively
+depend on the type of self-interaction in the condensate since the spin state
+and the self-interaction energy of the condensate are mutually related if the
+invariance of the latter with respect to the spin rotation is lifted.",1807.06794v2
+2023-08-05,Analytical results for a spin-orbit coupled atom held in a non-Hermitian double well under synchronous combined modulation,"We propose a simple method of synchronous combined modulations to generate
+the exact analytic solutions for a spin-orbit (SO) coupled ultracold atom held
+in a non-Hermitian double-well potential. Based on the obtained analytical
+solutions, we mainly study the parity-time ($\mathcal{PT}$) symmetry of this
+system and the system stability for both balanced and unbalanced gain-loss
+between two wells. Under balanced gain and loss, the effect of the proportional
+constants between synchronous combined modulations and the SO-coupling strength
+on the $\mathcal{PT}$-symmetry breaking is revealed analytically. Surprisingly,
+we find when the Zeeman field is present, the stable spin-flipping tunneling
+between two wells can not occur in the non-Hermitian SO-coupled ultracold
+atomic system, but the stable spin-conserving tunneling can be performed. Under
+unbalanced gain and loss, the unique set of parameter conditions that can cause
+the system to stabilize is found. The results may provide a possibility for the
+exact control of $\mathcal{PT}$-symmetry breaking and quantum spin dynamics in
+a non-Hermitian SO-coupled system.",2308.02848v1
+2005-06-14,Spin-wave softening and Hund's coupling in ferromagnetic manganites,"Using one-orbital model of hole-doped manganites, we show with the help of
+Holstein-Primakov transformation that finite Hund's coupling is responsible for
+the spin-wave softening in the ferromagnetic $B$-phase manganites. We obtain an
+analytical result for the spin-wave spectrum for $\JH\gg t$. In the limit of
+infinte Hund's coupling, the spectrum is the conventional nearest-neighbor
+Heisenberg ferromagnetic spin-wave. The $o(t/\JH)$-order correction is negative
+and thus accounts for the softening near the zone boundary.",0506321v1
+2020-01-09,Block-Lanczos density-matrix renormalization-group approach to spin transport in Heisenberg chains coupled to leads,"We adapt the block-Lanczos density-matrix renormalization-group technique to
+study the spin transport in a spin chain coupled to two non-interacting
+fermionic leads. As an example, we consider leads described by two-dimensional
+tight-binding models on a square lattice. Although the simulations are carried
+out using a chain representation of the leads, observables in the original
+two-dimensional lattice can be calculated by reversing the block-Lanczos
+transformation. This is demonstrated for leads with Rashba spin-orbit coupling.",2001.02926v2
+2017-03-09,Spin-wave excitations in the SDW state of iron pnictides: a comparison between the roles of interaction parameters,"We investigate the role of Hund's coupling in the spin-wave excitations of
+the ($\pi, 0$) ordered magnetic state within a five-orbital tight-binding model
+for iron pnictides. To differentiate between the roles of intraorbital Coulomb
+interaction and Hund's coupling, we focus on the self-consistently obtained
+mean-field SDW state with a fixed magnetic moment obtained by using different
+sets of interaction parameters. We find that the Hund's coupling is crucial for
+the description of various experimentally observed characteristics of the
+spin-wave excitations including the anisotropy, energy-dependent behavior, and
+spin-wave spectral weight distribution.",1703.03228v2
+2012-11-29,Possible Manipulation of Kondo Effect by Transition between Antiferromagnetic and Ferromagnetic s-d Coupling,"Kondo effect originates from antiferromagnetic (AFM) s-d coupling between
+magnetic impurity and the conduction electron, while it will be totally
+quenched in ferromagnetic (FM) regime due to malfunction of spin-flip. We
+investigate the possibility of switching on/off Kondo effect by transition of
+AFM/FM s-d coupling using 3d-metal phthalocyanine molecule (MPc) on Au(111) as
+a model system. A Hamiltonian model is constructed based on the feature of MPc
+molecule to show the condition for AFM/FM s-d coupling. The AFM s-d coupling
+could transform to FM s-d coupling if the spin state of the lowest unoccupied
+orbital changes.",1211.6955v1
+2006-10-25,Spin relaxation of two-dimensional electrons with a hierarchy of spin-orbit couplings,"The density matrix formalism is applied to calculate the spin-relaxation time
+for two-dimensional systems with a hierarchy of spin-orbit couplings, such as
+Rashba-type, Dresselhaus-type and so on. It is found that the spin-relaxation
+time can be infinite if those coupling strengths $\alpha$, $\beta$, $\gamma_1$
+and $\gamma_2$ satisfy either condition (i) $\alpha=\beta, \gamma_1=0$ or (ii)
+$\alpha=-\beta, \gamma_2=0$, which correspond to the vanishing Yang-Mills
+""magnetic"" field. The effect caused by the application of an external magnetic
+field is also discussed. It is found that the longitudinal and in-plane spin
+components can possess infinite life time when the spin components, the Larmor
+precession frequency and the external magnetic field satisfy certain relations.",0610694v1
+2013-11-04,Photonic spin Hall effect in topological insulators,"In this paper we theoretically investigate the photonic spin Hall effect
+(SHE) of a Gaussian beam reflected from the interface between air and
+topological insulators (TIs). The photonic SHE is attributed to spin-orbit
+coupling and manifests itself as in-plane and transverse spin-dependent
+splitting. We reveal that the spin-orbit coupling effect in TIs can be routed
+by adjusting the axion angle variations. Unlike the transverse spin-dependent
+splitting, we find that the in-plane one is sensitive to the axion angle. It is
+shown that the polarization structure in magneto-optical Kerr effect is
+significantly altered due to the spin-dependent splitting in photonic SHE. We
+theoretically propose a weak measurement method to determine the strength of
+axion coupling by probing the in-plane splitting of photonic SHE.",1311.0556v1
+2015-11-17,Do micromagnets expose spin qubits to charge and Johnson noise?,"An ideal quantum dot spin qubit architecture requires a local magnetic field
+for one-qubit rotations. Such an inhomogeneous magnetic field, which could be
+implemented via a micromagnet, couples the qubit subspace with background
+charge fluctuations causing dephasing of spin qubits. In addition, a
+micromagnet generates magnetic field evanescent-wave Johnson noise. We derive
+an effective Hamiltonian for the combined effect of a slanting magnetic field
+and charge noise on a single-spin qubit and estimate the free induction decay
+dephasing times T2* for Si and GaAs. The effect of the micromagnet on Si qubits
+is comparable in size to that of spin-orbit coupling at an applied field of
+B=1T, whilst dephasing in GaAs is expected to be dominated by spin-orbit
+coupling. Tailoring the magnetic field gradient can efficiently reduce T2* in
+Si. In contrast, the Johnson noise generated by a micromagnet will only be
+important for highly coherent spin qubits.",1511.05247v1
+2018-04-28,Non-exponential long-range interaction of magnetic impurities in spin-orbit coupled superconductors,"The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction of magnetic impurities
+in a superconductor exponentially decreases when the distance $r$ between them
+is larger than the superconductor's coherence length, because this interaction
+is mediated by quasiparticles which have a gap in their energy spectrum. At the
+same time, the spin-singlet superconducting condensate was always assumed to
+stay neutral to magnetic impurities. Due to a spin-orbit coupling (SOC),
+however, Cooper pairs gain an admixture of spin-triplet correlated states which
+provide for a link between impurity spins and an s-wave condensate. It is shown
+that its static Goldstone mode mediates the $1/r^2$ interaction of the spins in
+two-dimensional (2D) systems. This effect is considered within two models: of a
+clean 2D s-wave superconductor with the strong Rashba SOC and of a bilayer
+system combining a 2D Rashba coupled electron gas and an s-wave superconducting
+film. The predicted long-range interaction can have a strong effect on a spin
+order in superconductor-magnetic impurity systems that are expected to host
+Majorana fermions.",1804.10756v2
+2020-02-06,Rashba controlled two-electron spin-charge qubits as building blocks of a quantum computer,"The spin-sensitive charge oscillation, controlled by an external magnetic
+field, was recently proposed as a mechanism of transformations of qubits,
+defined as two-electron spin-charge Wannier molecules in a square quantum dot.
+The paper expands this idea by including the effects of Rashba type spin-orbit
+coupling. The problem is studied theoretically by mapping the system to an
+analytic effective Hamiltonian for 8 low energy states, comprising singlet and
+triplet on each dot diagonal. The validity of the mapping is confirmed by
+comparing the energy and spin of full and mapped system, and also by the
+reproduction of charge-oscillation dynamics in the presence of magnetic flux.
+The newly introduced Rashba coupling significantly enriches the system
+dynamics, affecting the magnitude of charge oscillations and allowing the
+controlled transitions between singlet and triplet states due to the spin
+rotations, induced by spin-orbit coupling. The results indicate the possibility
+for use of the studied system for quantum information processing, while
+possible extensions of the system to serve as a qubit in a universal quantum
+computer, fulfilling all five DiVincenzo criteria, are also discussed.",2002.02426v1
+2020-03-03,Photoprotected spin Hall effect on graphene with substrate induced Rashba spin-orbit coupling,"We propose an experimental realization of the Spin Hall effect in graphene by
+illuminating a graphene sheet on top of a substrate with circularly polarized
+monochromatic light. The substrate induces a controllable Rashba type
+spin-orbit coupling which breaks the spin-degeneracy of the Dirac cones but it
+is gapless. The circularly polarized light induces a gap in the spectrum and
+turns graphene into a Floquet topological insulator with spin dependent edge
+states. By analyzing the high and intermediate frequency regimes, we find that
+in both parameter limits, the spin-Chern number can be tuned by the effective
+coupling strength of the charge particles to the radiation field and determine
+the condition for the photoinduced topological phase transition.",2003.01779v1
+2022-12-20,Spin dynamics in quantum dots on liquid helium,"Liquid He-4 is free from magnetic defects, making it an ideal substrate for
+electrons with long-lived spin states. Such states can serve as qubit states.
+Here we consider the spin states of electrons electrostatically localized in
+quantum dots on a helium surface. Efficient gate operations in this system
+require spin-orbit coupling. It can be created by a nonuniform magnetic field
+from a current-carrying wire, can be turned on and off, and allows one to
+obtain large electro-dipole moment and comparatively fast coupling of spins in
+neighboring dots. Of central importance is to understand the spin decay due to
+the spin-orbit coupling. We establish the leading mechanism of such decay and
+show that the decay is sufficiently slow to enable high-fidelity single- and
+two-qubit gate operations",2212.10683v1
+2023-01-02,Topological Kondo Superconductors,"Spin-triplet $p$-wave superconductors are promising candidates for
+topological superconductors. They have been proposed in various
+heterostructures where a material with strong spin-orbit interaction is coupled
+to a conventional $s$-wave superconductor by proximity effect. However,
+topological superconductors existing in nature and driven purely by strong
+electron correlations are yet to be studied. Here we propose a realization of
+such a system in a class of Kondo lattice materials in the absence of
+spin-orbit coupling and proximity effect. Therein, the odd-parity Kondo
+hybridization mediates ferromagnetic spin-spin coupling and leads to
+spin-triplet resonant-valence-bond ($t$-RVB) pairing between local moments.
+Spin-triplet $p\pm i p^\prime$-wave topological superconductivity is reached
+when Kondo effect co-exists with $t$-RVB. We identify the topological nature by
+the non-trivial topological invariant and the Majorana fermions at edges. Our
+results offer a comprehensive understanding of experimental observations on
+UTe$_2$, a U-based ferromagnetic heavy-electron superconductor.",2301.00538v1
+2006-10-06,Boundary spin Hall effect in a two-dimensional semiconductor system with Rashba spin-orbit coupling,"We derive boundary conditions for the coupled spin-charge diffusion equations
+at a transmitting interface between two-dimensional electron systems with
+different strengths of the Rashba spin-orbit (SO) coupling $\alpha$, and an
+electric field parallel to the interface. We consider the limit where the
+spin-diffusion length l_s is long compared to the electron mean free path l,
+and assume that $\alpha$ changes discontinuously on the scale of l_s. We find
+that the spin density is also discontinuous on the scale of l_s. In the case
+where the electron mobility is constant across the interface, this leads to the
+complete suppression of the expected spin injection from a region with
+$\alpha\neq0$ into a non-SO region with $\alpha=0$.",0610190v2
+2008-03-27,Fano and Dicke effects and spin polarization in a double Rashba-ring system side coupled to a quantum wire,"The electronic transport in a system of two quantum rings side-coupled to a
+quantum wire is studied via a single-band tunneling tight-binding Hamiltonian.
+We derived analytical expressions for the conductance and spin polarization
+when the rings are threaded by magnetic fluxes with Rashba spin-orbit
+interaction. We show that by using the Fano and Dicke effects this system can
+be used as an efficient spin-filter even for small spin orbit interaction and
+small values of magnetic flux. We compare the spin-dependent polarization of
+this design and the polarization obtained with one ring side coupled to a
+quantum ring. As a main result, we find better spin polarization capabilities
+as compared to the one ring design",0803.4014v1
+2018-05-10,Designing Rashba-Dresselhaus effect in magnetic insulators,"One of the major strategies to control magnetism in spintronics is to utilize
+the coupling between electron spin and its orbital motion. The Rashba and
+Dresselhaus spin-orbit couplings induce magnetic textures of band electrons
+called spin momentum locking, which produces a spin torque by the injection of
+electric current. However, joule heating had been a bottleneck for device
+applications. Here, we propose a theory to generate further rich spin textures
+in insulating antiferromagnets with broken spatial inversion symmetry (SIS),
+which is easily controlled by a small magnetic field. In antiferromagnets, the
+ordered moments host two species of magnons that serve as internal degrees of
+freedom in analogy with electron spins. The Dzyaloshinskii-Moriya interaction
+introduced by the SIS breaking couples the two-magnon-degrees of freedom with
+the magnon momentum. We present a systematic way to design such texture and to
+detect it via magnonic spin current for the realization of antiferromagnetic
+memory.",1805.03925v2
+2023-04-21,Magnetic properties of a spin-orbit entangled Jeff = 1/2 honeycomb lattice,"The interplay between spin-orbit coupling, anisotropic magnetic interaction,
+frustration-induced quantum fluctuations and spin correlations can lead to
+novel quantum states with exotic excitations in rare-earth-based quantum
+magnets. Herein, we present the crystal structure, magnetization, electron spin
+resonance (ESR), specific heat, and nuclear magnetic resonance (NMR)
+experiments on the polycrystalline samples of Ba9Yb2Si6O24, in which Yb3+ ions
+form a perfect honeycomb lattice without detectable anti-site disorder. The
+magnetization data reveal antiferromagnetically coupled spin-orbit entangled
+Jeff = 1/2 degrees of freedom of Yb3+ ions in the Kramers doublet state. The
+ESR measurements reveal that the first excited Kramers doublet is 32.3(7) meV
+above the ground state. The specific heat results suggest the absence of any
+long-range magnetic order in the measured temperature range. Furthermore, the
+29Si NMR results do not indicate any signature of magnetic ordering down to 1.6
+K, and the spin-lattice relaxation rate reveals the presence of a field-induced
+gap that is attributed to the Zeeman splitting of Kramers doublet state in this
+quantum material. Our experiments detect neither spin freezing nor long-range
+magnetic ordering down to 1.6 K. The current results suggest the presence of
+short-range spin correlations in this spin-orbit entangled Jeff =1/2 rare-earth
+magnet on a honeycomb lattice.",2304.10890v2
+2006-11-24,Spin dynamics in the regime of hopping conductivity,"We consider spin dynamics in the impurity band of a semiconductor with
+spin-split spectrum. Due to the splitting, phonon-assisted hops from one
+impurity to another are accompanied by rotation of the electron spin, which
+leads to spin relaxation. The system is strongly inhomogeneous because of
+exponential variation of hopping times. However, at very small couplings an
+electron diffuses over a distance exceeding the characteristic scale of the
+inhomogeneity during the time of spin relaxation, so one can introduce an
+averaged spin relaxation rate. At larger values of coupling the system is
+effectively divided into two subsystems: the one where relaxation is very fast
+and another one where relaxation is rather slow. In this case, spin decays due
+to escape of the electrons from one subsystem to another. As a result, the spin
+dynamics is non-exponential and hardly depends on spin-orbit coupling.",0611626v1
+2012-02-08,Tuning into the Kitaev spin liquid phase:A spin model on the honeycomb lattice with two types of Heisenberg exchange couplings,"We study a spin model on honeycomb lattice with two types of Heisenberg
+exchange couplings, $J$ and $\tilde J$, where $J$ is for the conventional spin
+and and $\tilde J$ for rotated spin. When $\tilde J=0$, this is the
+conventional Heisenberg model. When J=0, the system is either in a stripy
+antiferromagnetic order($\tilde J<0$, ferromagnetic for rotated spin) or a
+zig-zag antiferromagnetic order ($\tilde J>0$, antiferromagnetic for rotated
+spin). The competition between two ferromagnetic orders or two
+antiferromagnetic orders induces Kitaev's spin liquid phase characterized by
+the exactly solvable Kitaev model ($J=\tilde J$). Our model can be applied to
+layered Mott insulators A$_2$IrO$_3$ (A=Li, Na). For a monolayer of
+Li$_2$IrO$_3$, we show that it is possible to tune the controlling parameter
+into the Kitaev spin liquid regime by a link-dependent Rashba spin-orbital
+coupling.",1202.1610v5
+2004-09-02,Black-hole ejecta by frame-dragging along the axis of rotation,"An energy $E=\omega J$ is derived for gravitational spin-orbit coupling by
+frame-dragging $\omega$ acting on angular momentum $J$. This interaction
+defines a no-boundary mechanism for linear acceleration of magnetized matter
+along the axis of rotation of black holes. We explain GRB030329/SN2003dh by
+centered nucleation of a high-mass black hole with rapid rotation, producing
+baryon-poor ejecta by gravitational spin-orbit coupling. The duration of the
+burst is attributed to spin-down in the emission of gravitational-waves by a
+surrounding non-axisymmetric torus.",0409062v1
+1999-11-22,The role of spin-orbit coupling for the superconducting state in Sr_2RuO_4,"The odd-parity spin-triplet Cooper pairing states show a six-fold degeneracy
+for a quasi-two-dimensional electron system. In this article we show how
+spin-orbit coupling can lift this degeneracy for Sr_2RuO_4 taking the band
+structure based on the three relevant t_{2g}-orbitals of the Ru-ions into
+account. The stabilized state depends on the relative strength of the pairing
+interaction. We show that under reasonable assumptions the chiral pairing state
+d(k) = z(k_x +/- i k_y) is favored against the others.",9911325v1
+2000-01-27,Skyrmion Strings and Anomalous Hall Effect in Double Exchange Systems,"We perform Monte Carlo simulations to obtain quantitative results for the
+anomalous Hall resistance, R_A, observed in colossal magnetoresistance
+manganites. R_A arises from the interaction between the spin magnetization and
+topological defects via spin-orbit coupling. We study these defects and how
+they are affected by the spin-orbit coupling within the framework of the double
+exchange model. The obtained anomalous Hall resistance is, in sign, order of
+magnitude and shape, in agreement with experimental data.",0001404v1
+2000-12-12,Loss of the magnetism in FeS,"It is argued that the formation of the non-magnetic state of FeS in external
+pressures above 6.5 GPa is in agreement with the prediction of the quantum
+atomistic solid-state theory, an extension of the crystal-field theory with the
+spin-orbit coupling incorporated, and is related with the change of sign of the
+off-cubic trigonal distortion marked by the change of the c/a ratio from >1.63
+(magnetic) to <1.63 (non-magnetic). Keywords: highly-correlated electron
+system, crystal field, low-spin state, Fe2+ ion, spin-orbit coupling",0012196v1
+2001-10-17,Spin-orbit coupling and ESR theory for carbon nanotubes,"A theoretical description of ESR in 1D interacting metals is given, with
+primary emphasis on carbon nanotubes. The spin-orbit coupling is derived, and
+the resulting ESR spectrum is analyzed by field theory and exact
+diagonalization. Drastic differences in the ESR spectra of single-wall and
+multi-wall nanotubes are found. For single-wall tubes, the predicted double
+peak spectrum could reveal spin-charge separation.",0110352v2
+2005-01-24,Criterion for weak spin-orbit coupling in heavy-fermion superconductivity: A numerical renormalization-group study,"A criterion for effective irrelevancy of the spin-orbit coupling in the
+heavy-fermion superconductivity is discussed on the basis of the impurity
+Anderson model with two sets of Kramers doublets. Using Wilson's numerical
+renormalization-group method, we demonstrate a formation of the quasiparticle
+as well as the renormalization of the rotational symmetry-breaking interaction
+in the lower Kramers doublet (quasispin) space. A comparison with the quasispin
+conserving interaction exhibits the effective irrelevancy of the
+symmetry-breaking interaction for the splitting of two doublets Delta larger
+than the characteristic energy of the local spin fluctuation T_K. The formula
+for the ratio of two interactions is also determined.",0501560v1
+2005-01-26,Conductance Fluctuations and Spin Symmetries in Quantum Dots,"Conductance fluctuations in GaAs quantum dots with spin-orbit and Zeeman
+coupling are investigated experimentally and compared to a random matrix theory
+formulation that defines a number of regimes of spin symmetry depending on
+experimental parameters. Accounting for orbital coupling of the in-plane
+magnetic field, which can break time-reversal symmetry, yields excellent
+overall agreement between experiment and theory.",0501622v2
+2005-08-19,Trapping of Quantized Electrical Charge in Superfluid 3He-B via the Electrodynamics of Spin-orbit Coupled Systems,"Exploiting analogies between spin-orbit coupled spin superfluids and
+non-Abelian Yang-Mills theory, we argue that machines can be built capable of
+trapping a quantized amount of electric linear charge density, while the line
+charge quantum itself is surprisingly large. The required conditions might well
+hold in superfluid 3He-B, for which we propose an experimental realization of
+this phenomenon.",0508481v1
+2006-05-06,Light Induced Hall effect in semiconductors with spin-orbit coupling,"We show that optically excited electrons by a circularly polarized light in a
+semiconductor with spin-orbit coupling subject to a weak electric field will
+carry a Hall current transverse to the electric field. This light induced Hall
+effect is a result of quantum interference of the light and the electric field,
+and can be viewed as a physical consequence of the spin current induced by the
+electric field. The light induced Hall conductance is calculated for the p-type
+GaAs bulk material, and the n-type and p-type quantum well structures.",0605159v1
+2006-09-05,Weak localization correction to the density of transmission eigenvalues in the presence of magnetic field and spin-orbit coupling for a chaotic quantum dot,"We calculated the weak localization correction to the density of the
+transmission eigenvalues in the case of chaotic quantum dots in the framework
+of Random Matrix Theory including the parametric dependence on the magnetic
+field and spin-orbit coupling. The result is interpreted in terms of spin
+singlet and triplet Cooperon modes of conventional diagrammatic perturbation
+theory. As simple applications, we obtained the weak localization correction to
+the conductance, the shot noise power and the third cumulant of the
+distribution of the transmitted charge.",0609086v1
+2007-03-30,Enhanced triplet superconductivity in noncentrosymmetric systems,"We study pairing symmetry of noncentrosymmetric superconductors based on the
+extended Hubbard model on square lattice near half-filling, using the random
+phase approximation. We show that d+f-wave pairing is favored and the triplet
+f-wave state is enhanced by Rashba type spin-orbit coupling originating from
+the broken inversion symmetry. The enhanced triplet superconductivity stems
+from the increase of the effective interaction for the triplet pairing and the
+reduction of the spin susceptibility caused by the Rashba type spin-orbit
+coupling which lead to the increase of the triplet component and the
+destruction of the singlet one, respectively.",0703809v1
+2004-11-17,Solution of a Hamiltonian of quantum dots with Rashba spin-orbit coupling: quasi-exact solution,"We present a method to solve the problem of Rashba spin-orbit coupling in
+semiconductor quantum dots, within the context of quasi-exactly solvable
+spectral problems. We show that the problem possesses a hidden osp(2,2)
+superalgebra. We constructed a general matrix whose determinant provide exact
+eigenvalues. Analogous mathematical structures between the Rashba and some of
+the other spin-boson physical systems are notified.",0411124v1
+2007-08-22,Spin orbit interaction and zitterbewegung in symmetric wells,"Recently, we have introduced a novel inter-subband-induced spin-orbit (s-o)
+coupling [Phys. Rev. Lett. 99, 076603 (2007); cond-mat/0607218] arising in
+\textit{symmetric} wells with at least two subbands. This new s-o coupling
+gives rise to an usual zitterbewegung -- i.e. the semiconductor analog to the
+relativistic trembling motion of electrons -- with cycloidal motion without
+magnetic fields. Here we complement these findings by explicitly deriving
+expressions for the corresponding zitterbewegung in spin space.",0708.3091v1
+2007-11-21,Anomalous Hall effect in a two dimensional electron gas with magnetic impurities,"Magnetic impurities play an important role in many spintronics-related
+materials. Motivated by this fact, we study the anomalous Hall effect in the
+presence of magnetic impurities, focusing on two-dimensional electron systems
+with Rashba spin-orbit coupling. We find a highly nonlinear dependence on the
+impurity polarization, including possible sign changes. At small impurity
+magnetizations, this is a consequence of the remarkable result that the linear
+term is independent of the spin-orbit coupling strength. Near saturation of the
+impurity spins, the anomalous Hall conductivity can be resonantly enhanced, due
+to interference between potential and magnetic scattering.",0711.3415v1
+2009-02-12,Kondo effect in transport through Aharonov-Bohm and Aharonov-Casher interferometers,"We derive the extension of the Hubbard model to include Rashba spin-orbit
+coupling that correctly describes Aharonov-Bohm and Aharonov-Casher phases in a
+ring under applied magnetic and electric fields. When the ring is connected to
+conducting leads, we develop a formalism that is able to describe both, Kondo
+and interference effects. We find that in the Kondo regime, the spin-orbit
+coupling reduces strongly the conductance from the unitary limit. This effect
+in combination with the magnetic flux, can be used to produce spin polarized
+carriers.",0902.2200v1
+2011-10-11,Unconventional superfluidity induced by spin-orbital coupling in a polarized two-dimensional Fermi gas,"We show the spin-orbital coupling induced by an artificial light-induced
+gauge field can fully restore superfluidity suppressed by population imbalance
+in a two-dimensional (2D) Fermi gas, leading to unconventional superfluid
+states either with topological Majorana fermion excitations or showing a novel
+mixture of triplet pairing with spin-up (down) components respectively in the
+$p_{x}\pm ip_{y}$ pairing channels. We self-consistently calculate the zero
+temperature phase diagram at the BCS\ side of Feshbach resonance and show that
+the phase transitions between different superfluid states can be revealed
+through measurement of the in-situ density profile of the 2D atomic cloud in a
+weak global trap.",1110.2241v1
+2012-07-25,Magnetotransport effects in polar versus non-polar SrTiO3 based heterostructures,"Anisotropic magnetoresistance and negative magnetoresistance for in-plane
+fields are compared for the LaAlO3 /SrTiO3 interface and the symmetric Nb-doped
+SrTiO3 heterostructure. Both effects are exceptionally strong in LaAlO3 /SrTiO3
+. We analyze their temperature, magnetic field and gate voltage dependencies
+and find them to arise from a Rashba type spin-orbit coupling with magnetic
+scatterers that have two contributions to their potential: spin exchange and
+Coulomb interaction. Atomic spin-orbit coupling is sufficient to explain the
+small effects observed in Nb-doped SrTiO3 . These results clarify contradicting
+transport interpretations in SrTiO3 -based heterostructures.",1207.6057v1
+2012-08-30,Composite fermion state of spin-orbit coupled bosons,"We consider spinor Bose gas with the isotropic Rashba spin-orbit coupling in
+2D. We argue that at low density its groundstate is a composite fermion state
+with a Chern-Simons gauge field and filling factor one. The chemical potential
+of such a state scales with the density as \mu \propto n^{3/2}. This is a lower
+energy per particle than \mu \propto n for the earlier suggested groundstate
+candidates: a condensate with broken time-reversal symmetry and a spin density
+wave state.",1208.6266v1
+2013-04-18,Spontaneous ferromagnetism in the spinor Bose gas with Rashba spin-orbit coupling,"We show that in the two-component Bose gas with Rashba spin-orbit coupling an
+arbitrarily small attractive interaction between bosons with opposite spin
+induces spontaneous ferromagnetism below a finite critical temperature $T_c$.
+In the ferromagnetic phase the single-particle spectrum exhibits a unique
+minimum in momentum space in the direction of the magnetization. For
+sufficiently small temperatures below $T_c$ the bosons eventually condense into
+the unique state at the bottom of the spectrum, forming a ferromagnetic
+Bose-Einstein condensate.",1304.5103v2
+2014-10-13,Topological properties of the bond-modulated honeycomb lattice,"We study the combined effects of lattice deformation, e-e interaction and
+spin-orbit coupling in a two-dimensional (2D) honeycomb lattice. We adopt
+different kinds of hopping modulation--generalized dimerization and a Kekule
+distortion--and calculate topological invariants for the non-interacting system
+and for the interacting system. We identify the parameter range (Hubbard U,
+hopping modulation, spin-orbit coupling) where the 2D system behaves as a
+trivial insulator or Quantum Spin Hall Insulator.",1410.3411v2
+2014-12-09,Spin-dependent thermoelectric properties of a Kondo-correlated quantum dot with Rashba spin-orbit coupling,"Thermoelectric transport phenomena in a single-level quantum dot coupled to
+ferromagnetic leads are considered theoretically in the Kondo regime. The dot
+is described by the Anderson model with Rashba type spin-orbit interaction. The
+finite-U mean field slave boson technique is used to describe the transport
+characteristics, like heat conductance, thermopower, thermoelectric efficiency
+(figure of merit). The role of quantum interference effects in thermoelectric
+parameters is also analyzed.",1412.2921v1
+2015-03-03,Tuning the Chern number and Berry curvature with spin-orbit coupling and magnetic textures,"We obtain the band structure of a particle moving in a magnetic spin texture,
+classified by its chirality and structure factor, in the presence of spin-orbit
+coupling. This rich interplay leads to a variety of novel topological phases
+characterized by the Berry curvature and their associated Chern numbers. We
+suggest methods of experimentally exploring these topological phases by Hall
+drift measurements of the Chern number and Berry phase interferometry to map
+the Berry curvature.",1503.01164v1
+2016-03-07,Spin-orbit coupled correlated metal phase in Kondo lattices: an implementation with alkaline-earth atoms,"We show that an interplay between quantum effects, strong on-site
+ferromagnetic exchange interaction and antiferromagnetic correlations in Kondo
+lattices can give rise to an exotic spin-orbit coupled metallic state in
+regimes where classical treatments predict a trivial insulating behavior. This
+phenomenon can be simulated with ultracold alkaline-earth fermionic atoms
+subject to a laser-induced magnetic field by observing dynamics of spin-charge
+excitations in quench experiments.",1603.01946v4
+2016-07-18,Exotic Topological States with Raman-Induced Spin-Orbit Coupling,"We propose a simple experimental scheme to realize simultaneously the
+one-dimensional spin-orbit coupling and the staggered spin-flip in ultracold
+pseudospin-$1/2$ atomic Fermi gases trapped in square optical lattices. In the
+absence of interspecies interactions, the system supports gapped Chern
+insulators and gapless topological semimetal states. By turning on the $s$-wave
+interactions, a rich variety of gapped and gapless inhomogeneous topological
+superfluids can emerge. In particular, a gapped topological Fulde-Ferrell
+superfluid, in which the chiral edge states at opposite boundaries possess the
+same chirality, is predicted.",1607.05109v2
+2017-02-14,Interference effects and Huygens' principle in transverse magnetic focusing of electrons and holes,"Interference effects form a fundamental pillar of quantum mechanics. In this
+paper, we examine the interference in spin-orbit coupled transverse magnetic
+focusing, where a weak magnetic field is used to focus charge carries over
+mesoscopic scales. We determine a semi-classical form for the Green's function
+in a weak magnetic field, for the case of both spin-less and spin-orbit coupled
+charge carriers. The obtained forms for the Greens' function are independent of
+particle dispersion and are thus applicable to a wide variety of systems.",1702.04425v1
+2011-11-28,Crystallized merons and inverted merons in the condensation of spin-1 Bose gases with spin-orbit coupling,"The non-equilibrium dynamics of a rapidly quenched spin-1 Bose gas with
+spin-orbit coupling is studied. By solving the stochastic projected
+Gross-Pitaevskii equation, we show that crystallization of merons can occur in
+a spinor condensate of ^{87}Rb. Analytic form and stability of the crystal
+structure are given. Likewise, inverted merons can be created in a
+spin-polarized spinor condensate of ^{23}Na. Our studies provide a chance to
+explore the fundamental properties of meron-like matter.",1111.6338v2
+2015-12-02,Two dipolar atoms in a harmonic trap,"Two identical dipolar atoms moving in a harmonic trap without an external
+magnetic field are investigated. Using the algebra of angular momentum a semi -
+analytical solutions are found. We show that the internal spin - spin
+interactions between the atoms couple to the orbital angular momentum causing
+an analogue of Einstein - de Haas effect. We show a possibility of
+adiabatically pumping our system from the s-wave to the d-wave relative motion.
+The effective spin-orbit coupling occurs at anti-crossings of the energy
+levels.",1512.00631v2
+2017-07-06,"Computation of unitary group for the Rashba spin-orbit coupled operator, with application to point-interactions","We compute an explicit formula for the one-parameter unitary group of the
+single-particle Rashba spin-orbit coupled operator in dimension three. As an
+application, we derive the formula for the Green function for the two-particle
+operator, and then prove that the spin-dependent point-interaction is of class
+$\mathcal{H}_{-4}$. The latter is thus the example of a supersingular
+perturbation for which no self-adjoint operator can be constructed.",1707.01824v1
+2017-10-11,Ultra-cold Collisions between Spin-Orbit-Coupled Dipoles: General Formalism and Universality,"A theoretical study of the low-energy scattering properties of two aligned
+identical bosonic and fermionic dipoles in the presence of isotropic spin-orbit
+coupling (SOC) is presented. A general treatment of particles with arbitrary
+(pseudo-) spin is given in the framework of multi-channel scattering. At
+ultracold temperatures and away from shape resonances or closed-channel
+dominated resonances, the cross-section can be well described within the Born
+approximation to within corrections due to the s-wave scattering. We compare
+our findings with numerical calculations and find excellent agreement.",1710.03901v2
+2019-08-23,Strong antisymmetric spin-orbit coupling and superconducting properties: The case of noncentrosymmetric LaPtSi,"In this work we aim to analyze the effect of a strong antisymmetric
+spin-orbit coupling (ASOC) on superconductivity of noncentrosymmetric LaPtSi.
+We study the energy gap structure of polycrystalline LaPtSi by using magnetic
+penetration depth measurements down to 0.02$T_c$. We observed a dirty s-wave
+behavior, which provides compelling evidence that the spin-singlet component of
+the mixed pairing state is highly dominant. This is consistent with previous
+results in the sense that the mere presence of a strong ASOC does not lead to
+unconventional behaviors. Our result also downplays LaPtSi as a good candidate
+for realizing time-reversal invariant topological superconductivity.",1908.08828v1
+2020-08-22,Pseudospin resonances reveal synthetic spin-orbit interaction,"We investigate a spin-full double quantum dot (DQD) coupled to the leads in a
+pseudospin valve configuration. The interplay of interaction and interference
+produces in the stability diagram a rich variety of resonances, modulated by
+the system parameters. In presence of ferromagnetic leads and pseudospin
+anisotropy, those resonances split, turn into dips and acquire a Fano shape
+thus revealing a synthetic spin-orbit coupling induced on the DQD. A set of
+rate equations derived for a minimal model captures those features. The model
+accurately matches the numerical results obtained for the full system in the
+framework of a generalized master equation and calculated within the
+cotunneling approximation.",2008.09857v1
+2021-11-11,Spin-Orbit Coupling in Transition Metal Dichalcogenide Heterobilayer Flat Bands,"The valence flat bands in transition metal dichalcogenide (TMD)
+heterobilayers are shown to exhibit strong intralayer spin-orbit coupling. This
+is reflected in a simple tight-binding model with spin-dependent complex
+hoppings based on the continuum model. A perpendicular electric field causes
+interlayer hybridization, such that the effective model is equivalent to the
+Kane-Mele model of topological insulators. The proposed model can be used as a
+starting point to understand interactions and the experimentally observed
+topological phases.",2111.06208v1
+2021-12-07,Bogoliubov spectrum and the dynamic structure factor in a quasi-two-dimensional spin-orbit coupled BEC,"We compute the the Bogoliubov-de-Gennes excitation spectrum in a trapped
+two-component spin-orbit-coupled (SOC) Bose-Einstein condensate (BEC) in
+quasi-two-dimensions as a function of linear and angular momentum and analyse
+them. The excitation spectrum exhibits a minima-like feature at finite momentum
+for the immiscible SOC-BEC configuration. We augment these results by computing
+the dynamic structure factor in the density and pseudo-spin sector, and discuss
+its interesting features that can be experimentally measured through Bragg
+spectroscopy of such ultra cold-condensate.",2112.03505v1
+2023-08-28,Anomalous Zeeman effect in SrTiO3 and its possible all-electric detection,"We show that the interplay between spin-orbit coupling and cubic symmetry
+breaking in SrTiO3 results in a highly anomalous Zeeman effect of conduction
+electrons substantially different among the three conduction sub-bands and
+strongly dependent on their splitting. This effect can be measured via
+electrically-driven spin resonance enabled by the interplay between electron
+hopping and spin-orbit coupling, and enhanced by the near-degeneracy of the
+conduction sub-bands. The proposed effects can provide a unique insight into
+the electronic properties of SrTiO3 and its heterostructures.",2308.14592v2
+2004-03-12,Consequences of spin-orbit coupling for the Bose-Einstein condensation of magnons,"In the first part we discuss how the BEC picture for magnons is modified by
+anisotropies induced by spin-orbit coupling. In particular we focus on the
+effects of antisymmetric spin interactions and/or a staggered component of the
+$g$ (gyromagnetic) tensor. Such terms lead to a gapped quasiparticle spectrum
+and a nonzero condensate density for all temperatures so that no phase
+transition occurs. We contrast this to the effect of crystal field anisotropies
+which are also induced by spin-orbit coupling. In the second part we study the
+field-induced magnetic ordering in TlCuCl$_3$ on a quantitative level. We show
+that the usual BEC picture does not allow for a good description of the
+experimental magnetisation data and argue that antisymmetric spin interactions
+and/or a staggered $g$ tensor component are still crucial, although both are
+expected to be tiny in this compound due to crystal symmetries. Including this
+type of interaction we obtain excellent agreement with experimental data.",0403311v2
+2006-02-28,Photon-assisted electron transmission resonance through a quantum well with spin-orbit coupling,"Using the effective-mass approximation and Floquet theory, we study the
+electron transmission over a quantum well in semiconductor heterostructures
+with Dresselhaus spin-orbit coupling and an applied oscillation field. It is
+demonstrated by the numerical evaluations that Dresselhaus spin-orbit coupling
+eliminates the spin degeneracy and leads to the splitting of asymmetric
+Fano-type resonance peaks in the conductivity. In turn, the splitting of
+Fano-type resonance induces the spin- polarization-dependent electron-current.
+The location and line shape of Fano-type resonance can be controlled by
+adjusting the oscillation frequency and the amplitude of external field as
+well. These interesting features may be a very useful basis for devising
+tunable spin filters.",0602658v1
+2007-09-10,Weak antilocalization in high mobility Ga(x)In(1-x)As/InP two-dimensional electron gases with strong spin-orbit coupling,"We have studied the spin-orbit interaction in a high mobility two-dimensional
+electron gas in a GaInAs/InP heterostructure as a function of an applied gate
+voltage as well as a function of temperature. Highly sensitive magnetotransport
+measurements of weak antilocalization as well as measurements of Shubnikov--de
+Haas oscillations were performed in a wide range of electron sheet
+concentrations. In our samples the electron transport takes place in the strong
+spin precession regime in the whole range of applied gate voltages, which is
+characterized by the spin precession length being shorter than the elastic mean
+free path. The magnitude of the Rashba spin-orbit coupling parameter was
+determined by fitting the experimental curves by a simulated quantum
+conductance correction according to a model proposed recently by Golub [Phys.
+Rev. B 71, 235310 (2005)]. A comparison of the Rashba coupling parameter
+extracted using this model with the values estimated from the analysis of the
+beating pattern in the Shubnikov--de Haas oscillations showed a good agreement.",0709.1326v1
+2009-11-04,Features due to spin-orbit coupling in the optical conductivity of single-layer graphene,"We have calculated the optical conductivity of a disorder-free single
+graphene sheet in the presence of spin-orbit coupling, using the Kubo
+formalism. Both intrinsic and structural-inversion-asymmetry induced types of
+spin splitting are considered within a low-energy continuum theory. Analytical
+results are obtained that allow us to identify distinct features arising from
+spin-orbit couplings. We point out how optical-conductivity measurements could
+offer a way to determine the strengths of spin splitting due to various origins
+in graphene.",0911.0754v2
+2010-02-16,"Orbital Ordering and Unfrustrated $(π,0)$ Magnetism from Degenerate Double Exchange in the Iron Pnictides","The magnetic excitations of the iron pnictides are explained within a
+degenerate double-exchange model. The local-moment spins are coupled by
+superexchanges $J_1$ and $J_2$ between nearest and next-nearest neighbors,
+respectively, and interact with the itinerant electrons of the degenerate
+$d_{xz}$ and $d_{yz}$ orbitals via a ferromagnetic Hund exchange. The latter
+stabilizes $(\pi,0)$ stripe antiferromagnetism due to emergent ferro-orbital
+order and the resulting kinetic energy gain by hopping preferably along the
+ferromagnetic spin direction. Taking the quantum nature of the spins into
+account, we calculate the magnetic excitation spectra in the presence of both,
+super- and double-exchange. A dramatic increase of the spin-wave energies at
+the competing N\'eel ordering wave vector is found, in agreement with recent
+neutron scattering data. The spectra are fitted to a spin-only model with a
+strong spatial anisotropy and additional longer ranged couplings along the
+ferromagnetic chains. Over a realistic parameter range, the effective couplings
+along the chains are negative corresponding to unfrustrated stripe
+antiferromagnetism.",1002.3165v3
+2010-11-16,Development in the Scattering Matrix Theory: From Spin-Orbit-Coupling Affected Shot Noise to Quantum Pumping,"The review chapter starts by a pedagogical introduction to the general
+concept of the scattering theory: from the fundamental wave-function picture to
+the second-quantization language, with the aim to clear possible ambiguity in
+conventional textbooks. Recent progress in applying the method to current
+fluctuations and oscillating-parameter driven quantum pumping processes is
+presented with inclusion of contributions by B\""{u}ttiker, Brouwer, Moskalets,
+Zhu, etc. In particular, the spin-orbit-coupling affected shot noise can be
+dealt with by taking into account the spin-dependent scattering processes. A
+large shot noise suppression with the Fano factor below 0.5 observed
+experimentally can be illustrated by effective repulsion between electrons with
+antiparallel spin induced by the Dresselhaus spin-orbit coupling effect. A
+Floquet scattering theory for quantum-mechanical pumping in mesoscopic
+conductors is developed by Moskalets et al., which gives a general picture of
+quantum pumping phenomenon, from adiabatic to non-adiabatic and from weak
+pumping to strong pumping.",1011.3603v1
+2012-03-28,Interplay of spin-orbit coupling and Zeeman splitting in the absorption lineshape of 2D fermions,"We suggest that electron spin resonance (ESR) experiment can be used as a
+probe of spinon excitations of hypothetical spin-liquid state of frustrated
+antiferromagnet in the presence of asymmetric Dzyaloshinskii-Moriya (DM)
+interaction. We describe assumptions under which the ESR response is reduced to
+the response of 2D electron gas with Rashba spin-orbit coupling. Unlike
+previous treatments, the spin-orbit coupling, \Delta_{SO}, is not assumed small
+compared to the Zeeman splitting, \Delta_Z. We demonstrate that ESR response
+diverges at the edges of the absorption spectrum for ac magnetic field
+perpendicular to the static field. At the compensation point,
+\Delta_{SO}\approx \Delta_Z, the broad absorption spectrum exhibits features
+that evolve with temperature, T, even when T is comparable to the Fermi energy.",1203.6118v2
+2013-01-07,Parity violating superfluidity in ultra-cold fermions under the influence of artificial non-Abelian gauge fields,"We discuss the creation of parity violating Fermi superfluids in the presence
+of non-Abelian gauge fields involving spin-orbit coupling and crossed Zeeman
+fields. We focus on spin-orbit coupling with equal Rashba and Dresselhaus (ERD)
+strengths which has been realized experimentally in ultra-cold atoms, but we
+also discuss the case of arbitrary mixing of Rashba and Dresselhaus (RD) and of
+Rashba-only (RO) spin-orbit coupling. To illustrate the emergence of parity
+violation in the superfluid, we analyze first the excitation spectrum in the
+normal state and show that the generalized helicity bands do not have inversion
+symmetry in momentum space when crossed Zeeman fields are present. This is also
+reflected in the superfluid phase, where the order parameter tensor in the
+generalized helicity basis violates parity. However, the pairing fields in
+singlet and triplet channels of the generalized helicity basis are still parity
+even and odd, respectively. Parity violation is further reflected on ground
+state properties such as the spin-resolved momentum distribution, and in
+excitation properties such as the spin-dependent spectral function and density
+of states.",1301.1353v1
+2013-01-18,Current induced torques and interfacial spin-orbit coupling: Semiclassical Modeling,"In bilayer nanowires consisting of a ferromagnetic layer and a non-magnetic
+layer with strong spin-orbit coupling, currents create torques on the
+magnetization beyond those found in simple ferromagnetic nanowires. The
+resulting magnetic dynamics appear to require torques that can be separated
+into two terms, damping-like and field-like. The damping-like torque is
+typically derived from models describing the bulk spin Hall effect and the spin
+transfer torque, and the field-like torque is typically derived from a Rashba
+model describing interfacial spin-orbit coupling. We derive a model based on
+the Boltzmann equation that unifies these approaches. We also consider an
+approximation to the Boltzmann equation, the drift-diffusion model, that
+qualitatively reproduces the behavior, but quantitatively fails to reproduce
+the results. We show that the Boltzmann equation with physically reasonable
+parameters can match the torques for any particular sample, but in some cases,
+it fails to describe the experimentally observed thickness dependences.",1301.4513v1
+2013-01-28,Magnetic Impurity Affected by Spin-Orbit Coupling: Behavior near a Topological Phase Transition,"We investigate the effect of spin-orbit coupling on the behavior of magnetic
+impurity at the edge of a zigzag graphene ribbon by means of quantum Monte
+Carlo simulations. A peculiar interplay of Kane-Mele type spin-orbit and
+impurity-host coupling is found to affect local properties such as the impurity
+magnetic moment and spectral densities. The special helical nature of the
+topological insulator on the edge is found to affect nonlocal quantities, such
+as the two-particle and spin-spin correlation functions linking electrons on
+the impurity with those in the conduction band.",1301.6501v2
+2013-04-09,Ground-state phase diagram and critical temperature of two-component Bose gases with Rashba spin-orbit coupling,"Ground-state phase diagram of two-component Bose gases with Rashba spin-orbit
+coupling is determined via a variational approach. A phase in which the fully
+polarized condensate occupies zero momentum is identified. This zero-momentum
+phase competes with the spin density wave phase when interspecies interaction
+is stronger than intraspecies interaction, and the former one is always the
+ground state for weak spin-orbit coupling. When the energies of these two
+phases are close, there is a phase separation between them. At finite
+temperature, such a zero-momentum condensation can be induced by a
+ferromagnetic phase transition in normal state. The spontaneous spin
+polarization removes the degeneracy of quasiparticles' energy minima, and
+consequently the modified density of state accommodates a Bose condensation to
+appear below a critical temperature.",1304.2690v2
+2013-05-14,Quasiclassical Treatment and Odd-parity/Triplet Correspondence in Topological Superconductors,"We construct a quasiclassical framework for topological superconductors with
+the strong spin-orbit coupling such as CuxBi2Se3. In the manner of the
+quasiclassical treatment, decomposing the slowly varying component from the
+total quasi-particle wave function, the original massive Dirac Bogoliubov-de
+Gennes (BdG) Hamiltonian derived from the tight-binding model represented by 8
+x 8 matrix is reduced to 4 x 4 one. The resultant equations are equivalent to
+Andreev-type equations of singlet or triplet superconductors, in which the
+apparent spin-orbit coupling vanishes. Using this formalism, we find a fact
+that the odd-parity superconductivity in topological superconductors turns to
+the spin-triplet one. % without the spin-orbit coupling through the
+quasiclassical treatment. Moreover, in terms of the quasiclassical treatment,
+we show that the topologically-protected zero-energy states in topological
+superconductors has the correspondence to the Andreev bound states established
+in a long history of studies for the unconventional superconductors. This
+clearly indicates that low-energy non-trivial superconducting properties in the
+topological superconductors can be analyzed by the established theoretical
+descriptions on the spin-triplet superconductors.",1305.3025v2
+2014-04-03,Three-component Ultracold Fermi Gases with Spin-Orbit Coupling,"We investigate the pairing physics in a three-component Fermi-Fermi mixture,
+where a few impurities are immersed in a non-interacting spin-$\frac{1}{2}$
+Fermi gas with synthetic spin-orbit coupling (SOC), and interact attractively
+with one spin species in the Fermi gas. Due to the interplay of SOC and
+spin-selective interaction, the molecular state intrinsically acquires a
+non-zero center-of-mass momentum, which results in a new type of Fulde-Ferrell
+(FF) pairing in spin-orbit coupled Fermi systems. The existence of the Fermi
+sea can also lead to the competition between FF-like molecular states with
+different center-of-mass momenta, which corresponds to a first-order transition
+between FF phases in the thermodynamic limit. As the interaction strength is
+tuned, a polaron-molecule transition occurs in the highly imbalanced system,
+where the boundary varies non-monotonically with SOC parameters and gives rise
+to the reentrance of polaron states. The rich physics in this system can be
+probed using existing experimental techniques.",1404.0756v4
+2015-03-11,Giant Triplet Proximity Effect in $π$-biased Josephson Junctions with Spin-Orbit Coupling,"In diffusive Josephson junctions the phase-difference $\phi$ between the
+superconductors strongly influences the spectroscopic features of the layer
+separating them. The observation of a uniform minigap and its phase modulation
+were only recently experimentally reported, demonstrating agreement with
+theoretical predictions up to now - a vanishing minigap at $\phi=\pi$.
+Remarkably, we find that in the presence of intrinsic spin-orbit coupling a
+giant proximity effect due to spin-triplet Cooper pairs can develop at
+$\phi=\pi$, in complete contrast to the suppressed proximity effect without
+spin-orbit coupling. We here report a combined numerical and analytical study
+of this effect, proving its presence solely based on symmetry arguments, which
+makes it independent of the specific parameters used in experiments. We show
+that the spectroscopic signature of the triplets is present throughout the
+entire ferromagnetic layer. Our finding offers a new way to artificially
+create, control and isolate spin-triplet superconductivity.",1503.03500v2
+2015-11-23,The Sagnac Effect in Optical Lattices with Laser-Assisted Tunneling,"We propose a scheme to realize the rotation sensing using optical lattices
+with laser-assisted tunneling. We demonstrate that the competition between the
+rotation and the spin-orbit coupling governs the spin-dependent response of the
+cyclotron dynamics of the spin-orbit coupled bosons. The Sagnac-type cumulative
+phase can be read out from the envelop of a beat-frequency particle current in
+the spin-balanced system and enhanced by the cyclotron motion. We also
+theoretically show that the sensitivity limit of the spin-orbit-coupled system
+to the rotational motion can reach 7*10^-8 rad s^-1 Hz^1/2.",1511.07197v3
+2016-03-08,Weak (anti)localization in tubular semiconductor nanowires with spin-orbit coupling,"We compute analytically the weak (anti)localization correction to the Drude
+conductivity for electrons in tubular semiconductor systems of zinc blende
+type. We include linear Rashba and Dresselhaus spin-orbit coupling (SOC) and
+compare wires of standard growth directions $\langle100\rangle$,
+$\langle111\rangle$, and $\langle110\rangle$. The motion on the
+quasi-two-dimensional surface is considered diffusive in both directions:
+transversal as well as along the cylinder axis. It is shown that Dresselhaus
+and Rashba SOC similarly affect the spin relaxation rates. For the
+$\langle110\rangle$ growth direction, the long-lived spin states are of helical
+nature. We detect a crossover from weak localization to weak anti-localization
+depending on spin-orbit coupling strength as well as dephasing and scattering
+rate. The theory is fitted to experimental data of an undoped
+$\langle111\rangle$ InAs nanowire device which exhibits a top-gate-controlled
+crossover from positive to negative magnetoconductivity. Thereby, we extract
+transport parameters where we quantify the distinct types of SOC individually.",1603.02495v3
+2013-09-17,Radical-pair model of magnetoreception with spin-orbit coupling,"The mechanism used by migratory birds to orientate themselves using the
+geomagnetic field is still a mystery in many species. The radical pair
+mechanism, in which very weak magnetic fields can influence certain types of
+spin-dependent chemical reactions, leading to biologically observable signals,
+has recently imposed itself as one of the most promising candidates for certain
+species. This is thanks both to its extreme sensitivity and its capacity to
+reproduce results from behavioral studies. Still, in order to gain a
+directional sensitivity, an anisotropic mechanism is needed. Recent proposals
+have explored the possibility that such an anisotropy is due to the
+electron-nucleus hyperfine interaction. In this work we explore a different
+possibility, in which the anisotropy is due to spin-orbit coupling between the
+electron spin and its angular momentum. We will show how a
+spin-orbit-coupling-based magnetic compass can have performances comparable
+with the usually-studied nuclear-hyperfine based mechanism. Our results could
+thus help researchers actively looking for candidate biological molecules which
+may host magnetoreceptive functions, both to describe magnetoreception in birds
+as well as to develop artificial chemical compass systems.",1309.5882v1
+2014-06-19,Ring model for trapped condensates with synthetic spin-orbit coupling,"We derive an effective ring model in momentum space for trapped bosons with
+synthetic spin-orbit coupling. This effective model is characterized by a
+peculiar form of the inter particle interactions, which is crucially modified
+by the external confinement. The ring model allows for an intuitive
+understanding of the phase diagram of trapped condensates with isotropic
+spin-orbit coupling, and in particular for the existence of skyrmion lattice
+phases. The model, which may be generally applied for spinor condensates of
+arbitrary spin and spin-dependent interactions, is illustrated for the
+particular cases of spin-1/2 and spin-1 condensates.",1406.4938v5
+2016-12-05,Spatial compression of a particle state in a parabolic potential by spin measurements,"We propose a scheme for engineering compressed spatial states in a
+two-dimensional parabolic potential with a spin-orbit coupling by selective
+spin measurements. This sequence of measurements results in a
+coordinate-dependent density matrix with probability maxima achieved at a set
+of lines or at a two dimensional lattice. The resultant probability density
+depends on the spin-orbit coupling and the potential parameters and allows one
+to obtain a broad class of localized pure states on demand. The proposed scheme
+can be realized in spin-orbit coupled Bose-Einstein condensates.",1612.01588v1
+2019-10-08,Spatial coherence of spin-orbit-coupled Bose gases,"Spin-orbit-coupled Bose-Einstein condensates (SOBECs) exhibit two new phases
+of matter, now known as the stripe and plane-wave phases. When two interacting
+spin components of a SOBEC spatially overlap, density modulations with
+periodicity given by the spin-orbit coupling strength appear. In equilibrium,
+these components fully overlap in the miscible stripe phase, and overlap only
+in a domain wall in the immiscible plane-wave phase. Here we probe the density
+modulation present in any overlapping region with optical Bragg scattering, and
+observe the sudden drop of Bragg scattering as the overlapping region shrinks.
+Using an atomic analogue of the Talbot effect, we demonstrate the existence of
+long-range coherence between the different spin components in the stripe phase
+and surprisingly even in the phase-separated plane-wave phase.",1910.03613v1
+2020-01-19,Repulsive Fermi gases in a two-dimensional lattice with non-Abelian gauge fields,"Motivated by the recent experiment realizing bidirectional spin-orbit-coupled
+Bose-Einstein condensates (BEC), we theoretically explore the properties of
+repulsive fermions in the two-dimensional (2D) optical lattice with such
+non-Abelian gauge fields. Within the mean-field level, we find a novel phase of
+topological antiferromagnetic (TAFM) order which incorporates both the
+non-trivial topology due to spin-flip hopping and spontaneous symmetry breaking
+(SSB) for the in-plane spin order. We argue that the appearance of such a phase
+is generic for repulsive fermions in Chern bands achieved through spin-orbit
+coupling. Our work paves the way for further studies of fermionic
+generalization of 2D non-Abelian spin-orbit-coupled quantum gases.",2001.06757v1
+2021-01-20,Cubic spin-orbit coupling and anomalous Josephson effect in planar junctions,"Spin-orbit coupling in two-dimensional systems is usually characterized by
+Rashba and Dresselhaus spin-orbit coupling (SOC) linear in the wave vector.
+However, there is a growing class of materials which instead support dominant
+SOC cubic in the wave vector (cSOC), while their superconducting properties
+remain unexplored. By focusing on Josephson junctions in Zeeman field with
+superconductors separated by a normal cSOC region, we reveal a strongly
+anharmonic current-phase relation and complex spin structure. An experimental
+cSOC tunability enables both tunable anomalous phase shift and supercurrent,
+which flows even at the zero-phase difference in the junction. A fingerprint of
+cSOC in Josephson junctions is the f-wave spin-triplet superconducting
+correlations, important for superconducting spintronics and supporting Majorana
+bound states.",2101.08272v2
+2018-03-05,Néel- and Bloch-Type Magnetic Vortices in Rashba Metals,"We theoretically study noncoplanar spin textures in polar magnetic
+conductors. Starting from the Kondo lattice model with the Rashba spin-orbit
+coupling, we derive an effective spin model with generalized
+Ruderman-Kittel-Kasuya-Yosida interactions including the anisotropic and
+antisymmetric exchange interactions. By performing simulated annealing for the
+effective model, we find that a vortex crystal of N\'eel type is stabilized
+even in the absence of a magnetic field. Moreover, we demonstrate that a
+Bloch-type vortex crystal, which is usually associated with the Dresselhaus
+spin-orbit coupling, can also be realized in our Rashba-based model. A magnetic
+field turns the vortex crystals into N\'eel- and Bloch-type skyrmion-like
+crystals. Our results underscore that the interplay between the spin-orbit
+coupling and itinerant magnetism brings fertile possibilities of noncoplanar
+magnetic orderings.",1803.01543v1
+2018-03-07,Edge currents as a probe of the strongly spin-polarized topological noncentrosymmetric superconductors,"Recently the influence of antisymmetric spin-orbit coupling has been studied
+in novel topological superconductors such as half-Heuslers and artificial
+hetero-structures. We investigate the effect of Rashba and/or Dresselhaus
+spin-orbit couplings on the band structure and topological properties of a
+two-dimensional noncentrosymetric superconductor. For this goal, the
+topological helical edge modes are analyzed for different spin-orbit couplings
+as well as for several superconducting pairing symmetries. To explore the
+transport properties, we examine the response of the spin-polarized edge states
+to an exchange field in a superconductor-ferromagnet heterostructure. The
+broken chiral symmetry causes the uni-directional currents at opposite edges.",1803.02591v1
+2019-12-06,Topological superconducting phases and Josephson effect in curved time-reversal-invariant superconductors,"We consider a Rashba spin-orbit coupled nanowire with anisotropic
+spin-singlet superconducting pairing and time-reversal-invariant symmetry. We
+explore the evolution of the topological superconducting phases of this system
+due to geometric deformations for the representative case of a wire bent in a
+semielliptical shape. We find that when the system is in its topological
+superconducting phase, strong inhomogeneities in the profile curvature can
+produce a pair of localized eigenmodes, which can be attributed to a nonuniform
+topological phase. The curved geometric profile also allows to tune the spin
+correlations of the superconducting state via the induced inhomogeneity of the
+spin-orbit coupling (SOC). The geometric control of the superconducting pair
+correlations allows to manipulate the critical current in Josephson junctions
+made up of two time reversal invariant topological superconductors separated by
+a spin-orbit coupled normal metal. In particular, we find that the curvature
+inhomogeneity can be exploited for amplifying the current intensity, but also
+to generate a $0-\pi$ transition, and a second harmonic contribution, which
+generates, for some specific geometric configurations, a $\varphi$-junction
+behavior.",1912.03279v1
+2021-02-12,An Antisymmetric Berry Frictional Force At Equilibrium in the Presence of Spin-Orbit Coupling,"We analytically calculate the electronic friction tensor for a molecule near
+a metal surface in the case that the electronic Hamiltonian is complex-valued,
+e.g. the case that there is spin-orbit coupling and/or an external magnetic
+field. In such a case, even at equilibrium, we show that the friction tensor is
+not symmetric. Instead, the tensor is the real-valued sum of one positive
+definite tensor (corresponding to dissipation) plus one antisymmetric tensor
+(corresponding to a Berry pseudomagnetic force). Moreover, we find that this
+Berry force can be much larger than the dissipational force, suggesting the
+possibility of strongly spin-polarized chemicurrents or strongly spin-dependent
+rate constants for systems with spin-orbit coupling.",2102.06596v5
+2021-09-26,Spin-orbit-coupled spin-1 Bose-Einstein condensates in a toroidal trap: even-petal-number necklacelike state and persistent flow,"Spin-orbit coupling has novel spin-flip symmetries, a spin-1 spinor
+Bose-Einstein condensate owns meaningful interactions, and a toroidal trap is
+topologically nontrivial. We incorporate the three together and study the
+ground-state phase diagram in a Rashba spin-orbit-coupled spin-1 Bose-Einstein
+condensate with a toroidal trap. The spin-flip symmetries give rise to two
+different interesting phases: persistent flows with a unit phase winding
+difference between three components, and necklace states with even
+petal-number. The existing parameter regimes and properties of these phases are
+characterized by two-dimension numerical calculations and an azimuthal
+analytical one-dimension model.",2109.12529v1
+2022-10-04,Dissipative dynamics of an impurity with spin-orbit coupling,"Brownian motion of a mobile impurity in a bath is affected by spin-orbit
+coupling (SOC). Here, we discuss a Caldeira-Leggett-type model that can be used
+to propose and interpret quantum simulators of this problem in cold Bose gases.
+First, we derive a master equation that describes the model and explore it in a
+one-dimensional (1D) setting. To validate the standard assumptions needed for
+our derivation, we analyze available experimental data without SOC; as a
+byproduct, this analysis suggests that the quench dynamics of the impurity is
+beyond the 1D Bose-polaron approach at temperatures currently accessible in a
+cold-atom laboratory -- motion of the impurity is mainly driven by dissipation.
+For systems with SOC, we demonstrate that 1D spin-orbit coupling can be 'gauged
+out' even in the presence of dissipation -- the information about SOC is
+incorporated in the initial conditions. Observables sensitive to this
+information (such as spin densities) can be used to study formation of steady
+spin polarization domains during quench dynamics.",2210.01829v2
+2023-04-12,Phonon-Induced Collective Modes in Spin-Orbit Coupled Polar Metals,"We study the interplay between collective electronic and lattice modes in
+polar metals in an applied magnetic field aligned with the polar axis. Static
+spin-orbit coupling leads to the appearance of a particle-hole spin-flip
+continuum that is gapped at low energies in a finite field. We find that a weak
+spin-orbit assisted coupling between electrons and polar phonons induces the
+emergence of electronic collective modes. The strength of the applied magnetic
+field tunes the number of modes and their energies, which can lie both above
+and below the particle-hole continuum. For a range of field values, we identify
+Fano-like interference between the electronic continuum and phonons. We show
+that signatures of these collective modes can be observed in electron spin
+resonance experiments, and we provide the corresponding theoretical
+predictions.",2304.06083v2
+2023-08-07,Exciton-spin interactions in antiferromagnetic charge-transfer insulators,"We derive exciton-spin interactions from a microscopic correlated model that
+captures important aspects of the physics of charge-transfer (CT) insulators to
+address magnetism associated with exciton creation. We present a minimal model
+consisting of coupled clusters of transition metal d and ligand p orbitals that
+captures the essential features of the local atomic and electronic structure.
+First, we identify the lowest-energy state and optically allowed excited states
+within a cluster by applying the molecular orbital picture to the ligand p
+orbitals. Then, we derive the effective interactions between two clusters
+mediated by intercluster hoppings, which include exciton-spin couplings. The
+interplay of the correlations and the spatial structure of the CT exciton leads
+to strong magnetic exchange couplings with spatial anisotropy. Finally, we
+calculate an optical excitation spectrum in our effective model to obtain
+insights into magnetic sidebands optically observed in magnetic materials. We
+demonstrate that the spin-flip excitation due to the strongly enhanced local
+spin interactions around the exciton gives rise to the magnetic sidebands.",2308.03309v2
+2005-08-14,Consistency in Formulation of Spin Current and Torque Associated with a Variance of Angular Momentum,"Stimulated generally by recent interest in the novel spin Hall effect, the
+nonrelativistic quantum mechanical conserved currents, taken into account of
+spin-orbit coupling, are rigorously formulated based on the symmetries of
+system and Noether' theorem. The quantum mechanical force on the spin as well
+as the torque associated with the variance of angular momentum are obtained.
+Consequently, the kinetic interpretation of the variances of spin and orbit
+angular momentum currents implies a torque on the ""electric dipole"" associated
+with the moving spin. The bearing of the force and the torque on the properties
+of spin current in a two-dimensional electron gas with the Rashba spin-orbit
+interaction is discussed.",0508340v1
+2006-01-06,Coherent spin ratchets: A spin-orbit based quantum ratchet mechanism for spin-polarized currents in ballistic conductors,"We demonstrate that the combined effect of a spatially periodic potential,
+lateral confinement and spin-orbit interaction gives rise to a quantum ratchet
+mechanism for spin-polarized currents in two-dimensional coherent conductors.
+Upon adiabatic ac-driving, in the absence of a static bias, the system
+generates a directed spin current while the total charge current is zero. We
+analyze the underlying mechanism by employing symmetry properties of the
+scattering matrix and numerically verify the effect for different setups of
+ballistic conductors. The spin current direction can be changed upon tuning the
+Fermi energy or the strength of the Rashba spin-orbit coupling.",0601118v3
+2009-06-26,Nonlinear Spin-Charge Dynamics in a Driven Double Quantum Dot,"The coupled nonlinear coordinate and spin dynamics of an electron in a double
+quantum dot with spin-orbit interaction is studied semiclassically. The system
+is driven by an electric field with the frequency matching the orbital or the
+Zeeman resonance in magnetic field. Calculated evolution of the spin state is
+crucially sensitive to the irregularities in the spatial motion and the
+geometry of the host nanostructure. The resulting spin-flip Rabi frequency has
+an unusual dependence on the field amplitude, demonstrating approach to the
+chaotic spin motion. In turn, the orbital dynamics depends strongly on the spin
+evolution due to the spin-dependent term in the electron velocity.",0906.4854v1
+2012-10-13,Spin-flip transitions induced by time-dependent electric fields in surfaces with strong spin-orbit interaction,"We present a comprehensive theoretical investigation of the light absorption
+rate at the Pb/Ge(111) surface with strong spin-orbit coupling. Our
+calculations show that electron spin-flip transitions cause as much as 6% of
+the total light absorption, representing one order of magnitude enhancement
+over Rashba-like systems. Thus, it is demonstrated that a substantial part of
+the light irradiating this nominally non-magnetic surface is attenuated in spin
+flip processes. Remarkably, the spin-flip transition probability is structured
+in well defined hot spots within the Brillouin zone where the electron spin
+experiences a sudden 90 degree rotation. This mechanism offers the possibility
+of an experimental approach to the spin-orbit phenomena by optical means.",1210.4506v1
+2013-01-08,Evolution of the persistent spin helix in the presence of Hartree-Fock fields,"We derive a spin diffusion equation for a spin-orbit coupled two-dimensional
+electron gas including the Hartree-Fock field resulting from 1st order
+electron-electron interactions. We find that the lifetime of the persistent
+spin helix, which emerges for equal linear Rashba- and Dresselhaus spin-orbit
+interactions, can be enhanced considerably for large initial spin polarizations
+due to the Hartree-Fock field. The reason is a reduction of the
+symmetry-breaking cubic Dresselhaus scattering rate by the Hartree-Fock field.
+Also higher harmonics are generated and the polarization of the persistent spin
+helix rotates out of the (Sy,Sz)-plane acquiring a finite Sx-component. This
+effect becomes more pronounced, when the cubic Dresselhaus spin-orbit
+interaction is large.",1301.1662v1
+2013-04-28,Extrinsic spin Hall effect induced by resonant skew scattering in graphene,"We show that the extrinsic spin Hall effect can be engineered in monolayer
+graphene by decoration with small doses of adatoms, molecules, or nanoparticles
+originating local spin-orbit perturbations. The analysis of the single impurity
+scattering problem shows that intrinsic and Rashba spin-orbit local couplings
+enhance the spin Hall effect via skew scattering of charge carriers in the
+resonant regime. The solution of the transport equations for a random ensemble
+of spin-orbit impurities reveals that giant spin Hall currents are within the
+reach of the current state of the art in device fabrication. The spin Hall
+effect is robust with respect to thermal fluctuations and disorder averaging.",1304.7511v3
+2015-08-18,Charge-insensitive single-atom spin-orbit qubit in silicon,"High fidelity entanglement of an on-chip array of spin qubits poses many
+challenges. Spin-orbit coupling (SOC) can ease some of these challenges by
+enabling long-ranged entanglement via electric dipole-dipole interactions,
+microwave photons, or phonons. However, SOC exposes conventional spin qubits to
+decoherence from electrical noise. Here we propose an acceptor-based spin-orbit
+qubit in silicon offering long-range entanglement at a sweet spot where the
+qubit is protected from electrical noise. The qubit relies on quadrupolar SOC
+with the interface and gate potentials. As required for surface codes, $10^5$
+electrically mediated single-qubit and $10^4$ dipole-dipole mediated two-qubit
+gates are possible in the predicted spin lifetime. Moreover, circuit quantum
+electrodynamics with single spins is feasible, including dispersive readout,
+cavity-mediated entanglement, and spin-photon entanglement. An industrially
+relevant silicon-based platform is employed.",1508.04259v4
+2019-09-27,Observation of spin-orbit magnetoresistance in CoFeB/heavy metal/MgO with existence of both spin Hall effect and Edelstein effect,"In this paper, we report the observation of spin-orbit magnetoresistance
+(SOMR) in ferromagnetic metal/heavy metal/MgO system. We measure the
+magnetoresistance as the function of the thickness of heavy metal (HM) for
+CoFeB/HM/MgO and CoFeB/HM films where HM = Pt and Ta. Besides the conventional
+spin Hall magnetoresistance (SMR) peak, the evidence of the SOMR is indicated
+by another peak of the MR ratio when the thickness of HM is around 1 ~ 2 nm for
+CoFeB/HM/MgO films, which is absent for CoFeB/HM films. We speculate the SOMR
+observed in our experiment originates from the spin-orbit coupling at the
+HM/MgO interface. We give the boundary conditions of our samples and calculate
+the theoretical magnetoresistance based on spin diffusion equation. Based on
+the theoretical results, we can explain the two peaks we observe separately
+comes from the spin current generated by spin Hall effect and by Edelstein
+effect.",1909.12811v3
+2022-12-13,Josephson current via spin and orbital states of a tunable double quantum dot,"Supercurrent transport is experimentally studied in a Josephson junction
+hosting a double quantum dot (DQD) with tunable symmetries. The QDs are
+parallel-coupled to two superconducting contacts and can be tuned between
+strong inter-dot hybridization and a ring geometry where hybridization is
+suppressed. In both cases, we observe supercurrents when the two interacting
+orbitals are either empty or filled with spins, or a combination. However, when
+each QD hosts an unpaired spin, the supercurrent depends on the spin ground
+state. It is strongly suppressed for the ring geometry with a spin-triplet
+ground state at zero external magnetic field. By increasing the QD
+hybridization, we find that a supercurrent appears when the ground state
+changes to spin-singlet. In general, supercurrents are suppressed in cases of
+spin doublet ground state, but an exception occurs at orbital degeneracy when
+the system hosts one additional spin, as opposed to three, pointing to a broken
+particle-hole symmetry.",2212.06484v1
+2023-06-14,Multipolar spin liquid in an exactly solvable model for $j_\mathrm{eff} = \frac{3}{2}$ moments,"We study an exactly solvable model with bond-directional quadrupolar and
+octupolar interactions between spin-orbital entangled $j_{\mathrm{eff}} =
+\frac{3}{2}$ moments on the honeycomb lattice. We show that this model features
+a multipolar spin liquid phase with gapless fermionic excitations. In the
+presence of perturbations that break time-reversal and rotation symmetries, we
+find Abelian and non-Abelian topological phases in which the Chern number
+evaluates to $0$, $\pm 1$, and $\pm 2$. We also investigate quantum phase
+transitions out of the multipolar spin liquid using a parton mean-field
+approach and orbital wave theory. In the regime of strong
+integrability-breaking interactions, the multipolar spin liquid gives way to
+ferroquadrupolar-vortex and antiferro-octupolar ordered phases that harbor a
+hidden spin-$\frac{1}{2}$ Kitaev spin liquid. Our work unveils mechanisms for
+unusual multipolar orders and quantum spin liquids in Mott insulators with
+strong spin-orbit coupling.",2306.08624v2
+2022-02-23,Spin-orbit enabled all-electrical readout of chiral spin-textures,"Chirality and topology are intimately related fundamental concepts, which are
+heavily explored to establish spin-textures as potential magnetic bits in
+information technology. However, this ambition is inhibited since electrical
+reading of chiral attributes is highly non-trivial with conventional current
+perpendicular-to-plane (CPP) sensing devices. Here we demonstrate from
+extensive first-principles simulations and multiple scattering expansion the
+emergence of the chiral spin-mixing magnetoresistance (C-XMR) enabling highly
+efficient all-electrical readout of the chirality and helicity of respectively
+one- and two-dimensional magnetic states of matter. It is linear with
+spin-orbit coupling in contrast to the quadratic dependence associated with the
+newly unveiled non-local spin-mixing anisotropic MR (X-AMR). Such transport
+effects are systematised on various non-collinear magnetic states --
+spin-spirals and skyrmions -- and compared to the uncovered
+spin-orbit-independent multi-site magnetoresistances. Owing to their simple
+implementation in readily available reading devices, the proposed
+magnetoresistances offer exciting and decisive ingredients to explore with
+all-electrical means the rich physics of topological and chiral magnetic
+objects.",2202.11637v1
+2014-10-22,Spin dynamics of Mn impurities and their bound acceptors in GaAs,"We present results of tight-binding spin-dynamics simulations of individual
+and pairs of substitutional Mn impurities in GaAs. Our approach is based on the
+mixed quantum-classical scheme for spin dynamics, with coupled equations of
+motions for the quantum subsystem, representing the host, and the localized
+spins of magnetic dopants, which are treated classically. In the case of a
+single Mn impurity, we calculate explicitly the time evolution of the Mn spin
+and the spins of nearest-neighbors As atoms, where the acceptor (hole) state
+introduced by the Mn dopant resides. We relate the characteristic frequencies
+in the dynamical spectra to the two dominant energy scales of the system,
+namely the spin-orbit interaction strength and the value of the p-d exchange
+coupling between the impurity spin and the host carriers. For a pair of Mn
+impurities, we find signatures of the indirect (carrier-mediated) exchange
+interaction in the time evolution of the impurity spins. Finally, we examine
+temporal correlations between the two Mn spins and their dependence on the
+exchange coupling and spin-orbit interaction strength, as well as on the
+initial spin-configuration and separation between the impurities. Our results
+provide insight into the dynamic interaction between localized magnetic
+impurities in a nano-scaled magnetic-semiconductor sample, in the extremely
+dilute (solotronics) regime.",1410.5978v1
+2015-01-20,Spinning gravitating objects in the effective field theory in the post-Newtonian scheme,"We introduce a formulation for spinning gravitating objects in the effective
+field theory in the post-Newtonian scheme in the context of the binary inspiral
+problem. We aim at an effective action, where all field modes below the orbital
+scale are integrated out. We spell out the relevant degrees of freedom, in
+particular the rotational ones, and the associated symmetries. Building on
+these symmetries, we introduce the minimal coupling part of the point particle
+action in terms of gauge rotational variables, and construct the spin-induced
+nonminimal couplings, where we obtain the leading order couplings to all orders
+in spin. We specify the gauge for the rotational variables, where the
+unphysical degrees of freedom are eliminated already from the Feynman rules,
+and all the orbital field modes are integrated out. The equations of motion of
+the spin can be directly obtained via a proper variation of the action, and
+Hamiltonians may be straightforwardly derived. We implement this effective
+field theory for spin to derive all spin dependent potentials up to
+next-to-leading order to quadratic level in spin, namely up to the third
+post-Newtonian order for rapidly rotating compact objects. In particular, the
+proper next-to-leading order spin-squared potential and Hamiltonian for generic
+compact objects are also derived. For the implementations we use the
+nonrelativistic gravitational field decomposition, which is found here to
+eliminate higher-loop Feynman diagrams also in spin dependent sectors, and
+facilitates derivations. This formulation for spin is thus ideal for treatment
+of higher order spin dependent sectors.",1501.04956v3
+2021-09-09,Spin Texture in Doped Mott Insulators with Spin-Orbit Coupling,"A hole injected into a Mott insulator will gain an internal structure as
+recently identified by exact numerics, which is characterized by a nontrivial
+quantum number whose nature is of central importance in understanding the Mott
+physics. In this work, we show that a spin texture associated with such an
+internal degree of freedom can explicitly manifest after the spin degeneracy is
+lifted by a \emph{weak} Rashba spin-orbit coupling (SOC). It is described by an
+emergent angular momentum $J_{z}=\pm3/2$ as shown by both exact diagonalization
+(ED) and variational Monte Carlo (VMC) calculations, which are in good
+agreement with each other at a finite size. In particular, as the internal
+structure such a spin texture is generally present in the hole composite even
+at high excited energies, such that a corresponding texture in momentum space,
+extending deep inside the Brillouin zone, can be directly probed by the
+spin-polarized angle-resolved photoemission spectroscopy (ARPES). This is in
+contrast to a Landau quasiparticle under the SOC, in which the spin texture
+induced by SOC will not be protected once the excited energy is larger than the
+weak SOC coupling strength, away from the Fermi energy. We point out that the
+spin texture due to the SOC should be monotonically enhanced 1with reducing
+spin-spin correlation length in the superconducting/pseudogap phase at finite
+doping. A brief discussion of a recent experiment of the spin-polarized ARPES
+will be made.",2109.04492v2
+2021-12-14,Charge-spin interconversion in graphene-based systems from density functional theory,"We present a methodology to address, from first principles, charge-spin
+interconversion in two-dimensional materials with spin-orbit coupling. Our
+study relies on an implementation of density functional theory based quantum
+transport formalism adapted to such purpose. We show how an analysis of the
+$k$-resolved spin polarization gives the necessary insight to understand the
+different charge-spin interconversion mechanisms. We have tested it in the
+simplest scenario of isolated graphene in a perpendicular electric field where
+effective tight-binding models are available to compare with. Our results show
+that the flow of an unpolarized current across a single layer of graphene
+produces, as expected, a spin separation perpendicular to the current for two
+of the three spin components (out-of-plane and longitudinal), which is the
+signature of the spin Hall effect. Additionally, it also yields an overall spin
+accumulation for the third spin component (perpendicular to the current), which
+is the signature of the Rashba-Edelstein effect. Even in this simple example,
+our results reveal an unexpected competition between the Rashba and the
+intrinsic spin-orbit coupling. Remarkably, the sign of the accumulated spin
+density does not depend on the electron or hole nature of the injected current
+for realistic values of the Rashba coupling.",2112.07559v1
+2013-12-10,Rashba spin orbit coupling in the Kane-Mele-Hubbard model,"Spin-orbit (SO) coupling is the crucial parameter to drive topological
+insulating phases in electronic band models. In particular, the generic
+emergence of SO coupling involves the Rashba term which fully breaks the SU(2)
+spin symmetry. As soon as interactions are taken into account, however, many
+theoretical studies have to content themselves with the analysis of a
+simplified U(1) conserving SO term without Rashba coupling. We intend to fill
+this gap by studying the Kane-Mele-Hubbard (KMH) model in the presence of
+Rashba SO coupling and present the first systematic analysis of the effect of
+Rashba SO coupling in a correlated two-dimensional topological insulator. We
+apply the variational cluster approach (VCA) to determine the interacting phase
+diagram by computing local density of states, magnetization, single particle
+spectral function, and edge states. Preceded by a detailed VCA analysis of the
+KMH model in the presence of U(1) conserving SO coupling, we find that the
+additional Rashba SO coupling drives new electronic phases such as a metallic
+regime and a direct-gap only topological insulating phase which persist in the
+presence of interactions.",1312.2934v2
+2006-01-14,Spin Hall effect in two-dimensional $p$-type semiconductors in a magnetic field,"We calculate the spin Hall conductivity driven by Rashba spin-orbit
+interaction in $p$-type two-dimensional semiconductors in the presence of a
+perpendicular magnetic field. For a highly confined quantum well, the system is
+described by a $k$-cubic Rashba term for two-dimensional heavy holes.
+  The eigenstates of the system can be described by
+  Landau spinor states. First we consider the conventional spin Hall
+conductivity. The contribution of the interband transitions to the
+Kubo-Greenwood formula gives the density dependent intrinsic spin Hall
+conductivity, which approaches its universal value $\sigma^z_{xy}=9e/8\pi$ for
+weak spin-orbit coupling and low Fermi energies, in agreement with previous
+work.
+  However two intraband contribution terms cancel this effect leading to zero
+conventional spin Hall conductivity. Adding the torque dipole contribution to
+the definition of spin current, we also study the {\it effective} spin
+conductivity. This is shown to be proportional to the total magnetization plus
+surface terms which exactly cancel it for small spin-orbit coupling. If in low
+magnetic field the intraband transitions evolve to vertex corrections, the fact
+that both {effective} and conventional spin Hall conductivities vanish is
+unexpected. This suggests that the zero magnetic field limit of the model is
+singular.",0601315v2
+2019-05-03,Effective spin-mixing conductance of topological-insulator/ferromagnet and heavy-metal/ferromagnet spin-orbit-coupled interfaces: A first-principles Floquet-nonequilibrium-Green-function approach,"The spin mixing conductance (SMC) is a key quantity determining efficiency of
+spin transport across interfaces. Thus, knowledge of its precise value is
+required for accurate measurement of parameters quantifying numerous effects in
+spintronics, such as spin-orbit torque, spin Hall magnetoresistance, spin Hall
+effect and spin pumping. However, the standard expression for SMC, provided by
+the scattering theory in terms of the reflection probability amplitudes, is
+inapplicable when strong spin-orbit coupling (SOC) is present directly at the
+interface. This is the precisely the case of topological-insulator/ferromagnet
+and heavy-metal/ferromagnet interfaces of great contemporary interest. We
+introduce an approach where first-principles Hamiltonian of these interfaces,
+obtained from noncollinear density functional theory (ncDFT) calculations, is
+combined with charge conserving Floquet-nonequilibrium-Green-function formalism
+to compute {\em directly} the pumped spin current $I^{S_z}$ into semi-infinite
+left lead of two-terminal heterostructures Cu/X/Co/Cu or Y/Co/Cu---where
+X=Bi$_2$Se$_3$ and Y=Pt or W---due to microwave-driven steadily precessing
+magnetization of the Co layer. This allows us extract an effective SMC as a
+prefactor in $I^{S_z}$ vs. precession cone angle $\theta$ dependence, as long
+as it remains the same, $I^{S_z} \propto \sin^2 \theta$, as in the case where
+SOC is absent. By comparing calculations where SOC in switched off vs. switched
+on in ncDFT calculations, we find that SOC consistently reduces the pumped spin
+current and, therefore, the effective SMC.",1905.01299v2
+2015-05-05,Large spin Hall magnetoresistance and its correlation to the spin-orbit torque in W/CoFeB/MgO structures,"The spin-orbit interaction in heavy metal/ferromagnet/oxide structures has
+been extensively investigated because it can be employed in manipulation of the
+magnetization direction by in-plane current. This implies the existence of an
+inverse effect, in which the conductivity in such structures should depend on
+the magnetization orientation. In this work, we report a systematic study of
+the magnetoresistance (MR) of the W/CoFeB/MgO structures and its correlation to
+the current-induced torque to the magnetization. We observe that the MR is
+independent of the angle between magnetization and current direction, but is
+determined by the relative magnetization orientation with respect to the spin
+direction accumulated by spin Hall effect, which is the same symmetry of
+so-called spin Hall magnetoresistance. The MR of ~1% in W/CoFeB/MgO samples is
+considerably larger than those in other structures of Ta/CoFeB/MgO or
+Pt/Co/AlOx, which indicates a larger spin Hall angle of W. Moreover, the
+similar W thickness dependence of the MR and the current-induced magnetization
+switching efficiency demonstrates that they share the same underlying physics,
+which allows one to utilize the MR in non-magnet/ferromagnet structure in order
+to understand closely related other spin-orbit coupling effects such as inverse
+spin Hall effect, spin-orbit spin transfer torques, etc.",1505.00899v1
+2015-08-31,Spin Response to Localized Pumps: Exciton Polaritons Versus Electrons and Holes,"Polariton polarization can be described in terms of a pseudospin which can be
+oriented along the $x,\,y,$ or $z$ axis, similarly to electron and hole spin.
+Unlike electrons and holes where time-reversal symmetry requires that the
+spin-orbit interaction be odd in the momentum, the analogue of the spin-orbit
+interaction for polaritons, the so-called TE-TM splitting, is even in the
+momentum. We calculate and compare spin transport of polariton, electron, and
+hole systems, in the diffusive regime of many scatterings. After dimensional
+rescaling diffusive systems with spatially uniform particle densities have
+identical dynamics, regardless of the particle type. Differences between the
+three particles appear in spatially non-uniform systems, with pumps at a
+specific localized point. We consider both oscillating pumps and transient
+(delta-function) pumps. In such systems each particle type produces distinctive
+spin patterns. The particles can be distinguished by their differing spatial
+multipole character, their response and resonances in a perpendicular magnetic
+field, and their relative magnitude which is largest for electrons and weakest
+for holes. These patterns are manifested both in response to unpolarized pumps
+which produce in-plane and perpendicular spin signals, and to polarized pumps
+where the spin precesses from in-plane to out-of-plane and vice versa. These
+results will be useful for designing systems with large spin polarization
+signals, for identifying the dominant spin-orbit interaction and measuring
+subdominant terms in experimental devices, and for measuring the scattering
+time and the spin-orbit coupling's magnitude.",1508.07863v2
+2022-10-28,Field-free-switching state diagram of perpendicular magnetization subjected to conventional and unconventional spin-orbit torques,"The lack of certain crystalline symmetries in strong spin-orbit-coupled
+non-magnetic materials allows for the existence of uncoventional spin Hall
+responses, with electrically generated transverse spin currents possessing
+collinear flow and spin directions. The injection of such spin currents into an
+adjacent ferromagnetic layer can excite magnetization dynamics via
+unconventional spin-orbit torques, leading to deterministic switching in
+ferromagnets with perpendicular magnetic anisotropy. We study the interplay
+between conventional and unconventional spin-orbit torques on the magnetization
+dynamics of a perpendicular ferromagnet in the small intrinsic damping limit,
+and identify a rich set of dynamical regimes that includes deterministic and
+probabilistic switching, precessional and pinning states. Contrary to common
+belief, we found that there exists a critical conventional spin Hall angle,
+beyond which deterministic magnetization switching transitions to a
+precessional or pinned state. Conversely, we showed that larger unconventional
+spin Hall angle is generally beneficial for deterministic switching. We derive
+an approximate expression that qualitatively describes the state diagram
+boundary between the full deterministic switching and precessional states and
+discuss a criterion for searching symmetry-broken spin Hall materials in order
+to maximize switching efficiency. Our work offers a roadmap towards energy
+efficient spintronic devices, which might opens doors for applications in
+advanced in-memory computing technologies.",2210.16344v1
+2020-08-25,Bottom-up design of spin-split and reshaped electronic band structures in spin-orbit-coupling free antiferromagnets: Procedure on the basis of augmented multipoles,"We propose an efficient microscopic design procedure of electronic band
+structures having intrinsic spin and momentum dependences in
+spin-orbit-coupling free antiferromagnets. Our bottom-up design approach to
+creating desired spin-split and reshaped band structures could result in
+further findings of practical spin-orbit-coupling free materials exhibiting a
+giant spin-dependent and/or nonreciprocal transport, magneto-electric and
+elastic responses as a consequence of such band structures. We establish a
+systematic guideline to construct symmetric/antisymmetric spin-split and
+antisymmetrically deformed spin-independent band structures in
+spin-orbit-coupling free systems by using two polar multipole degrees of
+freedom, electric and magnetic toroidal multipoles. The two polar multipoles
+describe arbitrary degrees of freedom in the hopping Hamiltonian, whose onsite
+and offsite degrees of freedom in a cluster are described as the cluster and
+bond multipoles, respectively, and another degree of freedom connecting between
+clusters is expressed as momentum multipoles. By using these multipole
+descriptions, we elucidate simple microscopic conditions to realize intrinsic
+band deformations in magnetically ordered states: The symmetric spin splitting
+is realized in collinear magnets when cluster and bond multipoles contain the
+same symmetry of multipoles. The antisymmetric spin splitting occurs in
+noncollinear antiferromagnets when a bond-type magnetic toroidal multipole is
+present. Furthermore, the antisymmetric band deformation with spin degeneracy
+is realized in noncoplanar antiferromagnets. We exemplify three lattice systems
+in order to demonstrate the band deformations under the magnetic ordering. On
+the basis of the proposed procedure, we list up various candidate materials
+showing intrinsic band deformations in accordance with MAGNDATA, magnetic
+structures database.",2008.10815v2
+2013-10-07,Spin Splitting Induced by a Competition between Quantum Spin Hall Edge States and Valley Edge States,"Strained graphene with lattice deformations has been demonstrated to give
+rise to large pseudomagnetic fields and host many exotic properties. Here, we
+propose a non-magnetic approach to realize a momentum-dependent out-of-plane
+spin splitting in strained graphene nanoribbons with a moderate spin-orbit
+coupling. This unique spin splitting distincts from the well-known Zeeman-type
+spin splitting and the Rashba-type spin splitting. Our analysis indicates that
+the competition between quantum spin Hall edge states and valley edge states in
+the nanoribbon leads to the unique spin splitting. The quantum spin Hall states
+at one edge of the nanoribbon are suppressed by the counterpropagating edge
+modes induced by the pseudomagnetic field. At the opposite edge, the quantum
+spin Hall states are not affected at all. Therefore, the degenerate quantum
+spin Hall states of opposite spin orientation, which propagate at the two
+opposite edges of the nanoribbon, are lifted. This result reveals a new method
+to manipulate the spin degrees of freedom of electrons.",1310.1671v2
+2020-10-28,Fast spin-valley-based quantum gates in Si with micromagnets,"An electron spin qubit in silicon quantum dots holds promise for quantum
+information processing due to the scalability and long coherence. An essential
+ingredient to recent progress is the employment of micromagnets. They generate
+a synthetic spin-orbit coupling (SOC), which allows high-fidelity spin
+manipulation and strong interaction between an electron spin and cavity
+photons. To scaled-up quantum computing, multiple technical challenges remain
+to be overcome, including controlling the valley degree of freedom, which is
+usually considered detrimental to a spin qubit. Here, we show that it is
+possible to significantly enhance the electrical manipulation of a spin qubit
+through the effect of constructive interference and the large spin-valley
+mixing. To characterize the quality of spin control, we also studied spin
+dephasing due to charge noise through spin-valley mixing. The competition
+between the increased control strength and spin dephasing produces two
+sweet-spots, where the quality factor of the spin qubit can be high. Finally,
+we reveal that the synthetic SOC leads to distinctive spin relaxation in
+silicon, which explains recent experiments.",2010.14844v3
+2004-02-10,Magnetism in semiconductors: A dynamical mean field study of ferromagnetism in Ga_{1-x}Mn_xAs,"We employ the dynamical mean field approximation to perform a systematic
+study of magnetism in Ga_{1-x}Mn_xAs. Our model incorporates the effects of the
+strong spin-orbit coupling on the J=3/2 GaAs valence bands and of the exchange
+interaction between the randomly distributed magnetic ions and the itinerant
+holes. The ferromagnetic phase transition temperature T_c is obtained for
+different values of the impurity-hole coupling J_c and of the hole
+concentration n_h at the Mn doping of x=0.05. We also investigate the
+temperature dependence of the local magnetization and spin polarization of the
+holes. By comparing our results with those for a single band Hamiltonian in
+which the spin-orbit coupling is switched off, we conclude that the spin-orbit
+coupling in Ga_{1-x}Mn_xAs gives rise to frustration in the ferromagnetic
+order, strengthening recent findings by Zarand and Janko (Phys. Rev. Lett. 89,
+047201 (2002)).",0402289v1
+2005-07-14,Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O II: Multiple phase diagram under the magnetic field,"The possibility of multiple phase diagram in the novel superconductor
+Na_{x}CoO_{2}yH_{2}O is analyzed on the basis of the multi-orbital Hubbard
+model including the atomic spin-orbit coupling. We have shown that the spin
+triplet pairing state is stable in this model. The p-wave (f-wave) state is
+stabilized when the Hund's rule coupling is large (small). In the precedent
+paper, we have determined the direction of d-vector at T=Tc and H=0 within the
+linearized Dyson-Gorkov equation. In this paper, the pairing state below Tc and
+under the magnetic field is determined within the weak coupling approximation
+including the paramagnetic effect. We find that the p+f coexistent state is
+stabilized at low temperatures in a part of parameter range. We point out that
+the phase diagram in the H-T plane is quite different between the p-wave,
+f-wave and p+f-wave superconductivities. The characteristics of each phase are
+clarified by showing the magnetic susceptibility and specific heat. We discuss
+the comparison with experimental results and suggest some future experiments to
+detect the multiple phase transition.",0507327v1
+2006-03-08,Tunneling conductance of a mesoscopic ring with spin-orbit coupling and Tomonaga-Luttinger interaction,"We study the tunneling current through a mesoscopic two-terminal ring with
+spin-orbit coupling, which is threaded by a magnetic flux. The
+electron-electron interaction in the ring is described in terms of a
+Tomonaga-Luttinger model which also allows us to account for a capacitive
+coupling between the ring and the gate electrode. In the regime of weak
+tunneling, we describe how, at temperatures lower than the mean level spacing,
+the peak positions of the conductance depend on magnetic flux, spin-orbit
+coupling strength, gate voltage, charging energy, and interaction parameters
+(charge and spin velocity and stiffness).",0603211v2
+2014-04-26,Kondo effect in graphene with Rashba spin-orbit coupling,"We study the Kondo screening of a magnetic impurity adsorbed in graphene in
+the presence of Rashba spin-orbit interaction. The system is described by an
+effective single-channel Anderson impurity model, which we analyze using the
+numerical renormalization group. The nontrivial energy dependence of the host
+density of states gives rise to interesting behaviors under variation of the
+chemical potential or the spin-orbit coupling. Varying the Rashba coupling
+produces strong changes in the Kondo temperature characterizing the many-body
+screening of the impurity spin, and at half filling allows approach to a
+quantum phase transition separating the strong-coupling Kondo phase from a
+free-moment phase. Tuning the chemical potential close to sharp features of the
+hybridization function results in striking features in the temperature
+dependences of thermodynamic quantities and in the frequency dependence of the
+impurity spectral function.",1404.6669v2
+2015-01-29,Electron Correlation Effects in Non-Centrosymmetric Metals in the Weak Coupling Regime,"The two-dimensional Rashba-Hubbard model is investigated in order to clarify
+the electron correlation effects in non-centrosymmetric metals. The
+renormalization effect on Rashba spin-orbit coupling (RSOC) is calculated on
+the basis of second-order and third-order perturbation theories. We show that
+RSOC is enhanced by the electron correlation. On the other hand, the
+spin-splitting of the Fermi momentum (SFM) is robust against the electron
+correlation effect because the enhancement of RSOC is cancelled by the $k$-mass
+renormalization. The cancellation is almost perfect in often adopted models in
+which the momentum dependence of RSOC is linear in the quasiparticle velocity.
+A small correction to the SFM appears otherwise. We show that the same results
+are obtained for other antisymmetric spin-orbit couplings in
+non-centrosymmetric systems, such as the synthetic spin-orbit coupling in cold
+atoms.",1501.07367v3
+2016-01-18,Spin-orbit coupling and odd-parity superconductivity in the quasi-one-dimensional compound Li$_{0.9}$Mo$_6$O$_{17}$,"Previous theoretical studies [W. Cho, C. Platt, R. H. McKenzie, and S. Raghu,
+Phys. Rev. B 92, 134514 (2015); N. Lera and J. V. Alvarez, Phys. Rev. B 92,
+174523 (2015)] have suggested that Li$_{0.9}$Mo$_6$O$_{17}$, a quasi-one
+dimensional ""purple bronze"" compound, exhibits spin-triplet superconductivity
+and that the gap function changes sign across the two nearly degenerate Fermi
+surface sheets. We investigate the role of spin-orbit coupling (SOC) in
+determining the symmetry and orientation of the $d$-vector associated with the
+superconducting order parameter. We propose that the lack of local inversion
+symmetry within the four-atom unit cell leads to a staggered spin-orbit
+coupling analogous to that proposed for graphene, MoS$_2$, or SrPtAs. In
+addition, from a weak-coupling renormalization group treatment of an effective
+model Hamiltonian, we find that SOC favors the odd parity $A_{1u}$ state with
+$S_z = \pm 1$ over the $B$ states with $S_z=0$, where $z$ denotes the
+least-conducting direction. We discuss possible definitive experimental
+signatures of this superconducting state.",1601.04757v1
+2017-08-30,Quantum Phases of Two-Component Bosons with Spin-Orbit Coupling in Optical Lattices,"Ultracold bosons in optical lattices are one of the few systems where bosonic
+matter is known to exhibit strong correlations. Here we push the frontier of
+our understanding of interacting bosons in optical lattices by adding synthetic
+spin-orbit coupling, and show that new kinds of density- and chiral-orders
+develop. The competition between the optical lattice period and the spin-orbit
+coupling length -- which can be made comparable in experiments -- along with
+the spin hybridization induced by a transverse field (i.e., Rabi coupling) and
+interparticle interactions create a rich variety of quantum phases including
+uniform, non-uniform and phase-separated superfluids, as well as Mott
+insulators. The spontaneous symmetry breaking phenomena at the transitions
+between them are explained by a two-order-parameter Ginzburg-Landau model with
+multiparticle umklapp processes. Finally, in order to characterize each phase,
+we calculated their experimentally measurable crystal momentum distributions.",1708.09186v1
+2014-06-02,Anisotropic Multipolar Exchange Interactions in Systems with Strong Spin-Orbit Coupling,"We introduce a theoretical framework for computaions of anisotropic
+multipolar exchange interactions found in many spin--orbit coupled magnetic
+systems and propose a method to extract these coupling constants using a
+density functional total energy calculation. This method is developed using a
+multipolar expansion of local density matrices for correlated orbitals that are
+responsible for magnetic degrees of freedom. Within the mean--field
+approximation, we show that each coupling constant can be recovered from a
+series of total energy calculations via what we call the ``pair--flip''
+technique. This technique flips the relative phase of a pair of multipoles and
+computes corresponding total energy cost associated with the given exchange
+constant. To test it, we apply our method to Uranium Dioxide, which is a system
+known to have pseudospin $J=1$ superexchange induced dipolar, and superexchange
+plus spin--lattice induced quadrupolar orderings. Our calculation reveals that
+the superexchange and spin--lattice contributions to the quadrupolar exchange
+interactions are about the same order with ferro-- and antiferro--magnetic
+contributions, respectively. This highlights a competition rather than a
+cooperation between them. Our method could be a promising tool to explore
+magnetic properties of rare--earth compounds and hidden--order materials.",1406.0221v1
+2020-04-20,The three body first post-Newtonian effects on the secular dynamics of a compact binary near a spinning supermassive black hole,"The binary black holes (BBHs) formed near the supermassive black holes
+(SMBHs) in the galactic nuclei would undergo eccentricity excitation due to the
+gravitational perturbations from the SMBH and therefore merger more
+efficiently. In this paper, we study the coupling of the three body 1st
+post-Newtonian (PN) effects with the spin effects from the SMBH in the
+hierarchical triple system. We extend previous work by including the coupling
+between the de Sitter precession and the Lense-Thirring precession from the
+SMBH spin. This coupling includes both the precessions of the inner orbit
+angular momentum and the Runge-Lenz vector around the outer orbit angular
+momentum in a general reference frame. We find the change of the (maximal)
+eccentricity in the neighboring Kozai-Lidov cycles due to spin effects is
+detectable by LISA in the future. Our general argument on the coupling of the
+three body 1PN effects in three body systems could be extended to any other
+situation as long as the outer orbital plane evolves.",2004.09390v2
+2020-12-24,Van der Waals Heterostructure Pt$_{2}$HgSe$_{3}$/CrI$_3$ for Topological Valleytronics,"We identify a valley-polarized Chern insulator in the van der Waals
+heterostructure, Pt$_{2}$HgSe$_{3}$/CrI$_3$, for potential applications with
+interplay between electric, magnetic, optical, and mechanical effects. The
+interlayer proximity magnetic coupling nearly closes the band gap of
+Pt$_{2}$HgSe$_{3}$ and the strong intra-layer spin-orbit coupling further lifts
+the valley degeneracy by over 100 meV leading to positive and negative band
+gaps at opposite valleys. In the valley with negative gap, the interfacial
+Rashba spin-orbit coupling opens a topological band gap of 17.8 meV, which is
+enlarged to 30.8 meV by adding an $h$-BN layer. We find large orbital
+magnetization in Pt$_{2}$HgSe$_{3}$ layer that is much larger than spin, which
+can induce measurable optical Kerr effect. The valley polarization and Chern
+number are coupled to the magnetic order of the nearest neighboring CrI$_3$
+layer, which is switchable by electric, magnetic, and mechanical means in
+experiments. The presence of $h$-BN protects the topological phase allowing the
+construction of superlattices with valley, spin, and layer degrees of freedoms.",2012.13298v1
+2017-11-28,Interplay of spin-orbit coupling and hybridization in Ca3LiOsO6 and Ca3LiRuO6,"The electronic ground state of Ca3LiOsO6 was recently considered within an
+intermediate coupling regime that revealed J=3/2 spin-orbit entangled magnetic
+moments. Through inelastic neutron scattering and density functional theory we
+investigate the magnetic interactions and probe how the magnetism is influenced
+by the change in hierarchy of interactions as we move from Ca3LiOsO6 (5d3) to
+Ca3LiRuO6 (4d3). An alteration of the spin-gap and ordered local moment is
+observed, however the magnetic structure, Neel temperature and exchange
+interactions are unaltered. To explain this behavior it is necessary to include
+both spin-orbit coupling and hybridization, indicating the importance of an
+intermediate coupling approach when describing 5$d$ oxides.",1711.10393v1
+2019-04-07,Tuning Rashba spin-orbit coupling at LaAlO3/SrTiO3 interfaces by band filling,"The electric-field tunable Rashba spin-orbit coupling at the LaAlO3/SrTiO3
+interface shows potential applications in spintronic devices. However,
+different gate dependence of the coupling strength has been reported in
+experiments. On the theoretical side, it has been predicted that the largest
+Rashba effect appears at the crossing point of the $d_{xy}$ and $d_{xz,yz}$
+bands. In this work, we study the tuneability of the Rashba effect in
+LaAlO3/SrTiO3 by means of back-gating. The Lifshitz transition was crossed
+multiple times by tuning the gate voltage so that the Fermi energy is tuned to
+approach or depart from the band crossing. By analyzing the weak
+antilocalization behavior in the magnetoresistance, we find that the maximum
+spin-orbit coupling effect occurs when the Fermi energy is near the Lifshitz
+point. Moreover, we find strong evidence for a single spin winding at the Fermi
+surface.",1904.03731v1
+2021-10-19,"Ab initio Calculations in Atoms, Molecules, and Solids, Treating Spin-Orbit Coupling and Electron Interaction on Equal Footing","We incorporate explicit, non-perturbative treatment of spin-orbit coupling
+into ab initio auxiliary-field quantum Monte Carlo (AFQMC) calculations. The
+approach allows a general computational framework for molecular and bulk
+systems in which materials specificity, electron correlation, and spin-orbit
+coupling effects can be captured accurately and on equal footing, with
+favorable computational scaling versus system size. We adopt relativistic
+effective-core potentials which have been obtained by fitting to fully
+relativistic data and which have demonstrated a high degree of reliability and
+transferability in molecular systems. This results in a 2-component
+spin-coupled Hamiltonian, which is then treated by generalizing the ab initio
+AFQMC approach. We demonstrate the method by computing the electron affinity in
+Pb, the bond dissociation energy in Br$_2$ and I$_2$, and solid Bi.",2110.10201v1
+1999-02-09,Spin liquid ground state in a two dimensional non-frustrated spin model,"We consider an exchange model describing two isotropic spin-1/2 Heisenberg
+antiferromagnets coupled by a quartic term on the square lattice. The model is
+relevant for systems with orbital degeneracy and strong electron-vibron
+coupling in the large Hubbard repulsion limit, and is known to show a
+spin-Peierls-like dimerization in one dimension. In two dimensions we calculate
+energy gaps, susceptibilities, and correlation functions with a Green's
+Function Monte Carlo. We find a finite spin gap and no evidence of any kind of
+order. We conclude that the ground state is, most likely, a spin liquid of
+resonating valence bonds.",9902116v1
+2006-01-16,Transport Equations and Spin-Charge Propagating Mode in the Two Dimensional Hole Gas,"We find that the spin-charge motion in a strongly confined two-dimensional
+hole gas (2DHG) supports a propagating mode of cubic dispersion apart from the
+diffusive mode due to momentum scattering. Propagating modes seem to be a
+generic property of systems with spin-orbit coupling. Through a rigorous
+Keldysh approach, we obtain the transport equations for the 2DHG, we analyze
+the behavior of the hole spin relaxation time, the diffusion coefficients, and
+the spin-charge coupled motion.",0601353v1
+2006-05-23,Spin currents in the Rashba model in the presence of non-uniform fields,"Spin currents in a two dimensional electron gas with Rashba-type spin orbit
+coupling are derived from a spin connection. Using a functional integral
+method, we recover the result derived by Sinova {\em et al.}$[
+\mathrm{Phys.Rev. Lett.
+  92, 126603 (2004)}]$ for a uniform electric field and in the absence of
+impurities. We extend this result to inhomogeneous electric and magnetic
+fields. We find that non-uniform magnetic fields can give rise to spin currents
+that are independent of the Rashba coupling and hence are less susceptible to
+impurities than in the case of uniform electric fields.",0605582v1
+2006-04-26,Spin-Excitation Mechanisms in Skyrme-Force Time-Dependent Hartree-Fock,"We investigate the role of odd-odd (with respect to time inversion) couplings
+in the Skyrme force on collisions of light nuclei, employing a fully
+three-dimensional numerical treatment without any symmetry restrictions and
+with modern Skyrme functionals. We demonstrate the necessity of these couplings
+to suppress spurious spin excitations owing to the spin-orbit force in free
+translational motion of a nucleus but show that in a collision situation there
+is a strong spin excitation even in spin-saturated systems which persists in
+the departing fragments. The energy loss is considerably increased by the
+odd-odd terms.",0604070v1
+2024-01-16,Classical 'spin' filtering with two degrees of freedom and dissipation,"Coupling of angular motion to a spin degree of freedom gives rise to various
+transport phenomena in quantum systems that are beyond the standard paradigms
+of classical physics. Here, we discuss features of spin-orbit dynamics that can
+be visualized using a classical model with two coupled angular degrees of
+freedom. Specifically, we demonstrate classical 'spin' filtering through our
+model and show that the interplay between angular degrees of freedom and
+dissipation can lead to asymmetric 'spin' transport.",2401.08454v1
+2021-02-24,Spin texture in a bilayer high-temperature cuprate superconductor,"We investigate the possibility of spin texture in the bilayer cuprate
+superconductor $\rm Bi_2Sr_2CaCu_2O_{8+\delta}$ using cluster dynamical mean
+field theory (CDMFT). The one-band Hubbard model with a small interlayer
+hopping and a Rashba spin-orbit coupling is used to describe the material. The
+$d$-wave order parameter is not much affected by the presence of the Rashba
+coupling, but a small triplet component appears. We find a spin texture
+circulating in the same direction around $\mathbf{k}=(0,0)$ and
+$\mathbf{k}=(\pi,\pi)$ and stable against the superconducting phase. The
+amplitude of the spin structure, however, is strongly affected by the pseudogap
+phenomenon, more so than the spectral function itself.",2102.12015v1
+2011-01-04,"Density functional theory analysis of the interplay between Jahn-Teller instability, uniaxial magnetism, spin arrangement, metal-metal interaction and spin-orbit coupling in Ca3CoMO6 (M = Co, Rh, Ir)","In the isostructural oxides Ca3CoMO6 (M = Co, Rh, Ir), the CoMO6 chains made
+up of face-sharing CoO6 trigonal prisms and MO6 octahedra are separated by Ca
+atoms. We analyzed the magnetic and electronic properties of these oxides on
+the basis of density functional theory calculations including on-site repulsion
+and spin-orbit coupling, and examined the essential one-electron pictures
+hidden behind results of these calculations. Our analysis reveals an intimate
+interplay between Jahn-Teller instability, uniaxial magnetism, spin
+arrangement, metal-metal interaction, and spin-orbit coupling in governing the
+magnetic and electronic properties of these oxides. These oxides undergo a
+Jahn-Teller distortion but their distortions are weak, so that their
+trigonal-prism Con+ (n = 2, 3) ions still give rise to strong easy-axis
+anisotropy along the chain direction. As for the d-state split pattern of these
+ions, the electronic and magnetic properties of Ca3CoMO6 (M = Co, Rh, Ir) are
+consistent with d0 < (d2, d-2) < (d1, d-1), but not with (d2, d-2) < d0 < (d1,
+d-1). The trigonal-prism Co3+ ion in Ca3Co2O6 has the L = 2 configuration
+(d0)1(d2, d-2)3(d1, d-1)2 because of the metal-metal interaction between
+adjacent Co3+ ions in each Co2O6 chain, which is mediated by their z2 orbitals,
+and the spin-orbit coupling of the trigonal-prism Co3+ ion. The spins in each
+CoMO6 chain of Ca3CoMO6 prefer the ferromagnetic arrangement for M = Co and Rh,
+but the antiferromagnetic arrangement for M = Ir. The octahedral M4+ ion of
+Ca3CoMO6 has the (1a)1(1e)4 configuration for M = Rh but the (1a)2(1e)3
+configuration for M = Ir, which arises from the difference in the spin-orbit
+coupling of the M4+ ions and the Co...M metal-metal interactions.",1101.0644v1
+2015-03-06,Ultrafast spin dynamics in II-VI diluted magnetic semiconductors with spin-orbit interaction,"We study theoretically the ultrafast spin dynamics of II-VI diluted magnetic
+semiconductors in the presence of spin-orbit interaction. Our goal is to
+explore the interplay or competition between the exchange $sd$-coupling and the
+spin-orbit interaction in both bulk and quantum well systems. For bulk
+materials we concentrate on Zn$_{1-x}$Mn$_x$Se and take into account the
+Dresselhaus interaction, while for quantum wells we examine
+Hg$_{1-x-y}$Mn$_x$Cd$_y$Te systems with a strong Rashba coupling. Our
+calculations were performed with a recently developed formalism which
+incorporates electronic correlations beyond mean-field theory originated from
+the exchange $sd$-coupling. For both bulk and quasi-two-dimensional systems we
+find that, by varying the system parameters within realistic ranges, both
+interactions can be chosen to play a dominant role or to compete on an equal
+footing with each other. The most notable effect of the spin-orbit interaction
+in both types of systems is the appearance of strong oscillations where the
+exchange $sd$-coupling by itself only causes an exponential decay of the mean
+electronic spin components. The mean-field approximation is also studied and it
+is interpreted analytically why it shows a strong suppression of the
+spin-orbit-induced dephasing of the spin component parallel to the Mn magnetic
+field.",1503.01937v2
+2016-01-07,Hubbard model with Rashba or Dresselhaus spin-orbit coupling and Rotated Anti-ferromagnetic Heisenberg Model,"In this work, we investigate the possible dramatic effects of Rashba or
+Dresselhaus spin-orbit coupling (SOC) on fermionic Hubbard model in a 2d square
+lattice. In the strong coupling limit, it leads to the Rotated
+Anti-ferromagnetic Heisenberg model which is a new class of quantum spin model.
+For a special equivalent class, we identify a new spin-orbital entangled
+commensurate ground ( Y-y ) state subject to strong quantum fluctuations at
+$T=0$. We evaluate the quantum fluctuations by the spin wave expansion up to
+order $ 1/S^2 $. In some SOC parameter regime, the Y-y state supports a massive
+relativistic in-commensurate magnon ( C-IC ) with its two gap minima positions
+continuously tuned by the SOC parameters. The C-IC magnons dominate all the low
+temperature thermodynamic quantities and also lead to the separation of the
+peak positions between the longitudinal and the transverse spin structure
+factors. In the weak coupling limit, any weak repulsive interaction also leads
+to a weak Y-y state. There is only a crossover from the weak to the strong
+coupling. High temperature expansions of the specific heats in both weak and
+strong coupling are presented. The dramatic roles to be played by these C-IC
+magnons at generic SOC parameters or under various external probes are hinted.
+Experimental applications to both layered noncentrosymmetric materials and cold
+atom are discussed.",1601.01642v2
+2001-11-14,"Magnetic Ordering, Orbital Ordering and Resonant X-ray Scattering in Perovskite Titanates","The effective Hamiltonian for perovskite titanates is derived by taking into
+account the three-fold degeneracy of $t_{2g}$ orbitals and the strong
+electron-electron interactions. The magnetic and orbital ordered phases are
+studied in the mean-field approximation applied to the effective Hamiltonian. A
+large degeneracy of the orbital states in the ferromagnetic phase is found in
+contrast to the case of the doubly degenerate $e_g$ orbitals. Lifting of this
+orbital degeneracy due to lattice distortions and spin-orbit coupling is
+examined. A general form for the scattering cross section of the resonant x-ray
+scattering is derived and is applied to the recent experimental results in
+YTiO$_3$. The spin wave dispersion relation in the orbital ordered YTiO$_3$ is
+also studied.",0111249v1
+2020-12-16,Adiabatically Induced Orbital Magnetization,"A semiclassical theory for the orbital magnetization due to adiabatic
+evolutions of Bloch electronic states is proposed. It renders a unified theory
+for the periodic-evolution pumped orbital magnetization and the orbital
+magnetoelectric response in insulators by revealing that these two phenomena
+are the only instances where the induced magnetization is gauge invariant. This
+theory also accounts for the electric-field induced intrinsic orbital
+magnetization in two-dimensional metals and Chern insulators. We illustrate the
+orbital magnetization pumped by microscopic local rotations of atoms, which
+correspond to phonon modes with angular momentum, in toy models based on
+honeycomb lattice, and the results are comparable to the pumped spin
+magnetization via strong Rashba spin orbit coupling. We also show the vital
+role of the orbital magnetoelectricity in validating the Mott relation between
+the intrinsic nonlinear anomalous Hall and Ettingshausen effects.",2012.08750v3
+2020-11-15,Orbital gyrotropic magneto-electric effect and its strain engineering in monolayer Nb$X_2$,"Electrical control of the orbital degrees of freedom is an important area of
+research in the emerging field of ""orbitronics."" Orbital {\it gyrotropic}
+magneto-electric effect (OGME) is the generation of an orbital magnetization in
+a nonmagnetic metal by an applied electric field. Here, we show that strain
+induces a large GME in the monolayer Nb$X_2$ ($X =$ S, Se) normal to the plane,
+primarily driven by the orbital moments of the Bloch bands as opposed to the
+conventional spin magnetization, without any need for spin-orbit coupling. The
+key physics is captured within an effective two-band valley-orbital model and
+it is shown to be driven by three key ingredients: the intrinsic valley orbital
+moment, broken $C_{3z}$ symmetry, and strain-induced Fermi surface changes. The
+effect can be furthermore switched by changing the strain condition, with
+potential for future device applications.",2011.07508v1
+2024-03-18,Spin-Orbital Ordering in Alkali Superoxides,"Akali superoxides AO2 (A=Na, K, Rb, Cs), due to an open p shell of the oxygen
+ion O2^- with degenerate pi orbitals, have spin and orbital degrees of freedom.
+The complex magnetic, orbital, and structural phase transitions observed
+experimentally in this family of materials are only partially understood. Based
+on density functional theory, we derive a strong-coupling effective model for
+the isostructural compounds AO2 (A=K, Rb, Cs) from a two-orbital Hubbard model.
+We find that CsO2 has highly frustrated exchange interactions in the a-b plane,
+while the frustration is weaker for smaller alkali ions. We solve the resulting
+Kugel-Khomskii model in the mean-field approximation. We show that CsO2
+exhibits an antiferro-orbital (AFO) order with the ordering vector q=(1,0,0)
+and a stripe antiferromagnetic order with q=(1/2,0,0), which is consistent with
+recent neutron scattering experiments. We discuss the role of the pi-orbital
+degrees of freedom for the experimentally observed magnetic transitions and
+interpret the as-yet-unidentified T_s2=70K transition in CsO2 as an orbital
+ordering transition.",2403.11698v2
+2019-04-17,Two-orbital effective model for magnetic Weyl semimetal in Kagome-lattice shandite,"We construct a two-orbital effective model for a ferromagnetic Kagome-lattice
+shandite, $\rm{{Co}_3{Sn}_2{S}_2}$, a candidate material of magnetic Weyl
+semimetals, by considering one $d$ orbital from Co, and one $p$ orbital from
+interlayer Sn. The energy spectrum near the Fermi level, and the configurations
+of the Weyl points, computed by using our model, are similar to those obtained
+by first principle calculations. We show also that nodal rings appear even with
+spin-orbit coupling when the magnetization points in-plane direction.
+Additionally, magnetic properties of $\rm{{Co}_3{Sn}_2{S}_2}$ and other
+shandite materials are discussed.",1904.08148v1
+2004-07-25,The dynamics of precessing binary black holes using the post-Newtonian approximation,"We investigate the (conservative) dynamics of binary black holes using the
+Hamiltonian formulation of the post-Newtonian (PN) equations of motion. The
+Hamiltonian we use includes spin-orbit coupling, spin-spin coupling, and mass
+monopole/spin-induced quadrupole interaction terms. In the case of both
+quasi-circular and eccentric orbits, we search for the presence of chaos (using
+the method of Lyapunov exponents) for a large variety of initial conditions.
+For quasi-circular orbits, we find no chaotic behavior for black holes with
+total mass 10 - 40 solar masses when initially at a separation corresponding to
+a Newtonian gravitational-wave frequency less than 150 Hz. Only for rather
+small initial radial distances, for which spin-spin induced oscillations in the
+radial separation are rather important, do we find chaotic solutions, and even
+then they are rare. Moreover, these chaotic quasi-circular orbits are of
+questionable astrophysical significance, since they originate from direct
+parametrization of the equations of motion rather than from widely separated
+binaries evolving to small separations under gravitational radiation reaction.
+In the case of highly eccentric orbits, which for ground-based interferometers
+are not astrophysically favored, we again find chaotic solutions, but only at
+pericenters so small that higher order PN corrections, especially higher spin
+PN corrections, should also be taken into account.",0407091v2
+2012-08-21,Graphene for spintronics: giant Rashba splitting due to hybridization with Au,"Graphene in spintronics has so far primarily meant spin current leads of high
+performance because the intrinsic spin-orbit coupling of its pi-electrons is
+very weak. If a large spin-orbit coupling could be created by a proximity
+effect, the material could also form active elements of a spintronic device
+such as the Das-Datta spin field-effect transistor, however, metal interfaces
+often compromise the band dispersion of massless Dirac fermions. Our
+measurements show that Au intercalation at the graphene-Ni interface creates a
+giant spin-orbit splitting (~100 meV) in the graphene Dirac cone up to the
+Fermi energy. Photoelectron spectroscopy reveals hybridization with Au-5d
+states as the source for the giant spin-orbit splitting. An ab initio model of
+the system shows a Rashba-split dispersion with the analytically predicted
+gapless band topology around the Dirac point of graphene and indicates that a
+sharp graphene-Au interface at equilibrium distance will account for only ~10
+meV spin-orbit splitting. The ab initio calculations suggest an enhancement due
+to Au atoms that get closer to the graphene and do not violate the sublattice
+symmetry.",1208.4265v1
+2014-11-24,Manipulating Femtosecond Spin--Orbit Torques with Laser Pulse Sequences to Control Magnetic Memory States and Ringing,"Femtosecond (fs) coherent control of collective order parameters is important
+for non--equilibrium phase dynamics in correlated materials. Here we propose a
+possible scheme for fs control of a ferromagnetic order parameter based on
+non--adiabatic optical manipulation of electron--hole ($e$--$h$)
+photoexcitations between spin--orbit--coupled bands that are exchange--split by
+magnetic interaction with local spins. We photoexcite fs carrier spin--pulses
+with controllable direction and time profile without using
+circularly--polarized light, via time--reversal symmetry--breaking by
+non--perturbative interplay between spin--orbit and magnetic exchange coupling
+of coherent photocarriers. We manipulate photoexcited {\em fs spin--orbit
+torques} to control complex switching pathways of the magnetization between
+multiple magnetic memory states. We calculate the photoinduced fs magnetic
+anisotropy in the time domain by using density matrix equations of motion
+rather than the quasi--equilibrium free energy. By comparing to pump--probe
+experiments, we identify a ""sudden"" magnetization canting induced by laser
+excitation, which displays magnetic hysteresis absent in static
+magneto--optical measurements and agrees with switchings measured by Hall
+magnetoresistivity. The fs magnetization canting switches direction with
+magnetic state and laser frequency, which distinguishes it from nonlinear
+optical and demagnetization longitudinal effects. By shaping two--color
+laser--pulse sequences analogous to multi--dimensional Nuclear Magnetic
+Resonance (NMR) spectroscopy, we show that sequences of clockwise or
+counter--clockwise fs spin--orbit torques can enhance or suppress magnetic
+ringing and switching rotation at any desired time. We propose protocols that
+can provide controlled access to four magnetic states via consequative 90$^{o}$
+switchings.",1411.6662v1
+2017-03-05,Response to Comment on 'Spin-Orbit Logic with Magnetoelectric Nodes: A Scalable Charge Mediated Nonvolatile Spintronic Logic' (arXiv:1607.06690),"In this technical note, we address the comments on the energy estimates for
+Magnetoelectric Spin-orbit (MESO) Logic, a new logic device proposed by the
+authors. We provide an analytical derivation of the switching energy, and
+support it with time-domain circuit simulations using a self-consistent
+ferroelectric (FE) compact model. While the energy to charge a capacitor is
+dissipated in the interconnect and transistor resistance, we note that the
+energy to switch a capacitor and a FE is independent of the interconnect
+resistance value to the first order. Also device design can mitigate the
+parasitic energy losses. We further show the circuit simulations for a sub 10
+aJ switching operation of a MESO logic device comprehending: a) Energy stored
+in multiferroic; b) Energy dissipation in the resistance of the interconnect,
+Ric ; c) Energy dissipation in the inverse spin-orbit coupling (ISOC) spin to
+charge converter Risoc; d) Supply, ground resistance, and transistor losses. We
+also identify the requirements for the resistivity of the spin-orbit coupling
+materials and address the effect of internal resistance of the spin to charge
+conversion layer. We provide the material parameter space where MESO (with a
+fan-out of 1 and interconnect) achieves sub 10 aJ switching energy with path
+for scaling via ferroelectric/magnetoelectric/spin-orbit materials development.",1703.01559v1
+2017-09-15,Emergent $\mathrm{SU}(4)$ Symmetry in $α$-ZrCl$_3$ and Crystalline Spin-Orbital Liquids,"While the enhancement of the spin-space symmetry from the usual
+$\mathrm{SU}(2)$ to $\mathrm{SU}(N)$ is promising for finding nontrivial
+quantum spin liquids, its realization in magnetic materials remains
+challenging. Here we propose a new mechanism by which the $\mathrm{SU}(4)$
+symmetry emerges in the strong spin-orbit coupling limit. In $d^1$ transition
+metal compounds with edge-sharing anion octahedra, the spin-orbit coupling
+gives rise to strongly bond-dependent and apparently $\mathrm{SU}(4)$-breaking
+hopping between the $J_\textrm{eff}=3/2$ quartets. However, in the honeycomb
+structure, a gauge transformation maps the system to an
+$\mathrm{SU}(4)$-symmetric Hubbard model. In the strong repulsion limit at
+quarter filling, as realized in $\alpha$-ZrCl$_3,$ the low-energy effective
+model is the $\mathrm{SU}(4)$ Heisenberg model on the honeycomb lattice, which
+cannot have a trivial gapped ground state and is expected to host a gapless
+spin-orbital liquid. By generalizing this model to other three-dimensional
+lattices, we also propose crystalline spin-orbital liquids protected by this
+emergent $\mathrm{SU}(4)$ symmetry and space group symmetries.",1709.05252v3
+2021-02-25,Unidirectional magnetoresistance and spin-orbit torque in NiMnSb,"Spin-dependent transport phenomena due to relativistic spin-orbit coupling
+and broken space-inversion symmetry are often difficult to interpret
+microscopically, in particular when occurring at surfaces or interfaces. Here
+we present a theoretical and experimental study of spin-orbit torque and
+unidirectional magnetoresistance in a model room-temperature ferromagnet NiMnSb
+with inversion asymmetry in the bulk of this half-heusler crystal. Besides the
+angular dependence on magnetization, the competition of Rashba and
+Dresselhaus-like spin-orbit couplings results in the dependence of these
+effects on the crystal direction of the applied electric field. The
+phenomenology that we observe highlights potential inapplicability of commonly
+considered approaches for interpreting experiments. We point out that, in
+general, there is no direct link between the current-induced non-equilibrium
+spin polarization inferred from the measured spin-orbit torque and the
+unidirectional magnetiresistance. We also emphasize that the unidirectional
+magnetoresistance has not only longitudinal but also transverse components in
+the electric field -- current indices which complicates its separation from the
+thermoelectric contributions to the detected signals in common experimental
+techniques. We use the theoretical results to analyze our measurements of the
+on-resonance and off-resonance mixing signals in microbar devices fabricated
+from an epitaxial NiMnSb film along different crystal directions. Based on the
+analysis we extract an experimental estimate of the unidirectional
+magnetoresistance in NiMnSb.",2102.12838v1
+2013-04-18,A Primordial Origin for Misalignments Between Stellar Spin Axes and Planetary Orbits,"The presence of gaseous giant planets whose orbits lie in extreme proximity
+to their host stars (""hot Jupiters""), can largely be accounted for by planetary
+migration, associated with viscous evolution of proto-planetary nebulae.
+Recently, observations of the Rossiter-McLaughlin effect during planetary
+transits have revealed that a considerable fraction of detected hot Jupiters
+reside on orbits that are misaligned with respect to the spin-axes of their
+host stars. This observational fact has cast significant doubts on the
+importance of disk-driven migration as a mechanism for production of hot
+Jupiters, thereby reestablishing the origins of close-in planetary orbits as an
+open question. Here we show that misaligned orbits can be a natural consequence
+of disk migration. Our argument rests on an enhanced abundance of binary
+stellar companions in star formation environments, whose orbital plane is
+uncorrelated with the spin axes of the individual stars. We analyze the
+dynamical evolution of idealized proto-planetary disks under perturbations from
+massive distant bodies and demonstrate that the resulting gravitational torques
+act to misalign the orbital planes of the disks relative to the spin poles of
+their host stars. As a result, we predict that in the absence of strong
+disk-host star angular momentum coupling or sufficient dissipation that acts to
+realign the stellar spin axis and the planetary orbits, the fraction of
+planetary systems (including systems of hot Neptunes and Super-Earths), whose
+angular momentum vectors are misaligned with respect to their host-stars should
+be commensurate with the rate of primordial stellar multiplicity.",1304.5166v1
+2016-10-19,Interplay of non-symmorphic symmetry and spin-orbit coupling in hyperkagome spin liquids: Applications to Na$_4$Ir$_3$O$_8$,"Na$_4$Ir$_3$O$_8$ provides a material platform to study three-dimensional
+quantum spin liquids in the geometrically frustrated hyperkagome lattice of
+Ir$^{4+}$ ions. In this work, we consider quantum spin liquids on hyperkagome
+lattice for generic spin models, focusing on the effects of anisotropic spin
+interactions. In particular, we classify possible $\mathbb{Z}_2$ and $U(1)$
+spin liquid states, following the projective symmetry group analysis in the
+slave-fermion representation. There are only three distinct $\mathbb{Z}_2$ spin
+liquids, together with 2 different $U(1)$ spin liquids. The non-symmorphic
+space group symmetry of hyperkagome lattice plays a vital role in simplifying
+the classification, forbidding ""$\pi$-flux"" or ""staggered-flux"" phases in
+contrast to symmorphic space groups. We further prove that both $U(1)$ states
+and one $Z_2$ state among all 3 are symmetry-protected gapless spin liquids,
+robust against any symmetry-preserving perturbations. Motivated by the
+""spin-freezing"" behavior recently observed in Na$_4$Ir$_3$O$_8$ at low
+temperatures, we further investigate the nearest-neighbor spin model with
+dominant Heisenberg interaction subject to all possible anisotropic
+perturbations from spin-orbit couplings. We found a $U(1)$ spin liquid ground
+state with spinon fermi surfaces is energetically favored over $Z_2$ states.
+Among all spin-orbit coupling terms, we show that only Dzyaloshinskii-Moriya
+(DM) interaction can induce spin anisotropy in the ground state when perturbing
+from the isotropic Heisenberg limit. Our work paves the way for a systematic
+study of quantum spin liquids in various materials with a hyperkagome crystal
+structure.",1610.06191v3
+2003-05-16,Spin-orbit coupling and electron spin resonance for interacting electrons in carbon nanotubes,"We review the theoretical description of spin-orbit scattering and electron
+spin resonance in carbon nanotubes. Particular emphasis is laid on the effects
+of electron-electron interactions. The spin-orbit coupling is derived, and the
+resulting ESR spectrum is analyzed both using the effective low-energy field
+theory and numerical studies of finite-size Hubbard chains and two-leg Hubbard
+ladders. For single-wall tubes, the field theoretical description predicts a
+double peak spectrum linked to the existence of spin-charge separation. The
+numerical analysis basically confirms this picture, but also predicts
+additional features in finite-size samples.",0305388v2
+2004-05-04,Bosonization of Luttinger liquids: spin flipping interactions and spin-orbit coupling,"In this thesis we present contributions in the field of the applications of
+quantum field theories techniques to condensed matter models. In chapter 3 we
+investigate on the non covariant fermionic determinant and its connection to
+Luttinger liquids. We address the problem of the regularization of the theory.
+In chapter 4 we treat spin flipping interactions in the non local Thirring
+model and we obtain an effective bosonic actions that describe separated spin
+and charge degrees of freedom. In chapter 4 we apply the self consistent
+harmonic approximation to previously derived bosonic action and we obtain
+potential depending equations for the spectrum gap. In chapter 5 we include
+spin-orbit couplings and compute correlations functions. We show that the spin
+orbit interactions modify the exponents and the phase diagram of the system and
+makes new susceptibilities diverge for low temperature. Finally in chapter 6 we
+summarize the main results and the conclusions.",0405054v1
+2005-10-31,Longitudinal and spin-Hall conductance of a two-dimensional Rashba system with arbitrary disorder,"We calculate the longitudinal and spin-Hall conductances in four-lead bridges
+with Rashba - Dresselhaus spin-orbit interactions. Numerical results are
+obtained both within Landauer-Buttiker formalism and by the direct evaluation
+of the Kubo formula. The microscopic Hamiltonian is obtained in the
+tight-binding approximation in terms of the neareast-neighbor hopping integral
+$t$, the Rashba spin-orbit coupling $V_R$, the Dresselhaus spin-orbit coupling
+$V_D$ and an Anderson-like, on-site disorder energy strength $W$. We reconfirm
+that below a critical disorder threshold, the spin-Hall effect is present.
+Further, we study the effect on the two conductivities of the Fermi energy,
+Rashba/Dresselhaus coefficient ratio, and system size.",0510842v1
+2006-12-04,Quenching of Spin Hall Effect in Ballistic nano-junctions,"We show that a nanometric four-probe ballistic junction can be used to check
+the presence of a transverse spin Hall current in a system with a Spin Orbit
+coupling not of the Rashba type, but rather due to the in-plane electric field.
+Indeed, the spin Hall effect is due to the presence of an effective small
+transverse magnetic field corresponding to the Spin Orbit coupling generated by
+the confining potential. The strength of the field and the junction shape
+characterize the quenching Hall regime, usually studied by applying
+semi-classical approaches. We discuss how a quantum mechanical relativistic
+effect, such as the Spin Orbit one, can be observed in a low energy system and
+explained by using classical mechanics techniques.",0612074v1
+2007-05-24,Local spin dynamic arising from the non-perturbative SU(2) gauge field of the spin orbit effect,"We use the non-perturbative gauge field approach to study the effects of spin
+orbit coupling on the dynamic of magnetic moment. We present a general equation
+of motion (EOM) which unifies i) the spin orbit coupling effect derived from
+the SU(2) spin gauge field, and ii) the moment chirality effect previously
+derived from the topological U(1)xU(1) rotation gauge under the adiabatic
+condition. We present a modified Landau-Liftshitz-Gilbert equation and discuss
+the implication of the modified EOM in various technological applications, such
+as current-induced switching and trajectory of magnetic moments in spin-valve
+multilayers, magnetic memory and diluted magnetic semiconductor.",0705.3502v1
+2009-07-23,Spin Hall effect due to intersubband-induced spin-orbit interaction in symmetric quantum wells,"We investigate the intrinsic spin Hall effect in two-dimensional electron
+gases in quantum wells with two subbands, where a new intersubband-induced
+spin-orbit coupling is operative. The bulk spin Hall conductivity
+$\sigma^z_{xy}$ is calculated in the ballistic limit within the standard Kubo
+formalism in the presence of a magnetic field $B$ and is found to remain finite
+in the B=0 limit, as long as only the lowest subband is occupied. Our
+calculated $\sigma^z_{xy}$ exhibits a nonmonotonic behavior and can change its
+sign as the Fermi energy (the carrier areal density $n_{2D}$) is varied between
+the subband edges. We determine the magnitude of $\sigma^z_{xy}$ for realistic
+InSb quantum wells by performing a self-consistent calculation of the
+intersubband-induced spin-orbit coupling.",0907.4078v2
+2010-11-29,Interplay between Lattice Distortion and Spin-Orbit Coupling in Double Perovskites,"We develop anisotropic pseudo-spin antiferromagnetic Heisenberg models for
+monoclinically distorted double perovskites. We focus on these A$_2$BB'O$_6$
+materials that have magnetic moments on the 4d or 5d transition metal B' ions,
+which form a face-centered cubic lattice. In these models, we consider local
+z-axis distortion of B'-O octahedra, affecting relative occupancy of $t_{2g}$
+orbitals, along with geometric effects of the monoclinic distortion, and
+spin-orbit coupling. The resulting pseudo-spin-1/2 models are solved in the
+saddle-point limit of the Sp(N) generalization of the Heisenberg model. The
+spin S in the SU(2) case generalizes as a parameter $\kappa$ controlling
+quantum fluctuation in the Sp(N) case. We consider two different models that
+may be appropriate for these systems. In particular, using Heisenberg exchange
+parameters for La$_2$LiMoO$_6$ from a spin-dimer calculation, we conclude that
+this pseudo-spin-1/2 system may order, but must be very close to a disordered
+spin liquid state.",1011.6389v2
+2012-12-07,Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors,"We investigate the two-dimensional (2D) highly spin-polarized electron
+accumulation layers commonly appearing near the surface of n-type polar
+semiconductors BiTeX (X = I, Br, and Cl) by angular-resolved photoemission
+spectroscopy. Due to the polarity and the strong spin-orbit interaction built
+in the bulk atomic configurations, the quantized conduction-band subbands show
+giant Rashba-type spin-splitting. The characteristic 2D confinement effect is
+clearly observed also in the valence-bands down to the binding energy of 4 eV.
+The X-dependent Rashba spin-orbit coupling is directly estimated from the
+observed spin-split subbands, which roughly scales with the inverse of the
+band-gap size in BiTeX.",1212.1552v1
+2014-04-17,Effect of spin-orbit interaction on the critical temperature of an ideal Bose gas,"We consider Bose-Einstein condensation of an ideal bose gas with an equal
+mixture of `Rashba' and `Dresselhaus' spin-orbit interactions and study its
+effect on the critical temperature.
+  In uniform bose gas a `cusp' and a sharp drop in the critical temperature
+occurs due to the change in the density of states at a critical Raman coupling
+where the degeneracy of the ground states is lifted. Relative drop in the
+critical temperature depends on the diluteness of the gas as well as on the
+spin-orbit coupling strength. In the presence of a harmonic trap, the cusp in
+the critical temperature smoothened out and a minimum appears. Both the drop in
+the critical temperature and lifting of `quasi-degeneracy' of the ground states
+exhibit crossover phenomena which is controlled by the trap frequency. By
+considering a 'Dicke' like model we extend our calculation to bosons with large
+spin and observe a similar minimum in the critical temperature near the
+critical Raman frequency, which becomes deeper for larger spin. Finally in the
+limit of infinite spin, the critical temperature vanishes at the critical
+frequency, which is a manifestation of Dicke type quantum phase transition.",1404.4500v1
+2015-01-30,Intrinsic Damping of Collective Spin Modes in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling,"A Fermi liquid with spin-orbit coupling (SOC) is expected to support a new
+kind of collective modes: oscillations of magnetization in the absence of the
+magnetic field. We show that these modes are damped by the electron-electron
+interaction even in the limit of an infinitely long wavelength (q = 0). The
+linewidth of the collective mode is on the order of {\Delta}^2=E_F , where
+{\Delta} is a characteristic spin-orbit energy splitting and E_F is the Fermi
+energy. Such damping is in a stark contrast to known damping mechanisms of both
+charge and spin collective modes in the absence of SOC, all of which disappear
+at q = 0, and arises because none of the components of total spin is conserved
+in the presence of SOC.",1502.00027v1
+2015-06-30,Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics,"Hybrids of graphene and two dimensional transition metal dichalcogenides
+(TMDC) have the potential to bring graphene spintronics to the next level. As
+we show here by performing first-principles calculations of graphene on
+monolayer MoS$_2$, there are several advantages of such hybrids over pristine
+graphene. First, Dirac electrons in graphene exhibit a giant global proximity
+spin-orbit coupling, without compromising the semimetallic character of the
+whole system at zero field. Remarkably, these spin-orbit effects can be very
+accurately described by a simple effective Hamiltonian. Second, the Fermi level
+can be tuned by a transverse electric field to cross the MoS$_2$ conduction
+band, creating a system of coupled massive and massles electron gases. Both
+charge and spin transport in such systems should be unique. Finally, we propose
+to use graphene/TMDC structures as a platform for optospintronics, in
+particular for optical spin injection into graphene and for studying spin
+transfer between TMDC and graphene.",1506.08954v1
+2015-08-03,Spin-Spin Coupling in the Solar System,"The richness of dynamical behavior exhibited by the rotational states of
+various solar system objects has driven significant advances in the theoretical
+understanding of their evolutionary histories. An important factor that
+determines whether a given object is prone to exhibiting non-trivial rotational
+evolution is the extent to which such an object can maintain a permanent
+aspheroidal shape, meaning that exotic behavior is far more common among the
+small body populations of the solar system. Gravitationally bound binary
+objects constitute a substantial fraction of asteroidal and TNO populations,
+comprising systems of triaxial satellites that orbit permanently deformed
+central bodies. In this work, we explore the rotational evolution of such
+systems with specific emphasis on quadrupole-quadrupole interactions, and show
+that for closely orbiting, highly deformed objects, both prograde and
+retrograde spin-spin resonances naturally arise. Subsequently, we derive
+capture probabilities for leading order commensurabilities and apply our
+results to the illustrative examples of (87) Sylvia and (216) Kleopatra
+asteroid systems. Cumulatively, our results suggest that spin-spin coupling may
+be consequential for highly elongated, tightly orbiting binary objects.",1508.00616v1
+2015-08-27,"Symmetry, distorted bandstructure, and spin-orbit coupling of (group-III) metal-monochalcogenide monolayers","The electronic structure of (group-III) metal-monochalcogenide monolayers
+exhibits many unusual features. Some, such as the unusually distorted upper
+valence band dispersion we describe as a 'caldera', are primarily the result of
+purely orbital interactions. Others, including spin splitting and wavefunction
+spin-mixing, are directly driven by spin-orbit coupling. We employ elementary
+group theory to explain the origins of these properties, and use a
+tight-binding model to calculate the phenomena enabled by them, such as
+band-edge carrier effective g-factors, optical absorption spectrum, conduction
+electron spin orientation, and a relaxation-induced upper valence band
+population inversion and spin polarization mechanism.",1508.06963v5
+2014-05-09,Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4,"We report on the different roles of two orbital-active Fe$^{2+}$ at the A
+site and V$^{3+}$ at the B site in the magnetic excitations and on the
+anomalous spin wave broadening in FeV$_{2}$O$_{4}$. FeV$_{2}$O$_{4}$ exhibits
+three structural transitions and successive paramagnetic (PM)-collinear
+ferrimagnetic (CFI)-noncollinear ferrimagnetic (NCFI) transitions. The
+high-temperature tetragonal/PM -orthorhombic/CFI transition is accompanied by
+the appearance of an energy gap with a high magnitude in the magnetic
+excitations due to strong spin-orbit coupling induced anisotropy at the
+Fe$^{2+}$ site. While there is no measurable increase in the energy gap from
+the orbital ordering of V$^{3+}$ at the orthorhombic/CFI-tetragonal/NCFI
+transition, anomalous spin wave broadening is observed in the orthorhombic/CFI
+state due to V$^{3+}$ spin fluctuations at the B site. The spin wave broadening
+is also observed at the zone boundary without softening, which is discussed in
+terms of magnon-phonon coupling.",1405.2272v2
+2019-10-24,Algebraic decay of the nonadiabaticity arising through chiral spin transfer torque in magnetic domain walls with Rashba spin-orbit interaction,"Spin transfer torque in a two dimensional electron gas system without space
+inversion symmetry was theoretically investigated by solving the
+Pauli-Schr\""{o}dinger equation for the itinerant electrons inside magnetic
+domain walls. Due to the presence of the Rashba spin-orbit coupling induced by
+the broken inversion symmetry, the spin transfer torque is chiral and the
+nonadiabaticity, which is defined to measure the relative importance of the
+nonadiabatic, field-like torque to the adiabatic, damping-like torque, exhibits
+an inverse power law decay as the domain wall width is increased. This
+algebraic decay is much slower than the exponential decay observed for systems
+without the Rashba spin-orbit coupling, and may find applications in innovative
+design of spintronic devices utilising magnetic topological textures such as
+magnetic domain walls and skyrmions.",1910.11031v3
+2020-04-16,Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors,"We study the exchange interaction between two hole-spin qubits in a double
+quantum dot setup in a silicon nanowire in the presence of magnetic and
+electric fields. Based on symmetry arguments we show that there exists an
+effective spin that is conserved even in highly anisotropic semiconductors,
+provided that the system has a twofold symmetry with respect to the direction
+of the applied magnetic field. This finding facilitates the definition of qubit
+basis states and simplifies the form of exchange interaction for two-qubit
+gates in coupled quantum dots. If the magnetic field is applied along a generic
+direction, cubic anisotropy terms act as an effective spin-orbit interaction
+introducing novel exchange couplings even for an inversion symmetric setup.
+Considering the example of a silicon nanowire double dot, we present the
+relative strength of these anisotropic exchange interaction terms and calculate
+the fidelity of the $\sqrt{\text{SWAP}}$ gate. Furthermore, we show that the
+anisotropy-induced spin-orbit effects can be comparable to that of the direct
+Rashba spin-orbit interaction for experimentally feasible electric field
+strengths.",2004.07658v1
+2018-06-28,Electrical control of the Zeeman spin splitting in two-dimensional hole systems,"Semiconductor holes with strong spin-orbit coupling allow all-electrical spin
+control, with broad applications ranging from spintronics to quantum
+computation. Using a two-dimensional hole system in a GaAs quantum well, we
+demonstrate a new mechanism of electrically controlling the Zeeman splitting,
+which is achieved through altering the hole wave vector $k$. We find a
+threefold enhancement of the in-plane $g-$factor $g_{\parallel}(k)$. We
+introduce a new method for quantifying the Zeeman splitting from
+magnetoresistance measurements, since the conventional tilted field approach
+fails for two-dimensional systems with strong spin-orbit coupling. Finally, we
+show that the Rashba spin-orbit interaction suppresses the in-plane Zeeman
+interaction at low magnetic fields. The ability to control the Zeeman splitting
+with electric fields opens up new possibilities for future quantum spin-based
+devices, manipulating non-Abelian geometric phases, and realising Majorana
+systems in $p-$type superconductor systems.",1806.10817v1
+2021-11-12,Dissipationless Circulating Currents and Fringe Magnetic Fields Near a Single Spin Embedded in a Two-Dimensional Electron Gas,"Theoretical calculations predict the dissipationless circulating current
+induced by a spin defect in a two-dimensional electron gas with spin-orbit
+coupling. The shape and spatial extent of these dissipationless circulating
+currents depend dramatically on the relative strengths of spin-orbit fields
+with differing spatial symmetry, offering the potential to use an electric gate
+to manipulate nanoscale magnetic fields and couple magnetic defects. The
+spatial structure of the magnetic field produced by this current is calculated
+and provides a direct way to measure the spin-orbit fields of the host, as well
+as the defect spin orientation, \textit{e.g.} through scanning nanoscale
+magnetometry.",2111.06770v1
+2022-06-08,Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot,"Hole spins confined in semiconductor quantum dot systems have gained
+considerable interest for their strong spin-orbit interactions (SOIs) and
+relatively weak hyperfine interactions. Here we experimentally demonstrate a
+tunable SOI in a double quantum dot in a Germanium (Ge) hut wire (HW), which
+could help enable fast all-electric spin manipulations while suppressing
+unwanted decoherence. Specifically, we measure the transport spectra in the
+Pauli spin blockade regime in the double quantum dot device.By adjusting the
+interdot tunnel coupling, we obtain an electric field tuned spin-orbit length
+lso = 2.0 - 48.9 nm. This tunability of the SOI could pave the way toward the
+realization of high-fidelity qubits in Ge HW systems.",2206.03653v1
+2024-01-10,Self-generated spin-orbit torque driven by anomalous Hall current,"Spin-orbit torques enable energy-efficient manipulation of magnetization by
+electric current and hold promise for applications ranging from nonvolatile
+memory to neuromorphic computing. Here we report the discovery of a giant
+spin-orbit torque induced by anomalous Hall current in ferromagnetic
+conductors. This anomalous Hall torque is self-generated as it acts on
+magnetization of the ferromagnet that engenders the torque. The magnitude of
+the anomalous Hall torque is sufficiently large to fully negate magnetic
+damping of the ferromagnet, which allows us to implement a microwave spin
+torque nano-oscillator driven by this torque. The peculiar angular symmetry of
+the anomalous Hall torque favors its use over the conventional spin Hall torque
+in coupled nano-oscillator arrays. The universal character of the anomalous
+Hall torque makes it an integral part of the description of coupled spin
+transport and magnetization dynamics in magnetic nanostructures.",2401.05006v1
+1993-01-06,Spin-Orbit Scattering and Pair Breaking in a Structurally Disordered Copper-Oxide Layer,"To leading order in displacement size, the scattering of electrons in a Cu-O
+plane from O displacements perpendicular to that plane is due to spin-orbit
+coupling. This scattering is investigated with the following results: (1) As a
+consequence of time-reversal symmetry, spin fluctuations, which can strongly
+enhance scattering from a spin impurity, do not enhance spin-orbit scattering;
+and (2) for a superconductor with a $d_{x^2-y^2}$ gap function, pair-breaking
+from spin-orbit scattering can be strong, particularly in a structurally
+disordered phase in which locally CuO$_6$ octahedra tilt as in the orthorhombic
+phase of La$_2$CuO$_4$, but globally the average structure is tetragonal. These
+results are discussed in the context of the (La,Nd)-(Sr,Ba)-Cu-O system where
+certain structural transitions are observed to suppress superconductivity.",9301003v2
+2002-03-09,Semiclassical theory of spin-orbit interactions using spin coherent states,"We formulate a semiclassical theory for systems with spin-orbit interactions.
+Using spin coherent states, we start from the path integral in an extended
+phase space, formulate the classical dynamics of the coupled orbital and spin
+degrees of freedom, and calculate the ingredients of Gutzwiller's trace formula
+for the density of states. For a two-dimensional quantum dot with a spin-orbit
+interaction of Rashba type, we obtain satisfactory agreement with fully
+quantum-mechanical calculations. The mode-conversion problem, which arose in an
+earlier semiclassical approach, has hereby been overcome.",0203015v2
+2010-02-10,Disentangling the effects of spin-orbit and hyperfine interactions on spin blockade,"We have achieved the few-electron regime in InAs nanowire double quantum
+dots. Spin blockade is observed for the first two half-filled orbitals, where
+the transport cycle is interrupted by forbidden transitions between triplet and
+singlet states. Partial lifting of spin blockade is explained by spin-orbit and
+hyperfine mechanisms that enable triplet to singlet transitions. The
+measurements over a wide range of interdot coupling and tunneling rates to the
+leads are well reproduced by a simple transport model. This allows us to
+separate and quantify the contributions of the spin-orbit and hyperfine
+interactions.",1002.2120v2
+2012-10-23,Impact of the various spin and orbital ordering processes on multiferroic properties of orthovanadate DyVO3,"The orthovanadate DyVO3 crystal, known to exhibit multiple structural, spin
+and orbital ordering transitions, is presently investigated on the basis of
+magnetization, heat capacity, resistivity, dielectric and polarization
+measurements. Our main result is experimental evidence for the existence of
+multiferroicity below a high TC of 108 K over a wide temperature range
+including different spin-orbital ordered states. The onset of ferroelectricity
+is found to coincide with the antiferromagnetic C-type spin ordering transition
+taking place at 108 K, which indicates that DyVO3 belongs to type II
+multiferroics exhibiting a coupling between magnetism and ferroelectricity.
+Some anomalies detected on the temperature dependence of electric polarization
+are discussed with respect to the nature of the spin-orbital ordered states of
+the V sublattice and the degree of spin alignment in the Dy sublattice. The
+orthovanadates RVO3 (R = rare earth or Y) form an important new category for
+searching for high-TC multiferroics.",1210.6373v3
+2018-04-05,Spin dynamics of the block orbital-selective Mott phase,"Iron-based superconductors display a variety of magnetic phases originating
+in the competition between electronic, orbital, and spin degrees of freedom.
+Previous theoretical investigations of the multi-orbital Hubbard model in one
+dimension revealed the existence of an orbital-selective Mott phase (OSMP) with
+block spin order. Recent inelastic neutron scattering (INS) experiments on the
+BaFe$_2$Se$_3$ ladder compound confirmed the relevance of the block-OSMP.
+Moreover, the powder INS spectrum reveled an unexpected structure, containing
+both low-energy acoustic and high-energy optical modes. Here we present the
+theoretical prediction for the dynamical spin structure factor within a
+block-OSMP regime using the density-matrix renormalization group method. In
+agreement with experiments we find two dominant features: low-energy dispersive
+and high-energy dispersionless modes. We argue that the former represents the
+spin-wave-like dynamics of the block ferromagnetic islands, while the latter is
+attributed to a novel type of local on-site spin excitations controlled by the
+Hund coupling.",1804.01959v2
+2018-05-31,Spin-orbit torque induced dipole skyrmion motion at room temperature,"We demonstrate deterministic control of dipole-field-stabilized skyrmions by
+means of spin-orbit torques arising from heavy transition-metal seed layers.
+Experiments are performed on amorphous Fe/Gd multilayers that are patterned
+into wires and exhibit stripe domains and dipole skyrmions at room temperature.
+We show that while the domain walls and skyrmions are achiral on average due to
+lack of Dzyaloshinskii-Moriya interactions, the N\'eel-like closure domain
+walls at each surface are chiral and can couple to spin-orbit torques. The
+current-induced domain evolutions are reported for different magnetic phases,
+including disordered stripe domains, coexisting stripes and dipole skyrmions
+and a closed packed dipole skyrmion lattice. The magnetic textures exhibit
+motion under current excitations with a current density ~10^8 A/m2. By
+comparing the motion resulting from magnetic spin textures in Fe/Gd films with
+different heavy transition-metal interfaces, we confirm spin currents can be
+used to manipulate achiral dipole skyrmions via spin-orbit torques.",1805.12517v1
+2012-01-18,Crossover from coherent to incoherent scattering in spin-orbit dominated Sr2IrO4,"Strong spin-orbit interaction in the two dimensional compound Sr2IrO4 leads
+to the formation of Jeff=1/2 isospins with unprecedented dynamics. In Raman
+scattering a continuum attributed to double spin scattering is observed. With
+higher excitation energy of the incident Laser this signal crosses over to an
+incoherent background. The characteristic energy scale of this cross over is
+identical to that of intensity resonance effects in phonon scattering. It is
+related to exciton-like orbital excitations that are also evident in resonant
+X-Ray scattering. The crossover and evolution of incoherent excitations are
+proposed to be due to their coupling to spin excitations. This signals a
+spin-orbit induced entanglement of spin, lattice and charge degrees of freedoms
+in Sr2IrO4.",1201.3841v1
+2017-12-20,Understanding the mechanism stabilizing intermediate spin states in Fe(II)-Porphyrin,"Spin fluctuations in Fe(II)-porphyrins are at the heart of heme-proteins
+functionality. Despite significant progress in porphyrin chemistry, the
+mechanisms that rule spin state stabilisation remain elusive. Here, it is
+demonstrated by using multiconfigurational quantum chemical approaches,
+including the novel Stochastic-CASSCF method, that electron delocalization
+between the metal centre and the pi system of the macrocycle differentially
+stabilises the triplet spin states over the quintet. This delocalisation takes
+place via charge-transfer excitations, involving the out-of-plane iron d
+orbitals, key linking orbitals between metal and macrocycle. Through a
+correlated breathing mechanism, the 3d electrons can make transitions towards
+the pi orbitals of the macrocycle. This guarantees a strong coupling between
+the on-site radial correlation on the metal and electron delocalization.
+Opposite-spin 3d electrons of the triplet can effectively reduce electron
+repulsion in this manner. Constraining the out-of-plane orbitals from breathing
+hinders delocalization and reverses the spin ordering. Our results find a
+qualitative analogue in Kekul\'e resonance structures involving also the metal
+centre.",1712.07710v1
+2019-09-30,Highly frustrated magnetism in relativistic $\boldsymbol{d}^\mathbf{4}$ Mott insulators: Bosonic analog of Kitaev honeycomb model,"We study the orbitally frustrated singlet-triplet models that emerge in the
+context of spin-orbit coupled Mott insulators with $t_{2g}^4$ electronic
+configuration. In these compounds, low-energy magnetic degrees of freedom can
+be cast in terms of three-flavor ""triplon"" operators describing the transitions
+between spin-orbit entangled $J=0$ ionic ground state and excited $J=1$ levels.
+In contrast to a conventional, flavor-isotropic O(3) singlet-triplet models,
+spin-orbit entangled triplon interactions are flavor-and-bond selective and
+thus highly frustrated. In a honeycomb lattice, we find close analogies with
+the Kitaev spin model -- an infinite number of conserved quantities, no
+magnetic condensation, and spin correlations being strictly short-ranged.
+However, due to the bosonic nature of triplons, there are no emergent gapless
+excitations within the spin gap, and ground state is a strongly correlated
+paramagnet of dense triplon pairs with no long-range entanglement. Using exact
+diagonalization, we study the bosonic Kitaev model and its various extensions,
+which break exact symmetries of the model and allow magnetic condensation of
+triplons. Possible implications for magnetism of ruthenium oxides are
+discussed.",1910.00074v2
+2020-03-24,Spinning test particle in four-dimensional Einstein-Gauss-Bonnet Black Hole,"In this paper, we investigate the motion of a classical spinning test
+particle orbiting around a static spherically symmetric black hole in a novel
+four-dimensional Einstein-Gauss-Bonnet gravity [D. Glavan and C. Lin, Phys.
+Rev. Lett. 124, 081301 (2020)]. We find that the effective potential of a
+spinning test particle in the background of the black hole has two minima when
+the Gauss-Bonnet coupling parameter $\alpha$ is nearly in a special range
+$-6.1<\alpha/M^2<-2$ ($M$ is the mass of the black hole), which means such
+particle can be in two separate orbits with the same spin angular momentum and
+orbital angular momentum. We also investigate the innermost stable circular
+orbits of the spinning test particle and find that the effect of the particle
+spin on the the innermost stable circular is similar to the case of the
+four-dimensional black hole in general relativity.",2003.10960v3
+2021-06-30,Magnetoelectric effects in superconductors due to spin-orbit scattering: a non-linear $σ$-model description,"We suggest a generalization of nonlinear $\sigma$-model for diffusive
+superconducting systems to account for magnetoelectric effects due to
+spin-orbit scattering. In the leading orders of spin-orbit strength and
+gradient expansion it includes two additional terms responsible for the
+spin-Hall effect and the spin-current swapping. First, assuming a
+delta-correlated disorder we derive the new terms from the Keldysh path
+integral representation of the generating functional. Then we argue
+phenomenologically that they exhaust all invariants allowed in the effective
+action to the leading order in the spin-orbit coupling (SOC). Finally, the
+results are confirmed by a direct derivation of the saddle-point (Usadel)
+equation from the quantum kinetic equations in the presence of randomly
+distributed impurities with SOC. At this point we correct a recent derivation
+of the Usadel equation that includes magneto-electric effects and does not
+resort to the Born approximation.",2106.15859v1
+2023-10-25,Spin-eccentricity interplay in merging binary black holes,"Orbital eccentricity and spin precession are precious observables to infer
+the formation history of binary black holes with gravitational-wave data. We
+present a post-Newtonian, multi-timescale analysis of the binary dynamics able
+to capture both precession and eccentricity over long inspirals. We show that
+the evolution of an eccentric binary can be reduced that of effective source on
+quasi-circular orbits, coupled to a post-Newtonian prescription for the secular
+evolution of the eccentricity. Our findings unveil an interplay between
+precession and eccentricity: the spins of eccentric binaries precess on shorter
+timescales and their nutation amplitude is altered compared to black holes on
+quasi-circular orbits, consequently affecting the so-called spin morphology.
+Even if binaries circularize by the time they enter the sensitivity window of
+our detectors, their spin orientations retain some memory of the past evolution
+on eccentric orbits, thus providing a new link between gravitational-wave
+detection and astrophysical formation. At the same time, we point out that
+residual eccentricity should be considered a source of systematics when
+reconstructing the past history of black-hole binaries using the spin
+orientations.",2310.16893v2
+2024-03-31,Chiral Spin Textures Driven by Emergent Spin-Orbit Interaction: A Numerical Study,"We explore numerically the intricate interplay between Berry phases in both
+real and momentum spaces within itinerant magnets. This interplay manifests as
+an emergent spin-orbit coupling, where charge carriers occupying a Berry-curved
+band generate an orbital magnetization, inducing a pseudo-magnetic field
+originating in chiral spin textures. Using density-matrix-renormalization-group
+techniques, we demonstrate that switching on a band Berry curvature in a
+metallic ferromagnetic phase results in chiral magnetic textures. Furthermore,
+employing a two-leg strip geometry, we establish a connection between charge
+and spin chirality, further supporting this emergent spin-orbit interaction.",2404.00706v3
+2011-09-26,Engineering Dresselhaus spin-orbit coupling for cold atoms in a double tripod configuration,"We study laser induced spin-orbit (SO) coupling in cold atom systems where
+lasers couple three internal states to a pair of excited states, in a double
+tripod topology. Proper choice of laser amplitudes and phases produces a
+Hamiltonian with a doubly degenerate ground state separated from the remaining
+""excited"" eigenstates by gaps determined by the Rabi frequencies of the
+atom-light coupling. After eliminating the excited states with a Born-
+Oppenheimer approximation, the Hamiltonian of the remaining two states includes
+Dresselhaus (or equivalently Rashba) SO coupling. Unlike earlier proposals,
+here the SO coupled states are the two lowest energy ""dressed"" spin states and
+are thus immune to collisional relaxation. Finally, we discuss a specific
+implementation of our system using Raman transitions between different
+hyperfine states within the electronic ground state manifold of nuclear spin I
+= 3/2 alkali atoms.",1109.5481v1
+2022-03-21,Molecular state in a spin-orbital-angular-momentum coupled Fermi gas,"We study the two-body bound states in a spin-orbital-angular-momentum (SOAM)
+coupled quantum gas of fermions. Two different configurations are considered:
+an attractive $s$-wave interaction exists between two spin species that are
+SOAM coupled; and an atom with SOAM coupled internal spins interacts
+state-selectively with another atom. For both cases, we identify the condition
+for the emergence of molecular states with finite total angular momenta.These
+molecular states with quantized total angular momenta correspond to the
+SOAM-coupling-induced vortices in the corresponding Fermi superfluid. We
+propose to detect the molecules through Raman spectroscopy with
+Laguerre-Gaussian lasers. As the molecular states can form above the superfluid
+temperature, they offer an experimentally more accessible route toward the
+study of the underlying pairing mechanism under SOAM coupling.",2203.10834v1
+2022-10-17,Supersolid-like solitons in two-dimensional nonmagnetic spin-orbit coupled spin-1 and spin-2 condensates,"We demonstrate spontaneous generation of spatially-periodic supersolid-like
+super-lattice and stripe solitons in Rashba spin-orbit (SO) coupled spin-1 and
+spin-2 quasi-two-dimensional nonmagnetic Bose-Einstein condensates (BECs). The
+solitons in a weakly SO-coupled spin-1 BEC are circularly-symmetric of $(-1, 0,
++1)$ and $(0, +1, +2)$ types and have inherent vorticity; the numbers in the
+parentheses are the winding numbers in hyper-spin components $+1, 0, -1$,
+respectively. The circularly-symmetric solitons in an SO-coupled spin-2 BEC are
+of types $(-2, -1, 0, +1, +2)$ and $(-1, 0, +1, +2, +3)$ with the former being
+the ground state, where the winding numbers correspond to spin components $+2,
++1, 0, -1, -2$, respectively. For stronger SO-coupling strengths, these
+solitons acquire a multiring structure while preserving the winding numbers.
+Quasi-degenerate stripe and super-lattice solitons, besides a
+circularly-asymmetric soliton, also emerge as excited stationary states for
+stronger SO-coupling strengths in spin-1 and spin-2 BECs. pla-cl.tex",2210.08947v1
+2017-10-31,Kitaev-Heisenberg Hamiltonian for High-Spin $d^7$ Mott Insulators,"In the search for quantum spin liquids, candidate materials for the Kitaev
+model and its extensions have been intensively explored during the past decade,
+as the models realize the exact quantum spin liquids in the ground state. Thus
+far, insulating magnets in the low-spin $d^5$ electron configuration under the
+strong spin-orbit coupling have been studied for realizing the Kitaev-type
+bond-dependent anisotropic interactions between the spin-orbital entangled
+Kramers doublets. To extend the candidates, here we investigate the systems in
+a high-spin $d^7$ electron configuration, whose ground state is described by
+the spin-orbital entangled Kramers doublet. By the second- order perturbation
+in terms of the $t_{2g}$-$t_{2g}$ and $t_{2g}$-$e_g$ hoppings, we show that the
+effective spin model possesses the anisotropic Kitaev interactions as well as
+the isotropic Heisenberg ones. While the Kitaev interaction is always
+ferromagnetic, the Heisenberg interaction can become either ferromagnetic or
+antiferromagnetic depending on the Coulomb interactions and the crystalline
+electric fields. We also derive the effective model for the low-spin $d^5$
+electron configuration within the same perturbation scheme, in which the Kitaev
+interaction becomes both ferromagnetic and antiferromagnetic, while the
+Heisenberg one always ferromagnetic. Referring to the previous study for the
+Kitaev-Heisenberg model, we find that the quantum spin liquid phase exists in
+the reasonable parameter region in both $d^7$ and $d^5$ cases, while the former
+has a richer structure of the phase diagram. We discuss the advantages of the
+$d^7$ case in comparison with the $d^5$ case. Our results indicate that the
+high-spin $d^7$ state provides another platform for the Kitaev-type quantum
+spin liquid.",1710.11357v2
+2017-08-29,The translational side of topological band insulators,"Spin-orbit coupled materials have attracted revived prominent research
+interest as of late, especially due their direct connection with topological
+notions. Arguably, a hallmark of this pursuit is formed by the concept of the
+topological band insulator (TBI). In these incompressible systems band
+inversions, often driven by strong spin-orbit coupling, result in a state that
+is topologically distinct from the usual insulator as long as time reversal
+symmetry is maintained. More generally, topological states that arise by virtue
+of a protecting symmetry have resulted in a flourishing research field on both
+the experimental as well as theoretical side of the condensed matter agenda. As
+a prime signature topological band insulators can exhibit protected spin
+filtered edge states, whose time reversal invariant partner is spatially
+separated on the other edge. While these edge states have resultantly been
+identified with many exotic physical phenomena, we here wish to provide a
+perspective on the equally rich, although far less explored, aspects of the
+bulk. That is, we will focus on the role of lattice defects, dislocations in
+particular, and their relation with the topological nature of the bulk.",1708.08886v1
+2017-04-03,Fulde-Ferrell-Larkin-Ovchinnikov state in spin-orbit-coupled superconductors,"We show that in the presence of magnetic field, two superconducting phases
+with the center-of-mass momentum of Cooper pair parallel to the magnetic field
+are induced in spin-orbit-coupled superconductor Li$_2$Pd$_3$B. Specifically,
+at small magnetic field, the center-of-mass momentum is induced due to the
+energy-spectrum distortion and no unpairing region with vanishing singlet
+correlation appears. We refer to this superconducting state as the drift-BCS
+state. By further increasing the magnetic field, the superconducting state
+falls into the Fulde-Ferrell-Larkin-Ovchinnikov state with the emergence of the
+unpairing regions. The observed abrupt enhancement of the center-of-mass
+momenta and suppression on the order parameters during the crossover indicate
+the first-order phase transition. Enhanced Pauli limit and hence enlarged
+magnetic-field regime of the Fulde-Ferrell-Larkin-Ovchinnikov state, due to the
+spin-flip terms of the spin-orbit coupling, are revealed. We also address the
+triplet correlations induced by the spin-orbit coupling, and show that the
+Cooper-pair spin polarizations, generated by the magnetic field and
+center-of-mass momentum with the triplet correlations, exhibit totally
+different magnetic-field dependences between the drift-BCS and
+Fulde-Ferrell-Larkin-Ovchinnikov states.",1704.00409v1
+2022-11-03,Spin-orbit and exchange proximity couplings in graphene/1T-TaS$_2$ heterostructure triggered by a charge density wave,"Proximity-induced fine features and spin-textures of the electronic bands in
+graphene-based van der Waals heterostructures can be explored from the point of
+tailoring a twist angle. Here we study spin-orbit coupling and exchange
+coupling engineering of graphene states in the proximity of 1T-TaS$_2$ not
+triggering the twist, but a charge density wave in 1T-TaS$_2$-a realistic
+low-temperature phase. Using density functional theory and effective model we
+found that the emergence of the charge density wave in 1T-TaS$_2$ significantly
+enhances Rashba spin-orbit splitting in graphene and tilts the spin texture by
+a significant Rashba angle-in a very similar way as in the conventional
+twist-angle scenarios. Moreover, the partially filled Ta $d$-band in the charge
+density wave phase leads to the spontaneous emergence of the in-plane magnetic
+order that transgresses via proximity from 1T-TaS$_2$ to graphene, hence,
+simultaneously superimposing along the spin-orbit also the exchange coupling
+proximity effect. To describe this intricate proximity landscape we have
+developed an effective model Hamiltonian and provided a minimal set of
+parameters that excellently reproduces all the spectral features predicted by
+the first-principles calculations. Conceptually, the charge density wave
+provides a highly interesting knob to control the fine features of electronic
+states and to tailor the superimposed proximity effects-a sort of twistronics
+without twist.",2211.02153v2
+2019-05-20,Orbitally Dominated Rashba-Edelstein Effect in Noncentrosymmetric Antiferromagnets,"Efficient manipulation of magnetic order with electric current pulses is
+desirable for achieving fast spintronic devices. The Rashba-Edelstein effect,
+wherein a spin polarization is electrically induced in noncentrosymmetric
+systems, provides a mean to achieve current-induced staggered spin-orbit
+torques. Initially predicted for spin, the orbital counterpart of this effect
+has been disregarded up to now. Here, we present a generalized Rashba-Edelstein
+effect, which generates not only spin polarization but also orbital
+polarization, which we find to be far from being negligible and could play a
+crucial role in the magnetization dynamics. We show that the orbital
+Rashba-Edelstein effect does not require spin-orbit coupling to exist. We
+present first-principles calculations of the frequency-dependent spin and
+orbital Rashba-Edelstein susceptibility tensors for the noncentrosymmetric
+antiferromagnets CuMnAs and Mn2Au. We show that the electrically induced local
+magnetization has both staggered in-plane components and non-staggered
+out-of-plane components, and can exhibit Rashba-like or Dresselhaus-like
+symmetries, depending on the magnetic configuration. Furthermore, there is an
+induced local magnetization on the nonmagnetic atoms as well, that is smaller
+in Mn2Au than in CuMnAs. We compute sizable induced magnetizations at optical
+frequencies, which suggest that electric-field driven switching could be
+achieved at much higher frequencies.",1905.08279v1
+2017-05-12,Orbital-selective Mott phase in multiorbital models for iron pnictides and chalcogenides,"There is increasing recognition that the multiorbital nature of the 3d
+electrons is important to the proper description of the electronic states in
+the normal state of the iron-based superconductors. Earlier studies of the
+pertinent multiorbital Hubbard models identified an orbital-selective Mott
+phase, which anchors the orbital-selective behavior seen in the overall phase
+diagram. An important characteristics of the models is that the orbitals are
+kinetically coupled -- i.e. hybridized -- to each other, which makes the
+orbital-selective Mott phase especially nontrivial. A U(1) slave-spin method
+was used to analyze the model with nonzero orbital-level splittings. Here we
+develop a Landau free-energy functional to shed further light on this issue. We
+put the microscopic analysis from the U(1) slave-spin approach in this
+perspective, and show that the intersite spin correlations are crucial to the
+renormalization of the bare hybridization amplitude towards zero and the
+concomitant realization of the orbital-selective Mott transition. Based on this
+insight, we discuss additional ways to study the orbital-selective Mott physics
+from a dynamical competition between the interorbital hybridization and
+collective spin correlations. Our results demonstrate the robustness of the
+orbital-selective Mott phase in the multiorbital models appropriate for the
+iron-based superconductors.",1705.04541v1
+2013-04-11,Intrinsic Spin Hall Effect at Oxide Interfaces: a Simple Model,"An asymmetric triangular potential well provides the simplest model for the
+confinement of mobile electrons at the interface between two insulating oxides,
+such as LaAlO_3 and SrTiO_3 (LAO/STO). These electrons have been recently shown
+to exhibit a large spin-orbit coupling of the Rashba type, i.e., linear in the
+in-plane momentum. In this paper we study the intrinsic spin Hall effect due to
+Rashba coupling in an asymmetric triangular potential well. Besides splitting
+each subband into two branches of opposite helicity, the spin-orbit interaction
+causes the wave function in the direction perpendicular to the plane of the
+quantum well (the z direction) to depend on the in-plane wave vector k. In
+contrast to the extreme asymmetric case, i.e., the wedge-shaped quantum well,
+for which the intrinsic spin Hall effect vanishes due to vertex corrections, we
+find that the asymmetric well supports a non-vanishing intrinsic spin Hall
+conductivity, which increases in magnitude as the well becomes more symmetric.
+The spin Hall conductivity is found to be proportional to the square of the
+spin-orbit coupling constant and, in the limit of low carrier density, depends
+only on the effective mass renormalization associated with the k-dependence of
+the wave functions in the z direction. Its origin lies in the non-vanishing
+matrix elements of the spin current between subbands corresponding to different
+states of quantized motion perpendicular to the plane of the well.",1304.3476v2
+2014-11-11,Magnonic Charge Pumping via Spin-Orbit Coupling,"The interplay between spin, charge, and orbital degrees of freedom has led to
+the development of spintronic devices like spin-torque oscillators, spin-logic
+devices, and spin-transfer torque magnetic random-access memories. In this
+development spin pumping, the process where pure spin-currents are generated
+from magnetisation precession, has proved to be a powerful method for probing
+spin physics and magnetisation dynamics. The effect originates from direct
+conversion of low energy quantised spin-waves in the magnet, known as magnons,
+into a flow of spins from the precessing magnet to adjacent normal metal leads.
+The spin-pumping phenomenon represents a convenient way to electrically detect
+magnetisation dynamics, however, precessing magnets have been limited so far to
+pump pure spin currents, which require a secondary spin-charge conversion
+element such as heavy metals with large spin Hall angle or multi-layer layouts
+to be detectable. Here, we report the experimental observation of charge
+pumping in which a precessing ferromagnet pumps a charge current, demonstrating
+direct conversion of magnons into high-frequency currents via the relativistic
+spin-orbit interaction. The generated electric current, differently from spin
+currents generated by spin-pumping, can be directly detected without the need
+of any additional spin to charge conversion mechanism and amplitude and phase
+information about the relativistic current-driven magnetisation dynamics. The
+charge-pumping phenomenon is generic and gives a deeper understanding of the
+recently observed spin-orbit torques, of which it is the reciprocal effect and
+which currently attract interest for their potential in manipulating magnetic
+information. Furthermore, charge pumping provides a novel link between
+magnetism and electricity and may find application in sourcing alternating
+electric currents.",1411.2779v1
+2004-01-29,Rashba spin-orbit coupling and spin relaxation in silicon quantum wells,"Silicon is a leading candidate material for spin-based devices, and
+two-dimensional electron gases (2DEGs) formed in silicon heterostructures have
+been proposed for both spin transport and quantum dot quantum computing
+applications. The key parameter for these applications is the spin relaxation
+time. Here we apply the theory of D'yakonov and Perel' (DP) to calculate the
+electron spin resonance linewidth of a silicon 2DEG due to structural inversion
+asymmetry for arbitrary static magnetic field direction at low temperatures. We
+estimate the Rashba spin-orbit coupling coefficient in silicon quantum wells
+and find the $T_{1}$ and $T_{2}$ times of the spins from this mechanism as a
+function of momentum scattering time, magnetic field, and device-specific
+parameters. We obtain agreement with existing data for the angular dependence
+of the relaxation times and show that the magnitudes are consistent with the DP
+mechanism. We suggest how to increase the relaxation times by appropriate
+device design.",0401615v2
+2006-10-04,Mesoscopic Spin Hall Effect,"We investigate the spin Hall effect in ballistic chaotic quantum dots with
+spin-orbit coupling. We show that a longitudinal charge current can generate a
+pure transverse spin current. While this transverse spin current is generically
+nonzero for a fixed sample, we show that when the spin-orbit coupling time is
+large compared to the mean dwell time inside the dot, it fluctuates universally
+from sample to sample or upon variation of the chemical potential with a
+vanishing average. For a fixed sample configuration, the transverse spin
+current has a finite typical value ~e^2 V/h, proportional to the longitudinal
+bias V on the sample, and corresponding to about one excess open channel for
+one of the two spin species. Our analytical results are in agreement with
+numerical results in a diffusive system [W. Ren et al., Phys. Rev. Lett. 97,
+066603 (2006)] and are further confirmed by numerical simulation in a chaotic
+cavity.",0610109v1
+2008-05-28,Electric field-induced spin textures in a superlattice with Rashba and Dresselhaus spin-orbit coupling,"The DC charge current, field-induced spin polarization and spin textures are
+studied in the 1D gated superlattice with both fixed and varying Rashba and
+Dresselhaus contributions to spin-orbit coupling. It is found that a spin
+component with zero mean value can demonstrate non-vanishing field-induced spin
+texture in a superlattice cell which can be probed experimentally, with the
+highest amplitudes achievable in an interval of comparable Rashba and
+Dresselhaus terms. The consideration of the finite parameters for collision
+rate and temperature is found to be non-destructive for the calculated current
+and spin characteristics depending on all states below the Fermi level.",0805.4284v3
+2009-05-26,Infinite spin diffusion length of any spin polarization along direction perpendicular to effective magnetic field from Dresselhaus and Rashba spin-orbit couplings with identical strengths in (001) GaAs quantum wells,"In this note, we show that the latest spin grating measurement of spin helix
+by Koralek {\em et al.} [Nature {\bf 458}, 610 (2009)] provides strong evidence
+of the infinite spin diffusion length of any spin polarization along the
+direction perpendicular to the effective magnetic field from the
+  Dresselhaus and Rashba spin-orbit couplings with identical strengths in
+$(001)$ GaAs quantum wells, predicted by Cheng {\em et al.} [Phys. Rev. B {\bf
+75}, 205328 (2007)].",0905.4207v2
+2009-11-18,Strong electron spin-Hall effect by a coherent optical potential,"We demonstrate theoretically that a coherent manipulation of electron spins
+in low-dimensional semiconductor structures with spin-orbit coupling by
+infrared radiation is possible. The proposed approach is based on using a
+dipole force acting on a two-level system in a nonuniform optical field,
+similar to that employed in the design of the cold atoms diode. For ballistic
+electrons the spin-dependent force, proportional to the intensity of external
+radiation, leads to a spin-Hall effect and resulting spin separation even if
+the spin-orbit coupling itself does not allow for these effects. Achievable
+spatial separation of electrons with opposite spins can be of the order of
+several tenth of a micron, an order of magnitude larger than can be produced by
+the charged impurity scattering in the diffusive regime.",0911.3577v2
+2010-03-10,Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot,"We study the relaxation of a single electron spin in a circular gate-tunbable
+quantum dot in gapped graphene. Direct coupling of the electron spin to
+out-of-plane phonons via the intrinsic spin-orbit coupling leads to a
+relaxation time T_1 which is independent of the B-field at low fields. We also
+find that Rashba spin-orbit induced admixture of opposite spin states in
+combination with the emission of in-plane phonons provides various further
+relaxation channels via deformation potential and bond-length change. In the
+absence of valley mixing, spin relaxation takes place within each valley
+separately and thus time-reversal symmetry is effectively broken, thus
+inhibiting the van Vleck cancellation at B=0 known from GaAs quantum dots. Both
+the absence of the van Vleck cancellation as well as the out-of-plane phonons
+lead to a behavior of the spin relaxation rate at low magnetic fields which is
+markedly different from the known results for GaAs. For low B-fields, we find
+that the rate is constant in B and then crosses over to ~B^2 or ~B^4 at higher
+fields.",1003.2088v1
+2010-10-27,Coupling molecular spin states by photon-assisted tunneling,"Artificial molecules containing just one or two electrons provide a powerful
+platform for studies of orbital and spin quantum dynamics in nanoscale devices.
+A well-known example of these dynamics is tunneling of electrons between two
+coupled quantum dots triggered by microwave irradiation. So far, these
+tunneling processes have been treated as electric dipole-allowed
+spin-conserving events. Here we report that microwaves can also excite
+tunneling transitions between states with different spin. In this work, the
+dominant mechanism responsible for violation of spin conservation is the
+spin-orbit interaction. These transitions make it possible to perform detailed
+microwave spectroscopy of the molecular spin states of an artificial hydrogen
+molecule and open up the possibility of realizing full quantum control of a two
+spin system via microwave excitation.",1010.5682v1
+2011-08-09,Selective probing of photo-induced charge and spin dynamics in the bulk and surface of a topological insulator,"Topological insulators possess completely different spin-orbit coupled bulk
+and surface electronic spectra that are each predicted to exhibit exotic
+responses to light. Here we report time-resolved fundamental and second
+harmonic optical pump-probe measurements on the topological insulator Bi2Se3 to
+independently measure its photo-induced charge and spin dynamics with bulk and
+surface selectivity. Our results show that a transient net spin density can be
+optically induced in both the bulk and surface, which may drive spin transport
+in topological insulators. By utilizing a novel rotational anisotropy analysis
+we are able to separately resolve the spin de-polarization, intraband cooling
+and interband recombination processes following photo-excitation, which reveal
+that spin and charge degrees of freedom relax on very different time scales
+owing to strong spin-orbit coupling.",1108.1848v1
+2011-10-24,Readout of carbon nanotube vibrations based on spin-phonon coupling,"We propose a scheme for spin-based detection of the bending motion in
+suspended carbon-nanotubes, using the curvature-induced spin-orbit interaction.
+We show that the resulting effective spin-phonon coupling can be used to
+down-convert the high-frequency vibration-modulated spin-orbit field to
+spin-flip processes at a much lower frequency. This vibration-induced
+spin-resonance can be controlled with an axial magnetic field. We propose a
+Pauli spin blockade readout scheme and predict that the leakage current shows
+pronounced peaks as a function of the external magnetic field. Whereas the
+resonant peaks allow for frequency readout, the slightly off-resonant current
+is sensitive to the vibration amplitude.",1110.5165v1
+2012-11-05,A unified theory of spin-relaxation due to spin-orbit coupling in metals and semiconductors,"Spintronics is an emerging paradigm with the aim to replace conventional
+electronics by using electron spins as information carriers. Its utility relies
+on the magnitude of the spin-relaxation, which is dominated by spin- orbit
+coupling (SOC). Yet, SOC induced spin-relaxation in metals and semiconductors
+is discussed for the seemingly orthogonal cases when inversion symmetry is
+retained or broken by the so-called Elliott-Yafet and Dyakonov-Perel
+spin-relaxation mechanisms, respectively. We unify the two theories on general
+grounds for a generic two-band system containing intra- and inter-band SOC.
+While the previously known limiting cases are recovered, we also identify
+parameter domains when a crossover occurs between them, i.e. when an inversion
+symmetry broken state evolves from a Dyakonov-Perel to an Elliott-Yafet type of
+spin-relaxation and conversely for a state with inversional symmetry. This
+provides an ultimate link between the two mechanisms of spin-relaxation.",1211.0826v2
+2014-02-17,Effects of Rashba spin-orbit coupling and a magnetic field on a polygonal quantum ring,"Using standard quantum network method, we analytically investigate the effect
+of Rashba spin-orbit coupling (RSOC) and a magnetic field on the spin transport
+properties of a polygonal quantum ring. Using Landauer-Buttiker formula, we
+have found that the polarization direction and phase of transmitted electrons
+can be controlled by both the magnetic field and RSOC. A device to generate a
+spin-polarized conductance in a polygon with an arbitrary number of sides is
+discussed. This device would permit precise control of spin and selectively
+provide spin filtering for either spin up or spin down simply by interchanging
+the source and drain.",1402.3868v1
+2014-11-03,Experimental Demonstration of the Co-existence of the Spin Hall and Rashba Effects in beta-Tantalum/Ferromagnet Bilayers,"We have measured the spin torques of beta-Tantalum / Co20Fe60B20 bilayers
+versus Ta thickness at room temperature using an FMR technique. The spin Hall
+coefficient was calculated both from the observed change in damping coefficient
+of the ferromagnet with Ta thickness, and from the ratio of the symmetric and
+anti-symmetric components of the FMR signal. Results from these two methods
+yielded values for the spin Hall coefficient of -0.090+/-0.005 and
+-0.11+/-0.01, respectively. We have also identified a significant out-of-plane
+spin torque originating from Ta, which is constant with Ta thickness. We
+ascribe this to an interface spin orbit coupling, or Rashba effect, due to the
+strength and constancy of the torque with Ta thickness. From fitting measured
+data to a model including interface spin orbit coupling, we have determined the
+spin diffusion length for beta-Tantalum to be ~2.5 nm.",1411.0601v1
+2015-03-18,Signatures of pairing and spin-orbit coupling in correlation functions of Fermi gases,"We derive expressions for spin and density correlation functions in the
+(greatly enhanced) pseudogap phase of spin-orbit coupled Fermi superfluids.
+Density-density correlation functions are found to be relatively insensitive to
+the presence of these Rashba effects. To arrive at spin-spin correlation
+functions we derive new $f$-sum rules, valid even in the absence of a spin
+conservation law. Our spin-spin correlation functions are shown to be fully
+consistent with these $f$-sum rules. Importantly, they provide a clear
+signature of the Rashba band-structure and separately help to establish the
+presence of a pseudogap.",1503.05454v1
+2015-04-06,Incomplete Protection of the Surface Weyl Cones of the Kondo Insulator SmB$_6$: Spin Exciton Scattering,"The compound SmB$_6$ is a Kondo Insulator, where the lowest-energy bulk
+electronic excitations are spin excitons. It also has surface states that are
+subjected to strong spin-orbit coupling. It has been suggested that SmB$_6$ is
+also a topological insulator. Here we show that, despite the absence of
+time-reversal symmetry breaking and the presence of strong spin-orbit coupling,
+the chiral spin texture of the Weyl cone is not completely protected. In
+particular, we show that the spin-exciton mediated scattering produces features
+in the surface electronic spectrum at energies separated from the surface Fermi
+energy by the spin-exciton energy. Despite the features being far removed from
+the surface Fermi energy, they are extremely temperature dependent. The
+temperature variation occurs over a characteristic scale determined by the
+dispersion of the spin exciton. The structures may be observed by electron
+spectroscopy at low temperatures.",1504.01179v1
+2015-11-14,Dynamics of spin-orbit coupled Bose-Einstein condensates in a random potential,"Disorder plays a crucial role in spin dynamics in solids and condensed matter
+systems. We demonstrate that for a spin-orbit coupled Bose-Einstein condensate
+in a random potential two mechanisms of spin evolution, that can be
+characterized as ""precessional"" and ""anomalous"", are at work simultaneously.
+The precessional mechanism, typical for solids, is due to the condensate
+displacement. The unconventional ""anomalous"" mechanism is due to the
+spin-dependent velocity producing the distribution of the condensate spin
+polarization. The condensate expansion is accompanied by a random displacement
+and fragmentation, where it becomes sparse, as clearly revealed in the spin
+dynamics. Thus, different stages of the evolution can be characterized by
+looking at the condensate spin.",1511.04588v1
+2015-11-24,Inverse Spin Hall Effect from pulsed Spin Current in Organic Semiconductors with Tunable Spin-Orbit Coupling,"Exploration of spin-currents in organic semiconductors (OSECs) induced by
+resonant microwave absorption in ferromagnetic substrates has been of great
+interest for potential spintronics applications. Due to the inherently weak
+spin-orbit coupling (SOC) of OSECs, their inverse spin Hall effect (ISHE)
+response is very subtle; limited by the microwave power applicable under
+continuous-wave (cw) excitation. Here we introduce a novel approach for
+generating significant ISHE signals using pulsed ferromagnetic resonance, where
+the ISHE is ~2-3 orders of magnitude larger compared to cw excitation. This
+strong ISHE enables us to investigate a variety of OSECs ranging from
+pi-conjugated polymers with strong SOC that contain intrachain platinum atoms,
+to weak SOC polymers, to C60 films, where the SOC is predominantly caused by
+the molecule surface curvature. The pulsed-ISHE technique offers a robust route
+for efficient injection and detection schemes of spin-currents at room
+temperature, and paves the way for spin-orbitronics in plastic materials.",1511.07848v1
+2016-03-10,Spin Hall Effect in a Spinor Dipolar Bose-Einstein Condensate,"We theoretically show that the spin Hall effect arises in a Bose-Einstein
+condensate (BEC) of neutral atoms interacting via the magnetic dipole-dipole
+interactions (MDDIs). Since the MDDI couples the total spin angular momentum
+and the relative orbital angular momentum of two colliding atoms, it works as a
+spin-orbit coupling. Thus, when we prepare a BEC in a magnetic sublevel $m=0$,
+thermally and quantum-mechanically excited atoms in the $m=1$ and $-1$ states
+feel the Lorentz-like foces in the opposite directions. This is the origin for
+the emergence of the the spin Hall effect. We define the mass-current and
+spin-current operators from the equations of continuity and calculate the spin
+Hall conductivity from the off-diagonal current-current correlation function
+within the Bogoliubov approximation. We find that the correction of the current
+operators due to the MDDI significantly contributes to the spin Hall
+conductivity. Possible experimental situation is also discussed.",1603.03202v1
+2018-01-17,Spin-Orbit Coupling and Topological States in $F=\frac{3}{2}$ Cold Fermi Gas,"In this work we study the possible occurrence of topological insulators for
+2D fermions of high spin. They can be realized in cold fermion systems with
+ground-state atomic spin $F>\tfrac{1}{2}$, if the optical potential is properly
+designed, and spin-orbit coupling is relevant. The latter is shown to be
+induced by letting the fermions interact with a specially tuned arrangement of
+polarized laser beams. When the system is subject to a perpendicular magnetic
+field, time reversal symmetry is broken but the ensuing Hamiltonian is still
+endowed with a mirror symmetry.
+  Topological insulators for fermions of higher spins are fundamentally
+distinct from those pertaining to spin $\frac{1}{2}$. The underlying physics
+reveals a plethora of positive and negative mirror Chern numbers, respectively
+corresponding to chiral and anti-chiral edge states. Here, for simplicity, we
+concentrate on the case $F=\tfrac{3}{2}$ (which is suitable for $^{6}$Li or
+$^2$H atoms) but extension to higher spins (such as $^{40}$K whose ground-state
+spin is $F=\tfrac{9}{2}$), is straightforward.",1801.05646v4
+2019-06-06,Charge noise induced spin dephasing in a nanowire double quantum dot with spin-orbit coupling,"Unexpected fluctuating charge field near a semiconductor quantum dot has
+severely limited the coherence time of the localized spin qubit. It is the
+interplay between the spin-orbit coupling and the asymmetrical confining
+potential in a quantum dot, that mediates the longitudinal interaction between
+the spin qubit and the fluctuating charge field. Here, we study the $1/f$
+charge noise induced spin dephasing in a nanowire double quantum dot via
+exactly solving its eigen-energies and eigenfunctions. Our calculations
+demonstrate that the spin dephasing has a nonmonotonic dependence on the
+asymmetry of the double quantum dot confining potential. With the increase of
+the potential asymmetry, the dephasing rate first becomes stronger very sharply
+before reaching to a maximum, after that it becomes weaker softly. Also, we
+find that the applied external magnetic field contributes to the spin
+dephasing, the dephasing rate is strongest at the anti-crossing point $B_{0}$
+in the double quantum dot.",1906.02378v3
+2019-07-02,Non-linear spin filter for non-magnetic materials at zero magnetic field,"The ability to convert spin accumulation to charge currents is essential for
+applications in spintronics. In semiconductors, spin-to-charge conversion is
+typically achieved using the inverse spin Hall effect or using a large magnetic
+field. Here we demonstrate a general method that exploits the non-linear
+interactions between spin and charge currents to perform all-electrical, rapid
+and non-invasive detection of spin accumulation without the need for a magnetic
+field. We demonstrate the operation of this technique with ballistic GaAs holes
+as a model system with strong spin-orbit coupling, in which a quantum point
+contact provides the non-linear energy filter. This approach is generally
+applicable to electron and hole systems with strong spin orbit coupling.",1907.01312v3
+2012-05-09,Full electrostatic control over polarized currents through spin-orbital Kondo effect,"Numerical calculations indicate that by suitably controlling the individual
+gate voltages of a capacitively coupled parallel double quantum dot, with each
+quantum dot coupled to one of two independent non-magnetic channels, this
+system can be set into a spin-orbital Kondo state by applying a magnetic field.
+This Kondo regime, closely related to the SU(4) Kondo, flips spin from one to
+zero through cotunneling processes that generate almost totally spin-polarized
+currents with opposite spin orientation along the two channels. Moreover, by
+appropriately changing the gate voltages of both quantum dots, one can
+simultaneously flip the spin polarization of the currents in each channel. As a
+similar zero magnetic field Kondo effect has been recently observed by Y.
+Okazaki {\it et al.} [Phys. Rev. B {\bf 84}, (R)161305 (2011)], we analyze a
+range of magnetic field values where this polarization effect seems robust,
+suggesting that the setup may be used as an efficient bipolar spin filter,
+which can generate electrostatically reversible spatially separated spin
+currents with opposite polarizations.",1205.2115v1
+2019-01-23,Correspondence between bulk equilibrium spin-currents and edge spin accumulation in wires with spin-orbit coupling,"We demonstrate that the interplay of Zeeman and spin-orbit coupling fields in
+a 1D wire leads to an equilibrium spin current that manifests itself in a spin
+accumulation at the wire ends with a polarization perpendicular to both fields.
+This is a universal property that occurs in the normal and superconducting
+state independently of the degree of disorder. We find that the edge spin
+polarization transverse to the Zeeman field is strongly enhanced in the
+superconducting state when the Zeeman energy is of the order of the
+superconducting gap. By calculating the space resolved magnetization response
+of the wire we demonstrate that the transverse component of the spin at the
+wire edges can be much larger than the one parallel to the field. This result
+generalizes the well established theory of the Knight-shift in superconductors
+to the case of finite systems.",1901.07890v1
+2020-11-19,Spin Structure and Resonant Driving of Spin-1/2 Defects in SiC,"Transition metal (TM) defects in silicon carbide have favorable spin
+coherence properties and are suitable as quantum memory for quantum
+communication. To characterize TM defects as quantum spin-photon interfaces, we
+model defects that have one active electron with spin 1/2 in the atomic $D$
+shell. The spin structure, as well as the magnetic and optical resonance
+properties of the active electron emerge from the interplay of the crystal
+potential and spin-orbit coupling and are described by a general model derived
+using group theory. We find that the spin-orbit coupling leads to additional
+allowed transitions and a modification of the $g$-tensor. To describe the
+dependence of the Rabi frequency on the magnitude and direction of the static
+and driving fields, we derive an effective Hamiltonian. This theoretical
+description can also be instrumental to perform and optimize spin control in TM
+defects.",2011.09987v1
+2021-03-29,Photonic spin lattices: symmetry constraints for skyrmion and meron topologies,"Symmetry governs many electronic and photonic phenomena in optics and
+condensed matter physics. Skyrmions and merons are prominent topological
+structures in magnetic materials, with the topological features determined by
+the interplay between anisotropy of a material and its magnetization. Here we
+theoretically show and experimentally demonstrate that the symmetry of the
+electromagnetic field determines the spin topological properties of the guided
+modes via spin-orbit coupling and may only result in either hexagonal
+spin-skyrmion or square spin-meron lattices. We also show that in the absence
+of spin-orbit coupling these spin topologies are degenerated in dynamic
+field-skyrmions, unifying description of electromagnetic field topologies. The
+results provide new understanding of electromagnetic field topology and its
+transformations as well as new opportunities for applications in quantum
+optics, spin-optics and topological photonics.",2103.15366v1
+2021-06-28,The emergent linear Rashba spin-orbit coupling offering the fast manipulation of hole-spin qubits in germanium,"The electric dipole spin resonance (EDSR) combining strong spin-orbit
+coupling (SOC) and electric-dipole transitions facilitates fast spin control in
+a scalable way, which is the critical aspect of the rapid progress made
+recently in germanium (Ge) hole-spin qubits. However, a puzzle is raised
+because centrosymmetric Ge lacks the Dresselhaus SOC, a key element in the
+initial proposal of the hole-based EDSR. Here, we demonstrate that the recently
+uncovered finite k-linear Rashba SOC of 2D holes offers fast hole spin control
+via EDSR with Rabi frequencies in excellent agreement with experimental results
+over a wide range of driving fields. We also suggest that the Rabi frequency
+can reach 500 MHz under a higher gate electric field or multiple GHz in a
+replacement by [110]oriented wells. These findings bring a deeper understanding
+for hole-spin qubit manipulation and offer design principles to boost the gate
+speed.",2106.14684v2
+2021-11-05,Relativistic first-order spin hydrodynamics via the Chapman-Enskog expansion,"In this paper, we present a detailed derivation of relativistic first-order
+spin hydrodynamics using the Chapman-Enskog method to linearize the nonlocal
+collision term for massive fermions proposed in \cite{Weickgenannt:2021cuo},
+which well describes spin-orbit coupling in the collision process and is
+relevant for the research on local spin polarization. Based on this collisional
+term, we provide a formal discussion about first-order spin hydrodynamics and
+determine the motion equations of fluid variables and nonequilibrium
+corrections to the energy-momentum and spin tensors. The results indicate that
+the motion equations show no differences compared to spinless first-order
+hydrodynamics and the energy-momentum tensor receives no corrections from spin
+as far as first-order theory is concerned, which calls for the construction of
+second-order theory of fluids naturally incorporating the effect of spin-orbit
+coupling.",2111.03571v2
+2023-05-29,Higher-dimensional spin selectivity in chiral crystals,"This study aims to investigate the interplay between chiral-induced
+spin-orbit coupling along the screw axis and antisymmetric spin-orbit coupling
+(ASOC) in the normal plane within a chiral crystal, using both general model
+analysis and first-principles simulations of InSeI, a chiral van der Waals
+crystal. While chiral molecules of light atoms typically exhibit spin
+selectivity only along the screw axis, chiral crystals with heavier atoms can
+have strong ASOC effects that influence spin-momentum locking in all
+directions. The resulting phase diagram of spin texture shows the potential for
+controlling phase transition and flipping spin by reducing symmetry through
+surface cleavage, thickness reduction or strain. We also experimentally
+synthesized high-quality InSeI crystals of the thermodynamically stable achiral
+analogue which showed exposed (110) facets corresponding to single-handed
+helices to demonstrate the potential of material realization for
+higher-dimensional spin selectivity in the development of spintronic devices.",2305.18637v1
+2023-07-03,Spin model for the Honeycomb $\rm NiPS_3$,"In the Van der Waal material $\rm NiPS_3$, Ni atoms have spin S=1 and realize
+a honeycomb lattice. Six sulfur atoms surround each Ni and split their d
+manifold into three filled and two unfilled bands. Aimed to determine the spin
+Hamiltonian of $\rm NiPS_3$, we study its exchange mechanisms using a two-band
+half-filled Hubbard model. Hopping between d orbitals is mediated by p orbitals
+of sulfur and gives rise to bilinear and biquadratic spin couplings in the
+limit of strong electronic correlations. The microscopic model exposed a
+ferromagnetic biquadratic spin interaction $\rm K_1$ allowing the completion of
+a minimal $\rm J_1-J_3-K_1$ spin Hamiltonian for $\rm NiPS_3$. In bulk, a
+ferromagnetic first nearest neighbor $\rm J_1$ and a more significant
+antiferromagnetic third nearest neighbor spin coupling $\rm J_3$ agreed with
+the literature, while in monolayer $\rm J_1$ is positive and very small in
+comparison. Using a variational scheme we found that a zig-zag
+antiferromagnetic order is the ground state of bulk samples. The zig-zag
+pattern is adjacent to commensurate and incommensurate spin spirals, which
+could hint at the puzzling results reported in $\rm NiPS_3$ monolayers.",2307.01133v2
+2018-02-21,Quantum field theory of nematic transitions in spin orbit coupled spin-1 polar bosons,"We theoretically study an ultra-cold gas of spin-1 polar bosons in a one
+dimensional continuum which are subject to linear and quadratic Zeeman fields
+and a Raman induced spin-orbit coupling. Concentrating on the regime in which
+the background fields can be treated perturbatively we analytically solve the
+model in its low-energy sector, i.e. we characterize the relevant phases and
+the quantum phase transitions between them. Depending on the sign of the
+effective quadratic Zeeman field $\epsilon$, two superfluid phases with
+distinct nematic order appear. In addition, we uncover a spin-disordered
+superfluid phase at strong coupling. We employ a combination of renormalization
+group calculations and duality transformations to access the nature of the
+phase transitions. At $\epsilon = 0$, a line of spin-charge separated pairs of
+Luttinger liquids divides the two nematic phases and the transition to the spin
+disordered state at strong coupling is of the Berezinskii-Kosterlitz-Thouless
+type. In contrast, at $\epsilon \neq 0$, the quantum critical theory separating
+nematic and strong coupling spin disordered phases contains a Luttinger liquid
+in the charge sector that is coupled to a Majorana fermion in the spin sector
+(i.e. the critical theory at finite $\epsilon$ maps to a quantum critical Ising
+model that is coupled to the charge Luttinger liquid). Due to an emergent
+Lorentz symmetry, both have the same, logarithmically diverging velocity. We
+discuss the experimental signatures of our findings that are relevant to
+ongoing experiments in ultra-cold atomic gases of $^{23}$Na.",1802.07736v2
+2002-06-19,Magnetic-field dependence of energy levels in ultrasmall metal grains,"We present a theory of mesoscopic fluctuations of g tensors and avoided
+crossing energies in a small metal grain. The model, based on random matrix
+theory, contains both the orbital and spin contributions to the g tensor. The
+two contributions can be experimentally separated for weak spin-orbit coupling
+while they merge in the strong coupling limit. For intermediate coupling,
+substantial correlations are found between g factors of neighboring levels.",0206377v1
+2006-05-13,Scattering wave function approach to multi-terminal mesoscopic system with spin-orbit coupling,"In this paper,we present a detailed formulation to solve the scattering wave
+function for a multi-terminal mesoscopic system with spin-orbit coupling. In
+addition to terminal currents, all local quantities can be calculated
+explicitly by taking proper ensemble average in the Landauer-Buttiker's spirit
+using the scattering wave functions. Based on this formulation, we derive some
+rigorous results for equilibrium state. Furthermore, some new symmetry
+relations are found for the typical two terminal structure in which a
+semiconductor bar with Rashba or/and Dresselhaus SO coupling is sandwiched
+symmetrically between two leads. These symmetry property can provide accuracy
+tests for experimental measurements and numerical calculations.",0605361v1
+2011-03-15,Quantum transport in oxide nanostructures,"We describe magnetotransport experiments performed on Hall crosses made from
+quantum wires at LaAlO3/SrTiO3 interfaces. Shubnikov-de Haas oscillations
+measured in a 14-nm wide structure exhibit modulations that are consistent with
+spin-orbit coupling or valley degeneracies. Hall measurements performed on the
+6 nm-wide Hall cross reveal dissipative coupling to magnetic phases. Hall
+plateaus are observed that deviate significantly from two-dimensional quantum
+Hall counterparts. Non-monotonic dips in the Hall resistance are attributed to
+one-dimensional confinement and spin-orbit coupling.",1103.3036v1
+2014-10-17,Quantum plateau of Andreev reflection induced by spin-orbit coupling,"In this work we uncover an interesting quantum plateau behavior for the
+Andreev reflection between a one-dimensional quantum wire and superconductor.
+The quantum plateau is achieved by properly tuning the interplay of the
+spin-orbit coupling within the quantum wire and its tunnel coupling to the
+superconductor. This plateau behavior is justified to be unique by excluding
+possible existences in the cases associated with multi-channel quantum wire,
+the Blonder-Tinkham-Klapwijk continuous model with a barrier, and lattice
+system with on-site impurity at the interface.",1410.4642v1
+2015-04-22,Novel energy level structure of Dirac oscillator in magnetic field,"We have presented an elegant high energy quantum problem, namely, the full
+Dirac oscillator under axial magnetic field with its full solution. We have
+found the energy spectrum which is rich and at the same time has a novel
+structure. The quantized energy levels show coupling of the oscillator
+frequency with the Larmor frequency in the 2D surface where the electrons under
+consideration follow a 2D oscillator. The axis in which magnetic field is
+pointed, the electrons follow a 1D oscillator. There is also coupling between
+spin and orbital motion and also a coupling between a resultant effect of
+orbital and spin motion with Larmor precession.",1504.05660v2
+2015-06-19,Coherent manipulation of a Majorana qubit by a mechanical resonator,"We propose a hybrid system composed of a Majorana qubit and a nanomechanical
+resonator, implemented by a spin-orbit-coupled superconducting nanowire, using
+a set of static and oscillating ferromagnetic gates. The ferromagnetic gates
+induce Majorana bound states in the nanowire, which hybridize and constitute a
+Majorana qubit. Due to the oscillation of one of these gates, the Majorana
+qubit can be coherently rotated. By tuning the gate voltage to modulate the
+local spin-orbit coupling, it is possible to reach the resonance of the
+qubit-oscillator system for relatively strong couplings.",1506.05879v2
+2015-09-24,Fractional Local Moment and High Temperature Kondo Effect in Rashba-Fermi Gases,"We investigate the new physics that arises when a correlated quantum impurity
+hybridizes with Fermi gas with a generalized Rashba spin-orbit coupling
+produced via a uniform synthetic non-Abelian gauge field. We show that the
+impurity develops a {\it fractional} local moment which couples
+anti-ferromagnetically to the Rashba-Fermi gas. This results in a concomitant
+{\it Kondo effect with a high temperature scale} that can be tuned by the
+strength of the Rashba spin-orbit coupling.",1509.07328v2
+2016-04-01,Unconventional low-field magnetic response of a diffusive ring with spin-orbit coupling,"We report an unconventional behavior of electron transport in the limit of
+zero magnetic flux in a one-dimensional disordered ring, be it completely
+random or any correlated one, subjected to Rashba spin-orbit (SO) coupling. It
+exhibits much higher circulating current compared to a fully perfect ring for a
+wide range of SO coupling yielding larger electrical conductivity which is
+clearly verified from our Drude weight analysis.",1604.00165v2
+2018-02-19,Spin-Orbit Coupling Induced Resonance in an Ultracold Bose Gas,"We study a two-component Bose gas with artificial spin-orbit coupling (SOC)
+which couples the center-of-mass momentum of atom to its internal states. We
+show that in this system resonance can be induced by tuning SOC strength. With
+a two-dimensional SOC, resonances in two scattering channels can be induced by
+tuning the aspect ratio of SOC strengths. With a three-dimensional SOC,
+resonance in all scattering channels can be induced by tuning the appropriate
+SOC strength. Similarly, we also find that in a Fermi gas with two- or
+three-dimensional SOC resonance can be induced by tuning SOC strength.",1802.06522v2
+2018-11-13,Quench Dynamics in a Trapped Bose-Einstein Condensate with Spin-Orbit Coupling,"We consider the phase transition dynamics of a trapped Bose-Einstein
+condensate subject to Raman-type spin-orbit coupling (SOC). By tuning the
+coupling strength the condensate is taken through a second order phase
+transition into an immiscible phase. We observe the domain wall defects
+produced by a finite speed quench is described by the Kibble-Zurek mechanism
+(KZM), and quantify a power law behavior for the scaling of domain number and
+formation time with the quench speed.",1811.05327v2
+2014-03-14,Mott-Superfluid Transition for Spin-Orbit Coupled Bosons in One-Dimensional Optical Lattices,"We study the effects of spin-orbit coupling on the Mott-superfluid transition
+of bosons in a one-dimensional optical lattice. We determine the strong
+coupling magnetic phase diagram by a combination of exact analytic and
+numerical means. Smooth evolution of the magnetic structure into the superfluid
+phases are investigated with the density matrix renormalization group
+technique. Novel magnetic phases are uncovered and phase transitions between
+them within the superfluid regime are discussed. Possible experimental
+detection are discussed.",1403.3491v2
+2012-04-04,Intrinsic instability of electronic interfaces with strong Rashba coupling,"We consider a model for the two-dimensional electron gas formed at the
+interface of oxide heterostructures, which includes a Rashba spin-orbit
+coupling proportional to the electric field perpendicular to the interface.
+Based on the standard mechanism of polarity catastrophe, we assume that the
+electric field is proportional to the electron density. Under these simple and
+general assumptions, we show that a phase separation instability occurs for
+realistic values of the spin-orbit coupling and of the band parameters. This
+could provide an intrinsic mechanism for the recently observed inhomogeneous
+phases at the LaAlO_3/SrTiO_3 or LaTiO_3/SrTiO_3 interfaces.",1204.0962v3
+2013-09-17,Cavity-Assisted Dynamical Spin-Orbit Coupling in Cold Atoms,"We consider ultracold atoms subjected to a cavity-assisted two-photon Raman
+transition. The Raman coupling gives rise to effective spin-orbit interaction
+which couples atom's center-of-mass motion to its pseudospin degrees of
+freedom. Meanwhile, the cavity photon is dynamically affected by the atom. This
+feedback between atom and photon leads to a dramatic modification of the atomic
+dispersion relation, and further leads to dynamical instability of the system.
+We propose to detect the change of cavity photon number as a direct way to
+demonstrate dynamical instability.",1309.4369v2
+2020-10-30,Microscopic Theory of Ultrafast Skyrmion Excitation by Light,"We propose a microscopic mechanism for ultrafast skyrmion photo-excitation
+via a two-orbital electronic model. In the strong correlation limit the
+$d$-electrons are described by an effective spin Hamiltonian, coupled to
+itinerant $s$-electrons via $s-d$ exchange. Laser-exciting the system by a
+direct coupling to the electric charge leads to skyrmion nucleation on a 100 fs
+timescale. The coupling between photo-induced electronic currents and magnetic
+moments, mediated via Rashba spin-orbit interactions, is identified as the
+microscopic mechanism behind the ultrafast optical skyrmion excitation.",2010.16125v1
+2023-01-23,"Charge localization, frustration relief, and spin-orbit coupling in U$_3$O$_8$","Research efforts on the low temperature magnetic order and electronic
+properties of U$_3$O$_8$ have been inconclusive so far. Reinterpreting neutron
+scattering results, we use group representation theory to show that the ground
+state presents collinear out-of-plane magnetic moments, with antiferromagnetic
+coupling both in-layer and between layers. Charge localization relieves the
+initial geometric frustration, generating a slightly distorted honeycomb
+sublattice with N\'eel order. We show, furthermore, that spin-orbit coupling
+has a giant effect on the conduction band states and band gap value. Our
+results allow a reinterpretation of recent optical absorption measurements.",2301.09343v1
+2023-07-01,Coupling of acoustic phonon to a spin-orbit entangled pseudospin,"We consider coupling of acoustic phonon to pseudospins consisting of
+electronic spins locked to orbital angular momentum states. We show that a
+Berry phase term arises from projection onto the time-dependent lowest energy
+manifold. We examine consequences on the phonon modes, in particular mode
+splitting, induced chirality and Berry curvatures under an external magnetic
+field which Zeeman couples to the pseudospin.",2307.00208v2
+1997-05-07,Spin Precession and Time-Reversal Symmetry Breaking in Quantum Transport of Electrons Through Mesoscopic Rings,"We consider the motion of electrons through a mesoscopic ring in the presence
+of spin-orbit interaction, Zeeman coupling, and magnetic flux. The coupling
+between the spin and the orbital degrees of freedom results in the geometric
+and the dynamical phases associated with a cyclic evolution of spin state.
+Using a non-adiabatic Aharonov-Anandan phase approach, we obtain the exact
+solution of the system and identify the geometric and the dynamical phases for
+the energy eigenstates. Spin precession of electrons encircling the ring can
+lead to various interference phenomena such as oscillating persistent current
+and conductance. We investigate the transport properties of the ring connected
+to current leads to explore the roles of the time-reversal symmetry and its
+breaking therein with the spin degree of freedom being fully taken into
+account. We derive an exact expression for the transmission probability through
+the ring. We point out that the time-reversal symmetry breaking due to Zeeman
+coupling can totally invalidate the picture that spin precession results in
+effective, spin-dependent Aharonov-Bohm flux for interfering electrons.
+Actually, such a picture is only valid in the Aharonov-Casher effect induced by
+spin-orbit interaction only. Unfortunately, this point has not been realized in
+prior works on the transmission probability in the presence of both SO
+interaction and Zeeman coupling. We carry out numerical computation to
+illustrate the joint effects of spin-orbit interaction, Zeeman coupling and
+magnetic flux. By examining the resonant tunneling of electrons in the weak
+coupling limit, we establish a connection between the observable time-reversal
+symmetry breaking effects manifested by the persistent current and by the
+transmission probability. For a ring formed by two-dimensional electron gas, we",9705054v1
+2005-08-22,Edge spin accumulation in semiconductor two-dimensional hole gases,"The controlled generation of localized spin densities is a key enabler of
+semiconductor spintronics In this work, we study spin Hall effect induced edge
+spin accumulation in a two-dimensional hole gas with strong spin orbit
+interactions. We argue that it is an intrinsic property, in the sense that it
+is independent of the strength of disorder scattering. We show numerically that
+the spin polarization near the edge induced by this mechanism can be large, and
+that it becomes larger and more strongly localized as the spin-orbit coupling
+strength increases, and is independent of the width of the conducting strip
+once this exceeds the elastic scattering mean-free-path. Our experiments in
+two-dimensional hole gas microdevices confirm this remarkable spin Hall effect
+phenomenology. Achieving comparable levels of spin polarization by external
+magnetic fields would require laboratory equipment whose physical dimensions
+and operating electrical currents are million times larger than those of our
+spin Hall effect devices.",0508532v2
+2023-04-15,Unlocking Hidden Spins in Centrosymmetric SnSe2 by Vacancy-Controlled Spin-Orbit Scattering,"Spin current generation and manipulation remain the key challenge of
+spintronics, in which relativistic spinorbit coupling (SOC) play a ubiquitous
+role. In this letter, we demonstrate that hidden Rashba spins in the
+non-magnetic, centrosymmetric lattice of multilayer SnSe2 can be efficiently
+activated by spin-orbit scattering introduced by Se vacancies. Via vacancy
+scattering, conduction electrons with hidden spin-momentum locked polarizations
+acquire out-of-plane magnetization components, which effectively break the
+chiral symmetry between the two Se sublattices of an SnSe2 monolayer when
+electron spins start precession in the strong built-in Rashba SOC field. The
+resulting spin separations are manifested in quantum transport as vacancy
+concentrationand temperature-dependent crossovers from weak antilocalization
+(WAL) to weak localization (WL), with the distinctive spin relaxation mechanism
+of the Dyakonov-Perel type. Our study shows the great potential of
+twodimensional systems with hidden-spin textures for spintronics.",2304.07448v1
+2004-05-11,Spin relaxation dynamics of quasiclassical electrons in ballistic quantum dots with strong spin-orbit coupling,"We performed path integral simulations of spin evolution controlled by the
+Rashba spin-orbit interaction in the semiclassical regime for chaotic and
+regular quantum dots. The spin polarization dynamics have been found to be
+strikingly different from the D'yakonov-Perel' (DP) spin relaxation in bulk
+systems. Also an important distinction have been found between long time spin
+evolutions in classically chaotic and regular systems. In the former case the
+spin polarization relaxes to zero within relaxation time much larger than the
+DP relaxation, while in the latter case it evolves to a time independent
+residual value. The quantum mechanical analysis of the spin evolution based on
+the exact solution of the Schroedinger equation with Rashba SOI has confirmed
+the results of the classical simulations for the circular dot, which is
+expected to be valid in general regular systems. In contrast, the spin
+relaxation down to zero in chaotic dots contradicts to what have to be expected
+from quantum mechanics. This signals on importance at long time of the
+mesoscopic echo effect missed in the semiclassical simulations.",0405212v1
+2006-05-31,Persistent spin current in a spin-orbit coupling/normal hybrid ring,"We investigate the equilibrium property of a mesoscopic ring with spin orbit
+(SO) interaction. It is well known that for a normal mesoscopic ring threaded
+by a magnetic flux, the electron acquires a Berry phase that induces the
+persistent (charge) current. Similarly, the spin of electron acquires a spin
+Berry phase traversing the ring with SO interaction. It is this spin Berry
+phase that induces a persistent spin current. To demonstrate its existence, we
+calculate the persistent spin current without accompanying charge current in
+the normal region in a hybrid mesoscopic ring. We point out that this
+persistent spin current describes the real spin motion and can be observed
+experimentally.",0605748v1
+2010-05-21,Spin injection and perpendicular spin transport in graphite nanostructures,"Organic and carbon-based materials are attractive for spintronics because
+their small spin-orbit coupling and low hyperfine interaction is expected to
+give rise to large spin-relaxation times. However, the corresponding
+spin-relaxation length is not necessarily large when transport is via weakly
+interacting molecular orbitals. Here we use graphite as a model system and
+study spin transport in the direction perpendicular to the weakly bonded
+graphene sheets. We achieve injection of highly (75%) spin-polarized electrons
+into graphite nanostructures of 300-500 nm across and up to 17 nm thick, and
+observe transport without any measurable loss of spin information. Direct
+visualization of local spin transport in graphite-based spin-valve sandwiches
+also shows spatially uniform and near-unity transmission for electrons at 1.8
+eV above the Fermi level.",1005.3991v1
+2021-05-07,Optical induced Spin Current in Monolayer NbSe$_2$,"Monolayer NbSe2 is a metallic two-dimensional (2D) transition-metal
+dichalcogenide material. Owing to the lattice structure and the strong atomic
+spin-orbit coupling (SOC) field, monolayer NbSe2 possesses Ising-type SOC which
+acts as effective Zeeman field, leading to the unconventional topological spin
+properties. In this paper, we numerically calculate spin-dependent optical
+conductivity of monolayer NbSe2 using Kubo formula based on an effective
+tight-binding model which includes $d_{z^2}$, $d_{x^2-y^2}$ and $d_{xy}$
+orbitals of Nb atom. Numerical calculation indicates that the up- and down-spin
+have opposite sign of Hall current, so the pure spin Hall current can be
+generated in monolayer NbSe2 under light irradiation, owing to the topological
+nature of monolayer NbSe2, i.e., finite spin Berry curvature. The spin Hall
+angle is also evaluated. The optical induced spin Hall current can be enhanced
+by the electron doping and persists even at room temperature. Our results will
+serve to design opt-spintronics devices such as spin current harvesting by
+light irradiation on the basis of 2D materials.",2105.03021v1
+2023-10-20,Exchange-driven spin Hall effect in anisotropic ferromagnets,"Crystallographic anisotropy of the spin-dependent conductivity tensor can be
+exploited to generate transverse spin-polarized current in a ferromagnetic
+film. This ferromagnetic spin Hall effect is analogous to the spin-splitting
+effect in altermagnets and does not require spin-orbit coupling.
+First-principles screening of 41 non-cubic ferromagnets revealed that many of
+them, when grown as a single crystal with tilted crystallographic axes, can
+exhibit large spin Hall angles comparable with the best available
+spin-orbit-driven spin Hall sources. Macroscopic spin Hall effect is possible
+for uniformly magnetized ferromagnetic films grown on some low-symmetry
+substrates with epitaxial relations that prevent cancellation of contributions
+from different orientation domains. Macroscopic response is also possible for
+any substrate if magnetocrystalline anisotropy is strong enough to lock the
+magnetization to the crystallographic axes in different orientation domains.",2310.13688v2
+2015-04-20,Three-component Fulde-Ferrell superfluids in a two-dimensional Fermi gas with spin-orbit coupling,"We investigate the pairing physics of a three-component spin-orbit coupled
+Fermi gas in two spatial dimensions. The three atomic hyperfine states of the
+system are coupled by the recently realized synthetic spin-orbit coupling
+(SOC), which mixes different hyperfine states into helicity branches in a
+momentum-dependent manner. As a consequence, the interplay of spin-orbit
+coupling and the hyperfine-state dependent interactions leads to the emergence
+of Fulde-Ferrell (FF) pairing states with finite center-of-mass momenta even in
+the absence of the Fermi-surface asymmetry that is usually mandatory to
+stabilize an SOC-induced FF state. We show that, for different combinations of
+spin-dependent interactions, the ground state of the system can either be the
+conventional Bardeen-Cooper-Schrieffer pairing state with zero center-of-mass
+momentum or be the FF pairing states. Of particular interest here is the
+existence of a three-component FF pairing state in which every two out of the
+three components form FF pairing. We map out the phase diagram of the system
+and characterize the properties of the three-component FF state, such as the
+order parameters, the gapless contours and the momentum distributions. Based on
+these results, we discuss possible experimental detection schemes for the
+interesting pairing states in the system.",1504.05047v2
+2015-11-22,Review of Spin Orbit Coupled Semimetal SrIrO3 in thin film form,"Spin orbit coupling provides a mechanism to lock the momentum of electron to
+its spin degree, recent years was revealed to be essential in arousing many
+novel physical behaviors. SrIrO3 is a typical metallic member of the strong
+spin orbit coupling iridate family. Its orthorhombic phase was confirmed as a
+particular spin orbit coupling assistant electron correlated semimetal with
+small electron and hole pockets, and was supposed to host versatile topological
+phases, with prospect of opening a new topological matter field based on
+oxides. The existing experiments have demonstrated that orthorhombic SrIrO3 can
+be easily synthesized at two dimensional scale films under the substrate
+lattice constraint, and the films display Fermi-liquid behavior in high
+temperature and generally two dimensional weak localization resulted metal
+insulator transition. The properties of orthorhombic SrIrO3 film are sensitive
+to the rotation and tilting angle, as well as the interlayer coupling of the
+IrO6 octahedras, consequently can be tuned through substrate strain engineering
+and size scale. For example, the film was approached a state similar to Sr2IrO4
+at the ultrathin limit to several unit cell, becoming a canted
+antiferromagnetic semiconductor/insulator. The existing knowledges suggest
+urgent demands of researches on the superlattices constructed with orthorhombic
+SrIrO3, for further understanding the evolution mechanism of the electron
+structure, and so the relevant magnetic state and topological phases in the
+orthorhombic SrIrO3 and its family.",1511.06979v2
+2018-09-05,Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains,"We consider a system of generalized coupled Discrete Nonlinear
+Schr\""{o}dinger (DNLS) equations, derived as a tight-binding model from the
+Gross-Pitaevskii-type equations describing a zigzag chain of weakly coupled
+condensates of exciton-polaritons with spin-orbit (TE-TM) coupling. We focus on
+the simplest case when the angles for the links in the zigzag chain are $\pm
+\pi/4$ with respect to the chain axis, and the basis (Wannier) functions are
+cylindrically symmetric (zero orbital angular momenta). We analyze the
+properties of the fundamental nonlinear localized solutions, with particular
+interest in the discrete gap solitons appearing due to the simultaneous
+presence of spin-orbit coupling and zigzag geometry, opening a gap in the
+linear dispersion relation. In particular, their linear stability is analyzed.
+We also find that the linear dispersion relation becomes exactly flat at
+particular parameter values, and obtain corresponding compact solutions
+localized on two neighboring sites, with spin-up and spin-down parts $\pi/2$
+out of phase at each site. The continuation of these compact modes into
+exponentially decaying gap modes for generic parameter values is studied
+numerically, and regions of stability are found to exist in the lower or upper
+half of the gap, depending on the type of gap modes.",1809.01623v2
+2016-09-30,Spin-orbit coupling in a hexagonal ring of pendula,"We consider the mechanical motion of a system of six macroscopic pendula
+which are connected with springs and arranged in a hexagonal geometry. When the
+springs are pre-tensioned, the coupling between neighbouring pendula along the
+longitudinal (L) and the transverse (T) directions are different: identifying
+the motion along the L and T directions as a spin-like degree of freedom, we
+theoretically and experimentally verify that the pre-tensioned springs result
+in a tunable spin-orbit coupling. We elucidate the structure of such a
+spin-orbit coupling in the extended two-dimensional honeycomb lattice, making
+connections to physics of graphene. The experimental frequencies and the
+oscillation patterns of the eigenmodes for the hexagonal ring of pendula are
+extracted from a spectral analysis of the motion of the pendula in response to
+an external excitation and are found to be in good agreement with our
+theoretical predictions. We anticipate that extending this classical analogue
+of quantum mechanical spin-orbit coupling to two-dimensional lattices will lead
+to exciting new topological phenomena in classical mechanics.",1609.09651v2
+2019-11-29,Observation of the spin-orbit gap in bilayer graphene by one-dimensional ballistic transport,"We report on measurements of quantized conductance in gate-defined quantum
+point contacts in bilayer graphene that allow the observation of subband
+splittings due to spin-orbit coupling. The size of this splitting can be tuned
+from 40 to 80 $\mu$eV by the displacement field. We assign this gate-tunable
+subband-splitting to a gap induced by spin-orbit coupling of Kane-Mele type,
+enhanced by proximity effects due to the substrate. We show that this
+spin-orbit coupling gives rise to a complex pattern in low perpendicular
+magnetic fields, increasing the Zeeman splitting in one valley and suppressing
+it in the other one. In addition, we observe the existence of a spin-polarized
+channel of 6 e$^2$/h at high in-plane magnetic field and of signatures of
+interaction effects at the crossings of spin-split subbands of opposite spins
+at finite magnetic field.",1911.13176v4
+2022-10-17,Experimental observation of spin-split energy dispersion in high-mobility single-layer graphene/WSe2 heterostructures,"Proximity-induced spin-orbit coupling in graphene has led to the observation
+of intriguing phenomena like time-reversal invariant $\mathbb{Z}_2$ topological
+phase and spin-orbital filtering effects. An understanding of the effect of
+spin-orbit coupling on the band structure of graphene is essential if these
+exciting observations are to be transformed into real-world applications. In
+this research article, we report the experimental determination of the band
+structure of single-layer graphene (SLG) in the presence of strong
+proximity-induced spin-orbit coupling. We achieve this in high-mobility
+hBN-encapsulated SLG/WSe2 heterostructures through measurements of quantum
+oscillations. We observe clear spin-splitting of the graphene bands along with
+a substantial increase in the Fermi velocity. Using a theoretical model with
+realistic parameters to fit our experimental data, we uncover evidence of a
+band gap opening and band inversion in the SLG. Further, we establish that the
+deviation of the low-energy band structure from pristine SLG is determined
+primarily by the valley-Zeeman SOC and Rashba SOC, with the Kane-Mele SOC being
+inconsequential. Despite robust theoretical predictions and observations of
+band-splitting, a quantitative measure of the spin-splitting of the valence and
+the conduction bands and the consequent low-energy dispersion relation in SLG
+was missing -- our combined experimental and theoretical study fills this
+lacuna.",2210.08926v1
+2021-08-14,Dissipation-relaxation dynamics of a spin-1/2 particle with a Rashba-type spin-orbit coupling in an ohmic heat bath,"Spin-orbit coupling (SOC), which is inherent to a Dirac particle that moves
+under the influence of electromagnetic fields, manifests itself in a variety of
+physical systems including non-relativistic ones. For instance, it plays an
+essential role in spintronics developed in the past few decades, particularly
+by controlling spin current generation and relaxation. In the present work, by
+using an extended Caldeira-Leggett model, we elucidate how the interplay
+between spin relaxation and momentum dissipation of an open system of a single
+spin-$1/2$ particle with a Rashba type SOC is induced by the interactions with
+a spinless, three-dimensional environment. Staring from the path integral
+formulation for the reduced density matrix of the system, we have derived a set
+of coupled nonlinear equations that consists of a quasi-classical Langevin
+equation for the momentum with a frictional term and a spin precession
+equation. The spin precesses around the effective magnetic field generated by
+both the SOC and the frictional term. It is found from analytical and numerical
+solutions to these equations that a spin torque effect included in the
+effective magnetic field causes a spin relaxation and that the spin and
+momentum orientations after a long time evolution are largely controlled by the
+Rashba coupling strength. Such a spin relaxation mechanism is qualitatively
+different from, e.g., the one encountered in semiconductors where essentially
+no momentum dissipation occurs due to the Pauli blocking.",2108.06465v1
+2006-12-31,Local spin density in two-dimensional electron gas with hexagonal boundary,"The intrinsic spin-Hall effect in hexagon-shaped samples is investigated. To
+take into account the spin-orbit couplings and to fit the hexagon edges, we
+derive the triangular version of the tight-binding model for the linear Rashba
+[Sov. Phys. Solid State 2, 1109 (1960)] and Dresselhaus [Phys. Rev. 100, 580
+(1955)] [001] Hamiltonians, which allow direct application of the
+Landauer-Keldysh non-equilibrium Green function formalism to calculating the
+local spin density within the hexagonal sample. Focusing on the out-of-plane
+component of spin, we obtain the geometry-dependent spin-Hall accumulation
+patterns, which are sensitive to not only the sample size, the spin-orbit
+coupling strength, the bias strength, but also the lead configurations.
+Contrary to the rectangular samples, the accumulation pattern can be very
+different in our hexagonal samples. Our present work provides a fundamental
+description of the geometry effect on the intrinsic spin-Hall effect, taking
+the hexagon as the specific case. Moreover, broken spin-Hall symmetry due to
+the coexistence of the Rashba and Dresselhaus couplings is also discussed. Upon
+exchanging the two coupling strengths, the accumulation pattern is reversed,
+confirming the earlier predicted sign change in spin-Hall conductivity.",0701019v2
+2017-07-23,Topological spinon bands and vison excitations in spin-orbit coupled quantum spin liquids,"Spin liquids are exotic quantum states characterized by the existence of
+fractional and deconfined quasiparticle excitations, referred to as spinons and
+visons. Their fractional nature establishes topological properties such as a
+protected ground-state degeneracy. This work investigates spin-orbit coupled
+spin liquids where, additionally, topology enters via non-trivial band
+structures of the spinons. We revisit the $Z_2$ spin-liquid phases that have
+recently been identified in a projective symmetry-group analysis on the square
+lattice when spin-rotation symmetry is maximally lifted [Phys. Rev. B 90,
+174417 (2014)]. We find that in the case of nearest neighbor couplings only,
+$Z_2$ spin liquids on the square lattice always exhibit trivial spinon bands.
+Adding second neighbor terms, the simplest projective symmetry-group solution
+closely resembles the Bernevig-Hughes-Zhang model for topological insulators.
+Assuming that the emergent gauge fields are static we investigate vison
+excitations, which we confirm to be deconfined in all investigated spin phases.
+Particularly, if the spinon bands are topological, the spinons and visons form
+bound states consisting of several spinon-Majorana zero modes coupling to one
+vison. The existence of such zero modes follows from an exact mapping between
+these spin phases and topological $p+ip$ superconductors with vortices. We
+propose experimental probes to detect such states in real materials.",1707.07306v1
+2016-07-09,Electrical spin injection into graphene from a topological insulator in a van der Waals heterostructure,"All-electrical (magnetic-material-free) spin injection is one of the
+outstanding goals in spintronics. Topological insulators (TIs) have been
+recognized as a promising electrically controlled spin source thanks to the
+strong spin-orbit coupling and in particular, the spin-momentum locked
+topological surface states (TSS) supporting helically spin polarized currents.
+Many TI materials such as Bi-based chalcogenides are also layered 2D materials
+and can be incorporated into van der Waals (vdW) coupled heterostructures,
+opening the possibility of the utilization of TIs for electrical spin injection
+into other 2D materials. Here, we demonstrate electrical injection of helically
+spin-polarized current into graphene through a 3D TI in a mechanically stacked
+heterostructure between Bi2Te2Se (a TI) and chemical vapor deposition
+(CVD)-grown graphene, using the spin potentiometric measurement. When a dc
+current is flowing from the TI to graphene, we detect a striking step-like
+voltage change (spin signal) in both the TI and graphene using ferromagnetic
+(FM) probes. The sign of the spin signal can be reversed by reversing the
+direction of the dc bias current, and the corresponding amplitude of the spin
+signal increases linearly with the bias current, indicative of a
+current-induced helical spin polarization in both TI and graphene. In contrast,
+the graphene itself exhibits usual nonlocal spin valve signal when the spins
+are injected using an FM electrode. We discuss possible origins of the helical
+spin polarization injected into the graphene in our TI/graphene heterostructure
+that may include TSS as well as the spin-orbit coupled Rashba states. Our
+findings show electrical injection of a spin helical current into graphene
+through a TI and demonstrate TIs as potential spin sources for future
+spintronic devices wherein spin manipulation is achieved electrically.",1607.02651v1
+2002-05-19,Adiabatic spin pumping through a quantum dot with a single orbital level,"We investigate an adiabatic spin pumping through a quantum dot with a single
+orbital energy level under the Zeeman effect. Electron pumping is produced by
+two periodic time dependent parameters, a magnetic field and a difference of
+the dot-lead coupling between the left and right barriers of the dot. The
+maximum charge transfer per cycle is found to be $e$, the unit charge in the
+absence of a localized moment in the dot. Pumped charge and spin are different,
+and spin pumping is possible without charge pumping in a certain situation.
+They are tunable by changing the minimum and maximum value of the magnetic
+field.",0205395v2
+2003-06-02,Comments on `Rashba precession in quantum wire with interaction',"In a recent Rapid Communication (Phys. Rev. B {\bf 63}, 121210(R) (2001)),
+Ha\""usler showed that the interaction between electrons in quantum wires may
+enhance the persistent spin current arising from Rashba spin-orbital coupling.
+In this Comments, we would like to point out that this 'enhancement' comes from
+a misunderstanding to the boosting persistent current in the Luttinger liquid
+theory. A correct calculation will not give such an enhancement of the
+persistent spin current. Meanwhile, we provide a Luttinger liquid theory with
+Rashba spin-orbital interaction by bosonization, which may show how the Rashba
+precession is in a Luttinger liquid.",0306019v1
+2005-10-04,Quantum splitter controlled by Rashba spin-orbit interaction,"We propose the mesoscopic device based on the Rashba spin orbit interaction
+(SOI) that contains a gated ballistic Aharonov-Bohm (AB) ring with incoming
+lead and two asymmetrically situated outgoing leads. The variations of the
+Rashba coupling parameter induced by the gate voltage applied to the AB ring is
+shown to cause the redistribution of the carrier flux between the outgoing
+leads and spin polarization of the outgoing currents, thus allowing the system
+to manifest the properties of the quantum splitter and spin filter.",0510069v1
+2006-09-05,Out-of-plane spin polarization from in-plane electric and magnetic fields,"We show that the joint effect of spin-orbit and magnetic fields leads to a
+spin polarization perpendicular to the plane of a two-dimensional electron
+system with Rashba spin-orbit coupling and in-plane parallel dc magnetic and
+electric fields, for angle-dependent impurity scattering or nonparabolic energy
+spectrum, while only in-plane polarization persists for simplified models. We
+derive Bloch equations, describing the main features of recent experiments,
+including the magnetic field dependence of static and dynamic responses.",0609078v1
+2011-08-15,Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals,"We study double-exchange models with itinerant t2g electrons in spinel and
+pyrochlore crystals. In both cases the localized spins form a network of
+corner-sharing tetrahedra. We show that the strong directional dependence of
+t2g orbitals leads to unusual Fermi surfaces that induce spin superstructures
+and noncoplanar orderings for a weak coupling between itinerant electrons and
+localized spins. Implications of our results to ZnV2O4 and Cd2Os2O7 are also
+discussed.",1108.3066v1
+2013-07-31,Relativistic symmetries in Rosen-Morse potential and tensor interaction using the Nikiforov-Uvarov method,"Approximate analytical bound-state solutions of the Dirac particle in the
+field of both attractive and repulsive RM potentials including Coulomb-like
+tensor (CLT) potential are obtained for arbitrary spin-orbit quantum number The
+Pekeris approximation is used to deal with the spin-orbit coupling terms In the
+presence of exact spin and pseudospin (p-spin) symmetries, the energy
+eigenvalues and the corresponding normalized two-component wave functions are
+found by using the parametric generalization of the Nikiforov-Uvarov (NU)
+method. The numerical results show that the CLT interaction removes
+degeneracies between spin and p-spin state doublets.",1307.8311v1
+2018-09-20,Highly Efficient Induction of Spin Polarization by Circularly-Polarized Electromagnetic Waves in the Rashba Spin-Orbit Systems,"We theoretically demonstrate that a rotating electric-field component of
+circularly polarized microwave or terahertz light can induce electron-spin
+polarization within a few picoseconds in a two-dimensional electron system with
+the Rashba spin-orbit interaction by taking advantage of the magnetoelectric
+coupling. The efficiency turns out to be several orders of magnitude greater
+than that of conventional methods, indicating high potential of this technique
+for future spintronics.",1809.07513v1
+2020-04-01,Entropy and specific heat of the infinite-dimensional three-orbital Hubbard model,"The Hund coupling in multiorbital Hubbard systems induces spin freezing and
+associated Hund metal behavior. Using dynamical mean field theory, we explore
+the effect of local moment formation, spin and charge excitations on the
+entropy and specific heat of the three-orbital model. In particular, we
+demonstrate a substantial enhancement of the entropy in the spin-frozen metal
+phase at low temperatures, and peaks in the specific heat associated with the
+activation of spin and charge fluctuations at high temperature. We also clarify
+how these temperature scales depend on the interaction parameters and filling.",2004.00471v1
+2010-02-01,Tunneling Anisotropic Magnetoresistance of Helimagnet Tunnel Junctions,"We theoretically investigate the angular and spin dependent transport in
+normal-metal/helical-multiferroic/ferromagnetic heterojunctions. We find a
+tunneling anisotropic magnetoresistance (TAMR) effect due to the spiral
+magnetic order in the tunnel junction and to an effective spin-orbit coupling
+induced by the topology of the localized magnetic moments in the multiferroic
+spacer.
+  The predicted TAMR effect is efficiently controllable by an external electric
+field due to the magnetoelectric coupling.",1002.0221v1
+2013-10-31,A Non-Centrosymmetric Superconductor with a Bulk 3D Dirac Cone Gapped by Strong Spin Orbit Coupling,"Layered, non-centrosymmetric, heavy element PbTaSe2 is found to be
+superconducting. We report its electronic properties accompanied by electronic
+structure calculations. Specific heat, electrical resistivity and magnetic
+susceptibility measurements indicate that PbTaSe2 is a moderately coupled,
+type-II BCS superconductor (Tc = 3.72 K, Ginzburg-Landau parameter Kappa = 14)
+with an electronphonon coupling constant of Lambda_ep = 0.74. Electronic
+structure calculations reveal a single bulk 3D Dirac cone at the K point of the
+Brillouin Zone derived exclusively from its hexagonal Pb layer; it is similar
+to the feature found in graphene except there is a 0.8 eV gap opened by
+spin-orbit coupling. The combination of large spin-orbit coupling and lack of
+inversion symmetry also results in large Rashba splitting on the order of
+tenths of eV.",1310.8368v1
+2015-09-14,Itinerant chiral ferromagnetism in a trapped Rashba spin-orbit coupled Fermi gas,"How ferromagnetic phases emerge in itinerant systems is an outstanding
+problem in quantum magnetism. Here we consider a repulsive two-component Fermi
+gas confined in a two dimensional isotropic harmonic potential and subject to a
+large Rashba spin-orbit (SO) coupling, whose single-particle dispersion can be
+tailored by adjusting the SO coupling strength. We show that the interplay
+among SO coupling, correlation effects and mean-field repulsion leads to a
+competition between ferromagnetic and non-magnetic phases. At intermediate
+interaction strengths, ferromagnetic phase emerges which can be well described
+by the mean-field Hartree-Fock theory; whereas at strong interaction strengths,
+a strongly correlated non-magnetic phase is favored due to the
+beyond-mean-field quantum correlation effects. Furthermore, the ferromagnetic
+phase of this system possesses a chiral current density induced by the Rashba
+spin-orbit coupling, whose experimental signature is investigated.",1509.04095v1
+2014-06-19,A criterion of the non-existence of surface states in a semi-infinite crystal,"An infinite crystal can be constructed by an infinite number of parallel
+two-dimensional (hkl) crystal planes coupled to each other. For crystals with
+negligible spin-orbit coupling, we report a rigorous proof of a criterion on
+the non-existence of surface states in a semi-infinite crystal with the crystal
+symmetry. The forward transfer to be the same as the backward one, called as
+F-B dynamical symmetry, is key to realize the criterion. Based on lattice model
+Hamiltonian with coupling between the nearest neighbor crystal planes only, we
+prove that a cut crystal will not be able to accommodate any surface states if
+the original infinite crystal has reflection symmetry about every crystal plane
+which results in F-B symmetry. The criterion provide a platform to simply
+conclude whether surface states exist or not in a cut crystal. For any such
+crystals, the non-existence or existence of surface states depends on the cut
+direction of the crystal plane. Since the spin-orbit coupling breaks the chiral
+symmetry, resulting in the F-B asymmetry, surface states can emerge in the
+(hkl) cut crystal with spin-orbit coupling.",1406.5010v2
+2018-06-18,From Klein to anti-Klein tunneling in graphene tuning the Rashba spin-orbit interaction or the bilayer coupling,"We calculate the transmission coefficient for a particle crossing a potential
+barrier in monolayer graphene with Rashba spin-orbit coupling and in bilayer
+graphene. We show that in both the cases one can go from Klein tunneling
+regime, characterized by perfect normal transmission, to anti-Klein tunneling
+regime, with perfect normal reflection, by tuning the Rashba spin-orbit
+coupling for a monolayer or the interplane coupling for a bilayer graphene. We
+show that the intermediate regime is characterized by a non-monotonic behavior
+with oscillations and resonances in the normal transmission amplitude as a
+function of the coupling and of the potential parameters.",1806.06962v2
+2019-03-20,High Landau levels of 2D electrons near the topological transition caused by interplay of spin-orbit and Zeeman energy shifts,"In the presence of spin-orbit coupling two branches of the energy spectrum of
+2D electrons get shifted in the momentum space. Application of in-plane
+magnetic field causes the splitting of the branches in energy. When both,
+spin-orbit coupling and Zeeman splitting are present, the branches of energy
+spectrum cross at certain energy. Near this energy, the Landau quantization
+becomes peculiar since semiclassical trajectories, corresponding to individual
+branches, get coupled. We study this coupling as a function of proximity to the
+topological transition. Remarkably, the dependence on the proximity is strongly
+asymmetric reflecting the specifics of the behavior of the trajectories near
+the crossing. Equally remarkable, on one side of the transition, the magnitude
+of coupling is an oscillating function of this proximity. These oscillations
+can be interpreted in terms of the St{\""u}ckelberg interference. Scaling of
+characteristic detuning with magnetic length is also unusual. This unusual
+behavior cannot be captured by simply linearizing the Fermi contours near the
+crossing point.",1903.08315v1
+2019-03-30,Disentangling spin-orbit coupling and local magnetism in a quasi-two-dimensional electron system,"Quantum interference between time-reversed electron paths in two dimensions
+leads to the well-known weak localization correction to resistance. If
+spin-orbit coupling is present, the resistance correction is negative, termed
+weak anti-localization (WAL). Here we report the observation of WAL coexisting
+with exchange coupling between itinerant electrons and localized magnetic
+moments. We use low-temperature magneto-transport measurements to investigate
+the quasi-two-dimensional, high-electron-density interface formed between
+SrTiO$_3$ (STO) and the anti-ferromagnetic Mott insulator NdTiO$_3$ (NTO). As
+the magnetic field angle is gradually tilted away from the sample normal, the
+data reveals the interplay between strong $k$-cubic Rashba-type spin-orbit
+coupling and a substantial magnetic exchange interaction from local magnetic
+regions. The resulting quantum corrections to the conduction are in excellent
+agreement with existing models and allow sensitive determination of the small
+magnetic moments (22 $\mu_B$ on average), their magnetic anisotropy and mutual
+coupling strength. This effect is expected to arise in other 2D magnetic
+materials systems.",1904.00295v2
+2023-07-14,Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling,"We study a two-dimensional (2D) electron system with a linear spectrum in the
+presence of Rashba spin-orbit (RSO) coupling in the hydrodynamic regime. We
+derive a semiclassical Boltzmann equation with a collision integral due to
+Coulomb interactions in the basis of the eigenstates of the system with RSO
+coupling. Using the local equilibrium distribution functions, we obtain a
+generalized hydrodynamic Navier-Stokes equation for electronic systems with RSO
+coupling. In particular, we discuss the influence of the spin-orbit coupling on
+the viscosity and the enthalpy of the system and present some of its observable
+effects in hydrodynamic transport.",2307.07408v3
+2024-01-31,Stability of vortices in exciton-polariton condensates with spin-orbital-angular-momentum coupling,"The existence and dynamics of stable quantized vortices is an important
+subject of quantum many-body physics. Spin-orbital-angular-momentum coupling
+(SOAMC), a special type of spin-orbit coupling, has been experimentally
+achieved to create vortices in atomic Bose-Einstein condensate (BEC). Here, we
+generalize the concept of SOAMC to a two-component polariton BEC and analyze
+the emergence and configuration of vortices under a finite-size circular
+pumping. We discover that the regular configuration of vortex lattices induced
+by a finite-size circular pump is significantly distorted by the spatially
+dependent Raman coupling of SOAMC. Meanwhile, a vortex induced by SOAMC located
+at the center of the polariton cloud remains stable and pinned in place. When
+the Raman coupling is sufficiently strong, the polariton BEC with SOAMC is torn
+apart to become fragmented.",2401.17927v1
+2011-10-21,Spin Relaxation in Ge/Si Core-Shell Nanowire Qubits,"Controlling decoherence is the most challenging task in realizing quantum
+information hardware. Single electron spins in gallium arsenide are a leading
+candidate among solid- state implementations, however strong coupling to
+nuclear spins in the substrate hinders this approach. To realize spin qubits in
+a nuclear-spin-free system, intensive studies based on group-IV semiconductor
+are being pursued. In this case, the challenge is primarily control of
+materials and interfaces, and device nanofabrication. We report important steps
+toward implementing spin qubits in a predominantly nuclear-spin-free system by
+demonstrating state preparation, pulsed gate control, and charge-sensing spin
+readout of confined hole spins in a one-dimensional Ge/Si nanowire. With fast
+gating, we measure T1 spin relaxation times in coupled quantum dots approaching
+1 ms, increasing with lower magnetic field, consistent with a spin-orbit
+mechanism that is usually masked by hyperfine contributions.",1110.4742v1
+2003-10-16,Spin Hall effect and Berry phase in two dimensional electron gas,"The spin Hall effect is investigated in a high mobility two dimensional
+electron system with the spin-orbital coupling of both the Rashba and the
+Dresselhaus types. A spin current perpendicular to the electric field is
+generated by either the Rashba or the Dresselhaus coupling. The spin Hall
+conductance is independent of the stength of the coupling, but its sign is
+determined by the relative ratio of the two couplings. The direction of spin
+current is controllable by tuning the magnitude of the surface electric field
+perpendicular to the two dimensional plane via adjusting the Rashba coupling.
+It is observed that the spin Hall conductance has a close relation to the Berry
+phase of conduction electrons.",0310368v3
+2009-07-09,Spin-lattice coupling in frustrated antiferromagnets,"We review the mechanism of spin-lattice coupling in relieving the geometrical
+frustration of pyrochlore antiferromagnets, in particular spinel oxides. The
+tetrahedral unit, which is the building block of the pyrochlore lattice,
+undergoes a spin-driven Jahn-Teller instability when lattice degrees of freedom
+are coupled to the antiferromagnetism. By restricting our considerations to
+distortions which preserve the translational symmetries of the lattice, we
+present a general theory of the collective spin-Jahn-Teller effect in the
+pyrochlore lattice. One of the predicted lattice distortions breaks the
+inversion symmetry and gives rise to a chiral pyrochlore lattice, in which
+frustrated bonds form helices with a definite handedness. The chirality is
+transferred to the spin system through spin-orbit coupling, resulting in a
+long-period spiral state, as observed in spinel CdCr2O4. We discuss explicit
+models of spin-lattice coupling using local phonon modes, and their
+applications in other frustrated magnets.",0907.1693v1
+2015-02-13,Antiferromagnet-Mediated Spin Transfer Between Metal and Ferromagnet,"We develop a theory for spin transported by coherent Neel dynamics through an
+antiferromagnetic insulator coupled to a ferromagnetic insulator on one side
+and a current-carrying normal metal with strong spin-orbit coupling on the
+other. The ferromagnet is considered within the mono-domain limit and we assume
+its coupling to the local antiferromagnet Neel order at the
+ferromagnet|antiferromagnet interface through exchange coupling. Coupling
+between the charge current and the local Neel order at the other interface is
+described using spin Hall phenomenology. Spin transport through the
+antiferromagnet, assumed to possess an easy-axis magnetic anisotropy, is solved
+within the adiabatic approximation and the effect of spin current flowing into
+the ferromagnet on its resonance linewidth is evaluated. Onsager reciprocity is
+used to evaluate the inverse spin Hall voltage generated across the metal by a
+dynamic ferromagnet as a function the antiferromagnet thickness.",1502.04128v1
+2015-02-28,Electron-spin to Phonon Coupling in Graphene Decorated with Heavy Adatoms,"The naturally weak spin-orbit coupling in Graphene can be largely enhanced by
+adatom deposition (e.g. Weeks et al. Phys. Rev. X 1, 021001 (2011)). However,
+the dynamics of the adatoms also induces a coupling between phonons and the
+electron spin. Using group theory and a tight-binding model, we systematically
+investigate the coupling between the low-energy in-plane phonons and the
+electron spin in single-layer graphene uniformly decorated with heavy adatoms.
+Our results provide the foundation for future investigations of spin transport
+and superconductivity in this system. In order to quantify the effect of the
+coupling to the lattice on the electronic spin dynamics, we compute the
+spin-flip rate of electrons and holes. We show that the latter exhibits a
+strong dependence on the quasi-particle energy and system temperature.",1503.00092v1
+2011-11-29,Accelerated Orbital Expansion And Secular Spin Down of the Accreting Millisecond Pulsar SAX J1808.4-3658,"The accreting millisecond pulsar SAX J1808.4-3658 has shown a peculiar
+orbital evolution in the past with an orbital expansion much faster than
+expected from standard binary evolutionary scenarios. Previous limits on the
+pulsar spin frequency derivative during transient accretion outbursts were
+smaller than predicted by standard magnetic accretion torque theory, while the
+spin evolution between outbursts was consistent with magnetic dipole spin-down.
+In this paper we present the results of a coherent timing analysis of the 2011
+outburst observed by the Rossi X-ray Timing Explorer and extend our previous
+long-term measurements of the orbital and spin evolution over a baseline of
+thirteen years. We find that the expansion of the 2 hr orbit is accelerating at
+a rate 1.6E-20 s/s^2 and we interpret this as the effect of short-term angular
+momentum exchange between the mass donor and the orbit. The gravitational
+quadrupole coupling due to variations in the oblateness of the companion can be
+a viable mechanism for explaining the observations. No significant spin
+frequency derivatives are detected during the 2011 outburst (<4E-13 Hz/s) and
+the long term spin down remains stable over thirteen years with a rate of
+approximately -1E-15 Hz/s.",1111.6967v2
+2019-10-30,Global phase diagram of a spin-orbital Kondo impurity model and the suppression of Fermi-liquid scale,"Many correlated metallic materials are described by Landau Fermi-liquid
+theory at low energies, but for Hund metals the Fermi-liquid coherence scale
+$T_{\text{FL}}$ is found to be surprisingly small. In this Letter, we study the
+simplest impurity model relevant for Hund metals, the three-channel
+spin-orbital Kondo model, using the numerical renormalization group (NRG)
+method and compute its global phase diagram. In this framework, $T_{\text{FL}}$
+becomes arbitrarily small close to two new quantum critical points (QCPs) which
+we identify by tuning the spin or spin-orbital Kondo couplings into the
+ferromagnetic regimes. We find quantum phase transitions to a singular
+Fermi-liquid or a novel non-Fermi-liquid phase. The new non-Fermi-liquid phase
+shows frustrated behavior involving alternating overscreenings in spin and
+orbital sectors, with universal power laws in the spin ($\omega^{-1/5}$),
+orbital ($\omega^{1/5}$) and spin-orbital ($\omega^1$) dynamical
+susceptibilities. These power laws, and the NRG eigenlevel spectra, can be
+fully understood using conformal field theory arguments, which also clarify the
+nature of the non-Fermi-liquid phase.",1910.13643v2
+2023-12-07,Unusual Sign Reversal of Field-like Spin-Orbit Torque in Pt/Ni/Py with an Ultrathin Ni Spacer,"The magnetization manipulation by spin-orbit torques (SOTs) in
+nonmagnetic-metal (NM)/ferromagnet (FM) heterostructures has provided great
+opportunities for spin devices. Besides the conventional spin Hall effect (SHE)
+in heavy metals with strong spin-orbit coupling, the orbital currents have been
+proposed to be another promising approach to generate strong SOTs. Here, we
+systematically study the SOTs efficiency and its dependence on the FM thickness
+and different NM/FM interfaces in two prototypical Pt/Py and Ta/Py systems by
+inserting an ultrathin magnetic layer (0.4 nm thick ML = Co, Fe, Gd, and Ni).
+The dampinglike (DL) torque efficiency $\xi_{DL}$ is significantly enhanced by
+inserting ultrathin Co, Fe, and Ni layers and is noticeably suppressed for the
+Gd insertion. Moreover, the Ni insertion results in a sign change of the
+field-like (FL) torque in Pt/Py and substantially reduces $\xi_{DL}$ in Ta/Py.
+These results are likely related to the additional spin currents generated by
+combining the orbital Hall effect (OHE) in the NM and orbital-to-spin
+conversion in the ML insertion layer and/or their interfaces, especially for
+the Ni insertion. Our results demonstrate that inserting ultrathin ML can
+effectively manipulate the strength and sign of the SOTs, which would be
+helpful for spintronics applications.",2312.04276v2
+2017-10-31,Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature,"Graphene has emerged as the foremost material for future two-dimensional
+spintronics due to its tuneable electronic properties. In graphene, spin
+information can be transported over long distances and, in principle, be
+manipulated by using magnetic correlations or large spin-orbit coupling (SOC)
+induced by proximity effects. In particular, a dramatic SOC enhancement has
+been predicted when interfacing graphene with a semiconducting transition metal
+dechalcogenide, such as tungsten disulphide (WS$_2$). Signatures of such an
+enhancement have recently been reported but the nature of the spin relaxation
+in these systems remains unknown. Here, we unambiguously demonstrate
+anisotropic spin dynamics in bilayer heterostructures comprising graphene and
+WS$_2$. By using out-of-plane spin precession, we show that the spin lifetime
+is largest when the spins point out of the graphene plane. Moreover, we observe
+that the spin lifetime varies over one order of magnitude depending on the spin
+orientation, indicating that the strong spin-valley coupling in WS$_2$ is
+imprinted in the bilayer and felt by the propagating spins. These findings
+provide a rich platform to explore coupled spin-valley phenomena and offer
+novel spin manipulation strategies based on spin relaxation anisotropy in
+two-dimensional materials.",1710.11568v3
+2013-07-08,5d transition metal oxide IrO2 as a material for spin current detection,"Devices based on a pure spin current (a flow of spin angular momentum) have
+been attracting increasing attention as key ingredients for low-dissipation
+electronics. To integrate such spintronics devices into charge-based
+technologies, an electric detection of spin current is essential. Inverse spin
+Hall effect converts a spin current into an electric voltage through spin-orbit
+coupling. Noble metals such as Pt and Pd, and also Cu-based alloys, owing to
+the large direct spin Hall effect, have been regarded as potential materials
+for a spin-current injector. Those materials, however, are not promising as a
+spin-current detector based on inverse spin Hall effect. Their spin Hall
+resistivity rho_SH, representing the performance as a detector, is not large
+enough mainly due to their low charge resistivity. Here we demonstrate that
+heavy transition metal oxides can overcome such limitations inherent to
+metal-based spintronics materials. A binary 5d transition metal oxide IrO2,
+owing to its large resistivity as well as a large spin-orbit coupling
+associated with 5d character of conduction electrons, was found to show a
+gigantic rho_SH ~ 38 microohm cm at room temperature, one order of magnitude
+larger than those of noble metals and Cu-based alloys and even comparable to
+those of atomic layer thin film of W and Ta.",1307.2121v1
+2014-07-15,Classification of spin liquids on the square lattice with strong spin-orbit coupling,"Spin liquids represent exotic types of quantum matter that evade conventional
+symmetry-breaking order even at zero temperature. Exhaustive classifications of
+spin liquids have been carried out in several systems, particularly in the
+presence of full SU(2) spin-rotation symmetry. Real magnetic compounds,
+however, generically break SU(2) spin symmetry as a result of spin-orbit
+coupling - which in many materials provides an `order one' effect. We
+generalize previous works by using the projective symmetry group method to
+classify $Z_2$ spin liquids on the square lattice when SU(2) spin symmetry is
+maximally lifted. We find that, counterintuitively, the lifting of spin
+symmetry actually results in vastly more spin liquid phases compared to
+SU(2)-invariant systems. A generic feature of the SU(2)-broken case is that the
+spinons naturally undergo $p+ip$ pairing; consequently, many of these $Z_2$
+spin liquids feature a topologically nontrivial spinon band structure
+supporting gapless Majorana edge states. We study in detail several spin-liquid
+phases with varying numbers of gapless edge states and discuss their
+topological protection. The edge states are often protected by a combination of
+time reversal and lattice symmetries and hence resemble recently proposed
+topological crystalline superconductors.",1407.4124v1
+2016-11-10,Spin-charge coupled dynamics driven by a time-dependent magnetization,"The spin-charge coupled dynamics in a thin, magnetized metallic system are
+investigated. The effective driving force acting on the charge carriers is
+generated by a dynamical magnetic texture, which can be induced, e.g., by a
+magnetic material in contact with a normal-metal system. We consider a general
+inversion-asymmetric substrate/normal-metal/magnet structure, which, by
+specifying the precise nature of each layer, can mimick various experimentally
+employed setups. Inversion symmetry breaking gives rise to an effective Rashba
+spin-orbit interaction. We derive general spin-charge kinetic equations which
+show that such spin-orbit interaction, together with anisotropic Elliott-Yafet
+spin relaxation, yields significant corrections to the magnetization-induced
+dynamics. In particular, we present a consistent treatment of the spin density
+and spin current contributions to the equations of motion, inter alia
+identifying a novel term in the effective force which appears due to a spin
+current polarized parallel to the magnetization. This ""inverse spin filter""
+contribution depends markedly on the parameter which describes the anisotropy
+in spin relaxation. To further highlight the physical meaning of the different
+contributions, the spin pumping configuration of typical experimental setups is
+analyzed in detail. In the two-dimensional limit the build-up of a DC voltage
+is dominated by the spin galvanic (inverse Edelstein) effect. A measuring
+scheme that could isolate this contribution is discussed.",1611.03378v3
+2019-07-26,Nonlocal magnetolectric effects in diffusive conductors with spatially inhomogeneous spin-orbit coupling,"We present a theoretical study of nonlocal magnetoelectric effects in
+diffusive hybrid structures with an intrinsic linear-in-momentum spin-orbit
+coupling (SOC) which is assumed to be spatially inhomogeneous. Our analysis is
+based on the SU(2)-covariant drift-diffusion equations from which we derive the
+BC at hybrid interfaces. Within this formulation, the spin current is
+covariantly conserved when the spin relaxation is only due to the intrinsic
+SOC. This conservation leads to the absence of spin Hall (SH) currents in
+homogeneous systems. We also consider extrinsic sources of relaxation (ESR), as
+magnetic impurities, which break the covariant spin conservation, and may lead
+to SH currents. We apply our model to describe nonlocal transport in a system
+with an interface separating two regions: one normal region without intrinsic
+SOC and one with a Rashba SOC. We first explore the inverse spin-galvanic
+effect, i.e., a spin polarization induced by an electric field. We demonstrate
+how the spatial behavior of such spin density depends on both, the direction of
+the electric field and the strength of the ESR rate. We also study the
+spin-to-charge conversion, and compute the charge current and the distribution
+of electrochemical potential in the Rashba region induced by a spin current
+injected into the normal region. In systems with an inhomogeneous SOC varying
+in one spatial direction, we find an interesting nonlocal reciprocity between
+the spin density induced by a charge current at a given point in space, and the
+spatially integrated current induced by a spin density injected at the same
+point.",1907.11688v2
+2021-03-16,Large Spin-to-Charge Conversion in Ultrathin Gold-Silicon Multilayers,"Investigation of the spin Hall effect in gold has triggered increasing
+interest over the past decade, since gold combines the properties of a large
+bulk spin diffusion length and strong interfacial spin-orbit coupling. However,
+discrepancies between the values of the spin Hall angle of gold reported in the
+literature have brought into question the microscopic origin of the spin Hall
+effect in Au. Here, we investigate the thickness dependence of the spin-charge
+conversion efficiency in single Au films and ultrathin Au/Si multilayers by
+non-local transport and spin-torque ferromagnetic resonance measurements. We
+show that the spin-charge conversion efficiency is strongly enhanced in
+ultrathin Au/Si multilayers, reaching exceedingly large values of 0.99 +/- 0.34
+when the thickness of the individual Au layers is scaled down to 2 nm. These
+findings reveal the coexistence of a strong interfacial spin-orbit coupling
+effect which becomes dominant in ultrathin Au, and bulk spin Hall effect with a
+relatively low bulk spin Hall angle of 0.012 +/- 0.005. Our experimental
+results suggest the key role of the Rashba-Edelstein effect in the
+spin-to-charge conversion in ultrathin Au.",2103.08876v1
+2023-07-24,The Spin Point Groups and their Representations,"The spin point groups are finite groups whose elements act on both real space
+and spin space. Among these groups are the magnetic point groups in the case
+where the real and spin space operations are locked to one another. The
+magnetic point groups are central to magnetic crystallography for strong
+spin-orbit coupled systems and the spin point groups generalize these to the
+intermediate and weak spin-orbit coupled cases. The spin point groups were
+introduced in the 1960's and enumerated shortly thereafter. In this paper, we
+complete the theory of spin point groups by presenting an account of these
+groups and their representation theory. Our main findings are that the
+so-called nontrivial spin point groups (numbering 598 groups) have co-irreps
+corresponding exactly to the (co-)irreps of regular or black and white groups
+and we tabulate this correspondence for each nontrivial group. However a total
+spin group, comprising the product of a nontrivial group and a spin-only group,
+has new co-irreps in cases where there is continuous rotational freedom. We
+provide explicit co-irrep tables for all these instances. We also discuss new
+forms of spin-only group extending the Litvin-Opechowski classes. To exhibit
+the usefulness of these groups to physically relevant problems we discuss a
+number of examples from electronic band structures of altermagnets to magnons.",2307.12784v2
+2005-10-27,Spin Decay in a Quantum Dot Coupled to a Quantum Point Contact,"We consider a mechanism of spin decay for an electron spin in a quantum dot
+due to coupling to a nearby quantum point contact (QPC) with and without an
+applied bias voltage. The coupling of spin to charge is induced by the
+spin-orbit interaction in the presence of a magnetic field. We perform a
+microscopic calculation of the effective Hamiltonian coupling constants to
+obtain the QPC-induced spin relaxation and decoherence rates in a realistic
+system. This rate is shown to be proportional to the shot noise of the QPC in
+the regime of large bias voltage and scales as $a^{-6}$ where $a$ is the
+distance between the quantum dot and the QPC. We find that, for some specific
+orientations of the setup with respect to the crystallographic axes, the
+QPC-induced spin relaxation and decoherence rates vanish, while the charge
+sensitivity of the QPC is not changed. This result can be used in experiments
+to minimize QPC-induced spin decay in read-out schemes.",0510758v1
+2017-12-13,Coupled spin and electron-phonon dynamics at the relativistic Tl/Si(111) surface,"We investigate the role played by the electron spin and the spin-orbit
+interaction on the exceptional electronphonon coupling at the Tl/Si(111)
+surface. Our first-principles calculations demonstrate that the particular spin
+pattern of this system dominates the whole low-energy electron-phonon physics,
+which is remarkably explained by forbidden spin-spin scattering channels. In
+particular, we show that the strength of the electron-phonon coupling appears
+drastically weakened for surface states close to the K and K' valleys, which is
+unambiguously attributed to the spin polarization through the associated
+modulation due to the spinor overlaps. However, close to the {\Gamma} point,
+the particular spin pattern in this area is less effective in damping the
+electron-phonon matrix elements, and the result is an exceptional strength of
+electron-phonon coupling parameter {\lambda} ~ 1.4. These results are
+rationalized by a simple model for the electron-phonon matrix elements
+including the spinor terms.",1712.04868v3
+2022-03-30,Angular momentum transfer via relativistic spin-lattice coupling from first principles,"The transfer and control of angular momentum is a key aspect for spintronic
+applications. Only recently, it was shown that it is possible to transfer
+angular momentum from the spin system to the lattice on ultrashort time scales.
+In an attempt to contribute to the understanding of angular momentum transfer
+between spin and lattice degrees of freedom we present a scheme to calculate
+fully-relativistic spin-lattice coupling parameters from first-principles. By
+treating changes in the spin configuration and atomic positions at the same
+level, closed expressions for the atomic spin-lattice coupling parameters can
+be derived in a coherent manner up to any order. Analyzing the properties of
+these parameters, in particular their dependence on spin-orbit coupling, we
+find that even in bcc Fe the leading term for the angular momentum exchange
+between the spin system and the lattice is a Dzyaloshiskii-Moriya-type
+interaction, which is due to the symmetry breaking distortion of the lattice.",2203.16144v1
+2024-01-20,Phonon-mediated spin transport in quantum paraelectric metals,"The concept of ferroelectricity is now often extended to include continuous
+inversion symmetry-breaking transitions in various metals and doped
+semiconductors. Paraelectric metals near ferroelectric quantum criticality,
+which we term `quantum paraelectric metals,' typically possess soft transverse
+optical phonons that have Rashba-type coupling to itinerant electrons in the
+presence of spin-orbit coupling. We find through the Kubo formula calculation
+that such Rashba electron-phonon coupling has a profound impact on electron
+spin transport. While the spin Hall effect arising from non-trivial electronic
+band structures has been studied extensively, we find here the presence of the
+Rashba electron-phonon coupling can give rise to spin current, including spin
+Hall current, in response to an inhomogeneous electric field even with a
+completely trivial band structure. Furthermore, this spin conductivity displays
+unconventional characteristics, such as quadrupolar symmetry associated with
+the wave vector of the electric field and a thermal activation behavior
+characterized by scaling laws dependent on the phonon frequency to temperature
+ratio. These findings shed light on exotic electronic transport phenomena
+originating from ferroelectric quantum criticality, highlighting the intricate
+interplay of charge and spin degrees of freedom.",2401.11164v1
+2014-03-31,Orbital-dependent singlet dimers and orbital-selective Peierls transitions in transition metal compounds,"We show that in transition metal compounds containing structural metal dimers
+there may exist in the presence of different orbitals a special state with
+partial formation of singlets by electrons on one orbital, while others are
+effectively decoupled and may give e.g. long-range magnetic order or stay
+paramagnetic. Similar situation can be realized in dimers spontaneously formed
+at structural phase transitions, which can be called orbital-selective Peierls
+transition. This can occur in case of strongly nonuniform hopping integrals for
+different orbitals and small intra-atomic Hund's rule coupling JH. Yet another
+consequence of this picture is that for odd number of electrons per dimer there
+exist competition between double exchange mechanism of ferromagnetism, and the
+formation of singlet dimer by electron on one orbital, with remaining electrons
+giving a net spin of a dimer. The first case is realized for strong Hund's rule
+coupling, typical for 3d compounds, whereas the second is more plausible for
+4d-5d compounds. We discuss some implications of these phenomena, and consider
+examples of real systems, in which orbital-selective phase seems to be
+realized.",1403.7871v2
+2016-08-18,Non-local correlations in the orbital selective Mott phase of a one dimensional multi-orbital Hubbard model,"We study non-local correlations in a three-orbital Hubbard model defined on
+an extended one-dimensional chain using determinant quantum Monte Carlo and
+density matrix renormalization group methods. We focus on a parameter with
+robust Hund's coupling, which produces an orbital selective Mott phase (OSMP)
+at intermediate values of the Hubbard U, as well as an orbitally ordered
+ferromagnetic insulating state at stronger coupling. An examination of the
+orbital and spin-correlation functions indicates that the orbital ordering
+occurs before the onset of magnetic correlations in this parameter regime as a
+function of temperature. In the OSMP, we find that the self-energy for the
+itinerant electrons is momentum dependent, indicating a degree of non-local
+correlations while the localized electrons have largely momentum independent
+self-energies. These non-local correlations also produce relative shifts of the
+hole-like and electron-like bands within our model. The overall momentum
+dependence of these quantities is strongly suppressed in the orbitally-ordered
+insulating phase.",1608.05297v1
+2023-08-18,Correlation Effects and Concomitant Two-Orbital $s_\pm$-Wave Superconductivity in La$_3$Ni$_2$O$_7$ under High Pressure,"Possible high-$T_c$ superconductivity (SC) has been found experimentally in
+the bilayer material La$_3$Ni$_2$O$_7$ under high pressure recently, in which
+the Ni-$3d_{3z^2-r^2}$ and $3d_{x^2-y^2}$ orbitals are expected to play a key
+role in the electronic structure and the SC. Here we study the two-orbital
+electron correlations and the nature of the SC using the bilayer two-orbital
+Hubbard model downfolded from the band structure of La3Ni2O7 in the framework
+of the dynamical mean-field theory. We find that each of the two orbitals forms
+$s_\pm$-wave SC pairing. Because of the nonlocal inter-orbital hoppings, the
+two-orbital SCs are concomitant and they transition to Mott insulating states
+simultaneously when tuning the system to half filling. The Hund's coupling
+induced local inter-orbital spin coupling enhances the electron correlations
+pronouncedly and is crucial to the SC.",2308.09698v1
+2009-01-28,Variational Monte Carlo study of ferromagnetism in the two-orbital Hubbard model on a square lattice,"To understand effects of orbital degeneracy on magnetism, in particular
+effects of Hund's rule coupling, we study the two-orbital Hubbard model on a
+square lattice by a variational Monte Carlo method. As a variational wave
+function, we consider a Gutzwiller projected wave function for a staggered spin
+and/or orbital ordered state. We find a ferromagnetic phase with staggered
+orbital order around quarter-filling, i.e., electron number n=1 per site, and
+an antiferromagnetic phase without orbital order around half-filling n=2. In
+addition, we find that another ferromagnetic phase without orbital order
+realizes in a wide filling region for large Hund's rule coupling. These two
+ferromagnetic states are metallic except for quarter filling. We show that
+orbital degeneracy and strong correlation effects stabilize the ferromagnetic
+states.",0901.4415v1
+2013-11-26,Spin-orbit coupling and chaotic rotation for coorbital bodies in quasi-circular orbits,"Coorbital bodies are observed around the Sun sharing their orbits with the
+planets, but also in some pairs of satellites around Saturn. The existence of
+coorbital planets around other stars has also been proposed. For close-in
+planets and satellites, the rotation slowly evolves due to dissipative tidal
+effects until some kind of equilibrium is reached. When the orbits are nearly
+circular, the rotation period is believed to always end synchronous with the
+orbital period. Here we demonstrate that for coorbital bodies in quasi-circular
+orbits, stable non-synchronous rotation is possible for a wide range of mass
+ratios and body shapes. We show the existence of an entirely new family of
+spin-orbit resonances at the frequencies $n\pm k\nu/2$, where $n$ is the
+orbital mean motion, $\nu$ the orbital libration frequency, and $k$ an integer.
+In addition, when the natural rotational libration frequency due to the axial
+asymmetry, $\sigma$, has the same magnitude as $\nu$, the rotation becomes
+chaotic. Saturn coorbital satellites are synchronous since $\nu\ll\sigma$, but
+coorbital exoplanets may present non-synchronous or chaotic rotation. Our
+results prove that the spin dynamics of a body cannot be dissociated from its
+orbital environment. We further anticipate that a similar mechanism may affect
+the rotation of bodies in any mean-motion resonance.",1311.6750v2
+1993-03-23,Relativistic Dynamics of Spin in Strong External Fields,"The dynamics of relativistic spinning particles in strong external
+electromagnetic or gravitational fields is discussed. Spin-orbit coupling is
+shown to affect such relativistic phenomena as time-dilation and perihelion
+shift. Possible applications include muon decay in a magnetic field and the
+dynamics of neutron stars in binary systems.",9303124v1
+1995-08-02,Spin-dependent resonant tunneling through semimetallic ErAs quantum wells,"Resonant tunneling through semimetallic ErAs quantum wells embedded in GaAs
+structures with AlAs barriers was recently found to exhibit an intriguing
+behavior in magnetic fields which is explained in terms of tunneling selection
+rules and the spin-polarized band structure including spin-orbit coupling.",9508003v1
+2010-01-11,The quantum spin Hall effect and topological insulators,"In topological insulators, spin-orbit coupling and time-reversal symmetry
+combine to form a novel state of matter predicted to have exotic physical
+properties.",1001.1602v1
+1999-10-07,Spin interactions and switching in vertically tunnel-coupled quantum dots,"We determine the spin exchange coupling J between two electrons located in
+two vertically tunnel-coupled quantum dots, and its variation when magnetic (B)
+and electric (E) fields (both in-plane and perpendicular) are applied. We
+predict a strong decrease of J as the in-plane B field is increased, mainly due
+to orbital compression. Combined with the Zeeman splitting, this leads to a
+singlet-triplet crossing, which can be observed as a pronounced jump in the
+magnetization at in-plane fields of a few Tesla, and perpendicular fields of
+the order of 10 Tesla for typical self-assembled dots. We use harmonic
+potentials to model the confining of electrons, and calculate the exchange J
+using the Heitler-London and Hund-Mulliken technique, including the long-range
+Coulomb interaction. With our results we provide experimental criteria for the
+distinction of singlet and triplet states and therefore for microscopic spin
+measurements. In the case where dots of different sizes are coupled, we present
+a simple method to switch on and off the spin coupling with exponential
+sensitivity using an in-plane electric field. Switching the spin coupling is
+essential for quantum computation using electronic spins as qubits.",9910105v1
+2018-07-15,K-matrix formulation of two-particle scattering in a wave guide in the presence of one-dimensional spin-orbit coupling,"The creation of artificial gauge fields in neutral ultracold atom systems has
+opened the possibility to study the effects of spin-orbit coupling terms in
+clean environments. This work considers the multi-channel scattering properties
+of two atoms confined by a wave guide in the presence of spin-orbit coupling
+terms within a K-matrix scattering framework. The tunability of resonances,
+induced by the interplay of the external wave guide geometry, the interactions,
+and the spin-orbit coupling terms, is demonstrated. Our results for the
+K-matrix elements as well as partial and total reflection coefficients for two
+identical fermions interacting through a finite-range interaction potential in
+the singlet channel only are compared with those obtained for a strictly
+one-dimensional effective low- energy Hamiltonian, which uses the effective
+coupling constant derived in Zhang et al. [Scientific Reports 4, 1 (2014)] and
+Zhang et al. [Phys. Rev. A 88, 053605 (2013)] as input. In the regime where the
+effective Hamiltonian is applicable, good agreement is obtained, provided the
+energy- dependence of the coupling constant is accounted for. Our approach
+naturally describes the energy regime in which the bands associated with
+excited transverse modes lie below a subset of the bands associated with the
+lowest transverse modes. The threshold behavior is discussed and scattering
+observables are linked to bound state properties.",1807.05564v2
+2003-09-19,Spin-orbit origin of large reduction of the effective moment in Na2V3O7*,"We have shown that the observed large reduction of the effective moment and
+the drastic violation of the Curie-Weiss law in Na2V3O7 (Phys. Rev. Lett. 90
+(2003) 167202) is caused by conventional crystal-field interactions and the
+intra-atomic spin-orbit coupling of the V4+ ion. The fine discrete electronic
+structure of the 3d1 configuration with the weakly-magnetic Kramers-doublet
+ground state, caused by the large orbital moment, is the reason for anomalous
+properties of Na2V3O7. Moreover, according to the Quantum Atomistic Solid-State
+Theory (QUASST) Na2V3O7 is expected to exhibit pronounced heavy-fermion
+phenomena at low temperatures.
+  PACS: 71.70.E, 75.10.D
+  Keywords: crystal-field interactions, spin-orbit coupling, orbital moment,
+Na2V3O7",0309460v2
+2005-03-16,The atomic-start description of NiO,"We have calculated magnetic properties and the electronic structure of NiO
+both in the paramagnetic and in magnetically-ordered state as well as
+zero-temperature properties and thermodynamics within the strongly-correlated
+crystal-field approach. It is in agreement with a Mott's suggestion that NiO is
+an insulator due to strong electron correlations. We have quantified
+crystal-field, spin-orbit and magnetic interactions of the Ni2+ ion in NiO. We
+have obtained that E_dd >> E_CF(=2.0 eV) >> E_{s-o}(=0.29 eV) > E_mag(=0.07
+eV). The orbital moment of 0.54 mu_B amounts at 0 K, in the
+magnetically-ordered state, to about 20% of the total moment (2.53 mu_B). Our
+studies indicate that it is the highest time to ""unquench"" orbital magnetic
+moment in 3d solid-state physics and the necessity to take always into account
+strong intra-atomic correlations among d electrons and the intra-atomic
+spin-orbit coupling.
+  Pacs: 75.25.+z, 75.10.Dg
+  Keywords: Crystalline Electric Field, 3d oxides, magnetism, spin-orbit
+coupling NiO",0503407v1
+2006-01-16,Fermi arc in doped high-Tc cuprates,"We propose a $d$-density wave induced by the spin-orbit coupling in the CuO
+plane. The spectral function of high-temperature superconductors in the under
+doped and lightly doped regions is calculated in order to explain the Fermi arc
+spectra observed recently by angle-resolved photoemission spectroscopy. We take
+into account the tilting of CuO octahedra as well as the on-site
+Coulombrepulsive interaction; the tilted octahedra induce the staggered
+transfer integral between $p_{x,y}$ orbitals and Cu $t_{2g}$ orbitals, and
+bring about nontrivial effects of spin-orbit coupling for the $d$ electrons in
+the CuO plane. The spectral weight shows a peak at around ($\pi/2$,$\pi/2$) for
+light doping and extends around this point forming an arc as the carrier
+density increases, where the spectra for light doping grow continuously to be
+the spectra in the optimally doped region. This behavior significantly agrees
+with that of the angle-resolved photoemissionspectroscopy spectra. Furthermore,
+the spin-orbit term and staggered transfer effectively induce a flux state, a
+pseudo-gap with time-reversal symmetry breaking. We have a nodal metallic state
+in the light-doping case since the pseudogap has a $d_{x^2-y^2}$ symmetry.",0601329v1
+2008-10-14,Mott insulating state in a quarter-filled two-orbital Hubbard chain with different bandwidths,"We investigate the ground-state properties of the one-dimensional two-band
+Hubbard model with different bandwidths. The density-matrix renormalization
+group method is applied to calculate the averaged electron occupancies $n$ as a
+function of the chemical potential $\mu$. Both at quarter and half fillings,
+""charge plateaux"" appear in the $n$-$\mu$ plot, where $d\mu/dn$ diverges and
+the Mott insulating states are realized. To see how the orbital polarization in
+the one-quarter charge plateau develops, we apply the second-order perturbation
+theory from the strong-coupling limit at quarter filling. The resultant
+Kugel-Khomskii spin-orbital model includes a $magnetic$ field coupled to
+orbital pseudo-spins. This field originates from the discrepancy between the
+two bandwidths and leads to a finite orbital pseudo-spin magnetization.",0810.2539v1
+2009-11-30,Antiferromagnetic and structural transitions in the superoxide KO2 from first principles: A 2p-electron system with spin-orbital-lattice coupling,"KO2 exhibits concomitant antiferromagnetic (AFM) and structural transitions,
+both of which originate from the open-shell 2p electrons of O$_{2}^{-}$
+molecules. The structural transition is accompanied by the coherent tilting of
+O$_{2}^{-}$ molecular axes. The interplay among the spin-orbital-lattice
+degrees of freedom in KO2 is investigated by employing the first-principles
+electronic structure theory and the kinetic-exchange interaction scheme. We
+have shown that the insulating nature of the high symmetry phase of KO2 at high
+temperature (T) arises from the combined effect of the spin-orbit coupling and
+the strong Coulomb correlation of O 2p electrons. In contrast, for the low
+symmetry phase of KO2 at low T with the tilted O$_{2}^{-}$ molecular axes, the
+band gap and the orbital ordering are driven by the combined effects of the
+crystal-field and the strong Coulomb correlation. We have verified that the
+emergence of the O 2p ferro-orbital ordering is essential to achieve the
+observed AFM structure for KO2.",0911.5677v2
+2010-09-02,Spin and Orbital Order of the Vanadium Spinel MgV2O4,"We present a unique study of the frustrated spinel MgV2O4 which possesses
+highly coupled spin, lattice and orbital degrees of freedom. Using large
+single-crystal and powder samples, we find a distortion from spinel at room
+temperature (space group F-43m) which allows for a greater trigonal distortion
+of the VO6 octahedra and a low temperature space group (I-4m2) that maintains
+the mirror plane symmetry. The magnetic structure that develops below 42 K
+consists of antiferromagnetic chains with a strongly reduced moment while
+inelastic neutron scattering reveals one-dimensional behavior and a single band
+of excitations. The implications of these results are discussed in terms of
+various orbital ordering scenarios. We conclude that although spin-orbit
+coupling must be significant to maintain the mirror plane symmetry, the
+trigonal distortion is large enough to mix the 3d levels leading to a wave
+function of mixed real and complex orbitals.",1009.0429v2
+2012-09-17,Spin-Fluctuation-Driven Orbital Nematic Order in Ru-Oxides: Self-Consistent Vertex Correction Analysis for Two-Orbital Model,"To reveal the origin of the ""nematic electronic fluid phase"" in
+Sr$_3$Ru$_2$O$_7$, we apply the self-consistent vertex correction analysis to
+the ($d_{xz},d_{yz}$)-orbital Hubbard model. It is found that the
+Aslamazov-Larkin type vertex correction causes the strong coupling between spin
+and orbital fluctuations, which corresponds to the Kugel-Khomskii spin-orbital
+coupling in the local picture. Due to this mechanism, orbital nematic order
+with $C_2$ symmetry is induced by the magnetic quantum criticality in
+multiorbital systems, while this mechanism is ignored in the
+random-phase-approximation. The present study naturally explains the intimate
+relation between the magnetic quantum criticality and the nematic state in
+Sr$_3$Ru$_2$O$_7$ and Fe-based superconductors.",1209.3629v2
+2015-08-06,Molecular orbital polarization in Na2Ti2Sb2O: microscopic route to metal-metal transition without spontaneous symmetry breaking,"Ordered phases such as charge- and spin-density wave state accompany either
+full or partial gapping of Fermi surface (FS) leading a metal-insulator or
+metal-metal transition (MMT). However, there are examples of MMT without any
+signatures of symmetry breaking. One example is Na$_2$Ti$_2$Sb$_2$O, where a
+partial gapping of FS is observed but a density wave ordering has not been
+found. Here we propose a microscopic mechanism of such a MMT which occurs due
+to a momentum dependent spin-orbit coupled molecular orbital polarization.
+Since a molecular $d$ orbital polarization is present due to a small spin-orbit
+coupling of Ti, there is no spontaneous symmetry breaking involved. However, a
+sharp increase of polarization happens above a critical electron interaction
+which gaps out the $d$ orbtial FS and reduces the density of states
+significantly, while the rest of FS associated with Sb $p$ orbtials is almost
+intact across MMT. Experimental implications to test our proposal and
+applications to other systems are also discussed.",1508.01519v1
+2016-03-28,Orbital-FFLO state in a chain of high spin ultracold atoms,"Recent experiments with Yb-173 and Sr-87 isotopes provide new possibilities
+to study high spin two-orbital systems. Within these experiments part of the
+atoms are excited to a higher energy metastable electronic state mimicking an
+additional internal (orbital) degree of freedom. The interaction between the
+atoms depends on the orbital states, therefore four different scattering
+channels can be identified in the system characterized by four independent
+couplings. When the system is confined into a one-dimensional chain the
+scattering lengths can be tuned by changing the transverse confinement, and
+driven through four resonances. Using the new available experimental data of
+the scattering lengths we analyze the phase diagram of the one-dimensional
+system as the couplings are tuned via transverse confinement, and the
+populations of the two orbital states are changed. We found that three orders
+compete showing power law decay: a state with dominant density wave
+fluctuations, another one with spin density fluctuations, and a third one
+characterized by exotic Fulde-Ferrell-Larkin-Ovchinnikov-like pairs consisting
+one atom in the electronic ground state and one in the excited state. We also
+show that sufficiently close to the resonances the compressibility of the
+system starts to diverge indicating that the emerging order is unstable and
+collapses to a phase separated state with a first order phase transition.",1603.08505v1
+2018-03-10,Optical control of competing exchange interactions and coherent spin-charge coupling in two-orbital Mott insulators,"In order to have a better understanding of ultrafast electrical control of
+exchange interactions in multi-orbital systems, we study a two-orbital Hubbard
+model at half filling under the action of a time-periodic electric field. Using
+suitable projection operators and a generalized time-dependent canonical
+transformation, we derive an effective Hamiltonian which describes two
+different regimes. First, for a wide range of non-resonant frequencies, we find
+a change of the bilinear Heisenberg exchange $J_{\textrm{ex}}$ that is
+analogous to the single-orbital case. Moreover we demonstrate that also the
+additional biquadratic exchange interaction $B_{\textrm{ex}}$ can be enhanced,
+reduced and even change sign depending on the electric field. Second, for
+special driving frequencies, we demonstrate a novel spin-charge coupling
+phenomenon enabling coherent transfer between spin and charge degrees of
+freedom of doubly ionized states. These results are confirmed by an exact
+time-evolution of the full two-orbital Mott-Hubbard Hamiltonian.",1803.03796v2
+2019-03-12,Time-reversal symmetry breaking superconductivity in hole-doped monolayer MoS$_{2}$,"We investigate the nature of the time-reversal breaking pairing state in the
+hole-doped monolayer MoS$_{2}$ on the basis of the realistic three-orbital
+attractive Hubbard-like model with the atomic spin-orbit coupling. Due to the
+multi-band features arising from the Mo $d$ orbitals in the noncentrosymmetric
+crystal structure, the Lifshitz transition takes place upon hole doping. Across
+the Lifshitz transition point, the sign of the relative phase between the
+Cooper-pair components drastically changes, leading to the emergence of the
+time-reversal breaking phase with complex gap functions. It is shown that this
+intriguing pairing state is characterized by the finite momentum-space
+distributions of the orbital and spin angular momentum with three-fold
+rotational symmetry on the Fermi-surface pockets around K and K$'$ points. The
+present mechanism for the time-reversal breaking superconductivity can
+ubiquitously be applied to spin-orbit-coupled metals in noncentrosymmetric
+crystal structures.",1903.04830v2
+2014-02-05,Signatures of Rashba Spin-Orbit Interaction in Charge and Spin Properties of Quantum Hall Systems,"We study the local equilibrium properties of two-dimensional electron gases
+at high magnetic fields in the presence of random smooth electrostatic
+disorder, Rashba spin-orbit coupling, and the Zeeman interaction. Using a
+systematic magnetic length ($l_B$) expansion within a Green's function
+framework we derive quantum functionals for the local spin-resolved particle
+and current densities which can be useful for future studies combining disorder
+and mean-field electron-electron interaction in the quantum Hall regime. We
+point out that the spin polarization presents a peculiar spatial dependence
+which can be used to determine the strength of the Rashba coupling by local
+probes. The spatial structure of the current density, consisting of both
+compressible and incompressible contributions, also essentially reflects the
+effects of Rashba spin-orbit interaction on the energy spectrum. We show that
+in the semiclassical limit $l_B \rightarrow 0$ the local Hall conductivity
+remains, however, still quantized in units of $e^2/h$ for any finite strength
+of the spin-orbit interaction. In contrast, it becomes half-integer quantized
+when the latter is infinite, a situation which corresponds to a disordered
+topological insulator surface consisting of a single Dirac cone. Finally, we
+argue how to define at high magnetic fields a spin Hall conductivity related to
+a dissipationless angular momentum flow, which is characterized by a sequence
+of plateaus as a function of the inverse magnetic field (thus free of
+resonances).",1402.1090v2
+2018-12-01,Rectification in Spin-Orbit Materials Using Low Energy Barrier Magnets,"The coupling of spin-orbit materials to high energy barrier ($\sim$40-60
+$k_BT$) nano-magnets has attracted growing interest for exciting new physics
+and various spintronic applications. We predict that a coupling between the
+spin-momentum locking (SML) observed in spin-orbit materials and low-energy
+barrier magnets (LBM) should exhibit a unique multi-terminal rectification for
+arbitrarily small amplitude channel currents. The basic idea is to measure the
+charge current induced spin accumulation in the SML channel in the form of a
+magnetization dependent voltage using an LBM, either with an in-plane or
+perpendicular anisotropy (IMA or PMA). The LBM feels an instantaneous
+spin-orbit torque due to the accumulated spins in the channel which causes the
+average magnetization to follow the current, leading to the non-linear
+rectification. We discuss the frequency band of this multi-terminal
+rectification which can be understood in terms of the angular momentum
+conservation in the LBM. For a fixed spin-current from the SML channel, the
+frequency band is same for LBMs with IMA and PMA, as long as they have the same
+total magnetic moment in a given volume. The proposed all-metallic structure
+could find application as highly sensitive passive rf detectors and as energy
+harvesters from weak ambient sources where standard technologies may not
+operate.",1812.00286v2
+2019-08-29,Gate-tunable Rashba spin-orbit coupling and spin polarization at diluted oxide interfaces,"Diluted oxide interface of LaAl1-xMnxO/SrTiO3 (LAMO/STO) provides a new way
+of tuning the ground states of the interface between the two band insulators of
+LAO and STO from metallic/superconducting to highly insulating. Increasing the
+Mn doping level (x) leads to a delicate control of the carrier density as well
+as a raise in the electron mobility and spin polarization. Herein, we
+demonstrate a tunable Rashba spin-orbit coupling (SOC) and spin polarization of
+LAMO/STO (0.2 <= x <= 0.3) by applying a back gate. The presence of SOC causes
+the splitting of energy band into two branches by a spin splitting energy. The
+maximum spin splitting energy depends on the Mn doping and decreases with the
+increasing Mn content and then vanishes at x = 0.3. The carrier density
+dependence of the spin splitting energy for different compositions shows a
+dome-shaped behavior with a maximum at different normalized carrier density.
+These findings have not yet been observed in LAO/STO interfaces. A fully
+back-gate-tunable spin-polarized 2DEL is observed at the interface with x = 0.3
+where only dxy orbits are populated (5.3E12 cm-2 <= ns <= 1.0E13 cm-2). The
+present results shed light on unexplored territory in SOC at STO-base oxide
+heterostructures and make LAMO/STO an intriguing platform for spin-related
+phenomena in 3d-electron systems.",1908.11167v1
+2017-08-15,Electron g-factor of valley states in realistic silicon quantum dots,"We theoretically model the spin-orbit interaction in silicon quantum dot
+devices, relevant for quantum computation and spintronics. Our model is based
+on a modified effective mass approach with spin-valley boundary conditions,
+derived from the interface symmetry under presence of perpendicular to the
+interface electric field. The g-factor renormalization in the two lowest valley
+states is explained by the interface-induced spin-orbit 2D (3D) interaction,
+favoring intervalley spin-flip tunneling over intravalley processes. We show
+that the quantum dot level structure makes only negligible higher order effects
+to the g-factor. We calculate the g-factor as a function of the magnetic field
+direction, which is sensitive to the interface symmetry. We identify spin-qubit
+dephasing sweet spots at certain directions of the magnetic field, where the
+g-factor renormalization is zeroed: these include perpendicular to the
+interface magnetic field, and also in-plain directions, the latter being
+defined by the interface-induced spin-orbit constants. The g-factor dependence
+on electric field opens the possibility for fast all-electric manipulation of
+an encoded, few electron spin-qubit, without the need of a nanomagnet or a
+nuclear spin-background. Our approach of an almost fully analytic theory allows
+for a deeper physical understanding of the importance of spin-orbit coupling to
+silicon spin qubits.",1708.04555v2
+2019-09-16,"Test black holes, scattering amplitudes and perturbations of Kerr spacetime","It has been suggested that amplitudes for quantum higher-spin massive
+particles exchanging gravitons lead, via a classical limit, to results for
+scattering of spinning black holes in general relativity, when the massive
+particles are in a certain way minimally coupled to gravity. Such limits of
+such amplitudes suggest, at least at lower orders in spin, up to second order
+in the gravitational constant $G$, that the classical aligned-spin scattering
+function for an arbitrary-mass-ratio two-spinning-black-hole system can be
+obtained by a simple kinematical mapping from that for a spinning test black
+hole scattering off a stationary background Kerr black hole. Here we test these
+suggestions, at orders beyond the reach of the post-Newtonian and
+post-Minkowskian results used in their initial partial verifications, by
+confronting them with results from general-relativistic ""self-force""
+calculations of the linear perturbations of a Kerr spacetime sourced by a small
+orbiting body, here considering only results for circular orbits in the
+equatorial plane. We translate between scattering and circular-orbit results by
+assuming the existence of a local-in-time canonical Hamiltonian governing the
+conservative dynamics of generic (bound and unbound) aligned-spin orbits, while
+employing the associated first law of spinning binary mechanics. We confirm,
+through linear order in the mass ratio, some previous conjectures which would
+begin to fill in the spin-dependent parts of the conservative dynamics for
+arbitrary-mass-ratio aligned-spin binary black holes at the fourth-and-a-half
+and fifth post-Newtonian orders.",1909.07361v1
+2011-08-01,Entangled spin-orbital phases in the bilayer Kugel-Khomskii model,"We derive the Kugel-Khomskii spin-orbital (SO) model for a bilayer and
+investigate its phase diagram depending on Hund's exchange $J_H$ and the $e_g$
+orbital splitting $E_z$. In the (classical) mean-field approach with on-site
+spin $<S_i^z>$ and orbital $<\tau_i^z>$ order parameters and factorized
+spin-and-orbital degrees of freedom, we demonstrate a competition between the
+phases with either $G$-type or $A$-type antiferromagnetic (AF) or ferromagnetic
+long-range order. Next we develop a Bethe-Peierls-Weiss method with a Lanczos
+exact diagonalization of a cube coupled to its neighbors in $ab$ planes by the
+mean-field terms --- this approach captures quantum fluctuations on the bonds
+which decide about the nature of disordered phases in the highly frustrated
+regime near the orbital degeneracy. We show that the long-range spin order is
+unstable in a large part of the phase diagram which contains then six phases,
+including also the valence-bond phase with interlayer spin singlets stabilized
+by holes in $3z^2-r^2$ orbitals (VB$z$ phase), a disordered plaquette
+valence-bond (PVB) phase and a crossover phase between the VB$z$ and the
+$A$-type AF phase. When on-site SO coupling is also included by the
+$<S_i^z\tau_i^z>$ order parameter, we discover in addition two entangled phases
+which compete with $A$-type AF phase and another crossover phase in between the
+$G$-AF phase with occupied $x^2-y^2$ orbitals and the PVB phase. Thus, the
+present bilayer model provides an example of SO entanglement which generates
+novel disordered phases. We analyze the order parameters in all phases and
+identify situations where SO entanglement is crucial and factorization of the
+spins and orbitals leads to qualitatively incorrect results. We point out that
+SO entanglement may play a role in a bilayer fluoride K$_3$Cu$_2$F$_7$ which is
+a realization of the VB$z$ phase.",1108.0279v1
+2004-05-21,Spintronics: Fundamentals and applications,"Spintronics, or spin electronics, involves the study of active control and
+manipulation of spin degrees of freedom in solid-state systems. This article
+reviews the current status of this subject, including both recent advances and
+well-established results. The primary focus is on the basic physical principles
+underlying the generation of carrier spin polarization, spin dynamics, and
+spin-polarized transport in semiconductors and metals. Spin transport differs
+from charge transport in that spin is a nonconserved quantity in solids due to
+spin-orbit and hyperfine coupling. The authors discuss in detail spin
+decoherence mechanisms in metals and semiconductors. Various theories of spin
+injection and spin-polarized transport are applied to hybrid structures
+relevant to spin-based devices and fundamental studies of materials properties.
+Experimental work is reviewed with the emphasis on projected applications, in
+which external electric and magnetic fields and illumination by light will be
+used to control spin and charge dynamics to create new functionalities not
+feasible or ineffective with conventional electronics.",0405528v1
+2005-07-10,Coulomb corrections to the extrinsic spin-Hall effect of a two-dimensional electron gas,"We develop the microscopic theory of the extrinsic spin Hall conductivity of
+a two-dimensional electron gas, including skew-scattering, side-jump, and
+Coulomb interaction effects. We find that while the spin-Hall conductivity
+connected with the side-jump is independent of the strength of
+electron-electron interactions, the skew-scattering term is reduced by the
+spin-Coulomb drag, so the total spin current and the total spin-Hall
+conductivity are reduced for typical experimental mobilities. Further, we
+predict that in paramagnetic systems the spin-Coulomb drag reduces the spin
+accumulations in two different ways: (i) directly through the reduction of the
+skew-scattering contribution (ii) indirectly through the reduction of the spin
+diffusion length. Explicit expressions for the various contributions to the
+spin Hall conductivity are obtained using an exactly solvable model of the
+skew-scattering.",0507228v4
+2006-10-16,Spin-Hall interface resistance in terms of Landauer type spin dipoles,"We considered the nonequlibrium spin dipoles induced around spin independent
+elastic scatterers by the intrinsic spin-Hall effect associated with the Rashba
+spin-orbit coupling. The normal to 2DEG spin polarization has been calculated
+in the diffusion range around the scatterer. We found that although around each
+impurity this polarization is finite, the corresponding macroscopic spin
+density, obtained via averaging of individual spin dipole distributions over
+impurity positions is zero in the bulk. At the same time, the spin density is
+finite near the boundary of 2DEG, except for a special case of a hard wall
+boundary. The boundary value of the spin polarization can be associated with
+the interface spin-Hall resistance determining the additional energy
+dissipation due to spin accumulation.",0610423v2
+2013-05-18,Spin force and the generation of sustained spin current in time-dependent Rashba and Dresselhauss systems,"The generation of spin current and spin polarization in a 2DEG structure is
+studied in the presence of Dresselhaus and Rashba spin-orbit couplings (SOC),
+the strength of the latter being modulated in time by an ac gate voltage. By
+means of the non-Abelian gauge field approach, we established the relation
+between the Lorentz spin force and the spin current in the SOC system, and
+showed that the longitudinal component of the spin force induces a transverse
+spin current. For a constant (time-invariant) Rashba system, we recover the
+universal spin Hall conductivity of $\frac e{8\pi}$, derived previously via the
+Berry phase and semiclassical methods. In the case of a time-dependent SOC
+system, the spin current is sustained even under strong impurity scattering. We
+evaluated the ac spin current generated by a time-modulated Rashba SOC in the
+absence of any dc electric field. The magnitude of the spin current reaches a
+maximum when the modulation frequency matches the Larmor frequency of the
+electrons.",1305.4221v1
+2016-03-21,Rashba semiconductor as spin Hall material: Experimental demonstration of spin pumping in wurtzite $n$-GaN:Si,"Pure spin currents in semiconductors are essential for implementation in the
+next generation of spintronic elements. Heterostructures of III- nitride
+semiconductors are currently employed as central building-blocks for lighting
+and high-power devices. Moreover, the long relaxation times and the spin-orbit
+coupling (SOC) in these materials indicate them as privileged hosts for spin
+currents and related phenomena. Spin pumping is an efficient mechanism for the
+inception of spin current and its conversion into charge current in
+non-magnetic metals and semiconductors with Rashba SOC $via$ spin Hall effects.
+We report on the generation in $n$-GaN:Si\,--\,at room temperature and through
+spin pumping\,--\,of pure spin current, fundamental for the understanding of
+the spin dynamics in these non-centrosymmetric Rashba systems. We find for
+$n$-GaN:Si a spin Hall angle $\theta_{\mathrm{SH}}$=$3.03\times10^{-3}$,
+exceeding by one order of magnitude those reported for other semiconductors,
+pointing at III-nitrides as particularly efficient spin current generators.",1603.06471v1
+2017-01-26,Wurtzite spin lasers,"Semiconductor lasers are strongly altered by adding spin-polarized carriers.
+Such spin lasers could overcome many limitations of their conventional
+(spin-unpolarized) counterparts. While the vast majority of experiments in spin
+lasers employed zinc-blende semiconductors, the room temperature electrical
+manipulation was first demonstrated in wurtzite GaN-based lasers. However, the
+underlying theoretical description of wurtzite spin lasers is still missing. To
+address this situation, focusing on (In,Ga)N-based wurtzite quantum wells, we
+develop a theoretical framework in which the calculated microscopic
+spin-dependent gain is combined with a simple rate equation model. A small
+spin-orbit coupling in these wurtzites supports simultaneous spin polarizations
+of electrons and holes, providing unexplored opportunities to control spin
+lasers. For example, the gain asymmetry, as one of the key figures of merit
+related to spin amplification, can change the sign by simply increasing the
+carrier density. The lasing threshold reduction has a nonmonotonic depenedence
+on electron spin polarization, even for a nonvanishing hole spin polarization.",1701.07793v1
+2020-06-02,Spin pumping and inverse spin Hall effect in iridium oxide,"Large charge-to-spin conversion (spin Hall angle) and spin Hall conductivity
+are prerequisites for development of next generation power efficient spintronic
+devices. In this context, heavy metals (e.g. Pt, W etc.), topological
+insulators, antiferromagnets are usually considered because they exhibit high
+spin-orbit coupling (SOC). In addition to the above materials, 5d transition
+metal oxide e.g. Iridium Oxide (IrO 2 ) is a potential candidate which exhibits
+high SOC strength. Here we report a study of spin pumping and inverse spin Hall
+effect (ISHE), via ferromagnetic resonance (FMR), in IrO 2 /CoFeB system. We
+identify the individual contribution of spin pumping and other spin
+rectification effects in the magnetic layer, by investigating the in-plane
+angular dependence of ISHE signal. Our analysis shows significant contribution
+of spin pumping effect to the ISHE signal. We show that polycrystalline IrO 2
+thin film exhibits high spin Hall conductivity and spin Hall angle which are
+comparable to the values of Pt.",2006.01865v2
+2023-09-20,Giant interfacial spin-Hall angle from Rashba-Edelstein effect revealed by the spin-Hall Hanle processes,"The Rashba-Edelstein effect (REE), which generates interfacial spin
+polarization and subsequent spin current, is a compelling spin-charge
+conversion mechanism for spintronics applications, since it is not limited by
+the elemental spin-orbit coupling. In this work, we demonstrate REE at
+Pt/ferroelectric interfaces using the recently elucidated spin-Hall Hanle
+effects (SHHE), in which a Larmor precession of spin polarization in a
+diffusion process from the interface manifest as magnetoresistance and Hall
+effect. We show that REE leads to a three-fold enhancement of the effective
+spin Hall angle in ferroelectric interface Pt/h-LuFeO3 compared to that of Pt
+/Al2O3, although the difference in the spin relaxation time is negligible.
+Modeling using SHHEs involving REE as an additional source of interfacial
+polarization suggests that REE can lead to an interfacial spin Hall angle
+(~0.3) that is one order of magnitude larger than the bulk value of Pt. Our
+results demonstrate that a ferroelectric interface can produce large
+spin-charge conversion and that SHHEs are a sensitive tool for characterizing
+interfacial spin transport properties.",2309.10985v1
+2010-07-06,Radial Spin Helix in Two-Dimensional Electron Systems with Rashba Spin-Orbit Coupling,"We suggest a long-lived spin polarization structure, a radial spin helix, and
+study its relaxation dynamics. For this purpose, starting with a simple and
+physically clear consideration of spin transport, we derive a system of
+equations for spin polarization density and find its general solution in the
+axially symmetric case. It is demonstrated that the radial spin helix of a
+certain period relaxes slower than homogeneous spin polarization and plain spin
+helix. Importantly, the spin polarization at the center of the radial spin
+helix stays almost unchanged at short times. At longer times, when the initial
+non-exponential relaxation region ends, the relaxation of the radial spin helix
+occurs with the same time constant as that describing the relaxation of the
+plain spin helix.",1007.0853v1
+2020-01-23,Universal intrinsic higher-rank spin Hall effect,"Spin Hall effect (SHE), a fundamental transport phenomenon with non-zero spin
+current but vanishing charge current, has important applications in spintronics
+for the electrical control of spins. Owing to the half-spin nature of
+electrons, the rank of spin current (determined by the rank of spin tensors)
+has been restricted to 0 and 1 for charge and spin Hall effects. Motivated by
+recent studies of pseudospin-1 fermions in solid state and cold atomic systems,
+here we introduce and characterize higher-rank ($\geq 2$) SHEs in large spin
+($\geq 1$) systems. We find a universal rank-2 spin Hall conductivity $e/{8}\pi
+$, with zero rank-0 and 1 conductivities, for a spin-1 model with intrinsic
+spin-orbit coupling. Similar rank-2 SHEs can also be found in a spin-3/2
+system. An experimental scheme is proposed to realize and measure rank-2 SHEs
+with pseudospin-1 ultracold fermionic atoms. Our results reveal novel spin
+transport phenomena in large spin systems and may find important applications
+in designing innovative spintronic devices.",2001.08675v2
+2000-11-01,"Magnetism, Spin-Orbit Coupling, and Superconducting Pairing in UGe$_2$","A consistent picture on the mean-field level of the magnetic properties and
+electronic structure of the superconducting itinerant ferromagnet UGe$_2$ is
+shown to require inclusion of correlation effects beyond the local density
+approximation (LDA). The ""LDA+U"" approach reproduces both the magnitude of the
+observed moment, composed of strongly opposing spin and orbital parts, and the
+magnetocrystalline anisotropy. The largest Fermi surface sheet is comprised
+primarily of spin majority states with orbital projection $m_{\ell}$=0,
+suggesting a much simpler picture of the pairing than is possible for general
+strong spin-orbit coupled materials. This occurrence, and the
+quasi-two-dimensional geometry of the Fermi surface, support the likelihood of
+magnetically mediated p-wave triplet pairing.",0011026v1
+2002-04-12,Spin-orbit scattering effect on critical current in SFIFS tunnel structures,"The spin-orbit scattering effect on critical current through
+superconductor/ferromagnet (SF) bilayers separated by an insulator (SFIFS
+tunnel junction) have been investigated for the case of absence of the
+superconducting order parameter oscillations (thin F layers). The analysis is
+based on a microscopic theory for proximity coupled SF bilayer for different
+bilayer parameters (boundary transparency, proximity effect strength, relative
+orientation and value of the F layers exchange field). We find that the
+spin-orbit scattering considerably modifies dc Josephson current in SFIFS
+tunnel junction. In contrast to a simple physical picture, the reduction of the
+exchange field effects is nonlinear in character getting its maximum in the
+field's region where the critical current enhancement or the transition to the
+\pi-state take place. Hence, for understanding the various experimental results
+on tunnel structures with thin F layers, the coupled effects of the exchange
+interaction and spin-orbit scattering must be considered.",0204273v1
+2003-09-30,Effect of one-ion L-S coupling on magnetic properties of a correlated spin-orbit system,"By introducing a basis for a novel realization of the SU(4) Lie algebra, we
+exactly solve a spin-orbital chain with one-ion $L$-$S$ coupling (OILSC) via
+the Bethe ansatz (BA) approach. In the context of different Land\'e $g$ factors
+of the spin and orbital sectors, the OILSC results in rich and novel quantum
+phase transitions. Some accurate analytical expressions for the critical fields
+are obtained. Both spin ordering and orbital ordering are found in a gapped
+singlet phase. The system exhibits many interesting phenomena such as
+nonvanishing magnetization of the singlet phase, multi-entrance of the singlet
+in the ground state when the field varies, unsymmetric magnetization in
+two-component phase and magnetization crossover for different OILSC.",0309718v1
+2004-07-30,Spin-orbit coupling in nuclei and realistic nucleon-nucleon potentials,"We analyze the spin-orbit coupling term in the nuclear energy density
+functional in terms of a zero-range NN-contact interaction and finite-range
+contributions from two-pion exchange. We show that the strength of the
+spin-orbit contact interaction as extracted from high-precision nucleon-nucleon
+potentials is in perfect agreement with that of phenomenological Skyrme forces
+employed in non-relativistic nuclear structure calculations. Additional
+long-range contributions from chiral two-pion exchange turn out to be
+relatively small. These explicitly density-dependent contributions reduce the
+ratio of the isovector to the isoscalar spin-orbit strength significantly below
+the Skyrme value 1/3. We perform a similar analysis for the strength function
+of the $(\vec \nabla \rho)^2$-term and find values not far from those of
+phenomenological Skyrme parameterizations.",0407116v1
+2007-04-20,Application of energy and angular momentum balance to gravitational radiation reaction for binary systems with spin-orbit coupling,"We study gravitational radiation reaction in the equations of motion for
+binary systems with spin-orbit coupling, at order (v/c)^7 beyond Newtonian
+gravity, or O(v/c)^2 beyond the leading radiation reaction effects for
+non-spinning bodies. We use expressions for the energy and angular momentum
+flux at infinity that include spin-orbit corrections, together with an
+assumption of energy and angular momentum balance, to derive equations of
+motion that are valid for general orbits and for a class of coordinate gauges.
+We show that the equations of motion are compatible with those derived earlier
+by a direct calculation.",0704.2720v1
+2009-09-17,Enhanced Rashba effect for hole states in a quantum dot,"The effect of Rashba spin-orbit (SO) interaction on the hole states in a
+quantum dot is studied in the presence of an external magnetic field. We
+demonstrate here that the Rashba SO coupling has a profound effect on the
+energy spectrum of the holes revealing level repulsions between the states with
+the same total momentum. We also show that the resulting spin-orbit gap is much
+larger than the corresponding one for the electron energy levels in a quantum
+dot. Inter-hole interactions only marginally reduce the spin-orbit gap. This
+enhanced Rashba effect would manifest itself in the tuneling current which
+depends on the spin-orbit coupling strength.",0909.3318v2
+2010-09-17,Microscopic study of spin-orbit-induced Mott insulator in Ir oxides,"Motivated by recent experiments of a novel 5$d$ Mott insulator in
+Sr$_2$IrO$_4$, we have studied the two-dimensional three-orbital Hubbard model
+with a spin-orbit coupling $\lambda$. The variational Monte Carlo method is
+used to obtain the ground state phase diagram with varying a on-site Coulomb
+interaction $U$ as well as $\lambda$. It is found that the transition from a
+paramagnetic metal to an antiferromagnetic (AF) insulator occurs at a finite
+$U=U_{\mathrm{MI}}$, which is greatly reduced by a large $\lambda$,
+characteristic of 5$d$ electrons, and leads to the ""spin-orbit-induced"" Mott
+insulator. It is also found that the Hund's coupling induces the anisotropic
+spin exchange and stabilizes the in-plane AF order. We have further studied the
+one-particle excitations using the variational cluster approximation, and
+revealed the internal electronic structure of this novel Mott insulator. These
+findings are in agreement with experimental observations on Sr$_2$IrO$_4$, and
+qualitatively different from those of extensively studied 3$d$ Mott insulators.",1009.3311v2
+2011-02-04,Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field,"Using an exact diagonalization approach we show that one- and two-electron
+InAs quantum dots exhibit avoided crossing in the energy spectra that are
+induced by the spin-orbit coupling in the presence of an in-plane external
+magnetic field. The width of the avoided crossings depends strongly on the
+orientation of the magnetic field which reveals the intrinsic anisotropy of the
+spin-orbit coupling interactions. We find that for specific orientations of the
+magnetic field avoided crossings vanish. Value of this orientation can be used
+to extract the ratio of the strength of Rashba and Dresselhaus interactions.
+The spin-orbit anisotropy effects for various geometries and orientations of
+the confinement potential are discussed. Our analysis explains the physics
+behind the recent measurements performed on a gated self-assembled quantum dot
+[S. Takahashi et al. Phys. Rev. Lett. 104, 246801 (2010)].",1102.1002v2
+2011-08-23,Resonant X-Ray Diffraction Study of Strongly Spin-Orbit-Coupled Mott Insulator CaIrO3,"We performed resonant x-ray diffraction experiments at the $L$ absorption
+edges for the post-perovskite-type compound CaIrO$_{3}$ with $(t_{2g})^5$
+electronic configuration. By observing the magnetic signals, we could clearly
+see that the magnetic structure was a striped order with an antiferromagnetic
+moment along the c-axis and that the wavefunction of a $t_{2g}$ hole is
+strongly spin-orbit entangled, the $J_{\rm eff} =1/2$ state. The observed spin
+arrangement is consistent with theoretical work predicting a unique
+superexchange interaction in the $J_{\rm eff} =1/2$ state and points to the
+universal importance of the spin-orbit coupling in Ir oxides, irrespective of
+the local coordination and lattice topology. We also propose that the
+non-magnetic resonant scattering is a powerful tool for unraveling an orbital
+state even in a metallic iridate.",1108.4523v1
+2011-10-04,Two-orbital quantum spin model of magnetism in the iron pnictides,"We study a two-orbital spin model to describe (pi,0) stripe
+antiferromagnetism in the iron pnictides. The ""double-spin"" model has an
+on-site Hunds's coupling and inter-site interactions extending to second
+neighbors (inter- and intra-orbital) on the square lattice. Using a variational
+method based on a cluster decomposition, we optimize wave functions with up to
+8 cluster sites (up to 2^16 variational parameters). We focus on the
+anomalously small ordered moments in the stripe state of the pnictides. To
+account for it, and large variations among different compounds, we show that
+the second-neighbor cross-orbital exchange constant should be ferromagnetic,
+which leads to ""partially hidden"" stripe order, with a moment that can be
+varied over a large range by small changes in the coupling constants. In a
+different parameter region, we confirm the existence of a canted state
+previously found in spin-wave theory. We also identify several other phases of
+the model.",1110.0761v2
+2012-03-09,Two-dimensional Heisenberg behavior of Jeff = 1/2 isospins in the paramagnetic state of spin-orbital Mott insulator Sr2IrO4,"Dynamical correlations of Jeff = 1/2 isospins in the paramagnetic state of
+spin-orbital Mott insu- lator Sr2IrO4 was revealed by resonant magnetic x-ray
+diffuse scattering. We found two-dimensional antiferromagnetic fluctuation with
+a large in-plane correlation length exceeding 100 lattice spacings at even 20 K
+above the mangnetic ordering temperature. In marked contrast to the naive
+expecta- tion of strong magnetic anisotropy associated with an enhanced
+spin-orbit coupling, we discovered isotropic isospin correlation that is well
+described by the two-dimensional S = 1/2 quantum Heisen- berg model. The
+estimated antiferromagnetic coupling constant as large as J ~ 0.1 eV that is
+comparable to the small Mott gap (< 0.5 eV) points the weak and marginal Mott
+character of this spin-orbital entangled system.",1203.1983v1
+2012-07-26,Magnetoelectric effects in superconducting nanowires with Rashba spin-orbit coupling,"Recent experiments in semiconductor nanowires with a spin-orbit coupling and
+proximity-induced superconductivity exhibit signatures of Majorana bound states
+predicted to exist in the topological phase. In this work we predict that these
+nanowire systems exhibit unconventional magnetoelectric effects showing a sharp
+crossover behavior at the topological phase transition. We find that magnetic
+fields with a component parallel to the spin-orbit field can give rise to
+currents in equilibrium. Surprisingly, also fields perpendicular to the
+spin-orbit field may induce currents and can be employed in adiabatic charge
+pumping. The perpendicular field magnetoelectric effect may be regarded as a
+manifestation of the anomalous Hall effect in one dimension. We discuss how the
+predicted phenomena could be observed in experiments and employed in probing
+the topological phase transition.",1207.6311v1
+2013-12-28,"Impact of spin-orbit coupling on the magnetism of Sr3MIrO6 (M = Ni, Co)","Using density functional calculations, we demonstrate that the spin-orbit
+coupling (SOC) of the Ir4+ ion plays an essential role in determining the
+antiferromagnetism of the hexagonal spin-chain system Sr3MIrO6 (M = Ni, Co) by
+tuning the crystal-field level sequence and altering the Ir-M inter-orbital
+interactions. The SOC splits the e'_{g} doublet of the octahedral Ir4+ ion
+(t_{2g}^5) in a trigonal crystal field, and the single t_{2g} hole resides on
+the e'_{g} upper branch and gives rise to the antiferromagnetic superexchange.
+In absence of the SOC, however, the single t_{2g} hole would occupy the a_{1g}
+singlet instead, which would mediate an unreal ferromagnetic exchange due to a
+direct a_{1g} hopping along the Ir-M chain. We also find that the Ni2+ and Co2+
+ions are both in a high-spin state and moreover the Co2+ ion carries a huge
+orbital moment. This work well accounts for the recent experiments and
+magnifies again the significance of the SOC in iridates.",1312.7411v1
+2015-04-07,Fractal butterflies in buckled graphene-like materials,"We study theoretically the properties of buckled graphene-like materials,
+such as silicene and germanene, in a strong perpendicular magnetic field and a
+periodic potential. We analyze how the spin-orbit interaction and the
+perpendicular electric field influences the energy spectra of these systems.
+When the magnetic flux through a unit cell of the periodic potential measured
+in magnetic flux quantum is a rational number, ? = p/q, then in each Landau
+level the energy spectra have a band structure, which is characterized by the
+corresponding gaps. We study the dependence of those gaps on the parameters of
+the buckled graphene-like materials. Although some gaps have weak dependence on
+the magnitude of the spin-orbit coupling and the external electric field, there
+are gaps that show strong nonomonotic dependence on these parameters. For ? =
+1/2, the spin-orbit interaction also opens up a gap at one of the Landau
+levels. The magnitude of the gap increases with spin-orbit coupling and
+decreases with the applied electric field.",1504.01749v1
+2015-08-06,Odd-parity superconductivity by competing spin-orbit coupling and orbital effect in artificial heterostructures,"We show that odd-parity superconductivity occurs in multilayer Rashba systems
+without requiring spin-triplet Cooper pairs. A pairing interaction in the
+spin-singlet channel stabilizes the odd-parity pair-density-wave (PDW) state in
+the magnetic field parallel to the two-dimensional conducting plane. It is
+shown that the layer-dependent Rashba spin-orbit coupling and the orbital
+effect play essential roles for the PDW state in binary and tricolor
+heterostructures. We demonstrate that the odd-parity PDW state is a
+symmetry-protected topological superconducting state characterized by the
+one-dimensional winding number in the symmetry class BDI. The superconductivity
+in the artificial heavy-fermion superlattice CeCoIn_5/YbCoIn_5 and bilayer
+interface SrTiO_3/LaAlO_3 is discussed.",1508.01333v2
+2016-07-28,A spin-freezing perspective on cuprates,"The high-temperature superconducting state in cuprates appears if charge
+carriers are doped into a Mott insulating parent compound. An unresolved puzzle
+is the unconventional nature of the normal state above the superconducting
+dome, and its connection to the superconducting instability. At weak
+hole-doping, a ""pseudo-gap"" metal state with signatures of time-reversal
+symmetry breaking is observed, which near optimal doping changes into a
+""strange metal"" with non-Fermi liquid properties. Qualitatively similar phase
+diagrams are found in multi-orbital systems, such as pnictides, where the
+unconventional metal states arise from a Hund coupling induced spin-freezing.
+Here, we show that the relevant model for cuprates, the single-orbital Hubbard
+model on the square lattice, can be mapped onto an effective multi-orbital
+problem with strong ferromagnetic Hund coupling. The spin-freezing physics of
+this multi-orbital system explains the phenomenology of cuprates, including the
+pseudo-gap, the strange metal, and the d-wave superconducting instability. Our
+analysis suggests that spin-freezing is the universal mechanism which controls
+the properties of unconventional superconductors.",1607.08573v1
+2014-03-05,Statistical properties of spectra in harmonically trapped spin-orbit coupled systems,"We compute single-particle energy spectra for a one-body hamiltonian
+consisting of a two-dimensional deformed harmonic oscillator potential, the
+Rashba spin-orbit coupling and the Zeeman term. To investigate the statistical
+properties of the obtained spectra as functions of deformation, spin-orbit and
+Zeeman strengths we examine the distributions of the nearest neighbor spacings.
+We find that the shapes of these distributions depend strongly on the three
+potential parameters. We show that the obtained shapes in some cases can be
+well approximated with the standard Poisson, Brody and Wigner distributions.
+The Brody and Wigner distributions characterize irregular motion and help
+identify quantum chaotic systems. We present a special choices of deformation
+and spin-orbit strengths without the Zeeman term which provide a fair
+reproduction of the fourth-power repelling Wigner distribution. By adding the
+Zeeman field we can reproduce a Brody distribution, which is known to describe
+a transition between the Poisson and linear Wigner distributions.",1403.1205v2
+2013-09-09,Wigner crystal of a two-dimensional electron gas with a strong spin-orbit interaction,"The Wigner-crystal phase of two-dimensional electrons interacting via the
+Coulomb repulsion and subject to a strong Rashba spin-orbit coupling is
+investigated. For low enough electronic densities the spin-orbit band splitting
+can be larger than the zero-point energy of the lattice vibrations. Then the
+degeneracy of the lower subband results in a spontaneous symmetry breaking of
+the vibrational ground state. The $60^{\circ}-$rotational symmetry of the
+triangular (spin-orbit coupling free) structure is lost, and the unit cell of
+the new lattice contains two electrons. Breaking the rotational symmetry also
+leads to a (slight) squeezing of the underlying triangular lattice.",1309.2307v2
+2016-08-24,Anisotropic spin fluctuations in Sr$_2$RuO$_4$: role of spin-orbit coupling and induced strain,"We analyze the spin anisotropy of the magnetic susceptibility of Sr$_2$RuO$4$
+in presence of spin-orbit coupling and anisotropic strain using
+quasi-two-dimensional tight-binding parametrization fitted to the ARPES
+results. Similar to the previous observations we find the in-plane polarization
+of the low ${\bf q}$ magnetic fluctuations and the out-of-plane polarization of
+the incommensurate magnetic fluctuation at the nesting wave vector ${\bf Q}_1 =
+(2/3 \pi ,2/3 \pi)$ but also nearly isotropic fluctuations near ${\bf
+Q}_2=(\pi/6,\pi/6)$. Furthermore, one finds that apart from the high-symmetry
+direction of the tetragonal Brillouin zone the magnetic anisotropy is maximal,
+i.e. $\chi^{xx} \neq \chi^{yy} \neq \chi^{zz}$. This is the consequence of the
+orbital anisotropy of the $xz$ and $yz$ orbitals in the momentum space. We also
+study how the magnetic anisotropy evolves in the presence of the strain and
+find strong Ising-like ferromagnetic fluctuations near the Lifshitz transition
+for the $xy$-band.",1608.06786v1
+2018-10-22,First-principles studies of spin-orbital physics in pyrochlore oxides,"The pyrochlore oxides $A_2B_2$O$_7$ exhibit a complex interplay between
+geometrical frustration, electronic correlations, and spin-orbit coupling, due
+to the lattice structure and active charge, spin, and orbital degrees of
+freedom. Understanding the properties of these materials is a theoretical
+chalenge, because their intricate nature depends on material-specific details
+and quantum many-body effects. Here we review our recent studies based on
+first-principles calculations and quantum many-body theories for 4$d$ and 5$d$
+pyrochlore oxides with $B$=Mo, Os, and Ir. In these studies, the spin-orbit
+coupling and local electron correlations are treated within the LDA+$U$ and
+LDA+dynamical mean-field theory formalisms. We also discuss the technical
+aspects of these calculations.",1810.09596v2
+2019-09-05,Spin-orbit related power-law dependence of the diffusive conductivity on the carrier density in disordered Rashba two-dimensional electron systems,"By using the momentum-space Lanczos recursive method which considers
+rigorously all multiple-scattering events, we unveil that the non-perturbative
+disorder effect has dramatic impact on the charge transport of a
+two-dimensional electron system with Rashba spin-orbit coupling in the
+low-density region. Our simulations find a power-law dependence of the dc
+longitudinal conductivity on the carrier density, with the exponent linearly
+dependent on the Rashba spin-orbit strength but independent of the disorder
+strength. Therefore, the classical charge transport influenced by complicated
+multiple-scattering processes also shows the characteristic feature of the
+spin-orbit coupling. This highly unconventional behavior is argued to be
+observable in systems with tunable carrier density and Rashba splitting, such
+as the LaAlO$_{3}$/SrTiO$_{3}$ interface, the heterostructure of Rashba
+semiconductors bismuth tellurohalides and the surface alloy
+Bi$_x$Pb$_y$Sb$_{1-x-y}$/Ag(111).",1909.02186v3
+2019-10-06,Spin-orbit coupling effects on the electronic properties of the pressure-induced superconductor CrAs,"We present the effects of spin-orbit coupling on the low-energy bands and
+Fermi surface of the recently discovered pressure-induced superconductor CrAs.
+We apply the L\""owdin down-folding procedure to a tight-binding hamiltonian
+that includes the intrinsic spin-orbit interaction, originating from the Cr 3d
+electrons as well as from As 4p ones. Our results indicate that As
+contributions have negligible effects, whereas the modifications to the band
+structure and the Fermi surface can be mainly ascribed to the Cr contribution.
+We show that the inclusion of the spin-orbit interaction allows for a selective
+removal of the band degeneracy due to the crystal symmetries, along specific
+high symmetry lines. Such release of the band degeneracy naturally determines a
+reconstruction of the Fermi surface, including the possibility of changing the
+number of pockets.",1910.02407v1
+2020-04-09,First-Principles Calculation of Spin and Orbital Contributions to Magnetically Ordered Moments in Sr$_{2}$IrO$_{4}$,"We show how an accurate first-principles treatment of the
+canted-antiferromagnetic ground state of Sr$_2$IrO$_4$, a prototypical $5d$
+correlated spin-orbit coupled material, can be obtained without invoking any
+free parameters such as the Hubbard U or tuning the spin-orbit coupling
+strength. Our theoretically predicted iridium magnetic moment of 0.250 $\mu_B$,
+canted by 12.6$^{\circ}$ off the a-axis, is in accord with experimental
+results. By resolving the magnetic moments into their spin and orbital
+components, we show that our theoretically obtained variation of the magnetic
+scattering amplitude $<M_{m}>$ as a function of the polarization angle is
+consistent with recent non-resonant magnetic x-ray scattering measurements. The
+computed value of the band gap (55 meV) is also in line with the corresponding
+experimental values. A comparison of the band structure to that of the cuprates
+suggests the presence of incommensurate charge-density wave phases in
+Sr$_{2}$IrO$_{4}$.",2004.04759v1
+2019-03-15,Type-II Ising superconductivity in two-dimensional materials with strong spin-orbit coupling,"Recent discovery of Ising superconductivity protected against in-plane
+magnetic field by spin-orbit coupling (SOC) has stimulated intensive research
+interests. The effect, however, was only expected to appear in two-dimensional
+(2D) noncentrosymmetric materials with spin-valley locking. In this work, we
+proposed a new type of Ising superconductivity in 2D materials with $C_{nz}$
+rotational symmetry ($n=3,4,6$). This mechanism, dubbed as type-II Ising
+superconductivity, is applicable for centrosymmetric materials. Type-II Ising
+superconductivity relies on the SOC-induced spin-orbital locking characterized
+by Ising-type Zeeman-like fields displaying opposite signs for opposing
+orbitals. We found that type-II Ising superconductivity are most prominent
+around time-reversal invariant momenta and is not sensitive to inversion
+symmetry breaking. By performing high-throughput first-principles calculations,
+about one hundred candidate materials were identified. Our work significantly
+enriches the physics and materials of Ising superconductor, opening new
+opportunities for fundamental research and practical applications of 2D
+materials.",1903.06660v3
+2020-11-04,Level attraction and exceptional points in a resonant spin-orbit torque system,"Level attraction can appear in driven systems where instead of repulsion two
+modes coalesce in a region separated by two exceptional points. This behavior
+was proposed for optomechanical and optomagnonic systems, and recently observed
+for dissipative cavity magnon-polaritons. We demonstrate that such a regime
+exists in a spin-orbit torque system where a magnetic oscillator is resonantly
+coupled to an electron reservoir. An instability mechanism necessary for mode
+attraction can be provided by applying an electric field. The field excites
+interband transitions between spin-orbit split bands leading to an instability
+of the magnetic oscillator. Two exceptional points then appear in the
+oscillator energy spectrum and the region of instability. We discuss conditions
+under which this can occur and estimate the electric field strength necessary
+for reaching the attraction region for a spin-orbit torque oscillator with
+Rashba coupling. A proposal for experimental detection is made using magnetic
+susceptibility measurements.",2011.02520v1
+2021-03-23,GRIT: a package for structure-preserving simulations of gravitationally interacting rigid-bodies,"Spin-orbit coupling of planetary systems plays an important role in the
+dynamics and habitability of planets. However, symplectic integrators that can
+accurately simulate not only how orbit affects spin but also how spin affects
+orbit have not been constructed for general systems. Thus, we develop
+symplectic Lie-group integrators to simulate systems consisting gravitationally
+interacting rigid bodies. A user friendly package (GRIT
+\url{https://github.com/GRIT-RBSim/GRIT}) is provided and external forcings
+such as tidal interactions are also included. As a demonstration, this package
+is applied to Trappist-I. It shows that the differences in transit timing
+variations due to spin-orbit coupling could reach a few min in ten year
+measurements, and strong planetary perturbations can push Trappist-I f, g and h
+out of the synchronized states.",2103.12767v2
+2021-07-18,Statistical correlation between quantum entanglement and spin-orbit coupling in crossed beam molecular dynamics,"Non-classical features like interference is already being harnessed to
+control the output of chemical reactions. However quantum entanglement which is
+an equally enigmatic many-body quantum correlation can also be used as a
+powerful resource yet have eluded explicit attention. In this report, we
+propose an experimental scheme under the crossed beam molecular dynamical
+setup, with the F+HD reaction, aiming to study the possible influence of
+entanglement within reactant pairs on the angular features of the product
+distribution. The aforesaid reaction has garnered interest recently as an
+unusual horseshoe shape pattern in the product (HF) distribution was observed,
+which has been attributed to the coupling of spin and orbital degrees of
+freedom. We propose an experimental scheme aiming to study the possible
+influence of entanglement on the necessity for the inclusion of such spin-orbit
+characteristics, under circumstances wherein the existence of entanglement and
+spin-orbit interaction is simultaneously detectable. We further numerically
+simulate the attainable results highlighting specific patterns corresponding to
+various possibilities. Such studies if extended can provide unforeseen
+mechanistic insight in analogous reactions too from the lens of quantum
+information.",2107.08483v1
+2022-01-21,Frequency-dependent Inter-pseudospin Solutions to Superconducting Strontium Ruthenate,"The lasting puzzle of the superconducting order parameter of Sr$_2$RuO$_4$
+calls for theoretical studies that include seldom-considered effects. Here we
+include spin-orbit coupling effects on the electronic structure and then solve
+the linearized Eliashberg equation in a pseudospin basis, including the
+possibility that spin and charge fluctuations induce frequency-dependent
+superconducting order parameters. We find that spin-orbit coupling mixes even
+and odd contributions in orbital, spin and frequency spaces and that leading
+inter-pseudospin symmetries, B$_{1g}^+$ and A$_{2g}^-$, have intra-orbital
+components respectively even and odd in Matsubara frequency. An accidental
+degeneracy between these could resolve apparent experimental contradictions.",2201.08917v2
+2022-04-29,Rydberg Atomic Antenna in Strongly Driven Multi-Electron Atoms,"We study the role of intermediate excitations of Rydberg states as an example
+of Kuchiev's ""atomic antenna"" in above-threshold ionization of xenon, in
+particular their effect on the coherence between the spin-orbit-split states of
+the ion. We focus on the case of a laser frequency close to resonant with the
+spin-orbit splitting, where a symmetry (parity) argument would preclude any
+coherence being directly generated by strong-field ionization. Using ab initio
+simulations of coupled multielectron spin-orbit dynamics in strong laser
+fields, we show how field-driven rescattering of the trapped Rydberg electrons
+introduces efficient coupling between the spin-orbit-split channels, leading to
+substantial coherences, exceeding 10 % for some photon energies.",2204.14082v2
+2022-08-06,Tunable two-dimensional superconductivity and spin-orbit coupling at the EuO/KTaO3(110) interface,"Unconventional quantum states, most notably the two-dimensional (2D)
+superconductivity, have been realized at the interfaces of oxide
+heterostructures where they can be effectively tuned by the gate voltage
+($V_G$). Here we report that the interface between high-quality EuO (111) thin
+film and KTaO3 (KTO) (110) substrate shows superconductivity with onset
+transition temperature $T_c^{onset}$ = 1.35 K. The 2D nature of
+superconductivity is verified by the large anisotropy of the upper critical
+field and the characteristics of a Berezinskii-Kosterlitz-Thouless transition.
+By applying $V_G$, $T_c^{onset}$ can be tuned from ~ 1 to 1.7 K; such an
+enhancement can be possibly associated with a boosted spin-orbit energy
+${\epsilon}_{so}$ = $\hbar$ / ${\tau}_{so}$, where ${\tau}_{so}$ is the
+spin-orbit relaxation time. Further analysis of ${\tau}_{so}$ based on the
+upper critical field ($H_{c2}$) and magnetoconductance reveals complex nature
+of spin-orbit coupling (SOC) at the EuO/KTO(110) interface with different
+mechanisms dominate the influence of SOC effects for the superconductivity and
+the magnetotransport in the normal state. Our results demonstrate that the SOC
+should be considered as an important factor determining the 2D
+superconductivity at oxide interfaces.",2208.03507v1
+2022-09-06,High-spin orbital interactions across van der Waals gaps controlling the interlayer ferromagnetism in van der Waals ferromagnets,"We examined what interactions control the sign and strength of the interlayer
+coupling in van der Waals ferromagnets such as Fe3-xGeTe2, Cr2Ge2Te6, CrI3 and
+VI3, to find that high-spin orbital interaction across the van der Waals gaps
+are a key to understanding their ferromagnetism. Interlayer ferromagnetic
+coupling in Fe3-xGeTe2 Cr2Ge2Te6, and CrI3 is governed by the high-spin
+two-orbital two-electron destabilization, but that in VI3 by the high-spin
+four-orbital two-electron stabilization. These interactions explain a number of
+seemingly puzzling observations in van der Waals fer-romagnets.",2209.02233v1
+2023-07-29,Swapping exchange and spin-orbit induced correlated phases in ex-so-tic van der Waals heterostructures,"Ex-so-tic van der Waals heterostructures take advantage of the electrically
+tunable layer polarization to swap proximity exchange and spin-orbit coupling
+in the electronically active region. Perhaps the simplest example is Bernal
+bilayer graphene (BBG) encapsulated by a layered magnet from one side and a
+strong spin-orbit material from the other. Taking WS$_2$/BBG/Cr$_2$Ge$_2$Te$_6$
+as a representative ex-so-tronic device, we employ realistic \emph{ab
+initio}-inspired Hamiltonians and effective electron-electron interactions to
+investigate the emergence of correlated phases within the random phase
+approximation. We find that for a given doping level, exchange and spin-orbit
+coupling induced Stoner and intervalley coherence instabilities can be swapped,
+allowing to explore the full spectrum of correlated phases within a single
+device.",2307.16025v1
+2023-10-10,Non-relativistic torque and Edelstein effect in noncollinear magnets,"The Edelstein effect is the origin of the spin-orbit torque: a
+current-induced torque that is used for the electrical control of ferromagnetic
+and antiferromagnetic materials. This effect originates from the relativistic
+spin-orbit coupling, which necessitates utilizing materials with heavy
+elements. Here we show that in magnetic materials with non-collinear magnetic
+order, the Edelstein effect and consequently also a current-induced torque can
+exist even in the absence of the spin-orbit coupling. Using group symmetry
+analysis, model calculations, and realistic simulations on selected compounds,
+we identify large classes of non-collinear magnet candidates and demonstrate
+that the current-driven torque is of similar magnitude as the celebrated
+spin-orbit torque in conventional transition metal structures. We also show
+that this torque can exist in an insulating material, which could allow for
+highly efficient electrical control of magnetic order.",2310.06499v1
+2007-08-15,Spin dynamics in InAs-nanowire quantum-dots coupled to a transmission line,"We study theoretically electron spins in nanowire quantum dots placed inside
+a transmission line resonator. Because of the spin-orbit interaction, the spins
+couple to the electric component of the resonator electromagnetic field and
+enable coherent manipulation, storage, and read-out of quantum information in
+an all-electrical fashion. Coupling between distant quantum-dot spins, in one
+and the same or different nanowires, can be efficiently performed via the
+resonator mode either in real time or through virtual processes. For the latter
+case we derive an effective spin-entangling interaction and suggest means to
+turn it on and off. We consider both transverse and longitudinal types of
+nanowire quantum-dots and compare their manipulation timescales against the
+spin relaxation times. For this, we evaluate the rates for spin relaxation
+induced by the nanowire vibrations (phonons) and show that, as a result of
+phonon confinement in the nanowire, this rate is a strongly varying function of
+the spin operation frequency and thus can be drastically reduced compared to
+lateral quantum dots in GaAs. Our scheme is a step forward to the formation of
+hybrid structures where qubits of different nature can be integrated in a
+single device.",0708.2091v1
+2007-08-23,Control of spin coherence in semiconductor double quantum dots,"We propose a scheme to manipulate the spin coherence in vertically coupled
+GaAs double quantum dots. Up to {\em ten} orders of magnitude variation of the
+spin relaxation and {\em two} orders of magnitude variation of the spin
+dephasing can be achieved by a small gate voltage applied vertically on the
+double dot. Specially, large variation of spin relaxation still exists at 0 K.
+In the calculation, the equation-of-motion approach is applied to obtain the
+electron decoherence time and all the relevant spin decoherence mechanisms,
+such as the spin-orbit coupling together with the electron--bulk-phonon
+scattering, the direct spin-phonon coupling due to the phonon-induced strain,
+the hyperfine interaction and the second-order process of electron-phonon
+scattering combined with the hyperfine interaction, are included. The condition
+to obtain the large variations of spin coherence is also addressed.",0708.3125v2
+2014-09-09,Electron-spin dynamics in elliptically polarized light waves,"We investigate the coupling of the spin angular momentum of light beams with
+elliptical polarization to the spin degree of freedom of free electrons. It is
+shown that this coupling, which is of similar origin as the well-known
+spin-orbit coupling, can lead to spin precession. The spin-precession frequency
+is proportional to the product of the laser-field's intensity and its spin
+density. The electron-spin dynamics is analyzed by employing exact numerical
+methods as well as time-dependent perturbation theory based on the fully
+relativistic Dirac equation and on the nonrelativistic Pauli equation that is
+amended by a relativistic correction that accounts for the light's spin
+density.",1409.2647v2
+2016-04-28,Ballistic Josephson junctions in the presence of generic spin dependent fields,"Ballistic Josephson junctions are studied in the presence of a spin-splitting
+field and spin-orbit coupling. A generic expression for the quasi-classical
+Green's function is obtained and with its help we analyze several aspects of
+the proximity effect between a spin-textured normal metal (N) and singlet
+superconductors (S). In particular, we show that the density of states may show
+a zero-energy peak which is a generic consequence of the spin-dependent
+couplings in heterostructures. In addition we also obtain the spin current and
+the induced magnetic moment in a SNS structure and discuss possible coherent
+manipulation of the magnetization which results from the coupling between the
+superconducting phase and the spin degree of freedom. Our theory predicts a
+spin accumulation at the S/N interfaces, and transverse spin currents flowing
+perpendicular to the junction interfaces. Some of these findings can be
+understood in the light of a non-Abelian electrostatics.",1604.08455v2
+2008-07-16,Theory of electric dipole spin resonance in quantum dots: Mean field theory with Gaussian fluctuations and beyond,"Very recently, the electric dipole spin resonance (EDSR) of single electrons
+in quantum dots was discovered by three independent experimental groups.
+Remarkably, these observations revealed three different mechanisms of EDSR:
+coupling of electron spin to its momentum (spin-orbit), to the operator of its
+position (inhomogeneous Zeeman coupling), and to the hyperfine Overhauser field
+of nuclear spins. In this paper, I present a unified microscopic theory of
+these resonances in quantum dots. A mean field theory, derived for all three
+mechanisms and based on retaining only two-spin correlators, justifies applying
+macroscopic description of nuclear polarization to the EDSR theory. In the
+framework of the mean field theory, a fundamental difference in the time
+dependence of EDSR inherent of these mechanisms is revealed; it changes from
+the Rabi-type oscillations to a nearly monotonic growth. The theory provides a
+regular procedure to account for the higher nuclear-spin correlators that
+become of importance for a wider time span and can change the asymptotic
+behavior of EDSR. It also allows revealing the effect of electron spin dynamics
+on the effective coupling between nuclear spins.",0807.2624v1
+2017-05-29,Optospintronics in graphene via proximity coupling,"The observation of micron size spin relaxation makes graphene a promising
+material for applications in spintronics requiring long distance spin
+communication. However, spin dependent scatterings at the contact/graphene
+interfaces affect the spin injection efficiencies and hence prevent the
+material from achieving its full potential. While this major issue could be
+eliminated by nondestructive direct optical spin injection schemes, graphenes
+intrinsically low spin orbit coupling strength and optical absorption place an
+obstacle in their realization. We overcome this challenge by creating sharp
+artificial interfaces between graphene and WSe2 monolayers. Application of a
+circularly polarized light activates the spin polarized charge carriers in the
+WSe2 layer due to its spin coupled valley selective absorption. These carriers
+diffuse into the superjacent graphene layer, transport over a 3.5 um distance,
+and are finally detected electrically using BN/Co contacts in a non local
+geometry. Polarization dependent measurements confirm the spin origin of the
+non local signal.",1705.10267v1
+2018-10-15,Ferromagnetic and Antiferromagnetic Coupling of Spin Molecular Interfaces with High Thermal Stability,"We report an advanced organic spin-interface architecture with magnetic
+remanence at room temperature, constituted by metal phthalocyanine molecules
+magnetically coupled with Co layer(s), mediated by graphene. Fe- and
+Cu-phthalocyanines assembled on graphene/Co have identical structural
+configurations, but FePc couples antiferromagnetically with Co up to room
+temperature, while CuPc couples ferromagnetically with weaker coupling and
+thermal stability, as deduced by element-selective X-ray magnetic circular
+dichroic signals. The robust antiferromagnetic coupling is stabilized by a
+superexchange interaction, driven by the out-of-plane molecular orbitals
+responsible of the magnetic ground state and electronically decoupled from the
+underlying metal via the graphene layer, as confirmed by ab initio theoretical
+predictions. These archetypal spin interfaces can be prototypes to demonstrate
+how antiferromagnetic and/or ferromagnetic coupling can be optimized by
+selecting the molecular orbital symmetry.",1810.06317v1
+2021-08-16,Coherently Coupled Mixtures of Bose-Einstein Condensed Gases,"This paper summarizes some of the relevant features exhibited by bi-nary
+mixtures of Bose-Einstein condensates in the presence of coherent coupling at
+zero temperature. The coupling, which is experimentally produced by proper
+photon transitions, can either involve negligible momentum transfer from the
+electromagnetic radiation (Rabi coupling) or large momentum transfer (Raman
+coupling) associated with spin-orbit effects.The nature of the quantum phases
+exhibited by coherently coupled mixtures is discussed in detail, including
+their paramagnetic, ferromagnetic, and, in the case of spin-orbit coupling,
+supersolid phases.The behavior of the corresponding elementary excitations is
+discussed, with explicit emphasis on the novel features caused by the spin-like
+degree of freedom. Focus is further given to the topological excitations
+(solitons, vortices) as well as to the superfluid properties. The paper also
+points out relevant open questions which deserve more systematic theoretical
+and experimental investigations.",2108.10159v1
+2005-05-23,Spin-orbit coupling induced magnetism in the $d$-density wave phase of La$_{2-x}$Ba$_x$CuO$_4$ superconductors,"We study the effects of spin-orbit coupling in the $d$-density wave (DDW)
+phase. In the low-temperature orthorhombic phase of La$_{2-x}$Ba$_x$CuO$_4$, we
+find that spin-orbit coupling induces a ferromagnetic moment in the DDW phase,
+which is polarized along the [110] direction with a considerable magnitude.
+This effect does not exist in the superconducting phase. On the other hand, if
+the $d$-density wave order does not exist at zero field, a magnetic field along
+the [110] direction always induces such a staggered orbital current. We discuss
+experimental constraints on the DDW states in light of our theoretical
+predictions.",0505544v3
+2009-04-21,Band-structure topologies of graphene: spin-orbit coupling effects from first principles,"The electronic band structure of graphene in the presence of spin-orbit
+coupling and transverse electric field is investigated from first principles
+using the linearized augmented plane-wave method. The spin-orbit coupling opens
+a gap at the $K(K')$-point of the magnitude of 24 $\mu$eV (0.28 K). This
+intrinsic splitting comes 96% from the usually neglected $d$ and higher
+orbitals. The electric field induces an additional (extrinsic)
+Bychkov-Rashba-type splitting of 10 $\mu$eV (0.11 K) per V/nm, coming from the
+$\sigma$-$\pi$ mixing. A 'mini-ripple' configuration with every other atom is
+shifted out of the sheet by less than 1% differs little from the intrinsic
+case.",0904.3315v2
+2013-12-10,"Pairing Symmetry, Phase diagram and Edge Modes in Topological Fulde-Ferrell-Larkin-Ovchinnikov Phase","The realizations of spin-orbit coupling in cold atoms lead to a burst of
+research activities in the searching of topological matters in ultracold atom
+systems. The very recent theoretical predictions show that topological
+Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids can be realized with proper
+spin-orbit coupling and Zeeman fields. In this work, a comprehensive
+understanding of the pairing symmetry, phase diagram and the edge modes in this
+new topological matter are presented. The momentum of the Cooper pairs plays
+the role of renormalizing the in-plane Zeeman field and chemical potential. The
+in-plane Zeeman field and finite momentum pairing induce asymmetry to the
+effective $p$-wave pairing, apart from a small fraction of higher orbital
+components. The phase diagram is composed by different phases, which are
+determined by the topology and band gap nature of the superfluids. Especially,
+the gapped and gapless topological FFLO phase have totally different finite
+size effect. These novel features show that the spin-orbit coupled cold atoms
+provides an important platform in realizing topological matters which may not
+be materialized with solids.",1312.3000v1
+2015-10-06,"Interplay between Spin-Orbit Coupling and Strong Correlation Effects: Comparison of Three Osmate Double Perovskites: Ba$_{2}A$OsO$_{6}$ ($A=$Na, Ca, Y)","High formal valence Os-based double perovskites are a focus of current
+interest because they display strong interplay of large spin orbit coupling and
+strong electronic correlation. Here we present the electronic and magnetic
+characteristics of a sequence of three cubic Os based double perovskites
+Ba$_{2}$$A$OsO$_{6}$, ($A=$Na, Ca, Y), with formal valences (charge states) of
+Os$^{+7}~(d^{1})$, Os$^{+6}(d^{2})$, Os$^{+5}(d^{3})$. For these first
+principles based calculations we apply an ``exact exchange for correlated
+electrons'' functional, with exact exchange applied in a hybrid fashion solely
+to the Os($5d$) states. While Ba$_{2}$NaOsO$_{6}$ is a ferromagnetic Dirac-Mott
+insulator studied previously, the other two show antiferromagnetic ordering
+while all retain the cubic (undistorted) structure. For comparison purposes we
+have investigated only the ferromagnetic ordered phase. A metal-insulator
+transition is predicted to occur upon rotating the direction of magnetization
+in all three materials, reflecting the central role of spin orbit coupling in
+these small gap osmates. Surprises arising from comparing formal charge states
+with the radial charge densities are discussed. Chemical shielding factors and
+orbital susceptibilities are provided for comparison with future nuclear
+magnetic resonance data.",1510.01719v1
+2014-06-14,Quantum anomalous Hall phase in (001) double-perovskite monolayers via intersite spin-orbit coupling,"Using tight-binding models and first-principles calculations, we demonstrate
+the possibility to achieve a quantum anomalous Hall (QAH) phase on a
+two-dimensional square lattice, which can be realized in monolayers of double
+perovskites. We show that effective intersite spin-orbit coupling between eg
+orbitals can be induced perturbatively, giving rise to a QAH state. Moreover,
+the effective spin-orbit coupling can be enhanced by octahedral rotations.
+Based on first-principles calculations, we propose that this type of QAH state
+could be realized in La2MnIrO6 monolayers, with the size of the gap as large as
+26 meV in the ideal case. We observe that the electronic structure is sensitive
+to structural distortions, and that an enhanced Hubbard U tends to stabilize
+the nontrivial gap.",1406.4437v1
+2016-08-01,Phase Transition in IrTe$_2$ induced by spin-orbit coupling,"IrTe$_2$ has been renewed as an interesting system showing competing
+phenomenon between a questionable density-wave transition near 270 K followed
+by superconductivity with doping of high atomic number materials. Higher atomic
+numbers of Te and Ir supports strong spin-orbital coupling in this system.
+Using dynamical mean field theory with LDA band structure I have introduced
+Rashba spin orbit coupling in this system to get the interpretation for
+anomalous resistivity and related transition in this system. While no
+considerable changes are observed in DMFT results of Ir-5d band other than
+orbital selective pseudogap pinned to Fermi level, Te-p band shows a van Hove
+singularity at the Fermi level except low temperature. Finally I discuss the
+implications of these results in theoretical understanding of ordering in
+IrTe$_2$.",1608.00467v1
+2019-10-16,Anisotropic superexchange through nonmagnetic anions with spin-orbit coupling,"Anisotropic superexchange interaction is one of the most important
+interactions in realizing exotic quantum magnetism, which is traditionally
+regarded to originate from magnetic ions and has no relation with the
+nonmagnetic ions. In our work, by studying a multi-orbital Hubbard model with
+spin-orbit coupling on both magnetic cations and nonmagnetic anions, we
+analytically demonstrate that the spin-orbit coupling on nonmagnetic anions
+alone can induce antisymmetric Dzyaloshinskii-Moriya interaction, symmetric
+anisotropic exchange and single ion anisotropy on the magnetic ions and thus it
+actually contributes to anisotropic superexchange on an equal footing as that
+of magnetic ions. Our results promise one more route to realize versatile
+exotic phases in condensed matter systems, long-range orders in low dimensional
+materials and switchable single molecule magnetic devices for recording and
+manipulating quantum information through nonmagnetic anions.",1910.07118v3
+2018-03-22,Carrier dynamics in doped bilayer iridates near magnetic quantum criticality,"Motivated by experiments on the carrier-doped bilayer iridate
+$(\text{Sr}_{1-x}\text{La}_x)_3\text{Ir}_2\text{O}_7$, we study the dynamics of
+a single doped electron in a bilayer magnet in the presence of spin-orbit
+coupling, taking into account the spatially staggered rotation of IrO$_6$
+octahedra. We employ an effective single-orbital bilayer $t$-$J$ model,
+concentrating on the quantum paramagnetic phase near the magnetic quantum
+critical point. We determine the carrier dispersion using a combination of
+self-consistent Born and bond-operator techniques. Extrapolating to finite
+small carrier density we find that, for experimentally relevant parameters, the
+combination of octahedral rotation and spin-orbit coupling induces a band
+folding which results in a Fermi surface of small double electron pockets, in
+striking agreement with experimental observations. We also determine the
+influence of spin-orbit coupling on the location of the quantum critical point
+in the undoped case, and discuss aspects of the global phase diagram of doped
+bilayer Mott insulators.",1803.08516v3
+2021-07-10,Anisotropic Berry phase in the Dirac nodal-line semimetal ZrSiS: The effect of spin-orbit coupling,"The topological nodal-line semimetals (NLSMs) possess a loop of Dirac nodes
+in the k space with linear dispersion, different from the point nodes in
+Dirac/Weyl semimetals. While the quantum transport associated with the
+topologically nontrivial Dirac fermions has been investigated extensively,
+features uniquely associated with the extended nodal lines remain to be
+demonstrated. Here, we investigate the quantum oscillations (QOs) in the
+nodal-line semimetal ZrSiS, with the electron transport along the c axis, and
+magnetic field rotating in the ab plane. The extremal orbits identified through
+the field orientation dependence of the QOs interlock with the nodal line,
+leading to a nonzero Berry phase. Most importantly, the Berry phase shows a
+significant dependence on the magnetic field orientation, which we argue to be
+due to the finite spin-orbit coupling gap. Our results demonstrate the
+importance of the spin-orbit coupling and the nodal-line dispersion in
+understanding the quantum transport of NLSMs.",2107.04786v1
+2024-03-19,Electrical readout of spins in the absence of spin blockade,"In semiconductor nanostructures, spin blockade (SB) is the most scalable
+mechanism for electrical spin readout requiring only two bound spins for its
+implementation which, in conjunction with charge sensing techniques, has led to
+high-fidelity readout of spins in semiconductor-based quantum processors.
+However, various mechanisms may lift SB, such as strong spin-orbit coupling
+(SOC) or low-lying excited states, hence posing challenges to perform spin
+readout at scale and with high fidelity in such systems. Here, we present a
+method, based on the dependence of the two-spin system polarizability on energy
+detuning, to perform spin state readout even when SB lifting mechanisms are
+dominant. It leverages SB lifting as a resource to detect different spin
+measurement outcomes selectively and positively. We demonstrate the method
+using a hybrid system formed by a quantum dot (QD) and a Boron acceptor in a
+silicon p-type transistor and show spin selective and positive readout of
+different spin states under SB lifting conditions due to (i) SOC and (ii)
+low-lying orbital states in the QD. We further use the method to determine the
+detuning-dependent spin relaxation time of 0.1-8~$\mu$s. Our method should help
+perform high-fidelity projective spin measurements in systems subject to strong
+SOC and may facilitate quantum tomography and state leakage studies.",2403.12888v1
+2023-02-06,Twist-angle dependent proximity induced spin-orbit coupling in graphene/topological insulator heterostructures,"The proximity-induced spin-orbit coupling (SOC) in heterostructures of
+twisted graphene and topological insulators (TIs) Bi$_2$Se$_3$ and Bi$_2$Te$_3$
+is investigated from first principles. To build commensurate supercells, we
+strain graphene and correct thus resulting band offsets by applying a
+transverse electric field. We then fit the low-energy electronic spectrum to an
+effective Hamiltonian that comprises orbital and spin-orbit terms. For twist
+angles 0$^\circ\leq\Theta \lessapprox 20^\circ$, we find the dominant
+spin-orbit couplings to be of the valley-Zeeman and Rashba types, both a few
+meV strong. We also observe a sign change in the induced valley-Zeeman SOC at
+$\Theta\approx 10^\circ$. Additionally, the in-plane spin structure resulting
+from the Rashba SOC acquires a non-zero radial component, except at $0^\circ$
+or $30^\circ$. At $30^\circ$ the graphene Dirac cone interacts directly with
+the TI surface state. We therefore explore this twist angle in more detail,
+studying the effects of gating, TI thicknesses, and lateral shifts on the SOC
+parameters. We find, in agreement with previous results, the emergence of the
+proximitized Kane-Mele SOC, with a change in sign possible by electrically
+tuning the Dirac cone within the TI bulk band gap.",2302.03102v2
+2019-05-05,Dipole coupling of a tunable hole double quantum dot in germanium hut wire to a microwave resonator,"The germanium (Ge) hut wire system has strong spin-orbit coupling, a long
+coherence time due to a very large heavy-light hole splitting, and the
+advantage of site-controlled large-scale hut wire positioning. These properties
+make the Ge hut wire a promising candidate for the realization of strong
+coupling of spin to superconducting resonators and scalability for multiple
+qubit coupling. We have coupled a reflection line resonator to a hole double
+quantum dot (DQD) formed in Ge hut wire. The amplitude and phase responses of
+the microwave resonator revealed that the charge stability diagrams of the DQD
+are in good agreement with those obtained from transport measurements. The DQD
+interdot tunneling rate is shown to be tunable from 6.2 GHz to 8.5 GHz, which
+demonstrates the ability to adjust the frequency detuning between the qubit and
+the resonator. Furthermore, we achieved a hole-resonator coupling strength of
+up to 15 MHz, with a charge qubit decoherence rate of 0.28 GHz. Meanwhile the
+hole spin-resonator coupling rate was estimated to be 3 MHz. These results
+suggest that holes of a DQD in a Ge hut wire are dipole coupled to microwave
+photons, potentially enabling tunable hole spin-photon interactions in Ge with
+an inherent spin-orbit coupling.",1905.01586v2
+1999-07-23,Spin relaxation in semiconductor quantum dots,"We have studied the physical processes responsible for the spin -flip in GaAs
+quantum dots. We have calculated the rates for different mechanisms which are
+related to spin-orbit coupling and cause a spin-flip during the inelastic
+relaxation of the electron in the dot both with and without a magnetic field.
+We have shown that the zero-dimensional character of the problem when electron
+wave functions are localized in all directions leads to freezing out of the
+most effective spin-flip mechanisms related to the absence of the inversion
+centers in the elementary crystal cell and at the heterointerface and, as a
+result, to unusually low spin-flip rates.",9907367v1
+2002-09-12,Electron Spin Relaxation in a Semiconductor Quantum Well,"A fully microscopic theory of electron spin relaxation by the
+D'yakonov-Perel' type spin-orbit coupling is developed for a semiconductor
+quantum well with a magnetic field applied in the growth direction of the well.
+We derive the Bloch equations for an electron spin in the well and define
+microscopic expressions for the spin relaxation times. The dependencies of the
+electron spin relaxation rate on the lowest quantum well subband energy,
+magnetic field and temperature are analyzed.",0209296v2
+2003-06-16,All-Electrical Quantum Computation with Mobile Spin Qubits,"We describe and discuss a solid state proposal for quantum computation with
+mobile spin qubits in one-dimensional systems, based on recent advances in
+spintronics. Static electric fields are used to implement a universal set of
+quantum gates, via the spin-orbit and exchange couplings. Initialization and
+measurement can be performed either by spin injection from/to ferromagnets, or
+by using spin filters and mesoscopic spin polarizing beam-splitters. The
+vulnerability of this proposal to various sources of error is estimated by
+numerical simulations. We also assess the suitability of various materials
+currently used in nanotechnology for an actual implementation of our model.",0306401v1
+2003-11-27,Drift-Diffusion Approach to Spin-Polarized Transport,"We develop a drift-diffusion equation that describes electron spin
+polarization density in two-dimensional electron systems. In our approach,
+superpositions of spin-up and spin-down states are taken into account, what
+distinguishes our model from the traditional two-component drift-diffusion
+approximation. The Dresselhaus and Rashba spin-orbit coupling mechanisms are
+incorporated into consideration, as well as an applied electric field. The
+derived equation is applied to the modelling of relaxation of homogeneous spin
+polarization. Our results are consistent with previous studies.",0311633v3
+2004-04-02,Splitting electronic spins with a Kondo double dot device,"We present a simple device made of two small capacitively coupled quantum
+dots in parallel. This set-up can be used as an efficient ""Stern-Gerlach"" spin
+filter, able to simultaneously produce, from a normal metallic lead, two
+oppositely spin-polarized currents when submitted to a local magnetic field.
+Our proposal is based on the realization of a Kondo effect where spin and
+orbital degrees of freedom are entangled, allowing a spatial separation between
+the two spin polarized currents. In the low temperature Kondo regime, the
+efficiency is very high and the device conductance reaches the unitary limit,
+$\frac{e^2}{h}$ per spin branch.",0404037v2
+2004-09-22,Rashba spin precession in quantum Hall edge channels,"Quasi--one dimensional edge channels are formed at the boundary of a
+two-dimensional electron system subject to a strong perpendicular magnetic
+field. We consider the effect of Rashba spin--orbit coupling, induced by
+structural inversion asymmetry, on their electronic and transport properties.
+Both our analytical and numerical results show that spin--split quantum--Hall
+edge channels exhibit properties analogous to that of Rashba--split quantum
+wires. Suppressed backscattering and a long spin life time render these edge
+channels an ideal system for observing voltage--controlled spin precession.
+Based on the latter, we propose a magnet--less spin--dependent electron
+interferometer.",0409580v1
+2004-10-08,Spin-dependent resonant tunneling in symmetrical double-barrier structure,"A theory of resonant spin-dependent tunneling has been developed for
+symmetrical double-barrier structures grown of non-centrosymmetrical
+semiconductors. The dependence of the tunneling transparency on the spin
+orientation and the wave vector of electrons leads to (i) spin polarization of
+the transmitted carriers in an in-plane electric field, (ii) generation of an
+in-plane electric current under tunneling of spin-polarized carriers. These
+effects originated from spin-orbit coupling-induced splitting of the resonant
+level have been considered for double-barrier tunneling structures.",0410198v1
+2004-12-20,Intrinsic Spin-Hall Effect in n-Doped Bulk GaAs,"We show that the bulk Dresselhauss ($k^3$) spin-orbit coupling term leads to
+an intrinsic spin-Hall effect in n-doped bulk GaAs, but without the appearance
+of uniform magnetization. The spin-Hall effect in strained and unstrained bulk
+GaAs has been recently observed experimentally by Kato {\emph{et. al.}}
+\cite{kato2004A}. We show that the experimental result is quantitatively
+consistent with the intrinsic spin-Hall effect due to the Dresselhauss term,
+when lifetime broadening is taken into account. On the other hand, extrinsic
+contribution to the spin-Hall effect is several orders of magnitude smaller
+than the observed effect.",0412550v1
+2005-01-31,Spin Polarization and Dichroism Effects by Electric Field,"We show that electric field can induce spin polarization and dichroism
+effects in angle resolved photoemission spectroscopy (ARPES) in spin orbit
+coupling systems. The physical origin behind the effects essentially is the
+same as the spin Hall effect induced by the electric field. Since the ARPES
+experiments have both energy and momentum resolutions, the spin Hall effect can
+be directly verified by the ARPES experiments for individual band even if there
+is no net spin current.",0502005v1
+2005-01-31,Spin current injection by intersubband transitions in quantum wells,"We show that a pure spin current can be injected in quantum wells by the
+absorption of linearly polarized infrared radiation, leading to transitions
+between subbands. The magnitude and the direction of the spin current depend on
+the Dresselhaus and Rashba spin-orbit coupling constants and light frequency
+and, therefore, can be manipulated by changing the light frequency and/or
+applying an external bias across the quantum well. The injected spin current
+should be observable either as a voltage generated via the anomalous spin-Hall
+effect, or by spatially resolved pump-probe optical spectroscopy.",0502007v2
+2005-03-20,Charge and spin density modulations in semiconductor quantum wires,"We investigate static charge and spin density modulation patterns along a
+ferromagnet/semiconductor single junction quantum wire in the presence of
+spin-orbit coupling. Coherent scattering theory is used to calculate the charge
+and spin densities in the ballistic regime. The observed oscillatory behavior
+is explained in terms of the symmetry of the charge and spin distributions of
+eigenstates in the semiconductor quantum wire. Also, we discuss the condition
+that these charge and spin density oscillations can be observed experimentally.",0503513v1
+2005-04-14,Intrinsic Spin Hall Effect,"A brief review is given on the spin Hall effect, where an external electric
+field induces a transverse spin current. It has been recognized over 30 years
+that such effect occurs due to impurities in the presence of spin-orbit
+coupling. Meanwhile, it was proposed recently that there is also an intrinsic
+contribution for this effect. We explain the mechanism for this intrinsic spin
+Hall effect. We also discuss recent experimental observations of the spin Hall
+effect.",0504353v2
+2006-01-09,Spin transverse force and intrinsic quantum transverse transport,"The spin-orbit coupling may generate spin transverse force on moving electron
+spin, which gives a heuristic picture for the quantum transverse transport of
+electron. A relation between the spin and anomalous Hall conductance and spin
+force was established, and applied to several systems. It was predicted that
+the sign change of anomalous Hall conductance can occur in diluted magnetic
+semiconductors of narrow band and can be applied to identify intrinsic
+mechanism experimentally.",0601152v2
+2006-06-08,Spin relaxation in narrow wires of a two-dimensional electron gas,"How does an initially homogeneous spin-polarization in a confined
+two-dimensional electron gas with Rashba spin-orbit coupling evolve in time?
+How does the relaxation time depend on system size? We study these questions
+for systems of a size that is much larger than the Fermi wavelength, but
+comparable and even shorter than the spin relaxation length. Depending on the
+confinement spin-relaxation may become faster or slower than in the bulk. An
+initially homogeneously polarized spin system evolves into a spiral pattern.",0606209v1
+2007-01-25,Current-induced spin polarization and the spin Hall effect: a quasiclassical approach,"The quasiclassical Green function formalism is used to describe charge and
+spin dynamics in the presence of spin-orbit coupling. We review the results
+obtained for the spin Hall effect on restricted geometries. The role of
+boundaries is discussed in the framework of spin diffusion equations.",0701629v1
+2008-05-15,Spin polarizations and spin Hall currents in a two-dimensional electron gas with magnetic impurities,"We consider a two-dimensional electron gas in the presence of Rashba
+spin-orbit coupling, and study the effects of magnetic s-wave impurities and
+long-range non-magnetic disorder on the spin-charge dynamics of the system. We
+focus on voltage induced spin polarizations and their relation to spin Hall
+currents. Our results are obtained using the quasiclassical Green function
+technique, and hold in the full range of the disorder parameter $\alpha
+p_F\tau$.",0805.2346v2
+2008-09-29,Spin-dependent electron transport through a parallel double-quantum-dot structure,"Electron transport properties in a parallel double-quantum-dot structure with
+three-terminals are theoretically studied. By introducing a local Rashba
+spin-orbit coupling, we find that an incident electron from one terminal can
+select a specific terminal to depart from the quantum dots according to its
+spin state. As a result, spin polarization and spin separation can be
+simultaneously realized in this structure. And spin polarizations in different
+terminals can be inverted by tuning the structure parameters. The underlying
+quantum interference that gives rise to such a result is analyzed in the
+language of Feynman paths for the electron transmission.",0809.4913v1
+2009-04-07,Spin angular impulse due to spin-dependent reflection off a barrier,"The spin-dependent elastic reflection of quasi two-dimensional electrons from
+a lateral impenetrable barrier in the presence of band-structure spin-orbit
+coupling results in a spin angular impulse exerted on the electrons which is
+proportional to the nontrivial difference between the electrons' momentum and
+velocity. Even for an unpolarized incoming beam we find that the spin angular
+impulse is nonzero when averaged over all components of the reflected beam. We
+present a detailed analysis of the kinematics of this process.",0904.1228v2
+2009-05-04,Electron spin relaxation in graphene: the role of the substrate,"Theory of the electron spin relaxation in graphene on the SiO$_2$ substrate
+is developed. Charged impurities and polar optical surface phonons in the
+substrate induce an effective random Bychkov-Rashba-like spin-orbit coupling
+field which leads to spin relaxation by the D'yakonov-Perel' mechanism.
+Analytical estimates and Monte Carlo simulations show that the corresponding
+spin relaxation times are between micro- to milliseconds, being only weakly
+temperature dependent. It is also argued that the presence of adatoms on
+graphene can lead to spin lifetimes shorter than nanoseconds.",0905.0424v2
+2009-06-20,Wavevector-dependent spin filtering and spin transport through magnetic barriers in graphene,"We study the spin-resolved transport through magnetic nanostructures in
+monolayer and bilayer graphene. We take into account both the orbital effect of
+the inhomogeneous perpendicular magnetic field as well as the in-plane spin
+splitting due to the Zeeman interaction and to the exchange coupling possibly
+induced by the proximity of a ferromagnetic insulator. We find that a single
+barrier exhibits a wavevector-dependent spin filtering effect at energies close
+to the transmission threshold. This effect is significantly enhanced in a
+resonant double barrier configuration, where the spin polarization of the
+outgoing current can be increased up to 100% by increasing the distance between
+the barriers.",0906.3809v1
+2010-11-03,Voltage controlled spin precession in InAs quantum wells,"In this work we investigate spin diffusion in InAs quantum wells with the
+Rashba spin-orbit coupling modulated by a gate voltage. The gate voltage
+dependence of the spin diffusion under different temperatures is studied with
+all the scattering explicitly included. Our result partially supports the claim
+of the realization of the Datta-Das spin-injected field effect transistor by
+Koo {\it et al.} [Science {\bf 325}, 1515 (2009)]. We also show that the
+scattering plays an important role in spin diffusion in such a system.",1011.0813v2
+2011-04-08,Zero temperature geometric spin dephasing on a ring in presence of an Ohmic environment,"We study zero temperature spin dynamics of a particle confined to a ring in
+presence of spin orbit coupling and Ohmic electromagnetic fluctuations. We show
+that the dynamics of the angular position $\theta(t)$ are decoupled from the
+spin dynamics and that the latter is mapped to certain correlations of a
+spinless particle. We find that the spin correlations in the $z$ direction
+(perpendicular to the ring) are finite at long times, i.e. do not dephase. The
+parallel (in plane) components for spin $\half$ do not dephase at weak
+dissipation but they probably decay as a power law with time at strong
+dissipation.",1104.1637v1
+2011-06-15,Spin Scissors Mode and the Fine Structure of M1 States in Nuclei,"The coupled dynamics of low lying modes, including the scissors mode, and
+various giant quadrupole resonances are studied with the help of the Wigner
+Function Moments method generalized to take into account spin degrees of
+freedom. Equations of motion for collective variables are derived on the basis
+of Time Dependent Hartree-Fock equations in the model of harmonic oscillator
+with spin orbital mean field potential plus quadrupole-quadrupole residual
+interaction. Introducing spin allows one to consider new types of nuclear
+collective motion where the nucleons with spin 'up' oscillate against nucleons
+with spin 'down'.",1106.2963v1
+2013-03-26,Current-driven domain wall motion with spin Hall effect: Reduction of threshold current density,"We theoretically study the current-driven domain wall motion in the presence
+of both the spin Hall effect and an extrinsic pinning potential. The spin Hall
+effect mainly affects the damping ratio of the domain wall precession in the
+pinning potential. When the pinning potential is not too strong, this results
+in a significant reduction of a threshold current density for the depinning of
+a domain wall with certain polarity. We also propose one way to distinguish the
+spin Hall effect induced spin-transfer torque from the one induced by the
+Rashba spin-orbit coupling experimentally.",1303.6458v1
+2013-07-12,Fermi liquid theory of resonant spin pumping,"We study resonant all-electric adiabatic spin pumping through a quantum dot
+with two nearby levels by using a Fermi liquid approach in the strongly
+interacting regime, combined with a projective numerical renormalization group
+(NRG) theory. Due to spin-orbit coupling, a strong spin pumping resonance
+emerges at every charging transition, which allows for the transfer of a spin
+$~ \hbar/2$ through the device in a single pumping cycle. Depending on the
+precise geometry of the device, controlled pure spin pumping is also possible.",1307.3416v2
+2015-03-10,Graphene Spintronics,"The isolation of graphene has triggered an avalanche of studies into the
+spin-dependent physical properties of this material, as well as graphene-based
+spintronic devices. Here we review the experimental and theoretical
+state-of-art concerning spin injection and transport, defect-induced magnetic
+moments, spin-orbit coupling and spin relaxation in graphene. Future research
+in graphene spintronics will need to address the development of applications
+such as spin transistors and spin logic devices, as well as exotic physical
+properties including topological states and proximity-induced phenomena in
+graphene and other 2D materials.",1503.02743v1
+2015-08-27,Kane model parameters and stochastic spin current,"The spin current and spin conductivity is computed through thermally driven
+stochastic process. By evaluating the Kramers equation and with the help of
+$\vec{k}.\vec{p}$ method we have studied the spin Hall scenario. Due to the
+thermal assistance, the Kane model parameters get modified, which consequently
+modulate the spin orbit coupling(SOC). This modified SOC causes the spin
+current to change in a finite amount.",1508.06764v1
+2008-07-27,Tunneling spin current and spin diode behavior in bilayer system,"The coherent tunneling spin current in the bilayer system with spin-orbit
+coupling is investigated. Based on the continuity-like equations, we discuss
+the definition of the tunneling current and show that the overlaps between
+wavefunctions for different layers contribute to the tunneling current. We
+study the linear response of the tunneling spin current to an in-plane electric
+field in the presence of nonmagnetic impurities. The tunneling spin
+conductivity we obtained presents a feature asymmetrical with respect to the
+gate voltage when the strengthes of impurity potentials are different in each
+layer.",0807.4296v1
+2009-12-16,Universality of Anderson transition in two-dimensional systems of symplectic symmetry class,"We investigate localization of noninteracting particles with spins higher
+than 1/2 in a two-dimensional random potential in presence of spin-orbit
+coupling. We consider an integer spin ($s=1$) and a half-integer spin ($s=3/2$)
+belonging to orthogonal and symplectic symmetry classes, respectively. We show
+that particles with integer spin are localized and those with half-integer spin
+exhibit Anderson transition. The transition belongs to universality class of
+conventional symplectic model for spin-1/2 particles.",0912.3084v2
+2013-09-02,Proposal for a local heating driven spin current generator,"We propose a two-terminal spin-orbit interferometer with a hot molecule
+inserted in one of its arms to generate pure spin currents. Local heating is
+achieved by coupling the vibrational modes of the molecule to a third
+(phononic) reservoir. We show that this spin calorimetric effect is due to the
+combined influence of spin-dependent wave interference and inelastic
+scattering. Remarkably, the device converts heat flow into spin-polarized
+current even without applying any voltage or temperature difference to the
+electronic terminals.",1309.0366v1
+2018-12-17,Intrinsic Spin Hall Conductivity of MoTe2 and WTe2 Semimetals,"We report a comprehensive study on the intrinsic spin Hall conductivity (SHC)
+of semimetals MoTe2 and WTe2 by ab initio calculation. Large SHC and desirable
+spin Hall angles have been discovered, due to the strong spin orbit coupling
+effect and low charge conductivity in semimetals. Diverse anisotropic SHC
+values, attributed to the unusual reduced-symmetry crystalline structure, have
+been revealed. We report an effective method on SHC optimization by electron
+doping, and exhibit the mechanism of SHC variation respect to the energy
+shifting by the spin Berry curvature. Our work provides insights into the
+realization of strong spin Hall effects in 2D systems.",1812.06910v1
+2019-08-20,Spin-selective Aharonov-Casher caging in a topological quantum network,"A periodic network of connected rhombii, mimicking a spintronic device, is
+shown to exhibit an intriguing spin selective extreme localization, when
+submerged in a uniform out of plane electric field. The topological Aharonov
+Casher phase acquired by a travelling spin is seen to induce a complete caging,
+triggered at a special strength of the spin orbit coupling, for half odd
+integer spins s \ge n\hbar/2, with n odd, sparing the integer spins. The
+observation finds exciting experimental parallels in recent literature on
+caged, extreme localized modes in analogous photonic lattices. Our results are
+exact.",1908.07175v1
+2019-12-24,Large spin Hall angle and spin mixing conductance in highly resistive antiferromagnetic Mn2Au,"Antiferromagnetic (AFM) materials recently have shown interest in the
+research in spintronics due to its zero stray magnetic field, high anisotropy,
+and spin orbit coupling. In this context, the bi-metallic AFM Mn2Au has drawn
+attention because it exhibits unique properties and its Neel temperature is
+very high. Here, we report spin pumping and inverse spin Hall effect
+investigations in Mn2Au and CoFeB bilayer system using ferromagnetic resonance.
+We found large spin Hall angle {\theta}_SH = 0.22",1912.11522v2
+2023-12-30,Ultrafast X-ray Diffraction Probe of Coherent Spin-state Dynamics in Molecules,"We propose an approach to probe coherent spin-state dynamics of molecules
+using circularly polarized hard x-ray pulses. For the dynamically aligned
+nitric oxide molecules in a coherent superposition spin-orbit coupled
+electronic state that can be prepared through stimulated Raman scattering, we
+demonstrate the capability of ultrafast x-ray diffraction to not only reveal
+the quantum beating of the coherent spin-state wave packet, but also image the
+spatial spin density of the molecule. With circularly polarized ultrafast x-ray
+diffraction signal, we show that the electronic density matrix can be
+retrieved. The spatio-temporal resolving power of ultrafast x-ray diffraction
+paves the way for tracking transient spatial wave function in molecular
+dynamics involving spin degree of freedom.",2401.00259v1
+2024-03-21,Efecto Hall de espin inverso en peliculas de Nb Mo y Bi por bombeo de espin,"The inverse spin Hall effect used for detection of spin currents was observed
+by voltage measurements in bilayers of normal metal (NM)/ferromagnetic metal
+(FM), using Nb, Mo and Bi as normal metal and Permalloy (Py,
+Ni$_{81}$Fe$_{19}$) as ferromagnetic metal. The spin current was generated by
+the spin pumping effect with ferromagnetic resonance. The samples were
+deposited by dc magnetron sputtering at room temperature on Si (001)
+substrates. The three bilayers of Nb/Py, Mo/Py and Bi/Py had a spin-orbit
+coupling large enough to observe the voltage generation by spin Hall effect",2403.17976v1
+2003-09-25,Strong-coupling theory of superconductivity in a degenerate Hubbard model,"In order to discuss superconductivity in orbital degenerate systems, a
+microscopic Hamiltonian is introduced. Based on the degenerate model, a
+strong-coupling theory of superconductivity is developed within the fluctuation
+exchange (FLEX) approximation where spin and orbital fluctuations, spectra of
+electron, and superconducting gap function are self-consistently determined.
+Applying the FLEX approximation to the orbital degenerate model, it is shown
+that the $d_{x^2-y^2}$-wave superconducting phase is induced by increasing the
+orbital splitting energy which leads to the development and suppression of the
+spin and orbital fluctuations, respectively. It is proposed that the orbital
+splitting energy is a controlling parameter changing from the paramagnetic to
+the antiferromagnetic phase with the $d_{x^2-y^2}$-wave superconducting phase
+in between.",0309575v1
+2004-07-05,Ferromagnetic fluctuation and possible triplet superconductivity in Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model,"Spin and charge fluctuations and superconductivity in a recently discovered
+superconductor Na_xCoO_2*yH_2O are studied based on a multi-orbital Hubbard
+model. Tight-binding parameters are determined to reproduce the LDA band
+dispersions with the Fermi surface, which consist of a large cylindrical one
+around the Gamma-point and six hole pockets near the K-points. By applying the
+fluctuation-exchange (FLEX) approximation, we show that the Hund's-rule
+coupling between the Co t2g orbitals causes ferromagnetic (FM) spin
+fluctuation. Triplet f_{y(y^2-3x^2)}-wave and p-wave pairings are favored by
+this FM fluctuation on the hole-pocket band. We propose that, in
+Na_xCoO_2*yH_2O, the Co t2g orbitals and inter-orbital Hund's-rule coupling
+play important roles on the triplet pairing, and this compound can be a first
+example of the triplet superconductor in which the orbital degrees of freedom
+play substantial roles.",0407094v3
+2012-10-05,Orbital phases of fermions in an asymmetric optical ladder,"We study a quantum ladder of interacting fermions with coupled s and p
+orbitals. Such a model describes dipolar molecules or atoms loaded into a
+double-well optical lattice, dipole moments being aligned by an external field.
+The two orbital components have distinct hoppings. The tunneling between them
+is equivalent to a partial Rashba spin-orbital coupling when the orbital space
+(s, p) is identified as spanned by pseudo-spin 1/2 states. A rich phase
+diagram, including incommensurate orbital density wave, pair density wave and
+other exotic superconducting phases, is proposed with bosonization analysis. In
+particular, superconductivity is found in the repulsive regime.",1210.1859v2
+2019-08-24,SU(4) Heisenberg model on the honeycomb lattice with exchange-frustrated perturbations: implications for twistronics and Mott insulators,"The SU(4)-symmetric spin-orbital model on the honeycomb lattice was recently
+studied in connection to correlated insulators such as the $e_{g}$ Mott
+insulator Ba$_{3}$CuSb$_{2}$O$_{9}$ and the insulating phase of magic-angle
+twisted bilayer graphene at quarter filling. Here we provide a unified
+discussion of these systems by investigating an extended model that includes
+the effects of Hund's coupling and anisotropic, orbital-dependent exchange
+interactions. Using a combination of mean-field theory, linear flavor-wave
+theory, and variational Monte Carlo, we show that this model harbors a quantum
+spin-orbital liquid over a wide parameter regime around the SU(4)-symmetric
+point. For large Hund's coupling, a ferromagnetic antiferro-orbital ordered
+state appears, while a valence-bond crystal combined with a vortex orbital
+state is stabilized by dominant orbital-dependent exchange interactions.",1908.09224v2
+2016-02-25,Phase diagram and collective excitation in excitonic insulator: from the orbital physics viewpoint,"Excitonic insulating system is studied from the viewpoints of the orbital
+physics in strongly correlated electron systems. An effective model Hamiltonian
+for low-energy electronic states is derived from the two-orbital Hubbard model
+with a finite energy difference corresponding to the crystalline field
+splitting. The effective model is represented by the spin operators and the
+pseudo-spin operators for the spin-state degrees of freedom. The ground state
+phase diagram is analyzed by the mean-field approximation. In addition to the
+low-spin state and high-spin state phases, two kinds of the excitonic
+insulating phases emerge as a consequence of the competition between the
+crystalline field effect and the Hund coupling. The excitonic transition is
+classified to be an Ising-like transition reflecting a spontaneous breaking of
+the $Z_2$ symmetry. Magnetic structures in the two excitonic insulating phases
+are different from each other; an antiferromagnetic order and a spin nematic
+order. Collective excitations in each phase are examined by using the
+generalized spin-wave method. The Goldstone modes in the excitonic insulating
+phases appear in the dynamical correlation functions for the spins and
+pseudo-spin operators. Both the transverse and longitudinal spin excitation
+modes are active in the two excitonic insulating phases in contrast to the
+low-spin state and high-spin state phases. Connections of the present results
+to the perovskite cobalt oxides are discussed.",1602.07831v2
+2021-10-07,Relativistic scattering of a fast spinning neutron star by a massive black hole,"The orbital dynamics of fast spinning neutron stars encountering a massive
+Black Hole (BH) with unbounded orbits are investigated using the
+quadratic-in-spin Mathisson-Papapetrou- Dixon (MPD) formulation. We consider
+the motion of the spinning neutron stars with astrophysically relevant speed in
+the gravity field of the BH. For such slow-speed scattering, the hyperbolic
+orbits followed by these neutron stars all have near the e = 1 eccentricity,
+and have distinct properties compared with those of e >> 1. We have found that
+compared with geodesic motion, the spin-orbit and spin-spin coupling will lead
+to a variation of scattering angles at spatial infinity, and this variation is
+more prominent for slow-speed scattering than fast-speed scattering. Such a
+variation leads to an observable difference in pulse-arrival-time within a few
+hours of observation, and up to a few days or months for larger BH masses or
+longer spinning periods. Such a relativistic pulsar-BH system also emits a
+burst of gravitational waves (GWs) in the sensitivity band of LISA, and for
+optimal settings, can be seen up to 100 Mpc away. A radio follow up of such a
+GW burst with SKA or FAST will allow for measuring the orbital parameters with
+high accuracy and testing the predictions of General Relativity (GR).",2110.03494v1
+2015-08-07,Spin reorientation driven by the interplay between spin-orbit coupling and Hund's rule coupling in iron pnictides,"In most magnetically-ordered iron pnictides, the magnetic moments lie in the
+FeAs planes, parallel to the modulation direction of the spin stripes. However,
+recent experiments in hole-doped iron pnictides have observed a reorientation
+of the magnetic moments from in-plane to out-of-plane. Interestingly, this
+reorientation is accompanied by a change in the magnetic ground state from a
+stripe antiferromagnet to a tetragonal non-uniform magnetic configuration.
+Motivated by these recent observations, here we investigate the origin of the
+spin anisotropy in iron pnictides using an itinerant microscopic electronic
+model that respects all the symmetry properties of a single FeAs plane. We find
+that the interplay between the spin-orbit coupling and the Hund's rule coupling
+can account for the observed spin anisotropies, including the spin
+reorientation in hole-doped pnictides, without the need to invoke orbital or
+nematic order. Our calculations also reveal an asymmetry between the magnetic
+ground states of electron- and hole-doped compounds, with only the latter
+displaying tetragonal magnetic states.",1508.01763v4
+2018-05-03,Post-Newtonian spin-tidal couplings for compact binaries,"We compute the spin-tidal couplings that affect the dynamics of two orbiting
+bodies at the leading order in the post-Newtonian (PN) framework and to linear
+order in the spin. These corrections belong to two classes: (i) terms arising
+from the coupling between the ordinary tidal terms and the point-particle
+terms, which depend on the standard tidal Love numbers of order $l$ and affect
+the gravitational-wave (GW) phase at $(2l+5/2)$PN order and (ii) terms
+depending on the rotational tidal Love numbers, recently introduced in previous
+work, that affect the GW phase at $(2l+1/2+\delta_{2l})$PN order. For circular
+orbits and spins orthogonal to the orbital plane, all leading-order spin-tidal
+terms enter the GW phase at $1.5$PN order relative to the standard,
+quadrupolar, tidal deformability term (and, thus, before the standard octupolar
+tidal deformability terms). We present the GW phase that includes all tidal
+terms up to $6.5$PN order and to linear order in the spin. We comment on a
+conceptual issue related to the inclusion of the rotational tidal Love numbers
+in a Lagrangian formulation and on the relevance of spin-tidal couplings for
+parameter estimation in coalescing neutron-star binaries and for tests of
+gravity.",1805.01487v3
+2020-01-26,Electronically driven spin-reorientation transition of the correlated polar metal Ca$_3$Ru$_2$O$_7$,"Polar distortions in solids give rise to the well-known functionality of
+switchable macroscopic polarisation in ferroelectrics and, when combined with
+strong spin-orbit coupling, can mediate giant spin splittings of electronic
+states. While typically found in insulators, ferroelectric-like distortions can
+remain robust against increasing itineracy, giving rise to so-called ""polar
+metals"". Here, we investigate the temperature-dependent electronic structure of
+Ca$_3$Ru$_2$O$_7$, a correlated oxide metal in which octahedral tilts and
+rotations combine to mediate pronounced polar distortions. Our angle-resolved
+photoemission measurements reveal the destruction of a large hole-like Fermi
+surface upon cooling through a coupled structural and spin-reorientation
+transition at 48 K, accompanied by a sudden onset of quasiparticle coherence.
+We demonstrate how these result from band hybridisation mediated by a hidden
+Rashba-type spin-orbit coupling. This is enabled by the bulk structural
+distortions and unlocked when the spin reorients perpendicular to the local
+symmetry-breaking potential at the Ru sites. We argue that the electronic
+energy gain associated with the band hybridisation is actually the key driver
+for the phase transition, reflecting a delicate interplay between spin-orbit
+coupling and strong electronic correlations, and revealing a new route to
+control magnetic ordering in solids.",2001.09499v1
+2004-12-28,Magnetic state of plutonium ion in metallic Pu and its compounds,"By LDA+U method with spin-orbit coupling (LDA+U+SO) the magnetic state and
+electronic structure have been investigated for plutonium in \delta and \alpha
+phases and for Pu compounds: PuN, PuCoGa5, PuRh2, PuSi2, PuTe, and PuSb. For
+metallic plutonium in both phases in agreement with experiment a nonmagnetic
+ground state was found with Pu ions in f^6 configuration with zero values of
+spin, orbital, and total moments. This result is determined by a strong
+spin-orbit coupling in 5f shell that gives in LDA calculation a pronounced
+splitting of 5f states on f^{5/2} and f^{7/2} subbands. A Fermi level is in a
+pseudogap between them, so that f^{5/2} subshell is already nearly completely
+filled with six electrons before Coulomb correlation effects were taken into
+account. The competition between spin-orbit coupling and exchange (Hund)
+interaction (favoring magnetic ground state) in 5f shell is so delicately
+balanced, that a small increase (less than 15%) of exchange interaction
+parameter value from J_H=0.48eV obtained in constrain LDA calculation would
+result in a magnetic ground state with nonzero spin and orbital moment values.
+For Pu compounds investigated in the present work, predominantly f^6
+configuration with nonzero magnetic moments was found in PuCoGa5, PuSi2, and
+PuTe, while PuN, PuRh2, and PuSb have f^5 configuration with sizeable magnetic
+moment values. Whereas pure jj coupling scheme was found to be valid for
+metallic plutonium, intermediate coupling scheme is needed to describe 5f shell
+in Pu compounds. The results of our calculations show that both spin-orbit
+coupling and exchange interaction terms in the Hamiltonian must be treated in a
+general matrix form for Pu and its compounds.",0412724v2
+2006-08-07,Polarization-induced Rashba spin-orbit coupling in structurally symmetric III-Nitride quantum wells,"The effective linear coupling coefficient and the total spin-splitting are
+calculated in Ga- and N- face InGaN quantum wells. Alloy content, geometry, and
+gate voltage affect an internal field and an electron density distribution in
+the growth direction that has direct effect on a spin-splitting. The sign of
+structural inversion asymmetry (SIA) spin-orbit coupling coefficient depends on
+an internal electric field in the well that results in different signs for
+Ga-face and N-face III-Nitride structures. The effective linear coupling
+coefficient is always positive because of the Dresselhaus-type contribution
+that is a major one in quantum wells under consideration. The magnitude of the
+spin-splitting is comparable with that experimentally observed in III-Nitrides
+and III-V zinc-blende structures.",0608179v1
+2019-04-17,Dynamical spin-orbit coupling of a quantum gas,"We realize the dynamical 1D spin-orbit-coupling (SOC) of a Bose-Einstein
+condensate confined within an optical cavity. The SOC emerges through
+spin-correlated momentum impulses delivered to the atoms via Raman transitions.
+These are effected by classical pump fields acting in concert with the quantum
+dynamical cavity field. Above a critical pump power, the Raman coupling emerges
+as the atoms superradiantly populate the cavity mode with photons.
+Concomitantly, these photons cause a back-action onto the atoms, forcing them
+to order their spin-spatial state. This SOC-inducing superradiant Dicke phase
+transition results in a spinor-helix polariton condensate. We observe emergent
+SOC through spin-resolved atomic momentum imaging. Dynamical SOC in quantum gas
+cavity QED, and the extension to dynamical gauge fields, may enable the
+creation of Meissner-like effects, topological superfluids, and exotic quantum
+Hall states in coupled light-matter systems.",1904.08388v1
+2012-02-14,Quantum tri-criticality and phase transitions in spin-orbit coupled Bose-Einstein condensates,"We consider a spin-orbit coupled configuration of spin-1/2 interacting bosons
+with equal Rashba and Dresselhaus couplings. The phase diagram of the system is
+discussed with special emphasis to the role of the interaction treated in the
+mean-field approximation. For a critical value of the density and of the Raman
+coupling we predict the occurrence of a characteristic tri-critical point
+separating the spin mixed, the phase separated and the single minimum states of
+the Bose gas. The corresponding quantum phases are investigated analyzing the
+momentum distribution, the longitudinal and transverse spin-polarization and
+the emergence of density fringes. The effect of harmonic trapping as well as
+the role of the breaking of spin symmetry in the interaction Hamiltonian are
+also discussed.",1202.3036v2
+2012-06-28,Theory of Spin Relaxation in Two-Electron Lateral Coupled Si/SiGe Quantum Dots,"Highly accurate numerical results of phonon-induced two-electron spin
+relaxation in silicon double quantum dots are presented. The relaxation,
+enabled by spin-orbit coupling and the nuclei of $^{29}$Si (natural or purified
+abundance), are investigated for experimentally relevant parameters, the
+interdot coupling, the magnetic field magnitude and orientation, and the
+detuning. We calculate relaxation rates for zero and finite temperatures (100
+mK), concluding that our findings for zero temperature remain qualitatively
+valid also for 100 mK. We confirm the same anisotropic switch of the axis of
+prolonged spin lifetime with varying detuning as recently predicted in GaAs.
+Conditions for possibly hyperfine-dominated relaxation are much more stringent
+in Si than in GaAs. For experimentally relevant regimes, the spin-orbit
+coupling, although weak, is the dominant contribution, yielding anisotropic
+relaxation rates of at least two order of magnitude lower than in GaAs.",1206.6906v2
+2020-11-25,Non-tidal Coupling of the Orbital and Rotational Motions of Extended Bodies,"The orbital motions and spin-axis rotations of extended bodies are
+traditionally considered to be coupled only by tidal mechanisms. The orbit-spin
+coupling hypothesis supplies an additional mechanism. A reversing torque on
+rotating extended bodies is identified. The torque effects an exchange of
+angular momentum between the reservoirs of the orbital and rotational motions.
+The axis of the torque is constrained to lie within the equatorial plane of the
+subject body. Hypothesis testing to date has focused on the response to the
+putative torque of the Martian atmosphere. Atmospheric global circulation model
+simulations reveal that an episodic strengthening and weakening of meridional
+overturning circulations should be observable and is diagnostic in connection
+with the triggering of Martian planet-encircling dust storms. Spacecraft
+observations obtained during the earliest days of the 2018 Martian global dust
+storm document a strong intensification of atmospheric meridional motions as
+predicted under this hypothesis. We review implications for atmospheric
+physics, for investigations of planetary orbital evolution with rotational
+energy dissipation, and for theories of gravitation.",2011.13053v1
+2023-06-19,Superconductivity from polar fluctuations in multi-orbital systems,"Motivated by the superconductivity near paraelectric (PE) to ferroelectric
+(FE) quantum critical point (QCP) in polar metals, we study polar fluctuation
+mediated superconductivity in multi-orbital systems. The PE to FE QCP is
+approached by softening of a transverse optical (TO) phonon that is odd under
+inversion ($\mathcal{I}$). We show that the necessary and sufficient condition
+for the linear coupling between electron-TO phonon is the presence of multiple
+orbitals on the Fermi-surface, irrespective of the spin-orbital (SO) coupling,
+multiple electronic bands, or the vicinity to band crossings. We show that the
+linear coupling to the polar fluctuations (such as TO modes) can generally lead
+to superconductivity. We also show that irrespective of the strong $\vec{k}$
+dependence of the effective electron-electron interaction in the BCS channel,
+quite generally the even-parity channel leads to the highest critical
+temperature. In the presence of additional repulsive electron-electron
+interactions, an odd-parity spin-triplet channel can become the leading BCS
+instability. Finally, we discuss our results in the context of the
+superconductivity in $\text{SrTiO}_3$ and $\text{KTaO}_3$ that highlights the
+importance of the underlying multi-orbital physics if the superconductivity is
+mediated by the polar fluctuations.",2306.11063v1
+2010-12-14,Chiral Rashba spin textures in ultra-cold Fermi gases,"Spin-orbit coupling is an important ingredient in many recently discovered
+phenomena such as the spin-Hall effect and topological insulators. Of
+particular interest is topological superconductivity, with its potential
+application in topological quantum computation. The absence of disorder in
+ultra-cold atomic systems makes them ideal for quantum computation
+applications, however, the spin-orbit (SO) coupling schemes proposed thus far
+are experimentally impractical owing to large spontaneous emission rates in the
+alkali fermions. In this paper, we develop a scheme to generate Rashba SO
+coupling with a low spontaneous emission extension to a recent experiment. We
+show that this scheme generates a Fermi surface spin texture for $^{40}\rm{K}$
+atoms, which is observable in time-of-flight measurements. The chiral spin
+texture, together with conventional $s$-wave interactions leads to topological
+superconductivity and non-Abelian Majorana quasiparticles.",1012.3170v2
+2011-10-29,High-temperature Aharonov-Bohm-Casher interferometer,"We study theoretically the combined effect of the spin-orbit and Zeeman
+interactions on the tunneling electron transport through a single-channel
+quantum ring threaded by magnetic flux. We focus on the high temperature case
+(temperature is much higher than the level spacing in the ring) and demonstrate
+that spin-interference effects are not suppressed by thermal averaging. In the
+absence of the Zeeman coupling the high-temperature tunneling conductance of
+the ring exhibits two types of oscillations: Aharonov-Bohm oscillations with
+magnetic flux and Aharonov-Casher oscillations with the strength of the
+spin-orbit interaction. For weak tunneling coupling both oscillations have the
+form of sharp periodic antiresonances. In the vicinity of the antiresonances
+the tunneling electrons acquire spin polarization, so that the ring serves as a
+spin polarizer. We also demonstrate that the Zeeman coupling leads to
+appearance of two additional peaks both in the tunneling conductance and in the
+spin polarization.",1110.6520v1
+2014-09-06,Buckled honeycomb lattice and unconventional magnetic response,"We study the magnetic response of buckled honeycomb-lattice materials. The
+buckling breaks the sublattice symmetry, enhances the spin-orbit coupling, and
+allows the tuning of a topological quantum phase transition. As a result, there
+are two doubly degenerate spin-valley coupled massive Dirac bands, which
+exhibit an unconventional Hall plateau sequence under strong magnetic fields.
+We show how to externally control the splitting of anomalous zeroth Landau
+levels, the prominent Landau level crossing effects, and the polarizations of
+spin, valley, and sublattice degrees of freedom. In particular, we reveal that
+in a p-n junction, spin-resolved fractionally quantized conductance appears in
+a two-terminal measurement with a spin-polarized current propagating along the
+interface. In the low-field regime where the Landau quantization is not
+applicable, we provide a semiclassical description for the anomalous Hall
+transport. We comment briefly on the effects of electron-electron interactions
+and Zeeman couplings to electron spins and to atomic orbitals.",1409.1977v1
+2015-02-16,Hanle Magnetoresistance in Thin Metal Films with Strong Spin-Orbit Coupling,"We report measurements of a new type of magnetoresistance in Pt and Ta thin
+films. The spin accumulation created at the surfaces of the film by the spin
+Hall effect decreases in a magnetic field because of the Hanle effect,
+resulting in an increase of the electrical resistance as predicted by Dyakonov
+[PRL 99, 126601 (2007)]. The angular dependence of this magnetoresistance
+resembles the recently discovered spin Hall magnetoresistance in Pt/Y3Fe5O12
+bilayers, although the presence of a ferromagnetic insulator is not required.
+We show that this Hanle magnetoresistance is an alternative, simple way to
+quantitatively study the coupling between charge and spin currents in metals
+with strong spin-orbit coupling.",1502.04624v2
+2015-03-06,Spin-Motive Forces and Current-Induced Torques in Ferromagnets,"In metallic ferromagnets, the spin-transfer torque and spin-motive force are
+known to exhibit a reciprocal relationship. Recent experiments on ferromagnets
+with strong spin-orbit coupling have revealed a rich complexity in the
+interaction between itinerant charge carriers and magnetization, but a full
+understanding of this coupled dynamics is lacking. Here, we develop a general
+phenomenology of the two reciprocal processes of charge pumping by spin-motive
+forces and current-driven magnetization dynamics. The formalism is valid for
+spin-orbit coupling of any strength and presents a systematic scheme for
+deriving all possible torque and charge-pumping terms that obey the symmetry
+requirements imposed by the point group of the system. We demonstrate how the
+different charge pumping and torque contributions are connected via the Onsager
+reciprocal relations. The formalism is applied to two important classes of
+systems: isotropic ferromagnets with non-uniform magnetization and homogeneous
+ferromagnets described by the point group $C_{2v}$.",1503.01899v2
+2016-02-02,Pseudospin induced chirality with Staggered Optical Graphene,"Pseudospin plays a very important role in understanding various interesting
+physical phenomena associated with 2D materials such as graphene. It has been
+proposed that pseudospin is directly related to angular momentum, and it was
+recently experimentally demonstrated that orbit angular momentum is an
+intrinsic property of pseudospin in a photonic honeycomb lattice. However, in
+photonics, the interaction between spin and pseudospin for light has never been
+investigated. In this Letter, we propose that, in an optical analogue of
+staggered graphene, i.e. a photonic honeycomb lattice waveguide with in-plane
+inversion symmetry breaking, the pseudospin mode can strongly couple to the
+spin of an optical beam incident along certain directions. The spin-pseudospin
+coupling, caused by the spin-orbit conversion in the scattering process,
+induces a strong optical chiral effect for the transmitted optical beam.
+Spin-pseudospin coupling of light opens door to the design of
+pseudospin-mediated spin or valley selective photonic devices.",1602.01014v1
+2020-07-13,Quenching dynamics of the bright solitons and other localized states in spin-orbit coupled Bose-Einstein condensates,"We study the dynamics of binary Bose-Einstein condensates made of ultracold
+and dilute alkali-metal atoms in a quasi-one-dimensional setting. Numerically
+solving the two coupled Gross-Pitaevskii equations which accurately describe
+the system dynamics, we demonstrate that the spin transport can be controlled
+by suitably quenching spin-orbit (SO) and Rabi coupling strengths. Moreover, we
+predict a variety of dynamical features induced by quenching: broken
+oscillations, breathers-like oscillating patterns, spin-mixing-demixing,
+miscible-immiscible transition, emerging dark-bright states, dark solitons, and
+spin-trapping dynamics. We also outline the experimental relevance of the
+present study in manipulating the spin states in $^{39}$K condensates.",2007.06171v1
+2017-04-21,Usadel equation in the presence of intrinsic spin-orbit coupling: A unified theory of magneto-electric effects in normal and superconducting systems,"The Usadel equation is the standard theoretical tool for the description of
+superconducting structures in the diffusive limit. Here I derive the Usadel
+equation for gyrotropic materials with a generic linear in momentum spin-orbit
+coupling. It accounts for the spin-charge/singlet-triplet coupling and in the
+normal state reduces to the system of spin-charge diffusion equations
+describing various magneto-electric effects, such as the spin Hall effect
+(SHE), the spin-galvanic effect (SGE) and their inverses. Therefore the derived
+Usadel equation establishes a direct connection of these effects to their
+superconducting counterparts. The working power of the present formalism is
+illustrated on the example of the bulk SGE.",1704.06451v1
+2017-11-09,"Spin-orbit coupling, optical transitions, and spin pumping in mono- and few-layer InSe","We show that spin-orbit coupling (SOC) in InSe enables the optical transition
+across the principal band gap to couple with in-plane polarized light. This
+transition, enabled by $p_{x,y}\leftrightarrow p_z$ hybridization due to
+intra-atomic SOC in both In and Se, can be viewed as a transition between two
+dominantly $s$- and $p_z$-orbital based bands, accompanied by an electron
+spin-flip. Having parametrized $\mathbf{k\cdot p}$ theory using first
+principles density functional theory we estimate the absorption for
+$\sigma^{\pm}$ circularly polarized photons in the monolayer as $\sim 1.5\%$,
+which saturates to $\sim 0.3\%$ in thicker films ($3-5$ layers). Circularly
+polarized light can be used to selectively excite electrons into spin-polarized
+states in the conduction band, which permits optical pumping of the spin
+polarization of In nuclei through the hyperfine interaction.",1711.03402v1
+2019-12-12,Strongly interacting spin-orbit coupled Bose-Einstein condensates in one dimension,"We theoretically study dilute superfluidity of spin-1 bosons with
+antiferromagnetic interactions and synthetic spin-orbit coupling (SOC) in a
+one-dimensional lattice. Employing a combination of density matrix
+renormalization group and quantum field theoretical techniques we demonstrate
+the appearance of a robust superfluid spin-liquid phase in which the
+spin-sector of this spinor Bose-Einstein condensate remains quantum disordered
+even after introducing quadratic Zeeman and helical magnetic fields. Despite
+remaining disordered, the presence of these symmetry breaking fields lifts the
+perfect spin-charge separation and thus the nematic correlators obey power-law
+behavior. We demonstrate that, at strong coupling, the SOC induces a charge
+density wave state that is not accessible in the presence of linear and
+quadratic Zeeman fields alone. In addition, the SOC induces oscillations in the
+spin and nematic expectation values as well as the bosonic Green's function.
+These non-trivial effects of a SOC are suppressed under the application of a
+large quadratic Zeeman field. We discuss how our results could be observed in
+experiments on ultracold gases of $^{23}$Na in an optical lattice.",1912.06142v1
+2020-05-21,Chemical Reaction Rates for Systems with Spin-Orbit Coupling and an Odd Number of Electrons: Does Berry's Phase Lead to Meaningful Spin-Dependent Nuclear Dynamics for a Two State Crossing?,"Within the context of very simple avoided crossing, we investigate the
+investigate the effect of a complex diabatic coupling in determining
+spin-dependent rate constants and scattering states. We find that, if the
+molecular geometry is not linear and the Berry force is not zero, one can find
+significant spin polarization of the products. This study emphasizes that, when
+analyzing nonadiabatic reactions with spin orbit coupling (and a complex
+Hamiltonian), one must consider how Berry force affects nuclear motion -- at
+least in the context of gas phase reactions. Work is currently ongoing as far
+as extrapolating these conclusions to the condensed phase where interesting
+spin selection has been observed in recent years.",2005.10424v1
+2020-06-10,Controlling spin without magnetic fields -- the Bloch-Rashba rotator,"We consider the dynamics of a quantum particle held in a lattice potential,
+and subjected to a time-dependent spin-orbit coupling. Tilting the lattice
+causes the particle to perform Bloch oscillations, and by suitably changing the
+Rashba interaction during its motion, the spin of the particle can be gradually
+rotated. Even if the Rashba coupling can only be altered by a small amount,
+large spin-rotations can be obtained by accumulating the rotation from
+successive oscillations. We show how the time-dependence of the spin-orbit
+coupling can be chosen to maximize the rotation per cycle, and thus how this
+method can be used to produce a precise and controllable spin-rotator, the
+Bloch-Rashba rotator, without requiring an applied magnetic field.",2006.06046v2
+2021-09-22,Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice,"We study multilevel fermions in an optical lattice described by the Hubbard
+model with on site SU($n$)-symmetric interactions. We show that in an
+appropriate parameter regime this system can be mapped onto a spin model with
+all-to-all SU($n$)-symmetric couplings. Raman pulses that address internal spin
+states modify the atomic dispersion relation and induce spin-orbit coupling,
+which can act as a synthetic inhomogeneous magnetic field that competes with
+the SU($n$) exchange interactions. We investigate the mean-field dynamical
+phase diagram of the resulting model as a function of $n$ and different initial
+configurations that are accessible with Raman pulses. Consistent with previous
+studies for $n=2$, we find that for some initial states the spin model exhibits
+two distinct dynamical phases that obey simple scaling relations with $n$.
+Moreover, for $n>2$ we find that dynamical behavior can be highly sensitive to
+initial intra-spin coherences. Our predictions are readily testable in current
+experiments with ultracold alkaline-earth(-like) atoms.",2109.11019v1
+2022-08-04,Giant chirality-induced spin-selectivity of polarons,"The chirality-induced spin selectivity (CISS) effect gives rise to strongly
+spin-dependent transport through many organic molecules and structures. Its
+discovery raises fascinating fundamental questions as well as the prospect of
+possible applications. The basic phenomenology, a strongly asymmetric
+magnetoresistance despite the absence of magnetism, is now understood to result
+from the combination of spin-orbit coupling and chiral geometry. However,
+experimental signatures of electronic helicity were observed at room
+temperature, i.e., at an energy scale that exceeds the typical spin-orbit
+coupling in organic systems by several orders of magnitude. This work shows
+that a new energy scale for CISS emerges for currents carried by polarons,
+i.e., in the presence of strong electron-phonon coupling. In particular, we
+found that polaron fluctuations play a crucial role in the two manifestations
+of CISS in transport measurements -- the spin-dependent transmission
+probability through the system and asymmetric magnetoresistance.",2208.02530v1
+2022-10-25,Exact solutions for a spin-orbit coupled bosonic double-well system,"Exact solutions for spin-orbit (SO) coupled cold atomic systems are very
+important and rare in physics. In this paper, we propose a simple method of
+combined modulations to generate the analytic exact solutions for an SO-coupled
+boson held in a driven double well. For the cases of synchronous combined
+modulations and the spin-conserving tunneling, we obtain the general analytical
+accurate solutions of the system respectively. For the case of spin-flipping
+tunneling under asynchronous combined modulations, we get the special exact
+solutions in simple form when the driving parameters satisfy certain
+conditions. Based on these obtained exact solutions, we reveal some intriguing
+quantum spin dynamical phenomena, for instance, the arbitrary population
+transfer (APT) with and/or without spin-flipping, the controlled coherent
+population conservation (CCPC), and the controlled coherent population
+inversion (CCPI). The results may have potential applications in the
+preparation of accurate quantum entangled states and quantum information
+processing.",2210.13724v1
+2023-05-02,i-SPin 2: An integrator for general spin-s Gross-Pitaevskii systems,"We provide an algorithm for evolving general spin-$s$ Gross-Pitaevskii /
+non-linear Schr\""odinger systems carrying a variety of interactions, where the
+$2s+1$ components of the `spinor' field represent the different
+spin-multiplicity states. We consider many nonrelativistic interactions up to
+quartic order in the Schr\""odinger field (both short and long-range, and
+spin-dependent and spin-independent interactions), including explicit
+spin-orbit couplings. The algorithm allows for spatially varying external
+and/or self-generated vector potentials that couple to the spin density of the
+field. Our work can be used for scenarios ranging from laboratory systems such
+as spinor Bose-Einstein condensates (BECs), to cosmological/astrophysical
+systems such as self-interacting bosonic dark matter. As examples, we provide
+results for two different setups of spin-$1$ BECs that employ a varying
+magnetic field and spin-orbit coupling, respectively, and also collisions of
+spin-$1$ solitons in dark matter. Our symplectic algorithm is second-order
+accurate in time, and is extensible to the known higher-order accurate methods.",2305.01675v1
+2023-10-12,Time-resolved Broadband Spectroscopy of Coherent Lattice Dynamics in a Rashba Material,"Spintronics aims at establishing an information technology relying on the
+spins of electrons. Key to this vision is the spin-to-charge conversion (and
+vice versa) enabled by spin-orbit coupling, which represents the intimate bond
+between spins and charges. Here, we set the foundations to manipulate the
+spin-orbit coupling in Rashba systems in a coherent way at THz frequencies
+without parasitic electronic dissipation. Our approach relies on the generation
+of coherent lattice dynamics in BiTeI. Using ultrashort laser pulses ranging
+from the visible to the mid-infrared spectral range we establish quantitatively
+the conditions for an effective generation of coherent THz phonons, with the
+required symmetry for a manipulation of the Rashba coupling. Furthermore, we
+conclude an open discussion on the possibility of photoinducing of a spin
+current in BiTeI, proving that this is not the case. We envision a direct
+application of our pumping scheme in a photoemission experiment, which can
+directly disclose the THz dynamics of the Rashba splitting.",2310.08411v1
+2007-09-07,Spin-orbit coupling effects in one-dimensional ballistic quantum wires,"We study the spin-dependent electronic transport through a one-dimensional
+ballistic quantum wire in the presence of Rashba spin-orbit interaction. In
+particular, we consider the effect of the spin-orbit interaction resulting from
+the lateral confinement of the two-dimensional electron gas to the
+one-dimensional wire geometry. We generalize a situation suggested earlier [P.
+Streda and P. Seba, Phys. Rev. Lett. 90, 256601 (2003)] which allows for
+spin-polarized electron transport. As a result of the lateral confinement, the
+spin is rotated out of the plane of the two-dimensional system. We furthermore
+investigate the spin-dependent transmission and the polarization of an electron
+current at a potential barrier. Finally, we construct a lattice model which
+shows similar low-energy physics. In the future, this lattice model will allow
+us to study how the electron-electron interaction affects the transport
+properties of the present setup.",0709.1057v2
+2008-06-24,Spin polarization control via magnetic barriers and spin-orbit effects,"We investigate the spin-dependent transport properties of two-dimensional
+electron gas (2DEG) systems formed in diluted magnetic semiconductors and in
+the presence of Rashba spin-orbit interaction in the framework of the
+scattering matrix approach. We focus on nanostructures consisting of realistic
+magnetic barriers produced by the deposition of ferromagnetic strips on
+heterostructures. We calculate spin-dependente conductance of such barrier
+systems and show that the magnetization pattern of the strips, the tunable
+spin-orbit coupling, and the enhanced Zeeman splitting have a strong effect on
+the conductance of the structure. We describe how these effects can be employed
+in the efficient control of spin polarization via the application of moderate
+fields.",0806.3967v1
+2009-06-11,The influence of the discretized Rashba spin-orbit interaction on the Harper model,"The movement of the electrons under the simultaneous influence of a scalar
+periodic potential and of a uniform transversal magnetic field is described by
+the well-known second order discrete Harper equation. This equation originates
+from a two-dimensional energy dispersion law under the minimal substitution.
+Here one deals with the Harper model under the additional influence of the
+discretized spin orbit interaction. Converting the spin-orbit interaction in
+terms of discrete derivatives opens the way for analytical and numerical
+studies. One finds coupled equations for the spin dependent wave functions,
+which leads to an appreciable alteration of the nested energy subbands
+characterizing the self-similar structure of the usual Harper spectrum. To this
+aim the transfer matrix method has been applied to selected spin-up and
+spin-down wavefunctions. Accordingly, very manifestations of spinfiltering and
+of spin correlations are accounted for. Our energy-bands calculations show that
+the splitting effect implemented by such wavefunctions is appreciable.",0906.2054v1
+2009-08-07,Lateral spin-orbit interaction and spin polarization in quantum point contacts,"We study ballistic transport through semiconductor quantum point contact
+systems under different confinement geometries and applied fields. In
+particular, we investigate how the {\em lateral} spin-orbit coupling,
+introduced by asymmetric lateral confinement potentials, affects the spin
+polarization of the current. We find that even in the absence of external
+magnetic fields, a variable {\em non-zero spin polarization} can be obtained by
+controlling the asymmetric shape of the confinement potential. These results
+suggest a new approach to produce spin polarized electron sources and we study
+the dependence of this phenomenon on structural parameters and applied magnetic
+fields. This asymmetry-induced polarization provides also a plausible
+explanation of our recent observations of a 0.5 conductance plateau (in units
+of $2e^2/h$) in quantum point contacts made on InAs quantum-well structures.
+Although our estimates of the required spin-orbit interaction strength in these
+systems do not support this explanation, they likely play a role in the effects
+enhanced by electron-electron interactions.",0908.1080v1
+2010-12-01,Spin orbit in curved graphene ribbons,"We study the electronic properties of electrons in flat and curved zigzag
+graphene ribbons using a tight-binding model within the Slater Koster
+approximation.
+  We find that curvature dramatically enhances the action of spin orbit effects
+in graphene ribbons and has a strong effect on the spin orientation of the edge
+states: whereas spins are normal to the surface in the case of flat ribbons,
+this is no longer the case in the case of curved ribbons. We find that for the
+edge states, the spin density lies always in the plane perpendicular to the
+ribbon axis, and deviate strongly from the normal to the ribbon, even for very
+small curvature and the small spin orbit coupling of carbon. We find that
+curvature results also in an effective second neighbor hopping that modifies
+the electronic properties of zigzag graphene ribbons. We discuss the
+implications of our finding in the spin Hall phase of curved graphene Ribbons.",1012.0228v1
+2012-08-30,Generation of spin-polarized current using multi-terminated quantum dot with spin-orbit interaction,"We theoretically examine generation of spin-polarized current using
+multi-terminated quantum dot with spin-orbit interaction. First, a two-level
+quantum dot is analyzed as a minimal model, which is connected to $N$ ($\ge 2$)
+external leads via tunnel barriers. When an unpolarized current is injected to
+the quantum dot from a lead, a polarized current is ejected to others,
+similarly to the spin Hall effect. In the absence of magnetic field, the
+generation of spin-polarized current requires $N \ge 3$. The polarization is
+markedly enhanced by resonant tunneling when the level spacing in the quantum
+dot is smaller than the level broadening due to the tunnel coupling to the
+leads. In a weak magnetic field, the orbital magnetization creates a
+spin-polarized current even in the two-terminal geometry (N=2). The numerical
+study for generalized situations confirms our analytical result using the
+two-level model.",1208.6084v1
+2012-10-24,Spin Current Generation as a Nonequilibrium Kondo Effect in a Spin-orbit Mesoscopic Interferometer,"We study nonequilibrium generation of spin-dependent transport through a
+single-level quantum dot embedded in a ring with the Rashba spin-orbit
+coupling. We consider nonmagnetic systems, involving no magnetic field nor
+ferromagnetic leads. It is theoretically predicted that large spin-dependent
+current occurs as a combined effect of the Rashba spin-orbit interaction, the
+Kondo effect, and nonequilibrium effect, without using magnetic field or
+material. The phenomenon is viewed as a new nonequilibrium correlation effect
+that disappears when either interaction or finite bias is absent. We show how
+the Kondo physics is connected with such emergent spin phenomenon by employing
+the finite interaction slave-boson approach.",1210.6428v1
+2017-03-22,Quantum spin Hall density wave insulator of correlated fermions,"We present the theory of a new type of topological quantum order which is
+driven by the spin-orbit density wave order parameter, and distinguished by
+$Z_2$ topological invariant. We show that when two oppositely polarized chiral
+bands [resulting from the Rashba-type spin-orbit coupling $\alpha_k$, $k$ is
+crystal momentum] are significantly nested by a special wavevector ${\bf
+Q}\sim(\pi,0)/(0,\pi)$, it induces a spatially modulated inversion of the
+chirality ($\alpha_{k+Q}=\alpha_k^*$) between different sublattices. The
+resulting quantum order parameters break translational symmetry, but preserve
+time-reversal symmetry. It is inherently associated with a $Z_2$-topological
+invariant along each density wave propagation direction. Hence it gives a weak
+topological insulator in two dimensions, with even number of spin-polarized
+boundary states. This phase is analogous to the quantum spin-Hall state, except
+here the time-reversal polarization is spatially modulated, and thus it is
+dubbed quantum spin-Hall density wave (QSHDW) state. This order parameter can
+be realized or engineered in quantum wires, or quasi-2D systems, by tuning the
+spin-orbit couping strength and chemical potential to achieve the special
+nesting condition.",1703.07629v1
+2017-08-23,Spin-orbit torques induced by interface-generated spin currents,"Magnetic torques generated through spin-orbit coupling promise
+energy-efficient spintronic devices. It is important for applications to
+control these torques so that they switch films with perpendicular
+magnetizations without an external magnetic field. One suggested approach uses
+magnetic trilayers in which the torque on the top magnetic layer can be
+manipulated by changing the magnetization of the bottom layer. Spin currents
+generated in the bottom magnetic layer or its interfaces transit the spacer
+layer and exert a torque on the top magnetization. Here we demonstrate
+field-free switching in such structures and attribute it to a novel spin
+current generated at the interface between the bottom layer and the spacer
+layer. The measured torque has a distinct dependence on the bottom layer
+magnetization which is consistent with this interface-generated spin current
+but not the anticipated bulk effects. This other interface-generated spin-orbit
+torque will enable energy-efficient control of spintronic devices.",1708.06864v1
+2017-06-20,Theory of non-collinear interactions beyond Heisenberg exchange; applications to bcc Fe,"We show for a simple non-collinear configuration of the atomistic spins (in
+particular, where one spin is rotated by a finite angle in a ferromagnetic
+background) that the pairwise energy variation computed in terms of multiple
+scattering formalism cannot be fully mapped onto a bilinear Heisen- berg spin
+model even in the lack of spin-orbit coupling. The non-Heisenberg terms induced
+by the spin-polarized host appear in leading orders in the expansion of the
+infinitesimal angle variations. However, an Eg-T2g symmetry analysis based on
+the orbital decomposition of the exchange param- eters in bcc Fe leads to the
+conclusion that the nearest neighbor exchange parameters related to the T2g
+orbitals are essentially Heisenberg-like: they do not depend on the spin
+configuration, and can in this case be mapped onto a Heisenberg spin model even
+in extreme non-collinear cases.",1706.06560v1
+2017-10-24,Electrical spin driving by $g$-matrix modulation in spin-orbit qubits,"In a semiconductor spin qubit with sizable spin-orbit coupling, coherent spin
+rotations can be driven by a resonant gate-voltage modulation. Recently, we
+have exploited this opportunity in the experimental demonstration of a hole
+spin qubit in a silicon device. Here we investigate the underlying physical
+mechanisms by measuring the full angular dependence of the Rabi frequency as
+well as the gate-voltage dependence and anisotropy of the hole $g$-factors. We
+show that a $g$-matrix formalism can simultaneously capture and discriminate
+the contributions of two mechanisms so far independently discussed in the
+literature: one associated with the modulation of the $g$ factors, and
+measurable by Zeeman energy spectroscopy, the other not. Our approach has a
+general validity and can be applied to the analysis of other types of
+spin-orbit qubits.",1710.08690v2
+2019-09-30,Magnetic circular dichroism in hard x-ray Raman scattering as a probe of local spin polarization,"We argue that the magnetic circular dichroism (MCD) of the hard x-ray Raman
+scattering (XRS) could be used as an element selective probe of local spin
+polarization. The magnitude of the XRS-MCD signal is directly proportional to
+the local spin polarization when the angle between the incident wavevector and
+the magnetization vector is $135^{\circ}$ or $-45^{\circ}$. By comparing the
+experimental observation and the configuration interaction calculation at the
+$L_{2,3}$ and $M_{2,3}$ edges of ferromagnetic iron, we suggest that the
+integrated MCD signal in terms of the transferred energy could be used to
+estimate the local spin moment even in the case where the application of the
+spin sum-rule in X-ray absorption is questionable. We also point out that
+XRS-MCD signal could be observed at the $M_{1}$ edge with a magnitude
+comparable to that at the $M_{2,3}$ edge, although the spin-orbit coupling is
+absent in the core orbital. By combining the XRS-MCD at various edges, spin
+polarization distribution depending on the orbital magnetic quantum number
+would be determined.",1909.13490v1
+2019-01-24,Non-equilibrium spin density and spin-orbit torque in three dimensional topological insulators - antiferromagnet heterostructure,"We study the behavior of non-equilibrium spin density and spin-orbit torque
+in a topological insulator - antiferromagnet heterostructure. Unlike
+ferromagnetic heterostructures where Dirac cone is gapped due to time-reversal
+symmetry breaking, here the Dirac cone is preserved. We demonstrate the
+existence of a staggered spin density corresponding to a damping like torque,
+which is quite robust against the scalar impurity, when the transport energy is
+in the topological insulator surface energy regime. We show the contribution to
+the non-equilibrium spin density due to both surface and bulk topological
+insulator bands. Finally, we show that the torques in topological
+insulator-antiferromagnet heterostructure exhibit an angular dependence that is
+consistent with the standard spin-orbit torque obtained in Rashba system with
+some additional nonlinear effects arising from the interfacial coupling.",1901.08314v1
+2019-08-15,Natural orbital functional for multiplets,"A natural orbital functional for electronic systems with any value of the
+spin is proposed. This energy functional is based on a new reconstruction for
+the two-particle reduced density matrix (2RDM) of the multiplet, that is, of
+the mixed quantum state that allows all possible spin projections. The mixed
+states of maximum spin multiplicity are considered. This approach differs from
+the methods routinely used in electronic structure calculations that focus on
+the high-spin component or break the spin symmetry. In the ensemble, there are
+no interactions between electrons with opposite spins in singly occupied
+orbitals, as well as new inter-pair alpha-beta-contributions are proposed in
+the 2RDM. The proposed 2RDM fulfills (2,2)-positivity necessary
+N-representability conditions and guarantees the conservation of the total
+spin. The NOF for multiplets is able to recover the non-dynamic and the
+intrapair dynamic electron correlation. The missing dynamic correlation is
+recovered by the NOF-MP2 method. Calculation of ionization potentials of the
+first-row transition-metal atoms is presented as test case. The values obtained
+agree with those reported at the coupled cluster singles and doubles level of
+theory with perturbative triples and experimental data.",1908.05501v1
+2020-10-02,Gravitational spin-orbit and aligned spin$_1$-spin$_2$ couplings through third-subleading post-Newtonian orders,"The study of scattering encounters continues to provide new insights into the
+general relativistic two-body problem. The local-in-time conservative dynamics
+of an aligned-spin binary, for both unbound and bound orbits, is fully encoded
+in the gauge-invariant scattering-angle function, which is most naturally
+expressed in a post-Minkowskian (PM) expansion, and which exhibits a remarkably
+simple dependence on the masses of the two bodies (in terms of appropriate
+geometric variables). This dependence links the PM and small-mass-ratio
+approximations, allowing gravitational self-force results to determine new
+post-Newtonian (PN) information to all orders in the mass ratio. In this paper,
+we exploit this interplay between relativistic scattering and self-force theory
+to obtain the third-subleading (4.5PN) spin-orbit dynamics for generic spins,
+and the third-subleading (5PN) spin$_1$-spin$_2$ dynamics for aligned spins. We
+further implement these novel PN results in an effective-one-body framework,
+and demonstrate the improvement in accuracy by comparing against
+numerical-relativity simulations.",2010.02018v2
+2022-03-20,Rashba spin-orbit coupling and quantum-interference effect for a pair of spin-correlated electrons in their tunneling and reflection under a step potential,"We present both theory and numerical-computation results for the transmission
+and reflection probability currents of a charged particle across a potential
+step in the presence of a Rashba spin-orbit interaction. By varying kinetic
+energy and angle of incident electrons or barrier height, different features
+associated with tunneling and reflection of electrons are revealed by
+inter-spin-channel electron tunnelings and reflections. These unique properties
+are further accompanied by spin-state quantum interference of either a
+reflected or transmitted pairs of spin-correlated electrons with the same
+kinetic energy but in different spin-orbital states. Such distinctive features
+are expected to give rise to a lot of applications in both spintronics and
+quantum-computation devices.",2203.10606v1
+2019-12-11,Magnetic field effects on electron transport in nanoring with orbital Rashba coupling,"We study the effects of a Zeeman magnetic field on the electron transport of
+one-dimensional quantum rings which are marked by electronic states with
+$d-$orbital symmetry in the presence of spin-orbit and orbital Rashba
+couplings. By considering phase-coherent propagation, we analyse the geometric
+Aharonov-Anandan (AA) phase of the channels which is acquired in a closed path,
+by demonstrating that the orbital polarization can influence the electronic
+transport when amplitude and magnetic field directions are varied. We explore
+all the possible cases for the injection of electrons at various energies in
+the regime of low electron filling. The magnetic field can allow the selection
+of only one channel where the transmission is uniquely affected by the AA
+phase. Conversely, when more orbital channels are involved there is also a
+dynamical contribution that lead to oscillations in the transmission as the
+magnetic field is varied. In particular, the transmission is chiral when the
+energy states are close to the absolute minimum of the energy bands. Instead,
+when an interference between the channels occurs the orbital and spin
+contributions tend to balance each other with the increasing of the magnetic
+field amplitude resulting in a trivial AA phase. This saturation effect does
+not occur in the high magnetic field regime when orbital and spin properties of
+the channels exhibit sharp variations with direct consequences on the
+transport.",1912.05602v1
+2021-07-06,Comparing the effective enhancement of local and non-local spin-orbit couplings on honeycomb lattices due to strong electronic correlations,"We investigate the interplay of electronic correlations and spin-orbit
+coupling (SOC) for a one-band and a two-band honeycomb lattice model. The main
+difference between the two models concerning SOC is that in the one-band case
+the SOC is a purely non-local term in the basis of the $p_z$ orbitals, whereas
+in the two-band case with $p_x$ and $p_y$ as basis functions it is purely
+local. In order to grasp the correlation effects on non-local spin-orbit
+coupling, we apply the TRILEX approach that allows to calculate non-local
+contributions to the self-energy approximatively. For the two-band case we
+apply dynamical mean-field theory. In agreement with previous studies, we find
+that for all parameter values in our study, the effect of correlations on the
+spin-orbit coupling strength is that the bare effective SOC parameter is
+increased. However, this increase is much weaker in the non-local than in the
+local SOC case. Concerning the TRILEX method, we introduce the necessary
+formulas for calculations with broken SU(2) symmetry.",2107.02576v2
+2001-10-10,Charge and Orbital Ordering in the Triangular-Lattice t_{2g}-Orbital System in One Dimension: A Possible Ground State of Bi_xV_8O_{16},"We consider the possible charge and orbital ordering in a Hollandite compound
+Bi_xV_8O_{16}, which is a new one-dimensional triangular-lattice t_{2g}-orbital
+system. Using the strong-coupling perturbation theory, we derive the effective
+spin-orbit Hamiltonian in the approximation neglecting the small off-diagonal
+hopping parameters or orbital fluctuation, whereby we obtain the spin
+Hamiltonians in the partial space of each orbital-ordering pattern. We then
+apply an exact-diagonalization technique on small clusters to these spin
+Hamiltonians and calculate the ground-state phase diagram. We find that a
+variety of orbital-ordering patterns appear in the parameter space, which
+include the state characterized by the partial singlet formation consistent
+with recent NMR experiment.",0110197v1
+2020-01-02,Emergence of Superconductivity in Doped Multiorbital Hubbard Chains,"We introduce a variational state for one-dimensional two-orbital Hubbard
+models that intuitively explains the recent computational discovery of pairing
+in these systems when hole doped. Our Ansatz is an optimized linear
+superposition of Affleck-Kennedy-Lieb-Tasaki valence bond states, rendering the
+combination a valence bond liquid dubbed Orbital Resonant Valence Bond. We show
+that the undoped (one electron/orbital) quantum state of two sites coupled into
+a global spin singlet is exactly written employing only spin-1/2 singlets
+linking orbitals at nearest-neighbor sites. Generalizing to longer chains
+defines our variational state visualized geometrically expressing our chain as
+a two-leg ladder, with one orbital per leg. As in Anderson's resonating
+valence-bond state, our undoped variational state contains preformed singlet
+pairs that via doping become mobile leading to superconductivity. Doped real
+materials with one-dimensional substructures, two near-degenerate orbitals, and
+intermediate Hubbard U/W strengths -- W the carrier's bandwidth -- could
+realize spin-singlet pairing if on-site anisotropies are small. If these
+anisotropies are robust, spin-triplet pairing emerges.",2001.00589v2
+2015-03-05,Spin-Orbit-Induced Orbital Excitations in Sr2RuO4 and Ca2RuO4: A Resonant Inelastic X-ray Scattering Study,"High-resolution resonant inelastic X-ray scattering (RIXS) at the oxygen
+K-edge has been used to study the orbital excitations of Ca2RuO4 and Sr2RuO4.
+In combination with linear dichroism X-ray absorption spectroscopy, the
+ruthenium 4d-orbital occupation and excitations were probed through their
+hybridization with the oxygen p-orbitals. These results are described within a
+minimal model, taking into account crystal field splitting and a spin-orbit
+coupling \lambda_{so}=200~meV. The effects of spin-orbit interaction on the
+electronic structure and implications for the Mott and superconducting ground
+states of (Ca,Sr)2RuO4 are discussed.",1503.01574v2
+2009-12-11,"Orbital order, stacking defects and spin-fluctuations in the $p$-electron molecular solid RbO$_2$","We examine magnon and orbiton behavior in localized O$_2$ anti-bonding
+molecular $\pi^*$ orbitals using an effective Kugel-Khomskii Hamiltonian
+derived from a two band Hubbard model with hopping parameters taken from {\em
+ab initio} density functional calculations. The considerable difference between
+intraband and interband hoppings leads to a strong coupling between the spin
+wave dispersion and the orbital ground state, providing a straightforward way
+of experimentally determining the orbital ground state from the measured magnon
+dispersion. The near degeneracy of different orbital ordered states leads to
+stacking defects which further modulate spin-fluctuation spectra. Proliferation
+of orbital domains disrupts long-range magnetic order, thus causing a
+significant reduction in the observed N\'eel temperature.",0912.2334v2
+2017-06-30,Photoinduced Hund excitons in the breakdown of a two-orbital Mott insulator,"We study the photoinduced breakdown of a two-orbital Mott insulator and
+resulting metallic state. Using time-dependent density matrix renormalization
+group, we scrutinize the real-time dynamics of the half-filled two-orbital
+Hubbard model interacting with a resonant radiation field pulse. The breakdown,
+caused by production of doublon-holon pairs, is enhanced by Hund's exchange,
+which dynamically activates large orbital fluctuations. The melting of the Mott
+insulator is accompanied by a high to low spin transition with a concomitant
+reduction of antiferromagnetic spin fluctuations. Most notably, the overall
+time response is driven by the photogeneration of excitons with orbital
+character that are stabilized by Hund's coupling. These unconventional ""Hund
+excitons"" correspond to bound spin-singlet orbital-triplet doublon-holon pairs.
+We study exciton properties such as bandwidth, binding potential, and size
+within a semiclassical approach. The photometallic state results from a
+coexistence of Hund excitons and doublon-holon plasma.",1706.10247v2
+2017-04-29,Resonant inelastic x-ray scattering operators for $t_{2g}$ orbital systems,"We derive general expressions for resonant inelastic x-ray scattering (RIXS)
+operators for $t_{2g}$ orbital systems, which exhibit a rich array of
+unconventional magnetism arising from unquenched orbital moments. Within the
+fast collision approximation, which is valid especially for 4$d$ and 5$d$
+transition metal compounds with short core-hole lifetimes, the RIXS operators
+are expressed in terms of total spin and orbital angular momenta of the
+constituent ions. We then map these operators onto pseudospins that represent
+spin-orbit entangled magnetic moments in systems with strong spin-orbit
+coupling. Applications of our theory to such systems as iridates and ruthenates
+are discussed, with a particular focus on compounds based on $d^4$ ions with
+Van Vleck-type nonmagnetic ground state.",1705.00215v2
+2008-08-22,"Lattice Properties of PbX (X = S, Se, Te): Experimental Studies and ab initio Calculations Including Spin-Orbit Effects","During the past five years the low temperature heat capacity of simple
+semiconductors and insulators has received renewed attention. Of particular
+interest has been its dependence on isotopic masses and the effect of spin-
+orbit coupling in ab initio calculations. Here we concentrate on the lead
+chalcogenides PbS, PbSe and PbTe. These materials, with rock salt structure,
+have different natural isotopes for both cations and anions, a fact that allows
+a systematic experimental and theoretical study of isotopic effects e.g. on the
+specific heat. Also, the large spin-orbit splitting of the 6p electrons of Pb
+and the 5p of Te allows, using a computer code which includes spin-orbit
+interaction, an investigation of the effect of this interaction on the phonon
+dispersion relations and the temperature dependence of the specific heat and on
+the lattice parameter. It is shown that agreement between measurements and
+calculations significantly improves when spin-orbit interaction is included.",0808.3152v1
+2011-07-15,Orbital degeneracy and Mott transition in Mo pyrochlore oxides,"We present our theoretical results on an effective two-band double-exchange
+model on a pyrochlore lattice for understanding intricate phase competition in
+Mo pyrochlore oxides. The model includes the twofold degeneracy of $e_g'$
+orbitals under trigonal field splitting, the interorbital Coulomb repulsion,
+the Hund's-rule coupling between itinerant $e_g'$ electrons and localized
+$a_{1g}$ spins, and the superexchange antiferromagnetic interaction between the
+$a_{1g}$ spins. By Monte Carlo simulation with treating the Coulomb repulsion
+at an unrestricted-type mean-field level, we obtain the low-temperature phase
+diagram as functions of the Coulomb repulsion and the superexchange
+interaction. The results include four dominant phases with characteristic spin
+and orbital orders and the metal-insulator transitions among them. The
+insulating region is characterized by a `ferro'-type orbital ordering of the
+$e_g'$ orbitals along the local $<111>$ axis, irrespective of the spin
+ordering.",1107.2986v1
+2016-04-26,Modulated spin helicity stabilized by incommensurate orbital density waves in a quadruple perovskite manganite,"Through a combination of neutron diffraction and Landau theory we describe
+the spin ordering in the ground state of the quadruple perovskite manganite
+CaMn7O12 - a magnetic multiferroic supporting an incommensurate orbital density
+wave that onsets above the magnetic ordering temperature, TN1 = 90 K. The
+multi-k magnetic structure in the ground state was found to be a
+nearly-constant-moment helix with modulated spin helicity, which oscillates in
+phase with the orbital occupancies on the Mn3+ sites via trilinear
+magneto-orbital coupling. Our phenomenological model also shows that, above TN2
+= 48 K, the primary magnetic order parameter is locked into the orbital wave by
+an admixture of helical and collinear spin density wave structures.
+Furthermore, our model naturally explains the lack of a sharp dielectric
+anomaly at TN1 and the unusual temperature dependence of the electrical
+polarisation.",1604.07747v1
+2016-06-07,Full Stark Control of Polariton States on a Spin-Orbit Hypersphere,"The orbital angular momentum and the polarisation of light are physical
+quantities widely investigated for classical and quantum information
+processing. In this work we propose to take advantage of strong light-matter
+coupling, circular-symmetric confinement, and transverse-electric
+transverse-magnetic splitting to exploit states where these two degrees of
+freedom are combined. To this end we develop a model based on a spin-orbit
+Poincar\'{e} hypersphere. Then we consider the example of semiconductor
+polariton systems and demonstrate full ultrafast Stark control of spin-orbit
+states. Moreover, by controlling states on three different spin-orbit spheres
+and switching from one sphere to another we demonstrate the control of
+different logic bits within one single physical system.",1606.02335v2
+2017-07-31,Orbital-selective thermalization plateau in the mass imbalanced Hubbard model,"We use time-dependent non-equilibrium dynamical mean-field theory with
+weak-coupling auxiliary-field continuous time quantum Monte Carlo as an
+impurity solver to study the thermalization behavior of the mass-imbalanced
+single-band Hubbard model after a quench of the Coulomb interaction from the
+non-interacting limit to a finite positive value. By contrast, when the Coulomb
+interaction in our model is increased under equilibrium conditions, the
+quasi-particle weight for spin-up and spin-down (the mass imbalance) electrons
+approach zero simultaneously, indicating the absence of an orbital selective
+Mott transition. Our out-of-equilibrium study suggests that there exists a time
+window where an orbital selective dynamical phase transition occurs. The
+dynamical phase transition is characterized by the relaxation behavior of
+energy (kinetic and Coulomb interaction) and the spin-resolved
+momentum-dependent occupation. To make connection with possible experiments, we
+calculate the spin-resolved two-time optical conductivity, which confirms the
+orbital-selective thermalization plateau. We find the time window for the
+orbital selective dynamical phase transition grows as the mass imbalance
+increases.",1707.09692v2
+2018-01-26,Enhancement of Superconducting $T_c$ due to the Spin-orbit Interaction,"We calculate the superconducting $T_c$ for a system which experiences Rashba
+spin-orbit interactions. Contrary to the usual case where the electron-electron
+interaction is assumed to be wave vector-independent, where superconductivity
+is suppressed by the spin-orbit interaction (except for a small region at low
+electron or hole densities), we find an enhancement of the superconducting
+transition temperature when we include a correlated hopping interaction between
+electrons. This interaction originates in the expansion of atomic orbitals due
+to electron-electron repulsion and gives rise to superconductivity only at high
+electron (low hole) densities. When superconductivity results from this
+interaction it is enhanced by spin-orbit coupling, in spite of a suppression of
+the density of states. The degree of electron-hole asymmetry about the Fermi
+surface is also enhanced.",1801.08988v2
+2021-02-03,Spatiotemporal Vortex Pulses: Angular Momenta and Spin-Orbit Interaction,"Recently, spatiotemporal optical vortex pulses carrying a purely transverse
+intrinsic orbital angular momentum were generated experimentally [{\it Optica}
+{\bf 6}, 1547 (2019); {\it Nat. Photon.} {\bf 14}, 350 (2020)]. However, an
+accurate theoretical analysis of such states and their angular-momentum
+properties remains elusive. Here we provide such analysis, including scalar and
+vector spatiotemporal Bessel-type solutions as well as descrption of their
+propagational, polarization, and angular-momentum properties. Most importantly,
+we calculate both local densities and integral values of the spin and orbital
+angular momenta, and predict observable spin-orbit interaction phenomena
+related to the coupling between the trasnverse spin and orbital angular
+momentum. Our analysis is readily extended to spatiotemporal vortex pulses of
+other natures (e.g., acoustic).",2102.02180v2
+2013-07-23,Microscopic origin of spin-orbital separation in Sr2CuO3,"Recently performed resonant inelastic x-ray scattering experiment (RIXS) at
+the copper L3 edge in the quasi-1D Mott insulator Sr2CuO3 has revealed a
+significant dispersion of a single orbital excitation (orbiton). This large and
+unexpected orbiton dispersion has been explained using the concept of
+spin-orbital fractionalization in which orbiton, which is intrinsically coupled
+to the spinon in this material, liberates itself from the spinon due to the
+strictly 1D nature of its motion. Here we investigate this mechanism in detail
+by: (i) deriving the microscopic spin-orbital superexchange model from the
+charge transfer model for the CuO3 chains in Sr2CuO3, (ii) mapping the orbiton
+motion in the obtained spin-orbital model into a problem of a single hole
+moving in an effective half-filled antiferromagnetic chain t-J model, and (iii)
+solving the latter model using the exact diagonalization and obtaining the
+orbiton spectral function. Finally, the RIXS cross section is calculated based
+on the obtained orbiton spectral function and compared with the RIXS
+experiment.",1307.6180v3
+2015-04-13,Insensitivity of spin dynamics to the orbital angular momentum transferred from twisted light to extended semiconductors,"We study the spin dynamics of carriers due to the Rashba interaction in
+semiconductor quantum disks and wells after excitation with light with orbital
+angular momentum. We find that although twisted light transfers orbital angular
+momentum to the excited carriers and the Rashba interaction conserves their
+total angular momentum, the resulting electronic spin dynamics is essentially
+the same for excitation with light with orbital angular momentum $l=+|l|$ and
+$l=-|l|$. The differences between cases with different values of $|l|$ are due
+to the excitation of states with slightly different energies and not to the
+different angular momenta per se, and vanish for samples with large radii where
+a $k$-space quasi-continuum limit can be established. These findings apply not
+only to the Rashba interaction but also to all other envelope-function
+approximation spin-orbit Hamiltonians like the Dresselhaus coupling.",1504.03098v1
+2018-02-08,Manipulating Anomalous Hall Antiferromagnets with Magnetic Fields,"The symmetry considerations that imply a non-zero anomalous Hall effect (AHE)
+in certain non-collinear antiferromagnets also imply both non-zero orbital
+magnetization and a net spin magnetization. We have explicitly evaluated the
+orbital magnetizations of several anomalous Hall effect antiferromagnets and
+find that they tend to dominate over spin magnetizations, especially so when
+spin-orbit interactions are weak. Because of the greater relative importance of
+orbital magnetization the coupling between magnetic order and an external
+magnetic field is unusual. We explain how magnetic fields can be used to
+manipulate magnetic configurations in these systems, pointing in particular to
+the important role played by the response of orbital magnetization to the
+Zeeman-like spin exchange fields.",1802.03044v2
+2023-09-26,Spin-orbit excitons in a correlated metal: Raman scattering study of Sr2RhO4,"Using Raman spectroscopy to study the correlated 4$d$-electron metal
+Sr$_2$RhO$_4$, we observe pronounced excitations at 220 meV and 240 meV with
+$A_\mathrm{1g}$ and $B_\mathrm{1g}$ symmetries, respectively. We identify them
+as transitions between the spin-orbit multiplets of the Rh ions, in close
+analogy to the spin-orbit excitons in the Mott insulators Sr$_2$IrO$_4$ and
+$\alpha$-RuCl$_3$. This observation provides direct evidence for the unquenched
+spin-orbit coupling in Sr$_2$RhO$_4$. A quantitative analysis of the data
+reveals that the tetragonal crystal field $\Delta$ in Sr$_2$RhO$_4$ has a sign
+opposite to that in insulating Sr$_2$IrO$_4$, which enhances the planar $xy$
+orbital character of the effective $J=1/2$ wave function. This supports a
+metallic ground state, and suggests that $c$-axis compression of Sr$_2$RhO$_4$
+may transform it into a quasi-two-dimensional antiferromagnetic insulator.",2309.15299v2
+2016-06-27,Effect of the inter-subband spin-orbit interaction on the spin transistor operation,"We consider the electron transport in the Datta-Das spin transistor within
+the two-subband model taking into account the intra- and inter-subband
+spin-orbit (SO) interaction and study the influence of the inter-subband SO
+coupling on the spin-transistor operation. Starting from the model, in which
+the SO coupling constants are treated as parameters, we show that the
+inter-subband SO interaction strongly affects the ordinary conductance
+oscillations predicted for the transistor with the single occupancy.
+Interestingly, we find that even in the absence of the intra-subband SO
+interaction, the conductance oscillates as a function of the inter-subband SO
+coupling constant. This phenomenon is explained as resulting from the
+inter-subband transition with spin-flip. Next, we consider the realistic spin
+transistor model based on the gated
+Al$_{0.48}$In$_{0.52}$As/Ga$_{0.47}$In$_{0.53}$As double quantum well, for
+which the SO coupling constants are determined by the Schr\""{o}dinger-Poisson
+approach. We show that the SO coupling constants rapidly change around $V_g=0$,
+which is desirable for the spin transistor operation. We demonstrate that for
+high electron densities the inter-subband SO interaction starts to play the
+dominant role. The strong evidence of this interaction is the reduction of the
+conductance for gate voltage $V_g=0$, which leads to the reduction of the
+on/off conductance ratio.",1606.08202v1
+2023-10-10,Self-induced inverse spin Hall effect in La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ films,"The efficient generation of spin currents and spin torques via spin-orbit
+coupling is an important goal of spintronics research. One crucial metric for
+spin current generation is the spin Hall angle, which is the ratio of the spin
+Hall current to the transversely flowing charge current. A typical approach to
+measure the spin Hall angle in nonmagnetic materials is to generate spin
+currents via spin pumping in an adjacent ferromagnetic layer and measure the
+transverse voltage from the inverse spin Hall effect in the nonmagnetic layer.
+However, given that the spin Hall effect also occurs in ferromagnets, single
+ferromagnetic layers could generate a self-induced transverse voltage during
+spin pumping as well. Here we show that manganite based
+La$_{0.67}$Sr$_{0.33}$MnO$_{3}$ (LSMO) films deposited by pulsed laser
+deposition exhibit a significant self-induced inverse spin Hall voltage while
+undergoing spin pumping. We observe efficient spin to charge conversion in the
+LSMO films via the inverse spin Hall effect. A spin pumping voltage of 1.86
+$\mu$V is observed in the LSMO (12 nm) film. Using density functional theory
+and the Kubo formalism, we calculate the intrinsic spin current conductivities
+of these films and show that they are in reasonable agreement with the
+experimental measurements.",2310.06967v1
+2014-04-09,"Spin-orbit coupling in octamers in a spinel sulfide CuIr$_2$S$_4$: Competition between spin-singlet and quadrupolar states, and its relevance to remnant paramagnetism","We theoretically investigate magnetic properties in the low-temperature phase
+with the formation of eight-site clusters, octamers, in the spinel compound
+CuIr$_2$S$_4$. The octamer state was considered to be a spin-singlet state
+induced by a Peieirls instability through the strong anisotropy of $d$
+orbitals, the so-called orbital Peierls state. We reexamine this picture by
+taking into account the spin-orbit coupling which was ignored in the previous
+study. We derive a low-energy effective model between $j_{\rm eff}=1/2$
+quasispins on Ir$^{4+}$ cations in an octamer from the multiorbital Hubbard
+model with the strong spin-orbit coupling by performing the perturbation
+expansion from the strong correlation limit. The effective Hamiltonian is in
+the form of the Kitaev-Heisenberg model but with an additional interaction, a
+symmetric off-diagonal exchange interaction originating from the perturbation
+process including both d-d and d-p-d hopping. Analyzing the effective
+Hamiltonian on two sites and the octamer by the exact diagonalization, we find
+that there is a competition between a spin-singlet state and a quadrupolar
+state. The former singlet state is a conventional one, adiabatically connected
+to the orbital-Peierls state. On the other hand, the latter quadrupolar state
+is stabilized by the additional interaction, which consists of a linear
+combination of different total spin momenta along the spin quantization axis.
+In the competing region, the model exhibits paramagnetic behavior with a
+renormalized small effective moment at low temperature. This peculiar remnant
+paramagnetism is not obtained in the Kitaev-Heisenberg model without the
+additional interaction. Our results renew the picture of the octamer state and
+provide a scenario for the intrinsic paramagnetic behavior recently observed in
+a muon spin rotation experiment [K. M. Kojima et al., Phys. Rev. Lett. 112,
+087203 (2014)].",1404.2426v1
+2023-07-03,Effects of spin-orbit coupling on gravitational waveforms from a triaxial non-aligned neutron star in a binary system,"Spinning neutron stars (NSs) can emit continuous gravitational waves (GWs)
+that carry a wealth of information about the compact object. If such a signal
+is detected, it will provide us with new insight into the physical properties
+of matter under extreme conditions. Future space-based GW detectors, such as
+LISA and TianQin, can potentially detect some double NSs in tight binaries with
+orbital periods shorter than 10 minutes. The possibility of a successful
+directed search for continuous GWs from the spinning NS in such a binary system
+identified by LISA/TianQin will be significantly increased with the proposed
+next-generation ground-based GW observatories, such as Cosmic Explorer and
+Einstein Telescope. Searching for continuous GWs from such a tight binary
+system requires highly accurate waveform templates that account for the
+interaction of the NS with its companion. In this spirit, we derive analytic
+approximations that describe the GWs emitted by a triaxial non-aligned NS in a
+binary system in which the effects of spin-orbit coupling have been
+incorporated. The difference with the widely used waveform for the isolated NS
+is estimated and the parameter estimation accuracy of an example signal using
+Cosmic Explorer is calculated. For a typical tight double NS system with a
+6~min orbital period, the angular frequency correction of the spinning NS in
+this binary due to spin precession is $\sim 10^{-6}~{\rm Hz}$, which is in the
+same order of magnitude as the angular frequency of orbital precession. The
+fitting factor between the waveforms with and without spin precession will drop
+to less than 0.97 after a few days ($\sim 10^5~{\rm s}$). We find that
+spin-orbit coupling has the potential to improve the accuracy of parameter
+estimation, especially for the binary inclination angle and spin precession
+cone opening angle, by up to 3 orders of magnitude. (Abridged)",2307.01055v2
+2020-04-01,Interlayer exchange coupling through Ir-doped Cu spin Hall material,"Metallic superlattices where the magnetization vectors in the adjacent
+ferromagnetic layers are antiferromagnetically coupled by the interlayer
+exchange coupling through nonmagnetic spacer layers are systems available for
+the systematic study on antiferromagnetic (AF) spintronics. As a candidate of
+nonmagnetic spacer layer material exhibiting remarkable spin Hall effect, which
+is essential to achieve spin-orbit torque switching, we selected the Ir-doped
+Cu in this study. The AF-coupling for the Co / Cu$_{95}$Ir$_{5}$ / Co was
+investigated, and was compared with those for the Co / Cu / Co and Co / Ir /
+Co. The maximum magnitude of AF-coupling strength was obtained to be 0.39
+mJ/m$^{2}$ at the Cu$_{95}$Ir$_{5}$ thickness of about 0.75 nm. Furthermore, we
+found a large spin Hall angle of Cu$_{95}$Ir$_{5}$ in Co / Cu$_{95}$Ir$_{5}$
+bilayers by carrying out spin Hall magnetoresistance and harmonic Hall voltage
+measurements, which are estimated to be 3 ~ 4 %. Our experimental results
+clearly indicate that Cu$_{95}$Ir$_{5}$ is a nonmagnetic spacer layer allowing
+us to achieve moderately strong AF-coupling and to generate appreciable
+spin-orbit torque via the spin Hall effect.",2004.00739v1
+2012-05-08,Properties of edge states in spin-triplet two-band superconductor,"Motivated by Sr2RuO4 the magnetic properties of edge states in a two-band
+spin-triplet superconductor with electron- and hole-like Fermi surfaces are
+investigated assuming chiral p-wave pairing symmetry. The two bands correspond
+to the alpha-beta-bands of Sr2RuO4 and are modeled within a tight-binding model
+including inter-orbital hybridization and spin-orbit coupling effects.
+Including superconductivity the quasiparticle spectrum is determined by means
+of a self-consistent Bogolyubov-de Gennes calculation. While a full
+quasiparticle excitation gap appears in the bulk, gapless states form at the
+edges which produce spontaneous spin and/or charge currents. The spin current
+is the result of the specific band structure while the charge current
+originates from the superconducting condensate. Together they induce a small
+spin polarization at the edge. Furthermore onsite Coulomb repulsion is included
+to show that the edge states are unstable against the formation of a
+Stoner-like spin polarization of the edge states. Through spin-orbit coupling
+the current- and the correlation-induced magnetism are coupled to the
+orientation of the chirality of the superconducting condensate. We speculate
+that this type of phenomenon could yield a compensation of the magnetic fields
+induced by currents and also explain the negative result in the recent
+experimental search for chiral edge currents.",1205.1591v1
+2005-06-18,Quadratic response theory for spin-orbit coupling in semiconductor heterostructures,"This paper examines the properties of the self-energy operator in
+lattice-matched semiconductor heterostructures, focusing on nonanalytic
+behavior at small values of the crystal momentum, which gives rise to
+long-range Coulomb potentials. A nonlinear response theory is developed for
+nonlocal spin-dependent perturbing potentials. The ionic pseudopotential of the
+heterostructure is treated as a perturbation of a bulk reference crystal, and
+the self-energy is derived to second order in the perturbation. If spin-orbit
+coupling is neglected outside the atomic cores, the problem can be analyzed as
+if the perturbation were a local spin scalar, since the nonlocal spin-dependent
+part of the pseudopotential merely renormalizes the results obtained from a
+local perturbation. The spin-dependent terms in the self-energy therefore fall
+into two classes: short-range potentials that are analytic in momentum space,
+and long-range nonanalytic terms that arise from the screened Coulomb potential
+multiplied by a spin-dependent vertex function. For an insulator at zero
+temperature, it is shown that the electronic charge induced by a given
+perturbation is exactly linearly proportional to the charge of the perturbing
+potential. These results are used in a subsequent paper to develop a
+first-principles effective-mass theory with generalized Rashba spin-orbit
+coupling.",0506465v2
+2010-04-28,Spin-orbit coupling and broken spin degeneracy in multilayer graphene,"Since the lattices of ABA-stacked graphene multilayers with an even number of
+layers, as well as that of monolayer graphene, satisfy spatial-inversion
+symmetry, their electronic bands must be spin degenerate in the presence of
+time-inversion symmetry. In intrinsic monolayer and bilayer graphene, when
+symmetry is not broken by external fields, the only spin-orbit coupling present
+at low energy near the corner of the Brillouin zone is the Kane-Mele term, that
+opens a bulk energy gap but does not break the spin degeneracy of the energy
+bands [C. L. Kane and E. J. Mele, Phys. Rev. Lett. 95, 226801 (2005)]. However,
+spin splitting is allowed in multilayers with an odd number of layers (greater
+than or equal to 3) because their lattices do not satisfy spatial inversion
+symmetry. We show that, in trilayer graphene, in addition to the Kane-Mele
+term, there is a second type of intrinsic spin-orbit coupling present at low
+energy near the corner of the Brillouin zone. It introduces a Zeeman-like spin
+splitting of the energy bands at each valley, with an opposite sign of the
+effective magnetic field in the two valleys. We estimate the magnitude of the
+effective field to be ~2T.",1004.5083v1
+2012-06-05,Effective theory of fractional topological insulators in two spatial dimensions,"Electrons subjected to a strong spin-orbit coupling in two spatial dimensions
+could form fractional incompressible quantum liquids without violating the
+time-reversal symmetry. Here we construct a Lagrangian description of such
+fractional topological insulators by combining the available experimental
+information on potential host materials and the fundamental principles of
+quantum field theory. This Lagrangian is a Landau-Ginzburg theory of spinor
+fields, enhanced by a topological term that implements a state-dependent
+fractional statistics of excitations whenever both particles and vortices are
+incompressible. The spin-orbit coupling is captured by an external static SU(2)
+gauge field. The presence of spin conservation or emergent U(1) symmetries
+would reduce the topological term to the Chern-Simons effective theory tailored
+to the ensuing quantum Hall state. However, the Rashba spin-orbit coupling in
+solid-state materials does not conserve spin. We predict that it can
+nevertheless produce incompressible quantum liquids with topological order but
+without a quantized Hall conductivity. We discuss two examples of such liquids
+whose description requires a generalization of the Chern-Simons theory. One is
+an Abelian Laughlin-like state, while the other has a new kind of non-Abelian
+many-body entanglement. Their quasiparticles exhibit fractional spin-dependent
+exchange statistics, and have fractional quantum numbers derived from the
+electron's charge and spin according to their transformations under
+time-reversal. In addition to conventional phases of matter, the proposed
+topological Lagrangian can capture a broad class of hierarchical Abelian and
+non-Abelian topological states, involving particles with arbitrary spin or
+general emergent SU(N) charges.",1206.1055v2
+2019-11-04,Spin-helix driven insulating phase in two dimensional lattice,"Motivated by emergent $SU(2)$ symmetry in the spin orbit coupled system, we
+study the spin helix driven insulating phase in two dimensional lattice. When
+both Rashba and Dresselhaus spin orbit couplings are present, the perfect Fermi
+surface nesting occurs at a special condition depending on the lattice
+geometry. In this case, the energies of spin up at any wave vector $\vec{k}$
+are equivalent to the ones of spin down at $\vec{k}\!+\!\vec{Q}$ with so-called
+the \textit{shifting wave vector} $\vec{Q}$. Thus, the system stabilizes
+magnetic insulator with spiral like magnetic ordering even in the presence of
+tiny electron-electron interaction where the magnetic ordering wave vector is
+proportional to $\vec{Q}$. We first show the condition for existence of the
+\textit{shifting wave vector} in general lattice model and emergent $SU(2)$
+symmetry in the spin orbit coupled system. Then, we exemplify this in square
+lattice at half filling and discuss the insulating phase with (non-) coplanar
+spin density wave and charge order. Our study emphasizes possible new types of
+two dimensional magnetic materials and can be applicable to various van-der
+Waals materials and their heterostructures with the control of electric field,
+strain and pressure.",1911.01440v1
+2021-06-14,Spin-pure Stochastic-CASSCF via GUGA-FCIQMC applied to Iron Sulfur Clusters,"In this work we demonstrate how to compute the one- and two-body reduced
+density matrices within the spin-adapted full configuration interaction quantum
+Monte Carlo (FCIQMC) method, which is based on the graphical unitary group
+approach (GUGA). This allows us to use GUGA-FCIQMC as a spin-pure configuration
+interaction (CI) eigensolver within the complete active space self-consistent
+field (CASSCF) procedure, and hence to stochastically treat active spaces far
+larger than conventional CI solvers whilst variationally relaxing orbitals for
+specific spin-pure states. We apply the method to investigate the spin-ladder
+in iron-sulfur dimer and tetramer model systems. We demonstrate the importance
+of the orbital relaxation by comparing the Heisenberg model magnetic coupling
+parameters from the CASSCF procedure to those from a CI-only procedure based on
+restricted open-shell Hartree-Fock orbitals. We show that orbital relaxation
+differentially stabilizes the lower spin states, thus enlarging the coupling
+parameters with respect to the values predicted by ignoring orbital relaxation
+effects. Moreover, we find that while CI eigenvalues are well fit by a simple
+bilinear Heisenberg Hamiltonian, the CASSCF eigenvalues exhibits deviations
+that necessitate the inclusion of biquadratic terms in the model Hamiltonian.",2106.07775v1
+2019-02-20,Synthetic spin orbit interaction for Majorana devices,"The interplay of superconductivity with a non-trivial spin texture holds
+promises for the engineering of non-abelian Majorana quasi-particles. A wide
+class of systems expected to exhibit exotic correlations are based on nanoscale
+conductors with strong spin-orbit interaction, subject to a strong external
+magnetic field. The strength of the spin-orbit coupling is a crucial parameter
+for the topological protection of Majorana modes as it forbids other trivial
+excitations at low energy. The spin-orbit interaction is in principle intrinsic
+to a material. As a consequence, experimental efforts have been recently
+focused on semiconducting nano-conductors or spin-active atomic chains
+contacted to a superconductor. Alternatively, we show how both a spin-orbit and
+a Zeeman effect can be autonomously induced by using a magnetic texture coupled
+to any low dimensional conductor, here a carbon nanotube. Transport
+spectroscopy through superconducting contacts reveals oscillations of Andreev
+like states under a change of the magnetic texture. These oscillations are well
+accounted for by a scattering theory and are absent in a control device with no
+magnetic texture. A large synthetic spin-orbit energy of about 1.1 meV, larger
+than the intrinsic spin orbit energy in many other platforms, is directly
+derived from the number of oscillations. Furthermore, a robust zero energy
+state, the hallmark of devices hosting localized Majorana modes, emerges at
+zero magnetic field. Our findings synthetize all the features for the emergence
+of Majorana modes at zero magnetic field in a controlled, local and autonomous
+fashion. It could be used for advanced experiments, including microwave
+spectroscopy and braiding operations, which are at the heart of new schemes of
+topological quantum computation.",1902.07479v1
+2018-01-25,Synthetic spin-orbit coupling and topological polaritons in Janeys-Cummings lattices,"The interaction between a photon and a qubit in the Janeys-Cummings (JC)
+model generates a kind of quasiparticle called polariton. While they are widely
+used in quantum optics, difficulties in engineering controllable coupling of
+them severely limit their applications to simulate spinful quantum systems.
+Here we show that, in the superconducting quantum circuit context, polariton
+states in the single-excitation manifold of a JC lattice can be used to
+simulate a spin-1/2 system, based on which tunable synthetic spin-orbit
+coupling and novel topological polaritons can be generated and explored. The
+lattice is formed by a sequence of coupled transmission line resonators, each
+of which is connected to a transmon qubit. Synthetic spin-orbit coupling and
+effective Zeeman field of the polariton can both be tuned by modulating the
+coupling strength between neighbouring resonators, allowing for the realization
+of a large variety of polaritonic topological semimetal bands. Methods for
+detecting the polaritonic topological edge states and topological invariants
+are also proposed. Therefore, our work suggests that the JC lattice is a
+versatile platform for exploring spinful topological states of matter, which
+may inspire developments of topologically protected quantum optical and
+information processing devices.",1801.08426v4
+2015-07-03,Persistent Skyrmion Lattice of Noninteracting Electrons with Spin-Orbit Coupling,"A persistent spin helix (PSH) is a robust helical spin-density pattern
+arising in disordered 2D electron gases with Rashba $\alpha$ and Dresselhaus
+$\beta$ spin-orbit (SO) tuned couplings, i.e., $\alpha=\pm\beta$. Here we
+investigate the emergence of a Persistent Skyrmion Lattice (PSL) resulting from
+the coherent superposition of PSHs along orthogonal directions -- crossed PSHs
+-- in wells with two occupied subbands $\nu=1,2$. For realistic GaAs wells we
+show that the Rashba $\alpha_\nu$ and Dresselhaus $\beta_\nu$ couplings can be
+simultaneously tuned to equal strengths but opposite signs, e.g., $\alpha_1=
+\beta_1$ and $\alpha_2=-\beta_2$. In this regime and away from band
+anticrossings, our {\it non-interacting} electron gas sustains a topologically
+non-trivial skyrmion-lattice spin-density excitation, which inherits the
+robustness against spin-independent disorder and interactions from its
+underlying crossed PSHs. We find that the spin relaxation rate due to the
+interband SO coupling is comparable to that of the cubic Dresselhaus term as a
+mechanism of the PSL decay. Near anticrossings, the interband-induced spin
+mixing leads to unusual spin textures along the energy contours beyond those of
+the Rahsba-Dresselhaus bands. Our PSL opens up the unique possibility of
+observing topological phenomena, e.g., topological and skyrmion Hall effects,
+in ordinary GaAs wells with non-interacting electrons.",1507.00811v2
+2020-12-22,Orbital Rotations induced by Charges of Polarons and Defects in Doped Vanadates,"We explore the competiton of doped holes and defects that leads to the loss
+of orbital order in vanadate perovskites. In compounds such as La$_{1-{\sf
+x}}$Ca$_{\,\sf x}$VO$_3$ spin and orbital order result from super-exchange
+interactions described by an extended three-orbital degenerate Hubbard-Hund
+model for the vanadium $t_{2g}$ electrons. Long-range Coulomb potentials of
+charged Ca$^{2+}$ defects and $e$-$e$ interactions control the emergence of
+defect states inside the Mott gap. The quadrupolar components of the Coulomb
+fields of doped holes induce anisotropic orbital rotations of degenerate
+orbitals. These rotations modify the spin-orbital polaron clouds and compete
+with orbital rotations induced by defects. Both mechanisms lead to a mixing of
+orbitals, and cause the suppression of the asymmetry of kinetic energy in the
+$C$-type magnetic phase. We find that the gradual decline of orbital order with
+doping, a characteristic feature of the vanadates, however, has its origin not
+predominantly in the charge carriers, but in the off-diagonal couplings of
+orbital rotations induced by the charges of the doped ions.",2012.11919v1
+2015-07-01,Dynamical spin-density waves in a spin-orbit-coupled Bose-Einstein condensate,"Synthetic spin-orbit (SO) coupling, an important ingredient for quantum
+simulation of many exotic condensed matter physics, has recently attracted
+considerable attention. The static and dynamic properties of a SO coupled
+Bose-Einstein condensate (BEC) have been extensively studied in both theory and
+experiment. Here we numerically investigate the generation and propagation of a
+\textit{dynamical} spin-density wave (SDW) in a SO coupled BEC using a fast
+moving Gaussian-shaped barrier. We find that the SDW wavelength is sensitive to
+the barrier's velocity while varies slightly with the barrier's peak potential
+or width. We qualitatively explain the generation of SDW by considering a
+rectangular barrier in a one dimensional system. Our results may motivate
+future experimental and theoretical investigations of rich dynamics in the SO
+coupled BEC induced by a moving barrier.",1507.00318v1
+2017-10-05,Magnetic Skyrmionic Polarons,"We study a two-dimensional electron gas exchanged-coupled to a system of
+classical magnetic ions. For large Rashba spin-orbit coupling a single electron
+can become self-trapped in a skyrmion spin texture self-induced in the magnetic
+ions system. This new quasiparticle carries electrical and topological charge
+as well as a large spin, and we named it as magnetic skyrmionic polaron. We
+study the range of parameters; temperature, exchange coupling, Rashba coupling
+and magnetic field, for which the magnetic skyrmionic polaron is the
+fundamental state in the system. The dynamics of this quasiparticle is studied
+using the collective coordinate approximation, and we obtain that in presence
+of an electric field the new quasiparticle shows, because the chirality of the
+skyrmion, a Hall effect. Finally we argue that the magnetic skyrmionic polarons
+can be found in large Rashba spin-orbit coupling semiconductors as GeMnTe.",1710.02182v1
+2021-12-16,Semiconductor Spin Qubits,"The spin degree of freedom of an electron or a nucleus is one of the most
+basic properties of nature and functions as an excellent qubit, as it provides
+a natural two-level system that is insensitive to electric fields, leading to
+long quantum coherence times. We review the physics of semiconductor spin
+qubits, focusing not only on the early achievements of spin initialization,
+control, and readout in GaAs quantum dots, but also on recent advances in Si
+and Ge spin qubits, including improved charge control and readout, coupling to
+other quantum degrees of freedom, and scaling to larger system sizes. We begin
+by introducing the four major types of spin qubits: single spin qubits, donor
+spin qubits, singlet-triplet spin qubits, and exchange-only spin qubits. We
+then review the mesoscopic physics of quantum dots, including single-electron
+charging, valleys, and spin-orbit coupling. We next give a comprehensive
+overview of the physics of exchange interactions, a crucial resource for
+single- and two-qubit control in spin qubits. The bulk of this review is
+centered on the presentation of results from each major spin qubit type, the
+present limits of fidelity, and a brief overview of alternative spin qubit
+platforms. We then give a physical description of the impact of noise on
+semiconductor spin qubits, aided in large part by an introduction to the filter
+function formalism. Lastly, we review recent efforts to hybridize spin qubits
+with superconducting systems, including charge-photon coupling, spin-photon
+coupling, and long-range cavity-mediated spin-spin interactions. Cavity-based
+readout approaches are also discussed. This review is intended to give an
+appreciation for the future prospects of semiconductor spin qubits, while
+highlighting the key advances in mesoscopic physics over the past two decades
+that underlie the operation of modern quantum-dot and donor spin qubits.",2112.08863v1
+2016-08-26,Non-collinear antiferromagnetism of coupled spins and pseudospins in the double perovskite La2CuIrO6,"We report the structural, magnetic and thermodynamic properties of the double
+perovskite compound La2CuIrO6 from X-ray, neutron diffraction, neutron
+depolarization, dc magnetization, ac susceptibility, specific heat,
+muon-spin-relaxation (uSR), electron-spin-resonance (ESR) and nuclear magnetic
+resonance (NMR) measurements. Below ~113 K, short-range spin-spin correlations
+occur within the Cu2+ sublattice. With decreasing temperature, the Ir4+
+sublattice progressively involves in the correlation process. Below T = 74 K,
+the magnetic sublattices of Cu (spin s = 1/2) and Ir (pseudospin j = 1/2) in
+La2CuIrO6 are strongly coupled and exhibit an antiferromagnetic phase
+transition into a non-collinear magnetic structure accompanied by a small
+uncompensated transverse moment. A weak anomaly in ac-susceptibility as well as
+in the NMR and {\mu}SR spin lattice relaxation rates at 54 K is interpreted as
+a cooperative ordering of the transverse moments which is influenced by the
+strong spin-orbit coupled 5d ion Ir4+. We argue that the rich magnetic
+behaviour observed in La2CuIrO6 is related to complex magnetic interactions
+between the strongly correlated spin-only 3d ions with the strongly spin-orbit
+coupled 5d transition ions where a combination of the spin-orbit coupling and
+the low-symmetry of the crystal lattice plays a special role for the spin
+structure in the magnetically ordered state.",1608.07513v2
+2014-10-09,Leading order finite size effects with spins for inspiralling compact binaries,"The leading order finite size effects due to spin, namely that of the cubic
+and quartic in spin interactions, are derived for the first time for generic
+compact binaries via the effective field theory for gravitating spinning
+objects. These corrections enter at the third and a half and fourth
+post-Newtonian orders, respectively, for rapidly rotating compact objects.
+Hence, we complete the leading order finite size effects with spin up to the
+fourth post-Newtonian accuracy. We arrive at this by augmenting the point
+particle effective action with new higher dimensional nonminimal coupling
+worldline operators, involving higher-order derivatives of the gravitational
+field, and introducing new Wilson coefficients, corresponding to constants,
+which describe the octupole and hexadecapole deformations of the object due to
+spin. These Wilson coefficients are fixed to unity in the black hole case. The
+nonminimal coupling worldline operators enter the action with the electric and
+magnetic components of the Weyl tensor of even and odd parity, coupled to even
+and odd worldline spin tensors, respectively. Moreover, the non relativistic
+gravitational field decomposition, which we employ, demonstrates a coupling
+hierarchy of the gravito-magnetic vector and the Newtonian scalar, to the odd
+and even in spin operators, respectively, which extends that of minimal
+coupling. This observation is useful for the construction of the Feynman
+diagrams, and provides an instructive analogy between the leading order
+spin-orbit and cubic in spin interactions, and between the leading order
+quadratic and quartic in spin interactions.",1410.2601v3
+2007-10-23,Silicon in the Quantum Limit: Quantum Computing and Decoherence in Silicon Architectures,"Semiconductor architectures hold promise for quantum information processing
+(QIP) applications due to their large industrial base and perceived scalability
+potential. Electron spins in silicon in particular may be an excellent
+architecture for QIP and also for spin electronics (spintronics) applications.
+While the charge of an electron is easily manipulated by charged gates, the
+spin degree of freedom is well isolated from charge fluctuations. Inherently
+small spin-orbit coupling and the existence of a spin-zero Si isotope
+facilitate long single spin qubit coherence times. Here we consider the
+relaxation properties of localized electronic states in silicon due to donors,
+quantum wells, and quantum dots, including effects due to phonons and Rashba
+spin-orbit coupling. Our analysis is impeded by the complicated, many-valley
+band structure of silicon and previously unaddressed physics in silicon quantum
+wells. We find that electron spins in silicon and especially strained silicon
+have excellent decoherence properties. Where possible we compare with
+experiment to test our theories. We go beyond issues of coherence in a quantum
+computer to problems of control and measurement. Precisely what makes spin
+relaxation so long in semiconductor architectures makes spin measurement so
+difficult. To address this, we propose a new scheme for spin readout which has
+the added benefit of automatic spin initialization, a vital component of
+quantum computing and quantum error correction. Our results represent important
+practical milestones on the way to the design and construction of a
+silicon-based quantum computer.",0710.4263v1
+2008-05-21,Kinetics of spin coherence of electrons in $n$-type InAs quantum wells under intense terahertz laser fields,"Spin kinetics in $n$-type InAs quantum wells under intense terahertz laser
+fields is investigated by developing fully microscopic kinetic spin Bloch
+equations via the Floquet-Markov theory and the nonequilibrium Green's function
+approach, with all the relevant scattering, such as the electron-impurity,
+electron-phonon, and electron-electron Coulomb scattering explicitly included.
+We find that a {\em finite} steady-state terahertz spin polarization induced by
+the terahertz laser field, first predicted by Cheng and Wu [Appl. Phys. Lett.
+{\bf 86}, 032107 (2005)] in the absence of dissipation, exists even in the
+presence of all the scattering. We further discuss the effects of the terahertz
+laser fields on the spin relaxation and the steady-state spin polarization. It
+is found that the terahertz laser fields can {\em strongly} affect the spin
+relaxation via hot-electron effect and the terahertz-field-induced effective
+magnetic field in the presence of spin-orbit coupling. The two effects compete
+with each other, giving rise to {\em non-monotonic} dependence of the spin
+relaxation time as well as the amplitude of the steady state spin polarization
+on the terahertz field strength and frequency. The terahertz field dependences
+of these quantities are investigated for various impurity densities, lattice
+temperatures, and strengths of the spin-orbit coupling. Finally, the importance
+of the electron-electron Coulomb scattering on spin kinetics is also addressed.",0805.3280v3
+2022-05-01,"Computational Insights into Electronic Excitations, Spin-Orbit Coupling Effects, and Spin Decoherence in Cr(IV)-based Molecular Qubits","The great success of point defects and dopants in semiconductors for quantum
+information processing has invigorated a search for molecules with analogous
+properties. Flexibility and tunability of desired properties in a large
+chemical space have great advantages over solid-state systems. The properties
+analogous to point defects were demonstrated in Cr(IV)-based molecular family,
+Cr(IV)(aryl)$_4$, where the electronic spin states were optically initialized,
+read out, and controlled. Despite this kick-start, there is still a large room
+for enhancing properties crucial for molecular qubits. Here we provide
+computational insights into key properties of the Cr(IV)-based molecules aimed
+at assisting chemical design of efficient molecular qubits. Using the
+multireference ab-initio methods, we investigate the electronic states of
+Cr(IV)(aryl)$_4$ molecules with slightly different ligands, showing that the
+zero-phonon line energies agree with the experiment, and that the excited
+spin-triplet and spin-singlet states are highly sensitive to small chemical
+perturbations. By adding spin-orbit interaction, we find that the sign of the
+uniaxial zero-field splitting (ZFS) parameter is negative for all considered
+molecules, and discuss optically-induced spin initialization via non-radiative
+intersystem crossing. We quantify (super)hyperfine coupling to the $^{53}$Cr
+nuclear spin and to the $^{13}$C and $^1$H nuclear spins, and we discuss
+electron spin decoherence. We show that the splitting or broadening of the
+electronic spin sub-levels due to superhyperfine interaction with $^1$H nuclear
+spins decreases by an order of magnitude when the molecules have a substantial
+transverse ZFS parameter.",2205.00375v2
+2023-03-22,Giant spin Hall effect in AB-stacked MoTe2/WSe2 bilayers,"The spin Hall effect (SHE), in which electrical current generates transverse
+spin current, plays an important role in spintronics for the generation and
+manipulation of spin-polarized electrons. The phenomenon originates from
+spin-orbit coupling. In general, stronger spin-orbit coupling favors larger
+SHEs but shorter spin relaxation times and diffusion lengths. To achieve both
+large SHEs and long-range spin transport in a single material has remained a
+challenge. Here we demonstrate a giant intrinsic SHE in AB-stacked MoTe2/WSe2
+moir\'e bilayers by direct magneto optical imaging. Under moderate electrical
+currents with density < 1 A/m, we observe spin accumulation on transverse
+sample edges that nearly saturates the spin density. We also demonstrate
+long-range spin Hall transport and efficient non-local spin accumulation
+limited only by the device size (about 10 um). The gate dependence shows that
+the giant SHE occurs only near the Chern insulating state, and at low
+temperatures, it emerges after the quantum anomalous Hall breakdown. Our
+results demonstrate moir\'e engineering of Berry curvature and large SHEs for
+potential spintronics applications.",2303.12881v1
+2005-11-24,"Microscopic Model for High-spin vs. Low-spin ground state in $[Ni_2{M(CN)_8]}$ ($M=Mo^V, W^V, Nb^{IV}$) magnetic clusters","Conventional superexchange rules predict ferromagnetic exchange interaction
+between Ni(II) and M (M=Mo(V), W(V), Nb(IV)). Recent experiments show that in
+some systems this superexchange is antiferromagnetic. To understand this
+feature, in this paper we develop a microscopic model for Ni(II)-M systems and
+solve it exactly using a valence bond approach. We identify the direct exchange
+coupling, the splitting of the magnetic orbitals and the inter-orbital electron
+repulsions, on the M site as the parameters which control the ground state spin
+of various clusters of the Ni(II)-M system. We present quantum phase diagrams
+which delineate the high-spin and low-spin ground states in the parameter
+space. We fit the spin gap to a spin Hamiltonian and extract the effective
+exchange constant within the experimentally observed range, for reasonable
+parameter values. We also find a region in the parameter space where an
+intermediate spin state is the ground state. These results indicate that the
+spin spectrum of the microscopic model cannot be reproduced by a simple
+Heisenberg exchange Hamiltonian.",0511594v1
+2005-12-19,Equilibrium spin current through the tunnelling junctions,"We study equilibrium pure spin current through tunnelling junctions at zero
+bias. The two leads of the junctions connected via a thin insulator barrier,
+can be either a ferromagnetic metal (FM) or a nonmagnetic high-mobility
+two-dimensional electron gas (2DEG) with Rashba spin orbital interaction (RSOI)
+or Dresselhaus spin orbital interaction (DSOI). As a lead of a tunnelling
+junction, the isotropic RSOI or DSOI in 2DEG can give rise to an average
+effective planar magnetic field orthogonal or parallel to the current
+direction. It is found by the linear response theory that equilibrium spin
+current $\vec{J}$ can flow in the following three junctions, 2DEG/2DEG,
+2DEG/FM, and FM/FM junctions, as a result of the exchange coupling between the
+magnetic moments, $\vec{h}_{l}$ and $\vec{h}_{r}$, in the two electrodes of the
+junction, i.e., $\vec{J}\sim\vec{h}_{l}\times\vec{h}_{r}$. An important
+distinction between the FM and 2DEG with RSOI (DSOI) lead is that in a strict
+one-dimensional case RSOI (DSOI) cannot lead to equilibrium spin current in the
+junction since the two spin bands are not spin-polarized as in a FM lead where
+Zeeman spin splitting occurs.",0512430v1
+2008-01-13,Phonon modulation of the spin-orbit interaction as a spin relaxation mechanism in InSb quantum dots,"We calculate the spin relaxation rates in a parabolic InSb quantum dots due
+to the spin interaction with acoustical phonons. We considered the deformation
+potential mechanism as the dominant electron-phonon coupling in the
+Pavlov-Firsov spin-phonon Hamiltonian. By studying suitable choices of magnetic
+field and lateral dot size, we determine regions where the spin relaxation
+rates can be practically suppressed. We analyze the behavior of the spin
+relaxation rates as a function of an external magnetic field and mean quantum
+dot radius. Effects of the spin admixture due to Dresselhaus contribution to
+spin-orbit interaction are also discussed.",0801.1952v1
+2008-03-25,Quantum dissipative Rashba spin ratchets,"We predict the possibility to generate a finite stationary spin current by
+applying an unbiased ac driving to a quasi-one-dimensional asymmetric periodic
+structure with Rashba spin-orbit interaction and strong dissipation. We show
+that under a finite coupling strength between the orbital degrees of freedom
+the electron dynamics at low temperatures exhibits a pure spin ratchet
+behavior, {\it i.e.} a finite spin current and the absence of charge transport
+in spatially asymmetric structures. It is also found that the equilibrium spin
+currents are not destroyed by the presence of strong dissipation.",0803.3526v2
+2009-06-07,Do Spinors Frame-Drag?,"We investigate the effect of the intrinsic spin of a fundamental spinor field
+on the surrounding spacetime geometry. We show that despite the lack of a
+rotating stress-energy source (and despite claims to the contrary) the
+intrinsic spin of a spin-half fermion gives rise to a frame-dragging effect
+analogous to that of orbital angular momentum, even in Einstein-Hilbert gravity
+where torsion is constrained to be zero. This resolves a paradox regarding the
+counter-force needed to restore Newton's third law in the well known spin-orbit
+interaction. In addition, the frame-dragging effect gives rise to a {\it
+long-range} gravitationally mediated spin-spin dipole interaction coupling the
+{\it internal} spins of two sources. We argue that despite the weakness of the
+interaction, the spin-spin interaction will dominate over the ordinary inverse
+square Newtonian interaction in any process of sufficiently high-energy for
+quantum field theoretical effects to be non-negligible.",0906.1385v2
+2010-08-17,Spin projection and spin current density within relativistic electronic transport calculations,"A spin projection scheme is presented which allows the decomposition of the
+electric conductivity into two different spin channels within fully
+relativistic $ab$ $initio$ transport calculations that account for the impact
+of spin-orbit coupling. This is demonstrated by calculations of the
+spin-resolved conductivity of Fe$_{1-x}$Cr$_x$ and Co$_{1-x}$Pt$_x$ disordered
+alloys on the basis of the corresponding Kubo-Greenwood equation implemented
+using the Korringa-Kohn-Rostoker coherent potential approximation (KKR-CPA)
+band structure method. In addition, results for the residual resistivity of
+diluted Ni-based alloys are presented that are compared to theoretical and
+experimental ones that rely on Mott's two-current model for spin-polarized
+systems. The application of the scheme to deal with the spin-orbit induced spin
+Hall effect is discussed in addition.",1008.2900v1
+2012-09-11,Enhancement of spin relaxation time in hydrogenated graphene spin valve devices,"Hydrogen adsorbates in graphene are interesting as they are not only strong
+Coulomb scatterers but they also induce a change in orbital hybridization of
+the carbon network from sp^2 into sp^3. This change increases the spin-orbit
+coupling and is expected to largely modify spin relaxation. In this work we
+report the change in spin transport properties of graphene due to plasma
+hydrogenation. We observe an up to three-fold increase of spin relaxation time
+tau_S after moderate hydrogen exposure. This increase of tau_S is accompanied
+by the decrease of charge and spin diffusion coefficients, resulting in a minor
+change in spin relaxation length lambda_S. At high carrier density we obtain
+lambda_S of 7 microns, which allows for spin detection over a distance of 11
+microns. After hydrogenation a value of tau_S as high as 2.7 ns is measured at
+room temperature.",1209.2365v1
+2014-01-15,Extrinsic spin Hall effects measured with lateral spin valve structures,"The spin Hall effect (SHE), induced by spin-orbit interaction in nonmagnetic
+materials, is one of the promising phenomena for conversion between charge and
+spin currents in spintronic devices. The spin Hall (SH) angle is the
+characteristic parameter of this conversion. We have performed experiments of
+the conversion from spin into charge currents by the SHE in lateral spin valve
+structures. We present experimental results on the extrinsic SHEs induced by
+doping nonmagnetic metals, Cu or Ag, with impurities having a large spin-orbit
+coupling, Bi or Pb, as well as results on the intrinsic SHE of Au. The SH angle
+induced by Bi in Cu or Ag is negative and particularly large for Bi in Cu, 10
+times larger than the intrinsic SH angle in Au. We also observed a large SH
+angle for CuPb but the SHE signal disappeared in a few days. Such an aging
+effect could be related to a fast mobility of Pb in Cu and has not been
+observed in CuBi alloys.",1401.3445v2
+2014-07-20,Spintronic magnetic anisotropy,"An attractive feature of magnetic adatoms and molecules for nanoscale
+applications is their superparamagnetism, the preferred alignment of their spin
+along an easy axis preventing undesired spin reversal. The underlying magnetic
+anisotropy barrier --a quadrupolar energy splitting-- is internally generated
+by spin-orbit interaction and can nowadays be probed by electronic transport.
+Here we predict that in a much broader class of quantum-dot systems with spin
+larger than one-half, superparamagnetism may arise without spin-orbit
+interaction: by attaching ferromagnets a spintronic exchange field of
+quadrupolar nature is generated locally. It can be observed in conductance
+measurements and surprisingly leads to enhanced spin filtering even in a state
+with zero average spin. Analogously to the spintronic dipolar exchange field,
+responsible for a local spin torque, the effect is susceptible to electric
+control and increases with tunnel coupling as well as with spin polarization.",1407.5273v1
+2014-09-17,Arbitrary Spin Galilean Oscillator,"The so-called Dirac oscillator was proposed as a modification of the free
+Dirac equation which reproduces many of the properties of the simple harmonic
+oscillator but accompanied by a strong spin-orbit coupling term. It has yet to
+be extended successfully to the arbitrary spin S case primarily because of the
+unwieldiness of general spin Lorentz invariant wave equations. It is shown here
+using the formalism of totally symmetric multispinors that the Dirac oscillator
+can, however, be made to accommodate spin by incorporating it into the
+framework of Galilean relativity. This is done explicitly for spin zero and
+spin one as special cases of the arbitrary spin result. For the general case it
+is shown that the coefficient of the spin-orbit term has a 1/S behavior by
+techniques which are virtually identical to those employed in the derivation of
+the g-factor carried out over four decades ago.",1409.5101v1
+2019-06-26,Fermi Level Dependent Spin Pumping from a Magnetic Insulator into a Topological Insulator,"Topological spintronics aims to exploit the spin-momentum locking in the
+helical surface states of topological insulators for spin-orbit torque devices.
+We address a fundamental question that still remains unresolved in this
+context: does the topological surface state alone produce the largest values of
+spin-charge conversion efficiency or can the strongly spin-orbit coupled bulk
+states also contribute significantly? By studying the Fermi level dependence of
+spin pumping in topological insulator/ferrimagnetic insulator bilayers, we show
+that the spin Hall conductivity is constant when the Fermi level is tuned
+across the bulk band gap, consistent with a full bulk band calculation. The
+results suggest a new perspective, wherein ""bulk-surface correspondence"" allows
+spin-charge conversion to be simultaneously viewed either as coming from the
+full bulk band, or from spin-momentum locking of the surface state.",1906.11116v1
+2018-03-04,Systematic derivation of realistic spin-models for beyond-Heisenberg solids,"We present a systematic derivation of effective lattice spin Hamiltonians
+derived from a rotationally invariant multi-orbital Hubbard model including a
+term ensuring Hund's rule coupling. The Hamiltonians are derived down-folding
+the fermionic degrees of freedom of the Hubbard model into the proper
+low-energy spin sector using L\""owdin partitioning, which will be outlined in
+detail for the case of two sites and two orbitals at each site. Correcting the
+ground state systematically up to fourth order in the hopping of electrons, we
+find for spin $S\geq 1$ a biquadratic, three-spin and four-spin interaction
+beyond the conventional Heisenberg term. Comparing the puzzling energy spectrum
+of the magnetic states for a single Fe monolayer on Ru(0001), obtained from
+density functional theory, with the spin Hamiltonians taken at the limit of
+classical spins, we show that the previously ignored three-spin interaction can
+be comparable in size to the conventional Heisenberg exchange.",1803.01315v3
+2021-03-09,Self-induced spin-orbit torques in metallic ferromagnets,"We present a phenomenological theory of spin-orbit torques in a metallic
+ferromagnet with spin-relaxing boundaries. The model is rooted in the coupled
+diffusion of charge and spin in the bulk of the ferromagnet, where we account
+for the anomalous Hall effects as well as the anisotropic magnetoresistance in
+the corresponding constitutive relations for both charge and spin sectors. The
+diffusion equations are supplemented with suitable boundary conditions
+reflecting the spin-sink capacity of the environment. In inversion-asymmetric
+heterostructures, the uncompensated spin accumulation exerts a dissipative
+torque on the order parameter, giving rise to a current-dependent linewidth in
+the ferromagnetic resonance with a characteristic angular dependence. We
+compare our model to recent spin-torque ferromagnetic resonance measurements,
+illustrating how rich self-induced spin-torque phenomenology can arise even in
+simple magnetic structures.",2103.05743v2
+2023-06-15,Characteristic THz-emissions induced by optically excited collective orbital modes,"We study the generation of collective orbital modes, their evolution, and the
+characteristic non-linear optical response induced by them in a photoinduced
+orbital-ordered correlated oxide using real-time simulations based on an
+interacting multiband tight-binding (TB) model. The d-d optical transitions
+under femtoseconds light-pulse in a orbital-ordered state excite collective
+orbital modes, also known as ""orbitons"". The consistent inclusion of electronic
+interactions and the coupling between charge, spin, and lattice degrees of
+freedom in the TB-model provide a better understanding of the underlying
+mechanisms of the collective orbital modes. The dynamics of Jahn-Teller
+vibrational modes in the photoinduced state modify the intersite orbital
+interaction, which further amplifies these orbital modes. In the presence of
+weak ferroelectricity, the excitation of collective orbital modes induces a
+strong THz oscillatory photocurrent which is long-lived. This suggests an
+alternative way to experimentally detect quasiparticles describing such
+collective modes through THz-emission studies in the photoinduced state. Our
+study also elucidates that quasiparticle dynamics in improper ferroelectric
+oxides can be exploited to achieve highly interesting and non-trivial
+optoelectronic properties.",2306.09107v1
+2003-06-20,Anisotropic transport in the two-dimensional electron gas in the presence of spin-orbit coupling,"In a two-dimensional electron gas as realized by a semiconductor quantum
+well, the presence of spin-orbit coupling of both the Rashba and Dresselhaus
+type leads to anisotropic dispersion relations and Fermi contours. We study the
+effect of this anisotropy on the electrical conductivity in the presence of
+fixed impurity scatterers. The conductivity also shows in general an anisotropy
+which can be tuned by varying the Rashba coefficient. This effect provides a
+method of detecting and investigating spin-orbit coupling by measuring
+spin-unpolarized electrical currents in the diffusive regime. Our approach is
+based on an exact solution of the two-dimensional Boltzmann equation and
+provides also a natural framework for investigating other transport effects
+including the anomalous Hall effect.",0306528v2
+2004-11-06,Spin-Orbit Coupling and Symmetry of the Order Parameter in Strontium Ruthenate,"Determination of the orbital symmetry of a state in spin triplet
+Sr$_2$RuO$_4$ superconductor is a challenge of considerable importance. Most of
+the experiments show that the chiral state of the $\hat{z} (k_x \pm ik_y)$ type
+is realized and remains stable on lowering the temperature. Here we have
+studied the stability of various superconducting states of Sr$_2$RuO$_4$ in the
+presence of spin-orbit coupling.
+  Numerically we found that the chiral state is never the minimum energy. Alone
+among the five states studied it has $<{\bf \hat L}.{\bf \hat S} >=0$ and is
+therefore not affected to linear order in the coupling parameter $\lambda$. We
+found that stability of the chiral state requires spin dependent pairing
+interactions. This imposes strong constraint on the pairing mechanism.",0411169v1
+2005-07-22,Multiple Scattering Theory for Two-dimensional Electron Gases in the Presence of Spin-Orbit Coupling,"In order to model the phase-coherent scattering of electrons in
+two-dimensional electron gases in the presence of Rashba spin-orbit coupling, a
+general partial-wave expansion is developed for scattering from a cylindrically
+symmetric potential. The theory is applied to possible electron flow imaging
+experiments using a moveable scanning probe microscope tip. In such
+experiments, it is demonstrated theoretically that the Rashba spin-orbit
+coupling can give rise to spin interference effects, even for unpolarized
+electrons at nonzero temperature and no magnetic field.",0507528v2
+2005-09-14,Interface Spin-Orbit Coupling in a Non-centrosymmetric Thin-Film Superconductor,"We present a detailed study of the effects of interface spin-orbit coupling
+(ISOC) on the critical field behavior of non-centrosymmetric (NCS), ultra-thin
+superconducting Be/Au bilayers. Parallel field measurements were made in
+bilayers with Be thicknesses in the range of 2 - 10 nm and Au coverages of 0.5
+nm. Though the Au had no significant effect on the superconducting gap, it
+produced profound changes in the spin states of the system. In particular, the
+parallel critical field exceeded the Clogston limit by an order of magnitude in
+the thinnest films studied. In addition, the parallel critical field
+unexpectedly scaled as Hc||/\Delta ~ 1/d suggesting that the spin-orbit
+coupling energy was proportional to Delta/d^2. Tilted field measurements showed
+that contrary to recent theory, the ISOC induces a large in-plane
+superconducting susceptibility but only a very small transverse susceptibility.",0509385v2
+2006-10-18,Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling,"We estimate the triplet-singlet relaxation rate due to spin-orbit coupling
+assisted by phonon emission in weakly-confined quantum dots. Our results for
+two and four electrons show that the different triplet-singlet relaxation
+trends observed in recent experiments under magnetic fields can be understood
+within a unified theoretical description, as the result of the competition
+between spin-orbit coupling and phonon emission efficiency. Moreover, we show
+that both effects are greatly affected by the strength of the confinement and
+the external magnetic field, which may give access to very long-lived triplet
+states as well as to selective population of the triplet Zeeman sublevels.",0610509v2
+2007-12-14,Spin-orbit coupled Bose-Einstein condensates,"We consider a many-body system of pseudo-spin-1/2 bosons with spin-orbit
+interactions, which couple the momentum and the internal pseudo-spin degree of
+freedom created by spatially varying laser fields. The corresponding single-
+particle spectrum is generally anisotropic and contains two degenerate minima
+at finite momenta. At low temperatures, the many-body system condenses into
+these minima generating a new type of entangled Bose-Einstein condensate. We
+show that in the presence of weak density-density interactions the many-body
+ground state is characterized by a twofold degeneracy. The corresponding
+many-body wave function describes a condensate of ``left-'' and
+``right-moving'' bosons. By fine-tuning the parameters of the laser field, one
+can obtain a bosonic version of the spin-orbit coupled Rashba model. In this
+symmetric case, the degeneracy of the ground state is very large, which may
+lead to phases with nontrivial topological properties. We argue that the
+predicted new type of Bose-Einstein condensates can be observed experimentally
+via time-of-flight imaging, which will show characteristic multipeak structures
+in momentum distribution.",0712.2256v3
+2008-10-07,Nontrivial interplay between superconductivity and spin-orbit coupling in non-centrosymmetric ferromagnets,"Motivated by the recent discoveries of ferromagnetic and non-centrosymmetric
+superconductors, we present a mean-field theory for a superconductor that
+\textit{both} lacks inversion symmetry and displays ferromagnetism, a scenario
+which is believed to be realized in UIr. We study the interplay between the
+order parameters to clarify how superconductivity is affected by the presence
+of ferromagnetism and spin-orbit coupling. One of our key findings is that the
+spin-orbit coupling seems to enhance both ferromagnetism and superconductivity
+in all spin channels. We discuss our results in the context of the heavy
+fermion superconductor UIr and analyze possible symmetries of the order
+parameter by the group theory method.",0810.1281v1
+2010-06-26,Spin-Orbit Coupled Spinor Bose-Einstein Condensates,"An effective spin-orbit coupling can be generated in cold atom system by
+engineering atom-light interactions. In this letter we study spin-1/2 and
+spin-1 Bose-Einstein condensates with Rashba spin-orbit coupling, and find that
+the condensate wave function will develop non-trivial structures. From
+numerical simulation we have identified two different phases. In one phase the
+ground state is a single plane wave, and often we find the system splits into
+domains and an array of vortices plays the role as domain wall. In this phase,
+time-reversal symmetry is broken. In the other phase the condensate wave
+function is a standing wave and it forms spin stripe. The transition between
+them is driven by interactions between bosons. We also provide an analytical
+understanding of these results and determines the transition point between the
+two phases.",1006.5148v4
+2010-10-25,Plasmon mass and Drude weight in strongly spin-orbit-coupled 2D electron gases,"Spin-orbit-coupled two-dimensional electron gases (2DEGs) are a textbook
+example of helical Fermi liquids, i.e. quantum liquids in which spin (or
+pseudospin) and momentum degrees-of-freedom at the Fermi surface have a
+well-defined correlation. Here we study the long-wavelength plasmon dispersion
+and the Drude weight of archetypical spin-orbit-coupled 2DEGs. We first show
+that these measurable quantities are sensitive to electron-electron
+interactions due to broken Galileian invariance and then discuss in detail why
+the popular random phase approximation is not capable of describing the
+collective dynamics of these systems even at very long wavelengths. This work
+is focussed on presenting approximate microscopic calculations of these
+quantities based on the minimal theoretical scheme that captures the basic
+physics correctly, i.e. the time-dependent Hartree-Fock approximation. We find
+that interactions enhance the ""plasmon mass"" and suppress the Drude weight. Our
+findings can be tested by inelastic light scattering, electron energy loss, and
+far-infrared optical-absorption measurements.",1010.5169v1
+2012-07-16,Higgs-like Excitations of Cold Atom System with Spin-orbit Coupling,"The Higgs-like excitations, which distinguish from the Higgs amplitude mode
+in many-body system, are single-particle excitations in system with non-Abelian
+gauge potential. We investigate the Higgs-like excitations of cold atom system
+in artificial non-Abelian gauge potential. We demonstrate that when a
+non-Abelian gauge potential is reduced to Abelian potential, its Abelian part
+constructs spin-orbit coupling, and its non-Abelian part emerges Higgs-like
+excitations. The Higgs-like excitations induce a mass of the non-Abelian gauge
+field, which offsets the defect of massless of the gauge theories. We show that
+the mass of gauge field can affect the spin Hall currents which are produced by
+the spin-orbit coupling. We also discuss the observation of these phenomena in
+real experiment.",1207.3707v3
+2012-07-26,Spin-orbit-coupling induced domain-wall resistance in diffusive ferromagnets,"We investigate diffusive transport through a number of domain wall (DW)
+profiles of the important magnetic alloy Permalloy taking into account
+simultaneously noncollinearity, alloy disorder, and spin-orbit coupling fully
+quantum mechanically, from first principles. In addition to observing the known
+effects of magnetization mistracking and anisotropic magnetoresistance, we
+discover a not-previously identified contribution to the resistance of a DW
+that comes from spin-orbit-coupling-mediated spin-flip scattering in a textured
+diffusive ferromagnet. This adiabatic DW resistance, which should exist in all
+diffusive DWs, can be observed by varying the DW width in a systematic fashion
+in suitably designed nanowires.",1207.6277v2
+2012-07-31,Effects of Magnetovolume and Spin-orbit Coupling in the Ferromagnetic Cubic Perovskite BaRuO3,"BaRuO3 having five different crystal structures has been synthesized by
+varying the pressure while sintering. Contrary to the other phases being
+nonmagnetic, the cubic perovskite phase synthesized recently shows an itinerant
+ferromagnetic character. We investigated this ferromagnetic BaRuO3 using first
+principles calculations. A few van Hove singularities appear around the Fermi
+energy, causing unusually high magnetovolume effects of $\Delta M/\Delta a$ ~
+4.3 $\mu_B$/\AA as well as a Stoner instability [IN(0) ~ 1.2]. At the optimized
+lattice parameter a, the magnetic moment M is 1.01 $\mu_B$ in the local spin
+density approximation. When spin-orbit coupling is included, the topologies of
+some Fermi surfaces are altered, and the net moment is reduced by 10% to a
+value very close to the experimentally observed value of ~ 0.8 $\mu_B$. Our
+results indicate that this ferromagnetism is induced by the Stoner instability,
+but the combined effects of the p-d hybridization, the magnetovolume, and the
+spin-orbit coupling determine the net moment. In addition, we briefly discuss
+the results of the tight-binding Wannier function technique.",1207.7145v2
+2012-08-09,Route to Observable Fulde-Ferrell-Larkin-Ovchinnikov Phases in 3D Spin-Orbit Coupled Degenerate Fermi Gases,"The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase was first predicted in 2D
+superconductors about 50 years ago, but so far unambiguous experimental
+evidences are still lacked. The recently experimentally realized
+spin-imbalanced Fermi gases may potentially unveil this elusive state, but
+require very stringent experimental conditions. In this Letter, we show that
+FFLO phases may be observed even in a 3D degenerate Fermi gas with spin-orbit
+coupling and in-plane Zeeman field. The FFLO phase is driven by the interplay
+between asymmetry of Fermi surface and superfluid order, instead of the
+interplay between magnetic and superconducting order in solid materials. The
+predicted FFLO phase exists in a giant parameter region, possesses a stable
+long-range superfluid order due to the 3D geometry, and can be observed with
+experimentally already achieved temperature ($T\sim 0.05E_{F}$), thus opens a
+new fascinating avenue for exploring FFLO physics.",1208.2029v2
+2012-08-28,Spin-orbit coupling induced separation and hidden spin textures in spin-1 Bose-Einstein condensates,"We analytically and numerically investigate the ground state of the
+spin-orbit coupled spin-1 Bose-Einstein condensates in an external parabolic
+potential. When the spin-orbit coupling strength $\kappa$ is comparable with
+that of the trapping potential, the density distribution centers of different
+components of the spinor condensate deviate evidently from the trap center in
+the plane wave and stripe phases. When $\kappa\gg1$, the magnitude of this
+deviation decreases as $\kappa$ is getting larger and larger. Correspondingly,
+periphery half-skyrmions textures arise. This deviation can be reflected by the
+non-uniform magnetic moment in the $z$ direction, $\mathcal{F}_z$. With the
+manipulation of the external trap, the local magnitude of $\mathcal{F}_z$ can
+be increased evidently. This kind of increase of $\mathcal{F}_z$ is also
+observed in the square vortex lattice phase of the condensate.",1208.5591v3
+2012-10-01,Pair-density wave states through spin-orbit coupling in multilayer superconductors,"Spin singlet superconductors with quasi-two dimensional multilayer structure
+are studied in high magnetic fields. Specifically we concentrate on bi- and
+tri-layer systems whose layers by symmetry are subject Rashba-type spin-orbit
+coupling. The combination of magnetic field and spin-orbit coupling leads to a
+first order phase transition between different states of layer-dependent
+superconducting order parameters upon rising the magnetic field. In this
+context we distinguish the low-field Bardeen-Cooper-Schrieffer state where all
+layers have order parameters of the same sign and the high-field pair-density
+wave state where the layer-dependent order parameters change the sign at the
+center layer. We also show that progressive paramagnetic limiting effects yield
+additional features in the H-T phase diagram. As possible realizations of such
+unusual superconducting phases we consider artificial superlattices of
+CeCoIn_5, as well as some multilayer high-T_c cuprates.",1210.0315v1
+2012-11-21,Quantum Degenerate Fermi Gas with Spin-orbit Coupling and Crossed Zeeman Fields,"We study quantum degenerate ultra-cold Fermi gases in the presence of
+artificial spin-orbit coupling and crossed Zeeman fields. We emphasize the case
+where parity is violated in the excitation spectrum and compare it with the
+simpler situation where parity is preserved. We investigate in detail
+spectroscopic properties such as the excitation spectrum, the spectral
+function, momentum distribution and density of states for the cases where
+parity is preserved or violated. Similarly, we show that thermodynamic
+properties such as pressure, chemical potential, entropy, specific heat,
+isothermal compressibility and induced spin polarization become anisotropic as
+a function of Zeeman field components, when parity is violated. Lastly, we
+discuss the effects of interactions and present results for the pairing
+temperature as the precursor for the transition to a superfluid state. In
+particular, we find that the pairing temperature is dramatically reduced in the
+weak interaction regime as parity violation gets stronger, and that the
+momentum dependence of the order parameter for superfluidity violates parity
+when crossed Zeeman fields are present for finite spin-orbit coupling.",1211.5133v1
+2013-02-19,Engineering three-dimensional topological insulators in Rashba-type spin-orbit coupled heterostructures,"Topological insulators represent a new class of quantum phase defined by
+invariant symmetries and spin-orbit coupling that guarantees metallic Dirac
+excitations at its surface. The discoveries of these states have sparked the
+hope of realizing nontrivial excitations and novel effects such as a
+magnetoelectric effect and topological Majorana excitations. Here we develop a
+theoretical formalism to show that a three dimensional topological insulator
+can be designed artificially via stacking bilayers of two-dimensional Fermi
+gases with opposite Rashba-type spin-orbit coupling on adjacent layers, and
+with inter-layer quantum tunneling. We demonstrate that in the stack of
+bilayers grown along a (001)-direction, a nontrivial topological phase
+transition occurs above a critical number of Rashba-bilayers. In the
+topological phase we find the formation of a single spin-polarized Dirac cone
+at the $\Gamma$-point. This approach offers an accessible way to design
+artificial topological insulators in a set up that takes full advantage of the
+atomic layer deposition approach. This design principle is tunable and also
+allows us to bypass limitations imposed by bulk crystal geometry.",1302.4514v2
+2013-04-08,Phase diagrams and Thomas-Fermi estimates for spin-orbit coupled Bose-Einstein Condensates under rotation,"We provide complete phase diagrams describing the ground state of a trapped
+spinor BEC under the combined effects of rotation and a Rashba spin-orbit
+coupling. The interplay between the different parameters (magnitude of
+rotation, strength of the spin-orbit coupling and interaction) leads to a rich
+ground state physics that we classify. We explain some features analytically in
+the Thomas-Fermi approximation, writing the problem in terms of the total
+density, total phase and spin. In particular, we analyze the giant skyrmion,
+and find that it is of degree 1 in the strong segregation case. In some regions
+of the phase diagrams, we relate the patterns to a ferromagnetic energy.",1304.2178v2
+2014-02-18,The role of spin-orbit coupling in topologically protected interface states in Dirac materials,"We highlight the fact that two-dimensional materials with Dirac-like low
+energy band structures and spin-orbit coupling will produce linearly dispersing
+topologically protected Jackiw-Rebbi modes at interfaces where the Dirac mass
+changes sign. These modes may support persistent spin or valley currents
+parallel to the interface, and the exact arrangement of such topologically
+protected currents depends crucially on the details of the spin-orbit coupling
+in the material. As examples, we discuss buckled two-dimensional hexagonal
+lattices such as silicene or germanene, and transition metal dichalcogenides
+such as MoS$_2$.",1402.4347v2
+2014-11-13,Exact solitons and manifold mixing dynamics in the spin-orbit-coupled spinor condensates,"We derive exact static as well as moving solitonic solutions to the
+one-dimensional spin-orbit-coupled F=1 Bose-Einstein condensates. The static
+polar soliton is shown to be the ground state by the imaginary-time evolution
+method. It shows a helical modulation of the order parameter due to the
+spin-orbit coupling. In particular, the moving soliton exhibits a periodic
+oscillation among the particle numbers of the hyperfine states. We further
+explore the temporal evolution of the static polar soliton and find that the
+spin-polarization exhibits dynamical oscillations. This disappearance and
+re-emergence of the ferromagnetic state indicates the mixing of the
+ferromagnetic and the antiferromagnetic manifolds.",1411.3420v1
+2015-08-19,Chiral Magnetic Effect and Anomalous Hall Effect in Antiferromagnetic Insulators with Spin-Orbit Coupling,"We search for dynamical magnetoelectric phenomena in three-dimensional
+correlated systems with spin-orbit coupling. We focus on the antiferromagnetic
+insulator phases where the dynamical axion field is realized by the fluctuation
+of the antiferromagnetic order parameter. It is shown that the dynamical chiral
+magnetic effect, an alternating current generation by magnetic fields, emerges
+due to the time dependences of the order parameter such as antiferromagnetic
+resonance. It is also shown that the anomalous Hall effect arises due to the
+spatial variations of the order parameter such as antiferromagnetic domain
+walls. Our study indicates that spin excitations in antiferromagnetic
+insulators with spin-orbit coupling can result in nontrivial charge responses.
+Moreover, observing the chiral magnetic effect and anomalous Hall effect in our
+system is equivalent to detecting the dynamical axion field in condensed
+matter.",1508.04590v2
+2016-03-01,Evidence for correlated states in a cluster of bosons with Rashba spin-orbit coupling,"We study the ground state properties of spin-half bosons subjected to the
+Rashba spin-orbit coupling in two dimensions. Due to the enhancement of the low
+energy density of states, it is expected that the effect of interaction becomes
+more important. After reviewing several possible ideal condensed states, we
+carry out an exact diagonalization calculation for a cluster of the bosons in
+the presence of strong spin-orbit coupling on a two-dimensional disk and reveal
+strong correlations in its ground state. We derive a low-energy effective
+Hamiltonian to understand how states with strong correlations become
+energetically more favorable than the ideal condensed states.",1603.00163v1
+2019-05-24,The microscopic Einstein-de Haas effect,"The Einstein-de Haas (EdH) effect, where the spin angular momentum of
+electrons is transferred to the mechanical angular momentum of atoms, was
+established experimentally in 1915. While a semi-classical explanation of the
+effect exists, modern electronic structure methods have not yet been applied to
+modelling the phenomenon. In this paper we investigate its microscopic origins
+by means of a non-collinear tight-binding model of an $\textrm{O}_2$ dimer,
+which includes the effects of spin-orbit coupling, coupling to an external
+magnetic field, and vector Stoner exchange. By varying an external magnetic
+field in the presence of spin-orbit coupling, a torque can be generated on the
+dimer, validating the presence of the EdH effect. Avoided energy level
+crossings and the rate of change of magnetic field determine the evolution of
+the spin. We find also that the torque exerted on the nuclei by the electrons
+in a time-varying $B$ field is not only due to the EdH effect. Other
+contributions arise from field-induced changes in the electronic orbital
+angular momentum and from the direct action of the Faraday electric field
+associated with the time-varying magnetic field.",1905.10449v1
+2020-07-01,First-principles Dzyaloshinskii-Moriya interaction in a non-collinear framework,"We have derived an expression of the Dzyaloshinskii-Moriya (DM) interaction,
+where all the three components of the DM vector can be calculated
+independently, for a general, non-collinear magnetic configuration. The
+formalism is implemented in a real space - linear muffin-tin orbital - atomic
+sphere approximation (RS-LMTO-ASA) method. We have chosen the Cr triangular
+trimer on Au(111) and Mn triangular trimers on Ag(111) and Au(111) surfaces as
+numerical examples. The results show that the DM interaction (module and
+direction) is drastically different for collinear and non-collinear states.
+Based on the relation between the spin and charge currents flowing in the
+system and their coupling to the non-collinear magnetic configuration of the
+triangular trimer, we demonstrate that the DM interaction can be significant,
+even in the absence of spin-orbit coupling. This is shown to emanate from the
+non-collinear magnetic structure, that can induce significant spin and charge
+currents even with spin-orbit coupling is ignored.",2007.00358v2
+2020-07-23,Laser-induced topological $s$-wave superconductivity in bilayer transition metal dichalcogenides,"In this paper, we propose a way to realize topological $s$-wave
+superconductivity with application of circularly polarized laser light in
+two-dimensional bilayer transition metal dichalcogenides (TMDs). Using Floquet
+theory, we analyze a tight-binding model of bilayer TMDs with time-periodic
+electric fields. After deriving an effective Hamiltonian, we investigate
+topological properties of the $s$-wave superconducting state. The laser light
+induces valley-dependent layer polarization and makes the system to be a
+topologically nontrivial superconducting state characterized by the Chern
+number. We show topological phase diagrams in the absence and presence of the
+Kane-Mele spin-orbit coupling which causes hidden spin polarization in bilayer
+TMDs. Although the topological phase diagram is affected by the spin-orbit
+coupling, topological superconductivity can be realized without relying on the
+spin-orbit coupling in sharp contrast to a previous proposal of laser-induced
+topological superconductivity [K. Takasan, \textit{et al.}, Phys. Rev. B
+\textbf{95}, 134508 (2017)]. We also discuss experimental setups to detect the
+topological phase.",2007.11812v1
+2020-07-28,Dynamic modulation of phonon-assisted transitions in quantum defects in monolayer transition-metal dichalcogenide semiconductors,"Quantum localization via atomic point defects in semiconductors is of
+significant fundamental and technological importance. Quantum defects in
+monolayer transition-metal dichalcogenide semiconductors have been proposed as
+stable and scalable optically-addressable spin qubits. Yet, the impact of
+strong spin-orbit coupling on their dynamical response, for example under
+optical excitation, has remained elusive. In this context, we study the effect
+of spin-orbit coupling on the electron-phonon interaction in a single chalcogen
+vacancy defect in monolayer transition metal dichalcogenides, molybdenum
+disulfide (MoS$_2$) and tungsten disulfide (WS$_2$). From ab initio electronic
+structure theory calculations, we find that spin-orbit interactions tune the
+magnitude of the electron-phonon coupling in both optical and charge-state
+transitions of the defect, modulating their respective efficiencies. This
+observation opens up a promising scheme of dynamically modulating material
+properties to tune the local behavior of a quantum defect.",2007.14399v1
+2014-03-05,Random Rashba spin-orbit coupling at the quantum spin Hall edge,"We study a one-dimensional helical system with random Rashba spin-orbit
+coupling. Using renor- malization group methods, we derive a consistent set of
+flow equations governing the important con- trol parameters of the
+backscattering process. Thereby, we prove the existence of disorder-induced
+two-particle backscattering that can even be non-local in space. This analysis
+allows us to derive the scaling form of the conductance at low temperatures. We
+find that two-particle backscattering due to random spin-orbit coupling differs
+from the one off a single Rashba impurity by both the scaling of the
+conductance with the temperature and the relevance of the backscattering
+operators.",1403.1082v2
+2018-05-07,Revealing Controllable Anisotropic Magnetoresistance in Spin Orbit Coupled Antiferromagnet Sr2IrO4,"Antiferromagnetic spintronics actively introduces new principles of magnetic
+memory, in which the most fundamental spin-dependent phenomena, i.e.
+anisotropic magnetoresistance effects, are governed by an antiferromagnet
+instead of a ferromagnet. A general scenario of the antiferromagnetic
+anisotropic magnetoresistance effects mainly stems from the magnetocrystalline
+anisotropy related to spin-orbit coupling. Here we demonstrate magnetic field
+driven contour rotation of the fourfold anisotropic magnetoresistance in bare
+antiferromagnetic Sr2IrO4/SrTiO3 (001) thin films hosting a strong spin-orbit
+coupling induced Jeff=1/2 Mott state. Concurrently, an intriguing minimal in
+the magnetoresistance emerges. Through first principles calculations, the
+band-gap engineering due to rotation of the Ir isospins is revealed to be
+responsible for these emergent phenomena, different from the traditional
+scenario where relatively more conductive state was obtained usually when
+magnetic field was applied along the magnetic easy axis. Our findings
+demonstrate a new efficient route, i.e. via the novel Jeff=1/2 state, to
+realize controllable anisotropic magnetoresistance in antiferromagnetic
+materials.",1805.02394v1
+2012-04-10,Topological phases in a two-dimensional lattice: Magnetic field versus spin-orbit coupling,"In this work, we explore the rich variety of topological states that arise in
+two-dimensional systems, by considering the competing effects of spin-orbit
+couplings and a perpendicular magnetic field on a honeycomb lattice. Unlike
+earlier approaches, we investigate minimal models in order to clarify the
+effects of the intrinsic and Rashba spin-orbit couplings, and also of the
+Zeeman splitting, on the quantum Hall states generated by the magnetic field.
+In this sense, our work provides an interesting path connecting quantum Hall
+and quantum spin Hall physics. First, we consider the properties of each term
+individually and we analyze their similarities and differences. Secondly, we
+investigate the subtle competitions that arise when these effects are combined.
+We finally explore the various possible experimental realizations of our model.",1204.2212v2
+2015-12-02,Synthesizing Majorana zero-energy modes in a periodically gated quantum wire,"We explore a scheme for engineering a one-dimensional spinless p-wave
+superconductor hosting unpaired Majorana zero-energy modes, using an
+all-electric setup with a spin-orbit coupled quantum wire in proximity to an
+s-wave superconductor. The required crossing of the Fermi level by a single
+spin-split energy band is ensured by employing a periodically modulated Rashba
+interaction, which, assisted by electron-electron interactions and a uniform
+Dresselhaus interaction, opens a gap at two of the spin-orbit shifted Fermi
+points. While an implementation in a hybrid superconductor-semiconductor device
+requires improvements upon present-day capabilities, a variant of our scheme
+where spin-orbit-coupled cold fermions are effectively proximity-coupled to a
+BEC reservoir of Feshbach molecules may provide a ready-to-use platform.",1512.00827v3
+2017-07-10,"Ultracold atoms in a square lattice with spin-orbit coupling: Charge order, superfluidity, and topological signatures","We present an $\textit{ab initio}$, numerically exact study of attractive
+fermions in square lattices with Rashba spin-orbit coupling. The ground state
+of this system is a supersolid, with co-existing charge and superfluid order.
+The superfluid is composed of both singlet and triplet pairs induced by
+spin-orbit coupling. We perform large-scale calculations using auxiliary-field
+quantum Monte Carlo to provide the first full, quantitative description of the
+charge, spin, and pairing properties of the system. In addition to
+characterizing the exotic physics, our results will serve as essential
+high-accuracy benchmarks for the intense theoretical and especially
+experimental efforts in ultracold atoms to realize and understand an expanding
+variety of quantum Hall and topological superconductor systems.",1707.02994v1
+2017-07-19,Odd-parity superconductivity in bilayer transition metal dichalcogenides,"Spin-orbit coupling in transition metal dichalcogenides (TMDCs) causes
+spin-valley locking giving rise to unconventional optical, transport, and
+superconducting properties. In this paper, we propose exotic superconductivity
+in bilayer group-IV TMDCs by symmetry control. The sublattice-dependent hidden
+spin-orbit coupling arising from local inversion symmetry breaking in the
+crystal structure may stabilize the odd-parity superconductivity by purely
+$s$-wave local pairing interaction. The stability of the odd-parity
+superconducting state depends on the bilayer stacking. The 2H$_b$ stacking in
+MoX$_2$ and WX$_2$ (X =S, Se) favors the odd-parity superconductivity due to
+interlayer quantum interference. On the other hand, the odd-parity
+superconductivity is suppressed by the 2H$_a$ stacking of NbSe$_2$. Calculating
+the phase diagram of the tight-binding model derived from first principles band
+calculations, we conclude that the intercalated bilayer MoS$_2$ and WS$_2$ are
+candidates for a new class of odd-parity superconductors by spin-orbit
+coupling.",1707.05964v1
+2020-01-26,Topological properties of a generalized spin-orbit-coupled Su-Schrieffer-Heeger model,"We explore theoretically the effect of inter and intra cell spin-orbit
+couplings on topological properties of a generalized Su-Schrieffer-Heeger model
+with multipartite lattice structure containing even number of sites per unit
+cell. We show that the spin-orbit couplings enrich topological phase diagrams
+so that nontrivial topological regions in the space of parameters extend
+significantly which is suitable for potential applications. We present an
+analytical formula for winding number in terms of sublattice number signaling
+that there are two nontrivial topological phases in the space of parameters
+hosting twofold/fourfold degenerate zero-mode boundary states. We also find
+that by increasing the number of sublattices within unit cell, the nontrivial
+regions of topological phase diagram including twofold degenerate zero-mode
+edge states extend dramatically. Our symmetry investigation shows that U(1)
+spin rotational symmetry around the lattice direction is the crucial ingredient
+for the appearance of fourfold degenerate zero-mode boundary states.",2001.09491v1
+2017-09-02,"Gravitational spin-orbit coupling in binary systems, post-Minkowskian approximation and effective one-body theory","A novel approach for extracting gauge-invariant information about spin-orbit
+coupling in gravitationally interacting binary systems is introduced. This
+approach is based on the ""scattering holonomy"", i.e. the integration (from the
+infinite past to the infinite future) of the differential spin evolution along
+the two worldlines of a binary system in hyperboliclike motion. We apply this
+approach to the computation, at the first post-Minkowskian approximation (i.e.
+first order in $G$ and all orders in $v/c$), of the values of the two
+gyrogravitomagnetic ratios describing spin-orbit coupling in the Effective
+One-Body formalism. These gyrogravitomagnetic ratios are found to tend to zero
+in the ultrarelativistic limit.",1709.00590v1
+2017-11-13,Quantum Hall Effect in Graphene with Interface-Induced Spin-Orbit Coupling,"We consider an effective model for graphene with interface-induced spin-orbit
+coupling and calculate the quantum Hall effect in the low-energy limit. We
+perform a systematic analysis of the contribution of the different terms of the
+effective Hamiltonian to the quantum Hall effect (QHE). By analysing the
+spin-splitting of the quantum Hall states as a function of magnetic field and
+gate-voltage, we obtain different scaling laws that can be used to characterise
+the spin-orbit coupling in experiments. Furthermore, we employ a real-space
+quantum transport approach to calculate the quantum Hall conductivity and
+investigate the robustness of the QHE to disorder introduced by hydrogen
+impurities. For that purpose, we combine first-principles calculations and a
+genetic algorithm strategy to obtain a graphene-only Hamiltonian that models
+the impurity.",1711.04811v2
+2017-11-15,Spin-orbit coupled bosons in one dimension: emergent gauge field and Lifshitz transition,"In the presence of strong spin-independent interactions and spin-orbit
+coupling, we show that the spinor Bose liquid confined to one spatial dimension
+undergoes an interaction- or density-tuned quantum phase transition similar to
+one theoretically proposed for itinerant magnetic solid-state systems. The
+order parameter describes broken $Z_2$ inversion symmetry, with the ordered
+phase accompanied by non-vanishing momentum which is generated by fluctuations
+of an emergent dynamical gauge field at the phase transition. This quantum
+phase transition has dynamical critical exponent $z \simeq 2$, typical of a
+Lifshitz transition, but is described by a nontrivial interacting fixed point.
+From direct numerical simulation of the microscopic model, we extract
+previously unknown critical exponents for this fixed point. Our model describes
+a realistic situation of 1D ultracold atoms with Raman-induced spin-orbit
+coupling, establishing this system as a platform for studying exotic critical
+behavior of the Hertz-Millis type.",1711.05794v2
+2018-03-16,Revealing weak spin-orbit coupling effects on charge carriers in a $π$-conjugated polymer,"We measure electrically detected magnetic resonance (EDMR) on organic
+light-emitting diodes (OLEDs) made of the polymer
+poly[2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene] (MEH-PPV) at room
+temperature and high magnetic fields, where spectral broadening of the
+resonance due to spin-orbit coupling (SOC) exceeds that due to the local
+hyperfine fields. Density-functional-theory calculations on an open-shell model
+of the material reveal g-tensors of charge-carrier spins in the lowest
+unoccupied (electron) and highest occupied (hole) molecular orbitals. These
+tensors are used for simulations of magnetic resonance line-shapes. Besides
+providing the first quantification and direct observation of SOC effects on
+charge-carrier states in these weakly SO-coupled hydrocarbons, this procedure
+demonstrates that spin-related phenomena in these materials are fundamentally
+monomolecular in nature.",1803.06052v1
+2018-03-28,Split Fermi Surfaces of the Spin-Orbit-Coupled Metal Cd2Re2O7 Probed by de Haas-van Alphen Effect,"The superconducting pyrochlore oxide Cd2Re2O7 shows a structural transition
+with inversion symmetry breaking (ISB) at Ts1 = 200 K. A recent theory [L. Fu,
+Phys. Rev. Lett. 115, 026401 (2015)] suggests that the origin is an electronic
+instability that leads to a multipolar order in the spin-orbit-coupled metal.
+To observe the Fermi surface of the low-temperature phase of Cd2Re2O7, we
+perform de Haas-van Alphen effect measurements by means of magnetic torque. In
+reference to a calculated band structure, the spin-split Fermi surfaces with
+large cyclotron masses of 5-9m0 are revealed. The splitting is suggested to be
+due to an antisymmetric spin-orbit coupling induced by ISB, the strength of
+which is estimated to be approximately 67 K, which is rather smaller than those
+of typical non-centrosymmetric metals.",1803.10472v1
+2019-11-08,Ground states of dipolar spin-orbit-coupled Bose-Einstein condensates in a toroidal trap,"We investigate the ground-state structures of dipolar spin-orbit-coupled
+Bose-Einstein condensates in a toroidal trap. Combined effects of dipole-dipole
+interaction (DDI) and spin-orbit coupling (SOC) on the ground states of the
+system are discussed. A ground-state phase diagram is obtained as a function of
+the SOC and DDI strengths. As two new degrees of freedom, the DDI and SOC can
+be used to obtain the desired ground-state phases and to control the phase
+transition between various ground states. In particular, the system displays
+exotic topological structures and spin textures, such as half-quantum vortex,
+vortex string, vortex necklace, complex vortex lattice including giant vortex
+and hidden antivortex chains, different skyrmions, meron
+(half-skyrmion)-antimeron (half-antiskyrmion) necklace, and composite
+meron-antimeron lattice.",1911.03303v1
+2020-09-30,Tunable critical field in Rashba superconductor thin-films,"The upper critical field in type II superconductors is limited by the Pauli
+paramagnetic limit. In superconductors with strong Rashba spin-orbit coupling
+this limit can be overcome by forming a helical state. Here we quantitatively
+study the magnetic field-temperature phase diagram of finite-size
+superconductors with Rashba spin-orbit coupling. We discuss the effect of
+finite size and shape anisotropy. We demonstrate that the critical field is
+controllable by intrinsic parameters such as spin-orbit coupling strength and
+tunable parameters such as sample geometry and applied field direction. Our
+study opens new avenues for the design of superconducting spin-valves.",2009.14592v1
+2020-11-01,Fermi polaron in a dissipative bath with spin-orbit coupling,"We study the polaron problem of an impurity immersed in a dissipative
+spin-orbit coupled Fermi gas via a non-self-consistent T-matrix method. We
+first propose an experimental scheme to realize a spin-orbit coupled Fermi bath
+with dissipation, and show that such a system can be described by a
+non-Hermitian Hamiltonian that contains an imaginary spin-flip term and an
+imaginary constant shift term. We find that the non-Hermiticity will change the
+single particle dispersion of the bath gas, and modify the properties of
+attractive and repulsive polarons such as energy, quasi-particle residue,
+effective mass, and decay rate. We also investigate the Thouless criteria
+corresponding to the instability of the polaron molecule transition, which
+suggests a molecule state is more facilitated with stronger bath dissipation.
+Finally, we consider the case with finite impurity density and calculate the
+interaction between polarons. Our result extends the study of polaron physics
+to non-Hermitian systems and may be realized in future experiment.",2011.00461v1
+2021-09-10,Topological superfluids in two-dimensional Fermi gas with Rashba spin-orbit coupling,"The realization of spin-orbit coupling (SOC) in ultracold atoms has triggered
+an intensive exploring of topological superfluids in the degenerate Fermi gases
+based on mean-field theory, which has not yet been reported in experiments.
+Here, we demonstrate the topological phase transitions in the system via the
+numerically exact quantum Monte Carlo method. Without prior assumptions, our
+unbiased real-space calculation shows that spin-orbit coupling can stabilize an
+unconventional pairing in the weak SOC regime, in which the
+Fulde-Ferrell-Larkin-Ovchinnikov pairing coexists with the
+Bardeen-Cooper-Schrieffer pairing. Furthermore, we use the jumps in the spin
+polarization at the time-reversal invariant momenta to qualify the topological
+phase transition, where we find the critical exponent deviated from the
+mean-field theory. Our results pave the way for the searching of unconventional
+pairing and topological superfluids with degenerate Fermi gases.",2109.04670v1
+2021-12-28,Topological viewpoint of two-dimensional group III-V and IV-IV compounds in the presence of electric field and spin-orbit coupling by density functional theory and tight-binding model,"Using the tight-binding model and density functional theory, the topological
+invariant of the two-dimensional (2D) group III-V and IV-IV compounds are
+studied in the absence and the presence of an external perpendicular electric
+field and spin-orbit coupling. It will be recognized that a critical value of
+these parameters changes the topological invariant of 2D graphene-like
+compounds. The significant effects of an external electric field and spin-orbit
+coupling are considered to the two-center overlap integrals of the
+Slater-Koster model involved in band structures, changing band-gap, and tuning
+the topological phase transition between ordinary and quantum spin Hall regime.
+These declare the good consistency between two theories: tight-binding and
+density functional. So, this study reveals topological phase transition in
+these materials. Our finding paves a way to extend an effective Hamiltonian,
+and may instantly clear some computation aspects of the study in the field of
+spintronic based on the first-principles methods.",2112.14155v2
+2022-01-14,Supersolid Devil's Staircases of Spin-Orbit-Coupled Bosons in Optical Lattices,"We study the emergence of supersolid Devil's staircases of spin-orbit coupled
+bosons loaded in optical lattices. We consider two- and three-dimensional
+systems of pseudo-spin-$1/2$ bosons interacting via local spin-dependent
+interactions. These interactions together with spin-orbit coupling produce
+length scales that are commensurate to the lattice spacing. This
+commensurability leads to Devil's staircases of supersolids, with fractal
+Hausdorff dimensions, which arise from uniform superfluid phases. We show that
+umklapp processes are essential for the existence of commensurate supersolids,
+and that without them the Devil's staircase does not exist. Lastly, we
+emphasize the generality of our results, suggest experiments that can unveil
+these unusual predictions, and discuss potential applications to the case of
+$^{87}$Rb.",2201.05372v1
+2022-10-17,Rashba spin-orbit coupling in the square lattice Hubbard model: A truncated-unity functional renormalization group study,"The Rashba-Hubbard model on the square lattice is the paradigmatic case for
+studying the effect of spin-orbit coupling, which breaks spin and inversion
+symmetry, in a correlated electron system. We employ a truncated-unity variant
+of the functional renormalization group which allows us to analyze magnetic and
+superconducting instabilities on equal footing. We derive phase diagrams
+depending on the strengths of Rasbha spin-orbit coupling, real second-neighbor
+hopping and electron filling. We find commensurate and incommensurate magnetic
+phases which compete with d-wave superconductivity. Due to the breaking of
+inversion symmetry, singlet and triplet components mix; we quantify the mixing
+of d-wave singlet pairing with f-wave triplet pairing.",2210.09384v2
+2022-11-18,Skew scattering by magnetic monopoles and anomalous Hall effect in spin-orbit coupled systems,"Magnetic textures like skyrmions and domain walls coupled to itinerant
+electrons give rise to rich transport phenomena such as anomalous Hall effect
+and nonreciprocal current. An interesting case is when the transport
+coefficient is related to the global (or topological) property of the magnetic
+texture, e.g., skyrmion and domain wall numbers. Such phenomena are also
+interesting from applications, in which the transport phenomena are potential
+probes for electrically detecting magnetic textures in nano-scale devices.
+Here, we show that an anomalous Hall effect proportional to the net magnetic
+monopole charge occurs from skew scattering when the magnetic texture couples
+to itinerant electrons in a non-centrosymmetric system with spin-orbit
+interaction. This mechanism gives rise to a finite anomalous Hall effect in a
+ferromagnetic domain wall whose spins rotate in the $xy$ plane, despite no
+out-of-plane magnetic moment. We also discuss the relation between the magnetic
+texture contributing to the anomalous Hall effect and the crystal symmetry. The
+results demonstrate rich features arising from the interplay of spin-orbit
+interaction and magnetic textures and their potential for detecting various
+magnetic textures in nanoscale devices.",2211.10180v1
+2023-01-11,Correlated Zak insulator in organic antiferromagnets,"Searching for topological insulators in solids is one of the main issues of
+modern condensed matter physics since robust gapless edge or surface states of
+the topological insulators can be used as building blocks of next-generation
+devices. Enhancing spin-orbit couplings is a promising way to realize
+topological insulators in solids, whereas the amplitude of the spin-orbit
+couplings is not sufficiently large in most materials. Here we show a way to
+realize a topological state characterized by the quantized Zak phase, termed
+the Zak insulator, with spin-polarized edges in organic antiferromagnetic Mott
+insulators without relying on the spin-orbit coupling. The obtained Zak
+insulator can have a large charge gap compared to the conventional topological
+insulators, since Coulomb interactions mainly govern the amplitude of the
+charge gap in the antiferromagnetic Mott insulators. Besides the mean-field
+analysis, we demonstrate that the Zak insulator survives against electron
+correlation effects by calculating the many-body Zak phase. Our finding
+provides an unprecedented way to realize a topological state in strongly
+correlated electron systems.",2301.04490v2
+2023-04-17,Spin-orbit coupled Hubbard skyrmions,"When the material phases exhibit topological quantum numbers, they host
+defects protected by the nontrivial topology. Magnetic skyrmions are such
+``quantized"" objects and although many of them are metals they had been most
+likely treated in theories as purely classical spin states. Here, we show that
+the electrons described by the Hubbard model with strong spin-orbit couplings
+can exhibit various nano- or flake-size skyrmions in their ground state.
+Importantly, the conducting electrons forming Fermi pockets themselves carry
+textured magnetic moments in both real and momentum space and on that top,
+possess Chern numbers in their energy bands. This quantum and conducting
+skyrmion is related to small skyrmions observed in atomic-layered compounds. We
+clarify how the effective magnetic interactions and magnetic anisotropies are
+tied to the spin-orbit coupling, and how they influence the stability of
+skyrmions beyond the phenomenology.",2304.08199v2
+2023-10-12,Weyl points and spin-orbit coupling in copper-substituted lead phosphate apatite,"We study the impact of spin-orbit coupling on the topological band-properties
+of copper-substituted lead phosphate apatite using a combination of
+group-theoretical analysis and full-relativistic density-functional theory
+calculations. We characterize Weyl points at time-reversal invariant momenta
+and find that a band-inversion due to spin-orbit coupling leads to additional
+Weyl points close to the Fermi-edge at general momenta. To determine the
+position of the altogether 66 Weyl points in the Brilouin-zone, we develop an
+algorithm that follows a Berry-curvature-derived vector field to its monopole:
+the Weyl point. The emerging surface Fermi-arcs and their spin-polarization
+reveal avoided crossings and a Fermi-loop detached from the Weyl points.",2310.09310v1
+2024-03-15,Effects of spin-orbit coupling in a valley chiral kagomé network,"Valley chiral kagom\'e networks can arise in various situations, like for
+example, in double-aligned graphene-hexagonal boron nitride and periodically
+strained graphene. Here, we construct a phenomenological scattering model based
+on the symmetries of the network to investigate the energy spectrum and
+magnetotransport in this system. Additionally, we consider the effects of a
+finite Rashba spin-orbit coupling on the transport properties of the kagom\'e
+network. We identify conditions where the interplay of the Rashba spin-orbit
+coupling and the geometry of the lattice results in a reduction of the
+periodicity of the magnetoconductance and characteristic sharp resonances.
+Moreover, we find a finite spin-polarization of the conductance, which could be
+exploited in spintronic devices.",2403.10181v1
+2014-02-27,Enhanced Stability of Skyrmions in Two-Dimensional Chiral Magnets with Rashba Spin-Orbit Coupling,"Recent developments have led to an explosion of activity on skyrmions in
+three-dimensional (3D) chiral magnets. Experiments have directly probed these
+topological spin textures, revealed their nontrivial properties, and led to
+suggestions for novel applications. However, in 3D the skyrmion crystal phase
+is observed only in a narrow region of the temperature-field phase diagram. We
+show here, using a general analysis based on symmetry, that skyrmions are much
+more readily stabilized in two-dimensional (2D) systems with Rashba spin-orbit
+coupling. This enhanced stability arises from the competition between field and
+easy-plane magnetic anisotropy and results in a nontrivial structure in the
+topological charge density in the core of the skyrmions. We further show that,
+in a variety of microscopic models for magnetic exchange, the required
+easy-plane anisotropy naturally arises from the same spin-orbit coupling that
+is responsible for the chiral Dzyaloshinskii-Moriya interactions. Our results
+are of particular interest for 2D materials like thin films, surfaces, and
+oxide interfaces, where broken surface-inversion symmetry and Rashba spin-orbit
+coupling naturally lead to chiral exchange and easy-plane compass anisotropy.
+Our theory gives a clear direction for experimental studies of 2D magnetic
+materials to stabilize skyrmions over a large range of magnetic fields down to
+T=0.",1402.7082v2
+2012-01-06,Half-quantum vortex state in a spin-orbit coupled Bose-Einstein condensate,"We investigate theoretically the condensate state and collective excitations
+of a two-component Bose gas in two-dimensional harmonic traps subject to
+isotropic Rashba spin-orbit coupling. In the weakly interacting regime when the
+inter-species interaction is larger than the intra-species interaction
+($g_{\uparrow\downarrow}>g$), we find that the condensate ground state has a
+half-quantum-angular-momentum vortex configuration with spatial rotational
+symmetry and skyrmion-type spin texture. Upon increasing the interatomic
+interaction beyond a threshold $g_{c}$, the ground state starts to involve
+higher-order angular momentum components and thus breaks the rotational
+symmetry. In the case of $g_{\uparrow\downarrow}<g$, the condensate becomes
+unstable towards the superposition of two degenerate half-quantum vortex
+states. Both instabilities (at $g>g_{c}$ and $g_{\uparrow\downarrow}<g$) can be
+determined by solving the Bogoliubov equations for collective density
+oscillations of the half-quantum vortex state, and by analyzing the softening
+of mode frequencies. We present the phase diagram as functions of the
+interatomic interactions and the spin-orbit coupling. In addition, we directly
+simulate the time-dependent Gross-Pitaevskii equation to examine the dynamical
+properties of the system. Finally, we investigate the stability of the
+half-quantum vortex state against both the trap anisotropy and anisotropy in
+the spin-orbit coupling term.",1201.1471v1
+2012-01-29,Collective Dipole Oscillation of a Spin-Orbit Coupled Bose-Einstein Condensate,"We present an experimental study of the collective dipole oscillation of a
+spin-orbit coupled Bose-Einstein condensate in a harmonic trap. Dynamics of the
+center-of-mass dipole oscillation is studied in a broad parameter region, as a
+function of spin-orbit coupling parameters as well as oscillation amplitude.
+Anharmonic properties beyond effective-mass approximation are revealed, such as
+amplitude-dependent frequency and finite oscillation frequency at place with
+divergent effective mass. These anharmonic behaviors agree quantitatively with
+variational wave-function calculations. Moreover, we experimentally demonstrate
+a unique feature of spin-orbit coupled system predicted by a sum-rule approach,
+stating that spin polarization susceptibility--a static physical quantity--can
+be measured via dynamics of dipole oscillation. The divergence of polarization
+susceptibility is observed at the quantum phase transition that separates
+magnetic nonzero-momentum condensate from nonmagnetic zero-momentum phase. The
+good agreement between the experimental and theoretical results provides a
+bench mark for recently developed theoretical approaches.",1201.6018v2
+2019-09-25,Van der Waals heterostructures with spin-orbit coupling,"In this article we review recent work on van der Waals (vdW) systems in which
+at least one of the components has strong spin-orbit coupling. We focus on a
+selection of vdW heterostructures to exemplify the type of interesting
+electronic properties that can arise in these systems. We first present a
+general effective model to describe the low energy electronic degrees of
+freedom in these systems. We apply the model to study the case of (vdW) systems
+formed by a graphene sheet and a topological insulator. We discuss the
+electronic transport properties of such systems and show how they exhibit much
+stronger spin-dependent transport effects than isolated topological insulators.
+We then consider vdW systems in which the layer with strong spin-orbit coupling
+is a monolayer transition metal dichalcogenide (TMD) and briefly discuss
+graphene-TMD systems. In the second part of the article we discuss the case in
+which the vdW system includes a superconducting layer in addition to the layer
+with strong spin-orbit coupling. We show in detail how these systems can be
+designed to realize odd-frequency superconducting pair correlations. Finally,
+we discuss twisted graphene-NbSe2 bilayer systems as an example in which the
+strength of the proximity-induced superconducting pairing in the normal layer,
+and its Ising character, can be tuned via the relative twist angle between the
+two layers forming the heterostructure.",1909.11674v2
+2021-06-26,Role of line defect in the bandgap and transport properties of silicene nanoribbons,"By using the tight-binding model and non-equilibrium Green's function method
+(NEGF), we study the band structures and transport properties of a silicene
+nanoribbon with a line defect where a bulk energy gap is opened due to the
+sublattice symmetry breaking. The flat subband bends downwards or upwards due
+to the effect of the line defect. The spin-orbit coupling induces quantum spin
+Hall states. Especially, the energy band depends on the distance between the
+line defect and the edge of the nanoribbon. The effects of the on-site energies
+on the band spectra of the two defect configurations are different. There
+always exists one band gap for different on-site energies for the defect
+configuration of case 1. However, a gapless state and a band gap can be
+modulated by changing the on-site energy, the sublattice potential and
+spin-orbit couplings for the defect configuration of case 2. Accordingly, the
+variation trends of the conductance including zero conductance can be well
+understood in terms of the combined effect of the sublattice potential, the
+on-site energy and spin-orbit couplings on the band structures. Thus it is easy
+and effective to modulate the transport property of the silicene nanoribbon
+with the defect configuration of case 2 by utilizing the sublattice potential,
+the on-site energy and spin-orbit couplings. This study is of great
+significance for the fabrication and the modulation of the transport property
+of silicene-based devices.",2106.14062v1
+2009-02-26,Effects of Magnetic Braking and Tidal Friction on Hot Jupiters,"Tidal friction is thought to be important in determining the long-term
+spin-orbit evolution of short-period extrasolar planetary systems. Using a
+simple model of the orbit-averaged effects of tidal friction Eggleton, Kiseleva
+& Hut (1998), we analyse the effects of the inclusion of stellar magnetic
+braking on the evolution of such systems. A phase-plane analysis of a
+simplified system of equations, including only the stellar tide together with a
+model of the braking torque proposed by Verbunt & Zwaan (1981), is presented.
+The inclusion of stellar magnetic braking is found to be extremely important in
+determining the secular evolution of such systems, and its neglect results in a
+very different orbital history. We then show the results of numerical
+integrations of the full tidal evolution equations, using the misaligned spin
+and orbit of the XO-3 system as an example, to study the accuracy of simple
+timescale estimates of tidal evolution. We find that it is essential to
+consider coupled evolution of the orbit and the stellar spin in order to model
+the behaviour accurately. In addition, we find that for typical Hot Jupiters
+the stellar spin-orbit alignment timescale is of the same order as the inspiral
+time, which tells us that if a planet is observed to be aligned, then it
+probably formed coplanar. This reinforces the importance of Rossiter-McLaughlin
+effect observations in determining the degree of spin-orbit alignment in
+transiting systems.",0902.4554v1
+2004-10-26,Orbital Physics in the Perovskite Ti Oxides,"In the perovskite Ti oxide RTiO3 (R=rare-earth ions), the Ti t2g orbitals and
+spins in the 3d^1 state couple each other through the strong electron
+correlations, resulting in a rich variety of orbital-spin phases. The origin
+and nature of orbital-spin states of these Mott insulators have been
+intensively studied. In this article, we review the studies on orbital physics
+in the perovskite titanates. We focus on the following three topics: (1) the
+origin and nature of the ferromagnetism as well as the orbital ordering in the
+compounds with relatively small R ions such as GdTiO3 and YTiO3, (2) the origin
+of the G-type antiferromagnetism and the orbital state in LaTiO3, and (3) the
+orbital-spin structures in other AFM(G) compounds with relatively large R ions
+(R=Ce, Pr, Nd and Sm). On the basis of these discussions, we discuss the whole
+phase diagram together with mechanisms of the magnetic phase transition. We
+also show that the Ti t2g degeneracy is inherently lifted in the titanates,
+which allows the single-band descriptions of the ground-state and low-energy
+electronic structures as a good starting point. Our analyses indicate that
+these compounds offer touchstone materials described by the single-band Hubbard
+model on the cubic lattice. From this insight, we also reanalyze the hole-doped
+titanates. Experimentally revealed filling-dependent and bandwidth-dependent
+properties and the critical behavior of the metal-insulator transitions are
+discussed in the light of theories based on the single-band Hubbard models.",0410650v1
+2013-01-17,Defect states and spin-orbital physics in doped vanadates Y1-xCaxVO3,"We present a model for typical charged defects in weakly doped Y1-xCaxVO3
+perovskites and study how they influence the magnetic and orbital order.
+Starting from a multiband Hubbard model, we show that the charge carriers
+introduced by doping are bound to the Ca defects with large binding energy of
+about 1 eV at small doping, and give rise to the in-gap absorption band
+observed in the optical spectroscopy. The central position of a generic Ca
+defect with eight equidistant vanadium neighbors implies a partly filled defect
+band and permits activated transport due to Coulomb disorder. We explore the
+effect of bound charge carriers on the dynamics of the (yz,zx) orbital and spin
+degrees of freedom in the context of a spin-orbital t-J model. After deriving
+the superexchange interactions around the doped hole, we show that the
+transition from G-type to C-type antiferromagnetic (AF) order is triggered by
+the kinetic energy of doped holes via the double-exchange mechanism. The defect
+states lead to local modification of orbital correlations within ferromagnetic
+chains along the c axis; some of them contain hole defects, while the
+charge-orbital coupling suppresses locally (yz,zx) orbital fluctuations in the
+others. Thereby, Ca defects provide a physical mechanism for spin-orbital
+dimerization along the ferromagnetic bonds, suggesting that, in the C-AF phase
+of weakly doped Y1-xCaxVO3, dimerization increases with doping.",1301.4026v1
+2004-11-25,Spin Hall Effect in a Diffusive Rashba Two-dimensional Electron Gas,"A nonequilibrium Green's functions approach to spin-Hall effect is developed
+in a diffusive two-dimensional electron system with Rashba spin-orbit
+interaction. In the presence of long-range impurities, the coupled quantum
+kinetic equations are solved analytically in the self-consistent Born
+approximation. It is shown that the intrinsic spin-Hall effect stems from the
+dc-field-induced perturbation of the density of states. In addition, there is
+an additional disorder-mediated process, which involves the transition of
+nonequilibrium electrons between two spin-orbit-coupled bands. It results in an
+additional collision-independent spin-Hall conductivity and leads to the
+vanishing of the total spin-Hall current even at nonzero temperature.",0411629v2
+2006-02-27,Intrinsic Spin Hall Effect in the presence of Extrinsic Spin-Orbit Scattering,"Intrinsic and extrinsic spin Hall effects are considered together on an equal
+theoretical footing for the Rashba spin-orbit coupling in two-dimensional (2D)
+electron and hole systems, using the diagrammatic method for calculating the
+spin Hall conductivity. Our analytic theory for the 2D holes shows the expected
+lowest-order additive result for the spin Hall conductivity. But, the 2D
+electrons manifest a very surprising result, exhibiting a non-analyticity in
+the Rashba coupling strength $\alpha$ where the strictly extrinsic spin Hall
+conductivity (for $\alpha = 0$) cannot be recovered from the $\alpha \to 0$
+limit of the combined theory. The theoretical results are discussed in the
+context of existing experimental results.",0602607v1
+2006-10-11,Spin relaxation in an InAs quantum dot in the presence of terahertz driving fields,"The spin relaxation in a 1D InAs quantum dot with the Rashba spin-orbit
+coupling under driving THz magnetic fields is investigated by developing the
+kinetic equation with the help of the Floquet-Markov theory, which is
+generalized to the system with the spin-orbit coupling, to include both the
+strong driving field and the electron-phonon scattering. The spin relaxation
+time can be effectively prolonged or shortened by the terahertz magnetic field
+depending on the frequency and strength of the terahertz magnetic field. The
+effect can be understood as the sideband-modulated spin-phonon scattering. This
+offers an additional way to manipulate the spin relaxation time.",0610300v2
+2007-01-10,Electron Density Dependence of in-plane Spin Relaxation Anisotropy in GaAs/AlGaAs Two-Dimensional Electron Gas,"We investigated the spin dynamics of two-dimensional electrons in (001)
+GaAs/AlGaAs heterostructure using the time resolved Kerr rotation technique
+under a transverse magnetic field. The in-plane spin lifetime is found to be
+anisotropic below 150k due to the interference of Rashba and Dresselhaus
+spin-orbit coupling and D'yakonov-Perel' spin relaxation. The ratio of in-plane
+spin lifetimes is measured directly as a function of temperature and pump
+power, showing that the electron density in 2DEG channel strongly affects the
+Rashba spin-orbit coupling.",0701195v2
+2008-01-17,Spin polarized current generation from quantum dots without magnetic fields,"An unpolarized charge current passing through a chaotic quantum dot with
+spin-orbit coupling can produce a spin polarized exit current without magnetic
+fields or ferromagnets. We use random matrix theory to estimate the typical
+spin polarization as a function of the number of channels in each lead in the
+limit of large spin-orbit coupling. We find rms spin polarizations up to 45%
+with one input channel and two output channels. Finite temperature and
+dephasing both suppress the effect, and we include dephasing effects using a
+new variation of the third lead model. If there is only one channel in the
+output lead, no spin polarization can be produced, but we show that dephasing
+lifts this restriction.",0801.2592v2
+2008-02-04,Current-induced spin polarization in spin-orbit-coupled two-dimensional electron systems,"Current-induced spin polarization (CISP) is rederived in ballistic
+spin-orbit-coupled electron systems, based on equilibrium statistical
+mechanics. A simple and useful picture is correspondingly proposed to help
+understand the CISP and predict the polarization direction. Nonequilibrium
+Landauer-Keldysh formalism is applied to demonstrate the validity of the
+statistical picture, taking the linear Rashba-Dresselhaus [001] two-dimensional
+system as a specific example. Spin densities induced by the CISP in
+semiconductor heterostructures and in metallic surface states are compared,
+showing that the CISP increases with the spin splitting strength and hence
+suggesting that the CISP should be more observable on metal and semimetal
+surfaces due to the discovered strong Rashba splitting. An application of the
+CISP designed to generate a spin-Hall pattern in the inplane, instead of the
+out-of-plane, component is also proposed.",0802.0366v3
+2008-03-07,Conservation and persistence of spin currents and their relation to the Lieb-Schulz-Mattis twist operators,"Systems with spin-orbit coupling do not conserve ""bare"" spin current
+$\bf{j}$. A recent proposal for a conserved spin current $\bf{J}$ [J. Shi {\it
+et.al} Phys. Rev. Lett. {\bf 96}, 076604 (2006)] does not flow persistently in
+equilibrium. We suggest another conserved spin current $\bar{\bf{J}}$ that may
+flow persistently in equilibrium. We give two arguments for the instability of
+persistent current of the form $\bf{J}$: one based on the equations of motions
+and another based on a variational construction using Lieb-Schulz-Mattis twist
+operators. In the absence of spin-orbit coupling, the three forms of spin
+current coincide.",0803.0984v2
+2008-04-15,Surface bound states and spin currents in non-centrosymmetric superconductors,"We investigate the influence of spin-orbit coupling in a non-centrosymmetric
+superconductor on its ground state properties near a surface. We determine the
+spectrum of Andreev bound states due to surface-induced mixing of bands with
+opposite spin helicities for a Rashba-type spin-orbit coupling. We find a
+qualitative change of the Andreev spectrum when we account for the suppression
+of the order parameter near the surface, leading to clear signatures in the
+surface density of states. We also compute the spin current at the surface,
+which has spin polarization normal to that of the bulk current. The magnitude
+of the current at the surface is enhanced in the normal state compared to the
+bulk, and even further enlarged in the superconducting phase. The particle and
+hole coherence amplitudes show Faraday-like rotations of the spin along
+quasiparticle trajectories.",0804.2464v1
+2008-06-16,Density dependence of spin relaxation in GaAs quantum well at room temperature,"Carrier density dependence of electron spin relaxation in an intrinsic GaAs
+quantum well is investigated at room temperature using time-resolved circularly
+polarized pump-probe spectroscopy. It is revealed that the spin relaxation time
+first increases with density in the relatively low density regime where the
+linear D'yakonov-Perel' spin-orbit coupling terms are dominant, and then tends
+to decrease when the density is large and the cubic D'yakonov-Perel' spin-orbit
+coupling terms become important. These features are in good agreement with
+theoritical predictions by L\""u {\em et al.} [Phys. Rev. B {\bf 73}, 125314
+(2006)]. A fully microscopic calculation based on numerically solving the
+kinetic spin Bloch equations with both the D'yakonov-Perel' and the
+Bir-Aronov-Pikus mechanisms included, reproduces the density dependence of spin
+relaxation very well.",0806.2577v2
+2010-07-27,Simulating and Detecting the Quantum Spin Hall Effect in Kagomé Optical Lattice,"We propose a model which includes a nearest-neighbor intrinsic spin-orbit
+coupling and a dimer Hamiltonian in the Kagom\'{e} lattice and promises to host
+the transition from the quantum spin Hall insulator to the normal insulator. In
+addition, we design an experimental scheme to simulate and detect this
+transition in the ultracold atom system. The lattice intrinsic spin-orbit
+coupling is generated via the laser-induced-gauge-field method. Furthermore, we
+establish the connection between the spin Chern number and the spin-atomic
+density which enables us to detect the topological quantum spin Hall insulator
+directly by the standard density-profile technique used in the atomic systems.",1007.4637v2
+2011-02-23,Spin relaxation near the metal-insulator transition: dominance of the Dresselhaus spin-orbit coupling,"We identify the Dresselhaus spin-orbit coupling as the source of the dominant
+spin-relaxation mechanism in the impurity band of doped semiconductors. The
+Dresselhaus-type (i.e. allowed by bulk-inversion asymmetry) hopping terms are
+derived and incorporated into a tight-binding model of impurity sites, and they
+are shown to unexpectedly dominate the spin relaxation, leading to
+spin-relaxation times in good agreement with experimental values. This
+conclusion is drawn from two complementary approaches employed to extract the
+spin-relaxation time from the effective Hamiltonian: an analytical
+diffusive-evolution calculation and a numerical finite-size scaling.",1102.4753v1
+2011-03-24,Novel Spin-texture on the warped Dirac-cone surface states in topological insulators,"We have investigated the nature of surface states in the Bi2Te3 family of
+three-dimensional topological insulators using first-principles calculations as
+well as model Hamiltonians. When the surface Dirac cone is warped due to
+Dresselhaus spin-orbit coupling in rhombohedral structures, the spin acquires a
+finite out-of-plane component. We predict a novel in-plane spin-texture of the
+warped surface Dirac cone with spins not perpendicular to the electron
+momentum. Our k.p model calculation reveals that this novel in-plane
+spin-texture requires high order Dresselhaus spin-orbit coupling terms.",1103.4675v1
+2013-03-31,Electrical current and coupled electron-nuclear spin dynamics in double quantum dots,"We examine electronic transport in a spin-blockaded double quantum dot. We
+show that by tuning the strength of the spin-orbit interaction the current
+flowing through the double dot exhibits a dip at zero magnetic field or a peak
+at a magnetic field for which the two-electron energy levels anticross. This
+behaviour is due to the dependence of the singlet-triplet mixing on the field
+and spin-orbit amplitude. We derive approximate expressions for the current as
+a function of the amplitudes of the states involved in the transport. We also
+consider an alternative model that takes into account a finite number of
+nuclear spins and study the resulting coupled dynamics between electron and
+nuclear spins. We show that if the spin ensemble is in a thermal state there
+are regular oscillations in the transient current followed by quasi-chaotic
+revivals akin to those seen in a thermal Jaynes-Cummings model.",1304.0169v1
+2013-04-16,Gauge-spin-space rotation invariant vortices in spin-orbit coupled Bose-Einstein condensates,"We revisit ground states of spinor Bose-Einstein condensates with a Rashba
+spin-orbit coupling, and find that votices show up as a direct consequence of
+spontaneous symmetry breaking into a combined gauge, spin, and space rotation
+symmetry, which determines the vortex-core spin state at the rotating center.
+For the continuous combined symmetry, the total spin rotation about the
+rotating axis is restricted to $2\pi$, whereas for the discrete combined
+symmetry, we further need 2F quantum numbers to characterize the total spin
+rotation for the spin-$F$ system. For lattice phases we find that in the ground
+state the topological charge for each unit cell vanishes. However, we find two
+types of highly symmetric lattices with a nontrivial topological charge in the
+spin-$\frac{1}{2}$ system based on the symmetry classification, and show that
+they are skyrmion crystals.",1304.4340v1
+2013-04-17,Angular dependence and symmetry of Rashba spin torque in ferromagnetic heterostructures,"In a ferromagnetic heterostructure, the interplay between a Rashba spin-orbit
+coupling and an exchange field gives rise to a current-driven spin torque. In a
+realistic device setup, we investigate the Rashba spin torque in the diffusive
+regime and report two major findings: (i) a nonvanishing torque exists at the
+edges of the device even when the magnetization and effective Rashba field are
+aligned; (ii) anisotropic spin relaxation rates driven by the Rashba spin-orbit
+coupling assign the spin torque a general expression ${\bm
+T}=T^y_{\para}(\theta){\bm m}\times(\hat{\bm y}\times{\bm
+m})+T^y_{\bot}(\theta)\hat{\bm y}\times{\bm m}+T^z_{\para}(\theta){\bm
+m}\times(\hat{\bm z}\times{\bm m})+T^z_{\bot}(\theta)\hat{\bm z}\times{\bm m}$,
+where the coefficients $T_{\para,\bot}^{y,z}$ depend on the magnetization
+direction. Our results agree with recent experiments.",1304.4823v1
+2013-12-30,Indirect control of spin precession by electric field via spin-orbit coupling,"The spin-orbit coupling (SOC) can mediate electric-dipole spin resonance
+(EDSR) in an a.c. electric field. In this letter, the EDSR is essentially
+understood as an spin precession under an effective a.c. magnetic field induced
+by the SOC in the reference frame, which is exactly following the classical
+trajectory of the electron and obtained by applying a quantum linear coordinate
+transformation. With this observation for one-dimensional (1D) case, we find a
+upper limit for the spin-flipping speed in the EDSR-based control of spin,
+which is given by the accessible data from the current experiment. For
+two-dimensional case, the azimuthal dependence of the effective magnetic field
+can be used to measure the ratio of the Rashba and Dresselhause SOC strengths.",1312.7635v3
+2014-10-24,Spin-orbit coupled transport in a curved quantum wire,"We study the interplay of both Rashba and Dresselhaus spin-orbit couplings
+(SOCs) and a uniform perpendicular magnetic field $\textbf{B}$ on the transport
+of a spin-polarized electron along a curved quantum wire. Eigenenergies and
+eigenfunctions of the system were analytically solved in the presence of both
+SOCs for a confinement radius $R$. From the transmission coefficients, the spin
+transport properties such as spin polarization, probability current density and
+spin conductance were computed numerically to determine their dependence on the
+SOCs, $\textbf{B}$ and $R$. We find the condition for $\textbf{B}$ that if it
+is beyond $R^{1/3}$, no spin reversal will occur. Our results show that for a
+sufficiently large SOC strength, regardless of its inversion asymmetry origin,
+the effect of the external magnetic field is reduced. Finding the optimal
+effective SOC strength is essential in achieving suitable magneto-transport
+properties for possible spintronic device applications.",1410.6595v1
+2014-12-22,Transport Theory of Metallic B20 Helimagnets,"B20 compounds are a class of cubic helimagnets harboring nontrivial spin
+textures such as spin helices and skyrmions. It has been well understood that
+the Dzyaloshinskii-Moriya (DM) interaction is the origin of these textures, and
+the physics behind the DM interaction is the spin-orbital coupling (SOC).
+However the SOC shows its effect not only on the spins, but also on the
+electrons. In this paper, we will discuss effects of the SOC on the electron
+and spin transports in B20 compounds. An effective Hamiltonian is presented
+from symmetry analysis, and the spin-orbital coupling therein shows anomalous
+behaviors in anisotropic magnetoresistance (AMR) and helical resistance. New
+effects such as inverse spin-galvanic effect is proposed, and the origin of the
+DM interaction is discussed.",1412.7177v1
+2015-04-09,Spin Textures of Polariton Condensates in a Tunable Microcavity with Strong Spin-Orbit Interaction,"We report an extended family of spin textures in coexisting modes of
+zero-dimensional polariton condensates spatially confined in tunable open
+microcavity structures. The coupling between photon spin and angular momentum,
+which is enhanced in the open cavity structures, leads to new eigenstates of
+the polariton condensates carrying quantised spin vortices. Depending on the
+strength and anisotropy of the cavity confinement potential and the strength of
+the spin-orbit coupling, which can be tuned via the excitonic/photonic
+fractions, the condensate emissions exhibit either spin-vortex-like patterns or
+linear polarization, in good agreement with theoretical modelling.",1504.02341v1
+2017-04-05,Tuning the effective spin-orbit coupling in molecular semiconductors,"The control of spins and spin to charge conversion in organics requires
+understanding the molecular spin-orbit coupling (SOC), and a means to tune its
+strength. However, quantifying SOC strengths indirectly through spin relaxation
+effects has proven diffi- cult due to competing relaxation mechanisms. Here we
+present a systematic study of the g-tensor shift in molecular semiconductors
+and link it directly to the SOC strength in a series of high mobility molecular
+semiconductors with strong potential for future devices. The results
+demonstrate a rich variability of the molecular g-shifts with the effective
+SOC, depending on subtle aspects of molecular composition and structure. We
+correlate the above g -shifts to spin-lattice relaxation times over four orders
+of magnitude, from 200 {\mu}s to 0.15 {\mu}s, for isolated molecules in
+solution and relate our findings for isolated molecules in solution to the spin
+relaxation mechanisms that are likely to be relevant in solid state systems.",1704.01371v2
+2019-07-16,Current-driven Rashba Field in a Magnetic Quantum Well,"In materials lacking inversion symmetry, the spin-orbit coupling enables the
+direct connection between the electron's spin and its linear momentum, a
+phenomenon called inverse spin galvanic effect. In magnetic materials, this
+effect promotes current-driven torques that can be used to control the
+magnetization direction electrically. In this work, we investigate the
+current-driven inverse spin galvanic effect in a quantum well consisting in a
+magnetic material embedded between dissimilar insulators. Assuming the presence
+of Rashba spin-orbit coupling at the interfaces, we investigate the nature of
+the non-equilibrium spin density and the influence of the quantum well
+parameters. We find that the torque is governed by the interplay between the
+number of states participating to the transport and their spin chirality, the
+penetration of the wave function into the tunnel barriers, and the strength of
+the Rashba term.",1907.07116v1
+2017-11-16,Phonon-assisted spin splitting in centrosymmetric crystals,"For static crystals it is well known that electronic states are doubly
+degenerate in their spin degree of freedom in the presence of time reversal and
+inversion symmetries. This degeneracy can only be lifted by either (i) breaking
+time reversal symmetry, for example in a ferromagnet, or (ii) breaking
+inversion symmetry and having spin orbit coupling, for example in the Rashba
+effect. We propose that spin degeneracy can be lifted in time reversal and
+inversion symmetric crystals with a combination of lattice vibrations and
+spin-orbit coupling. We demonstrate this effect in the cubic perovskite
+CsPbCl$_3$ by performing first principles calculations of the finite
+temperature band structure, which, in accordance with our prediction, undergoes
+spin splitting. We also suggest optical and photoemission experiments to
+examine our predictions. This new understanding dramatically expands the range
+of materials that can exhibit spin splitting, with potential applications in a
+variety of technologies such as spintronics and photovoltaics.",1711.06274v1
+2018-08-01,Synthesizing and Controlling Helical Indirect Exchange Interactions at Nonequilibrium,"We study the nonequilibrium effects of spin and/or electric currents on the
+helical indirect exchange interactions of local spins that embedded in general
+open electronic systems. Especially, besides the synthesized anisotropic
+Heisenberg interactions, we find that the synthetic helical indirect exchange
+interactions possess two parts: antisymmetric (Dzyaloshinskii-Moriya
+interaction) and symmetric (Kaplan-Shekhtman-Entin-Wohlman-Aharony
+interaction), which are all formulated in terms of Keldysh nonequilibrium
+Green's functions. The presence of either spin-orbit coupling or spin polarized
+currents alone is able to synthesize and control the antisymmetric
+Dzyaloshinskii-Moriya exchange interactions, as the same direction as spin
+splitting. However, the appearance of symmetric
+Kaplan-Shekhtman-Entin-Wohlman-Aharony interactions requires both, i.e., the
+spin-orbit coupling and spin polarized currents with different splitting
+directions. Our results show the detailed scheme of controlling the sign,
+magnitude, and direction of indirect Dzyaloshinskii-Moriya vectors and
+Kaplan-Shekhtman-Entin-Wohlman-Aharony interactions at nonequilibrium in open
+quantum devices.",1808.00187v1
+2020-03-30,Adiabatic spin-dependent momentum transfer in an SU(N) degenerate Fermi gas,"We introduce a spin-orbit coupling scheme, where a retro-reflected laser beam
+selectively diffracts two spin components in opposite directions. Spin
+sensitivity is provided by sweeping through a magnetic-field sensitive
+transition while dark states ensure that spontaneous emission remains low. The
+scheme is adiabatic and thus inherently robust. This tailored spin-orbit
+coupling allows simultaneous measurements of the spin and momentum
+distributions of a strontium degenerate Fermi gas, and thus opens the path to
+momentum-resolved spin correlation measurements on SU(N) quantum magnets.",2003.13444v3
+2020-10-21,Spontaneous Chiral-Spin Ordering in Spin-Orbit Coupled Honeycomb Magnets,"Frustrated magnets with highly degenerate ground states are at the heart of
+hunting exotic states of matter. Recent studies in spin-orbit coupled honeycomb
+magnets have generated immense interest in bond-dependent interactions,
+appreciating a symmetric off-diagonal $\Gamma$ interaction which exhibits a
+macroscopic degeneracy in the classical limit. Here, we study a generic spin
+model and discover a novel chiral-spin ordering with spontaneously broken
+time-reversal symmetry near the dominant $\Gamma$ region. The chiral-spin phase
+is demonstrated to possess a staggered chirality relation in different
+sublattices, and it exhibits gapless excitations as revealed by the vanishing
+energy gap and the finite central charge on cylinders. Although there is a
+vestige of a tiny peak in the corner of the second Brillouin zone, the magnetic
+order is likely to vanish as the system size increases. Finally, we also
+attempt to gain insight into the possible topological signature of the
+chiral-spin phase by calculating the dynamic structure factor and the modular
+$\mathcal{S}$ matrix.",2010.11233v2
+2021-03-10,Spin response and topology of a staggered Rashba superconductor,"Inversion symmetry is a key symmetry in unconventional superconductors and
+even its local breaking can have profound implications. For inversion-symmetric
+systems, there is a competition on a microscopic level between the spin-orbit
+coupling associated with the local lack of inversion and hybridizing terms that
+`restore' inversion. Investigating a layered system with alternating
+mirror-symmetry breaking, we study this competition considering the spin
+response of different superconducting order parameters for the case of strong
+spin-orbit coupling. We find that signatures of the local non-centrosymmetry,
+such as an increased spin susceptibility in spin-singlet superconductors for
+$T\rightarrow 0$, persist even into the quasi-three-dimensional regime. This
+leads to a direction dependent spin response which allows to distinguish
+different superconducting order parameters. Furthermore, we identify several
+regimes with possible topological superconducting phases within a
+symmetry-indicator analysis. Our results may have direct relevance for the
+recently reported Ce-based superconductor CeRh$_2$As$_2$ and beyond.",2103.06282v1
+2021-04-19,Old experiments in new light: Young's double-slit and Stern-Gerlach experiments in liquid crystal microcavities,"Spin-orbit interactions which couple spin of a particle with its momentum
+degrees of freedom lie at the center of spintronic applications. Of special
+interest in semiconductor physics are Rashba and Dresselhaus spin-orbit
+coupling (SOC). When equal in strength, the Rashba and Dresselhaus fields
+result in SU(2) spin rotation symmetry and emergence of the persistent spin
+helix (PSH) only investigated for charge carriers in semiconductor quantum
+wells. Recently, a synthetic Rashba-Dresselhaus Hamiltonian was shown to
+describe cavity photons confined in a microcavity filled with optically
+anisotropic liquid crystal. In this work, we present a purely optical
+realisation of two types of spin patterns corresponding to PSH and the
+Stern-Gerlach experiment in such a cavity. We show how the symmetry of the
+Hamiltonian results in spatial oscillations of the spin orientation of photons
+travelling in the plane of the cavity.",2104.09674v1
+2021-07-11,Electronic and magnetic properties of honeycomb zigzag nanoribbons in the in-plane transverse electric field using Kane-Mele-Hubbard model,"Using the Kane-Mele-Hubbard model in the unrestricted mean field
+approximation, the effect of spin-orbit coupling, as an intrinsic parameter,
+and an in-plane transverse electric field, as an external parameter, on the
+electronic and magnetic properties of honeycomb zigzag nanoribbons are
+investigated in the presence of electron-electron interaction. Our calculations
+show that each of these parameters has significant effects on the physical
+properties of nanoribbons, and each of them independently transitions the
+nanoribbon from a magnetic to non-magnetic state. The process of change in some
+aspect of physical properties, such as symmetry breaking, separation of spin up
+and spin down energy bands, reduction of magnetic order, change of electric
+dipole moment and spin current of nanoribbons, which are due to change of these
+two parameters are investigated. we will see that spin-orbit coupling in the
+competition with the transverse electric field determines the basic physical
+properties of the nanoribbon. This research, can provide a better understanding
+of two types of topological and non-topological transitions. In addition, the
+separation of spin-up and spin-down energy bands and their tuning by these
+parameters can be considered as a candidate for use in spintronic instruments.",2107.05120v1
+2023-12-14,Giant chirality-induced spin polarization in twisted transition metal dichalcogenides,"Chirality-induced spin selectivity (CISS) is an effect that has recently
+attracted a great deal of attention in chiral chemistry and that remains to be
+understood. In the CISS effect, electrons passing through chiral molecules
+acquire a large degree of spin polarization. In this work we study the case of
+atomically-thin chiral crystals created by van der Waals assembly. We show that
+this effect can be spectacularly large in systems containing just two
+monolayers, provided they are spin-orbit coupled. Its origin stems from the
+combined effects of structural chirality and spin-flipping spin-orbit coupling.
+We present detailed calculations for twisted homobilayer transition metal
+dichalcogenides, showing that the chirality-induced spin polarization can be
+giant, e.g. easily exceeding $50\%$ for ${\rm MoTe}_2$. Our results clearly
+indicate that twisted quantum materials can operate as a fully tunable platform
+for the study and control of the CISS effect in condensed matter physics and
+chiral chemistry.",2312.09169v2
+2002-02-04,Electronic theory for the normal state spin dynamics in Sr$_2$RuO$_4$: anisotropy due to spin-orbit coupling,"Using a three-band Hubbard Hamiltonian we calculate within the
+random-phase-approximation the spin susceptibility, $\chi({\bf q},\omega)$, and
+NMR spin-lattice relaxation rate, 1/T$_1$, in the normal state of the triplet
+superconductor Sr$_2$RuO$_4$ and obtain quantitative agreement with
+experimental data. Most importantly, we find that due to spin-orbit coupling
+the out-of-plane component of the spin susceptibility $\chi^{zz}$ becomes at
+low temperatures two times larger than the in-plane one. As a consequence
+strong incommensurate antiferromagnetic fluctuations of the
+quasi-one-dimensional $xz$- and $yz$-bands point into the $z$-direction. Our
+results provide further evidence for the importance of spin fluctuations for
+triplet superconductivity in Sr$_2$RuO$_4$.",0202051v2
+2005-01-04,Anisotropy of spin splitting and spin relaxation in lateral quantum dots,"Inelastic spin relaxation and spin splitting $\epsilon_{\mathrm{s}}$ in
+lateral quantum dots are studied in the regime of strong in-plane magnetic
+field. Due to both g-factor energy dependence and spin-orbit coupling
+$\epsilon_{\mathrm{s}}$ demonstrates a substantial non-linear magnetic field
+dependence similar to that observed by R.Hanson \textit{et al} [Phys. Rev.
+Lett. \textbf{91}, 196802 (2003)]. It also varies with the in-plane orientation
+of magnetic field due to crystalline anisotropy of spin-orbit coupling. Spin
+relaxation rate is also anisotropic, the anisotropy increasing with the field.
+When the magnetic length is less than the 'thickness' of GaAs dot, the
+relaxation can be order of magnitude faster for $\mathbf{B}% \Vert\lbrack100]$
+than for $\mathbf{B\Vert}[110]$.",0501046v1
+2006-04-18,Spin precession in inversion-asymmetric two-dimensional systems,"We present a theoretical method to calculate the expectation value of spin in
+an inversion-asymmetric two-dimensional (2D) system with respect to an
+arbitrarily spin-polarized electron state, injected via an ideal point contact.
+The 2D system is confined in a [001]-grown quantum well, where both the Rashba
+and the Dresselhaus spin-orbit couplings are taken into account. The obtained
+analytical results allow more concrete description of the spatial behaviors of
+the spin precession caused by individually the Rashba and the Dresselhaus
+terms. Applying the calculation on the Datta-Das spin-FET, whose original
+design considers only the Rashba effect inside the channel, we investigate the
+possible influence due to the Dresselhaus spin-orbit coupling. Concluded
+solution is the choice of +-[1+-10], in particular [110], as the channel
+direction.",0604406v1
+2011-09-05,Nucleon resonances in the fourth resonance region,"Nucleon and $\Delta$ resonances in the fourth resonance region are studied in
+a multichannel partial-wave analysis which includes nearly all available data
+on pion- and photo-induced reactions off protons. In the high-mass range, above
+1850\,MeV, several alternative solutions yield a good description of the data.
+For these solutions, masses, widths, pole residues and photo-couplings are
+given. In particular, we find evidence for nucleon resonances with
+spin-parities $J^P=1/2^+...7/2^+$. For one set of solutions, there are four
+resonances forming naturally a spin-quartet of resonances with orbital angular
+momentum L=2 and spin S=3/2 coupling to $J=1/2,...,7/2$. Just below 1.9\,GeV we
+find a spin doublet of resonances with $J^P=1/2^-$ and $3/2^-$. Since a spin
+partner with $J^P=5/2^-$ is missing at this mass, the two resonances form a
+spin doublet which must have a symmetric orbital-angular-momentum wave function
+with L=1. For another set of solutions, the four positive-parity resonances are
+accompanied by mass-degenerate negative-parity partners -- as suggested by the
+conjecture of chiral symmetry restoration. The possibility of a $J^P=1/2^+,
+3/2^+$ spin doublet at 1900\,MeV belonging to a 20-plet is discussed.",1109.0970v1
+2013-06-02,Interband spin-orbit coupling between anti-parallel spin states in Pb quantum well states,"Using spin and angle-resolved photoemission spectroscopy we investigate a
+momentum region in Pb quantum well states on Si(111) where hybridization
+between Rashba-split bands alters the band structure significantly. Starting
+from the Rashba regime where the dispersion of the quasi-free two-dimensional
+electron gas is well described by two spin-polarized parabolas, we find a
+breakdown of the Rashba behavior which manifests itself (i) in a spin splitting
+that is no longer proportional to the in-plane momentum and (ii) in a reversal
+of the sign of the momentum splitting. Our experimental findings are well
+explained by including interband spin-orbit coupling that mixes Rashba-split
+states with anti-parallel rather than parallel spins. Similar results for
+Pb/Cu(111) reveal that the proposed hybridization scenario is independent on
+the supporting substrate.",1306.0245v1
+2013-11-19,Parity-Mixed Superconductivity in Locally Non-centrosymmetric System,"We study the parity-mixed superconductivity in locally non-centrosymmetric
+systems. In multilayer systems an inhomogeneous Rashba spin-orbit coupling is
+induced by the local violation of inversion symmetry. Our previous study
+revealed that a pair-density wave (PDW) phase, with a sign-modulated order
+parameter, is stabilized in the spin-singlet multilayer superconductors owing
+to the spin-orbit coupling. In this letter, we show that the uniform
+spin-triplet superconductivity emerges through parity mixing in the PDW phase,
+taking into account a weak interaction in the spin-triplet channel, which was
+neglected in our previous study. The spin-triplet superconducting phase is
+nonunitary owing to field-induced parity mixing. The critical magnetic field is
+markedly increased by the emergence of spin-triplet superconductivity. We
+calculate the density of states and analyze the signature specific to this
+phase.",1311.4660v1
+2014-10-01,Near-Earth Asteroid Satellite Spins Under Spin-Orbit Coupling,"We develop a fourth-order numerical integrator to simulate the coupled spin
+and orbital motions of two rigid bodies having arbitrary mass distributions
+under the influence of their mutual gravitational potential. We simulate the
+dynamics of components in well-characterized binary and triple near-Earth
+asteroid systems and use surface of section plots to map the possible spin
+configurations of the satellites. For asynchronous satellites, the analysis
+reveals large regions of phase space where the spin state of the satellite is
+chaotic. For synchronous satellites, we show that libration amplitudes can
+reach detectable values even for moderately elongated shapes. The presence of
+chaotic regions in the phase space has important consequences for the evolution
+of binary asteroids. It may substantially increase spin synchronization
+timescales, explain the observed fraction of asynchronous binaries, delay
+BYORP-type evolution, and extend the lifetime of binaries. The variations in
+spin rate due to large librations also affect the analysis and interpretation
+of lightcurve and radar observations.",1410.0082v3
+2016-06-03,Enhanced spin-orbit coupling in core/shell nanowires,"The spin-orbit coupling (SOC) in semiconductors is strongly influenced by
+structural asymmetries, as prominently observed in bulk crystal structures that
+lack inversion symmetry. Here, we study an additional effect on the SOC: the
+asymmetry induced by the large interface area between a nanowire core and its
+surrounding shell. Our experiments on purely wurtzite GaAs/AlGaAs core/shell
+nanowires demonstrate optical spin injection into a single free-standing
+nanowire and determine the effective electron g-factor of the hexagonal GaAs
+wurtzite phase. The spin relaxation is highly anisotropic in time-resolved
+micro-photoluminescence measurements on single nanowires, showing a significant
+increase of spin relaxation in external magnetic fields. This behavior is
+counterintuitive compared to bulk wurtzite crystals. We present a model for the
+observed electron spin dynamics highlighting the dominant role of the
+interface-induced SOC in these core/shell nanowires. This enhanced SOC may
+represent an interesting tuning parameter for the implementation of
+spin-orbitronic concepts in semiconductor-based structures.",1606.01135v1
+2016-06-17,Designing exotic many-body states of atomic spin and motion in photonic crystals,"Cold atoms coupled to photonic crystals constitute an exciting platform for
+exploring quantum many-body physics. Here we investigate the strong coupling
+between atomic internal (""spin"") degrees of freedom and motion, which arises
+from spin-dependent forces associated with the exchange of guided photons. We
+show that this system can realize a remarkable and extreme limit of quantum
+spin-orbital systems, where both the direct spin exchange between neighboring
+sites and the kinetic energy of the orbital motion vanish. We find that this
+previously unexplored system has a rich phase diagram of emergent orders,
+including spatially dimerized spin-entangled pairs, a fluid of composite
+particles comprised of joint spin-phonon excitations, phonon-induced N\'eel
+ordering, and a fractional magnetization plateau associated with trimer
+formation.",1606.05582v1
+2008-07-10,Spin rotations induced by electron running on closed trajectories in gated semiconductor nanodevices,"A design for a quantum gate performing transformations of a single electron
+spin is presented. The spin rotations are performed by the electron going
+around the closed loops in a gated semiconductor device. We demonstrate the
+operation of NOT, phase-flip and Hadamard quantum gates, i.e. the single-qubit
+gates which are most commonly used in the algorithms. The proposed devices
+employ the self-focusing effect for the electron wave packet interacting with
+the electron gas on the electrodes and the Rashba spin-orbit coupling. Due to
+the self-focusing effect the electron moves in a compact wave packet. The
+spin-orbit coupling translates the spatial motion of the electron into the
+rotations of the spin. The device does not require microwave radiation and
+operates using low constant voltages. It is therefore suitable for selective
+single-spin rotations in larger registers.",0807.1627v2
+2012-05-29,"Sum rules, dipole oscillation and spin polarizability of a spin-orbit coupled quantum gas","Using a sum rule approach we investigate the dipole oscillation of a
+spin-orbit coupled Bose-Einstein condensate confined in a harmonic trap. The
+crucial role played by the spin polarizability of the gas is pointed out. We
+show that the lowest dipole frequency exhibits a characteristic jump at the
+transition between the stripe and spin-polarized phase. Near the second order
+transition between the spin-polarized and the single minimum phase the lowest
+frequency is vanishingly small for large condensates, reflecting the divergent
+behavior of the spin polarizability. We compare our results with recent
+experimental measurements as well as with the predictions of effective mass
+approximation.",1205.6398v2
+2017-05-25,Semiclassical Boltzmann theory of spin Hall effects in giant Rashba systems,"For the spin Hall effect arising from strong band-structure spin-orbit
+coupling, a semiclassical Boltzmann theory reasonably addressing the intriguing
+disorder effect called side-jump is still absent. In this paper we describe
+such a theory of which the key ingredient is the spin-current-counterpart of
+the semiclassical side-jump velocity (introduced in the context of the
+anomalous Hall effect). Applying this theory to spin Hall effects in a
+two-dimensional electron gas with giant Rashba spin-orbit coupling, we find
+largely enhanced spin Hall angle in the presence of magnetic impurities when
+only the lower Rashba band is partially occupied.",1705.09399v3
+2021-07-14,Current Induced Hole Spin Polarization in Quantum Dot via Chiral Quasi Bound State,"We put forward a mechanism for current induced spin polarization for a hole
+in a quantum dot side-coupled to a quantum wire, that is based on the
+spin-orbit splitting of the valence band. We predict that in a stark contrast
+with the traditional mechanisms based on the linear in momentum spin-orbit
+coupling, an exponentially small bias applied to the quantum wire with heavy
+holes is enough to create the 100% spin polarization of a localized light hole.
+Microscopically, the effect is related with the formation of chiral quasi bound
+states and the spin dependent tunneling of holes from the quantum wire to the
+quantum dot. This novel current induced spin polarization mechanism is equally
+relevant for the GaAs, Si and Ge based semiconductor nanostructures.",2107.06741v1
+2022-01-25,Spin splitting in low-symmetry quantum wells beyond Rashba and Dresselhaus terms,"Spin-orbit interaction in semiconductor structures with broken space
+inversion symmetry leads to spin splitting of electron and hole states even in
+the absence of magnetic field. We discover that, beyond the Rashba and
+Dresselhaus contributions, there is an additional type of the zero-field spin
+splitting which is caused by the interplay of the cubic shape of crystal unit
+cell and macroscopic structure asymmetry. In quantum wells grown along
+low-symmetry crystallographic axes, this type of spin-orbit interaction couples
+the out-of-plane component of carrier's spin with the in-plane momentum while
+the coupling strength is controlled by structure inversion asymmetry. We carry
+out numerical calculations and develop an analytical theory, which demonstrate
+that this interaction can dominate $\boldsymbol{k}$-linear spin splitting of
+heavy-hole subbands.",2201.10388v1
+2023-09-02,Chirality-dependent persistent spin current in single circular helix molecules,"Since the chiral-induced spin selectivity (CISS) was first observed
+experimentally, its microscopic mechanism has been continuously explored by the
+scientific community. Among these investigations, the non-equilibrium effects
+and the unknown origins of spin-orbit coupling (SOC) have been the central
+issues discussed in recent years. Here, we have achieved a persistent spin
+current in different circular single-helix molecule driven by a magnetic field,
+which is inherently linked to the equilibrium state associated with chirality.
+Due to its measurement method being different from the transport currents
+observed in previous experiments, the origin of its spin-orbit coupling can be
+explored by modifying the substrate with different light and heavy metal
+elements. Our results demonstrate that a persistent spin current can be
+observed regardless of whether the SOC originates from the chiral molecule or
+the substrate. Furthermore, by tuning the direction of the magnetic field, we
+can achieve a phase transition between trivial and non-trivial chiral
+persistent spin currents. Our work provides a new perspective and platform for
+exploring the nature of CISS and controlling the effects of CISS.",2309.00812v2
+2022-09-06,Enhancement of spin-orbit torque efficiency by tailoring interfacial spin-orbit coupling in Pt-based magnetic multilayers,"We study inserting Co layer thickness-dependent spin transport and spin-orbit
+torques (SOTs) in the Pt/Co/Py trilayers by spin-torque ferromagnetic
+resonance. The interfacial perpendicular magnetic anisotropy energy density
+($K_s = 2.7~erg/cm^2$), which is dominated by interfacial spin-orbit coupling
+(ISOC) in the Pt/Co interface, total effective spin-mixing conductance
+($G_{eff,tot} = 0.42 {\times} 10^{15}~{\Omega}^{-1} m^{-2}$) and two-magnon
+scattering (${\beta}_{TMS} = 0.46~nm^2$) are first characterized, and the
+damping-like torque (${\xi}_{DL}$ = 0.103) and field-like torque (${\xi}_{FL}$
+= -0.017) efficiencies are also calculated quantitatively by varying the
+thickness of the inserting Co layer. The significant enhancement of
+${\xi}_{DL}$ and ${\xi}_{FL}$ in Pt/Co/Py than Pt/Py bilayer system originates
+from the interfacial Rashba-Edelstein effect due to the strong ISOC between
+Co-3d and Pt-5d orbitals at the Pt/Co interface. Additionally, we find a
+considerable out-of-plane spin polarization SOT, which is ascribed to the spin
+anomalous Hall effect and possible spin precession effect due to IPMA-induced
+perpendicular magnetization at the Pt/Co interface. Our results demonstrate
+that the ISOC of the Pt/Co interface plays a vital role in spin transport and
+SOTs-generation. Our finds offer an alternative approach to improve the
+conventional SOTs efficiencies and generate unconventional SOTs with
+out-of-plane spin polarization to develop low power Pt-based spintronic via
+tailoring the Pt/FM interface.",2209.02282v1
+2013-05-24,Effective-one-body Hamiltonian with next-to-leading order spin-spin coupling for two nonprecessing black holes with aligned spins,"The canonical Arnowitt-Deser-Misner (ADM) Hamiltonian with next-to-leading
+order spin-spin coupling [J. Steinhoff, S. Hergt, and G. Sch\""afer] is
+converted into the EOB formalism of T. Damour, P. Jaranowski, and G. Sch\""afer
+for the special case of spinning black hole binaries whose spins are aligned
+with the angular momentum. In particular, we propose to include the new terms
+by adding a dynamical term of next-to-leading order to the Kerr parameter
+squared entering the effective metric. The modified EOB Hamiltonian
+consistently reduces to the Kerr Hamiltonian as the mass ratio tends to zero;
+moreover, it predicts the existence of an Innermost Stable Circular Orbit. We
+also derive, for the general case of arbitrarily oriented spins but in the
+vanishing mass-ratio limit, a coordinate transformation that maps the
+next-to-leading order spin-spin contribution of the ADM Hamiltonian to the EOB
+Hamiltonian.",1305.5674v3
+2016-01-07,Majorana bound states in a disordered quantum dot chain,"We study Majorana bound states in a disordered chain of semiconductor quantum
+dots proximity-coupled to an s-wave superconductor. By calculating its
+topological quantum number, based on the scattering-matrix method and a
+tight-binding model, we can identify the topological property of such an
+inhomogeneous one-dimensional system. We study the robustness of Majorana bound
+states against disorder in both the spin-independent terms (including the
+chemical potential and the regular spin-conserving hopping) and the
+spin-dependent term, i.e., the spin-flip hopping due to the Rashba spin-orbit
+coupling. We find that the Majorana bound states are not completely immune to
+the spin-independent disorder, especially when the latter is strong. Meanwhile,
+the Majorana bound states are relatively robust against spin-dependent
+disorder, as long as the spin-flip hopping is of uniform sign (i.e., the
+varying spin-flip hopping term does not change its sign along the chain).
+Nevertheless, when the disorder induces sign-flip in spin-flip hopping, the
+topological-nontopological phase transition takes place in the
+low-chemical-potential region.",1601.01402v2
+2023-02-06,Inverse Ising effect and Ising magnetoresistance,"Ising (Zeeman-type) spin-orbit coupling (SOC) generated by in-plane inverse
+asymmetry has attracted considerable attention, especially in Ising
+superconductors and spin-valley coupling physics. However, many unconventional
+observations and emerging physical phenomena remain to be elucidated. Here, we
+theoretically study the spin texture of {\sigma}_z (spin angular momentum
+projection along z) induced by Ising SOC in 1Td WTe2, and propose an
+unconventional spin-to-charge conversion named inverse Ising effect, in which
+the directions of the spin current, spin polarization and charge current are
+not orthogonal. In particular, we predict the Ising magnetoresistance, whose
+resistance depends on the out-of-plane magnetic momentum in WTe2/ferromagnetic
+heterostructure. The Ising magnetoresistance is believed to be an interesting
+counterpart to the well studied spin Hall magnetoresistance. Our predictions
+provide promising way to spin-momentum locking and spin-charge conversion based
+on emerging Ising SOC.",2302.02745v1
+2023-11-02,Controllable single spin evolution at sub-harmonics of electric dipole spin resonance enhanced by four-level Landau-Zener-St{ü}ckelberg-Majorana interference,"Sub-harmonics of electric dipole spin resonance (EDSR) mediated by
+Landau-Zener-St{\""u}ckelberg-Majorana (LZSM) tunneling transitions are studied
+numerically and analytically in a Zeeman-split four level system with strong
+spin-orbit coupling that can be realized, for example, in a GaAs-based double
+quantum dot in a single-hole regime. The spin qubit is formed in one of the
+dots and the second dot is used as an auxiliary element to enhance
+functionality of the spin qubit. In particular, it is found that the spin
+rotation rate can be essentially enhanced due to the tunnel coupling with the
+auxiliary dot on both the main EDSR frequency and at its high sub-harmonics
+allowing the coherent spin $\pi$-rotations on a 10-ns time scale. Spin
+manipulation on high sub-harmonics is promising for new time-efficient schemes
+of the spin control and readout in qubit devices operating at high magnetic
+fields where the main harmonic is inaccessible due to hardware limitations.",2311.01607v1
+2003-10-05,Dynamical Symmetry Enlargement Versus Spin-Charge Decoupling in the One-Dimensional SU(4) Hubbard Model,"We investigate dynamical symmetry enlargement in the half-filled SU(4)
+Hubbard chain using non-perturbative renormalization group and Quantum Monte
+Carlo techniques. A spectral gap is shown to open for arbitrary Coulombic
+repulsion $U$. At weak coupling, $U \lesssim 3t$, a SO(8) symmetry between
+charge and spin-orbital excitations is found to be dynamically enlarged at low
+energy. At strong coupling, $U \gtrsim 6t$, the charge degrees of freedom
+dynamically decouple and the resulting effective theory in the spin-orbital
+sector is that of the SO(6) antiferromagnetic Heisenberg model. Both regimes
+exhibit spin-Peierls order. However, although spin-orbital excitations are
+$incoherent$ in the SO(6) regime they are $coherent$ in the SO(8) one. The
+cross-over between these regimes is discussed.",0310090v1
+2004-07-22,Strongly correlated crystal-field approach to Mott insulator LaCoO3,"Our success in description of recent electron-spin-resonance results on Mott
+insulator LaCoO3, Phys. Rev. B 67 (2003) 172401, lies in taking into account
+strong electron correlations among d electrons and the relativistic spin-orbit
+coupling. In the developed by us Quantum Atomistic Solid State Theory (QUASST)
+we assume that the atomic-like integrity of the 3d^6 system is preserved in the
+Co^3+ ion in LaCoO3 and that intra-atomic correlations are much stronger than
+crystal field interactions. We conclude that in LaCoO3 there is no intermediate
+spin state as came out from band-structure calculations. The excited states
+originate from the high-spin 5T2g term, being 12 meV above the ground 1A1
+state. We are convinced that many-electron CEF approach with strong
+correlations and the atomic-scale orbital magnetism is physically adequate
+approach to 3d oxides.
+  Keywords: Mott insulator, crystal field, spin-orbit coupling, LaCoO3",0407580v2
+2006-08-31,Coulomb Drag and Spin Coulomb Drag in the presence of Spin-orbit Coupling,"Employing diagrammatic perturbation theory, we calculate the (charge) Coulomb
+drag resistivity $\rho_D$ and spin Coulomb drag resistivity
+$\rho_{\uparrow\downarrow}$ in the presence of Rashba spin-orbit coupling.
+Analytical expressions for $\rho_D$ and $\rho_{\uparrow\downarrow}$ are
+derived, and it is found that spin-orbit interaction produces a small
+enhancement to $\rho_D$ and $\rho_{\uparrow\downarrow}$ in the ballistic regime
+while $\rho_D$ is unchanged in the diffusive regime. This enhancement in the
+ballistic regime is attributed to the enhancement of the nonlinear
+susceptibility (i.e. current produced through the rectification of the thermal
+electric potential fluctuations in the passive layer) while the lack of
+enhancement in the diffusive regime is due to the suppression by disorder.",0608728v1
+2006-11-03,Anisotropic spin relaxation in quantum dots,"We study theoretically phonon-assisted spin relaxation of an electron
+confined in an elliptical quantum dot (QD) subjected to a tilted magnetic
+field. In the presence of both Rashba and Dresselhaus spin-orbit terms, the
+relaxation rate is anisotropic with respect to the in-plane field orientation.
+This anisotropy originates from the interference, at nonzero tilt angle,
+between the two spin-orbit terms. We show that, in a narrow range of magnetic
+field orientations, the relaxation rate exhibits anomalous sensitivity to
+variations of the QD parameters. In this range, the relative change in the
+relaxation rate with in-plane field orientation is determined {\em solely} by
+the spin-orbit coupling strengths and by the dot geometry. This allows
+simultaneous determination of both Rashba and Dresselhaus coupling parameters
+and the dot ellipticity from analysis of the angular dependence of the
+relaxation rate.",0611065v2
+2007-04-23,Spin dephasing due to a random Berry phase,"We investigate relaxation and dephasing of an electron spin confined in a
+semiconductor quantum dot and subject to spin-orbit coupling. Even in vanishing
+magnetic field, B = 0, slow noise coupling to the electron's orbital degree of
+freedom leads to dephasing of the spin due to a random, in general non-Abelian
+Berry phase acquired by the spin. For illustration we first present a simple
+quasiclassical description, then consider a model with 2 orbital states only,
+and finally present a perturbative quantum treatment appropriate for an
+electron in a realistic (roughly parabolic, not too strongly confining) quantum
+dot. We further compare the effect of different sources of noise. While at
+large magnetic fields phonons dominate the relaxation processes, at low fields
+electron-hole excitations and possibly 1/f noise may dominate.",0704.2974v1
+2008-03-21,Intrinsic electric polarization in spin-orbit coupled semiconductor heterostructures,"We present Maxwell equations with source terms for the electromagnetic field
+interacting with a moving electron in a spin-orbit coupled semiconductor
+heterostructure. We start with the eight--band ${\bm k}{\bm p}$ model and
+derive the electric and magnetic polarization vectors using the Gordon--like
+decomposition method. Next, we present the ${\bm k}{\bm p}$ effective
+Lagrangian for the nonparabolic conduction band electrons interacting with
+electromagnetic field in semiconductor heterostructures with abrupt interfaces.
+This Lagrangian gives rise to the Maxwell equations with source terms and
+boundary conditions at heterointerfaces as well as equations for the electron
+envelope wave function in the external electromagnetic field together with
+appropriate boundary conditions. As an example, we consider spin--orbit effects
+caused by the structure inversion asymmetry for the conduction electron states.
+We compute the intrinsic contribution to the electric polarization of the
+steady state electron gas in asymmetric quantum well in equilibrium and in the
+spin Hall regime. We argue that this contribution, as well as the intrinsic
+spin Hall current, are not cancelled by the elastic scattering processes.",0803.3193v1
+2009-02-08,Magnetization in two-dimensional electron gas in a perpendicular magnetic field: the roles of edge states and spin-orbit coupling,"We study the de Haas--van Alphen (dHvA) oscillations in the magnetization of
+a two-dimensional electron gas (2DEG) under the influence of the edge states
+and/or the Rashba spin-orbit interaction (SOI). The boundaries of the systems
+lift partially the degeneracies of Landau levels (LL's) and the resulting edge
+states lead to the changes of both the center and the amplitude of the
+sawtoothlike magnetization oscillation. The SOI mixes the spin-up and spin-down
+states of neighboring LL's into two unequally spaced energy branches. The
+inclusion of SOI changes the well-defined sawtooth pattern of the dHvA
+oscillations in the magnetization. The weaker the magnetic field is, the larger
+is the change of the dHvA oscillations due to the edge effect and/or the
+spin-orbit coupling. Some theoretical results are compared with the
+experimental data.",0902.1298v1
+2010-09-28,Role of linear and cubic terms for the drift-induced Dresselhaus spin-orbit splitting in a two-dimensional electron gas,"The Dresselhaus spin-orbit interaction (SOI) of a series of two-dimensional
+electron gases (2DEGs) hosted in GaAs/AlGaAs and InGaAs/GaAs (001) quantum
+wells (QWs) is measured by monitoring the precession frequency of the spins as
+a function of an in-plane electric field. The measured spin-orbit-induced
+spin-splitting is linear in the drift velocity, even in the regime where the
+cubic Dresselhaus SOI is important. We relate the measured splitting to the
+Dresselhaus coupling parameter, the QW confinement, the Fermi wavenumber and to
+strain effects. From this, the coupling parameter is determined quantitatively,
+including its sign.",1009.5596v2
+2013-12-27,Exact Nonadiabatic Holonomic Transformations of Spin-Orbit Qubits,"An exact analytical solution is derived for the wavefunction of an electron
+in a one-dimensional moving quantum dot in a nanowire, in the presence of
+time-dependent spin-orbit coupling. For cyclic evolutions we show that the spin
+of the electron is rotated by an angle proportional to the area of a closed
+loop in the parameter space of the time-dependent quantum dot position and the
+amplitude of a fictitious classical oscillator driven by the time-dependent
+spin-orbit coupling. By appropriate choice of parameters, we show that
+arbitrary spin rotations may be performed on the Bloch sphere. Exact
+expressions for dynamical and geometrical phases are also derived.",1312.7254v3
+2014-01-05,Magnon-Mediated Dzyaloshinskii-Moriya Torque in Homogeneous Ferromagnets,"In thin magnetic layers with structural inversion asymmetry and spin-orbit
+coupling, a Dzyaloshinskii-Moriya interaction arises at the interface. When a
+spin wave current ${\bf j}_m$ flows in a system with a homogeneous
+magnetization {\bf m}, this interaction produces an effective field-like torque
+on the form ${\bf T}_{\rm FL}\propto{\bf m}\times({\bf z}\times{\bf j}_m)$ as
+well as a damping-like torque, ${\bf T}_{\rm DL}\propto{\bf m}\times[({\bf
+z}\times{\bf j}_m)\times{\bf m}]$ in the presence of spin-wave relaxation
+(${\bf z}$ is normal to the interface). These torques mediated by the magnon
+flow can reorient the time-averaged magnetization direction and display a
+number of similarities with the torques arising from the electron flow in a
+magnetic two dimensional electron gas with Rashba spin-orbit coupling. This
+magnon-mediated spin-orbit torque can be efficient in the case of magnons
+driven by a thermal gradient.",1401.0883v2
+2015-05-15,Rashba Spin-Orbit Coupling Enhanced Carrier Lifetime in Organometal Halide Perovskites,"Organometal halide perovskites are promising solar-cell materials for
+next-generation photovoltaic applications. The long carrier lifetime and
+diffusion length of these materials make them very attractive for use in light
+absorbers and carrier transporters. While these aspects of organometal halide
+perovskites have attracted the most attention, the consequences of the Rashba
+effect, driven by strong spin-orbit coupling, on the photovoltaic properties of
+these materials are largely unexplored. In this work, taking the electronic
+structure of methylammonium lead iodide as an example, we propose an intrinsic
+mechanism for enhanced carrier lifetime in 3D Rashba materials. Based on
+first-principles calculations and a Rashba spin-orbit model, we demonstrate
+that the recombination rate is reduced due to the spin-forbidden transition.
+These results are important for understanding the fundamental physics of
+organometal halide perovskites and for optimizing and designing the materials
+with better performance. The proposed mechanism including spin degrees of
+freedom offers a new paradigm of using 3D Rashba materials for photovoltaic
+applications.",1505.04212v1
+2015-12-02,Enhanced spin-orbit coupling in dilute fluorinated graphene,"The preservation and manipulation of a spin state mainly depends on the
+strength of the spin-orbit interaction. For pristine graphene, the intrinsic
+spin-orbit coupling (SOC) is only in the order of few ueV, which makes it
+almost impossible to be used as an active element in future electric field
+controlled spintronics devices. This stimulates the development of a systematic
+method for extrinsically enhancing the SOC of graphene. In this letter, we
+study the strength of SOC in weakly fluorinated graphene devices. We observe
+high non-local signals even without applying any external magnetic field. The
+magnitude of the signal increases with increasing fluorine adatom coverage.
+From the length dependence of the non-local transport measurements, we obtain
+SOC values of ~ 5.1 meV and ~ 9.1 meV for the devices with ~ 0.005% and ~ 0.06%
+fluorination, respectively. Such a large enhancement, together with the high
+charge mobility of fluorinated samples (u~4300 cm2/Vs - 2700 cm2/Vs), enables
+the detection of the spin Hall effect even at room temperature.",1512.00642v1
+2018-10-24,A systematic study of the local minima in L(S)DA+U,"We have performed a systematic study of the emergence of meta-stable states
+in density functional theory plus Hubbard U (DFT+U ) simulations of NiO, CoO,
+FeO. Particular attention is given to the spin-polarization of the
+exchange-correlation functional and the double counting term, and the role of
+the spin-orbit coupling. The method of occupation matrix control is extended to
+use constrained random density matrices to map out the local minima in the
+total energy landscape. The extended scheme, random density matrix control, is
+successfully benchmarked against UO2, one of the most investigated systems in
+the field. When applied to the transition metal oxides it yields several meta-
+stable states which are well-characterized by their local spin and orbital
+moments. We find that the addition of spin-orbit coupling helps the simulations
+to converge to the global high-spin energy minimum. The random density matrix
+control scheme combined with LDA+U yields accurate magnetic moments for all the
+studied AFM transition metal oxides.",1810.10393v1
+2019-10-02,Valley- and spin-dependent quantum Hall states in bilayer silicene,"The Hall conductivity $\sigma_{xy}$ of many condensed matter systems presents
+a step structure when a uniform perpendicular magnetic field is applied. We
+report the quantum Hall effect in buckled AB-bottom-top bilayer silicene and
+its robust dependence on the electronic valley and spin-orbit coupling. With
+the unique multi-valley electronic structure and the lack of spin degeneracy,
+the quantization of the Hall conductivity in this system is unlike the
+conventional sequence as reported for graphene. Furthermore, the conductivity
+plateaux take different step values for conduction ($2e^2/h$) and valence
+($6e^2/h$) bands since their originating valleys present inequivalent
+degeneracy. We also report the emergence of fractions under significant effect
+of a uniform external electric field on the quantum Hall step structure by the
+separation of orbital distributions and the mixing of Landau levels from
+distinct valleys. The valley- and spin-dependent quantum Hall conductivity
+arises from the interplay of lattice geometry, atomic interaction, spin-orbit
+coupling, and external magnetic and electric fields.",1910.00786v1
+2019-10-24,Microscopic model for the hidden Rashba effect in YBa$_2$Cu$_3$O$_{6+x}$,"Each unit cell in YBa$_2$Cu$_3$O$_{6+x}$ contains a pair of two-dimensional
+CuO$_2$ layers. While the crystal structure is globally inversion symmetric,
+the individual layers are not. This leads, necessarily, to a nonvanishing
+Rashba spin-orbit coupling (SOC) in the CuO$_2$ layers, with opposite signs of
+the coupling constant in each layer. These so-called Rashba bilayers generate
+hidden spin textures, with a vansishing net spin at each $k$-point in the
+Brillouin zone, but nonvanishing spin textures in each layer separately. Here,
+we trace the microscopic origin of the Rashba splitting through the orbital
+structure of the CuO$_2$ conduction bands, obtain a generic three-orbital model
+Hamiltonian, and show that the magnitude of the spin-splitting predicted by
+density functional theory is $\sim 10$~meV.",1910.11444v1
+2020-01-02,Origin of Strong Two-Magnon Scattering in Heavy Metal/Ferromagnet/Oxide Heterostructures,"We experimentally investigate the origin of the two-magnon scattering (TMS)
+in heavy-metal (HM)/ferromagnet (FM)/oxide heterostructures (FM = Co, Ni81Fe19,
+or Fe60Co20B20) by varying the materials located above and below the FM layers.
+We show that strong TMS in HM/FM/oxide systems arises primarily at the HM/FM
+interface and increases with the strength of interfacial spin-orbit coupling
+and magnetic roughness at this interface. TMS at the FM/oxide interface is
+relatively weak, even in systems where spin-orbit coupling at this interface
+generates strong interfacial magnetic anisotropy. We also suggest that the
+spin-current-induced excitation of non-uniform short-wavelength magnon at the
+HM/FM interface may function as a mechanism of spin memory loss for the
+spin-orbit torque exerted on the uniform mode.",2001.00300v1
+2019-01-30,Van Hove scenario of anisotropic transport in a two-dimensional spin-orbit coupled electron gas in an in-plane magnetic field,"We study electronic transport in two-dimensional spin-orbit coupled electron
+gas subjected to an in-plane magnetic field. The interplay of the spin-orbit
+interaction and the magnetic field leads to the Van Hove singularity of the
+density of states and strong anisotropy of Fermi contours. We develop a method
+that allows one to exactly calculate the nonequilibrium distribution function
+for these conditions within the framework of the semiclassical Boltzmann
+equation without using the scattering time approximation. The method is applied
+to calculate the conductivity tensor and the tensor of spin polarization
+induced by the electric field (Aronov-Lyanda-Geller-Edelstein effect). It is
+found that both the conductivity and the spin polarization have a sharp
+singularity as functions of the Fermi level or magnetic field, which occurs
+when the Fermi level passes through the Van Hove singularity. In addition, the
+transport anisotropy dramatically changes near the singularity.",1901.10823v1
+2020-06-07,Sublattice symmetry breaking and ultra low energy excitations in Graphene-on-hBN Heterostructures,"The low-lying states of graphene contain exciting topological properties that
+depend on the interplay of different symmetry breaking terms. The corresponding
+energy gaps remained unexplored until recently, owing to the low energy scale
+of the terms involved (few tens of ueV). These low energy terms include
+sublattice splitting, the Rashba and the intrinsic spin-orbit coupling, whose
+balance determines the topological properties. In this work, we unravel the
+contributions arising from the sublattice and the intrinsic spin orbit
+splitting in graphene on hexagonal boron-nitride. Employing
+resistively-detected electron spin resonance, we measure a sublattice splitting
+of the order of 20E-6 eV, and confirm an intrinsic spin orbit coupling of
+approximately 45E-6 eV. The dominance of the latter suggests a topologically
+non-trivial state, involving fascinating properties. Electron spin resonance is
+a promising route towards unveiling the intriguing band structure at low energy
+scales.",2006.04190v1
+2021-10-26,Ultra-Strong Spin-Orbit Coupling and Topological Moiré Engineering in Twisted ZrS2 Bilayers,"We predict that twisted bilayers of 1T-ZrS$_2$ realize a novel and tunable
+platform to engineer two-dimensional topological quantum phases dominated by
+strong spin-orbit interactions. At small twist angles, ZrS$_2$ heterostructures
+give rise to an emergent and twist-controlled moir\'e Kagom\'e lattice,
+combining geometric frustration and strong spin-orbit coupling to give rise to
+a moir\'e quantum spin Hall insulator with highly controllable and
+nearly-dispersionless bands. We devise a generic pseudo-spin theory for
+group-IV transition metal dichalcogenides that relies on the two-component
+character of the valence band maximum of the 1T structure at $\Gamma$, and
+study the emergence of a robust quantum anomalous Hall phase as well as
+possible fractional Chern insulating states from strong Coulomb repulsion at
+fractional fillings of the topological moir\'e Kagom\'e bands. Our results
+establish group-IV transition metal dichalcogenide bilayers as a novel moir\'e
+platform to realize strongly-correlated topological phases in a twist-tunable
+setting.",2110.13370v1
+2022-10-24,Effects of spin-orbit coupling and in-plane Zeeman fields on the critical current in two-dimensional hole gas SNS junctions,"Superconductor--semiconductor hybrid devices are currently attracting much
+attention, fueled by the fact that strong spin--orbit interaction in
+combination with induced superconductivity can lead to exotic physics with
+potential applications in fault-tolerant quantum computation. The detailed
+nature of the spin dynamics in such systems is, however, often strongly
+dependent on device details and hard to access in experiment. In this paper we
+theoretically investigate a superconductor--normal--superconductor junction
+based on a two-dimensional hole gas with additional Rashba spin
+orbit--coupling, and we focus on the dependence of the critical current on the
+direction and magnitude of an applied in-plane magnetic field. We present a
+simple model, which allows us to systematically investigate different parameter
+regimes and obtain both numerical results and analytical expressions for all
+limiting cases. Our results could serve as a tool for extracting more
+information about the detailed spin physics in a two-dimensional hole gas based
+on a measured pattern of critical currents.",2210.13266v2
+2001-05-09,Phase Diagram of the Spin-Orbital model on the Square Lattice,"We study the phase diagram of the spin-orbital model in both the weak and
+strong limits of the quartic spin-orbital exchange interaction. This allows us
+to study quantum phase transitions in the model and to approach from both sides
+the most interesting intermediate-coupling regime and in particular the
+SU(4)-symmetric point of the Hamiltonian. It was suggested earlier by Li et al
+[Phys.Rev.Lett. vol. 81, 3527 (1999)] that at this point the ground state of
+the system is a plaquette spin-orbital liquid. We argue that the state is more
+complex. There is plaquette order, but it is anisotropic: bonds in one
+direction are stronger than those in the perpendicular direction. This order is
+somewhat similar to that found recently in the frustrated J_1-J_2 Heisenberg
+spin model.",0105178v1
+2001-07-25,Ruling Out Chaos in Compact Binary Systems,"We investigate the orbits of compact binary systems during the final inspiral
+period before coalescence by integrating numerically the second-order
+post-Newtonian equations of motion. We include spin-orbit and spin-spin
+coupling terms, which, according to a recent study by Levin [J. Levin, Phys.
+Rev. Lett. 84, 3515 (2000)], may cause the orbits to become chaotic. To examine
+this claim, we study the divergence of initially nearby phase-space
+trajectories and attempt to measure the Lyapunov exponent gamma. Even for
+systems with maximally spinning objects and large spin-orbit misalignment
+angles, we find no chaotic behavior. For all the systems we consider, we can
+place a strict lower limit on the divergence time t_L=1/gamma that is many
+times greater than the typical inspiral time, suggesting that chaos should not
+adversely affect the detection of inspiral events by upcoming
+gravitational-wave detectors.",0107082v1
+2009-05-28,Large-J approach to strongly coupled spin-orbital systems,"We present a novel approach to study the ground state and elementary
+excitations in compounds where spins and orbitals are entangled by on-site
+relativistic spin-orbit interaction. The appropriate degrees of freedom are
+localized states with an effective angular momentum J. We generalize J to
+arbitrary large values while maintaining the delicate spin-orbital
+entanglement. After projecting the inter-site exchange interaction to the
+manifold of effective spins, a systematic 1/J expansion of the effective
+Hamiltonian is realized using the Holstein-Primakoff transformation.
+Applications to representative compounds Sr2IrO4 and particularly vanadium
+spinels AV2O4 are discussed.",0905.4728v3
+2016-05-04,Giant spin-orbit splitting in inverted InAs/GaSb double quantum wells,"Transport measurements in inverted InAs/GaSb quantum wells reveal a giant
+spin-orbit splitting of the energy bands close to the hybridization gap. The
+splitting results from the interplay of electron-hole mixing and spin-orbit
+coupling, and can exceed the hybridization gap. We experimentally investigate
+the band splitting as a function of top gate voltage for both electron-like and
+hole-like states. Unlike conventional, noninverted two-dimensional electron
+gases, the Fermi energy in InAs/GaSb can cross a single spin-resolved band,
+resulting in full spin-orbit polarization. In the fully polarized regime we
+observe exotic transport phenomena such as quantum Hall plateaus evolving in
+$e^2/h$ steps and a non-trivial Berry phase.",1605.01241v2
+2019-07-01,Spin Diffusion Equations for Magnetized or Orbital Polarized Systems,"Charge and spin transport in spintronics devices can be described by a spin
+diffusion equation suitable for modelling scales much larger than the
+scattering and atomic scales. This work concerns the coarse graining procedure
+used to compute the coefficients of the diffusion equation, which are sensitive
+the details of individual atoms and impurities. We show with two simple
+examples that in spintronics devices which have both a spin-orbit interaction
+and magnetization, standard coarse graining can easily obtain diffusion
+equations which fail to conserve electronic charge. The same failure can occur
+in systems with both a spin-orbit interaction and orbital polarization. We show
+that linear response theory, coupled with the self-consistent Born
+approximation and ladder diagrams, offers an improved way of calculating
+diffusion equations. We show that the resulting equations satisfy a
+Ward-Takahashi identity that guarantees charge conservation.",1907.00948v1
+2019-11-08,Giant anisotropy of Gilbert damping in a Rashba honeycomb antiferromagnet,"Giant Gilbert damping anisotropy is identified as a signature of strong
+Rashba spin-orbit coupling in a two-dimensional antiferromagnet on a honeycomb
+lattice. The phenomenon originates in spin-orbit induced splitting of
+conduction electron subbands that strongly suppresses certain spin-flip
+processes. As a result, the spin-orbit interaction is shown to support an
+undamped non-equilibrium dynamical mode that corresponds to an ultrafast
+in-plane N\'eel vector precession and a constant perpendicular-to-the-plane
+magnetization. The phenomenon is illustrated on the basis of a two dimensional
+$s$-$d$ like model. Spin-orbit torques and conductivity are also computed
+microscopically for this model. Unlike Gilbert damping these quantities are
+shown to reveal only a weak anisotropy that is limited to the semiconductor
+regime corresponding to the Fermi energy staying in a close vicinity of
+antiferromagnetic gap.",1911.03408v1
+2020-06-16,Spin texture driven spintronic enhancement at the LaAlO$_3$/SrTiO$_3$ interface,"Recent experiments have shown that transition metal oxide heterostructures
+such as SrTiO$_3$-based interfaces, exhibit large, gate tunable, spintronic
+responses. Our theoretical study showcases key factors controlling the
+magnitude of the conversion, measured by the inverse Edelstein and Spin Hall
+effects, and their evolution with respect to an electrostatic doping. The
+origin of the response can be linked to spin-orbital textures. These stem from
+the broken inversion symmetry at the interface which produces an unusual form
+of the interfacial spin-orbit coupling, provided a bulk atomic spin-orbit
+contribution is present. The amplitudes and variations of these observables are
+direct consequences of the multi-orbital subband structure of these materials,
+featuring avoided and topological crossings. Interband contributions to the
+coefficients lead to enhanced responses and non-monotonic evolution with
+doping. We highlight these effects using analytical approaches and low energy
+modeling.",2006.09037v1
+2021-04-23,"Radiation-reaction force and multipolar waveforms for eccentric, spin-aligned binaries in the effective-one-body formalism","While most binary inspirals are expected to have circularized before they
+enter the LIGO/Virgo frequency band, a small fraction of those binaries could
+have non-negligible orbital eccentricity depending on their formation channel.
+Hence, it is important to accurately model eccentricity effects in waveform
+models used to detect those binaries, infer their properties, and shed light on
+their astrophysical environment. We develop a multipolar effective-one-body
+(EOB) eccentric waveform model for compact binaries whose components have spins
+aligned or anti-aligned with the orbital angular momentum. The waveform model
+contains eccentricity effects in the radiation-reaction force and gravitational
+modes through second post-Newtonian (PN) order, including tail effects, and
+spin-orbit and spin-spin couplings. We recast the PN-expanded, eccentric
+radiation-reaction force and modes in factorized form so that the newly derived
+terms can be directly included in the state-of-the-art, quasi-circular--orbit
+EOB model currently used in LIGO/Virgo analyses (i.e., the SEOBNRv4HM model).",2104.11705v2
+2021-12-28,Spin-orbit coupling for close-in planets,"We study the spin evolution of close-in planets in multi-body systems and
+present a very general formulation of the spin-orbit problem. This includes a
+simple way to probe the spin dynamics from the orbital perturbations, a new
+method for computing forced librations and tidal deformation, and general
+expressions for the tidal torque and capture probabilities in resonance. We
+show that planet-planet perturbations can drive the spin of Earth-size planets
+into asynchronous or chaotic states, even for nearly circular orbits. We apply
+our results to Mercury and to the KOI-1599 system of two super-Earths in a 3/2
+mean motion resonance.",2112.14335v1
+2023-03-01,Rashba spin-orbit coupling in infinite-layer nickelate films on SrTiO3(001) and KTaO3(001),"The impact of spin-orbit interactions in NdNiO2/SrTiO3(001) and
+NdNiO2/KTaO3(001) is explored by performing density functional theory
+simulations including a Coulomb repulsion term. Polarity mismatch drives the
+emergence of an interfacial two-dimensional electron gas in NdNiO2/KTaO3(001)
+involving the occupation of Ta $5d$ conduction-band states, which is twice as
+pronounced as in NdNiO2/SrTiO3(001). We identify a significant anisotropic
+$k^3$ Rashba spin splitting of the respective $d_{xy}$ states in both systems
+that results from the broken inversion symmetry at the nickelate-substrate
+interface and exceeds the width of the superconducting gap. In
+NdNiO2/KTaO3(001), the splitting reaches 210 meV, which is comparable to
+Bi(111) surface states. At the surface, the Ni $3d_{x^2-y^2}$-derived states
+exhibit a linear Rashba effect with $\alpha_\text{R} \sim$ 125 meV \r{A},
+exemplifying its orbital selectivity. The corresponding Fermi sheets present a
+reconstructed circular shape due to the electrostatic doping, but undergo a
+Lifshitz transition towards a cuprate-like topology deeper in the film that
+coincides with a realignment of their spin texture. These results promote
+surface and interface polarity as interesting design parameters to control
+spin-orbit physics in infinite-layer nickelate heterostructures.",2303.00717v1
+2023-12-08,Beyond spin models in orbitally-degenerate open-shell nanographenes,"The study of open-shell nanographenes has relied on a paradigm where spins
+are the only low-energy degrees of freedom. Here we show that some
+nanographenes can host low-energy excitations that include strongly coupled
+spin and orbital degrees of freedom. The key ingredient is the existence of
+orbital degeneracy, as a consequence of leaving the benzenoid/half-filling
+scenario. We analyze the case of nitrogen-doped triangulenes, using both
+density-functional theory and Hubbard model multiconfigurational and
+random-phase approximation calculations. We find a rich interplay between
+orbital and spin degrees of freedom that confirms the need to go beyond the
+spin-only paradigm, opening a new venue in this field of research.",2312.04938v1
+2006-06-16,Orbitally driven spin-singlet dimerization in $S$=1 La$_{4}$Ru$_{2}$O$_{10}$,"Using x-ray absorption spectroscopy at the Ru-$L_{2,3}$ edge we reveal that
+the Ru$^{4+}$ ions remain in the $S$=1 spin state across the rare 4d-orbital
+ordering transition and spin-gap formation. We find using local spin density
+approximation + Hubbard U (LSDA+U) band structure calculations that the crystal
+fields in the low temperature phase are not strong enough to stabilize the
+$S$=0 state. Instead, we identify a distinct orbital ordering with a
+significant anisotropy of the antiferromagnetic exchange couplings. We conclude
+that La$_{4}$Ru$_{2}$O$_{10}$ appears to be a novel material in which the
+orbital physics drives the formation of spin-singlet dimers in a quasi
+2-dimensional $S$=1 system.",0606445v2
+2018-04-02,Importance of orbital fluctuations for the magnetic dynamics in heavy-fermion compound SmB$_6$,"The emergent dynamical processes associated with magnetic excitations in
+heavy-fermion SmB$_6$ are investigated. By imposing multiorbital interactions
+on a first-principles model, we find the interplay between spin and orbital
+fluctuations in the $f$ manifold is highly sensitive to local correlations. The
+magnetic phase diagram constructed at zero temperature reveals quantum critical
+features with the existence of several competing phases. Within the random
+phase approximation, we perform a comprehensive study of the spin-spin
+correlation function, and our results agree with neutron scattering
+experiments. Spectral weight analysis shows the low energy spin excitations are
+selectively accompanied by orbital fluctuations, indicating a non-trivial
+entanglement between the spin and orbital degree of freedom driven by
+relativistic couplings.",1804.00674v2
+2016-05-31,Spin-Orbit Torques in ferrimagnetic GdFeCo Alloys,"The spin-orbit torque switching of ferrimagnetic
+Gd$_x$(Fe$_{90}$Co$_{10}$)$_{100-x}$ films was studied for both transition
+metal (TM)-rich and rare earth (RE)-rich configurations. The spin-orbit torque
+driven magnetization switching follows the same handedness in TM-rich and
+RE-rich samples with respect to the total magnetization, but the handedness of
+the switching is reversed with respect to the TM magnetization. This indicates
+that the sign of the spin-orbit-torque-driven magnetic switching follows the
+total magnetization, although transport based techniques such as anomalous Hall
+effect are only sensitive to the transition metal magnetization. These results
+provide important insight into the physics of spin angular momentum transfer in
+materials with antiferromagnetically coupled sublattices.",1605.09498v1
+2022-04-27,Quantifying and reducing spin contamination in algebraic diagrammatic construction theory of charged excitations,"Algebraic diagrammatic construction (ADC) theory is a computationally
+efficient and accurate approach for simulating electronic excitations in
+chemical systems. However, for the simulations of excited states in molecules
+with unpaired electrons the performance of ADC methods can be affected by the
+spin contamination in unrestricted Hartree-Fock (UHF) reference wavefunctions.
+In this work, we benchmark the accuracy of ADC methods for electron attachment
+and ionization of open-shell molecules with the UHF reference orbitals
+(EA/IP-ADC/UHF) and develop an approach to quantify the spin contamination in
+the charged excited states. Following this assessment, we demonstrate that the
+spin contamination can be reduced by combining EA/IP-ADC with the reference
+orbitals from restricted open-shell Hartree-Fock (ROHF) or orbital-optimized
+M{\o}ller-Plesset perturbation (OMP) theories. Our numerical results
+demonstrate that for open-shell systems with strong spin contamination in the
+UHF reference the third-order EA/IP-ADC methods with the ROHF or OMP reference
+orbitals are similar in accuracy to equation-of-motion coupled cluster theory
+with single and double excitations.",2204.13164v2
+2013-10-18,Weyl spin-orbit-coupling-induced interactions in uniform and trapped atomic quantum fluids,"We establish through analytical and numerical studies of thermodynamic
+quantities for noninteracting atomic gases that the isotropic three-dimensional
+spin-orbit coupling, the Weyl coupling, induces interaction which counters
+""effective"" attraction (repulsion) of the exchange symmetry present in
+zero-coupling Bose (Fermi) gas. The exact analytical expressions for the grand
+potential and hence for several thermodynamic quantities have been obtained for
+this purpose in both uniform and trapped cases. It is enunciated that many
+interesting features of spin-orbit coupled systems revealed theoretically can
+be understood in terms of coupling-induced modifications in statistical
+interparticle potential. The temperature-dependence of the chemical potential,
+specific heat and isothermal compressibility for a uniform Bose gas is found to
+have signature of the incipient Bose-Einstein condensation in very weak
+coupling regime although the system does not really go in the Bose-condensed
+phase. The transition temperature in harmonically trapped case decreases with
+increase of coupling strength consistent with the weakening of the statistical
+attractive interaction. Anomalous behavior of some thermodynamic quantities,
+partly akin to that in dimensions less than two, appears for uniform fermions
+as soon as the Fermi level goes down the Dirac point on increasing the coupling
+strength. It is suggested that the fluctuation-dissipation theorem can be
+utilized to verify anomalous behaviors from studies of long-wavelength
+fluctuations in bunching and antibunching effects.",1310.5180v1
+2016-11-17,"Hund interaction, spin-orbit coupling and the mechanism of superconductivity in strongly hole-doped iron pnictides","We present a novel mechanism of s-wave pairing in Fe-based superconductors.
+The mechanism involves holes near dxz/dyz pockets only and is applicable
+primarily to strongly hole doped materials. We argue that as long as the
+renormalized Hund's coupling J exceeds the renormalized inter-orbital Hubbard
+repulsion U', any finite spin-orbit coupling gives rise to s-wave
+superconductivity. This holds even at weak coupling and regardless of the
+strength of the intra-orbital Hubbard repulsion U. The transition temperature
+grows as the hole density decreases. The pairing gaps are four-fold symmetric,
+but anisotropic, with the possibility of eight accidental nodes along the
+larger pocket. The resulting state is consistent with the experiments on
+KFe2As2.",1611.05802v1
+2014-04-08,Odd-parity triplet superconductivity in multi-orbital materials with strong spin-orbit coupling: applications to doped Sr2IrO4,"We explore possible superconducting states in $t_{2g}$ multi-orbital
+correlated electron systems with strong spin-orbit coupling (SOC). In order to
+study such systems in a controlled manner, we employ large-scale dynamical
+mean-field theory (DMFT) simulations with the hybridization expansion
+continuous-time Quantum Monte Carlo (CTQMC) impurity solver. To determine the
+pairing symmetry, we go beyond the local DMFT formalism using parquet equations
+to introduce the momentum dependence in the two-particle vertex and correlation
+functions. In the strong SOC limit, a singlet, $d$-wave pairing state in the
+electron-doped side of the phase diagram is observed at weak Hund's coupling,
+which is triggered by antiferromagnetic fluctuations. When the Hund's coupling
+is comparable to SOC, a two-fold degenerate, triplet $p$-wave pairing state
+with relatively high $T_c$ emerges in the hole-doped side of the phase diagram,
+which is associated with enhanced charge fluctuations. Experimental
+implications to doped Sr$_{2}$IrO$_{4}$ are discussed.",1404.2290v2
+2013-09-03,Spin relaxation in ultracold spin-orbit coupled $^{40}$K gas,"We report the anomalous Dyakonov-Perel' spin relaxation in ultracold
+spin-orbit coupled $^{40}$K gas when the coupling between $|9/2,9/2\ >$ and
+$|9/2,7/2\ >$ states (atcing as the effective Zeeman magnetic field) is much
+stronger than the spin-orbit coupled field. Both the transverse and
+longitudinal spin relaxations are investigated with small and large spin
+polarizations. It is found that with small spin polarization, the transverse
+(longitudinal) spin relaxation is divided into four (two) regimes: the normal
+weak scattering regime, the anomalous Dyakonov-Perel'-like regime, the
+anomalous Elliott-Yafet-like regime and the normal strong scattering regime
+(the anomalous Elliott-Yafet-like regime and the normal strong scattering
+regime), with only the normal weak scattering regime being in the weak
+scattering limit. This is very different from the conventional situation under
+the weak magnetic field, which is divided into the weak and strong scattering
+regimes according to the weak/strong scattering limit. With large spin
+polarization, we find that the Hartree-Fock self-energy, which acts as an
+effective magnetic field, can markedly suppress the transverse spin relaxation
+in both weak and strong scattering limits. Moreover, by noting that as both the
+momentum relaxation time and the Hartree-Fock effective magnetic field vary
+with the scattering length in cold atoms, the anomalous Dyakonov-Perel'-like
+regime is suppressed and the transverse spin relaxation is hence divided into
+three regimes in the scattering length dependence: the normal weak scattering
+regime, the anomalous Elliott-Yafet-like regime and the strong scattering
+regime. On the other hand, the longitudinal spin relaxation is again divided
+into the anomalous EY-like and normal strong scattering regimes. ...",1309.0727v3
+2010-04-26,Orbital Order and Spontaneous Orthorhombicity in Iron Pnictides,"A growing list of experiments show orthorhombic electronic anisotropy in the
+iron pnictides, in some cases at temperatures well above the spin density wave
+transition. These experiments include neutron scattering, resistivity and
+magnetoresistance measurements, and a variety of spectroscopies. We explore the
+idea that these anisotropies stem from a common underlying cause: orbital order
+manifest in an unequal occupation of $d_{xz}$ and $d_{yz}$ orbitals, arising
+from the coupled spin-orbital degrees of freedom. We emphasize the distinction
+between the total orbital occupation (the integrated density of states), where
+the order parameter may be small, and the orbital polarization near the Fermi
+level which can be more pronounced. We also discuss light-polarization studies
+of angle-resolved photoemission, and demonstrate how x-ray absorption linear
+dichroism may be used as a method to detect an orbital order parameter.",1004.4611v2
+2018-05-07,Anatomy of interfacial spin-orbit coupling in Co/Pd multilayers using X-ray magnetic circular dichroism and first-principles calculations,"Element-specific orbital magnetic moments and their anisotropies in
+perpendicularly magnetised Co/Pd multilayers are investigated using Co L-edge
+and Pd M-edge angle-dependent x-ray magnetic circular dichroism. We show that
+the orbital magnetic moments in Co are anisotropic, whereas those in Pd are
+isotropic. The first-principles density-functional-theory calculations also
+suggest that the Co/Pd interfacial orbital magnetic moments in Co are
+anisotropic and contribute to the perpendicular magnetic anisotropy (PMA), and
+that the isotropic ones in Pd manipulates the Co orbitals at the interface
+through proximity effects. Orbital-resolved anatomy of Co/Pd interfaces reveals
+that the orbital moment anisotropy in Co and spin-flipped transition related to
+the magnetic dipoles in Pd are essential for the appearance of PMA.",1805.02416v1
+2019-07-09,Orbital pseudospin-momentum locking in two-dimensional chiral borophene,"Recently, orbital-textures have been found in Rashba and topological
+insulator (TI) surface states as a result of the spin-orbit coupling (SOC).
+Here, we predict a $p_x/p_y$ orbital texture, in linear dispersive Dirac bands,
+arising at the K/K' points of $\chi$-$h_0$ borophene chiral monolayer.
+Combining first-principles calculations with effective hamiltonians, we show
+that the orbital pseudospin has its direction locked with the momentum in a
+similar way as TIs' spin-textures. Additionally, considering a layer pseudospin
+degree of freedom, this lattice allows stackings of layers with equivalent or
+opposite chiralities. In turn, we show a control of the orbital textures and
+layer localization through the designed stacking and external electric field.
+For instance, for the opposite chirality stacking, the electric field allows
+for an on/off switch of the orbital-textured Dirac cone.",1907.04351v2
+2019-12-17,Tuning Crystal Field Potential by Orbital Dilution in $d^4$ Oxides,"We investigate the interplay between Coulomb driven orbital order and
+octahedral distortions in strongly correlated Mott insulators due to orbital
+dilution, i.e., doping by metal ions without an orbital degree of freedom. In
+particular, we focus on layered transition metal oxides and study the effective
+spin-orbital exchange due to $d^3$ substitution at $d^4$ sites. The structure
+of the $d^3-d^4$ spin-orbital coupling between the impurity and the host in the
+presence of octahedral rotations favors a distinct type of orbital polarization
+pointing towards the impurity and outside the impurity--host plane. This yields
+an effective lattice potential that generally competes with that associated
+with flat octahedra and, in turn, can drive an inversion of the crystal field
+interaction.",1912.07975v1
+2014-02-17,Persistent charge and spin currents in the long wavelength regime for graphene rings,"We address the problem of persistent charge and spin currents on a Corbino
+disk built from a graphene sheet. We consistently derive the Hamiltonian
+including kinetic, intrinsic (ISO) and Rashba spin-orbit interactions in
+cylindrical coordinates. The Hamiltonian is carefully considered to reflect
+hermiticity and covariance. We compute the energy spectrum and the
+corresponding eigenfunctions separately for the intrinsic and Rashba spin-orbit
+interactions. In order to determine the charge persistent currents we use the
+spectrum equilibrium linear response definition. We also determine the spin and
+pseudo spin polarizations associated with such equilibrium currents. For the
+intrinsic case one can also compute the correct currents by applying the bare
+velocity operator to the ISO wavefunctions or alternatively the ISO group
+velocity operator to the free wavefunctions. Charge currents for both SO
+couplings are maximal in the vicinity of half integer flux quanta. Such maximal
+currents are protected from thermal effects because contributing levels plunge
+($\sim$1K) into the Fermi sea at half integer flux values. Such a mechanism,
+makes them observable at readily accessible temperatures. Spin currents only
+arise for the Rashba coupling, due to the spin symmetry of the ISO spectrum.
+For the Rashba coupling, spin currents are cancelled at half integer fluxes but
+they remain finite in the vicinity, and the same scenario above protects spin
+currents.",1402.4103v1
+2023-07-28,Spin Hall conductivity in the Kane-Mele-Hubbard model at finite temperature,"The Kane-Mele model is known to show a quantized spin Hall conductivity at
+zero temperature. Including Hubbard interactions at each site leads to a
+quantum phase transition to an XY antiferromagnet at sufficiently high
+interaction strength. Here, we use the two-particle self-consistent approach
+(TPSC), which we extend to include spin-orbit coupling, to investigate the
+Kane-Mele-Hubbard model at finite temperature and half-filling. TPSC is a weak
+to intermediate coupling approach capable of calculating a frequency- and
+momentum-dependent self-energy from spin and charge fluctuations. We present
+results for the spin Hall conductivity and correlation lengths for
+antiferromagnetic spin fluctuations for different values of temperature,
+spin-orbit coupling and Hubbard interaction. The vertex corrections, which here
+are analogues of Maki-Thompson contributions, show a strong momentum dependence
+and give a large contribution in the vicinity of the phase transition at all
+temperatures. Their inclusion is necessary to observe the quantization of the
+spin Hall conductivity for the interacting system in the zero temperature
+limit. At finite temperature, increasing the Hubbard interaction leads to a
+decrease of the spin Hall conductivity. This decrease can be explained by
+band-gap renormalization from scattering of electrons on antiferromagnetic spin
+fluctuations.",2307.15652v2
+2006-03-06,Magnetism of iron: from the bulk to the monoatomic wire,"The magnetic properties of iron (spin and orbital magnetic moments,
+magnetocrystalline anisotropy energy) in various geometries and
+dimensionalities are investigated by using a parametrized tight-binding model
+in an $s$, $p$ and $d$ atomic orbital basis set including spin polarization and
+the effect of spin-orbit coupling. The validity of this model is well
+established by comparing the results with those obtained by using an ab-initio
+code. This model is applied to the study of iron in bulk bcc and fcc phases,
+$(110)$ and $(001)$ surfaces and to the monatomic wire, at several interatomic
+distances. New results are derived. The variation of the component of the
+orbital magnetic moment on the spin quantization axis has been studied as a
+function of depth, revealing a significant enhancement in the first two layers,
+especially for the $(001)$ surface. It is found that the magnetic anisotropy
+energy is drastically increased in the wire and can reach several meV. This is
+also true for the orbital moment, which in addition is highly anisotropic.
+Furthermore it is shown that when the spin quantization axis is neither
+parallel nor perpendicular to the wire the average orbital moment is not
+aligned with the spin quantization axis. At equilibrium distance the easy
+magnetization axis is along the wire but switches to the perpendicular
+direction under compression. The success of this model opens up the possibility
+of obtaining accurate results on other elements and systems with much more
+complex geometries.",0603121v1
+2005-01-12,"Valence-Bond Crystal, and Lattice Distortions in a Pyrochlore Antiferromagnet with Orbital Degeneracy","We discuss the ground state properties of a spin 1/2 magnetic ion with
+threefold $t_{2g}$ orbital degeneracy on a highly frustrated pyrochlore
+lattice, like Ti$^{3+}$ ion in B-spinel MgTi$_2$O$_4$. We formulate an
+effective spin-orbital Hamiltonian and study its low energy sector by
+constructing several exact-eigenstates in the limit of vanishing Hund's
+coupling. We find that orbital degrees of freedom modulate the spin-exchange
+energies, release the infinite spin-degeneracy of pyrochlore structure, and
+drive the system to a non-magnetic spin-singlet manifold. The latter is a
+collection of spin-singlet dimers and is, however, highly degenerate with
+respect of dimer orientations. This ``orientational'' degeneracy is then lifted
+by a magneto-elastic interaction that optimizes the previous energy gain by
+distorting the bonds in suitable directions and leading to a tetragonal phase.
+In this way a valence bond crystal state is formed, through the condensation of
+dimers along helical chains running around the tetragonal c-axis, as actually
+observed in MgTi$_2$O$_4$. The orbitally ordered pattern in the dimerized phase
+is predicted to be of ferro-type along the helices and of antiferro-type
+between them. Finally, through analytical considerations as well as numerical
+ab-initio simulations, we predict a possible experimental tool for the
+observation of such an orbital ordering, through resonant x-ray scattering.",0501289v1
+2021-07-01,Charge disproportionation and Hund's insulating behavior in a five-orbital Hubbard model applicable to $d^4$ perovskites,"We explore the transition to a charge-disproportionated insulating phase in a
+five-orbital cubic tight-binding model applicable to transition-metal
+perovskites with a formal $d^4$ occupation of the transition-metal cation, such
+as ferrates or manganites. We use dynamical mean-field theory to obtain the
+phase diagram as a function of the average local Coulomb repulsion $U$ and the
+Hund's coupling $J$. The main structure of the phase diagram follows from the
+zero band-width (atomic) limit and represents the competition between high-spin
+and low-spin homogeneous and an inhomogeneous charge-disproportionated state.
+This results in two distinct insulating phases: the standard homogeneous Mott
+insulator and the inhomogeneous charge-disproportionated insulator, recently
+also termed Hund's insulator. We characterize the unconventional nature of this
+Hund's insulating state. Our results are consistent with previous studies of
+two- and three-orbital models applicable to isolated $t_{2g}$ and $e_g$
+subshells, respectively, with the added complexity of the low-spin/high-spin
+transition. We also test the applicability of an effective two-orbital
+($e_g$-only) model with disordered $S=3/2$ $t_{2g}$ core spins. Our results
+show that the overall features of the phase diagram in the high-spin region are
+well described by this simplified two-orbital model but also that the spectral
+features exhibit pronounced differences compared to the full five-orbital
+description.",2107.00348v2
+2017-09-21,Orbital loop currents in iron-based superconductors,"We show that the antiferromagnetic state commonly observed in the phase
+diagrams of the iron-based superconductors necessarily triggers loop currents
+characterized by charge transfer between different Fe $ 3d $ orbitals. This
+effect is rooted on the glide-plane symmetry of these materials and on the
+existence of an atomic spin-orbit coupling that couples states at the $X$ and
+$Y$ points of the 1-Fe Brillouin zone. In the particular case in which the
+magnetic moments are aligned parallel to the magnetic ordering vector direction
+which is the moment configuration most commonly found in the iron-based
+superconductors these loop currents involve the $d_{xy}$ orbital and either the
+$d_{yz}$ orbital (if the moments point along the $y$ axis) or the $d_{xz}$
+orbitals (if the moments point along the $x$ axis). We show that the two main
+manifestations of the orbital loop currents are the emergence of magnetic
+moments in the pnictide/chalcogen site and an orbital-selective band splitting
+in the magnetically ordered state, both of which could be detected
+experimentally. Our results highlight the unique intertwining between orbital
+and spin degrees of freedom in the iron-based superconductors, and reveal the
+emergence of an unusual correlated phase that may impact the normal state and
+superconducting properties of these materials.",1709.07266v2
+2013-03-18,BCS-BEC crossover at finite temperature in spin-orbit coupled Fermi gases,"By adopting a $T$-matrix-based method within the $G_0G$ approximation for the
+pair susceptibility, we study the effects of the pairing fluctuation on the
+three-dimensional spin-orbit coupled Fermi gases at finite temperature. The
+critical temperatures of the superfluid/normal phase transition are determined
+for three different types of spin-orbit coupling (SOC): (1) the extreme oblate
+(EO) or Rashba SOC, (2) the extreme prolate (EP) or equal Rashba-Dresselhaus
+SOC, and (3) the spherical (S) SOC. For EO- and S-type SOC, the SOC dependence
+of the critical temperature signals a crossover from BCS to BEC state; at
+strong SOC limit, the critical temperature recover those of ideal BEC of
+rashbons. The pairing fluctuation induces a pseudogap in the fermionic
+excitation spectrum in both superfluid and normal phases. We find that, for EO-
+and S-type SOC, even at weak coupling, sufficiently strong SOC can induce
+sizable pseudogap. Our research suggests that the spin-orbit coupled Fermi
+gases may open new means to the study of the pseudogap formation in fermionic
+systems.",1303.4136v2
+2016-07-19,Kondo effect in a quantum wire with spin-orbit coupling,"The influence of spin-orbit interactions on the Kondo effect has been under
+debate recently. Studies conducted recently on a system composed by an Anderson
+impurity on a 2DEG with Rashba spin-orbit have been shown that it can enhance
+or suppress the Kondo temperature ($T_{\rm K}$), depending on the relative
+energy level position of the impurity with respect to the particle-hole
+symmetric point. Here we investigate a system composed by a single Anderson
+impurity side-coupled to a quantum wire with spin-orbit coupling (SOC). We
+derive an effective Hamiltonian in which the Kondo coupling is modified by the
+SOC. In addition, the Hamiltonian contains two other scattering terms, the so
+called Dzaloshinskyi-Moriya interaction, know to appear in these systems, and a
+new one describing processes similar to the Elliott-Yafet scattering
+mechanisms. By performing a renormalization group analysis on the effective
+Hamiltonian, we find that the correction on the Kondo coupling due to the SOC
+favors and enhancement of the Kondo temperature even in the particle-hole
+symmetric point of the Anderson model, agreeing with the NRG results. Moreover,
+away from the particle-hole symmetric point, $T_{\rm K}$ always increases with
+the SOC, accordingly with the previous renormalization group analysis.",1607.05684v1
+2020-11-30,"Graphene on two-dimensional hexagonal BN, AlN, and GaN: Electronic, spin-orbit, and spin relaxation properties","We investigate the electronic structure of graphene on a series of 2D
+hexagonal nitride insulators hXN, X = B, Al, and Ga, with DFT calculations. A
+symmetry-based model Hamiltonian is employed to extract orbital parameters and
+spin-orbit coupling (SOC) from the low-energy Dirac bands of proximitized
+graphene. While commensurate hBN induces a staggered potential of about 10 meV
+into the Dirac bands, less lattice-matched hAlN and hGaN disrupt the Dirac
+point much less, giving a staggered gap below 100 $\mu$eV. Proximitized
+intrinsic SOC surprisingly does not increase much above the pristine graphene
+value of 12 $\mu$eV; it stays in the window of (1-16) $\mu$eV, depending
+strongly on stacking. However, Rashba SOC increases sharply when increasing the
+atomic number of the boron group, with calculated maximal values of 8, 15, and
+65 $\mu$eV for B, Al, and Ga-based nitrides, respectively. The individual
+Rashba couplings also depend strongly on stacking, vanishing in
+symmetrically-sandwiched structures, and can be tuned by a transverse electric
+field. The extracted spin-orbit parameters were used as input for spin
+transport simulations based on Chebyshev expansion of the time-evolution of the
+spin expectation values, yielding interesting predictions for the electron spin
+relaxation. Spin lifetime magnitudes and anisotropies depend strongly on the
+specific (hXN)/graphene/hXN system, and they can be efficiently tuned by an
+applied external electric field as well as the carrier density in the graphene
+layer. A particularly interesting case for experiments is graphene/hGaN, in
+which the giant Rashba coupling is predicted to induce spin lifetimes of 1-10
+ns, short enough to dominate over other mechanisms, and lead to the same spin
+relaxation anisotropy as observed in conventional semiconductor
+heterostructures: 50\%, meaning that out-of-plane spins relax twice as fast as
+in-plane spins.",2011.14588v2
+2011-04-23,Nuclear Dynamics During Landau-Zener Singlet-Triplet Transitions in Double Quantum Dots,"We consider nuclear spin dynamics in a two-electron double dot system near
+the intersection of the electron spin singlet $S$ and the lower energy
+component $T_{+}$ of the spin triplet. The electron spin interacts with nuclear
+spins and is influenced by the spin-orbit coupling. Our approach is based on a
+quantum description of the electron spin in combination with the coherent
+semiclassical dynamics of nuclear spins. We consider single and double
+Landau-Zener passages across the $S$-$T_{+}$ anticrossings. For linear sweeps,
+the electron dynamics is expressed in terms of parabolic cylinder functions.
+The dynamical nuclear polarization is described by two complex conjugate
+functions $\Lambda ^{\pm}$ related to the integrals of the products of the
+singlet and triplet amplitudes ${\tilde{c}}_{S}^{\ast}{\tilde{c}}_{T_{+}}$
+along the sweep. The real part $P$ of $\Lambda ^{\pm}$ is related to the
+$S$-$T_{+}$ spin-transition probability, accumulates in the vicinity of the
+anticrossing, and for long linear passages coincides with the Landau-Zener
+probability $P_{LZ}=1-e^{-2\pi \gamma}$, where $\gamma $ is the Landau-Zener
+parameter. The imaginary part $Q$ of $\Lambda^{+}$ is specific for the nuclear
+spin dynamics, accumulates during the whole sweep, and for $\gamma \gtrsim 1$
+is typically an order of magnitude larger than $P$. $Q$ has a profound effect
+on the nuclear spin dynamics, by (i) causing intensive shake-up processes among
+the nuclear spins and (ii) producing a high nuclear spin generation rate when
+the hyperfine and spin-orbit interactions are comparable in magnitude. We find
+analytical expressions for the back-action of the nuclear reservoir represented
+via the change in the Overhauser fields the electron subsystem experiences.",1104.4591v1
+2021-11-07,A correctly scaling rigorously spin-adapted and spin-complete open-shell CCSD implementation for arbitrary high-spin states,"In this paper, we report on a correctly scaling novel coupled cluster singles
+and doubles (CCSD) implementation for arbitrary high-spin open-shell states.
+The chosen cluster operator is completely spin-free, i.e. employs spatial
+substitutions only. It is composed of our recently developed L\""owdin-type
+operators (doi: 10.1063/5.0026762), which ensure (1) spin completeness and (2)
+spin adaption i.e. spin purity of the CC wave function. In contrast to the
+proof-of-concept matrix-representation-based implementation presented there,
+the present implementation relies on second quantization and factorized tensor
+contractions. The generated singles and doubles operators are embedded in an
+equation generation engine. In the latter, Wick's theorem is used to derive
+prefactors arising from spin integration directly from the spin-free full
+contraction patterns. The obtained Wick terms composed of products of Kronecker
+deltas are represented by special non-antisymmetrized Goldstone diagrams.
+Identical (redundant) diagrams are identified by solving the underlying graph
+isomorphism problem. All non-redundant graphs are then automatically translated
+to locally -- one term at a time -- factorized tensor contractions. Finally,
+the spin-adapted and spin-complete (SASC) CCS and CCSD variants are applied to
+a set of small molecular test systems. Both correlation energies and amplitude
+norms hint towards a reasonable convergence of the SASC-CCSD method for a BCH
+series truncation of order four. In comparison to spin orbital CCSD, SASC-CCSD
+leads to slightly improved correlation energies with differences of up to 0.886
+mE_H (0.98% w.r.t. spin orbital CCSD(T)).",2111.04186v1
+2007-10-15,Significant g-factor values of a two-electron ground state in quantum dots with spin-orbit coupling,"The magnetization of semiconductor quantum dots in the presence of spin-orbit
+coupling and interactions is investigated numerically. When the dot is occupied
+by two electrons we find that a level crossing between the two lowest many-body
+eigenstates may occur as a function of the spin-orbit coupling strength. This
+level crossing is accompanied by a non-vanishing magnetization of the
+ground-state. Using first order perturbation theory as well as exact numerical
+diagonalization of small clusters we show that the tendency of interactions to
+cause Stoner-like instability is enhanced by the SO coupling. The resulting
+g-factor can have a significant value, and thus may influence g-factor
+measurements. Finally we propose an experimental method by which the predicted
+phenomenon can be observed.",0710.2772v2
+2015-07-09,Trion-polaritons : How strong coupling to a cavity changes the orbital and spin properties of trions,"The elementary optical excitations of a two-dimensional electron system
+strongly coupled to a microcavity are trion-polaritons. Using a variational
+approach, we demonstrate that the competition between Coulomb interaction and
+light-matter coupling plays a crucial role in determining the lowest-energy
+orbital and spin properties of trion-polaritons. When the light-matter
+interaction exceeds the bare trion binding, singlet and triplet trion states
+are mixed due to a cavity-mediated spin-orbit effect, which in turn results in
+a strong increase of the outer electron Bohr radius. In this strong cavity
+coupling regime, the trion-polariton consists of an exciton-polariton
+surrounded by a weakly bound electron and is reminiscent of a coherent Rydberg
+excitation.",1507.02480v2
+2018-04-25,Energy levels repulsion by spin-orbit coupling in two-dimensional Rydberg excitons,"We study the effects of Rashba spin-orbit coupling on two-dimensional Rydberg
+exciton systems. Using analytical and numerical arguments we demonstrate that
+this coupling considerably modifies the wave functions and leads to a level
+repulsion that results in a deviation from the Poissonian statistics of the
+adjacent level distance distribution. This signifies the crossover to
+non-integrability of the system and hints on the possibility of quantum chaos
+emerging. Such a behavior strongly differs from the classical realization,
+where spin-orbit coupling produces highly entangled, chaotic electron
+trajectories in an exciton. We also calculate the oscillator strengths and show
+that randomization appears in the transitions between states with different
+total momenta.",1804.09545v1
+2018-11-27,Cavity-induced spin-orbit coupling in an interacting bosonic wire,"We consider theoretically ultra-cold interacting bosonic atoms confined to a
+wire geometry and coupled to the field of an optical cavity. A spin-orbit
+coupling is induced via Raman transitions employing a cavity mode and a
+transverse running wave pump beam, the transition imprints a spatial dependent
+phase onto the atomic wavefunction. Adiabatic elimination of the cavity field
+leads to an effective Hamiltonian for the atomic degrees of freedom, with a
+self-consistency condition. We map the spin-orbit coupled bosonic wire to a
+bosonic ladder in a magnetic field, by discretizing the spatial dimension.
+Using the numerical density matrix renormalization group method, we show that
+in the continuum limit the dynamical stabilization of a Meissner superfluid is
+possible, for parameters achievable by nowadays experiments.",1811.11045v2
+2015-12-09,General conditions for proximity-induced odd-frequency superconductivity in two-dimensional electronic systems,"We obtain the general conditions for the emergence of odd-frequency
+superconducting pairing in a two-dimensional (2D) electronic system
+proximity-coupled to a superconductor, making minimal assumptions about both
+the 2D system and the superconductor. Using our general results we show that a
+simple heterostructure formed by a monolayer of a group VI transition metal
+dichalcogenide, such as molybdenum disulfide, and an s-wave superconductor with
+Rashba spin-orbit coupling will exhibit odd-frequency superconducting pairing.
+Furthermore, we show that in such a heterostructure the odd-frequency pairing
+amplitude will be proportional to the product of the Rashba spin-orbit coupling
+in the substrate and the spin-orbit coupling in the dichalcogenide layer.",1512.03068v2
+2019-07-19,A cryogenic memory element based on an anomalous Josephson junction,"We propose a non-volatile memory element based on a lateral ferromagnetic
+Josephson junction with spin-orbit coupling and out-of-plane magnetization. The
+interplay between the latter and the intrinsic exchange field of the
+ferromagnet leads to a magnetoelectric effect that couples the charge current
+through the junction and its magnetization, such that by applying a current
+pulse the direction of the magnetic moment in F can be switched. The two memory
+states are encoded in the direction of the out-of-plane magnetization. With the
+aim to determine the optimal working temperature for the memory element, we
+explore the noise-induced effects on the averaged stationary magnetization by
+taking into account thermal fluctuations affecting both the Josephson phase and
+the magnetic moment dynamics. We investigate the switching process as a
+function of intrinsic parameters of the ferromagnet, such as the Gilbert
+damping and strength of the spin-orbit coupling, and proposed a non-destructive
+readout scheme based on a dc-SQUID. Additionally, we analyze a way to protect
+the memory state from external perturbations by voltage gating in systems with
+a both linear-in-momentum Rashba and Dresselhaus spin-orbit coupling.",1907.08454v2
+2022-05-17,Magnetism and metal-insulator transitions in the Rashba-Hubbard model,"The nature of metal-insulator and magnetic transitions is still a subject
+under intense debate in condensed matter physics. Amongst the many possible
+mechanisms, the interplay between electronic correlations and spin-orbit
+couplings is an issue of a great deal of interest, in particular when dealing
+with quasi-2D compounds. In view of this, here we use a Hartree-Fock approach
+to investigate how the Rashba spin-orbit coupling, $V_\text{SO}$, affects the
+magnetic ordering provided by a Hubbard interaction, $U$, on a square lattice.
+At half-filling, we have found a sequence of transitions for increasing
+$V_\text{SO}$: from a Mott insulator to a metallic antiferromagnet, and then to
+a paramagnetic Rashba metal. Also, our results indicate that the Rashba
+coupling favors magnetic striped phases in the doped regime. By analyzing
+spectral properties, we associate the rearrangement of the magnetic ordering
+with the emerging chirality created by the spin-orbit coupling. Our findings
+provide insights towards clarifying the competition between these tendencies.",2205.08651v1
+2022-06-20,Enhanced superconductivity through virtual tunneling in Bernal bilayer graphene coupled to WSe$_2$,"Motivated by a recent experiment [arXiv:2205.05087], we investigate a
+possible mechanism that enhances superconductivity in hole-doped Bernal bilayer
+graphene due to a proximate WSe$_2$ monolayer. We show that the virtual
+tunneling between WSe$_2$ and Bernal bilayer graphene, which is known to induce
+Ising spin-orbit coupling, can generate an additional attraction between two
+holes, providing a potential explanation for enhancing superconductivity in
+Bernal bilayer graphene. Using microscopic interlayer tunneling, we derive the
+Ising spin-orbit coupling and the effective attraction as functions of the
+twist angle between Bernal bilayer graphene and the WSe$_2$ monolayer. Our
+theory provides an intuitive and physical explanation for the intertwined
+relation between Ising spin-orbit coupling and superconductivity enhancement,
+which should motivate future studies.",2206.09922v3
+2003-05-27,The nonrelativistic limit of the relativistic point coupling model,"We relate the relativistic finite range mean-field model (RMF-FR) to the
+point-coupling variant and compare the nonlinear density dependence. From this,
+the effective Hamiltonian of the nonlinear point-coupling model in the
+nonrelativistic limit is derived. Different from the nonrelativistic models,
+the nonlinearity in the relativistic models automatically yields contributions
+in the form of a weak density dependence not only in the central potential but
+also in the spin-orbit potential. The central potential affects the bulk and
+surface properties while the spin-orbit potential is crucial for the shell
+structure of finite nuclei. A modification in the Skyrme-Hartree-Fock model
+with a density-dependent spin-orbit potential inspired by the point-coupling
+model is suggested.",0305078v1
+2009-02-25,Low-energy theory and RKKY interaction for interacting quantum wires with Rashba spin-orbit coupling,"We present the effective low-energy theory for interacting 1D quantum wires
+subject to Rashba spin-orbit coupling. Under a one-loop renormalization group
+scheme including all allowed interaction processes for not too weak Rashba
+coupling, we show that electron-electron backscattering is an irrelevant
+perturbation. Therefore no gap arises and electronic transport is described by
+a modified Luttinger liquid theory. As an application of the theory, we discuss
+the RKKY interaction between two magnetic impurities. Interactions are shown to
+induce a slower power-law decay of the RKKY range function than the usual 1D
+noninteracting $\cos(2k_F x)/|x|$ law. Moreover, in the noninteracting Rashba
+wire, the spin-orbit coupling causes a twisted (anisotropic) range function
+with several different spatial oscillation periods. In the interacting case, we
+show that one special oscillation period leads to the slowest decay, and
+therefore dominates the RKKY interaction for large separation.",0902.4402v2
+2012-07-29,Anisotropic dynamics of a spin-orbit coupled Bose-Einstein condensate,"By calculating the density response function we identify the excitation
+spectrum of a Bose-Einstein condensate with equal Rashba and Dresselhaus
+spin-orbit coupling. We find that the velocity of sound along the direction of
+spin-orbit coupling is deeply quenched and vanishes when one approaches the
+second-order phase transition between the plane wave and the zero momentum
+quantum phases. We also point out the emergence of a roton minimum in the
+excitation spectrum for small values of the Raman coupling, providing the onset
+of the transition to the stripe phase. Our findings point out the occurrence of
+a strong anisotropy in the dynamic behavior of the gas. A hydrodynamic
+description accounting for the collective oscillations in both uniform and
+harmonically trapped gases is also derived.",1207.6804v2
+2012-11-01,Matter-wave bright solitons in spin-orbit coupled Bose-Einstein condensates,"We study matter-wave bright solitons in spin-orbit (SO) coupled Bose-Einstein
+condensates (BECs) with attractive interatomic interactions. We use a
+multiscale expansion method to identify solution families for chemical
+potentials in the semi-infinite gap of the linear energy spectrum. Depending on
+the linear and spin-orbit coupling strengths, the solitons may resemble either
+standard bright nonlinear Schr\""{o}dinger solitons or exhibit a modulated
+density profile, reminiscent of the stripe phase of SO-coupled repulsive BECs.
+Our numerical results are in excellent agreement with our analytical findings,
+and demonstrate the potential robustness of such solitons for experimentally
+relevant conditions through stability analysis and direct numerical
+simulations.",1211.0199v1
+2016-04-12,Hybridization and spin-orbit coupling effects in quasi-one-dimensional spin-1/2 magnet Ba3Cu3Sc4O12,"We study electronic and magnetic properties of the quasi-one-dimensional
+spin-1/2 magnet Ba3Cu3Sc4O12 with a distinct orthogonal connectivity of CuO4
+plaquettes. An effective low-energy model taking into account spin-orbit
+coupling was constructed by means of first-principles calculations. On this
+basis a complete microscopic magnetic model of Ba3Cu3Sc4O12, including
+symmetric and antisymmetric anisotropic exchange interactions, is derived. The
+anisotropic exchanges are obtained from a distinct first-principles numerical
+scheme combining, on one hand, the local density approximation taking into
+account spin-orbit coupling, and, on the other hand, projection procedure along
+with the microscopic theory by Toru Moriya. The resulting tensors of the
+symmetric anisotropy favor collinear magnetic order along the structural chains
+with the leading ferromagnetic coupling J1 = -9.88 meV. The interchain
+interactions J8 = 0.21 meV and J5 = 0.093 meV are antiferromagnetic. Quantum
+Monte Carlo simulations demonstrated that the proposed model reproduces the
+experimental Neel temperature, magnetization and magnetic susceptibility data.
+The modeling of neutron diffraction data reveals an important role of the
+covalent Cu-O bonding in Ba3Cu3Sc4O12.",1604.03333v1
+2019-05-02,Analytical solution of narrow quantum rings with general Rashba and Dresselhaus spin-orbit couplings,"We solve analytically the energy eigenvalue problem of narrow semiconductor
+quantum rings with a general spin-orbit term that includes as a special case
+the Rashba and Dresselhaus interactions acting simultaneously. The eigenstates
+and eigenenergies of the system are found for arbitrary values of the
+spin-orbit coupling constants without making use of approximations. The general
+eigenstates are expressed as products of a scalar Mathieu function and a spinor
+factor which is periodic or pseudo-periodic on the ring. Our general solution
+reduces to the previously found solutions for particular combinations of the
+Rashba and Dresselhaus couplings, like the well-studied cases of Rashba-only
+and of equal coupling constants.",1905.00878v1
+2014-06-27,Energy spectrum of a harmonically trapped two-atom system with spin-orbit coupling,"Ultracold atomic gases provide a novel platform with which to study
+spin-orbit coupling, a mechanism that plays a central role in the nuclear shell
+model, atomic fine structure and two-dimensional electron gases. This paper
+introduces a theoretical framework that allows for the efficient determination
+of the eigenenergies and eigenstates of a harmonically trapped two-atom system
+with short-range interaction subject to an equal mixture of Rashba and
+Dresselhaus spin-orbit coupling created through Raman coupling of atomic
+hyperfine states. Energy spectra for experimentally relevant parameter
+combinations are presented and future extensions of the approach are discussed.",1406.7177v1
+2019-08-19,Energetics and structural properties of two- and three-boson systems in the presence of 1D spin-orbit coupling,"It was shown recently that the discrete scaling symmetry, which underlies the
+Efimov effect in the three identical boson system with two-body short-range
+interactions, survives when single-particle 1D spin-orbit coupling terms are
+added to the Hamiltonian. Each three-body energy level in the ordinary Efimov
+scenario turns into an energy manifold that contains four energy levels in the
+presence of 1D spin-orbit coupling (equal mixture of Rashba-Dresselhaus
+coupling). This work provides a detailed characterization of the energy levels
+in these manifolds. The two-boson energies, which enter into the three-boson
+scattering threshold, are analyzed in detail. Moreover, the structural
+properties, e.g., momentum distributions of the two- and three-boson systems,
+are analyzed for various parameter combinations.",1908.06918v1
+2015-11-25,Interplay of Rashba spin orbit coupling and disorder in the conductance properties of a four terminal junction device,"We report a thorough theoretical investigation on the quantum transport of a
+disordered four terminal device in the presence of Rashba spin orbit coupling
+(RSOC) in two dimensions. Specifically we compute the behaviour of the
+longitudinal (charge) conductance, spin Hall conductance and spin Hall
+conductance fluctuation as a function of the strength of disorder and Rashba
+spin orbit interaction using the Landauer Buttiker formalism via Green's
+function technique. Our numerical calculations reveal that both the
+conductances diminish with disorder. At smaller values of the RSOC parameter,
+the longitudinal and spin Hall conductances increase, while both vanish in the
+strong RSOC limit. The spin current is more drastically affected by both
+disorder and RSOC than its charge counterpart. The spin Hall conductance
+fluctuation does not show any universality in terms of its value and it depends
+on both disorder as well as on the RSOC strength. Thus the spin Hall
+conductance fluctuation has a distinct character compared to the fluctuation in
+the longitudinal conductance. Further one parameter scaling theory is studied
+to assess the transition to a metallic regime as claimed in literature and we
+find no confirmation about the emergence of a metallic state induced by RSOC.",1511.07966v3
+2017-11-28,Spin transport in high-mobility graphene on WS$_2$ substrate with electric-field tunable proximity spin-orbit interaction,"Graphene supported on a transition metal dichalcogenide substrate offers a
+novel platform to study the spin transport in graphene in presence of a
+substrate induced spin-orbit coupling, while preserving its intrinsic charge
+transport properties. We report the first non-local spin transport measurements
+in graphene completely supported on a 3.5 nm thick tungsten disulfide (WS$_2$)
+substrate, and encapsulated from the top with a 8 nm thick hexagonal boron
+nitride layer. For graphene, having mobility up to 16,000
+cm$^2$V$^{-1}$s$^{-1}$, we measure almost constant spin-signals both in
+electron and hole-doped regimes, independent of the conducting state of the
+underlying WS$_2$ substrate, which rules out the role of spin-absorption by
+WS$_2$. The spin-relaxation time $\tau_{\text{s}}$ for the electrons in
+graphene-on-WS$_2$ is drastically reduced down to~10 ps than $\tau_{\text{s}}$
+~ 800 ps in graphene-on-SiO$_2$ on the same chip. The strong suppression of
+$\tau_{\text{s}}$ along with a detectable weak anti-localization signature in
+the quantum magneto-resistance measurements is a clear effect of the WS$_2$
+induced spin-orbit coupling (SOC) in graphene. Via the top-gate voltage
+application in the encapsulated region, we modulate the electric field by 1
+V/nm, changing $\tau_{\text{s}}$ almost by a factor of four which suggests the
+electric-field control of the in-plane Rashba SOC. Further, via carrier-density
+dependence of $\tau_{\text{s}}$ we also identify the fingerprints of the
+D'yakonov-Perel' type mechanism in the hole-doped regime at the graphene-WS$_2$
+interface.",1711.10293v1
+2021-08-08,Origin of Rashba spin-splitting and strain tunability in ferroelectric bulk CsPbF$_3$,"Spin-orbit coupling (SOC) in conjunction with broken inversion symmetry acts
+as a key ingredient for several intriguing quantum phenomena viz. persistent
+spin textures, topological surface states and Rashba-Dresselhaus (RD) effects.
+The coexistence of spontaneous polarization and the RD effect in ferroelectric
+materials enables the electrical control of spin degree of freedom. In light of
+this, we explore here the ferroelectric lead halide perovskite viz. CsPbF$_3$
+as a potential candidate in the field of spintronics by employing
+state-of-the-art first-principles based methodologies viz. density functional
+theory (DFT) with semi-local and hybrid functional (HSE06) combined with
+spin-orbit coupling (SOC) and many-body perturbation theory (G$_0$W$_0$). For a
+deeper understanding of the observed spin-splitting, we have analyzed the spin
+textures within the combined framework of DFT and $\textbf{k.p}$ model
+Hamiltonian. The latter confirms that there is no out of plane spin component
+indicating that the Rashba splitting dominates over Dresselhaus splitting in
+this system. Owing to the presence of Pb-6$p$ orbital in conduction band, the
+large value of Rashba coefficient ($\alpha_R$) at conduction band minimum (CBm)
+is noticed in comparison to that of at the valence band maximum (VBM). Notably,
+we also observe that strength of Rashba spin-splitting can be substancially
+tuned on application of uniaxial strain ($\pm5\%$). This finding will further
+pave the path for perovskite-based spintronics devices.",2108.03683v2
+2021-11-02,Evidence for anisotropic spin-triplet Andreev reflection at the 2D van der Waals ferromagnet/superconductor interface,"Fundamental symmetry breaking and relativistic spin-orbit coupling give rise
+to fascinating phenomena in quantum materials. Of particular interest are the
+interfaces between ferromagnets and common s-wave superconductors, where the
+emergent spin-orbit fields support elusive spin-triplet superconductivity,
+crucial for superconducting spintronics and topologically-protected Majorana
+bound states. Here, we report the observation of large magnetoresistances at
+the interface between a quasi-two-dimensional van der Waals ferromagnet
+Fe0.29TaS2 and a conventional s-wave superconductor NbN, which provides the
+possible experimental evidence for the spin triplet Andreev reflection and
+induced spin-triplet superconductivity at ferromagnet/superconductor interface
+arising from Rashba spin-orbit coupling. The temperature, voltage, and
+interfacial barrier dependences of the magnetoresistance further support the
+induced spin-triplet superconductivity and spin-triplet Andreev reflection.
+This discovery, together with the impressive advances in two-dimensional van
+der Waals ferromagnets, opens an important opportunity to design and probe
+superconducting interfaces with exotic properties.",2111.01360v2
+2023-05-24,Flat band separation and robust spin-Berry curvature in bilayer kagome metals,"Kagome materials have emerged as a setting for emergent electronic phenomena
+that encompass different aspects of symmetry and topology. It is debated
+whether the XV$_6$Sn$_6$ kagome family (where X is a rare earth element), a
+recently discovered family of bilayer kagome metals, hosts a topologically
+non-trivial ground state resulting from the opening of spin-orbit coupling
+gaps. These states would carry a finite spin-Berry curvature, and topological
+surface states. Here, we investigate the spin and electronic structure of the
+XV$_6$Sn$_6$ kagome family. We obtain evidence for a finite spin-Berry
+curvature contribution at the center of the Brillouin zone, where the nearly
+flat band detaches from the dispersing Dirac band because of spin-orbit
+coupling. In addition, the spin-Berry curvature is further investigated in the
+charge density wave regime of ScV$_6$Sn$_6$, and it is found to be robust
+against the onset of the temperature-driven ordered phase. Utilizing the
+sensitivity of angle resolved photoemission spectroscopy to the spin and
+orbital angular momentum, our work unveils the spin-Berry curvature of
+topological kagome metals, and helps to define its spectroscopic fingerprint.",2305.15345v1
+2018-12-03,"Heterostructures of graphene and hBN: electronic, spin-orbit, and spin relaxation properties from first principles","We perform extensive first-principles calculations for heterostructures
+composed of monolayer graphene and hexagonal boron nitride (hBN). Employing a
+symmetry-derived minimal tight-binding model, we extract orbital and spin-orbit
+coupling (SOC) parameters for graphene on hBN, as well as for hBN encapsulated
+graphene. Our calculations show that the parameters depend on the specific
+stacking configuration of graphene on hBN. We also perform an interlayer
+distance study for the different graphene/hBN stacks to find the corresponding
+lowest energy distances. For very large interlayer distances, one can recover
+the pristine graphene properties, as we find from the dependence of the
+parameters on the interlayer distance. Furthermore, we find that orbital and
+SOC parameters, especially the Rashba one, depend strongly on an applied
+transverse electric field, giving a rich playground for spin physics. Armed
+with the model parameters, we employ the Dyakonov-Perel formalism to calculate
+the spin relaxation in graphene/hBN heterostructures. We find spin lifetimes in
+the nanosecond range, in agreement with recent measurements. The spin
+relaxation anisotropy, being the ratio of out-of-plane to in-plane spin
+lifetimes, is found to be giant close to the charge neutrality point,
+decreasing with increasing doping, and being highly tunable by an external
+transverse electric field. This is in contrast to bilayer graphene in which an
+external field saturates the spin relaxation anisotropy.",1812.00866v2
+2015-06-09,Universal chiral-triggered magnetization switching in confined nanodots,"Spin orbit interactions are rapidly emerging as the key for enabling
+efficient current-controlled spintronic devices. Much work has focused on the
+role of spin-orbit coupling at heavy metal/ferromagnet interfaces in generating
+current-induced spin-orbit torques. However, the strong influence of the
+spin-orbit-derived Dzyaloshinskii-Moriya interaction (DMI) on spin textures in
+these materials is now becoming apparent. Recent reports suggest DMI-stabilized
+homochiral domain walls (DWs) can be driven with high efficiency by spin torque
+from the spin Hall effect. However, the influence of the DMI on the
+current-induced magnetization switching has not been explored nor is yet
+well-understood, due in part to the difficulty of disentangling spin torques
+and spin textures in nano-sized confined samples. Here we study the
+magnetization reversal of perpendicular magnetized ultrathin dots, and show
+that the switching mechanism is strongly influenced by the DMI, which promotes
+a universal chiral non-uniform reversal, even for small samples at the
+nanoscale. We show that ultrafast current-induced and field-induced
+magnetization switching consists on local magnetization reversal with domain
+wall nucleation followed by its propagation along the sample. These findings,
+not seen in conventional materials, provide essential insights for
+understanding and exploiting chiral magnetism for emerging spintronics
+applications.",1506.02893v1
+2022-09-07,Hidden spin-orbital texture at the $\barΓ$-located valence band maximum of a transition metal dichalcogenide semiconductor,"Finding stimuli capable of driving an imbalance of spin-polarised electrons
+within a solid is the central challenge in the development of spintronic
+devices. However, without the aid of magnetism, routes towards this goal are
+highly constrained with only a few suitable pairings of compounds and driving
+mechanisms found to date. Here, through spin- and angle-resolved photoemission
+along with density functional theory, we establish how the $p$-derived bulk
+valence bands of semiconducting 1T-HfSe$_2$ possess a local, ground-state spin
+texture spatially confined within each Se-sublayer due to strong
+sublayer-localised electric dipoles orientated along the $c$-axis. This hidden
+spin-polarisation manifests in a `coupled spin-orbital texture' with
+in-equivalent contributions from the constituent $p$-orbitals. While the
+overall spin-orbital texture for each Se sublayer is in strict adherence to
+time-reversal symmetry (TRS), spin-orbital mixing terms with net polarisations
+at time-reversal invariant momenta are locally maintained. These apparent
+TRS-breaking contributions dominate, and can be selectively tuned between with
+a choice of linear light polarisation, facilitating the observation of
+pronounced spin-polarisations at the Brillouin zone centre for all $k_z$. We
+discuss the implications for the generation of spin-polarised populations from
+1T-structured transition metal dichalcogenides using a fixed energy, linearly
+polarised light source.",2209.03110v1
+2002-10-18,Coherent spin valve phenomena and electrical spin injection in ferromagnetic/semiconductor/ferromagnetic junctions,"Coherent quantum transport in ferromagnetic/ semiconductor/ ferromagnetic
+junctions is studied theoretically within the Landauer framework of ballistic
+transport. We show that quantum coherence can have unexpected implications for
+spin injection and that some intuitive spintronic concepts which are founded in
+semi-classical physics no longer apply: A quantum spin-valve (QSV) effect
+occurs even in the absence of a net spin polarized current flowing through the
+device, unlike in the classical regime. The converse effect also arises, i.e. a
+zero spin-valve signal for a non-vanishing spin-current. We introduce new
+criteria useful for analyzing quantum and classical spin transport phenomena
+and the relationships between them. The effects on QSV behavior of
+spin-dependent electron transmission at the interfaces, interface Schottky
+barriers, Rashba spin-orbit coupling and temperature, are systematically
+investigated. While the signature of the QSV is found to be sensitive to
+temperature, interestingly, that of its converse is not. We argue that the QSV
+phenomenon can have important implications for the interpretation of
+spin-injection in quantum spintronic experiments with spin-valve geometries.",0210391v1
+2005-07-06,Co-planar spin-polarized light emitting diode,"Studies of spin manipulation in semiconductors has benefited from the
+possibility to grow these materials in high quality on top of optically active
+III-V systems. The induced electroluminescence in these layered semiconductor
+heterostructures has been used for a reliable spin detection. In semiconductors
+with strong spin-orbit interaction, the sensitivity of vertical devices may be
+insufficient, however, because of the sepration of the spin aligner part and
+the spin detection region by one or more heterointerfaces and becuse of the
+short spin coherence length. Here we demostrate that higly sensitive spin
+detection can be achieved using a lateral arrangement of the spin polarized and
+optically active regions. Using our co-planar spin-polarized light emitting
+diodes we detect electrical field induced spin generation in a semiconductor
+heterojunction two-dimensional hole gas. The polarization results from spin
+asymmetric recombination of injected electrons with strongly SO coupled
+two-dimensional holes. The possibility to detect magnetized Co particles
+deposited on the co-planar diode structure is also demonstrated.",0507143v1
+2006-12-21,Deduction of Pure Spin Current from Spin Linear and Circular Photogalvanic Effect in Semiconductor Quantum Wells,"We study the spin photogalvanic effect in two-dimensional electron system
+with structure inversion asymmetry by means of the solution of semiconductor
+optical Bloch equations. It is shown that a linearly polarized light may inject
+a pure spin current in spin-splitting conduction bands due to Rashba spin-orbit
+coupling, while a circularly polarized light may inject spin-dependent
+photocurrent. We establish an explicit relation between the photocurrent by
+oblique incidence of a circularly polarized light and the pure spin current by
+normal incidence of a linearly polarized light such that we can deduce the
+amplitude of spin current from the measured spin photocurrent experimentally.
+This method may provide a source of spin current to study spin transport in
+semiconductors quantitatively.",0612542v1
+2014-10-07,Y3Fe5O12 Spin Pumping for Quantitative Understanding of Pure Spin Transport and Spin Hall Effect in a Broad Range of Materials,"Using Y3Fe5O12 (YIG) thin films grown by our sputtering technique, we study
+dynamic spin transport in nonmagnetic (NM), ferromagnetic (FM) and
+antiferromagnetic (AF) materials by ferromagnetic resonance (FMR) spin pumping.
+From both inverse spin Hall effect (ISHE) and damping enhancement, we determine
+the spin mixing conductance and spin Hall angle in many metals. Surprisingly,
+we observe robust spin conduction in AF insulators excited by an adjacent YIG
+at resonance. This demonstrates that YIG spin pumping is a powerful and
+versatile tool for understanding spin Hall physics, spin-orbit coupling (SOC),
+and magnetization dynamics in a broad range of materials.",1410.1597v1
+2014-10-10,Spin Hall effect associated with SU(2) gauge field,"In this paper, we focus on the connection between spin Hall effect and spin
+force. Here we investigate that the spin force due to spin-orbit coupling,
+which in two-dimensional system is equivalent to forces of Hirsch and
+Chudnovsky besides constant factors 3 and 3/2 respectively, is a part of
+classic Anandan force, and that the spin Hall effect is an anomalous Hall
+effect. Furthermore, we develop the method of AC phase to derive the formula
+for the spin force, and find that the most basic spin Hall effect originates
+from the AC phase and is therefore an intrinsic quantum mechanical property of
+spin. This method differs from approach of Berry phase in the study of
+anomalous Hall effect, which is the intrinsic property of the perfect crystal.
+On the other hand, we use an elegant skill to show that the Chudnovsky-Drude
+model is reasonable, and further have improved the theoretical values of spin
+Hall conductivity of Chudnovsky. Compared to the theoretical values of spin
+Hall conductivity in the Chudnovsky-Drude model, ours are in better agreement
+with experimentation. Finally, we discuss the relation between spin Hall effect
+and fractional statistics.",1410.3429v1
+2014-11-11,Spin Relaxation Mechanism in a Highly Doped Organic Polymer Film,"We report the systematic studies of spin current transport and relaxation
+mechanism in highly doped organic polymer film. In this study, we have
+determined spin diffusion length (SDL), spin lifetime, and spin diffusion
+constant by using different experimental techniques. The spin lifetime
+estimated from the electron paramagnetic resonance experiment is much shorter
+than the previous expectation beyond the experimental ambiguity. This suggests
+that significantly large spin diffusion constant, which is reasonably explained
+by the hopping transport mechanism in degenerate semiconductors, exists in
+highly doped organic semiconductors. The calculated SDL using the spin lifetime
+and spin diffusion constant estimated from our experiment is comparable to the
+experimentally obtained SDL of the order of one hundred nanometers. Moreover,
+the present study revealed that the spin angular momentum is almost preserved
+in the hopping events. In other words, the spin relaxation mainly occurs due to
+the spin-orbit coupling at the nanoscale crystalline grains.",1411.2740v1
+2019-05-04,Skyrmion quantum spin Hall effect,"The quantum spin Hall effect is conventionally thought to require a strong
+spin-orbit coupling, producing an effective spin-dependent magnetic field.
+However, spin currents can also be present without transport of spins, for
+example, in spin-waves or skyrmions. In this paper, we show that topological
+skyrmionic spin textures can be used to realize a quantum spin Hall effect.
+From basic arguments relating to the single-valuedness of the wave function, we
+deduce that loop integrals of the derivative of the Hamiltonian must have a
+spectrum that is integer multiples of $ 2 \pi $. By relating this to the spin
+current, we form a new quantity called the quantized spin current which obeys a
+precise quantization rule. This allows us to derive a quantum spin Hall effect,
+which we illustrate with an example of a spin-1 Bose-Einstein condensate.",1905.01459v2
+2017-03-06,Spin circuit representation of spin pumping,"Circuit theory has been tremendously successful in translating physical
+equations into circuit elements in organized form for further analysis and
+proposing creative designs for applications. With the advent of new materials
+and phenomena in the field of spintronics and nanomagnetics, it is imperative
+to construct the spin circuit representations for different materials and
+phenomena. Spin pumping is a phenomenon by which a pure spin current can be
+injected into the adjacent layers. If the adjacent layer is a material with a
+high spin orbit coupling, a considerable amount of charge voltage can be
+generated via inverse spin Hall effect, allowing spin detection. Here we
+develop the spin circuit representation of spin pumping. We then combine it
+with the spin circuit representation for the materials having spin Hall effect
+to show that it reproduces the standard results in literature. We further show
+how complex multilayers can be analyzed by simply writing a netlist.",1704.02338v1
+2022-01-04,A comprehensive theory of second-order spin photocurrents,"The spin photocurrents, direct currents induced by light, hold great promise
+for introducing new elements to spintronics. However, a general theory for spin
+photocurrents in real materials which is applicable to systems with spin-orbit
+coupling or noncollinear magnetism is absent. Here, we develop such a general
+theory of second-order spin photocurrents. We find that the secondorder spin
+photocurrents can be classified into Drude, Berry curvature dipole, shift,
+injection, and rectification currents, which have different physical origins
+and symmetry properties. Surprisingly, our theory predicts a direct pure spin
+rectification current in an insulator induced by photons with energies lower
+than the material band gap. This phenomenon is absent in the case of the charge
+photocurrent. We find that the pure spin current of BiTeI induced by subgap
+light is large enough to be observable in experiments. Moreover, the subgap
+pure spin photocurrent is highly tunable with the polarization of light and the
+flowing direction of the spin photocurrent. This study lays the groundwork for
+the study of nonlinear spin photocurrents in real materials and provides a
+route to engineer light-controlled spin currents.",2201.01301v1
+2023-07-23,Algorithm for spin symmetry operation search,"A spin space group provides a suitable way to fully exploit the symmetry of a
+spin arrangement with a negligible spin-orbit coupling. There has been a
+growing interest in applying spin symmetry analysis with the spin space group
+in the field of magnetism. However, there is no established algorithm to search
+for spin symmetry operations of the spin space group. This paper presents an
+exhaustive algorithm for determining spin symmetry operations of commensurate
+spin arrangements. The present algorithm searches for spin symmetry operations
+from the symmetry operations of a corresponding nonmagnetic crystal structure
+and determines their spin-rotation parts by solving a Procrustes problem. An
+implementation is distributed under a permissive free software license in
+spinspg v0.1.1: https://github.com/spglib/spinspg.",2307.12228v2
+2017-12-10,Effective gauge field theory of spintronics,"The aim of this paper is to present a comprehensive theory of spintronics
+phenomena based on the concept of effective gauge field, the spin gauge field.
+An effective gauge field generally arises when we change a basis to describe
+system and describes low energy properties of the system. In the case of
+ferromagnetic metals we consider, it arises from structures of localized spin
+(magnetization) and couples to spin current of conduction electron. The first
+half of the paper is devoted to quantum mechanical arguments and phenomenology.
+We show that the spin gauge field has adiabatic and nonadiabatic (off-diagonal)
+components, consisting an SU(2) gauge field. The adiabatic component gives rise
+to spin Berry's phase, topological Hall effect and spin motive force, while
+nonadiabatic components are essential for spin-transfer torque and spin pumping
+effects by inducing nonequilibrium spin accumulation. In the latter part of the
+paper, field theoretic approaches are described. Dynamics of localized spins in
+the presence of applied spin-polarized current is studied in a microscopic
+viewpoint, and current-driven domain wall motion is discussed. Recent
+developments on interface spin-orbit interaction is also mentioned.",1712.03489v2
+2019-12-27,Extrinsic spin Hall effect in inhomogeneous systems,"Charge-to-spin conversion in inhomogeneous systems is studied theoretically.
+  We consider free electrons subject to impurities with spin-orbit interaction
+and with spatially modulated distribution, and calculate spin accumulation and
+spin current induced by an external electric field.
+  It is found that the spin accumulation is induced by the vorticity of
+electron flow through the side-jump and skew-scattering processes, and the
+differences of the two processes are discussed.
+  The results can be put in a form of generalized spin diffusion equation with
+a spin source term given by the divergence of the spin Hall current.
+  This spin source term reduces to the form of spin-vorticity coupling when the
+spin Hall angle is independent of impurity concentration. We also study the
+effects of long-range Coulomb interaction, which is indispensable when the
+process involves charge inhomogeneity and accumulation as in the present
+problem.",1912.12077v2
+2023-03-08,Spin selective charge recombination in chiral donor-bridge-acceptor triads,"In this paper we outline a physically motivated framework for describing
+spin-selective recombination processes in chiral systems, from which we derive
+spin-selective reaction operators for recombination reactions of
+donor-bridge-acceptor molecules, where the electron transfer is mediated by
+chirality and spin-orbit coupling. In general the recombination process is
+selective only for spin-coherence between singlet and triplet states, and it is
+not in general selective for spin polarisation. We find that spin polarisation
+selectivity only arises in hopping mediated electron transfer. We describe how
+this effective spin-polarisation selectivity is a consequence of
+spin-polarisation generated transiently in the intermediate state. The
+recombination process also augments the coherent spin dynamics of the charge
+separated state, which is found to have a significant effect on recombination
+dynamics and to destroy any long-lived spin polarisation. Although we only
+consider a simple donor-bridge-acceptor system, the framework we present here
+can be straightforwardly extended to describe spin-selective recombination
+processes in more complex systems.",2303.04742v1
+2023-10-06,Spin-vibronic dynamics in open-shell systems beyond the spin Hamiltonian formalism,"Vibronic coupling has a dramatic influence over a large number of molecular
+processes, ranging from photo-chemistry, to spin relaxation and electronic
+transport. The simulation of vibronic coupling with multi-reference
+wavefunction methods has been largely applied to organic compounds, and only
+early efforts are available for open-shell systems such as transition metal and
+lanthanide complexes. In this work, we derive a numerical strategy to
+differentiate the molecular electronic Hamiltonian in the context of
+multi-reference ab initio methods and inclusive of spin-orbit coupling effects.
+We then provide a formulation of open quantum system dynamics able to predict
+the time evolution of the electrons' density matrix under the influence of a
+Markovian phonon bath up to fourth-order perturbation theory. We apply our
+method to Co(II) and Dy(III) molecular complexes exhibiting long spin
+relaxation times and successfully validate our strategy against the use of an
+effective spin Hamiltonian. Our study shed light on the nature of vibronic
+coupling, the importance of electronic excited states in spin relaxation, and
+the need for high-level computational chemistry to quantify it.",2310.04278v2
+2020-12-17,Superconducting Orbital Magnetoelectric Effect and its Evolution across the Superconductivity Normal Metal Phase Transition,"Superconducting magnetoelectric effect, which is the current-induced
+magnetization in a superconductor, mainly focused on the spin magnetization in
+previous studies, but ignore the effect of the orbital magnetic moments carried
+by the paired Bloch electrons. In this work, we show that orbital magnetic
+moments in superconductors can induce large orbital magnetization in the
+presence of a current. We constructed a unified description for the
+current-induced spin and orbital magnetization across the superconductivity
+normal metal phase transition. We find that in a superconductor with uniform
+pairing, the current-induced magnetization at a given current density is the
+same as that in its normal metal state, while with the nonuniform
+superconducting pairing, the current-induced magnetization exhibits an abrupt
+change in magnitude near the superconductivity normal metal phase transition.
+Importantly, our theory predicts the orbital magnetoelectric effect in
+superconducting twisted bilayer graphene which has paired Bloch electrons with
+large orbital magnetic moments and negligible spin-orbit coupling. We propose
+that the measurement of the current-induced orbital magnetoelectric effect can
+be used to detect the possible nonuniform pairings in twisted bilayer graphene
+and other newly discovered superconductors with non-trivial Berry curvatures.",2012.09896v3
+1996-04-09,Chaos in Schwarzschild Spacetime : The Motion of a Spinning Particle,"We study the motion of a spinning test particle in Schwarzschild spacetime,
+analyzing the Poincar\'e map and the Lyapunov exponent. We find chaotic
+behavior for a particle with spin higher than some critical value (e.g. $S_{cr}
+\sim 0.64 \mu M$ for the total angular momentum $J=4 \mu M$), where $\mu$ and
+$M$ are the masses of a particle and of a black hole, respectively. The inverse
+of the Lyapunov exponent in the most chaotic case is about three orbital
+periods, which suggests that chaos of a spinning particle may become important
+in some relativistic astrophysical phenomena. The ``effective potential""
+analysis enables us to classify the particle orbits into four types as follows.
+When the total angular momentum $J$ is large, some orbits are bounded and the
+``effective potential""s are classified into two types: (B1) one saddle point
+(unstable circular orbit) and one minimal point (stable circular orbit) on the
+equatorial plane exist for small spin; and (B2) two saddle points bifurcate
+from the equatorial plane and one minimal point remains on the equatorial plane
+for large spin. When $J$ is small, no bound orbits exist and the potentials are
+classified into another two types: (U1) no extremal point is found for small
+spin; and (U2) one saddle point appears on the equatorial plane, which is
+unstable in the direction perpendicular to the equatorial plane, for large
+spin. The types (B1) and (U1) are the same as those for a spinless particle,
+but the potentials (B2) and (U2) are new types caused by spin-orbit coupling.
+The chaotic behavior is found only in the type (B2) potential. The
+``heteroclinic orbit'', which could cause chaos, is also observed in type (B2).",9604020v1
+2018-03-12,Rotation-symmetry-enforced coupling of spin and angular momentum for p-orbital bosons,"Intrinsic spin angular-momentum coupling of an electron has a relativistic
+quantum origin with the coupling arising from charged-orbits, which does not
+carry over to charge-neutral atoms. Here we propose a mechanism of spontaneous
+generation of spin angular-momentum coupling with spinor atomic bosons loaded
+into $p$-orbital bands of a two-dimensional optical-lattice. This spin
+angular-momentum coupling originates from many-body correlations and
+spontaneous symmetry breaking in a superfluid, with the key ingredients
+attributed to spin-channel quantum fluctuations and an approximate rotation
+symmetry. The resultant spin angular-momentum intertwined superfluid has Dirac
+excitations. In presence of a chemical potential difference for adjacent sites,
+it provides a bosonic analogue of a symmetry-protected-topological insulator.
+Through a dynamical mean-field calculation, this novel superfluid is found to
+be a generic low-temperature phase, and it gives way to Mott localization only
+at strong interactions and even-integer fillings. We show the temperature to
+reach this order is accessible with present experiments.",1803.04429v2
+2010-03-31,Quantum transport in a curved one-dimensional quantum wire with spin-orbit interactions,"The one-dimensional effective Hamiltonian for a planar curvilinear quantum
+wire with arbitrary shape is proposed in the presence of the Rashba spin-orbit
+interaction. Single electron propagation through a device of two straight lines
+conjugated with an arc has been investigated and the analytic expressions of
+the reflection and transmission probabilities have been derived. The effects of
+the device geometry and the spin-orbit coupling strength $\alpha$ on the
+reflection and transmission probabilities and the conductance are investigated
+in the case of spin polarized electron incidence. We find that no spin-flip
+exists in the reflection of the first junction. The reflection probabilities
+are mainly influenced by the arc angle and the radius, while the transmission
+probabilities are affected by both spin-orbit coupling and the device geometry.
+The probabilities and the conductance take the general behavior of oscillation
+versus the device geometry parameters and $\alpha $. Especially the electron
+transportation varies periodically versus the arc angle $\theta_{w}$. We also
+investigate the relationship between the conductance and the electron energy,
+and find that electron resonant transmission occurs for certain energy.
+Finally, the electron transmission for the incoming electron with arbitrary
+state is considered. For the outgoing electron, the polarization ratio is
+obtained and the effects of the incoming electron state are discussed. We find
+that the outgoing electron state can be spin polarization and reveal the
+polarized conditions.",1003.5972v1
+2010-06-03,Spin-Orbit Effects in Carbon-Nanotube Double Quantum Dots,"We study the energy spectrum of symmetric double quantum dots in narrow-gap
+carbon nanotubes with one and two electrostatically confined electrons in the
+presence of spin-orbit and Coulomb interactions. Compared to GaAs quantum dots,
+the spectrum exhibits a much richer structure because of the spin-orbit
+interaction that couples the electron's isospin to its real spin through two
+independent coupling constants. In a single dot, both constants combine to
+split the spectrum into two Kramers doublets, while the antisymmetric constant
+solely controls the difference in the tunneling rates of the Kramers doublets
+between the dots. For the two-electron regime, the detailed structure of the
+spin-orbit split energy spectrum is investigated as a function of detuning
+between the quantum dots in a 22-dimensional Hilbert space within the framework
+of a single-longitudinal-mode model. We find a competing effect of the
+tunneling and Coulomb interaction. The former favors a left-right symmetric
+two-particle ground state, while in the regime where the Coulomb interaction
+dominates over tunneling, a left-right antisymmetric ground state is found. As
+a result, ground states on both sides of the $(11)$-$(02)$ degeneracy point may
+possess opposite left-right symmetry, and the electron dynamics when tuning the
+system from one side of the $(11)$-$(02)$ degeneracy point to the other is
+controlled by three selection rules (in spin, isospin, and left-right
+symmetry). We discuss implications for the spin-dephasing and Pauli blockade
+experiments.",1006.0724v2
+2010-09-26,Exotic phases induced by strong spin-orbit coupling in ordered double perovskites,"We construct and analyze a microscopic model for insulating rock salt ordered
+double perovskites, with the chemical formula A$_2$BB'O$_6$, where the B' atom
+has a 4d$^1$ or 5d$^1$ electronic configuration and forms a face centered cubic
+(fcc) lattice. The combination of the triply-degenerate $t_{2g}$ orbital and
+strong spin-orbit coupling forms local quadruplets with an effective spin
+moment $j=3/2$. Moreover, due to strongly orbital-dependent exchange, the
+effective spins have substantial biquadratic and bicubic interactions (fourth
+and sixth order in the spins, respectively). This leads, at the mean field
+level, to three main phases: an unusual antiferromagnet with dominant octupolar
+order, a ferromagnetic phase with magnetization along the $[110]$ direction,
+and a non-magnetic but quadrupolar ordered phase, which is stabilized by
+thermal fluctuations and intermediate temperatures. All these phases have a two
+sublattice structure described by the ordering wavevector ${\boldsymbol Q}
+=2\pi (001)$. We consider quantum fluctuations and argue that in the regime of
+dominant antiferromagnetic exchange, a non-magnetic valence bond solid or
+quantum spin liquid state may be favored instead. Candidate quantum spin liquid
+states and their basic properties are described. We also address the effect of
+single-site anisotropy driven by lattice distortions. Existing and possible
+future experiments are discussed in light of these results.",1009.5115v1
+2012-07-02,Experimental observation of the optical spin-orbit torque,"Spin polarized carriers electrically injected into a magnet from an external
+polarizer can exert a spin transfer torque (STT) on the magnetization. The phe-
+nomenon belongs to the area of spintronics research focusing on manipulating
+magnetic moments by electric fields and is the basis of the emerging
+technologies for scalable magnetoresistive random access memories. In our
+previous work we have reported experimental observation of the optical
+counterpart of STT in which a circularly polarized pump laser pulse acts as the
+external polarizer, allowing to study and utilize the phenomenon on several
+orders of magnitude shorter timescales than in the electric current induced
+STT. Recently it has been theoretically proposed and experimentally
+demonstrated that in the absence of an external polarizer, carriers in a magnet
+under applied electric field can develop a non-equilibrium spin polarization
+due to the relativistic spin-orbit coupling, resulting in a current induced
+spin-orbit torque (SOT) acting on the magnetization. In this paper we report
+the observation of the optical counterpart of SOT. At picosecond time-scales,
+we detect excitations of magnetization of a ferromagnetic semiconductor
+(Ga,Mn)As which are independent of the polarization of the pump laser pulses
+and are induced by non-equilibrium spin-orbit coupled photo-holes.",1207.0307v1
+2020-11-27,Few-electron Single and Double Quantum Dots in an InAs Two-Dimensional Electron Gas,"Most proof-of-principle experiments for spin qubits have been performed using
+GaAs-based quantum dots because of the excellent control they offer over
+tunneling barriers and the orbital and spin degrees of freedom. Here, we
+present the first realization of high-quality single and double quantum dots
+hosted in an InAs two-dimensional electron gas (2DEG), demonstrating accurate
+control down to the few-electron regime, where we observe a clear Kondo effect
+and singlet-triplet spin blockade. We measure an electronic $g$-factor of $16$
+and a typical magnitude of the random hyperfine fields on the dots of $\sim
+0.6\, \mathrm{mT}$. We estimate the spin-orbit length in the system to be $\sim
+5-10\, \mu \mathrm{m}$, which is almost two orders of magnitude longer than
+typically measured in InAs nanostructures, achieved by a very symmetric design
+of the quantum well. These favorable properties put the InAs 2DEG on the map as
+a compelling host for studying fundamental aspects of spin qubits. Furthermore,
+having weak spin-orbit coupling in a material with a large Rashba coefficient
+potentially opens up avenues for engineering structures with spin-orbit
+coupling that can be controlled locally in space and/or time.",2011.13865v1
+2023-07-29,Charge-Spin Conversion in Two-Subband Quantum Wells with Conventional and Unconventional Rashba Spin-Orbit Coupling,"The reciprocal interconversion between spin polarization and charge current
+(CSC) is the focus of intensive theoretical and experimental investigation in
+spintronics research. Its physical origin stems from the Rashba spin-orbit
+coupling (SOC) induced by the breaking of the structure inversion symmetry. The
+steady-state interconversion efficiency is the result of the non-trivial spin
+textures of the electric-field distorted Fermi surface. Its full understanding
+and evaluation requires the consideration of disorder-induced relaxation
+effects in the presence of spin-orbit induced band splitting. In this paper the
+additional effect of the orbital degree of freedom is analyzed in a two-subband
+quantum well with both conventional and unconventional Rashba SOC in the
+presence of disorder impurity scattering. The latter is treated at the level of
+the Born approximation in the Green's function self-energy and with the
+inclusion of vertex corrections in the linear response functions for the charge
+current and the spin polarization. By explicitly considering the symmetry
+properties of the Hamiltonian the matrix structure of the correlation functions
+is shown to decompose in independent blocks of symmetry-related physical
+observables. We find that the inclusion of vertex corrections is important for
+the correct estimate of the CSC efficiency, which also depends on the position
+of the Fermi level. We also find that the relative sign of the Rashba SOC in
+the two subbands plays a key role in determining the behavior of the CSC.
+Finally, we point out how the two-subband model compares with the standard
+single-band two-dimensional electron gas.",2307.15923v1
+2021-05-24,Role of two-dimensional Ising superconductivity in the non-equilibrium quasiparticle spin-to-charge conversion efficiency,"Non-equilibrium studies of two-dimensional (2D) superconductors (SCs) with
+Ising spin-orbit coupling are prerequisite for their successful application to
+equilibrium spin-triplet Cooper pairs and, potentially, Majorana fermions. By
+taking advantage of the recent discoveries of 2D SCs and their compatibility
+with any other materials, we fabricate here non-local magnon devices to examine
+how such 2D Ising superconductivity affects the conversion efficiency of magnon
+spin to quasiparticle charge in superconducting flakes of 2H-NbSe2 transferred
+onto ferrimagnetic insulating Y3Fe5O12. Comparison with a reference device
+based on a conventionally paired superconductor shows that the Y3Fe5O12-induced
+in-plane (IP) exchange spin-splitting in the NbSe2 flake is hindered by its
+inherent out-of-plane (OOP) spin-orbit-field, which, in turn, limits the
+transition-state enhancement of the spin-to-charge conversion efficiency. Our
+out-of-equilibrium study highlights the significance of symmetry matching
+between underlying Cooper pairs and exchange-induced spin-splitting for the
+giant transition-state spin-to-charge conversion and may have implications
+towards proximity-engineered spin-polarized triplet pairing via tuning the
+relative strength of IP exchange and OOP spin-orbit fields in ferromagnetic
+insulator/2D Ising SC bilayers.",2105.11159v4
+2018-08-20,Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design,"Spin-orbit coupling (SOC), the interaction between the electron spin and the
+orbital angular momentum, can unlock rich phenomena at interfaces, in
+particular interconverting spin and charge currents. Conventional heavy metals
+have been extensively explored due to their strong SOC of conduction electrons.
+However, spin-orbit effects in classes of materials such as epitaxial
+5d-electron transition metal complex oxides, which also host strong SOC, remain
+largely unreported. In addition to strong SOC, these complex oxides can also
+provide the additional tuning knob of epitaxy to control the electronic
+structure and the engineering of spin-to-charge conversion by crystalline
+symmetry. Here, we demonstrate room-temperature generation of spin-orbit torque
+on a ferromagnet with extremely high efficiency via the spin-Hall effect in
+epitaxial metastable perovskite SrIrO3. We first predict a large intrinsic
+spin-Hall conductivity in orthorhombic bulk SrIrO3 arising from the Berry
+curvature in the electronic band structure. By manipulating the intricate
+interplay between SOC and crystalline symmetry, we control the spin-Hall torque
+ratio by engineering the tilt of the corner-sharing oxygen octahedra in
+perovskite SrIrO3 through epitaxial strain. This allows the presence of an
+anisotropic spin-Hall effect due to a characteristic structural anisotropy in
+SrIrO3 with orthorhombic symmetry. Our experimental findings demonstrate the
+heteroepitaxial symmetry design approach to engineer spin-orbit effects. We
+therefore anticipate that these epitaxial 5d transition-metal oxide thin films
+can be an ideal building block for low-power spintronics.",1808.06650v1
+2015-04-06,Vortex Dynamics in a Spin-Orbit Coupled Bose-Einstein Condensate,"Vortices in a one-component dilute atomic ultracold Bose-Einstein condensate
+(BEC) usually arise as a response to externally driven rotation. Apart from a
+few special situations, these vortices are singly quantized with unit
+circulation. Recently, the NIST group has constructed a two-component BEC with
+a spin-orbit coupled Hamiltonian involving Pauli matrices, and I here study the
+dynamics of a two-component vortex in such a spin-orbit coupled condensate.
+These spin-orbit coupled BECs use an applied magnetic field to split the
+hyperfine levels. Hence they rely on a focused laser beam to trap the atoms. In
+addition, two Raman laser beams create an effective (or synthetic) gauge
+potential. The resulting spin-orbit Hamiltonian is discussed in some detail.
+The various laser beams are fixed in the laboratory, so that it is not feasible
+to nucleate a vortex by an applied rotation that would need to rotate all the
+laser beams and the magnetic field. In a one-component BEC, a vortex can also
+be created by a thermal quench, starting from the normal state and suddenly
+cooling deep into the condensed state. I propose that a similar method would
+work for a vortex in a spin-orbit coupled BEC. Such a vortex has two
+components, and each has its own circulation quantum number. If both components
+have the same circulation, I find that the composite vortex should execute
+uniform precession, like that observed in a single-component BEC. In contrast,
+if one component has unit circulation and the other has zero circulation, then
+some fraction of the dynamical vortex trajectories should eventually leave the
+condensate, providing clear experimental evidence for this unusual vortex
+structure. In the context of exciton-polariton condensates, such a vortex is
+known as a ""half-quantum vortex"".",1504.01314v1
+2015-12-16,Spin-orbit transitions in $α$ and $γ$-CoV$_{2}$O$_{6}$,"$\gamma$-triclinic and $\alpha$-monoclinic polymorphs of CoV$_{2}$O$_{6}$ are
+two of the few known transition metal ion based materials that display stepped
+$1/3$ magnetization plateaus at low temperatures. Neutron diffraction [M.
+Markkula et al. Phys. Rev. B 86, 134401 (2012)], x-ray dichroism [N. Hollmann
+et al. Phys. Rev. B 89, 201101(R) (2014)], and dielectric measurements [K.
+Singh et al. J. Mater. Chem. 22, 6436 (2012)] have shown a coupling between
+orbital, magnetic and structural orders in CoV$_{2}$O$_{6}$. We apply neutron
+inelastic scattering to investigate this coupling by measuring the spin-orbit
+transitions in both $\alpha$ and $\gamma$ polymorphs. We find the spin-exchange
+and anisotropy in monoclinic $\alpha$-CoV$_{2}$O$_{6}$ to be weak in comparison
+with the spin-orbit coupling $\lambda$ and estimate an upper limit of
+$|J/\lambda| \sim$ 0.05. However, the spin exchange is larger in the triclinic
+polymorph and we suggest the excitations are predominately two dimensional. The
+local compression of the octahedra surrounding the Co$^{2+}$ ion results in a
+direct coupling between higher energy orbital levels, the magnetic ground
+state, and elastic strain. CoV$_{2}$O$_{6}$ is therefore an example where the
+local distortion along with the spin-orbit coupling provides a means of
+intertwining structural and magnetic properties. We finish the paper by
+investigating the low-energy magnetic fluctuations within the ground state
+doublet and report a magnetic excitation that is independent of the local
+crystalline electric field. We characterize the temperature and momentum
+dependence of these excitations and discuss possible connections to the
+magnetization plateaus.",1512.05071v1
+2009-10-08,Three orbital model for the iron-based superconductors,"The theoretical need to study the properties of the Fe-based high-T_c
+superconductors with reliable many-body techniques requires us to determine the
+minimum number of orbital degrees of freedom that will capture the physics of
+these materials. While the shape of the Fermi surface (FS) obtained with the
+local density approximation (LDA) can be reproduced by a two-orbital model, it
+has been argued that the bands that cross the chemical potential result from
+the strong hybridization of three of the Fe 3d orbitals. For this reason, a
+three-orbital Hamiltonian obtained with the Slater-Koster formalism by
+considering the hybridization of the As p orbitals with the Fe d_xz,d_yz, and
+d_xy orbitals is discussed here. This model reproduces qualitatively the FS
+shape and orbital composition obtained by LDA calculations for undoped
+pnictides when four electrons per Fe are considered. Within a mean-field
+approximation, its magnetic and orbital properties in the undoped case are
+described. With increasing Coulomb repulsion, four regimes are obtained: (1)
+paramagnetic, (2) magnetic (pi,0) spin order, (3) the same (pi,0) spin order
+but now including orbital order, and finally (4) a magnetic and orbital ordered
+insulator. The spin-singlet pairing operators allowed by the lattice and
+orbital symmetries are also constructed. It is found that for pairs of
+electrons involving up to diagonal nearest-neighbors sites, the only fully
+gapped and purely intraband spin-singlet pairing operator is given by
+Delta(k)=f(k)\sum_{alpha} d_{k,alpha,up}d_{-k,alpha,down} with f(k)=1 or
+f(k)=cos(k_x)cos(k_y) which would arise only if the electrons in all different
+orbitals couple with equal strength to the source of pairing.",0910.1573v3
+2005-04-29,Strain-Induced Coupling of Spin Current to Nanomechanical Oscillations,"We propose a setup which allows to couple the electron spin degree of freedom
+to the mechanical motions of a nanomechanical system not involving any of the
+ferromagnetic components. The proposed method employs the strain induced
+spin-orbit interaction of electrons in narrow gap semiconductors. We have shown
+how this method can be used for detection and manipulation of the spin flow
+through a suspended rod in a nanomechanical device.",0504773v2
+2007-01-09,Electron scattering from a mesoscopic disk in Rashba system,"Electrons with spin-orbit coupling moving in mesoscopic structures can often
+exhibit local spin polarization. In this paper, we study the influence of the
+Rashba coupling on the scattering of two-dimensional electrons from a circular
+disk. It is observed that spin-polarized regions exist, even if the incident
+electrons are unpolarized. In addition to the distributions of charge and spin
+current in the near-field region, we also analyze the symmetry and the
+differential cross-section of the scattering.",0701162v1
+2006-11-18,Axial exchange currents and nucleon spin,"We calculate the hypercharge and flavor singlet axial couplings related to
+the spin of the nucleon in a constituent quark model. In addition to the
+standard one-body axial currents, the model includes two-body axial exchange
+currents. The latter are necessary to satisfy the Partial Conservation of Axial
+Current (PCAC) condition. For both axial couplings we find significant
+corrections to the standard quark model prediction. Exchange currents reduce
+the valence quark contribution to the nucleon spin and afford an interpretation
+of the missing nucleon spin as orbital angular momentum carried by nonvalence
+quark degrees of freedom.",0611248v1
+2021-10-13,Spin elastodynamic motive force,"The spin-motive force (SMF) in a simple ferromagnetic monolayer caused by a
+surface acoustic wave is studied theoretically via spin-vorticity coupling
+(SVC). The SMF has two mechanisms. The first is the SVC-driven SMF, which
+produces the first harmonic electromotive force, and the second is the
+interplay between the SVC and the magentoelastic coupling, which produces the
+d.c. and second harmonic electromotive forces. We show that these electric
+voltages induced by a Rayleigh-type surface acoustic wave can be detected in
+polycrystalline nickel. No sophisticated device structures, non-collinear
+magnetic structures, or strong spin-orbit materials are used in our approach.
+Consequently, it is intended to broaden the spectrum of SMF applications
+considerably.",2110.06552v1
+2024-03-15,General-order open-shell coupled-cluster method with partial spin adaptation I: formulations,"A general-order open-shell coupled-cluster method based on spatial orbitals
+is formulated. The method is an extension of the partial-spin adaptation (PSA)
+scheme from Janssen and Schaefer (Theor. Chim. Acta, 79, 1-42, 1991). By
+increasing the order of excitation operator and spin adaptation, the full
+configuration interaction (CI) limit is expected to be achieved. In the
+meanwhile, the advantages of spin-free approach in closed-shell systems:
+fourth-order truncation of the Baker-Campbell-Hausdorff (BCH) expansion and
+only $HT$-type connected terms are conserved.",2403.10128v1
+2002-04-04,Chirality driven anomalous Hall effect in weak coupling regime,"Anomalous Hall effect arising from non-trivial spin configuration (chirality)
+is studied based on the $s$-$d$ model. Considering a weak coupling case, the
+interaction is treated perturbatively. Scattering by normal impurities is
+included. Chirality is shown to drive locally Hall current and leads to overall
+Hall effect if there is a finite uniform chirality. This contribution is
+independent of the conventional spin-orbit contribution and shows distinct low
+temperature behavior. In mesoscopic spin glasses, chirality-induced anomalous
+Hall effect is expected below the spin-glass transition temperature.
+Measurement of Hall coefficient would be useful in experimentally confirming
+the chirality ordering.",0204096v1
+2010-08-11,"Chirality, charge and spin-density wave instabilities of a two-dimensional electron gas in the presence of Rashba spin-orbit coupling","We show that a result equivalent to Overhauser's famous Hartree-Fock
+instability theorem can be established for the case of a two-dimensional
+electron gas in the presence of Rashba spin-obit coupling. In this case it is
+the spatially homogeneous paramagnetic chiral ground state that is shown to be
+differentially unstable with respect to a certain class of distortions of the
+spin-density-wave and charge-density-wave type. The result holds for all
+densities. Basic properties of these inhomogeneous states are analyzed.",1008.1816v1
+2011-06-07,Goldstone Mode Relaxation in a Quantum Hall Ferromagnet due to Hyperfine Interaction with Nuclei,"Spin relaxation in quantum Hall ferromagnet regimes is studied. As the
+initial non-equilibrium state, a coherent deviation of the spin system from the
+${\vec B}$ direction is considered and the breakdown of this Goldstone-mode
+state due to hyperfine coupling to nuclei is analyzed. The relaxation occurring
+non-exponentially with time is studied in terms of annihilation processes in
+the ""Goldstone condensate"" formed by ""zero spin excitons"". The relaxation rate
+is calculated analytically even if the initial deviation is not small. This
+relaxation channel competes with the relaxation mechanisms due to spin-orbit
+coupling, and at strong magnetic fields it becomes dominating.",1106.1386v1
+2012-12-17,Quantum Anomalous Hall Effect in Kagome Ice,"An anomalous Hall insulator without magnetic long-range ordering is
+theoretically reported in the absence of the relativistic spin-orbit coupling.
+It is realized in itinerant electrons coupled with the Ising spins on a <111>
+kagome plane of pyrochlore spin ice in applied magnetic field. We find that the
+kagome-ice type local spin correlation in the magnetization plateau state opens
+a charge gap without magnetic ordering, which results in quantization of the
+Hall conductivity. By Monte Carlo simulation, we identify the anomalous Hall
+insulating region in the magnetic phase diagram, in addition to another
+anomalous Hall insulator in a fully-saturated state.",1212.3855v1
+1998-03-28,Anomalous Hall Effect in Double Exchange Magnets,"We investigate the possible origin of anomalous Hall effect in the CMR
+(colossal magnetoresistance) materials - the doped rare earth manganites -
+observed recently by Matl et al. It is demonstrated that the spin-orbit
+interaction in the double exchange model couples magnetization to the Berry
+phase associated with three dimensional spin textures and induces a non-zero
+average topological flux which in turn generates an anomalous contribution to
+transverse resistivity. The same effect, but involving the orbital Berry phase,
+occurs in the model with orbital degeneracy and Coulomb repulsion.",9803350v1
+1999-04-29,Spin and orbital ordering in double-layered manganites,"We study theoretically the phase diagram of the double-layered perovskite
+manganites taking into account the orbital degeneracy, the strong Coulombic
+repulsion, and the coupling with the lattice deformation. Observed spin
+structural changes as the increased doping are explained in terms of the
+orbital ordering and the bond-length dependence of the hopping integral along
+$c$-axis. Temperature dependence of the neutron diffraction peak corresponding
+to the canting structure is also explained. Comparison with the 3D cubic system
+is made.",9904427v1
+2002-07-28,Anisotropy of Mott-Hubbard gap transitions due to spin and orbital ordering in LaVO3 and YVO3,"Anisotropic optical spectra coupled with antiferromagnetic spin ordering (SO)
+and orbital ordering (OO) have been investigated for single crystals of
+LaVO_{3} and YVO_{3}. The orbital-dependent Mott-Hubbard gap transitions are
+observed around 2 eV. The transitions composed of the two peaks show distinct
+anisotropy and selection rules, reflecting the respective SO and OO patterns.
+The temperature dependence of the anisotropic transitions clearly indicates the
+SO/OO correlation and the evolution of the order parameters.",0207664v1
+2005-10-05,Orbital Polarization in Itinerant Magnets,"We propose a parameter-free scheme of calculation of the orbital polarization
+(OP) in metals, which starts with the strong-coupling limit for the screened
+Coulomb interactions in the random-phase approximation (RPA). For itinerant
+magnets, RPA can be further improved by restoring the spin polarization of the
+local-spin-density approximation (LSDA) through the local-field corrections.
+The OP is then computed in the static GW approach, which systematically
+improves the orbital magnetization and the magnetic anisotropy energies in
+transition-metal and actinide compounds.",0510100v1
+2005-11-30,Evidence for electronic phase separation between orbital orderings in SmVO3,"We report evidence for phase coexistence of orbital orderings of different
+symmetry in SmVO$_3$ by high resolution X-Ray powder diffraction. The phase
+coexistence is triggered by an antiferromagnetic ordering of the vanadium spins
+near 130K, below an initial orbital ordering near 200K. The phase coexistence
+is the result of the intermediate ionic size of samarium coupled to exchange
+striction at the vanadium spin ordering.",0511744v1
+2018-04-12,Spinon-orbiton repulsion and attraction mediated by Hund's rule,"We study the impact of Hund's-rule coupling on orbital excitations, as e.g.
+measured in inelastic resonant x-ray scattering. We find that the
+interpretation in terms of spin-orbit separation, which has been derived for
+one-dimensional systems without Hund's rule, remains robust in its presence.
+Depending on whether or not the orbital excitation includes a spin excitation,
+Hund's rule leads to an attractive or repulsive interaction between spinon and
+orbiton. Attraction and repulsion leave clear signatures through a transfer of
+spectral weight to the lower resp. upper edge of the spectrum.",1804.04462v1
+2000-10-09,Almost Non-Magnetic Ground State of the V4+ Ion: The case of BaVS3,"We have shown that the V4+ ion with 1 d electron can have almost non-magnetic
+ground state under the action of the octahedral crystal field in the presence
+of the spin-orbit coupling and off-cubic distortions. Such the situation occurs
+in the hexagonal BaVS3. The fine discrete electronic structure with the
+weakly-magnetic Kramers-doublet ground state is the reason for anomalous
+properties of BaVS3.
+  Keywords: crystal-field, spin-orbit, orbital moment. PACS: 71.70.E, 75.10.D",0010135v1
+2007-06-22,Orbital and Spin Excitations in Cobalt Oxide,"By means of neutron scattering we have determined new branches of magnetic
+excitations in orbitally active CoO (TN=290 K) up to 15 THz and for
+temperatures from 6 K to 450 K. Data were taken in the (111) direction in six
+single-crystal zones. From the dependence on temperature and Q we have
+identified several branches of magnetic excitation. We describe a model for the
+coupled orbital and spin states of Co2+ subject to a crystal field and
+tetragonal distortion.",0706.3345v1
+2020-07-07,Twisting Neutral Particles with Electric Fields,"We demonstrate that spin-orbit coupled states are generated in neutral
+magnetic spin 1/2 particles travelling through an electric field. The
+quantization axis of the orbital angular momentum is parallel to the electric
+field, hence both longitudinal and transverse orbital angular momentum can be
+created. Furthermore we show that the total angular momentum of the particle is
+conserved. Finally we propose a neutron optical experiment to measure the
+transverse effect.",2007.03345v3
+2014-09-22,Phase separation in a spin-orbit coupled Bose-Einstein condensate,"We study a spin-orbit (SO) coupled hyperfine spin-1 Bose-Einstein condensate
+(BEC) in a quasi-one-dimensional trap. For a SO-coupled BEC in a
+one-dimensional box, we show that in the absence of the Rabi term, any non-zero
+value of SO coupling will result in a phase separation among the components for
+a ferromagnetic BEC, like $^{87}$Rb. On the other hand, SO coupling favors
+miscibility in a polar BEC, like $^{23}$Na. In the presence of a harmonic trap,
+which favors miscibility, a ferromagnetic BEC phase separates, provided the
+SO-coupling strength and number of atoms are greater than some critical value.
+The Rabi term favors miscibility irrespective of the nature of the spin
+interaction: ferromagnetic or polar.",1409.6211v2
+2020-12-01,"Multi-ring, stripe, and super-lattice solitons in a spin-orbit coupled spin-1 condensate","We demonstrate exotic stable quasi-two-dimensional solitons in a Rashba or a
+Dresselhaus spin-orbit (SO) coupled hyperfine spin-1 ($F=1$) trap-less
+antiferromagnetic Bose-Einstein condensate using the mean-field
+Gross-Pitaevskii equation. For weak SO coupling, the solitons are of the
+$(-1,0,+1)$ or $(+1,0,-1)$ type with intrinsic vorticity, for Rashba or
+Dresselhaus SO coupling, where the numbers in the parentheses denote angular
+momentum in spin components $F_z= +1,0,-1$, respectively. For intermediate SO
+coupling, the solitons have multi-ring structure maintaining the
+above-mentioned vortices in respective components. For larger SO coupling,
+superlattice solitons with a square-lattice structure in total density are
+found in addition to stripe solitons with stripe pattern in component densities
+with no periodic modulation in total density.",2012.00872v2
+2004-01-07,Spin-triplet s-wave local pairing induced by Hund's rule coupling,"We show within the dynamical mean field theory that local multiplet
+interactions such as Hund's rule coupling produce local pairing
+superconductivity in the strongly correlated regime. Spin-triplet
+superconductivity driven by the Hund's rule coupling emerges from the pairing
+mediated by local fluctuations in pair exchange. In contrast to the
+conventional spin-triplet theories, the local orbital degrees of freedom has
+the anti-symmetric part of the exchange symmetry, leaving the spatial part as
+fully gapped and symmetric s-wave.",0401104v1
+2016-12-11,Electronic origin of spin-phonon coupling effect in transition-metal perovskites,"By applying Wannier-based extended Kugel-Khomskii model, we carry out
+first-principles calculations and electronic structure analysis to understand
+the spin-phonon coupling effect in transition-metal perovskites. We demonstrate
+the successful application of our approach to SrMnO$_3$ and BiFeO$_3$. We show
+that both the electron orbitals under crystal field splitting and the
+electronic configuration should be taken into account in order to understand
+the large variances of spin-phonon coupling effects among various phonon modes
+as well as in different materials.",1612.03436v1
+2021-05-21,OpenMP solver for rotating spin-one spin-orbit- and Rabi-coupled Bose-Einstein condensates,"We present OpenMP version of a Fortran program for solving the
+Gross-Pitaevskii equation for a harmonically trapped three-component rotating
+spin-1 spinor Bose-Einstein condensate (BEC) in two spatial dimensions with or
+without spin-orbit (SO) and Rabi couplings. The program uses either Rashba or
+Dresselhaus SO coupling. We use the split-step Crank-Nicolson discretization
+scheme for imaginary- and real-time propagation to calculate stationary states
+and BEC dynamics, respectively.",2105.10517v1
+2009-05-15,Polarized DIS in N=4 SYM: Where is spin at strong coupling?,"Using the AdS/CFT correspondence, we calculate the polarized structure
+functions in strongly coupled N=4 supersymmetric Yang-Mills theory deformed in
+the infrared. We find that the flavor singlet contribution to the g_1 structure
+function is vanishingly small, while the flavor non-singlet contribution shows
+the Regge behavior at small-x with an intercept slightly less than 1. We
+explicitly check that the latter satisfies the moment sum rule. We discuss the
+`spin crisis' problem and suggest that at strong coupling the spin of a hadron
+entirely comes from the orbital angular momentum.",0905.2493v1
+2012-05-15,Magnetic softness in iron-based superconductors,"We examine the relevance of several major material-dependent parameters to
+the magnetic softness in iron-base superconductors by first-principles
+electronic structure analysis of their parent compounds. The results are
+explained in the spin-fermion model where localized spins and orbitally
+degenerate itinerant electrons coexist and are coupled by Hund's rule coupling.
+We found that the difference in the strength of the Hund's rule coupling term
+is the major material-dependent microscopic parameter for determining the
+ground-state spin pattern. The magnetic softness in iron-based superconductors
+is essentially driven by the competition between the double-exchange
+ferromagnetism and the superexchange antiferromagnetism.",1205.3509v1
+2021-08-07,Dynamic electron-phonon and spin-phonon interactions due to inertia,"THz radiation allows for the controlled excitation of vibrational modes in
+molecules and crystals. We show that the circular motion of ions introduces
+inertial effects on electrons. In analogy to the classical Coriolis and
+centrifugal forces, these effects are the spin-rotation coupling, the
+centrifugal field coupling, the centrifugal spin-orbit coupling, and the
+centrifugal redshift. Depending on the phonon decay, these effects persist for
+various picoseconds after excitation. Potential boosting of the effects would
+make it a promising platform for vibration-based control of localized quantum
+states or chemical reaction barriers.",2108.03473v2
+2011-02-19,Realistic Rashba and Dressehaus spin-orbit coupling for neutral atoms,"We describe a new class of atom-laser coupling schemes which lead to
+spin-orbit coupled Hamiltonians for ultra-cold neutral atoms. By properly
+setting the optical phases, a pair of degenerate pseudospin states emerge as
+the lowest energy states in the spectrum, and are thus immune to collisionally
+induced decay. These schemes use $N$ cyclically coupled ground or metastable
+internal states. We specialize to two situations: a three level case giving
+fixed Rashba coupling, and a four-level case that adds a controllable
+Dresselhaus contribution. We describe an implementation of the four level
+scheme for $\Rb87$ and analyze the sensitivity of our approach to realistic
+experimental limitations and imperfections. Lastly, we argue that no laser
+coupling scheme can give pure Rashba or Dresselhaus coupling: akin to condensed
+matter systems, higher order terms spoil the symmetry of these couplings.
+However, for sufficiently intense laser fields the continuous rotational
+symmetry approximately holds, making the Rashba Hamiltonian applicable for cold
+atoms.",1102.3945v2
+2014-11-27,Efimov physics and universal trimer in spin-orbit coupled ultracold atomic mixtures,"We study the two-body and three-body bound states in ultracold atomic
+mixtures with one of the atoms subjected to an isotropic spin-orbit (SO)
+coupling. We consider a system of two identical fermions interacting with one
+SO coupled atom. It is found that there can exist two types of three-body bound
+states, Efimov trimers and universal trimers. The Efimov trimers are
+energetically less favored by the SO coupling, which will finally merge into
+the atom-dimer threshold as increasing the SO coupling strength. Nevertheless,
+these trimers exhibit a new kind of discrete scaling law incorporating the SO
+coupling effect. On the other hand, the universal trimers are more favored by
+the SO coupling. They can be induced at negative s-wave scattering lengths and
+with smaller mass ratios than those without SO coupling. These results are
+obtained by both the Born-Oppenheimer approximation and exact solutions from
+three-body equations.",1411.7488v1
+2013-09-04,"Excitons in quantum dot molecules: Coulomb coupling, spin-orbit effects and phonon-induced line broadening","Excitonic states and the line shape of optical transitions in coupled quantum
+dots (quantum dot molecules) are studied theoretically. For a pair of
+electrically tunable, vertically aligned quantum dots we investigate the
+coupling between spatially direct and indirect excitons caused by different
+mechanisms such as tunnel coupling, Coulomb coupling, coupling due to the
+spin-orbit interaction and coupling induced by a structural asymmetry. The
+peculiarities of the different types of couplings are reflected in the
+appearance of either crossings or avoided crossings between direct and indirect
+excitons, the latter ones being directly visible in the absorption spectrum. We
+analyze the influence of the phonon environment on the spectrum by calculating
+the line shape of the various optical transitions including contributions due
+to both pure dephasing and phonon-induced transitions between different exciton
+states. The line width enhancement due to phonon-induced transitions is
+particularly pronounced in the region of an anticrossing and it strongly
+depends on the energy splitting between the two exciton branches.",1309.1032v2
+2015-06-15,Hole spin relaxation in bilayer WSe$_2$,"We investigate the hole spin relaxation due to the Rashba spin-orbit coupling
+induced by an external perpendicular electric field in bilayer WSe$_2$. The
+Rashba spin-orbit coupling coefficients in bilayer WSe$_2$ are constructed from
+the corresponding monolayer ones. In contrast to monolayer WSe$_2$, the
+out-of-plane component of the bilayer Rashba spin-orbit coupling acts as a
+Zeeman-like field with opposite directions but identical values in the two
+valleys. For in-plane spins, this Zeeman-like field, together with the
+intervalley hole-phonon scattering, opens an intervalley spin relaxation
+channel, which is found to dominate the in-plane spin relaxation in bilayer
+WSe$_2$ even at low temperature. For out-of-plane spins, this Zeeman-like field
+is superimposed by the identical Hartree-Fock effective magnetic fields in the
+two valleys, and hence different total effective magnetic fields between two
+valleys are obtained. Owing to the large difference of the total fields at
+large spin polarization, different out-of-plane spin relaxation times in the
+two valleys are obtained when the intervalley hole-phonon scattering is weak at
+low temperature and low hole density. This difference in the spin relaxation
+times can be suppressed by enhancing the intervalley hole-phonon scattering
+through increasing temperature or hole density. Moreover, at large spin
+polarization and low temperature, due to the weak intravalley hole-phonon
+scattering but relatively strong hole-hole Coulomb scattering, the fast spin
+precessions are found to result in a quasi hot-hole Fermi distribution
+characterized by an effective hot-hole temperature larger than the temperature,
+which also enhances the intervalley scattering. During this process, it is
+interesting to discover that the initially equal hole densities in the two
+valleys are broken in the temporal evolution, and a valley polarization is
+built up. ....",1506.04482v1
+2015-11-17,"Spin Dynamics of Complex Oxides, Bismuth-Antimony Alloys, and Bismuth Chalcogenides","This thesis predicts that two types of material families could be a solution
+to the challenges in spintronics: complex oxides and bismuth based materials.
+We derive a general approach for constructing an effective spin-orbit
+Hamiltonian, which applies to all nonmagnetic materials. We also verify this
+formalism through comparisons with other approaches for III-V semiconductors.
+Its general applicability is illustrated by deriving the spin-orbit interaction
+and predicting spin lifetimes for strained SrTiO$_3$ and a two-dimensional
+electron gas (such as at the LaAlO$_3$/SrTiO$_3$ interface). Our results
+suggest robust spin coherence and spin transport properties in SrTiO$_3$
+related materials. In the second part, we calculate intrinsic spin Hall
+conductivities for Bi$_{1-x}$Sb$_x$ semimetals with strong spin-orbit
+couplings, from the Kubo formula and using Berry curvatures evaluated from a
+tight-binding Hamiltonian. Nearly crossing bands with strong spin-orbit
+interaction generate giant spin Hall conductivities in these materials, ranging
+from 474 ($\hbar/e)( \Omega^{-1}cm^{-1}$) for bismuth to 96($\hbar/e)(
+\Omega^{-1}cm^{-1}$) for antimony; the value for bismuth is more than twice
+that of platinum. The large spin Hall conductivities persist for alloy
+compositions corresponding to a three-dimensional topological insulator state,
+such as Bi$_{0.83}$Sb$_{0.17}$. The spin Hall conductivity could be changed by
+a factor of 5 for doped Bi, or for Bi$_{0.83}$Sb$_{0.17}$, by changing the
+chemical potential, suggesting the potential for doping or voltage tuned spin
+Hall current. We also calculate intrinsic spin Hall conductivities of
+Bi$_2$Se$_3$ and Bi$_2$Te$_3$ topological insulators from an effective
+tight-binding Hamiltonian. We conclude that bismuth-antimony alloys and bismuth
+chalcogenides are primary candidates for efficiently generating spin currents
+through the spin Hall effect.",1511.05276v1
+2001-05-03,Ballistic spin-polarized transport and Rashba spin precession in semiconductor nanowires,"We present numerical calculations of the ballistic spin-transport properties
+of quasi-one-dimensional wires in the presence of the spin-orbit (Rashba)
+interaction. A tight-binding analog of the Rashba Hamiltonian which models the
+Rashba effect is used. By varying the robustness of the Rashba coupling and the
+width of the wire, weak and strong coupling regimes are identified. Perfect
+electron spin-modulation is found for the former regime, regardless of the
+incident Fermi energy and mode number. In the latter however, the
+spin-conductance has a strong energy dependence due to a nontrivial subband
+intermixing induced by the strong Rashba coupling. This would imply a strong
+suppression of the spin-modulation at higher temperatures and source-drain
+voltages. The results may be of relevance for the implementation of
+quasi-one-dimensional spin transistor devices.",0105049v1
+2007-03-01,Driven dissipative dynamics of spins in quantum dots,"We have studied the dissipative dynamics of a driven electronic spin trapped
+in a quantum dot. We consider the dissipative mechanism as due to the indirect
+coupling of the electronic spin to acoustic phonons via the
+spin-orbit/electron-phonon couplings. Using an effective spectral function of
+the dissipative phonon bath, we evaluated the expectation values of the spin
+components through the Bloch-Redfield theory. We show that due to a sharp bath
+resonance present in the effective spectral function, with typical energy much
+smaller than the electronic confinement energy, the dissipative spin has a rich
+dynamical behavior that helps us to determine some features of the spin-bath
+coupling. We also quantify the effects produced by the sharp bath resonance,
+and thus indicate the best regimes of operation in order to achieve the longest
+relaxation times for the spin.",0703009v1
+2018-12-03,Two-dimensional spin-valley-coupled Dirac semimetals in functionalized SbAs monolayers,"In the presence of spin-orbit coupling (SOC), achieving both spin and valley
+polarized Dirac state is significant to promote the fantastic integration of
+Dirac physics, spintronics and valleytronics. Based on ab initio calculations,
+here we demonstrate that a class of spin-valley-coupled Dirac semimetals
+(svc-DSMs) in the functionalized SbAs monolayers (MLs) can host such desired
+state. Distinguished from the graphene-like 2D Dirac materials, the Dirac cones
+in svc-DSMs hold giant spin-splitting induced by strong SOC under inversion
+symmetry breaking. In the 2.3% strained SbAsH2 ML, the Dirac fermions in
+inequivalent valleys have opposite Berry curvature and spin moment, giving rise
+to Dirac spin-valley Hall effect with constant spin Hall conductivity as well
+as massless and dissipationless transport. Topological analysis reveals that
+the svc-DSM emerges at the boundary between trivial and 2D topological
+insulators, which provides a promising platform for realizing the flexible and
+controllable tuning among different quantum states.",1812.00867v1
+2021-10-11,Monte Carlo simulations of spin transport in nanoscale In$_{0.7}$Ga$_{0.3}$As transistors: Temperature and size effects,"Spin-based metal-oxide-semiconductor field-effect transistors (MOSFET) with a
+high-mobility III-V channel are studied using self-consistent quantum corrected
+ensemble Monte Carlo device simulations of charge and spin transport. The
+simulations including spin-orbit coupling mechanisms (Dresselhaus and Rashba
+coupling) examine the electron spin transport in the 25 nm gate length
+In$_{0.7}$Ga$_{0.3}$As MOSFET. The transistor lateral dimensions (the gate
+length, the source-to-gate, and the gate-to-drain spacers) are increased to
+investigate the spin-dependent drain current modulation induced by the gate
+from room temperature of 300 K down to 77 K. This modulation increases with
+increasing temperature due to increased Rashba coupling. Finally, an increase
+of up to 20 nm in the gate length, source-to-gate, or the gate-to-drain spacers
+increases the spin polarization and enhances the spin-dependent drain current
+modulation at the drain due to polarization-refocusing effects.",2110.05366v2
+2022-07-14,Dzyaloshinskii-Moriya spin density by skew scattering,"Anisotropic exchange couplings, such as the Dzyaloshinskii-Moriya interaction
+(DMI), have played a vital role in the formation and dynamics of spin textures.
+This work predicts an anisotropic conduction electron spin density in metals
+with heavy magnetic impurities. The polarization of this
+$Dzyaloshinskii$-$Moriya$ $spin$ $density$ (DM-SD) is not collinear to the
+localized magnetic moments but rotated by the spin-dependent skew scattering of
+heavy atoms. The DM-SD induces the DMI between magnetic moments in metals and,
+therefore, it is the anisotropic extension of the
+Rutherman-Kittel-Kasuya-Yoshida spin density. Our model consists of two
+localized magnetic moments, one with a large spin-orbit coupling (a lanthanide
+or rare earth), in a free electron gas. The lanthanide spin controls the DM-SD
+strength and polarization, promising a flexible control mechanism for
+anisotropic couplings.",2207.06842v2
+2009-09-22,Spin Hall and longitudinal conductivity of a conserved spin current in two dimensional heavy-hole gases,"The spin Hall and longitudinal conductivity of a 2D heavy-hole gas with {\it
+k}-cubic Rashba and Dresselhaus spin-orbit interaction is studied in the ac
+frequency domain. Using Kubo linear-response theory and a recently proposed
+definition for the (conserved) spin current operator suitable for spin-3/2
+holes, it is shown that the spin conductivity tensor exhibit very
+distinguishable features from those obtained with the standard definition of
+the spin current. This is due to a significant contribution of the spin-torque
+term arisen from the alternative definition of spin current which strongly
+affects the magnitude and the sign of the dynamic spin current. In the dc (free
+of disorder) limit, the spin Hall conductivity for only (or dominant) {\it
+k}-cubic Rashba coupling is $\sigma^{s,z}_{xy}(0)=-9e/8\pi$, whereas
+$\sigma^{s,z}_{xy}(0)=-3e/8\pi$ for only (or dominant) {\it k}-cubic
+Dresselhaus coupling. Such anisotropic response is understood in terms of the
+absence of mapping the {\it k}-cubic Rashba $\leftrightarrow$ Dresselhaus
+Hamiltonians. This asymmetry is also responsible for the non-vanishing dc spin
+Hall conductivity ($\sigma^{s,z}_{xy}(0)=-6e/8\pi$) when the Rashba and
+Dresselhaus parameters have the same strength, in contrast with its
+corresponding case for electrons. These results are of relevance to validate
+the alternative definition of spin-current through measurements in the
+frequency domain of the spin accumulation and/or spin currents in 2D hole
+gases.",0909.4045v3
+2011-04-23,Orbital density wave induced by electron-lattice coupling in orthorhombic iron pnictides,"In this paper we explore the magnetic and orbital properties closely related
+to a tetragonal-orthorhombic structural phase transition in iron pnictides
+based on both two- and five-orbital Hubbard models. The electron-lattice
+coupling, which interplays with electronic interaction, is self-consistently
+treated. Our results reveal that the orbital polarization stabilizes the spin
+density wave (SDW) order in both tetragonal and orthorhombic phases. However,
+the ferro-orbital density wave (F-ODW) only occurs in the orthorhombic phase
+rather than in the tetragonal one. Magnetic moments of Fe are small in the
+intermediate Coulomb interaction region for the striped antiferromangnetic
+phase in the realistic five orbital model. The anisotropic Fermi surface in the
+SDW/ODW orthorhombic phase is well in agreement with the recent angle-resolved
+photoemission spectroscopy experiments. These results suggest a scenario that
+the magnetic phase transition is driven by the ODW order mainly arising from
+the electron-lattice coupling.",1104.4575v1
+2023-05-23,Metamagnetic transition in the two $f$ orbitals Kondo lattice model,"In this work, we study the effects of a transverse magnetic field in a Kondo
+lattice model with two $f$ orbitals interacting with the conduction electrons.
+The $f$ electrons that are present on the same site interact through Hund's
+coupling, while on neighboring sites they interact through intersite exchange.
+We consider here that part of $f$ electrons are localized (orbital 1) while
+another part (orbital 2) are delocalized, as it is frequent in uranium systems.
+Then, only electrons in the localized orbital 1 interact through exchange
+interaction with the neighboring ones, while electrons in orbital 2 are coupled
+with conduction electrons through a Kondo interaction. We obtain a solution
+where ferromagnetism and Kondo effect coexist for small values of an applied
+transverse magnetic field for $T\rightarrow0$. Increasing the transverse field,
+two situations can be obtained when Kondo coupling vanishes: first, a
+metamagnetic transition occurs just before or at the same time of the fully
+polarized state, and second, a metamagnetic transition occurs when the spins
+are already pointing out along the magnetic field.",2305.13559v1
+2006-05-09,Circular orbits and spin in black-hole initial data,"The construction of initial data for black-hole binaries usually involves the
+choice of free parameters that define the spins of the black holes and
+essentially the eccentricity of the orbit. Such parameters must be chosen
+carefully to yield initial data with the desired physical properties. In this
+paper, we examine these choices in detail for the quasiequilibrium method
+coupled to apparent-horizon/quasiequilibrium boundary conditions. First, we
+compare two independent criteria for choosing the orbital frequency, the
+""Komar-mass condition"" and the ""effective-potential method,"" and find excellent
+agreement. Second, we implement quasi-local measures of the spin of the
+individual holes, calibrate these with corotating binaries, and revisit the
+construction of non-spinning black hole binaries. Higher-order effects, beyond
+those considered in earlier work, turn out to be important. Without those,
+supposedly non-spinning black holes have appreciable quasi-local spin;
+furthermore, the Komar-mass condition and effective potential method agree only
+when these higher-order effects are taken into account. We compute a new
+sequence of quasi-circular orbits for non-spinning black-hole binaries, and
+determine the innermost stable circular orbit of this sequence.",0605053v3
+2023-08-29,RKKY interaction in triplet superconductors: Dzyaloshinskii-Moriya-type interaction mediated by spin-polarized Cooper pairs,"The Ruderman--Kittel--Kasuya--Yosida (RKKY) interaction governs the coupling
+between localized spins and is strongly affected by the environment in which
+these spins reside. In superconductors, this interaction becomes long-ranged
+and provides information about the orbital symmetry of the superconducting
+order parameter. In this work, we consider the RKKY interaction between
+localized spins mediated by $p$-wave triplet superconductors. In contrast to
+the well-studied RKKY interaction in $d$-wave superconductors, we find that the
+spin of the Cooper pair in a triplet state also modulates the spin--spin
+coupling. We consider several different types of $p$-wave triplet states, and
+find that the form of the RKKY interaction changes significantly with the
+symmetries of the order parameter. For non-unitary superconducting states, two
+new terms appear in the RKKY interaction: a background spin magnetization
+coupling to the individual spins and, more interestingly, an effective
+Dzyaloshinskii--Moriya term. The latter term oscillates with the separation
+distance between the impurity spins. Finally, we find that the finite spin
+expectation value in non-unitary superconductors in concert with the
+conventional RKKY interaction can lead to non-collinear magnetic ground states
+even when the Dzyaloshinskii--Moriya term is negligible. The RKKY interaction
+in $p$-wave triplet superconductors thus offers a way to achieve new ground
+state spin configurations of impurity spins and simultaneously provides
+information about the underlying superconducting state.",2308.15523v2
+2015-06-02,Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS_2 and WS_2,"The recently-discovered monolayer transition metal dichalcogenides (TMDCs)
+provide a fertile playground to explore new coupled spin-valley physics.
+Although robust spin and valley degrees of freedom are inferred from polarized
+photoluminescence (PL) experiments, PL timescales are necessarily constrained
+by short-lived (3-100ps) electron-hole recombination. Direct probes of
+spin/valley polarization dynamics of resident carriers in electron (or hole)
+doped TMDCs, which may persist long after recombination ceases, are at an early
+stage. Here we directly measure the coupled spin-valley dynamics in
+electron-doped MoS_2 and WS_2 monolayers using optical Kerr spectroscopy, and
+unambiguously reveal very long electron spin lifetimes exceeding 3ns at 5K (2-3
+orders of magnitude longer than typical exciton recombination times). In
+contrast with conventional III-V or II-VI semiconductors, spin relaxation
+accelerates rapidly in small transverse magnetic fields. Supported by a model
+of coupled spin-valley dynamics, these results indicate a novel mechanism of
+itinerant electron spin dephasing in the rapidly-fluctuating internal
+spin-orbit field in TMDCs, driven by fast intervalley scattering. Additionally,
+a long-lived spin coherence is observed at lower energies, commensurate with
+localized states. These studies provide crucial insight into the physics
+underpinning spin and valley dynamics of resident electrons in atomically-thin
+TMDCs.",1506.00996v1
+2017-05-22,Quantum Transport in Weyl Semimetal Thin Films in the Presence of Spin-Orbit Coupled Impurities,"Topological semimetals have been at the forefront of experimental and
+theoretical attention in condensed matter physics. Among these, recently
+discovered Weyl semimetals have a dispersion described by a three-dimensional
+Dirac cone, which is at the root of exotic physics such as the chiral anomaly
+in magnetotransport. In a time reversal symmetric (TRS) Weyl semimetal film,
+the confinement gap gives the quasiparticles a mass, while TRS is preserved by
+having an even number of valleys with opposite masses. The film can be tuned
+through a topological phase transition by a gate electric field. In this work,
+we present a theoretical study of the quantum corrections to the conductivity
+of a topological semimetal thin film, which is governed by the complex
+interplay of the chiral band structure, mass term, and scalar and spin-orbit
+scattering. We study scalar and spin-orbit scattering mechanisms on the same
+footing, demonstrating that they have a strong qualitative and quantitative
+impact on the conductivity correction. We show that, due to the spin structure
+of the matrix Green's functions, terms linear in the extrinsic spin-orbit
+scattering are present in the Bloch and momentum relaxation times, whereas
+previous works had identified corrections starting from the second order. In
+the limit of small quasiparticle mass, the terms linear in the impurity
+spin-orbit coupling lead to a potentially observable density dependence in the
+weak antilocalization correction. Moreover, when the mass term is around 30
+percent of the linear Dirac terms, the system is in the unitary symmetry class
+with zero quantum correction and switching the extrinsic spin-orbit scattering
+drives the system to the weak antilocalization. We discuss the crossover
+between the weak localization and weak antilocalization regimes in terms of the
+singlet and triplet Cooperon channels, tuning the spin-orbit scattering
+strength.",1705.07612v1
+2012-07-24,Sequential Landau-Zener transitions in spin-orbit coupled systems,"We investigate the Landau-Zener (LZ) process in spin-orbit coupled systems of
+single or multiple two-level (spin-$\frac{1}{2}$) particles. The coupling
+between internal spin states and external vibrational states, a simple
+spin-orbit coupling (SOC), is induced by applying a spin-dependent harmonic
+trap. Because of the SOC, the single-particle energy-level structures are
+modified by the Franck-Condon (FC) effects, in which some avoided
+energy-level-crossings (ELCs) are almost closed and some ELCs are opened. The
+close of avoided ELCs and the open of ELCs result in the FC blockade and the
+vibrational transitions, respectively. For a given low sweeping rate, the
+sequential LZ transitions of ladder-like population transition can be induced
+by strong SOC. We derive an analytical formula for the final population which
+is well consistent with the numerical results. For a given strong SOC, the
+sequential LZ transitions are submerged in the non-adiabatic transitions if the
+sweeping rate is sufficiently high. Further, we study LZ transitions of
+multiple interacting two-level Bose particles in a spin-dependent harmonic
+trap. The interplay between the SOC effects and the interaction effects is
+explored.",1207.5585v4
+2014-05-18,Effect of disorder in the transition from topological insulator to valley-spin polarized state in silicene and Germanene,"We start with the silicene or germanene single-particle Hamiltonian in
+buckled 2D hexagonal lattices expressed in terms of Dirac matrices in the Weyl
+basis. The Hamiltonian of these systems comprises of the Dirac kinetic energy,
+a mass gap term, and the spin-orbit coupling. The second term breaks the
+sub-lattice symmetry of the honey-comb lattice structure and generates a gap.
+The buckled structure generates a staggered sub-lattice potential between
+silicon atoms at A sites and B sites for an applied electric field
+perpendicular to its plane. Tuning of the electric field, allows for rich
+behavior varying from a topological insulator to a band insulator with a valley
+spin-polarized metal at a critical value in between. Thus, the mobile electrons
+in silicene or germanene are coupled differently compared to graphene to an
+external electric field. Our preliminary investigation have shown that, as long
+as the non-magnetic impurity scattering strength is moderate, i.e. the strength
+is of the same order as the intrinsic spin-orbit coupling of 4 meV, valley-spin
+polarized metal phase is protected. The effective ""two-component Dirac physics""
+remains valid in this phase. The increase in the electric field beyond the
+critical value leads to the valley magnetic moment reversal. The enhancement in
+the impurity scattering strength, however, leads to the disappearance of the
+polarized metal phase due to accentuated intra- and inter-valley scattering
+processes. This disappearance does not occur due to the increase in Rashba
+spin-orbit coupling effect.",1405.4521v1
+2020-05-07,Strong enhancement of magnetic susceptibility induced by spin-nematic fluctuations in an excitonic insulating system with spin-orbit coupling,"Effects of the spin-orbit coupling (SOC) and magnetic field on excitonic
+insulating (EI) states are investigated. We introduce the two-orbital Hubbard
+model with the crystalline field splitting, which is a minimal model for
+discussing the exciton condensation in strongly correlated electron systems,
+and analyze its effective Hamiltonian in the strong correlation limit by using
+the mean-field theory. In the absence of the SOC and magnetic field, the ground
+state changes from the nonmagnetic band-insulating state to the EI state by
+increasing the Hund coupling. In an applied magnetic field, the magnetic moment
+appears in the EI state, which is continuously connected to the forced
+ferromagnetic state. On the other hand, in the presence of the SOC, they are
+separated by a phase boundary. We find that the magnetic susceptibility is
+strongly enhanced in the EI phase near the boundary with a small SOC. This
+peculiar behavior is attributed to the low-energy fluctuation of the spin
+nematicity inherent in the high-spin local state stabilized by the Hund
+coupling. The present study not only reveals the impact of the SOC for the EI
+state but also sheds light on the role of quantum fluctuations of the spin
+nematicity for the EI state.",2005.03290v1
+2023-01-13,Search for large topological gaps in atomic spin chains on proximitized superconducting heavy metal layers,"One-dimensional systems comprising s-wave superconductivity with meticulously
+tuned magnetism and spin-orbit coupling can realize topologically gapped
+superconductors hosting Majorana edge modes whose stability is determined by
+the gap's size. The ongoing quest for larger topological gaps evolved into a
+material science issue. However, for atomic spin chains on superconductor
+surfaces, the effect of the substrate's spin-orbit coupling on the system's
+topological gap size is largely unexplored. Here, we introduce an atomic layer
+of the heavy metal Au on Nb(110) which combines strong spin-orbit coupling and
+a large superconducting gap with a high crystallographic quality enabling the
+assembly of defect-free Fe chains using a scanning tunneling microscope tip.
+Scanning tunneling spectroscopy experiments and density functional theory
+calculations reveal ferromagnetic coupling and ungapped YSR bands in the chain
+despite of the heavy substrate. By artificially imposing a spin spiral state
+our calculations indicate a minigap opening and zero-energy edge state
+formation. The presented methodology paves the way towards a material screening
+of heavy metal layers on elemental superconductors for ideal systems hosting
+Majorana edge modes protected by large topological gaps.",2301.05622v1
+2018-08-02,Generation of pure superconducting spin current in magnetic heterostructures via non-locally induced magnetism due to Landau Fermi-liquid effects,"We propose a mechanism for the generation of pure superconducting
+spin-current carried by equal-spin triplet Cooper pairs in a superconductor (S)
+sandwiched between a ferromagnet (F) and a normal metal (N$_{\rm so}$) with
+intrinsic spin-orbit coupling. We show that in the presence of Landau
+Fermi-liquid interactions the superconducting proximity effect can induce
+non-locally a ferromagnetic exchange field in the normal layer, which
+disappears above the superconducting transition temperature of the structure.
+The internal Landau Fermi-liquid exchange field leads to the onset of a spin
+supercurrent associated with the generation of long-range spin-triplet
+superconducting correlations in the trilayer. We demonstrate that the magnitude
+of the spin supercurrent as well as the induced magnetic order in the N$_{\rm
+so}$ layer depends critically on the superconducting proximity effect between
+the S layer and the F and N$_{\rm so}$ layers and the magnitude of the relevant
+Landau Fermi-liquid interaction parameter. We investigate the effect of spin
+flip processes on this mechanism. Our results demonstrate the crucial role of
+Landau Fermi-liquid interaction in combination with spin-orbit coupling for the
+creation of spin supercurrent in superconducting spintronics, and give a
+possible explanation of a recent experiment utilizing spin-pumping via
+ferromagnetic resonance [Jeon $\it{ et}$ $\it{al.}$, Nat. Mat. ${\bf 17}$, 499
+(2018)].",1808.01045v1
+2023-02-28,Linear and nonlinear spin current response in anisotropic spin-orbit coupled systems,"We calculate the linear and the second harmonic (SH) spin current response of
+two anisotropic systems with spin orbit (SO) interaction. The first system is a
+two-dimensional (2D) electron gas in the presence of Rashba and k-linear
+Dresselhaus SO couplings. The dependence of the anisotropic spin splitting on
+the sample growth direction introduces an additional path to modify the linear
+and nonlinear spectra. In particular, vanishing linear and second order spin
+conductivity tensors are achievable under SU(2) symmetry conditions,
+characterized by a collinear SO vector field. Additional conditions under which
+specific tensor components vanish are posible, without having such
+collinearity. Thus, a proper choice of the growth direction and SO strengths
+allows to select the polarization of the linear and SH spin currents according
+to the direction of flowing. The second system is an anisotropic 2D free
+electron gas with anisotropic Rashba interaction, which has been employed to
+study the optical conductivity of 2D puckered structures with anisotropic
+energy bands. The presence of mass anisotropy and an energy gap open several
+distinct scenarios for the allowed optical interband transitions, which
+manifest in the linear and SH response contrastingly. The linear response
+displays only out-of-plane spin polarized currents, while the SH spin currents
+flow with spin orientation lying parallel to the plane of the system strictly.
+The models illustrate the possibility of the nonlinear spin Hall effect in
+systems with SO interaction, under the presence or absence of time-reversal
+symmetry. The results suggest different ways to manipulate the linear",2302.14238v1
+2017-10-30,Quantum Spin-Hall Effect of Light at Bound States in the Continuum,"The discovery of the topological nature of free-space light and its quantum
+chiral behavior has recently raised large attention. This important scientific
+endeavor features spin-based integrated quantum technologies. Herein, we
+discuss a novel phenomenon based on a resonantly-enhanced quantum spin-Hall
+transport of light observed in a dielectric resonator operating near the
+bound-state-in-continuum (BIC) regime. The BIC mode is characterized by a
+transverse photonic spin angular momentum density extended on a macroscopic
+area. As such, the experimental excited mode in near-BIC regime generates
+resonant surface waves characterized by spin-momentum locking and that
+propagate along the symmetry axes of the structure. In addition, the generated
+side waves are interpreted as an abrupt nonparaxial redirection of the exciting
+far field light, which is responsible for the spin-to-orbital angular momentum
+conversion evidenced in the spin-orbit asymmetry measured in the intensity of
+the side waves. The experimental results are in excellent agreement with a
+model that combines geometric parallel transport of light polarization and
+spin-momentum locking. In addition, breaking the excitation symmetry leads to a
+total spin-directive coupling. Our results reveal the possibility of a
+BIC-enhanced macroscopic spin-directive coupling, a novel fundamental mechanism
+of light-spin manipulation that will have strong impact on emerging quantum
+technologies.",1710.10862v1
+2022-07-26,Switching modulation of spin transport in ferromagnetic tetragonal silicene,"We study the band structure and transport properties of ferromagnetic
+tetragonal silicene nanoribbons by using the non-equilibrium Green's function
+method. The band structure and spin-dependent conductance are discussed under
+the combined effect of the external electric field, potential energy, exchange
+field and the spin-orbit coupling. One can easily realize a phase transition
+from a semimetallic to a semiconducting state by changing the transverse width
+of the nanoribbon. Separation of spin-dependent conductances arises from the
+effect of exchange field and the spin-orbit coupling, while zero-conductance
+behaviors exhibit spin-dependent band gaps induced by the electric field. We
+propose a device configuration of four-terminal tetragonal silicene nanoribbon
+with two central channels. It is found that spin current can be controlled by
+utilizing two switches. The switch with a high potential barrier can block
+electrons flowing from the central scattering region into other terminals.
+Interestingly, applying only one switch can realize spin-dependent zero
+conductance and large spin polarization. Two switches can provide multiple
+operations for controlling spin-dependent transport properties. The two-channel
+ferromagnetic tetragonal silicene nanoribbon can realize an effective
+separation of spin current, which may be a potential candidate for spintronic
+devices.",2207.12676v2
+2019-07-22,Spin-lattice and electron-phonon coupling in 3$d$/5$d$ hybrid Sr$_3$NiIrO$_6$,"While 3$d$-containing materials display strong electron correlations, narrow
+band widths, and robust magnetism, 5$d$ systems are recognized for strong
+spin-orbit coupling, increased hybridization, and more diffuse orbitals.
+Combining these properties leads to novel behavior. Sr$_3$NiIrO$_6$, for
+example, displays complex magnetism and ultra-high coercive fields - up to an
+incredible 55~T. Here, we combine infrared and optical spectroscopies with
+high-field magnetization and first principles calculations to explore the
+fundamental excitations of the lattice and related coupling processes including
+spin-lattice and electron-phonon mechanisms. Magneto-infrared spectroscopy
+reveals spin-lattice coupling of three phonons that modulate the Ir environment
+to reduce the energy required to modify the spin arrangement. While these modes
+primarily affect exchange within the chains, analysis also uncovers important
+inter-chain motion. This provides a mechanism by which inter-chain interactions
+can occur in the developing model for ultra-high coercivity. At the same time,
+analysis of the on-site Ir$^{4+}$ excitations reveals vibronic coupling and
+extremely large crystal field parameters that lead to a t$_{2g}$-derived
+low-spin state for Ir. These findings highlight the spin-charge-lattice
+entanglement in Sr$_3$NiIrO$_6$ and suggest that similar interactions may take
+place in other 3$d$/5$d$ hybrids.",1907.09392v1
+2022-06-01,Signatures of spin precession and nutation in isolated black-hole binaries,"The spin precession of binary black holes (BBHs) that originate from isolated
+high-mass binary stars is determined by the interplay of phenomena such as
+tides, winds, accretion, common-envelope evolution, natal kicks, and stellar
+core-envelope coupling. In previous work, we identified regions of the
+parameter space that may produce BBHs with large misalignments from natal kicks
+and high spin magnitudes from three mechanisms - tides, accretion, or
+inheritance via minimal core-envelope coupling. Here, we explore the spin
+precession of such BBHs using five parameters that describe the amplitude and
+frequency with which the orbital angular momentum precesses and nutates about
+the total angular momentum, modulating the gravitational-wave emission.
+Precession is generally possible for sufficiently strong natal kicks provided
+at least one of the black holes is spinning. Nutation is a consequence of
+spin-spin coupling and depends on the three spin-up mechanisms. Tidal
+synchronization can leave a distinct correlation between the aligned effective
+spin and the nutation frequency, but does not produce large nutations. When a
+black hole accretes $\gtrsim 20\%$ of its companion's envelope, the precession
+frequency and amplitude are large. A much smaller amount of accretion, e.g.,
+$\approx 2\%$, is needed to provide a large precession frequency and amplitude
+when the accretor is a Wolf-Rayet (WR) star. The inheritance of high natal WR
+spins ($\gtrsim 5\%$ of their maximum breakup value) via minimal core-envelope
+coupling is the most promising mechanism for producing nutating BBHs, implying
+that a measurement of nutation from gravitational-wave observations may suggest
+isolated-binary origin with minimal core-envelope coupling.",2206.00391v2
+2020-01-13,Deconfinement of Mott Localized Electrons into Topological and Spin-Orbit Coupled Dirac Fermions,"The interplay of electronic correlations, spin-orbit coupling and topology
+holds promise for the realization of exotic states of quantum matter. Models of
+strongly interacting electrons on honeycomb lattices have revealed rich phase
+diagrams featuring unconventional quantum states including chiral
+superconductivity and correlated quantum spin Hall insulators intertwining with
+complex magnetic order. Material realizations of these electronic states are
+however scarce or inexistent. In this work, we propose and show that stacking
+1T-TaSe$_{2}$ into bilayers can deconfine electrons from a deep Mott insulating
+state in the monolayer to a system of correlated Dirac fermions subject to
+sizable spin-orbit coupling in the bilayer. 1T-TaSe$_{2}$ develops a
+Star-of-David (SoD) charge density wave pattern in each layer. When the SoD
+centers belonging to two adyacent layers are stacked in a honeycomb pattern,
+the system realizes a generalized Kane-Mele-Hubbard model in a regime where
+Dirac semimetallic states are subject to significant Mott-Hubbard interactions
+and spin-orbit coupling. At charge neutrality, the system is close to a quantum
+phase transition between a quantum spin Hall and an antiferromagnetic
+insulator. We identify a perpendicular electric field and the twisting angle as
+two knobs to control topology and spin-orbit coupling in the system. Their
+combination can drive it across hitherto unexplored grounds of correlated
+electron physics including a quantum tricritical point and an exotic
+first-order topological phase transition.",2001.04102v2
+2017-04-19,Exploring a proximity-coupled Co chain on Pb(110) as a possible Majorana platform,"Linear, suspended chains of magnetic atoms proximity coupled to an s-wave
+superconductor are predicted to host Majorana zero modes at the chain ends in
+the presence of strong spin-orbit coupling. Specifically, iron (Fe) chains on
+Pb(110) have been explored as a possible system to exhibit topological
+superconductivity and host Majorana zero-modes [Nadj-Perge, et al., Science
+346, 602 (2014)]. Here, we study chains of the transition metal cobalt (Co) on
+Pb(110) and check for topological signatures. Using spin-polarized scanning
+tunneling spectroscopy, we resolve ferromagnetic order in the $d$ bands of the
+chains. Interestingly, also the subgap Yu-Shiba-Rusinov (YSR) bands carry a
+spin polarization as was predicted decades ago. Superconducting tips allow us
+to resolve further details of the YSR bands and in particular resonances at
+zero energy. We map the spatial distribution of the zero-energy signal and find
+it delocalized along the chain. Hence, despite of the ferromagnetic coupling
+within the chains and the strong-spin orbit coupling in the superconductor, we
+do not find clear evidence of Majorana modes. Simple tight-binding calculations
+suggest that the spin-orbit-split bands may cross the Fermi level four times
+which suppresses the zero-energy modes.",1704.05756v1
+2021-11-09,Spin-lattice couplings in two-dimensional CrI$_3$ from first-principles study,"Since thermal fluctuations become more important as dimensions shrink, it is
+expected that low-dimensional magnets are more sensitive to lattice distortions
+and phonons than bulk systems are. Here we present a fully relativistic
+first-principles study on the spin-lattice coupling, i.e. how the magnetic
+interactions depend on local lattice distortions, of the prototypical
+two-dimensional ferromagnet CrI$_3$. We extract an effective measure of the
+spin-lattice coupling in CrI$_3$ which is up to ten times larger than what is
+found for bcc Fe. The magnetic exchange interactions, including Heisenberg and
+relativistic Dzyaloshinskii-Moriya interactions, are sensitive both to the
+in-plane motion of Cr atoms and out-of-plane motion of ligand atoms. We find
+that significant magnetic pair interactions change sign from ferromagnetic (FM)
+to anti-ferromagnetic (AFM) for atomic displacements larger than 0.16 {\AA}. We
+explain the observed strong spin-lattice coupling by analyzing the orbital
+decomposition of isotropic exchange interactions, involving different
+crystal-field-split Cr$-3d$ orbitals. The competition between the AFM t$_{2g}$
+- t$_{2g}$ and FM t$_{2g}$ - e$_{g}$ contributions depends on the bond angle
+formed by Cr and I atoms as well as Cr-Cr distance. In particular, if a Cr atom
+is displaced, the FM-AFM sign change when the I-Cr-I bond angle approaches
+90$^\circ$. The obtained spin-lattice coupling constants, along with the
+microscopic orbital analysis can act as a guiding principle for further studies
+of the thermodynamic properties and combined magnon-phonon excitations in
+two-dimensional magnets.",2111.05382v1
+2002-07-04,"Dynamics, Selection Rules and Dzyaloshinsky-Moriya interactions in Strongly Frustrated Magnets","Anisotropic spin-spin interactions of the symmetry described by Dzyaloshinsky
+and Moriya are generally considered weak, as they depend on the spin-orbit
+couplings. In frustrated spin systems with singlet ground states they can,
+however, have rather strong effects. We discuss recent results related to two
+gapped spin systems: $\rm CuGeO_3$ and $\rm SrCu_2(BO_3)_2$ in particular. In
+the first compound the Dzyaloshinsky-Moriya interactions effectively lower the
+symmetry of the magnetic unit cell and this leads to doubling of the low
+frequency mode. In the second case, the Dzyaloshinsky-Moriya interactions also
+split the lowest magnon mode linearly in the spin-orbit coupling. In addition,
+the relatively weak Dzyaloshinsky-Moriya interactions can dominate the
+dispersion.
+  Consideration of the selection rules for optical transitions show that while
+the Dzyaloshinsky-Moriya interactions can explain much of the dynamics, they do
+not explain the observed transition amplitudes. This leads to a review of
+recent calculations of anisotropic spin-phonon couplings. We discuss how this
+leads to a novel mechanism to explain the ESR intensities in the spin gap
+systems discussed. Selection rules for this novel mechanism involving coupling
+to the electric field of the resonant probe are discussed and relation to
+polarised neutron experiments briefly mentioned.",0207116v1
+2015-09-21,Isotropic and Anisotropic Regimes of the Field-Dependent Spin Dynamics in Sr2IrO4: Raman Scattering Studies,"A major focus of experimental interest in Sr2IrO4 has been to clarify how the
+magnetic excitations of this strongly spin-orbit coupled system differ from the
+predictions of anisotropic 2D spin-1/2 Heisenberg model and to explore the
+extent to which strong spin-orbit coupling affects the magnetic properties of
+iridates. Here, we present a high-resolution inelastic light (Raman) scattering
+study of the low energy magnetic excitation spectrum of Sr2IrO4 and doped
+Eu-doped Sr2IrO4 as functions of both temperature and applied magnetic field.
+We show that the high-field (H>1.5 T) in-plane spin dynamics of Sr2IrO4 are
+isotropic and governed by the interplay between the applied field and the small
+in-plane ferromagnetic spin components induced by the Dzyaloshinskii-Moriya
+interaction. However, the spin dynamics of Sr2IrO4 at lower fields (H<1.5 T)
+exhibit important effects associated with interlayer coupling and in-plane
+anisotropy, including a spin-flop transition at Hc in Sr2IrO4 that occurs
+either discontinuously or via a continuous rotation of the spins, depending
+upon the in-plane orientation of the applied field. These results show that
+in-plane anisotropy and interlayer coupling effects play important roles in the
+low-field magnetic and dynamical properties of Sr2IrO4.",1509.06409v1
+2012-11-28,Competing topological phases in few-layer graphene,"We investigate the effect of spin-orbit coupling on the band structure of
+graphene-based two-dimensional Dirac fermion gases in the quantum Hall regime.
+Taking monolayer graphene as our first candidate, we show that a quantum phase
+transition between two distinct topological states -- the quantum Hall and the
+quantum spin Hall phases -- can be driven by simply tuning the Fermi level with
+a gate voltage. This transition is characterized by the existence of a chiral
+spin-polarized edge state propagating along the interface separating the two
+topological phases. We then apply our analysis to the more difficult case of
+bilayer graphene. Unlike in monolayer graphene, spin-orbit coupling by itself
+has indeed been predicted to be unsuccessful in driving bilayer graphene into a
+topological phase, due to the existence of an even number of pairs of
+spin-polarized edge states. While we show that this remains the case in the
+quantum Hall regime, we point out that by additionally breaking the layer
+inversion symmetry, a non-trivial quantum spin Hall phase can re-emerge in
+bilayer graphene at low energy. We consider two different symmetry-breaking
+mechanisms: inducing spin-orbit coupling only in the upper layer, and applying
+a perpendicular electric field. In both cases, the presence at low energy of an
+odd number of pairs of edge states can be driven by an exchange field. The
+related situation in trilayer graphene is also discussed.",1211.6628v1
+2014-07-08,Dynamical competition between Quantum Hall and Quantum Spin Hall effects,"In this paper we investigate the occurrence of quantum phase transitions in
+topological systems out of equi- librium. More specifically, we consider
+graphene with a sizable spin-orbit coupling, irradiated by circularly-
+polarized light. In the absence of light, the spin-orbit coupling drives a
+quantum spin Hall phase where edge currents with opposite spins
+counter-propagate. On the other hand, the light generates a time-dependent
+vector potential, which leads to a hopping parameter with staggered
+time-dependent phases around the benzene ring. The model is a dynamical version
+of the Haldane model, which considers a static staggered flux with zero total
+flux through each plaquette. Since the light breaks time-reversal symmetry, a
+quantum Hall phase protected by an integer topological invariant arises. By
+numerically solving the complete problem, with spin-orbit coupling and light,
+and investigating different values of the driving frequency {\omega}, we show
+that the spectrum exhibits non-trivial gaps not only at zero energy, but also
+at {\omega}/2. This additional gap is created by photon resonances between the
+valence and conduction band of graphene, and the symmetry of the spectrum
+forces it to lie at {\omega}/2. By increasing the intensity of the irradiation,
+the topological state in the zero energy gap undergoes a dynamical phase
+transition from a quantum spin Hall to a quantum Hall phase, whereas the gap
+around {\omega}/2 remains in the quantum Hall regime.",1407.2152v3
+2016-06-01,Entanglement and manipulation of the magnetic and spin-orbit order in multiferroic Rashba semiconductors,"The interplay between electronic eigenstates, spin, and orbital degrees of
+freedom, combined with fundamental breaking of symmetries is currently one of
+the most exciting fields of research. Multiferroics such as (GeMn)Te fulfill
+these requirements providing unusual physical properties due to the coexistence
+and coupling between ferromagnetic and ferroelectric order in one and the same
+system. Here we show that multiferroic (GeMn)Te inherits from its parent
+ferroelectric {\alpha}-GeTe compound a giant Rashba splitting of
+three-dimensional bulk states which competes with the Zeeman spin splitting
+induced by the magnetic exchange interactions. The collinear alignment of
+ferroelectric and ferromagnetic polarization leads to an opening of a tunable
+Zeeman gap of up to 100 meV around the Dirac point of the Rashba bands, coupled
+with a change in spin texture by entanglement of magnetic and spin-orbit order.
+Through applications of magnetic fields, we demonstrate manipulation of spin-
+texture by spin resolved photoemission experiments, which is also expected for
+electric fields based on the multiferroic coupling. The control of spin
+helicity of the bands and its locking to ferromagnetic and ferroelectric order
+opens fascinating new avenues for highly multifunctional multiferroic Rashba
+devices suited for reprogrammable logic and/or nonvolatile memory applications.",1606.00241v2
+2018-09-13,"Spin Susceptibility, Upper Critical Field and Disorder Effect in $j=\frac{3}{2}$ Superconductors with Singlet-Quintet Mixing","Recently, a new pairing state with the mixing between s-wave singlet channel
+and isotropic d-wave quintet channel induced by centrosymmetric spin-orbit
+coupling has been theoretically proposed in the superconducting materials with
+$j=\frac{3}{2}$ electrons. In this work, we derive the expressions of the
+zero-temperature spin susceptibility, the upper critical field close to the
+zero-field critical temperature $T_c$ and the critical temperature with weak
+random non-magnetic disorders for the singlet-quintet mixed state based on the
+Luttinger model. Our study revealed the following features of the
+singlet-quintet mixing. (1) The zero-temperature spin susceptibility remains
+zero for the singlet-quintet mixed state if only the centrosymmetric spin-orbit
+coupling is taken into account, and will deviate from zero when the
+non-centrosymmetric spin-orbit coupling is introduced. (2) The singlet-quintet
+mixing can help enhance the upper critical field roughly because it can
+increase $T_c$. (3) Although the quintet channel is generally suppressed by the
+non-magnetic disorder scattering, we find the strong mixing between singlet and
+quintet channels can help to stabilize the quintet channel. As a result, we
+still find a sizable quintet component mixed into the singlet channel in the
+presence of weak random non-magnetic disorders. Our work provides the guidance
+for future experiments on spin susceptibility and upper critical field of the
+singlet-quintet mixed superconducting states, and illustrates the stability of
+the singlet-quintet mixing against the weak random non-magnetic disorder.",1809.04736v1
+2020-12-22,Quantum Anomalous Hall Effect in Magnetic Doped Topological Insulators and Ferromagnetic Spin-Gapless Semiconductors -- A Perspective Review,"Quantum anomalous Hall effect, with a trademark of dissipationless chiral
+edge states for electronics/spintronics transport applications, can be realized
+in materials with large spin-orbit coupling and strong intrinsic magnetization.
+After Haldane seminal proposal, several models have been presented to
+control/enhance the spin-orbit coupling and intrinsic magnetic exchange
+interaction. After brief introduction of Haldane model for spineless fermions,
+following three fundamental quantum anomalous Hall models are discussed in this
+perspective review: (i) low-energy effective four band model for magnetic-doped
+topological insulator (Bi,Sb)2Te3 thin films, (ii) four band tight-binding
+model for graphene with magnetic adatoms, and (iii) two (three) band spinfull
+tight-binding model for ferromagnetic spin-gapless semiconductors with
+honeycomb (kagome) lattice where ground state is intrinsically ferromagnetic.
+These models cover two-dimensional Dirac materials hosting spinless, spinful
+and spin-degenerate Dirac points where various mass terms open a band gap and
+lead to quantum anomalous Hall effect. With emphasize on the topological phase
+transition driven by ferromagnetic exchange interaction and its interplay with
+spin-orbit-coupling, we discuss various symmetry constraints on the nature of
+mass term and the materialization of these models. We hope this study will shed
+light on the fundamental theoretical perspectives of quantum anomalous Hall
+materials.",2101.01074v1
+2019-11-08,Ground-state properties of spin-orbit-coupled dipolar Bose-Einstein condensates with in-plane gradient magnetic field,"We investigate the ground-state properties of spin-orbit-coupled
+pseudo-spin-1/2 dipolar Bose-Einstein condensates (BECs) in a two-dimensional
+harmonic trap and an in-plane quadrupole field. The effects of spin-orbit
+coupling (SOC), dipole-dipole interaction (DDI) and the in-plane quadrupole
+field on the ground-state structures and spin textures of the system are
+systematically analyzed and discussed. For fixed SOC and DDI strengths, the
+system shows a quadrupole stripe phase with a half-quantum vortex, or a
+quadrupole Thomas-Fermi phase with a half-quantum antivortex for small
+quadrupole field strength, depending on the ratio between inter- and
+intraspecies interaction. As the quadrupole field strength enhances, the system
+realizes a ring mixed phase with a hidden vortex-antivortex cluster rather than
+an ordinary giant vortex in each component. Of particular interest, when the
+strengths of DDI and quadrupole field are fixed, strong SOC leads to the
+formation of criss-crossed vortex string structure. For given SOC and
+quadrupole field, the system for strong DDI displays a sandwich-like structure,
+or a special delaminated structure with a prolate antivortex in the spin-up
+component. In addition, typical spin textures for the ground states of the
+system are analyzed. It is shown that the system sustains exotic topological
+structures, such as a hyperbolic spin domain wall,
+skyrmion-half-antiskyrmion-antiskyrmion lattice,
+half-skyrmion-skyrmion-half-antiskyrmion lattice, and a drum-shaped antimeron.",1911.03269v1
+2021-03-12,Magnetoelectric torque and edge currents in spin-orbit coupled graphene nanoribbons,"For graphene nanoribbons with Rashba spin-orbit coupling, the peculiar
+magnetic response due to the presence of a magnetization and geometric
+confinement are analyzed within a tight-binding model. We observe a sizable
+transverse susceptibility that can be considered as a gate voltage-induced
+magnetoelectric torque without the need of a bias voltage, with different
+directions for zigzag and armchair ribbons. The local torque generates
+non-collinear spin polarization between the two edges and/or along the ribbon,
+and the net torque averages to zero if the magnetization is homogeneous.
+Nevertheless, a nonzero net torque can appear in partially magnetized
+nanoribbons or in nanoflakes of irregular shapes. The equilibrium spin current
+produced by the spin-orbit coupling also appears in nanoribbons, but the
+component flowing in the direction of confinement is strongly suppressed. Even
+without the magnetization, an out-of-plane polarized chiral edge spin current
+is produced, resembling that in the quantum spin Hall effect. Moreover, a
+magnetization pointing perpendicular to the edge produces a laminar flow of
+edge charge currents, whose flow direction is symmetric (non chiral) or
+antisymmetric (chiral) between the two edges depends on whether the
+magnetization points in-plane or out-of-plane.",2103.07426v1
+2022-08-28,Spin Josephson effects of spin-orbit-coupled Bose-Einstein condensates in a non-Hermitian double well,"In this paper, we investigate the spin and tunneling dynamics of a
+spin-orbit-coupled noninteracting Bose-Einstein condensate in a periodically
+driven non-Hermitian double-well potential. Under high-frequency driving, we
+obtain the effective time-averaged Hamiltonian by using the standard
+time-averaging method, and analytically calculate the Floquet quasienergies,
+revealing that the parity-time (PT)-breaking phase transition appears even for
+arbitrarily small non-Hermitian parameters when the spin-orbit coupling
+strength takes half-integer value, irrespective of the values of other
+parameters used. When the system is PT-symmetric with balanced gain and loss,
+we find numerically and analytically that in the broken PT-symmetric regions,
+there will exist the net spin current together with a vanishing atomic current,
+if we drop the contribution of the exponential growth of the norm to the
+current behaviors. When the system is non-PT-symmetric, though the
+quasienergies are partial complex, a stable net spin current can be generated
+by controlling the periodic driving field, which is accompanied by a spatial
+localization of the condensate in the well with gain. The results deepen the
+understanding of non-Hermitian physics and could be useful for engineering a
+variety of devices for spintronics.",2208.13198v1
+2022-10-06,Direct probing of a large spin-orbit coupling in the FeSe superconducting monolayer on STO: Evidence for nontrivial topological states,"In condensed-matter physics spin-orbit coupling (SOC) is a fundamental
+physical interaction, which describes how the electrons' spin couples to their
+orbital motion. It is the source of a vast variety of fascinating phenomena in
+solids such as topological phases of matter, quantum spin Hall states, and many
+other exotic quantum states. Although in most theoretical descriptions of the
+phenomenon of high-temperature superconductivity SOC has been neglected,
+including this interaction can, in principle, revise the microscopic picture of
+superconductivity in these compounds. Not only the interaction leading to
+Cooper pairing but also the symmetry of the order parameter and the topological
+character of the involved states can be determined by SOC. Here by preforming
+energy-, momentum-, and spin-resolved spectroscopy experiments with an
+unprecedented resolution we demonstrate that while probing the dynamic charge
+response of the FeSe monolayer on strontium titanate, a prototype two
+dimensional high-temperature superconductor using slow electrons, the
+scattering cross-section shows a considerable spin asymmetry. We unravel the
+origin of the observed spin asymmetry by developing a model in which SOC is
+taken into consideration. Our analysis indicates that SOC in this two
+dimensional superconductor is rather strong. We anticipate that such a strong
+SOC can have several serious consequences on the electronic structures and can
+lead to the formation of topological states. Moreover, a sizable SOC can
+compete with other pairing scenarios and is crucial for the mechanism of
+high-temperature superconductivity.",2210.02810v1
+2023-02-04,Multi-Stability in Cavity QED with Spin-Orbit Coupled Bose-Einstein Condensate,"We investigate the occurrence of steady-state multi-stability in a cavity
+system containing spin-orbit coupled Bose-Einstein condensate and driven by a
+strong pump laser. The applied magnetic field splits the Bose-Einstein
+condensate into pseudo-spin states, which then became momentum sensitive with
+two counter propagating Raman lasers directly interacting with ultra-cold
+atoms. After governing the steady-state dynamics for all associated subsystems,
+we show the emergence of multi-stable behavior of cavity photon number, which
+is unlike with previous investigation on cavity-atom systems. However, this
+multi-stability can be tuned with associated system parameters. Further, we
+illustrate the occurrence of mixed-stability behavior for atomic population of
+the pseudo spin-$\uparrow$ amd spin-$\downarrow$ states, which are appearing in
+so-called bi-unstable form. The collective behavior of these atomic number
+states interestingly possesses a transitional interface among the population of
+both spin states, which can be enhance and controlled by spin-orbit coupling
+and Zeeman field effects. Furthermore, we illustrate the emergence of secondary
+interface mediated by increasing the mechanical dissipation rate of the
+pseudo-spin states. These interfaces could be cause by the non-trivial behavior
+of synthetic spin state mediated by cavity. Our findings are not only crucial
+for the subject of optical switching, but also could provide foundation for
+future studies on mechanical aspect of synthetic atomic states with cavity
+quantum electrodynamics.",2302.02147v1
+2019-05-23,Spin-orbit coupling and crystal-field distortions for a low-spin $3d^5$ state in BaCoO$_{3}$,"We have studied the electronic structure of BaCoO$_3$ using soft x-ray
+absorption spectroscopy at the Co-$L_{2,3}$ and O-$K$ edges, magnetic circular
+dichroism at the Co-$L_{2,3}$ edges, as well as valence band hard x-ray
+photoelectron spectroscopy. The quantitative analysis of the spectra
+established that the Co ions are in the formal low-spin tetravalent 3$d^5$
+state and that the system is a negative charge transfer Mott insulator. The
+spin-orbit coupling plays also an important role for the magnetism of the
+system. At the same time, a trigonal crystal field is present with sufficient
+strength to bring the 3$d^5$ ion away from the $J_{eff} = 1/2$ state. The sign
+of this crystal field is such that the $a_{1g}$ orbital is doubly occupied,
+explaining the absence of a Peierl's transition in this system which consists
+of chains of face-sharing CoO$_6$ octahedra. Moreover, with one hole residing
+in the $e_g^{\pi}$, the presence of an orbital moment and strong
+magneto-crystalline anisotropy can be understood. Yet, we also infer that
+crystal fields with lower symmetry must be present to reproduce the measured
+orbital moment quantitatively, thereby suggesting the possibility for orbital
+ordering to occur in BaCoO$_3$.",1905.09549v1
+2016-03-01,"Spin orientations of the spin-half Ir4+ ions in Sr3NiIrO6, Sr2IrO4 and Na2IrO3: Density functional, perturbation theory and Madelung potential analyses","The spins of the low-spin Ir4+ (S = 1/2, d5) ions at the octahedral sites of
+the oxides Sr3NiIrO6, Sr2IrO4 and Na2IrO3 exhibit preferred orientations with
+respect to their IrO6 octahedra. We evaluated the magnetic anisotropies of
+these S = 1/2 ions on the basis of DFT calculations including spin-orbit
+coupling (SOC), and probed their origin by performing perturbation theory
+analyses with SOC as perturbation within the LS coupling scheme. The observed
+spin orientations of Sr3NiIrO6 and Sr2IrO4 are correctly predicted by DFT
+calculations, and are accounted for by the perturbation theory analysis. As for
+the spin orientation of Na2IrO3, both experimental studies and DFT calculations
+have not been unequivocal. Our analysis reveals that the Ir4+ spin orientation
+of Na2IrO3 should have nonzero components along the c- and a-axes directions.
+The spin orientations determined by DFT calculations are sensitive to the
+accuracy of the crystal structures employed, which is explained by perturbation
+theory analyses when interactions between adjacent Ir4+ ions are taken into
+consideration. There are indications implying that the 5d electrons of Na2IrO3
+are less strongly localized compared with those of Sr3NiIrO6 and Sr2IrO4. This
+implication was confirmed by showing that the Madelung potentials of the Ir4+
+ions are less negative in Na2IrO3 than in Sr3NiIrO6, Sr2IrO4. Most
+transition-metal S = 1/2 ions do have magnetic anisotropies because the SOC
+induces interactions among their crystal-field split d-states, and the
+associated mixing of the states modifies only the orbital parts of the states.
+This finding cannot be mimicked by a spin Hamiltonian because this model
+Hamiltonian lacks the orbital degree of freedom, thereby leading to the
+spin-half syndrome. The spin-orbital entanglement for the 5d spin-half ions
+Ir4+ is not as strong as has been assumed lately.",1603.00523v2
+2023-03-25,Natural orbitals renormalization group approach to a spin-1/2 impurity interacting with two helical liquids,"Using the natural orbitals renormalization group, we studied the problem of a
+localized spin- 1/2 impurity coupled to two helical liquids via the Kondo
+interaction in a quantum spin Hall insulator, based on the Kane-Mele model
+defined in a finite zigzag graphene nanoribbon. We investigated the influence
+of the Kondo couplings with the helical liquids on both the static and dynamic
+properties of the ground state. The number and distinct spatial structures of
+the active natural orbitals (ANOs), which play essential roles in constructing
+the ground-state wave function, were first analyzed. Our numerical results
+indicate that two ANOs emerge, equal to the number of helical liquids.
+Specifically, at the coupling symmetry point, both ANOs are fully active with
+their spatial structures being respectively constituted by the different
+helical liquids. In comparison, when deviating from the symmetry point, only
+one ANO remains fully active, which is dominantly constructed by the helical
+liquid with the larger Kondo coupling. Local screening of the impurity,
+described by the impurity spin polarization and susceptibility, was further
+studied. It shows that at the coupling symmetry point, the impurity is
+maximally polarized and the spin susceptibility reaches the maximum. On the
+contrary, the impurity tends to be screened without polarization when the Kondo
+couplings deviate well from the symmetry point. The Kondo screening cloud,
+manifested by the spin correlation between the impurity and the conduction
+electrons, was finally explored. It is demonstrated that the Kondo cloud is
+mainly formed by the helical liquid with the larger Kondo coupling to the
+impurity. On the other hand, the spin-orbital coupling breaks the symmetry in
+spatial distribution of the spin correlation, leading to anisotropy in the
+Kondo cloud.",2303.14331v1
+2015-01-31,Spin-orbit-induced exotic insulators in a three-orbital Hubbard model with $(t_{2g})^5$ electrons,"On the basis of the multi-orbital dynamical mean field theory, a
+three-orbital Hubbard model with a relativistic spin-orbit coupling (SOC) is
+studied at five electrons per site. The numerical calculations are performed by
+employing the continuous-time quantum Monte Carlo (CTQMC) method based on the
+strong coupling expansion. We find that appropriately choosing bases, i.e., the
+maximally spin-orbit-entangled bases, drastically improve the sign problem in
+the CTQMC calculations, which enables us to treat exactly the full Hund's
+coupling and pair hopping terms. This improvement is also essential to reach at
+low temperatures for a large SOC region where the SOC most significantly
+affects the electronic structure. We show that a metal-insulator transition is
+induced by the SOC for fixed Coulomb interactions. The insulating state for
+smaller Coulomb interactions is antiferromagnetically ordered with the local
+effective total angular momentum $j=1/2$, in which the $j=1/2$ based band is
+essentially half-filled while the $j=3/2$ based bands are completely occupied.
+More interestingly, for larger Coulomb interactions, we find that an excitonic
+insulating state emerges, where the condensation of an electron-hole pair in
+the $j=1/2$ and $j=3/2$ based bands occurs. The origin of the excitonic
+insulator as well as the experimental implication is discussed.",1502.00108v1
+2016-02-08,Tight-binding theory of NMR shifts in topological insulators Bi2Se3 and Bi2Te3,"Motivated by recent nuclear magnetic resonance (NMR) experiments, we present
+a microscopic sp3 tight-binding model calculation of the NMR shifts in bulk
+Bi2Se3, and Bi2Te3. We compute the contact, dipolar, orbital and core
+polarization contributions to the carrier-density-dependent part of the NMR
+shifts in Bi209, Te125 and Se77. The spin-orbit coupling and the layered
+crystal structure result in a contact Knight shift with strong uniaxial
+anisotropy. Likewise, because of spin-orbit coupling, dipolar interactions make
+a significant contribution to the isotropic part of the NMR shift. The contact
+interaction dominates the isotropic Knight shift in Bi209 NMR, even though the
+electronic states at the Fermi level have a rather weak s-orbital character. In
+contrast, the contribution from the contact hyperfine interaction to the NMR
+shift of Se77 and Te125 is weak compared to the dipolar and orbital shifts
+therein. In all cases, the orbital shift is at least comparable to the contact
+and dipolar shifts, while the shift due to core polarization is subdominant
+(except for Te nuclei located at the inversion centers). By artificially
+varying the strength of spin-orbit coupling, we evaluate the evolution of the
+NMR shift across a band inversion but find no clear signature of the
+topological transition.",1602.02649v2
+2017-05-04,103-Compound Band Structure Benchmark of Post-SCF Spin-Orbit Coupling Treatments in Density-Functional Theory,"We quantify the accuracy of different non-self-consistent and self-consistent
+spin-orbit coupling (SOC) treatments in Kohn-Sham and hybrid density-functional
+theory by providing a band structure benchmark set for the valence and
+low-lying conduction energy bands of 103 inorganic compounds, covering chemical
+elements up to Po. Reference energy band structures for the PBE density
+functional are obtained using the full-potential (linearized) augmented plane
+wave code Wien2k, employing its self-consistent treatment of SOC including
+Dirac-like p$^{1/2}$ orbitals in the basis set. We use this benchmark set to
+benchmark a computationally simpler, non-self-consistent all-electron treatment
+of SOC based on scalar-relativistic orbitals and numeric atom-centered orbital
+basis functions. For elements up to Z$\approx$50, both treatments agree
+virtually exactly. For the heaviest elements considered (Tl, Pb, Bi, Po), the
+band structure changes due to SOC are captured with a relative deviation of 11%
+or less. For different density functionals (PBE vs. the hybrid HSE06), we show
+that the effect of spin-orbit coupling is usually similar but can be dissimilar
+if the qualitative features of the predicted underlying scalar-relativistic
+band structures do not agree. All band structures considered in this work are
+available online via the NOMAD Repository to aid in future benchmark studies
+and methods development.",1705.01804v2
+2009-10-17,Density functional study of the actinide nitrides,"The full potential all electron linearized augmented plane wave plus local
+orbitals (FP-LAPW + lo) method, as implemented in the suite of software WIEN2K,
+has been used to systematically investigate the structural, electronic, and
+magnetic properties of the actinide compounds AnN (An = Ac, Th, Pa, U, Np, Pu,
+Am). The theoretical formalism used is the generalized gradient approximation
+to density functional theory (GGA-DFT) with the Perdew-Burke-Ernzerhof (PBE)
+exchange-correlation functional. Each compound has been studied at six levels
+of theory: non-magnetic (NM), non-magnetic with spin-orbit coupling (NM+SOC),
+ferromagnetic (FM), ferromagnetic with spin-orbit coupling (FM+SOC),
+anti-ferromagnetic (AFM), and anti-ferromagnetic with spin-orbit coupling
+(AFM+SOC). The structural parameters, bulk moduli, densities of states, and
+charge distributions have been computed and compared to available experimental
+data and other theoretical calculations published in the literature. The total
+energy calculations indicate that the lowest energy structures of AcN, ThN, and
+PaN are degenerate at the NM+SOC, FM+SOC, and AFM+SOC levels of theory with
+vanishing total magnetic moments in the FM+SOC and AFM+SOC cases, making the
+ground states essentially non-magnetic with spin-orbit interaction. The ground
+states of UN, NpN, PuN, and AmN are found to be FM+SOC at the level of theory
+used in the present computations. The nature of the interactions between the
+actinide metals and nitrogen atom, and the implications on 5f electron
+delocalization and localization are discussed in detail.",0910.3337v1
+2018-08-21,Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4,"Spin-orbit entangled magnetic dipoles, often referred to as pseudospins,
+provide a new avenue to explore novel magnetism inconceivable in the weak
+spin-orbit coupling limit, but the nature of their low-energy interactions
+remains to be understood. We present a comprehensive study of the static
+magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott
+insulator Sr2IrO4. We find that in order to understand even basic magnetization
+measurements, a formerly overlooked in-plane anisotropy is fundamental. In
+addition to magnetometry, we use neutron diffraction, inelastic neutron
+scattering and resonant elastic and inelastic x-ray scattering to identify and
+quantify the interactions that determine the global symmetry of the system and
+govern the linear responses of pseudospins to external magnetic felds and their
+low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient
+for an accurate description of the magnetism in Sr2IrO4 and that
+pseudospin-lattice coupling is essential. This finding should be generally
+applicable to other pseudospin systems with sizable orbital moments sensitive
+to anisotropic crystalline environments.",1808.06920v2
+2001-07-02,Spin-1 effective Hamiltonian with three degenerate orbitals: An application to the case of V_2O_3,"Motivated by recent neutron and x-ray observations in V_2O_3, we derive the
+effective Hamiltonian in the strong coupling limit of an Hubbard model with
+three degenerate t_{2g} states containing two electrons coupled to spin S = 1,
+and use it to re-examine the low-temperature ground-state properties of this
+compound. An axial trigonal distortion of the cubic states is also taken into
+account. Since there are no assumptions about the symmetry properties of the
+hopping integrals involved, the resulting spin-orbital Hamiltonian can be
+generally applied to any crystallographic configuration of the transition metal
+ion giving rise to degenerate t_{2g} orbitals. Specializing to the case of
+V_2O_3 we consider the antiferromagnetic insulating phase. We find two
+variational regimes, depending on the relative size of the correlation energy
+of the vertical pairs and the in-plane interaction energy. The former favors
+the formation of stable molecules throughout the crystal, while the latter
+tends to break this correlated state. We determine in both cases the minimizing
+orbital solutions for various spin configurations, and draw the corresponding
+phase diagrams. We find that none of the symmetry-breaking stable phases with
+the real spin structure presents an orbital ordering compatible with the
+magnetic space group indicated by very recent observations of non-reciprocal
+x-ray gyrotropy in V_2O_3. We do however find a compatible solution with very
+small excitation energy in two distinct regions of the phase space, which might
+turn into the true ground state of V_2O_3 due to the favorable coupling with
+the lattice. We illustrate merits and drawbacks of the various solutions and
+discuss them in relation to the present experimental evidence.",0107026v1
+2022-08-18,Dynamics of quantum soliton in Lee-Huang-Yang spin-orbit coupled Bose-Einstein condensates,"We present the numerical results of the structure and dynamics of the
+self-bound ground state arising solely because of the presence of beyond mean
+field quantum fluctuation in spin-orbit coupled binary Bose-Einstein
+condensates in one dimension. Depending upon spin-obit (SO) and Rabi couplings,
+we observe that the ground state exhibits either quantum-bright (plane) or
+quantum-stripe soliton nature. We find an analytical soliton solution for
+non-zero SO coupling that matches quite well with the numerical results.
+Further, we investigate the dynamical stability of these solitons by adopting
+three protocols, such as (i) adding initial velocity to each component, (ii)
+quenching the SO and Rabi coupling parameters at initial and finite time, and
+(iii) allowing collision between the two spin-components by giving equal and
+opposite direction velocity to them. Many interesting dynamical features of the
+solitons, like, multi-fragmented, repelling, and breathing in time and
+space-time, are observed. For given Rabi coupling frequency, the breathing
+frequency of the soliton increases upon the increase in SO coupling, attaining
+a maximum at the critical SO coupling where the phase transition from the
+bright to stripe soliton occurs. We observe that the maximum breathing
+frequency exhibits power law dependence on the Rabi coupling frequency with an
+exponent $\sim 0.16$.",2208.08777v2
+2008-12-15,Magnetic and Metallic State at Intermediate Hubbard U Coupling in Multiorbital Models for Undoped Fe Pnictides,"Multi-orbital Hubbard model Hamiltonians for the undoped parent compounds of
+the Fe-pnictide superconductors are here investigated using mean-field
+techniques. For a realistic four-orbital model, our results show the existence
+of an intermediate Hubbard U coupling regime where the mean-field ground state
+has spin stripe magnetic order, as in neutron scattering experiments, while
+remaining metallic, due to the phenomenon of band overlaps. The angle-resolved
+photoemission intensity and Fermi surface of this magnetic and metallic state
+are discussed. Other models are also investigated, including a two orbital
+model where not only the mean-field technique can be used, but also Exact
+Diagonalization in small clusters and the Variational Cluster Approximation in
+the bulk. The combined results of the three techniques point toward the
+existence of an intermediate-coupling magnetic and metallic state in the
+two-orbital model, similar to the intermediate coupling mean-field state of the
+four-orbital model. We conclude that the state discussed here is compatible
+with the experimentally known properties of the undoped Fe-pnictides.",0812.2894v1
+2010-01-13,Cooperative Effect of Coulomb Interaction and Electron-Phonon Coupling on the Heavy Fermion State in the Two-Orbital Periodic Anderson Model,"We investigate the two-orbital periodic Anderson model, where the local
+orbital fluctuations of f-electrons couple with a two-fold degenerate
+Jahn-Teller phonon, by using the dynamical mean-field theory. It is found that
+the heavy fermion state caused by the Coulomb interaction between f-electrons U
+is largely enhanced due to the electron-phonon coupling g, in contrast to the
+case with the single-orbital periodic Anderson model where the effects of U and
+g compete to each other. In the heavy fermion state for large $U$ and g, both
+the orbital and lattice fluctuations are enhanced, while the charge (valence)
+and spin fluctuations are suppressed. In the strong coupling regime, a sharp
+soft phonon mode with a large spectral weight is observed for small U, while a
+broad soft phonon mode with a small spectral weight is observed for large U.
+The cooperative effect of U and g for half-filling with two f-electrons per
+atom $n_f=2$ is more pronounced than that for quarter-filling with $n_f=1$.",1001.2065v2
+2006-05-27,Higher-order spin effects in the dynamics of compact binaries I. Equations of motion,"We derive the equations of motion of spinning compact binaries including the
+spin-orbit (SO) coupling terms one post-Newtonian (PN) order beyond the
+leading-order effect. For black holes maximally spinning this corresponds to
+2.5PN order. Our result for the equations of motion essentially confirms the
+previous result by Tagoshi, Ohashi and Owen. We also compute the spin-orbit
+effects up to 2.5PN order in the conserved (Noetherian) integrals of motion,
+namely the energy, the total angular momentum, the linear momentum and the
+center-of-mass integral. We obtain the spin precession equations at 1PN order
+beyond the leading term, as well. Those results will be used in a future paper
+to derive the time evolution of the binary orbital phase, providing more
+accurate templates for LIGO-Virgo-LISA type interferometric detectors.",0605139v4
+2012-09-29,Probing in-medium spin-orbit potential with intermediate-energy heavy-ion collisions,"Incorporating for the first time both the spin and isospin degrees of freedom
+explicitly in transport model simulations of intermediate-energy heavy-ion
+collisions, we observe that a local spin polarization appears during collision
+process. Most interestingly, it is found that the nucleon spin up-down
+differential transverse flow is a sensitive probe of the spin-orbit
+interaction, providing a novel approach to probe both the density and isospin
+dependence of the in-medium spin-orbit coupling that is important for
+understanding the structure of rare isotopes and synthesis of superheavy
+elements.",1210.0158v2
+2013-02-01,Electronic Properties and Persistent Spin Currents of Nanospring under Static Magnetic Field,"Relativistic electronic properties of a nanospring under a static magnetic
+field are theoretically investigated in the present study. The wave equation
+accounting for the spin-orbit interaction is derived for the nanospring as a
+special case of the Pauli equation for a spin-1/2 particle confined to a curved
+surface under an electromagnetic field. We define the helical momentum operator
+and show that it commutes with the Hamiltonian owing to the helical geometry of
+the nanospring. The energy eigenstates are hence also the eigenstates of the
+helical momentum. We solve the equation numerically to obtain the surface wave
+functions and the energy spectra. The electronic properties are systematically
+examined by varying the parameters that characterize the system. It is
+demonstrated that either the nonzero spin-orbit interaction or the nonzero
+external magnetic field suffices for the occurrence of the persistent spin
+current on the nanospring. Two different mechanisms are shown to generate the
+persistent spin current. One employs the spin-orbit interaction coming from the
+local inversion asymmetry on the surface, while the other employs the curvature
+coupling with the external magnetic field.",1302.0066v1
+2017-01-22,Novel Magnetism and Local Symmetry Breaking in a Mott Insulator with Strong Spin Orbit Interactions,"Study of the combined effects of strong electronic correlations with
+spin-orbit coupling (SOC) represents a central issue in quantum materials
+research. Predicting emergent properties represents a huge theoretical problem
+since the presence of SOC implies that the spin is not a good quantum number.
+Existing theories propose the emergence of a multitude of exotic quantum
+phases, distinguishable by either local point symmetry breaking or local spin
+expectation values, even in materials with simple cubic crystal structure such
+as Ba$_2$NaOsO$_6$. Experimental tests of such theories by local probes are
+highly sought for. Here, we report on local measurements designed to
+concurrently probe spin and orbital/lattice degrees of freedom of
+Ba$_2$NaOsO$_6$. We find that a novel canted ferromagnetic phase which is
+preceded by local point symmetry breaking is stabilized at low temperatures, as
+predicted by quantum theories involving multipolar spin interactions.",1701.06117v1
+2018-01-17,Discovery of new magnetic orders on pyrochlore spinels,"Frustration in spin system can give rise to unique ordered states and as a
+consequence several physical phenomena are expected such as multiferroics, high
+temperature superconductors and anomalous hall effect. Here we report the ""new
+magnetic orders"" induced by anisotropic spin exchanges on pyrochlore spinels as
+the interplay of spin orbit coupling and geometrical frustration. Due to
+complicated superexchange paths of B-site spinels, we claim that anisotropic
+interaction between next-nearest neighbors play an important role. Based on the
+systematic studies of generic spin model, we argue that several classical spin
+states can be explored in spinel systems; local XY state, all-in all-out state,
+Palmer-Chalker state and coplanar spiral state. In addition, we reveal new
+types of magnetic phases with finite ordering wavevectors, labeled as
+'octagonal (prism)' state and '(distorted) cubic' states. When the 'octagonal
+prism' state is stabilized, non-zero scalar spin chirality induces alternating
+net current in addition to finite orbital current and orbital magnetization
+even in Mott insulators. Finally, we also discuss the relevance of 'distorted
+cubic' state to the magnetic order of spinel compound GeCo2O4.",1801.05820v1
+2020-02-13,Thermal effects on a nonadiabatic spin-flip protocol of spin-orbit qubits,"We study the influence of a thermal environment on a non-adiabatic spin-flip
+driving protocol of spin-orbit qubits. The driving protocol operates by moving
+the qubit, trapped in a harmonic potential, along a nanowire in the presence of
+a time-dependent spin-orbit interaction. We consider the harmonic degrees of
+freedom to be weakly coupled to a thermal bath. We find an analytical
+expression for the Floquet states and derive the Lindblad equation for a
+strongly non-adiabatically driven qubit. The Lindblad equation corrects the
+dynamics of an isolated qubit with Lamb shift terms and a dissipative
+behaviour. Using the Lindblad equation, the influence of a thermal environment
+on the spin-flip protocol is analysed.",2002.05548v1
+2017-11-13,On-Demand Spin-Orbit Interaction from Which-Layer Tunability in Bilayer Graphene,"Spin-orbit interaction (SOI) that is gate-tunable over a broad range is
+essential to exploiting novel spin phenomena. Achieving this regime has
+remained elusive because of the weakness of the underlying relativistic
+coupling and lack of its tunability in solids. Here we outline a general
+strategy that enables exceptionally high tunability of SOI through creating a
+which-layer spin-orbit field inhomogeneity in graphene multilayers. An external
+transverse electric field is applied to shift carriers between the layers with
+strong and weak SOI. Because graphene layers are separated by sub-nm scales,
+exceptionally high tunability of SOI can be achieved through a minute carrier
+displacement. A detailed analysis of the experimentally relevant case of
+bilayer graphene on a semiconducting transition metal dichalchogenide substrate
+is presented. In this system, a complete tunability of SOI amounting to its
+ON/OFF switching can be achieved. New opportunities for spin control are
+exemplified with electrically driven spin resonance and topological phases with
+different quantized intrinsic valley Hall conductivities.",1711.04407v1
+2018-07-21,Diffusion Monte Carlo methods for Spin-Orbit-Coupled ultracold Bose gases,"We present two Diffusion Monte Carlo (DMC) algorithms for systems of
+ultracold quantum gases featuring synthetic spin-orbit interactions. The first
+one is a discrete spin generalization of the T- moves spin-orbit DMC, which
+provides an upper bound to the fixed-phase energy. The second is a
+spin-integrated DMC method which recovers the fixed-phase property by avoiding
+the definition of the effective Hamiltonian involved in the T-moves approach.
+The latter is a more accurate method but it is restricted to spin-independent
+two-body interactions. We report a comparison between both algorithms for
+different systems. As a check of the efficiency of both methods, we compare the
+DMC energies with results obtained with other numerical methods, finding
+agreement between both estimation",1807.08123v2
+2020-03-16,Probing the singlet-triplet splitting in double quantum dots: Implications of the ac field amplitude,"We consider a double quantum dot whose energy detuning is controlled by an ac
+electric field. We demonstrate an energy configuration for which the ac-induced
+current flowing through the double dot directly probes the spin-orbit
+anticrossing point for small ac field amplitudes. On the contrary, as the ac
+amplitude increases a current antiresonance is formed, and the direct
+information about the spin-orbit interaction is lost. This result indicates
+that a large ac amplitude is not necessarily advantageous for the spectroscopy
+of spin-orbit coupled two-spin states. Moreover, we investigate the ac-induced
+current peaks versus the ac amplitude and show a current suppression when the
+ac field forms spin blocked states. This effect gives rise to a characteristic
+pattern for the current which can be controlled at will by tuning the ac
+amplitude. Our results can be explored by performing electronic transport
+measurements in the spin blockade regime.",2003.07056v1
+2020-03-25,Gravitational spin-orbit coupling through third-subleading post-Newtonian order: from first-order self-force to arbitrary mass ratios,"Exploiting simple yet remarkable properties of relativistic gravitational
+scattering, we use first-order self-force (linear-in-mass-ratio) results to
+obtain arbitrary-mass-ratio results for the complete third-subleading
+post-Newtonian (4.5PN) corrections to the spin-orbit sector of spinning-binary
+conservative dynamics, for generic (bound or unbound) orbits and spin
+orientations. We thereby improve important ingredients of models of
+gravitational waves from spinning binaries, and we demonstrate the improvement
+in accuracy by comparing against aligned-spin numerical simulations of binary
+black holes.",2003.11391v2
+2021-12-30,Majorana chiral spin liquid in Mott insulating cuprates,"The large thermal Hall conductivity recently detected in Mott insulating
+cuprates has been attributed to chiral neutral spin excitations. A quantum spin
+liquid with Majorana excitations, Chern number +/-4 and large thermal Hall
+conductivity is found to be an excited state of a frustrated Heisenberg model
+on the square lattice. Using a Majorana mean-field theory and exact
+diagonalizations, we explore two possible routes to achieve this chiral quantum
+spin liquid, an orbital effect of an applied magnetic field and spin orbit
+couplings as present in cuprates. In particular, we show how only the orbital
+magnetic field allows this topological phase to be the ground state, while it
+remains an excited state of the Majorana mean field under the
+Dzyaloshinskii-Moriya terms. We interpret the large thermal Hall effect
+observed in Mott cuprates from their close proximity to a transition to a
+Majorana chiral quantum spin liquid which can be induced by an external
+magnetic field.",2112.14991v1
+2022-10-05,Spin current and chirality degrees of freedom inherent in localized electron orbitals,"In solid state physics, any phase transition is commonly observed as a change
+in the microscopic distribution of charge, spin, or current. Here we report the
+nature of an exotic order parameter inherent in the localized electron orbitals
+that cannot be primarily captured by these three fundamental quantities. This
+order parameter is described as the electric toroidal multipoles connecting
+different total angular momenta under the spin-orbit coupling. The
+corresponding microscopic physical quantity is the spin current tensor on an
+atomic scale, which induces spin-derived electric polarization and the
+chirality of the Dirac equation. We stress that the chirality intrinsic to the
+elementary particle is the essence of electric toroidal multipoles. These
+findings link microscopic spin currents and chirality in the Dirac theory to
+the concept of multipoles and provide a new perspective for quantum states of
+matter.",2210.02148v1
+2017-09-21,Current-induced magnetization switching using electrically-insulating spin-torque generator,"Current-induced magnetization switching through spin-orbit torques (SOTs) is
+the fundamental building block of spin-orbitronics. The SOTs generally arise
+from the spin-orbit coupling of heavy metals. However, even in a
+heterostructure where a metallic magnet is sandwiched by two different
+insulators, a nonzero current-induced SOT is expected because of the broken
+inversion symmetry; an electrical insulator can be a spin-torque generator.
+Here, we demonstrate current-induced magnetization switching using an
+insulator. We show that oxygen incorporation into the most widely used
+spintronic material, Pt, turns the heavy metal into an electrically-insulating
+generator of the SOTs, enabling the electrical switching of perpendicular
+magnetization in a ferrimagnet sandwiched by electrically-insulating oxides. We
+further found that the SOTs generated from the Pt oxide can be controlled
+electrically through voltage-driven oxygen migration. These findings open a
+route towards energy-efficient, voltage-programmable spin-orbit devices based
+on solid-state switching of heavy metal oxidation.",1709.07127v1
+2014-07-22,Ground states and dynamics of spin-orbit-coupled Bose-Einstein condensates,"We study analytically and asymptotically as well as numerically ground states
+and dynamics of two-component spin-orbit-coupled Bose-Einstein condensates
+(BECs) modeled by the coupled Gross-Pitaevskii equations (CGPEs). In fact, due
+to the appearance of the spin-orbit (SO) coupling in the two-component BEC with
+a Raman coupling, the ground state structures and dynamical properties become
+very rich and complicated. For the ground states, we establish the existence
+and non-existence results under different parameter regimes, and obtain their
+limiting behaviors and/or structures with different combinations of the SO and
+Raman coupling strengths. For the dynamics, we show that the motion of the
+center-of-mass is either non-periodic or with different frequency to the
+trapping frequency when the external trapping potential is taken as harmonic
+and the initial data is chosen as a stationary state (e.g. ground state) with a
+shift, which is completely different from the case of a two-component BEC
+without the SO coupling, and obtain the semiclassical limit of the CGPEs in the
+linear case via the Wigner transform method. Efficient and accurate numerical
+methods are proposed for computing the ground states and dynamics, especially
+for the case of box potentials. Numerical results are reported to demonstrate
+the efficiency and accuracy of the numerical methods and show the rich
+phenomenon in the SO-coupled BECs.",1407.5815v1
+2023-11-05,Topological spin-orbit-coupled fermions beyond rotating wave approximation,"The realization of spin-orbit-coupled ultracold gases has driven a wide range
+of researches and is typically based on the rotating wave approximation (RWA).
+By neglecting the counter-rotating terms, RWA characterizes a single
+near-resonant spin-orbit (SO) coupling in a two-level system. Here, we propose
+and experimentally realize a new scheme for achieving a pair of two-dimensional
+(2D) SO couplings for ultracold fermions beyond RWA. This work not only
+realizes the first anomalous Floquet topological Fermi gas beyond RWA, but also
+significantly improves the lifetime of the 2D-SO-coupled Fermi gas. Based on
+pump-probe quench measurements, we observe a deterministic phase relation
+between two sets of SO couplings, which is characteristic for our beyond-RWA
+scheme and enables the two SO couplings to be simultaneously tuned to the
+optimum 2D configurations. We observe intriguing band topology by measuring
+two-ring band-inversion surfaces, quantitatively consistent with a Floquet
+topological Fermi gas in the regime of high Chern numbers. Our study can open
+an avenue to explore exotic SO physics and anomalous topological states based
+on long-lived SO-coupled ultracold fermions.",2311.02584v1
+2005-12-09,Molecular orbital calculations of two-electron states for P donor solid-state spin qubits,"We theoretically study the Hilbert space structure of two neighbouring P
+donor electrons in silicon-based quantum computer architectures. To use
+electron spins as qubits, a crucial condition is the isolation of the electron
+spins from their environment, including the electronic orbital degrees of
+freedom. We provide detailed electronic structure calculations of both the
+single donor electron wave function and the two-electron pair wave function. We
+adopted a molecular orbital method for the two-electron problem, forming a
+basis with the calculated single donor electron orbitals. Our two-electron
+basis contains many singlet and triplet orbital excited states, in addition to
+the two simple ground state singlet and triplet orbitals usually used in the
+Heitler-London approximation to describe the two-electron donor pair wave
+function. We determined the excitation spectrum of the two-donor system, and
+study its dependence on strain, lattice position and inter donor separation.
+This allows us to determine how isolated the ground state singlet and triplet
+orbitals are from the rest of the excited state Hilbert space. In addition to
+calculating the energy spectrum, we are also able to evaluate the exchange
+coupling between the two donor electrons, and the double occupancy probability
+that both electrons will reside on the same P donor. These two quantities are
+very important for logical operations in solid-state quantum computing devices,
+as a large exchange coupling achieves faster gating times, whilst the magnitude
+of the double occupancy probability can affect the error rate.",0512200v1
+2004-01-09,The precession of orbital plane and the significant variabilities of binary pulsars,"There are two kinds of expressions on the precession of orbital plane of a
+binary pulsar system, which are given by Barker $&$ O'Connell (1975) and
+Apostolatos et al. (1994), Kidder (1995) respectively. This paper points out
+that these two kinds of orbital precession velocities are actually obtained by
+the same Lagrangian under different degrees of freedom. Correspondingly the
+former expression is not consistent with the conservation of the total angular
+momentum vector; whereas the latter one is. Damour $&$ Sch\""afer (1988) and Wex
+$&$ Kopeikin (1999) have applied Barker $&$ O'Connell's orbital precession
+velocity in pulsar timing measurement. This paper applies Apostolatos et al.
+$&$ Kidder's orbital precession velocity in pulsar timing measurement. We
+analyze that Damour $&$ Sch\""afer's treatment corresponds to negligible
+Spin-Orbit induced precession of periastron. Whereas the effects corresponding
+to Wex $&$ Kopeikin and this paper are both significant (however they are not
+equivalent). The observational data of two typical binary pulsars, PSR
+J2051-0827 and PSR J1713+0747 apparently support significant Spin-Orbit
+coupling effect. Further more, the discrepancies between Wex $&$ Kopeikin and
+this paper can be tested on specific binary pulsars with orbital plane nearly
+edge on. If the orbital period derivative of double-pulsar system PSRs
+J0737-3039 A and B, with orbital inclination angle $i=87.7_{-29}^{+17}$deg, is
+much larger than that of the gravitational radiation induced one, then the
+expression of this paper is supported, otherwise Wex $&$ Kopeikin's expression
+is supported.",0401152v8
+2023-07-08,Ultrathin films of black phosphorus as suitable platforms for unambiguous observation of the orbital Hall effect,"Phosphorene, a monolayer of black phosphorus, is a two-dimensional material
+that lacks a multivalley structure in the Brillouin zone and has negligible
+spin-orbit coupling. This makes it a promising candidate for investigating the
+orbital Hall effect independently of the valley or spin Hall effects. To model
+phosphorene, we utilized a DFT-derived tight-binding Hamiltonian, which is
+constructed with the pseudo atomic orbital projection method. For that purpose,
+we use the PAOFLOW code with a newly implemented internal basis that provides a
+fairly good description of the phosphorene conduction bands. By employing
+linear response theory, we show that phosphorene exhibits a sizable orbital
+Hall effect with strong anisotropy in the orbital Hall conductivity for the
+out-of-plane orbital angular momentum component. The magnitude and sign of the
+conductivity depend upon the in-plane direction of the applied electric field.
+These distinctive features enable the observation of the orbital Hall effect in
+this material unambiguously. The effects of strain and of a perpendicularly
+applied electric field on the phosphorene orbital-Hall response are also
+explored. We show that a supplementary electric field applied perpendicular to
+the phosphorene layer in its conductive regime gives rise to an induced
+in-plane orbital magnetization.",2307.03866v2
+1996-09-17,A topological characterization of delocalization in a spin-orbit coupling system,"We show that wavefunctions in a two-dimensional (2D) electron system with
+spin-orbit coupling can be characterized by a topological quantity--the Chern
+integer due to the existence of the intrinsic Kramers degeneracy. The
+localization-delocalization transition in such a system is studied in terms of
+such a Chern number description, which reproduces the known metal-insulator
+transition point. The present work suggests a unified picture for various known
+2D delocalization phenomena based on the same topological characterization.",9609147v1
+1999-06-06,Level statistics in a two-dimensional system with strong spin-orbit coupling,"We study level correlations in a two-dimensional system with a long-range
+random potential and strong spin-orbit (SO) splitting of the spectrum. The
+level correlations for sufficiently large splitting are shown to be described
+by orthogonal Wigner-Dyson statistics, in contrast to the common point of view
+that a system with the strong SO coupling belongs to the symplectic statistical
+ensemble. We demonstrate also that in a wide energy interval the level
+statistics is completely determined by transitions between two branches of the
+split spectrum. A sharp resonance is obtained in the two-level correlation
+function at energy equal to the value of SO splitting.",9906086v1
+1999-08-31,Critical Quantum Chaos in 2D Disordered Systems with Spin-Orbit Coupling,"We examine the validity of the recently proposed semi-Poisson level spacing
+distribution function P(S), which characterizes `critical quantum chaos', in 2D
+disordered systems with spin-orbit coupling. At the Anderson transition we show
+that the semi-Poisson P(S) can describe closely the critical distribution
+obtained with averaged boundary conditions, over Dirichlet in one direction
+with periodic in the other and Dirichlet in both directions. We also obtain a
+sub-Poisson linear number variance $\Sigma_{2}(E)\approx \chi_{0}+ \chi E$,
+with asymptotic value $\chi\approx0.07$. The obtained critical statistics,
+intermediate between Wigner and Poisson, is relevant for disordered systems and
+chaotic models.",9908484v1
+2002-04-25,The Anderson Transition in Two-Dimensional Systems with Spin-Orbit Coupling,"We report a numerical investigation of the Anderson transition in
+two-dimensional systems with spin-orbit coupling. An accurate estimate of the
+critical exponent $\nu$ for the divergence of the localization length in this
+universality class has to our knowledge not been reported in the literature.
+Here we analyse the SU(2) model. We find that for this model corrections to
+scaling due to irrelevant scaling variables may be neglected permitting an
+accurate estimate of the exponent $\nu=2.73 \pm 0.02$.",0204544v3
+2003-03-11,Electronic structure of the V3+ ion in V2O3,"We have attributed magnetism and electronic structure of V2O3 to the V3+
+ions. We claim that the V3+ ion in V2O3 should be considered as described by
+the quantum numbers S=1 and L=3. Such quantum numbers result from two Hund's
+rules. The resulting electronic structure is much more complex than considered
+up to now, but it describes, e.g. the insulating ground state and the lowered
+magnetic moment, of 1.2 \muB. It turns out that the intra-atomic spin-orbit
+coupling is indispensable for the physically adequate description of electronic
+and magnetic properties of V2O3.
+  Keywords: highly-correlated electron system, crystal field, V3+ ion,
+spin-orbit coupling, Mott insulators
+  PACS: 71.70.E, 75.10.D, 75.30.Gw",0303194v1
+2004-04-27,Numerical estimation of the $β$-function in 2D systems with spin-orbit coupling,"We report a numerical study of Anderson localization in a 2D system of
+non-interacting electrons with spin-orbit coupling. We analyze the scaling of
+the renormalized localization length for the 2D SU(2) model and estimate its
+$\beta$-function over the full range from the localized to the metallic limits.",0404630v2
+2005-12-26,Current in a Spin-orbit-coupling System,"The formulae of particle current as well as spin- and angular momentum
+currents are studied for most spin-orbit coupling (SOC) systems. It is shown
+that the conventional expression of currents in some literatures are not
+complete for some SOC systems. The particle current in Dresselhaus system must
+have extra terms in additional to the conventional one, but no extra term for
+Rashba, Luttinger model. Further more, we also prove that the extra terms of
+total angular momentum appear in Rashba current in addition to conventional
+one.",0512655v2
+2006-05-15,Charge transport in two dimensional electron gas/superconductor junctions with Rashba spin-orbit coupling,"We have studied the tunneling conductance in two dimensional electron gas /
+insulator / superconductor junctions in the presence of Rashba spin-orbit
+coupling (RSOC). It is found that for low insulating barrier the tunneling
+conductance is suppressed by the RSOC while for high insulating barrier it is
+almost independent of the RSOC. We also find the reentrant behavior of the
+conductance at zero voltage as a function of RSOC for intermediate insulating
+barrier strength. The results are essentially different from those predicted in
+ferromagnet / superconductor junctions. The present derivation of the
+conductance is applicable to arbitrary velocity operator with off-diagonal
+components.",0605372v1
+2006-09-22,Josephson current through a quantum dot with spin-orbit coupling,"The equilibrium Josephson current through a nanoscale multi-level quantum dot
+with Rashba or Dresselhaus spin-orbit coupling $\alpha$ has been computed. The
+critical current can be drastically modified already by moderate $\alpha$. In
+the presence of a Zeeman field, Datta-Das-like oscillatory dependencies on
+$\alpha$ are predicted.",0609577v2
+2006-11-14,Ideal switching effect in periodic spin-orbit coupling structures,"An ideal switching effect is discovered in a semiconductor nanowire with a
+spatially-periodic Rashba structure. Bistable `ON' and `OFF' states can be
+realized by tuning the gate voltage applied on the Rashba regions. The energy
+range and position of `OFF' states can be manipulated effectively by varying
+the strength of the spin-orbit coupling (SOC) and the unit length of the
+periodic structure, respectively. The switching effect of the nanowire is found
+to be tolerant of small random fluctuations of SOC strength in the periodic
+structure. This ideal switching effect might be applicable in future spintronic
+devices.",0611362v1
+2006-11-15,Tunneling anisotropic magnetoresistance and spin-orbit coupling in Fe/GaAs/Au tunnel junctions,"We report the observation of tunneling anisotropic magnetoresistance effect
+(TAMR) in the epitaxial metal-semiconductor system Fe/GaAs/Au. The observed
+two-fold anisotropy of the resistance can be switched by reversing the bias
+voltage, suggesting that the effect originates from the interference of the
+spin-orbit coupling at the interfaces. Corresponding model calculations
+reproduce the experimental findings very well.",0611406v1
+2007-02-22,Triplet pairing and upper critical field in the mixed state of d-wave superconductors,"We show that an additional triplet component of the order parameter is
+generated in the vortex phase of the d-wave superconductor. Spatial variations
+of the triplet component are analyzed for a strong spin-orbit coupling.
+Corrections to the London equation and an unusual temperature dependence of the
+upper critical field, are obtained in the case of the weak spin-orbit coupling.",0702523v2
+1993-04-08,BRS Cohomology of the Supertranslations in D=4,"Supersymmetry transformations are a kind of square root of spacetime
+translations. The corresponding Lie superalgebra always contains the
+supertranslation operator $ \delta = c^{\alpha} \sigma^{\mu}_{\alpha \dot
+\beta} {\overline c}^{\dot \beta} (\epsilon^{\mu})^{\dag} $. We find that the
+cohomology of this operator depends on a spin-orbit coupling in an SU(2) group
+and has a quite complicated structure. This spin-orbit type coupling will turn
+out to be basic in the cohomology of supersymmetric field theories in general.",9304035v1
+1999-01-28,Eleven-dimensional massless superparticles and matrix theory spin-orbit couplings revisited,"The classical probe dynamics of the eleven-dimensional massless
+superparticles in the background geometry produced by N source M-momenta is
+investigated in the framework of N-sector DLCQ supergravity. We expand the
+probe action up to the two fermion terms and find that the fermionic
+contributions are the spin-orbit couplings, which precisely agree with the
+matrix theory calculations. We comment on the lack of non-perturbative
+corrections in the one-loop matrix quantum mechanics effective action and its
+compatibility with the supergravity analysis.",9901152v1
+2007-04-17,Impact of spin-orbit coupling on quantum Hall nematic phases,"Anisotropic charge transport is observed in a two-dimensional (2D) hole
+system in a perpendicular magnetic field at filling factors nu=7/2, nu=11/2,
+and nu=13/2 at low temperature. In stark contrast, the transport at nu=9/2 is
+isotropic for all temperatures. Isotropic hole transport at nu=7/2 is restored
+for sufficiently low 2D densities or an asymmetric confining potential. The
+density and symmetry dependences of the observed anisotropies suggest that
+strong spin-orbit coupling in the hole system contributes to the unusual
+transport behavior.",0704.2215v1
+2007-05-07,Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics,"A simple but general microscopic mechanism to understand the interplay
+between the electric and magnetic degrees of freedom is developed. Within this
+mechanism, the magnetic structure generates an electric current which induce an
+counterbalance electric current from the spin orbital coupling. When the
+magnetic structure is described by a single order parameter, the electric
+polarization is determined by the single spin orbital coupling parameter, and
+the material is predicted to be a half insulator. This mechanism provides a
+simple estimation of the value of ferroelectricity and sets a physical
+limitation as well.",0705.0955v3
+2007-05-10,Evanescent states in quantum wires with Rashba spin-orbit coupling,"We discuss the calculation of evanescent states in quasi-one-dimensional
+quantum wires in the presence of Rashba spin-orbit interaction. We suggest a
+computational algorithm devised for cases in which longitudinal and transverse
+motions are coupled. The dispersion relations are given for some selected
+cases, illustrating the feasibility of the proposed computational method. As a
+practical application, we discuss the solutions for a wire containing a
+potential step.",0705.1506v1
+2008-04-14,Spin-orbit coupling in ferromagnetic Nickel,"We use the Gutzwiller variational theory to investigate the electronic and
+the magnetic properties of fcc-Nickel. Our particular focus is on the effects
+of the spin-orbit coupling. Unlike standard relativistic band-structure
+theories, we reproduce the experimental magnetic moment direction and we
+explain the change of the Fermi-surface topology that occurs when the magnetic
+moment direction is rotated by an external magnetic field. The Fermi surface in
+our calculation deviates from early de-Haas--van-Alphen (dHvA) results. We
+attribute these discrepancies to an incorrect interpretation of the raw dHvA
+data.",0804.2211v1
+2008-05-03,Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors,"In this article, I study magnetic response of electron wavefunctions in a
+commensurate collinear antiferromagnet. I show that, at a special set of
+momenta, hidden anti-unitary symmetry protects Kramers degeneracy of Bloch
+eigenstates against a magnetic field, pointing transversely to staggered
+magnetization. Hence a substantial momentum dependence of the transverse
+g-factor in the Zeeman term, turning the latter into a spin-orbit coupling,
+that may be present in materials from chromium to borocarbides, cuprates,
+pnictides, as well as organic and heavy fermion conductors.",0805.0378v2
+2008-05-12,Spin orbit coupling in bulk ZnO and GaN,"Using group theory and Kane-like $\mathbf{k\cdot p}$ model together with the
+L\""owdining partition method, we derive the expressions of spin-orbit coupling
+of electrons and holes, including the linear-$k$ Rashba term due to the
+intrinsic structure inversion asymmetry and the cubic-$k$ Dresselhaus term due
+to the bulk inversion asymmetry in wurtzite semiconductors. The coefficients of
+the electron and hole Dresselhaus terms of ZnO and GaN in wurtzite structure
+and GaN in zinc-blende structure are calculated using the nearest-neighbor
+$sp^3$ and $sp^3s^\ast$ tight-binding models separately.",0805.1577v2
+2008-08-03,Direct coupling between magnetism and superconducting current in Josephson Phi junction,"We study the proximity effect between conventional superconductor and
+magnetic normal metal with a spin-orbit interaction of the Rashba type. Using
+the phenomenological Ginzburg-Landau theory and the quasiclassical Eilenberger
+approach it is demonstrated that the Josephson junction with such a metal as a
+weak link has a special non-sinusoidal current-phase relation. The ground state
+of this junction is caracterized by the finite phase difference Phi, which is
+proportional to the strength of the spin-orbit interaction and the exchange
+field in the normal metal. The proposed mechanism of the Phi junction formation
+gives a direct coupling between the superconducting current and the magnetic
+moment in the weak link. Therefore the Phi junctions open interesting
+perspectives for the superconducting spintronics.",0808.0299v1
+2009-09-16,Anomalous Josephson current through a spin-orbit coupled quantum dot,"For a general model of a mesoscopic multi-level quantum dot, we determine the
+necessary conditions for the existence of an anomalous Josephson current with
+spontaneously broken time-reversal symmetry. They correspond to a finite
+spin-orbit coupling, a suitably oriented Zeeman field, and the dot being a
+chiral conductor. We provide analytical expressions for the anomalous
+supercurrent covering a wide parameter regime.",0909.3036v1
+2010-01-08,Spin-orbit coupling induced by a mass gradient,"The existence of a spin-orbit coupling (SOC) induced by the gradient of the
+effective mass in low-dimensional heterostructures is revealed. In structurally
+asymmetric quasi-two-dimensional semiconductor heterostructures the presence of
+a mass gradient across the interfaces results in a SOC which competes with the
+SOC created by the electric field in the valence band. However, in graded
+quantum wells subjected to an external electric field, the mass-gradient
+induced SOC can be finite even when the electric field in the valence band
+vanishes.",1001.1235v1
+2010-02-10,Spin-orbit coupling induced anisotropy effects in bimetallic antiferromagnets: A route towards antiferromagnetic spintronics,"Magnetic anisotropy phenomena in bimetallic antiferromagnets Mn$_2$Au and
+MnIr are studied by first-principles density functional theory calculations. We
+find strong and lattice-parameter dependent magnetic anisotropies of the ground
+state energy, chemical potential, and density of states, and attribute these
+anisotropies to combined effects of large moment on the Mn 3$d$ shell and large
+spin-orbit coupling on the 5$d$ shell of the noble metal. Large magnitudes of
+the proposed effects can open a route towards spintronics in compensated
+antiferromagnets without involving ferromagnetic elements.",1002.2151v1
+2010-04-05,Non-monotonic variation of anomalous Hall effect with spin orbit coupling strength,"For L1(0) FePt films, the anomalous Hall resistivity is found to be
+proportional to spontaneous magnetization $M_{\mathrm{S}}$. After the
+$M_{\mathrm{S}}$ temperature effect is eliminated, $\rho_{\mathrm{xyo}}$ can be
+fitted by $\rho_{\mathrm{xyo}}=a_{\mathrm{o}}\rho_{\mathrm{xx}}+
+b_{\mathrm{o}}\rho_{\mathrm{xx}}^{\mathrm{2}}$. $a_{\mathrm{o}}$ and
+$b_{\mathrm{o}}$ change non-monotonically with chemical long range ordering
+degree $S$. Accordingly, it is indicated that for L1(0) FePt films the spin
+orbit coupling strength increases monotonically with increasing $S$.",1004.0548v4
+2011-03-14,Topological superconducting phases in disordered quantum wires with strong spin-orbit coupling,"Zeeman fields can drive semiconductor quantum wires with strong spin-orbit
+coupling and in proximity to s-wave superconductors into a topological phase
+which supports end Majorana fermions and offers an attractive platform for
+realizing topological quantum information processing. Here, we investigate how
+potential disorder affects the topological phase by a combination of analytical
+and numerical approaches. Most prominently, we find that the robustness of the
+topological phase against disorder depends sensitively and non-monotonously on
+the Zeeman field applied to the wire.",1103.2746v2
+2011-04-21,Textures of Spin-Orbit Coupled F=2 Spinor Bose Einstein Condensates,"We study the textures of F=2 spinor Bose-Einstein condensates (BECs) with
+spin-orbit coupling (SOC) induced by a synthetic non-Abelian gauge field. On
+the basis of the analysis of the SOC energy and the numerical calculation of
+the Gross-Pitaevskii equation, we demonstrate that the textures originate from
+the helical modulation of the order parameter (OP) due to the SOC. In
+particular, the cyclic OP consists of two-dimensional lattice textures, such as
+the hexagonal lattice and the 1/3-vortex lattice, commonly understandable as
+the two-dimensional network of the helical modulations.",1104.4179v2
+2011-05-10,Spin-orbit coupling induced enhancement of superconductivity in a two-dimensional repulsive gas of fermions,"We study a model of a two-dimensional repulsive Fermi gas with Rashba
+spin-orbit coupling $\alpha_R$, and investigate the superconducting instability
+using renormalization group approach. We find that in general superconductivity
+is enhanced as the dimensionless ratio 1/2m\alpha_R^2/E_F$ increases, resulting
+in unconventional superconducting states which break time reversal symmetry.",1105.2041v2
+2011-06-09,Majorana fermions in spin-orbit coupled ferromagnetic Josephson junctions,"We study all possible Majorana modes in two-dimensional spin-orbit coupled
+ferromagnetic superconductor-normal state-superconductor (SNS) Josephson
+junctions and propose experiments to detect them. With the S region in a
+non-trivial topological phase and a superconducting phase difference $\phi =
+\pi$ across the junction, two delocalized Majorana fermions with no excitation
+gap appear in the N region. In addition, if S and N belong to different
+topological phases and have well-separated the Fermi surfaces, localized
+Majorana fermions with a finite excitation gap also emerge at both SN
+interfaces for all $\phi$.",1106.1801v2
+2012-03-03,Scaling of intrinsic Gilbert damping with spin-orbital coupling strength,"We have experimentally and theoretically investigated the dependence of the
+intrinsic Gilbert damping parameter $\alpha_0$ on the spin-orbital coupling
+strength $\xi$ by using L1$_{\mathrm{0}}$ ordered
+FePd$_{\mathrm{1-x}}$Pt$_{\mathrm{x}}$ ternary alloy films with perpendicular
+magnetic anisotropy. With the time-resolved magneto-optical Kerr effect,
+$\alpha_0$ is found to increase by more than a factor of ten when $x$ varies
+from 0 to 1.0. Since changes of other leading parameters are found to be
+neglected, the $\alpha_0$ has for the first time been proven to be proportional
+to $\xi^2$.",1203.0607v1
+2012-08-08,"Electronic band structure, Fermi surface and effect of spin-orbit coupling for tetragonal low-temperature superconductor Bi2Pd from first principles","We have examined theoretically the electronic band structure and Fermi
+surface of tetragonal low-temperature superconductor Bi2Pd. Our main results
+are that (i) the Pd 4d and Bi 6p states determine the main peculiarities of the
+multiple-sheets FS topology, thus for this material the complicated
+superconducting gap structure with different energy gaps on different FS sheets
+should be assumed; (ii) the effect of the spin-orbit coupling is of minor
+importance for the distributions of the near-Fermi electronic states; and (iii)
+this phase adopts 3D-like type owing to the directional bonds between the
+adjacent atomic sheets.",1208.1633v1
+2012-09-14,An electronic model for self-assembled hybrid organic/perovskite semiconductors: reverse band edge electronic states ordering and spin-orbit coupling,"Based on density functional theory, the electronic and optical properties of
+hybrid organic/perovskite crystals are thoroughly investigated. We consider the
+mono-crystalline 4FPEPI as material model and demonstrate the optical process
+is governed by three active Bloch states at the {\Gamma} point of the reduced
+Brillouin zone with a reverse ordering compared to tetrahedrally bonded
+semiconductors. Giant spin-orbit coupling effects and optical activities are
+subsequently inferred from symmetry analysis.",1209.3195v1
+2012-11-22,Observation of Phonon-Assisted Magnon Absorption in Spin-Orbit Coupling Induced Mott Insulator Sr$_{2}$IrO$_{4}$,"The infrared transmission measurement was performed for a two-dimensional
+spin-orbit coupling induced Mott insulator Sr$_{2}$IrO$_{4}$ with a
+layered-perovskite structure. A phonon-assisted magnon mode was observed at
+around 1870 cm$^{-1}$ in the absorption spectrum below 180 K. The
+nearest-neighbor superexchange interaction $J$ was estimated to be 57 meV,
+which is about a half of the $J$ value of a copper oxide La$_{2}$CuO$_{4}$. Our
+results indicate the possibility that nontrivial properties such as
+superconductivity are realized at rather high temperature in iridium oxides.",1211.5241v2
+2012-12-14,Single-branch theory of ultracold Fermi gases with artificial Rashba spin-orbit coupling,"We consider interacting ultracold fermions subject to Rashba spin-orbit
+coupling. We construct a single-branch interacting theory for the Fermi gas
+when the system is dilute enough so that the positive helicity branch is not
+occupied at all in the non-interacting ground state. We show that the theory is
+renormalizable in perturbation theory and therefore yields a model of polarized
+fermions that avoids a multi-channel treatment of the problem. Our results open
+the path towards a much more straightforward approach to the many-body physics
+of cold atoms subject to artificial vector potentials.",1212.3565v1
+2012-12-26,Electron Correlation Induced Spontaneous Symmetry Breaking and Weyl Semimetal Phase in a Strongly Spin-Orbit Coupled System,"We study theoretically the electron correlation effect in a three-dimensional
+Dirac fermion system which describes a topologically nontrivial state. It is
+shown within the mean-field approximation that time-reversal and inversion
+symmetries of the system are spontaneously broken in the region where both
+spin-orbit coupling and electron correlation are strong. This phase is
+considered as an analog of that in the lattice quantum chromodynamics. It is
+also shown that in the presence of magnetic impurities, electron correlation
+enhances the appearance of the Weyl semimetal phase between the topological
+insulator phase and the normal insulator phase.",1212.6218v1
+2013-02-05,Fulde-Ferrell Pairing instability in Spin-Orbit Coupled Fermi Gas,"We consider finite-momentum pairing of superfluid phase in ultracold Fermi
+gas with spin-orbit coupling when subjected to an effective Zeeman field. Based
+on our two body and mean field many body calculations, we show that the
+Fulde-Ferrell type superfluid dominates in zero and finite temperature phase
+diagram. We examine the origin and properties of this novel phase
+systematically.",1302.1189v2
+2013-03-14,Spin-orbit interactions in a helical Luttinger liquid with a Kondo impurity,"The combined effect of Rashba and Dresselhaus spin-orbit interactions on the
+physics of a helical Luttinger liquid coupled to a Kondo impurity is studied. A
+Rashba coupling can potentially destroy the Kondo singlet formation in certain
+parameter regimes [Phys. Rev. B 86, 161103(R) (2012)]. This effect is here
+shown to vanish for sufficiently strong Dresselhaus interaction. The transport
+properties of the system are investigated by calculating electrical
+conductance, current and current fluctuations, and thermal conductance.",1303.3558v3
+2013-04-01,Fulde-Ferrell superfluidity in ultracold Fermi gases with Rashba spin-orbit coupling,"We theoretically investigate the inhomogeneous Fulde-Ferrell (FF)
+superfluidity in a three dimensional atomic Fermi gas with Rashba spin-orbit
+coupling near a broad Feshbach resonance. We show that within mean-field theory
+the FF superfluid state is always more favorable than the standard
+Bardeen-Cooper-Schrieffer (BCS) superfluid state when an in-plane Zeeman field
+is applied. We present a qualitative finite-temperature phase diagram near
+resonance and argue that the predicted FF superfluid is observable with
+experimentally attainable temperatures (i.e., $T\sim0.2T_{F}$, where $T_{F}$ is
+the characteristic Fermi degenerate temperature).",1304.0387v2
+2013-04-04,Spin-orbit coupling induced Fulde-Ferrell-Larkin-Ovchinnikov-like Cooper pairing and skyrmion-like polarization textures in trapped optical lattices,"We study the interplay between the Zeeman field and spin-orbit coupling (SOC)
+in harmonically trapped Fermi gases loaded into a two-dimensional single-band
+tight-binding optical lattice. Using the Bogoliubov-de Gennes theory, we find
+that the Zeeman field combined with a Rashba SOC gives rise to $(i)$
+Fulde-Ferrell-like superfluidity and $(ii)$ skyrmion-like polarization textures
+near the edges of the system. We also discussed the effects of interaction,
+temperature, SOC anisotropy and Zeeman field anisotropy on the superfluid
+ground state and polarization textures.",1304.1473v2
+2013-04-27,Valley-Polarized Quantum Anomalous-Hall Effects in Silicene,"We demonstrate a new quantum state of matter---valley-polarized quantum
+anomalous Hall effect in monolayer silicene. In the presence of extrinsic
+Rashba spin-orbit coupling and exchange field, monolayer silicene can host a
+quantum anomalous-Hall state with Chern number C=2. We find that through tuning
+Rashba spin-orbit coupling, a topological phase transition gives rise to a
+valley polarized quantum anomalous Hall state, i.e. a quantum state which
+exhibits electronic properties of both quantum valley-Hall effect (valley Chern
+number C_V=3) and quantum anomalous Hall effect with C=-1.",1304.8076v1
+2013-12-23,"Reply to Comment on ""Quantum quasicrystals of spin-orbit coupled dipolar bosons''","In a recent Letter [Phys. Rev. Lett. 111, 185304 (2013)], we proposed a
+scheme for realizing quantum quasicrystals using spin-orbit coupled dipolar
+bosons. We remarked that these quantum quasicrystals have additional
+``phason''-like modes compared with their classical counterparts. A recent
+comment by Lifshitz [arXiv:1312.1388] contests this claim. We argue here that
+our enumeration of gapless modes is indeed the physically relevant one; whether
+the additional modes are ``phasons'' is, however, a matter of definition.",1312.6452v1
+2014-01-23,Spin-Orbit Coupling in Deformed Harmonic Traps,"We consider a two-dimensional system of harmonically trapped particles with
+pseudo-spin-$\frac{1}{2}$ degree of freedom. This degree of freedom is coupled
+to the particle's momentum via the so-called Rashba spin-orbit interaction. We
+present our numerical results for a single-particle and few-particle systems,
+assuming the repulsive interparticle interaction to be of zero range.",1401.5914v1
+2014-08-18,Spin Orbit coupling and Anomalous Josephson effect in Nanowires,"A superconductor-semiconducting nanowire-superconductor heterostructure in
+the presence of spin orbit coupling and magnetic field can support a
+supercurrent even in the absence of phase difference between the
+superconducting electrodes. We investigate this phenomenon, the anomalous
+Josephson effect, employing a model capable of describing many bands in the
+normal region. We discuss geometrical and symmetry conditions required to have
+finite anomalous supercurrent and in particular we show that this phenomenon is
+enhanced when the Fermi level is located close to a band opening in the normal
+region.",1408.3953v2
+2014-11-12,Antiferromagnetic Order in a Spin-Orbit Coupled Bose-Einstein Condensate,"Spin-orbit coupling related new physics and quantum magnetism are two
+branches of great interest both in condensed matter physics and in cold atomic
+physics. With the introduction of a Rashba-like SOC into a Bose-Einstein
+condensate (BEC) loaded in a two-dimensional bipartite optical square lattice,
+we find that the ground state of the BEC always favors a coherent condensate
+than a fragmented condensate and always exhibits very large degeneracy, and
+most importantly, an antiferromagnetic order of quantum nature emerges when
+parameters satisfy certain condition. This provides an ideal platform to study
+the interplay of antiferromagnetic phase and superfluid phase.",1411.3216v1
+2014-11-17,Chiral zero modes in superconducting nanowires with Dresselhaus spin-orbit coupling,"Using chiral decomposition, we are able to find analytically the zero modes
+and the conditions for such modes to exist in the Kitaev ladder model and
+superconducting nanowires with Dresselhaus spin-orbit coupling. As a result, we
+are able to calculate the number of zero modes in these systems for arbitrary
+given parameters in the semi-infinite limit. Moreover, we find that when
+suitable resonance condition is satisfied exact zero modes exist even in finite
+systems contrary to the common belief.",1411.4393v1
+2014-11-22,Fidelity Approach in Topological Superconductors with Disorders,"We apply the fidelity approach to study the topological superconductivity in
+a spin-orbit coupled nanowire system. The wire is modeled as a one layer
+lattice chain with Zeeman energy and spin-orbit coupling, which is in proximity
+to a multi layer superconductor. In particular, we study the effects of
+disorders and find that the fidelity susceptibility show multiple peaks. It is
+revealed that the major peak indicates the topological quantum phase
+transition, while other peaks signal the pining of the Majorana bound states by
+disorders.",1411.6101v1
+2015-01-06,Spontaneous symmetry breaking in a spin-orbit coupled $f=2$ spinor condensate,"We study the ground-state density profile of a spin-orbit coupled $f=2$
+spinor condensate in a quasi-one-dimensional trap. The Hamiltonian of the
+system is invariant under time reversal but not under parity. We identify
+different parity- and time-reversal-symmetry-breaking states. The
+time-reversal-symmetry breaking is possible for degenerate states. A phase
+separation among densities of different components is possible in the domain of
+time-reversal-symmetry breaking. Different types of parity- and
+time-reversal-symmetry-breaking states are predicted analytically and studied
+numerically. We employ numerical and approximate analytic solutions of a
+mean-field model in this investigation to illustrate our findings.",1501.01164v1
+2015-02-16,Quasiclassical theory of disordered Rashba superconductors,"We derive the quasiclassical equations that describe two-dimensional
+superconductors with a large Rashba spin-orbit coupling and in the presence of
+impurities. These equations account for the helical phase induced by an
+in-plane magnetic field, with a superconducting order parameter that is
+spatially modulated along a direction perpendicular to the field. We also
+derive the generalized Ginzburg-Landau functional, which includes a
+linear-in-gradient term corresponding to the helical phase. This theory paves
+the way for studies of the proximity effect in two-dimensional electron gases
+with large spin-orbit coupling.",1502.04504v2
+2015-02-17,Magnetotransport in disordered two-dimensional topological insulators: signatures of charge puddles,"In this numerical study we investigate the influence and interplay of
+disorder, spin-orbit coupling and magnetic field on the edge-transport in
+HgTe/CdTe quantum wells in the framework of coherent elastic scattering. We
+show that the edge states remain unaffected by the combined effect of moderate
+disorder and a weak magnetic field at realistic spin-orbit coupling strengths.
+Agreement with the experimentally observed linear magnetic field dependence for
+the conductance of long samples is obtained when considering the existence of
+charge puddles.",1502.04919v1
+2015-04-03,Quantum mechanics of a spin-orbit coupled electron constrained to a space curve,"We derive the effective one-dimensional Schrodinger-Pauli equation for
+electrons constrained to move on a space curve. The electrons are confined
+using a double thin-wall quantization procedure with adiabatic separation of
+fast and slow quantum degrees of freedom. This procedure is capable of yielding
+a correct Hermitian one-dimensional Schrodinger-Pauli operator. We find that
+the torsion of the space curve generates an additional quantum geometric
+potential, adding to the well-known curvature-induced one. Finally, we derive
+an analytic form of the one-dimensional Hamiltonian for spin-orbit coupled
+electrons in a nanoscale helical wire.",1504.00840v1
+2015-04-23,Fluctuation Theory of Rashba Fermi Gases,"Fermi gases with generalized Rashba spin orbit coupling inducedby a synthetic
+gauge field have the potential of realizing many interesting states such as
+rashbon condensates and topological phases. Here we develop a fluctuation
+theory of such systems and demonstrate that beyond-Gaussian effects are
+essential to capture the physics of such systems. We obtain their phase diagram
+by constructing an approximate non-Gaussian theory. We conclusively establish
+that spin-orbit coupling can enhance the exponentially small transition
+temperature ($T_c$) of a weakly attracting superfluid to the order of Fermi
+temperature, paving a pathway towards high $T_c$ superfluids.",1504.06022v1
+2015-04-28,"""Switching"" of Magnetic Anisotropy in a fcc Antiferromagnet with Direction-Dependent Interactions","Direction-dependent anisotropic exchange is a common feature of magnetic
+systems with strong spin-orbit coupling. Here we study the effect of such
+exchange upon macroscopic magnetic anisotropy for a face-centered-cubic model.
+By several theoretical techniques, we show that, both in the paramagnetic and
+ordered phases, the magnetic anisotropy is induced by fluctuations. Moreover,
+the magnetic anisotropy differs in the paramagnetic and ordered phases: in the
+paramagnetic phase the susceptibility is maximum along the $\langle111\rangle$
+directions, while the magnetic moments orient along $\langle110\rangle$ or
+$\langle100\rangle$ in the ordered phase. We suggest that such ""anisotropy
+switching"" can be a common feature of strongly spin-orbit coupled magnets.",1504.07607v1
+2015-11-13,Spin-Orbit Coupling Parameters of sp2 Nanocarbons,"The paper presents a new approach to the determination of standard spin-orbit
+coupling parameters, such as the SOC constant a_SO and the Lande parameter g,
+by using peculiarities of UHF results for open-shell systems. The approach is
+convincingly approved for stretched ethylene and fullerene C60 as examples,
+thus justifying at once a high efficacy of the UHF formalism to disclose SOC
+features.",1511.04327v1
+2016-01-20,Quantum Transport of Dirac fermions in graphene with a spatially varying Rashba spin-orbit coupling,"We theoretically study electronic transport through a region with
+inhomogeneous Rashba spin-orbit (RSO) coupling placed between two normal
+regions in a monolayer graphene. The inhomogeneous RSO region is characterized
+by linearly varying RSO strength within its borders and constant RSO strength
+in the central region. We calculate the transmission properties within the
+transfer matrix approach. It is shown that the amplitude of conductance
+oscillations reduces and at the same time the magnitude of conductance
+increases with increasing border thickness. We also investigate how the Fano
+factor can be modified by the border thickness of RSO region.",1601.05276v1
+2019-05-23,First order Fermi surface topological (Lifshitz) transition in an interacting two-dimensional Rashba Fermi liquid,"We study the Fermi surface topological transition of the pocket-opening type
+in a two dimensional Fermi liquid with spin-orbit coupling of Rashba type. We
+find that the interactions, far from instabilities, drive the transition first
+order at zero temperature surprisingly in a more pronounced way than in the
+case of interacting Fermi liquid without spin-orbit coupling. We first gain
+insight from second order perturbation theory in the self-energy. We then
+extend the results to stronger interaction, using the self-consistent
+fluctuation approximation. We discuss existing experimental work on the system
+BiTeI and suggest further experiments in the light of these results .",1905.09941v2
+2010-05-03,Effects of interface spin-orbit coupling on tunneling between normal metal and chiral p-wave superconductor,"We study the tunneling conductance of a clean normal metal/chiral p-wave
+superconductor junction using the extended Blonder-Tinkham-Klapwijk formalism.
+It is shown that the spin-orbit coupling of the Rashba type that is present
+near the interface causes the subgap conductance peaks associated with the
+Andreev surface bound states to shift to a nonzero bias. We also investigate
+the effect of the Fermi wavevector mismatch between the normal metal and the
+superconductor.",1005.0370v1
+2013-08-19,Spirals and skyrmions in two dimensional oxide heterostructures,"We construct the general free energy governing long-wavelength magnetism in
+two-dimensional oxide heterostructures, which applies irrespective of the
+microscopic mechanism for magnetism. This leads, in the relevant regime of weak
+but non-negligible spin-orbit coupling, to a rich phase diagram containing
+in-plane ferromagnetic, spiral, cone, and skyrmion lattice phases, as well as a
+nematic state stabilized by thermal fluctuations. The general conclusions are
+vetted by a microscopic derivation for a simple model with Rashba spin-orbit
+coupling.",1308.4179v2
+2017-04-13,Spontaneous currents in superconducting systems with strong spin-orbit coupling,"We show that Rashba spin-orbit coupling at the interface between a
+superconductor and a ferromagnet should produce a spontaneous current in the
+atomic thickness region near the interface. This current is counter-balanced by
+the superconducting screening current flowing in the region of the width of the
+London penetration depth near the interface. Such current carrying state
+creates a magnetic field near the superconductor surface, generates a stray
+magnetic field outside the sample edges, changes the slope of the temperature
+dependence of the critical field $H_{c3}$ and may generate the spontaneous
+Abrikosov vortices near the interface.",1704.04123v1
+2008-07-11,Breakdown of half-metallic ferromagnetism in zinc-blende II-V compounds,"We investigated the electronic and magnetic properties of a series of
+zinc-blend II-V compounds by carrying out density-functional-theory
+calculations including spin-orbit couplings. Contrary to the case of CaN and
+CaP, the half-metallic characteristics of the II-V compounds such as CaSb and
+CaBi were found to be destroyed. Our analysis of the valence band structures of
+CaAs, CaSb, and CaBi revealed a critical role of the spin-orbit coupling
+interactions on the exchange-split band structure, thereby leading to breakdown
+of the half-metallic ferromagnetism for the systems with heavier group V
+elements in the zinc-blend II-V compounds.",0807.1778v1
+2012-04-15,Stabilizing topological phases in graphene via random adsorption,"We study the possibility of realizing topological phases in graphene with
+randomly distributed adsorbates. When graphene is subjected to periodically
+distributed adatoms, the enhanced spin-orbit couplings can result in various
+topological phases. However, at certain adatom coverages, the intervalley
+scattering renders the system a trivial insulator. By employing a finite-size
+scaling approach and Landauer-B\""{u}ttiker formula, we show that the
+randomization of adatom distribution greatly weakens the intervalley
+scattering, but plays a negligible role in spin-orbit couplings. Consequently,
+such a randomization turns graphene from a trivial insulator into a topological
+state.",1204.3276v1
+2013-09-03,Bose-Einstein Condensates with Cavity-Mediated Spin-Orbit Coupling,"We propose a novel scheme to generate the spin-orbit coupling for a
+condensate placed inside an optical cavity by using a standing wave and a
+traveling wave. It is shown that the interplay of the laser lights and the
+cavity gives rise to rich quantum phases. Our scheme also generates an
+nontrivial lattice of the magnetic flux, which may facilitate the study of the
+exotic quantum phases.",1309.0606v1
+2016-05-23,Large magnetic anisotropy in Fe_{0.25}TaS_2,"We present a first-principles study of the large magneto-crystalline
+anisotropy in the intercalated di-chalcogenide material \ce{Fe_{0.25}TaS_2},
+investigated with the DFT+U approach. We verify a uniaxial magnetocrystalline
+anisotropy energy(MAE) of 15meV/Fe. in the material. We further analyze the
+dependence of MAE on the constituent elements and the effect of spin-orbit
+coupling. Contrary to conventional intuition, we find a small contribution to
+MAE due to strong spin-orbit coupling in the heavier element, Ta. We show that
+the electronic configuration, crystal field environment and correlational
+effects of the magnetic ion are more important.",1605.07141v1
+2017-06-29,Three-Dimensional Fractional Topological Insulators in Coupled Rashba Layers,"We propose a model of three-dimensional topological insulators consisting of
+weakly coupled electron- and hole-gas layers with Rashba spin-orbit interaction
+stacked along a given axis. We show that in the presence of strong
+electron-electron interactions the system realizes a fractional strong
+topological insulator, where the rotational symmetry and condensation energy
+arguments still allow us to treat the problem as quasi-one-dimensional with
+bosonization techniques. We also show that if Rashba and Dresselhaus spin-orbit
+interaction terms are equally strong, by doping the system with magnetic
+impurities, one can bring it into the Weyl semimetal phase.",1706.09863v1
+2018-09-22,Modulation instability associated nonlinear dynamics of spin-orbit coupled Bose-Einstein condensates,"We study pattern-forming nonlinear dynamics starting from a continuous wave
+state of quasi-one-dimensional two-component Bose-Einstein condensates with
+synthetic spin-orbit coupling induced by Raman lasers. Modulation instability
+can occur even when the miscibility condition due to the interatomic
+interactions is satisfied. We find that the initial stage of the nonlinear
+development is consistent with the prediction of modulation instability, where
+the two primary and secondary instability bands lead to the spontaneous growth
+of the modulation and the subsequent complicated dynamics of pattern formation.
+At later stages of the evolution, the wave functions undergo clear separation
+in the momentum space, reflected in the dispersion of the single particle
+Hamiltonian.",1809.08491v2
+2018-10-17,Interface enhanced magnetic anisotropy in Pt/EuO films,"We report proximity effects of spin-orbit coupling in EuO$_{1-x}$ films
+capped with a Pt overlayer. Transport measurements suggest that current flows
+along a conducting channel at the interface between the Pt and EuO. The
+temperature dependence of the resistivity picks up the critical behaviors of
+EuO, i.e., the metal-to-insulator transition. We also find an unusual
+enhancement of the magnetic anisotropy in this structure from its bulk value
+which results from strong spin-orbit coupling across the Pt/EuO interface.",1810.07336v1
+2019-10-01,Collective excitations of two-dimensional Bose-Einstein Condensate in liquid phase with spin-orbit coupling,"We have studied the collective excitation of Bose-Einstein condensate of
+short range weak interacting atoms with spin-orbit coupling (SOC) in two
+dimension in liquid phase. In our study, we have included Rashba, Dresselhaus
+SOC as well as Raman SOC. The study of Bogoliubov excitation shows that in
+small interaction case only phonon modes are present and for higher
+interactions roton modes start to appear. Energy spectra contain two roton
+modes in the system relatively strong interacting atomic system.",1910.00264v2
+2019-10-21,In-plane Hall effect in two-dimensional helical electron systems,"We study Berry curvature driven and Zeeman magnetic field dependent electric
+current responses of two-dimensional electron system with spin-orbit coupling.
+New non-dissipative component of the electric current occurring in the applied
+in-plane magnetic field is described. This component is transverse to the
+electric field, odd in the magnetic field, and depends only on one particular
+direction of the magnetic field defined by the spin-orbit coupling. We show
+that the effect can be observed in a number of systems with $C_{3v}$ symmetry.",1910.09511v3
+2017-09-29,Critical temperature of pair condensation in a dilute Bose gas with spin-orbit coupling,"We study the Bardeen-Cooper-Shrieffer (BCS) pairing state of a two-component
+Bose gas with a symmetric spin-orbit coupling. In the dilute limit at low
+temperatures, this system is essentially a dilute gas of diatomic molecules. We
+compute the effective mass of the molecule and find that it is anisotropic in
+momentum space. The critical temperature of the pairing state is about eight
+times smaller than the Bose-Einstein condensation (BEC) transition temperature
+of an ideal Bose gas with the same density.",1709.10239v1
+2017-11-20,Electron paramagnetic resonance g-tensors from state interaction spin-orbit coupling density matrix renormalization group,"We present a state interaction spin-orbit coupling method to calculate
+electron paramagnetic resonance (EPR) $g$-tensors from density matrix
+renormalization group wavefunctions. We apply the technique to compute
+$g$-tensors for the \ce{TiF3} and \ce{CuCl4^2-} complexes, a [2Fe-2S] model of
+the active center of ferredoxins, and a \ce{Mn4CaO5} model of the S2 state of
+the oxygen evolving complex. These calculations raise the prospects of
+determining $g$-tensors in multireference calculations with a large number of
+open shells.",1711.07195v3
+2018-03-15,Accurate projective two-band description of topological superfluidity in spin-orbit-coupled Fermi gases,"The interplay of spin-orbit coupling and Zeeman splitting in ultracold Fermi
+gases gives rise to a topological superfluid phase in two spatial dimensions
+that can host exotic Majorana excitations. Theoretical models have so far been
+based on a four-band Bogoliubov-de Gennes formalism for the combined spin-1/2
+and particle-hole degrees of freedom. Here we present a simpler, yet accurate,
+two-band description based on a well-controlled projection technique that
+provides a new platform for exploring analogies with chiral p-wave
+superfluidity and detailed future studies of spatially non-uniform situations.",1803.05579v2
+2018-03-26,Ground-state properties of dilute Bose systems with synthetic dispersion laws,"Experimental advances in synthesizing spin-orbit couplings in cold atomic
+Bose gases promise to create single-particle dispersion laws featuring energy
+minima that are degenerate on a ring or a sphere in momentum space. We show
+that for arbitrary space dimensionality the ground-state properties of a dilute
+system of spin-orbit coupled Bose particles with such dispersion and
+short-range repulsive interactions are universal: the chemical potential
+exhibits a quadratic dependence on the particle density as found in a
+one-dimensional free Fermi gas.",1803.09732v2
+2018-12-17,Majorana zero modes in a quantum wire platform without Rashba spin-orbit coupling,"We propose a platform for engineering helical fermions in a hybridized
+double-quantum-wire setup. When our setup is proximity coupled to an $s$-wave
+superconductor it can become a class $D$ topological superconductor exhibiting
+Majorana zero modes. The goal of this proposal is to expand the group of
+available Hamiltonians to those without strong Rashba spin-orbit interactions
+which are essential to many other approaches. Furthermore, we show that there
+exist electron-electron interactions that stabilize fractional excitations
+which obey $\mathbb{Z}^{\,}_{3}$ parafermionic algebra.",1812.06633v2
+2019-12-09,Engineering Topological Nodal Line Semimetals in Rashba Spin-Orbit Coupled Atomic Chains,"We study an atomic chain in the presence of modulated charge potential and
+modulated Rashba spin-orbit coupling (RSOC) of equal period. We show that for
+commensurate periodicities $\lambda=4 n$ with integer $n$, the
+three-dimensional synthetic space obtained by sliding the two phases of the
+charge potential and RSOC features a topological nodal line semimetal protected
+by an antiunitary particle-hole symmetry. The location and shape of the nodal
+lines strongly depend on the relative amplitude between the charge potential
+and RSOC.",1912.04059v1
+2020-03-19,Two-dimensional square lattice polonium stabilized by the spin-orbit coupling,"Polonium is known as the only simple metal that has the simple cubic (SC)
+lattice in three dimension. There is a debate about whether the stabilized SC
+structure is attributed to the scalar relativistic effect or the spin-orbit
+coupling (SOC). Here, we study another phase, two-dimensional (2D) polonium
+(poloniumene), by performing density-functional theory calculations. We show
+that the 2D polonium has the square lattice structure as its ground state and
+demonstrate that the SOC (beyond the scalar relativistic approximation)
+suppresses the Peierls instability and is necessary to obtain no imaginary
+phonon frequencies over the Brillouin zone.",2003.08535v1
+2020-09-08,Topological metals and finite-momentum superconductors,"We show that Zeeman field can induce a topological transition in
+two-dimensional spin-orbit coupled metals, and concomitantly, a first-order
+phase transition in the superconducting state involving a discontinuous change
+of Cooper pair momentum. Depending on the spin-orbit coupling strength, we find
+different phase diagrams of 2D superconductors under in-plane magnetic field.",2009.03848v2
+2021-11-30,Majorana Zero Modes in Ferromagnetic Wires without Spin-Orbit Coupling,"We present a novel controllable platform for engineering Majorana zero modes.
+The platform consists of a ferromagnetic metallic wire placed among
+conventional superconductors, which are in proximity to ferromagnetic
+insulators. We demonstrate that Majorana zero modes emerge localised at the
+edges of the ferromagnetic wire, due to the interplay of the applied
+supercurrents and the induced by proximity exchange fields with conventional
+superconductivity. Our mechanism does not rely on the pairing of helical
+fermions by combining conventional superconductivity with spin-orbit coupling,
+but rather exploits the misalignment between the magnetization of the
+ferromagnetic insulators and that of the ferromagnetic wire.",2111.15260v1
+2022-02-15,Anisotropic magneto-resistance in MgO-based magnetic tunnel junctions induced by spin-orbit coupling,"We performed a first-principles study of the tunneling anisotropic
+magneto-resistance (TAMR) in Ag(Ir,Pt)$/$MgO$/$Fe junctions. Enhanced TAMR with
+ideal and skewed fourfold angular dependence is found in-plane and out-of-plane
+TAMR of the system, respectively, which shows simple barrier thickness
+dependency with number around 10\% in some junctions. The complex angular
+dependency of the interfacial resonant states due to the spin-orbit coupling
+should be responsible to the complex and enhanced TAMR found in these
+junctions.",2202.07264v1
+2022-03-11,Self-interfering dynamics in Bose-Einstein condensates with engineered dispersions,"Optical lattice and spin-orbit coupling are typical experimental approaches
+to engineer dispersion. We reveal a self-interfering dynamics in a
+noninteracting Bose-Einstein condensate with the engineered dispersion by
+optical lattice or spin-orbit coupling. The self-interference results from the
+co-occupation of positive and negative effect mass regimes in the engineered
+dispersion. The physical origination of the self-interference is explained by
+the Wigner distribution function of the self-interfering wave-packet. We
+characterize detail features of the self-interference pattern.",2203.05722v1
+2022-04-08,In situ controllable magnetic phases in doped twisted bilayer transition-metal dichalcogenides,"We study the electronic structure of hole-doped transition metal
+dichalcogenides for small twist-angels, where the onsite repulsion is extremely
+strong. Using unbiased diagrammatic Monte Carlo simulations, we find evidence
+for magnetic correlations which are driven by delocalization and can be
+controlled in situ via the dielectric environment. For weak spin-orbit
+coupling, we find that the moderately doped system becomes anti-ferromagnetic,
+whilst the regime of strong spin-orbit coupling features ferromagnetic
+correlations. We show that this behavior is accurately predicted by an
+analytical theory based on moment expansion of the Hamiltonian, and analysis of
+corresponding particle trajectories.",2204.03917v1
+2022-04-21,Detection of roton and phonon excitations in a spin-orbit coupled Bose-Einstein condensate with a moving barrier,"We propose to detect phonon and roton excitations in a two-dimensional
+Bose-Einstein condensate with Raman-induced spin-orbit coupling by perturbing
+the atomic cloud with a weak barrier. The two excitation modes can be observed
+by moving the barrier along different directions in appropriate parameter
+regimes. Phonon excitations are identified by the appearance of solitary waves,
+while roton excitations lead to distinctive spatial density modulations. We
+show that this method can also be used to determine the anisotropic critical
+velocities of superfluid.",2204.09865v2
+2022-07-22,Spin-orbit coupling induced by ascorbic acid crystals,"Some anisotropic materials form semicristalline structures, called
+spherulites, which observed in a polarisation microscope, exhibit a
+characteristic ``maltese-cross""-like pattern. While this observation has been
+hitherto considered as a tool to characterize these materials, we show that
+these patterns are associated with a strong light's spin-orbit coupling induced
+by the spherulite structures. We experimentally demonstrate these effects using
+samples of crystallized ascorbic acid and observing the creation of optical
+vortices in transmitted laser beams, as well as the formation of inhomogeneous
+polarisation patterns. Our findings suggest the use of spherulites in frequency
+ranges, e.g. in the THz domain, where polarisation and spatial shaping of
+electromagnetic radiation is still a challenging task.",2207.11340v1
+2022-07-23,"Nonreciprocal Transport in Noncoplanar Magnetic Systems without Spin-Orbit Coupling, Net Scalar Chirality, or Magnetization","We propose a new mechanism of nonlinear nonreciprocal transport in magnetic
+systems. By considering a noncoplanar magnetic ordering on a bilayer triangular
+lattice, we clarify that a local scalar chirality degree of freedom is a source
+of nonreciprocal transport, which does not require any relativistic spin-orbit
+coupling, net scalar chirality, and net magnetization. We show a close
+relationship between the asymmetric band modulation and the nonreciprocal
+transport under the noncoplanar magnetic ordering based on the model-parameter
+dependences in the real-space picture.",2207.11420v1
+2023-05-19,Josephson-type oscillations in spin-orbit coupled Bose-Einstein condensates with nonlinear optical lattices,"We consider spin-orbit coupled Bose Einstein Condensate in presence of linear
+and nonlinear optical lattices within the framework of quasi-one-dimensional
+Gross-Pitaevskii equation. The population imbalance between the states changes
+periodically with time and the oscillation amplitude depends sensitively on the
+initial phase. The optical lattice is found to change phase velocity of the
+oscillation of population imbalance. This oscillation can also be arrested
+beyond critical values of parameters. We find that the optical lattice can
+efficiently be used to control the critical point.",2305.11628v2
+2023-05-21,Electrically controllable exchange bias via interface magnetoelectric effect,"Exchange bias is a unidirectional magnetic anisotropy that often arise from
+interfacial interaction of a ferromagnetic and antiferromagnetic layers. In
+this article, we show that a metallic layer with spin-orbit coupling can
+induces an exchange bias via an interface magnetoelectric effect. In linear
+response regime, the interface magnetoelectric effect is induced by spin-orbit
+couplings that arises from the broken symmetry of the system. Furthermore, we
+demonstrate that the exchange bias can be controlled by electric field.",2305.12395v2
+2023-06-08,Magnetic anisotropy of superconducting transition in S/AF heterostructures with spin-orbit coupling,"The influence of Rashba spin-orbit coupling (SOC) on superconducting
+correlations in thin-film superconductor/antiferromagnet (S/AF) structures with
+compensated interfaces is studied. A unique effect of anisotropic enhancement
+of proximity-induced triplet correlations by the SOC is predicted. It manifests
+itself in the anisotropy of the superconducting critical temperature Tc with
+respect to orientation of the Neel vector relative to the S/AF interface, which
+is opposite to the behaviour of Tc in superconductor/ferromagnet structures. We
+show that the anisotropy is controlled by the chemical potential of the
+superconductor and, therefore, can be adjusted in (quasi)2D structures.",2306.05055v1
+2023-07-05,Lifshitz model in the presence of spin-orbit coupling,"Wave function of a localized state created by a short-range impurity in two
+dimensions falls off with distance, r, from the impurity as r^{-1/2}exp(-r/a),
+where ""a"" is the localization radius. With randomly positioned identical
+impurities with low concentration, n<<a^{-2}, the level smears into a band due
+to the overlap of the impurity wave functions. This is the essence of the
+Lifshitz model. We demonstrate that, upon incorporation of the spin-orbit
+coupling, the impurity wave functions acquire oscillating factors which,
+subsequently, modify their overlap. As a result of such modification, the
+density of states develops singularities at certain energies.",2307.01971v1
+2023-10-17,Reactive Hall and Edelstein effects in a tight-binding model with spin-orbit coupling,"The reactive Hall constant R_H, described by reactive (nondissipative)
+conductivities, is analyzed within linear response theory in the presence of
+spin-orbit interaction. Within a two dimensional tight-binding model the effect
+of van Hove singularities is studied. Along the same line a formulation of the
+Edelstein constant is proposed and studied as a function of coupling parameters
+and fermion filling.",2310.11253v2
+2023-11-23,Bulk-edge correspondence for the nonlinear eigenvalues problem of the Haldane model,"Recently, there is an interest in studying the bulk-edge correspondence for
+nonlinear eigenvalues problems in a two-dimensional topological system with
+spin-orbit coupling. By introducing auxiliary eigenvalues, the nonlinear
+bulk-edge correspondence was established. In this paper, taking the Haldane
+model as an example, we address that such a correspondence will appear in two
+dimensional topological system without spin-orbit coupling. The resulting edge
+states are characterized by the Chern number of the auxiliary energy band. A
+full phase diagram containing topological nontrivial phase, topological trivial
+phase, and metallic phase is obtained. Our work generalizes the study of the
+bulk-edge correspondence for nonlinear eigenvalue problems in two-dimensional
+system.",2311.14229v1
+2022-10-18,Coherent spin dynamics of hyperfine-coupled vanadium impurities in silicon carbide,"Progress with quantum technology has for a large part been realized with the
+nitrogen-vacancy centre in diamond. Part of its properties, however, are
+nonideal and this drives research into other spin-active crystal defects.
+Several of these come with much stronger energy scales for spin-orbit and
+hyperfine coupling, but how this affects their spin coherence is little
+explored. Vanadium in silicon carbide is such a system, with technological
+interest for its optical emission at a telecom wavelength and compatibility
+with semiconductor industry. Here we show coherent spin dynamics of an ensemble
+of vanadium defects around a clock-transition, studied while isolated from, or
+coupled to neighbouring nuclear spins. We find spin dephasing times up to 7.2
+$\mu$s, and via spin-echo studies coherence lifetimes that go well beyond tens
+of microseconds. We demonstrate operation points where strong coupling to
+neighbouring nuclear spins does not compromise the coherence of the central
+vanadium spin, which identifies how these can be applied as a coherent spin
+register. Our findings are relevant for understanding a wide class of defects
+with similar energy scales and crystal symmetries, that are currently explored
+in diamond, silicon carbide, and hexagonal boron nitride.",2210.09942v1
+2019-06-04,Hopping induced ground-state magnetism in 6H perovskite iridates,"Investigation of elementary excitations has advanced our understanding of
+many-body physics governing most physical properties of matter. Recently
+spin-orbit excitons have drawn much attention, whose condensates near phase
+transitions exhibit Higgs mode oscillations, a long-sought physical phenomenon
+[Nat. Phys. {\bf 13}, 633 (2017)]. These critical transition points resulting
+from competing spin-orbit coupling (SOC), local crystalline symmetry and
+exchange interactions, are not obvious in Iridium based materials, where SOC
+prevails in general. Here, we present results of resonant inelastic x-ray
+scattering on a spin-orbital liquid Ba$_3$ZnIr$_2$O$_9$ and three other
+6H-hexagonal perovskite iridates which show magnetism, contrary to non-magnetic
+singlet ground state expected due to strong SOC. Our results show that
+substantial hopping between closely placed Ir$^{5+}$ ions within Ir$_2$O$_9$
+dimers in these 6H-iridates, modifies spin-orbit coupled states and reduces
+spin-orbit excitation energies. Here, we are forced to use at least a two-site
+model, to match the excitation spectrum going in line with the strong
+intra-dimer hopping. Apart from SOC, low energy physics of iridates is thus
+critically dependent on hopping, and may not be ignored even for systems having
+moderate hopping, where the excitation spectra can be explained using an atomic
+model. SOC which is generally found to be 0.4-0.5~eV in iridates, is scaled in
+effect down to $\sim$0.26~eV for the 6H-systems, sustaining the hope to achieve
+quantum criticality by tuning Ir-Ir separation.",1906.01262v1
+2013-10-31,Large spin splitting in the conduction band of transition metal dichalcogenide monolayers,"We study the conduction band spin splitting that arises in transition metal
+dichalcogenide (TMD) semiconductor monolayers such as MoS$_2$, MoSe$_2$, WS$_2$
+and WSe$_2$ due to the combination of spin-orbit coupling and lack of inversion
+symmetry. Two types of calculation are done. First, density functional theory
+(DFT) calculations based on plane waves and pseudo potentials that yield large
+splittings, between 3 and 30 meV. Second, we derive a tight-binding model, that
+permits to address the atomic origin of the splitting. The basis set of the
+model is provided by the maximally localized Wannier orbitals, obtained from
+the DFT calculation, and formed by 11 atomic-like orbitals corresponding to
+5$d$ and 3$p$ orbitals of the transition metal (W,Mo) and chalcogenide (S,Se)
+atoms respectively. In the resulting Hamiltonian we can independently change
+the atomic spin-orbit coupling constant of the two atomic species at the unit
+cell, which permits to analyse their contribution to the spin splitting at the
+high symmetry points. We find that ---in contrast to the valence band--- both
+atoms give comparable contributions to the conduction band splittings. Given
+that these materials are most often $n-$doped, our findings are important for
+developments in TMD spintronics.",1311.0049v2
+2020-11-27,Shell evolution in neutron-rich nuclei: the single particle perspective,"The shell evolution has been studied extensively within the framework of
+interacting shell model, while the studies from the single particle viewpoint
+is relatively lacking or neglected. In particular, the isospin dependence of
+spin-orbit splitting has become increasingly important as $N/Z$ increases in
+neutron-rich nuclei. Following the initial independent-particle strategy
+towards explaining the occurrence of magic numbers, we have systematically
+investigated the isospin effect on the shell evolution of neutron-rich nuclei
+within the Woods-Saxon (WS) mean-field potential plus the spin-orbit term. It
+is found that new magic numbers $N = 14$ and $N =16$ may emerge in neutron-rich
+nuclei if one changes the sign of the isospin-dependent term in the spin-orbit
+coupling while the traditional magic number $N = 20$ may disappear. The magic
+number $N = 28$ is expected to be destroyed despite the sign choice of the
+isospin part in spin-orbit splitting, while $N = 50$ may disappear and $N = 82$
+persists within the single particle scheme. Besides, an appreciable amount of
+energy gap appears at $N = 32$ and 34 in neutron-rich Ca isotopes. All these
+results are more consistent with those of the interacting shell model, when the
+sign of the isospin term of the WS potential is different from that of the
+corresponding spin-orbit coupling part. The present study may provide a more
+reasonable starting point for not only the interacting shell but also other
+nuclear many-body calculations towards the neutron-dripline.",2011.13540v1
+2023-11-02,"Spin-orbit-lattice entangled state in A$_2$MgReO$_6$ (A = Ca, Sr, Ba) revealed by resonant inelastic X-ray scattering","The $5d^1$ ordered double perovskites present an exotic playground for
+studying novel multi-polar physics due to large spin-orbit coupling. We present
+Re L3 edge resonant inelastic X-ray scattering (RIXS) results that reveal the
+presence of the dynamic Jahn-Teller effect in the A$_2$MgReO$_6$ (A = Ca, Sr,
+Ba) family of $5d^1$ double perovskites. The spin-orbit excitations in these
+materials show a strongly asymmetric lineshape and exhibit substantial
+temperature dependence, indicating that they are dressed with lattice
+vibrations. Our experimental results are explained quantitatively through a
+RIXS calculation based on a spin-orbit-lattice entangled electronic ground
+state with the dynamic Jahn-Teller effect taken into consideration. We find
+that the spin-orbit-lattice entangled state is robust against magnetic and
+structural phase transitions as well as against significant static Jahn-Teller
+distortions. Our results illustrate the importance of including vibronic
+coupling for a complete description of the ground state physics of $5d^1$
+double perovskites. Usage: Secondary publications and information retrieval
+purposes.",2311.01621v1
+2006-02-10,Theory of Electric Dipole Spin Resonance in a Parabolic Quantum Well,"A theory of Electric Dipole Spin Resonance (EDSR), that is caused by various
+mechanisms of spin-orbit coupling, is developed as applied to free electrons in
+a parabolic quantum well. Choosing a parabolic shape of the well has allowed us
+to find explicit expressions for the EDSR intensity and its dependence on the
+magnetic field direction in terms of the basic parameters of the Hamiltonian.
+By using these expressions, we have investigated and compared the effect of
+specific mechanisms of spin orbit (SO) coupling and different polarizations of
+ac electric field on the intensity of EDSR. Angular dependences of the EDSR
+intensity are indicative of the relative contributions of the competing
+mechanisms of SO coupling. Our results show that electrical manipulating
+electron spins in quantum wells is generally highly efficient, especially by an
+in-plane ac electric field.",0602264v1
+2006-12-21,Zero-conductance resonances and spin-filtering effects in ring conductors subject to Rashba coupling,"We investigate the effect of Rashba spin-orbit coupling and of a tunnel
+barrier on the zero conduc- tance resonances appearing in a one-dimensional
+conducting Aharonov-Bohm (AB) ring symmet- rically coupled to two leads. The
+transmission function of the corresponding one-electron problem is derived
+within the scattering matrix approach and analyzed in the complex energy plane
+with focus on the role of the tunnel barrier strength on the zero-pole
+structure characteristic of trans- mission (anti)resonances. The lifting of the
+real conductance zeros is related to the breaking of the spin-reversal symmetry
+and time-reversal symmetry of Aharonov-Casher (AC)and AB rings, as well as to
+rotational symmetry breaking in presence of a tunnel barrier. We show that the
+polarization direction of transmitted electrons can be controlled via the
+tunnel barrier strength and discuss a novel spin-filtering design in
+one-dimensional rings with tunable spin-orbit interaction.",0612560v1
+2010-12-22,Rashba field in GaN,"We discuss problem of Rashba field in bulk GaN and in GaN/AlGaN
+two-dimensional electron gas, basing on results of X-band microwave resonance
+experiments. We point at large difference in spin-orbit coupling between bulk
+material and heterostructures. We observe coupled plasmon-cyclotron resonance
+from the two-dimensional electron gas, but no spin resonance, being consistent
+with large zero-field spin splitting due to the Rashba field reported in
+literature. In contrast, small anisotropy of g-factor of GaN effective mass
+donors indicates rather weak Rashba spin-orbit coupling in bulk material, not
+exceed 400 Gauss, alpha_BIA < 4*10^-13 eVcm. Furthermore, we observe new kind
+of electron spin resonance in GaN, which we attribute to surface electron
+accumulation layer. We conclude that the sizable Rashba field in GaN/AlGaN
+heterostructures originates from properties of the interface.",1012.4999v1
+2011-01-28,Observation of a warped helical spin-texture in Bi$_2$Se$_3$ from circular dichroism angle-resolved photoemission spectroscopy,"A differential coupling of topological surface states to left- versus
+right-circularly polarized light is the basis of many opto-spintronics
+applications of topological insulators. Here we report direct evidence of
+circular dichroism from the surface states of Bi$_2$Se$_3$ using a laser-based
+time-of-flight angle-resolved photoemission spectroscopy. By employing a novel
+sample rotational analysis, we resolve unusual modulations in the circular
+dichroism photoemission pattern as a function of both energy and momentum,
+which perfectly mimic the predicted but hitherto un-observed three-dimensional
+warped spin-texture of the surface states. By developing a microscopic theory
+of photoemission from topological surface states, we show that this correlation
+is a natural consequence of spin-orbit coupling. These results suggest that our
+technique may be a powerful probe of the spin-texture of spin-orbit coupled
+materials in general.",1101.5636v2
+2014-04-18,Oscillation of the counterpropagating spin-currents of cold atoms on a ring due to light-induced spin-orbit coupling,"The evolution of two-component cold atoms on a ring with quasispin-orbit
+(qSO) coupling and spin-flip has been studied analytically (for arbitrary
+particle number $ N $ without interaction) and numerically (for a few-body
+system with interaction). Counter-propagating and oscillating persistent
+spin-currents have been found. The regularity governing the period and
+amplitude of oscillation has been clarified. When the strengths for the qSO
+coupling and spin-flip are fixed, the frequency of oscillation can be
+effectively tuned by the Raman detuning, while the amplitude can be tuned by
+either changing the initial status and/or the Raman detuning. When the initial
+numbers of atoms of the two-components $N_{1}$ and $N_{2}$ are close to each
+other, the oscillation will be seriously suppressed. The condition for
+maximizing the amplitude of oscillation is given.",1404.4710v2
+2014-11-24,Kitaev magnetism in honeycomb RuCl3 with intermediate spin-orbit coupling,"Intensive studies of the interplay between spin-orbit coupling (SOC) and
+electronic correlations in transition metal compounds have recently been
+undertaken. In particular, $j_{\rm eff}$ = 1/2 bands on a honeycomb lattice
+provide a pathway to realize Kitaev's exactly solvable spin model. However,
+since current wisdom requires strong atomic SOC to make $j_{\rm eff}=1/2$
+bands, studies have been limited to iridium oxides. Contrary to this
+expectation, we demonstrate how Kitaev interactions arise in 4$d$-orbital
+honeycomb $\alpha$-RuCl$_3$, despite having significantly weaker SOC than the
+iridium oxides, via assistance from electron correlations. A strong coupling
+spin model for these correlation-assisted $j_{\rm eff}$ = 1/2 bands is derived,
+in which large antiferromagnetic Kitaev interactions emerge along with
+ferromagnetic Heisenberg interactions. Our analyses suggest that the ground
+state is a zigzag-ordered phase lying close to the antiferromagnetic Kitaev
+spin liquid. Experimental implications for angle resolved photoemission
+spectroscopy, neutron scattering, and optical conductivities are discussed.",1411.6623v3
+2015-04-20,Scattering Continuum and Possible Fractionalized Excitations in $α$-RuCl$_3$,"The combination of electronic correlation and spin-orbit coupling is thought
+to precipitate a variety of highly unusual electronic phases in solids,
+including topological and quantum spin liquid states. We report a Raman
+scattering study that provides evidence for unconventional excitations in
+$\alpha$-RuCl$_3$, a spin-orbit coupled Mott insulator on the honeycomb
+lattice. In particular, our measurements reveal unusual magnetic scattering,
+typified by a broad continuum. The temperature dependence of this continuum is
+evident over a large scale compared to the magnetic ordering temperature,
+suggestive of frustrated magnetic interactions. This is confirmed through an
+analysis of the phonon linewidths, which show a related anomaly due to
+spin-phonon coupling. These observations are in line with theoretical
+expectations for the Heisenberg-Kitaev model and suggest that $\alpha$-RuCl$_3$
+may be close to a quantum spin liquid ground state.",1504.05202v1
+2016-09-24,"Spin-orbit coupling and magnetic interactions in Si(111):{C,Si,Sn,Pb}","We study the magnetic properties of the adatom systems on a semiconductor
+surface Si(111):\{C,Si,Sn,Pb\} - ($\sqrt{3} \times \sqrt{3}$). On the basis of
+all-electron density functional theory calculations we construct effective
+low-energy models taking into account spin-orbit coupling and electronic
+correlations. In the ground state the surface nanostructures are found to be
+insulators with the non-collinear 120$^{\circ}$ N\'eel (for C, Si, Sn monolayer
+coverages) and 120$^{\circ}$ row-wise (for Pb adatom) antiferromagnetic
+orderings. The corresponding spin Hamiltonians with anisotropic exchange
+interactions are derived by means of the superexchange theory and the
+calculated Dzyaloshinskii-Moriya interactions are revealed to be very strong
+and compatible with the isotropic exchange couplings in the systems with Sn and
+Pb adatoms. To simulate the excited magnetic states we solve the constructed
+spin models by means of the Monte Carlo method. At low temperatures and zero
+magnetic field we observe complex spin spiral patterns in Sn/Si(111) and
+Pb/Si(111). On this basis the formation of antiferromagnetic skyrmion lattice
+states in adatom $sp$ electron systems in strong magnetic fields is discussed.",1609.07648v1
+2017-04-17,A novel design to realize deterministic switching of perpendicularly magnetic layers by spin orbital torque through antiferromagnetic coupling,"We proposed a novel and simple multilayer structure to realize the
+deterministic switching of perpendicularly magnetized layers (Co in our work)
+by spin orbital torque from the spin Hall Effect in this paper. A pinned layer
+is introduced, antiferromagnetically coupled to the magnetic Co layer. We have
+confirmed the deterministic switching of perpendicularly magnetized layers from
+perspectives of switching loops, trajectories and switching properties under
+periodic spin currents through micromagnetic simulation. The antiferromagnetic
+interaction accounts for the deterministic switching exhibited in the structure
+and the reversal ultimate state of the magnetic layer is predictable when the
+applied spin current density is above 60MA/cm2. In our design, the
+antiferromagnetic coupling is easily tunable and no external magnetic field is
+needed.",1704.04835v2
+2017-07-13,Andreev spin qubits in multichannel Rashba nanowires,"We theoretically analyze the Andreev bound states and their coupling to
+external radiation in superconductor-nanowire-superconductor Josephson
+junctions. We provide an effective Hamiltonian for the junction projected onto
+the Andreev level subspace and incorporating the effects of nanowire
+multichannel structure, Rashba spin-orbit coupling, and Zeeman field. Based on
+this effective model, we investigate the dependence of the Andreev levels and
+the matrix elements of the current operator on system parameters such as
+chemical potential, nanowire dimensions, and normal transmission. We show that
+the combined effect of the multichannel structure and the spin-orbit coupling
+gives rise to finite current matrix elements between odd states having
+different spin polarizations. Moreover, our analytical results allow to
+determine the appropriate parameters range for the detection of transitions
+between even as well as odd states in circuit QED like experiments, which may
+provide a way for the Andreev spin qubit manipulation.",1707.04273v1
+2020-02-13,Geometric spin-orbit coupling and chirality-induced spin selectivity,"We report a new type of spin-orbit coupling (SOC) called geometric SOC.
+Starting from the relativistic theory in curved space, we derive an effective
+nonrelativistic Hamiltonian in a generic curve embedded into flat three
+dimensions. The geometric SOC is $O(m^{-1})$, in which $m$ is the electron
+mass, and hence much larger than the conventional SOC of $O(m^{-2})$. The
+energy scale is estimated to be a hundred meV for a nanoscale helix. We
+calculate the current-induced spin polarization in a coupled-helix model as a
+representative of the chirality-induced spin selectivity. We find that it
+depends on the chirality of the helix and is of the order of $0.01 \hbar$ per
+${\rm nm}$ when a charge current of $1~{\rm \mu A}$ is applied.",2002.05371v2
+2017-05-04,Mechanism for unconventional superconductivity in the hole-doped Rashba-Hubbard model,"Motivated by the recent resurgence of interest in topological
+superconductivity, we study in this paper superconducting pairing instabilities
+of the hole-doped Rashba-Hubbard model on the square lattice with first- and
+second-neighbor hopping. Within a weak-coupling approach based on the random
+phase approximation, we compute the spin-fluctuation mediated paring
+interactions as a function of spin-orbit coupling and hole doping. Rashba
+spin-orbit coupling splits the spin degeneracies of the bands, which leads to
+two van Hove singularities at two different fillings. We find that for a broad
+doping region in between these two van Hove fillings the spin fluctuations
+exhibit a strong ferromagnetic contribution. Because of these ferromagnetic
+fluctuations, the triplet $f$-wave pairing channel is dominant within this
+filling region, resulting in a topologically nontrival phase. We discuss
+possible experimental realizations of this phase in heavy-fermion hybrid
+structures.",1705.01904v2
+2017-05-10,Spin-tensor--momentum-coupled Bose-Einstein condensates,"The recent experimental realization of spin-orbit coupling for ultracold
+atomic gases provides a powerful platform for exploring many interesting
+quantum phenomena. In these studies, spin represents spin vector (spin-1/2 or
+spin-1) and orbit represents linear momentum. Here we propose a scheme to
+realize a new type of spin-tensor--momentum coupling (STMC) in spin-1 ultracold
+atomic gases. We study the ground state properties of interacting Bose-Einstein
+condensates (BECs) with STMC and find interesting new types of stripe
+superfluid phases and multicritical points for phase transitions. Furthermore,
+STMC makes it possible to study quantum states with dynamical stripe orders
+that display density modulation with a long tunable period and high visibility,
+paving the way for direct experimental observation of a new dynamical
+supersolid-like state.. Our scheme for generating STMC can be generalized to
+other systems and may open the door for exploring novel quantum physics and
+device applications.",1705.03920v3
+2019-01-28,Simple model for electrical hole spin manipulation in semiconductor quantum dots: Impact of dot material and orientation,"We analyze a prototypical particle-in-a-box model for a hole spin qubit. This
+quantum dot is subjected to static magnetic and electric fields, and to a
+radio-frequency electric field that drives Rabi oscillations owing to
+spin-orbit coupling. We derive the equations for the Rabi frequency in a regime
+where the Rabi oscillations mostly result from the coupling between the qubit
+states and a single nearby excited state. This regime has been shown to prevail
+in, e.g., hole spin qubits in thin silicon-on-insulator nanowires. The
+equations for the Rabi frequency highlight the parameters that control the Rabi
+oscillations. We show, in particular, that [110]-oriented dots on (001)
+substrates perform much better than [001]-oriented dots because they take best
+advantage of the anisotropy of the valence band of the host material. We also
+conclude that silicon provides the best opportunities for fast Rabi
+oscillations in this regime despite small spin-orbit coupling.",1901.09563v2
+2019-04-02,Deriving models for the Kitaev spin-liquid candidate material $α$-RuCl$_3$ from first principles,"We use the constrained random phase approximation (cRPA) to derive from first
+principles the Ru-$t_{2g}$ Wannier function based model for the Kitaev
+spin-liquid candidate material $\alpha$-RuCl$_3$. We find the non-local Coulomb
+repulsion to be sizable compared to the local one. In addition we obtain the
+contribution to the Hamiltonian from the spin-orbit coupling and find it to
+also contain non-negligible non-local terms. We invoke strong coupling
+perturbation theory to investigate the influence of these non-local elements of
+the Coulomb repulsion and the spin-orbit coupling on the magnetic interactions.
+We find that the non-local Coulomb repulsions cause a strong enhancement of the
+magnetic interactions, which deviate from experimental fits reported in the
+literature. Our results contribute to the understanding and design of quantum
+spin liquid materials via first principles calculations.",1904.01523v2
+2019-11-04,Spin-orbit coupling and spin-triplet pairing symmetry in $\mathrm{Sr_2 Ru O_4}$,"Spin-orbit coupling (SOC) plays a crucial role in determining the spin
+structure of an odd parity psedospin-triplet Cooper pairing state. Here, we
+present a thorough study of how SOC lifts the degeneracy among different p-wave
+pseudospin-triplet pairing states in a widely used microscopic model for
+$\mathrm{Sr_2 Ru O_4}$, combining a Ginzburg-Landau (GL) free energy expansion,
+a symmetry analysis of the model, and numerical weak-coupling renormalization
+group (RG) and random phase approximation (RPA) calculations. These analyses
+are then used to critically re-examine previous numerical results on the
+stability of chiral p-wave pairing. The symmetry analysis can serve as a guide
+for future studies, especially numerical calculations, on the pairing
+instability in $\mathrm{Sr_2 Ru O_4}$ and can be useful for studying other
+multi-band spin-triplet superconductors where SOC plays an important role.",1911.01446v2
+2019-12-05,Enhanced spin-orbit coupling in a heavy metal via molecular coupling,"Heavy metals are key to spintronics because of their high spin-orbit coupling
+(SOC) leading to efficient spin conversion and strong magnetic interactions.
+When C60 is deposited on Pt, the molecular interface is metallised and the spin
+Hall angle in YIG/Pt increased, leading to an enhancement of up to 600% in the
+spin Hall magnetoresistance and 700% for the anisotropic magnetoresistance.
+This correlates with Density Functional Theory simulations showing changes of
+0.46 eV/C60 in the SOC of Pt. This effect opens the possibility of gating the
+molecular hybridisation and SOC of metals.",1912.02712v2
+2021-02-15,Antiferromagnetic Skyrmion Crystals in the Rashba Hund's Model on Triangular Lattice,"Motivated by the importance of antiferromagnetic skyrmions as building blocks
+of next-generation data storage and processing devices, we report theoretical
+and computational analysis of a model for a spin-orbit coupled correlated
+magnet on a triangular lattice. We find that two distinct antiferromagnetic
+skyrmion crystal (AF-SkX) states can be stabilized at low temperatures in the
+presence of external magnetic field. The results are obtained via Monte Carlo
+simulations on an effective magnetic model derived from the microscopic
+electronic Hamiltonian consisting of Rashba spin-orbit coupling, as well as the
+Hund's rule coupling of electrons to large classical spins. The two AF-SkX
+phases are understood to originate from a classical spin liquid state that
+exists at low but finite temperatures. These AF-SkX states can be easily
+distinguished from each other in experiments as they are characterized by peaks
+at distinct momenta in the spin structure factor which is directly measured in
+neutron scattering experiments. We also discuss examples of materials where the
+model as well as the two AF-SkX states can be realized.",2102.07563v1
+2021-09-04,Inverse Faraday effect in Mott insulators,"The inverse Faraday effect (IFE), where a static magnetization is induced by
+circularly polarized light, offers a promising route to ultrafast control of
+spin states. Here we study the IFE in Mott insulators using the Floquet theory.
+We find two distinct IFE behavior governed by the inversion symmetry. In the
+Mott insulators with inversion symmetry, we find that the effective magnetic
+field induced by the IFE couples ferromagnetically to the neighboring spins.
+While for the Mott insulators without inversion symmetry, the effective
+magnetic field due to IFE couples antiferromagnetically to the neighboring
+spins. We apply the theory to the spin-orbit coupled single- and multi-orbital
+Hubbard model that is relevant for the Kitaev quantum spin liquid material and
+demonstrate that the magnetic interactions can be tuned by light.",2109.01940v4
+2022-05-27,Nonlinear $σ$-model for disordered systems with intrinsic spin-orbit coupling,"We derive the nonlinear $\sigma$-model to describe diffusive transport in
+normal metals and superconductors with intrinsic spin-orbit coupling (SOC). The
+SOC is described via an SU(2) gauge field, and we expand the model to the
+fourth order in gradients to find the leading non-Abelian field-strength
+contribution. This contribution generates the spin-charge coupling that is
+responsible for the spin-Hall effect. We discuss how its symmetry differs from
+the leading quasiclassical higher-order gradient terms. We also derive the
+corresponding Usadel equation describing the diffusive spin-charge dynamics in
+superconducting systems. As an example, we apply the obtained equations to
+describe the anomalous supercurrent in dirty Rashba superconductors at
+arbitrary temperatures.",2205.14075v1
+2023-05-17,Quantum disordered ground state in the spin-orbit coupled Jeff = 1/2 distorted honeycomb magnet BiYbGeO5,"We delineate quantum magnetism in the strongly spin-orbit coupled, distorted
+honeycomb-lattice antiferromagnet BiYbGeO$_{5}$. Our magnetization and heat
+capacity measurements reveal that its low-temperature behavior is well
+described by an effective $J_{\rm eff}=1/2$ Kramers doublet of Yb$^{3+}$. The
+ground state is nonmagnetic with a tiny spin gap. Temperature-dependent
+magnetic susceptibility, magnetization isotherm, and heat capacity could be
+modeled well assuming isolated spin dimers with anisotropic exchange
+interactions $J_{\rm Z} \simeq 2.6$~K and $J_{\rm XY} \simeq 1.3$~K. Heat
+capacity measurements backed by muon spin relaxation suggest the absence of
+magnetic long-range order down to at least 80\,mK both in zero field and in
+applied fields. This sets BiYbGeO$_5$ apart from Yb$_2$Si$_2$O$_7$ with its
+unusual regime of magnon Bose-Einstein condensation and suggests negligible
+interdimer couplings, despite only a weak structural deformation of the
+honeycomb lattice.",2305.10221v1
+2023-07-07,Spectral properties of a mixed singlet-triplet Ising superconductor,"Conventional two-dimensional superconductivity is destroyed when the critical
+in-plane magnetic field exceeds the so-called Pauli limit. Some monolayer
+transition-metal dichalcogenides lack inversion symmetry and the strong
+spin-orbit coupling leads to a valley-dependent Zeeman-like spin splitting. The
+resulting spin-valley locking lifts the valley degeneracy and results in a
+strong enhancement of the in-plane critical magnetic field. In these systems,
+it was predicted that the density of states in an in-plane field exhibits
+distinct mirage gaps at finite energies of about the spin-orbit coupling
+strength, which arise from a coupling of the electron and hole bands at energy
+larger than the superconducting gap. In this study, we investigate the impact
+of a triplet pairing channel on the spectral properties, primarily the mirage
+gap and the superconducting gap, in the clean limit. Notably, in the presence
+of the triplet pairing channel, the mirage-gap width is reduced for the low
+magnetic fields. Furthermore, when the temperature is lower than the triplet
+critical temperature, the mirage gaps survive even in the strong-field limit
+due to the finite singlet and triplet order parameters. Our work provides
+insights into controlling and understanding the properties of spin-triplet
+Cooper pairs.",2307.03456v1
+2024-01-28,Magnetic interactions and excitations in SrMnSb$_2$,"The magnetic interactions in the antiferromagnetic (AFM) Dirac semimetal
+candidate SrMnSb$_2$ are investigated using \textit{ab initio} linear response
+theory and inelastic neutron scattering (INS). Our calculations reveal that the
+first two nearest in-plane couplings ($J_1$ and $J_2$) are both AFM in nature,
+indicating a significant degree of spin frustration, which aligns with
+experimental observations. The orbital resolution of exchange interactions
+shows that $J_1$ and $J_2$ are dominated by direct and superexchange,
+respectively. In a broader context, a rigid-band model suggests that electron
+doping fills the minority spin channel and results in a decrease in the AFM
+coupling strength for both $J_1$ and $J_2$. To better compare with INS
+experiments, we calculate the spin wave spectra within a linear spin wave
+theory framework, utilizing the computed exchange parameters. The calculated
+spin wave spectra exhibit overall good agreement with measurements from INS
+experiments, although with a larger magnon bandwidth. Introducing additional
+electron correlation within the Mn-$3d$ orbitals can promote electron
+localization and reduce the magnetic coupling, further improving the agreement
+with experiments.",2401.15572v1
+2022-10-31,How Spin Relaxes and Dephases in Bulk Halide Perovskites,"Spintronics in halide perovskites has drawn significant attention in recent
+years, due to highly tunable spin-orbit fields and intriguing interplay with
+lattice symmetry. Spin lifetime -- a key parameter that determines the
+applicability of materials for spintronics and spin-based quantum information
+applications -- has been extensively measured in halide perovskites, but not
+yet assessed from first-principles calculations. Here, we leverage our
+recently-developed \emph{ab initio} density-matrix dynamics framework to
+compute the spin relaxation time ($T_{1}$) and ensemble spin dephasing time
+($T_{2}^{*}$) in a prototype halide perovskite, namely CsPbBr$_{3}$ with
+self-consistent spin-orbit coupling (SOC) and quantum descriptions of the
+electron scattering processes. We also implement the Land\'e $g$-factor for
+solids from first principles and take it into account in our dynamics, which is
+required to accurately capture spin dephasing at external magnetic fields. We
+thereby predict intrinsic spin lifetimes as an upper bound for experiments,
+identify the dominant spin relaxation pathways, and evaluate the dependence on
+temperature, external fields, carrier density,and impurities. Importantly, we
+find that the Fr{\""o}hlich interaction that dominates carrier relaxation
+contributes negligibly to spin relaxation, consistent with the spin-conserving
+nature of this interaction. We investigated the effect of spin-orbit field with
+inversion asymmetry on spin lifetime, and we demonstrated from our calculation,
+persistent spin helix can enhance spin lifetime when the spin-split is large,
+but it can not be realized by Rashba SOC. Our theoretical approach may lead to
+new strategies to optimize spin and carrier transport properties in spintronics
+and quantum information applications.",2210.17074v3
+2016-05-30,A two-dimensional spin field-effect transistor,"The integration of the spin degree of freedom in charge-based electronic
+devices has revolutionised both sensing and memory capability in
+microelectronics. Further development in spintronic devices requires electrical
+manipulation of spin current for logic operations. The approach followed so
+far, inspired by the seminal proposal of the Datta and Das spin modulator, has
+relied on the spin-orbit field as a medium for electrical control of the spin
+state. However, the still standing challenge is to find a material whose
+spin-orbit-coupling (SOC) is weak enough to transport spins over long
+distances, while also being strong enough to allow their electrical
+manipulation. Here we demonstrate a radically different approach by engineering
+a heterostructure from atomically thin crystals, which are ""glued"" by weak van
+der Waals (vdW) forces and which combine the superior spin transport properties
+of graphene with the strong SOC of the semiconducting MoS$_{2}$. The spin
+transport in the graphene channel is modulated between ON and OFF states by
+tuning the spin absorption into the MoS$_{2}$ layer with a gate electrode. Our
+demonstration of a spin field-effect transistor using two-dimensional (2D)
+materials identifies a new route towards spin logic operations for beyond CMOS
+technology.",1605.09159v1
+2018-12-05,Observation of Spin Hall Effect in Weyl Semimetal WTe2 at Room Temperature,"Discovery of topological Weyl semimetals has revealed the opportunities to
+realize several extraordinary physical phenomena in condensed matter physics.
+Specifically, these semimetals with strong spin-orbit coupling, broken
+inversion symmetry and novel spin texture are predicted to exhibit a large spin
+Hall effect that can efficiently convert the charge current to a spin current.
+Here we report the direct experimental observation of a large spin Hall and
+inverse spin Hall effects in Weyl semimetal WTe2 at room temperature obeying
+Onsager reciprocity relation. We demonstrate the detection of the pure spin
+current generated by spin Hall phenomenon in WTe2 by making van der Waals
+heterostructures with graphene, taking advantage of its long spin coherence
+length and spin transmission at the heterostructure interface. These
+experimental findings well supported by ab initio calculations show a large
+charge-spin conversion efficiency in WTe2; which can pave the way for
+utilization of spin-orbit induced phenomena in spintronic memory and logic
+circuit architectures.",1812.02113v2
+2001-12-21,Theory of single spin detection with STM,"We propose a mechanism for detection of a single spin center on a
+non-magnetic substrate. In the detection scheme, the STM tunnel current is
+correlated with the spin orientation. In the presence of magnetic field, the
+spin precesses and the tunnel current is modulated at the Larmor frequency. The
+mechanism relies on the effective spin-orbit interaction between the injected
+unpolarized STM current and the local spin center, which leads to the nodal
+structure of the spatial signal profile. Based on the proposed mechanism, the
+strongest spin-related signal can be expected for the systems with large
+spin-orbit coupling and low carrier concentration.",0112407v2
+2007-09-05,Topological spin-Hall current in waveguided zinc-blende semiconductors with Dresselhaus spin-orbit coupling,"We describe an intrinsic spin-Hall effect in $n$-type bulk zinc-blende
+semiconductors with topological origin. When electron transport is confined to
+a waveguide structure, and the applied electric field is such that the spins of
+electrons remain as eigenstates of the Dresselhaus spin-orbit field with
+negligible subband mixing, a gauge structure appears in the momentum space of
+the system. In particular, the momentum space exhibits a non-trivial Berry
+curvature which affects the transverse motion of electrons anisotropically in
+spin, thereby producing a finite spin-Hall effect. The effect should be
+detectable using standard techniques in the literature such as Kerr rotation,
+and be readily distinguishable from other mechanisms of the spin-Hall effect.",0709.0609v2
+2010-07-31,Random walk approach to spin dynamics in a two-dimensional electron gas with spin-orbit coupling,"We introduce and solve a semi-classical random walk (RW) model that describes
+the dynamics of spin polarization waves in zinc-blende semiconductor quantum
+wells. We derive the dispersion relations for these waves, including the
+Rashba, linear and cubic Dresselhaus spin-orbit interactions, as well as the
+effects of an electric field applied parallel to the spin polarization
+wavevector. In agreement with fully quantum mechanical calculations [Kleinert
+and Bryksin, Phys. Rev. B \textbf{76}, 205326 (2007)], the RW approach predicts
+that spin waves acquire a phase velocity in the presence of the field that
+crosses zero at a nonzero wavevector, $q_0$. In addition, we show that the
+spin-wave decay rate is independent of field at $q_0$ but increases as
+$(q-q_0)^2$ for $q\neq q_0$. These predictions can be tested experimentally by
+suitable transient spin grating experiments.",1008.0132v2
+2011-10-18,Two-orbital Schwinger Boson Representation of Spin-One: Application to a Non-abelian Spin Liquid with Quaternion Gauge Field,"A non-abelian spin liquid in triangular lattice spin-1 systems was recently
+formulated in the form of continuum field theory [T. Grover, and T. Senthil,
+Phys. Rev. Lett. 107, 077203 (2011); Cenke Xu, A.W.W. Ludwig, arXiv:1012.5671].
+It has spin-1/2 bosonic spinons coupled to emergent quaternion gauge fields,
+and can be obtained by quantum disordering a non-collinear spin nematic order
+hypothesized to describe NiGa_2S_4 [H. Tsunetsugu, and M. Arikawa, J. Phys.
+Soc. Jpn. 75, 083701 (2006)], However a microscopic lattice description, e.g.
+the lattice spinon (mean-field) Hamiltonian and the spin wavefunction, has been
+missing, and it has been noted that the standard Schwinger boson or bosonic
+triplon representations of spin-1 cannot describe this spin liquid. In this
+paper a two-orbital Schwinger boson representation for spin-1 systems is
+developed and used to construct a mean-field description of this quaternion
+spin liquid. Projecting the mean-field state produces a prototype wavefunction,
+which is a superposition of close-packed AKLT loop configurations with
+nontrivial amplitudes. This new formalism and related wavefunctions may be
+generalized to higher spin systems and can possibly produce spin liquid states
+with even richer emergent gauge structures.",1110.4091v1
+2012-08-20,Reversal and Termination of Current-Induced Domain Wall Motion via Magnonic Spin-Transfer Torque,"We investigate the domain wall dynamics of a ferromagnetic wire under the
+combined influence of a spin-polarized current and magnonic spin-transfer
+torque generated by an external field, taking also into account Rashba
+spin-orbit coupling interactions. It is demonstrated that current-induced
+motion of the domain wall may be completely reversed in an oscillatory fashion
+by applying a magnonic spin-transfer torque as long as the spin-wave velocity
+is sufficiently high. Moreover, we show that the motion of the domain wall may
+be fully terminated by means of the generation of spin-waves, suggesting the
+possibility to pin the domain-walls to predetermined locations. We also discuss
+how strong spin-orbit interactions modify these results.",1208.4108v1
+2013-11-12,Leggett's Modes in Magnetic Systems with Jahn-Teller distortion,"Leggett's mode is a collective excitation corresponding to the oscillation of
+the relative phase of the order parameters in a two band superconductor, with
+frequency proportional to interband coupling. We report on the existence of
+modes, similar to Leggett's mode, in magnetic systems with Jahn-Teller
+distortion. The minimal Kugel-Khomskii model, which describes simultaneously
+both the spin and the orbital order, is studied. The dynamical degrees of
+freedom are spin-$s$ operators of localized spins and pseudospin-$\tau$
+operators, which respond to the orbital degeneracy and satisfy the similar
+commutation relation with those of the spin operators. In the case of
+""antiferro"" spin and pseudospin order the system possesses two
+antiferromagnetic magnons with equal spin-wave velocities and two Leggett's
+modes with equal gaps proportional to the square root of the spin-pseudospin
+interaction constant. In the case of ""ferro"" spin and pseudospin order the
+system possesses one ferromagnetic magnon and one Leggett's mode with gap
+proportional to the spin-pseudospin interaction constant.",1311.2733v3
+2014-01-02,Topological Spin Texture in a Quantum Anomalous Hall Insulator,"The quantum anomalous Hall (QAH) effect has been recently discovered in
+experiment using thin-film topological insulator with ferromagnetic ordering
+and strong spin-orbit coupling. Here we investigate the spin degree of freedom
+of a QAH insulator and uncover a fundamental phenomenon that the edge states
+exhibit topologically stable spin texture in the boundary when a chiral-like
+symmetry is present. This result shows that edge states are chiral in both the
+orbital and spin degrees of freedom, and the chiral edge spin texture
+corresponds to the bulk topological states of the QAH insulator. We also study
+the potential applications of the edge spin texture in designing
+topological-state-based spin devices which might be applicable to future
+spintronic technologies.",1401.0415v3
+2015-02-02,Theory of spin polarization in mesoscopic spin-orbit coupling systems,"We establish a general formalism of the bulk spin polarization (BSP) and the
+current-based spin polarization (CSP) for mesoscopic ferromagnetic and
+spin-orbit interaction (SOI) semiconducting systems. Based on this formalism,
+we reveal the basic properties of BSP and CSP and their relationships. The BSP
+describes the intrinsic spin polarized properties of devices. The CSP depends
+on both intrinsic parameters of device and the incident current. For the
+non-spin-polarized incident current with the inphase spin-phase coherence, CSP
+equals to BSP. We give analytically the BSP and CSP of several typical
+nanodevice models, ferromagnetic nanowire, Rashba nanowire and rings. These
+results provide basic physical behaviors of BSP and CSP and their
+relationships.",1502.00476v1
+2016-04-07,Persistent Spin Textures in Semiconductor Nanostructures,"Device concepts in semiconductor spintronics make long spin lifetimes
+desirable, and the requirements put on spin control by schemes of quantum
+information processing are even more demanding. Unfortunately, due to
+spin-orbit coupling electron spins in semiconductors are generically subject to
+rather fast decoherence. In two-dimensional quantum wells made of zinc-blende
+semiconductors, however, the spin-orbit interaction can be engineered in such a
+way that persistent spin structures with extraordinarily long spin lifetimes
+arise even in the presence of disorder and imperfections. We review
+experimental and theoretical developments on this subject both for $n$-doped
+and $p$-doped structures, and we discuss possible device applications.",1604.02026v2
+2016-06-28,Spin-multipole effects in binary black holes and the test-body limit,"We discuss the effects of the black holes' spin-multipole structure in the
+orbital dynamics of binary black holes according to general relativity,
+focusing on the leading-post-Newtonian-order couplings at each order in an
+expansion in the black holes' spins. We first review previous widely confirmed
+results up through fourth order in spin, observe suggestive patterns therein,
+and discuss how the results can be extrapolated to all orders in spin with
+minimal information from the test-body limit. We then justify this
+extrapolation by providing a complete derivation within the post-Newtonian
+framework of a canonical Hamiltonian for a binary black hole, for generic
+orbits and spin orientations, which encompasses the leading post-Newtonian
+orders at all orders in spin. At the considered orders, the results reveal a
+precise equivalence between arbitrary-mass-ratio two-spinning-black-hole
+dynamics and the motion of a test black hole in a Kerr spacetime, as well as an
+intriguing relationship to geodesic motion in a Kerr spacetime.",1606.08832v3
+2011-11-22,Nonuniversality of the intrinsic inverse spin-Hall effect in diffusive systems,"We studied the electric current induced in a two-dimensional electron gas by
+the spin current, in the presence of Rashba and cubic Dresselhaus spin-orbit
+interactions. We found out that the factor relating these currents is not
+universal, but rather depends on the origin of the spin current. Drastic
+distinction has been found between two cases: the spin current created by
+diffusion of an inhomogeneous spin density, and the pure homogeneous spin
+current. We found out that in the former case the ISHE electric current is
+finite, while it turns to zero in the latter case, if the spin-orbit coupling
+is represented by Rashba interaction.",1111.5082v2
+2019-07-18,Tunning Spin Hall conductivities in GeTe by Ferroelectric Polarization,"Controlling charge-spin current conversion by electric fields is crucial in
+spintronic devices, which can be realized in diatom ferroelectric semiconductor
+GeTe where it is established that ferroelectricity can change the spin texture.
+We demonstrated that the spin Hall conductivity (SHC) can be further tuned by
+ferroelectricity based on the density functional theory calculations. The spin
+texture variation driven by the electric fields was elucidated from the
+symmetry point of view, highlighting the interlocked spin and orbital degrees
+of freedom. We observed that the origin of SHC can be attributed to the Rashba
+effect and the intrinsic spin-orbit coupling. The magnitude of one component of
+SHC {\sigma}_xy^z can reach as large as 100 {\hbar}/e/({\Omega}cm) in the
+vicinity of the band edge, which is promising for engineering spintronic
+devices. Our work on tunable spin transport properties via the ferroelectric
+polarization brings novel assets into the field of spintronics.",1907.07919v2
+2017-11-09,Room Temperature Giant Charge-to-Spin Conversion at SrTiO3/LaAlO3 Oxide Interface,"Two-dimensional electron gas (2DEG) formed at the interface between SrTiO3
+(STO) and LaAlO3 (LAO) insulating layer is supposed to possess strong Rashba
+spin-orbit coupling. To date, the inverse Edelstein effect (i.e. spin-to-charge
+conversion) in the 2DEG layer is reported. However, the direct effect of
+charge-to-spin conversion, an essential ingredient for spintronic devices in a
+current induced spin-orbit torque scheme, has not been demonstrated yet. Here
+we show, for the first time, a highly efficient spin generation with the
+efficiency of ~6.3 in the STO/LAO/CoFeB structure at room temperature by using
+spin torque ferromagnetic resonance. In addition, we suggest that the spin
+transmission through the LAO layer at high temperature range is attributed to
+the inelastic tunneling via localized states in the LAO band gap. Our findings
+may lead to potential applications in the oxide insulator based spintronic
+devices.",1711.03268v1
+2020-08-24,Enhancement of Spin-charge Conversion in Dilute Magnetic Alloys by Kondo Screening,"We derive a kinetic theory capable of dealing both with large spin-orbit
+coupling and Kondo screening in dilute magnetic alloys. We obtain the collision
+integral non-perturbatively and uncover a contribution proportional to the
+momentum derivative of the impurity scattering S-matrix. The latter yields an
+important correction to the spin diffusion and spin-charge conversion
+coefficients, and fully captures the so-called side-jump process without
+resorting to the Born approximation (which fails for resonant scattering), or
+to otherwise heuristic derivations. We apply our kinetic theory to a quantum
+impurity model with strong spin-orbit, which captures the most important
+features of Kondo-screened Cerium impurities in alloys such as
+La$_{1-x}$Cu$_6$. We find 1) a large zero-temperature spin Hall conductivity
+that depends solely on the Fermi wave number and 2) a transverse spin diffusion
+mechanism that modifies the standard Fick's diffusion law. Our predictions can
+be readily verified by standard spin-transport measurements in metal alloys
+with Kondo impurities.",2008.10185v2
+2020-11-29,Spin Seebeck Effect in Nonmagnetic Excitonic Insulators,"We propose a mechanism of the spin Seebeck effect attributed to excitonic
+condensation in a nonmagnetic insulator. We analyze a half-filled two-orbital
+Hubbard model with a crystalline field splitting in the strong coupling limit.
+In this model, the competition between the crystalline field and electron
+correlations brings about an excitonic insulating state, where the two orbitals
+are spontaneously hybridized. Using the generalized spin-wave theory and
+Boltzmann transport equation, we find that a spin current generated by a
+thermal gradient is observed in the excitonic insulating state without magnetic
+fields. The spin Seebeck effect originates from spin-split collective
+excitation modes although the ground state does not exhibit any magnetic
+orderings. This peculiar phenomenon is inherent in the excitonic insulating
+state, whose order parameter is time-reversal odd and yields a spin splitting
+for the collective excitation modes. We also find that the spin current is
+strongly enhanced and its direction is inverted in the vicinity of the phase
+transition to another magnetically ordered phase. We suggest that the present
+phenomenon is possibly observed in perovskite cobaltites with the
+GdFeO$_3$-type lattice distortion.",2011.14337v1
+2005-10-25,Non-equilibrium spin polarization effects in spin-orbit coupling system and contacting metallic leads,"We study theoretically the current-induced spin polarization effect in a
+two-terminal mesoscopic structure which is composed of a semiconductor
+two-dimensional electron gas (2DEG) bar with Rashba spin-orbit (SO) interaction
+and two attached ideal leads. The nonequilibrium spin density is calculated by
+solving the scattering wave functions explicitly within the ballistic transport
+regime. We found that for a Rashba SO system the electrical current can induce
+spin polarization in the SO system as well as in the ideal leads. The induced
+polarization in the 2DEG shows some qualitative features of the intrinsic spin
+Hall effect. On the other hand, the nonequilibrium spin density in the ideal
+leads, after being averaged in the transversal direction, is independent of the
+distance measured from the lead/SO system interface, except in the vicinity of
+the interface. Such a lead polarization effect can even be enhanced by the
+presence of weak impurity scattering in the SO system and may be detectable in
+real experiments.",0510664v2
+2014-12-09,Spin excitations in the nematic phase and the metallic stripe spin-density wave phase of iron pnictides,"We present a general study of the magnetic excitations within a weak-coupling
+five-orbital model relevant to itinerant iron pnictides. As a function of
+enhanced electronic correlations, the spin excitations in the symmetry broken
+spin-density wave phase evolve from broad low-energy modes in the limit of weak
+interactions to sharply dispersing spin wave prevailing to higher energies at
+larger interaction strengths. We show how the resulting spin response at high
+energies depends qualitatively on the magnitude of the interactions. We also
+calculate the magnetic excitations in the nematic phase by including an orbital
+splitting, and find a pronounced C_2 symmetric excitation spectrum right above
+the transition to long-range magnetic order. Finally, we discuss the C_2 versus
+C_4 symmetry of the spin excitations as a function of energy for both the
+nematic and the spin-density wave phase.",1412.2912v1
+2015-05-12,Spin-Orbit Coupling Fluctuations as a Mechanism of Spin Decoherence,"We discuss a general framework to address spin decoherence resulting from
+fluctuations in a spin Hamiltonian. We performed a systematic study on spin
+decoherence in the compound K$_6$[V$_{15}$As$_6$O$_{42}$(D$_2$O)] $\cdot$
+8D$_2$O, using high-field Electron Spin Resonance (ESR). By analyzing the
+anisotropy of resonance linewidths as a function of orientation, temperature
+and field, we find that the spin-orbit term is a major decoherence source. The
+demonstrated mechanism can alter the lifetime of any spin qubit and we discuss
+how to mitigate it by sample design and field orientation.",1505.03177v2
+2018-03-30,Gate-controlled anisotropy in Aharonov-Casher spin interference: signatures of Dresselhaus spin-orbit inversion and spin phases,"The coexistence of Rashba and Dresselhaus spin-orbit interactions (SOIs) in
+semiconductor quantum wells leads to an anisotropic effective field coupled to
+carriers' spins. We demonstrate a gate-controlled anisotropy in Aharonov-Casher
+(AC) spin interferometry experiments with InGaAs mesoscopic rings by using an
+in-plane magnetic field as a probe. Supported by a perturbation-theory
+approach, we find that the Rashba SOI strength controls the AC resistance
+anisotropy via spin dynamic and geometric phases and establish ways to
+manipulate them by employing electric and magnetic tunings. Moreover, assisted
+by two-dimensional numerical simulations, we identify a remarkable anisotropy
+inversion in our experiments attributed to a sign change in the renormalized
+linear Dresselhaus SOI controlled by electrical means, which would open a door
+to new possibilities for spin manipulation.",1803.11371v2
+2010-01-07,Scattering Theory of Current-Induced Spin Polarization,"We construct a novel scattering theory to investigate magnetoelectrically
+induced spin polarizations. Local spin polarizations generated by electric
+currents passing through a spin-orbit coupled mesoscopic system are measured by
+an external probe. The electrochemical and spin-dependent chemical potentials
+on the probe are controllable and tuned to values ensuring that neither charge
+nor spin current flow between the system and the probe, on time-average. For
+the relevant case of a single-channel probe, we find that the resulting
+potentials are exactly independent of the transparency of the contact between
+the probe and the system. Assuming that spin relaxation processes are absent in
+the probe, we therefore identify the local spin-dependent potentials in the
+sample at the probe position, and hence the local current-induced spin
+polarization, with the spin-dependent potentials in the probe itself. The
+statistics of these local chemical potentials is calculated within random
+matrix theory. While they vanish on spatial and mesoscopic average, they
+exhibit large fluctuations, and we show that single systems typically have spin
+polarizations exceeding all known current-induced spin polarizations by a
+parametrically large factor. Our theory allows to calculate quantum
+correlations between spin polarizations inside the sample and spin currents
+flowing out of it. We show that these large polarizations correlate only weakly
+with spin currents in external leads, and that only a fraction of them can be
+converted into a spin current in the linear regime of transport, which is
+consistent with the mesoscopic universality of spin conductance fluctuations.
+We numerically confirm the theory.",1001.1125v2
+2013-03-14,Spin polarization in the Hubbard model with Rashba spin-orbit coupling on a ladder,"The competition between on-site Coulomb repulsion and Rashba spin-orbit
+coupling (RSOC) is studied on two-leg ladders by numerical techniques. By
+studying persistent currents in closed rings by exact diagonalization, it is
+found that the contribution to the current due to the RSOC V_{SO}, for a fixed
+value of the Hubbard repulsion U reaches a maximum at intermediate values of
+V_{SO}. By increasing the repulsive Hubbard coupling U, this spin-flipping
+current is suppressed and eventually it becomes opposite to the spin-conserving
+current. The main result is that the spin accumulation defined as the relative
+spin polarization between the two legs of the ladder is enhanced by U. Similar
+results for this Hubbard-Rashba model are observed for a completely different
+setup in which two halves of the ladders are connected to a voltage bias and
+the ensuing time-dependent regime is studied by the density
+matrix-renormalization group technique. It is also interesting a combined
+effect between V_{SO} and U leading to a strong enhancement of
+antiferromagnetic order which in turn may explain the observed behavior of the
+spin-flipping current. The implications of this enhancement of the spin-Hall
+effect with electron correlations for spintronic devices is discussed.",1303.3613v3
+2024-04-09,Excited-State Dynamics and Optically Detected Magnetic Resonance of Solid-State Spin Defects from First Principles,"Optically detected magnetic resonance (ODMR) is an efficient and reliable
+method that enables initialization and readout of spin states through
+spin-photon interface. In general, high quantum efficiency and large
+spin-dependent photoluminescence (PL) contrast are desirable for reliable
+quantum information readout. However, reliable prediction of the ODMR contrast
+from first-principles requires accurate description of complex spin
+polarization mechanisms of spin defects. These mechanisms often include
+multiple radiative and nonradiative processes in particular intersystem
+crossing (ISC) among multiple excited electronic states. In this work we
+present our implementation of the first-principles ODMR contrast, by solving
+kinetic master equation with calculated rates from ab initio electronic
+structure methods then benchmark the implementation on the case of the
+negatively-charged nitrogen vacancy (NV) center in diamond. We show the
+importance of correct description of multi-reference electronic states for
+accurate prediction of excitation energy, spin-orbit coupling, and the rate of
+ISC. Moreover, we underscore the importance of pseudo Jahn-Teller effect for
+the spin-orbit coupling, and the dynamical Jahn-Teller effect for
+electron-phonon coupling, key factors determining ISC rates and ODMR contrast.
+We show good agreement between our first-principles calculations and the
+experimental ODMR contrast under magnetic field. We then demonstrate reliable
+predictions of magnetic field direction, pump power, and microwave frequency
+dependency, as important parameters for ODMR experiments. Our work clarifies
+the important excited-state relaxation mechanisms determining ODMR contrast and
+provides a predictive computational platform for spin polarization and optical
+readout of solid-state quantum defects from first principles.",2404.05917v1
+2000-01-18,Octupole Moment as a Hidden Order Parameter in Orbitally Degenerate f-Electron Systems,"Possibility of a novel pseudo-scalar (octupole) order is studied
+theoretically for orbitally degenerate systems with strong spin-orbit coupling
+such as Ce$_x$La$_{1-x}$B$_6$. It is discussed that coexistence of an octupole
+order parameter and antiferromagnetic fluctuation should lead to drastic
+softening of the elastic constant by a mode-mixing effect. Nonlinear coupling
+between dipole, quadrupole and octupole fluctuations is taken into account in
+terms of a Ginzburg-Landau-type functional which is derived microscopically
+through path integral.",0001238v1
+2007-05-21,Dimer phases in quantum antiferromagnets with orbital degeneracy,"We study and solve the ground-state problem of a microscopic model for a
+family of orbitally degenerate quantum magnets. The orbital degrees of freedom
+are assumed to have directional character and are represented by static
+Potts-like variables. In the limit of vanishing Hund's coupling, the
+ground-state manifold of such a model is spanned by the hard-core dimer (spin
+singlet) coverings of the lattice. The extensive degeneracy of dimer coverings
+is lifted at a finite Hund's coupling through an order-out-of-disorder
+mechanism by virtual triplet excitations. The relevance of our results to
+several experimentally studied systems is discussed.",0705.2990v2
+2007-09-22,Orbital Domain Dynamics in a Doped Manganite,"The coupling of multiple degrees of freedom - charge, spin, and lattice - in
+manganites has mostly been considered at the microscopic level. However, on
+larger length scales, these correlations may be affected by strain and
+disorder, which can lead to short range order in these phases and affect the
+coupling between them. To better understand these effects, we explore the
+dynamics of orbitally ordered domains in a half-doped manganite near the
+orbital ordering phase transition. Our results suggest that the domains are
+largely static, and exhibit only slow fluctuations near domain boundaries.",0709.3558v1
+2000-10-02,"Large Orbital Magnetic Moment in Feo, Fes and Febr2","Magnetic moment of the Fe2+ ion in FeO, FeS and FeBr2 has been calculated
+within the quantum atomistic solid-state theory to substantially exceed a value
+of 4 muB in the magnetically-ordered state at 0 K. In all compounds the large
+orbital moment, of 0.7 - 1.1 muB, has been revealed. Our calculations show that
+for the meaningful analysis of electronic and magnetic properties of FeO, FeS
+and FeBr2 the intra-atomic spin-orbit coupling is essentially important and
+that the orbital moment is largely unquenched in 3d- ion containing compounds.",0010032v1
+2000-12-14,"Comment on ""Orbitally degenerate spin-1 model for insulating V2O3""","We criticize the model proposed by Mila et al. (Phys.Rev.Lett. 85 (2000)
+1714) for the description of the V3+ ion in V2O3 by pointing out that it is
+completely artificial because the condition about the degenerate (doublet)
+orbital ground state required for the authors' model cannot be realized in the
+reality. We claim that the V3+ ion should be considered as described by the
+quantum numbers S=1 and L=3 and with taking into account the orbital moment and
+the intra-atomic spin-orbit coupling. PACS: 71.70.E, 75.10.D",0012257v1
+2002-09-02,One-Dimensional Confinement and Enhanced Jahn-Teller Instability in LaVO$_3$,"Ordering and quantum fluctuations of orbital degrees of freedom are studied
+theoretically for LaVO$_3$ in spin-C-type antiferromagnetic state. The
+effective Hamiltonian for the orbital pseudospin shows strong one-dimensional
+anisotropy due to the negative interference among various exchange processes.
+This significantly enhances the instability toward lattice distortions for the
+realistic estimate of the Jahn-Teller coupling by first-principle LDA+$U$
+calculations, instead of favoring the orbital singlet formation. This explains
+well the experimental results on the anisotropic optical spectra as well as the
+proximity of the two transition temperatures for spin and orbital orderings.",0209021v2
+2005-02-06,Interplay of orbitally polarized and magnetically ordered phases in doped transition metal oxides,"We investigate the magnetic instabilities of the two-dimensional model of
+interacting e_g electrons for hole doping away from two electrons per site in
+the mean-field approximation. In particular, we address the occurrence of
+orbitally polarized states due to the inequivalent orbitals, and their
+interplay with ferromagnetic and antiferromagnetic spin order. The role played
+by the Hund's exchange coupling J_H and by the crystal field orbital splitting
+E_z in stabilizing one of the competing phases is discussed in detail.",0502158v1
+2006-02-08,Orbital evolution of a test particle around a black hole: Indirect determination of the self force in the post Newtonian approximation,"Comparing the corrections to Kepler's law with orbital evolution under a self
+force, we extract the finite, already regularized part of the latter in a
+specific gauge. We apply this method to a quasi-circular orbit around a
+Schwarzschild black hole of an extreme mass ratio binary, and determine the
+first- and second-order conservative gravitational self force in a post
+Newtonian expansion. We use these results in the construction of the
+gravitational waveform, and revisit the question of the relative contribution
+of the self force and spin-orbit coupling.",0602032v2
+2008-08-08,Orbital ordering in undoped manganites via a generalized Peierls instability,"We study the ground state orbital ordering of $LaMnO_3$, at weak
+electron-phonon coupling, when the spin state is A-type antiferromagnet. We
+determine the orbital ordering by extending to our Jahn-Teller system a
+recently developed Peierls instability framework for the Holstein model [1]. By
+using two-dimensional dynamic response functions corresponding to a mixed
+Jahn-Teller mode, we establish that the $Q_2$ mode determines the orbital
+order.",0808.1174v3
+2009-10-13,Size-dependent orbital symmetry of hole ground states in CdS nanocrystals,"Using time-resolved photoluminescence spectroscopy, we studied the electronic
+levels of semiconductor nanocrystals (NCs) with small spin-orbit coupling such
+as CdS. Low temperature radiative rates indicate that the lowest energy
+transition changes from orbital allowed to orbital forbidden with decreasing NC
+size. Our results are well explained by a size-dependent hierarchy of s- and
+p-orbital hole levels that is in agreement with theoretical predictions. Around
+the critical NC radius of ~2 nm, we observe an anti-crossing of s- and
+p-orbital hole levels and large changes in transition rates.",0910.2481v1
+2015-05-25,Highly Accurate Measurement of the Electron Orbital Magnetic Moment,"We propose to accurately determine the orbital magnetic moment of the
+electron by measuring, in a Magneto-Optical or Ion trap, the ratio of the Lande
+g-factors in two atomic states. From the measurement of (gJ1/gJ2), the quantity
+A, which depends on the corrections to the electron g-factors can be extracted,
+if the states are LS coupled. Given that highly accurate values of the
+correction to the spin g-factor are currently available, accurate values of the
+correction to the orbital g-factor may also be determined. At present, (-1.8
++/- 0.4) x 10-4 has been determined as a correction to the electron orbital
+g-factor, by using earlier measurements of the ratio gJ1/gJ2, made on the
+Indium 2P1/2 and 2P3/2 states.",1505.08140v1
+2019-07-31,Multi-orbital tight binding model for cavity-polariton lattices,"In this work we present a tight-binding model that allows to describe with a
+minimal amount of parameters the band structure of exciton-polariton lattices.
+This model based on $s$ and $p$ non-orthogonal photonic orbitals faithfully
+reproduces experimental results reported for polariton graphene ribbons. We
+analyze in particular the influence of the non-orthogonality, the
+inter-orbitals interaction and the photonic spin-orbit coupling on the
+polarization and dispersion of bulk bands and edge states.",1907.13621v1
+2004-09-11,Controlling Spin Qubits in Quantum Dots,"We review progress on the spintronics proposal for quantum computing where
+the quantum bits (qubits) are implemented with electron spins. We calculate the
+exchange interaction of coupled quantum dots and present experiments, where the
+exchange coupling is measured via transport. Then, experiments on single spins
+on dots are described, where long spin relaxation times, on the order of a
+millisecond, are observed. We consider spin-orbit interaction as sources of
+spin decoherence and find theoretically that also long decoherence times are
+expected. Further, we describe the concept of spin filtering using quantum dots
+and show data of successful experiments. We also show an implementation of a
+read out scheme for spin qubits and define how qubits can be measured with high
+precision. Then, we propose new experiments, where the spin decoherence time
+and the Rabi oscillations of single electrons can be measured via charge
+transport through quantum dots. Finally, all these achievements have promising
+applications both in conventional and quantum information processing.",0409294v1
+2005-03-24,Edge Spin Current and Spin Polarization in Quantum Hall Regime,"We study the edge spin current and spin polarization in a two-dimensional
+electron gas with spin-orbit coupling in the presence of a perpendicular
+magnetic field. The edge effect removes the degeneracy of Landau levels due to
+the competition between the Rashba coupling and the Zeeman splitting, which
+exists in the bulk. Large spin edge current and non-linear response to an
+electric field are found when the two levels are degenerated in the bulk. It is
+found that he spin current is proportional to spin polarization along the
+y-direction in an finite magnetic field, which provides a way to extract the
+spin current in the system.",0503592v2
+2006-07-10,Boltzmann Equations for Spin and Charge Relaxations in Superconductors,"In a superconductor coupled with a ferromagnetic metal, spin and charge
+imbalances can be induced by injecting spin-polarized electron current from the
+ferromagnetic metal. We theoretically study a nonequilibrium distribution of
+quasiparticles in the presence of spin and charge imbalances. We show that four
+distribution functions are needed to characterize such a nonequilibrium
+situation, and derive a set of linearized Boltzmann equations for them by
+extending the argument by Schmid and Sch\""{o}n based on the quasiclassical
+Green's function method. Using the Boltzmann equations, we analyze the spin
+imbalance in a thin superconducting wire weakly coupled with a ferromagnetic
+electrode. The spin imbalance induces a shift $\delta\mu$ ($- \delta \mu$) of
+the chemical potential for up-spin (down-spin) quasiparticles. We discuss how
+$\delta \mu$ is relaxed by spin-orbit impurity scattering.",0607227v1
+2010-04-25,Single Spin Detection with a Carbon Nanotube Double Quantum Dot,"Spin qubits defined in carbon nanotube quantum dots are of considerable
+interest for encoding and manipulating quantum information because of the long
+electron spin coherence times expected. However, before carbon nanotubes can
+find applications in quantum information processing schemes, we need to
+understand and control the coupling between individual electron spins and the
+interaction between the electron spins and their environment. Here we make use
+of spin selection rules to directly measure - and demonstrate control of - the
+singlet-triplet exchange coupling between two carbon nanotube quantum dots. We
+furthermore elucidate the effects of spin-orbit interaction on the electron
+transitions and investigate the interaction of the quantum dot system with a
+single impurity spin - the ultimate limit in spin sensitivity.",1004.4377v1
+2014-04-09,Spin Transport in non-inertial frame,"The influence of acceleration and rotation on spintronic applications is
+theoretically investigated. In our formulation, considering a Dirac particle in
+a non-inertial frame, different spin related aspects are studied. The spin
+current appearing due to the inertial spin-orbit coupling (SOC) is enhanced by
+the interband mixing of the conduction and valence band states. Importantly,
+one can achieve a large spin current through the $\vec{k}. \vec{p}$ method in
+this non-inertial frame. Furthermore, apart from the inertial SOC term due to
+acceleration, for a particular choice of the rotation frequency, a new kind of
+SOC term can be obtained from the spin rotation coupling (SRC). This new kind
+of SOC is of Dresselhaus type and controllable through the rotation frequency.
+In the field of spintronic applications, utilizing the inertial SOC and SRC
+induced SOC term, theoretical proposals for the inertial spin filter, inertial
+spin galvanic effect are demonstrated. Finally, one can tune the spin
+relaxation time in semiconductors by tuning the non-inertial parameters.",1404.2376v1
+2020-01-07,Flexoelectric effect mediated spin-to-charge conversion at amorphous-Si thin film interfaces,"Interfacial spin to charge conversion arises due to an electric potential
+perpendicular to the interface. The electric potential can be artificially
+induced, for example, using ferroelectric and piezoelectric thin films at the
+interface. An alternate way to induce the electric potential could be
+flexoelectric field. The flexoelectricity can be observed in all the material
+that either have or lack inversion symmetry, additionally no large gate bias is
+needed. In this experimental study, we report large spin to charge conversion
+(spin-Hall angle- 0.578) at Ni80Fe20/amorphous-Si interfaces attributed to
+flexoelectricity mediated Rashba spin-orbit coupling. The flexoelectricity at
+the interface also gave rise to interlayer spin-acoustic phonon or
+flexo-magnetoelastic coupling. In addition to spin-charge conversion, the
+strained interfaces also led to almost three-fold increase in anomalous Nernst
+effect. This strain engineering for spin dependent thermoelectric behavior at
+room temperature opens a new window to the realization of spintronics and
+spin-caloritronics devices.",2001.01822v2
+2019-02-28,Microscopic mechanism for higher-spin Kitaev model,"The spin S=$\frac{1}{2}$ Kitaev honeycomb model has attracted significant
+attention, since emerging candidate materials have provided a playground to
+test non-Abelian anyons. The Kitaev model with higher spins has also been
+theoretically studied, as it may offer another path to a quantum spin liquid.
+However, a microscopic route to achieve higher spin Kitaev models in solid
+state materials has not been rigorously derived. Here we present a theory of
+the spin S=1 Kitaev interaction in two-dimensional edge-shared octahedral
+systems. Essential ingredients are strong spin-orbit coupling in anions and
+strong Hund's coupling in transition metal cations. The S=1 Kitaev and
+ferromagnetic Heisenberg interactions are generated from superexchange paths.
+Taking into account the antiferromagnetic Heisenberg term from direct-exchange
+paths, the Kitaev interaction dominates the physics of S=1 system. Using exact
+diagonalization technique, we show a finite regime of S=1 spin liquid in the
+presence of the Heisenberg interaction. Candidate materials are proposed, and
+generalization to higher spins is discussed.",1903.00011v1
+2020-06-18,Intrinsic Spin Photogalvanic Effect in Nonmagnetic Insulator,"We show that with the help of spin-orbit coupling, nonlinear light-matter
+interactions can efficiently couple with spin and valley degrees of freedom.
+This revealed spin photogalvanic effect can generate the long-time pursued
+intrinsic pure spin current (PSC) in non-centrosymmetric nonmagnetic
+insulators. Different from the spin and valley Hall effect, such a photo-driven
+spin current is universal and can be generated without external bias field.
+Using first-principles simulation, we study monolayer transition metal
+dichalcogenides (TMDs) to demonstrate this effect and confirm an enhanced PSC
+under linearly polarized photoexcitation. The amplitude of the PSC is one order
+larger than that of the charge current observed in monolayer TMDs. This exotic
+nonlinear light-spin interaction indicates that light can be utilized as a
+rapid fashion to manipulate the spin-polarized current, which is crucial for
+future low-dissipation nanodevices.",2006.10690v1
+2021-03-17,Spin/valley coupled dynamics of electrons and holes at the ${\text{MoS}_{2}-\text{MoSe}_{2}}$ interface,"The coupled spin and valley degrees of freedom in transition metal
+dichalcogenides (TMDs) are considered a promising platform for information
+processing. Here, we use a TMD heterostructure
+${\text{MoS}_{2}-\text{MoSe}_{2}}$ to study optical pumping of spin/valley
+polarized carriers across the interface and to elucidate the mechanisms
+governing their subsequent relaxation. By applying time-resolved Kerr and
+reflectivity spectroscopies, we find that the photoexcited carriers conserve
+their spin for both tunneling directions across the interface. Following this,
+we measure dramatically different spin/valley depolarization rates for
+electrons and holes, $\sim 30\,{\text{ns}}^{-1}$ and $< 1\,{\text{ns}}^{-1}$,
+respectively and show that this difference relates to the disparity in the
+spin-orbit splitting in conduction and valence bands of TMDs. Our work provides
+insights into the spin/valley dynamics of free carriers unaffected by complex
+excitonic processes and establishes TMD heterostructures as generators of spin
+currents in spin/valleytronic devices.",2103.09934v2
+2008-05-05,"Orbital degeneracy, Hund's coupling, and band ferromagnetism: effective quantum parameter, suppression of quantum corrections, and enhanced stability","An effective quantum parameter is obtained for the band ferromagnet in terms
+of orbital degeneracy and Hund's coupling. This quantum parameter determines,
+in analogy with 1/N for the generalized Hubbard model and 1/S for quantum spin
+systems, the strength of quantum corrections to spin stiffness and spin-wave
+energies. Quantum corrections are obtained by incorporating correlation effects
+in the form of self-energy and vertex corrections within a
+spin-rotationally-symmetric approach in which the Goldstone mode is explicitly
+preserved order by order. It is shown that even a relatively small Hund's
+coupling is rather efficient in strongly suppressing quantum corrections,
+especially for large N, resulting in strongly enhanced stability of the
+ferromagnetic state. This mechanism for the enhancement of ferromagnetism by
+Hund's coupling implicitly involves a subtle interplay of lattice,
+dimensionality, band dispersion, spectral distribution, and band filling
+effects.",0805.0470v1
+2015-02-16,Stueckelberg interferometry using periodically driven spin-orbit coupled Bose-Einstein condensates,"We study the single-particle dispersion of a spin-orbit coupled (SOC)
+Bose-Einstein condensate (BEC) under the periodical modulation of the Raman
+coupling. This modulation introduces a further coupling of the SOC dressed
+eigenlevels, thus creating a second generation of modulation-dressed
+eigenlevels. Theoretical calculations show that these modulation-dressed
+eigenlevels feature a pair of avoided crossings and a richer spin-momentum
+locking, which we observe using BEC transport measurements. Furthermore, we use
+the pair of avoided crossings to engineer a tunable Stueckelberg interferometer
+that gives interference fringes in the spin polarization of BECs.",1502.04722v2
+2015-03-23,Anisotropic Magnetic Couplings and Structure-Driven Canted to Collinear Transitions in Spin-orbit Coupled Sr2IrO4,"We put forward a scheme to study the anisotropic magnetic couplings in
+Sr2IrO4 by mapping fully relativistic constrained noncollinear density
+functional theory including an on-site Hubbard U correction onto a general spin
+model Hamiltonian. This procedure allows for the simultaneous account and
+direct control of the lattice, spin and orbital interactions within a fully ab
+initio scheme. We compute the isotropic, single site anisotropy and
+Dzyaloshinskii-Moriya (DM) coupling parameters, and clarify that the origin of
+the canted magnetic state in Sr2IrO4 arises from the interplay between
+structural distortions and the competition between isotropic exchange and DM
+interactions. A complete magnetic phase diagram with respect to the tetragonal
+distortion and the rotation of IrO6 octahedra is constructed, revealing the
+presence of two types of canted to collinear magnetic transitions: a spin-flop
+transition with increasing tetragonal distortion and a complete quenching of
+the basal weak ferromagnetic moment below a critical octahedral rotation.",1503.06753v2
+2015-11-30,Tricriticalities and Quantum Phases in Spin-Orbit-Coupled Spin-$1$ Bose Gases,"We study the zero-temperature phase diagram of a spin-orbit-coupled
+Bose-Einstein condensate of spin $1$, with equally weighted Rashba and
+Dresselhaus couplings. Depending on the antiferromagnetic or ferromagnetic
+nature of the interactions, we find three kinds of striped phases with
+qualitatively different behaviors in the modulations of the density profiles.
+Phase transitions to the zero-momentum and the plane-wave phases can be induced
+in experiments by independently varying the Raman coupling strength and the
+quadratic Zeeman field. The properties of these transitions are investigated in
+detail, and the emergence of tricritical points, which are the direct
+consequence of the spin-dependent interactions, is explicitly discussed.",1511.09225v2
+2017-02-15,Bosons with incommensurate potential and spin-orbit coupling,"We chart out the phase diagram of ultracold `spin-half' bosons in a
+one-dimensional optical lattice in the presence of Aubry-Andr\'e (AA) potential
+and with spin-orbit (SO) and Raman couplings investigating the transition from
+superfluid (SF) to localized phases and the existence of density wave phase for
+nearest-neighbor interaction (NNI). We show that the presence of SO coupling
+and AA potential leads to a novel spin-split momentum distribution of the
+bosons in the localized phase near the boundary with the SF phase, which can
+act as a signature of such a transition. We also obtain the level statistics of
+the bosons in the superfluid phase with finite NNI and demonstrate its change
+from Gaussian Unitary Ensemble (GUE) to Gaussian Orthogonal Ensemble (GOE) as a
+function of the Raman coupling. We discuss experiments which can test our
+theory.",1702.04714v1
+2018-11-01,Performance of trajectory surface hopping method in the treatment of ultrafast intersystem crossing dynamics,"We carried out extensive studies to examine the performance of the
+fewest-switches surface hopping method in the description of the ultrafast
+intersystem crossing dynamic of various singlet-triplet (S-T) models by
+comparison with the results of the exact full quantum dynamics. Different
+implementation details and some derivative approaches were examined. As
+expected, it is better to perform the trajectory surface hopping calculations
+in the spin-adiabatic representation or by the local diabatization approach,
+instead of in the spin-diabatic representation. The surface hopping method
+provides reasonable results for the short-time dynamics in the S-T model with
+weak spin-orbital coupling (diabatic coupling), although it does not perform
+well in the models with strong spin-orbital coupling (diabatic coupling). When
+the system accesses the S-T potential energy crossing with rather high kinetic
+energy, the trajectory surface hopping method tends to produce the good
+description of the nonadiabatic intersystem crossing dynamics. The impact of
+the decoherence correction on the performance of the trajectory surface hopping
+is system dependent. It improves the result accuracy in many cases, while its
+influence may also be minor for other cases.",1811.00254v2
+2010-05-27,Renormalized parameters and perturbation theory for an n-channel Anderson model with Hund's rule coupling,"We extend the renormalized perturbation theory for the single impurity
+Anderson model to the n-channel model with a Hund's rule coupling, and show
+that the exact results for the spin, orbital and charge susceptibilities, as
+well as the leading low temperature dependence for the resistivity, are
+obtained by working to second order in the renormalized couplings. A universal
+relation is obtained between the renormalized parameters, independent of n, in
+the Kondo regime. An expression for the dynamic spin susceptibility is also
+derived by taking into account repeated quasiparticle scattering, which is
+asymptotically exact in the low frequency regime and satisfies the
+Korringa-Shiba relation. The renormalized parameters, including the
+renormalized Hund's rule coupling, are deduced from numerical renormalization
+group calculations for the model for the case n=2. The results confirm
+explicitly the universal relations between the parameters in the Kondo regime.
+Using these results we evaluate the spin, orbital and charge susceptibilities,
+temperature dependence of the low temperature resistivity and dynamic spin
+susceptibility for the particle-hole symmetric n=2 model.",1005.5113v1
+2019-07-04,Topological spinor vortex matter on spherical surface induced by non-Abelian spin-orbital-angular-momentum coupling,"We provide an explicit way to implement non-Abelian
+spin-orbital-angular-momentum (SOAM) coupling in spinor Bose-Einstein
+condensates using magnetic gradient coupling. For a spherical surface trap
+addressable using high-order Hermite-Gaussian beams, we show that this system
+supports various degenerate ground states carrying different total angular
+momenta $\mathbf{J}$, and the degeneracy can be tuned by changing the strength
+of SOAM coupling. For weakly interacting spinor condensates with $f=1$, the
+system supports various meta-ferromagnetic phases and meta-polar states
+described by quantized total mean angular momentum $|\langle \mathbf{J}
+\rangle|$. Polar states with $Z_2$ symmetry and Thomson lattices formed by
+defects of spin vortices are also discussed. The system can be used to prepare
+various stable spin vortex states with nontrivial topology, and serve as a
+platform to investigate strong-correlated physics of neutral atoms with tunable
+ground-state degeneracy.",1907.02216v1
+2012-05-14,Magnetic phases of bosons with synthetic spin-orbit coupling in optical lattices,"We investigate magnetic properties in the superfluid and Mott-insulating
+states of two-component bosons with spin-orbit (SO) coupling in 2D square
+optical lattices. The spin-independent hopping integral $t$ and SO coupled one
+$\lambda $are fitted from band structure calculations in the continuum, which
+exhibit oscillations as increasing SO coupling strength. The magnetic
+superexchange model is derived in the Mott-insulating state with one-particle
+per-site, characterized by the Dzyaloshinsky-Moriya (DM) interaction. In the
+limit of $|\lambda|\ll |t|$, we find a spin spiral Mott state whose pitch value
+is the same as that in the incommensurate superfluid state, while in the
+opposite limit $|t| \ll |\lambda|$, the ground state can be found by a dual
+transformation to the $|\lambda|\ll|t|$ limit.",1205.3116v3
+2020-10-06,Interplay of spin-orbit coupling and Coulomb interaction in ZnO-based electron system,"Spin-orbit coupling (SOC) is pivotal for various fundamental spin-dependent
+phenomena in solids and their technological applications. In semiconductors,
+these phenomena have been so far studied in relatively weak electron-electron
+interaction regimes, where the single electron picture holds. However, SOC can
+profoundly compete against Coulomb interaction, which could lead to the
+emergence of unconventional electronic phases. Since SOC depends on the
+electric field in the crystal including contributions of itinerant electrons,
+electron-electron interactions can modify this coupling. Here we demonstrate
+the emergence of SOC effect in a high-mobility two-dimensional electron system
+in a simple band structure MgZnO/ZnO semiconductor. This electron system
+features also strong electron-electron interaction effects. By changing the
+carrier density with Mg-content, we tune the SOC strength and achieve its
+interplay with electron-electron interaction. These systems pave a way to
+emergent spintronic phenomena in strong electron correlation regime and to the
+formation of novel quasiparticles with the electron spin strongly coupled to
+the density.",2010.02461v1
+2022-02-24,Spin-Orbit Interaction of Light Enabled by Negative Coupling in High Quality Factor Optical Metasurfaces,"We study the negative couplings amid local resonances of photonic
+metasurfaces. In our analysis, we discover pseudo-spin-orbit coupled bulk modes
+leading to lines of circularly polarized radiation eigenstates in
+two-dimensional momentum space which were considered to exist only in
+three-dimensions. Our theoretical model is exemplified via a guided resonance
+dielectric metasurface that possesses Type-II Non-Hermitian diabolical points,
+from where the circular polarization lines emanate. The designed metasurface
+carries circular polarized radiation eigenstates in both the 0th and the 1st
+diffraction orders, allowing spin-selective light deflections. The high quality
+factor nature and field enhancement of the designed metasurface could lead to
+applications for spin-selective sensing, beam control and nonlinear optics. Our
+findings open a gateway for the design of near-field couplings assisted
+metasurfaces.",2202.11980v1
+2023-06-26,Quantum phases and spectrum of collective modes in a spin-1 BEC with spin-orbital-angular-momentum coupling,"Motivated by the recent experiments [Chen et al., Phys. Rev. Lett 121, 113204
+(2018), Chen et al., Phys. Rev. Lett. 121, 250401 (2018)], we investigate the
+low-lying excitation spectrum of the ground-state phases of
+spin-orbital-angular-momentum-coupled (SOAM-coupled) spin-1 condensates.At
+vanishing detuning, a ferromagnetic SOAM-coupled spin-1 BEC can have two
+ground-state phases, namely coreless and polar-core vortex states, whereas an
+antiferromagnetic BEC supports only polar-core vortex solution. The angular
+momentum per particle, longitudinal magnetization, and excitation frequencies
+display discontinuities across the phase boundary between the coreless vortex
+and polar-core vortex phases. The low-lying excitation spectrum evaluated by
+solving the Bogoliubov-de-Gennes equations is marked by avoided crossings and
+hence the hybridization of the spin and density channels. The spectrum is
+further confirmed by the dynamical evolution of the ground state subjected to a
+perturbation suitable to excite a density or a spin mode and a variational
+analysis for the density-breathing mode.",2306.14669v2
+2023-12-11,Non-constant geometric curvature for tailored spin-orbit coupling and chirality in superconductor-magnet heterostructures,"We show that tailoring the geometric curvature profile of magnets can be used
+for bespoke design of an effective non-relativistic spin-orbit coupling, which
+may be used to control proximity effects if the magnet is coupled to a
+superconductor. We consider proximity-coupled one-dimensional magnetic wires
+with variable curvatures, specifically three distinct shapes classified as J-,
+C-, and S-type. We demonstrate a chirality-dependent spin polarization of the
+superconducting correlations, and show the role of curvature in determining the
+ground state of mixed-chirality junctions. We speculate on how this may be
+implemented in novel device design, and include analysis of its usage in a
+spin-triplet SQUID",2312.06774v2
+1995-03-01,Quantum Hall effect in spin-degenerate Landau levels: Spin-orbit enhancement of the conductivity,"The quantum Hall regime in a smooth random potential is considered when two
+disorder-broadened Zeeman levels overlap strongly. Spin-orbit coupling is found
+to cause a drastic change in the percolation network which leads to a strong
+enhancement of the dissipative conductivity at finite temperature, provided the
+Fermi level $E_F$ lies between the energies of two delocalized states
+$E=\pm\Delta$, $2\Delta$ being the Zeeman splitting. The conductivity is shown
+to exhibit a box-like behavior with changing magnetic field: $\sigma_{xx}$ is
+$\sim e^2/h$ at $|E_F|<\Delta$ and exponentially small otherwise. Two peaks of
+$\sigma_{xx}$ arising as $T\to 0$ are found to be strongly asymmetric.",9503005v1
+1998-01-12,Quantum interference and electron-electron interactions at strong spin-orbit coupling in disordered systems,"Transport and thermodynamic properties of disordered conductors are
+considerably modified when the angle through which the electron spin precesses
+due to spin-orbit interaction (SOI) during the mean free time becomes
+significant. Cooperon and Diffusion equations are solved for the entire range
+of strength of SOI. The implications of SOI for the electron-electron
+interaction and interference effects in various experimental settings are
+discussed.",9801095v1
+1998-09-30,Josephson Current between Triplet and Singlet Superconductors,"The Josephson effect between triplet and singlet superconductors is studied.
+Josephson current can flow between triplet and singlet superconductors due to
+the spin-orbit coupling in the spin-triplet superconductor but it is finite
+only when triplet superconductor has $L_z=-S_z=\pm 1$, where $L_z$ and $S_z$
+are the perpendicular components of orbital angular momentum and spin angular
+momentum of the triplet Cooper pairs, respectively. The recently observed
+temperature and orientational dependence of the critical current through a
+Josephson junction between UPt$_3$ and Nb is investigated by considering a
+non-unitary triplet state.",9809403v1
+2004-08-10,Key Role of Orbital Anisotropy in Geometrically Frustrated Electron System,"By using the density matrix renormalization group method, we investigate
+ground- and excited-state properties of the e_g-orbital degenerate Hubbard
+model at quarter filling for two kinds of lattices, zigzag chain and ladder. In
+the zigzag chain, the system is effectively regarded as a decoupled double
+chain of the S=1/2 antiferromagnetic Heisenberg model, and the spin gap is
+approximately zero, similar to the case of weakly coupled Heisenberg chains. On
+the other hand, in the ladder, the spin correlation on the rung remains robust
+and the spin gap exists.",0408197v1
+2006-10-23,Magnetic properties and the electronic structure of LiCoO_2,"We have described properties of LiCoO_2 within the Quantum Atomistic Solid
+State (QUASST) theory taking into account very strong electron correlations,
+predominantly of the intra-atomic origin, spin-orbit coupling and the detailed
+local crystallographic surroundings and its symmetry. Properties of LiCoO_2 are
+consistently explained together with NaCoO_2 and LaCoO_3 - in all of these
+compounds the Co^3+ ions occur in the low-spin state. This low-spin state is
+the effect of the relatively strong crystal-field interactions (B_4^z = +320 K
+<=> 10Dq = 3.3 eV) and is a manifestation of the very large orbital moment of
+the Co^3+ ion.",0610611v1
+2006-11-20,Crossover from diffusive to non-diffusive dynamics in the two-dimensional electron gas with Rashba spin-orbit coupling,"We present the calculation of the density matrix response function of the
+two-dimensional electron gas with Rashba spin-orbit interaction, which is
+applicable in a wide range of parameters covering the diffusive and
+non-diffusive, the dirty and the clean limits. A description of the crossover
+between the different regimes is thus provided as well. On the basis of the
+derived microscopic expressions we study the propagating charge and
+spin-polarization modes in the clean, non-diffusive regime, which is accessible
+in the modern experiments.",0611523v2
+1999-05-20,Phenomenological spin-orbit three-body force,"In order to improve the description of the N-d vector analyzing powers Ay and
+iT11 (the so-called Ay puzzle) a spin-orbit three-body force has been
+introduced. The L.S term in the NN potential has been modified including a
+two-parameter three-body function depending on the hyperradius \rho. The
+modification has been performed in channels where the pair nucleons (i,j) are
+coupled to spin Sij=1 and isospin Tij=1. Calculations have been done in the
+energy region from Elab=648 keV up to Elab=10 MeV. A noticeable improvement in
+the description of the polarization observables has been obtained",9905045v1
+2007-07-03,Spin-orbit-assisted electron-phonon interaction and the magnetophonon resonance in semiconductor quantum wells,"We introduce a spin-orbit assisted electron-phonon (e-ph) coupling mechanism
+for carriers in semiconductor quantum wells and predict qualitatively the form
+and shape of anticrossings between the cyclotron resonance (CR) and optical (LO
+and TO) phonons. Since this e-ph interaction involves the electron spin it
+makes the predicted TO-CR anticrossing dependent on the filling factor and
+therefore on the polarization of the 2D electron gas in the quantum well.",0707.0342v2
+2008-02-21,Coherent Control of spin-orbit precession with shaped laser pulses,"Spin precession in Rubidium atoms is investigated through a pump-probe
+technique. The excited wave packet corresponds to a precession of spin and
+orbital angular momentum around the total angular momentum. We show that using
+shaped laser pulses allows us to control this dynamics. With a Fourier
+transform limited pulse, the wave packet is initially prepared in the bright
+state (coupled to the initial state) whereas a pulse presenting a $\pi $ step
+in the spectral phase prepares the wave packet in the dark state (uncoupled to
+the initial state).",0802.2986v1
+2008-03-31,Anomalous Rashba spin-orbit interaction in InAs/GaSb quantum wells,"We investigate theoretically the Rashba spin-orbit interaction in InAs/GaSb
+quantum wells(QWs). We find that the Rashba spin-splitting (RSS) depends
+sensitively on the thickness of the InAs layer. The RSS exhibits nonlinear
+behavior for narrow InAs/GaSb QWs and the oscillating feature for wide
+InAs/GaSb QWs. The nonlinear and oscillating behaviors arise from the weakened
+and enhanced interband coupling. The RSS also show asymmetric features respect
+to the direction of the external electric field.",0803.4310v1
+2008-04-21,Quantum Hall ferromagnetic states and spin-orbit interactions in the fractional regime,"The competition between the Zeeman energy and the Rashba and Dresselhaus
+spin-orbit couplings is studied for fractional quantum Hall states by including
+correlation effects. A transition of the direction of the spin-polarization is
+predicted at specific values of the Zeeman energy. We show that these values
+can be expressed in terms of the pair-correlation function, and thus provide
+information about the microscopic ground state. We examine the particular
+examples of the Laughlin wavefunctions and the 5/2-Pfaffian state. We also
+include effects of the nuclear bath.",0804.3332v3
+2008-04-25,Side jump contribution to spin-orbit mediated Hall effects and Berry curvature,"Anomalous Hall effect and spin Hall effect originate due to spin-orbit
+coupling that in the Kohn-Luttinger ${\bf k}\cdot{\bf p}$ formalism is
+represented by anomalous terms in the coordinate and velocity operators.
+Relation of these operators to the Berry curvature in the momentum space is
+presented for electrons in GaAs type semiconductors. For centrosymmetric
+semiconductors, transformational properties of Berry curvature are discussed.",0804.4181v1
+2008-10-11,Quantum Criticality and the Alpha/Delta Puzzle,"In this paper we suggest a novel explanation for the alpha-delta transition
+in plutonium based on an analogy between the evolution of the actinide ground
+state as a function of spin orbit coupling and the behaviour of thin film
+superconductors in a magnetic field. The key point is that in metals with a low
+carrier density spin-orbit interactions give rise to low energy monopole-like
+solitons with quantized spin currents, which play much the same role as
+Abrikosov vortices in thin film superconductors. In alpha-plutonium these
+solitons form an ordered solid, while in impurity stabilized delta-plutonium
+they form a pair condensate.",0810.1984v1
+2009-05-29,Field Induced Orbital Antiferromagnetism in Mott Insulators,"We report on a new electromagnetic phenomenon that emerges in Mott
+insulators, i.e., materials that do not conduct electricity because of strong
+electronic Coulomb repulsion. The phenomenon manifests as antiferromagnetic
+ordering due to orbital electric currents which are spontaneously generated
+from the coupling between spin currents and an external homogenous magnetic
+field. This novel spin-charge current effect provides the mechanism to detect
+the so far elusive spin currents by means of unpolarized neutron scattering,
+nuclear magnetic resonance or muon spectroscopy. We illustrate this mechanism
+by solving a half-filled Hubbard model on a frustrated ladder, a simple but
+nontrivial case of strongly interacting electrons.",0905.4871v1
+2011-01-04,Spin-orbit coupling inactivity of Co$^{2+}$ ion in geometrically frustrated magnet GeCo$_2$O$_4$,"We report single-crystal neutron diffraction studies on a spinel
+antiferromagnet GeCo$_2$O$_4$, which exhibits magnetic order with a trigonal
+propagation vector and tetragonal lattice expansion ($c/a\simeq1.001$) below
+$T_{\rm N}=21$ K. For this inconsistency between spin and lattice in symmetry,
+magnetic Bragg reflections with a tetragonal propagation vector were discovered
+below $T_{\rm N}$. We discuss spin and orbital states of Co$^{2+}$ ion
+underlying the new magnetic component.",1101.0685v1
+2011-05-12,Probing anisotropic superfluidity of rashbons in atomic Fermi gases,"Motivated by the prospect of realizing a Fermi gas of $^{40}$K atoms with a
+synthetic non-Abelian gauge field, we investigate theoretically a strongly
+interacting Fermi gas in the presence of a Rashba spin-orbit coupling. As the
+two-fold spin degeneracy is lifted by spin-orbit interaction, bound pairs with
+mixed singlet and triplet pairings (referred to as rashbons) emerge, leading to
+an anisotropic superfluid. We show that this anisotropic superfluidity can be
+probed via measuring the momentum distribution and single-particle spectral
+function in a trapped atomic $^{40}$K cloud near a Feshbach resonance.",1105.2488v1
+2011-12-20,Magnetization of a homogeneous two dimensional fermion gas with repulsive contact interaction and Rashba spin-orbit potential,"The z axis magnetization of a two dimensional electron gas with contact
+repulsive interaction and in presence of a Rashba potential is computed by
+means of quantum field theory at second order. A striking effect of the pure
+Rashba interaction is that of hindering spin alignment along the z direction.
+Evidence of transition at critical repulsive interaction coupling constant is
+still found. The degree of magnetization, however, shows a clear dependence on
+the spin-orbit interaction strength. Furthermore, the transition to magnetized
+state appears to be smoothed by the presence of the Rashba interaction.",1112.4731v1
+2013-10-23,Dynamics of the Dicke model close to the classical limit,"We study the dynamical properties of the Dicke model for increasing spin
+length, as the system approaches the limit of a classical spin. First, we
+describe the emergence of collective excitations above the groundstate that
+converge to the coupled spin-oscillator oscillations found in the classical
+limit. The corresponding Green functions reveal quantum dynamical signatures
+close to the superradiant quantum phase transition. Second, we identify
+signatures of classical quasi-periodic orbits in the quantum time evolution
+using numerical time-propagation of the wave function. The resulting phase
+space plots are compared to the classical trajectories. We complete our study
+with the analysis of individual eigenstates close to the quasi-periodic orbits.",1310.6140v1
+2014-09-05,Induced p-wave Superfluidity in Imbalanced Fermi Gases in a Synthetic Gauge Field,"We study pairing formation and the appearance of induced spin-triplet p-wave
+superfluidity in dilute three-dimensional imbalanced Fermi gases in the
+presence of a uniform non-Abelian gauge field. This gauge field generates a
+synthetic Rashba-type spin-orbit interaction which has remarkable consequences
+in the induced p-wave pairing gaps. Without the synthetic gauge field, the
+p-wave pairing occurs in one of the components due to the induced
+(second-order) interaction via an exchange of density fluctuations in the other
+component. We show that this p-wave superfluid gap induced by density
+fluctuations is greatly enhanced due to the Rashba-type spin-orbit coupling.",1409.1955v1
+2015-03-27,Polaron states in a CuO chain,"We introduce a one-dimensional model for a CuO chain, with holes and $S=1/2$
+spins localized in $3d_{x^2-y^2}$ orbitals, and $p_\sigma$ oxygen orbitals
+without holes in the ground state. We consider a single hole doped at an oxygen
+site and study its propagation by spin-flip processes. We develop the Green's
+function method and treat the hole-spin coupling in the self-consistent Born
+approximation, similar to that successfully used to study polarons in the
+regular $t$-$J$ model. We present an analytical solution of the problem and
+investigate whether the numerical integration is a good approximation to this
+solution.",1503.08201v1
+2012-04-12,Spin-orbit coupled cold exciton condensates,"We analyze theoretically the dynamics of degenerate condensate of cold
+indirect excitons. We account for both linear spin dependent terms arising from
+spin-orbit interaction of Rashba and Dresselhaus types and non-linear terms
+transforming a pair of bright excitons into a pair of dark ones. We show that
+both terms should lead to the qualitative changes in the dynamics of cold
+exciton droplets in the real space and time.",1204.2721v1
+2012-04-12,Magnetoelectric effect due to local noncentrosymmetry,"Magnetoelectrics often possess ions located in noncentrosymmetric
+surroundings. Based on this fact we suggest a microscopic model of
+magnetoelectric interaction and show that the spin-orbit coupling leads to
+spin-dependent electric dipole moments of the electron orbitals of these ions,
+which results in non-vanishing polarization for certain spin configurations.
+The approach accounts for the macroscopic symmetry of the unit cell and is
+valid both for commensurate and complex incommensurate magnetic structures. The
+model is illustrated by the examples of MnWO4, MnPS3 and LiNiPO4. Application
+to other magnetoelectrics is discussed.",1204.2771v1
+2017-07-11,Yu-Shiba-Rusinov states of impurities in a triangular lattice of NbSe$_{2}$ with spin orbit coupling,"We study topography of the spin-polarized bound states of magnetic impurities
+embedded in triangular lattice of a superconducting host. Such states have been
+observed experimentally in 2H-NbSe$_{2}$ crystal [G. C. M'enard et al.,
+Nat.Phys. 11, 1013 (2015)] and revealed the oscillating particle-hole asymmetry
+extending to tens of nanometers. Using the Bogoliubov-de Gennes approach we
+explore the Yu-Shiba-Rusinov states in presence of spin-orbit interaction. We
+also study the bound states of double impurities for several relative positions
+in a triangular lattice.",1707.03257v2
+2017-12-30,"Electronic, magnetic and ferroelectric properties of rhombohedral AgFeO2: an ab initio study","Using first principle calculations under the framework of density functional
+theory we have investigated the electronic structure, magnetism and
+ferroelectric polarization in the triangular lattice antiferromagnet AgFeO2,
+and its comparison to the isostructural system CuFeO2. Our calculations reveal
+that spin orbit interaction plays an important role in determining the magnetic
+property of AgFeO2 and is possibly responsible for its different magnetic
+ground state in comparison to CuFeO2. Calculations of ferroelectric
+polarization of AgFeO2 suggest that the spontaneous polarization arises from
+noncollinear spin arrangement via spin-orbit coupling. Our calculations also
+indicate that in addition to electronic contribution, the lattice mediated
+contribution to the polarization are also important for AgFeO2.",1801.00093v1
+2019-07-05,Topological states,"Topological phases are characterised by a topological invariant that remains
+unchanged by deformations in the Hamiltonian. Materials exhibiting topological
+phases include topological insulators, superconductors exhibiting strong
+spin-orbit coupling, transition metal dichalcogenides, which can be made
+atomically thin and have direct band gaps, as well as high mobility Weyl and
+Dirac semimetals. Devices harnessing topological electron states include
+topological (spin) transistors, spin-orbit torque devices, non-linear
+electrical and optical systems, and topological quantum bits.",1907.02625v1
+2012-05-25,Emergence of a common energy scale close to the orbital-selective Mott transition,"We calculate the spectra and spin susceptibilities of a Hubbard model with
+two bands having different bandwidths but the same on-site interaction, with
+parameters close to the orbital-selective Mott transition, using dynamical
+mean-field theory. If the Hund's rule coupling is sufficiently strong, one
+common energy scale emerges which characterizes both the location of kinks in
+the self-energy and extrema of the diagonal spin susceptibilities. A physical
+explanation of this energy scale is derived from a Kondo-type model. We infer
+that for multi-band systems local spin dynamics rather than spectral functions
+determine the location of kinks in the effective band structure.",1205.5782v1
+2019-01-17,Secular evolution of compact binaries revolving around a spinning massive black hole,"The leading order effect of the spin of a distant supermassive black hole
+(SMBH) on the orbit of compact binary revolving around it appears at the 1.5
+post Newtonian (PN) expansion through coupling with the inner and outer orbital
+angular momenta, and makes an oscillating characteristic contribution to the
+secular evolution of the compact binary eccentricity over a long time scale
+compared to the Kozai-Lidov dynamics caused by a non-spinning SMBH.",1901.05591v1
+2020-10-24,Large spin Hall effect in 5d-transition metal anti-perovskites,"The spin Hall effect (SHE) is highly promising for spintronic applications,
+and the design of materials with large SHE can enable ultra-low power memory
+technology. Recently, 5d-transition metal oxides have been shown to demonstrate
+a large SHE. Here we report large values of SHE in four 5d-transition metal
+anti-perovskites which makes these anti-perovskites promising spintronic
+materials. We demonstrate that these effects originate in the mixing of dx2-y2
+and dxy orbitals caused by spin orbit coupling.",2010.12942v1
+2023-10-10,Emerging Spin-Orbit Torques in Low Dimensional Dirac Materials,"We report a theoretical description of novel spin-orbit torque components
+emerging in two-dimensional Dirac materials with broken inversion symmetry. In
+contrast to usual metallic interfaces where field-like and damping-like torque
+components are competing, we find that an intrinsic damping-like torque which
+derives from all Fermi-sea electrons can be simultaneously enhanced along with
+the field-like component. Additionally, hitherto overlooked torque components
+unique to Dirac materials, emerge from the coupling between spin and pseudospin
+degrees of freedom. These torques are found to be resilient to disorder and
+could enhance the magnetic switching performance of nearby magnets.",2310.06447v1
+2019-11-08,Phase-separation of vector solitons in spin-orbit coupled spin-1 condensates,"We study the phase-separation in three-component bright vector solitons in a
+quasi-one-dimensional spin-orbit-coupled hyper-fine spin $F=1$ ferromagnetic
+Bose-Einstein condensate upon an increase of the strength of spin-orbit (SO)
+coupling $p_x \Sigma_z$ above a critical value, where $p_x$ is the linear
+momentum and $\Sigma_z$ is the $z$-component of the spin-1 matrix. The bright
+vector solitons are demonstrated to be mobile and dynamically stable. The
+collision between two such vector solitons is found to be elastic at all
+velocities with the conservation of density of each vector soliton. The two
+colliding vector solitons repel at small separation and at very small colliding
+velocity, they come close and bounce back with the same velocity without ever
+encountering each other. This repulsion produced by SO coupling is responsible
+for the phase separation in a vector soliton for large strengths of SO
+coupling. { The collision dynamics is found to be completely insensitive to the
+relative phase of the colliding solitons.} However, in the absence of SO
+coupling, at very small velocity, the two colliding vector solitons attract
+each other and form a vector soliton molecule and the collision dynamics is
+sensitive to the relative phase as in scalar solitons. The present
+investigation is carried out through a numerical solution and an analytic
+variational approximation of the underlying mean-field Gross-Pitaevskii
+equation.",1911.03498v1
+2023-04-22,Phase biasing of a Josephson junction using Rashba-Edelstein effect,"Manifestation of orbital coupling of spin degree of freedom in condensed
+matter systems has opened up a new dimension for the field of spintronics. The
+most appealing aspect of the spin-orbit coupling is the apparent Magnus force
+sensed by a spin system which locks the Fermi momentum with electron spin in a
+fascinating manner. In the current carrying state, the resulting macroscopic
+spin polarization becomes directly accessible in the form of spin current or
+spin density. At a Rashba interface, for example, a charge current shifts the
+spin-locked Fermi surface, leading to a non-equilibrium spin density at the
+interface, commonly known as the Rashba-Edelstein effect. Since the
+Rashba-Edelstein effect is an intrinsically interface property, direct
+detection of the spin moment is harder to set-up. Here we demonstrate that a
+simple planar Josephson Junction geometry, realized by placing two closely
+spaced superconducting electrodes on such a Rashba interface, allows a direct
+estimation of strength of the non-equilibrium spin moment. Measurements of
+Fraunhofer patterns of Nb-(Pt/Cu)-Nb planar Josephson junctions in a
+perpendicular magnetic field showed a shift of the center of the Fraunhofer
+pattern to a non-zero field value. By performing extensive control
+measurements, we argue that the screening currents in the junction effectively
+lock the external field with the spin moment of the Rashba-Edelstein effect
+induced spin-density, leading to the observed shift in the Fraunhofer patterns.
+This simple experiment offers a fresh perspective on direct detection of spin
+polarization induced by various spin-orbit effects. Very interestingly, this
+device platform also offers the possibility of retaining a controllable phase
+at zero field in the junction without using any magnetic material, and thereby
+useful as phase batteries for superconducting quantum circuits.",2304.11457v2
+2006-07-05,Effect of Hund's rule coupling on SU(4) spin-orbital system,"We investigate the ground-state property of a one-dimensional two-orbital
+Hubbard model at quarter filling by numerical techniques such as the
+density-matrix renormalization group method and the exact diagonalization. When
+the Hund's rule coupling $J$ is zero, the model is SU(4) symmetric. In fact,
+both spin and orbital correlations have a peak at $q=\pi/2$, indicating an
+SU(4) singlet state with a four-site periodicity. On the other hand, with
+increasing $J$, it is found that the peak position of the orbital correlation
+changes to $q=\pi$, while that of the spin correlation remains at $q=\pi/2$. We
+briefly discuss how the SU(4) symmetry is broken by $J$.",0607104v1
+2011-02-15,Magnetic Field Probing of an SU(4) Kondo Resonance in a Single Atom Transistor,"Semiconductor nano-devices have been scaled to the level that transport can
+be dominated by a single dopant atom. In the strong coupling case a Kondo
+effect is observed when one electron is bound to the atom. Here, we report on
+the spin as well as orbital Kondo ground state. We experimentally as well than
+theoretically show how we can tune a symmetry transition from a SU(4) ground
+state, a many body state that forms a spin as well as orbital singlet by
+virtual exchange with the leads, to a pure SU(2) orbital ground state, as a
+function of magnetic field. The small size and the s-like orbital symmetry of
+the ground state of the dopant, make it a model system in which the magnetic
+field only couples to the spin degree of freedom and allows for observation of
+this SU(4) to SU(2) transition.",1102.2977v2
+2013-05-08,"Nematic State of the Pnictides Stabilized by the Interplay Between Spin, Orbital, and Lattice Degrees of Freedom","The nematic state of the iron-based superconductors is studied in the undoped
+limit of the three-orbital ($xz$, $yz$, $xy$) spin-fermion model via the
+introduction of lattice degrees of freedom. Monte Carlo simulations show that
+in order to stabilize the experimentally observed lattice distortion and
+nematic order, and to reproduce photoemission experiments, {\it both} the
+spin-lattice and orbital-lattice couplings are needed. The interplay between
+their respective coupling strengths regulates the separation between the
+structural and N\'eel transition temperatures. Experimental results for the
+temperature dependence of the resistivity anisotropy and the angle-resolved
+photoemission (ARPES) orbital spectral weight are reproduced by the present
+numerical simulations.",1305.1879v1
+2015-05-19,Pair breaking in multi-orbital superconductors: an application to oxide interfaces,"We investigate the impact of impurity scattering on superconductivity in an
+anisotropic multi-orbital model with spin-orbit coupling which describes the
+electron fluid at two-dimensional oxide interfaces. As the pairing mechanism is
+under debate, both conventional and unconventional superconducting states are
+analyzed. We consider magnetic and nonmagnetic spin-dependent intra- and
+interorbital scattering and discuss possible microscopic realizations leading
+to these processes. It is found that, for magnetic disorder, the unconventional
+superconductor is protected against interband scattering and, thus, more robust
+than the conventional condensate. In case of nonmagnetic impurities, the
+conventional superconductor is protected as expected from the Anderson theorem
+and the critical scattering rate of the unconventional state is enhanced by a
+factor of four due to the spin-orbit coupling and anisotropic masses in oxide
+interfaces.",1505.04919v1
+2017-02-03,Geometric influences of a particle confined to a curved surface embedded in three-dimensional Euclidean space,"In the spirit of the thin-layer quantization approach, we give the formula of
+the geometric influences of a particle confined to a curved surface embedded in
+three-dimensional Euclidean space. The geometric contributions can result from
+the reduced commutation relation between the acted function depending on normal
+variable and the normal derivative. According to the formula, we obtain the
+geometric potential, geometric momentum, geometric orbital angular momentum,
+geometric linear Rashba and cubic Dresselhaus spin-orbit couplings. As an
+example, a truncated cone surface is considered. We find that the geometric
+orbital angular momentum can provide an azimuthal polarization for spin, and
+the sign of the geometric Dresselhaus spin-orbit coupling can be flipped
+through the inclination angle of generatrix.",1702.00893v2
+2019-06-20,"Crystal structure and the magnetic properties of the 5d transition metal oxide AOsO4 (A = K, Rb, Cs)","We synthesized the 5d1-transition metal oxides AOsO4 (A = K, Rb, Cs) by
+solid-state reaction, and performed structure determination and magnetic and
+heat capacity measurements. It was found that they crystallize in a scheelite
+(A = K and Rb) or a quasi-scheelite structure (A = Cs) comprising of distorted
+diamond lattices of septivalent Os (d1) ions tetrahedrally coordinated by four
+oxide ions without local inversion symmetry; hence an antisymmetric spin-orbit
+coupling is expected in the crystals. The K and Rb compounds have Weiss
+temperatures of theta = -66 and -18 K, effective magnetic moments of mu_eff =
+1.44 and 1.45 mu_B/Os, and antiferromagnetic transition temperatures of T_N =
+36.9 and 21.0 K, respectively. In contrast, the Cs compound has theta = 12 K
+and mu_eff = 0.8 mu_B/Os without magnetic transition above 2 K, instead
+exhibiting a first-order structural transition at T_s = 152.5 K. The decline of
+the Os moment from 1.73 mu_B/Os for the simple d1 spin, particularly for Cs, is
+likely to originate from the antiparallel orbital moment, although the
+spin-orbit coupling is generally quenched in the low-lying e orbitals.",1906.08519v1
+2020-01-24,Anisotropic magnetoresistance in spin-orbit semimetal SrIrO3,"SrIrO3, the three-dimensional member of the Ruddlesden-Popper iridates, is a
+paramagnetic semimetal characterised by a the delicate interplay between
+spin-orbit coupling and Coulomb repulsion. In this work, we study the
+anisotropic magnetoresistance (AMR) of SrIrO3 thin films, which is closely
+linked to spin-orbit coupling and probes correlations between electronic
+transport, magnetic order and orbital states. We show that the low-temperature
+negative magnetoresistance is anisotropic with respect to the magnetic field
+orientation, and its angular dependence reveals the appearance of a fourfold
+symmetric component above a critical magnetic field. We show that this AMR
+component is of magnetocrystalline origin, and attribute the observed
+transition to a field-induced magnetic state in SrIrO3.",2001.08939v1
+2018-06-19,Rolling Skyrmions and the Nuclear Spin-Orbit Force,"We compute the nuclear spin-orbit coupling from the Skyrme model. Previous
+attempts to do this were based on the product ansatz, and as such were limited
+to a system of two well-separated nuclei. Our calculation utilises a new
+method, and is applicable to the phenomenologically important situation of a
+single nucleon orbiting a large nucleus. We find that, to second order in
+perturbation theory, the coefficient of the spin-orbit coupling induced by pion
+field interactions has the wrong sign, but as the strength of the pion-nucleon
+interactions increases the correct sign is recovered non-perturbatively.",1806.07330v2
+2021-03-09,Tree tensor-network real-time multiorbital impurity solver: Spin-orbit coupling and correlation functions in Sr$_2$RuO$_4$,"We present a tree tensor-network impurity solver suited for general
+multiorbital systems. The network is constructed to efficiently capture the
+entanglement structure and symmetry of an impurity problem. The solver works
+directly on the real-time/frequency axis and generates spectral functions with
+energy-independent resolution of the order of one percent of the correlated
+bandwidth. Combined with an optimized representation of the impurity bath, it
+efficiently solves self-consistent dynamical mean-field equations and
+calculates various dynamical correlation functions for systems with
+off-diagonal Green's functions. For the archetypal correlated Hund's metal
+Sr$_2$RuO$_4$, we show that both the low-energy quasiparticle spectra related
+to the van Hove singularity and the high-energy atomic multiplet excitations
+can be faithfully resolved. In particular, we show that while the spin-orbit
+coupling has only minor effects on the orbital-diagonal one-particle spectral
+functions, it has a more profound impact on the low-energy spin and orbital
+response functions.",2103.05545v2
+2021-08-13,Twist-angle dependent proximity induced spin-orbit coupling in graphene/transition-metal dichalcogenide heterostructures,"We investigate the proximity-induced spin-orbit coupling in heterostructures
+of twisted graphene and monolayers of transition-metal dichalcogenides (TMDCs)
+MoS$_2$, WS$_2$, MoSe$_2$, and WSe$_2$ from first principles. We identify
+strain, which is necessary to define commensurate supercells, as the key factor
+affecting the band offsets and thus magnitudes of the proximity couplings. We
+establish that for biaxially strained graphene the band offsets between the
+Dirac point and conduction (valence) TMDC bands vary linearly with strain,
+regardless of the twist angle. This relation allows to identify the apparent
+zero-strain band offsets and find a compensating transverse electric field
+correcting for the strain. The resulting corrected band structure is then
+fitted around the Dirac point to an established spin-orbit Hamiltonian. This
+procedure yields the dominant, valley-Zeeman and Rashba spin-orbit couplings.
+The magnitudes of these couplings do not vary much with the twist angle,
+although the valley-Zeeman coupling vanishes for 30$^{\circ}$ and Mo-based
+heterostructures exhibit a maximum of the coupling at around 20$^{\circ}$. The
+maximum for W-based stacks is at 0$^{\circ}$. The Rashba coupling is in general
+weaker than the valley-Zeeman coupling, except at angles close to 30$^{\circ}$.
+We also identify the Rashba phase angle which measures the deviation of the
+in-plane spin texture from tangential, and find that this angle is very
+sensitive to the applied transverse electric field. We further discuss the
+reliability of the supercell approach with respect to atomic relaxation
+(rippling of graphene), relative lateral shifts of the atomic layers, and
+transverse electric field.",2108.06126v3
+2017-03-03,Spin orbit coupling and Lorentz force enhanced efficiency of TiO2 based dye sensitized solar cells,"We report on the effect of the strong spin orbit coupling and the Lorentz
+force on the efficiency of TiO2 based dye sensitized solar cells. Upon
+inclusion of Ho2O3, due to the strong spin orbit coupling of the rare earth
+Ho3+ ion, we do see 13 percent enhancement in the efficiency. We attribute such
+an enhancement in power conversion efficiency to the increased lifetime of the
+photo-excited excitons. Essentially, a Ho3+ ion accelerates the phenomenon of
+the spin rephasing or the intersystem crossing of the excitons in a
+photosensitizer. Increase in the absorbance and decrease in the
+photoluminescence intensity suggests a decrease in the recombination rate,
+hinting an enhanced charge transport and is in accordance with our
+electrochemical impedance spectra and the J V characteristics. From the above
+we strongly believe that enhanced efficiency of the device is due to increased
+intersystem crossing which would accelerate the exciton dissociation. On top of
+spin orbit interaction, a configuration where the electric and magnetic fields
+are perpendicular to each other helped in enhancing the efficiency by 16
+percent, suggesting that the Lorentz force also plays a dominant role in
+controlling the charge transport of the photo-generated charge carriers. We
+strongly believe that this simple and novel strategy of improving the
+efficiency may pave the way for realizing higher efficiency dye sensitized
+solar cells.",1703.01099v1
+2020-09-08,Spin-Orbit Torques in Transition Metal Dichalcogenide/Ferromagnet Heterostructures,"In recent years, there has been a growing interest in spin-orbit torques
+(SOTs) for manipulating the magnetization in nonvolatile magnetic memory
+devices. SOTs rely on the spin-orbit coupling of a nonmagnetic material coupled
+to a ferromagnetic layer to convert an applied charge current into a torque on
+the magnetization of the ferromagnet (FM). Transition metal dichalcogenides
+(TMDs) are promising candidates for generating these torques with both high
+charge-to-spin conversion ratios, and symmetries and directions which are
+efficient for magnetization manipulation. Moreover, TMDs offer a wide range of
+attractive properties, such as large spin-orbit coupling, high crystalline
+quality and diverse crystalline symmetries. Although numerous studies were
+published on SOTs using TMD/FM heterostructures, we lack clear understanding of
+the observed SOT symmetries, directions, and strengths. In order to shine some
+light on the differences and similarities among the works in literature, in
+this mini-review we compare the results for various TMD/FM devices,
+highlighting the experimental techniques used to fabricate the devices and to
+quantify the SOTs, discussing their potential effect on the interface quality
+and resulting SOTs. This enables us to both identify the impact of particular
+fabrication steps on the observed SOT symmetries and directions, and give
+suggestions for their underlying microscopic mechanisms. Furthermore, we
+highlight recent progress of the theoretical work on SOTs using TMD
+heterostructures and propose future research directions.",2009.03710v2
+2020-09-18,Shadowed triplet pairings in Hund's metals with spin-orbit coupling,"Hund's coupling in multiorbital systems allows for the possibility of
+even-parity orbital-antisymmetric spin-triplet pairing, which can be stabilized
+by spin-orbit coupling (SOC). While this pairing expressed in the orbital basis
+is uniform and spin-triplet, it appears in the band basis as a
+pseudospin-singlet, with the momentum dependence determined by the SOC and the
+underlying triplet character remaining in the form of interband pairing active
+away from the Fermi energy. Here, we examine the role of momentum-dependent SOC
+in generating nontrivial pairing symmetries, as well as the hidden triplet
+nature associated with this interorbital pairing, which we dub a ""shadowed
+triplet"". Applying this concept to Sr$_{2}$RuO$_{4}$, we first derive several
+forms of SOC with $d$-wave form factors from a microscopic model, and
+subsequently we show that for a range of SOC parameters, a pairing state with
+$s+id_{xy}$ symmetry can be stabilized. Such a pairing state is distinct from
+pure spin-singlet and -triplet pairings due to its unique character of
+pseudospin-energy locking. We discuss experimental probes to differentiate the
+shadowed triplet pairing from conventional pseudospin-triplet and -singlet
+pairings.",2009.08597v2
+2022-04-29,Anomalous Josephson Coupling and High-Harmonics in Non-Centrosymmetric Superconductors with $S$-wave Spin-Triplet Pairing,"We study the Josephson effects arising in junctions made of
+non-centrosymmetric superconductors with spin-triplet pairing having $s$-wave
+orbital-singlet symmetry. We demonstrate that the orbital dependent character
+of the spin-triplet order parameter determines its non-trivial texture in the
+momentum space due to the inversion symmetry breaking and spin-orbit
+interactions. The emergence of this pattern is responsible for the occurrence
+of an anomalous Josephson coupling and a dominance of high-harmonics in the
+current phase relation. Remarkably, due to the spin-orbital couplings,
+variations in the electronic structure across the heterostructure can generally
+turn the ground state of the junction from 0- to a generic value of the
+Josephson phase, thus realizing the so-called $\varphi$-junction. Hallmarks of
+the resulting Josephson behavior, apart from non-standard current-phase
+relation, are provided by an unconventional temperature and magnetic field
+dependence of the critical current. These findings indicate the path for the
+design of superconducting orbitronics devices and account for several observed
+anomalies of the supercurrent in oxide interface superconductors.",2204.14083v2
+2021-01-23,Experimental demonstration of cylindrical vector spatiotemporal optical vortex,"We experimentally generate cylindrically polarized wavepackets with
+transverse orbital angular momentum, demonstrating the coexistence of
+spatiotemporal optical vortex with spatial polarization singularity. The
+results in this paper extend the study of spatiotemporal wavepackets to a
+broader scope, paving the way for its applications in various areas such as
+light-matter interaction, optical tweezers, spatiotemporal spin-orbit angular
+momentum coupling, etc.",2101.09452v1
+2004-05-13,Modulating Unpolarized Current in Quantum Spintronics: Visibility of Spin-Interference Effects in Multichannel Aharonov-Casher Mesoscopic Rings,"The conventional unpolarized current injected into a {\em quantum-coherent}
+semiconductor ring attached to two external leads can be modulated from perfect
+conductor to perfect insulator limit via Rashba spin-orbit (SO) coupling. This
+requires that ballistic propagation of electrons, whose spin precession is
+induced by the Aharonov-Casher phase, takes place through a single conducting
+channel ensuring that electronic quantum state remains a pure separable one in
+the course of transport. We study the fate of such spin interference effects as
+more than one orbital conducting channel becomes available for quantum
+transport. Although the conductance of multichannel rings, in general, does not
+go all the way to zero at any value of the SO coupling, some degree of current
+modulation survives. We analyze possible scenarios that can lead to reduced
+visibility of spin interference effects that are responsible for the zero
+conductance at particular values of the Rashba interaction: (i) the transmitted
+spin states remain fully coherent, but conditions for destructive interference
+are different in different channels; (ii) the transmitted spins end up in
+partially coherent quantum state arising from entanglement to the environment
+composed of orbital degrees of freedom of the same particle to which the spin
+is attached.",0405300v1
+2012-12-03,Spin polarization via decoherence in spin-orbit active media coupled to an electron reservoir,"We study the spin polarization of mixed and entangled electron states in a
+four probe/beam splitter geometry with local Rashba and Dresselhaus
+interactions. A pair of maximally entangled electrons collides with the beam
+splitter and enters into two perpendicular branches of length L, composed of
+spin-orbit active materials (gate confined 2D electron gas). One of the
+branches is connected to an electron reservoir that acts as a source of
+decoherence by either behaving as a voltage probe or as a controlled source or
+sink of current at fixed voltage. Such decoherence source is used to modify the
+entropy of an unpolarized incoming state in order to generate electron
+polarization at one or both output branches. The degree of entanglement of the
+global state and the spin polarization is computed for the outgoing electrons
+as a function of the coupling to the electron reservoir. Experimentally
+available spin-orbit strength at the beam splitter arms, for arm lengths of a
+few micrometers, is able to modulate spin polarization up to 80% in particular
+spin axes proportional to the decoherence current. The Dresselhaus and Rashba
+coefficients play a symmetric role in modulating the polarization.
+Significantly less polarization is achieved for incoming mixed states due to
+the local operation of the reservoir.",1212.0497v1
+2013-10-29,"Spin-orbit coupling, quantum dots, and qubits in monolayer transition metal dichalcogenides","We derive an effective Hamiltonian which describes the dynamics of electrons
+in the conduction band of transition metal dichalcogenides (TMDC) in the
+presence of perpendicular electric and magnetic fields. We discuss in detail
+both the intrinsic and the Bychkov-Rashba spin-orbit coupling (SOC) induced by
+an external electric field.
+  We point out interesting differences in the spin-split conduction band
+between different TMDC compounds. An important consequence of the strong
+intrinsic SOC is an effective out-of-plane $g$-factor for the electrons which
+differs from the free-electron g-factor $g\simeq 2$. We identify a new term in
+the Hamiltonian of the Bychkov-Rashba SOC which does not exist in III-V
+semiconductors. Using first-principles calculations, we give estimates of the
+various parameters appearing in the theory.
+  Finally, we consider quantum dots (QDs) formed in TMDC materials and derive
+an effective Hamiltonian which allows us to calculate the magnetic field
+dependence of the bound states in the QDs. We find that all states are both
+valley and spin split, which suggests that these QDs could be used as
+valley-spin filters.
+  We explore the possibility of using spin and valley states in TMDCs as
+quantum bits, and conclude that, due to the relatively strong intrinsic
+spin-orbit splitting in the conduction band, the most realistic option appears
+to be a combined spin-valley (Kramers) qubit at low magnetic fields.",1310.7720v3
+2021-04-26,Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi,"A chiral compound FeSi is a nonmagnetic narrow-gap insulator, exhibiting
+peculiar charge and spin dynamics beyond a simple band-structure picture. Those
+unusual features have been attracting renewed attention from topological
+aspects. Although a signature of surface conduction was indicated according to
+size-dependent resistivity in bulk crystals, its existence and topological
+properties remain elusive. Here we demonstrate an inherent surface
+ferromagnetic-metal state of FeSi thin films and its strong spin-orbit-coupling
+(SOC) properties through multiple characterizations of the two-dimensional (2D)
+conductance, magnetization and spintronic functionality. Terminated
+covalent-bonding orbitals constitute the polar surface state with
+momentum-dependent spin textures due to Rashba-type spin splitting, as
+corroborated by unidirectional magnetoresistance measurements and
+first-principles calculations. As a consequence of the spin-momentum locking,
+non-equilibrium spin accumulation causes magnetization switching. These surface
+properties are closely related to the Zak phase of the bulk band topology. Our
+findings propose another route to explore noble-metal-free materials for
+SOC-based spin manipulation.",2104.12438v1
+2022-04-21,Spin-momentum locking from topological quantum chemistry: applications to multifold fermions,"In spin-orbit coupled crystals, symmetries can protect multifold degeneracies
+with large Chern numbers and Brillouin zone spanning topological surface
+states. In this work, we explore the extent to which the nontrivial topology of
+chiral multifold fermions impacts the spin texture of bulk states. To do so, we
+formulate a definition of spin-momentum locking in terms of reduced density
+matrices. Using tools from the theory of topological quantum chemistry, we show
+how the reduced density matrix can be determined from the knowledge of the
+basis orbitals and band representation forming the multifold fermion. We show
+how on-site spin orbit coupling, crystal field splitting, and Wyckoff position
+multiplicity compete to determine the spin texture of states near chiral
+fermions. We compute the spin texture of multifold fermions in several
+representative examples from space groups $P432$ (207) and $P2_13$ (198). We
+show that the winding number of the spin around the Fermi surface can take many
+different integer values, from zero all the way to $\pm 7$. Finally, we
+conclude by showing how to apply our theory to real materials using the example
+of PtGa in space group $P2_13$.",2204.10113v1
+2010-06-21,Next-to-leading order gravitational spin-orbit coupling in an effective field theory approach,"We use an effective field theory (EFT) approach to calculate the next to
+leading order (NLO) gravitational spin-orbit interaction between two spinning
+compact objects. The NLO spin-orbit interaction provides the most
+computationally complex sector of the NLO spin effects, previously derived
+within the EFT approach. In particular, it requires the inclusion of
+non-stationary cubic self-gravitational interaction, as well as the
+implementation of a spin supplementary condition (SSC) at higher orders. The
+EFT calculation is carried out in terms of the non-relativistic gravitational
+field parametrization, making the calculation more efficient with no need to
+rely on automated computations, and illustrating the coupling hierarchy of the
+different gravitational field components to the spin and mass sources. Finally,
+we show explicitly how to relate the EFT derived spin results to the canonical
+results obtained with the ADM Hamiltonian formalism. This is done using
+non-canonical transformations, required due to the implementation of covariant
+SSC, as well as canonical transformations at the level of the Hamiltonian, with
+no need to resort to the equations of motion or the Dirac brackets.",1006.4139v3
+2011-01-20,Theory of Single Electron Spin Relaxation in Si/SiGe Lateral Coupled Quantum Dots,"We investigate the spin relaxation induced by acoustic phonons in the
+presence of spin-orbit interactions in single electron Si/SiGe lateral coupled
+quantum dots. The relaxation rates are computed numerically in single and
+double quantum dots, in in-plane and perpendicular magnetic fields. The
+deformation potential of acoustic phonons is taken into account for both
+transverse and longitudinal polarizations and their contributions to the total
+relaxation rate are discussed with respect to the dilatation and shear
+potential constants. We find that in single dots the spin relaxation rate
+scales approximately with the seventh power of the magnetic field, in line with
+a recent experiment. In double dots the relaxation rate is much more sensitive
+to the dot spectrum structure, as it is often dominated by a spin hot spot. The
+anisotropy of the spin-orbit interactions gives rise to easy passages, special
+directions of the magnetic field for which the relaxation is strongly
+suppressed. Quantitatively, the spin relaxation rates in Si are typically 2
+orders of magnitude smaller than in GaAs due to the absence of the
+piezoelectric phonon potential and generally weaker spin-orbit interactions.",1101.3858v3
+2011-03-30,Spin and charge transport in U-shaped one-dimensional channels with spin-orbit couplings,"A general form of the Hamiltonian for electrons confined to a curved
+one-dimensional (1D) channel with spin-orbit coupling (SOC) linear in momentum
+is rederived and is applied to a U-shaped channel. Discretizing the derived
+continuous 1D Hamiltonian to a tight-binding version, the Landauer-Keldysh
+formalism (LKF) for nonequilibrium transport can be applied. Spin transport
+through the U-channel based on the LKF is compared with previous quantum
+mechanical approaches. The role of a curvature-induced geometric potential
+which was previously neglected in the literature of the ring issue is also
+revisited. Transport regimes between nonadiabatic, corresponding to weak SOC or
+sharp turn, and adiabatic, corresponding to strong SOC or smooth turn, is
+discussed. Based on the LKF, interesting charge and spin transport properties
+are further revealed. For the charge transport, the interplay between the
+Rashba and the linear Dresselhaus (001) SOCs leads to an additional modulation
+to the local charge density in the half-ring part of the U-channel, which is
+shown to originate from the angle-dependent spin-orbit potential. For the spin
+transport, theoretically predicted eigenstates of the Rashba rings, Dresselhaus
+rings, and the persistent spin-helix state are numerically tested by the
+present quantum transport calculation.",1103.5926v3
+2020-12-23,Nagaoka spin-valley ordering in silicene quantum dots,"We study a cluster of quantum dots defined within silicene that host confined
+electron states with spin and valley degrees of freedom. Atomistic
+tight-binding and continuum Dirac approximation are applied for few-electron
+system in quest for spontaneous valley polarization driven by inter-dot
+tunneling and electron-electron interaction, i.e. a valley counterpart of
+itinerary Nagaoka ferromagnetic ordering recently identified in GaAs square
+cluster of quantum dots with three excess electrons [P. Dehollain, {\it et
+al.}, Nature {\bf 579}, 528 (2020)]. We find that for Hamiltonian without
+intrinsic-spin orbit coupling -- similar to the one of graphene with staggered
+potential -- the valley polarization in the ground-state can be observed in a
+range of inter-dot spacing provided that the spin of the system is frozen by
+external magnetic field. The inter-valley scattering effects are negligible for
+cluster geometry that supports the valley polarized ground-state. In presence
+of a strong intrinsic spin-orbit coupling that is characteristic to graphene no
+external magnetic field is necessary for observation of ground-state that is
+polarized in both spin and valley. The effective magnetic field due to the
+spin-orbit interaction produces a perfect anticorrelation of the spin and
+valley isospin components in the degenerate ground-state.",2012.12524v2
+2007-07-17,Quarkonium and hydrogen spectra with spin dependent relativistic wave equation,"A non-linear non-perturbative relativistic atomic theory introduces spin in
+the dynamics of particle motion. The resulting energy levels of Hydrogen atom
+are exactly same as the Dirac theory. The theory accounts for the energy due to
+spin-orbit interaction and for the additional potential energy due to spin and
+spin-orbit coupling. Spin angular momentum operator is integrated into the
+equation of motion. This requires modification to classical Laplacian operator.
+Consequently the Dirac matrices and the k operator of Dirac's theory are
+dispensed with. The theory points out that the curvature of the orbit draws on
+certain amount of kinetic and potential energies affecting the momentum of
+electron and the spin-orbit interaction energy constitutes a part of this
+energy. The theory is developed for spin 1/2 bound state single electron in
+Coulomb potential and then further extended to quarkonium physics by
+introducing the linear confining potential. The unique feature of this
+quarkonium model is that the radial distance can be exactly determined and does
+not have a statistical interpretation. The established radial distance is then
+used to determine the wave function. The observed energy levels are used as the
+input parameters and the radial distance and the string tension are predicted.
+This ensures 100% conformance to all observed energy levels for the heavy
+quarkonium.",0707.2431v7
+2009-10-29,Dual black holes in merger remnants. II: spin evolution and gravitational recoil,"Using high resolution hydrodynamical simulations, we explore the spin
+evolution of massive dual black holes orbiting inside a circumnuclear disc,
+relic of a gas-rich galaxy merger. The black holes spiral inwards from
+initially eccentric co or counter-rotating coplanar orbits relative to the
+disc's rotation, and accrete gas that is carrying a net angular momentum. As
+the black hole mass grows, its spin changes in strength and direction due to
+its gravito-magnetic coupling with the small-scale accretion disc. We find that
+the black hole spins loose memory of their initial orientation, as accretion
+torques suffice to align the spins with the angular momentum of their orbit on
+a short timescale (<1-2 Myr). A residual off-set in the spin direction relative
+to the orbital angular momentum remains, at the level of <10 degrees for the
+case of a cold disc, and <30 degrees for a warmer disc. Alignment in a cooler
+disc is more effective due to the higher coherence of the accretion flow near
+each black hole that reflects the large-scale coherence of the disc's rotation.
+If the massive black holes coalesce preserving the spin directions set after
+formation of a Keplerian binary, the relic black hole resulting from their
+coalescence receives a relatively small gravitational recoil. The distribution
+of recoil velocities inferred from a simulated sample of massive black hole
+binaries has median <70 km/s much smaller than the median resulting from an
+isotropic distribution of spins.",0910.5729v2
+2013-01-14,Anomalous enhancement of Wilson ratio in a quantum spin liquid with strong spin-orbital entanglement: the case of Na4Ir3O8,"We present a theory for the metal-insulator transition (MIT) in the
+quantum-spin-liquid candidate material Na4Ir3O8. We consider an extended
+Hubbard model on the hyperkagome lattice, which incorporates atomic spin-orbit
+coupling (SOC) and multi-orbital interactions of iridium 5d electrons. This
+model is analyzed using the slave-rotor mean-field theory and thermodynamic
+properties across the MIT are studied. The ground state in the insulating side
+is a U(1) quantum spin liquid with spinon Fermi surfaces that consist of
+multiple particle-like and hole-like pockets. It is shown that the Wilson ratio
+in the quantum spin liquid phase is highly enhanced compared to the metallic
+state. This originates from the fact that the magnetic susceptibility in the
+quantum spin liquid phase acquires multiple enhancements due to the strong SOC,
+reduced band-width and on-site spin-orbital exchange, while the heat capacity
+does not change much across MIT. This explains the large Wilson ratio of the
+insulating phase observed in the previous experiment on Na4Ir3O8. Possible
+connections to other existing and future experiments, in particular on the
+metallic phase, are discussed.",1301.3107v2
+2019-06-18,Long-ranged triplet supercurrent in a single in-plane ferromagnet with spin-orbit coupled contacts to superconductors,"By converting conventional spin-singlet Cooper pairs to polarized
+spin-triplet pairs, it is possible to sustain long-ranged spin-polarized
+supercurrents flowing through strongly polarized ferromagnets. Obtaining such a
+conversion via spin-orbit interactions, rather than magnetic inhomogeneities,
+has recently been explored in the literature. A challenging aspect with regard
+to experimental detection has been that in order for Rashba spin-orbit
+interactions, present e.g. at interfaces due to inversion symmetry breaking, to
+generate such long-ranged supercurrents, an out-of-plane component of the
+magnetization is required. This limits the choice of materials and can induce
+vortices in the superconducting region complicating the interpretation of
+measurements. Therefore, it would be desirable to identify a way in which
+Rashba spin-orbit interactions can induce long-ranged supercurrents for purely
+in-plane rotations of the magnetization. Here, we show that this is possible in
+a lateral Josephson junction where two superconducting electrodes are placed in
+contact with a ferromagnetic film via two thin, heavy normal metals. The
+magnitude of the supercurrent in such a setup becomes tunable by the in-plane
+magnetization angle when using only a single magnetic layer. These results
+could provide a new and simpler way to generate controllable spin-polarized
+supercurrents than previous experiments which utilized complicated magnetically
+textured Josephson junctions.",1906.07725v2
+2019-11-25,"Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits","Strong spin-orbit interactions make hole quantum dots central to the quest
+for electrical spin qubit manipulation enabling fast, low-power, scalable
+quantum computation. Yet it is important to establish to what extent spin-orbit
+coupling exposes qubits to electrical noise, facilitating decoherence. Here,
+taking Ge as an example, we show that group IV gate-defined hole spin qubits
+generically exhibit optimal operation points, defined by the top gate electric
+field, at which they are both fast and long-lived: the dephasing rate vanishes
+to first order in electric field noise along all directions in space, the
+electron dipole spin resonance strength is maximised, while relaxation is
+drastically reduced at small magnetic fields. The existence of optimal
+operation points is traced to group IV crystal symmetry and properties of the
+Rashba spin-orbit interaction unique to spin-3/2 systems. Our results overturn
+the conventional wisdom that fast operation implies reduced lifetimes, and
+suggest group IV hole spin qubits as ideal platforms for ultra-fast, highly
+coherent scalable quantum computing.",1911.11143v2
+2020-03-16,Spin-orbit torques originating from bulk and interface in Pt-based structures,"We investigated spin-orbit torques in prototypical Pt-based spintronic
+devices. We found that, in Pt/Ni and Pt/Fe bilayers, the damping-like torque
+efficiency depends on the thickness of the Pt layer. We also found that the
+damping-like torque efficiency is almost identical in the Pt/Ni and Pt/Fe
+bilayers despite the stronger spin memory loss at the Pt/Fe interface. These
+results suggest that although the dominant source of the damping-like torque is
+the bulk spin Hall effect in the Pt layer, a sizable damping-like torque is
+generated by the interface in the Pt/Fe bilayer due to the stronger interfacial
+spin-orbit coupling. In contrast to the damping-like torque, whose magnitude
+and sign are almost identical in the Pt/Ni and Pt/Fe bilayers, the field-like
+torque strongly depends on the choice of the ferromagnetic layer. The sign of
+the field-like torque originating from the bulk spin Hall effect in the Pt
+layer is opposite between the Pt/Ni and Pt/Fe bilayers, which can be attributed
+to the opposite sign of the imaginary part of the spin-mixing conductance.
+These results demonstrate that the spin-orbit torques are quite sensitive to
+the electronic structure of the FM layer.",2003.07271v2
+2022-10-21,Calculation of molecular g-tensors by sampling spin orientations of generalised Hartree-Fock states,"The variational inclusion of spin-orbit coupling in self-consistent field
+(SCF) calculations requires a generalised two-component framework, which
+permits the single-determinant wave function to completely break spin symmetry.
+The individual components of the molecular g-tensor are commonly obtained from
+separate SCF solutions that align the magnetic moment along one of the three
+principal tensor axes. However, this strategy raises the question if energy
+differences between solutions are relevant, or how convergence is achieved if
+the principal axis system is not determined by molecular symmetry. The present
+work resolves these issues by a simple two-step procedure akin to the generator
+coordinate method (GCM). First, a few generalised Hartree Fock (GHF) solutions
+are converged, applying, where needed, a constraint to the orientation of the
+magnetic-moment or spin vector. Then, superpositions of GHF determinants are
+formed through non-orthogonal configuration interaction. This procedure yields
+a Kramers doublet for the calculation of the complete g-tensor. Alternatively,
+for systems with weak spin-orbit effects, diagonalisation in a basis spanned by
+spin rotations of a single GHF determinant affords qualitatively correct
+g-tensors by eliminating errors related to spin contamination. For small
+first-row molecules, these approaches are evaluated against experimental data
+and full configuration interaction results. It is further demonstrated for two
+systems (a fictitious tetrahedral CH4+ species, and a CuF4(2-) complex) that a
+GCM strategy, in contrast to alternative mean-field methods, can correctly
+describe the spin-orbit splitting of orbitally-degenerate ground states, which
+causes large g-shifts and may lead to negative g-values.",2210.12009v1
+2007-07-31,Photon-assisted spin transport in a two-dimensional electron gas,"We study spin-dependent transport in a two-dimensional electron gas subject
+to an external step-like potential $V(x)$ and irradiated by an electromagnetic
+field (EF). In the absence of EF the electronic spectrum splits into spin
+sub-bands originating from the ""Rashba"" spin-orbit coupling. We show that the
+resonant interaction of propagating electrons with the component EF parallel to
+the barrier induces a \textit{% non-equilibrium dynamic gap} $(2\Delta_{R})$
+between the spin sub-bands. Existence of this gap results in coherent spin-flip
+processes that lead to a spin-polarized current and a large magnetoresistance,
+i.e the spin valve effect. These effects may be used for controlling spin
+transport in semiconducting nanostructures, e.g. spin transistors,
+spin-blockade devices etc., by variation of the intensity S and frequency
+$\omega $ of the external radiation.",0707.4571v2
+2008-12-18,Mesoscopic Spin-Hall Effect in 2D electron systems with smooth boundaries,"Spin-Hall effect in ballistic 2D electron gas with Rashba-type spin-orbit
+coupling and smooth edge confinement is studied. We predict that the interplay
+of semiclassical electron motion and quantum dynamics of spins leads to several
+distinct features in spin density along the edge that originate from
+accumulation of turning points from many classical trajectories. Strong peak is
+found near a point of the vanishing of electron Fermi velocity in the lower
+spin-split subband. It is followed by a strip of negative spin density that
+extends until the crossing of the local Fermi energy with the degeneracy point
+where the two spin subbands intersect. Beyond this crossing there is a wide
+region of a smooth positive spin density. The total amount of spin accumulated
+in each of these features exceeds greatly the net spin across the entire edge.
+The features become more pronounced for shallower boundary potentials,
+controlled by gating in typical experimental setups.",0812.3609v2
+2012-02-04,Non-equilibrium spatial distribution of Rashba spin torque in ferromagnetic metal layer,"We study the spatial distribution of spin torque induced by a strong Rashba
+spin-orbit coupling (RSOC) in a ferromagnetic (FM) metal layer, using the
+Keldysh non-equilibrium Green's function method. In the presence of the s-d
+interaction between the non-equilibrium conduction electrons and the local
+magnetic moments, the RSOC effect induces a torque on the moments, which we
+term as the Rashba spin torque.
+  A correlation between the Rashba spin torque and the spatial spin current is
+presented in this work, clearly mapping the spatial distribution of Rashba Spin
+torque in a nano-sized ferromagnetic device. When local magnetism is turned on,
+the out-of-plane (Sz) Spin Hall effect (SHE) is disrupted, but rather
+unexpectedly an in-plane (Sy) SHE is detected. We also study the effect of
+Rashba strength (\alpha_R) and splitting exchange (\Delta) on the
+non-equilibrium Rashba spin torque averaged over the device. Rashba spin torque
+allows an efficient transfer of spin momentum such that a typical switching
+field of 20 mT can be attained with a low current density of less than 10^6
+A/cm^2.",1202.0890v2
+2012-07-21,Spin-torque efficiency enhanced by Rashba spin splitting in three dimensions,"We examine a spin torque induced by the Rashba spin-orbit coupling in three
+dimensions within the Boltzmann transport theory. We analytically calculate the
+spin torque and show how its behavior is related with the spin topology in the
+Fermi surfaces by studying the Fermi-energy dependence of the spin torque.
+Moreover we discuss the spin-torque efficiency which is the spin torque divided
+by the applied electric current in association with the current-induced
+magnetization reversal. It is found that high spin-torque efficiency is
+achieved when the Fermi energy lies on only the lower band and there exists an
+optimal value for the Rashba parameter, where the spin-torque efficiency
+becomes maximum.",1207.5094v1
+2012-11-13,Decay of Persistent Spin Helix due to the Spin Relaxation at Boundaries,"We study electron spin relaxation in one-dimensional structures of finite
+length in the presence of Bychkov-Rashba spin-orbit coupling and boundary spin
+relaxation. Using a spin kinetic equation approach, we formulate boundary
+conditions for the case of a partial spin polarization loss at the boundaries.
+These boundary conditions are used to derive corresponding boundary conditions
+for spin drift-diffusion equation. The later is solved analytically for the
+case of relaxation of a homogeneous spin polarization in 1D finite length
+structures. It is found that the spin relaxation consists of three stages (in
+some cases, two) -- an initial D'yakonov-Perel' relaxation is followed by spin
+helix formation and its subsequent decay. Analytical expressions for the decay
+time are found. We support our analytical results by results of Monte Carlo
+simulations.",1211.3139v1
+2014-09-30,Origin of inverse Rashba-Edelstein effect at Cu/Bi interface using lateral spin valves,"The spin transport and spin-to-charge current conversion properties of
+bismuth are investigated using permalloy/copper/bismuth (Py/Cu/Bi)lateral spin
+valve structures. The spin current is strongly absorbed at the surface of Bi,
+leading to ultra-short spin diffusion lengths. A spin-to-charge current
+conversion is measured, which is attributed to the inverse Rashba-Edelstein
+effect at the Cu/Bi interface. The spin-current-induced charge current is found
+to change direction with increasing temperature. A theoretical analysis relates
+this behavior to the complex spin structure and dispersion of the surface
+states at the Fermi energy. The understanding of this phenomenon opens novel
+possibilities to exploit spin-orbit coupling to create, manipulate, and detect
+spin currents in 2D systems.",1409.8540v2
+2016-01-15,Optical Spintronics in Organic-Inorganic Perovskite Photovoltaics,"Organic-inorganic halide CH$_3$NH$_3$PbI$_3$ solar cells have attracted
+enormous attention in recent years due to their remarkable power conversion
+efficiency. When inversion symmetry is broken, these materials should exhibit
+interesting spin-dependent properties as well, owing to their strong spin-orbit
+coupling. In this work, we consider the spin-dependent optical response of
+CH$_3$NH$_3$PbI$_3$. We first use density functional theory to compute the
+ballistic spin current generated by absorption of unpolarized light. We then
+consider diffusive transport of photogenerated charge and spin for a thin
+CH$_3$NH$_3$PbI$_3$ layer with a passivated surface and an Ohmic, non-selective
+contact. The spin density and spin current are evaluated by solving the
+drift-diffusion equations for a simplified 3-dimensional Rashba model of the
+electronic structure of the valence and conduction bands. We provide analytic
+expressions for the photon flux required to induce measurable spin densities,
+and propose that these spin densities can provide useful information about the
+role of grain boundaries in the photovoltaic behavior of these materials. We
+also discuss the prospects for measuring the optically generated spin current
+with the inverse spin Hall effect.",1601.04003v2
+2016-03-15,Designing Electron Spin Textures and Spin Interferometers by Shape Deformations,"We demonstrate that the spin orientation of an electron propagating in a
+one-dimensional nanostructure with Rashba spin-orbit (SO) coupling can be
+manipulated on demand by changing the geometry of the nanosystem. Shape
+deformations that result in a non-uniform curvature give rise to complex
+three-dimensional spin textures in space. We employ the paradigmatic example of
+an elliptically deformed quantum ring to unveil the way to get an
+all-geometrical and all-electrical control of the spin orientation. The
+resulting spin textures exhibit a tunable topological character with windings
+around the radial and the out-of-plane directions. We show that these
+topologically non trivial spin patterns affect the spin interference effect in
+the deformed ring, thereby resulting in different geometry-driven ballistic
+electronic transport behaviors. Our results establish a deep connection between
+electronic spin textures, spin transport and the nanoscale shape of the system.",1603.04655v2
+2016-06-30,Impurity-driven intervalley spin-flip scattering-induced 2D spin relaxation in silicon,"Through the theoretical study of electron spin lifetime in the 2DEG of doped
+Si, we highlight a dominant spin relaxation mechanism induced by the impurity
+central-cell potential near an interface via intervalley electron scattering.
+At low temperatures and with modest doping, this Yafet spin flip mechanism can
+become much more important than the Dyakonov-Perel spin relaxation indcued by
+the structural Rashba spin-orbit coupling field. As the leading-order
+impurity-induced spin flip happens only between two non-opposite valleys in Si,
+two-dimensional electron gas (2DEG) systems in Si MOSFETs or SiGe
+heterostructures are a natural platform to test and utilize this spin
+relaxation mechanism due to the valley splitting near the interface and its
+tunability by electrical gating or applied stress. Our proposed new spin
+relaxation mechanism may explain a part of the spin relaxation contribution to
+Si-based 2DEG systems.",1606.09578v2
+2019-05-19,Persistent spin helix in Rashba-Dresselhaus ferroelectric CsBiNb2O7,"Ferroelectric Rashba semiconductors (FERSC) are a novel class of
+multifunctional materials showing a giant Rashba spin splitting which can be
+reversed by switching the electric polarization. Although they are excellent
+candidates as channels in spin field effect transistors, the experimental
+research has been limited so far to semiconducting GeTe, in which ferroelectric
+switching is often prevented by heavy doping and/or large leakage currents.
+Here, we report that CsBiNb2O7, a layered perovskite of Dion-Jacobson type, is
+a robust ferroelectric with sufficiently strong spin-orbit coupling and spin
+texture reversible by electric field. Moreover, we reveal that its topmost
+valence band's spin texture is quasi-independent from the momentum, as a result
+of the low symmetry of its ferroelectric phase. The peculiar spin polarization
+pattern in the momentum space may yield the so-called ""persistent spin helix"",
+a specific spin-wave mode which protects the spin from decoherence in diffusive
+transport regime, potentially ensuring a very long spin lifetime in this
+material.",1905.07744v2
+2017-01-24,Spin mediated enhanced negative magnetoresistance in Ni80Fe20 and p-silicon bilayer,"In this work, we present an experimental study of spin mediated enhanced
+negative magnetoresistance in Ni80Fe20 (50 nm)/p-Si (350 nm) bilayer. The
+resistance measurement shows a reduction of ~2.5% for the bilayer specimen as
+compared to 1.3% for Ni80Fe20 (50 nm) on oxide specimen for an out-of-plane
+applied magnetic field of 3T. In the Ni80Fe20-only film, the negative
+magnetoresistance behavior is attributed to anisotropic magnetoresistance. We
+propose that spin polarization due to spin-Hall effect is the underlying cause
+of the enhanced negative magnetoresistance observed in the bilayer. Silicon has
+weak spin orbit coupling so spin Hall magnetoresistance measurement is not
+feasible. We use V2{\omega} and V3{\omega} measurement as a function of
+magnetic field and angular rotation of magnetic field in direction normal to
+electric current to elucidate the spin-Hall effect. The angular rotation of
+magnetic field shows a sinusoidal behavior for both V2{\omega} and V3{\omega},
+which is attributed to the spin phonon interactions resulting from the
+spin-Hall effect mediated spin polarization. We propose that the spin
+polarization leads to a decrease in hole-phonon scattering resulting in
+enhanced negative magnetoresistance.",1701.07049v1
+2014-05-28,Photoinduced pure spin current injection in graphene with Rashba spin-orbit interaction,"We propose a photoexcitation scheme for pure spin current generation in
+graphene subject to a Rashba spinorbit coupling. Although excitation using
+circularly-polarized light does not result in optical orientation of spins in
+graphene unless an additional magnetic field is present, we show that
+excitation with linearly-polarized light at normal incidence yields spin
+current injection without magnetic field. Spins are polarized within the
+graphene plane and are displaced in opposite directions, with no net charge
+displacement. The direction of the spin current is determined by the linear
+polarization axis of the light, and the injection rate is proportional to the
+intensity. The technique is tunable via an applied bias voltage and is
+accessible over a wide frequency range. We predict a spin current polarization
+as high as 75% for photon frequencies comparable to the Rashba frequency. Spin
+current injection via optical methods removes the need for ferromagnetic
+contacts, which have been identified as a possible source of spin scattering in
+electrical spin injection in graphene.",1405.7174v2
+2018-06-06,Control of magnetization dynamics by spin Nernst torque,"Control of magnetization dynamics is one of the primary goals in spintronics.
+It has been demonstrated using spin Hall effect i.e charge current to spin
+current conversion in non-magnetic metal which has large spin-orbit coupling
+such as Pt, W etc. Recently different groups have shown generation of spin
+current in Pt, W while thermal gradient is created by virtue of spin Nernst
+effect. In this work we show the evidence of magnetization control by spin
+Nernst torque in Pt/Py bi-layer. We compared relative strength of spin Nernst
+Torque and spin Hall torque by measuring the systematic variation of magnetic
+linewidth on application of constant heat or charge current. Spin-torque
+ferromagnetic resonance (ST-FMR) technique is adopted to excite the magnet and
+to measure line-width precisely from the symmetric and anti-symmetric voltage
+component. Control of magnetization dynamics by spin Nernst torque will emerge
+as an alternative way to manipulate nano-magnets.",1806.01978v1
+2019-12-19,Spin rotation by resonant electric field in few-level quantum dots: Floquet dynamics and tunneling,"We study electric dipole spin resonance caused by sub-terahertz (THz)
+radiation in a multilevel finite-size quantum dot formed in a nanowire focusing
+on the range of driving electric fields amplitudes where a strong interplay
+between the Rabi spin oscillations and tunneling from the dot to continuum
+states can occur. A strong effect of the tunneling on the spin evolution in
+this regime occurs due to formation of mixed spin states. As a result, the
+tunneling strongly limits possible spin manipulations time. We demonstrate a
+backaction of the spin dynamics on the tunneling and position of the electron.
+The analysis of the efficiency of the spin manipulation in terms of the system
+energy shows that tunneling decreases this efficiency. Fourier spectra of the
+time-dependent expectation value of the electron position show a strong effect
+of the spin-orbit coupling on their low-frequency components. This results can
+be applied to operational properties of spin-based nanodevices and extending
+the range of possible spin resonance frequencies to the THz domain.",1912.09054v2
+2020-05-18,Spin-Nematic Vortex States in Cold Atoms,"The (pseudo-)spin degrees of freedom greatly enriches the physics of cold
+atoms. This is particularly so for systems with high spins (i.e., spin quantum
+number larger than 1/2). For example, one can construct not only the rank-1
+spin vector, but also the rank-2 spin tensor in high spin systems. Here we
+propose a simple scheme to couple the spin tensor and the center-of-mass
+orbital angular momentum in a spin-1 cold atom system, and show that this leads
+to a new quantum phase of the matter: the spin-nematic vortex state that
+features vorticity in an SU(2) spin-nematic tensor subspace. Under proper
+conditions, such states are characterized by quantized topological numbers. Our
+work opens up new avenues of research in topological quantum matter with high
+spins.",2005.08498v2
+2020-09-16,Plasmon to exciton spin conversion in semiconductor-metal hybrid structures,"Optical control of electronic spins is the basis for ultrafast spintronics:
+circularly polarized light in combination with spin-orbit coupling of the
+electronic states allows for spin manipulation in condensed matter. However,
+the conventional approach is limited to spin orientation along one particular
+orientation that is dictated by the direction of photon propagation. Plasmonics
+opens new capabilities, allowing one to tailor the light polarization at the
+nanoscale. Here, we demonstrate ultrafast optical excitation of electron spin
+on femtosecond time scales via plasmon to exciton spin conversion. By
+time-resolving the THz spin dynamics in a hybrid (Cd,Mn)Te quantum well
+structure covered with a metallic grating, we unambiguously determine the
+orientation of the photoexcited electron spins which is locked to the
+propagation direction of surface plasmon-polaritons. Using the spin of the
+incident photons as additional degree of freedom, one can orient the
+photoexcited electron spin at will in a two-dimensional plane.",2009.07658v1
+2020-10-01,A roadmap for the design of four-terminal spin valves and the extraction of spin diffusion length,"Graphene is a promising substrate for future spintronics devices owing to its
+remarkable electronic mobility and low spin-orbit coupling. Hanle precession in
+spin valve devices is commonly used to evaluate the spin diffusion and spin
+lifetime properties. In this work, we demonstrate that this method is no longer
+accurate when the distance between inner and outer electrodes is smaller than
+six times the spin diffusion length, leading to errors as large as 50% for the
+calculations of the spin figures of merit of graphene. We suggest simple but
+efficient approaches to circumvent this limitation by addressing a revised
+version of the Hanle fit function. Complementarily, we provide clear guidelines
+for the design of four-terminal spin valves able to yield flawless estimations
+of the spin lifetime and the spin diffusion coefficient.",2010.00669v1
+2022-08-20,Many-body theory of phonon-induced spin relaxation and decoherence,"First-principles calculations enable accurate predictions of electronic
+interactions and dynamics. However, computing the electron spin dynamics
+remains challenging. The spin-orbit interaction causes various dynamical
+phenomena that couple with phonons, such as spin precession and spin-flip e-ph
+scattering, which are difficult to describe with current first-principles
+calculations. In this work, we show a rigorous framework to study
+phonon-induced spin relaxation and decoherence, by computing the spin-spin
+correlation function and its vertex corrections due to e-ph interactions. We
+apply this approach to a model system and develop corresponding
+first-principles calculations of spin relaxation in GaAs. Our vertex-correction
+formalism is shown to capture the Elliott-Yafet, Dyakonov-Perel, and
+strong-precession mechanisms - three independent spin decoherence regimes with
+distinct physical origins - thereby unifying their theoretical treatment and
+calculation. Our method is general and enables quantitative studies of spin
+relaxation, decoherence, and transport in a wide range of materials and
+devices.",2208.09575v1
+2022-09-27,Spin-charge separation and quantum spin Hall effect of $β$-bismuthene,"Field theory arguments suggest the possibility of $\mathbb{Z}$-classification
+of quantum spin Hall effect with magnetic flux tubes, that cause separation of
+spin and charge degrees of freedom, and pumping of spin or Kramers pair.
+However, the \emph{proof of principle} demonstration of spin-charge separation
+is yet to be accomplished for realistic, \emph{ab initio} band structures of
+spin-orbit-coupled materials, lacking spin-conservation law. In this work, we
+perform thought experiments with magnetic flux tubes on $\beta$-bismuthene to
+demonstrate spin-charge separation, and quantized pumping of spin for three
+insulating states that can be accessed by tuning filling fractions. With a
+combined analysis of momentum-space topology and real-space response, we
+identify important role of topologically non-trivial bands, supporting even
+integer winding numbers, which cannot be inferred from symmetry-based
+indicators. Our work sets a new standard for prediction of two-dimensional,
+quantum spin-Hall materials, based on precise bulk invariant and universal
+topological response.",2209.13582v1
+2005-02-09,"SU(2)xU(1) unified theory for charge, orbit and spin currents","Spin and charge currents in systems with Rashba or Dresselhaus spin-orbit
+couplings are formulated in a unified version of four-dimensional
+SU(2)$\times$U(1) gauge theory, with U(1) the Maxwell field and SU(2) the
+Yang-Mills field. While the bare spin current is non-conserved, it is
+compensated by a contribution from the SU(2) gauge field, which gives rise to a
+spin torque in the spin transport, consistent with the semi-classical theory of
+Culcer et al. Orbit current is shown to be non-conserved in the presence of
+electromagnetic fields. Similar to the Maxwell field inducing forces on charge
+and charge current, we derive forces acting on spin and spin current induced by
+the Yang Mills fields such as the Rashba and Dresselhaus fields and the sheer
+strain field. The spin density and spin current may be considered as a source
+generating Yang-Mills field in certain condensed matter systems.",0502231v4
+2012-03-02,Three-Dimensional Spin Rotations at the Fermi Surface of a Strongly Spin-Orbit Coupled Surface System,"The spin texture of the metallic two-dimensional electron system (root3 x
+root3)-Au/Ge(111) is revealed by fully three-dimensional spin-resolved
+photoemission, as well as by density functional calculations. The large
+hexagonal Fermi surface, generated by the Au atoms, shows a significant
+splitting due to spin-orbit interactions. The planar components of the spin
+exhibit helical character, accompanied by a strong out-of-plane spin component
+with alternating signs along the six Fermi surface sections. Moreover, in-plane
+spin rotations towards a radial direction are observed close to the hexagon
+corners. Such a threefold-symmetric spin pattern is not described by the
+conventional Rashba model. Instead, it reveals an interplay with
+Dresselhaus-like spin-orbit effects as a result of the crystalline
+anisotropies.",1203.0520v1
+2019-01-28,Strong damping-like spin-orbit torque and tunable Dzyaloshinskii-Moriya interaction generated by low-resistivity Pd$_{1-x}$Pt$_x$ alloys,"Despite their great promise for providing a pathway for very efficient and
+fast manipulation of magnetization at the nanoscale, spin-orbit torque (SOT)
+operations are currently energy inefficient due to a low damping-like SOT
+efficiency per unit current bias, and/or the very high resistivity of the spin
+Hall materials. Here, we report an advantageous spin Hall material, Pd1-xPtx,
+which combines a low resistivity with a giant spin Hall effect as evidenced
+through the use of three independent SOT ferromagnetic detectors. The optimal
+Pd0.25Pt0.75 alloy has a giant internal spin Hall ratio of >0.47 (damping-like
+SOT efficiency of ~ 0.26 for all three ferromagnets) and a low resistivity of
+~57.5 {\mu}{\Omega} cm at 4 nm thickness. Moreover, we find the
+Dzyaloshinskii-Moriya interaction (DMI), the key ingredient for the
+manipulation of chiral spin arrangements (e.g. magnetic skyrmions and chiral
+domain walls), is considerably strong at the Pd1-xPtx/Fe0.6Co0.2B0.2 interface
+when compared to that at Ta/Fe0.6Co0.2B0.2 or W/Fe0.6Co0.2B0.2 interfaces and
+can be tuned by a factor of 5 through control of the interfacial spin-orbital
+coupling via the heavy metal composition. This work establishes a very
+effective spin current generator that combines a notably high energy efficiency
+with a very strong and tunable DMI for advanced chiral spintronics and spin
+torque applications.",1901.09954v1
+2022-01-21,A single hole spin with enhanced coherence in natural silicon,"Semiconductor spin qubits based on spin-orbit states are responsive to
+electric field excitation allowing for practical, fast and potentially scalable
+qubit control. Spin-electric susceptibility, however, renders these qubits
+generally vulnerable to electrical noise, which limits their coherence time.
+Here we report on a spin-orbit qubit consisting of a single hole
+electrostatically confined in a natural silicon metal-oxide-semiconductor
+device. By varying the magnetic field orientation, we reveal the existence of
+operation sweet spots where the impact of charge noise is minimized while
+preserving an efficient electric-dipole spin control. We correspondingly
+observe an extension of the Hahn-echo coherence time up to 88 $\mu$s, exceeding
+by an order of magnitude the best reported values for hole-spin qubits, and
+approaching the state-of-the-art for electron spin qubits with synthetic
+spin-orbit coupling in isotopically-purified silicon. This finding largely
+enhances the prospects of silicon-based hole spin qubits for scalable quantum
+information processing.",2201.08637v2
+2022-06-11,Chirality as Generalized Spin-Orbit Interaction in Spintronics,"This review focuses on the chirality observed in the excited states of the
+magnetic order, dielectrics, and conductors that hold transverse spins when
+they are evanescent. Even without any relativistic effect, the transverse spin
+of the evanescent waves are locked to the momentum and the surface normal of
+their propagation plane. This chirality thereby acts as a generalized
+spin-orbit interaction, which leads to the discovery of various chiral
+interactions between magnetic, phononic, electronic, photonic, and plasmonic
+excitations in spintronics that mediate the excitation of quasiparticles into a
+single direction, leading to phenomena such as chiral spin and phonon pumping,
+chiral spin Seebeck, spin skin, magnonic trap, magnon Doppler, and spin diode
+effects. Intriguing analogies with electric counterparts in the nano-optics and
+plasmonics exist. After a brief review of the concepts of chirality that
+characterize the ground state chiral magnetic textures and chirally coupled
+magnets in spintronics, we turn to the chiral phenomena of excited states. We
+present a unified electrodynamic picture for dynamical chirality in spintronics
+in terms of generalized spin-orbit interaction and compare it with that in
+nano-optics and plasmonics. Based on the general theory, we subsequently review
+the theoretical progress and experimental evidence of chiral interaction, as
+well as the near-field transfer of the transverse spins, between various
+excitations in magnetic, photonic, electronic and phononic nanostructures at
+GHz time scales. We provide a perspective for future research before concluding
+this article.",2206.05535v2
+2023-05-24,Charged spinning and magnetized test particles orbiting quantum improved charged black holes,"In the present work, we aimed to investigate the dynamics of spinning charged
+and magnetized test particles around both electrically and magnetically charged
+quantum-improved black holes. We derive the equations of motion for charged
+spinning test particles using the Mathisson-Papapetrou-Dixon equations with the
+Lorentz coupling term. The radius of innermost stable circular orbits (ISCOs),
+specific angular momentum, and energy for charged spinless, uncharged spinning,
+and charged spinning test particles around the charged and non-charged
+quantum-improved black holes are analyzed separately. We found that the quantum
+parameter increases the maximum spin value, $s_\text{max}$, which leads to the
+nonphysical motion (superluminal motion) of the charged spinning test particle,
+whereas the black hole charge decreases its value. We also found that, in
+contrast to the Reissner Nordstr\""om black hole, spinning charged test
+particles in the quantum-improved charged black hole have higher
+$s_\text{max}$; moreover, positively charged spinning particles can have higher
+values of $s_\text{max}$ near the extreme black hole cases when compared with
+uncharged spinning particles. Finally, we investigate the magnetized test
+particle's dynamics around a quantum-improved magnetically charged black hole
+in Quantum Einstein Gravity using the Hamilton-Jacobi equation. We show that
+the presence of $\omega$ increases the maximum value of the effective potential
+and decreases the minimum energy and angular momentum of magnetized particles
+at their circular orbits. We found an upper constraint in the black hole charge
+at the ISCO.",2305.15350v1
+1997-09-24,Ultrafast Spin Dynamics in Nickel,"The spin dynamics in Ni is studied by an exact diagonalization method on the
+ultrafast time scale. It is shown that the femtosecond relaxation of the
+magneto-optical response results from exchange interaction and spin-orbit
+coupling. Each of the two mechanisms affects the relaxation process
+differently. We find that the intrinsic spin dynamics occurs during about 10 fs
+while extrinsic effects such as laser-pulse duration and spectral width can
+slow down the observed dynamics considerably. Thus, our theory indicates that
+there is still room to accelerate the spin dynamics in experiments.",9709264v1
+2001-07-04,Chiral Correction to the Spin Fluctuation Feedback in two-dimensional p-wave Superconductors,"We consider the stability of the superconducting phase for spin-triplet
+p-wave pairing in a quasi-two-dimensional system. We show that in the absence
+of spin-orbit coupling there is a chiral contribution to spin fluctuation
+feedback which is related to spin quantum Hall effect in a chiral
+superconducting phase. We show that this mechanism supports the stability of a
+chiral p-wave state.",0107096v2
+2002-11-11,Pumping spin with electrical fields,"Spin currents can be obtained through adiabatic pumping by means of
+electrical gating only. This is possible by making use of the tunability of the
+Rashba spin-orbit coupling in semiconductor heterostructures. We demonstrate
+the principles of this effect by considering a single-channel wire with a
+constriction. We also consider realistic structures, consisting of several open
+channels where subband spin-mixing and disorder are present, and we confirm our
+predictions. Two different ways to detect the spin-pumping effect, either using
+ferromagnetic leads or applying a magnetic field, are discussed.",0211211v2
+2003-01-06,The Effect of Ramsauer Type Transmission Resonances on the Conductance Modulation of Spin Interferometers,"We use a mean field approach to study the conductance modulation of gate
+controlled semiconductor spin interferometers based on the Rashba spin-orbit
+coupling effect. The conductance modulation is found to be mostly due to
+Ramsauer type transmission resonances rather than the Rashba effect in typical
+structures. This is because of significant reflections at the interferometer's
+contacts due to large potential barriers and effective mass mismatch between
+the contact material and the semiconductor. Thus, unless particular care is
+taken to eliminate these reflections, any observed conductance modulation of
+spin interferometers may have its origin in the Ramsauer resonances (which is
+unrelated to spin) rather than the Rashba effect.",0301052v1
+2003-04-17,Spin Readout and Initialization in a Semiconductor Quantum Dot,"Electron spin qubits in semiconductors are attractive from the viewpoint of
+long coherence times. However, single spin measurement is challenging. Several
+promising schemes incorporate ancillary tunnel couplings that may provide
+unwanted channels for decoherence. Here, we propose a novel spin-charge
+transduction scheme, converting spin information to orbital information within
+a single quantum dot by microwave excitation. The same quantum dot can be used
+for rapid initialization, gating, and readout. We present detailed modeling of
+such a device in silicon to confirm its feasibility.",0304422v2
+2003-09-05,Spinning Holes in Semiconductors,"The electron spin is emerging as a new powerful tool in the electronics and
+optics industries. Many proposed applications involve the creation of spin
+currents, which so far have proven to be difficult to produce in semiconductor
+environments. A new theoretical analysis shows this might be achieved using
+holes rather than electrons in semiconductors with significant spin-orbit
+coupling.",0309154v1
+2003-10-02,Spin relaxations in semiconductor quantum dots,"The spin relaxation time due to the electron-acoustic phonon scattering in
+GaAs quantum dots is studied after the exact diagonalization of the electron
+Hamiltonian with the spin-orbit coupling. Different effects such as the
+magnetic field, the quantum dot size, the temperature as well as the electric
+field on the spin relaxation time are investigated in detail. Moreover, we show
+that the perturbation method widely used in the literature is inadequate in
+accounting for the electron structure and therefore the spin relaxation time.",0310039v2
+2004-11-18,"Imaging spin flows in semiconductors subject to electric, magnetic, and strain fields","Using scanning Kerr microscopy, we directly acquire two-dimensional images of
+spin-polarized electrons flowing laterally in bulk epilayers of n:GaAs. Optical
+injection provides a local dc source of polarized electrons, whose subsequent
+drift and/or diffusion is controlled with electric, magnetic, and - in
+particular - strain fields. Spin precession induced by controlled uniaxial
+stress along the <110> axes demonstrates the direct k-linear spin-orbit
+coupling of electron spin to the shear (off-diagonal) components of the strain
+tensor.",0411461v1
+2004-12-15,Control of spin coherence in $n$-type GaAs quantum wells using strain,"We show that the bulk-inversion-asymmetry-type strain-induced spin-orbit
+coupling can be used to effectively modify the Dresselhaus spin splitting in
+(001) GaAs quantum wells with small well width and the resulting spin lifetime
+can be increased by two orders of magnitude to nanoseconds under right
+conditions. The efficiency of this strain manipulation of the spin dephasing
+time under different conditions such as temperature, electric field and
+electron density is investigated in detail.",0412385v2
+2005-04-02,General Electrical Manipulations of Electron Spin,"Traditionally, the interactions related to the 3D spatial angular momentum
+have been studied completely, while the ones related to the generators of
+Lorentz boost are always ignored. In this paper we show that the generators of
+Lorentz boost have a nontrivial physical significance in quantum mechanics, and
+try to propose a most general theory about electrical manipulations of electron
+spin, where a new treatment and interpretation for the traditional Darwin term
+and spin-orbit coupling is given via the concept of electron's induced electric
+moment. Some electrostatic fields can even affect the spin quantum states of a
+resting electron, and parallel electric and magnetic fields can be
+simultaneously applied to fix on the spin orientation of electron.",0504049v1
+2005-05-21,Theory of Spin Hall conductivity in n-doped GaAs,"We develop a theory of extrinsic spin currents in semiconductors, resulting
+from spin-orbit coupling at charged scatterers, which leads to skew scattering
+and side jump contributions to the spin Hall conductance. Applying the theory
+to bulk n-GaAs, without any free parameters, we find spin currents that are in
+reasonable agreement with recent experiments by Kato et al. [Science 306, 1910
+(2004)].",0505535v1
+2005-07-20,Spin-lattice relaxation phenomena in manganite La0.7Sr0.3MnO3 thin films,"Time-resolved magneto-optics was used to study spin-lattice relaxation
+dynamics in thin epitaxial La0.7Sr0.3MnO3 films. Two distinct recovery regimes
+of the ferromagnetic order can be resolved upon photoexcitation, which manifest
+themselves by two different relaxation times. A pump pulse energy independent
+spin-lattice relaxation time can be deduced. Due to a weak spin-orbit coupling
+in manganites this spin-lattice relaxation time is much longer than in
+ferromagnetic metals. Heat flow into the substrate sets the ultimate recovery
+speed of the ferromagnetic order and allows for a determination of heat
+diffusion properties of manganite films.",0507481v1
+2005-07-26,Resonant intrinsic spin Hall effect in p-type GaAs quantum well structure,"We study intrinsic spin Hall effect in p-type GaAs quantum well structure
+described by Luttinger Hamiltonian and a Rashba spin-orbit coupling arising
+from the structural inversion symmetry breaking. The Rashba term induces an
+energy level crossing in the lowest heavy hole subband, which gives rise to a
+resonant spin Hall conductance. The resonance may be used to identify the
+intrinsic spin Hall effect in experiments.",0507603v1
+2007-03-08,Spin transverse force and quantum transverse transport,"We present a brief review on spin transverse force, which exerts on the spin
+as the electron is moving in an electric field. This force, analogue to the
+Lorentz force on electron charge, is perpendicular to the electric field and
+spin current carried by the electron. The force stems from the spin-orbit
+coupling of electrons as a relativistic quantum effect, and could be used to
+understand the Zitterbewegung of electron wave packet and the quantum
+transverse transport of electron in a heuristic way.",0703196v1
+2007-11-13,Intrinsic Spin Hall Effect Induced by Quantum Phase Transition in HgCdTe Quantum Wells,"Spin Hall effect can be induced both by the extrinsic impurity scattering and
+by the intrinsic spin-orbit coupling in the electronic structure. The HgTe/CdTe
+quantum well has a quantum phase transition where the electronic structure
+changes from normal to inverted. We show that the intrinsic spin Hall effect of
+the conduction band vanishes on the normal side, while it is finite on the
+inverted side. This difference gives a direct mechanism to experimentally
+distinguish the intrinsic spin Hall effect from the extrinsic one.",0711.1900v1
+2008-02-10,Equilibrium spin currents: Non-Abelian gauge invariance and color diamagnetism in condensed matter,"The spin-orbit (SO) interaction in condensed matter can be described in terms
+of a non-Abelian potential known in high-energy physics as a color field. I
+show that a magnetic component of this color field inevitably generates
+diamagnetic color currents which are just the equilibrium spin currents
+discussed in a condensed matter context. These dissipationless spin currents
+thus represent a universal property of systems with SO interaction. In
+semiconductors with linear SO coupling the spin currents are related to the
+effective non-Abelian field via Yang-Mills magnetostatics equation.",0802.1350v1
+2008-08-28,Electric excitation of spin resonance in antiferromagnetic conductors,"Antiferromagnetism couples electron spin to its orbital motion, thus allowing
+excitation of electron-spin transitions by an ac electric rather than magnetic
+field - with absorption, exceeding that of common electron spin resonance at
+least by four orders of magnitude. In addition to potential applications in
+spin electronics, this phenomenon may be used as a spectroscopy to study
+antiferromagnetic materials of interest - from chromium to borocarbides,
+cuprates, iron pnictides, and organic and heavy fermion conductors.",0808.3946v2
+2008-09-24,Gated combo nanodevice for sequential operations on single electron spin,"An idea for a nanodevice in which an arbitrary sequence of three basic
+quantum single qubit gates - negation, Hadamard and phase shift - can be
+performed on a single electron spin. The spin state is manipulated using the
+spin-orbit coupling and the electron trajectory is controlled by the electron
+wave function self-focusing mechanism due to the electron interaction with the
+charge induced on metal gates. We present results of simulations based on
+iterative solution of the time dependent Schr\""odinger equation in which the
+subsequent operations on the electron spin can be followed and controlled.
+Description of the moving electron wave packet requires evaluation of the
+electric field within the entire nanodevice in each time step.",0809.4195v1
+2009-07-24,Electrical measurement of a two-electron spin state in a double quantum dot,"We propose a scheme for electrical measurement of two-electron spin states in
+a semiconductor double quantum dot. We calculated the adiabatic charge transfer
+when surface gates are modulated in time. Because of spin-orbit coupling in the
+semiconductor, spatial displacement of the electrons causes a total spin
+rotation. It follows that the expectation value of the transferred charge
+reflects the relative phase as well as the total spin population of a prepared
+singlet-triplet superposition state. The precise detection of the charge
+transfer serves to identify the quantum superposition.",0907.4191v1
+2009-08-20,Superconducting state in the non-centrosymmetric Mg_{9.3}Ir_{19}B_{16.7} and Mg_{10.5}Ir_{19}B_{17.1} revealed by NMR,"We report ^{11}B NMR measurements in non-centrosymmetric superconductors
+Mg_{9.3}Ir_{19}B_{16.7} (T_c=5.8 K) and Mg_{10.5}Ir_{19}B_{17.1} (T_c=4.8 K).
+The spin lattice relaxation rate and the Knight shift indicate that the Cooper
+pairs are predominantly in the spin-singlet state with an isotropic gap.
+However, Mg_{10.5}Ir_{19}B_{17.1} is found to have more defects and the spin
+susceptibility remains finite even in the zero-temperature limit. We interpret
+this result as that the defects enhance the spin-orbit coupling and bring about
+more spin-triplet component.",0908.2894v1
+2010-01-05,Edge-induced spin polarization in two-dimensional electron gas,"We characterize the role of the spin-orbit coupling between electrons and the
+confining potential of the edge in nonequilibrium 2D homogeneous electronic
+gas. We derive a simple analytical result for the magnitude of the current
+induced spin polarization at the edge and prove that it is independent of the
+details of the confinement edge potential and the electronic density within
+realistic values of the parameters of the considered models. While the
+amplitude of the spin accumulation is comparable to the experimental values of
+extrinsic spin Hall effect in similar samples, the spatial extent of edge
+induced effect is restricted to the distances of the order of Fermi wavelength
+($\sim$ 10nm).",1001.0720v1
+2012-08-24,Fast and robust spin manipulation in a quantum dot by electric fields,"We apply an invariant-based inverse engineering method to control by
+time-dependent electric fields electron spin dynamics in a quantum dot with
+spin-orbit coupling in a weak magnetic field. The designed electric fields
+provide a shortcut to adiabatic processes that flips the spin rapidly, thus
+avoiding decoherence effects. This approach, being robust with respect to the
+device-dependent noise, can open new possibilities for the spin-based quantum
+information processing.",1208.4890v2
+2012-09-09,Neutron Brillouin scattering with pulsed spallation neutron source - spin-wave excitations from ferromagnetic powder samples -,"Neutron Brillouin scattering (NBS) method was developed using a pulsed
+spallation neutron source, and the feasibility of NBS was demonstrated by
+observing ferromagnetic spin waves in La$_{0.8}$Sr$_{0.2}$MnO$_3$ and SrRuO$_3$
+powders. Gapless spin-wave excitations were observed in
+La$_{0.8}$Sr$_{0.2}$MnO$_3$, which were continuously extended to the lower
+scattering vector $Q$ from previous results using single crystals. The novel
+result is a well-defined quadratic $Q$ dependence in the spin-wave dispersion
+curve with a large energy gap in SrRuO$_3$ indicating robust spin-orbit
+coupling.",1209.1780v1
+2012-11-22,Spin Hall effect in graphene due to random Rashba field,"Spin Hall effect due to random Rashba spin-orbit coupling in the
+two-dimensional honeycomb lattice of carbon atoms (graphene) is considered
+theoretically. Using the Green function method and diagrammatic technique we
+show that fluctuations of the Rashba interaction around zero average value give
+rise to nonzero spin Hall conductivity. Generally, the conductivity is not
+universal, but depends on the ratio of the total momentum and spin-flip
+relaxation rates.",1211.5222v1
+2012-12-08,Tensor coupling and relativistic spin and pseudospin symmetries with the Hellmann potential,"The Hellmann potential is a superposition potential that consists of an
+attractive Coulomb potential and a Yukawa potential. By using the generalized
+parametric Nikiforov-Uvarov (NU) method, we have studied the approximate
+analytical solutions of the Dirac equation with the Hellmann potential
+including a Coulomb-like tensor potential for arbitrary spin-orbit quantum
+number k under the presence of exact spin and pseudo-spin (p-spin) symmetries.
+We show that tensor interaction removes degeneracies between spin and
+pseudospin doublets. As particular cases, we found the energy levels of
+non-relativistic case and also the pure Coulomb potential energy levels.",1212.1830v1
+2013-10-10,Effect of gate-driven spin resonance on the conductance of a one-dimensional quantum wire,"We consider quasiballistic electron transmission in a one-dimensional quantum
+wire subject to both time-independent and periodic potentials of a finger gate
+that results in a coordinate- and time-dependent Rashba-type spin-orbit
+coupling. A spin-dependent conductance is calculated as a function of external
+constant magnetic field, the electric field frequency, and the potential
+strength. The results demonstrate the effect of the gate-driven electric dipole
+spin resonance in a transport phenomenon such as spin-flip electron
+transmission.",1310.2914v1
+2014-07-14,Intrinsic magnetoresistance in metal films on ferromagnetic insulators,"We predict a magnetoresistance induced by the interfacial Rashba spin-orbit
+coupling in normal metal|ferromagnetic insulator bilayer. It depends on the
+angle between current and magnetization directions identically to the ""spin
+Hall magnetoresistance"" mechanism caused by a combined action of spin Hall and
+inverse spin Hall effects. Due to the identical phenomenology it is not obvious
+whether the magnetoresistance reported by Nakayama et al. is a bulk metal or
+interface effect. The interfacial Rashba induced magnetoresistance may be
+distinguished from the bulk metal spin Hall magnetoresistance by its dependence
+on the metal film thickness.",1407.3571v1
+2015-09-08,Anomalous Hall effect driven by dipolar spin waves in uniform ferromagnets,"A new type of anomalous Hall effect is shown to arise from the interaction of
+conduction electrons with dipolar spin waves in ferromagnets. This effect
+exists even in homogeneous ferromagnets without relativistic spin-orbit
+coupling. The leading contribution to the Hall conductivity is proportional to
+the chiral spin correlation of dynamical spin textures and is physically
+understood in terms of the skew scattering by dipolar magnons.",1509.02284v1
+2016-01-07,A novel method to evaluate spin diffusion length of Pt,"Spin diffusion length of Pt is evaluated via proximity effect of spin orbit
+coupling (SOC) and anomalous Hall effect (AHE) in Pt/Co2FeAl bilayers. By
+varying the thicknesses of Pt and Co2FeAl layer, the thickness dependences of
+AHE parameters can be obtained, which are theoretically predicted to be
+proportional to the square of the SOC strength. According to the physical image
+of the SOC proximity effect, the spin diffusion length of Pt can easily be
+identified from these thickness dependences. This work provides a novel method
+to evaluate spin diffusion length in a material with a small value.",1601.01371v1
+2016-02-23,Spontaneous Spin Textures in Multiorbital Mott Systems,"Spin textures in k-space arising from spin-orbit coupling in
+non-centrosymmetric crystals find numerous applications in spintronics. We
+present a mechanism that leads to appearance of k-space spin texture due to
+spontaneous symmetry breaking driven by electronic correlations. Using
+dynamical mean-field theory we show that doping a spin-triplet excitonic
+insulator provides a means of creating new thermodynamic phases with unique
+properties. The numerical results are interpreted using analytic calculations
+within a generalized double-exchange framework.",1602.07122v3
+2016-11-22,Electron spin dynamics of two-dimensional layered materials,"The growing library of two-dimensional layered materials is providing
+researchers with a wealth of opportunity to explore and tune physical phenomena
+at the nanoscale. Here, we review the experimental and theoretical state-of-art
+concerning the electron spin dynamics in graphene, silicene, phosphorene,
+transition metal dichalcogenides, covalent heterostructures of organic
+molecules and topological materials. The spin transport, chemical and defect
+induced magnetic moments, and the effect of spin-orbit coupling and spin
+relaxation, are also discussed in relation to the field of spintronics.",1611.07208v1
+2013-09-13,Skyrmion spin texture in ferromagnetic semiconductor-superconductor heterostructures,"We provide a derivation of a spin Skyrmion number classification for
+two-dimensional topological superconductors constructed from ferromagnetic and
+Rashba spin-orbit coupled semiconductor-superconductor heterostructures. We
+show that in the non-trivial topological phase, characterized by a non-zero
+Chern number, there is always a topological spin texture in the occupied bands
+represented by a Skyrmion number. The Skyrmion number has the advantage of
+being both physically intuitive and directly measurable using spin-sensitive
+band structure imaging techniques. In addition, we show that the Skyrmion
+classification can be extended to the equivalent one-dimensional topological
+superconductors.",1309.3411v2
+2015-12-03,Unconventional superconductivity and anomalous response in hole-doped transition metal dichalcogenides,"Two-dimensional transition metal dichalcogenides entwine interaction,
+spin-orbit coupling, and topology. Hole-doped systems lack spin degeneracy:
+states are indexed with spin and valley specificity. This unique structure
+offers new possibilities for correlated phases and phenomena. We realize an
+unconventional superconducting pairing phase which is an equal mixture of a
+spin singlet and the $m = 0$ spin triplet. It is stable against large in-plane
+magnetic fields, and its topology allows quasiparticle excitations of net
+nonzero Berry curvature via pair-breaking circularly polarized light.",1512.01261v3
+2016-05-21,Electrically tunable quantum interfaces between photons and spin qubits in carbon nanotube quantum dots,"We present a new scheme for quantum interfaces to accomplish the
+interconversion of photonic qubits and spin qubits based on optomechanical
+resonators and the spin-orbit-induced interactions in suspended carbon nanotube
+quantum dots. This interface implements quantum spin transducers and further
+enables electrical manipulation of local electron spin qubits, which lays the
+foundation for all-electrical control of state transfer protocols between two
+distant quantum nodes in a quantum network. We numerically evaluate the state
+transfer processes and proceed to estimate the effect of each coupling strength
+on the operation fidelities.",1605.06649v1
+2016-08-03,Nuclear spin-lattice relaxation rate in noncentrosymmetric superconductor Y$_2$C$_3$,"For a noncentrosymmetric superconductor such as Y$_2$C$_3$, we consider a
+parity-mixing model composed of spin-singlet s-wave and spin-triplet f-wave
+pairing components.
+  The $d$-vector in f-wave state is chosen to be parallel to the Dresselhaus
+asymmetric spin-orbit coupling vector.
+  It is found that, the quasiparticle excitation spectrum exhibits distinct
+nodal structure as a consequence of parity-mixing. Our calculation predict
+anomalous noninteger power laws for low-temperature nuclear spin-lattice
+relaxation rate $T_{1}^{-1}$.
+  We demonstrate particularly that such a model can qualitatively account for
+the existing experimental results of the temperature dependence of $T_{1}^{-1}$
+in Y$_2$C$_3$.",1608.01190v1
+2017-06-16,Conservation of spin supercurrents in superconductors,"We demonstrate that spin supercurrents are conserved upon transmission
+through a conventional superconductor, even in the presence of spin-dependent
+scattering by impurities with magnetic moments or spin-orbit coupling. This is
+fundamentally different from conventional spin currents, which decay in the
+presence of such scattering, and this has important implications for the usage
+of superconducting materials in spintronic hybrid structures.",1706.05377v3
+2018-09-24,Qubit gates with simultaneous transport in double quantum dots,"A single electron spin in a double quantum dot in a magnetic field is
+considered in terms of a four-level system. By describing the electron motion
+between the potential minima by spin-conserving tunneling and spin flip caused
+by a spin-orbit coupling, we inversely engineer faster-than-adiabatic state
+manipulation operations based on the geometry of four-dimensional (4D)
+rotations. In particular, we show how to transport a qubit among the quantum
+dots performing simultaneously a required spin rotation.",1809.08952v1
+2021-01-21,Kubo formulae for first-order spin hydrodynamics,"We derive Kubo formulae for first-order spin hydrodynamics based on
+non-equilibrium statistical operators method. In first-order spin
+hydrodynamics, there are two new transport coefficients besides the ordinary
+ones appearing in first-order viscous hydrodynamics. They emerge due to the
+incorporation of the spin degree of freedom into fluids and the spin-orbital
+coupling. Zubarev's non-equilibrium statistical operator method can be well
+applied to investigate these quantum effects in fluids. The Kubo formulae,
+based on the method of non-equilibrium statistical operators, are related to
+equilibrium (imaginary-time) infrared Green's functions, and all the transport
+coefficients can be determined when the microscopic theory is specified.",2101.08440v2
+2017-09-26,Probing chiral edge states in topological superconductors through spin-polarized local density of state measurements,"We show that spin-polarized local density of states (LDOS) measurements can
+uniquely determine the chiral nature of topologically protected edge states
+surrounding a ferromagnetic island embedded in a conventional superconductor
+with spin-orbit coupling. The spin-polarized LDOS show a strong
+spin-polarization directly tied to the normal direction of the edge, with
+opposite polarizations on opposite sides of the island, and with a distinct
+oscillatory pattern in energy.",1709.09061v1
+2022-05-30,Fledgling quantum spin Hall effect in pseudo gap phase of Bi2212,"We study the emergence of the quantum spin Hall (QSH) states for the
+pseudo-gap (PG) phase of Bi2212 bilayer system, assumed to be D-density
+wave(DDW) ordered, starting with a strong Rashba spin-orbit coupling(SOC)
+armed, and the time reversal symmetry (TRS) complaint Bloch Hamiltonian. The
+presence of strong SOC gives rise to non-trivial, spin-momentum locked spin
+texture tunable by electric field. The emergence of quantum anomalous Hall
+effect with TRS broken Chiral DDW Hamiltonian of Das Sarma et al. is found to
+be possible.",2205.15010v1
+2022-07-12,Generation of polarized spin-triplet Cooper pairings by magnetic barriers in superconducting junctions,"We investigate the proximity effect in an s-wave superconductor/ferromagnetic
+metal with a Rashba spin-orbit coupling/diffusive normal metal junction and an
+s-wave superconductor/noncollinear magnetic metal/diffusive normal metal
+junction. We show the generation of equal spin-triplet pairings in the
+diffusive normal metal due to spin-flip scattering in the intermediate magnetic
+regions. The emergence of the spin-triplet odd-frequency Cooper pairings can
+generate a zero-energy peak in the quasiparticle density of states in the
+diffusive normal metal.",2207.05400v2
+2022-12-21,Spin susceptibility of nonunitary spin-triplet superconductors,"The spin susceptibility is an important probe to characterize the symmetry of
+the order parameter in unconventional superconductors. Among them, nonunitary
+triplet superconductors have attracted a lot of attention recently in the
+context of the search for topological superconductivity. Here, we derive a
+general formula for the spin susceptibility of nonunitary triplet
+superconductors within a single-band model of non-magnetic, centrosymmetric
+materials with strong spin-orbit coupling. We use it to critically assess
+experimental claims of nonunitary triplet superconductivity in some materials.",2212.11226v1
+2016-06-15,Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings,"Microwave-frequency superconducting resonators are ideally suited to perform
+dispersive qubit readout, to mediate two-qubit gates, and to shuttle states
+between distant quantum systems. A prerequisite for these applications is a
+strong qubit-resonator coupling. Strong coupling between an electron-spin qubit
+and a microwave resonator can be achieved by correlating spin- and orbital
+degrees of freedom. This correlation can be achieved through the Zeeman
+coupling of a single electron in a double quantum dot to a spatially
+inhomogeneous magnetic field generated by a nearby nanomagnet. In this paper,
+we consider such a device and estimate spin-resonator couplings of order ~ 1
+MHz with realistic parameters. Further, through realistic simulations, we show
+that precise placement of the double dot relative to the nanomagnet allows to
+select between a purely longitudinal coupling (commuting with the bare spin
+Hamiltonian) and a purely transverse (spin non-conserving) coupling.
+Additionally, we suggest methods to mitigate dephasing and relaxation channels
+that are introduced in this coupling scheme. This analysis gives a clear route
+toward the realization of coherent state transfer between a microwave resonator
+and a single electron spin in a GaAs double quantum dot with a fidelity above
+90%. Improved dynamical decoupling sequences, low-noise environments, and
+longer-lived microwave cavity modes may lead to substantially higher fidelities
+in the near future.",1606.04736v3
+2007-09-16,Orbital-quenching-induced magnetism in Ba_2NaOsO_6,"The double perovskite \bnoo with heptavalent Os ($d^1$) is observed to remain
+in the ideal cubic structure ({\it i.e.} without orbital ordering) despite
+single occupation of the $t_{2g}$ orbitals, even in the ferromagnetically
+ordered phase below 6.8 K. Analysis based on the {\it ab initio} dispersion
+expressed in terms of an Os $t_{2g}$-based Wannier function picture, spin-orbit
+coupling, Hund's coupling, and strong Coulomb repulsion shows that the magnetic
+OsO$_6$ cluster is near a moment-less condition due to spin and orbital
+compensation. Quenching (hybridization) then drives the emergence of the small
+moment. This compensation, unprecedented in transition metals, arises in a
+unified picture that accounts for the observed Mott insulating behavior.",0709.2520v1
+2024-02-24,Role of strong correlation and spin-orbit coupling in $\textrm{LuB}_{4}$: a first principle study,"The recent observation of magnetization plateaus in rare-earth metallic
+tetraborides has drawn a lot of attention to this class of materials. In this
+work, we investigate the electronic structure of one such canonical system
+$\textrm{LuB}_{4}$, using first-principle density functional theory, together
+with strong Coulomb correlation and spin-orbit coupling (SOC) effects. The
+electronic band structures show that $\textrm{LuB}_{4}$ is a non-magnetic
+correlated metal with completely filled $4f$ shell. The projected density of
+states (DOS) shows a continuum at the Fermi level (FL), arising mainly from
+hybridized Lu $d$ and B $p$ orbitals, along with some discrete peaks, well
+separated from the continuum. These peaks arise mainly due to core-level Lu
+$s$, $p$ and $4f$ atomic orbitals. Upon inclusion of SOC, the discrete peak
+arising due to Lu $p$ is split into two peaks with $j = 1/2$, $j = 3/2$ while
+the peak arising due to Lu $4f$ orbitals splits into two peaks with $j = 5/2$
+and $j = 7/2$. These peaks will give rise to multiplet structure in core level
+X-ray photo-emission spectroscopy. Inclusion of strong correlation effects
+pushes the Lu $4f$ peak away from the FL while the qualitative features remain
+intact.",2402.15822v1
+2001-01-23,Spin versus Lattice Polaron: Prediction for Electron-Doped CaMnO3,"CaMnO3 is a simple bi-partite antiferromagnet(AF) which can be continuously
+electron-doped up to LaMnO3. Electrons enter the doubly degenerate E_g subshell
+with spins aligned to the S=3/2 core of Mn^4+ (T_2g^3)$. We take the Hubbard
+and Hund energies to be effectively infinite. Our model Hamiltonian has two E_g
+orbitals per Mn atom, nearest neighbor hopping, nearest neighbor exchange
+coupling of the S=3/2 cores, and electron-phonon coupling of Mn orbitals to
+adjacent oxygen atoms. We solve this model for light doping. Electrons are
+confined in local ferromagnetic (FM) regions (spin polarons) where there
+proceeds an interesting competition between spin polarization (spin polarons)
+which enlarges the polaron, and lattice polarization (Jahn-Teller polarons)
+which makes it smaller. A symmetric 7-atom ferromagnetic cluster (Mn_7^27+) is
+the stable result, with net spin S=2 relative to the undoped AF. The distorted
+oxygen positions around the electron are predicted. The model also predicts a
+critical doping x_c=0.045 where the polaronic insulator becomes unstable
+relative to a FM metal.",0101354v1
+2002-04-30,Rashba spin-orbit interaction and shot noise for spin-polarized and entangled electrons,"We study shot noise for spin-polarized currents and entangled electron pairs
+in a four-probe (beam splitter) geometry with a local Rashba spin-orbit (s-o)
+interaction in the incoming leads. Within the scattering formalism we find that
+shot noise exhibits Rashba-induced oscillations with continuous bunching and
+antibunching. We show that entangled states and triplet states can be
+identified via their Rashba phase in noise measurements. For two-channel leads
+we find an additional spin rotation due to s-o induced interband coupling which
+provides enhanced spin control. We show that the s-o interaction determines the
+Fano factor which provides a direct way to measure the Rashba coupling constant
+via noise.",0204639v2
+2004-05-04,Spin Accumulation and Equilibrium Currents at the Edge of 2DEGs with Spin-Orbit Coupling,"We show that in a two dimensional electron gas (2DEG) the interplay between
+the Rashba spin-orbit coupling and a potential barrier (eg., the sample edge)
+generates interesting spin effects. In the presence of an external charge
+current, a spin accumulation is built up near the barrier while in equilibrium
+there is an inhomogeneous spin current which is localized at the barrier and
+flows parallel to it. When an in-plane magnetic field perpendicular to the
+barrier is applied, the system also develops an inhomogeneous charge current
+density. These effects originate purely from the structure of the eigenstates
+near the boundary.",0405065v3
+2004-05-09,Spin susceptibility in superconductors without inversion symmetry,"In materials without spatial inversion symmetry the spin degeneracy of the
+conduction electrons can be lifted by an antisymmetric spin-orbit coupling. We
+discuss the influence of this spin-orbit coupling on the spin susceptibility of
+such superconductors, with a particular emphasis on the recently discovered
+heavy Fermion superconductor CePt3Si. We find that, for this compound (with
+tetragonal crystal symmetry,) irrespective of the pairing symmetry, the stable
+superconducting phases would give a very weak change of the spin susceptibility
+for fields along the c-axis and an intermediate reduction for fields in the
+basal plane. We also comment on the consequences for the paramagnetic limiting
+in this material.",0405179v2
+2004-11-27,A Theoretical Investigation of Relativistic Spintronics,"Spintronics directly based on relativistic quantum mechanics is called as
+relativistic spintronics, which involves the study of active control and
+manipulation of 4D spin-tensor degrees of freedom via the electromagnetic field
+tensor. For future potential electronic devices with smaller size, the study of
+relativistic spintronics would be valuable. In this paper, we try to establish
+a general theoretical basis for relativistic spintronics, from which we have:
+1) in relativistic spintronics, there have more plentiful contents for
+relativistic effects, e.g. the usual 3D spatial spin-orbit coupling is extended
+to the 4D spin-orbit-tensor coupling; 2) via the spin and like-spin degrees of
+freedom we can simultaneously make use of electric and magnetic field strengths
+to orientate an electron; 3) not only the spin quantum states of a moving
+electron but also those of a motionless electron can be affected by some
+particular electrostatic fields.",0411689v1
+2005-02-19,Orbital ac spin-Hall effect in the hopping regime,"The Rashba and Dresselhaus spin-orbit interactions are both shown to yield
+the low temperature spin-Hall effect for strongly localized electrons coupled
+to phonons. A frequency-dependent electric field ${\bf E}(\omega)$ generates a
+spin-polarization current, normal to ${\bf E}$, due to interference of hopping
+paths. At zero temperature the corresponding spin-Hall conductivity is real and
+is proportional to $\omega^{2}$. At non-zero temperatures the coupling to the
+phonons yields an imaginary term proportional to $\omega$. The interference
+also yields persistent spin currents at thermal equilibrium, at ${\bf E}=0$.
+The contributions from the Dresselhaus and Rashba interactions to the
+interference oppose each other.",0502478v1
+2005-12-21,Integer Spin Hall Effect in Ballistic Quantum Wires,"We investigate the ballistic electron transport in a two dimensional Quantum
+Wire under the action of an electric field ($E_y$). We demonstrate how the
+presence of a Spin Orbit coupling, due to the uniform electric confinement
+field gives a non-commutative effect as in the presence of a transverse
+magnetic field.
+  We discuss how the non commutation implies an edge localization of the
+currents depending on the electron spins also giving a semi-classical spin
+dependent Hall current.
+  We also discuss how it is possible obtain a quantized Spin Hall conductance
+in the ballistic transport regime by developing the Landauer formalism and show
+the coupling between the spin magnetic momentum and the orbital one due to the
+presence of a circulating current.",0512543v1
+2005-12-23,S-wave/spin-triplet order in superconductors without inversion symmetry: Li$_2$Pd$_3$B and Li$_2$Pt$_3$B,"We investigate the order parameter of noncentrosymmetric superconductors
+Li$_2$Pd$_3$B and Li$_2$Pt$_3$B via the behavior of the penetration depth
+$\lambda(T)$. The low-temperature penetration depth shows BCS-like behavior in
+Li$_2$Pd$_3$B, while in Li$_2$Pt$_3$B it follows a linear temperature
+dependence. We propose that broken inversion symmetry and the accompanying
+antisymmetric spin-orbit coupling, which admix spin-singlet and spin-triplet
+pairing, are responsible for this behavior. The triplet contribution is weak in
+Li$_2$Pd$_3$B, leading to a wholly open but anisotropic gap. The significantly
+larger spin-orbit coupling in Li$_2$Pt$_3$B allows the spin-triplet component
+to be larger in Li$_2$Pt$_3$B, producing line nodes in the energy gap as
+evidenced by the linear temperature dependence of $\lambda(T)$. The
+experimental data are in quantitative agreement with theory.",0512601v2
+2006-05-09,Dimensional Control of Antilocalisation and Spin Relaxation in Quantum Wires,"The spin relaxation rate $1/\tau_s (W)$ in disordered quantum wires with
+Rashba and Dresselhaus spin-orbit coupling is derived analytically as a
+function of wire width $W$. It is found to be diminished when $W$ is smaller
+than the bulk spin-orbit length $L_{\rm SO}$. Only a small spin relaxation rate
+due to cubic Dresselhaus coupling $\gamma$ is found to remain in this limit. As
+a result, when reducing the wire width $W$ the quantum conductivity correction
+changes from weak anti- to weak localization and from negative to positive
+magnetoconductivity.",0605243v4
+2007-02-24,Disorder Enhanced Spin Polarization in Diluted Magnetic Semiconductors,"We present a theoretical study of diluted magnetic semiconductors that
+includes spin-orbit coupling within a realistic host band structure and treats
+explicitly the effects of disorder due to randomly substituted Mn ions. While
+spin-orbit coupling reduces the spin polarization by mixing different spin
+states in the valence bands, we find that disorder from Mn ions enhances the
+spin polarization due to formation of ferromagnetic impurity clusters and
+impurity bound states. The disorder leads to large effects on the hole carriers
+which form impurity bands as well as hybridizing with the valence band. For Mn
+doping 0.01 < x < 0.04, the system is metallic with a large effective mass and
+low mobility.",0702567v1
+2009-06-08,"Electronic properties of graphene and graphene nanoribbons with ""pseudo-Rashba"" spin-orbit coupling","We discuss the electronic properties of graphene and graphene nanoribbons
+including ""pseudo-Rashba"" spin-orbit coupling. After summarizing the bulk
+properties, we first analyze the scattering behavior close to an infinite mass
+and zigzag boundary. For low energies, we observe strong deviations from the
+usual spin-conserving behavior at high energies such as reflection acting as
+spin polarizer or switch. This results in a spin polarization along the
+direction of the boundary due to the appearance of evanescent modes in the case
+of non-equilibrium or when there is no coherence between the two one-particle
+branches. We then discuss the spin and density distribution of graphene
+nanoribbons.",0906.1371v2
+2009-06-09,Giant spin rotation under quasiparticle-photoelectron conversion: Joint effect of sublattice interference and spin-orbit coupling,"Spin- and angular-resolved photoemission spectroscopy is a basic experimental
+tool for unveiling spin polarization of electron eigenstates in crystals. We
+prove, by using spin-orbit coupled graphene as a model, that photoconversion of
+a quasiparticle inside a crystal into a photoelectron can be accompanied with a
+dramatic change in its spin polarization, up to a total spin flip. This
+phenomenon is typical of quasiparticles residing away from the Brillouin zone
+center and described by higher rank spinors, and results in exotic patterns in
+the angular distribution of photoelectrons.",0906.1812v2
+2009-09-24,Spin-orbit coupling in the metallic and spin-liquid phases of Na4Ir3O8,"It has recently been proposed that Na4Ir3O8 is a weak Mott insulator at
+ambient pressure, supporting a three-dimensional spin liquid phase with a
+spinon Fermi surface. This proposal is consistent with recent experimental
+findings that the material becomes a metal upon increasing pressure or doping.
+In this work, we investigate the effect of the spin-orbit coupling arising from
+5d Ir moments both in the metallic and spin liquid phases of Na4Ir3O8. The
+effective Hubbard model in terms of pseudospin j=1/2 Ir states is derived and
+its consequences to both metallic and spin liquid phases are studied. In
+particular, the model leads to enhanced Wilson ratio and strong temperature
+dependence of the Hall coefficient.",0909.4546v2
+2009-10-01,Spin relaxation due to random Rashba spin-orbit coupling in GaAs (110) quantum wells,"We investigate the spin relaxation due to the random Rashba spin-orbit
+coupling in symmetric GaAs (110) quantum wells from the fully microscopic
+kinetic spin Bloch equation approach. All relevant scatterings, such as the
+electron-impurity, electron--longitudinal-optical-phonon,
+electron--acoustic-phonon, as well as electron-electron Coulomb scatterings are
+explicitly included. It is shown that our calculation reproduces the
+experimental data by M\""uller {\em et al.} [Phys. Rev. Lett. {\bf 101}, 206601
+(2008)] for a reasonable choice of parameter values. We also predict that the
+temperature dependence of spin relaxation time presents a peak in the case with
+low impurity density, which originates from the electron-electron Coulomb
+scattering.",0910.0066v2
+2011-05-31,Topological Insulators and Quantum Spin Liquids,"In this paper we review some connections recently discovered between
+topological insulators and certain classes of quantum spin liquids, focusing on
+two and three spatial dimensions. In two dimensions we show the integer quantum
+Hall effect plays a key role in relating topological insulators and chiral spin
+liquids described by fermionic excitations, and we describe a procedure for
+""generating"" a certain class of topological states. In three dimensions we
+discuss interesting relationships between certain quantum spin liquids and
+interacting ""exotic"" variants of topological insulators. We focus attention on
+better understanding interactions in topological insulators, and the phases
+nearby in parameter space that might result from moderate to strong
+interactions in the presence of strong spin-orbit coupling. We stress that
+oxides with heavy transition metal ions, which often host a competition between
+electron interactions and spin-orbit coupling, are an excellent place to search
+for unusual topological phenomena and other unconventional phases.",1106.0013v2
+2013-07-16,Nonequilibrium spin noise spectroscopy,"Spin Noise Spectroscopy (SNS) is an experimental approach to obtain
+correlators of mesoscopic spin fluctuations in time by purely optical means. We
+explore the information that this technique can provide when it is applied to a
+weakly non-equilibrium regime when an electric current is driven through a
+sample by an electric field. We find that the noise power spectrum of
+conducting electrons experiences a shift, which is proportional to the strength
+of the spin-orbit coupling for electrons moving along the electric field
+direction. We propose applications of this effect to measurements of spin orbit
+coupling anisotropy and separation of spin noise of conducting and localized
+electrons.",1307.4426v1
+2014-04-08,Spin-singlet superconductivity with a full gap in locally non-centrosymmetric SrPtAs,"We report $^{195}$Pt-NMR and $^{75}$As-NQR measurements for the locally
+non-centrosymmetric superconductor SrPtAs where the As-Pt layer breaks
+inversion symmetry while globally the compound is centrosymmetric. The nuclear
+spin lattice relaxation rate $1/T_1$ shows a well-defined coherence peak below
+$T_c$ and decreases exponentially at low temperatures. The spin susceptibility
+measured by the Knight shift also decreases below $T_c$ down to $T<T_c/6$.
+These data together with the penetration depth obtained from the NMR spectra
+can be consistently explained by assuming a spin-singlet superconducting state
+with a full gap. Our results suggest that the spin-orbit coupling due to the
+local inversion-breaking is not large enough to bring about an exotic
+superconducting state, or the inter-layer hopping interaction is larger than
+the spin-orbit coupling.",1404.2154v1
+2014-10-23,Ultrafast single electron spin manipulation in 2D semiconductor quantum dots with optimally controlled time-dependent electric fields through spin-orbit coupling,"We have studied theoretically the possibility of ultra-fast manipulation of a
+single electron spin in 2D semiconductor quantum dots, by means of
+high-frequency time-dependent electric fields. The electron spin degree of
+freedom is excited through spin-orbit coupling, and the procedure may be
+enhanced by the presence of a static magnetic field. We use quantum optimal
+control theory to tailor the temporal profile of the electric field in order to
+achieve the most effective manipulation. The scheme predicts significant
+control over spin operations in times of the order of picoseconds -- an
+ultrafast time scale that permits to avoid the effects of decoherence if this
+scheme is to be used as a tool for quantum information processing.",1410.6344v1
+2014-11-19,Seebeck effects in two-dimensional spin transistors,"We consider a spin-orbit-coupled two-dimensional electron system under the
+influence of a thermal gradient externally applied to two attached reservoirs.
+We discuss the generated voltage bias (charge Seebeck effect), spin bias (spin
+Seebeck effect) and magnetization-dependent thermopower (magneto-Seebeck
+effect) in the ballistic regime of transport at linear response. We find that
+the charge thermopower is an oscillating function of both the spin-orbit
+strength and the quantum well width. We also observe that it is always negative
+for normal leads. We carefully compare the exact results for the linear
+response coefficients and a Sommerfeld approximation. When the contacts are
+ferromagnetic, we calculate the spin-resolved Seebeck coefficient for parallel
+and antiparallel magnetization configuration. Remarkably, the thermopower can
+change its sign by tuning the Fermi energy. This effect disappears when the
+Rashba coupling is absent. Additionally, we determine the magneto-Seebeck
+ratio, which shows dramatic changes in the presence of a the Rashba potential.",1411.5138v2
+2015-06-08,Helical Majorana fermions in d_{x^2-y^2} + i d_{xy}-wave topological superconductivity of doped correlated quantum spin Hall insulators,"Large Hubbard U limit of the Kane-Mele model on a zigzag ribbon of honeycomb
+lattice near half-filling is studied via a renormalized mean-field theory. The
+ground state exhibits time-reversal symmetry (TRS) breaking d + i d'-wave
+superconductivity. At large spin-orbit coupling, the Z2 phase with non-trivial
+spin Chern number in the pure Kane-Mele model is persistent into the TRS broken
+state (called spin-Chern phase), and has two pairs of counter-propagating
+helical Majorana modes at the edges. As the spin-orbit coupling is reduced, the
+system undergoes a topological quantum phase transition from the spin-Chern to
+chiral superconducting states. Possible relevance of our results to
+adatom-doped graphene and irridate compounds is discussed.",1506.02584v1
+2016-07-08,Semiclassical ground-state phase diagram and multi-Q phase of a spin-orbit coupled model on triangular lattice,"Motivated by recent experiments on the frustrated quantum magnetic compound
+YbMgGaO4, we study an effective spin model on triangular lattice taking into
+account the effects of the spin-orbit coupling. We determine the classical
+ground-state phase diagram of this model, which includes a 120 degree Neel and
+two collinear antiferromagnetic phases. In the vicinity of the phase boundary
+between the Neel and collinear phases, we identify three intermediate
+non-collinear antiferromagnetic phases. In each of them the magnetic moments
+are ordered at multiple incommensurate wave vector Q values. We further study
+the effects of quantum fluctuations in this model via a linear spin-wave
+theory. We find that the spin excitation gap of the non-collinear multi-Q
+antiferromagnetic state is finite but can be vanishingly small, and this state
+is unstable to a spin liquid phase under strong quantum fluctuations in some
+large J_{z+-} regime.",1607.02295v1
+2016-07-08,Supercurrent-induced Skyrmion dynamics and Tunable Weyl points in Chiral Magnet with Superconductivity,"Recent studies show superconductivity provides new perspectives on
+spintronics. We study a heterostructure composed of an s-wave superconductor
+and a cubic chiral-magnet that can stabilize a topological spin texture, a
+skyrmion. We propose a supercurrent-induced spin torque that originates from
+the spin-orbit coupling, and we show that the spin torque can drive a skyrmion
+in an efficient way that reduces Joule heating. We also study the band
+structure of Bogoliubov quasiparticles and show the existence of Weyl points,
+whose positions can be controlled by the direction of the magnetization. This
+results in an effective magnetic field acting on the quasiparticles in the
+presence spin textures. Furthermore, the tilt of the Weyl cones can also be
+tuned by the strength of the spin-orbit coupling, and we propose a possible
+realization of type-II Weyl points.",1607.02336v4
+2016-10-07,Spin blockade as a probe of Zeeman interactions in hole quantum dots,"Spin-orbit coupling is key to all-electrical control of quantum-dot spin
+qubits, and is frequently stronger for holes than for electrons. Here we
+investigate Pauli spin blockade for two heavy holes in a gated double quantum
+dot in an in-plane magnetic field. The interplay of the complex Zeeman and
+spin-orbit couplings causes a blockade leakage current anisotropic in the field
+direction. The period of the anisotropic leakage is critically dependent on the
+relative magnitude of Zeeman interaction terms linear and cubic in the magnetic
+field. The current and singlet-triplet exchange splitting can be effectively
+adjusted by an appropriate choice of field direction, providing a simple
+control variable for quantum information processing and a way of tailoring
+magnetic interactions in hole spin qubits.",1610.02119v1
+2018-11-11,Closed-form weak localization magnetoconductivity in quantum wells with arbitrary Rashba and Dresselhaus spin-orbit interactions,"We derive a closed-form expression for the weak localization (WL) corrections
+to the magnetoconductivity of a 2D electron system with arbitrary Rashba
+$\alpha$ and Dresselhaus $\beta$ (linear) and $\beta_3$ (cubic) spin-orbit
+interaction couplings, in a perpendicular magnetic field geometry. In a system
+of reference with an in-plane $\hat{z}$ axis chosen as the high spin-symmetry
+direction at $\alpha = \beta$, we formulate a new algorithm to calculate the
+three independent contributions that lead to WL. The antilocalization is
+counterbalanced by the term associated with the spin-relaxation along
+$\hat{z}$, dependent only on $\alpha - \beta$. The other term is generated by
+two identical scattering modes characterized by spin-relaxation rates which are
+explicit functions of the orientation of the scattered momentum. Excellent
+agreement is found with data from GaAs quantum wells, where in particular our
+theory correctly captures the shift of the minima of the WL curves as a
+function of $\alpha/\beta$. This suggests that the anisotropy of the effective
+spin relaxation rates is fundamental to understanding the effect of the SO
+coupling in transport.",1811.04488v1
+2010-05-26,Phase Transitions in Dissipative Quantum Transport and Mesoscopic Nuclear Spin Pumping,"Topological phase transitions can occur in the dissipative dynamics of a
+quantum system when the ratio of matrix elements for competing transport
+channels is varied. Here we establish a relation between such behavior in a
+class of non-Hermitian quantum walk problems [M. S. Rudner and L. S. Levitov,
+Phys. Rev. Lett. 102, 065703 (2009)] and nuclear spin pumping in double quantum
+dots, which is mediated by the decay of a spin-blockaded electron triplet state
+in the presence of spin-orbit and hyperfine interactions. The transition occurs
+when the strength of spin-orbit coupling exceeds the strength of the net
+hyperfine coupling, and results in the complete suppression of nuclear spin
+pumping. Below the transition point, nuclear pumping is accompanied by a strong
+reduction in current due to the presence of non-decaying ""dark states"" in this
+regime. Due to its topological character, the transition is expected to be
+robust against dephasing of the electronic degrees of freedom.",1005.4809v1
+2016-11-29,Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces,"Spin-orbit coupling (SOC) describes the relativistic interaction between the
+spin and momentum degrees of freedom of electrons, and is central to the rich
+phenomena observed in condensed matter systems. In recent years, new phases of
+matter have emerged from the interplay between SOC and low dimensionality, such
+as chiral spin textures and spin-polarized surface and interface states. These
+low-dimensional SOC-based realizations are typically robust and can be
+exploited at room temperature. Here we discuss SOC as a means of producing such
+fundamentally new physical phenomena in thin films and heterostructures. We put
+into context the technological promise of these material classes for developing
+spin-based device applications at room temperature.",1611.09521v1
+2018-05-15,Spin-orbit coupling and electric-dipole spin resonance in a nanowire double quantum dot,"We study the electric-dipole transitions for a single electron in a double
+quantum dot located in a semiconductor nanowire. Enabled by spin-orbit coupling
+(SOC), electric-dipole spin resonance (EDSR) for such an electron can be
+generated via two mechanisms: the SOC-induced intradot pseudospin states mixing
+and the interdot spin-flipped tunneling. The EDSR frequency and strength are
+determined by these mechanisms together. For both mechanisms the
+electric-dipole transition rates are strongly dependent on the external
+magnetic field. Their competition can be revealed by increasing the magnetic
+field and/or the interdot distance for the double dot. To clarify whether the
+strong SOC significantly impact the electron state coherence, we also calculate
+relaxations from excited levels via phonon emission. We show that spin-flip
+relaxations can be effectively suppressed by the phonon bottleneck effect even
+at relatively low magnetic fields because of the very large $g$-factor of
+strong SOC materials such as InSb.",1805.05541v1
+2016-08-17,Ultrafast spin-flip dynamics in transition metal complexes triggered by soft X-ray light,"Recent advances in attosecond physics provide access to the correlated motion
+of valence and core electrons on their intrinsic timescales. For valence
+excitations, processes related to the electron spin are usually driven by
+nuclear motion. For core-excited states, where the core hole has a nonzero
+angular momentum, spin-orbit coupling is strong enough to drive spin-flips on a
+much shorter time scale. Here, unprecedented short spin-crossover driven by
+spin-orbit coupling is demonstrated for L-edge (2p$\rightarrow$3d) excited
+states of a prototypical Fe(II) complex. It occurs on a time scale, which is
+faster than the core hole lifetime of about 4~fs. A detailed analysis of such
+phenomena will",1608.04979v1
+2017-10-02,Nonlocal Andreev Entanglements and Triplet Correlations in Graphene with Spin Orbit Coupling,"Using a wavefunction Dirac Bogoliubov-de Gennes method, we demonstrate that
+the tunable Fermi level of a graphene layer in the presence of Rashba spin
+orbit coupling (RSOC) allows for producing an anomalous nonlocal Andreev
+reflection and equal spin superconducting triplet pairing. We consider a
+graphene junction of a ferromagnet-RSOC-superconductor-ferromagnet
+configuration and study scattering processes, the appearance of spin triplet
+correlations, and charge conductance in this structure. We show that the
+anomalous crossed Andreev reflection is linked to the equal spin triplet
+pairing. Moreover, by calculating current cross-correlations, our results
+reveal that this phenomenon causes negative charge conductance at weak voltages
+and can be revealed in a spectroscopy experiment, and may provide a tool for
+detecting the entanglement of the equal spin superconducting pair correlations
+in hybrid structures.",1710.00840v2
+2018-01-27,Ubiquitous Ideal Spin-Orbit Coupling in a Screw Dislocation in Semiconductors,"We theoretically demonstrate that screw dislocation (SD), a 1D topological
+defect widely present in semiconductors, exhibits ubiquitously a new form of
+spin-orbit coupling (SOC) effect. Differing from the widely known conventional
+2D Rashba-Dresselhaus (RD) SOC effect that typically exists at
+surfaces/interfaces, the deep-level nature of SD-SOC states in semiconductors
+readily makes it an ideal SOC. Remarkably, the spin texture of 1D SD-SOC,
+pertaining to the inherent symmetry of SD, exhibits a significantly higher
+degree of spin coherency than the 2D RD-SOC. Moreover, the 1D SD-SOC can be
+tuned by ionicity in compound semiconductors to ideally suppress spin
+relaxation, as demonstrated by comparative first-principles calculations of SDs
+in Si/Ge, GaAs, and SiC. Our findings therefore open a new door to manipulating
+spin transport in semiconductors by taking advantage of an otherwise
+detrimental topological defect.",1801.09025v1
+2018-01-29,First-Principles Evaluation of the Dzyaloshinskii--Moriya Interaction,"We review recent developments of formulations to calculate the
+Dzyaloshinskii--Moriya (DM) interaction from first principles. In particular,
+we focus on three approaches. The first one evaluates the energy change due to
+the spin twisting by directly calculating the helical spin structure. The
+second one employs the spin gauge field technique to perform the derivative
+expansion with respect to the magnetic moment. This gives a clear picture that
+the DM interaction can be represented as the spin current in the equilibrium
+within the first order of the spin-orbit couplings. The third one is the
+perturbation expansion with respect to the exchange couplings and can be
+understood as the extension of the Ruderman--Kittel--Kasuya--Yosida (RKKY)
+interaction to the noncentrosymmetric spin-orbit systems. By calculating the DM
+interaction for the typical chiral ferromagnets Mn$_{1-x}$Fe$_x$Ge and
+Fe$_{1-x}$Co$_x$Ge, we discuss how these approaches work in actual systems.",1801.09439v1
+2019-10-16,Acoustic spin-Chern insulator induced by synthetic spin-orbit coupling with spin conservation breaking,"Topologically protected surface modes of classical waves hold the promise to
+enable a variety of applications ranging from robust transport of energy to
+reliable information processing networks. The integer quantum Hall effect has
+delivered on that promise in the electronic realm through high-precision
+metrology devices. However, both the route of implementing an analogue of the
+quantum Hall effect as well as the quantum spin Hall effect are obstructed for
+acoustics by the requirement of a magnetic field, or the presence of fermionic
+quantum statistics, respectively. Here, we use a two-dimensional acoustic
+crystal with two layers to mimic spin-orbit coupling, a crucial ingredient of
+topological insulators. In particular, our setup allows us to free ourselves of
+symmetry constraints as we rely on the concept of a non-vanishing ""spin"" Chern
+number. We experimentally characterize the emerging boundary states which we
+show to be gapless and helical. Moreover, in an H-shaped device we demonstrate
+how the transport path can be selected by tuning the geometry, enabling the
+construction of complex networks.",1910.07196v1
+2021-01-13,Interplay between friction and spin-orbit coupling as a source of spin polarization,"We study an effective one-dimensional quantum model that includes friction
+and spin-orbit coupling (SOC), and show that the model exhibits spin
+polarization when both terms are finite. Most important, strong spin
+polarization can be observed even for moderate SOC, provided that friction is
+strong. Our findings might help to explain the pronounced effect of chirality
+on spin distribution and transport in chiral molecules. In particular, our
+model implies static magnetic properties of a chiral molecule, which lead to
+Shiba-like states when a molecule is placed on a superconductor, in accordance
+with recent experimental data.",2101.05173v3
+2017-09-18,Tunable Anomalous Andreev Reflection and Triplet Pairings in Spin Orbit Coupled Graphene,"We theoretically study scattering process and superconducting triplet
+correlations in a graphene junction comprised of ferromagnet-RSO-superconductor
+in which RSO stands for a region with Rashba spin orbit interaction. Our
+results reveal spin-polarized subgap transport through the system due to an
+anomalous equal-spin Andreev reflection in addition to conventional back
+scatterings. We calculate equal- and opposite-spin pair correlations near the
+F-RSO interface and demonstrate direct link of the anomalous Andreev reflection
+and equal-spin pairings arised due to the proximity effect in the presence of
+RSO interaction. Moreover, we show that the amplitude of anomalous Andreev
+reflection, and thus the triplet pairings, are experimentally controllable when
+incorporating the influences of both tunable strain and Fermi level in the
+nonsuperconducting region. Our findings can be confirmed by a conductance
+spectroscopy experiment and provide better insights into the proximity-induced
+RSO coupling in graphene layers reported in recent experiments.",1709.06150v2
+2017-11-07,Room temperature magneto-optic effect in silicon light-emitting diodes,"In weakly spin-orbit coupled materials, the spin-selective nature of
+recombination can give rise to large magnetic-field effects, for example on
+electro-luminescence from molecular semiconductors. While silicon has weak
+spin-orbit coupling, observing spin-dependent recombination through
+magneto-electroluminescence is challenging due to the inefficiency of emission
+due to silicon's indirect band-gap, and to the difficulty in separating
+spin-dependent phenomena from classical magneto-resistance effects. Here we
+overcome these challenges to measure magneto-electroluminescence in silicon
+light-emitting diodes fabricated via gas immersion laser doping. These devices
+allow us to achieve efficient emission while retaining a well-defined geometry
+thus suppressing classical magnetoresistance effects to a few percent. We find
+that electroluminescence can be enhanced by up to 300\% near room temperature
+in a seven Tesla magnetic field showing that the control of the spin degree of
+freedom can have a strong impact on the efficiency of silicon LEDs.",1711.02451v1
+2018-06-19,Evidence for a quantum-spin-Hall phase in graphene decorated with Bi2Te3 nanoparticles,"Realization of the quantum-spin-Hall effect in graphene devices has remained
+an outstanding challenge dating back to the inception of the field of
+topological insulators. Graphene's exceptionally weak spin-orbit coupling
+-stemming from carbon's low mass- poses the primary obstacle. We experimentally
+and theoretically study artificially enhanced spin-orbit coupling in graphene
+via random decoration with dilute Bi2Te3 nanoparticles. Remarkably,
+multi-terminal resistance measurements suggest the presence of helical edge
+states characteristic of a quantum-spin-Hall phase; the magnetic-field and
+temperature dependence of the resistance peaks, X-ray photoelectron spectra,
+scanning tunneling spectroscopy, and first-principles calculations further
+support this scenario. These observations highlight a pathway to spintronics
+and quantum-information applications in graphene-based quantum-spin-Hall
+platforms.",1806.07027v4
+2019-02-17,Experimental realization of a non-magnetic one-way spin switch,"Controlling magnetism through non-magnetic means is highly desirable for
+future electronic devices, as such means typically have ultra-low power
+requirements and can provide coherent control. In recent years, great
+experimental progress has been made in the field of electrical manipulation of
+magnetism in numerous material systems. These studies generally do not consider
+the directionality of the applied non-magnetic potentials and/or magnetism
+switching. Here, we theoretically conceive and experimentally demonstrate a
+non-magnetic one-way spin switch device using a spin-orbit coupled
+Bose-Einstein condensate subjected to a moving spin-independent dipole
+potential. The physical foundation of this unidirectional device is based on
+the breakdown of Galilean invariance in the presence of spin-orbit coupling.
+Such a one-way spin switch opens an avenue for designing novel quantum devices
+with unique functionalities and may facilitate further experimental
+investigations of other one-way spintronic and atomtronic devices.",1902.06321v1
+2019-02-25,Spin-orbit-induced hole spin relaxation in a quantum dot molecule: the effect of $s$-$p$ coupling,"We study the effect of the coupling between the hole $s$ shell of one quantum
+dot and the $p$ shell in the other dot forming a quantum dot molecule on the
+spin relaxation between the sublevels of the hole $s$ state. Using an effective
+model that captures the spin-orbit effects in the $p$ shell irrespective of
+their origin, we show that the strong spin mixing in the $p$ shell can be
+transferred to the $s$ shell of the other dot, leading to enhanced spin
+relaxation in a certain energy range around the $s$-$p$ resonance if the dots
+are misaligned and the magnetic field is tilted from the sample plane.",1902.09161v1
+2019-04-19,A microscopic description for polarization in particle scatterings,"We propose a microscopic description for the polarization from the first
+principle through the spin-orbit coupling in particle collisions. The model is
+different from previous ones based on local equilibrium assumptions for the
+spin degree of freedom. It is based on scatterings of particles as wave
+packets, an effective method to deal with particle scatterings at specified
+impact parameters. The polarization is then the consequence of particle
+collisions in a non-equilibrium state of spins. The spin-vorticity coupling
+naturally emerges from the spin-orbit one encoded in polarized scattering
+amplitudes of collisional integrals when one assumes local equilibrium in
+momentum but not in spin.",1904.09152v1
+2021-04-28,Spin and anomalous Hall effects emerging from topological degeneracy in Dirac fermion system CuMnAs,"Orthorhombic CuMnAs has been proposed as an antiferromagnetic semimetal
+hosting nodal line and Dirac points around the Fermi level. We investigate
+relations between the topological bands and transport phenomena, i.e. spin Hall
+effect and anomalous Hall effect, in orthorhombic CuMnAs with first-principles
+calculations combined with symmetry analysis of magnetic structures and of
+(spin) Berry curvature. We show the nodal line gapped with spin-orbit coupling
+in CuMnAs dominantly generates large spin Hall conductivity in the ground
+state. Although the magnetic symmetry in the ground state of CuMnAs forbids the
+finite anomalous Hall effect, applied magnetic fields produce a significant
+anomalous component of the Hall conductivity with the magnetic symmetry
+breaking. We identify that the dominant contribution to anomalous Hall
+components comes from further lifting of band degeneracy under external
+magnetic fields for the Bloch states generated with splitting of nodal lines by
+spin-orbit coupling near Fermi energy.",2104.13704v1
+2021-07-06,Spin-valley Silin modes in graphene with substrate-induced spin-orbit coupling,"In the presence of external magnetic field the Fermi-liquid state supports
+oscillatory spin modes known as Silin modes. We predict the existence of the
+generalized Silin modes in a multivalley system, monolayer graphene. A gauge-
+and Berry-gauge- invariant kinetic equation for a multivalley Fermi liquid is
+developed and applied to the case of graphene with extrinsic spin-orbit
+coupling (SOC). The interplay of SOC and Berry curvature allows for the
+excitation of generalized Silin modes in the spin and valley-staggered-spin
+channels via an AC electric field. The resonant contributions from these modes
+to the optical conductivity are calculated.",2107.02819v1
+2021-09-15,Lasing in the Rashba-Dresselhaus spin-orbit coupling regime in a dye-filled liquid crystal optical microcavity,"In the presence of Rashba-Dresselhaus coupling, strong spin-orbit
+interactions in liquid crystal optical cavities result in a distinctive
+spin-split entangled dispersion. Spin coherence between such modes give rise to
+an optical persistent-spin-helix. In this letter, we introduce optical gain in
+such a system, by dispersing a molecular dye in a liquid-crystal microcavity.
+We demonstrate both lasing in the Rashba-Dresselhaus regime and the emergence
+of an optical persistent spin helix.",2109.07338v1
+2022-03-01,turboMagnon -- A code for the simulation of spin-wave spectra using the Liouville-Lanczos approach to time-dependent density-functional perturbation theory,"We introduce turboMagnon, an implementation of the Liouville-Lanczos approach
+to linearized time-dependent density-functional theory, designed to simulate
+spin-wave spectra in solid-state materials. The code is based on the
+noncollinear spin-polarized framework and the self-consistent inclusion of
+spin-orbit coupling that allow to model complex magnetic excitations. The spin
+susceptibility matrix is computed using the Lanczos recursion algorithm that is
+implemented in two flavors - the non-Hermitian and the pseudo-Hermitian one.
+turboMagnon is open-source software distributed under the terms of the GPL as a
+component of Quantum ESPRESSO. As with other components, turboMagnon is
+optimized to run on massively parallel architectures using native mathematical
+libraries (LAPACK and FFTW) and a hierarchy of custom parallelization layers
+built on top of MPI. The effectiveness of the code is showcased by computing
+magnon dispersions for the CrI$_3$ monolayer, and the importance of the
+spin-orbit coupling is discussed.",2203.01120v2
+2022-11-17,Uncovering hidden spin polarization of energy bands in antiferromagnets,"Many textbook physical effects in crystals are enabled by some specific
+symmetries. In contrast to such ""apparent effects"", ""hidden effect X"" refers to
+the general condition where the nominal global system symmetry would disallow
+the effect X, whereas the symmetry of local sectors within the crystal would
+enable effect X. Known examples include the hidden Rashba and/or hidden
+Dresselhaus spin polarization that require spin orbit coupling, but (unlike the
+apparent Rashba and Dresselhaus counterparts) can exist even in
+inversion-symmetric non-magnetic crystals. Here we point out that the spin
+splitting effect that does not require spin-orbit coupling (SOC) can have a
+hidden spin polarization counterpart in antiferromagnets. We show that such
+hidden, SOC-independent effects reflect intrinsic properties of the perfect
+crystal rather than an effect due to imperfections, opening the possibility for
+experimental realization, and offering a potential way to switch
+antiferromagnetic ordering.",2211.09921v1
+2023-05-17,Emergence of a spin microemulsion in spin-orbit coupled Bose-Einstein condensates,"We report the first numerical prediction of a ""spin microemulsion"" -- a phase
+with undulating spin domains resembling classical bicontinuous
+oil-water-surfactant emulsions -- in two-dimensional systems of spinor
+Bose-Einstein condensates with isotropic Rashba spin-orbit coupling. Using
+field-theoretic numerical simulations, we investigated the melting of a
+low-temperature stripe phase with supersolid character and find that the
+stripes lose their superfluidity at elevated temperature and undergo a
+Kosterlitz--Thouless-like transition into a spin microemulsion. Momentum
+distribution calculations highlight a thermally broadened occupation of the
+Rashba circle of low-energy states with macroscopic and isotropic occupation
+around the ring. We provide a finite-temperature phase diagram that positions
+the emulsion as an intermediate, structured isotropic phase with residual
+quantum character before transitioning at higher temperature into a
+structureless normal fluid.",2305.10390v3
+2023-06-07,Structural Relaxation of Materials with Spin-Orbit Coupling: Analytical Forces in Spin-Current DFT,"Analytical gradients of the total energy are provided for local density and
+generalized-gradient hybrid approximations to generalized Kohn-Sham
+spin-current density functional theory (SCDFT). It is shown that gradients may
+be determined analytically, in a two-component framework, including spin-orbit
+coupling (SOC), with high accuracy. We demonstrate that renormalization of the
+electron-electron potential by SOC-induced spin-currents can account for
+considerable modification of crystal structures. In the case of Iodine-based
+molecular crystals, the effect may amount to more than half of the total
+modification of the structure by SOC. Such effects necessitate an SCDFT, rather
+than DFT, formulation, in which exchange-correlation functionals are endowed
+with an explicit dependence on spin-current densities. An implementation is
+presented in the \textsc{Crystal} program.",2306.04309v2
+2023-10-02,Spin-orbit enabled unconventional Stoner magnetism,"The Stoner instability remains a cornerstone for understanding metallic
+ferromagnets. This instability captures the interplay of Coulomb repulsion,
+Pauli exclusion, and two-fold fermionic spin degeneracy. In materials with
+spin-orbit coupling, this fermionic spin is generalized to a two-fold
+degenerate pseudospin which is typically believed to have symmetry properties
+as spin. Here we identify a distinct symmetry of this pseudospin that forbids
+it to couple to a Zeeman field. This `spinless' property is required to exist
+in five non-symmorphic space groups and has non-trivial implications for
+superconductivity and magnetism. With Coulomb repulsion, Fermi surfaces
+composed primarily of this spinless pseudospin feature give rise to Stoner
+instabilities into magnetic states that are qualitatively different than
+ferromagnets. These spinless-pseudospin ferromagnets break time-reversal
+symmetry, have a vanishing magnetization, are non-collinear, and exhibit
+altermagnetic-like energy band spin-splittings. In superconductors, for all
+pairing symmetries and field orientations, this spinless pseudospin
+extinguishes paramagnetic limiting. We discuss applications to superconducting
+UCoGe and magnetic NiS$_{2-x}$Se$_x$.",2310.00838v2
+2023-10-18,Chiral topological metals with multiple types of quasiparticle fermions and large spin Hall effect in the SrGePt family materials,"We present a prediction of chiral topological metals with several classes of
+unconventional quasiparticle fermions in a family of SrGePt-type materials in
+terms of first-principles calculations. In these materials, fourfold spin-3/2
+Rarita-Schwinger-Weyl (RSW) fermion, sixfold excitation, and Weyl fermions
+coexist around the Fermi level as spin-orbit coupling is considered, and the
+Chern number for the first two kinds of fermions is the maximal value four. We
+found that large Fermi arcs from spin-3/2 RSW fermion emerge on the
+(010)-surface, spanning the whole surface Brillouin zone. Moreover, there exist
+Fermi arcs originating from Weyl points, which further overlap with trivial
+bulk bands. In addition, we revealed that the large spin Hall conductivity can
+be obtained, which attributed to the remarkable spin Berry curvature around the
+degenerate nodes and band-splitting induced by spin-orbit coupling. Our
+findings indicate that the SrGePt family of compounds provide an excellent
+platform for studying on topological electronic states and the intrinsic spin
+Hall effect.",2310.11668v1
+2019-03-12,Anomalous spin Nernst effect in Weyl semimetals,"The spin Nernst effect describes a transverse spin current induced by the
+longitudinal thermal gradient in a system with the spin-orbit coupling. Here we
+study the spin Nernst effect in a mesoscopic four-terminal cross-bar Weyl
+semimetal device under a perpendicular magnetic field. By using the
+tight-binding Hamiltonian combining with the nonequilibrium Green's function
+method, the three elements of the spin current in the transverse leads and then
+spin Nernst coefficients are obtained. The results show that the spin Nernst
+effect in the Weyl semimetal has the essential difference with the traditional
+one: The z direction spin currents is zero without the magnetic field while it
+appears under the magnetic field, and the x and y direction spin currents in
+the two transverse leads flows out or flows in together, in contrary to the
+traditional spin Nernst effect, in which the spin current is induced by the
+spin-orbit coupling and flows out from one lead and flows in on the other. So
+we call it the anomalous spin Nernst effect. In addition, we show that the Weyl
+semimetals have the center-reversal-type symmetry, the mirror-reversal-type
+symmetry and the electron-hole-type symmetry, which lead to the spin Nernst
+coefficients being odd function or even function of the Fermi energy, the
+magnetic field and the transverse terminals. Moreover, the spin Nernst effect
+in the Weyl semimetals are strongly anisotropic and its coefficients are
+strongly dependent on both the direction of thermal gradient and the direction
+of the transverse lead connection. Three non-equivalent connection modes (x-z,
+z-x and x-y modes) are studied in detail, and the spin Nernst coefficients for
+three different modes exhibit very different behaviors. These strongly
+anisotropic behaviors of the spin Nernst effect can be used as the
+characterization of magnetic Weyl semimetals.",1903.04848v1
+2012-07-11,Superfluidity and collective modes in Rashba spin-orbit coupled Fermi gases,"We present a theoretical study of the superfluidity and the corresponding
+collective modes in two-component atomic Fermi gases with s-wave attraction and
+synthetic Rashba spin-orbit coupling. The general effective action for the
+collective modes is derived from the functional path integral formalism. By
+tuning the spin-orbit coupling from weak to strong, the system undergoes a
+crossover from an ordinary BCS/BEC superfluid to a Bose-Einstein condensate of
+rashbons. We show that the properties of the superfluid density and the
+Anderson-Bogoliubov mode manifest this crossover. At large spin-orbit coupling,
+the superfluid density and the sound velocity become independent of the
+strength of the s-wave attraction. The two-body interaction among the rashbons
+is also determined. When a Zeeman field is turned on, the system undergoes
+quantum phase transitions to some exotic superfluid phases which are
+topologically nontrivial. For the two-dimensional system, the nonanalyticities
+of the thermodynamic functions and the sound velocity across the phase
+transition are related to the bulk gapless fermionic excitation which causes
+infrared singularities. The superfluid density and the sound velocity behave
+nonmonotonically: they are suppressed by the Zeeman field in the normal
+superfluid phase, but get enhanced in the topological superfluid phase. The
+three-dimensional system is also studied.",1207.2810v4
+2012-07-24,Unusual Zeeman-field effects in two-dimensional spin-orbit-coupled Fermi superfluids,"We investigate the Zeeman field effects on the bulk superfluid properties and
+the collective modes in two-dimensional (2D) attractive atomic Fermi gases with
+Rashba-type spin-orbit coupling. In the presence of a large spin-orbit
+coupling, the system undergoes a quantum phase transition to a topological
+superfluid state at a critical Zeeman field. We show that the nonanalyticities
+of the thermodynamic functions as well as other physical quantities at the
+quantum phase transition originate from the infrared singularities caused by
+the gapless fermionic spectrum. The same argument applies also to the BCS-BEC
+evolution in 2D fermionic superfluids with $p$- or d-wave pairing. The
+superfluid density $n_s$ and the velocity of the Goldstone sound mode $c_s$
+behave oppositely in the normal and the topological superfluid phases: they are
+suppressed by the Zeeman field in the normal superfluid phase, but get enhanced
+in the topological superfluid phase. The velocity of the Goldstone sound mode
+also shows nonanalyticity at the quantum phase transition. For large Zeeman
+field, we find $n_s\rightarrow n$ and $c_s\rightarrow \upsilon_{\rm F}$, where
+$n$ is the total fermion density and $\upsilon_{\rm F}$ is the Fermi velocity
+of noninteracting system. The unusual behavior of the superfluid density and
+the collective modes can be understood by the fact that the spin-orbit-coupled
+superfluid state at large Zeeman field can be mapped to the $p_x+ip_y$
+superfluid state of spinless fermions.",1207.5685v2
+2014-10-13,Topological Fulde-Ferrell Superfluids of a Spin-Orbit Coupled Fermi Gas,"Topological Fermi superfluids have played the central role in various fields
+of physics. However, all previous studies focus on the cases where Cooper pairs
+have zero center-of-mass momenta (i.e. normal superfluids). The topology of
+Fulde-Ferrell superfluids with nonzero momentum pairings have never been
+explored until recent findings that Fulde-Ferrell superfluids in a spin-orbit
+coupled Fermi gas can accommodate Majorana fermions in real space in low
+dimensions and Weyl fermions in momentum space in three dimension. In this
+review, we first discuss the mechanism of pairings in spin-orbit coupled Fermi
+gases in optical lattices subject to Zeeman fields, showing that spin-orbit
+coupling as well as Zeeman fields enhance Fulde-Ferrell states while suppress
+Larkin-Ovchinnikov states. We then present the low temperature phase diagram
+including both FF superfluids and topological FF superfluids phases in both two
+dimension and three dimension. In one dimension, Majorana fermions as well as
+phase dependent order parameter are visualized. In three dimension, we show the
+properties of Weyl fermions in momentum space such as anisotropic linear
+dispersion, Fermi arch, and gaplessness away from $k_{\perp}=0$. Finally, we
+discuss some possible methods to probe FF superfluids and topological FF
+superfluids in cold atom systems.",1410.3497v2
+2014-10-16,Impurity-induced bound states in superconductors with spin-orbit coupling,"We study the effect of strong spin-orbit coupling (SOC) on bound states
+induced by impurities in superconductors. The presence of spin-orbit coupling
+breaks the $\mathbb{SU}(2)$-spin symmetry and causes the superconducting order
+parameter to have generically both singlet (s-wave) and triplet (p-wave)
+components. We find that in the presence of SOC the spectrum of
+Yu-Shiba-Rusinov (YSR) states is qualitatively different in s-wave and p-wave
+superconductor, a fact that can be used to identify the superconducting pairing
+symmetry of the host system. We also predict that in the presence of SOC the
+spectrum of the impurity-induced bound states depends on the orientation of the
+magnetic moment $\bf{S}$ of the impurity and, in particular, that by changing
+the orientation of $\bf{S}$ the fermion-parity of the lowest energy bound state
+can be tuned. We then study the case of a dimer of magnetic impurities and show
+that in this case the YSR spectrum for a p-wave superconductor is qualitatively
+very different from the one for an s-wave superconductor even in the limit of
+vanishing SOC. Our predictions can be used to distinguish the symmetry of the
+order parameter and have implications for the Majorana proposals based on
+chains of magnetic atoms placed on the surface of superconductors with strong
+spin-orbit coupling.",1410.4558v3
+2015-12-01,Quench dynamics of a Bose-Einstein condensate under synthetic spin-orbit coupling,"We study the quench dynamics of a Bose-Einstein condensate under a
+Raman-assisted synthetic spin-orbit coupling. To model the dynamical process,
+we adopt a self-consistent Bogoliubov approach, which is equivalent to applying
+the time-dependent Bogoliubov-de-Gennes equations. We investigate the dynamics
+of the condensate fraction as well as the momentum distribution of the Bose gas
+following a sudden change of system parameters. Typically, the system evolves
+into a steady state in the long-time limit, which features an oscillating
+momentum distribution and a stationary condensate fraction which is dependent
+on the quench parameters. We investigate how different quench parameters such
+as the inter- and intra-species interactions and the spin-orbit-coupling
+parameters affect the condensate fraction in the steady state. Furthermore, we
+find that the time average of the oscillatory momentum distribution in the
+long-time limit can be described by a generalized Gibbs ensemble with two
+branches of momentum-dependent Gibbs temperatures. Our study is relevant to the
+experimental investigation of dynamical processes in a spin-orbit coupled
+Bose-Einstein condensate.",1512.00160v3
+2020-01-23,First- and Second-Order Topological Superconductivity and Temperature-Driven Topological Phase Transitions in the Extended Hubbard Model with Spin-Orbit Coupling,"The combination of spin-orbit coupling with interactions results in many
+exotic phases of matter. In this Letter, we investigate the superconducting
+pairing instability of the two-dimensional extended Hubbard model with both
+Rashba and Dresselhaus spin-orbit coupling within the mean-field level at both
+zero and finite temperature. We find that both first- and second-order
+time-reversal symmetry breaking topological gapped phases can be achieved under
+appropriate parameters and temperature regimes due to the presence of a favored
+even-parity $s+id$-wave pairing even in the absence of an external magnetic
+field or intrinsic magnetism. This results in two branches of chiral Majorana
+edge states on each edge or a single zero-energy Majorana corner state at each
+corner of the sample. Interestingly, we also find that not only does tuning the
+doping level lead to a direct topological phase transition between these two
+distinct topological gapped phases, but also using the temperature as a highly
+controllable and reversible tuning knob leads to different direct
+temperature-driven topological phase transitions between gapped and gapless
+topological superconducting phases. Our findings suggest new possibilities in
+interacting spin-orbit coupled systems by unifying both first- and higher-order
+topological superconductors in a simple but realistic microscopic model.",2001.08739v2
+2021-12-26,Information theoretic approach to effects of spin-orbit coupling in Bose-Einstein condensates,"We make use of Shannon entropy ($S$) and Fisher information ($I$) to study
+the response of atomic density profiles of a spin-orbit coupled Bose-Einstein
+condensate to changes in the wave number ($\kappa_L$) of the Raman laser that
+couples two hyperfine states of atoms in the condensate. The choice for values
+of $\kappa_L$, the so-called spin-orbit parameter, and Rabi frequency
+($\Omega$) leads to two distinct regions in the system's energy spectrum with
+different order parameters and/or probability densities. In addition, we can
+have a spatially modulated density profile, reminiscent of the so called stripe
+phase. Our numbers for $S$ and $I$ demonstrate that for $\kappa_L^2<\Omega$
+(region 1) the density profile becomes localized as $\kappa_L$ increases while
+we observe delocalization in the density distribution for $\kappa_L^2>\Omega$
+(region 2) for increasing values of $\kappa_L$. In the stripe phase the nature
+of $S$ and $I$ to changes in $\kappa_L$ is similar to that found for the
+condensate in region 2. The results for information theoretic quantities in the
+stripe phase are, in general, augmented compared to those of region 2. In
+particular, the highly enhanced values of position-space Fisher information
+imply an extremely concentrated atomic density distribution to provide an
+evidence for supersolid properties of Bose-Einstein condensates in the presence
+of spin-orbit coupling.",2112.13417v1
+2023-03-29,The Mott transition in the 5d$^1$ compound Ba$_2$NaOsO$_6:$ a DFT+DMFT study with PAW spinor projectors,"Spin-orbit coupling has been reported to be responsible for the insulating
+nature of the 5d$^1$ osmate double perovskite Ba$_2$NaOsO$_6$ (BNOO). However,
+whether spin-orbit coupling indeed drives the metal-to-insulator transition
+(MIT) in this compound is an open question. In this work we investigate the
+impact of relativistic effects on the electronic properties of BNOO via density
+functional theory plus dynamical mean-field theory calculations in the
+paramagnetic regime, where the insulating phase is experimentally observed. The
+correlated subspace is modeled with spinor projectors of the projector
+augumented wave method (PAW) employed in the Vienna Ab Initio Simulation
+Package (VASP), suitably interfaced with the TRIQS package. The inclusion of
+PAW spinor projectors in TRIQS enables the treatment of spin-orbit coupling
+effects fully ab-initio within the dynamical mean-field theory framework. In
+the present work, we show that spin-orbit coupling, although assisting the MIT
+in BNOO, is not the main driving force for its gapped spectra, placing this
+material in the Mott insulator regime. Relativistic effects primarily impact
+the correlated states' character, excitations, and magnetic ground-state
+properties.",2303.16560v2
+2023-08-09,Magnetic Properties and Spin-orbit Coupling induced Semiconductivity in LK-99,"Recent reports of a possible room-temperature superconductor called LK-99
+have generated a lot of attention worldwide. In just a few days, a large amount
+of experimental works attempted to reproduce this sample and verify its
+properties. At the same time a large amount of theoretical works have also been
+reported. However, many experiments have drawn different conclusions, and many
+theoretical results are not consistent with experimental results. For one of
+the structures of LK-99 with the chemical formula as Pb9Cu(PO4)6O, many
+first-principles calculations did not consider spin-orbit coupling and
+concluded that it is a flat band metal. However, spin-orbit coupling is often
+not negligible in systems with heavy elements, and LK-99 contains a large
+amount of heavy element Pb. We performed calculations of electronic structure
+of Pb9Cu(PO4)6O with spin-orbit coupling, and the results show that it's not a
+metal but a semiconductor. This is consistent with many experimental results.
+In the ferromagnetic state Pb9Cu(PO4)6O is an indirect-bandgap semiconductor
+with a bandgap of 292 meV. Moreover, its conduction band is a flat band. At an
+electron doping level of 0.5 e/unit cell, Pb9Cu(PO4)6O becomes metallic and has
+a flat band with a width of only 25 meV at the Fermi level in the ferromagnetic
+state. While in the antiferromagnetic-A state, Pb9Cu(PO4)6O is a direct-bandgap
+semiconductor with a bandgap of 300 meV. As a magnetic narrowband
+semiconductor, Pb9Cu(PO4)6O may have potential application value in the field
+of optoelectronic device, photocatalytic, photodetector and spintronics device.",2308.05134v2
+2012-06-10,Topological Superconductivity without Proximity Effect,"Majorana Fermions, strange particles that are their own antiparticles, were
+predicted in 1937 and have been sought after ever since. In condensed matter
+they are predicted to exist as vortex core or edge excitations in certain
+exotic superconductors. These are topological superconductors whose order
+parameter phase winds non-trivially in momentum space. In recent years, a new
+and promising route for realizing topological superconductors has opened due to
+advances in the field of topological insulators. Current proposals are based on
+semiconductor heterostructures, where spin-orbit coupled bands are split by a
+band gap or Zeeman field and superconductivity is induced by proximity to a
+conventional superconductor. Topological superconductivity is obtained in the
+interface layer. The proposed heterostructures typically include two or three
+layers of different materials. In the current work we propose a device based on
+materials with inherent spin-orbit coupling and an intrinsic tendency for
+superconductivity, eliminating the need for a separate superconducting layer.
+We study a lattice model that includes spin-orbit coupling as well as on-site
+and nearest neighbor interaction. Within this model we show that topological
+superconductivity is possible in certain regions of parameter space. These
+regions of non-trivial topology can be understood as a nodeless superconductor
+with d-wave symmetry which, due to the spin-orbit coupling, acquires an extra
+phase twist of $2\pi$.",1206.2028v2
+2013-12-29,Artificial Gauge Fields and Spin-Orbit Couplings in Cold Atom Systems,"This article is a report of Projet bibliographique of M1 at \'Ecole Normale
+Sup\'erieure. In this article we reviewed the historical developments in
+artificial gauge fields and spin-orbit couplings in cold atom systems. We
+resorted to origins of literatures to trace the ideas of the developments. For
+pedagogical purposes, we tried to work out examples carefully and clearly, to
+verified the validity of various approximations and arguments in detail, and to
+give clear physical and mathematical pictures of the problems that we
+discussed. The first part of this article introduced the fundamental concepts
+of Berry phase and Jaynes-Cummings model. The second part reviewed two schemes
+to generate artificial gauge fields with N-pod scheme in cold atom systems. The
+first one is based on dressed-atom picture which provide a method to generate
+non-Abelian gauge fields with dark states. The second one is about rotating
+scheme which is achieved earlier historically. Non-Abelian gauge field
+inevitably leads to spin-orbit coupling. We reviewed some developments in
+achieve spin-orbital coupling theoretically and experimentally. The fourth part
+was devoted to recently developed idea of optical flux lattice that provides a
+possibility to reach the strongly correlated regime in cold atom systems. We
+developed a geometrical interpretation based on Cooper's theory. Some useful
+formulae and their proofs were listed in the Appendix.",1312.7486v1
+2014-11-16,Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors,"The low-energy electronic states of the iron-based superconductors are
+strongly affected by both spin-orbit coupling and, when present, by the nematic
+order. These two effects have different physical origins, yet they can lead to
+similar gap features in the electronic spectrum. Here we show how to
+disentangle them experimentally in the iron superconductors with one Fe plane
+per unit cell. Although the splitting of the low energy doublet at the
+Brillouin zone center ($\Gamma$-point) can be due to either the spin-orbit
+coupling or the nematic order, or both, the degeneracy of each of the doublet
+states at the zone corner ($M$-point) is protected by the space group symmetry
+even when spin-orbit coupling is taken into account. Therefore, any splitting
+at $M$ must be due to lowering of the crystal symmetry, such as due to the
+nematic order. We further analyze a microscopic tight-binding model with two
+different contributions to the nematic order: $d_{xz}/d_{yz}$ onsite energy
+anisotropy and the $d_{xy}$ hopping anisotropy. We find that a precise
+determination of the former, which has been widely used to characterize the
+nematic phase, requires a simultaneous measurement of the splittings of the
+$\Gamma$-point doublet and at the two low-energy $M$-point doublets. We also
+discuss the impact of twin domains and show how our results shed new light on
+ARPES measurements in the normal state of these materials.",1411.4303v1
+2014-03-04,Universal Borromean Binding in Spin-Orbit Coupled Ultracold Fermi Gases,"Borromean rings and Borromean binding, a class of intriguing phenomena as
+three objects are linked (bound) together while any two of them are unlinked
+(unbound), widely exist in nature and have been found in systems of biology,
+chemistry and physics. Previous studies have suggested that the occurrence of
+such a binding in physical systems typically relies on the microscopic details
+of pairwise interaction potentials at short-range, and is therefore
+non-universal. Here, we report a new type of Borromean binding in ultracold
+Fermi gases with Rashba spin-orbit coupling, which is {\it universal} against
+short-range interaction details, with its binding energy only dependent on the
+s-wave scattering length and the spin-orbit coupling strength. We show that the
+occurrence of this universal Borromean binding is facilitated by the symmetry
+of the single-particle dispersion under spin-orbit coupling, and is therefore
+{\it symmetry-selective} rather than interaction-selective. The state is robust
+over a wide range of mass ratio between composing fermions, which are
+accessible by Li-Li, K-K and K-Li mixtures in cold atoms experiments. Our
+results reveal the importance of symmetry factor in few-body physics, and shed
+light on the emergence of new quantum phases in a many-body system with exotic
+few-body correlations.",1403.0649v2
+2016-11-09,Perturbational treatment of spin-orbit coupling for generally applicable high-level multi-reference methods,"An efficient perturbational treatment of spin-orbit coupling within the
+framework of high-level multi-reference techniques has been implemented in the
+most recent version of the COLUMBUS quantum chemistry package, extending the
+existing fully variational two-component (2c) multi-reference configuration
+interaction singles and doubles (MRCISD) method. The proposed scheme follows
+related implementations of quasi-degenerate perturbation theory (QDPT) model
+space techniques. Our model space is built either from uncontracted,
+large-scale scalar relativistic MRCISD wavefunctions or based on the
+scalar-relativistic solutions of the linear-response-theory-based
+multi-configurational averaged quadratic coupled cluster method (LRT-MRAQCC).
+The latter approach allows for a consistent, approximatively size-consistent
+and size-extensive treatment of spin-orbit coupling. The approach is described
+in detail and compared to a number of related techniques. The inherent accuracy
+of the QDPT approach is validated by comparing cuts of the potential energy
+surfaces of acrolein and its S, Se, and Te analoga with the corresponding data
+obtained from matching fully variational spin-orbit MRCISD calculations. The
+conceptual availability of approximate analytic gradients with respect to
+geometrical displacements is an attractive feature of the 2c-QDPT-MRCISD and
+2c-QDPT-LRT-MRAQCC methods for structure optimization and ab inito molecular
+dynamics simulations.",1611.02884v1
+2018-05-31,Drag force and superfluidity in the supersolid stripe phase of a spin-orbit-coupled Bose-Einstein condensate,"The phase diagram of a spin-orbit-coupled two-component Bose gas includes a
+supersolid stripe phase, which is featuring density modulations along the
+direction of the spin-orbit coupling. This phase has been recently found
+experimentally [J.~Li \textit{et al.}, Nature (London) \textbf{543}, 91
+(2017)]. In the present work we characterize the superfluid behavior of the
+stripe phase by calculating the drag force acting on a moving impurity. Because
+of the gapless band structure of the excitation spectrum, the Landau critical
+velocity vanishes if the motion is not strictly parallel to the stripes, and
+energy dissipation takes place at any speed. Moreover, due to the spin-orbit
+coupling, the drag force can develop a component perpendicular to the velocity
+of the impurity. Finally, by estimating the time over which the energy
+dissipation occurs, we find that for slow impurities the effects of friction
+are negligible on a time scale up to several seconds, which is comparable with
+the duration of a typical experiment.",1805.12552v3
+2013-09-26,Spectral Properties and Local Density of States of Disordered Quantum Hall Systems with Rashba Spin-Orbit Coupling,"We theoretically investigate the spectral properties and the spatial
+dependence of the local density of states (LDoS) in disordered two-dimensional
+electron gases (2DEG) in the quantum Hall regime, taking into account the
+combined presence of electrostatic disorder, random Rashba spin-orbit in-
+teraction, and finite Zeeman coupling. To this purpose, we extend a
+coherent-state Green's function formalism previously proposed for spinless 2DEG
+in the presence of smooth arbitrary disorder, that here incorporates the
+nontrivial coupling between the orbital and spin degrees of freedom into the
+electronic drift states. The formalism allows us to obtain analytical and
+controlled nonperturbative expressions of the energy spectrum in arbitrary
+locally flat disorder potentials with both random electric fields and Rashba
+coupling. As an illustration of this theory, we derive analytical microscopic
+expressions for the LDoS in different temperature regimes which can be used as
+a starting point to interpret scanning tunneling spectroscopy data at high
+magnetic fields. In this context, we study the spatial dependence and linewidth
+of the LDoS peaks and explain an experimentally-noticed correlation between the
+spatial dispersion of the spin-orbit splitting and the local extrema of the
+potential landscape.",1309.6977v2
+2016-12-06,Thermal conductivity of local moment models with strong spin-orbit coupling,"We study the magnetic and lattice contributions to the thermal conductivity
+of electrically insulating strongly spin-orbit coupled magnetically ordered
+phases on a two-dimensional honeycomb lattice using the Kitaev-Heisenberg
+model. Depending on model parameters, such as the relative strength of the
+spin-orbit induced anisotropic coupling, a number of magnetically ordered
+phases are possible. In this work, we study two distinct regimes of thermal
+transport depending on whether the characteristic energy of the phonons or the
+magnons dominates, and focus on two different relaxation mechanisms, boundary
+scattering and magnon-phonon scattering. For spatially anisotropic magnetic
+phases, the thermal conductivity tensor can be highly anisotropic when the
+magnetic energy scale dominates, since the magnetic degrees of freedom dominate
+the thermal transport for temperatures well below the magnetic transition
+temperature. In the opposite limit in which the phonon energy scale dominates,
+the thermal conductivity will be nearly isotropic, reflecting the isotropic (at
+low temperatures) phonon dispersion assumed for the honeycomb lattice. We
+further discuss the extent to which thermal transport properties are influenced
+by strong spin-orbit induced anisotropic coupling in the local moment regime of
+insulating magnetic phases. The developed methodology can be applied to any 2D
+magnon-phonon system, and more importantly to systems where an analytical
+Bogoliubov transformation cannot be found and magnon bands are not necessarily
+isotropic.",1612.01658v1
+2018-10-11,(2+1)$-dimensional sonic black hole from spin-orbit coupled Bose-Einstein condensate and its analogue Hawking radiation,"We study the properties of a $2+1$ dimensional Sonic black hole (SBH) that
+can be realised, in a quasi-two-dimensional two-component spin-orbit coupled
+Bose-Einstein condensate (BEC). The corresponding equation for phase
+fluctuations in the total density mode that describes phonon field in the
+hydrodynamic approximation is described by a scalar field equation in $2+1$
+dimension whose space-time metric is significantly different from that of the
+SBH realised from a single component BEC that was studied experimentally, and,
+theoretically meticulously in literature. Given the breakdown of the
+irrotationality constraint of the velocity field in such spin-orbit coupled
+BEC, we study in detail how the time evolution of such condensate impacts the
+various properties of the resulting SBH. By time evolving the condensate in a
+suitably created laser-induced potential, we show that such a sonic black hole
+is formed, in an annular region bounded by inner and outer event horizon as
+well as elliptical ergo-surfaces. We observe amplifying density modulation due
+to the formation of such sonic horizons and show how they change the nature of
+analogue Hawking radiation emitted from such sonic black hole by evaluating the
+density-density correlation at different times, using the truncated Wigner
+approximation (TWA) for different values of spin-orbit coupling parameters. We
+finally investigate the thermal nature of such analogue Hawking radiation.",1810.04860v3
+2019-07-31,Spin-orbit coupled bosons interacting in a two-dimensional harmonic trap,"A system of bosons in a two-dimensional harmonic trap in the presence of
+Rashba-type spin-orbit coupling is investigated. An analytic treatment of the
+ground state of a single atom in the weak-coupling regime is presented and used
+as a basis for a perturbation theory in the interacting two-boson system. The
+numerical diagonalization of both the single-particle and the two-boson
+Hamiltonian matrices allows us to go beyond those approximations and obtain not
+only the ground state, but also the low-energy spectra and the different energy
+contributions separately. We show that the expectation value of the spin-orbit
+term is related to the expectation value of $\hat{\sigma}_z \hat{L}_z$ for the
+eigenstates of the system, regardless of the trapping potential. The low-energy
+states of the repulsively interacting two-boson system are characterized. With
+the presence of a sufficiently strong interaction and spin-orbit coupling
+strength, there is a direct energy-level crossing in the ground state of the
+system between states of different $J_z$, the third component of the total
+angular momentum, that changes its structure. This is reflected in a
+discontinuity in the different energy terms and it is signaled in the spatial
+density of the system.",1907.13355v2
+2000-06-14,The Jahn-Teller theorem for the 3d magnetic ions,"We argue that the Jahn-Teller theorem, if applied to 3d-ion compounds, has to
+be considered in the orbital+spin space. It is despite of the weakness of the
+intraatomic spin-orbit coupling.",0006231v1
+2021-11-15,Microscopic origin of multiferroic order in monolayer NiI$_2$,"The discovery of multiferroic behavior in monolayer NiI$_2$ provides a new
+symmetry-broken state in van der Waals monolayers, featuring the simultaneous
+emergence of helimagnetic order and ferroelectric order at a critical
+temperature of $T=21$ K. However, the microscopic origin of multiferroic order
+in NiI$_2$ monolayer has not been established, and in particular, the role of
+non-colinear magnetism and spin-orbit coupling in this compound remains an open
+problem. Here we reveal the origin of the two-dimensional multiferroicity in
+NiI$_2$ using first-principles electronic structure methods. We show that the
+helimagnetic state appears as a consequence of the long-range magnetic exchange
+interactions, featuring sizable magnetic moments in the iodine atoms. We
+demonstrate that the electronic density reconstruction accounting for the
+ferroelectric order emerges from the interplay of non-collinear magnetism and
+spin-orbit coupling. We demonstrate that the ferroelectric order is controlled
+by the iodine spin-orbit coupling, and leads to an associated
+electronically-driven distortion in the lattice. Our results establish the
+microscopic origin of the multiferroic behavior in monolayer NiI$_2$, putting
+forward the coexistence of helical magnetic order and ligand spin-orbit
+coupling as driving forces for multiferroic behavior in two-dimensional
+materials.",2111.07909v2
+2022-01-05,Controllable nonreciprocal optical response and handedness-switching in magnetized spin orbit coupled graphene,"Starting from a low-energy effective Hamiltonian model, we theoretically
+calculate the dynamical optical conductivity and permittivity tensor of a
+magnetized graphene layer with Rashba spin orbit coupling (SOC). Our results
+reveal a transverse Hall conductivity correlated with the usual nonreciprocal
+longitudinal conductivity. Further analysis illustrates that for intermediate
+magnetization strengths, the relative magnitudes of the magnetization and SOC
+can be identified experimentally by two well-separated peaks in the dynamical
+optical response (both the longitudinal and transverse components) as a
+function of photon frequency. Moreover, the frequency dependent permittivity
+tensor is obtained for a wide range of chemical potentials and magnetization
+strengths. Employing experimentally realistic parameter values, we calculate
+the circular dichroism of a representative device consisting of magnetized spin
+orbit coupled graphene and a dielectric insulator layer, backed by a metallic
+plate. The results reveal that this device has different relative
+absorptivities for right-handed and left-handed circularly polarized
+electromagnetic waves. It is found that the magnetized spin orbit coupled
+graphene supports strong handedness-switchings, effectively controlled by
+varying the chemical potential and magnetization strength with respect to the
+SOC strength.",2201.01779v2
+2022-05-23,Effect of spin-orbit coupling in one-dimensional quasicrystals with power-law hopping,"In the one-dimensional quasiperiodic Aubry-Andr\'{e}-Harper Hamiltonian with
+nearest-neighbor hopping, all single-particle eigenstates undergo a phase
+transition from ergodic to localized states at a critical disorder strength
+$W_c/t = 2.0$. There is no mobility edge in this system. However, in the
+presence of power-law hopping having the form $1/r^a$, beyond a critical
+disorder strength mobility edge appears for $a > 1$, while, for $0< a\leq 1$, a
+multifractal edge separates the extended and the multifractal states. In both
+these limits, depending on the strength of the disorder, lowest $\beta^s L$
+states are delocalized. We have found that, in the presence of the spin-orbit
+coupling, the critical disorder strength is always larger irrespective of the
+value of the parameter $a$. Furthermore, we demonstrate that for $a\leq 1$, in
+the presence of spin-orbit coupling, there exists multiple multifractal edges,
+and the energy spectrum splits up into alternative bands of delocalized and
+multifractal states. Moreover, the location of the multifractal edges are
+generally given by the fraction $(\beta^s \pm \beta^m)$. The qualitative
+behavior of the energy spectrum remains unaffected for $a > 1$. However, in
+contrast to the previously reported results, we find that in this limit,
+similar to the other case, multiple mobility edges can exist with or without
+the spin-orbit coupling.",2205.11305v1
+2005-04-22,Rashba interaction in quantum wires with in-plane magnetic fields,"We analyze the spectral and transport properties of ballistic quasi
+one-dimensional systems in the presence of spin-orbit coupling and in-plane
+agnetic fields. Our results demonstrate that Rashba precession and intersubband
+coupling must be treated on equal footing for wavevectors near the magnetic
+field induced gaps. We find that intersubband coupling limits the occurrence of
+negative effective masses at the gap edges and modifies the linear conductance
+curves in the strong coupling limit. The effect of the magnetic field on the
+spin textured orientation of the wire magnetization is discussed.",0504578v2
+2014-07-21,Optical spin-to-orbital angular momentum conversion in ultra-thin metasurfaces with arbitrary topological charges,"Orbital angular momentum associated with the helical phase-front of optical
+beams provides an unbounded \qo{space} for both classical and quantum
+communications. Among the different approaches to generate and manipulate
+orbital angular momentum states of light, coupling between spin and orbital
+angular momentum allows a faster manipulation of orbital angular momentum
+states because it depends on manipulating the polarisation state of light,
+which is simpler and generally faster than manipulating conventional orbital
+angular momentum generators. In this work, we design and fabricate an
+ultra-thin spin-to-orbital angular momentum converter, based on plasmonic
+nano-antennas and operating in the visible wavelength range that is capable of
+converting spin to an arbitrary value of OAM $\ell$. The nano-antennas are
+arranged in an array with a well-defined geometry in the transverse plane of
+the beam, possessing a specific integer or half-integer topological charge $q$.
+When a circularly polarised light beam traverses this metasurface, the output
+beam polarisation switches handedness and the OAM changes in value by $\ell =
+\pm2q\hbar$ per photon. We experimentally demonstrate $\ell$ values ranging
+from $\pm 1$ to $\pm 25$ with conversion efficiencies of $8.6\pm0.4~\%$. Our
+ultra-thin devices are integratable and thus suitable for applications in
+quantum communications, quantum computations and nano-scale sensing.",1407.5491v1
+2015-06-03,Large orbital moment and spin-orbit enabled Mott transition in the Ising Fe honeycomb lattice BaFe2(PO4)2,"BaFe2(PO4)2 is an unusual Ising insulating ferromagnet based on the Fe$^{2+}$
+spin $S$ = 2 ion, the susceptibility of which suggests a large orbital
+component to the Fe local moment. We apply density functional theory based
+methods to obtain a microscopic picture of the competing interactions and the
+critical role of spin-orbit coupling (SOC) in this honeycomb lattice system.
+The low-temperature ferromagnetic phase displays a half-semimetallic Dirac
+point pinning the Fermi level and preventing gap opening before consideration
+of SOC, presenting a case in which correlation effects modeled by a repulsive
+Hubbard $U$ fail to open a gap. Simultaneous inclusion of both correlation and
+SOC drives a large orbital moment in excess of 0.7 $\mu_B$ (essentially $L$ =
+1) for spin aligned along the $\hat{c}$ axis, with a gap comparable with the
+inferred experimental value. The large orbital moment accounts for the large
+Ising anisotropy, in spite of the small magnitude of the SOC strength on the
+3$d$ (Fe) ion. Ultimately, the Mott-Hubbard gap is enabled by degeneracy
+lifting by SOC and the large Fe moments, rather than by standard Hubbard
+interactions alone. We suggest that competing orbital occupations are
+responsible for the structural transitions involved in the observed re-entrant
+rhombohedral-triclinic-rhombohedral sequence.",1506.01413v2
+2018-02-23,Nonlocal orbital magnetism of 3d adatoms deposited on the Pt(111) surface,"The orbital magnetic moment is still surprisingly not well understood, in
+contrast to the spin part. Its description in finite systems, such as isolated
+atoms and molecules, is not problematic, but it was only recently that a
+rigorous picture was provided for extended systems. Here we focus on an
+intermediate class of systems: magnetic adatoms placed on a non-magnetic
+surface. We show that the essential quantity is the ground-state charge current
+density, in the presence of spin-orbit coupling, and set out its
+first-principles description. This is illustrated by studying the magnetism of
+the surface Pt electrons, induced by the presence of Cr, Mn, Fe, Co and Ni
+adatoms. A physically appealing partition of the charge current is introduced.
+This reveals that there is an important nonlocal contribution to the orbital
+moments of the Pt atoms, extending three times as far from each magnetic adatom
+as the induced spin and local orbital moments. We find that it is as sizable as
+the latter, and attribute its origin to a spin-orbital susceptibility of the Pt
+surface, different from the one responsible for the formation of the local
+orbital moments.",1802.08609v1
+2020-06-14,Intrinsic orbital and spin Hall effects in monolayer transition metal dichalcogenides,"Orbital Hall effect (OHE) is the phenomenon of transverse flow of orbital
+moment in presence of an applied electric field. Solids with broken inversion
+symmetry are expected to exhibit a strong OHE due to the presence of an
+intrinsic orbital moment at individual momentum points in the Brillouin zone,
+which in presence of an applied electric field, flows in different directions
+causing a net orbital Hall current. Here we provide a comprehensive
+understanding of the effect and its tunability in the monolayer 2D transition
+metal dichalcogenides (TMDCs). Both metallic and insulating TMDCs are
+investigated from full density-functional calculations, effective $d$-band
+tight-binding models, as well as a minimal four-band model for the valley
+points that captures the key physics of the system. For the tuning of the OHE,
+we examine the role of hole doping as well as the change in the band
+parameters, which, e. g., can be controlled by strain. We demonstrate that the
+OHE is a more fundamental effect than the spin Hall effect (SHE), with the
+momentum-space orbital moments inducing a spin moment in the presence of the
+spin-orbit coupling, leading to the SHE. The physics of the OHE, described
+here, is relevant for 2D materials with broken inversion symmetry in general,
+even beyond the TMDCs, providing a broad platform for future research.",2006.07754v2
+2010-12-10,Density functional study of orbital-selective magnetism in FeAs-based superconductors,"We performed spin-polarized density functional calculations of
+lanthanide-series (Ln) iron oxypnictides LnFeAsO (Ln=La, Ce, Pr, Nd, Sm, and
+Gd) with constrained Fe magnetic moments, finding that in-plane dxy and
+out-of-plane dyz orbital characters are preferred for small Fe magnetic
+moments. Comparison of LnFeAsO compounds shows that the antiferromagnetism
+(AFM) from the Fe dxy orbital is itinerantly driven by orbital-dependent
+Fermi-surface nesting while AFM from the Fe dyz orbital is driven by
+superexchange mechanism. The Fe magnetic moments of the two orbital characters
+show different coupling strengths to Fermi-surface electrons
+orbital-selectively, suggesting that they may play different roles in
+superconductivity and in AFM, and making d orbital characters of the magnetic
+moment resolvable by measuring the electronic structures.",1012.2224v2
+2018-11-08,Magnetically-driven orbital-selective insulator-metal transition in double perovskite oxides,"Interaction-driven metal-insulator transitions or Mott transitions
+  are widely observed in condensed-matter systems. In multi-orbital
+  systems, many-body physics is richer in which an orbital-selective
+  metal-insulator transition is an intriguing and unique
+  phenomenon. Here we use first-principles calculations to show that a
+  magnetic transition (from paramagnetic to long-range magnetically
+  ordered) can simultaneously induce an orbital-selective
+  insulator-metal transition in rock-salt ordered double perovskite
+  oxides $A_2BB'$O$_6$ where $B$ is a non-magnetic ion (Y$^{3+}$ and
+  Sc$^{3+}$) and $B'$ a
+  magnetic ion with a $d^3$ electronic configuration (Ru$^{5+}$ and
+  Os$^{5+}$). The orbital selectivity originates from
+  geometrical frustration of a face-centered-cubic lattice on which
+  the magnetic ions $B'$ reside. Including realistic structural
+  distortions and spin-orbit interaction do
+  not affect the transition. The predicted orbital-selective transition
+  naturally explains the anomaly observed in the electric resistivity
+  of Sr$_2$YRuO$_6$. Implications of other available experimental data
+  are also discussed. Our work shows that by exploiting
+  geometrical frustration on non-bipartite lattices, novel
+  electronic/magnetic/orbital-coupled phase transitions can occur in
+  correlated materials that are in the vicinity of metal-insulator phase
+  boundary.",1811.03465v1
+2014-01-16,Effect of core--mantle and tidal torques on Mercury's spin axis orientation,"The rotational evolution of Mercury's mantle and its core under conservative
+and dissipative torques is important for understanding the planet's spin state.
+Dissipation results from tides and viscous, magnetic and topographic
+core--mantle interactions. The dissipative core--mantle torques take the system
+to an equilibrium state wherein both spins are fixed in the frame precessing
+with the orbit, and in which the mantle and core are differentially rotating.
+This equilibrium exhibits a mantle spin axis that is offset from the Cassini
+state by larger amounts for weaker core--mantle coupling for all three
+dissipative core--mantle coupling mechanisms, and the spin axis of the core is
+separated farther from that of the mantle, leading to larger differential
+rotation. The relatively strong core--mantle coupling necessary to bring the
+mantle spin axis to its observed position close to the Cassini state is not
+obtained by any of the three dissipative core--mantle coupling mechanisms. For
+a hydrostatic ellipsoidal core--mantle boundary, pressure coupling dominates
+the dissipative effects on the mantle and core positions, and dissipation
+together with pressure coupling brings the mantle spin solidly to the Cassini
+state. The core spin goes to a position displaced from that of the mantle by
+about 3.55 arcmin nearly in the plane containing the Cassini state. With the
+maximum viscosity considered of $\nu\sim 15.0\,{\rm cm^2/s}$ if the coupling is
+by the circulation through an Ekman boundary layer or $\nu\sim 8.75\times
+10^5\,{\rm cm^2/s}$ for purely viscous coupling, the core spin lags the
+precessing Cassini plane by 23 arcsec, whereas the mantle spin lags by only
+0.055 arcsec. Larger, non hydrostatic values of the CMB ellipticity also result
+in the mantle spin at the Cassini state, but the core spin is moved closer to
+the mantle spin.",1401.4131v1
+2014-09-15,Magnetic anisotropy of FePt nanoparticles,"We carry out a systematic theoretical investigation of Magneto Crystalline
+Anisotropy (MCA) of L10 FePt clusters with alternating Fe and Pt planes along
+the (001) direction. We calculate the structural relaxation and magnetic moment
+of each cluster by using ab initio spin-polarized density functional theory
+(DFT), and the MCA with both spin-polarized DFT (including spin-orbit coupling
+self-consistently) and the torque method. We find that the MCA of any composite
+structure of a given size is enhanced with respect to that of the same-sized
+pure Pt or pure Fe cluster as well as to that of any pair of Fe and Pt atoms in
+bulk L10 FePt. This enhancement results from the hybridization we observe
+between the 3d orbital of the Fe atoms and the 5d orbital of their Pt
+neighbors. This hybridization, however, affects the electronic properties of
+the component atoms in significantly different ways. While it somewhat
+increases the spin moment of the Fe atoms, it has little effect on their
+orbital moment; at the same time, it greatly increases both the spin and
+orbital moment of the Pt atoms. Given the fact that the spin-orbit coupling
+(SOC) constant of Pt is about 7 times greater than that of Fe, this Fe-induced
+jump in the orbital moment of the Pt atoms produces the increase in MCA of the
+composite structures over that of their pure counterparts. That any composite
+structure exhibits higher MCA than bulk L10 FePt results from the lower
+coordination of Pt atoms in the cluster, whether Fe or Pt predominates within
+it. We also find that bipyramidal clusters whose central layer is Pt have
+higher MCA than their same-sized counterparts whose central layer is Fe. This
+results from the fact that Pt atoms in such configurations are coordinated with
+more Fe atoms than in the latter. By thus participating in more instances of
+hybridization, they contribute higher orbital moments to the overall MCA of the
+unit.",1409.4318v3
+2003-07-17,Mercury's spin-orbit model and signature of its dynamical parameters,"The 3:2 spin-orbit resonance between the rotational and orbital motions of
+Mercury results from a functional dependance on a tidal friction adding to a
+non-zero eccentricity with a permanent asymmetry in the equatorial plane of the
+planet. The upcoming space missions, MESSENGER and BepiColombo with onboard
+instrumentation capable of measuring the Mercury's rotational parameters,
+stimulate the objective to attempt to an accurate theory of the planet's
+rotation. We have used our BJV relativistic model of solar system integration
+including the spin-orbit motion of the Moon. This model had been previously
+built in accordance with the requirements of the Lunar Laser Ranging
+observational accuracy. We extended this model to the spin-orbit couplings of
+the terrestrial planets including Mercury; the updated model is called SONYR
+(acronym of Spin-Orbit N-BodY Relativistic model). An accurate rotation of
+Mercury has been then obtained. Moreover, the conception of the SONYR model is
+suitable for analyzing the different families of hermean rotational librations.
+We accurately identify the non-linear relations between the rotation of Mercury
+and its dynamical figure (\cmr2, $C_{20}$, and $C_{22}$). Notably, for a
+variation of 1% on the \cmr2 value, signatures in the $\phi$ hermean libration
+in longitude as well as in the $\eta$ obliquity of the planet are respectively
+0.45 arcseconds (as) and 2.4 milliarcseconds (mas). These determinations
+provide new constraints on the internal structure of Mercury to be discussed
+with the expected accuracy forecasted in the BepiColombo mission (respectively
+3.2 and 3.7 as according to Milani et al 2001).",0307328v1
+2004-06-02,Orbital and magnetic transitions in geometrically-frustrated vanadium spinels -- Monte Carlo study of an effective spin-orbital-lattice coupled model --,"We present our theoretical and numerical results on thermodynamic properties
+and the microscopic mechanism of two successive transitions in vanadium spinel
+oxides $A$V$_2$O$_4$ ($A$=Zn, Mg, or Cd) obtained by Monte Carlo calculations
+of an effective spin-orbital-lattice model in the strong correlation limit.
+Geometrical frustration in the pyrochlore lattice structure of V cations
+suppresses development of spin and orbital correlations, however, we find that
+the model exhibits two transitions at low temperatures. First, a discontinuous
+transition occurs with an orbital ordering assisted by the tetragonal
+Jahn-Teller distortion. The orbital order reduces the frustration in spin
+exchange interactions, and induces antiferromagnetic correlations in
+one-dimensional chains lying in the perpendicular planes to the tetragonal
+distortion. Secondly, at a lower temperature, a three-dimensional
+antiferromagnetic order sets in continuously, which is stabilized by the
+third-neighbor interaction among the one-dimensional antiferromagnetic chains.
+Thermal fluctuations are crucial to stabilize the collinear magnetic state by
+the order-by-disorder mechanism. The results well reproduce the experimental
+data such as transition temperatures, temperature dependence of the magnetic
+susceptibility, changes of the entropy at the transitions, and the magnetic
+ordering structure at low temperatures. Quantum fluctuation effect is also
+examined by the linear spin wave theory at zero temperature. The staggered
+moment in the ground state is found to be considerably reduced from saturated
+value, and reasonably agrees with the experimental data.",0406039v1
+2010-09-13,"Inspiral of Generic Black Hole Binaries: Spin, Precession, and Eccentricity","Given the absence of observations of black hole binaries, it is critical that
+the full range of accessible parameter space be explored in anticipation of
+future observation with gravitational wave detectors. To this end, we compile
+the Hamiltonian equations of motion describing the conservative dynamics of the
+most general black hole binaries, as computed by Will and collaborators, and
+incorporate an effective treatment of dissipation through gravitational
+radiation. We evolve these equations for systems with orbital eccentricity and
+precessing spins. We find that, while spin-spin coupling corrections can
+destroy constant radius orbits in principle, the effect is so small that orbits
+will reliably tend to quasi-spherical orbits as angular momentum and energy are
+lost to gravitational radiation. Still, binaries that are initially highly
+eccentric may retain eccentricity as they pass into the detectable bandwidth of
+ground-based gravitational wave detectors. We also show that a useful set of
+natural frequencies for an orbit demonstrating both spin precession and
+periastron precession is comprised of (1) the frequency of angular motion in
+the orbital plane, (2) the frequency of the plane precession, and (3) the
+frequency of radial oscillations. These three natural harmonics shape the
+observed waveform.",1009.2533v3
+2012-09-07,Spin-orbit coupling for tidally evolving super-Earths,"We investigate the spin behavior of close-in rocky planets and the
+implications for their orbital evolution. Considering that the planet rotation
+evolves under simultaneous actions of the torque due to the equatorial
+deformation and the tidal torque, both raised by the central star, we analyze
+the possibility of temporary captures in spin-orbit resonances. The results of
+the numerical simulations of the exact equations of motions indicate that,
+whenever the planet rotation is trapped in a resonant motion, the orbital decay
+and the eccentricity damping are faster than the ones in which the rotation
+follows the so-called pseudo-synchronization. Analytical results obtained
+through the averaged equations of the spin-orbit problem show a good agreement
+with the numerical simulations. We apply the analysis to the cases of the
+recently discovered hot super-Earths Kepler-10 b, GJ 3634 b and 55 Cnc e. The
+simulated dynamical history of these systems indicates the possibility of
+capture in several spin-orbit resonances; particularly, GJ 3634 b and 55 Cnc e
+can currently evolve under a non-synchronous resonant motion for suitable
+values of the parameters. Moreover, 55 Cnc e may avoid a chaotic rotation
+behavior by evolving towards synchronization through successive temporary
+resonant trappings.",1209.1580v1
+2013-11-05,Important Roles of Te 5p and Ir 5d Spin-orbit Interactions on the Multi-band Electronic Structure of Triangular Lattice Superconductor Ir1-xPtxTe2,"We report an angle-resolved photoemission spectroscopy (ARPES) study on a
+triangular lattice superconductor Ir$_{1-x}$Pt$_{x}$Te$_2$ in which the Ir-Ir
+or Te-Te bond formation, the band Jahn-Teller effect, and the spin-orbit
+interaction are cooperating and competing with one another. The Fermi surfaces
+of the substituted system are qualitatively similar to the band structure
+calculations for the undistorted IrTe$_2$ with an upward chemical potential
+shift due to electron doping. A combination of the ARPES and the band structure
+calculations indicates that the Te $5p$ spin-orbit interaction removes the
+$p_x/p_y$ orbital degeneracy and induces $p_x \pm ip_y$ type spin-orbit
+coupling near the A point. The inner and outer Fermi surfaces are entangled by
+the Te $5p$ and Ir $5d$ spin-orbit interactions which may provide exotic
+superconductivity with singlet-triplet mixing.",1311.1199v2
+2009-07-10,Dimensional Dependence of Weak Localization Corrections and Spin Relaxation in Quantum Wires with Rashba Spin-Orbit Coupling,"The quantum correction to the conductivity in disordered quantum wires with
+linear Rashba spin-orbit coupling is obtained. For quantum wires with
+spin-conserving boundary conditions, we find a crossover from weak anti- to
+weak localization as the wire width W is reduced using exact diagonalization of
+the Cooperon equation. This crossover is due to the dimensional dependence of
+the spin relaxation rate of conduction electrons, which becomes diminished,
+when the wire width is smaller than the bulk spin precession length $L_{SO}$.
+We thus confirm previous results for small wire width, $W/L_{SO}<= 1$
+[PRL98,176808(2007)], where only the transverse 0-modes of the Cooperon
+equation had been taken into account. We find that spin helix solutions become
+stable for arbitrary ratios of linear Rashba and Dresselhaus coupling in narrow
+wires. For wider wires, the spin relaxation rate is found to be not monotonous
+as function of wire width: it becomes first enhanced for W on the order of the
+bulk $L_{SO}$ before it becomes diminished for smaller wire widths. In
+addition, we find that the spin relaxation is smallest at the edge of the wire
+for wide wires. The effect of the Zeeman coupling to the magnetic field
+perpendicular to the 2D electron system is studied and found that it shifts the
+crossover from weak anti- to weak localization to larger wire widths $W_c$.
+When the transverse confinement potential of the quantum wire is smooth
+(adiabatic), the spin relaxation rate is found to be enhanced as W is reduced.
+We find that only a spin polarized state retains a finite spin relaxation rate
+in such narrow wires. Thus, we conclude that the injection of polarized spins
+into nonmagnetic quantum wires should be favorable in wires with smooth
+confinement potential. Finally, in wires with tubular shape, corresponding to
+transverse periodic boundary conditions, we find no reduction of the spin
+relaxation rate.",0907.1819v2
+2012-02-14,Low-Energy Effective Hamiltonian and the Surface States of Ca_3PbO,"The band structure of Ca_3PbO, which possesses a three-dimensional massive
+Dirac electron at the Fermi energy, is investigated in detail. Analysis of the
+orbital weight distributions on the bands obtained in the first-principles
+calculation reveals that the bands crossing the Fermi energy originate from the
+three Pb-p orbitals and three Ca-dx2y2 orbitals. Taking these Pb-p and Ca-dx2y2
+orbitals as basis wave functions, a tight-binding model is constructed. With
+the appropriate choice of the hopping integrals and the strength of the
+spin-orbit coupling, the constructed model sucessfully captures important
+features of the band structure around the Fermi energy obtained in the
+first-principles calculation. By applying the suitable basis transformation and
+expanding the matrix elements in the series of the momentum measured from a
+Dirac point, the low-energy effective Hamiltonian of this model is explicitely
+derived and proved to be a Dirac Hamiltonain. The origin of the mass term is
+also discussed. It is shown that the spin-orbit coupling and the orbitals other
+than Pb-p and Ca-dx2y2 orbitals play important roles in making the mass term
+finite. Finally, the surface band structures of Ca_3PbO for several types of
+surfaces are investigated using the constructed tight-binding model. We find
+that there appear nontrivial surface states that cannot be explained as the
+bulk bands projected on the surface Brillouin zone. The relation to the
+topological insulator is also discussed.",1202.2909v1
+2017-06-01,Spin-orbit precession along eccentric orbits for extreme mass ratio black hole binaries and its effective-one-body transcription,"In this work we present an analytical gravitational self-force calculation of
+the spin-orbit precession along an eccentric orbit around a Schwarzschild black
+hole, following closely the recent prescription of Akcay, Dempsey, and Dolan.
+We then transcribe this quantity within the Effective-One-Body (EOB) formalism,
+thereby determining several new, linear-in-mass-ratio, contributions in the
+post-Newtonian expansion of the spin-orbit couplings entering the EOB
+Hamiltonian. Namely, we determine the second gyro-gravitomagnetic ratio
+$g_{S_*}(r,p_r,p_{\phi})$ up to order $p_r^2/r^4$ included.",1706.00459v1
+2023-01-22,Violation of the orbital depairing limit in a non-unitary state --on the high field phase in the heavy Fermion superconductor UTe$_2$--,"A theoretical study is reported on the origin of extremely high upper
+critical field $\sim$70T observed in UTe$_2$ with the transition temperature
+T$_{\rm c}$=1.6K-2K, far exceeding the conventional orbital depairing limit set
+by the Fermi velocity and T$_{\rm c}$ for a superconductor (SC) in the clean
+limit. We investigate possible violation of the orbital limit in terms of a
+spin-triplet nonunitary state, which is effectively coupled to the underlying
+magnetization induced by external field. This in turn produces the reduced
+internal field by cancelling it via magnetization. We formulate a theory within
+Ginzburg-Landau framework to describe this orbital limit violation and analyze
+experimental data on the upper critical fields for various field orientations
+in UTe$_2$. It is pointed out that the orbital limit violation for a
+spin-triplet SC together with the Pauli-Clogston limit violation for a
+spin-singlet SC constitutes a complete and useful framework to examine the high
+field physics in superconductors in the clean limit.",2301.09035v1
+2003-02-14,An effective spin-orbital Hamiltonian for the double perovskite Sr$_2$FeW O$_6$: Derivation of the phase diagram,"We formulate a superexchange theory of insulating double-perovskite compounds
+such as Sr$_2$FeWO$_6$. An effective spin-orbital Hamiltonian is derived in the
+strong coupling limit of Hubbard model for d-electrons on Fe and W ions. The
+relevant degrees of freedom are the spins S=2 and the three-fold orbital
+degeneracy of Fe$^{2+}$-ions. W-sites are integrated out by means of a
+fourth-order perturbative expansion. The magnetically and orbitally ordered
+ground states of the effective Hamiltonia n are discussed as a function of the
+model parameters. We show that for realistic values of such parameters the
+ground state is antiferromagnetic, as experimentally observed. The order found
+is of type-II, consisting of \{111\} ferromagnetic planes stac ked
+antiferromagnetically. The orbital order energy scale found is one order of
+magnitude less than the spi n one.",0302293v1
+2012-10-26,Intrinsic and substrate induced spin-orbit interaction in chirally stacked trilayer graphene,"We present a combined group-theoretical and tight-binding approach to
+calculate the intrinsic spin-orbit coupling (SOC) in ABC stacked trilayer
+graphene. We find that compared to monolayer graphene, a larger set of d
+orbitals (in particular the d_{z^2} orbital) needs to be taken into account. We
+also consider the intrinsic SOC in bilayer graphene, because the comparison
+between our tight-binding bilayer results and the density functional
+computations of Ref.[40] allows us to estimate the values of the trilayer SOC
+parameters as well. We also discuss the situation when a substrate or adatoms
+induce strong SOC in only one of the layers of bilayer or ABC trilayer
+graphene. Both for the case of intrinsic and externally induced SOC we derive
+effective Hamiltonians which describe the low-energy spin-orbit physics. We
+find that at the K point of the Brillouin zone the effect of Bychkov-Rashba
+type SOC is suppressed in bilayer and ABC trilayer graphene compared to
+monolayer graphene.",1210.7158v2
+2013-03-26,Initial data for neutron star binaries with arbitrary spins,"The starting point of any general relativistic numerical simulation is a
+solution of the Hamiltonian and momentum constraints that (ideally) represents
+an astrophysically realistic scenario. We present a new method to produce
+initial data sets for binary neutron stars with arbitrary spins and orbital
+eccentricities. The method only provides approximate solutions to the
+constraints. However, we show that the corresponding constraint violations
+subside after a couple of orbits, becoming comparable to those found in
+evolutions of standard conformally flat, helically symmetric binary initial
+data. We evolve in time three data sets, corresponding to binaries with spins
+aligned, zero and anti-aligned with the orbital angular momentum. These
+simulations show the orbital ""hang-up"" effect previously seen in binary black
+holes. Additionally, all three show orbital eccentricities up to one order of
+magnitude smaller than those found in helically symmetric initial sets
+evolutions.",1303.6692v2
+2018-02-12,Electromagnetic wave propagating along a space curve,"Using the thin-layer approach, we derive the effective equation for the
+electromagnetic wave propagating along a space curve. We find intrinsic
+spin-orbit, extrinsic spin-orbit and extrinsic orbital angular momentum and
+intrinsic orbital angular momentum couplings induced by torsion, which can lead
+to geometric phase, spin and orbital Hall effects. And we show the helicity
+inversion induced by curvature that can convert the right-handed circularly
+polarized electromagnetic wave into left-handed polarized one, vice verse.
+Finally, we demonstrate that the gauge invariance of the effective dynamics is
+protected by the geometrically induced gauge potential.",1802.04059v1
+2012-04-17,Calibration of Equilibrium Tide Theory for Extrasolar Planet Systems II,"We present a new empirical calibration of equilibrium tidal theory for
+extrasolar planet systems, extending a prior study by incorporating detailed
+physical models for the internal structure of planets and host stars. The
+resulting strength of the stellar tide produces a coupling that is strong
+enough to reorient the spins of some host stars without causing catastrophic
+orbital evolution, thereby potentially explaining the observed trend in
+alignment between stellar spin and planetary orbital angular momentum. By
+isolating the sample whose spins should not have been altered in this model, we
+also show evidence for two different processes that contribute to the
+population of planets with short orbital periods.
+  We apply our results to estimate the remaining lifetimes for short period
+planets, examine the survival of planets around evolving stars, and determine
+the limits for circularisation of planets with highly eccentric orbits. Our
+analysis suggests that the survival of circularised planets is strongly
+affected by the amount of heat dissipated, which is often large enough to lead
+to runaway orbital inflation and Roche lobe overflow.",1204.3903v1
+2016-05-20,"Long-range orders, spin- and orbital-freezing in the two-band Hubbard model","We solve the orbitally degenerate two-band Hubbard model within dynamical
+mean field theory and map out the instabilities to various symmetry-broken
+phases based on an analysis of the corresponding lattice susceptibilities.
+Phase diagrams as a function of the Hund coupling parameter J are obtained both
+for the model with rotationally invariant interaction and for the model with
+Ising-type anisotropy. For negative J, an intra-orbital spin-singlet
+superconducting phase appears at low temperatures, while the normal state
+properties are characterized by an orbital freezing phenomenon. This is the
+negative-J analogue of the recently discovered fluctuating-moment induced
+s-wave spin-triplet superconductivity in the spin-freezing regime of
+multi-orbital models with J>0.",1605.06410v1
+2020-06-22,Imprinting and driving electronic orbital magnetism using magnons,"Magnons, as the most elementary excitations of magnetic materials, have
+recently emerged as a prominent tool in electrical and thermal manipulation and
+transport of spin, and magnonics as a field is considered as one of the pillars
+of modern spintronics. On the other hand, orbitronics, which exploits the
+orbital degree of freedom of electrons rather than their spin, emerges as a
+powerful platform in efficient design of currents and redistribution of angular
+momentum in structurally complex materials. Here, we uncover a way to bridge
+the worlds of magnonics and electronic orbital magnetism, which originates in
+the fundamental coupling of scalar spin chirality, inherent to magnons, to the
+orbital degree of freedom in solids. We show that this can result in efficient
+generation and transport of electronic orbital angular momentum by magnons,
+thus opening the road to combining the functionalities of magnonics and
+orbitronics to their mutual benefit in the realm of spintronics applications.",2006.13033v2
+2023-07-20,Enhanced photo-excitation and angular-momentum imprint of gray excitons in WSe$_{2}$ monolayers by spin-orbit-coupled vector vortex beams,"A light beam can be spatially structured in the complex amplitude to possess
+orbital angular momentum (OAM), which introduces a new degree of freedom
+alongside the intrinsic spin angular momentum (SAM) associated with circular
+polarization. Moreover, super-imposing two twisted lights with distinct SAM and
+OAM produces a vector vortex beam (VVB) in non-separable states where not only
+complex amplitude but also polarization are spatially structured and entangled
+with each other. In addition to the non-separability, the SAM and OAM in a VVB
+are intrinsically coupled by the optical spin-orbit interaction and constitute
+the profound spin-orbit physics in photonics. In this work, we present a
+comprehensive theoretical investigation, implemented on the first-principles
+base, of the intriguing light-matter interaction between VVBs and WSe$_{2}$
+monolayers (WSe$_{2}$-MLs), one of the best-known and promising two-dimensional
+(2D) materials in optoelectronics dictated by excitons, encompassing bright
+exciton (BX) as well as various dark excitons (DXs). One of the key findings of
+our study is the substantial enhancement of the photo-excitation of gray
+excitons (GXs), a type of spin-forbidden dark exciton, in a WSe$_2$-ML through
+the utilization of a twisted light that possesses a longitudinal field
+associated with the optical spin-orbit interaction. Our research demonstrates
+that a spin-orbit-coupled VVB surprisingly allows for the imprinting of the
+carried optical information onto gray excitons in 2D materials, which is robust
+against the decoherence mechanisms in materials. This observation suggests a
+promising method for deciphering the transferred angular momentum from
+structured lights to excitons.",2307.10916v1
+2016-01-20,Strongly enhanced Rashba splittings in oxide heterostructure: a tantalite monolayer on BaHfO$_3$,"In the two-dimensional electron gas (2DEG) emerging at the transition metal
+oxide surface and interface, it has been pointed out that the Rashba spin-orbit
+interaction, the momentum-dependent spin splitting due to broken inversion
+symmetry and atomic spin-orbit coupling, can have profound effects on
+electronic ordering in the spin, orbit, and charge channels, and may help give
+rise to exotic phenomena such as ferromagnetism-superconductivity coexistence
+and topological superconductivity. Although a large Rashba splitting is
+expected to improve experimental accessibility of such phenomena, it has not
+been understood how we can maximally enhance this splitting. Here, we present a
+promising route to realize significant Rashba-type band splitting using a thin
+film heterostructure. Based on first-principles methods and analytic model
+analyses, a tantalate monolayer on BaHfO$_3$ is shown to host two-dimensional
+bands originating from Ta $t_{2g}$ states with strong Rashba spin splittings -
+up to nearly 10% of the bandwidth - at both the band minima and saddle points
+due to the maximal breaking of the inversion symmetry. Such 2DEG band structure
+makes this oxide heterostructure a promising platform for realizing both a
+topological superconductor which hosts Majorana fermions and the electron
+correlation physics with strong spin-orbit coupling.",1601.05443v1
+2020-04-21,Role of interfacial oxidation in generation of spin-orbit torques,"We report that current-induced spin-orbit torques (SOTs) in
+heavy-metal/ferromagnetic-metal bilayers are strongly altered by the oxidation
+of the ferromagnetic layer near the interface. We measured damping-like (DL)
+and field-like (FL) SOTs for Pt/Co and Pt/Ni$_{81}$Fe$_{19}$ (Pt/Py) films
+using spin-torque ferromagnetic resonance. In the Pt/Co film, we found that the
+oxidation of the Co layer near the interface enhances both DL and FL SOTs in
+spite of the insulating nature of the CoO$_x$ layer. The enhancement of the
+SOTs disappears by inserting a thin Ti layer at the Pt/CoO$_x$ interface,
+indicating that the dominant source of the SOTs in the Pt/CoO$_x$/Co film is
+the spin-orbit coupling at the Pt/CoO$_x$ interface. In contrast to the
+Pt/CoO$_x$/Co film, the SOTs in the Pt/PyO$_x$/Py film are dominated by the
+bulk spin-orbit coupling. Our result shows that the interfacial oxidation of
+the Pt/Py film suppresses the DL-SOT and reverses the sign of the FL-SOT. The
+change of the SOTs can be attributed to the change of the real and imaginary
+parts of the spin mixing conductance induced by the insertion of the insulating
+PyO$_x$ layer. These results show that the interfacial oxidation provides an
+effective way to manipulate the strength and sign of the SOTs.",2004.09837v1
+2022-01-26,SOiCI and iCISO: Combining iterative configuration interaction with spin-orbit coupling in two ways,"The near-exact iCIPT2 approach for strongly correlated systems of electrons,
+which stems from the combination of iterative configuration interaction (iCI,
+an exact solver of full CI) with configuration selection for static correlation
+and second-order perturbation theory (PT2) for dynamic correlation, is extended
+to the relativistic domain. In the spirit of spin separation, relativistic
+effects are treated in two steps: scalar relativity is treated by the
+infinite-order, spin-free part of the exact two-component (X2C) relativistic
+Hamiltonian, whereas spin-orbit coupling (SOC) is treated by the first-order,
+Douglas-Kroll-Hess-like SOC operator derived from the same X2C Hamiltonian. Two
+possible combinations of iCIPT2 with SOC are considered, i.e., SOiCI and iCISO.
+The former treats SOC and electron correlation on an equal footing, whereas the
+latter treats SOC in the spirit of state interaction, by constructing and
+diagonalizing an effective spin-orbit Hamiltonian matrix in a small number of
+correlated scalar states. Both double group and time reversal symmetries are
+incorporated to simplify the computation. Pilot applications reveal that SOiCI
+is very accurate for the spin-orbit splitting (SOS) of heavy atoms, whereas the
+computationally very cheap iCISO can safely be applied to the SOS of light
+atoms and even of systems containing heavy atoms when SOC is largely quenched
+by ligand fields.",2201.10783v1
+2022-07-05,Revisiting Stellar Orbits and the Sgr A$^*$ Quadrupole Moment,"The ""no-hair"" theorem can, in principle, be tested at the center of the Milky
+Way by measuring the spin and the quadrupole moment of Sgr A$^*$ with the
+orbital precession of S-stars, measured over their full periods. Contrary to
+the original method, we show why it is possible to test the no-hair theorem
+using observations from only a single star, by measuring precession angles over
+a half-orbit. There are observational and theoretical reasons to expect S-stars
+to spin rapidly, and we have quantified the effect of stellar spin, via
+spin-curvature coupling (the leading-order manifestation of the
+Mathisson-Papapetrou-Dixon equations), on future quadrupole measurements. We
+find that they will typically suffer from errors of order a few percentage
+points, but for some orbital parameters, the error can be much higher. We
+re-examine the more general problem of astrophysical noise sources that may
+impede future quadrupole measurements, and find that a judicious choice of
+measurable precession angles can often eliminate individual noise sources. We
+have derived optimal combinations of observables to eliminate the large noise
+source of mass precession, the novel noise of spin-curvature coupling due to
+stellar spin, and the more complicated noise source arising from transient
+quadrupole moments in the stellar potential.",2207.02226v2
+2012-08-29,Modified Bethe-Peierls boundary condition for ultracold atoms with Spin-Orbit coupling,"We show that the Bethe-Peierls (BP) boundary condition should be modified for
+ultracold atoms with spin-orbit (SO) coupling. Moreover, we derive a general
+form of the modified BP boundary condition, which is applicable to a system
+with arbitrary kind of SO coupling. In the modified BP condition, an
+anisotropic term appears and the inter-atomic scattering length is normally
+SO-coupling dependent. For the special system in the current experiments,
+however, it can be proved that the scattering length is SO-coupling
+independent, and takes the same value as in the case without SO coupling. Our
+result is helpful for the study of both few-body and many-body physics in
+SO-coupled ultracold gases.",1208.5976v4
+2018-01-16,Harmonically trapped attractive and repulsive spin-orbit and Rabi coupled Bose-Einstein condensates,"Numerically we investigate the ground state of effective one-dimensional
+spin-orbit (SO) and Rabi coupled two pseudo-spinor Bose-Einstein condensates
+(BECs) under the effect of harmonic traps. For both signs of the interaction,
+density profiles of SO and Rabi coupled BECs in harmonic potentials, which
+simulate a real experimental situation are obtained. The harmonic trap causes a
+strong reduction of the multi-peak nature of the condensate and it increases
+its density. For repulsive interactions, the increase of SO coupling results in
+an uncompressed less dense condensate and with increased multi-peak nature of
+the density. The increase of Rabi coupling leads to a density increase with an
+almost constant number of multi-peaks. For both signs of the interaction and
+negative values of Rabi coupling, the condensate develops a notch in the
+central point and it seems to a dark-in-bright soliton. In the case of the
+attractive nonlinearity, an interesting result is the increase of the collapse
+threshold under the action of the SO and Rabi couplings.",1801.05321v1
+2021-04-06,Supersolid-like states in a two-dimensional trapped spin-orbit-coupled spin-1 condensate,"We study supersolid-like states in a quasi-two-dimensional trapped Rashba and
+Dresselhaus spin-orbit (SO) coupled spin-1 condensate. For small strengths of
+SO coupling $\gamma$ ($\gamma \lessapprox 0.75$), in the ferromagnetic phase,
+circularly-symmetric $(0,\pm 1, \pm 2)$- and $(\mp 1, 0,\pm 1)$-type states are
+formed where the numbers in the parentheses denote the angular momentum of the
+vortex at the center of the components and where the upper (lower) sign
+correspond to Rashba (Dresselhaus) coupling; in the antiferromagnetic phase,
+only $(\mp 1, 0,\pm 1)$-type states are formed. For large strengths of SO
+coupling, supersolid-like superlattice and superstripe states are formed in the
+ferromagnetic phase. In the antiferromagnetic phase, for large strengths of SO
+coupling, supersolid-like superstripe and multi-ring states are formed. For an
+equal mixture of Rashba and Dresselhaus SO couplings, only a superstripe state
+is found. All these states are found to be dynamically stable and hence
+accessible in an experiment and will enhance the fundamental understanding of
+crystallization onto spatially periodic states in solids.",2104.02197v1
+2015-12-29,Prediction of spin orientations in terms of HOMO-LUMO interactions using spin-orbit coupling as perturbation,"The preferred spin orientation of a magnetic ion can be predicted on the
+basis of density functional theory (DFT) calculations including electron
+correlation and spin-orbit coupling (SOC). However, most chemists and
+physicists are unaware of how the observed and/or calculated spin orientations
+are related to the local electronic structures of the magnetic ions. The
+objective of this article is to provide a conceptual framework of thinking
+about and predicting the preferred spin orientation of a magnetic ion by
+examining the relationship between the spin orientation and the local
+electronic structure of the ion. In general, a magnetic ion (i.e., an ion
+possessing unpaired spins) in a solid or a molecule is surrounded with
+main-group ligand atoms to form a polyhedron, and the d-states of the
+polyhedron are split because the antibonding interactions of the metal
+d-orbitals with the p orbitals of the surrounding ligands depend on the
+symmetries of the orbitals involved. The magnetic ion of the polyhedron has a
+certain preferred spin direction because its split d-states interact among
+themselves under SOC and because the energy lowering associated with the
+SOC-induced interactions depends on spin orientation. The preferred spin
+direction can be readily predicted on the basis of perturbation theory, in
+which the SOC is taken as perturbation and the split d-states as unperturbed
+states, by inspecting the magnetic quantum numbers of its d-orbitals present in
+the HOMO and LUMO of the polyhedron. Experimentally, the determination of the
+preferred spin orientations of magnetic ions requires a sophisticated level of
+experiments. Theoretically, it requires an elaborate level of DFT electronic
+structure calculations. We show that the outcomes of such experimental
+measurements and theoretical calculations can be predicted by a simple
+perturbation theory analysis.",1512.08573v1
+2012-11-12,An orbital-selective spin liquid in a frustrated heavy fermion spinel LiV$_2$O$_4$,"The pronounced enhancement of the effective mass is the primary phenomenon
+associated with strongly correlated electrons. In the presence of local
+moments, the large effective mass is thought to arise from Kondo coupling, the
+interaction between itinerant and localised electrons. However, in d electron
+systems, the origin is not clear because of the competing Hund's rule coupling.
+Here we experimentally address the microscopic origin for the heaviest d
+fermion in a vanadium spinel LiV2O4 having geometrical frustration. Utilising
+orbital-selective 51V NMR, we elucidate the orbital-dependent local moment that
+exhibits no long-range magnetic order despite persistent antiferromagnetic
+correlations. A frustrated spin liquid, Hund-coupled to itinerant electrons,
+has a crucial role in forming heavy fermions with large residual entropy. Our
+method is important for the microscopic observation of the orbital-selective
+localisation in a wide range of materials including iron pnictides, cobaltates,
+manganites, and ruthnates.",1211.2844v1
+2014-02-05,Theoretical study of insulating mechanism in multi-orbital Hubbard models with a large spin-orbit coupling: Slater versus Mott scenario in Sr$_2$IrO$_4$,"To examine the insulating mechanism of 5$d$ transition metal oxide
+Sr$_2$IrO$_4$, we study the ground state properties of a three-orbital Hubbard
+model with a large relativistic spin-orbit coupling on a square lattice. Using
+a variational Monte Carlo method, we find that the insulating state appearing
+in the ground state phase diagram for one hole per site varies from a weakly
+correlated to a strongly correlated antiferromagnetic (AF) state with
+increasing Coulomb interactions. This crossover is characterized by the
+different energy gain mechanisms of the AF insulating state, i.e., from an
+interaction-energy driven Slater-type insulator to a band-energy driven
+Mott-type insulator with increasing Coulomb interactions. Our calculations
+reveal that Sr$_2$IrO$_4$ is a ""moderately correlated"" AF insulator located in
+the intermediate coupling region between a Slater-type and a Mott-type
+insulators.",1402.0935v2
+2015-09-04,Slope-Reversed Mott Transition in Multiorbital Systems,"We examine finite-temperature phase transitions in the two-orbital Hubbard
+model with different bandwidths by means of the dynamical mean-field theory
+combined with the continuous-time quantum Monte Carlo method. It is found that
+there emerges a peculiar slope-reversed first-order Mott transition between the
+orbital-selective Mott phase and the Mott insulator phase in the presence of
+Ising-type Hund's coupling. The origin of the slope-reversed phase transition
+is clarified by the analysis of the temperature dependence of the energy
+density. It turns out that the increase of Hund's coupling lowers the critical
+temperature of the slope-reversed Mott transition. Beyond a certain critical
+value of Hund's coupling the first-order transition turns into a
+finite-temperature crossover. We also reveal that the orbital-selective Mott
+phase exhibits frozen local moments in the wide orbital, which is demonstrated
+by the spin-spin correlation functions.",1509.01415v1
+2014-05-12,Orbital ferromagnetism in interacting few-electron dots with strong spin-orbit coupling,"We study the ground state of $N$ weakly interacting electrons (with $N\le
+10$) in a two-dimensional parabolic quantum dot with strong Rashba spin-orbit
+coupling. Using dimensionless parameters for the Coulomb interaction,
+$\lambda\lesssim 1$, and the Rashba coupling, $\alpha\gg 1$, the low-energy
+physics is characterized by an almost flat single-particle dispersion. From an
+analytical approach for $\alpha\to \infty$ and $N=2$, and from numerical exact
+diagonalization and Hartree-Fock calculations, we find a transition from a
+conventional unmagnetized ground state (for $\lambda<\lambda_c$) to an orbital
+ferromagnet (for $\lambda>\lambda_c$), with a large magnetization and a
+circulating charge current. We show that the critical interaction strength,
+$\lambda_c=\lambda_c(\alpha,N)$, vanishes in the limit $\alpha\to \infty$.",1405.2675v2
+2024-02-10,A spin-torque nano-oscillator based on interlayer-coupled meron-skyrmion pairs with a fixed orbit,"In recent years, magnetic skyrmion-based spin-torque nano-oscillators (STNOs)
+attract considerable interest for their prospect in future-generation
+communication and spintronic technologies. However, some critical issues, which
+hamper their practical applications, e.g., the long start-up time and variable
+skyrmion gyration orbit, remain to be resolved. Here, we numerically
+demonstrate a realization of a fixed-orbit STNO, which is based on an
+interlayer-coupled meron-skyrmion (MS) pair other than a magnetic skyrmion. In
+this STNO, the MS pair possesses a structurally defined, fixed orbit within a
+broad range of driving current, even in the presence of random defects. The
+output frequency range of the STNO based on an MS pair far exceeds that of the
+STNO typically based on a single skyrmion. Moreover, the output frequency of
+this STNO can be further elevated if more MS pairs are incorporated. Our
+results reveal the nontrivial dynamics of the interlayer-coupled MS pair,
+opening perspectives for the design and optimization of fundamental spintronic
+devices.",2402.06865v1
+2014-08-19,Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains,"We consider the non-equilibrium dynamics of a driven dissipative spin chain
+with chiral coupling to a 1D bosonic bath, and its atomic implementation with a
+two-species mixture of cold quantum gases. The reservoir is represented by a
+spin-orbit coupled 1D quasi-condensate of atoms in a magnetized phase, while
+the spins are identified with motional states of a separate species of atoms in
+an optical lattice. The chirality of reservoir excitations allows the spins to
+couple differently to left and right moving modes, which in our atomic setup
+can be tuned from bidirectional to purely unidirectional. Remarkably, this
+leads to a pure steady state in which pairs of neighboring spins form dimers
+that decouple from the remainder of the chain. Our results also apply to
+current experiments with two-level emitters coupled to photonic waveguides.",1408.4357v3
+2016-09-12,Anomalous hyperfine coupling and nuclear magnetic relaxation in Weyl semimetals,"The electron-nuclear hyperfine interaction shows up in a variety of phenomena
+including e.g. NMR studies of correlated states and spin decoherence effects in
+quantum dots. Here we focus on the hyperfine coupling and the NMR spin
+relaxation time, $T_1$ in Weyl semimetals. Since the density of states in Weyl
+semimetals varies with the square of the energy around the Weyl point, a naive
+power counting predicts a $1/T_1T\sim E^4$ scaling with $E$ the maximum of
+temperature ($T$) and chemical potential. By carefully investigating the
+hyperfine interaction between nuclear spins and Weyl fermions, we find that
+while its spin part behaves conventionally, its orbital part diverges unusually
+with the inverse of energy around the Weyl point. Consequently, the nuclear
+spin relaxation rate scales in a graphene like manner as $1/T_1T\sim
+E^2\ln(E/\omega_0)$ with $\omega_0$ the nuclear Larmor frequency. This allows
+us to identify an effective hyperfine coupling constant, which is tunable by
+gating or doping, which is relevant for decoherence effect in spintronics
+devices and double quantum dots where hyperfine coupling is the dominant source
+of spin-blockade lifting.",1609.03370v1
+2010-08-06,First-principle studies of spin-electric coupling in a $\{Cu_3\}$ single molecular magnet,"We report on a study of the electronic and magnetic properties of the
+triangular antiferromagnetic $\{Cu_3\}$ single-molecule magnet, based on spin
+density functional theory. Our calculations show that the low-energy magnetic
+properties are correctly described by an effective three-site spin $s=1/2$
+Heisenberg model, with an antiferromagnetic exchange coupling $J \approx 5$
+meV. The ground state manifold of the model is composed of two degenerate spin
+$S=1/2$ doublets of opposite chirality. Due to lack of inversion symmetry in
+the molecule these two states are coupled by an external electric field, even
+when spin-orbit interaction is absent. The spin-electric coupling can be viewed
+as originating from a modified exchange constant $\delta J$ induced by the
+electric field. We find that the calculated transition rate between the chiral
+states yields an effective electric dipole moment $d = 3.38\times 10^{-33} {\rm
+C\ m} \approx e 10^{-4}a$, where $a$ is the Cu separation. For external
+electric fields ${{\varepsilon}} \approx 10^8$ V/m this value corresponds to a
+Rabi time $\tau \approx 1$ ns and to a $\delta J$ of the order of a few
+$\mu$eV.",1008.1139v1
+2009-12-18,"""Nonmagnetic"" Dimer Mott insulator induced by the coupling of spin with quantum electric dipoles","We present an effective dipolar-spin model based on the strong coupling
+analysis, which may explain the possible origin of the ""spin liquid Mott
+insulator"". The issue is related to the dimer Mott insulator reminiscent of the
+organic triangular lattice system, $\kappa$-ET$_2$Cu$_2$(CN)$_3$, whose gapless
+spin liquid state had been discussed in the context of geometrical frustration
+of exchange coupling, $J$, between spins on dimer orbitals. It turns out that
+another degrees of freedom within the insulator, {\it quantum electric-dipoles}
+on dimers, interacts with each other by the Coulomb interaction and brings
+about a significant suppression of $J$ through the dipolar-spin coupling.",0912.3674v3
+2017-09-03,Nanoscale chiral valley-photon interface through optical spin-orbit coupling,"The emergence of two-dimensional transition metal chalcogenide materials has
+sparked an intense activity in valleytronics since their valley information can
+be directly encoded and detected by using the spin angular momentum of light.
+For their practical applications such as on-chip valley logic gates and
+chip-to-chip valley transport, the encoding and processing of valley pseudospin
+using light should be extended to an integrated, on-chip nanophotonic system.
+Here, we successfully demonstrate, at room temperature, the valley-dependent
+directional coupling of light using a plasmonic nanowire-WS2 layers system. Our
+calculations show that the local transverse spin angular momentum of the mode
+of the plasmonic nanowire provides robust optical spin-path locking of up to 91
+%. Experimentally we demonstrate that valley pseudospin in WS2 is coupled with
+optical spin of the same handedness and exhibits a high directional coupling
+efficiency up to 90 % to the plasmonic guided mode. The result opens up new
+avenues of controlling, detecting and processing valley and spin information
+with precise optical control at the nanoscale.",1709.00762v1
+2021-05-25,Robust exceptional point of arbitrary order in coupled spinning cylinders,"Exceptional points (EPs), i.e., non-Hermitian degeneracies at which
+eigenvalues and eigenvectors coalesce, can be realized by tuning the gain/loss
+contrast of different modes in non-Hermitian systems or by engineering the
+asymmetric coupling of modes. Here we demonstrate a mechanism that can achieve
+EPs of arbitrary order by employing the non-reciprocal coupling of spinning
+cylinders sitting on a dielectric waveguide. The spinning motion breaks the
+time-reversal symmetry and removes the degeneracy of opposite chiral modes of
+the cylinders. Under the excitation of a linearly polarized plane wave, the
+chiral mode of one cylinder can unidirectionally couple to the same mode of the
+other cylinder via the spin-orbit interaction associated with the evanescent
+wave of the waveguide. The structure can give rise to arbitrary-order EPs that
+are robust against spin-flipping perturbations, in contrast to conventional
+systems relying on spin-selective excitations. In addition, we show that
+higher-order EPs in the proposed system are accompanied by enhanced optical
+isolation, which may find applications in designing novel optical isolators,
+nonreciprocal optical devices, and topological photonics.",2105.11629v1
+2001-07-01,Coupling and Dissociation in Artificial Molecules,"We show that the spin-and-space unrestricted Hartree-Fock method, in
+conjunction with the companion step of the restoration of spin and space
+symmetries via Projection Techniques (when such symmetries are broken), is able
+to describe the full range of couplings in two-dimensional double quantum dots,
+from the strong-coupling regime exhibiting delocalized molecular orbitals to
+the weak-coupling and dissociation regimes associated with a Generalized
+Valence Bond combination of atomic-type orbitals localized on the individual
+dots. The weak-coupling regime is always accompanied by an antiferromagnetic
+ordering of the spins of the individual dots. The cases of dihydrogen (H$_2$,
+$2e$) and dilithium (Li$_2$, $6e$) quantum dot molecules are discussed in
+detail.",0107014v1
+2013-03-24,Synthetic Gauge Field with Highly Magnetic Lanthanide Atoms,"We present a scheme for generating a synthetic magnetic field and spin-orbit
+coupling via Raman coupling in highly magnetic lanthanide atoms such as
+dysprosium. Employing these atoms offer several advantages for realizing
+strongly correlated states and exotic spinor phases. The large spin and narrow
+optical transitions of these atoms allow the generation of synthetic magnetic
+fields an order of magnitude larger than those in the alkalis, but with
+considerable reduction of the heating rate for equal Raman coupling. The
+effective hamiltonian of these systems differs from that of the alkalis' by an
+additional nematic coupling term, which leads to a phase transition in the
+dressed states as detuning varies. For \text{high-spin} condensates, spin-orbit
+coupling leads to a spatially periodic structure, which is described in
+Majorana representation by a set of points moving periodically on a unit
+sphere. We name this a ""Majorana spinor helix"" in analogy to the persistent
+spin-1/2 helix observed in electronic systems.",1303.6004v1
+2019-10-14,Intrinsic Rashba coupling due to Hydrogen bonding in DNA,"We present an analytical model for the role of hydrogen bonding on the
+spin-orbit coupling of model DNA molecule. Here we analyze in detail the
+electric fields due to the polarization of the Hydrogen bond on the DNA base
+pairs and derive, within tight binding analytical band folding approach, an
+intrinsic Rashba coupling which should dictate the order of the spin active
+effects in the Chiral-Induced Spin Selectivity (CISS) effect. The coupling
+found is ten times larger than the intrinsic coupling estimated previously and
+points to the predominant role of hydrogen bonding in addition to chirality in
+the case of biological molecules. We expect similar dominant effects in
+oligopeptides, where the chiral structure is supported by hydrogen-bonding and
+bears on orbital carrying transport electrons.",1910.05985v1
+2020-12-02,Spontaneous spatial order in two-dimensional ferromagnetic spin-orbit coupled uniform spin-1 condensate solitons,"We demonstrate spontaneous spatial order in stripe and super-lattice solitons
+in a Rashba spin-orbit (SO) coupled spin-1 uniform quasi-two-dimensional
+(quasi-2D) ferromagnetic Bose-Einstein condensate. For weak SO coupling, the
+solitons are of the $(- 1,0,+ 1)$ or $(0,+ 1,+ 2)$ type with intrinsic
+vorticity, where the numbers in the parentheses denote angular momentum in spin
+components $F_z=+1,0,-1$, respectively. For intermediate SO coupling, three
+types of solitons are found: (a) circularly-asymmetric solitons, (b)
+circularly-symmetric $(- 1,0,+ 1)$- and (c) $(0,+ 1,+ 2)$-type multi-ring
+solitons maintaining the above-mentioned vortices in respective components. For
+large SO coupling, quasi-degenerate stripe and super-lattice solitons are found
+in addition to the circularly-asymmetric solitons. A super-lattice soliton
+forms a 2D square lattice structure in the total density as in a super-solid;
+in component densities it may have either (i) a 1D stripe pattern or (ii) a 2D
+square lattice structure.",2012.01197v1
+2010-12-21,Kondo effects and shot noise enhancement in a laterally coupled double quantum dot,"The spin and orbital Kondo effects and the related shot noise for a laterally
+coupled double quantum dot are studied taking account of coherent indirect
+coupling via a reservoir. We calculate the linear conductance and shot noise
+for various charge states to distinguish between the spin and orbital Kondo
+effects. We find that a novel antiferromagnetic exchange coupling can be
+generated by the coherent indirect coupling, and it works to suppress the spin
+Kondo effect when each quantum dot holds just one electron. We also show that
+we can capture the feature of the pseudospin Kondo effect from the shot noise
+measurement.",1012.4838v1
+2012-11-29,Scattering and effective interactions of ultracold atoms with spin-orbit coupling,"We derive an analytical expression for the scattering amplitude of two
+ultracold atoms of arbitrary spin and with general spin-orbit (SO) coupling, on
+the basis of our recent work (Phys. Rev. A \textbf{86}, 053608 (2012)). As an
+application, we demonstrate that SO coupling can induce scattering resonance in
+the case with finite scattering length. The same approach can be applied to
+calculate the two-body bound state of SO-coupled ultracold atoms. For the
+ultracold spin-1/2 fermi gases in three- or two- dimensional systems with SO
+coupling, we also obtain the renormalization relation of effective contact
+interaction with momentum cutoff, as well as the applicability of Huang-Yang
+pseudo-potential.",1211.6919v7
+2023-04-18,Dispersion engineering in spin-orbit coupled spinor $F=1$ condensates driven by negative masses,"In this paper, we bring out several potential signatures of negative mass
+regimes while investigating an expanding spin-orbit (SO) coupled spinor $F=1$
+Bose-Einstein condensates by analyzing the dispersion relation of the
+single-particle quantum system. In SO-coupled spinor condensates, a negative
+mass parameter generates a wave packet that propagates in the opposite
+direction of the momentum. We analyze the dynamics of spin waves analytically
+and present a simple approach to investigate the expansion of spinor
+condensates. In particular, we examine the dynamics when both masses are
+negative, which results in the spinor condensates splitting into two
+counter-propagating self-interfering packets (SIPs). Using numerical
+simulations of the coupled Gross-Pitaevskii equations, we demonstrate the
+density expansion and self-interference patterns with and without magnetization
+for repulsive and attractive interactions with different coupling parameters.
+The highlight of our investigation is that we are able to unearth several
+phenomena observed in experiments, such as self-interfering packets, pileup,
+modulation instability, slow down, self-trapping, and gap solitons. In
+particular, the gap soliton exists at the gap created by the intersection of
+two negative masses.",2304.08844v2
+2009-05-13,Exciting the Scissors Mode in crystals with strong spin-orbit coupling as in Bose-Einstein Condensates,"In a recent study of the magnetic properties of rare-earth systems the two
+extreme situations have been considered in which the crystalline electrostatic
+field is large or small with respect to the spin-orbit interaction. In the
+first case the orbitals of localized electrons are firmly coupled to the
+lattice so that while an applied magnetic field rotates the spin, the charge
+profile remains fixed to the lattice. In the second case an applied magnetic
+field rotates both spin and density profile, even though through a very small
+angle. We show that in this second case we have, in addition to the use of
+photons or electrons, the possibility of exciting and observing the Scissors
+Mode in crystals in a way analogous to that used in Bose-Einstein Condensates.",0905.2100v2
+2010-03-11,Spin-orbit excitations of quantum wells,"Confinement asymmetry effects on the photoabsorption of a quantum well are
+discussed by means of a sum-rules approach using a Hamiltonian including a
+Rashba spin-orbt coupling. We show that while the strength of the excitation is
+zero when the spin-orbit coupling is neglected, the inclusion of the spin-orbit
+interaction gives rise to a non zero strength and mean excitation energy in the
+far-infrared region. A simple expression for these quantities up to the second
+order in the Rashba parameter was derived. The effect of two-body Coulomb
+interaction is then studied by means of a Quantum Monte Carlo calculation,
+showing that electron-electron correlations induce only a small deviation from
+the independent particle model result.",1003.2433v1
+2010-06-11,Exchange cotunneling through quantum dots with spin-orbit coupling,"We investigate the effects of spin-orbit interaction (SOI) on the exchange
+cotunneling through a spinful Coulomb blockaded quantum dot. In the case of
+zero magnetic field, Kondo effect is shown to take place via a Kramers doublet
+and the SOI will merely affect the Kondo temperature. In contrast, we find that
+the breaking of time-reversal symmetry in a finite field has a marked influence
+on the effective Anderson, and Kondo models for a single level. The nonlinear
+conductance can now be asymmetric in bias voltage and may depend strongly on
+direction of the magnetic field. A measurement of the angle dependence of
+finite-field cotunneling spectroscopy thus provides valuable information about
+orbital, and spin degrees of freedom and their mutual coupling.",1006.2371v1
+2010-09-28,Singlet-triplet avoided crossings and effective $g$ factor versus spatial orientation of spin-orbit-coupled quantum dots,"We study avoided crossings opened by spin-orbit interaction in the energy
+spectra of one- and two-electron anisotropic quantum dots in perpendicular
+magnetic field. We find that for simultaneously present Rashba and Dresselhaus
+interactions the width of avoided crossings and the effective $g$ factor depend
+on the dot orientation within (001) crystal plane. The extreme values of these
+quantities are obtained for [110] and [1$\bar{1}$0] orientations of the dot.
+The width of singlet-triplet avoided crossing changes between these two
+orientations by as much as two orders of magnitude. The discussed modulation
+results from orientation-dependent strength of the Zeeman interaction which
+tends to polarize the spins in the direction of the external magnetic field and
+thus remove the spin-orbit coupling effects.",1009.5637v1
+2011-08-04,Condensate fraction of a resonant Fermi gas with spin-orbit coupling in three and two dimensions,"We study the effects of laser-induced Rashba-like spin-orbit coupling along
+the BCS-BEC crossover of a Feshbach resonance for a two-spin-component Fermi
+gas. We calculate the condensate fraction in three and two dimensions and find
+that this quantity characterizes the crossover better than other quantities,
+like the chemical potential or the pairing gap. By considering both the singlet
+and the triplet pairings, we calculate the condensate fraction and show that a
+large enough spin-orbit interaction enhances the singlet condensate fraction in
+the BCS side while suppressing it on the BEC side.",1108.1132v3
+2011-10-04,Rashba spin-orbit coupled atomic Fermi gases,"We investigate theoretically BEC-BCS crossover physics in the presence of a
+Rashba spin-orbit coupling in a system of two-component Fermi gas with and
+without a Zeeman field that breaks the population balance between the two
+components. A new bound state (Rashba pair) emerges because of the spin-orbit
+interaction. We study the properties of Rashba pairs using a standard pair
+fluctuation theory. At zero temperature, the Rashba pairs condense into a
+macroscopic mixed spin state. We discuss in detail the experimental signatures
+for observing the condensation of Rashba pairs by calculating various physical
+observables which characterize the properties of the system and can be measured
+in experiment.",1110.0805v1
+2012-09-13,The Hubbard model with spin orbit coupling: a lattice gauge theory approach,"We study the symmetry properties of the Hubbard model with spin-orbit
+interactions of Rashba and Dresselhaus type. These interactions break the
+rotational symmetry in spin space, so that the magnetic order cannot be
+excluded by using the Bogoliubov inequality method. Nevertheless, we rigorously
+show that the existence of the magnetic long-range orders may be ruled out when
+the Rashba and Dresselhaus coupling constants are equal in modulus, whereas the
+eta-pairing can be always ruled out, regardless of the microscopic parameters
+of the model. These results are obtained by imposing locally the SU(2) gauge
+symmetry on the lattice, and rewriting the spin-orbit interactions in such a
+way that they are included in the path ordered of the gauge field on lattice.",1209.2844v1
+2012-09-28,Theory of spin-orbit enhanced electric-field control of magnetism in multiferroic BiFeO3,"We present a microscopic theory that shows the importance of spin-orbit
+coupling in perovskite compounds with heavy ions. In BiFeO3 (BFO) the
+spin-orbit coupling at the bismuth ion sites results in a special kind of
+magnetic anisotropy that is linear in the applied E-field. This interaction can
+convert the cycloid ground state into a homogeneous antiferromagnet, with a
+weak ferromagnetic moment whose orientation can be controlled by the E-field
+direction. Remarkably, the E-field control of magnetism occurs without poling
+the ferroelectric moment, providing a pathway for reduced energy dissipation in
+spin-based devices made of insulators.",1209.6612v4
+2013-06-05,Chiral Ladders and the Edges of Chern Insulators,"The realization and detection of topological phases with ultracold atomic
+gases is at the frontier of current theoretical and experimental research.
+Here, we identify cold atoms in optical ladders subjected to synthetic magnetic
+fields as readily realizable bridges between one-dimensional spin-orbit (time
+reversal) topological insulators and two-dimensional Chern insulators. We
+reveal three instances of their promising potential: i) they realize spin-orbit
+coupling, with the left-right leg degree of freedom playing the role of an
+effective spin, ii) their energy bands and eigenstates exactly reproduce the
+topological chiral edge modes of two-dimensional Chern insulators, and iii)
+they can be tailored to realize a topological phase transition from a trivial
+to a topological insulating phase. We propose realistic schemes to observe the
+chiral and topological properties of ladder systems with current optical
+lattice-based experiments. Our findings open a door to the exploration of the
+physics of the edges of Chern insulators and to the realization of spin-orbit
+coupling and topological superfluid phases with ultracold atomic gases.",1306.1190v1
+2013-10-28,Interaction-Tuned Dynamical Transitions in a Rashba Spin-Orbit Coupled Fermi Gas,"We consider the time evolution of the magnetization in a Rashba
+spin-orbit-coupled Fermi gas, starting from a fully-polarized initial state. We
+model the dynamics using a Boltzmann equation, which we solve in the
+Hartree-Fock approximation. The resulting non-linear system of equations gives
+rise to three distinct dynamical regimes with qualitatively different
+asymptotic behaviors of the magnetization at long times. The distinct regimes
+and the transitions between them are controlled by the interaction strength:
+for weakly interacting fermions, the magnetization decays to zero. For
+intermediate interactions, it displays undamped oscillations about zero and for
+strong interactions, a partially magnetized state is dynamically stabilized.
+The dynamics we find is a spin analog of interaction induced self-trapping in
+double-well Bose Einstein condensates. The predicted phenomena can be realized
+in trapped Fermi gases with synthetic spin-orbit interactions.",1310.7639v1
+2014-04-23,Effect of spin orbit coupling and Hubbard $U$ on the electronic structure of IrO$_2$,"We have studied in detail the electronic structure of IrO$_2$ including
+spin-orbit coupling (SOC) and electron-electron interaction, both within the
+GGA+U and GGA+DMFT approximations. Our calculations reveal that the Ir t$_{2g}$
+states at the Fermi level largely retain the J$_{\rm eff}$ = $\frac{1}{2}$
+character, suggesting that this complex spin-orbit entangled state may be
+robust even in metallic IrO$_2$. We have calculated the phase diagram for the
+ground state of IrO$_2$ as a function of $U$ and find a metal insulator
+transition that coincides with a magnetic phase change, where the effect of SOC
+is only to reduce the critical values of $U$ necessary for the transition. We
+also find that dynamic correlations, as given by the GGA+DMFT calculations,
+tend to suppress the spin-splitting, yielding a Pauli paramagnetic metal for
+moderate values of the Hubbard $U$. Our calculated optical spectra and
+photoemission spectra including SOC are in good agreement with experiment
+demonstrating the importance of SOC in IrO$_2$.",1404.5991v1
+2015-11-10,Electronic structure and spin-orbit driven novel magnetism in d4.5 insulator Ba3YIr2O9,"We have carried out a detailed first-principles study of a d$^{4.5}$
+quaternary iridate Ba$_3$YIr$_2$O$_9$ both in its 6H-perovskite-type ambient
+pressure (AP) phase and also for the high pressure (HP) cubic phase. Our
+analysis reveals that the AP phase belongs to the intermediate spin-orbit
+coupling (SOC) regime. This is further supported by the identification of the
+spin moment as the primary order parameter (POP) obtained from a magnetic
+multipolar analysis. The large $t_{2g}$ band width renormalizes the strength of
+SOC and the Ir intersite exchange interaction dominates resulting in long range
+magnetic order in the AP phase. In addition to SOC and Hubbard $U$, strong
+intradimer coupling is found to be crucial for the realization of the
+insulating state. At high pressure (HP) the system undergoes a structural
+transformation to the disordered cubic phase. In sharp contrast to the AP
+phase, the calculated exchange interactions in the HP phase are found to be
+much weaker and SOC dominates leading to a quantum spin orbital liquid (SOL)
+state.",1511.03112v1
+2010-05-07,Tuning independently Fermi energy and spin splitting in Rashba systems: Ternary surface alloys on Ag(111),"By detailed first-principles calculations we show that the Fermi energy and
+the Rashba splitting in disordered ternary surface alloys (BiPbSb)/Ag(111) can
+be independently tuned by choosing the concentrations of Bi and Pb. The
+findings are explained by three fundamental mechanisms, namely the relaxation
+of the adatoms, the strength of the atomic spin-orbit coupling, and band
+filling. By mapping the Rashba characteristics,i.e.the splitting and the Rashba
+energy, and the Fermi energy of the surface states in the complete range of
+concentrations. Our results suggest to investigate experimentally effects which
+rely on the Rashba spin-orbit coupling in dependence on spin-orbit splitting
+and band filling.",1005.1162v1
+2017-01-02,Rashba spin-orbit interaction enhanced by graphene in-plane deformations,"Graphene consists in a single-layer carbon crystal where 2$p_z$ electrons
+display a linear dispersion relation in the vicinity of the Fermi level,
+conveniently described by a massless Dirac equation in $2+1$ spacetime.
+Spin-orbit effects open a gap in the band structure and offer perspectives for
+the manipulation of the conducting electrons spin. Ways to manipulate
+spin-orbit couplings in graphene have been generally assessed by proximity
+effects to metals that do not compromise the mobility of the unperturbed system
+and are likely to induce strain in the graphene layer. In this work we explore
+the $\rm{U(1)}\times SU(2)$ gauge fields that result from the uniform
+stretching of a graphene sheet under a perpendicular electric field.
+Considering such deformations is particularly relevant due to the
+counter-intuitive enhancement of the Rashba coupling between 30-50% for small
+bond deformations well known from tight-binding and DFT calculations. We report
+the accessible changes that can be operated in the band structure in the
+vicinity of the K points as a function of the deformation strength and
+direction.",1701.00363v2
+2018-05-25,"Calculating the transport properties of magnetic materials from first-principles including thermal and alloy disorder, non-collinearity and spin-orbit coupling","A density functional theory based two-terminal scattering formalism that
+includes spin-orbit coupling and spin non-collinearity is described. An
+implementation using tight-binding muffin-tin orbitals combined with extensive
+use of sparse matrix techniques allows a wide variety of inhomogeneous
+structures to be flexibly modelled with various types of disorder including
+temperature induced lattice and spin disorder. The methodology is illustrated
+with calculations of the temperature dependent resistivity and magnetization
+damping for the important substitutional disordered magnetic alloy Permalloy
+(Py), Ni$_{80}$Fe$_{20}$. Comparison of calculated results with recent
+experimental measurements of the damping (including its temperature dependence)
+indicates that the scattering approach captures the most important
+contributions to this important property.",1805.10062v1
+2013-09-24,Noncompact dynamical symmetry of a spin-orbit coupled oscillator,"We explain the finite as well as infinite degeneracy in the spectrum of a
+particular system of spin-1/2 fermions with spin-orbit coupling in three
+spatial dimensions. Starting from a generalized Runge-Lenz vector, we
+explicitly construct a complete set of symmetry operators, which span a
+noncompact SO(3,2) algebra. The degeneracy of the physical spectrum only
+involves a particular, infinite, so called singleton representation. In the
+branch where orbital and spin angular momentum are aligned the full
+representation appears, constituting a 3D analogue of Landau levels.
+Anti-aligning the spin leads to a finite degeneracy due to a truncation of the
+singleton representation. We conclude the paper by constructing the spectrum
+generating algebra of the problem.",1309.6128v2
+2014-05-06,Magnetic and transport signatures of Rashba spin-orbit coupling on the ferromagnetic Kondo lattice model in two dimensions,"Motivated by emergent phenomena at oxide surfaces and interfaces,
+particularly those involving transition metal oxides with perovskite crystal
+structure such as LaTiO3/SrTiO3, we examine the ferromagnetic Kondo lattice
+model (FKLM) in the presence of a Rashba spin-orbit coupling (RSOC). Using
+numerical techniques, under the assumption that the electrons on localized
+orbitals may be treated as classical continuum spins, we compute various
+charge, spin and transport properties on square clusters at zero temperature.
+We find that the main effect of the RSOC is the destruction of the
+ferromagnetic state present in the FKLM at low electron fillings, with the
+consequent suppression of conductivity. In addition, near half-filling the RSOC
+leads to a departure of the antiferromagnetic state of the FKLM with a
+consequent reduction to the intrinsic tendency to electronic phase separation.
+The interplay between phase separation on one side, and magnetic and transport
+properties on the other, is carefully analyzed as a function of the
+RSOC/hopping ratio.",1405.1240v2
+2017-10-10,Magnetic spin-orbit interaction directs Bloch surface waves,"We study the directional excitation of optical surface waves controlled by
+the magnetic field of light. We theoretically predict that a spinning magnetic
+dipole develops a tunable unidirectional coupling of light to TE-polarized
+Bloch surface waves (BSWs). Experimentally, we show that the helicity of light
+projected onto a subwavelength groove milled in the top layer of a 1D photonic
+crystal (PC) controls the power distribution between two TE-polarized BSWs
+excited on both sides of the groove. Such a phenomenon is shown to be mediated
+solely by the helicity of the magnetic field of light, thus revealing a
+magnetic spin-orbit interaction. Remarkably, this magnetic optical effect is
+clearly observed with a near-field coupler governed by an electric dipole
+moment: it is of the same order of magnitude as the electric optical effects
+involved in the coupling. The magnetic spin-orbit interaction opens new degrees
+of freedom in the manipulation of light and offers appealing novel
+opportunities in the development of integrated optical functionalities.",1710.03584v2
+2018-01-11,Designing Nanomagnet Arrays for Topological Nanowires in Si,"Recent interest in topological quantum computing has driven research into
+topological nanowires, one-dimensional quantum wires that support topological
+modes including Majorana fermions. Most topological nanowire designs rely on
+materials with strong spin-orbit coupling, such as InAs or InSb, used in
+combination with superconductors. It would be advantageous to fabricate
+topological nanowires using Si owing to its mature technology. However, the
+intrinsic spin-orbit coupling in Si is weak. One approach that could circumvent
+this material deficiency is to rotate the electron spins using nanomagnets.
+Here, we perform detailed simulations of realistic Si/SiGe systems with an
+artificial spin-orbit gap induced by a nanomagnet array. Most of our results
+are also generalizable to other nanomagnet-based topological nanowire designs.
+By studying several concrete examples, we gain insight into the effects of
+nanomagnet arrays, leading to design rules and guidelines. Finally, we present
+an experimentally realizable design using magnets with a single polarization.",1801.03676v1
+2018-01-30,Quantum ring with the Rashba spin-orbit interaction in the regime of strong light-matter coupling,"We developed the theory of electronic properties of semiconductor quantum
+rings with the Rashba spin-orbit interaction irradiated by an off-resonant
+high-frequency electromagnetic field (dressing field). Within the Floquet
+theory of periodically driven quantum systems, it is demonstrated that the
+dressing field drastically modifies all electronic characteristics of the
+rings, including spin-orbit coupling, effective electron mass and optical
+response. Particularly, the present effect paves the way to controlling the
+spin polarization of electrons with light in prospective ring-shaped spintronic
+devices.",1801.10250v3
+2020-12-11,Dirac imprints on the $g$-factor anisotropy in graphene,"Dirac electrons in graphene are to lowest order spin 1/2 particles, owing to
+the orbital symmetries at the Fermi level. However, anisotropic corrections in
+the $g$-factor appear due to the intricate spin-valley-orbit coupling of chiral
+electrons. We resolve experimentally the $g$-factor along the three orthogonal
+directions in a large-scale graphene sample. We employ a Hall bar structure
+with an external magnetic field of arbitrary direction, and extract the
+effective $g$-tensor via resistively-detected electron spin resonance. We
+employ a theoretical perturbative approach to identify the intrinsic and
+extrinsic spin orbit coupling and obtain a fundamental parameter inherent to
+the atomic structure of $^{12}$C, commonly used in ab-initio models.",2012.06324v1
+2018-08-17,Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations,"Quantum orbital selective Mott (OSM) transitions are investigated within
+dynamical mean-field theory based on a two-orbital Hubbard model with different
+bandwidth at half filling. We find two distinct OSM phases both showing
+coexistence of itinerant electrons and localized spins, dependent on whether
+the Hund's coupling is full or of Ising type. The critical values and the
+nature of the OSM transitions are efficiently determined by entanglement
+entropy. We reveal that vanishing of the Kondo energy scale evidenced by
+absence of local spin fluctuations at low frequency in local dynamical spin
+susceptibility is responsible for the appearance of non-Fermi-liquid OSM phase
+in Ising Hund's coupling case. We argue that this scenario can also be applied
+to account for emergent quantum non-Fermi liquid in one-band Hubbard model when
+short-range antiferromagnetic order is considered.",1808.05786v1
+2021-09-16,Infrared to terahertz optical conductivity of $n$-type and $p$-type monolayer MoS$_2$ in the presence of Rashba spin-orbit coupling,"We investigate the effect of Rashba spin-orbit coupling (SOC) on the
+optoelectronic properties of n- and p-type monolayer MoS2. The optical
+conductivity is calculated within the Kubo formalism. We find that the
+spin-flip transitions enabled by the Rashba SOC result in a wide absorption
+window in the optical spectrum. Furthermore, we evaluate the effects of the
+polarization direction of the radiation, temperature, carrier density, and the
+strength of the Rashba spin-orbit parameter on the optical conductivity. We
+find that the position, width, and shape of the absorption peak or absorption
+window can be tuned by varying these parameters. This study shows that
+monolayer MoS2 can be a promising tunable optical and optoelectronic material
+that is active in the infrared to terahertz spectral range.",2109.08054v1
+2021-09-23,Strain-induced topological phase transition at (111) SrTiO$_3$-based heterostructures,"The quasi-two-dimensional electronic gas at the (111) SrTiO$_3$-based
+heterostructure interfaces is described by a multi-band tight-binding model
+providing electronic bands in agreement at low energies with photoemission
+experiments. We analyze both the roles of the spin-orbit coupling and of the
+trigonal crystal field effects. We point out the presence of a regime with
+sizable strain where the band structure exhibits a Dirac cone whose features
+are consistent with \textit{ab-initio} approaches. The combined effect of
+spin-orbit coupling and trigonal strain gives rise to non-trivial spin and
+orbital angular momenta patterns in the Brillouin zone and to quantum spin Hall
+effect by opening a gap at the Dirac cone. The system can switch from a
+conducting to a topological insulating state \textit{via} modification of
+trigonal strain within a parameter range which is estimated to be
+experimentally achievable.",2109.11563v1
+2024-02-08,Understanding electronic excited states in BiFeO$_3$ via ab initio calculations and symmetry analysis,"BiFeO$_3$ is a technologically relevant multiferroic perovskite featuring
+ferroelectricity and antiferromagnetism. Its lattice, magnetic, and
+ferroelectric degrees of freedoms are coupled to its optically active
+excitations and thus hold the potential to be reversible probed and controlled
+by light. In this work, we combine ab initio density functional and many-body
+perturbation theory methods with an extensive symmetry and atomic-orbital
+analysis to describe and understand the electronic excited states spectrum and
+its imprint on the optical absorption spectrum with quantitative accuracy and
+qualitative insights. We find that the optical absorption spectrum of BiFeO$_3$
+contain several strongly bound and spatially localized electronic transitions
+in which the spin-degree of freedom is almost fully flipped. With our analysis
+we thoroughly characterize these localized spin-flip transitions in terms of
+the unusual crystal field splitting of Fe-$3d$ single-electron orbitals. Our
+symmetry analysis further allows us to thoroughly explain how the spin content
+and the energetic fine structure of these strongly bound excitons are dictated
+by the interplay between crystal symmetry, electron-hole attraction, and the
+spin-orbit coupling.",2402.05542v2
+2024-02-12,Tuning proximity spin-orbit coupling in graphene/NbSe$_2$ heterostructures via twist angle,"We investigate the effect of the twist angle on the proximity spin-orbit
+coupling (SOC) in graphene/NbSe$_2$ heterostructures from first principles. The
+low-energy Dirac bands of several different commensurate twisted supercells are
+fitted to a model Hamiltonian, allowing us to study the twist-angle dependency
+of the SOC in detail. We predict that the magnitude of the Rashba SOC can
+triple, when going from $\Theta=0^\circ$ to $\Theta=30^\circ$ twist angle.
+Furthermore, at a twist angle of $\Theta\approx23^\circ$ the in-plane spin
+texture acquires a large radial component, corresponding to a Rashba angle of
+up to $\Phi=25^\circ$. The twist-angle dependence of the extracted proximity
+SOC is explained by analyzing the orbital decomposition of the Dirac states to
+reveal with which NbSe$_2$ bands they hybridize strongest. Finally, we employ a
+Kubo formula to evaluate the efficiency of conventional and unconventional
+charge-to-spin conversion in the studied heterostructures.",2402.07533v1
+2024-02-22,Dominant 1/3-filling Correlated Insulator States and Orbital Geometric Frustration in Twisted Bilayer Graphene,"Geometric frustration is a phenomenon in a lattice system where not all
+interactions can be satisfied, the simplest example being antiferromagnetically
+coupled spins on a triangular lattice. Frustrated systems are characterized by
+their many nearly degenerate ground states, leading to non-trivial phases such
+as spin ice and spin liquids. To date most studies are on geometric frustration
+of spins; much less explored is orbital geometric frustration. For electrons in
+twisted bilayer graphene (tBLG) at denominator 3 fractional filling, Coulomb
+interactions and the Wannier orbital shapes are predicted to strongly constrain
+spatial charge ordering, leading to geometrically frustrated ground states that
+produce a new class of correlated insulators (CIs). Here we report the
+observation of dominant denominator 3 fractional filling insulating states in
+large angle tBLG; these states persist in magnetic fields and display magnetic
+ordering signatures and tripled unit cell reconstruction. These results are in
+agreement with a strong-coupling theory of symmetry-breaking of geometrically
+frustrated fractional states.",2402.14774v1
+2005-06-23,"Interplay among Spin, Orbital and Lattice Degrees of Freedom in $t_{2g}$ Electron Systems with Edge-Sharing Network of Octahedra","Transition metal oxides whose lattice structure has edge-sharing network of
+octahedra constitute a diverse group of intriguing materials besides compounds
+with corner-sharing octahedra such as perovskites. We present a theoretical
+investigation of the interplay among spin, orbital and lattice degrees of
+freedom in these materials. We focus on $t_{2g}$ electron systems where a keen
+competition among those degrees of freedom is expected to emerge under a
+relatively weak Jahn-Teller coupling. We study the interplay between spin and
+orbital degrees of freedom in vanadium spinels and titanium pyroxenes. We
+clarify the important role of the strong anisotropy in the orbital interactions
+due to the edge-sharing geometry. We also discuss the interplay between spin
+and lattice in chromium spinels focusing on the magnetization process under the
+external magnetic field.",0506598v1
+2005-08-26,Infrared absorption in a quantum wire in the presence of spin-orbit coupling: a technique to measure different types of spin-orbit interaction strengths,"We show that the dominant absorption peak due to inter-subband transition in
+a gated quantum wire, with two occupied subbands, will split into a main peak
+and two satellite peaks if both Rashba and Dresselhaus spin-orbit interactions
+are present. One satellite peak will be red-shifted, and the other
+blue-shifted. From the relative intensity of either satellite peak, and the
+magnitude of the red- or blue-shift, we can determine both Rashba and
+Dresselhaus interaction strengths separately, if we also carry out a Hall
+measurement to determine the carrier concentration and a quantized conductance
+step measurement to determine the energy separation between subbands. This
+method may be a convenient alternative to usual magneto-transport measurements
+used to measure spin orbit interaction strengths. It is also more powerful
+because it allows us to measure the strengths of the two types of interactions
+separately.",0508638v2
+2005-10-07,2D SNS junction with Rashba spin-orbit interaction,"The effect of Rashba spin-orbital interaction upon supercurrent in S-2DEG-S
+proximity junctions is investigated in the clean limit. Generalization of
+Beenakker's formula for Andreev levels to the case of spin-orbital scattering
+is presented. Spin-orbit - induced splitting of Andreev bound-states is
+predicted for a junction of infinite width, and with non-vanishing normal
+backscattering at S/N interfaces. Semiclassical average of the Josephson
+current is however insensitive to the Rashba coupling as long as
+electron-electron interaction in 2DEG is neglected.",0510182v2
+2005-11-22,Spin-Orbit Berry Phase in a Quantum Loop,"We have found a manifestation of spin-orbit Berry phase in the conductance of
+a mesoscopic loop with Rashba spin-orbit coupling placed in an external
+magnetic field perpendicular to the loop plane. In detail, the transmission
+probabilities for a straight quantum wire and for a quantum loop made of the
+same wire have been calculated and compared with each other. The difference
+between them has been investigated and identified with a manifestation of
+spin-orbit Berry phase. The non-adiabaticity effects at small radii of the loop
+have been found as well.",0511549v2
+2002-06-05,A mass formula for baryon resonances,"Light-baryon resonances with u,d, and s quarks only can be classified using
+the non-relativistic quark model. When we assign to baryon resonances with
+total angular momenta J intrinsic orbital angular momenta L and spin S we make
+the following observations: plotting the squared masses of the light-baryon
+resonances against these intrinsic orbital angular momenta L, Delta's with even
+and odd parity can be described by the same Regge trajectory. For a given L,
+nucleon resonances with spin S=3/2 are approximately degenerate in mass with
+Delta resonances of same total orbital momentum L. To which total angular
+momentum L and S couple has no significant impact on the baryon mass. Nucleons
+with spin 1/2 are shifted in mass; the shift is - in units of squared masses -
+proportional to the component in the wave function which is antisymmetric in
+spin and flavor. Sequential resonances in the same partial wave are separated
+in mass square by the same spacing as observed in orbital angular momentum
+excitations. Based on these observations, a new baryon mass formula is proposed
+which reproduces nearly all known baryon masses.",0206012v1
+1997-09-28,The Nuclear Spin-Orbit Force in Chiral Effective Field Theories,"A compelling feature of relativistic mean-field phenomenology has been the
+reproduction of spin-orbit splittings in finite nuclei after fitting only to
+equilibrium properties of infinite nuclear matter. This successful result
+occurs when the velocity dependence of the equivalent central potential that
+leads to saturation arises primarily because of a reduced nucleon effective
+mass. The spin-orbit interaction is then also specified when one works in a
+four-component Dirac framework. Here the nature of the spin-orbit force in more
+general chiral effective field theories of nuclei is examined, with an emphasis
+on the role of the tensor coupling of the isoscalar vector meson (omega) to the
+nucleon.",9709064v1
+2003-11-20,Spin-orbit correlation energy in neutron matter,"We study the relevance of the energy correlation produced by the two-body
+spin-orbit coupling present in realistic nucleon-nucleon potentials. To this
+purpose, the neutron matter Equation of State (EoS) is calculated with the
+realistic two-body Argonne $v_8'$ potential. The shift occuring in the EoS when
+spin-orbit terms are removed is taken as an estimate of the spin-orbit
+correlation energy. Results obtained within the Bethe-Brueckner-Goldstone
+expansion, extended up to three hole-line diagrams, are compared with other
+many-body calculations recently presented in the literature. In particular,
+excellent agreement is found with the Green's function Monte-Carlo method. This
+agreement indicates the present theoretical accuracy in the calculation of the
+neutron matter EoS.",0311070v1
+2011-02-23,Influence of the spin-orbit interaction in the impurity-band states of n-doped semiconductors,"We study numerically the effects of the Rashba spin-orbit interaction on the
+model of electrons in n-doped semiconductors of Matsubara and Toyozawa (MT). We
+focus on the analysis of the density of states (DOS) and the inverse
+participation ratio (IPR) of the spin-orbit perturbed states in the MT set of
+energy eigenstates in order to characterize the eigenstates with respect to
+their extended or localized nature. The finite sizes that we are able to
+consider necessitate an enhancement of the spin-orbit coupling strength in
+order to obtain a meaningful perturbation. The IPR and DOS are then studied as
+a function of the enhancement parameter.",1102.4760v1
+2013-10-31,Dilute Magnetism and Spin-Orbital Percolation Effects in Rh-doped Sr2IrO4,"We have used a combination of resonant magnetic x-ray scattering (RMXS) and
+x-ray absorption spectroscopy (XAS) to investigate the properties of the doped
+spin-orbital Mott insulator Sr2Ir(1-x)Rh(x)O4 (0.07 < x < 0.70). We show that
+Sr2Ir(1-x)Rh(x)O4 represents a unique model system for the study of dilute
+magnetism in the presence of strong spin-orbit coupling, and provide evidence
+of a doping-induced change in magnetic structure and a suppression of magnetic
+order at x_c ~ 0.17. We demonstrate that Rh-doping introduces Rh3+/Ir5+ ions
+which effectively hole-dope this material. We propose that the magnetic phase
+diagram for this material can be understood in terms of a novel spin-orbital
+percolation picture.",1311.0039v2
+2014-07-08,Quantum oscillation signatures of nodal spin-orbit coupling in underdoped bilayer high Tc cuprates,"The highest superconducting transition temperatures in the cuprates are
+achieved in bilayer and trilayer systems, highlighting the importance of
+intralayer interactions for high Tc. It has been argued that interlayer
+hybridization vanishes along the nodal directions by way of a specific pattern
+of orbital overlap. Recent quantum oscillation measurements in bilayer cuprates
+have provided evidence for a residual bilayer-splitting at the nodes that is
+sufficiently small to enable magnetic breakdown tunneling at the nodes. Here we
+show that several key features of the experimental data can be understood in
+terms weak spin-orbit interactions naturally present in bilayer systems, whose
+primary effect is to cause the magnetic breakdown to be accompanied by a spin
+flip. These features can now be understood include the equidistant set of three
+quantum oscillation frequencies, the asymmetry of the quantum oscillation
+amplitudes in c-axis transport compared to ab-plane transport, and the
+anomalous magnetic field angle dependence of the amplitude of side frequencies
+suggestive of small effective g-factors. We suggest that spin-orbit
+interactions in bilayer systems can further affect the structure of the nodal
+quasiparticle spectrum in the superconducting phase.",1407.2291v2
+2016-11-02,Spin-Orbit Dimers and Non-Collinear Phases in $d^1$ Cubic Double Perovskites,"We formulate and study a spin-orbital model for a family of cubic double
+perovskites with $d^1$ ions occupying a frustrated fcc sublattice. A
+variational approach and a complimentary analytical analysis reveal a rich
+variety of phases emerging from the interplay of Hund's and spin-orbit
+couplings (SOC). The phase digram includes non-collinear ordered states, with
+or without net moment, and, remarkably, a large window of a non-magnetic
+disordered spin-orbit dimer phase. The present theory uncovers the physical
+origin of the unusual amorphous valence bond state experimentally suggested for
+Ba$_2B$MoO$_6$ ($B$=Y,Lu), and predicts possible ordered patterns in
+Ba$_2B$OsO$_6$ ($B$=Na,Li) compounds.",1611.00646v3
+2012-04-12,Magnetic order and ice rules in the multiferroic spinel FeV2O4,"We present a neutron diffraction study of FeV2O4, which is rare in exhibiting
+spin and orbital degrees of freedom on both cation sublattices of the spinel
+structure. Our data confirm the existence of three structural phase transitions
+previously identified with x-ray powder diffraction, and reveal that the lower
+two transitions are associated with sequential collinear and canted
+ferrimagnetic transitions involving both cation sites. Through consideration of
+local crystal and spin symmetry, we further conclude that Fe2+ cations are
+ferro-orbitally ordered below 135K and V3+ orbitals order at 60K in accordance
+with predictions for vanadium spinels with large trigonal distortions and
+strong spin-orbit coupling. Intriguingly, the direction of ordered vanadium
+spins at low temperatures obey `ice rules' more commonly associated with the
+frustrated rare-earth pyrochlore systems.",1204.2812v3
+2017-09-30,The impacts of the quantum-dot confining potential on the spin-orbit effect,"For a nanowire quantum dot with the confining potential modeled by both the
+infinite and the finite square wells, we obtain exactly the energy spectrum and
+the wave functions in the strong spin-orbit coupling regime. We find that
+regardless of how small the well height is, there are at least two bound states
+in the finite square well: one has the $\sigma^{x}\mathcal{P}=-1$ symmetry and
+the other has the $\sigma^{x}\mathcal{P}=1$ symmetry. When the well height is
+slowly tuned from large to small, the position of the maximal probability
+density of the first excited state moves from the center to $x\ne0$, while the
+position of the maximal probability density of the ground state is always at
+the center. A strong enhancement of the spin-orbit effect is demonstrated by
+tuning the well height. In particular, there exists a critical height
+$V^{c}_{0}$, at which the spin-orbit effect is enhanced to maximal.",1710.00816v3
+2017-12-29,Symmetry Preservation and Critical Fluctuations in a Pseudospin Crossover Perovskite LaCoO$_3$,"Spin-state crossover beyond a conventional ligand-field theory has been a
+fundamental issue in condensed matter physics. Here, we report microscopic
+observations of spin states and low-energy dynamics through orbital-resolved
+NMR spectroscopy in the prototype compound LaCoO$_3$. The $^{59}$Co NMR
+spectrum shows the preserved crystal symmetry across the crossover,
+inconsistent with $d$ orbital ordering due to the Jahn-Teller distortion. The
+orbital degeneracy results in a pseudospin ($\tilde{J} = 1$) excited state with
+an orbital moment observed as $^{59}$Co hyperfine coupling tensors. We found
+that the population of the excited state evolves above the heart crossover
+temperature. The crossover involves critical spin-state fluctuations emerging
+under the magnetic field. These results suggest that the spin-state crossover
+can be mapped into a statistical problem, analogous to the supercritical liquid
+in liquid-gas transition.",1712.10137v1
+2018-09-03,Manipulation of magnetizations by spin-orbit torques,"The control of magnetization by electric current is a rapidly developing area
+motivated by a strong synergy between breakthrough basic research discoveries
+and industrial applications in the fields of magnetic recording, magnetic field
+sensors, spintronics and nonvolatile memories. In recent years, the discovery
+of the spin-orbit torque has opened a spectrum of opportunities to manipulate
+the magnetization efficiently. This article presents a review of the historical
+background and recent literature focusing on spin-orbit torques (SOTs),
+highlighting the most exciting new scientific results and suggesting promising
+future research directions. It starts with an introduction and overview of the
+underlying physics of spin-orbit coupling effects in bulk and at interfaces,
+then describes the use of SOTs to control ferromagnets and antiferromagnets.
+Finally, we summarize the prospects for the future developments of spintronics
+devices based on SOTs.",1809.00546v1
+2018-09-24,Spin-orbit proximity effect in graphene on metallic substrates: decoration vs intercalation with metal adatoms,"The so-called spin-orbit proximity effect experimentally realized in graphene
+(G) on several different heavy metal surfaces opens a new perspective to
+engineer the spin-orbit coupling (SOC) for new generation spintronics devices.
+Here, via large-scale density functional theory (DFT) calculations performed
+for two distinct graphene/metal models, G/Pt(111) and G/Au/Ni(111), we show
+that the spin-orbit splitting of the Dirac cones (DCs) in these stuctures might
+be enhanced by either adsorption of adatoms on top of graphene (decoration) or
+between the graphene and the metal (intercalation). While the decoration by
+inducing strong graphene-adatom interaction suppresses the linearity of the G's
+$\pi$ bands, the intercalated structures reveal a weaker adatom-mediated
+graphene/substrate hybridization which preserves well-defined although
+broadened DCs. Remarkably, the intercalated G/Pt(111) structure exhibits
+splittings considerably larger than the defect-free case.",1809.08773v2
+2012-05-07,Josephson current through interacting double quantum dots with spin-orbit coupling,"We study the effect of Rashba spin-orbit interaction on the Josephson current
+through a double quantum dot in presence of Coulomb repulsion. In particular,
+we describe the characteristic effects on the magnetic-field induced
+singlet-triplet transition in the molecular regime. Exploring the whole
+parameter space, we analyze the effects of the device asymmetry, the
+orientation of the applied magnetic field with respect to the spin-orbit
+interaction, and finite temperatures. We find that at finite temperatures the
+orthogonal component of the spin-orbit interaction exhibits a similar effect as
+the Coulomb interaction inducing the occurrence of a {\pi}-phase at
+particle-hole symmetry. This provides a new route to the experimental
+observability of the {\pi}-phase in multi-level quantum dots.",1205.1291v2
+2017-05-18,Classical Emergence of Intrinsic Spin-Orbit Interaction of Light at the Nanoscale,"Traditionally, in macroscopic geometrical optics intrinsic polarization and
+spatial degrees of freedom of light can be treated independently. However, at
+the subwavelength scale these properties appear to be coupled together, giving
+rise to the spin-orbit interaction (SOI) of light. In this work we address
+theoretically the classical emergence of the optical SOI at the nanoscale. By
+means of a full-vector analysis involving spherical vector waves we show that
+the spin-orbit factorizability condition, accounting the mutual influence
+between the amplitude (spin) and phase (orbit), is fulfilled only in the
+far-field limit. On the other side, in the near-field region, an additional
+relative phase introduces an extra term that hinders the factorization and
+reveals an intricate dynamical behavior according to the SOI regime. As a
+result, we find a suitable theoretical framework able to capture analytically
+the main features of intrinsic SOI of light. Besides allowing for a better
+understanding into the mechanism leading to its classical emergence at the
+nanoscale, our approach may be useful in order to design experimental setups
+that enhance the response of SOI-based effects.",1705.06501v3
+2019-12-25,Materials Relevant to Realizing a Field-Effect Transistor based on Spin-Orbit Torques,"Spin-orbit torque is a promising mechanism for writing magnetic memories,
+while field-effect transistors are the gold-standard device for logic
+operation. The spin-orbit torque field effect transistor (SOTFET) is a proposed
+device that couples a spin-orbit-torque-controlled ferromagnet to a
+semiconducting transistor channel via the transduction in a magnetoelectric
+multiferroic. This allows the SOTFET to operate as both a memory and a logic
+device, but its realization depends on the choice of appropriate materials. In
+this report, we discuss and parametrize the types of materials that can lead to
+a SOTFET heterostructure.",1912.11715v1
+2021-04-29,Discreteness of Space from Anisotropic Spin-Orbit Interaction,"Various approaches to Quantum Gravity suggest an existence of a minimal
+measurable length. The cost to have such minimal length could be modified
+uncertainty principle, modified dispersion relation, non-commutative geometry
+or breaking of continuous Lorentz symmetry. In this paper, we propose that
+minimal length can be obtained naturally through spin-orbit interaction. We
+consider Dresselhaus anisotropic spin-orbit interaction as the perturbative
+Hamiltonian. When applied to a particle, it implies that the space, which
+seizes this particle, should be quantized in terms of units that depend on
+particle's mass. This suggests that all measurable lengths in the space are
+quantized in units depending on existent mass and the Dresselhaus coupling
+constant. On one side, this indicates a breakdown of the space continuum
+picture near the scale of tabletop experiments, and on the other side, it
+proposes that spin-orbit interaction is a possible quantum gravity effect at
+low energy scale that leads naturally to space quantization.",2104.14563v1
+2022-11-17,Flat Band Induced Metal-Insulator Transitions for Weak Magnetic Flux and Spin-Orbit Disorder,"We consider manifolds of tunable all-band flat (ABF) lattices in dimensions d
+= 1, 2, parametrized by a manifold angle parameter {\theta}. We study
+localization properties of eigenstates in the presence of weak magnetic flux
+disorder and weak spin-orbit disorder. We demonstrate that weakly disordered
+ABF lattices are described by effective scale-free models where the disorder
+strength is scaled out. For weak magnetic flux disorder we observe
+sub-exponential localization at flatband energies in d = 1, which differs from
+the usual Anderson localization. We also find diverging localisation length at
+flatband energies for weak flux values in d = 2, however the character of the
+eigenstates at these energies is less clear. For weak spin-orbit coupling
+disorder in d = 2 we identify a tunable metal-insulator transition with
+mobility edges. We also consider the case of mixed spin-orbit and diagonal
+disorder and obtain the metal-insulator transition driven by the manifold
+parameter {\theta}.",2211.09410v2
+2011-03-21,Spin-orbit hybrid entanglement of photons and quantum contextuality,"We demonstrate electromagnetic quantum states of single photons and of
+correlated photon pairs exhibiting ""hybrid"" entanglement between spin and
+orbital angular momentum. These states are obtained from entangled photon pairs
+emitted by spontaneous parametric down conversion, by employing a $q$-plate for
+coupling the spin and orbital degrees of freedom of a photon. Entanglement and
+contextual quantum behavior (that is also non-local, in the case of photon
+pairs) is demonstrated by the reported violation of the
+Clauser-Horne-Shimony-Holt inequality. In addition a classical analog of the
+hybrid spin-orbit photonic entanglement is reported and discussed.",1103.3962v1
+2014-04-28,Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3,"Tight-binding models for the recently observed surface electronic bands of
+SrTiO3 and KTaO3 are analyzed with a view to bringing out the relevance of
+momentum-space chiral angular momentum structures of both orbital and spin
+origins. Depending on the strength of electric field associated with inversion
+symmetry breaking at the surface, the orbital and the accompanying spin angular
+momentum structures reveal complex linear and cubic dependencies in the
+momentum k (linear and cubic Rashba effects, respectively) in a band-specific
+manner. Analytical expressions for the cubic orbital and spin Rashba effects
+are derived by way of unitary transformation technique we developed, and
+compared to numerical calculations. Due to the C4v symmetry of the perovskite
+structure the cubic Rashba effect appears as in-plane modulations.",1404.6858v1
+2016-02-22,Staggering antiferromagnetic domain wall velocity in a staggered spin-orbit field,"We demonstrate the possibility to drive an antiferromagnet domain-wall at
+high velocities by field-like N\'{e}el spin-orbit torques. Such torques arise
+from current-induced local fields that alternate their orientation on each
+sub-lattice of the antiferromagnet and whose orientation depend primarily on
+the current direction, giving them their field-like character. The domain-wall
+velocities that can be achieved by this mechanism are two orders of magnitude
+greater than the ones in ferromagnets. This arises from the efficiency of the
+staggered spin-orbit fields to couple to the order parameter and from the
+exchange-enhanced phenomena in antiferromagnetic texture dynamics, which leads
+to a low domain-wall effective mass and the absence of a Walker break-down
+limit. In addition, because of its nature, the staggered spin-orbit field can
+lift the degeneracy between two 180$^\circ$ rotated states in a collinear
+antiferromagnet and provides a force that can move such walls and control the
+switching of the states.",1602.06766v2
+2016-10-28,Spin-Orbit Torque Efficiency in Compensated Ferrimagnetic Cobalt-Terbium Alloys,"Despite the potential advantages of information storage in
+antiferromagnetically coupled materials, it remains unclear whether one can
+control the magnetic moment orientation efficiently because of the cancelled
+magnetic moment. Here, we report spin-orbit torque induced magnetization
+switching of ferrimagnetic Co1-xTbx films with perpendicular magnetic
+anisotropy. Current induced switching is demonstrated in all of the studied
+film compositions, including those near the magnetization compensation point.
+The spin-orbit torque induced effective field is further quantified in the
+domain wall motion regime. A divergent behavior that scales with the inverse of
+magnetic moment is confirmed close to the compensation point, which is
+consistent with angular momentum conservation. Moreover, we also quantify the
+Dzyaloshinskii-Moriya interaction energy in the Ta/Co1-xTbx system and we find
+that the energy density increases as a function of the Tb concentration. The
+demonstrated spin-orbit torque switching, in combination with the fast magnetic
+dynamics and minimal net magnetization of ferrimagnetic alloys, promises
+spintronic devices that are faster and with higher density than traditional
+ferromagnetic systems.",1610.09200v1
+2017-02-14,Metal-Insulator Transition and Jeff = 1/2 Spin-Orbit Insulating State in Rutile-based IrO2/TiO2 Superlattices,"By combining 5d transition-metal oxides showing pronounced spin-orbit
+interactions and oxide-based heterostructures, we propose rutile-based
+IrO2/TiO2 superlattices as promising candidates for unconventional electronic
+properties. By means of density-functional-theory simulations complemented with
+Hubbard-like corrections, we focus on the evolution of the electronic structure
+as a function of the IrO2 layer thickness and predict the heterostructures to
+exhibit a thickness-controlled metal-to-insulator transition, crucially related
+to the connectivity among IrO6 octahedra. The subtle interplay between electron
+correlation and spin-orbit coupling leads to an almost pure Jeff = 1/2
+spin-orbit insulating state at the level of atomically-thin IrO2 monolayer with
+almost isolated IrO6 octahedra, leading to a predicted emerging state awaiting
+for experimental confirmation.",1702.04408v1
+2017-01-27,Mixed Weyl semimetals and dissipationless magnetization control in insulators by spin-orbit torques,"Reliable and energy efficient magnetization switching by electrically-induced
+spin-orbit torques is of crucial technological relevance for spintronic devices
+implementing memory and logic functionality. Here we predict that the strength
+of spin-orbit torques and the related Dzyaloshinskii-Moriya interaction in
+topologically non-trivial magnetic insulators can exceed by far that of
+conventional metallic magnets. In analogy to the quantum anomalous Hall effect,
+we explain this extraordinary response in absence of longitudinal currents as a
+hallmark of magnetic monopoles in the electronic structure of systems that are
+interpreted most naturally within the framework of mixed Weyl semimetals. We
+thereby launch the effect of spin-orbit torque into the field of topology and
+reveal its crucial role in mediating the topological phase transitions arising
+due to the complex interplay between magnetization direction and momentum-space
+topology. The concepts presented here may be exploited to understand and
+utilize magneto-electric coupling phenomena in insulating ferromagnets and
+antiferromagnets.",1701.08050v2
+2020-08-12,Prediction of Tunable Spin-Orbit Gapped Materials for Dark Matter Detection,"New ideas for low-mass dark matter direct detection suggest that narrow band
+gap materials, such as Dirac semiconductors, are sensitive to the absorption of
+meV dark matter or the scattering of keV dark matter. Here we propose
+spin-orbit semiconductors - materials whose band gap arises due to spin-orbit
+coupling - as low-mass dark matter targets owing to their ~10 meV band gaps. We
+present three material families that are predicted to be spin-orbit
+semiconductors using Density Functional Theory (DFT), assess their electronic
+and topological features, and evaluate their use as low-mass dark matter
+targets. In particular, we find that that the tin pnictide compounds are
+especially suitable having a tunable range of meV-scale band gaps with
+anisotropic Fermi velocities allowing directional detection. Finally, we
+address the pitfalls in the DFT methods that must be considered in the ab
+initio prediction of narrow-gapped materials, including those close to the
+topological critical point.",2008.05062v1
+2021-06-18,Electrical tuning of the spin-orbit interaction in nanowire by transparent ZnO gate grown by atomic layer deposition,"We develop an InAs nanowire gate-all-around field-effect transistor using a
+transparent conductive zinc oxide (ZnO) gate electrode, which is in-situ atomic
+layer deposited after growth of gate insulator of Al2O3. We perform
+magneto-transport measurements and find a crossover from weak localization to
+weak antilocalization effect with increasing gate voltage, which demonstrates
+that the Rashba spin-orbit coupling is tuned by the gate electrode. The
+efficiency of the gate tuning of the spin-orbit interaction is higher than
+those obtained for two-dimensional electron gas, and as high as that for a
+gate-all-around nanowire metal-oxide-semiconductor field-effect transistor that
+was previously reported. The spin-orbit interaction is discussed in line with
+not only conventionally used one-dimensional model but also recently proposed
+model that considers effects of microscopic band structures of materials.",2106.10036v1
+2011-12-20,Ferromagnetic order of nuclear spins coupled to conduction electrons: a combined effect of the electron-electron and spin-orbit interactions,"We analyze the ordered state of nuclear spins embedded in an interacting
+two-dimensional electron gas (2DEG) with Rashba spin-orbit interaction (SOI).
+Stability of the ferromagnetic nuclear-spin phase is governed by nonanalytic
+dependences of the electron spin susceptibility $\chi^{ij}$ on the momentum
+($\tilde{\mathbf{q}}$) and on the SOI coupling constant ($\alpha$). The uniform
+($\tq=0$) spin susceptibility is anisotropic (with the out-of-plane component,
+$\chi^{zz}$, being larger than the in-plane one, $\chi^{xx}$, by a term
+proportional to $U^2(2k_F)|\alpha|$, where $U(q)$ is the electron-electron
+interaction). For $\tq \leq 2m^*|\alpha|$, corrections to the leading,
+$U^2(2k_F)|\alpha|$, term scale linearly with $\tq$ for $\chi^{xx}$ and are
+absent for $\chi^{zz}$. This anisotropy has important consequences for the
+ferromagnetic nuclear-spin phase: $(i)$ the ordered state--if achieved--is of
+an Ising type and $(ii)$ the spin-wave dispersion is gapped at $\tq=0$. To
+second order in $U(q)$, the dispersion a decreasing function of $\tq$, and
+anisotropy is not sufficient to stabilize long-range order. However,
+renormalization in the Cooper channel for $\tq\ll2m^*|\alpha|$ is capable of
+reversing the sign of the $\tq$-dependence of $\chi^{xx}$ and thus stabilizing
+the ordered state. We also show that a combination of the electron-electron and
+SO interactions leads to a new effect: long-wavelength Friedel oscillations in
+the spin (but not charge) electron density induced by local magnetic moments.
+The period of these oscillations is given by the SO length $\pi/m^*|\alpha|$.",1112.4786v2
+2015-06-23,Dynamical effects of spin-dependent interactions in low- and intermediate-energy heavy-ion reactions,"It is well known that non-central nuclear forces, such as the spin-orbital
+coupling and the tensor force, play important roles in understanding many
+interesting features of nuclear structures. However, their dynamical effects in
+nuclear reactions are poorly known since only the spin-averaged observables are
+normally studied both experimentally and theoretically. Realizing that
+spin-sensitive observables in nuclear reactions may carry useful information
+about the in-medium properties of non-central nuclear interactions, besides
+earlier studies using the time-dependent Hartree-Fock approach to understand
+effects of spin-orbital coupling on the threshold energy and spin polarization
+in fusion reactions, some efforts have been made recently to explore dynamical
+effects of non-central nuclear forces in intermediate-energy heavy-ion
+collisions using transport models. The focuses of these studies have been on
+investigating signatures of the density and isospin dependence of the form
+factor in the spin-dependent single-nucleon potential. Interestingly, some
+useful probes were identified in the model studies while so far there is still
+no data to compare with. In this brief review, we summarize the main physics
+motivations as well as the recent progress in understanding the spin dynamics
+and identifying spin-sensitive observables in heavy-ion reactions at
+intermediate energies. We hope the interesting, important, and new physics
+potentials identified in the spin dynamics of heavy-ion collisions will
+stimulate more experimental work in this direction.",1506.06860v2
+2014-03-14,Electrical spin protection and manipulation via gate-locked spin-orbit fields,"The spin-orbit (SO) interaction couples electron spin and momentum via a
+relativistic, effective magnetic field. While conveniently facilitating
+coherent spin manipulation in semiconductors, the SO interaction also
+inherently causes spin relaxation. A unique situation arises when the Rashba
+and Dresselhaus SO fields are matched, strongly protecting spins from
+relaxation, as recently demonstrated. Quantum computation and spintronics
+devices such as the paradigmatic spin transistor could vastly benefit if such
+spin protection could be expanded from a single point into a broad range
+accessible with in-situ gate-control, making possible tunable SO rotations
+under protection from relaxation. Here, we demonstrate broad, independent
+control of all relevant SO fields in GaAs quantum wells, allowing us to tune
+the Rashba and Dresselhaus SO fields while keeping both locked to each other
+using gate voltages. Thus, we can electrically control and simultaneously
+protect the spin. Our experiments employ quantum interference corrections to
+electrical conductivity as a sensitive probe of SO coupling. Finally, we
+combine transport data with numerical SO simulations to precisely quantify all
+SO terms.",1403.3518v1
+2016-05-16,A new and simple model for magneto-optics uncovers an unexpected spin switching,"In magneto-optics the spin angular momentum $S_z$ of a sample is indirectly
+probed by the rotation angle and ellipticity, which are mainly determined by
+the off-diagonal susceptibility $\chi^{(1)}_{xy}$. A direct and analytic
+relation between $S_z$ and $\chi^{(1)}_{xy}$ is necessary and of paramount
+importance to the success of magneto-optics, but is often difficult to acquire
+since quantum mechanically the relation is hidden in the sum-over-states. Here
+we propose a new and simple model to establish such a much needed relation. Our
+model is based on the Hookean model, but includes spin-orbit coupling. Under cw
+excitation, we show that $\chi^{(1)}_{xy}(\omega)$ is indeed directly
+proportional to $S_z$ for a fixed photon frequency $\omega$. Such an elegant
+relation is encouraging, and we wonder whether our model can describe spin
+dynamics as well. By allowing the spin to change dynamically, to our surprise,
+our model predicts that an ultrafast laser pulse can induce a spin precession;
+with appropriate parameters, the laser can even reverse spin from one direction
+to another. This works for both the circularly and linearly polarized light.
+The spin reversal window is narrow. These unexpected results closely resemble
+all-optical helicity-dependent magnetic switching found in much more
+complicated ferrimagnetic rare earth compounds. Therefore, we believe that our
+spin-orbit coupled model may find some important applications in spin switching
+processes, a hot topic in femtomagnetism.",1605.04847v1
+2020-12-11,The semiclassical theory for spin dynamics in a disordered system,"We investigate the Drude model of spin dynamics in two-dimensional spin-orbit
+coupled systems. In the absence of an applied electric field, the spin aligns
+with the k-dependent effective magnetic field. The influence of disorder (the
+momentum relaxation time $\tau$) on the system is considered. In the presence
+of an electric field, the change in momentum causes a change in the effective
+magnetic field. The in-plane spin can precess around the successive change in
+the orientation of the effective magnetic field. We find that up to the linear
+order of the electric field, the spin orientation undergoes Larmor-like and
+non-Larmor like precession. Furthermore, we find that the non-Larmor motion
+over a very short time ($t\ll\tau$) exactly equals the result obtained from the
+Kubo formula. This means that the Kubo formula only captures the system's
+response over a very short evolution. The spin-Hall conductivity for Larmor and
+non-Larmor precession in the Rashba system is analytically calculated. We find
+that the intrinsic spin-Hall current is not a universal constant and correctly
+drops to zero when the Rashba spin-orbit coupling drops to zero. We also
+calculate the time-averaged Larmor and non-Larmor spin-Hall conductivities
+(SHCs) for the k-cubic Rashba system and compare them to experimental values.
+The time-averaged Larmor SHC vanishes and the non-Larmor SHC is given by
+$2.1(q/8\pi)$ which is very close to the experimental value $2.2(q/8\pi)$ by
+Wunderlich et al. [Phys. Rev. Lett. {\bf 94}, 047204 (2005)].",2012.06053v1
+2018-03-02,Coherent electron transport in silicon quantum dots,"With silicon being the go-to material for spin qubits, and motivated by the
+demand of a scalable quantum computer architecture for fast and reliable
+quantum information transfer on-chip, we study coherent electron transport in a
+silicon double quantum dot. We first examine the valley-orbital dynamics in a
+silicon double dot, and discuss how to properly measure the tunnel couplings as
+well as the valley phase difference between two quantum dots. We then focus on
+possible phase and spin flip errors during spin transport across a silicon
+double dot. In particular, we clarify correction on the effective $g$-factor
+for the electron spin from the double dot confinement potential, and quantify
+the resulting phase error. We then study spin fidelity loss due to spin-valley
+mixing, which is a unique feature of silicon quantum dots. We show that a small
+phase correction between valleys can cause a significant coherence loss. We
+also investigate spin flip errors caused by either an external inhomogeneous
+magnetic field or the intrinsic spin-orbit coupling. We show that the presence
+of valleys makes it possible to have much broader (in terms of interdot
+detuning) level anti-crossings compared to typical anti-crossings in, for
+example, a GaAs double dot, and such broad anti-crossings lead to amplification
+of spin flip errors. Lastly, we design a pulse sequence to suppress various
+possible spin flip errors by taking advantage of the multiple level
+anti-crossings in a silicon double dot and employing Landau-Zener transitions.",1803.00749v3
+2021-09-09,Reliability of spin-to-charge conversion measurements in graphene-based lateral spin valves,"Understanding spin physics in graphene is crucial for developing future
+two-dimensional spintronic devices. Recent studies show that efficient
+spin-to-charge conversions via either the inverse spin Hall effect or the
+inverse Rashba-Edelstein effect can be achieved in graphene by proximity with
+an adjacent spin-orbit coupling material. Lateral spin valve devices, made up
+of a graphene Hall bar and ferromagnets, are best suited for such studies.
+Here, we report that signals mimicking the inverse Rashba-Edelstein effect can
+be measured in pristine graphene possessing negligible spin-orbit coupling,
+confirming that these signals are unrelated to spin-to-charge conversion. We
+identify either the anomalous Hall effect in the ferromagnet or the ordinary
+Hall effect in graphene induced by stray fields as the possible sources of this
+artefact. By quantitatively comparing these options with finite-element-method
+simulations, we conclude the latter better explains our results. Our study
+deepens the understanding of spin-to-charge conversion measurement schemes in
+graphene, which should be taken into account when designing future experiments.",2109.04170v2
+2022-07-12,Quantum phase transition in magnetic nanographenes on a lead superconductor,"Quantum spins, referred to the spin operator preserved by full SU(2) symmetry
+in the absence of the magnetic anistropy, have been proposed to host exotic
+interactions with superconductivity4. However, spin orbit coupling and crystal
+field splitting normally cause a significant magnetic anisotropy for d/f-shell
+spins on surfaces6,9, breaking SU(2) symmetry and fabricating the spins with
+Ising properties10. Recently, magnetic nanographenes have been proven to host
+intrinsic quantum magnetism due to their negligible spin orbital coupling and
+crystal field splitting. Here, we fabricate three atomically precise
+nanographenes with the same magnetic ground state of spin S=1/2 on Pb(111)
+through engineering sublattice imbalance in graphene honeycomb lattice.
+Scanning tunneling spectroscopy reveals the coexistence of magnetic bound
+states and Kondo screening in such hybridized system. Through engineering the
+magnetic exchange strength between the unpaired spin in nanographenes and
+cooper pairs, quantum phase transition from the singlet to the doublet state
+has been observed, in consistent with quantum models of spins on
+superconductors. Our work demonstrates delocalized graphene magnetism host
+highly tunable magnetic bound states with cooper pairs, which can be further
+developed to study the Majorana bound states and other rich quantum physics of
+low-dimensional quantum spins on superconductors.",2207.05313v1
+2022-09-01,Large spin-to-charge conversion at the two-dimensional interface of transition metal dichalcogenides and permalloy,"Spin-to-charge conversion is an essential requirement for the implementation
+of spintronic devices. Recently, monolayers of semiconducting transition metal
+dichalcogenides (TMDs) have attracted considerable interest for spin-to-charge
+conversion due to their high spin-orbit coupling and lack of inversion symmetry
+in their crystal structure. However, reports of direct measurement of
+spin-to-charge conversion at TMD-based interfaces are very much limited. Here,
+we report on the room temperature observation of a large spin-to-charge
+conversion arising from the interface of Ni$_{80}$Fe$_{20}$ (Py) and four
+distinct large area ($\sim 5\times2$~mm$^2$) monolayer (ML) TMDs namely,
+MoS$_2$, MoSe$_2$, WS$_2$, and WSe$_2$. We show that both spin mixing
+conductance and the Rashba efficiency parameter ($\lambda_{IREE}$) scales with
+the spin-orbit coupling strength of the ML TMD layers. The $\lambda_{IREE}$
+parameter is found to range between $-0.54$ and $-0.76$ nm for the four
+monolayer TMDs, demonstrating a large spin-to-charge conversion. Our findings
+reveal that TMD/ferromagnet interface can be used for efficient generation and
+detection of spin current, opening new opportunities for novel spintronic
+devices.",2209.00332v1
+2022-10-07,Colloquium: Spin-orbit effects in superconducting hybrid structures,"Spin-orbit coupling (SOC) describes the interaction between an electron's
+motion and its spin, and is ubiquitous in condensed matter systems. The
+interplay of SOC with superconductivity has attracted significant interest over
+the past decade and understanding has substantially progressed, both
+experimentally and theoretically. Even with well-understood materials,
+conventional $s$-wave superconducting hybrid structures with SOC provide a
+platform for realizing exotic phenomena and counterparts in the normal state.
+Understanding the emergent phenomena in such systems is an important aim in
+condensed matter physics. One such area relates to the generation and interplay
+of spin-polarized spin-triplet Cooper pairs in superconducting structures with
+magnetic interfaces. It is established that certain forms of magnetic
+inhomogeneity at an $s$-wave superconductor interface with a ferromagnet can
+transform spin-singlet Cooper pairs into a spin-polarized spin-triplet Cooper
+pairs, enabling transformative concepts for cryogenic computing. Recently,
+theory and experiments have demonstrated singlet-to-triplet pair conversion via
+SOC in $s$-wave superconducting structures with or without magnetic layers.
+Moreover, the spin-dependent properties of quasiparticles and their
+non-equilibrium behavior also change in the presence of SOC. These
+breakthroughs create the potential for energy-efficient control of static and
+dynamic spin phenomena in superconducting structures and devices. This article
+reviews progress in superconducting spintronics with a focus on the coupling of
+superconductivity and SOC in hybrid structures and devices, and outlines
+directions that are critical for future device development and fundamental
+understanding.",2210.03549v1
+2017-06-06,Time-dependent theory of solar meridional flows,"We explore consequences for the solar dynamo of a newly-developed physical
+hypothesis describing a weak coupling of the orbital and rotational motions of
+extended bodies. The coupling is given by - c ((dL/dt) x omega sub alpha) x r,
+where dL/dt represents the rate of change of barycentric orbital angular
+momentum, omega sub alpha is the angular velocity of rotation, r is a position
+vector identifying a particular location in a coordinate system rotating with
+the Sun, and c is a coupling efficiency coefficient. This form of coupling has
+no dependence on tides. The coupling expression defines a non-axisymmetric
+global-scale acceleration field that varies both in space and with time.
+Meridional components of acceleration typically dominate in equatorial and
+middle latitudes, while zonal accelerations become increasingly significant at
+higher latitudes. A comparison of the waveform of the putative dynamical
+forcing function with the time series for measured solar meridional flow speeds
+from Sunspot Cycle 23 yields correlations significant at the 99.9% level. We
+introduce the possibility of a destructive interaction between the predicted
+large-scale flows (due to orbit-spin coupling) and the dynamo mechanism(s) of
+the 22-year magnetic activity cycle; observations in recent cycles of higher
+meridional flow speeds during episodes of reduced solar sunspot activity may be
+explained as a consequence of differences between the phasing of the magnetic
+cycle and the phase of the forcing function. Algorithms are provided for
+calculating meridional and zonal orbit-spin coupling accelerations within the
+Sun as a function of latitude, longitude, depth, and time.",1706.01854v1
+2013-05-30,Experimental Determination of the Finite-Temperature Phase Diagram of a Spin-Orbit Coupled Bose Gas,"Spin-orbit (SO) coupling has led to numerously exciting phenomena in electron
+systems, for instance, the recently discovered topological insulator. The
+synthesized SO coupling with ultracold neutral atoms opens a new avenue of
+quantum simulation, and gives us an opportunity to study SO coupling in bosonic
+systems. Indeed, SO coupling leads to many new phenomena of boson superfluidity
+and various condensate phases that spontaneously break different symmetries. A
+richer structure of symmetry breaking always results in a nontrivial
+finite-temperature phase diagram. While the thermodynamics of the SO coupled
+Bose gas at finite temperature is still unknown either in theory or experiment.
+In this work, we experimentally generate the SO coupling in ultracold Rb-87 gas
+to explore in a large temperature range and get most key features. We discover
+a novel phase transition between the stripe ordered phase and the magnetized
+phase, which is reminiscent of temperature-driven transition from the B phase
+to the A phase in super- fluid Helium-3 and from spin-density-wave to spin
+nematic transition in iron pnictide. We also observe that the magnetic phase
+transition and the Bose condensate transition occur simultaneously as
+temperature decreases. Our work determines the entire finite-temperature phase
+diagram of SO coupled Bose gas and further demonstrate the power of quantum
+simulation.",1305.7054v2
+1998-12-04,Interaction-Induced Enhancement of Spin-Orbit Coupling in Two-Dimensional Electronic System,"We study theoretically the renormalization of the spin-orbit coupling
+constant of two-dimensional electrons by electron-electron interactions. We
+demonstrate that, similarly to the $g$ factor, the renormalization corresponds
+to the enhancement, although the magnitude of the enhancement is weaker than
+that for the $g$ factor. For high electron concentrations (small interaction
+parameter $r_s$) the enhancement factor is evaluated analytically within the
+static random phase approximation. For large $r_s\sim 10$ we use an approximate
+expression for effective electron-electron interaction, which takes into
+account the local field factor, and calculate the enhancement numerically. We
+also study the interplay between the interaction-enhanced Zeeman splitting and
+interaction-enhanced spin-orbit coupling.",9812083v1
+1999-07-09,Anomalous temperature dependences of the susceptibility for the one-3d- electron cation,"We have studied properties of the one-3d-electron cation (Ti 3+, V 4+ ions)
+under the action of the low-symmetry crystal field in the presence of the spin-
+orbit coupling. Very anomalous temperature dependences of the magnetic
+susceptibility chi (T) have been obtained as resulting from the off-cubic
+lattice distortion provided the intra-atomic spin-orbit coupling is taken into
+account. It indicates that, despite of the weakness of the spin-orbit coupling,
+the one 3d electron in a solid cannot be treated as a free S=1/2 spin. The same
+holds for compounds containing the Ti 3+ and V4+ ions.",9907141v1
+2006-04-29,Tunneling between 2D electron layers with correlated disorder: anomalous sensitivity to spin-orbit coupling,"Tunneling between two-dimensional electron layers with mutually correlated
+disorder potentials is studied theoretically. Due to this correlation, the
+diffusive eigenstates in different layers are almost orthogonal to each other.
+As a result, a peak in the tunnel I-V characteristics shifts towards small
+bias, V. This ""protects"" the peak against the interaction-induced smearing,
+since the relaxation rate near the Fermi level is low. If the correlation in
+disorder potentials is complete, the peak position and width are governed by
+the spin-orbit coupling in the layers; this coupling lifts the orthogonality of
+the eigenstates. Possibility to use inter-layer tunneling for experimental
+determination of weak intrinsic spin-orbit splitting of the Fermi surface is
+discussed.",0605019v2
+2008-09-10,Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnets,"In this article, I analyze the symmetries and degeneracies of electron
+eigenstates in a commensurate collinear antiferromagnet. In a magnetic field
+transverse to the staggered magnetization, a hidden anti-unitary symmetry
+protects double degeneracy of the Bloch eigenstates at a special set of
+momenta. In addition to this `Kramers degeneracy' subset, the manifold of
+momenta, labeling the doubly degenerate Bloch states in the Brillouin zone, may
+also contain an `accidental degeneracy' subset, that is not protected by
+symmetry and that may change its shape under perturbation. These degeneracies
+give rise to a substantial momentum dependence of the transverse g-factor in
+the Zeeman coupling, turning the latter into a spin-orbit interaction.
+  I discuss a number of materials, where Zeeman spin-orbit coupling is likely
+to be present, and outline the simplest properties and experimental
+consequences of this interaction, that may be relevant to systems from chromium
+to borocarbides, cuprates, hexaborides, iron pnictides, as well as organic and
+heavy fermion conductors.",0809.1893v3
+2010-02-12,Spin-Orbit Coupling and Anomalous Angular-Dependent Magnetoresistance in the Quantum Transport Regime of PbS,"We measured magnetotransport properties of PbS single crystals which exhibit
+the quantum linear magnetoresistance (MR) as well as the static skin effect
+that creates a surface layer of additional conductivity. The Shubnikov-de Haas
+oscillations in the longitudinal MR signify the peculiar role of spin-orbit
+coupling. In the angular-dependent MR, sharp peaks are observed when the
+magnetic field is slightly inclined from the longitudinal configuration, which
+is totally unexpected for a system with nearly spherical Fermi surface and
+points to an intricate interplay between the spin-orbit coupling and the
+conducting surface layer in the quantum transport regime.",1002.2481v1
+2011-04-04,Macroscopic Klein Tunneling in spin-orbit coupled Bose-Einstein Condensates,"We propose an experimental scheme to detect macroscopic Klein tunneling with
+spin-orbit coupled Bose-Einstein condensates (BECs). We show that a nonlinear
+Dirac equation with tunable parameters can be realized with such BECs. %in a
+simple configuration to generate the artificial spin-orbit coupling. Through
+numerical calculations, we demonstrate that macroscopic Klein tunneling can be
+clearly detected under realistic conditions. Macroscopic quantum coherence in
+such relativistic tunneling is clarified and a BEC with a negative energy is
+shown to be able to transmit transparently through a wide Gaussian potential
+barrier.",1104.0444v2
+2011-05-18,Enhancement of the Kondo effect through Rashba spin-orbit interactions,"We analyze the physics of a one-orbital Anderson impurity model in a
+two-dimensional electron gas in the presence of Rashba spin-orbit (RSO)
+interactions in the Kondo regime. The spin SU(2) symmetry breaking results in
+an effective two-band electron gas coupled to the impurity. The Kondo regime is
+obtained by a Schrieffer-Wolff transformation revealing the existence of a
+parity breaking term with the form of the Dzyaloshinsky-Moriya (DM)
+interaction. The DM term vanishes at the particle-hole symmetric point of the
+system, but it has important effects otherwise. Performing a renormalization
+group (RG) analysis we find that the model describes a two-channel Kondo system
+with ferro- and anti-ferromagnetic couplings. Furthermore, the DM term
+renormalizes the antiferromagnetic Kondo coupling producing an exponential
+enhancement of the Kondo temperature. We suggest that these effects can be
+observed in semiconducting systems, as well as in graphene and topological
+insulators.",1105.3522v2
+2011-06-29,From Anderson to anomalous localization in cold atomic gases with effective spin-orbit coupling,"We study the dynamics of a one-dimensional spin-orbit coupled Schrodinger
+particle with two internal components moving in a random potential. We show
+that this model can be implemented by the interaction of cold atoms with
+external lasers and additional Zeeman and Stark shifts. By direct numerical
+simulations a crossover from an exponential Anderson-type localization to an
+anomalous power-law behavior of the intensity correlation is found when the
+spin-orbit coupling becomes large. The power-law behavior is connected to a
+Dyson singularity in the density of states emerging at zero energy when the
+system approaches the quasi-relativistic limit of the random mass Dirac model.
+We discuss conditions under which the crossover is observable in an experiment
+with ultracold atoms and construct explicitly the zero-energy state, thus
+proving its existence under proper conditions.",1106.5925v2
+2011-10-11,Topological superfluid in a trapped two-dimensional polarized Fermi gas with spin-orbit coupling,"We study the stability region of the topological superfluid phase in a
+trapped two-dimensional polarized Fermi gas with spin-orbit coupling and across
+a BCS-BEC crossover. Due to the competition between polarization, pairing
+interaction and spin-orbit coupling, the Fermi gas typically phase separates in
+the trap. Employing a mean field approach that guarantees the ground state
+solution, we systematically study the structure of the phase separation and
+investigate in detail the optimal parameter region for the preparation of the
+topologically non-trivial superfluid phase. We then calculate the momentum
+space density distribution of the topological superfluid state and demonstrate
+that the existence of the phase leaves a unique signature in the trap
+integrated momentum space density distribution which can survive the
+time-of-flight imaging process.",1110.2285v2
+2012-09-24,Testing the validity of the strong spin-orbit-coupling limit for octahedrally coordinated iridates in a model system Sr$_3$CuIrO$_6$,"The electronic structure of Sr$_3$CuIrO$_6$, a model system for the 5d Ir ion
+in an octahedral environment, is studied through a combination of resonant
+inelastic x-ray scattering (RIXS) and theoretical calculations. RIXS spectra at
+the Ir L$_3$-edge reveal an Ir $t_{2g}$ manifold that is split into three
+levels, in contrast to the expectations of the strong spin-orbit-coupling
+limit. Effective Hamiltonian and $ab inito$ quantum chemistry calculations find
+a strikingly large non-cubic crystal field splitting comparable to the
+spin-orbit coupling, which results in a strong mixing of the
+$j_{\mathsf{eff}}=1/2$ and $j_{\mathsf{eff}}=3/2$ states and modifies the
+isotropic wavefunctions on which many theoretical models are based.",1209.5294v1
+2013-03-09,Radio-frequency spectroscopy of a strongly interacting spin-orbit coupled Fermi gas,"We investigate experimentally and theoretically radio-frequency spectroscopy
+and pairing of a spin-orbit-coupled Fermi gas of $^{40}$K atoms near a Feshbach
+resonance at $B_{0}=202.2$ G. Experimentally, the integrated spectroscopy is
+measured, showing characteristic blue and red shifts in the atomic and
+molecular responses, respectively, with increasing spin-orbit coupling.
+Theoretically, a smooth transition from atomic to molecular responses in the
+momentum-resolved spectroscopy is predicted, with a clear signature of
+anisotropic pairing at and below resonance. Our many-body prediction agrees
+qualitatively well with the observed spectroscopy near the Feshbach resonance.",1303.2212v1
+2013-05-24,Andreev reflection at the edge of a two-dimensional electron system with strong spin-orbit coupling,"We experimentally investigate transport properties of a single planar
+junction between the niobium superconductor and the edge of a two-dimensional
+electron system in a narrow $In_{0.75}Ga_{0.25}As$ quantum well with strong
+Rashba-type spin-orbit coupling. We experimentally demonstrate suppression of
+Andreev reflection at low biases at ultra low temperatures. From the analysis
+of temperature and magnetic field behavior, we interpret the observed
+suppression as a result of a spin-orbit coupling. There is also an experimental
+sign of the topological superconductivity realization in the present structure.",1305.5685v5
+2013-07-09,Topological Fulde-Ferrel-Larkin-Ovchinnikov states in Spin-orbit Coupled Fermi Gases,"Pairing in an attractively interacting two-component Fermi gas in the absence
+of the inversion symmetry and/or the time-reversal symmetry may give rise to
+exotic superfluid states. Notable examples range from the
+Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state with a finite center-of-mass
+momentum in a polarized Fermi gas, to the topological superfluid state in a
+two-dimensional Fermi gas under Rashba spin-orbit coupling and an out-of-plane
+Zeeman field. Here, we show that a topological FFLO state can be stabilized in
+a two-dimensional Fermi gas with Rashba spin-orbit coupling and both in-plane
+and out-of-plane Zeeman fields. We characterize the topological FFLO state by a
+non-trivial Berry phase, and demonstrate the stability region of the state on
+the zero-temperature phase diagram. Given its unique properties in both the
+quasi-particle dispersion spectra and the momentum distribution, signatures of
+the topological FFLO state can be detected using existing experimental
+techniques.",1307.2439v1
+2014-04-12,Drag force on a moving impurity in a spin-orbit coupled Bose-Einstein condensate,"We investigate the drag force on a moving impurity in a spin-orbit coupled
+Bose-Einstein condensate. We prove rigorously that the superfluid critical
+velocity is zero when the impurity moves in all but one directions, in contrast
+to the case of liquid helium and superconductor where it is finite in all
+directions. We also find that when the impurity moves in all directions except
+two special ones, the drag force has nonzero transverse component at small
+velocity. When the velocity becomes large and the states of the upper band are
+also excited, the transverse force becomes very small due to opposite
+contributions of the two bands. The characteristics of the superfluid critical
+velocity and the transverse force are results of the order by disorder
+mechanism in spin-orbit coupled boson systems.",1404.3252v1
+2014-04-24,Spin-orbit-coupled topological Fulde-Ferrell states of fermions in a harmonic trap,"Motivated by recent experimental breakthroughs in generating spin-orbit
+coupling in ultracold Fermi gases using Raman laser beams, we present a
+systematic study of spin-orbit-coupled Fermi gases confined in a
+quasi-one-dimensional trap in the presence of an in-plane Zeeman field (which
+can be realized using a finite two-photon Raman detuning). We find that a
+topological Fulde-Ferrell state will emerge, featuring finite-momentum Cooper
+pairing and zero-energy Majorana excitations localized near the edge of the
+trap based on the self-consistent Bogoliubov-de Genes (BdG) equations. We find
+analytically the wavefunctions of the Majorana modes. Finally using the
+time-dependent BdG we show how the finite-momentum pairing field manifests
+itself in the expansion dynamics of the atomic cloud.",1404.6211v1
+2014-09-18,Measurement of collective excitations in a spin-orbit-coupled Bose-Einstein condensate,"We measure the collective excitation spectrum of a spin-orbit coupled
+Bose-Einstein condensate using Bragg spectroscopy. The spin-orbit coupling is
+generated by Raman dressing of atomic hyperfine states. When the Raman detuning
+is reduced, mode softening at a finite momentum is revealed, which provides
+insight towards a supersolid-like phase transition. We find that for the
+parameters of our system, this softening stops at a finite excitation gap and
+is symmetric under a sign change of the Raman detuning. Finally, using a moving
+barrier that is swept through the BEC, we also show the effect of the
+collective excitation on the fluid dynamics.",1409.5387v2
+2014-11-27,The in-plane gradient magnetic field induced vortex lattices in spin-orbit coupled Bose-Einstein condensations,"We consider the ground-state properties of the two-component spin-orbit
+coupled ultracold bosons subject to a rotationally symmetric in-plane gradient
+magnetic field. In the non-interacting case, the ground state supports
+giant-vortices carrying large angular momenta without rotating the trap. The
+vorticity is highly tunable by varying the amplitudes and orientations of the
+magnetic field. Interactions drive the system from a giant-vortex state to
+various configurations of vortex lattice states along a ring. Vortices exhibit
+ellipse-shaped envelops with the major and minor axes determined by the
+spin-orbit coupling and healing lengths, respectively. Phase diagrams of vortex
+lattice configurations are constructed and their stabilities are analyzed.",1411.7584v1
+2015-02-04,Persistent semi-metal-like nature of epitaxial perovskite CaIrO3 thin films,"Strong spin-orbit coupled 5d transition metal based ABO3 oxides, especially
+iridates, allow tuning parameters in the phase diagram and may demonstrate
+important functionalities, for example, by means of strain effects and
+symmetry-breaking, because of the interplay between the Coulomb interactions
+and strong spin-orbit coupling. Here, we have epitaxially stabilized high
+quality thin films of perovskite (Pv) CaIrO3. Film on the best lattice-matched
+substrate shows semi-metal-like characteristics. Intriguingly, imposing tensile
+or compressive strain on the film by altering the underlying lattice-mismatched
+substrates still maintains semi-metallicity with minute modification of the
+effective correlation as tensile (compressive) strain results in tiny increases
+(decreases) of the electronic bandwidth. In addition, magnetoresistance remains
+positive with a quadratic field dependence. This persistent semi-metal-like
+nature of Pv-CaIrO3 thin films with minute changes in the effective correlation
+by strain may provide new wisdom into strong spin-orbit coupled 5d based oxide
+physics.",1502.01261v3
+2015-03-03,Field-effect control of superconductivity and Rashba spin-orbit coupling in top-gated LaAlO3/SrTiO3 devices,"The recent development in the fabrication of artificial oxide
+heterostructures opens new avenues in the field of quantum materials by
+enabling the manipulation of the charge, spin and orbital degrees of freedom.
+In this context, the discovery of two-dimensional electron gases (2-DEGs) at
+LAlO3/SrTiO3 interfaces, which exhibit both superconductivity and strong Rashba
+spin-orbit coupling (SOC), represents a major breakthrough. Here, we report on
+the realisation of a field-effect LaAlO3/SrTiO3 device, whose physical
+properties, including superconductivity and SOC, can be tuned over a wide range
+by a top-gate voltage. We derive a phase diagram, which emphasises a
+field-effect-induced superconductor-to-insulator quantum phase transition.
+Magneto-transport measurements indicate that the Rashba coupling constant
+increases linearly with electrostatic doping. Our results pave the way for the
+realisation of mesoscopic devices, where these two properties can be
+manipulated on a local scale by means of top-gates.",1503.00967v1
+2015-08-25,Absence of spin-orbit-coupling-induced effects on lattice dynamics in CePt3Si,"Motivated by model calculations for the heavy fermion superconductor CePt3Si
+predicting phonon anomalies because of anti-symmetric spin-orbit coupling we
+performed a detailed experimental study of the lattice dynamical properties of
+CePt3Si. In particular, we investigated the dispersion of transverse acoustic
+and low energy optic phonon branches along the [110] direction using inelastic
+neutron scattering. In these branches, we found deviations from our ab-initio
+lattice dynamical calculations, which overall give a good description of the
+phonon dispersion in CePt3Si. However, the agreement for the [110] transverse
+modes can be improved if we neglect the Ce 4f states, done in an additional
+calculation. We conclude that the lattice dynamics of CePt3Si are conventional
+and that the observed deviations are not related to effects of anti-symmetric
+spin-orbit-coupling. More likely, ab-initio calculations overestimate the
+exchange between different phonon branches, particularly in the presence of 4f
+electron states. Our results imply that the ASOC plays less a role in
+non-centrosymmetric superconductors than commonly believed.",1508.06048v1
+2015-09-06,Traveling Majorana solitons in a one-dimensional spin-orbit coupled Fermi superfluid,"We investigate traveling solitons of a one-dimensional spin-orbit coupled
+Fermi superfluid in both topologically trivial and non-trivial regimes by
+solving the static and time-dependent Bogoliubov-de Gennes equations. We find a
+critical velocity $v_{h}$ for traveling solitons that is much smaller than the
+value predicted using the Landau criterion due to the presence of spin-orbit
+coupling, which strongly upshifts the energy level of the soliton-induced
+Andreev bound states towards the quasi-particle scattering continuum. Above
+$v_{h}$, our time-dependent simulations in harmonic traps indicate that
+traveling solitons decay by radiating sound waves. In the topological phase, we
+predict the existence of peculiar Majorana solitons, which host two Majorana
+fermions and feature a phase jump of $\pi$ across the soliton, irrespective of
+the velocity of travel. These unusual properties of Majorana solitons may open
+an alternative way to manipulate Majorana fermions for fault-tolerant
+topological quantum computations.",1509.01803v1
+2015-10-18,Effects of spin-orbit coupling and spatial symmetries on the Josephson current in SNS junctions,"We present an analysis of the symmetries of the interference pattern of
+critical currents through a two-dimensional
+superconductor-semiconductor-superconductor junction, taking into account
+Rashba and Dresselhaus spin-orbit interaction, an arbitrarily oriented magnetic
+field, disorder, and structural asymmetries. We relate the symmetries of the
+pattern to the absence or presence of symmetries in the Hamiltonian, which
+provides a qualitative connection between easily measurable quantities and the
+spin-orbit coupling and other symmetries of the junction. We support our
+analysis with numerical calculations of the Josephson current based on a
+perturbative expansion up to eighth order in tunnel coupling between the normal
+region and the superconductors.",1510.05251v2
+2015-11-03,Motion of an Impurity in a Bose-Einstein Condensate with Weyl Spin-Orbit Coupling: Non-collinear Drag Force and Anisotropic Critical Velocity,"We consider the motion of a point-like impurity through a three-dimensional
+two-component Bose-Einstein condensate subject to Weyl spin-orbit coupling.
+Using linear-response theory, we calculate the drag force felt by the impurity
+and the associated anisotropic critical velocity from the spectrum of
+elementary excitations. The drag force is shown to be generally not collinear
+with the velocity of the impurity. This unusual behavior is a consequence of
+condensation into a finite-momentum state due to the spin-orbit coupling.",1511.00886v2
+2015-11-27,Multidimensional Josephson vortices in spin-orbit coupled Bose-Einstein condensates: snake instability and decay through vortex dipoles,"We analyze the dynamics of Josephson vortex states in two-component
+Bose-Einstein condensates with Rashba-Dresselhaus spin-orbit coupling by using
+the Gross-Pitaevskii equation. In 1D, both in homogeneous and harmonically
+trapped systems, we report on stationary states containing doubly charged,
+static Josephson vortices. In multidimensional systems, we find stable
+Josephson vortices in a regime of parameters typical of current experiments
+with $^{87}$Rb atoms. In addition, we discuss the instability regime of
+Josephson vortices in disk-shaped condensates, where the snake instability
+operates and vortex dipoles emerge. We study the rich dynamics that they
+exhibit in different regimes of the spin-orbit coupled condensate depending on
+the orientation of the Josephson vortices.",1511.08685v2
+2016-03-10,Zeeman-field-induced nontrivial topological phases in a one-dimensional spin-orbit-coupled dimerized lattice,"We study theoretically the interplay effect of Zeeman field and modulated
+spin-orbit coupling on topological properties of a one-dimensional dimerized
+lattice, known as Su-Schrieffer-Heeger model. We find that in the weak (strong)
+modulated spin-orbit coupling regime, trivial regions or nontrivial ones with
+two pairs of zero-energy states can be turned into nontrivial regions by
+applying a uniform (staggered) perpendicular Zeeman field through a topological
+phase transition. Furthermore, the resulting nontrivial phase hosting a pair of
+zero-energy boundary states can survive within a certain range of the
+perpendicular Zeeman field magnitude. Due to the effective time-reversal,
+particle-hole, chiral, and inversion symmetries, in the presence of either
+uniform or staggered perpendicular Zeeman field, the topological class of the
+system is BDI which can be characterized by $\mathbbm{Z}$ index. We also
+examine the robustness of the nontrivial phase by breaking the underlying
+symmetries giving rise that inversion symmetry plays an important role.",1603.03282v2
+2016-07-13,Universal trimers emerging from a spin-orbit coupled Fermi sea,"We report the existence of a universal trimer state induced by an impurity
+interacting with a two-component spin-orbit coupled Fermi gas in two
+dimensions. In the zero-density limit with a vanishing Fermi sea, the trimer is
+stabilized by the symmetry of the single-particle spectrum under spin-orbit
+coupling, and is therefore {\it universal} against the short-range details of
+the interaction potential. When the Fermi energy increases, we show that the
+trimer is further stabilized by particle-hole fluctuations over a considerable
+parameter region. We map out the phase diagram consisting of trimers, dimers,
+and polarons, and discuss the detection of these states using radio-frequency
+spectroscopy. The universal trimer revealed in our work is a direct
+manifestation of intriguing three-body correlations emerging from a many-body
+environment, which, in our case, is cooperatively supported by the
+single-particle spectral symmetry and the collective particle-hole excitations.",1607.03580v2
+2016-07-27,Anderson transition of cold atoms with synthetic spin-orbit coupling in two-dimensional speckle potentials,"We investigate the metal-insulator transition occurring in two-dimensional
+(2D) systems of noninteracting atoms in the presence of artificial spin-orbit
+interactions and a spatially correlated disorder generated by laser speckles.
+Based on a high order discretization scheme, we calculate the precise position
+of the mobility edge and verify that the transition belongs to the symplectic
+universality class. We show that the mobility edge depends strongly on the
+mixing angle between Rashba and Dresselhaus spin-orbit couplings. For equal
+couplings a non-power-law divergence is found, signaling the crossing to the
+orthogonal class, where such a 2D transition is forbidden.",1607.08164v2
+2016-09-15,Synthetic dimensions and spin-orbit coupling with an optical clock transition,"We demonstrate a novel way of synthesizing spin-orbit interactions in
+ultracold quantum gases, based on a single-photon optical clock transition
+coupling two long-lived electronic states of two-electron $^{173}$Yb atoms. By
+mapping the electronic states onto effective sites along a synthetic
+""electronic"" dimension, we have engineered synthetic fermionic ladders with
+tunable magnetic fluxes. We have detected the spin-orbit coupling with
+fiber-link-enhanced clock spectroscopy and directly measured the emergence of
+chiral edge currents, probing them as a function of the magnetic field flux.
+These results open new directions for the investigation of topological states
+of matter with ultracold atomic gases.",1609.04800v2
+2016-09-18,Hidden long-range order in a spin-orbit coupled two-dimensional Bose gas,"A spin-orbit coupled two-dimensional (2D) Bose gas is shown to simultaneously
+possess quasi and true long-range order in the total and relative phase
+sectors, respectively. The total phase undergoes a Berenzinskii-
+Kosterlitz-Thouless transition to a low temperature phase with quasi long-range
+order, as expected for a two- dimensional quantum gas. Additionally, the
+relative phase undergoes an Ising-type transition building up true long-range
+order, which is induced by the anisotropic spin-orbit coupling. Based on the
+Bogoliubov approach, expressions for the total- and relative-phase fluctuations
+are derived analytically for the low temperature regime. Numerical simulations
+of the stochastic projected Gross-Pitaevskii equation (SPGPE) give a good
+agreement with the analytical predictions.",1609.05464v2
+2016-09-30,BCS pairing state of a Dilute Bose Gas with Spin-Orbit Coupling,"We study a two-component Bose gas with a symmetric spin-orbit coupling, and
+find that two atoms can form a bound state with any intra- or inter-species
+scattering length. Consequently, in the dilute limit, the
+Bardeen-Cooper-Shrieffer (BCS) pairing state of bosons can be formed with
+weakly-attractive inter-species and repulsive intra-species interactions. The
+quasiparticle excitation energies are anisotropic due to spin-orbit coupling.
+This BCS paring state is energetically favored over Bose-Einstein condensation
+(BEC) of atoms at low densities. As the density increases, there is a
+first-order transition from the BCS to BEC states.",1609.09691v3
+2016-10-17,Two-dimensional lattice solitons in polariton condensates with spin-orbit coupling,"We study two-dimensional fundamental and vortex solitons in polariton
+condensates with spin-orbit coupling and Zeeman splitting evolving in square
+arrays of microcavity pillars. Due to repulsive excitonic nonlinearity such
+states are encountered in finite gaps in the spectrum of the periodic array.
+Spin-orbit coupling between two polarization components stemming from TE-TM
+energy splitting of the cavity photons acting together with Zeeman splitting
+lifts the degeneracy between vortex solitons with opposite topological charges
+and makes their density profiles different for a fixed energy. This results in
+formation of four distinct families of vortex solitons with topological charges
+m=+-1, all of which can be stable. At the same time, only two stable families
+of fundamental gap solitons characterized by domination of different
+polarization components are encountered.",1610.05286v1
+2017-02-15,Majorana Quasi-Particles Protected by $\mathbb{Z}_2$ Angular Momentum Conservation,"We show how angular momentum conservation can stabilise a symmetry-protected
+quasi-topological phase of matter supporting Majorana quasi-particles as edge
+modes in one-dimensional cold atom gases. We investigate a number-conserving
+four-species Hubbard model in the presence of spin-orbit coupling. The latter
+reduces the global spin symmetry to an angular momentum parity symmetry, which
+provides an extremely robust protection mechanism that does not rely on any
+coupling to additional reservoirs. The emergence of Majorana edge modes is
+elucidated using field theory techniques, and corroborated by
+density-matrix-renormalization-group simulations. Our results pave the way
+toward the observation of Majorana edge modes with alkaline-earth-like fermions
+in optical lattices, where all basic ingredients for our recipe - spin-orbit
+coupling and strong inter-orbital interactions - have been experimentally
+realized over the last two years.",1702.04733v2
+2017-08-08,Magnetic Chern Insulators in a monolayer of Transition Metal Trichalcogenides,"A monolayer of transition metal trichalcogenides has received a lot of
+attention as potential two dimensional magnetic materials. The system has a
+honeycomb structure of transition metal ions, where both spin-orbit coupling
+and electron correlation effect play an important role. Here, motivated by
+these transition metal series with effective doping or mixed valence case, we
+propose the possible realization of magnetic Chern insulators at quarter filled
+honeycomb lattice. We show that the interplay of intrinsic spin-orbit coupling
+and electron correlation opens a wide region of ferromagnetic Chern insulating
+phases in between metals and normal insulators. Within the mean field
+approximation, we present the phase diagram of a quarter filled Kane-Mele
+Hubbard model and also discuss the effects of Rashba spin-orbit coupling and
+nearest neighbor interactions on it.",1708.02493v1
+2018-02-28,Absence of Dirac states in BaZnBi$_{2}$ induced by spin-orbit coupling,"We report magnetotransport properties of BaZnBi$_{2}$ single crystals.
+Whereas electronic structure features Dirac states, such states are removed
+from the Fermi level by spin-orbit coupling (SOC) and consequently electronic
+transport is dominated by the small hole and electron pockets. Our results are
+consistent with three dimensional (3D) but also with quasi two dimensional (2D)
+portions of the Fermi surface. The spin-orbit coupling-induced gap in Dirac
+states is much larger when compared to isostructural SrMnBi$_{2}$. This
+suggests that not only long range magnetic order but also mass of the alkaline
+earth atoms A in ABX$_{2}$ (A = alkaine earth, B = transition metal and
+X=Bi/Sb) are important for the presence of low-energy states obeying the
+relativistic Dirac equation at the Fermi surface",1802.10593v1
+2018-04-03,Searching for Supersolidity in Ultracold Atomic Bose Condensates with Rashba Spin-Orbit Coupling,"We developed functional integral formulation for the stripe phase of a spinor
+Bose-Einstein condensates with Rashba spin-orbit coupling. The excitation
+spectrum is found to exhibit double gapless band structures, identified to be
+two Goldstone modes resulting from spontaneously broken internal gauge symmetry
+and translational invariance symmetry. The sound velocities display anisotropic
+behaviors with the lower branch vanishes in the direction perpendicular to the
+stripe in the x-y plane. At the transition point between the plane wave phase
+and the stripe phase, physical quantities such as fluctuation correction to the
+ground state energy and quantum depletion of the condensates exhibit
+discontinuity, characteristic of the first order phase transition. Despite
+strong quantum fluctuations induced by Rashba spin-orbit coupling, we show that
+the supersolid phase is stable against quantum depletion. Finally we extend our
+formulation to finite temperatures to account for interactions between
+excitations.",1804.01163v1
+2018-04-13,Dzyaloshinskii-Moriya Interaction between Multipolar Moments in $5d^1$ Systems,"We propose a new type of Dzyaloshinskii-Moriya (DM) interactions which act on
+high-rank multipolar moments such as quadrupolar and octupolar moments. Here we
+consider 5d1 systems with broken spatial inversion symmetry, where the
+interplay of electron correlation, the spin-orbit coupling, and inversion
+symmetry breaking plays a crucial role. Using a numerical diagonalization on a
+two-site multiorbital Hubbard model, we reveal that anti-symmetric products of
+multipole operators have finite expectation values, indicating the existence of
+DM interactions for multipoles. We also find that the spin-orbit coupling
+dependences of DM interactions for multipoles are significantly different
+depending on the lattice structure. Finally, we discuss the numerical results
+for small and large spin-orbit coupling region by using perturbative analysis.",1804.04874v2
+2018-04-30,Analytic and numeric computation of edge states and conductivity of a Kane-Mele nanoribbon,"We compute analytic expressions for the edge states in a zigzag Kane-Mele
+nanoribbon (KMNR) by solving the eigenvalue equations in presence of intrinsic
+and Rashba spin-orbit couplings. Owing to the P-T symmetry of the Hamiltonian
+the edge states are protected by topological invariance and hence are found to
+be robust. We have done a systematic study for each of the above cases, for
+example, a pristine graphene, graphene with an intrinsic spin-orbit coupling,
+graphene with a Rashba spin-orbit coupling, a Kane-Mele nanoribbon and
+supported our results on the robustness of the edge states by analytic
+computation of the electronic probability amplitudes, the local density of
+states (LDOS), band structures and the conductance spectra.",1804.11076v3
+2020-07-22,Tomography of zero-energy end modes in topological superconducting wires,"We characterize the Majorana zero modes in topological hybrid
+superconductor-semiconductor wires with spin-orbit coupling and magnetic field,
+in terms of generalized Bloch coordinates $\varphi, \theta, \delta$, and
+analyze their transformation under SU(2) rotations. We show that, when the
+spin-orbit coupling and the magnetic field are perpendicular, $\varphi$ and
+$\delta$ are universal in an appropriate coordinate system. We use these
+geometric properties to explain the behavior of the Josephson current in
+junctions of two wires with different orientations of the magnetic field and/or
+the spin-orbit coupling. We show how to extract from there, the angle $\theta$,
+hence providing a full description of the Majorana modes.",2007.11619v4
+2020-07-30,Electron-electron scattering and transport properties of spin-orbit coupled electron gas,"We calculate the electrical and thermal conductivity of a two-dimensional
+electron gas with strong spin--orbit coupling in which the scattering is
+dominated by electron--electron collisions. Despite the apparent absence of
+Galilean invariance in the system, the two-particle scattering does not affect
+the electrical conductivity above the band-crossing point where both helicity
+bands are filled. Below the band-crossing point where one helicity band is
+empty, switching on the electron--electron scattering leads only to a limited
+decrease of the electrical conductivity, so that its high-temperature value is
+independent of the scattering intensity. In contrast to this, thermal
+conductivity is not strongly affected by the spin-orbit coupling and exhibits
+only a kink as the Fermi level passes through the band-crossing point.",2007.15612v2
+2017-04-24,A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd$_2$Re$_2$O$_7$,"Strong electron interactions can drive metallic systems toward a variety of
+well-known symmetry-broken phases, but the instabilities of correlated metals
+with strong spin-orbit coupling have only recently begun to be explored. We
+uncovered a multipolar nematic phase of matter in the metallic pyrochlore
+Cd$_2$Re$_2$O$_7$ using spatially resolved second-harmonic optical anisotropy
+measurements. Like previously discovered electronic nematic phases, this
+multipolar phase spontaneously breaks rotational symmetry while preserving
+translational invariance. However, it has the distinguishing property of being
+odd under spatial inversion, which is allowed only in the presence of
+spin-orbit coupling. By examining the critical behavior of the multipolar
+nematic order parameter, we show that it drives the thermal phase transition
+near 200 kelvin in Cd$_2$Re$_2$O$_7$ and induces a parity-breaking lattice
+distortion as a secondary order.",1704.07399v1
+2011-11-08,Topological Superfluid in one-dimensional Ultracold Atomic System with Spin-Orbit Coupling,"We propose a one-dimensional Hamiltonian $H_{1D}$ which supports Majorana
+fermions when $d_{x^{2}-y^{2}}$-wave superfluid appears in the ultracold atomic
+system and obtain the phase-separation diagrams both for the
+time-reversal-invariant case and time-reversal-symmetry-breaking case. From the
+phase-separation diagrams, we find that the single Majorana fermions exist in
+the topological superfluid region, and we can reach this region by tuning the
+chemical potential $\mu$ and spin-orbit coupling $\alpha_{R}$. Importantly, the
+spin-orbit coupling has realized in ultracold atoms by the recent experimental
+achievement of synthetic gauge field, therefore, our one-dimensional ultra-cold
+atomic system described by $H_{1D}$ is a promising platform to find the
+mysterious Majorana fermions.",1111.1952v2
+2011-11-09,Majorana fermions in superconducting nanowires without spin-orbit coupling,"We show that confined Majorana fermions can exist in nanowires with proximity
+induced s-wave superconducting pairing if the direction of an external magnetic
+field rotates along the wire. The system is equivalent to nanowires with
+Rashba-type spin-orbit coupling, with strength proportional to the derivative
+of the field angle. For realistic parameters, we demonstrate that a set of
+permanent magnets can bring a nearby nanowire into the topologically
+non-trivial phase with localized Majorana modes at its ends. Without the
+requirement of spin-orbit coupling this opens up for a new route for
+demonstration and design of Majorana fermion systems.",1111.2129v4
+2014-05-04,Three-component topological superfluid in one-dimensional Fermi gases with spin-orbit coupling,"We theoretically investigate one-dimensional three-component
+spin-orbit-coupled Fermi gases in the presence of Zeeman field. By solving the
+Bogoliubov-de-Gennes equations, we obtain the phase diagram at given chemical
+potential and order parameter. We show that the system undergoes a phase
+transition from Bardeen-Cooper-Schrieffer superfluid to topological superfluid
+as increasing the intensity of Zeeman field. By comparing to the two-component
+system, we find, besides the topological phase transition from the trivial
+superfluid to nontrivial topological superfluid, the system can always be in a
+nontrivial topological superfluid, and there are two Majorana zero energy
+regions while increasing the magnetic field. We find the three-component
+spin-orbit-coupled Fermi gases in certain parameter range is more optimizing
+for experimental realization due to the smaller magnetic field needed. We
+therefore propose a promising candidate for realizing topological superfluid.",1405.0709v2
+2014-06-09,Chiral nanophotonic waveguide interface based on spin-orbit coupling of light,"Controlling the flow of light by means of nanophotonic waveguides has the
+potential of transforming integrated information processing much in the same
+way that conventional glass fibers have revolutionized global communication.
+Owing to the strong transverse confinement of the light, such waveguides give
+rise to a coupling between the internal spin of the guided photons and their
+orbital angular momentum. Here, we employ this spin-orbit coupling of light to
+break the mirror symmetry of the scattering of light by a single gold
+nanoparticle on the surface of a nanophotonic waveguide. We thereby realize a
+chiral waveguide coupler in which the handedness of the incident light
+determines the direction of propagation in the waveguide. Using this effect, we
+control the directionality of the scattering process and direct up to 94% of
+the incoupled light into a given direction. This enables novel ways for
+controlling and manipulating light in optical waveguides and nanophotonic
+structures as well as for the design of integrated optical sensors.",1406.2184v1
+2015-12-19,Spin-orbit-angular-momentum coupling in a spin-1 Bose-Einstein condensate,"We propose a simple model with spin and orbit angular momentum coupling in a
+spin-1 Bose- Einstein condensate, where three internal atomic states are Raman
+coupled by a pair of co- propagating Laguerre-Gaussian beams. The resulting
+Raman transition imposes a transfer of orbital angular momentum between photons
+and the condensate in a spin-dependent way. Focusing on a regime where the
+single-particle ground state is nearly three-fold degenerate, we show that the
+weak interatomic interaction in the condensate produces a rich phase diagram,
+and that a many-body Rabi oscillation between two quantum phases can be induced
+by a sudden quench of the quadratic Zeeman shift. We carried out our
+calculations using both a variational method and a full numerical method, and
+found excellent agreement.",1512.06276v1
+2017-10-17,Momentum-space Aharonov-Bohm interferometry in Rashba spin-orbit coupled Bose-Einstein condensates,"Since the recent experimental realization of synthetic Rashba spin-orbit
+coupling paved a new avenue for exploring and engineering topological phases in
+ultracold atoms, a precise, solid detection of Berry phase has been desired for
+unequivocal characterization of system topology. Here, we propose a scheme to
+conduct momentum-space Aharonov-Bohm interferometry in a Rashba spin-orbit
+coupled Bose-Einstein condensate with a sudden change of in-plane Zeeman field,
+capable of measuring the Berry phase of Rashba energy bands. We find that the
+Berry phase with the presence of a Dirac point is directly revealed by a robust
+dark interference fringe, and that as a function of external Zeeman field is
+characterized by the contrast of fringes. We also build a variational model
+describing the interference process with semiclassical equations of motion of
+essential dynamical quantities, which lead to agreeable trajectories and
+geometric phases with the real-time simulation of Gross-Pitaevskii equation.
+Our study would provide timely guidance for the experimental detection of Berry
+phase in ultracold atomic systems and help further investigation on their
+interference dynamics in momentum space.",1710.06403v1
+2017-12-23,Three-dimensional vortex-bright solitons in a spin-orbit coupled spin-$1$ condensate,"We demonstrate stable and metastable vortex-bright solitons in a
+three-dimensional spin-orbit-coupled three-component hyperfine spin-1
+Bose-Einstein condensate (BEC) using numerical solution and variational
+approximation of a mean-field model. The spin-orbit coupling provides
+attraction to form vortex-bright solitons in both attractive and repulsive
+spinor BECs. The ground state of these vortex-bright solitons is axially
+symmetric for weak polar interaction. For a sufficiently strong ferromagnetic
+interaction, we observe the emergence of a fully asymmetric vortex-bright
+soliton as the ground state. We also numerically investigate moving solitons.
+The present mean-field model is not Galilean invariant, and we use a
+Galilean-transformed mean-field model for generating the moving solitons.",1712.09337v1
+2018-01-15,Negative-mass effects in spin-orbit coupled Bose-Einstein condensates,"Negative effective masses can be realised by engineering the dispersion
+relation in a variety of quantum systems. A recent experiment with spin-orbit
+coupled Bose-Einstein condensates has shown that a negative effective mass can
+halt the free expansion of the condensate and produce fringes in the density
+[M. Khamehchi et al., Phys. Rev. Lett. 118, 155301 (2017)]. Here, we show that
+the observed fringes are due to the negativity of only one of the two effective
+mass parameters that characterise the dispersion, which leads to previously
+predicted self-interference of the wave packet. We show how confgurations are
+nevertheless accessible to spin-orbit coupled Bose-Einstein condensates where
+both mass parameters controlling the propagation and diffusion of the
+condensate are negative, resulting in the novel phenomenon of
+counter-propagating self-interfering packets.",1801.04779v2
+2018-09-15,Artificial $SU(3)$ Spin-Orbit Coupling and Exotic Mott Insulators,"Motivated by recent progress in the realization of artificial gauge fields
+and $SU(N)$ Mott insulators using alkaline-earth-like atoms in optical
+lattices, we develop an unbiased $SU(N)$ real-space dynamical mean-field theory
+(DMFT) approach to study the effect of spin-orbit coupling and onsite Hubbard
+interaction $U$ on $SU(3)$ fermionic systems. We investigate the behavior of
+the local magnetization, double occupancies, and the triple occupancy versus
+the Hubbard interaction across the metal to Mott insulator transition. We map
+out the magnetic phase diagram in the large-$U$ limit and show that the
+spin-orbit coupling can stabilize long-range orders such as ferromagnet,
+spiral, and stripes with different orientations in $SU(3)$ Mott insulators.",1809.05704v2
+2018-10-03,Possible origin of the absence of magnetic order in LiOsO$_3$: Spin-orbit coupling controlled ground state,"LiOsO$_3$ is the first experimentally confirmed polar metal with
+ferroelectric-like distortion. One puzzling experimental fact is its
+paramagnetic state down to very low temperature with negligible magnetic
+moment, which is anomalous considering its $5d^3$ electron configuration since
+other osmium oxides (e.g. NaOsO$_3$) with $5d^3$ Os ions are magnetic. Here the
+magnetic and electronic properties of LiOsO$_3$ are re-investigated carefully
+using the first-principles density functional theory. Our calculations reveal
+that the magnetic state of LiOsO$_3$ can be completely suppressed by the
+spin-orbit coupling. The subtle balance between significant spin-orbit coupling
+and weak Hubbard $U$ of $5d$ electrons can explain both the nonmagnetic
+LiOsO$_3$ and magnetic NaOsO$_3$. Our work provides a reasonable understanding
+of the long-standing puzzle of magnetism in some osmium oxides.",1810.01639v1
+2019-06-10,Successive Symmetry Breaking in a Jeff = 3/2 Quartet in the Spin-Orbit Coupled Insulator Ba2MgReO6,"We report on the cubic double perovskite Ba2MgReO6 containing Re6+ ions with
+the 5d1 electron configuration. Resistivity, magnetization, and heat capacity
+measurements using single crystals show that the compound is a Mott insulator
+with a magnetic transition at Tm = 18 K, which is accompanied by a weak
+ferromagnetic moment with [110] anisotropy. Another transition is observed at
+Tq = 33 K in heat capacity, where the inverse of magnetic susceptibility
+changes its slope, indicating a substantial change in the electronic state. The
+significance of spin-orbit coupling is revealed by the reduced effective
+magnetic moment of ~0.68{\mu}B at high temperature above Tq and the total
+electronic entropy close to Rln4. These features indicate that Ba2MgReO6 is a
+spin-orbit coupled Mott insulator possessing a Jeff = 3/2 quartet state, which
+exhibits quadrupolar and dipolar orders at Tq and Tm, respectively.",1906.03802v1
+2019-09-24,Bogoliubov Fermi surfaces stabilized by spin-orbit coupling,"It was recently understood that centrosymmetric multiband superconductors
+that break time-reversal symmetry generically show Fermi surfaces of Bogoliubov
+quasiparticles. We investigate the thermodynamic stability of these Bogoliubov
+Fermi surfaces in a paradigmatic model. To that end, we construct the
+mean-field phase diagram as a function of spin-orbit coupling and temperature.
+It confirms the prediction that a pairing state with Bogoliubov Fermi surfaces
+can be stabilized at moderate spin-orbit coupling strengths. The multiband
+nature of the model also gives rise to a first-order phase transition, which
+can be explained by the competition of intra- and interband pairing and is
+strongly affected by cubic anisotropy. For the state with Bogoliubov Fermi
+surfaces, we also discuss experimental signatures in terms of the residual
+density of states and the induced magnetic order. Our results show that
+Bogoliubov Fermi surfaces of experimentally relevant size can be
+thermodynamically stable.",1909.10956v2
+2019-10-20,Dissipation-facilitated molecules in a Fermi gas with non-Hermitian spin-orbit coupling,"We study the impact of non-Hermiticity on the molecule formation in a
+two-component spin-orbit-coupled Fermi gas near a wide Feshbach resonance.
+Under an experimentally feasible configuration where the two-photon Raman
+process is dissipative, the Raman-induced synthetic spin-orbit coupling
+acquires a complex strength. Remarkably, dissipation of the system facilitates
+the formation and binding of molecules, which, despite their dissipative nature
+and finite lifetime, exist over a wider parameter regime than in the
+corresponding Hermitian system. These dissipation-facilitated molecules can be
+probed by the inverse radio-frequency (rf) spectroscopy, provided the Raman
+lasers are blue detuned to the excited state. The effects of dissipation
+manifest in the rf spectra as shifted peaks with broadened widths, which serve
+as a clear experimental signature. Our results, readily observable in current
+cold-atom experiments, shed light on the fascinating interplay of
+non-Hermiticity and interaction in few- and many-body open quantum systems.",1910.08890v3
+2012-05-15,"Magnetic couplings, optical spectra, and spin-orbit exciton in 5d electron Mott insulator Sr2IrO4","Based on the microscopic model including strong spin-orbit coupling, on-site
+Coulomb and Hund's interactions, as well as crystal field effects, we have
+investigated magnetic and optical properties of Sr2IrO4. Taking into account
+all possible intermediate state multiplets generated by virtual hoppings of
+electrons, we calculated the isotropic Heisenberg, pseudodipolar, and
+Dzyaloshinsky-Moriya coupling constants, which describe the experiment quite
+well. We have also evaluated the optical conductivity {\sigma}({\omega}) by
+employing the exact diagonalization method on small clusters, and obtained two
+peaks at \sim 0.5 and \sim 1.0 eV in agreement with experiment. The two peak
+structure of {\sigma}({\omega}) arises from the unusual Fano-type overlap
+between electron-hole continuum of the Jeff = 1/2 band and the intrasite
+spin-orbit exciton observed recently in Sr2IrO4 by resonant x-ray scattering.",1205.3289v3
+2017-05-24,Ferromagnetic transition in a one-dimensional spin-orbit-coupled metal and its mapping to a critical point in smectic liquid crystals,"We study the quantum phase transition between a paramagnetic and
+ferromagnetic metal in the presence of Rashba spin-orbit coupling in one
+dimension. Using bosonization, we analyze the transition by means of
+renormalization group, controlled by an $\varepsilon$-expansion around the
+upper critical dimension of two. We show that the presence of Rashba spin-orbit
+coupling allows for a new nonlinear term in the bosonized action, which
+generically leads to a fluctuation driven first-order transition. We further
+demonstrate that the Euclidean action of this system maps onto a classical
+smectic-A -- C phase transition in a magnetic field in two dimensions. We show
+that the smectic transition is second-order and is controlled by a new critical
+point.",1705.08890v3
+2018-06-04,Spin-Orbit induced phase-shift in Bi$_{2}$Se$_{3}$ Josephson junctions,"The transmission of Cooper pairs between two weakly coupled superconductors
+produces a superfluid current and a phase difference; the celebrated Josephson
+effect. Because of time-reversal and parity symmetries, there is no Josephson
+current without a phase difference between two superconductors. Reciprocally,
+when those two symmetries are broken, an anomalous supercurrent can exist in
+the absence of phase bias or, equivalently, an anomalous phase shift
+$\varphi_0$ can exist in the absence of a superfluid current. We report on the
+observation of an anomalous phase shift $\varphi_0$ in hybrid Josephson
+junctions fabricated with the topological insulator Bi$_2$Se$_3$ submitted to
+an in-plane magnetic field. This anomalous phase shift $\varphi_0$ is observed
+directly through measurements of the current-phase relationship in a Josephson
+interferometer. This result provides a direct measurement of the spin-orbit
+coupling strength and open new possibilities for phase-controlled Josephson
+devices made from materials with strong spin-orbit coupling.",1806.01406v2
+2019-03-27,Stable multi-ring and rotating solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates with a radially-periodic potential,"We consider two-dimensional spin-orbit coupled atomic Bose-Einstein
+condensate in a radially-periodic potential. The system supports different
+types of stable self-sustained states including radially-symmetric
+vorticity-carrying modes with different topological charges in two spinor
+components that may have multiring profiles and at the same time remain
+remarkably stable for repulsive interactions. Solitons of the second type show
+persistent rotation with constant angular frequency. They can be stable for
+both repulsive and attractive interatomic interactions. Due to inequivalence
+between clockwise and counterclockwise rotation directions introduced by
+spin-orbit coupling, the properties of such solitons strongly differ for
+positive and negative rotation frequencies. Collision of solitons located in
+the same or different rings is accompanied by change of the rotation frequency
+that depends on the phase difference between colliding solitons.",1903.11453v1
+2019-08-02,Geometric contribution to the Goldstone mode in spin-orbit coupled Fermi superfluids,"The so-called quantum metric tensor is a band-structure invariant whose
+measure corresponds to the quantum distance between nearby states in the
+Hilbert space, characterizing the geometry of the underlying quantum states. In
+the context of spin-orbit coupled Fermi gases, we recently proposed that the
+quantum metric has a partial control over all those superfluid properties that
+depend explicitly on the mass of the superfluid carriers, i.e., the
+effective-mass tensor of the corresponding (two- or many-body) bound state.
+Here we scrutinize this finding by analyzing the collective phase and amplitude
+excitations at zero temperature. In particular to the Goldstone mode, we
+present extensive numerical calculations for the Weyl and Rashba spin-orbit
+couplings, revealing that, despite being small, the geometric contribution is
+solely responsible for the nonmonotonic evolution of the sound velocity in the
+BCS-BEC crossover.",1908.00818v2
+2020-10-22,Effects of optical lattices on bright solitons in spin-orbit coupled Bose-Einstein condensates,"The stationary bright solitons that appear in the ground state of the
+spin-orbit coupled Bose-Einstein condensate (SOC-BEC) exhibit nodes. We
+consider SOC-BEC in combined linear and nonlinear optical lattices and study
+their effects on the matter-wave bright soliton and find that the parameters of
+the nonlinear lattice or atomic scattering length can be judiciously
+manipulated to have useful control over the nodes of the soliton. It is seen
+that the soliton with large number of nodes is less stable compared to one
+having fewer number of nodes. We infer that that the synthetic spin-orbit
+coupling induces instability in the ordinary matter-wave soliton.",2010.11888v2
+2020-11-12,"Optical Hall response in spin-orbit coupled metals: Comparative study of magnetic cluster monopole, quadrupole, and toroidal orders","The optical Hall response is theoretically studied for spin-orbit coupled
+metals with ferroic orders of cluster-type magnetic multipoles. We find that
+different magnetic multipoles give rise to distinct spectra in the optical Hall
+conductivity. In the cases of monopole and quadrupole orders, the optical Hall
+response appears predominantly in high- and low-energy regions, which
+correspond to the energy scales of electron correlation and kinetic energy,
+respectively, while the response is dispersed and rather weak in the case of
+toroidal order. By decomposing the spectra into different interband
+contributions, we reveal selection rules stemming from the interplay between
+the antisymmetric spin-orbit coupling and the underlying multipoles. Our
+results suggest that the optical Hall measurement is useful to detect and
+distinguish the cluster-type magnetic multipole orders.",2011.06267v1
+2021-03-16,Floquet engineering of Mott insulators with strong spin-orbit coupling,"We propose a method for controlling the exchange interactions of Mott
+insulators with strong spin-orbit coupling. We consider a multiorbital system
+with strong spin-orbit coupling and a circularly polarized light field and
+derive its effective Hamiltonian in the strong-interaction limit. Applying this
+theory to a minimal model of $\alpha$-RuCl$_{3}$, we show that the magnitudes
+and signs of three exchange interactions, $J$, $K$, and $\Gamma$, can be
+changed simultaneously. Then, considering another case in which one of the
+hopping integrals has a different value and the other parameters are the same
+as those for $\alpha$-RuCl$_{3}$, we show that the Heisenberg interaction $J$
+can be made much smaller than the anisotropic exchange interactions $K$ and
+$\Gamma$.",2103.08941v1
+2021-08-09,Interfacial control of vortex-limited critical current in type II superconductor films,"In a small subset of type II superconductor films, the critical current is
+determined by a weakened Bean-Livingston barrier posed by the film surfaces to
+vortex penetration into the sample. A film property thus depends sensitively on
+the surface or interface to an adjacent material. We theoretically investigate
+the dependence of vortex barrier and critical current in such films on the
+Rashba spin-orbit coupling at their interfaces with adjacent materials.
+Considering an interface with a magnetic insulator, we find the spontaneous
+supercurrent resulting from the exchange field and interfacial spin-orbit
+coupling to substantially modify the vortex surface barrier, consistent with a
+previous prediction. Thus, we show that the critical currents in
+superconductor-magnet heterostructures can be controlled, and even enhanced,
+via the interfacial spin-orbit coupling. Since the latter can be controlled via
+a gate voltage, our analysis predicts a class of heterostructures amenable to
+gate-voltage modulation of superconducting critical currents. It also sheds
+light on the recently observed gate-voltage enhancement of critical current in
+NbN superconducting films.",2108.04263v2
+2021-10-08,Two types of dark solitons in a spin-orbit-coupled Fermi gas,"Dark solitons in quantum fluids are well known nonlinear excitations that are
+usually characterized by a single length scale associated with the underlying
+background fluid. We show that in the presence of spin-orbit coupling and a
+linear Zeeman field, superfluid Fermi gases support two different types of
+nonlinear excitations featured by corresponding length scales related to the
+existence of two Fermi surfaces. Only one of these types, which occurs for
+finite spin-orbit coupling and a Zeeman field, survives to the topological
+phase transition, and is therefore capable to sustain Majorana zero modes. At
+the point of the emergence of this soliton for varying the Zeeman field, the
+associated Andreev bound states present a minigap that vanishes for practical
+purposes, in spite of lacking the reality condition of Majorana modes.",2110.03972v2
+2022-01-05,Non-Hermitian skin effect in a spin-orbit-coupled Bose-Einstein condensate,"We study a Bose-Einstein condensate of ultracold atoms subject to a
+non-Hermitian spin-orbit coupling, where the system acquires non-Hermitian skin
+effect under the interplay of spin-orbit coupling and laser-induced atom loss.
+The presence of the non-Hermitian skin effect is confirmed through its key
+signatures in term of the spectral winding under the periodic boundary
+condition, the accumulation of eigen wavefunctions at boundaries under an open
+boundary condition, as well as bulk dynamics signaled by a directional flow. We
+show that the bulk dynamics in particular serves as a convenient signal for
+experimental detection. The impact of interaction and trapping potentials are
+also discussed based on non-Hermitian Gross-Pitaevskii equations. Our work
+demonstrates that the non-Hermitian skin effect and its rich implications in
+topology, dynamics and beyond are well within reach of current cold-atom
+experiments.",2201.01580v2
+2022-06-23,Time Translation Symmetry Breaking in an Isolated Spin-Orbit-Coupled Fluid of Light,"We study the interplay between intrinsic spin-orbit coupling and nonlinear
+photon-photon interactions in a nonparaxial, elliptically polarized fluid of
+light propagating in a bulk Kerr medium. We find that in situations where the
+nonlinear interactions induce birefringence, i.e., a polarization-dependent
+nonlinear refractive index, their interplay with spin-orbit coupling results in
+an interference between the two polarization components of the fluid traveling
+at different wave vectors, which entails the breaking of translation symmetry
+along the propagation direction. This phenomenon leads to a Floquet band
+structure in the Bogoliubov spectrum of the fluid, and to characteristic
+oscillations of its intensity correlations. We characterize these oscillations
+in detail and point out their exponential growth at large propagation
+distances, revealing the presence of parametric resonances.",2206.11714v2
+2022-10-29,Spin-orbital effect on polariton state in traps,"I discuss similitude and differences of spin-orbital effects for electrons in
+quantum wells with the Rashba coupling and for polaritons in semiconductor
+microcavities with TE-TM splitting. Contrary to the case of electron, the
+ground state of polariton in the trap can be non-degenerate and can possess
+specific polarization structure. For the case of azimuthally symmetric trap and
+sufficiently strong spin-orbital coupling, the ground state is either radial or
+azimuthal vortex, depending on the sign of the coupling constant. The effect is
+strongly enhanced for polaritons trapped in a ring, where even weak TE-TM
+splitting results in formation of vorticity and definite polarization of the
+ground state. The Hamiltonian for quasi-1D motion of polaritons in the ring is
+derived and it is shown the the dispersion of polaritons depend qualitatively
+on the curvature of the ring.",2210.16700v1
+2022-11-18,Squeezing and overcoming the Heisenberg scaling with spin-orbit coupled quantum gases,"We predict that exploiting spin-orbit coupling in a harmonically trapped
+spinor quantum gas can lead to scaling of the optimal measurement precision
+beyond the Heisenberg scaling. We show that quadratic scaling with the number
+of atoms can be facilitated via squeezed center-of-mass excitations of the
+atomic motion using a 1D spin-orbit coupled fermions or strongly interacting
+bosons (Tonks-Girardeau gas). Based on predictions derived from analytic
+calculations of the corresponding quantum Fisher information, we then introduce
+a protocol which overcomes the Heisenberg scaling (and limit) with help of a
+tailored excited and entangled many-body state of a non-interacting
+Bose-Einstein condensate. We identify corresponding optimal measurements and
+argue that even finite temperature as a source of decoherence is, in principle,
+rather favorable for the obtainable precision scaling.",2211.10436v1
+2022-11-28,Intrinsic anomalous Hall effect across the magnetic phase transition of a spin-orbit-coupled Bose-Einstein condensate,"We study theoretically the zero temperature intrinsic anomalous Hall effect
+in an experimentally realized 2D spin-orbit coupled Bose gas. For anisotropic
+atomic interactions and as the spin-orbit coupling strength increases, the
+system undergoes a ground state phase transition from states exhibiting a total
+in-plane magnetization to those with a perpendicular magnetization along the
+$z$ direction. We show that finite frequency, or ac, Hall responses exist in
+both phases in the absence of an artificial magnetic field, as a result of
+finite inter-band transitions. However, the characteristics of the anomalous
+Hall responses are drastically different in these two phases because of the
+different symmetries preserved by the corresponding ground states. In
+particular, we find a finite dc Hall conductivity in one phase but not the
+other. The underlying physical reasons for this are analyzed further by
+exploring relations of the dc Hall conductivity to the system's chirality and
+Berry curvatures of the Bloch bands. Finally, we discuss an experimental method
+of probing the anomalous Hall effect in trapped systems.",2211.15511v1
+2023-05-29,Stationary and moving bright solitons in Bose-Einstein condensates with spin-orbit coupling in a Zeeman field,"With the discovery of various matter wave solitons in spin-orbit-coupled
+Bose-Einstein condensates (BECs), exploring their properties has become
+increasingly significant. We mainly study stationary and moving bright solitons
+in spin-orbit-coupled spin-1 BECs with or without a Zeeman field. The bright
+solitons correspond to the plane wave (PW) and standing wave (SW) phases. With
+the assistance of single-particle energy spectrum, we obtain the existence
+domains of PW and SW solitons by analytical and numerical methods. The results
+indicate that the interaction between atoms is also a key factor determining
+the existence of solitons. In addition, we systematically discuss the stability
+domains of PW and SW solitons, and investigate the impact of different
+parameters on the stability domains. We find that PW solitons are unstable when
+the linear Zeeman effect reaches a certain threshold, and the threshold is
+determined by other parameters. The linear Zeeman effect also leads to the
+alternating distribution of stable and unstable areas of SW solitons, and makes
+SW solitons stably exist in the area with stronger ferromagnetism. Finally, we
+analyze the collision dynamics of different types of stable solitons.",2305.17950v1
+2023-09-19,Revival of superconductivity in a one-dimensional dimerized diamond lattice,"We study an s-wave superconductivity in a one-dimensional dimerized diamond
+lattice in the presence of spin-orbit coupling and Zeeman field. The considered
+diamond lattice, comprising of three sublattices per unitcell and having flat
+band, has two dimerization patterns; the intra unitcell hoppings have the same
+(opposite) dimerization pattern as the corresponding inter unitcell hoppings,
+namely, neighboring (facing) dimerization. Using the mean-field theory, we
+calculate the superconducting order parameter self-consistently and examine the
+stability of the superconducting phase against the spin-orbit coupling, and
+Zeeman splitting, dimerization, and temperature. We find that the spin-orbit
+coupling or Zeeman splitting individually has a detrimental effect on the
+superconductivity, mostly for the facing dimerization. But their mutual effect
+revives the superconductivity at charge neutrality point for the facing
+dimerization.",2309.10637v1
+2023-10-05,Manipulating Vortices with Domain Walls in Superconductor-Ferromagnet Heterostructures,"Vortices are point-like topological defects in superconductors whose motion
+dictates superconducting properties and controls device performance. In
+superconductor-ferromagnet heterostructures, vortices interact with topological
+defects in the ferromagnet such as line-like domain walls. While in previous
+heterostructure generations, vortex-domain wall interactions were mediated by
+stray fields; in new heterostructure families, more important become exchange
+fields and spin-orbit coupling. However, spin-orbit coupling's role in
+vortex-domain wall interactions remains unexplored. Here we uncover, via
+numerical simulations and Ginzburg-Landau theory, that Rashba spin-orbit
+coupling induces magnetoelectric interactions between vortices and domain walls
+that crucially depend on the wall's winding direction$-$its helicity. The
+wall's helicity controls whether vortices are pushed or dragged by N\'eel
+walls, and their gliding direction along Bloch walls. Our work capitalizes on
+interactions between topological defects from different order parameters and of
+different dimensionality to engineer enhanced functionality.",2310.06866v1
+2024-03-19,Large Rashba spin-orbit coupling in metallic SrTaO$_3$ thin films,"Epitaxial thin films of SrTaO$_3$ with thickness ($t$) smaller than 74 nm
+were successfully fabricated on an insulator
+(LaAlO$_3$)$_{0.3}$(Sr$_2$AlTaO$_6$)$_{0.7}$ substrate. Films with $t$ above
+8.6 nm showed metallic conduction. Both conductivity and a mobility showed a
+decrease with increasing $t$ above 42 nm, suggesting the instability of thick
+SrTaO$_3$ films. This instability was also supported by TEM image and XRD
+intensity. For the metallic films with $t$ below 25 nm, energy band splitting
+due to spin-orbit coupling ($\Delta$$_{so}$) and Rashba parameter
+($\alpha$$_R$) were deduced from an analysis of a magnetoresistance using
+two-dimensional weak antilocalization theory. The values of $\Delta$$_{so}$
+ranged from 26 to 120 meV, which were the largest among other metallic oxide
+films, such as SrNbO$_3$, SrIrO$_3$, and La$_{2/3}$Sr$_{1/3}$MnO$_3$ thin
+films, indicating that spin-orbit coupling in SrTaO$_3$ was the largest among
+the metallic perovskite oxides reported so far. The values of $\alpha$$_R$ for
+our SrTaO$_3$ films ranged from $8.8 \times$10$^{-13}$ to $1.7
+\times$10$^{-12}$ eV m, which were much larger than those reported for other
+metallic oxide thin films.",2403.12612v1
+2024-04-08,Many-body quantum dynamics of spin-orbit coupled Andreev states in a Zeeman field,"We provide a theoretical framework to describe the quantum many-body dynamics
+of Andreev states in Josephson junctions with spin-orbit coupling and a
+magnetic Zeeman field. In such cases, employing a doubled Nambu spinor
+description is technically advantageous but one then has to be careful to avoid
+double-counting problems. By deriving the Lindblad master equation in the
+socalled excitation picture, we show that a physically consistent many-body
+theory free from doublecounting problems follows. We apply our formalism to a
+study of dynamical parity stabilization of the Andreev sector at intermediate
+times after an initial microwave pulse, in particular addressing the combined
+effects of spin-orbit coupling and Zeeman field.",2404.05485v1
+1997-09-01,Nonlinear Magneto-Optics of Fe Monolayers from first principles: Structural dependence and spin-orbit coupling strength,"We calculate the nonlinear magneto-optical response of free-standing fcc
+(001), (110) and (111) oriented Fe monolayers. The bandstructures are
+determined from first principles using a full-potential LAPW method with the
+additional implementation of spin-orbit coupling. The variation of the
+spin-orbit coupling strength and the nonlinear magneto-optical spectra upon
+layer orientation are investigated. We find characteristic differences which
+indicate an enhanced sensitivity of nonlinear magneto-optics to surface
+orientation and variation of the in-plane lattice constants. In particular the
+crossover from onedimensional stripe structures to twodimensional films of
+(111) layers exhibits a clean signature in the nonlinear Kerr-spectra and
+demonstrates the versatility of nonlinear magneto-optics as a tool for in situ
+thin-film analysis.",9709006v1
+2008-01-08,Spin-orbital coupling effect on Josephson current through a superconductor heterojunction,"We study spin-orbital coupling effect on the Josephson current through a
+superconductor (SC) heterojunction, consisting of two s-wave superconductors
+and a two-dimensional electron gas (2DEG) layer between them. The Rashba-type
+(RSOC) and/or Dresselhaus-type (DSOC) of spin-orbital coupling are considered
+in the 2DEG region. By using the lattice Bogoliubov-de Gennes equation and the
+Keldysh formalism, we calculate the DC supercurrent flowing through the
+junction and find that the critical current $I_c$ exhibits a damped oscillation
+with both the strength of SOC and the layer length of 2DEG; especially, the
+strength ratio between RSOC and DSOC can also induce switching between the $0$
+state and the $\pi$ state of the SC/2DEG/SC junction as well. This $0$-$\pi$
+transition results from the fact that SOC in a two-dimension system can lead to
+a pseudo-magnetic effect on the flowing electrons like the effect of a
+ferromagnet, since the time reversal symmetry of the system has already been
+broken by two SC leads with different macroscopic phases.",0801.1145v1
+2009-09-29,Effect of a staggered spin-orbit coupling on the occurrence of a nematic phase in Sr$_3$Ru$_2$O$_7$,"Ultra-clean crystals of Sr$_3$Ru$_2$O$_7$ undergo a metamagnetic transition
+at low temperatures. This transition shows a strong anisotropy in the applied
+field direction with the critical field $H_c$ ranging from $\sim 5.1$T for
+$H\perp c$ to $\sim 8$T for $H\parallel c$. In addition, studies on ultra-pure
+samples revealed a bifurcation of the metamagnetic line for fields in
+$c$-direction and it is argued that a nematic phase emerges between the
+magnetization jumps. The aim of this study is to explain the field-direction
+anisotropy of these phenomena. Based on a microscopic tight-binding model, we
+introduce the metamagnetic transition by means of a van Hove singularity
+scenario. We show that the rotation of the O-octahedra around the c-axis
+expected for this material introduces a staggered spin-orbit coupling within
+the planes and naturally leads to an anisotropy of the magnetic response. We
+describe the low-temperature phase as a nematic state favored by forward
+scattering processes. The spin-orbit coupling shows an influence on both, the
+critical field $H_c$ and the occurrence of the nematic phase.",0909.5392v2
+2011-07-12,Mass-imbalanced Fermi gases with spin-orbit coupling,"We use the mean-field theory to analyze the ground-state phase diagrams of
+spin-orbit coupled mass-imbalanced Fermi gases throughout the BCS-BEC
+evolution, including both the population-balanced and -imbalanced systems. Our
+calculations show that the competition between the mass and population
+imbalance and the Rashba-type spin-orbit coupling (SOC) gives rise to very rich
+phase diagrams, involving normal, superfluid and phase separated regions. In
+addition, we find quantum phase transitions between the topologically trivial
+gapped superfluid and the nontrivial gapless superfluid phases, opening the way
+for the experimental observation of exotic phenomena with cold atom systems.",1107.2376v2
+2011-08-01,Majorana fermions emerging from magnetic nanoparticles on a superconductor without spin-orbit coupling,"There exists a variety of proposals to transform a conventional s-wave
+superconductor into a topological superconductor, supporting Majorana fermion
+mid-gap states. A necessary ingredient of these proposals is strong spin-orbit
+coupling. Here we propose an alternative system consisting of a one-dimensional
+chain of magnetic nanoparticles on a superconducting substrate. No spin-orbit
+coupling in the superconductor is needed. We calculate the topological quantum
+number of a chain of finite length, including the competing effects of disorder
+in the orientation of the magnetic moments and in the hopping energies, to
+identify the transition into the topologically nontrivial state (with Majorana
+fermions at the end points of the chain).",1108.0419v1
+2011-10-03,First-principles study of the electronic structure and magnetism of CaIrO$_3$,"I study the electronic structure and magnetism of postperovskite CaIrO$_3$
+using first-principles calculations. The density functional calculations within
+the local density approximation without the combined effect of spin-orbit
+coupling and on-site Coulomb repulsion show the system to be metallic, which is
+in disagreement with the recent experimental evidences that show CaIrO$_3$ to
+be an antiferromagnetic Mott insulator in the $J_\textrm{eff}$ = 1/2 state.
+However, when spin-orbit coupling is taken into account, the Ir $t_{2g}$ bands
+split into fully filled $J_\textrm{eff}$ = 3/2 bands and half-filled
+$J_\textrm{eff}$ = 1/2 bands. I find that spin-orbit coupling along with a
+modest on-site Coulomb repulsion opens a gap leading to a Mott insulating
+state. The ordering is antiferromagnetic along the c axis with total moments
+aligned antiparallel along the c axis and canted along the b axis.",1110.0386v2
+2012-06-25,Particle number fractionalization of a one-dimensional atomic Fermi gas with synthetic spin-orbit coupling,"We propose an experimental scheme to simulate the fractionalization of
+particle number by using a one-dimensional spin-orbit coupled ultracold
+fermionic gas. The wanted spin-orbit coupling, a kink-like potential, and a
+conjugation-symmetry-breaking mass term are properly constructed by laser-atom
+interactions, leading to an effective low-energy relativistic Dirac Hamiltonian
+with a topologically nontrivial background field. The designed system supports
+a localized soliton excitation with a fractional particle number that is
+generally irrational and experimentally tunable, providing a direct realization
+of the celebrated generalized-Su-Schrieffer-Heeger model. In addition, we
+elaborate on how to detect the induced soliton mode with the FPN in the system.",1206.5614v2
+2012-08-13,Ground state of spin-1 Bose-Einstein condensates with spin-orbit coupling in a Zeeman field,"We systematically investigate the weakly trapped spin-1 Bose-Einstein
+condensates with spin-orbit coupling in an external Zeeman field. We find that
+the mean-field ground state favors either a magnetized standing wave phase or
+plane wave phase when the strength of Zeeman field is below a critical value
+related to the strength of spin-orbit coupling. Zeeman field can induce the
+phase transition between standing wave and plane wave phases, and we determine
+the phase boundary analytically and numerically. The magnetization of these two
+phases responds to the external magnetic field in a very unique manner, the
+linear Zeeman effect magnetizes the standing wave phase along the direction of
+the magnetic field, but the quadratic one demagnetizes the plane wave phase.
+When the strength of Zeeman field surpasses the critical value, the system is
+completely polarized to a ferromagnetic state or polar state with zero
+momentum.",1208.2514v1
+2012-09-03,Thermodynamics of spin-orbit-coupled Bose-Einstein condensates,"In this paper we develop a quantum field approach to reveal the thermodynamic
+properties of the trapped BEC with the equal Rashba and Dresselhaus spin-orbit
+couplings. In the experimentally-feasible regime, the phase transition from the
+separate phase to the single minimum phase can be well driven by the tunable
+temperature. Moreover, the critical temperature, which is independent of the
+trapped potential, can be derived exactly. At the critical point, the specific
+heat has a large jump and can be thus regarded as a promising candidate to
+detect this temperature-driven phase transition. In addition, we obtain the
+analytical expressions for the specific heat and the entropy in the different
+phases. In the single minimum phase, the specific heat as well as the entropy
+are governed only by the Rabi frequency. However, in the separate phase with
+lower temperature, we find that they are determined only by the strength of
+spin-orbit coupling. Finally, the effect of the effective atom interaction is
+also addressed. In the separate phase, this effective atom interaction affects
+dramatically on the critical temperature and the corresponding thermodynamic
+properties.",1209.0346v1
+2012-09-19,Nodeless superconductivity in Ir$_{1-x}$Pt$_x$Te$_2$ with strong spin-orbital coupling,"The thermal conductivity $\kappa$ of superconductor Ir$_{1-x}$Pt$_{x}$Te$_2$
+($x$ = 0.05) single crystal with strong spin-orbital coupling was measured down
+to 50 mK. The residual linear term $\kappa_0/T$ is negligible in zero magnetic
+field. In low magnetic field, $\kappa_0/T$ shows a slow field dependence. These
+results demonstrate that the superconducting gap of Ir$_{1-x}$Pt$_{x}$Te$_2$ is
+nodeless, and the pairing symmetry is likely conventional s-wave, despite the
+existence of strong spin-orbital coupling and a quantum critical point.",1209.4229v3
+2013-04-16,Spin-orbit Coupling Effects on the Superfluidity of Fermi Gas in an Optical Lattice,"We investigate the superfluidity of attractive Fermi gas in a square optical
+lattice with spin-orbit coupling (SOC). We show that the system displays a
+variety of new filling-dependent features. At half filling, a quantum phase
+transition from a semimetal to a superfluid is found for large SOC. Close to
+half filling where the emerging Dirac cones governs the behaviors of the
+system, SOC tends to suppress the BCS superfluidity. Conversely, SOC can
+significantly enhance both the pairing gap and condensate fraction and lead to
+a new BCS-BEC crossover for small fillings. Moreover, we demonstrate that the
+superfluid fraction also exhibits many interesting phenomena compared with the
+spin-orbit coupled Fermi gas without lattice.",1304.4511v2
+2013-06-25,Inhomogeneous Topological Superfluidity in One-Dimensional Spin-Orbit-Coupled Fermi Gases,"We theoretically predict an exotic topological superfluid state with
+spatially modulated pairing gap in one-dimensional spin-orbit-coupled Fermi
+gases. This inhomogeneous topological superfluidity is induced by applying
+simultaneously a perpendicular Zeeman magnetic field and an equally weighted
+Rashba and Dresselhaus spin-orbit coupling in one-dimensional optical lattices.
+Based on the self-consistent Bogoliubov--de Gennes theory, we confirm that this
+novel topological phase is a unique condensation of Cooper pairs, which
+manifests the interplay between the inhomogeneity of superfluid and its
+nontrivial topological structure. The properties of the emergent Majorana bound
+states are investigated in detail by examining the associated $\mathbb{Z}_{2}$
+topological number, the eigenenergy and density of states spectra, as well as
+the wave functions of the localized Majorana end modes. Experimental
+feasibility of observing this new topological state of matter is also
+discussed.",1306.5934v2
+2013-07-14,Topological Fulde-Ferrell superfluid in spin-orbit coupled atomic Fermi gases,"We theoretically predict a new topological matter - topological inhomogeneous
+Fulde-Ferrell superfluid - in one-dimensional atomic Fermi gases with equal
+Rashba and Dresselhaus spin-orbit coupling near s-wave Feshbach resonances. The
+realization of such a spin-orbit coupled Fermi system has already been
+demonstrated recently by using a two-photon Raman process and the extra
+one-dimensional confinement is easy to achieve using a tight two-dimensional
+optical lattice. The topological Fulde-Ferrell superfluid phase is
+characterized by a nonzero center-of-mass momentum and a non-trivial Berry
+phase. By tuning the Rabi frequency and the detuning of Raman laser beams, we
+show that such an exotic topological phase occupies a significant part of
+parameter space and therefore it could be easily observed experimentally, by
+using, for example, momentum-resolved and spatially resolved radio-frequency
+spectroscopy.",1307.3744v2
+2013-10-16,Engineering the Quantum Anomalous Hall Effect in Graphene with Uniaxial Strains,"We theoretically investigate the manipulation of the quantum anomalous Hall
+effect (QAHE) in graphene by means of the uniaxial strain. The values of Chern
+number and Hall conductance demonstrate that the strained graphene in presence
+of Rashba spin-orbit coupling and exchange field, for vanishing intrinsic
+spin-orbit coupling, possesses non-trivial topological phase which is robust
+against the direction and modulus of the strain. Besides, we also find that the
+interplay between Rashba and intrinsic spin-orbit couplings results in a
+topological phase transition in the strained graphene. Remarkably, as the
+strain strength is increased beyond approximately 7%, the critical parameters
+of the exchange field for triggering the quantum anomalous Hall phase
+transition show distinct behaviors - decrease (increase) for strains along
+zigzag (armchair) direction. Our findings open up a new platform for
+manipulation of the QAHE by an experimentally accessible strain deformation of
+the graphene structure, with promising application on novel quantum electronic
+devices with high energy efficiency performance.",1310.4468v2
+2014-02-09,Study on the tunneling spectroscopy of $N-pS$ junction and $N-hS$ junction,"We study the complete tunneling spectroscopy of a normal metal/$p$-wave
+superconductor junction ($N-pS$) and normal metal/heterostructure
+superconductor junction ($N-hS$) by Blonder-Tinkham-Klapwijk (BTK) method. We
+find that, for $p$-wave superconductor with non-trivial topology, there exists
+a quantized zero-bias conductance peak stably, for heterostructure
+superconductor with non-trivial topology, the emerging zero-bias conductance
+peak is non-quantized and usually has a considerable gap to the quantized
+value. Furthermore, it is sensitive to parameters, especially to spin-orbit
+coupling and the $s$-wave pairing potential. Results obtained suggest that the
+observation of a small zero-bias conductance peak, instead of a quantized
+zero-bias conductance peak, in current tunneling experiments can be a natural
+result if the spin-orbit coupling turns out to be several times smaller than
+the reported one. Results obtained also suggest that both a stronger spin-orbit
+coupling and proximity $s$-wave superconductor with relative weaker pairing
+potential can produce a much more striking zero-bias conductance peak (compared
+to the experiments), even an almost quantized one. As $s$-wave superconductors
+are common in nature, the prediction can be verified within current experiment
+ability.",1402.1964v1
+2014-02-27,Gapless topological Fulde-Ferrell superfluidity in spin-orbit coupled Fermi gases,"Topological superfluids usually refer to a superfluid state which is gapped
+in the bulk but metallic at the boundary. Here we report that a gapless,
+topologically non-trivial superfluid with inhomogeneous Fulde-Ferrell pairing
+order parameter can emerge in a two-dimensional spin-orbit coupled Fermi gas,
+in the presence of both in-plane and out-of-plane Zeeman fields. The
+Fulde-Ferrell pairing - induced by the spin-orbit coupling and in-plane Zeeman
+field - is responsible for this gapless feature. This exotic superfluid has a
+significant Berezinskii-Kosterlitz-Thouless (BKT) transition temperature and
+has robust Majorana edge modes against disorder owing to its topological
+nature.",1402.6832v2
+2014-02-28,Anisotropic optical properties of Fe/GaAs(001) nanolayers from first principles,"We investigate the anisotropy of the optical properties of thin Fe films on
+GaAs(001) from first-principles calculations. Both intrinsic and
+magnetization-induced anisotropy are covered by studying the system in the
+presence of spin-orbit coupling and external magnetic fields. We use the
+linearized augmented plane wave method, as implemented in the WIEN2k density
+functional theory code, to show that the $C_{2v}$ symmetric anisotropy of the
+spin-orbit coupling fields at the Fe/GaAs(001) interface manifests itself in
+the corresponding anisotropy of the optical conductivity and the polar
+magneto-optical Kerr effect. While their magnetization-induced anisotropy is
+negligible, the intrinsic anisotropy of the optical properties is significant
+and reflects the underlying $C_{2v}$ symmetry of the Fe/GaAs(001) interface.
+This suggests that the effects of anisotropic spin-orbit coupling fields in
+experimentally relevant Fe/GaAs(001) slabs can be studied by purely optical
+means.",1402.7370v1
+2014-09-01,Tight-binding theory of spin-orbit coupling in graphynes,"We investigate the effects of Rashba and intrinsic spin-orbit couplings in
+graphynes. First, we develop a general method to address spin-orbit couplings
+within the tight-binding theory. Then, we apply this method to $\alpha$,
+$\beta$, and $\gamma$-graphyne, and determine the SOC parameters in terms of
+the microscopic hopping and on-site energies. We find that for
+$\alpha$-graphyne, as in graphene, the intrinsic SOC opens a non-trivial gap,
+whereas the Rashba SOC splits each Dirac cone into four. In $\beta$ and
+$\gamma$ graphyne, the Rashba SOC can lead to a Lifshitz phase transition, thus
+transforming the zero-gap semiconductor into a gapped system or vice versa,
+when pairs of Dirac cones annihilate or emerge. The existence of internal
+(within the benzene ring) and external SOC in these compounds allow us to
+explore a myriad of phases not available in graphene.",1409.0388v2
+2015-01-28,Discrete solitons of spin-orbit coupled Bose-Einstein condensates in optical lattices,"We study localized nonlinear excitations of a dilute Bose-Einstein condensate
+(BEC) with spin-orbit coupling in a deep optical lattice (OL). We use Wannier
+functions to derive a tight-binding model that includes the spin-orbit coupling
+(SOC) at the discrete level in the form of a generalized discrete nonlinear
+Sch\""odinger equation. Spectral properties are investigated and the existence
+and stability of discrete solitons and breathers with different symmetry
+properties with respect to the OL is demonstrated. We show that the symmetry of
+the modes can be changed from on-site to inter-site and to asymmetric modes
+simply by changing the interspecies interaction. Asymmetric modes appear to be
+novel modes intrinsic of the SOC.",1501.07296v1
+2015-04-24,Bright solitons in a 2D spin-orbit-coupled dipolar Bose-Einstein condensate,"We study a two-dimensional spin-orbit-coupled dipolar Bose-Einstein
+condensate with repulsive contact interactions by both the variational method
+and the imaginary time evolution of the Gross-Pitaevskii equation. The dipoles
+are completely polarized along one direction in the 2D plane so as to provide
+an effective attractive dipole-dipole interaction. We find two types of
+solitons as the ground states arising from such attractive interactions: a
+plane wave soliton with a spatially varying phase and a stripe soliton with a
+spatially oscillating density for each component. Both types of solitons
+possess smaller size and higher anisotropy than the soliton without spin-orbit
+coupling. Finally, we discuss the properties of moving solitons, which are
+nontrivial because of the violation of Galilean invariance.",1504.06575v2
+2015-06-11,Simulating Chiral Magnetic and Separation Effects with Spin-Orbit Coupled Atomic Gases,"The chiral magnetic and chiral separation effects---quantum-anomaly-induced
+electric current and chiral current along an external magnetic field in
+parity-odd quark-gluon plasma---have received intense studies in the community
+of heavy-ion collision physics. We show that analogous effects occur in
+rotating trapped Fermi gases with Weyl-Zeeman spin-orbit coupling where the
+rotation plays the role of an external magnetic field. These effects can induce
+a mass quadrupole in the atomic cloud along the rotation axis which may be
+tested in future experiments. Our results suggest that the spin-orbit coupled
+atomic gases are potential simulators of the chiral magnetic and separation
+effects.",1506.03590v2
+2016-01-06,Influence of structural distortions on the Ir magnetism in Ba2-xSrxYIrO6 double perovskites,"We explore the relative strengths of spin orbit coupling and crystal field
+splitting in the Ir5+ compounds Ba2-xSrxYIrO6. In the case of strong spin orbit
+coupling and regular Ir5+ octahedra, one expects a nonmagnetic J = 0 state; in
+the case of distorted octahedra where crystal field effects dominate, the t2g
+manifold splits into a magnetic ground state. We report the results of
+continuously transitioning from the cubic Ba2YIrO6 double perovskite with ideal
+octahedra to the monoclinic Sr2YIrO6 double perovskite with distorted
+octahedra. We see no emergence of an enhanced Ir5+ magnetic moment in the
+series on increasing the structural distortions, as would have been the case
+for significant crystal field splitting. The near-constant magnetic moment
+observed through the Ba2-xSrxYIrO6 series reinforces the notion that spin-orbit
+coupling is the dominant force in determining the magnetism of iridium-oxygen
+octahedra in perovskite-like structures",1601.01198v1
+2019-05-31,Orbital Magnetic Field Effects in Mott Insulators with Strong Spin-Orbit Coupling,"We study the effect of a magnetic field on the low energy description of Mott
+insulators with strong spin-orbit (SO) coupling. In contrast to the standard
+case of the Hubbard model without SO coupling, we show that Peierls phases can
+modulate the magnetic exchange at leading order in the interaction. Our
+mechanism crucially depends on the existence of distinct exchange paths between
+neighboring magnetic ions enclosing a well-defined area. Thus it will
+generically be present in any solid state realisation of the Kitaev model and
+its extensions. We explicitly calculate the variation of the exchange constants
+of the so-called $JK\Gamma$ model as a function of the magnetic flux. We
+discuss experimental implications of our findings for various settings of
+candidate Kitaev spin liquids.",1905.13683v3
+2010-05-20,"Comment on ""On the classical analysis of spin-orbit coupling in hydrogenlike atoms,"" [Am. J. Phys. 78 (4) 428-432, April 2010]","In their recent paper, Kholmetskii, Missevitch, and Yarman ""reanalyze the
+usual classical derivation of spin-orbit coupling in hydrogenlike atoms"" and
+find a result ""in qualitative agreement with the solution of the Dirac-Coulomb
+equation for hydrogenlike atoms."" However, the authors' result is based on an
+equation of translational motion of the electron that omits any contribution
+due to the existence of ""hidden"" momentum of the electron intrinsic magnetic
+dipole moment in the electric field of the nucleus. Accounting for hidden
+momentum is necessary to obtaining conservation of linear momentum in the
+interaction of a magnetic dipole with a point charge. If hidden momentum is
+omitted from the description, the force on the nucleus due to the electron will
+differ from the force on the electron due to the nucleus. Thus, omitting the
+hidden momentum contribution, the binding energy including the spin-orbit
+coupling cannot be consistently calculated, while including hidden momentum,
+the value obtained is in disagreement with experiment.",1005.3841v2
+2013-08-21,Effective Hamiltonians for quasi-one-dimensional Fermi gases with spin-orbit coupling,"We derive one-dimensional effective Hamiltonians for spin-orbit coupled Fermi
+gases confined in quasi-one-dimensional trapping potentials. For energy regime
+around the two-body bound state energy, the effective Hamiltonian takes a
+two-channel form, where the population in transverse excited levels are
+described by dressed molecules in the closed channel. For energy regime
+slightly above the continuum threshold, the effective Hamiltonian takes a
+single-channel form, where low-energy physics is governed by the
+one-dimensional interacting strength determined by three-dimensional scattering
+length and transverse confinement. We further discuss the effect of spin-orbit
+coupling and effective Zeeman field on the position of confinement-induced
+resonances, and show that these resonances can be understood as Feshbach
+resonances between the threshold of the transverse ground state and the
+two-body bound state associated with the transverse excited states. We expect
+that the shift of confinement-induced resonances can be observed under present
+experimental technology at attainable temperatures.",1308.4511v1
+2012-01-10,Full counting statistics for orbital-degenerate impurity Anderson model with Hund's rule exchange coupling,"We study non-equilibrium current fluctuations through a quantum dot, which
+includes a ferromagnetic Hund's rule coupling $J$, in the low-energy Fermi
+liquid regime using the renormalized perturbation theory. The resulting
+cumulant for the current distribution in the particle-hole symmetric case,
+shows that spin-triplet and spin-singlet pairs of quasiparticles are formed in
+the current due to the Hund's rule coupling and these pairs enhance the current
+fluctuations. In the fully screened higher-spin Kondo limit, the Fano factor
+takes a value $F_b = (9M+6)/ (5M+4)$ determined by the orbital degeneracy $M$.
+We also investigate crossover between the small and large $J$ limits in the
+two-orbital case M=2, using the numerical renormalization group approach.",1201.1957v2
+2012-04-11,Shiba impurity bound states as a probe of topological superconductivity and Fermion parity changing quantum phase transitions,"Spin-orbit coupled superconductors are potentially interesting candidates for
+realizing topological and potentially non-Abelian states with Majorana
+Fermions. We argue that time-reversal broken spin-orbit coupled superconductors
+generically can be characterized as having sub-gap states that are bound to
+localized non-magnetic impurities. Such bound states, which are referred to as
+Shiba states, can be detected as sharp resonances in the tunneling spectrum of
+the spin-orbit coupled superconductors. The Shiba state resonance can be tuned
+using a gate-voltage or a magnetic field from being at the edge of the gap at
+zero magnetic fields to crossing zero energy when the Zeeman splitting is tuned
+into the topological superconducting regime. The zero-crossing signifies a
+Fermion parity changing first order quantum phase transition, which is
+characterized by a Pfaffian topological invariant.
+  These zero-crossings of the impurity level can be used to locally
+characterize the topological superconducting state from tunneling experiments.",1204.2537v2
+2014-06-20,Zeeman field induced non-trivial topology in a spin-orbit coupled superconductor,"The hope to realize Majorana fermions at the vortex core of a two dimensional
+topological superconductor has led to a variety of proposals for devices which
+exhibit topological superconductivity. Many of these include superconductivity
+through the proximity effect and therefore require a layer of a conventional
+superconductor deposited on top of another system, which lends its topological
+properties\cite{Fu,Sau,Alicea}. The necessity of the superconducting layer
+poses some technical complications and, in particular, makes it harder to probe
+the Majorana state. In this work we propose to replace the proximity effect
+pairing by an innate tendency for pairing, mediated by interactions. We use a
+model system with spin orbit coupling and on-site repulsion and apply
+renormalization group to the interaction vertex. Without a Zeeman field this
+model exhibits pairing instabilities in different channels depending on the
+tuning of parameters. Once a Zeeman field is introduced the model favors
+topological superconductivity where the order parameter winds an odd number of
+times around the Fermi surface. This suggests that certain superconductors,
+with strong spin-orbit coupling, may go through a topological phase transition
+as a function of applied magnetic field.",1406.5552v1
+2015-12-06,Absence of Localization in Disordered Two Dimensional Electron Gas at Weak Magnetic Field and Strong Spin-Orbit Coupling,"The one-parameter scaling theory of localization predicts that all states in
+a disordered two-dimensional system with broken time reversal symmetry are
+localized even in the presence of strong spin-orbit coupling. While at constant
+strong magnetic fields this paradigm fails (recall quantum Hall effect), it is
+believed to hold at weak magnetic fields. Here we explore the nature of quantum
+states at weak magnetic field and strongly fluctuating spin-orbit coupling,
+employing highly accurate numerical procedure based on level spacing
+distribution and transfer matrix technique combined with finite-size
+one-parameter scaling hypothesis. Remarkably, the metallic phase, (known to
+exist at zero magnetic field), persists also at finite (albeit weak) magnetic
+fields, and eventually crosses over into a critical phase, which has already
+been confirmed at high magnetic fields. A schematic phase diagram drawn in the
+energy-magnetic field plane elucidates the occurrence of localized, metallic
+and critical phases. In addition, it is shown that nearest-level statistics is
+determined solely by the symmetry parameter $\beta$ and follows the Wigner
+surmise irrespective of whether states are metallic or critical.",1512.01733v1
+2015-12-13,Zitterbewegung with spin-orbit coupled ultracold atoms in a fluctuating optical lattice,"Dynamics of non-interacting ultracold atoms with artificial spin-orbit
+coupling is considered. Spin-orbit coupling is created using two moving optical
+lattices with orthogonal polarizations. Our main goal is to study influence of
+lattice noise on Rabi oscillations. Special attention is paid to the phenomenon
+of the Zitterbewegung being trembling motion caused by Rabi transitions between
+states with different velocities. Phase and amplitude fluctuations of lattices
+are modelled by means of the two-dimensional stochastic Ornstein-Uhlenbeck
+process, also known as harmonic noise. In the the noiseless case the problem is
+solved analytically in terms of the momentum representation. It is shown that
+lattice noise significantly extends duration of the Zitterbewegung as compared
+to the noiseless case. This effect originates from noise-induced decoherence of
+Rabi oscillations.",1512.04007v2
+2016-05-13,"Topological nodal-line semimetals in alkaline-earth stannides, germanides and silicides","Based on first-principles calculations and an effective Hamiltonian analysis,
+we systematically investigate the electronic and topological properties of
+alkaline-earth compounds $AX_2$ ($A$=Ca, Sr, Ba; $X$=Si, Ge, Sn). Taking
+BaSn$_2$ as an example, we find that when spin-orbit coupling is ignored, these
+materials are three-dimensional topological nodal-line semimetals characterized
+by a snake-like nodal loop in three-dimensional momentum space. Drumhead-like
+surface states emerge either inside or outside the loop circle on the (001)
+surface depending on surface termination, while complicated
+double-drumhead-like surface states appear on the (010) surface. When
+spin-orbit coupling is included, the nodal line is gapped and the system
+becomes a topological insulator with Z$_2$ topological invariants (1;001).
+Since spin-orbit coupling effects are weak in light elements, the nodal-line
+semimetal phase is expected to be achievable in some alkaline-earth germanides
+and silicides.",1605.04050v2
+2016-12-13,Negative mass hydrodynamics in a Spin-Orbit--Coupled Bose-Einstein Condensate,"A negative effective mass can be realized in quantum systems by engineering
+the dispersion relation. A powerful method is provided by spin-orbit coupling,
+which is currently at the center of intense research efforts. Here we measure
+an expanding spin-orbit coupled Bose-Einstein condensate whose dispersion
+features a region of negative effective mass. We observe a range of dynamical
+phenomena, including the breaking of parity and of Galilean covariance,
+dynamical instabilities, and self-trapping. The experimental findings are
+reproduced by a single-band Gross-Pitaevskii simulation, demonstrating that the
+emerging features - shockwaves, soliton trains, self-trapping, etc. - originate
+from a modified dispersion. Our work also sheds new light on related phenomena
+in optical lattices, where the underlying periodic structure often complicates
+their interpretation.",1612.04055v2
+2017-10-08,$SU(3)$ Topological Insulators in the Honeycomb Lattice,"We investigate realizations of topological insulators with spin-1 bosons
+loaded in a honeycomb optical lattice and subjected to a $SU(3)$ spin-orbit
+coupling - a situation which can be realized experimentally using cold atomic
+gases. In this paper, we focus on the topological properties of the
+single-particle band structure, namely Chern numbers (lattice with periodic
+boundary conditions) and edge states (lattice with strip geometry). While
+$SU(2)$ spin-orbit couplings always lead to time-reversal symmetric Hubbard
+models, and thereby to topologically trivial band structures, suitable $SU(3)$
+spin-orbit couplings can break time reversal symmetry and lead to topologically
+non-trivial bulk band structures and to edge states in the strip geometry. In
+addition, we show that one can trigger a series of topological transitions
+(i.e. integer changes of the Chern numbers) that are specific to the geometry
+of the honeycomb lattice by varying a single parameter in the Hamiltonian.",1710.02788v2
+2018-06-07,Bloch bound state of spin-orbit-coupled fermions in an optical lattice,"Understanding fundamentals of few-body physics provides an interesting
+bottom-up approach for the clarification of many-body properties. The
+remarkable experimental progress in realizing spin-orbit coupling (SOC) in
+optical Raman lattices offers a renewed thrust towards discovering novel
+few-body features induced by the interplay between SOC and optical lattices.
+Using the Wilson renormalization method to account for high-band effects, we
+study the low-energy two-body scattering processes of spin-$1/2$ fermions in
+spin-orbit coupled optical lattices. We demonstrate that, under weak SOC,
+adding a small lattice potential would destabilize shallow two-body bound
+states, contrary to conventional wisdom. On the other hand, when lattice is
+sufficiently deep, two-body bound states are always stabilized by increasing
+the lattice depth. This intriguing non-monotonic behavior of the bound-state
+stability derives from the competition between SOC and optical lattices, and
+can be explained by analyzing the low-energy density of states. We also discuss
+the impact of high-band effects on such a behavior, as well as potential
+experimental detections.",1806.02478v2
+2018-12-20,Nonlinear dynamics of a spin-orbit-coupled Bose-Einstein condensate,"Single-particle dynamics of a spin-orbit-coupled Bose-Einstein condensate has
+recently been investigated in experiments that explore the physics of
+Landau-Zener tunneling and of the Zitterbewegung. In this paper, we study the
+influence of a nonlinearity due to interactions on these dynamics and show that
+the dispersion relation develops interesting loop strucures. The atoms can move
+along the nonlinear dispersion curve in the presence of a weak acceleration
+force and we show that the loops lead to straightforward nonlinear Landau-Zener
+tunneling. However, we find that for the Zitterbewegung, induced by a sudden
+quench in the spin-orbit coupling parameters, the nonlinear dispersion is
+irrelevant.",1812.08303v2
+2019-02-22,Roton-induced Bose polaron in the presence of synthetic spin-orbit coupling,"We theoretically investigate the quasiparticle (polaron) properties of an
+impurity immersing in a Bose-Einstein condensate with equal Rashba and
+Dresselhaus spin-orbit coupling at zero temperature. In the presence of
+spin-orbit coupling, all bosons can condense into a single plane-wave state
+with finite momentum, and the corresponding excitation spectrum shows an
+intriguing roton minimum. We find that the polaron properties are strongly
+modified by this roton minimum, where the ground state of attractive polaron
+acquires a nonzero momentum and anisotropic effective mass. Across the
+resonance of the interaction between impurity and atoms, the polaron evolves
+into a tight-binding dimer. We show that the evolution is not smooth when the
+roton structure of the condensate becomes apparent, and a first-order phase
+transition from a phonon-induced polaron to a roton-induced polaron is observed
+at a critical interaction strength.",1902.08333v1
+2019-11-09,Interplay of Coulomb repulsion and spin-orbit coupling in superconducting 3D quadratic band touching Luttinger semimetals,"We investigate the superconductivity of 3D Luttinger semimetals, such as
+YPtBi, where Cooper pairs are constituted of spin-3/2 quasiparticles. Various
+pairing mechanisms have already been considered for these semimetals, such as
+from polar phonons modes, and in this work we explore pairing from the screened
+electron-electron Coulomb repulsion. In these materials, the small Fermi energy
+and the spin-orbit coupling strongly influence how charge fluctuations can
+mediate pairing. We find the superconducting critical temperature as a function
+of doping for an s-wave order parameter, and determine its sensitivity to
+changes in the dielectric permittivity. Also, we discuss how order parameters
+other than s-wave may lead to a larger critical temperature, due to spin-orbit
+coupling.",1911.03712v1
+2020-06-08,Pressure Induced Topological Superconductivity in the Spin-Orbit Mott Insulator GaTa4Se8,"Lacunar spinel GaTa$_4$Se$_8$ is a unique example of spin-orbit coupled Mott
+insulator described by molecular $j_{\text{eff}}\!=\!3/2$ states. It becomes
+superconducting at T$_c$=5.8K under pressure without doping. In this work, we
+show, this pressure-induced superconductivity is a realization of a new type
+topological phase characterized by spin-2 Cooper pairs. Starting from
+first-principles density functional calculations and random phase
+approximation, we construct the microscopic model and perform the detailed
+analysis. Applying pressure is found to trigger the virtual interband tunneling
+processes assisted by strong Hund coupling, thereby stabilizing a particular
+$d$-wave quintet channel. Furthermore, we show that its Bogoliubov
+quasiparticles and their surface states exhibit novel topological nature. To
+verify our theory, we propose unique experimental signatures that can be
+measured by Josephson junction transport and scanning tunneling microscope. Our
+findings open up new directions searching for exotic superconductivity in
+spin-orbit coupled materials.",2006.04782v1
+2020-06-21,Spin-orbit coupled spin-1 Bose-Einstein condensate flow past an obstacle in the presence of a Zeeman field,"We study the dynamics of a Rashba spin-orbit coupled spin-1 ferromagnetic
+Bose-Einstein condensate under a linear Zeeman magnetic field(ZF) disturbed by
+a moving obstacle. The Bogoliubov excitation spectrums and corresponding
+critical excitations in different situations are analyzed. The structure of the
+coreless vortex or antivortex generated by the moving obstacle has been
+investigated. When the ZF is applied along x direction, the vortex cores for
+the three components of a(an) vortex(antivortex) could be arranged into a
+vertical line, and their order would be reversed as the spin-orbit coupling
+increases. When the ZF is parallel to z direction, a skyrmion-like vortex
+ground state could be induced even by a static obstacle. This topological
+structure is also found to be dynamically stable if the obstacle is moving at a
+relatively small velocity.",2006.11832v1
+2020-11-29,Dynamical generation of solitons in one-dimensional Fermi superfluids with and without spin-orbit coupling,"We theoretically generalize a systematic language to describe the
+phase-imprinting technique to investigate the dynamical generation of solitons
+in a one-dimensional Raman-type spin-orbit-coupled Fermi superfluid. We check
+our method with the simulation of time-dependent Bogoliubov-de Gennes equations
+and find that our method not only can generate stable dark and even gray
+solitons in a conventional Fermi superfluid by controlling the transferred
+phase jump but also is feasible to create a stable dark soliton in both BCS and
+topological states of a spin-orbit-coupled Fermi superfluid. We also discuss
+the physical implication of our method.",2011.14245v3
+2021-03-13,Nonlinear dynamics of topological Dirac fermions in 2D spin-orbit coupled materials,"The graphene family materials are two-dimensional staggered monolayers with a
+gapped energy band structure due to intrinsic spin-orbit coupling. The mass
+gaps in these materials can be manipulated on-demand via biasing with a static
+electric field, an off-resonance circularly polarized laser, or an exchange
+interaction field, allowing the monolayer to be driven through a multitude of
+topological phase transitions. We investigate the dynamics of spin-orbit
+coupled graphene family materials to unveil topological phase transition
+fingerprints embedded in the nonlinear regime and show how these signatures
+manifest in the nonlinear Kerr effect and in third-harmonic generation
+processes. We show that the resonant nonlinear spectral response of topological
+fermions can be traced to specific Dirac cones in these materials, enabling
+characterization of topological invariants in any phase by detecting the
+cross-polarized component of the electromagnetic field. By shedding light on
+the unique processes involved in harmonic generation via topological phenomena
+our findings open an encouraging path towards the development of novel
+nonlinear systems based on two-dimensional semiconductors of the graphene
+family.",2103.07632v2
+2021-03-14,Topological Mott transition in a two band model of spinless fermions with on-site Coulomb repulsion,"In the framework of mean field approach, we study topological Mott transition
+in a two band model of spinless fermions on a square lattice at half filling.
+We consider the combined effect of the on-site Coulomb repulsion and the
+spin-orbit Rashba coupling. The ground state phase diagram is calculated as a
+function of the strength of the spin-orbit Rashba coupling and the Coulomb
+repulsion. The spin-orbit Rashba coupling leads to a distinct phase of matter,
+the topological semimetal. We study a new type of phase transition between the
+non-topological insulator and topological semimetal states. Topological phase
+state is characterized by the zero energy Majorana states, which there are in
+defined region of the wave vectors and are localized at the boundaries of the
+sample. The region of existence of the zero energy Majorana states tends to
+zero at the point of the Mott phase transition. The zero energy Majorana states
+are dispersionless (they can be considered as flat bands), the Chern number and
+Hall conductance are equal to zero (note in two dimensional model",2103.07916v2
+2022-03-06,Probing two Higgs oscillations in a one-dimensional Fermi superfluid with Raman-type spin-orbit coupling,"We theoretically investigate the Higgs oscillation in a one-dimensional
+Raman-type spin-orbit-coupled Fermi superfluid with the time-dependent
+Bogoliubov-de Gennes equations. By linearly ramping or abruptly changing the
+effective Zeeman field in both the Bardeen-Cooper-Schrieffer state and the
+topological superfluid state, we find the amplitude of the order parameter
+exhibits an oscillating behaviour over time with two different frequencies
+(i.e., two Higgs oscillations) in contrast to the single one in a conventional
+Fermi superfluid. The observed period of oscillations has a great agreement
+with the one calculated using the previous prediction [Volkov and Kogan, J.
+Exp. Theor. Phys. 38, 1018 (1974)], where the oscillating periods are now
+determined by the minimums of two quasi-particle spectrum in this system. We
+further verify the existence of two Higgs oscillations using a periodic ramp
+strategy with theoretically calculated driving frequency. Our predictions would
+be useful for further theoretical and experimental studies of these Higgs
+oscillations in spin-orbit-coupled systems.",2203.02919v1
+2022-03-21,Hydrodynamic spin-orbit coupling in asynchronous optically driven micro-rotors,"Vortical flows of rotating particles describe interactions ranging from
+molecular machines to atmospheric dynamics. Yet to date, direct observation of
+the hydrodynamic coupling between artificial micro-rotors has been restricted
+by the details of the chosen drive, either through synchronization (using
+external magnetic fields) or confinement (using optical tweezers). Here we
+present a new active system that illuminates the interplay of rotation and
+translation in free rotors. We developed a non-tweezing circularly polarized
+beam that simultaneously rotates hundreds of silica-coated birefringent
+colloids. The particles rotate asynchronously in the optical torque field while
+freely diffusing in the plane. We observe that neighboring particles orbit each
+other with an angular velocity that depends on their spins. We derive an
+analytical model in the Stokes limit for pairs of spheres that quantitatively
+explains the observed dynamics. We then find that the geometrical nature of the
+low Reynolds fluid results in a universal hydrodynamic spin-orbit coupling. Our
+findings are of significance for the understanding and development of
+far-from-equilibrium materials.",2203.11051v2
+2023-03-15,The Dynamical Stripes in Spin-Orbit Coupled Bose-Einstein Condensates with Josephson Junctions,"The Josephson dynamics of the Bose-Einstein condensation with Raman-induced
+spin-orbit coupling is investigated. A quasi-1D trap is divided into two
+reservoirs by an optical barrier. Before the tunneling between the reservoirs
+is turned on, the system stays in its equilibrium ground state. For different
+spin-orbit coupling parameters and interaction strengthes, the ground state
+displays a rich phase diagram. In this work we focus on the plane wave phase
+and the stripe phase. Our calculation shows that, when the tunneling is turned
+on, the plane wave phase evolves into a dynamical stripe phase, that is, the
+density of the particle changes from uniform to periodically modulated.
+Basically, this stripe is described by a sine function and the wave length, the
+amplitude and the initial phase of the function are all varying with time. If
+the system stays in stripe phase initially, the stripes become ``sliding"" when
+the tunneling is turned on, which reflects the running of one of the phases of
+the wave function.",2303.08585v1
+2021-03-11,Tunable spin-valley coupling in layered polar Dirac metals,"In non-centrosymmetric metals, spin-orbit coupling (SOC) induces
+momentum-dependent spin polarization at the Fermi surfaces. This is exemplified
+by the valley-contrasting spin polarization in monolayer transition metal
+dichalcogenides (TMDCs) with in-plane inversion asymmetry. However, the valley
+configuration of massive Dirac fermions in TMDCs is fixed by the graphene-like
+structure, which limits the variety of spin-valley coupling. Here, we show that
+the layered polar metal BaMn$X_2$ ($X =$Bi, Sb) hosts tunable
+spin-valley-coupled Dirac fermions, which originate from the distorted $X$
+square net with in-plane lattice polarization. We found that in spite of the
+larger SOC, BaMnBi$_2$ has approximately one-tenth the lattice distortion of
+BaMnSb$_2$, from which a different configuration of spin-polarized Dirac
+valleys is theoretically predicted. This was experimentally observed as a clear
+difference in the Shubnikov-de Haas oscillation at high fields between the two
+materials. The chemically tunable spin-valley coupling in BaMn$X_2$ makes it a
+promising material for various spin-valleytronic devices.",2103.06765v2
+2023-10-19,Coherence of a field-gradient-driven singlet-triplet qubit coupled to many-electron spin states in 28Si/SiGe,"Engineered spin-electric coupling enables spin qubits in semiconductor
+nanostructures to be manipulated efficiently and addressed individually. While
+synthetic spin-orbit coupling using a micromagnet is widely used for driving
+qubits based on single spins in silicon, corresponding demonstration for
+encoded spin qubits is so far limited to natural silicon. Here, we demonstrate
+fast singlet-triplet qubit oscillation (~100 MHz) in a gate-defined double
+quantum dot in $^{28}$Si/SiGe with an on-chip micromagnet with which we show
+the oscillation quality factor of an encoded spin qubit exceeding 580. The
+coherence time $\textit{T}_{2}$* is analyzed as a function of potential
+detuning and an external magnetic field. In weak magnetic fields, the coherence
+is limited by fast noise compared to the data acquisition time, which limits
+$\textit{T}_{2}$* < 1 ${\mu}$s in the ergodic limit. We present evidence of
+sizable and coherent coupling of the qubit with the spin states of a nearby
+quantum dot, demonstrating that appropriate spin-electric coupling may enable a
+charge-based two-qubit gate in a (1,1) charge configuration.",2310.12603v2
+2018-12-26,Soliton lattices in the Gross-Pitaevskii equation with nonlocal and repulsive coupling,"Spatially-periodic patterns are studied in nonlocally coupled
+Gross-Pitaevskii equation. We show first that spatially periodic patterns
+appear in a model with the dipole-dipole interaction. Next, we study a model
+with a finite-range coupling, and show that a repulsively coupled system is
+closely related with an attractively coupled system and its soliton solution
+becomes a building block of the spatially-periodic structure. That is, the
+spatially-periodic structure can be interpreted as a soliton lattice. An
+approximate form of the soliton is given by a variational method. Furthermore,
+the effects of the rotating harmonic potential and spin-orbit coupling are
+numerically studied.",1812.10218v1
+2013-01-18,Engineering quantum anomalous Hall phases with orbital and spin degrees of freedom,"Combining tight-binding models and first principles calculations, we
+investigate the quantum anomalous Hall (QAH) effect induced by intrinsic
+spin-orbit coupling (SOC) in buckled honeycomb lattice with sp orbitals in an
+external exchange field. Detailed analysis reveals that nontrivial topological
+properties can arise utilizing not only spin but also orbital degrees of
+freedom in the strong SOC limit, when the bands acquire non-zero Chern numbers
+upon undergoing the so-called orbital purification. As a prototype of a buckled
+honeycomb lattice with strong SOC we choose the Bi(111) bilayer, analyzing its
+topological properties in detail. In particular, we show the emergence of
+several QAH phases upon spin exchange of the Chern numbers as a function of SOC
+strength and magnitude of the exchange field. Interestingly, we observe that in
+one of such phases, namely, in the quantum spin Chern insulator phase, the
+quantized charge and spin Hall conductivities co-exist. We consider the
+possibility of tuning the SOC strength in Bi bilayer via alloying with
+isoelectronic Sb, and speculate that exotic properties could be expected in
+such an alloyed system owing to the competition of the topological properties
+of its constituents. Finally, we demonstrate that 3d dopants can be used to
+induce a sizeable exchange field in Bi(111) bilayer, resulting in non-trivial
+Chern insulator properties.",1301.4426v1
+2016-04-26,Spin-orbit torques in locally and globally non-centrosymmetric crystals: Antiferromagnets and ferromagnets,"One of the main obstacles that prevents practical applications of
+antiferromagnets is the difficulty of manipulating the magnetic order
+parameter. Recently, following the theoretical prediction [J. \v{Z}elezn\'y et
+al., PRL 113, 157201 (2014)], the electrical switching of magnetic moments in
+an antiferromagnet has been demonstrated [P. Wadley et al., Science 351, 587
+(2016)]. The switching is due to the so-called spin-orbit torque, which has
+been extensively studied in ferromagnets. In this phenomena a non-equilibrium
+spin-polarization exchange coupled to the ordered local moments is induced by
+current, hence exerting a torque on the order parameter. Here we give a general
+systematic analysis of the symmetry of the spin-orbit torque in locally and
+globally non-centrosymmetric crystals. We study when the symmetry allows for a
+nonzero torque, when is the torque effective, and its dependence on the applied
+current direction and orientation of magnetic moments. For comparison, we
+consider both antiferromagnetic and ferromagnetic orders. In two representative
+model crystals we perform microscopic calculations of the spin-orbit torque to
+illustrate its symmetry properties and to highlight conditions under which the
+spin-orbit torque can be efficient for manipulating antiferromagnetic moments.",1604.07590v1
+2014-06-20,Spin-orbit density wave: A new phase of matter applicable to the hidden order state of URu2Si2,"We provide a brief review and detailed analysis of the spin-orbit density
+wave (SODW), proposed as a possible explanation to the `hidden order' phase of
+URu2Si2. Due to the interplay between inter-orbital Coulomb interaction and
+spin-orbit coupling (SOC) in this compound, the SODW is shown to arise from
+Fermi surface nesting instability between two spin-orbit split bands. An
+effective low-energy Hamiltonian including single-particle SOC and two-particle
+SODW is derived, while numerical results are calculated by using
+density-functional theory (DFT) based band structure input. Computed gapped
+quasiparticle spectrum, entropy loss and spin-excitation spectrum are in
+detailed agreement with experiments. Interestingly, despite the fact that SODW
+governs dynamical spin-excitations, the static magnetic moment is calculated to
+be zero, owing to the time-reversal invariance imposed by SOC. As a
+consequence, SODW can be destroyed by finite magnetic field even at zero
+temperature. Our estimation of the location of the quantum critical point is
+close to the experimental value of Bc ~ 35 T. Finally, we extend the idea of
+SODW to other SOC systems including iridium oxides (iridates) and
+two-dimensional electronic systems such as BiAg2 surface and LaAlO3/SrTiO3
+interface. We show hints of quasiparticle gapping, reduction of preexisting
+magnetic moment, large magneto-resistance etc. in these systems which can be
+explained consistently within the SODW theory.",1406.5271v2
+2021-11-24,"Spin-orbit-entangled nature of magnetic moments and Kitaev magnetism in layered halides $α$-RuX$_3$ (X = Cl, Br, I)","$\alpha$-RuCl$_3$ has been extensively studied recently because of potential
+bond-dependent Kitaev magnetic exchange interactions and the resulting quantum
+spin liquid phase that can be realized therein. It has been known that the
+covalency between Ru 4$d$- and Cl $p$-orbitals is crucial to induce large
+Kitaev interactions in this compound, therefore replacing Cl into heavier
+halogen elements such as Br or I can be a promising way to promote the Kitaev
+interaction even further. In a timely manner, there have been reports on
+synthesis of $\alpha$-RuBr$_3$ and $\alpha$-RuI$_3$, which are expected to host
+the same spin-orbit-entangled orbitals and Kitaev exchange interactions with
+$\alpha$-RuCl$_3$. Here in this work we investigate electronic structures of
+$\alpha$-RuCl$_3$, $\alpha$-RuBr$_3$, and $\alpha$-RuI$_3$ in a comparative
+fashion, focusing on the cooperation of the spin-orbit coupling and on-site
+Coulomb repulsions to realize the spin-orbit-entangled pseudospin-1/2 at Ru
+sites. We further estimate magnetic exchange interactions of all three
+compounds, showing that $\alpha$-RuBr$_3$ can be promising candidates to
+realize Kitaev spin liquid phases in solid-state systems.",2111.12291v2
+2022-08-21,Efficient generation of spin currents by the Orbital Hall effect in pure Cu and Al and their measurement by a Ferris-wheel ferromagnetic resonance technique at the wafer level,"We present a new ferromagnetic resonance (FMR) method that we term the Ferris
+FMR. It is wideband, has significantly higher sensitivity as compared to
+conventional FMR systems, and measures the absorption line rather than its
+derivative. It is based on large-amplitude modulation of the externally applied
+magnetic field that effectively magnifies signatures of the spin-transfer
+torque making its measurement possible even at the wafer-level. Using the
+Ferris FMR, we report on the generation of spin currents from the orbital Hall
+effect taking place in pure Cu and Al. To this end, we use the spin-orbit
+coupling of a thin Pt layer introduced at the interface that converts the
+orbital current to a measurable spin current. While Cu reveals a large
+effective spin Hall angle exceeding that of Pt, Al possesses an orbital Hall
+effect of opposite polarity in agreement with the theoretical predictions. Our
+results demonstrate additional spin- and orbit- functionality for two important
+metals in the semiconductor industry beyond their primary use as interconnects
+with all the advantages in power, scaling, and cost.",2208.09802v1
+2019-11-21,Multiple Spin-Orbit Excitons and the Electronic Structure of $α$-RuCl$_3$,"The honeycomb compound $\alpha$-RuCl$_3$ is widely discussed as a proximate
+Kitaev spin-liquid material. This scenario builds on spin-orbit entangled $j =
+1/2$ moments arising for a $t_{2g}^5$ electron configuration with strong
+spin-orbit coupling $\lambda$ and a large cubic crystal field. The low-energy
+electronic structure of $\alpha$-RuCl$_3$, however, is still puzzling. In
+particular infrared absorption features at 0.30 eV, 0.53 eV, and 0.75 eV seem
+to be at odds with theory. Also the energy of the spin-orbit exciton, the
+excitation from $j = 1/2$ to 3/2, and thus the value of $\lambda$ are
+controversial. Combining infrared and Raman data, we show that the infrared
+features can be attributed to single, double, and triple spin-orbit excitons.
+We find $\lambda$ = 0.16 eV and $\Delta$ =42(4) meV for the observed non-cubic
+crystal-field splitting, supporting the validity of the $j= 1/2$ picture for
+$\alpha$-RuCl$_3$. The unusual strength of the double excitation is related to
+the underlying hopping interactions which form the basis for dominant Kitaev
+exchange.",1911.09337v1
+2016-05-30,Spin Josephson effects in Exchange coupled Anti-ferromagnets,"The energy of exchange coupled antiferromagnetic insulators (AFMIs) is a
+periodic function of the relative in-plane orientation of the N\'{e}el vector
+fields. We show that this leads to oscillations in the relative magnetization
+of exchange coupled AFMIs separated by a thin metallic barrier. These
+oscillations pump a spin current ($I_{S}$) through the metallic spacer that is
+proportional to the rate of change of the relative in-plane orientation of the
+N\'{e}el vector fields. By considering spin-transfer torque induced by a spin
+chemical potential ($V_{S}$) at one of the interfaces, we predict non-Ohmic
+$I_{S}$-$V_{S}$ characteristics of AFMI exchange coupled hetero-structures,
+which leads to a non-local voltage across a spin-orbit coupled metallic spacer.",1605.09427v1
+2020-09-30,Rashba coupling and spin switching through surface states of Dirac semimetals,"We study the effect of the Rashba spin-orbit coupling on the Fermi arcs of
+topological Dirac semimetals. The Rashba coupling is induced by breaking the
+inversion symmetry at the surface. Remarkably, this coupling could be enhanced
+by the interaction with the substrate and controlled by an external electric
+field. We study analytically and numerically the rotation of the spin of the
+surface states as a function of the electron's momentum and the coupling
+strength. Furthermore, a detailed analysis of the spin-dependent two-terminal
+conductance is presented in the clean limit and with the addition of a random
+distribution of impurities. Depending on the magnitude of the quadratic terms
+in the Hamiltonian, the spin-flip conductance may become dominant, thus showing
+the potential of the system for spintronic applications, since the effect is
+robust even in the presence of disorder.",2009.14753v2
+2003-10-07,Electron-phonon induced spin relaxation in InAs quantum dots,"We have calculated spin relaxation rates in parabolic quantum dots due to the
+phonon modulation of the spin-orbit interaction in presence of an external
+magnetic field. Both, deformation potential and piezoelectric electron-phonon
+coupling mechanisms are included within the Pavlov-Firsov spin-phonon
+Hamiltonian. Our results have demonstrated that, in narrow gap materials, the
+electron-phonon deformation potential and piezoelectric coupling give
+comparable contributions as spin relaxation processes. For large dots, the
+deformation potential interaction becomes dominant. This behavior is not
+observed in wide or intermediate gap semiconductors, where the piezoelectric
+coupling, in general, governs the spin relaxation processes. We also have
+demonstrated that spin relaxation rates are particularly sensitive to the
+Land\'e $g$-factor.",0310146v1
+2010-10-07,Electrical manipulation and measurement of spin properties of quantum spin Hall edge states,"We study effects of a gate-controlled Rashba spin-orbit coupling to quantum
+spin-Hall edge states in HgTe quantum wells. A uniform Rashba coupling can be
+employed in tuning the spin orientation of the edge states while preserving the
+time-reversal symmetry. We introduce a sample geometry where the Rashba
+coupling can be used in probing helicity by purely electrical means without
+requiring spin detection, application of magnetic materials or magnetic fields.
+In the considered setup a tilt of the spin orientation with respect to the
+normal of the sample leads to a reduction in the two-terminal conductance with
+current-voltage characteristics and temperature dependence typical of Luttinger
+liquid constrictions.",1010.1353v2
+2011-09-20,Leakage-current lineshapes from inelastic cotunneling in the Pauli spin blockade regime,"We find the leakage current through a double quantum dot in the Pauli spin
+blockade regime accounting for inelastic (spin-flip) cotunneling processes.
+Taking the energy-dependence of this spin-flip mechanism into account allows
+for an accurate description of the current as a function of applied magnetic
+fields, gate voltages, and an inter-dot tunnel coupling. In the presence of an
+additional local dephasing process or nonuniform magnetic field, we obtain a
+simple closed-form analytical expression for the leakage current giving the
+full dependence on an applied magnetic field and energy detuning. This work is
+important for understanding the nature of leakage, especially in systems where
+other spin-flip mechanisms (due, e.g., to hyperfine coupling to nuclear spins
+or spin-orbit coupling) are weak, including silicon and carbon-nanotube or
+graphene quantum dots.",1109.4445v2
+2011-12-19,Nonequilibrium Spin Magnetization Quantum Transport Equations: Spin and Charge Coupling,"The classical Bloch equations of spin magnetization transport is extended to
+fully time-dependent and highly-nonlinear nonequilibrium spin magnetization
+quantum distribution function transport (SMQDFT) equations. The relevant
+variables are the spinor correlation functions which separate into charge and
+spin magnetization distributions that becomes highly coupled in SMQDFT equa-
+tions. The leading terms consist of the Boltzmann kinetic equation with
+spin-orbit coupling in a magnetic eld together with spin-dependent scattering
+terms which contribute to the torque. These do not have analogue within the
+classical relaxation-dephasing picture, but are inherently quantum many-body
+effects. These should incorporate the spatiotemporal-dependent phase-space
+dynam- ics of Elliot-Yafet and Dyakonov-Perel scatterings. The resulting SMQDFT
+equations should serve as a theoretical foundation for computational spintronic
+and nanomagnetic device applications, in ultrafast-switching-speed/low-power
+performance and reliability analyses.",1112.4220v2
+2014-03-11,Generation and Electric Control of Spin-Coupled Valley Current in WSe2,"The valley degree of freedom in layered transition-metal dichalcogenides
+(MX2) provides the opportunity to extend functionalities of novel spintronics
+and valleytronics devices. Due to spin splitting induced by spin-orbital
+coupling (SOC), the non-equilibrium charge carrier imbalance between two
+degenerate and inequivalent valleys to realize valley/spin polarization has
+been successfully demonstrated theoretically and supported by optical
+experiments. However, the generation of a valley/spin current by the valley
+polarization in MX2 remains elusive and a great challenge. Here, within an
+electric-double-layer transistor based on WSe2, we demonstrated a spin-coupled
+valley photocurrent whose direction and magnitude depend on the degree of
+circular polarization of the incident radiation and can be further greatly
+modulated with an external electric field. Such room temperature generation and
+electric control of valley/spin photocurrent provides a new property of
+electrons in MX2 systems, thereby enabling new degrees of control for
+quantum-confined spintronics devices.",1403.2696v1
+2024-02-01,Spin wave-driven variable-phase mutual synchronization in spin Hall nano-oscillators,"Spin-orbit torque can drive auto-oscillations of propagating spin wave (PSW)
+modes in nano-constriction spin Hall nano-oscillators (SHNOs). These modes
+allow both long-range coupling and the potential of controlling its phase --
+critical aspect for nano-magnonics, spin wave logic, and Ising machines. Here,
+we demonstrate PSW-driven variable-phase coupling between two nano-constriction
+SHNOs and study how their separation and the PSW wave vector impact their
+mutual synchronization. In addition to ordinary in-phase mutual
+synchronization, we observe, using both electrical measurements and
+phase-resolved $\mu-$Brillouin Light Scattering microscopy, mutual
+synchronization with a phase that can be tuned from 0 to $\pi$ using the drive
+current or the applied field. Micromagnetic simulations corroborate the
+experiments and visualize how the PSW patterns in the bridge connecting the two
+nano-constrictions govern the coupling. These results advance the capabilities
+of mutually synchronized SHNOs and open up new possibilities for applications
+in spin wave logic, unconventional computing, and Ising Machines.",2402.00586v1
+2016-11-17,Dynamic localization in optical and Zeeman lattices in the presence of spin-orbit coupling,"The dynamic localization of a two-level atom in a periodic potential under
+the action of spin-orbit coupling and a weak harmonically-varying linear force
+is studied. We consider optical and Zeeman potentials that are either in-phase
+or out-of-phase in two spinor components, respectively. The expectation value
+for the position of the atom after one oscillation period of the linear force
+is recovered in authentic resonances or in pseudo-resonances. The frequencies
+of the linear force corresponding to authentic resonances are determined by the
+band structure of the periodic potential and are affected by the spin-orbit
+coupling. The width/dispersion of the wavepacket in authentic resonances is
+usually minimal. The frequencies corresponding to pseudo-resonances do not
+depend on the type of potential and on the strength of the spin-orbit coupling,
+while the evolution of excitations at the corresponding frequencies is usually
+accompanied by significant dispersion. Pseudo-resonances are determined by the
+initial phase of the linear force and by the quasi-momentum of the wavepacket.
+Due to the spinor nature of the system, the motion of the atom is accompanied
+by periodic, but not harmonic, spin oscillations. Under the action of
+spin-orbit coupling the oscillations of the wavepacket can be nearly completely
+suppressed in optical lattices. Dynamic localization in Zeeman lattices is
+characterized by doubling of the resonant oscillation periods due to band
+crossing at the boundary of the Brillouin zone. We also show that higher
+harmonics in the Fourier expansion of the energy band lead to effective
+dispersion, which can be strong enough to prevent dynamic localization of the
+Bloch wavepacket.",1611.05745v1
+2015-12-07,Recent progress on correlated electron systems with strong spin-orbit coupling,"Emergence of novel quantum ground states in correlated electron systems with
+strong spin-orbit coupling has been a recent subject of intensive studies.
+While it has been realized that spin-orbit coupling can provide non-trivial
+band topology in weakly interacting electron systems, as in topological
+insulators and semi-metals, the role of electron-electron interaction in
+strongly spin-orbit coupled systems has not been fully understood. The
+availability of new materials with significant electron correlation and strong
+spin-orbit coupling now makes such investigations possible. Many of these
+materials contain 5d or 4d transition metal elements; the prominent examples
+are iridium oxides or iridates. In this review, we succinctly discuss recent
+theoretical and experimental progress on this subject. After providing a brief
+overview, we focus on pyrochlore iridates and three-dimensional honeycomb
+iridates. In pyrochlore iridates, we discuss the quantum criticality of the
+bulk and surface states, and the relevance of the surface/boundary states in a
+number of topological and magnetic ground states, both in the bulk and thin
+film configurations. Experimental signatures of these boundary and bulk states
+are discussed. Domain wall formation and strongly-direction-dependent
+magneto-transport are also discussed. Regarding the three-dimensional honeycomb
+iridates, we consider possible quantum spin liquid phases and unusual magnetic
+orders in theoretical models with strongly bond-dependent interactions. These
+theoretical ideas and results are discussed in light of recent resonant X-ray
+scattering experiments on three-dimensional honeycomb iridates. We also
+contrast these results with the situation in two-dimensional honeycomb
+iridates. We conclude with the outlook on other related systems.",1512.02224v1
+2019-04-03,Possible superconductivity induced by a large spin-orbit coupling in carrier doped iridium oxide insulators: A weak coupling approach,"We study possible superconductivity in a carrier-doped iridium oxide
+insulator Sr$_{2}$IrO$_{4}$ based on an effective $t_{2g}$ three-orbital
+Hubbard model on the square lattice with a large spin-orbit coupling (SOC).
+Numerically solving the linearized Eliashberg equation for the superconducting
+(SC) gap function with the random phase approximation, we systematically
+examine both singlet and triplet SC gap functions with possible pairing
+symmetries and the parameter dependence of the superconductivity. For the
+realistic SOC $\lambda$ and Hund's coupling $J/U$ relevant to
+Sr$_{2}$IrO$_{4}$, namely, for a large $\lambda$ and small $J/U$ region, we
+find that the intra-band antiferromagnetic (AF) pseudospin $\bm{j}_{\text{eff}}
+= -\bm{l}+\bm{s}$ fluctuations favor a $d_{x^{2}-y^{2}}$-wave pseudospin
+$j_{\text{eff}}=1/2$ singlet pairing in the electron-doping. We also find that
+the $d_{x^{2}-y^{2}}$-wave pairing is more stabilized with increasing the SOC
+and decreasing the Hund's coupling. Furthermore, we show for a small $\lambda$
+and large $J/U$ region that an $s_{\pm}$-wave singlet pairing is favored in the
+hole-doped region. The origin of the $s_{\pm}$-wave pairing is due to the
+inter-band pair scattering arising from the intra-orbital AF spin $\bm s$
+fluctuations. Although the possibility of a pseudospin triplet pairing is
+considered, we find it always unfavorable for all parameters studied here. The
+experimental consequences for other strongly correlated materials with a large
+SOC are also discussed.",1904.01812v1
+2003-01-20,A proposal of an orbital-dependent correlation energy functional for energy-band calculations,"An explicitly orbital-dependent correlation energy functional is proposed,
+which is to be used in combination with the orbital-dependent exchange energy
+functional in energy-band calculations. It bears a close resemblance to the
+second-order direct and exchange perturbation terms calculated with Kohn-Sham
+orbitals and Kohn-Sham energies except that one of the two Coulomb interactions
+entering each term is replaced by an effective interaction which contains
+information about long-, intermediate-, and short-range correlations beyond
+second-order perturbation theory. Such an effective interaction can rigorously
+be defined for the correlation energy of the uniform electron liquid and is
+evaluated with high accuracy in order to apply to the orbital-dependent
+correlation energy functional. The coupling-constant-averaged spin-parallel and
+spin-antiparallel pair correlation functions are also evaluated with high
+accuracy for the electron liquid. The present orbital-dependent correlation
+energy functional with the effective interaction borrowed from the electron
+liquid is valid for tightly-binding electrons as well as for nearly-free
+electrons in marked contrast with the conventional local density approximation.",0301344v2
+2012-07-12,Linear Magnetoelectric Effect by Orbital Magnetism,"We use symmetry analysis and first principles calculations to show that the
+linear magnetoelectric effect can originate from the response of orbital
+magnetic moments to the polar distortions induced by an applied electric field.
+Using LiFePO4 as a model compound we show that spin-orbit coupling partially
+lifts the quenching of the 3d orbitals and causes small orbital magnetic
+moments ($\mu_{(L)}\approx 0.3 \mu_B$) parallel to the spins of the Fe$^{2+}$
+ions. An applied electric field $\mathbf{E}$ modifies the size of these orbital
+magnetic moments inducing a net magnetization linear in $\mathbf{E}$.",1207.2916v2
+2004-08-23,Orbital-controlled magnetic transition between gapful and gapless phases in the Haldane system with t2g-orbital degeneracy,"In order to clarify a key role of orbital degree of freedom in the spin S=1
+Haldane system, we investigate ground-state properties of the t2g-orbital
+degenerate Hubbard model on the linear chain by using numerical techniques.
+Increasing the Hund's rule coupling in multi-orbital systems, in general, there
+occurs a transition from an antiferromagnetic to a ferromagnetic phase. We find
+that the antiferromagnetic phase is described as the Haldane system with spin
+gap, while in the ferromagnetic phase, there exists the gapless excitation with
+respect to orbital degree of freedom. Possible relevance of the present results
+to actual systems is also discussed.",0408479v1
+2012-03-23,Complete phase diagram for three-band Hubbard model with orbital degeneracy lifted by crystal field splitting,"Motivated by the unexplored complexity of the phase diagrams for
+multi-orbital Hubbard models, a three-band Hubbard model at integer fillings
+(N=4) with orbital degeneracy lifted partially by crystal field splitting is
+analyzed systematically in this work. By using single site dynamical mean-field
+theory and rotationally invariant Gutzwiller approximation, we have computed
+the full phase diagram with Coulomb interaction strength $U$ and crystal field
+splitting $\Delta$. We find a large region in the phase diagram, where an
+orbital selective Mott phase will be stabilized by the positive crystal field
+lifting the orbital degeneracy. Further analysis indicates that the Hund's rule
+coupling is essential for the orbital selective Mott phase and the transition
+toward this phase is accompanied by a high-spin to low-spin transition. Such a
+model may be relevant for the recently discovered pnictides and ruthenates
+correlated materials.",1203.5159v1
+2023-06-02,Zeeman and Orbital Driven Phase Transitions in Planar Josephson Junctions,"We perform supercurrent and tunneling spectroscopy measurements on
+gate-tunable InAs/Al Josephson junctions (JJs) in an in-plane magnetic field,
+and report on phase shifts in the current-phase relation measured with respect
+to an absolute phase reference. The impact of orbital effects is investigated
+by studying multiple devices with different superconducting lead sizes. At low
+fields, we observe gate-dependent phase shifts of up to ${\varphi_{0}=0.5\pi}$
+which are consistent with a Zeeman field coupling to highly-transmissive
+Andreev bound states via Rashba spin-orbit interaction. A distinct phase shift
+emerges at larger fields, concomitant with a switching current minimum and the
+closing and reopening of the superconducting gap. These signatures of an
+induced phase transition, which might resemble a topological transition, scale
+with the superconducting lead size, demonstrating the crucial role of orbital
+effects. Our results elucidate the interplay of Zeeman, spin-orbit and orbital
+effects in InAs/Al JJs, giving new understanding to phase transitions in hybrid
+JJs and their applications in quantum computing and superconducting
+electronics.",2306.01514v2
+2013-08-24,Spin Dynamics in Graphene and Graphene like Nanocarbon Doped with Nitrogen the ESR Analysis,"Nano engineered spin degree of freedom in carbon system may offer desired
+exchange coupling with optimum spin orbit interaction which is essential, to
+construct solid state qubits, for fault tolerant quantum computation. The
+purpose of this communication is to analyze spin dynamics of, basically, four
+types of systems, (i) Graphene (system with inversion symmetry), (ii) Graphene
+like nanocarbons (GNCs, broken inversion symmetry and heterostructure, sp2 and
+sp3, environment), and (iii) their nitrogen doped derivatives. The spin
+transport data was obtained using the electron spin resonance spectroscopy
+(ESR) technique, carried out over 123 to 473K temperature range. Analysis of
+shape, linewidths of dispersion derivatives,, and g factor anisotropy has been
+carried out. Spin parameters such as, spin spin relaxation time, spin lattice
+relaxation time, spin flip parameter,spin relaxation rate,spin, momentum
+relaxation rate,pseudo chemical potential, density of states, effective
+magnetic moment, spin concentration, defect concentration, and Pauli
+susceptibility, has been estimated, and examined for their temperature as well
+as interdependence. Details of the analysis are presented. The quantitative
+study underlined the following facts: (i) by and large, spin dynamics in
+Graphene and GNCs is significantly different, (ii) transport of spin behaves in
+opposite fashion, after doping nitrogen, in both the systems, (iii) reduction
+in the magnetization has been observed for both GNCs and Graphene, after doping
+nitrogen, (iv) hyperfine interactions have been observed in all classes of
+systems except in GNCs, (v) nitrogen doped GNCs seems to be appropriate for
+qubit designing.",1308.5291v1
+2023-07-30,"Ab-initio predictions of spin relaxation, dephasing and diffusion in solids","Spin relaxation, dephasing and diffusion are at the heart of spin-based
+information technology. Accurate theoretical approaches to simulate spin
+lifetimes ($\tau_s$), determining how fast the spin polarization and phase
+information will be lost, are important to the understandings of underlying
+mechanism of these spin processes, and invaluable to search for promising
+candidates of spintronic materials. Recently, we develop a first-principles
+real-time density-matrix (FPDM) approach to simulate spin dynamics for general
+solid-state systems. Through the complete first-principles' descriptions of
+light-matter interaction and scattering processes including electron-phonon,
+electronimpurity and electron-electron scatterings with self-consistent
+spin-orbit coupling, as well as ab initio Land'e g-factor, our method can
+predict $\tau_s$ at various conditions as a function of carrier density and
+temperature, under electric and magnetic fields. By employing this method, we
+successfully reproduce experimental results of disparate materials and identify
+the key factors affecting spin relaxation, dephasing, and diffusion in
+different materials. Specifically, we predict that germanene has long $\tau_s$
+(~100 ns at 50 K), a giant spin lifetime anisotropy and spin-valley locking
+effect under electric fields, making it advantageous for spin-valleytronic
+applications. Based on our theoretical derivations and ab initio simulations,
+we propose a new useful electronic quantity, named spin-flip angle
+$\theta^{\uparrow\downarrow}$, for the understanding of spin relaxation through
+intervalley spin-flip scattering processes. Our method can be further applied
+to other emerging materials and extended to simulate exciton spin dynamics and
+steady-state photocurrents due to photogalvanic effect.",2307.16311v1
+2008-12-08,Spin diffusion in Si/SiGe quantum wells: spin relaxation in the absence of D'yakonov-Perel' relaxation mechanism,"In this work, the spin relaxation accompanying the spin diffusion in
+symmetric Si/SiGe quantum wells without the D'yakonov-Perel' spin-relaxation
+mechanism is calculated from a fully microscopic approach. The spin relaxation
+is caused by the inhomogeneous broadening from the momentum-dependent spin
+precessions in spatial domain under a magnetic field in the Voigt
+configuration. In fact, this inhomogeneous broadening together with the
+scattering lead to an irreversible spin relaxation along the spin diffusion.
+The effects of scattering, magnetic field and electron density on spin
+diffusion are investigated. Unlike the case of spin diffusion in the system
+with the D'yakonov-Perel' spin-orbit coupling such as GaAs quantum wells where
+the scattering can either enhance or reduce spin diffusion depending on whether
+the system is in strong or weak scattering limit, the scattering in the present
+system has no counter-effect on the inhomogeneous broadening and suppresses the
+spin diffusion monotonically. The increase of magnetic field reduces the spin
+diffusion, while the increase of electron density enhances the spin diffusion
+when the electrons are degenerate but has marginal effect when the electrons
+are nondegenerate.",0812.1477v2
+2011-07-06,Addressing the spin question in gravitational-wave searches: Waveform templates for inspiralling compact binaries with nonprecessing spins,"This paper presents a post-Newtonian (PN) template family of gravitational
+waveforms from inspiralling compact binaries with non-precessing spins, where
+the spin effects are described by a single ""reduced-spin"" parameter. This
+template family, which reparametrizes all the spin-dependent PN terms in terms
+of the leading-order (1.5PN) spin-orbit coupling term \emph{in an approximate
+way}, has very high overlaps (fitting factor > 0.99) with non-precessing
+binaries with arbitrary mass ratios and spins. We also show that this template
+family is ""effectual"" for the detection of a significant fraction of generic
+spinning binaries in the comparable-mass regime (m_2/m_1 <~ 10), providing an
+attractive and feasible way of searching for gravitational waves (GWs) from
+spinning low-mass binaries. We also show that the secular (non-oscillatory)
+spin-dependent effects in the phase evolution (which are taken into account by
+the non-precessing templates) are more important than the oscillatory effects
+of precession in the comparable-mass (m_1 ~= m_2) regime. Hence the
+effectualness of non-spinning templates is particularly poor in this case, as
+compared to non-precessing-spin templates. For the case of binary neutron stars
+observable by Advanced LIGO, even moderate spins (L . S/m^2 ~= 0.015 - 0.1)
+will cause considerable mismatches (~ 3% - 25%) with non-spinning templates.
+This is contrary to the expectation that neutron-star spins may not be relevant
+for GW detection.",1107.1267v2
+2014-11-12,Spin Hall effect,"Spin Hall effects are a collection of relativistic spin-orbit coupling
+phenomena in which electrical currents can generate transverse spin currents
+and vice versa. Although first observed only a decade ago, these effects are
+already ubiquitous within spintronics as standard spin-current generators and
+detectors. Here we review the experimental and theoretical results that have
+established this sub-field of spintronics. We focus on the results that have
+converged to give us a clear understanding of the phenomena and how they have
+evolved from a qualitative to a more quantitative measurement of spin-currents
+and their associated spin-accumulation. Within the experimental framework, we
+review optical, transport, and magnetization-dynamics based measurements and
+link them to both phenomenological and microscopic theories of the effect.
+Within the theoretical framework, we review the basic mechanisms in both the
+extrinsic and intrinsic regime which are linked to the mechanisms present in
+their closely related phenomenon in ferromagnets, the anomalous Hall effect. We
+also review the connection to the phenomenological treatment based on
+spin-diffusion equations applicable to certain regimes, as well as the
+spin-pumping theory of spin-generation which has proven important in the
+measurements of the spin Hall angle. We further connect the spin-current
+generating spin Hall effect to the inverse spin galvanic effect, which often
+accompanies the SHE, in which an electrical current induces a non-equilibrium
+spin polarization. These effects share common microscopic origins and can
+exhibit similar symmetries when present in ferromagnetic/non-magnetic
+structures through their induced current-driven spin torques. Although we give
+a short chronological overview, the main body is structured from a pedagogical
+point of view, focusing on well-established and accepted physics.",1411.3249v1
+2016-07-22,The Spin Nernst effect in Tungsten,"The spin Hall effect allows generation of spin current when charge current is
+passed along materials with large spin orbit coupling. It has been recently
+predicted that heat current in a non-magnetic metal can be converted into spin
+current via a process referred to as the spin Nernst effect. Here we report the
+observation of the spin Nernst effect in W. In W/CoFeB/MgO heterostructures, we
+find changes in the longitudinal and transverse voltages with magnetic field
+when temperature gradient is applied across the film. The field-dependence of
+the voltage resembles that of the spin Hall magnetoresistance. A comparison of
+the temperature gradient induced voltage and the spin Hall magnetoresistance
+allows direct estimation of the spin Nernst angle. We find the spin Nernst
+angle of W to be similar in magnitude but opposite in sign with its spin Hall
+angle. Interestingly, under an open circuit condition, such sign difference
+results in spin current generation larger than otherwise. These results
+highlight the distinct characteristics of the spin Nernst and spin Hall
+effects, providing pathways to explore materials with unique band structures
+that may generate large spin current with high efficiency.",1607.06594v2
+2019-03-03,Non-Kitaev spin liquids in Kitaev materials,"We point out that the Kitaev materials may not necessarily support Kitaev
+spin liquid. It is well-known that having a Kitaev term in the spin interaction
+is not the sufficient condition for the Kitaev spin liquid ground state. Many
+other spin liquids may be stabilized by the competing spin interactions of the
+systems. We thus explore the possibilities of non-Kitaev spin liquids in the
+honeycomb Kitaev materials. We carry out a systematic classification of gapped
+$\mathbb{Z}_2$ spin liquids using the Schwinger boson representation for the
+spin variables. The presence of strong spin-orbit coupling in the Kitaev
+materials brings new ingredients into the projective symmetry group
+classification of the non-Kitaev spin liquid. We predict the spectroscopic
+properties of these gapped non-Kitaev spin liquids. Moreover, among the gapped
+spin liquids that we discover, we identify the spin liquid whose spinon
+condensation leads to the magnetic Bragg peak structure of the zig-zag magnetic
+order that was observed in Na$_2$IrO$_3$ and $\alpha$-RuCl$_3$. We further
+discuss the possibility of gapped $\mathbb{Z}_2$ spin liquid and the deconfined
+quantum criticality from the zig-zag magnetic order to spin dimerization in
+pressurized $\alpha$-RuCl$_3$.",1903.00895v2
+2018-02-12,Influence of multiplet structure on photoemission spectra of spin-orbit driven Mott insulators: application to $\bf{Sr_2IrO_4}$,"Most of the low-energy effective descriptions of spin-orbit driven Mott
+insulators consider spin orbit coupling (SOC) as a second order perturbation to
+electron-electron interactions. However, when SOC is comparable to anisotropic
+Hund's coupling, such as in Ir, validity of this formally weak-SOC approach is
+not a priori known. Depending on the relative strength of SOC and anisotropic
+Hund's coupling, different descriptions of the multiplet structure should be
+employed in the weak and strong SOC limits, \textit{viz.} \textit{LS} and
+\textit{jj} coupling schemes, respectively. We investigate the implications of
+both the coupling schemes on the low-energy effective $t-J$ model and calculate
+the angle resolved photoemission (ARPES) spectra using self-consistent Born
+approximation. In particular, we obtain the ARPES spectra of
+quasi-two-dimensional square-lattice iridate ${\rm Sr_2IrO_4}$ in both weak and
+strong SOC limits. The differences in the limiting cases are understood in
+terms of the composition and relative energy splittings of the multiplet
+structure. Our results indicate that the LS coupling scheme yields better
+agreement with the experiment, thus providing an indirect evidence for the
+validity of LS coupling scheme for iridates. We also discuss the implications
+for other metal ions with strong SOC.",1802.04158v3
+2020-02-12,Interplay between spin-orbit coupling and van Hove singularity in the Hund's metallicity of Sr$_2$RuO$_4$,"We investigate the dynamical properties of Sr$_2$RuO$_4$ at zero and very low
+temperature using density functional theory plus dynamical mean-field theory
+with an exact diagonalization solver. By considering rotationally invariant
+local interaction, we examine how Hund's coupling and spin-orbit coupling
+affect the correlated nature of the system. In the absence of Hund's coupling,
+the system shows a Fermi liquid behavior over the entire range of temperatures
+we consider. We confirm that the Fermi liquid persists at zero temperature even
+with nonzero Hund's coupling; however, at sufficient temperatures Hund's
+coupling significantly reduces the Fermi liquid regime and the system evolves
+into a typical Hund's metal. At the bare electronic occupancy of Sr$_2$RuO$_4$
+($t_{2g}^4$), a stronger Hund's metallicity accompanies a larger long-time
+correlator. Remarkably, electron doping further destabilizes the Fermi liquid
+even though the long-time correlator and magnetic fluctuations decrease upon
+doping. This suppression of the Fermi liquid is driven by the van Hove
+singularity above the Fermi level in Sr$_2$RuO$_4$, combined with an enhanced
+Van Vleck susceptibility by spin-orbit coupling. Such findings point to the
+important role that electronic structure plays in the behavior of Hund's
+metals, in addition to magnetic fluctuations.",2002.04825v2
+2012-02-28,Anisotropic intrinsic spin relaxation in graphene due to flexural distortions,"We propose an intrinsic spin scattering mechanism in graphene originated by
+the interplay of atomic spin-orbit interaction and the local curvature induced
+by flexural distortions of the atomic lattice. Starting from a multiorbital
+tight-binding Hamiltonian with spin-orbit coupling considered
+non-perturbatively, we derive an effective Hamiltonian for the spin scattering
+of the Dirac electrons due to flexural distortions. We compute the spin
+lifetime due to both flexural phonons and ripples and we find values in the
+microsecond range at room temperature. Interestingly, this mechanism is
+anisotropic on two counts. First, the relaxation rate is different for
+off-plane and in-plane spin quantization axis. Second, the spin relaxation rate
+depends on the angle formed by the crystal momentum with the carbon-carbon
+bond. In addition, the spin lifetime is also valley dependent. The proposed
+mechanism sets an upper limit for spin lifetimes in graphene and will be
+relevant when samples of high quality can be fabricated free of extrinsic
+sources of spin relaxation.",1202.6216v2
+2014-06-24,Real-time dynamics of spin-dependent transport through a double-quantum-dot Aharonov-Bohm interferometer with spin-orbit interaction,"The spin-resolved non-equilibrium real-time electron transport through a
+double-quantum-dot (DQD) Aharonov-Bohm (AB) interferometer with spin-orbit
+interaction (SOI) is explored. The SOI and AB interference in the real-time
+dynamics of spin transport is expressed by effective magnetic fluxes.
+Analytical formulae for the time-dependent currents, for initially unpolarized
+spins, are presented. In many cases, there appear spin currents in the
+electrodes, for which the spins in each electrode are polarized along
+characteristic directions, pre-determined by the SOI parameters and by the
+geometry of the system. Special choices of the system parameters yield
+steady-state currents in which the spins are fully polarized along these
+characteristic directions. The time required to reach this steady state depends
+on the couplings of the DQD to the leads. The magnitudes of the currents depend
+strongly on the SOI-induced effective fluxes. Without the magnetic flux, the
+spin-polarized current cannot be sustained to the steady states, due to the
+phase rigidity for this system. For a non-degenerate DQD, transient spin
+transport can be produced by the sole effects of SOI. We also show that one can
+extract the spin-resolved currents from measurements of the total charge
+current.",1406.6258v2
+2017-06-22,Observation of anomalous spin-torque generated by a ferromagnet,"In this work we report observation of in-plane current induced out-of-plane
+magnetic field driven torque in spin valve structure. Since ferromagnet has
+high spin orbit coupling it is expected to be the source of spin-orbit-torque
+as it possesses anomalous-Hall-effect (AHE: equivalent to spin Hall effect in
+heavy metal). So we have carried out spin-torque ferromagnetic resonance
+(ST-FMR) experiment in a spin valve (consists of a fixed magnet and a free
+magnet which are separated by Cu spacer), passing in-plane radio frequency
+current and measuring DC voltage. Our experimental results eventually indicate
+that spin torque exerted on the free magnet is not caused due to the spin
+current injection by the fixed magnet owing to its AHE, but it is originated
+from in-plane current driven out-of plane effective magnetic field. This is new
+class of spin torque which is completely different from Slonczewski-spin
+transfer torque and Rashba like field like torque. The effective out-of plane
+magnetic field depends on the direction of current (in-plane) and magnetization
+(in-plane) of the pinned layer. One possible mechanism behind this
+unconventional torque could be intefacial spin-scattering which is also origin
+of current in-plane GMR effect. Most importantly this effective out-of plane
+torque can be useful to switch out-of plane magnetic bits in spintronic memory
+application.",1706.07245v1
+2022-08-26,Anisotropic linear and nonlinear charge-spin conversion in topological semimetal SrIrO3,"Over the past decade, utilizing spin currents in the linear response of
+electric field to manipulate magnetization states via spin-orbit torques (SOTs)
+is one of the core concepts for realizing a multitude of spintronic devices.
+Besides the linear regime, recently, nonlinear charge-spin conversion under the
+square of electric field has been recognized in a wide variety of materials
+with nontrivial spin textures, opening an emerging field of nonlinear
+spintronics. Here, we report the investigation of both linear and nonlinear
+charge-spin conversion in one single topological semimetal SrIrO3(110) thin
+film that hosts strong spin-orbit coupling and nontrivial spin textures in the
+momentum space. In the nonlinear regime, the observation of crystalline
+direction dependent response indicates the presence of anisotropic surface
+states induced spin-momentum locking near the Fermi level. Such anisotropic
+spin textures also give rise to spin currents in the linear response regime,
+which mainly contributes to the fieldlike SOT component. Our work demonstrates
+the power of combination of linear and nonlinear approaches in understanding
+and utilizing charge-spin conversion in topological materials.",2208.12499v1
+2023-09-01,Breakdown of the drift-diffusion model for transverse spin transport in a disordered Pt film,"Spin accumulation and spin current profiles are calculated for a disordered
+Pt film subjected to an in-plane electric current within the nonequilibrium
+Green function approach. In the bulklike region of the sample, this approach
+captures the intrinsic spin Hall effect found in other calculations. Near the
+surfaces, the results reveal qualitative differences with the results of the
+widely used spin-diffusion model, even when the boundary conditions are
+modified to try to account for them. One difference is that the effective
+spin-diffusion length for transverse spin transport is significantly different
+from its longitudinal counterpart and is instead similar to the mean-free path.
+This feature may be generic for spin currents generated via the intrinsic
+spin-Hall mechanism because of the differences in transport mechanisms compared
+to longitudinal spin transport. Orbital accumulation in the Pt film is only
+significant in the immediate vicinity of the surfaces and has a small component
+penetrating into the bulk only in the presence of spin-orbit coupling, as a
+secondary effect induced by the spin accumulation.",2309.00183v2
+2023-10-05,Spin-orbit torques and spin Hall magnetoresistance generated by twin-free and amorphous Bi0.9Sb0.1 topological insulator films,"Topological insulators have attracted great interest as generators of
+spin-orbit torques (SOTs) in spintronic devices.
+Bi\textsubscript{1-x}Sb\textsubscript{x} is a prominent topological insulator
+that has a high charge-to-spin conversion efficiency. However, the origin and
+magnitude of the SOTs induced by current-injection in
+Bi\textsubscript{1-x}Sb\textsubscript{x} remain controversial. Here we report
+the investigation of the SOTs and spin Hall magnetoresistance resulting from
+charge-to-spin conversion in twin-free epitaxial layers of
+Bi\textsubscript{0.9}Sb\textsubscript{0.1}(0001) coupled to FeCo, and compare
+it with that of amorphous Bi\textsubscript{0.9}Sb\textsubscript{0.1}. We find a
+large charge-to-spin conversion efficiency of 1 in the first case and less than
+0.1 in the second, confirming crystalline
+Bi\textsubscript{0.9}Sb\textsubscript{0.1} as a strong spin injector material.
+The SOTs and spin Hall magnetoresistance are independent of the direction of
+the electric current, indicating that charge-to-spin conversion in
+single-crystal Bi\textsubscript{0.9}Sb\textsubscript{0.1}(0001) is isotropic
+despite the strong anisotropy of the topological surface states. Further, we
+find that the damping-like SOT has a non-monotonic temperature dependence with
+a minimum at 20~K. By correlating the SOT with resistivity and weak
+antilocalization measurements, we conclude that charge-spin conversion occurs
+via thermally-excited holes from the bulk states above 20~K, and conduction
+through the isotropic surface states with increasing spin polarization due to
+decreasing electron-electron scattering below 20~K.",2310.03487v1
+2016-03-31,Dynamical spin properties of confined Fermi and Bose systems in presence of spin-orbit coupling,"Due to the recent experimental progress, tunable spin-orbit (SO) interactions
+represent ideal candidates for the control of polarization and dynamical spin
+properties in both quantum wells and cold atomic systems. A detailed
+understanding of spin properties in SO coupled systems is thus a compelling
+prerequisite for possible novel applications or improvements in the context of
+spintronics and quantum computers. Here we analyze the case of equal Rashba and
+Dresselhaus couplings in both homogeneous and laterally confined
+two-dimensional systems. Starting from the single-particle picture and
+subsequently introducing two-body interactions we observe that periodic spin
+fluctuations can be induced and maintained in the system. Through an analytical
+derivation we show that the two-body interaction does not involve decoherence
+effects in the bosonic dimer, and, in the repulsive homogeneous Fermi gas it
+may be even exploited in combination with the SO coupling to induce and tune
+standing currents. By further studying the effects of a harmonic lateral
+confinement --a particularly interesting case for Bose condensates-- we
+evidence the possible appearance of non-trivial {\it spin textures}, whereas
+the further application of a small Zeeman-type interaction can be exploited to
+fine-tune the system polarizability.",1603.09604v1
+2023-11-19,Spin-orbit coupling in a half-filled $t_{2g}$ shell: the case of $5d^3$ K$_2$ReCl$_6$,"The half-filled $t_{2g}$ shell of the $t_{2g}^3$ configuration usually, in LS
+coupling, hosts a S = 3/2 ground state with quenched orbital moment. This state
+is not Jahn-Teller active. Sufficiently large spin-orbit coupling $\zeta$ has
+been predicted to change this picture by mixing in orbital moment, giving rise
+to a sizable Jahn-Teller distortion. In $5d^3$ K$_2$ReCl$_6$ we study the
+electronic excitations using resonant inelastic x-ray scattering (RIXS) and
+optical spectroscopy. We observe on-site intra-$t_{2g}$ excitations below 2 eV
+and corresponding overtones with two intra-$t_{2g}$ excitations on adjacent
+sites, the Mott gap at 2.7 eV, $t_{2g}$-to-$e_g$ excitations above 3 eV, and
+charge-transfer excitations at still higher energy. The intra-$t_{2g}$
+excitation energies are a sensitive measure of $\zeta$ and Hund's coupling
+$J_H$. The sizable value of $\zeta \approx$ 0.29 eV places K$_2$ReCl$_6$ into
+the intermediate coupling regime, but $\zeta/J_H \approx 0.6$ is not
+sufficiently large to drive a pronounced Jahn-Teller effect. We discuss the
+ground state wavefunction in a Kanamori picture and find that the S = 3/2
+multiplet still carries about 97 % of the weight. However, the finite admixture
+of orbital moment allows for subtle effects. We discuss small
+temperature-induced changes of the optical data and find evidence for a
+lowering of the ground state by about 3 meV below the structural phase
+transitions.",2311.11419v1
+2015-07-28,Observation of intervalley quantum interference in epitaxial monolayer WSe2,"Monolayer (ML) transition metal dichalcogenides (TMDs) have been attracting
+great research attentions lately for their extraordinary properties, in
+particular the exotic spin-valley coupled electronic structures that promise
+future spintronic and valleytronic applications1-3. The energy bands of ML TMDs
+have well separated valleys that constitute effectively an extra internal
+degree of freedom for low energy carriers3-12. The large spin-orbit coupling in
+the TMDs makes the spin index locked to the valley index, which has some
+interesting consequences such as the magnetoelectric effects in 2H bilayers13.
+A direct experimental characterization of the spin-valley coupled electronic
+structure can be of great interests for both fundamental physics and device
+applications. In this work, we report the first experimental observation of the
+quasi-particle interference (QPI) patterns in ML WSe2 using low-temperature
+(LT) scanning tunneling microscopy/spectroscopy (STM/S). We observe intervalley
+quantum interference involving the Q-valleys in the conduction band due to
+spin-conserved scattering processes, while spin-flip intervalley scattering is
+absent. This experiment establishes unequivocally the presence of spin-valley
+coupling and affirms the large spin-splitting at the Q valleys. Importantly,
+the inefficient spin-flip intervalley scattering implies long valley and spin
+lifetime in ML WSe2, which represents a key figure of merit for
+valley-spintronic applications.",1507.07637v1
+2021-08-11,Charge density waves in multiple-$Q$ spin states,"Coupling between spin and charge degrees of freedom in electrons is a source
+of various electronic and magnetic properties of solids. We theoretically study
+charge density waves induced by the spin-charge coupling in the presence of
+magnetic orderings in itinerant magnets. By performing a perturbative
+calculation in the weak-coupling limit of the Kondo lattice model, we derive a
+useful formula for the relationship between charge and spin density waves,
+which can be applied to any magnetic orderings, including noncollinear and
+noncoplanar ones composed of multiple spin density waves called multiple-$Q$
+magnetic orderings. We demonstrate the predictive power for single-$Q$ and
+double-$Q$ states including skyrmion and meron-antimeron crystals on a square
+lattice, in comparison with the numerical calculations. Moreover, we show that
+the charge density waves contain richer information than the spin density
+waves, and are indeed useful in distinguishing the spin textures with similar
+spin structure factors. We discuss the relation to bond modulation in terms of
+the kinetic bond energy and the vector spin chirality. We also perform
+numerical calculations beyond the perturbative regime and find that the charge
+density waves can be enhanced when the electron filling is commensurate.
+Furthermore, we investigate the effect of the spin-orbit coupling, which can
+lead to additional charge density waves owing to effective anisotropic magnetic
+interactions in momentum space. Our result will provide a way to identify
+complex magnetic orderings and their origins from the charge modulations.",2108.04997v2
+2022-11-18,Acceptor-based qubit in silicon with tunable strain,"Long coherence time and compatibility with semiconductor fabrication make
+spin qubits in silicon an attractive platform for quantum computing. In recent
+years, hole spin qubits are being developed as they have the advantages of weak
+coupling to nuclear spin noise and strong spin-orbit coupling (SOC), in
+constructing high-fidelity quantum gates. However, there are relatively few
+studies on the hole spin qubits in a single acceptor, which requires only low
+density of the metallic gates. In particular, the investigation of flexible
+tunability using controllable strain for fault-tolerant quantum gates of
+acceptor-based qubits is still lacking. Here, we study the tunability of
+electric dipole spin resonance (EDSR) of acceptor-based hole spin qubits with
+controllable strain. The flexible tunability of LH-HH splitting and spin-hole
+coupling (SHC) with the two kinds of strain can avoid high electric field at
+the ""sweet spot"", and the operation performance of the acceptor qubits could be
+optimized. Longer relaxation time or stronger EDSR coupling at low electric
+field can be obtained. Moreover, with asymmetric strain, two ""sweet spots"" are
+induced and may merge together, and form a second-order ""sweet spot"". As a
+result, the quality factor $Q$ can reach $10^{4}$ for single-qubit operation,
+with high tolerance for the electric field variation. Furthermore, the
+two-qubit operation of acceptor qubits based on dipole-dipole interaction is
+discussed for high-fidelity two-qubit gates. The tunability of spin qubit
+properties in acceptor via strain could provide promising routes for spin-based
+quantum computing.",2211.10019v1
+2019-08-25,Electric field manipulation enhanced by strong spin-orbit coupling: promoting rare-earth ions as qubits,"Quantum information processing based on magnetic ions are considered
+potential candidates for applications because they can be modified and scaled
+up by a variety of chemical methods. For these systems to achieve individual
+spin addressability and high energy efficiency, we exploited the electric field
+as a tool to manipulate their quantum behaviours, functioning via spin-orbit
+coupling. A Ce:YAG single crystal was employed due to that rare-earth ions have
+strong spin-orbit coupling and with considerations regarding the dynamics and
+the symmetry requirements. The Stark effect of the Ce3+ ion was observed and
+measured. When demonstrated as a quantum phase gate, the electric field
+manipulation exhibited high efficiency which allowed up to 57 {\pi}/2
+operations before decoherence with optimized field directions. It was also
+utilized to carry out quantum bang-bang control, as a method of dynamic
+decoupling, and the refined Deutsch-Jozsa algorithm. Our experiments
+highlighted rare-earth ions as potentially applicable qubits since they offer
+enhanced spin-electric coupling which enables high-efficiency quantum
+manipulation.",1908.09274v2
+2013-06-17,Energy spectra of three electrons in SiGe/Si/SiGe laterally coupled triple quantum dots,"We investigate the energy spectra of three electrons in SiGe/Si/SiGe
+equilateral triangular and symmetric linear triple quantum dots in the presence
+of magnetic (in either Faraday or Voigt configuration) and electric fields with
+single valley approximation by using the real-space configuration interaction
+method. The strong electron-electron Coulomb interaction, which is crucial to
+the energy spectra, is explicitly calculated whereas the weak spin-orbit
+coupling is treated perturbatively. In both equilateral triangular and
+symmetric linear triple quantum dots, we find doublet-quartet transition of
+ground-state spin configuration by varying dot size or interdot distance in the
+absence of external fields. This transition has not been reported in the
+literature on triple quantum dots. In the magnetic-field (Faraday
+configuration) dependence of energy spectra, we find anticrossings with large
+energy splittings between the energy levels with the same spin state in the
+absence of the spin-orbit coupling. This anticrossing behavior originates from
+the triple quantum dot confinement potential. In addition, with the inclusion
+of the spin-orbit coupling, we find that all the intersections shown in the
+equilateral triangular case become anticrossing whereas only part of the
+intersections in symmetric linear case show anticrossing behavior in the
+presence of magnetic field in either the Faraday or Voigt configuration. All
+the anticrossing behaviors are analyzed based on symmetry consideration.
+Moreover, we show that the electric field can effectively influence the energy
+levels and the charge configurations.",1306.3719v1
+2013-10-07,Tunable Landau-Zener transitions in a spin-orbit coupled Bose-Einstein condensate,"The Landau-Zener (LZ) transition is one of the most fundamental phenomena in
+quantum dynamics. It describes nonadiabatic transitions between quantum states
+near an avoided crossing that can occur in diverse physical systems. Here we
+report experimental measurements and tuning of LZ transitions between the
+dressed eigenlevels of a Bose-Einstein condensate (BEC) that is synthetically
+spin-orbit (SO) coupled. We measure the transition probability as the BEC is
+accelerated through the SO avoided crossing and study its dependence on the
+coupling between the diabatic (bare) states, eigenlevel slope, and eigenstate
+velocity--the three parameters of the LZ model that are independently
+controlled in our experiments. Furthermore, we performed time-resolved
+measurements to demonstrate the breaking down of the spin-momentum locking of
+the spin-orbit-coupled BEC in the nonadiabatic regime, and we determined the
+diabatic switching time of the LZ transitions. Our observations show
+quantitative agreement with the LZ model and numerical simulations of the
+quantum dynamics in the quasimomentum space. The tunable LZ transition may be
+exploited to enable a spin-dependent atomtronic transistor.",1310.1818v2
+2015-02-28,Symmetry protected skyrmions in 3D spin-orbit coupled Bose gases,"We present a variational study of pseudo-spin $1/2$ Bose gases in a harmonic
+trap with weak 3D spin-orbit coupling of $\bmsigma\cdot\mathbf{p}$ type. This
+spin-orbit coupling mixes states with different parities, which inspires us to
+approximate the single particle state with the eigenstates of the total angular
+momentum, i.e. superposition of harmonic $s$-wave and $p$-wave states. As the
+time reversal symmetry is protected by two-body interaction, we set the
+variational order parameter as the combination of two mutually time reversal
+symmetric eigenstates of the total angular momentum. The variational results
+essentially reproduce the 3D skyrmion-like ground state recently identified by
+Kawakami {\it et al.}. We show that these skyrmion-like ground states emerging
+in this model are primarily caused by $p$ wave spatial mode involving in the
+variational order parameter that drives two spin components spatially
+separated. We find the ground state of this system falls into two phases with
+different density distribution symmetries depending on the relative magnitude
+of intraspecies and interspecies interaction: Phase I has parity symmetric and
+axisymmetric density distributions, while Phase II is featured with special
+joint symmetries of discrete rotational and time reversal symmetry. With the
+increasing interaction strength the transition occurs between two phases with
+distinct density distributions, while the topological 3D skyrmion-like spin
+texture is symmetry protected.",1503.00128v1
+2016-01-16,Gauge Covariance and Spin Current Conservation in the Gauge Field Formulation of Systems with Spin-Orbit Coupling,"The question of gauge-covariance in the non-Abelian gauge-field formulation
+of two space-dimensional systems with spin-orbit coupling relevant to
+spintronics is investigated. Although, these are generally gauge-fixed models,
+it is found that for the class of gauge fields that are space-time independent
+and satisfy a U(1) algebra, thus having a vanishing field strength, there is a
+residual gauge freedom in the Hamiltonian. The gauge transformations assume the
+form of a space-dependent rotation of the transformed wave functions with
+rotation angles and axes determined by the specific form of the gauge-field,
+i.e., the spin-orbit coupling. The fields can be gauged away, reducing the
+Hamiltonian to one which is isospectral to the free-particle Hamiltonian, and
+giving rise to the phenomenon of persistent spin helix reported first by
+B.~A.~Bernevig \emph{et al.} [Phys.~Rev.~Lett. \textbf{97}, 236601 (2006)]. The
+investigation of the global gauge transformations leads to the derivation of a
+continuity equation where the component of the spin-density along given
+directions, again fixed by the specific form of the gauge field, is conserved.",1601.04158v1
+2017-03-04,Vortex states and spin textures of rotating spin-orbit-coupled Bose-Einstein condensates in a toroidal trap,"We consider the ground-state properties of Rashba spin-orbit-coupled
+pseudo-spin-1/2 Bose-Einstein condensates (BECs) in a rotating two-dimensional
+(2D) toroidal trap. In the absence of spin-orbit coupling (SOC), the increasing
+rotation frequency enhances the creation of giant vortices for the initially
+miscible BECs, while it can lead to the formation of semiring density patterns
+with irregular hidden vortex structures for the initially immiscible BECs.
+Without rotation, strong 2D isotropic SOC yields a heliciform-stripe phase for
+the initially immiscible BECs. Combined effects of rotation, SOC, and
+interatomic interactions on the vortex structures and typical spin textures of
+the ground state of the system are discussed systematically. In particular, for
+fixed rotation frequency above the critical value, the increasing isotropic SOC
+favors a visible vortex ring in each component which is accompanied by a hidden
+giant vortex plus a (several) hidden vortex ring(s) in the central region. In
+the case of 1D anisotropic SOC, large SOC strength results in the generation of
+hidden linear vortex string and the transition from initial phase separation
+(phase mixing) to phase mixing (phase separation). Furthermore, the peculiar
+spin textures including skyrmion lattice, skyrmion pair and skyrmion string are
+revealed in this system.",1703.01411v1
+2011-11-18,Locally Non-centrosymmetric Superconductivity in Multilayer Systems,"Although multilayer systems possess global inversion symmetry, some of the
+layers lack local inversion symmetry because no global inversion centers are
+present on such layers. Such locally non-centrosymmetric systems exhibit
+spatially modulated Rashba spin-orbit coupling. In this study, the
+superconductivity in multilayer models exhibiting inhomogeneous Rashba
+spin-orbit coupling is investigated. We study the electronic structure,
+superconducting gap, and spin susceptibility in the superconducting state with
+mixed parity order parameters. We show the enhancement of the spin
+susceptibility by Rashba spin-orbit coupling and interpret it on the basis of
+the crossover from a centrosymmetric superconductor to a non-centrosymmetric
+superconductor. It is also shown that the spin susceptibility is determined by
+the phase difference of the order parameter between layers and is nearly
+independent of the parity mixing of order parameters. An intuitive
+understanding is given on the basis of the analytic expression of
+superconducting order parameters in the band basis. The results indicate that
+not only a broken global inversion symmetry but also a broken local inversion
+symmetry leads to unique properties of superconductivity. We discuss the
+superconductivity in artificial superlattices involving CeCoIn5 and multilayer
+high-Tc cuprates.",1111.4293v2
+2017-06-20,Symmetry-enriched Bose-Einstein condensates in spin-orbit coupled bilayer system,"We consider the fate of Bose-Einstein condensation (BEC) with time-reversal
+symmetry and inversion symmetry in a spin-orbit coupled bilayer system. When
+these two symmetry operators commute, all the single particle bands are exactly
+two-fold degenerate in the momentum space. The scattering in the two-fold
+degenerate rings can relax the spin-momentum locking effect resulting from
+spin-orbit coupling, thus we can realize the spin polarized plane wave phase
+even when the inter-particle interaction dominates. When these two operators
+anti-commute, the lowest two bands may have the same minimal energy, which have
+totally different spin structures. As a result, the competition between
+different condensates in these two energetically degenerate rings can give rise
+to interesting stripe phases with atoms condensed at two or four colinear
+momenta. We find that the crossover between these two cases is accompanied by
+the excited band condensation when the interference energy can overcome the
+increased single particle energy in the excited band. This effect is not based
+on strong interaction, thus can be realized even with moderate interaction
+strength.",1706.06234v1
+2018-01-03,Discovery of highly spin-polarized conducting surface states in the strong spin-orbit coupling semiconductor Sb$_2$Se$_3$,"Majority of the A$_2$B$_3$ type chalcogenide systems with strong spin-orbit
+coupling, like Bi$_2$Se$_3$, Bi$_2$Te$_3$ and Sb$_2$Te$_3$ etc., are
+topological insulators. One important exception is Sb$_2$Se$_3$, where a
+topological non-trivial phase was argued to be possible under ambient
+conditions, but such a phase could be detected to exist only under pressure. In
+this Letter, we show that like Bi$_2$Se$_3$, Sb$_2$Se$_3$, displays generation
+of highly spin-polarized current under mesoscopic superconducting point
+contacts as measured by point contact Andreev reflection spectroscopy. In
+addition, we observe a large negative and anisotropic magnetoresistance in
+Sb$_2$Se$_3$, when the field is rotated in the basal plane. However, unlike in
+Bi$_2$Se$_3$, in case of Sb$_2$Se$_3$ a prominent quasiparticle interference
+(QPI) pattern around the defects could be obtained in STM conductance imaging.
+Thus, our experiments indicate that Sb$_2$Se$_3$ is a regular band insulator
+under ambient conditions, but due to it's high spin-orbit coupling, non-trivial
+spin-texture exists on the surface and the system could be on the verge of a
+topological insulator phase.",1801.00929v1
+2019-04-18,Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers. II. Canted magnetization,"It has been suggested by theoretical works that equal spin-triplet Cooper
+pairs can be generated in Josephson junctions containing both a ferromagnet and
+a source of spin-orbit coupling. Our recent experimental work suggested that
+spin-triplet Cooper pairs were not generated by a Pt spin-orbit coupling layer
+when the ferromagnetic weak link had entirely in-plane anisotropy (N. Satchell
+and N.O. Birge, Phys. Rev. B 97, 214509 (2018)). Here, we revisit the
+experiment using Pt again as a source for spin-orbit coupling and a [Co(0.4
+nm)/Ni(0.4 nm)]$_{\times8}$/Co(0.4 nm) ferromagnetic weak link with both
+in-plane and out-of-plane magnetization components (canted magnetization). The
+canted magnetization more closely matches theoretical predictions than our
+previous experimental work. Our results suggest that there is no supercurrent
+contribution in our junctions from equal spin-triplets. In addition, this work
+includes the first systematic study of supercurrent dependence on Cu interlayer
+thickness, a common additional layer used to buffer the growth of the
+ferromagnet and which for Co may significantly improve the growth morphology.
+We report that the supercurrent in the [Co(0.4 nm)/Ni(0.4
+nm)]$_{\times8}$/Co(0.4 nm) ferromagnetic weak links can be enhanced by over
+two orders of magnitude by tuning the Cu interlayer thickness. This result has
+important application in superconducting spintronics, where large critical
+currents are desirable for devices.",1904.08798v2
+2021-02-08,Generating and detecting topological phases with higher Chern number,"Topological phases with broken time-reversal symmetry and Chern number |C|>=2
+are of fundamental interest, but it remains unclear how to engineer the desired
+topological Hamiltonian within the paradigm of spin-orbit-coupled particles
+hopping only between nearest neighbours of a static lattice. We show that
+phases with higher Chern number arise when the spin-orbit coupling satisfies a
+combination of spin and spatial rotation symmetries. We leverage this result
+both to construct minimal two-band tight binding Hamiltonians that exhibit
+|C|=2,3 phases, and to show that the Chern number of one of the energy bands
+can be inferred from the particle spin polarization at the high-symmetry
+crystal momenta in the Brillouin zone. Using these insights, we provide a
+detailed experimental scheme for the specific realization of a
+time-reversal-breaking topological phase with |C|=2 for ultracold atomic gases
+on a triangular lattice subject to spin-orbit coupling. The Chern number can be
+directly measured using Zeeman spectroscopy; for fermions the spin amplitudes
+can be measured directly via time of flight, while for bosons this is preceded
+by a short Bloch oscillation. Our results provide a pathway to the realization
+and detection of novel topological phases with higher Chern number in ultracold
+atomic gases.",2102.04468v2
+2022-01-04,Gain/loss effects on spin-orbit coupled ultracold atoms in two-dimensional optical lattices,"Due to the fundamental position of spin-orbit coupled ultracold atoms in the
+simulation of topological insulators, the gain/loss effects on these systems
+should be evaluated when considering the measurement or the coupling to the
+environment. Here, incorporating the mature gain/loss techniques into the
+experimentally realized spin-orbit coupled ultracold atoms in two-dimensional
+optical lattices, we investigate the corresponding non-Hermitian tight-binding
+model and evaluate the gain/loss effects on various properties of the system,
+revealing the interplay of the non-Hermiticity and the spin-orbit coupling.
+Under periodic boundary conditions, we analytically obtain the topological
+phase diagram, which undergoes a non-Hermitian gapless interval instead of a
+point that the Hermitian counterpart encounters for a topological phase
+transition. We also unveil that the band inversion is just a necessary but not
+sufficient condition for a topological phase in two-level spin-orbit coupled
+non-Hermitian systems. Because the nodal loops of the upper or lower two
+dressed bands of the Hermitian counterpart can be split into exceptional loops
+in this non-Hermitian model, a gauge-independent Wilson-loop method is
+developed for numerically calculating the Chern number of multiple degenerate
+complex bands. Under open boundary conditions, we find that the conventional
+bulk-boundary correspondence does not break down with only on-site gain/loss
+due to the lack of non-Hermitian skin effect, but the dissipation of chiral
+edge states depends on the boundary selection, which may be used in the control
+of edge-state dynamics. Given the technical accessibility of state-dependent
+atom loss, this model could be realized in current cold-atom experiments.",2201.01216v3
+2015-05-05,Spin-orbit coupling and operation of multi-valley spin qubits,"Spin qubits composed of either one or three electrons are realized in a
+quantum dot formed at a Si/SiO_2-interface in isotopically enriched silicon.
+Using pulsed electron spin resonance, we perform coherent control of both types
+of qubits, addressing them via an electric field dependent g-factor. We perform
+randomized benchmarking and find that both qubits can be operated with high
+fidelity. Surprisingly, we find that the g-factors of the one-electron and
+three-electron qubits have an approximately linear but opposite dependence as a
+function of the applied dc electric field. We develop a theory to explain this
+g-factor behavior based on the spin-valley coupling that results from the sharp
+interface. The outer ""shell"" electron in the three-electron qubit exists in the
+higher of the two available conduction-band valley states, in contrast with the
+one-electron case, where the electron is in the lower valley. We formulate a
+modified effective mass theory and propose that inter-valley spin-flip
+tunneling dominates over intra-valley spin-flips in this system, leading to a
+direct correlation between the spin-orbit coupling parameters and the g-factors
+in the two valleys. In addition to offering all-electrical tuning for
+single-qubit gates, the g-factor physics revealed here for one-electron and
+three-electron qubits offers potential opportunities for new qubit control
+approaches.",1505.01213v1
+2020-06-30,Spin-orbit coupling suppression and singlet-state blocking of spin-triplet Cooper pairs,"An inhomogeneous magnetic exchange field at a superconductor/ferromagnet
+interface converts spin-singlet Cooper pairs to a spin-aligned (i.e.
+spin-polarized) triplet state. Although the decay envelope of such triplet
+pairs within ferromagnetic materials is well studied, little is known about
+their decay in non-magnetic metals and superconductors, and in particular in
+the presence of spin-orbit coupling (SOC). Here we investigate devices in which
+triplet supercurrents are injected into the s-wave superconductor Nb. In the
+normal state of Nb, triplet supercurrents decay over a distance of 5 nm, which
+is an order of magnitude smaller than the decay of spin singlet pairs due to
+the SOC interacting with the spin associated with triplet pairs. In the
+superconducting state of Nb, triplet supercurrents are not able to couple with
+the singlet wavefunction and thus blocked by the absence of available
+equilibrium states in the singlet gap. The results offer new insight into the
+dynamics between s-wave singlet and s-wave triplet states.",2006.16654v3
+2022-05-24,Competing spin-orbital singlet states in the 4$d^4$ honeycomb ruthenate Ag$_3$LiRu$_2$O$_6$,"When spin-orbit-entangled $d$-electrons reside on a honeycomb lattice, rich
+quantum states are anticipated to emerge, as exemplified by the $d^5$ Kitaev
+materials. Distinct yet equally intriguing physics may be realized with a
+$d$-electron count other than $d^5$. We found that the layered ruthenate
+Ag$_3$LiRu$_2$O$_6$ with $d^4$ Ru$^{4+}$ ions at ambient pressure forms a
+honeycomb lattice of spin-orbit-entangled singlets, which is a playground for
+frustrated excitonic magnetism. Under pressure, the singlet state does not
+develop the expected excitonic magnetism but experiences two successive
+transitions to other nonmagnetic phases, first to an intermediate phase with
+moderate distortion of honeycomb lattice, and eventually to a high-pressure
+phase with very short Ru-Ru dimer bonds. While the strong dimerization in the
+high-pressure phase originates from a molecular orbital formation as in the
+sister compound Li$_2$RuO$_3$, the intermediate phase represents a
+spin-orbit-coupled $J$-dimer state which is stabilized by the admixture of
+upper-lying $J_{\rm eff} = 1$-derived states. We argue that the $J$-dimer state
+is induced by a pseudo-Jahn-Teller effect associated with the low-lying
+spin-orbital excited states and is unique to spin-orbit-entangled $d^4$
+systems. The discovery of competing singlet phases demonstrates rich
+spin-orbital physics of $d^4$ honeycomb compounds and paves the way for
+realization of unconventional magnetism.",2205.12123v1
+2019-09-11,Discovering momentum-dependent magnon spin texture in insulating antiferromagnets: Role of the Kitaev interaction,"We theoretically show that the Kitaev interaction generates a novel class of
+spin texture in the excitation spectrum of the antiferromagnetic insulator
+found in the Kitaev-Heisenberg-$\Gamma$ model. In conducting electronic
+systems, there is a series of vortex type of spin texture along the Fermi
+surface induced by Rashba and Dresselhaus spin-orbit coupling. Such spin
+textures are rarely found in magnetic insulators, since there had been no
+systematic ways to control the kinetics of its quasi-particle called magnon
+using a magnetic field or spacially asymmetric exchange couplings. Here, we
+propose a general framework to explore such spin textures in arbitrary
+insulating antiferromagnets. We introduce an analytical method to transform any
+complicated Hamiltonian to the simple representation based on pseudo-spin
+degrees of freedom. The direction of the pseudo-spin on a Bloch sphere
+describes the degree of contributions from the two magnetic sublattices to the
+spin moment carried by the magnon. The momentum dependent fictitious ""Zeeman
+field"" determines the direction of the pseudo-spin and thus becomes the control
+parameter of the spin texture, which is explicitly described by the original
+model parameters. The framework enabled us to clarify the uncovered aspect of
+the Kitaev interaction, and further provides a tool to easily design or explore
+materials with intriguing magnetic properties. Since these spin textures can be
+a source of a pure spin current, the Kitaev materials $A_{2}$PrO$_{3}$ ($A$
+=Li, Na) shall become a potential platform of power-saving spintronics devices.",1909.05174v2
+2016-10-28,Longitudinal optical and spin-Hall conductivities of Rashba conducting strips coupled to ferro- and antiferromagnetic layers,"A system composed of a conducting planar strip with Rashba spin-orbit
+coupling (RSOC), magnetically coupled to a layer of localized magnetic moments,
+at equilibrium, is studied within a microscopic Hamiltonian with numerical
+techniques at zero temperature in the clean limit. In particular, transport
+properties for the cases of ferromagnetic (FM) and antiferromagnetic (AFM)
+coupled layers are computed in linear response on strips of varying width. Some
+behaviors observed for these properties are consistent with the ones observed
+for the corresponding Rashba helical currents. The case of uncoupled Rashba
+strips is also studied for comparison. In the case of Rashba strips coupled to
+an AFM localized order, results for the longitudinal dc conductivity, for small
+strip widths, suggest the proximity to a metal-insulator transition. More
+interesting, in the proximity of this transition, and in general at
+intermediate values of the RSOC, it is observed a large spin-Hall conductivity
+that is two orders of magnitude larger than the one for the FM order for the
+same values of the RSOC and strip widths. There are clearly two different
+regimes for small and for large RSOC, which is also present in the behavior of
+Rashba helical currents. Different contributions to the optical and the
+spin-Hall conductivities, according to a new classification of inter- or
+intra-band origin proposed for planar strips in the clean limit, or coming from
+the hopping or spin-orbit terms of the Hamiltonian, are examined. Finally, the
+effects of different orientation of the coupled magnetic moments will be also
+studied.",1610.09399v2
+2011-11-03,Energy spectra of three electrons in Si/SiGe single and vertically coupled double quantum dots,"We study three-electron energy spectra in Si/SiGe single and vertically
+coupled double quantum dots where all the relevant effects, such as, the Zeeman
+splitting, spin-orbit coupling, valley coupling and electron-electron Coulomb
+interaction are explicitly included. In the absence of magnetic field, our
+results in single quantum dots agree well with the experiment by Borselli {\em
+et al.} [Appl. Phys. Lett. {\bf 98}, 123118 (2011)]. We identify the spin and
+valley configurations of the ground state in the experimental cases and give a
+complete phase-diagram-like picture of the ground state configuration with
+respect to the dot size and valley splitting. We also explicitly investigate
+the three-electron energy spectra of the pure and mixed valley configurations
+with magnetic fields in both Faraday and Voigt configurations. We find that the
+ground state can be switched between doublet and quartet by tuning the magnetic
+field and/or dot size. The three-electron energy spectra present many
+anticrossing points between different spin states due to the spin-orbit
+coupling, which are expected to benefit the spin manipulation. We show that the
+negligibly small intervalley Coulomb interaction can result in magnetic-field
+independent quartet-doublet degeneracy in the three-electron energy spectrum of
+the mixed valley configuration. Furthermore, we study the barrier-width and
+barrier-height dependences in vertically coupled double quantum dots with both
+pure and mixed valley configurations. Similar to the single quantum dot case,
+anticrossing behavior and quartet-doublet degeneracy are observed.",1111.0717v1
+2001-11-15,Resonant X-ray Scattering in Manganites - Study of Orbital Degree of Freedom -,"Orbital degree of freedom of electrons and its interplay with spin, charge
+and lattice degrees of freedom are one of the central issues in colossal
+magnetoresistive manganites. The orbital degree of freedom has until recently
+remained hidden, since it does not couple directly to most of experimental
+probes. Development of synchrotron light sources has changed the situation; by
+the resonant x-ray scattering (RXS) technique the orbital ordering has
+successfully been observed . In this article, we review progress in the recent
+studies of RXS in manganites. We start with a detailed review of the RXS
+experiments applied to the orbital ordered manganites and other correlated
+electron systems. We derive the scattering cross section of RXS where the
+tensor character of the atomic scattering factor (ASF) with respect to the
+x-ray polarization is stressed. Microscopic mechanisms of the anisotropic
+tensor character of ASF is introduced and numerical results of ASF and the
+scattering intensity are presented. The azimuthal angle scan is a unique
+experimental method to identify RXS from the orbital degree of freedom. A
+theory of the azimuthal angle and polarization dependence of the RXS intensity
+is presented. The theoretical results show good agreement with the experiments
+in manganites. Apart from the microscopic description of ASF, a theoretical
+framework of RXS to relate directly to the 3d orbital is presented. The
+scattering cross section is represented by the correlation function of the
+pseudo-spin operator for the orbital degree of freedom. A theory is extended to
+the resonant inelastic x-ray scattering and methods to observe excitations of
+the orbital degree of freedom are proposed.",0111269v1
+2014-04-10,Two-body gravitational spin-orbit interaction at linear order in the mass ratio,"We analytically compute, to linear order in the mass-ratio, the ""geodetic""
+spin precession frequency of a small spinning body orbiting a large
+(non-spinning) body to the eight-and-a-half post-Newtonian order, thereby
+extending previous analytical knowledge which was limited to the third
+post-Newtonian level. These results are obtained applying analytical
+gravitational self-force theory to the first-derivative level generalization of
+Detweiler's gauge-invariant redshift variable. We compare our analytic results
+with strong-field numerical data recently obtained by S.~R.~Dolan et al.
+[Phys.\ Rev.\ D {\bf 89}, 064011 (2014)]. Our new, high-post-Newtonian-order
+results capture the strong-field features exhibited by the numerical data. We
+argue that the spin-precession will diverge as $\approx -0.14/(1-3y)$ as the
+light-ring is approached. We transcribe our kinematical spin-precession results
+into a corresponding improved analytic knowledge of one of the two
+(gauge-invariant) effective gyro-gravitomagnetic ratios characterizing
+spin-orbit couplings within the effective-one-body formalism. We provide
+simple, accurate analytic fits both for spin-precession and the effective
+gyro-gravitomagnetic ratio. The latter fit predicts that the
+linear-in-mass-ratio correction to the gyro-gravitomagnetic ratio changes sign
+before reaching the light-ring. This strong-field prediction might be important
+for improving the analytic modeling of coalescing spinning binaries.",1404.2747v1
+2019-03-04,Rashba spin-splitting in ferroelectric oxides: from rationalizing to engineering,"Ferroelectric Rashba semiconductors (FERSC), in which Rashba spin-splitting
+can be controlled and reversed by an electric field, have recently emerged as a
+new class of functional materials useful for spintronic applications. The
+development of concrete devices based on such materials is, however, still
+hampered by the lack of robust FERSC compounds. Here, we show that the
+coexistence of large spontaneous polarisation and sizeable spin-orbit coupling
+is not sufficient to have strong Rashba effects and clarify why simple
+ferroelectric oxide perovskites with transition metal at the B-site are
+typically not suitable FERSC candidates. By rationalizing how this limitation
+can be by-passed through band engineering of the electronic structure in
+layered perovskites, we identify the Bi$_2$WO$_6$ Aurivillius crystal as the
+first robust ferroelectric with large and reversible Rashba spin-splitting,
+that can even be substantially doped without losing its ferroelectric
+properties. Importantly, we highlight that a unidirectional spin-orbit field
+arises in layered Bi$_2$WO$_6$, resulting in a protection against
+spin-decoherence.We highlight moreover that a unidirectional spin-orbit field
+arises in Bi$_2$WO$_6$, in which the spin-texture is so protected against
+spin-decoherence.",1903.01241v3
+2019-03-14,Band Structure and Spin-Orbital Texture of the (111)-KTaO3 Two-Dimensional Electron Gas,"Two-dimensional electron gases (2DEGs) in oxides show great potential for
+discovering new physical phenomena and at the same time hold promise for
+electronic applications. In this work we use angle resolved photoemission to
+determine the electronic structure of a 2DEG stabilized in the (111)-oriented
+surface of the strong spin orbit coupling material KTaO3. Our measurements
+reveal multiple sub-bands that emerge as a consequence of quantum confinement
+and form a six-fold symmetric Fermi surface. This electronic structure is well
+reproduced by self-consistent tight-binding supercell calculations. Based on
+these calculations we determine the spin and orbital texture of the 2DEG. We
+show that the 2DEG Fermi surface is derived from bulk J = 3/2 states and
+exhibits an unconventional anisotropic Rashba-like lifting of the
+spin-degeneracy. Spin-momentum locking holds only for high symmetry directions
+and a strong out-of-plane spin component renders the spin-texture three-fold
+symmetric. We find that the average spin-splitting on the Fermi surface is an
+order of magnitude larger than in SrTiO3, which should translate into an
+enhancement in the spin-orbitronic response of (111)-KTaO3 2DEG based devices.",1903.06077v1
+2021-10-05,Spin-orbit torque generation in NiFe/IrO2 bilayers,"The 5d transition-metal oxides have a unique electronic structure dominated
+by strong spin-orbit coupling and hence they can be an intriguing platform to
+explore spin-current physics. Here, we report on room-temperature generation of
+spin-orbit torque (SOT) from a conductive 5d iridium oxide, IrO2. By measuring
+second-harmonic Hall resistance of Ni81Fe19/IrO2 bilayers, we find both
+dampinglike and fieldlike SOTs. The former is larger than the latter, enabling
+easier control of magnetization. We also observe that the dampinglike SOT
+efficiency has a significant dependence on IrO2 thickness, which is well
+described by the drift-diffusion model based on the bulk spin Hall effect. We
+deduce the effective spin Hall angle of +0.093 +- 0.003 and the spin-diffusion
+length of 1.7 +- 0.2 nm. By comparison with control samples Pt and Ir, we show
+that the effective spin Hall angle of IrO2 is comparable to that of Pt and
+seven times higher than that of Ir. The fieldlike SOT efficiency has a negative
+sign without appreciable dependence on the thickness, in contrast to the
+dampinglike SOT. This suggests that the fieldlike SOT likely stems from the
+interface. These experimental findings suggest that the uniqueness of the
+electronic structure of 5d transition-metal oxides is crucial for highly
+efficient charge to spin-current conversion.",2110.01801v1
+2023-11-03,Magnetic properties and spin dynamics in a spin-orbit driven Jeff= 1/2 triangular lattice antiferromagnet,"Frustration-induced strong quantum fluctuations accompanied by spin-orbit
+coupling and crystal electric field can give rise to rich and diverse magnetic
+phenomena associated with unconventional low-energy excitations in rare-earth
+based quantum magnets. Herein, we present crystal structure, magnetic
+susceptibility, specific heat, muon spin relaxation(muSR), and electron spin
+resonance (ESR) studies on the polycrystalline samples of Ba6Yb2Ti4O17 in which
+Yb3+ ions constitute a perfect triangular lattice in ab-plane without
+detectable anti-site disorder between atomic sites. The Curie-Weiss fit of
+low-temperature magnetic susceptibility data suggest the spin-orbit entangled
+Jeff = 1/2 degrees of freedom of Yb3+ spin with weak antiferromagnetic exchange
+interactions in the Kramers doublet ground state. The zero-field specific heat
+data reveal the presence of long-range magnetic order at TN = 77 mK which is
+suppressed in a magnetic field 1 T. The broad maximum in specific heat is
+attributed to the Schottky anomaly implying the Zeeman splitting of the Kramers
+doublet ground state. The ESR measurements suggest the presence of anisotropic
+exchange interaction between the moments of Yb3+ spins and the well separated
+Kramers doublet state. muSR experiments reveal a fluctuating state of Yb3+
+spins in the temperature range 0.1 K-100 K owing to depopulation of crystal
+electric field levels, which suggests that the Kramers doublets are well
+separated consistent with thermodynamic and ESR results. In addition to the
+intraplane nearest-neighbor superexchange interaction, the interplane exchange
+interaction and anisotropy are expected to stabilize the long-range ordered
+state in this triangular lattice antiferromagnet.",2311.01858v1
+2021-12-01,Libration-induced Orbit Period Variations Following the DART Impact,"The Double Asteroid Redirection Test (DART) mission will be the first test of
+a kinetic impactor as a means of planetary defense. In late 2022, DART will
+collide with Dimorphos, the secondary in the Didymos binary asteroid system.
+The impact will cause a momentum transfer from the spacecraft to the binary
+asteroid, changing the orbit period of Dimorphos and forcing it to librate in
+its orbit. Owing to the coupled dynamics in binary asteroid systems, the orbit
+and libration state of Dimorphos are intertwined. Thus, as the secondary
+librates, it also experiences fluctuations in its orbit period. These
+variations in the orbit period are dependent on the magnitude of the impact
+perturbation, as well as the system's state at impact and the moments of
+inertia of the secondary. In general, any binary asteroid system whose
+secondary is librating will have a non-constant orbit period on account of the
+secondary's fluctuating spin rate. The orbit period variations are typically
+driven by two modes: a long-period and short-period, each with significant
+amplitudes on the order of tens of seconds to several minutes. The fluctuating
+orbit period offers both a challenge and an opportunity in the context of the
+DART mission. Orbit period oscillations will make determining the post-impact
+orbit period more difficult, but can also provide information about the
+system's libration state and the DART impact.",2112.00634v1
+2024-03-16,Coherent Acoustic Control of Defect Orbital States in the Strong-Driving Limit,"We use a bulk acoustic wave resonator to demonstrate coherent control of the
+excited orbital states in a diamond nitrogen-vacancy (NV) center at cryogenic
+temperature. Coherent quantum control is an essential tool for understanding
+and mitigating decoherence. Moreover, characterizing and controlling orbital
+states is a central challenge for quantum networking, where optical coherence
+is tied to orbital coherence. We study resonant multi-phonon orbital Rabi
+oscillations in both the frequency and time domain, extracting the strength of
+the orbital-phonon interactions and the coherence of the acoustically driven
+orbital states. We reach the strong-driving limit, where the physics is
+dominated by the coupling induced by the acoustic waves. We find agreement
+between our measurements, quantum master equation simulations, and a
+Landau-Zener transition model in the strong-driving limit. Using perturbation
+theory, we derive an expression for the orbital Rabi frequency versus acoustic
+drive strength that is non-perturbative in the drive strength and agrees well
+with our measurements for all acoustic powers. Motivated by continuous wave
+spin resonance-based decoherence protection schemes, we model the orbital
+decoherence and find good agreement between our model and our measured
+few-to-several nanoseconds orbital decoherence times. We discuss the outlook
+for orbital decoherence protection.",2403.10989v1
+2004-11-29,Quantum Spin Hall Effect in Graphene,"We study the effects of spin orbit interactions on the low energy electronic
+structure of a single plane of graphene. We find that in an experimentally
+accessible low temperature regime the symmetry allowed spin orbit potential
+converts graphene from an ideal two dimensional semimetallic state to a quantum
+spin Hall insulator. This novel electronic state of matter is gapped in the
+bulk and supports the quantized transport of spin and charge in gapless edge
+states that propagate at the sample boundaries. The edge states are non chiral,
+but they are insensitive to disorder because their directionality is correlated
+with spin. The spin and charge conductances in these edge states are calculated
+and the effects of temperature, chemical potential, Rashba coupling, disorder
+and symmetry breaking fields are discussed.",0411737v2
+2006-01-12,Observation of Spin Relaxation Anisotropy in Semiconductor Quantum Wells,"Spin relaxation of two-dimensional electrons in asymmetrical (001) AlGaAs
+quantum wells are measured by means of Hanle effect. Three different spin
+relaxation times for spins oriented along [110], [1-10] and [001]
+crystallographic directions are extracted demonstrating anisotropy of
+D'yakonov-Perel' spin relaxation mechanism. The relative strengths of Rashba
+and Dresselhaus terms describing the spin-orbit coupling in semiconductor
+quantum well structures. It is shown that the Rashba spin-orbit splitting is
+about four times stronger than the Dresselhaus splitting in the studied
+structure.",0601252v1
+2008-12-31,Spin Hall effect in the kagome lattice with Rashba spin-orbit interaction,"We study the spin Hall effect in the kagom\'{e} lattice with Rashba
+spin-orbit coupling. The conserved spin Hall conductance $\sigma_{xy}^{s}$ (see
+text) and its two components, i.e., the conventional term $\sigma_{xy}^{s0}$
+and the spin-torque-dipole term $\sigma_{xy}^{s\tau}$, are numerically
+calculated, which show a series of plateaus as a function of the electron Fermi
+energy $\epsilon_{F}$. A consistent two-band analysis, as well as a Berry-phase
+interpretation, is also given. We show that these plateaus are a consequence of
+the various Fermi-surface topologies when tuning $\epsilon_{F}$. In particular,
+we predict that compared to the case with the Fermi surface encircling the
+$\mathbf{\Gamma}$ point in the Brillouin zone, the amplitude of the spin Hall
+conductance with the Fermi surface encircling the $\mathbf{K}$ points is twice
+enhanced, which makes it highly meaningful in the future to systematically
+carry out studies of the $\mathbf{K}$-valley spintronics.",0901.0053v1
+2010-11-23,Correlation Effects in Quantum Spin-Hall Insulators: A Quantum Monte Carlo Study,"We consider the Kane-Mele model with spin-orbit coupling supplemented by a
+Hubbard U term. On the basis of projective auxiliary field quantum Monte Carlo
+simulations on lattice sizes up to 15 x 15, we map out the phase diagram. The
+quantum spin-liquid state found in the Hubbard model is shown to be robust
+against weak spin-orbit interaction, and is not adiabatically connected to the
+spin-Hall insulating state. Beyond a critical value of U > U_c both states are
+unstable toward magnetic ordering. Within the quantum spin-Hall state we study
+the spin, charge and single-particle dynamics of the helical Luttinger liquid
+by retaining the Hubbard interaction only on the edge of a ribbon. The Hubbard
+interaction greatly suppresses charge currents along the edge, promotes edge
+magnetism, but leaves the single-particle signatures of the helical liquid
+intact.",1011.5063v3
+2011-12-22,The universal definition of spin current,"The spin current $J_{S}$, orbit angular momentum current $J_{L}$ and total
+angular momentum current $J_{J}$ in a dyad form have been universally defined
+according to quantum electrodynamics. Their conservation quantities and the
+continuity equations have been discussed in different cases. Non-relativistic
+approximation forms are deduced in order to explain their physical meanings,
+and to analyze some experiment results. The spin current of helical edge states
+in HgTe/CdTe quantum wells is calculated to demonstrate the properties of spin
+current on the two dimensional quantum spin-Hall system. A generalized
+spin-orbit coupling term in the semiconductoring media is deduced based on the
+theory of the electrodynamics in the moving media. We recommend to use the
+effective total angular momentum current instead of the pure spin current to
+describe the polarizing distribution and transport phenomena in spintronic
+media.",1112.5320v2
+2012-06-01,Dynamical Self-Quenching of Spin Pumping into Double Quantum Dots,"Nuclear spin polarization can be pumped into spin-blocked quantum dots by
+multiple Landau- Zener passages through singlet-triplet anticrossings. By
+numerical simulations of realistic systems including approximately $10^7$
+nuclear spins during $10^5$ sweeps, we uncover a mechanism of dynamical
+self-quenching which results in a fast saturation of the nuclear polarization
+under stationary pumping. This is caused by screening of the field of the
+nuclear spins. In systems with moderate spin-orbit coupling, self-quenching
+also screens the spin-orbit interaction. The mechanism is generic and remains
+robust under a moderate noise. Our finding explains low polarization levels
+achieved experimentally and calls for developing new protocols that break the
+self-quenching limitations.",1206.0100v3
+2012-07-05,Unconventional Quantum Hall Effect and Tunable Spin Hall Effect in MoS2 Trilayers,"We analyze the Landau level (LL) structure and spin Hall effect in a MoS2
+trilayer. Due to orbital asymmetry, the low-energy Dirac fermions become
+heavily massive and the LL energies grow linearly with $B$, rather than with
+$\sqrt{B}$. Spin-orbital couplings break spin and valley degenerate LL's into
+two time reversal invariant groups, with LL crossing effects present in the
+valence bands. We find a field-dependent unconventional Hall plateau sequence
+$\nu=...$ $-2M-6$, $-2M-4$, $-2M-2$, $-2M-1$, ..., -5, -3, -1, 0, 2, 4 .... In
+a p-n junction, spin-resolved fractionally quantized conductance appears in
+two-terminal measurements with a controllable spin-polarized current that can
+be probed at the interface. We also show the tunability of zero-field spin Hall
+conductivity.",1207.1205v1
+2015-08-06,Interface-driven spin-torque ferromagnetic resonance by Rashba coupling at the interface between non-magnetic materials,"The Rashba-Edelstein effect stems from the interaction between the electron's
+spin and its momentum induced by spin-orbit interaction at an interface or a
+surface. It was shown that the inverse Rashba-Edelstein effect can be used to
+convert a spin- into a charge current. Here, we demonstrate that a Bi/Ag Rashba
+interface can even drive an adjacent ferromagnet to resonance. We employ a
+spin-torque ferromagnetic resonance excitation/detection scheme which was
+developed originally for a bulk spin-orbital effect, the spin Hall effect. In
+our experiment, the direct Rashba-Edelstein effect generates an oscillating
+spin current from an alternating charge current driving the magnetization
+precession in a neighboring permalloy (Py, Ni80Fe20) layer. Electrical
+detection of the magnetization dynamics is achieved by a rectification
+mechanism of the time dependent multilayer resistance arising from the
+anisotropic magnetoresistance.",1508.01410v1
+2016-07-12,Spin Hall conductance in a Y-shaped junction device in presence of tunable spin-orbit coupling,"We study spin Hall effect in a three terminal Y-shaped device in presence of
+tunable spin-orbit (SO) interactions via Landauer-B\""{u}ttiker formalism. We
+have evolved a fabrication technique for creating different angular separation
+between the two arms of the Y-shaped device so as to investigate the effect of
+angular width on the spin Hall conductance (SHC). A smaller angular separation
+yields a larger conductance. Also arbitrary orientation of the spin
+quantization axes yields interesting three dimensional contour maps for the SHC
+corresponding to different angular separation of the Y-shaped device. The
+results explicitly show breaking of the spin rotational symmetry. Further a
+systematic study is carried out to compare and contrast between the different
+SO terms, such as Rashba and Dresselhaus SO interactions and the interplay of
+the angular separation therein.",1607.03352v1
+2016-07-12,Controlling the optical spin Hall effect with light,"The optical spin Hall effect (OSHE) is a transport phenomenon of exciton
+polaritons in semiconductor microcavities, caused by the polaritonic spin-orbit
+interaction, that leads to the formation of spin textures. In the semiconductor
+cavity, the physical basis of the spin orbit coupling is an effective magnetic
+field caused by the splitting of transverse-electric and transverse-magnetic
+(TE-TM) modes. The spin textures can be observed in the near field (local spin
+distribution of polaritons), and as light polarization patterns in the more
+readily observable far field. For future applications in spinoptronic devices,
+a simple and robust control mechanism, which establishes a one-to-one
+correspondence between stationary incident light intensity and far-field
+polarization pattern, is needed. We present such a control scheme, which is
+made possible by a specific double-microcavity design.",1607.03530v1
+2014-03-27,Tight-binding simulations of electrically driven spin-valley transitions in carbon nanotube quantum dots,"We describe dynamics of spin and valley transitions driven by alternating
+electric fields in quantum dots defined electrostatically within semiconducting
+carbon nanotubes (CNT). We use the tight-binding approach to describe the
+states localized within a quantum dot taking into account the circumferential
+spin-orbit interaction due to the s-p hybridization and external fields. The
+basis of eigenstates localized in the quantum dot is used in the solution of
+the time-dependent Schroedinger equation for description of spin flips and
+inter-valley transitions that are driven by periodic perturbation in the
+presence of coupling between the spin, valley and orbital degrees of freedom.
+Besides the first order transitions we find also fractional resonances. We
+discuss the transition rates with selection rules that are lifted by atomic
+disorder and the bend of the tube. We demonstrate that the electric field
+component perpendicular to the axis of the CNT activates spin transitions which
+are otherwise absent and that the resonant spin-flip time scales with the
+inverse of the electric field.",1403.6970v3
+2017-01-23,Unidirectional spin Hall magnetoresistance in topological insulator/ferromagnetic layer heterostructures,"The large spin orbit coupling in topological insulators results in helical
+spin-textured Dirac surface states that are attractive for topological
+spintronics. These states generate an efficient spin-orbit torque on proximal
+magnetic moments at room temperature. However, memory or logic spin devices
+based upon such switching require a non-optimal three terminal geometry, with
+two terminals for the writing current and one for reading the state of the
+device. An alternative two terminal device geometry is now possible by
+exploiting the recent discovery of a unidirectional spin Hall magnetoresistance
+in heavy metal/ferromagnet bilayers and (at low temperature) in magnetically
+doped topological insulator heterostructures. We report the observation of
+unidirectional spin Hall magnetoresistance in a technologically relevant device
+geometry that combines a topological insulator with a conventional
+ferromagnetic metal. Our devices show a figure-of-merit (magnetoresistance per
+current density per total resistance) that is comparable to the highest
+reported values in all-metal Ta/Co bilayers.",1701.06505v1
+2022-02-03,Element Doping Enhanced Charge-to-Spin Conversion Efficiency in Amorphous PtSn4 Dirac Semimetal,"Topological semimetals (TSs) are promising candidates for low-power
+spin-orbit torque (SOT) devices due to their large charge-to-spin conversion
+efficiency. Here, we investigated the charge-to-spin conversion efficiency of
+amorphous PtSn4 (5 nm)/CoFeB (2.5-12.5 nm) layered structures prepared by a
+magnetron sputtering method at room temperature. The charge-to-spin ratio of
+PtSn4/CoFeB bilayers was 0.08, characterized by a spin torque ferromagnetic
+resonance (ST-FMR) technique. This ratio can further increase to 0.14 by
+inducing dopants, like Al and CoSi, into PtSn4. The dopants can also decrease
+(Al doping) or increase (CoSi doping) the resistivity of PtSn4. The work
+proposed a way to enhance the spin-orbit coupling (SOC) in amorphous TSs with
+dopants.",2202.01384v1
+2022-03-08,Enhancement of thermal spin pumping by orbital angular momentum of rare earth iron garnet,"In a bilayer of ferromagnetic and non-magnetic metal, spin pumping can be
+generated by a thermal gradient. The spin current generation depends on the
+spin mixing conductance of the interface and the magnetic properties of the
+ferromagnetic layer. Due to its low intrinsic damping, rare earth iron garnet
+is often used for the ferromagnetic layer in the spin Seebeck experiment.
+However, it is actually a ferrimagnetic with antiferromagnetically coupled
+magnetic lattices and the contribution of rare earth magnetic lattice of rare
+earth iron garnet on thermal spin pumping is not well understand. Here we focus
+on the effect of magnetic properties of lanthanide and show that the orbital
+angular momentum of rare earth iron garnet enhances thermal spin current
+generation of lanthanide substituted yttrium iron garnet.",2203.03915v2
+2022-06-08,Quarkonium in a spin dependent quark anti-quark potential at finite temperature,"We study the states of $c\bar{c}$ and $b\bar{b}$ system in a non-relativistic
+a spin dependent potential model at finite temperature. The potential
+incorporate color screening effect through a parameter $\mu$. The parameter
+$\mu$ along with strong coupling constant $\alpha_s$ and string tension
+$\sigma$ are taken temperature dependent and their values are fitted to the
+Lattice data of quark anti-quark potential available at different values of
+temperature. The applied potential include spin-spin, spin-orbital, tensor
+interactions which allow us to study spin singlet and triplet states of
+quarkonia. By solving non-relativistic Schr{\""o}dinger equation, we find the
+spectrum of quarkonium states at different temperature and also determine the
+critical temperature at which each state is dissolved. We find the critical
+temperature is decreased with orbital and radial excitations, however, for spin
+singlet and triplet states it remains same.",2206.04169v1
+2004-12-10,Spin-orbit induced mixed-spin ground state in $R$NiO$_3$ perovskites probed by XAS: new insight into the metal to insulator transition,"We report on a Ni L$_{2,3}$ edges x-ray absorption spectroscopy (XAS) study
+in $R$NiO$_3$ perovskites. These compounds exhibit a metal to insulator ($MI$)
+transition as temperature decreases. The L$_{3}$ edge presents a clear
+splitting in the insulating state, associated to a less hybridized ground
+state. Using charge transfer multiplet calculations, we establish the
+importance of the crystal field and 3d spin-orbit coupling to create a
+mixed-spin ground state. We explain the $MI$ transition in $R$NiO$_3$
+perovskites in terms of modifications in the Ni$^{3+}$ crystal field splitting
+that induces a spin transition from an essentially low-spin (LS) to a
+mixed-spin state.",0412276v1
+2007-07-26,Spin separation in a T ballistic nanojunction due to lateral-confinement-induced spin-orbit-coupling,"We propose a new scheme of spin filtering employing ballistic nanostructures
+in two dimensional electron gases (2DEGs). The proposal is essentially based on
+the spin-orbit (SO) interaction arising from the lateral confining electric
+field. This sets the basic difference with other works employing ballistic
+crosses and T junctions with the conventional SO term arising from 2DEG
+confinement. We discuss the consequences of this different approach on
+magnetotransport properties of the device, showing that the filter can in
+principle be used not only to generate a spin polarized current but also to
+perform an electric measurement of the spin polarization of a charge current.
+We focus on single-channel transport and investigate numerically the spin
+polarization of the current.",0707.3918v1
+2009-11-06,Spin-polarized electric currents in quantum transport through tubular two-dimensional electron gases,"Scattering theory is employed to derive a Landauer-type formula for the spin
+and the charge currents, through a finite region where spin-orbit interactions
+are effective. It is shown that the transmission matrix yields the spatial
+direction and the magnitude of the spin polarization. This formula is used to
+study the currents through a tubular two-dimensional electron gas. In this
+cylindrical geometry, which may be realized in experiment, the transverse
+conduction channels are not mixed (provided that the spin-orbit coupling is
+uniform). It is then found that for modest boundary scattering, each step in
+the quantized conductance is split into two, and the new steps have a non-zero
+spin conductance, with the spin polarization perpendicular to the direction of
+the current.",0911.1347v4
+2010-11-11,Anomalous spin-resolved point-contact transmission of holes due to cubic Rashba spin-orbit coupling,"Evidence is presented for the finite wave vector crossing of the two lowest
+one-dimensional spin-split subbands in quantum point contacts fabricated from
+two-dimensional hole gases with strong spin-orbit interaction. This phenomenon
+offers an elegant explanation for the anomalous sign of the spin polarization
+filtered by a point contact, as observed in magnetic focusing experiments.
+Anticrossing is introduced by a magnetic field parallel to the channel or an
+asymmetric potential transverse to it. Controlling the magnitude of the
+spin-splitting affords a novel mechanism for inverting the sign of the spin
+polarization.",1011.2676v2
+2011-02-15,Spin dynamics in the strong spin-orbit coupling regime,"We study the spin dynamics in a high-mobility two dimensional electron gas
+(2DEG) with generic spin-orbit interactions (SOIs). We derive a set of spin
+dynamic equations which capture the purely exponential to the damped
+oscillatory spin evolution modes observed in different regimes of SOI strength.
+Hence we provide a full treatment of the D'yakonov-Perel's mechanism by using
+the microscopic linear response theory from the weak to the strong SOI limit.
+We show that the damped oscillatory modes appear when the electron scattering
+time is larger than half of the spin precession time due to the SOI, in
+agreement with recent observations. We propose a new way to measure the
+scattering time and the relative strength of Rashba and linear Dresselhaus SOIs
+based on these modes and optical grating experiments. We discuss the physical
+interpretation of each of these modes in the context of Rabi oscillation.",1102.3170v1
+2015-07-31,Evidence of Ising pairing in superconducting NbSe$_2$ atomic layers,"Two-dimensional transition metal dichalcogenides with strong spin-orbit
+interactions and valley-dependent Berry curvature effects have attracted
+tremendous recent interests. Although novel single-particle and excitonic
+phenomena related to spin-valley coupling have been extensively studied,
+effects of spin-momentum locking on collective quantum phenomena remain
+unexplored. Here we report an observation of superconducting monolayer NbSe$_2$
+with an in-plane upper critical field over six times of the Pauli paramagnetic
+limit by magneto-transport measurements. The effect can be understood in terms
+of the competing Zeeman effect and large intrinsic spin-orbit interactions in
+non-centrosymmetric NbSe$_2$ monolayers, where the electronic spin is locked to
+the out-of-plane direction. Our results provide a strong evidence of
+unconventional Ising pairing protected by spin-momentum locking and open up a
+new avenue for studies of non-centrosymmetric superconductivity with unique
+spin and valley degrees of freedom in the exact two-dimensional limit.",1507.08731v1
+2015-09-02,Pauli Spin Blockade of Heavy Holes in a Silicon Double Quantum Dot,"In this work, we study hole transport in a planar silicon
+metal-oxide-semiconductor based double quantum dot. We demonstrate Pauli spin
+blockade in the few hole regime and map the spin relaxation induced leakage
+current as a function of inter-dot level spacing and magnetic field. With
+varied inter-dot tunnel coupling we can identify different dominant spin
+relaxation mechanisms. Applying a strong out-of-plane magnetic field causes an
+avoided singlet-triplet level crossing, from which the heavy hole g-factor
+$\sim$ 0.93, and the strength of spin-orbit interaction $\sim$ 110 $\mu$eV, can
+be obtained. The demonstrated strong spin-orbit interaction of heavy hole
+promises fast local spin manipulation using only electrical fields, which is of
+great interest for quantum information processing.",1509.00553v1
+2016-01-13,Lifshitz transition driven by spin fluctuations and spin-orbit renormalization in NaOsO$_3$,"In systems where electrons form both dispersive bands and small local spins,
+we show that changes of the spin configuration can tune the bands through a
+Lifshitz transition, resulting in a continuous metal-insulator transition
+associated with a progressive change of the Fermi surface topology. In contrast
+to a Mott-Hubbard and Slater pictures, this spin-driven Lifshitz transition
+appears in systems with small electron-electron correlation and large
+hybridization. We show that this situation is realized in 5$d$ distorted
+perovskites with an half-filled $t_{2g}$ bands such as NaOsO$_3$, where the
+strong $p-d$ hybridization reduces the local moment, and spin-orbit coupling
+causes a large renormalization of the electronic mobility. This weakens the
+role of electronic correlations and drives the system towards an itinerant
+magnetic regime which enables spin-fluctuations.",1601.03310v3
+2016-09-26,Elastic Spin Hall effect in Mechanical Graphene,"We show that spin-orbit interaction and elastic spin-Hall effect can exist in
+a classical mechanical system consisting of a two-dimensional honeycomb lattice
+of masses and springs. The band structure shows the presence of splitting at K
+point induced by the difference of longitudinal and transverse elastic
+constant, and this splitting can be regarded as an effective Dresselhaus-type
+spin-orbit coupling. Interestingly, as an initial displacement away from the
+equilibrium is applied, the time evolution simulation shows that waves of
+different spin polarization propagates along different directions at the Gamma
+and K point, which is characteristic of spin-Hall effect. Several cases for
+spin-Hall effect are also discussed.",1609.08061v1
+2017-03-14,A Novel Spin-Orbit Torque due to Conduction Electrons,"The anomalous Hall effect is mainly used to probe the magnetization
+orientation in ferromagnetic materials. A less explored aspect is the torque
+acting back on magnetization, an effect that can be important at high currents.
+The spin-orbit coupling of the conduction electrons causes spin-up and
+spin-down electrons to scatter to opposite sides when a charge current flows in
+the sample. This is equivalent to a spin current with orientation and flow
+perpendicular to the driving charge current, leading to a non-equilibrium spin
+accumulation that exerts a torque on the bulk magnetization through the s-d
+exchange interaction. The symmetry of this toque is that of an uniaxial
+anisotropy along the driving current. The large screening currents generated
+with laser pulses in all-optical magnetic switching experiments make for
+practical uses of this torque.",1703.04724v2
+2017-03-31,"Comment on ""Spin-Orbit Coupling Induced Gap in Graphene on Pt(111) with Intercalated Pb Monolayer""","Recently a paper of Klimovskikh et al. was published presenting experimental
+and theoretical analysis of the graphene/Pb/Pt(111) system. The authors
+investigate the crystallographic and electronic structure of this
+graphene-based system by means of LEED, ARPES, and spin-resolved PES of the
+graphene $\pi$ states in the vicinity of the Dirac point of graphene. The
+authors of this paper demonstrate that an energy gap of approx. 200 meV is
+opened in the spectral function of graphene directly at the Dirac point of
+graphene and spin-splitting of 100 meV is detected for the upper part of the
+Dirac cone. On the basis of the spin-resolved photoelectron spectroscopy
+measurements of the region around the gap the authors claim that these
+splittings are of a spin-orbit nature and that the observed spin structure
+confirms the observation of the quantum spin Hall state in graphene, proposed
+in earlier theoretical works. Here we will show that careful systematic
+analysis of the experimental data presented in this manuscript is needed and
+their interpretation require more critical consideration for making such
+conclusions. Our analysis demonstrates that the proposed effects and
+interpretations are questionable and require further more careful experiments.",1704.00034v1
+2014-05-07,Organic Magnetoelectroluminescence for Room Temperature Transduction between Magnetic and Optical Information,"Magnetic and spin-based technologies for data storage and processing pose
+unique challenges for information transduction to light because of magnetic
+metals' optical loss, and the inefficiency and resistivity of semiconductor
+spin-based emitters at room temperature. Transduction between magnetic and
+optical information in typical organic semiconductors poses additional
+challenges as the Faraday and Kerr magnetooptical effects rely on the
+electronic spin-orbit interaction, and the spin-orbit interaction in organics
+is weak. Other methods of coupling light and spin have emerged in organics,
+however, as the spin-dependent character of exciton recombination, with spin
+injection from magnetic electrodes, provides magnetization-sensitive light
+emission, although such approaches have been limited to low temperature and low
+polarization efficiency. Here we demonstrate room temperature information
+transduction between a magnet and an organic light emitting diode that does not
+require electrical current, based on control via the magnet's remanent field of
+the exciton recombination process in the organic semiconductor.",1405.1664v1
+2016-05-16,Spin-polarization in the vicinity of quantum point contact with spin-orbit interaction,"We have developed a novel technique for detection of spin polarization with a
+quantum dot weakly coupled to the objective device. The disturbance to the
+object in this technique is very small since the detection is performed through
+sampling of single electrons in the object with very slow rate. We have applied
+the method to a quantum point contact (QPC) under a spin-orbit interaction. A
+high degree of spin polarization in the vicinity of the QPC was detected when
+the conductance stayed on a plateau at a half of the unit conductance quantum
+($G_{\rm q}/2\equiv e^2/h$), and also on another plateau at $2e^2/h$. On the
+half-quantum plateau, the degree of polarization $P$ decreased with the bias
+source-drain voltage of the QPC while $P$ increased on the single-quantum
+plateau, manifesting that different mechanisms of polarization were working on
+these plateaus. Very long spin relaxation times in the detector quantum dot
+probably due to dynamical nuclear spin polarization were observed. Anomalous
+decrease of $P$ around zero-bias was observed at a Kondo-like resonance peak.",1605.04685v1
+2016-07-30,Anisotropic Pauli spin blockade in hole quantum dots,"We present measurements on gate-defined double quantum dots in Ge-Si
+core-shell nanowires, which we tune to a regime with visible shell filling in
+both dots. We observe a Pauli spin blockade and can assign the measured leakage
+current at low magnetic fields to spin-flip cotunneling, for which we measure a
+strong anisotropy related to an anisotropic g-factor. At higher magnetic fields
+we see signatures for leakage current caused by spin-orbit coupling between
+(1,1)-singlet and (2,0)-triplet states. Taking into account these anisotropic
+spin-flip mechanisms, we can choose the magnetic field direction with the
+longest spin lifetime for improved spin-orbit qubits.",1608.00111v1
+2016-12-05,Spin-dependent thermoelectric effects in graphene based superconductor junctions,"Using the Bogoliubov de-Gennes formalism, we investigate the charge and
+spin-dependent thermoelectric effects in superconductor graphene junctions.
+Results demonstrate that despite normal-superconductor junctions, there is a
+temperature-dependent spin thermopower both in the graphene-based
+ferromagnetic-superconductor (F-S) and ferromagnetic-Rashba spin-orbit
+region-superconductor (F-RSO-S) junctions. It is also shown that in the
+presence of Rashba spin-orbit interaction, the charge and spin-dependent
+Seebeck coefficients can reach to their maximum up to 3.5$k_B/e$ and
+2.5$k_B/e$, respectively. Remarkably, these coefficients have a zero-point
+critical value with respect to magnetic exchange field and chemical potential.
+This effect disappears when the Rashba coupling is absent. These results
+suggest that graphene-based superconductors can be used in spin-caloritronics
+devices.",1612.01461v1
+2016-12-21,Spin transitions driven by electric dipole spin resonance in fluorinated single- and bilayer-graphene quantum dots,"Spin transitions driven by a periodically varying electric potential in
+dilute fluorinated graphene quantum dots are investigated. Flakes of monolayer
+graphene are considered as well as electrostatic electron traps induced in
+bilayer graphene. The stationary states are obtained within the tight-binding
+approach and are used to the basis of eigenstates to describe the system
+dynamics. The dilute fluorination of the top layer lifts the valley degeneracy
+of the confined states and attenuates the orbital magnetic dipole moments due
+to current circulation within the flake. Moreover, the spin-orbit coupling
+introduced by the surface deformation of the top layer induced by the adatoms
+allows spin flips to be driven by the AC electric field. For the bilayer
+quantum dots the spin flip times is substantially shorter than the experimental
+spin relaxation. Dynamical effects including many-photon and multilevel
+transitions are also discussed.",1612.07001v1
+2018-10-16,On-chip detection of spin-selective routing in plasmonic nanocircuits,"On-chip manipulating and controlling the temporal and spatial evolution of
+light is of crucial importance for information processing in future planar
+integrated nanophotonics. The spin and orbital angular momentum of light, which
+can be treated independently in classical macroscopic geometrical optics,
+appear to be coupled on subwavelength scales. We use spin-orbit interactions in
+a plasmonic achiral nano-coupler to unidirectionally excite surface plasmon
+polariton modes propagating in seamlessly integrated plasmonic slot waveguides.
+The spin-dependent flow of light in the proposed nanophotonic circuit allows
+on-chip electrical detection of the spin state of incident photons by
+integrating two germanium-based plasmonic-waveguide photodetectors.
+Consequently, our device serves as a compact ($\sim$ 6 $\times$ 18 $\mu$m$^2$)
+electrical sensor for photonic spin Hall dynamics. The demonstrated
+configuration opens new avenues for developing highly-integrated
+polarization-controlled optical devices that would exploit the spin-degree of
+freedom for manipulating and controlling subwavelength optical modes in
+nanophotonic systems.",1810.06922v1
+2017-09-23,Spin precession in spin-orbit coupled weak links: Coulomb repulsion and Pauli quenching,"A simple model for the transmission of pairs of electrons through a weak
+electric link in the form of a nanowire made of a material with strong electron
+spin-orbit interaction (SOI) is presented, with emphasis on the effects of
+Coulomb interactions and the Pauli exclusion principle. The constraints due to
+the Pauli principle are shown to ""quench"" the coherent SOI-induced precession
+of the spins when the spatial wave packets of the two electrons overlap
+significantly. The quenching, which results from the projection of the pair's
+spin states onto spin-up and spin-down states on the link, breaks up the
+coherent propagation in the link into a sequence of coherent hops that add
+incoherently. Applying the model to the transmission of Cooper pairs between
+two superconductors, we find that in spite of Pauli quenching, the Josephson
+current oscillates with the strength of the SOI, and may even change its sign.
+Conditions for an experimental detection of these features are discussed.",1709.08022v2
+2018-08-12,Tunable magnetoresistance in spin-orbit coupled graphene junctions,"Using the Landauer-B\""utikker formalism, we study the graphene
+magneto-transport in the presence of Rashba spin-orbit interaction (RSOI). We
+show that the angle resolved transmission probability in the proposed
+structures can be tuned by the RSOI strength. The transmission spectrum show
+Klein tunneling in the parallel (P) magnetization configuration which can be
+blocked by the RSOI. This effect is also observable for the anti-parallel (AP)
+magnetization configuration in different incident angle. The numerical results
+shows that the spin-polarized conductance strongly depends on the strength of
+the RSOI and can be generated by tuning the magnetic exchange field and RSOI
+strength. This spin-polarized conductance is a sensitive oscillatory function
+of the thickness of the RSO region. Because of the spin-flip effect, the
+junction shows a spin-valve effect with large and negative magnetoresistance
+(MR) and spin-magnetoresistance (SMR) in the presence of RSOI. When the RSOI is
+on, the frequency and amplitude of shot-noise and Fano factor's oscillations
+are also increased. These results can provide a way to extending the
+application of graphene-based junctions in spintronics.",1808.03957v1
+2023-01-01,Spin Hall Induced Magnetization Dynamics in Multiferroic Tunnel Junction,"The combination of spin-orbit coupling driven effects and multiferroic
+tunneling properties was explored experimentally in thin Pt/Co/BTO/LSMO
+multilayers. The presence of a Pt heavy metal allows for the spin
+current-induced magnetization precession of Co upon radio-frequency charge
+current injection. The utilization of a BTO ferroelectric tunnel barrier
+separating the Co and LSMO ferromagnetic electrodes gives rise to both
+tunneling-magnetoresistance and electroresistance. Using the spin-orbit torque
+ferromagnetic resonance, the maganetization dynamics of the Co/Pt bilayers was
+studied at room temperature. Unexpectedly the magnetization dynamics study in
+the same geometry performed at low temperature reveals the existence of both Co
+and LSMO resonance peaks indicating efficient spin current generation both
+using the spin Hall effect in Pt and spin pumping in LSMO that tunnel via the
+BTO barrier.",2301.00459v1
+2023-02-15,Approximate SU(4) spin models on triangular and honeycomb lattices in twisted AB-Stacked WSe$_2$ homo-bilayer,"In this paper, we derive lattice models for the narrow moir\'e bands of the
+AB-stacked twisted WSe$_2$ homobilayer through continuum model and Wannier
+orbital construction. Previous work has shown that an approximate SU(4) Hubbard
+model may be realized by combining spin and layer because inter-layer tunneling
+is suppressed due to spin $S_z$ conservation. However, Rashba spin-orbit
+coupling (SOC) was ignored in the previous analysis. Here, we show that a
+Rashba SOC of reasonable magnitude can induce a finite but very small
+inter-layer hopping in the final lattice Hubbard model. At total filling $n=1$,
+we derive a spin-layer model on a triangular lattice in the large-U limit where
+the inter-layer tunneling contributes as a sublattice-dependent transverse
+Ising field for the layer pseudospin. We then show that the $n=2$ Mott
+insulator is also captured by an approximate SU(4) spin model, but now on
+honeycomb lattice. We comment on the possibility of a Dirac spin liquid (DSL)
+and competing phases due to SU(4) anisotropy terms.",2302.07750v1
+2003-09-24,Magnetic susceptibilities of diluted magnetic semiconductors and anomalous Hall-voltage noise,"The carrier spin and impurity spin densities in diluted magnetic
+semiconductors are considered using a semiclassical approach. Equations of
+motions for the spin densities and the carrier spin current density in the
+paramagnetic phase are derived, exhibiting their coupled diffusive dynamics.
+The dynamical spin susceptibilities are obtained from these equations. The
+theory holds for p-type and n-type semiconductors doped with magnetic ions of
+arbitrary spin quantum number. Spin-orbit coupling in the valence band is shown
+to lead to anisotropic spin diffusion and to a suppression of the Curie
+temperature in p-type materials. As an application we derive the Hall-voltage
+noise in the paramagnetic phase. This quantity is critically enhanced close to
+the Curie temperature due to the contribution from the anomalous Hall effect.",0309547v1
+2011-02-17,SU(2)-invariant spin liquids on the triangular lattice with spinful Majorana excitations,"We describe a new class of spin liquids with global SU(2) spin rotation
+symmetry in spin 1/2 systems on the triangular lattice, which have real
+Majorana fermion excitations carrying spin S = 1. The simplest
+translationally-invariant mean-field state on the triangular lattice breaks
+time-reversal symmetry and is stable to fluctuations. It generically possesses
+gapless excitations along 3 Fermi lines in the Brillouin zone. These intersect
+at a single point where the excitations scale with a dynamic exponent z = 3. An
+external magnetic field has no orbital coupling to the SU(2) spin
+rotation-invariant fermion bilinears that can give rise to a transverse thermal
+conductivity, thus leading to the absence of a thermal Hall effect. The Zeeman
+coupling is found to gap out two-thirds of the z = 3 excitations near the
+intersection point and this leads to a suppression of the low temperature
+specific heat, the spin susceptibility and the Wilson ratio. We also compute
+physical properties in the presence of weak disorder and discuss possible
+connections to recent experiments on organic insulators.",1102.3690v2
+2016-03-26,Direct coupling between charge current and spin polarization by extrinsic mechanisms in graphene,"Spintronics---the all-electrical control of the electron spin for quantum or
+classical information storage and processing---is one of the most promising
+applications of the two-dimensional material graphene. Although pristine
+graphene has negligible spin-orbit coupling (SOC), both theory and experiment
+suggest that SOC in graphene can be substantially enhanced by extrinsic means,
+such as functionalization by adatom impurities. We present a theory of
+transport in graphene that accounts for the full spin-coherent dynamics of the
+carriers, including hitherto-neglected spin precession processes during
+resonant scattering with dilute impurities. We identify a novel ""anisotropic
+spin precession scattering"" process, specific to two dimensions and extrinsic
+SOC, which contributes to a large current-induced spin polarization in
+graphene. The theory also yields a comprehensive description of the spin
+relaxation mechanisms in impurity-decorated graphene: the Elliot-Yafet and
+Dyakonov-Perel relaxation rates are both present, and we find that the latter
+can dominate for some choices of carrier density and impurity strength. This
+provides theoretical foundations for designing future graphene-based integrated
+spintronic devices.",1603.08107v2
+2014-05-06,Mechanically induced spin resonance in a carbon nanotube,"The electron spin is a promising qubit candidate for quantum computation and
+quantum information. Here we propose and analyze a mechanically-induced single
+electron spin resonance, which amounts to a rotation of the spin about the
+$x$-axis in a suspended carbon nanotube. The effect is based on the coupling
+between the spin and the mechanical degree of freedom due to the intrinsic
+curvature-induced spin-orbit coupling. A rotation about the $z$-axis is
+obtained by the off-resonant external electric driving field. Arbitrary-angle
+rotations of the single electron spin about any axis in the $x$-$z$ plane can
+be obtained with a single operation by varying the frequency and the strength
+of the external electric driving field. With multiple steps combining the
+rotations about the $x$- and $z$-axes, arbitrary-angle rotations about
+arbitrary axes can be constructed, which implies that any single-qubit gate of
+the electron spin qubit can be performed. We simulate the system numerically
+using a master equation with realistic parameters.",1405.1347v1
+2019-07-03,Anisotropy of spin-transfer torques and Gilbert damping induced by Rashba coupling,"Spin-transfer torques (STT), Gilbert damping (GD), and effective spin
+renormalization (ESR) are investigated microscopically in a 2D Rashba
+ferromagnet with spin-independent Gaussian white-noise disorder. Rashba
+spin-orbit coupling induced anisotropy of these phenomena is thoroughly
+analysed. For the case of two partly filled spin subbands, a remarkable
+relation between the anisotropic STT, GD, and ESR is established. In the
+absence of magnetic field and other torques on magnetization, this relation
+corresponds to a current-induced motion of a magnetic texture with the
+classical drift velocity of conduction electrons. Finally, we compute spin
+susceptibility of the system and generalize the notion of spin-polarized
+current.",1907.02041v3
+2020-12-08,Spin emitters beyond the point dipole approximation in nanomagnonic cavities,"Control over transition rates between spin states of emitters is crucial in a
+wide variety of fields ranging from quantum information science to the
+nanochemistry of free radicals. We present an approach to drive a both electric
+and magnetic dipole-forbidden transition of a spin emitter by placing it in a
+nanomagnonic cavity, requiring a description of both the spin emitter beyond
+the point dipole approximation and the vacuum magnetic fields of the
+nanomagnonic cavity with a large spatial gradient over the volume of the spin
+emitter. We specifically study the SiV$^-$ defect in diamond, whose
+Zeeman-split ground states comprise a logical qubit for solid-state quantum
+information processing, coupled to a magnetic nanoparticle serving as a model
+nanomagnonic cavity capable of concentrating microwave magnetic fields into
+deeply subwavelength volumes. Through first principles modeling of the SiV$^-$
+spin orbitals, we calculate the spin transition densities of magnetic
+dipole-allowed and -forbidden transitions and calculate their coupling rates to
+various multipolar modes of the nanomagnonic cavity. We envision using such a
+framework for quantum state transduction and state preparation of spin qubits
+at GHz frequency scales.",2012.04662v1
+2018-06-07,Spin accumulation and dynamics in inversion-symmetric van der Waals crystals,"Inversion symmetric materials are forbidden to show an overall spin texture
+in their band structure in the presence of time-reversal symmetry. However, in
+van der Waals materials which lack inversion symmetry within a single layer, it
+has been proposed that a layer-dependent spin texture can arise leading to a
+coupled spin-layer degree of freedom. Here we use time-resolved Kerr rotation
+in inversion symmetric WSe$_{2}$ and MoSe$_{2}$ bulk crystals to study this
+spin-layer polarization and unveil its dynamics. Our measurements show that the
+spin-layer relaxation time in WSe$_2$ is limited by phonon-scattering at high
+temperatures and that the inter-layer hopping can be tunned by a small in-plane
+magnetic field at low temperatures, enhancing the relaxation rates. We find a
+significantly lower lifetime for MoSe$_{2}$ which agrees with theoretical
+expectations of a spin-layer polarization stabilized by the larger spin-orbit
+coupling in WSe$_2$.",1806.02558v1
+2020-03-03,Spin Hall Effects in Antiferromagnets,"Recent experiments demonstrate that antiferromagnets exhibit the spin Hall
+effect. We study a tight-binding model of an antiferromagnet on a square
+lattice with Rashba spin-orbit coupling and disorder. By exact diagonalization
+of a finite system connected to reservoirs within the
+Landauer-B$\ddot{\text{u}}$ttiker formalism, we compute the transverse spin
+Hall current in response to a longitudinal voltage difference. Surprisingly,
+the spin Hall conductance can be considerably larger in antiferromagnets than
+in normal metals. We compare our results to the Berry-phase-induced spin Hall
+effect governed by the intrinsic contribution in the Kubo formula. The
+Berry-phase-induced intrinsic spin Hall conductivity in bulk systems shows the
+opposite behavior: large exchange couplings in AFs drastically reduce the spin
+Hall current.",2003.01714v2
+2022-06-23,Valley spin-acoustic resonance in MoS${\bf _2}$ monolayers,"The band structure of a monolayer MoS$_2$ comprises of spin-split subbands,
+owing to the mutual presence of broken inversion symmetry and strong spin-orbit
+coupling. In the conduction band, spin-valley coupled subbands cross each other
+at finite momenta, and they are valley-degenerate. When exposed to surface
+acoustic waves, the emerging strain-induced effective magnetic field can give
+rise to spin-flip transitions between the spin-split subbands in the vicinity
+of subbands crossing point, resulting in the emergence of a spin-acoustic
+resonance and the acoustoelectric current. An external magnetic field breaks
+the valley degeneracy resulting in the valley-selective splitting of
+spin-acoustic resonances both in surface acoustic wave absorption and
+acoustoelectric current.",2206.11551v1
+2023-05-10,Collisionless dynamics of superconducting gap excited by spin-splitting field,"We study the coherent dynamic interaction of a time-dependent spin-splitting
+field with the homogeneous superconducting order parameter $\Delta(t)$ mediated
+by spin-orbit coupling using the time-dependent Bogoliubov-de Gennes theory. In
+the first part of the work we show that linear response of the superconductor
+is strongly affected by the Zeeman field and spin-flip processes, giving rise
+to multiple resonant frequencies of the superconducting Higgs modes. These
+modes can be excited either by a quench, or by an additional non-stationary
+component of the spin-splitting field, which couples linearly to the Higgs
+modes. In the second part, we analyze the nonadiabatic dynamics of
+quasiparticle states arising from the intersection of spectral branches from
+different spin subbands, which can be provoked by a linearly growing Zeeman
+field. We provide insights into the dependence of the order parameter
+$\Delta(t)$ on this field and interference effects caused by tunneling of
+states at the avoided crossing points. We also show that since the nonadiabatic
+tunneling is related to spin-flip processes, the quasiparticle gas experiences
+a dynamic magnetization that contributes to its spin susceptibility.",2305.06201v1
+2023-12-22,Opportunities for the direct manipulation of a phase-driven Andreev spin qubit,"In a Josephson junction, the transfer of Cooper pairs from one superconductor
+to the other one can be associated with the formation of Andreev bound states.
+In a Josephson junction made with a semiconducting nanowire, the spin
+degeneracy of these Andreev states can be broken thanks to the presence of
+spin-orbit coupling and a finite phase difference between the two
+superconducting electrodes. The lifting of the spin degeneracy opened the way
+to the realization of Andreev spin qubits that do not require the application
+of a large magnetic field. So far the operation of these qubits relied on a
+Raman process involving two microwave tones and a third Andreev state [M. Hays
+et al., Science 373, 430 (2021)]. Still, time-reversal preserving impurities in
+the nanowire allow for spin-flip scattering processes. Here, using the
+formalism of scattering matrices, we show that these processes generically
+couple Andreev states with opposite spins. In particular, the non-vanishing
+current matrix element between them allows for the direct manipulation of
+phase-driven Andreev spin qubits, thereby circumventing the use of the
+above-mentioned Raman process.",2312.14865v1
+2024-01-27,Dragging of the particle spin and spin-spin coupling effect on its periapsis shift,"The periapsis shift (PS) of spinning test particles in the equatorial plane
+of arbitrary stationary and axisymmetric spacetime is studied using the
+post-Newtonian method. The result is expressed as a half-integer power series
+of $M/p$ where $M$ is the spacetime mass and $p$ is the semilatus rectum. The
+coefficients of the series are polynomials of the particle spin, the asymptotic
+expansion coefficients of the metric functions and the eccentricity of the
+orbit. The particle spin is shown to have a similar effect as the
+Lense-Thirring (LT) effect on the PS, and both of them appear from the
+$(M/p)^{-3/2}$ order in the PS. The coupling between the spacetime and particle
+spins will increase (or decrease) the PS if they are parallel (or
+antiparallel). For Jupiter and Saturn rotating around the Sun and exceptionally
+designed satellites around Mercury and Moon, the particle spin effect can be
+comparable to the LT one in size. The PS in other spacetime studied are not
+distinguishable from that in the Kerr spacetime to the $(M/p)^{-3/2}$ order.",2401.15342v1
+2004-01-12,Spin Transport in Two Dimensional Hopping Systems,"A two dimensional hopping system with Rashba spin-orbit interaction is
+considered. Our main interest is concerned with the evolution of the spin
+degree of freedom of the electrons. We derive the rate equations governing the
+evolution of the charge density and spin polarization of this system in the
+Markovian limit in one-particle approximation. If only two-site hopping events
+are taken into account, the evolution of the charge density and of the spin
+polarization is found to be decoupled. A critical electric field is found,
+above which oscillations are superimposed on the temporal decay of the total
+polarization. A coupling between charge density and spin polarization occurs on
+the level of three-site hopping events. The coupling terms are identified as
+the anomalous Hall effect and the recently proposed spin Hall effect. Thus, an
+unpolarized charge current through a sheet of finite width leads to a
+transversal spin accumulation in our model system.",0401171v1
+2004-09-13,DC Spin Current Generation in a Rashba-type Quantum Channel,"We propose and demonstrate theoretically that resonant inelastic scattering
+(RIS) can play an important role in dc spin current generation. The RIS makes
+it possible to generate dc spin current via a simple gate configuration: a
+single finger-gate that locates atop and orients transversely to a quantum
+channel in the presence of Rashba spin-orbit interaction. The ac biased
+finger-gate gives rise to a time-variation in the Rashba coupling parameter,
+which causes spin-resolved RIS, and subsequently contributes to the dc spin
+current. The spin current depends on both the static and the dynamic parts in
+the Rashba coupling parameter, $\alpha_0$ and $\alpha_1$, respectively, and is
+proportional to $\alpha_0 \alpha_1^2$. The proposed gate configuration has the
+added advantage that no dc charge current is generated. Our study also shows
+that the spin current generation can be enhanced significantly in a double
+finger-gate configuration.",0409291v3
+2007-06-17,Spin magnetotransport in two-dimensional hole systems,"Spin current of two-dimensional holes occupying the ground-state subband in
+an asymmetric quantum well and interacting with static disorder potential is
+calculated in the presence of a weak magnetic field H perpendicular to the well
+plane. Both spin-orbit coupling and Zeeman coupling are taken into account. It
+is shown that the applied electric field excites both the transverse
+(spin-Hall) and diagonal spin currents, the latter changes its sign at a finite
+H and becomes greater than the spin-Hall current as H increases. The effective
+spin-Hall conductivity introduced to describe the spin response in Hall bars is
+considerably enhanced by the magnetic field in the case of weak disorder and
+demonstrates a non-monotonic dependence on H.",0706.2468v1
+2014-08-27,Control of vibrational states by spin-polarized transport in a carbon nanotube resonator,"We study spin-dependent transport in a suspended carbon nanotube quantum dot
+in contact with two ferromagnetic leads and with the dot's spin coupled to the
+flexural mechanical modes. The spin-vibration interaction induces spin-flip
+processes between the two energy levels of the dot. This interaction arises
+from the spin-orbit coupling or a magnetic field gradient. The inelastic
+vibration-assisted spin flips give rise to a mechanical damping and, for an
+applied bias voltage, to a steady nonequilibrium occupation of the harmonic
+oscillator. We analyze these effects as function of the energy-level separation
+of the dot and the magnetic polarization of the leads. Depending on the
+magnetic configuration and the bias-voltage polarity, we can strongly cool a
+single mode or pump energy into it. In the latter case, we find that within our
+approximation, the system approaches eventually a regime of mechanical
+instability. Furthermore, owing to the sensitivity of the electron transport to
+the spin orientation, we find signatures of the nanomechanical motion in the
+current-voltage characteristic. Hence, the vibrational state can be read out in
+transport measurements.",1408.6357v3
+2015-06-26,One-dimensional spin texture of Bi(441); Quantum Spin Hall properties without a topological insulator,"The high index (441) surface of bismuth has been studied using Scanning
+Tunnelling Microscopy (STM), Angle Resolved Photoemission Spectroscopy (APRES)
+and spin-resolved ARPES. The surface is strongly corrugated, exposing a regular
+array of (110)-like terraces. Two surface localised states are observed, both
+of which are linearly dispersing in one in-plane direction ($k_x$), and
+dispersionless in the orthogonal in-plane direction ($k_y$), and both of which
+have a Dirac-like crossing at $k_x$=0. Spin ARPES reveals a strong in-plane
+polarisation, consistent with Rashba-like spin-orbit coupling. One state has a
+strong out-of-plane spin component, which matches with the miscut angle,
+suggesting its {possible} origin as an edge-state. The electronic structure of
+Bi(441) has significant similarities with topological insulator surface states
+and is expected to support one dimensional Quantum Spin Hall-like coupled
+spin-charge transport properties with inhibited backscattering, without
+requiring a topological insulator bulk.",1506.08017v1
+2016-02-25,Majorana spintronics,"We propose a systematic magnetic-flux-free approach to detect, manipulate and
+braid Majorana fermions in a semiconductor nanowire-based topological Josephson
+junction by utilizing the Majorana spin degree of freedom. We find an intrinsic
+$\pi$-phase difference between spin-triplet pairings enforced by the Majorana
+zeros modes (MZMs) at the two ends of a one-dimensional spinful topological
+superconductor. This $\pi$-phase is identified to be a spin-dependent
+superconducting phase, referred to as the spin-phase, which we show to be
+tunable by controlling spin-orbit coupling strength via electric gates. This
+electric controllable spin-phase not only affects the coupling energy between
+MZMs but also leads to a fractional Josephson effect in the absence of any
+applied magnetic flux, which enables the efficient topological qubit readout.
+We thus propose an all-electrically controlled superconductor-semiconductor
+hybrid circuit to manipulate MZMs and to detect their non-Abelian braiding
+statistics properties. Our work on spin properties of topological Josephson
+effects potentially opens up a new thrust for spintronic applications with
+Majorana-based semiconductor quantum circuits.",1602.08093v2
+2018-05-31,Observation of spin-valley coupling induced large spin lifetime anisotropy in bilayer graphene,"We report the first observation of a large spin lifetime anisotropy in
+bilayer graphene (BLG) fully encapsulated between hexagonal boron nitride. We
+characterize the out-of-plane ($\tau_\perp$) and in-plane ($\tau_\parallel$)
+spin lifetimes by oblique Hanle spin precession. At 75~K and the charge
+neutrality point (CNP) we observe a strong anisotropy of
+$\tau_\perp/\tau_\parallel$ = 8 $\pm$ 2. This value is comparable to
+graphene/TMD heterostructures, whereas our high quality BLG provides with
+$\tau_\perp$ up to 9~ns, a more than two orders of magnitude larger spin
+lifetime. The anisotropy decreases to 3.5 $\pm$ 1 at a carrier density of n =
+$6\times 10^{11}~$cm$^{-2}$. Temperature dependent measurements show above 75~K
+a decrease of $\tau_\perp/\tau_\parallel$ with increasing temperature, reaching
+the isotropic case close to room temperature. We explain our findings with
+electric field induced spin-valley coupling arising from the small intrinsic
+spin orbit fields in BLG of 12~$\mu$eV at the CNP.",1805.12420v1
+2023-03-21,Kondo enhancement of current induced spin accumulation in a quantum dot,"Weak spin-orbit coupling produces very limited current induced spin
+accumulation in semiconductor nanostructures. We demonstrate a possibility to
+increase parametrically the spin polarization using the Kondo effect. As a
+model object we consider a quantum dot side coupled to a quantum wire taking
+into account the spin dependent electron tunneling from the wire to the dot.
+Using the nonequilibrium Green's functions, we show that the many body
+correlations between the quantum dot and the quantum wire can increase the
+current induced spin accumulation at low temperatures by almost two orders of
+magnitude for the moderate system parameters. The enhancement is related to the
+Kondo peak formation in the density of states and the spin instability due to
+the strong Coulomb interaction. This effect may be useful to electrically
+manipulate the localized electron spins in quantum dots for their quantum
+applications.",2303.11778v1
+2021-11-25,Chirality-Induced Spin Filtering in Pseudo Jahn-Teller Molecules,"Chirality-induced spin selectivity (CISS) refers to an ability to induce a
+spin polarization of an electron transmitted through chiral materials. An
+important experimental observation is that incredibly large spin polarization
+is realized at room temperature even for organic molecules that have weak
+spin-orbit coupling (SOC), although SOC is the only interaction that can
+manipulate the electrons' spins in the setups. Therefore, the mechanism of the
+CISS needs to be constructed in a way insensitive to or enhancing the magnitude
+of the SOC strength. In this paper, we describe a theoretical study of CISS
+with a model chiral molecule that belongs to the point group $\mathrm{C}_3$. In
+this molecule, electronic translational and rotational degrees of freedom for
+an injected electron are coupled to one another via the nuclear vibrational
+mode with a pseudo Jahn-Teller effect. By properly taking the molecular
+symmetry as well as the time-reversal symmetry into account and classifying the
+molecular ground states by their angular- and spin-momentum quantum numbers, we
+show that the chiral molecule can act as an efficient spin filter. The
+efficiency of this spin filtering can be nearly independent of the SOC strength
+in this model, while it well exceeds the spin polarization relying solely on
+the SOC. The nuclear vibrations turned out to have the role of not only
+mediating the translation-rotation coupling, but also enhancing the
+spin-filtering efficiency.",2111.12917v2
+2016-09-01,Coupled orbital and spin evolution of the CoRoT-7 two-planet system using a Maxwell viscoelastic rheology,"We investigate the orbital and rotational evolution of the CoRoT-7 two-planet
+system, assuming that the innermost planet behaves like a Maxwell body. We
+numerically resolve the coupled differential equations governing the
+instantaneous deformation of the inner planet together with the orbital motion
+of the system. We show that, depending on the relaxation time for the
+deformation of the planet, the orbital evolution has two distinct behaviours:
+for relaxation times shorter than the orbital period, we reproduce the results
+from classic tidal theories, for which the eccentricity is always damped.
+However, for longer relaxation times, the eccentricity of the inner orbit is
+secularly excited and can grow to high values. This mechanism provides an
+explanation for the present high eccentricity observed for CoRoT-7 b, as well
+as for other close-in super-Earths in multiple planetary systems.",1609.00319v1
+2018-01-08,Stability of the Nagaoka-type Ferromagnetic State in a $t_{2g}$ Orbital System on a Cubic Lattice,"We generalize the previous exact results of the Nagaoka-type itinerant
+ferromagnetic states in a three dimensional $t_{2g}$-orbital system to allow
+for multiple holes. The system is a simple cubic lattice with each site
+possessing $d_{xy}$, $d_{yz}$, and $d_{xz}$ orbitals, which allow
+two-dimensional hopping within each orbital plane. In the strong coupling limit
+of $U\to \infty$, the orbital-generalized Nagaoka ferromagnetic states are
+proved degenerate with the ground state in the thermodynamic limit when the
+hole number per orbital layer scales slower than $L^{\frac{1}{2}}$. This result
+is valid for arbitrary values of the ferromagnetic Hund's coupling $J>0$ and
+inter-orbital repulsion $V\ge 0$. The stability of the Nagaoka-type state at
+finite electron densities with respect to a single spin-flip is investigated.
+These results provide helpful guidance for studying the mechanism of itinerant
+ferromagnetism for the $t_{2g}$-orbital materials.",1801.02583v2
+2020-11-03,Controlling directed atomic motion and second-order tunneling of a spin-orbit-coupled atom in optical lattices,"We theoretically explore the tunneling dynamics for the tight-binding (TB)
+model of a single spin-orbit-coupled atom trapped in an optical lattice
+subjected to lattice shaking and to time-periodic Zeeman field. By means of
+analytical and numerical methods, we demonstrate that the spin-orbit (SO)
+coupling adds some new results to the tunneling dynamics in both multiphoton
+resonance and far-off-resonance parameter regimes. When the driving frequency
+is resonant with the static Zeeman field (multi-photon resonances), we obtain
+an unexpected new dynamical localization (DL) phenomenon where the single
+SO-coupled atom is restricted to making perfect two-site Rabi oscillation
+accompanied by spin flipping.By using the unconventional DL phenomenon, we are
+able to generate a ratchetlike effect which enables directed atomic motion
+towards different directions and accompanies periodic spin-flipping under the
+action of SO coupling. For the far-off-resonance case, we show that by
+suppressing the usual inter-site tunneling alone, it is possible to realize a
+type of spin-conserving second-order tunneling between next-nearest-neighboring
+sites, which is not accessible in the conventional lattice system without SO
+coupling. We also show that simultaneous controls of the usual inter-site
+tunneling and the SO-coupling-related second-order-tunneling are necessary for
+quasienergies flatness (collapse) and completely frozen dynamics to exist.
+These results may be relevant to potential applications such as spin-based
+quantum information processing and design of novel spintronics devices.",2011.01399v2
+2002-12-03,Tunneling measurement of quantum spin oscillations,"We consider the problem of tunneling between two leads via a localized spin
+1/2 or any other microscopic system which can be modeled by a two-level
+Hamiltonian. We assume that a constant magnetic field ${\bf B}_0$ acts on the
+spin, that electrons in the leads are in the thermal equilibrium and that the
+tunneling electrons are coupled to the spin through exchange and spin-orbit
+interactions. Using the non-equilibrium Keldysh formalism we find the
+dependence of the spin-spin and current-current correlation functions on the
+applied voltage between leads $V$, temperature $T$, ${\bf B}_0$, and on the
+degree and orientation ${\bf m}_{\alpha}$ of spin polarization of the electrons
+in the right ($\alpha=$R) and left ($\alpha=$L) leads. We compare our results
+of a full quantum-mechanical treatment of the tunneling-via-spin model with
+those previously obtained in the quasi-classical approach, and discuss the
+experimental results observed using STM dynamic probes of the localized spin.",0212049v3
+2004-07-01,Rashba spin splitting in quantum wires,"This article presents an overview of results pertaining to electronic
+structure, transport properties, and interaction effects in ballistic quantum
+wires with Rashba spin splitting. Limits of weak and strong spin--orbit
+coupling are distinguished, and spin properties of the electronic states
+elucidated. The case of strong Rashba spin splitting where the spin--precession
+length is comparable to the wire width turns out to be particularly
+interesting. Hybridization of spin--split quantum--wire subbands leads to an
+unusual spin structure where the direction of motion for electrons can fix
+their spin state. This peculiar property has important ramifications for linear
+transport in the quantum wire, giving rise to spin accumulation without
+magnetic fields or ferromagnetic contacts. A description for interacting
+Rashba--split quantum wires is developed, which is based on a generalization of
+the Tomonaga--Luttinger model.",0407036v1
+2011-04-13,Spin diffusion in $n$-type (111) GaAs quantum wells,"We utilize the kinetic spin Bloch equation approach to investigate the
+steady-state spin diffusion in $n$-type (111) GaAs quantum wells, where the
+in-plane components of the Dresselhaus spin-orbit coupling term and the Rashba
+term can be partially canceled by each other. A peak of the spin diffusion
+length due to the cancellation is predicted in the perpendicular electric field
+dependence. It is shown that the spin diffusion length around the peak can be
+markedly controlled via temperature and doping. When the electron gas enters
+into the degenerate regime, the electron density also leads to observable
+influence on the spin diffusion in the strong cancellation regime. Furthermore,
+we find that the spin diffusion always presents strong anisotropy with respect
+to the direction of the injected spin polarization. The anisotropic spin
+diffusion depends on whether the electric field is far away from or in the
+strong cancellation regime.",1104.2496v2
+2011-04-21,Switching spin and charge between edge states in topological insulator constrictions,"Since the prediction of a new topological state of matter in graphene,
+materials acting as topological insulators have attracted wide attention.
+Shortly after the theoretical proposal for a mercury telluride (HgTe)-based
+two-dimensional topological insulator, the observation of the quantum spin Hall
+effect and non-local edge transport brought compelling experimental evidence
+for quantized conductance due to edges states. The spin orientation and
+propagation direction of such helical edge states are inherently connected,
+providing protection against backscattering. However, these features conversely
+render controlled spin operations such as spin switching difficult. Here we
+therefore propose constrictions as connectors between opposite edge (and spin)
+states in HgTe. We demonstrate how the coupling between edge states, which
+overlap in the constriction, can be employed both for steering the charge flow
+into different edge modes and for controlled spin switching. This gives rise to
+a three-state charge and spin transistor function. Unlike in a conventional
+spin transistor, the switching does not rely on a tunable Rashba spin-orbit
+interaction, but on the energy dependence of the edge state wavefunctions.
+Based on this mechanism, and supported by numerical transport calculations, we
+present two different ways to control spin- and charge-currents depending on
+the gating of the constriction.",1104.4284v1
+2011-07-30,Electron spin dephasing in two-dimensional systems with anisotropic scattering,"We develop a microscopic theory of spin relaxation of a two-dimensional
+electron gas in quantum wells with anisotropic electron scattering. Both
+precessional and collision-dominated regimes of spin dynamics are studied. It
+is shown that, in quantum wells with noncentrosymmetric scatterers, the
+in-plane and out-of-plane spin components are coupled: spin dephasing of
+carriers initially polarized along the quantum well normal leads to the
+emergence of an in-plane spin component even in the case of isotropic
+spin-orbit splitting. In the collision-dominated regime, the
+spin-relaxation-rate tensor is expressed in terms of the electric conductivity
+tensor. We also study the effect of an in-plane and out-of-plane external
+magnetic field on spin dephasing and show that the field dependence of electron
+spin can be very intricate.",1108.0107v1
+2013-02-11,Electrical control over single hole spins in nanowire quantum dots,"Single electron spins in semiconductor quantum dots (QDs) are a versatile
+platform for quantum information processing, however controlling decoherence
+remains a considerable challenge. Recently, hole spins have emerged as a
+promising alternative. Holes in III-V semiconductors have unique properties,
+such as strong spin-orbit interaction and weak coupling to nuclear spins, and
+therefore have potential for enhanced spin control and longer coherence times.
+Weaker hyperfine interaction has already been reported in self-assembled
+quantum dots using quantum optics techniques. However, challenging fabrication
+has so far kept the promise of hole-spin-based electronic devices out of reach
+in conventional III-V heterostructures. Here, we report gate-tuneable hole
+quantum dots formed in InSb nanowires. Using these devices we demonstrate Pauli
+spin blockade and electrical control of single hole spins. The devices are
+fully tuneable between hole and electron QDs, enabling direct comparison
+between the hyperfine interaction strengths, g-factors and spin blockade
+anisotropies in the two regimes.",1302.2648v1
+2014-02-20,Rashba-Zeeman-effect-induced spin filtering energy windows in a quantum wire,"We perform a numerical study on the spin-resolved transport in a quantum wire
+(QW) under the modulation of both Rashba spin-orbit coupling (SOC) and a
+perpendicular magnetic field (MF) by adopting the developed Usuki
+transfer-matrix method in combination with the Landauer-Buttiker formalism.
+Wide spin filtering energy windows can be achieved in this system for a
+spin-unpolarized injection. In addition, both the width of these energy windows
+and the magnitude of the spin conductance within these energy widows can be
+tuned by varying the Rashba SOC strength, which can be apprehended by analyzing
+the energy dispersions and the spin-polarized density distributions inside the
+QW, respectively. Further study also demonstrates that these
+Rashba-SOC-controlled spin filtering energy windows show a strong robustness
+against disorders. These findings may not only benefit to further understand
+the spin-dependent transport properties of the QW in the presence of external
+fields but also provide a theoretical instruction to design a spin filter
+device.",1402.4909v1
+2014-07-30,Room Temperature Spin Pumping in Topological Insulator Bi2Se3,"Three-dimensional (3D) topological insulators are known for their strong
+spin-orbit coupling and the existence of spin-textured topological surface
+states which could be potentially exploited for spintronics. Here, we
+investigate spin pumping from a metallic ferromagnet (CoFeB) into a 3D
+topological insulator (Bi2Se3) and demonstrate successful spin injection from
+CoFeB into Bi2Se3 and the direct detection of the electromotive force generated
+by the inverse spin Hal effect (ISHE) at room temperature. The spin pumping,
+driven by the magnetization dynamics of the metallic ferromagnet, introduces a
+spin current into the topological insulator layer, resulting in a broadening of
+the ferromagnetic resonance (FMR) linewidth. We find that the FMR linewidth
+more than quintuples, the spin mixing conductance can be as large as
+3.4*10^20m^-2 and the spin Hall angle can be as large as 0.23 in the Bi2Se3
+layer.",1407.7940v1
+2015-09-03,Nanomechanical detection of the spin Hall effect,"The spin Hall effect creates a spin current in response to a charge current
+in a material that has strong spin-orbit coupling. The size of the spin Hall
+effect in many materials is disputed, requiring independent measurements of the
+effect. We develop a novel mechanical method to measure the size of the spin
+Hall effect, relying on the equivalence between spin and angular momentum. The
+spin current carries angular momentum, so the flow of angular momentum will
+result in a mechanical torque on the material. We determine the size and
+geometry of this torque and demonstrate that it can be measured using a
+nanomechanical device. Our results show that measurement of the spin Hall
+effect in this manner is possible and also opens possibilities for actuating
+nanomechanical systems with spin currents.",1509.01269v3
+2016-01-06,Spin helical states and spin transport of the line defect in silicene lattice,"We investigated the electronic structure of a silicene-like lattice with a
+line defect under the consideration of spin-orbit coupling. In the bulk energy
+gap, there are defect related bands corresponding to spin helical states
+localized beside the defect line: spin-up electrons flow forward on one side
+near to the line defect and move backward on the other side, and vice verse for
+spin-down electrons. When the system is subjected to random distribution of
+spin-flipping scatterers, electrons suffer much less spin-flipped scattering
+when they transport along the line defect than in the bulk. An electric gate
+above the line defect can tune the spin-flipped transmission, which makes the
+line defect as a spin-controllable waveguide.",1601.01277v1
+2016-02-01,Equations of motion of test particles for solving the spin-dependent Boltzmann-Vlasov equation,"A consistent derivation of the equations of motion (EOMs) of test particles
+for solving the spin-dependent Boltzmann-Vlasov equation is presented. The
+resulting EOMs in phase space are similar to the canonical equations in
+Hamiltonian dynamics, and the EOM of spin is the same as that in the Heisenburg
+picture of quantum mechanics. Considering further the quantum nature of spin
+and choosing the direction of total angular momentum in heavy-ion reactions as
+a reference of measuring nucleon spin, the EOMs of spin-up and spin-down
+nucleons are given separately. The key elements affecting the spin dynamics in
+heavy-ion collisions are identified. The resulting EOMs provide a solid
+foundation for using the test-particle approach in studying spin dynamics in
+heavy-ion collisions at intermediate energies. Future comparisons of model
+simulations with experimental data will help constrain the poorly known
+in-medium nucleon spin-orbit coupling relevant for understanding properties of
+rare isotopes and their astrophysical impacts.",1602.00404v2
+2018-04-27,Pseudospin-driven spin relaxation mechanism in graphene,"The possibility of transporting spin information over long distances in
+graphene, owing to its small intrinsic spin-orbit coupling (SOC) and the
+absence of hyperfine interaction, has led to intense research into spintronic
+applications. However, measured spin relaxation times are orders of magnitude
+smaller than initially predicted, while the main physical process for spin
+dephasing and its charge-density and disorder dependences remain unconvincingly
+described by conventional mechanisms. Here, we unravel a spin relaxation
+mechanism for nonmagnetic samples that follows from an entanglement between
+spin and pseudospin driven by random SOC, which makes it unique to graphene.
+The mixing between spin and pseudospin-related Berry's phases results in fast
+spin dephasing even when approaching the ballistic limit, with increasing
+relaxation times away from the Dirac point, as observed experimentally. The SOC
+can be caused by adatoms, ripples or even the substrate, suggesting novel spin
+manipulation strategies based on the pseudospin degree of freedom.",1804.10682v1
+2016-08-02,Spintronics of Organometal Trihalide Perovskites,"The family of organometal trihalide perovskite (OTP), CH3NH3PbX3 (where X is
+halogen) has recently revolutionized the photovoltaics field and shows promise
+in a variety of optoelectronic applications. The characteristic spin properties
+of charge and neutral excitations in OTPs are influenced by the large
+spin-orbit coupling of the Pb atoms, which may lead to spin-based device
+applications. Here we report the first studies of pure spin-current and
+spin-aligned carrier injection in OTP spintronics devices using spin-pumping
+and spin-injection, respectively. We measure a relatively large
+inverse-spin-Hall effect using pulsed microwave excitation in OTP devices at
+resonance with a ferromagnetic substrate, from which we derive room temperature
+spin diffusion length, lambda_sd~9nm; and low-temperature giant
+magnetoresistance in OTP-based spin-valves from which we estimate
+lambda_sd~85nm.",1608.00993v1
+2012-05-16,Spin transport and spin dephasing in zinc oxide,"The wide bandgap semiconductor ZnO is interesting for spintronic applications
+because of its small spin-orbit coupling implying a large spin coherence
+length. Utilizing vertical spin valve devices with ferromagnetic electrodes
+(TiN/Co/ZnO/Ni/Au), we study the spin-polarized transport across ZnO in
+all-electrical experiments. The measured magnetoresistance agrees well with the
+prediction of a two spin channel model with spin-dependent interface
+resistance. Fitting the data yields spin diffusion lengths of 10.8nm (2K),
+10.7nm (10K), and 6.2nm (200K) in ZnO, corresponding to spin lifetimes of 2.6ns
+(2K), 2.0ns (10K), and 31ps (200K).",1205.3666v3
+2018-03-29,Detecting End-States of Topological Quantum Paramagnets via Spin Hall Noise Spectroscopy,"We theoretically study the equilibrium spin current fluctuations and the
+corresponding charge noise generated by inverse spin Hall effect (ISHE) in a
+metal with strong spin-orbit coupling deposited on top of a quantum paramagnet.
+It is shown that the charge noise power spectra measured along different
+spatial axes can directly probe the different spin components of the boundary
+dynamic spin correlations of the quantum paramagnet. We report the utility of
+this ISHE-facilitated spin noise probe as a tool to unambiguously detect
+topological phase transitions in an S=1/2 quantum spin ladder that hosts a
+trivial ground state of singlet product states, but topologically-protected
+fractional spin excitations localized at its ends. Our work demonstrates the
+general usefulness of the ISHE-mediated spin noise spectroscopy for the
+detection of topological phases in quantum paramagnets.",1803.11239v1
+2018-07-13,Free-Layer-Thickness-dependence of the Spin Galvanic Effect with Spin Rotation Symmetry,"Spin-orbit coupling near the surface of a ferromagnetic metal gives rises to
+spin-to-charge conversion with symmetry different from the conventional inverse
+spin Hall effect. We have previously observed this spin galvanic effect with
+spin rotation symmetry (SGE-SR) in a spin valve under a temperature gradient.
+Here we show there are two processes that contribute to the SGE-SR, one of
+which is sensitive to the free magnetic layer thickness, while the other only
+depends on the interface of the free layer. Based on the
+free-layer-thickness-dependent study, we extrapolate the spin diffusion length
+of Py to be 3.9+/-0.2 nm. We also propose that the SGE-SR can help to
+quantitatively study the spin Seebeck effect in metallic magnetic films.",1807.04918v2
+2019-11-04,The generic phase diagram of spin relaxation in solids and the Loschmidt echo,"The spin relaxation time in solids is determined by several competing energy
+scales and processes and distinct methods are called for to analyze the various
+regimes. We present a stochastic model for the spin dynamics in solids which is
+equivalent to solving the spin Boltzmann equation and takes the relevant
+processes into account on equal footing. The calculations reveal yet unknown
+parts of the spin-relaxation phase diagram, where strong spin-dephasing occurs
+in addition to spin-relaxation. Spin-relaxation times are obtained for this
+regime by introducing the numerical Loschmidt echo. This allows us to construct
+a generic approximate formula for the spin-relaxation time, $\tau_{\text{s}}$,
+for the entire phase diagram, involving the quasiparticle scattering rate,
+$\Gamma$, spin-orbit coupling strength, $\mathcal{L}$, and a magnetic term,
+$\Delta_{\text{Z}}$ due to the Zeeman effect. The generic expression reads as
+$\hbar/\tau_{\text{s}}\approx \Gamma\cdot \mathcal{L}^2
+/(\Gamma^2+\mathcal{L}^2+\Delta_{\text{Z}}^2)$.",1911.01482v1
+2020-06-14,"MoS2 thin-film transistors spin-states, of conduction electrons and vacancies, distinguished by operando electron spin resonance","Transition metal dichalcogenide MoS2 is a two-dimensional material,
+attracting much attention for next-generation applications thanks to rich
+functionalities stemmed from the crystal structure. Many experimental and
+theoretical works have focused on the spin-orbit interaction which couples the
+valley and spin degree of freedom so that the spin-states can be electrically
+controllable. However, the spin-states of charge carriers and vacancies have
+not been yet elucidated directly from a microscopic viewpoint. We report the
+spin-states in thin-film electric double-layer transistors using operando
+electron spin resonance (ESR) spectroscopy. We have observed clearly different
+ESR signals of the conduction electrons and vacancies, and distinguished the
+corresponding spin-states from the signals and theoretical calculations,
+evaluating the gate-voltage dependence and spin-susceptibility and g-factor
+temperature dependence. This analysis gives deep insight into the MoS2
+magnetism and clearly indicates the lower charge mobilities compared to
+graphene, which would be useful for improvements of the device characteristics
+and new applications.",2006.07842v1
+2021-04-07,Spin-helical detection in a semiconductor quantum device with ferromagnetic contacts,"Spin-helical states, which arise in quasi-one-dimensional (1D) channels with
+spin-orbital (SO) coupling, underpin efforts to realize topologically-protected
+quantum bits based on Majorana modes in semiconductor nanowires. Detecting
+helical states is challenging due to non-idealities present in real devices.
+Here we show by means of tight-binding calculations that by using ferromagnetic
+contacts it is possible to detect helical modes with high sensitivity even in
+the presence of realistic device effects, such as quantum interference. This is
+possible because of the spin-selective transmission properties of helical
+modes. In addition, we show that spin-polarized contacts provide a unique path
+to investigate the spin texture and spin-momentum locking properties of helical
+states. Our results are of interest not only for the ongoing development of
+Majorana qubits, but also as for realizing possible spin-based quantum devices,
+such as quantum spin modulators and interconnects based on spin-helical
+channels.",2104.02884v1
+2021-04-27,Symmetry-protected photonic chiral spin textures by spin-orbit coupling,"Chiral spin textures are researched widely in condensed matter systems and
+show potential for spintronics and storage applications. Along with extensive
+condensed-matter studies of chiral spin textures, photonic counterparts of
+these textures have been observed in various optical systems with broken
+inversion symmetry. Unfortunately, the resemblances are only phenomenological.
+This work proposes a theoretical framework based on the variational theorem to
+show that the formation of photonic chiral spin textures in an optical
+interface is derived from the system's symmetry and relativity. Analysis of the
+optical system's rotational symmetry indicates that conservation of the total
+angular momentum is preserved from the local variations of spin vectors.
+Specifically, although the integral spin momentum does not carry net energy,
+the local spin momentum distribution, which determines the local subluminal
+energy transport and minimization variation of the square of total angular
+momentum, results in the chiral twisting of the spin vectors. The findings here
+deepen the understanding of the symmetries, conservative laws and energy
+transportation in optical system, construct the comparability in the formation
+mechanisms and geometries of photonic and condensed-matter chiral spin
+textures, and suggest applications to optical manipulation and chiral
+photonics.",2104.12982v1
+2021-05-18,Chiral Phonon Activated Spin Seebeck Effect,"Efficient generation of spin polarization is the central focus of
+spintronics. In magnetic materials, spin currents can arise from heat currents
+by the conventional spin Seebeck effect. Recently, chiral phonons with definite
+handedness and angular momenta have also produced profound impacts on multiple
+research fields. In this paper, starting with nonequilibrium distribution of
+chiral phonons under temperature gradient, we find a new spin selectivity
+effect - chiral phonon activated spin Seebeck (CPASS) effect, in chiral
+materials without magnetic order nor spin-orbit coupling. With both phonon-drag
+and band transport contributions, the CPASS coefficients are computed based on
+the Boltzmann transport theory. The spin accumulations by the CPASS effect
+quadratically increase with temperature gradient, and vary with the chemical
+potential modulation, thus enabling highly efficient and tunable spin
+generation. The CPASS effect provides a promising explanation on the
+chiral-induced spin selectivity effect and opportunities for designing advanced
+spintronic devices based on nonmagnetic chiral materials.",2105.08485v2
+2023-03-10,Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient,"We have theoretically studied phonon-mediated spin-flip processes of
+electrons in a GaAs double quantum dot (DQD) holding two spins, under a phonon
+temperature gradient over the DQD. Transition rates of inter-dot
+phonon-assisted tunnel processes and intra-dot spin-flip processes involving
+spin triplet states are formalized by the electron-phonon interaction
+accompanied with the spin-orbit interaction. The calculations of the spin-flip
+rates and the occupation probabilities of the spin-states in the two-electron
+DQD with respect to the phonon temperature difference between the dots are
+quantitatively consistent with our previous experiment. This theoretical study
+on the temperature gradient effect onto spins in coupled QDs would be essential
+for understanding spin-related thermodynamic physics.",2303.05700v1
+2023-06-23,Spin-valley locking for in-gap quantum dots in a MoS2 transistor,"Spins confined to atomically-thin semiconductors are being actively explored
+as quantum information carriers. In transition metal dichalcogenides (TMDCs),
+the hexagonal crystal lattice gives rise to an additional valley degree of
+freedom with spin-valley locking and potentially enhanced spin life- and
+coherence times. However, realizing well-separated single-particle levels, and
+achieving transparent electrical contact to address them has remained
+challenging. Here, we report well-defined spin states in a few-layer MoS$ _2$
+transistor, characterized with a spectral resolution of $\sim{50~\mu}$eV at
+${T_\textrm{el} = 150}$~mK. Ground state magnetospectroscopy confirms a finite
+Berry-curvature induced coupling of spin and valley, reflected in a pronounced
+Zeeman anisotropy, with a large out-of-plane $g$-factor of ${g_\perp \simeq
+8}$. A finite in-plane $g$-factor (${g_\parallel \simeq 0.55-0.8}$) allows us
+to quantify spin-valley locking and estimate the spin-orbit splitting
+${2\Delta_{\rm SO} \sim 100~\mu}$eV. The demonstration of spin-valley locking
+is an important milestone towards realizing spin-valley quantum bits.",2306.13542v1
+2017-08-01,Spin Hall photoconductance in a 3D topological insulator at room temperature,"Three-dimensional topological insulators are a class of Dirac materials,
+wherein strong spin-orbit coupling leads to two-dimensional surface states. The
+latter feature spin-momentum locking, i.e., each momentum vector is associated
+with a spin locked perpendicularly to it in the surface plane. While the
+principal spin generation capability of topological insulators is well
+established, comparatively little is known about the interaction of the spins
+with external stimuli like polarized light. We observe a helical,
+bias-dependent photoconductance at the lateral edges of topological Bi2Te2Se
+platelets for perpendicular incidence of light. The same edges exhibit also a
+finite bias-dependent Kerr angle, indicative of spin accumulation induced by a
+transversal spin Hall effect in the bulk states of the Bi2Te2Se platelets. A
+symmetry analysis shows that the helical photoconductance is distinct to common
+longitudinal photoconductance and photocurrent phenomena, but consistent with
+the accumulated spins being transported in the side facets of the platelets.
+Our findings demonstrate that spin effects in the facets of 3D topological
+insulators can be addressed and read-out in optoelectronic devices even at room
+temperatures.",1708.00283v1
+2018-03-05,Single-shot readout of hole spins in Ge,"The strong atomistic spin orbit coupling of holes makes single-shot spin
+readout measurements difficult because it reduces the spin lifetimes. By
+integrating the charge sensor into a high bandwidth radio-frequency
+reflectometry setup we were able to demonstrate single-shot readout of a
+germanium quantum dot hole spin and measure the spin lifetime. Hole spin
+relaxation times of about 90 $\mu$s at 500\,mT are reported. By analysing
+separately the spin-to-charge conversion and charge readout fidelities insight
+into the processes limiting the visibilities of hole spins has been obtained.
+The analyses suggest that very high hole visibilities are feasible at realistic
+experimental conditions underlying the potential of hole spins for the
+realization of viable qubit devices.",1803.01775v4
+2018-06-21,Bulk and surface spin conductivity in topological insulators with hexagonal warping,"We investigate the spin conductivity of topological insulators taking into
+account both the surface and quasi-two-dimensional bulk states. We apply a
+low-energy expansion of the Hamiltonian up to the third order in momentum and
+take into account the vertex corrections arising due to the short range
+disorder. Hexagonal warping gives rise to the additional anisotropic components
+in the spin conductivity tensor. Typically, isotropic part of the spin
+conductivity is larger than anisotropic one. The helical regime for the bulk
+states, in which the electrons in the Fermi level have the same projection of
+the spin on the direction of momentum, have been studied in a more detail. In
+this regime, a substantial increase of the spin conductivity contribution from
+the bulk states at the Fermi level is observed. We find that the bulk spin
+conductivity is insensitive to disorder if Rashba spin-orbit coupling is larger
+than disorder strength, otherwise, it is strongly suppressed. The contribution
+to the spin conductivity from the surface states is almost independent of the
+chemical potential, robust to disorder and its value is comparable to the spin
+conductivity contribution from the bulk states per layer. The obtained results
+are in agreement with experimental data.",1806.08257v1
+2021-10-28,Magnus spin Hall and spin Nernst effects in gapped 2D Rashba systems,"We study the Magnus transport in a gapped 2D electron gas with Rashba
+spin-orbit coupling using semiclassical Boltzmann transport formalism. Apart
+from its signature in the charge transport coefficients, the inclusion of
+Magnus velocity in the spin current operator enables us to study Magnus spin
+transport in the system. In particular, we study the roles of mass gap and
+Fermi surface topology on the behavior of Magnus Hall and Nernst conductivities
+and their spin counterparts. We find that the Magnus spin Hall conductivity
+vanishes in the limit of zero gap, unlike the universal spin Hall conductivity
+$\sigma_s=e/(8\pi)$. The Magnus spin currents with spin polarization
+perpendicular to the applied bias (electrical/thermal) are finite while with
+polarization along the bias vanishes. Each Magnus conductivity displays a
+plateau as Fermi energy sweeps through the gap and has peaks (whose magnitudes
+decrease with the gap) when the Fermi energy is at the gap edges.",2110.15282v3
+2017-02-01,Two-Center Gaussian potential well for studying light nucleus in cluster structure,"The clustering phenomena is very important to determine structure of light
+nuclei and deformation of spherical shape is inevitable. Hence, we calculated
+the energy levels of two-center Gaussian potential well including spin-orbit
+coupling by solving the Schr\""odinger equation in the cylindrical coordinates.
+This model could predict the spin and parity of the light nucleus that have
+cluster structure consist of two identical clusters.",1702.00390v1
+1998-05-23,On T-violation signals originating from magnetic orders through double exchange mechanism,"The photon self energy tensor in a crystal with double exchange and
+ferromagnetic or canting magnetic orders is analyzed at zero temperature with
+emphasis on the signal of the time-reversal invariance breaking. Three
+comparable contributions, spin susceptibility, local magnetic field and
+spin-orbit coupling are estimated and the prospect of their experimental
+detection is discussed.",9805303v1
+2010-02-17,Anomalous Hall effects and electron polarizability,"A theory of the anomalous and spin Hall effects, based on the space
+distribution of the current densities, is presented. Spin-orbit coupling gives
+rise to a space separation of the mass centers, as well as a current density
+separation of the quasiparticle states having opposite group velocities. It is
+shown that this microscopic property is essential for existence of both Hall
+effects.",1002.3212v1
+2016-11-22,Relativistic Stern-Gerlach Deflection: Hamiltonian Formulation,"A Hamiltonian formalism is employed to elucidate the effects of the
+Stern-Gerlach force on beams of relativistic spin-polarized particles, for
+passage through a localized region with a static magnetic or electric field
+gradient. The problem of the spin-orbit coupling for nonrelativistic bounded
+motion in a central potential (hydrogen-like atoms, in particular) is also
+briefly studied.",1611.07326v1
+2020-03-12,MagGene: A genetic evolution program for magnetic structure prediction,"We have developed a software MagGene to predict magnetic structures by using
+genetic algorithm. Starting from an atom structure, MagGene repeatedly
+generates new magnetic structures and calls first-principles calculation engine
+to get the most stable structure. This software is applicable to both collinear
+and noncollinear systems. It is particularly convenient for predicting the
+magnetic structures of atomic systems with strong spin-orbit couplings and/or
+strong spin frustrations.",2003.05650v1
+2006-05-09,Electron energy spectrum and density of states for non-symmetric heterostructures in an in-plane magnetic field,"Modifications of spin-splitting dispersion relations and density of states
+for electrons in non-symmetric heterostructures under in-plane magnetic field
+are studied within the envelope function formalism. Spin-orbit interactions,
+caused by both a slow potential and the heterojunction potentials (which are
+described by the boundary conditions) are taken into account. The interplay
+between these contributions and the magnetic field contribution to the
+spin-splitting term in the Hamiltonian is essential when energy amount
+resulting from the Zeeman and spin-orbit coupling are of the same order. Such
+modifications of the energy spectra allow us to separate the spin-orbit
+splitting contributions due to a slow potential and due to the heterojunctions.
+Numerical estimates for selectively-doped heterojunction and quantum well with
+narrow-gap region of electron localization are performed.",0605222v1
+2002-07-23,Classical Mechanics of a Three Spin Cluster,"A cluster of three spins coupled by single-axis anisotropic exchange exhibits
+classical behaviors ranging from regular motion at low and high energies, to
+chaotic motion at intermediate energies. A change of variable, taking advantage
+of the conserved z-angular momentum, combined with a 3-d graphical presentation
+(described in the Appendix), produce Poincare sections that manifest all
+symmetries of the system and clearly illustrate the transition to chaos as
+energy is increased.
+  The three-spin system has four families of periodic orbits. Linearization
+around stationary points predicts orbit periods in the low energy
+(antiferromagnetic) and high energy (ferromagnetic) limits and also determines
+the stability properties of certain orbits at a special intermediate energy.
+The energy surface undergoes interesting changes of topology as energy is
+varied. We describe the similiarities of our three spin system with the
+Anisotropic Kepler Problem and the Henon-Heiles Hamiltonian. An appendix
+discusses numerical integration techniques for spin systems.",0207040v1
+2005-11-05,The spectral form factor for quantum graphs,"We consider quantum graphs with spin-orbit couplings at the vertices.
+Time-reversal invariance implies that the bond S-matrix is in the orthogonal or
+symplectic symmetry class, depending on spin quantum number s being integer or
+half-integer, respectively. The periodic-orbit expansion of the spectral form
+factor is shown to acquire additional weights from spin rotations along orbits.
+We determine the spin contribution to the coefficients in an expansion of the
+form factor from properties of the representation of the group of spin
+transformations on the graph. Consistency with the Circular Orthogonal and
+Circular Symplectic Ensemble, respectively, of random matrices is obtained.",0511011v1
+2011-04-07,Quantum Spin Hall Effect in Silicene,"Recent years have witnessed great interest in the quantum spin Hall effect
+(QSHE) which is a new quantum state of matter with nontrivial topological
+property due to the scientific importance as a novel quantum state and the
+technological applications in spintronics. Taking account of Si, Ge significant
+importance as semiconductor material and intense interest in the realization of
+QSHE for spintronics, here we investigate the spin-orbit opened energy gap and
+the band topology in recently synthesized silicene using first-principles
+calculations. We demonstrate that silicene with topologically nontrivial
+electronic structures can realize QSHE by exploiting adiabatic continuity and
+direct calculation of the Z2 topological invariant. We predict that QSHE in
+silicene can be observed in an experimentally accessible low temperature regime
+with the spin-orbit band gap of 1.55 meV, much higher than that of graphene due
+to large spin-orbit coupling and the low-buckled structure. Furthermore, we
+find that the gap will increase to 2.90 meV under certain pressure strain.
+Finally, we also study germanium with similar low buckled stable structure, and
+predict that SOC opens a band gap of 23.9 meV, much higher than the liquid
+nitrogen temperature.",1104.1290v1
+2011-12-15,Quantitative modeling of spin relaxation in quantum dots,"We use numerically exact diagonalization to calculate the spin-orbit and
+phonon-induced triplet-singlet relaxation rate in a two-electron quantum dot
+exposed to a tilted magnetic field. Our scheme includes a three-dimensional
+description of the quantum dot, the Rashba and the linear and cubic Dresselhaus
+spin-orbit coupling, the ellipticity of the quantum dot, and the full angular
+description of the magnetic field. We are able to find reasonable agreement
+with the experimental results of Meunier et al. [Phys. Rev. Lett. 98, 126601
+(2007)] in terms of the singlet-triplet energy splitting and the spin
+relaxation rate, respectively. We analyze in detail the effects of the
+spin-orbit factors, magnetic-field angles, and the dimensionality, and discuss
+the origins of the remaining deviations from the experimental data.",1112.3562v1
+2015-04-09,Spin responses and effective Hamiltonian for the two dimensional electron gas at oxide interface {LaAlO}$_3$/{SrTiO}$_3$,"Strong Rashba spin-orbit coupling (SOC) of the two-dimensional electron gas
+(2DEG) at the oxide interface $\mathrm{LaAlO_{3}/SrTiO_{3}}$ underlies a
+variety of exotic physics, but its nature is still under debate. We derive an
+effective Hamiltonian for the 2DEG at the oxide interface
+$\mathrm{LaAlO_{3}/SrTiO_{3}}$ and find a different anisotropic Rashba SOC for
+the $d_{xz}$ and $d_{yz}$ orbitals. This anisotropic Rashba SOC leads to
+anisotropic static spin susceptibilities and also distinctive behavior of the
+spin Hall conductivity. These unique spin responses may be used to determine
+the nature of the Rashba SOC experimentally and shed light on the orbital
+origin of the 2DEG.",1504.02177v3
+2015-05-22,Chiral spin-orbital liquids with nodal lines,"Strongly correlated materials with strong spin-orbit coupling hold promise
+for realizing topological phases with fractionalized excitations. Here we
+propose a chiral spin-orbital liquid as a stable phase of a realistic model for
+heavy-element double perovskites. This spin liquid state has Majorana fermion
+excitations with a gapless spectrum characterized by nodal lines along the
+edges of the Brillouin zone. We show that the nodal lines are topological
+defects of a non-Abelian Berry connection and that the system exhibits
+dispersing surface states. We discuss some experimental signatures of this
+state and compare them with properties of the spin liquid candidate Ba_2YMoO_6.",1505.06171v3
+2016-09-15,Ballistic edge states in Bismuth nanowires revealed by SQUID interferometry,"Spin-orbit interactions are known to have drastic effects on the band
+structure of heavy-element-based materials. Celebrated examples are the
+recently identified 3D and 2D topological insulators. In those systems
+transport takes place at surfaces or along edges, and spin-momentum locking
+provides protection against (non-magnetic) impurity scattering, favoring
+spin-polarized ballistic transport. We have used the measurement of the current
+phase relation of a micrometer-long single crystal bismuth nanowire connected
+to superconducting electrodes, to demonstrate that transport occurs
+ballistically along two edges of this high-spin-orbit material. In addition, we
+show that a magnetic field can induce to 0-pi transitions and phi0-junction
+behavior, thanks to the extraordinarily high g-factor and spin orbit coupling
+in this system, providing a way to manipulate the phase of the
+supercurrent-carrying edge states.",1609.04848v1
+2017-03-21,Room temperature spin-orbit torque switching induced by a topological insulator,"Recent studies on the magneto-transport properties of topological insulators
+(TI) have attracted great attention due to the rich spin-orbit physics and
+promising applications in spintronic devices. Particularly the strongly
+spin-moment coupled electronic states have been extensively pursued to realize
+efficient spin-orbit torque (SOT) switching. However, so far current-induced
+magnetic switching with TI has only been observed at cryogenic temperatures. It
+remains a controversial issue whether the topologically protected electronic
+states in TI could benefit spintronic applications at room temperature. In this
+work, we report full SOT switching in a TI/ferromagnet bilayer heterostructure
+with perpendicular magnetic anisotropy at room temperature. The low switching
+current density provides a definitive proof on the high SOT efficiency from TI.
+The effective spin Hall angle of TI is determined to be several times larger
+than commonly used heavy metals. Our results demonstrate the robustness of TI
+as an SOT switching material and provide a direct avenue towards applicable
+TI-based spintronic devices.",1703.07470v1
+2018-02-05,First-principles theory of giant Rashba-like spin-splitting in bulk ferroelectrics,"Recently large Rashba-like spin splitting has been observed in certain bulk
+ferroelectrics. In contrast with the relativistic Rashba effect, the chiral
+spin texture and large spin-splitting of the electronic bands depend strongly
+on the character of the band and atomic spin-orbit coupling. We establish that
+this can be traced back to the so-called orbital Rashba effect, also in the
+bulk. This leads to an additional dependence on the orbital composition of the
+bands, which is crucial for a complete picture of the effect. Results from
+first-principles calculations on ferroelectic GeTe verify the key predictions
+of the model.",1802.01546v3
+2014-03-24,Spin-orbit and impurity scattering in an integrable electron model: Exact results for dynamic correlations,"We introduce an integrable model of spin-polarized interacting electrons
+subject to a spin-conserving spin-orbit interaction. Using Bethe Ansatz and
+conformal field theory we calculate the exact large-time single-electron and
+density correlations and find that while the spin-orbit interaction enhances
+the single-electron Green's function, the density correlations get suppressed.
+Adding a localized impurity and coupling it to the electrons so that
+integrability is preserved, the dynamic correlations are found to change
+significantly after a quantum quench with the impurity interaction switched on
+suddenly. When the electrons are confined to a periodic structure, the
+correlations are indifferent to the location of the impurity and only carry an
+imprint of its intrinsic properties. We conjecture that this unusual feature
+originates from the integrability of the model.",1403.6091v2
+2017-06-15,The low-temperature highly correlated quantum phase in the charge-density-wave 1T-TaS_2 compound,"A prototypical quasi-2D metallic compound, 1T-TaS_2 has been extensively
+studied due to an intricate interplay between a Mott-insulating ground state
+and a charge density-wave (CDW) order. In the low-temperature phase, 12 out of
+13 Ta_{4+} 5\textit{d}-electrons form molecular orbitals in hexagonal
+star-of-David patterns, leaving one 5\textit{d}-electron with \textit{S} = 1/2
+spin free. This orphan quantum spin with a large spin-orbit interaction is
+expected to form a highly correlated phase of its own. And it is most likely
+that they will form some kind of a short-range order out of a strongly
+spin-orbit coupled Hilbert space. In order to investigate the low-temperature
+magnetic properties, we performed a series of measurements including neutron
+scattering and muon experiments. The obtained data clearly indicate the
+presence of the short-ranged phase and put the upper bound on ~ 0.4
+\textit{\mu}_B for the size of the magnetic moment, consistent with the
+orphan-spin scenario.",1706.04735v1
+2018-06-05,Multi-orbital nature of the spin fluctuations in Sr$_2$RuO$_4$,"The spin susceptibility of strongly correlated Sr$_2$RuO$_4$ is known to
+display a rich structure in reciprocal space, with a prominent peak at ${\bf
+Q}_i$=$(0.3,0.3,0)$. It is still debated if the resulting incommensurate
+spin-density-wave fluctuations foster unconventional superconductivity at low
+temperature or compete therewith. By means of density functional theory
+combined with dynamical mean-field theory, we reveal the realistic
+multi-orbital signature of the (dynamic) spin susceptibility beyond existing
+weak-coupling approaches. The experimental fluctuation spectrum up to 80 meV is
+confirmed by theory. Furthermore, the peak at ${\bf Q}_i$ is shown to carry
+nearly equal contributions from each of the Ru$(4d)$-$t_\mathrm{2g}$ orbitals,
+pointing to a cooperative effect resulting in the dominant spin fluctuations.",1806.01511v2
+2018-08-02,Orbital- and spin-driven lattice instabilities in quasi-one-dimensional CaV$_2$O$_4$,"Calcium vanadate CaV$_2$O$_4$ has a crystal structure of
+quasi-one-dimensional zigzag chains composed of orbital-active V$^{3+}$ ions
+and undergoes successive structural and antiferromagnetic phase transitions at
+$T_s\sim 140$ K and $T_N \sim 70$ K, respectively. We perform ultrasound
+velocity measurements on a single crystal of CaV$_2$O$_4$. The temperature
+dependence of its shear elastic moduli exhibits huge Curie-type softening upon
+cooling that emerges above and below $T_s$ depending on the elastic mode. The
+softening above $T_s$ suggests the presence of either onsite Jahn-Teller-type
+or intersite ferro-type orbital fluctuations in the two inequivalent V$^{3+}$
+zigzag chains. The softening below $T_s$ suggests the occurrence of a
+dimensional spin-state crossover, from quasi-one to three, that is driven by
+the spin-lattice coupling along the inter-zigzag-chain orthogonal direction.
+The successive emergence of the orbital- and spin-driven lattice instabilities
+above and below $T_s$, respectively, is unique to the orbital-spin zigzag chain
+system of CaV$_2$O$_4$.",1808.00642v1
+2022-08-30,Spinor superfluid currents of exciton-polaritons on a split-ring,"Recently, split-ring bosonic condensates of exciton polaritons have been
+proposed for realisation of qubits. We formulate an analytical model of a
+polariton condensate in a one-dimensional ring split by a delta-function
+potential. The persistent current is stopped by the potential defect embedded
+in a scalar condensate of non-interacting particles, however, it reappears in
+the presence of an up-critical non-linearity. The nonlinear supercurrents are
+characterised by fractional orbital momenta while their eigenfunctions may
+feature grey or dark solitons. The coupling between the spin and the orbital
+angular momentum of a spinor condensate affects persistent currents crucially.
+We show that the spin-orbit interaction (SOI) induces the net superfluid
+current in the condensate with a spatially uniform spin polarisation. We also
+find solutions where the SOI-induced currents of two spin components of the
+condensate propagate in opposite directions. The corresponding states of spinor
+condensates obey a combined mirror reflection and the spin-flip symmetry.",2208.14094v2
+2023-10-09,Ordered phases and superconductivity in two-dimensional electron systems subject to pair spin-orbit interaction,"Pair spin-orbit interaction can emerge in strongly-interacting systems
+characterized by a large spin-orbit coupling. Here we study the role of this
+interaction in stabilizing ordered and unconventional superconducting phases.
+We find that, if the system avoids superconductivity, the order realized is a
+combination of charge-density and spin-vorticity waves. The latter is
+reminiscent of a loop-current state, albeit in the spin, rather in the charge,
+channel. If the system becomes superconducting, the order parameter assumes the
+form of a paired density wave, i.e. pairing occurs at finite momentum.
+Intriguingly, one of the possible pairings acquires a form analogous to
+Amperean superconductivity. However, the order parameter here is always a blend
+of paired density wave and Amperean pairing, rather than being purely one or
+the other.",2310.06190v1
+2024-02-09,g-factor symmetry and topology in semiconductor band states,"The $\bf{g}$ tensor, which determines the reaction of Kramers-degenerate
+states to an applied magnetic field, is of increasing importance in the current
+design of spin qubits. It is affected by details of heterostructure
+composition, disorder, and electric fields, but it inherits much of its
+structure from the effect of the spin-orbit interaction working at the
+crystal-lattice level. Here we uncover new symmetry and topological features of
+$\bf{g}=\bf{g}_L+\bf{g}_S$ for important valence and conduction bands in
+silicon, germanium, and gallium arsenide. For all crystals with high (cubic)
+symmetry, we show that large departures from the nonrelativistic value $g=2$
+are {\em guaranteed} by symmetry. In particular, considering the spin part
+$\bf{g}_S(\bf{k})$, we prove that the scalar function $det(\bf{g}_S(\bf{k}))$
+must go to zero on closed surfaces in the Brillouin zone, no matter how weak
+the spin-orbit coupling is. We also prove that for wave vectors $\bf{k}$ on
+these surfaces, the Bloch states $|u_{n\bf{k}}\rangle$ have maximal
+spin-orbital entanglement. Using tight-binding calculations, we observe that
+the surfaces $det(\bf{g}(\bf{k}))=0$ exhibit many interesting topological
+features, exhibiting Lifshitz critical points as understood in Fermi-surface
+theory.",2402.06310v1
+2003-05-14,Orbital order in the low-dimensional quantum spin system TiOCl probed by ESR,"We present electron spin resonance data of Ti$^{3+}$ (3$d^1$) ions in single
+crystals of the novel layered quantum spin magnet TiOCl. The analysis of the g
+tensor yields direct evidence that the d_{xy} orbital from the t_{2g} set is
+predominantly occupied and owing to the occurrence of orbital order a linear
+spin chain forms along the crystallographic b axis. This result corroborates
+recent theoretical LDA+U calculations of the band structure. The temperature
+dependence of the parameters of the resonance signal suggests a strong coupling
+between spin and lattice degrees of freedom and gives evidence for a transition
+to a nonmagnetic ground state at 67 K.",0305317v2
+2007-10-04,From spin and orbital SU(4) to spin SU(2) Kondo effect in double quantum dot,"We consider spin and orbital Kondo effect in a parallel arrangement of two
+strongly electrostatically coupled quantum dots. Increasing the exchange of
+electrons between the dots through the attached leads induces a smooth
+crossover between SU(4) spin- and orbital Kondo effect and SU(2) spin Kondo
+effect. Being the same for the SU(4) and SU(2) symmetry points, the Kondo
+temperature drops slightly in the intermediate regime. Experimentally, two
+kinds of Kondo effect can be discriminated by the sensitivity to the
+suppression of the spin Kondo effect by Zeeman field. The dependence of the
+Kondo temperature and of the differential conductance on the strength of
+electronic exchange through the leads and Zeeman field is analyzed in detail.",0710.0950v2
+2008-08-22,Perturbation Method for Classical Spinning Particle Motion: II. Vaidya Space-Time,"This paper describes an application of the Mathisson-Papapetrou-Dixon (MPD)
+equations in analytic perturbation form to the case of circular motion around a
+radially accreting or radiating black hole described by the Vaidya metric.
+Based on the formalism presented earlier, this paper explores the effects of
+mass accretion or loss of the central body on the overall dynamics of the
+orbiting spinning particle. This includes changes to its squared mass and spin
+magnitude due to the classical analog of radiative corrections from
+spin-curvature coupling. Various quantitative consequences are explored when
+considering orbital motion near the black hole's event horizon. An analysis on
+the orbital stability properties due to spin-curvature interactions is examined
+briefly, with conclusions in general agreement with previous work performed for
+the case of circular motion around a Kerr black hole.",0808.3006v3
+2012-08-13,Magnetic Dipole and Electric Quadrupole Transitions in the Trivalent Lanthanide Series: Calculated Emission Rates and Oscillator Strengths,"Given growing interest in optical-frequency magnetic dipole transitions, we
+use intermediate coupling calculations to identify strong magnetic dipole
+emission lines that are well suited for experimental study. The energy levels
+for all trivalent lanthanide ions in the 4fn configuration are calculated using
+a detailed free ion Hamiltonian, including electrostatic and spin-orbit terms
+as well as two-body, three-body, spin-spin, spin-other-orbit, and
+electrostatically correlated spin-orbit interactions. These free ion energy
+levels and eigenstates are then used to calculate the oscillator strengths for
+all ground-state magnetic dipole absorption lines and the spontaneous emission
+rates for all magnetic dipole emission lines including transitions between
+excited states. A large number of strong magnetic dipole transitions are
+predicted throughout the visible and near-infrared spectrum, including many at
+longer wavelengths that would be ideal for experimental investigation of
+magnetic light-matter interactions with optical metamaterials and plasmonic
+antennas.",1208.2642v2
+2018-12-08,Competing superconducting phases in interacting two-dimensional electron gas with strong Rashba spin-orbit coupling,"In this work we study interacting electrons on square lattice in the presence
+of strong Rashba spin-orbit interaction. The spin-orbit term forces the
+time-reversal electron states to be paired in even Cooper channels. For
+concreteness, we only consider the repulsive onsite Hubbard and
+nearest-neighbor coulomb interactions, the so called extended Hubbard model. To
+examine the superconducting instability we obtain the effective interaction
+between electrons within the random phase approximation and treat the pairing
+instabilities driven by charge and spin fluctuations and their combined
+effects. We mapped out the phase diagram of the model in terms of interactions
+and electron fillings, and found that while the $d_{xy}$ and $d_{x^2-y^2}$
+symmetries are the most likely pairing symmetries driven by charge and spin
+fluctuations, respectively, the strong effect of both fluctuations yields
+higher angular momentum Cooper instability. The possibility of topological
+superconductivity and triplet pairing is also discussed.",1812.03316v1
+2019-07-09,Tunneling anisotropic magnetoresistance of Pb and Bi adatoms and dimers on Mn/W(110): A first-principles study,"We show that Pb and Bi adatoms and dimers have a large tunneling anisotropic
+magnetoresistance (TAMR) of up to 60% when adsorbed on a magnetic
+transition-metal surface due to strong spin-orbit coupling and the
+hybridization of 6p orbitals with 3d states of the magnetic layer. Using
+density functional theory, we have explored the TAMR effect of Pb and Bi
+adatoms and dimers adsorbed on a Mn monolayer on W(110). This surface exhibits
+a noncollinear cycloidal spin spiral ground state with an angle of 173$^\circ$
+between neighboring spins which allows to rotate the spin quantization axis of
+an adatom or dimer quasi-continuously and is ideally suited to explore the
+angular dependence of TAMR using scanning tunneling microscopy (STM). We find
+that the induced magnetic moments of Pb and Bi adatoms and dimers are small,
+however, the spin-polarization of the local density of states (LDOS) is still
+very large. The TAMR obtained from the anisotropy of the vacuum LDOS is up to
+50-60 % for adatoms. For dimers the TAMR depends sensitively on the dimer
+orientation with respect to the crystallographic directions of the surface due
+to the formation of bonds between the adatoms with the Mn surface atoms and the
+symmetry of the spin-orbit coupling induced mixing. Dimers oriented along the
+spin spiral direction of the Mn monolayer display the largest TAMR of 60 %
+which is due to hybrid 6p-3d states of the dimers and the Mn layer",1907.04363v1
+2019-09-23,Josephson junctions with spin-orbit and spin-flip interactions,"In this thesis we study short Josephson junctions which include a region with
+Rashba spin-orbit coupling effect. Our junctions consists of two
+superconductors (S) and a 2-dimensional electron gas (2DEG) layer between them:
+S/2DEG/S junction. We also include two thin insulating interfaces between the
+superconductors and the 2DEG, which are capable of both normal and spin-flip
+scattering. The junctions we study are assumed to be in the ballistic limit and
+so, we do not consider the effects of impurities. The basic equations we use
+for our model are the Bogoliubov-de Gennes equations. We give particular
+emphasis in the relation between the supercurrent of the junction as a function
+of difference of the phase parameters of the two superconductors. We study
+thoroughly how this relation differs to the change of the junction's length,
+the spin-orbit coupling constant, the normal scattering strength and the
+spin-flip scattering strength and direction. We are also interested in the
+0-$\pi$ transition and the second harmonic appearance, as well as the
+symmetries which occur in the current-phase relation, for different geometries
+of the two spin-flip interfaces. In addition, we show how the Critical current
+of our junction is affected to the change of the above parameters and under
+which conditions it is optimized. Finally, we study the supercurrent flowing at
+zero phase difference (ZPC) of the two superconductors. We emphasize the
+conditions under which it is non-zero and also examine the cases it becomes
+maximized.",1909.10617v2
+2020-06-16,Block orbital-selective Mott insulators: a spin excitation analysis,"We present a comprehensive study of the spin excitations - as measured by the
+dynamical spin structure factor $S(q,\omega)$ - of the so-called block-magnetic
+state of low-dimensional orbital-selective Mott insulators. We realize this
+state via both a multi-orbital Hubbard model and a generalized Kondo-Heisenberg
+Hamiltonian. Due to various competing energy scales present in the models, the
+system develops periodic ferromagnetic islands of various shapes and sizes,
+which are antiferromagnetically coupled. The 2$\times$2 particular case was
+already found experimentally in the ladder material BaFe$_2$Se$_3$ that becomes
+superconducting under pressure. Here we discuss the electronic density as well
+as Hubbard and Hund coupling dependence of $S(q,\omega)$ using density matrix
+renormalization group method. Several interesting features were identified: (1)
+An acoustic (dispersive spin-wave) mode develops. (2) The spin-wave bandwidth
+establishes a new energy scale that is strongly dependent on the size of the
+magnetic island and becomes abnormally small for large clusters. (3) Optical
+(dispersionless spin excitation) modes are present for all block states studied
+here. In addition, a variety of phenomenological spin Hamiltonians have been
+investigated but none matches entirely our results that were obtained primarily
+at intermediate Hubbard $U$ strengths. Our comprehensive analysis provides
+theoretical guidance and motivation to crystal growers to search for
+appropriate candidate materials to realize the block states, and to neutron
+scattering experimentalists to confirm the exotic dynamical magnetic properties
+unveiled here, with a rich mixture of acoustic and optical features.",2006.09495v2
+2020-11-23,Response of a strongly interacting spin-orbit coupling system to a Zeeman field,"A strongly spin-orbital coupled systems could be in a magnetic ordered phase
+at zero field. However, a Zeeman field could drive it into different quantum or
+topological phases. In this work, starting from general symmetry principle, we
+construct various effective actions to study all these quantum phases and phase
+transitions which take different forms depending on the condensation momenta
+are commensurate or in-commensurate.
+  We not only recover all these quantum phases and their excitations achieved
+by the microscopic calculations, but also discover several novel classes of
+quantum phase transitions with dynamic exponents $ z=1, z=2 $ and anisotropic
+ones $ (z_x=3/2, z_y=3) $ respectively. We determine the relations between the
+quantum spin and the order parameters of the effective actions which display
+rich spin-orbital structures. We find a new type of dangerously irrelevant
+operator we name type-II, in distinction from the known one we name type-I. We
+explore a new phenomena called order parameter fractionization where one
+complex order parameter split into two which is different than quantum spin
+fractionization into a spinon and a $ Z_2 $ flux. Finite temperature
+transitions are presented. The dynamic spin-spin correlation functions are
+evaluated. Thermal Hall conductivities are discussed. The cases with the $
+U(1)_{soc} $ symmetry explicitly broken are briefly outlined. In view of recent
+experimental advances in generating 2d SOC for cold atoms in optical lattices,
+these new many-body phenomena can be explored in the near future cold atom
+experiments. Implications to various SOC materials such as MnSi,
+Fe$_{0.5}$Co$_{0.5}$Si, especially 4d Kitaev materials $\alpha$-RuCl$_3$ in a
+Zeeman field are outlined.",2011.11287v2
+2021-11-22,Ensemble spin relaxation of shallow donor qubits in ZnO,"We present an experimental and theoretical study of the longitudinal electron
+spin relaxation ($T_1$) of shallow donors in the direct band-gap semiconductor
+ZnO. $T_1$ is measured via resonant excitation of the Ga donor-bound exciton.
+$T_1$ exhibits an inverse-power dependence on magnetic field $T_1\propto
+B^{-n}$, with $4\leq n\leq 5$, over a field range of 1.75 T to 7 T. We derive
+an analytic expression for the donor spin-relaxation rate due to spin-orbit
+(admixture mechanism) and electron-phonon (piezoelectric) coupling for the
+wurtzite crystal symmetry. Excellent quantitative agreement is found between
+experiment and theory suggesting the admixture spin-orbit mechanism is the
+dominant contribution to $T_1$ in the measured magnetic field range.
+Temperature and excitation-energy dependent measurements indicate a donor
+density dependent interaction may contribute to small deviations between
+experiment and theory. The longest $T_1$ measured is 480 ms at 1.75 T with
+increasing $T_1$ at smaller fields theoretically expected. This work highlights
+the extremely long longitudinal spin-relaxation time for ZnO donors due to
+their small spin-orbit coupling.",2111.11564v3
+2019-08-28,Tilting Ice Giants with a Spin-Orbit Resonance,"Giant collisions can account for Uranus's and Neptune's large obliquities,
+yet generating two planets with widely different tilts and strikingly similar
+spin rates is a low-probability event. Trapping into a secular spin-orbit
+resonance, a coupling between spin and orbit precession frequencies, is a
+promising alternative, as it can tilt the planet without altering its spin
+period. We show with numerical integrations that if Uranus harbored a massive
+circumplanetary disk at least three times the mass of its satellite system
+while it was accreting its gaseous atmosphere, then its spin precession rate
+would increase enough to resonate with its own orbit, potentially driving the
+planet's obliquity to 70${^\circ}$. We find that the presence of a massive disk
+moves the Laplace radius significantly outward from its classical value,
+resulting in more of the disk contributing to the planet's pole precession.
+Although we can generate tilts greater than 70${^\circ}$ only rarely and cannot
+drive tilts beyond 90${^\circ}$, a subsequent collision with an object about
+$0.5\,M_{\oplus}$ could tilt Uranus from 70${^\circ}$ to 98${^\circ}$.
+Minimizing the masses and number of giant impactors from two or more to just
+one increases the likelihood of producing Uranus's spin states by about an
+order of magnitude. Neptune, by contrast, needs a less massive disk to explain
+its 30${^\circ}$ tilt, eliminating the need for giant collisions altogether.",1908.10969v4
+2022-09-21,Ferroaxial moment induced by vortex spin texture,"The nature of an electric ferro-axial moment characterizing a
+time-reversal-even axial-vector quantity is theoretically investigated under
+magnetic orderings. We clarify that a vortex spin texture results in the
+emergence of the ferro-axial moment depending on the helicity. By introducing a
+multipole description, we show that the ferro-axial nature appears when two
+types of odd-parity magnetic multipoles become active under the vortex spin
+texture: One is the magnetic monopole and the other is the magnetic toroidal
+dipole. We present all the magnetic point groups to possess the ferro-axial
+moment in the presence of the magnetic orderings with the magnetic monopole and
+magnetic toroidal dipole. Moreover, we specifically consider a multi-orbital
+model in a four-sublattice tetragonal system to demonstrate the ferro-axial
+moment induced by the vortex spin texture. We show that the ferro-axial moment
+is microscopically characterized by both the cluster-scale and atomic-scale
+axial-vector quantities: The former is described by the vortex of the local
+electric dipole and the latter is represented by the outer product of the local
+orbital and spin angular momenta. Moreover, we find that the atomic-spin orbit
+coupling and the hybridization between orbitals with different parity are key
+ingredients to induce the ferro-axial moment. We also apply the result to a
+magnetic skyrmion with a topologically-nontrivial spin texture and discuss
+candidate materials.",2209.10657v2
+2023-01-24,Orbital antiferroelectricity and higher dimensional magnetoelectric order in the spin-$1/2$ XX chain extended with three-spin interactions,"We study the spin-1/2 XX model extended with three-spin interactions of the
+XZX+YZY and XZY-YZX types. We solve the model exactly and obtain the ground
+state phase diagram as a function of the two three-spin coupling strengths. We
+show that even in absence of external electric and magnetic fields there is a
+phase which exhibits spontaneous magnetoelectric order when both XZX+YZY and
+XZY-YZX interactions are present. Specifically, in this regime, we show that
+there exists not only a non-zero magnetization and a scalar chirality but also
+a vector chiral order. Further, we show the existence of a plaquette vector
+chirality, or circulating chiral spin current loops, in the plaquettes n, n+1,
+n+2 with the sense of the current being opposite in adjacent plaquettes.
+Analogous to charge current loops giving rise to orbital magnetic dipole
+moments, the circulating spin current loops give rise to orbital electric
+dipole moments - a novel orbital antiferroelectricity. We characterize this
+phase by a higher-dimensional scalar and vector toroidal order. Such a novel
+phase with higher dimensional order arises because of the non-trivial
+topological connectivity resulting from the presence of both the three-spin
+interactions. We also study the combined effect of both types of three-spin
+interactions on the entanglement entropy.",2301.10138v1
+2019-08-12,Uncovering Non-Fermi-Liquid Behavior in Hund Metals: Conformal Field Theory Analysis of an SU(2)$\times$SU(3) Spin-Orbital Kondo Model,"Hund metals have attracted attention in recent years due to their
+unconventional superconductivity, which supposedly originates from
+non-Fermi-liquid (NFL) properties of the normal state. When studying Hund
+metals using dynamical mean-field theory, one arrives at a self-consistent
+""Hund impurity problem"" involving a multiorbital quantum impurity with nonzero
+Hund coupling interacting with a metallic bath. If its spin and orbital degrees
+of freedom are screened at different energy scales, $T_\mathrm{sp} <
+T_\mathrm{orb}$, the intermediate energy window is governed by a novel NFL
+fixed point, whose nature had not yet been clarified. We resolve this problem
+by providing an analytical solution of a paradigmatic example of a Hund
+impurity problem, involving two spin and three orbital degrees of freedom. To
+this end, we combine a state-of-the-art implementation of the numerical
+renormalization group, capable of exploiting non-Abelian symmetries, with a
+generalization of Affleck and Ludwig's conformal field theory (CFT) approach
+for multichannel Kondo models. We characterize the NFL fixed point of Hund
+metals in detail for a Kondo model with an impurity forming an
+SU(2)$\times$SU(3) spin-orbital multiplet, tuned such that the NFL energy
+window is very wide. The impurity's spin and orbital susceptibilities then
+exhibit striking power-law behavior, which we explain using CFT arguments. We
+find excellent agreement between CFT predictions and numerical renormalization
+group results. Our main physical conclusion is that the regime of spin-orbital
+separation, where orbital degrees of freedom have been screened but spin
+degrees of freedom have not, features anomalously strong local spin
+fluctuations: the impurity susceptibility increases as
+$\chi_\mathrm{sp}^\mathrm{imp} \sim \omega^{-\gamma}$, with $\gamma > 1$.",1908.04362v2
+2022-09-19,Andreev bound states at boundaries of polarized 2D Fermi superfluids with s-wave pairing and spin-orbit coupling,"A topological superfluid phase characterized by an emergent chiral-p-wave
+pair potential is expected to form in a two-dimensional Fermi superfluid
+subject to s-wave pairing, spin-orbit coupling and a large-enough Zeeman
+splitting. Andreev bound states appear at phase boundaries, including Majorana
+zero modes whose existence is assured by the bulk-boundary correspondence
+principle. Here we study the physical properties of these subgap-energy bound
+states at step-like interfaces using the spin-resolved Bogoliubov-deGennes
+mean-field formalism and assuming small spin-orbit coupling. Extending a
+recently developed spin-projection technique based on Feshbach partitioning
+[SciPost Phys. 5, 016 (2018)] combined with the Andreev approximation allows us
+to obtain remarkably simple analytical expressions for the bound-state energies
+as well as the majority and minority spin components of their wave functions.
+Besides the vacuum boundary, where a majority-spin Majorana excitation is
+encountered, we also consider the boundary between the topological and a
+nontopological superfluid phase that can appear in a coexistence scenario due
+to the first-order topological phase transition predicted for this system. At
+this superfluid-superfluid interface, we find a localized chiral Majorana mode
+hosted by the minority-spin sector. Our theory further predicts majority-spin
+subgap-energy bound states similar to those found at a Josephson junction
+between same-chirality p-wave superfluids. Their presence affects the Majorana
+mode due to a coupling of minority and majority spin sectors only in the small
+energy range where their spectra overlap. Our results may inform experimental
+efforts aimed at realizing and characterizing unconventional Majorana
+quasiparticles.",2209.08766v2
+2008-12-21,Spatial fluctuations of spin and orbital in two-orbital Hubbard model,"We investigate the quasiparticle dynamics in the two-orbital Hubbard model on
+the square lattice at quarter filling by means of the cellular dynamical mean
+field theory. We show that the Fermi-liquid state is stabilized up to the large
+Hubbard interactions in the symmetric case without the Hund's coupling, and
+find the heavy quasiparticles around the metal-insulator boundary. It is
+elucidated that the Hund's coupling enhances the antiferro-orbital
+correlations, which give rise to the pseudo gap behavior in the single-particle
+excitations. We also find the nonmonotonic temperature dependence in the
+quasiparticle dynamics for intermediate strength of the Hund's coupling, and
+clarify that it is caused by the competition between the Fermi-liquid formation
+and the antiferro-orbital fluctuations.",0812.4019v2
+2009-02-04,Theory of valley-orbit coupling in a Si/SiGe quantum dot,"Electron states are studied for quantum dots in a strained Si quantum well,
+taking into account both valley and orbital physics. Realistic geometries are
+considered, including circular and elliptical dot shapes, parallel and
+perpendicular magnetic fields, and (most importantly for valley coupling) the
+small local tilt of the quantum well interface away from the crystallographic
+axes. In absence of a tilt, valley splitting occurs only between pairs of
+states with the same orbital quantum numbers. However, tilting is ubiquitous in
+conventional silicon heterostructures, leading to valley-orbit coupling. In
+this context, ""valley splitting"" is no longer a well defined concept, and the
+quantity of merit for qubit applications becomes the ground state gap. For
+typical dots used as qubits, a rich energy spectrum emerges, as a function of
+magnetic field, tilt angle, and orbital quantum number. Numerical and
+analytical solutions are obtained for the ground state gap and for the mixing
+fraction between the ground and excited states. This mixing can lead to valley
+scattering, decoherence, and leakage for Si spin qubits.",0902.0777v3
+2019-08-22,Nonequilibrium Orbital Transitions via Applied Electrical Current in Calcium Ruthenate,"Simultaneous control of structural and physical properties via applied
+electrical current poses a key, new research topic and technological
+significance. Studying the spin-orbit-coupled antiferromagnet Ca2RuO4, with 3%
+Mn doping to weaken the violent first-order transition at 357 K for more robust
+measurements, we find that a small applied electrical current couples to the
+lattice by significantly reducing its orthorhombicity and octahedral rotations,
+concurrently diminishing the 125 K- antiferromagnetic transition and inducing a
+new, orbital order below 80 K. Our effort to establish a phase diagram reveals
+a critical regime near a current density of 0.15 A/cm2 that separates the
+vanishing antiferromagnetic order and the new orbital order. Further increasing
+current density (> 1 A/cm2) enhances competitions between relevant interactions
+in a metastable manner, leading to a peculiar glassy behavior above 80 K. The
+coupling between the lattice and nonequilibrium driven current is interpreted
+theoretically in terms of t2g orbital occupancies. The current-controlled
+lattice is the driving force of the observed novel phenomena.",1908.08571v3
+2020-07-23,Coupled Yu-Shiba-Rusinov states induced by a many-body molecular spin on a superconductor,"A magnetic impurity on a superconductor induces Yu-Shiba-Rusinov (YSR) bound
+states, detected by tunneling spectroscopy as long-lived quasiparticle
+excitations inside the superconducting gap. Coupled YSR states constitute basic
+elements to engineer artificial superconducting states, but their
+substrate-mediated interactions are generally weak. In this paper, we report
+that intramolecular (Hund's like) exchange interactions produce coupled YSR
+states across a molecular platform. We measured YSR spectra along a magnetic
+iron-porphyrin on Pb(111) and found evidences of two orbital interaction
+channels, which invert their particle-hole asymmetry across the molecule.
+Numerical calculations show that the identical YSR asymmetry pattern of the two
+channels is caused by two spin-hosting orbitals with opposite potential
+scattering and coupled strongly. Both channels can be similarly excited by
+tunneling electrons into each orbital, depicting a new scenario for entangled
+superconducting bound states using molecular platforms.",2007.12091v2
+2017-01-23,Determination of Hund's coupling in 5d Oxides using Resonant Inelastic X-ray Scattering,"We report resonant inelastic X-ray scattering (RIXS) measurements on ordered
+double perovskite samples containing Re$^{5+}$ and Ir$^{5+}$ with $5d^2$ and
+$5d^4$ electronic configurations respectively. In particular, the observed RIXS
+spectra of Ba$_2$YReO$_6$ and Sr$_2$MIrO$_6$ (M=Y, Gd) show sharp
+intra-t$_{2g}$ transitions, which can be quantitatively understood using a
+minimal `atomic' Hamiltonian incorporating spin-orbit coupling ($\lambda$) and
+Hund's coupling ($J_H$). Our analysis yields $\lambda=0.38(2)$eV with
+$J_H=0.26(2)$eV for Re$^{5+}$, and $\lambda=0.42(2)$eV with $J_H=0.25(4)$eV for
+Ir$^{5+}$. Our results provide the first sharp estimates for the Hund's
+coupling in $5d$ oxides, and suggest that it should be treated on equal footing
+with spin-orbit interaction in multi-orbital $5d$ transition metal compounds.",1701.06584v3
+2019-10-02,Proximity induced spin orbit effects in graphene on Au,"We introduce a $p_{z}-d$ coupling model Hamiltonian for the $\pi$-graphene/Au
+bands that predicts a rather large intrinsic spin-orbit (SO) coupling as are
+being reported in recent experiments and DFT studies. Working within the
+analytical Slater-Koster tight-binding approach we were able to identify the
+overlapping orbitals of relevance in the enhancement of the SO coupling for
+both, the sublattice symmetric (BC), and the ATOP (AC) stacking configurations.
+Our model effective Hamiltonian reproduces quite well the experimental spectrum
+for the two registries, and in addition, its shows that the hollow site
+configuration (BC), in which the A/B sites remain symmetric, yields the larger
+increase of the SO coupling. We also explore the Au-diluted case keeping the BC
+configuration and showed that it renders the preservation of the SO-gap with a
+similar SO interaction enhancement as the undiluted case but with a smaller
+graphene-gold distance.",1910.01110v1
+2011-08-30,Orbital ordering in the geometrically frustrated MgV$_2$O$_4$: \emph{Ab initio} electronic structure calculations,"In the light of recent interesting experimental work on MgV$_2$O$_4$ we
+employ the density functional theory to investigate the crucial role played by
+different interaction parameters in deciding its electronic and magnetic
+properties. The strong Coulomb correlation in presence of antiferromagnetic
+(AFM) coupling is responsible for the insulating ground state. In the ground
+state the $d_{xz}$ and $d_{yz}$ orbitals are ordered and intra-chain vanadium
+ions are antiferromagnetically coupled. The calculation gives small spin-orbit
+coupling (SOC), which provides a tilt of $\sim11.3^0$ to the magnetic moment
+from the z-axis. In the presence of weak SOC and strong exchange coupling, the
+experimentally observed small magnetic moment and low AFM transition
+temperature appear to arise from spin fluctuation due to activeness of
+geometrical frustration.",1108.5907v2
+2017-05-24,Pairing Tendencies in a Two-orbital Hubbard Model in One Dimension,"The recent discovery of superconductivity under high pressure in the ladder
+compound BaFe$_2$S$_3$ has opened a new field of research in iron-based
+superconductors with focus on quasi one-dimensional geometries. In this
+publication, using the Density Matrix Renormalization Group technique, we study
+a two-orbital Hubbard model defined in one dimensional chains. Our main result
+is the presence of hole binding tendencies at intermediate Hubbard $U$
+repulsion and robust Hund coupling $J_H/U=0.25$. Binding does not occur neither
+in weak coupling nor at very strong coupling. The pair-pair correlations that
+are dominant near half-filling, or of similar strength as the charge and spin
+correlation channels, involve hole-pair operators that are spin singlets, use
+nearest-neighbor sites, and employ different orbitals for each hole. The Hund
+coupling strength, presence of robust magnetic moments, and antiferromagnetic
+correlations among them are important for the binding tendencies found here.",1705.08780v2
+2016-01-29,Weak-coupling superconductivity in a strongly correlated iron pnictide,"Iron-based superconductors have been found to exhibit an intimate interplay
+of orbital, spin, and lattice degrees of freedom, dramatically affecting their
+low-energy electronic properties, including superconductivity. Albeit the
+precise pairing mechanism remains unidentified, several candidate interactions
+have been suggested to mediate the superconducting pairing, both in the orbital
+and in the spin channel. Here, we employ optical spectroscopy (OS),
+angle-resolved photoemission spectroscopy (ARPES), ab initio band-structure,
+and Eliashberg calculations to show that nearly optimally doped
+NaFe$_{0.978}$Co$_{0.022}$As exhibits some of the strongest orbitally selective
+electronic correlations in the family of iron pnictides. Unexpectedly, we find
+that the mass enhancement of itinerant charge carriers in the strongly
+correlated band is dramatically reduced near the $\Gamma$ point and attribute
+this effect to orbital mixing induced by pronounced spin-orbit coupling.
+Embracing the true band structure allows us to describe all low-energy
+electronic properties obtained in our experiments with remarkable consistency
+and demonstrate that superconductivity in this material is rather weak and
+mediated by spin fluctuations.",1601.08195v1
+2023-04-07,Electron confinement in chain-doped TMDs: A platform for spin-orbit coupled 1D physics,"The state-of-the-art defect engineering techniques have paved the way to
+realize novel quantum phases out of pristine materials. Here, through
+density-functional calculations and model studies, we show that the chain-doped
+monolayer transition metal dichalcogenides (TMDs), where M atoms on a single
+the zigzag chains are replaced by a higher-valence transition-metal element
+M$^\prime$ (MX$_2$/M$^\prime$), exhibit one-dimensional (1D) bands. These 1D
+bands, occurring in the fundamental gap of the pristine material, are
+dispersive along the doped chain but are strongly confined along the lateral
+direction. This confinement occurs as the bare potential of the dopant chain
+formed by the positively charged M$^\prime$ ions resembles the potential well
+of a uniformly charged wire. These bands could show novel 1D physics, including
+a new type of Tomonaga-Luttinger liquid behavior, multi-orbital Mott insulator
+physics, and an unusual optical absorption, due to the simultaneous presence of
+the spin-orbit coupling, strong correlation, multiple orbitals, Rashba spin
+splitting, and broken symmetry. For the half-filled 1D bands, we find, quite
+surprisingly, a broadening of the 1D bands due to correlation, as opposed to
+the expected band narrowing. This is interpreted to be due to multiple orbitals
+forming the single Hubbard band at different points of the Brillouin zone.
+Furthermore, due to the presence of an intrinsic electric field along the
+lateral direction, the 1D bands are Rashba spin-split and provide a new
+mechanism for tuning the valley dependent optical transitions.",2304.03620v1
+2012-11-29,Microscopic theory of magnetism in Sr3Ir2O7,"An intriguing idea of spin-orbit Mott insulator has been proposed to explain
+magnetic insulating behavior in various iridates. This scenario relies on the
+strength of the spin-orbit coupling being comparable to electronic
+correlations, and it is not a priori obvious whether this picture is valid for
+all iridates. In particular, Sr3Ir2O7 exhibits a small charge gap and magnetic
+moment compared to Sr2IrO4, questioning the validity of such hypothesis. To
+understand the microscopic mechanism for magnetism in Sr3Ir2O7, we construct a
+tight binding model taking into account the full t2g- orbitals, the staggered
+rotation of the local octahedra, and the bilayer structure. The bands near the
+Fermi level are mainly characterized by the total angular momentum Jeff = 1/2,
+except below the {\Gamma} point, supporting a reasonably strong spin-orbit
+coupling picture. A first order transition to a collinear antiferromagnet via
+multi-orbital Hubbard interactions is found within the mean field
+approximation. The magnetic moment jump at the transition is consistently
+smaller than Sr2IrO4, originated from the underlying band structure of a barely
+band insulator. Given the small charge gap and moment observed in Sr3Ir2O7, the
+system is close to a magnetic transition. A comparison to a spin-model is
+presented and connection to the Mott insulator is also discussed.",1211.7067v1
+2011-07-14,"Role of Degeneracy, Hybridization, and Nesting in the Properties of Multi-Orbital Systems","To understand the role that degeneracy, hybridization, and nesting play in
+the magnetic and pairing properties of multiorbital Hubbard models we here
+study numerically two types of two- orbital models, both with hole-like and
+electron-like Fermi surfaces (FS's) that are related by nesting vectors ({\pi},
+0) and (0, {\pi}). In one case the bands that determine the FS's arise from
+strongly hybridized degenerate dxz and dyz orbitals, while in the other the two
+bands are determined by non-degenerate and non-hybridized s-like orbitals.
+Using a variety of techniques, in the weak coupling regime it is shown that
+only the model with hybridized bands develops metallic magnetic order, while
+the other model exhibits an ordered excitonic orbital-transverse spin state
+that is insulating and does not have a local magnetization. However, both
+models display similar insulating magnetic stripe ordering in the strong
+coupling limit. These results indicate that nesting is a necessary but not
+sufficient condition for the development of ordered states with finite local
+magnetization in multiorbital Hubbard systems; the additional ingredient
+appears to be that the nested portions of the bands need to have the same
+orbital flavor. This condition can be achieved via strong hybridization of the
+orbitals in weak coupling or via the FS reconstruction induced by the Coulomb
+interactions in the strong coupling regime. This effect also impacts the
+pairing symmetry as demonstrated by the study of the dominant pairing channels
+for the two models.",1107.2962v1
+2021-09-01,Influence of Rashba spin-orbit and Rabi couplings on the miscibility and ground state phases of binary Bose-Einstein condensates,"We study the miscibility properties and ground state phases of two-component
+spin-orbit (SO) coupled Bose-Einstein condensates (BECs) in a harmonic trap
+with strong axial confinement. By numerically solving the coupled
+Gross-Pitaevskii equations in the two-dimensional setting, we analyze the
+SO-coupled BECs for two possible permutations of the intra- and interspecies
+interactions, namely (i) weak intra- and weak interspecies interactions (W-W)
+and (ii) weak intra- and strong interspecies interactions (W-S). Considering
+the density overlap integral as a miscibility order parameter, we investigate
+the miscible-immiscible transition by varying the coupling parameters. We
+obtain various ground state phases, including plane wave, half quantum vortex,
+elongated plane wave, and different stripe wave patterns for W-W interactions.
+For finite Rabi coupling, an increase in SO coupling strength leads to the
+transition from the fully miscible to the partially miscible state. We also
+characterize different ground states in the coupling parameter space using the
+root mean square sizes of the condensate. The spin density vector for the
+ground state phases exhibits density, quadrupole and dipole like spin
+polarizations. For the W-S interaction, in addition to that observed in the W-W
+case, we witness semi vortex, mixed mode, and shell-like immiscible phases. We
+notice a wide variety of spin polarizations, such as density, dipole,
+quadrupole, symbiotic, necklace, and stripe-like patterns for the W-S case. A
+detailed investigation in the coupling parameter space indicates immiscible to
+miscible state phase transition upon varying the Rabi coupling for a fixed
+Rashba SO coupling. The critical Rabi coupling for the immiscible-miscible
+phase transition decreases upon increasing the SO coupling strength.",2109.00491v1
+2022-09-15,Spin-orbital-angular-momentum-coupled quantum gases,"We briefly review the recent progress of theories and experiments on
+spin-orbital-angular-momentum (SOAM)-coupled quantum gases. The coupling
+between the intrinsic degree of freedom of particles and their external orbital
+motions widely exists in universe, and leads to a broad variety of fundamental
+phenomena both in the classical physics and quantum mechanics. Recent
+realization of synthetic SOAM coupling in cold atoms has attracted a great deal
+of attention, and stimulates a large amount of considerations on exotic quantum
+phases in both Bose and Fermi gases. In this review, we present a basic idea of
+engineering SOAM coupling in neutral atoms, starting from a semiclassical
+description of atom-light interaction. Unique features of the single-particle
+physics in the presence of SOAM coupling are discussed. The intriguing
+ground-state quantum phases of weakly interacting Bose gases are introduced,
+with emphasis on a so-called angular stripe phase, which has yet been observed
+at present. It is demonstrated how to generate a stable giant vortex in a
+SOAM-coupled Fermi superfluid. We also discuss topological characters of a
+Fermi superfluid in the presence of SOAM coupling. We then introduce the
+experimental achievement of SOAM coupling in $^{87}$Rb Bose gases and its first
+observation of phase transitions. The most recent development of SOAM-coupled
+Bose gases in experiments is also summarized. Regarding the controllability of
+ultracold quantum gases, it opens a new era, on the quantum simulation point of
+view, to study the fundamental physics resulted from SOAM coupling as well as
+newly emergent quantum phases.",2209.07051v2
+2016-10-20,All-Electrical Spin Field Effect Transistor in van der Waals Heterostructures at Room Temperature,"Spintronics aims to exploit the spin degree of freedom in solid state devices
+for data storage and information processing technologies. The fundamental
+spintronic device concepts such as creation, manipulation and detection of spin
+polarization has been demonstrated in semiconductors and spin transistor
+structures using both the electrical and optical methods. However, an unsolved
+challenge in the field is the realization of all electrical methods to control
+the spin polarization and spin transistor operation at ambient temperature. For
+this purpose, two-dimensional (2D) crystals offer a unique platform due to
+their remarkable and contrasting spintronic properties, such as weak spin-orbit
+coupling (SOC) in graphene and strong SOC in molybdenum disulfide (MoS$_2$).
+Here we combine graphene and MoS$_2$ in a van der Waals heterostructure to
+realize the electric control of the spin polarization and spin lifetime, and
+demonstrated a spin field-effect transistor (spin-FET) at room temperature in a
+non-local measurement geometry. We observe electrical gate control of the spin
+valve signal due to pure spin transport and Hanle spin precession signals in
+the graphene channel in proximity with MoS$_2$ at room temperature. We show
+that this unprecedented control over the spin polarization and lifetime stems
+from the gate-tuning of the Schottky barrier at the MoS$_2$/graphene interface
+and MoS$_2$ channel conductivity leading to spin interaction with high SOC
+material. The all-electrical creation, transport and control of the spin
+polarization in a spin-FET device at room temperature is a substantial step in
+the field of spintronics. It opens a new platform for the interplay of spin,
+charge and orbital degrees of freedom for testing a plethora of exotic physical
+phenomena, which can be key building blocks in future device architectures.",1610.06326v1
+2015-04-17,"Electrically Engineered Band Gap in Two-Dimensional Ge, Sn, and Pb: A First-Principles and Tight-Binding Approach","First-principles calculations were performed to investigate the electronic
+structure of two-dimensional (2-D) Ge, Sn, and Pb without and with the presence
+of an external electric field in combination with spin-orbit coupling.
+Tight-binding calculations based on four orbitals per atom and an effective
+single orbital are presented to match with the results obtained from
+first-principles calculations. In particular, the electronic band structure and
+the band splitting are investigated with both models. Moreover, the simple
+$k\cdot p$ model is also considered in order to understand the band splitting
+in the presence of an external electric field and spin-orbit coupling. A large
+splitting is obtained, which is expected to be useful for spintronic devices.
+The fair agreement between the first-principle, $k\cdot p$ model, and
+tight-binding approaches leads to a table of parameters for future
+tight-binding studies on hexagonal 2-D nanostructures. By using the tight
+binding parameters, the transport properties of typical 0-D triangular quantum
+dots between two semi-infinite electrodes in the presence of spin-orbit
+coupling are addressed.",1504.04601v1
+2021-06-18,Magnetic response of metallic nanoparticles: Geometric and weakly relativistic effects,"While the large paramagnetic response measured in certain ensembles of
+metallic nanoparticles has been assigned to orbital effects of conduction
+electrons, the spin-orbit coupling has been pointed out as a possible origin of
+the anomalously large diamagnetic response observed in other cases. Such a
+relativistic effect, arising from the inhomogeneous electrostatic potential
+seen by the conduction electrons, might originate from the host ionic lattice,
+impurities, or the self-consistent confining potential. Here we theoretically
+investigate the effect of the spin-orbit coupling arising from the confining
+potential, quantifying its contribution to the zero-field magnetic
+susceptibility and gauging it against the ones generated by other
+weakly-relativistic corrections. Two ideal geometries are considered in detail,
+the sphere and the half-sphere, focusing on the expected increased role of the
+spin-orbit coupling upon a symmetry reduction, and the application of these
+results to actual metallic nanoparticles is discussed. The matrix elements of
+the different weakly-relativistic corrections are obtained and incorporated in
+a perturbative treatment of the magnetic field, leading to tractable
+semi-analytical and semiclassical expressions for the case of the sphere, while
+a numerical treatment becomes necessary for the half-sphere. The correction to
+the zero-field susceptibility arising from the spin-orbit coupling in a single
+sphere is quite small, and it is dominated by the weakly-relativistic kinetic
+energy correction, which in turn remains considerably smaller than the typical
+values of the nonrelativistic zero-field susceptibility. Moreover, the
+spin-orbit contribution to the average response for ensembles of nanoparticles
+with a large size dispersion is shown to vanish. The symmetry reduction in
+going from the single sphere to the half-sphere does not translate into a
+significant (...)",2106.10113v3
+2023-12-07,Colossal orbital Zeeman effect driven by tunable spin-Berry curvature in a kagome metal,"Berry phase and the related concept of Berry curvature can give rise to many
+unconventional phenomena in solids. In this work, we discover colossal orbital
+Zeeman effect of topological origin in a newly synthesized bilayer kagome metal
+TbV6Sn6. We use spectroscopic-imaging scanning tunneling microscopy to study
+the magnetic field induced renormalization of the electronic band structure.
+The nonmagnetic vanadium d-orbitals form Dirac crossings at the K point with a
+small mass gap and strong Berry curvature induced by the spin-orbit coupling.
+We reveal that the magnetic field leads to the splitting of gapped Dirac
+dispersion into two branches with giant momentum-dependent g factors, resulting
+in the substantial renormalization of the Dirac band. These measurements
+provide a direct observation of the magnetic field controlled orbital Zeeman
+coupling to the enormous orbital magnetic moments of up to 200 Bohr magnetons
+near the gapped Dirac points. Interestingly, the effect is increasingly
+non-linear, and becomes gradually suppressed at higher magnetic fields.
+Theoretical modeling further confirms the existence of orbital magnetic moments
+in TbV6Sn6 produced by the non-trivial spin-Berry curvature of the Bloch wave
+functions. Our work provides the first direct insight into the
+momentum-dependent nature of topological orbital moments and their tunability
+by magnetic field concomitant with the evolution of the spin-Berry curvature.
+Significantly large orbital magnetic moments driven by the Berry curvature can
+also be generated by other quantum numbers beyond spin, such as the valley in
+certain graphene-based structures, which may be unveiled using the same tools
+highlighted in our work.",2312.04445v1
+2015-04-13,Transverse and longitudinal angular momenta of light,"We review basic physics and novel types of optical angular momentum. We start
+with a theoretical overview of momentum and angular momentum properties of
+generic optical fields, and discuss methods for their experimental
+measurements. In particular, we describe the well-known longitudinal (i.e.,
+aligned with the mean momentum) spin and orbital angular momenta in polarized
+vortex beams. Then, we focus on the transverse (i.e., orthogonal to the mean
+momentum) spin and orbital angular momenta, which were recently actively
+discussed in theory and observed in experiments. First, the recently-discovered
+transverse spin angular momenta appear in various structured fields: evanescent
+waves, interference fields, and focused beams. We show that there are several
+kinds of transverse spin angular momentum, which differ strongly in their
+origins and physical properties. We describe extraordinary features of the
+transverse optical spins and overview recent experiments. In particular, the
+helicity-independent transverse spin inherent in edge evanescent waves offers
+robust spin-direction coupling at optical interfaces (the quantum spin Hall
+effect of light). Second, we overview the transverse orbital angular momenta of
+light, which can be both extrinsic and intrinsic. These two types of the
+transverse orbital angular momentum are produced by spatial shifts of the
+optical beams (e.g., in the spin Hall effect of light) and their Lorentz
+boosts, respectively. Our review is underpinned by a unified theory of the
+angular momentum of light based on the canonical momentum and spin densities,
+which avoids complications associated with the separation of spin and orbital
+angular momenta in the Poynting picture. It allows us to construct
+comprehensive classification of all known optical angular momenta based on
+their key parameters and main physical properties.",1504.03113v2
+2022-09-16,"Interplay of Structural Chirality, Electron Spin and Topological Orbital in Chiral Molecular Spin Valves","Chirality has been a property of central importance in chemistry and biology
+for more than a century, and is now taking on increasing relevance in condensed
+matter physics. Recently, electrons were found to become spin polarized after
+transmitting through chiral molecules, crystals, and their hybrids. This
+phenomenon, called chirality-induced spin selectivity (CISS), presents broad
+application potentials and far-reaching fundamental implications involving
+intricate interplays among structural chirality, topological states, and
+electronic spin and orbitals. However, the microscopic picture of how chiral
+geometry influences electronic spin remains elusive. In this work, via a direct
+comparison of magnetoconductance (MC) measurements on magnetic
+semiconductor-based chiral molecular spin valves with normal metal electrodes
+of contrasting strengths of spin-orbit coupling (SOC), we unambiguously
+identified the origin of the SOC, a necessity for the CISS effect, given the
+negligible SOC in organic molecules. The experiments revealed that a
+heavy-metal electrode provides SOC to convert the orbital polarization induced
+by the chiral molecular structure to spin polarization. Our results evidence
+the essential role of SOC in the metal electrode for engendering the CISS spin
+valve effect. A tunneling model with a magnetochiral modulation of the
+potential barrier is shown to quantitatively account for the unusual transport
+behavior. This work hence produces critical new insights on the microscopic
+mechanism of CISS, and more broadly, reveals a fundamental relation between
+structure chirality, electron spin, and orbital.",2209.08117v1
+2017-07-06,The role of spin-orbit coupling in the electronic structure of IrO$_2$,"The delicate interplay of electronic charge, spin, and orbital degrees of
+freedom is in the heart of many novel phenomena across the transition metal
+oxide family. Here, by combining high- resolution angle resolved photoemission
+spectroscopy and first principles calculations (with and without spin-orbit
+coupling), the electronic structure of the rutile binary iridate, IrO$_2$ is
+investigated. The detailed study of electronic bands measured on a high-quality
+single crystalline sample, and use of a wide range of photon energy provide a
+huge improvement over the previous studies. The excellent agreement between
+theory and experimental results shows that the single-particle DFT description
+of IrO$_2$ band structure is adequate, without the need of invoking any
+treatment of correlation effects. Although many observed features point to a 3D
+nature of the electronic structure, clear surface effects are revealed. The
+discussion of the orbital character of the relevant bands crossing the Fermi
+level sheds light on spin orbit coupling-driven phenomena in this material,
+unveiling a spin-orbit induced avoided crossing, a property likely to play key
+role in its large spin Hall effect.",1707.01624v3
+2016-01-21,Detection of spin pumping from YIG by spin-charge conversion in a Au/Ni$_{80}$Fe$_{20}$ spin-valve structure,"Many experiments have shown the detection of spin-currents driven by
+radio-frequency spin pumping from yttrium iron garnet (YIG), by making use of
+the inverse spin-Hall effect, which is present in materials with strong
+spin-orbit coupling, such as Pt. Here we show that it is also possible to
+directly detect the resonance-driven spin-current using Au/permalloy (Py,
+Ni$_{80}$Fe$_{20}$) devices, where Py is used as a detector for the spins
+pumped across the YIG/Au interface. This detection mechanism is equivalent to
+the spin-current detection in metallic non-local spin-valve devices. By finite
+element modeling we compare the pumped spin-current from a reference Pt strip
+with the detected signals from the Au/Py devices. We find that for one series
+of Au/Py devices the calculated spin pumping signals mostly match the
+measurements, within 20%, whereas for a second series of devices additional
+signals are present which are up to a factor 10 higher than the calculated
+signals from spin pumping. We also identify contributions from thermoelectric
+effects caused by the resonant (spin-related) and non-resonant heating of the
+YIG. Thermocouples are used to investigate the presence of these thermal
+effects and to quantify the magnitude of the Spin-(dependent-)Seebeck effect.
+Several additional features are observed, which are also discussed.",1601.05605v1
+2016-05-23,Direct comparison of current-induced spin polarization in topological insulator Bi2Se3 and InAs Rashba states,"Three-dimensional topological insulators (TIs) exhibit time-reversal symmetry
+protected, linearly dispersing Dirac surface states. Band bending at the TI
+surface may also lead to coexisting trivial two-dimensional electron gas (2DEG)
+states with parabolic energy dispersion that exist as spin-split pairs due to
+Rashba spin-orbit coupling (SOC). A bias current is expected to generate spin
+polarization in both systems arising from their helical spin-momentum locking.
+However, their induced spin polarization is expected to be different in both
+magnitude and sign. Here, we compare spin potentiometric measurements of bias
+current-generated spin polarization in Bi2Se3(111) films where Dirac surface
+states coexist with trivial 2DEG states, with identical measurements on
+InAs(001) samples where only trivial 2DEG states are present. We observe spin
+polarization arising from spin-momentum locking in both cases, with opposite
+signs of the spin voltage. We present a model based on spin dependent
+electrochemical potentials to directly derive the signs expected for the TI
+surface states, and unambiguously show that the dominant contribution to the
+current-generated spin polarization measured in the TI is from the Dirac
+surface states. This direct electrical access of the helical spin texture of
+Dirac and Rashba 2DEG states is an enabling step towards the electrical
+manipulation of spins in next generation TI and SOC based quantum devices.",1605.07155v1
+2017-12-30,Spin-Hall effect and emergent antiferromagnetic phase transition in n-Si,"Spin current experiences minimal dephasing and scattering in Si due to small
+spin-orbit coupling and spin-lattice interactions is the primary source of spin
+relaxation. We hypothesize that if the specimen dimension is of the same order
+as the spin diffusion length then spin polarization will lead to
+non-equilibrium spin accumulation and emergent phase transition. In n-Si, spin
+diffusion length has been reported up to 6 {\mu}m. The spin accumulation in Si
+will modify the thermal transport behavior of Si, which can be detected with
+thermal characterization. In this study, we report observation of spin-Hall
+effect and emergent antiferromagnetic phase transition behavior using
+magneto-electro-thermal transport characterization. The freestanding Pd (1 nm)/
+Ni80Fe20 (75 nm)/ MgO (1 nm)/ n-Si (2 micron) thin film specimen exhibits a
+magnetic field dependent thermal transport and spin-Hall magnetoresistance
+behavior attributed to Rashba effect. An emergent phase transition is
+discovered using self-heating 3omega method, which shows a diverging behavior
+at 270 K as a function of temperature similar to a second order phase
+transition. We propose that spin-Hall effect leads to the spin accumulation and
+resulting emergent antiferromagnetic phase transition. We propose that the
+length scale for Rashba effect can be equal to the spin diffusion length and
+two-dimensional electron gas is not essential for it. The emergent
+antiferromagnetic phase transition is attributed to the site inversion
+asymmetry in diamond cubic Si lattice.",1801.00073v1
+2019-10-10,Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe$_2$ at room temperature,"Efficient and versatile spin-to-charge current conversion is crucial for the
+development of spintronic applications, which strongly rely on the ability to
+electrically generate and detect spin currents. In this context, the spin Hall
+effect has been widely studied in heavy metals with strong spin-orbit coupling.
+While the high crystal symmetry in these materials limits the conversion to the
+orthogonal configuration, unusual configurations are expected in low symmetry
+transition metal dichalcogenide semimetals, which could add flexibility to the
+electrical injection and detection of pure spin currents. Here, we report the
+observation of spin-to-charge conversion in MoTe$_2$ flakes, which are stacked
+in graphene lateral spin valves. We detect two distinct contributions arising
+from the conversion of two different spin orientations. In addition to the
+conventional conversion where the spin polarization is orthogonal to the charge
+current, we also detect a conversion where the spin polarization and the charge
+current are parallel. Both contributions, which could arise either from bulk
+spin Hall effect or surface Edelstein effect, show large efficiencies
+comparable to the best spin Hall metals and topological insulators. Our finding
+enables the simultaneous conversion of spin currents with any in-plane spin
+polarization in one single experimental configuration.",1910.04642v1
+2019-04-02,Spin pumping and spin torque in interfacial tailored Co2FeAl/\b{eta}-Ta layers,"The Heusler ferromagnetic (FM) compound Co2FeAl interfaced with a high-spin
+orbit coupling non-magnetic (NM) layer is a promising candidate for energy
+efficient spin logic circuits. The circuit potential depends on the strength of
+angular momentum transfer across the FM/NM interface; hence, requiring low spin
+memory loss and high spin-mixing conductance. To highlight this issue, spin
+pumping and spin-transfer torque ferromagnetic resonance measurements have been
+performed on Co_2FeAl/\beta-Ta heterostructures tailored with Cu interfacial
+layers. The interface tailored structure yields an enhancement of the effective
+spin-mixing conductance. The interface transparency and spin memory loss
+corrected values of the spin-mixing conductance, spin Hall angle and spin
+diffusion length are found to be 3.40 \pm 0.01 \times 10^{19} m^{-2}, 0.029 \pm
+0.003, and 2.3 \pm 0.5 nm, respectively. Furthermore, a high current modulation
+of the effective damping of around 2.1 % has been achieved at an applied
+current density of 1 \times 10^9 A/m^2 , which clearly indicates the potential
+of using this heterostructure for energy efficient control in spin devices",1904.01506v3
+2022-03-11,Full-plane persistent spin textures with cubic order intrinsic and anisotropic band splitting in bulk Lead-free materials,"Spin-orbit coupling (SOC) effects occurring in noncentrosymmetric materials
+are known to be responsible for nontrivial spin configurations and a number of
+emergent physical phenomena such as electrical control of spin degrees of
+freedom and spin-to-charge conversion. The materials preserving a uniform spin
+configuration in the momentum-space, known as persistent spin texture (PST),
+provide long carrier spin lifetimes through persistent spin helix (PSH)
+mechanism. However, most of the PST studied till now are attributed to the
+linear in \textbf{\textit{k}} splitting and cease to exist locally around
+certain high-symmetry-point of first Brillouin Zone (FBZ). The persistent spin
+textures with purely cubic spin splittings have drawn attention owing to unique
+benefits in spin transport. Here, by using the relativistic first-principles
+calculations supplemented with \textbf{\textit{k.p}} analysis, we report the
+emergence of purely cubic splitting (PCS) belonging to $D_{3h}$ point group,
+which is enforced by in-plane mirror and three-fold rotation operations. In
+addition, the in-plane mirror symmetry operation sustains the PST in larger
+region (i.e. full planes) of FBZ alongside giant spin splitting. Our results
+also demonstrate how application of uniaxial strain could be envisaged to tune
+the magnitude of the PCS, preserving the PST. The observed PSTs provide a route
+to non-dephasing spin transport with larger spin-Hall conductivity, thus
+offering a promising platform for future spintronics devices.",2203.05978v1
+1997-06-10,A timing formula for main-sequence star binary pulsars,"In binary radio pulsars with a main-sequence star companion, the spin-induced
+quadrupole moment of the companion gives rise to a precession of the binary
+orbit. As a first approximation one can model the secular evolution caused by
+this classical spin-orbit coupling by linear-in-time changes of the longitude
+of periastron and the projected semi-major axis of the pulsar orbit. This
+simple representation of the precession of the orbit neglects two important
+aspects of the orbital dynamics of a binary pulsar with an oblate companion.
+First, the quasiperiodic effects along the orbit, due to the anisotropic
+$1/r^3$ nature of the quadrupole potential. Secondly, the long-term secular
+evolution of the binary orbit which leads to an evolution of the longitude of
+periastron and the projected semi-major axis which is non-linear in time.
+  In this paper a simple timing formula for binary radio pulsars with a
+main-sequence star companion is presented which models the short-term secular
+and most of the short-term periodic effects caused by the classical spin-orbit
+coupling. I also give extensions of the timing formula which account for
+long-term secular changes in the binary pulsar motion. It is shown that the
+short-term periodic effects are important for the timing observations of the
+binary pulsar PSR B1259--63. The long-term secular effects are likely to become
+important in the next few years of timing observations of the binary pulsar PSR
+J0045--7319. They could help to restrict or even determine the moments of
+inertia of the companion star and thus probe its internal structure.
+  Finally, I reinvestigate the spin-orbit precession of the binary pulsar PSR
+J0045--7319 since the analysis given in the literature is based on an incorrect
+expression for the precession of the longitude of periastron.",9706086v2
+2014-02-05,Spin-orbit coupling as a source of long-range triplet proximity effect in superconductor-ferromagnet hybrid structures,"We investigate the proximity effect in diffusive superconducting hybrid
+structures with a spin-orbit (SO) coupling. Our study is focused on the
+singlet-triplet conversion and the generation of long-range superconducting
+correlations in ferromagnetic elements. We derive the quasiclassical equations
+for the Green's functions including the SO coupling terms in form of a
+background SU(2) field. With the help of these equations, we first present a
+complete analogy between the spin diffusion process in normal metals and the
+generation of the triplet components of the condensate in a diffusive
+superconducting structure in the presence of SO coupling. From this analogy it
+turns out naturally that the SO coupling is an additional source of the
+long-range triplet component (LRTC) besides the magnetic inhomogeneities
+studied in the past. We demonstrate an explicit connection between an
+inhomogeneous exchange field and SO coupling mechanisms for the generation of
+the LRTC and establish the conditions for the appearance of the LRTC in
+different geometries. We also consider a S/F bilayer in contact with normal
+metal with SO coupling and show that the latter can be used as a source for the
+LRTC. Our work gives a global description of the singlet-triplet conversion in
+hybrids structures in terms of generic spin-fields and our results are
+particularly important for the understanding of the physics underlying
+spintronics devices with superconductor elements.",1402.1025v3
+2023-11-10,Strong-coupling superconductivity of the Heusler-type compound ScAu2Al: Ab-initio studies,"The ScAu$_2$Al superconducting Heusler-type compound was recently
+characterized to have the highest critical temperature of $T_c = 5.12$ K and
+the strongest electron-phonon coupling among the Heusler family. In this work,
+the electronic structure, phonons, electron-phonon coupling, and
+superconductivity of ScAu$_2$Al are studied using \textit{ab initio}
+calculations. The spin-orbit coupling significantly changes the electronic
+structure removing the van Hove singularity from the vicinity of the Fermi
+level. In the phonon spectrum, low frequency acoustic modes, additionally
+softened by the spin-orbit interaction, strongly couple with electrons, leading
+to the electron-phonon coupling constant $\lambda=1.25$, a record high among
+Heuslers. The density functional theory for superconductors is then used to
+analyze superconducting {state in this two-band superconductor}. The effect of
+spin fluctuations (SF) on superconductivity is also analyzed. The calculated
+critical temperatures of $T_c = 5.16$ K (4.79 K with SF) agree very well with
+the experiment, confirming the electron-phonon mechanism of superconductivity
+and showing a weak spin-fluctuations effect. The superconducting gaps formed on
+two Fermi surface sheets exhibit moderate anisotropy. Their magnitudes confirm
+the strong coupling regime, as the reduced average values are $2\Delta_1/k_BT_c
+\simeq 4.1$ and $2\Delta_2/k_BT_c \simeq 4.3$. Anisotropy of the gaps and large
+spread in their values significantly affect the calculated quasiparticle
+density of states.",2311.06075v3
+2006-10-24,Scattering on the lateral one-dimensional superlattice with spin-orbit coupling,"The problem of scattering of the two-dimensional electron gas on the lateral
+one-dimensional superlattice both having different strengths of Rashba
+spin-orbit coupling is investigated. The scattering is considered for all the
+electron states on a given Fermi level. The distribution of spin density
+components along the superlattice is studied for the transmitted states where
+the formation of standing waves is observed. It is found that the shape of spin
+density distribution is robust against the variations of the Rashba coupling
+constants, the superlattice potential strength, and the Fermi level in the
+electron gas.",0610657v3
+2007-10-02,Microscopic mechanisms of spin-dependent electric polarization in 3d oxides,"We address a systematic microscopic theory of spin-dependent electric
+polarization in 3d oxides starting with a generic three-site two-hole cluster.
+A perturbation scheme realistic for 3d oxides is applied which implies the
+quenching of orbital moments by low-symmetry crystal field, strong intra-atomic
+correlations, the dp-transfer effects, and rather small spin-orbital coupling.
+An effective spin operator of the electric dipole moment is deduced
+incorporating both nonrelativistic and relativistic terms. The nonrelativistic
+electronic polarization mechanism related with the effects of the
+redistribution of the local on-site charge density due to $pd$ covalency and
+exchange coupling is believed to govern the multiferroic behaviour in 3d
+oxides. The relativistic exchange-dipole moment is mainly stems from the
+nonrelativistic one due to the perturbation effect of Dzyaloshinsky-Moriya
+coupling and is estimated to be a weak contributor to the electric polarization
+observed in the most of 3d multiferroics.",0710.0496v1
+2009-04-13,Metal-insulator transition in a quantum wire driven by a modulated Rashba spin-orbit coupling,"We study the ground-state properties of electrons confined to a quantum wire
+and subject to a smoothly modulated Rashba spin-orbit coupling. When the period
+of the modulation becomes commensurate with the band filling, the Rashba
+coupling drives a quantum phase transition to a nonmagnetic insulating state.
+Using bosonization and a perturbative renormalization group approach, we find
+that this state is robust against electron-electron interactions. The gaps to
+charge- and spin excitations scale with the amplitude of the Rashba modulation
+with a common interaction-dependent exponent. An estimate of the expected size
+of the charge gap, using data for a gated InAs heterostructure, suggests that
+the effect can be put to practical use in a future spin transistor design.",0904.1846v2
+2014-01-01,Analytic theory of Hund's metals: a renormalization group perspective,"We study the emergence of quasiparticles in Hund's metals with an
+SU($M$)$\times$SU($N$)-symmetric Kondo impurity model carrying both spin and
+orbital degrees of freedom. We show that the coupling of the impurity spin to
+the conduction electrons can be \emph{ferromagnetic}, notably for hole-doped
+iron pnictides. We derive the weak-coupling renormalization group (RG)
+equations for arbitrary representations of SU($M$)$\times$SU($N$). A
+ferromagnetic spin coupling results in a protracted RG flow, accounting for the
+surprising particle-hole asymmetry that is observed in the iron-pnictide
+systems. We establish the low coherence scale $T_{\rm K}$ which depends on the
+filling through the impurity representation. We also discuss the temperature
+dependence of the spin and orbital susceptibilities. Finally, we argue that
+this mechanism explains the strong valence dependence of the coherence scale
+observed in dilute transition-metal magnetic alloys.",1401.0331v3
+2015-05-07,Currents induced by magnetic impurities in superconductors with spin-orbit coupling,"We show that superconducting currents are generated around magnetic
+impurities and ferromagnetic islands proximity-coupled to superconductors with
+finite spin-orbit coupling. Using the Ginzburg-Landau theory, T-matrix
+calculation, as well as self-consistent numerical simulation on a lattice, we
+find a strong dependence of the current on the direction and magnitude of the
+magnetic moment. We establish that in the case of point magnetic impurities,
+the current is carried by the induced Yu-Shiba-Rusinov (YSR) subgap states. In
+the vicinity of the phase transition, where the YSR states cross at zero
+energy, the current increases dramatically. Furthermore, we show that the
+currents are orthogonal to the local spin polarization and, thus, can be probed
+by measuring the spin-polarized local density of states.",1505.01672v2
+2015-05-08,Visibility and stability of superstripes in a spin-orbit-coupled Bose-Einstein condensate,"We consider a spin-$1/2$ Bose-Einstein condensate with equal Rashba and
+Dresselhaus spin-orbit coupling. After reviewing some relevant features of the
+quantum phases of the system, we present a short study on how their properties
+are changed by the presence of non-zero magnetic detunings and spin-asymmetric
+interactions. At small values of the Raman coupling and of the magnetic field
+the so-called stripe phase occurs, which displays both superfluidity and
+periodic density modulations, in analogy with supersolids. We finally review a
+recent proposal (Phys. Rev. A 90, 041604) to improve the visibility of the
+fringes, based on the space separation of the two spin components into a 2D
+bi-layer configuration and on the application of a $\pi/2$ Bragg pulse, and we
+show that this new configuration also yields a sizable increase of the
+stability of the stripe phase against magnetic fluctuations.",1505.02088v2
+2015-11-04,S=1/2 quantum critical spin ladders produced by orbital ordering in Ba2CuTeO6,"The ordered hexagonal perovskite Ba2CuTeO6 hosts weakly coupled S=1/2 spin
+ladders produced by an orbital ordering of Cu2+. The magnetic susceptibility
+chi(T) of Ba2CuTeO6 is well described by that expected for isolated spin
+ladders with exchange coupling of J~86 K but shows a deviation from the
+expected thermally activated behavior at low temperatures below T*~25 K. An
+anomaly in chi(T), indicative of magnetic ordering, is observed at T_mag=16 K.
+No clear signature of long-range ordering, however, is captured in NMR,
+specific heat or neutron diffraction measurements at and below T_mag. The
+marginal magnetic transition, indicative of strong quantum fluctuations, is
+evidence that Ba2CuTeO6 is in very close proximity to a quantum critical point
+between a magnetically ordered phase and a gapped spin liquid controlled by
+inter-ladder couplings.",1511.01477v1
+2017-03-22,Spin-orbit coupling induced two-electron relaxation in silicon donor pairs,"We unravel theoretically a key intrinsic relaxation mechanism among the
+low-lying singlet and triplet donor-pair states in silicon, an important
+element in the fast-developing field of spintronics and quantum computation.
+Despite the perceived weak spin-orbit coupling (SOC) in Si, we find that our
+discovered relaxation mechanism, combined with the electron-phonon and
+inter-donor interactions, dominantly drives the transitions in the two-electron
+states over a large range of donor coupling regime. The scaling of the
+relaxation rate with inter-donor exchange interaction $J$ goes from $J^5$ to
+$J^4$ at the low to high temperature limits. Our analytical study draws on the
+symmetry analysis over combined band, donor envelope and valley configurations.
+It uncovers naturally the dependence on the donor-alignment direction and
+triplet spin orientation, and especially on the dominant SOC source from donor
+impurities. While a magnetic field is not necessary for this relaxation, unlike
+in the single-donor spin relaxation, we discuss the crossover behavior with
+increasing Zeeman energy in order to facilitate comparison with experiments.",1703.07788v2
+2017-04-05,Collective excitation of a trapped Bose-Einstein condensate with spin-orbit coupling,"We investigate the collective excitations of a Raman-induced spin-orbit
+coupled Bose-Einstein condensate confined in a quasi one-dimension harmonic
+trap using the Bogoliubov method. By tuning the Raman coupling strength, three
+phases of the system can be identified. By calculating the transition strength,
+we are able to classify various excitation modes that are experimentally
+relevant. We show that the three quantum phases possess distinct features in
+their collective excitation properties. In particular, the spin dipole and the
+spin breathing modes can be used to clearly map out the phase boundaries. We
+confirm these predictions by direct numerical simulations of the quench
+dynamics that excites the relevant collective modes.",1704.01242v1
+2017-10-19,Moiré excitons: from programmable quantum emitter arrays to spin-orbit coupled artificial lattices,"Highly uniform and ordered nanodot arrays are crucial for high performance
+quantum optoelectronics including new semiconductor lasers and single photon
+emitters, and for synthesizing artificial lattices of interacting
+quasiparticles towards quantum information processing and simulation of
+many-body physics. Van der Waals heterostructures of 2D semiconductors are
+naturally endowed with an ordered nanoscale landscape, i.e. the moir\'e pattern
+that laterally modulates electronic and topographic structures. Here we find
+these moir\'e effects realize superstructures of nanodot confinements for
+long-lived interlayer excitons, which can be either electrically or strain
+tuned from perfect arrays of quantum emitters to excitonic superlattices with
+giant spin-orbit coupling (SOC). Besides the wide range tuning of emission
+wavelength, the electric field can also invert the spin optical selection rule
+of the emitter arrays. This unprecedented control arises from the gauge
+structure imprinted on exciton wavefunctions by the moir\'e, which underlies
+the SOC when hopping couples nanodots into superlattices. We show that the
+moir\'e hosts complex-hopping honeycomb superlattices, where exciton bands
+feature a Dirac node and two Weyl nodes, connected by spin-momentum locked
+topological edge modes.",1710.07015v1
+2018-05-16,Extended Creutz ladder with spin-orbit coupling: a one-dimensional analog of the Kane-Mele model,"We construct a topological ladder model, one-dimensional, following the steps
+which lead to the Kane-Mele model in two dimensions. Starting with a Creutz
+ladder we modify it so that the gap closure points can occur at either $k = \pi
+/ 2$ or $-\pi/2$. We then couple two such models, one for each spin channel, in
+such a way that time-reversal invariance is restored. We also add a Rashba
+spin-orbit coupling term. The model falls in the CII symmetry class. We derive
+the relevant $2\mathbb{Z}$ topological index, calculate the phase diagram and
+demonstrate the existence of edge states. We also give the thermodynamic
+derivation of the quantum spin Hall conductance (St\v{r}eda-Widom). Approximate
+implementation of this result indicates that this quantity is sensitive to the
+topological behavior of the model.",1806.01111v1
+2020-05-09,Chaotic cyclotron and Hall trajectories due to spin-orbit coupling,"We demonstrate that the synergistic effect of a gauge field, Rashba
+spin-orbit coupling (SOC), and Zeeman splitting can generate chaotic cyclotron
+and Hall trajectories of particles. The physical origin of the chaotic behavior
+is that the SOC produces a spin-dependent (so-called anomalous) contribution to
+the particle velocity and the presence of Zeeman field reduces the number of
+integrals of motion. By using analytical and numerical arguments, we study the
+conditions of chaos emergence and report the dynamics both in the regular and
+chaotic regimes. {We observe the critical dependence of the dynamic patterns
+(such as the chaotic regime onset) on small variations in the initial
+conditions and problem parameters, that is the SOC and/or Zeeman constants. The
+transition to chaotic regime is further verified by the analysis of phase
+portraits as well as Lyapunov exponents spectrum.} The considered chaotic
+behavior can occur in solid state systems, weakly-relativistic plasmas, and
+cold atomic gases with synthetic gauge fields and spin-related couplings.",2005.04468v1
+2020-09-09,Magnetic Anisotropy in Spin-3/2 with Heavy Ligand in Honeycomb Mott Insulators: Application to CrI$_3$,"Ferromagnetism in the two-dimensional CrI$_3$ has generated a lot of
+excitement, and it was recently proposed that the spin-orbit coupling (SOC) in
+Iodine may generate bond-dependent spin interactions leading to magnetic
+anisotropy. Here we derive a microscopic spin model of S=3/2 on transition
+metals surrounded by heavy ligands in honeycomb Mott insulators using a
+strong-coupling perturbation theory. For ideal octahedra we find Heisenberg and
+Kitaev interactions, which favor the magnetic moment along the cubic axis via
+quantum fluctuations. When a slight trigonal distortion of the octahedra is
+present together with the SOC, three additional interactions arise, comprised
+of the off-diagonal symmetric $\Gamma$ and $\Gamma^\prime$, and single-ion
+anisotropy. The resulting magnetic anisotropy pins the moment perpendicular to
+the honeycomb plane as observed in a single-layer of CrI$_3$, suggesting the
+significance of SOC and trigonal distortion in understanding magnetism of two
+dimensional Mott insulators. Comparison to the spin-orbit coupled $J_{\rm
+eff}$= 1/2 and S=1 models is also presented.",2009.04475v2
+2020-09-28,Spin-orbit coupling and linear crossings of dipolar magnons in van der Waals antiferromagnets,"A magnon spin-orbit coupling, induced by the dipole-dipole interaction, is
+derived in monoclinic-stacked bilayer honeycomb spin lattice with perpendicular
+magnetic anisotropy and antiferromagnetic interlayer coupling. Linear crossings
+are predicted in the magnon spectrum around the band minimum in G valley, as
+well as in the high frequency range around the zone boundary. The linear
+crossings in K and K' valleys, which connect the acoustic and optical bands,
+can be gapped when the intralayer dipole-dipole or Kitaev interactions exceed
+the interlayer dipole-dipole interaction, resulting in a phase transition from
+semimetal to insulator. Our results are useful for analyzing the magnon spin
+dynamics and transport properties in van der Waals antiferromagnet.",2009.13660v1
+2021-01-19,Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces,"The complex oxide heterostructures such as LaAlO3/SrTiO3 (LAO/STO) interface
+are paradigmatic platforms to explore emerging multi-degrees of freedom
+coupling and the associated exotic phenomena. In this study, we reveal the
+effects of multiorbital and magnetic ordering on Rashba spin-orbit coupling
+(SOC) at the LAO/STO (001) interface. Based on first-principles calculations,
+we show that the Rashba spin splitting near the conduction band edge can be
+tuned substantially by the interfacial insulator-metal transition due to the
+multiorbital effect of the lowest t_2g bands. We further unravel a competition
+between Rashba SOC and intrinsic magnetism, in which the Rashba SOC induced
+spin polarization is suppressed by the interfacial magnetic ordering. These
+results deepen our understanding of intricate electronic and magnetic
+reconstruction at the perovskite oxide interfaces and shed light on the
+engineering of oxide heterostructures for all-oxides-based spintronic devices.",2101.07586v1
+2021-02-03,Exciting the Goldstone Modes of a Supersolid Spin-Orbit-Coupled Bose Gas,"Supersolidity is deeply connected with the emergence of Goldstone modes,
+reflecting the spontaneous breaking of both phase and translational symmetry.
+Here, we propose accessible signatures of these modes in harmonically trapped
+spin-orbit-coupled Bose-Einstein condensates, where supersolidity appears in
+the form of stripes. By suddenly changing the trapping frequency, an axial
+breathing oscillation is generated, whose behavior changes drastically at the
+critical Raman coupling. Above the transition, a single mode of hybridized
+density and spin nature is excited, while below it, we predict a beating effect
+signaling the excitation of a Goldstone spin-dipole mode. We further provide
+evidence for the Goldstone mode associated with the translational motion of
+stripes. Our results open up new perspectives for probing supersolid properties
+in experimentally relevant configurations with both symmetric as well as highly
+asymmetric intraspecies interactions.",2102.02221v2
+2022-02-15,Electron Transfer and Spin-Orbit Coupling: How Strong are Berry Force Effects In and Out of Equilibrium in the Presence of Nuclear Friction?,"We investigate a spin-boson inspired model of electron transfer, where the
+diabatic coupling is given by a position-dependent phase, exp(iWx). We consider
+both equilibrium and nonequilibrium initial conditions. We show that, for this
+model, all equilibrium results are completely invariant to the sign of W(to
+infinite order). However, the nonequilibrium results do depend on the sign of
+W, suggesting that photo-induced electron transfer dynamics are meaningfully
+affected by Berry forces even in the presence of nuclear friction; furthermore,
+whenever there is spin-orbit coupling, electronic spin polarization can emerge
+(at least for some time).",2202.07204v1
+2022-02-27,"Layered Opposite Rashba Spin-Orbit Coupling in Bilayer Graphene: Loss of Spin Chirality, Symmetry Breaking and Topological Transition","Inversion symmetry in bilayer graphene allows for layered opposite Rashba
+spin-orbit coupling (LO-RSOC) -- the situation when the RSOC has the same
+magnitude but the opposite sign in two coupled spatially separated layers. We
+show that the LO-RSOC results in the loss of spin chirality in the momentum
+space, in contrast to the common uniform RSOC. This chirality loss makes it
+difficult to experimentally establish whether the LO-RSOC (on the scale of 10
+meV) exists, because the band structure is insensitive to it. To solve this
+problem, we propose to identify the LO-RSOC either by gating to break the
+inversion symmetry or by magnetic field to break the time-reversal symmetry.
+Remarkably, we observe the transition between trivial and non-trivial band
+topology as the system deviates from the LO Rashba state. Ab inito calculations
+suggest that bilayer graphene encapsulated by two monolayers of Au is a
+candidate to be a LO Rashba system.",2202.13267v2
+2023-07-10,Weyl Semimetallic State in the Rashba-Hubbard Model,"We investigate the Hubbard model with the Rashba spin-orbit coupling on a
+square lattice. The Rashba spin-orbit coupling generates two-dimensional Weyl
+points in the band dispersion. In a system with edges along [11] direction,
+zero-energy edge states appear, while no edge state exists for a system with
+edges along an axis direction. The zero-energy edge states with a certain
+momentum along the edges are predominantly in the up-spin state on the right
+edge, while they are predominantly in the down-spin state on the left edge.
+Thus, the zero-energy edge states are helical. By using a variational Monte
+Carlo method for finite Coulomb interaction cases, we find that the Weyl points
+can move toward the Fermi level by the correlation effects. We also investigate
+the magnetism of the model by the Hartree-Fock approximation and discuss weak
+magnetic order in the weak-coupling region.",2307.04307v2
+2011-03-10,Engineering a p+ip Superconductor: Comparison of Topological Insulator and Rashba Spin-Orbit Coupled Materials,"We compare topological insulator materials and Rashba coupled surfaces as
+candidates for engineering p+ip superconductivity. Specifically, in each type
+of material we examine 1) the limitations to inducing superconductivity by
+proximity to an ordinary s-wave superconductor, and 2) the robustness of the
+resulting superconductivity against disorder. We find that topological
+insulators have strong advantages in both regards: there are no fundamental
+barriers to inducing superconductivity, and the induced superconductivity is
+immune to disorder. In contrast, for Rashba coupled quantum wires or surface
+states, the the achievable gap from induced superconductivity is limited unless
+the Rashba coupling is large. Furthermore, for small Rashba coupling the
+induced superconductivity is strongly susceptible to disorder. These features
+pose serious difficulties for realizing p+ip superconductors in semiconductor
+materials due to their weak spin-orbit coupling, and suggest the need to seek
+alternatives. Some candidate materials are discussed.",1103.2129v2
+2011-12-05,Mixed partial-wave scattering with spin-orbit coupling and validity of pseudo-potentials,"We present exact solutions of two-body problem for spin-1/2 fermions with
+isotropic spin-orbit(SO) coupling and interacting with an arbitrary short-range
+potential. We find that in each partial-wave scattering channel, the
+parametrization of two-body wavefunction at short inter-particle distance
+depends on the scattering amplitudes of all channels. This reveals the mixed
+partial-wave scattering induced by SO couplings. By comparing with results from
+a square-well potential, we investigate the validity of original
+pseudo-potential models in the presence of SO coupling. We find the s-wave
+pseudo-potential provides a good approximation for low-energy solutions near
+s-wave resonances, given the length scale of SO coupling much longer than the
+potential range. However, near p-wave resonance the p-wave pseudo-potential
+gives low-energy solutions that are qualitatively different from exact ones,
+based on which we conclude that the p-wave model can not be applied to the
+fermion system if the SO coupling strength is larger or comparable to the Fermi
+momentum.",1112.1122v2
+2012-03-12,Bose-Einstein Condensates in Spin-Orbit Coupled Optical Lattices: Flat Bands and Superfluidity,"Recently spin-orbit (SO) coupled superfluids in free space or harmonic traps
+have been extensively studied, motivated by the recent experimental realization
+of SO coupling for Bose-Einstein condensates (BEC). However, the rich physics
+of SO coupled BEC in optical lattices has been largely unexplored. In this
+paper, we show that in suitable parameter region the lowest Bloch state forms
+an isolated flat band in a one dimensional (1D) SO coupled optical lattice,
+which thus provides an experimentally feasible platform for exploring the
+recently celebrated topological flat band physics in lattice systems. We show
+that the flat band is preserved even with the mean field interaction in BEC. We
+investigate the superfluidity of the BEC in SO coupled lattices through
+dynamical and Landau stability analysis, and show that the BEC is stable on the
+whole flat band.",1203.2389v2
+2015-04-08,Dissociation of Feshbach molecules via spin-orbit coupling in ultracold Fermi gases,"We study the dissociation of Feshbach molecules in ultracold Fermi gases with
+spin-orbit (SO) coupling. Since SO coupling can induce quantum transition
+between the Feshbach molecules and the fully polarized Fermi gas, the Feshbach
+molecules can be dissociated by the SO coupling. We experimentally realized
+this new type of dissociation in ultracold gases of 40K atoms with SO coupling
+created by Raman beams, and observed that the dissociation rate is highly
+non-monotonic on both the positive and negative Raman-detuning sides. Our
+results show that the dissociation of Feshbach molecules can be controlled by
+new degrees of freedoms, i.e., the SO-coupling intensity or the momenta of the
+Raman beams, as well as the detuning of the Raman beams.",1504.02021v1
+2017-03-27,Bright soliton dynamics in Spin Orbit-Rabi coupled Bose-Einstein condensates,"We investigate the dynamics of a spin-orbit (SO) coupled BECs in a time
+dependent harmonic trap and show the dynamical system to be completely
+integrable by constructing the Lax pair. We then employ gauge transformation
+approach to witness the rapid oscillations of the condensates for a relatively
+smaller value of SO coupling in a time independent harmonic trap compared to
+their counterparts in a transient trap. Keeping track of the evolution of the
+condensates in a transient trap during its transition from confining to
+expulsive trap, we notice that they collapse in the expulsive trap. We further
+show that one can manipulate the scattering length through Feshbach resonance
+to stretch the lifetime of the confining trap and revive the condensate.
+Considering a SO coupled state as the initial state, the numerical simulation
+indicates that the reinforcement of Rabi coupling on SO coupled BECs generates
+the striped phase of the bright solitons and does not impact the stability of
+the condensates despite destroying the integrability of the dynamical system.",1703.09119v1
+2013-09-08,Universal Trimers induced by Spin-Orbit Coupling in Ultracold Fermi Gases,"In this letter we address the issue how synthetic spin-orbit (SO) coupling
+can strongly affect three-body physics in ultracold atomic gases. We consider a
+system which consists of three fermionic atoms, including two spinless heavy
+atoms and one spin-1/2 light atom subjected to an isotropic SO coupling. We
+find that SO coupling can induce universal three-body bound states with
+negative s-wave scattering length at a smaller mass ratio, where no trimer
+bound state can exist if in the absence of SO coupling. The energies of these
+trimers are independent of high-energy cutoff, and therefore they are universal
+ones. Moreover, the resulting atom-dimer resonance can be effectively
+controlled by SO coupling strength. Our results can be applied to systems like
+${}^6$Li and ${}^{40}$K mixture.",1309.1925v1
+2022-01-19,Supersolid-like solitons in spin-orbit coupled spin-2 condensate,"We study supersolid-like crystalline structures emerging in the stationary
+states of a quasi-two-dimensional spin-orbit (SO)-coupled spin-2 condensate in
+the ferromagnetic, cyclic, and antiferro-magnetic phases by solving a
+mean-field model.Interplay of different strengths of SO coupling and
+interatomic interactions gives rise to a variety of non-trivial density
+patterns in the emergent solutions. For small SO-coupling strengths $\gamma$
+($\gamma \approx 0.5$), the ground state is an axisymmetric multi-ring soliton
+for polar, cyclic and weakly-ferromagnetic interactions, whereas for
+stronger-ferromagnetic interactions a circularly-asymmetric soliton emerges as
+the ground state.Depending on the values of interaction parameters, with an
+increase in SO-coupling strength, a stripe phase may also emerge as the ground
+state for polar and cyclic interactions. For intermediate values of SO-coupling
+strength ($\gamma \approx 1$), in addition to these solitons, one could have a
+quasi-degenerate triangular-lattice soliton in all magnetic phases. On further
+increasing the SO-coupling strength ($\gamma \gtrapprox 4$), a square-lattice
+and a superstripe soliton emerge as quasi-degenerate states. The emergence of
+all these solitons can be inferred from a study of solutions of the
+single-particle Hamiltonian.",2201.07500v1
+2023-11-17,Electron-phonon interaction and electronic correlations in transport through electrostatically and tunnel coupled quantum dots,"We investigate two equivalent capacitively and tunnel coupled quantum dots,
+each coupled to its own pair of leads. Local Holstein type electron-phonon
+coupling at the dots is assumed. To study many-body effects we use the finite-U
+mean-field slave boson approach. For vanishing interdot interaction, weak e-ph
+coupling and finite tunneling, molecular orbital spin Kondo effects occur for
+single electron or single hole occupations. Phonons influence both correlations
+and tunneling and additionally they shift the energies of the dots. Depending
+on the dot energies and the strength of electron-phonon coupling, the system is
+occupied by a different number of electrons that effectively interact with each
+other repulsively or attractively leading to a number of different ground
+states of DQD. Among them are Kondo-like states with spin, orbital or charge
+correlations resulting from polaron cotunneling processes and states with
+magnetic intersite correlations.",2311.10509v1
+2012-12-31,Properties of Bose Gases with Raman-Induced Spin-Orbit Coupling,"In this paper we investigate the properties of Bose gases with Raman-induced
+spin-orbit(SO) coupling. It is found that the SO coupling can greatly modify
+the single particle density-of-state, and thus lead to non-monotonic behavior
+of the condensate depletion, the Lee-Huang-Yang correction of ground-state
+energy and the transition temperature of a non-interacting Bose-Einstein
+condensate. The presence of the SO coupling also breaks the Galilean
+invariance, and this gives two different critical velocities, corresponding to
+the movement of the condensate and the impurity respectively. Finally, we show
+that with SO coupling, the interactions modify the BEC transition temperature
+even at Hartree-Fock level, in contrast to the ordinary Bose gas without SO
+coupling. All results presented here can be directly verified in the current
+cold atom experiments using Raman laser-induced gauge field.",1212.6832v1
+2019-09-18,Influence of Rashba spin-orbit coupling on the 0-$π$ transition and Kondo temperature in 1D superconductors,"Using the framework of the density-matrix renormalization group (DMRG), we
+study a quantum dot coupled to a superconducting nanowire with strong Rashba
+spin-orbit coupling. Regarding the singlet-to-doublet ""0-$\pi$"" transition that
+takes place when the Kondo effect is overcome by the superconducting gap, we
+show that the Rashba coupling modifies the critical values at which the
+transition occurs, favouring the doublet phase. In addition, using a
+generalized Haldane's formula for the Kondo temperature $T_K$, we show that it
+is lowered by the Rashba coupling. We benchmark our DMRG results comparing them
+with previous numerical renormalization group (NRG) results. The excellent
+agreement obtained opens the possibility of studying chains or clusters of
+impurities coupled to superconductors by the means of DMRG.",1909.08486v1
+2021-10-01,Modulational Instabity of Spin-Orbit Coupled Bose-Einstein Condensates in Discrete Media,"We address the impact of intra-site spin-orbit (SO) coupling and associated
+inter-component Rabi coupling on the modulational instability (MI) of
+plane-wave states in two-component discrete Bose-Einstein condensates (BECs).
+Conditions for the onset of the MI and the respective instability are found
+analytically. SO coupling allows us to produce the MI even for a small initial
+wavenumber (q < {\pi}/2) for miscible states. In particular, SO coupling
+introduces MI even in the absence of hopping coefficient, a concept which may
+have wider ramifications in heavy atomic BECs. Our investigations predict that
+the impact of Rabi coupling is more pronounced compared to the other system
+parameters. We have also shown how our results of the linear stability analysis
+can be corroborated numerically. The fact that we have brought out the
+stability criteria in different domains of system parameters means that our
+model is tailor made experiments.",2110.00288v1
+2023-06-28,Domain formation of modulation instability in spin-orbit-Rabi coupled Gross-Pitaevskii equation with cubic-quintic interactions,"The effect of two- and three-body interactions on the modulation instability
+(MI) domain formation of a spin-orbit (SO) and Rabi-coupled Bose-Einstein
+condensate is studied within a quasi-one-dimensional model. To this aim, we
+perform numerical and analytical investigations of the associated dispersion
+relations derived from the corresponding coupled Gross-Pitaevskii equation. The
+interplay between the linear (SO and Rabi) couplings with the nonlinear
+cubic-quintic interactions are explored in the mixture, considering miscible
+and immiscible configurations, with a focus on the impact in the analysis of
+experimental realizations with general binary coupled systems, in which
+nonlinear interactions can be widely varied together with linear couplings.",2306.16599v1
+2011-12-11,Spin-to-charge conversion in lateral and vertical topological-insulator/ferromagnet heterostructures with microwave-driven precessing magnetization,"Using the charge-conserving Floquet-Green function approach to open quantum
+systems driven by external time periodic potential, we analyze how spin current
+pumped (in the absence of any dc bias voltage) by the precessing magnetization
+of a ferromagnetic (F) layer is injected {\em laterally} into the interface
+with strong spin-orbit coupling (SOC) and converted into charge current flowing
+in the same direction. In the case of metallic interface with the Rashba SOC
+used in experiments [Nature Comm. {\bf 4}, 2944 (2013)], both spin
+$I^{S_\alpha}$ and charge $I$ current flow within it where $I/I^{S_\alpha}
+\simeq$ 2--8\% (depending on the precession cone angle), while for
+F/topological-insulator (F/TI) interface employed in related experiments
+(arXiv:1312.7091) the conversion efficiency is greatly enhanced $I/I^{S_\alpha}
+\simeq$ 40--60\% due to perfect spin-momentum locking on the surface of TI. The
+spin-to-charge conversion occurs also when spin current is pumped {\em
+vertically} through the F/TI interface with smaller efficiency $I/I^{S_\alpha}
+\sim 0.001\%$, but with charge current signal being sensitive to whether the
+Dirac fermions at the interface are massive or massless.",1112.2314v2
+2014-01-27,Helical order in one-dimensional magnetic atom chains and possible emergence of Majorana bound states,"We theoretically obtain the phase diagram of localized magnetic impurity
+spins arranged in a one-dimensional chain on top of a one- or two-dimensional
+electron gas with Rashba spin-orbit coupling. The interactions between the
+spins are mediated by the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism
+through the electron gas. Recent work predicts that such a system may
+intrinsically support topological superconductivity when a helical spin-density
+wave is formed in the spins, and superconductivity is induced in the electron
+gas. We analyze, using both analytical and numerical techniques, the conditions
+under which such a helical spin state is stable in a realistic situation in the
+presence of disorder. We show that it becomes unstable towards the formation of
+(anti) ferromagnetic domains if the disorder in the impurity spin positions
+$\delta R$ becomes comparable with the Fermi wave length. We also examine the
+stability of the helical state against Gaussian potential disorder in the
+electronic system using a diagrammatic approach. Our results suggest that in
+order to stabilize the helical spin state, and thus the emergent topological
+superconductivity, a sufficiently strong Rashba spin-orbit coupling, giving
+rise to Dzyaloshinskii-Moriya interactions, is required.",1401.7048v2
+2015-04-07,Spin Transport in Hydrogenated Graphene,"In this review we discuss the multifaceted problem of spin transport in
+hydrogenated graphene from a theoretical perspective. The current experimental
+findings suggest that hydrogenation can either increase or decrease spin
+lifetimes, which calls for clarification. We first discuss the spin-orbit
+coupling induced by local $\sigma-\pi$ re-hybridization and ${\bf sp}^{3}$ C-H
+defect formation together with the formation of a local magnetic moment.
+First-principles calculations of hydrogenated graphene unravel the strong
+interplay of spin-orbit and exchange couplings. The concept of magnetic
+scattering resonances, recently introduced \cite{Kochan2014} is revisited by
+describing the local magnetism through the self-consistent Hubbard model in the
+mean field approximation in the dilute limit, while spin relaxation lengths and
+transport times are computed using an efficient real space order N wavepacket
+propagation method. Typical spin lifetimes on the order of 1 nanosecond are
+obtained for 1 ppm of hydrogen impurities (corresponding to transport time
+about 50 ps), and the scaling of spin lifetimes with impurity density is
+described by the Elliott-Yafet mechanism. This reinforces the statement that
+magnetism is the origin of the substantial spin polarization loss in the
+ultraclean graphene limit.",1504.01591v1
+2017-02-16,Theory of current-induced spin polarizations in an electron gas,"We derive the Bloch equations for the spin dynamics of a two-dimensional
+electron gas in the presence of spin-orbit coupling. For the latter we consider
+both the intrinsic mechanisms of structure inversion asymmetry (Rashba) and
+bulk inversion asymmetry (Dresselhaus), and the extrinsic ones arising from the
+scattering from impurities. The derivation is based on the SU(2) gauge-field
+formulation of the Rashba-Dresselhaus spin-orbit coupling. Our main result is
+the identification of a new spin-generation torque arising from the
+Elliot-Yafet process, which opposes a similar term arising from the
+Dyakonov-Perel process. The new spin-generation torque contributes to the
+current-induced spin polarization (CISP) -- also known as the Edelstein or
+inverse spin-galvanic effect. As a result, the behavior of the CISP turns out
+to be more complex than one would surmise from consideration of the internal
+Rashba-Dresselhaus fields alone. In particular, the symmetry of the
+current-induced spin polarization does not necessarily coincide with that of
+the internal Rashba-Dresselhaus field, and an out-of-plane component of the
+CISP is generally predicted, as observed in recent experiments. We also discuss
+the extension to the three-dimensional electron gas, which may be relevant for
+the interpretation of experiments in thin films.",1702.04887v1
+2022-07-18,Switchable large-gap quantum spin Hall state in two-dimensional MSi$_2$Z$_4$ materials class,"Quantum spin Hall (QSH) insulators exhibit spin-polarized conducting edge
+states that are topologically protected from backscattering and offer unique
+opportunities for addressing fundamental science questions and device
+applications. Finding viable materials that host such topological states,
+however, remains a challenge. Here by using in-depth first-principles
+theoretical modeling, we predict large bandgap QSH insulators in recently
+bottom-up synthesized two-dimensional (2D) MSi$_2$Z$_4$ (M = Mo or W and Z = P
+or As) materials family with $1T^\prime$ structure. A structural distortion in
+the $2H$ phase drives a band inversion between the metal (Mo/W) $d$ and $p$
+states of P/As to realize spinless Dirac cone states without spin-orbit
+coupling. When spin-orbit coupling is included, a hybridization gap as large as
+$\sim 204$ meV opens up at the band crossing points, realizing spin-polarized
+conducting edge states with nearly quantized spin Hall conductivity. We also
+show that the inverted band gap is tunable with a vertical electric field which
+drives a topological phase transition from the QSH to a trivial insulator with
+Rashba-like edge states. Our study identifies 2D MSi$_2$Z$_4$ materials family
+with $1T^\prime$ structure as large bandgap, tunable QSH insulators with
+protected spin-polarized edge states and large spin-Hall conductivity.",2207.08407v1
+2023-09-23,Strong unidirectional Rashba state induced by extended vacancy line defects in a $1T'$-WTe$_{2}$ monolayer,"The correlation between spin-orbit coupling and low crystal symmetry in the
+$1T'$ phase of the tungsten ditellurides (WTe$_{2}$) monolayer (ML) plays a
+significant role in its electronic and topological properties. However, the
+centrosymmetric nature of the crystal maintains Kramer's spin degeneracy in its
+electronic states, which limits its functionality in spintronics. In this
+paper, through a systematic study using first-principles calculations, we show
+that significant spin splitting can be induced in the $1T'$-WTe$_{2}$ ML by
+introducing one dimensional (1D) vacancy line defect (VLD). We examine six
+configurations of the 1D VLD, which consist of three VLDs extended in the
+armchair direction including a Te$_{1}$ armchair-VLD ($ACV_{\texttt{Te}_{1}}$),
+Te$_{2}$ armchair-VLD ($ACV_{\texttt{Te}_{2}}$), and W armchair-VLD
+($ACV_{\texttt{W}}$); and three VLDs elongated along the zigzag direction
+comprising a Te$_{1}$ zigzag-VLD ($ZZV_{\texttt{Te}_{1}}$), Te$_{2}$ zigzag-VLD
+($ZZV_{\texttt{Te}_{2}}$), and W zigzag-VLD ($ZZV_{\texttt{W}}$), where
+Te$_{1}$ and Te$_{2}$ are two nonequivalent Te atoms located at the lower and
+higher sites in the top layer, respectively. We find that both the
+$ACV_{\texttt{Te}_{1}}$ and $ACV_{\texttt{W}}$ systems have the lowest
+formation energy. Concerning these two most stable VLD systems, we identify
+large spin splitting in the defect states near the Fermi level driven by a
+strong coupling of the in-plane $p-d$ orbitals, displaying highly
+unidirectional Rashba states with perfectly collinear spin configurations in
+the momentum space. This unique spin configuration gives rise to a specific
+spin mode that protects the spin from decoherence and leads to an exceptionally
+long spin lifetime...........",2309.13234v2
+2020-05-18,Confinement versus interface bound states in spin-orbit coupled nanowires,"Semiconductor nanowires with strong Rashba spin-orbit coupling are currently
+on the spotlight of several research fields such as spintronics, topological
+materials and quantum computation. While most theoretical models assume an
+infinitely long nanowire, in actual experimental setups the nanowire has a
+finite length, is contacted to metallic electrodes and is partly covered by
+gates. By taking these effects into account through an inhomogeneous spin-orbit
+coupling profile, we show that in general two types of bound states arise in
+the nanowire, namely confinement bound states and interface bound states. The
+appearance of confinement bound states, related to the finite length of the
+nanowire, is favoured by a mismatch of the bulk band bottoms characterizing the
+lead and the nanowire, and occurs even in the absence of magnetic field. In
+contrast, an interface bound states may only appear if a magnetic field applied
+perpendicularly to the spin-orbit field direction overcomes a critical value,
+and is favoured by an alignment of the band bottoms of the two regions across
+the interface. We describe in details the emergence of these two types of bound
+states, pointing out their differences. Furthermore, we show that when a
+nanowire portion is covered by a gate the application of a magnetic field can
+change the nature of the electronic ground state from a confinement to an
+interface bound state, determining a redistribution of the electron charge.",2005.08587v2
+2022-07-05,Spin-orbit coupling and electron scattering in high-quality InSb$_{1-x}$As$_{x}$ quantum wells,"InSb$_{1-x}$As$_{x}$ is a promising material system for exploration of
+topological superconductivity in hybrid superconductor/semiconductor devices
+due to large effective g-factor and enhanced spin-orbit coupling when compared
+to binary InSb and InAs. Much remains to be understood concerning the
+fundamental properties of the two-dimensional electron gas (2DEG) in InSbAs
+quantum wells. We report on the electrical properties of a series of 30 nm
+InSb$_{1-x}$As$_{x}$ quantum wells grown 40 nm below the surface with three
+different arsenic mole fractions, x = 0.05, 0.13 and 0.19. The dependencies of
+mobility on 2DEG density and arsenic mole fraction are analyzed. For the x =
+0.05 sample, the 2DEG displays a peak mobility $\mu$ = 2.4 $\times$ 10$^5$
+cm$^2$/Vs at a density of n = 2.5 $\times$ 10$^{11}$ cm$^{-2}$. High mobility,
+small effective mass, and strong spin-orbit coupling result in beating in the
+Shubnikov de Hass oscillations at low magnetic field. Fourier analysis of the
+Shubnikov de Haas oscillations facilitates extraction of the Rashba spin-orbit
+parameter ${\alpha}$ as a function of 2DEG density and quantum well mole
+fraction. For x = 0.19 at n = 3.1 $\times$ 10$^{11}$ cm$^{-2}$, ${\alpha}$
+$\approx$ 300 meV$\r{A}$, among the highest reported values in III-V materials.",2207.02006v1
+2022-08-02,Spin-Orbital States and Strong Antiferromagnetism of Layered Eu$_2$SrFe$_2$O$_6$ and Sr$_3$Fe$_2$O$_4$Cl$_2$,"The insulating iron compounds Eu$_2$SrFe$_2$O$_6$ and Sr$_3$Fe$_2$O$_4$Cl$_2$
+have high-temperature antiferromagnetic (AF) order despite their different
+layered structures. Here we carry out density functional calculations and Monte
+Carlo simulations to study their electronic structures and magnetic properties
+aided with analyses of the crystal field, magnetic anisotropy, and
+superexchange. We find that both compounds are Mott insulators and in the
+high-spin (HS) Fe$^{2+}$ state ($S$ = 2) accompanied by the weakened crystal
+field. Although they have different local coordination and crystal fields, the
+Fe$^{2+}$ ions have the same level sequence and ground-state configuration
+$(3z^2-r^2)^2(xz,yz)^2(xy)^1(x^2-y^2)^1$. Then, the multiorbital superexchange
+produces strong AF couplings, and the $(3z^2-r^2)/(xz,yz)$ mixing via the
+spin-orbit coupling (SOC) yields a small in-plane orbital moment and
+anisotropy. Indeed, by tracing a set of different spin-orbital states, our
+density functional calculations confirm the strong AF couplings and the easy
+planar magnetization for both compounds. Moreover, using the derived magnetic
+parameters, our Monte Carlo simulations give the N\'eel temperature $T_{\rm N}$
+= 420 K (372 K) for the former (the latter), which well reproduce the
+experimental results. Therefore, the present study provides a unified picture
+for Eu$_2$SrFe$_2$O$_6$ and Sr$_3$Fe$_2$O$_4$Cl$_2$ concerning their electronic
+and magnetic properties.",2208.01318v1
+2016-06-15,Spin-orbit coupling and strong electronic correlations in cyclic molecules,"In atoms spin-orbit coupling (SOC) cannot raise the angular momentum above a
+maximum value or lower it below a minimum. Here we show that this need not be
+the case in materials built from nanoscale structures including multi-nuclear
+coordination complexes, materials with decorated lattices, or atoms on
+surfaces. In such cyclic molecules the electronic spin couples to currents
+running around the molecule. For odd-fold symmetric molecules (e.g., odd
+membered rings) the SOC is highly analogous to the atomic case; but for
+even-fold symmetric molecules every angular momentum state can be both raised
+and lowered. These differences arise because for odd-fold symmetric molecules
+the maximum and minimum molecular orbital angular momentum states are time
+reversal conjugates, whereas for even-fold symmetric molecules they are aliases
+of the same single state. We show, from first principles calculations, that in
+suitable molecules this molecular SOC is large, compared to the energy
+differences between frontier molecular orbitals. Finally, we show that, when
+electronic correlations are strong, molecular SOC can cause highly anisotropic
+exchange interactions and discuss how this can lead to effective spin models
+with compass Hamiltonians.",1606.04605v4
+2017-05-06,Electrical and thermoelectric transport properties of two-dimensional fermionic systems with $k$-cubic spin-orbit coupling,"We investigate the effect of $k$-cubic spin-orbit interaction on electrical
+and thermoelectric transport properties of two-dimensional fermionic systems.
+We obtain exact analytical expressions of the inverse relaxation time (IRT) and
+the Drude conductivity for long-range Coulomb and short-range delta scattering
+potentials. The IRT reveals that the scattering is completely suppressed along
+the three directions $\theta^\prime = (2n+1)\pi/3 $ with $ n=1,2,3$. We also
+obtain analytical results of the thermopower and thermal conductivity at low
+temperature. The thermoelectric transport coefficients obey the Wiedemann-Franz
+law, even in the presence of $k$-cubic Rashba spin-orbit coupling (RSOC) at low
+temperature. In the presence of quantizing magnetic field, the signature of the
+RSOC is revealed through the appearance of the beating pattern in the
+Shubnikov-de Haas (SdH) oscillations of thermopower and thermal conductivity in
+low magnetic field regime. The empirical formulae for the SdH oscillation
+frequencies accurately describe the locations of the beating nodes. The beating
+pattern in magnetothermoelectric measurement can be used to extract the
+spin-orbit coupling constant.",1705.02483v2
+2021-11-14,Intrinsic first and higher-order topological superconductivity in a doped topological insulator,"We explore higher order topological superconductivity in an artificial Dirac
+material with intrinsic spin-orbit coupling, which is a doped $\mathbb{Z}_2$
+topological insulator in the normal state. A mechanism for superconductivity
+due to repulsive interactions -- $\mathit{pseudospin}$ $\mathit{pairing}$ --
+has recently been shown to naturally result in higher-order topology in Dirac
+systems past a minimum chemical potential \cite{Li2021}. Here we apply this
+theory through microscopic modeling of a superlattice potential imposed on an
+inversion symmetric hole-doped semiconductor heterostructure, known as
+hole-based semiconductor artificial graphene, and extend previous work to
+include the effects of spin-orbit coupling. We find that spin-orbit coupling
+enhances interaction effects, providing an experimental handle to increase the
+efficiency of the superconducting mechanism. We show that the phase diagram of
+these systems, as a function of chemical potential and interaction strength,
+contains three superconducting states -- a first-order topological $p+ip$
+state, a second-order topological spatially modulated $p+i\tau p$ state, and a
+second-order topological extended $s$-wave state, $s_\tau$. We calculate the
+symmetry-based indicators for the $p+i\tau p$ and $s_\tau$ states, which prove
+these states possess second-order topology. Exact diagonalisation results are
+presented which illustrate the interplay between the boundary physics and spin
+orbit interaction. We argue that this class of systems offer an experimental
+platform to engineer and explore first and higher-order topological
+superconducting states.",2111.07252v4
+2023-05-25,Delving into the anisotropic interlayer exchange in bilayer CrI$_3$,"Bilayer CrI$_3$ attracted much attention owing to peculiar switching between
+the layered ferromagnetic and antiferromagnetic order upon stacking
+alternation. This finding pointed out the importance of the apparently small
+interlayer exchange, yet, existing literature addresses only its isotropic
+part. To fill this gap, we combine the density functional theory with
+Hamiltonian modeling to examine the anisotropic interlayer exchange in bilayer
+CrI$_3$ - Dzyaloshinskii-Moriya (DMI) and the Kitaev interaction (KI). We
+develop and apply a novel computational procedure that yields the off-diagonal
+exchange matrix elements with $\mu$eV accuracy. Inspecting two types of bilayer
+stacking, we found a weak interlayer KI and much stronger DMI between the
+sublattices of monoclinic bilayer and their complete absence in rhombohedral
+bilayer. We show how these anisotropic interactions depend on the interlayer
+distance, stacking sequence, and the spin-orbit coupling strength and suggest
+the dominant superexchange processes at play. In addition, we demonstrate that
+the single-ion anisotropy largely depends on stacking, increasing by 50% from
+monoclinic to rhombohedral structure. Remarkably, our findings prove that
+iodines, owing to their spatially extended 5p orbitals featuring strong
+spin-orbit coupling, are extremely efficient in mediating DMI across the van
+der Waals gap in two-dimensional magnetic heterostructures. Given that similar
+findings were previously demonstrated only in metallic multilayers where the
+DMI shows a much longer range, our study gives promise that the chiral control
+of spin textures can be achieved in two-dimensional semiconducting magnetic
+bilayers whose ligands feature strong spin-orbit coupling.",2305.16142v1
+2024-03-04,BAGELS: A General Method for Minimizing the Rate of Radiative Depolarization in Electron Storage Rings,"We present a novel method for minimizing the effects of radiative
+depolarization in electron storage rings by use of vertical orbit bumps in the
+arcs. Electron polarization is directly characterized by the RMS of the
+so-called spin orbit coupling function in the bends. In the Electron Storage
+Ring (ESR) of the Electron-Ion Collider (EIC), as was the case in HERA, this
+function is excited by the spin rotators. Individual vertical corrector coils
+in the arcs can have varying impacts on this function globally. In this method,
+we use a singular value decomposition of the response matrix of the spin-orbit
+coupling function with each coil to define a minimal number of most effective
+groups of coils, motivating the name ""Best Adjustment Groups for ELectron Spin""
+(BAGELS) method. The BAGELS method can be used to minimize the depolarizing
+effects in an ideal lattice, and to obtain fine-tuning knobs to restore the
+minimization in rings with realistic closed orbit distortions. Furthermore, the
+least effective groups can instead be chosen for other applications where no
+impact on polarization is desirable, e.g. global coupling compensation or
+vertical emittance creation. Application of the BAGELS method has significantly
+increased the polarization in simulations of the 18 GeV ESR, beyond achievable
+with conventional methods.",2403.02103v1
+2020-02-21,Magnetic field effects on the quantum spin liquid behaviors of NaYbS$_2$,"Spin-orbit coupling is an important ingredient to regulate the many-body
+physics, especially for many spin liquid candidate materials such as rare-earth
+magnets and Kitaev materials. The rare-earth chalcogenides NaYbCh$_2$ (Ch = O,
+S, Se) is a congenital frustrating system to exhibit the intrinsic landmark of
+spin liquid by eliminating both the site disorders between Na$^{+}$ and
+Yb$^{3+}$ ions with the big ionic size difference and the Dzyaloshinskii-Moriya
+interaction with the perfect triangular lattice of the Yb$^{3+}$ ions. The
+temperature versus magnetic-field phase diagram is established by the
+magnetization, specific heat, and neutron-scattering measurements. Notably, the
+neutron diffraction spectra and the magnetization curve might provide
+microscopic evidence for a series of spin configuration for in-plane fields,
+which include the disordered spin liquid state, 120$^{o}$ antiferromagnet, and
+one-half magnetization state. Furthermore, the ground state is suggested to be
+a gapless spin liquid from inelastic neutron scattering, and the magnetic field
+adjusts the spin orbit coupling. Therefore, the strong spin-orbit coupling in
+the frustrated quantum magnet substantially enriches low-energy spin physics.
+This rare-earth family could offer a good platform for exploring the quantum
+spin liquid ground state and quantum magnetic transitions.",2002.09224v2
+2004-08-30,Magnetically-controlled impurities in quantum wires with strong Rashba coupling,"We investigate the effect of strong spin-orbit interaction on the electronic
+transport through non-magnetic impurities in one-dimensional systems. When a
+perpendicular magnetic field is applied, the electron spin polarization becomes
+momentum-dependent and spin-flip scattering appears, to first order in the
+applied field, in addition to the usual potential scattering. We analyze a
+situation in which, by tuning the Fermi level and the Rashba coupling, the
+magnetic field can suppress the potential scattering. This mechanism should
+give rise to a significant negative magnetoresistance in the limit of large
+barriers.",0408656v2
+2002-10-08,Quark spin coupling in baryons - revisited,"A direct connection can be made between mixing angles in negative parity
+baryons and the spin coupling of constituent quarks. The mixing angles do not
+depend on spectral data. These angles are recalculated for gluon exchange and
+pion exchange between quarks. For pion exchange the results of Glozman and
+Riska are corrected. The experimental data on mixing are very similar to those
+derived from gluon exchange but substantially different from the values
+obtained for pion exchange.",0210126v2
+1993-01-11,On the Electromagnetic Interactions of Anyons,"Using the appropriate representation of the Poincare group and a definition
+of minimal coupling, we discuss some aspects of the electromagnetic
+interactions of charged anyons. In a nonrelativistic expansion, we derive a
+Schrodinger-type equation for the anyon wave function which includes
+spin-magnetic field and spin-orbit couplings. In particular, the gyromagnetic
+ratio for charged anyons is shown to be 2; this last result is essentially a
+reflection of the fact that the spin is parallel to the momentum in (2+1)
+dimensions.",9301037v1
+1996-10-03,Low-energy interaction of composite spin-half systems with scalar and vector fields,"We consider a composite spin-half particle moving in spatially-varying scalar
+and vector fields. The vector field is assumed to couple to a conserved charge,
+but no assumption is made about either the structure of the composite or its
+coupling to the scalar field. A general form for the piece of the spin-orbit
+interaction of the composite with the scalar and vector fields which is
+first-order in momentum transfer ${\bf Q}$ and second-order in the fields is
+derived.",9610007v1
+2001-06-28,Anisotropic Spin Exchange in Pulsed Quantum Gates,"We show how to eliminate the first-order effects of the spin-orbit
+interaction in the performance of a two-qubit quantum gate. Our procedure
+involves tailoring the time dependence of the coupling between neighboring
+spins. We derive an effective Hamiltonian which permits a systematic analysis
+of this tailoring. Time-symmetric pulsing of the coupling automatically
+eliminates several undesirable terms in this Hamiltonian. Well chosen pulse
+shapes can produce an effectively isotropic exchange gate, which can be used in
+universal quantum computation with appropriate coding.",0106161v1
+2003-05-15,Quantum Mechanics in a Rotating Frame,"The rotating frame is considered in quantum mechanics on the basis of the
+position dependent boost relating this frame to the non rotating inertial
+frame. We derive the Sagnac phase shift and the spin coupling with the rotation
+in the non relativistic limit by a simple treatment. By taking the low energy
+limit of the Dirac equation with a spin connection, we obtain the Hamiltonian
+for the rotating frame, which gives rise to all the phase shifts discussed
+before. Furthermore, we obtain a new phase shift due to the spin-orbit
+coupling.",0305081v2
+2008-03-05,Fano-Rashba effect in quantum dots,"We consider the electronic transport through a Rashba quantum dot coupled to
+ferromagnetic leads. We show that the interference of localized electron states
+with resonant electron states leads to the appearance of the Fano-Rashba
+effect. This effect occurs due to the interference of bound levels of
+spin-polarized electrons with the continuum of electronic states with an
+opposite spin polarization. We investigate this Fano-Rashba effect as a
+function of the applied magnetic field and Rashba spin-orbit coupling.",0803.0671v1
+2009-11-03,Dzyaloshinskii-Moriya interaction in transport through single molecule transistors,"The Dzyaloshinskii-Moriya interaction is shown to result in a canting of
+spins in a single molecule transistor. We predict non-linear transport
+signatures of this effect induced by spin-orbit coupling for the generic case
+of a molecular dimer. The conductance is calculated using a master equation and
+is found to exhibit a non-trivial dependence on the magnitude and direction of
+an external magnetic field. We show how three-terminal transport measurements
+allow for a determination of the coupling-vector characterizing the
+Dzyaloshinskii-Moriya interaction. In particular, we show how its orientation,
+defining the intramolecular spin chirality, can be probed with ferromagnetic
+electrodes.",0911.0571v1
+2011-10-27,Superconductivity without Local Inversion Symmetry; Multi-layer Systems,"While multi-layer systems can possess global inversion centers, they can have
+regions with locally broken inversion symmetry. This can modify the
+superconducting properties of such a system. Here we analyze two dimensional
+multi-layer systems yielding spatially modulated antisymmetric spin-orbit
+coupling (ASOC) and discuss superconductivity with mixed parity order
+parameters. In particular, the influence of ASOC on the spin susceptibility is
+investigated at zero temperature. For weak inter-layer coupling we find an
+enhanced spin susceptibility induced by ASOC, which hints the potential
+importance of this aspect for superconducting phase in specially structured
+superlattices.",1110.6000v1
+2013-07-31,Approximate relativistic bound states of a particle in Yukawa field with Coulomb tensor interaction,"We obtain the approximate relativistic bound state of a spin-1/2 particle in
+the field of the Yukawa potential and a Coulomb-like tensor interaction with
+arbitrary spin-orbit coupling number k under the spin and pseudospin (p-spin)
+symmetries. The asymptotic iteration method is used to obtain energy
+eigenvalues and corresponding wave functions in their closed forms. Our
+numerical results show that the tensor interaction removes degeneracies between
+the spin and p-spin doublets and creates new degenerate doublets for various
+strengths of tensor coupling.",1307.8326v1
+2016-09-29,Phase space methods for the spin dynamics in condensed matter systems,"Using the phase-space formulation of quantum mechanics, we derive a
+four-component Wigner equation for a system composed of spin-1/2 fermions
+(typically, electrons) including the Zeeman effect and the spin-orbit coupling.
+This Wigner equation is coupled to the appropriate Maxwell equations to form a
+self-consistent mean-field model. A set of semiclassical Vlasov equations with
+spin effects is obtained by expanding the full quantum model to first order in
+the Planck constant. The corresponding hydrodynamic equations are derived by
+taking velocity moments of the phase-space distribution function. A simple
+closure relation is proposed to obtain a closed set of hydrodynamic equations.",1609.09472v1
+2014-03-19,Renormalization group study of interaction-driven quantum anomalous Hall and quantum spin Hall phases in quadratic band crossing systems,"It is shown that topological insulating phases driven by interactions can be
+realized without the need for spin-orbit coupling or large intersite
+interaction in a two-dimensional system of spin-1/2 fermions with a single pair
+of parabolically touching bands. Using a weak-coupling, Wilsonian
+renormalization group procedure, we show that a quantum anomalous Hall phase is
+realized for Hubbard interaction, while a quantum spin Hall phase is favored
+for longer-ranged interactions.",1403.4957v2
+2017-06-21,Quantum kinetic equations and anomalous non-equilibrium Cooper pair spin accumulation in Rashba wires with Zeeman splitting,"We derive the theoretical and numerical framework for investigating
+nonequilibrium properties of spin-orbit coupled wires with Zeeman splitting
+proximized by a superconductor in the non-linear diffusive regime. We
+demonstrate that the anisotropic behaviour of triplet Cooper pairs in this
+system leads to novel spin accumulation profiles tunable by the magnetic field
+and strength of applied voltage bias. This paves the way for enhanced
+manipulation of superconducting spintronic devices, and enables further
+investigation of nonequilibrium effects in proximity-coupled superconducting
+structures more generally.",1706.07058v2
+2018-09-18,Spin-triplet $f$-wave pairing in twisted bilayer graphene near 1/4 filling,"We investigate the twisted bilayer graphene by a two-orbital Hubbard model on
+the honeycomb lattice. The model is studied near 1/4 band filling by using the
+singular-mode functional renormalization group theory. Spin-triplet $f$-wave
+pairing is found from weak to moderate coupling limit of the local
+interactions, and is associated with the Hund's rule coupling and
+incommensurate spin fluctuations at moderate momenta.",1809.06772v1
+2021-04-15,Spin susceptibility of superconductors with strong spin-orbit coupling,"We show that in some trigonal and hexagonal crystals the Zeeman coupling of
+band electrons with an external magnetic field is strongly anisotropic and
+necessarily vanishes along the main symmetry axis. This leads to qualitative
+changes in the temperature dependence of the electron spin susceptibility in
+the superconducting state. In particular, the power-law exponents at low
+temperatures due to the contribution of the nodal quasiparticles are
+considerably modified compared to their textbook values.",2104.07734v1
+2013-02-20,Multiplet effects in orbital and spin ordering phenomena: A hybridization-expansion quantum impurity solver study,"Orbital and spin ordering phenomena in strongly correlated systems are
+commonly studied using the local-density approximation + dynamical mean-field
+theory approach. Typically, however, such simulations are restricted to
+simplified models (density-density Coulomb interactions, high symmetry
+couplings and few-band models). In this work we implement an efficient general
+hybridization-expansion continuous-time quantum Monte Carlo impurity solver
+(Krylov approach) which allows us to investigate orbital and spin ordering in a
+more realistic setting, including interactions that are often neglected (e.g.,
+spin-flip and pair-hopping terms), enlarged basis sets (full d versus eg),
+low-symmetry distortions, and reaching the very low-temperature (experimental)
+regime. We use this solver to study ordering phenomena in a selection of
+exemplary low-symmetry transition-metal oxides: LaMnO3 and rare-earth
+manganites as well as the perovskites CaVO3 and YTiO3. We show that spin-flip
+and pair hopping terms do not affect the Kugel-Khomskii orbital-order melting
+transition in rare-earth manganites, or the suppression of orbital fluctuations
+driven by crystal field and Coulomb repulsion. For the Mott insulator YTiO3 we
+find a ferromagnetic transition temperature 50 K, in remarkably good agreement
+with experiments. For LaMnO3 we show that the classical t2g-spin approximation,
+commonly adopted for studying manganites, yields indeed an occupied eg orbital
+in very good agreement with that obtained for the full d 5-orbital Hubbard
+model, while the spin-spin e_g-t_{2g} correlation function calculated from the
+full d model is 0.74, very close to the value expected for aligned eg and t2g
+spins; the eg spectral function matrix is also well reproduced. Finally, we
+show that the t2g screening reduces the eg-eg Coulomb repulsion by about 10%",1302.5068v1
+2006-05-28,Spin Hall effect in infinitely large and finite-size diffusive Rashba two-dimensional electron systems: A helicity-basis nonequilibrium Green's function approach,"A nonequilibrium Green's function approach is employed to investigate the
+spin-Hall effect in diffusive two-dimensional electron systems with Rashba
+spin-orbit interaction. Considering a long-range electron-impurity scattering
+potential in the self-consistent Born approximation, we find that the spin-Hall
+effect arises from two distinct interband polarizations in helicity basis: a
+disorder-unrelated polarization directly induced by the electric field and a
+polarization mediated by electron-impurity scattering. The disorder-unrelated
+polarization is associated with all electron states below the Fermi surface and
+produces the original intrinsic spin-Hall current, while the disorder-mediated
+polarization emerges with contribution from the electron states near the Fermi
+surface and gives rise to an additional contribution to the spin-Hall current.
+Within the diffusive regime, the total spin-Hall conductivity vanishes in {\it
+infinitely large} samples, independently of temperature, of the spin-orbit
+coupling constant, of the impurity density, and of the specific form of the
+electron-impurity scattering potential. However, in a {\it finite-size} Rashba
+two-dimensional semiconductor, the spin-Hall conductivity no longer always
+vanishes. Depending on the sample size in the micrometer range, it can be
+positive, zero or negative with a maximum absolute value reaching as large as
+$e/8\pi$ order of magnitude at low temperatures. As the sample size increases,
+the total spin-Hall conductivity oscillates with a decreasing amplitude. We
+also discuss the temperature dependence of the spin-Hall conductivity for
+different sample sizes.",0605687v1
+1999-03-11,Ordering and Fluctuation of Orbital and Lattice Distortion in Perovskite Manganese Oxides,"Roles of orbital and lattice degrees of freedom in strongly correlated
+systems are investigated to understand electronic properties of perovskite Mn
+oxides such as La_{1-x}Sr_{x}MnO_{3}. An extended double-exchange model
+containing Coulomb interaction, doubly degenerate orbitals and Jahn-Teller
+coupling is derived under full polarization of spins with two-dimensional
+anisotropy. Quantum fluctuation effects of Coulomb interaction and orbital
+degrees of freedom are investigated by using the quantum Monte Carlo method. In
+undoped states, it is crucial to consider both the Coulomb interaction and the
+Jahn-Teller coupling in reproducing characteristic hierarchy of energy scales
+among charge, orbital-lattice and spin degrees of freedom in experiments. Our
+numerical results quantitatively reproduce the charge gap amplitude as well as
+the stabilization energy and the amplitude of the cooperative Jahn-Teller
+distortion in undoped compounds. Upon doping of carriers, in the absence of the
+Jahn-Teller distortion, critical enhancement of both charge compressibility and
+orbital correlation length is found with decreasing doping concentration. These
+are discussed as origins of strong incoherence in charge dynamics. With the
+Jahn-Teller coupling in the doped region, collapse of the Jahn-Teller
+distortion and instability to phase separation are obtained and favorably
+compared with experiments. These provide a possible way to understand the
+complicated properties of lightly doped manganites.",9903183v2
+2002-11-21,Construction of microscopic model for f-electron systems on the basis of j-j coupling scheme,"We construct a microscopic model for f-electron systems, composed of
+f-electron hopping, Coulomb interaction, and crystalline electric field (CEF)
+terms. In order to clarify the meaning of one f-electron state, here the j-j
+coupling scheme is considered, since the spin-orbit interaction is generally
+large in f-electron systems. Thus, the f-electron state at each site is
+labelled by $\mu$, namely, the z-component of total angular momentum j. By
+paying due attention to f-orbital symmetry, the hopping amplitudes between
+f-electron states are expressed using Slater's integrals. The Coulomb
+interaction terms among the $\mu$-states are written by Slater-Condon or Racah
+parameters. Finally, the CEF terms are obtained from the table of Hutchings.
+The constructed Hamiltonian is regarded as an orbital degenerate Hubbard model,
+since it includes two pseudo-spin and three pseudo-orbital degrees of freedom.
+For practical purposes, it is further simplified into a couple of two-orbital
+models by discarding one of the three orbitals. One of those simplified models
+is here analyzed using the exact diagonalization method to clarify ground-state
+properties by evaluating several kinds of correlation functions. Especially,
+the superconducting pair correlation function in orbital degenerate systems is
+carefully calculated based on the concept of off-diagonal long-range order. We
+attempt to discuss a possible relation of the present results with experimental
+observations for recently discovered heavy fermion superconductors CeMIn$_5$
+(M=Ir, Co, and Rh), and a comprehensive scenario to understand superconducting
+and antiferromagnetic tendencies in the so-called ``115'' materials such as
+CeMIn$_5$, UMGa$_5$, and PuCoGa$_5$ from the microscopic viewpoint.",0211467v1
+2014-12-14,General ultracold scattering formalism with isotropic spin orbit coupling,"A general treatment of ultracold two-body scattering in the presence of
+isotropic spin-orbit coupling (SOC) is presented. Owing to the mixing of
+different partial wave channels, scattering with SOC is in general a coupled
+multichannel problem. A systematic method is introduced to analytically solve a
+class of coupled differential equations by recasting the coupled channel
+problem as a simple eigenvalue problem. The exact Green's matrix in the
+presence of SOC is found, which readily gives the scattering solutions for any
+two identical particles in any total angular momentum subspace having
+negligible center of mass momentum. Application of this formalism to two spin-1
+bosons shows the ubiquitous low energy threshold behavior for systems with
+isotropic SOC. A modified threshold behavior shows up, which does not occur for
+the spin-orbit coupled spin-1/2 system. We also confirm the parity-breaking
+mechanism for the spontaneous emergency of handedness, that has been proposed
+by Duan et. al. [1]. Additionally, a two-body bound state is found for any
+arbitrarily small and negative scattering length. Our study sheds light on the
+few-body side of SOC physics and provides one step towards understanding
+ultracold scattering in a non-Abelian gauge field.",1412.4420v1
+2003-06-20,Experimental Separation of Rashba and Dresselhaus Spin-Splittings in Semiconductor Quantum Wells,"The relative strengths of Rashba and Dresselhaus terms describing the
+spin-orbit coupling in semiconductor quantum well (QW) structures are extracted
+from photocurrent measurements on n-type InAs QWs containing a two-dimensional
+electron gas (2DEG). This novel technique makes use of the angular distribution
+of the spin-galvanic effect at certain directions of spin orientation in the
+plane of a QW. The ratio of the relevant Rashba and Dresselhaus coefficients
+can be deduced directly from experiment and does not relay on theoretically
+obtained quantities. Thus our experiments open a new way to determine the
+different contributions to spin-orbit coupling.",0306521v1
+2003-11-03,Rashba effect in 2D mesoscopic systems with transverse magnetic field,"We present semiclassical and quantum mechanical results for the effects of a
+strong magnetic field in Quantum Wires in the presence of Rashba Spin Orbit
+coupling. Analytical and numerical results show how the perturbation acts in
+the presence of a transverse magnetic field in the ballistic regime and we
+assume a strong reduction of the backward scattering interaction which could
+have some consequences for the Tomonaga-Luttinger transport. We analyze the
+spin texture due to the action of Spin Orbit coupling and magnetic field often
+referring to the semiclassical solutions that magnify the singular spin
+polarization: results are obtained for free electrons in a twodimensional
+electron gas and for electrons in a Quantum Wire.
+  We propose the systems as possible devices for the spin filtering at various
+regimes.",0311051v1
+2004-06-02,"Positional Disorder, Spin-Orbit Coupling and Frustration in GaMnAs","We study the magnetic properties of metallic GaMnAs. We calculate the
+effective RKKY interaction between Mn spins using several realistic models for
+the valence band structure of GaAs. We also study the effect of positional
+disorder of the Mn on the magnetic properties. We find that the interaction
+between two Mn spins is anisotropic due to spin-orbit coupling within both the
+so-called spherical approximation and in the more realistic six band model. The
+spherical approximation strongly overestimates this anistropy, especially for
+short distances between Mn ions. Using the obtained effective Hamiltonian we
+carry out Monte Carlo simulations of finite and zero temperature magnetization
+and find that, due to orientational frustration of the spins, non-collinear
+states appear in both valence band approximations for disordered, uncorrelated
+Mn impurities in the small concentration regime. Introducing correlations among
+the substitutional Mn positions or increasing the Mn concentration leads to an
+increase in the remnant magnetization at zero temperature and an almost fully
+polarized ferromagnetic state.",0406068v1
+2005-05-31,Signatures of spin-related phases in transport through regular polygons,"We address the subject of transport in one-dimensional ballistic polygon
+loops subject to Rashba spin-orbit coupling. We identify the role played by the
+polygon vertices in the accumulation of spin-related phases by studying
+interference effects as a function of the spin-orbit coupling strength. We find
+that the vertices act as strong spin-scattering centers that hinder the
+developing of Aharovov-Casher and Berry phases. In particular, we show that the
+oscillation frequency of interference pattern can be doubled by modifying the
+shape of the loop from a square to a circle.",0505750v2
+2005-09-26,Spin-orbit coupling in a Quantum Dot at high magnetic field,"We describe the simultaneous effects of the spin-orbit (SO) perturbation and
+a magnetic field $B$ on a disk shaped quantum dot (QD). {As it is known the}
+combination of electrostatic forces among the $N$ electrons confined in the QD
+and the Pauli principle can induce a spin polarization when $B$ (applied in the
+direction orthogonal to the QD) is above a threshold value. In the presence of
+an electric field parallel to $B$, coupled to the spin $ S $ by a Rashba term,
+we demonstrate that a symmetry breaking takes place: we can observe it by
+analyzing the splitting of the levels belonging to an unperturbed multiplet. We
+also discuss the competitive effects of the magnetic field, the SO perturbation
+and the electron electron interaction, in order to define the hierarchy of the
+states belonging to a multiplet. We demonstrate how this hierarchy depends on
+the QD's size. We show the spin texture due to the combined effects of the
+Rashba effect and the interaction responsible for the polarization.",0509654v1
+2006-10-27,Nonvanishing spin Hall currents in the presence of magnetic impurities,"The intrinsic spin Hall conductivity in a two dimensional electron gas with
+Rashba spin-orbit coupling is evaluated by taking account of anisotropic
+coupling between magnetic impurities and itinerant electrons. In our
+calculation Kubo's linear response formalism is employed and the vertex
+correction is considered. In the semiclassical limit $\mu \gg 1/\tau$, a
+non-vanishing spin Hall conductivity $\sigma^{}_{sH}$ is found to depend on the
+momentum relaxation time $\tau$, spin-orbit splitting $\Delta$ and the
+anisotropic coefficient of interaction between itinerant electrons and magnetic
+impurities. The clean limit of $\sigma^{}_{sH}$ is in the region of $e/8\pi
+\sim e/6\pi$, depending on the anisotropic coefficient.",0610776v2
+2007-08-08,Spin-orbital Kondo decoherence by environmental effects in capacitively coupled quantum dot devices,"Strong correlation effects in a capacitively coupled double quantum-dot setup
+were previously shown to provide the possibility of both entangling spin-charge
+degrees of freedom and realizing efficient spin-filtering operations by static
+gate-voltage manipulations. Motivated by the use of such a device for quantum
+computing, we study the influence of electromagnetic noise on a general
+spin-orbital Kondo model, and investigate the conditions for observing
+coherent, unitary transport, crucial to warrant efficient spin manipulations.
+We find a rich phase diagram, where low-energy properties sensitively depend on
+the impedance of the external environment and geometric parameters of the
+system. Relevant energy scales related to the Kondo temperature are also
+computed in a renormalization-group treatment, allowing to assess the
+robustness of the device against environmental effects.",0708.1092v2
+2008-02-14,Coriolis Effect in Optics: Unified Geometric Phase and Spin-Hall Effect,"We examine the spin-orbit coupling effects that appear when a wave carrying
+intrinsic angular momentum interacts with a medium. The Berry phase is shown to
+be a manifestation of the Coriolis effect in a non-inertial reference frame
+attached to the wave. In the most general case, when both the direction of
+propagation and the state of the wave are varied, the phase is given by a
+simple expression that unifies the spin redirection Berry phase and the
+Pancharatnam--Berry phase. The theory is supported by the experiment
+demonstrating the spin-orbit coupling of electromagnetic waves via a surface
+plasmon nano-structure. The measurements verify the unified geometric phase,
+demonstrated by the observed polarization-dependent shift (spin-Hall effect) of
+the waves.",0802.2114v2
+2009-04-20,Introduction to superconductivity in metals without inversion center,"This Chapter gives a brief introduction to some basic aspects metals and
+superconductors in crystal without inversion symmetry. In a first part we
+analyze some normal state properties which arise through antisymmetric
+spin-orbit coupling existing in non-centrosymmetric materials and show its
+influence on the de Haas-van Alphen effect. For the superconducting phase we
+introduce a multi-band formulation which naturally arises due the spin
+splitting of the bands by spin-orbit coupling. It will then be shown how the
+states can be symmetry classified and their relation to the original
+classification in even-parity spin-singlet and odd-parity spin-triplet pairing
+states. The general Ginzburg-Landau functional will be derived and applied to
+the nucleation of superconductivity in a magnetic field. It will be shown that
+magneto-electric effects can modify the standard paramagnetic limiting behavior
+drastically.",0904.2962v2
+2009-07-02,Tuning Molecule-Mediated Spin Coupling in Bottom-Up Fabricated Vanadium-TCNE Nanostructures,"We have fabricated hybrid magnetic complexes from V atoms and
+tetracyanoethylene (TCNE) ligands via atomic manipulation with a cryogenic
+scanning tunneling microscope. Using tunneling spectroscopy we observe
+spin-polarized molecular orbitals as well as Kondo behavior. For complexes
+having two V atoms, the Kondo behavior can be quenched for different molecular
+arrangements, even as the spin-polarized orbitals remain unchanged. This is
+explained by variable spin-spin (i.e., V-V) ferromagnetic coupling through a
+single TCNE molecule, as supported by density functional calculations.",0907.0490v1
+2010-07-28,Band topology and quantum spin Hall effect in bilayer graphene,"We consider bilayer graphene in the presence of spin orbit coupling, to
+assess its behavior as a topological insulator. The first Chern number $n$ for
+the energy bands of single and bilayer graphene is computed and compared. It is
+shown that for a given valley and spin, $n$ in a bilayer is doubled with
+respect to the monolayer. This implies that bilayer graphene will have twice as
+many edge states as single layer graphene, which we confirm with numerical
+calculations and analytically in the case of an armchair terminated surface.
+Bilayer graphene is a weak topological insulator, whose surface spectrum is
+susceptible to gap opening under spin-mixing perturbations. We also assess the
+stability of the associated topological bulk state of bilayer graphene under
+various perturbations. Finally, we consider an intermediate situation in which
+only one of the two layers has spin orbit coupling, and find that although
+individual valleys have non-trivial Chern numbers, the spectrum as a whole is
+not gapped, so that the system is not a topological insulator.",1007.4910v1
+2012-12-19,Quantum spin Hall effect induced by electric field in silicene,"We investigate the transport properties in a zigzag silicene nanoribbon in
+the presence of an external electric field. The staggered sublattice potential
+and two kinds of Rashba spin-orbit couplings can be induced by the external
+electric field due to the buckled structure of the silicene. A bulk gap is
+opened by the staggered potential and gapless edge states appear in the gap by
+tuning the two kinds of Rashba spin-orbit couplings properly. Furthermore, the
+gapless edge states are spin-filtered and are insensitive to the non-magnetic
+disorder. These results prove that the quantum spin Hall effect can be induced
+by an external electric field in silicene, which may have certain practical
+significance in applications for future spintronics device.",1212.4577v1
+2014-02-28,Simulating systems of itinerant spin-carrying particles using arrays of superconducting qubits and resonators,"We propose possible approaches for the quantum simulation of itinerant
+spin-carrying particles in a superconducting qubit-resonator array. The
+standard Jaynes-Cummings-Hubbard setup considered in several recent studies can
+readily be used as a quantum simulator for a number of relevant phenomena,
+including the interaction with external magnetic fields and spin-orbit
+coupling. A more complex setup where multiple qubits and multiple resonator
+modes are utilized in the simulation gives a higher level of complexity,
+including the simulation of particles with high spin values and allowing more
+direct control on processes related to spin-orbit coupling. This proposal could
+be implemented in state-of-the-art superconducting circuits in the near future.",1402.7185v2
+2014-07-10,Supersolid with nontrivial topological spin textures in spin-orbit-coupled Bose gases,"Supersolid is a long-sought exotic phase of matter, which is characterized by
+the coexistence of a diagonal long-range order of solid and an off-diagonal
+long-range order of superfluid. Possible candidates to realize such a phase
+have been previously considered, including hard-core bosons with long-range
+interaction and soft-core bosons. Here we demonstrate that an ultracold atomic
+condensate of hard-core bosons with contact interaction can establish a
+supersolid phase when simultaneously subjected to spin-orbit coupling and a
+spin-dependent periodic potential. This supersolid phase is accompanied by
+topologically nontrivial spin textures, and is signaled by the separation of
+momentum distribution peaks, which can be detected via time-of-flight
+measurements. We also discuss possibilities to produce and observe the
+supersolid phase for realistic experimental situations.",1407.2972v2
+2014-07-12,Possible Half Metallic Antiferromagnetism in a Double Perovskite Material with Strong Spin-Orbit Couplings,"Using the first-principles density functional approach, we investigate a
+material Pr$_2$MgIrO$_6$ (PMIO) of double perovskite structure synthesized
+recently. According to the calculations, PMIO is a magnetic Mott-Hubbard
+insulator influenced by the cooperative effect of spin-orbit coupling (SOC) and
+Coulomb interactions of Ir-5$d$ and Pr-4$f$ electrons, as well as the crystal
+field. When Pr is replaced with Sr gradually, the system exhibits half metallic
+(HM) states desirable for spintronics applications. In
+[Pr$_{2-x}$Sr$_x$MgIrO$_6$]$_2$, HM antiferromagnetism (HMAFM) with zero spin
+magnetization in the unit cell is obtained for $x=1$, whereas for $x=0.5$ and
+1.5 HM ferrimagnetism (HMFiM) is observed with $\mu_{\rm tot}=3\mu_{\rm B}$ and
+$\mu_{\rm tot}=-3\mu_{\rm B}$ per unit cell respectively. It is emphasized that
+the large exchange splitting between spin-up and spin-down bands at the Fermi
+level makes the half metallicity possible even with strong SOC.",1407.3408v1
+2014-10-13,Spin-polarized dynamic transport in tubular two-dimensional electron gases,"The ac conductance of a finite tubular two-dimensional electron gas is
+studied in the presence of the Rashba spin-orbit interaction. When the tube is
+coupled to two reservoirs, that interaction splits the steps in the dc current,
+introducing energy ranges with spin-polarized currents. For this setup, we
+calculate the current-current correlations (the noise spectrum) and show that
+the existence of these dc spin-polarized currents can be deduced from the shot
+noise. We also find that the Wigner-Smith time delay is almost unaffected by
+the spin-orbit interaction. When the tube is coupled to a single reservoir, we
+calculate the quantum capacitance and the charge-relaxation resistance, and
+find that they exhibit singularities near the openings of new channels.",1410.3262v1
+2014-12-03,Valley Zeeman effect and spin-valley polarized conductance in monolayer MoS$_2$ in a perpendicular magnetic field,"We study the effect of a perpendicular magnetic field on the electronic
+structure and charge transport of a monolayer MoS$_2$ nanoribbon at zero
+temperature. We particularly explore the induced valley Zeeman effect through
+the coupling between the magnetic field, $B$, and the orbital magnetic moment.
+We show that the effective two-band Hamiltonian provides a mismatch between the
+valley Zeeman coupling in the conduction and valence bands due to the effective
+mass asymmetry and it is proportional to $B^2$ similar to the diamagnetic shift
+of exciton binding energies. However, the dominant term which evolves with $B$
+linearly, originates from the multi-orbital and multi-band structures of the
+system. Besides, we investigate the transport properties of the system by
+calculating the spin-valley resolved conductance and show that, in a low-hole
+doped case, the transport channels at the edge are chiral for one of the spin
+components. This leads to a localization of the non-chiral spin component in
+the presence of disorder and thus provides a spin-valley polarized transport
+induced by disorder.",1412.1459v3
+2015-02-16,Cyclotron Dynamics of a Kondo Singlet in a Spin-Orbit-Coupled Alkaline-Earth Atomic Gas,"We propose a scheme to investigate the interplay between Kondo-exchange
+interaction and quantum spin Hall effect with ultracold fermionic
+alkaline-earth atoms trapped in two-dimensional optical lattices using
+ultracold collision and laser-assisted tunneling. In the strong Kondo-coupling
+regime, though the loop trajectory of the mobile atom disappears, collective
+dynamics of an atom pair in two clock states can exhibit an unexpected
+spin-dependent cyclotron orbit in a plaquette, realizing the quantum spin Hall
+effect of the Kondo singlet. We demonstrate that the collective cyclotron
+dynamics of the spin-zero Kondo singlet is governed by an effective
+Harper-Hofstadter model in addition to second-order diagonal tunneling.",1502.04422v1
+2015-02-16,Effect of non-uniform exchange field in ferromagnetic graphene,"We have presented here the consequences of the non-uniform exchange field on
+the spin transport issues in spin chiral configuration of ferromagnetic
+graphene. Taking resort to the spin orbit coupling (SOC) term and non-uniform
+exchange coupling term we are successful to express the expression of Hall
+conductivity in terms of the exchange field and SOC parameters through the Kubo
+formula approach. However, for a specific configuration of the exchange
+parameter we have evaluated the Berry curvature of the system. We also have
+paid attention to the study of SU(2) gauge theory of ferromagnetic graphene.
+The generation of anti damping spin orbit torque in spin chiral magnetic
+graphene is also briefly discussed.",1502.04453v1
+2015-03-12,Emergence of Quantum Nonmagnetic Insulating Phase in Spin-Orbit Coupled Square Lattices,"We investigate the metal-insulator transition (MIT) and phase diagram of the
+half-filled Fermi Hubbard model with Rashba-type spin-orbit coupling (SOC) on a
+square optical lattice. The interplay between the atomic interactions and SOC
+results in distinctive features of the MIT. Significantly, in addition to the
+diverse spin ordered phases, a nonmagnetic insulating phase emerges in a
+considerably large regime of parameters near the Mott transition. This phase
+has a finite single-particle gap but vanishing magnetization and spin
+correlation exhibits a power-law scaling, suggesting a potential algebraic
+spin-liquid ground state. These results are confirmed by the non-perturbative
+cluster dynamical mean-field theory.",1503.03545v1
+2015-06-09,Experimental realization of a two-dimensional synthetic spin-orbit coupling in ultracold Fermi gases,"Spin-orbit coupling (SOC) is central to many physical phenomena, including
+fine structures of atomic spectra and quantum topological matters. Whereas SOC
+is in general fixed in a physical system, atom-laser interaction provides
+physicists a unique means to create and control synthetic SOC for ultracold
+atoms \cite{Dalibard}. Though significant experimental progresses have been
+made, a bottleneck in current studies is the lack of a two-dimensional (2D)
+synthetic SOC, which is crucial for realizing high-dimensional topological
+matters. Here, we report the experimental realization of 2D SOC in ultracold
+$^{40}$K Fermi gases using three lasers, each of which dresses one atomic
+hyperfine spin state. Through spin injection radio-frequency (rf) spectroscopy,
+we probe the spin-resolved energy dispersions of dressed atoms, and observe a
+highly controllable Dirac point created by the 2D SOC. Our work paves the way
+for exploring high-dimensional topological matters in ultracold atoms using
+Raman schemes.",1506.02861v1
+2015-06-23,BCS-BEC crossover of Spin Polarized Fermi Gases with Rashba Spin-Orbit Coupling,"We study the BCS-Bose Einstein Condensation (BEC) crossover of a three
+dimensional spin polarized Fermi gas with Rashba spin-orbital-coupling (SOC).
+At finite temperature, the effects of non-condensed pairs due to the thermal
+excitation are considered based on the $G_0G$ pair fluctuation theory. These
+fluctuations generate a pseudogap even persistent above $T_c$. Within this
+framework, the Sarma state or the spin polarized superfluid state and polarized
+pseudogap state are explored in detail. The resulting $T_c$ curves show that
+the enhancement of pairing due to the SOC roughly cancels out the suppression
+of pairing due to the population imbalance. Thus we observed that in a large
+portion of the parameter space, the polarized superfluid state are stabilized
+by the SOC.",1506.07064v1
+2015-06-25,Conserved Spin Quantity in Strained Hole Systems with Rashba and Dresselhaus Spin-Orbit Coupling,"We derive an effective Hamiltonian for a (001)-confined quasi-two-dimensional
+hole gas in a strained zincblende semiconductor heterostructure including both
+Rashba and Dresselhaus spin-orbit coupling. In the presence of uniaxial strain
+along the $\left\langle110\right\rangle$ axes, we find a conserved spin
+quantity in the vicinity of the Fermi contours in the lowest valence subband.
+In contrast to previous works, this quantity meets realistic requirements for
+the Luttinger parameters. For more restrictive conditions, we even find a
+conserved spin quantity for vanishing strain, restricted to the vicinity of the
+Fermi surface.",1506.07639v3
+2015-07-09,New Perspectives for Rashba Spin-Orbit Coupling,"In 1984, Bychkov and Rashba introduced a simple form of spin-orbit coupling
+to explain certain peculiarities in the electron spin resonance of
+two-dimensional semiconductors. Over the past thirty years, similar ideas have
+been leading to a vast number of predictions, discoveries, and innovative
+concepts far beyond semiconductors. The past decade has been particularly
+creative with the realizations of means to manipulate spin orientation by
+moving electrons in space, controlling electron trajectories using spin as a
+steering wheel, and with the discovery of new topological classes of materials.
+These developments reinvigorated the interest of physicists and materials
+scientists in the development of inversion asymmetric structures ranging from
+layered graphene-like materials to cold atoms. This review presents the most
+remarkable recent and ongoing realizations of Rashba physics in condensed
+matter and beyond.",1507.02408v2
+2015-07-14,U(1) symmetry of the spin-orbit coupled Hubbard model on the Kagome lattice,"We study the symmetry properties of the single-band Hubbard model with
+general spin-orbit coupling (SOC) on the Kagome lattice. We show that the
+global U(1) spin-rotational symmetry is present in the Hubbard Hamiltonian
+owing to the inversion symmetry centered at sites. The corresponding spin
+Hamiltonian has, therefore, the SO(2) spin-rotational symmetry, which can be
+captured by including SOC non-perturbatively. The exact classical groundstates,
+which we obtain for arbitrary SOC, are governed by the SU(2) fluxes associated
+with SOC threading the constituent triangles. The groundstates break the SO(2)
+symmetry, and the associated Berezinsky-Kosterlitz-Thouless transition
+temperature is determined by the SU(2) fluxes through the triangles, which we
+confirm by finite temperature classical Monte Carlo simulation.",1507.03963v3
+2015-10-09,Electron Spin Resonance in a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling,"Electron spin resonance (ESR) is usually interpreted as a single-particle
+phenomenon protected from the effect of many-body correlations. We show that
+this is not the case in a two-dimensional Fermi liquid (FL) with spin-orbit
+coupling (SOC). Depending on whether the magnetic field is below or above some
+critical value, ESR in such a system probes up to three collective chiral-spin
+modes, augmented by the presence of the field, or the Larmor mode, augmented
+both by SOC and FL renormalizations. We argue that ESR can be used as a probe
+not only for SOC but also for many-body physics.",1510.02534v2
+2016-01-10,"Interfacial Dzyaloshinskii-Moriya interaction, surface anisotropy energy,and spin pumping at spin orbit coupled Ir/Co interface","The interfacial Dzyaloshinskii-Moriya interaction (iDMI), surface anisotropy
+energy, and spin pumping at the Ir/Co interface are experimentally investigated
+by performing Brillouin light scattering. Contrary to previous reports, we
+suggest that the sign of the iDMI at the Ir/Co interface is the same as in the
+case of the Pt/Co interface. We also find that the magnitude of the iDMI energy
+density is relatively smaller than in the case of the Pt/Co interface, despite
+the large strong spin-orbit coupling (SOC) of Ir. The saturation magnetization
+and the perpendicular magnetic anisotropy (PMA) energy are significantly
+improved due to a strong SOC. Our findings suggest that an SOC in an Ir/Co
+system behaves in different ways for iDMI and PMA. Finally, we determine the
+spin pumping effect at the Ir/Co interface, and it increases the Gilbert
+damping constant from 0.012 to 0.024 for 1.5 nmthick Co.",1601.02210v3
+2016-02-22,Spin-orbit-coupling induced torque in ballistic domain walls: equivalence of charge-pumping and nonequilibrium magnetization formalisms,"To study the effect of spin-orbit coupling (SOC) on spin-transfer torque in
+magnetic materials, we have implemented two theoretical formalisms that can
+accommodate SOC. Using the ""charge-pumping"" formalism, we find two
+contributions to the out-of-plane spin-transfer torque parameter $\beta$ in
+ballistic Ni domain walls (DWs). For short DWs, the nonadiabatic reflection of
+conduction electrons caused by the rapid spatial variation of the exchange
+potential results in an out-of-plane torque that increases rapidly with
+decreasing DW length. For long DWs, the Fermi level conduction channel
+anisotropy that gives rise to an intrinsic DW resistance in the presence of SOC
+leads to a linear dependence of $\beta$ on the DW length. To understand this
+counterintuitive divergence of $\beta$ in the long DW limit, we use the
+""nonequilibrium magnetization"" formalism to examine the spatially resolved
+spin-transfer torque. The SOC-induced out-of-plane torque in ballistic DWs is
+found to be quantitatively consistent with the values obtained using the
+charge-pumping calculations indicating the equivalence of the two theoretical
+methods.",1602.06676v1
+2016-02-26,Generation of spin-dependent coherent states in a quantum wire,"We propose an all-electrically controlled nanodevice - a gated semiconductor
+nanowire - capable of generating a coherent state of a single electron trapped
+in a harmonic oscillator or superposition of such coherent states - the
+Schr\""odinger cat state. In the proposed scheme, electron in the ground state
+of the harmonic potential is driven by resonantly oscillating Rashba spin-orbit
+coupling. This allows for the creation of the Schr\""odinger cat state with
+superposition amplitudes depending on the initial electron spin state. Such a
+method can be used for initialization of a single spin qubit defined in a
+coherent state. The harmonic confinement potential along the InSb nanowire and
+the modulation of the Rashba spin-orbit coupling is obtained by proper gating.
+The results are supported by realistic three-dimensional time-dependent self
+consistent Poisson-Schr\""odinger calculations.",1602.08531v2
+2016-07-20,Magnetoelectric Andreev effect due to proximity-induced non-unitary triplet superconductivity in helical metals,"Non-centrosymmetric superconductors exhibit the magnetoelectric effect which
+manifests itself in the appearance of the magnetic spin polarization in
+response to a dissipationless electric current (supercurrent). While much
+attention has been dedicated to the thermodynamic version of this phenomenon
+(Edelstein effect), non-equilibrium transport magnetoelectric effects have not
+been explored yet. We propose the magnetoelectric Andreev effect (MAE) which
+consists in the generation of spin-polarized triplet Andreev conductance by an
+electric supercurrent. The MAE stems from the spin polarization of the
+Cooper-pair condensate due to a supercurrent-induced non-unitary triplet
+pairing. We propose the realization of such non-unitary pairing and MAE in
+superconducting proximity structures based on two-dimensional helical metals --
+strongly spin-orbit-coupled electronic systems with the Dirac spectrum such as
+the topological surface states. Our results uncover an unexplored route towards
+electrically controlled superconducting spintronics and are a smoking gun for
+induced unconventional superconductivity in spin-orbit-coupled materials.",1607.05880v2
+2017-08-25,Surface magnetism in a chiral d-wave superconductor with hexagonal symmetry,"Surface properties are examined in a chiral d-wave superconductor with
+hexagonal symmetry, whose one-body Hamiltonian possesses the intrinsic
+spin-orbit coupling identical to the one characterizing the topological nature
+of the Kane-Mele honeycomb insulator. In the normal state spin-orbit coupling
+gives rise to spontaneous surface spin currents, whereas in the superconducting
+state there exist besides the spin currents also charge surface currents, due
+to the chiral pairing symmetry. Interestingly, the combination of these two
+currents results in a surface spin polarization, whose spatial dependence is
+markedly different on the zigzag and armchair surfaces. We discuss various
+potential candidate materials, such as SrPtAs, which may exhibit these surface
+properties.",1708.07640v2
+2018-04-19,{\emph{Ab initio} magneto-optical spectrum of Group-IV -- Vacancy color centers in diamond,"Group-IV -- Vacancy color centers in diamond are fast emerging qubits that
+can be harnessed in quantum communication and sensor applications. There is an
+immediate quest for understanding their magneto-optical properties, in order to
+select the appropriate qubits for varying needs of particular quantum
+applications. Here we present results from cutting edge \emph{ab initio}
+calculations about the charge state stability, zero-phonon-line energies,
+spin-orbit and electron-phonon couplings for Group-IV -- Vacancy color centers.
+Based on the analysis of our results, we develop a novel spin Hamiltonian for
+these qubits which incorporates the interaction of the electron spin and orbit
+coupled with phonons beyond perturbation theory. Our results are in good
+agreement with previous data and predict a new defect for qubit applications
+with thermally initialized ground state spin and long spin coherence time.",1804.07004v1
+2018-04-30,Superfluid weight and Berezinskii-Kosterlitz-Thouless temperature of spin-imbalanced and spin-orbit-coupled Fulde-Ferrell phases in lattice systems,"We study the superfluid weight $D^s$ and Berezinskii-Kosterlitz-Thouless
+(BKT) transition temperatures $T_{BKT}$ in case of exotic Fulde-Ferrell (FF)
+superfluid states in lattice systems. We consider spin-imbalanced systems with
+and without spin-orbit coupling (SOC) accompanied with in-plane Zeeman field.
+By applying mean-field theory, we derive general equations for $D^s$ and
+$T_{BKT}$ in the presence of SOC and the Zeeman fields for 2D Fermi-Hubbard
+lattice models, and apply our results to a 2D square lattice. We show that
+conventional spin-imbalanced FF states without SOC can be observed at finite
+temperatures and that FF phases are further stabilized against thermal
+fluctuations by introducing SOC. We also propose how topologically non-trivial
+SOC-induced FF phases could be identified experimentally by studying the total
+density profiles. Furthermore, the relative behavior of transverse and
+longitudinal superfluid weight components and the role of the geometric
+superfluid contribution are discussed.",1804.11063v2
+2018-11-06,Chiral-induced switching of antiferromagnet spins in a confined nanowire,"In the development of spin-based electronic devices, a particular challenge
+is the manipulation of the magnetic state with high speed and low power
+consumption. Although research has focused on the current-induced spin-orbit
+torque based on strong spin-orbit coupling, the charge-based and the
+torque-driven devices have fundamental limitations: Joule heating, phase
+mismatching and overshooting. In this work, we investigate numerically and
+theoretically alternative switching scenario of antiferromagnetic insulator in
+one-dimensional confined nanowire sandwiched with two electrodes. As the
+electric field could break inversion symmetry and induce Dzyaloshinskii-Moriya
+interaction and pseudo-dipole anisotropy, the resulting spiral texture takes
+symmetric or antisymmetric configuration due to additional coupling with the
+crystalline anisotropy. Therefore, by competing two spiral states, we show that
+the magnetization reversal of antiferromagnets is realized, which is valid in
+ferromagnetic counterpart. Our finding provides promising opportunities to
+realize the rapid and energy-efficient electrical manipulation of magnetization
+for future spin-based electronic devices.",1811.02200v2
+2018-11-06,Superconductivity from the Condensation of Topological Defects in a Quantum Spin-Hall Insulator,"The discovery that spin-orbit coupling can generate a new state of matter in
+the form of quantum spin-Hall (QSH) insulators has brought topology to the
+forefront of condensed matter physics. While QSH states from spin-orbit
+coupling can be fully understood in terms of band theory, fascinating many-body
+effects are expected if the state instead results from interaction-generated
+symmetry breaking. In particular, topological defects of the corresponding
+order parameter provide a route to exotic quantum phase transitions. Here, we
+introduce a model in which the condensation of skyrmion defects in an
+interaction-generated QSH insulator produces a superconducting (SC) phase.
+Because vortex excitations of the latter carry a spin-$1/2$ degree of freedom
+numbers, the SC order may be understood as emerging from a gapless spin liquid
+normal state. The QSH-SC transition is an example of a deconfined quantum
+critical point (DQCP), for which we provide an improved model with only a
+single length scale that is accessible to large-scale quantum Monte Carlo
+simulations.",1811.02583v1
+2017-01-26,Exotic Spin Phases in Two Dimensional Spin-orbit Coupled Models: Importance of Quantum Fluctuation Effects,"We investigate the phase diagrams of the effective spin models derived from
+Fermi-Hubbard and Bose-Hubbard models with Rashba spin-orbit coupling, using
+string bond states, one of the quantum tensor network states methods. We focus
+on the role of quantum fluctuation effect in stabilizing the exotic spin phases
+in these models. For boson systems, and when the ratio between inter-particle
+and intra-particle interaction $\lambda > 1$, the out-of-plane ferromagnetic
+(FM) and antiferromagnetic (AFM) phases obtained from quantum simulations are
+the same to those obtained from classic model. However, the quantum
+order-by-disorder effect reduces the classical in-plane XY-FM and XY-vortex
+phases to the quantum X/Y-FM and X/Y-stripe phase when $\lambda < 1$. The
+spiral phase and skyrmion phase can be realized in the presence of quantum
+fluctuation. For the Fermi-Hubbard model, the quantum fluctuation energies are
+always important in the whole parameter regime. %, which are much larger than
+those of the Bose model. A general picture to understand the phase diagrams
+from symmetry point of view is also presented.",1701.07722v1
+2018-05-31,Spin-orbit coupling and resonances in the conductance of quantum wires,"We investigate a possibility of pair electron-electron e-e collisions in a
+ballistic wire with spin-orbit coupling and only one populated mode. Unlike in
+a spin-degenerate system, a combination of spin-splitting in momentum space
+with a momentum-dependent spin-precession opens up a finite phase space for
+pair e-e collisions around three distinct positions of the wire's chemical
+potential. For a short wire, we calculate corresponding resonant contributions
+to the conductance, which have different power-law temperature dependencies,
+and, in some cases, vanish if the wire's transverse confinement potential is
+symmetric. Our results may explain the recently observed feature at the lower
+conductance plateau in InAs wires.",1805.12385v2
+2015-12-04,Kondo screening in two-dimensional $p$-type transition-metal dichalcogenides,"Systems with strong spin orbit coupling support a number of new phases of
+matter and novel phenomena. This work focuses on the interplay of spin orbit
+coupling and interactions in yielding correlated phenomena in two dimensional
+transition metal dichalcogenides. In particular we explore the physics of Kondo
+screening resulting from the lack of centro-symmetry, large spin splitting and
+spin valley locking in hole doped systems. The key ingredients are i) valley
+dependent spin-momentum locking perpendicular to the two dimensional crystal;
+ii) single nondegenerate Fermi surface per valley, and iii) nontrivial Berry
+curvature associated with the low energy bands. The resulting Kondo resonance
+has a finite triplet component and nontrivial momentum space structure which
+facilitates new approaches to both probe and manipulate the correlated state.
+Using a variational wave function and the numerical renormalization group
+approaches we study the nature of the Kondo resonance both in the absence and
+presence of circularly polarized light. The latter induces an imbalance in the
+population of the two valleys leading to novel magnetic phenomena in the
+correlated state.",1512.01590v2
+2017-12-16,Bulk-edge correspondence and new topological phases in periodically driven spin-orbit coupled materials in the low frequency limit,"We study the topological phase transitions induced in spin-orbit coupled
+materials with buckling like silicene, germanene, stanene, etc, by circularly
+polarised light, beyond the high frequency regime, and unearth many new
+topological phases. These phases are characterised by the spin-resolved
+topological invariants, $C_0^\uparrow$, $C_0^\downarrow$, $C_\pi^\uparrow$ and
+$C_\pi^\downarrow$, which specify the spin-resolved edge states traversing the
+gaps at zero quasi-energy and the Floquet zone boundaries respectively. We show
+that for each phase boundary, and independently for each spin sector, the gap
+closure in the Brillouin zone occurs at a high symmetry point.",1712.05916v2
+2020-01-10,Bound fermion states in pinned vortices in the surface states of a superconducting topological insulator: The Majorana bound state,"By analytically solving the Bogoliubov-de Gennes equations we study the
+fermion bound states at the center of the core of a vortex in a two-dimensional
+superconductor. We consider three kinds of 2D superconducting models: (a) a
+standard type II superconductor in the mixed state with low density of vortex
+lines, (b) a superconductor with strong spin-orbit coupling locking the spin
+parallel to the momentum and (c) a superconductor with strong spin-orbit
+coupling locking the spin perpendicular to the momentum. The 2D superconducting
+states are induced via proximity effect between an $s$-wave superconductor and
+the surface states of a strong topological insulator. In case (a) the energy
+gap for the excitations is of order $\Delta_{\infty}^2/(2E_F)$, while for cases
+(b) and (c) a zero-energy Majorana state arises together with an equally spaced
+($\Delta^2_{\infty}/E_F$) sequence of fermion excitations. The spin-momentum
+locking is key to the formation of the Majorana state. We present analytical
+expressions for the energy spectrum and the wave functions.",2001.03666v2
+2018-03-02,Rashba proximity states in superconducting tunnel junctions,"We consider a new kind of superconducting proximity effect created by the
+tunneling of ""spin split"" Cooper pairs between two conventional superconductors
+connected by a normal conductor containing a quantum dot. The difference
+compared to the usual superconducting proximity effect is that the spin states
+of the tunneling Cooper pairs are split into singlet and triplet components by
+the electron spin-orbit coupling, which is assumed to be active in the normal
+conductor only. We demonstrate that the supercurrent carried by the spin-split
+Cooper pairs can be manipulated both mechanically and electrically for
+strengths of the spin-orbit coupling that can realistically be achieved by
+electrostatic gates.",1803.01725v1
+2018-12-12,Spin-Splitting and Rashba-Effect at Mono-Layer GaTe in the Presence of Strain,"In this paper, spintronic properties of the mono-layer GaTe under biaxial and
+uniaxial strain is investigated. Here, spin properties of two structures of
+GaTe, one with mirror symmetry and the other with inversion symmetry, is
+studied. We have also calculated the band structure of GaTe with and without
+spin-orbit coupling to find out the importance of spinorbit interaction (SOI)
+on its band structure. We find band gap can be modified by applying spin-orbit
+coupling in the presence of strain. We explore Mexican-hat dispersion for
+different structures and different strain. We find Mexican-hat can be tuned
+however some cases shows any Mexican-hat. We calculate spin-splitting in
+conduction and valence band in the presence of strain where the structure with
+inversion symmetry doesn't show any splitting. We find in some cases, GaTe
+indicates Rashba dispersion that can be adjusted by strain. The amount of
+Rashba parameters may be in the order of other reported two-dimensional
+materials.",1812.04820v3
+2019-02-02,Effects of strong magnetic fields on neutron $^{3}P_{2}$ superfluidity with spin-orbit interactions,"We discuss neutron $^{3}P_{2}$ phases in the core of neutron stars in strong
+magnetic field (magnetars). The neutron $^{3}P_{2}$ pairing provides a wide
+variety of condensates, such as the uniaxial nematic and (D$_{2}$ and D$_{4}$)
+biaxial nematic, with different symmetries stemming from the combinations of
+spin and momentum. Based on the spin-orbital angular momentum coupling and the
+spin-magnetic field coupling of the neutrons, we derive the Ginzburg-Landau
+equation containing higher order terms of the magnetic field. We investigate
+the phase diagram of the neutron $^{3}P_{2}$ superfluidity, and find that the
+D$_{2}$ biaxial nematic phase is extended by the higher order terms of the
+magnetic field. We also discuss the thermodynamic properties, the heat capacity
+and the spin susceptibility.",1902.00674v2
+2019-02-25,Influences of spin-orbit coupling on Fermi surfaces and Dirac cones in ferroelectric-like polar metals,"Based on first-principles calculations and k .p effective models, we report
+physical properties of ferroelectric-like hexagonal polar metals with P63mc
+symmetry, which are distinct from those of conventional metals with spatial
+inversion symmetry. Spin textures exist on the Fermi surface of polar metals
+(e.g. ternary LiGaGe and elemental polar metal of Bi) and spin-momentum locking
+exist on accidental Dirac cones on the sixfold rotational axis, due to the
+spin-orbit coupling and lack of inversion symmetry in polar space group. This
+effect has potential applications in spin-orbitronics. Dirac points are also
+predicted in LiGaGe.",1902.09052v1
+2019-03-14,Quasiparticle Interference and Symmetry of Superconducting Order Parameter in Strongly Electron-Doped Iron-based Superconductors,"Motivated by recent experimental reports of significant spin-orbit coupling
+(SOC) and a sign-changing order-parameter in the
+Li$_{1-x}$Fe$_x$(OHFe)$_{1-y}$Zn$_y$Se superconductor with only electron
+pockets present, we study the possible Cooper-pairing symmetries and their
+quasiparticle interference (QPI) signatures. We find that each of the resulting
+states - $s$-wave, $d$-wave and helical $p$-wave - can have a fully gapped
+density of states (DOS) consistent with angle-resolved photoemission
+spectroscopy (ARPES) experiments and, due to spin-orbit coupling, are a mixture
+of spin singlet and triplet components leading to intra- and inter-band
+features in the QPI signal. Analyzing predicted QPI patterns we find that only
+the spin-triplet dominated even parity $A_{1g}$ (s-wave) and $B_{2g}$ (d-wave)
+pairing states are consistent with the experimental data. Additionally, we show
+that these states can indeed be realized in a microscopic model with
+atomic-like interactions and study their possible signatures in spin-resolved
+STM experiments.",1903.05935v3
+2019-12-29,Emergent chiral spin ordering and anomalous Hall effect of kagome lattice at 1/3 filling,"The study of electronic and magnetic properties of kagome lattice has been an
+active research area searching for topological phases of matters. In
+particular, the kagome system with transition metal stannides and etc exhibit
+interesting anomalous Hall effects driven by ferromagnetic or non-collinear
+magnetic ordering. In this paper, motivated by these pioneer works, we study
+strongly correlated spin-orbit coupled electrons in kagome lattice at 1/3
+filling. Using both Hartree-Fock approach and effective model analysis, we
+report quantum phase transitions accompanied with distinct charge and magnetic
+ordered phases. Especially, for strongly interacting limit, we discover new
+types of 1(2)-pinned metallic states which are understood by effective
+localized electron models. Furthermore, when spin-orbit coupling is present, it
+turns out that such pinned metallic states open a wide region of Chern
+insulating phase with chiral spin ordering. Thus, quantum anomalous Hall effect
+is expected with emergent scalar spin chirality. Our theory provides a
+theoretical platform of strongly interacting kagome metal which is applicable
+to transition metal stannides.",1912.12621v1
+2019-12-31,Spin-polarized electron transmission in DNA-like systems,"The helical distribution of the electronic density in chiral molecules, such
+as DNA and bacteriorhodopsin, has been suggested to induce a spin-orbit
+coupling interaction that may lead to the so-called chirality-induced spin
+selectivity (CISS) effect. Key ingredients for the theoretical modelling are,
+in this context, the helically shaped potential of the molecule and,
+concomitantly, a Rashba-like spin-orbit coupling due to the appearance of a
+magnetic field in the electron reference frame. Symmetries of these models
+clearly play a crucial role in explaining the observed effect, but a thorough
+analysis has been largely ignored in the literature. In this work, we present a
+study of these symmetries and how they can be exploited to enhance
+chiral-induced spin selectivity in helical molecular systems.",1912.13271v1
+2020-11-18,Hole spin qubits in Si FinFETs with fully tunable spin-orbit coupling and sweet spots for charge noise,"The strong spin-orbit coupling in hole spin qubits enables fast and
+electrically tunable gates, but at the same time enhances the susceptibility of
+the qubit to charge noise. Suppressing this noise is a significant challenge in
+semiconductor quantum computing. Here, we show theoretically that hole Si
+FinFETs are not only very compatible with modern CMOS technology, but they
+present operational sweet spots where the charge noise is completely removed.
+The presence of these sweet spots is a result of the interplay between the
+anisotropy of the material and the triangular shape of the FinFET
+cross-section, and it does not require an extreme fine-tuning of the
+electrostatics of the device. We present how the sweet spots appear in FinFETs
+grown along different crystallographic axes and we study in detail how the
+behaviour of these devices change when the cross-section area and aspect ratio
+are varied. We identify designs that maximize the qubit performance and could
+pave the way towards a scalable spin-based quantum computer.",2011.09417v2
+2016-03-31,Rashba scattering in the low-energy limit,"We study potential scattering in a two-dimensional electron gas with Rashba
+spin-orbit coupling in the limit that the energy of the scattering electron
+approaches the bottom of the lower spin-split band. Focusing on two
+spin-independent circularly symmetric potentials, an infinite barrier and a
+delta-function shell, we show that scattering in this limit is qualitatively
+different from both scattering in the higher spin-split band and scattering of
+electrons without spin-orbit coupling. The scattering matrix is purely
+off-diagonal with both off-diagonal elements equal to one, and all angular
+momentum channels contribute equally; the differential cross section becomes
+increasingly peaked in the forward and backward scattering directions; the
+total cross section exhibits quantized plateaus. These features are independent
+of the details of the scattering potentials, and we conjecture them to be
+universal. Our results suggest that Rashba scattering in the low-energy limit
+becomes effectively one-dimensional.",1603.09456v3
+2016-10-14,Magnetic Field Evolution of Spin Blockade in Ge/Si Nanowire Double Quantum Dots,"We perform transport measurements on double quantum dots defined in Ge/Si
+core/shell nanowires and focus on Pauli spin blockade in the regime where tens
+of holes occupy each dot. We identify spin blockade through the magnetic field
+dependence of leakage current. We find both a dip and a peak in the leakage
+current at zero field. We analyze this behavior in terms of the quantum dot
+parameters such as coupling to the leads, interdot tunnel coupling as well as
+spin-orbit interaction. We find a lower bound for spin-orbit interaction with
+$l_{\rm so}=500$ nm. We also extract large and anisotropic effective Land$\rm
+\acute{e}$ g-factors, with larger g-factors in the direction perpendicular to
+the nanowire axis in agreement with previous studies and experiments but with
+larger values reported here.",1610.04596v1
+2016-10-17,Spin-orbit coupling in quasi-one-dimensional Wigner crystals,"We study the effect of Rashba spin-orbit coupling (SOC) on the charge and
+spin degrees of freedom of a quasi-one-dimensional (quasi-1D) Wigner crystal.
+As electrons in a quasi-1D Wigner crystal can move in the transverse direction,
+SOC cannot be gauged away in contrast to the pure 1D case. We show that for
+weak SOC, a partial gap in the spectrum opens at certain ratios between density
+of electrons and the inverse Rashba length. We present how the low-energy
+branch of charge degrees of freedom deviates due to SOC from its usual linear
+dependence at small wave vectors. In the case of strong SOC, we show that spin
+sector of a Wigner crystal cannot be described by an isotropic
+antiferromagnetic Heisenberg Hamiltonian any more, and that instead the ground
+state of neighboring electrons is mostly a triplet state. We present a new spin
+sector Hamiltonian and discuss the spectrum of Wigner crystal in this limit.",1610.05241v2
+2018-10-24,Nearly isotropic spin-pumping related Gilbert damping in Pt/Ni$_{81}$Fe$_{19}$/Pt,"A recent theory by Chen and Zhang [Phys. Rev. Lett. 114, 126602 (2015)]
+predicts strongly anisotropic damping due to interfacial spin-orbit coupling in
+ultrathin magnetic films. Interfacial Gilbert-type relaxation, due to the spin
+pumping effect, is predicted to be significantly larger for magnetization
+oriented parallel to compared with perpendicular to the film plane. Here, we
+have measured the anisotropy in the Pt/Ni$_{81}$Fe$_{19}$/Pt system via
+variable-frequency, swept-field ferromagnetic resonance (FMR). We find a very
+small anisotropy of enhanced Gilbert damping with sign opposite to the
+prediction from the Rashba effect at the FM/Pt interface. The results are
+contrary to the predicted anisotropy and suggest that a mechanism separate from
+Rashba spin-orbit coupling causes the rapid onset of spin-current absorption in
+Pt.",1810.10595v4
+2020-09-21,Impurity induced magnetic ordering in Sr$_2$RuO$_4$,"Ti substituting Ru in Sr$_2$RuO$_4$ in small concentrations induces
+incommensurate spin density wave order with a wave vector $\boldsymbol{Q}
+\simeq (2 \pi /3, 2 \pi /3)$ corresponding to the nesting vector of two out of
+three Fermi surface sheets. We consider a microscopic model for these two bands
+and analyze the correlation effects leading to magnetic order through
+non-magnetic Ti-doping. For this purpose we use a position dependent mean field
+approximation for the microscopic model and a phenomenological Ginzburg-Landau
+approach, which both deliver consistent results and allow us to examine the
+inhomogeneous magnetic order. Spin-orbit coupling additionally leads to spin
+currents around each impurity, which in combination with the magnetic
+polarization produce a charge current pattern. This is also discussed within a
+gauge field theory in both charge and spin channel. This spin-orbit coupling
+effect causes an interesting modification of the magnetic structure, if
+currents run through the system. Our findings allow a more detailed analysis of
+the experimental data for Sr$_{2}$Ru$_{1-x}$Ti$_{x}$O$_{4}$. In particular, we
+find that the available measurements are consistent with our theoretical
+predictions.",2009.10086v2
+2020-09-24,Stückelberg interferometry using spin-orbit-coupled cold atoms in an optical lattice,"Time evolution of spin-orbit-coupled cold atoms in an optical lattice is
+studied, with a two-band energy spectrum having two avoided crossings. A force
+is applied such that the atoms experience two consecutive Landau-Zener
+tunnelings while transversing the avoided crossings. St\""uckelberg interference
+arises from the phase accumulated during the adiabatic evolution between the
+two tunnelings. This phase is gauge field-dependent and thus provides new
+opportunities to measure the synthetic gauge field, which is verified via
+calculation of spin transition probabilities after a double passage process.
+Time-dependent and time-averaged spin probabilities are derived, in which
+resonances are found. We also demonstrate chiral Bloch oscillation and rich
+spin-momentum locking behavior in this system.",2009.11438v1
+2021-03-04,Intrinsic and extrinsic tunability of Rashba spin-orbit coupled emergent inductors,"The emergent induction of spiral magnets that was proposed [Jpn. J. Appl.
+Phys. 58, 120909 (2019)] and recently demonstrated [Nature 586, 232 (2020)] is
+shown to be further extended by a comprehensive treatment of the Rashba
+spin-orbit coupling and the electron spin relaxation that affect the underlying
+processes of spin-transfer torque and spinmotive force. Within adiabatic
+approximation, we show that the output voltages are widely altered
+intrinsically via the Rashba effect whereas extrinsically via the nonadiabatic
+correction due to the spin relaxation and sample disorder. The findings
+respectively clarify the origins for the amplitude modulation and sign change
+of the emergent inductance with tunability by electrical gating and careful
+sample preparation.",2103.02859v1
+2021-09-02,Terahertz Nonlinear Optics in Two-dimensional Semi-Hydrogenated SiB,"Phase transition and current of planar clusters with loops of Josephson $\pi$
+junction is of great importance for application in the adiabatic quantum
+computation devices (AQC). Each $\pi$-ring possesses an orbital moment with a
+current. The orientation of these orbital moments is altered by
+self-interactions and controlled with a bias current. In the current research,
+we construct the phase diagram of semi-hydrogenated SiB (H-SiB) semiconductor
+using a two-dimensional (2D) Ising model with considering nearest-neighbor and
+diagonal interactions of spin planes on the on the hexagonal lattice. Our
+findings reveal that by decreasing temperature, two phase transitions of order
+and disorder occur and at low temperatures a glassy state appears, where this
+model maps to spin qubit. We theoretically study the magnetostriction effect by
+considering of laser electromagnetic field coupled to the spin planes of
+electric polarization of magnetic insulator for both unstrained and strained
+H-SiB monolayers. The dynamic of laser-spin coupling and spin current shows
+nonlinear optical effects and high-harmonic generation (HHG) under both
+terahertz (THz) and gigahertz (GHz) electromagnetic waves. The findings of this
+research open an avenue for experimentalists how to detect HHG in the
+topological insulators, Dirac systems, Mott insulators, and superconducting
+memories.",2109.00858v1
+2021-09-29,Graphene bilayer and trilayer Moiré lattice with Rashba spin-orbit coupling,"We consider twisted bilayer and trilayer graphene in the presence of Rashba
+spin-orbit coupling and explore the physics of Moir\'e spintronics. The
+electronic charge density has a sharp step right at the magic angles
+$\theta_m$. As a result, local spin observables (polarization and equilibrium
+spin currents) have sharp peaks (of width about a small fraction of 1$^\circ$)
+as a function of the twist angle $\theta$, and abrupt sign reversals at
+$\theta_m$. Thereby, the magic angle can be determined in an unprecedented
+accuracy. In the first chiral limit, the spin currents vanish, but the peculiar
+pattern of the polarization at $\theta_m$ persists. Major differences result in
+spintronics of twisted bilayer graphene at magic angles as compared with the
+spintronics of single and/or {\it un-twisted} bilayer graphene. Thus, in
+addition to the numerous spectacular physical phenomena already reported in
+twisted bilayer graphene at magic angles, new phenomena also occur in
+twistronic spintronics.",2109.14308v3
+2022-10-21,Spin-Dependent High-Order Topological Insulator and Two Types of Distinct Corner Modes in Monolayer FeSe/GdClO Heterostructure,"We propose that a spin-dependent second-order topological insulator can be
+realized in monolayer FeSe/GdClO heterostructure, in which substrate GdClO
+helps to stabilize and enhance the antiferromagnetic order in FeSe. The
+second-order topological insulator is free from spin-orbit coupling and
+in-plane magnetic field. We also find that there exist two types of distinct
+corner modes residing in intersections of two ferromagnetic edges and two
+antiferromagnetic edges, respectively. The underlying physics for ferromagnetic
+corner mode follows a sublattice-chirality-kink picture. More interestingly,
+ferromagnetic corner mode shows spin-dependent property, which is also robust
+against spin-orbit coupling. Unexpectedly, antiferromagnetic corner mode can be
+taken as a typical emergent and hierarchical phenomenon from an array of
+ferromagnetic corner modes. Remarkably, antiferromagnetic corner modes violate
+general kink picture and can be understood as bound states of a one-dimensional
+Schrodinger equation under a connected potential well. Our findings not only
+provide a promising second-order topological insulator in electronic materials,
+but uncover some new properties of corner modes in high-order topological
+insulator.",2210.11813v1
+2022-12-13,Spin-orbit amplitudes for decays with arbitrary spin,"In this paper, we propose a method to construct the decay amplitudes in the
+orbital ($L$) and spin ($S$) coupling scheme for particles with arbitrary
+spins. For the $1\to 2$ decay with only massive particles involved, the angular
+dependence is completely encoded in the angular momentum part, and the spins of
+daughter particles are coupled in the rest frame of the mother particle, which
+contributes only a constant factor. For the sequential decay, the total
+amplitude is constructed by the two $1\to2$ amplitudes evaluated in the rest
+frame of their own mother particles, and then they are transformed to the
+common frame, usually chosen as the laboratory frame, by certain Lorentz
+transformations. In this way, it is easy to add the amplitudes of possible
+different decay chains coherently. If massless particles show up in the final
+states, the polarizations are expressed in helicity basis and the amplitudes
+are modified correspondingly.",2212.06417v2
+2023-01-02,Spin Hall and Edelstein Effects in pseudospin-1 systems: significant contribution of vertex corrections,"Edelstein and spin Hall effect response functions for a two-dimensional (2D)
+system of pseudospin-1 particles is investigated. These two response functions
+denoted by $ \sigma_{SH} $ and $ \sigma_{EE} $ have been analyzed in a
+pseudospin-1 particle system in the presence of the Rashba-type spin-orbit
+interaction using the Kubo-Streda technique and vertex corrections with
+non-magnetic impurities. Then, for a given range of the Rashba coupling,
+response functions of the spin Hall effect (SHE) and Edelstein effect (EE) have
+been estimated at various energy gaps and Fermi energies. Results indicate that
+in this type of the two-dimensional materials, SHE and EE are essentially
+induced by the vertex corrections and without considering these corrections the
+amount of these effects are really negligible. It has also been realized that
+SHE and EE conductivities can be modulated by the Rashba coupling strength at
+low and intermediate level of this spin-orbit type interaction.",2301.00550v1
+2023-08-08,Landau Theory of Altermagnetism,"We formulate a Landau theory for altermagnets, a class of colinear
+compensated magnets with spin-split bands. Starting from the non-relativistic
+limit, this Landau theory goes beyond a conventional analysis by including
+spin-space symmetries, providing a simple framework for understanding the key
+features of this family of materials. We find a set of multipolar secondary
+order parameters connecting existing ideas about the spin symmetries of these
+systems, their order parameters and the effect of non-zero spin-orbit coupling.
+We account for several features of canonical altermagnets such as RuO$_2$, MnTe
+and CuF$_2$ that go beyond symmetry alone, relating the order parameter to key
+observables such as magnetization, anomalous Hall conductivity and
+magneto-elastic and magneto-optical probes. Finally, we comment on
+generalizations of our framework to a wider family of exotic magnetic systems
+deriving from the zero spin-orbit coupled limit.",2308.04484v1
+2023-11-02,Weak localization at arbitrary disorder in systems with generic spin-dependent fields,"We present a theory of weak localization (WL) in the presence of generic
+spin-dependent fields, including any type of spin-orbit coupling, Zeeman
+fields, and non-homogeneous magnetic textures. We go beyond the usual diffusive
+approximation, considering systems with arbitrary disorder, and obtain a
+compact expression for the weak localization (WL) correction to the
+conductivity in terms of the singlet-triplet polarization operator in momentum
+space. The latter can be directly related to the solution of the quasiclassical
+Eilenberger equation for superconducting systems. This formulation presents an
+intuitive framework to explore how the interplay of various spin-dependent
+fields drives weak (anti) localization. We apply our results to study in-plane
+magnetoconductivity in systems with spin-orbit coupling, and in newly
+discovered altermagnets. Our results enable straightforward calculation of the
+WL conductivity at arbitrary disorder, which can be particularly useful for
+interpreting experiments on high-mobility samples.",2311.01148v1
+2023-11-08,Time evolution of coherent wave propagation and spin relaxation in spin-orbit coupled systems,"We investigate, both numerically and analytically, the time evolution of a
+particle in an initial plane wave state as it is subject to elastic scattering
+in a two-dimensional disordered system with Rashba spin-orbit coupling (SOC).
+In the analytic calculation, we treat the SOC non-perturbatively, and the
+disorder perturbatively using the Diffuson and the Cooperon. We calculate the
+time dependence of coherent backscattering (CBS) as a function of the strength
+of the SOC. We identify weak and strong SOC regimes, and give the relevant time
+and energy scales in each case. By studying the time dependence of the
+anisotropy of the disorder-averaged momentum distribution we identify the spin
+relaxation time. We find a crossover from D'yakonov-Perel' spin relaxation for
+weak SOC to Elliot-Yafet like behaviour for strong SOC.",2311.04613v2
+2011-06-20,Spin-orbit coupling in $d^{2}$ ordered double perovskites,"We construct and analyze a microscopic model for insulating rock salt ordered
+double perovskites, with the chemical formula A$_2$BB'O$_6$, where the magnetic
+ion B' has a 4d$^2$ or 5d$^2$ electronic configuration and forms a face
+centered cubic (fcc) lattice. For these B' ions, the combination of the
+triply-degenerate antisymmetric two-electron orbital states and strong
+spin-orbit coupling forms local quintuplets with an effective spin moment
+$j=2$. Moreover, due to strongly orbital-dependent exchange, the effective
+spins have substantial biquadratic and bicubic interactions (fourth and sixth
+order in the spins, respectively). This leads, at the mean field level, to a
+rich ground state phase diagram which includes seven different phases: a
+uniform ferromagnetic phase with an ordering wavevector ${\bf p} = {\bf 0}$ and
+uniform magnetization along $[111]$ direction, four two-sublattice phases with
+an ordering wavevector ${\bf p} = 2\pi(001)$ and two four-sublattice
+antiferromagnetic phases. Amongst the two-sublattice phases there is a
+quadrupolar ordered phase which preserves time reversal symmetry. Extending the
+mean field theory to finite temperatures, we find ten different magnetization
+processes with different magnetic thermal transitions. In particular, we find
+that thermal fluctuations stabilize the two-sublattice quadrupolar ordered
+phase in a large portion of phase diagram. Existing and possible future
+experiments are discussed in light of these theoretical predictions.",1106.3993v1
+2011-11-12,Half-metallic Ferrimagnetism Driven by Coulomb Enhanced Spin-Orbit Coupling in PdCrO3,"Recently, in the seemingly narrow gap insulating NiCrO$_3$ with the
+trigonally distorted (R-3c) perovskite-like structure, a compensated half-metal
+(CHM) is predicted, as applying a modest pressure. Using ab initio calculations
+including both Coulomb correlations and spin-orbit coupling (SOC), we
+investigate the as-yet-unsynthesized PdCrO$_3$, isostructural and isovalent to
+NiCrO$_3$. Upon applying the on-site Coulomb repulsion $U$ to both Pd and Cr
+ions, the Cr spin moment is precisely compensated with the antialigned spin
+moments of Pd and oxygens. Coincidentally only one spin channel remains
+metallic due to the twice larger width of the Pd 4d bands than the Ni 3d bands
+in NiCrO$_3$, indicating CHM in ambient pressure. Inclusion of SOC as well as
+correlation effects (LDA+U+SOC) produces a SOC constant enhanced twice over the
+value of LDA+SOC, leading to unusually large orbital moment of --0.25 $\mu_B$
+on Pd. However, the half-metallicity still survives, so that a transition of
+CHM to a half-metallic ferrimagnet occurs due to Coulomb enhanced SOC. On the
+other hand, an isovalent, but presumed cubic double perovskite La$_2$PdCrO$_6$
+is expected to be a half-metal ferromagnet with tiny orbital moments.",1111.2911v1
+2016-03-01,Generic model for hyperkagome iridate in the local moment regime,"Hyperkagome iridate, Na$_4$Ir$_3$O$_8$, has been regarded as a promising
+candidate material for a three-dimensional quantum spin liquid. Here the
+three-dimensional network of corner-sharing triangles forms the hyperkagome
+lattice of Ir$^{4+}$ ions. Due to strong spin-orbit coupling, the local moments
+of Ir$^{4+}$ ions are described by the pseudospin $j_{\rm eff} = 1/2$ Kramers
+doublet. The Heisenberg model on this lattice is highly frustrated and
+quantum/classical versions have been studied in earlier literature. In this
+work, we derive a generic local-moment model beyond the Heisenberg limit for
+the hyperkagome iridate by considering multi-orbital interactions for all the
+$t_{2g}$ orbitals and spin-orbit coupling. The lifting of massive classical
+degeneracy in the Heisenberg model by various spin-anisotropy terms is
+investigated at the classical level and the resulting phase diagram is
+presented. We find that different anisotropy terms prefer distinct classes of
+magnetically ordered phases, often with various discrete degeneracy. The
+implications of our results for recent $\mu$SR and NMR experiments on this
+material and possible quantum spin liquid phases are discussed.",1603.00469v3
+2022-04-15,First demonstration of tuning between the Kitaev and Ising limits in a honeycomb lattice,"Recent observations of novel spin-orbit coupled states have generated
+tremendous interest in $4d/5d$ transition metal systems. A prime example is the
+$J_{\text{eff}}=\frac{1}{2}$ state in iridate materials and $\alpha$-RuCl$_{3}$
+that drives Kitaev interactions. Here, by tuning the competition between
+spin-orbit interaction ($\lambda_{\text{SOC}}$) and trigonal crystal field
+splitting ($\Delta_\text{T}$), we restructure the spin-orbital wave functions
+into a novel $\mu=\frac{1}{2}$ state that drives Ising interactions. This is
+done via a topochemical reaction that converts Li$_{2}$RhO$_{3}$ to
+Ag$_{3}$LiRh$_{2}$O$_{6}$, leading to an enhanced trigonal distortion and a
+diminished spin-orbit coupling in the latter compound. Using perturbation
+theory, we present an explicit expression for the new $\mu=\frac{1}{2}$ state
+in the limit $\Delta_\text{T}\gg \lambda_{\text{SOC}}$ realized in
+Ag$_{3}$LiRh$_{2}$O$_{6}$, different from the conventional
+$J_\text{eff}=\frac{1}{2}$ state in the limit $\lambda_{\text{SOC}}\gg
+\Delta_\text{T}$ realized in Li$_{2}$RhO$_{3}$. The change of ground state is
+followed by a dramatic change of magnetism from a 6 K spin-glass in
+Li$_{2}$RhO$_{3}$ to a 94 K antiferromagnet in Ag$_{3}$LiRh$_{2}$O$_{6}$. These
+results open a pathway for tuning materials between the two limits and creating
+a rich magnetic phase diagram.",2204.07591v1
+2023-12-15,Geometry of the dephasing sweet spots of spin-orbit qubits,"The dephasing time of spin-orbit qubits is limited by the coupling with
+electrical and charge noise. However, there may exist ""dephasing sweet spots""
+where the qubit decouples (to first order) from the noise so that the dephasing
+time reaches a maximum. Here we discuss the nature of the dephasing sweet spots
+of a spin-orbit qubit electrically coupled to some fluctuator. We characterize
+the Zeeman energy $E_\mathrm{Z}$ of this qubit by the tensor $G$ such that
+$E_\mathrm{Z}=\mu_B\sqrt{\vec{B}^\mathrm{T}G\vec{B}}$ (with $\mu_B$ the Bohr
+magneton and $\vec{B}$ the magnetic field), and its response to the fluctuator
+by the derivative $G^\prime$ of $G$ with respect to the fluctuating field. The
+geometrical nature of the sweet spots on the unit sphere describing the
+magnetic field orientation depends on the sign of the eigenvalues of
+$G^\prime$. We show that sweet spots usually draw lines on this sphere. We then
+discuss how to characterize the electrical susceptibility of a spin-orbit qubit
+with test modulations on the gates. We apply these considerations to a Ge/GeSi
+spin qubit heterostructure, and discuss the prospects for the engineering of
+sweet spots.",2312.09840v2
+2020-11-13,"Eigenspectrum, Chern Numbers and Phase Diagrams of Ultracold Color-orbit Coupled SU(3) Fermions in Optical Lattices","We study ultracold color fermions with three internal states Red, Green and
+Blue with ${\rm SU(3)}$ symmetry in optical lattices, when color-orbit coupling
+and color-flip fields are present. This system corresponds to a generalization
+of two-internal state fermions with ${\rm SU(2)}$ symmetry in the presence of
+spin-orbit coupling and spin-flipping Zeeman fields. We investigate the
+eigenspectrum and Chern numbers to describe different topological phases that
+emerge in the phase diagrams of color-orbit coupled fermions in optical
+lattices. We obtain the phases as a function of artificial magnetic,
+color-orbit and color-flip fields that can be independently controlled. For
+fixed artificial magnetic flux ratio, we identify topological quantum phases
+and phase transitions in the phase diagrams of chemical potential versus
+color-flip fields or color-orbit coupling, where the chirality and number of
+midgap edge states changes. The topologically non-trivial phases are classified
+in three groups: the first group has total non-zero chirality and exhibit only
+the quantum charge Hall effect; the second group has total non-zero chirality
+and exhibit both quantum charge and quantum color Hall effects; and the third
+group has total zero chirality, but exhibit the quantum color Hall effect.
+These phases are generalizations of the quantum Hall and quantum spin Hall
+phases for charged spin-$1/2$ fermions. Lastly, we also describe the color
+density of states and a staircase structure in the total and color filling
+factors versus chemical potential for fixed color-orbit, color-flip and
+magnetic flux ratio. We show the existence of incompressible states at rational
+filling factors precisely given by a gap-labelling theorem that relates the
+filling factors to the magnetic flux ratio and topological quantum numbers.",2011.07139v1
+2021-04-13,Collective P-Wave Orbital Dynamics of Ultracold Fermions,"We consider the non-equilibrium orbital dynamics of spin-polarized ultracold
+fermions in the first excited band of an optical lattice. A specific lattice
+depth and filling configuration is designed to allow the $p_x$ and $p_y$
+excited orbital degrees of freedom to act as a pseudo-spin. Starting from the
+full Hamiltonian for p-wave interactions in a periodic potential, we derive an
+extended Hubbard-type model that describes the anisotropic lattice dynamics of
+the excited orbitals at low energy. We then show how dispersion engineering can
+provide a viable route to realizing collective behavior driven by p-wave
+interactions. In particular, Bragg dressing and lattice depth can reduce
+single-particle dispersion rates, such that a collective many-body gap is
+opened with only moderate Feshbach enhancement of p-wave interactions. Physical
+insight into the emergent gap-protected collective dynamics is gained by
+projecting the Hamiltonian into the Dicke manifold, yielding a one-axis
+twisting model for the orbital pseudo-spin that can be probed using
+conventional Ramsey-style interferometry. Experimentally realistic protocols to
+prepare and measure the many-body dynamics are discussed, including the effects
+of band relaxation, particle loss, spin-orbit coupling, and doping.",2104.06480v3
+2018-12-07,Effects of paramagnetic pair-breaking and spin-orbital coupling on multi-band superconductivity,"The BCS picture of superconductivity describes pairing between electrons
+originating from a single band. A generalization of this picture occurs in
+multi-band superconductors, where electrons from two or more bands contribute
+to superconductivity. The contributions of the different bands can result in an
+overall enhancement of the critical field and can lead to qualitative changes
+in the temperature dependence of the upper critical field when compared to the
+single-band case. While the role of orbital pair-breaking on the critical field
+of multi-band superconductors has been explored extensively, paramagnetic and
+spin-orbital scattering effects have received comparatively little attention.
+Here we investigate this problem using thin films of Nd-doped SrTiO$_3$. We
+furthermore propose a model for analyzing the temperature-dependence of the
+critical field in the presence of orbital, paramagnetic and spin-orbital
+effects, and find a very good agreement with our data. Interestingly, we also
+observe a dramatic enhancement in the out-of-plane critical field to values
+well in excess of the Chandrasekhar-Clogston (Pauli) paramagnetic limit, which
+can be understood as a consequence of multi-band effects in the presence of
+spin-orbital scattering.",1812.02875v2
+2022-11-18,Coupled cluster theory: Towards an algebraic geometry formulation,"Coupled cluster theory produced arguably the most widely used high-accuracy
+computational quantum chemistry methods. Despite the approach's overall great
+computational success, its mathematical understanding is so far limited to
+results within the realm of functional analysis. The coupled cluster
+amplitudes, which are the targeted objects in coupled cluster theory,
+correspond to solutions to the coupled cluster equations, which is a system of
+polynomial equations of at most degree four. The high dimensionality of the
+electronic Schr\""odinger equation and the non-linearity of the coupled cluster
+ansatz have so far stalled a formal analysis of this polynomial system. In this
+article, we present algebraic investigations that shed light on the coupled
+cluster equations and the root structure of this ansatz. This is of importance
+for the a posteriori evaluation of coupled cluster calculations. To that end,
+we investigate the root structure by means of Newton polytopes. We derive a
+general v-description, which is subsequently turned into an h-description for
+explicit examples. This perspective reveals an apparent connection between
+Pauli's exclusion principle and the geometrical structure of the Newton
+polytopes. We also propose an alternative characterization of the coupled
+cluster equations projected onto singles and doubles as cubic polynomials on an
+algebraic variety with certain sparsity patterns. Moreover, we provide
+numerical simulations of two computationally tractable systems, namely, the two
+electrons in four spin-orbitals system and the three electrons in six
+spin-orbitals system. These simulations provide novel insight into the root
+structure of the coupled cluster solutions when the coupled cluster ansatz is
+truncated.",2211.10389v3
+2023-08-17,Orbital Multiferroicity in Pentalayer Rhombohedral Graphene,"Ferroic orders describe spontaneous polarization of spin, charge, and lattice
+degrees of freedom in materials. Materials featuring multiple ferroic orders,
+known as multiferroics, play important roles in multi-functional electrical and
+magnetic device applications. 2D materials with honeycomb lattices offer
+exciting opportunities to engineer unconventional multiferroicity, where the
+ferroic orders are driven purely by the orbital degrees of freedom but not
+electron spin. These include ferro-valleytricity corresponding to the electron
+valley and ferro-orbital-magnetism supported by quantum geometric effects. Such
+orbital multiferroics could offer strong valley-magnetic couplings and large
+responses to external fields-enabling device applications such as
+multiple-state memory elements, and electric control of valley and magnetic
+states. Here we report orbital multiferroicity in pentalayer rhombohedral
+graphene using low temperature magneto-transport measurements. We observed
+anomalous Hall signals Rxy with an exceptionally large Hall angle (tan{\Theta}H
+> 0.6) and orbital magnetic hysteresis at hole doping. There are four such
+states with different valley polarizations and orbital magnetizations, forming
+a valley-magnetic quartet. By sweeping the gate electric field E we observed a
+butterfly-shaped hysteresis of Rxy connecting the quartet. This hysteresis
+indicates a ferro-valleytronic order that couples to the composite field E\cdot
+B, but not the individual fields. Tuning E would switch each ferroic order
+independently, and achieve non-volatile switching of them together. Our
+observations demonstrate a new type of multiferroics and point to electrically
+tunable ultra-low power valleytronic and magnetic devices.",2308.08837v2
+2010-11-30,Topologically non-trivial superconductivity in spin-orbit coupled systems: Bulk phases and quantum phase transitions,"Topologically non-trivial superconductivity has been predicted to occur in
+superconductors with a sizable spin-orbit coupling in the presence of an
+external Zeeman splitting. Two such systems have been proposed: (a) s-wave
+superconductor pair potential is proximity induced on a semiconductor, and (b)
+pair potential naturally arises from an intrinsic s-wave pairing interaction.
+As is now well known, such systems in the form of a 2D film or 1D nano-wires in
+a wire-network can be used for topological quantum computation. When the
+external Zeeman splitting $\Gamma$ crosses a critical value $\Gamma_c$, the
+system passes from a regular superconducting phase to a non-Abelian topological
+superconducting phase. In both cases (a) and (b) we consider in this paper the
+pair potential $\Delta$ is strictly s-wave in both the ordinary and the
+topological superconducting phases, which are separated by a topological
+quantum critical point at $\Gamma_c = \sqrt{\Delta^2 + \mu^2}$, where $\mu (>>
+\Delta)$ is the chemical potential. On the other hand, since $\Gamma_c >>
+\Delta$, the Zeeman splitting required for the topological phase ($\Gamma >
+\Gamma_c$) far exceeds the value ($\Gamma \sim \Delta$) above which an s-wave
+pair potential is expected to vanish (and the system to become
+non-superconducting) in the absence of spin-orbit coupling. We are thus led to
+a situation that the topological superconducting phase appears to set in a
+parameter regime at which the system actually is non-superconducting in the
+absence of spin-orbit coupling. In this paper we address the question of how a
+pure s-wave pair potential can survive a strong Zeeman field to give rise to a
+topological superconducting phase. We show that the spin-orbit coupling is the
+crucial parameter for the quantum transition into and the robustness of the
+topologically non-trivial superconducting phase realized for $\Gamma >>
+\Delta$.",1012.0057v3
+2015-08-11,Quantum phase transitions and Berezinskii-Kosterlitz-Thouless temperature in a two-dimensional spin-orbit-coupled Fermi gas,"We study the effect of spin-orbit coupling on both the zero-temperature and
+non-zero temperature behavior of a two-dimensional (2D) Fermi gas. We include a
+generic combination of Rashba and Dresselhaus terms into the system
+Hamiltonian, which allows us to study both the experimentally relevant
+equal-Rashba-Dresselhaus (ERD) limit and the Rashba-only (RO) limit. At zero
+temperature, we derive the phase diagram as a function of the two-body binding
+energy and Zeeman field. In the ERD case, this phase diagram reveals several
+topologically distinct uniform superfluid phases, classified according to the
+nodal structure of the quasiparticle excitation energies. Furthermore, we use a
+momentum dependent SU(2)-rotation to transform the system into a generalized
+helicity basis, revealing that spin-orbit coupling induces a triplet pairing
+component of the order parameter. At non-zero temperature, we study the
+Berezinskii-Kosterlitz-Thouless (BKT) phase transition by including phase
+fluctuations of the order parameter up to second order. We show that the
+superfluid density becomes anisotropic due to the presence of spin-orbit
+coupling (except in the RO case). This leads both to elliptic vortices and
+antivortices, and to anisotropic sound velocities. The latter prove to be
+sensitive to quantum phase transitions between topologically distinct phases.
+We show further that at a fixed non-zero Zeeman field, the BKT critical
+temperature is increased by the presence of ERD spin-orbit coupling.
+Subsequently, we demonstrate that the Clogston limit becomes infinite:
+$T_{\rm{BKT}}$ remains non-zero at all finite values of the Zeeman field. We
+conclude by extending the quantum phase transition lines to non-zero
+temperature, using the nodal structure of the quasiparticle spectrum, thus
+connecting the BKT critical temperature with the zero-temperature results.",1508.02545v2
+2019-08-01,Spin-Orbit Excitons in CoO,"CoO has an odd number of electrons in its unit cell, and therefore is
+expected to be metallic. Yet, CoO is strongly insulating owing to significant
+electronic correlations, thus classifying it as a Mott insulator. We
+investigate the magnetic fluctuations in CoO using neutron spectroscopy. The
+strong and spatially far-reaching exchange constants reported in [Sarte et al.
+Phys. Rev. B 98 024415 (2018)], combined with the single-ion spin-orbit
+coupling of similar magnitude [Cowley et al. Phys. Rev. B 88, 205117 (2013)]
+results in significant mixing between $j_{eff}$ spin-orbit levels in the low
+temperature magnetically ordered phase. The high degree of entanglement,
+combined with the structural domains originating from the Jahn-Teller
+structural distortion at $\sim$ 300 K, make the magnetic excitation spectrum
+highly structured in both energy and momentum. We extend previous theoretical
+work on PrTl$_{3}$ [Buyers et al. Phys. Rev. B 11, 266 (1975)] to construct a
+mean-field and multi-level spin exciton model employing the aforementioned spin
+exchange and spin-orbit coupling parameters for coupled Co$^{2+}$ ions on a
+rocksalt lattice. This parameterization, based on a tetragonally distorted
+type-II antiferromagnetic unit cell, captures both the sharp low energy
+excitations at the magnetic zone center, and the energy broadened peaks at the
+zone boundary. However, the model fails to describe the momentum dependence of
+the excitations at high energy transfers, where the neutron response decays
+faster with momentum than the Co$^{2+}$ form factor. We discuss such a failure
+in terms of a possible breakdown of localized spin-orbit excitons at high
+energy transfers.",1908.00459v2
+2004-10-07,Resonant spin Hall conductance in quantum Hall systems lacking bulk and structural inversion symmetry,"Following a previous work [Shen, Ma, Xie and Zhang, Phys. Rev. Lett. 92,
+256603 (2004)] on the resonant spin Hall effect, we present detailed
+calculations of the spin Hall conductance in two-dimensional quantum wells in a
+strong perpendicular magnetic field. The Rashba coupling, generated by
+spin-orbit interaction in wells lacking bulk inversion symmetry, introduces a
+degeneracy of Zeeman-split Landau levels at certain magnetic fields. This
+degeneracy, if occuring at the Fermi energy, will induce a resonance in the
+spin Hall conductance below a characteristic temperature of order of the Zeeman
+energy. At very low temperatures, the spin Hall current is highly non-ohmic.
+The Dresselhaus coupling due to the lack of structure inversion symmetry
+partially or completely suppresses the spin Hall resonance. The condition for
+the resonant spin Hall conductance in the presence of both Rashba and
+Dresselhaus couplings is derived using a perturbation method. In the presence
+of disorder, we argue that the resonant spin Hall conductance occurs when the
+two Zeeman split extended states near the Fermi level becomes degenerate due to
+the Rashba coupling and that the the quantized charge Hall conductance changes
+by 2e^2/h instead of e^2/h as the magnetic field changes through the resonant
+field.",0410169v1
+2013-08-13,Coulomb interaction and valley-orbit coupling in Si quantum dots,"The valley-orbit coupling in a few-electron Si quantum dot is expected to be
+a function of its occupation number N. We study the spectrum of multivalley Si
+quantum dots for 2 <= N <= 4, showing that, counterintuitively,
+electron-electron interaction effects on the valley-orbit coupling are
+negligible. For N=2 they are suppressed by valley interference, for N=3 they
+vanish due to spinor overlaps, and for N = 4 they cancel between different
+pairs of electrons. To corroborate our theoretical findings, we examine the
+experimental energy spectrum of a few-electron metal-oxide-semiconductor
+quantum dot. The measured spin-valley state filling sequence in a magnetic
+field reveals that the valley-orbit coupling is definitively unaffected by the
+occupation number.",1308.2728v1
+2016-07-29,Spectroscopic signatures of molecular orbitals on a honeycomb lattice,"A tendency to form benzene-like molecular orbitals has been recently shown to
+be a common feature of the $4d$ and $5d$ transition metal oxides with a
+honeycomb lattice. This tendency competes with other interactions such as the
+spin-orbit coupling and Hubbard correlations, and can be partially or
+completely suppressed. In the calculations, SrRu$_{2}$O$_{6}$ presents the
+cleanest, so far, case of well-formed molecular orbitals, however, direct
+experimental evidence for or against this proposition has been missing. In this
+paper, we show that combined photoemission and optical studies can be used to
+identify molecular orbitals in SrRu$_{2}$O$_{6}$. Symmetry-driven election
+selection rules suppress optical transitions between certain molecular
+orbitals, while photoemission and inverse photoemission measurements are
+insensitive to them. Comparing the photoemission and optical conductivity
+spectra one should be able to observe clear signatures of molecular orbitals.",1607.08847v1
+2023-05-30,Orbital effect on intrinsic superconducting diode effect,"Much ink has recently been spilled on nonreciprocal phenomena in
+superconductors, especially the superconducting diode effect (SDE)
+characterized by the nonreciprocity of the critical current $\Delta J_c$.
+Contrary to the fundamental and practical significance of the SDE, the precise
+underlying mechanism remains unclear. In this paper, we investigate the impact
+of an orbital effect on the intrinsic SDE in a bilayer superconductor with
+Rashba spin-orbit coupling and an in-plane magnetic field. We show that a small
+orbital effect leads to the sign reversal of $\Delta J_c$ and a crossover of
+the helical superconducting state at a lower magnetic field than the monolayer
+superconductor. On the other hand, a large orbital effect induces a decoupling
+transition, stabilizing a finite momentum Cooper pairing state called the
+orbital Fulde-Ferrell-Larkin-Ovchinnikov state, and results in the drastic
+change of the SDE. Owing to the orbital effect, the field dependence of the SDE
+may show oscillations several times. The results shed light on the mechanism of
+the SDE in atomically-thin multilayer superconductors.",2305.19317v1
+2023-11-24,Rashba splitting in polar-nonpolar sandwich heterostructure : A DFT Study,"In this study, we employ density functional theory (DFT) based
+first-principles calculations to investigate the spin-orbit effects in the
+electronic structure of a polar-nonpolar sandwich heterostructure namely
+LAO$_{2.5}$/STO$_{5.5}$/LAO$_{2.5}$. Our focus on the Ti-3d bands reveals an
+inverted ordering of the STO-$\rm t_{2g}$ orbital near the n-type interface,
+consistent with earlier experimental work. In contrast, toward the p-type
+interface, the orbital ordering aligns with the natural ordering of STO
+orbitals, influenced by crystal field splitting. Interestingly, we have found a
+strong inter-orbital coupling between $t_{2g}$ and $e_g$ orbital, which has not
+been reported earlier in $\rm SrTiO_3$ based 2D system. Additionally, our
+observations highlight that the cubic Rashba splitting in this system surpasses
+the linear Rashba splitting, contrary to experimental findings. This
+comprehensive analysis contributes to a refined understanding of the role of
+orbital mixing in Rashba splitting in the sandwich oxide heterostructures.",2311.14787v1
+2016-02-29,Numerical Modeling of Orbit-Spin Coupling Accelerations in a Mars General Circulation Model: Implications for Global Dust Storm Activity,"We employ the MarsWRF general circulation model (GCM) to test the predictions
+of a new physical hypothesis: a weak coupling of the orbital and rotational
+angular momenta of extended bodies is predicted to give rise to cycles of
+intensification and relaxation of circulatory flows within atmospheres. The
+dynamical core of the GCM has been modified to include the orbit-spin coupling
+accelerations due to solar system dynamics for the years 1920-2030. The
+modified GCM is first subjected to extensive testing and validation. We compare
+forced and unforced model outcomes for large-scale zonal and meridional flows,
+and for near-surface wind velocities and surface wind stresses. The predicted
+cycles of circulatory intensification and relaxation within the modified GCM
+are observed. Most remarkably, the modified GCM reproduces conditions favorable
+for the occurrence of perihelion-season global-scale dust storms on Mars in
+years in which such storms were observed. A strengthening of the meridional
+overturning (Hadley) circulation during the dust storm season occurs in the GCM
+in all previously known years with perihelion-season global-scale dust storms.
+The increased upwelling produced in the southern hemisphere in southern summer
+may facilitate the transport of dust to high altitudes in the Mars atmosphere
+during the dust storm season, where radiative heating may further strengthen
+the circulation. Significantly increased surface winds and surface wind
+stresses are also obtained. These may locally facilitate saltation and dust
+lifting from the surface. The numerical simulations constitute proof of concept
+for the orbit-spin coupling hypothesis under evaluation.",1602.09137v1
+2016-10-03,Spin-orbital liquids and insulator-metal transitions on the pyrochlore lattice,"The two orbital Hubbard model, with the electrons additionally coupled to a
+complex magnetic background, arises in the pyrochlore molybdates. The
+background involves local moments Hund's coupled to the electrons, driving
+double exchange ferromagnetism, and antiferromagnetic (AF) tendency arising
+from competing superexchange. The key scales include the Hubbard repulsion and
+the superexchange, both of which can be tuned in these materials. They control
+the phase transition from a ferromagnetic metal to a spin glass metal and then
+to a spin glass (Mott) insulator. We provide a comprehensive description of the
+ground state of this model using an unrestricted Hartree-Fock scheme
+implemented via a simulated annealing procedure and establish the
+metal-insulator transition line for varying Hubbard interaction and
+superexchange. The electrons see an effective disorder, due to orbital
+frustration, already in the ferromagnetic phase. The disorder is further
+enhanced by antiferromagnetic coupling and the resulting magnetic disorder. As
+a result, increasing AF coupling shifts the metal-insulator transition to lower
+Hubbard interaction and gives it an additional ""Anderson"" character. We provide
+detailed results on the magnetic and orbital correlations, the density of
+states, and the optical conductivity.",1610.00695v3
+2020-06-01,Vortex-lattice formation in a spin-orbit coupled rotating spin-1 condensate,"We study the vortex-lattice formation in a rotating {Rashba} spin-orbit (SO)
+coupled quasi-two-dimensional (quasi-2D) hyper-fine spin-1 spinor Bose-Einstein
+condensate (BEC) in the $x-y$ plane using a numerical solution of the
+underlying mean-field Gross-Pitaevskii equation. % The wave function for this
+system %has three components corresponding to the three projections of
+hyper-fine spin $F_z= +1,0,-1$. In this case, the non-rotating {Rashba}
+SO-coupled spinor BEC can have topological excitation in the form of vortices
+of different angular momenta in the three components, e.g. the $(0,+1,+2)$- and
+$(-1,0,+1)$-type states in ferromagnetic and anti-ferromagnetic spinor BEC: the
+numbers in the parenthesis denote the intrinsic angular momentum of the vortex
+states of the three components with the negative sign denoting an anti-vortex.
+The presence of these states with intrinsic vorticity breaks the symmetry
+between rotation with vorticity along the $z$ and $-z$ axes and thus generates
+a rich variety of vortex-lattice and anti-vortex-lattice states in a rotating
+quasi-2D spin-1 spinor ferromagnetic and anti-ferromagnetic BEC, not possible
+in a scalar BEC. {For weak SO coupling, } we find two types of symmetries of
+these states $-$ hexagonal and ""square"". The hexagonal (square) symmetry state
+has vortices arranged in closed concentric orbits with a maximum of $6, 12,
+18...$ ($8,12,16...$) vortices in successive orbits. Of these two symmetries,
+the square vortex-lattice state is found to have the smaller energy.",2006.00646v3
+2023-10-06,Electronic structure of MoS$_2$ revisited: a comprehensive assessment of $G_0W_0$ calculations,"Two-dimensional MoS$_2$ combines many interesting properties that make the
+material a top candidate for a variety of applications. It exhibits a high
+electron mobility comparable to graphene, a direct fundamental band gap,
+relatively strongly bound excitons, and moderate spin-orbit coupling. For a
+thorough understanding of all these properties, an accurate description of the
+electronic structure is mandatory. Surprisingly, published band gaps of MoS$_2$
+obtained with $GW$, the state-of-the-art in electronic-structure calculations,
+are quite scattered, ranging from 2.31 to 2.97 eV. The details of $G_0W_0$
+calculations, such as the underlying geometry, the starting point, the
+inclusion of spin-orbit coupling, and the treatment of the Coulomb potential
+can critically determine how accurate the results are. In this manuscript, we
+employ the linearized augmented planewave + local orbital method to
+systematically investigate how all these aspects affect the quality of $G_0W_0$
+calculations, and also provide a summary of literature data. We conclude that
+the best overall agreement with experiments and coupled-cluster calculations is
+found for $G_0W_0$ results with HSE06 as a starting point including spin-orbit
+coupling, a truncated Coulomb potential, and an analytical treatment of the
+singularity at $q=0$.",2310.04198v1
+2010-05-14,"Electron Confinement, Orbital Ordering, and Orbital Moments in $d^0$-$d^1$ Oxide Heterostructures","The (SrTiO$_3$)$_m$/(SrVO$_3$)$_n$ $d^0-d^1$ multilayer system is studied
+with first principles methods through the observed insulator-to-metal
+transition with increasing thickness of the SrVO$_3$ layer. When correlation
+effects with reasonable magnitude are included, crystal field splittings from
+the structural relaxations together with spin-orbit coupling (SOC) determines
+the behavior of the electronic and magnetic structures. These confined slabs of
+SrVO$_3$ prefer $Q_{orb}$=($\pi,\pi$) orbital ordering of $\ell_z = 0$ and
+$\ell_z = -1$ ($j_z=-1/2$) orbitals within the plane, accompanied by
+$Q_{spin}$=(0,0) spin order (ferromagnetic alignment). The result is a
+SOC-driven ferromagnetic Mott insulator. The orbital moment of 0.75 $\mu_B$
+strongly compensates the spin moment on the $\ell_z = -1$ sublattice. The
+insulator-metal transition for $n = 1 \to 5$ (occurring between $n$=4 and
+$n$=5) is reproduced. Unlike in the isoelectronic $d^0-d^1$ TiO$_2$/VO$_2$
+(rutile structure) system and in spite of some similarities in orbital
+ordering, no semi-Dirac point [{\it Phys. Rev. Lett.} {\bf 102}, 166803 (2009)]
+is encountered, but the insulator-to-metal transition occurs through a
+different type of unusual phase. For n=5 this system is very near (or at) a
+unique semimetallic state in which the Fermi energy is topologically determined
+and the Fermi surface consists of identical electron and hole Fermi circles
+centered at $k$=0. The dispersion consists of what can be regarded as a
+continuum of radially-directed Dirac points, forming a ""Dirac circle"".",1005.2484v1
+2019-08-07,Evolution of topological superconductivity by orbital selective confinement in oxide nanowires,"We determine the optimal conditions to achieve topological superconducting
+phases having spin-singlet pairing for a planar nanowire with finite lateral
+width in the presence of an in-plane external magnetic field. We employ a
+microscopic description that is based on a three-band electronic model
+including both the atomic spin-orbit coupling and the inversion asymmetric
+potential at the interface between oxide band-gap insulators. We consider
+amplitudes of the pairing gap, spin-orbit interactions and electronic
+parameters that are directly applicable to nanowires of LaAlO$_3$-SrTiO$_3$.
+The lateral confinement introduces a splitting of the $d$-orbitals that alters
+the orbital energy hierarchy and significantly affects the electron filling
+dependence of the topological phase diagram. Due to the orbital directionality
+of the $t_{2g}$-states, we find that in the regime of strong confinement the
+onset of topological phases is pinned at electron filling where the quasi flat
+heavy bands start to get populated. The increase of the nanowire thickness
+leads to a changeover from sparse-to-dense distribution of topologically
+non-trivial domains which occurs at the cross-over associated to the orbital
+population inversion. These findings are corroborated by a detailed analysis of
+the most favorable topological superconducting phases in the electron
+doping-magnetic field plane highlighting the role of orbital selective
+confinement.",1908.02857v1
+2003-09-30,Effect of Hund coupling in the one-dimensional SU(4) Hubbard model,"The one-dimensional SU(4) Hubbard model perturbed by Hund coupling is
+studied, away from half-filling, by means of renormalization group and
+bosonization methods. A spectral gap is always present in the spin-orbital
+sector irrespective of the magnitude of the Coulomb repulsion. We further
+distinguish between two qualitatively different regimes. At small Hund
+coupling, we find that the symmetry of the system is dynamically enlarged to
+SU(4) at low energy with the result of {\it coherent} spin-orbital excitations.
+When the charge sector is not gapped, a superconducting instability is shown to
+exist. At large Hund coupling, the symmetry is no longer enlarged to SU(4) and
+the excitations in the spin sector become {\it incoherent}. Furthermore, the
+superconductivity can be suppressed in favor of the conventional charge density
+wave state.",0310003v1
+2013-06-03,Nonrelativistic Limit of the Dirac-Schwarzschild Hamiltonian: Gravitational Zitterbewegung and Gravitational Spin-Orbit Coupling,"We investigate the nonrelativistic limit of the gravitationally coupled Dirac
+Equation via a Foldy-Wouthuysen transformation. The relativistic correction
+terms have immediate and obvious physical interpretations in terms of a
+gravitational zitterbewegung, and a gravitational spin-orbit coupling. We find
+no direct coupling of the spin vector to the gravitational force, which would
+otherwise violate parity. The particle-antiparticle symmetry described recently
+by one of us in [Phys.Rev.A 87 (2013) 032101] is verified on the level of the
+perturbative corrections accessed by the Foldy-Wouthuysen transformation. The
+gravitational corrections to the electromagnetic transition current are
+calculated.",1306.0479v2
+2013-06-24,Density profiles and collective modes of a Bose-Einstein condensate with light-induced spin-orbit coupling,"The phases of a Bose-Einstein condensate (BEC) with light-induced spin-orbit
+coupling (SOC) are studied within the mean-field approximation. The mixed BEC
+phase, in which the system condenses in a superposition of two plane wave
+states, is found to be stable for sufficiently small light-atom coupling,
+becoming unstable in a continuous fashion with increasing light-atom coupling.
+The structure of the phase diagram at fixed chemical potential for bosons with
+SOC is shown to imply an unusual density dependence for a trapped mixed BEC
+phase, with the density of one dressed spin state increasing with increasing
+radius, providing a unique experimental signature of this state. The collective
+Bogoliubov sound mode is shown to also provide a signature of the mixed BEC
+state, vanishing as the boundary to the regime of phase separation is
+approached.",1306.5717v2
+2015-02-02,Carbon-dioxide-like Skyrmion controlled by spin-orbit coupling in atomic-molecular Bose-Einstein condensates,"Atomic-molecular Bose-Einstein condensates (BECs) offer brand new
+opportunities to revolutionize quantum gases and probe the variation of
+fundamental constants with unprecedented sensitivity. The recent realization of
+spin-orbit coupling (SOC) in BECs provides a new platform for exploring
+completely new phenomena unrealizable elsewhere. However, there is no study of
+SOC atomic-molecular BECs so far. Here, we find a novel way of creating a
+Rashba-Dresselhaus SOC in atomic-molecular BECs by combining the spin dependent
+photoassociation and Raman coupling, which can control the formation and
+distribution of a new type of topological excitation -- carbon-dioxide-like
+Skyrmion. This Skyrmion is formed by two half-Skyrmions of molecular BECs
+coupling with one Skyrmion of atomic BECs, where the two half-Skyrmions locates
+at both sides of one Skyrmion, which can be detected by measuring the vortices
+structures using the time-of-flight absorption imaging technique in real
+experiments.",1502.00489v2
+2017-02-15,Fulde-Ferrell-Larkin-Ovchinnikov state to topological superfluidity transition in bilayer spin-orbit coupled degenerate Fermi gas,"Recently a scheme has been proposed for generating the 2D Rashba-type
+spin-orbit coupling (SOC) for ultracold atomic bosons in a bilayer geometry
+[S.-W. Su et al, Phys. Rev. A \textbf{93}, 053630 (2016)]. Here we investigate
+the superfluidity properties of a degenerate Fermi gas affected by the SOC in
+such a bilayer system. We demonstrate that a Fulde-Ferrell-Larkin-Ovchinnikov
+(FFLO) state appears in the regime of small to moderate atom-light coupling. In
+contrast to the ordinary SOC, the FFLO state emerges in the bilayer system
+without adding any external fields or spin polarization. As the atom-light
+coupling increases, the system can transit from the FFLO state to a topological
+superfluid state. These findings are also confirmed by the BdG simulations with
+a weak harmonic trap added.",1702.04735v2
+2018-03-01,Tuning the two-electron hybridization and spin states in parallel-coupled InAs quantum dots,"We study spin transport in the one- and two-electron regimes of
+parallel-coupled double quantum dots (DQDs). The DQDs are formed in InAs
+nanowires by a combination of crystal-phase engineering and electrostatic
+gating, with an interdot tunnel coupling ($t$) tunable by one order of
+magnitude. Large single-particle energy separations (up to 10 meV) and $|g^*|$
+factors ($\sim$10) enable detailed studies of the $B$-field-induced transition
+from a singlet-to-triplet ground state as a function of $t$. In particular, we
+investigate how the magnitude of the spin-orbit-induced singlet-triplet
+anticrossing depends on $t$. For cases of strong coupling, we find values of
+230 $\mu$eV for the anticrossing using excited-state spectroscopy. Experimental
+results are reproduced by calculations based on rate equations and a DQD model
+including a single orbital in each dot.",1803.00326v2
+2019-04-07,Polarity and spin-orbit coupling induced large interfacial exchange coupling an asymmetric charge transfer in iridate-manganite heterostructure,"Charge transfer is of particular importance in manipulating the interface
+physics in transition-metal oxide heterostructures. In this work, we have
+fabricated epitaxial bilayers composed of polar 3d LaMnO3 and nonpolar 5d
+SrIrO3. Systematic magnetic measurements reveal an unexpectedly large exchange
+bias effect in the bilayer, together with a dramatic enhancement of the
+coercivity of LaMnO3. Based on first-principles calculations and x-ray
+absorption spectroscopy measurements, such a strong interfacial magnetic
+coupling is found closely associated with the polar nature of LaMnO3 and the
+strong spin-orbit interaction in SrIrO3, which collectively drives an
+asymmetric interfacial charge transfer and leads to the emergence of an
+interfacial spin glass state. Our study provides new insight into the charge
+transfer in transition-metal oxide heterostructures and offers a novel means to
+tune the interfacial exchange coupling for a variety of device applications.",1904.03613v2
+2022-09-16,The electronic system $(2)^2Σ^+$ and $(1)^2Π$ of LiCa,"High resolution Fourier transform spectroscopy and Laser induced fluorescence
+has been performed on LiCa in the infrared spectral range. We analyze
+rovibrational transitions of the $(2)^2\Sigma^+$--$X(1)^2\Sigma^+$ system of
+LiCa and find the $(2)^2\Sigma^+$ state to be perturbed by spin-orbit coupling
+to the $(1)^2\Pi$ state. We study the coupled system obtaining molecular
+parameters for the $(2)^2\Sigma^+$ and the $(1)^2\Pi$ state together with
+effective spin-orbit and spin-rotation coupling constants. The coupled system
+has also been evaluated by applying a potential function instead of
+rovibrational molecular parameters for the state $(2)^2\Sigma^+$. An improved
+analytic potential function of the $X(1)^2\Sigma^+$ state is derived, due to
+the extension of the observed rotational ladder.",2209.07853v1
+2020-07-30,Electrical and Thermal Generation of Spin Currents by Magnetic Graphene,"The demand for compact, high-speed and energy-saving circuitry urges higher
+efficiency of spintronic devices that can offer a viable alternative for the
+current electronics. The route towards this goal suggests implementing
+two-dimensional (2D) materials that provide large spin polarization of charge
+current together with the long-distance transfer of the spin information. Here,
+for the first time, we experimentally demonstrate a large spin polarization of
+the graphene conductivity ($\approx 14\%$) arising from a strong induced
+exchange interaction in proximity to a 2D layered antiferromagnetic. The strong
+coupling of charge and spin currents in graphene with high efficiency of spin
+current generation, comparable to that of metallic ferromagnets, together with
+the observation of spin-dependent Seebeck and anomalous Hall effects, all
+consistently confirm the magnetic nature of graphene. The high sensitivity of
+spin transport in graphene to the magnetization of the outermost layer of the
+adjacent interlayer antiferromagnet, also provides a tool to read out a single
+magnetic sub-lattice. The first time observations of the electrical and thermal
+generation of spin currents by magnetic graphene suggest it as the ultimate
+building block for ultra-thin magnetic memory and sensory devices, combining
+gate tunable spin-dependent conductivity, long-distance spin transport and
+spin-orbit coupling all in a single 2D material.",2007.15597v1
+2020-12-16,Ab initio Ultrafast Spin Dynamics in Solids,"Spin relaxation and decoherence is at the heart of spintronics and spin-based
+quantum information science. Currently, theoretical approaches that can
+accurately predict spin relaxation of general solids including necessary
+scattering pathways and capable for ns to ms simulation time are urgently
+needed. We present a first-principles real-time density-matrix approach based
+on Lindblad dynamics to simulate ultrafast spin dynamics for general
+solid-state systems. Through the complete first-principles descriptions of
+pump, probe and scattering processes including electron-phonon,
+electron-impurity and electron-electron scatterings with self-consistent
+electronic spin-orbit couplings, our method can directly simulate the ultrafast
+pump-probe measurements for coupled spin and electron dynamics over ns at any
+temperatures and doping levels. We first apply this method to a prototypical
+system GaAs and obtain excellent agreement with experiments. We find that the
+relative contributions of different scattering mechanisms and phonon modes
+differ considerably between spin and carrier relaxation processes. In sharp
+contrast to previous work based on model Hamiltonians, we point out that the
+electron-electron scattering is negligible at room temperature but becomes
+dominant at low temperatures for spin relaxation in n-type GaAs. We further
+examine ultrafast dynamics in novel spin-valleytronic materials - monolayer and
+bilayer WSe2 with realistic defects. We find that spin relaxation is highly
+sensitive to local symmetry and chemical bonds around defects. Our work
+provides a predictive computational platform for spin dynamics in solids, which
+has unprecedented potentials for designing new materials ideal for spintronics
+and quantum information technology.",2012.08711v3
+2021-03-26,Tuning interactions between spins in a superconductor,"Novel many-body and topological electronic phases can be created in
+assemblies of interacting spins coupled to a superconductor, such as
+one-dimensional topological superconductors with Majorana zero modes (MZMs) at
+their ends. Understanding and controlling interactions between spins and the
+emergent band structure of the in-gap Yu-Shiba-Rusinov (YSR) states they induce
+in a superconductor are fundamental for engineering such phases. Here, by
+precisely positioning magnetic adatoms with a scanning tunneling microscope
+(STM), we demonstrate both the tunability of exchange interaction between spins
+and precise control of the hybridization of YSR states they induce on the
+surface of a bismuth (Bi) thin film that is made superconducting with the
+proximity effect. In this platform, depending on the separation of spins, the
+interplay between Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, spin-orbit
+coupling, and surface magnetic anisotropy stabilizes different types of spin
+alignments. Using high-resolution STM spectroscopy at millikelvin temperatures,
+we probe these spin alignments through monitoring the spin-induced YSR states
+and their energy splitting. Such measurements also reveal a quantum phase
+transition between the ground states with different electron number parity for
+a pair of spins in a superconductor tuned by their separation. Experiments on
+larger assemblies show that spin-spin interactions can be mediated in a
+superconductor over long distances. Our results show that controlling
+hybridization of the YSR states in this platform provides the possibility of
+engineering the band structure of such states for creating topological phases.",2103.14656v1
+2008-03-12,Analysis of spin precession in binary black hole systems including quadrupole-monopole interaction,"We analyze in detail the spin precession equations in binary black hole
+systems, when the tidal torque on a Kerr black hole due to quadrupole-monopole
+coupling is taken into account. We show that completing the precession
+equations with this term reveals the existence of a conserved quantity at 2PN
+order when averaging over orbital motion. This quantity allows one to solve the
+(orbit-averaged) precession equations exactly in the case of equal masses and
+arbitrary spins, neglecting radiation reaction. For unequal masses, an exact
+solution does not exist in closed form, but we are still able to derive
+accurate approximate analytic solutions. We also show how to incorporate
+radiation reaction effects into our analytic solutions adiabatically, and
+compare the results to solutions obtained numerically. For various
+configurations of the binary, the relative difference in the accumulated
+orbital phase computed using our analytic solutions versus a full numerical
+solution vary from about 0.3% to 1.8% over the 80 - 140 orbital cycles
+accumulated while sweeping over the orbital frequency range 20 - 300 Hz. This
+typically corresponds to a discrepancy of order 5-6 radians. While this may not
+be accurate enough for implementation in LIGO template banks, we still believe
+that our new solutions are potentially quite useful for comparing numerical
+relativity simulations of spinning binary black hole systems with
+post-Newtonian theory. They can also be used to gain more understanding of
+precession effects, with potential application to the gravitational recoil
+problem, and to provide semi-analytical templates for spinning, precessing
+binaries.",0803.1820v3
+2015-09-03,Nematicity and magnetism in FeSe and other families of Fe-based superconductors,"Nematicity and magnetism are two key features in Fe-based superconductors,
+and their interplay is one of the most important unsolved problems. In FeSe,
+the magnetic order is absent below the structural transition temperature
+$T_{str}=90$K, in stark contrast that the magnetism emerges slightly below
+$T_{str}$ in other families. To understand such amazing material dependence, we
+investigate the spin-fluctuation-mediated orbital order ($n_{xz}\neq n_{yz}$)
+by focusing on the orbital-spin interplay driven by the strong-coupling effect,
+called the vertex correction. This orbital-spin interplay is very strong in
+FeSe because of the small ratio between the Hund's and Coulomb interactions
+($\bar{J}/\bar{U}$) and large $d_{xz},d_{yz}$-orbitals weight at the Fermi
+level. For this reason, in the FeSe model, the orbital order is established
+irrespective that the spin fluctuations are very weak, so the magnetism is
+absent below $T_{str}$. In contrast, in the LaFeAsO model, the magnetic order
+appears just below $T_{str}$ both experimentally and theoretically. Thus, the
+orbital-spin interplay due to the vertex correction is the key ingredient in
+understanding the rich phase diagram with nematicity and magnetism in Fe-based
+superconductors in a unified way.",1509.01161v2
+2016-05-20,Elementary specific spin and orbital moments of ultrathin CoFeB amorphous films on GaAs(100),"Nanoscale CoFeB amorphous films have been synthesized on GaAs(100) and
+studied with X-ray magnetic circular dichroism (XMCD) and transmission electron
+microscopy (TEM). We have found that the ratios of the orbital to spin magnetic
+moments of both the Co and Fe in the ultrathin amorphous film have been
+enhanced by more than 300% compared with those of the bulk crystalline Co and
+Fe, and in specifically, a large orbital moment of 0.56*10^-6 B from the Co
+atoms has been observed and at the same time the spin moment of the Co atoms
+remains comparable to that of the bulk hcp Co. The results indicate that the
+large uniaxial magnetic anisotropy (UMA) observed in the ultrathin CoFeB film
+on GaAs(100) is related to the enhanced spin-orbital coupling of the Co atoms
+in the CoFeB. This work offers experimental evidences of the correlation
+between the UMA and the elementary specific spin and orbital moments in the
+CoFeB amorphous film on the GaAs(100) substrate, which is significant for
+spintronics applications.",1605.06358v1
+2021-02-21,Role of exchange splitting and ligand field splitting in tuning the magnetic anisotropy of an individual iridium atom on TaS2 substrate,"In this work, using first-principle calculation we investigate the magnetic
+anisotropy (MA) of single-atom iridium (Ir) on TaS2 substrate. We find that the
+strength and direction of MA in the Ir adatom can be tuned by strain. The MA
+arises from two sources, namely spin-conservation term and spin-flip term. The
+spin-conservation term is generated by spin-orbit coupling (SOC) interaction on
+dxy/dx2-y2 orbitals and is contributed to the out-of-plane MA. The spin-flip
+term is caused by SOC interaction on dxz/dyz and px/py orbitals and is
+responsible for the in-plane MA. We further find that strain-tuned MA is mainly
+determined by exchange splitting and ligand field splitting. Increase of strain
+will enhance the exchange splitting and reduce the ligand field splitting,
+resulting in the enhancement of the in-plane MA from dxy/dx2-y2 orbitals and
+the reduction of the out-of-plane MA from dxz/dyz and px/py orbitals, and hence
+leading to the change of the strength and direction of the total MA. Our study
+provides a way for tuning the MA of single-atoms magnet on 2D transition metal
+dichalcogenides substrate by control of the exchange splitting and the ligand
+field splitting.",2102.10548v2
+2021-05-10,Observation of the Orbital Rashba-Edelstein Magnetoresistance,"We report the observation of magnetoresistance (MR) originating from the
+orbital angular momentum transport (OAM) in a Permalloy (Py) / oxidized Cu
+(Cu*) heterostructure: the orbital Rashba-Edelstein magnetoresistance. The
+angular dependence of the MR depends on the relative angle between the induced
+OAM and the magnetization in a similar fashion as the spin Hall
+magnetoresistance (SMR). Despite the absence of elements with large spin-orbit
+coupling, we find a sizable MR ratio, which is in contrast to the conventional
+SMR which requires heavy elements. By varying the thickness of the Cu* layer,
+we confirm that the interface is responsible for the MR, suggesting that the
+orbital Rashba-Edelstein effect is responsible for the generation of the OAM.
+Through Py thickness-dependence studies, we find that the effective values for
+the spin diffusion and spin dephasing lengths of Py are significantly larger
+than the values measured in Py / Pt bilayers, approximately by the factor of 2
+and 4, respectively. This implies that another mechanism beyond the
+conventional spin-based scenario is responsible for the MR observed in Py / Cu*
+structures originated in a sizeable transport of OAM. Our findings not only
+unambiguously demonstrate the current-induced torque without using any heavy
+element via the OAM channel but also provide an important clue towards the
+microscopic understanding of the role that OAM transport can play for
+magnetization dynamics.",2105.04495v2
+2023-06-04,Efficient method to calculate energy spectra for analysing magneto-oscillations,"Magneto-oscillations in two-dimensional systems with spin-orbit interaction
+are typically characterized by fast Shubnikov-de~Haas (SdH) oscillations and
+slower spin-orbit-related beatings. The characterization of the full SdH
+oscillatory behavior in systems with both spin-orbit interaction and Zeeman
+coupling requires a time consuming diagonalization of large matrices for many
+magnetic field values. By using the Poisson summation formula we can explicitly
+separate the density of states into, fast and slow oscillations, which
+determine the corresponding fast and slow parts of the magneto-oscillations. We
+introduce an efficient scheme of partial diagonalization of our Hamiltonian,
+where only states close to the Fermi energy are needed to obtain the SdH
+oscillations, thus reducing the required computational time. This allows an
+efficient method for fitting numerically the SdH data, using the inherent
+separation of the fast and slow oscillations. We compare systems with only
+Rashba spin-orbit interaction (SOI) and both Rashba and Dresselhaus SOI with,
+and without, an in-plane magnetic field. The energy spectra are characterized
+in terms of symmetries, which have direct and visible consequences in the
+magneto-oscillations. To highlight the benefits of our methodology, we use it
+to extract the spin-orbit parameters by fitting realistic transport data.",2306.02503v1
+2023-04-10,"Spin-phonon interactions and magnetoelectric coupling in Co$_4$$B_2$O$_9$ ($B$ = Nb, Ta)","In order to explore the consequences of spin-orbit coupling on spin-phonon
+interactions in a set of chemically-similar mixed metal oxides, we measured the
+infrared vibrational properties of Co$_4B_2$O$_9$ ($B$ = Nb, Ta) as a function
+of temperature and compared our findings with lattice dynamics calculations and
+several different models of spin-phonon coupling. Frequency vs. temperature
+trends for the Co$^{2+}$ shearing mode near 150 cm$^{-1}$ reveal significant
+shifts across the magnetic ordering temperature that are especially large in
+relative terms. Bringing these results together and accounting for
+noncollinearity, we obtain spin-phonon coupling constants of -3.4 and -4.3
+cm$^{-1}$ for Co$_4$Nb$_2$O$_9$ and the Ta analog, respectively. Analysis
+reveals that these coupling constants derive from interlayer (rather than
+intralayer) exchange interactions and that the interlayer interactions contain
+competing antiferromagnetic and ferromagnetic contributions. At the same time,
+beyond-Heisenberg terms are minimized due to fortuitous symmetry
+considerations, different than most other 4$d$- and 5$d$-containing oxides.
+Comparison with other contemporary oxides shows that spin-phonon coupling in
+this family of materials is among the strongest ever reported, suggesting an
+origin for magnetoelectric coupling.",2304.04865v1
+2011-03-21,High Chern number quantum anomalous Hall phases in graphene ribbons with Haldane orbital coupling,"We investigate possible phase transitions among the different quantum
+anomalous Hall (QAH) phases in a zigzag graphene ribbon under the influence of
+the exchange field. The effective tight-binding Hamiltonian for graphene is
+made up of the hopping term, the Kane-Mele and Rashba spin-orbit couplings as
+well as the Haldane orbital term. We find that the variation of the exchange
+field results in bulk gap-closing phenomena and phase transitions occur in the
+graphene system. If the Haldane orbital coupling is absent, the phase
+transition between the chiral (anti-chiral) edge state $\nu=+2$ ($\nu=-2$) and
+the pseudo-quantum spin Hall state ($\nu=0$) takes place. Surprisingly, when
+the Haldane orbital coupling is taken into account, an intermediate QSH phase
+with two additional edge modes appears in between phases $\nu=+2$ and $\nu=-2$.
+This intermediate phase is therefore either the hyper-chiral edge state of high
+Chern number $\nu=+4$ or anti-hyper-chiral edge state of $\nu=-4$ when the
+direction of exchange field is reversed. We present the band structures, edge
+state wave functions and current distributions of the different QAH phases in
+the system. We also report the critical exchange field values for the QAH phase
+transitions.",1103.4083v1
+2023-07-27,Interlayer Coupling Driven High-Temperature Superconductivity in La$_3$Ni$_2$O$_7$ Under Pressure,"The newly discovered high-temperature superconductivity in La$_3$Ni$_2$O$_7$
+under pressure has attracted a great deal of attentions. The essential
+ingredient characterizing the electronic properties is the bilayer NiO$_2$
+planes coupled by the interlayer bonding of $3d_{z^2}$ orbitals through the
+intermediate oxygen-atoms. In the strong coupling limit, the low energy physics
+is described by an intralayer antiferromagnetic spin-exchange interaction
+$J_{\parallel}$ between $3d_{x^2-y^2}$ orbitals and an interlayer one
+$J_{\perp}$ between $3d_{z^2}$ orbitals. Taking into account Hund's rule on
+each site and integrating out the $3d_{z^2}$ spin degree of freedom, the system
+reduces to a single-orbital bilayer $t$-$J$ model based on the $3d_{x^2-y^2}$
+orbital. By employing the slave-boson approach, the self-consistent equations
+for the bonding and pairing order parameters are solved. Near the physically
+relevant $\frac{1}{4}$-filling regime (doping $\delta=0.3\sim 0.5$), the
+interlayer coupling $J_{\perp}$ tunes the conventional single-layer $d$-wave
+superconducting state to the $s$-wave one. A strong $J_{\perp}$ could enhance
+the inter-layer superconducting order, leading to a dramatically increased
+$T_c$. Interestingly, there could exist a finite regime in which an $s+id$
+state emerges.",2307.14965v3
+2018-06-17,Interactions and magnetotransport through spin-valley coupled Landau levels in monolayer MoS$_{2}$,"The strong spin-orbit coupling and the broken inversion symmetry in monolayer
+transition metal dichalcogenides (TMDs) results in spin-valley coupled band
+structures. Such a band structure leads to novel applications in the fields of
+electronics and optoelectronics. Density functional theory calculations as well
+as optical experiments have focused on spin-valley coupling in the valence
+band. Here we present magnetotransport experiments on high-quality n-type
+monolayer molybdenum disulphide (MoS$_{2}$) samples, displaying highly resolved
+Shubnikov-de Haas oscillations at magnetic fields as low as $2~T$. We find the
+effective mass $0.7~m_{e}$, about twice as large as theoretically predicted and
+almost independent of magnetic field and carrier density. We further detect the
+occupation of the second spin-orbit split band at an energy of about $15~meV$,
+i.e. about a factor $5$ larger than predicted. In addition, we demonstrate an
+intricate Landau level spectrum arising from a complex interplay between a
+density-dependent Zeeman splitting and spin and valley-split Landau levels.
+These observations, enabled by the high electronic quality of our samples,
+testify to the importance of interaction effects in the conduction band of
+monolayer MoS$_{2}$.",1806.06402v2
+1998-08-03,Coupled quantum dots as quantum gates,"We consider a new quantum gate mechanism based on electron spins in coupled
+semiconductor quantum dots. Such gates provide a general source of spin
+entanglement and can be used for quantum computers. We determine the exchange
+coupling J in the effective Heisenberg model as a function of magnetic (B) and
+electric fields, and of the inter-dot distance (a) within the Heitler-London
+approximation of molecular physics. This result is refined by using
+sp-hybridization, and by the Hund-Mulliken molecular-orbit approach which leads
+to an extended Hubbard description for the two-dot system that shows a
+remarkable dependence on B and a due to the long-range Coulomb interaction. We
+find that the exchange J changes sign at a finite field (leading to a
+pronounced jump in the magnetization) and then decays exponentially. The
+magnetization and the spin susceptibilities of the coupled dots are calculated.
+We show that the dephasing due to nuclear spins in GaAs can be strongly
+suppressed by dynamical nuclear spin polarization and/or by magnetic fields.",9808026v2
+2019-05-02,"Phonon dispersion, Raman spectra and evidence for spin-phonon coupling in MnV$_2$O$_4$ from first-principles","MnV$_2$O$_4$ in the spinel structure is known to exhibit coupled orbital and
+spin ordering, and its Raman spectra show interesting anomalies in its
+low-temperature phase. With a goal to explain this behavior involving coupled
+spins and phonons, we determine here the spin-phonon couplings in MnV$_2$O$_4$
+from a theoretical analysis of its phonon spectra and their dependence on
+spin-ordering and electron correlations, obtained from first-principles density
+functional theoretical calculations. Using these in an analysis based on a
+Landau-like theory, we uncover the mechanism governing the Raman anomalies
+observed in its low-temperature phase.",1905.00551v1
+2022-12-12,Magnon-Plasmon Hybridization Mediated by Spin-Orbit Interaction in Magnetic Materials,"We propose a mechanism for magnon-plasmon coupling and hybridization in
+ferromagnetic (FM) and antiferromagnetic (AFM) systems. The electric field
+associated with plasmon oscillations creates a non-equilibrium spin density via
+the inverse spin galvanic effect. This plasmon-induced spin density couples to
+magnons by an exchange interaction. The strength of magnon-plasmon coupling
+depends on the magneto-electric susceptibility of the system and the wavevector
+at which the level repulsion is happened. This wavevector may be tuned by an
+applied magnetic field. In AFM systems, the degeneracy of two chiral magnons is
+broken in the presence of a magnetic field, and we find two separate hybrid
+modes for left-handed and right-handed AFM magnons. Furthermore, we show that
+magnon-plasmon coupling in AFM systems is enhanced because of strong
+intra-sublattice spin dynamics. We argue that the recently discovered
+two-dimensional magnetic systems are ideal platforms to investigate proposed
+magnon-plasmon hybrid modes.",2212.06105v1
+2003-09-09,Spin interference effects in ring conductors subject to Rashba coupling,"Quantum interference effects in rings provide suitable means for controlling
+spin at mesoscopic scales. Here we apply such control mechanisms to coherent
+spin-dependent transport in one- and two-dimensional rings subject to Rashba
+spin-orbit coupling. We first study the spin-induced modulation of unpolarized
+currents as a function of the Rashba coupling strength. The results suggest the
+possibility of all-electrical spintronic devices. Moreover, we find signatures
+of Berry phases in the conductance previously unnoticed. Second, we show that
+the polarization direction of initially polarized, transmitted spins can be
+tuned via an additional small magnetic control flux. In particular, this
+enables to precisely reverse the polarization direction at half a flux quantum.
+We present full numerical calculations for realistic two-dimensional ballistic
+microstructures and explain our findings in a simple analytical model for
+one-dimensional rings.",0309228v2
+2013-03-08,Electron Spin Relaxation in Graphene Nanoribbon Quantum Dots,"Graphene is promising as a host material for electron spin qubits because of
+its predicted potential for long coherence times. In armchair graphene
+nanoribbons (aGNRs) a small bandgap is opened, allowing for electrically gated
+quantum dots, and furthermore the valley degeneracy is lifted. The spin
+lifetime T_1 is limited by spin relaxation, where the Zeeman energy is absorbed
+by lattice vibrations, mediated by spin-orbit and electron-phonon coupling. We
+have calculated T_1 by treating all couplings analytically and find that T_1
+can be in the range of seconds for several reasons: (i) low phonon density of
+states away from Van Hove singularities; (ii) destructive interference between
+two relaxation mechanisms; (iii) Van Vleck cancellation at low magnetic fields;
+(iv) vanishing coupling to out-of-plane modes in lowest order due to the
+electronic structure of aGNRs. Owing to the vanishing nuclear spin of 12C, T_1
+may be a good measure for overall coherence. These results and recent advances
+in the controlled production of graphene nanoribbons make this system
+interesting for spintronics applications.",1303.2027v2
+2015-04-14,Magnetic charges and magnetoelectricity in hexagonal rare-earth manganites and ferrites,"Magnetoelectric (ME) materials are of fundamental interest and show broad
+potential for technological applications. Commonly the dominant contribution to
+the ME response is the lattice-mediated one, which is proportional to both the
+Born electric charge $Z^{\rm e}$ and its analogue, the dynamical magnetic
+charge $Z^{\rm m}$. Our previous study has shown that exchange striction acting
+on noncollinear spins induces much larger magnetic charges than those that
+depend on spin-orbit coupling. The hexagonal manganites $R$MnO$_3$ and ferrites
+$R$FeO$_3$ ($R$ = Sc, Y, In, Ho-Lu) exhibit strong couplings between electric,
+magnetic and structural degrees of freedom, with the transition-metal ions in
+the basal plane antiferromagnetically coupled through super-exchange so as to
+form a 120$^\circ$ noncollinear spin arrangement. Here we present a theoretical
+study of the magnetic charges, and of the spin-lattice and spin-electronic ME
+constants, in these hexagonal manganites and ferrites, clarifying the
+conditions under which exchange striction leads to an enhanced $Z^{\rm m}$
+values and anomalously large in-plane spin-lattice ME effects.",1504.03405v1
+2017-01-13,Zeeman splitting via spin-valley-layer coupling in bilayer MoTe2,"Atomically thin transition metal dichalcogenides (TMDs) possess coupling of
+spin and valley degrees of freedom, making them promising for
+spin-valleytronics. ln monolayer TMDs, the emission helicity is locked to the
+valleys as a consequence of spin-orbit coupling and inversion symmetry
+breaking, leading to a valley analog of Zeeman effect in presence of
+out-of-plane magnetic field. As inversion symmetry is recovered in bilayers,
+the emission helicity should no longer be locked to the valleys. Here we show
+that Zeeman splitting, however, still persists in bilayers, as a result of an
+additional degree of freedom viz., the layer pseudospin and spin-valley-layer
+locking. In contrast to monolayer, Zeeman splitting here exists without lifting
+valley degeneracy. The degree of circularly polarized photoluminescence can be
+tuned with magnetic field from $-27\%$ to $27\%$. Our results demonstrate the
+control of degree of freedom in bilayer with magnetic field, which, together
+with previous electric field control, makes bilayer a promising platform for
+spin-valley quantum gates based on magnetoelectric effects.",1701.03583v1
+2012-04-02,The Spin of Holographic Electrons at Nonzero Density and Temperature,"We study the Green's function of a gauge invariant fermionic operator in a
+strongly coupled field theory at nonzero temperature and density using a dual
+gravity description. The gravity model contains a charged black hole in four
+dimensional anti-de Sitter space and probe charged fermions. In particular, we
+consider the effects of the spin of these probe fermions on the properties of
+the Green's function. There exists a spin-orbit coupling between the spin of an
+electron and the electric field of a Reissner-Nordstrom black hole. On the
+field theory side, this coupling leads to a Rashba like dispersion relation. We
+also study the effects of spin on the damping term in the dispersion relation
+by considering how the spin affects the placement of the fermionic quasinormal
+modes in the complex frequency plane in a WKB limit. An appendix contains some
+exact solutions of the Dirac equation in terms of Heun polynomials.",1204.0518v2
+2014-05-20,Electron-electron interaction mediated indirect coupling of electron and magnetic ion or nuclear spins in self-assembled quantum dots,"We show here the existence of the indirect coupling of electron and magnetic
+or nuclear ion spins in self-assembled quantum dots mediated by
+electron-electron interactions. With a single localized spin placed in the
+center of the dot, only the spins of electrons occupying the zero angular
+momentum states couple directly to the localized spin. We show that when the
+electron-electron interactions are included, the electrons occupying finite
+angular momentum orbitals interact with the localized spin. This effective
+interaction is obtained using exact diagonalization of the microscopic
+Hamiltonian as a function of the number of electronic shells, shell spacing,
+and anisotropy of the electron-Mn exchange interaction. The effective
+interaction can be engineered to be either ferromagnetic or antiferromagnetic
+by tuning the parameters of the quantum dot.",1405.4983v1
+2016-05-23,Cooling a Mechanical Resonator with a Nitrogen-Vacancy Center Ensemble Using a Room Temperature Excited State Spin-Strain Interaction,"We propose a protocol to dissipatively cool a room temperature mechanical
+resonator using a nitrogen-vacancy (NV) center ensemble. The spin ensemble is
+coupled to the resonator through its orbitally-averaged excited state, which
+has a spin-strain interaction that has not been previously characterized. We
+experimentally demonstrate that the spin-strain coupling in the excited state
+is $13.5\pm0.5$ times stronger than the ground state spin-strain coupling. We
+then theoretically show that this interaction combined with a high-density spin
+ensemble enables the cooling of a mechanical resonator from room temperature to
+a fraction of its thermal phonon occupancy.",1605.07131v2
+2017-10-06,Supercurrent as a Probe for Topological Superconductivity in Magnetic Adatom Chains,"A magnetic adatom chain, proximity coupled to a conventional superconductor
+with spin-orbit coupling, exhibits locally an odd-parity, spin-triplet pairing
+amplitude. We show that the singlet-triplet junction, thus formed, leads to a
+net spin accumulation in the near vicinity of the chain. The accumulated spins
+are polarized along the direction of the local $\mathbf{d}$-vector for triplet
+pairing and generate an enhanced persistent current flowing around the chain.
+The spin polarization and the ""supercurrent"" reverse their directions beyond a
+critical exchange coupling strength at which the singlet superconducting order
+changes its sign on the chain. The current is strongly enhanced in the
+topological superconducting regime where Majorana bound states appear at the
+chain ends. The current and the spin profile offer alternative routes to
+characterize the topological superconducting state in adatom chains and
+islands.",1710.02331v1
+2019-01-16,Spin and Quadrupole Couplings for High Spin Equatorial Intermediate Mass-ratio Coalescences,"Intermediate mass-ratio coalescences are potential signals of ground-based
+and space-based gravitational observatories. Accurate modeling of their
+waveforms within general relativity can be achieved within black hole
+perturbation theory including self-force and finite size effects. In this
+paper, we present analytic results to the Teukolsky perturbation of equatorial
+orbits in the near-horizon region of an extremely high spin black hole
+including spin coupling and finite size effects at leading order in the high
+spin limit while neglecting the self-force. We detail the critical behavior
+occuring close to the smallest specific angular momentum, and we discuss
+features of spin and quadrupole couplings.",1901.05370v2
+2019-02-25,Phonon-assisted carrier tunneling in coupled quantum dot systems with hyperfine-induced spin flip,"We calculate the rates of phonon-assisted hyperfine spin flips during
+electron and hole tunneling between quantum dots in a self-assembled quantum
+dot molecule. We show that the hyperfine process dominates over the
+spin-orbit-induced spin relaxation in magnetic fields up to a few Tesla for
+electrons, while for holes this cross-over takes place at field magnitudes of a
+fraction of Tesla, upon the assumption of a large $d$-shell admixture to the
+valence band state, resulting in a strong transverse hyperfine coupling. The
+interplay of the two spin-flip mechanisms leads to a minimum of the spin-flip
+probability, which is in principle experimentally measurable and can be used as
+a test for the presence of substantial transverse hyperfine couplings in the
+valence band.",1902.09515v2
+2019-11-28,Coupled Spin-Charge-Phonon Fluctuation in the All-In/All-Out Antiferromagnet Cd$_2$Os$_2$O$_7$,"We report on a novel spin-charge fluctuation in the all-in-all-out pyrochlore
+magnet Cd$_2$Os$_2$O$_7$, where the spin fluctuation is driven by the
+conduction of thermally excited electrons/holes and associated fluctuation of
+Os valence. The fluctuation exhibits an activation energy significantly greater
+than the spin-charge excitation gap and a peculiar frequency range of
+$10^{6}$--$10^{10}$ s$^{-1}$. These features are attributed to the hopping
+motion of carriers as small polarons in the insulating phase, where the polaron
+state is presumably induced by the magnetoelastic coupling via the strong
+spin-orbit interaction. Such a coupled spin-charge-phonon fluctuation manifests
+as a part of the metal-insulator transition that is extended over a wide
+temperature range due to the modest electron correlation comparable with other
+interactions characteristic for 5$d$-subshell systems.",1911.12500v1
+2015-08-10,Mechanically induced two-qubit gates and maximally entangled states for single electron spins in a carbon nanotube,"We theoretically analyze a system where two electrons are trapped separately
+in two quantum dots on a suspended carbon nanotube (CNT), subject to external
+ac electric driving. An indirect mechanically-induced coupling of two distant
+single electron spins is induced by the interaction between the spins and the
+mechanical motion of the CNT. We show that a two-qubit iSWAP gate and arbitrary
+single-qubit gates can be obtained from the intrinsic spin-orbit coupling.
+Combining the iSWAP gate and single-qubit gates, maximally entangled states of
+two spins can be generated in a single step by varying the frequency and the
+strength of the external electric driving field. The spin-phonon coupling can
+be turned off by electrostatically shifting the electron wave function on the
+nanotube.",1508.02107v1
+2021-10-31,Electron-Spin-Resonance in a proximity-coupled MoS2/Graphene van-der-Waals heterostructure,"Coupling graphene's excellent electron and spin transport properties with
+higher spin-orbit coupling material allows tackling the hurdle of spin
+manipulation in graphene, due to the proximity to van-der-Waals layers. Here we
+use magneto transport measurements to study the electron spin resonance on a
+combined system of graphene and MoS2 at 1.5K. The electron spin resonance
+measurements are performed in the frequency range of 18-33GHz, which allows us
+to determine the g-factor in the system. We measure average g-factor of 1.91
+for our hybrid system which is a considerable shift compared to what is
+observed in graphene on SiO2. This is a clear indication of proximity induced
+SOC in graphene in accordance with theoretical predictions.",2111.00530v2
+2023-11-28,Disordered ground state in the spin-orbit coupled $J_{\rm eff}= 1/2$ cobalt-based metal-organic framework magnet with orthogonal spin dimers,"We present the magnetic properties of a strongly spin-orbit coupled quantum
+dimer magnet based on Co$^{2+}$. The metal-organic framework compound
+Co$_2$(BDC)$_2$(DPTTZ)$_2$$\cdot$DMF features Co$^{2+}$ dimers arranged nearly
+orthogonal to each other, similar to the Shastry-Sutherland lattice. Our
+assessment based on the magnetization and heat capacity experiments reveals
+that the magnetic properties at low temperatures can be described by an
+effective $J_{\rm eff} = 1/2$ Kramers doublet and the ground state is a singlet
+with a tiny spin gap. Although the magnetic susceptibility could be analyzed in
+terms of the interacting dimer model with an isotropic intradimer coupling
+$J_0/k_{\rm B} \simeq 7.6$ K, this model fails to reproduce the shape of
+magnetization isotherm and heat capacity data. A model of isolated spin dimers
+with the anisotropic exchange couplings $J_{xy} \simeq 3.5$ K and $J_{z} \simeq
+11$ K provides an adequate description to the magnetic susceptibility,
+magnetization isotherm, and heat capacity data at low temperatures.
+Interestingly, no field-induced quantum phase phase is detected down to 100~mK
+around the critical field of gap closing, suggesting the absence of
+Bose-Einstein condensation of triplons and establishing isolated dimers with a
+negligible interdimer coupling.",2311.16890v1
+2011-09-19,Doping a spin-orbit Mott Insulator: Topological Superconductivity from the Kitaev-Heisenberg Model and possible application to (Na2/Li2)IrO3,"We study the effects of doping a Mott insulator on the honeycomb lattice
+where spins interact via direction dependent Kitaev couplings J_K, and weak
+antiferromagnetic Heisenberg couplings J. This model is known to have a spin
+liquid ground state and may potentially be realized in correlated insulators
+with strong spin orbit coupling. The effect of hole doping is studied within a
+t-J-J_K model, treated using the SU(2) slave boson formulation, which correctly
+captures the parent spin liquid. We find superconductor ground states with spin
+triplet pairing that spontaneously break time reversal symmetry. Interestingly,
+the pairing is qualitatively different at low and high dopings, and undergoes a
+first order transition with doping. At high dopings, it is smoothly connected
+to a paired state of electrons propagating with the underlying free particle
+dispersion. However, at low dopings the dispersion is strongly influenced by
+the magnetic exchange, and is entirely different from the free particle band
+structure. Here the superconductivity is fully gapped and topological,
+analogous to spin polarized electrons with px+ipy pairing. These results may be
+relevant to honeycomb lattice iridates such as A2IrO3 (A=Li or Na) on doping.",1109.4155v3
+2012-11-06,Optical Signatures of the Tunable Band Gap and Valley-Spin Coupling in Silicene,"We investigate the optical response of the silicene and similar materials,
+such as germanene, in the presence of an electrically tunable band gap for
+variable doping. The interplay of spin orbit coupling, due to the buckled
+structure of these materials, and a perpendicular electric field gives rise to
+a rich variety of phases: a topological or quantum spin Hall insulator, a
+valley-spin-polarized metal and a band insulator. We show that the dynamical
+conductivity should reveal signatures of these different phases which would
+allow for their identification along with the determination of parameters such
+as the spin orbit energy gap. We find an interesting feature where the electric
+field tuning of the band gap might be used to switch on and off the Drude
+intraband response. Furthermore, in the presence of spin-valley coupling, the
+response to circularly polarized light as a function of frequency and electric
+field tuning of the band gap is examined. Using right- and left-handed circular
+polarization it is possible to select a particular combination of spin and
+valley index. The frequency for this effect can be varied by tuning the band
+gap.",1211.1336v1
+2013-01-14,Superfluid and magnetic states of an ultracold Bose gas with synthetic three-dimensional spin-orbit coupling in an optical lattice,"We study ultracold bosonic atoms with the synthetic three-dimensional
+spin-orbit (SO) coupling in a cubic optical lattice. In the superfluidity
+phase, the lowest energy band exhibits one, two or four pairs of degenerate
+single-particle ground states depending on the SO-coupling strengths, which can
+give rise to the condensate states with spin-stripes for the weak atomic
+interactions. In the deep Mott-insulator regime, the effective spin Hamiltonian
+of the system combines three-dimensional Heisenberg exchange interactions,
+anisotropy interactions and Dzyaloshinskii-Moriya interactions. Based on Monte
+Carlo simulations, we numerically demonstrate that the resulting Hamiltonian
+with an additional Zeeman field has a rich phase diagram with spiral, stripe,
+vortex crystal, and especially Skyrmion crystal spin-textures in each xy-plane
+layer. The obtained Skyrmion crystals can be tunable with square and hexagonal
+symmetries in a columnar manner along the z axis, and moreover are stable
+against the inter-layer spin-spin interactions in a large parameter region.",1301.2869v2
+2011-11-12,Persistent charge and spin currents in a 1D ring with Rashba and Dresselhaus spin-orbit interactions by excitation with a terahertz pulse,"Persistent, oscillatory charge and spin currents are shown to be driven by a
+two-component terahertz laser pulse in a one-dimensional mesoscopic ring with
+Rashba-Dresselhaus spin orbit interactions (SOI) linear in the electron
+momentum. The characteristic interference effects result from the opposite
+precession directions imposed on the electron spin by the two SOI couplings.
+The time dependence of the currents is obtained by solving numerically the
+equation of motion for the density operator, which is later employed in
+calculating statistical averages of quantum operators on few electron
+eigenstates. The parameterization of the problem is done in terms of the SOI
+coupling constants and of the phase difference between the two laser
+components. Our results indicate that the amplitude of the oscillations is
+controlled by the relative strength of the two SOI's, while their frequency is
+determined by the difference between the excitation energies of the electron
+states. Furthermore, the oscillations of the spin current acquire a beating
+pattern of higher frequency that we associate with the nutation of the electron
+spin between the quantization axes of the two SOI couplings. This phenomenon
+disappears at equal SOI strengths, whereby the opposite precessions occur with
+the same probability.",1111.2949v1
+2018-03-27,Theory of Hole-Spin Qubits in Strained Germanium Quantum Dots,"We theoretically investigate the properties of holes in a
+Si$_{x}$Ge$_{1-x}$/Ge/ Si$_{x}$Ge$_{1-x}$ quantum well in a perpendicular
+magnetic field that make them advantageous as qubits, including a large
+($>$100~meV) intrinsic splitting between the light and heavy hole bands, a very
+light ($\sim$0.05$\, m_0$) in-plane effective mass, consistent with higher
+mobilities and tunnel rates, and larger dot sizes that could ameliorate
+constraints on device fabrication. Compared to electrons in quantum dots, hole
+qubits do not suffer from the presence of nearby quantum levels (e.g., valley
+states) that can compete with spins as qubits. The strong spin-orbit coupling
+in Ge quantum wells may be harnessed to implement electric-dipole spin
+resonance, leading to gate times of several nanoseconds for single-qubit
+rotations. The microscopic mechanism of this spin-orbit coupling is discussed,
+along with its implications for quantum gates based on electric-dipole spin
+resonance, stressing the importance of coupling terms that arise from the
+underlying cubic crystal field. Our results provide a theoretical foundation
+for recent experimental advances in Ge hole-spin qubits.",1803.10320v5
+2018-06-15,Entangled end states with fractionalized spin projection in a time-reversal-invariant topological superconducting wire,"We study the ground state and low-energy subgap excitations of a finite wire
+of a time-reversal-invariant topological superconductor (TRITOPS) with
+spin-orbit coupling. We solve the problem analytically for a long chain of a
+specific one-dimensional lattice model in the electron-hole symmetric
+configuration and numerically for other cases of the same model. We present
+results for the spin density of excitations in long chains with an odd number
+of particles. The total spin projection along the axis of the spin-orbit
+coupling $S_z= \pm 1/2$ is distributed with fractions $\pm 1/4$ localized at
+both ends, and shows even-odd alternation along the sites of the chain. We
+calculate the localization length of these excitations and find that it can be
+well approximated by a simple analytical expression. We show that the energy
+$E$ of the lowest subgap excitations of the finite chain defines tunneling and
+entanglement between end states.We discuss the effect of a Zeeman coupling
+$\Delta_Z$ on one of the ends of the chain only. For $\Delta_Z<E$, the energy
+difference of excitations with opposite spin orientation is $\Delta_Z/2$,
+consistent with a spin projection $\pm 1/4$. We argue that these physical
+features are not model dependent and can be experimentally observed in TRITOPS
+wires under appropriate conditions.",1806.06104v4
+2019-11-25,Quantum field theory of topological spin dynamics,"We develop a field theory of quantum magnets and magnetic (semi)metals, which
+is suitable for the analysis of their universal and topological properties. The
+systems of interest include collinear, coplanar and general non-coplanar
+magnets. At the basic level, we describe the dynamics of magnetic moments using
+smooth vector fields in the continuum limit. Dzyaloshinskii-Moriya interaction
+is captured by a non-Abelian vector gauge field, and chiral spin couplings
+related to topological defects appear as higher-rank antisymmetric tensor gauge
+fields. We distinguish type-I and type-II magnets by their equilibrium response
+to the non-Abelian gauge flux, and characterize the resulting lattices of
+skyrmions and hedgehogs, the spectra of spin waves, and the chiral response to
+external perturbations. The general spin-orbit coupling of electrons is
+similarly described by non-Abelian gauge fields, including higher-rank tensors
+related to the electronic Berry flux. Itinerant electrons and local moments
+exchange their gauge fluxes through Kondo and Hund interactions. Hence, by
+utilizing gauge fields, this theory provides a unifying physical picture of
+``intrinsic'' and ``topological'' anomalous Hall effects, spin-Hall effects,
+and other correlations between the topological properties of electrons and
+moments. We predict ``topological'' magnetoelectric effect in materials prone
+to hosting hedgehogs. Links to experiments and model calculations are provided
+by deriving the couplings and gauge fields from generic microscopic models,
+including the Hubbard model with spin-orbit interactions. We establish the
+possible existence of novel quantum spin liquids that exhibit a fractional
+magnetoelectric effect, and discuss a few applications to topological magnetic
+conductors like Mn$_3$Sn and Pr$_2$Ir$_2$O$_7$.",1911.11155v2
+2011-08-05,Ferromagnetic spin coupling of 2p-impurities in band insulators stabilized by intersite Coulomb interaction: Nitrogen-doped MgO,"For a nitrogen dimer in insulating MgO, a ferromagnetic coupling between
+spin-polarized $2p$-holes is revealed by calculations based on the density
+functional theory amended by an on-site Coulomb interaction and corroborated by
+the Hubbard model. It is shown that the ferromagnetic coupling is facilitated
+by a T-shaped orbital arrangement of the $2p$-holes, which is in its turn
+controlled by an intersite Coulomb interaction due to the directionality of the
+$p$-orbitals. We thus conjecture that this interaction is an important
+ingredient of ferromagnetism in band insulators with $2p$ dopants.",1108.1294v1
+2019-10-18,Probing quantum spin liquids in equilibrium using the inverse spin Hall effect,"We propose an experimental method utilizing a strongly spin-orbit coupled
+metal to quantum magnet bilayer that will probe quantum magnets lacking long
+range magnetic order, e.g., quantum spin liquids, via examination of the
+voltage noise spectrum in the metal layer. The bilayer is held in thermal and
+chemical equilibrium, and spin fluctuations arising across the single interface
+are converted into voltage fluctuations in the metal as a result of the inverse
+spin Hall effect. We elucidate the theoretical workings of the proposed bilayer
+system, and provide precise predictions for the frequency characteristics of
+the enhancement to the ac electrical resistance measured in the metal layer for
+three candidate quantum spin liquid models. Application to the Heisenberg
+spin-$1/2$ kagom{\'e} lattice model should allow for the extraction of any
+spinon gap present. A quantum spin liquid consisting of fermionic spinons
+coupled to a $U(1)$ gauge field should cause subdominant $\W^{4/3}$ scaling of
+the resistance of the coupled metal. Finally, if the magnet is well-captured by
+the Kitaev model in the gapless spin liquid phase, then the proposed bilayer
+can extract the two-flux gap which arises in spite of the gapless spectrum of
+the fermions. We therefore show that spectral analysis of the ac resistance in
+the metal in a single interface, equilibrium bilayer can test the relevance of
+a quantum spin liquid model to a given candidate material.",1910.08610v2
+2023-07-29,Comparative $^{181}$Ta-NQR Study of Weyl Monopnictides TaAs and TaP: Relevance of Weyl Fermion Excitations,"Based on our first detailed $^{181}$Ta nuclear quadrupole resonance (NQR)
+studies from 2017 on the Weyl semimetal TaP, we now extended our NQR studies to
+another Ta-based monopnictide TaAs. In the present work, we have determined the
+temperature-dependent $^{181}$Ta-NQR spectra, the spin-lattice relaxation time
+$T_{1}$, and the spin-spin relaxation time $T_{2}$. We found the following
+characteristic features that showed great contrast to what was found in TaP:
+(1) The quadrupole coupling constant and asymmetry parameter of EFG, extracted
+from three NQR frequencies, have a strong temperature dependence above $\sim$80
+K that cannot be explained by the density functional theory calculation
+incorporating the thermal expansion of the lattice. (2) The temperature
+dependence of the spin-lattice relaxation rate, $1/T_{1} T$, shows a $T^{4}$
+power law behavior above $\sim$30 K. This is a great contrast with the $1/T_{1}
+T \propto T^{2}$ behavior found in TaP, which was ascribed to the magnetic
+excitations at the Weyl nodes with a temperature-dependent orbital hyperfine
+coupling. (3) Regarding the nuclear spin-spin interaction, we found the
+spin-echo signal decays with the pulse separation simply by a Lorentzian
+function in TaAs, but we have observed spin-echo modulations in TaP that is
+most likely due to the indirect nuclear spin-spin coupling via virtually
+excited Weyl fermions. From our experimental findings, we conclude that the
+present NQR results do not show dominant contributions from Weyl fermion
+excitations in TaAs.",2307.16009v1
+2010-12-29,Competing Exotic Topological Insulator Phases in Transition Metal Oxides on the Pyrochlore Lattice with Distortion,"In this work we investigate the phase diagram of heavy (4d and 5d) transition
+metal oxides on the pyrochlore lattice, such as those of the form
+$\mathrm{A_2M_2O_7}$, where A is a rare earth element and M is a transition
+metal element. We focus on the competition between Coulomb interaction,
+spin-orbit coupling, and lattice distortion when these energy scales are
+comparable. Strong spin-orbit coupling entangles the spin and the $t_{2g}$
+$d$-orbitals giving rise to doublet $j=1/2$ and quadruplet $j=3/2$ states. In
+contrast to previous works which focused on the doublet manifold, we also
+discuss the quadruplet manifold which is relevant for several pyrochlore
+oxides. The Coulomb interaction is taken into account by use of the slave-rotor
+mean field theory and different classes of lattice distortions which further
+split the levels of the quadruplet $j=3/2$ manifold are studied. Various
+topological phases are predicted, including exotic strong and weak topological
+Mott insulating phases. We discuss the general structure of the phase diagram
+for several values of $d$-shell filling and various symmetry classes of lattice
+distortions. Our results are relevant to the search for exotic topological
+insulators and quantum spin liquids in strongly correlated materials with
+strong spin-orbit coupling.",1101.0007v2
+2014-05-11,Controllable Spin-Charge Transport in Strained Graphene Nanoribbon Devices,"We theoretically investigate the spin-charge transport in two-terminal device
+of graphene nanoribbons in the presence of an uniform uniaxial strain,
+spin-orbit coupling, exchange field and smooth staggered potential. We show
+that the direction of applied strain can efficiently tune strain-strength
+induced oscillation of band-gap of armchair graphene nanoribbon (AGNR). It is
+also found that electronic conductance in both AGNR and zigzag graphene
+nanoribbons (ZGNRs) oscillates with Rashba spin-orbit coupling akin to the
+Datta-Das field effect transistor. Two distinct strain response regimes of
+electronic conductance as function of spin-orbit couplings (SOC) magnitude are
+found. In the regime of small strain, conductance of ZGNR presents stronger
+strain dependence along the longitudinal direction of strain. Whereas for high
+values of strain shows larger effect for the transversal direction.
+Furthermore, the local density of states (LDOS) shows that depending on the
+smoothness of the staggered potential, the edge state of AGNR can either emerge
+or be suppressed. These emerging states can be determined experimentally by
+performing spatially scanning tunneling microscope or by scanning tunneling
+spectroscopy. Our findings open up new paradigms of manipulation and control of
+strained graphene based nanostructure for application on novel topological
+quantum devices.",1405.2497v1
+2018-09-26,Phase transitions of the Kane-Mele-Hubbard model with a long-range hopping,"The interacting Kane-Mele model with a long-range hopping is studied using
+analytical method. The original Kane-Mele model is defined on a honeycomb
+lattice. In the work, we introduce a four-lattice-constant range hopping and
+the on-site Hubbard interaction into the model and keep its lattice structure
+unchanged. From the single-particle energy spectrum, we obtain the critical
+strength of the long-range hopping $t_L$ at which the topological transition
+occurs in the non-interacting limit of the model and our results show that it
+is independent of the spin-orbit coupling. After introducing the Hubbard
+interaction, we investigate the Mott transition and the magnetic transition of
+the generalized strongly correlated Kane-Mele model using the slave-rotor mean
+field theory and Hartree-Fock mean field theory respectively. In the small
+long-range hopping region, it is a correlated quantum spin Hall state below the
+Mott transition, while a topological Mott insulator above the Mott transition.
+By comparing the energy band of spin degree of freedom with the one of
+electrons in non-interacting limit, we find a condition for the $t_L$-driven
+topological transition. Under the condition, critical values of $t_L$ at which
+the topological transition occurs are obtain numerically from seven
+self-consistency equations in both regions below and above the Mott transition.
+Influences of the interaction and the spin-orbit coupling on the topological
+transition are discussed in this work. Finally, we show complete phase diagrams
+of the generalized interacting topological model at some strength of
+spin-orbital coupling.",1809.09903v3
+2020-12-29,Controlling Synthetic Spin-Orbit Coupling in a Silicon Quantum Dot with Magnetic Field,"Tunable synthetic spin-orbit coupling (s-SOC) is one of the key challenges in
+various quantum systems, such as ultracold atomic gases, topological
+superconductors, and semiconductor quantum dots. Here we experimentally
+demonstrate controlling the s-SOC by investigating the anisotropy of
+spin-valley resonance in a silicon quantum dot. As we rotate the applied
+magnetic field in-plane, we find a striking nonsinusoidal behavior of resonance
+amplitude that distinguishes s-SOC from the intrinsic spin-orbit coupling
+(i-SOC), and associate this behavior with the previously overlooked in-plane
+transverse magnetic field gradient. Moreover, by theoretically analyzing the
+experimentally measured s-SOC field, we predict the quality factor of the spin
+qubit could be optimized if the orientation of the in-plane magnetic field is
+rotated away from the traditional working point.",2012.14636v2
+2018-07-23,Proximity-Induced Mixed Odd and Even Frequency Pairings in Monolayer NbSe$_2$,"Monolayer superconducting transition metal dichalcogenide NbSe$_2$ is a
+candidate for a nodal topological superconductor by magnetic field. Because of
+the so-called Ising spin-orbit coupling that strongly pins the electron spins
+to the out-of-plane direction, Cooper pairs in monolayer superconductor
+NbSe$_2$ are protected against an applied in-plane magnetic field much larger
+than the Pauli limit. In monolayer NbSe$_2$, in addition to the Fermi pockets
+at the corners of Brillouin zone with opposite crystal momentum similar to
+other semiconducting transition metal dichalcogenides, there is an extra Fermi
+pocket around the $\Gamma$ point with much smaller spin splitting, which could
+lead to an alternative strategy for pairing possibilities that are manipulable
+by a smaller magnetic field. By considering a monolayer NbSe$_2$-ferromagnet
+substrate junction, we explore the modified pairing correlations on the pocket
+at $\Gamma$ point in hole-doped monolayer NbSe$_2$. The underlying physics is
+fascinating as there is a delicate interplay of the induced exchange field and
+the Ising spin-orbit coupling. We realize a mixed singlet-triplet
+superconductivity, s+f, due to the Ising spin-orbit coupling. Moreover, our
+results reveal the admixture state including both odd- and even-frequency
+components, associated with the ferromagnetic proximity effect. Different
+frequency symmetries of the induced pairing correlations can be realized by
+manipulating the magnitude and direction of the induced magnetization.",1807.08470v1
+2020-11-15,Van Vleck excitons in Ca$_{2}$RuO$_{4}$,"A framework is presented for modeling and understanding magnetic excitations
+in localized, intermediate coupling magnets where the interplay between
+spin-orbit coupling, magnetic exchange, and crystal field effects are known to
+create a complex landscape of unconventional magnetic behaviors and ground
+states. A spin-orbit exciton approach for modeling these excitations is
+developed based upon a Hamiltonian which explicitly incorporates single-ion
+crystalline electric field and spin exchange terms. This framework is then
+leveraged to understand a canonical Van Vleck $j\rm{_{eff}}=0$ singlet ground
+state whose excitations are coupled spin and crystalline electric field levels.
+Specifically, the anomalous Higgs mode [Jain et al. Nat. Phys. 13, 633 (2017)],
+spin-waves [S. Kunkem\""{o}ller et al. Phys. Rev. Lett. 115, 247201 (2015)], and
+orbital excitations [L. Das et al. Phys. Rev. X 8, 011048 (2018)] in the
+multiorbital Mott insulator Ca$_2$RuO$_4$ are captured and good agreement is
+found with previous neutron and inelastic x-ray spectroscopic measurements.
+Furthermore, our results illustrate how a crystalline electric field-induced
+singlet ground state can support coherent longitudinal, or amplitude
+excitations, and transverse wavelike dynamics. We use this description to
+discuss mechanisms for accessing a nearby critical point.",2011.07425v1
+2020-03-09,Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices,"Light-induced spin-orbit coupling is a flexible tool to study quantum
+magnetism with ultracold atoms. In this work we show that spin-orbit coupled
+Bose gases in a one-dimensional optical lattice can be mapped into a two-leg
+triangular ladder with staggered flux following a lowest-band truncation of the
+Hamiltonian. The effective flux and the ratio of the tunneling strengths can be
+independently adjusted to a wide range of values. We identify a certain regime
+of parameters where a hard-core boson approximation holds and the system
+realizes a frustrated triangular spin ladder with tunable flux. We study the
+properties of the effective spin Hamiltonian using the density-matrix
+renormalization-group method and determine the phase diagram at half-filling.
+It displays two phases: a uniform superfluid and a bond-ordered insulator. The
+latter can be stabilized only for low Raman detuning. Finally, we provide
+experimentally feasible trajectories across the parameter space of the SOC
+system that cross the predicted phase transition.",2003.04154v3
+2022-03-30,Realization of the topological Hopf term in two-dimensional lattice models,"It is known that a two-dimensional spin system can acquire a topological Hopf
+term by coupling to massless Dirac fermions whose energy spectrum has a single
+cone. But it is challenging to realize the Hopf term in condensed matter
+physics due to the fermion-doubling in the low-energy spectrum. In this work we
+propose a scenario to realize the Hopf term in lattice models. The central aim
+is tuning the coupling between the spins and the Dirac fermions such that the
+topological terms contributed by the two cones do not cancel each other. To
+this end, we consider $p_x$ and $p_y$ orbitals for the Dirac fermions on the
+honeycomb lattice such that there are totally four bands. By utilizing the
+orbital degrees of freedom, a $\theta=2\pi$ Hopf term is successfully generated
+for the spin system after integrating out the Dirac fermions. If the fermions
+have a small gap $m_0$ or if the spin-orbit coupling is considered, then
+$\theta$ is no longer quantized, but it may flow to multiple of $2\pi$ under
+renormalization. The ground state and the physical response of a spin system
+having the Hopf term are discussed.",2203.16480v3
+2010-02-22,Spin fluctuations and superconductivity in noncentrosymmetric heavy fermion systems CeRhSi$_3$ and CeIrSi$_3$,"We study the normal and the superconducting properties in noncentrosymmetric
+heavy fermion superconductors CeRhSi$_3$ and CeIrSi$_3$. For the normal state,
+we show that experimentally observed linear temperature dependence of the
+resistivity is understood through the antiferromagnetic spin fluctuations near
+the quantum critical point (QCP) in three dimensions. For the superconducting
+state, we derive a general formula to calculate the upper critical field
+$H_{c2}$, with which we can treat the Pauli and the orbital depairing effect on
+an equal footing. The strong coupling effect for general electronic structures
+is also taken into account. We show that the experimentally observed features
+in $H_{c2}\parallel \hat{z}$, the huge value up to 30(T), the downward
+curvatures, and the strong pressure dependence, are naturally understood as an
+interplay of the Rashba spin-orbit interaction due to the lack of inversion
+symmetry and the spin fluctuations near the QCP. The large anisotropy between
+$H_{c2}\parallel \hat{z}$ and $H_{c2}\perp \hat{z}$ is explained in terms of
+the spin-orbit interaction. Furthermore, a possible realization of the
+Fulde-Ferrell- Larkin-Ovchinnikov state for $H\perp \hat{z}$ is studied. We
+also examine effects of spin-flip scattering processes in the pairing
+interaction and those of the applied magnetic field on the spin fluctuations.
+We find that the above mentioned results are robust against these effects. The
+consistency of our results strongly supports the scenario that the
+superconductivity in CeRhSi$_3$ and CeIrSi$_3$ is mediated by the spin
+fluctuations near the QCP.",1002.4031v1
+2014-04-25,"Orbit- and Atom-Resolved Spin Textures of Intrinsic, Extrinsic and Hybridized Dirac Cone States","Combining first-principles calculations and spin- and angle-resolved
+photoemission spectroscopy measurements, we identify the helical spin textures
+for three different Dirac cone states in the interfaced systems of a 2D
+topological insulator (TI) of Bi(111) bilayer and a 3D TI Bi2Se3 or Bi2Te3. The
+spin texture is found to be the same for the intrinsic Dirac cone of Bi2Se3 or
+Bi2Te3 surface state, the extrinsic Dirac cone of Bi bilayer state induced by
+Rashba effect, and the hybridized Dirac cone between the former two states.
+Further orbit- and atom-resolved analysis shows that s and pz orbits have a
+clockwise (counterclockwise) spin rotation tangent to the iso-energy contour of
+upper (lower) Dirac cone, while px and py orbits have an additional radial spin
+component. The Dirac cone states may reside on different atomic layers, but
+have the same spin texture. Our results suggest that the unique spin texture of
+Dirac cone states is a signature property of spin-orbit coupling, independent
+of topology.",1404.6306v1
+2016-12-04,Anisotropic Pauli Spin Blockade of Holes in a GaAs Double Quantum Dot,"Electrically defined semiconductor quantum dots are attractive systems for
+spin manipulation and quantum information processing. Heavy-holes in both Si
+and GaAs are promising candidates for all-electrical spin manipulation, owing
+to the weak hyperfine interaction and strong spin-orbit interaction. However,
+it has only recently become possible to make stable quantum dots in these
+systems, mainly due to difficulties in device fabrication and stability. Here
+we present electrical transport measurements on holes in a gate-defined double
+quantum dot in a $\mathrm{GaAs/Al_xGa_{1-x}As}$ heterostructure. We observe
+clear Pauli spin blockade and demonstrate that the lifting of this spin
+blockade by an external magnetic field is highly anisotropic. Numerical
+calculations of heavy-hole transport through a double quantum dot in the
+presence of strong spin-orbit coupling show quantitative agreement with
+experimental results and suggest that the observed anisotropy can be explained
+by both the anisotropic effective hole g-factor and the surface Dresselhaus
+spin-orbit interaction.",1612.01062v1
+2021-10-06,"Stacking-order effect on spin-orbit torque, spin-Hall magnetoresistance, and magnetic anisotropy in Ni$_{81}$Fe$_{19}$-IrO$_2$ bilayers","The 5d transition-metal oxides have been an intriguing platform to
+demonstrate efficient charge to spin current conversion due to a unique
+electronic structure dominated by strong spin-orbit coupling. Here, we report
+on stacking-order effect of spin-orbit torque (SOT), spin-Hall
+magnetoresistance, and magnetic anisotropy in bilayer Ni$_{81}$Fe$_{19}$-5d
+iridium oxide, IrO$_2$. While all the IrO$_2$ and Pt control samples exhibit
+large dampinglike-SOT generation stemming from the efficient charge to spin
+current conversion, the magnitude of the SOT is larger in the IrO$_2$
+(Pt)-bottom sample than in the IrO$_2$ (Pt)-top one. The fieldlike-SOT has even
+more significant stack order effect, resulting in an opposite sign in the
+IrO$_2$ samples in contrast to the same sign in the Pt samples. Furthermore, we
+observe that the magnetic anisotropy energy density and the anomalous Hall
+effect are increased in the IrO$_2$ (Pt)-bottom sample, suggesting enhanced
+interfacial perpendicular magnetic anisotropy. Our findings highlight the
+significant influence of the stack order on spin transport and magnetotransport
+properties of Ir oxide/ferromagnet systems, providing useful information on
+design of SOT devices including 5d transition-metal oxides.",2110.02517v1
+2010-01-27,Quantum dot spin qubits in Silicon: Multivalley physics,"Research on Si quantum dot spin qubits is motivated by the long spin
+coherence times measured in Si, yet the orbital spectrum of Si dots is
+increased as a result of the valley degree of freedom. The valley degeneracy
+may be lifted by the interface potential, which gives rise to a valley-orbit
+coupling, but the latter depends on the detailed structure of the interface and
+is generally unknown a priori. These facts motivate us to provide an extensive
+study of spin qubits in Si double quantum dots, accounting fully for the valley
+degree of freedom and assuming no prior knowledge of the valley-orbit coupling.
+For single-spin qubits we analyze the spectrum of a multivalley double quantum
+dot, discuss the initialization of one qubit, identify the conditions for the
+lowest energy two-electron states to be a singlet and a triplet well separated
+from other states, and determine analytical expressions for the exchange
+splitting. For singlet-triplet qubits we analyze the single-dot spectrum and
+initialization process, the double-dot spectrum, singlet-triplet mixing in an
+inhomogeneous magnetic field and the peculiarities of spin blockade in
+multivalley qubits. We review briefly the hyperfine interaction in Si and
+discuss its role in spin blockade in natural Si, including intravalley and
+intervalley effects. We study the evolution of the double-dot spectrum as a
+function of magnetic field. We address briefly the situation in which the
+valley-orbit coupling is different in each dot due to interface roughness. We
+propose a new experiment for measuring the valley splitting in a single quantum
+dot. We discuss the possibility of devising other types of qubits in Si QDs,
+and the size of the intervaley coupling due to the Coulomb interaction.",1001.5040v2
+2010-06-14,Evidence of Possible Spin-Orbit Misalignment Along the Line of Sight in Transiting Exoplanet Systems,"Of the 26 transiting exoplanet systems with measurements of the
+Rossiter-McLaughlin (RM) effect, eight have now been found to be significantly
+spin-orbit misaligned in the plane of the sky. Unfortunately, the RM effect
+only measures the angle between the orbit of a transiting exoplanet and the
+spin of its host star projected in the plane of sky, leaving unconstrained the
+compliment misalignment angle between the orbit of the planet and the spin of
+its host star along the line of sight. I use a simple model of stellar rotation
+benchmarked with observational data to statistically identify ten exoplanet
+systems from a sample of 75 for which there is likely a significant degree of
+misalignment along the line of sight between the orbit of the planet and the
+spin of its host star. I find that HAT-P-7, HAT-P-14, HAT-P-16, HD 17156,
+Kepler-5, Kepler-7, TrES-4, WASP-1, WASP-12, and WASP-14 are likely spin-orbit
+misaligned along the line of sight. All ten systems have host stellar masses
+M_star in the range 1.2 M_sun <= M_star <= 1.5 M_sun, and the probability of
+this occurrence by chance is less than one in ten thousand. In addition, the
+planets in the candidate misaligned systems are preferentially massive and
+eccentric. The coupled distribution of misalignment from the RM effect and from
+this anaylsis suggests that transiting exoplanets are more likely to be
+spin-orbit aligned than expected given predictions for a transiting planet
+population produced entirely by planet-planet scattering or Kozai cycles and
+tidal friction. For that reason, there are likely two populations of close-in
+exoplanet systems: a population of aligned systems and a population of
+apparently misaligned systems in which the processes that lead to misalignment
+or to the survival of misaligned systems operate more efficiently in systems
+with massive stars and planets. (abridged)",1006.2851v1
+2020-07-26,Spin-orbit quantum impurity and quantization in a topological magnet,"Quantum states induced by single-atomic impurities are at the frontier of
+physics and material science. While such states have been reported in
+high-temperature superconductors and dilute magnetic semiconductors, they are
+unexplored in topological magnets which can feature spin-orbit tunability. Here
+we use spin-polarized scanning tunneling microscopy/spectroscopy (STM/S) to
+study the engineered quantum impurity in a topological magnet Co3Sn2S2. We find
+that each substituted In impurity introduces a striking localized bound state.
+Our systematic magnetization-polarized probe reveals that this bound state is
+spin-down polarized, in lock with a negative orbital magnetization. Moreover,
+the magnetic bound states of neighboring impurities interact to form quantized
+orbitals, exhibiting an intriguing spin-orbit splitting, analogous to the
+splitting of the topological fermion line. Our work collectively demonstrates
+the strong spin-orbit effect of the single-atomic impurity at the quantum
+level, suggesting that a nonmagnetic impurity can introduce spin-orbit coupled
+magnetic resonance in topological magnets.",2007.13738v1
+2016-10-09,Eccentricity and Spin-Orbit Misalignment in Short-Period Stellar Binaries as a Signpost of Hidden Tertiary Companions,"Eclipsing binaries are observed to have a range of eccentricities and
+spin-orbit misalignments (stellar obliquities). Whether such properties are
+primordial, or arise from post-formation dynamical interactions remains
+uncertain. This paper considers the scenario in which the binary is the inner
+component of a hierarchical triple stellar system, and derives the requirements
+that the tertiary companion must satisfy in order to raise the eccentricity and
+obliquity of the inner binary. Through numerical integrations of the secular
+octupole-order equations of motion of stellar triples, coupled with the spin
+precession of the oblate primary star due to the torque from the secondary, we
+obtain a simple, robust condition for producing spin-orbit misalignment in the
+inner binary: In order to excite appreciable obliquity, the precession rate of
+the stellar spin axis must be smaller than the orbital precession rate due to
+the tertiary companion. This yields quantitative requirements on the mass and
+orbit of the tertiary. We also present new analytic expressions for the maximum
+eccentricity and range of inclinations allowing eccentricity excitation
+(Lidov-Kozai window), for stellar triples with arbitrary masses and including
+the non-Keplerian potentials introduced by general relativity, stellar tides
+and rotational bulges. The results of this paper can be used to place
+constraints on unobserved tertiary companions in binaries that exhibit high
+eccentricity and/or spin-orbit misalignment, and will be helpful in guiding
+efforts to detect external companions around stellar binaries. As an
+application, we consider the eclipsing binary DI Herculis, and identify the
+requirements that a tertiary companion must satisfy to produce the observed
+spin-orbit misalignment.",1610.02626v2
+2019-05-01,Black Hole and Neutron Star Binary Mergers in Triple Systems: II. Merger Eccentricity and Spin-Orbit Misalignment,"We study the dynamical signatures of black hole (BH) and neutron star (NS)
+binary mergers via Lidov-Kozai oscillations induced by tertiary companions in
+hierarchical triple systems. For each type of binaries (BH-BH and BH-NS), we
+explore a wide range of binary/triple parameters that lead to binary mergers,
+and determine the distributions of eccentricity ($e_\mathrm{m}$) and spin-orbit
+misalignment angle ($\theta_\rm {sl}^\rm f$) when the binary enters the
+LIGO/VIRGO band. We use the double-averaged (over both orbits) and
+single-averaged (over the inner orbit) secular equations, as well as N-body
+integration, to evolve systems with different hierarchy levels, including the
+leading-order post-Newtonian effect, spin-orbit coupling and gravitational
+radiation. We find that for merging BH-BH binaries with comparable masses,
+about $7\%$ have $e_\mathrm{m}>0.1$ and $0.7\%$ have $e_{\rm m}>0.9$. The
+majority of the mergers have significant eccentricities in the LISA band. The
+BH spin evolution and $\theta_\rm {sl}^\rm f$ are correlated with the orbital
+evolution and $e_{\rm m}$. Mergers with $e_{\rm m} \lesssim 10^{-3}$ have a
+distribution of $\theta_\rm {sl}^\rm f$ that peaks around $90^\circ$ (and thus
+favoring a projected binary spin parameter $\chi_{\rm eff}\sim 0$), while
+mergers with larger $e_{\rm m}$ have a more isotropic spin-orbit misalignments.
+For typical BH-NS binaries, strong octuple effects lead to more mergers with
+non-negligible $e_\mathrm{m}$ (with $\sim 18\%$ having $e_\mathrm{m}>0.1$ and
+$2.5\%$ having $e_\mathrm{m}>0.9$), and the final BH spin axis tends to be
+randomly orientated. Measurements or constraints on eccentric mergers and
+$\theta_\rm {sl}^\rm f$ from LIGO/VIRGO and LISA would provide useful
+diagnostics on the dynamical formation of merging BH or NS binaries in triples.",1905.00427v2
+2023-03-02,A protected spin-orbit induced absorption divergence in distorted Landau levels,"The effect of spin-orbit (and Darwin) interaction on a 2D electron gas
+subject to a radial symmetric, inhomogeneous $1/r$-magnetic field is discussed
+analytically in a perturbative and non-perturbative manner. For this purpose,
+we investigate the radial Hall conductivity that emerges from an additional
+homogeneous electric field perturbation perpendicular to the 2D electron gas,
+which solely interacts via spin-orbit coupling. Numerical calculations of the
+absorptive spin-orbit spectra show for an ideal InSb electron gas a behaviour
+that is dominated by the localized (atomic) part of the distorted Landau
+levels. In contrast, however, we also find analytically that a (non-local)
+divergent static response emerges for Fermi energies close to the ionization
+energy in the thermodynamic limit. The divergent linear response implies that
+the external electric field is entirely absorbed outside the 2D electron gas by
+induced radial spin-orbit currents, as it would be the case inside a perfect
+conductor. This spin-orbit induced polarization mechanism depends on the
+effective $g^*$-factor of the material for which it shows a critical behaviour
+at $g^*_c=2$, where it abruptly switches direction. The diverging absorption
+relies on the presence of degenerate energies with allowed selection rules that
+are imposed by the radial symmetry of our inhomogeneous setup. We show
+analytically the presence of a discrete Rydberg-like band structure that obeys
+these symmetry properties. In a last step, we investigate the robustness of the
+spectra by solving analytically the Dirac equation expanded up to order
+$1/(mc)^2$. We find that the distorted Landau-levels, and thus the divergent
+spin-orbit polarization, remain protected with respect to slow changes of the
+applied $1/r$-magnetic field.",2303.01286v2
+1999-12-15,Spin-1 chain doped with mobile S=1/2 fermions,"We investigate doping of a two-orbital chain with mobile $S=1/2$ fermions as
+a valid model for $\rm Y_{2-x}Ca_xBaNiO_5$. The S=1 spins are stabilized by
+strong, ferromagnetic (fm) Hund's rule couplings. We calculate correlation
+functions and thermodynamic quantities by DMRG methods and find a new hierarchy
+of energy scales in the spin sector upon doping. Gapless spin-excitations are
+generated at a lower energy scale by interactions among itinerant polarons
+created by each hole and coexist with the larger scale of the gapful
+spin-liquid background of the S=1 chain accompanied by a finite string-order
+parameter.",9912273v1
+2001-08-29,Magnetic Semiconductors are Frustrated Ferromagnets,"Starting from microscopic and symmetry considerations, we derive the
+Hamiltonian describing the exchange interaction between the localized Mn spins
+and the valence band holes in $Ga_{1-x}Mn_x As$. We find that due to the strong
+spin-orbit coupling in the valence band, this exchange interaction has a rather
+complex structure and generates a highly anisotropic effective interaction
+between the Mn spins. The corresponding ground state has a finite ferromagnetic
+magnetization but is intrinsically spin-disordered even at zero temperature.",0108477v1
+2003-03-26,Chern Numbers for Spin Models of Transition Metal Nanomagnets,"We argue that ferromagnetic transition metal nanoparticles with fewer than
+approximately 100 atoms can be described by an effective Hamiltonian with a
+single giant spin degree of freedom. The total spin $S$ of the effective
+Hamiltonian is specified by a Berry curvature Chern number that characterizes
+the topologically non-trivial dependence of a nanoparticle's many-electron
+wavefunction on magnetization orientation. The Berry curvatures and associated
+Chern numbers have a complex dependence on spin-orbit coupling in the
+nanoparticle and influence the semiclassical Landau-Liftshitz equations that
+describe magnetization orientation dynamics.",0303555v1
+2003-10-06,Dissipation effects in spin-Hall transport of electrons and holes,"We investigate the spin-Hall effect of both electrons and holes in
+semiconductors using the Kubo formula in the correct zero-frequency limit
+taking into account the finite momentum relaxation time of carriers in real
+semiconductors. This approach allows to analyze the range of validity of recent
+theoretical findings. In particular, the spin-Hall conductivity vanishes for
+vanishing spin-orbit coupling if the correct zero-frequency limit is performed.",0310108v3
+2003-11-04,Quantum dots based on spin properties of semiconductor heterostructures,"The possibility of a novel type of semiconductor quantum dots obtained by
+spatially modulating the spin-orbit coupling intensity in III-V
+heterostructures is discussed. Using the effective mass model we predict
+confined one-electron states having peculiar spin properties. Furthermore, from
+mean field calculations (local-spin-density and Hartree-Fock) we find that even
+two electrons could form a bound state in these dots.",0311077v2
+2003-12-14,Theory of spin waves in diluted-magnetic-semiconductor quantum wells,"We present a theory of collective spin excitations in
+diluted-magnetic-semiconductor quantum wells in which local magnetic moments
+are coupled via a quasi-two-dimensional gas of electrons or holes. In the case
+of a ferromagnetic state with partly spin-polarized electrons, we find that the
+Goldstone collective mode has anomalous $k^4$ dispersion and that for symmetric
+quantum wells odd parity modes do not disperse at all. We discuss the gap in
+the collective excitation spectrum which appears when spin-orbit interactions
+are included.",0312347v2
+2004-07-09,Electronic and spin properties of Rashba billiards,"Ballistic electrons confined to a billiard and subject to spin--orbit
+coupling of the Rashba type are investigated, using both approximate
+semiclassical and exact quantum--mechanical methods. We focus on the
+low--energy part of the spectrum that has negative eigenvalues. When the spin
+precession length is smaller than the radius of the billiard, the low--lying
+energy eigenvalues turn out to be well described semiclassically. Corresponding
+eigenspinors are found to have a finite spin polarization in the direction
+perpendicular to the billiard plane.",0407247v1
+2004-11-27,Geometric spin dephasing of carriers with strong spin-orbit coupling,"It has been shown that the geometric Berry-phase shift acquired by the
+components of the light hole (LH) spinor during an adiabatic collision is equal
+to the angular distance traveled by the wave vector. For LH, geometric
+dephasing leads to equality between angular and crystal momentum relaxation
+time. I will show that the same mechanism is completely ineffective for heavy
+and split-off holes in bulk crystals, and in electron QSLs in spherical
+nanostructures. This non-model result suggests that these carriers may be
+considered as the stern candidates for implementation of dissipationless spin
+currents (Spin Hall effect) and fault-tolerant qubits.",0411683v1
+2004-12-19,Oscillatory spin relaxation rates in quantum dots,"Phonon-induced spin relaxation rates in quantum dots are studied as function
+of in-plane and perpendicular magnetic fields, temperature and electric field,
+for different dot sizes. We consider Rashba and Dresselhaus spin-orbit mixing
+in diferent materials, and show how Zeeman sublevels can relax via
+piezoelectric and deformation potential coupling to acoustic phonons. We find
+that strong lateral and vertical confinements may induce minima in the rates at
+particular values of the magnetic field, where spin relaxation times can reach
+even seconds. We obtain good agreement with experimental findings in GaAs
+quantum dots.",0412520v1
+2005-04-07,Quantum Spin Hall Effect,"The quantum Hall liquid is a novel state of matter with profound emergent
+properties such as fractional charge and statistics. Existence of the quantum
+Hall effect requires breaking of the time reversal symmetry caused by an
+external magnetic field. In this work, we predict a quantized spin Hall effect
+in the absence of any magnetic field, where the intrinsic spin Hall conductance
+is quantized in units of $2 \frac{e}{4\pi}$. The degenerate quantum Landau
+levels are created by the spin-orbit coupling in conventional semiconductors in
+the presence of a strain gradient. This new state of matter has many profound
+correlated properties described by a topological field theory.",0504147v1
+2006-05-29,Nuclear spin effect in metallic spin valve,"We study electronic transport through a ferromagnet normal-metal ferromagnet
+system and we investigate the effect of hyperfine interaction between electrons
+and nuclei in the normal-metal part. A switching of the magnetization
+directions of the ferromagnets causes nuclear spins to precess. We show that
+the effect of this precession on the current through the system is large enough
+to be observed in experiment.",0605703v2
+2006-09-16,Anomalous k-dependent spin splitting in wurtzite AlxGa1-xN/GaN heterostructures,"We have confirmed the k-dependent spin splitting in wurtzite AlxGa1-xN/GaN
+heterostructures. Anomalous beating pattern in Shubnikov-de Haas measurements
+arises from the interference of Rashba and Dresselhaus spin-orbit interactions.
+The dominant mechanism for the k-dependent spin splitting at high values of k
+is attributed to Dresselhaus term which is enhanced by the Delta C1-Delta C3
+coupling of wurtzite band folding effect.",0609396v2
+2007-01-29,"Comment on ""Nonexistence of ""Spin Transverse Force"" for a Relativistic Electron"" by Wlodek Zawadzki (cond-mat/0701387)","This is a reply to W. Zawadzki's paper (arXiv: cond-mat/0701378) on
+non-exietence of spin transverse force for a relativistic electron. The force
+was first proposed by the present author that the spin current will experience
+a transverse force in an electric field as a relativistic quantum mechanical
+effect, and in semiconductor with Rahsba spin-orbit coupling. Zawadzki's
+approach is based on an incorrect relation between the velocity and canonical
+momentum, and his conclusion is not true.",0701700v1
+2007-03-07,Theory of resonant spin Hall effect,"A biref review is presented on resonant spin Hall effect, where a tiny
+external electric field induces a saturated spin Hall current in a
+2-dimensional electron or hole gas in a perpendicular magnetic field. The
+phenomenon is attributted to the energy level crossing associated with the
+spin-orbit coupling and the Zeeman splitting. We summarize recent theoretical
+development of the effect in various systems and discuss possible experiments
+to observe the effect.",0703176v1
+2007-03-12,Transit-Time Spin Field-Effect-Transistor,"We propose and analyze a four-terminal metal-semiconductor device that uses
+hot-electron transport through thin ferromagnetic films to inject and detect a
+charge-coupled spin current transported through the conduction band of an
+arbitrary semiconductor. This provides the possibility of realizing a spin
+field-effect-transistor in Si, using electrostatic transit-time control in a
+perpendicular magnetic field, rather than Rashba effect with spin-orbit
+interaction.",0703300v1
+2004-11-19,Spinning particles in the vacuum C metric,"The motion of a spinning test particle given by the Mathisson-Papapetrou
+equations is studied on an exterior vacuum C metric background spacetime
+describing the accelerated motion of a spherically symmetric gravitational
+source. We consider circular orbits of the particle around the direction of
+acceleration of the source. The symmetries of this configuration lead to the
+reduction of the differential equations of motion to algebraic relations. The
+spin supplementary conditions as well as the coupling between the spin of the
+particle and the acceleration of the source are discussed.",0411098v1
+1997-02-06,How Much of the Nucleon Spin is Carried by Glue?,"We estimate in the QCD sum rule approach the amount of the nucleon spin
+carried by the gluon angular momentum: the sum of the gluon spin and orbital
+angular momenta. The result indicates that gluons contribute at least one half
+of the nucleon spin at scale of 1 GeV^2.",9702277v2
+2007-04-06,Spin accumulation from the non-Abelian Aharonov-Bohm effect,"Recently, it has been shown that the spin-orbit coupling (SOC) of the
+Dresselhaus type in $[110]$ quantum wells can be mathematically removed by a
+non-Abelian gauge transformation. In the presence of an additional uniform
+magnetic field, such a non-Abelian gauge flux leads to a spin accumulation at
+the edges of the sample, where the relative sign of the spin accumulation
+between the edges can be tuned by the sign of the Dresselhaus SOC constant. Our
+prediction can be tested by Kerr measurements within the available experimental
+sensitivities.",0704.0830v1
+2007-07-27,Spin-triplet pairing instability of the spinon Fermi surface in a U(1) spin liquid,"Recent experiments on the organic compound \kappa-(ET)_2Cu_2(CN)_3 have
+provided a promising example of a two dimensional spin liquid state. This phase
+is described by a two-dimensional spinon Fermi sea coupled to a U(1) gauge
+field. We study Kohn-Luttinger-like pairing instabilities of the spinon Fermi
+surface due to singular interaction processes with twice-the-Fermi-momentum
+transfer. We find that under certain circumstances the pairing instability
+occurs in odd-orbital-angular-momentum/spin-triplet channels. Implications to
+experiments are discussed.",0707.4031v1
+2008-05-06,Spin-Hall Effect in A Symmetric Quantum Wells by A Random Rashba Field,"Changes dopant ion concentrations in the sides of a symmetric quantum well
+are known to create a random Rashba-type spin-orbit coupling. Here we
+demonstrate that, as a consequence, a finite size spin-Hall effect is also
+present. Our numerical algorithm estimates the result of the Kubo formula for
+the spin-Hall conductivity, by using a tight-binding approximation of the
+Hamiltonian in the framework of a time-dependent Green's function formalism,
+well suited for very large systems.",0805.0678v1
+2008-06-05,Thermally Assisted Spin Hall Effect,"The spin polarized charge transport is systematically analyzed as a thermally
+driven stochastic process. The approach is based on Kramers' equation
+describing the semiclassical motion under the inclusion of stochastic and
+damping forces. Due to the relativistic spin-orbit coupling the damping
+experiences a relativistic correction leading to an additional contribution
+within the spin Hall conductivity. A further contribution to the conductivity
+is originated from the averaged underlying crystal potential, the mean value of
+which depends significantly on the electric field. We derive an exact
+expression for the electrical conductivity. All corrections are estimated in
+lowest order of a relativistic approach and in the linear response regime.",0806.0948v1
+2008-06-19,Dirac particle in gravitational field,"Classical dynamics of spinning zero-size objects in an external gravitational
+field is derived from the conservation law of the stress-energy and spin
+tensors. The resulting world line equations differ from those in the existing
+literature. In particular, the spin of the Dirac particle does not couple to
+the background curvature. As a check of consistency, the wave packet solution
+of the free Dirac equation is considered. The resulting equations are shown to
+include a constraint that relates the wave packet spin to its orbital angular
+momentum. In the zero-size limit, both contributions to the total angular
+momentum disappear simultaneously.",0806.3228v1
+2008-11-19,Excitation of spin waves on a cylindrical semiconductor heterostructure with Rashba spin-orbit interaction,"Elementary excitations in a paramagnetic semiconductor quantum well confined
+to a cylindrical surface are theoretically studied on the basis of coupled
+spin-charge drift-diffusion equations. The electric-field-mediated eigenmodes
+are optically excited by an oscillating interference pattern, which induces a
+current in the outer circuit. For a cylinder with a given radius, sharp
+resonances are predicted to occur in the steady-state current response, which
+are due to weakly damped spin remagnetization waves.",0811.3070v1
+2010-03-08,Theory of Spin-Dependent Phonon-Assisted Optical Transitions in Silicon,"A theory for the relation between the spin polarization and luminescence in
+silicon is presented. The theory provides intuitive relations for
+phonon-assisted optical transitions between the conduction and valence band
+edges. It is shown that an opposite behavior of longitudinal and transverse
+optical phonon-assisted transitions is responsible to recent experimental
+results of spin injection into silicon. The effects of spin-orbit coupling and
+doping are studied in detail.",1003.1709v2
+2010-09-28,Effects of mechanical rotation on spin currents,"We study the Pauli--Schr\""odinger equation in a uniformly rotating frame of
+reference to describe a coupling of spins and mechanical rotations. The
+explicit form of the spin-orbit interaction (SOI) with the inertial effects due
+to the mechanical rotation is presented. We derive equations of motion for a
+wavepacket of electrons in two-dimensional planes subject to the SOI. The
+solution is a superposition of two cyclotron motions with different frequencies
+and a circular spin current is created by the mechanical rotation.",1009.5424v2
+2011-06-03,Effective transition operators for resonant inelastic X-ray scattering,"Effective symmetry-based transition operators for resonant inelastic X-ray
+scattering (RIXS) are derived that show how the scattering between different
+states depends on the polarization of the incoming and outgoing X-rays. In
+spherical symmetry, the effective operators can be rewritten in terms of spin
+operators, although the expressions depend on the nature of the ground state.
+For lower symmetries, the combined action of the crystal field and the
+spin-orbit interaction breaks up the spin space and spin operators are no
+longer appropiate operators. By taking iridium compounds as an example, it is
+demonstrated that effective scattering operators can still be obtained. These
+effective transition operators facilitate our understanding how RIXS couples to
+elementary excitations.",1106.0640v1
+2011-12-20,Decoherence-avoiding spin qubits in optically active quantum dot molecules,"In semiconductors, the T2* coherence time of a single confined spin is
+limited either by the fluctuating magnetic environment (via the hyperfine
+interaction), or by charge fluctuations (via the spin-orbit interaction). We
+demonstrate that both limitations can be overcome simultaneously by using two
+exchange-coupled electron spins that realize a single decoherence-avoiding
+qubit. Using coherent population trapping, we generate a coherent superposition
+of the singlet and triplet states of an optically active quantum-dot molecule,
+and show that the corresponding T2* may exceed 200 nanoseconds.",1112.4710v2
+2012-03-30,Approximate spin and pseudospin solutions of the Dirac equation for the inversely quadratic Yukawa potential and tensor interaction,"We approximately solve the Dirac equation for the inversely quadratic Yukawa
+(IQY) potential including a Coulomb-like tensor potential with arbitrary
+spin-orbit coupling quantum number . In the framework of the spin and
+pseudospin (pspin) symmetry, we obtain the energy eigenvalue equation and the
+corresponding eigenfunctions in closed form by using the Nikiforov-Uvarov
+method. The numerical results show that the Coulomb-like tensor interaction
+removes degeneracies between spin and pspin state doublets.",1203.6769v1
+2012-06-14,DFT Calculations as a Tool to Analyse Quadrupole Splittings of Spin Crossover Fe(II) complexes,"Density functional methods have been applied to calculate the quadrupole
+splitting of a series of iron(II) spin crossover complexes. Experimental and
+calculated values are in reasonable agreement. In one case spin-orbit coupling
+is necessary to explain the very small quadrupole splitting value of 0.77 mm/s
+at 293 K for a high-spin isomer.",1206.3036v1
+2013-04-24,Antiferromagnetic crystalline topological insulators,"The gapless surface Dirac cone of time reversal invariant topological
+insulators is protected by time reversal symmetry due to the Kramers' theorem.
+Spin degree of freedom is usually required since Kramers' theorem only
+guarantees double degeneracy for spinful fermions, but not for spinless
+fermions. In this paper, we present an antiferromagnetic spinless model, which
+breaks time reversal symmetry. Similar to time reversal invariant topological
+insulators, this model possesses a topologically non-trivial phase with a
+single surface Dirac cone, which is protected by the combination of time
+reversal and translation operation. Our results show that in magnetic crystals,
+a single Dirac cone can exist on the surface even without any spin degree of
+freedom and spin-orbit coupling.",1304.6455v1
+2013-06-10,Spin Transfer of Quantum Information between Majorana Modes and a Resonator,"We show that resonant coupling and entanglement between a mechanical
+resonator and majorana bound states can be achieved via spin currents in a 1D
+quantum wire with strong spin-orbit interactions. The bound states induced by
+vibrating and stationary magnets can hybridize thus resulting in spin-current
+induced $4\pi$-periodic torque, as a function of the relative field angle,
+acting on the resonator. We study the feasibility of detecting and manipulating
+majorana bound states with the use of magnetic resonance force microscopy
+techniques.",1306.2339v1
+2013-07-30,Spin-dependent shot noise enhancement in a quantum dot,"The spin-dependent dynamical blockade was investigated in a lateral quantum
+dot in a magnetic field. Spin-polarized edge channels in the two-dimensional
+leads and the spatial distribution of Landau orbitals in the dot modulate the
+tunnel coupling of the quantum dot level spectrum. In a measurement of the
+electron shot noise we observe a pattern of super-Poissonian noise which is
+correlated to the spin-dependent competition between different transport
+channels.",1307.8165v1
+2014-08-09,Spin-valley relaxation and quantum transport regimes in two-dimensional transition metal dichalcogenides,"Quantum transport and spintronics regimes are studied in p- and n-doped
+atomic layers of hexagonal transition metal dichalcogenides (TMDCs), subject to
+the interplay between the valley structure and spin-orbit coupling. We find how
+spin relaxation of carriers depends on their areal density and show that it
+vanishes for holes near the band edge, leading to the density-independent spin
+diffusion length, and we develop a theory of weak
+localisation/antilocalisation, describing the crossovers between the
+orthogonal, double-unitary and symplectic regimes of quantum transport in
+TMDCs.",1408.2121v2
+2014-11-10,Classical and quantum chaotic angular-momentum pumps,"We study directed transport of charge and intrinsic angular momentum by
+periodically driven scattering in the regime of fast and strong driving. A
+spin-orbit coupling through a kicked magnetic field confined to a compact
+region in space leads to irregular scattering and triggers spin flips in a
+spatially asymmetric manner which allows to generate polarized currents. The
+dynamical mechanisms responsible for the spin separation carry over to the
+quantum level and give rise to spin pumping. Our theory, based on the Floquet
+formalism, is confirmed by numerical solutions of the time-dependent
+inhomogeneous Schr\""{o}dinger equation with a continuous source term.",1411.2659v2
+2014-12-28,Majorana Edge States and Braiding in an Exactly Solvable One-dimensional Spin Model,"We derive an exactly solvable one-dimensional (1D) spin model from the
+three-band Hubbard model with a strong spin-orbit coupling by introducing U(1)
+gauge fields to the isospin states. We find that it has a topological
+nontrivial phase characterized by Majorana end modes which are protected by a
+new Z_2 topological invariant related to the parity of the lattice sites (odd
+or even number of sites) in the spin chain. With the protection of this Z_2
+topological invariant, a novel braiding of two Majorana edge states in this
+strictly geometric 1D chain is realized. We also discuss the possible
+realization of the gauge fields.",1412.8183v1
+2016-07-24,Consequences of the thermal dependence of spin orbit coupling in semiconductors,"The $\vec{k}.\vec{p}$ perturbation theory in semiconductor modifies some spin
+related parameters of the semi-conducting system. Furthermore, renormalization
+of the Kane model parameters occurs when temperature appears in the scenario.
+In this paper, we have analysed the consequences of this renormalized Kane
+parameters on some spin transport issues. It is noteworthy to study that the
+temperature corrected scenario, explained here can open up a new direction
+towards the spin calorimetric applications in semiconductors.",1607.07026v1
+2017-03-10,A microscopic formulation of dynamical spin injection in ferromagnetic-nonmagnetic heterostructures,"We develop a microscopic formulation of dynamical spin injection in
+heterostructure comprising nonmagnetic metals in contact with ferromagnets. The
+spin pumping current is expressed in terms of Green's function of the
+nonmagnetic metal attached to the ferromagnet where a precessing magnetization
+is induced. The formulation allows for the inclusion of spin-orbit coupling and
+disorder. The Green's functions involved in the expression for the current are
+expressed in real-space lattice coordinates and can thus be efficiently
+computed using recursive methods.",1703.03775v2
+2013-09-07,Fast spin control in a two-electron double quantum dot by dynamical invariants,"Inverse engineering of electric fields has been recently proposed to achieve
+fast and robust spin control in a single-electron quantum dot with spin-orbit
+coupling. In this paper we design, by inverse engineering based on
+Lewis-Riesenfeld invariants, time-dependent electric fields to realize fast
+transitions in the selected singlet-triplet subspace of a two-electron double
+quantum dot. We apply two-mode driving schemes, directly employing the
+Lewis-Riesenfeld phases, to minimize the electric field necessary to design
+flexible protocols and perform spin manipulation on the chosen timescale.",1309.1916v1
+2015-12-11,Electrically controlled spin-transistor operation in helical magnetic field,"A proposal of electrically controlled spin transistor in helical magnetic
+field is presented. In the proposed device, the transistor action is driven by
+the Landau-Zener transitions that lead to a backscattering of spin polarized
+electrons and switching the transistor into the high-resistance state (off
+state). The on/off state of the transistor can be controlled by the
+all-electric means using Rashba spin-orbit coupling that can be tuned by the
+voltages applied to the side electrodes.",1512.03653v1
+2015-12-18,Origin of Lattice Spin in Graphitic Systems,"Lattice spin, in planar condensed matter system with emergent Dirac
+dispersion, is shown to emerge from the inherent SU(2) symmetry, arising
+through Schwingers angular momentum construction from anti-commuting Heisenberg
+operators of the sub-lattices. The presence of a mass term in the emergent
+Dirac dispersion is essential for the existence of this spin. The usual hopping
+term, that entangles the two sub-lattices, leads to the orbital counterpart.
+Relative sub-lattice displacements, that couple to the effective Dirac fermions
+like U(1) gauge fields, do not effect the lattice spin.",1512.06037v1
+2019-09-03,Quasiclassical expressions for the free energy of superconducting systems,"In the seminal work by G. Eilenberger [Z. Phys. 214, 195 (1968)], the
+quasiclassical expression for the free energy of spin-singlet superconductor
+has been suggested. Starting from the Luttinger-Ward formulation we derive the
+Eilenberger free energy and find its generalization for superconductor or
+superfluid with spin-triplet correlations. Besides ordinary superconductors
+with various scattering mechanisms, the obtained free energy functional can be
+used for systems with spin-triplet pairing such as superfluid $^3$He and
+superconducting systems with spatially-inhomogeneous exchange field or
+spin-orbit coupling. Using this general result we derive the simplified
+expression for the free energy in the diffusive limit in terms of the
+momentum-averaged propagators.",1909.00992v1
+2018-03-15,Non-centrosymmetric superconductors on honeycomb lattice,"We study non-centrosymmetric topological superconductivity in correlated
+doped quantum spin-Hall insulators (QSHI) on honeycomb lattice without
+inversion symmetry where the intrinsic (Kane-Mele) and Rashba spin-orbit
+couplings can in general exist. We explore the generic topologically
+non-trivial superconducting phase diagram of the model system. Over a certain
+parameter space, the parity-mixing superconducting state with co-existing
+spin-singlet $d$+$id$ and spin-triplet $p$+$ip$-wave pairing is found. On a
+zigzag nanoribbon, the parity-mixing superconducting state shows co-existing
+helical and chiral Majorana fermions at edges. Relevance of our results for
+experiments is discussed.",1803.05751v1
+2019-04-10,Spin-momentum locking and Majorana fermions in charge carrier hole epitaxial wires,"Epitaxial semiconductor nanowires with charge carrier holes can exhibit an
+infinite mass of holes and spin-locking due to chiral spectrum linear in
+momentum and spin. The criterion for emergence of topological superconductivity
+and Majorana fermions in these wires coupled to an s-type superconductors is
+the same as in topological insulators, and opposite to the criterion of onset
+of Majorana modes in quantum wires with parabolic spectrum in the presence of
+spin-orbit interactions.",1904.05088v2
+2020-11-20,Presence of x-ray magnetic circular dichroism effect for zero-magnetization state in antiferromagnetism,"X-ray magnetic circular dichroism (XMCD) is generally not observed for
+antiferromagnetic (AFM) states because XMCD signals from the antiparallelly
+coupled spins cancel each other. In this letter, we theoretically show the
+presence of an XMCD signal from compensated two-dimensional triangle AFM
+structures on a Kagome lattice. The calculation reveals the complete
+correspondence between the XMCD spectra and the sign of the spin chirality: the
+XMCD signal only appears when the spin chirality is negative. This XMCD signal
+originates from the different absorption coefficients of the three sublattices
+reflecting different charge density anisotropies and directions of spin and
+orbital magnetic moments.",2011.12773v1
+2021-04-26,Hyperfine Structure of Transition Metal Defects in SiC,"Transition metal (TM) defects in silicon carbide (SiC) are a promising
+platform in quantum technology, especially because some TM defects emit in the
+telecom band. We develop a theory for the interaction of an active electron in
+the $D$-shell of a TM defect in SiC with the TM nuclear spin and derive the
+effective hyperfine tensor within the Kramers doublets formed by the spin-orbit
+coupling. Based on our theory we discuss the possibility to exchange the
+nuclear and electron states with potential applications for nuclear spin
+manipulation and long-lived nunclear-spin based quantum memories.",2104.12351v1
+2020-03-04,Crossover of spin Hall to quantum anomalous Hall effect in PbC/MnSe heterostructures,"In this paper, we study topological properties and Hall conductivities in
+PbC/MnSe heterostructure under the illumination of a circularly polarized
+light. At high frequency regime, energy gap, Chern numbers, and Hall
+conductivities are studied based on the Floquet theory and Green's function
+formalism, respectively. The interplay between spin orbit coupling and light
+leads to topological phase transition between anomalous Hall states and spin
+Hall states, which is related to the emission and absorption of two virtual
+photons. The anomalous Hall conductivities are dependent on polarization of
+light, while the spin Hall conductivity is independent.",2003.02072v1
+2023-10-27,Resilient Intraparticle Entanglement and its Manifestation in Spin Dynamics of Disordered Dirac Matter,"Topological quantum matter exhibits novel transport phenomena driven by
+entanglement between internal degrees of freedom, as for instance generated by
+spin-orbit coupling effects. Here we report on a direct connection between the
+mechanism driving spin relaxation and the intertwined dynamics between spin and
+sublattice degrees of freedom in disordered graphene. Beyond having a direct
+observable consequence, such intraparticle entanglement is shown to be
+resilient to disorder, pointing towards a novel resource for quantum
+information processing.",2310.17950v1
+2023-12-22,Hyperbolic Spin Waves in Magnetic Polar Metals,"We demonstrate the emergence of collective spin modes with hyperbolic
+dispersion in three-dimensional spin-orbit coupled polar metals magnetized by
+intrinsic ordering or applied fields. These particle-hole bound states exist
+for arbitrarily weak repulsive interactions; they are optically accessible and
+can be used to generate pure spin current when magnetization is tilted away
+from the polar axis. We suggest material hosts for these excitations and
+discuss their potential relevance to nanoscale spintronic and polaritonic
+applications.",2312.14377v2
+2015-06-22,All-electric all-semiconductor spin field effect transistors,"The spin field effect transistor envisioned by Datta and Das opens a gateway
+to spin information processing. Although the coherent manipulation of electron
+spins in semiconductors is now possible, the realization of a functional spin
+field effect transistor for information processing has yet to be achieved,
+owing to several fundamental challenges such as the low spin-injection
+efficiency due to resistance mismatch, spin relaxation, and the spread of spin
+precession angles. Alternative spin transistor designs have therefore been
+proposed, but these differ from the field effect transistor concept and require
+the use of optical or magnetic elements, which pose difficulties for the
+incorporation into integrated circuits. Here, we present an all-electric and
+all-semiconductor spin field effect transistor, in which these obstacles are
+overcome by employing two quantum point contacts as spin injectors and
+detectors. Distinct engineering architectures of spin-orbit coupling are
+exploited for the quantum point contacts and the central semiconductor channel
+to achieve complete control of the electron spins -- spin injection,
+manipulation, and detection -- in a purely electrical manner. Such a device is
+compatible with large-scale integration and hold promise for future spintronic
+devices for information processing.",1506.06507v1
+2019-07-07,"Spin-1 Dirac half-metal, spin-gapless semiconductor, and spin-polarized massive Dirac dispersion in transition metal dihalide monolayers","Spin-1 condensed matter systems characterized by the combination of a
+Dirac-like dispersion and flat bands are ideal for realizing high-temperature
+electronics and spintronic technologies in the absence of external magnetic
+field. In this study, we propose a three-band tight binding model, with
+spin-polarized Haldane-like next-nearest-neighbour tunnelling, on dice lattice
+and show that spin-1 Dirac half-metal, spin-1 Dirac spin-gapless semiconductor,
+and spin-polarized spin-1 massive Dirac dispersion with nontrivial topology can
+exist in two-dimensional ferromagnetic condensed matter systems with electron
+spin polarization P = 1. The proposed spin-polarized spin-1 phases can be
+realized in ferromagnetic transition metal dihalides MX2 monolayers
+effectively. By using first principle calculations, we show that a small
+compressive strain leads MX2 monolayers to be spin-one Dirac half-metal for M =
+Fe and X = Br, Cl while spin-one Dirac spin-gapless semiconductor for M = Co
+and X = Br, Cl. Spin-one Dirac spin-gapless semiconductors CoBr2 and CoCl2
+embeds flat band ferromagnetism where spin-orbit coupling opens a topologically
+non-trivial Dirac gap between dispersing valance and conduction band while
+leaving flat band unaffected. The intrinsic flat-band ferromagnetism in
+spin-polarized spin-1 massive Dirac dispersion plays key role in materializing
+quantum anomalous Hall state with Chern number C = -2.",1907.07756v1
+2020-01-14,Spin splitting with persistent spin textures induced by the line defect in 1T-phase of monolayer transition metal dichalcogenides,"The spin splitting driven by spin-orbit coupling in monolayer (ML) transition
+metal dichalcogenides (TMDCs) family has been widely studied only for the
+1H-phase structure, while it is not profound for the 1T-phase structure due to
+the centrosymmetric of the crystal. Based on first-principles calculations, we
+show that significant spin splitting can be induced in the ML 1T-TMDCs by
+introducing the line defect. Taking the ML PtSe2 as a representative example,
+we considered the most stable form of the line defects, namely Se-vacancy line
+defect (Se-VLD). We find that large spin splitting is observed in the defect
+states of the Se-VLD, exhibiting a highly unidirectional spin configuration in
+the momentum space. This peculiar spin configuration may yield the so-called
+persistent spin textures (PST), a specific spin structure resulting in
+protection against spin-decoherence and supporting an extraordinarily long spin
+lifetime. Moreover, by using k.p perturbation theory supplemented with symmetry
+analysis, we clarified that the emerging of the spin splitting maintaining the
+PST in the defect states is originated from the inversion symmetry breaking
+together with one-dimensional nature of the Se-VLD engineered ML PtSe2. Our
+findings pave a possible way to induce the significant spin splitting in the ML
+1T-TMDCs, which could be highly important for designing spintronic devices.",2001.04613v2
+2019-08-21,Ordering phenomena of spin trimers accompanied by large geometrical Hall effect,"The wavefuntion of conduction electrons moving in the background of a
+non-coplanar spin structure can gain a quantal phase - Berry phase - as if the
+electrons were moving in a strong fictitious magnetic field. Such an emergent
+magnetic field effect is approximately proportional to the solid angle
+subtended by the spin moments on three neighbouring spin sites, termed the
+scalar spin chirality. The entire spin chirality of the crystal, unless
+macroscopically canceled, causes the geometrical Hall effect of real-space
+Berry-phase origin, whereas the intrinsic anomalous Hall effect (AHE) in a
+conventional metallic ferromagnet is of the momentum-space Berry-phase origin
+induced by relativistic spin-orbit coupling (SOC). Here, we report the ordering
+phenomena of the spin-trimer scalar spin chirality and the consequent large
+geometrical Hall effect in the breathing kagom\'e lattice compound
+Dy$_3$Ru$_4$Al$_{12}$, where the Dy$^{3+}$ moments form non-coplanar spin
+trimers with local spin chirality. Using neutron diffraction, we show that the
+local spin chirality of the spin trimers as well as its ferroic/antiferroic
+orders can be switched by an external magnetic field, accompanying large
+changes in the geometrical Hall effect. Our finding reveals that systems
+composed of tunable spin trimers can be a fertile field to explore large
+emergent electromagnetic responses arising from real-space topological magnetic
+orders.",1908.07728v1
+2018-10-30,Room temperature spin Hall effect in graphene/MoS$_2$ van der Waals heterostructures,"Graphene is an excellent material for long distance spin transport but allows
+little spin manipulation. Transition metal dichalcogenides imprint their strong
+spin-orbit coupling into graphene via proximity effect, and it has been
+predicted that efficient spin-to-charge conversion due to spin Hall and
+Rashba-Edelstein effects could be achieved. Here, by combining Hall probes with
+ferromagnetic electrodes, we unambiguously demonstrate experimentally spin Hall
+effect in graphene induced by MoS$_2$ proximity and for varying temperature up
+to room temperature. The fact that spin transport and spin Hall effect occur in
+different parts of the same material gives rise to a hitherto unreported
+efficiency for the spin-to-charge voltage output. Remarkably for a single
+graphene/MoS$_2$ heterostructure-based device, we evidence a superimposed
+spin-to-charge current conversion that can be indistinguishably associated with
+either the proximity-induced Rashba-Edelstein effect in graphene or the spin
+Hall effect in MoS$_2$. By comparing our results to theoretical calculations,
+the latter scenario is found the most plausible one. Our findings pave the way
+towards the combination of spin information transport and spin-to-charge
+conversion in two-dimensional materials, opening exciting opportunities in a
+variety of future spintronic applications.",1810.12481v1
+2021-02-06,Spin pumping and inverse spin Hall effect in CoFeB/IrMn heterostructures,"High spin to charge conversion efficiency is the requirement for the
+spintronics devices which is governed by spin pumping and inverse spin Hall
+effect (ISHE). In last one decade, ISHE and spin pumping are heavily
+investigated in ferromagnet/ heavy metal (HM) heterostructures. Recently
+antiferromagnetic (AFM) materials are found to be good replacement of HMs
+because AFMs exhibit terahertz spin dynamics, high spin-orbit coupling, and
+absence of stray field. In this context we have performed the ISHE in CoFeB/
+IrMn heterostructures. Spin pumping study is carried out for
+$Co_{40}Fe_{40}B_{20} (12\ nm)/ Cu (3\ nm)/ Ir_{50}Mn_{50} (t\ nm)/ AlO_{x} (3\
+nm)$ samples where \textit{t} value varies from 0 to 10 nm. Damping of all the
+samples are higher than the single layer CoFeB which indicates that spin
+pumping due to IrMn is the underneath mechanism. Further the spin pumping in
+the samples are confirmed by angle dependent ISHE measurements. We have also
+disentangled other spin rectifications effects and found that the spin pumping
+is dominant in all the samples. From the ISHE analysis the real part of spin
+mixing conductance (\textit{$g_{r}^{\uparrow \downarrow}$}) is found to be
+0.704 $\pm$ 0.003 $\times$ $10^{18}$ $m^{-2}$.",2102.03624v2
+2023-10-23,Microscopic theory of spin Seebeck effect in antiferromagnets,"We develop a microscopic theory for the spin Seebeck effect (SSE) in N\'eel
+and canted phases of antiferromagnetic insulators. We calculate the DC spin
+current tunneling from the antiferromagnet to an attached metal, incorporating
+the spin-wave theory and the non-equilibrium Green's function approach. Our
+result shows a sign change of the spin current at the spin-flop phase
+transition between N\'eel and canted phases, which is in agreement with a
+recent experiment for the SSE of $\rm Cr_2O_3$ in a semi-quantitative level.
+The sign change can be interpreted from the argument based on the density of
+states of up- and down-spin magnons, which is related to the polarized-neutron
+scattering spectra. The theory also demonstrates that the spin current in the
+N\'eel phase is governed by the magnon correlation, while that in the canted
+phase consists of two parts: Contributions from not only the magnon dynamics
+but also the static transverse magnetization. This result leads to a prediction
+that at sufficiently low temperatures, the spin current non-monotonically
+changes as a function of magnetic field in the canted phase. Towards a more
+unified understanding of the SSE in antiferromagnets, we further discuss some
+missing links of theories of SSE: Interface properties, effects of the
+transverse spin moment in the canted phase, the spin-orbit coupling in the
+metal, etc. Finally, we compare the SSE of antiferromagnets with those of
+different magnetic phases such as ferromagnets, ferrimagnets, an
+one-dimensional spin liquid, a spin-nematic liquid, and a spin-Peierls
+(dimerized) phase.",2310.15292v2
+2003-02-14,Microscopic Identification of the D-vector in Triplet Superconductor Sr_2RuO_4,"Triplet superconductivity in Sr_2RuO_4 is investigated with main interest on
+its internal degree of freedom. We perform a microscopic calculation to
+investigate how the chiral state d(k) = (k_x \pm ik_y)z is realized among the
+underlying six degenerate states. Starting from the three band Hubbard model
+with spin-orbit interaction, we use a perturbation theory in order to calculate
+the pairing interaction. The p-wave superconductivity with T_c \sim 1.5K is
+obtained in the moderately weak coupling region. It is shown that the orbital
+dependent superconductivity (ODS) robustly appears in Sr_2RuO_4. We determine
+the stabilized state by solving the Eliashberg equations. It is found that the
+Hund coupling term as well as the spin-orbit interaction is necessary for the
+``symmetry breaking interaction''. The main result is that the chiral state is
+stabilized in case of the p-wave symmetry with the main \gamma-band, which is
+obtained in the perturbation theory. When we assume the other pairing symmetry
+including the f-wave state, the symmetry breaking interaction gives the other
+D-vector. The electronic structure constructed from the t_2g-orbitals is
+essential for this result.",0302299v1
+2004-06-21,"Orbital ordering and one-dimensional magnetic correlation in vanadium spinel oxides AV2O4 (A = Zn, Mg, or Cd)","We present our theoretical results on the mechanism of two transitions in
+vanadium spinel oxides $A$V$_2$O$_4$ ($A$=Zn, Mg, or Cd) in which magnetic V
+cations constitute a geometrically-frustrated pyrochlore structure. We have
+derived an effective spin-orbital-lattice coupled model in the strong
+correlation limit of the multiorbital Hubbard model, and applied Monte Carlo
+simulation to the model. The results reveal that the higher-temperature
+transition is a layered antiferro-type orbital ordering accompanied by
+tetragonal Jahn-Teller distortion, and the lower-temperature transition is an
+antiferromagnetic spin ordering. The orbital order lifts the magnetic
+frustration partially, and induces spatial anisotropy in magnetic exchange
+interactions. In the intermediate phase, the system can be considered to
+consist of weakly-coupled antiferromagnetic chains lying in the perpendicular
+planes to the tetragonal distortion.",0406462v1
+2008-04-18,Antibonding ground states in semiconductor artificial molecules,"The spin-orbit interaction is a crucial element of many semiconductor
+spintronic technologies. Here we report the first experimental observation, by
+magneto-optical spectroscopy, of a remarkable consequence of the spin-orbit
+interaction for holes confined in the molecular states of coupled quantum dots.
+As the thickness of the barrier separating two coupled quantum dots is
+increased, the molecular ground state changes character from a bonding orbital
+to an antibonding orbital. This result is counterintuitive, and antibonding
+molecular ground states are never observed in natural diatomic molecules. We
+explain the origin of the reversal using a four band k.p model that has been
+validated by numerical calculations that account for strain. The discovery of
+antibonding molecular ground states provides new opportunities for the design
+of artificially structured materials with complex molecular properties that
+cannot be achieved in natural systems.",0804.3097v1
+2010-09-22,Local symmetry and magnetic anisotropy in multiferroic MnWO4 and antiferromagnetic CoWO4 studied by soft x-ray absorption spectroscopy,"Soft x-ray absorption experiments on the transition metal L2,3 edge of
+multiferroic MnWO4 and antiferromagnetic CoWO4 are presented. The observed
+linear polarization dependence, analyzed by full-multiplet calculations, is
+used to determine the ground state wave function of the magnetic Mn2+ and Co2+
+ions. The impact of the local structure and the spin-orbit coupling on the
+orbital moment is discussed in terms of the single-ion anisotropy. It is shown
+that the orbital moment in CoWO4 is responsible for the collinear
+antiferromagnetism, while the small size of spin-orbit coupling effects make
+spiral magnetic order in MnWO4 possible, enabling the material to be
+multiferroic.",1009.4338v1
+2012-06-30,Microscopic Theory of Rashba Interaction in Magnetic Metal,"Theory of Rashba spin-orbit coupling in magnetic metals is worked out from
+microscopic Hamiltonian describing d-orbitals. When structural inversion
+symmetry is broken, electron hopping between $d$-orbitals generates chiral
+ordering of orbital angular momentum, which combines with atomic spin-orbit
+coupling to result in the Rashba interaction. Rashba parameter characterizing
+the interaction is band-specific, even reversing its sign from band to band.
+Large enhancement of the Rashba parameter found in recent experiments is
+attributed to the orbital mixing of 3d magnetic atoms with non-magnetic heavy
+elements as we demonstrate by first-principles and tight-binding calculations.",1207.0089v1
+2017-03-01,Topological Fulde-Ferrell states in alkaline-earth-metal-like atoms near an orbital Feshbach resonance,"We study the effects of synthetic spin-orbit coupling on the pairing physics
+in quasi-one-dimensional ultracold Fermi gases of alkaline-earth-metal-like
+atoms near an orbital Feshbach resonance (OFR). The interplay between
+spin-orbit coupling and pairing interactions near the OFR leads to an
+interesting topological Fulde-Ferrell state, where the nontrivial topology of
+the state is solely encoded in the closed channel with a topologically trivial
+Fulde-Ferrell pairing in the open channel. We confirm the topological property
+of the system by characterizing the Zak phase and the edge states. The
+topological Fulde-Ferrell state can be identified by the momentum-space density
+distribution obtained from time-of-flight images.",1703.00138v2
+2014-05-12,Multiple lattice instabilities resolved by magnetic-field and disorder sensitivities in cubic paramagnetic phase of the orbital-degenerate frustrated spinel MgV$_2$O$_4$,"Ultrasound velocity measurements of the orbital-degenerate frustrated spinel
+MgV$_2$O$_4$ are performed in the high-purity single crystal which exhibits
+successive structural and antiferromagnetic phase transitions, and in the
+disorder-introduced single crystal which exhibits spin-glass-like behavior. The
+measurements reveal that two-types of unusual temperature dependence of the
+elastic moduli coexist in the cubic paramagnetic phase, which are resolved by
+magnetic-field and disorder sensitivities: huge Curie-type softening with
+decreasing temperature, and concave temperature dependence with a
+characteristic minimum. These elastic anomalies suggest the coupling of lattice
+to coexisting orbital fluctuations and orbital-spin-coupled excitations.",1405.2802v1
+2015-12-22,(C$_{4}$H$_{12}$N$_{2}$)[CoCl$_{4}$] -tetrahedrally coordinated Co$^{2+}$ without the orbital degeneracy,"We report on the synthesis, crystal structure, and magnetic properties of a
+previously unreported Co$^{2+}$ $S={3 \over 2}$ compound,
+(C$_{4}$H$_{12}$N$_{2}$)[CoCl$_{4}$], based upon a tetrahedral crystalline
+environment. The $S={3 \over 2}$ magnetic ground state of Co$^{2+}$, measured
+with magnetization, implies an absence of spin-orbit coupling and orbital
+degeneracy. This contrasts with compounds based upon an octrahedral and even
+known tetrahedral Co$^{2+}$ based systems where a sizable spin-orbit coupling
+is measured. The compound is characterized with single crystal x-ray
+diffraction, magnetic susceptibility, infrared, and ultraviolet/visible
+spectroscopy. Magnetic susceptibility measurements find no magnetic ordering
+above 2 K. The results are also compared with the previously known monoclinic
+hydrated analogue.",1512.07124v1
+2014-06-15,Dynamical topological phases in quenched spin-orbit coupled degenerate Fermi gas,"The spin-orbit coupled degenerate Fermi gas provides a totally new platform
+to realize topological superfluids and related topological excitations.
+Previous studies have mainly focused on the properties of the ground state.
+Here we consider a two-dimensional Fermi gas with Rashba spin-orbit coupling
+subject to a perpendicular Zeeman field. For this system, we have found that
+its ground state topological structure is captured by the spin texture, which
+is readily measurable in experiments. We show that, when the Zeeman field is
+suddenly quenched, dynamical topological phases can be realized. More
+specifically, three post-quench dynamical phases can be identified according to
+the asymptotic behavior of the order parameter. In the undamped phase, a
+persistent oscillation of the order parameter may support a topological Floquet
+state with multiple edge states. In the Landau damped phase, the magnitude of
+the order parameter approaches a constant via a power-law decay, and this
+system can support a dynamical topological phase with a pair of edge states at
+the boundary. In the over-damped phase, the order parameter decays to zero
+exponentially although the condensate fraction remains finite. These
+predictions can be observed in the strong coupling regime of ultracold Fermi
+gas.",1406.3821v2
+2021-03-08,Kondo effect and spin-orbit coupling in graphene quantum dots,"The Kondo effect is a cornerstone in the study of strongly correlated
+fermions. The coherent exchange coupling of conduction electrons to local
+magnetic moments gives rise to a Kondo cloud that screens the impurity spin.
+Whereas complete Kondo screening has been explored widely, realizations of the
+underscreened scenario - where only some of several Kondo channels participate
+in the screening - remain rare. Here we report the observation of fully
+screened and underscreened Kondo effects in quantum dots in bilayer graphene.
+More generally, we introduce a unique platform for studying Kondo physics. In
+contrast to carbon nanotubes, whose curved surfaces give rise to strong
+spin-orbit coupling breaking the SU(4) symmetry of the electronic states
+relevant for the Kondo effect, we study a nominally flat carbon material with
+small spin-orbit coupling. Moreover, the unusual two-electron triplet ground
+state in bilayer graphene dots provides a route to exploring the underscreened
+spin-1 Kondo effect.",2103.04864v1
+2021-10-06,Anomalously small superconducting gap in the strong spin-orbit coupled superconductor: $ β- $Tungsten,"Thin films of $ \beta- $tungsten host superconductivity in the presence of
+strong spin-orbit coupling. This non-equilibrium crystalline phase of tungsten
+has attracted considerable attention in recent years due to its giant spin Hall
+effect and the potential promise of exotic superconductivity. However, more
+than 60 years after its discovery, superconductivity in this material is still
+not well understood. Using time-domain THz spectroscopy, we measure the
+frequency response of the complex optical conductivity of $ \beta- $tungsten
+thin film with a T$_c$ of 3.7 K in its superconducting state. At temperatures
+down to 1.6 K, we find that both the superconducting gap and the superfluid
+spectral weight are much smaller than that expected for a weakly coupled
+superconductor given the T$_c$. The conclusion of a small gap holds up even
+when accounting for possible inhomogeneities in the system, which could come
+from other crystalline forms of tungsten (that are not superconducting at these
+temperatures) or surface states on $ \beta- $tungsten grains. Using detailed
+X-ray diffraction measurements, we preclude the possibility of significant
+amount of other tungsten allotropes, strongly suggesting the topological
+surface states of $ \beta- $tungsten play the role of inhomogeneity in these
+films. Our observations pose a challenge and opportunity for a theory of
+strongly anisotropic normal metals with strong spin-orbit coupling to describe.",2110.02464v1
+2007-09-10,Spin-gap behaviour in the 2-leg spin-ladder BiCu2PO6,"We present magnetic suscceptibility and heat capacity data on a new S=1/2
+two-leg spin ladder compound BiCu2PO6. From our susceptibility analysis, we
+find that the leg coupling J1/k_B is ~ 80 K and the ratio of the rung to leg
+coupling J2/J1 ~ 0.9. We present the magnetic contribution to the heat capacity
+of a two-leg ladder. The spin-gap Delta/k_B =3 4 K obtained from the heat
+capacity agrees very well with that obtained from the magnetic susceptibility.
+Significant inter-ladder coupling is suggested from the susceptibility
+analysis. The hopping integrals determined using Nth order muffin tin orbital
+(NMTO) based downfolding method lead to ratios of various exchange couplings in
+agreement with our experimental data. Based on our band structure analysis, we
+find the inter-ladder coupling in the bc-plane J2 to be about 0.75J1 placing
+the compound presumably close to the quantum critical limit.",0709.1338v1
+2017-06-28,Electric control of the edge magnetization in zigzag stanene nanoribbon,"There has been tremendous interest in manipulating electron and hole-spin
+states in low-dimensional structures for electronic and spintronic
+applications. We study the edge magnetic coupling and anisotropy in zigzag
+stanene nanoribbons, by first-principles calculations. Taking into account
+considerable spin-orbit coupling and ferromagnetism at each edge, zigzag
+stanene nanoribbon is insulating and its band gap depends on the inter-edge
+magnetic coupling and the magnetization direction. Especially for nanoribbon
+edges with out-of-plane antiferromagnetic coupling, two non-degenerate valleys
+of edge states emerge and the spin degeneracy is tunable by a transverse
+electric field, which give full play to spin and valley degrees of freedom.
+More importantly, both the magnetic order and anisotropy can be selectively
+controlled by electron and hole doping, demonstrating a readily accessible
+gate-induced modulation of magnetism. These intriguing features offer a
+practical avenue for designing energy-efficient devices based on multiple
+degrees of freedom of electron and magneto-electric couplings.",1706.09098v1
+2022-12-19,NaRuO$_2$: Kitaev-Heisenberg exchange in triangular-lattice setting,"Kitaev exchange, a new paradigm in quantum magnetism research, occurs for
+90$^{\circ}$ metal-ligand-metal links, $t_{2g}^5$ transition ions, and sizable
+spin-orbit coupling. It is being studied in honeycomb compounds but also on
+triangular lattices. While for the former it is known by now that the Kitaev
+intersite couplings are ferromagnetic, for the latter the situation is unclear.
+Here we pin down the exchange mechanisms and determine the effective coupling
+constants in the $t_{2g}^5$ triangular-lattice material NaRuO$_2$, recently
+found to host a quantum spin liquid ground state. We show that, compared to
+honeycomb compounds, the characteristic triangular-lattice cation surroundings
+dramatically affect exchange paths and effective coupling parameters, changing
+the Kitaev interactions to antiferromagnetic. The quantum chemical analysis and
+subsequent effective spin model computations provide perspective onto the
+nature of the experimentally observed quantum spin liquid -- it seemingly
+implies finite longer-range exchange, and the atypical proximity to
+ferromagnetic order is related to sizable ferromagnetic Heisenberg
+nearest-neighbor couplings.",2212.09365v2
+2005-03-04,Can the interface between a non-ideal ferromagnet and a semiconductor quantum wire acts as an ideal spin filter?,"The problem of spin injection across the interface between a non-ideal
+ferromagnet (less than 100% spin polarization) and a semiconductor
+(paramagnetic) quantum wire is examined in the presence of Rashba spin orbit
+coupling and an axial magnetic field along the wire axis. The field is caused
+by the ferromagnet magnetized along the wire axis. At low temperatures and for
+certain injection energies, the interface can act as an ideal spin filter
+allowing injection only from the majority spin band of the ferromagnet. Thus,
+100% spin filtering can take place even if the ferromagnet itself is less than
+100% spin polarized. Below a critical value of the magnetic field, there are
+two injection energies for which ideal (100%) spin filtering is possible; above
+this critical field, there is only one such injection energy.",0503112v1
+2005-06-27,Spin transverse force on spin current in an electric field,"As a relativistic quantum mechanical effect, it is shown that the electric
+field exerting a transverse force on an electron spin 1/2 only if the electron
+is moving and the spin is polarized along the electric field. The spin force,
+analogue to the Lorentz for on an electron charge in a magnetic field, is
+perpendicular to the electric field and the spin current polarized anong the
+electric field. This spin-dependent force can be used to understand the
+zitterbewegung of electron wave packet with spin-orbit coupling and is relevant
+to the generation of the charge Hall effect driven by the spin current in
+semiconductors.",0506676v2
+2006-03-01,Spin precession and alternating spin polarization in spin-3/2 hole systems,"The spin density matrix for spin-3/2 hole systems can be decomposed into a
+sequence of multipoles which has important higher-order contributions beyond
+the ones known for electron systems [R. Winkler, Phys. Rev. B \textbf{70},
+125301 (2004)]. We show here that the hole spin polarization and the
+higher-order multipoles can precess due to the spin-orbit coupling in the
+valence band, yet in the absence of external or effective magnetic fields. Hole
+spin precession is important in the context of spin relaxation and offers the
+possibility of new device applications. We discuss this precession in the
+context of recent experiments and suggest a related experimental setup in which
+hole spin precession gives rise to an alternating spin polarization.",0603025v2
+2006-12-08,Spin transport in Heisenberg antiferromagnets,"We analyze spin transport in insulating antiferromagnets described by the XXZ
+Heisenberg model in two and three dimensions. Spin currents can be generated by
+a magnetic-field gradient or, in systems with spin-orbit coupling,
+perpendicular to a time-dependent electric field. The Kubo formula for the
+longitudinal spin conductivity is derived analogously to the Kubo formula for
+the optical conductivity of electronic systems. The spin conductivity is
+calculated within interacting spin-wave theory. In the Ising regime, the XXZ
+magnet is a spin insulator. For the isotropic Heisenberg model, the
+dimensionality of the system plays a crucial role: In d=3 the regular part of
+the spin conductivity vanishes linearly in the zero frequency limit, whereas in
+d=2 it approaches a finite zero frequency value.",0612215v1
+2007-02-19,Spin relaxation times in disordered graphene,"We consider two mechanisms of spin relaxation in disordered graphene. i) Spin
+relaxation due to curvature spin orbit coupling caused by ripples. ii) Spin
+relaxation due to the interaction of the electronic spin with localized
+magnetic moments at the edges. We obtain analytical expressions for the spin
+relaxation times, tau_SO and tau_J due to both mechanisms and estimate their
+values for realistic parameters of graphene samples. We obtain that spin
+relaxation originating from these mechanisms is very weak and spin coherence is
+expected in disordered graphene up to samples of length L ~ 1 micron.",0702433v2
+2007-07-19,Spin injection and relaxation in a mesoscopic superconductor,"We study spin accumulation and spin relaxation in a superconducting nanowire.
+Spins are injected and detected by using a set of magnetic tunnel contact
+electrodes, closely spaced along the nanowire. We observe a giant enhancement
+of the spin accumulation of up to five orders of magnitude on transition into
+the superconducting state, consistent with the expected changes in the density
+of states. The spin relaxation length decreases by an order of magnitude from
+its value in the normal state. These measurements combined with our theoretical
+model, allow us to distinguish the individual spin flip mechanisms present in
+the transport channel. Our conclusion is that magnetic impurities rather than
+spin-orbit coupling dominate spin-flip scattering in the superconducting state.",0707.2879v3
+2008-04-14,Spin and Charge Shot Noise in Mesoscopic Spin Hall Systems,"Injection of unpolarized charge current through the longitudinal leads of a
+four-terminal two-dimensional electron gas with the Rashba spin-orbit (SO)
+coupling and/or SO scattering off extrinsic impurities is responsible not only
+for the pure spin Hall current in the transverse leads, but also for random
+time-dependent current fluctuations. We employ the scattering approach to
+current-current correlations in multiterminal nanoscale conductors to analyze
+the shot noise of transverse pure spin Hall and zero charge current, or
+transverse spin current and non-zero charge Hall current, driven by unpolarized
+or spin-polarized longitudinal current, respectively. Since any spin-flip acts
+as an additional source of noise, we argue that these shot noises offer a
+unique tool to differentiate between intrinsic and extrinsic SO mechanisms
+underlying the spin Hall effect in paramagnetic devices.",0804.2076v1
+2009-03-27,Comment on recent papers regarding next-to-leading order spin-spin effects in gravitational interaction,"It is argued that the tetrad in a recent paper by Porto and Rothstein on
+gravitational spin-spin coupling should not have the given form. The fixation
+of that tetrad was suggested by Steinhoff, Hergt, and Schaefer as a possible
+source for the disagreement found in the spin-squared dynamics. However, this
+inconsistency will only show up in the next-to-leading order spin-orbit
+dynamics and not in the spin-squared dynamics. Instead, the disagreement found
+at the next-to-leading order spin-squared level is due to a sign typo in the
+spin-squared paper by Porto and Rothstein.",0903.4772v2
+2009-05-18,Bulk Spin-Hall Effect,"We show that a two-dimensional spin-orbit-coupled system in the presence of a
+charge/spin-density wave with a wave-vector perpendicular to an applied
+electric field supports bulk manifestations of the direct/inverse spin-Hall
+effect. We develop a theory of this phenomenon in the framework of the spin
+diffusion equation formalism and show that, due to the inhomogeneity created by
+a spin-grating, an anomalous bulk charge-density wave is induced away from
+sample boundaries. The optimal conditions for the observation of the effect are
+determined. The main experimental manifestation of the bulk spin-Hall effect,
+the induced charge/spin-density-wave, is characterized by a pi/2-phase shift
+relative to the initial non-homogeneous spin/charge-polarization profile and
+has a non-monotonic time-varying amplitude.",0905.2771v1
+2010-10-29,Temperature and Electron Density Dependence of Spin Relaxation in GaAs/AlGaAs Quantum Well,"Temperature and carrier density dependent spin dynamics for GaAs/AlGaAs
+quantum wells (QWs) with different structural symmetry has been studied by
+using time-resolved Kerr rotation technique. The spin relaxation time is
+measured to be much longer for the symmetrically-designed GaAs quantum well
+comparing with the asymmetrical one, indicating the strong influence of Rashba
+spin-orbit coupling on spin relaxation. D'yakonov-Perel' (DP) mechanism has
+been revealed to be the dominant contribution for spin relaxation in
+GaAs/AlGaAs QWs. The spin relaxation time exhibits non-monotonic dependent
+behavior on both temperature and photo-excited carrier density, revealing the
+important role of non-monotonic temperature and density dependence of
+electron-electron Coulomb scattering. Our experimental observations demonstrate
+good agreement with recently developed spin relaxation theory based on
+microscopic kinetic spin Bloch equation approach.",1010.6144v1
+2010-11-10,Detection of spin injection into a double quantum dot: Violation of magnetic-field-inversion symmetry of nuclear polarization instabilities,"In mesoscopic systems with spin-orbit coupling, spin-injection into quantum
+dots at zero magnetic field is expected under a wide range of conditions.
+However, up to now, a viable approach for experimentally identifying such
+injection has been lacking. We show that electron spin injection into a
+spin-blockaded double quantum dot is dramatically manifested in the breaking of
+magnetic- field-inversion symmetry of nuclear polarization instabilities. Over
+a wide range of parameters, the asymmetry between positive and negative
+instability fields is extremely sensitive to the injected electron spin
+polarization and allows for the detection of even very weak spin injection.
+This phenomenon may be used to investigate the mechanisms of spin transport,
+and may hold implications for spin-based information processing.",1011.2247v1
+2010-11-20,Spin precession and modulation in ballistic cylindrical nanowires due to the Rashba effect,"The spin precession in a cylindrical semiconductor nanowire due to Rashba
+spin-orbit coupling has been investigated theoretically using an InAs nanowire
+containing a surface two-dimensional electron gas as a model. The eigenstates,
+energy-momentum dispersion, and the energy-magnetic field dispersion relation
+are determined by solving the Schr\""odinger equation in a cylindrical symmetry
+The combination of states with the same total angular momentum but opposite
+spin orientation results in a periodic modulation of the axial spin component
+along the axis of the wire. Spin-precession about the wires axis is achieved by
+interference of two states with different total angular momentum. Because a
+superposition state with exact opposite spin precession exists at zero magnetic
+field, an oscillation of the spin orientation can be obtained. If an axially
+oriented magnetic field is applied, the spin gains an additional precessing
+component.",1011.4557v2
+2010-12-08,Spin-to-Charge Conversion of Mesoscopic Spin Currents,"Recent theoretical investigations have shown that spin currents can be
+generated by passing electric currents through spin-orbit coupled mesoscopic
+systems. Measuring these spin currents has however not been achieved to date.
+We show how mesoscopic spin currents in lateral heterostructures can be
+measured with a single-channel voltage probe. In the presence of a spin
+current, the charge current $I_{\rm qpc}$ through the quantum point contact
+connecting the probe is odd in an externally applied Zeeman field $B$, while it
+is even in the absence of spin current. Furthermore, the zero field derivative
+$\partial_B I_{\rm qpc}$ is proportional to the magnitude of the spin current,
+with a proportionality coefficient that can be determined in an independent
+measurement. We confirm these findings numerically.",1012.1831v2
+2011-04-04,Electric Control of Spin Currents and Spin-Wave Logic,"Spin waves in insulating magnets are ideal carriers for spin currents with
+low energy dissipation. An electric field can modify the dispersion of spin
+waves, by directly affecting, via spin-orbit coupling, the electrons that
+mediate the interaction between magnetic ions. Our microscopic calculations
+based on the super-exchange model indicate that this effect of the electric
+field is sufficiently large to be used to effectively control spin currents. We
+apply these findings to the design of a spin-wave interferometric device, which
+acts as a logic inverter and can be used as a building block for
+room-temperature, low-dissipation logic circuits.",1104.0657v2
+2014-04-11,Effect of contacts on spin lifetime measurements in graphene,"Injection, transmission, and detection of spins in a conducting channel are
+the basic ingredients of spintronic devices. Long spin lifetimes during transit
+are an important ingredient in realizing this technology. An attractive
+platform for this purpose is graphene, which has high mobilities and low
+spin-orbit coupling. Unfortunately, measured spin lifetimes are orders of
+magnitude smaller than theoretically expected. A source of spin loss is the
+resistance mismatch between the ferromagnetic electrodes and graphene. While
+this has been studied numerically, here we provide a closed form expression for
+Hanle spin precession which is the standard method of measuring spin lifetimes.
+This allows for a detailed characterization of the nonlocal spin valve device.",1404.3211v2
+2014-04-23,Semiclassical spin-spin dynamics and feedback control in transport through a quantum dot,"We present a theory of magnetotransport through an electronic orbital, where
+the electron spin interacts with a (sufficiently) large external spin via an
+exchange interaction. Using a semiclassical approximation, we derive a set of
+equations of motions for the electron density matrix and the mean value of the
+external spin that turns out to be highly nonlinear. The dissipation via the
+electronic leads is implemented in terms of a quantum master equation that is
+combined with the nonlinear terms of the spin-spin interaction. With an
+anisotropic exchange coupling a variety of dynamics is generated, such as
+self-sustained oscillations with parametric resonances or even chaotic
+behavior. Within our theory we can integrate a Maxwell-demon-like closed-loop
+feedback scheme that is capable of transporting particles against an applied
+bias voltage and that can be used to implement a spin filter to generate
+spin-dependent oscillating currents of opposite directions.",1404.5831v3
+2015-06-08,Coherent ultrafast spin-dynamics probed in three dimensional topological insulators,"Topological insulators are candidates to open up a novel route in spin based
+electronics. Different to traditional ferromagnetic materials, where the
+carrier spin-polarization and magnetization are based on the exchange
+interaction, the spin properties in topological insulators are based on the
+coupling of spin- and orbit interaction connected to its momentum. Specific
+ways to control the spin-polarization with light have been demonstrated: the
+energy momentum landscape of the Dirac cone provides spin-momentum locking of
+the charge current and its spin. The directionality of spin and momentum, as
+well as control with light has been demonstrated. Here we demonstrate a
+coherent femtosecond control of spin-polarization for states in the valence
+band at around the Dirac cone.",1506.02692v1
+2015-07-21,Spin Gating of Mesoscopic Devices,"Inefficient screening of electric fields in nanoconductors makes electric
+manipulation of electronic transport in nanodevices possible. Accordingly,
+electrostatic (charge) gating is routinely used to affect and control the
+Coulomb electrostatics and quantum interference in modern nanodevices. Besides
+their charge, another (quantum mechanical) property of electrons - their spin -
+is at the heart of modern spintronics, a term implying that a number of
+magnetic and electrical properties of small systems are simultaneously
+harvested for device applications. In this review the possibility to achieve
+""spin gating"" of mesoscopic devices, i.e. the possibility of an external spin
+control of the electronic properties of nanodevices is discussed. Rather than
+the Coulomb interaction, which is responsible for electric-charge gating, we
+consider two other mechanisms for spin gating. These are on the one hand the
+magnetic exchange interaction in magnetic devices and on the other hand the
+spin-orbit coupling (""Rashba effect""), which is prominent in low dimensional
+conductors. A number of different phenomena demonstrating the spin gating
+phenomenon will be discussed, including the spintro-mechanics of magnetic
+shuttling, Rashba spin splitting, and spin-gated weak superconductivity.",1507.05822v1
+2016-04-25,Giant intrinsic spin Hall effect in the TaAs family of Weyl semimetals,"Since their discovery, topological insulators have been expected to be ideal
+spintronic materials owing to the spin currents carried by surface states with
+spin--momentum locking. However, the bulk doping problem remains an obstacle
+that hinders such application. In this work, we predict that a newly discovered
+family of topological materials, the Weyl semimetals, exhibits large intrinsic
+spin Hall effects that can be utilized to generate and detect spin currents.
+Our $ab~initio$ calculations reveal a large spin Hall conductivity that is
+comparable to that of $4d$ and $5d$ transition metals. The spin Hall effect
+originates intrinsically from the bulk band structure of Weyl semimetals, which
+exhibit a large Berry curvature and spin--orbit coupling, so the bulk carrier
+problem in the topological insulators is naturally avoided. Our work not only
+paves the way for employing Weyl semimetals in spintronics, but also proposes a
+new guideline for searching for the spin Hall effect in various topological
+materials.",1604.07167v2
+2018-02-13,All-electrical manipulation of silicon spin qubits with tunable spin-valley mixing,"We show that the mixing between spin and valley degrees of freedom in a
+silicon quantum bit (qubit) can be controlled by a static electric field acting
+on the valley splitting $\Delta$. Thanks to spin-orbit coupling, the qubit can
+be continuously switched between a spin mode (where the quantum information is
+encoded into the spin) and a valley mode (where the the quantum information is
+encoded into the valley). In the spin mode, the qubit is more robust with
+respect to inelastic relaxation and decoherence, but is hardly addressable
+electrically. It can however be brought into the valley mode then back to the
+spin mode for electrical manipulation. This opens new perspectives for the
+development of robust and scalable, electrically addressable spin qubits on
+silicon. We illustrate this with tight-binding simulations on a so-called
+""corner dot"" in a silicon-on-insulator device where the confinement and valley
+splitting can be independently tailored by a front and a back gate.",1802.04693v1
+2013-08-26,Spin Hall effect in AA-stacked bilayer graphene,"Intrinsic spin Hall effect in the AA-stacked bilayer graphene is studied
+theoretically. The low-energy electronic spectrum for states in the vicinity of
+the Dirac points is obtained from the corresponding $\mathbf{k}\cdot\mathbf{p}$
+Hamiltonian. The spin Hall conductivity in the linear response regime is
+determined within the Green function formalism. Conditions for the existence of
+spin Hall insulator phase are also analyzed, and it is shown that the spin Hall
+insulator phase can exist for a sufficiently large spin-orbit coupling, which
+opens a gap in the spectrum. The electric field perpendicular to the graphene
+plane leads then to reduction of the gap width and suppression of the spin Hall
+insulator phase. The low temperature spin Nernst effect is also calculated from
+the zero temperature spin Hall conductivity.",1308.5549v1
+2014-06-18,Controlling spin relaxation in hexagonal BN-encapsulated graphene with a transverse electric field,"We experimentally study the electronic spin transport in hBN encapsulated
+single layer graphene nonlocal spin valves. The use of top and bottom gates
+allows us to control the carrier density and the electric field independently.
+The spin relaxation times in our devices range up to 2 ns with spin relaxation
+lengths exceeding 12 $\mu$m even at room temperature. We obtain that the ratio
+of the spin relaxation time for spins pointing out-of-plane to spins in-plane
+is $\tau_{\bot} / \tau_{||} \approx$ 0.75 for zero applied perpendicular
+electric field. By tuning the electric field this anisotropy changes to
+$\approx$0.65 at 0.7 V/nm, in agreement with an electric field tunable in-plane
+Rashba spin-orbit coupling.",1406.4656v2
+2017-06-14,Spin inversion in fluorinated graphene n-p junction,"We consider a dilute fluorinated graphene nanoribbon as a spin-active
+element. The fluorine adatoms introduce a local spin-orbit Rashba interaction
+that induces spin-precession for electron passing by. In the absence of the
+external magnetic field the transport is dominated by multiple scattering by
+adatoms which cancels the spin precession effects, since the direction of the
+spin precession depends on the electron momentum. Accumulation of the spin
+precession effects is possible provided that the Fermi level electron passes
+many times near the same adatom with the same momentum. In order to arrange for
+these conditions a circular n-p junction can be introduced to the ribbon by
+e.g. potential of the tip of an atomic force microscope. In the quantum Hall
+conditions the electron current gets confined along the junction. The electron
+spin interaction with the local Rashba field changes with the lifetime of the
+quasi-bound states that is controlled with the coupling of the junction to the
+edge of the ribbon. We demonstrate that the spin-flip probability can be
+increased in this manner by as much as three orders of magnitude.",1706.04490v2
+2017-06-26,Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2 As2,"We use neutron polarization analysis to study temperature dependence of the
+spin excitation anisotropy in BaFe$_2$As$_2$, which has a
+tetragonal-to-orthorhombic structural distortion at $T_s$ and antiferromagnetic
+(AF) phase transition at $T_N$ with ordered moments along the orthorhombic
+$a$-axis below $T_s\approx T_N\approx 136$ K. In the paramagnetic tetragonal
+state at 160 K, spin excitations are isotropic in spin space with
+$M_a=M_b=M_c$, where $M_a$, $M_b$, and $M_c$ are spin excitations polarized
+along the $a$, $b$, and $c$-axis directions of the orthorhombic lattice,
+respectively. On cooling towards $T_N$, significant spin excitation anisotropy
+with $M_a>M_b\approx M_c$ develops below 3 meV with a diverging $M_a$ at $T_N$.
+The in-plane spin excitation anisotropy in the tetragonal phase of
+BaFe$_2$As$_2$ is similar to those seen in the tetragonal phase of its electron
+and hole-doped superconductors, suggesting that spin excitation anisotropy is a
+direct probe of doping dependence of spin-orbit coupling and its connection to
+superconductivity in iron pnictides.",1706.08258v1
+2018-09-09,Spin transfer torques and spin-dependent transport in a metallic F/AF/N tunneling junction,"We study spin-dependent electron transport through a
+ferromagnetic-antiferromagnetic-normal metal tunneling junction subject to a
+voltage or temperature bias, in the absence of spin-orbit coupling. We derive
+microscopic formulas for various types of spin torque acting on the
+antiferromagnet as well as for charge and spin currents flowing through the
+junction. The obtained results are applicable in the limit of slow
+magnetization dynamics. We identify a parameter regime in which an
+unconventional damping-like torque can become comparable in magnitude to the
+equivalent of the conventional Slonczewski's torque generalized to
+antiferromagnets. Moreover, we show that the antiferromagnetic sublattice
+structure opens up a channel of electron transport which does not have a
+ferromagnetic analogue and that this mechanism leads to a pronounced field-like
+torque. Both charge conductance and spin current transmission through the
+junction depend on the relative orientation of the ferromagnetic and the
+antiferromagnetic vectors (order parameters). The obtained formulas for charge
+and spin currents allow us to identify the microscopic mechanisms responsible
+for this angular dependence and to assess the efficiency of an
+antiferromagnetic metal acting as a spin current polarizer.",1809.02950v1
+2019-07-17,Transverse photon spin beyond interfaces,"Photons possess spin degree of freedom, corresponding to clockwise and
+counter clockwise rotating direction of the fields. Photon spin plays an
+important role in various applications such as optical communications,
+information processing and sensing. In conventional isotropic media, photon
+spin is aligned with the propagation direction of light, obeying spin momentum
+locking. Interestingly, at certain interfaces, the surface waves decaying away
+from the interface possess a photon spin transverse to its propagation, opening
+exciting opportunities for observation of spin dependent unidirectional
+excitation in confined systems. Here we propose and realize transverse photon
+spin (T-spin) in the interior of a bulk medium, without relying on the presence
+of any interfaces. We show the complete mapping of the T-spin of surface modes
+to that of the bulk modes by introducing the coupling between electric and
+magnetic responses along orthogonal directions, i.e., the bianisotropy, into
+the medium. We further discover that an interface formed by two bianisotropic
+media of opposite orientations supports edge-dependent propagating modes with
+tunable cutoff frequencies. Our results provide a new platform for manipulating
+the spin orbit interaction of electromagnetic waves.",1907.07654v1
+2020-04-03,Spin-Excitations Anisotropy in the Bilayer Iron-Based Superconductor CaKFe$_4$As$_4$,"We use polarized inelastic neutron scattering to study the spin-excitations
+anisotropy in the bilayer iron-based superconductor CaKFe$_4$As$_4$ ($T_c$ = 35
+K). In the superconducting state, both odd and even $L-$modulations of spin
+resonance have been observed in our previous unpolarized neutron scattering
+experiments (T. Xie {\it et al.} Phys. Rev. Lett. {\bf 120}, 267003 (2018)).
+Here we find that the high-energy even mode ($\sim 18$ meV) is isotropic in
+spin space, but the low-energy odd modes consist of a $c-$axis polarized mode
+around 9 meV along with another partially overlapped in-plane mode around 12
+meV. We argue that such spin anisotropy is induced by the spin-orbit coupling
+in the spin-vortex-type fluctuations of this unique compound. The spin
+anisotropy is strongly affected by the superconductivity, where it is weak
+below 6 meV in the normal state and then transferred to higher energy and
+further enhanced in the odd mode of spin resonance below $T_c$.",2004.01405v1
+2017-05-09,Determination of spin relaxation times in heavy metals via 2nd harmonic spin injection magnetoresistance,"In tunnel junctions between ferromagnets and heavy elements with strong spin
+orbit coupling the magnetoresistance is often dominated by tunneling
+anisotropic magnetoresistance (TAMR). This makes conventional DC spin injection
+techniques impractical for determining the spin relaxation time ($\tau_s$).
+Here, we show that this obstacle for measurements of $\tau_s$ can be overcome
+by 2nd harmonic spin-injection-magnetoresistance (SIMR). In the 2nd harmonic
+signal the SIMR is comparable in magnitude to TAMR, thus enabling Hanle-induced
+SIMR as a powerful tool to directly determine $\tau_s$. Using this approach we
+determined the spin relaxation time of Pt and Ta and their temperature
+dependences. The spin relaxation in Pt seems to be governed by Elliott-Yafet
+mechanism due to a constant resistivity $\times$spin relaxation time product
+over a wide temperature range.",1705.03149v1
+2018-03-04,Spin Hall effects without spin currents in magnetic insulators,"The spin Hall effect (SHE) is normally discussed in terms of a spin current,
+which is ill-defined in strongly spin-orbit-coupled systems because of spin
+non-conservation. In this work we propose an alternative view of SHE phenomena
+by relating them to a spin analog of charge polarization induced by an electric
+field. The spin density polarization is most conveniently defined in
+insulators, which can have a SHE if they break time-reversal symmetry, i.e. if
+they are magnetic. The reciprocal of this SHE is a counterpart of the inverse
+SHE (ISHE), and is manifested in magnetic insulators as a charge polarization
+induced by a Zeeman field gradient. We use a modified Kane-Mele model to
+illustrate the magnetic spin Hall effect, and to discuss its bulk-boundary
+relationship.",1803.01294v2
+2018-03-06,Electron spin inversion in gated silicene nanoribbons,"We study locally gated silicene nanoribbons as spin active devices. We find
+that the gated segments of nanoribbons with zigzag edge can be used to perform
+a spin inversion for the electron spins injected with an in-plane orientation.
+The strong intrinsic spin-orbit coupling for low Fermi energy in presence of an
+external vertical electric field provides a fast spin precession around the
+axis perpendicular to the silicene plane. The spin inversion length can be as
+small as 10 nm. On the other hand in the armchair nanoribbons the spin
+inversion occurs via the Rashba effect which is weak and the spin inversion
+lengths are of the order of $\mu$m.",1803.02131v2
+2019-03-19,Nonlinear Inverse Spin Galvanic Effect in Anisotropic Disorder-free Systems,"Spin transport phenomena in solid materials suffer limitations from spin
+relaxation associated to disorder or lack of translational invariance.
+Ultracold atoms, free of that disorder, can provide a platform to observe
+phenomena beyond the usual two-dimensional electron gas. By generalizing the
+approach used for isotropic two-dimensional electron gases, we theoretically
+investigate the inverse spin galvanic effect in the two-level atomic system in
+the presence of anisotropic Rashba-Dresselhaus spin-orbit couplings (SOC) and
+external magnetic field. We show that the combination of the SOC results in an
+asymmetric case: the total spin polarization considered for a small momentum
+has a longer spin state than in a two-dimensional electron gas when the SOC
+field prevails over the external electric field. Our results can be relevant
+for advancing experimental and theoretical investigations in spin dynamics as a
+basic approach for studying spin state control.",1903.08269v1
+2019-06-26,Electric Dipole Spin Resonance of 2D Semiconductor Spin Qubits,"Monolayer transition metal dichalcogenides (TMDs) offer a novel
+two-dimensional platform for semiconductor devices. One such application,
+whereby the added low dimensional crystal physics (i.e. optical spin selection
+rules) may prove TMDs a competitive candidate, are quantum dots as qubits. The
+band structure of TMD monolayers offers a number of different degrees of
+freedom and combinations thereof as potential qubit bases, primarily electron
+spin, valley isospin and the combination of the two due to the strong spin
+orbit coupling known as a Kramers qubit. Pure spin qubits in monolayer MoX$_2$
+(where X=S or Se) can be achieved by energetically isolating a single valley
+and tuning to a spin degenerate regime within that valley by a combination of a
+sufficiently small quantum dot radius and large perpendicular magnetic field.
+Within such a TMD spin qubit, we theoretically analyse single qubit rotations
+induced by electric dipole spin resonance. We employ a rotating wave
+approximation within a second order time dependent Schrieffer-Wolf effective
+Hamiltonian to derive analytic expressions for the Rabi frequency of single
+qubit oscilations, and optimise the mechanism or the parameters to show
+oscilations up to $250\,{\rm MHz}$.",1906.11350v1
+2021-05-22,Spin Seebeck effect of correlated magnetic molecules,"In this paper we investigate the spin-resolved thermoelectric properties of
+strongly correlated molecular junctions in the linear response regime. The
+magnetic molecule is modeled by a single orbital level to which the molecular
+core spin is attached by an exchange interaction. Using the numerical
+renormalization group method we analyze the behavior of the (spin) Seebeck
+effect, heat conductance and figure of merit for different model parameters of
+the molecule. We show that the thermopower strongly depends on the strength and
+type of the exchange interaction as well as the molecule's magnetic anisotropy.
+When the molecule is coupled to ferromagnetic leads, the thermoelectric
+properties reveal an interplay between the spin-resolved tunneling processes
+and intrinsic magnetic properties of the molecule. Moreover, in the case of
+finite spin accumulation in the leads, the system exhibits the spin Seebeck
+effect. We demonstrate that a considerable spin Seebeck effect can develop when
+the molecule exhibits an easy-plane magnetic anisotropy, while the sign of the
+spin thermopower depends on the type and magnitude of the molecule's exchange
+interaction.",2105.10713v1
+2021-12-21,Spin accumulation without spin current,"The spin Hall (SH) effect is a phenomenon in which the spin current flows
+perpendicular to an applied electric field and causes the spin accumulation at
+the boundaries. However, in the presence of spin-orbit couplings, the spin
+current is not well defined. Here, we calculate the spin response to an
+electric-field gradient, which naturally appears at the boundaries. We derive a
+generic formula using the Bloch wave functions and the phenomenological
+relaxation time. We also calculate the response for the uniform Rashba model
+with $\delta$-function nonmagnetic disorder within the first-order Born
+approximation and corresponding vertex corrections. We find the nonzero spin
+accumulation, although the SH conductivity exactly vanishes.",2112.11043v3
+2022-03-10,Long-range current-induced spin accumulation in chiral crystals,"Chiral materials, similarly to human hands, have distinguishable right-handed
+and left-handed enantiomers which may behave differently in response to
+external stimuli. Here, we use for the first time an approach based on the
+density functional theory (DFT)+PAOFLOW calculations to quantitatively estimate
+the so-called collinear Rashba-Edelstein effect (REE) that generates spin
+accumulation parallel to charge current and can manifest as chirality-dependent
+charge-to-spin conversion in chiral crystals. Importantly, we reveal that the
+spin accumulation induced in the bulk by an electric current is intrinsically
+protected by the quasi-persistent spin helix arising from the crystal
+symmetries present in chiral systems with the Weyl spin-orbit coupling. In
+contrast to conventional REE, spin transport can be preserved over large
+distances, in agreement with the recent observations for some chiral materials.
+This allows, for example, the generation of spin currents from spin
+accumulation, opening novel routes for the design of solid-state spintronics
+devices.",2203.05518v2
+2022-04-07,The chirality-dependent second-order spin current in systems with time-reversal symmetry,"Spin currents proportional to the first- and second-order of the electric
+field are calculated in a specific tight-binding model with time-reversal
+symmetry. Specifically, a tight-binding model with time-reversal symmetry is
+constructed with chiral hopping and spin-orbit coupling. The spin conductivity
+of the model is calculated using the Boltzmann equation. As a result, it is
+clarified that the first-order spin current of the electric field vanishes,
+while the second-order spin current can be finite. Furthermore, the spin
+current changes its sign by reversing the chirality of the model. The present
+results reveal the existence of spin currents in systems with time-reversal
+symmetry depending on the chirality of the system. They may provide useful
+information for understanding the chirality-dependent spin polarization
+phenomena in systems with time-reversal symmetry.",2204.03263v1
+2022-10-12,Perfect optical spin-filtering in antiferromagnetic stanene nanoribbons induced by band bending and uniaxial strain,"Non-equilibrium spin-polarized transport properties of antiferromagnetic
+stanene nanoribbons are theoretically studied under the combining effect of a
+normal electric field and linearly polarized irradiation based on the
+tight-binding model at room temperature. Due to the existence of spin-orbit
+coupling in stanene lattice, applying normal electric field leads to splitting
+of band degeneracy of spin-resolved energy levels in conduction and valence
+bands. Furthermore, unequivalent absorption of the polarized photons at two
+valleys which is attributed to an antiferromagnetic exchange field results in
+unequal spin-polarized photocurrent for spin-up and spin-down components.
+Interestingly, in the presence of band bending which has been induced by edge
+potentials, an allowable quantum efficiency occurs over a wider wavelength
+region of the incident light. It is especially important that the variation of
+an exchange magnetic field generates spin semi-conducting behavior in the
+bended band structure. Moreover, it is shown that optical spin-filtering effect
+is obtained under the simultaneous effect of uniaxial strain and narrow edge
+potential.",2210.06037v1
+2023-04-26,Spin-dependent Destructive Quantum Interference Associated with Chirality-induced Spin Selectivity in Circular Single Helix Molecules,"Theoretical studies on spin-dependent transport through helical molecules
+with straight spiral geometry have received intense research interest in the
+past decade, however, the physics in circular helical molecules has still less
+been explored. In this work, we theoretically construct a circular single helix
+(CSH) possessing the chirality-induced spin-orbit coupling and contacting with
+two non-magnetic electrodes. Our theoretical calculations demonstrate that the
+spin-related transport in CSH exhibits the so-called chiral-induced spin
+selectivity (CISS) effect and more importantly, the CISS-reduced spin-dependent
+destructive quantum interference (DQI) also occurs in the CSH, without any
+external magnetic field or magnetic electrodes. Moreover, the changing of CSH
+length or the electrode positions exhibits specific patterns in the
+spin-polarized conductance. Particularly, the dephasing magnitude can adjust
+effectively these two spin-dependent effects to realize their coexistence.
+Additionally, the phase transition between the CISS-dependent constructive
+quantum interference (CQI) and DQI is also observed in the CSH. Our theoretical
+work puts forwards a new material plateau to explore the CISS and to exhibit
+the novel CISS-dependent CQI effect.",2304.13305v1
+2023-08-08,Chirality-induced spin splitting in 1D InSeI,"Spin-orbit coupling in chiral materials can induce chirality-dependent spin
+splitting, enabling electrical manipulation of spin polarization. Here, we use
+first-principles calculations to investigate the electronic states of chiral
+one-dimensional (1D) semiconductor InSeI, which has two enantiomorphic
+configurations with left- and right-handedness. We find that opposite spin
+states exist in the left- and right-handed 1D InSeI with significant spin
+splitting and spin-momentum collinear locking. Although the spin states at the
+conduction band minimum (CBM) and valence band maximum (VBM) of 1D InSeI are
+both nearly degenerate, a direct-to-indirect bandgap transition occurs when a
+moderate tensile strain ($\sim$4%) is applied along the 1D chain direction,
+leading to a sizable spin splitting ($\sim$0.11 eV) at the CBM. These findings
+indicate that 1D InSeI is a promising material for chiral spintronics.",2308.04350v2
+2023-08-14,Converting a triplet Cooper pair supercurrent into a spin-signal,"Superconductivity with spin-polarized Cooper pairs is known to emerge by
+combining conventional spinless superconductors with materials that have
+spin-dependent interactions, such as magnetism and spin-orbit coupling. This
+enables a dissipationless and conserved flow of spin. However, actually
+utilizing the spin-polarization of such supercurrents have proven challenging.
+Here, we predict an experimental signature of current-carrying triplet Cooper
+pairs in the form of an induced spin-signal. We show that a supercurrent
+carried only by triplet Cooper pairs induces a non-local magnetization that is
+controlled by the polarization direction of the triplet Cooper pairs. This
+provides a measurement protocol to directly use the spin-polarization of the
+triplet Cooper pairs in supercurrents to transfer spin information in a
+dissipationless manner.",2308.07226v1
+2023-08-26,Non-equilibrium spin polarisation via interfacial exchange-field spin filtering,"A key phenomenon that enables nanoscale spintronic devices is the efficient
+inter-conversion between spin and charge degrees of freedom. Here, we
+experimentally demonstrate a pathway to generate current-induced spin
+polarization at the interface between an insulating ferromagnet and a
+non-magnetic metal using interfacial exchange-field spin filtering. Measuring
+current-in-plane giant magnetoresistance in Py$|$Cu$|$EuS trilayer Hall cross
+devices, we induce a non-equilibrium spin polarization of
+$P_\text{neq}^\text{Cu|EuS}$=0.6% at a low charge current density of
+1.88$\times$10$^3$ A/cm$^2$. This efficiency is comparable to that of
+conventional charge-to-spin conversion of spin-Hall or Rashba-Edelstein effects
+enabled by relativistic spin-orbit coupling. Interfacial exchange field
+filtering allows operation with largely reduced power consumption and magnetic
+reconfigurability, opening new pathways to nanoscale low-power insulator
+spintronics.",2308.13855v1
+2023-09-05,Strong and nearly 100$\%$ spin-polarized second-harmonic generation from ferrimagnet Mn$_{2}$RuGa,"Second-harmonic generation (SHG) has emerged as a promising tool for
+detecting electronic and magnetic structures in noncentrosymmetric materials,
+but 100$\%$ spin-polarized SHG has not been reported. In this work, we
+demonstrate nearly 100$\%$ spin-polarized SHG from half-metallic ferrimagnet
+Mn$_{2}$RuGa. A band gap in the spin-down channel suppresses SHG, so the
+spin-up channel contributes nearly all the signal, as large as 3614 pm/V about
+10 times larger than that of GaAs. In the spin-up channel, $\chi_{xyz}^{(2)}$
+is dominated by the large intraband current in three highly dispersed bands
+near the Fermi level. With the spin-orbit coupling (SOC), the reduced magnetic
+point group allows additional SHG components, where the interband contribution
+is enhanced. Our finding is important as it predicts a large and complete
+spin-polarized SHG in a all-optical spin switching ferrimagnet. This opens the
+door for future applications.",2309.01965v1
+2020-10-23,Current-induced orbital magnetization in systems without inversion symmetry,"In systems with time-reversal symmetry, the orbital magnetization is zero in
+equilibrium. Recently, it has been proposed that the orbital magnetization can
+be induced by an electric current in a helical crystal structure in the same
+manner as that in a classical solenoid. In this paper, we extend this theory
+and study the current-induced orbital magnetization in a broader class of
+systems without inversion symmetry. First, we consider polar metals which have
+no inversion symmetry. We find that the current-induced orbital magnetization
+appears in a direction perpendicular to the electric current even without
+spin-orbit coupling. Using the perturbation method, we physically clarify how
+the current-induced orbital magnetization appears in polar metals. As an
+example, we calculate the current-induced orbital magnetization in SnP, and
+find that it might be sufficiently large for measurement. Next, we consider a
+two-dimensional system without inversion symmetry. We establish a method to
+calculate the current-induced orbital magnetization in the in-plane direction
+by using real-space coordinates in the thickness direction. By applying this
+theory to surfaces and interfaces of insulators, we find that an electric
+current along surfaces and interfaces induces an orbital magnetization
+perpendicular to the electric current.",2010.12159v1
+2023-08-09,Complexity reduction in self-interaction-free density functional calculations using the Fermi-Löwdin self-interaction correction method,"Fermi-L\""owdin (FLO) self-interaction-correction (SIC) (FLOSIC) method uses
+symmetric orthogonalized Fermi orbitals as localized orbitals in one-electron
+SIC schemes resulting in a formal reduction in the scaling of SIC methods (e.g.
+Perdew-Zunger SIC (PZSIC) method) but requires a set of Fermi orbital
+descriptors used to define the FLOs which can be computationally taxing. Here,
+we propose to simplify the SIC calculations using a selective orbital scaling
+self-interaction correction (SOSIC) by removing SIE from a select set of
+orbitals that are of interest. We illustrate the approach by choosing a valence
+set of orbitals as active orbitals in the SOSIC approach. The results obtained
+using the vSOSIC scheme are compared with those obtained with PZSIC which
+corrects for SIE of all orbitals. The comparison is made for atomization
+energies, barrier heights, ionization energies (absolute highest occupied
+orbital [HOO] eigenvalues), exchange coupling constant and spin densities of
+Cu-containing complexes, and vertical detachment energies (VDE) of water
+cluster anions. The agreement between the two methods is within a few percent
+for the majority of the properties. The MAE in the VDE (absolute HOO
+eigenvalue) of water cluster anions with vSOSIC-PBE with respect to benchmark
+CCSD(T) results is only 15 meV making vSOSIC-PBE an excellent alternative to
+the CCSD(T) to obtain the VDE of water cluster anions. The vSOSIC calculation
+on [Cu$_2$Cl$_6$]$^{2-}$ complex demonstrates that, in addition to the cost
+savings from using fewer orbitals to account for SIC, the FOD optimization in
+vSOSIC is also substantially smoother and faster.",2308.04664v1
+2010-06-14,Non-Abelian quantum order in spin-orbit-coupled semiconductors: The search for topological Majorana particles in solid state systems,"We show that an ordinary semiconducting thin film with spin-orbit coupling
+can, under ap- propriate circumstances, be in a quantum topologically ordered
+state supporting exotic Majorana excitations which follow non-Abelian
+statistics. The key to the quantum topological order is the coexistence of
+spin-orbit coupling with proximity-induced s-wave superconductivity and an
+externally-induced Zeeman coupling of the spins. For the Zeeman coupling below
+a critical value, the system is a non-topological (proximity-induced) s-wave
+superconductor. However, for a range of Zeeman coupling above the critical
+value, the lowest energy excited state inside a vortex is a zero-energy
+Majorana fermion state. The system, thus, has entered into a non-Abelian s-wave
+superconducting state via a topological quantum phase transition (TQPT) tuned
+by the Zeeman coupling. In the one-dimensional version of the same structure
+and for the Zeeman coupling above the critical value, there are localized
+Majorana zero-energy modes at the two ends of a semiconducting quantum
+nanowire. In this case, the Zeeman coupling can be induced more easily by an
+external magnetic field parallel to the wire, obviating the need for a magnetic
+insulator. We show that, despite the fact that the superconducting pair
+potential in the nanowire is explicitly s-wave, tunneling of electrons to the
+ends of the wire reveals a pronounced zero-bias peak. Such a peak is absent
+when the Zeeman coupling is below its critical value, i.e., the nanowire is in
+the non-topological s-wave superconducting state. We argue that the observation
+of this zero-bias tunneling peak in the semiconductor nanowire is possibly the
+simplest and clearest experiment proposed so far to unambiguously detect a
+Majorana fermion mode in a condensed matter system.",1006.2829v2
+1996-05-16,Orbital Decay of the PSR J0045-7319/B Star Binary System: Age of Radio Pulsar and Initial Spin of Neutron Star,"Recent timing observations of PSR J0045-7319 reveal that the neutron star/B
+star binary orbit is decaying on a time scale of $|\Porb/\dot\Porb|=0.5$ Myr,
+shorter than the characteristic age ($\tau_c=3$ Myr) of the pulsar (Kaspi et
+al.~1996a). We study mechanisms for the orbital decay. The standard weak
+friction theory based on static tide requires far too short a viscous time to
+explain the observed $\dot\Porb$. We show that dynamical tidal excitation of
+g-modes in the B star can be responsible for the orbital decay. However, to
+explain the observed short decay timescale, the B star must have some
+significant retrograde rotation with respect to the orbit --- The retrograde
+rotation brings lower-order g-modes, which couple much more strongly to the
+tidal potential, into closer ``resonances'' with the orbital motion, thus
+significantly enhancing the dynamical tide. A much less likely possibility is
+that the g-mode damping time is much shorter than the ordinary radiative
+damping time. The observed orbital decay timescale combined with a generic
+orbital evolution model based on dynamical tide can be used as a ``timer'',
+giving an upper limit of $1.4$ Myr for the age of the binary system since the
+neutron star formation. Thus the characteristic age of the pulsar is not a good
+age indicator. Assuming standard magnetic dipole braking for the pulsar and no
+significant magnetic field decay on a timescale $\lo 1$ Myr, the upper limit
+for the age implies that the initial spin of the neutron star at birth was
+close to its current value.",9605096v1
+2021-03-29,Bilayer graphene encapsulated within monolayers of WS$_2$ or Cr$_2$Ge$_2$Te$_6$: Tunable proximity spin-orbit or exchange coupling,"Van der Waals (vdW) heterostructures consisting of bilayer graphene (BLG)
+encapsulated within monolayers of strong spin-orbit semiconductor WS$_2$ or
+ferromagnetic semiconductor Cr$_2$Ge$_2$Te$_6$ (CGT), are investigated. By
+performing realistic first-principles calculations we capture the essential BLG
+band structure features, including layer- and sublattice-resolved proximity
+spin-orbit or exchange couplings. For different relative twist angles (0 or
+60$^{\circ}$) of the WS$_2$ layers, and the magnetizations (parallel or
+antiparallel) of the CGT layers, with respect to BLG, the low energy bands are
+found and characterized by a series of fit parameters of model Hamiltonians.
+These effective models are then employed to investigate the tunability of the
+relevant energy dispersions by a gate field. For WS$_2$/BLG/WS$_2$
+encapsulation we find that twisting allows to turn off the spin splittings away
+from the $K$ points, due to opposite proximity-induced valley-Zeeman couplings
+in the two sheets of BLG. Close to the $K$ points the electron spins are
+polarized out of the plane. This polarization can be flipped by applying a gate
+field. As for magnetic CGT/BLG/CGT structures, we realize the recently proposed
+spin-valve effect, whereby a gap opens for antiparallel magnetizations of the
+CGT layers. Furthermore, we find that for the antiferromagnetic orientation the
+electron states away from $K$ have vanishingly weak proximity exchange, while
+the states close to $K$ remain spin polarized in the presence of an electric
+field. The induced magnetization can be flipped by changing the gate field.
+These findings should be useful for spin transport, spin filtering, and spin
+relaxation anisotropy studies of BLG-based vdW heterostructures.",2103.15378v2
+2001-11-29,Zeeman effects on the impurity-induced resonances in d-wave superconductors,"It is shown how the resonant states induced by a single spinless impurity in
+a d-wave superconductor evolve under the effect of an applied Zeeman magnetic
+field. Moreover, it is demonstrated that the spin-orbit coupling to the
+impurity potential can have important and characteristic effects on the
+resonant states and their response to the Zeeman field, especially when the
+impurity is close to the unitary limit. For zero or very small spin-orbit
+interaction, the resonant states becomes Zeeman splitted by the magnetic field
+while when the spin-orbit coupling is important, new low-lying resonances arise
+which do not show any Zeeman splitting.",0111554v2
+2004-06-11,Weak spin-orbit interactions induce exponentially flat mini-bands in magnetic metals without inversion symmetry,"In metallic magnets like MnSi the interplay of two very weak spin-orbit
+coupling effects can strongly modify the Fermi surface. In the absence of
+inversion symmetry even a very small Dzyaloshinsky-Moriya interaction of
+strength delta<<1 distorts a ferromagnetic state into a chiral helix with a
+long pitch of order 1/delta. We show that additional small spin-orbit coupling
+terms of order delta in the band structure lead to the formation of
+exponentially flat minibands with a bandwidth of order exp(-1/sqrt(delta))
+parallel to the direction of the helix. These flat minibands cover a rather
+broad belt of width sqrt(delta) on the Fermi surface where electron motion
+parallel to the helix practically stops. We argue that these peculiar
+band-structure effects lead to pronounced features in the anomalous skin
+effect.",0406259v2
+2006-02-22,Single electron control in n-type semiconductor quantum dots using non-Abelian holonomies generated by spin orbit coupling,"We propose that n-type semiconductor quantum dots with the Rashba and
+Dresselhaus spin orbit interactions may be used for single electron
+manipulation through adiabatic transformations between degenerate states. All
+the energy levels are discrete in quantum dots and possess a double degeneracy
+due to time reversal symmetryin the presence of the Rashba and/or Dresselhaus
+spin orbit coupling terms. We find that the presence of double degeneracy does
+not necessarily give rise to a finite non-Abelian (matrix) Berry phase. We show
+that a distorted two-dimensional harmonic potential may give rise to
+non-Abelian Berry phases. The presence of the non-Abelian Berry phase may be
+tested experimentally by measuring the optical dipole transitions.",0602512v1
+2008-08-05,P-wave Lambda N - Sigma N coupling and the spin-orbit splitting of 9 Lambda Be,"We reexamine the spin-orbit splitting of 9 Lambda Be excited states in terms
+of the SU_6 quark-model baryon-baryon interaction. The previous folding
+procedure to generate the Lambda alpha spin-orbit potential from the
+quark-model Lambda N LS interaction kernel predicted three to five times larger
+values for Delta E_{ell s}=E_x(3/2^+)-E_x(5/2^+) in the model FSS and fss2.
+This time, we calculate Lambda alpha LS Born kernel, starting from the LS
+components of the nuclear-matter G-matrix for the Lambda hyperon. This
+framework makes it possible to take full account of an important P-wave Lambda
+N - Sigma N coupling through the antisymmetric LS^{(-)} force involved in the
+Fermi-Breit interaction. We find that the experimental value, Delta
+E^{exp}_{ell s}=43 pm 5 keV, is reproduced by the quark-model G-matrix LS
+interaction with a Fermi-momentum around k_F=1.0 fm^{-1}, when the model FSS is
+used in the energy-independent renormalized RGM formalism.",0808.0628v1
+2008-09-05,"Optical Spectroscopy in CoO: Phonons, Electric, and Magnetic Excitations","The reflectivity of single-crystalline CoO has been studied by optical
+spectroscopy for wave numbers ranging from 100 to 28,000\wn and for
+temperatures 8 $< T <$ 325 K\@. A splitting of the cubic IR-active phonon mode
+on passing the antiferromagnetic phase transition at $T_N$ = 289 K has been
+observed. At low temperatures the splitting amounts to 15.0\wn. In addition, we
+studied the splitting of the cubic crystal field ground state of the Co$^{2+}$
+ions due to spin-orbit coupling, a tetragonal crystal field, and exchange
+interaction. Below $T_N$, magnetic dipole transitions between the
+exchange-split levels are identified and the energy-level scheme can be well
+described with a spin-orbit coupling $\lambda = 151.1\wn$, an exchange constant
+$J = 17.5\wn$, and a tetragonal crystal-field parameter $D = -47.8\wn$. Already
+in the paramagnetic state electric quadrupole transitions between the
+spin-orbit split level have been observed. At high frequencies, two electronic
+levels of the crystal-field-split $d$-manifold were identified at 8,000 and
+18,500\wn.",0809.0997v1
+2009-02-09,Microscopic theory of the nematic phase in Sr$_3$Ru$_2$O$_7$,"In an externally applied magnetic field, ultra-pure crystals of the bilayer
+compound Sr$_3$Ru$_2$O$_7$ undergo a metamagnetic transition below a critical
+temperature, $T^*$, which varies as a function of the angle between the
+magnetic field $H$ and the Ru-O planes. Moreover, $T^*$ approaches zero when
+$H$ is perpendicular to the planes. This putative ""metamagnetic quantum
+critical point"", however, is preempted by a nematic fluid phase with order one
+resistive anisotropy in the {\it ab} plane. In a ""realistic"" bilayer model with
+moderate strength local Coulomb interactions, the existence of a sharp
+divergence of the electronic density of states near a van Hove singularity of
+the quasi-one-dimensional bands, and the spin-orbit couplings permitted by the
+presence of multiple orbitals result in a mean-field phase diagram which
+accounts for many of these experimentally observed phenomena. Although the
+spin-orbit coupling is not overly strong, it destroys the otherwise near
+perfect Fermi surface nesting and hence suppresses spin-density-wave (SDW)
+ordering.",0902.1336v2
+2010-06-16,The degree of 5f electron localization in URu2Si2: electron energy-loss spectroscopy and spin-orbit sum rule analysis,"We examine the degree of 5f electron localization in URu2Si2 using spin-orbit
+sum rule analysis of the U N4,5 (4d \to 5f) edge. When compared to {\alpha}-U
+metal, US, USe, and UTe, which have increasing localization of the 5f states,
+we find that the 5f states of URu2Si2 are more localized, although not
+entirely. Spin-orbit analysis shows that intermediate coupling is the correct
+angular momentum coupling mechanism for URu2Si2 when the 5f electron count is
+between 2.6 and 2.8. These results have direct ramifications for theoretical
+assessment of the hidden order state of URu2Si2, where the degree of
+localization of the 5f electrons and their contribution to the Fermi surface
+are critical.",1006.3111v1
+2011-04-04,Unconventional Fulde-Ferrel-Larkin-Ovchinnikov states in spin-orbit coupled condensates: exact results,"We find that a model Hamiltonian of s-wave superconductors in the presence of
+spin-orbit interactions and a Zeeman field is exactly solvable. Most
+intriguingly, based on the exact solutions, an unconventional type of
+Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) ground state is rigorously revealed, in
+which the center-of-mass momentum of the fermion pair is proportional to the
+Zeeman field. We also elaborate on the drifting effect of the Zeeman field on
+the spin-orbit-coupled Bose-Einstein condensate.",1104.0614v3
+2012-06-21,"Dielectric function, screening, and plasmons of graphene in the presence of spin-orbit interactions","We study the dielectric properties of graphene in the presence of Rashba and
+intrinsic spin-orbit interactions in their most general form, i.e., for
+arbitrary frequency, wave vector, doping, and spin-orbit coupling (SOC)
+parameters. The main result consists in the derivation of closed analytical
+expressions for the imaginary as well as for the real part of the polarization
+function. Several limiting cases, e.g., the case of purely Rashba or purely
+intrinsic SOC, and the case of equally large Rashba and intrinsic coupling
+parameters are discussed. In the static limit the asymptotic behavior of the
+screened potential due to charged impurities is derived. In the opposite limit
+($q=0$, $\omega\to0$), an analytical expression for the plasmon dispersion is
+obtained and afterwards compared to the numerical result. Our result can also
+be applied to related systems such as bilayer graphene or topological
+insulators.",1206.4849v2
+2012-10-08,Doped Mott Insulators in (111) Bilayers of Perovskite Transition-Metal Oxides with a Strong Spin-Orbit Coupling,"The electronic properties of Mott insulators realized in (111) bilayers of
+perovskite transition-metal oxides are studied. The low-energy effective
+Hamiltonians for such Mott insulators are derived in the presence of a strong
+spin-orbit coupling. These models are characterized by the antiferromagnetic
+Heisenberg interaction and the anisotropic interaction whose form depends on
+the $d$ orbital occupancy. From exact diagonalization analyses on finite
+clusters, the ground state phase diagrams are derived, including a Kitaev spin
+liquid phase in a narrow parameter regime for $t_{2g}$ systems. Slave-boson
+mean-field analyses indicate the possibility of novel superconducting states
+induced by carrier doping into the Mott-insulating parent systems, suggesting
+the present model systems as unique playgrounds for studying
+correlation-induced novel phenomena. Possible experimental realizations are
+also discussed.",1210.2290v3
+2013-06-03,"Dy-V magnetic interaction and local structure bias on the complex spin and orbital ordering in Dy$_{1-x}$Tb$_{x}$VO$_3$ (x\,=\,0 and 0.2)","The spin and orbital ordering in Dy$_{1-x}$Tb$_{x}$VO$_3$ (x\,=\,0 and 0.2)
+was studied by measuring x-ray powder diffraction, magnetization, specific
+heat, and neutron single crystal diffraction. The results show that G-OO/C-AF
+and C-OO/G-AF phases coexist in Dy$_{0.8}$Tb$_{0.20}$VO$_3$ in the temperature
+range 2\,K$\sim$60\,K and the volume fraction of each phase is temperature and
+field dependent. The ordering of Dy moments at T*\,=\,12\,K induces a
+transition from G-OO/C-AF to a C-OO/G-AF phase. Magnetic fields suppress the
+long range order of Dy moments and thus the C-OO/G-AF phase below T*. The
+polarized moments induced at the Dy sublattice by external magnetic fields
+couple to the V 3d moments and this coupling favors the G-OO/C-AF state. Also
+discussed is the effect of the Dy-V magnetic interaction and local structure
+distortion on the spin and orbital ordering in Dy$_{1-x}$Tb$_{x}$VO$_3$.",1306.0513v1
+2013-10-03,Synthetic spin-orbit interactions and magnetic fields in ring-cavity QED,"The interactions between light and matter are strongly enhanced when atoms
+are placed in high-finesse quantum cavities, offering tantalizing opportunities
+for generating exotic new quantum phases. In this work we show that both
+spin-orbit interactions and strong synthetic magnetic fields result when a
+neutral atom is confined within a ring cavity, whenever the internal atomic
+states are coupled to two off-resonant counter-propagating modes. We
+diagonalize the resulting cavity polariton Hamiltonian and find characteristic
+spin-orbit dispersion relations for a wide range of parameters. An adjustable
+uniform gauge potential is also generated, which can be converted into a
+synthetic magnetic field for neutral atoms by applying an external magnetic
+field gradient. Very large synthetic magnetic fields are possible as the
+strength is proportional to the (average) number of photons in each of the
+cavity modes. The results suggest that strong-coupling cavity quantum
+electrodynamics can be a useful environment for the formation of topological
+states in atomic systems.",1310.0884v1
+2013-12-18,Vortex dynamics in spin-orbit coupled Bose-Einstein condensates,"I use a time-dependent Lagrangian formalism and a variational trial function
+to study the dynamics of a two-component vortex in a spin-orbit coupled
+Bose-Einstein condensate (BEC). For a single-component BEC, various experiments
+have validated this theoretical approach, for example a thermal quench that
+yields a quantized vortex in roughly 25% of trials. To be definite, I assume
+the specific spin-orbit form used in recent NIST experiments, which introduces
+a spatial asymmetry because of the external Raman laser beams. I here
+generalize this formalism to include a two-component order parameter that has
+quantized circulation in each component but not necessarily with the same
+circulation. For example a singly quantized vortex in just one component yields
+a BEC analog of the half-quantum vortex familiar in $^3$He-A and in $p$-wave
+chiral superconductors. This and other unusual two-component vortices have both
+periodic trajectories and unbounded trajectories that leave the condensate,
+depending on the initial conditions. The optimized phase of the order parameter
+induces a term in the particle current that cancels the contribution from the
+vector potential, leaving pure circulating current around the vortex.",1312.5289v2
+2014-02-04,CaIrO3: a Spin-Orbit Mott Insulator Beyond the jeff = 1/2 Ground State,"In CaIrO3 electronic correlation, spin-orbit coupling, and tetragonal crystal
+field splitting are predicted to be of comparable strength. However, the nature
+of its ground state is still object of debate, with contradictory experimental
+and theoretical results. We probe the ground state of CaIrO3 and assess the
+effective tetragonal crystal field splitting and spin-orbit coupling at play in
+this system by means of resonant inelastic x-ray scattering. We conclude that
+insulating CaIrO3 is not a jeff = 1/2 iridate and discuss the consequences of
+our finding to the interpretation of previous experiments. In particular, we
+clarify how the Mott insulating state in iridates can be readily extended
+beyond the jeff = 1/2 ground state.",1402.0893v1
+2014-02-28,Probing anisotropy in a new noncentrosymmetric superconductor BiPd,"Strength of Rashba type antisymmetric spin orbit coupling has the crucial
+effect on superconducting and normal state properties in noncentrosymmetric
+(NCS) superconductors. This can be seen on various anisotropic properties of
+the system. For a system with lowered crystalline symmetry as in
+noncentrosymmetric crystals, the superconducting pairing state can have
+correlation to the normal state properties. In our earlier work we have shown
+that alfa-BiPd which has a monoclinic (P_21) structure with the absence of the
+centre of inversion exhibits bulk superconductivity at 3.8 K. In order to
+understand the role of spin-orbit scattering, we have studied the anisotropic
+properties of high quality single crystal (RRR 170) of NCS BiPd by measuring
+magnetic susceptibility, electrical transport from 1.8 K to 300 K and
+isothermal M_H loop (1.8 K to 3.8 K) in the superconducting state for <010> and
+<100> crystallographic directions respectively. Moderate anisotropy up to 30 %
+has been found in the electrical transport possibly indicating significant
+Rashba type antisymmetric spin orbit coupling present in alfa-BiPd.",1402.7232v1
+2014-07-16,Phase separation and long wave-length charge instabilities in spin-orbit coupled systems,"We investigate a two-dimensional electron model with Rashba spin-orbit
+interaction where the coupling constant $g=g(n)$ depends on the electronic
+density. It is shown that this dependence may drive the system unstable towards
+a long-wave length charge density wave (CDW) where the associated second order
+instability occurs in close vicinity to global phase separation. For very low
+electron densities the CDW instability is nesting-induced and the modulation
+follows the Fermi momentum $k_F$. At higher density the instability criterion
+becomes independent of $k_F$ and the system may become unstable in a broad
+momentum range. Finally, upon filling the upper spin-orbit split band, finite
+momentum instabilities disappear in favor of phase separation alone. We discuss
+our results with regard to the inhomogeneous phases observed at the
+LaAlO$_3$/SrTiO$_3$ or LaTiO$_3$/SrTiO$_3$ interfaces.",1407.4280v1
+2015-01-14,Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets,"Intraband and interband contributions to the current-driven spin-orbit torque
+in magnetic materials lacking inversion symmetry are theoretically studied
+using Kubo formula. In addition to the current-driven field-like torque ${\bf
+T}_{\rm FL}= \tau_{\rm FL}{\bf m}\times{\bf u}_{\rm so}$ (${\bf u}_{\rm so}$
+being a unit vector determined by the symmetry of the spin-orbit coupling), we
+explore the intrinsic contribution arising from impurity-independent interband
+transitions and producing an anti-damping-like torque of the form ${\bf T}_{\rm
+DL}= \tau_{\rm DL}{\bf m}\times({\bf u}_{\rm so}\times{\bf m})$. Analytical
+expressions are obtained in the model case of a magnetic Rashba two-dimensional
+electron gas, while numerical calculations have been performed on a dilute
+magnetic semiconductor (Ga,Mn)As modeled by the Kohn-Luttinger Hamiltonian
+exchanged coupled to the Mn moments. Parametric dependences of the different
+torque components and similarities to the analytical results of the Rashba
+two-dimensional electron gas in the weak disorder limit are described.",1501.03292v1
+2015-06-05,Multi-reference approach to the calculation of photoelectron spectra including spin-orbit coupling,"X-ray photoelectron spectra provide a wealth of information on the electronic
+structure. The extraction of molecular details requires adequate theoretical
+methods, which in case of transition metal complexes has to account for effects
+due to the multi-configurational and spin-mixed nature of the many-electron
+wave function. Here, the Restricted Active Space Self-Consistent Field method
+including spin-orbit coupling is used to cope with this challenge and to
+calculate valence and core photoelectron spectra. The intensities are estimated
+within the frameworks of the Dyson orbital formalism and the sudden
+approximation. Thereby, we utilize an efficient computational algorithm that is
+based on a biorthonormal basis transformation. The approach is applied to the
+valence photoionization of the gas phase water molecule and to the core
+ionization spectrum of the $\text{[Fe(H}_2\text{O)}_6\text{]}^{2+}$ complex.
+The results show good agreement with the experimental data obtained in this
+work, whereas the sudden approximation demonstrates distinct deviations from
+experiments.",1506.01826v1
+2015-06-30,Finite-size effects on the minimal conductivity in graphene with Rashba spin-orbit coupling,"We study theoretically the minimal conductivity of monolayer graphene in the
+presence of Rashba spin-orbit coupling. The Rashba spin-orbit interaction
+causes the low-energy bands to undergo trigonal-warping deformation and for
+energies smaller than the Lifshitz energy, the Fermi circle breaks up into
+parts, forming four separate Dirac cones. We calculate the minimal conductivity
+for an ideal strip of length $L$ and width $W$ within the Landauer--B\""uttiker
+formalism in a continuum and in a tight binding model. We show that the minimal
+conductivity depends on the relative orientation of the sample and the probing
+electrodes due to the interference of states related to different Dirac cones.
+We also explore the effects of finite system size and find that the minimal
+conductivity can be lowered compared to that of an infinitely wide sample.",1507.00022v1
+2016-04-08,Topological Mirror Insulators in One Dimension,"We demonstrate the existence of topological insulators in one dimension
+protected by mirror and time-reversal symmetries. They are characterized by a
+nontrivial $\mathbb{Z}_2$ topological invariant defined in terms of the
+""partial"" polarizations, which we show to be quantized in presence of a 1D
+mirror point. The topological invariant determines the generic presence or
+absence of integer boundary charges at the mirror-symmetric boundaries of the
+system. We check our findings against spin-orbit coupled Aubry-Andr\'e-Harper
+models that can be realized, e.g. in cold-atomic Fermi gases loaded in
+one-dimensional optical lattices or in density- and Rashba spin-orbit-modulated
+semiconductor nanowires. In this setup, in-gap end-mode Kramers doublets
+appearing in the topologically non-trivial state effectively constitute a
+double-quantum-dot with spin-orbit coupling.",1604.02427v2
+2017-02-22,Prediction of High Temperature Quantum Anomalous Hall Effect in Two Dimensional Transition-Metal Oxides,"Quantum anomalous Hall (QAH) insulator is a topological phase which exhibits
+chiral edge states in the absence of magnetic field. The celebrated Haldane
+model is the first example of QAH effect, but difficult to realize. Here, we
+predict the two-dimensional single-atomic-layer V2O3 with a honeycomb-Kagome
+structure is a QAH insulator with a large band gap (large than 0.1 eV) and a
+high ferromagnetic Curie temperature (about 900 K). Combining the
+first-principle calculations with the effective Hamiltonian analysis, we find
+that the spin-majority dxy and dyz orbitals of V atoms on the honeycomb lattice
+form a massless Dirac cone near the Fermi level which becomes massive when the
+on-site spin-orbit coupling is included. Interestingly, we find that the large
+band gap is caused by a cooperative effect of electron correlation and
+spin-orbit coupling. Both first-principle calculations and the effective
+Hamiltonian analysis confirm that 2D V2O3 has a non-zero Chern number (i.e.,
+one). Our work paves a new direction towards realizing the QAH effect at room
+temperature.",1702.07022v1
+2017-03-28,A general method to describe intersystem crossing dynamics in trajectory surface hopping,"Intersystem crossing is a radiationless process that can take place in a
+molecule irradiated by UV-Vis light, thereby playing an important role in many
+environmental, biological and technological processes. This paper reviews
+different methods to describe intersystem crossing dynamics, paying attention
+to semiclassical trajectory theories, which are especially interesting because
+they can be applied to large systems with many degrees of freedom. In
+particular, a general trajectory surface hopping methodology recently developed
+by the authors, which is able to include non-adiabatic and spin-orbit couplings
+in excited-state dynamics simulations, is explained in detail. This method,
+termed SHARC, can in principle include any arbitrary coupling, what makes it
+generally applicable to photophysical and photochemical problems, also those
+including explicit laser fields. A step-by-step derivation of the main
+equations of motion employed in surface hopping based on the fewest-switches
+method of Tully, adapted for the inclusion of spin-orbit interactions, is
+provided. Special emphasis is put on describing the different possible choices
+of the electronic bases in which spin-orbit can be included in surface hopping,
+highlighting the advantages and inconsistencies of the different approaches.",1703.09456v1
+2018-02-26,Drumhead surface states and their signatures in quasiparticle scattering interference,"We consider a two-orbital tight-binding model defined on a layered
+three-dimensional hexagonal lattice to investigate the properties of
+topological nodal lines and their associated drumhead surface states. We
+examine these surface states in centrosymmetric systems, where the bulk nodal
+lines are of Dirac type (i.e., four-fold degenerate), as well as in
+non-centrosymmetric systems with strong Rashba and/or Dresselhaus spin-orbit
+coupling, where the bulk nodal lines are of Weyl type (i.e., two-fold
+degenerate). We find that in non-centrosymmetric systems the nodal lines and
+their corresponding drumhead surface states are fully spin polarized due to
+spin-orbit coupling. We show that unique signatures of the topologically
+nontrivial drumhead surface states can be measured by means of quasiparticle
+scattering interference, which we compute for both Dirac and Weyl nodal line
+semimetals. At the end, we analyze the possible crystal structures with a
+symmetry that supports flat surface states which are effectively ringlike.",1802.09139v2
+2017-04-11,Spin-orbit coupling and rovibrational structure in the iododiacetylene radical cation by PFI-ZEKE photoelectron spectroscopy,"The photoelectron spectrum of the $\textrm{X}^{+}\,{}^{2}\Pi \leftarrow
+\textrm{X}\,{}^{1}\Sigma^{+}$ photoionising transition in iododiacetylene,
+HC$_4$I, has been recorded using pulsed-field-ionisation zero-kinetic-energy
+(PFI-ZEKE) photoelectron spectroscopy with partial resolution of the rotational
+structure. The first adiabatic ionisation energy of HC$_4$I and the spin-orbit
+splitting of the X$^{+}\,{}^{2}\Pi$ state of HC$_4$I$^+$ are determined as
+$E^{\textrm{ad}}_{\textrm{I}}/(hc) = 74470.7(2)$ cm$^{-1}$ and
+$\Delta\tilde{\nu}_{\textrm{so}} = 1916.7(4)$ cm$^{-1}$, respectively. Several
+vibrational levels of the X$^{+}\,{}^{2}\Pi$ electronic ground state of the
+HC$_4$I$^+$ cation have been observed. The experimental data are discussed in
+the realm of a simple three-state charge-transfer model without adjustable
+parameters which allows for a qualitative description of the electronic
+structure and spin-orbit coupling in HC$_4$I$^+$ and of the change in bond
+lengths upon ionisation of HC$_4$I.",1704.03280v1
+2018-05-06,Quantum Anomalous Hall Effect and Giant Rashba Spin-Orbit Splitting in Compensated n-p--Codoped Graphene,"Quantum anomalous Hall effect (QAHE) is a fundamental quantum transport
+phenomenon in condensed matter physics. Until now, the only experimental
+realization of the QAHE has been observed for Cr/V-doped (Bi,Sb)$_2$Te$_3$ but
+at extremely low observational temperature, thereby limiting its potential
+application in dissipationless quantum electronics. Employing first-principles
+calculations, we study the electronic structures of graphene codoped with
+5\textit{d} transition metal and boron (B) atoms based on a compensated
+\textit{n}--\textit{p} codoping scheme. Our findings are as follows. 1) The
+electrostatic attraction between the \textit{n}- and \textit{p}-type dopants
+effectively enhances the adsorption of metal adatoms and suppresses their
+undesirable clustering. 2) Hf--B and Os--B codoped graphene systems can
+establish long-range ferromagnetic order and open nontrivial band gaps because
+of the spin-orbit coupling with the non-vanishing Berry curvatures to host the
+QAHE. 3) The calculated Rashba splitting energy in Re--B and Pt--B codoped
+graphene systems can reach up to 158 and 85~meV, respectively, which is several
+orders of magnitude higher than the reported intrinsic spin-orbit coupling
+strength.",1805.02230v1
+2012-01-18,Electronic structure of LaBr3 from quasi-particle self-consistent GW calculations,"Rare-earth based scintillators in general and lanthanum bromide (LaBr_3) in
+particular represent a challenging class of materials due to pronounced
+spin-orbit coupling and subtle interactions between d and f states that cannot
+be reproduced by standard density functional theory (DFT). Here a detailed
+investigation of the electronic band structure of LaBr_3 using the
+quasi-particle self-consistent GW (QPscGW) method is presented. This
+parameter-free approach is shown to yield an excellent description of the
+electronic structure of LaBr_3. Specifically it is able to reproduce the band
+gap, the correct level ordering and spacing of the 4f and 5d states, as well as
+the spin-orbit splitting of La-derived states. The QPscGW results are
+subsequently used to benchmark several computationally less demanding
+techniques including DFT+U, hybrid exchange-correlation functionals, and the
+G_0W_0 method. Spin-orbit coupling is included self-consistently at each QPscGW
+iteration and maximally localized Wannier functions are used to interpolate
+quasi-particle energies. The QPscGW results provide an excellent starting point
+for investigating the electronic structure of excited states, charge
+self-trapping, and activator ions in LaBr_3 and related materials.",1201.3860v1
+2014-05-23,Magnetic Excitations in Spin-Orbit Coupled $d^4$ Mott Insulator on Square Lattice,"We study the magnetic order and excitations in strong spin-orbit coupled, Van
+Vleck-type, $d^4$ Mott insulators on a square lattice. Extending the previous
+work, we include the tetragonal crystal field splitting and explore its effects
+on magnetic phase diagram and magnon spectra. Two different ordered phases,
+with in-plane and out-of-plane orientation of the staggered moments, are found
+for the higher and lower values of the crystal field splitting, respectively.
+The magnetic excitation spectra for paramagnetic and magnetically ordered
+phases are calculated and discussed in the context of a candidate spin-orbit
+$d^4$ Mott insulator Ca$_2$RuO$_4$.",1405.6062v2
+2017-10-02,Accurate computations of Rashba spin-orbit coupling in interacting systems: from the Fermi gas to real materials,"We describe the treatment of Rashba spin-orbit coupling (SOC) in interacting
+many-fermion systems within the auxiliary-field quantum Monte Carlo framework,
+and present a set of illustrative results. These include numerically exact
+calculations on the ground-state properties of the spin-balanced, attractive
+two-dimensional Fermi gas, as well as a study of a tight-binding Hamiltonian
+with repulsive interaction. These systems are formally connected via the
+Hubbard Hamiltonian with SOC, but cover different physics ranging from
+superfluidity and triplet pairing to SOC in real materials in the presence of
+strong interactions in localized orbitals. We carry out detailed benchmark
+studies of the method in the latter case when an approximation is needed to
+control the sign problem for repulsive Coulomb interactions. The methods
+presented here provide an approach for predictive computations in materials to
+study the interplay of SOC and strong correlation.",1710.00887v1
+2018-09-10,Unified low-energy effective Hamiltonian and the band topology of $p$-block square-net layer derivatives,"In recent years, low-dimensional materials with tetragonal $P4/nmm$
+(orthorhombic $Pnma$) space group having square-net (chain-like) substructure
+of $p$-block elements have been studied extensively. By using a
+first-principles calculation and a two-sites $\otimes$ two-orbitals
+tight-binding model, we construct the unified low-energy effective Hamiltonian
+and the $\mathbb{Z}_{2}$ topological phase diagram for such materials with
+different filling factors. Near the chemical potential, we show that the
+staggered arrangement of ions at 2c (4c) site yields the virtual hopping that
+have the same form with the second nearest-neighbor hopping between the
+square-net (chain-like) ions. We show that this hybridization and low-symmetry
+of the chain-like structure protects the quantum spin Hall insulator phase.
+Finally, the second order spin-orbit coupling on top of the atomic spin-orbit
+coupling is considered to clarify the origin of the non-zero Berry phase
+signals reported in recent quantum oscillation experiments.",1809.03086v1
+2019-09-11,"Brightening odd-parity excitons in transition-metal dichalcogenides: Rashba spin-orbit interaction, skyrmions, and cavity polaritons","Odd-angular momentum exciton states are dark to light in monolayers of
+transition-metal dichalcogenides and can be addressed only by two-photon
+probes. Besides, $2p$ excitons states are expected to show a fine splitting
+that arises from the peculiar electronic band structure of the material,
+characterized by a finite Berry curvature around each valley. In this work we
+study in detail the coupling of photons to $p$ exciton states and we find that
+the Rashba spin-orbit interaction or a Skyrmion in the transition-metal
+dichalcogenide substrate can be exploited to engineer finite optical selection
+rules. The basis mechanism relies on a matching of the exciton angular momentum
+with the winding of the Rashba spin-orbit interaction or the Skyrmion
+topological charge. In a photonic cavity, the coupling is enhanced due to
+photon confinement and the resulting polaritonic branches acquire a mixing with
+$2p^\pm$ excitons, thus providing a useful tool to detect exciton
+fine-splitting and and enable novel uses of odd-parity dark excitons.",1909.05297v2
+2020-04-03,Interface Dark Excitons at Sharp Lateral Two-Dimensional Heterostructures,"We study the dark excitons at the interface of sharp lateral heterostructure
+of two-dimensional transition metal dichalcogenides. By introducing a
+low-energy effective Hamiltonian model, we find the energy dispersion relation
+of exciton and show how it depends on the onsite energy of composed materials
+and their spin-orbit coupling strengths. It is shown that the effect of
+geometrical structure of interface, as a deformation gauge field
+(pseudo-spin-orbit coupling), should be considered in calculating the binding
+energy of exciton. By discretization of real-space version of the dispersion
+relation on a triangular lattice, we show that the binding energy of exciton
+depends on its distance from the interface line. For exciton near the interface
+the binding energy is equal to 0.36 eV, while for the exciton enough far from
+the interface it is equal to 0.26 eV. Also, it has been shown that for zigzag
+interface the binding energy increases by 0.34 meV in comparison with the
+armchair interface due to the pseudo-spin-orbit interaction (gauge filed). The
+results can be used for designing the two-dimensional lateral heterostructure
+based optoelectronic devices and improving their characteristics.",2004.01381v3
+2018-07-05,Spin-Orbit Protection of Induced Superconductivity in Majorana Nanowires,"Spin-orbit interaction (SOI) plays a key role in creating Majorana zero modes
+in semiconductor nanowires proximity coupled to a superconductor. We track the
+evolution of the induced superconducting gap in InSb nanowires coupled to a
+NbTiN superconductor in a large range of magnetic field strengths and
+orientations. Based on realistic simulations of our devices, we reveal SOI with
+a strength of 0.15-0.35 eV$\require{mediawiki-texvc}\AA$. Our approach
+identifies the direction of the spin-orbit field, which is strongly affected by
+the superconductor geometry and electrostatic gates.",1807.01940v2
+2019-02-01,Two dimensional electron gas in the $δ$-doped iridates with strong spin-orbit coupling: La$_δ$Sr$_2$IrO$_4$,"Iridates are of considerable current interest because of the strong
+spin-orbit coupling that leads to a variety of new phenomena. Using
+density-functional studies, we predict the formation of a spin-orbital
+entangled two-dimensional electron gas (2DEG) in the $\delta$-doped iridate
+La$_\delta$Sr$_2$IrO$_4$, where a single SrO layer is replaced by a LaO layer.
+The extra La electron resides close to the $\delta$-doped layer, partially
+occupying the $J_{\rm eff}= 1/2 $ upper Hubbard band and thereby making the
+interface metallic. The magnetic structure of the bulk is destroyed near the
+interface, with the Ir$_0$ layer closest to the interface becoming
+non-magnetic, while the next layer (Ir$_1$) continues to maintain the AFM
+structure of the bulk, but with a reduced magnetic moment. The Fermi surface
+consists of a hole pocket and an electron pocket, located in two different Ir
+layers (Ir$_0$ and Ir$_1$), with both carriers derived from the $J_{\rm eff}=
+1/2 $ upper Hubbard band. The presence of both electrons and holes at the
+$\delta$-doped interface suggests unusual transport properties, leading to
+possible device applications.",1902.00578v1
+2019-02-14,Competing phases of interacting electrons on triangular lattices in moiré heterostructures,"We study the quantum many-body instabilities of interacting electrons with
+SU(2)$\times$SU(2) symmetry in spin and orbital degrees of freedom on the
+triangular lattice near van-Hove filling. Our work is motivated by effective
+models for the flat bands in hexagonal moir\'e heterostructures like twisted
+bilayer boron nitride and trilayer graphene-boron nitride systems. We consider
+an extended Hubbard model including onsite Hubbard and Hund's couplings, as
+well as nearest-neighbor exchange interactions and analyze the different
+ordering tendencies with the help of an unbiased functional renormalization
+group approach. We find three classes of instabilities controlled by the
+filling and bare interactions. For a nested Fermi surface at van-Hove filling,
+Hund-like couplings induce a weak instability towards spin or orbital density
+wave phases. An SU(4) exchange interaction moves the system towards a Chern
+insulator, which is robust with respect to perturbations from Hund-like
+interactions or deviations from perfect nesting. Further, in an extended range
+of fillings and interactions, we find topological $d\pm id$ and
+(spin-singlet)-(orbital-singlet) $f$-wave superconductivity.",1902.05350v1
+2019-04-04,Emergent non-Fermi-liquid phenomena in multipolar quantum impurity systems,"Discovery of novel spin-orbital entangled quantum ground states paves an
+important avenue for controllable quantum materials via unique couplings to the
+lattice and other external perturbations. In this work, motivated by recent
+experiments on cubic heavy fermion materials with multipolar local moments, we
+theoretically investigate strongly-interacting spin-orbital entangled quantum
+ground states in multipolar quantum impurity systems. Here itinerant electrons
+are interacting with the local moments carrying quadrupolar and octupolar
+moments, in contrast to the conventional Kondo problem with dipolar local
+moment. Using perturbative renormalization group methods, we uncover a number
+of non-Fermi liquid ground states, which are characterized by an absence of
+well-defined quasiparticles and singular power-law behaviours in physical
+properties. We show that the non-Fermi liquid states found here are outside the
+known categories of non-Fermi liquid states in the conventional multi-channel
+Kondo problem. This work lays a novel ground for the identification of
+unexpected non-Fermi liquid phases in many strongly spin-orbital-coupled
+quantum materials.",1904.02717v2
+2019-04-12,Optimized micromagnet geometries for Majorana zero modes in low g-factor materials,"Solid-state experimental realizations of Majorana bound states are based on
+materials with strong intrinsic spin-orbit interactions. In this paper, we
+explore an alternative approach where spin-orbit coupling is induced
+artificially through a nonuniform magnetic field that originates from an array
+of micromagnets. Using a recently developed optimization algorithm, we find
+suitable magnet geometries for the emergence of topological superconductivity
+in wires without intrinsic spin-orbit coupling. We confirm the robustness of
+Majorana bound states against disorder and periodic potentials whose amplitudes
+do not exceed the Zeeman energy. Furthermore, we identify low g-factor
+materials commonly used in mesoscopic physics experiments as viable candidates
+for Majorana devices.",1904.06275v2
+2019-11-09,Levitons in helical liquids with Rashba spin-orbit coupling probed by a superconducting contact,"We consider transport properties of a single edge of a two-dimensional
+topological insulators, in presence of Rashba spin-orbit coupling, driven by
+two external time-dependent voltages and connected to a thin superconductor. We
+focus on the case of a train of Lorentzian-shaped pulses, which are known to
+generate coherent single-electron excitations in two-dimensional electron gas,
+and prove that they are minimal excitations for charge transport also in
+helical edge states, even in the presence of spin-orbit interaction.
+Importantly, these properties of Lorentzian-shaped pulses can be tested
+computing charge noise generated by the scattering of particles at the thin
+superconductor. This represents a novel setup where electron quantum optics
+experiments with helical states can be implemented, with the superconducting
+contact as an effective beamsplitter. By elaborating on this configuration, we
+also evaluate charge noise in a collisional Hong-Ou-Mandel configuration,
+showing that, due to the peculiar effects induced by Rashba interaction, a
+non-vanishing dip at zero delay appears.",1911.03697v1
+2020-05-20,"Hubbard-Kanamori model: spectral functions, negative electron compressibility, and susceptibilities","The two-orbital Hubbard-Kanamori model is studied using the strong coupling
+diagram technique. This approach allows one to take into account the
+interactions of electrons with spin, charge, and orbital fluctuations of all
+ranges. It was found that, at low temperatures, the model has four regions of
+the negative electron compressibility, which can lead to charge inhomogeneities
+with the assistance of phonons. For half-filling, the phase diagram of the
+model contains regions of the Mott and Slater insulators, bad-metal, and states
+with spin-polaron peaks. These sharp peaks at the Fermi level are seen in doped
+states also. A finite Hund coupling leads to a large increase of
+antiferromagnetic spin correlations with strong suppression of charge and
+orbital fluctuations near half-filling. For moderate doping, all types of
+correlations become comparable. They peak at the antiferromagnetic wave vector
+except for a narrow region with an incommensurate response. Stronger doping
+destroys all correlations.",2005.09901v1
+2020-05-28,Multi-ultraflatbands tunability and effect of spin-orbit coupling in twisted bilayer transition metal dichalcogenides,"Ultraflatbands that have been theoretically and experimentally detected in a
+bunch of van der Waals stacked materials showing some peculiar properties, for
+instance, highly localized electronic states and enhanced electron-electron
+interactions. In this Letter, using an accurate tight-binding model, we study
+the formation and evolution of ultraflatbands in transition metal
+dichalcogenides (TMDCs) under low rotation angles. We find that, unlike in
+twisted bilayer graphene, ultraflatbands exist in TMDCs for almost any small
+twist angles and their wave function becomes more localized when the rotation
+angle decreases. Lattice relaxation, pressure and local deformation can tune
+the width of the flatbands, as well as their localization. Furthermore, we
+investigate the effect of spin-orbit coupling on the flatbands and discover
+spin/orbital/valley locking at the minimum of the conduction band at the K
+point of the Brillouin zone. The ultraflatbands found in TMDCs with a range of
+rotation angle below $7^\circ$, may provide an ideal platform to study strongly
+correlated states.",2005.13868v2
+2016-03-11,Atomic-scale control of magnetic anisotropy via novel spin-orbit coupling effect in La2/3Sr1/3MnO3/SrIrO3 superlattices,"Magnetic anisotropy (MA) is one of the most important material properties for
+modern spintronic devices. Conventional manipulation of the intrinsic MA, i.e.
+magnetocrystalline anisotropy (MCA), typically depends upon crystal symmetry.
+Extrinsic control over the MA is usually achieved by introducing shape
+anisotropy or exchange bias from another magnetically ordered material. Here we
+demonstrate a pathway to manipulate MA of 3d transition metal oxides (TMOs) by
+digitally inserting non-magnetic 5d TMOs with pronounced spin-orbit coupling
+(SOC). High quality superlattices comprised of ferromagnetic La2/3Sr1/3MnO3
+(LSMO) and paramagnetic SrIrO3 (SIO) are synthesized with the precise control
+of thickness at atomic scale. Magnetic easy axis reorientation is observed by
+controlling the dimensionality of SIO, mediated through the emergence of a
+novel spin-orbit state within the nominally paramagnetic SIO.",1603.03794v2
+2016-10-31,La-doping effect on spin-orbit coupled Sr2IrO4 probed by x-ray absorption spectroscopy,"Sr2IrO4 was predicted to be an unconventional superconductor upon carrier
+doping since it highly resembles the high-temperature cuprates. Here, to
+understand carrier doping effect on spin-orbit coupled Mott insulator Sr2IrO4,
+the electronic structure and local structure distortion for Sr2-xLaxIrO4 system
+have been investigated by x-ray absorption spectroscopy (XAS). By comparing the
+intensity of white-line features at the Ir L2,3 absorption edges, we observe
+remarkably large branching ratios in La-doped compounds, greater than that of
+the parent material Sr2IrO4, suggesting a strong spin-orbit interaction (SOI)
+for Sr2IrO4-based system. Moreover, extended x-ray absorption fine structure
+(EXAFS) spectra demonstrate more regular IrO6 octahedra, i.e. the weakened
+crystal electric field (CEF) versus La-doping. By theoretical calculations, the
+synergistic effect of regular IrO6 octahedra and electron doping is
+established, which accounts for the transition from a Mott insulator to a
+conductive state in Sr2-xLaxIrO4-based system.",1610.09839v1
+2016-12-07,Quantum phases of interacting three-component fermions under the influence of spin-orbit coupling and Zeeman fields,"We describe the quantum phases of interacting three component fermions in the
+presence of spin-orbit coupling, as well as linear and quadratic Zeeman fields.
+We classify the emerging superfluid phases in terms of the loci of zeros of
+their quasi-particle excitation spectrum in momentum space, and we identify
+several Lifshitz-type topological transitions. In the particular case of
+vanishing quadratic Zeeman field, a quintuple point exists where four gapless
+superfluid phases with surface and line nodes converge into a fully gapped
+superfluid phase. Lastly, we also show that the simultaneous presence of
+spin-orbit and Zeeman fields transforms a momentum-independent scalar order
+parameter into an explicitly momentum-dependent tensor in the generalized
+helicity basis.",1612.02365v1
+2017-07-05,Nuclear Structure Features of Gamow-Teller Excitations,"It is widely accepted that nuclear Gamow-Teller transitions are quenched;
+shell-model calculations also showed a clear anticorrelation between the
+Gamow-Teller strength and the transition rate of the collective quadrupole
+excitation from the ground state. We discuss the physics beyond this
+observation. It is based on the existence of spin-orbit coupling that is
+responsible for the non-zero probabilities of Gamow-Teller transitions in
+self-conjugate nuclei (N = Z). The shell-model calculations in the f p-space
+demonstrate the effects of the gradual artificial removal of the spin-orbit
+coupling that influences Gamow-Teller and quadrupole modes in opposite way. The
+realistic spin-orbit splitting moves the cumulative Gamow-Teller strength up
+and leads to stronger fragmentation; both trends are discussed in terms of
+simple symmetry arguments. Along with this process, the Gamow-Teller operator
+excites, in addition to the main line of L = 0 states, states with L = 2 which
+should be added, with the interference terms, to account for the total
+strength.",1707.01293v1
+2017-11-21,An efficient method for hybrid density functional calculation with spin-orbit coupling,"In first-principles calculations, hybrid functional is often used to improve
+accuracy from local exchange correlation functionals. A drawback is that
+evaluating the hybrid functional needs significantly more computing effort.
+When spin-orbit coupling (SOC) is taken into account, the non-collinear spin
+structure increases computing effort by at least eight times. As a result,
+hybrid functional calculations with SOC are intractable in most cases. In this
+paper, we present an approximate solution to this problem by developing an
+efficient method based on a mixed linear combination of atomic orbital (LCAO)
+scheme. We demonstrate the power of this method using several examples and we
+show that the results compare very well with those of direct hybrid functional
+calculations with SOC, yet the method only requires a computing effort similar
+to that without SOC. The presented technique provides a good balance between
+computing efficiency and accuracy, and it can be extended to magnetic
+materials.",1711.07640v2
+2017-11-29,p-wave superconductivity in weakly repulsive 2D Hubbard model with Zeeman splitting and weak Rashba spin-orbit coupling,"We study the superconducting order in a two-dimensional square lattice
+Hubbard model with weak repulsive interactions, subject to a Zeeman field and
+weak Rashba spin-orbit interactions. Diagonalizing the non-interacting
+Hamiltonian leads to two separate bands, and by deriving an effective
+low-energy interaction we find the mean field gap equations for the
+superconducting order parameter on the bands. Solving the gap equations just
+below the critical temperature, we find that superconductivity is caused by
+Kohn-Luttinger type interaction, while the pairing symmetry of the bands are
+indirectly affected by the spin-orbit coupling. The dominating attractive
+momentum channel of the Kohn-Luttinger term depends on the filling fraction $n$
+of the system, and it is therefore possible to change the momentum dependence
+of the order parameter by tuning $n$. Moreover, $n$ also determines which band
+has the highest critical temperature. Rotating the magnetic field changes the
+momentum dependence from states that for small momenta reduce to a chiral $p_x
+\pm i p_y$ type state for out-of-plane fields, to a nodal p-wave type state for
+purely in-plane fields.",1711.11047v2
+2019-06-07,Field-free switching of a Spin-orbit torque device aided by interlayer-coupling induced domain walls,"The spin-orbit torque device is promising as a candidate for next generation
+magnetic memory, while the static in-plane field needed to induce deterministic
+switching is a main obstacle for its application in highly integrated circuits.
+Instead of introducing effective field into the device, in this work we present
+an alternative way to achieve the field-free current-driven magnetization
+switching. By adding Tb/Co multilayers at two ends of the current channel,
+assisting domain wall is created by interlayer exchange coupling. The
+field-free deterministic switching is achieved by the movement of the domain
+wall driven by current. By loop shift measurement we find the driven force
+exerted on the domain wall is determined by the direction of the in-plane
+moment in the domain wall. Finally, we modify the device into a synthetic
+antiferromagnetic structure to solve the problem of reading out signal. The
+present work broadens the choice of field-free spin-orbit torque device design
+and clearly depicts the difference between two different switching mechanism.",1906.02938v1
+2020-03-20,Spin-orbit-coupled metal candidate PbRe2O6,"We study the lead rhenium oxide PbRe2O6 as a candidate spin-orbit-coupled
+metal (SOCM), which has attracted much attention as a testing ground for
+studying unconventional Fermi liquid instability associated with a large
+spin-orbit interaction. The compound comprises a stack of modulated honeycomb
+lattices made of Re5+ (5d2) ions in a centrosymmetric R-3m structure at room
+temperature. Resistivity, magnetic susceptibility, and heat capacity
+measurements using single crystals reveal two successive first-order phase
+transitions at Ts1 = 265 K and Ts2 = 123 K. At Ts1, the magnetic susceptibility
+is enormously reduced and a structural transition to a monoclinic structure
+takes place, while relatively small changes are observed at Ts2. Surprisingly,
+PbRe2O6 bears a close resemblance to another SOCM candidate Cd2Re2O7 despite
+crucial differences in the crystal structure and probably in the electronic
+structure, suggesting that PbRe2O6 is an SOCM.",2003.09051v1
+2021-01-14,Observation of Symmetry-Protected Dirac States in Nonsymmorphic $α$-Antimonene,"Two-dimensional (2D) Dirac states with linear band dispersion have attracted
+enormous interest since the discovery of graphene. However, to date, 2D Dirac
+semimetals are still very rare due to the fact that 2D Dirac states are
+generally fragile against perturbations such as spin-orbit couplings.
+Nonsymmorphic crystal symmetries can enforce the formation of Dirac nodes,
+providing a new route to establishing symmetry-protected Dirac states in 2D
+materials. Here we report the symmetry-protected Dirac states in nonsymmorphic
+alpha-antimonene. The antimonene was synthesized by the method of molecular
+beam epitaxy. Two Dirac cones with large anisotropy were observed by
+angle-resolved photoemission spectroscopy. The Dirac state in alpha-antimonene
+is of spin-orbit type in contrast to the spinless Dirac states in graphene. The
+result extends the 'graphene' physics into a new family of 2D materials where
+spin-orbit coupling is present.",2101.05793v3
+2021-05-25,Hartree-Fock study of the moiré Hubbard model for twisted bilayer transition metal dichalcogenides,"Twisted bilayer transition metal dichalcogenides have emerged as important
+model systems for the investigation of correlated electron physics because
+their interaction strength, carrier concentration, band structure, and
+inversion symmetry breaking are controllable by device fabrication, twist
+angle, and most importantly, gate voltage, which can be varied in situ. The low
+energy physics of some of these materials has been shown to be described by a
+""moir\'e Hubbard model"" generalized from the usual Hubbard model by the
+addition of strong, tunable spin orbit coupling and inversion symmetry
+breaking. In this work, we use a Hartree-Fock approximation to reach a
+comprehensive understanding of the moir\'e Hubbard model on the mean field
+level. We determine the magnetic and metal-insulator phase diagrams, and assess
+the effects of spin orbit coupling, inversion symmetry breaking, and the
+tunable van Hove singularity. We also consider the spin and orbital effects of
+applied magnetic fields. This work provides guidance for experiments and sets
+the stage for beyond mean-field calculations.",2105.11883v2
+2021-07-09,Two-dimensional ferromagnetic spin-orbital excitations in the honeycomb VI$_{3}$,"VI$_{3}$ is a ferromagnet with planar honeycomb sheets of bonded V$^{3+}$
+ions held together by van der Waals forces. We apply neutron spectroscopy to
+measure the two dimensional ($J/J_{c} \approx 17$) magnetic excitations in the
+ferromagnetic phase, finding two energetically gapped ($\Delta \approx k_{B}
+T_{c} \approx$ 55 K) and dispersive excitations. We apply a multi-level spin
+wave formalism to describe the spectra in terms of two coexisting domains
+hosting differing V$^{3+}$ orbital ground states built from contrasting
+distorted octahedral environments. This analysis fits a common nearest neighbor
+in-plane exchange coupling ($J$=-8.6 $\pm$ 0.3 meV) between V$^{3+}$ sites. The
+distorted local crystalline electric field combined with spin-orbit coupling
+provides the needed magnetic anisotropy for spatially long-ranged
+two-dimensional ferromagnetism in VI$_{3}$.",2107.04311v1
+2022-01-24,Hund's coupling and electronic anisotropy in the spin-density wave state of iron pnictides,"In the multiband systems, Hund's coupling ($J$) plays a significant role in
+the spin and charge excitations. We study the dependence of electronic
+anisotropy on $J$ in terms of Drude-weight along different directions as well
+as the orbital order in the four-fold symmetry broken spin-density wave state
+of iron pnictides. A robust behavior of the Drude-weight anisotropy within a
+small window around $J \sim 0.25U$ with $U$ as intraorbital Coulomb interaction
+is described in terms of orbital-weight distribution along the reconstructed
+Fermi surfaces. We also find that the ferro-orbital order increases with $J$ in
+the widely accepted regime for the latter, which is explained as a consequence
+of rising exchange field with an increase in magnetization.",2201.09808v1
+2022-03-14,Noncollinear antiferromagnetic textures driven high harmonic generation from magnetic dynamics in the absence of spin-orbit coupling,"We demonstrate the generation of high order harmonics in carrier pumping from
+precessing ferromagnetic or antiferromagnetic orders, excited via magnetic
+resonance, in the presence of topological antiferromagnetic textures. This
+results in an enhancement of the carrier dynamics by orders of magnitude.
+Interestingly, the generation process occurs in an intrinsic manner, and is
+solely governed by the interplay between the s-d exchange coupling underlying
+the noncollinear antiferromagnetic order and the dynamical s-d exchange
+parameter of the magnetic drive. Therefore, the relativistic spin-orbit
+interaction is not required for the emergence of high harmonics in the pumped
+currents. Accordingly, the noncollinear topological antiferromagnetic order is
+presented as an alternative to spin-orbit interaction for the purpose of
+harnessing high harmonic emission in carrier pumping. Our proposal initiates a
+tantalizing perspective for the exploitation of topological magnetic textures
+in the context of the highly active domain of ultrafast spintronics.",2203.07310v2
+2022-08-05,Field-controlled quantum anomalous Hall effect in electron-doped CrSiTe$_{ 3 }$ monolayer: a first-principles prediction,"We report Chern insulating phases emerging from a single layer of layered
+chalcogenide CrSiTe$_{3}$, a transition metal trichacogenides (TMTC) material,
+in the presence of charge doping. Due to strong hybridization with Te $p$
+orbitals, the spin-orbit coupling effect opens a finite band gap, leading to a
+nontrivial topology of the Cr $e_{\mathrm{g}}$ conduction band manifold with
+higher Chern numbers. Our calculations show that quantum anomalous Hall effects
+can be realized by adding one electron in a formula unit cell of
+Cr$_{2}$Si$_{2}$Te$_{6}$, equivalent to electron doping by
+2.36$\times$10$^{14}$ cm$^{-2}$ carrier density. Furthermore, the
+doping-induced anomalous Hall conductivity can be controlled by an external
+magnetic field via spin-orientation-dependent tuning of the spin-orbit
+coupling. In addition, we find distinct quantum anomalous Hall phases employing
+tight-binding model analysis, suggesting that CrSiTe$_{3}$ can be a fascinating
+new platform to realize Chern insulating systems with higher Chern numbers.",2208.02997v2
+2022-09-14,Optimization of the Femtosecond Laser Impulse for Excitation and the Spin-Orbit Mediated Dissociation in the NaRb Dimer,"We study the dynamics of multiple coupled states under the influence of an
+arbitrary time-dependent external field to investigate the femtosecond
+laser-driven excitation and the spin-orbit mediated dissociation in the NaRb
+dimer. In this process, the dimer is excited from the ground triplet state
+$1^3\Sigma^+$ to the $1^3\Pi$ state using the femtosecond laser impulse and the
+spin-orbit coupling between the $1^3\Pi$ and $2^1\Sigma^+$ states results in
+the singlet-triplet transition. The laser impulse parameters are optimised to
+obtain maximum yield in electronic states correlating with the first excited
+atomic asymptote. We observe the detailed population statistics and power-law
+decay of these states. Finally, the analysis of the population oscillations
+allows us to determine the optimal time delay for dumping the molecule to its
+absolute ground state.",2209.06863v3
+2022-12-21,Lattice vibrational modes in changchengite from Raman spectroscopy and first principles electronic structure,"We measured room-temperature phonon Raman spectra of changchengite (IrBiS)
+and compared the experimental phonon wavenumbers to the theoretical ones
+obtained by means of the \emph{ab initio} density-functional-theory
+calculations in the presence and absence of the spin-orbit coupling effects.
+Combining two different excitation photon energies all the symmetry predicted
+Raman modes are experimentally observed. The electronic properties of IrBiS are
+found to be similar to the recently studied isostructural compound IrBiSe
+showing a large Dresselhaus spin-orbit valence band splitting. A good agreement
+between the experimental and theoretically predicted Raman phonon wavenumbers
+is found only when the lattice parameter is constrained to the experimental
+value. The inclusion of the spin orbit coupling does not significantly affect
+the phonon wavenumbers.",2212.11349v1
+2023-01-25,Slave-spin mean field for broken-symmetry states: Néel antiferromagnetism and its phase separation in multi-orbital Hubbard models,"We introduce the generalization of the Slave-Spin Mean-Field method to
+broken-symmetry phases. Through a variational approach we derive the
+single-particle energy shift in the mean-field equations which generates the
+appropriate self-consistent field responsible for the stabilization of the
+broken symmetry. With this correction the different flavours of the slave-spin
+mean-field are actually the same method and they give identical results to
+Kotliar-Ruckenstein slave-bosons and to the Gutzwiller approximation. We apply
+our formalism to the N\'eel antiferromagnetic state and study it in
+multi-orbital models as a function of the number of orbitals and Hund's
+coupling strength, providing phase diagrams in the interaction-doping plane. We
+show that the doped antiferromagnet in proximity of half-filling is typically
+unstable towards insulator-metal and magnetic-non magnetic phase separation.
+Hund's coupling extends the range of this antiferromagnet, and favors its phase
+separation.",2301.10726v2
+2024-03-15,Thermoelectric performance of nano junctions subjected to microwave driven spin-orbit coupling,"Coherent charge and heat transport through periodically driven nanodevices
+provide a platform for studying thermoelectric effects on the nanoscale. Here
+we study a junction comprising a quantum dot connected to two fermionic
+terminals by two weak links. An AC electric field induces time-dependent
+spin-orbit interaction in the weak links. We show that this setup supports DC
+charge and heat currents and that thermoelectric performance can be improved,
+as reflected by the effect of the spin-orbit coupling on the Seebeck
+coefficient and the electronic thermal conductance. Our analysis is based on
+the nonequilibrium Keldysh Green's function formalism in the time domain and
+reveals an interesting distribution of the power supply from the AC source
+among the various components of the device, apparently not realized before.",2403.10264v1
+2024-03-21,Current density functional framework for spin-orbit coupling: Extension to periodic systems,"Spin-orbit coupling induces a current density in the ground state, which
+consequently requires a generalization for meta-generalized gradient
+approximations. That is, the exchange-correlation energy has to be constructed
+as an explicit functional of the current density and a generalized kinetic
+energy density has to be formed to satisfy theoretical constraints. Herein, we
+generalize our previously presented formalism of spin-orbit current density
+functional theory [Holzer et al., J. Chem. Phys. 157, 204102 (2022)] to
+non-magnetic and magnetic periodic systems of arbitrary dimension. Besides the
+ground-state exchange-correlation potential, analytical derivatives such as
+geometry gradients and stress tensors are implemented. The importance of the
+current density is assessed for band gaps, lattice constants, magnetic
+transitions, and Rashba splittings. For the latter, the impact of the current
+density may be larger than the deviation between different density functional
+approximations.",2403.14420v1
+2003-12-17,A Post-Newtonian diagnostic of quasi-equilibrium binary configurations of compact objects,"Using equations of motion accurate to the third post-Newtonian (3PN) order
+(O(v/c)^6 beyond Newtonian gravity), we derive expressions for the total energy
+E and angular momentum J of the orbits of compact binary systems (black holes
+or neutron stars) for arbitrary orbital eccentricity. We also incorporate
+finite-size contributions such as spin-orbit and spin-spin coupling, and
+rotational and tidal distortions, calculated to the lowest order of
+approximation, but we exclude the effects of gravitational radiation damping.
+We describe how these formulae may be used as an accurate diagnostic of the
+physical content of quasi-equilibrium configurations of compact binary systems
+of black holes and neutron stars generated using numerical relativity. As an
+example, we show that quasi-equilibrium configurations of corotating neutron
+stars recently reported by Miller et al. can be fit by our diagnostic to better
+than one per cent with a circular orbit and with physically reasonable tidal
+coefficients.",0312082v3
+2015-12-07,Novel Magnetic Quantization of sp$^{3}$ Bonding in Monolayer Tinene,"A generalized tight-binding model, which is based on the subenvelope
+functions of the different sublattices, is developed to explore the novel
+magnetic quantization in monolayer gray tin. The effects due to the $sp^{3}$
+bonding, the spin-orbital coupling, the magnetic field and the electric field
+are simultaneously taken into consideration. The unique magneto-electronic
+properties lie in two groups of low-lying Landau levels, with different orbital
+components, localization centers, state degeneracy, spin configurations, and
+magnetic- and electric-field dependences. The first and second groups mainly
+come from the $5p_{z}$ and ($5p_{x}$,$5p_{y}$) orbitals, respectively. Their
+Landau-level splittings are, respectively, induced by the electric field and
+spin-orbital interactions. The intragroup anti-crossings are only revealed in
+the former. The unique tinene Landau levels are absent in graphene, silicene
+and germanene.",1512.02129v1
+2022-12-06,Multipolar interactions and magnetic excitation gap in d$^3$ spin-orbit Mott insulators,"In Mott insulators with a half-filled $t_{2g}$ shell the Hund's rule coupling
+induces a spin-3/2 orbital-singlet ground state. The spin-orbit interaction is
+not expected to qualitatively impact low-energy degrees of freedom in such
+systems. Indeed, $d^3$ cubic double perovskites (DP) of heavy transition metals
+are believed to exhibit conventional collinear magnetic orders. However, their
+inelastic neutron scattering spectra feature large gaps of unclear origin. Here
+we derive first-principles low-energy Hamiltonians for the cubic DP
+Ba$_2$Y$B'$O$_6$ ($B'=$ Os, Ru) and show that they include significant
+multipolar - dipole-octupolar - intersite exchange terms. These terms break
+continuous symmetry of the spin-3/2 Hamiltonian opening an excitation gap. The
+calculated gap magnitudes are in good agreement with experiment. The
+dipole-octupolar intersite exchange is induced due to excited states of the
+$t_{2g}^3$ manifold that are admixed by the spin-orbit interaction into the
+spin-3/2 ground state.",2212.03358v3
+1999-12-29,"Competition between ferromagnetic and charge-orbital ordered phases in Pr$_{1-x}$Ca$_{x}$MnO$_3$ for $x$=1/4, 3/8, and 1/2","Spin, charge, and orbital structures in models for doped manganites are
+studied by a combination of analytic mean-field and numerical relaxation
+techniques. At realistic values for the electron-phonon and antiferromagnetic
+$t_{2g}$ spin couplings, a competition between a ferromagnetic (FM) phase and a
+charge-orbital ordered (COO) insulating state is found for $x$=1/4, 3/8, and
+1/2, as experimentally observed in Pr$_{1-x}$Ca$_{x}$MnO$_3$ for
+$x$=0.3$\sim$0.5. The theoretical predictions for the spin-charge-orbital
+ordering pattern are compared with experiments. The FM-COO energy difference is
+surprisingly small for the densities studied, result compatible with the
+presence of a robust colossal-magnetoresistive effect in
+Pr$_{1-x}$Ca$_{x}$MnO$_3$ in a large density interval.",9912469v1
+2004-03-25,XMCD characterization of rare-earth dopants in Ni$_{81}$Fe$_{19}$(50nm): microscopic basis of engineered damping,"We present direct evidence for the contribution of local orbital moments to
+the damping of magnetization precession in magnetic thin films. Using x-ray
+magnetic circular dichroism (XMCD) characterization of rare-earth (RE)
+M$_{4,5}$ edges in Ni$_{81}$Fe$_{19}$ doped with $<$ 2% Gd and Tb, we show that
+the enhancement of GHz precessional relaxation is accompanied by a significant
+orbital moment fraction on the RE site. Tb impurities, which enhance the
+Landau-Lifshitz(-Gilbert) LL(-G) damping $\lambda(\alpha)$, show a spin to
+orbital number ratio of 1.5$\pm$0.3; Gd impurities, which have no effect on
+damping, show a spin to orbital number ratio of zero within experimental error.
+The results indicate that the dopant-based control of magnetization damping in
+RE-doped ferromagnets is an atomistic effect, arising from spin-lattice
+coupling, and thus scalable to nanometer dimensions.",0403627v1
+2004-09-12,Quantum Versus Jahn-Teller Orbital Physics in YVO$_3$ and LaVO$_3$,"We argue that the large Jahn-Teller (JT) distortions in YVO$_3$ and LaVO$_3$
+should suppress the quantum orbital fluctuation. The unusual magnetic
+properties can be well explained based on LDA+$U$ calculations using
+experimental structures, in terms of the JT orbital. The observed splitting of
+the spin-wave dispersions for YVO$_3$ in C-type antiferromagnetic state is
+attributed to the inequivalent VO$_2$ layers in the crystal structure, instead
+of the ``orbital Peierls state''. Alternative stacking of $ab$-plane exchange
+couplings produces the c-axis spin-wave splitting, thus the spin system is
+highly three dimensional rather than quasi-one-dimensional. Similar splitting
+is also predicted for LaVO$_3$, although it is weak.",0409299v1
+2006-01-05,On-site approximation for spin-orbit coupling in LCAO density functional methods,"We propose a computational method that simplifies drastically the inclusion
+of spin-orbit interaction in density functional theory implemented on localised
+atomic orbital basis sets. Our method is based on a well-known procedure for
+obtaining pseudopotentials from atomic relativistic 'ab initio' calculations
+and on an on-site approximation for the spin-orbit matrix elements. We have
+implemented the technique in the SIESTA code, and we show that it provides
+accurate results for the overall band structure and splittings of group IV and
+III-IV semiconductors as well as for 5d metals.",0601093v3
+2009-01-11,"Unconventional Bose-Einstein Condensations Beyond the ""No-node"" Theorem","Feynman's ""no-node"" theorem states that the conventional many-body
+ground-state wavefunctions of bosons in the coordinate representation is
+positive-definite. This implies that time-reversal symmetry cannot be
+spontaneously broken. In this article, we review our progress in studying a
+class of new states of unconventional Bose-Einstein condensations beyond this
+paradigm. These states can either be the long-lived metal-stable states of
+ultra-cold bosons in high orbital bands in optical lattices as a result of the
+""orbital-Hund's rule"" interaction, or the ground states of spinful bosons with
+spin-orbit coupling linearly dependent on momentum. In both cases, Feynman's
+argument does not apply. The resultant many-body wavefunctions are
+complex-valued and thus break time-reversal symmetry spontaneously. Exotic
+phenomena in these states include the Bose-Einstein condensation at non-zero
+momentum, the ordering of orbital angular momentum moments, the half-quantum
+vortex, and the spin texture of skyrmions.",0901.1415v2
+2011-05-12,Coupled spin-lattice fluctuations in a compound with orbital degrees of freedom: the Cr based dimer system Sr3Cr2O8,"We report on an extended fluctuation regime in the spin dimer system Sr3Cr2O8
+based on anomalies in Raman active phonons and magnetic scattering. The
+compound has two characteristic temperatures, TS = 275 K, related to a
+Jahn-Teller transition with structural distortions and orbital ordering and a
+second, T*= 150 K, which is due to further changes in the orbital sector. Below
+TS quasielastic scattering marks strong fluctuations and in addition phonon
+anomalies are observed. For temperatures below T* we observe an exponential
+decrease of one phonon linewidth and determine a gap of the orbital
+excitations. At low temperatures the observation of two- and three-magnon
+scattering allows the determination of the spin excitation gap.",1105.2369v1
+2016-09-12,Hund's rule-driven Dzyaloshinskii-Moriya interaction at 3d-5d interfaces,"Using relativistic first-principles calculations, we show that the chemical
+trend of Dzyaloshinskii-Moriya interaction (DMI) in 3d-5d ultrathin films
+follows Hund's first rule with a tendency similar to their magnetic moments in
+either the unsupported 3d monolayers or 3d-5d interfaces. We demonstrate that,
+besides the spin-orbit coupling (SOC) effect in inversion asymmetric
+noncollinear magnetic systems, the driving force is the 3d orbital occupation
+and their spin flip/mixing processes with the spin-orbit active 5d states
+control directly the sign and magnitude of the DMI. The magnetic chirality
+changes are discussed in the light of the interplay between SOC, Hund's first
+rule, and the crystal field splitting of d orbitals.",1609.04004v1
+2017-10-09,Generation of a lattice of spin-orbit beams via coherent averaging,"We describe a highly robust method, applicable to both electromagnetic and
+matter-wave beams, that can produce a beam consisting of a lattice of orbital
+angular momentum (OAM) states coupled to a two-level system. We also define
+efficient protocols for controlling and manipulating the lattice
+characteristics. These protocols are applied in an experimental realization of
+a lattice of optical spin-orbit beams. The novel passive devices we demonstrate
+here are also a natural alternative to existing methods for producing
+single-axis OAM and spin-orbit beams. Our techniques provide new tools for
+investigations of chiral and topological materials with light and particle
+beams.",1710.03169v1
+2018-07-22,Ordering of hidden multipoles in spin-orbital entangled 5$d^{1}$ Ta chlorides,"Spin-orbit coupling of as large as a half eV for electrons in 5$d$ orbitals
+often gives rise to the formation of spin-orbital entangled objects,
+characterized by the effective total angular momentum $J_{eff}$. Of particular
+interest are the $J_{eff}$ = 3/2 states realized in 5$d^{1}$ transition metal
+ions surrounded by an anion octahedron. The pure $J_{eff}$ = 3/2 quartet does
+not have any magnetic dipolar moment (<$M$> = 0) but hosts hidden
+pseudo-dipolar moments accompanied by charge quadrupoles and magnetic
+octupoles. Cs$_2$TaCl$_6$ and Rb$_2$TaCl$_6$ are correlated insulators with
+5$d^{1}$ Ta$^{4+}$ ions in a regular Cl octahedron. Here we demonstrate that
+these Ta chlorides have a substantially suppressed effective magnetic dipolar
+moment of ~ 0.2 ${\mu}_B$. Two phase transitions are observed at low
+temperatures that are not pronounced in the magnetization but accompanied with
+large electronic entropy of $R$ln4. We ascribe the two transitions to the
+ordering of hidden multipoles.",1807.08311v2
+2020-05-04,Quantum Magnetism in Wannier-Obstructed Mott Insulators,"We develop a strong coupling approach towards quantum magnetism in Mott
+insulators for Wannier obstructed bands. Despite the lack of Wannier orbitals,
+electrons can still singly occupy a set of exponentially-localized but
+nonorthogonal orbitals to minimize the repulsive interaction energy. We develop
+a systematic method to establish an effective spin model from the electron
+Hamiltonian using a diagrammatic approach. The nonorthogonality of the Mott
+basis gives rise to multiple new channels of spin-exchange (or permutation)
+interactions beyond Hartree-Fock and superexchange terms. We apply this
+approach to a Kagome lattice model of interacting electrons in Wannier
+obstructed bands (including both Chern bands and fragile topological bands).
+Due to the orbital nonorthogonality, as parameterized by the nearest neighbor
+orbital overlap $g$, this model exhibits stable ferromagnetism up to a finite
+bandwidth $W\sim U g$, where $U$ is the interaction strength. This provides an
+explanation for the experimentally observed robust ferromagnetism in Wannier
+obstructed bands. The effective spin model constructed through our approach
+also opens up the possibility for frustrated quantum magnetism around the
+ferromagnet-antiferromagnet crossover in Wannier obstructed bands.",2005.01439v1
+2019-05-27,The Curious Case of NiRh$_2$O$_4$: A Spin-Orbit Entangled Diamond Lattice Paramagnet,"Motivated by the interest in topological quantum paramagnets in candidate
+spin-$1$ magnets, we investigate the diamond lattice compound NiRh$_2$O$_4$
+using {\it ab initio} theory and model Hamiltonian approaches. Our density
+functional study, taking into account the unquenched orbital degrees of
+freedom, shows stabilization of $S=1$ and $L=1$ state. We highlight the
+importance of spin-orbit coupling, in addition to Coulomb correlations, in
+driving the insulating gap, and uncover frustrating large second-neighbor
+exchange mediated by Ni-Rh covalency. A single-site model Hamiltonian
+incorporating the large tetragonal distortion is shown to give rise to a
+spin-orbit entangled non-magnetic ground state, largely accounting for the
+entropy, magnetic susceptibility, and inelastic neutron scattering results.
+Incorporating inter-site exchange within a slave-boson theory, we show that
+exchange frustration can suppress exciton condensation. We capture the
+dispersive gapped magnetic modes, uncover `dark states' invisible to neutrons,
+and make predictions for future experiments.",1905.11403v1
+2022-08-25,Anomalous Hall effect in antiferromagnetic perovskites,"We theoretically study the anomalous Hall effect (AHE) in perovskites with
+antiferromagnetic (AFM) orderings. By studying the multiorbital Hubbard model
+for $d$ electrons in perovskite transition metal oxides under the
+GdFeO$_3$-type distortion within the Hartree-Fock approximation, we investigate
+the behavior of intrinsic AHE owing to the atomic spin-orbit coupling via the
+linear response theory. We consider the cases where there exist two ($d^2$) and
+three ($d^3$) electrons in the $t_{2g}$ orbitals, and show that AFM ordered
+states can exhibit AHE. In the $d^2$ case, $C$-type AFM states give rise to dc
+AHE in metals and optical (finite-$\omega$) AHE in insulators accompanying
+orbital ordering, while in the $d^3$ case, a $G$-type AFM insulating state
+supports the optical AHE. By resolving the components in the spin patterns
+compatible with the space group symmetry, we specify the collinear AFM
+component to be responsible for the AHE, rather than the small ferromagnetic
+component. We discuss the microscopic origin of the AHE: the collinear AFM spin
+structure produces a nonzero Berry phase from the triangular units of the
+lattice, activated by the complex orbital mixing terms owing to the
+GdFeO$_3$-type distortion, and results in the microscopic Lorentz force.",2208.11823v1
+2020-01-21,Strong Spin-Orbit Quenching via the Product Jahn-Teller Effect in Neutral Group IV Artificial Atom Qubits in Diamond,"Artificial atom qubits in diamond have emerged as leading candidates for a
+range of solid-state quantum systems, from quantum sensors to repeater nodes in
+memory-enhanced quantum communication. Inversion-symmetric group IV vacancy
+centers, comprised of Si, Ge, Sn and Pb dopants, hold particular promise as
+their neutrally charged electronic configuration results in a ground-state spin
+triplet, enabling long spin coherence above cryogenic temperatures. However,
+despite the tremendous interest in these defects, a theoretical understanding
+of the electronic and spin structure of these centers remains elusive. In this
+context, we predict the ground- and excited-state properties of the neutral
+group IV color centers from first principles. We capture the product
+Jahn-Teller effect found in the excited state manifold to second order in
+electron-phonon coupling, and present a non-perturbative treatment of the
+effect of spin-orbit coupling. Importantly, we find that spin-orbit splitting
+is strongly quenched due to the dominant Jahn-Teller effect, with the lowest
+optically-active $^3E_u$ state weakly split into $m_s$-resolved states. The
+predicted complex vibronic spectra of the neutral group IV color centers are
+essential for their experimental identification and have key implications for
+use of these systems in quantum information science.",2001.07743v1
+2020-12-10,Counterintuitive gate dependence of weak antilocalization in bilayer graphene/WSe$_2$ heterostructures,"Strong gate control of proximity-induced spin-orbit coupling was recently
+predicted in bilayer graphene/transition metal dichalcogenides (BLG/TMDC)
+heterostructures, as charge carriers can easily be shifted between the two
+graphene layers, and only one of them is in close contact to the TMDC. The
+presence of spin-orbit coupling can be probed by weak antilocalization (WAL) in
+low field magnetotransport measurements. When the spin-orbit splitting in such
+a heterostructure increases with the out of plane electric displacement field
+$\bar D$, one intuitively expects a concomitant increase of WAL visibility. Our
+experiments show that this is not the case. Instead, we observe a maximum of
+WAL visibility around $\bar D=0$. This counterintuitive behaviour originates in
+the intricate dependence of WAL in graphene on symmetric and antisymmetric spin
+lifetimes, caused by the valley-Zeeman and Rashba terms, respectively. Our
+observations are confirmed by calculating spin precession and spin lifetimes
+from an $8\times 8$ model Hamiltonian of BLG/TMDC.",2012.05718v4
+2021-05-04,Topologically-driven three-spin chiral exchange interactions treated from first principles,"The mechanism behind the three-spin chiral interaction (TCI) included in the
+extended Heisenberg Hamiltonian and represented by an expression worked out
+recently (Phys.\ Rev.\ B, {\bf 101}, 174401 (2020)) is discussed. It is
+stressed that this approach provides a unique set of the multispin exchange
+parameters which are independent of each other either due to their different
+order of perturbation or due to different symmetry. This ensures in particular
+the specific properties of the TCI that were demonstrated previously via fully
+relativistic first principles calculations, and that result from the common
+influence of several issues not explicitly seen from the expression for the TCI
+parameters. Therefore, an interpretation of the TCI is suggested, showing
+explicitly its dependence on the relativistic spin-orbit coupling and on the
+topological orbital susceptibility (TOS). This is based on an expression for
+the TOS that is worked out on the same footing as the expression for the TCI.
+Using first-principles calculations we demonstrate in addition numerically the
+common topological properties of the TCI and TOS. To demonstrate the role of
+the relativistic spin-orbit coupling (SOC) for the TCI, a so-called
+topological' spin susceptibility (TSS) is introduced. This quantity
+characterizes the SOC induced spin magnetic moment on the atom in the presence
+of non-collinear magnetic structure, giving a connection between the TOS and
+TCI. Numerical results again support our conclusions.",2105.01653v2
+2023-05-25,Dzyaloshinskii-Moriya interaction in strongly spin-orbit-coupled systems: General formula and application to topological and Rashba materials,"We theoretically study the Dzyaloshinskii-Moriya interaction (DMI) mediated
+by band electrons with strong spin-orbit coupling (SOC). We first derive a
+general formula for the coefficient ${\bm D}_i$ of the DMI in free energy in
+terms of Green's functions, and examine its variations in relation to physical
+quantities. In general, the DMI coefficient can vary depending on physical
+quantities, i.e., whether one is looking at equilibrium spin structure (${\bm
+D}_i$) or spin-wave dispersion (${\bm D}_i^{(2)}$), and the obtained formula
+helps to elucidate their relations. By explicit evaluations for a magnetic
+topological insulator and a Rashba ferromagnet with perpendicular
+magnetization, we observe ${\bm D}_i^{(2)} \ne {\bm D}_i$ in general. In the
+latter model, or more generally, when the magnetization and the spin-orbit
+field are mutually orthogonal, ${\bm D}_i$ is exactly related to the
+equilibrium spin current for arbitrary strength of SOC, generalizing the
+similar relation for systems with weak SOC. Among various systems with strong
+SOC, magnetic Weyl semimetals are special in that ${\bm D}_i^{(2)} = {\bm
+D}_i$, and in fact, the DMI in this system arises as the chiral anomaly.",2305.16083v2
+1995-07-11,Quantum interference and the spin orbit interaction in mesoscopic normal-superconducting junctions,"We calculate the quantum correction to the classical conductance of a
+disordered mesoscopic normal-superconducting (NS) junction in which the
+electron spatial and spin degrees of freedom are coupled by an appreciable spin
+orbit interaction. We use random matrix theory to describe the scattering in
+the normal part of the junction and consider both quasi-ballistic and diffusive
+junctions. The dependence of the junction conductance on the Schottky barrier
+transparency at the NS interface is also considered. We find that the quantum
+correction is sensitive to the breaking of spin rotation symmetry even when the
+junction is in a magnetic field and time reversal symmetry is broken. We
+demonstrate that this sensitivity is due to quantum interference between
+scattering processes which involve electrons and holes traversing closed loops
+in the same direction. We explain why such processes are sensitive to the spin
+orbit interaction but not to a magnetic field. Finally we consider the effect
+of the spin orbit interaction on the phenomenon of ``reflectionless
+tunnelling.''",9507028v2
+2003-06-17,Relativistic Models for Binary Neutron Stars with Arbitrary Spins,"We introduce a new numerical scheme for solving the initial value problem for
+quasiequilibrium binary neutron stars allowing for arbitrary spins. The coupled
+Einstein field equations and equations of relativistic hydrodynamics are solved
+in the Wilson-Mathews conformal thin sandwich formalism. We construct sequences
+of circular-orbit binaries of varying separation, keeping the rest mass and
+circulation constant along each sequence. Solutions are presented for
+configurations obeying an n=1 polytropic equation of state and spinning
+parallel and antiparallel to the orbital angular momentum. We treat stars with
+moderate compaction ((m/R) = 0.14) and high compaction ((m/R) = 0.19). For all
+but the highest circulation sequences, the spins of the neutron stars increase
+as the binary separation decreases. Our zero-circulation cases approximate
+irrotational sequences, for which the spin angular frequencies of the stars
+increases by 13% (11%) of the orbital frequency for (m/R) = 0.14 ((m/R) = 0.19)
+by the time the innermost circular orbit is reached. In addition to leaving an
+imprint on the inspiral gravitational waveform, this spin effect is measurable
+in the electromagnetic signal if one of the stars is a pulsar visible from
+Earth.",0306075v2
+2018-07-28,Electronic transport and the related anomalous effects in silicene-like hexagonal lattice,"We investigate the anomalous effects due to the Berry correction and the
+considerable perturbations in the silicene-like hexagonal lattice system. The
+Berry curvature in periodic Bloch band system which related to the
+electromagnetic field is explored, the induced transverse anomalous velocity
+gives rise to the intrinsic Hall conductivity (without the vertex correction)
+expecially in the quantum anomalous Hall phase. The quantum anomalous Hall
+effect which related to the anomalous velocity term is detected, including the
+band avoided corssing effect and the generated special band gap. %{Enlarged
+Galilean symmetry of anyons and the Hall effect} The topological spin transport
+is affected by the Berry curvature %{Topological spin transport of a
+relativistic electron} %{Anomalous direction for skyrmion bubble motion} and
+the spin-current-induced Skyrmion spin texture motion is contrasted between the
+quantum spin Hall effect and quantum anomalous Hall effect. Since silicene
+involving the orbital degree of freedom, the orbital magnetic moment and
+orbital magnetization contributes significantly to the electronic transport
+properties of silicene %{Photoinduced quantum spin and valley Hall effects, and
+orbital magnetization in monolayer MoS2} as explored in this article. We also
+investigate the electronic tunneling properties of silicene in Josephon
+junction with the electric-field-induced Rashba-coupling, the anomalous effect
+due to the Berry phase is mentioned. Our results is meaningful to the
+application of the spintronics and valleytronics base on the silicene-like
+topological insulators.",1807.10898v1
+2020-05-19,Skew-scattering-induced giant antidamping spin-orbit torques: Collinear and out-of-plane Edelstein effects at two-dimensional material/ferromagnet interfaces,"Heavy metal/ferromagnet interfaces feature emergent spin-orbit effects absent
+in the bulk materials. Because of their inherent strong coupling between spin,
+charge and orbital degrees of freedom, such systems provide a platform for
+technologically sought-after spin-orbit torques (SOTs). However, the
+microscopic origin of purely interfacial antidamping SOT, especially in the
+ultimate atomically thin limit, has proven elusive. Here, using two-dimensional
+(2D) van der Waals materials as a testbed for interfacial phenomena, we address
+this problem by means of a microscopic framework accounting for band structure
+effects and impurity scattering on equal footing and nonperturbatively. A
+number of unconventional and measurable effects are predicted, the most
+remarkable of which is a giant enhancement of antidamping SOT in the dilute
+disorder limit induced by a robust skew scattering mechanism, which is
+operative in realistic interfaces and does not require magnetic impurities. The
+newly unveiled skew scattering mechanism activates rich semiclassical
+spin-charge conversion effects that have gone unnoticed in the literature,
+including a collinear Edelstein effect with nonequilibrium spin polarization
+aligned with the direction of the applied current.",2005.09670v2
+2019-08-13,Orbital transmutation and the electronic spectrum of FeSe in the nematic phase,"We consider the electronic spectrum near $M=(\pi,\pi)$ in the nematic phase
+of FeSe ($T<T_{{\rm nem}}$) and make a detailed comparison with recent ARPES
+and STM experiments. Our main focus is the unexpected temperature dependence of
+the excitations at the $M$ point. These have been identified as having $xz$ and
+$yz$ orbital character well below $T_{{\rm nem}}$, but remain split at
+$T>T_{{\rm nem}}$, in apparent contradiction to the fact that in the tetragonal
+phase the $xz$ and $yz$ orbitals are degenerate. Here we present two scenarios
+which can describe the data. In both scenarios, hybridization terms present in
+the tetragonal phase leads to an orbital transmutation, a change in the
+dominant orbital character of some of the bands, between $T > T_{\rm nem}$ and
+$T \ll T_{\rm nem}$. The first scenario relies on the spin-orbit coupling at
+the $M$ point. We show that a finite spin-orbit coupling gives rise to orbital
+transmutation, in which one of the modes, identified as $xz$ ($yz)$ at $T \ll
+T_{{\rm nem}}$, becomes predominantly $xy$ at $T > T_{{\rm nem}}$ and hence
+does not merge with the predominantly $yz$ ($xz$) mode. The second scenario,
+complementary to the first, takes into consideration the fact that both ARPES
+and STM are surface probes. In the bulk, a direct hybridization between the
+$xz$ and $yz$ orbitals is not allowed at the $M$ point, however, it is
+permitted on the surface. In the presence of a direct $xz/yz$ hybridization,
+the orbital character of the $xz/yz$ modes changes from pure $xz$ and pure $yz$
+at $T \ll T_{{\rm nem}}$ to $xz \pm yz$ at $T > T_{{\rm nem}}$, i.e., the two
+modes again have mono-orbital character at low $T$, but do not merge at
+$T_{{\rm nem}}$. We discuss how these scenarios can be distinguished in
+polarized ARPES experiments.",1908.04889v2
+2003-07-01,Spin Exciton in quantum dot with spin orbit coupling in high magnetic field,"Coulomb interactions of few ($ N $) electrons confined in a disk shaped
+quantum dot, with a large magnetic field $B=B^*$ applied in the z-direction
+(orthogonal to the dot), produce a fully spin polarized ground state. We
+numerically study the splitting of the levels corresponding to the multiplet of
+total spin $S=N/2$ (each labeled by a different total angular momentum $ J_z $)
+in presence of an electric field parallel to $ B $, coupled to $ S $ by a
+Rashba term. We find that the first excited state is a spin exciton with a
+reversed spin at the origin. This is reminiscent of the Quantum Hall
+Ferromagnet at filling one which has the skyrmion-like state as its first
+excited state. The spin exciton level can be tuned with the electric field and
+infrared radiation can provide energy and angular momentum to excite it.",0307016v2
+2006-03-02,Quantum Spin Hall Effect and Topologically Invariant Chern Numbers,"We present a topological description of quantum spin Hall effect (QSHE) in a
+two-dimensional electron system on honeycomb lattice with both intrinsic and
+Rashba spin-orbit couplings. We show that the topology of the band insulator
+can be characterized by a $2\times 2$ traceless matrix of first Chern integers.
+The nontrivial QSHE phase is identified by the nonzero diagonal matrix elements
+of the Chern number matrix (CNM). A spin Chern number is derived from the CNM,
+which is conserved in the presence of finite disorder scattering and spin
+nonconserving Rashba coupling. By using the Laughlin's gedanken experiment, we
+numerically calculate the spin polarization and spin transfer rate of the
+conducting edge states, and determine a phase diagram for the QSHE.",0603054v1
+2007-02-20,Magnification of spin Hall effect in bilayer electron gas,"Spin transport properties of a coupled bilayer electron gas with Rashba
+spin-orbit coupling are studied. The definition of the spin currents in each
+layer as well as the corresponding continuity-like equations in the bilayer
+system are given. The curves of the spin Hall conductivities obtained in each
+layer exhibit sharp cusps around a particular value of the tunnelling strength
+and the conductivities undergo sign changes across this point. Our
+investigation on the impurity effect manifests that an arbitrarily small
+concentration of nonmagnetic impurities does not suppress the spin Hall
+conductivity to zero in the bilayer system. Based on these features, an
+experimental scheme is suggested to detect a magnification of the spin Hall
+effect.",0702456v2
+2008-03-04,Magneto-Dielectric phenomena in charge and spin frustrated system of layered iron oxide,"Dielectric and magnetic phenomena in spin and charge frustrated system RFe2O4
+(R is a rare-earth metal ion) are studied. An electronic model for charge, spin
+and orbital degrees in a pair of triangular-lattice planes is derived. We
+analyze this model by utilizing the mean-field approximation and the
+Monte-Carlo simulation in a finite size cluster. A three fold-type charge
+ordered structure with charge imbalance between the planes is stabilized in
+finite temperatures. This polar charge order is reinforced by spin ordering of
+Fe ions. This novel magneto-dielectric phenomenon is caused by spin frustration
+and charge-spin coupling in the exchange interaction. We show cross-correlation
+effect in magnetic- and electric-field responses. Oxygen deficiency effect as
+an impurity effect in a frustrated charge-spin coupled system is also examined.",0803.0394v1
+2008-03-07,Understanding spin transport from the motion in SU(2)$\times$U(1) fields,"Starting from a continuum constituted by charged tops, we formulate the
+classical counterpart of a previously obtained covariant continuity-like
+equation for the spin current. Such a formulism provides an intuitive picture
+to elucidate the non-conservation of the spin current and to interpret the
+condition for the emergence of an infinite spin relaxation time. It also
+facilitates the discussion on the spin precession in a one-dimensional quantum
+wire with Dresselhaus and Rashba spin-orbit couplings. Furthermore, we derive
+the diffusion equations for both the charge and spin densities and find that
+they couple to each other due to the Zitterbewegung.",0803.1101v1
+2013-05-02,Coupled Spin and Pseudo-magnetic Field in Graphene Nanoribbons,"Pseudo-magnetic field becomes an experimental reality after the observation
+of zero-field Landau level-like quantization in strained graphene, but it is
+not expected that the time-reversal symmetric pseudo-magnetic fields will have
+any effect on the spin degree of freedom of the charge carriers. Here, we
+demonstrate that spin-orbit coupling (SOC) could act as a bridge between
+pseudo-magnetic field and spin. In quantum spin Hall (QSH) states, the
+direction of the spin of edge states is tied to their direction of motion
+because of the SOC. The pseudo-magnetic field affects the clockwise and
+counter-clock-wise edge currents of the QSH states, and consequently lifts the
+degenerate edge states of opposite spin orientation. Because of opposite signs
+of the pseudo-magnetic field in two valleys of graphene, the one-dimensional
+charge carriers at the two opposite edges have different group velocities, and
+in some special cases the edge states can only propagate at one edge of the
+nanoribbon and the group velocity at the other edge becomes zero.",1305.0335v2
+2013-05-27,Collinear and non-collinear spin ground state of wurtzite CoO,"Collinear and non-collinear spin structures of wurtzite phase CoO often
+appearing in nano-sized samples are investigated using first-principles density
+functional theory calculations. We examined the total energy of several
+different spin configurations, electronic structure and the effective magnetic
+coupling strengths. It is shown that the AF3-type antiferromagnetic ordering is
+energetically most stable among possible collinear configurations. Further, we
+found that a novel spiral spin order can be stabilized by including the
+relativistic spin-orbit coupling and the non-collinearity of spin direction.
+Our result suggests that a non-collinear spin ground state can be observed in
+the transition-metal-oxide nanostructures which adds an interesting new aspect
+to the nano-magnetism study.",1305.6496v1
+2014-07-16,Spin dynamics and magneto-optical response in charge-neutral tunnel-coupled quantum dots,"We model the electron and hole spin dynamics in an undoped double quantum dot
+structure, considering the carrier tunneling between quantum dots. Taking into
+account also the presence of an in-plane or tilted magnetic field, we provide
+the simulation of magneto-optical experiments, like the time resolved Kerr
+rotation measurement, which are performed currently on such structures to probe
+the temporal spin dynamics. With our model, we reproduce the experimentally
+observed effect of the extension of the spin polarization life time caused by
+the spatial charge separation, which may occur in structures of this type.
+Moreover, we provide a number of qualitative predictions concerning the
+necessary conditions for observation of this effect as well as about possible
+channels of its suppression, including the spin-orbit coupling, which leads to
+tunneling of carriers accompanied by a spin-flip. We consider also the impact
+of the magnetic field tilting, which results in an interesting spin
+polarization dynamics.",1407.4529v4
+2014-09-16,Phonon-modulated magnetic interactions and spin Tomonaga-Luttinger liquid in the p-orbital antiferromagnet CsO2,"The magnetic response of antiferromagnetic CsO2, coming from the p-orbital
+S=1/2 spins of anionic O2- molecules, is followed by 133Cs nuclear magnetic
+resonance across the structural phase transition occuring at Ts1=61 K on
+cooling. Above Ts1, where spins form a square magnetic lattice, we observe a
+huge, nonmonotonic temperature dependence of the exchange coupling originating
+from thermal librations of O2- molecules. Below Ts1, where antiferromagnetic
+spin chains are formed as a result of p-orbital ordering, we observe a spin
+Tomonaga-Luttinger-liquid behavior of spin dynamics. These two interesting
+phenomena, which provide rare simple manifestations of the coupling between
+spin, lattice and orbital degrees of freedom, establish CsO2 as a model system
+for molecular solids.",1409.4818v2
+2014-09-22,Donor Spin Qubits in Ge-based Phononic Crystals,"We propose qubits based on shallow donor electron spins in germanium.
+Spin-orbit interaction for donor spins in germanium is in many orders of
+magnitude stronger than in silicon. In a uniform bulk material it leads to very
+short spin lifetimes. However the lifetime increases dramatically when the
+donor is placed into a quasi-2D phononic crystal and the energy of the Zeeman
+splitting is tuned to lie within a phonon bandgap. In this situation single
+phonon processes are suppressed by energy conservation. The remaining
+two-phonon decay channel is very slow. The Zeeman splitting within the gap can
+be fine tuned to induce a strong, long-range coupling between the spins of
+remote donors via exchange by virtual phonons. This, in turn, opens a very
+efficient way to manipulate the quits. We explore various geometries of
+phononic crystals in order to maximize the coherent qubit-qubit coupling while
+keeping the decay rate minimal. We find that phononic crystals with unit cell
+sizes of 100-150 nm are viable candidates for quantum computing applications
+and suggest several spin-resonance experiments to verify our theoretical
+predictions.",1409.6285v1
+2015-01-25,Continuum model for chiral induced spin selectivity in helical molecules,"A minimal model is exactly solved for electron spin transport on a helix.
+Electron transport is assumed to be supported by well oriented $p_z$ type
+orbitals on base molecules forming a staircase of definite chirality. In a
+tight binding interpretation, the SOC opens up an effective $\pi_z-\pi_z$
+coupling via interbase $p_{x,y}-p_z$ hopping, introducing spin coupled
+transport. The resulting continuum model spectrum shows two Kramers doublet
+transport channels with a gap proportional to the SOC. Each doubly degenerate
+channel satisfies time reversal symmetry, nevertheless, a bias chooses a
+transport direction and thus selects for spin orientation. The model predicts
+which spin orientation is selected depending on chirality and bias, changes in
+spin preference as a function of input Fermi level and scattering suppression
+protected by the SO gap. We compute the spin current with a definite helicity
+and find it to be proportional to the torsion of the chiral structure and the
+non-adiabatic Aharonov- Anandan phase. To describe room temperature transport
+we assume that the total transmission is the result of a product of coherent
+steps limited by the coherence length.",1501.06201v1
+2015-03-12,Gate-control of spin-motive force and spin-torque in Rashba SOC systems,"The introduction of a strong Rashba spin orbit coupling (SOC) had been
+predicted to enhance the spin motive force (SMF) [see Phys. Rev. Lett. {\bf
+108}, 217202 (2012)]. In this work, we predict further enhancement of the SMF
+by time modulation of the Rashba coupling $\alpha_R$, which induces an
+additional electric field $E^R_d={\dot \alpha_R} m_e/e\hbar({\hat z}\times
+{\mathbf m})$. When the modulation frequency is higher than the magnetization
+precessing frequency, the amplitude of this field is significantly larger than
+previously predicted results. Correspondingly, the spin torque on the
+magnetization is also effectively enhanced. Additionally, the nature of SOC
+induced spin torque in the system can be transformed from damping to
+antidamping-like by modulating ${\dot \alpha_R}$. We also suggest a biasing
+scheme to achieve rectification of SMF, {\it i.e.}, by application of a square
+wave voltage at the resonant frequency. Finally, we numerically estimate the
+resulting spin torque field arising from a Gaussian pulse time modulation of
+$\alpha_R$.",1503.03651v2
+2016-01-20,Enhanced photonic spin Hall effect with subwavelength topological edge states,"Photonic structures offer unique opportunities for controlling light-matter
+interaction, including the photonic spin Hall effect associated with the
+transverse spin-dependent displacement of light that propagates in specially
+designed optical media. However, due to small spin-orbit coupling, the photonic
+spin Hall effect is usually weak at the nanoscale. Here we suggest
+theoretically and demonstrate experimentally, in both optics and microwave
+experiments, the photonic spin Hall effect enhanced by topologically protected
+edge states in subwavelength arrays of resonant dielectric particles. Based on
+direct near-field measurements, we observe the selective excitation of the
+topological edge states controlled by the handedness of the incident light.
+Additionally, we reveal the main requirements to the symmetry of photonic
+structures to achieve a topology-enhanced spin Hall effect, and also analyse
+the robustness of the photonic edge states against the long-ranged coupling.",1601.05264v1
+2017-08-14,Spin-resolved electronic structure of ferroelectric α-GeTe and multiferroic Ge1-xMnxTe,"Germanium telluride features special spin-electric effects originating from
+spin-orbit coupling and symmetry breaking by the ferroelectric lattice
+polarization, which opens up many prospectives for electrically tunable and
+switchable spin electronic devices. By Mn doping of the {\alpha}-GeTe host
+lattice, the system becomes a multiferroic semiconductor possessing
+magnetoelectric properties in which the electric polarization, magnetization
+and spin texture are coupled to each other. Employing spin- and angle-resolved
+photoemission spectroscopy in bulk- and surface-sensitive energy ranges and by
+varying dipole transition matrix elements, we disentangle the bulk, surface and
+surface-resonance states of the electronic structure and determine the spin
+textures for selected parameters. From our results, we derive a comprehensive
+model of the {\alpha}-GeTe surface electronic structure which fits experimental
+data and first principle theoretical predictions and we discuss the
+unconventional evolution of the Rashba-type spin splitting upon manipulation by
+external B- and E-fields.",1708.04104v1
+2019-09-23,Band splitting with vanishing spin polarizations in noncentrosymmetric crystals,"The Dresselhaus and Rashba effects are well-known phenomena in solid-state
+physics, in which spin-orbit coupling (SOC) splits spin-up and spin-down energy
+bands of nonmagnetic non-centrosymmetric crystals. Here, we discover a new
+phenomenon, dubbed as band splitting with vanishing spin polarizations (BSVSP),
+in which, as usual, SOC splits the energy bands in nonmagnetic
+non-centrosymmetric systems; surprisingly, however, both split bands show no
+net spin polarization along certain high-symmetry lines in the Brillouin zone.
+In order to rationalize this phenomenon, we propose a new classification of
+point groups into pseudo-polar and non-pseudo-polar groups. By means of
+first-principles simulations, we demonstrate that BSVSP can take place in both
+symmorphic (e.g., bulk GaAs) and non-symmorphic systems (e.g., two dimensional
+ferroelectric SnTe). Furthermore, we propose a novel linear magnetoelectric
+coupling in reciprocal space, which could be employed to tune the spin
+polarization with an external electric field. The BSVSP effect and its
+manipulation could therefore pave a new way to novel spintronic devices.",1909.10365v1
+2020-01-10,Transport-induced suppression of nuclear field fluctuations in multi-quantum-dot systems,"Magnetic noise from randomly fluctuating nuclear spin ensembles is the
+dominating source of decoherence for many multi-quantum-dot multielectron spin
+qubits. Here we investigate in detail the effect of a DC electric current on
+the coupled electron-nuclear spin dynamics in double and triple quantum dots
+tuned to the regime of Pauli spin blockade. We consider both systems with and
+without significant spin-orbit coupling and find that in all cases the flow of
+electrons can induce a process of dynamical nuclear spin polarization that
+effectively suppresses the nuclear polarization gradients over neighboring
+dots. Since exactly these gradients are the components of the nuclear fields
+that act harmfully in the qubit subspace, we believe that this presents a
+straightforward way to extend coherence times in multielectron spin qubits by
+at least one order of magnitude.",2001.03481v1
+2022-03-30,On the Origins of Life's Homochirality: Inducing Enantiomeric Excess with Spin-Polarized Electrons,"Life as we know it is homochiral, but the origins of biological homochirality
+on early Earth remain elusive. Shallow closed-basin lakes are a plausible
+prebiotic environment on early Earth, and most are expected to have significant
+sedimentary magnetite deposits. We hypothesize that UV (200-300nm) irradiation
+of magnetite deposits could generate hydrated spin-polarized electrons
+sufficient to induce chirally selective prebiotic chemistry. Such electrons are
+potent reducing agents that drive reduction reactions where the spin
+polarization direction can alter enantioselectively the reaction kinetics. Our
+estimate of this chiral bias is based on the strong effective spin-orbit
+coupling observed in the chiral-induced spin selectivity (CISS) effect, as
+applied to energy differences in reduction reactions for different isomers. In
+the original CISS experiments, spin selective electron transmission through a
+monolayer of dsDNA molecules is observed at room temperature - indicating a
+strong coupling between molecular chirality and electron spin. We propose that
+the chiral symmetry breaking due to the CISS effect, when applied to reduction
+chemistry, can induce enantioselective synthesis on the prebiotic Earth and
+thus facilitate the homochiral assembly of life's building blocks.",2203.16011v1
+2023-03-03,Impact of the $p$-cubic Dresselhaus term on the spin Hall effect,"It is well known that the Dresselhaus spin-orbit coupling (SOC) in
+semiconductor two dimensional electron gases (2DEGs) possesses both linear and
+cubic in momentum contributions. Nevertheless, the latter is usually neglected
+in most theoretical studies. However, recent Kerr rotation experiments have
+revealed a significant enhancement of the cubic Dresselhaus interaction by
+increasing the drift velocities in 2DEGs hosted in GaAs quantum wells. Here, we
+present a study of the optical spin Hall conductivity in 2DEGs under the
+simultaneous presence of Rashba and (linear plus cubic) Dresselhaus SOC. The
+work was done within the Kubo formalism in linear response. We show that the
+coexistence of the Rashba and cubic Dresselhaus SOC in 2DEGs promotes a strong
+anisotropy of the band spin splitting which in turn leads to a very
+characteristic frequency dependence of the spin Hall conductivity. We find that
+the spin Hall conductivity response could be very sensible to sizeable
+cubic-Dresselhaus coupling strength. This may be of relevance for the optical
+control of spin currents in 2DEGs with non-negligible cubic-Dresselhaus SOC.",2303.01941v1
+2023-06-08,Spin squeezing in mixed-dimensional anisotropic lattice models,"We describe a theoretical scheme for generating scalable spin squeezing with
+nearest-neighbour interactions between spin-1/2 particles in a 3D lattice,
+which are naturally present in state-of-the-art 3D optical lattice clocks. We
+propose to use strong isotropic Heisenberg interactions within individual
+planes of the lattice, forcing the constituent spin-1/2s to behave as large
+collective spins. These large spins are then coupled with XXZ anisotropic
+interactions along a third direction of the lattice. This system can be
+realized via superexchange interactions in a 3D optical lattice subject to an
+external linear potential, such as gravity, and in the presence of spin-orbit
+coupling (SOC) to generate spin anisotropic interactions. We show there is a
+wide range of parameters in this setting where the spin squeezing improves with
+increasing system size even in the presence of holes.",2306.05313v1
+2023-06-27,Spin-Polarized Photoelectrons in the Vicinity of Spectral Features,"We investigate the spin polarization of photoelectrons emitted from noble
+gases, in the vicinity of spectral features such as Fano resonances, Cooper
+minima, and giant resonances. Since these features all exhibit spatio-spectral
+coupling, they are intrinsically linked to the spin polarization through the
+spin-orbit coupling.
+  In contrast to c{\ae}sium, as originally proposed by Fano (1969)
+https://doi.org/10.1103/PhysRev.178.131, the rare gases do not provide large
+spin polarization in the vicinity of the Cooper minimum. However, the Fano
+resonances yield much higher spin polarization ($\ge40\%$). Furthermore, if the
+photoelectron is measured in coincidence with the photoion, 100\% spin
+polarization is possible, also close to the Cooper minimum.",2306.15665v1
+2022-06-20,Spin transfer torques due to the bulk states of topological insulators,"Spin torques at topological insulator (TI)/ferromagnet interfaces have
+received considerable attention in recent years with a view towards achieving
+full electrical manipulation of magnetic degrees of freedom. The most important
+question in this field concerns the relative contributions of bulk and surface
+states to the spin torque, a matter that remains incompletely understood.
+Whereas the surface state contribution has been extensively studied, the
+contribution due to the bulk states has received comparatively little
+attention. Here we study spin torques due to TI bulk states and show that: (i)
+There is no spin-orbit torque due to the bulk states on a homogeneous
+magnetisation, in contrast to the surface states, which give rise to a
+spin-orbit torque via the well-known Edelstein effect. (ii) The bulk states
+give rise to a spin transfer torque (STT) due to the inhomogeneity of the
+magnetisation in the vicinity of the interface. This spin transfer torque,
+which has not been considered in TIs in the past, is somewhat unconventional
+since it arises from the interplay of the bulk TI spin-orbit coupling and the
+gradient of the monotonically decaying magnetisation inside the TI. Whereas we
+consider an idealised model in which the magnetisation gradient is small and
+the spin transfer torque is correspondingly small, we argue that in real
+samples the spin transfer torque should be sizable and may provide the dominant
+contribution due to the bulk states. We show that an experimental smoking gun
+for identifying the bulk states is the fact that the field-like component of
+the spin transfer torque generates a spin density with the same size but
+opposite sign for in-plane and out-of-plane magnetisations. This distinguishes
+them from the surface states, which are expected to give a spin density of a
+similar size and the same sign for both an in-plane and out-of-plane
+magnetisations.",2206.09939v2
+2013-12-03,Orbital occupancies and the putative jeff = 1/2 groundstate in Ba2IrO4: a combined oxygen K edge XAS and RIXS study,"The nature of the electronic groundstate of Ba2IrO4 has been addressed using
+soft X-ray absorption and inelastic scattering techniques in the vicinity of
+the oxygen K edge. From the polarization and angular dependence of XAS we
+deduce an approximately equal superposition of xy, yz and zx Ir4+ 5d orbitals.
+By combining the measured orbital occupancies, with the value of the spin-orbit
+coupling provided by RIXS, we estimate the crystal field splitting associated
+with the tetragonal distortion of the IrO6 octahedra to be small, \Delta=50(50)
+meV. We thus conclude definitively that Ba2IrO4 is a close realization of a
+spin-orbit Mott insulator with a jeff = 1/2 groundstate, thereby overcoming
+ambiguities in this assignment associated with the interpretation of X-ray
+resonant scattering experiments.",1312.0857v1
+2016-11-28,Optical Properties of Monolayer Tinene in Electric Fields,"Monolayer tinene presents rich absorption spectra in electric fields. There
+are three kinds of special structures, namely shoulders, logarithmically
+symmetric peaks and asymmetric peaks in the square-root form, corresponding to
+the optical excitations of the extreme points, saddle points and
+constant-energy loops. With the increasing field strength, two splitting
+shoulder structures, which are dominated by the parabolic bands of ${5p_z}$
+orbitals, come to exist because of the spin-split energy bands. The frequency
+of threshold shoulder declines to zero and then linearly grows. The third
+shoulder at ${0.75 \sim 0.85}$ eV mainly comes from (${5p_x,5p_y}$) orbitals.
+The former and the latter orbitals, respectively, create the saddle-point
+symmetric peaks near the M point, while they hybridize with one another to
+generate the loop-related asymmetric peaks. Tinene quite differs from graphene,
+silicene, and germanene. The special relationship among the multi-orbital
+chemical bondings, spin-orbital couplings and Coulomb potentials accounts for
+the feature-rich optical properties.",1611.08999v1
+2023-04-19,Optoelectronic manifestation of orbital angular momentum driven by chiral hopping in helical Se chains,"Chiral materials have garnered significant attention in the field of
+condensed matter physics. Nevertheless, the magnetic moment induced by the
+chiral spatial motion of electrons in helical materials, such as elemental Te
+and Se, remains inadequately understood. In this work, we investigate the
+development of quantum angular momentum enforced by chirality using static and
+time-dependent density functional theory calculations for an elemental Se
+chain. Our findings reveal the emergence of an unconventional orbital texture
+driven by the chiral geometry, giving rise to a non-vanishing current-induced
+orbital moment. By incorporating spin-orbit coupling, we demonstrate that a
+current-induced spin accumulation arises in the chiral chain, which
+fundamentally differs from the conventional Edelstein effect. Furthermore, we
+demonstrate the optoelectronic detection of the orbital angular momentum in the
+chiral Se chain, providing a conceptually novel alternative to the interband
+Berry curvature, which is ill-defined in low dimensions.",2304.09364v3
+1999-05-14,Crossover Phenomena in the One-Dimensional SU(4) Spin-Orbit Model under Magnetic Fields,"We study the one-dimensional SU(4) exchange model under magnetic fields,
+which is the simplest effective Hamiltonian in order to investigate the quantum
+fluctuations concerned with the orbital degrees of freedom in coupled
+spin-orbit systems. The Bethe ansatz approaches and numerical calculations
+using the density matrix renormalization group method are employed. The main
+concern of the paper is how the system changes from the SU(4) to the SU(2)
+symmetric limit as the magnetic field is increased. For this model the
+conformal field theory predicts an usual behavior: there is a jump of the
+critical exponents just before the SU(2) limit. For a finite-size system,
+however, the orbital-orbital correlation functions approach continuously to the
+SU(2) limit after interesting crossover phenomena. The crossover takes place in
+the magnetization range of 1/3 $\sim$ 1/2 for the system with 72 sites studied
+in this paper.",9905211v1
+2009-01-14,Falling Transiting Extrasolar Giant Planets,"We revisit the tidal stability of extrasolar systems harboring a transiting
+planet and demonstrate that, independently of any tidal model, none but one
+(HAT-P-2b) of these planets has a tidal equilibrium state, which implies
+ultimately a collision of these objects with their host star. Consequently,
+conventional circularization and synchronization timescales cannot be defined
+because the corresponding states do not represent the endpoint of the tidal
+evolution. Using numerical simulations of the coupled tidal equations for the
+spin and orbital parameters of each transiting planetary system, we confirm
+these predictions and show that the orbital eccentricity and the stellar
+obliquity do not follow the usually assumed exponential relaxation but instead
+decrease significantly, reaching eventually a zero value, only during the final
+runaway merging of the planet with the star. The only characteristic evolution
+timescale of {\it all} rotational and orbital parameters is the lifetime of the
+system, which crucially depends on the magnitude of tidal dissipation within
+the star. These results imply that the nearly circular orbits of transiting
+planets and the alignment between the stellar spin axis and the planetary orbit
+are unlikely to be due to tidal dissipation. Other dissipative mechanisms, for
+instance interactions with the protoplanetary disk, must be invoked to explain
+these properties.",0901.2048v1
+2009-05-26,Compensated magnetism by design in double perovskite oxides,"Taking into account Goodenough's superexchange rules, including both full
+structural relaxation and spin-orbit coupling, and checking strong correlation
+effects, we look for compensated half metals within the class of oxide double
+perovskites materials. Identifying likely half metallic (or half semimetallic)
+antiferromagnets, the full complications including orbital magnetism are
+included in order to arrive at realistic predictions of designed magnetic
+compounds with (near) vanishing net moment. After sorting through several
+candidates that have not been considered previously, two materials,
+K$_2$MnRhO$_6$ and La$_2$CrWO$_6$, remain as viable candidates. An important
+factor is obtaining compounds either with very small induced orbital moment
+(helped by closed subshells) or with an orbital moment that compensates the
+spin-orbit driven degradation of half metallic character. While thermodynamic
+stability of these materials cannot be ensured, the development of
+layer-by-layer oxide deposition techniques does not require that materials be
+thermodynamically stable to be synthesized.",0905.4199v1
+2013-02-25,Quantized magnetic flux through the orbits of hydrogen-like atoms within the atomic model of Sommerfeld,"Within the Sommerfeld atomic model the quantization of magnetic flux through
+the electronic orbits is investigated together with its dependency on
+additional sources of magnetic fields. These sources alter the magnetic flux
+through the atomic orbits and in consequence are causing energy shifts. This
+effect is investigated for the cases, where the source is an external magnetic
+field, the magnetic moment of the nucleus or the magnetic moment of the
+electron. The energy shifts due to external magnetic fields, the magnetic
+dipole contribution of the hyperfine splitting and the spin-orbit coupling can
+be reproduced very well. The meaning of 'spin', however, changes within this
+approach drastically. The unusual Land\'e g-factor of 2 for the electron is a
+result of the orbital motion and the magnetic moment of the electron rather
+than it is an intrinsic property of the electron.",1302.6163v1
+2020-12-14,"Berry curvature, orbital magnetization, and Nernst effect in biased bilayer WSe$_2$","A valley-contrasting Berry curvature in bilayer transition metal
+dichalcogenides with spin-orbit coupling can generate valley magnetization when
+the inversion symmetry is broken, for example, by an electric field, regardless
+of time-reversal symmetry. A nontrivial Berry curvature can also lead to
+anomalous transport responses, such as the anomalous Hall effect and the
+anomalous Nernst effect. Applied to a bilayer WSe$_2$, an electric field can
+tune the Berry curvature and orbital magnetic moment, which has important
+consequences for the orbital magnetization and the anomalous Nernst responses.
+The orbital magnetization and its two contributions, one due to the magnetic
+moment and one due to the Berry curvature, are calculated and interpreted in
+terms of opposite circulating currents of the bands in the two layers. The
+valley anomalous Nernst coefficient and spin Nernst coefficient are also
+calculated. We find that a finite electric field leads to peaks and dips in the
+Nernst responses that have the signs of the Berry curvatures of the bands and
+are proportional to their magnitudes; it also enhances the valley Nernst
+responses. These experimentally verifiable findings may be promising for
+caloritronic applications.",2101.03185v1
+2021-02-11,Orbital Frustration and Emergent Flat Bands,"We expand the concept of frustration in Mott insulators and quantum spin
+liquids to metals with flat bands. We show that when inter-orbital hopping
+$t_2$ dominates over intra-orbital hopping $t_1$, in a multiband system with
+strong spin-orbit coupling $\lambda$, electronic states with a narrow bandwidth
+$W\sim t_2^2/\lambda$ are formed compared to a bandwidth of order $t_1$ for
+intra-orbital hopping. We demonstrate the evolution of the electronic
+structure, Berry phase distributions for time-reversal and inversion breaking
+cases, and their imprint on the optical absorption, in a tight binding model of
+$d$-orbital hopping on a honeycomb lattice. Going beyond quantum Hall effect
+and twisted bilayer graphene, we provide an alternative mechanism and a richer
+materials platform for achieving flat bands poised at the brink of
+instabilities toward novel correlated and fractionalized metallic phases.",2102.06302v2
+2022-03-29,Orbital Angular Momentum of Magnons in Collinear Magnets,"We study the orbital angular momentum of magnons for collinear ferromagnet
+(FM) and antiferromagnetic (AF) systems with nontrivial networks of exchange
+interactions. The orbital angular momentum of magnons for AF and FM zig-zag and
+honeycomb lattices becomes nonzero when the lattice contains two inequivalent
+sites and is largest at the avoided-crossing points or extremum of the
+frequency bands. Hence, the arrangement of exchange interactions may play a
+more important role at producing the orbital angular momentum of magnons than
+the spin-orbit coupling energy and the resulting non-collinear arrangement of
+spins.",2203.15677v3
+2024-03-08,Damping Obliquities of Hot Jupiter Hosts by Resonance Locking,"When orbiting hotter stars, hot Jupiters are often highly inclined relative
+to their host star equator planes. By contrast, hot Jupiters orbiting cooler
+stars are more aligned. Prior attempts to explain this correlation between
+stellar obliquity and effective temperature have proven problematic. We show
+how resonance locking -- the coupling of the planet's orbit to a stellar
+gravity mode (g mode) -- can solve this mystery. Cooler stars with their
+radiative cores are more likely to be found with g-mode frequencies increased
+substantially by core hydrogen burning. Strong frequency evolution in resonance
+lock drives strong tidal evolution; locking to an axisymmetric g mode damps
+semi-major axes, eccentricities, and as we show for the first time,
+obliquities. Around cooler stars, hot Jupiters evolve into spin-orbit alignment
+and avoid engulfment. Hotter stars lack radiative cores, and therefore preserve
+congenital spin-orbit misalignments. We focus on resonance locks with
+axisymmetric modes, supplementing our technical results with simple physical
+interpretations, and show that non-axisymmetric modes also damp obliquity.",2403.05616v1
+2007-08-30,Further insight into gravitational recoil,"We test the accuracy of our recently proposed empirical formula to model the
+recoil velocity imparted to the merger remnant of spinning, unequal-mass
+black-hole binaries. We study three families of black-hole binary
+configurations, all with mass ratio q=3/8 (to maximize the unequal-mass
+contribution to the kick) and spins aligned (or counter aligned) with the
+orbital angular momentum, two with spin configurations chosen to minimize the
+spin-induced tangential and radial accelerations of the trajectories
+respectively, and a third family where the trajectories are significantly
+altered by spin-orbit coupling. We find good agreement between the measured and
+predicted recoil velocities for the first two families, and reasonable
+agreement for the third. We also re-examine our original generic binary
+configuration that led to the discovery of extremely large spin-driven recoil
+velocities and inspired our empirical formula, and find reasonable agreement
+between the predicted and measured recoil speeds.",0708.4048v3
+2008-01-11,Magneto-spin Hall conductivity of a two-dimensional electron gas,"It is shown that the interplay of long-range disorder and in-plane magnetic
+field gives rise to an out-of-plane spin polarization and a finite spin Hall
+conductivity of the two-dimensional electron gas in the presence of Rashba
+spin-orbit coupling. A key aspect is provided by the electric-field induced
+in-plane spin polarization. Our results are obtained first in the
+\textit{clean} limit where the spin-orbit splitting is much larger than the
+disorder broadening of the energy levels via the diagrammatic evaluation of the
+Kubo-formula. Then the results are shown to hold in the full range of the
+disorder parameter $\alpha p_F \tau$ by means of the quasiclassical Green
+function technique.",0801.1786v1
+2010-04-26,Spin transfer in a ferromagnet-quantum dot and tunnel barrier coupled Aharonov-Bohm ring system with Rashba spin-orbit interactions,"The spin transfer effect in ferromagnet-quantum dot (insulator)-ferromagnet
+Aharonov-Bohm (AB) ring system with Rashba spin-orbit (SO) interactions is
+investigated by means of Keldysh nonequilibrium Green function method. It is
+found that both the magnitude and direction of the spin transfer torque (STT)
+acting on the right ferromagnet electrode can be effectively controlled by
+changing the magnetic flux threading the AB ring or the gate voltage on the
+quantum dot. The STT can be greatly augmented by matching a proper magnetic
+flux and an SO interaction at a cost of low electrical current. The STT,
+electrical current, and spin current are uncovered to oscillate with the
+magnetic flux. The present results are expected to be useful for information
+storage in nanospintronics.",1004.4507v1
+2015-01-30,Predominance of the Kitaev interaction in a three-dimensional honeycomb iridate: from ab-initio to spin model,"The recently discovered three-dimensional hyperhoneycomb iridate,
+$\beta$-Li$_2$IrO$_3$, has raised hopes for the realization of dominant Kitaev
+interaction between spin-orbit entangled local moments due to its near-ideal
+lattice structure. If true, this material may lie close to the sought-after
+quantum spin liquid phase in three dimensions. Utilizing ab-initio electronic
+structure calculations, we first show that the spin-orbit entangled basis,
+$j_{\rm eff}$=1/2, correctly captures the low energy electronic structure. The
+effective spin model derived in the strong coupling limit supplemented by the
+ab-initio results is shown to be dominated by the Kitaev interaction. We
+demonstrated that the possible range of parameters is consistent with a
+non-coplanar spiral magnetic order found in a recent experiment. All of these
+analyses suggest that $\beta$-Li$_2$IrO$_3$ may be the closest among known
+materials to the Kitaev spin liquid regime.",1502.00006v2
+2015-09-16,Charge-Induced Spin Torque in Anomalous Hall Ferromagnets,"We demonstrate that spin-orbit coupled electrons in a magnetically doped
+system exert a spin torque on the local magnetization, without a flowing
+current, when the chemical potential is modulated in a magnetic field. The spin
+torque is proportional to the anomalous Hall conductivity, and its effective
+field strength may overcome the Zeeman field. Using this effect, the direction
+of the local magnetization is switched by gate control in a thin film. This
+charge-induced spin torque is essentially an equilibrium effect, in contrast to
+the conventional current-induced spin-orbit torque, and, thus, devices using
+this operating principle possibly have higher efficiency than the conventional
+ones. In addition to a comprehensive phenomenological derivation, we present a
+physical understanding based on a model of a Dirac-Weyl semimetal, possibly
+realized in a magnetically doped topological insulator. The effect might be
+realized also in nanoscale transition materials, complex oxide ferromagnets,
+and dilute magnetic semiconductors.",1509.04799v1
+2015-10-15,Shaped electric fields for fast optimal manipulation of electron spin and position in a double quantum dot,"We use quantum optimal control theory algorithms to design external electric
+fields that drive the coupled spin and orbital dynamics of an electron in a
+double quantum dot, subject to the spin-orbit interaction and Zeeman magnetic
+fields. We obtain time-profiles of multi-frequency electric pulses which
+increase the rate of spin-flip transitions by several orders of magnitude in
+comparison with monochromatic fields, where the spin Rabi oscillations were
+predicted to be very slow. This precise, with the accuracy higher than
+$10^{-4}$, and fast, at the timescale of the order of 0.1 ns, simultaneous
+control of the electron spin orientation and position is achieved while keeping
+the electron in the four lowest tunneling- and Zeeman-split levels through the
+duration of the pulse, facilitating high fidelity and suggesting useful
+applications in spintronics and quantum information devices.",1510.04502v2
+2016-01-12,Improper magnetic ferroelectricity of nearly pure electronic nature in cycloidal spiral CaMn$_{7}$O$_{12}$,"The noncollinear cycloidal magnetic order breaks the inversion symmetry in
+CaMn$_{7}$O$_{12}$, generating one of the largest spin-orbit driven
+ferroelectric polarizations measured to date. In this Letter, the microscopic
+origin of the polarization, including its direction, charge density
+redistribution, magnetic exchange interactions, and its coupling to the spin
+helicity, is explored via first principles calculations. The Berry phase
+computed polarization exhibits almost pure electronic behavior, as the Mn
+displacements are negligible, $\approx$~0.7~m\textrm{\AA}. The polarization
+magnitude and direction are both determined by the Mn spin current, where the
+\emph{p}-\emph{d} orbital mixing is driven by the inequivalent exchange
+interactions within the \emph{B}-site Mn cycloidal spiral chains along each
+Cartesian direction. We employ the generalized spin-current model with
+Heisenberg-exchange Dzyaloshinskii-Moriya interaction energetics to provide
+insight into the underlying physics of this spin-driven polarization.
+Persistent electronic polarization induced by helical spin order in nearly
+inversion-symmetric ionic crystal lattices suggests opportunities for ultrafast
+magnetoelectric response.",1601.03020v1
+2016-06-17,Gate-voltage response of a one-dimensional ballistic spin valve without spin-orbit interaction,"We show that engineering of tunnel barriers forming at the interfaces of a
+one-dimensional spin valve provides a viable path to a strong gate-voltage
+tunability of the magnetoresistance effect. In particular, we investigate
+theoretically a carbon nanotube (CNT) spin valve in terms of the influence of
+the CNT-contact interface on the performance of the device. The focus is on the
+strength and the spin selectivity of the tunnel barriers that are modelled as
+Dirac-delta potentials. The scattering matrix approach is used to derive the
+transmission coefficient that yields the tunneling magnetoresistance (TMR). We
+find a strong non-trivial gate-voltage response of the TMR in the absence of
+spin-orbit coupling when the energy of the incident electrons matches the
+potential energy of the barrier. Analytic expressions for the TMR in various
+limiting cases are derived. These are used to explain previous experimental
+results, but also to predict parameters for device optimization with respect to
+size and tunability of the TMR effect in the ballistic transport regime.",1606.05571v2
+2016-06-28,Control of Spin Helix Symmetry in Semiconductor Quantum Wells by Crystal Orientation,"We investigate the possibility of spin-preserving symmetries due to the
+interplay of Rashba and Dresselhaus spin-orbit coupling in n-doped zinc-blende
+semiconductor quantum wells of general crystal orientation. It is shown that a
+conserved spin operator can be realized if and only if at least two
+growth-direction Miller indices agree in modulus. The according spin-orbit
+field has in general both in-plane and out-of-plane components and is always
+perpendicular to the shift vector of the corresponding persistent spin helix.
+We also analyze higher-order effects arising from the Dresselhaus term, and the
+impact of our results on weak (anti)localization corrections.",1606.08774v2
+2016-09-21,Creating spin-one fermions in the presence of artificial spin-orbit fields: Emergent spinor physics and spectroscopic properties,"We propose the creation and investigation of a system of spin-one fermions in
+the presence of artificial spin-orbit coupling, via the interaction of three
+hyperfine states of fermionic atoms to Raman laser fields. We explore the
+emergence of spinor physics in the Hamiltonian described by the interaction
+between light and atoms, and analyze spectroscopic properties such as
+dispersion relation, Fermi surfaces, spectral functions, spin-dependent
+momentum distributions and density of states. Connections to spin-one bosons
+and SU(3) systems is made, as well relations to the Lifshitz transition and
+Pomeranchuk instability are presented.",1609.06607v1
+2018-04-11,Theory of proximity effect in two-dimensional unconventional superconductor with Rashba spin-orbit interaction,"We study the anomalous proximity effect in diffusive normal metal
+(DN)/unconventional superconductor junctions, where the local density of states
+(LDOS) in the DN has a zero-energy peak due to the penetration of the
+odd-frequency spin-triplet $s$-wave pairing. In this study, we consider a
+two-dimensional unconventional superconductor on the substrate in the presence
+of a Rashba spin-orbit coupling (RSOC) $\lambda$, where the Rashba vector is
+parallel to the $z$-direction. The anomalous proximity effect, originally
+predicted in spin-triplet $p$-wave superconductor junctions, is sensitive to
+the RSOC. It disappears with the increase of $\lambda$. On the other hand, the
+anomalous proximity effect can be switched on by the large $\lambda$ values in
+the spin-singlet $d_{xy}$-wave superconductor junctions. The resulting
+zero-energy LDOS and the magnitude of the odd-frequency spin-triplet $s$-wave
+pair amplitude increase with the increase of $\lambda$.",1804.04018v3
+2018-11-01,Inversion-induced orbital and exchange disorders in antiferromagnetic A-site spinel CoAl2O4,"The inversion and volume effects on magnetism in a spinel-type magnetically
+frustrated compound, CoAl2O4, and its gallium-substituted system, CoAl2-xGaxO4,
+were investigated. Magnetically frustrated Co2+ with spin S = 3/2 on the
+tetrahedral site formed a diamond lattice in CoAl2O4 located in the vicinity of
+the magnetic phase boundary between Neel and spin-spiral states. In the
+Ga-substituted system, the number of Co ions, the so-called inversion h
+dominating the octahedral site, increased with increasing x. From comprehensive
+crystallographic, magnetic, and thermal measurements, increments of both volume
+and inversion strongly reduced the Neel point, while the latter also induced a
+spin-glass state above the critical value of hc = 0.09. In the spin glass
+state, h > hc, the orbital degree of freedom of Co2+ ions in the octahedral
+site appeared in the magnetic entropy, which couples strongly with that of
+spin, even above the magnetic transitions. Above h ~ hc, the field-induced
+quenched magnetic moment appeared above the transitions. Therefore, a short
+range ordered state emerged among the paramagnetic, antiferromganetic, and
+spin-glass states in the magnetic phase diagram.",1811.00186v1
+2018-05-15,Emergence of a Field-Driven U(1) Spin Liquid in the Kitaev Honeycomb Model,"In the field of quantum magnetism, the exactly solvable Kitaev honeycomb
+model serves as a paradigm for the fractionalization of spin degrees of freedom
+and the formation of $\mathbb{Z}_2$ quantum spin liquids. An intense
+experimental search has led to the discovery of a number of spin-orbit
+entangled Mott insulators that realize its characteristic bond-directional
+interactions and, in the presence of magnetic fields, exhibit no indications of
+long-range order. Here, we map out the complete phase diagram of the Kitaev
+model in tilted magnetic fields and report the emergence of a distinct gapless
+quantum spin liquid at intermediate field strengths. Analyzing a number of
+static, dynamical, and finite temperature quantities using numerical exact
+diagonalization techniques, we find strong evidence that this phase exhibits
+gapless fermions coupled to a massless $U(1)$ gauge field. We discuss its
+stability in the presence of perturbations that naturally arise in spin-orbit
+entangled candidate materials.",1805.05953v4
+2017-10-21,Spin interferometry in anisotropic spin-orbit fields,"Electron spins in a two-dimensional electron gas (2DEG) can be manipulated by
+spin-orbit (SO) fields originating from either Rashba or Dresselhaus
+interactions with independent isotropic characteristics. Together, though, they
+produce anisotropic SO fields with consequences on quantum transport through
+spin interference. Here we study the transport properties of modelled
+mesoscopic rings subject to Rashba and Dresselhaus [001] SO couplings in the
+presence of an additional in-plane Zeeman field acting as a probe. By means of
+1D and 2D quantum transport simulations we show that this setting presents
+anisotropies in the quantum resistance as a function of the Zeeman field
+direction. Moreover, the anisotropic resistance can be tuned by the Rashba
+strength up to the point to invert its response to the Zeeman field. We also
+find that a topological transition in the field texture that is associated with
+a geometric phase switching is imprinted in the anisotropy pattern. We conclude
+that resistance anisotropy measurements can reveal signatures of SO textures
+and geometric phases in spin carriers.",1710.07810v2
+2018-06-13,Deep-subwavelength features of photonic skyrmions in a confined electromagnetic field with orbital angular momentum,"In magnetic materials, skyrmions are nanoscale regions where the orientation
+of electron spin changes in a vortex-type manner. Here we show that spin-orbit
+coupling in a focused vector beam results in a skyrmion-like photonic spin
+distribution of the excited waveguided fields. While diffraction limits the
+spatial size of intensity distributions, the direction of the field, defining
+photonic spin, is not subject to this limitation. We demonstrate that the
+skyrmion spin structure varies on the deep-subwavelength scales down to 1/60 of
+light wavelength, which corresponds to about 10 nanometre lengthscale. The
+application of photonic skyrmions may range from high-resolution imaging and
+precision metrology to quantum technologies and data storage where the spin
+structure of the field, not its intensity, can be applied to achieve
+deep-subwavelength optical patterns.",1806.04827v1
+2020-10-21,Strong tuning of magnetism and electronic structure by spin orientation,"To efficiently manipulate magnetism is a key physical issue for modern
+condensed matter physics, which is also crucial for magnetic functional
+applications. Most previous relevant studies rely on the tuning of spin
+texture, while the spin orientation is often negligible. As an exception,
+spin-orbit coupled $J_{\rm eff}$ states of $4d$/$5d$ electrons provide an ideal
+platform for emergent quantum effects. However, many expectations have not been
+realized due to the complexities of real materials. Thus the pursuit for more
+ideal $J_{\rm eff}$ states remains ongoing. Here a near-ideal $J_{\rm
+eff}$=$3/2$ Mott insulating phase is predicted in the family of hexachloro
+niobates, which avoid some common drawbacks of perovskite oxides. The local
+magnetic moment is nearly compensated between spin and orbital components,
+rendering exotic recessive magnetism. More interestingly, the electronic
+structure and magnetism can be strongly tuned by rotating spin axis, which is
+rare but crucial for spintronic applications.",2010.10741v1
+2021-04-06,Spin-orbit enabled quantum transport channels in a two-hole double quantum dot,"We analyze experimentally and theoretically the transport spectra of a gated
+lateral GaAs double quantum dot containing two holes. The strong spin-orbit
+interaction present in the hole subband lifts the Pauli spin blockade and
+allows to map out the complete spectra of the two-hole system. By performing
+measurements in both source-drain voltage directions, at different detunings
+and magnetic fields, we carry out quantitative fitting to a Hubbard two-site
+model accounting for the tunnel coupling to the leads and the spin-flip
+relaxation process. We extract the singlet-triplet gap and the magnetic field
+corresponding to the singlet-triplet transition in the double-hole ground
+state. Additionally, at the singlet-triplet transition we find a resonant
+enhancement (in the blockaded direction) and suppression of current (in the
+conduction direction). The current enhancement stems from the multiple
+resonance of two-hole levels, opening several conduction channels at once. The
+current suppression arises from the quantum interference of spin-conserving and
+spin flipping tunneling processes.",2104.02568v1
+2021-05-24,Spin pumping of two-dimensional electron gas with Rashba and Dresselhaus spin-orbit interactions,"We theoretically consider spin pumping in a junction between a ferromagnetic
+insulator (FI) and a two-dimensional electron gas (2DEG) in which the Rashba
+and Dresselhaus spin-orbit interactions coexist. Using second-order
+perturbation theory, we derive an increase in linewidth in the case of an
+interfacial exchange coupling in a ferromagnetic resonance (FMR) experiment. We
+clarify how the enhancement of Gilbert damping depends on the resonant
+frequency and spin orientation of the FI. We show that this setup of an FMR
+experiment can provide information on the spin texture of 2DEG at the Fermi
+surface.",2105.11193v3
+2021-11-24,Spin Polarization through A Molecular Junction Based on Nuclear Berry Curvature Effects,"We explore the effects of spin-orbit coupling on nuclear wave packet motion
+near an out-of-equilibrium molecular junction, where nonzero Berry curvature
+emerges as the antisymmetric part of the electronic friction tensor. The
+existence of nonzero Berry curvature mandates that different nuclear wave
+packets (associated with different electronic spin states) experience different
+nuclear Berry curvatures, i.e. different pseudo-magnetic fields. Furthermore,
+for a generic, two-orbital two-lead model (representing the simplest molecular
+junction), we report significant spin polarization of the {\em electronic}
+current with decaying and oscillating signatures in the large voltage limit --
+all as a result of {\em nuclear} motion. These results are consistent with
+magnetic AFM chiral-induced spin selectivity experiments. Altogether, our
+results highlight an essential role for Berry curvature in condensed phase
+dynamics, where spin separation survives dissipation to electron-hole pair
+creation and emerges as one manifestation of nuclear Berry curvature.",2111.12815v2
+2022-05-26,Symmetry-resolved elastic anomalies in spin-crossover cobaltite LaCoO$_3$,"Ultrasound velocity measurements of the pseudo-cubic spin-crossover cobaltite
+LaCoO$_3$ and the lightly Ni-substituted La(Co$_{0.99}$Ni$_{0.01}$)O$_3$ reveal
+two types of symmetry-resolved elastic anomaly in the insulating paramagnetic
+state that are commonly observed in these compounds. The temperature dependence
+of the bulk modulus exhibits Curie-type softening upon cooling below 300 K down
+to $\sim$70 K, indicating the presence of isostructural lattice instability
+arising from orbital fluctuations. The temperature dependence of the tetragonal
+and trigonal shear moduli exhibits unusual hardening upon cooling below 300 K,
+indicating the occurrence of elasticity crossover arising from the spin
+crossover. The present study also reveals that the isostructural lattice
+instability in LaCoO$_3$ is sensitively suppressed with the Ni substitution,
+indicating the suppression of orbital fluctuations with the light Ni
+substitution. This Ni substitution effect in LaCoO$_3$ can be explained on the
+basis that the isostructural lattice instability arises from the coupling of
+the lattice to the Co spin state fluctuating between the high-spin state and
+intermediate-spin state.",2205.13228v3
+2007-01-18,Finite-size Effects in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interaction,"Within the Kubo formalism, we estimate the spin-Hall conductivity in a
+two-dimensional electron gas with Rashba spin-orbit interaction and study its
+variation as a function of disorder strength and system size. The numerical
+algorithm employed in the calculation is based on the direct numerical
+integration of the time-dependent Schrodinger equation in a spin-dependent
+variant of the particle source method. We find that the spin-precession length,
+L_s controlled by the strength of the Rashba coupling, establishes the critical
+lengthscale that marks the significant reduction of the spin-Hall conductivity
+in bulk systems. In contrast, the electron mean free path, inversely
+proportional to the strength of disorder, appears to have only a minor effect.",0701451v1
+2009-10-16,Anderson Impurity in Helical Metal,"We use a trial wave function to study the spin-1/2 Kondo effect of a helical
+metal on the surface of a three-dimensional topological insulator. While the
+impurity spin is quenched by conduction electrons, the spin-spin correlation of
+the conduction electron and impurity is strongly anisotropic in both spin and
+spatial spaces. As a result of strong spin-orbit coupling, the out-of-plane
+component of the impurity spin is found to be fully screened by the orbital
+angular momentum of the conduction electrons.",0910.3031v5
+2012-06-20,Spin Hall Conductivity on the Anisotropic Triangular Lattice,"We present a detailed study of the spin Hall conductivity on a
+two-dimensional triangular lattice in the presence of Rashba spin-orbit
+coupling. In particular, we focus part of our attention on the effect of the
+anisotropy of the nearest neighbor hopping amplitude. It is found that the
+presence of anisotropy has drastic effects on the spin Hall conductivity,
+especially in the hole doped regime where a significant increase or/and
+reversed sign of the spin Hall conductivity has been obtained. We also provide
+a systematic analysis of the numerical results in terms of Berry phases. The
+changes of signs observed at particular density of carriers appear to be a
+consequence of both Fermi surface topology and change of sign of electron
+velocity. In addition, in contrast to the two-dimensional square lattice, it is
+shown that the tight binding spin-orbit Hamiltonian should be derived carefully
+from the continuous model on the triangular lattice.",1206.4537v1
+2012-12-12,Spin-orbit induced chirality of Andreev states in Josephson junctions,"We study Josephson junctions (JJs) in which the region between the two
+superconductors is a multichannel system with Rashba spin-orbit coupling (SOC)
+where a barrier or a quantum point contact (QPC) is present. These systems
+might present unconventional Josephson effects such as Josephson currents for
+zero phase difference or critical currents that \textit{depend on} the current
+direction. Here, we discuss how the spin polarizing properties of the system in
+the normal state affect the spin characteristic of the Andreev bound states
+inside the junction. This results in a strong correlation between the spin of
+the Andreev states and the direction in which they transport Cooper pairs.
+While the current-phase relation for the JJ at zero magnetic field is
+qualitatively unchanged by SOC, in the presence of a weak magnetic field a
+strongly anisotropic behavior and the mentioned anomalous Josephson effects
+follow. We show that the situation is not restricted to barriers based on
+constrictions such as QPCs and should generically arise if in the normal system
+the direction of the carrier's spin is linked to its direction of motion.",1212.2786v1
+2018-05-28,Gravitational spin-orbit coupling in binary systems at the second post-Minkowskian approximation,"We compute the rotations, during a scattering encounter, of the spins of two
+gravitationally interacting particles at second-order in the gravitational
+constant (second post-Minkowskian order). Following a strategy introduced in
+Phys. Rev. D {\bf 96}, 104038 (2017), we transcribe our result into a
+correspondingly improved knowledge of the spin-orbit sector of the Effective
+One-Body (EOB) Hamiltonian description of the dynamics of spinning binary
+systems. We indicate ways of resumming our results for defining improved
+versions of spinning EOB codes which might help in providing a better
+analytical description of the dynamics of coalescing spinning binary black
+holes.",1805.10809v1
+2019-06-24,Octahedral tilting induced isospin reorientation transition in iridate heterostructures,"Iridate heterostructures are gaining interest as their magnetic properties
+are much more sensitive to structural distortion compared to pure spin systems
+due to spin-orbital entanglement induced by strong spin-orbit coupling. While
+bulk monolayer and bilayer iridates show $ab$-plane canted and $c$-axis
+antiferromagnetic (AFM) order, recent experiments on layered iridate
+superlattices (SL) have revealed striking properties, especially in the bilayer
+SL. A spin model is presented including the tilting induced Kitaev type
+interactions, which illustrates the proclivity towards $ab$-plane canted AFM
+order. A realistic Hubbard model including spin-dependent hopping terms arising
+from octahedral rotation and tilting is constructed for the bilayer SL in
+isospin space, and magnetic excitations are investigated in the
+self-consistently determined magnetic state. The Hubbard model analysis
+confirms the spin model results and shows strongly reduced magnon energy gap
+and an isospin reorientation transition from $c$-axis to $ab$-plane canted AFM
+order with increasing tilting.",1906.09879v2
+2022-08-03,Ultrafast Demagnetization Dynamics Due to Electron-Electron Scattering and Its Relation to Momentum Relaxation in Ferromagnets,"We analyze theoretically the demagnetization dynamics in a ferromagnetic
+model system due to the interplay of spin-orbit coupling and electron-electron
+Coulomb scattering. We compute the $k$-resolved electronic reduced spin-density
+matrix including precessional dynamics around internal spin-orbit and exchange
+fields as well as the electron-electron Coulomb scattering for densities and
+spin coherences. Based on a comparison with numerical solutions of the full
+Boltzmann scattering integrals, we establish that the $k$-resolved reduced
+spin-density matrix dynamics are well described using a simpler generalized
+relaxation-time ansatz for the reduced spin-density matrix. This ansatz allows
+one to relate the complicated scattering dynamics underlying the
+demagnetization dynamics to a physically meaningful momentum relaxation time
+$\tau$. Our approach reproduces the behaviors of the demagnetization time
+$\tau_{m} \propto 1/\tau$ and $\tau_{m} \propto \tau$ for the limits of short
+and long $\tau$, respectively, and is also valid for the intermediate regime.
+The ansatz thus provides a tool to include the correct demagnetization behavior
+in approaches that treat other contributions to the magnetization dynamics such
+as transport or magnon/phonon dynamics.",2208.02356v1
+2007-05-21,Non-Abelian hydrodynamics and the flow of spin in spin-orbit coupled substances,"Motivated by heavy ion collision experiments, we study the hydrodynamic
+properties of non-Abelian systems. These issues arise in condensed matter
+physics in the context of transport of spins in the presence of spin orbit
+coupling: the Pauli Hamiltonian governing the leading relativistic corrections
+in condensed matter systems can be rewritten in a language of SU(2) covariant
+derivatives, where the role of the non-Abelian gauge fields is taken by the
+physical electromagnetic fields. Taking a similar perspective as Jackiw and
+coworkers, we show that non-abelian hydrodynamical currents can be factored in
+a non-coherent 'classical' part, and a coherent part requiring macroscopic
+non-abelian quantum entanglement. Non-abelian flow being thus a much richer
+affair than familiar hydrodynamics, permits us to classify the various spin
+transport phenomena in in condensed matter physics in a unifying framework.In
+semiconductor spintronics, the absence of hydrodynamics is well known, but in
+our formulation it is directly associated with the fact that non-abelian
+currents are only covariantly conserved.We analyze the quantum mechanical
+single particle currents of relevance to mesoscopic transport with as highlight
+the Aharonov-Casher effect, where we demonstrate that the non-abelian transport
+structure renders it much more fragile than its abelian counterpart, the
+Aharonov-Bohm effect. We subsequently focus on spin flows protected by order
+parameters, of which the spin-spiral magnets and the spin superfluids are
+important examples. The surprising bonus is that the presence of an order
+parameter, being single-valued, restores hydrodynamics. We demonstrate a new
+effect: the trapping of electrical line charge, being the 'fixed frame'
+non-Abelian analogue of the familiar magnetic flux trapping by superconductors.",0705.2953v1
+2008-08-27,Torque and conventional spin-Hall currents in two-dimensional spin-orbit coupled systems: Universal relation and hyper-selection rule,"We investigate torque and also conventionally defined spin-Hall currents in
+two-dimensional (2D) spin-orbit coupled systems of spin-1/2 particles within
+the linear response Kubo formalism. We obtain some interesting relations
+between the conventional and torque spin-Hall conductivities for the generic
+effective Hamiltonian $H_0=\epsilon_k^0+A(k)\sigma_x-B(k)\sigma_y$, where
+$A(k)=\eta^A_ik_i+\eta^A_{ij}k_ik_j+\eta^A_{ijl}k_ik_jk_l+...$,
+$B(k)=\eta^B_ik_i+\eta^B_{ij}k_ik_j+\eta^B_{ijl}k_ik_jk_l+...$, and $\eta$'s
+are the specific system-dependent coefficients. Specifically, we find that in
+the intrinsic case the magnitude of torque spin-Hall conductivity
+$\sigma^{\tau_z}_{xy}(0)$ is always twice larger than the conventional
+spin-Hall conductivity $\sigma^{s_z}_{xy}(0)$, and the two conductivities have
+the opposite signs, i.e., $\sigma^{\tau_z}_{xy}(0)=-2\sigma^{s_z}_{xy}(0)$.
+This universal relation also holds in the presence of an uniform in-plane
+magnetic field. We also find that if the energy dispersion is rotationally
+invariant, there exists a hyper-angular momentum $I_z = (k\times
+\partial\theta/\partial k)_z s_z + L_z$ which is conserved. Furthermore, the
+hyper-angular momentum current $<{1/2}\{I_z,v_x\}>$ vanishes, and this leads to
+a hyper selection rule for the conventional spin-Hall current.",0808.3625v2
+2009-06-16,Hole spin relaxation in [001] strained asymmetric Si/SiGe and Ge/SiGe quantum wells,"Hole spin relaxation in [001] strained asymmetric Si/Si$_{0.7}$Ge$_{0.3}$
+(Ge/Si$_{0.3}$Ge$_{0.7}$) quantum wells is investigated in the situation with
+only the lowest hole subband being relevant. The effective Hamiltonian of the
+lowest hole subband is obtained by the subband L\""owdin perturbation method in
+the framework of the six-band Luttinger ${\bf k}\cdot{\bf p}$ model, with
+sufficient basis functions included. The lowest hole subband in Si/SiGe quantum
+wells is light-hole like with the Rashba spin-orbit coupling term depending on
+momentum both linearly and cubically, while that in Ge/SiGe quantum wells is a
+heavy hole state with the Rashba spin-orbit coupling term depending on momentum
+only cubically. The hole spin relaxation is investigated by means of the fully
+microscopic kinetic spin Bloch equation approach, with all the relevant
+scatterings considered. It is found that the hole-phonon scattering is very
+weak, which makes the hole-hole Coulomb scattering become very important. The
+hole system in Si/SiGe quantum wells is generally in the strong scattering
+limit, while that in Ge/SiGe quantum wells can be in either the strong or the
+weak scattering limit. The Coulomb scattering leads to a peak in both the
+temperature and hole density dependences of spin relaxation time in Si/SiGe
+quantum wells, located around the crossover between the degenerate and
+nondegenerate regimes. Nevertheless, the Coulomb scattering leads to not only a
+peak but also a valley in the temperature dependence of spin relaxation time in
+Ge/SiGe quantum wells.... (The remaining is omitted due to the limit of space).",0906.2865v2
+2017-08-09,Electrically driven electron spin resonance mediated by spin-valley-orbit coupling in a silicon quantum dot,"The ability to manipulate electron spins with voltage-dependent electric
+fields is key to the operation of quantum spintronics devices, such as
+spin-based semiconductor qubits. A natural approach to electrical spin control
+exploits the spin-orbit coupling (SOC) inherently present in all materials. So
+far, this approach could not be applied to electrons in silicon, due to their
+extremely weak SOC. Here we report an experimental realization of electrically
+driven electron-spin resonance in a silicon-on-insulator (SOI) nanowire quantum
+dot device. The underlying driving mechanism results from an interplay between
+SOC and the multi-valley structure of the silicon conduction band, which is
+enhanced in the investigated nanowire geometry. We present a simple model
+capturing the essential physics and use tight-binding simulations for a more
+quantitative analysis. We discuss the relevance of our findings to the
+development of compact and scalable electron-spin qubits in silicon.",1708.02903v2
+2017-08-23,Spin-memory loss due to spin-orbit coupling at ferromagnet/heavy-metal interfaces: Ab initio spin-density matrix approach,"Spin-memory loss (SML) of electrons traversing
+ferromagnetic-metal/heavy-metal (FM/HM), FM/normal-metal (FM/NM) and HM/NM
+interfaces is a fundamental phenomenon that must be invoked to explain
+consistently large number of spintronic experiments. However, its strength
+extracted by fitting experimental data to phenomenological semiclassical
+theory, which replaces each interface by a fictitious bulk diffusive layer, is
+poorly understood from a microscopic quantum framework and/or materials
+properties. Here we describe an ensemble of flowing spin quantum states using
+spin-density matrix, so that SML is measured like any decoherence process by
+the decay of its off-diagonal elements or, equivalently, by the reduction of
+the magnitude of polarization vector. By combining this framework with density
+functional theory (DFT), we examine how all three components of the
+polarization vector change at Co/Ta, Co/Pt, Co/Cu, Pt/Cu and Pt/Au interfaces
+embedded within Cu/FM/HM/Cu vertical heterostructures. In addition, we use ab
+initio Green's functions to compute spectral functions and spin textures over
+FM, HM and NM monolayers around these interfaces which quantify interfacial
+spin-orbit coupling and explain the microscopic origin of SML in long-standing
+puzzles, such as why it is nonzero at Co/Cu interface; why it is very large at
+Pt/Cu interface; and why it occurs even in the absence of disorder, intermixing
+and magnons at the interface.",1708.07105v3
+2018-02-28,Spin-dependent magneto-thermopower of narrow-gap lead chalcogenide quantum wells,"A semi-classical analysis of magneto-thermopower behaviour, namely, the
+\textit{Seebeck} and \textit{Nernst} effect (NE) in quantum wells of IV-VI lead
+salts with significant extrinsic Rashba spin-orbit coupling (RSOC) is performed
+in this report. In addition to the spin-dependent Seebeck effect that has been
+observed before, we also theoretically predict a similar spin-delineated
+behaviour for its thermal analog, the spin-dependent NE. The choice of lead
+salts follows from a two-fold advantage they offer, in part, to their superior
+thermoelectric properties, especially PbTe, while their low band gaps and high
+spin-orbit coupling make them ideal candidates to study \textit{RSOC} in
+nanostructures. The calculations show a larger longitudinal magneto-thermopower
+for the spin-up electrons while the transverse components are nearly identical.
+In contrast, for a magnetic field free case, the related power factor
+calculations reveal a significantly higher contribution from the spin-down
+ensemble and suffer a reduction with an increase in the electron density. We
+also discuss qualitatively the limitations of the semi-classical approach for
+the extreme case of a high magnetic field and allude to the observed
+thermopower behaviour when the quantum Hall regime is operational. Finally,
+techniques to modulate the thermopower are briefly outlined.",1802.10350v1
+2018-11-30,Dynamical precession of spin in the two-dimensional spin-orbit coupled systems,"We investigate the spin dynamics in the two-dimensional spin-orbit coupled
+system subject to an in-plane ($x$-$y$ plane) constant electric field, which is
+assumed to be turned on at the moment $t=0$. The equation of spin precession in
+linear response to the switch-on of the electric field is derived in terms of
+Heisenberg's equation by the perturbation method up to the first order of the
+electric field. The dissipative effect, which is responsible for bringing the
+dynamical response to an asymptotic result, is phenomenologically implemented
+\`{a} la the Landau-Lifshitz-Gilbert equation by introducing damping terms upon
+the equation of spin dynamics. Mediated by the dissipative effect, the
+resulting spin dynamics asymptotes to a stationary state, where the spin and
+the momentum-dependent effective magnetic field are aligned again and have
+nonzero components in the out-of-plane ($z$) direction. In the linear response
+regime, the asymptotic response obtained by the dynamical treatment is in full
+agreement with the stationary response as calculated in the Kubo formula, which
+is a time-independent approach treating the applied electric field as
+completely time-independent. Our method provides a new perspective on the
+connection between the dynamical and stationary responses.",1811.12626v2
+2016-08-18,Spin drift and diffusion in one- and two-subband helical systems,"The theory of spin drift and diffusion in two-dimensional electron gases is
+developed in terms of a random walk model incorporating Rashba, linear and
+cubic Dresselhaus, and intersubband spin-orbit couplings. The additional
+subband degree of freedom introduces new characteristics to the persistent spin
+helix (PSH) dynamics. As has been described before, for negligible intersubband
+scattering rates, the sum of the magnetization of independent subbands leads to
+a checkerboard pattern of crossed PSHs with long spin lifetime. For strong
+intersubband scattering we model the fast subband dynamics as a new random
+variable, yielding a dynamics set by averaged spin-orbit couplings of both
+subbands. In this case the crossed PSH becomes isotropic, rendering circular
+(Bessel) patterns with short spin lifetime. Additionally, a finite drift
+velocity breaks the symmetry between parallel and transverse directions,
+distorting and dragging the patterns. We find that the maximum spin lifetime
+shifts away from the PSH regime with increasing drift velocity. We present
+approximate analytical solutions for these cases and define their domain of
+validity. Effects of magnetic fields and initial package broadening are also
+discussed.",1608.05437v2
+2020-09-30,Pathways for producing binary black holes with large misaligned spins in the isolated formation channel,"Binary black holes (BBHs) can form from the collapsed cores of isolated
+high-mass binary stars. The masses and spins of these BBHs are determined by
+the complicated interplay of phenomena such as tides, winds, accretion,
+common-envelope evolution (CEE), supernova natal kicks, and stellar
+core-envelope coupling. The gravitational waves emitted during the mergers of
+BBHs depend on their masses and spins and can thus constrain these phenomena.
+We present a simplified model of binary stellar evolution and identify regions
+of the parameter space that produce BBHs with large spins misaligned with their
+orbital angular momentum. In Scenario A (B) of our model, stable mass transfer
+(SMT) occurs after Roche-lobe overflow (RLOF) of the more (less) massive star,
+while CEE follows RLOF of the less (more) massive star. Each scenario is
+further divided into Pathways 1 and 2 depending on whether the core of the more
+massive star collapses before or after RLOF of the less massive star,
+respectively. If the stellar cores are coupled weakly to their envelopes,
+highly spinning BBHs can be produced if natal spins greater than $10\%$ of the
+breakup value are inherited from the stellar progenitors. BBHs can
+alternatively acquire large spins by tidal synchronization during the
+Wolf-Rayet stage in Scenario A or by accretion onto the initially more massive
+star during SMT in Scenario B. BBH spins can be highly misaligned if the kicks
+are comparable to the orbital velocity, which is more easily achieved in
+Pathway A1 where the kick of the more massive star precedes CEE.",2010.00078v2
+2022-02-20,Effective spin model in momentum space: Toward a systematic understanding of multiple-$Q$ instability by momentum-resolved anisotropic exchange interactions,"Multiple-$Q$ magnetic states, such as a skyrmion crystal, become a source of
+unusual transport phenomena and dynamics. Recent theoretical and experimental
+studies clarify that such multiple-$Q$ states ubiquitously appear under
+different crystal structures in metals and insulators. Toward a systematic
+understanding of the formation of the multiple-$Q$ states in various crystal
+systems, in this theoretical study, we present a low-energy effective spin
+model with anisotropic exchange interactions in momentum space. We summarize
+specific six symmetry rules for nonzero symmetric and antisymmetric anisotropic
+exchange interactions in momentum space, which are regarded as an extension of
+Moriya's rule. According to the rules, we construct the effective spin model
+for tetragonal, hexagonal, and trigonal magnets with crystal- and
+momentum-dependent anisotropic exchange interactions based on magnetic
+representation analysis. Furthermore, we describe the origin of the effective
+anisotropic exchange interactions in itinerant magnets by perturbatively
+analyzing a multi-band periodic Anderson model with the spin-orbit coupling. We
+apply the effective spin model to an itinerant magnet in a $P6/mmm$ crystal and
+find various multiple-$Q$ states with a spin scalar chirality in the ground
+state. Our results provide a foundation of constructing effective
+phenomenological spin models for any crystal systems hosting the multiple-$Q$
+states, which will stimulate further exploration of exotic multiple-$Q$ states
+in materials with the spin-orbit coupling.",2202.09744v1
+2022-09-13,Theory of transverse magnetization in spin-orbit coupled antiferromagnets,"Some antiferromagnets under a magnetic field develop magnetization
+perpendicular to the field as well as more conventional ones parallel to the
+field. So far, the transverse magnetization (TM) has been attributed to either
+spin canting effect or the presence of cluster magnetic multipolar ordering.
+However, a general theory of TM based on microscopic understanding is still
+missing. Here, we construct a general microscopic theory of TM in
+antiferromagnets with cluster magnetic multipolar ordering by considering
+classical spin Hamiltonians with spin anisotropy that arises from the
+spin-orbit coupling. First, from general symmetry analysis, we show that TM can
+appear only when all crystalline symmetries are broken other than the
+antiunitary mirror, antiunitary two-fold rotation, and inversion symmetries.
+Moreover, by analyzing spin Hamiltonians, we show that TM always appears when
+the degenerate ground state manifold of the spin Hamiltonian is discrete. On
+the other hand, when the degenerate ground state manifold is continuous, TM
+generally does not appear except when the magnetic field direction and the spin
+configuration satisfy specific geometric conditions under single-ion
+anisotropy. Finally, we show that TM can induce anomalous planar Hall Effect, a
+unique transport phenomenon that can be used to probe multipolar
+antiferromagnetic structures. We believe that our theory provides a useful
+guideline for understanding the anomalous magnetic responses of the
+antiferromagnets with complex magnetic structures.",2209.05702v1
+2017-02-07,Large room temperature spin-to-charge conversion signals in a few-layer graphene/Pt lateral heterostructure,"Electrical generation and detection of pure spin currents without the need of
+magnetic materials are key elements for the realization of full electrically
+controlled spintronic devices. In this framework, achieving a large
+spin-to-charge conversion signal is crucial, since considerable outputs are
+needed for plausible applications. Unfortunately, the values obtained so far
+have been rather low. Here we exploit the spin Hall effect by using Pt, a
+non-magnetic metal with strong spin-orbit coupling, to generate and detect pure
+spin currents in a few-layer graphene channel. Furthermore, the outstanding
+properties of graphene, with long distance spin transport and higher electrical
+resistivity than metals, allows us to achieve in our graphene/Pt lateral
+heterostructures the largest spin-to-charge voltage signal at room temperature
+reported so far in the literature. Our approach opens up exciting opportunities
+towards the implementation of spin-orbit-based logic circuits and all
+electrical control of spin information without magnetic field.",1702.01971v2
+2022-10-24,Spin State Evolution of (99942) Apophis during its 2029 Earth Encounter,"We explore the effects of the 2029 Earth encounter on asteroid (99942)
+Apophis' non-principal axis spin state, leveraging refined orbit, spin state,
+and inertia information provided by more recent optical and radar observations.
+Propagating the asteroids' coupled orbit and rigid body attitude dynamics
+through the flyby, we present the range of possible post-flyby spin states.
+These spin state distributions will be valuable for planning Apophis
+observation campaigns and spacecraft missions, most notably OSIRIS-APEX. The
+simulations indicate that gravitationally induced changes to the asteroid's
+tumbling periods and rotational angular momentum direction (pole) will likely
+be significant and measurable. For the current spin state and inertia estimates
+and their uncertainties, Apophis is likely to remain in a short axis mode (SAM)
+tumbling state but its effective spin rate could halve or double. Its pole is
+likely to shift by 10 degrees or more and increase in longitude while moving
+closer to the ecliptic plane. These spin state changes are very sensitive to
+the asteroid's close approach attitude and mass distribution. With ground-based
+tracking of the asteroid's spin state through the encounter, this sensitivity
+will help refine mass distribution knowledge. We also discuss the implications
+of this abrupt spin state alteration for Apophis' Yarkovsky acceleration and
+geophysical properties, identifying possible pathways for surface and internal
+changes, most notably if Apophis is a contact binary. Comparison of the pre and
+post-flyby inertia estimates obtained from the ground-based observations will
+help assess the extent of possible geophysical changes.",2210.13365v1
+2023-05-15,Tidal Spin-up of Black Hole Progenitor Stars,"Gravitational wave observations indicate the existence of merging black holes
+(BHs) with high spin ($a\gtrsim0.3$), whose formation pathways are still an
+open question. A possible way to form those binaries is through the tidal
+spin-up of a Wolf-Rayet (WR) star by its BH companion. In this work, we
+investigate this scenario by directly calculating the tidal excitation of
+oscillation modes in WR star models, determining the tidal spin-up rate, and
+integrating the coupled spin-orbit evolution for WR-BH binaries. We find that,
+for short-period orbits and massive WR stars, the tidal interaction is mostly
+contributed by standing gravity modes, in contrast to Zahn's model of traveling
+waves which is frequently assumed in the literature. The standing modes are
+less efficiently damped than traveling waves, meaning that prior estimates of
+tidal spin-up may be overestimated. We show that tidal synchronization is
+rarely reached in WR-BH binaries, and the resulting BH spins have $a \lesssim
+0.4$ for all but the shortest-period ($P_{\rm orb} \! \lesssim 0.5 \, {\rm d}$)
+binaries. Tidal spin-up in lower-mass systems is more efficient, providing an
+anticorrelation between the mass and spin of the BHs, which could be tested in
+future gravitational wave data. Nonlinear damping processes are poorly
+understood but may allow for more efficient tidal spin-up. We also discuss a
+new class of gravito-thermal modes that appear in our calculations.",2305.08356v2
+2017-08-30,Gate-Control of Anisotropic Spin Transport and Spin Helix Dynamics in a Modulation-Doped GaAs Quantum Well,"Electron spin transport and dynamics are investigated in a single,
+high-mobility, modulation-doped, GaAs quantum well using ultrafast two-color
+Kerr-rotation micro-spectroscopy, supported by qualitative kinetic theory
+simulations of spin diffusion and transport. Evolution of the spins is governed
+by the Dresselhaus bulk and Rashba structural inversion asymmetries, which
+manifest as an effective magnetic field that can be extracted directly from the
+experimental coherent spin precession. A spin precession length L-SOI is
+defined as one complete precession in the effective magnetic field. It is
+observed that application of (a) an out-of-plane electric field changes the
+spin decay time and L-SOI through the Rashba component of the spin-orbit
+coupling, (b) an in-plane magnetic field allows for extraction of the
+Dresselhaus and Rashba parameters, and (c) an in-plane electric field markedly
+modifies both the L-SOI and diffusion coefficient. While simulations reproduce
+the main features of the experiments, the latter results exceed the
+corresponding simulations and extend previous studies of
+drift-current-dependent spin-orbit interactions.",1708.09150v2
+2019-04-01,Electron-phonon superconductivity in CaBi2 and the role of spin-orbit interaction,"CaBi$_2$ is a recently discovered type-I superconductor with $T_c=2$~K and a
+layered crystal structure. In this work electronic structure, lattice dynamics
+and electron-phonon interaction are studied, with a special attention paid to
+the influence of the spin-orbit coupling (SOC) on above-mentioned quantities.
+We find, that in the scalar-relativistic case (without SOC), electronic
+structure and electron-phonon interaction show the quasi-two dimensional
+character. Strong Fermi surface nesting is present, which leads to appearance
+of the Kohn anomaly in the phonon spectrum and enhanced electron-phonon
+coupling for the phonons propagating in the Ca-Bi atomic layers. However,
+strong spin-orbit coupling in this material changes the topology of the Fermi
+surface, reduces the nesting and the electron-phonon coupling becomes weaker
+and more isotropic. The electron-phonon coupling parameter $\lambda$ is reduced
+by SOC almost twice, from 0.94 to 0.54, giving even stronger effect on the
+superconducting critical temperature $T_c$, which drops from 5.2~K (without
+SOC) to 1.3~K (with SOC). Relativistic values of $\lambda$ and $T_c$ remain in
+a good agreement with experimental findings, confirming the general need for
+including SOC in analysis of the electron-phonon interaction in materials
+containing heavy elements.",1904.00650v1
+2022-03-10,Electrically tunable Berry curvature and strong light-matter coupling in birefringent perovskite microcavities at room temperature,"The field of spinoptronics is underpinned by good control over photonic
+spin-orbit coupling in devices that possess strong optical nonlinearities. Such
+devices might hold the key to a new era of optoelectronics where momentum and
+polarization degrees-of-freedom of light are interwoven and interfaced with
+electronics. However, manipulating photons through electrical means is a
+daunting task given their charge neutrality and requires complex electro-optic
+modulation of their medium. In this work, we present electrically tunable
+microcavity exciton-polariton resonances in a Rashba-Dresselhaus spin-orbit
+coupling field at room temperature. We show that a combination of different
+spin orbit coupling fields and the reduced cavity symmetry leads to tunable
+formation of Berry curvature, the hallmark of quantum geometrical effects. For
+this, we have implemented a novel architecture of a hybrid photonic structure
+with a two-dimensional perovskite layer incorporated into a microcavity filled
+with nematic liquid crystal. Our work interfaces spinoptronic devices with
+electronics by combining electrical control over both the strong light-matter
+coupling conditions and artificial gauge fields.",2203.05289v1
+2009-03-05,Quantum critical behavior driven by Hund's rule coupling in quantum antiferromagnets,"When localized spins on different d orbitals prefer different types of
+antiferromagnetic ordering, the Hund's rule coupling creates frustration. Using
+spin-wave theory we study the case of two such orbitals on a square lattice
+coupled through Hund's rule, such that the first one couples
+antiferromagnetically (AF) more strongly to its nearest neighbors, while the
+second couples more strongly to its next nearest neighbors. We find that the
+zero temperature phase diagram has four regions, one characterized by the
+familiar $(\pi,\pi)$ AF order, a second by the columnar $(\pi,0)$ order, a
+third by a {\it canted} order and a fourth region where a quantum-disordered
+state emerges. We comment on the possible relevance of these findings for the
+case of Fe-pnictide based antiferromagnets.",0903.0983v1
+2020-02-11,FORTRESS: FORTRAN programs for solving coupled Gross-Pitaevskii equations for spin-orbit coupled spin-1 Bose-Einstein condensate,"Here, we present simple and efficient numerical scheme to study static and
+dynamic properties of spin-1 Bose-Einstein condensates (BECs) with spin-orbit
+(SO) coupling by solving three coupled Gross-Pitaevskii equations (CGPEs) in
+three-, quasi-two and quasi-one dimensional systems. We provide a set of three
+codes developed in FORTRAN 90/95 programming language with user defined '{\em
+option}' of imaginary and real-time propagation. We present the numerical
+results for energy, chemical potentials, and component densities for the ground
+state and compare with the available results from the literature. The results
+are presented for both the ferromagnetic and antiferromagnetic spin-1 BECs with
+and without SO coupling. To improve the computational speed, all the codes have
+the option of OpenMP parallelization. We have also presented the results for
+speedup and efficiency of OpenMP parallelization for the three codes with both
+imaginary and real-time propagation.",2002.04365v2
+2019-01-09,Effect of spin-orbit coupling on tunnelling escape of Bose-Einstein condensate,"We theoretically investigate quantum tunnelling escape of a spin-orbit (SO)
+coupled Bose-Einstein condensate (BEC) from a trapping well. The condensate is
+initially prepared in a quasi-one-dimensional harmonic trap. Depending on the
+system parameters, the ground state can fall in different phases --- single
+minimum, separated or stripe. Then, suddenly the trapping well is opened at one
+side. The subsequent dynamics of the condensate is studied by solving nonlinear
+Schr\""{o}dinger equations. We found that the diverse phases will greatly change
+the tunneling escape behavior of SO coupled BECs. In single minimum and
+separated phases, the condensate escapes the trapping well continuously, while
+in stripe phase it escapes the well as an array of pulses. We also found that
+SO coupling has a suppressing effect on the tunnelling escape of atoms.
+Especially, for BECs without inter-atom interaction, the tunnelling escape can
+be almost completely eliminated when the system is tuned near the transition
+point between single minimum and stripe phase. Our work thus suggests that SO
+coupling may be a useful tool to control the tunnelling dynamic of BECs, and
+potentially be applied in realization of atom lasers and matter wave switches.",1901.02621v1
+2022-03-22,Superradiant Quantum Phase transition for Landau Polaritons with Rashba and Zeeman couplings,"We develop a theory of cavity quantum electrodynamics for a two-dimensional
+electron gas in the presence of Rashba spin-orbit and Zeeman couplings and
+perpendicular magnetic field, coupled to a spatially nonuniform quantum photon
+field. We show that the superradiant quantum phase transition (SQPT), also
+known as photon condensation, can in principle occur through a pure in-plane
+Zeeman coupling, but it requires extremely small (unrealistic) quantum well
+widths or extremely fine tuning of the effective Land\'e factor which makes two
+Landau levels coincide. Landau level crossings can also be induced by the
+Rashba spin-orbit coupling and they promote the SQPT which can be obtained for
+certain values of the effective Land\'e factor and filling factors.",2203.11850v2
+2011-07-25,Spin-Orbit Coupled Bose-Einstein Condensate under Rotation,"We examine the combined effects of Rashba spin-orbit (SO) coupling and
+rotation on trapped spinor Bose-Einstein condensates (BECs). Nature of single
+particle states is thoroughly examined in the Landau level basis and is shown
+to support the formation of half-quantum vortex. In the presence of weak s-wave
+interactions, the ground state at strong SO coupling develops ring-like
+structures with domains whose number shows step behavior with increasing
+rotation. For fast rotation case, the vortex pattern favors triangular lattice,
+accompanied by the density depletion in the central region and weakened
+Skyrmionic character as the SO coupling is enhanced. Giant vortex formation is
+facilitated when SO coupling and rotation are both strong.",1107.4845v2
+2013-06-14,Localized modes in dense repulsive and attractive Bose-Einstein condensates with spin-orbit and Rabi couplings,"We consider a binary Bose-Einstein condensate with linear and nonlinear
+interactions between its components, which emulate the spinor system with
+spin-orbit (SO) and Rabi couplings. For a relatively dense condensate, 1D
+coupled equations with the nonpolynomial nonlinearity of both repulsive and
+attractive signs are derived from the 3D Gross-Pitaevskii equations. Profiles
+of modes confined in an external potential under the action of the
+self-repulsion, and self-trapped solitons in the case of the self-attraction,
+are found in a numerical form and by means of analytical approximations. In the
+former case, the interplay of the SO and Rabi couplings with the repulsive
+nonlinearity strongly distorts shapes of the trapped modes, adding conspicuous
+side lobes to them. In the case of the attractive nonlinearity, the most
+essential result is reduction of the collapse threshold under the action of the
+SO and Rabi couplings.",1306.3402v1
+2017-10-02,High Controllable and Robust 2D Spin-Orbit Coupling for Quantum Gases,"We report the realization of a robust and highly controllable two-dimensional
+(2D) spin-orbit (SO) coupling with topological non-trivial band structure. By
+applying a retro-reflected 2D optical lattice, phase tunable Raman couplings
+are formed into the anti-symmetric Raman lattice structure, and generate the 2D
+SO coupling with precise inversion and $C_4$ symmetries, leading to
+considerably enlarged topological regions. The life time of the 2D SO coupled
+Bose-Einstein condensate reaches several seconds, which enables the exploring
+of fine tuning interaction effects. These essential advantages of the present
+new realization open the door to explore exotic quantum many-body effects and
+non-equilibrium dynamics with novel topology.",1710.00717v3
+2018-01-16,Matter-waves in Bose-Einstein condensates with spin-orbit and Rabi couplings,"We investigate the one-dimensional (1D) and two-dimensional (2D)reduction of
+a quantum field theory starting from the three-dimensional (3D) many-body
+Hamiltonian of interacting bosons with spin-orbit (SO) and Rabi couplings. We
+obtain the effective time-dependent 1D and 2D nonpolynomial Heisenberg
+equations for both repulsive and attractive signs of the inter-atomic
+interaction. Our findings show that in case in which the many-body state
+coincides with the Glauber coherent state,the 1D and 2D Heisenberg equations
+become 1D and 2D nonpolynomial Schr\""odinger equations (NPSEs). These models
+were derived in a mean-field approximation from 3D Gross-Pitaevskii equation
+(GPE), describing a Bose-Einstein condensate (BEC)with SO and Rabi couplings.
+In the present work self-repulsive and self-attractive localized solutions of
+the 1D NPSE and the 1D GPE are obtained in a numerical form. The combined
+action of SO and Rabi couplings produces conspicuous sidelobes on the density
+profile, for both signs of the interaction. In the case of the attractive
+nonlinearity, an essential result is the possibility of getting an unstable
+condensate by increasing of SO coupling.",1801.05314v1
+2021-12-27,Screening nearest-neighbor interactions in networks of exciton-polariton condensates through spin orbit coupling,"We study the modification of the spatial coupling parameter between
+interacting ballistic exciton-polariton condensates in the presence of photonic
+spin orbit coupling appearing from TE-TM splitting in planar semiconductor
+microcavities. We propose a strategy to make the coupling strength between
+next-nearest-neighbours stronger than between nearest-neighbour, which inverts
+the conventional idea of the spatial coupling hierarchy between sites. Our
+strategy relies on the dominantly populated high-momentum components in the
+ballistic condensates which, in the presence of TE-TM splitting, lead to rapid
+radial precession of the polariton pseudospin. As a consequence, condensate
+pairs experience distance-periodic screening of their interaction strength,
+severely modifying their synchronization and condensation threshold solutions.",2112.13601v2
+2023-07-21,Electronic and Spin-Orbit Properties of hBN Encapsulated Bilayer Graphene,"Van der Waals (vdW) heterostructures consisting of Bernal bilayer graphene
+(BLG) and hexagonal boron nitride (hBN) are investigated. By performing
+first-principles calculations we capture the essential BLG band structure
+features for several stacking and encapsulation scenarios. A low-energy model
+Hamiltonian, comprising orbital and spin-orbit coupling (SOC) terms, is
+employed to reproduce the hBN-modified BLG dispersion, spin splittings, and
+spin expectation values. Most important, the hBN layers open an orbital gap in
+the BLG spectrum, which can range from zero to tens of meV, depending on the
+precise stacking arrangement of the individual atoms. Therefore, large local
+band gap variations may arise in experimentally relevant moir\'{e} structures.
+Moreover, the SOC parameters are small (few to tens of $\mu$eV), just as in
+bare BLG, but are markedly proximity modified by the hBN layers. Especially
+when BLG is encapsulated by monolayers of hBN, such that inversion symmetry is
+restored, the orbital gap and spin splittings of the bands vanish. In addition,
+we show that a transverse electric field mainly modifies the potential
+difference between the graphene layers, which perfectly correlates with the
+orbital gap for fields up to about 1~V/nm. Moreover, the layer-resolved Rashba
+couplings are tunable by $\sim 5~\mu$eV per V/nm. Finally, by investigating
+twisted BLG/hBN structures, with twist angles between 6$^{\circ}$ --
+20$^{\circ}$, we find that the global band gap increases linearly with the
+twist angle. The extrapolated $0^{\circ}$ band gap is about 23~meV and results
+roughly from the average of the stacking-dependent local band gaps. Our
+investigations give new insights into proximity spin physics of hBN/BLG
+heterostructures, which should be useful for interpreting experiments on
+extended as well as confined (quantum dot) systems.",2307.11697v2
+1995-06-16,Critical level spacing distribution of two-dimensional disordered systems with spin-orbit coupling,"The energy level statistics of 2D electrons with spin-orbit scattering are
+considered near the disorder induced metal-insulator transition. Using the Ando
+model, the nearest-level-spacing distribution is calculated numerically at the
+critical point. It is shown that the critical spacing distribution is size
+independent and has a Poisson-like decay at large spacings as distinct from the
+Gaussian asymptotic form obtained by the random-matrix theory.",9506072v1
+2001-01-22,"Possibility of two-channel orbital Kondo ""spin"" 1/2 conductance in a quantum dot","We propose that two-channel orbital Kondo ``spin'' 1/2 conductance can be
+measured in a quantum dot at Coulomb Blockade with an odd number of electrons
+with contacts in a pillar configuration, if an orthogonal magnetic field
+induces an appropriate level crossing. At the zero-temperature strong coupling
+fixed point the conductance reaches the unitarity limit with a non-Fermi liquid
+sqrt(T)-law.",0101341v2
+2002-12-10,Quantum Phase Transition in the SU(4) Spin-Orbital Model on the Triangular Lattice,"Motivated by the absence of cooperative Jahn-Teller effect in LiNiO2 and
+BaVS3, two layered oxides with triangular planes, we study the SU(4) symmetric
+spin-orbital model on the triangular lattice. Upon reducing the next-nearest
+neighbour coupling, we show that the system undergoes a quantum phase
+transition to a liquid phase. A variational approach to this liquid phase shows
+that simple types of long-range correlations are suppressed, suggesting that it
+is stable against lattice distortions.",0212211v1
+2004-09-14,Antilocalization and spin-orbit coupling in hole strained GaAs/InGaAs/GaAs quantum well heterostructures,"Low-field magnetoresistance in p-type strained quantum wells is studied. It
+is shown that the Rashba mechanism leads to the cubic in quasimomentum
+spin-orbit splitting of the hole energy spectrum and the antilocalization
+behavior of low-field magnetoresistance is well described by the
+Hikami-Larkin-Nagaoka expression.",0409342v1
+2004-11-02,Anisotropic electron g-factor in quantum dots with spin-orbit interaction,"g-factor tuning of electrons in quantum dots is studied as function of
+in-plane and perpendicular magnetic fields for different confinements. Rashba
+and Dresselhaus effects are considered, and comparison is made between wide-
+and narrow-gap materials. The interplay between magnetic fields and intrinsic
+spin-orbit coupling is analyzed, with two distinct phases found in the spectrum
+for GaAs in perpendicular field. The anisotropy of the g-factor is reported,
+and good agreement with available experimental findings is obtained.",0411071v1
+2005-10-03,Low energy electronic states and triplet pairing in layered cobaltates,"The structure of the low-energy electronic states in layered cobaltates is
+considered starting from the Mott insulating limit. We argue that the coherent
+part of the wave-functions and the Fermi-surface topology at low doping are
+strongly influenced by spin-orbit coupling of the correlated electrons on the
+$t_{2g}$ level. An effective t-J model based on mixed spin-orbital states is
+radically different from that for the cuprates, and supports unconventional,
+pseudospin-triplet pairing.",0510051v1
+2005-12-07,Zitterbewegung of electrons and holes in III-V semiconductor quantum wells,"The notion of zitterbewegung is a long-standing prediction of relativistic
+quantum mechanics. Here we extend earlier theoretical studies on this
+phenomenon for the case of III-V zinc-blende semiconductors which exhibit
+particularly strong spin-orbit coupling. This property makes nanostructures
+made of these materials very favorable systems for possible experimental
+observations of zitterbewegung. Our investigations include electrons in n-doped
+quantum wells under the influence of both Rashba and Dresselhaus spin-orbit
+interaction, and also the two-dimensional hole gas. Moreover, we give a
+detailed anaysis of electron zitterbewegung in quantum wires which appear to be
+particularly suited for experimentally observing this effect.",0512148v1
+2005-12-07,Effect of spin-orbit interaction on a magnetic impurity in the vicinity of a surface,"We propose a new mechanism for surface-induced magnetic anisotropy to explain
+the thickness-dependence of the Kondo resistivity of thin films of dilute
+magnetic alloys. The surface anisotropy energy, generated by spin-orbit
+coupling on the magnetic impurity itself, is an oscillating function of the
+distance d from the surface and decays as 1/d^2. Numerical estimates based on
+simple models suggest that this mechanism, unlike its alternatives, gives rise
+to an effect of the desired order of magnitude.",0512154v1
+2006-08-16,Degenerate states of narrow semiconductor rings in the presence of spin orbit coupling: Role of time-reversal and large gauge transformations,"The electron Hamiltonian of narrow semiconductor rings with the Rashba and
+Dresselhaus spin orbit terms is invariant under time-reversal operation
+followed by a large gauge transformation. We find that all the eigenstates are
+doubly degenerate when integer or half-integer quantum fluxes thread the
+quantum ring. The wavefunctions of a degenerate pair are related to each other
+by the symmetry operation. These results are valid even in the presence of a
+disorder potential. When the Zeeman term is present only some of these
+degenerate levels anticross.",0608347v1
+2007-01-15,Exchange energy and generalized polarization in the presence of spin-orbit coupling in two dimensions,"We discuss a general form of the exchange energy for a homogeneous system of
+interacting electrons in two spatial dimensions which is particularly suited in
+the presence of a generic spin-orbit interaction. The theory is best formulated
+in terms of a generalized fractional electronic polarization. Remarkably we
+find that a net generalized polarization does not necessarily translate into an
+increase in the magnitude of the exchange energy, a fact that in turn favors
+unpolarized states. Our results account qualitatively for the findings of
+recent experimental investigations.",0701355v2
+2007-02-05,"Theory of Layered Iron Oxide on Frustrated Geometry: Electric Polarization, Magnetoelectric Effect and Orbital State","A layered iron oxide \rfeo ($R$: rare-earth elements) is an exotic dielectric
+material with charge-order (CO) driven electric polarization and
+magnetoelectric effect caused by spin-charge coupling. In this paper, a theory
+of electronic structure and dielectric property in \rfeo is presented. Charge
+frustration in paired-triangular lattices allows a charge imbalance without
+inversion symmetry. Spin frustration induces reinforcement of this polar CO by
+a magnetic ordering. We also analyze an orbital model for the Fe ion which does
+not show a conventional long-range order.",0702087v2
+2000-08-17,Effects of Instantons on the YN Interaction,"We investigate the symmetric and anti-symmetric spin-orbit forces (SLS and
+ALS) of the effective $\Lambda$N interaction derived from a quark cluster model
+with the instanton-induced interaction (\III), which can reproduce the observed
+YN cross sections as well as the observed NN scattering data.
+  It is found that coupling to the $\Sigma$N channel enhances $\Lambda$N ALS,
+and therefore that the cancellation between SLS and ALS in the $\Lambda$N
+channel becomes more complete. This may be one of the major reasons why the
+single-particle spin-orbit force of $\Lambda$ in nuclei is weak.",0008178v1
+1998-04-28,Accelerated Electrons and the Unruh Effect,"Quantum effects for electrons in a storage ring are studied in a co-moving,
+accelerated frame. The polarization effect due to spin flip synchrotron
+radiation is examined by treating the electron as a simple quantum mechanical
+two-level system coupled to the orbital motion and to the radiation field. The
+excitations of the spin system are related to the Unruh effect, i.e. the effect
+that an accelerated radiation detector is thermally excited by vacuum
+fluctuations. The importance of orbital fluctuations is pointed out and the
+vertical fluctuations are examined.",9804179v1
+1999-03-18,Hamiltonian Methods for the Study of Polarized Proton Beam Dynamics in Accelerators and Storage Rings,"The equations of classical spin-orbit motion can be extended to a Hamiltonian
+system in 9-dimensional phase space by introducing a coupled spin-orbit Poisson
+bracket and a Hamiltonian function. After this extension and by establishing
+connections between initial and extended systems it becomes possible to apply
+the methods of the theory of Hamiltonian systems to the study of polarized
+particle beam dynamics in circular accelerators and storage rings. Some of
+those methods have been implemented in the computer code FORGET-ME-NOT.",9903032v1
+2004-10-26,An estimate of the inter-system crossing time in light-emitting polymers,"The reported enhanced singlet-exciton yields in light-emitting polymers over
+the statistical limit of 25% has attracted wide experimental and theoretical
+attention. Most theoretical estimates of the singlet-exciton yield depend
+crucially on estimates of the inter-system crossing rates induced by spin-orbit
+coupling. In this paper we use the experimentally determined phosphorescent
+life-time and energy of the lowest-lying triplet state, as well as calculated
+values of Huang-Rhys factors to estimate the spin-orbit matrix element and
+inter-system crossing time between the lowest-lying singlet and triplet states.",0410253v1
+2004-04-01,Representing multiqubit unitary evolutions: spin coherences and infinitesimal coherences,"For the tensor of coherences parametrization of a multiqubit density
+operator, we provide an explicit formulation of the corresponding unitary
+dynamics at infinitesimal level. The main advantage of this formalism (clearly
+reminiscent of the idea of ``coherences'' and ``coupling Hamiltonians'' of spin
+systems) is that the pattern of correlation between qubits and the pattern of
+infinitesimal correlation are highlighted simultaneously and can be used
+constructively for qubit manipulation. For example, it allows to compute
+explicitly a Rodrigues' formula for the one-parameter orbits of nonlocal
+Hamiltonians. The result is easily generalizable to orbits of Cartan
+subalgebras and allows to write the Cartan decomposition of unitary propagators
+as a linear action.",0404006v2
+2005-05-09,Adiabatic geometric phases in hydrogenlike atoms,"We examine the effect of spin-orbit coupling on geometric phases in
+hydrogenlike atoms exposed to a slowly varying magnetic field. The marginal
+geometric phases associated with the orbital angular momentum and the intrinsic
+spin fulfill a sum rule that explicitly relates them to the corresponding
+geometric phase of the whole system. The marginal geometric phases in the
+Zeeman and Paschen-Back limit are analyzed. We point out the existence of nodal
+points in the marginal phases that may be detected by topological means.",0505058v2
+2009-09-04,Approximate Analytical Solutions of the Pseudospin Symmetric Dirac Equation for Exponential-type Potentials,"The solvability of The Dirac equation is studied for the exponential-type
+potentials with the pseudospin symmetry by using the parametric generalization
+of the Nikiforov-Uvarov method. The energy eigenvalue equation, and the
+corresponding Dirac spinors for Morse, Hulthen, and q-deformed Rosen-Morse
+potentials are obtained within the framework of an approximation to the
+spin-orbit coupling term, so the solutions are given for any value of the
+spin-orbit quantum number $\kappa=0$, or $\kappa \neq 0$.",0909.0821v1
+2010-08-26,Evidence for charge orbital and spin stripe order in an overdoped manganite,"We present diffraction data on a single-layered manganite
+La(0.42)Sr(1.58)MnO4 with hole doping (x>0.5). Overdoped La(0.42)Sr(1.58)MnO4
+exhibits a complex ordering of charges, orbitals and spins. Single crystal
+neutron diffraction experiments reveal three incommensurate and one
+commensurate order parameters to be tightly coupled. The position and the shape
+of the distinct superstructure scattering points to a stripe arrangement in
+which ferromagnetic zigzag chains are disrupted by additional Mn4+ stripes.",1008.4496v1
+2011-06-23,Probing high-energy electronic excitations using inelastic neutron scattering,"High-energy, local multiplet excitations of the d-electrons are revealed in
+our inelastic neutron scattering measurements on the prototype magnetic
+insulator NiO. These become allowed by the presence of both non-zero crystal
+field and spin-orbit coupling. The observed excitations are consistent with
+optical, x-ray, and EELS measurements of d-d excitations. This experiment
+serves as a proof of principle that high-energy neutron spectroscopy is a
+reliable and useful technique for probing electronic excitations in systems
+with significant crystal field and spin-orbit interactions.",1106.4634v1
+2011-08-02,Spin-orbit-enhanced Wigner localization in quantum dots,"We investigate quantum dots with Rashba spin-orbit coupling in the
+strongly-correlated regime. We show that the presence of the Rashba interaction
+enhances the Wigner localization in these systems, making it achievable for
+higher densities than those at which it is observed in Rashba-free quantum
+dots. Recurring shapes in the pair-correlated densities of the yrast spectrum,
+which might be associated with rotational and vibrational modes, are also
+reported.",1108.0512v3
+2011-09-19,Local Quantum Criticality of an Iron-Pnictide Tetrahedron,"Motivated by the close correlation between transition temperature ($T_c$) and
+the tetrahedral bond angle of the As-Fe-As layer observed in the iron-based
+superconductors, we study the interplay between spin and orbital physics of an
+isolated iron-arsenide tetrahedron embedded in a metallic environment. Whereas
+the spin Kondo effect is suppressed to low temperatures by Hund's coupling, the
+orbital degrees of freedom are expected to quantum mechanically quench at high
+temperatures, giving rise to an overscreened, non-Fermi liquid ground-state.
+Translated into a dense environment, this critical state may play an important
+role in the superconductivity of these materials.",1109.4131v2
+2013-01-26,Electronic Structure and magnetism in Ir based double-perovskite Sr$_2$CeIrO$_6$,"The electronic structure and magnetism of Sr$_2$CeIrO$_6$, an Ir-based double
+perovskite system has been investigated using first-principles calculations. We
+found that a strong spin-orbit coupling dictate the electronic and magnetic
+properties of this system. A small value of $U$ along with SOC could open up a
+gap at the Fermi level, offering the possibility of novel J$_{eff}$ = 1/2 Mott
+quantum state. Our calculations reveal that the magnetic ground state is
+antiferromagnetic in agreement with the magnetization data and provide the
+value of spin and orbital moment for this system which is in agreement with the
+other isostructural Ir-based compound.",1301.6218v1
+2013-06-14,Inter-valley scattering induced by Coulomb interaction and disorder in carbon-nanotube quantum dots,"We develop a theory of inter-valley Coulomb scattering in semiconducting
+carbon-nanotube quantum dots, taking into account the effects of curvature and
+chirality. Starting from the effective-mass description of single-particle
+states, we study the two-electron system by fully including Coulomb
+interaction, spin-orbit coupling, and short-range disorder. We find that the
+energy level splittings associated with inter-valley scattering are nearly
+independent of the chiral angle and, while smaller than those due to spin-orbit
+interaction, large enough to be measurable.",1306.3502v2
+2013-12-31,Tuning Magnetic Properties Polycrystalline of PtCo Alloys Films with Pt,"We experimentally investigated disordered PtxCo1-x (here x: 0.4, 0.5 and 0.6)
+alloy thin films magnetic properties which depended on Pt content. The magnetic
+properties of PtCo films were described with two effects, one of them is the
+hybridization between Co 3d and Pt 5d energy levels and it causes Pt magnetic
+polarization. The second one is the high spin orbit coupling constant of Pt
+which increases the ratio of magnetic orbital moment to spin moment. We
+investigated magnetic properties considering these effects by vibrating sample
+magnetometer (VSM) and ferromagnetic resonance (FMR) techniques.",1401.0227v2
+2014-09-25,Equivalent spin-orbit interaction in two-polariton Jaynes-Cummings-Hubbard model,"A hybrid quantum system combines two or more distinct quantum components,
+exhibiting features not seen in these individual systems. In this work, we
+study the one-dimensional Jaynes-Cummings- Hubbard model in the two-excitation
+subspace. We find that the center momentum of two-excitation induces a magnetic
+ux piercing the 4-leg ladder in the auxiliary space. Furthermore, it is shown
+that the system in {\pi}-center-momentum subspace is equivalent to a chain
+system for spin-1 particle with spin-orbit coupling. As a simple application,
+based on this concise description, a series of bound-pair eigenstates is
+presented, which displays long-range correlation.",1409.7161v1
+2015-02-07,Majorana Fermion Rides on a Magnetic Domain Wall,"We propose using a mobile magnetic domain wall as a host of zero-energy
+Majorana fermions in a spin-orbit coupled nanowire sandwiched by two
+ferromagnetic strips and deposited on an $s$-wave superconductor. The ability
+to control domain walls by thermal means allows to braid Majorana fermions
+nonintrusively, which obey non-Abelian statistics. The analytical solutions of
+Majorana fermions inside domain walls are obtained in the strong spin-orbit
+regime.",1502.02088v1
+2015-11-14,Spin-orbit concept of open-shell systems,"The paper presents a first attempt to look at the peculiarities of open-shell
+systems from the viewpoint of spin-orbit coupling. Contrary to common opinion
+of a negligible role of the issue for light element molecules, presented in the
+paper evidences its governing role in such systems peculiarities on example of
+sp2 nanocarbons. A particular attention is given to the justification of the
+validity of UHF approach to exhibit the SOC peculiarities of open-shell
+systems.",1511.05480v1
+2016-01-13,Anisotropic Paramagnetic Meissner Effect by Spin-Orbit Coupling,"Conventional $s$-wave superconductors repel external magnetic flux. However,
+a recent experiment [A. Di Bernardo et al., Phys. Rev. X \textbf{5}, 041021
+(2015)] has tailored the electromagnetic response of superconducting
+correlations via adjacent magnetic materials. We consider another route to
+alter the Meissner effect where spin-orbit interactions induce an anisotropic
+Meissner response that changes sign depending on the field orientation. The
+tunable electromagnetic response opens new paths in the utilization of hybrid
+systems comprised of magnets and superconductors.",1601.03404v2
+2018-04-25,Topological Insulator State due to Finite Spin-Orbit Interaction in an Organic Dirac Fermion System,"Recently, Valenti et al. pointed out the significance of the spin-orbit
+interaction (SOI) in organic materials, and explained the anomalous insulating
+behavior of a Dirac semimetal alpha-(BEDT-TTF)2I3 at low temperatures in terms
+of the small SOI gap. We propose a lattice model with plausible SOI coupling,
+and indicate that the gapped state is a topological insulator. This model is an
+organic analogue of the Kane-Mele model for graphene.",1804.09420v1
+2018-11-13,Composition and Stacking Dependent Topology in Bilayers from the Graphene Family,"We present a compositional and structural investigation of silicene,
+germanene, and stanene bilayers from first-principles. Due to the staggering of
+the individual layers, several stacking patterns are possible, most of which
+are not available to the bilayer graphene. This structural variety, in
+conjunction with the presence of the spin-orbit coupling, unveil a diversity of
+the electronic properties, with the appearance of distinct band features,
+including orbital hybridization and band inversion. We show that for particular
+cases, the intrinsic spin Hall response exhibits signatures of non-trivial
+electronic band topology, making these structures promising candidates to probe
+Dirac-like physics.",1811.05525v2
+2011-11-21,Mapping spin-polarised transitions with atomic resolution,"The coupling between Angstrom-sized electron probes and spin polarised
+electronic transitions shows that the inelastically scattered probe is in a
+mixed state containing electron vortices with non-zero orbital angular
+momentum. These electrons create an asymmetric intensity distribution in energy
+filtered diffraction patterns, giving access to maps of the magnetic moments
+with atomic resolution. A feasibility experiment shows evidence of the
+predicted effect. Potential applications are column-by-column maps of magnetic
+ordering, and the creation of Angstrom-sized free electrons with orbital
+angular momentum by inelastic scattering in a thin ferromagnetic foil.",1111.4915v2
+2012-04-03,Quaternionic vector coherent states for spin-orbit interactions,"This work addresses the study of two-dimensional electron gas in a
+perpendicular magnetic field in the presence of both Rashba and Dresselhaus
+spin-orbit (SO) interactions, with effective Zeeman coupling. Exact analytical
+expressions are found for the eigenvalue problem giving the Landau levels and
+the associated eigenstates, thanks to an appropriate method of parametrization
+used to quantize the physical system. Such a system exhibits interesting
+properties of quaternions for which vector coherent states are built.
+Similarity with the Weyl-Heisenberg group and some relevant properties of these
+vectors are discussed.",1204.0722v1
+2013-09-21,Photovoltaic effect in BiFeO3/TiO2 heterostructures tuned with epitaxial strain and an electric field,"The photovoltaic effect in the BiFeO3/TiO2 heterostructures can be tuned by
+epitaxial strain and an electric field in the visible-light region which is
+manifested by the enhancement of absorption activity in the heterojunction
+under tensile strain and an electric field based on the first-principles
+calculations. It is suggested that there are coupling between photon, spin
+carrier, charge, orbital, and lattice in the interface of the bilayer film
+which makes the heterojunction an intriguing candidate towards fabricating the
+multifunctional photoelectric devices based on spintronics. The microscopic
+mechanism involved in the heterostruces is related deeply with the spin
+transfer and charge rearrangement between the Fe 3d and O 2p orbitals in the
+vicinity of the interface.",1309.5432v1
+2016-05-02,Majorana fermions at odd junctions in a wire network of ferromagnetic impurities,"We consider a wire network of ferromagnetic impurities on the surface of an
+$s$-wave superconductor with strong Rashba spin-orbit interaction. Within the
+topological phase, zero-energy Majorana fermions appear at wire end-points as
+well as at junctions between an odd number of wire segments, while no
+low-energy states are present at junctions between an even number of wire
+segments, providing strong experimentally accessible signatures for Majorana
+fermions. We also investigate the quasiparticle energy gap with respect to
+varying the Rashba spin-orbit coupling and magnetic impurity strength.",1605.00696v1
+2016-08-02,Ferromagnetic Damping/Anti-damping in a Periodic 2D Helical surface; A Non-Equilibrium Keldysh Green Function Approach,"In this paper, we investigate theoretically the spin-orbit torque as well as
+the Gilbert damping for a two band model of a 2D helical surface state with a
+Ferromagnetic (FM) exchange coupling. We decompose the density matrix into the
+Fermi sea and Fermi surface components and obtain their contributions to the
+electronic transport as well as the spin-orbit torque (SOT). Furthermore, we
+obtain the expression for the Gilbert damping due to the surface state of a 3D
+Topological Insulator (TI) and predicted its dependence on the direction of the
+magnetization precession axis.",1608.00984v2
+2019-09-25,Magnetic Quantum Phase Transitions in a Clean Dirac Metal,"We consider clean Dirac metals where the linear band crossing is caused by a
+strong spin-orbit interaction, and study the quantum phase transitions from the
+paramagnetic phase to various magnetic phases, including homogeneous
+ferromagnets, ferrimagnets, canted ferromagnets, and magnetic nematics. We show
+that in all of these cases the coupling of fermionic soft modes to the order
+parameter generically renders the quantum phase transition first order, with
+certain gapless Dirac systems providing a possible exception. These results are
+surprising since a strong spin-orbit scattering suppresses the mechanism that
+causes the first order transition in ordinary metals. The important role of
+chirality in generating a new mechanism for a first-order transition is
+stressed.",1909.11642v1
+2019-08-03,Resonant inelastic x-ray scattering study of $α$-RuCl$_3$: a progress report,"Ru M$_3$-edge resonant inelastic x-ray scattering (RIXS) measurements of
+RuCl$_3$ with 27 meV resolution reveals a spin-orbit exciton without noticeable
+splitting. We extract values for the spin-orbit coupling constant
+($\lambda=154\pm2$ meV) and trigonal distortion field energy
+($\left|\Delta\right|<65$ meV) which support the $j_{\rm eff}=1/2$ nature of
+RuCl$_3$. We demonstrate the feasibility of M-edge RIXS for $4d$ systems, which
+allows ultra high-resolution RIXS of $4d$ systems until instrumentation for
+L-edge RIXS improves.",1908.01190v1
+2019-12-17,"Itinerant surfaces with spin-orbit couplings, correlations and external magnetic fields: Exact results","We analyze, in exact terms, multiband 2D itinerant correlated fermionic
+systems with many-body spin-orbit interactions, and in-plane external magnetic
+fields. Even if such systems with broad applicability in leading technologies
+are non-integrable, we set up an exact solution procedure for them, which is
+described in detail. Casting the Hamiltonian in positive semidefinite form, the
+technique leads to the ground state and also characterizes the low lying
+excitation spectrum.",1912.07888v1
+2016-10-07,Ballistic Anisotropic Magnetoresistance in Core Shell Nanowires and Rolled-up Nanotubes,"In ferromagnetic nanostructures, the ballistic anisotropic magnetoresistance
+(BAMR) is a change in the ballistic conductance with the direction of
+magnetization due to spin-orbit interaction. Very recently, a directional
+dependent ballistic conductance has been predicted to occur in a number of
+newly synthesized nonmagnetic semiconducting nanostructures subject to
+externally applied magnetic fields, without necessitating spin-orbit coupling.
+In this article, we review past works on the prediction of this BAMR effect in
+core-shell nanowires and rolled-up nanotubes. This is complemented by new
+results we establish for the transport properties of tubular nanosystems
+subject to external magnetic fields.",1610.02337v1
+2019-06-19,On the pseudospin description of the electron Bloch bands,"We study the transformation properties of the electron states in crystals
+with spin-orbit coupling, focusing primarily on the limitations of the
+frequently used pseudospin-1/2 description of twofold degenerate Bloch bands.
+Using the language of corepresentations of magnetic point groups, we construct
+the Bloch bases across the Brillouin zone in a way which is consistent with all
+symmetry requirements. This construction is applied to derive the effective
+spin-orbit Hamiltonians in noncentrosymmetric crystals, known as the
+generalized Rashba models, in both single-band and multiband cases.",1906.08106v1
+2023-03-14,Magnetic and Structural Properties of 5d Osmate Double Perovskites Probed by Nuclear Magnetic Resonance,"The combined effect of electronic correlation and strong
+spin-orbit-coupling(SOC) can give rise to a variety of exotic quantum phases.
+Double perovskites provide a simple structure to study the spin-orbit-lattice
+entangled states. In this thesis, focusing on the 5d osmate double perovskite
+system, we conduct a combination of work including theoretical model
+simulation, first-principle calculation, and nuclear magnetic resonance
+experiments to understand the fundamental physical properties of this material
+system.",2303.07573v1
+2023-09-04,Spin-orbit coupling and Jahn-Teller effect in $T_d$ symmetry: an \textit{ab initio} study on the substitutional nickel defect in diamond,"We analyze the spin-orbit and Jahn-Teller interactions in $T_d$ symmetry that
+are relevant for substitutional transition metal defects in semiconductors. We
+apply our theory to the substitutional nickel defect in diamond and compute the
+appropriate fine-leve structure and magneto-optical parameters by means of
+hybrid density functional theory. Our calculations confirm the intepretations
+of previous experimental findings that the 2.56-eV and 2.51-eV optical centres
+are associated with this defect. Our analysis of the electronic structure
+unravels possible mechanisms behind the observed optical transitions and the
+optically detected magnetic resonance signal, too.",2310.08591v1
+2021-05-12,Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries,"The search for novel magnetic quantum phases, phenomena and functional
+materials has been guided by relativistic magnetic-symmetry groups in coupled
+spin and real space from the dawn of the field in 1950s to the modern era of
+topological matter. However, the magnetic groups cannot disentangle
+non-relativistic phases and effects, such as the recently reported
+unconventional spin physics in collinear antiferromagnets from the typically
+weak relativistic spin-orbit coupling phenomena. Here we discover that more
+general spin symmetries in decoupled spin and crystal space categorize
+non-relativistic collinear magnetism in three phases: conventional ferromagnets
+and antiferromagnets, and a third distinct phase combining zero net
+magnetization with an alternating spin-momentum locking in energy bands, which
+we dub ""altermagnetic"". For this third basic magnetic phase, which is omitted
+by the relativistic magnetic groups, we develop a spin-group theory describing
+six characteristic types of the altermagnetic spin-momentum locking. We
+demonstrate an extraordinary spin-splitting mechanism in altermagnetic bands
+originating from a local electric crystal field, which contrasts with the
+conventional magnetic or relativistic splitting by global magnetization or
+inversion asymmetry. Based on first-principles calculations, we identify
+altermagnetic candidates ranging from insulators and metals to a parent crystal
+of cuprate superconductor. Our results underpin emerging research of quantum
+phases and spintronics in high-temperature magnets with light elements,
+vanishing net magnetization, and strong spin-coherence.",2105.05820v2
+2017-10-27,"Effect of Cu$^{2+}$ substitution in Spin-Orbit Coupled Sr$_2$Ir$_{1-x}$Cu$_x$O$_4$: Structure, magnetism and electronic properties","Sr$_2$IrO$_4$ is an extensively studied spin-orbit coupling induced insulator
+with antiferromagnetic ground state. The delicate balance between competing
+energy scales plays crucial role for its low temperature phase, and the route
+of chemical substitution has often been used to tune these different energy
+scales. Here, we report an evolution of structural, magnetic and electronic
+properties in doped Sr$_2$Ir$_{1-x}$Cu$_x$O$_4$ ($x$ $\leq$ 0.2). The
+substitution of Cu$^{2+}$ (3$d^9$) for Ir$^{4+}$ (5$d^5$) acts for electron
+doping, though it tunes the related parameters such as, spin-orbit coupling,
+electron correlation and Ir charge state. Moreover, both Ir$^{4+}$ and
+Cu$^{2+}$ has single unpaired spin though it occupies different $d$-orbitals.
+With Cu substitution, system retains its original structural symmetry but the
+structural parameters show systematic changes. X-ray photoemission spectroscopy
+measurements show Ir$^{4+}$ equivalently converts to Ir$^{5+}$ and a
+significant enhancement in the density of states has been observed at the Fermi
+level due to the contribution from the Cu 3$d$ orbitals, which supports the
+observed decrease in the resistivity with Cu substitution. While the long-range
+magnetic ordering is much weakened and the highest doped sample shows almost
+paramagnetic-like behavior the overall system remains insulator. Analysis of
+resistivity data shows mode of charge conduction in whole series follows
+2-dimensional variable-range-hopping model but the range of validity varies
+with temperature. Whole series of samples exhibit negative magnetoresistance at
+low temperature which is considered to be a signature of weak localization
+effect in spin-orbit coupled system, and its evolution with Cu appears to
+follow the variation of resistivity with $x$.",1710.10281v1
+2006-08-23,Spin-orbit interactions and spin-currents from an exact-exchange Kohn-Sham method,"An exact-exchange spin-current Kohn-Sham method to treat non-collinear spin,
+magnetic effects, currents, spin-currents, and spin-orbit interactions
+self-consistently on equal footing is introduced. Spin-orbit interactions are
+shown to induce spin-currents. Results for silicon and germanium are presented.",0608505v1
+2006-05-16,Divergence of the orbital nuclear magnetic relaxation rate in metals,"We analyze the nuclear magnetic relaxation rate $(1/T_1)_{orb}$ due to the
+coupling of nuclear spin to the orbital moment of itinerant electrons in
+metals. In the clean non--interacting case, contributions from large--distance
+current fluctuations add up to cause a divergence of $(1/T_1)_{orb}$. When
+impurity scattering is present, the elastic mean free time $\tau$ cuts off the
+divergence, and the magnitude of the effect at low temperatures is controlled
+by the parameter $\ln(\mu \tau)$, where $\mu$ is the chemical potential. The
+spin--dipolar hyperfine coupling, while has the same spatial variation $1/r^3$
+as the orbital hyperfine coupling, does not produce a divergence in the nuclear
+magnetic relaxation rate.",0605420v4
+2012-06-29,Magnetic and Superconducting Ordering at LaAlO3/SrTiO3 Interfaces,"We formulate a model for magnetic and superconducting ordering at
+LaAlO3/SrTiO3 interfaces containing both localized magnetic moments and
+itinerant electrons. Though these both originate in Ti 3d orbitals, the former
+may be due to electrons more tightly-bound to the interface while the latter
+are extended over several layers. Only the latter contribute significantly to
+metallic conduction and superconductivity. In our model, the interplay between
+the two types of electrons, which is argued to be ferromagnetic, combined with
+strong spin-orbit coupling of the itinerant electrons, leads to magnetic
+ordering. Furthermore, we propose a model for interfacial superconductivity,
+consisting of random superconducting grains in the bulk STO driven, via
+coupling to the interface conduction band, towards long-ranged or
+quasi-long-ranged order. Most interestingly, the magnetic order and strong spin
+orbit coupling can lead in this manner to unconventional interfacial
+superconductivity, yielding a possible realization of Majorana physics.",1206.6959v1
+2013-09-16,GW quasiparticle calculations with spin-orbit coupling for the light actinides,"We report on the importance of GW self-energy corrections for the electronic
+structure of light actinides in the weak-to-intermediate coupling regime. Our
+study is based on calculations of the band structure and total density of
+states of Np, U, and Pu using a one-shot GW approximation that includes
+spin-orbit coupling within a full potential LAPW framework. We also present RPA
+screened effective Coulomb interactions for the f-electron orbitals for
+different lattice constants, and show that there is an increased contribution
+from electron-electron correlation in these systems for expanded lattices. We
+find a significant amount of electronic correlation in these highly localized
+electronic systems.",1309.4110v2
+2016-05-09,Orbit-spin coupling and the circulation of the Martian atmosphere,"The physical origins of the observed interannual variability of weather and
+climate on Mars are poorly understood. In this paper we introduce a
+deterministic physical mechanism that may account for much of the variability
+of the circulation of the Mars atmosphere on seasonal and longer timescales. We
+derive a coupling expression linking orbital and rotational motions that
+produces an acceleration field varying with position and with time on and
+within a subject body. The spatially and temporally varying accelerations may
+interfere constructively or destructively with large-scale flows of geophysical
+fluids that are established and maintained by other means. The hypothesis
+predicts cycles of intensification and relaxation of circulatory flows of
+atmospheres on seasonal and longer timescales that are largely independent of
+solar forcing. The predictions of the hypothesis may be tested through
+numerical modeling. Examples from investigations of the atmospheric circulation
+of Mars are provided to illustrate qualitative features and quantitative
+aspects of the mechanism proposed. We briefly discuss the implications and
+applicability of the orbit-spin coupling hypothesis for planets other than
+Mars.",1605.02707v1
+2018-08-21,Pseudo Jahn-Teller Effect and Magnetoelastic Coupling in Spin-Orbit Mott Insulators,"The consequences of the Jahn-Teller (JT) orbital-lattice coupling for
+magnetism of pseudospin J_{eff}=1/2 and J_{eff}=0 compounds are addressed. In
+the former case, represented by Sr_2IrO_4, this coupling generates, through the
+so-called pseudo-JT effect, orthorhombic deformations of a crystal concomitant
+with magnetic ordering. The orthorhombicity axis is tied to the magnetization
+and rotates with it under magnetic field. The theory resolves a number of
+puzzles in Sr_2IrO_4 such as the origin of in-plane magnetic anisotropy and
+magnon gaps, metamagnetic transition, etc. In J_{eff}=0 systems, the pseudo-JT
+effect leads to spin-nematic transition well above magnetic ordering, which may
+explain the origin of `orbital order' in Ca_2RuO_4",1808.06919v2
+2019-08-24,Magnetic order and anisotropic interactions induced by mixing between the $J=1/2$ and $3/2$ sectors in spin-orbit coupled honeycomb-lattice compounds,"Novel magnetic ordering on the honeycomb lattice due to emergent weak
+anisotropic interactions generated by the mixing between the $J=1/2$ sector and
+the magnetically inactive 3/2 sector is investigated in a three-orbital
+interacting electron model in the absence of Hund's coupling. Self-consistent
+determination of magnetic order yields anisotropic N\'{e}el and zigzag orders
+for different parameter regimes, highlighting the effect of the emergent
+single-ion anisotropy. Study of magnon excitations shows extremely small magnon
+energy scale compared to the hopping energy scale, and enhancement of
+anisotropy effects for smaller spin-orbit coupling. These results account for
+several features of the honeycomb lattice compounds such as $\rm Na_2 Ir O_3$
+and $\rm Ru Cl_3$, where the leading order anisotropic interactions within the
+magnetically active $J=1/2$ sector are completely quenched due to the
+edge-sharing octahedra.",1908.09130v1
+2002-10-22,Shot noise for entangled and spin-polarized electrons,"We review our recent contributions on shot noise for entangled electrons and
+spin-polarized currents in novel mesoscopic geometries. We first discuss some
+of our recent proposals for electron entanglers involving a superconductor
+coupled to a double dot in the Coulomb blockade regime, a superconductor
+tunnel-coupled to Luttinger-liquid leads, and a triple-dot setup coupled to
+Fermi leads. We calculate current and shot noise for spin-polarized currents
+and entangled/unentangled electron pairs in a beam-splitter geometry with a
+\textit{local} Rashba spin-orbit (s-o) interaction in the incoming leads. We
+find \textit{continuous} bunching and antibunching behaviors for the
+\textit{entangled} pairs -- triplet and singlet -- as a function of the Rashba
+rotation angle. In addition, we find that unentangled triplets and the
+entangled one exhibit distinct shot noise. Shot noise for spin-polarized
+currents shows sizable oscillations as a function of the Rashba phase. This
+happens only for electrons injected perpendicular to the Rashba rotation axis;
+spin-polarized carriers along the Rashba axis are noiseless. We find an
+additional spin rotation for electrons with energies near the crossing of the
+bands where s-o induced interband coupling is relevant. This gives rise to an
+additional modulation of the noise for both electron pairs and spin-polarized
+currents. Finally, we briefly discuss shot noise for a double dot near the
+Kondo regime.",0210498v1
+2021-07-13,Quantum spins and hybridization in artificially-constructed chains of magnetic adatoms on a superconductor,"Magnetic adatom chains on surfaces constitute fascinating quantum spin
+systems. Superconducting substrates suppress interactions with bulk electronic
+excitations but couple the adatom spins to a chain of subgap Yu-Shiba-Rusinov
+(YSR) quasiparticles. Using a scanning tunneling microscope, we investigate
+such correlated spin-fermion systems by constructing Fe chains adatom by adatom
+on superconducting NbSe$_2$. The adatoms couple entirely via the substrate,
+retaining their quantum spin nature. In dimers, we observe that the deepest YSR
+state undergoes a quantum phase transition due to Ruderman-Kittel-Kasuya-Yosida
+interactions, a distinct signature of quantum spins. Chains exhibit coherent
+hybridization and band formation of the YSR excitations, indicating
+ferromagnetic coupling. Longer chains develop separate domains due to
+coexisting charge-density-wave order of NbSe$_2$. Despite the
+spin-orbit-coupled substrate, we find no signatures of Majoranas, possibly
+because quantum spins reduce the parameter range for topological
+superconductivity. We suggest that adatom chains are versatile systems for
+investigating correlated-electron physics and its interplay with topological
+superconductivity.",2107.06361v2
+2022-06-28,Strong coupling between a photon and a hole spin in silicon,"Spins in semiconductor quantum dots constitute a promising platform for
+scalable quantum information processing. Coupling them strongly to the photonic
+modes of superconducting microwave resonators would enable fast non-demolition
+readout and long-range, on-chip connectivity, well beyond nearest-neighbor
+quantum interactions. Here we demonstrate strong coupling between a microwave
+photon in a superconducting resonator and a hole spin in a silicon-based double
+quantum dot issued from a foundry-compatible MOS fabrication process. By
+leveraging the strong spin-orbit interaction intrinsically present in the
+valence band of silicon, we achieve a spin-photon coupling rate as high as
+330~MHz largely exceeding the combined spin-photon decoherence rate. This
+result, together with the recently demonstrated long coherence of hole spins in
+silicon, opens a new realistic pathway to the development of circuit quantum
+electrodynamics with spins in semiconductor quantum dots.",2206.14082v2
+2022-07-06,Anisotropic exchange coupling and ground state phase diagram of Kitaev compound YbOCl,"Rare-earth chalcohalide REChX (RE = rare earth; Ch = O, S, Se, Te; X = F, Cl,
+Br, I) is a newly reported family of Kitaev spin liquid candidates. The family
+offers a platform where a strong spin-orbit coupling meets a van der Waals
+layered and undistorted honeycomb spin lattice, which outputs highly
+anisotropic exchange couplings required by the Kitaev model. YbOCl is the first
+single crystal of the family we grew, with a size up to ~ 15 mm. We have
+performed magnetization and high magnetic field electron spin resonance
+measurements from 2 to 300 K. We develop the mean-field scenario for the
+anisotropic spin system, with which we are able to well describe the
+experiments and reliably determine the fundamental parameters. The
+self-consistent simulations give the anisotropic spin-exchange interactions of
+$J_{\pm}$ (~ -0.3 K) and $J_{zz}$ (~ 1.6 K), and g factors of $g_{ab}$ (~ 3.4)
+and $g_{c}$ (~ 2.9). Based on the spin-exchange interactions, we employ the
+exact diagonalization method to work out the ground state phase diagram of
+YbOCl in terms of the off-diagonal exchange couplings. The phase diagram
+hosting rich magnetic phases including the spin-disordered one, sheds light on
+the novel magnetic properties of the family, particularly the Kitaev physics.",2207.02383v1
+2024-01-30,Partial tidal disruptions of spinning eccentric white dwarfs by spinning intermediate mass black holes,"Intermediate mass black holes (IMBHs, $\sim 10^2-10^5M_{\odot}$) are often
+dubbed as the missing link between stellar mass ($\lesssim 10^2M_{\odot}$) and
+super-massive ($\gtrsim 10^{5-6} M_{\odot}$) black holes. Observational
+signatures of these can result from tidal disruption of white dwarfs (WDs),
+which would otherwise be captured as a whole by super-massive black holes.
+Recent observations indicate that IMBHs might be rapidly spinning, while it is
+also known that isolated white dwarfs might have large spins, with spin periods
+of the order of minutes. Here, we aim to understand the effects of ``coupling''
+between black hole and stellar spin, focussing on the tidal disruption of
+spinning WDs in the background of spinning IMBHs. Using smoothed particle
+hydrodynamics, we perform a suite of numerical simulations of partial tidal
+disruptions, where spinning WDs are in eccentric orbits about spinning IMBHs.
+We take a hybrid approach, where we integrate the Kerr geodesic equations while
+being in a regime where we can treat the internal stellar fluid dynamics in the
+Newtonian limit. We find substantial effects of the ``coupling'' between the
+black hole spin and the spin of the white dwarf, although the pericenter
+distance of the white dwarf is taken to be large enough so that the Newtonian
+limit of its fluid dynamics is a robust approximation. In particular, the core
+mass, the bound tail mass, and the mass difference between the two tidal tails
+strongly depend on such ``coupled'' spin effects. However, the late time
+fallback rate of the debris behaves similar to the non-spinning cases. We also
+compute gravitational wave amplitudes and find that while the black hole spin
+influences the same, there is no evidence of influence of stellar spin on such
+amplitudes in our regime of interest.",2401.17031v1
+1998-08-12,"Effects of Electron Correlation, Orbital Degeneracy and Jahn-Teller Coupling in Perovskite Manganites","Roles of Coulomb interaction, orbital degeneracy and Jahn-Teller coupling in
+double-exchange models are examined for Mn perovskite oxides. We study the
+undoped Mott insulator as well as metal-insulator transitions by hole doping,
+and especially strong incoherence of ferromagnetic metal. We derive models
+where all the spins are fully polarized in two-dimensional planes as in the
+experimental indications, and investigate their ground-state properties by
+quantum Monte Carlo method. At half filling where the number of $e_{g}$
+electron is one per site on average, the Coulomb interaction opens a Mott gap
+and induces a staggered orbital ordering. The opening of the Mott gap is,
+however, substantially slower than the mean-field results if the Jahn-Teller
+coupling is absent. The synergy between the strong correlation and the
+Jahn-Teller coupling largely enhances the Mott gap amplitude and reproduces
+realistic amplitudes and stabilization energy of the Jahn-Teller distortion.
+Upon doping, the orbital ordering stabilized by the Coulomb interaction is
+destroyed immediately. Toward the metal-insulator transition, the short-ranged
+orbital correlation is critically enhanced in metals, which should be related
+to strong incoherence of charge dynamics observed in experiments. Our model,
+moreover, exhibits a uniform ordering of $d_{x^{2}-y^{2}}$ orbital in a wide
+region of doping in agreement with experimental indications.",9808124v2
+2022-11-14,Orbital Fulde-Ferrell pairing state in moiré Ising superconductors,"In this work, we study superconducting moir\'e homobilayer transition metal
+dichalcogenides where the Ising spin-orbit coupling (SOC) is much larger than
+the moir\'e bandwidth. We call such noncentrosymmetric superconductors, moir\'e
+Ising superconductors. Due to the large Ising SOC, the depairing effect caused
+by the Zeeman field is negligible and the in-plane upper critical field
+($B_{c2}$) is determined by the orbital effects. This allows us to study the
+effect of large orbital fields. Interestingly, when the applied in-plane field
+is larger than the conventional orbital $B_{c2}$, a finite-momentum pairing
+phase would appear which we call the orbital Fulde-Ferrell (FF) state. In this
+state, the Cooper pairs acquire a net momentum of $2q_B$ where $2q_B=eBd$ is
+the momentum shift caused by the magnetic field $B$ and $d$ denotes the layer
+separation. This orbital field-driven FF state is different from the
+conventional FF state driven by Zeeman effects in Rashba superconductors.
+Remarkably, we predict that the FF pairing would result in a giant
+superconducting diode effect under electric gating when layer asymmetry is
+induced. An upturn of the $B_{c2}$ as the temperature is lowered, coupled with
+the giant superconducting diode effect, would allow the detection of the
+orbital FF state.",2211.07406v3
+2022-11-14,Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor,"The conventional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state relies on the
+Zeeman effect of an external magnetic field to break time-reversal symmetry,
+forming a state of finite-momentum Cooper pairing. In superconductors with
+broken inversion symmetries, the Rashba or Ising-type spin-orbit coupling (SOC)
+can interact with either the Zeeman or the orbital effect of magnetic fields,
+extending the range of possible FFLO states, though evidence for these more
+exotic forms of FFLO pairing has been lacking. Here we report the discovery of
+an unconventional FFLO state induced by coupling the Ising SOC and the orbital
+effect in multilayer 2H-NbSe2. Transport measurements show that the
+translational and rotational symmetries are broken in the orbital FFLO state,
+providing the hallmark signatures of finite momentum cooper pairings. We
+establish the entire orbital FFLO phase diagram, consisting of normal metal,
+uniform Ising superconducting phase, and a six-fold orbital FFLO state. This
+study highlights an alternative route to finite-momentum superconductivity and
+provides a universal mechanism to prepare orbital FFLO states in similar
+materials with broken inversion symmetries.",2211.07745v2
+2003-11-05,Weak antilocalization in a strained InGaAs/InP quantum well structure,"Weak antilocalization (WAL) effect due to the interference corrections to the
+conductivity has been studied experimentally in a strained InGaAs/InP quantum
+well structure. From measurements in tilted magnetic filed, it was shown that
+both weak localization and WAL features depend only on the normal component of
+the magnetic field for tilt angles less than 84 degrees. Weak antilocalization
+effect showed non-monotonous dependence on the gate voltage which could not be
+explained by either Rashba or Dresselhouse mechanisms of the spin-orbit
+coupling. To describe magnetic field dependence of the conductivity, it was
+necessary to assume that spin-orbit scattering time depends on the external
+magnetic field which quenches the spin precession around effective, spin-orbit
+related, magnetic fields.",0311116v1
+2004-07-01,Effect of an InP/In$_{0.53}$Ga$_{0.47}$As Interface on Spin-orbit Interaction in In$_{0.52}$Al$_{0.48}$As/In$_{0.53}$Ga$_{0.47}$As Heterostructures,"We report the effect of the insertion of an InP/In$_{0.53}$Ga$_{47}$As
+Interface on Rashba spin-orbit interaction in
+In$_{0.52}$Al$_{0.48}$As/In$_{0.53}$Ga$_{0.47}$As quantum wells. A small spin
+split-off energy in InP produces a very intriguing band lineup in the valence
+bands in this system. With or without this InP layer above the
+In$_{0.53}$Ga$_{47}$As well, the overall values of the spin-orbit coupling
+constant $\alpha$ turned out to be enhanced or diminished for samples with the
+front- or back-doping position, respectively. These experimental results, using
+weak antilocalization analysis, are compared with the results of the
+$\mathbf{k\cdot p}$ theory. The actual conditions of the interfaces and
+materials should account for the quantitative difference in magnitude between
+the measurements and calculations.",0407020v3
+2005-04-19,Nature of magnetism in Ca$_3$Co$_2$O$_6$,"We find using LSDA+U band structure calculations that the novel
+one-dimensional cobaltate Ca$_3$Co$_2$O$_6$ is not a ferromagnetic half-metal
+but a Mott insulator. Both the octahedral and the trigonal Co ions are formally
+trivalent, with the octahedral being in the low-spin and the trigonal in the
+high-spin state. The inclusion of the spin-orbit coupling leads to the
+occupation of the minority-spin $d_{2}$ orbital for the unusually coordinated
+trigonal Co, producing a giant orbital moment (1.57 $\mu_{B}$). It also results
+in an anomalously large magnetocrystalline anisotropy (of order 70 meV),
+elucidating why the magnetism is highly Ising-like. The role of the oxygen
+holes, carrying an induced magnetic moment of 0.13 $\mu_{B}$ per oxygen, for
+the exchange interactions is discussed.",0504490v2
+2004-03-16,Semiclassical propagation of coherent states with spin-orbit interaction,"We study semiclassical approximations to the time evolution of coherent
+states for general spin-orbit coupling problems in two different semiclassical
+scenarios: The limit \hbar to zero is first taken with fixed spin quantum
+number s and then with \hbar*s held constant. In these two cases different
+classical spin-orbit dynamics emerge. We prove that a coherent state propagated
+with a suitable classical dynamics approximates the quantum time evolution up
+to an error of size \sqrt{\hbar} and identify an Ehrenfest time scale.
+Subsequently an improvement of the semiclassical error to an arbitray order
+\hbar^{N/2} is achieved by a suitable deformation of the state that is
+propagated classically.",0403030v1
+2012-07-19,Finger-gate manipulated quantum transport in a semiconductor narrow constriction with spin-orbit interactions and Zeeman effect,"The authors investigate quantum transport in a narrow constriction fabricated
+by narrow band gap semiconductor materials with spin-orbit (SO) couplings. We
+consider the Rashba-Dresselhaus (RD) spin-orbit interactions (SOIs) and the
+Zeeman effect induced by an in-plane magnetic field along the transport
+direction. The interplay of the RD-SOI and the Zeeman effect may induce a
+SOI-Zeeman gap and influence the transport properties. We demonstrate that an
+attractive scattering potential may induce electron-like quasi-bound-state
+feature and manifest the RD-SOI-Zeeman induced Fano line-shape in conductance.
+Furthermore, a repulsive scattering potential may induce hole-like
+quasi-bound-state feature on the subband top of the lower spin branch.",1207.4558v2
+2013-01-02,Spin-orbital locked magnetic excitations in a half-metallic double perovskite Ba2FeReO6,"We present a powder inelastic neutron scattering study of magnetic
+excitations in Ba$_2$FeReO$_6$, a member of the double perovskite family of
+materials which exhibit half-metallic behavior and high Curie temperatures. We
+find clear evidence of two well-defined dispersing magnetic modes in its low
+temperature ferrimagnetic state. We develop a local moment model, which
+incorporates the interaction of Fe spins with spin-orbit locked magnetic
+moments on Re, and show that this captures our experimental observations. Our
+study further opens up double perovskites as model systems to explore the
+interplay of strong correlations and spin-orbit coupling in 5d transition metal
+oxides.",1301.0327v1
+2015-01-22,Anatomy of Dzyaloshinskii-Moriya Interaction at Co/Pt Interfaces,"The Dzyaloshinskii-Moriya Interaction (DMI) between spins is induced by
+spin-orbit coupling in magnetic materials lacking inversion symmetry. DMI is
+recognized to play a crucial role at the interface between ferromagnetic (FM)
+and heavy nonmagnetic (NM) metals to create topological textures called
+magnetic skyrmions which are very attractive for ultra-dense information
+storage and spintronic devices. DMI also plays an essential role for fast
+domain wall (DW) dynamics driven by spin-orbit torques. Here, we present first
+principles calculations which clarify the main features and microscopic
+mechanisms of DMI in Co/Pt bilayers. DMI is found to be predominantly located
+at the interfacial Co layer, originating from spin-orbit energy provided by the
+adjacent NM layer. Furthermore, no direct correlation is found between DMI and
+proximity induced magnetism in Pt. These results clarify underlying mechanisms
+of DMI at FM/NM bilayers and should help optimizing material combinations for
+skyrmion- and DW-based storage and memory devices.",1501.05511v1
+2016-01-16,Spin-orbit torque in Cr/CoFeAl/MgO and Ru/CoFeAl/MgO epitaxial magnetic heterostructures,"We study the spin-orbit torque (SOT) effective fields in Cr/CoFeAl/MgO and
+Ru/CoFeAl/MgO magnetic heterostructures using the adiabatic harmonic Hall
+measurement. High-quality perpendicular-magnetic-anisotropy CoFeAl layers were
+grown on Cr and Ru layers. The magnitudes of the SOT effective fields were
+found to significantly depend on the underlayer material (Cr or Ru) as well as
+their thicknesses. The damping-like longitudinal effective field ({\Delta}H_L)
+increases with increasing underlayer thickness for all heterostructures. In
+contrast, the field-like transverse effective field ({\Delta}H_T) increases
+with increasing Ru thickness while it is almost constant or slightly decreases
+with increasing Cr thickness. The sign of {\Delta}H_L observed in the
+Cr-underlayer devices is opposite from that in the Ru-underlayer devices while
+{\Delta}H_T shows the same sign with a small magnitude. The opposite directions
+of {\Delta}HL indicate that the signs of spin Hall angle in Cr and Ru are
+opposite, which are in good agreement with theoretical predictions. These
+results show sizable contribution from SOT even for elements with small spin
+orbit coupling such as 3d Cr and 4d Ru.",1601.04164v1
+2016-06-03,Non-collinear spin-orbit magnetic fields in a carbon nanotube double quantum dot,"We demonstrate experimentally that non-collinear intrinsic spin-orbit
+magnetic fields can be realized in a curved carbon nanotube two-segment device.
+Each segment, analyzed in the quantum dot regime, shows near four-fold
+degenerate shell structure allowing for identification of the spin-orbit
+coupling and the angle between the two segments. Furthermore, we determine the
+four unique spin directions of the quantum states for specific shells and
+magnetic fields. This class of quantum dot systems is particularly interesting
+when combined with induced superconducting correlations as it may facilitate
+unconventional superconductivity and detection of Cooper pair entanglement. Our
+device comprises the necessary elements.",1606.01065v1
+2018-02-15,Tunneling magnetoresistance enhancement by symmetrization in spin-orbit torque magnetic tunnel junction,"Heavy metals with strong spin-orbit coupling (SOC) have been employed to
+generate spin current to control the magnetization dynamics by spin-orbit
+torque (SOT). Magnetic tunnel junction based on SOT (SOT-MTJ) is a promising
+application with efficient writing operation. Unfortunately, SOT-MTJ faces the
+low tunneling magnetoresistance (TMR) problem. In this work, we present an ab
+initio calculation on the TMR in SOT-MTJ. It is demonstrated that TMR would be
+enhanced by SOT-MTJ symmetry structure. The symmetrization induces interfacial
+resonant states (IRSs). When IRSs match identical resonances at the opposite
+barrier interface, resonant tunneling occurs in SOT-MTJ, which significantly
+contributes to the conductance in parallel configuration and improves TMR. We
+demonstrate the occurrence of resonant tunneling by transmission spectra,
+density of scattering states and differential density of states. We also point
+out that the thickness of heavy metal has limited influence on TMR. This work
+would benefit the TMR optimization in SOT-MTJ, as well as the SOT spintronics
+device.",1802.05787v2
+2018-11-12,Site selective spin and orbital excitations in Fe3O4,"$Fe_3O_4$ is a mixed-valence strongly correlated transition metal oxide which
+displays the intriguing metal to insulator Verwey transition. Here we
+investigate the electronic and magnetic structure of $Fe_3O_4$ by a unique
+combination of high-resolution Fe 2p3d resonant inelastic scattering magnetic
+circular (RIXS-MCD) and magnetic linear (RIXS-MLD) dichroism. We show that by
+coupling the site selectivity of RIXS with the magnetic selectivity imposed by
+the incident polarization handedness, we can unambiguously identify spin-flip
+excitations and quantify the exchange interaction of the different sublattices.
+Furthermore, our RIXS-MLD measurements show spin-orbital excitations that
+exhibit strong polarization and magnetic field dependence. Guided by
+theoretical simulations, we reveal that the angular dependence arises from a
+strong interplay between trigonal crystal-field, magnetic exchange and
+spin-orbit interaction at the nominal $Fe^{2+}$ sites. Our results highlight
+the capabilities of RIXS magnetic dichroism studies to investigate the ground
+state of complex systems where in-equivalent sites and bonds are simultaneously
+present.",1811.04836v1
+2012-05-21,Designer quantum spin Hall phase transition in molecular graphene,"Graphene was the first material predicted to be a time-reversal-invariant
+topological insulator; however, the insulating gap is immeasurably small owing
+to the weakness of spin-orbit interactions in graphene. A recent experiment [1]
+demonstrated that designer honeycomb lattices with graphene-like ""Dirac"" band
+structures can be engineered by depositing a regular array of carbon monoxide
+atoms on a metallic substrate. Here, we argue that by growing such designer
+lattices on metals or semiconductors with strong spin-orbit interactions, one
+can realize an analog of graphene with strong intrinsic spin-orbit coupling,
+and hence a highly controllable two-dimensional topological insulator. We
+estimate the range of substrate parameters for which the topological phase is
+achievable, and consider the experimental feasibility of some candidate
+substrates.",1205.4728v1
+1999-05-05,Weak localisation in AlGaAs/GaAs p-type quantum wells,"We have for the first time experimentally investigated the weak localisation
+magnetoresistance in a AlGaAs/GaAs p-type quantum well. The peculiarity of such
+systems is that spin-orbit interaction is strong. On the theoretical side it is
+not possible to treat the spin-orbit interaction as a perturbation. This is in
+contrast to all prior investigations of weak localisation. In this letter we
+compare the experimental results with a newly developed diffusion theory, which
+explicitly describes the weak localisation regime when the spin-orbit coupling
+is strong. The spin relaxation rates calculated from the fitting parameters was
+found to agree with theoretical expectations. Furthermore the fitting
+parameters indicate an enhanced phase breaking rate compared to theoretical
+predictions.",9905057v2
+1999-03-22,The Dirac Oscillator. A relativistic version of the Jaynes--Cummings model,"The dynamics of wave packets in a relativistic Dirac oscillator is compared
+to that of the Jaynes-Cummings model. The strong spin-orbit coupling of the
+Dirac oscillator produces the entanglement of the spin with the orbital motion
+similar to what is observed in the model of quantum optics. The collapses and
+revivals of the spin which result extend to a relativistic theory our previous
+findings on nonrelativistic oscillator where they were known under the name of
+`spin-orbit pendulum'. There are important relativistic effects (lack of
+periodicity, zitterbewegung, negative energy states). Many of them disappear
+after a Foldy-Wouthuysen transformation.",9903073v1
+2008-01-11,Spin-orbit effects on two-electron states in nanowhisker double quantum dots,"We investigate theoretically the combined effects of the electron-electron
+and the Rashba spin-orbit interactions on two electrons confined in
+quasi-one-dimensional AlInSb-based double quantum dots. We calculate the
+two-electron wave functions and explore the interplay between these two
+interactions on the energy levels and the spin of the states. The energy
+spectrum as a function of an applied magnetic field shows crossings and
+anticrossings between triplet and singlet states, associated with level mixing
+induced by the spin-orbit coupling. We find that the fields at which these
+crossings occur can be naturally controlled by the interdot barrier width,
+which controls the exchange integral in the structure.",0801.1808v1
+2008-02-19,Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet,"We discuss the ground state of the spin-orbital model for spin-one ions with
+partially filled $t_{2g}$ levels on a honeycomb lattice. We find that the
+orbital degrees of freedom induce a spontaneous dimerization of spins and drive
+them into nonmagnetic manifold spanned by hard-core dimer (spin-singlet)
+coverings of the lattice. The cooperative ``dimer Jahn-Teller'' effect is
+introduced through a magnetoelastic coupling and is shown to lift the
+orientational degeneracy of dimers leading to a peculiar valence bond crystal
+pattern. The present theory provides a theoretical explanation of nonmagnetic
+dimerized superstructure experimentally seen in Li$_2$RuO$_3$ compound at low
+temperatures.",0802.2692v2
+2008-10-14,Quantum information transfer from spin to orbital angular momentum of photons,"The optical ""spin-orbit"" coupling occurring in a suitably patterned
+nonuniform birefringent plate known as `q-plate' allows entangling the
+polarization of a single photon with its orbital angular momentum (OAM). This
+process, in turn, can be exploited for building a bidirectional ""spin-OAM
+interface"", capable of transposing the quantum information from the spin to the
+OAM degree of freedom of photons and \textit{vice versa}. Here, we
+experimentally demonstrate this process by single-photon quantum tomographic
+analysis. Moreover, we show that two-photon quantum correlations such as those
+resulting from coalescence interference can be successfully transferred into
+the OAM degree of freedom.",0810.2417v2
+2009-11-25,Spin-Orbit Qubits of Rare-Earth-Metal Ions in Axially Symmetric Crystal Fields,"Contrary to the well known spin qubits, rare-earth qubits are characterized
+by a strong influence of crystal field due to large spin-orbit coupling. At low
+temperature and in the presence of resonance microwaves, it is the magnetic
+moment of the crystal-field ground-state which nutates (for several $\mu$s) and
+the Rabi frequency $\Omega_R$ is anisotropic. Here, we present a study of the
+variations of $\Omega_R(\vec{H}_{0})$ with the magnitude and direction of the
+static magnetic field $\vec{H_{0}}$ for the odd $^{167}$Er isotope in a single
+crystal CaWO$_4$:Er$^{3+}$. The hyperfine interactions split the
+$\Omega_R(\vec{H}_{0})$ curve into eight different curves which are fitted
+numerically and described analytically. These ""spin-orbit qubits"" should allow
+detailed studies of decoherence mechanisms which become relevant at high
+temperature and open new ways for qubit addressing using properly oriented
+magnetic fields.",0911.4818v1
+2011-07-25,Strong Spin-Orbit Interaction and Helical Hole States in Ge/Si Nanowires,"We study theoretically the low-energy hole states of Ge/Si core/shell
+nanowires. The low-energy valence band is quasidegenerate, formed by two
+doublets of different orbital angular momenta, and can be controlled via the
+relative shell thickness and via external fields. We find that direct (dipolar)
+coupling to a moderate electric field leads to an unusually large spin-orbit
+interaction of Rashba type on the order of meV which gives rise to pronounced
+helical states enabling electrical spin control. The system allows for quantum
+dots and spin qubits with energy levels that can vary from nearly zero to
+several meV, depending on the relative shell thickness.",1107.4870v2
+2013-01-13,Theory of t2g electron-gas Rashba interactions,"The spin-degeneracy of Bloch bands in a crystal can be lifted when spin-orbit
+(SO) coupling is present and inversion symmetry is absent. In two-dimensional
+electron systems (2DES) spin-degeneracy is lifted by Rashba interaction terms -
+symmetry invariants that are scalar products of spin and orbital axial vectors.
+Rashba interactions are symmetry allowed whenever a 2DES is not invariant under
+reflections through the plane it occupies. In this paper, we use a
+tight-binding model informed by ab initio electronic structure calculations to
+develop a theory of Rashba splitting in the t2g bands of the two- dimensional
+electron systems formed at cubic perovskite crystal surfaces and interfaces. We
+find that Rashba splitting in these systems is due to atomic-like on-site SO
+interactions combined with processes in which t2g electrons change orbital
+character when they hop between metal sites. These processes are absent in a
+cubic environment and are due primarily to polar lattice distortions which
+alter the metal-oxygen-metal bond angle.",1301.2784v1
+2015-05-01,Density functional versus spin-density functional and the choice of correlated subspace in multi-variable effective action theories of electronic structure,"Modern extensions of density functional theory such as the density functional
+theory plus U and the density functional theory plus dynamical mean-field
+theory require choices, including selection of variable (charge vs spin
+density) for the density functional and specification of the correlated
+subspace. This paper examines these issues in the context of the ""plus U""
+extensions of density functional theory, in which additional correlations on
+specified correlated orbitals are treated using a Hartree-Fock approximation.
+Differences between using charge-only or spin-density-dependent
+exchange-correlation functionals and between Wannier and projector-based
+definitions of the correlated orbitals are considered on the formal level and
+in the context of the structural energetics of the rare earth nickelates. It is
+demonstrated that theories based on spin-dependent exchange-correlation
+functionals can lead to large and in some cases unphysical effective on-site
+exchange couplings. Wannier and projector-based definitions of the correlated
+orbitals lead to similar behavior near ambient pressure, but substantial
+differences are observed at large pressures. Implications for other beyond
+density functional methods such as the combination of density functional and
+dynamical mean field theory are discussed.",1505.00227v1
+2015-10-01,"Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides","Proximity orbital and spin-orbital effects of graphene on monolayer
+transition-metal dichalcogenides (TMDCs) are investigated from
+first-principles. The Dirac band structure of graphene is found to lie within
+the semiconducting gap of TMDCs for sulfides and selenides, while it merges
+with the valence band for tellurides. In the former case the proximity-induced
+staggered potential gaps and spin-orbit couplings (all on the meV scale) of the
+Dirac electrons are established by fitting to a phenomenological effective
+Hamiltonian. While graphene on MoS$_2$, MoSe$_2$, and WS$_2$ has a
+topologically trivial band structure, graphene on WSe$_2$ exhibits inverted
+bands. Using a realistic tight-binding model we find topologically protected
+helical edge states for graphene zigzag nanoribbons on WSe$_2$, demonstrating
+the quantum spin Hall effect. This model also features ""half-topological
+states"", which are protected against time-reversal disorder on one edge only.",1510.00166v1
+2016-04-26,Intrinsic spin orbit torque in a single domain nanomagnet,"We present theoretical studies of the intrinsic spin orbit torque (SOT) in a
+single domain ferromagnetic layer with Rashba spin-orbit coupling (SOC) using
+the non-equilibrium Green's function formalism for a model Hamiltonian. We find
+that, to the first order in SOC, the intrinsic SOT has only the field-like
+torque symmetry and can be interpreted as the longitudinal spin current induced
+by the charge current and Rashba field. We analyze the results in terms of the
+material related parameters of the electronic structure, such as band filling,
+band width, exchange splitting, as well as the Rashba SOC strength. On the
+basis of these numerical and analytical results, we discuss the magnitude and
+sign of SOT. Our results show that the different sign of SOT in identical
+ferromagnetic layers with different supporting layers, e.g. Co/Pt and Co/Ta,
+could be attributed to electrostatic doping of the ferromagnetic layer by the
+support.",1604.07885v2
+2020-07-13,Spin-orbit interaction of light in three-dimensional microcavities,"We investigate the spin-orbit coupling of light in three-dimensional
+cylindrical and tube-like whispering gallery mode resonators. We show that its
+origin is the transverse confinement of light in the resonator walls, even in
+the absence of inhomogeneities or anisotropies. The spin-orbit interaction
+results in elliptical far-field polarization (spin) states and causes spatial
+separation of polarization handedness in the far field. The ellipticity and
+spatial separation are enhanced for whispering gallery modes with higher
+excitation numbers along the resonator height. We analyze the asymmetry of the
+ellipticity and the tilt of the polarization orientation in the far field of
+cone-like microcavities. Furthermore, we find a direct relationship between the
+tilt of the polarization orientation in the far field and the local inclination
+of the resonator wall. Our findings are based on FDTD-simulations and are
+supported by three-dimensional diffraction theory.",2007.06721v1
+2020-04-22,Effect of phonons on the electron spin resonance absorption spectrum,"The unavoidable presence of vibrations in solid-state devices can drastically
+modify the expected electron spin resonance (ESR) absorption spectrum in
+magnetically active systems. In this work, we model the effect of phonons and
+temperature on the ESR signal in molecular systems with strong $E \otimes e$
+Jahn-Teller (JT) effect and an electronic spin-$1/2$. Our microscopic model
+considers the linear JT interaction with a continuum of phonon modes, the
+spin-orbit coupling, the Zeeman effect, and the response of the system under a
+weak oscillating magnetic field. We derive a Lindblad master equation for the
+orbital and spin degrees of freedom, where one- and two-phonon processes are
+considered for the phonon-induced relaxation, and the thermal dependence of Ham
+reduction factors is calculated. We find that the suppression of ESR signals is
+due to phonon broadening but not based on the common assumption of orbital
+quenching. Our results can be applied to explain the experimentally observed
+absence of the ESR signal in color centers in diamond, such as the neutral
+nitrogen-vacancy and negatively charged silicon-vacancy color centers in
+diamond.",2004.10355v2
+2020-12-15,Possible Spin-Density Wave on Fermi Arc of Edge State in Single-Component Molecular Conductors [Pt(dmdt)$_2$] and [Ni(dmdt)$_2$],"We construct three-orbital tight-binding models describing single-component
+molecular conductors [Pt(dmdt)$_2$] and [Ni(dmdt)$_2$] using first-principles
+calculations. We show that [Ni(dmdt)$_2$] is a Dirac nodal line system with
+highly one-dimensional edge states at the (001) edge, similar to
+[Pt(dmdt)$_2$], as demonstrated in prior studies. To investigate possible edge
+magnetism, we calculate longitudinal and transverse spin susceptibilities using
+real-space-dependent random-phase approximation (RPA) in three-orbital Hubbard
+models in the presence of spin--orbit coupling. We find that the edge
+spin-density wave (SDW) is induced by the Coulomb repulsion and incommensurate
+nestings of the Fermi arcs. We also find that the magnetic structure of the
+edge SDW can be changed via extremely small carrier doping, which is
+controllable in molecular conductors.",2012.08132v3
+2017-05-26,Photoemission Circular Dichroism and Spin Polarization of the Topological Surface States in Ultrathin Bi2Te3 Films,"Circular dichroism (CD) observed by photoemission, being sensitive to the
+orbital and spin angular momenta of the electronic states, is a powerful probe
+of the nontrivial surface states of topological insulators, but the
+experimental results thus far have eluded a comprehensive description. We
+report a study of Bi2Te3 films with thicknesses ranging from one quintuple
+layer (two-dimensional limit) to twelve layers (bulk limit) over a wide range
+of incident photon energy. The data show complex variations in magnitude and
+sign reversals, which are nevertheless well described by a theoretical
+calculation including all three photoemission mechanisms: dipole transition,
+surface photoemission, and spin-orbit coupling. The results establish the
+nontrivial connection between the spin-orbit texture and CD.",1705.09720v1
+2019-12-11,Chirality-induced linear response properties in non-coplanar Mn$_3$Ge,"Taking the non-collinear antiferromagnetic hexagonal Heusler compound
+Mn$_3$Ge as a reference system, the contributions to linear response phenomena
+arising solely from the chiral coplanar and non-coplanar spin configurations
+are investigated. Orbital moments, X-ray absorption, anomalous and spin Hall
+effects, as well as corresponding spin-orbit torques and Edelstein
+polarizations are studied depending on a continuous variation of the polar
+angle relative to the Kagome planes of corner-sharing triangles between the
+non-collinear antiferromagnetic and the ferromagnetic limits. By scaling the
+speed of light from the relativistic Dirac case to the non-relativistic limit
+the chirality-induced or topological contributions can be identified by
+suppressing the spin-orbit coupling.",1912.05211v1
+2020-10-03,Observation of quantum interference conductance fluctuations in metal rings with strong spin-orbit coupling,"We investigated the magnetotransport properties of mesoscopic platinum
+nanostructures (wires and rings) with sub-100 nm lateral dimensions at very low
+temperatures. Despite the strong spin-orbit interaction in platinum,
+oscillations of the conductance as a function of the external magnetic field
+due to quantum interference effects was found to appear. The oscillation was
+decomposed into Aharonov-Bohm periodic oscillations and aperiodic fluctuations
+of the conductance due to a magnetic flux piercing the loop of the ring and the
+metal wires forming the nanostructures, respectively. We also investigated the
+magnetotransport under different bias currents to explore the interplay between
+electron phase coherence and spin accumulation effects in strong spin-orbit
+conductors.",2010.01300v1
+2016-03-17,Dephasing measurements in InGaAs/AlInAs heterostructures: manifestations of spin-orbit and Zeeman interactions,"We have measured weak antilocalization effects, universal conductance
+fluctuations, and Aharonov-Bohm oscillations in the two-dimensional electron
+gas formed in InGaAs/AlInAs heterostructures. This system possesses strong
+spin-orbit coupling and a high Land\'{e} factor. Phase-coherence lengths of
+2$-$4 $\mu$m at 1.5$-$4.2 K are extracted from the magnetoconductance
+measurements. The analysis of the coherence-sensitive data reveals that the
+temperature dependence of the decoherence rate complies with the dephasing
+mechanism originating from electron-electron interactions in all three
+experiments. Distinct beating patterns superimposed on the Aharonov-Bohm
+oscillations are observed over a wide range of magnetic fields, up to 0.7 Tesla
+at the relatively high temperature of 1.5 K. The possibility that these beats
+are due to the interplay between the Aharonov-Bohm phase and the Berry one,
+different for electrons of opposite spins in the presence of strong spin-orbit
+and Zeeman interactions in ring geometries, is carefully investigated. It
+appears that our data are not explained by this mechanism; rather, a few
+geometrically-different electronic paths within the ring's width can account
+for the oscillations' modulations.",1603.05640v2
+2019-06-04,Observation of spin-orbit excitations and Hund's multiplets in Ca$_2$RuO$_4$,"We use Ru $L_3$-edge (2838.5 eV) resonant inelastic x-ray scattering (RIXS)
+to quantify the electronic structure of Ca$_2$RuO$_4$, a layered $4d$-electron
+compound that exhibits a correlation-driven metal-insulator transition and
+unconventional antiferromagnetism. We observe a series of Ru intra-ionic
+transitions whose energies and intensities are well described by model
+calculations. In particular, we find a $\rm{J}=0\rightarrow 2$ spin-orbit
+excitation at 320 meV, as well as Hund's-rule driven $\rm{S}=1\rightarrow 0$
+spin-state transitions at 750 and 1000 meV. The energy of these three features
+uniquely determines the spin-orbit coupling, tetragonal crystal-field energy,
+and Hund's rule interaction. The parameters inferred from the RIXS spectra are
+in excellent agreement with the picture of excitonic magnetism that has been
+devised to explain the collective modes of the antiferromagnetic state.
+$L_3$-edge RIXS of Ru compounds and other $4d$-electron materials thus enables
+direct measurements of interactions parameters that are essential for realistic
+model calculations.",1906.01221v1
+2021-10-21,Physics-Based Models for Magneto-Electric Spin-Orbit Logic Circuits,"Spintronic devices are a promising beyond-CMOS device option thanks to their
+energy efficiency and compatibility with CMOS. To accurately capture their
+multi-physics dynamics, a rigorous treatment of both spin and charge and their
+inter-conversion is required. Here we present physics-based device models based
+on 4x4 matrices for the spin-orbit coupling part of the magneto-electric
+spin-orbit (MESO) device. Also, a more rigorous physics model of ferroelectric
+and magnetoelectric switching of ferromagnets, based on Landau-Lifshitz-Gilbert
+(LLG) and Landau-Khalatnikov (LK) equations, is presented. With the combined
+model implemented in a SPICE circuit simulator environment, simulation results
+were obtained which show feasibility of MESO implementation and functional
+operation of buffers, oscillators, and majority gates.",2110.10890v1
+2023-04-11,Sensitive detection of millimeter wave electric field by driving trapped surface-state electrons,"Sensitive detection of electromagnetic wave electric field plays an important
+role for electromagnetic communication and sensing. Here, we propose a quantum
+sensor to sensitively detect the electric field of the millimeter (mm) wave.
+The quantum sensor consists of many surface-state electrons trapped
+individually on liquid helium by a scalable electrode-network at the bottom of
+the helium film. On such a chip, each of the trapped electrons can be
+manipulated by the biased dc-current to deliver the strong spin-orbit
+couplings. The mm wave signal to be detected is applied to non-dispersively
+drive the orbital states of the trapped electrons, just resulting in the Stark
+shifts of the dressed spin-orbital states. As a consequence, the electric field
+of the applied mm wave could be detected sensitively by using the spin-echo
+interferometry of the long-lived spin states of the electrons trapped on liquid
+helium. The reasonable accuracy of the detection and also the feasibility of
+the proposal are discussed.",2304.05154v1
+2023-12-21,Andreev bound states and supercurrent in disordered spin-orbit-coupled nanowire SNS-junctions,"We use a single-channel scattering formalism to derive general expressions
+for the Andreev bound-state energies and resulting current--phase relationship
+in a one-dimensional semiconductor-based SNS-junction, including arbitrarily
+oriented effective spin--orbit and Zeeman fields and taking into account
+disorder in the junction in by including a single scatterer with transmission
+probability $0 \leq T^2 \leq 1$, arbitrarily located in the normal region. We
+first corroborate our results by comparing them to the known analytic
+limiting-case expressions. Then we simplify our general result in several
+additional limits, including the case of the scatterer being at a specific
+location and the cases of small and large spin--orbit fields compared to the
+Zeeman splitting, assuming low transparency ($T\ll 1$). We believe that our
+results could be helpful for disentangling the main spin-mixing processes in
+experiments on low-dimensional semiconductor-based SNS-junctions.",2312.13833v1
+2003-07-23,A novel approach to the crystal-field theory - the orbital magnetism in 3d-ion compounds,"We point out that the orbital magnetism has to be taken into account in the
+description of real 3d-ion compounds. According to the developed by us the
+Quantum-Atomistic Solid-State (QUASST) theory in compounds containing open
+3d-/4f-/5f-shell atoms there exists a discrete atomic-like low-energy
+electronic structure that predominantly determines electronic and magnetic
+properties of the whole compound. The relatively weak intra-atomic spin-orbit
+coupling is fundamentally important as it governs the low-energy discrete
+electronic structure.",0307575v1
+2006-11-03,The Orbital Selective Mott Transition in a Three Band Hubbard model: a Slave Boson Mean Field Study,"In the present paper, we systematically studied the possible Orbital
+selective Mott transition (OSMT) in the $t_{2g}$ system, which has three
+orbital degeneracy. The slave Boson mean field theory is generalized to the
+three band systems with full Hund's rule coupling including spin flip and pair
+hopping terms. A new type of Mott transition which is driven by the crystal
+field splitting or the lattice distortion is found is this model. We argue that
+this new type of Mott transition may relate to the puzzling phase in
+$Sr_{x}Ca_{2-x}RuO_4$.",0611075v1
+2012-12-10,Effect of Gravitational Frame Dragging on Orbiting Qubits,"In this paper we discuss the effect of gravitational frame dragging on
+orbiting qubits. In particular, we consider the Kerr spacetime geometry and
+spin-1/2 qubits moving in an equatorial radial fall with zero angular momentum
+and equatorial circular orbits. We ignore the ${\cal O}(\hbar)$ order effects
+due to spin-curvature coupling, which allows us to consider the motion of the
+spin-1/2 particles as Kerr geometry geodesics. We derive analytical expressions
+for the infinitesimal Wigner rotation and numerical results for their
+integration across the length of the particle's trajectory. To this end, we
+consider the bounds on the finite Wigner rotation imposed by Penrose's cosmic
+censorship hypothesis.",1212.2200v1
+2018-05-11,Electrically Protected Valley-Orbit Qubits in Silicon,"Electrons confined in Si quantum dots possess orbital, spin, and valley
+degrees of freedom (d.o.f.). We perform Landau-Zener-Stuckelberg-Majorana
+(LZSM) interferometry on a Si double quantum dot that is strongly coupled to a
+microwave cavity to probe the valley d.o.f. The resulting LZSM interference
+pattern is asymmetric as a function of level detuning and persists for drive
+periods that are much longer than typical charge decoherence times. By
+correlating the LZSM interference pattern with charge noise measurements, we
+show that valley-orbit hybridization provides some protection from the
+deleterious effects of charge noise. Our work opens the possibility of
+harnessing the valley d.o.f. to engineer charge-noise-insensitive qubits in Si.",1805.04545v1
+2016-12-14,Analytic gradients for natural orbital functional theory,"The analytic energy gradients with respect to nuclear motion are derived for
+natural orbital functional (NOF) theory. The resulting equations do not require
+to resort to linear-response theory, so the computation of NOF energy gradients
+is analogous to gradient calculations at the Hartree-Fock level of theory. The
+structures of 15 spin-compensated systems, composed by first- and second-row
+atoms, are optimized employing the conjugate gradient algorithm. As
+functionals, two orbital-pairing approaches were used, namely, the fifth and
+sixth Piris NOFs (PNOF5 and PNOF6). For the latter, the obtained equilibrium
+geometries are compared with coupled cluster singles and doubles (CCSD)
+calculations and accurate empirical data.",1612.04673v1
+2014-11-06,Electromagnetic coupling of spins and pseudospins in bilayer graphene,"We present a detailed theoretical study of bilayer-graphene's electronic
+properties in the presence of electric and magnetic fields. Using
+group-theoretical methods, we derive an invariant expansion of the Hamiltonian
+for electron states near the K point of the Brillouin zone. In contrast to
+known materials, including single-layer graphene, any possible coupling of
+physical quantities to components of the external electric (magnetic) field has
+a counterpart where the analogous component of the magnetic (electric) field
+couples to exactly the same combination of quantities. For example, a purely
+electric spin splitting appears as the magneto-electric analogue of the
+familiar magnetic Zeeman spin splitting. The measurable thermodynamic response
+induced by magnetic and electric fields is thus completely symmetric. The Pauli
+magnetization induced by a magnetic field takes exactly the same functional
+form as the polarization induced by an electric field. Our findings thus reveal
+unconventional behavior of spin and pseudospin degrees of freedom in their
+coupling to external fields. We explain how these counterintuitive couplings
+are consistent with fundamental principles such as time reversal symmetry. For
+example, only a magnetic field can give rise to a macroscopic spin
+polarization, whereas only a perpendicular electric field can induce a
+macroscopic polarization of the sublattice-related pseudospin degree of freedom
+characterizing the intravalley orbital motion in bilayer graphene. These rules
+enforced by symmetry for the matter-field interactions clarify the nature of
+spins versus pseudospins. We also provide numerical values of prefactors for
+relevant coupling terms. While our theoretical arguments use bilayer graphene
+as an example, they are generally valid for any material with similar
+symmetries.",1411.1720v2
+2013-08-02,Cotunneling signatures of Spin-Electric coupling in frustrated triangular molecular magnets,"The ground state of frustrated (antiferromagnetic) triangular molecular
+magnets is characterized by two total-spin $S =1/2$ doublets with opposite
+chirality. According to a group theory analysis [M. Trif \textit{et al.}, Phys.
+Rev. Lett. \textbf{101}, 217201 (2008)] an external electric field can
+efficiently couple these two chiral spin states, even when the spin-orbit
+interaction (SOI) is absent. The strength of this coupling, $d$, is determined
+by an off-diagonal matrix element of the dipole operator, which can be
+calculated by \textit{ab-initio} methods [M. F. Islam \textit{et al.}, Phys.
+Rev. B \textbf{82}, 155446 (2010)]. In this work we propose that
+Coulomb-blockade transport experiments in the cotunneling regime can provide a
+direct way to determine the spin-electric coupling strength. Indeed, an
+electric field generates a $d$-dependent splitting of the ground state
+manifold, which can be detected in the inelastic cotunneling conductance. Our
+theoretical analysis is supported by master-equation calculations of quantum
+transport in the cotunneling regime. We employ a Hubbard-model approach to
+elucidate the relationship between the Hubbard parameters $t$ and $U$, and the
+spin-electric coupling constant $d$. This allows us to predict the regime in
+which the coupling constant $d$ can be extracted from experiment.",1308.0404v2
+2023-03-02,Spin-valley magnetism on the triangular moiré lattice with SU(4) breaking interactions,"The discovery of correlated insulating states in moir\'e heterostructures has
+renewed the interest in strongly-coupled electron systems where spin and valley
+(or layer) degrees of freedom are intertwined. In the strong-coupling limit,
+such systems can be effectively described by SU(4) spin-valley models akin to
+Kugel-Khomskii models long studied in the context of spin-orbit coupled
+materials. However, typical moir\'e heterostructures also exhibit interactions
+that break the SU(4) symmetry down to
+SU(2)${}_{\mathrm{spin}}\otimes$U(1)${}_{\mathrm{valley}}$. Here we investigate
+the impact of such symmetry-breaking couplings on the magnetic phase diagram
+for triangular superlattices considering a filling of two electrons (or holes)
+per moir\'e unit cell. We explore a broad regime of couplings -- including XXZ
+anisotropies, Dzyaloshinskii-Moriya exchange and on-site Hund's couplings --
+using semi-classical Monte Carlo simulations. We find a multitude of
+classically ordered phases, including (anti-)ferromagnetic, incommensurate, and
+stripe order, manifesting in different sectors of the spin-valley model's
+parameter space. Zooming in on the regimes where quantum fluctuations are
+likely to have an effect, we employ pseudo-fermion functional renormalization
+group (pf-FRG) calculations to resolve quantum disordered ground states such as
+spin-valley liquids, which we indeed find for certain parameter regimes. As a
+concrete example, we discuss the case of trilayer graphene aligned with
+hexagonal boron nitride using material-specific parameters.",2303.01244v2
+2017-01-26,Magnetic and electronic properties of La$_3M$O$_7$ and possible polaron formation in hole-doped La$_3M$O$_7$ ($M$=Ru and Os),"Oxides with $4d$/$5d$ transition metal ions are physically interesting for
+their particular crystalline structures as well as the spin-orbit coupled
+electronic structures. Recent experiments revealed a series of $4d$/$5d$
+transition metal oxides $R_3M$O$_7$ ($R$: rare earth; $M$: $4d$/$5d$ transition
+metal) with unique quasi-one-dimensional $M$ chains. Here first-principles
+calculations have been performed to study the electronic structures of
+La$_3$OsO$_7$ and La$_3$RuO$_7$. Our study confirm both of them to be Mott
+insulating antiferromagnets with identical magnetic order. The reduced magnetic
+moments, which are much smaller than the expected value for ideal high-spin
+state ($3$ $t_{2g}$ orbitals occupied), are attributed to the strong $p-d$
+hybridization with oxygen ions, instead of the spin-orbit coupling. The
+Ca-doping to La$_3$OsO$_7$ and La$_3$RuO$_7$ can not only modulate the nominal
+carrier density but also affect the orbital order as well as the local
+distortions. The Coulombic attraction and particular orbital order would prefer
+to form polarons, which might explain the puzzling insulating behavior of doped
+$5d$ transition metal oxides. In addition, our calculation predict that the
+Ca-doping can trigger ferromagnetism in La$_3$RuO$_7$ but not in La$_3$OsO$_7$.",1701.07655v1
+2019-06-10,Néel and stripe ordering from spin-orbital entanglement in $α$-Sr$_2$CrO$_4$,"The rich phenomenology engendered by the coupling between the spin and
+orbital degrees of freedom has become appreciated as a key feature of many
+strongly-correlated electron systems. The resulting emergent physics is
+particularly prominent in a number of materials, from Fe-based unconventional
+superconductors to transition metal oxides, including manganites and vanadates.
+Here, we investigate the electronic ground states of $\alpha$-Sr$_2$CrO$_4$, a
+compound that is a rare embodiment of the spin-1 Kugel-Khomskii model on the
+square lattice -- a paradigmatic platform to capture the physics of coupled
+magnetic and orbital electronic orders. We have used resonant X-ray diffraction
+at the Cr-$K$ edge to reveal N\'{e}el magnetic order at the in-plane wavevector
+$\mathbf{Q}_N = (1/2, 1/2)$ below $T_N = 112$ K, as well as an additional
+electronic order at the 'stripe' wavevector $\mathbf{Q}_s = (1/2, 0)$ below
+T$_s$ $ \sim 50$ K. These findings are examined within the framework of the
+Kugel-Khomskii model by a combination of mean-field and Monte-Carlo approaches,
+which supports the stability of the spin N\'{e}el phase with subsequent
+lower-temperature stripe orbital ordering, revealing a candidate mechanism for
+the experimentally observed peak at $\mathbf{Q}_s$. On the basis of these
+findings, we propose that $\alpha$-Sr$_2$CrO$_4$ serves as a new platform in
+which to investigate multi-orbital physics and its role in the low-temperature
+phases of Mott insulators.",1906.04194v2
+2022-11-02,Pressure-induced dimerization and molecular orbitals formation in Na2RuO3 with strong correlation-enhanced spin-orbit coupling effect,"First-principles calculations and simulations are conducted to clarify the
+nonmagnetic insulating ground state of the honeycomb lattice compound Na2RuO3
+with 4d^4 electronic configuration and explore the evolutions of crystal
+structure and electronic property under pressure. We reveal that individual
+Coulomb correlation or spin-orbit coupling (SOC) effect cannot reproduce the
+experimentally observed nonmagnetic insulating behavior of Na2RuO3, whereas the
+Coulomb correlation enhanced SOC interactions give rise to an unusual
+spin-orbital-entangled J = 0 nonmagnetic insulating state, which contrasts with
+the SOC assisted Mott insulating state in d^5 ruthenates and iridates.
+Furthermore, a pressure-induced structural dimerization transition has been
+predicted around 15-17.5 GPa. The honeycomb lattice of the high-pressure
+dimerized phase features with parallel pattern of the short Ru-Ru dimers
+aligning along the crystallographic b direction. Accompanied with the
+structural dimerization, the electronic structure shows striking reconstruction
+by formation of molecular orbitals. Interestingly, the cooperation of Coulomb
+correlation together with SOC can realize a nonmagnetic insulating state in the
+high-pressure dimerized phase. The d^4 ruthenate Na2RuO3 with honeycomb lattice
+will provide a new platform to explore unusual physics and rich phase diagram
+due to the delicate interplay of lattice degree of freedom, electron
+correlations, and SOC interactions.",2211.00811v2
+2023-12-15,Probing the Mott-insulating behavior of Ba$_2$MgReO$_6$ with DFT+DMFT,"We investigate the interplay of spin-orbit coupling, electronic correlations,
+and lattice distortions in the $5d^1$ double perovskite Ba$_2$MgReO$_6$.
+Combining density-functional theory (DFT) and dynamical mean-field theory
+(DMFT), we establish the Mott-insulating character of Ba$_2$MgReO$_6$ in both
+its cubic and tetragonal paramagnetic phases. Despite substantial spin-orbit
+coupling, its impact on the formation of the insulating state is minimal,
+consistent with theoretical expectations for $d^1$ systems. We further
+characterize the electronic properties of the cubic and tetragonal phases by
+analyzing spectral functions and local occupations in terms of multipole
+moments centered on the Re sites. Our results confirm the presence of
+ferroically ordered $z^2$ quadrupoles in addition to the antiferroic
+$x^2-y^2$-type order. We compare two equivalent but complementary descriptions
+in terms of either effective Re-\ttg frontier orbitals or more localized
+atomic-like Re-d and O-p orbitals. The former maps directly on a physically
+intuitive picture in terms of nominal $d^1$ Re cations, while the latter
+explicitly demonstrates the role of hybridization with the ligands in the
+spin-orbit splitting and the formation of the charge quadrupoles around the Re
+sites. Finally, we compare our DFT+DMFT results with a previous DFT+$U$ study
+of the tetragonal paramagnetic state. We find good qualitative agreement for
+the dominant charge quadrupoles, but also notable differences in the
+corresponding spectral functions, underscoring the need for more comparative
+studies between these two methods.",2312.09839v1
+2020-09-25,"A Unified Description of Spin Transport, Weak Antilocalization and Triplet Superconductivity in Systems with Spin-Orbit Coupling","The Eilenberger equation is a standard tool in the description of
+superconductors with an arbitrary degree of disorder. It can be generalized to
+systems with linear-in-momentum spin-orbit coupling (SOC), by exploiting the
+analogy of SOC with a non-abelian background field. Such field mixes singlet
+and triplet components and yields the rich physics of magnetoelectric
+phenomena. In this work we show that the application of this equation extends
+further, beyond superconductivity. In the normal state, the linearized
+Eilenberger equation describes the coupled spin-charge dynamics. Moreover, its
+resolvent corresponds to the so called Cooperons, and can be used to calculate
+the weak localization corrections. Specifically, we show how to solve this
+equation for any source term and provide a closed-form solution for the case of
+Rashba SOC. We use this solution to address several problems of interest for
+spintronics and superconductivity. Firstly, we study spin injection from
+ferromagnetic electrodes in the normal state, and describe the spatial
+evolution of spin density in the sample, and the complete crossover from the
+diffusive to the ballistic limit. Secondly, we address the so-called
+superconducting Edelstein effect, and generalize the previously known results
+to arbitrary disorder. Thirdly, we study weak localization correction beyond
+the diffusive limit, which can be a valuable tool in experimental
+characterization of materials with very strong SOC. We also address the
+so-called pure gauge case where the persistent spin helices form. Our work
+establishes the linearized Eilenberger equation as a powerful and a very
+versatile method for the study of materials with spin-orbit coupling, which
+often provides a simpler and more intuitive picture compared to alternative
+methods.",2009.12321v1
+2022-09-28,Temperature Dependent Zero-Field Splittings in Graphene,"Graphene is a quantum spin Hall insulator with a 45 $\mu$eV wide non-trivial
+topological gap induced by the intrinsic spin-orbit coupling. Even though this
+zero-field spin splitting is weak, it makes graphene an attractive candidate
+for applications in quantum technologies, given the resulting long spin
+relaxation time. On the other side, the staggered sub-lattice potential,
+resulting from the coupling of graphene with its boron nitride substrate,
+compensates intrinsic spin-orbit coupling and decreases the non-trivial
+topological gap, which may lead to the phase transition into trivial band
+insulator state. In this work, we present extensive experimental studies of the
+zero-field splittings in monolayer and bilayer graphene in a temperature range
+2K-12K by means of sub-Terahertz photoconductivity-based electron spin
+resonance technique. Surprisingly, we observe a decrease of the spin splittings
+with increasing temperature. We discuss the origin of this phenomenon by
+considering possible physical mechanisms likely to induce a temperature
+dependence of the spin-orbit coupling. These include the difference in the
+expansion coefficients between the graphene and the boron nitride substrate or
+the metal contacts, the electron-phonon interactions, and the presence of a
+magnetic order at low temperature. Our experimental observation expands
+knowledge about the non-trivial topological gap in graphene.",2209.14001v2
+2023-12-27,Topological phase transitions induced by the variation of exchange couplings in graphene,"We consider a modified graphene model under exchange couplings. Various
+quantum anomalous phases are known to emerge under uniform or staggered
+exchange couplings. We introduce the twist between the orientations of two
+sublattice exchange couplings, which is useful for examining how such
+topologically nontrivial phases under different types of exchange couplings are
+connected to one another. The phase diagrams constructed by the variation of
+exchange coupling strengths and twist angles exhibit rich structures of
+successive topological transitions. We analyze the emergence of peculiar phases
+in terms of the evolution of the energy dispersions. Perturbation schemes
+applied to the energy levels turn out to reproduce well phase boundary lines up
+to moderate values of the twist angle. We also discover two close topological
+transitions under uniform exchange couplings, which is attributed to the
+interplay of the trigonal-warping deformation due to Rashba spin-orbit coupling
+and the staggered sublattice potential. Finally the implications of Berry
+curvature structure and topological excitations in real and pseudo spin
+textures are discussed.",2312.16625v2
+2018-04-05,"Spin-orbit coupled systems in the ""atomic"" limit: rhenates, osmates, iridates","Motivated by RIXS experiments on a wide range of complex heavy oxides,
+including rhenates, osmates, and iridates, we discuss the theory of RIXS for
+site-localized $t_{2g}$ orbital systems with strong spin-orbit coupling. For
+such systems, we present exact diagonalization results for the spectrum at
+different electron fillings, showing that it accesses ""single-particle"" and
+""multi-particle"" excitations. This leads to a simple picture for the energies
+and intensities of the RIXS spectra in Mott insulators such as double
+perovskites which feature highly localized electrons, and yields estimates of
+the spin-orbit coupling and Hund's coupling in correlated $5d$ oxides. We
+present new higher resolution RIXS data at the Re-L$_3$ edge in Ba$_2$YReO$_6$
+which finds a previously unresolved peak splitting, providing further
+confirmation of our theoretical predictions. Using ab initio electronic
+structure calculations on Ba$_2$${\cal M}$ReO$_6$ (with ${\cal M}$=Re, Os, Ir)
+we show that while the atomic limit yields a reasonable effective Hamiltonian
+description of the experimental observations, effects such as $t_{2g}$-$e_g$
+interactions and hybridization with oxygen are important. Our ab initio
+estimate for the strength of the intersite exchange coupling shows that,
+compared to the osmates, the exchange is one or two orders of magnitude weaker
+in the rhenates and iridates, which may partly explain the suppression of
+long-range magnetic order in the latter compounds. As a way to interpolate
+between the site-localized picture and our electronic structure band
+calculations, we discuss the spin-orbital levels of the ${\cal M}$O$_6$
+cluster. This suggests a possible role for non-dispersive intra-cluster
+excitons in Ba$_2$YIrO$_6$ which may lead to a weak breakdown of the atomic
+$J_{\rm eff}=0$ picture and to small magnetic moments.",1804.02006v2
+2008-11-20,Metal-Insulator Transition and Orbital Order in PbRuO3,"Anomalous low temperature electronic and structural behaviour has been
+discovered in PbRuO3. The structure (space group Pnma, a = 5.56314(1), b =
+7.86468(1), c = 5.61430(1) A) and metallic conductivity at 290 K are similar to
+those of SrRuO3 and other ruthenate perovskites, but a sharp metal-insulator
+transition at which the resistivity increases by four orders of magnitude is
+discovered at 90 K. This is accompanied by a first order structural transition
+to an Imma phase (a = 5.56962(1), b = 7.74550(1), c = 5.66208(1) A at 25 K)
+that shows a coupling of Ru4+ 4d orbital order to distortions from Pb2+ 6s6p
+orbital hybridization. The Pnma to Imma transition is an unconventional
+reversal of the group-subgroup symmetry relationship. No long range magnetic
+order is evident down to 1.5 K. Electronic structure calculations show that
+hybridization of Pb 6s6p and Ru 4d orbitals and strong spin-orbit coupling
+stabilise this previously hidden ground state for ruthenate perovskites",0811.3378v1
+2011-05-29,Trimer Formation and Metal-Insulator Transition in Orbital Degenerate Systems on a Triangular Lattice,"As a prototypical self-organization in the system with orbital degeneracy, we
+theoretically investigate trimer formation on a triangular lattice, as observed
+in LiVO2. From the analysis of an effective spin-orbital coupled model in the
+strong correlation limit, we show that the previously-proposed orbital-ordered
+trimer state is not the lowest-energy state for a finite Hund's-rule coupling.
+Instead, exploring the ground state in a wide range of parameters for a
+multiorbital Hubbard model, we find an instability toward a different
+orbital-ordered trimer state in the intermediately correlated regime in the
+presence of trigonal crystal field. The trimer phase appears in the competing
+region among a paramagnetic metal, band insulator, and Mott insulator. The
+underlying mechanism is nesting instability of the Fermi surface by a
+synergetic effect of Coulomb interactions and trigonal-field splitting. The
+results are compared with experiments in triangularlattice compounds, LiVX2
+(X=O, S, Se) and NaVO2.",1105.5757v1
+2014-01-16,Functionalized Germanene as a Prototype of Large-Gap Two-Dimensional Topological Insulators,"We propose new two-dimensional (2D) topological insulators (TIs) in
+functionalized germanenes (GeX, X=H, F, Cl, Br or I) using first-principles
+calculations. We find GeI is a 2D TI with a bulk gap of about 0.3 eV, while
+GeH, GeF, GeCl and GeBr can be transformed into TIs with sizeable gaps under
+achievable tensile strains. A unique mechanism is revealed to be responsible
+for large topologically-nontrivial gap obtained: owing to the
+functionalization, the $\sigma$ orbitals with stronger spin-orbit coupling
+(SOC) dominate the states around the Fermi level, instead of original $\pi$
+orbitals with weaker SOC; thereinto, the coupling of the $p_{xy}$ orbitals of
+Ge and heavy halogens in forming the $\sigma$ orbitals also plays a key role in
+the further enlargement of the gaps in halogenated germanenes. Our results
+suggest a realistic possibility for the utilization of topological effects at
+room temperature.",1401.4100v1
+2015-05-20,"Orbital Arrangements and Magnetic Interactions in the Quasi-One-Dimensional Cuprates ACuMoO_4(OH) (A = Na, K)","A new spin-1/2 quasi-one-dimensional antiferromagnet KCuMoO_4(OH) is prepared
+by the hydrothermal method. The crystal structures of KCuMoO_4(OH) and the
+already-known Na-analogue, NaCuMoO_4(OH), are isotypic, comprising chains of
+Cu^{2+} ions in edge-sharing CuO_4(OH)_2 octahedra. Despite the structural
+similarity, their magnetic properties are quite different because of the
+different arrangements of d_{x2-y2} orbitals carrying spins. For NaCuMoO_4(OH),
+d_{x2-y2} orbitals are linked by superexchange couplings via two bridging oxide
+ions, which gives a ferromagnetic nearest-neighbor interaction J_1 of -51 K and
+an antiferromagnetic next-nearest-neighbor interaction J_2 of 36 K in the
+chain. In contrast, a staggered d_{x2-y2} orbital arrangement in KCuMoO_4(OH)
+results in superexchange couplings via only one bridging oxide ion, which makes
+J_1 antiferromagnetic as large as 238 K and J_2 negligible. This comparison
+between the two isotypic compounds demonstrates an important role of orbital
+arrangements in determining the magnetic properties of cuprates.",1505.05332v1
+2020-07-22,Orbital period modulation in hot Jupiter systems,"We introduce a model for the orbital period modulation in systems with
+close-by giant planets based on a spin-orbit coupling that transfers angular
+momentum from the orbit to the rotation of the planet and viceversa. The
+coupling is produced by a permanent non-axisymmetric gravitational quadrupole
+moment assumed to be present in the solid core of the planet. We investigate
+two regimes of internal planetary rotation, that is, when the planet rotates
+rigidly and when the rotation of its deep interior is time dependent as a
+consequence of a vacillating or intermittent convection in its outer shell. The
+model is applied to a sample of very hot Jupiters predicting maximum
+transit-time deviations from a constant-period ephemeris of approximately 50
+seconds in the case of rigid rotation. The transit time variations of WASP-12,
+currently the only system showing evidence of a non-constant period, cannot be
+explained by assuming rigid rotation, but can be modelled in the time-dependent
+internal rotation regime, thus providing an alternative to their interpretation
+in terms of a tidal decay of the planet orbit.",2007.11264v1
+2013-05-01,Ballistic spin transport in exciton gases,"Traditional spintronics relies on spin transport by charge carriers, such as
+electrons in semiconductor crystals. This brings several complications: the
+Pauli principle prevents the carriers from moving with the same speed; Coulomb
+repulsion leads to rapid dephasing of electron flows. Spin-optronics is a
+valuable alternative to traditional spintronics. In spin-optronic devices the
+spin currents are carried by electrically neutral bosonic quasi-particles:
+excitons or exciton-polaritons. They can form highly coherent quantum liquids
+and carry spins over macroscopic distances. The price to pay is a finite
+life-time of the bosonic spin carriers. We present the theory of exciton
+ballistic spin transport which may be applied to a range of systems where
+bosonic spin transport has been reported, in particular, to indirect excitons
+in coupled GaAs/AlGaAs quantum wells. We describe the effect of spin-orbit
+interaction of electrons and holes on the exciton spin, account for the Zeeman
+effect induced by external magnetic fields, long range and short range exchange
+splittings of the exciton resonances. We also consider exciton transport in the
+non-linear regime and discuss the definitions of exciton spin current,
+polarization current and spin conductivity.",1305.0133v3
+2017-06-11,Transport theory for electrical detection of the spin texture and spin-momentum locking of topological surface states,"The surface states of three-dimensional topological insulators exhibit a
+helical spin texture with spin locked to momentum. To date, however, the direct
+all-electrical detection of the helical spin texture has remained elusive owing
+to the lack of necessary spin-sensitive measurements. We here provide a general
+theory for spin polarized transports of helical Dirac electrons through
+spin-polarized scanning tunneling microscopy (STM). It is found that different
+from conventional magnetic materials, the tunneling conductance through the TI
+surface acquires an extra component determined by the in-plane spin texture,
+exclusively associated with spin momentum locking. Importantly, this extra
+conductance unconventionally depends on the spatial azimuthal angle of the
+magnetized STM tip, which is never carried out in previous STM theory. By
+magnetically doping to break the symmetry of rotation and time reversal of the
+TI surface, we find that the measurement of the spatial resolved conductance
+can reconstruct the helical structure of spin texture. Furthermore, one can
+extract the SML angle if the in-plane magnetization is induced purely by the
+spin-orbit coupling of surface Dirac elections. Our theory offers an
+alternative way, rather than using angle resolved photoemission spectroscopy,
+to electrical identify the helical spin texture on TI surfaces.",1706.03379v1
+2018-07-10,Interfacial spin Hall effect and spin swapping in Fe|Au bilayer from first principles,"The interfaces in hybridized structures could give rise to rich phenomena,
+which open the way to novel devices with extraordinary performance. Here, we
+investigate the interface-related spin transport properties in Fe|Au bilayer
+based on first-principle calculation. We find that the spin Hall current in the
+Au side near the interface flows in the opposite direction to the bulk spin
+Hall current with the magnitude sensitive to the magnetization direction of Fe.
+This negative interfacial contribution is attributed to the spin dependent
+transmission within a few atomic layers, where a strong interfacial Rashba
+spin-orbit coupling exists. Surprisingly, the interfacial spin Hall currents
+are found to be not confined at the interface but extend tens of nanometers at
+low temperature, which is limited by momentum scattering and therefore much
+shorter than the spin diffusion length. In addition, the interfacial swapping
+spin currents, as a consequence of the spin precession under the interfacial
+Rashba field, are also obtained from our calculation and complete the full spin
+transport picture with all non-vanishing components. Our results suggest the
+importance of the interface engineering in spin-related transport in
+ferromagnetic|non-magnetic heterostructures and the possibility of manipulating
+the interfacial transport by the magnetization orientation of the magnetic
+layer.",1807.03433v1
+2019-02-01,Photoinduced Rashba spin to charge conversion via interfacial unoccupied state,"At interfaces with inversion symmetry breaking, Rashba effect couples the
+motion of electrons to their spin; as a result, spin-charge interconversion
+mechanism can occur. These interconversion mechanisms commonly exploit Rashba
+spin splitting at the Fermi level by spin pumping or spin torque ferromagnetic
+resonance. Here, we report evidence of significant photoinduced spin to charge
+conversion via Rashba spin splitting in an unoccupied state above the Fermi
+level at the Cu(111)/$\alpha$-Bi$_{2}$O$_{3}$ interface. We predict an average
+Rashba coefficient of $1.72\times 10^{-10}eV.m$ at 1.98 eV above the Fermi
+level, by fully relativistic first-principles analysis of the interfacial
+electronic structure with spin orbit interaction. We find agreement with our
+observation of helicity dependent photoinduced spin to charge conversion
+excited at 1.96 eV at room temperature, with spin current generation of
+$J_{s}=10^{6}A/m^{2}$. The present letter shows evidence of efficient
+spin-charge conversion exploiting Rashba spin splitting at excited states,
+harvesting light energy without magnetic materials or external magnetic fields.",1902.00237v2
+2017-07-14,Spin-momentum locked interaction between guided photons and surface electrons in topological insulators,"The propagation of electrons and photons can respectively have the
+spin-momentum locking effect which correlates the spin with the linear
+momentum. For the surface electrons in three-dimensional topological insulators
+(TIs), their spin is locked to the transport direction. For photons in optical
+fibers and photonic waveguides, they carry transverse spin angular momentum
+(SAM) which is also locked to the propagation direction. A direct connection
+between the electronic and the optical spins occurs in TIs with lifted spin
+degeneracy, which leads to spin-dependent selection rules of optical
+transitions and results in phenomena such as circular photogalvanic effect
+(CPGE). Here, we demonstrate an optoelectronic device that integrates a TI with
+a photonic waveguide. Interaction between the photons in the
+transverse-magnetic (TM) mode of the waveguide, which carries transverse SAM,
+and the surface electrons in a Bi2Se3 layer generates a directional,
+spin-polarized photocurrent. Because of optical spin-momentum locking, the
+device works in a non-reciprocal way such that changing the light propagation
+direction reverses the photon spin and thus the direction of the photocurrent
+in the TI. This novel device provides a directional interface that directly
+converts the photon propagation path to the direction and spin polarization of
+the photo-excited surface current in the TI. It represents a new way of
+implementing coupled spin-orbit interaction between electrons and photons and
+may lead to significant applications in opto-spintronics and quantum
+information processing.",1707.04559v2
+2019-05-03,Charge-to-Spin Conversion by the Rashba-Edelstein Effect in 2D van der Waals Heterostructures up to Room Temperature,"The proximity of a transition metal dichalcogenide (TMD) to graphene imprints
+a rich spin texture in graphene and complements its high quality charge/spin
+transport by inducing spin-orbit coupling (SOC). Rashba and valley-Zeeman SOCs
+are the origin of charge-to-spin conversion mechanisms such as Rashba-Edelstein
+effect (REE) and spin Hall effect (SHE). In this work, we experimentally
+demonstrate for the first time charge-to-spin conversion due to the REE in a
+monolayer WS2-graphene van der Waals heterostructure. We measure the
+current-induced spin polarization up to room temperature and control it by a
+gate electric field. Our observation of the REE and inverse of the effect
+(IREE) is accompanied by the SHE which we discriminate by symmetry-resolved
+spin precession under oblique magnetic fields. These measurements also allow
+for quantification of the efficiencies of charge-to-spin conversion by each of
+the two effects. These findings are a clear indication of induced Rashba and
+valley-Zeeman SOC in graphene that lead to generation of spin accumulation and
+spin current without using ferromagnetic electrodes. These realizations have
+considerable significance for spintronic applications, providing accessible
+routes towards all-electrical spin generation and manipulation in
+two-dimensional materials.",1905.01371v1
+2020-09-06,Adiabatic and Nonadiabatic Spin-transfer Torques in Antiferromagnets,"Electron transport in magnetic orders and the magnetic orders dynamics have a
+mutual dependence, which provides the key mechanisms in spin-dependent
+phenomena. Recently, antiferromagnetic orders are focused on as the magnetic
+order, where current-induced spin-transfer torques, a typical effect of
+electron transport on the magnetic order, have been debatable mainly because of
+the lack of an analytic derivation based on quantum field theory. Here, we
+construct the microscopic theory of spin-transfer torques on the slowly-varying
+staggered magnetization in antiferromagnets with weak canting. In our theory,
+the electron is captured by bonding/antibonding states, each of which is the
+eigenstate of the system, doubly degenerates, and spatially spreads to
+sublattices because of electron hopping. The spin of the eigenstates depends on
+the momentum in general, and a nontrivial spin-momentum locking arises for the
+case with no site inversion symmetry, without considering any spin-orbit
+couplings. The spin current of the eigenstates includes an anomalous component
+proportional to a kind of gauge field defined by derivatives in momentum space
+and induces the adiabatic spin-transfer torques on the magnetization.
+Unexpectedly, we find that one of the nonadiabatic torques has the same form as
+the adiabatic spin-transfer torque, while the obtained forms for the adiabatic
+and nonadiabatic spin-transfer torques agree with the phenomenological
+derivation based on the symmetry consideration. This finding suggests that the
+conventional explanation for the spin-transfer torques in antiferromagnets
+should be changed. Our microscopic theory provides a fundamental understanding
+of spin-related physics in antiferromagnets.",2009.02686v1
+2004-05-20,Optimal Axes of Siberian Snakes for Polarized Proton Acceleration,"Accelerating polarized proton beams and storing them for many turns can lead
+to a loss of polarization when accelerating through energies where a spin
+rotation frequency is in resonance with orbit oscillation frequencies.
+First-order resonance effects can be avoided by installing Siberian Snakes in
+the ring, devices which rotate the spin by 180 degrees around the snake axis
+while not changing the beam's orbit significantly. For large rings, several
+Siberian Snakes are required.
+  Here a criterion will be derived that allows to find an optimal choice of the
+snake axes. Rings with super-period four are analyzed in detail, and the HERA
+proton ring is used as an example for approximate four-fold symmetry. The
+proposed arrangement of Siberian Snakes matches their effects so that all
+spin-orbit coupling integrals vanish at all energies and therefore there is no
+first-order spin-orbit coupling at all for this choice, which I call snakes
+matching. It will be shown that in general at least eight Siberian Snakes are
+needed and that there are exactly four possibilities to arrange their axes.
+When the betatron phase advance between snakes is chosen suitably, four
+Siberian Snakes can be sufficient.
+  To show that favorable choice of snakes have been found, polarized protons
+are tracked for part of HERA-p's acceleration cycle which shows that
+polarization is preserved best for the here proposed arrangement of Siberian
+Snakes.",0405109v1
+2009-06-03,Non-local mean field effect on nuclei near Z=64 sub-shell,"Evolutions of single-particle energies and Z=64 sub-shell along the isotonic
+chain of N=82 are investigated in the density dependent relativistic
+Hartree-Fock (DDRHF) theory in comparison with other commonly used mean field
+models such as Skyrme HF, Gogny HFB and density dependent relativistic Hartree
+model (DDRMF). The pairing is treated in the BCS scheme, except for Gogny HFB.
+It is pointed out that DDRHF reproduces well characteristic features of
+experimental $Z$-dependence of both spin orbital and pseudo-spin orbital
+splittings around the sub-shell closure Z=64. Non-local exchange terms of the
+isoscalar $\sigma$ and $\omega$ couplings play dominant roles in the
+enhancements of the spin-orbit splitting of proton 2d states, which is the key
+ingredient to give the Z=64 sub-shell closure properly. On the other hand, the
+$\pi$ and $\rho$ tensor contributions for the spin-orbit splitting cancel each
+other and the net effect becomes rather small. The enhancement of the sub-shell
+gaps towards Z=64 is studied by the DDRHF, for which the local terms of the
+scalar and vector meson couplings are found to be important.",0906.0636v1
+2013-03-08,Ab initio analysis of the tight-binding parameters and magnetic interactions in Na2IrO3,"By means of density functional theory (DFT) calculations (with and without
+inclusion of spin-orbit (SO) coupling) we present a detailed study of the
+electronic structure and corresponding microscopic Hamiltonian parameters of
+Na2IrO3. In particular, we address the following aspects: (i) We investigate
+the role of the various structural distortions and show that the electronic
+structure of Na2IrO3 is exceptionally sensitive to structural details. (ii) We
+discuss both limiting descriptions for Na2IrO3; quasi-molecular orbitals (small
+SO limit, itinerant) versus relativistic orbitals (large SO limit, localized)
+and show that the description of Na2IrO3 lies in an intermediate regime. (iii)
+We investigate whether the nearest neighbor Kitaev-Heisenberg model is
+sufficient to describe the electronic structure and magnetism in Na2IrO3. In
+particular, we verify the recent suggestion of an antiferromagnetic Kitaev
+interaction and show that it is not consistent with actual or even plausible
+electronic parameters. Finally, (iv) we discuss correlation effects in Na2IrO3.
+We conclude that while the Kitaev-Heisenberg Hamiltonian is the most general
+expression of the quadratic spin-spin interaction in the presence of spin-orbit
+coupling (neglecting single-site anisotropy), the itinerant character of the
+electrons in Na2IrO3 makes other terms beyond this model (including, but not
+limited to 2nd and 3rd neighbor interactions) essential.",1303.2105v2
+2013-03-24,Compass and Kitaev models -- Theory and Physical Motivations,"Compass models are theories of matter in which the couplings between the
+internal spin (or other relevant field) components are inherently spatially
+(typically, direction) dependent. Compass-type interactions appear in diverse
+physical systems including Mott insulators with orbital degrees of freedom
+(where interactions sensitively depend on the spatial orientation of the
+orbitals involved), the low energy effective theories of frustrated quantum
+magnets, systems with strong spin-orbit couplings (such as the iridates),
+vacancy centers, and cold atomic gases. Kitaev's models, in particular the
+compass variant on the honeycomb lattice, realize basic notions of topological
+quantum computing. The fundamental inter-dependence between internal (spin,
+orbital, or other) and external (i.e., spatial) degrees of freedom which
+underlies compass models generally leads to very rich behaviors including the
+frustration of (semi-)classical ordered states on non-frustrated lattices and
+to enhanced quantum effects prompting, in certain cases, the appearance of zero
+temperature quantum spin liquids. As a consequence of these frustrations, new
+types of symmetries and their associated degeneracies may appear. These
+intermediate symmetries lie midway between the extremes of global symmetries
+and local gauge symmetries and lead to effective dimensional reductions. We
+review compass models in a unified manner, paying close attention to exact
+consequences of these symmetries, and to thermal and quantum fluctuations that
+stabilize orders via order out of disorder effects. We review non-trivial
+statistics and the appearance of topological quantum orders in compass systems
+in which, by virtue of their intermediate symmetry standard orders do not
+arise. This is complemented by a survey of numerical results. Where appropriate
+theoretical and experimental results are compared.",1303.5922v1
+2014-01-15,Formation of quantum spin Hall state on Si surface and energy gap scaling with strength of spin orbit coupling,"For potential applications in spintronics and quantum computing, it is
+desirable to place a quantum spin Hall insulator [i.e., a 2D topological
+insulator (TI)] on a substrate while maintaining a large energy gap. Here, we
+demonstrate a unique approach to create the large-gap 2D TI state on a
+semiconductor surface, based on first-principles calculations and effective
+Hamiltonian analysis. We show that when heavy elements with strong spin orbit
+coupling (SOC) such as Bi and Pb atoms are deposited on a patterned H-Si(111)
+surface into a hexagonal lattice, they exhibit a 2D TI state with a large
+energy gap of over 0.5 eV. The TI state arises from an intriguing substrate
+orbital filtering effect that selects a suitable orbital composition around the
+Fermi level, so that the system can be matched onto a four-band effective model
+Hamiltonian. Furthermore, it is found that within this model, the SOC gap does
+not increase monotonically with the increasing strength of SOC. These
+interesting results may shed new light in future design and fabrication of
+large-gap topological quantum states.",1401.3392v2
+2014-12-02,Interplay of spin-orbit torque and thermoelectric effects in ferromagnet/normal metal bilayers,"We present harmonic transverse voltage measurements of current-induced
+thermoelectric and spin-orbit torque (SOT) effects in ferromagnet/normal metal
+bilayers, in which thermal gradients produced by Joule heating and SOT coexist
+and give rise to ac transverse signals with comparable symmetry and magnitude.
+Based on the symmetry and field-dependence of the transverse resistance, we
+develop a consistent method to separate thermoelectric and SOT measurements. By
+addressing first ferromagnet/light metal bilayers with negligible spin-orbit
+coupling, we show that in-plane current injection induces a vertical thermal
+gradient whose sign and magnitude are determined by the resistivity difference
+and stacking order of the magnetic and nonmagnetic layers. We then study
+ferromagnet/heavy metal bilayers with strong spin-orbit coupling, showing that
+second harmonic thermoelectric contributions to the transverse voltage may lead
+to a significant overestimation of the antidamping SOT. We find that
+thermoelectric effects are very strong in Ta(6nm)/Co(2.5nm) and negligible in
+Pt(6nm)/Co(2.5nm) bilayers. After including these effects in the analysis of
+the transverse voltage, we find that the antidamping SOTs in these bilayers,
+after normalization to the magnetization volume, are comparable to those found
+in thinner Co layers with perpendicular magnetization, whereas the field-like
+SOTs are about an order of magnitude smaller.",1412.0865v1
+2015-03-04,Signature of strong spin-orbital coupling in the large non-saturating magnetoresistance material WTe2,"We report the detailed electronic structure of WTe$_2$ by high resolution
+angle-resolved photoemission spectroscopy. Unlike the simple one electron plus
+one hole pocket type of Fermi surface topology reported before, we resolved a
+rather complicated Fermi surface of WTe$_2$. Specifically, there are totally
+nine Fermi pockets, including one hole pocket at the Brillouin zone center
+$\Gamma$, and two hole pockets and two electron pockets on each side of
+$\Gamma$ along the $\Gamma$-$X$ direction. Remarkably, we have observed
+circular dichroism in our photoemission spectra, which suggests that the
+orbital angular momentum exhibits a rich texture at various sections of the
+Fermi surface. As reported previously for topological insulators and Rashiba
+systems, such a circular dichroism is a signature for spin-orbital coupling
+(SOC). This is further confirmed by our density functional theory calculations,
+where the spin texture is qualitatively reproduced as the conjugate consequence
+of SOC. Since the backscattering processes are directly involved with the
+resistivity, our data suggest that the SOC and the related spin and orbital
+angular momentum textures may be considered in the understanding of the
+anomalous magnetoresistance of WTe$_2$.",1503.01422v1
+2019-10-29,"Giant proximity exchange and valley splitting in transition metal dichalcogenide/$h\mathrm{BN}$/(Co, Ni) heterostructures","We investigate the proximity-induced exchange coupling in transition-metal
+dichalcogenides (TMDCs), originating from spin injector geometries composed of
+hexagonal boron-nitride (hBN) and ferromagnetic (FM) cobalt (Co) or nickel
+(Ni), from first-principles. We employ a minimal tight-binding Hamiltonian that
+captures the low energy bands of the TMDCs around K and K' valleys, to extract
+orbital, spin-orbit, and exchange parameters. The TMDC/hBN/FM heterostructure
+calculations show that due to the hBN buffer layer, the band structure of the
+TMDC is preserved, with an additional proximity-induced exchange splitting in
+the bands. We extract proximity exchange parameters in the 1--10 meV range,
+depending on the FM. The combination of proximity-induced exchange and
+intrinsic spin-orbit coupling (SOC) of the TMDCs, leads to a valley
+polarization, translating into magnetic exchange fields of tens of Tesla. The
+extracted parameters are useful for subsequent exciton calculations of TMDCs in
+the presence of a hBN/FM spin injector. Our calculated absorption spectra show
+large splittings for the exciton peaks; in the case of MoS$_2$/hBN/Co we find a
+value of about 8 meV, corresponding to about 50 Tesla external magnetic field
+in bare TMDCs. The reason lies in the band structure, where a hybridization
+with Co $d$ orbitals causes a giant valence band exchange splitting of more
+than 10 meV. Structures with Ni do not show any $d$ level hybridization
+features, but still sizeable proximity exchange and exciton peak splittings of
+around 2 meV are present in the TMDCs.",1910.13223v2
+2020-02-18,BCS-BEC crossover in a $(t_{2g})^4$ Excitonic Magnet,"The condensation of spin-orbit-induced excitons in $(t_{2g})^4$ electronic
+systems is attracting considerable attention. In the large Hubbard U limit,
+antiferromagnetism was proposed to emerge from the Bose-Einstein Condensation
+(BEC) of triplons ($J_{\textrm{eff}} = 1$). In this publication, we show that
+even for the weak and intermediate U regimes, the spin-orbit exciton
+condensation is possible leading also to staggered magnetic order. The
+canonical electron-hole excitations (excitons) transform into local triplon
+excitations at large U , and this BEC strong coupling regime is smoothly
+connected to the intermediate U excitonic insulator region. We solved the
+degenerate three-orbital Hubbard model with spin-orbit coupling ($\lambda$) in
+one-dimensional geometry using the Density Matrix Renormalization Group, while
+in two-dimensional square clusters we use the Hartree-Fock approximation (HFA).
+Employing these techniques, we provide the full $\lambda$ vs U phase diagrams
+for both one- and two- dimensional lattices. Our main result is that at the
+intermediate Hubbard U region of our focus, increasing $\lambda$ at fixed U the
+system transitions from an incommensurate spin-density-wave metal to a
+Bardeen-Cooper-Schrieffer (BCS) excitonic insulator, with coherence length r
+coh of O(a) and O(10a) in 1d and 2d, respectively, with a the lattice spacing.
+Further increasing $\lambda$, the system eventually crosses over to the BEC
+limit (with r coh << a).",2002.07351v1
+2020-04-29,Towards Electrical-Current Control of Quantum States in Spin-Orbit-Coupled Matter,"Novel materials, which often exhibit surprising or even revolutionary
+physical properties, are necessary for critical advances in technologies.
+Simultaneous control of structural and physical properties via a small
+electrical current is of great significance both fundamentally and
+technologically. Recent studies demonstrate that a combination of strong
+spin-orbit interactions and a distorted crystal structure in magnetic Mott
+insulators is sufficient to attain this long-desired goal. In this Topical
+Review, we highlight underlying properties of this class of materials and
+present two representative antiferromagnetic Mott insulators, namely,
+4d-electron based Ca2RuO4 and 5d-electron based Sr2IrO4, as model systems. In
+essence, a small, applied electrical current engages with the lattice,
+critically reducing structural distortions, which in turn readily suppresses
+the antiferromagnetic and insulating state and subsequently results in emergent
+new states. While details may vary in different materials, at the heart of
+these phenomena are current-reduced lattice distortions, which, via spin-orbit
+interactions, dictate physical properties. Electrical current, which joins
+magnetic field, electric field, pressure, light, etc. as a new external
+stimulus, provides a new, key dimension for materials research, and also pose a
+series of intriguing questions that may provide the impetus for advancing our
+understanding of spin-orbit-coupled matter. This Topical Review provides a
+brief introduction, a few hopefully informative examples and some general
+remarks. It is by no means an exhaustive report of the current state of studies
+on this topic.",2004.14510v2
+2017-09-29,CERES: An ab initio code dedicated to the calculation of the electronic structure and magnetic properties of lanthanide complexes,"We have developed and implemented a new ab initio code, CERES (Computational
+Emulator of Rare Earth Systems), completely written in C++11, which is
+dedicated to the efficient calculation of the electronic structure and magnetic
+properties of the crystal field states arising from the splitting of the ground
+state spin-orbit multiplet in lanthanide complexes. The new code gains
+efficiency via an optimised implementation of a direct configurational averaged
+Hartree-Fock (CAHF) algorithm for the determination of $4f$ quasi-atomic active
+orbitals common to all multi-electron spin manifolds contributing to the ground
+spin-orbit multiplet of the lanthanide ion. The new CAHF implementation is
+based on quasi-Newton convergence acceleration techniques coupled to an
+efficient library for the direct evaluation of molecular integrals, and
+problem-specific density matrix guess strategies. After describing the main
+features of the new code, we compare its efficiency with the current
+state--of--the--art ab initio strategy to determine crystal field levels and
+properties, and show that our methodology, as implemented in CERES, represents
+a more time-efficient computational strategy for the evaluation of the magnetic
+properties of lanthanide complexes, also allowing a full representation of
+non-perturbative spin-orbit coupling effects.",1709.10315v1
+2018-10-24,High-throughput Discovery of Topologically Non-trivial Materials using Spin-orbit Spillage,"We present a novel methodology to identify topologically non-trivial
+materials based on band inversion induced by spin-orbit coupling (SOC) effect.
+Specifically, we compare the density functional theory (DFT) based
+wavefunctions with and without spin-orbit coupling and compute the
+spin-orbit-spillage as a measure of band-inversion. Due to its ease of
+calculation, without any need for symmetry analysis or dense k-point
+interpolation, the spillage is an excellent tool for identifying topologically
+non-trivial materials. Out of 30000 materials available in the JARVIS-DFT
+database, we applied this methodology to more than 4835 non-magnetic materials
+consisting of heavy atoms and low bandgaps. We found 1868 candidate materials
+with high-spillage (using 0.5 as a threshold). We validated our methodology by
+carrying out conventional Wannier-interpolation calculations for 289 candidate
+materials. We demonstrate that in addition to Z2 topological insulators, this
+screening method successfully identified many semimetals and topological
+crystalline insulators. Importantly, our approach is applicable to the
+investigation of disordered or distorted as well as magnetic materials, because
+it is not based on symmetry considerations. We discuss some individual example
+materials, as well as trends throughout our dataset, which is available at the
+websites: https://www.ctcms.nist.gov/~knc6/JVASP.html and
+https://jarvis.nist.gov/.",1810.10640v2
+2001-11-08,Mesoscopics in Spintronics: Quantum Interference Effects in Spin-Polarized Electron Transport,"We generalize a Landauer-type formula, using a real$\otimes$spin-space Green
+function technique, to treat spin-dependent transport in quantum-coherent
+conductors attached to two ferromagnetic contacts. The formalism is employed to
+study the properties of components of an exact zero-temperature conductance
+matrix ${\bf G}$, as well as their mesoscopic fluctuations, describing
+injection and detection of a spin-polarized current in a two-dimensional system
+where electrons exhibit an interplay between Rashba spin-orbit (SO) coupling
+and phase-coherent propagation through a disordered medium. Strong Rashba
+coupling leads to a dramatic reduction of localization effects on the
+conductances and their fluctuations, whose features depend on the
+spin-polarization of injected electrons. In the limit of weak Rashba
+interaction antilocalization vanishes (i.e., the sum of the matrix elements of
+${\bf G}$ is almost independent of the SO coupling), but the partial
+spin-resolved conductances can still be non-zero. Besides spin-resolved
+conductance fluctuations and antilocalization, unusual quantum interference
+effects are revealed in this system leading to a negative difference between
+the partial conductances for a parallel and an antiparallel orientation of the
+contact magnetization, in a range of disorder strengths and for a particular
+spin-polarization of incoming electron with respect to the direction of Rashba
+electric field.",0111144v3
+2020-11-02,Spin precession as a new window into disformal scalar fields,"We launch a first investigation into how a light scalar field coupled both
+conformally and disformally to matter influences the evolution of spinning
+point-like bodies. Working directly at the level of the equations of motion, we
+derive novel spin-orbit and spin-spin effects accurate to leading order in a
+nonrelativistic and weak-field expansion. Crucially, unlike the
+spin-independent effects induced by the disformal coupling, which have been
+shown to vanish in circular binaries due to rotational symmetry, the
+spin-dependent effects we study here persist even in the limit of zero
+eccentricity, and so provide a new and qualitatively distinct way of probing
+these kinds of interactions. To illustrate their potential, we confront our
+predictions with spin-precession measurements from the Gravity Probe B
+experiment and find that the resulting constraint improves upon existing bounds
+from perihelion precession by over 5 orders of magnitude. Our results therefore
+establish spin effects as a promising window into the disformally coupled dark
+sector.",2011.01213v2
+2021-04-26,Hyperfine-mediated transitions between electronic spin-1/2 levels of transition metal defects in SiC,"Transition metal defects in SiC give rise to localized electronic states that
+can be optically addressed in the telecom range in an industrially mature
+semiconductor platform. This has led to intense scrutiny of the spin and
+optical properties of these defect centers. For spin-1/2 defects, a combination
+of the defect symmetry and the strong spin-orbit coupling may restrict the
+allowed spin transitions, giving rise to defect spins that are long lived, but
+hard to address via microwave spin manipulation. Here, we show via analytical
+and numerical results that the presence of a central nuclear spin can lead to a
+non-trivial mixing of electronic spin states, while preserving the defect
+symmetry. The interplay between a small applied magnetic field and hyperfine
+coupling opens up magnetic microwave transitions that are forbidden in the
+absence of hyperfine coupling, enabling efficient manipulation of the
+electronic spin. We also find that an electric microwave field parallel to the
+c-axis can be used to manipulate the electronic spin via modulation of the
+relative strength of the dipolar hyperfine term.",2104.12433v2
+2022-12-16,Spin excitations in the kagome-lattice metallic antiferromagnet Fe$_{0.89}$Co$_{0.11}$Sn,"Kagome-lattice materials have attracted tremendous interest due to the broad
+prospect for seeking superconductivity, quantum spin liquid states, and
+topological electronic structures. Among them, the transition-metal kagome
+lattices are high-profile objects for the combination of topological
+properties, rich magnetism, and multiple-orbital physics. Here we report an
+inelastic neutron scattering study on the spin dynamics of a kagome-lattice
+antiferromagnetic metal Fe$_{0.89}$Co$_{0.11}$Sn. Although the magnetic
+excitations can be observed up to $\sim$250 meV, well-defined spin waves are
+only identified below $\sim$90 meV and can be modeled using Heisenberg exchange
+with ferromagnetic in-plane nearest-neighbor coupling $J_1$, in-plane
+next-nearest-neighbor coupling $J_2$, and antiferromagnetic (AFM) interlayer
+coupling $J_c$ under linear spin-wave theory. Above $\sim$90 meV, the spin
+waves enter the itinerant Stoner continuum and become highly damped
+particle-hole excitations. At the K point of the Brillouin zone, we reveal a
+possible band crossing of the spin wave, which indicates a potential Dirac
+magnon. Our results uncover the evolution of the spin excitations from the
+planar AFM state to the axial AFM state in Fe$_{0.89}$Co$_{0.11}$Sn, solve the
+magnetic Hamiltonian for both states, and confirm the significant influence of
+the itinerant magnetism on the spin excitations.",2212.08590v2
+2005-09-01,Shot noise and spin-orbit coherent control of entangled and spin polarized electrons,"We extend our previous work on shot noise for entangled and spin polarized
+electrons in a beam-splitter geometry with spin-orbit (\textit{s-o})
+interaction in one of the incoming leads (lead 1). Besides accounting for both
+the Dresselhaus and the Rashba spin-orbit terms, we present general formulas
+for the shot noise of singlet and triplets states derived within the scattering
+approach. We determine the full scattering matrix of the system for the case of
+leads with \textit{two} orbital channels coupled via weak \textit{s-o}
+interactions inducing channel anticrossings. We show that this interband
+coupling coherently transfers electrons between the channels and gives rise to
+an additional modulation angle -- dependent on both the Rashba and Dresselhaus
+interaction strengths -- which allows for further independent coherent control
+of the electrons traversing the incoming leads. We derive explicit shot noise
+formulas for a variety of correlated pairs (e.g., Bell states) and lead spin
+polarizations. Interestingly, the singlet and \textit{each} of the triplets
+defined along the quantization axis perpendicular to lead 1 (with the local
+\textit{s-o} interaction) and in the plane of the beam splitter display
+distinctive shot noise for injection energies near the channel anticrossings;
+hence, one can tell apart all the triplets, in addition to the singlet, through
+noise measurements. We also find that spin-orbit induced backscattering within
+lead 1 reduces the visibility of the noise oscillations, due to the additional
+partition noise in this lead. Finally, we consider injection of two-particle
+wavepackets into leads with multiple discrete states and find that two-particle
+entanglement can still be observed via noise bunching and antibunching.",0509038v1
+2012-04-13,One-dimensional ballistic transport with FLAPW Wannier functions,"We present an implementation of the ballistic Landauer-B\""uttiker transport
+scheme in one-dimensional systems based on density functional theory (DFT)
+calculations within the full-potential linearized augmented plane-wave (FLAPW)
+method. In order to calculate the conductance within the Green's function
+method we map the electronic structure from the extended states of the FLAPW
+calculation to Wannier functions which constitute a minimal localized basis
+set. Our approach benefits from the high accuracy of the underlying FLAPW
+calculations allowing us to address the complex interplay of structure,
+magnetism, and spin-orbit coupling and is ideally suited to study
+spin-dependent electronic transport in one-dimensional magnetic nanostructures.
+To illustrate our approach we study ballistic electron transport in
+non-magnetic Pt monowires with a single stretched bond including spin-orbit
+coupling, and in ferromagnetic Co monowires with different collinear magnetic
+alignment of the electrodes with the purpose of analysing the magnetoresistance
+when going from tunneling to the contact regime. We further investigate
+spin-orbit scattering due to an impurity atom. We consider two configurations:
+a Co atom in a Pt monowire and vice versa. In both cases, the spin-orbit
+induced band mixing leads to a change of the conductance upon switching the
+magnetization direction from along the chain axis to perpendicular to it. The
+main contribution stems from ballistic spin-scattering for the magnetic Co
+impurity in the non-magnetic Pt monowire and for the Pt scatterer in the
+magnetic Co monowire from the band formed from states with $d_{xy}$ and
+$d_{x^2-y^2}$ orbital symmetry. We quantify this effect by calculating the
+ballistic anisotropic magnetoresistance which displays values up to as much as
+7% for ballistic spin-scattering and gigantic values of around 100% for the Pt
+impurity in the Co wire.",1204.3002v1
+2014-04-04,Toroidal order in metals without local inversion symmetry,"Toroidal order, given by a composite of electric and magnetic orders,
+manifests itself not only in the peculiar magnetism but also in anomalous
+transport and magnetoelectric effect. We report our theoretical results on the
+influence and stability of a toroidal order in metals on the basis of a
+microscopic model. We consider an effective single-band Hubbard-type model with
+a site-dependent antisymmetric spin-orbit coupling, which is derived from a
+four-band tight-binding model including the atomic spin-orbit coupling,
+off-site hybridizations between orbitals with different parities, and
+odd-parity crystalline electric field. For this single-band model on a layered
+honeycomb lattice, we investigate the electronic structure, magnetotransport,
+and magnetoelectric effect in the toroidal ordered state with a vortex-like
+magnetic structure. The ferroic order of the microscopic toroidal moments acts
+as an effective gauge field for electrons, which modulates the electronic band
+structure with a shift of the band bottom in the momentum space. In addition,
+the site-dependent antisymmetric spin-orbit coupling gives rise to highly
+anisotropic Hall responses. The most salient feature is two different types of
+magnetoelectric responses: one is a magnetic order with net toroidal
+magnetization induced by an electric current perpendicular to the planes, and
+the other is a uniform transverse magnetization induced by an electric current
+within the planes. We examine the ground state of the effective model by the
+mean-field approximation, and show that the toroidal order is stabilized by
+strong electron correlations at low electron density. We also discuss the
+temperature dependence of the magnetoelectric effects associated with
+spontaneous toroidal ordering. Implications to experiments are also presented.",1404.1156v1
+2016-11-14,Unusual nodal behaviors of the superconducting gap in the iron-based superconductor Ba(Fe$_{0.65}$Ru$_{0.35}$)$_2$As$_2$: Effects of spin-orbit coupling,"We have investigated the superconducting gap of optimally doped
+Ba(Fe$_{0.65}$Ru$_{0.35}$)$_2$As$_2$ by angle-resolved photoemission
+spectroscopy (APRES) using bulk-sensitive 7 eV laser and synchrotron radiation.
+It was found that the gap is isotropic in the $k_x$-$k_y$ plane both on the
+electron and hole Fermi surfaces (FSs). The gap magnitudes of two resolved hole
+FSs show similar $k_z$ dependences and decrease as $k_z$ approaches $\sim$
+2$\pi$/$c$ (i.e., around the Z point) unlike the other Fe-based superconductors
+reported so far, where the superconducting gap of only one hole FS shows a
+strong $k_z$ dependence. This unique gap structure can be understood in the
+scenario that the $d_{z^2}$ orbital character is mixed into both hole FSs due
+to the finite spin-orbit coupling between almost degenerate FSs and is
+reproduced by calculations within the random phase approximation including the
+spin-orbit coupling.",1611.04266v1
+2020-04-29,Magnetized particle motion around magnetized Schwarzschild-MOG black hole,"In this paper, we have presented the studies of the motion of magnetized
+particles and energetic processes around Schwarzschild black holes in modified
+gravity (MOG). The study of circular stable orbits shows that orbits of
+magnetized particles can not be stable for the values of magnetic coupling
+parameter $\beta \geq 1$. It was also shown that the range of stable circular
+orbits increases with the increase of both MOG and magnetic coupling
+parameters, while the effects of magnetic interaction stronger than the
+gravity. It was obtained that the increase of the MOG parameter causes the
+increase of center-of-mass energy collision of magnetized particles. Moreover,
+we have analyzed how to mimic the magnetic interaction with the spin of Kerr
+and Schwarzschild-MOG black holes. We have obtained that the magnetic coupling
+parameter can mimic the spin parameter $a \leq 0.15$ ($a \leq 0.28$) giving the
+same radius of innermost contour(co)-rotating orbits at the values of the
+parameter $\beta \in (-1,1)$ and the MOG parameter in the range $\alpha \in
+(-0.17,0.28)$ while the MOG parameter $\alpha \in (-0.7, 0.9)$ mimics spin
+parameter of the black hole with the range $|a| \in (0,1)$.",2004.14868v2
+2016-10-27,Model spin-orbit coupling Hamiltonians for graphene systems,"We present a detailed theoretical study of effective spin-orbit coupling
+(SOC) Hamiltonians for graphene based systems, covering global effects such as
+proximity to substrates and local SOC effects resulting, for example, from
+dilute adsorbate functionalization. Our approach combines group theory and
+tight-binding descriptions. We consider structures with global point group
+symmetries $D_{6h}$, $D_{3d}$, $D_{3h}$, $C_{6v}$, and $C_{3v}$ that represent,
+for example, pristine graphene, graphene mini-ripple, planar boron-nitride,
+graphene on a substrate and free standing graphone, respectively. The presence
+of certain spin-orbit coupling parameters is correlated with the absence of the
+specific point group symmetries. Especially in the case of $C_{6v}$---graphene
+on a substrate, or transverse electric field---we point out the presence of a
+third SOC parameter, besides the conventional intrinsic and Rashba
+contributions, thus far neglected in literature. For all global structures we
+provide effective SOC Hamiltonians both in the local atomic and Bloch forms.
+Dilute adsorbate coverage results in the local point group symmetries $C_{6v}$,
+$C_{3v}$, and $C_{2v}$ which represent the stable adsorption at hollow, top and
+bridge positions, respectively. For each configuration we provide effective SOC
+Hamiltonians in the atomic orbital basis that respect local symmetries. In
+addition to giving specific analytic expressions for model SOC Hamiltonians, we
+also present general (no-go) arguments about the absence of certain SOC terms.",1610.08794v1
+2023-12-29,Spin-orbit coupling tuned crossover of gaped and gapless topological phases in the chalcopyrite HgSnX 2 (X=N/P): An ab-initio investigation,"The coupling between electron orbital momentum and spin momentum, known as
+spin-orbit coupling (SOC), is a fundamental origin of a multitude of
+fascinating physical phenomena, especially it holds paramount significance in
+the realm of topological materials. In our work, we have predicted the
+topological phase in Hg-based chalcopyrite compounds using the first principles
+density functional theory. The initial focus was on HgSnN 2 , revealing it to
+be a nonmagnetic Weyl semimetal, while HgSnP 2 displayed characteristics of a
+strong topological insulator. What makes our work truly unique is that despite
+both compounds having the same SOC strength, arises from Hg, they exhibit
+distinct topological phases due to the distinct hybridization effect of the
+Hg-5d and X-p bands. This finding can address a significant factor, i.e., the
+effect of the band hybridization in deriving distinct topological phases,
+keeping the symmetry aspect intact. Our results indicate that due to the
+presence of band hybridization between the dominant X-np orbitals n=2 and 3 for
+X=N and P respectively and a minor contribution from Hg-5d, we can tune the
+topological phase by manipulating SOC strength, which equivalently achievable
+by chemical substitutions. This investigation stands as a remarkable
+illustration of the unique roles that hybridization plays in sculpting the
+topological properties of these compounds while simultaneously preserving their
+underlying symmetries.",2312.17669v1
+2024-02-23,Simulating Transient X-ray Photoelectron Spectra of Fe(CO)5 and Its Photodissociation Products With Multireference Algebraic Diagrammatic Construction Theory,"Accurate simulations of transient X-ray photoelectron spectra (XPS) provide
+unique opportunities to bridge the gap between theory and experiment in
+understanding the photoactivated dynamics in molecules and materials. However,
+simulating X-ray photoelectron spectra along a photochemical reaction pathway
+is challenging as it requires accurate description of electronic structure
+incorporating core-hole screening, orbital relaxation, electron correlation,
+and spin-orbit coupling in excited states or at nonequilibrium ground-state
+geometries. In this work, we employ the recently developed multireference
+algebraic diagrammatic construction theory (MR-ADC) to investigate the
+core-ionized states and X-ray photoelectron spectra of Fe(CO)5 and its
+photodissociation products (Fe(CO)4, Fe(CO)3) following excitation with 266 nm
+light. The simulated transient Fe 3p and CO 3{\sigma} XPS spectra incorporating
+spin-orbit coupling and high-order electron correlation effects are shown to be
+in a good agreement with the experimental measurements by Leitner et al. [J.
+Chem. Phys. 149, 044307 (2018)]. Our calculations suggest that core-hole
+screening, spin-orbit coupling, and ligand-field splitting effects are
+similarly important in reproducing the experimentally observed chemical shifts
+in transient Fe 3p XPS spectra of iron carbonyl complexes. Our results also
+demonstrate that the MR-ADC methods can be very useful in interpreting the
+transient XPS spectra of transition metal compounds.",2402.15599v1
+2023-07-28,Type II t-J model and shared antiferromagnetic spin coupling from Hund's rule in superconducting La$_3$Ni$_2$O$_7$,"Recently, a 80 K superconductor was discovered in La$_3$Ni$_2$O$_7$ under
+high pressure. Density function theory (DFT) calculations identify
+$d_{x^2-y^2}$, $d_{z^2}$ as the active orbitals on the bilayer square lattice
+with a $d^{8-x}$ configuration of of Ni per site. One naive expectation is to
+describe this system in terms of a two-orbital t-J model. However, we emphasize
+the importance of Hund's coupling $J_H$ and the $x=0$ limit should be viewed as
+a spin-one Mott insulator. Especially, the significant Hund's coupling shares
+the inter-layer super-exchange $J_\perp$ of the $d_{z^2}$ orbital to the
+$d_{x^2-y^2}$ orbital, an effect that cannot be captured by conventional
+perturbation or mean-field approaches. In this study, we first explore the
+limit where the $d_{z^2}$ orbital is Mott localized, dealing with a one-orbital
+bilayer t-J model focused on the $d_{x^2-y^2}$ orbital. Notably, we find that
+strong inter-layer pairing survives up to $x=0.5$ hole doping driven by the
+transmitted $J_\perp$, which explains the existence of a high Tc superconductor
+in the experiment at this doping level. Next, we uncover the more realistic
+situation where the $d_{z^2}$ orbital is slightly hole-doped and cannot be
+simply integrated out. We take the $J_H\rightarrow +\infty$ limit and propose a
+type II t-J model with four \textit{spin-half} singlon ($d^7$) states and three
+\textit{spin-one} doublon ($d^8$) states. Employing a parton mean-field
+approach, we recover similar results as in the one-orbital t-J model, but now
+with the effect of the $J_\perp$ automatically generated. We propose future
+experiments to electron dope the system to further enhance $T_c$.",2307.15706v3
+2020-09-28,Effective Field Theory of Dark Matter Direct Detection With Collective Excitations,"We develop a framework for computing light dark matter direct detection rates
+through single phonon and magnon excitations via general effective operators.
+Our work generalizes previous calculations focused on spin-independent
+interactions involving the total nucleon and electron numbers $N$ (the usual
+route to excite phonons) and spin-dependent interactions involving the total
+electron spin $S$ (the usual route to excite magnons), leading us to identify
+new responses involving the orbital angular momenta $L$, as well as spin-orbit
+couplings $L\otimes S$ in the target. All four types of responses can excite
+phonons, while couplings to electron's $S$ and $L$ can also excite magnons. We
+apply the effective field theory approach to a set of well-motivated
+relativistic benchmark models, including (pseudo-)scalar mediated interactions,
+and models where dark matter interacts via a multipole moment, such as a dark
+electric dipole, magnetic dipole or anapole moment. We find that couplings to
+point-like degrees of freedom $N$ and $S$ often dominate dark matter detection
+rates, implying that exotic materials with orbital $L$ order or large
+spin-orbit couplings $L\otimes S$ are not necessary to have strong reach to a
+broad class of DM models. We highlight that phonon based crystal experiments in
+active R&D (such as SPICE) will probe light dark matter models well beyond
+those having a simple spin-independent interaction, including e.g. models with
+dipole and anapole interactions. Lastly, we make publicly available a code,
+PhonoDark, which computes single phonon production rates in a wide variety of
+materials with the effective field theory framework.",2009.13534v2
+2021-10-19,Electronic reconstruction and charge transfer in strained Sr$_2$CoIrO$_6$ double perovskite,"The electronic, magnetic and optical properties of the double perovskite
+Sr$_2$CoIrO$_6$ (SCIO) under biaxial strain are explored in the framework of
+density functional theory (DFT) including a Hubbard $U$ term and spin-orbit
+coupling (SOC) in combination with absorption spectroscopy measurements on
+epitaxial thin films. While the end member SrIrO$_3$ is a semimetal with a
+quenched spin and orbital moment and bulk SrCoO$_3$ is a ferromagnetic (FM)
+metal with spin and orbital moment of 2.50 and 0.13 $\mu_{B}$, respectively,
+the double perovskite SCIO emerges as an antiferromagnetic Mott insulator with
+antiparallel alignment of Co, Ir planes along the [110]-direction. Co exhibits
+a spin and enhanced orbital moment of $\sim 2.35-2.45$ and $0.31-$0.45
+$\mu_{B}$, respectively. Most remarkably, Ir acquires a significant spin and
+orbital moment of 1.21-1.25 and 0.13 $\mu_{B}$, respectively. Analysis of the
+orbital occupation indicates an electronic reconstruction due to a substantial
+charge transfer from minority to majority spin states in Ir and from Ir to Co,
+signaling an Ir$^{4+\delta}$, Co$^{4-\delta}$ configuration. Biaxial strain,
+varied from -1.02% ($a_{\rm NdGaO_3}$) through 0% ($a_{\rm SrTiO_3}$) to 1.53%
+($a_{\rm GdScO_3}$), influences in partcular the orbital polarization of the
+$t_{2g}$ states and leads to a nonmonotonic change of the band gap between 163
+and 235 meV. The absorption coefficient reveals a two plateau fearure due to
+transitions from the valence to the lower lying narrow $t_{2g}$ and the higher
+lying broader $e_{g}$ bands. Inclusion of many body effects, in particular,
+excitonic effects by solving the Bethe-Salpeter equation (BSE), increases the
+band gap by $\sim0.2$ and improves the agreement with the measured spectrum
+concerning the position of the second peak at $\sim 2.6$ eV.",2110.09810v1
+2004-08-31,Mesoscopic Spin Hall Effect in Multiprobe Ballistic Spin-Orbit Coupled Semiconductor Bridges,"We predict that unpolarized charge current driven through the longitudinal
+leads attached to ballistic quantum-coherent two-dimensional electron gas
+(2DEG) in semiconductor heterostructure will induce a {\em pure} spin current,
+which is not accompanied by any net charge flow, in the transverse voltage
+probes. Its magnitude can be tuned by the Rashba spin-orbit (SO) interaction
+and, moreover, it is resilient to weak spin-independent scattering off
+impurities within the metallic diffusive regime. While the polarization vector
+of the spin transported through the transverse leads is not orthogonal to the
+plane of 2DEG, we demonstrate that only two components (out-of-plane and
+longitudinal) of the transverse spin current are signatures of the spin Hall
+effect in four-probe Rashba spin-split semiconductor nanostructures. The linear
+response spin Hall current, obtained from the multiprobe Landauer-B\"" uttiker
+scattering formalism generalized for quantum transport of spin, is the
+Fermi-surface determined nonequilibrium quantity whose scaling with the 2DEG
+size $L$ reveals the importance of processes occurring on the spin precession
+{\em mesoscale} $L_{\rm SO}$ (on which spin precesses by an angle $\pi$)--the
+out-of-plane component of the transverse spin current exhibits quasioscillatory
+behavior for $L \lesssim L_{\rm SO}$ (attaining the maximum value in 2DEGs of
+the size $L_{\rm SO} \times L_{\rm SO}$), while it reaches the asymptotic value
+in the macroscopic regime $L \gg L_{\rm SO}$. Furthermore, these values of the
+spin Hall current can be manipulated by the measuring geometry defined by the
+attached leads.",0408693v5
+2021-09-08,Spin-orbit induced equilibrium spin currents in materials,"The existence of spin-currents in absence of any driving external fields is
+commonly considered an exotic phenomenon appearing only in quantum materials,
+such as topological insulators. We demonstrate instead that equilibrium spin
+currents are a rather general property of materials with non negligible
+spin-orbit coupling (SOC). Equilibrium spin currents can be present at the
+surfaces of a slab. Yet, we also propose the existence of global equilibrium
+spin currents, which are net bulk spin-currents along specific crystallographic
+directions of materials. Equilibrium spin currents are allowed by symmetry in a
+very broad class of systems having gyrotropic point groups. The physics behind
+equilibrium spin currents is uncovered by making an analogy between electronic
+systems with SOC and non-Abelian gauge theories. The electron spin can be seen
+as the analogous of the color degree of freedom and equilibrium spin currents
+can then be identified with diamagnetic color currents appearing as the
+response to an effective non-Abelian magnetic field generated by SOC.
+Equilibrium spin currents are not associated with spin transport and
+accumulation, but they should nonetheless be carefully taken into account when
+computing transport spin currents. We provide quantitative estimates of
+equilibrium spin currents for several systems, specifically metallic surfaces
+presenting Rashba-like surface states, nitride semiconducting nanostructures
+and bulk materials, such as the prototypical gyrotropic medium tellurium. In
+doing so, we also point out the limitations of model approaches showing that
+first-principles calculations are needed to obtain reliable predictions. We
+therefore use Density Functional Theory computing the so-called bond currents,
+which represent a powerful tool to understand the relation between equilibrium
+currents, electronic structure and crystal point group.",2109.03790v2
+2014-07-25,"Strong-field tidal distortions of rotating black holes: Formalism and results for circular, equatorial orbits","Tidal coupling between members of a compact binary system can have an
+interesting and important influence on that binary's dynamical inspiral. Tidal
+coupling also distorts the binary's members, changing them (at lowest order)
+from spheres to ellipsoids. At least in the limit of fluid bodies and Newtonian
+gravity, there are simple connections between the geometry of the distorted
+ellipsoid and the impact of tides on the orbit's evolution. In this paper, we
+develop tools for investigating tidal distortions of rapidly rotating black
+holes using techniques that are good for strong-field, fast-motion binary
+orbits. We use black hole perturbation theory, so our results assume extreme
+mass ratios. We develop tools to compute the distortion to a black hole's
+curvature for any spin parameter, and for tidal fields arising from any bound
+orbit, in the frequency domain. We also develop tools to visualize the
+horizon's distortion for black hole spin $a/M \le \sqrt{3}/2$ (leaving the more
+complicated $a/M > \sqrt{3}/2$ case to a future analysis). We then study how a
+Kerr black hole's event horizon is distorted by a small body in a circular,
+equatorial orbit. We find that the connection between the geometry of tidal
+distortion and the orbit's evolution is not as simple as in the Newtonian
+limit.",1407.6983v3
+2011-02-10,An effective quantum parameter for strongly correlated metallic ferromagnets,"The correlated motion of electrons in multi-orbital metallic ferromagnets is
+investigated in terms of a realistic Hubbard model with {\cal N}-fold orbital
+degeneracy and arbitrary intra- and inter-orbital Coulomb interactions U and J
+using a Goldstone-mode-preserving non-perturbative scheme. An effective quantum
+parameter '\hbar'=\frac{U^2+({\cal N}-1)J^2}{(U+({\cal N}-1)J)^2} is obtained
+which determines, in analogy with 1/S for quantum spin systems and 1/N for the
+N-orbital Hubbard model, the strength of correlation-induced quantum
+corrections to magnetic excitations. The rapid suppression of this quantum
+parameter with Hund's coupling J, especially for large {\cal N}, provides
+fundamental insight into the phenomenon of strong stabilization of metallic
+ferromagnetism by orbital degeneracy and Hund's coupling. This approach is
+illustrated for the case of ferromagnetic iron and the half metallic Heusler
+alloy Co_2 Mn Si. For realistic values for iron, the calculated spin stiffness
+and Curie temperature values obtained are in quantitative agreement with
+measurements. Significantly, the contribution of long wavelength modes is shown
+to yield a nearly ~25% reduction in the calculated Curie temperature. Finally,
+an outline is presented for extending the approach to generic multi-band
+metallic ferromagnets including realistic band-structure features of
+non-degenerate orbitals and inter-orbital hopping as obtained from LDA
+calculations.",1102.2115v1
+2018-05-31,Investigation into the role of the orbital moment in a series of isostructural weak ferromagnets,"The orbital contribution to the magnetic moment of the transition metal ion
+in the isostructural weak ferromagnets ACO$_3$ (A=Mn,Co,Ni) and FeBO$_3$ was
+investigated by a combination of first-principles calculations, non-resonant
+x-ray magnetic scattering and x-ray magnetic circular dichroism. A non-trivial
+evolution of the orbital moment as a function of the $3d$ orbitals filling is
+revealed, with an anomalously large value found in the Co member of the family.
+Here, the coupling between magnetic and lattice degrees of freedom produced by
+the spin-orbit interaction results in a large single-ion anisotropy and a
+peculiar magnetic-moment-induced electron cloud distortion, evidenced by the
+appearance of a subtle scattering amplitude at space group-forbidden
+reflections and significant magnetostrictive effects. Our results, which
+complement a previous investigation on the sign of the Dzyaloshinskii$-$Moriya
+interaction across the series, highlight the importance of spin-orbit coupling
+in the physics of weak ferromagnets and prove the ability of modern
+first-principles calculations to predict the properties of materials where the
+Dzyaloshinskii$-$Moriya interaction is a fundamental ingredient of the magnetic
+Hamiltonian.",1805.12423v2
+2019-04-16,Engineering spin squeezing in a 3D optical lattice with interacting spin-orbit-coupled fermions,"One of the most important tasks in modern quantum science is to coherently
+control and entangle many-body systems, and to subsequently use these systems
+to realize powerful quantum technologies such as quantum-enhanced sensors.
+However, many-body entangled states are difficult to prepare and preserve since
+internal dynamics and external noise rapidly degrade any useful entanglement.
+Here, we introduce a protocol that counterintuitively exploits inhomogeneities,
+a typical source of dephasing in a many-body system, in combination with
+interactions to generate metrologically useful and robust many-body entangled
+states. Motivated by current limitations in state-of-the-art three-dimensional
+(3D) optical lattice clocks (OLCs) operating at quantum degeneracy, we use
+local interactions in a Hubbard model with spin-orbit coupling to achieve a
+spin-locking effect. In addition to prolonging inter-particle spin coherence,
+spin-locking transforms the dephasing effect of spin-orbit coupling into a
+collective spin-squeezing process that can be further enhanced by applying a
+modulated drive. Our protocol is fully compatible with state-of-the-art 3D OLC
+interrogation schemes and may be used to improve their sensitivity, which is
+currently limited by the intrinsic quantum noise of independent atoms. We
+demonstrate that even with realistic experimental imperfections, our protocol
+may generate $\sim10$--$14$ dB of spin squeezing in $\sim1$ second with
+$\sim10^2$--$10^4$ atoms. This capability allows OLCs to enter a new era of
+quantum enhanced sensing using correlated quantum states of driven
+non-equilibrium systems.",1904.07866v2
+2020-06-19,"Spin-orbit-proximitized ferromagnetic metal by monolayer transition metal dichalcogenide: Atlas of spectral functions, spin textures and spin-orbit torques in Co/MoSe$_2$, Co/WSe$_2$ and Co/TaSe$_2$ heterostructures","The bilayer heterostructures composed of an ultrathin ferromagnetic metal
+(FM) and a material hosting strong spin-orbit (SO) coupling are principal
+resource for SO torque and spin-to-charge conversion nonequilibrium effects in
+spintronics. We demonstrate how hybridization of wavefunctions of Co layer and
+a monolayer of transition metal dichalcogenides (TMDs)---such as semiconducting
+MoSe$_2$ and WSe$_2$ or metallic TaSe$_2$---can lead to dramatic transmutation
+of electronic and spin structure of Co within some distance away from its
+interface with TMD, when compared to the bulk of Co or its surface in contact
+with vacuum. This is due to proximity induced SO splitting of Co bands encoded
+in the spectral functions and spin textures on its monolayers, which we obtain
+using noncollinear density functional theory (ncDFT) combined with equilibrium
+Green function (GF) calculations. In fact, SO splitting is present due to
+structural inversion asymmetry of the bilayer even if SO coupling within TMD
+monolayer is artificially switched off in ncDFT calculations, but switching it
+on makes the effects associated with proximity SO coupling within Co layer
+about five times larger. Injecting spin-unpolarized charge current through
+SO-proximitized monolayers of Co generates nonequilibrium spin density over
+them, so that its cross product with the magnetization of Co determines SO
+torque. The SO torque computed via first-principles quantum transport
+methodology, which combines ncDFT with nonequilibrium GF calculations, can be
+used as the screening parameter to identify optimal combination of materials
+and their interfaces for applications in spintronics. In particular, we
+identify heterostructure two-monolayer-Co/monolayer-WSe$_2$ as the most
+optimal.",2006.11335v1
+2021-04-15,Interacting holes in Si and Ge double quantum dots: from a multiband approach to an effective-spin picture,"The states of two electrons in tunnel-coupled semiconductor quantum dots can
+be effectively described in terms of a two-spin Hamiltonian with an isotropic
+Heisenberg interaction. A similar description needs to be generalized in the
+case of holes due to their multiband character and spin-orbit coupling, which
+mixes orbital and spin degrees of freedom, and splits $J=3/2$ and $J = 1/2$
+multiplets. Here we investigate two-hole states in prototypical coupled Si and
+Ge quantum dots via different theoretical approaches. Multiband
+$\boldsymbol{k}\cdot\boldsymbol{p}$ and Configuration-Interaction calculations
+are combined with entanglement measures in order to thoroughly characterize the
+two-hole states in terms of band mixing and justify the introduction of an
+effective spin representation, which we analytically derive a from generalized
+Hubbard model. We find that, in the weak interdot regime, the ground state and
+first excited multiplet of the two-hole system display -- unlike their
+electronic counterparts -- a high degree of $J$-mixing, even in the limit of
+purely heavy-hole states. The light-hole component additionally induces
+$M$-mixing and a weak coupling between spinors characterized by different
+permutational symmetries.",2104.07730v2
+2008-06-20,Effective Hamiltonian for FeAs based superconductors,"The recently discovered FeAs-based superconductors show intriguing behavior
+and unusual dynamics of electrons and holes which occupy the Fe $d$-orbitals
+and As $4s$ and $4p$ orbitals. Starting from the atomic limit, we carry out a
+strong coupling expansion to derive an effective hamiltonian that describes the
+electron and hole behavior. The hopping and the hybridization parameters
+between the Fe $d$ and As $s$ and $p$-orbitals are obtained by fitting the
+results of our density-functional-theory calculations to a tight-binding model
+with nearest-neighbor interactions and a minimal orbital basis. We find that
+the effective hamiltonian, in the strong on-site Coulomb repulsion limit,
+operates on three distinct sub-spaces coupled through Hund's rule. The three
+sub-spaces describe different components (or subsystems): (a) one spanned by
+the $d_{x^2-y^2}$ Fe orbital; (b) one spanned by the degenerate atomic Fe
+orbitals $d_{xz}$ and $d_{yz}$; and (c) one spanned by the atomic Fe orbitals
+$d_{xy}$ and $d_{z^2}$. Each of these Hamiltonians is an extended t-t'-J-J'
+model and is characterized by different coupling constants and filling factors.
+For the case of the undoped material the second subspace alone prefers a ground
+state characterized by a spin-density-wave order similar to that observed in
+recent experimental studies, while the other two subspaces prefer an
+antiferromagnetic order. We argue that the observed spin-density-wave order
+minimizes the ground state energy of the total hamiltonian.",0806.3432v5
+2012-09-02,Tensor-optimized shell model for the Li isotopes with a bare nucleon-nucleon interaction,"We study the Li isotopes systematically in terms of the tensor-optimized
+shell model (TOSM) by using a bare nucleon-nucleon interaction as the AV8'
+interaction. The short-range correlation is treated in the unitary correlation
+operator method (UCOM). Using the TOSM+UCOM approach, we investigate the role
+of the tensor force on each spectrum of the Li isotopes. It is found that the
+tensor force produces quite a characteristic effect on various states in each
+spectrum and those spectra are affected considerably by the tensor force. The
+energy difference between the spin-orbit partner, the p1/2 and p3/2 orbits of
+the last neutron, in 5Li is caused by opposite roles of the tensor correlation.
+In 6Li, the spin-triplet state in the LS coupling configuration is favored
+energetically by the tensor force in comparison with jj coupling shell model
+states. In 7,8,9Li, the low-lying states containing extra neutrons in the p3/2
+orbit are favored energetically due to the large tensor contribution to allow
+the excitation from the 0s orbit to the p1/2 orbit by the tensor force. Those
+three nuclei show the jj coupling character in their ground states which is
+different from 6Li.",1209.0150v1
+2005-04-07,"Coriolis force, geometric phase, and spin-electric coupling in semiconductors","We consider the response of an effective spin of a charge carrier to an
+adiabatic rotation of its crystal momentum induced by electric field. This
+rotation gives rise to Coriolis pseudo-force that is responsible for torque
+acting on the orbital momentum of a particle. Mediated by a spin-orbit coupling
+in the valence band this perturbation leads to a spin-electric coupling that
+may affect the coherent transport properties of a charge carrier and cause a
+spin precession in zero magnetic fields. In the static uniform electric field
+the derived effective spin-Hamiltonians of the carriers in the conduction and
+light hole bands are homologous to the Rashba Hamiltonian. These effects may be
+also interpreted as a manifestation of, in general, a non-Abelian gauge
+potential and can be described in purely geometric terms as a consequence of
+the corresponding holonomy. We demonstrate that in the conduction band the
+strength of the associated covariant gauge field is proportional to the
+effective electron g-tensor and is controllable by gate fields or a strain
+applied to the crystal.",0504183v6
+2016-05-17,Spin-lattice coupling mediated multiferroicity in (ND4)2FeCl5D2O,"We report a neutron diffraction study of the multiferroic mechanism in
+(ND4)2FeCl5D2O, a molecular compound that exhibits magnetically induced
+ferroelectricity. This material exhibits two successive magnetic transitions on
+cooling: a long-range order transition to an incommensurate (IC) collinear
+sinusoidal spin state at TN=7.3 K, followed by a second transition to an IC
+cycloidal spin state at TFE=6.8 K, the later of which is accompanied by
+spontaneous ferroelectric polarization. The cycloid structure is strongly
+distorted by spin-lattice coupling as evidenced by the observations of both odd
+and even higher-order harmonics associated with the cycloid wave vector, and a
+weak commensurate phase that coexists with the IC phase. The appearance of the
+2nd-order harmonic coincides with the onset of the electric polarization,
+thereby providing unambiguous evidence that the induced electric polarization
+is mediated by the spin-lattice interaction. Our results for this system, in
+which the orbital angular momentum is expected to be quenched, are remarkably
+similar to those of the prototypical TbMnO3, in which the magnetoelectric
+effect is attributed to spin-orbit coupling.",1605.05214v1
+2019-10-17,Scattering-induced and highly tunable by gate damping-like spin-orbit torque in graphene doubly proximitized by two-dimensional magnet Cr$_2$Ge$_2$Te$_6$ and WS$_2$,"Graphene sandwiched between semiconducting monolayers of ferromagnet
+Cr$_2$Ge$_2$Te$_6$ and transition-metal dichalcogenide WS$_2$ acquires both
+spin-orbit (SO), of valley-Zeeman and Rashba types, and exchange couplings.
+Using first-principles combined with quantum transport calculations, we predict
+that such doubly proximitized graphene within van der Waals heterostructure
+will exhibit SO torque driven by unpolarized charge current. This system
+lacking spin Hall current, putatively considered to be necessary for efficient
+damping-like (DL) SO torque that plays a key role in magnetization switching,
+demonstrates how DL torque component can be generated solely by skew-scattering
+off spin-independent potential barrier or impurities in purely two-dimensional
+electronic transport due to the presence of proximity SO coupling and its spin
+texture tilted out-of-plane. This leads to current-driven nonequilibrium spin
+density emerging in all spatial directions, whose cross product with proximity
+magnetization yields DL SO torque, unlike the ballistic regime with no
+scatterers in which only field-like (FL) SO torque appears. In contrast to SO
+torque on conventional metallic ferromagnets in contact with three dimensional
+SO-coupled materials, the ratio of FL and DL torque can be tuned by more than
+an order of magnitude via combined top and back gates.",1910.08072v3
+2006-10-25,Ballistic spin field-effect transistors: Multichannel effects,"We study a ballistic spin field-effect transistor (SFET) with special
+attention to the issue of multi-channel effects. The conductance modulation of
+the SFET as a function of the Rashba spin-orbit coupling strength is
+numerically examined for the number of channels ranging from a few to close to
+100. Even with the ideal spin injector and collector, the conductance
+modulation ratio, defined as the ratio between the maximum and minimum
+conductances, decays rapidly and approaches one with the increase of the
+channel number. It turns out that the decay is considerably faster when the
+Rashba spin-orbit coupling is larger. Effects of the electronic coherence are
+also examined in the multi-channel regime and it is found that the coherent
+Fabry-Perot-like interference in the multi-channel regime gives rise to a
+nested peak structure. For a nonideal spin injector/collector structure, which
+consists of a conventional metallic ferromagnet-thin insulator-2DEG
+heterostructure, the Rashba-coupling-induced conductance modulation is strongly
+affected by large resonance peaks that arise from the electron confinement
+effect of the insulators. Finally scattering effects are briefly addressed and
+it is found that in the weakly diffusive regime, the positions of the resonance
+peaks fluctuate, making the conductance modulation signal sample-dependent.",0610685v2
+2007-12-28,"Half Semimetallic Antiferromagnetism in the Sr$_2$CrTO$_6$ System, T=Os, Ru","Double perovskite Sr$_2$CrOsO$_6$ is (or is very close to) a realization of a
+spin-asymmetric semimetallic compensated ferrimagnet, according to first
+principles calculations. This type of near-half metallic antiferromagnet is an
+unusual occurrence, and more so in this compound because the zero gap is
+accidental rather than being symmetry determined. The large spin-orbit coupling
+(SOC) of osmium upsets the spin balance (no net spin moment without SOC): it
+reduces the Os spin moment by 0.27 $\mu_B$ and induces an Os orbital moment of
+0.17 $\mu_B$ in the opposite direction. The effects combine (with small oxygen
+contributions) to give a net total moment of 0.54 $\mu_B$ per cell in \scoo,
+reflecting a large impact of SOC in this compound. This value is in moderately
+good agreement with the measured saturation moment of 0.75 $\mu_B$. The value
+of the net moment on the Os ion obtained from neutron diffraction (0.73 $\mu_B$
+at low temperature) differs from the calculated value (1.14 $\mu_B$). Rather
+surprisingly, in isovalent Sr$_2$CrRuO$_6$ the smaller SOC-induced spin changes
+and orbital moments (mostly on Ru) almost exactly cancel. This makes
+Sr$_2$CrRuO$_6$ a ""half (semi)metallic antiferromagnet"" (practically vanishing
+net total moment) even when SOC is included, with the metallic channel being a
+small-band-overlap semimetal. Fixed spin moment (FSM) calculations are
+presented for each compound, illustrating how they provide different
+information than in the case of a nonmagnetic material. These FSM results
+indicate that the Cr moment is an order of magnitude stiffer against
+longitudinal fluctuations than is the Os moment.",0712.4308v1
+2017-08-08,Spin-orbit-torque driven magnetoimpedance in Pt-layer/magnetic-ribbon heterostructures,"When a flow of electron passes through a paramagnetic layer with strong
+spin-orbit-coupling such as platinum (Pt), a net spin current is produced via
+spin Hall effect (SHE). This spin current can exert a torque on the
+magnetization of an adjacent ferromagnetic layer which can be probed via
+magnetization dynamic response, e.g. spin-torque ferromagnetic resonance
+(ST-FMR). Nevertheless, that effect in lower frequency magnetization dynamic
+regime (MHz) where skin effect occurs in high permeability ferromagnetic
+conductors namely the magneto-impedance (MI) effect can be fundamentally
+important which has not been studied so far. Here, by utilizing the MI effect
+in magnetic-ribbon/Pt heterostructure with high magnetic permeability that
+allows the ac current effectively confined at the skin depth of ~100 nm
+thickness, the effect of spin-orbit-torque (SOT) induced by the SHE probed via
+MI measurement is investigated. We observed a systematic MI frequency shift
+that increases by increasing the applied current amplitude and thickness of the
+Pt layer (varying from 0 nm to 20 nm). In addition, the role of Pt layer in
+ribbon/Pt heterostructure is evaluated with ferromagnetic resonance (FMR)
+effect representing standard Gilbert damping increase as the result of presence
+of the SHE. Our results unveil the role of SOT in dynamic control of the
+transverse magnetic permeability probed with impedance spectroscopy as useful
+and valuable technique for detection of future SHE devices.",1708.02402v2
+2017-04-11,Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe$_{2}$As$_{2}$,"The iron-based high temperature superconductors exhibit a rich phase diagram
+reflecting a complex interplay between spin, lattice, and orbital degrees of
+freedom [1-4]. The nematic state observed in many of these compounds epitomizes
+this complexity, by entangling a real-space anisotropy in the spin fluctuation
+spectrum with ferro-orbital order and an orthorhombic lattice distortion [5-7].
+A more subtle and much less explored facet of the interplay between these
+degrees of freedom arises from the sizable spin-orbit coupling present in these
+systems, which translates anisotropies in real space into anisotropies in spin
+space. Here, we present a new technique enabling nuclear magnetic resonance
+under precise tunable strain control, which reveals that upon application of a
+tetragonal symmetry-breaking strain field, the magnetic fluctuation spectrum in
+the paramagnetic phase of BaFe$_{2}$As$_{2}$ also acquires an anisotropic
+response in spin-space. Our results unveil a hitherto uncharted internal spin
+structure of the nematic order parameter, indicating that similar to liquid
+crystals, electronic nematic materials may offer a novel route to
+magneto-mechanical control.",1704.03566v1
+2020-10-04,Unified Framework for Charge-Spin Interconversion in Spin-Orbit Materials,"Materials with spin-orbit coupling are of great interest for various
+spintronics applications due to the efficient electrical generation and
+detection of spin-polarized electrons. Over the past decade, many materials
+have been studied, including topological insulators, transition metals, Kondo
+insulators, semimetals, semiconductors, and oxides; however, there is no
+unifying physical framework for understanding the physics and therefore
+designing a material system and devices with the desired properties. We present
+a model that binds together the experimental data observed on the wide variety
+of materials in a unified manner. We show that in a material with a given
+spin-momentum locking, the density of states plays a crucial role in
+determining the charge-spin interconversion efficiency, and a simple inverse
+relationship can be obtained. Remarkably, experimental data obtained over the
+last decade on many different materials closely follow such an inverse
+relationship. We further deduce two figure-of-merits of great current interest:
+the spin-orbit torque (SOT) efficiency (for the direct effect) and the inverse
+Rashba-Edelstein effect length (for the inverse effect), which statistically
+show good agreement with the existing experimental data on wide varieties of
+materials. Especially, we identify a scaling law for the SOT efficiency with
+respect to the carrier concentration in the sample, which agrees with existing
+data. Such an agreement is intriguing since our transport model includes only
+Fermi surface contributions and fundamentally different from the conventional
+views of the SOT efficiency that includes contributions from all the occupied
+states.",2010.01484v2
+2022-02-15,Cooperative effect of electrons spin polarization in a hybrid nanostructure of a magnetic thin film with adsorbed chiral molecules studied with non-spin-polarized scanning tunneling microscopy,"Polyalanine molecules (PA) with an {\alpha}-helix conformation gathered
+recently a lot of interest as the propagation of electrons through the chiral
+backbone structure comes along with spin polarization of the transmitted
+electrons. By means of scanning tunneling microscopy and spectroscopy at
+ambient conditions, PA molecules adsorbed on surfaces of epitaxial magnetic
+Al2O3/Pt/Au/Co/Au nanostructures with perpendicular anisotropy were studied.
+Thereby, a correlation between the PA molecules ordering at the surface with
+the electron tunneling across this hybrid system as a function of the substrate
+magnetization orientation as well as the coverage density and helicity of the
+was observed. The highest spin polarization values, P, were found for
+well-ordered self-assembled monolayers and with a defined chemical coupling of
+the molecules to the magnetic substrate surface, showing that the current
+induced spin selectivity is a cooperative effect. Thereby, P deduced from the
+electron transmission along unoccupied molecular orbitals of the helical
+molecules is larger as compared to values derived from the occupied molecular
+orbitals. Apparently, the larger orbital overlap is resulting in a higher
+electron mobility yielding a higher P value. By switching the magnetization
+direction of the Co-layer, it was demonstrated that the non-spin-polarized STM
+can be used to study chiral molecules with a sub-molecular resolution, to
+detect properties of buried magnetic layers and to detect the spin polarization
+of the molecules from the change of the magnetoresistance of such hybrid
+structures.",2202.07417v1
+2023-06-15,Wegner's Ising gauge spins versus Kitaev's Majorana partons: Mapping and application to anisotropic confinement in spin-orbital liquids,"Emergent gauge theories take a prominent role in the description of quantum
+matter, supporting deconfined phases with topological order and fractionalized
+excitations. A common construction of $\mathbb{Z}_2$ lattice gauge theories,
+first introduced by Wegner, involves Ising gauge spins placed on links and
+subject to a discrete $\mathbb{Z}_2$ Gauss law constraint. As shown by Kitaev,
+$\mathbb{Z}_2$ lattice gauge theories also emerge in the exact solution of
+certain spin systems with bond-dependent interactions. In this context, the
+$\mathbb{Z}_2$ gauge field is constructed from Majorana fermions, with gauge
+constraints given by the parity of Majorana fermions on each site. In this
+work, we provide an explicit Jordan-Wigner transformation that maps between
+these two formulations on the square lattice, where the Kitaev-type gauge
+theory emerges as the exact solution of a spin-orbital (Kugel-Khomskii)
+Hamiltonian. We then apply our mapping to study local perturbations to the
+spin-orbital Hamiltonian, which correspond to anisotropic interactions between
+electric-field variables in the $\mathbb{Z}_2$ gauge theory. These are shown to
+induce anisotropic confinement that is characterized by emergence of
+weakly-coupled one-dimensional spin chains. We study the nature of these phases
+and corresponding confinement transitions in both absence and presence of
+itinerant fermionic matter degrees of freedom. Finally, we discuss how our
+mapping can be applied to the Kitaev spin-1/2 model on the honeycomb lattice.",2306.09405v2
+2023-12-21,Electric dipole spin resonance in single and two electron quantum dot defined in two-dimensional electron gas at the SrTiO$_3$/LaAlO$_3$ interface,"We investigate the energy spectrum of a single and two electron quantum dot
+(QD) embedded in two dimensional electron gas at the interface between
+SrTiO$_3$ and LaAlO$_3$, in the presence of the external magnetic field. For
+this purpose the three band model of $3d$-electrons defined on the square
+lattice of Ti ions was utilized. We demonstrate that, for the weak parabolic
+confinement potential, the low energy spectrum is sufficiently well described
+by the effective Hamiltonian reduced to the one $d_{xy}$ orbital with the
+spin-orbit interaction originating from the coupling to the $d_{xz}$, $d_{yz}$
+bands. This is not the case for stronger confinement where contribution of the
+states related to the $d_{xz/yz}$ orbital is relevant. Based on the time
+depended calculations we discuss in details the manipulation of the electron
+spin in QD by external AC voltages, in the context of the electric dipole spin
+resonance. The allowed and forbidden transitions are discussed in details with
+respect to the parity selection rule. Our calculations show that for a single
+electron QD the spin-flip in the ground-state has a character of a Rabi
+resonance while for two electrons the singlet-triplet transition is forbidden
+by the parity symmetry. For the two electrons QD, we demonstrate that the
+spin-flip transition can still be accomplished via a second-order, two-photon
+process that has a two-state Rabi character for low AC field amplitude. The
+violation of the parity symmetry on the spin-flip transitions is also analyzed.",2312.13862v1
+2021-02-24,Theory of the $sp-d$ coupling of transition metal impurities with free carriers in ZnO,"The $s,p-d$ exchange coupling between the spins of band carriers and of
+transition metal (TM) dopants ranging from Ti to Cu in ZnO is studied within
+the density functional theory. The $+U$ corrections are included to reproduce
+the experimental ZnO band gap and the dopant levels. The $p-d$ coupling reveals
+unexpectedly complex features. In particular, (i) the $p-d$ coupling constants
+$N_0\beta$ vary about 10 times when going from V to Cu, (ii) not only the value
+but also the sign of $N_0\beta$ depends on the charge state of the dopant,
+(iii) the $p-d$ coupling with the heavy holes and the light holes is not the
+same; in the case of Fe, Co and Ni, $N_0\beta$s for the two subbands can differ
+twice, and for Cu the opposite sign of the coupling is found for light and
+heavy holes. The main features of the $p-d$ coupling are determined by the
+$p-d$ hybridization between the $d$(TM) and $p$(O) orbitals. In contrast, the
+$s-d$ coupling constant $N_0\alpha$ is almost the same for all TM ions, and
+does not depend on the charge state of the dopant. The TM-induced spin
+polarization of the $p$(O) orbitals contributes to the $s-d$ coupling,
+enhancing $N_0\alpha$.",2102.12338v1
+2002-05-09,Coexistence of spin-triplet superconductivity and ferromagnetism induced by the Hund's rule exchange,"We discuss general implications of the local spin-triplet pairing among
+correlated fermions that is induced by the Hund's rule coupling in orbitally
+degenerate systems. The quasiparticle energies, the magnetic moment, and the
+superconducting gap are determined for principal superconducting phases, in the
+situation with the exchange field induced by both the local Coulomb and the
+Hund's rule exchange interactions. The phase diagram, as well as the evolution
+in an applied magnetic field of the spin-triplet paired states near the Stoner
+threshold is provided for a model two-band system. The appearance of the
+spin-polarized superconducting phase makes the Stoner threshold a hidden
+critical point, since the pairing creates a small but detectable uniform
+magnetization. The stability of the superconducting state against the
+ferromagnetism with an alternant orbital ordering appearing in the
+strong-coupling limit is also discussed.",0205203v1
+2004-10-08,Intense terahertz laser fields on a two-dimensional electron gas with Rashba spin-orbit coupling,"The spin-dependent density of states and the density of spin polarization of
+an InAs-based two-dimensional electron gas with the Rashba spin-orbit coupling
+under an intense terahertz laser field are investigated by utilizing the
+Floquet states to solve the time-dependent Schr\""odinger equation.
+  It is found that both densities are strongly affected by the terahertz laser
+field. Especially a terahertz magnetic moment perpendicular to the external
+terahertz laser field in the electron gas is induced. This effect can be used
+to convert terahertz electric signals into terahertz magnetic ones efficiently.",0410186v2
+2005-10-01,Spin-polarized proximity effect in superconducting junctions,"We study spin dependent phonomena in superconducting junctions in both
+ballistic and diffusive regimes. For ballistic junctions we study both
+ferromagnet / $s$- and d-wave superconductor junctions and two dimensional
+electron gas / s-wave superconductor junctions with Rashba spin-orbit coupling.
+It is shown that the exchange field alway suppresses the conductance while the
+Rashba spin-orbit coupling can enhance it. In the latter part of the article we
+study the diffusive ferromagnet / insulator / $s$- and d-wave superconductor
+junctions, where the proximity effect can be enhanced by the exchange field in
+contrast to common belief. It is shown that the resonant proximity effect
+originating from the exchange field strongly influences the tunneling
+conductance and density of states.",0510008v2
+2006-01-07,Fermi Surface and Anisotropic Spin-Orbit Coupling of Sb(111) studied by Angle-Resolved Photoemission Spectroscopy,"High-resolution angle-resolved photoemission spectroscopy has been performed
+on Sb(111) to elucidate the origin of anomalous electronic properties in
+group-V semimetal surfaces. The surface was found to be metallic despite the
+semimetallic character of bulk. We clearly observed two surface-derived Fermi
+surfaces which are likely spin split, demonstrating that the spin-orbit
+interaction plays a dominant role in characterising the surface electronic
+states of group-V semimetals. Universality/disimilarity of the electronic
+structure in Bi and Sb is discussed in relation to the granular
+superconductivity, electron-phonon coupling, and surface charge/spin density
+wave.",0601133v1
+2006-06-14,Electronic structure and transport for a laser-field-irradiated quantum wire with Rashba spin-orbit coupling,"We investigate theoretically the electronic structure and transport for a
+two-level quantum wire with Rashba spin-orbit coupling (SOC) under the
+irradiation of an external laser field at low temperatures. The photon-induced
+transitions between SOC-splitted subbands with the same lateral confinement
+quantum numbers and between subbands with different confinement quantum number
+are expected. Using the method of equation of motion (EOM) for Keldysh
+nonequilibrium Green's functions (NGF), we examine the time-averaged density of
+states (DOS) and the spin polarized conductance for the system with photon
+polarization perpendicular to the wire direction. Through the analytical
+analysis and some numerical examples, the interplay effects of the external
+laser field and the Rashba SOC on both the DOS and the conductance of the
+system are demonstrated and discussed. It is found that the external laser
+field can adjust the spin polarization rate and the transport of the quantum
+wire system with some proper Rashba SOC strengths.",0606379v1
+2006-07-10,Spin Fine Structure in Optically Excited Quantum Dot Molecules,"The interaction between spins in coupled quantum dots is revealed in distinct
+fine structure patterns in the measured optical spectra of InAs/GaAs double
+quantum dot molecules containing zero, one, or two excess holes. The fine
+structure is explained well in terms of a uniquely molecular interplay of spin
+exchange interactions, Pauli exclusion and orbital tunneling. This knowledge is
+critical for converting quantum dot molecule tunneling into a means of
+optically coupling not just orbitals, but spins.",0607241v4
+2006-09-13,Tunneling currents in ferromagnetic systems with multiple broken symmetries,"SHORTENED ABSTRACT: A system exhibiting multiple simultaneously broken
+symmetries offers the opportunity to influence physical phenomena such as
+tunneling currents by means of external control parameters. In this paper, we
+consider the broken SU(2) (internal spin) symmetry of ferromagnetic systems
+coexisting with \textit{i)} the broken U(1) symmetry of superconductors and
+\textit{ii)} the broken spatial inversion symmetry induced by a Rashba term in
+a spin-orbit coupling Hamiltonian. In order to study the effect of these broken
+symmetries, we consider tunneling currents that arise in two different systems;
+tunneling junctions consisting of non-unitary spin-triplet ferromagnetic
+superconductors and junctions consisting of ferromagnets with spin-orbit
+coupling.",0609314v2
+2007-01-30,Excitonic condensation under spin-orbit coupling and BEC-BCS crossover,"The condensation of electron-hole (e-h) pairs is studied at zero temperature
+and in the presence of a weak spin-orbit coupling (SOC) in the inversion-layer
+quantum wells. Under realistic conditions, a perturbative SOC can have
+observable effects in the order parameter of the experimentally
+long-searched-for excitonic condensate. Firstly, the fermion exchange symmetry
+is absent for the e-h pairs indicating a counterexample to the known
+classification schemes of fermion pairing. With the lack of fermion exchange,
+the condensate spin has no definite parity. Additionally, the excitonic SOC
+breaks the rotational symmetry yielding a complex order parameter in an
+unconventional way, i.e. the phase pattern of the order parameter is a function
+of the condensate density. This is manifested through finite off diagonal
+components of the static spin susceptibility, suggesting a new experimental
+method to confirm an excitonic condensate.",0701751v3
+2010-04-26,Fermiology and transport properties of the half-metallic itinerant ferromagnet CoS$_2$: influence of spin orbit coupling,"Electronic structure calculations were performed on the compound CoS$_2$, an
+itinerant ferromagnet whose magnetic properties can be understood in terms of
+spin fluctuation theory. We have identified nesting features in the Fermi
+surface of the compound, active for long wavelength spin fluctuations. The
+electronic structure of the material is close to a half-metal. We show the
+importance of introducing spin-orbit coupling (SOC) in the calculations, that
+partially destroys the half-metallicity of the material. By means of transport
+properties calculations, we have quantified the influence of SOC in the
+conductivity at room temperature, with an important decrease comparing to the
+GGA alone conductivity. SOC also helps to understand the negative 0 of the
+material, whose conductivity varies by a few percent with the introduction of
+small perturbations in the states around the Fermi level.",1004.4472v1
+2011-06-08,Topological Order and Semions in a Strongly Correlated Quantum Spin Hall Insulator,"We provide a self-consistent mean-field framework to study the effect of
+strong interactions in a quantum spin Hall insulator on the honeycomb lattice.
+We identify an exotic phase for large spin-orbit coupling and intermediate
+Hubbard interaction. This phase is gapped in the bulk, has gapless edge states
+and does not break any symmetry. Instead, we find a four-fold topological
+degeneracy of the ground state on the torus and fractionalized excitations with
+semionic mutual braiding statistics. Our work highlights the important theme
+that interesting phases arise in the regime of strong spin-orbit coupling and
+interactions.",1106.1559v2
+2011-12-20,Experimental observation of the spin Hall effect of light on a nano-metal film via weak measurements,"We theorize the spin Hall effect of light (SHEL) on a nano-metal film and
+demonstrate it experimentally via weak measurements. A general propagation
+model to describe the relationship between the spin-orbit coupling and the
+thickness of the metal film is established. It is revealed that the spin-orbit
+coupling in the SHEL can be effectively modulated by adjusting the thickness of
+the metal film, and the transverse displacement is sensitive to the thickness
+of metal film in certain range for horizontal polarization light. Importantly,
+a large negative transverse shift can be observed as a consequence of the
+combined contribution of the ratio and the phase difference of Fresnel
+coefficients.",1112.4560v3
+2012-02-26,Quantum Anomalous Hall Effect in Flat Band Ferromagnet,"We proposed a theory of quantum anomalous Hall effect in a flat-band
+ferromagnet on a two-dimensional (2D) decorated lattice with spin-orbit
+coupling. Free electrons on the lattice have dispersionless flat bands, and the
+ground state is highly degenerate when each lattice site is occupied averagely
+by one electron, i.e., the system is at half filling. The on-site Coulomb
+interaction can remove the degeneracy and give rise to the ferrimagnetism,
+which is the coexistence of the ferromagnetic and antiferromagnetic long-range
+orders. On the other hand the spin-orbit coupling makes the band structure
+topologically non-trivial, and produces the quantum spin Hall effect with a
+pair of helical edge states around the system boundary. Based on the rigorous
+results for the Hubbard model, we found that the Coulomb interaction can
+provide an effective staggered potential and turn the quantum spin Hall phase
+into a quantum anomalous Hall phase.",1202.5747v1
+2012-03-09,Symmetry classification of spin-orbit coupled spinor Bose-Einstein condensates,"We develop a symmetry classification scheme to find ground states of pseudo
+spin-1/2, spin-1, and spin-2 spin-orbit coupled spinor Bose-Einstein
+condensates, and show that as the SO(2) symmetry of simultaneous spin and space
+rotations is broken into discrete cyclic groups, various types of lattice
+structures emerge in the absence of a lattice potential, examples include two
+different kagaome lattices for pseudo spin-1/2 condensates and a nematic vortex
+lattice in which uniaxial and biaxial spin textures align alternatively for
+spin-2 condensates. For the pseudo spin-1/2 system, although mean-field states
+always break time-reversal symmetry, there exists a time-reversal invariant
+many-body ground state, which is fragmented and expected to be observed in a
+micro-condensate.",1203.2005v3
+2012-08-09,Superconducting pairing symmetry on the extended Hubbard model in the presence of the Rashba-type spin-orbit coupling,"In order to study the pairing symmetry in non-centrosymmetric
+superconductors, we solve the linearized Eliashberg's equation on the
+two-dimensional extended Hubbard model in the presence of the Rashba-type
+spin-orbit coupling (RSOC) within the random phase approximation. In the
+presence of the RSOC, three types of pairing symmetries appear in the phase
+diagram with respect to the on-site Coulomb repulsion U and off-site one V.
+Each of pairing symmetries is admixture of spin-singlet and -triplet ones. On
+the basis of analytical study, it is found that the admixture of spin-singlet
+and -triplet components depends on not only the predominant pairing symmetry
+but also dispersion relation and pairing interaction.",1208.2190v1
+2012-11-13,Gate control of Berry phase in III-V semiconductor quantum dots,"Berry phase in semiconductor quantum dots (QDs) can be induced by moving the
+dots adiabatically in a closed loop with the application of the distortion
+potential in the lateral direction. We show that the Berry phase is highly
+sensitive to the electric fields arising from the interplay between the Rashba
+and the Dresselhaus spin-orbit couplings. We report that the accumulated Berry
+phase can be induced from other available quantum state that are only differed
+by one quantum number of the same spin state. The sign change in the g-factor
+due to the penetration of the Bloch wavefunctions into the barrier material can
+be reflected in the Berry phase. We solve the time dependent
+Schr$\mathrm{\ddot{o}}$dinger equation and investigate the evolution of the
+spin dynamics during the adiabatic movement of the QDs in the 2D plane. Our
+results might open the possibilities of building a topological quantum dot
+quantum computer where the Berry phase can be engineered and can be manipulated
+with the application of the spin-orbit couplings through gate controlled
+electric fields.",1211.2936v2
+2013-04-26,Interplay between symmetry and spin-orbit coupling in graphene nanoribbons,"We study the electronic structure of chiral and achiral graphene nanoribbons
+with symmetric edges, including curvature and spin-orbit effects. Curved
+ribbons show spin-split bands, whereas flat ribbons present spin-degenerate
+bands. We show that this effect is due to the breaking of spatial inversion
+symmetry in curved graphene nanoribbons, while flat ribbons with symmetric
+edges possess an inversion center, regardless of their having chiral or achiral
+edges. We find an enhanced edge-edge coupling and a substantial gap in narrow
+chiral nanoribbons, which is not present in zigzag ribbons of similar width. We
+attribute these size effects to the mixing of the sublattices imposed by the
+edge geometry, yielding a distinct behavior of chiral ribbons from those with
+pure zigzag edges.",1304.7137v2
+2013-06-11,Topological quantum phase transitions in the spin-singlet superconductor with Rashba and Dresselhaus (110) spin-orbit couplings,"We examine the topological properties of a spin-singlet superconductor with
+Rashba and Dresselhaus (110) spin-orbit couplings. We demonstrate that there
+are several topological invariants in the Bogoliubov-de Gennes (BdG)
+Hamiltonian by symmetry analysis. We use the Pfaffian invariant $\mathcal{P}$
+for the particle-hole symmetry to demonstrate all the possible phase diagrams
+of the BdG Hamiltonian. We find that the edge spectrum is either Dirac cone or
+flat band which supports the emergence of the Majorana fermion in this system.
+For the Majorana flat bands, a higher symmetric BdG Hamiltonian is needed to
+make them topologically stable. The Pfaffian invariant $\mathcal{P}(k_{y})$ and
+the winding number $\mathcal{W}(k_{y})$ are used in determining the location of
+the Majorana flat bands.",1306.2436v1
+2013-07-01,The Two-Band Luttinger Liquid with Spin-Orbit Coupling: Applications to Monatomic Chains on Surfaces,"Recently, monatomic chains on surfaces have been synthesized which show
+evidence of Luttinger liquid physics. The experimental data point to a
+dispersion along the chain with four Fermi points. Here we investigate a
+general low-energy effective Hamiltonian for such a two-band model where SU(2)
+spin symmetry is broken but time reversal symmetry persists, as is expected due
+to the surface geometry. Spin-orbit coupling gives rise to a new energy scale
+epsilon_{SO} much smaller than the Fermi energy epsilon_F and to spin
+non-conserving scattering processes. We derive the generic phase diagram at
+zero temperature as well as an effective phase diagram at temperatures
+epsilon_{SO} < T << epsilon_F. For the part of the phase diagram where a
+Luttinger liquid is found to be stable, the density of states and the spectral
+function are calculated and discussed in relation to the experimental data.",1307.0344v2
+2013-11-12,Spin-orbit coupling induced semi-metallic state in the 1/3 hole doped hyper-kagome Na3Ir3O8,"The complex iridium oxide Na3Ir3O8 with a B-site ordered spinel structure was
+synthesized in single crystalline form, where the chiral hyper-kagome lattice
+of Ir atoms, as observed in the spin-liquid candidate Na4Ir3O8, was identified.
+The average valence of Ir is 4.33+ and, therefore, Na3Ir3O8 can be viewed as a
+doped analogue of the hyper-kagome spin liquid with Ir4+. The transport
+measurements showed that Na3Ir3O8 is in fact a semi-metal. The electronic
+structure calculation demonstrated that the strong spin-orbit coupling of Ir
+yields the semi-metallic state out of an otherwise band insulating state, which
+may harbor exotic topological effects embedded in the hyper-kagome lattice.",1311.2885v2
+2014-04-04,Topological invariants in interacting Quantum Spin Hall: a Cluster Perturbation Theory approach,"Using Cluster Perturbation Theory we calculate Green's functions,
+quasi-particle energies and topological invariants for interacting electrons on
+a 2-D honeycomb lattice, with intrinsic spin-orbit coupling and on-site e-e
+interaction. This allows to define the parameter range (Hubbard U vs spin-orbit
+coupling) where the 2D system behaves as a trivial insulator or Quantum Spin
+Hall insulator. This behavior is confirmed by the existence of gapless
+quasi-particle states in honeycomb ribbons. We have discussed the importance of
+the cluster symmetry and the effects of the lack of full translation symmetry
+typical of CPT and of most Quantum Cluster approaches. Comments on the limits
+of applicability of the method are also provided.",1404.1287v3
+2014-07-01,Weak localization in low-symmetry quantum wells,"Theory of weak localization is developed for electrons in semiconductor
+quantum wells grown along [110] and [111] crystallographic axes. Anomalous
+conductivity correction caused by weak localization is calculated for
+symmetrically doped quantum wells. The theory is valid for both ballistic and
+diffusion regimes of weak localization in the whole range of classically weak
+magnetic fields. We demonstrate that in the presence of bulk inversion
+asymmetry the magnetoresistance is negative: The linear in the electron
+momentum spin-orbit interaction has no effect on the conductivity while the
+cubic in momentum coupling suppresses weak localization without a change of the
+correction sign. Random positions of impurities in the doping layers in
+symmetrically doped quantum wells produce electric fields which result in
+position-dependent Rashba coupling. This random spin-orbit interaction leads to
+spin relaxation which changes the sign of the anomalous magnetoconductivity.
+The obtained expressions allow determination of electron spin relaxation times
+in (110) and (111) quantum wells from transport measurements.",1407.0182v1
+2014-09-16,Theory of diffusive φ0 Josephson junctions in the presence of spin-orbit coupling,"We present a full microscopic theory based on the SU(2) covariant formulation
+of the quasiclassical formalism to describe the Josephson current through an
+extended superconductor-normal metal- superconductor (SNS) diffusive junction
+with an intrinsic spin-orbit coupling (SOC) in the presence of a spin-splitting
+field h. We demonstrate that the ground state of the junction corresponds to a
+finite intrinsic phase difference 0 < {\phi}0 < 2{\pi} between the
+superconductor electrodes provided that both, h and the SOC-induced SU(2)
+Lorentz force are finite. In the particular case of a Rashba SOC we present
+analytic and numerical results for {\phi}0 as a function of the strengths of
+the spin fields, the length of the junction, the temperature and the properties
+of SN interfaces.",1409.4563v1
+2014-10-16,Superconductivity in cubic noncentrosymmetric PdBiSe Crystal,"Mixing of spin singlet and spin triplet superconducting pairing state is
+expected in noncentrosymmetric superconductors (NCS) due to the inherent
+presence of Rashba-type antisymmetric spin-orbit coupling. Unlike low symmetry
+(tetragonal or monoclinic) NCS, parity is isotropicaly broken in space for
+cubic NCS and can additionally lead to the coexistence of magnetic and
+superconducting state under certain conditions. Motivated with such enriched
+possibility of unconventional superconducting phases in cubic NCS we are
+reporting successful formation of single crystalline cubic noncentrosymmetric
+PdBiSe with lattice parameter a = 6.4316 {\AA} and space group P2_1 3 (space
+group no. 198) which undergoes to superconducting transition state below 1.8 K
+as measured by electrical transport and AC susceptibility measurements.
+Significant strength of Rashba-type antisymmetric spin-orbit coupling can be
+expected for PdBiSe due to the presence of high Z (atomic number) elements
+consequently making it potential candidate for unconventional
+superconductivity.",1410.4459v1
+2014-11-26,Bose-Einstein condensates with localized spin-orbit coupling: soliton complexes and spinor dynamics,"Spin-orbit (SO) coupling can be introduced in a Bose--Einstein condensate
+(BEC) as a gauge potential acting only in a localized spatial domain. Effect of
+such a SO ""defect"" can be understood by transforming the system to the
+integrable vector model. The properties of the SO-BEC change drastically if the
+SO defect is accompanied by the Zeeman splitting. In such a non-integrable
+system, the SO defect qualitatively changes the character of soliton
+interactions and allows for formation of stable nearly scalar soliton complexes
+with almost all atoms concentrated in only one dark state. These solitons exist
+only if the number of particles exceeds a threshold value. We also report on
+the possibility of transmission and reflection of a soliton upon its scattering
+on the SO defect. Scattering strongly affects the pseudo-spin polarization and
+can induce pseudo-spin precession. The scattering can also result in almost
+complete atomic transfer between the dark states.",1411.7322v1
+2015-05-10,Oscillation of the spin-currents of cold atoms on a ring due to light-induced spin-orbit coupling,"The evolution of two-component cold atoms on a ring with spin-orbit coupling
+has been studied analytically for the case with N noninteracting particles.
+Then, the effect of interaction is evaluated numerically via a two-body system.
+Two cases are considered: (i) Starting from a ground state the evolution is
+induced by a sudden change of the laser field, and (ii) Starting from a
+superposition state. Oscillating persistent spin-currents have been found. A
+set of formulae have been derived to describe the period and amplitude of the
+oscillation. Based on these formulae the oscillation can be well controlled via
+adjusting the parameters of the laser beams. In particular, it is predicted
+that movable stripes might emerge on the ring.",1505.02401v1
+2015-09-16,Antiferromagnetic order in CeCoIn5 oriented by spin-orbital coupling,"An incommensurate spin density wave ($Q$ phase) confined inside the
+superconducting state at high basal plane magnetic field is an unique property
+of the heavy fermion metal CeCoIn$_5$. The neutron scattering experiments and
+the theoretical studies point out that this state come out from the soft mode
+condensation of magnetic resonance excitations. We show that the fixation of
+direction of antiferromagnetic modulations by a magnetic field reported by
+Gerber et al., Nat. Phys. {\bf 10}, 126 (2014) is explained by spin-orbit
+coupling. This result, obtained on the basis of quite general phenomenological
+arguments, is supported by the microscopic derivation of the $\chi_{zz}$
+susceptibility dependence on the mutual orientation of the basal plane magnetic
+field and the direction of modulation of spin polarization in a multi-band
+metal.",1509.04915v4
+2015-09-24,Skyrmions in Chiral Magnets with Rashba and Dresselhaus Spin-Orbit Coupling,"Skyrmions are topological spin textures of interest for fundamental science
+and applications. Previous theoretical studies have focused on systems with
+broken bulk inversion symmetry, where skyrmions are stabilized by easy-axis
+anisotropy. We investigate here systems that break surface inversion symmetry,
+in addition to possible broken bulk inversion. This leads to two distinct
+Dzyaloshinskii-Moriya (DM) terms with strengths $D_\perp$, arising from Rashba
+spin-orbit coupling (SOC), and $D_\parallel$ from Dresselhaus SOC. We show that
+skyrmions become progressively more stable with increasing
+$D_\perp/D_\parallel$, extending into the regime of easy-plane anisotropy. We
+find that the spin texture and topological charge density of skyrmions develops
+nontrivial spatial structure, with quantized topological charge in a unit cell
+given by a Chern number. Our results give a design principle for tuning Rashba
+SOC and magnetic anisotropy to stabilize skyrmions in thin films, surfaces,
+interfaces and bulk magnetic materials that break mirror symmetry.",1509.07508v2
+2015-10-05,Relativistic ponderomotive Hamiltonian of a Dirac particle in a vacuum laser field,"We report a point-particle ponderomotive model of a Dirac electron
+oscillating in a high-frequency field. Starting from the Dirac Lagrangian
+density, we derive a reduced phase-space Lagrangian that describes the
+relativistic time-averaged dynamics of such a particle in a geometrical-optics
+laser pulse propagating in vacuum. The pulse is allowed to have an arbitrarily
+large amplitude (provided radiation damping and pair production are negligible)
+and a wavelength comparable to the particle de Broglie wavelength. The model
+captures the Bargmann-Michel-Telegdi (BMT) spin dynamics, the Stern-Gerlach
+spin-orbital coupling, the conventional ponderomotive forces, and the
+interaction with large-scale background fields. Agreement with the BMT spin
+precesison equation is shown numerically. The commonly known theory in which
+ponderomotive effects are incorporated in the particle effective mass is
+reproduced as a special case when the spin-orbital coupling is negligible. This
+model could be useful for studying laser-plasma interactions in relativistic
+spin-$1/2$ plasmas.",1510.01268v2
+2015-10-20,Spin-orbital and spin Kondo effects in parallel coupled quantum dots,"Strong electron correlations and interference effects are discussed in
+parallel-coupled single-level and orbitally doubly degenerate quantum dots. The
+finite-U mean-field slave boson approach is used to study many-body effects.
+The analysis is carried out in a wide range of parameter space including both
+atomic-like and molecular-like Kondo regimes and taking into account various
+perturbations, like interdot tunneling, interdot interaction, mixing of the
+electrode channels and exchange interaction. We also discuss the influence of
+singularities of electronic structure and the impact of polarization of
+electrodes. Special attention is paid to potential spintronic applications of
+these systems showing how current polarization can be controlled by adjusting
+interference conditions and correlations by gate voltage. Simple proposals of
+double dot spin valve and bipolar electrically tunable spin filter are
+presented.",1510.05853v1
+2017-08-07,Disorder-induced topological phase transitions on Lieb lattices,"Motivated by the very recent experimental realization of electronic Lieb
+lattices and research interest on topological states of matter, we study the
+topological phase transitions driven by Anderson disorder on spin-orbit coupled
+Lieb lattices in the presence of spin-independent and dependent potentials. By
+combining the numerical transport and self-consistent Born approximation
+methods, we found that both time-reversal invariant and broken Lieb lattices
+can host disorder-induced gapful topological phases, including the quantum spin
+Hall insulator (QSHI) and quantum anomalous Hall insulator (QAHI) phases. For
+the time-reversal invariant case, this disorder can induce a topological phase
+transition directly from normal insulator (NI) to the QSHI. While for the
+time-reversal broken case, the disorder can induce either a QAHI-QSHI phase
+transition or a NI-QAHI-QSHI phase transition. Remarkably, the time-reversal
+broken QSHI phase can be induced by Anderson disorder on the spin-orbit coupled
+Lieb lattices without time-reversal symmetry.",1708.02121v2
+2018-11-26,"Direct Observation of Topological Edge States in Silicon Photonic Crystals: Spin, Dispersion, and Chiral Routing","Topological protection in photonics offers new prospects for guiding and
+manipulating classical and quantum information. The mechanism of spin-orbit
+coupling promises the emergence of edge states that are helical; exhibiting
+unidirectional propagation that is topologically protected against
+back-scattering. We directly observe the topological states of a photonic
+analogue of electronic materials exhibiting the quantum Spin Hall effect,
+living at the interface between two silicon photonic crystals with different
+topological order. Through the far-field radiation that is inherent to the
+states' existence we characterize their properties, including linear dispersion
+and low loss. Importantly, we find that the edge state pseudospin is encoded in
+unique circular far-field polarization and linked to unidirectional
+propagation, thus revealing a signature of the underlying photonic spin-orbit
+coupling. We use this connection to selectively excite different edge states
+with polarized light, and directly visualize their routing along sharp chiral
+waveguide junctions.",1811.10739v1
+2020-07-12,Density Dependent Spin-Orbit Coupling in Degenerate Quantum Gases,"In this letter we propose a method to realize a kind of spin-orbit coupling
+in ultracold Bose and Fermi gases whose format and strength depend on density
+of atoms. Our method combines two-photon Raman transition and periodical
+modulation of spin-dependent interaction, which gives rise to the direct Raman
+process and the interaction assisted Raman process, and the latter depends on
+density of atoms. These two processes have opposite effects in term of
+spin-momentum locking and compete with each other. As the interaction
+modulation increases, the system undergoes a crossover from the direct Raman
+process dominated regime to the interaction assisted Raman process dominated
+regime. For this crossover, we show that for bosons, both the condensate
+momentum and the chirality of condensate wave function change sign, and for
+fermions, the Fermi surface distortion is inverted. We highlight that there
+exists an emergent spatial reflection symmetry in the crossover regime, which
+can manifest itself universally in both Bose and Fermi gases. Our method paves
+a way to novel phenomena in a non-abelian gauge field with intrinsic dynamics.",2007.05999v2
+2017-01-09,2D spin-orbit coupling for ultracold atoms in optical lattices,"Spin-orbit coupling (SOC) is at the heart of many exotic band-structures and
+can give rise to many-body states with topological order. Here we present a
+general scheme based on a combination of microwave driving and lattice shaking
+for the realization of time-reversal invariant 2D SOC with ultracold atoms in
+systems with inversion symmetry. We show that the strengths of Rashba and
+Dresselhaus SOC can be independently tuned in a spin-dependent square lattice.
+More generally, our method can be used to open gaps between different spin
+states without breaking time-reversal symmetry. We demonstrate that this allows
+for the realization of topological insulators in the presence of SOC, which is
+closely related to the Kane-Mele model.",1701.02111v2
+2017-04-06,Density inhomogeneities and Rashba spin-orbit coupling interplay in oxide interfaces,"There is steadily increasing evidence that the two-dimensional electron gas
+(2DEG) formed at the interface of some insulating oxides like LaAlO3/SrTiO3 and
+LaTiO3/SrTiO3 is strongly inhomogeneous. The inhomogeneous distribution of
+electron density is accompanied by an inhomogeneous distribution of the
+(self-consistent) electric field confining the electrons at the interface. In
+turn this inhomogeneous transverse electric field induces an inhomogeneous
+Rashba spin-orbit coupling (RSOC). After an introductory summary on two
+mechanisms possibly giving rise to an electronic phase separation accounting
+for the above inhomogeneity,we introduce a phenomenological model to describe
+the density-dependent RSOC and its consequences. Besides being itself a
+possible source of inhomogeneity or charge-density waves, the density-dependent
+RSOC gives rise to interesting physical effects like the occurrence of
+inhomogeneous spin-current distributions and inhomogeneous quantum-Hall states
+with chiral ""edge"" states taking place in the bulk of the 2DEG. The
+inhomogeneous RSOC can also be exploited for spintronic devices since it can be
+used to produce a disorder-robust spin Hall effect.",1704.01852v1
+2009-12-16,Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5),"We present a combined analysis of neutron scattering and photoemission
+measurements on superconducting FeSe(0.5)Te(0.5). The low-energy magnetic
+excitations disperse only in the direction transverse to the characteristic
+wave vector (1/2,0,0), whereas the electronic Fermi surface near (1/2,0,0)
+appears to consist of four incommensurate pockets. While the spin resonance
+occurs at an incommensurate wave vector compatible with nesting, neither
+spin-wave nor Fermi-surface-nesting models can describe the magnetic
+dispersion. We propose that a coupling of spin and orbital correlations is key
+to explaining this behavior. If correct, it follows that these nematic
+fluctuations are involved in the resonance and could be relevant to the pairing
+mechanism.",0912.3205v2
+2019-09-04,Coherent charge and spin oscillations induced by local quenches in nanowires with spin-orbit coupling,"When a local and attractive potential is quenched in a nanowire, the spectrum
+changes its topology from a purely continuum to a continuum and discrete
+portion. We show that, under appropriate conditions, this quench leads to
+stable coherent oscillations in the observables time evolution. In particular,
+we demonstrate that ballistic nanowires with spin-orbit coupling (SOC) exposed
+to a uniform magnetic field are especially suitable to observe this effect.
+Indeed, while in ordinary nanowires the effect occurs only if the strength
+$U_0$ of the attractive potential is sufficiently strong, even a weak value of
+$U_0$ is sufficient in SOC nanowires. Furthermore, in these systems coherent
+oscillations in the spin sector can be generated and controlled electrically by
+quenching the gate voltage acting on the charge sector. We interpret the origin
+of this phenomenon, analyze the effect of variation of the chemical potential
+and the switching time of the quenched attractive potential, and address
+possible implementation schemes.",1909.01574v1
+2019-10-18,Weak-field induced nonmagnetic state in a Co-based honeycomb,"Layered honeycomb magnets are of interest as potential realizations of the
+Kitaev quantum spin liquid (KQSL), a quantum state with long-range spin
+entanglement and an exactly solvable Hamiltonian. Conventional magnetically
+ordered states are present for all currently known candidate materials,
+however, because non-Kitaev terms in the Hamiltonians obscure the Kitaev
+physics. Current experimental studies of the KQSL are focused on 4d- or
+5d-transition-metal-based honeycombs, in which strong spin-orbit coupling can
+be expected, yielding Kitaev interaction that dominate in an applied magnetic
+field. In contrast, for 3d-based layered honeycomb magnets, spin orbit coupling
+is weak and thus Kitaev-physics should be substantially less accessible. Here
+we report our studies on BaCo2(AsO4)2, for which we find that the magnetic
+order associated with the non-Kitaev interactions can be fully suppressed by a
+relatively low magnetic field, yielding a non-magnetic material and implying
+the presence of strong magnetic frustration and weak non-Kitaev interactions.",1910.08577v1
+2019-10-31,Ferromagnetic fluctuations in the Rashba-Hubbard model,"We study the occurrence and the origin of ferromagnetic fluctuations in the
+longitudinal spin susceptibility of the $t$-$t'$-Rashba-Hubbard model on the
+square lattice. The combined effect of the second-neighbor hopping $t'$ and the
+spin-orbit coupling leads to ferromagnetic fluctuations in a broad filling
+region. The spin-orbit coupling splits the energy bands, leading to two van
+Hove fillings, where the sheets of the Fermi surface change their topology.
+Between these two van Hove fillings the model shows ferromagnetic fluctuations.
+We find that these ferromagnetic fluctuations originate from interband
+contributions to the spin susceptibility. These interband contributions only
+arise if there is one holelike and one electronlike Fermi surface, which is the
+case for fillings in between the two van Hove fillings. We discuss implications
+for experimental systems and propose a test on how to identify these types of
+ferromagnetic fluctuations in experiments.",1910.14621v2
+2020-12-11,Graphene with Rashba spin-orbit interaction and coupling to a magnetic layer: Electron states localized at the domain wall,"Electron states localized at a magnetic domain wall in a graphene caplayer
+with Rashba spin-orbit interaction and coupled to a magnetic overlayer are
+studied theoretically. It is shown that two one-dimensional bands of edge modes
+propagating along the domain wall emerge in the energy gap for each Dirac
+point, and the modes associated with different Dirac points K and K' are the
+same. The coefficients describing decay of the corresponding wavefunctions with
+distance from the domain wall contain generally real and imaginary terms.
+Numerical results on the local spin density and on the total spin expected in
+the edge states characterized by the wavenumber $k_y$ are presented and
+discussed. The Chern number for a single magnetic domain on graphene indicates
+that the system is in the quantum anomalous Hall phase, with two chiral modes
+at the edges. In turn, the number of modes localized at the domain wall is
+determined by the difference in Chern numbers on both sides of the wall. These
+numbers are equal to 2 and -2, respectively, so there are four modes localized
+at the domain wall.",2012.06357v3
+2018-08-26,One-dimensional topological metal,"We propose a new type of topological states of matter exhibiting
+topologically nontrivial edge states (ESs) within gapless bulk states (GBSs)
+protected by both spin rotational and reflection symmetries. A model presenting
+such states is simply comprised of a one-dimensional reflection symmetric
+superlattice in the presence of spin-orbit coupling containing odd number of
+sublattices per unit cell. We show that the system has a rich phase diagram
+including a topological metal (TM) phase where nontrivial ESs coexist with
+nontrivial GBSs at Fermi level. Topologically distinct phases can be reached
+through subband gap closing-reopening transition depending on the relative
+strength of inter and intra unit cell spin-orbit couplings. Moreover,
+topological class of the system is AI with an integer topological invariant
+called $\mathbb{Z}$ index. The stability of TM states is also analyzed against
+Zeeman magnetic fields and on-site potentials resulting in that the spin
+rotational symmetry around the lattice direction is a key requirement for the
+appearance of such states. Also, possible experimental realizations are
+discussed.",1808.08530v2
+2019-01-21,Twist-angle dependence of the proximity spin-orbit coupling in graphene on transition-metal dichalcogenides,"We theoretically study the proximity spin-orbit coupling in graphene on
+transition-metal dichalcogenides monolayer stacked with arbitrary twist angles.
+We find that the relative rotation greatly enhances the spin splitting of
+graphene, typically by a few to ten times compared to the non-rotated
+geometry,and the maximum splitting is achieved around $20^\circ$. The induced
+SOC can be changed from the Zeeman-type to the Rashba-type by rotation. The
+spin-splitting is also quite sensitive to the gate-induced potential, and it
+sharply rises when the graphene's Dirac point is shifted toward the TMDC band.
+The theoretical method does not need the exact lattice matching and it is
+applicable to any incommensurate bilayer systems. It is useful for the
+twist-angle engineering of a variety of van der Waals proximity effects.",1901.06769v1
+2019-08-19,Tuning the Topological Features of Quantum-Dot Hydrogen and Helium by a Magnetic Field,"The topological charge of the spin texture in a quantum dot with spin-orbit
+couplings is shown analytically here to be stable against the ellipticity of
+the dot. It is directly tunable by a single magnetic field and is related to
+the \textit{sign} of the Land\'e $g$ factor. In a quantum-dot helium, the
+overall winding number could have different property from that of the
+single-electron case (quantum-dot hydrogen), since tuning the number of
+electron affects the winding number by the Coulomb interaction and the $z$
+component angular momentum $\langle L^{}_z \rangle$. The density profile and
+the spin texture influence each other when the Coulomb interaction is present.
+When $\langle L^{}_z \rangle$ is biased away from an integer by the spin-orbit
+couplings, the rotational symmetry is broken which induces strong density
+deformation. The sign of the topological charge may also be reversed with
+increasing magnetic field. These findings are of major significance since the
+applied magnetic field alone now provides a direct route to control the
+topological properties of quantum dots.",1908.06575v1
+2020-08-14,Topological Superconductivity in Rashba Spin-Orbital Coupling Suppressed Monolayer \{beta}-Bi2Pd,"The weak interlayer Van Der Waals material \{beta}-Bi2Pd has recently been
+established as a strong topological superconductor candidate with
+unconventional spin-triplet pairing and Majorana zero modes at vortices. In
+this letter, we study the topological characters and the superconducting
+pairing, which are still obscure in monolayer \{beta}-Bi2Pd, in light of our
+effective theoretical model. We find that the non-Rashba spin-orbital coupling
+plays a critical role in realizing and tuning various novel topological
+natures. In particular, the spin-triplet p-wave superconducting pairing with
+Majorana zero mode is revealed in monolayer \{beta}-Bi2Pd. Our studies deepen
+the understanding of topology and superconductivity in monolayer \{beta}-Bi2Pd
+and indicate it is a promising platform for achieving low-dimentional
+topological superconductivity.",2008.06260v2
+2017-07-26,Spin-dependent heat and thermoelectric currents in a Rashba ring coupled to a photon cavity,"Spin-dependent heat and thermoelectric currents in a quantum ring with Rashba
+spin-orbit interaction placed in a photon cavity are theoretically calculated.
+The quantum ring is coupled to two external leads with different temperatures.
+In a resonant regime, with the ring structure in resonance with the photon
+field, the heat and the thermoelectric currents can be controlled by the Rashba
+spin-orbit interaction. The heat current is suppressed in the presence of the
+photon field due to contribution of the two-electron and photon replica states
+to the transport while the thermoelectric current is not sensitive to changes
+in parameters of the photon field. Our study opens a possibility to use the
+proposed interferometric device as a tunable heat current generator in the
+cavity photon field.",1707.08416v1
+2017-11-17,Influence of Spin Orbit Coupling in the Iron-Based Superconductors,"We report on the influence of spin-orbit coupling (SOC) in the Fe-based
+superconductors (FeSCs) via application of circularly-polarized spin and
+angle-resolved photoemission spectroscopy. We combine this technique in
+representative members of both the Fe-pnictides and Fe-chalcogenides with ab
+initio density functional theory and tight-binding calculations to establish an
+ubiquitous modification of the electronic structure in these materials imbued
+by SOC. The influence of SOC is found to be concentrated on the hole pockets
+where the superconducting gap is generally found to be largest. This result
+contests descriptions of superconductivity in these materials in terms of pure
+spin-singlet eigenstates, raising questions regarding the possible pairing
+mechanisms and role of SOC therein.",1711.06686v3
+2020-06-17,Exchange-bias controlled correlations in magnetically encapsulated twisted van der Waals dichalcogenides,"Twisted van der Waals materials have become a paradigmatic platform to
+realize exotic correlated states of matter. Here, we show that a twisted
+dichalcogenide bilayer (WSe$_2$) encapsulated between a magnetic van der Waals
+material (CrBr$_3$) features flat bands with tunable valley and spin flavors.
+We demonstrate that, when electron-electron interactions are included,
+spin-ferromagnetic and valley-ferromagnetic states emerge in the flat bands,
+stemming from the interplay between correlations, intrinsic spin-orbit coupling
+and exchange proximity effects. We show that the specific symmetry broken state
+is controlled by the relative alignment of the magnetization of the
+encapsulation, demonstrating the emergence of correlated states controlled by
+exchange bias. Our results put forward a new van der Waals heterostructure
+where symmetry broken states emerge from a genuine interplay between twist
+engineering, spin-orbit coupling and exchange proximity, providing a powerful
+starting point to explore exotic collective states of matter.",2006.09953v2
+2020-06-22,"Probing nodeless superconductivity in LaMSi (M = Ni, Pt) using muon-spin rotation and relaxation","Systems with strong spin-orbit coupling have been a topic of fundamental
+interest in condensed matter physics due to the exotic topological phases and
+the unconventional phenomenon they exhibit. In this particular study, we have
+investigated the superconductivity in the transition-metal ternary
+noncentrosymmetric compounds LaMSi (M = Ni, Pt) with different spin-orbit
+coupling strength, using muon-spin rotation and relaxation measurements.
+Transverse-field measurements made in the vortex state indicate that the
+superconductivity in both materials is fully gapped, with a conventional s-wave
+pairing symmetry and BCS-like magnitudes for the zero-temperature gap energies.
+Zero field measurements suggest a time-reversal symmetry preserved
+superconductivity in both the systems, though a small increase in muon
+depolarization is observed upon decreasing temperature. However, this has been
+attributed to quasi-static magnetic fluctuations.",2006.12172v1
+2021-10-09,Enhancement of spin-orbit coupling and magnetic scattering in hydrogenated graphene,"Spin-orbit coupling (SOC) can provide essential tools to manipulate electron
+spins in two-dimensional materials like graphene, which is of great interest
+for both fundamental physics and spintronics application. In this paper, we
+report the low-field magnetotransport of in situ hydrogenated graphene where
+hydrogen atoms are attached to the graphene surface in continuous low
+temperature and vacuum environment. Transition from weak localization to weak
+antilocalization with increasing hydrogen adatom density is observed,
+indicating enhancing Bychkov-Rashba-type SOC in a mirror symmetry broken
+system. From the low-temperature saturation of phase breaking scattering rate,
+the existence of spin-flip scattering is identified, which corroborates the
+existence of magnetic moments in hydrogenated graphene.",2110.04477v1
+2022-07-12,Nonlinear nonreciprocal transport in antiferromagnets free from spin-orbit coupling,"We theoretically propose a realization of a nonlinear nonreciprocal transport
+in antiferromagnets without relying on the relativistic spin-orbit coupling.
+Through the symmetry and microscopic model analyses, we show that a local spin
+scalar chirality to induce an asymmetric band modulation becomes a source of a
+Drude-type nonlinear transport, while an electric polarization induced by a
+collinear spin configuration in a triangle unit leads to a
+Berry-curvature-dipole-type nonlinear transport. We demonstrate that
+120$^\circ$ antiferromagnetic ordering on a triangular lattice and a breathing
+kagome lattice in an external magnetic field are typical examples. Our results
+open a new direction of designing and engineering functional materials with
+showing rich parity-violating transport phenomena by spontaneous magnetic phase
+transitions.",2207.05857v1
+2022-10-18,Dynamics of Stripe Patterns in Supersolid Spin-Orbit-Coupled Bose Gases,"Despite ground-breaking observations of supersolidity in spin-orbit-coupled
+Bose-Einstein condensates, until now the dynamics of the emerging spatially
+periodic density modulations has been vastly unexplored. Here, we demonstrate
+the nonrigidity of the density stripes in such a supersolid condensate and
+explore their dynamic behavior subject to spin perturbations. We show both
+analytically in infinite systems and numerically in the presence of a harmonic
+trap how spin waves affect the supersolid's density profile in the form of
+crystal waves, inducing oscillations of the periodicity as well as the
+orientation of the fringes. Both these features are well within reach of
+present-day experiments. Our results show that this system is a paradigmatic
+supersolid, featuring superfluidity in conjunction with a fully dynamic
+crystalline structure.",2210.10064v2
+2022-12-30,"Coexistence of Rashba Effect and Spin-valley Coupling in TiX2 (X= Te, S and Se) based Heterostructures","Spin-orbit coupling (SOC) combined with broken inversion symmetry play key
+roles in inducing Rashba effect. The combined spontaneous polarization and
+Rashba effect enable controlling a material's spin degrees of freedom
+electrically. In this work we investigated the electronic band structure for
+several combinations of TiX2 monolayers (X= Te, S and Se): TiTe2/TiSe2,
+TiTe2/TiS2, and TiSe2/TiS2. Based on the observed orbital hybridization between
+the different monolayers in these hetero-structures (HSs), we conclude that the
+most significant Rashba splitting occurs in TiSe2/TiS2. Subsequently, we used
+Fluorine (F) as an adatom over the surface of TiSe2/TiS2 at hollow and top
+sites of the surface to enhance the Rashba intensity, as the F adatom induces
+polarization due to difference in charge distribution. Furthermore, by
+increasing the number of F atoms on the surface, we reinforced the band
+splitting, i.e., we observe Rashba splitting accompanied by Zeeman splitting at
+the valence-band edge states. Berry curvatures at K and K' with equal and
+opposite nature confirms the existence of valley polarization. The
+computationally observed properties suggest that these HSs are promising
+candidates for spin-valley Hall effect devices and other spintronic
+applications.",2212.14508v1
+2023-03-08,Electrical control of spin and valley in spin-orbit coupled graphene multilayers,"Electrical control of magnetism has been a major techonogical pursuit of the
+spintronics community, owing to its far-reaching implications for data storage
+and transmission. Here, we propose and analyze a new mechanism for electrical
+switching of isospin, using chiral-stacked graphene multilayers, such as bernal
+bilayer graphene or rhombohedral trilayer graphene, encapsulated by transition
+metal dichalcogenide (TMD) substrates. Leveraging the proximity-induced
+spin-orbit coupling from the TMD, we demonstrate electrical switching of
+correlation-induced spin and/or valley polarization, by reversing a
+perpendicular displacement field or the chemical potential. We substantiate our
+proposal with both analytical arguments and self-consistent Hartree-Fock
+numerics. Finally, we illustrate how the relative alignment of the TMDs,
+together with the top and bottom gate voltages, can be used to selectively
+switch distinct isospin flavors, putting forward correlated van der Waals
+heterostructures as a promising platform for spintronics and valleytronics.",2303.04855v3
+2023-09-14,Photochemical reaction enabling the engineering of photonic spin-orbit coupling in organic-crystal optical microcavities,"The control and active manipulation of spin-orbit coupling (SOC) in photonic
+systems is fundamental in the development of modern spin optics and topological
+photonic devices. Here, we demonstrate the control of an artificial
+Rashba-Dresselhaus (RD) SOC mediated by photochemical reactions in a
+microcavity filled with an organic single-crystal of photochromic phase-change
+character. Splitting of the circular polarization components of the optical
+modes induced by photonic RD SOC is observed experimentally in momentum space.
+By applying an ultraviolet light beam, we control the spatial molecular
+orientation through a photochemical reaction and with that we control the
+energies of the photonic modes. This way we realize a reversible conversion of
+spin-splitting of the optical modes with different energies, leading to an
+optically controlled switching between circularly and linearly polarized
+emission from our device. Our strategy of in situ and reversible engineering of
+SOC induced by a light field provides a promising approach to actively design
+and manipulate synthetic gauge fields towards future on-chip integration in
+photonics and topological photonic devices.",2309.07652v1
+2023-10-18,Magnetic eight-fold nodal-point and nodal-network fermions in MnB2,"Realizing topological semimetal states with novel emergent fermions in
+magnetic materials is a focus of current research. Based on first-principle
+calculations and symmetry analysis, we reveal interesting magnetic emergent
+fermions in an existing material MnB2. In the temperature range from 157 K to
+760 K, MnB2 is a collinear antiferromagnet. We find the coexistence of
+eightfold nodal points and nodal net close to the Fermi level, which are
+protected by the spin group in the absence of spin-orbit coupling. Depending on
+the Neel vector orientation, consideration of spin-orbit coupling will either
+open small gaps at these nodal features, or transform them into magnetic linear
+and quadratic Dirac points and nodal rings. Below 157 K, MnB2 acquires weak
+ferromagnetism due to spin tilting. We predict that this transition is
+accompanied by a drastic change in anomalous Hall response, from zero above 157
+K to 200 $\Omega\cdot \text{cm}^{-1}$ below 157 K.",2310.11669v1
+2024-02-05,Realizing and detecting Stiefel-Whitney insulators in an optical Raman lattice,"We propose a feasible scheme to realize a four-band Stiefel-Whitney insultor
+(SWI) with spin-orbit coupled ultracold atoms in an optical Raman lattice. Four
+selected spin states are coupled by carefully designed Raman lasers, to
+generate the desired spin-orbit interactions with spacetime inversion symmetry.
+We map out a phase diagram with respect to the experimental parameters, where a
+large topological phase region exists. We further present two distinct
+detection methods to resolve the non-abelian band topology, in both equilibrium
+and dynamical ways. The detection relies on the spin textures extracted from
+the time-of-flight imaging, showing the tomographic signatures in the ground
+states and long-time averaged patterns on certain submanifold via a
+bulk-surface duality. Our work paves a realistic way to explore novel real
+topology with quantum matters.",2402.02777v1
+2024-03-02,Driven charge density modulation by spin density wave and their coexistence interplay in SmFeAsO: A first-principles study,"We use density functional theory to investigate effects of spin-orbit
+coupling and single-stripe-type antiferromagnetic (sAFM) ordering on the
+crystal structure and electronic properties of SmFeAsO. The results indicate
+that AFM ordering causes the crystal structure transition from tetragonal to
+orthorhombic, along with increase in the height of As atoms from Fe layer due
+to magnetostriction. It also leads to the opening of partial band gaps, the
+emergence of a prominent peak near Fermi energy (EF) in the density of states
+(DOS) and a reduction in Fermi surface nesting. The study finds a correlation
+between the calculated area under the DOS curve, spanning from EF to the first
+peak above it, and the optimal electron-doped concentration required for
+inducing superconductivity in SmFeAsO. The findings suggest that spin and
+charge density waves can play important roles in the superconducting mechanism
+of Fe-based superconductors. Our calculations demonstrate that spin-orbit
+coupling reduces electronic correlation.",2403.01111v1
+2024-04-01,Josephson diode effect in a ballistic single-channel nanowire,"When time-reversal and inversion symmetry are broken, superconducting
+circuits may exhibit a so-called diode effect, where the critical currents for
+opposite directions of the current flow differ. In recent years, this effect
+has been observed in a multitude of systems and the different physical
+ingredients that may yield such an effect are well understood. On a microscopic
+level, the interplay between spin-orbit coupling and a Zeeman field may give
+rise to a diode effect in a single Josephson junction. However, so far there is
+no analytical description of the effect within a simple model. Here we study a
+single channel nanowire with Rashba spin-orbit coupling and subject to a Zeeman
+field. We show that the different Fermi velocities and spin projections of the
+two pseudo-spin bands lead to a diode effect. Simple analytical expressions for
+the efficiency can be obtained in limiting cases.",2404.01429v1
+2000-10-04,Kondo ground state in a quantum dot with an even number of electrons,"Kondo conduction has been observed in a quantum dot with an even number of
+electrons at the Triplet-Singlet degeneracy point produced by applying a small
+magnetic field $B$ orthogonal to the dot plane.
+  At a much larger field $ B \sim B_*$, orbital effects induce the reversed
+transition from the Singlet to the Triplet state. We study the newly proposed
+Kondo behavior at this point. Here the Zeeman spin splitting cannot be
+neglected, what changes the nature of the Kondo coupling. On grounds of exact
+diagonalization results in a dot with cylindrical symmetry, we show that, at
+odds with what happens at the other crossing point, close to $B_*$, orbital and
+spin degrees of freedom are ``locked together'', so that the Kondo coupling
+involves a fictitious spin 1/2 only, which is fully compensated by conduction
+electrons under suitable conditions. In this sense, spin at the dot is
+fractionalized. We derive the scaling equation of the system by means of a
+nonperturbative variational approach. The approach is extended to the $B \neq
+B_*$-case and the residual magnetization on the dot is discussed.",0010054v1
+2007-03-20,Skew scattering due to intrinsic spin-orbit coupling in a two-dimensional electron gas,"We present the generalization of the two-dimensional quantum scattering
+formalism to systems with Rashba spin-orbit coupling. Using symmetry
+considerations, we show that the differential scattering cross section depends
+on the spin state of the incident electron, and skew scattering may arise even
+for central spin-independent scattering potentials. The skew scattering effect
+is demonstrated by exact results of a simple hard wall impurity model. The
+magnitude of the effect for short-range impurities is estimated using the first
+Born approximation. The exact formalism we present can serve as a foundation
+for further theoretical investigations.",0703516v2
+2010-04-16,Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit Interaction,"We analyze the dynamics of the helical edge modes of a quantum spin Hall
+state in the presence of a spatially non-uniform Rashba spin-orbit (SO)
+interaction. A randomly fluctuating Rashba SO coupling is found to open a
+scattering channel which causes localization of the edge modes for a weakly
+screened electron-electron (e-e) interaction. A periodic modulation of the SO
+coupling, with a wave number commensurate with the Fermi momentum, makes the
+edge insulating already at intermediate strengths of the e-e interaction. We
+discuss implications for experiments on edge state transport in a HgTe quantum
+well.",1004.2777v2
+2011-09-12,Stabilizing the spiral order with spin-orbit coupling in an anisotropic triangular antiferromagnet,"We study the effects of spin-orbit coupling (SOC) on the large-U Hubbard
+model on anisotropic triangular lattice at half-filling using the
+Schwinger-boson method. We find that the SOC will in general lead to a zero
+temperature condensation of the Schwinger bosons with a single condensation
+momentum. As a consequence, the spin-spin correlation vanishes along the z-axis
+but develops in the $x$-$y$ plane, with the ordering wave vector being
+dramatically dependent on the SOC. Moreover, the phase boundary of the magnetic
+ordered state extends to the region of large spatial anisotropy with increased
+condensation density, demonstrating that the spiral order is always stabilized
+by the SOC.",1109.2364v1
+2014-04-03,Bose-Bose Mixtures with Synthetic Spin-Orbit Coupling in Optical Lattices,"We investigate the ground state properties of Bose-Bose mixtures with
+Rashba-type spin-orbit (SO) coupling in a square lattice. The system displays
+rich physics from the deep Mott-insulator (MI) all the way to the superfluid
+(SF) regime. In the deep MI regime, novel spin-ordered phases arise due to the
+effective Dzyaloshinskii-Moriya type super-exchange interactions. By employing
+the non-perturbative Bosonic Dynamical Mean-Field-Theory (BDMFT), we
+numerically study and establish the stability of these magnetic phases against
+increasing hopping amplitude. We show that as hopping is increased across the
+MI to SF transition, exotic superfluid phases with magnetic textures emerge. In
+particular, we identify a new spin-spiral magnetic texture with spatial period
+3 in the superfluid close to the MI-SF transition.",1404.0970v2
+2014-09-10,Approach for making visible and stable stripes in a spin-orbit-coupled Bose-Einstein superfluid,"The striped phase exhibited by a spin-$1/2$ Bose-Einstein condensate with
+spin-orbit coupling is characterized by the spontaneous breaking of two
+continuous symmetries: gauge and translational symmetry. This is a peculiar
+feature of supersolids and is the consequence of interaction effects. We
+propose an approach to produce striped configurations with high-contrast
+fringes, making their experimental detection in atomic gases a realistic
+perspective. Our approach, whose efficiency is directly confirmed by
+three-dimensional Gross-Pitaevskii simulations, is based on the space
+separation of the two spin components into a two-dimensional bilayer
+configuration, causing the reduction of the effective interspecies interaction
+and the increase of the stability of the striped phase. We also explore the
+effect of a $\pi/2$ Bragg pulse, causing the increase of the fringe wavelength,
+and of a $\pi/2$ rf pulse, revealing the coherent nature of the order parameter
+in the spin channel.",1409.3149v3
+2015-03-04,Dichroism as a probe for parity-breaking phases of spin-orbit coupled metals,"Recently, a general formalism was presented for gyrotropic, ferroelectric,
+and multipolar order in spin-orbit coupled metals induced by spin-spin
+interactions. Here, I point out that the resulting order parameters are
+equivalent to expectation values of operators that determine natural circular
+dichroic signals in optical and x-ray absorption. Some general properties of
+these operator equivalents and the resulting dichroisms are mentioned, and I
+list several material examples in this connection, including Weyl semimetals.
+The particular case of the tensor order in the pyrochlore superconductor
+Cd2Re2O7 is treated in more detail, including calculations of the x-ray
+absorption and circular dichroism at the O K edge.",1503.01501v3
+2016-04-23,Spin Hall Conductivity in the impure two-dimensional Rashba s-wave superconductor,"Based on the Kubo formula approach, the spin Hall conductivity (SHC) of a
+two-dimensional (2D) Rashba s-wave superconductor in the presence of
+nonmagnetic impurities is calculated. We will show that by increasing the
+superconducting gap, the SHC decreases monotonically to zero, while by
+decreasing the concentration of impurities at zero gap, the SHC closes to the
+clean limit universal value . As a function of the impurity relaxation rate at
+and (is the spin-orbit coupling in unit of), we will show that in the dirty
+limit () the SHC vanishes, and by increasing the relaxation time () the SHC
+depends on the value of superconducting gap (), is changed from zero for full
+gap to in zero gap. At low temperatures, the SHC goes to zero exponentially and
+near the critical temperature depending on the concentration of the scattering
+centers, the SHC will tend to the value of normal state. We will also show that
+the SHC is independent of spin-orbit coupling () in the clean limit.",1604.06887v1
+2016-07-06,Hyperfine and spin-orbit coupling effects on decay of spin-valley states in a carbon nanotube,"The decay of spin-valley states is studied in a suspended carbon nanotube
+double quantum dot via leakage current in Pauli blockade and via dephasing and
+decoherence of a qubit. From the magnetic field dependence of the leakage
+current, hyperfine and spin-orbit contributions to relaxation from blocked to
+unblocked states are identified and explained quantitatively by means of a
+simple model. The observed qubit dephasing rate is consistent with the
+hyperfine coupling strength extracted from this model and inconsistent with
+dephasing from charge noise. However, the qubit coherence time, although longer
+than previously achieved, is probably still limited by charge noise in the
+device.",1607.01695v2
+2017-02-27,Breakdown of Magnons in a Strongly Spin-Orbital Coupled Magnet,"The description of quantized collective excitations stands as a landmark in
+the quantum theory of condensed matter. A prominent example occurs in
+conventional magnets, which support bosonic magnons - quantized harmonic
+fluctuations of the ordered spins. In striking contrast is the recent discovery
+that strongly spin-orbital coupled magnets, such as $\alpha$-RuCl$_3$, may
+display a broad excitation continuum inconsistent with conventional magnons.
+Due to incomplete knowledge of the underlying interactions unraveling the
+nature of this continuum remains challenging. The most discussed explanation
+refers to a coherent continuum of fractional excitations analogous to the
+celebrated Kitaev spin liquid. Here we present a more general scenario. We
+propose that the observed continuum represents incoherent excitations
+originating from strong magnetic anharmoniticity that naturally occurs in such
+materials. This scenario fully explains the observed inelastic magnetic
+response of $\alpha$-RuCl$_3$ and reveals the presence of nontrivial
+excitations in such materials extending well beyond the Kitaev state.",1702.08466v3
+2017-08-02,Flocking from a quantum analogy: Spin-orbit coupling in an active fluid,"Systems composed of strongly interacting self-propelled particles can form a
+spontaneously flowing polar active fluid. The study of the connection between
+the microscopic dynamics of a single such particle and the macroscopic dynamics
+of the fluid can yield insights into experimentally realizable active flows,
+but this connection is well understood in only a few select cases. We introduce
+a model of self-propelled particles based on an analogy with the motion of
+electrons that have strong spin-orbit coupling. We find that, within our model,
+self-propelled particles are subject to an analog of the Heisenberg uncertainty
+principle that relates translational and rotational noise. Furthermore, by
+coarse-graining this microscopic model, we establish expressions for the
+coefficients of the Toner-Tu equations---the hydrodynamic equations that
+describe an active fluid composed of these ""active spins."" The connection
+between self-propelled particles and quantum spins may help realize exotic
+phases of matter using active fluids via analogies with systems composed of
+strongly correlated electrons.",1708.00937v1
+2012-04-23,Interaction Induced Hall Response in a Spin-Orbit Coupled Bose-Einstein Condensate,"In this letter we consider the dynamic behaviors of spin-orbit coupled Bose
+condensates realized in recent experiments. We show that there exists an
+interaction induced ac Hall response which is absent in a non-interacting
+system. This condensate has two distinct equilibrium phases known as the plane
+wave phase and the stripe phase. In the plane wave phase, we show that an ac
+longitudinal current will induce an ac radial current in the transverse
+direction, and vice versa, as a cooperation effect of spin-velocity locking and
+spin-dependent interaction. In the stripe phase, we show that the dominant
+longitudinal response to a transverse radial current is sliding of the density
+stripe, because it is the low-lying excitation mode originated from spontaneous
+spatial translational symmetry breaking in this phase.",1204.5121v1
+2014-05-25,Spin Hall phenomenology of magnetic dynamics,"We study the role of spin-orbit interactions in the coupled magnetoelectric
+dynamics of a ferromagnetic film coated with an electrical conductor. While the
+main thrust of this work is phenomenological, several popular simple models are
+considered microscopically in some detail, including Rashba and Dirac
+two-dimensional electron gases coupled to a magnetic insulator, as well as a
+diffusive spin Hall system. We focus on the long-wavelength magnetic dynamics
+that experiences current-induced torques and produces fictitious electromotive
+forces. Our phenomenology provides a suitable framework for analyzing
+experiments on current-induced magnetic dynamics and reciprocal charge pumping,
+including the effects of magnetoresistance and Gilbert-damping anisotropies,
+without a need to resort to any microscopic considerations or modeling.
+Finally, some remarks are made regarding the interplay of spin-orbit
+interactions and magnetic textures.",1405.6354v2
+2017-06-21,Uniform magnetization dynamics of a submicron ferromagnetic coin driven by the spin-orbit coupled spin torque,"A simple model of magnetization dynamics in a ferromagnet/doped semiconductor
+hybrid structure with Rashba spin-orbit interaction (SOI) driven by an applied
+pulse of the electric field is proposed. The electric current excited by the
+applied field is spin-polarized due to the SOI and therefore it induces the
+magnetization rotation in the ferromagnetic layer via s-d exchange coupling.
+Magnetization dynamics dependence on the electric pulse shape and magnitude is
+analyzed for realistic values of parameters. We show that it is similar to the
+dynamics of a damped nonlinear oscillator with the time-dependent frequency
+proportional to the square root of the applied electric field. The
+magnetization switching properties of an elliptic magnetic element are examined
+as a function of the applied field magnitude and direction.",1706.06909v1
+2017-06-26,Ferroelectric control of the giant Rashba spin orbit coupling in GeTe(111)/InP(111) superlattice,"GeTe wins the renewed research interest due to its giant bulk Rashba spin
+orbit coupling (SOC), and becomes the father of a new multifunctional material,
+i.e., ferroelectric Rashba semiconductor. In the present work, we investigate
+Rashba SOC at the interface of the ferroelectric semiconductor superlattice
+GeTe(111)/InP(111) by using the first principles calculation. Contribution of
+the interface electric field and the ferroelectric field to Rashba SOC is
+revealed. A large modulation to Rashba SOC and a reversal of the spin
+polarization is obtained by switching the ferroelectric polarization. Our
+investigation about GeTe(111)/InP(111) superlattice is of great importance in
+the application of ferroelectric Rashba semiconductor in the spin field effect
+transistor.",1706.08256v1
+2018-01-17,Symmetry Breaking of the Persistent Spin Helix in Quantum Transport,"We exploit the high-symmetry spin state obtained for equal Rashba and linear
+Dresselhaus interactions to derive a closed-form expression for the weak
+localization magnetoconductivity -- the paradigmatic signature of spin-orbit
+coupling in quantum transport. The small parameter of the theory is the
+deviation from the symmetry state introduced by the mismatch of the linear
+terms and by the cubic Dresselhaus term. In this regime, we perform quantum
+transport experiments in GaAs quantum wells. Top and back gates allow
+independent tuning of the Rashba and Dresselhaus terms in order to explore the
+broken-symmetry regime where the formula applies. We present a reliable
+two-step method to extract all parameters from fits to the new expression,
+obtaining excellent agreement with recent experiments. This provides
+experimental confirmation of the new theory, and advances spin-orbit coupling
+towards a powerful resource in emerging quantum technologies.",1801.05657v1
+2018-03-06,Supercurrent in ferromagnetic Josephson junctions with heavy metal interlayers,"The lengthscale over which supercurrent from conventional BCS, $s$-wave,
+superconductors ($S$) can penetrate an adjacent ferromagnetic ($F$) layer
+depends on the ability to convert singlet Cooper pairs into triplet Cooper
+pairs. Spin aligned triplet Cooper pairs are not dephased by the ferromagnetic
+exchange interaction, and can thus penetrate an $F$ layer over much longer
+distances than singlet Cooper pairs. These triplet Cooper pairs carry a
+dissipationless spin current and are the fundamental building block for the
+fledgling field of superspintronics. Singlet-triplet conversion by
+inhomogeneous magnetism is well established. Here, we describe an attempt to
+use spin orbit coupling as a new mechanism to mediate singlet-triplet
+conversion in $S-F-S$ Josephson junctions. We report that the addition of thin
+Pt spin-orbit coupling layers in our Josephson junctions significantly
+increases supercurrent transmission, however the decay length of the
+supercurrent is not found to increase. We attribute the increased supercurrent
+transmission to Pt acting as a buffer layer to improve the growth of the Co $F$
+layer.",1803.01965v2
+2019-11-09,Topological defects of spin-orbit coupled Bose-Einstein condensates in a rotating anharmonic trap,"We investigate the topological defects and spin structures of binary
+Bose-Einstein condensates (BECs) with Dresselhaus spin-orbit coupling (D-SOC)
+in a rotating anharmonic trap. Our results show that for initially mixed BECs
+without SOC the increasing rotation frequency can lead to the structural phase
+transition of the system. In the presence of isotropic D-SOC, the system
+sustains vortex pair,Anderson--Toulouse coreless vortices, circular vortex
+sheets, and combined vortex structures. In particular, when the rotation
+frequency is fixed above the radial trapping frequency the strong D-SOC results
+in a peculiar topological structure which is comprised of multi-layer visible
+vortex necklaces, hidden vortex necklaces and a hidden giant vortex. In
+addition, the system exhibits rich spin textures including basic skyrmion,
+meron cluster, skyrmion string and various skyrmion lattices. The skyrmions
+will be destroyed in the limit of large D-SOC or rotation frequency.
+Furthermore, the effects of anisotropic D-SOC and Rashba-Dresselhaus SOC on the
+topological structures of the system are discussed.",1911.03650v1
+2020-10-24,Impurity in a Fermi gas under non-Hermitian spin-orbit coupling,"We study the fate of an impurity in a two-component, non-interacting Fermi
+gas under a non- Hermitian spin-orbit coupling (SOC) which is generated by
+dissipative Raman lasers. While SOC mixes the two spin species in the Fermi gas
+thus modifies the single-particle dispersions, we consider the case where the
+impurity only interacts with one of the spin species. As a result, spectral
+properties of the impurity constitute an ideal probe to the dissipative Fermi
+gas in the background. In particular, we show that dissipation destabilizes
+polarons in favor of molecular formation, consistent with previous few-body
+studies. The dissipative nature of the Fermi gas further leads to broadened
+peaks in the inverse radio-frequency spectra for both the attractive and
+repulsive polaron branches, which could serve as signals for experimental
+observation. Our results provides an exemplary scenario where the interplay of
+non-Hermiticity and interaction can be probed.",2010.12767v1
+2020-11-03,Tunable-spin-model generation with spin-orbit-coupled fermions in optical lattices,"We study the dynamical behaviour of ultracold fermionic atoms loaded into an
+optical lattice under the presence of an effective magnetic flux, induced by
+spin-orbit coupled laser driving. At half filling, the resulting system can
+emulate a variety of iconic spin-1/2 models such as an Ising model, an XY
+model, a generic XXZ model with arbitrary anisotropy, or a collective one-axis
+twisting model. The validity of these different spin models is examined across
+the parameter space of flux and driving strength. In addition, there is a
+parameter regime where the system exhibits chiral, persistent features in the
+long-time dynamics. We explore these properties and discuss the role played by
+the system's symmetries. We also discuss experimentally-viable implementations.",2011.01842v3
+2017-11-23,Magnetic and Electronic Properties of Spin-Orbit Coupled Dirac Electrons on a $(001)$ Thin Film of Double Perovskite Sr$_2$FeMoO$_6$,"We present an interacting model for the electronic and magnetic behavior of a
+strained $(001)$ atomic layer of Sr$_2$FeMoO$_6,$ which shows room-temperature
+ferrimagnetism and magnetoresistance with potential spintronics application in
+the bulk. We find that the strong spin-orbit coupling in the molybdenum 4$d$
+shell gives rise to a robust ferrimagnetic state with an emergent
+spin-polarized electronic structure consisting of flat bands and four massive
+or massless Dirac dispersions. Based on the spin-wave theory, we demonstrate
+that the magnetic order remains intact for a wide range of doping, leading to
+the possibility of exploring flat band physics, such as Wigner crystallization
+in electron-doped Sr$_{2-x}$La$_{x}$FeMoO$_6.$",1711.08674v3
+2019-06-06,Odd-Parity Superconductivity Driven by Octahedra Rotations in Iridium Oxides,"Iridium oxides have provided a playground to study novel phases originating
+from spin-orbit coupling and electron-electron interactions. Among them, the
+d-wave singlet superconductor was proposed for electron-doped Sr$_2$IrO$_4$,
+containing two Ir atoms in a unit cell due to the staggered rotation of oxygen
+octahedra about the c-axis. It was also noted that such oxygen octahedra
+rotation affects electronic transports. Here we study the role of octahedra
+tilting away from the c-axis, in determining superconducting pairing symmetry.
+We show that the octahedra tilting changes the large Fermi surface to a Dirac
+point, which strongly suppresses the conventional d-wave pairing. Furthermore,
+it also promotes effective spin-triplet interactions in the strong Hubbard
+interaction limit, leading to a transition from the even-parity to odd-parity
+superconducting phase. Thus, tuning octahedra distortions can be used as a tool
+to engineer a spin triplet superconductor in strongly correlated systems with
+strong spin-orbit coupling.",1906.02749v1
+2022-05-30,Spin-orbit-derived giant magnetoresistance in a layered magnetic semiconductor AgCrSe2,"Two-dimensional magnetic materials have recently attracted great interest due
+to their unique functions as the electric field control of a magnetic phase and
+the anomalous spin Hall effect. For such remarkable functions, a spin-orbit
+coupling (SOC) serves as an essential ingredient. Here we report a giant
+positive magnetoresistance in a layered magnetic semiconductor AgCrSe2, which
+is a manifestation of the subtle combination of the SOC and Zeeman-type spin
+splitting. When the carrier concentration approaches the critical value of
+2.5\times10^18 cm^-3, a sizable positive magnetoresistance of ~400 % emerges
+upon the application of magnetic fields normal to the conducting layers. Based
+on the magneto-Seebeck effect and the first-principles calculations, the
+unconventional magnetoresistance is ascribable to the enhancement of effective
+carrier mass in the SOC induced J = 3/2 state, which is tuned to the Fermi
+level through the Zeeman splitting enhanced by the p-d coupling. This study
+demonstrates a new aspect of the SOC-derived magnetotransport in
+two-dimensional magnetic semiconductors, paving the way to novel spintronic
+functions.",2205.14795v1
+2022-06-08,Tunable zero-energy Dirac and Luttinger nodes in a two-dimensional topological superconductor,"Cooper pairing in ultrathin films of topological insulators, induced
+intrinsically or by proximity effect, can produce an energetically favorable
+spin-triplet superconducting state. The spin-orbit coupling acts as an SU(2)
+gauge field and stimulates the formation of a spin-current vortex lattice in
+this superconducting state. Here we study the Bogoliubov quasiparticles in such
+a state and find that the quasiparticle spectrum consists of a number of Dirac
+nodes pinned to zero energy by the particle-hole symmetry. Some nodes are
+""accidental"" and move through the first Brillouin zone along high-symmetry
+directions as the order parameter magnitude or the strength of the spin-orbit
+coupling are varied. At special parameter values, nodes forming neutral
+quadruplets merge and become gapped out, temporarily producing a quadratic
+band-touching spectrum. All these features are tunable by controlling the order
+parameter magnitude via a gate voltage in a heterostructure device. In addition
+to analyzing the spectrum at the mean-field level, we briefly discuss a few
+experimental signatures of this spectrum.",2206.04065v2
+2022-08-15,Emergent chiral symmetry in non-bipartite kagome and pyrochlore lattices with spin-orbit coupling,"Chiral symmetry in energy bands appears as perfectly symmetric anti-bonding
+and bonding pairs of energy levels. It has only been observed in a few classes
+of models with a bipartite lattice structure or Bogoliubov-de-Gennes systems
+having the pairwise basis. We show that the non-bipartite kagome and pyrochlore
+lattices can host chiral symmetric bands when the strong spin-orbit coupling is
+introduced. There, the electrons hop to their neighbors by always converting
+the spin orientation up-side-down, which allows the up and down spin bases to
+form fictitious bipartite connections. The gauge invariant Wilson loop operator
+defined on a triangular unit serves as a marker to detect the presence of
+chiral symmetry, and using this property, the chiral operator is constructed.
+This allows us to access their topological symmetry classes that can easily
+change with small perturbations.",2208.07171v1
+2023-03-07,Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions,"The quest for exotic quantum magnetic ground states, including the Kitaev
+spin liquid and quantum spin-ices, has led to the discovery of several quantum
+materials where low energy pseudospin-$1/2$ doublets arise from the splitting
+of spin-orbit entangled multiplets with higher degeneracy. Such systems include
+$d$-orbital and $f$-orbital Mott insulators. When the gap between the low
+energy pseudospin-$1/2$ levels and the excited levels of the multiplet or
+`excitons' is not large, the effective low-energy exchange interactions between
+the low energy pseudospin-$1/2$ moments can acquire significant corrections
+from coupling to the excitons. We extract these corrections using higher order
+perturbation theory as well as an exact Schrieffer-Wolff transformation. Such
+corrections can impact the exchange matrix for the low energy pseudospin-$1/2$
+levels by renormalizing the strength and the sign of Heisenberg exchange or
+Ising anisotropies, and potentially even inducing bond-anisotropic couplings
+such as Kitaev-$\Gamma$ exchange interactions. We discuss recent experiments on
+various cobaltate and osmate materials which hint at the ubiquity and
+importance of this physics.",2303.04169v1
+2023-06-30,Substrate suppression of oxidation process in pnictogen monolayers,"2D materials present an interesting platform for device designs. However,
+oxidation can drastically change the system's properties, which need to be
+accounted for. Through {\it ab initio} calculations, we investigated
+freestanding and SiC-supported As, Sb, and Bi mono-elemental layers. The
+oxidation process occurs through an O$_2$ spin-state transition, accounted for
+within the Landau-Zener transition. Additionally, we have investigated the
+oxidation barriers and the role of spin-orbit coupling. Our calculations
+pointed out that the presence of SiC substrate reduces the oxidation time scale
+compared to a freestanding monolayer. We have extracted the energy barrier
+transition, compatible with our spin-transition analysis. Besides, spin-orbit
+coupling is relevant to the oxidation mechanisms and alters time scales. The
+energy barriers decrease as the pnictogen changes from As to Sb to Bi for the
+freestanding systems, while for SiC-supported, they increase across the
+pnictogen family. Our computed energy barriers confirm the enhanced robustness
+against oxidation for the SiC-supported systems.",2307.00138v1
+2023-10-22,Properties of an α-T3 Aharonov-Bohm quantum ring: Interplay of Rashba spin-orbit coupling and topological defect,"In this paper we investigate the interplay of the Rashba spin-orbit coupling
+(RSOC) and a topological defect, such as a screw dislocation in an {\alpha}-T3
+Aharonov-Bohm quantum ring and scrutinized the effect of an external transverse
+magnetic field therein. Our study reveals that the energy spectrum follows a
+parabolic dependence on the Burgers vector associated with the screw
+dislocation. Moreover, its presence results in an effective flux, encompassing
+the ramifications due to both the topological flux and that due to the external
+magnetic field. Furthermore, we observe periodic oscillations in the persistent
+current in both charge and spin sectors, with a period equal to one flux
+quantum, which, however suffers a phase shift that is proportional to the
+dislocation present in the system. Such tunable oscillations of the spin
+persistent current highlights potential application of our system to be used as
+spintronic devices. Additionally, we derive and analyse the thermodynamic
+properties of the ring via obtaining the canonical partition function through
+Euler-Maclaurin formula. In particular, we compute the thermodynamic
+potentials, free energies, entropy, and heat capacity and found the latter to
+yield the expected Dulong-Petit law at large temperatures.",2310.14169v1
+2024-02-03,Weyl semimetallic state with antiferromagnetic order in Rashba-Hubbard model,"We study the phase diagram of Rashba-Hubbard model by employing the
+Hartree-Fock meanfield theory, and thereby establish the existence of an
+antiferromagnetically ordered Weyl semimetallic state with in-plane magnetic
+moments. This phase is found to be sandwiched in between the antiferromagnetic
+insulator and Rashba metal in the interaction vs spin-orbit coupling phase
+diagram. The antiferromagnetically-ordered topological semimetallic state
+exists in the presence of combined time-reversal and inversion symmetry though
+individually both are broken. The study of the static magnetic susceptibility
+indicates the robustness of the antiferromagnetic order within a realistic
+range of interaction and spin-orbit coupling parameters. In addition to the
+edge states associated with the Weyl points, we also investigate the
+spin-resolved quasiparticle interference, which provides important insight into
+the possible spin texture of the bands especially in the vicinity of Weyl
+points.",2402.02131v1
+2024-03-19,Dielectric response in twisted MoS2 bilayer facilitated by spin-orbit coupling effect,"Twisted van der Waals bilayers provide ideal two-dimensional (2D) platforms
+to study the interplay between spin and charge degree of freedom of electron.
+An exotic dielectric response behavior in such system is what we find here
+through the investigation of twisted bilayer MoS2 with two different stackings
+but same size of the commensurate supercell, which forms H-type like and R-type
+like stacked bilayer system. Our first-principles calculations show that
+applying an out-of-plane electric field gives rise to different response of the
+electric polarization, whose susceptibility is suppressed in H-type like case
+compared with that of R-type like one. Further analysis shows the dielectric
+response to perpendicular electric field is linked to the moire ferroelectric
+dipole texture. Their underlying link comes from that, through Rashba
+spin-orbit coupling (SOC) effect, the external electric field tends to change
+the internal pseudo-spin texture, which further depends on the twist induced
+dipole texture. Consequently, the suppression of dielectric response can be
+attributed to the topology protection of such ferroelectric dipole structure.",2403.12475v1
+2010-10-06,Orbital degrees of freedom as origin of magnetoelectric coupling in magnetite,"A microscopic understanding of magnetoelectricity, i.e. the coupling between
+magnetic (electric) properties and external electric (magnetic) fields, is a
+crucial milestone for future generations of electrically-controlled spintronic
+devices. Here, we focus on the first magnetoelectric known to mankind:
+magnetite. By means of a joint approach based on phenomenological Landau theory
+and density-functional simulations, we show that magnetoelectricity in
+charge-/orbital-ordered Fe3O4 in the non-centrosymmetric Cc structure is driven
+by the interplay between a peculiar orbital-order and on-site spin-orbit
+coupling. The excellent agreement with available experiments confirms our
+theoretical picture, pointing to magnetite as a prototype of a novel category
+of magnetoelectrics where ferroelectric polarization can be induced, tuned or
+switched via a magnetic field.",1010.1105v2
+2004-05-21,A new numerical algorithm for the double-orbital Hubbard model -- Hund-coupled pairing symmetry in the doped case,"In order to numerically study electron correlation effects in multi-orbital
+systems, we propose a new type of discrete transformation for the exchange
+(Hund's coupling) and pair-hopping interactions to be used in the dynamical
+mean field theory + quantum Monte Carlo method. The transformation, which is
+real and exact, turns out to suppress the sign problem in a wide parameter
+region including non-half-filled bands. This enables us to obtain the dominant
+pairing symmetry in the double-orbital Hubbard model, which shows that the
+spin-triplet, orbital-antisymmetric pairing that exploits Hund's coupling is
+stable in a wide region of the band filling.",0405503v1
+2016-06-06,Band gap tuning and orbital mediated electron phonon coupling in $HoFe_{1-x}Cr_xO_3$,"We report on the evidenced orbital mediated electron phonon coupling and band
+gap tuning in HoFe1-xCrxO3 compounds. From the room temperature Raman
+scattering, it is apparent that the electron-phonon coupling is sensitive to
+the presence of both the Fe and Cr at the B-site. Essentially, an Ag like local
+oxygen breathing mode is activated due to the charge transfer between Fe3+ -
+Cr3+ at around 670 cm-1, this observation is explained on the basis of
+Franck-Condon (FC) mechanism. Optical absorption studies infer that there
+exists a direct band gap in the HoFe1-xCrxO3 compounds. Decrease in band gap
+until x = 0.5 is ascribed to the broadening of the oxygen p orbitals as a
+result of the induced spin disorder due to Fe3+ and Cr3+ at B site. In
+contrast, the increase in band gap above x = 0.5 is explained on the basis of
+the reduction in the available unoccupied d - orbitals of Fe3+ at the
+conduction band. We believe that above results would be helpful for the
+development of the optoelectronic devices based on the ortho-ferrites.",1606.01698v1
+2013-10-23,Neutron scattering measurements of $dd$ and spin-orbit excitations below the Mott-Hubbard gap in CoO,"Neutron scattering is used to investigate the single-ion spin and orbital
+excitations below the Mott-Hubbard gap in CoO. Three excitations are reported
+at 0.870 $\pm$ 0.009 eV, 1.84 $\pm$ 0.03, and 2.30 $\pm$ 0.15 eV. These were
+parameterized within a weak crystal field scheme with an intra-orbital exchange
+of $J(dd)$=1.3 $\pm$ 0.2 eV and a crystal field splitting 10Dq=0.94 $\pm$ 0.10
+eV. A reduced spin-orbit coupling of \lambda=-0.016 $\pm$ 0.003 eV is derived
+from dilute samples of Mg$_{0.97}$Co$_{0.03}$O, measured to remove
+complications due to spin exchange and structural distortion parameters which
+split the cubic phase degeneracy of the orbital excitations complicating the
+inelastic spectrum. The 1.84 eV, while reported using resonant x-ray and
+optical techniques, was absent or weak for non resonant x-ray experiments and
+overlaps with the expected position of a $^{4}A_{2}$ level. This transition is
+absent in the dipolar approximation but expected to have a finite quadrupolar
+matrix element that can be observed with neutron scattering techniques at
+larger momentum transfers. Our results agree with a crystal field analysis (in
+terms of Racah parameters and Tanabe-Sugano diagrams) and with previous
+calculations performed using local-density band theory for Mott insulating
+transition metal oxides. The results also demonstrate the use of neutron
+scattering for measuring dipole forbidden transitions in transition metal oxide
+systems.",1310.6207v1
+2014-01-20,Momentum dependence of spin-orbit interaction effects in single-layer and multi-layer transition metal dichalcogenides,"One of the main characteristics of the new family of two-dimensional crystals
+of semiconducting transition metal dichalcogenides (TMD) is the strong
+spin-orbit interaction, which makes them very promising for future applications
+in spintronics and valleytronics devices. Here we present a detailed study of
+the effect of spin-orbit coupling (SOC) on the band structure of single-layer
+and bulk TMDs, including explicitly the role of the chalcogen orbitals and
+their hybridization with the transition metal atoms. To this aim, we combine
+density functional theory (DFT) calculations with a Slater-Koster tight-binding
+model. Whereas most of the previous tight-binding models have been restricted
+to the K and K' points of the Brillouin zone (BZ), here we consider the effect
+of SOC in the whole BZ, and the results are compared to the band structure
+obtained by DFT methods. The tight-binding model is used to analyze the effect
+of SOC in the band structure, considering separately the contributions from the
+transition metal and the chalcogen atoms. Finally, we present a scenario where,
+in the case of strong SOC, the spin/orbital/valley entanglement at the minimum
+of the conduction band at Q can be probed and be of experimental interest in
+the most common cases of electron-doping reported for this family of compounds.",1401.5009v2
+2015-09-23,Tilting Saturn without tilting Jupiter: Constraints on giant planet migration,"The migration and encounter histories of the giant planets in our Solar
+System can be constrained by the obliquities of Jupiter and Saturn. We have
+performed secular simulations with imposed migration and N-body simulations
+with planetesimals to study the expected obliquity distribution of migrating
+planets with initial conditions resembling those of the smooth migration model,
+the resonant Nice model and two models with five giant planets initially in
+resonance (one compact and one loose configuration). For smooth migration, the
+secular spin-orbit resonance mechanism can tilt Saturn's spin axis to the
+current obliquity if the product of the migration time scale and the orbital
+inclinations is sufficiently large (exceeding 30 Myr deg). For the resonant
+Nice model with imposed migration, it is difficult to reproduce today's
+obliquity values, because the compactness of the initial system raises the
+frequency that tilts Saturn above the spin precession frequency of Jupiter,
+causing a Jupiter spin-orbit resonance crossing. Migration time scales
+sufficiently long to tilt Saturn generally suffice to tilt Jupiter more than is
+observed. The full N-body simulations tell a somewhat different story, with
+Jupiter generally being tilted as often as Saturn, but on average having a
+higher obliquity. The main obstacle is the final orbital spacing of the giant
+planets, coupled with the tail of Neptune's migration. The resonant Nice case
+is barely able to simultaneously reproduce the {orbital and spin} properties of
+the giant planets, with a probability ~0.15%. The loose five planet model is
+unable to match all our constraints (probability <0.08%). The compact five
+planet model has the highest chance of matching the orbital and obliquity
+constraints simultaneously (probability ~0.3%).",1509.06834v1
+2018-08-16,Pressure-induced collapse of spin-orbital Mott state in the hyperhoneycomb iridate $β$-Li$_2$IrO$_3$,"Hyperhoneycomb iridate $\beta$-Li$_2$IrO$_3$ is a three-dimensional analogue
+of two-dimensional honeycomb iridates, such as $\alpha$-Li$_2$IrO$_3$, which
+recently appeared as another playground for the physics of Kitaev-type spin
+liquid. $\beta$-Li$_2$IrO$_3$ shows a non-collinear spiral ordering of
+spin-orbital-entangled $J_{\rm eff}$ = 1/2 moments at low temperature, which is
+known to be suppressed under a pressure of $\sim$2 GPa. With further increase
+of pressure, a structural transition is observed at $P_{\rm S}$ $\sim$ 4 GPa at
+room temperature. Using the neutron powder diffraction technique, the crystal
+structure in the high-pressure phase of $\beta$-Li$_2$IrO$_3$ above $P_{\rm S}$
+was refined, which indicates the formation of Ir$_2$ dimers on the zig-zag
+chains, with the Ir-Ir distance even shorter than that of metallic Ir. We argue
+that the strong dimerization stabilizes the bonding molecular orbital state
+comprising the two local $d_{zx}$-orbitals on the Ir-O$_2$-Ir bond plane, which
+conflicts with the equal superposition of $d_{xy}$-, $d_{yz}$- and $d_{zx}$-
+orbitals in the $J_{\rm eff}$ = 1/2 wave function produced by strong spin-orbit
+coupling. The results of resonant inelastic x-ray scattering (RIXS)
+measurements and the electronic structure calculations are fully consistent
+with the collapse of the $J_{\rm eff}$ = 1/2 state. A subtle competition of
+various electronic phases is universal in honeycomb-based Kitaev materials.",1808.05494v1
+2022-08-26,Quasiparticle characteristics of the weakly ferromagnetic Hund's metal MnSi,"Hund's metals are multi-orbital systems with $3d$ or $4d$ electrons
+exhibiting both itinerant character and local moments, and they feature
+Kondo-like screenings of local orbital and spin moments, with suppressed
+coherence temperature driven by Hund's coupling $J_H$. They often exhibit
+magnetic order at low temperature, but how the interaction between the
+Kondo-like screening and long-range magnetic order is manifested in the
+quasiparticle spectrum remains an open question. Here we present spectroscopic
+signature of such interaction in a Hund's metal candidate MnSi exhibiting weak
+ferromagnetism. Our photoemission measurements reveal renormalized
+quasiparticle bands near the Fermi level with strong momentum dependence: the
+ferromagnetism manifests through possibly exchange-split bands (Q1) below $T_C$
+, while the spin/orbital screenings lead to gradual development of
+quasiparticles (Q2) upon cooling. Our results demonstrate how the
+characteristic spin/orbital coherence in a Hund's metal could coexist and
+compete with the magnetic order to form a weak itinerant ferromagnet, via
+quasiparticle bands that are well separated in momentum space and exhibit
+distinct temperature dependence. Our results imply that the competition between
+the spin/orbital screening and the magnetic order in a Hund's metal bears
+intriguing similarity to the Kondo lattice systems.",2208.12456v2
+2023-04-20,Contrasting electronic states of RuI3 and RuCl3,"The spin-orbital entangled states are of great interest as they hold exotic
+phases and intriguing properties. Here we use first-principles calculations to
+investigate the electronic and magnetic properties of RuI$_{3}$ and RuCl$_{3}$
+in both bulk and monolayer cases. Our results show that RuI$_{3}$ bulk is a
+paramagnetic metal, which is in agreement with recent experiments. We find that
+the Ru$^{3+}$ ion of RuI$_{3}$ is in the spin-orbital entangled $j_{\rm
+eff}=\frac{1}{2}$ state. More interestingly, a metal-insulator transition
+occurs from RuI$_{3}$ bulk to monolayer, and this is mainly due to the band
+narrowing with the decreasing lattice dimensionality and to the Ru-I
+hybridization altered by the I $5p$ spin-orbit coupling. In contrast,
+RuCl$_{3}$ bulk and monolayer both show Mott-insulating behavior, the Ru$^{3+}$
+ion is in the formal $S=\frac{1}{2}$ and $L=1$ state with a large in-plane
+orbital moment, and this result well explains the experimental large effective
+magnetic moment of RuCl$_{3}$ and the strong in-plane magnetization. The
+present work demonstrates the contrasting spin-orbital states and the varying
+properties of RuI$_{3}$ and RuCl$_{3}$.",2304.10090v1
+2017-06-12,Optical Signatures of Spin-Orbit Exciton in Bandwidth Controlled Sr$_2$IrO$_4$ Epitaxial Films via High-Concentration Ca and Ba Doping,"We have investigated the electronic and optical properties of
+(Sr$_{1-x}$Ca$_{x}$)$_2$IrO$_4$ (x= 0 - 0.375) and
+(Sr$_{1-y}$Ba$_y$)$_2$IrO$_4$ (y= 0 - 0.375) epitaxial thin-films, in which the
+bandwidth is systematically tuned via chemical substitutions of Sr ions by Ca
+and Ba. Transport measurements indicate that the thin-film series exhibits
+insulating behavior, similar to the J$_{eff}$= 1/2 spin-orbit Mott insulator
+Sr$_2$IrO$_4$. As the average A-site ionic radius increases from
+(Sr$_{1-x}$Ca$_{x}$)$_2$IrO$_4$ to (Sr$_{1-y}$Ba$_y$)$_2$IrO$_4$, optical
+conductivity spectra in the near-infrared region shift to lower energies, which
+cannot be explained by the simple picture of well-separated J$_{eff}$= 1/2 and
+J$_{eff}$= 3/2 bands. We suggest that the two-peak-like optical conductivity
+spectra of the layered iridates originates from the overlap between the
+optically-forbidden spin-orbit exciton and the inter-site optical transitions
+within the J$_{eff}$= 1/2 band. Our experimental results are consistent with
+this interpretation as implemented by a multi-orbital Hubbard model
+calculation: namely, incorporating a strong Fano-like coupling between the
+spin-orbit exciton and inter-site d-d transitions within the J$_{eff}$= 1/2
+band.",1706.03529v1
+1999-10-07,Meson-like Baryons and the Spin-Orbit Puzzle,"I describe a special class of meson-like \Lambda_Q excited states and present
+evidence supporting the similarity of their spin-independent spectra to those
+of mesons. I then examine spin-dependent forces in these baryons, showing that
+predicted effects of spin-orbit forces are small for them for the same reason
+they are small for the analogous mesons: a fortuitous cancellation between
+large spin-orbit forces due to one-gluon-exchange and equally large inverted
+spin-orbit forces due to Thomas precession in the confining potential. In
+addition to eliminating the baryon spin-orbit puzzle in these states, this
+solution provides a new perspective on spin-orbit forces in all baryons.",9910272v1
+2001-02-13,Magnetic and Orbital States and Their Phase Transition of the Perovskite-Type Ti Oxides: Strong Coupling Approach,"The properties and mechanism of the magnetic phase transition of the
+perovskite-type Ti oxides, which is driven by the Ti-O-Ti bond angle
+distortion, are studied theoretically by using the effective spin and
+pseudospin Hamiltonian with strong Coulomb repulsion. It is shown that the
+A-type antiferromagnetic (AFM(A)) to ferromagnetic (FM) phase transition occurs
+as the Ti-O-Ti bond angle is decreased. Through this phase transition, the
+orbital state changes only little whereas the spin-exchange coupling along the
+c-axis is expected to change from positive to negative nearly continuously and
+approaches zero at the phase boundary. The resultant strong two-dimensionality
+in the spin coupling causes rapid suppression of the critical temperature, as
+observed experimentally. It may induce large quantum fluctuations in this
+region.",0102223v1
+2009-06-15,Effect of the spin-orbit interaction and the electron phonon coupling on the electronic state in a silicon vacancy,"The electronic state around a single vacancy in silicon crystal is
+investigated by using the Green's function approach. The triply degenerate
+charge states are found to be widely extended and account for extremely large
+elastic softening at low temperature as observed in recent ultrasonic
+experiments. When we include the LS coupling $\lambda_{\rm Si}$ on each Si
+atom, the 6-fold spin-orbital degeneracy for the $V^{+}$ state with the valence
++1 and spin 1/2 splits into $\Gamma_{7}$ doublet groundstates and $\Gamma_{8}$
+quartet excited states with a reduced excited energy of $O(\lambda_{\rm
+Si}/10)$. We also consider the effect of couplings between electrons and
+Jahn-Teller phonons in the dangling bonds within the second order perturbation
+and find that the groundstate becomes $\Gamma_{8}$ quartet which is responsible
+for the magnetic-field suppression of the softening in B-doped silicon.",0906.2596v2
+2014-08-26,Ferromagnetic and Nematic Non-Fermi Liquids in Spin-Orbit Coupled Two-Dimensional Fermi Gases,"We study the fate of a two-dimensional system of interacting fermions with
+Rashba spin-orbit coupling in the dilute limit. The interactions are strongly
+renormalized at low densities, and give rise to various fermionic liquid
+crystalline phases, including a spin-density wave, an in-plane ferromagnet, and
+a non-magnetic nematic phase, even in the weak coupling limit. The nature of
+the ground state in the low-density limit depends on the range of the
+interactions: for short range interactions it is the ferromagnet, while for
+dipolar interactions the nematic phase is favored. Interestingly, the
+ferromagnetic and nematic phases exhibit strong deviations from Fermi liquid
+theory, due to the scattering of the Fermionic quasi-particles off
+long-wavelength collective modes. Thus, we argue that a system of interacting
+fermions with Rashba dispersion is generically a non-Fermi liquid at low
+densities.",1408.6250v3
+2017-03-29,Magnon dispersion in Ca2RuO4: impact of spin-orbit coupling and oxygen moments,"The magnon dispersion of Ca$_2$RuO$_4$ has been studied by polarized and
+unpolarized neutron scattering experiments on crystals containing 0, 1 and 10 %
+of Ti. The entire dispersion of transverse magnons can be well described by a
+conventional spin-wave model with interaction and anisotropy parameters that
+agree with density functional theory calculations. Spin-orbit coupling strongly
+influences the magnetic excitations, which is most visible in large energies of
+the magnetic zone-center modes arising from magnetic anisotropy. We find
+evidence for a low-lying additional mode that exhibits strongest scattering
+intensity near the antiferromagnetic zone center. This extra signal can be
+explained by a sizable magnetic moment of 0.11 Bohr magnetons on the apical
+oxygens parallel to the Ru moment, which is found in the density functional
+theory calculations. The energy and the signal strength of the additional
+branch are well described by taking into account this oxygen moment with weak
+ferromagnetic coupling between Ru and O moments.",1703.10017v1
+2020-07-08,Supersolid Striped Droplets in a Raman Spin-Orbit-Coupled System,"We analyze the role played by quantum fluctuations on a Raman Spin-Orbit
+Coupled system in the stripe phase. We show that beyond mean-field effects
+stabilize the collapse predicted by mean-field theory and induce the emergence
+of two phases: a gas and a liquid, which also show spatial periodicity along a
+privileged direction. We show that the energetically favored phase is
+determined by the Raman coupling and the spin-dependent scattering lengths. We
+obtain the ground-state solution of the finite system by solving the extended
+Gross-Pitaevskii equation and find self-bound, droplet-like solutions that
+feature internal structure through a striped pattern. We estimate the critical
+number for binding associated to these droplets and show that their value is
+experimentally accessible. We report an approximate energy functional in order
+to ease the evaluation of the Lee-Huang-Yang correction in practical terms.",2007.04196v1
+2020-01-14,Self-bound supersolid stripe phase in binary Bose-Einstein condensates,"Supersolidity - a coexistence of superfluidity and crystalline or amorphous
+density variations - has been vividly debated ever since its conjecture. While
+the initial focus was on helium-4, recent experiments uncovered supersolidity
+in ultra-cold dipolar quantum gases. Here, we propose a new self-bound
+supersolid phase in a binary mixture of Bose gases with short-range
+interactions, making use of the non-trivial properties of spin-orbit coupling.
+We find that a first-order phase transition from a self-bound supersolid stripe
+phase to a zero-minimum droplet state of the Bose gas occurs as a function of
+the Rabi coupling strength. These phases are characterized using the momentum
+distribution, the transverse spin polarization and the superfluid fraction. The
+critical point of the transition is estimated in an analytical framework. The
+predicted density-modulated supersolid stripe and zero-minimum droplet phase
+should be experimentally observable in a binary mixture of $^{39}$K with
+spin-orbit coupling.",2001.04751v1
+2020-01-17,Supersolid Stripes Enhanced by Correlations in a Raman Spin-Orbit-Coupled System,"A Bose gas under the effect of Raman Spin-Orbit Coupling (SOC) is analyzed
+using the Discrete Spin T-moves Diffusion Monte Carlo method. By computing the
+energy as well as the static structure factor and the superfluid fraction of
+the system, the emergence of an energetically favorable supersolid stripe state
+is observed, which is in agreement with recent observations. A significant
+enhancement of the stability of the stripe phase with respect to the mean-field
+prediction is observed when the strength of the inter-atomic correlations is
+increased. We also quantify and characterize the degree of superfluidity of the
+stripes and show that this quantity is mostly determined by the ratio between
+the Raman coupling and the square of the momentum difference between the pair
+of SOC inducing laser beams.",2001.06394v2
+2020-02-12,Spin-orbit coupling in photonic graphene,"We generate experimentally a honeycomb refractive index pattern in an atomic
+vapor cell using electromagnetically-induced transparency. We study
+experimentally and theoretically the propagation of polarized light beams in
+such ""photonic graphene"". We demonstrate that an effective spin-orbit coupling
+appears as a correction to the paraxial beam equations because of the strong
+spatial gradients of the permittivity. It leads to the coupling of spin and
+angular momentum at the Dirac points of the graphene lattice. Our results
+suggest that the polarization degree plays an important role in many
+configurations where it has been previously neglected.",2002.04927v1
+2017-07-16,"Reorientations, relaxations, metastabilities and multidomains of skyrmion lattices","Magnetic skyrmions are nano-sized topologically protected spin textures with
+particle-like properties. They can form lattices perpendicular to the magnetic
+field and the orientation of these skyrmion lattices with respect to the
+crystallographic lattice is governed by spin-orbit coupling. By performing
+small angle neutron scattering measurements, we investigate the coupling
+between the crystallographic and skyrmion lattices in both Cu$_2$OSeO$_3$ and
+the archetype chiral magnet MnSi. The results reveal that the orientation of
+the skyrmion lattice is primarily determined by the magnetic field direction
+with respect to the crystallographic lattice. In addition, it is also
+influenced by the magnetic history of the sample which can induce metastable
+lattices. Kinetic measurements show that these metastable skyrmion lattices may
+or may not relax to their equilibrium positions under macroscopic relaxation
+times. Furthermore, multidomain lattices may form when two or more equivalent
+crystallographic directions are favored by spin-orbit coupling and oriented
+perpendicular to the magnetic field.",1707.04921v2
+2023-07-19,Coupling of the triple-Q state to the atomic lattice by anisotropic symmetric exchange,"We identify the triple-Q (3Q) state as magnetic ground state in Pd/Mn and
+Rh/Mn bilayers on Re(0001) using spin-polarized scanning tunneling microscopy
+and density functional theory. An atomistic model reveals that in general the
+3Q state with tetrahedral magnetic order and zero net spin moment is coupled to
+a hexagonal atomic lattice in a highly symmetric orientation via the
+anisotropic symmetric exchange interaction, whereas other spin-orbit coupling
+terms cancel due to symmetry. Our experiments are in agreement with the
+predicted orientation of the 3Q state. A distortion from the ideal tetrahedral
+angles leads to other orientations of the 3Q state which, however, results in a
+reduced topological orbital magnetization compared to the ideal 3Q state.",2307.09764v1
+2009-03-04,Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling,"We show that singlet-triplet superpositions of two-electron spin states in a
+double quantum dot undergo a phonon-induced pure dephasing which relies only on
+the tunnel coupling between the dots and on the Pauli exclusion principle. As
+such, this dephasing process is independent of spin-orbit coupling or hyperfine
+interactions. The physical mechanism behind the dephasing is elastic phonon
+scattering, which persists to much lower temperatures than real phonon-induced
+transitions. Quantitative calculations performed for a lateral GaAs/AlGaAs
+gate-defined double quantum dot yield micro-second dephasing times at
+sub-Kelvin temperatures, which is consistent with experimental observations.",0903.0783v2
+2011-09-09,Signatures of Rashba spin-orbit interaction in the superconducting proximity effect in helical Luttinger liquids,"We consider the superconducting proximity effect in a helical Luttinger
+liquid at the edge of a 2D topological insulator, and derive the low-energy
+Hamiltonian for an edge state tunnel-coupled to a s-wave superconductor. In
+addition to correlations between the left and right moving modes, the coupling
+can induce them inside a single mode, as the spin axis of the edge modes is not
+necessarily constant. This can be induced controllably in HgTe/CdTe quantum
+wells via the Rashba spin-orbit coupling, and is a consequence of the 2D nature
+of the edge state wave function. The distinction of these two features in the
+proximity effect is also vital for the use of such helical modes in order to
+split Cooper-pairs. We discuss the consequent transport signatures, and point
+out a long-ranged feature in a dc conductance measurement that can be used to
+distinguish the two types of correlations present and to determine the
+magnitude of the Rashba interaction.",1109.2097v2
+2013-03-27,Superstripes and the excitation spectrum of a spin-orbit-coupled Bose-Einstein condensate,"Using Bogoliubov theory we calculate the excitation spectrum of a spinor
+Bose-Einstein condensed gas with equal Rashba and Dresselhaus spin-orbit
+coupling in the stripe phase. The emergence of a double gapless band structure
+is pointed out as a key signature of Bose-Einstein condensation and of the
+spontaneous breaking of translational invariance symmetry. In the long
+wavelength limit the lower and upper branches exhibit, respectively, a clear
+spin and density nature. For wave vectors close to the first Brillouin zone,
+the lower branch acquires an important density character responsible for the
+divergent behavior of the structure factor and of the static response function,
+reflecting the occurrence of crystalline order. The sound velocities are
+calculated as functions of the Raman coupling for excitations propagating
+orthogonal and parallel to the stripes. Our predictions provide new
+perspectives for the identification of supersolid phenomena in ultracold atomic
+gases.",1303.6903v2
+2013-06-26,Finite-temperature conductance of weakly interacting quantum wires with Rashba spin-orbit coupling,"We calculate the finite-temperature conductance of clean, weakly interacting
+one-dimensional quantum wires subject to Rashba spin-orbit coupling and a
+magnetic field. For chemical potentials near the center of the Zeeman gap ($\mu
+= 0$), two-particle scattering causes the leading deviation from the quantized
+conductance at finite temperatures. On the other hand, for $|\mu| > 0$,
+three-particle scattering processes become more relevant. These deviations are
+a consequence of the strongly nonlinear single-particle spectrum, and are thus
+not accessible using Luttinger liquid theory. We discuss the observability of
+these predictions in current experiments on InSb nanowires and in ""spiral
+liquids"", where a spontaneous ordering of the nuclear spins at low temperatures
+produces an effective Rashba coupling.",1306.6218v3
+2014-02-25,Signatures of the Helical Phase in the Critical Fields at Twin Boundaries of Non-Centrosymmetric Superconductors,"Domains in non-centrosymmetric materials represent regions of different
+crystal structure and spin-orbit coupling. Twin boundaries separating such
+domains display unusual properties in non-centrosymmetric superconductors
+(NCS), where magneto-electric effects influence the local lower and upper
+critical magnetic fields. As a model system, we investigate NCS with tetragonal
+crystal structure and Rashba spin-orbit coupling (RSOC), and with twin
+boundaries parallel to their basal planes. There, we report that there are two
+types of such twin boundaries which separate domains of opposite RSOC. In a
+magnetic field parallel to the basal plane, magneto-electric coupling between
+the spin polarization and supercurrents induces an effective magnetic field at
+these twin boundaries. We show this leads to unusual effects in such
+superconductors, and in particular to the modification of the upper and lower
+critical fields, in ways that depend on the type of twin boundary, as analyzed
+in detail, both analytically and numerically. Experimental implications of
+these effects are discussed.",1402.6027v1
+2015-04-28,"Multicriticality, Metastability, and Roton Feature in Bose-Einstein Condensates with Three-Dimensional Spin-Orbit Coupling","We theoretically study homogeneously trapped atomic Bose-Einstein condensates
+where all three momentum components couple to a pseudo-spin-$1/2$ degree of
+freedom. Tuning the anisotropies of spin-orbit coupling and the spin-dependent
+interactions is shown to provide access to a rich phase diagram with a
+tetracritical point, first-order phase transitions, and multiple metastable
+phases of stripe and plane-wave character. The elementary excitation spectrum
+of the axial plane-wave phase features an anisotropic roton feature and can be
+used to probe the phase diagram. In addition to providing a versatile
+laboratory for studying fundamental concepts in statistical physics, the
+emergence of metastable phases creates new opportunities for observing
+false-vacuum decay and bubble nucleation in ultra-cold-atom experiments.",1504.07370v1
+2015-11-18,Spin-orbit torque switching without external field with a ferromagnetic exchange-biased coupling layer,"Magnetization reversal of a perpendicular ferromagnetic free layer by
+spin-orbit torque (SOT) is an attractive alternative to spin-transfer torque
+(STT) switching in magnetic random-access memory (MRAM) where the write process
+involves passing a high current across an ultrathin tunnel barrier. A small
+symmetry-breaking bias field is usually needed for deterministic SOT switching
+but it is impractical to generate the field externally for spintronic
+applications. Here, we demonstrate robust zero-field SOT switching of a
+perpendicular Co90Fe10 (CoFe) free layer where the symmetry is broken by
+magnetic coupling to a second in-plane exchange-biased CoFe layer via a
+nonmagnetic Ru spacer. The preferred magnetic state of the free layer is
+determined by the current polarity and the nature of the interlayer exchange
+coupling (IEC). Our strategy offers a scalable solution to realize
+bias-field-free SOT switching that can lead to a generation of SOT-based
+devices, that combine high storage density and endurance with potentially low
+power consumption.",1511.05773v1
+2015-11-26,Experimental observation of a topological band gap opening in ultracold Fermi gases with two-dimensional spin-orbit coupling,"The recent experimental realization of synthetic spin-orbit coupling (SOC)
+opens a new avenue for exploring novel quantum states with ultracold atoms.
+However, in experiments for generating two-dimensional SOC (e.g., Rashba type),
+a perpendicular Zeeman field, which opens a band gap at the Dirac point and
+induces many topological phenomena, is still lacking. Here we theoretically
+propose and experimentally realize a simple scheme for generating two-dimension
+SOC and a perpendicular Zeeman field simultaneously in ultracold Fermi gases by
+tuning the polarization of three Raman lasers that couple three hyperfine
+ground states of atoms. The resulting band gap opening at the Dirac point is
+probed using spin injection radio-frequency spectroscopy. Our observation may
+pave the way for exploring topological transport and topological superfluids
+with exotic Majorana and Weyl fermion excitations in ultracold atoms.",1511.08492v2
+2016-01-28,Two Dimensional Antiferromagnetic Chern Insulator NiRuCl6,"Based on DFT and Berry curvature calculations, we predict that quantum
+anomalous hall effect (QAHE) can be realized in two dimensional
+anti-ferromagnetic (AFM) NiRuCl6 with zero net magnetic moment. By tuning
+spin-orbits coupling (SOC), we find that the topological properties of NiRuCl6
+come from its energy band reversal. The results indicate that NiRuCl6 behaves
+as AFM Chern insulator and its spin-polarized electronic structure and strong
+spin-orbits coupling (SOC) are the origin of QAHE. Considering the
+compatibility between AFM and insulator, AFM Chern insulator is more suitable
+to realize high temperature QAHE because generally Neel temperature of AFM
+systems is more easily improved than Curie temperature of ferromagnetic (FM)
+systems. Due to the different magnetic coupling mechanism between FM and AFM
+Chern insulator, AFM Chern insulator provides a new way to archive high
+temperature QAHE in experiments.",1601.07705v2
+2019-09-29,Quantum phases and collective excitations of a spin-orbit-coupled Bose-Einstein condensate in a one-dimensional optical lattice,"The ground state of a spin-orbit-coupled Bose gas in a one-dimensional
+optical lattice is known to exhibit a mixed regime, where the condensate wave
+function is given by a superposition of multiple Bloch-wave components, and an
+unmixed one, in which the atoms occupy a single Bloch state. The unmixed regime
+features two unpolarized Bloch-wave phases, having quasimomentum at the center
+or at the edge of the first Brillouin zone, and a polarized Bloch-wave phase at
+intermediate quasimomenta. By calculating the critical values of the Raman
+coupling and of the lattice strength at the transitions among the various
+phases, we show the existence of a tricritical point where the mixed, the
+polarized and the edge-quasimomentum phases meet, and whose appearance is a
+consequence of the spin-dependent interaction. Furthermore, we evaluate the
+excitation spectrum in the unmixed regime and we characterize the behavior of
+the phonon and the roton modes, pointing out the instabilities occurring when a
+phase transition is approached.",1909.13317v1
+2020-02-14,Multi-channel scattering mechanism behind the re-entrant conductance feature in nanowires subject to strong spin-orbit coupling,"The characterization of helical states can be performed by checking the
+existence of the re-entrant behaviour, which appears as a dip in the
+conductance probed in nanowires (NWs) with strong spin-orbit coupling (SOC) and
+under perpendicular magnetic field. On the other hand, the experiment described
+in Ref. 1 observed the re-entrant behaviour in the absence of a magnetic field,
+which was explained through spin-flipping two-particle backscattering. We
+theoretically show that the observation of the re-entrant behaviour is due to a
+multi-channel scattering mechanism, which causes a reduction of the
+transmission when an effective attractive potential and coupling between
+different channels are present. Both ingredients are provided by the SOC in the
+transport properties of NWs.",2002.06046v1
+2020-04-03,Quantum Anomalous Hall Effects in Graphene from Proximity-Induced Uniform and Staggered Spin-Orbit and Exchange Coupling,"We investigate an effective model of proximity modified graphene (or
+symmetrylike materials) with broken time-reversal symmetry. We predict the
+appearance of quantum anomalous Hall phases by computing bulk band gap and
+Chern numbers for benchmark combinations of system parameters. Allowing for
+staggered exchange field enables quantum anomalous Hall effect in flat graphene
+with Chern number $C=1$. We explicitly show edge states in zigzag and armchair
+nanoribbons and explore their localization behavior. Remarkably, the
+combination of staggered intrinsic spin-orbit and uniform exchange coupling
+gives topologically protected (unlike in time-reversal systems) pseudohelical
+states, whose spin is opposite in opposite zigzag edges. Rotating the
+magnetization from out of plane to in plane makes the system trivial, allowing
+to control topological phase transitions. We also propose, using density
+functional theory, a material platform---graphene on Ising antiferromagnet
+MnPSe$_3$---to realize staggered exchange (pseudospin Zeeman) coupling.",2004.01760v1
+2017-05-18,Strong coupling phases of the spin-orbit-coupled spin-1 Bose-Hubbard chain: odd integer Mott lobes and helical magnetic phases,"We study the odd integer filled Mott phases of a spin-1 Bose-Hubbard chain
+and determine their fate in the presence of a Raman induced spin-orbit coupling
+which has been achieved in ultracold atomic gases; this system is described by
+a quantum spin-1 chain with a spiral magnetic field. The spiral magnetic field
+initially induces helical order with either ferromagnetic or dimer order
+parameters, giving rise to a spiral paramagnet at large field. The spiral
+ferromagnet-to-paramagnet phase transition is in a novel universality class,
+with critical exponents associated with the divergence of the correlation
+length $\nu \approx 2/3$ and the order parameter susceptibility $\gamma \approx
+1/2$. We solve the effective spin model exactly using the density matrix
+renormalization group, and compare with both a large-$S$ classical solution and
+a phenomenological Landau theory. We discuss how these exotic bosonic magnetic
+phases can be produced and probed in ultracold atomic experiments in optical
+lattices.",1705.06742v2
+2019-01-28,Chern insulator in a ferromagnetic two-dimensional electron system with Dresselhaus spin-orbit coupling,"We propose a Chern insulator in a two-dimensional electron system with
+Dresselhaus spin-orbit coupling, ferromagnetism, and spin-dependent effective
+mass. The analytically-obtained topological phase diagrams show the topological
+phase transitions induced by tuning the magnetization orientation with the
+Chern number varying between $1,0,-1$. The magnetization orientation tuning
+shown here is a more practical way of triggering the topological phase
+transitions than manipulating the exchange coupling that is no longer tunable
+after the fabrication of the system. The analytic results are confirmed by the
+band structure and transport calculations, showing the feasibility of this
+theoretical proposal. With the advanced and mature semiconductor engineering
+today, this Chern insulator is very possible to be experimentally realized and
+also promising to topological spintronics.",1901.09536v3
+2021-04-21,Revealing hidden magneto-electric multipoles using Compton scattering,"Magneto-electric multipoles, which are odd under both space-inversion $\cal
+I$ and time-reversal $\cal T$ symmetries, are fundamental in understanding and
+characterizing magneto-electric materials. However, the detection of these
+magneto-electric multipoles is often not straightforward as they remain
+""hidden"" in conventional experiments in part since many magneto-electrics
+exhibit combined $\cal IT$ symmetry. In the present work, we show that the
+anti-symmetric Compton profile is a unique signature for all the
+magneto-electric multipoles, since the asymmetric magnetization density of the
+magneto-electric multipoles couples to space via spin-orbit coupling, resulting
+in an anti-symmetric Compton profile. We develop the key physics of the
+anti-symmetric Compton scattering using symmetry analysis and demonstrate it
+using explicit first-principles calculations for two well-known representative
+materials with magneto-electric multipoles, insulating LiNiPO$_4$ and metallic
+Mn$_2$Au. Our work emphasizes the crucial roles of the orientation of the spin
+moments, the spin-orbit coupling, and the band structure in generating the
+anti-symmetric Compton profile in magneto-electric materials.",2104.10484v1
+2017-11-20,Exposing the quantum geometry of spin-orbit coupled Fermi superfluids,"The coupling between a quantum particle's intrinsic angular momentum and its
+center-of-mass motion gives rise to the so-called helicity states that are
+characterized by the projection of the spin onto the direction of momentum. In
+this paper, by unfolding the superfluid-density tensor into its intra-helicity
+and inter-helicity components, we reveal that the latter contribution is
+directly linked with the total quantum metric of the helicity bands. We
+consider both Rashba and Weyl spin-orbit couplings across the BCS-BEC
+crossover, and show that the geometrical inter-helicity contribution is
+responsible for up to a quarter of the total superfluid density. We believe
+this is one of those elusive effects that may be measured within the
+highly-tunable realm of cold Fermi gases.",1711.07262v2
+2021-09-15,The Dirac paradox in 1+1 dimensions and its realization with spin-orbit coupled nanowires,"At the interface between two massless Dirac models with opposite helicity a
+paradoxical situation arises: A transversally impinging electron can seemingly
+neither be transmitted nor reflected, due to the locking between spin and
+momentum. Here we investigate this paradox in one spatial dimension where,
+differently from higher dimensional realizations, electrons cannot leak along
+the interface. We show that models involving only massless Dirac modes lead to
+either no solutions or to trivial solutions to the paradox, depending on how
+the helicity change across the interface is modeled. However, non trivial
+scattering solutions to the paradox are shown to exist when additional massive
+Dirac modes are taken into account. Although these modes carry no current for
+energies within their gap, their interface coupling with the massless modes can
+induce a finite and tunable transmission. Finally, we show that such
+massless+massive Dirac model can be realized in suitably gated spin-orbit
+coupled nanowires exposed to an external Zeeman field, where the transmission
+coefficient can be controlled electrically.",2109.07355v2
+2022-07-19,Topological Superconductivity From Forward Phonon Scatterings,"We propose a new Rashba-free mechanism to realize topological
+superconductivity with electron-phonon interaction. In the presence of a
+magnetic field, electron-phonon interaction with small momentum transfer is
+found to favor spin-triplet Cooper pairing. This process facilitates the
+formation of chiral topological superconductivity even when Rashba spin-orbital
+coupling is absent. As a proof of concept, we propose an experimentally
+feasible heterostructure to systematically study the entangled relationship
+among forward-phonon scatterings, Rashba spin-orbital couplings, pairing
+symmetries, and superconducting topology. Our theory sheds light on the
+important role of electron-phonon coupled materials in the pursuit of
+non-Abelian Majorana quasiparticles.",2207.09443v2
+2023-01-13,Exceptional degeneracies in non-Hermitian Rashba semiconductors,"Exceptional points are spectral degeneracies of non-Hermitian systems where
+eigenvalues and eigenvectors coalesce, inducing unique topological phases that
+have no counterpart in the Hermitian realm. Here we consider a non-Hermitian
+system by coupling a two-dimensional semiconductor with Rashba spin-orbit
+coupling to a ferromagnet lead and show the emergence of highly tunable
+exceptional points along rings in momentum space. Interestingly, these
+exceptional degeneracies are the endpoints of lines formed by the eigenvalue
+coalescence at finite real energy, resembling the bulk Fermi arcs commonly
+defined at zero real energy. We then show that an in-plane Zeeman field
+provides a way to control these exceptional degeneracies although higher values
+of non-Hermiticity are required in contrast to the zero Zeeman field regime.
+Furthermore, we find that the spin projections also coalescence at the
+exceptional degeneracies and can acquire larger values than in the Hermitian
+regime. Finally, we demonstrate that the exceptional degeneracies induce large
+spectral weights, which can be used as a signature for their detection. Our
+results thus reveal the potential of systems with Rashba spin-orbit coupling
+for realizing non-Hermitian bulk phenomena.",2301.05337v3
+2023-11-28,Linear and Angular Momentum Conservation in Surface Hopping Methods,"We demonstrate that, for systems with spin-orbit coupling and an odd number
+of electrons, the standard fewest switches surface hopping (FSSH) algorithm
+does not conserve the total linear or angular momentum. This lack of
+conservation arises not so much from the hopping direction (which is easily
+adjusted) but more generally from propagating adiabatic dynamics along surfaces
+that are not time reversible. We show that one solution to this problem is to
+run along eigenvalues of phase-space electronic Hamiltonians $H(R,P)$ (i.e.
+electronic Hamiltonians that depend on both nuclear position and momentum) with
+an electronic nuclear coupling $\Gamma\cdot P$ and we delineate the conditions
+that must be satisfied by the operator $\Gamma$. The present results should be
+extremely useful as far as developing new semiclassical approaches that can
+treat systems where the nuclear, electronic orbital, and electronic spin
+degrees of freedom altogether are all coupled together, hopefully including
+systems displaying the chiral induced spin selectivity (CISS) effect.",2311.16976v1
+1999-07-14,Late evolution of cataclysmic variables: the loss of AM Her systems,"The white dwarf in AM Her systems is strongly magnetic and keeps in
+synchronous rotation with the orbit by magnetic coupling to the secondary star.
+As the latter evolves through mass loss to a cool, degenerate brown dwarf it
+can no longer sustain its own magnetic field and coupling is lost. Angular
+momentum accreted then spins up the white dwarf and the system no longer
+appears as an AM Her system. Possible consequences are run-away mass transfer
+and mass ejection from the system. Some of the unusual cataclysmic variable
+systems at low orbital periods may be the outcome of this evolution.",9907190v1
+2005-02-23,Entangled microwave photons from quantum dots,"We describe a mechanism for the production of polarisation-entangled
+microwaves using intra-band transitions in a pair of quantum dots. This
+proposal relies neither on spin-orbit coupling nor on control over
+electron-electron interactions. The quantum correlation of microwave
+polarisations is obtained from orbital degrees of freedom in an external
+magnetic field. We calculate the concurrence of emitted microwave photon pairs,
+and show that a maximally entangled Bell pair is obtained in the limit of weak
+inter-dot coupling.",0502550v2
+2014-07-31,Electronic structure of non-centrosymmetric superconductors Re24(Nb;Ti)5 by ab initio calculations,"Electronic structures of superconducting Re24Nb5 and Re24Ti5 have been
+calculated employing the full-potential local-orbital method within the density
+functional theory. The investigations were focused on the influence of the
+antisymmetric spin-orbit coupling on band structures and Fermi surfaces of
+these non-centrosymmetric systems. The predicted here density of states at the
+Fermi level for Re24Ti5 is abnormally low with respect to that deduced from
+previous heat capacity measurements. This discrepancy suggests an intermediate
+coupled superconducting state in Re24Ti5. The differences between electronic
+properties of both compounds could explain more robust superconductivity in the
+Nb-based material.",1407.8416v1
+2020-01-17,Thermal spin transport and spin in thermoelectrics,"This article reviews the principles that govern the combined transport of
+spin, heat, and charge. The extensive thermodynamic quantity associated with
+spin transport is the magnetization; its Onsager-conjugate force is in general
+the derivative of the free energy with respect to the magnetization. Spins are
+carried in one of two ways: (1) by spin-polarized free electrons in magnetic
+metals and doped semiconductors, or (2) by spin waves (magnons) that reside on
+localized electrons on unfilled d- or f-shells of transition metal or
+rare-earth elements. The paper covers both cases in separate chapters. In both
+cases, it is possible to define a spin chemical potential whose gradient is the
+more practical conjugate force to spin transport. The paper further describes
+the anomalous Hall, spin Hall, and inverse spin Hall effects in magnetic and
+non-magnetic solids with strong spin-orbit coupling because these effects are
+used to generate and measure spin fluxes. Spin transport across interfaces is
+described next, and includes spin pumping and spin transfer torque. The final
+chapter then puts all these concepts together to describe the spin-Seebeck,
+spin-Peltier, and magnon-drag effects, which exist in ferromagnetic,
+antiferromagnetic, and even paramagnetic solids. Magnon-drag, in particular, is
+a high-temperature effect that boosts the thermopower of metals by an order of
+magnitude and that of semiconductors by a factor of 2 or 3 above the electronic
+diffusion thermopower. This is the only example where a spin-driven effect is
+larger than a charge-driven effect. Magnon drag leads a simple binary
+paramagnetic semiconductor, MnTe, to have zT > 1 without optimization. This
+shows how adding spin as an additional design parameter in thermoelectrics
+research is a new and promising approach toward the quest for high-zT
+materials.",2001.06366v1
+2005-08-12,Spin relaxation rates in quasi-one-dimensional coupled quantum dots,"We study theoretically the spin relaxation rate in quasi-one-dimensional
+coupled double semiconductor quantum dots. We consider InSb and GaAs-based
+systems in the presence of the Rashba spin-orbit interaction, which causes
+mixing of opposite-spin states, and allows phonon-mediated transitions between
+energy eigenstates. Contributions from all phonon modes and coupling mechanisms
+in zincblende semiconductors are taken into account. The spin relaxation rate
+is shown to display a sharp, cusp-like maximum as function of the
+interdot-barrier width, at a value of the width which can be controlled by an
+external magnetic field. This remarkable behavior is associated with the
+symmetric-antisymmetric level splitting in the structure.",0508303v1
+2005-09-15,Cotunneling current through quantum dots with phonon-assisted spin-flip processes,"We consider cotunneling through a quantum dot in the presence of spin-flip
+processes induced by the coupling to acoustic phonons of the surrounding. An
+expression for the phonon-assisted cotunneling current is derived by means of a
+generalized Schrieffer-Wolff transformation. The influence of the spin-phonon
+coupling on the heating of the dot is considered. The result is evaluated for
+the case of a parabolic semiconductor quantum dot with Rashba and Dresselhaus
+spin-orbit coupling and a method for the determination of the spin-phonon
+relaxation rate is proposed.",0509420v2
+2006-06-01,Spin-Hall Conductivity in Electron-Phonon Coupled Systems,"We derive the ac spin-Hall conductivity $\sigma_{\rm sH}(\omega)$ of
+two-dimensional spin-orbit coupled systems interacting with dispersionless
+phonons of frequency $\omega_0$. For the linear Rashba model we show that the
+electron-phonon contribution to the spin-vertex corrections breaks the
+universality of $\sigma_{\rm sH}(\omega)$ at low-frequencies and provides a
+non-trivial renormalization of the interband resonance. On the contrary, in a
+generalized Rashba model for which the spin-vertex contributions are absent,
+the coupling to the phonons enters only through the self-energy, leaving the
+low frequency behavior of $\sigma_{\rm sH}(\omega)$ unaffected by the
+electron-phonon interaction.",0606035v2
+2011-10-21,Partially disordered state and spin-lattice coupling in an S=3/2 triangular lattice antiferromagnet Ag2CrO2,"Ag2CrO2 is an S=3/2 frustrated triangular lattice antiferromagnet without
+orbital degree of freedom. With decreasing temperature, a 4-sublatice spin
+state develops. However, a long-range partially disordered state with 5
+sublattices abruptly appears at TN=24 K, accompanied by a structural
+distortion, and persists at least down to 2 K. The spin-lattice coupling
+stabilizes the anomalous state, which is expected to appear only in limited
+ranges of further-neighbor interactions and temperature. It was found that the
+spin-lattice coupling is a common feature in triangular lattice
+antiferromagnets with multiple-sublattice spin states, since the triangular
+lattice is elastic.",1110.4822v2
+2013-06-05,Theory of a chiral Fermi liquid: general formalism,"We extend the Fermi-liquid (FL) theory to include spin-orbit (SO) splitting
+of the energy bands, focusing on the Rashba SO coupling as an example. We
+construct the phenomenological Landau interaction function for such a system
+using the symmetry arguments and verify this construction by an explicit
+perturbative calculation. The Landau function is used to obtain the effective
+mass, compressibility, and stability conditions of the FL. It is shown that
+although the charge-sector properties, such as the effective mass and
+compressibility, are determined solely by well-defined quasiparticles, the
+spin-sector properties, such as the spin susceptibility, contain a contribution
+from damped states in between the spin-split Fermi surfaces, and thus cannot be
+fully described by the FL theory, except for the case of weak SO coupling. We
+derive some specific properties of a chiral FL and show, in particular, that
+for contact interaction spin-splitting of the Fermi velocities of Rashba
+subbands occurs because of the Kohn anomaly, also modified by SO coupling.",1306.1165v1
+2015-05-28,Incommensurate spin density wave at a ferromagnetic quantum critical point in a three-dimensional parabolic semimetal,"We explore the ferromagnetic quantum critical point in a three-dimensional
+semimetallic system with upward- and downward-dispersing bands touching at the
+Fermi level. Evaluating the static spin susceptibility to leading order in the
+coupling between the fermions and the fluctuating ferromagnetic order
+parameter, we find that the ferromagnetic quantum critical point is masked by
+an incommensurate, longitudinal spin density wave phase. We first analyze an
+idealized model which, despite having strong spin-orbit coupling, still
+possesses O(3) rotational symmetry generated by the total angular momentum
+operator. In this case, the direction of the incommensurate spin density wave
+propagation can point anywhere, while the magnetic moment is aligned along the
+direction of propagation. Including symmetry-allowed anisotropies in the
+fermion dispersion and the coupling to the order parameter field, however, the
+ordering wavevector instead breaks a discrete symmetry and aligns along either
+the [111] or [100] direction, depending on the signs and magnitudes of these
+two types of anisotropy.",1505.07685v1
+2016-06-06,Spin-Wave and Electromagnon Dispersions in Multiferroic MnWO4 as Observed by Neutron Spectroscopy: Isotropic Heisenberg Exchange versus Anisotropic Dzyaloshinskii-Moriya Interaction,"High resolution inelastic neutron scattering reveals that the elementary
+magnetic excitations in multiferroic MnWO4 consist of low energy dispersive
+electromagnons in addition to the well-known spin-wave excitations. The latter
+can well be modeled by a Heisenberg Hamiltonian with magnetic exchange coupling
+extending to the 12th nearest neighbor. They exhibit a spin-wave gap of 0.61(1)
+meV. Two electromagnon branches appear at lower energies of 0.07(1) meV and
+0.45(1) meV at the zone center. They reflect the dynamic magnetoelectric
+coupling and persist in both, the collinear magnetic and paraelectric AF1
+phase, and the spin spiral ferroelectric AF2 phase. These excitations are
+associated with the Dzyaloshinskii-Moriya exchange interaction, which is
+significant due to the rather large spin-orbit coupling.",1606.01954v1
+2012-04-27,Resonant harmonic generation and collective spin rotations in electrically driven quantum dots,"Spin rotations induced by an AC electric field in a two-electron double
+quantum dot are studied by an exact numerical solution of the time dependent
+Schroedinger equation in the context of recent electric dipole spin resonance
+experiments based on the Pauli blockade. We demonstrate that the splitting of
+the main resonance line by the spin exchange coupling is accompanied by the
+appearance of fractional resonances and that both these effects are triggered
+by interdot tunnel coupling. We find that the AC driven system generates
+residual but distinct harmonics of the driving frequency which are amplified
+when tuned to the main transition frequency. The mechanism is universal for
+electron systems in electrically driven potentials and works also in the
+absence of electron-electron interaction or spin-orbit coupling.",1204.6208v2
+2019-03-25,Quench dynamics of spin in quantum dots coupled to spin-polarized leads,"We investigate the quench dynamics of a quantum dot strongly coupled to
+spin-polarized ferromagnetic leads. The real-time evolution is calculated by
+means of the time-dependent density-matrix numerical renormalization group
+method implemented within the matrix product states framework. We examine the
+system's response to a quench in the spin-dependent coupling strength to
+ferromagnetic leads as well as in the position of the dot's orbital level. The
+spin dynamics is analyzed by calculating the time-dependent expectation values
+of the quantum dot's magnetization and occupation. Based on these, we determine
+the time-dependence of a ferromagnetic-contact-induced exchange field and
+predict its nonmonotonic build-up. In particular, two time scales are
+identified, describing the development of the exchange field and the dot's
+magnetization sign change. Finally, we study the effects of finite temperature
+on the dynamical behavior of the system.",1903.10381v1
+2021-01-19,Equal-time kinetic equations in a rotational field,"We investigate quantum kinetic theory for a massive fermion system under a
+rotational field. From the Dirac equation in curved space we derive the
+complete set of kinetic equations for the spin components of the covariant and
+equal-time Wigner functions. While the particles are no longer on a mass shell
+in general case due to the rotation-spin coupling, there are always only two
+independent components, which can be taken as the number and spin densities.
+With the help from the off-shell constraint we obtain the closed transport
+equations for the two independent components in classical limit and at quantum
+level. The classical rotation-orbital coupling controls the dynamical evolution
+of the number density, but the quantum rotation-spin coupling explicitly
+changes the spin density.",2101.07596v1
+2022-04-23,Nonreciprocal light propagation induced by a subwavelength spinning cylinder,"Nonreciprocal optical devices have broad applications in light manipulations
+for communications and sensing. Non-magnetic mechanisms of optical
+nonreciprocity are highly desired for high-frequency on-chip applications.
+Here, we investigate the nonreciprocal properties of light propagation in a
+dielectric waveguide induced by a subwavelength spinning cylinder. We find that
+the chiral modes of the cylinder can give rise to unidirectional coupling with
+the waveguide via the transverse spin-orbit interaction, leading to different
+transmissions for guided wave propagating in opposite directions and thus
+optical isolation. We reveal the dependence of the nonreciprocal properties on
+various system parameters including mode order, spinning speed, and coupling
+distance. The results show that higher-order chiral modes and larger spinning
+speed generally give rise to stronger nonreciprocity, and there exists an
+optimal cylinder-waveguide coupling distance where the optical isolation
+reaches the maximum. Our work contributes to the understanding of
+nonreciprocity in subwavelength moving structures and can find applications in
+integrated photonic circuits, topological photonics, and novel metasurfaces.",2204.11093v1
+2006-09-20,Microscopic theories for cubic and tetrahedral superconductors: application to PrOs_4Sb_{12},"We examine weak-coupling theory for unconventional superconducting states of
+cubic or tetrahedral symmetry for arbitrary order parameters and Fermi surfaces
+and identify the stable states in zero applied field. We further examine the
+possibility of having multiple superconducting transitions arising from the
+weak breaking of a higher symmetry group to cubic or tetrahedral symmetry.
+Specifically, we consider two higher symmetry groups. The first is a weak
+crystal field theory in which the spin-singlet Cooper pairs have an approximate
+spherical symmetry. The second is a weak spin orbit coupling theory for which
+spin-triplet Cooper pairs have a cubic orbital symmetry and an approximate
+spherical spin rotational symmetry. In hexagonal UPt_3, these theories easily
+give rise to multiple transitions. However, we find that for cubic materials,
+there is only one case in which two superconducting transitions occur within
+weak coupling theory. This sequence of transitions does not agree with the
+observed properties of PrOs_4Sb_{12}. Consequently, we find that to explain two
+transitions in PrOs_4Sb_{12} using approximate higher symmetry groups requires
+a strong coupling theory. In view of this, we finally consider a weak coupling
+theory for which two singlet representations have accidentally nearly
+degenerate transition temperatures (not due to any approximate symmetries). We
+provide an example of such a theory that agrees with the observed properties of
+PrOs_4Sb_{12}.",0609530v1
+2021-09-18,Realization of Qi-Wu-Zhang model in spin-orbit-coupled ultracold fermions,"Based on the optical Raman lattice technique, we experimentally realize the
+Qi-Wu-Zhang model for quantum anomalous Hall phase in ultracold fermions with
+two-dimensional (2D) spin-orbit (SO) coupling. We develop a novel protocol of
+pump-probe quench measurement to probe, with minimal heating, the resonant spin
+flipping on particular quasi-momentum subspace called band-inversion surfaces.
+With this protocol we demonstrate the first Dirac-type 2D SO coupling in a
+fermionic system, and detect non-trivial band topology by observing the change
+of band-inversion surfaces as the two-photon detuning varies. The non-trivial
+band topology is also observed by slowly loading the atoms into optical Raman
+lattices and measuring the spin textures. Our results show solid evidence for
+the realization of the minimal SO-coupled quantum anomalous Hall model, which
+can provide a feasible platform to investigate novel topological physics
+including the correlation effects with SO-coupled ultracold fermions.",2109.08885v2
+2001-02-13,Isotopically engineered silicon/silicon-germanium nanostructures as basic elements for a nuclear spin quantum computer,"The idea of quantum computation is the most promising recent developments in
+the high-tech domain, while experimental realization of a quantum computer
+poses a formidable challenge. Among the proposed models especially attractive
+are semiconductor based nuclear spin quantum computer's (S-NSQC), where nuclear
+spins are used as quantum bistable elements, ''qubits'', coupled to the
+electron spin and orbital dynamics. We propose here a scheme for implementation
+of basic elements for S-NSQC's which are realizable within achievements of the
+modern nanotechnology. These elements are expected to be based on a
+nuclear-spin-controlled isotopically engineered Si/SiGe heterojunction, because
+in these semiconductors one can vary the abundance of nuclear spins by
+engineering the isotopic composition. A specific device is suggested, which
+allows one to model the processes of recording, reading and information
+transfer on a quantum level using the technique of electrical detection of the
+magnetic state of nuclear spins. Improvement of this technique for a
+semiconductor system with a relatively small number of nuclei might be applied
+to the manipulation of nuclear spin ''qubits'' in the future S-NSQC.",0102228v1
+2002-01-28,Spin Ordering and Quasiparticles in Spin Triplet Superconducting Liquids,"Spin ordering and its effect on low energy quasiparticles in a p-wave
+superconducting liquid are investigated. We show that there is a new 2D p-wave
+superconducting liquid where the ground state is rotation invariant. In quantum
+spin disordered liquids, the low energy quasiparticles are bound states of the
+bare Bogolubov- De Gennes (${\em BdeG}$) quasiparticles and zero energy
+skyrmions, which are charge neutral bosons at the low energy limit. Further
+more, spin collective excitations are fractionalized ones carrying a half spin
+and obeying fermionic statistics. In thermally spin disordered limits, the
+quasi-particles are bound states of bare ${\em BdeG}$ quasi-particles. The
+latter situation can be realized in some layered p-wave superconductors where
+the spin-orbit coupling is weak.",0201512v3
+2003-07-05,Anisotropic splitting of intersubband spin plasmons in quantum wells with bulk and structural inversion asymmetry,"In semiconductor heterostructures, bulk and structural inversion asymmetry
+and spin-orbit coupling induce a k-dependent spin splitting of valence and
+conduction subbands, which can be viewed as being caused by momentum-dependent
+crystal magnetic fields. This paper studies the influence of these effective
+magnetic fields on the intersubband spin dynamics in an asymmetric n-type
+GaAs/AlGaAs quantum well. We calculate the dispersions of intersubband spin
+plasmons using linear response theory. The so-called D'yakonov-Perel'
+decoherence mechanism is inactive for collective intersubband excitations,
+i.e., crystal magnetic fields do not lead to decoherence of spin plasmons.
+Instead, we predict that the main signature of bulk and structural inversion
+asymmetry in intersubband spin dynamics is a three-fold, anisotropic splitting
+of the spin plasmon dispersion. The importance of many-body effects is pointed
+out, and conditions for experimental observation with inelastic light
+scattering are discussed.",0307124v1
+2004-07-12,Spin-Orbit Coupling in Diamond and Zincblende Heterostructures,"Spin splittings in III-V materials and heterostructures are of interest
+because of potential applications, mainly in spintronic devices. A necessary
+condition for the existence of these spin splittings is the absence of
+inversion symmetry. In bulk zincblende materials the inversion symmetry is
+broken, giving rise to a small spin splitting. The much larger spin splitting
+observed in quantum wells is normally attributed to the asymmetry of the
+confining potential and explained on the basis of the Rashba effect. For
+symmetrically confined wells, where the only source of asymmetry is that of the
+underlying crystal potential, the confining potential strongly enhances the
+spin splittings. This enhancement does not require the asymmetry of the
+confining potential but depends on the interplay between the confinement and
+the crystal potential. In this situation the behavior of the spin splittings is
+consistent with the Dresselhaus contribution.
+  In asymmetrically confined wells both Dresselhaus and Rashba terms
+contribute.
+  We present a general theory of the spin splittings of these structures based
+on the group theory of diamond and zincblende heterostructures.",0407294v1
+2004-11-05,Properties and Detection of Spin Nematic Order in Strongly Correlated Electron Systems,"A spin nematic is a state which breaks spin SU(2) symmetry while preserving
+translational and time reversal symmetries. Spin nematic order can arise
+naturally from charge fluctuations of a spin stripe state. Focusing on the
+possible existence of such a state in strongly correlated electron systems, we
+build a nematic wave function starting from a t-J type model. The nematic is a
+spin-two operator, and therefore does not couple directly to neutrons. However,
+we show that neutron scattering and Knight shift experiments can detect the
+spin anisotropy of electrons moving in a nematic background. We find the mean
+field phase diagram for the nematic taking into account spin-orbit effects.",0411159v2
+2004-12-21,Theory of spin-polarized transport in semiconductor heterojunctions: Proposal for spin injection and detection in silicon,"Spin injection and detection in silicon is a difficult problem, in part
+because the weak spin-orbit coupling and indirect gap preclude using standard
+optical techniques. We propose two ways to overcome this difficulty, and
+illustrate their operation by developing a model for spin-polarized transport
+across a heterojunction. We find that equilibrium spin polarization of holes
+leads to a strong modification of the spin and charge dynamics of electrons,
+and we show how the symmetry properties of the charge current can be exploited
+to detect spin injection in silicon using currently available techniques.",0412580v2
+2006-08-14,Understanding spin Hall effects from the motion in SU(2)XU(1) fields,"We derive the classical counterpart of a previously obtained quantum
+mechanical covariant ``continuitylike'' equation for the spin density, and
+present an intuitive picture for elucidating the non-conservation of the spin
+current. This reveals the equations of motion for a particle with spin under
+the Yang-Mills field (in certain semiconductors) as well as the Maxwell field,
+from which the condition for an infinite spin relaxation time is drawn out
+directly. As a concrete example, we discuss the procession of the spin
+orientation in spin Hall effect with the so called ReD field, which undergoes a
+circle with the frequency dependent on both the strength of the spin-orbit
+coupling and the initial velocity. The anti-commutation of the Pauli matrices
+is found to be crucial in simplifying the equations of motion in the view of
+quantum mechanism of the same topics.",0608303v1
+2006-09-15,Relativistic treatment of spin-currents and spin-transfer torque,"It is shown that a useful relativistic generalization of the conventional
+spin density for the case of moving electrons is the expectation value of the
+four-component Bargmann-Wigner polarization operator. An exact equation of
+motion for this quantity is derived, using the one-particle Dirac equation, and
+the relativistic analogues of the non-relativistic concepts of spin-currents
+and spin-transfer torques are identified. In the classical limit the time
+evolution is governed by the equation of motion first proposed by Bargmann,
+Michel and Telegdi generalized to the case of inhomogeneous systems. In the
+non-relativistic limit it is found that the spin-current has an intrinsic Hall
+contribution and to order 1/c^2 a spin-orbit coupling related torque appears in
+the equation of motion. The relevance of these results to the theory of the
+intrinsic spin Hall effect and current-induced switching are briefly discussed.",0609376v2
+2007-06-01,Conserved spin Hall conductance in two dimensional electron gas in a perpendicular magnetic field,"Using the microscopic theory of the conserved spin current [Phys. Rev. Lett.
+\textbf{96}, 076604 (2006)], we investigate the spin Hall effect in the two
+dimensional electron gas system with a perpendicular magnetic field. The spin
+Hall conductance $\sigma_{\mu\nu}^{s}$ as a response to the electric field
+consists of two parts, i.e., the conventional part $\sigma_{\mu\nu}^{s0}$ and
+the spin torque dipole correction $\sigma_{\mu\nu}^{s\tau}$. It is shown that
+the spin-orbit coupling competes with Zeeman splitting by introducing
+additional degeneracies between different Landau levels at certain values of
+magnetic field. These degeneracies, if occurring at the Fermi level, turn to
+give rise to resonances in both $\sigma_{\mu\nu}^{s0}$ and $\sigma_{\mu\nu
+}^{s\tau}$ in spin Hall conductance. Remarkably, both of these two components
+have the same sign in the wide range of variation in the magnetic field, which
+result in an overall enhancement of the total spin Hall current. In particular,
+the magnitude of $\sigma_{\mu\nu}^{s\tau}$ is much larger than that of
+$\sigma_{\mu\nu}^{s0}$ around the resonance.",0706.0047v1
+2007-06-12,Graphene Spin Transistor,"Graphitic nanostructures, e.g. carbon nanotubes (CNT) and graphene, have been
+proposed as ideal materials for spin conduction[1-7]; they have long electronic
+mean free paths[8] and small spin-orbit coupling[9], hence are expected to have
+very long spin-scattering times. In addition, spin injection and detection in
+graphene opens new opportunities to study exotic electronic states such as the
+quantum Hall[10,11] and quantum spin Hall[9] states, and spin-polarized edge
+states[12] in graphene ribbons. Here we perform the first non-local four-probe
+experiments[13] on graphene contacted by ferromagnetic Permalloy electrodes. We
+observe sharp switching and often sign-reversal of the non-local resistance at
+the coercive field of the electrodes, indicating definitively the presence of a
+spin current between injector and detector. The non-local resistance changes
+magnitude and sign quasi-periodically with back-gate voltage, and
+Fabry-Perot-like oscillations[6,14,15] are observed, consistent with
+quantum-coherent transport. The non-local resistance signal can be observed up
+to at least T = 300 K.",0706.1597v1
+2008-08-08,Hole spin relaxation in $p$-type GaAs quantum wires,"We investigate the spin relaxation of $p$-type GaAs quantum wires by
+numerically solving the fully microscopic kinetic spin Bloch equations. We find
+that the quantum-wire size influences the spin relaxation time effectively by
+modulating the energy spectrum and the heavy-hole--light-hole mixing of wire
+states. The effects of quantum-wire size, temperature, hole density, and
+initial polarization are investigated in detail. We show that, depending on the
+situation, the spin relaxation time can either increase or decrease with hole
+density. Due to the different subband structure and effects arising from
+spin-orbit coupling, many spin-relaxation properties are quite different from
+those of holes in the bulk or in quantum wells, and the inter-subband
+scattering makes a marked contribution to the spin relaxation.",0808.1170v2
+2008-08-22,Perturbation Method for Classical Spinning Particle Motion: I. Kerr Space-Time,"This paper presents an analytic perturbation approach to the dynamics of a
+classical spinning particle, according to the Mathisson-Papapetrou-Dixon (MPD)
+equations of motion, with a direct application to circular motion around a Kerr
+black hole. The formalism is established in terms of a power series expansion
+with respect to the particle's spin magnitude, where the particle's kinematic
+and dynamical degrees are expressed in a completely general form that can be
+constructed to infinite order in the expansion parameter. It is further shown
+that the particle's squared mass and spin magnitude can shift due to a
+classical analogue of radiative corrections that arise from spin-curvature
+coupling. Explicit expressions are determined for the case of circular motion
+near the event horizon a Kerr black hole, where the mass and spin shift
+contributions are dependent on the initial conditions of the particle's spin
+orientation. A preliminary analysis of the stability properties of the orbital
+motion in the Kerr background due to spin-curvature interactions is explored
+and briefly discussed.",0808.3005v2
+2010-02-05,"Electron spin coherence in metallofullerenes: Y, Sc and La@C82","Endohedral fullerenes encapsulating a spin-active atom or ion within a carbon
+cage offer a route to self-assembled arrays such as spin chains. In the case of
+metallofullerenes the charge transfer between the atom and the fullerene cage
+has been thought to limit the electron spin phase coherence time (T2) to the
+order of a few microseconds. We study electron spin relaxation in several
+species of metallofullerene as a function of temperature and solvent
+environment, yielding a maximum T2 in deuterated o-terphenyl greater than 200
+microseconds for Y, Sc and La@C82. The mechanisms governing relaxation (T1, T2)
+arise from metal-cage vibrational modes, spin-orbit coupling and the nuclear
+spin environment. The T2 times are over 2 orders of magnitude longer than
+previously reported and consequently make metallofullerenes of interest in
+areas such as spin-labelling, spintronics and quantum computing.",1002.1282v1
+2010-04-13,Quantum dots and spin qubits in graphene,"This is a review on graphene quantum dots and their use as a host for spin
+qubits. We discuss the advantages but also the challenges to use graphene
+quantum dots for spin qubits as compared to the more standard materials like
+GaAs. We start with an overview of this young and fascinating field and will
+then discuss gate-tunable quantum dots in detail. We calculate the bound states
+for three different quantum dot architectures where a bulk gap allows for
+confinement via electrostatic fields: (i) graphene nanoribbons with armchair
+boundary, (ii) a disc in single-layer graphene, and (iii) a disc in bilayer
+graphene. In order for graphene quantum dots to be useful in the context of
+spin qubits, one needs to find reliable ways to break the valley-degeneracy.
+This is achieved here, either by a specific termination of graphene in (i) or
+in (ii) and (iii) by a magnetic field, without the need of a specific boundary.
+We further discuss how to manipulate spin in these quantum dots and explain the
+mechanism of spin decoherence and relaxation caused by spin-orbit interaction
+in combination with electron-phonon coupling, and by hyperfine interaction with
+the nuclear spin system.",1004.2136v1
+2011-05-28,Relaxation of Electron Spin during High-Field Transport in GaAs Bulk,"A semiclassical Monte Carlo approach is adopted to study the multivalley spin
+depolarization of drifting electrons in a doped n-type GaAs bulk semiconductor,
+in a wide range of lattice temperature ($40<T_L<300$ K) and doping density
+($10^{13}<n<10^{16}$cm$^{-3}$). The decay of the initial non-equilibrium spin
+polarization of the conduction electrons is investigated as a function of the
+amplitude of the driving static electric field, ranging between 0.1 and 6
+kV/cm, by considering the spin dynamics of electrons in both the $\Gamma$ and
+the upper valleys of the semiconductor. Doping density considerably affects
+spin relaxation at low temperature and weak intensity of the driving electric
+field. At high values of the electric field, the strong spin-orbit coupling of
+electrons in the $L$-valleys significantly reduces the average spin
+polarization lifetime, but, unexpectedly, for field amplitudes greater than 2.5
+kV/cm, the spin lifetime increases with the lattice temperature. Our numerical
+findings are validated by a good agreement with the available experimental
+results and with calculations recently obtained by a different theoretical
+approach.",1105.5716v2
+2011-12-12,Spin-blockade effect and coherent control of DNA-damage by free radicals: a proposal on bio-spintronics,"Coherent control of OH-free radicals interacting with the spin-triplet state
+of a DNA molecule is investigated. A model Hamiltonian for molecular spin
+singlet-triplet resonance is developed. We illustrate that the spin-triplet
+state in DNA molecules can be efficiently populated, as the spin-injection rate
+can be tuned to be orders of magnitudes greater than the decay rate due to
+small spin-orbit coupling in organic molecules. Owing to the nano-second
+life-time of OH free radicals, a non-equilibrium free energy barrier induced by
+the injected spin triplet state that lasts approximately longer than one-micro
+second in room temperature can efficiently block the initial Hydrogen
+abstraction and DNA damage. For a direct demonstration of the spin-blockade
+effect, a molecular simulation based on an {\em ab-initio} Car-Parrinello
+molecular dynamics is deployed.",1112.2733v1
+2012-03-25,Spin-polarized current separator based on a fork-shaped Rashba nanostructure,"A scheme for a spin-polarized current separator is proposed by studying the
+spin-dependent electron transport of a fork-shaped nanostructure with Rashba
+spin-orbit coupling (SOC), connected to three leads with the same width. It is
+found that two spin-polarized currents are of the same magnitude but opposite
+polarizations can be generated simultaneously in the two output leads when the
+spin-unpolarized electrons injected from the input lead. The underlying physics
+is revealed to originate from the different spin-dependent conductance caused
+by the effects of Rashba SOC and the geometrical structure of the system.
+Further study shows that the spin-polarized current with strong a robustness
+against disorder, demonstrates the feasibility of the proposed nanostructure
+for a real application.",1203.5473v1
+2012-06-06,Spin-polarized current induced by a local exchange field in a silicene nanoribbon,"A mechanism to generate a spin-polarized current in a two-terminal zigzag
+silicene nanoribbon is predicted. As a weak local exchange field that is
+parallel to the surface of silicene is applied on one of edges of the silicene
+nanoribbon, a gap is opened in the corresponding gapless edge states but
+another pair of gapless edge states with opposite spin are still protected by
+the time-reversal symmetry. Hence, a spin-polarized current can be induced in
+the gap opened by the local exchange field in this two-terminal system. What is
+important is that the spin-polarized current can be obtained even in the
+absence of Rashba spin-orbit coupling and in the case of the very weak exchange
+filed. That is to say, the mechanism to generate the spin-polarized currents
+can be easily realized experimentally.We also find that the spin-polarized
+current is insensitive to weak disorder.",1206.1114v2
+2012-06-29,Spin Relaxation in Single Layer Graphene with Tunable Mobility,"Graphene is an attractive material for spintronics due to theoretical
+predictions of long spin lifetimes arising from low spin-orbit and hyperfine
+couplings. In experiments, however, spin lifetimes in single layer graphene
+(SLG) measured via Hanle effects are much shorter than expected theoretically.
+Thus, the origin of spin relaxation in SLG is a major issue for graphene
+spintronics. Despite extensive theoretical and experimental work addressing
+this question, there is still little clarity on the microscopic origin of spin
+relaxation. By using organic ligand-bound nanoparticles as charge reservoirs to
+tune mobility between 2700 and 12000 cm2/Vs, we successfully isolate the effect
+of charged impurity scattering on spin relaxation in SLG. Our results
+demonstrate that while charged impurities can greatly affect mobility, the spin
+lifetimes are not affected by charged impurity scattering.",1206.6941v1
+2014-01-05,Dynamics of spin-flip photon-assisted tunneling,"We present time-resolved measurements of spin-flip photon-assisted tunneling
+and spin-flip relaxation in a doubly occupied double quantum dot. The
+photon-assisted excitation rate as a function of magnetic field indicates that
+spin-orbit coupling is the dominant mechanism behind the spin-flip under the
+present conditions. We are able to extract the resulting effective `spin-flip
+tunneling' energy, which is found to be three orders of magnitude smaller than
+the regular spin-conserving tunneling energy. We also measure the relaxation
+and dephasing times of a qubit formed out of two two-electron states with
+different spin and charge configurations.",1401.0881v1
+2014-11-14,Spin Correlations in Quantum Wires,"We consider theoretically spin correlations in an 1D quantum wire with
+Rashba-Dresselhaus spin-orbit interaction (RDI). The correlations of
+non-interacting electrons display electron-spin resonance at a frequency
+proportional to the RDI coupling. Interacting electrons on varying the
+direction of external magnetic field transit from the state of Luttinger liquid
+(LL) to the spin density wave (SDW) state. We show that the two-time total spin
+correlations of these states are significantly different. In the LL the
+projection of total spin to the direction of the RDI induced field is conserved
+and the corresponding correlator is equal to zero. The correlators of two
+components perpendicular to the RDI field display a sharp ESR driven by RDI
+induced intrinsic field. In contrast, in the SDW state the longitudinal
+projection of spin dominates, whereas the transverse components are suppressed.
+This prediction indicates a simple way for experimental diagnostic of the SDW
+in a quantum wire.",1411.4084v2
+2015-01-28,Universal spin-triplet superconducting correlations of Majorana fermions,"We establish that Majorana fermions on the boundary of topological
+superconductors have only spin-triplet superconducting correlations independent
+of whether the bulk superconducting gap is spin singlet or triplet. This is
+universal for time-reversal broken (respected) topological superconductors
+(TSCs) with an odd number of (pairs of) Majorana fermions on the boundary.
+Consequently, resonant Andreev reflection induced by Majorana fermions only
+occurs in spin-triplet channels and always injects spin-triplet Cooper pairs
+into the leads. This spin-triplet condensate results in a spin-orbit coupling
+(SOC) controlled oscillatory critical current without a $0$-$\pi$ transition in
+the TSC/SOC-semiconductor/TSC Josephson junction. The observation of this
+unique current-phase relation can serve as the definitive signal for Majorana
+fermions. Our study shows a technique for manipulating Majorana fermions based
+on their spin-triplet superconducting correlations.",1501.07273v2
+2015-03-25,Intercombination Effects in Resonant Energy Transfer,"We investigate the effect of intercombination transitions in excitation
+hopping processes such as those found in F\""orster resonance energy transfer.
+Taking strontium Rydberg states as our model system, the breakdown of
+$LS$-coupling leads to weakly allowed transitions between Rydberg states of
+different spin quantum number. We show that the long-range interactions between
+two Rydberg atoms can be affected by these weakly allowed spin transitions, and
+the effect is greatest when there is a near-degeneracy between the initial
+state and a state with a different spin quantum number. We also consider a case
+of four atoms in a spin chain, and show that a spin impurity can resonantly hop
+along the chain. By engineering the many-body energy levels of the spin-chain,
+the breakdown of $LS$ coupling due to inter-electronic effects in individual
+atoms can be mapped onto a spatial separation of the total spin and the total
+orbital angular momentum along the spin chain.",1503.07417v4
+2015-06-17,Cooperative phenomenon in a rippled graphene: Chiral spin guide,"We analyze spin scattering in ballistic transport of electrons through a
+ripple at a normal incidence of an electron flow. The model of a ripple
+consists of a curved graphene surface in the form of an arc of a circle
+connected from the left-hand and right-hand sides to two flat graphene sheets.
+At certain conditions the curvature induced spin-orbit coupling creates a
+transparent window for incoming electrons with one spin polarization
+simultaneously with a backscattering of those with opposite polarization. This
+window is equally likely transparent for electrons with spin up and spin down
+that move in opposite directions. The spin filtering effect being small in one
+ripple becomes prominent with the increase of N consequently connected ripples
+that create a graphene sheet of the sinusoidal type. We present the analytical
+expressions for spin up (down) transmission probabilities as a function of N
+connected ripples.",1506.05409v2
+2017-02-05,Chiral Spin Condensation in a One-Dimensional Optical Lattice,"We study a spinor (two-component) Bose gas confined in a one-dimensional
+double-valley optical lattice which has a double-well structure in momentum
+space. Based on field theory analysis, it is found that spinor bosons in the
+double-valley band may form a spin-charge mixed chiral spin quasicondensate
+under certain conditions. Our numerical calculations in a concrete $\pi$-flux
+triangular ladder system confirm the robustness of the chiral spin order
+against interactions and quantum fluctuations. This exotic atomic Bose-Einstein
+condensate exhibits spatially staggered spin loop currents without any charge
+dynamics despite the complete absence of spin-orbit coupling in the system,
+creating an interesting approach to atom spintronics. The entanglement entropy
+scaling allows us to extract conformal-field-theory central charge and
+establish the low-energy effective field theory for the chiral spin condensate
+as a two-component Luttinger liquid. Our predictions should be detectable in
+atomic experiments through spin-resolved time-of-flight techniques.",1702.01439v2
+2010-05-10,Anisotropy of Magnetic Interactions in the Spin-Ladder Compound (C$_5$H$_{12}$N)$_2$CuBr$_4$,"Magnetic excitations in the spin-ladder material (C$_5$H$_{12}$N)$_2$CuBr$_4$
+[BPCB] are probed by high-resolution multi-frequency electron spin resonance
+(ESR) spectroscopy. Our experiments provide a direct evidence for a biaxial
+anisotropy ($\sim 5\%$ of the dominant exchange interaction), that is in
+contrast to a fully isotropic spin-ladder model employed for this system
+previously. It is argued that this anisotropy in BPCB is caused by spin-orbit
+coupling, which appears to be important for describing magnetic properties of
+this compound. The zero-field zone-center gap in the excitation spectrum of
+BPCB, $\Delta_0/k_{B}=16.5$ K, is detected directly. Furthermore, an ESR
+signature of the inter-ladder exchange interactions is obtained. The detailed
+characterization of the anisotropy in BPCB completes the determination of the
+full spin hamiltonian of this exceptional spin-ladder material and shows ways
+to study anisotropy effects in spin ladders.",1005.1474v1
+2016-12-31,Spin Transport and Accumulation in 2D Weyl Fermion System,"In this work, we study the spin Hall effect and Rashba-Edelstein effect of a
+2D Weyl fermion system in the clean limit using the Kubo formalism. Spin
+transport is solely due to the spin-torque current in this strongly spin-orbit
+coupled (SOC) system, and chiral spin-flip scattering off non-SOC scalar
+impurities, with potential strength $V$ and size $a$, gives rise to a
+skew-scattering mechanism for the spin Hall effect. The key result is that the
+resultant spin-Hall angle has a fixed sign, with $\theta^{SH} \sim O
+\left(\tfrac{V^2}{v_F^2/a^2} (k_F a)^4 \right)$ being a strongly-dependent
+function of $k_F a$, with $k_F$ and $v_F$ being the Fermi wave-vector and Fermi
+velocity respectively. This, therefore, allows for the possibility of tuning
+the SHE by adjusting the Fermi energy or impurity size.",1701.00074v3
+2011-11-15,Dynamical spin Hall conductivity in a magnetic disordered system,"We investigate the intrinsic spin Hall effect in a quantum well semiconductor
+doped with magnetic impurities, as a means to manipulate the carriers' spin.
+Using a simple Hamiltonian with Rashba spin-orbit coupling and exchange
+interactions, we analytically compute the spin Hall conductivity. It is
+demonstrated that using the appropriate order of limits, one recovers the
+intrinsic universal value. Numerical computations on a tight-binding model, in
+the weak disorder regime, confirm that the spin Hall effect is preserved in the
+presence of magnetic impurities. The optical spin conductivity shows large
+sample to sample fluctuations in the low frequency region. As a consequence,
+for weak disorder, the static spin conductivity is found to follow a wide
+Gaussian distribution with its mean value near the intrinsic clean value.",1111.3575v1
+2011-11-15,Mach-Zehnder Interferometric device for spin filtering in a GaAs/AlGaAs electron gas,"A spin filtering device using quantum spin interference is theoretically
+proposed in a GaAs/AlGaAs electron gas that has both Rashba and Dresselhaus
+spin-orbit couplings. The device achieves polarized electron currents by
+separating spin up and spin down components without a magnetic field gradient.
+We find two broad spin filtering regimes, one where the interferometer has
+symmetrical arms, where a small magnetic flux is needed to achieve spin
+separation, and the other with asymmetric arms where the change in path length
+renders an extra phase emulating the effects of a magnetic field. We identify
+operating points for the device where optimal electron polarization is achieved
+within value ranges found in a 2D electron gas. Both device setups apply for
+arbitrary incoming electron polarization and operate at broad energy ranges
+within the incoming electron band.",1111.3624v1
+2014-05-29,Helical spin texture of surface states in topological superconductors,"Surface states of topological noncentrosymmetric superconductors exhibit
+intricate helical spin textures, i.e., the spin orientation of the surface
+quasiparticles is coupled to their momentum. Using quasiclassical theory, we
+study the spin polarization of the surface states as a function of the
+spin-orbit interaction and superconducting pairing symmetry. We focus on two-
+and three-dimensional fully gapped and nodal noncentrosymmetric
+superconductors. For the case of nodal systems, we show that the spin
+polarization of the topological flat bands is controlled by the spin
+polarization of the bulk normal states at the bounding gap nodes. We
+demonstrate that the zero-bias conductance in a magnetic tunnel junction can be
+used as an experimental test of the surface-state spin polarization.",1405.7733v1
+2017-06-16,Gate-tunable large magnetoresistance in an all-semiconductor spin-transistor-like device,"A large spin-dependent and electric field-tunable magnetoresistance of a
+two-dimensional electron system (2DES) is a key ingredient for the realization
+of many novel concepts for spin-based electronic devices. The low
+magnetoresistance observed during the last decades in devices with lateral
+semiconducting (SC) transport channels between ferromagnetic (FM) source (S)
+and drain (D) contacts has been the main obstacle for realizing spin field
+effect transistor proposals. Here, we show both, a large two terminal
+magnetoresistance in lateral 2DES-based spin valve geometry, with up to 80%
+resistance change, and tunability of the magnetoresistance by an electric gate.
+The large magnetoresistance is due to finite electric field effects at the
+FM/SC interface, which boost spin-to-charge conversion. The gating scheme we
+use is based on switching between uni- and bi-directional spin diffusion,
+without resorting to the spin-orbit coupling.",1706.05239v1
+2017-10-24,Trigonal warping induced terraced spin texture and nearly perfect spin polarization in graphene with Rashba effect,"Electrical tunability of spin polarization has been a focus in spintronics.
+Here, we report that the trigonal warping (TW) effect, together with spin-orbit
+coupling (SOC), can lead to two distinct magnetoelectric effects in
+low-dimensional systems. Taking graphene with Rashba SOC as example, we study
+the electronic properties and spin-resolved scattering of system. It is found
+that the TW effect gives rise to a terraced spin texture in low-energy bands
+and can render significant spin polarization in the scattering, both resulting
+in an efficient electric control of spin polarization. Our work unveils not
+only SOC but also the TW effect is important for low-dimensional spintronics.",1710.08669v1
+2019-07-19,Direct observations of chiral spin textures in van der Waals magnet Fe3GeTe2 nanolayers,"In two-dimensional van der Waals (vdW) magnets, the presence of magnetic
+orders, strong spin-orbit coupling and asymmetry at interfaces is the key
+ingredient for hosting chiral spin textures. However, experimental evidences
+for chiral magnetism in vdW magnets remain elusive. Here we demonstrate
+unambiguously the formation of chiral spin textures in thin Fe3GeTe2 nanoflakes
+using advanced magnetic electron microscopy and first-principles calculations.
+Specifically, electron holography analyses reveal the spin configurations of
+N\'eel-type, zero-field-stabilized skyrmions in 20-nm-thick Fe3GeTe2 nanoflakes
+at cryogenic temperature. In situ Lorentz transmission electron microscopy
+measurements further provide detailed magnetic phase diagrams of chiral spin
+textures including spirals and skyrmions in Fe3GeTe2 as a function of
+temperature, applied magnetic field and specimen thickness. First-principles
+calculations unveil a finite interfacial Dzyaloshinskii-Moriya interaction in
+the Te/Fe3Ge/Te slabs that induces the spin chirality in Fe3GeTe2. Our
+discovery of spin chirality in the prototypical vdW Fe3GeTe2 opens up new
+opportunities for studying chiral magnetism in two-dimensional vdW magnets from
+both fundamental and applied perspectives.",1907.08382v1
+2019-10-22,Novel chiral quantum spin liquids in Kitaev magnets,"Mott insulators under sufficiently strong spin-orbit coupling can display
+quantum spin liquid phases with topological order and fractional excitations.
+Quantum magnets with pure Kitaev spin exchange interactions can host a gapped
+quantum spin liquid with a single Majorana edge mode propagating in the
+counter-clockwise direction when a small positive magnetic field is applied.
+Here, we show how under a sufficiently strong positive magnetic field a
+topological transition into a gapped quantum spin liquid with two Majorana edge
+modes propagating in the clockwise direction occurs. The Dzyaloshinskii-Moriya
+interaction is found to turn the non-chiral Kitaev's gapless quantum spin
+liquid into a chiral one with equal Berry phases at the two Dirac points.
+Thermal Hall conductance experiments can provide evidence of the novel
+topologically gapped quantum spin liquid states predicted.",1910.09874v2
+2020-02-04,One-way reflection-free exciton-polariton spin filtering channel,"We consider theoretically exciton-polaritons in a strip of honeycomb lattice
+with zigzag edges and it is shown that the interplay among the spin-orbit
+coupling, Zeeman splitting, and an onsite detuning between sublattices can give
+rise to a band structure where all the edge states of the system split in
+energy. Within an energy interval, one of the spin polarized edge states
+resides with the gap-less bulk having opposite spin. Being surrounded by
+opposite spin and the absence of the backward propagating edge state ensures
+both reflection free and feedback suppressed one-way flow of polaritons with
+one particular spin in the system. The edge states in this system are more
+localized than those in the standard topological polariton systems and are
+fully spin polarized. This paves the way for feedback free spin-selective
+polariton channels for transferring information in polariton networks.",2002.01168v1
+2020-02-25,Engineering the molecular structure to optimize the spin Hall signal in organics,"In this study, by engineering the molecular structure, we optimize the spin
+Hall conductivity and the spin Hall angle in organics by more than five and
+three orders of magnitude, respectively. We identify two important
+characteristics of organic molecules, namely substitution of heavy elements and
+the torsion angles between constituent units of the polymer, which have
+significant effects on the spin Hall signal. These characteristics are directly
+related to the spin-orbit coupling and the energetic disorder, both of which
+offer a wide scope of chemical tunability in high-mobility polymers. We compute
+the spin Hall characteristics for easily synthesized molecules and identify
+candidates to exhibit the largest spin Hall signals in organic systems, several
+orders of magnitude larger than previously observed. The present study brings
+organic spintronics, by introducing polymers with much stronger spin Hall
+signal, closer to their inorganic counterparts.",2002.11092v2
+2017-09-25,Strain-induced large spin splitting and persistent spin helix at LaAlO$_3$/SrTiO$_3$ interface,"We investigated the effect of the tensile strain on the spin splitting at the
+n-type interface in LaAlO$_3$/SrTiO$_3$ in terms of the spin-orbit coupling
+coefficient $\alpha$ and spin texture in the momentum space using
+first-principles calculations. We found that the $\alpha$ could be controlled
+by the tensile strain and be enhanced up to 5 times for the tensile strain of
+7%, and the effect of the tensile strain leads to a persistent spin helix,
+which has a long spin lifetime. These results support that the strain effect on
+LaAlO$_3$/SrTiO$_3$ is important for various applications such as spinFET and
+spin-to-charge conversion.",1709.08335v2
+2018-03-28,Persistent Spin Helix Manipulation by Optical Doping of a CdTe Quantum Well,"Time-resolved Kerr-rotation microscopy explores the influence of optical
+doping on the persistent spin helix in a [001]-grown CdTe quantum well at
+cryogenic temperatures. Electron spin diffusion dynamics reveal a
+momentum-dependent effective magnetic field providing SU(2) spin-rotation
+symmetry, consistent with kinetic theory. The Dresselhaus and Rashba spin-orbit
+coupling parameters are extracted independently from rotating the spin helix
+with external magnetic fields applied parallel and perpendicular to the
+effective magnetic field. Most importantly, a non-uniform spatiotemporal
+precession pattern is observed. The kinetic theory framework of spin diffusion
+allows for modeling of this finding by incorporating the photocarrier density
+into the Rashba ($\alpha$) and the Dresselhaus ($\beta_3$) parameters.
+Corresponding calculations are further validated by an excitation-density
+dependent measurement. This work shows universality of the persistent spin
+helix by its observation in a II-VI compound and the ability to fine-tune it by
+optical doping.",1803.10644v1
+2018-06-08,Anomalous Hall magnetoresistance in a ferromagnet,"The anomalous Hall effect, observed in conducting ferromagnets with broken
+time-reversal symmetry, offers the possibility to couple spin and orbital
+degrees of freedom of electrons in ferromagnets. In addition to charge, the
+anomalous Hall effect also leads to spin accumulation at the surfaces
+perpendicular to both the current and magnetization direction. Here we
+experimentally demonstrate that the spin accumulation, subsequent spin
+backflow, and spin-charge conversion can give rise to a different type of spin
+current related magnetoresistance, dubbed here as the anomalous Hall
+magnetoresistance, which has the same angular dependence as the recently
+discovered spin Hall magnetoresistance. The anomalous Hall magnetoresistance is
+observed in four types of samples: co-sputtered (Fe1-xMnx)0.6Pt0.4, Fe1-xMnx
+and Pt multilayer, Fe1-xMnx with x = 0.17 to 0.65 and Fe, and analyzed using
+the drift-diffusion model. Our results provide an alternative route to study
+charge-spin conversion in ferromagnets and to exploit it for potential
+spintronic applications.",1806.03083v1
+2018-06-13,Phase-locking between different partial-waves in atom-ion spin-exchange collisions,"We present a joint experimental and theoretical study of spin dynamics of a
+single $^{88}$Sr$^+$ ion colliding with an ultracold cloud of Rb atoms in
+various hyperfine states. While spin-exchange between the two species occurs
+after 9.1(6) Langevin collisions on average, spin-relaxation of the Sr$^+$ ion
+Zeeman qubit occurs after 48(7) Langevin collisions which is significantly
+slower than in previously studied systems due to a small second-order
+spin-orbit coupling. Furthermore, a reduction of the endothermic spin-exchange
+rate was observed as the magnetic field was increased. Interestingly, we found
+that, while the phases acquired when colliding on the spin singlet and triplet
+potentials vary largely between different partial waves, the singlet-triplet
+phase difference, which determines the spin-exchange cross-section, remains
+locked to a single value over a wide range of partial-waves which leads to
+quantum interference effects.",1806.05150v2
+2018-12-06,Nonlinear excitonic spin Hall effect in monolayer transition metal dichalcogenides,"We propose and analyze a mechanism for inducing spin Hall currents in
+ordinary (1H phase) monolayer transition metal dichalcogenides (TMDs) due to
+the nonlinear process of optical rectification. The photo-induced spin current
+is proportional to the light intensity, and originates from the intrinsic
+spin-orbit coupling in TMDs. The spin current spectrum is strongly influenced
+by electron-hole interactions, i.e. excitonic effects, analogous to the optical
+absorption. Remarkably, excitons change the temperature dependence of the
+induced spin current, to the point that the current direction can even be
+reversed by varying the temperature. This peculiar excitonic behavior is shown
+to emerge from the relative strength of two distinct mechanisms contributing to
+the optical response, i.e. a purely interband part and a mixed inter/intraband
+contribution. Furthermore, we investigate the valley dichrosim of
+second-harmonic charge and spin currents, and demonstrate different valley
+polarization of $s$ and $p$ excitons that stem from their distinct angular
+momenta. Our findings pave the path to the generation of dc spin currents in
+ordinary TMDs without external static electric or magnetic fields.",1812.02596v1
+2018-12-12,Laser-Irradiated CrI$_3$: When Chiral Photons Meet Topological Magnons,"Insulating honeycomb ferromagnet CrI$_3$ has recently attracted considerable
+attention due to its potential use for dissipationless spintronics
+applications. Recently, topological spin excitations have been observed
+experimentally in bulk CrI$_3$ by L. Chen, et al. [Phys. Rev. X ${\bf 8}$,
+041028 (2018)] using inelastic neutron scattering. This suggest that bulk
+CrI$_3$ has strong spin-orbit coupling and its spin Hamiltonian should include
+a next-nearest neighbour Dzyaloshinskii-Moriya (DM) interaction. Inspired by
+this experiment, we study non-equilibrium emergent photon-dressed topological
+spin and thermal Hall transports in laser-irradiated CrI$_3$ with and without
+the DM interaction. We show that the spin excitations can be manipulated into
+different topological phases with different Chern numbers. Most importantly, we
+show that the emergent photon-dressed spin and thermal Hall response can be
+switched to different signs. Hence, the generated magnon spin photocurrents can
+be manipulated by the laser field, which is of great interest in ultrafast spin
+current generation and could pave the way for future applications of CrI$_3$ to
+topological opto-spintronics and opto-magnonics.",1812.05101v2
+2019-03-03,Near-Unity Spin Hall Ratio in Ni$_x$Cu$_{1-x}$ Alloys,"We report a large spin Hall effect in the 3$d$ transition metal alloy
+Ni$_x$Cu$_{1-x}$ for $x\in\left\{ 0.3,0.75\right\} $, detected via the
+ferromagnetic resonance of a Permalloy (Py = Ni$_{80}$Fe$_{20}$) film deposited
+in a bilayer with the alloy. A thickness series at $x$ = 0.6, for which the
+alloy is paramagnetic at room temperature, allows us to determine the spin Hall
+ratio $\theta_{\rm{SH}}\approx1$, spin diffusion length $\lambda_{\rm{s}}$,
+spin mixing conductance $G_{\uparrow\downarrow}$, and damping
+$\alpha_{\rm{SML}}$ due to spin memory loss . We compare our results with
+similar experiments on Py/Pt bilayers measured using the same method. Ab initio
+band structure calculations with disorder and spin-orbit coupling suggest an
+intrinsic spin Hall effect in Ni$_x$Cu$_{1-x}$ alloys, although the experiments
+here cannot distinguish between extrinsic and intrinsic mechanisms.",1903.00910v2
+2019-04-09,"Parafermions, induced edge states and domain walls in the fractional quantum Hall effect spin transitions","Search for parafermions and Fibonacci anyons, which are excitations obeying
+non-Abelian statistics, is driven both by the quest for deeper understanding of
+nature and prospects for universal topological quantum computation. However,
+physical systems that can host these exotic excitations are rare and hard to
+realize in experiments. Here we study the domain walls and the edge states
+formed in spin transitions in the fractional quantum Hall effect. Effective
+theory approach and exact diagonalization in a disk and torus geometries proves
+the existence of the counter-propagating edge modes with opposite spin
+polarizations at the boundary between the two neighboring regions of the
+two-dimensional electron liquid in spin-polarized and spin-unpolarized phases.
+By analytical and numerical analysis, we argue that these systems can host
+parafermions when coupled to an s-wave superconductor and are experimentally
+feasible. We investigate settings based on $\nu=\frac{2}{3}$, $\nu=\frac{4}{3}$
+and $\nu=\frac{5}{3}$ spin transitions and analyze spin-flipping interactions
+that hybridize counter-propagating modes. Finally, we discuss spin-orbit
+interactions of composite fermions.",1904.04719v1
+2020-05-14,Spin Hall Effect in Bilayer Graphene Combined with an Insulator up to Room Temperature,"Spin-orbit coupling in graphene can be enhanced by chemical
+functionalization, adatom decoration or proximity with a van der Waals
+material. As it is expected that such enhancement gives rise to a sizeable spin
+Hall effect, a spin-to-charge current conversion phenomenon of technological
+relevance, it has sparked wide research interest. However, it has only been
+measured in graphene/transition metal dichalcogenide van der Waals
+heterostructures with limited scalability. Here, we experimentally demonstrate
+spin Hall effect up to room temperature in bilayer graphene combined with a
+nonmagnetic insulator, an evaporated bismuth oxide layer. The measured spin
+Hall effect raises most likely from an extrinsic mechanism. With a large
+spin-to-charge conversion efficiency, scalability, and ease of integration to
+electronic devices, we show a promising material heterostructure suitable for
+spin-based device applications.",2005.07249v1
+2020-10-15,Emergent Bloch oscillations in a kinetically constrained Rydberg spin lattice,"We explore the relaxation dynamics of elementary spin clusters of a
+kinetically constrained spin system. Inspired by experiments with Rydberg
+lattice gases, we focus on the situation in which an excited spin leads to a
+""facilitated"" excitation of a neighboring spin. We show that even weak
+interactions that extend beyond nearest neighbors can have a dramatic impact on
+the relaxation behavior: they generate a linear potential, which under certain
+conditions leads to the onset of Bloch oscillations of spin clusters. These
+hinder the expansion of a cluster and more generally the relaxation of
+many-body states towards equilibrium. This shows that non-ergodic behavior in
+kinetically constrained systems may occur as a consequence of the interplay
+between reduced connectivity of many-body states and weak interparticle
+interactions. We furthermore show that the emergent Bloch oscillations
+identified here can be detected in experiment through measurements of the
+Rydberg atom density, and discuss how spin-orbit coupling between internal and
+external degrees of freedom of spin clusters can be used to control their
+relaxation behavior.",2010.07825v2
+2020-11-25,Perovskite as a spin current generator,"We theoretically show that materials with perovskite-type crystal structures
+provide a platform for spin current generation, taking advantage of a mechanism
+requiring neither the spin-orbit coupling nor a ferromagnetic moment, but is
+based on spin-split band structures in certain kinds of collinear
+antiferromagnetic states. By investigating a multiband Hubbard model for
+transition metal compounds by means of the Hartree-Fock approximation and the
+Boltzmann transport theory, we find that a pure spin current is induced by an
+electric field applied to a C-type antiferromagnetic metallic phase. The spin
+current generation originates from a cooperative effect of spatially
+anisotropic electron transfer integrals owing to the GdFeO$_3$-type lattice
+distortion, which is ubiquitous in many perovskites, and the collinear spin
+configuration. We discuss our finding from the symmetry point of view, in
+comparison with other spin current generator candidates with collinear
+antiferomagnetism. We also propose several ways to detect the phenomenon in
+candidate perovskite materials.",2011.12459v1
+2021-04-13,Theory of spin-Hall magnetoresistance in the AC (terahertz) regime,"In bilayers consisting of a normal metal (N) with spin-orbit coupling and a
+ferromagnet (F), the combination of the spin-Hall effect, the spin-transfer
+torque, and the inverse spin-Hall effect gives a small correction to the
+in-plane conductivity of N, which is referred to as spin-Hall magnetoresistance
+(SMR). We here present a theory of the SMR and the associated off-diagonal
+conductivity corrections for frequencies up to the terahertz regime. We show
+that the SMR signal has pronounced singularities at the spin-wave frequencies
+of F, which identifies it as a potential tool for all-electric spectroscopy of
+magnon modes. A systematic change of the magnitude of the SMR at lower
+frequencies is associated with the onset of a longitudinal magnonic
+contribution to spin transport across the F-N interface.",2104.06518v2
+2016-12-20,All-Electrical Generation of Spin-Polarized Currents in Quantum Spin Hall Insulators,"The control and generation of spin-polarized currents (SPCs) without magnetic
+materials and external magnetic field is a big challenge in spintronics and
+normally requires spin-flip mechanism. In this work, we propose a novel method
+to control and generate SPCs in stanene nanoribbons in the quantum spin Hall
+(QSH) insulator regime by all electrical means without spin-flip mechanism.
+This is achieved with intrinsic spin-orbit coupling in stanene nanoribbons by
+tuning the relative phase of spin up and down electrons using a gate voltage,
+which creates a time delay between them thereby producing alternative SPCs
+driven by ac voltage. The control and generation of SPCs are demonstrated
+numerically for ac transport in both transient and ac regime. Our results are
+robust against edge imperfections and generally valid for other QSH insulators
+such as silicene and germanene, etc. These findings establish a novel route for
+generating SPCs by purely electrical means and open the door for new
+applications of semiconductor spintronics.",1612.06629v1
+2020-03-09,Symmetric spin liquids on the stuffed honeycomb lattice,"We use a projective symmetry group analysis to determine all symmetric spin
+liquids on the stuffed honeycomb lattice Heisenberg model. This lattice
+interpolates between honeycomb, triangular and dice lattices, always preserving
+hexagonal symmetry, and it already has one spin liquid candidate, TbInO$_3$,
+albeit with strong spin-orbit coupling not considered here. In addition to the
+stuffed honeycomb lattice itself, we gain valuable insight into potential spin
+liquids on the honeycomb and triangular lattices, as well as how they might be
+connected. For example, the sublattice pairing state proposed on the honeycomb
+lattice connects to the uniform spinon Fermi surface that may be relevant for
+the triangular lattice with ring exchange, while there are no spin liquids
+competitive on both the $J_1-J_2$ honeycomb and triangular lattice limits. In
+particular, we find three stuffed honeycomb descendants of the U(1) Dirac spin
+liquid widely believed to be found on the $J_1-J_2$ triangular lattice. We also
+discuss how spin liquids near the honeycomb limit can potentially explain the
+physics of LiZn$_2$Mo$_3$O$_8$.",2003.04269v1
+2020-09-18,Spin-momentum locking induced non-local voltage in topological insulator nanowire,"The momentum and spin of charge carriers in the topological insulators are
+constrained to be perpendicular to each other due to the strong spin-orbit
+coupling. We have investigated this unique spin-momentum locking property in
+Sb2Te3 topological insulator nanowires by injecting spin-polarized electrons
+through magnetic tunnel junction electrodes. Non-local voltage measurements
+exhibit a symmetry with respect to the magnetic field applied perpendicular to
+the nanowire channel, which is remarkably different from that of a non-local
+measurement in a channel that lacks spin-momentum locking. In stark contrast to
+conventional non-local spin valves, simultaneous reversal of magnetic moments
+of all magnetic contacts to the Sb2Te3 nanowire alters the non-local voltage.
+This unusual symmetry is a clear signature of the spin-momentum locking in the
+Sb2Te3 nanowire surface states.",2009.09091v1
+2021-01-08,Chirality Induced Spin Coherence in Electron Transfer Reactions,"Recently there has been much interest in the chirality induced spin
+selectivity effect, whereby electron spin polarisation, which is dependent on
+the molecular chirality, is produced in electrode-molecule electron transfer
+processes. Naturally, one might consider if a similar effect can be observed in
+simple molecular charge transfer reactions, for example in light-induced
+electron transfer from an electron donor to an electron acceptor. In this work
+we explore the effect of electron transfer on spins in chiral single radicals
+and chiral radical pairs using Nakajima-Zwanzig theory. In these cases
+chirality, in conjuction with spin-orbit coupling, does not lead to spin
+polarisation, but instead the electron transfer generates quantum coherence
+between spins states. In principle, this chirality induced spin coherence could
+manifest in a range of experiments, and in particular we demonstrate that the
+OOP-ESEEM pulse EPR experiment would be able to detect this effect in oriented
+radical pairs.",2101.03104v1
+2021-03-01,Electron-induced nuclear magnetic ordering in n-type semiconductors,"Nuclear magnetism in n-doped semiconductors with positive hyperfine constant
+is revisited. Two kinds of nuclear magnetic ordering can be induced by resident
+electrons in a deeply cooled nuclear spin system. At positive nuclear spin
+temperature below a critical value, randomly oriented nuclear spin polarons
+similar to that predicted by I. Merkulov [I. Merkulov, Physics of the Solid
+State 40, 930 (1998)] should emerge. These polarons are oriented randomly and
+within each polaron nuclear and electron spins are aligned
+antiferromagnetically. At negative nuclear spin temperature below a critical
+value we predict another type of magnetic ordering - dynamically induced
+nuclear ferromagnet. This is a long-range ferromagnetically ordered state
+involving both electrons and nuclei. It can form if electron spin relaxation is
+dominated by the hyperfine coupling, rather than by the spin-orbit interaction.
+Application of the theory to the n-doped GaAs suggests that the ferromagnetic
+order may be reached at experimentally achievable nuclear spin temperature
+$\Theta_N \approx 0.5$ $\mu$K and lattice temperature $T_L \approx 5$ K.",2103.01120v1
+2021-06-11,The origin of chirality induced spin selectivity in photo-induced electron transfer,"Here we propose a mechanism by which spin polarization can be generated
+dynamically in chiral molecular systems undergoing photo-induced electron
+transfer. The proposed mechanism explains how spin polarization emerges in
+systems where charge transport is dominated by incoherent hopping, mediated by
+spin orbit and electronic exchange couplings through an intermediate charge
+transfer state. We derive a simple expression for the spin polarization that
+predicts a non-monotonic temperature dependence consistent with recent
+experiments. We validate this theory using approximate quantum master equations
+and the numerically exact hierarchical equations of motion. The proposed
+mechanism of chirality induced spin selectivity should apply to many chiral
+systems, and the ideas presented here have implications for the study of spin
+transport at temperatures relevant to biology, and provide simple principles
+for the molecular control of spins in fluctuating environments.",2106.06554v1
+2021-07-07,Acoustic Rashba-Edelstein effect,"We theoretically study the mechanical induction of the spin density via the
+Rashba spin--orbit interaction (SOI). The spin density in the linear response
+to lattice distortion dynamics is calculated based on the microscopic theory.
+We reveal that there are two mechanisms of spin induction: one is the acoustic
+Edelstein effect (AEE) from the acceleration of the lattice dynamics and the
+other is caused by the Rashba spin--vorticity coupling (RSVC). We find that the
+AEE induces a more efficient spin-to-charge conversion in comparison with the
+conventional electric Edelstein effect. The induced spin density due to the
+RSVC is expressed as a Berry curvature-like quantity; therefore, it can be
+attributed to the spatial symmetry breaking due to the Rashba SOI. Our work
+demonstrates high-efficiency spin generation in Rashba systems.",2107.03115v1
+2021-07-21,Nonmonotonic quantum phase gathering in curved spintronic circuits,"Spin carriers propagating along quantum circuits gather quantum spin phases
+depending on the circuit's size, shape, and spin-orbit coupling (SOC) strength.
+These phases typically grow monotonically with the SOC strength, as found in
+Rashba quantum wires and rings. In this work we show that the spin-phase
+gathering can be engineered by geometric means, viz. by the geometric curvature
+of the circuits, to be non-monotonic. We demonstrate this peculiar property by
+using one-dimensional polygonal models where flat segments alternate with
+highly curved vertices. The complex interplay between dynamic and geometric
+spin-phase components -- triggered by a series of emergent spin degeneracy
+points -- leads to bounded, global spin phases. Moreover, we show that the
+particulars of the spin-phase gathering have observable consequences in the
+Aharonov-Casher conductance of Rashba loops, a connection that passed unnoticed
+in previous works.",2107.10192v4
+2021-09-21,Chiral Surface Wave propagation with Anomalous Spin-momentum Locking,"The ability to control the directionality of surface waves by manipulating
+its polarization has been of great significance for applications in spintronics
+and polarization-based optics. Surface waves with evanescent tails are found to
+possess an inherent in-plane transverse spin which is dependent on the
+propagation direction while an out-of-plane transverse spin does not naturally
+occur for surface waves and requires a specific surface design. Here, we
+introduce a new type of surface waves called chiral surface wave which has two
+transverse spins, an in-plane one that is inherent to any surface wave and an
+out-of-plane spin which is enforced by the design due to strong x-to-y coupling
+and broken rotational symmetry. The two transverse spins are locked to the
+momentum. Our study opens a new direction for metasurface designs with enhanced
+and controlled spin-orbit interaction by adding an extra degree of freedom to
+control the propagation direction as well as the transverse spin of surface
+waves.",2109.10314v1
+2021-12-22,Surface Cooper pair spin waves in triplet superconductors,"We study the electrodynamics of spin triplet superconductors including
+dipolar interactions, which give rise to an interplay between the collective
+spin dynamics of the condensate and orbital Meissner screening currents. Within
+this theory, we identify a class of spin waves that originate from the coupled
+dynamics of the spin-symmetry breaking triplet order parameter and the
+electromagnetic field. In particular, we study magnetostatic spin wave modes
+that are localized to the sample surface. We show that these surface modes can
+be excited and detected using experimental techniques such as microwave spin
+wave resonance spectroscopy or nitrogen-vacancy magnetometry, and propose that
+the detection of these modes offers a means for the identification of spin
+triplet superconductivity.",2112.12146v2
+2022-01-22,Elasto-Dynamical Induced Spin and Charge Pumping in Bulk Heavy Metals,"Analogous to the Spin-Hall Effect (SHE), {\it ab initio} electronic structure
+calculations reveal that acoustic phonons can induce charge (spin) current
+flowing along (normal to) its propagation direction. Using Floquet approach we
+have calculated the elastodynamical-induced charge and spin pumping in bulk Pt
+and demonstrate that: (i) While the longitudinal charge pumping is an intrinsic
+observable, the transverse pumped spin-current has an extrinsic origin that
+depends strongly on the electronic relaxation time; (ii) The longitudinal
+charge current
+  is of nonrelativstic origin, while the transverse spin current is a
+relativistic effect that to lowest order scales linearly with the spin-orbit
+coupling strength; (iii) both charge and spin pumped currents have parabolic
+dependence on the amplitude of the elastic wave.",2201.09121v1
+2022-03-10,Bulk photospin effect: Calculation of electric spin susceptibility to second order in an electric field,"We compute the electric spin susceptibility of Bloch electrons with
+spin-orbit coupling to second order. We find that it is possible to generate a
+nonequilibrium spin polarization in the bulk of non-magnetic
+inversion-symmetric materials using linearly polarized electric fields, but the
+process depends on interband coherence and produces heating. It may be possible
+to avoid heating with circular polarization in certain scenarios. The standard
+Edelstein effect and spin orientation effects are recovered in appropriate
+limits within the formalism. Finally, the electric spin susceptibility of
+metals has contributions proportional to spin multipole moments of the Fermi
+sea that dominate the low frequency spin response.",2203.05116v3
+2022-03-18,Datta-Das transistor for atomtronic circuits using artificial gauge fields,"Spin-dependent electrical injection has found useful applications in storage
+devices, but fully operational spin-dependent semiconductor electronics remain
+a challenging task because of weak spin-orbit couplings and/or strong spin
+relaxations. These limitations are lifted considering atoms instead of
+electrons or holes as spin carriers. In this emerging field of atomtronics, we
+demonstrate the equivalent of a Datta-Das transistor using a degenerate Fermi
+gas of strontium atoms as spin carriers in interaction with a tripod
+laser-beams scheme. We explore the dependence of spin rotation, and we identify
+two key control parameters which we interpret as equivalent to the gate-source
+and drain-source voltages of a field effect transistor. Our finding broadens
+the spectrum of atomtronics devices for implementation of operational
+spin-sensitive circuits.",2203.13360v2
+2022-04-27,Investigation of spin rotators in CEPC at the Z-pole,"Longitudinal polarization is an important design aspect of the future 100
+km-scale Circular Electron Position Collider (CEPC). Spin rotators are needed
+in CEPC collider rings to make the beam polarization along the longitudinal
+direction at the interaction points (IPs). This paper focuses on the design of
+spin rotators for CEPC at Z-pole (45.6 GeV). The design of spin rotators in
+CEPC at Z-pole is based on solenoid magnets and horizontal bending magnets
+sections. The coupling of transverse motion introduced by solenoids is
+compensated with quadrupole lenses. Adjustments have been made to the layout to
+implement the spin rotators into the collider rings.Longitudinal polarized beam
+can be achieved at the IPs with the spin rotators. High degree of polarization
+is attainable, while the effect of spin rotators on orbital motion is
+acceptable. The detailed simulation results will be presented.A solenoid-based
+spin rotator configuration is designed and integrated into the CEPC collider
+ring lattice. According to the simulation results, the polarization
+requirements can be satisfied.",2204.12664v2
+2022-08-10,"Ferrochiral, antiferrochiral, and ferrichiral skyrmion crystals in an itinerant honeycomb magnet","Topological spin textures, such as a skyrmion crystal, are a source of
+unusual physical phenomena owing to the interplay between magnetism and
+topology. Since physical phenomena depend on the topological property and the
+symmetry of underlying spin structures, the search for new topological spin
+textures and emergent phenomena is one of the challenges in condensed matter
+physics. In this letter, we theoretically explore new topological spin textures
+arising from the synergy between spin, charge, and sublattice degrees of
+freedom in an itinerant magnet. By performing simulated annealing for an
+effective spin model of the honeycomb Kondo lattice model, we find a plethora
+of skyrmion crystal instabilities at low temperatures, whose topological spin
+textures are classified into three types: ferrochiral, antiferrochiral, and
+ferrichiral skyrmion crystals. We show that the obtained skyrmion crystals are
+the consequence of the spin-orbit-coupling-free honeycomb structure. Our
+results reveal the potential for itinerant honeycomb magnets to host a wide
+variety of SkXs and emergent phenomena.",2208.05115v1
+2023-05-16,Antiferromagnetic spin fluctuations and unconventional superconductivity in topological superconductor candidate YPtBi revealed by $^{195}$Pt-NMR,"We report $^{195}$Pt nuclear magnetic resonance (NMR) measurements on
+topological superconductor candidate YPtBi which has the broken inversion
+symmetry and topological non-trivial band structures due to the strong
+spin-orbit coupling(SOC). In the normal state, we find that Knight shift $K$ is
+field- and temperature-independent, suggesting that the contribution from the
+topological bands is very small at low temperatures. However, the spin-lattice
+relaxation rate 1/$T_1$ divided by temperature ($T$), 1/$T_1T$, increases with
+decreasing $T$, implying the existence of antiferromagnetic spin fluctuations.
+In the superconducting state, no Hebel-Slichter coherence peak is seen below
+$T_{\rm c}$ and 1/$T_1$ follows $T^{3}$ variation, indicating the
+unconventional superconductivity. The finite spin susceptibility at
+zero-temperature limit and the anomalous increase of the NMR line width below
+$T_{\rm c}$ point to a mixed state of spin-singlet and spin-triplet(or
+spin-septet) pairing.",2305.09437v1
+2023-06-29,Non-equilibrium spin accumulation and magneto-conductance in chiral nanojunctions from density-functional $\&$ group theory,"It is theoretically well established that a spin-dependent electron
+transmission generally appears in chiral systems, even without magnetic
+components, as long as a strong spin-orbit coupling is present in some of its
+elements. However, how this translates into the so-called chirality-induced
+spin selectivity in experiments, where the system is taken out of equilibrium,
+is still debated. Aided by non-equilibrium DFT-based quantum transport
+calculations, here we show that, when spatial symmetries that forbid a finite
+spin polarization in equilibrium are broken, a \textit{net} spin accumulation
+appears at finite bias in an arbitrary two-terminal nanojunction. Furthermore,
+when a suitably magnetized detector is introduced in the system, the net spin
+accumulation, in turn, translates into a finite magneto-conductance. The
+symmetry prerequisites are mostly analogous to those for the spin polarization
+at any bias, with the vectorial nature given by the direction of magnetization.",2306.17312v1
+2023-09-05,Dynamics of anisotropic frustrated antiferromagnet Cs2CoBr4 in a spin-liquid regime,"Cs2CoBr4 is a triangular-lattice antiferromagnet which can be viewed as
+weakly interacting spin chains due to spatially anisotropic frustrating
+exchange couplings. The spin-orbit interaction in Co(2+) spin-3/2 ions leads to
+a strong easy-plane single-ion anisotropy which allows to consider the
+low-energy spin dynamics of this system using an anisotropic pseudospin-1/2
+model. By means of the electron spin resonance (ESR) technique, we study the
+spin dynamics of Cs2CoBr4 in magnetic field in a spin-liquid regime, i.e.,
+above the N'eel temperature of 1.3 K but below the temperature of the crossover
+to in-chain correlations of pseudospins (6 K). Our experiments reveal two
+bright branches of excitations which strongly differ both from excitations in
+the low-temperature ordered phases and from high-temperature paramagnetic
+resonance of uncorrelated pseudospins and spins. These two branches are
+interpreted as excitations with zero momentum of an anisotropic spin-1/2 chain.
+Besides, we observe several weak modes of unknown origin which arise mostly as
+satellites of one of the bright modes.",2309.02266v1
+2024-03-07,A generic model with unconventional Rashba bands and giant spin galvanic effect,"In two-dimensional system, Rashba spin-orbit coupling can lift spin
+degeneracy and gives the opposite spin chirality of two split Fermi circles
+from two Rashba bands. Here, we propose a generic model which can produce
+unconventional Rashba bands. In such a case, the two Fermi circles from two
+bands have the same spin chirality. When various interactions are taken into
+account, many unique physics can emerge in case of unconventional Rashba bands
+in comparison with in case of conventional Rashba bands. For instance, we study
+the spin galvanic effect by considering two cases with potential impurity
+scattering and magnetic impurity scattering, respectively. In both cases, we
+find the efficiency of spin galvanic effect is strongly enhanced in
+unconventional Rashba bands in comparison with conventional Rashba bands. More
+intriguingly, we find the effeiciency of conventional Rashba bands is
+insensitive to potential or magnetic impurity scattering. However, such
+efficiency of uncoventional Rashba bands can be further enhanced by the
+magnetic impurity scattering in comparison with the potential impurity
+scattering. Thus, the unconventional Rashba bands can give giant spin galvanic
+effect. These results show that this model is useful to explore abnormal
+physics in the systems with unconventional Rashba bands.",2403.04155v1
+2020-07-29,Infinite-layer nickelates as Ni-eg Hund's metals,"The recent and exciting discovery of superconductivity in the hole-doped
+infinite-layer nickelate Nd 1-{\delta} Sr {\delta} NiO 2 draws strong attention
+to correlated quantum materials. From a theoretical view point, this new class
+of unconventional superconducting materials provides an opportunity to unveil
+new physics in correlated quantum materials. Here we study the temperature and
+doping dependence of the local spectrum as well as the charge, spin and orbital
+susceptibilities from first principles. By using ab initio LQSGW+DMFT
+methodology, we show that onsite Hund's coupling in Ni-d orbitals gives rise to
+multiple signatures of Hund's metallic phase in Ni-eg orbitals. The proposed
+picture of the nickelates as an eg (two orbital) Hund's metal differs from the
+picture of the Fe-based superconductors as a five orbital Hund's metal as well
+as the picture of the cuprates as doped charge transfer insulators. Our finding
+unveils a new class of the Hunds metals and has potential implications for the
+broad range of correlated two orbital systems away from half-filling.",2007.14610v2
+2023-05-17,High orbital-moment Cooper pairs by crystalline symmetry breaking,"The pairing structure of superconducting materials is regulated by the point
+group symmetries of the crystal. Here, we study spin-singlet multiorbital
+superconductivity in materials with unusually low crystalline symmetry content
+and unveil the the appearance of even-parity (s-wave) Cooper pairs with high
+orbital moment. We show that the lack of mirror and rotation symmetries makes
+pairing states with quintet orbital angular momentum symmetry-allowed. A
+remarkable fingerprint of this type of pairing state is provided by a
+nontrivial superconducting phase texture in momentum space with $\pi$-shifted
+domains and walls with anomalous phase winding. The pattern of the quintet
+pairing texture is shown to depend on the orientation of the orbital
+polarization and the strength of the mirror and/or rotation symmetry breaking
+terms. Such momentum dependent phase makes Cooper pairs with net orbital
+component suited to design orbitronic Josephson effects. We discuss how an
+intrinsic orbital dependent phase can set out anomalous Josephson couplings by
+employing superconducting leads with nonequivalent breaking of crystalline
+symmetry.",2305.10039v1
+2023-11-20,Orbital Hall effect and topology on a two-dimensional triangular lattice: from bulk to edge,"We investigate a generalized multi-orbital tight-binding model on a
+triangular lattice, a system prevalent in a wide range of two-dimensional
+materials, and particularly relevant for simulating transition metal
+dichalcogenide monolayers. We show that the interplay between spin-orbit
+coupling and different symmetry-breaking mechanisms leads to the emergence of
+four distinct topological phases [Eck, P., \textit{et al.}, Phys. Rev. B, 107
+(11), 115130 (2023)]. Remarkably, this interplay also triggers the orbital Hall
+effect with distinguished characteristics. Furthermore, by employing the
+Landauer-B\""uttiker formula, we establish that in the orbital Hall insulating
+phase, the orbital angular momentum is carried by edge states present in
+nanoribbons with specific terminations. We also show that, as expected, they do
+not have topological protection against the disorder of the edge states
+belonging to a first-order topological insulator.",2311.11715v1
+2023-11-20,Orbital Kerr effect and terahertz detection via the nonlinear Hall effect,"We investigate the optical response induced by a d.c. current flowing in a
+nonmagnetic material that lacks inversion symmetry. In this class of materials,
+the flowing current experiences a nonlinear Hall effect and induces a
+nonequilibrium orbital magnetization, even in the absence of spin-orbit
+coupling. As a result, an orbital-driven Kerr effect arises that can be used to
+probe not only the orbital magnetization, but also the nonlinear Hall effect.
+In addition, in the long wavelength limit, the nonlinear Hall effect leads to a
+rectification current that can be used to detect terahertz radiation. We apply
+the theory to selected model systems, such as WTe$_2$ bilayer, as well as to
+realistic materials, i.e., bulk Te and metallic superlattices. The
+nonequilibrium orbital Kerr efficiencies obtained in these systems are
+comparable to the largest values reported experimentally in GaAs and MoS$_2$,
+exceeding the values reported in metals and suggesting a large terahertz
+current responsivity.",2311.11889v1
+2023-03-29,Strong coupling between a microwave photon and a singlet-triplet qubit,"Tremendous progress in few-qubit quantum processing has been achieved lately
+using superconducting resonators coupled to gate voltage defined quantum dots.
+While the strong coupling regime has been demonstrated recently for odd charge
+parity flopping mode spin qubits, first attempts towards coupling a resonator
+to even charge parity singlet-triplet spin qubits have resulted only in weak
+spin-photon coupling strengths. Here, we integrate a zincblende InAs nanowire
+double quantum dot with strong spin-orbit interaction in a magnetic-field
+resilient, high-quality resonator. In contrast to conventional strategies, the
+quantum confinement is achieved using deterministically grown wurtzite tunnel
+barriers without resorting to electrical gating. Our experiments on even charge
+parity states and at large magnetic fields, allow to identify the relevant spin
+states and to measure the spin decoherence rates and spin-photon coupling
+strengths. Most importantly, we find an anti-crossing between the resonator
+mode in the single photon limit and a singlet-triplet qubit with an electron
+spin-photon coupling strength of $g/2\pi=139\pm4$ MHz. Combined with the
+resonator decay rate $\kappa/2\pi=19.8\pm0.2$ MHz and the qubit dephasing rate
+$\gamma/2\pi=116\pm7$ MHz, our system achieves the strong coupling regime in
+which the coherent coupling exceeds qubit and resonator linewidth. These
+results pave the way towards large-scale quantum system based on
+singlet-triplet qubits.",2303.16825v2
+2021-04-21,Electronic Structure of Mononuclear Cu-based Molecule from Density-Functional Theory with Self-Interaction Correction,"We investigate the electronic structure of a planar mononuclear Cu-based
+molecule [Cu(C$_6$H$_4$S$_2$)$_2$]$^z$ in two oxidation states ($z$$=$$-2$,
+$-$1) using density-functional theory (DFT) with Fermi-L\""owdin orbital (FLO)
+self-interaction correction (SIC). The dianionic Cu-based molecule was proposed
+to be a promising qubit candidate. Self-interaction error within approximate
+DFT functionals renders severe delocalization of electron and spin densities
+arising from 3$d$ orbitals. The FLO-SIC method relies on optimization of
+Fermi-L\""owdin orbital descriptors (FODs) with which localized occupied
+orbitals are constructed to create the SIC potentials. Starting with many
+initial sets of FODs, we employ a frozen-density loop algorithm within the
+FLO-SIC method to study the Cu-based molecule. We find that the electronic
+structure of the molecule remains unchanged despite somewhat different final
+FOD configurations. In the dianionic state (spin $S=1/2$), FLO-SIC spin density
+originates from the Cu $d$ and S $p$ orbitals with an approximate ratio of 2:1,
+in quantitative agreement with multireference calculations, while in the case
+of SIC-free DFT, the orbital ratio is reversed. Overall, FLO-SIC lowers the
+energies of the occupied orbitals and in particular the 3$d$ orbitals
+unhybridized with the ligands significantly, which substantially increases the
+energy gap between the highest occupied molecular orbital (HOMO) and the lowest
+unoccupied molecular orbital (LUMO) compared to SIC-free DFT results. The
+FLO-SIC HOMO-LUMO gap of the dianionic state is larger than that of the
+monoionic state, which is consistent with experiment. Our results suggest a
+positive outlook of the FLO-SIC method in the description of magnetic exchange
+coupling within 3$d$-element based systems.",2104.10327v1
+2007-10-17,The final spin from the coalescence of aligned-spin black-hole binaries,"Determining the final spin of a black-hole (BH) binary is a question of key
+importance in astrophysics. Modelling this quantity in general is made
+difficult by the fact that it depends on the 7-dimensional space of parameters
+characterizing the two initial black holes. However, in special cases, when
+symmetries can be exploited, the description can become simpler. For black-hole
+binaries with unequal masses but with equal spins which are aligned with the
+orbital angular momentum, we show that the use of recent simulations and basic
+but exact constraints derived from the extreme mass-ratio limit allow to model
+this quantity with a simple analytic expression. Despite the simple dependence,
+the expression models very accurately all of the available estimates, with
+errors of a couple of percent at most. We also discuss how to use the fit to
+predict when a Schwarzschild BH is produced by the merger of two spinning BHs,
+when the total angular momentum of the spacetime ``flips'' sign, or under what
+conditions the final BH is ``spun-up'' by the merger. Finally, suggest an
+extension of the fit to include unequal-spin binaries, thus potentially
+providing a complete description of the final spin from the coalescence of
+generic black-hole binaries with spins aligned to the orbital angular momentum.",0710.3345v3
+2020-02-05,Spin Resonances in Iron-Selenide High-Tc Superconductors by Proximity to Hidden Spin Density Wave,"Recent inelastic neutron scattering studies by Pan et al., Nature
+Communications 8, 123 (2017), find evidence for spin excitations at energies
+above the quasi-particle gap in an iron-selenide high-Tc superconductor. The
+momenta of the spin excitations form a diamond around the checkerboard
+wavevector, Q_AF, that is associated with the square lattice of iron atoms that
+makes up the system. It has been suggested that such a ""hollowed-out""
+spin-excitation spectrum is due to hidden Neel order. We study such a hidden
+spin-density wave (hSDW) state that results from nested Fermi surfaces at the
+center and at the corner of the unfolded Brillouin zone. It emerges within mean
+field theory from an extended Hubbard model over a square lattice of iron atoms
+that contain the minimal d_xz and d_yz orbitals. Opposing Neel order exists
+over the isotropic d+ = d_xz + i d_yz and d- = d_xz - i d_yz orbitals. The
+dynamical spin susceptibility of the hSDW is computed within the random phase
+approximation, at perfect nesting. Unobservable Goldstone modes that disperse
+acoustically are found at Q_AF. A threshold is found in the spectrum of
+observable spin excitations that forms a ""floating ring"" at Q_AF also. The ring
+threshold moves down in energy toward zero with increasing Hund's Rule
+coupling, while it moves up in energy with increasing magnetic frustration.
+Comparison with the normal-state features of the spin-excitation spectrum shown
+by electron-doped iron selenide is made. Also, recent predictions of a Lifshitz
+transition from the nested Fermi surfaces to Fermi surface pockets at the
+corner of the folded Brillouin zone will be discussed.",2002.01732v2
+2020-10-20,Determination of the spin axis in quantum spin Hall insulator monolayer WTe2,"Evidence for the quantum spin Hall (QSH) effect has been reported in several
+experimental systems in the form of approximately quantized edge conductance.
+However, the most fundamental feature of the QSH effect, spin-momentum locking
+in the edge channels, has never been demonstrated experimentally. Here, we
+report clear evidence for spin-momentum locking in the edge channels of
+monolayer WTe2, thought to be a two-dimensional topological insulator (2D TI).
+We observe that the edge conductance is controlled by the component of an
+applied magnetic field perpendicular to a particular axis, which we identify as
+the spin axis. The axis is the same for all edges, situated in the mirror plane
+perpendicular to the tungsten chains at 40$\pm$2{\deg} to the layer normal,
+implying that the spin-orbit coupling is inherited from the bulk band
+structure. We show that this finding is consistent with theory if the band-edge
+orbitals are taken to have like parity. We conclude that this parity assignment
+is correct and that both edge states and bulk bands in monolayer WTe2 share the
+same simple spin structure. Combined with other known features of the edge
+states this establishes spin-momentum locking, and therefore that monolayer
+WTe2 is truly a natural 2D TI.",2010.09986v2
+2022-10-05,Modifications of Tanabe-Sugano d$^6$ diagram induced by radical ligand field: ab initio inspection of a Fe(II)-verdazyl molecular complex,"Quantum entanglement between the spin states of a metal centre and radical
+ligands is suggested in an iron(II) [Fe(dipyvd)$_2$]$^{2+}$ compound (dipyvd =
+1-isopropyl-3,5-dipyridil-6-oxoverdazyl). Wavefunction \textit{ab initio}
+(Difference Dedicated Configuration Interaction, DDCI) inspections were carried
+out to stress the versatility of local spin states. We named this phenonmenon
+\textit{excited state spinmerism}, in reference to our previous work (see
+Roseiro et. al., ChemPhysChem 2022, e202200478) where we introduced the concept
+of spinmerism as an extension of mesomerism to spin degrees of freedom. The
+construction of localized molecular orbitals allows for a reading of the
+wavefunctions and projections onto the local spin states. The low-energy
+spectrum is well-depicted by a Heisenberg picture. A 60 cm$^{-1}$ ferromagnetic
+interaction is calculated between the radical ligands with the $S_{total} = 0$
+and $1$ states largely dominated by a local low-spin $S_{Fe} = 0$. In contrast,
+the higher-lying $S_{total} = 2$ states are superpositions of the local $S_{Fe}
+= 1$ (17%, 62%) and $S_{Fe} = 2$ (72%, 21%) spin states. Such mixing extends
+the traditional picture of a high-field $d^6$ Tanabe-Sugano diagram. Even in
+the absence of spin-orbit coupling, the avoided crossing between different
+local spin states is triggered by the field generated by radical ligands. This
+puzzling scenario emerges from versatile local spin states in compounds which
+extend the traditional views in molecular magnetism.",2210.02325v2
+2022-11-16,Emergence of large spin-charge interconversion at an oxidized Cu/W interface,"Spin-orbitronic devices can integrate memory and logic by exploiting
+spin-charge interconversion (SCI), which is optimized by design and materials
+selection. In these devices, such as the magnetoelectric spin-orbit (MESO)
+logic, interfaces are crucial elements as they can prohibit or promote spin
+flow in a device as well as possess spin-orbit coupling resulting in
+interfacial SCI. Here, we study the origin of SCI in a Py/Cu/W lateral spin
+valve and quantify its efficiency. An exhaustive characterization of the
+interface between Cu and W electrodes uncovers the presence of an oxidized
+layer (WO$_x$). We determine that the SCI occurs at the Cu/WO$_x$ interface
+with a temperature-independent interfacial spin-loss conductance of $G_{||}
+\approx$ 20 $\times$ 10$^{13} \Omega^{-1}m^{-2}$ and an interfacial spin-charge
+conductivity $\sigma_{SC}=-$1610 $\Omega^{-1}cm^{-1}$ at 10 K ($-$830
+$\Omega^{-1}cm^{-1}$ at 300 K). This corresponds to an efficiency given by the
+inverse Edelstein length $\lambda_{IEE}=-$0.76 nm at 10 K ($-$0.4 nm at 300 K),
+which is remarkably larger than in metal/metal and metal/oxide interfaces and
+bulk heavy metals. The large SCI efficiency at such an oxidized interface is a
+promising candidate for the magnetic readout in MESO logic devices.",2211.09250v1
+2023-04-28,Interplay of electron-magnon scattering and spin-orbit induced electronic spin-flip fcattering in a two-band Stoner model,"Magnons are one of the carriers of angular momentum that are involved in the
+ultrafast magnetization dynamics in ferromagnets, but their contribution to the
+electronic dynamics and their interplay with other scattering process that
+occur during ultrafast demagnetization has not yet been studied in the
+framework of a microscopic dynamical model. The present paper presents such an
+investigation of electronic scattering dynamics in itinerant ferromagnets at
+the level of Boltzmann scattering integrals for the magnon distributions and
+spin-dependent electron distributions. In addition to electron-magnon
+scattering, we include spin-conserving and effective Elliott-Yafet like
+spin-flip electron-electron scattering processes and the influence of phonons.
+In our model system, the creation or annihilation of magnons leads to
+transitions between two spin-split electronic bands with energy and momentum
+conservation. Due to the presence of spin-orbit coupling, Coulomb scattering
+transitions between these bands are also possible, and we describe them on an
+equal footing in terms of Boltzmann scattering integrals. For an instantaneous
+carrier excitation process we analyze the influence of both interaction
+processes on the magnon and spin-dependent electron dynamics, and show that
+their interplay gives rise to an efficient creation of magnons at higher
+energies and wave vectors accompanied by only a small increase of the
+electronic spin polarization. These results present a microscopic dynamical
+scenario that shows how non-equilibrium magnons may dominate the magnetic
+response of a ferromagnet on ultrafast timescales.",2304.14978v1
+2008-11-23,Spectral properties of orbital polarons in Mott insulators,"We address the spectral properties of Mott insulators with orbital degrees of
+freedom, and investigate cases where the orbital symmetry leads to Ising-like
+superexchange in the orbital sector. The paradigm of a hole propagating by its
+coupling to quantum fluctuations, known from the spin t-J model, then no longer
+applies. We find instead that when one of the two orbital flavors is immobile,
+as in the Falicov-Kimball model, trapped orbital polarons coexist with free
+hole propagation emerging from the effective three-site hopping in the regime
+of large on-site Coulomb interaction U. The spectral functions are found
+analytically in this case within the retraceable path approximation in one and
+two dimensions. On the contrary, when both of the orbitals are active, as in
+the model for $t_{2g}$ electrons in two dimensions, we find propagating
+polarons with incoherent scattering dressing the moving hole and renormalizing
+the quasiparticle dispersion. Here, the spectral functions, calculated using
+the self-consistent Born approximation, are anisotropic and depend on the
+orbital flavor. Unbiased conclusions concerning the spectral properties are
+established by comparing the above results for the orbital t-J models with
+those obtained using the variational cluster approximation or exact
+diagonalization for the corresponding Hubbard models. The present work makes
+predictions concerning the essential features of photoemission spectra of
+certain fluorides and vanadates.",0811.3763v1
+2013-06-07,Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors,"The bad metal behavior in the normal state of the iron-based superconductors
+suggests an intimate connection between the superconductivity and a proximity
+to a Mott transition. At the same time, there is strong evidence for the
+multi-orbital nature of the electronic excitations. It is then important to
+understand the orbital-dependent effects of electron correlations. In this
+paper we review the recent theoretical progresses on the metal-to-insulator
+transition in multiorbital models for the iron-based superconductors. These
+include studies of models that contain at least the 3d xy and 3d xz/yz models,
+using a slave-spin technique. For commensurate filling corresponding to that of
+the parent iron pnictides and chalcogenideds, a Mott transition generally
+exists in all these models. Near the Mott transition, a strongly correlated
+metal exhibiting bad metal features and strong orbital selectivity is
+stabilized due to the interplay of Hund's coupling and orbital-degeneracy
+breaking. Particularly for the alkaline iron selenides, the ordered vacancies
+effectively reduce the kinetic energy, thereby pushing the system further into
+the Mott-insulating regime; in the metallic state, there exists an
+orbital-selective Mott phase in which the iron 3d xy orbital is Mott localized
+while the other 3d orbitals are still itinerant. An overall phase diagram for
+the alkaline iron selenides has been proposed, in which the orbital-selective
+Mott phase connects between the superconducting phase and the Mott-insulating
+parent state.",1306.1697v1
+2023-03-08,Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV$_3$Sb$_5$,"The recently discovered kagome materials $A$V$_3$Sb$_5$ ($A$ = K, Rb, Cs)
+attract intense research interest in intertwined topology, superconductivity,
+and charge density waves (CDW). Although the in-plane $2\times2$ CDW is well
+studied, its out-of-plane structural correlation with the Fermi surface
+properties is less understood. In this work, we advance the theoretical
+description of quantum oscillations and investigate the Fermi surface
+properties in the three-dimensional CDW phase of CsV$_3$Sb$_5$. We derived
+Fermi-energy-resolved and layer-resolved quantum orbits that agree
+quantitatively with recent experiments in the fundamental frequency, cyclotron
+mass, and topology. We reveal a complex Dirac nodal network that would lead to
+a $\pi$ Berry phase of a quantum orbit in the spinless case. However, the phase
+shift of topological quantum orbits is contributed by the orbital moment and
+Zeeman effect besides the Berry phase in the presence of spin-orbital coupling
+(SOC). Therefore, we can observe topological quantum orbits with a $\pi$ phase
+shift in otherwise trivial orbits without SOC, contrary to common perception.
+Our work reveals the rich topological nature of kagome materials and paves a
+path to resolve different topological origins of quantum orbits.",2303.04924v1
+2012-08-14,Unpaired Floquet Majorana fermions without magnetic fields,"Quantum wires subject to the combined action of spin-orbit and Zeeman
+coupling in the presence of \emph{s}-wave pairing potentials (superconducting
+proximity effect in semiconductors or superfluidity in cold atoms) are one of
+the most promising systems for the developing of topological phases hosting
+Majorana fermions. The breaking of time-reversal symmetry is essential for the
+appearance of unpaired Majorana fermions. By implementing a
+\emph{time-dependent} spin rotation, we show that the standard magnetostatic
+model maps into a \emph{non-magnetic} one where the breaking of time-reversal
+symmetry is guaranteed by a periodical change of the spin-orbit coupling axis
+as a function of time. This suggests the possibility of developing the
+topological superconducting state of matter driven by external forces in the
+absence of magnetic fields and magnetic elements. From a practical viewpoint,
+the scheme avoids the disadvantages of conjugating magnetism and
+superconductivity, even though the need of a high-frequency driving of
+spin-orbit coupling may represent a technological challenge. We describe the
+basic properties of this Floquet system by showing that finite samples host
+unpaired Majorana fermions at their edges despite the fact that the bulk
+Floquet quasienergies are gapless and that the Hamiltonian at each instant of
+time preserves time-reversal symmetry. Remarkably, we identify the mean energy
+of the Floquet states as a topological indicator. We additionally show that the
+localized Floquet Majorana fermions are robust under local perturbations. Our
+results are supported by complementary numerical Floquet simulations.",1208.2742v4
+2015-01-28,Very large magnetoresistance in Fe$_{0.28}$TaS$_{2}$ single crystals,"Magnetic moments intercalated into layered transition metal dichalcogenides
+are an excellent system for investigating the rich physics associated with
+magnetic ordering in a strongly anisotropic, strong spin-orbit coupling
+environment. We examine electronic transport and magnetization in
+Fe$_{0.28}$TaS$_{2}$, a highly anisotropic ferromagnet with a Curie temperature
+$T_{\mathrm{C}} \sim 68.8~$K. We find anomalous Hall data confirming a
+dominance of spin-orbit coupling in the magnetotransport properties of this
+material, and a remarkably large field-perpendicular-to-plane MR exceeding 60%
+at 2 K, much larger than the typical MR for bulk metals, and comparable to
+state-of-the-art GMR in thin film heterostructures, and smaller only than CMR
+in Mn perovskites or high mobility semiconductors. Even within the
+Fe$_x$TaS$_2$ series, for the current $x$ = 0.28 single crystals the MR is
+nearly $100\times$ higher than that found previously in the commensurate
+compound Fe$_{0.25}$TaS$_{2}$. After considering alternatives, we argue that
+the large MR arises from spin disorder scattering in the strong spin-orbit
+coupling environment, and suggest that this can be a design principle for
+materials with large MR.",1501.07295v1
+2015-05-25,Quantum Dynamical Phase Transition in a Spin-Orbit Coupled Bose Condensate,"Spin-orbit coupled bosons can exhibit rich equilibrium phases at low
+temperature and in the presence of particle-particle interactions. In the case
+with a 1D synthetic spin-orbit interaction, it has been observed that the
+ground state of a Bose gas can be a normal phase, stripe phase, or magnetized
+phase in different experimentally controllable parameter regimes. The
+magnetized states are doubly degenerate and consist of a many-particle
+two-state system. In this work, we investigate the nonequilibrium quantum
+dynamics by switching on an external perturbation to induce resonant couplings
+between the magnetized phases, and predict the novel quantum spin dynamics
+which cannot be obtained in the single-particle systems. In particular, due to
+particle-particle interactions, the transition of the Bose condensate from one
+magnetized phase to the other is forbidden when the strength of external
+perturbation is less than a critical value, and a full transition can occur
+only when the perturbation exceeds such critical strength. This phenomenon
+manifests itself a quantum dynamical phase transition, with the critical point
+behavior being exactly solvable. From the numerical simulations and exact
+analytic studies we show that the predicted many-body effects can be well
+observed with the current experiments.",1505.06687v1
+2015-09-28,Influence of Rashba spin-orbit coupling on the Kondo effect,"An Anderson model for a magnetic impurity in a two-dimensional electron gas
+with bulk Rashba spin-orbit interaction is solved using the numerical
+renormalization group under two different experimental scenarios. For a fixed
+Fermi energy, the Kondo temperature T_K varies weakly with Rashba coupling
+\alpha, as reported previously. If instead the band filling is low and held
+constant, increasing \alpha can drive the system into a helical regime with
+exponential enhancement of T_K. Under either scenario, thermodynamic properties
+at low temperatures T exhibit the same dependences on T/T_K as are found for
+\alpha = 0. Unlike the conventional Kondo effect, however, the impurity
+exhibits static spin correlations with conduction electrons of nonzero orbital
+angular momentum about the impurity site. We also consider a magnetic field
+that Zeeman splits the conduction band but not the impurity level, an effective
+picture that arises under a proposed route to access the helical regime in a
+driven system. The impurity contribution to the system's ground-state angular
+momentum is found to be a universal function of the ratio of the Zeeman energy
+to a temperature scale that is not T_K (as would be the case in a magnetic
+field that couples directly to the impurity spin), but rather is proportional
+to T_K divided by the impurity hybridization width. This universal scaling is
+explained via a perturbative treatment of field-induced changes in the
+electronic density of states.",1509.08433v2
+2016-04-01,"On magnetic monopoles, the anomalous g-factor of the electron and the spin-orbit coupling in the Dirac theory","We discuss the algebra and the interpretation of the anomalous Zeeman effect
+and the spin-orbit coupling within the Dirac theory. Whereas the algebra for
+the anomalous Zeeman effect is impeccable and therefore in excellent agreement
+with experiment, the physical interpretation of that algebra uses images that
+are based on macroscopic intuition but do not correspond to the meaning of this
+algebra. The interpretation violates the Lorentz symmetry. We give an
+alternative intuitive description of the meaning of this effect, which respects
+the symmetry and is exact. It can be summarized by stating that a magnetic
+field makes any charged particle spin. We show also that the traditional
+discussion about magnetic monopoles confuses two issues, viz. the symmetry of
+the Maxwell equations and the quantization of charge. These two issues define
+each a different concept of magnetic monopole. They cannot be merged together
+into a unique all-encompassing issue. We also generalize the minimal
+substitution for a charged particle, and provide some intuition for the
+magnetic vector potential. We finally explore the algebra of the spin-orbit
+coupling, which turns out to be badly wrong. The traditional theory that is
+claimed to reproduce the Thomas half is based on a number of errors. An
+error-free application of the Dirac theory cannot account for the Thomas
+precession, because it only accounts for the instantaneous local boosts, not
+for the rotational component of the Lorentz transformation. This runs contrary
+to established beliefs, but Thomas precession can be understood in terms of the
+Berry phase on a path through the velocity space of the Lorentz group manifold.
+These results clearly reveal the limitations of the prevailing working
+philosophy to ""shut up and calculate"".",1604.05160v1
+2016-09-18,Correlation and transport phenomena in topological nodal-loop semimetals,"We study the unique physical properties of topological nodal-loop semimetals
+protected by the coexistence of time-reversal and inversion symmetries with
+negligible spin-orbit coupling. We argue that strong correlation effects occur
+at the surface of such systems for relatively small Hubbard interaction $U$,
+due to the narrow bandwidth of the ""drumhead"" surface states. In the
+Hartree-Fock approximation, at small $U$ we obtain a surface ferromagnetic
+phase through a continuous quantum phase transition characterized by the
+surface-mode divergence of the spin susceptibility, while the bulk states
+remain very robust against local interactions and remain non-ordered. At
+slightly increased interaction strength, the system quickly changes from a
+surface ferromagnetic phase to a surface charge-ordered phase through a
+first-order transition. When Rashba-type spin-orbit coupling is applied to the
+surface states, a canted ferromagnetic phase occurs at the surface for
+intermediate values of $U$. The quantum critical behavior of the surface
+ferromagnetic transition is nontrivial in the sense that the surface spin order
+parameter couple to Fermi-surface excitations from both surface and bulk
+states. This leads to unconventional Landau damping and consequently a na\""ive
+dynamical critical exponent $z\!\approx\!1$ when the Fermi level is close to
+the bulk nodal energy. We also show that, already without interactions, quantum
+oscillations arise due to bulk states, despite the absence of a Fermi surface
+when the chemical potential is tuned to the energy of the nodal loop. The bulk
+magnetic susceptibility diverges logarithmically whenever the nodal loop
+exactly overlaps with a quantized magnetic orbit in the bulk Brillouin zone.
+These correlation and transport phenomena are unique signatures of nodal loop
+states.",1609.05529v1
+2020-07-03,Enhanced transport of spin-orbit coupled Bose gases in disordered potentials,"Anderson localization is a single particle localization phenomena in
+disordered media that is accompanied by an absence of diffusion. Spin-orbit
+coupling (SOC) describes an interaction between a particle's spin and its
+momentum that directly affects its energy dispersion, for example creating
+dispersion relations with gaps and multiple local minima. We show theoretically
+that combining one-dimensional spin-orbit coupling with a transverse Zeeman
+field suppresses the effects of disorder, thereby increasing the localization
+length and conductivity. This increase results from a suppression of back
+scattering between states in the gap of the SOC dispersion relation. Here, we
+focus specifically on the interplay of disorder from an optical speckle
+potential and SOC generated by two-photon Raman processes in quasi-1D
+Bose-Einstein condensates. We first describe back-scattering using a Fermi's
+golden rule approach, and then numerically confirm this picture by solving the
+time-dependent 1D Gross Pitaevskii equation for a weakly interacting
+Bose-Einstein condensate with SOC and disorder. We find that on the 10's of
+millisecond time scale of typical cold atom experiments moving in harmonic
+traps, initial states with momentum in the zero-momentum SOC gap evolve with
+negligible back-scattering, while without SOC these same states rapidly
+localize.",2007.01479v1
+2019-01-21,$η$-pairing in correlated fermion models with spin-orbit coupling,"We generalize the $\eta$-pairing theory in Hubbard models to the ones with
+spin-orbit coupling (SOC) and obtain the conditions under which the
+$\eta$-pairing operator is an eigenoperator of the Hamiltonian. The $\eta$
+pairing thus reveals an exact $SU(2)$ pseudospin symmetry in our spin-orbit
+coupled Hubbard model, even though the $SU(2)$ spin symmetry is explicitly
+broken by the SOC. In particular, these exact results can be applied to a
+variety of Hubbard models with SOC on either bipartite or non-bipartite
+lattices, whose noninteracting limit can be a Dirac semimetal, a Weyl
+semimetal, a nodal-line semimetal, and a Chern insulator. The $\eta$ pairing
+conditions also impose constraints on the band topology of these systems. We
+then construct and focus on an interacting Dirac-semimetal model, which
+exhibits an exact pseudospin symmetry with fine-tuned parameters. The stability
+regions for the exact $\eta$-pairing ground states (with momentum $\bm{\pi}$ or
+$\bm{0}$) and the exact charge-density-wave ground states are established.
+Between these distinct symmetry-breaking phases, there exists an exactly
+solvable multicritical line. In the end, we discuss possible experimental
+realizations of our results.",1901.06914v4
+2019-03-12,Spin-orbit coupled polariton condensates in a radially-periodic potential: Multiring vortices and rotating solitons,"We address evolution of a spinor polariton condensate in radially periodic
+potentials. Such potentials allow for the observation of novel nonlinear
+excitations and support a variety of dynamically stable soliton states never
+demonstrated before in polariton condensates, including ring-like solitons with
+density peaks located in different radial minima of the potential and extended
+dynamically stable multiring patterns. Among the advantages of the system is
+that azimuthal modulational instabilities are suppressed due to dominating
+repulsive interactions between polaritons with the same spin, thereby allowing
+for the stabilization of radially-symmetric states. The representative feature
+of this system is that spin-orbit coupling between different spinor components
+requires them to carry different topological charges. Radially-symmetric states
+carrying different combinations of topological charges are discussed. Radially
+symmetric potentials also support stable rotating multipeaked solitons, whose
+properties unexpectedly depend not only on the magnitude of the rotation
+velocity, but also on its sign, i.e., on the rotation direction. The latter
+property is a consequence of spin-orbit coupling which breaks the equivalence
+between clockwise and counterclockwise rotations. The multiring structures are
+shown to be robust against unavoidable losses and are therefore amenable to
+observations with the presently available experimental techniques.",1903.04885v1
+2021-04-27,"Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism","We study the ground state of the Hubbard model on a square lattice with two
+degenerate orbitals per site and at integer fillings as a function of onsite
+Hubbard repulsion $U$ and Hund's intra-atomic exchange coupling $J$. We use a
+variational slave-spin mean field (VSSMF) method which allows symmetry broken
+states to be studied within the computationally less intensive slave-spin mean
+field formalism, thus making the method more powerful to study strongly
+correlated electron physics. The results show that at half-filling, the ground
+state at smaller $U$ is a Slater antiferromagnet (AF) with substantial local
+charge fluctuations. As $U$ is increased, the AF state develops a Heisenberg
+behavior, finally undergoing a first order transition to a Mott insulating AF
+state at a critical interaction $U_c$ which is of the order of the bandwidth.
+Introducing the Hund's coupling $J$ correlates the system more and reduces
+$U_c$ drastically. At quarter-filling with one electron per site, the ground
+state at smaller $U$ is paramagnetic metallic. At finite Hund's coupling $J$,
+as interaction is increased above a lower critical value $U_{c1}$, it goes to a
+fully spin polarized ferromagnetic state coexisting with an antiferro-orbital
+order. The system eventually becomes Mott insulating at a higher critical value
+$U_{c2}$. The results as a function of $U$ and $J$ are thoroughly discussed.",2104.13027v1
+2015-08-20,Metal-Insulator Transitions and non-Fermi Liquid Behaviors in 5d Perovskite Iridates,"Transition metal oxides, in particular, 3d or 4d perovskites have provided
+diverse emergent physics that originates from the coupling of various degrees
+of freedom such as spin, lattice, charge, orbital, and also disorder. 5d
+perovskites form a distinct class because they have strong spin-orbit coupling
+that introduces to the system an additional energy scale that is comparable to
+bandwidth and Coulomb correlation. Consequent new physics includes novel Jeff =
+1/2 Mott insulators, metal-insulator transitions, spin liquids, and topological
+insulators. After highlighting some of the phenomena appearing in
+Ruddlesden-Popper iridate series Srn+1IrnO3n+1, we focus on the transport
+properties of perovskite SrIrO3. Using epitaxial thin films on various
+substrates, we demonstrate that metal-insulator transitions can be induced in
+perovskite SrIrO3 by reducing its thickness or by imposing compressive strain.
+The metal-insulator transition driven by thickness reduction is due to
+disorder, but the metal-insulator transition driven by compressive strain is
+accompanied by peculiar non-Fermi liquid behaviors, possibly due to the
+delicate interplay between correlation, disorder, and spin-orbit coupling. We
+examine various theoretical frameworks to understand the non-Fermi liquid
+physics and metal-insulator transition that occurs in SrIrO3 and offer the
+Mott-Anderson-Griffiths scenario as a possible solution.",1508.04929v2
+2021-10-25,Persistent large anisotropic magnetoresistance and insulator to metal transition in spin-orbit coupled antiferromagnets Sr2(Ir1-xGax)O4,"Antiferromagnetic (AFM) spintronics, where magneto-transport is governed by
+an antiferromagnet instead of a ferromagnet, opens fascinating new perspectives
+for both fundamental research and device technology, owing to their intrinsic
+appealing properties like rigidness to magnetic field, absence of stray field,
+and ultrafast spin dynamics. One of the urgent challenges, hindering the
+realization of the full potential of AFM spintronics, has been the performance
+gap between AFM metals and insulators. Here, we demonstrate the insulator-metal
+transition and persistently large anisotropic magnetoresistance (AMR) in single
+crystals Sr2(Ir1-xGax)O4 (0<x<0.09) which host the same basal-plane AFM lattice
+with strong spin-orbit coupling. The non-doped Sr2IrO4 shows the insulating
+transport with the AMR as big as ~16.8% at 50 K. The Ga substitution of Ir
+allows a gradual reduction of electrical resistivity, and a clear
+insulator-to-metal transition is identified in doped samples with x above 0.05,
+while the AMR can still have ~1%, sizable in comparison with those in AFM
+metals reported so far. Our experiments reveal that all the samples have the
+similar fourfold AMR symmetry, which can be well understood in the scenario of
+magnetocrystalline anisotropy. It is suggested that the spin-orbit coupled
+antiferromagnets Sr2(Ir1-xGax)O4 are promising candidate materials for AFM
+spintronics, providing a rare opportunity to integrate the superior spintronic
+functionalities of AFM metals and insulators.",2110.12852v1
+2022-04-13,Multiple higher-order topological phases with even and odd pairs of zero-energy corner modes in a $C_3$ symmetry broken model,"The higher-order corner modes for quantum anomalous Hall insulators in $C_3$
+symmetry broken honeycomb lattice have been engineered recently. Here we
+consider an extended Haldane model in presence of inversion symmetry breaking
+sub-lattice mass, time-reversal symmetry breaking Zeeman field and spin-orbit
+coupling interaction where we find that only the quantum spin Hall insulator
+can host the second-order dipolar phase while the remaining two first-order
+topological phases do not morph into the latter. Remarkably, four-fold
+degeneracy of zero-energy dipolar states can be reduced to two-fold under the
+application (withdrawn) of sub-lattice mass (Zeeman field) term when the
+spin-orbit coupling is already present. On the other hand, the sub-lattice mass
+and Zeeman field terms compete with each other to pin down the two mid-gap
+states at zero-energy in the absence or presence of spin-orbit coupling.
+Interestingly, the bulk-polarization can topologically characterize the dipolar
+phase irrespective of the energy of the mid-gap states as long as inversion
+symmetry is preserved. The effective gap criterion can qualitatively mimic the
+extent of SOT phase originated by the interplay between finite Zeeman exchange
+field, sub-lattice mass, and SOC interaction.",2204.06641v2
+2023-03-01,Ising Superconductivity and Nematicity in Bernal Bilayer Graphene with Strong Spin Orbit Coupling,"Superconductivity is a ubiquitous feature of graphite allotropes, having been
+observed in Bernal bilayers, rhombohedral trilayers, and a wide variety of
+angle-misaligned multilayers. Despite significant differences in the electronic
+structure across these systems, supporting the graphite layer on a WSe$_2$
+substrate has been consistently observed to expand the range of
+superconductivity in carrier density and temperature. Here, we report the
+observation of two distinct superconducting states (denoted SC$_1$ and SC$_2$)
+in Bernal bilayer graphene with strong proximity-induced Ising spin-orbit
+coupling. Quantum oscillations show that while the normal state of SC$_1$ is
+consistent with the single-particle band structure, SC$_2$ emerges from a
+nematic normal state with broken rotational symmetry. Both superconductors are
+robust to in-plane magnetic fields, violating the paramagnetic limit as
+expected for spin-valley locked Ising superconductors. Our results show that
+the enhancement of superconductivity in WSe$_2$ supported graphite allotropes
+can be directly linked to Ising spin orbit coupling, which favors
+valley-balanced ground states with time-reversal symmetric Fermi surfaces
+friendly to superconducting pairing.",2303.00742v1
+2023-08-06,The Einstein-de Haas Effect in an $\textrm{Fe}_{15}$ Cluster,"Classical models of spin-lattice coupling are at present unable to accurately
+reproduce results for numerous properties of ferromagnetic materials, such as
+heat transport coefficients or the sudden collapse of the magnetic moment in
+hcp-Fe under pressure. This inability has been attributed to the absence of a
+proper treatment of effects that are inherently quantum mechanical in nature,
+notably spin-orbit coupling. This paper introduces a time-dependent,
+non-collinear tight binding model, complete with spin-orbit coupling and vector
+Stoner exchange terms, that is capable of simulating the Einstein-de Haas
+effect in a ferromagnetic $\textrm{Fe}_{15}$ cluster. The tight binding model
+is used to investigate the adiabaticity timescales that determine the response
+of the orbital and spin angular momenta to a rotating, externally applied $B$
+field, and we show that the qualitative behaviours of our simulations can be
+extrapolated to realistic timescales by use of the adiabatic theorem. An
+analysis of the trends in the torque contributions with respect to the field
+strength demonstrates that SOC is necessary to observe a transfer of angular
+momentum from the electrons to the nuclei at experimentally realistic $B$
+fields. The simulations presented in this paper demonstrate the Einstein-de
+Haas effect from first principles using a Fe cluster.",2308.03130v2
+2020-01-29,Single Atom Qubits: Acceptors,"Acceptor dopant atoms in silicon have recently been identified as compelling
+candidates for spin-based quantum technologies. Interest in acceptor qubits
+ultimately derives from the properties of acceptor bound holes, where
+spin-orbit coupling quantizes total angular momentum $J=3/2$ rather than spin,
+endowing them with quadrupolar couplings to electric and elastic fields. This
+property of single-atom acceptor qubits makes them amenable to electric control
+and coupling over long distances using phonon, capacitive, or microwave photon
+mediated interactions. Accepted as a contribution within a roadmap for quantum
+technologies, this section reviews progress on single-acceptor devices,
+observation of ultra-long coherence times of acceptors in isotope purified
+silicon, and comments on future challenges in single qubit measurement, long
+distance coupling, and scalable acceptor-spin-based technologies.",2001.11119v1
+2018-03-05,Formation of a spin texture in a quantum gas coupled to a cavity,"We observe cavity mediated spin-dependent interactions in an off-resonantly
+driven multi-level atomic Bose-Einstein condensate that is strongly coupled to
+an optical cavity. Applying a driving field with adjustable polarization, we
+identify the roles of the scalar and the vectorial components of the atomic
+polarizability tensor for single and multi-component condensates. Beyond a
+critical strength of the vectorial coupling, we observe a spin texture in a
+condensate of two internal states, providing perspectives for global dynamic
+gauge fields and self-consistently spin-orbit coupled gases.",1803.01803v4
+2010-04-14,Tensor coupling effects on spin symmetry in anti-Lambda spectrum of hypernuclei,"The effects of $\bar\Lambda\bar\Lambda\omega$-tensor coupling on the spin
+symmetry of $\bar{\Lambda}$ spectra in $\bar{\Lambda}$-nucleus systems have
+been studied with the relativistic mean-field theory. Taking
+$^{12}$C+$\bar{\Lambda}$ as an example, it is found that the tensor coupling
+enlarges the spin-orbit splittings of $\bar\Lambda$ by an order of magnitude
+although its effects on the wave functions of $\bar{\Lambda}$ are negligible.
+Similar conclusions has been observed in $\bar{\Lambda}$-nucleus of different
+mass regions, including $^{16}$O+$\bar{\Lambda}$, $^{40}$Ca+$\bar{\Lambda}$ and
+$^{208}$Pb+$\bar{\Lambda}$. It indicates that the spin symmetry in
+anti-lambda-nucleus systems is still good irrespective of the tensor coupling.",1004.2313v1
+2013-06-12,Magnon self energy in the correlated ferromagnetic Kondo lattice model: spin-charge coupling effects on magnon excitations in manganites,"Magnon self energy due to spin-charge coupling is calculated for the
+correlated ferromagnetic Kondo lattice model using a diagrammatic expansion
+scheme. Systematically incorporating correlation effects in the form of
+self-energy and vertex corrections, the expansion scheme explicitly preserves
+the continuous spin rotation symmetry and hence the Goldstone mode. Due to a
+near cancellation of the correlation-induced quantum correction terms at
+intermediate coupling and optimal band filling relevant for ferromagnetic
+manganites, the renormalized magnon energies for the correlated FKLM are nearly
+independent of correlation term. Even at higher band fillings, despite
+exhibiting overall non-Heisenberg behavior, magnon dispersion in the \Gamma-X
+direction retains nearly Heisenberg form. Therefore, the experimentally
+observed doping dependent zone-boundary magnon softening must be ascribed to
+spin-orbital coupling effects.",1306.2769v1
+2015-12-09,Strong Cavity-Pseudospin Coupling in Monolayer Transition Metal Dichalcogenides: Spontaneous Spin-Oscillations and Magnetometry,"Strong coupling between the electronic states of monolayer transition metal
+dichalcogenides (TMDC) such as MoS$_2$, MoSe$_2$, WS$_2$, or WSe$_2$, and a
+two-dimensional (2D) photonic cavity gives rise to several exotic effects. The
+Dirac type Hamiltonian for a 2D gapped semiconductor with large spin-orbit
+coupling facilitates pure Jaynes-Cummings type coupling in the presence of a
+single mode electric field. The presence of an additional circularly polarized
+beam of light gives rise to valley and spin dependent cavity-QED properties.
+The cavity causes the TMDC monolayer to act as an on-chip coherent light source
+and a spontaneous spin-oscillator. In addition, a TMDC monolayer in a cavity is
+a sensitive magnetic field sensor for an in-plane magnetic field.",1512.02712v1
+2019-04-28,Chiral light-matter interactions using spin-valley states in transition metal dichalcogenides,"Chiral light-matter interactions can enable polarization to control the
+direction of light emission in a photonic device. Most realizations of chiral
+light-matter interactions require external magnetic fields to break
+time-reversal symmetry of the emitter. One way to eliminate this requirement is
+to utilize strong spin-orbit coupling present in transition metal
+dichalcogenides that exhibit a valley dependent polarized emission. Such
+interactions were previously reported using plasmonic waveguides, but these
+structures exhibit short propagation lengths due to loss. Chiral dielectric
+structures exhibit much lower loss levels and could therefore solve this
+problem. We demonstrate chiral light-matter interactions using spin-valley
+states of transition metal dichalcogenide monolayers coupled to a dielectric
+waveguide. We use a photonic crystal glide plane waveguide that exhibits chiral
+modes with high field intensity, coupled to monolayer WSe2. We show that the
+circularly polarized emission of the monolayer preferentially couples to one
+direction of the waveguide, with a directionality as high as 0.35, limited by
+the polarization purity of the bare monolayer emission. This system enables
+on-chip directional control of light and could provide new ways to control spin
+and valley degrees of freedom in a scalable photonic platform.",1904.12349v1
+2020-03-26,Experimental realization of spin-tensor momentum coupling in ultracold Fermi gases,"We experimentally realize the spin-tensor momentum coupling (STMC) using the
+three ground Zeeman states coupled by three Raman laser beams in ultracold
+atomic system of $^{40}$K Fermi atoms. This new type of STMC consists of two
+bright-state bands as a regular spin-orbit coupled spin-1/2 system and one
+dark-state middle band. Using radio-frequency spin-injection spectroscopy, we
+investigate the energy band of STMC. It is demonstrated that the middle state
+is a dark state in the STMC system. The realized energy band of STMC may open
+the door for further exploring exotic quantum matters.",2003.11829v1
+2022-03-08,Coupling between improper ferroelectricity and ferrimagnetism in hexagonal ferrites,"Antisymmetric Dzyaloshinskii-Moriya (DM) interactions generating from the
+spin-orbit coupling induce various fascinating properties, like magnetoelectric
+(ME) effect, weak ferromagnetism and non-trivial topological spin textures like
+skyrmions, in real materials. Compared to their symmetric isotropic exchange
+counterpart, these interactions are generally of a weaker order of strength,
+creating modest twisting in the spin structure which results in weak
+ferromagntism or weak linear ME effect. Our proposed two-sublattice model, in
+contrast, predicts a hitherto unobserved, charge ordered non-collinear
+ferrimagnetic behavior with a considerably high magnetization $\textbf{M}$
+coexisting with a ferroelectric (FE) order with an electric polarization
+$\textbf{P}$ and a strong cross coupling between them which is primarily driven
+by the inter-sublattice DM interactions. The key to realize these effects is
+the coupling between these microscopic interactions and the FE primary order
+parameter. We predict microscopic mechanisms to achieve electric field
+$\textbf{E}$ induced spin-reorientation transitions and 180$^{\circ}$ switching
+of the direction of $\textbf{M}$. This model was realized in the hexagonal
+phase of LuFeO$_3$ doped with electrons. This system shows $P \sim$ 15
+$\mu$C/cm$^2$, $M \sim$ 1.3 $\mu_B$/Fe and magnetic transition near room
+temperature ($\sim$ 290 K). Our theoretical results are expected to stimulate
+further quest for energy-efficient routes to control magnetism for spintronics
+applications.",2203.03841v1
+2018-05-29,Emergence of Weyl metals driven by doped magnetic impurities in spin-orbit coupled semiconductors,"Constructing an effective field theory in terms of doped magnetic impurities
+(described by an O(3) vector model with a random mass term), itinerant
+electrons of spin-orbit coupled semiconductors (given by a Dirac theory with a
+relatively large mass term), and effective interactions between doped magnetic
+ions and itinerant electrons (assumed by an effective Zeeman coupling term), we
+perform the perturbative renormalization group analysis in the one-loop level
+based on the dimensional regularization technique. As a result, we find that
+the mass renormalization in dynamics of itinerant electrons acquires negative
+feedback effects due to quantum fluctuations involved with the Zeeman coupling
+term, in contrast with that of the conventional problem of quantum
+electrodynamics, where such interaction effects enhance the fermion mass more
+rapidly. Recalling that the applied magnetic field decreases the band gap in
+the presence of spin-orbit coupling, this renormalization group analysis shows
+that the external magnetic field overcomes the renormalized band gap, allowed
+by doped magnetic impurities even without ferromagnetic ordering. In other
+words, the Weyl metal physics can be controlled by doping magnetic impurities
+into spin-orbit coupled semiconductors, even if the external magnetic field
+alone cannot realize the Weyl metal phase due to relatively large band gaps of
+semiconductors. Furthermore, we emphasize that quasiparticles do not exist in
+this emergent disordered Weyl metal phase due to correlations with strong
+magnetic fluctuations. This non-Fermi liquid type Weyl metal state may be
+regarded to be a novel metallic phase in the respect that a topologically
+nontrivial band structure appears in the vicinity of quantum criticality.",1805.11209v3
+2022-03-09,Quenched Λ spin-orbit splitting by relativistic Fock diagram in single-Λ hypernuclei,"We extend the relativistic Hartree-Fock (RHF) theory to study the structure
+of single-$\Lambda$ hypernuclei. The density dependence is taken in both
+meson-nucleon and meson-hyperon coupling strengths, and the induced
+$\Lambda$-nucleon ($\Lambda N$) effective interactions are determined by
+fitting $\Lambda$ separation energies to the experimental data for several
+single-$\Lambda$ hypernuclei. The equilibrium of nuclear dynamics described by
+the RHF model in normal atomic nuclei, namely, the balance between nuclear
+attractive and repulsive interactions, is then found to be drastically changed
+in single-$\Lambda$ hypernuclei, revealing a different role of Fock terms via
+$\Lambda$ hyperon from the nucleon exchange. Since only one hyperon exists in a
+single-$\Lambda$ hypernucleus, the overwhelmed $\Lambda N$ and $\Lambda\Lambda$
+attractions via the Hartree than the $\Lambda\Lambda$ repulsion from the Fock
+terms require an alternation of meson-hyperon coupling strengths in RHF to
+rebalance the effective nuclear force with the strangeness degree of freedom,
+leading to an improved description of $\Lambda$ Dirac mass and correspondingly
+a systematically reduced $\sigma$-$\Lambda$ coupling strength
+$g_{\sigma\Lambda}$ in current models as compared to those relativistic
+mean-field (RMF) approaches without Fock terms. As a result, the effective
+$\Lambda$ spin-orbit coupling potential in the ground state of hypernuclei is
+suppressed, and these RHF models predict correspondingly a quenching effect in
+$\Lambda$ spin-orbit splitting in comparison with the RMF cases. Furthermore,
+the $\Lambda$ spin-orbit splitting could decrease efficiently by evolving the
+hyperon-relevant couplings $g_{\sigma\Lambda}$ and $g_{\omega\Lambda}$
+simultaneously, where to reconcile with the empirical value the RHF models
+address a larger parameter space of meson-hyperon couplings.",2203.04581v2
+2023-04-05,Scaling laws of the magnetic dynamics driven high harmonic generation in spin-orbit coupled systems,"The emergence of high order harmonics in carrier pumping from magnetic
+dynamics in the presence of spin-orbit coupling has been only recently
+predicted [{Phys. Rev. B \textbf{105}, L180415 (2022)}]. In this effect, the
+number of the excited high harmonics is found to scale up with the spin-orbit
+coupling parameter, the s-d exchange constant of the magnetic system and the
+frequency of the driving dynamics. Motivated by the reproduction of the
+above-mentioned effect, Nikoli\'{c} and Manjarres [arXiv:2212.06895,
+arXiv:2112.14685] confirmed that there is indeed a generation of harmonics as a
+result of the interplay between magnetic dynamics and spin-orbit interaction if
+the exchange coupling $J$ is taken very small ($J=0.1\gamma$). However, they
+claim that the ultrahigh harmonics obtained in the strong $J$ limit can only be
+a result of numerical bugs. It turns out that in these works, conclusions built
+from numerical simulations performed in the perturbative limit
+($J/\hbar\omega\approx 10$) have been applied to criticize results obtained in
+the extremely high non-linear regime ($J/\hbar\omega>10^3$). Regarding this
+fact, we find it necessary to shed light on many aspects related to the physics
+behind the predicted unconventional carrier pumping, in order to enlighten the
+readers of the proposed effect and at the same time the authors of the
+criticizing works. Here, we present numerical simulations of the scaling laws
+underlying the effect. We study the low s-d exchange coupling limit,
+corresponding to the regime studied in the above mentioned criticizing works.
+And further explore, the high s-d coupling regime where the extremely nonlinear
+emission is expected. Furthermore, we provide more insights on the effect and
+demonstrate its robustness and reproducibility in both 1D and 2D magnetic
+structures.",2304.02619v2
+2014-09-22,Unconventional proximity-induced superconductivity in bilayer systems,"We study the proximity-induced superconducting state in a general bilayer --
+conventional $s$-wave superconductor hybrid structure. For the bilayer we
+include a general parabolic dispersion, Rashba spin-orbit coupling, and finite
+layer tunneling as well as the possibility to apply a bias potential and a
+magnetic Zeeman field, in order to address experimentally relevant bilayer
+systems, ranging from topological insulator thin films to generic double
+quantum well systems. By extracting the proximity-induced anomalous Green's
+function in the bilayer we show on a very rich structure for the
+superconducting pairing, including different spin states and odd-frequency
+pairing. Equal-spin spin-triplet $p_x\pm ip_y$-wave pairing is induced in both
+layers in the presence of a finite spin-orbit coupling and opposite-spin
+spin-triplet $s$-wave pairing with odd-frequency dependence appears for an
+applied magnetic Zeeman field. Finite interlayer pairing is also generally
+present in the bilayer. The interlayer pairing can be either even or odd in the
+layer index, with a complete reciprocity between parity in frequency and in
+layer index. We also find that a bilayer offers the possibility of sign
+reversal of the superconducting order parameters, both between the two layers
+and between multiple Fermi surfaces.",1409.6178v2
+2014-10-23,Spectroscopic confirmation of linear relation between Heisenberg- and interfacial Dzyaloshinskii-Moriya-exchange in polycrystalline metal films,"Proposals for novel spin-orbitronic logic1 and memory devices2 are often
+predicated on assumptions as to how materials with large spin-orbit coupling
+interact with ferromagnets when in contact. Such interactions give rise to a
+host of novel phenomena, such as spin-orbit torques3,4 , chiral
+spin-structures5,6 and chiral spin-torques. These chiral properties are related
+to the anti-symmetric exchange, also referred to as the interfacial
+Dzyaloshinskii-Moriya interaction (DMI)9,10. For numerous phenomena, the
+relative strengths of the symmetric Heisenberg exchange and the DMI is of great
+importance. Here, we use optical spin-wave spectroscopy (Brillouin light
+scattering) to directly determine the DMI vector for a series of Ni80Fe20/Pt
+samples, and then compare the nearest-neighbor DMI coupling energy with the
+independently measured Heisenberg exchange integral. We find that the
+Ni80Fe20-thickness-dependencies of both the microscopic symmetric- and
+antisymmetric-exchange are identical, consistent with the notion that the basic
+mechanisms of the DMI and Heisenberg exchange essentially share the same
+underlying physics, as was originally proposed by Moriya11. While of
+significant fundamental importance, this result also leads us to a deeper
+understanding of DMI and how it could be optimized for spin-orbitronic
+applications.",1410.6243v1
+2015-03-28,Mimicing the Kane-Mele type spin orbit interaction by spin-flexual phonon coupling in graphene devices,"On the efforts of enhancing the spin orbit interaction (SOI) of graphene for
+seeking the dissipationless quantum spin Hall devices, unique Kane-Mele type
+SOI and high mobility samples are desired. However, common external decoration
+often introduces extrinsic Rashba-type SOI and simultaneous impurity
+scattering. Here we show, by the EDTA-Dy molecule decorating, the Kane-Mele
+type SOI is mimicked with even improved carrier mobility. It is evidenced by
+the suppressed weak localization at equal carrier densities and simultaneous
+Elliot-Yafet spin relaxation. The extracted spin scattering time is
+monotonically dependent on the carrier elastic scattering time, where the
+Elliot-Yafet plot gives the interaction strength of 3.3 meV. Improved quantum
+Hall plateaus can be even seen after the external operation. This is attributed
+to the spin-flexural phonon coupling induced by the enhanced graphene ripples,
+as revealed by the in-plane magnetotransport measurement.",1503.08282v4
+2016-07-27,Three-Dimensional Majorana Fermions in Chiral Superconductors,"Through a systematic symmetry and topology analysis we establish that
+three-dimensional chiral superconductors with strong spin-orbit coupling and
+odd-parity pairing generically host low-energy nodal quasiparticles that are
+spin-non-degenerate and realize Majorana fermions in three dimensions. By
+examining all types of chiral Cooper pairs with total angular momentum $J$
+formed by Bloch electrons with angular momentum $j$ in crystals, we obtain a
+comprehensive classification of gapless Majorana quasiparticles in terms of
+energy-momentum relation and location on the Fermi surface. We show that the
+existence of bulk Majorana fermions in the vicinity of spin-selective point
+nodes is rooted in the non-unitary nature of chiral pairing in
+spin-orbit-coupled superconductors. We address experimental signatures of
+Majorana fermions, and find that the nuclear magnetic resonance (NMR) spin
+relaxation rate is significantly suppressed for nuclear spins polarized along
+the nodal direction as a consequence of the spin-selective Majorana nature of
+nodal quasiparticles. Furthermore, Majorana nodes in the bulk have nontrivial
+topology and imply the presence of Majorana bound states on the surface that
+form arcs in momentum space. We conclude by proposing the heavy fermion
+superconductor PrOs$_4$Sb$_{12}$ and related materials as promising candidates
+for non-unitary chiral superconductors hosting three-dimensional Majorana
+fermions.",1607.08243v2
+2016-08-03,Real space mean-field theory of a spin-1 Bose gas in synthetic dimensions,"The internal degrees of freedom provided by ultracold atoms give a route for
+realizing higher dimensional physics in systems with limited spatial
+dimensions. Non-spatial degrees of freedom in these systems are dubbed
+""synthetic dimensions"". This connection is useful from an experimental
+standpoint but complicated by the fact that interactions alter the condensate
+ground state. Here we use the Gross-Pitaevskii equation to study ground state
+properties of a spin-1 Bose gas under the combined influence of an optical
+lattice, spin-orbit coupling, and interactions at the mean field level. The
+associated phases depend on the sign of the spin-dependent interaction
+parameter and the strength of the optical lattice potential. We find ""charge""
+and spin density wave phases which are directly related to helical spin order
+in real space and affect the behavior of edge currents in the synthetic
+dimension. We determine the resulting phase diagram as a function of the
+spin-orbit coupling and spin-dependent interaction strength, considering both
+attractive (ferromagnetic) and repulsive (polar) spin-dependent interactions.
+Our results are applicable to current and future experiments, specifically with
+$^{87}$Rb, $^{7}$Li, $^{41}$K, and $^{23}$Na.",1608.01346v2
+2019-09-17,Single spin resonance driven by electric modulation of the g factor anisotropy,"We address the problem of electronic and nuclear spin resonance of an
+individual atom on a surface driven by a scanning tunnelling microscope.
+Several mechanisms have been proposed so far, some of them based on the
+modulation of exchange and crystal field associated to a piezoelectric
+displacement of the adatom driven by the RF tip electric field. Here we
+consider a new mechanism, where the piezoelectric displacement modulates the g
+factor anisotropy, leading both to electronic and nuclear spin flip
+transitions. We discuss thoroughly the cases of Ti-H (S = 1/2) and Fe (S = 2)
+on MgO, relevant for recent experiments. We model the system using two
+approaches. First, an analytical model that includes crystal field, spin orbit
+coupling and hyperfine interactions. Second, we carry out density functional
+based calculations. We find that the modulation of the anisotropy of the g
+tensor due to the piezoelectric displacement of the atom is an additional
+mechanism for STM based single spin resonance, that would be effective in S =
+1/2 adatoms with large spin orbit coupling. In the case of Ti-H on MgO, we
+predict a modulation spin resonance frequency driven by the DC electric field
+of the tip.",1909.07942v1
+2020-12-20,Chiral tunneling in single layer graphene with Rashba spin-orbit coupling: spin currents,"We study forward scattering of 2D massless Dirac electrons at Fermi energy
+{\varepsilon} > 0 in single layer graphene through a 1D rectangular barrier of
+height {u_0} in the presence of uniform Rashba spin-orbit coupling (of strength
+{\lambda}). The role of the Klein paradox in graphene spintronics is thereby
+exposed. It is shown that (1) For {\varepsilon} - 2{\lambda} < {u_0}<
+{\varepsilon} + 2{\lambda} there is partial Klein tunneling, wherein the
+transmission is bounded by 1 and, quite remarkably, for small {\lambda} >
+{\lambda_0} {\approx} 0.1 meV, the transmission nearly vanishes when the
+scattering energy equals the barrier height, {\varepsilon}={u_0}. (2) Spin
+density and spin-current density are shown to be remarkably different than
+these observables predicted in bulk single layer graphene. In particular, they
+are sensitive to {\lambda} and {u_0}. (3) Spin current densities are space
+dependent, implying the occurrence of non-zero spin torque density. Such a
+system may serve as a graphene based spintronic device without the use of an
+external magnetic field or magnetic materials.",2012.10971v4
+2018-06-07,Dynamics and Spin-Valley Locking Effects in Monolayer Transition Metal Dichalcogenides,"Transition metal dichalcogenides have been the primary materials of interest
+in the field of valleytronics for their potential in information storage, yet
+the limiting factor has been achieving long valley decoherence times. We
+explore the dynamics of four monolayer TMDCs (MoS$_2$, MoSe$_2$, WS$_2$,
+WSe$_2$) using ab initio calculations to describe electron-electron and
+electron-phonon interactions. By comparing calculations which both omit and
+include relativistic effects, we isolate the impact of spin-resolved spin-orbit
+coupling on transport properties. In our work, we find that spin-orbit coupling
+increases carrier lifetimes at the valence band edge by an order of magnitude
+due to spin-valley locking, with a proportional increase in the hole mobility
+at room temperature. At temperatures of 50~K, we find intervalley scattering
+times on the order of 100 ps, with a maximum value ~140 ps in WSe$_2$. Finally,
+we calculate excited-carrier generation profiles which indicate that direct
+transitions dominate across optical energies, even for WSe$_2$ which has an
+indirect band gap. Our results highlight the intriguing interplay between spin
+and valley degrees of freedom critical for valleytronic applications. Further,
+our work points towards interesting quantum properties on-demand in transition
+metal dichalcogenides that could be leveraged via driving spin, valley and
+phonon degrees of freedom.",1806.02673v1
+2019-08-18,Electron g-factor engineering for non-reciprocal spin photonics,"We study the interplay of electron and photon spin in non-reciprocal
+materials. Traditionally, the primary mechanism to design non-reciprocal
+photonic devices has been magnetic fields in conjunction with magnetic oxides,
+such as iron garnets. In this work, we present an alternative paradigm that
+allows tunability and reconfigurability of the non-reciprocity through
+spintronic approaches. The proposed design uses the high-spin-orbit coupling of
+a narrow-band gap semiconductor (InSb) with ferromagnetic dopants. A
+combination of the intrinsic and a gate-applied electric field gives rise to a
+strong external Rashba spin-orbit coupling (RSOC) in a magnetically doped InSb
+film. The RSOC which is gate alterable is shown to adjust the magnetic
+permeability tensor via the electron g-factor of the medium. We use electronic
+band structure calculations (k$\cdot$p theory) to show the gate-adjustable RSOC
+manifest itself in the non-reciprocal coefficient of photon fields via shifts
+in the Kerr and Faraday rotations. In addition, we show that photon spin
+properties of dipolar emitters placed in the vicinity of a non-reciprocal
+electromagnetic environment is distinct from reciprocal counterparts. The
+Purcell factor (F$_{p}$) of a spin-polarized emitter (right-handed circular
+dipole) is significantly enhanced due to a larger g-factor while a left-handed
+dipole remains essentially unaffected. Our work can lead to electron spin
+controlled reconfigurable non-reciprocal photonic devices.",1908.06393v2
+2016-12-01,Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$,"We use polarized inelastic neutron scattering to study the temperature and
+energy dependence of spin space anisotropies in the optimally hole-doped iron
+pnictide Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ ($T_{{\rm c}}=38$ K). In the
+superconducting state, while the high-energy part of the magnetic spectrum is
+nearly isotropic, the low-energy part displays a pronouced anisotropy,
+manifested by a $c$-axis polarized resonance. We also observe that the spin
+anisotropy in superconducting Ba$_{0.67}$K$_{0.33}$Fe$_{2}$As$_{2}$ extends to
+higher energies compared to electron-doped BaFe$_{2-x}TM_{x}$As$_{2}$ ($TM=$Co,
+Ni) and isovalent-doped BaFe$_{2}$As$_{1.4}$P$_{0.6}$, suggesting a connection
+between $T_{\rm c}$ and the energy scale of the spin anisotropy. In the normal
+state, the low-energy spin anisotropy for optimally hole- and electron-doped
+iron pnictides onset at temperatures similar to the temperatures at which the
+elastoresistance deviate from Curie-Weiss behavior, pointing to a possible
+connection between the two phenomena. Our results highlight the relevance of
+the spin-orbit coupling to the superconductivity of the iron pnictides.",1612.00379v2
+2018-10-13,Dynamics of spin-orbit-coupled cold atomic gases in a Floquet lattice with an impurity,"In this study, we have studied the quantum tunneling of a single
+spin-orbit-coupled atom held in a periodically modulated optical lattice with
+an impurity. At the pseudocollapse points of quasienergy bands, where the
+dynamical localization takes place globally, two types of local second-order
+tunneling processes appear beyond expectation between the two nearest-neighbor
+sites of the impurity with the spin unchanged and with impurity site population
+negligible all the time, when the impurity potential is far off-resonant with
+the driving field. Though tunneling behaviors of the two types seem to be the
+same, they are believed to involve two distinct mechanisms: one is related to
+spin-independent process, while the other is to spin-dependent tunneling
+process. The two types of second-order processes can be identified by means of
+resonant tunneling with or without spin-flipping by tuning the impurity
+potential to be in resonance with the driving field. In the Floquet picture,
+the second-order processes are manifested as subtle and fine avoided crossings
+of quasienergy spectrums near the pseudocollapse region. These results are
+confirmed analytically on the basis of effective three-site model and
+multiple-time-scale asymptotic perturbative method, and may be exploited for
+engineering the spin-dependent quantum transport in realistic experiments.",1810.05854v1
+2021-03-29,Spin-group symmetry in magnetic materials with negligible spin-orbit coupling,"Symmetry formulated by group theory plays an essential role with respect to
+the laws of nature, from fundamental particles to condensed matter systems.
+Here, by combining symmetry analysis and tight-binding model calculations, we
+elucidate that the crystallographic symmetries of a vast number of magnetic
+materials with light elements, in which the neglect of relativistic spin-orbit
+coupling (SOC) is an appropriate approximation, are considerably larger than
+the conventional magnetic groups. Thus, a symmetry description that involves
+partially-decoupled spin and spatial rotations, dubbed as spin group, is
+required. Spin group permits more symmetry operations and thus more energy
+degeneracies that are disallowed by the magnetic groups. One consequence of the
+spin group is the new anti-unitary symmetries that protect SOC-free Z_2
+topological phases with unprecedented surface node structures. Our work not
+only manifests the physical reality of materials with weak SOC, but also shed
+light on the understanding of all solids with and without SOC by a unified
+group theory.",2103.15723v4
+2021-07-28,Robust all-electrical topological valley filtering using monolayer 2D-Xenes,"We propose a realizable device design for an all-electrical robust valley
+filter that utilizes spin protected topological interface states hosted on
+monolayer 2D-Xene materials with large intrinsic spin-orbit coupling. In
+contrast with conventional quantum spin-Hall edge states localized around the
+$X$-points, the interface states appearing at the domain wall between
+topologically distinct phases are either from the $K$ or $K^{'}$ points, making
+them suitable prospects for serving as valley-polarized channels. We show that
+the presence of a large band-gap quantum spin Hall effect enables the spatial
+separation of the spin-valley locked helical interface states with the valley
+states being protected by spin conservation, leading to a robustness against
+short-range non-magnetic disorder. By adopting the scattering matrix formalism
+on a suitably designed device structure, valley-resolved transport in the
+presence of non-magnetic short-range disorder for different 2D-Xene materials
+is also analyzed in detail. Our numerical simulations confirm the role of
+spin-orbit coupling in achieving an improved valley filter performance with a
+perfect quantum of conductance attributed to the topologically protected
+interface states. Our analysis further elaborates clearly the right choice of
+material, device geometry and other factors that need to be considered while
+designing an optimized valleytronic filter device.",2107.13318v2
+2024-02-05,Second-order charge and spin transport in LaO/STO system in the presence of cubic Rashba spin orbit couplings,"Certain non-centrosymmetric materials with broken time-reversal symmetry may
+exhibit non-reciprocal transport behavior under an applied electric field in
+which the charge and spin currents contain components that are second order in
+the electric field. In this study, we investigate the second-order spin
+accumulation and charge and spin responses in the LaAlO$_3$/SrTiO$_3$ (LaO/STO)
+system with magnetic dopants under the influence of linear and cubic Rashba
+spin-orbit coupling (RSOC) terms. We explain the physical origin of the
+second-order response and perform a symmetry analysis of the first and
+second-order responses for different dopant magnetization directions relative
+to the applied electric field. We then numerically solve the Boltzmann
+transport equation by extending the approach of Schliemann and Loss [Phys. Rev.
+B 68, 165311] to higher orders in the electric field. We show that the sign of
+the second-order responses can be switched by varying the magnetization
+direction of the magnetic dopants or relative strengths of the two cubic RSOC
+terms and explain these trends by considering the Fermi surfaces of the
+respective systems. These findings provide insights into the interplay of
+multiple SOC effects in a LaO/STO system and how the resulting first- and
+second-order charge and spin responses can be engineered by exploiting the
+symmetries of the system.",2402.02652v1
+2009-07-27,Hamiltonian of a spinning test-particle in curved spacetime,"Using a Legendre transformation, we compute the unconstrained Hamiltonian of
+a spinning test-particle in a curved spacetime at linear order in the particle
+spin. The equations of motion of this unconstrained Hamiltonian coincide with
+the Mathisson-Papapetrou-Pirani equations. We then use the formalism of Dirac
+brackets to derive the constrained Hamiltonian and the corresponding
+phase-space algebra in the Newton-Wigner spin supplementary condition (SSC),
+suitably generalized to curved spacetime, and find that the phase-space algebra
+(q,p,S) is canonical at linear order in the particle spin. We provide explicit
+expressions for this Hamiltonian in a spherically symmetric spacetime, both in
+isotropic and spherical coordinates, and in the Kerr spacetime in
+Boyer-Lindquist coordinates. Furthermore, we find that our Hamiltonian, when
+expanded in Post-Newtonian (PN) orders, agrees with the Arnowitt-Deser-Misner
+(ADM) canonical Hamiltonian computed in PN theory in the test-particle limit.
+Notably, we recover the known spin-orbit couplings through 2.5PN order and the
+spin-spin couplings of type S_Kerr S (and S_Kerr^2) through 3PN order, S_Kerr
+being the spin of the Kerr spacetime. Our method allows one to compute the PN
+Hamiltonian at any order, in the test-particle limit and at linear order in the
+particle spin. As an application we compute it at 3.5PN order.",0907.4745v3
+2019-08-02,Tunable pure spin supercurrents and the demonstration of a superconducting spin-wave device,"Recent ferromagnetic resonance experiments and theory of Pt/Nb/Ni8Fe2
+proximity-coupled structures strongly suggest that spin-orbit coupling (SOC) in
+Pt in conjunction with a magnetic exchange field in Ni8Fe2 are the essential
+ingredients to generate a pure spin supercurrent channel in Nb. Here, by
+substituting Pt for a perpendicularly magnetized Pt/Co/Pt spin-sink, we are
+able to demonstrate the role of SOC, and show that pure spin supercurrent
+pumping efficiency across Nb is tunable by controlling the magnetization
+direction of Co. By inserting a Cu spacer with weak SOC between Nb and
+Pt/(Co/Pt) spin-sink, we also prove that Rashba type SOC is key for forming and
+transmitting pure spin supercurrents across Nb. Finally, by engineering these
+properties within a single multilayer structure, we demonstrate a prototype
+superconducting spin-wave (SW) device in which lateral SW propagation is
+gateable via the opening or closing of a vertical pure spin supercurrent
+channel in Nb.",1908.00873v3
+2021-02-09,Spin drift-diffusion for two-subband quantum wells,"Controlling the spin dynamics and spin lifetimes is one of the main
+challenges in spintronics. To this end, the study of the spin diffusion in
+two-dimensional electron gases (2DEGs) shows that when the Rashba and
+Dresselhaus spin-orbit couplings (SOC) are balanced, a persistent spin helix
+regime arises. There, a striped spin pattern shows a long lifetime, limited
+only by the cubic Dresselhaus SOC, and its dynamics can be controlled by
+in-plane drift fields. Here, we derive a spin diffusion equation for
+non-degenerate two-subbands 2DEGs. We show that the intersubband scattering
+rate, which is defined by the overlap of the subband densities, enters as a new
+nob to control the spin dynamics, and can be controlled by electric fields,
+being maximum for symmetric quantum wells. We find that for large intersubband
+couplings the dynamics follow an effective diffusion matrix given by
+approximately half of the subband-averaged matrices. This extra 1/2 factor
+arises from Matthiessen's rule summing over the intra- and intersubband
+scattering rates, and leads to a reduced diffusion constant and larger spin
+lifetimes. We illustrate our findings with numerical solutions of the diffusion
+equation with parameters extracted from realistic Schr\""odinger-Poisson
+calculations.",2102.04831v2
+2014-02-13,A new spin-anisotropic harmonic honeycomb iridate,"The physics of Mott insulators underlies diverse phenomena ranging from high
+temperature superconductivity to exotic magnetism. Although both the electron
+spin and the structure of the local orbitals play a key role in this physics,
+in most systems these are connected only indirectly --- via the Pauli exclusion
+principle and the Coulomb interaction. Iridium-based oxides (iridates) open a
+further dimension to this problem by introducing strong spin-orbit
+interactions, such that the Mott physics has a strong orbital character. In the
+layered honeycomb iridates this is thought to generate highly spin-anisotropic
+interactions, coupling the spin orientation to a given spatial direction of
+exchange and leading to strongly frustrated magnetism. The potential for new
+physics emerging from such interactions has driven much scientific excitement,
+most recently in the search for a new quantum spin liquid, first discussed by
+Kitaev \cite{kitaev_anyons_2006}. Here we report a new iridate structure that
+has the same local connectivity as the layered honeycomb, but in a
+three-dimensional framework. The temperature dependence of the magnetic
+susceptibility exhibits a striking reordering of the magnetic anisotropy,
+giving evidence for highly spin-anisotropic exchange interactions. Furthermore,
+the basic structural units of this material suggest the possibility of a new
+family of structures, the `harmonic honeycomb' iridates. This compound thus
+provides a unique and exciting glimpse into the physics of a new class of
+strongly spin-orbit coupled Mott insulators.",1402.3254v2
+2012-12-01,On the half-metallicity of Co2FeSi Heusler alloy: an experimental and ab initio study,"Co2FeSi, a Heusler alloy with the highest magnetic moment per unit cell and
+the highest Curie temperature, has largely been described theoretically as a
+half-metal. This conclusion, however, disagrees with Point Contact Andreev
+Reflection (PCAR) spectroscopy measurements, which give much lower values of
+spin polarization, P. Here, we present the spin polarization measurements of
+Co2FeSi by the PCAR technique, along with a thorough computational exploration,
+within the DFT and a GGA+U approach, of the Coulomb exchange U-parameters for
+Co and Fe atoms, taking into account spin-orbit coupling. We find that the
+orbital contribution (mo) to the total magnetic moment (mT) is significant,
+since it is at least 3 times greater than the experimental uncertainty of mT.
+Account of mo radically affects the acceptable values of U. Specifically, we
+find no values of U that would simultaneously satisfy the experimental values
+of the magnetic moment and result in the half-metallicity of Co2FeSi. On the
+other hand, the ranges of U that we report as acceptable are compatible with
+spin polarization measurements (ours and the ones found in the literature),
+which all are within approximately 40-60% range. Thus, based on reconciling
+experimental and computational results, we conclude that: a) spin-orbit
+coupling cannot be neglected in calculating Co2FeSi magnetic properties, and b)
+Co2FeSi Heusler alloy is not half-metallic. We believe that our approach can be
+applied to other Heusler alloys such as Co2FeAl.",1212.0168v1
+2014-10-12,"Spin-orbit coupling, strong correlation, and insulator-metal transitions: the J$_{\rm eff}$ =3\2 ferromagnetic Mott insulator Ba$_{2}$NaOsO$_{6}$","The double perovskite Ba$_{2}$NaOsO$_{6}$ (BNOO), an exotic example of a very
+high oxidation state (heptavalent) osmium $d^1$ compound and also uncommon by
+being a ferromagnetic Mott insulator without Jahn-Teller (JT) distortion, is
+modeled using the density functional theory (DFT) hybrid functional based exact
+exchange for correlated electrons (oeeHyb) method and including spin-orbit
+coupling (SOC). The experimentally observed narrow gap ferromagnetic insulating
+ground state is obtained, with easy axis along [110] in accord with experiment,
+providing support that this approach provides a realistic method for studying
+this system. The predicted spin density for [110] spin orientation is nearly
+cubic (unlike for other directions), providing an explanation for the absence
+of JT distortion. An orbital moment of -0.4$\mu_B$ strongly compensates the
++0.5$\mu_B$ spin moment on Os, leaving a strongly compensated moment more in
+line with experiment. Remarkably, the net moment lies primarily on the oxygen
+ions. An insulator-metal transition by rotating the magnetization direction
+with an external field under moderate pressure is predicted as one consequence
+of strong SOC, and metallization under moderate pressure is predicted.
+Comparison is made with the isostructural, isovalent insulator Ba$_2$LiOsO$_6$
+which however orders antiferromagnetically.",1410.3167v1
+2018-04-13,Tuning Rashba Spin-Orbit Coupling in Gated Multilayer InSe,"Manipulating the electron spin with the aid of spin-orbit coupling (SOC) is
+an indispensable element of spintronics. Electrostatically gating a material
+with strong SOC results in an effective magnetic field which can in turn be
+used to govern the electron spin. In this work, we report the existence and
+electrostatic tunability of Rashba SOC in multilayer InSe. We observed a
+gate-voltage-tuned crossover from weak localization (WL) to weak
+antilocalization (WAL) effect in quantum transport studies of InSe, which
+suggests an increasing SOC strength. Quantitative analyses of magneto-transport
+studies and energy band diagram calculations provide strong evidence for the
+predominance of Rashba SOC in electrostatically gated InSe. Furthermore, we
+attribute the tendency of the SOC strength to saturate at high gate voltages to
+the increased electronic density of states-induced saturation of the electric
+field experienced by the electrons in the InSe layer. This explanation of
+nonlinear gate voltage control of Rashba SOC can be generalized to other
+electrostatically gated semiconductor nanomaterials in which a similar tendency
+of spin-orbit length saturation was observed (e.g. nanowire field effect
+transistors), and is thus of broad implications in spintronics. Identifying and
+controlling the Rashba SOC in InSe may serve pivotally in devising III-VI
+semiconductor-based spintronic devices in the future.",1804.04992v2
+2018-06-07,Fractional topological insulator precursors in spin-orbit fermion ladders,"We study precursor states of fractional topological insulators (FTIs) in
+interacting fermionic ladders with spin-orbit coupling. Within a
+microscopically motivated bosonization approach, we investigate different
+competing phases depending on same-spin and interspin interactions at
+fractional effective filling $\nu=1/3$ per spin. In the spin-decoupled limit,
+we find that strong repulsive interactions of already moderate range may lead
+to a partially gapped state with two time-reversed copies of a quasi-one
+dimensional Laughlin phase. This FTI precursor competes with an interleg
+partially gapped phase displaying quasi long-range density wave order, however
+it may be stabilized if interactions have suitable anisotropy, or are
+sufficiently near SU($2$) symmetry, in leg space. When the FTI phase is
+present, it is moderately robust to small interspin interactions; these
+introduce competing partially gapped phases of orbital antiferromagnetic and
+bond density wave character. Performing a strong coupling analysis of the FTI
+precursor regime, we find that the main effect of interspin interactions is to
+induce correlated quasiparticle backscattering between the precursor FTI edge
+modes. Although this process competes with the topological phase, we show, by
+considering an array of ladders, that its influence may disappear upon
+approaching the two dimensional case. Considering time-reversal symmetry
+breaking perturbations, we also describe a protocol that adiabatically pumps
+$1/6$ charge per half-cycle, thus providing a quantized FTI signature arising
+already in the single ladder regime.",1806.02874v3
+2018-12-19,Interfacial Spin-Orbit Coupling: New Platform for Superconducting Spintronics,"Spin-orbit coupling (SOC) is a key interaction in spintronics, allowing an
+electrical control of spin or magnetization and, vice versa, a magnetic control
+of electrical current. However, recent advances have revealed much broader
+implications of SOC that is also central to the design of topological states,
+including topological insulators, skyrmions, and Majorana fermions, or to
+overcome the exclusion of two-dimensional ferro-magnetism expected from the
+Mermin-Wagner theorem. SOC and the resulting emergent interfacial spin-orbit
+fields are simply realized in junctions through structural inversion asymmetry,
+while the anisotropy in magnetoresistance (MR) allows for their experimental
+detection. Surprisingly, we demonstrate that an all-epitaxial
+ferromagnet/MgO/metal junction with only a negligible MR anisotropy undergoes a
+remarkable transformation below the superconducting transition temperature of
+the metal. The superconducting junction has a three orders of magnitude higher
+MR anisotropy and supports the formation of spin-triplet superconductivity,
+crucial for superconducting spintronics, and topologically-protected quantum
+computing. Our findings call for revisiting the role of SOC in other systems
+which, even when it seems negligible in the normal state, could have a profound
+influence on the superconducting response.",1812.08090v2
+2022-05-08,Spin interaction and magnetism in cobaltate Kitaev candidate materials: an $ab$ $initio$ and model Hamiltonian approach,"In the quest for materials hosting Kitaev spin liquids, much of the efforts
+have been focused on the fourth- and fifth-row transition metal compounds,
+which are spin-orbit coupling assisted Mott insulators. Here, we study the
+structural and magnetic properties of 3$d$ transition metal oxides,
+Na$_2$Co$_2$TeO$_6$ and Na$_3$Co$_2$SbO$_6$. The partial occupancy of sodium in
+former compound is addressed using a cluster expansion, and a honeycomb lattice
+of sodiums is found to be energetically favored. Starting from the \textit{ab
+initio} band structures, a many-body second order perturbation theory leads to
+a pseudospin-$\frac{1}{2}$ Hamiltonian with estimated magnetic interactions. We
+show that the experimentally observed zigzag magnetic state is stabilized only
+when the first neighbor Kitaev coupling dominates over the Heisenberg term,
+both of which are highly suppressed due to presence of $e_g$ orbitals. A third
+neighbor Heisenberg interaction is found dominant in both these compounds. We
+also present a phase diagram for Na$_2$Co$_2$TeO$_6$ by varying the
+electron-electron and spin-orbit interactions. The computed spin excitation
+spectra are found to capture essential features of recent experimental magnon
+spectrum, lending support to our results.",2205.03836v2
+2011-12-12,Spin and Orbital Angular Momentum Structures of Cu(111) and Au(111) Surface States,"We performed angle resolved photoemission (ARPES) studies on Cu(111) and
+Au(111) surface states with circularly polarized light. Existence of local
+orbital angular momentum (OAM) is confirmed as has been predicted to be broadly
+present in a system with an inversion symmetry breaking (ISB). The single band
+of Cu(111) surface states is found to have chiral OAM in spite of very small
+spin-orbit coupling (SOC) in Cu, which is consistent with theoretical
+prediction. As for Au(111), we observe split bands for which OAM for the inner
+and outer bands are parallel, unlike the Bi2Se3 case. We also performed first
+principles calculation and the results are found to be consistent with the
+experimental results. Moreover, majority of OAM is found to be from d-orbitals
+and a small contribution has p-orbital origin which is anti-aligned to the
+spins. We derive an effective Hamiltonian that incorporates the role of OAM and
+used it to extract the OAM and spin structures of surface states with various
+SOC strength. We discuss the evolution of angular momentum structures from pure
+OAM case to a strongly spin-orbit entangled state. We predict that the
+transition occurs through reversal of OAM direction at a k-point in the inner
+band if the system has a proper SOC strength.",1112.2469v1
+2013-12-30,Observation of monolayer valence band spin-orbit effect and induced quantum well states (QWS) in MoX2,"Transition metal dichalcogenides have attracted much attention recently due
+to their potential applications in spintronics and photonics as a result of the
+indirect to direct band gap transition and the emergence of the spin-valley
+coupling phenomenon upon moving from the bulk to monolayer limit. Here, we
+report high-resolution angle-resolved photoemission spectroscopy on MoSe2
+(molybdenum diselenide) single crystals and monolayer films of MoS2 grown on
+Highly Ordered Pyrolytic Graphite substrate. Our experimental results, for the
+first time, resolve the two distinct bands at the Brillouin zone corner of the
+bulk MoSe2, and provide evidence for the critically important spin-orbit split
+bands of the monolayer MoS2. Moreover, by depositing potassium on cleaved
+surfaces of these materials, the process through which quantum well states form
+on the surfaces of transition metal dichalcogenides is systematically imaged.
+We present a theoretical model to account for the observed spin-orbit splitting
+and the rich spectrum of the quantum well states observed in our experiments.
+Our findings taken together provide important insights into future applications
+of transition metal dichalcogenides in nanoelectronics, spintronics, and
+photonics devices as they critically depend on the spin-orbit physics of these
+materials.",1312.7631v2
+2015-10-23,Soft spin-amplitude fluctuations in a Mott-insulating ruthenate,"Magnetism in transition-metal compounds (TMCs) has traditionally been
+associated with spin degrees of freedom, because the orbital magnetic moments
+are typically largely quenched. On the other hand, magnetic order in 4f- and
+5d-electron systems arises from spin and orbital moments that are rigidly tied
+together by the large intra-atomic spin-orbit coupling (SOC). Using inelastic
+neutron scattering on the archetypal 4d-electron Mott insulator Ca$_2$RuO$_4$,
+we report a novel form of excitonic magnetism in the intermediate-strength
+regime of the SOC. The magnetic order is characterized by ``soft'' magnetic
+moments with large amplitude fluctuations manifested by an intense, low-energy
+excitonic mode analogous to the Higgs mode in particle physics. This mode
+heralds a proximate quantum critical point separating the soft magnetic order
+driven by the superexchange interaction from a quantum-paramagnetic state
+driven by the SOC. We further show that this quantum critical point can be
+tuned by lattice distortions, and hence may be accessible in epitaxial
+thin-film structures. The unconventional spin-orbital-lattice dynamics in
+Ca$_2$RuO$_4$ identifies the SOC as a novel source of quantum criticality in
+TMCs.",1510.07011v1
+2016-06-26,Manipulation of the large Rashba spin splitting in polar two-dimensional transition metal dichalcogenides,"Transition metal dichalcogenide (TMD) monolayers MXY (M=Mo, W, X(not equal
+to)Y=S, Se, Te) are two-dimensional polar semiconductors. Setting WSeTe
+monolayer as an example and using density functional theory calculations, we
+investigate the manipulation of Rashba spin orbit coupling (SOC) in the MXY
+monolayer. It is found that the intrinsic out-of-plane electric field due to
+the mirror symmetry breaking induces the large Rashba spin splitting around the
+Gamma point, which, however, can be easily tuned by applying the in-plane
+biaxial strain. Through a relatively small strain (from -2% to 2%), a large
+tunability (from around -50% to 50%) of Rashba SOC can be obtained due to the
+modified orbital overlap, which can in turn modulate the intrinsic electric
+field. The orbital selective external potential method further confirms the
+significance of the orbital overlap between W-dz2 and Se-pz in Rashba SOC. In
+addition, we also explore the influence of the external electric field on
+Rashba SOC in the WSeTe monolayer, which is less effective than strain. The
+large Rashba spin splitting, together with the valley spin splitting in MXY
+monolayers may make a special contribution to semiconductor spintronics and
+valleytronics.",1606.07985v2
+2017-06-27,Two-dimensional Spin-Orbit Dirac Point in Monolayer HfGeTe,"Dirac points in two-dimensional (2D) materials have been a fascinating
+subject of research, with graphene as the most prominent example. However, the
+Dirac points in existing 2D materials, including graphene, are vulnerable
+against spin-orbit coupling (SOC). Here, based on first-principles calculations
+and theoretical analysis, we propose a new family of stable 2D materials, the
+HfGeTe-family monolayers, which represent the first example to host so-called
+spin-orbit Dirac points (SDPs) close to the Fermi level. These Dirac points are
+special in that they are formed only under significant SOC, hence they are
+intrinsically robust against SOC. We show that the existence of a pair of SDPs
+are dictated by the nonsymmorphic space group symmetry of the system, which are
+very robust under various types of lattice strains. The energy, the dispersion,
+and the valley occupation around the Dirac points can be effectively tuned by
+strain. We construct a low-energy effective model to characterize the Dirac
+fermions around the SDPs. Furthermore, we find that the material is
+simultaneously a 2D $\mathbb{Z}_2$ topological metal, which possesses
+nontrivial $\mathbb{Z}_2$ invariant in the bulk and spin-helical edge states on
+the boundary. From the calculated exfoliation energies and mechanical
+properties, we show that these materials can be readily obtained in experiment
+from the existing bulk materials. Our result reveals HfGeTe-family monolayers
+as a promising platform for exploring spin-orbit Dirac fermions and novel
+topological phases in two-dimensions.",1706.08692v2
+2018-08-20,Spectroscopy and level detuning of few-electron spin states in parallel InAs quantum dots,"We use tunneling spectroscopy to study the evolution of few-electron spin
+states in parallel InAs nanowire double quantum dots (QDs) as a function of
+level detuning and applied magnetic field. Compared to the much more studied
+serial configuration, parallel coupling of the QDs to source and drain greatly
+expands the probing range of excited state transport. Owing to a strong
+confinement, we can here isolate transport involving only the very first
+interacting single QD orbital pair. For the (2,0)-(1,1) charge transition, with
+relevance for spin-based qubits, we investigate the excited (1,1) triplet, and
+hybridization of the (2,0) and (1,1) singlets. An applied magnetic field splits
+the (1,1) triplet, and due to spin-orbit induced mixing with the (2,0) singlet,
+we clearly resolve transport through all triplet states near the avoided
+singlet-triplet crossings. Transport calculations, based on a simple model with
+one orbital on each QD, fully replicate the experimental data. Finally, we
+observe an expected mirrored symmetry between the 1-2 and 2-3 electron
+transitions resulting from the two-fold spin degeneracy of the orbitals.",1808.06431v1
+2016-03-11,Instability of three-band Tomonaga-Luttinger liquid: renormalization group analysis and possible application to K2Cr3As3,"Motivated by recently discovered quasi-one-dimensional superconductor
+K$_{2}$Cr$_{3}$As$_{3}$ with $D_{3h}$ lattice symmetry, we study
+one-dimensional three-orbital Hubbard model with generic electron repulsive
+interaction described by intra-orbital repulsion $U$, inter-orbital repulsion,
+and Hund's coupling $J$. As extracted from density functional theory
+calculation, two of the three atomic orbitals are degenerate ($E^{\prime}$
+states) and the third one is non-degenerate ($A^{\prime}_1$), and the system is
+presumed to be at an incommensurate filling. With the help of bosonization, we
+have usual three-band Tomonaga-Luttinger liquid for the normal state. Possible
+charge density wave (CDW), spin density wave (SDW) and superconducting (SC)
+instabilities are analyzed by renormalization group. The ground state depends
+on the ratio $J/U$ and is sensitive to the degeneracy of $E^{\prime}$ bands. At
+$0<J<U/3$, spin-singlet SC state is favored, while spin-triplet
+superconductivity will be favored in the region $U/3<J<U/2$. The SDW state has
+the lowest energy only in the unphysical parameter region $J>U/2$. When the
+two-fold degeneracy of $E^{\prime}$ bands is lifted, SDW instability has the
+tendency to dominate over the spin-singlet SC state at $0<J<U/3$, while the
+order parameter of the spin-triplet SC state will be modulated by a phase
+factor $2\Delta k_F x$ at $U/3<J<U/2$. Possible experimental consequences and
+applications to K$_{2}$Cr$_{3}$As$_{3}$ are discussed.",1603.03651v3
+2021-10-25,Gravitational spin-orbit dynamics at the fifth-and-a-half post-Newtonian order,"Accurate waveform models are crucial for gravitational-wave data analysis,
+and since spin has a significant effect on the binary dynamics, it is important
+to improve the spin description in these models. In this paper, we derive the
+spin-orbit (SO) coupling at the fifth-and-a-half post-Newtonian (5.5PN) order.
+The method we use splits the conservative dynamics into local and
+nonlocal-in-time parts, then relates the local-in-time part to gravitational
+self-force results by exploiting the simple mass-ratio dependence of the
+post-Minkowskian expansion of the scattering angle. We calculate the nonlocal
+contribution to the 5.5PN SO dynamics to eighth order in the small-eccentricity
+expansion for bound orbits, and to leading order in the large-eccentricity
+expansion for unbound orbits. For the local contribution, we obtain all the
+5.5PN SO coefficients from first-order self-force results for the redshift and
+spin-precession invariants, except for one unknown that could be fixed in the
+future by second-order self-force results. However, by incorporating our 5.5PN
+results in the effective-one-body formalism and comparing its binding energy to
+numerical relativity, we find that the remaining unknown has a small effect on
+the SO dynamics, demonstrating an improvement in accuracy at that order.",2110.12813v2
+2022-08-19,Spin-orbit interactions in noncentrosymmetric plasmonic crystals probed by site-selective cathodoluminescence spectroscopy,"The study of spin-orbit coupling (SOC) of light is crucial to explore the
+light-matter interactions in sub-wavelength nanostructures with broken
+symmetries. In noncentrosymmetric photonic crystals, the SOC results in the
+splitting of the otherwise degenerate energy bands. Herein, we explore the SOC
+in a noncentrosymmetric plasmonic crystal, both theoretically and
+experimentally. Cathodoluminescence (CL) spectroscopy combined with the
+numerically calculated photonic band structure reveals an energy band splitting
+that is ascribed to the broken symmetries in the noncentrosymmetric plasmonic
+crystal. By shifting the impact position of the electron beam throughout a unit
+cell of the plasmonic crystal, we show that the emergence of the energy band
+splitting strongly depends on the excitation position of the surface plasmon
+(SP) waves on the crystal. Moreover, we exploit angle-resolved CL and
+dark-field polarimetry to demonstrate polarization-dependent scattering of SP
+waves interacting with the plasmonic crystal. The scattering direction of a
+given polarization is determined by the transverse spin angular momentum
+inherently carried by the SP wave, which is in turn locked to the direction of
+SP propagation. Our study gives insight into the design of novel plasmonic
+devices with polarization-dependent directionality of the Bloch plasmons. We
+expect spin-orbit plasmonics will find much more scientific interests and
+potential applications with the continuous development of nanofabrication
+methodologies and uncovering new aspects of spin-orbit interactions.",2208.09238v1
+2022-10-25,"Au4Mn, a localized ferromagnet with strong spin-orbit coupling, long-range ferromagnetic exchange and high Curie temperature","Metallic Mn-based alloys with a nearest-neighbor Mn-Mn distance greater than
+0.4 nm exhibit large, well-localized magnetic moments. Here we investigate the
+magnetism of tetragonal Au4Mn with a Curie temperature of 385 K, where
+manganese has a spin moment of 4.1 muB and its orbital moment is quenched.
+Since 80% of the atoms are gold, the spin orbit interaction is strong and Au4Mn
+exhibits uniaxial magnetocrystalline anisotropy with surface maze domains at
+room temperature. The magnetic hardness parameter of 1.0 is sufficient to
+maintain the magnetization along the c-axis for a sample of any shape. Au also
+reduces the spin moment of Mn through 5d-3d orbital hybridization. An induced
+moment of 0.05 muB was found on Au under a pulsed field of 40 T. Density
+functional theory calculations indicate that the Mn-Mn exchange is mediated by
+spin-polarized gold 5d and 6p electrons. The distance-dependence shows that it
+is ferromagnetic or zero for the first ten shells of Mn neighbors out to 1.041
+nm (64 atoms), and very weak and oscillatory thereafter.",2210.14069v1
+2024-01-12,FeS2 monolayer: a high valence and high-$T_{\rm C}$ Ising ferromagnet,"Two-dimensional (2D) magnetic materials are of current great interest for
+their promising applications in spintronics. Strong magnetic coupling and
+anisotropy are both highly desirable for the achievement of a high temperature
+magnetic order. Here we propose the unusual high valent FeS$_2$ hexagonal
+monolayer as such a candidate for a strong Ising 2D ferromagnet (FM), by
+spin-orbital state analyses, first-principles calculations, and the
+renormalized spin-wave theory (RSWT). We find that very importantly, the high
+valent Fe$^{4+}$ ion is in the low-spin state ($t_{2g}^{4}$, $S$=1) with
+degenerate $t_{2g}$ orbitals rather than the high-spin state
+($t_{2g}^{3}e_g^{1}$, $S$=2). It is the low-spin state that allows to carry a
+large perpendicular orbital moment and then produces a huge single ion
+anisotropy (SIA) of 25 meV/Fe. Moreover, the negative charge transfer character
+associated with the unusual high valence, strong Fe $3d$-S $3p$ hybridization,
+wide bands, and a small band gap all help to establish a strong superexchange.
+Indeed, our first-principles calculations confirm the strong FM superexchange
+and the huge perpendicular SIA, both of which are further enhanced by a
+compressive strain. Then, our RSWT calculations predict that the FM $T_{\rm C}$
+is 261 K for the pristine FeS$_2$ monolayer and could be increased to 409 K
+under the compressive --5\% strain. The high $T_{\rm C}$ is also reproduced by
+our Monte Carlo (MC) simulations. Therefore, it is worth exploring the
+high-$T_{\rm C}$ Ising FMs in the high valent 2D magnetic materials with
+degenerate orbitals.",2401.06357v1
+2024-03-11,Spin-orbit correlations in the nucleon in the large-$N_{c}$ limit,"We study the twist-3 spin-orbit correlations of quarks described by the
+nucleon matrix elements of the parity-odd rank-2 tensor QCD operator (the
+parity-odd partner of the QCD energy-momentum tensor). Our treatment is based
+on the effective dynamics emerging from the spontaneous breaking of chiral
+symmetry and the mean-field picture of the nucleon in the large-$N_c$ limit.
+The twist-3 QCD operators are converted to effective operators, in which the
+QCD interactions are replaced by spin-flavor-dependent chiral interactions of
+the quarks with the pion field. We compute the nucleon matrix elements of the
+twist-3 effective operators and discuss the role of the chiral interactions in
+the spin-orbit correlations. We derive the first-quantized representation in
+the mean-field picture and develop a quantum-mechanical interpretation. The
+chiral interactions give rise to new spin-orbit couplings and qualitatively
+change the correlations compared to the quark model picture. We also derive the
+twist-3 matrix elements in the topological soliton picture where the quarks are
+integrated out (skyrmion). The methods used here can be extended to other QCD
+operators describing higher-twist nucleon structure and generalized parton
+distributions.",2403.07186v1
+2023-12-29,"Effect of Exchange Interaction and Spin-Orbit Coupling on Spin Splitting in CdSnX (X = S, Se and Te) nanoribbons","We have studied the topological properties of free standing Sn doped cadmium
+chalcogenide (CdSnX, X = S, Se and Te) nanoribbons of varying widths and three
+types of edges viz., distorted armchair, normal armchair and normal zigzag
+edges. The unsatisfied bonds of X and Sn atoms at the edges cause non-zero
+values of the magnetic moment. This introduces an exchange field leading to
+inverted band structure. The electronic band structures of distorted armchair
+edge nanoribbons also exhibit different types of spin splitting property for
+different X atoms due to the different local orbital angular momentum at
+specific X atomic site with the inclusion of spin orbit coupling (SOC). The gap
+opening at the band crossings near the Fermi level after inclusion of SOC are
+mainly due to SOC of Sn atom and are responsible for the electron and hole
+pockets making the system topologically exotic. All the distorted edge
+nanoribbons show metallic behaviour with non-zero magnetic moments. Amongst CdX
+(X = S, Se and Te) nanoribbons, systems containing S atoms exhibit Weyl-like
+semi-metallic behavior and not much change with width, that of Se atoms exhibit
+Zeeman-type spin splitting and significant change with varying width, whereas
+systems containing Te atoms show signature of Rashba spin splitting along with
+Zeeman-type spin splitting and moderate change with varying width. The armchair
+edge nanoribbons show wide gap semiconducting behaviour. Zeeman-type spin
+splitting is seen in the valence band region for systems containing S atoms and
+Rashba spin splitting is visible in the conduction band region for systems
+containing Se and Te atoms. For zigzag edge nanoribbons, no such signature of
+spin splitting is observed although all the nanoribbons acquire very high
+magnetic moments.",2312.17562v1
+2005-03-31,Orbital selective Mott transition in multi-band systems: slave-spin representation and dynamical mean-field theory,"We examine whether the Mott transition of a half-filled, two-orbital Hubbard
+model with unequal bandwidths occurs simultaneously for both bands or whether
+it is a two-stage process in which the orbital with narrower bandwith localizes
+first (giving rise to an intermediate `orbital-selective' Mott phase). This
+question is addressed using both dynamical mean-field theory, and a
+representation of fermion operators in terms of slave quantum spins, followed
+by a mean-field approximation (similar in spirit to a Gutzwiller
+approximation). In the latter approach, the Mott transition is found to be
+orbital-selective for all values of the Coulomb exchange (Hund) coupling J when
+the bandwidth ratio is small, and only beyond a critical value of J when the
+bandwidth ratio is larger. Dynamical mean-field theory partially confirms these
+findings, but the intermediate phase at J=0 is found to differ from a
+conventional Mott insulator, with spectral weight extending down to arbitrary
+low energy. Finally, the orbital-selective Mott phase is found, at
+zero-temperature, to be unstable with respect to an inter-orbital
+hybridization, and replaced by a state with a large effective mass (and a low
+quasiparticle coherence scale) for the narrower band.",0503764v2
+2013-11-04,The kinematics and orbital dynamics of the PSR B1259$-$63/LS 2883 system from 23 years of pulsar timing,"We present an analysis of $23~$yr of pulse arrival times for PSR B1259$-$63.
+The pulsar is in a binary orbit about its approximately $20~M_{\odot}$
+companion LS$~$2883. Our best-fitting timing solution has none of the
+pulse-number ambiguities that have plagued previous attempts to model the
+binary orbit. We measure significant first and second time derivatives of the
+projected semimajor axis and longitude of the periastron of the orbit. These
+variations are found to be consistent with the precession of the orbital plane
+due to classical spin-orbit coupling. The derived moment of inertia and spin of
+the companion are consistent with the companion rotating at near-breakup
+velocity. The system configuration is also consistent with the geometry derived
+from both the polarisation of the radio emission and the eclipse of the pulsar
+by the equatorial disc of the companion. We find strong evidence for orbital
+period decay that can be attributed to mass loss from the companion star. We
+also measure a significant proper motion that locates the birth of the system
+in the Centaurus OB1 association. By combining proper motion of the pulsar with
+radial velocity measurements of the companion, we measure the three-dimensional
+velocity of the system. This velocity is used to constrain the masses of the
+stars prior to the supernova explosion and the kick the pulsar received at or
+immediately after the explosion.",1311.0588v1
+2019-01-15,Formation of Hot Jupiters through Secular Chaos and Dynamical Tides,"The population of giant planets on short-period orbits can potentially be
+explained by some flavours of high-eccentricity migration. In this paper we
+investigate one such mechanism involving ""secular chaos"", in which secular
+interactions between at least three giant planets push the inner planet to a
+highly eccentric orbit, followed by tidal circularization and orbital decay. In
+addition to the equilibrium tidal friction, we incorporate dissipation due to
+dynamical tides that are excited inside the giant planet. Using the method of
+Gaussian rings to account for planet-planet interactions, we explore the
+conditions for extreme eccentricity excitation via secular chaos and the
+properties of hot Jupiters formed in this migration channel. Our calculations
+show that once the inner planet reaches a sufficiently large eccentricity,
+dynamical tides quickly dissipate the orbital energy, producing an eccentric
+warm Jupiter, which then decays in semi-major axis through equilibrium tides to
+become a hot Jupiter. Dynamical tides help the planet avoid tidal disruption,
+increasing the chance of forming a hot Jupiter, although not all planets
+survive the process. We find that the final orbital periods generally lie in
+the range of 2-3 days, somewhat shorter than those of the observed hot Jupiter
+population. We couple the planet migration to the stellar spin evolution to
+predict the final spin-orbit misalignments. The distribution of the
+misalignment angles we obtain shows a lack of retrograde orbits compared to
+observations. Our results suggest that high-eccentricity migration via secular
+chaos can only account for a fraction of the observed hot Jupiter population.",1901.05006v1
+2004-07-21,Multi-orbital analysis on the Superconductivity in Na_{x}CoO_{2} \cdot y H_{2}O,"We preform a multi-orbital analysis on the novel superconductivity in
+Na_{x}CoO_{2} \cdot yH_{2}O. We construct a three-orbital model which
+reproduces the band structure expected from the LDA calculation. The effective
+interaction leading to the pairing is estimated by means of the perturbation
+theory. It is shown that the spin triplet superconductivity is stabilized in
+the wide parameter region. This is basically owing to the ferromagnetic
+character of spin fluctuation. The p-wave and f-wave superconductivity are
+nearly degenerate. The former is realized when the Hund's rule coupling is
+large, and vice versa. In a part of the parameter space, the d-wave
+superconductivity is also stabilized. We point out that the orbital degeneracy
+plays an essential role for these results through the wave function of
+quasi-particles. The nearly degeneracy of p-wave and f-wave superconductivity
+is explained by analysing the orbital character of each Fermi surface. We
+discuss the validity of some reduced models. While the single band Hubbard
+model reproducing the Fermi surface is qualitatively inappropriate, we find an
+effective two-orbital model appropriate for studying the superconductivity. We
+investigate the vertex corrections higher than the third order on the basis of
+the two-orbital model. It is shown that the vertex correction induces the
+screening effect but does not affect on the qualitative results.",0407563v2
+2004-11-18,Intrinsic Spin Hall Effect in the Two Dimensional Hole Gas,"We show that two types of spin-orbit coupling in the 2 dimensional hole gas
+(2DHG), with and without inversion symmetry breaking, contribute to the
+intrinsic spin Hall effect\cite{murakami2003,sinova2003}. Furthermore, the
+vertex correction due to impurity scattering vanishes in both cases, in sharp
+contrast to the case of usual Rashba coupling in the electron band. Recently,
+the spin Hall effect in a hole doped $GaAs$ semiconductor has been observed
+experimentally by Wunderlich \emph{et al}\cite{wunderlich2004}. From the fact
+that the life time broadening is smaller than the spin splitting, and the fact
+impurity vertex corrections vanish in this system, we argue that the observed
+spin Hall effect should be in the intrinsic regime.",0411457v3
+2006-06-03,Sign changes and resonance of intrinsic spin Hall effect in two-dimensional hole gas,"The intrinsic spin Hall conductance shows rich sign changes by applying a
+perpendicular magnetic field in a two-dimensional hole gas. Especially, a
+notable sign changes can be achieved by adjusting the characteristic length of
+the Rashba coupling and hole density at moderate magnetic fields. This sign
+issue may be easily realized in experiments. The oscillations of the intrinsic
+spin Hall conductance as a function of 1/$B$ is nothing else but Shubnikov-de
+Haas oscillations, and the additional beatings can be quantitatively related to
+the value of the spin-orbit coupling parameter. The Zeeman splitting is too
+small to introduce effective degeneracy between different Landau levels in a
+two-dimensional hole gas, and the resonant intrinsic spin Hall conductance
+appears in high hole density and strong magnetic field due to the transition
+between mostly spin-$-{1/2}$ holes and spin-3/2 holes is confirmed. Two likely
+ways to establish intrinsic spin Hall effect in experiments and a possible
+application are suggested.",0606089v2
+2011-07-06,Absence of spontaneous magnetic order of lattice spins coupled to itinerant interacting electrons in one and two dimensions,"We extend the Mermin-Wagner theorem to a system of lattice spins which are
+spin-coupled to itinerant and interacting charge carriers. We use the
+Bogoliubov inequality to rigorously prove that neither (anti-) ferromagnetic
+nor helical long-range order is possible in one and two dimensions at any
+finite temperature. Our proof applies to a wide class of models including any
+form of electron-electron and single-electron interactions that are independent
+of spin. In the presence of Rashba or Dresselhaus spin-orbit interactions (SOI)
+magnetic order is allowed and intimately connected to equilibrium spin
+currents. However, in the special case when Rashba and Dresselhaus SOIs are
+tuned to be equal, magnetic order is excluded again. This opens up a new
+possibility to control magnetism in magnetic semiconductors electrically.",1107.1223v2
+2012-06-28,Frequency and power dependence of spin-current emission by spin pumping in a thin film YIG/Pt system,"This paper presents the frequency dependence of the spin current emission in
+a hybrid ferrimagnetic insulator/normal metal system. The system is based on a
+ferrimagnetic insulating thin film of Yttrium Iron Garnet (YIG, 200 nm) grown
+by liquid-phase-epitaxy (LPE) coupled with a normal metal with a strong
+spin-orbit coupling (Pt, 15 nm). The YIG layer presents an isotropic behaviour
+of the magnetization in the plane, a small linewidth, and a roughness lower
+than 0.4 nm. Here we discuss how the voltage signal from the spin current
+detector depends on the frequency [0.6 - 7 GHz], the microwave power, Pin, [1 -
+70 mW], and the in-plane static magnetic field. A strong enhancement of the
+spin current emission is observed at low frequencies, showing the appearance of
+non-linear phenomena.",1206.6671v2
+2013-10-09,Chargeless spin current for switching and coupling of domain walls in magnetic nanowires,"The demonstration of the generation and control of a pure spin current
+(without net charge flow) by electric fields and/or temperature gradient has
+been an essential leap in the quest for low-power consumption electronics. The
+key issue of whether and how such a current can be utilized to drive and
+control information stored in magnetic domain walls (DWs) is still outstanding
+and is addressed here. We demonstrate that pure spin current acts on DWs in a
+magnetic stripe with an effective spin-transfer torque resulting in a mutual
+DWs separation dynamics and picosecond magnetization reversal. In addition,
+long-range ($\sim$ mm) antiferromagnetic DWs coupling emerges. If one DW is
+pinned by geometric constriction, the spin current induces a dynamical spin
+orbital interaction that triggers an internal electric field determined by
+$\vec{E} \sim \hat{e}_{x} \cdot (\vec{n}_{1} \times \vec{n}_{2})$ where
+$\vec{n}_{1/2}$ are the effective DWs orientations and $\hat{e}_{x} $ is their
+spatial separation vector. This leads to charge accumulation or persistent
+electric current in the wire. As DWs are routinely realizable and tuneable, the
+predicted effects bear genuine potential for power-saving spintronics devices.",1310.2331v1
+2013-10-14,"Symmetry Protected Topological Charge in Symmetry Broken Phase: Spin-Chern, Spin-Valley-Chern and Mirror-Chern Numbers","The Chern number is a genuine topological number. On the other hand, a
+symmetry protected topological (SPT) charge is a topological number only when a
+symmetry exists. We propose a formula for the SPT charge as a derivative of the
+Chern number in terms of the Green function in such a way that it is valid and
+related to the associated Hall current even when the symmetry is broken. We
+estimate the amount of deviation from the quantized value as a function of the
+strength of the broken symmetry. We present two examples. First, we consider
+Dirac electrons with the spin-orbit coupling on honeycomb lattice, where the
+SPT charges are given by the spin-Chern, valley-Chern and spin-valley-Chern
+numbers. Though the spin-Chern charge is not quantized in the presence of the
+Rashba coupling, the deviation is estimated to be $10^{-7}$ in the case of
+silicene, a silicon cousin of graphene. Second, we analyze the effect of the
+mirror-symmetry breaking of the mirror-Chern number in a thin-film of
+topological crystalline insulator.",1310.3536v2
+2014-04-02,Ground-state cooling of a carbon nanomechanical resonator by spin-polarized current,"We study the nonequilibrium steady state of a mechanical resonator in the
+quantum regime realized by a suspended carbon nanotube quantum dot contacted by
+two ferromagnets. Because of the spin-orbit interaction and/or an external
+magnetic field gradient, the spin on the dot couples directly to the flexural
+eigenmodes. Accordingly, the nanomechanical motion induces inelastic spin flips
+of the tunneling electrons. A spin-polarized current at finite bias voltage
+causes either heating or active cooling of the mechanical modes. We show that
+maximal cooling is achieved at resonant transport when the energy splitting
+between two dot levels of opposite spin equals the vibrational frequency. Even
+for weak electron-resonator coupling and moderate polarizations we can achieve
+ground-state cooling with a temperature of the leads, for instance, of
+$T=10\omega$.",1404.0485v3
+2014-07-22,Photonic spin Hall effect for precision metrology,"The photonic spin Hall effect (SHE) is generally believed to be a result of
+an effective spin-orbit coupling, which describes the mutual influence of the
+spin (polarization) and the trajectory of the light beam. The photonic SHE
+holds great potential for precision metrology owing to the fact that the
+spin-dependent splitting in photonic SHE are sensitive to the physical
+parameter variations of different systems. Remarkably, using the weak
+measurements, this tiny spin-dependent shifts can be detected with the
+desirable accuracy so that the corresponding physical parameters can be
+determined. Here, we will review some of our works on using photonic SHE for
+precision metrology, such as measuring the thickness of nanometal film,
+identifying the graphene layers, detecting the strength of axion coupling in
+topological insulators, and determining the magneto-optical constant of
+magnetic film.",1407.5721v2
+2015-10-21,Spin-dependent two-body interactions from gravitational self-force computations,"We analytically compute, through the eight-and-a-half post-Newtonian order
+and the fourth-order in spin, the gravitational self-force correction to
+Detweiler's gauge invariant redshift function for a small mass in circular
+orbit around a Kerr black hole. Using the first law of mechanics for black hole
+binaries with spin [L.~Blanchet, A.~Buonanno and A.~Le Tiec, Phys.\ Rev.\ D
+{\bf 87}, 024030 (2013)] we transcribe our results into a knowledge of various
+spin-dependent couplings, as encoded within the spinning effective-one-body
+model of T.~Damour and A.~Nagar [Phys.\ Rev.\ D {\bf 90}, 044018 (2014)]. We
+also compare our analytical results to the (corrected) numerical self-force
+results of A.~G.~Shah, J.~L.~Friedman and T.~S.~Keidl [Phys.\ Rev.\ D {\bf 86},
+084059 (2012)], from which we show how to directly extract physically relevant
+spin-dependent couplings.",1510.06230v2
+2018-04-27,All-electric single electron spin-to-charge conversion,"We examine spin-dependent displacement of a single electron, resulting in
+separation and relocation of the electron wavefunction components, and thus
+charge parts, corresponding to opposite spins. This separation is induced by a
+pulse of an electric field which generates varying Rashba type spin-orbit
+coupling. This mechanism is next implemented in a nanodevice based on a gated
+quantum dot defined within a quantum nanowire. The electric field pulse is
+generated by ultrafast changes of voltages, of the order of several hundred mV,
+applied to nearby gates. The device is modeled realistically with appropriate
+material parameters and voltages applied to the gates, yielding an accurate
+confinement potential and Rashba coupling. At the end, we propose a
+spin-to-charge conversion device, which with an additional charge detector will
+allow for electron spin state measurement.",1804.10595v2
+2018-05-15,Heavy quark spin multiplet structure of $\bar{P}^{(*)}Σ_Q^{(*)}$ molecular states,"We study the structure of heavy quark spin (HQS) multiplets for heavy
+meson-baryon molecular states in a coupled system of
+$\bar{P}^{(*)}\Sigma_{Q}^{(*)}$, with constructing the one-pion exchange
+potential with S-wave orbital angular momentum. Using the light cloud spin
+basis, we find that there are four types of HQS multiplets classified by the
+structure of heavy quark spin and light cloud spin. The multiplets which have
+attractive potential are determined by the sign of the coupling constant for
+the heavy meson-pion interactions. Furthermore, the difference in the structure
+of light cloud spin gives the restrictions of the decay channel, which implies
+that the partial decay width has the information for the structure of HQS
+multiplets. This behavior is more likely to appear in hidden-bottom sector than
+in hidden-charm sector.",1805.05740v1
+2009-12-10,Coupled-channel calculation of bound and resonant spectra of Lambda-9Be and Lambda-13C hypernuclei,"A Multi-Channel Algebraic Scattering (MCAS) approach has been used to analyze
+the spectra of two hyper-nuclear systems, Lambda-9Be and Lambda-13C. The
+splitting of the two odd-parity excited levels (1/2^- and 3/2^-) at 11 MeV
+excitation in Lambda-13C is driven mainly by the weak Lambda-nucleus spin-orbit
+force, but the splittings of the 3/2^+ and 5/2^+ levels in both Lambda-9Be and
+Lambda-13C have a different origin. These cases appear to be dominated by
+coupling to the collective 2+ states of the core nuclei. Using simple
+phenomenological potentials as input to the MCAS method, the observed splitting
+and level ordering in Lambda-9Be is reproduced with the addition of a weak
+spin-spin interaction acting between the hyperon and the spin of the excited
+target. With no such spin-spin interaction, the level ordering in Lambda-9Be is
+inverted with respect to that currently observed. In both hyper-nuclei, our
+calculations suggest that there are additional low-lying resonant states in the
+Lambda-nucleus continua.",0912.1970v1
+2012-05-16,"More about ""short"" spinning quantum strings","We continue investigation of the spectrum of semiclassical quantum strings in
+AdS5 x S5 on the examples of folded (S,J) string (with spin S in AdS5 and
+orbital momentum J in S5) dual to an sl(2) sector state in gauge theory and its
+(J',J) counterpart with spin J' in S5 dual to an su(2) sector state. We study
+the limits of small spins and large J at weak and strong coupling, pointing out
+that terms linear in spins provide a generalization of ""protected"" coefficients
+in the energy that are given by finite polynomials in 't Hooft coupling
+\lambda\ (or square of string tension) for any value of \lambda. We propose an
+expression for the coefficient of the term linear in spin J' in the (J',J)
+string energy which should be the su(2) sector counterpart of the ""slope
+function"" in the sl(2) sector suggested by Basso in arXiv:1109.3154.",1205.3656v3
+2017-05-23,Spin mixing and protection of ferromagnetism in a spinor dipolar condensate,"We study spin mixing dynamics in a chromium dipolar Bose-Einstein Condensate,
+after tilting the atomic spins by an angle $\theta$ with respect to the
+magnetic field. Spin mixing is triggered by dipolar coupling, but, once
+dynamics has started, it is mostly driven by contact interactions. For the
+particular case $\theta=\pi/2$, an external spin-orbit coupling term induced by
+a magnetic gradient is required to enable the dynamics. Then the initial
+ferromagnetic character of the gas is locally preserved, an unexpected feature
+that we attribute to large spin-dependent contact interactions.",1705.08358v1
+2018-12-19,Electric dipole spin resonance at shallow donors in quantum wires,"Electric dipole spin resonance is studied theoretically at a shallow donor
+formed in a nanowire with spin-orbit coupling in a magnetic field. Such system
+may represent a donor-based qubit. The single discrete energy level of the
+donor is accompanied by the set of continuum states, which provide a
+non-trivial interplay for the picture of electric dipole spin resonance driven
+by an external monochromatic field. Strongly nonlinear dependencies of spin
+flip time as well as of the coordinate mean values on the electric field
+amplitude are observed, demonstrating the significance of coupling to the
+continuum for spin-based qubits manipulation in nanostructures.",1812.08048v2
+2017-11-20,The electromagnetic instabilities propagation in weak relativistic quantum plasmas,"The electromagnetic instabilities excited by the temperature anisotropy have
+been always one of the interesting issues in real high-density physical
+systems, where the relativistic and quantum effects due to spin can be
+important. This paper discusses the case where plasma is not strongly coupled
+but is still in regimes where a classic plasma description is not fully
+adequate. The length scale of the plasma can be larger than the de-Broglie
+length so that the quantum effects relevance to the spin can be significant. In
+addition, the only relativistic effects are due to the electrons spin, for
+example the spin-orbit coupling effect (the weak (semi) relativistic effects).
+Obtained results imply that these effects can not be important in the ICF
+subjects while these can lead to significant results in the astrophysical
+subjects because of the strong magnetic fields. It is found that the weakly
+relativistic effects can cover the magnetic dipole force and the spin
+precession effects so that the growth rate of the instability can increase
+compared to the non relativistic spin polarized cases. Indeed, it is expected
+that the probability of electron capture in the background magnetic fields and
+the particle energy dissipation will be reduced so that there will be a high
+portion of free energy in the system.",1711.07200v1
+2019-05-02,Spin-valley coupled thermoelectric energy converter with strained honeycomb lattices,"A caloritronic device setup is proposed that harnesses the intrinsic
+spin-valley locking of two-dimensional honeycomb lattices with graphene-like
+valleys, for instance, silicene and stanene. Combining first-principles and
+analytic calculations, we quantitatively show that when sheets of such
+materials are placed on a ferromagnetic substrate and held between two contacts
+at different temperatures, an interplay between the electron degrees-of-freedom
+of charge, spin, and valley arises. A manifestation of this interplay are
+finite charge, spin, and valley currents. Uniaxial strain that adjusts the
+buckling height in silicene-type of lattices, in conjunction with an applied
+electric field, is shown to further modulate the aforementioned currents. We
+link these calculations to a Seebeck-like thermopower generator and obtain
+expressions (and means to optimize them) for two spin-valley polarized
+performance metrics--the thermodynamic efficiency and thermoelectric figure of
+merit. A closing summary outlines possible enhancements to presented results
+through the inherent topological order and substrate-induced external Rashba
+spin-orbit coupling that exists in silicene-type materials.",1905.00984v1
+2021-07-20,Intrinsic Magnon Nernst Effects in Pyrochlore Iridate Thin Films,"We theoretically study the magnon spin thermal transport using a strong
+coupling approach in pyrochlore iridate trilayer thin films grown along the
+[111] direction. As a result of the Dzyaloshinskii-Moriya interaction (DMI),
+the spin configuration of the ground state is an all-in/all-out ordering on
+neighboring tetrahedra of the pyrochlore lattice. In such a state, the system
+has an inversion symmetry and a Nernst-type thermal spin current response is
+well defined. We calculate the temperature dependence of the magnon Nernst
+response with respect to the magnon band topology controlled by the spin-orbit
+coupling parameters and observe topologically protected chiral edge modes over
+a range of parameters. Our study complements prior work on the magnon thermal
+Hall effect in thin-film pyrochlore iridates and suggests that the [111] grown
+thin-film pyrochlore iridates are a promising candidate for thermal spin
+transport and spin caloritronic devices.",2107.09613v1
+2021-08-03,Optical Rashba effect in a monolithic light-emitting perovskite metasurface,"The Rashba effect, i.e., the splitting of electronic spin-polarized bands in
+the momentum space of a crystal with broken inversion symmetry, has enabled the
+realization of spin-orbitronic devices, in which spins are manipulated by
+spin-orbit coupling. In optics, where the helicity of light polarization
+represents the spin degree of freedom for spin-momentum coupling, the optical
+Rashba effect is manifested by the splitting of optical states with opposite
+chirality in the momentum space. Previous realizations of the optical Rashba
+effect relied on passive devices determining either the propagation direction
+of surface plasmons or circularly polarized light into nanostructures, or the
+directional emission of polarized luminescence from metamaterials hybridized
+with light-emitting media. Here we demonstrate an active device underpinned by
+the optical Rashba effect, in which a monolithic halide perovskite metasurface
+emits highly directional chiral photoluminescence. An all-dielectric
+metasurface design with broken in-plane inversion symmetry is directly embossed
+into the high refractive index, light-emitting perovskite film, yielding a
+degree of circular polarization of photoluminescence of 40% at room temperature
+- more than one order of magnitude greater than in state of art chiral
+perovskites.",2108.01465v1
+2021-08-09,Holographic charm and bottom pentaquarks I: Mass spectra with spin effects,"We revisit the three non-strange pentaquarks $[\frac 12\frac 12^-]_{S=0,1}$
+and $[\frac 12\frac 32^-]_{S=1}$
+  predicted using the holographic dual description, where chiral and heavy
+quark symmetry are manifest in the triple limit of a large number of colors,
+large quark mass and strong $^\prime$t Hooft gauge coupling. In the heavy quark
+limit, the pentaquarks with internal heavy quark spin $S$ are all degenerate.
+The holographic pentaquarks are dual to an instanton bound to heavy mesons in
+bulk, without
+  the shortcomings related to the nature of the interaction and the choice of
+the hard core inherent to the molecular constructions. We explicitly derive the
+spin-spin and spin-orbit couplings arising from next to leading order in the
+heavy quark mass, and lift totally the internal spin degeneray, in fair
+agreement with the newly reported charmed pentaquarks from LHCb. New charm and
+bottom pentaquark states are predicted.",2108.04334v1
+2021-11-02,Floquet engineering of Kitaev quantum magnets,"In recent years, there has been an intense search for materials realizing the
+Kitaev quantum spin liquid model. A number of edge-shared compounds with strong
+spin-orbit coupling, such as RuCl$_3$ and iridates, have been proposed to
+realize this model. Nevertheless, an effective spin Hamiltonian derived from
+the microscopic model relevant to these compounds generally contains terms that
+are antagonistic toward the quantum spin liquid. This is consistent with the
+fact the zero magnetic field ground state of these materials is generally
+magnetically ordered. It is a pressing issue to identify protocols to drive the
+system to the limit of the Kitaev quantum spin model. In this work, we propose
+Floquet engineering of these Kitaev quantum magnets by coupling materials to a
+circularly polarized laser. We demonstrate that all the magnetic interactions
+can be tuned in situ by the amplitude and frequency of the laser, hence
+providing a route to stabilize the Kitaev quantum spin liquid phase.",2111.01316v1
+2021-11-29,Interface-Induced Conservation of Momentum Leads to Chiral-Induced Spin Selectivity,"We study the non-equilibrium dynamics of electron transmission from a
+straight waveguide to a helix with spin-orbit coupling. Transmission is found
+to be spin-selective and can lead to large spin polarizations of the itinerant
+electrons. The degree of spin selectivity depends on the width of the interface
+region, and no polarization is found for single-point couplings. We show that
+this is due to momentum conservation conditions arising from extended
+interfaces. We therefore identify interface structure and conservation of
+momentum as crucial ingredients for chiral-induced spin selectivity, and
+confirm that this mechanism is robust against static disorder.",2111.14770v1
+2022-09-23,A variational model for the hyperfine resolved spectrum of VO in its ground electronic state,"A variational model for the infra-red spectrum of VO is presented which aims
+to accurately predict the hyperfine structure within the VO
+$\mathrm{X}\,^4\Sigma^-$ electronic ground state. To give the correct electron
+spin splitting of the $\mathrm{X}\,^4\Sigma^-$ state, electron spin dipolar
+interaction within the ground state and the spin-orbit coupling between
+$\mathrm{X}\,^4\Sigma^-$ and two excited states, $\mathrm{A}\,^4\Pi$ and
+$\mathrm{1}\,^2\Sigma^+$, are calculated ab initio alongside hyperfine
+interaction terms. Four hyperfine coupling terms are explicitly considered:
+Fermi-contact interaction, electron spin-nuclear spin dipolar interaction,
+nuclear spin-rotation interaction and nuclear electric quadrupole interaction.
+These terms are included as part of a full variational solution of the
+nuclear-motion Schr\""odinger equation performed using program DUO, which is
+used to generate both hyperfine-resolved energy levels and spectra. To improve
+the accuracy of the model, ab initio curves are subject to small shifts. The
+energy levels generated by this model show good agreement with the recently
+derived empirical term values. This and other comparisons validate both our
+model and the recently developed hyperfine modules in DUO.",2210.02896v2
+2023-08-18,Critical enhancement of the spin Hall effect by spin fluctuations,"The spin Hall (SH) effect, the conversion of the electric current to the spin
+current along the transverse direction, relies on the relativistic spin-orbit
+coupling (SOC). Here, we develop a microscopic theory on the mechanisms of the
+SH effect in magnetic metals, where itinerant electrons are coupled with
+localized magnetic moments via the Hund exchange interaction and the SOC. Both
+antiferromagnetic metals and ferromagnetic metals are considered. It is shown
+that the SH conductivity can be significantly enhanced by the spin fluctuation
+when approaching the magnetic transition temperature of both cases. For
+antiferromagnetic metals, the pure SH effect appears in the entire temperature
+range, while for ferromagnetic metals, the pure SH effect is expected to be
+replaced by the anomalous Hall effect below the transition temperature. We
+discuss possible experimental realizations and the effect of the quantum
+criticality when the antiferromagnetic transition temperature is tuned to zero
+temperature.",2308.09636v2
+2014-07-23,Magnetic proximity effect at Bi$_2$Se$_3$/EuS interface with broken inversion symmetry,"We investigate a magnetic proximity effect on Dirac surface states of
+topological insulator (TI) induced by a Bi$_2$Se$_3$/EuS interface, using
+density-functional theory (DFT) and a low-energy effective model, motivated by
+a recent experimental realization of the interface. We consider a thin
+ferromagnetic insulator EuS film stacked on top of Bi$_2$Se$_3$(111) slabs of
+three or five quintuple layers (QLs) with the magnetization of EuS normal to
+the interface ($z$ axis), which breaks both time-reversal and inversion
+symmetry. It is found that a charge transfer and surface relaxation makes the
+Dirac cones electron-doped. For both 3 and 5 QLs, the top-surface Dirac cone
+has an energy gap of 9 meV, while the bottom surface Dirac cone remains
+gapless. This feature is due to the short-ranged induced magnetic moment of the
+EuS film. For the 5 QLs, an additional Dirac cone with an energy gap of 2 meV
+is formed right below the bottom-surface Dirac point, while for 3 QLs, there is
+no additional Dirac cone. We also examine the spin-orbital texture of the Dirac
+surface states with broken inversion symmetry, using DFT and the effective
+model. We find that the $p_z$ orbital is coupled to the $z$ component of the
+spin moment in the opposite sign to the $p_x$ and $p_y$ orbitals. The $p_z$ and
+radial $p$ orbitals are coupled to the in-plane spin texture in the opposite
+handedness to the tangential $p$ orbital. The result obtained from the
+effective model agrees with our DFT calculations. The calculated spin-orbital
+texture may be tested from spin-polarized angle-resolved photoemission
+spectroscopy.",1407.6268v1
+2013-01-21,"Interatomic potentials, electric properties, and spectroscopy of the ground and excited states of the Rb_2 molecule: Ab initio calculations and effect of a non-resonant field","We formulate the theory for a diatomic molecule in a spatially degenerate
+electronic state interacting with a non-resonant laser field and investigate
+its rovibrational structure in the presence of the field. We report on
+\textit{ab initio} calculations employing the double electron attachment
+intermediate Hamiltonian Fock space coupled cluster method restricted to single
+and double excitations for all electronic states of the Rb$_2$ molecule up to
+$5s+5d$ dissociation limit of about 26.000$\,$cm$^{-1}$. In order to correctly
+predict the spectroscopic behavior of Rb$_2$, we have also calculated the
+electric transition dipole moments, non-adiabatic coupling and spin-orbit
+coupling matrix elements, and static dipole polarizabilities, using the
+multireference configuration interaction method. When a molecule is exposed to
+strong non-resonant light, its rovibrational levels get hybridized. We study
+the spectroscopic signatures of this effect for transitions between the
+X$^1\Sigma_g^+$ electronic ground state and the A$^1\Sigma_u^+$ and b$^3\Pi_u$
+excited state manifold. The latter is characterized by strong perturbations due
+to the spin-orbit interaction. We find that for non-resonant field strengths of
+the order $10^9$W/cm$^2$, the spin-orbit interaction and coupling to the
+non-resonant field become comparable. The non-resonant field can then be used
+to control the singlet-triplet character of a rovibrational level.",1301.4966v2
+2013-11-04,Interplay of many-body and single-particle interactions in iridates and rhodates,"Motivated by recent experiments exploring the spin-orbit-coupled magnetism in
+$4d$- and $5d$-band transition metal oxides, we study magnetic interactions in
+Ir- and Rh-based compounds. In these systems, the comparable strength of
+spin-orbit coupling (SOC), crystal field splitting (CF) and Coulomb and Hund's
+coupling leads to a rich variety of magnetic exchange interactions, leading to
+new types of ground states. Using a strong coupling approach, we derive
+effective low-energy super-exchange Hamiltonians from the multi-orbital Hubbard
+model by taking full account of the Coulomb and Hund's interactions in the
+intermediate states. We find that in the presence of strong SOC and lattice
+distortions the super-exchange Hamiltonian contains various kinds of magnetic
+anisotropies.
+  Here we are primarily interested in the magnetic properties of Sr$_2$IrO$_4$
+and Sr$_2$Ir$_{1-x}$Rh$_x$O$_4$ compounds. We perform a systematic study of how
+magnetic interactions in these systems depend on the microscopic parameters and
+provide a thorough analysis of the resulting magnetic phase diagram. Comparison
+of our results with experimental data shows good agreement. Finally, we discuss
+the parameter space in which the spin-flop transition in Sr$_2$IrO$_4$,
+experimentally observed under pressure, can be realized.",1311.0852v2
+2014-07-19,Supersymmetry in quantum optics and in spin-orbit coupled systems,"Light-matter interaction is naturally described by coupled bosonic and
+fermionic subsystems. This suggests that a certain Bose-Fermi duality is
+naturally present in the fundamental quantum mechanical description of photons
+interacting with atoms. We reveal submanifolds in parameter space of a basic
+light-matter interacting system where this duality is promoted to a
+supersymmetry (SUSY) which remains unbroken. We show that SUSY is robust with
+respect to decoherence and dissipation. In particular, a stationary density
+matrix at the supersymmetric lines in the parameter space has a degenerate
+subspace. A dimension of this subspace is given by the Witten index and thus
+topologically protected. As a consequence of this SUSY, dissipative dynamics at
+the supersymmetric lines is constrained by an additional conserved quantity
+which translates some part of information about an initial state into the
+stationary state subspace. We also demonstrate a robustness of this additional
+conserved quantity away from the supersymmetric lines. In addition, we
+demonstrate that the same SUSY structures are present in condensed matter
+systems with spin-orbit couplings of Rashba and Dresselhaus types, and
+therefore spin-orbit coupled systems at the SUSY lines should be robust with
+respect to various types of disorder and decoherences. Our findings suggest
+that optical and condensed matter systems at the SUSY points can be used for
+quantum information technology and can open an avenue for quantum simulation of
+the SUSY field theories.",1407.5213v1
+2015-05-04,Mixing of 0$^+$ and 0$^-$ observed in hyperfine and Zeeman structure of ultracold Rb$_2$ molecules,"We study the combination of hyperfine and Zeeman structure in the spin-orbit
+coupled $A^1\Sigma_u^+-b^3\Pi_u$ complex of $^{87}\textrm{Rb}_2$. For this
+purpose, absorption spectroscopy at a magnetic field around
+$B=1000\:\textrm{G}$ is carried out. We drive optical dipole transitions from
+the lowest rotational state of an ultracold Feshbach molecule to various
+vibrational levels with $0^+$ symmetry of the $A-b$ complex. In contrast to
+previous measurements with rotationally excited alkali-dimers, we do not
+observe equal spacings of the hyperfine levels. In addition, the spectra vary
+substantially for different vibrational quantum numbers, and exhibit large
+splittings of up to $160\:\textrm{MHz}$, unexpected for $0^+$ states. The level
+structure is explained to be a result of the repulsion between the states $0^+$
+and $0^-$ of $b^3\Pi_u$, coupled via hyperfine and Zeeman interactions. In
+general, $0^-$ and $0^+$ have a spin-orbit induced energy spacing $\Delta$,
+that is different for the individual vibrational states. From each measured
+spectrum we are able to extract $\Delta$, which otherwise is not easily
+accessible in conventional spectroscopy schemes. We obtain values of $\Delta$
+in the range of $\pm 100\:\textrm{GHz}$ which can be described by coupled
+channel calculations if a spin-orbit coupling is introduced that is different
+for $0^-$ and $0^+$ of $b^3\Pi_u$.",1505.00682v2
+2018-05-07,Theory of electronic magnetoelectric coupling in $d^5$ Mott insulators,"Motivated by recent terahertz (THz) spectroscopy measurements in
+$\alpha$-RuCl$_3$, we develop a theory for magnetoelectric (ME) effects in Mott
+insulators of $d^5$ transition metal ions in an octahedral crystal field. For
+$4d$ and $5d$ compounds, the relatively wide-spread orbitals favor charge
+fluctuations of localized electrons to neighboring ions and a significant ME
+effect from electronic mechanisms is expected. From a three-orbital Hubbard
+model with strong spin-orbit coupling, we derive the mechanisms for the
+electric polarization originating from virtual hopping of the localized holes
+carrying the spins. We consider the electric polarization generated by pairs of
+spin operators on nearest neighbor bonds with either an edge-sharing geometry
+(i.e., two ligands are shared) or a corner-sharing geometry (i.e., one ligand
+is shared). The allowed couplings are first derived using a symmetry approach.
+Then, we explicitly calculate the coupling constants and evaluate the effective
+polarization operator in the ground state manifold using perturbation theory
+and exact diagonalization. The results are relevant when considering the THz
+optical conductivity of magnetic systems such as some perovskite iridates or
+Kitaev materials. In particular, they help explain the recent THz optical
+measurements of $\alpha$-RuCl$_{3}$ for which the electric-dipole-induced
+contribution has been shown to be strong.",1805.02488v2
+2018-05-24,Antiferromagnetically assisted electron-phonon coupling and spin-lattice interaction in Fe-based superconductors,"We present a theoretical ab-initio approach that allows us to explicitly
+calculate the superconducting transition temperatures (Tc) of the iron-based
+superconductors of LaFeAsO1-xFx, SmFeAsO1-xFx, NdFeAsO1-xFx, Ba1-xKxFe2As2,
+FeSe and LiFeAs that fit perfectly with the experiments. We consider recent
+evidence that electron-phonon coupling may have been underestimated previously,
+and a prediction that antiferromagnetism can greatly enhance electron-phonon
+coupling through localized iron d orbitals. We then include the contribution of
+these localized orbitals in a McMillan formalism. In addition, we take into
+account the spin-lattice interaction between the spin-polarized electrons at
+the Fermi surface and the iron orbitals in combination with a modified exchange
+Hamiltonian involving a ferrimagnetic coupling between Fe and As. With this
+approach we can accurately calculate the Tc of FeSe (11 family), LiFeAs (111
+family), LaFeAsO0.9F0.1 (1111 family) and BaFe2As2 (122 family) as a function
+of pressure. In addition, we also obtain the correct doping dependence of Tc of
+LaFeAsO0.9F0.1 (1111 family) and BaFe2As2 (122 family).",1805.09754v5
+2020-04-27,Soft and anisotropic local moments in 4$d$ and 5$d$ mixed-valence M$_2$O$_9$ dimers,"We investigate via exact diagonalization of finite clusters the electronic
+structure and magnetism of M$_2$O$_9$ dimers in the mixed-valence hexagonal
+perovskites A$_3$B'M$_2$O$_9$ for various different fillings of 4$d$ and 5$d$
+transition-metal M ions. We find that the magnetic moments of such dimers are
+determined by a subtle interplay of spin-orbit coupling, Hund's coupling, and
+Coulomb repulsion, as well as the electron filling of the M ions. Most
+importantly, the magnetic moments are anisotropic and temperature-dependent.
+This behavior is a result of spin-orbit coupling, magnetic field effects, and
+the existence of several nearly-degenerate electronic configurations whose
+proximity allows occupation of excited states already at room temperature. This
+analysis is consistent with experimental susceptibility measurements for a
+variety of dimer-based materials. Furthermore, we perform a survey of
+A$_3$B'M$_2$O$_9$ materials and propose ground-state phase diagrams for the
+experimentally relevant M fillings of $d^{4.5}$, $d^{3.5}$ and $d^{2.5}$.
+Finally, our results show that the usually applied Curie-Weiss law with a
+constant magnetic moment cannot be used in these spin-orbit-coupled materials.",2004.13050v1
+2018-06-16,Observation of quantum phase transition in spin-orbital-angular-momentum coupled Bose-Einstein condensate,"Orbital angular momentum (OAM) of light represents a fundamental optical
+freedom that can be exploited to manipulate quantum state of atoms. In
+particular, it can be used to realize spin-orbital-angular-momentum (SOAM)
+coupling in cold atoms by inducing an atomic Raman transition using two laser
+beams with differing OAM. Rich quantum phases are predicted to exist in
+many-body systems with SOAM coupling. Their observations in laboratory,
+however, are often hampered by the limited control of the system parameters. In
+this work we report, for the first time, the experimental observation of the
+ground-state quantum phase diagram of the SOAM coupled Bose-Einstein condensate
+(BEC). The discontinuous variation of the spin polarization as well as the
+vorticity of the atomic wave function across the phase boundaries provides
+clear evidence of first-order phase transitions. Our results open up a new way
+to the study of phase transitions and exotic quantum phases in quantum gases.",1806.06263v2
+2020-06-04,Contribution of the rho meson and quark sub-structure to the nuclear spin-orbit potential,"The microscopic origin of the spin-orbit (SO) potential in terms of
+sub-baryonic degrees of freedom is explored and discussed for application to
+nuclei and hyper-nuclei. We thus develop a chiral relativistic approach where
+the coupling to the scalar- and vector-meson fields are controlled by the quark
+substructure. This approach suggests that the isoscalar and isovector density
+dependence of the SO potential can be used to test the microscopic ingredients
+which are implemented in the relativistic framework: the quark substructure of
+the nucleon in its ground-state and its coupling to the rich meson sector where
+the $\rho$ meson plays a crucial role. This is also in line with the Vector
+Dominance Model (VDM) phenomenology and the known magnetic properties of the
+nucleons. We explore predictions based on Hartree and Hartree-Fock mean field,
+as well as various scenarios for the $\rho$-nucleon coupling, ranked as weak,
+medium and strong, which impacts the isoscalar and isovector density dependence
+of the SO potential. We show that a medium to strong $\rho$ coupling is
+essential to reproduce Skyrme phenomenology in $N=Z$ nuclei as well as its
+isovector dependence. Assuming an SU(6) valence quark model our approach is
+extended to hyperons and furnishes a microscopic understanding of the quenching
+of the $N\Lambda$ spin-orbit potential in hyper-nuclei. It is also applied to
+other hyperons, such as $\Sigma$, $\Xi$ and $\Omega$.",2006.02698v2
+2021-10-15,Ground state of Ce$_{3}$Bi$_{4}$Pd$_{3}$ unraveled by hydrostatic pressure,"Noncentrosymmetric Ce$_{3}$Bi$_{4}$Pd$_{3}$ has attracted a lot of attention
+as a candidate for strongly correlated topological material, yet its
+experimental ground state remains a matter of contention. Two conflicting
+scenarios have emerged from a comparison to prototypical Kondo insulator
+Ce$_{3}$Bi$_{4}$Pt$_{3}$: either Ce$_{3}$Bi$_{4}$Pd$_{3}$ is a
+spin-orbit-driven topological semimetal or a Kondo insulator with smaller Kondo
+coupling than its Pt counterpart. Here we determine the ground state of
+Ce$_{3}$Bi$_{4}$Pd$_{3}$ via electrical resistivity measurements under
+hydrostatic pressure, which is a clean symmetry-preserving tuning parameter
+that increases hybridization but virtually preserves spin-orbit coupling.
+Ce$_{3}$Bi$_{4}$Pd$_{3}$ becomes more insulating under pressure, which is a
+signature of Ce-based Kondo insulating materials. Its small zero-pressure gap
+increases quadratically with pressure, similar to the behavior observed in the
+series Ce$_{3}$Bi$_{4}$(Pt$_{1-x}$Pd$_{x}$)$_{3}$, which indicates that Pt
+substitution and applied pressure have a similar effect. Our result not only
+demonstrates that Kondo coupling, rather than spin-orbit coupling, is the main
+tuning parameter in this class of materials, but it also establishes that
+Ce$_{3}$Bi$_{4}$Pd$_{3}$ has a narrow-gap Kondo insulating ground state.",2110.08230v1
+2022-10-13,Spin-orbit coupling controlling the superconducting dome of artificial superlattices of quantum wells,"While it is known that a resonant amplification of Tc in two-gap
+superconductors can be driven by using the Fano-Feshbach resonance tuning the
+chemical potential near a Lifshitz transition, little is known on tuning the Tc
+resonance by cooperative interplay of the Rashba spin-orbit coupling (RSOC)
+joint with phonon mediated (e-ph) pairing at selected k-space spots. Here we
+present first-principles quantum calculation of superconductivity in an
+artificial heterostructure of metallic quantum wells with 3 nm period where
+quantum size effects give two-gap superconductivity with RSOC controlled by the
+internal electric field at the interface between the nanoscale metallic layers
+intercalated by insulating spacer layers. The key results of this work show
+that fundamental quantum mechanics effects including RSCO at the nanoscale
+(Mazziotti et al Phys. Rev. B, 103, 024523, 2021) provide key tools in applied
+physics for quantitative material design of unconventional high temperature
+superconductors at ambient pressure. We discuss the superconducting domes where
+Tc is a function of either the Lifshitz parameter (?) measuring the distance
+from the topological Lifshitz transition for the appearing of a new small Fermi
+surface due to quantum size effects with finite spin-orbit coupling and the
+variable e-ph coupling g in the appearing second Fermi surface linked with the
+softening of the phonon energy cut off.",2211.11547v1
+2015-04-15,Proposed method to realize the $p$-wave superfluid state using a $s$-wave superfluid Fermi gas with a synthetic spin-orbit interaction,"We theoretically propose an idea to reach the $p$-wave superfluid phase in an
+ultracold Fermi gas. The key of our idea is that the pairing symmetry of a
+Fermi superfluid is fully dominated by the symmetry of the superfluid order
+parameter, which is essentially given by the product of a pair amplitude and a
+pairing interaction. Noting this, in our proposal, we first prepare a $p$-wave
+pair amplitude by, not using a $p$-wave interaction, but using the phenomenon
+that a $p$-wave pair amplitude is induced in an $s$-wave superfluid Fermi gas
+with antisymmetric spin-orbit interaction. In this case, although the system is
+still in the $s$-wave superfluid state with the $s$-wave superfluid order
+parameter, when one suddenly replaces the $s$-wave interaction by an
+appropriate $p$-wave one (which is possible in cold Fermi gases by using a
+Feshbach resonance technique), the product of the $p$-wave interaction and the
+$p$-wave pair amplitude that has already been prepared in the spin-orbit
+coupled $s$-wave superfluid state immediately gives a finite $p$-wave
+superfluid order parameter. Thus, at least just after this manipulation, the
+system is in the $p$-wave superfluid state, being characterized by the
+artificially produced $p$-wave superfluid parameter. In this paper, to assess
+our idea, we evaluate the $p$-wave pair amplitude in a spin-orbit coupled
+$s$-wave superfluid Fermi gas at $T=0$. We determine the region where a large
+$p$-wave pair amplitude is obtained in the phase diagram with respect to the
+strengths of the $s$-wave pairing interaction and the spin-orbit coupling. We
+also discuss the accessibility of this optimal region on the viewpoint of the
+superfluid phase transition temperature. Since the achievement of a $p$-wave
+superfluid Fermi gas is one of the most crucial issues in cold atom physics,
+our proposal would be useful for this exciting challenge.",1504.03835v1
+2016-02-01,$π$ Spin Berry Phase in a Quantum-Spin-Hall-Insulator-Based Interferometer: Evidence for the Helical Spin Texture of the Edge States,"Quantum spin Hall insulator is characterized by the helical edge states, with
+the spin polarization of electron being locked to its direction of motion.
+Although the edge-state conduction has been observed, unambiguous evidence of
+the helical spin texture is still lacking. Here, we investigate the coherent
+edge-state transport in an interference loop pinched by two point contacts. Due
+to the helical character, the forward inter-edge scattering enforces a $\pi$
+spin rotation. Two successive processes can only produce a nontrivial $2\pi$ or
+trivial $0$ spin rotation, which can be controlled by the Rashba spin-orbit
+coupling. The nontrivial spin rotation results in a geometric $\pi$ Berry
+phase, which can be detected by a $\pi$ phase shift of the conductance
+oscillation relative to the trivial case. Our results provide a smoking gun
+evidence for the helical spin texture of the edge states. Moreover, it also
+provides the opportunity to all-electrically explore the trajectory-dependent
+spin Berry phase in condensed matter.",1602.00497v2
+2019-10-29,Origin of the Magnetic Spin Hall Effect: Spin Current Vorticity in the Fermi Sea,"The interplay of spin-orbit coupling (SOC) and magnetism gives rise to a
+plethora of charge-to-spin conversion phenomena that harbor great potential for
+spintronics applications. In addition to the spin Hall effect, magnets may
+exhibit a magnetic spin Hall effect (MSHE), as was recently discovered [Kimata
+\textit{et al.}, Nature \textbf{565}, 627-630 (2019)]. To date, the MSHE is
+still awaiting its intuitive explanation. Here we relate the MSHE to the
+vorticity of spin currents in the Fermi sea, which explains pictorially the
+origin of the MSHE. For all magnetic Laue groups that allow for nonzero spin
+current vorticities the related tensor elements of the MSH conductivity are
+given. Minimal requirements for the occurrence of a MSHE are compatibility with
+either a magnetization or a magnetic toroidal quadrupole. This finding implies
+in particular that the MSHE is expected in all ferromagnets with sufficiently
+large SOC. To substantiate our symmetry analysis, we present various models, in
+particular a two-dimensional magnetized Rashba electron gas, that corroborate
+an interpretation by means of spin current vortices. Considering thermally
+induced spin transport and the magnetic spin Nernst effect in magnetic
+insulators, which are brought about by magnons, our findings for electron
+transport can be carried over to the realm of spincaloritronics, heat-to-spin
+conversion, and energy harvesting.",1910.13375v1
+2020-04-11,Understanding the mechanism of oxygen evolution reaction (OER) with the consideration of spin,"Oxygen evolution reaction (OER) with intractable high overpotential is the
+rate-limiting step for rechargeable metal-air battery, water electrolysis
+systems, and solar fuels devices. There exists a spin state transition from
+spin singlet OH-/H2O reactant to spin triplet O2 product, which has not
+received enough attention yet. In this perspective, we attempt to retrospect
+electron behaviours during the whole OER process, with the consideration of
+spin attribute. Regardless of the adopted mechanisms by different
+electrocatalysts, for example, adsorbate evolution mechanism (AEM) or lattice
+oxygen mechanism (LOM), the underlying rationale is that active sites have to
+extract three in four electrons with the same spin direction before the
+formation of O=O. This spin-sensitive nature of OER superimposes additional
+high requirements on the electrocatalysts, especially on the spin structure, to
+compliment the fast electron transfer in the interface with spin selection and
+smoothly delivery afterwards. When optimizing the geometric and electronic
+structures catering for the spin-sensitive OER, awareness of the couplings
+between spin, charge, orbital and lattice is necessary. Some spin-correlated
+physical properties, such as (1) crystal field, (2) coordination, (3)
+oxidation, (4) bonding, (5) eg electron number, (6) conductivity and (7)
+magnetism, are also discussed briefly. It is hoped that our perspective could
+shed lights on the underlying physics of the slow kinetics of OER, providing a
+rational guidance for more effective energy conversion electrocatalysts
+designs.",2004.05326v1
+2018-08-02,Temperature and electric field dependence of spin relaxation in graphene on SrTiO$_3$,"The theoretically predicted intrinsic spin relaxation time of up to 1 $\mu s$
+in graphene along with extremely high mobilities makes it a promising material
+in spintronics. In spite of extensive experimental studies of spin relaxation
+and understanding of its precise mechanism, it is still unclear as to why the
+spin lifetime in graphene is three orders of magnitude below the theoretical
+predictions. Central to this discrepancy is the role of the local environment
+including that of the underlying substrate. In this work, we use the
+electronically rich platform SrTiO$_3$ and study its suitability in supporting
+spin transport in graphene. We find spin relaxation time and length as large as
+1.2 $\pm$ 0.1 ns and 5.6 $\pm$ 0.5 $\mu m$ respectively at 290 K in graphene on
+SrTiO$_3$ using a non-local measurement scheme. We analyze the temperature
+variation of the spin transport parameters in graphene and attribute the
+temperature dependence of the spin transport parameters in graphene to spin
+orbit coupling or structural phase transition in SrTiO$_3$. Furthermore, from
+the gate dependence of the spin transport parameters, the relation between spin
+relaxation time and momentum relaxation time is extracted; the Elliot-Yaffet
+and D'Yakonov-Perel' spin relaxation rates are found to be of similar order.",1808.00832v2
+2019-11-15,Strain-induced spin-nematic state and nematic susceptibility arising from $2\times2$ Fe clusters in KFe$_{0.8}$Ag$_{1.2}$Te$_2$,"Spin nematics break spin-rotational symmetry while maintaining time-reversal
+symmetry, analogous to liquid crystal nematics that break spatial rotational
+symmetry while maintaining translational symmetry. Although several candidate
+spin nematics have been proposed, the identification and characterization of
+such a state remain challenging because the spin-nematic order parameter does
+not couple directly to experimental probes. KFe$_{0.8}$Ag$_{1.2}$Te$_2$
+(K$_5$Fe$_4$Ag$_6$Te$_{10}$, KFAT) is a local-moment magnet consisting of
+well-separated 2$\times$2 Fe clusters, and in its ground state the clusters
+order magnetically, breaking both spin-rotational and time-reversal symmetries.
+Using uniform magnetic susceptibility and neutron scattering measurements we
+find a small strain induces sizable spin anisotropy in the paramagnetic state
+of KFAT, manifestly breaking spin-rotational symmetry while retaining
+time-reversal symmetry, resulting in a strain-induced spin-nematic state in
+which the $2\times2$ clusters act as the spin analogue of molecules in a liquid
+crystal nematic. The strain-induced spin anisotropy in KFAT allows us to probe
+its nematic susceptibility, revealing a divergent-like increase upon cooling,
+indicating the ordered ground state is driven by a spin-orbital entangled
+nematic order parameter.",1911.06492v1
+2020-11-05,Nanophotonic structures with optical surface modes for tunable spin current generation,"Heat generated by spin currents in spintronics-based devices is typically
+much less than that generated by charge current flows in conventional
+electronic devices. However, the conventional approaches for excitation of spin
+currents based on spin-pumping and spin Hall effect are limited in efficiency
+which restricts their application for viable spintronic devices. We propose a
+novel type of photonic-crystal (PC) based structures for efficient and tunable
+optically-induced spin current generation via the Spin Seebeck and inverse spin
+Hall effects. It is experimentally demonstrated that optical surface modes
+localized at the PC surface covered by ferromagnetic layer and materials with
+giant spin-orbit coupling (SOC) notably increase the efficiency of the
+optically-induced spin current generation and provides its tunability by
+modifying light wavelength or angle of incidence. Up to 100% of the incident
+light power can be transferred to heat within the SOC layer and, therefore, to
+spin current. Importantly, high efficiency becomes accessible even for
+ultra-thin SOC layers. Moreover, surface patterning of the PC-based spintronic
+nanostructure allows local generation of spin currents at the pattern scales
+rather than diameter of the laser beam.",2011.02770v2
+2021-02-23,Highly persistent spin textures with giant tunable spin splitting in the two-dimensional germanium monochalcogenides,"The ability to control the spin textures in semiconductors is a fundamental
+step toward novel spintronic devices, while seeking desirable materials
+exhibiting persistent spin texture (PST) remains a key challenge. The PST is
+the property of materials preserving a unidirectional spin orientation in the
+momentum space, which has been predicted to support an extraordinarily long
+spin lifetime of carriers. Herein, by using first-principles density functional
+theory calculations, we report the emergence of the PST in the two-dimensional
+(2D) germanium monochalcogenides (GeMC). By considering two stable formations
+of the 2D GeMC, namely the pure GeX and Janus Ge2XY monolayers (X, Y = S, Se,
+and Te), we observed the PST around the valence band maximum where the spin
+orientation is enforced by the lower point group symmetry of the crystal. In
+the case of the pure GeX monolayers, we found that the PST is characterized by
+fully out-of-plane spin orientation protected by C2v point group, while the
+canted PST in the y-z plane is observed in the case of the Janus Ge2XY
+monolayers due to the lowering symmetry into Cs point group. More importantly,
+we find large spin-orbit coupling (SOC) parameter in which the PST sustains,
+which could be effectively tuned by in-plane strain. The large SOC parameter
+observed in the present systems leads to the small wavelength of the spatially
+periodic mode of the spin polarization, which is promising for short spin
+channel in the spin Hall transistor devices.",2102.11618v2
+2022-06-21,Anisotropic spin Hall and spin Nernst effects in bismuth semimetal,"Bismuth is an archetypal semimetal with gigantic spin-orbit coupling and it
+has been a major source material for the discovery of seminal phenomena in
+solid state physics for more than a century. In recent years, spin current
+transports in bismuth have also attracted considerable attention. In this
+paper, we theoretically study both spin Hall effect (SHE) and spin Nernst
+effect (SNE) in bismuth, based on relativistic band structure calculations.
+First, we find that there are three independent tensor elements of spin Hall
+conductivity (SHC) and spin Nernst conductivity (SNC), namely, $Z_{yx}^z$,
+$Z_{xz}^y$, and $Z_{zy}^x$. We calculate all the elements as a function of the
+Fermi energy. Second, we find that all SHC tensor elements are large, being
+$\sim$1000 ($\hbar$/e)(S/cm) and comparable to that of platinum. Furthermore,
+because of its low electrical conductivity, the corresponding spin Hall angles
+are gigantic, being $\sim$20%. Third, all the calculated SNC tensor elements
+are also pronounced, being comparable to that [$\sim$0.13 ($\hbar$/e)(A/m-K)]
+of gold, although they are several times smaller than platinum and $\beta$-Ta.
+Finally, in contrast to Pt and Au where $Z_{yx}^z = Z_{xz}^y = Z_{zy}^x$, the
+SHE and SNE in bismuth are strongly anisotropic, i.e., $Z_{yx}^z$, $Z_{xz}^y$
+and $Z_{zy}^x$ differ significantly. Consequently, the Hall voltages due to the
+inverse SHE and SNE from the different conductivity elements could cancel each
+other and thus result in a small spin Hall angle if polycrystalline samples are
+used, which may explain why the measured spin Hall angles ranging from nearly 0
+to 25% have been reported. We hope that these interesting findings would
+stimulate further spin current experiments on bismuth using highly oriented
+single crystal specimens.",2206.10149v2
+2022-06-22,Chirality and Rashba-related effects in the spin texture of a 2D centro-symmetric ferromagnet: the case of CrI3 bilayer,"The newly discovered two-dimensional magnetic semiconductors such as CrI$_3$
+have triggered a surge of interest stemming from their exotic spin-dependent
+properties and potential applications in spintronics and
+magneto-optoelectronics. Using first-principle density-functional-theory
+calculations, we investigate the properties of the spin-polarization texture in
+momentum space in the prototype 2D centrosymmetric ferromagnetic (FM) bilayer
+of CrI$_3$, with perpendicular magnetization. The FM bilayer displays a rich
+in-plane spin texture in its highest valence bands. We show the existence of
+two distinct spin canting effects, which result from the coupling of FM order
+with structural chirality and electric polarization, in establishing the
+in-plane spin texture. The first effect is generated by the chirality of the
+layer stacking and the spin-orbit-polarized nature of the valence states, and
+yields the same canting on both layers. The second effect is a Rashba-related
+effect, which in a centrosymmetric ferromagnet induces in a single electronic
+state two opposite spin-canted components on the two layers. Furthermore, using
+the FM bilayer as an example, we provide general rules imposed by
+magnetic-space-group symmetries on spin-polarization vectors, serving as
+guidelines for the shape of the spin texture in the Brillouin zone of magnetic
+crystals. Finally, we show that the above effects can be effectively used to
+manipulate the spin texture via compressive strain, which induces in the FM
+bilayer valence-band-edge states with canted spins.",2206.10777v2
+2022-07-06,Local Symmetry Breaking Drives Picosecond Spin Domain Formation in Polycrystalline Semiconducting Films,"Photoinduced spin-charge interconversion in semiconductors with spin-orbit
+coupling could provide a route to optically addressable spintronics without the
+use of external magnetic fields. A central question is whether the resulting
+spin-associated charge currents are robust to structural disorder, which is
+inherent to polycrystalline semiconductors that are desirable for device
+applications. Using femtosecond circular polarization-resolved pump-probe
+microscopy on polycrystalline halide perovskite thin films, we observe the
+photoinduced ultrafast formation of spin-polarized positive and, unexpectedly,
+negative spin domains on the micron scale formed through lateral currents.
+Further, the polarization of these domains and lateral transport direction is
+switched upon switching the polarization of the pump helicity. Micron scale
+variations in the intensity of optical second-harmonic generation and vertical
+piezoresponse suggest that the spin domain formation is driven by the presence
+of strong local inversion symmetry breaking via inter-grain structural
+disorder. We propose that this leads to spatially varying Rashba-like spin
+textures that drive spin-momentum locked currents, leading to local spin
+accumulation. Our results establish ultrafast spin domain formation in
+polycrystalline semiconductors as a new optically addressable platform for
+nanoscale spin-device physics.",2207.02765v1
+2023-05-02,Gate-tunable spin Hall effect in an all-light-element heterostructure: graphene with copper oxide,"Graphene is a light material for long-distance spin transport due to its low
+spin-orbit coupling, which at the same time is the main drawback to exhibit a
+sizeable spin Hall effect. Decoration by light atoms has been predicted to
+enhance the spin Hall angle in graphene while retaining a long spin diffusion
+length. Here, we combine a light metal oxide (oxidized Cu) with graphene to
+induce the spin Hall effect. Its efficiency, given by the product of the spin
+Hall angle and the spin diffusion length, can be tuned with the Fermi level
+position, exhibiting a maximum (1.8 $\pm$ 0.6 nm at 100 K) around the charge
+neutrality point. This all-light-element heterostructure shows a larger
+efficiency than conventional spin Hall materials. The gate-tunable spin Hall
+effect is observed up to room temperature. Our experimental demonstration
+provides an efficient spin-to-charge conversion system free from heavy metals
+and compatible with large-scale fabrication.",2305.01787v2
+2023-09-07,Coherent spin dynamics between electron and nucleus within a single atom,"The nuclear spin, being much more isolated from the environment than its
+electronic counterpart, enables quantum experiments with prolonged coherence
+times and presents a gateway towards uncovering the intricate dynamics within
+an atom. These qualities have been demonstrated in a variety of nuclear spin
+qubit architectures, albeit with limited control over the direct environment of
+the nuclei. As a contrasting approach, the combination of electron spin
+resonance (ESR) and scanning tunnelling microscopy (STM) provides a bottom-up
+platform to study the fundamental properties of nuclear spins of single atoms
+on a surface. However, access to the time evolution of these nuclear spins, as
+was recently demonstrated for electron spins, remained a challenge. Here, we
+present an experiment resolving the nanosecond coherent dynamics of a
+hyperfine-driven flip-flop interaction between the spin of an individual
+nucleus and that of an orbiting electron. We use the unique local
+controllability of the magnetic field emanating from the STM probe tip to bring
+the electron and nuclear spins in tune, as evidenced by a set of avoided level
+crossings in ESR-STM. Subsequently, we polarize both spins through scattering
+of tunnelling electrons and measure the resulting free evolution of the coupled
+spin system using a DC pump-probe scheme. The latter reveals a complex pattern
+of multiple interfering coherent oscillations, providing unique insight into
+the atom's hyperfine physics. The ability to trace the coherent hyperfine
+dynamics with atomic-scale structural control adds a new dimension to the study
+of on-surface spins, offering a pathway towards dynamic quantum simulation of
+low-dimensional magnonics.",2309.03749v1
+2023-11-22,Isotropic spin and inverse spin Hall effect in epitaxial (111)-oriented Pt/Co bilayers,"The spin-to-charge current interconversion in bilayers composed of
+ferromagnetic and nonmagnetic layers with strong spin-orbit coupling has
+garnered considerable attention due to its exceptional potential in advancing
+spintronics devices for data storage and logic applications. Platinum (Pt)
+stands out as one of the most effective materials for generating spin current.
+While the spin conversion efficiency is isotropic in polycrystalline Pt
+samples, an ongoing debate persists regarding its dependence on the crystalline
+direction in single crystalline samples. In this study, we aim to
+comprehensively evaluate the in-plane anisotropy of spin-charge interconversion
+using an array of complementary Spin Hall and inverse Spin Hall techniques with
+both incoherent and coherent excitation. Specifically, we investigate the
+spin-to-charge interconversion in epitaxial, (111)-oriented, Co/Pt bilayers
+with low surface roughness, as resulted from x-ray experiments. By varying the
+thickness of the Pt layer, we gain insights into the spin-charge
+interconversion in epitaxial Pt and highlight the effects of the interfaces.
+Our results demonstrate an isotropic behavior within the limits of our
+detection uncertainty. This finding significantly enhances our understanding of
+spin conversion in one of the most relevant systems in spintronics and paves
+the way for future research in this field.",2311.13400v1
+2023-10-12,Extreme mass-ratio inspiral and waveforms for a spinning body into a Kerr black hole via osculating geodesics and near-identity transformations,"Understanding the orbits of spinning bodies in curved spacetime is important
+for modeling binary black hole systems with small mass ratios. At zeroth order
+in mass ratio, the smaller body moves on a geodesic. Post-geodesic effects are
+needed to model the system accurately. One very important post-geodesic effect
+is the gravitational self-force, which describes the small body's interaction
+with its own contribution to a binary's spacetime. Another post-geodesic
+effect, the spin-curvature force, is due to the smaller body's spin coupling to
+spacetime curvature. In this paper, we combine the leading orbit-averaged
+backreaction of point-particle gravitational-wave emission with the
+spin-curvature force to construct the worldline and gravitational waveform for
+a spinning body spiraling into a Kerr black hole. We use an osculating geodesic
+integrator, which treats the worldline as evolution through a sequence of
+geodesic orbits, as well as near-identity transformations, which eliminate
+dependence on orbital phases, allowing for fast computation of inspirals. The
+resulting inspirals and waveforms include all critical dynamical effects which
+govern such systems (orbit and precession frequencies, inspiral, strong-field
+gravitational-wave amplitudes), and as such form an effective first model for
+the inspiral of spinning bodies into Kerr black holes. We emphasize that our
+present calculation is not self consistent, since we neglect effects which
+enter at the same order as effects we include. However, our analysis
+demonstrates that the impact of spin-curvature forces can be incorporated into
+EMRI waveform tools with relative ease. The calculation is sufficiently modular
+that it should not be difficult to include neglected post-geodesic effects as
+efficient tools for computing them become available. (Abridged)",2310.08438v1
+2018-08-29,Fast spin exchange between two distant quantum dots,"The Heisenberg exchange interaction between neighboring quantum dots allows
+precise voltage control over spin dynamics, due to the ability to precisely
+control the overlap of orbital wavefunctions by gate electrodes. This allows
+the study of fundamental electronic phenomena and finds applications in quantum
+information processing. Although spin-based quantum circuits based on
+short-range exchange interactions are possible, the development of scalable,
+longer-range coupling schemes constitutes a critical challenge within the
+spin-qubit community. Approaches based on capacitative coupling and
+cavity-mediated interactions effectively couple spin qubits to the charge
+degree of freedom, making them susceptible to electrically-induced decoherence.
+The alternative is to extend the range of the Heisenberg exchange interaction
+by means of a quantum mediator. Here, we show that a multielectron quantum dot
+with 50-100 electrons serves as an excellent mediator, preserving speed and
+coherence of the resulting spin-spin coupling while providing several
+functionalities that are of practical importance. These include speed (mediated
+two-qubit rates up to several gigahertz), distance (of order of a micrometer),
+voltage control, possibility of sweet spot operation (reducing susceptibility
+to charge noise), and reversal of the interaction sign (useful for dynamical
+decoupling from noise).",1808.09736v1
+2007-06-01,Strongly modulated transmission of a spin-split quantum wire with local Rashba interaction,"We investigate the transport properties of ballistic quantum wires in the
+presence of Zeeman spin splittings and a spatially inhomogeneous Rashba
+interaction. The Zeeman interaction is extended along the wire and produces
+gaps in the energy spectrum which allow electron propagation only for spinors
+lying along a certain direction. For spins in the opposite direction the waves
+are evanescent far away from the Rashba region, which plays the role of the
+scattering center. The most interesting case occurs when the magnetic field is
+perpendicular to the Rashba field. Then, the spins of the asymptotic
+wavefunctions are not eigenfunctions of the Rashba Hamiltonian and the
+resulting coupling between spins in the Rashba region gives rise to sudden
+changes of the transmission probability when the Fermi energy is swept along
+the gap. After briefly examining the energy spectrum and eigenfunctions of a
+wire with extended Rashba coupling, we analyze the transmission through a
+region of localized Rashba interaction, in which a double interface separates a
+region of constant Rashba interaction from wire leads free from spin-orbit
+coupling. For energies slightly above the propagation threshold, we find the
+ubiquitous occurrence of transmission zeros (antiresonances) which are analyzed
+by matching methods in the one-dimensional limit. We find that a a minimal
+tight-binding model yields analytical transmission lineshapes of Fano
+antiresonance type. More general angular dependences of the external magnetic
+field is treated within projected Schroedinger equations with Hamiltonian
+matrix elements mixing wavefunction components. Finally, we consider a
+realistic quantum wire where the energy subbands are coupled via the Rashba
+intersubband coupling term and discuss its effect on the transmission zeros.",0706.0107v1
+2011-07-22,Dynamical Tides in Eccentric Binaries and Tidally-Excited Stellar Pulsations in KEPLER KOI-54,"Recent observation of the tidally-excited stellar oscillations in the
+main-sequence binary KOI-54 by the KEPLER satellite provides a unique
+opportunity for studying dynamical tides in eccentric binary systems. We
+develop a general theory of tidal excitation of oscillation modes of rotating
+binary stars, and apply our theory to tidally excited gravity modes (g-modes)
+in KOI-54. The strongest observed oscillations, which occur at 90 and 91 times
+the orbital frequency, are likely due to prograde m=2 modes (relative to the
+stellar spin axis) locked in resonance with the orbit. The remaining flux
+oscillations with frequencies that are integer multiples of the orbital
+frequency are likely due to nearly resonant m=0 g-modes; such axisymmetric
+modes generate larger flux variations compared to the m=2 modes, assuming that
+the spin inclination angle of the star is comparable to the orbital inclination
+angle. We examine the process of resonance mode locking under the combined
+effects of dynamical tides on the stellar spin and orbit and the intrinsic
+stellar spindown. We show that KOI-54 can naturally evolve into a state in
+which at least one m=2 mode is locked in resonance with the orbital frequency.
+Our analysis provides an explanation for the fact that only oscillations with
+frequencies less than 90-100 times the orbital frequency are observed. We have
+also found evidence from the published KEPLER result that three-mode nonlinear
+coupling occurs in the KOI-54 system. We suggest that such nonlinear mode
+coupling may explain the observed oscillations that are not harmonics of the
+orbital frequency.",1107.4594v3
+2015-01-20,Anomalous High-Energy Waterfall-Like Electronic Structure in 5d Transition Metal Oxide Sr2IrO4 with a Strong Spin-Orbit Coupling,"The layered 5d transition metal oxides like Sr2IrO4 have attracted
+significant interest recently due to a number of exotic and new phenomena
+induced by the interplay between the spin-orbit coupling, bandwidth W and
+on-site Coulomb correlation U. In contrast to a metallic behavior expected from
+the Mott-Hubbard model due to more spatially extended 5d orbitals and moderate
+U, an insulating ground state has been observed in Sr2IrO4. Such an insulating
+behavior can be understood by an effective J_eff=1/2 Mott insulator model by
+incorporating both electron correlation and strong spin-orbital coupling,
+although its validity remains under debate at present. In particular, Sr2IrO4
+exhibits a number of similarities to the high temperature cuprate
+superconductors in the crystal structure, electronic structure, magnetic
+structure, and even possible high temperature superconductivity. Here we report
+a new observation of the anomalous high energy electronic structure in Sr2IrO4.
+By taking high-resolution angle-resolved photoemission measurements on Sr2IrO4
+over a wide energy range, we have revealed that the high energy electronic
+structures show unusual nearly-vertical bands that extend over a large energy
+range. Such anomalous high energy behaviors resemble the high energy waterfall
+features observed in the cuprate superconductors, adding one more important
+similarity between these two systems. While strong electron correlation plays
+an important role in producing high energy waterfall features in the cuprate
+superconductors, the revelation of the high energy anomalies in Sr2IrO4 points
+to a novel route in generating exotic electronic excitations from the strong
+spin-orbit coupling and a moderate electron correlation.",1501.04687v1
+1997-03-25,Phase Diagram of the Half-Filled Extended Hubbard Model in Two Dimensions,"We consider an extended Hubbard model of interacting fermions on a lattice.
+The fermion kinetic energy corresponds to a tight binding Hamiltonian with
+nearest neighbour (-t) and next nearest neighbour (t') hopping matrix elements.
+In addition to the onsite Hubbard interaction (U) we also consider a nearest
+neighbour repulsion (V). We obtain the zero temperature phase diagram of our
+model within the Hartree-Fock approximation. We consider ground states having
+charge and spin density wave ordering as well as states with orbital
+antiferromagnetism or spin nematic order. The latter two states correspond to
+particle-hole binding with $d_{x^2-y^2}$ symmetry in the charge and spin
+channels respectively. For $t' = 0$, only the charge density wave and spin
+density wave states are energetically stable. For non-zero t', we find that
+orbital antiferromagnetism (or spin nematic) order is stable over a finite
+portion of the phase diagram at weak coupling. This region of stability is seen
+to grow with increasing values of t'.",9703213v1
+2003-06-16,Gate control of spin dynamics in III-V semiconductor quantum dots,"We show that the g-factor and the spin-flip time T_{1} of a heterojunction
+quantum dot is very sensitive to the band-bending interface electric field even
+in the absence of wave function penetration into the barrier. When this
+electric field is of the order of 10^{5} V/cm, g and T_{1} show high
+sensitivity to dot radius and magnetic field arising from the interplay between
+Rashba and Dresselhaus spin-orbit interactions. This result opens new
+possibilities for the design of a quantum dot spin quantum computer where
+g-factor and T_{1} can be engineered by manipulating the spin-orbit coupling
+through external gates.",0306417v2
+2005-10-15,Coherent single electron spin control in a slanting Zeeman field,"We consider a single electron in a 1D quantum dot with a static slanting
+Zeeman field. By combining the spin and orbital degrees of freedom of the
+electron, an effective quantum two-level (qubit) system is defined. This
+pseudo-spin can be coherently manipulated by the voltage applied to the gate
+electrodes, without the need for an external time-dependent magnetic field or
+spin-orbit coupling. Single qubit rotations and the C-NOT operation can be
+realized. We estimated relaxation ($T_1$) and coherence ($T_{2}$) times, and
+the (tunable) quality factor. This scheme implies important experimental
+advantages for single electron spin control.",0510411v1
+2005-11-18,"Strangeness spin, magnetic moment and strangeness configurations of the proton","The implications of the empirical signatures for the positivity of the
+strangeness magnetic moment $\mu_s$, and the negativity of the strangeness
+contribution to the proton spin $\Delta_s$, on the possible $uuds\bar s$
+configurations of five quarks in the proton are analyzed. The empirical signs
+for the values of these two observables can only be obtained in configurations
+where the $uuds$ system is orbitally excited and the $\bar s$ quark is in the
+ground state. The configurations, in which the $\bar s$ is orbitally excited,
+which include the conventional $K^+\Lambda^0$ congfiguration, with the
+exception of that, in which the $uuds$ component has spin 2, yield negative
+values for $\mu_s$. Here the strangeness spin $\Delta_s$, the strangeness
+magnetic moment $\mu_s$ and the axial coupling constant $G_A^s$ are calculated
+for all possible configurations of the $uuds\bar s$ component of the proton. In
+the configuration with $[4]_{FS}[22]_F[22]_S$ flavor-spin symmetry, which is
+likely to have the lowest energy, $\mu_s$ is positive and $\Delta_s\simeq
+G_A^s\simeq -1/3\mu_s$.",0511223v1
+2008-04-29,Spin-magnetophonon level splitting in semimagnetic quantum wells,"Spin-magnetophonon level splitting in a quantum well made of a semimagnetic
+wide gap semiconductor is considered. The semimagnetic semiconductors are
+characterized by a large effective $g$ factor. The resonance conditions
+$\hbar\omega_{\rm LO}=\mu_BgB$ for the spin flip between two Zeeman levels due
+to interaction with longitudinal optical phonons can be achieved sweeping
+magnetic field $B$. This condition is studied in quantum wells. It is shown
+that it leads to a level splitting that is dependent on the electron-phonon
+coupling strength as well as on the spin-orbit interaction in this structure.
+  We treat in detail the Rashba model for the spin-orbit interaction assuming
+that the quantum well lacks inversion symmetry and briefly discuss other
+models. The resonant transmission and reflection of light by the well is
+suggested as a suitable experimental probe of the level splitting.",0804.4654v1
+2010-02-08,Coulomb-induced Rashba spin-orbit coupling in semiconductor quantum wells,"In the absence of an external field, the Rashba spin-orbit interaction (SOI)
+in a two-dimensional electron gas in a semiconductor quantum well arises
+entirely from the screened electrostatic potential of ionized donors. We adjust
+the wave functions of a quantum well so that electrons occupying the first
+(lowest) subband conserve their spin projection along the growth axis (Sz),
+while the electrons occupying the second subband precess due to Rashba SOI.
+Such a specially designed quantum well may be used as a spin relaxation
+trigger: electrons conserve Sz when the applied voltage (or current) is lower
+than a certain threshold V*; higher voltage switches on the Dyakonov-Perel spin
+relaxation.",1002.1510v2
+2010-04-06,Spin and pseudospin symmetries in the antinucleon spectrum of nuclei,"Spin and pseudospin symmetries in the spectra of nucleons and antinucleons
+are studied in a relativistic mean-field theory with scalar and vector
+Woods-Saxon potentials, in which the strength of the latter is allowed to
+change. We observe that, for nucleons and antinucleons, the spin symmetry is of
+perturbative nature and it is almost an exact symmetry in the physical region
+for antinucleons. The opposite situation is found in the pseudospin symmetry
+case, which is better realized for nucleons than for antinucleons, but is of
+dynamical nature and cannot be viewed in a perturbative way both for nucleons
+and antinucleons. This is shown by computing the spin-orbit and
+pseudospin-orbit couplings for selected spin and pseudospin partners in both
+spectra.",1004.0823v1
+2011-01-13,Spin transport in higher n-acene molecules,"We investigate the spin transport properties of molecules belonging to the
+acenes series by using density functional theory combined with the
+non-equilibrium Green's function approach to electronic transport. While short
+acenes are found to be non-magnetic, molecules comprising more than nine acene
+rings have a spin-polarized ground state. In their gas phase these have a
+singlet total spin configuration, since the two unpaired electrons occupying
+the doubly degenerate highest molecular orbital are antiferromagnetically
+coupled to each other. Such an orbital degeneracy is however lifted once the
+molecule is attached asymmetrically to Au electrodes via thiol linkers, leading
+to a fractional magnetic moment. In this situation the system Au/n-acene/Au can
+act as an efficient spin-filter with interesting applications in the emerging
+field of organic spintronics.",1101.2528v1
+2011-02-17,"Anomalous optical phonons in FeTe pnictides: spin state, magnetic order, and lattice anharmonicity","Polarized Raman-scattering spectra of non-superconducting, single-crystalline
+FeTe are investigated as function of temperature. We have found a relation
+between the magnitude of ordered magnetic moments and the linewidth of A1g
+phonons at low temperatures. This relation is attributed to the intermediate
+spin state (S=1) and the orbital degeneracy of the Fe ions. Spin-phonon
+coupling constants have been estimated based on microscopic modeling using
+density-functional theory and analysis of the local spin density. Our
+observations show the importance of orbital degrees of freedom for the Fe-based
+superconductors with large ordered magnetic moments, while small magnetic
+moment of Fe ions in some iron pnictides reflects the low spin state of Fe ions
+in those systems.",1102.3688v1
+2013-01-16,Quantum simulation of a spin polarization device in an electron microscope,"A proposal for an electron-beam device that can act as an efficient
+spin-polarization filter has been recently put forward [E. Karimi et al., Phys.
+Rev. Lett. 108, 044801 (2012)]. It is based on combining the recently developed
+diffraction technology for imposing orbital angular momentum to the beam with a
+multipolar Wien filter inducing a sort of artificial non-relativistic
+spin-orbit coupling. Here we reconsider the proposed device with a fully
+quantum-mechanical simulation of the electron beam propagation, based on the
+well established multi-slice method, supplemented with a Pauli term for taking
+into account the spin degree of freedom. Using this upgraded numerical tool, we
+study the feasibility and practical limitations of the proposed method for
+spin-polarizing a free electron beam",1301.3938v2
+2013-06-07,The Effective field theory of 2+1 dimensional topological insulator in the presence of Rashba spin-orbit interaction,"2+1 dimensional topological insulator described by the Kane-Mele model in the
+presence of Rashba spin-orbit interaction is considered. The effective action
+of the external fields coupled to electromagnetic and spin degrees of freedom
+is accomplished within this model. The Hamiltonian methods are adopted to
+provide the coefficients appearing in the action. It is demonstrated
+straightforwardly that the coefficients of the Chern-Simons terms are given by
+the first Chern number attained through the related non-Abelian Berry gauge
+field. The effective theory which we obtain is in accord with the existence of
+the spin Hall phase where the value of the spin Hall conductivity is very close
+to the quantized one.",1306.1636v3
+2014-02-14,Spin-Precession: Breaking the Black Hole--Neutron Star Degeneracy,"Mergers of compact stellar remnant are prime targets for the LIGO/Virgo
+gravitational wave detectors. One hopes that the gravitational wave signals
+from these merger events can be used to study the mass and spin distribution of
+stellar remnants, and provide information about black hole horizons and the
+material properties of neutron stars. However, it has been suggested that
+degeneracies in the way that the star's mass and spin are imprinted in the
+waveforms may make it impossible to distinguish between black holes and neutron
+stars. Here we show that the precession of the orbital plane due to spin-orbit
+coupling breaks the mass-spin degeneracy, and allows us to distinguish between
+standard neutron stars and alternative possibilities, such as black holes or
+exotic neutron stars with large masses and spins.",1402.3581v2
+2014-10-30,Relativistic Neel-order fields induced by electrical current in antiferromagnets,"We predict that a lateral electrical current in antiferromagnets can induce
+non-equilibrium N\'eel order fields, i.e. fields whose sign alternates between
+the spin sublattices, which can trigger ultra-fast spin-axis reorientation.
+Based on microscopic transport theory calculations we identify staggered
+current-induced fields analogous to the intra-band and to the intrinsic
+inter-band spin-orbit fields previously reported in ferromagnets with a broken
+inversion-symmetry crystal. To illustrate their rich physics and utility, we
+considered bulk Mn2Au with the two spin sublattices forming inversion partners,
+and a 2D square-lattice antiferromagnet with broken structural inversion
+symmetry modelled by a Rashba spin-orbit coupling. We propose an AFM memory
+device with electrical writing and reading.",1410.8296v1
+2015-03-24,Anomalous Friedel oscillations in a quasi-helical quantum dot,"The charge and spin patterns of a quantum dot embedded into a spin-orbit
+coupled quantum wire subject to a magnetic field are investigated. A Luttinger
+liquid theory is developed, taking into account open boundaries and finite
+magnetic field. In the quasi-helical regime, when spin-orbit effects dominate
+over the Zeeman interaction, peculiar states develop at the Fermi surface of
+the dot. Anomalous Friedel oscillations with twice the expected wavelength
+develop in the wavefunction of collective excitations of such states,
+accompanied by peculiar spin patterns in their magnetization. Both effects are
+analyzed in detail and shown possible to be probed in transport experiments.
+The stability against electron interactions and magnetic field is investigated.
+We also discuss how signatures of such states survive in the total charge and
+spin densities.",1503.06957v1
+2015-10-05,Resonant Spin and Charge Hall Effects in 2D Electron Gas with Unequal Rashba and Dresselhaus Spin-Orbit Couplings under a Perpendicular Magnetic Field,"We have investigated the complex two-dimensional electron system with unequal
+Rashba and Dresselhaus spin-orbit interactions in the presence of a
+perpendicular magnetic field. The spin polarizations are obtained in a wide
+range of magnetic fields. It is shown that such a system is hard to be
+magnetized. We also find that the resonant charge and spin Hall conductances
+occurs simultaneously at a certain magnetic field, at which two (nearly)
+degenerate Landau levels are filled partly. The resonant Hall effects are
+universal in this type of semiconductor materials, and could have potential
+application for semiconductor spintronics.",1510.01012v1
+2016-02-13,Spin transport in n-type single-layer transition metal dichalcogenides,"Valley asymmetry of the electron spectrum in transition metal dichalcogenides
+(TMDs) originates from the spin-orbit coupling. Presence of spin-orbit fields
+of opposite signs for electrons in K and K' valleys in combination with
+possibility of intervalley scattering result in a nontrivial spin dynamics.
+This dynamics is reflected in the dependence of nonlocal resistance on external
+magnetic field (the Hanle curve). We calculate theoretically the Hanle shape in
+TMDs. It appears that, unlike conventional materials without valley asymmetry,
+the Hanle shape in TMDs is different for normal and parallel orientations of
+the external field. For normal orientation, it has two peaks for slow
+intervalley scattering, while, for fast intervalley scattering the shape is
+usual. For parallel orientation, the Hanle curve exhibits a cusp at zero field.
+This cusp is a signature of a slow-decaying valley-asymmetric mode of the spin
+dynamics.",1602.04276v1
+2017-08-15,Coulomb correlations intertwined with spin and orbital excitations in LaCoO$_3$,"We carried out temperature-dependent (20 - 550 K) measurements of resonant
+inelastic X-ray scattering on LaCoO$_3$ to investigate the evolution of its
+electronic structure across the spin-state crossover. In combination with
+charge-transfer multiplet calculations, we accurately quantized the
+renormalized crystal-field excitation energies and spin-state populations. We
+show that the screening of the on-site Coulomb interaction of 3d electrons is
+orbital selective and coupled to the spin-state crossover in LaCoO$_3$. The
+results establish that the gradual spin-state crossover is associated with a
+relative change of Coulomb energy versus bandwidth, leading to a Mott-type
+insulator-to-metal transition.",1708.04417v1
+2018-02-07,Excitonic magnet in external field: complex order parameter and spin currents,"We investigate spin-triplet exciton condensation in the two-orbital Hubbard
+model close to half filling by means of dynamical mean-field theory. Employing
+an impurity solver that handles complex off-diagonal hybridization functions,
+we study the behavior of excitonic condensate in stoichiometric and doped
+systems subject to external magnetic field. We find a general tendency of the
+triplet order parameter to lay perpendicular with the applied field and
+identify exceptions from this rule. For solutions exhibiting k-odd spin
+textures, we discuss the Bloch theorem which, in the absence of spin-orbit
+coupling, forbids the appearance of spontaneous net spin current. We
+demonstrate that the Bloch theorem is not obeyed by the dynamical mean-field
+theory.",1802.02387v1
+2018-11-22,In-gap states of magnetic impurity in quantum spin Hall insulator proximitized to a superconductor,"We study in-gap states of a single magnetic impurity embedded in a honeycomb
+monolayer which is deposited on superconducting substrate. The intrinsic
+spin-orbit coupling induces the quantum spin Hall insulating (QSHI) phase
+gapped around the Fermi energy. Under such circumstances we consider the
+emergence of Shiba-like bound states driven by the superconducting proximity
+effect. We investigate their topography, spin-polarization and signatures of
+the quantum phase transition manifested by reversal of the local currents
+circulating around the magnetic impurity. These phenomena might be important
+for more exotic in-gap quasiparticles in such complex nanostructures as
+magnetic nanowires or islands, where the spin-orbit interaction along with the
+proximity induced electron pairing give rise to topological phases hosting the
+protected boundary modes.",1811.09295v3
+2020-07-30,Silicon quantum dot devices with a self-aligned second gate layer,"We implement silicon quantum dot devices with two layers of gate electrodes
+using a self-alignment technique, which allows for ultra-small gate lengths and
+intrinsically perfect layer-to-layer alignment. In a double quantum dot system,
+we investigate hole transport and observe current rectification due to Pauli
+spin blockade. Magnetic field measurements indicate that hole spin relaxation
+is dominated by spin-orbit interaction, and enable us to determine the
+effective hole $g$-factor $\simeq1.6$. From an avoided singlet-triplet
+crossing, occurring at high magnetic field, the spin-orbit coupling strength
+$\simeq0.27$meV is obtained, promising fast and all-electrical spin control.",2007.15400v1
+2018-05-16,Quantum well structure of a double perovskite superlattice and formation of a spin-polarized two-dimensional electron gas,"Layered oxide heterostructures are the new routes to tailor desired
+electronic and magnetic phases emerging from competing interactions involving
+strong correlation, orbital hopping, tunnelling and lattice coupling phenomena.
+Here, we propose a half-metal/insulator superlattice that intrinsically forms
+spin-polarized two-dimensional electron gas (2DEG) following a mechanism very
+different from the widely reported 2DEG at the single perovskite polar
+interfaces. From DFT$+U$ study on Sr$_2$FeMoO$_6$/La$_2$CoMnO$_6$ (001)
+superlattice, we find that a periodic quantum well is created along [001] which
+breaks the three-fold $t_{2g}$ degeneracy to separate the doubly degenerate
+$xz$ and $yz$ states from the planar $xy$ state. In the spin-down channel, the
+dual effect of quantum confinement and strong correlation localizes the
+degenerate states, whereas the dispersive $xy$ state forms the 2DEG which is
+robust against perturbations to the superlattice symmetry. The spin-up channel
+retains the bulk insulating. Both spin polarization and orbital polarization
+make the superlattice ideal for spintronic and orbitronic applications. The
+suggested 2DEG mechanism widens the scope of fabricating next generation of
+oxide heterostructures.",1805.06128v2
+2017-06-22,Theory of the spin galvanic effect at oxide interfaces,"The spin galvanic effect (SGE) describes the conversion of a non-equilibrium
+spin polarization into a transverse charge current. Recent experiments have
+demonstrated a large conversion efficiency for the two-dimensional electron gas
+formed at the interface between two insulating oxides, LaAlO$_3$ and SrTiO$_3$.
+Here we analyze the SGE for oxide interfaces within a three-band model for the
+Ti t$_{2g}$ orbitals which displays an interesting variety of effective
+spin-orbit couplings in the individual bands that contribute differently to the
+spin-charge conversion. Our analytical approach is supplemented by a numerical
+treatment where we also investigate the influence of disorder and temperature,
+which turns out to be crucial to provide an appropriate description of the
+experimental data.",1706.07243v1
+2019-09-10,Kondo effect in a Aharonov-Casher interferometer,"We consider a model describing a spin field-effect transistor based on a
+quantum nanowire with a tunable spin-orbit interaction embedded between two
+ferromagnetic leads with anticollinear magnetization. We investigate a regime
+of a strong interplay between resonance Kondo scattering and interference
+associated with the Aharonov-Casher effect. Using the Keldysh technique at weak
+coupling regime we calculate perturbatively the charge current. It is predicted
+that the effects of the spin-orbit interaction result in a non-vanishing
+current for any spin polarization of the leads including the case of fully
+polarized anti-collinear contacts. We analyze the influence of the
+Aharonov-Casher phase and degree of spin polarization in the leads onto a Kondo
+temperature.",1909.04524v2
+2019-09-17,Spin-Orbit-Torque Field-Effect Transistor (SOTFET): Proposal for a New Magnetoelectric Memory,"Spin-based memories are attractive for their non-volatility and high
+durability but provide modest resistance changes, whereas semiconductor logic
+transistors are capable of large resistance changes, but lack memory function
+with high durability. The recent availability of multiferroic materials
+provides an opportunity to directly couple the change in spin states of a
+magnetic memory to a charge change in a semiconductor transistor. In this work,
+we propose and analyze the spin-orbit torque field-effect transistor (SOTFET),
+a device with the potential to significantly boost the energy efficiency of
+spin-based memories, and to simultaneously offer a palette of new
+functionalities.",1909.08133v3
+2019-04-15,Spin-Orbit-Torque Driven Propagating Spin Waves,"Spin-orbit torque (SOT) can drive sustained spin wave (SW) auto-oscillations
+in a class of emerging microwave devices known as spin Hall nano-oscillators
+(SHNOs), which have highly non-linear properties governing robust mutual
+synchronization at frequencies directly amenable to high-speed neuromorphic
+computing. However, all demonstrations have relied on localized SW modes
+interacting through dipolar coupling and/or direct exchange. As nanomagnonics
+requires propagating SWs for data transfer, and additional computational
+functionality can be achieved using SW interference, SOT driven propagating SWs
+would be highly advantageous. Here, we demonstrate how perpendicular magnetic
+anisotropy can raise the frequency of SOT driven auto-oscillations in magnetic
+nano-constrictions well above the SW gap, resulting in the efficient generation
+of field and current tunable propagating SWs. Our demonstration greatly extends
+the functionality and design freedom of SHNOs enabling long range SOT driven SW
+propagation for nanomagnonics, SW logic, and neuro-morphic computing, directly
+compatible with CMOS technology.",1904.06945v1
+2016-03-15,"Footprints of hyperfine, spin-orbit, and decoherence effects in Pauli spin blockade","We detect in real time inter-dot tunneling events in a weakly coupled two
+electron double quantum dot in GaAs. At finite magnetic fields, we observe two
+characteristic tunneling times, T_d and T_b, belonging to, respectively, a
+direct and a blocked (spin-flip-assisted) tunneling. The latter corresponds to
+lifting of a Pauli spin blockade and the tunneling times ratio eta=T_b/T_d
+characterizes the blockade efficiency. We find pronounced changes in the
+behavior of eta upon increasing the magnetic field, with eta increasing,
+saturating and increasing again. We explain this behavior as due to the
+crossover of the dominant blockade lifting mechanism from the hyperfine to
+spin-orbit interactions and due to a change in the contribution of the charge
+decoherence.",1603.04861v1
+2017-11-29,Tuning topological surface magnetism by bulk alloying,"Deploying an analytical atomistic model of the bulk band structure of the
+IV-VI semiconductors we connect the spin structure of the topological surface
+state to the crystal field and spin orbit coupling parameters of the bulk
+material. While the Dirac-Weyl (or equivalently, Rashba) type topological
+surface state is often assumed universal, we show that the physics of the
+surface state is strikingly non-universal. To see this explicitly we calculate
+the RKKY interaction, which may be viewed as a probe of this surface state spin
+structure, finding its \emph{qualitative form} depends on the values the bulk
+spin-orbit and crystal field parameters take. This opens the way to tune the
+spin interaction on the surface of a IV-VI topological insulator by, for
+instance varying the composition of the IV-VI ternary compounds, as well as
+highlighting the importance of the connection between bulk and surface physics
+in topological insulators.",1711.10760v1
+2019-05-23,Topological Hall Effect and Emergent Skyrmion Crystal in Manganite-Iridate Oxide Interfaces,"Scalar spin chirality is expected to induce a finite contribution to the Hall
+response at low temperatures. We study this spin-chirality-driven Hall effect,
+known as the topological Hall effect, at the manganite side of the interface
+between La$_{1-x}$Sr$_{x}$MnO$_{3}$ and SrIrO$_3$. The ferromagnetic
+double-exchange hopping at the manganite layer, in conjunction with the
+Dzyaloshinskii-Moriya (DM) interaction which arises at the interface due to
+broken inversion symmetry and strong spin-orbit coupling from the iridate
+layer, could produce a skyrmion-crystal (SkX) phase in the presence of an
+external magnetic field. Using the Monte Carlo technique and a two-orbital
+spin-fermion model for manganites, supplemented by an in-plane DM interaction,
+we obtain phase diagrams which reveal at low temperatures a clear SkX phase and
+also a low-field spin-spiral phase. Increasing temperature, a skyrmion-gas
+phase, precursor of the SkX phase upon cooling, was identified. The topological
+Hall effect primarily appears in the SkX phase, as observed before in oxide
+heterostructures. We conclude that the manganite-iridate superlattices provide
+another useful platform to explore a plethora of unconventional magnetic and
+transport properties.",1905.09887v2
+2021-05-03,Moiré tuning of spin excitations: Individual Fe atoms on MoS$_2$/Au(111),"Magnetic adatoms on surfaces are exchange coupled to their environment,
+inducing fast relaxation of excited spin states and decoherence. These
+interactions can be suppressed by inserting decoupling layers between the
+magnetic adsorbate and the metallic substrate. Using low-temperature scanning
+tunneling microscopy and spectroscopy, we investigate the magnetic properties
+of single Fe atoms on Au(111) covered by a monolayer of MoS$_2$ and explore the
+influence of the moir\'e structure on the spin excitation spectra. Fe adatoms
+absorbed at minima of the moir\'e structure exhibit almost pure inelastic spin
+excitations. Kondo correlations develop for adsorption sites off the moir\'e
+minimum, culminating in fully developed Kondo resonances on moir\'e maxima. The
+increase in Kondo correlations is accompanied by a decrease in the single-ion
+anisotropy, which we rationalize by poor-person's scaling. Local variations in
+the tunneling spectra indicate pronounced interference between tunneling paths
+involving the spin-carrying orbitals and a hybrid Fe-S orbital, which forms
+despite the nominally inert nature of the terminating S layer.",2105.01176v1
+2021-07-21,Spin orbit torque switching of antiferromagnet through the Neel reorientation in rare-earth ferrite,"We suggest coherent switching of canted antiferromagnetic (AFM) spins using
+spin-orbit torque (SOT) in small magnet. The magnetic system of orthoferrite
+features biaxial easy anisotropy and the Dzyaloshinskii Moriya interaction,
+which is perpendicular to the easy axes and therefore creates weak
+magnetization (m). A damping-like component of the SOT induces N\'eel
+reorientation along one of the easy axes and then exerts torque on m, leading
+to tilting of the N\'eel order l. The torque on the magnetization becomes
+stronger due to coupling with the induced Oersted field or the field-like
+component of the SOT, enhancing the tilting of l. Therefore, l is found to
+experience deterministic switching after the SOT is turned off. Based upon both
+numerical and analytical analysis of the coherent switching, XOR logic gates
+are also found to be implemented in a single magnetic layer. In addition, we
+investigate how magnetic parameters affect the critical reorientation angle and
+current density in a simple layered structure of platinum and a canted AFM. Our
+findings are expected to provide an alternative spin-switching mechanism for
+ultrafast applications such as spin logic and electronic devices.",2107.10156v1
+2021-10-27,Low-energy effective theory and anomalous Hall effect in monolayer $\mathrm{WTe}_2$,"We develop a symmetry-based low-energy theory for monolayer $\mathrm{WTe}_2$
+in its 1T$^{\prime}$ phase, which includes eight bands (four orbitals, two
+spins). This model reduces to the conventional four-band spin-degenerate Dirac
+model near the Dirac points of the material. We show that measurements of the
+spin susceptibility, and of the magnitude and time dependence of the anomalous
+Hall conductivity induced by injected or equilibrium spin polarization can be
+used to determine the magnitude and form of the spin-orbit coupling
+Hamiltonian, as well as the dimensionless tilt of the Dirac bands.",2110.14586v3
+2023-04-25,The higher-order magnetic skyrmions in non-uniform magnetic fields,"For 2D Hubbard model with spin-orbit Rashba coupling in external magnetic
+field the structure of effective spin interactions is studied in the regime of
+strong electron correlations and at half-filling. It is shown that in the third
+order of perturbation theory, the scalar and vector chiral spin-spin
+interactions of the same order arise. The emergence of the latter is due to
+orbital effects of magnetic field. It is shown that for nonuniform fields,
+scalar chiral interaction can lead to stabilization of axially symmetric
+skyrmion states with arbitrary topological charges. Taking into account the
+hierarchy of effective spin interactions, an analytical theory on the optimal
+sizes of such states -- the higher-order magnetic skyrmions -- is developed for
+axially symmetric magnetic fields of the form $h(r) \sim r^{\beta}$ with $\beta
+\in \mathbb{R}$.",2304.12694v1
+2023-05-15,Magnetoresistive RAM with n-doped AlGaAs/GaAs writing/reading channels,"We show that the tunable gate voltage in n-doped AlGaAs/GaAs QW (quantum
+well) is a key in designing an efficient and ultrafast MRAM (magnetoresistive
+random access memory). The Rashba spin-orbit coupling in such QWs can be tuned
+appropriately by the gate voltage to create an intense spin-Hall field which in
+turns interacts with the ferromagnetic layer of the MRAM through the mechanism
+of spin orbit torque. The strong spin-Hall field leads to an infinitesimally
+small switching time of the MRAM. Our proposed MRAM is thus a better
+alternative to the conventional ferromagnetic/spin-Hall effect bi-layers MRAM
+for the reason that the switching time can be varied with ease, which is
+unfeasible in the later. Concisely, not only that this work signals a
+possibility to design an ultra-fast MRAM, but it also suggests a model to
+fabricate a tunable switching time MRAM.",2305.08565v1
+2023-12-25,Planar Hall effect from superconducting fluctuations,"We study the planar Hall effect (PHE), and reexamine the Lifshitz invariants
+in the spin-orbit coupled superconductors. In the Rashba superconductor, the
+PHE is finite as fluctuations are faster along the applied field than
+perpendicular to it. We consider spin-orbit splitting that is larger than the
+critical temperature. In this regime the Cooper pairs are predominantly
+intra-band. The effective two-band interaction matrix elements are not
+sensitive enough to the field to affect the PHE. However, in a wide range of
+parameters this dependence does modify the Lifshitz invariant, linear in field
+and responsible for the spin diode effect. This contribution is a geometrical
+effect of the adjustment of the spin texture to the applied field. As such, it
+also allows the repulsion or attraction in the spin triplet channel to affect
+the Lifshitz invariant. While the PHE can be studied within the effective
+two-band superconductor model with an original pairing interaction, the
+Lifshitz invariant, in general, cannot. Disorder is shown to only moderately
+suppress the PHE.",2312.15688v1
+2024-03-01,Decoherence in Andreev spin qubits,"We theoretically study the dephasing of an Andreev spin qubit (ASQ) due to
+electric and magnetic noise. Using a tight-binding model, we calculate the
+Andreev states formed in a Josephson junction where the link is a semiconductor
+with strong spin-orbit interaction. As a result of both the spin-orbit
+interaction and induced superconductivity, the local charge and spin of these
+states varies as a function of externally controllable parameters: the phase
+difference between the superconducting leads, an applied magnetic field, and
+filling of the underlying semiconductor. Concomitantly, coupling to
+fluctuations of the electric or magnetic environment will vary, which informs
+the rate of dephasing. We qualitatively predict the dependence of dephasing on
+the nature of the environment, magnetic field, phase difference between the
+junction, and filling of the semiconductor. Comparing the simulated electric-
+and magnetic-noise-induced dephasing rate to experiment suggests that the
+dominant source of noise is magnetic. Moreover, by appropriately tuning these
+external parameters, we find sweet-spots at which we predict an enhancement in
+ASQ coherence times.",2403.00710v1
+2016-04-22,Coherent Coupling of WS_2 Monolayers with Metallic Photonic Nanostructures at Room Temperature,"Room temperature strong coupling of WS_2 monolayer exciton transitions to
+metallic Fabry-Perot and plasmonic optical cavities is demonstrated. A Rabi
+splitting of 101 meV is observed for the Fabry-Perot cavity, more than double
+those reported to date in other 2D materials. The enhanced magnitude and
+visibility of WS_2 monolayer strong coupling is attributed to the larger
+absorption coefficient, the narrower linewidth of the A exciton transition, and
+greater spin-orbit coupling. For WS_2 coupled to plasmonic arrays, the Rabi
+splitting still reaches 60 meV despite the less favorable coupling conditions,
+and displays interesting photoluminescence features. The unambiguous signature
+of WS_2 monolayer strong coupling in easily fabricated metallic resonators at
+room temperature suggests many possibilities for combining light-matter
+hybridization with spin and valleytronics.",1604.06656v1
+2006-01-17,Spin Hot Spots in vertically-coupled Few-electron Quantum Dots,"The effects of spin-orbit (SO) coupling arising from the confinement
+potential in single and two vertically-coupled quantum dots have been
+investigated. Our work indicates that a dot containing a single electron shows
+the lifting of the degeneracy of dipole-allowed transitions at B=0 due to the
+SO coupling which disappears for a dot containing two electrons. For coupled
+dots with one electron in each dot, the optical spectra is not affected by the
+coupling and is the same as the dot containing one electron. However, for the
+case of two coupled dots where one partner dot has two interacting electrons
+while the other dot has only one electron, a remarkable effect is observed
+where the oscillator strength of two out of four dipole-allowed transition
+lines disappears as the distance between the dots is decreased.",0601390v1
+2014-08-10,Localized modes in quasi-2D Bose-Einstein condensates with spin-orbit and Rabi couplings,"We consider a two-component pancake-shaped, i.e., effectively two-dimensional
+(2D), Bose-Einstein condensate (BEC) coupled by the spin-orbit (SO) and Rabi
+terms. The SO coupling adopted here is of the mixed Rashba-Dresselhaus type.
+For this configuration, we derive a system of two 2D nonpolynomial
+Schr\""odinger equations (NPSEs), for both attractive and repulsive interatomic
+interactions. In the low- and high-density limits, the system amounts to
+previously known models, namely, the usual 2D Gross-Pitaevskii equation, or the
+Schr\""odinger equation with the nonlinearity of power 7/3. We present simple
+approximate localized solutions, obtained by treating the SO and Rabi terms as
+perturbations. Localized solutions of the full NPSE system are obtained in a
+numerical form. Remarkably, in the case of the attractive nonlinearity acting
+in free space (i.e., without any 2D trapping potential), we find parameter
+regions where the SO and Rabi couplings make 2D fundamental solitons
+dynamically stable.",1408.2256v2
+2015-01-20,Quantum Anomalous Hall Effect in Graphene Proximity Coupled to an Antiferromagnetic Insulator,"We propose realizing the quantum anomalous Hall effect by proximity coupling
+graphene to an antiferromagnetic insulator that provides both broken
+time-reversal symmetry and spin-orbit coupling. We illustrate our idea by
+performing ab initio calculations for graphene adsorbed on the (111) surface of
+BiFeO3. In this case, we find that the proximity-induced exchange field in
+graphene is about 70 meV, and that a topologically nontrivial band gap is
+opened by Rashba spin-orbit coupling. The size of the gap depends on the
+separation between the graphene and the thin film substrate, which can be tuned
+experimentally by applying external pressure.",1501.04828v1
+2015-01-26,Composite localized modes in discretized spin-orbit-coupled Bose-Einstein condensates,"We introduce a discrete model for binary spin-orbit-coupled (SOC)
+Bose-Einstein condensates (BEC) trapped in a deep one-dimensional optical
+lattice. Two different types of the couplings are considered, with spatial
+derivatives acting inside each species, or between the species. The discrete
+system with inter-site couplings dominated by the SOC, while the usual hopping
+is negligible, \textit{emulates} condensates composed of extremely heavy atoms,
+as well as those with opposite signs of the effective atomic masses in the two
+components.\ Stable localized composite states of miscible and immiscible types
+are constructed. The effect of the SOC on the immiscibility-miscibility
+transition in the localized complexes, which emulates the phase transition
+between insulating and conducting states in semiconductors, is studied.",1501.06386v1
+2015-05-08,Enhanced stripe phases in spin-orbit-coupled Bose-Einstein condensates in ring cavities,"The coupled dynamics of the atom and photon fields in optical ring cavities
+with two counter-propagating modes give rise to both spin-orbit interactions as
+well as long-ranged interactions between atoms of a many-body system. At zero
+temperature, the interplay between the two-body and cavity-mediated
+interactions determines the ground state of a Bose-Einstein condensate. In this
+work, we find that cavity quantum electrodynamics in the weak-coupling regime
+favors a stripe-phase state over a plane-wave phase as the strength of
+cavity-mediated interactions increases. Indeed, the stripe phase is
+energetically stabilized even for condensates with attractive intra- and
+inter-species interactions for sufficiently large cavity interactions. The
+elementary excitation spectra in both phases correspond to linear dispersion
+relation at long wavelengths, indicating that both phases exhibit
+superfluidity, though the plane-wave phase also displays a characteristic
+roton-type feature. The results suggest that even in the weak coupling regime
+cavities can yield interesting new physics in ultracold quantum gases.",1505.02189v1
+2018-02-04,Magnetotransport in Layered Dirac Fermion System Coupled with Magnetic Moments,"We theoretically investigate the magnetotransport of Dirac fermions coupled
+with localized moments to understand the physical properties of the Dirac
+material EuMnBi$_2$. Using an interlayer hopping form, which simplifies the
+complicated interaction between the layers of Dirac fermions and the layers of
+magnetic moments in EuMnBi$_2$, the theory reproduces most of the features
+observed in this system. The hysteresis observed in EuMnBi$_2$ can be caused by
+the valley splitting that is induced by the spin-orbit coupling and the
+external magnetic field with the molecular field created by localized moments.
+Our theory suggests that the magnetotransport in EuMnBi$_2$ is due to the
+interplay among Dirac fermions, localized moments, and spin-orbit coupling.",1802.01060v1
+2012-01-11,Searching for Majorana Fermions in 2D Spin-orbit Coupled Fermi Superfluids at Finite Temperature,"Recent experimental breakthrough in realizing spin-orbit (SO) coupling for
+cold atoms has spurred considerable interest in the physics of 2D SO coupled
+Fermi superfluids, especially topological Majorana fermions (MFs) which were
+predicted to exist at zero temperature. However, it is well known that
+long-range superfluid order is destroyed in 2D by the phase fluctuation at
+finite temperature and the relevant physics is the
+Berezinskii-Kosterlitz-Thouless (BKT) transition. In this Letter, we examine
+finite temperature effects on SO coupled Fermi gases and show that finite
+temperature is indeed necessary for the observation of MFs. MFs are
+topologically protected by a quasiparticle energy gap which is found to be much
+larger than the temperature. The restrictions to the parameter region for the
+observation of MFs have been obtained.",1201.2238v3
+2016-08-16,Vortex solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates: effects of the Rashba-Dresselhaus coupling and the Zeeman splitting,"We present an analysis of two-dimensional (2D) matter-wave solitons, governed
+by the pseudo-spinor system of Gross-Pitaevskii equations with self- and
+cross-attraction, which includes the spin-orbit coupling (SOC) in the general
+Rashba-Dresselhaus form, and, separately, the Rashba coupling and the Zeeman
+splitting. Families of semi-vortex (SV) and mixed-mode (MM) solitons are
+constructed, which exist and are stable in free space, as the SOC terms prevent
+the onset of the critical collapse and create the otherwise missing ground
+states in the form of the solitons. The Dresselhaus SOC produces a destructive
+effect on the vortex solitons, while the Zeeman term tends to convert the MM
+states into the SV ones, which eventually suffer delocalization. Existence
+domains and stability boundaries are identified for the soliton families. For
+physically relevant parameters of the SOC system, the number of atoms in the 2D
+solitons is limited by $\sim 1.5\times 10^{4}$. The results are obtained by
+means of combined analytical and numerical methods.",1608.04564v1
+2017-10-09,Traveling dark-bright solitons in a reduced spin-orbit coupled system: application to Bose-Einstein condensates,"In the present work, we explore the potential of spin-orbit (SO) coupled
+Bose-Einstein condensates to support multi-component solitonic states in the
+form of dark-bright (DB) solitons. In the case where Raman linear coupling
+between components is absent, we use a multiscale expansion method to reduce
+the model to the integrable Mel'nikov system. The soliton solutions of the
+latter allow us to reconstruct approximate traveling DB solitons for the
+reduced SO coupled system. For small values of the formal perturbation
+parameter, the resulting waveforms propagate undistorted, while for large
+values thereof, they shed some dispersive radiation, and subsequently distill
+into a robust propagating structure. After quantifying the relevant radiation
+effect, we also study the dynamics of DB solitons in a parabolic trap,
+exploring how their oscillation frequency varies as a function of the bright
+component mass and the Raman laser wavenumber.",1710.03270v1
+2020-05-23,Modulational instability in binary spin-orbit-coupled Bose-Einstein condensates,"We study modulation instability (MI) of flat states in two-component
+spin-orbit-coupled (SOC) Bose-Einstein condensates (BECs) in the framework of
+coupled Gross-Pitaevskii equations for two components of the pseudospinor wave
+function. The analysis is performed for equal densities of the components.
+Effects of the interaction parameters, Rabi coupling, and SOC on the MI are
+investigated. In particular, the results demonstrate that the SOC strongly
+alters the commonly known MI (immiscibility) condition, $g_{12} > g_{1} g_{2}$,
+for the binary superfluid with coefficients $g_{1,2}$ and $g_{12}$ of the
+intra- and interspecies repulsive interactions. In fact, the binary BEC is
+always subject to the MI under the action of the SOC, which implies that the
+ground state of the system is plausibly represented by a striped phase.",2005.11505v1
+2020-11-17,FORTRESS II: FORTRAN programs for solving coupled Gross-Pitaevskii equations for spin-orbit coupled spin-2 Bose-Einstein condensate,"We provide here a set of three OpenMP parallelized FORTRAN 90/95 programs to
+compute the ground states and the dynamics of trapped spin-2 Bose-Einstein
+condensates (BECs) with anisotropic spin-orbit (SO) coupling by solving a set
+of five coupled Gross-Pitaevskii equations using a time-splitting Fourier
+spectral method. Depending on the nature of the problem, without any loss of
+generality, we have employed the Cartesian grid spanning either three-, two-,
+or one-dimensional space for numerical discretization. To illustrate the
+veracity of the package, wherever feasible, we have compared the numerical
+ground state solutions of the full mean-field model with those from the
+simplified scalar models. The two set of results show excellent agreement, in
+particular, through the equilibrium density profiles, energies and chemical
+potentials of the ground-states. We have also presented test results for OpenMP
+performance parameters like speedup and the efficiency of the three codes.",2011.08892v1
+2022-01-31,Fermi surface segmentation in the helical state of a Rashba superconductor,"We investigate the quasiparticle excitations in the FFLO- type helical state
+of a superconductor with inversion-symmetry breaking and strong Rashba
+spin-orbit coupling. We restrict to a state with single finite momentum of
+Cooper pairs in the helical phase that is determined by minimization of the
+condensation energy. We derive the dependence of quasiparticle dispersions on
+the Rashba coupling strength and external field. It leads to a peculiar
+momentum-space segmentation of the corresponding Rashba Fermi surface sheets
+which has not yet been observed experimentally. We show that it may be directly
+visualized by the method of quasiparticle interference that identifies the
+critical points of the segmented sheets and can map their evolution with field
+strength, bias voltage and Rashba coupling. We also indicate a strategy how to
+determine the finite Cooper-pair momentum from experimental quantities. This
+investigation has the potential for a more detailed microscopic understanding
+of the helical superconducting state under the influence of Rashba spin-orbit
+coupling.",2201.13213v1
+2024-02-28,Stabilizing topological superconductivity in disordered spin-orbit coupled semiconductor-superconductor heterostructures,"We investigate theoretically a one-dimensional semiconductor-superconductor
+(SM-SC) heterostructure with Rashba spin-orbit coupling and parallel Zeeman
+field in the presence of disorder generated by random charged impurities and
+identify the optimal regimes for realizing topological superconductivity and
+Majorana zero modes. Using a Green's function approach, we show that upon
+increasing the disorder strength the stable topological superconducting phase
+characterized by robust end-to-end Majorana correlations ""migrates"" toward
+larger values of the Zeeman field and can be stabilized by increasing the
+effective SM-SC coupling. Based on these findings, we propose a strategy for
+accessing a regime characterized by well-separated Majorana zero modes that is
+based on (a) enhancing the strength of the effective SM-SC coupling (e.g.,
+through interface engineering) and (b) expanding the range of accessible Zeeman
+fields (e.g., by enhancing the gyromagnetic ratio or optimizing the parent
+superconductor, to enable the application of larger magnetic fields). While
+this strategy may still require some reduction of the disorder strength, this
+requirement is significantly less strict than the corresponding requirement in
+a strategy that focuses exclusively on disorder reduction.",2402.18549v2
+2024-03-04,Signature of reentrant localization in collisional inhomogeneous spin-orbit coupled condensates,"We study the localization transition in a spin-orbit (SO) coupled binary
+Bose-Einstein condensates (BECs) with collisional inhomogeneous interaction
+trapped in a one-dimensional quasiperiodic potential. Our numerical analysis
+shows that the competition between the quasiperiodic disorder and inhomogeneous
+interaction leads to a reentrant localization transition as the interaction
+strength is tuned from attractive to repulsive in nature. Further, we analyse
+the combined effect of the SO and Rabi coupling strengths on the localization
+transition for different interaction strengths and obtain signatures of
+reentrant localization transition as function of SO coupling in the regime of
+weak interactions. We complement our numerical observation with the analytical
+model using the variational approach. At the end we show how the reentrant
+localization is manifested in the quench dynamics of the condensate. Our study
+provides an indirect approach to achieve localization transition without tuning
+the quasiperiodic potential strength, rather by tuning the inhomogeneous
+interaction.",2403.02027v2
+1996-05-23,Persistent Current From the Competition Between Zeeman Coupling and Spin-Orbit Interaction,"Applying the non-adiabatic Aharonov-Anandan phase approach to a mesoscopic
+ring with non-interacting many electrons in the presence of the spin-orbit
+interaction, Zeeman coupling and magnetic flux, we show that the time-reversal
+symmetry breaking due to Zeeman coupling is intrinsically different from that
+due to magnetic flux. We find that the direction of the persistent currents
+induced by the Zeeman coupling changes periodically with the particle number,
+while the magnetic flux determines the direction of the induced currents by its
+sign alone.",9605144v2
+2014-07-03,Equation of state and phase transition in spin-orbit-coupled Bose gases at finite temperature: A perturbation approach,"We study two-component Bose gases with Raman induced spin-orbit coupling via
+a perturbation approach at finite temperature. For weak coupling, free energy
+is expanded in terms of Raman coupling strength up to the second order, where
+the coefficient (referred to as Raman susceptibility) is determined according
+to linear response theory. The equation of state for the stripe phase and the
+plane-wave phase are obtained in Popov approximation, and the first order
+transition between these two phases is investigated. As temperature increases,
+we find the phase boundary bends toward the stripe phase side in most
+temperature regions, which implies the ferromagnetic order is more robust than
+the crystalline order in presence of thermal fluctuations. Our results
+qualitatively agree with the recent experimental observation in rubidium atomic
+gases. A method to measure the Raman susceptibility through the two-photon
+Bragg scattering experiment is also discussed.",1407.0990v2
+2014-08-08,Softening of Roton and Phonon Modes in a Bose-Einstein Condensate with Spin-Orbit Coupling,"Roton-type excitations usually emerge from strong correlations or long-range
+interactions, as in superfluid helium or dipolar ultracold atoms. However, in
+weakly short-range interacting quantum gas, the recently synthesized spin-orbit
+(SO) coupling can lead to various unconventional phases of superfluidity, and
+give rise to an excitation spectrum of roton-maxon character. Using Bragg
+spectroscopy we study a SO coupled Bose-Einstein condensate of $^{87}$Rb atoms,
+and show that the excitation spectrum in a ""magnetized"" phase clearly possesses
+a two-branch and roton-maxon structure. As Raman coupling strength $\Omega$ is
+decreased, a roton-mode softening is observed, as a precursor of the phase
+transition to a stripe phase that spontaneously breaks spatially translational
+symmetry. The measured roton gaps agree well with theoretical calculations.
+Further, we determine sound velocities both in the magnetized and the
+non-magnetized phase, and a phonon-mode softening is observed around the phase
+transition in between. The validity of the $f$-sum rule is examined.",1408.1755v1
+2014-12-02,Dynamical generation of dark solitons in spin-orbit-coupled Bose-Einstein condensates,"We numerically investigate the ground state, the Raman-driving dynamics and
+the nonlinear excitations of a realized spin-orbit-coupled Bose-Einstein
+condensate in a one-dimensional harmonic trap. Depending on the Raman coupling
+and the interatomic interactions, three ground-state phases are identified:
+stripe, plane wave and zero-momentum phases. A narrow parameter regime with
+coexistence of stripe and zero-momentum or plane wave phases in real space is
+found. Several sweep progresses across different phases by driving the Raman
+coupling linearly in time is simulated and the non-equilibrium dynamics of the
+system in these sweeps are studied. We find kinds of nonlinear excitations,
+with the particular dark solitons excited in the sweep from the stripe phase to
+the plane wave or zero-momentum phase within the trap. Moreover, the number and
+the stability of the dark solitons can be controlled in the driving, which
+provide a direct and easy way to generate dark solitons and study their
+dynamics and interaction properties.",1412.0800v2
+2014-12-11,Biquadratic and ring exchange interactions in orthorhombic perovskite manganites,"We use ab initio electronic structure calculations within the generalized
+gradient approximation (GGA+U) to density functional theory (DFT) to determine
+the microscopic exchange interactions in the series of orthorhombic rare-earth
+manganites, o-$R$MnO$_3$. Our motivation is to construct a model Hamiltonian
+(excluding effects due to spin-orbit coupling), which can provide an accurate
+description of the magnetism in these materials. First, we consider TbMnO$_3$,
+which exhibits a spiral magnetic order at low temperatures. We map the exchange
+couplings in this compound onto a Heisenberg Hamiltonian and observe a clear
+deviation from the Heisenberg-like behavior. We consider first the coupling
+between magnetic and orbital degrees of freedom as a potential source of
+non-Heisenberg behavior in TbMnO$_3$, but conclude that it does not explain the
+observed deviation. We find that higher order magnetic interactions
+(biquadratic and four-spin ring couplings) should be taken into account for a
+proper treatment of the magnetism in TbMnO$_3$ as well as in the other
+representatives of the o-$R$MnO$_3$ series with small radii of the $R$ cation.",1412.3702v1
+2015-10-19,Spin-orbit coupling enhanced superconductivity in Bi-rich compounds ABi$_{3}$ (A=Sr and Ba),"Recently, Bi-based compounds have attracted attentions because of the strong
+spin-orbit coupling (SOC). In this work, we figured out the role of SOC in
+ABi$_{3}$ (A=Sr and Ba) by theoretical investigation of the band structures,
+phonon properties, and electron-phonon coupling. Without SOC, strong Fermi
+surface nesting leads to phonon instabilities in ABi$_{3}$. SOC suppresses the
+nesting and stabilizes the structure. Moreover, without SOC the calculation
+largely underestimates the superconducting transition temperatures ($T_{c}$),
+while with SOC the calculated $T_{c}$ are very close to those determined by
+measurements on single crystal samples. The SOC enhanced superconductivity in
+ABi$_{3}$ is due to not only the SOC induced phonon softening, but also the SOC
+related increase of electron-phonon coupling matrix elements. ABi$_{3}$ can be
+potential platforms to construct heterostructure of superconductor/topological
+insulator to realize topological superconductivity.",1510.05719v1
+2016-06-28,Periodic driving control of Raman-induced spin-orbit coupling in Bose-Einstein condensates: the heating mechanisms,"We focus on a technique recently implemented for controlling the magnitude of
+synthetic spin-orbit coupling (SOC) in ultra-cold atoms in the Raman-coupling
+scenario. This technique uses a periodic modulation of the Raman-coupling
+amplitude to tune the SOC. Specifically, it has been shown that the effect of a
+high-frequency sinusoidal modulation of the Raman-laser intensity can be
+incorporated into the undriven Hamiltonian via effective parameters, whose
+adiabatic variation can then be used to steer the SOC. Here, we characterize
+the heating mechanisms that can be relevant to this method. We identify the
+main mechanism responsible for the heating observed in the experiments as
+basically rooted in driving-induced transfer of population to excited states.
+Characteristics of that process determined by the harmonic trapping, the decay
+of the excited states, and the technique used for preparing the system are
+discussed. Additional heating, rooted in departures from adiabaticity in the
+variation of the effective parameters, is also described. Our analytical study
+provides some clues that may be useful in the design of strategies for curbing
+the effects of heating on the efficiency of the control methods.",1606.08800v1
+2017-09-20,Solitons in Bose-Einstein Condensates with Helicoidal Spin-Orbit Coupling,"We report on the existence and stability of freely moving solitons in a
+spatially inhomogeneous Bose- Einstein condensate with helicoidal spin-orbit
+(SO) coupling. In spite of the periodically varying parameters, the system
+allows for the existence of stable propagating solitons. Such states are found
+in the rotating frame, where the helicoidal SO coupling is reduced to a
+homogeneous one. In the absence of the Zeeman splitting, the coupled
+Gross-Pitaevskii equations describing localized states feature many properties
+of the integrable systems. In particular, four-parametric families of solitons
+can be obtained in the exact form. Such solitons interact elastically. Zeeman
+splitting still allows for the existence of two families of moving solitons,
+but makes collisions of solitons inelastic.",1709.07017v1
+2018-06-13,Two-dimensional composite solitons in Bose-Einstein condensates with spatially confined spin-orbit coupling,"It was recently found that the spin-orbit (SO) coupling can help to create
+stable matter-wave solitons in spinor Bose-Einstein condensates in the
+two-dimensional (2D) free space. Being induced by external laser illumination,
+the effective SO coupling can be applied too in a spatially confined area.
+Using numerical methods and the variational approximation (VA), we build
+families of 2D solitons of the semi-vortex (SV) and mixed-mode (MM) types, and
+explore their stability, assuming that the SO-coupling strength is confined in
+the radial direction as a Gaussian. The most essential result is
+identification, by means of the VA and numerical methods, of the minimum size
+of the spatial confinement for which the 2D system maintains stable solitons of
+the SV and MM types.",1806.04868v4
+2021-11-01,LaIr3Ga2: A Superconductor based on a Kagome Lattice of Ir,"New materials based on Kagome lattices, predicted to host exotic quantum
+physics because they can display flat electronic bands, Dirac cones and
+topologically nontrivial surface states, are strongly desired. Here we report
+the crystal structure and superconducting properties of LaIr3Ga2, a previously
+unreported material that is based on a Kagome lattice of the heavy atom Ir.
+LaIr3Ga2 is a type II superconductor with Tc ~ 5.2 K, mu0Hc1 (0) ~ 7.1 mT and
+mu0Hc2 (0) ~ 4.7 T. The normalized heat capacity jump at the superconducting
+transition, (deltaC/gammaTc), 1.41, is within error of the value expected for a
+weak coupling BCS superconductor (1.43). Strong electron-electron correlation
+is inferred from the superconducting coherence length. Calculations show that
+the influence of spin orbit coupling on the electronic structure is
+significant, that the 5d states of the Ir in the Kagome planes are dominant
+near the Fermi energy (EF), that a nearly flat band is calculated to occur at
+about 100 meV below EF, and that two Dirac points are close to EF. This
+material is of interest for investigating the coupling between topological
+physics and superconductivity in a system with significant spin orbit coupling.",2111.01247v2
+2021-06-22,"XY magnetism, Kitaev exchange, and long-range frustration in the $J_{\rm eff}=1/2$ honeycomb cobaltates","The quest for Kitaev quantum spin liquids has led to great interest in
+honeycomb quantum magnets with strong spin-orbit coupling. It has been recently
+proposed that even Mott insulators with $3d$ transition metal ions, having
+nominally weak spin-orbit coupling, can realize such exotic physics. Motivated
+by this, we study the rhombohedral honeycomb cobaltates CoTiO$_3$,
+BaCo$_2$(PO$_4$)$_2$, and BaCo$_2$(AsO$_4$)$_2$, using $\textit{ab initio}$
+density functional theory, which takes into account realistic crystal field
+distortions and chemical information, in conjunction with exact diagonalization
+numerics. We show that these Co$^{2+}$ magnets host $j_\text{eff}=1/2$ local
+moments with highly anisotropic $g$-factors, and we extract their full spin
+Hamiltonians including longer-range and anisotropic exchange couplings. For
+CoTiO$_3$, we find a nearest-neighbor easy-plane ferromagnetic $XXZ$ model with
+additional bond-dependent anisotropies and interlayer exchange, which supports
+three-dimensional (3D) Dirac nodal line magnons. In contrast, for
+BaCo$_2$(PO$_4$)$_2$ and BaCo$_2$(AsO$_4$)$_2$, we find a strongly suppressed
+interlayer coupling, and significant frustration from additional third-neighbor
+antiferromagnetic exchange mediated by P/As. Such bond-anisotropic $J_1$-$J_3$
+spin models can support collinear zig-zag or coplanar spiral ground states; we
+discuss their dynamical spin correlations which reveal a gapped Goldstone mode,
+and argue that the effective parameters of these pseudospin-$1/2$ models may be
+strongly renormalized by coupling to a low energy spin-exciton. Our results
+call for re-examining proposals for realizing Kitaev spin liquids in the
+honeycomb cobaltates.",2106.11982v3
+2013-05-06,Nonlinear modes in binary bosonic condensates with the pseudo-spin-orbital coupling,"We consider a binary Bose-Einstein condensate (BEC) with nonlinear repulsive
+interactions and linear spin-orbit (SO) and Zeeman-splitting couplings. In the
+presence of the trapping harmonic-oscillator (HO) potential, we report the
+existence of even, odd, and asymmetric spatial modes. They feature alternating
+domains with opposite directions of the pseudo-spin, i.e., anti-ferromagnetic
+structures, which is explained by the interplay of the linear couplings, HO
+confinement, and repulsive self-interaction. The number of the domains is
+determined by the strength of the SO coupling. The modes are constructed
+analytically in the weakly nonlinear system. The dynamical stability of the
+modes is investigated by means of the Bogoliubov-de Gennes equations and direct
+simulations. A notable result is that the multi-domain-wall (DW) structures are
+stable, alternating between odd and even shapes, while the simplest single-DW
+structure is unstable. Thus, the system features a transition to the complex
+ground states under the action of the SO coupling. The addition of the Zeeman
+splitting transforms the odd modes into asymmetric ones via spontaneous
+symmetry breaking. The results suggest possibilities for switching the binary
+system between states with opposite (pseudo) magnetization by external fields,
+and realization of similar stable states and dynamical effects in solid-state
+and nonlinear-optical settings emulated by the SO-coupled BECs.",1305.1147v3
+2014-10-27,Spin-orbit interaction in GaAs wells: From one to two subbands,"We investigate the Rashba and Dresselhaus spin-orbit (SO) couplings in GaAs
+quantum wells in the range of well widths $w$ allowing for a transition of the
+electron occupancy from one to two subbands. By performing a detailed
+Poisson-Schr\""odinger self-consistent calculation, we determine all the intra-
+and inter-subband Rashba ($\alpha_1$, $\alpha_2$, $\eta$) and Dresselhaus
+($\beta_1$, $\beta_2$, $\Gamma$) coupling strengths. For relatively narrow
+wells with only one subband occupied, our results are consistent with the data
+of Koralek \emph{et al.} [Nature \bfs{48}, 610 (2009)], i.e., the Rashba
+coupling $\alpha_1$ is essentially independent of $w$ in contrast to the
+decreasing linear Dresselhaus coefficient $\beta_1$. When we widen the well so
+that the second subband can also be populated, we observe that $\alpha_2$
+decreases and $\alpha_1$ increases, both almost linearly with $w$.
+Interestingly, we find that in the parameter range studied (i.e., very
+asymmetric wells) $\alpha_2$ can attain zero and change its sign, while
+$\alpha_1$ is always positive. In this double-occupancy regime of $w$'s,
+$\beta_1$ is mostly constant and $\beta_2$ decreases with $w$ (similarly to
+$\beta_1$ for the single-occupancy regime). On the other hand, the intersubband
+Rashba coupling strength $\eta$ decreases with $w$ while the intersubband
+Dresselhaus $\Gamma$ remains almost constant. We also determine the
+persistent-spin-helix symmetry points, at which the Rashba and the renormalized
+(due to cubic corrections) linear Dresselhaus couplings in each subband are
+equal, as a function of the well width and doping asymmetry. Our results should
+stimulate experiments probing SO couplings in multi-subband wells.",1410.7358v2
+2021-05-07,"Electronic structure, electron-phonon coupling and superconductivity in noncentrosymmetric ThCoC2 from ab initio calculations","Superconductors without inversion symmetry in their crystal structure are
+known to exhibit unconventional properties. Recently, based on the measured
+temperature dependence of the magnetic field penetration depth,
+superconductivity in noncentrosymmetric $\mathrm{ThCoC_2}$ was proposed to be a
+nodal $d$-wave and mediated by the spin fluctuations. Moreover, a non-BCS
+behavior of the temperature dependence of the electronic specific heat and the
+magnetic upper critical field were reported. In this work, the electronic
+structure, phonons and electron-phonon coupling are studied in
+$\mathrm{ThCoC_2}$ on the basis of \textit{ab initio} computations. The effect
+of the spin-orbit coupling on the electronic structure and electron-phonon
+interaction is analyzed, and a large splitting of the electronic band structure
+is found. The calculated electron-phonon coupling constant $\lambda = 0.59$
+remains in decent agreement with the experimental estimates, suggesting that
+the electron-phonon interaction is strong enough to explain superconductivity
+with $T_c \simeq 2.5$~K. Nevertheless, we show that the conventional isotropic
+Eliashberg formalism is unable to describe the thermodynamic properties of the
+superconducting state, as calculated temperature dependence of the electronic
+specific heat and magnetic penetration depth deviate from experiments, which is
+likely driven by the strong spin-orbit coupling and inversion symmetry
+breaking. In addition, to shed more light on the pairing mechanism, we propose
+to measure the carbon isotope effect, as our calculations based on the
+electron-phonon coupling predict the observation of the isotope effect with an
+exponent $\alpha \simeq 0.15$.",2105.03472v2
+2022-09-01,Magnon dynamics in parity-time-symmetric dipolarly coupled waveguides and magnonic crystals,"We consider the magnonic properties of two dipolarly coupled magnetic
+stripes, both deposited on a normal conductive substrate with strong spin-orbit
+coupling. A charge current in the substrate acts on the adjacent magnets with
+spin-orbit torques, which result in magnonic damping or antidamping of the spin
+waves, and hence a gain-loss coupling of the two magnetic stripes. The whole
+setup is demonstrated to exhibit features typical for parity-time (PT)
+symmetric systems. Phenomena are demonstrated that can be functionalized in
+magnonic devices, including reconfigurable magnonic diodes and logic devices.
+Alternative stripes designs and PT-symmetric, periodic, coupled magnonic
+textures are studied. Analytical and full numerical analysis identify the
+conditions for the appearance of exceptional points (EPs), where magnonic gain
+and loss are balanced and evidence nonreciprocal magnon propagation and
+enhanced magnon excitation around EPs. Furthermore, the dipolar coupling is
+shown to bring in a wave vector-dependent PT-symmetric behavior. Proposing and
+simulating a PT-symmetric magnonic crystal, we show how EPs and hence
+associated phenomena can be steered to a particular wave vector in a gaped
+spectrum via material design. The phenomena offer additional tools for
+magnonic-based communication and computational devices.",2209.00180v1
+2004-07-21,Orbital magnetism in the half-metallic Heusler alloys,"Using the fully-relativistic screened Korringa-Kohn-Rostoker method I study
+the orbital magnetism in the half-metallic Heusler alloys. Orbital moments are
+almost completely quenched and they are negligible with respect to the spin
+moments. The change in the atomic-resolved orbital moments can be easily
+explained in terms of the spin-orbit strength and hybridization effects.
+Finally I discuss the orbital and spin moments derived from X-ray magnetic
+circular dichroism experiments.",0407560v1
+2014-11-11,Quantum Optics of Chiral Spin Networks,"We study the driven-dissipative dynamics of a network of spin-1/2 systems
+coupled to one or more chiral 1D bosonic waveguides within the framework of a
+Markovian master equation. We determine how the interplay between a coherent
+drive and collective decay processes can lead to the formation of pure
+multipartite entangled steady states. The key ingredient for the emergence of
+these many-body dark states is an asymmetric coupling of the spins to left and
+right propagating guided modes. Such systems are motived by experimental
+possibilities with internal states of atoms coupled to optical fibers, or
+motional states of trapped atoms coupled to a spin-orbit coupled Bose-Einstein
+condensate. We discuss the characterization of the emerging multipartite
+entanglement in this system in terms of the Fisher information.",1411.2963v2
+2019-01-29,Low-impedance superconducting microwave resonators for strong coupling to small magnetic mode volumes,"Recent experiments on strongly coupled microwave and ferromagnetic resonance
+modes have focused on large volume bulk crystals such as yttrium iron garnet,
+typically of millimeter-scale dimensions. We extend these experiments to lower
+volumes of magnetic material by exploiting low-impedance lumped-element
+microwave resonators. The low impedance equates to a smaller magnetic mode
+volume, which allows us to couple to a smaller number of spins in the
+ferromagnet. Compared to previous experiments, we reduce the number of
+participating spins by two orders of magnitude, while maintaining the strength
+of the coupling rate. Strongly coupled devices with small volumes of magnetic
+material may allow the use of spin orbit torques, which require high current
+densities incompatible with existing structures.",1901.10395v1
+2017-11-16,Yu-Shiba-Rusinov screening of spins in double quantum dots,"A magnetic impurity coupled to a superconductor gives rise to a
+Yu-Shiba-Rusinov (YSR) state inside the superconducting energy gap. With
+increasing exchange coupling the excitation energy of this state eventually
+crosses zero and the system switches to a YSR groundstate with bound
+quasiparticles screening the impurity spin by $\hbar/2$. Here we explore InAs
+nanowire double quantum dots tunnel coupled to a superconductor and demonstrate
+YSR screening of spin-1/2 and spin-1 states. Gating the double dot through 9
+different charge states, we show that the honeycomb pattern of zero-bias
+conductance peaks, archetypal of double dots coupled to normal leads, is
+replaced by lines of zero-energy YSR states. These enclose regions of
+YSR-screened dot spins displaying distinctive spectral features, and their
+characteristic shape and topology change markedly with tunnel coupling
+strengths. We find excellent agreement with a simple zero-bandwidth
+approximation, and with numerical renormalization group calculations for the
+two-orbital Anderson model.",1711.06081v1
+2021-05-18,"Spatial order in a two-dimensional spin-orbit-coupled spin-1/2 condensate: superlattice, multi-ring and stripe formation","We demonstrate the formation of stable spatially-ordered states in a {\it
+uniform} and also {\it trapped} quasi-two-dimensional (quasi-2D) Rashba or
+Dresselhaus spin-orbit (SO) coupled pseudo spin-1/2 Bose-Einstein condensate
+using the mean-field Gross-Pitaevskii equation. For weak SO coupling, one can
+have a circularly-symmetric $(0,+1)$- or $(0,-1)$-type multi-ring state with
+intrinsic vorticity, for Rashba or Dresselhaus SO coupling, respectively, where
+the numbers in the parentheses denote the net angular momentum projection in
+the two components, in addition to a circularly-asymmetric degenerate state
+with zero net angular momentum projection. For intermediate SO couplings, in
+addition to the above two types, one can also have states with stripe pattern
+in component densities with no periodic modulation in total density. The stripe
+state continues to exist for large SO coupling. In addition, a new
+spatially-periodic state appears in the uniform system: a superlattice state,
+possessing some properties of a supersolid, with a square-lattice pattern in
+component densities and also in total density. In a trapped system the
+superlattice state is slightly different with multi-ring pattern in component
+density and a square-lattice pattern in total density. For an equal mixture of
+Rashba and Dresselhaus SO couplings, in both uniform and trapped systems, only
+stripe states are found for all strengths of SO couplings. In a uniform system
+all these states are quasi-2D solitonic states.",2105.08849v3
+2018-09-11,Neutron Scattering Investigation of Rhenium Orbital Ordering in $3d-5d$ Double Perovskite Ca$_2$FeReO$_6$,"We have carried out inelastic neutron scattering experiments to study
+magnetic excitations in ordered double perovskite Ca$_2$FeReO$_6$. We found a
+well-defined magnon mode with a bandwidth of $\sim$50meV below the
+ferri-magnetic ordering temperature ($T_c\sim$520K), similar to previously
+studied Ba$_2$FeReO$_6$. The spin excitation is gapless for most temperatures
+within the magnetically ordered phase. However, a spin gap of $\sim$10meV opens
+up below $\sim$150K, which is well below the magnetic ordering temperature but
+coincides with a previously reported metal-insulator transition and onset of
+structural distortion. The observed temperature dependence of spin gap provides
+strong evidence for ordering of Re orbitals at $\sim$150~K, in accordance with
+earlier proposal put forward by Oikawa $\it{et.\,al}$ based on neutron
+diffraction [J. Phys. Soc. Jpn., $\bf{72}$, 1411 (2003)] as well as recent
+theoretical work by Lee and Marianetti [Phys. Rev. B, $\bf{97}$, 045102
+(2018)]. The presence of separate orbital and magnetic ordering in
+Ca$_2$FeReO$_6$ suggests weak coupling between spin and orbital degrees of
+freedom and hints towards a sub-dominant role played by spin orbit coupling in
+describing its magnetism. In addition, we observed only one well-defined magnon
+band near magnetic zone boundary, which is incompatible with simple
+ferrimagnetic spin waves arising from Fe and Re local moments, but suggests a
+strong damping of Re magnon mode.",1809.03647v2
+2018-09-29,Giant and anisotropic many-body spin-orbit tunability in a strongly correlated kagome magnet,"Owing to the unusual geometry of kagome lattices-lattices made of
+corner-sharing triangles-their electrons are useful for studying the physics of
+frustrated, correlated and topological quantum electronic states. In the
+presence of strong spin-orbit coupling, the magnetic and electronic structures
+of kagome lattices are further entangled, which can lead to hitherto unknown
+spin-orbit phenomena. Here we use a combination of vector-magnetic-field
+capability and scanning tunnelling microscopy to elucidate the spin-orbit
+nature of the kagome ferromagnet Fe3Sn2 and explore the associated exotic
+correlated phenomena. We discover that a many-body electronic state from the
+kagome lattice couples strongly to the vector field with three-dimensional
+anisotropy, exhibiting a magnetization-driven giant nematic
+(two-fold-symmetric) energy shift. Probing the fermionic quasi-particle
+interference reveals consistent spontaneous nematicity-a clear indication of
+electron correlation-and vector magnetization is capable of altering this
+state, thus controlling the many-body electronic symmetry. These spin-driven
+giant electronic responses go well beyond Zeeman physics and point to the
+realization of an underlying correlated magnetic topological phase. The
+tunability of this kagome magnet reveals a strong interplay between an
+externally applied field, electronic excitations and nematicity, providing new
+ways of controlling spin-orbit properties and exploring emergent phenomena in
+topological or quantum materials.",1810.00218v1
+2014-12-22,Inverse magneto-refraction as a mechanism for laser modification of spin-spin exchange parameters and subsequent terahertz emission from iron oxides,"Ultrafast non-thermal manipulation of magnetization by light relies on either
+indirect coupling of the electric field component of the light with spins via
+spin-orbit interaction or direct coupling between the magnetic field component
+and spins. Here we propose a novel scenario for coupling between the electric
+field of light and spins via optical modification of the exchange interaction,
+one of the strongest quantum effects, the strength of which can reach 1000
+Tesla. We demonstrate that this isotropic opto-magnetic effect, which can be
+called the inverse magneto-refraction, is allowed in a material of any
+symmetry. Its existence is corroborated by the experimental observation of THz
+emission by magnetic-dipole active spin resonances optically excited in a broad
+class of iron oxides with a canted spin configuration. From its strength we
+estimate that a sub-picosecond laser pulse with a moderate fluence of ~ 1
+mJ/cm^2 acts as a pulsed effective magnetic field of 0.01 Tesla, arising from
+the optically perturbed balance between the exchange parameters. Our findings
+are supported by a low-energy theory for the microscopic magnetic interactions
+between non-equilibrium electrons subjected to an optical field which suggests
+a possibility to modify the exchange interactions by light over 1 %.",1412.7094v1
+2018-07-09,Cavity-induced emergent topological spin textures in a Bose Einstein condensate,"The coupled nonlinear dynamics of ultracold quantum matter and
+electromagnetic field modes in an optical resonator exhibits a wealth of
+intriguing collective phenomena. Here we study a $\Lambda$-type,
+three-component Bose-Einstein condensate coupled to four dynamical running-wave
+modes of a ring cavity, where only two of the modes are externally pumped.
+However, the unpumped modes play a crucial role in the dynamics of the system
+due to coherent back-scattering of photons. On a mean- field level we identify
+three fundamentally different steady-state phases with distinct characteristics
+in the density and spatial spin textures: a combined density and spin wave, a
+continuous spin spiral with a homogeneous density, and a spin spiral with a
+modulated density. The spin-spiral states, which are topological, are
+intimately related to cavity-induced spin-orbit coupling emerging beyond a
+critical pump power. The topologically trivial density-wave--spin-wave state
+has the characteristics of a supersolid with two broken continuous symmetries.
+The transitions between different phases are either simultaneously topological
+and first order, or second order. The proposed setup allows the simulation of
+intriguing many-body quantum phenomena by solely tuning the pump amplitudes and
+frequencies, with the cavity output fields serving as a built-in nondestructive
+observation tool.",1807.03316v1
+2017-11-23,Spin-Interaction Effects for Ultralong-range Rydberg Molecules in a Magnetic Field,"We investigate the fine and spin structure of ultralong-range Rydberg
+molecules exposed to a homogeneous magnetic field. Each molecule consists of a
+$^{87}$Rb Rydberg atom whose outer electron interacts via spin-dependent $s$-
+and p-wave scattering with a polarizable $^{87}$Rb ground state atom. Our model
+includes also the hyperfine structure of the ground state atom as well as
+spin-orbit couplings of the Rydberg and ground state atom. We focus on
+$d$-Rydberg states and principal quantum numbers $n$ in the vicinity of 40. The
+electronic structure and vibrational states are determined in the framework of
+the Born-Oppenheimer approximation for varying field strengths ranging from a
+few up to hundred Gau{\ss}. The results show that the interplay between the
+scattering interactions and the spin couplings gives rise to a large variety of
+molecular states in different spin configurations as well as in different
+spatial arrangements that can be tuned by the magnetic field. This includes
+relatively regularly shaped energy surfaces in a regime where the Zeeman
+splitting is large compared to the scattering interaction but small compared to
+the Rydberg fine structure, as well as more complex structures for both, weaker
+and stronger fields. We quantify the impact of spin couplings by comparing the
+extended theory to a spin-independent model.",1711.08748v2
+2019-06-18,Noninertial and spin effects on the 2D Dirac oscillator in the magnetic cosmic string background,"In this work, we analyze the influence of noninertial and spin effects on the
+dynamics of the 2D Dirac oscillator in the magnetic cosmic string background.
+To model this background, we consider a uniform magnetic field, the
+Aharonov-Bohm effect, and a parameter $\eta$ generated by a cosmic string.
+Posteriorly, we determine the bound-state solutions of the system: the Dirac
+spinor and the relativistic energy spectrum. We verified that this spinor is
+written in terms of the generalized Laguerre polynomials and this spectrum
+depends on the effective quantum number $N_r$, angular velocity $\Omega$ and
+parameter $s$ associated to the noninertial and spin effects, magnetic flux
+$\Phi$, cyclotron frequency $\omega_c$, zero-point energy $E_0$, and on the
+deficit angle $\eta$. In particular, we note that besides this spectrum to be a
+periodic function and asymmetric, its values infinitely increase when $\eta\to
+0$ or $N_r=\omega_c=\Omega\to\infty$. We also note that the energies of the
+antiparticle with spin down are larger than of the particle with spin up or
+down. In the nonrelativistic limit, we get the Schr\""{o}dinger-Pauli oscillator
+with two types of couplings: the spin-orbit coupling and the spin-rotation
+coupling, and two Hamiltonians: one quantum harmonic oscillator-type and other
+Zeeman-type. Finally, we compare our results with other works, where we
+verified that our problem generalizes some particular cases of the literature
+when $\Omega$, $\omega_c$, $\Phi$, $s$ or $\eta$ are excluded from the system.",1906.07369v2
+2022-07-30,"Coupled spin-valley, Rashba effect and hidden persistent spin polarization in WSi$_2$N$_4$ family","The new two-dimensional materials, MoSi$_2$N$_4$ and WSi$_2$N$_4$ are
+experimentally synthesized successfully and various similar structures are
+predicted theoretically. Here, we report the electronic properties with a
+special focus on the band splitting in WA$_2$Z$_4$ (A=Si, Ge; Z=N, P, As),
+using state-of-the-art density functional theory and many-body perturbation
+theory (within the framework of G$_0$W$_0$ and BSE). Due to the broken
+inversion symmetry and strong spin-orbit coupling effects, we detect coupled
+spin-valley effects at the corners of the first Brillouin zone (BZ).
+Additionally, we observe cubically and linearly split bands around the $\Gamma$
+and M points, respectively. Interestingly, the in-plane mirror symmetry
+($\sigma_h$) and the reduced symmetry of arbitrary $k$-point, enforce the
+persistent spin textures (PST) to occur in full BZ. We induce the Rashba
+splitting by breaking the $\sigma_h$ through an out-of-plane external electric
+field (EEF). The inversion asymmetric site point group of the W atom introduces
+the hidden spin polarization in centrosymmetric layered bulk counterparts.
+Therefore, the spin-layer locking effect, namely, energy degenerate opposite
+spins spatially segregated in the top and bottom W layers, has been identified.
+Our low energy $k.p$ model demonstrates that the PST along the M-K line is
+robust to EEF and layer thickness, making them suitable for applications in
+spintronics and valleytronics.",2208.00127v1
+2023-01-12,Type II multiferroic order in two-dimensional transition metal halides from first principles spin-spiral calculations,"We present a computational search for spin spiral ground states in
+two-dimensional transition metal halides that are experimentally known as van
+der Waals bonded bulk materials. Such spin spirals break the rotational
+symmetry of the lattice and lead to polar ground states where the axis of
+polarization is strongly coupled to the magnetic order (type II multiferroics).
+We apply the generalized Bloch theorem in conjunction with non-collinear
+density functional theory calculations to find the spiralling vector that
+minimizes the energy and then include spin-orbit coupling to calculate the
+preferred orientation of the spin plane with respect to the spiral vector. We
+find a wide variety of magnetic orders ranging from ferromagnetic, stripy
+anti-ferromagnetic, 120$^\circ$ non-collinear structures and incommensurate
+spin spirals. The latter two introduce polar axes and are found in the majority
+of materials considered here. The spontaneous polarization is calculated for
+the incommensurate spin spirals by performing full supercell relaxation
+including spinorbit coupling and the induced polarization is shown to be
+strongly dependent on the orientation of the spiral planes. We also test the
+effect of Hubbard corrections on the results and find that for most materials
+LDA+U results agree qualitatively with LDA. An exception is the Mn halides,
+which are found to exhibit incommensurate spin spiral ground states if Hubbard
+corrections are included whereas bare LDA yields a 120$^\circ$ non-collinear
+ground state.",2301.05107v1
+2018-09-04,Chiral magnetic interlayer coupling in synthetic antiferromagnets,"The exchange coupling underlies ferroic magnetic coupling and is thus the key
+element that governs statics and dynamics of magnetic systems. This fundamental
+interaction comes in two flavors - symmetric and antisymmetric coupling. While
+symmetric coupling leads to ferro- and antiferromagnetism, antisymmetric
+coupling has attracted significant interest owing to its major role in
+promoting topologically non-trivial spin textures that promise high-speed and
+energy-efficient devices. So far, the antisymmetric exchange coupling rather
+short-ranged and limited to a single magnetic layer has been demonstrated,
+while the symmetric coupling also leads to long-range interlayer exchange
+coupling. Here, we report the missing component of the long-range antisymmetric
+interlayer exchange coupling in perpendicularly magnetized synthetic
+antiferromagnets with parallel and antiparallel magnetization alignments.
+Asymmetric hysteresis loops under an in-plane field unambiguously reveal a
+unidirectional and chiral nature of this novel interaction, which cannot be
+accounted for by existing coupling mechanisms, resulting in canted
+magnetization alignments. This can be explained by spin-orbit coupling combined
+with reduced symmetry in multilayers. This new class of chiral interaction
+provides an additional degree of freedom for engineering magnetic structures
+and promises to enable a new class of three-dimensional topological structures.",1809.01080v2
+2017-07-07,"Universal magneto-orbital ordering in the divalent $A$-site quadruple perovskite manganites $A$Mn$_7$O$_{12}$ ($A$ = Ca, Sr, Cd, and Pb)","Through analysis of variable temperature neutron powder diffraction data, we
+present solutions for the magnetic structures of SrMn$_7$O$_{12}$,
+CdMn$_7$O$_{12}$, and PbMn$_7$O$_{12}$ in all long-range ordered phases. The
+three compounds were found to have magnetic structures analogous to that
+reported for CaMn$_7$O$_{12}$. They all feature a higher temperature lock-in
+phase with \emph{commensurate} magneto-orbital coupling, and a delocked,
+multi-\textbf{k} magnetic ground state where \emph{incommensurate}
+magneto-orbital coupling gives rise to a constant-moment magnetic helix with
+modulated spin helicity. CdMn$_7$O$_{12}$ represents a special case in which
+the orbital modulation is commensurate with the crystal lattice and involves
+stacking of fully and partially polarized orbital states. Our results provide a
+robust confirmation of the phenomenological model for magneto-orbital coupling
+previously presented for CaMn$_7$O$_{12}$. Furthermore, we show that the model
+is universal to the $A^{2+}$ quadruple perovskite manganites synthesised to
+date, and that it is tunable by selection of the $A$-site ionic radius.",1707.02218v1
+2019-08-07,"Continuous monitoring of a trapped, superconducting spin","Readout and control of fermionic spins in solid-state systems are key
+primitives of quantum information processing and microscopic magnetic sensing.
+The highly localized nature of most fermionic spins decouples them from
+parasitic degrees of freedom, but makes long-range interoperability difficult
+to achieve. In light of this challenge, an active effort is underway to
+integrate fermionic spins with circuit quantum electrodynamics (cQED), which
+was originally developed in the field of superconducting qubits to achieve
+single-shot, quantum-non-demolition (QND) measurements and long-range
+couplings. However, single-shot readout of an individual spin with cQED has
+remained elusive due to the difficulty of coupling a resonator to a particle
+trapped by a charge-confining potential. Here we demonstrate the first
+single-shot, cQED readout of a single spin. In our novel implementation, the
+spin is that of an individual superconducting quasiparticle trapped in the
+Andreev levels of a semiconductor nanowire Josephson element. Due to a
+spin-orbit interaction inside the nanowire, this ""superconducting spin""
+directly determines the flow of supercurrent through the element. We harnessed
+this spin-dependent supercurrent to achieve both a zero-field spin splitting as
+well as a long-range interaction between the quasiparticle and a
+superconducting microwave resonator. Owing to the strength of this interaction
+in our device, measuring the resultant spin-dependent resonator frequency
+yielded QND spin readout with 92% fidelity in 1.9 $\mu$s and allowed us to
+monitor the quasiparticle's spin in real time. These results pave the way for
+new ""fermionic cQED"" devices: superconducting spin qubits operating at zero
+magnetic field, devices in which the spin has enhanced governance over the
+circuit, and time-domain measurements of Majorana modes.",1908.02800v1
+2023-10-31,Strong hole-photon coupling in planar Ge: probing the charge degree and Wigner molecule states,"Semiconductor quantum dots (QDs) in planar germanium (Ge) heterostructures
+have emerged as frontrunners for future hole-based quantum processors. Notably,
+the large spin-orbit interaction of holes offers rapid, coherent electrical
+control of spin states, which can be further beneficial for interfacing hole
+spins to microwave photons in superconducting circuits via coherent
+charge-photon coupling. Here, we present strong coupling between a hole charge
+qubit, defined in a double quantum dot (DQD) in a planar Ge, and microwave
+photons in a high-impedance ($Z_\mathrm{r} = 1.3 ~ \mathrm{k}\Omega$)
+superconducting quantum interference device (SQUID) array resonator. Our
+investigation reveals vacuum-Rabi splittings with coupling strengths up to
+$g_{0}/2\pi = 260 ~ \mathrm{MHz}$, and a cooperativity of $C \sim 100$,
+dependent on DQD tuning, confirming the strong charge-photon coupling regime
+within planar Ge. Furthermore, utilizing the frequency tunability of our
+resonator, we explore the quenched energy splitting associated with
+strongly-correlated Wigner molecule (WM) states that emerge in Ge QDs. The
+observed enhanced coherence of the WM excited state signals the presence of
+distinct symmetries within related spin functions, serving as a precursor to
+the strong coupling between photons and spin-charge hybrid qubits in planar Ge.
+This work paves the way towards coherent quantum connections between remote
+hole qubits in planar Ge, required to scale up hole-based quantum processors.",2310.20661v1
+2021-06-09,Maximizing Spin-Orbit Torque Generated by the Spin Hall Effect of Pt,"Efficient generation of spin-orbit torques (SOTs) is central for the exciting
+field of spin-orbitronics. Platinum, the archetypal spin Hall material, has the
+potential to be an outstanding provider for spin-orbit torques due to its giant
+spin Hall conductivity, low resistivity, high stabilities, and the ability to
+be compatible with CMOS circuits. However, pure clean-limit Pt with low
+resistivity still provides a low damping-like spin-orbit torque efficiency,
+which limits its practical applications. The efficiency of spin-orbit torque in
+Pt-based magnetic heterostructures can be improved considerably by increasing
+the spin Hall ratio of Pt and spin transmissivity of the interfaces. Here we
+reviews recent advances in understanding the physics of spin current
+generation, interfacial spin transport, and the metrology of spin-orbit
+torques, and summarize progress towards the goal of Pt-based spin-orbit torque
+memories and logic that are fast, efficient, reliable, scalable, and
+non-volatile.",2106.04992v2
+2023-11-09,Orbital-selective Superconductivity in the Pressurized Bilayer Nickelate La$_3$Ni$_2$O$_7$: An Infinite Projected Entangled-Pair State Study,"The newly discovered high-$T_c$ nickelate superconductor La$_3$Ni$_2$O$_7$
+has generated significant research interest. To uncover the pairing mechanism,
+it is essential to investigate the intriguing interplay between the two $e_g$,
+i.e., $d_{x^2-y^2}$ and $d_{z^2}$ orbitals. Here we perform an infinite
+projected entangled-pair state (iPEPS) study of the bilayer $t$-$J$ model,
+directly in the thermodynamic limit and with orbitally selective parameters for
+$d_{x^2-y^2}$ and $d_{z^2}$ orbitals, respectively. The $d_{x^2-y^2}$ electrons
+exhibit significant intralayer hopping $t_\parallel$ and spin couplings
+$J_\parallel$, with interlayer $J_\perp$ passed from the $d_{z^2}$ electrons.
+However, the interlayer $t_\perp$ is negligible in this case. In contrast, the
+$d_{z^2}$ orbital demonstrates strong interlayer $t_\perp$ and $J_\perp$, while
+the inherent intralayer $t_\parallel$ and $J_\parallel$ are small. Based on the
+iPEPS results, we find clear orbital-selective behaviors in La$_3$Ni$_2$O$_7$.
+The $d_{x^2-y^2}$ orbitals exhibit robust superconductive (SC) order driven by
+the interlayer coupling $J_\perp$; while the $d_{z^2}$ band shows relatively
+weak SC order even if we artificially introduce some $t_\parallel$ to it.
+Furthermore, by substituting rare-earth element Pm or Sm with La, we find an
+enhanced SC order, which opens up a promising avenue for discovering nickelate
+superconductors with even higher $T_c$.",2311.05491v2
+2016-07-08,Morphology effects on spin-dependent transport and recombination in polyfluorene thin films,"We have studied the role of spin-dependent processes on conductivity in
+polyfluorene (PFO) thin films by conducting continuous wave (c.w.) electrically
+detected magnetic resonance (EDMR) spectroscopy at temperatures between 10 K
+and 293 K using microwave frequencies between about 100 MHz and 20 GHz as well
+as pulsed EDMR at X-band. Variable frequency EDMR allows us to establish the
+role of spin-orbit coupling in spin-dependent processes, pulsed EDMR probes
+coherent spin motion effects. We used PFO for this study in order to allow for
+the investigation of the effects of microscopic morphological ordering since
+this material can adopt two distinct intrachain morphologies: an amorphous
+(glassy) phase, and an ordered (beta) phase. In thin films of organic
+light-emitting diodes (OLEDs) the appearance of a particular phase can be
+controlled by deposition parameters, and is verified by electroluminescence
+spectroscopy. We conducted multi-frequency c.w. EDMR, electrically detected
+Rabi spinbeat experiments, Hahn-echo and inversion-recovery measurements.
+Coherent echo spectroscopy reveals electrically detected electron spin-echo
+envelope modulation (ESEEM) due to the precession of the carrier spins around
+the protons. Our results demonstrate that while conformational disorder can
+influence the observed EDMR signals, including the sign of the current changes
+on resonance as well as the magnitudes of local hyperfine fields and charge
+carrier spin-orbit interactions, it does not qualitatively affect the nature of
+spin-dependent transitions in this material. At 293 K and 10 K, polaron-pair
+recombination through weakly spin-spin coupled intermediate charge carrier pair
+states is dominant, while at low temperatures, additional signatures of
+spin-dependent charge transport through the interaction of polarons with
+triplet excitons are seen in the half-field resonance of a triplet spin-1
+species.",1607.02462v1
+2019-12-19,Magnon-driven chiral charge and spin pumping and electron-magnon scattering from time-dependent quantum transport combined with atomistic spin dynamics theory,"Using newly developed quantum-classical hybrid framework, we investigate
+interaction between spin-polarized conduction electrons and a single spin wave
+(SW) coherently excited within a metallic ferromagnetic nanowire. When the
+nanowire hosting SW is attached to two normal metal (NM) leads, with no dc bias
+voltage applied between them, the SW pumps chiral electronic charge and spin
+currents into the leads---their direction is tied to the direction of SW
+propagation and they scale linearly with the frequency of the precession. This
+is in contrast to: standard pumping by the uniform precession mode with
+identical spin currents flowing in both directions and no accompanying charge
+current; or experimentally observed [C.~Ciccarelli et al., Nat. Nanotech. 10,
+50 (2014); M.~Evelt et al., Phys. Rev. B 95, 024408 (2017)] magnonic charge
+pumping which requires spin-orbit coupling spin-orbit coupling. The mechanism
+behind our prediction is nonadiabaticity due to time-retardation
+effects---motion of localized magnetic moment affects conduction electron spin
+in a retarded way, so that it takes a finite time until the electron spin
+reacts to the motion of the classical vector. Upon injecting dc spin-polarized
+charge current from the left NM lead, electrons interact with SW where
+outflowing charge and spin current into the right NM lead are changed due to
+both scattering off time-dependent potential generated by the SW and
+superposition with the currents pumped by the SW itself. Using Lorentzian
+voltage pulse to excite leviton out of the Fermi sea, which carries one
+electron charge with no accompanying electron-hole pairs and behaves as
+soliton-like quasiparticle, we describe how a single electron interacts with a
+single SW.",1912.09452v2
+2018-10-19,Theoretical evidence of spin-orbital-entangled $J_{\mathbf{eff}}$=1/2 state in the 3$d$ transition metal oxide CuAl$_2$O$_4$,"Transition metal oxides exhibit various competing phases and exotic phenomena
+depending on how their reaction to the rich degeneracy of the $d$-orbital.
+Large spin-orbit coupling (SOC) reduces this degeneracy in a unique way by
+providing a spin-orbital-entangled ground state for 4$d$ and 5$d$ transition
+metal compounds. In particular, the spin-orbital-entangled Kramers doublet,
+known as the $J_{\mathbf{eff}}$=1/2 pseudospin, appears in layered iridates and
+$\alpha$-RuCl$_3$, manifesting a relativistic Mott insulating phase. Such
+entanglement, however, seems barely attainable in 3$d$ transition metal oxides,
+where the SOC is small and the orbital angular momentum is easily quenched.
+From experimental and theoretical evidence, here we report on the CuAl$_2$O$_4$
+spinel as the first example of a $J_{\mathbf{eff}}$=1/2 Mott insulator in 3$d$
+transition metal compounds. Based on the experimental study, including
+synthesis of the cubic CuAl$_2$O$_4$ single crystal, density functional theory
+and dynamical mean field theory calculations reveal that the
+$J_{\mathbf{eff}}$=1/2 state survives the competition with an
+orbital-momentum-quenched $S$=1/2 state. The electron-addition spectra probing
+unoccupied states are well described by the $j_{\mathbf{eff}}$=1/2 hole state,
+whereas electron-removal spectra have a rich multiplet structure. The fully
+relativistic entity found in CuAl$_2$O$_4$ provides new insight into the
+untapped regime where the spin-orbital-entangled Kramers pair coexists with
+strong electron correlation.",1810.08594v3
+2016-07-27,"Theory of proximity-induced exchange coupling in graphene on hBN/(Co, Ni)","We perform systematic first-principles calculations of the proximity exchange
+coupling, induced by cobalt (Co) and nickel (Ni) in graphene, via a few (up to
+three) layers of hexagonal boron nitride (hBN). We find that the induced spin
+splitting of the graphene bands is of the order of 10 meV for a monolayer of
+hBN, decreasing in magnitude but alternating in sign by adding each new
+insulating layer. We find that the proximity exchange can be giant if there is
+a resonant $d$ level of the transition metal close to the Dirac point. Our
+calculations suggest that this effect could be present in Co heterostructures,
+in which a $d$ level strongly hybridizes with the valence-band orbitals of
+graphene. Since this hybridization is spin dependent, the proximity spin
+splitting is unusually large, about 10 meV even for two layers of hBN. An
+external electric field can change the offset of the graphene and
+transition-metal orbitals and can lead to a reversal of the sign of the
+exchange parameter. This we predict to happen for the case of two monolayers of
+hBN, enabling electrical control of proximity spin polarization (but also spin
+injection) in graphene/hBN/Co structures. Nickel-based heterostructures show
+weaker proximity effects than cobalt heterostructures. We introduce two
+phenomenological models to describe the first-principles data. The minimal
+model comprises the graphene (effective) $p_z$ orbitals and can be used to
+study transport in graphene with proximity exchange, while the $p_z$-$d$ model
+also includes hybridization with $d$ orbitals, which is important to capture
+the giant proximity exchange. Crucial to both models is the
+pseudospin-dependent exchange coupling, needed to describe the different spin
+splittings of the valence and conduction bands.",1607.08008v2
+2018-10-10,Spin-Orbital Entangled Liquid State in the Copper Oxide Ba$_3$CuSb$_2$O$_9$,"Structure with orbital degeneracy is unstable toward spontaneous distortion.
+Such orbital correlation usually has a much higher energy scale than spins, and
+therefore, magnetic transition takes place at a much lower temperature, almost
+independently from orbital ordering. However, when the energy scales of
+orbitals and spins meet, there is a possibility of spin-orbital entanglement
+that would stabilize novel ground state such as spin-orbital liquid and random
+singlet state. Here we review on such a novel spin-orbital magnetism found in
+the hexagonal perovskite oxide Ba$_3$CuSb$_2$O$_9$, which hosts a
+self-organized honeycomblike short-range order of a strong Jahn-Teller ion
+Cu$^{2+}$. Comprehensive structural and magnetic measurements have revealed
+that the system has neither magnetic nor Jahn-Teller transition down to the
+lowest temperatures, and Cu spins and orbitals retain the hexagonal symmetry
+and paramagnetic state. Various macroscopic and microscopic measurements all
+indicate that spins and orbitals remain fluctuating down to low temperatures
+without freezing, forming a spin-orbital entangled liquid state.",1810.04346v1
+2001-05-11,Spectacular doping dependence of interlayer exchange and other results on spin waves in bilayer manganites,"We report the measurement of spin waves in the bilayer colossal
+magnetoresistive manganites La(2-2x)Sr(1+2x)Mn2O7 with x=0.30, 0.35 and 0.40.
+For x=0.35 and 0.40 the entire acoustic and optic dispersion relations are
+reasonably well described by those for a bilayer Heisenberg Hamiltonian with
+nearest neighbour exchange only. The in-plane coupling is only weakly dependent
+on x, but the coupling between the planes of a bilayer changes by a factor of
+four. The results directly reveal the change from mixed and character of the
+orbitals to mostly character with increasing hole concentration.",0105230v1
+2002-07-03,Planar spin exchange in LiNiO_2,"We study the planar spin exchange couplings in LiNiO2 using a perturbative
+approach. We show that the inclusion of the trigonal crystal field splitting at
+the Oxygen sites leads to the appearance of antiferromagnetic exchange
+integrals in deviation from the Goodenough-Kanamori-Anderson rules for this 90
+degree bond. That gives a microscopic foundation for the recently observed
+coexistence of ferromagnetic and antiferromagnetic couplings in the
+orbitally-frustrated state of LiNiO2. (F. Reynaud et al, Phys. Rev. Lett. 86,
+3638 (2001))",0207104v1
+1995-05-02,Mixed Symmetry Solutions of Generalized Three-Particle Bargmann-Wigner Equations in the Strong-Coupling Limit,"Starting from a nonlinear isospinor-spinor field equation, generalized
+three-particle Bargmann-Wigner equations are derived. In the strong-coupling
+limit, a special class of spin 1/2 bound-states are calculated. These solutions
+which are antisymmetric with respect to all indices, have mixed symmetries in
+isospin-superspin space and in spin orbit space. As a consequence of this mixed
+symmetry, we get three solution manifolds. In appendix \ref{b}, table 2, these
+solution manifolds are interpreted as the three generations of leptons and
+quarks. This interpretation will be justified in a forthcoming paper.",9505015v1
+2004-05-14,The library of subroutines for calculation of matrix elements of two-particle operators for many-electron atoms,"In this paper a library for spin--angular integration in LS-coupling for
+many-electron atoms is presented. The software is an implementation of a
+methodology based on the second quantization in coupled tensorial form, the
+angular momentum theory in 3 spaces (orbital, spin and quasispin), and the
+graphical technique of angular momentum. This implementation extends
+applications of the relevant methodology to open f- shells and leads to faster
+execution of angular integration codes. The possibility of using some library
+routines for solving various angular momentum problems in atomic physics is
+also discussed.",0405072v1
+2004-05-15,Integration over spin-angular variables in atomic physics,"A review of methods for finding general expressions for matrix elements
+(non-diagonal with respect to configurations included) of any one- and
+two-particle operator for an arbitrary number of shells in an atomic
+configuration is given. These methods are compared in various aspects, and the
+advantages or shortcomings of each particular method are discussed. Efficient
+method to find the abovementioned quantities in LS coupling is presented, based
+on the use of symmetry properties of operators and matrix elements in three
+spaces (orbital, spin and quasispin), second quantization in coupled tensorial
+form, graphical technique and Wick's theorem. This allows to efficiently
+account for correlation effects practically for any atom and ion of periodical
+table.",0405078v1
+2010-06-21,Exact Solution of the Klein-Gordon Equation for the Hydrogen Atom Including Electron Spin,"The term describing the coupling between total angular momentum and
+energy-momentum in the hydrogen atom is isolated from the radial Dirac equation
+and used to replace the corresponding orbital angular momentum coupling term in
+the radial K-G equation. The resulting spin-corrected K-G equation is a second
+order differential equation that contains no matrices. It is solved here to
+generate the same energy eigenvalues for the hydrogen atom as the Dirac
+equation.",1006.3971v1
+2010-08-27,Electromagnons in the spin collinear state of a triangular lattice antiferromagnet,"Terahertz time-domain spectroscopy was performed to directly probe the
+low-energy (1-5 meV) electrodynamics of triangular lattice antiferromagnets
+CuFe1-xGaxO2 (x = 0.00, 0.01, and 0.035). We discovered an electromagnon
+(electric-field-active magnon) excitation at 2.3 meV in the paraelectric
+up-up-down-down collinear magnetic phase, while this electromagnon vanishes in
+the ferroelectric helimagnetic phase. Anti-correlation with noncollinear
+magnetism excludes the exchange-striction mechanism as the origin of dynamical
+magnetoelectric coupling, and hence evidences the observation of spin-orbit
+coupling mediated electromagnon in the present compound.",1008.4709v1
+2011-03-16,Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7,"A joint theoretical approach, combining macroscopic symmetry analysis with
+microscopic methods (density functional theory and model cluster Hamiltonian),
+is employed to shed light on magnetoelectricity in Ba2CoGe2O7. We show that the
+recently reported experimental trend of polarization guided by magnetic field
+can be predicted on the basis of phenomenological Landau theory. From the
+microscopic side, Ba2CoGe2O7 emerges as a prototype of a class of
+magnetoelectrics, where the cross coupling between magnetic and dipolar degrees
+of freedom needs, as main ingredients, the on-site spin-orbit coupling and the
+spin-dependent O p - Co d hybridization, along with structural constraints
+related to the noncentrosymmetric structural symmetry and the peculiar
+configuration of CoO4 tetrahedrons.",1103.3151v1
+2011-07-14,Electrically controlled quantum gates for two-spin qubits in two double quantum dots,"Exchange-coupled singlet-triplet spin qubits in two gate-defined double
+quantum dots are considered theoretically. Using charge density operators to
+describe the double-dot orbital states, we calculate the Coulomb couplings
+between the qubits, and identify optimal bias points for single- and two-qubit
+operations, as well as convenient idle positions. The same intuitive
+formulation is used to derive dephasing rates of these qubits due to the
+fluctuating charge environment, thereby providing the main considerations for a
+quantum computation architecture that is within current experimental
+capabilities.",1107.2968v1
+2014-01-29,Quantum magnetism of ultracold atoms with a dynamical pseudospin degree of freedom,"We consider bosons in a Hubbard lattice with an SU($\cal N$) pseudospin
+degree of freedom which is made dynamical via a coherent transfer term. It is
+shown that, in the basis which diagonalizes the pseudospin coupling, a generic
+hopping process affects the spin state, similar to a spin-orbit coupling. This
+results, for the system in the Mott phase, in a ferromagnetic phase with
+variable quantization axis. In extreme cases, it can even give rise to
+antiferromagnetic order.",1401.7608v1
+2019-07-05,Rashba cavity QED: a route towards the superradiant quantum phase transition,"We develop a theory of cavity quantum electrodynamics for a 2D electron gas
+in the presence of Rashba spin-orbit coupling and perpendicular static magnetic
+field, coupled to spatially nonuniform multimode quantum cavity photon fields.
+We demonstrate that the lowest polaritonic frequency of the full Hamiltonian
+can vanish for realistic parameters, achieving the Dicke superradiant quantum
+phase transition. This singular behaviour originates from soft spin-flip
+transitions possessing a non-vanishing dipole moment at non-zero wave vectors
+and can be viewed as a magnetostatic instability.",1907.02938v1
+2017-09-05,Voltage control of interface rare-earth magnetic moments,"The large spin orbit interaction in rare earth atoms implies a strong
+coupling between their charge and spin degrees of freedom. We formulate the
+coupling between voltage and the local magnetic moments of rare earth atoms
+with partially filled 4f shell at the interface between an insulator and a
+metal. The rare earth-mediated torques allow power-efficient control of
+spintronic devices by electric field-induced ferromagnetic resonance and
+magnetization switching.",1709.01271v1
+2018-08-10,Anomalous Josephson Effect in S/SO/F/S heterostructures,"We study the anomalous Josephson effect, as well as the dependence on the
+direction of the critical Josephson current, in an S/N/S junction, where the
+normal part is realized by alternating spin-orbit coupled and ferromagnetic
+layers. We show that to observe these effects it is sufficient to break spin
+rotation and time reversal symmetry in spatially separated regions of the
+junction. Moreover, we discuss how to further improve these effects by
+engineering multilayers structures with more that one couple of alternating
+layers.",1808.03475v1
+2020-09-26,Majorana Zero Modes in Cylindrical Semiconductor Quantum Wire,"We study Majorana zero modes properties in cylindrical cross-section
+semiconductor quantum wires based on the $k \cdot p$ theory and a discretized
+lattice model. Within this model, the influence of disorder potentials in the
+wire and amplitude and phase fluctuations of the superconducting
+order-parameter are discussed. We find that for typical wire geometries,
+pairing potentials, and spin-orbit coupling strengths, coupling between
+quasi-one-dimensional sub-bands is weak, low-energy quasiparticles near the
+Fermi energy are nearly completely spin-polarized, and the number of electrons
+in the active sub-bands of topological states is small.",2009.12640v1
+2022-02-14,Optimizing the topological properties of stacking semiconductor-ferromagnet-superconductor heterostructures,"We study the electronic properties of a planar semiconductor-superconductor
+heterostructure, in which a thin ferromagnetic insulator layer lies in between
+and acts as a spin filtering barrier. We find that in such a system one can
+simultaneously enhance the strengths of all the three important induced
+physical quantities, i.e., Rashba spin-orbit coupling, exchange coupling, and
+superconducting pairing potential, for the hybrid mode by external gating. Our
+results show specific advantage of this stacked device geometry compared to
+conventional devices. We further discuss how to optimize geometrical parameters
+for the heterostructure and complement our numerical simulations with analytic
+calculations.",2202.06604v1
+2023-06-29,Bardasis-Schrieffer-like phase mode in a superconducting bilayer,"We theoretically study the low-lying collective modes of an even-parity
+spin-singlet superconducting bilayer, where strong spin-orbit coupling leads to
+a closely competing odd-parity pairing state. We develop a gauge-invariant
+theory for the coupling of phase fluctuations to an external electromagnetic
+field and show that the competing odd-parity pairing instability gives rise to
+a Bardasis-Schrieffer-like phase mode within the excitation gap. Accounting for
+the long-range Coulomb interaction, however, we find that this mode is
+converted into an antisymmetric plasmon and is likely pushed into the
+quasiparticle continuum.",2306.16611v2
+2015-05-15,Orbital selectivity and emergent superconducting state from quasi-degenerate $s-$ and $d-$wave pairing channels in iron-based superconductors,"A major puzzle about the nature of the iron-based superconductivity appears
+in the case of the alkaline iron selenides. Compared to the iron pnictides,
+these systems have only electron Fermi pockets (i.e. no hole Fermi pockets) but
+comparable superconducting transition temperatures. The challenge lies in
+reconciling the two basic experimental features of their superconducting state:
+a node-less gap and the existence of a resonance in the spin excitation
+spectrum. We propose a mechanism based on reconstructing two quasi-degenerate
+pairing states, one in an $s$-wave $A_{1g}$ channel that is fully gapped, and
+the other in a $d$-wave $B_{1g}$ channel whose pairing function changes sign
+across the electron Fermi pockets at the Brillouin-zone boundary. The resulting
+intermediate pairing state, which we call an orbital-selective $s \times
+\tau_3$ state, incorporates both of the above two properties. When the leading
+spin-singlet pairing is in the $d_{xz}, d_{yz}$ orbital subspace, this state
+retains the $s$-wave form factor but has a $B_{1g}$ symmetry due to an internal
+$\tau_3$ structure in the orbital space. Within a five-orbital $t-J_{1}-J_{2}$
+model with orbital-selective exchange couplings, we show that the proposed
+pairing state is energetically competitive over a finite range of control
+parameters. We calculate the dynamical spin susceptibility in the
+orbital-selective $s \times \tau_3$ superconducting state and show that a spin
+resonance arises and has the characteristics of observed by inelastic neutron
+experiments in the alkaline iron selenides. More generally, the formation of
+the orbital-selective $s \times \tau_3$ state represents a novel means of
+relieving the quasi-degeneracy between $s-$ and $d-$wave pairing states, which
+is a hitherto unsuspected alternative to the conventional route of linearly
+superposing the two into a time-reversal symmetry breaking $s+id$ state.",1505.04170v1
+2023-04-24,Strong-coupling theory of quantum dot Josephson junctions: role of the residual quasiparticle,"We consider an interacting quantum dot strongly coupled to two
+superconducting leads in a Josephson junction geometry. By defining
+symmetry-adapted superpositions of states from the leads, we formulate an
+effective Hamiltonian for the strong-hybridisation regime with a single orbital
+directly coupled to the dot and three additional indirectly coupled orbitals.
+This minimal basis set allows to account for the quasiparticles in the vicinity
+of the dot as well as those further away in the leads, and to describe how
+their role evolves as a function of coupling strength and phase bias $\phi$.
+This formulation also reveals the changing nature of the spin-doublet state for
+the experimentally relevant coupling strengths. The binding of a nearly
+decoupled quasiparticle in the vicinity of the QD explains the ""doublet
+chimney"" in the phase diagram for $\phi \sim \pi$, in contrast to $\phi \sim 0$
+where the residual quasiparticle escapes to infinity and plays no active role.",2304.12456v3
+2023-04-11,Observation of orbital pumping,"Harnessing spin and orbital angular momentum is a fundamental concept in
+condensed matter physics, materials science, and quantum-device applications.
+In particular, the search for new phenomena that generate a flow of spin
+angular momentum, a spin current, has led to the development of spintronics,
+advancing the understanding of angular momentum dynamics at the nanoscale. In
+contrast to this success, the generation and detection of orbital currents, the
+orbital counterpart of spin currents, remains a significant challenge. Here, we
+report the observation of orbital pumping, a phenomenon in which magnetization
+dynamics pumps an orbital current, a flow of orbital angular momentum. The
+orbital pumping is the orbital counterpart of the spin pumping, which is one of
+the most versatile and powerful mechanisms for spin-current generation. We show
+that the orbital pumping in Ni/Ti bilayers injects an orbital current into the
+Ti layer, which is detected through the inverse orbital Hall effect. Our
+findings provide a promising approach for generating orbital currents and pave
+the way for exploring the physics of orbital transport in solids.",2304.05266v2
+2005-10-23,Orbital magnetic field effects in spin liquid with spinon Fermi sea: Possible application to $κ$-(ET)$_2$Cu$_2$(CN)$_3$,"We consider orbital magnetic field effects in a spin liquid phase of a
+half-filled triangular lattice Hubbard system close to the Mott transition,
+continuing an earlier exploration of a state with spinon Fermi surface.
+Starting from the Hubbard model and focusing on the insulator side, we derive
+an effective spin Hamiltonian up to four-spin exchanges in the presence of
+magnetic field, and find that the magnetic field couples linearly to spin
+chirality on the triangles. The latter corresponds to a flux of an internal
+gauge field in a gauge theory description of the spin liquid, and therefore a
+static such internal flux is induced. A quantitative estimate of the effect is
+obtained using a spinon mean field analysis, where we find that this orbital
+field seen by the spinons is comparable to or even larger than the applied
+field. We further argue that because the stiffness of the emergent internal
+gauge field is very small, such a spinon-gauge system is strongly susceptible
+at low temperatures to an instability of the homogeneous state due to strong
+Landau level quantization for spinons. This instability is reminiscent of the
+so-called strong magnetic interaction regime in metals with the usual
+electromagnetic field, but we estimate that the corresponding
+temperature--magnetic field range is significantly broader in the spinon-gauge
+system.",0510615v2
+2007-10-29,Interplay of structure and spin-orbit strength in magnetism of metal-benzene sandwiches: from single molecules to infinite wires,"Based on first-principles density functional theory calculations we explore
+electronic and magnetic properties of experimentally producible sandwiches and
+infinite wires made of repeating benzene molecules and transition-metal atoms
+of V, Nb, and Ta. We describe the bonding mechanism in the molecules and in
+particular concentrate on the origin of magnetism in these structures. We find
+that all the considered systems have sizable magnetic moments and ferromagnetic
+spin-ordering, with the single exception of the V3-Bz4 molecule. By including
+the spin-orbit coupling into our calculations we determine the easy and hard
+axes of the magnetic moment, the strength of the uniaxial magnetic anisotropy
+energy (MAE), relevant for the thermal stability of magnetic orientation, and
+the change of the electronic structure with respect to the direction of the
+magnetic moment, important for spin-transport properties. While for the V-based
+compounds the values of the MAE are only of the order of 0.05-0.5 meV per metal
+atom, increasing the spin-orbit strength by substituting V with heavier Nb and
+Ta allows to achieve an increase in anisotropy values by one to two orders of
+magnitude. The rigid stability of magnetism in these compounds together with
+the strong ferromagnetic ordering makes them attractive candidates for
+spin-polarized transport applications. For a Nb-benzene infinite wire the
+occurrence of ballistic anisotropic magnetoresistance is demonstrated.",0710.5413v1
+2013-05-03,Group theoretical and topological analysis of the quantum spin Hall effect in silicene,"Silicene consists of a monolayer of silicon atoms in a buckled honeycomb
+structure. It was recently discovered that the symmetry of such a system allows
+for interesting Rashba spin-orbit effects. A perpendicular electric field is
+able to couple to the sublattice pseudospin, making it possible to electrically
+tune and close the band gap. Therefore, external electric fields may generate a
+topological phase transition from a topological insulator to a normal insulator
+(or semimetal) and vice versa. The contribution of the present article to the
+study of silicene is twofold: First, we perform a group theoretical analysis to
+systematically construct the Hamiltonian in the vicinity of the $K$ points of
+the Brillouin zone and discover a new, but symmetry allowed term. Subsequently,
+we identify a tight binding model that corresponds to the group theoretically
+derived Hamiltonian near the $K$ points. Second, we start from this tight
+binding model to analyze the topological phase diagram of silicene by an
+explicit calculation of the $Z_2$ topological invariant of the band structure.
+To this end, we calculate the $Z_2$ topological invariant of the honeycomb
+lattice in a manifestly gauge invariant way which allows us to include $S_z$
+symmetry breaking terms -- like Rashba spin orbit interaction -- into the
+topological analysis. Interestingly, we find that the interplay of two Rashba
+terms can generate a non-trivial quantum spin Hall phase in silicene. This is
+in sharp contrast to the more extensively studied honeycomb system graphene
+where Rashba spin orbit interaction is known to compete with the quantum spin
+Hall effect in a potentially detrimental way.",1305.0766v2
+2016-11-11,Rashba-Dirac cones at the tungsten surface: Insights from a tight-binding model and thin film subband structure,"A tight-binding model of bcc tungsten that includes spin-orbit coupling is
+developed and applied to the surface states of (110) tungsten thin films. The
+model describes accurately the anisotropic Dirac cone-like dispersion and
+Rashba-like spin polarization of the surface states, including the crucial
+effect of the relaxation of the surface atomic layer of the tungsten towards
+the bulk. It is shown that the surface relaxation affects the tungsten surface
+states because it results in increased overlaps between atomic orbitals of the
+surface atomic layer and nearby layers whereas electric fields that are due to
+charge transfer between the tungsten and the vacuum near the surface or between
+the bulk and surface layers do not significantly affect the Rashba-Dirac
+surface states. It is found that hybridization with bulk modes has differing
+strengths for thin film surface states belonging to the upper and lower
+Rashba-Dirac cones and results in $reversal$ of the directions of travel of
+spin $\uparrow$ and $\downarrow$ electrons in most of the upper Rashba-Dirac
+cone relative to those expected from phenomenology. It is also shown that
+intrasite (not intersite) matrix elements of the spin-orbit Hamiltonian are
+primarily responsible for the formation of the Rashba-Dirac cones, and their
+spin polarization. This finding should be considered when modeling topological
+insulators, the spin Hall effect and related phenomena.",1611.03582v1
+2017-01-24,Conductance through a helical state in an InSb nanowire,"The motion of an electron and its spin are generally not coupled. However in
+a one dimensional material with strong spin-orbit interaction (SOI) a helical
+state may emerge at finite magnetic fields, where electrons of opposite spin
+will have opposite momentum. The existence of this helical state has
+applications for spin filtering and Cooper pair splitter devices and is an
+essential ingredient for realizing topologically protected quantum computing
+using Majorana zero modes. Here we report electrical conductance measurements
+of a quantum point contact (QPC) formed in an indium antimonide nanowire as a
+function of magnetic field. At magnetic fields exceeding 3T, the $2e^2/h$
+plateau shows a reentrant conductance feature towards $1e^2/h$ which increases
+linearly in width with magnetic field before enveloping the $1e^2/h$ plateau.
+Rotating the external magnetic field either parallel or perpendicular to the
+spin-orbit field allows us to clearly attribute this experimental signature to
+SOI. We compare our observations with a model of a QPC incorporating SOI and
+extract a spin-orbit energy of ~6.5meV, which is significantly stronger than
+the SO energy obtained by other methods.",1701.06878v1
+2011-11-14,First-principle studies of the spin-orbit and the Dzyaloshinskii-Moriya interactions in the \{Cu$_3$\} single-molecule magnet,"Frustrated triangular molecule magnets such as \{Cu$_3$\} are characterized
+by two degenerate S=1/2 ground-states with opposite chirality. Recently it has
+been proposed theoretically [PRL {\bf 101}, 217201 (2008)] and verified by {\it
+ab-initio} calculations [PRB {\bf 82}, 155446 (2010)] that an external electric
+field can efficiently couple these two chiral spin states, even in the absence
+of spin-orbit interaction (SOI). The SOI is nevertheless important, since it
+introduces a splitting in the ground-state manifold via the
+Dzyaloshinskii-Moriya interaction. In this paper we present a theoretical study
+of the effect of the SOI on the chiral states within spin density functional
+theory. We employ a recently-introduced Hubbard model approach to elucidate the
+connection between the SOI and the Dzyaloshinskii-Moriya interaction. This
+allows us to express the Dzyaloshinskii-Moriya interaction constant $D$ in
+terms of the microscopic Hubbard model parameters, which we calculate from
+first-principles. The small splitting that we find for the \{Cu$_3$\} chiral
+state energies ($\Delta \approx 0.02$ meV) is consistent with experimental
+results. The Hubbard model approach adopted here also yields a better estimate
+of the isotropic exchange constant than the ones obtained by comparing total
+energies of different spin configurations. The method used here for calculating
+the DM interaction unmasks its simple fundamental origin which is the
+off-diagonal spin-orbit interaction between the generally multireference vacuum
+state and single-electron excitations out of those states.",1111.3078v1
+2016-08-20,"Hybrid excitations due to crystal-field, spin-orbit coupling and spin-waves in LiFePO$_4$","We report on the spin waves and crystal field excitations in single crystal
+LiFePO$_4$ by inelastic neutron scattering over a wide range of temperatures,
+below and above the antiferromagnetic transition of this system. In particular,
+we find extra excitations below $T_N=50$ K that are nearly dispersionless and
+are most intense around magnetic zone centers. We show that these excitations
+correspond to transitions between thermally occupied excited states of
+Fe$^{2+}$ due to splitting of the $S=2$ levels that arise from crystal field
+and spin-orbit interaction. These excitations are further amplified by the
+highly distorted nature of the oxygen octahedron surrounding the iron atoms.
+Above $T_N$, magnetic fluctuations are observed up to at least 720~K, with
+additional excitation around 4 meV, likely caused by single-ion splittings
+through spin-orbit and crystal field interactions. The latter weakens slightly
+at 720~K compared to 100~K, which is consistent with calculated cross-sections
+using a single-ion model. Our theoretical analysis, using the MF-RPA model,
+provides both detailed spectra of the Fe $d-$ shell and estimates of the
+average ordered magnetic moment and $T_N$. By applying the MF-RPA model to a
+number of existing spin-wave results from other Li$M$PO$_4$ ($M=$ Mn, Co, and
+Ni), we are able to obtain reasonable predictions for the moment sizes and
+transition temperatures.",1608.05761v1
+2017-12-10,"Tuning the Interfacial Charge, Orbital and Spin Polarization Properties in La0.67Sr0.33MnO3/ La1-xSrxMnO3 Bilayers","The possibility of controlling the interfacial properties of artificial oxide
+heterostructures is still attracting researchers in the field of materials
+engineering. Here, we used surface sensitive techniques and high-resolution
+transmission electron microscopy to investigate the evolution of the surface
+spin-polarization and lattice strains across the interfaces between
+La0.66Sr0.33MnO3 thin films and low-doped manganites as capping layers. We have
+been able to finely tune the interfacial spin-polarization by changing the
+capping layer thickness and composition. The spin-polarization was found to be
+highest at a critical capping thickness that depends on the Sr doping. We
+explain the non-trivial magnetic profile by the combined effect of two
+mechanisms. On one hand, the extra carriers supplied by the low-doped
+manganites that tend to compensate the overdoped interface, favouring locally a
+ferromagnetic double-exchange coupling. On the other hand, the evolution from a
+tensile-strained structure of the inner layers to a compressed structure at the
+surface that changes gradually the orbital occupation and hybridization of the
+3d-Mn orbitals, being detrimental for the spin polarization. The finding of an
+intrinsic spin-polarization at the A-site cation observed in XMCD measurements
+reveals also the existence of a complex magnetic configuration at the
+interface, different from the magnetic phases observed at the inner layers.",1712.03611v1
+2023-10-17,RelativisticDynamics.jl: Relativistic Spin-Orbital Dynamics in Julia,"RelativisticDynamics.jl is an open-source Julia package for relativistic
+spin-orbital dynamics in the gravitational strong-field of a Kerr spacetime.
+Existing codes for modelling the dynamics of spinning objects like pulsars in
+the strong-field regime are generally lacking, since such systems occupy an
+intermediate regime that is generally overlooked. At the ""low"" end of this
+regime there are post-Newtonian descriptions which neglect the influence of the
+pulsar spin on the underlying spacetime metric (""spin-curvature"" coupling). At
+the ""high"" end there are the full numerical relativity solutions which are
+primarily applicable toe two black holes with a mass ratio $\mathcal{O}(1)$,
+and are computationally intractable for pulsar systems observed over a large
+number of orbital cycles. RelativisticDynamics.jl aims to bridge this gap by
+providing a modern, fast code for accurate numerical evolution of spinning
+relativistic systems via the Mathisson-Papetrou-Dixon formalism. Julia is a
+modern language that solves the ""two language problem"", enabling fast dynamic
+typing and JIT compilation on conjunction with petaflop performance, comparable
+with numerical languages that are better known in the astrophysics community
+such as C or Fortran. RelativisticDynamics.jl is written to be fully type
+flexible, being able to support arbitrary number formats, and fully
+differentiable via automatic differentiation.",2310.11002v1
+2024-01-22,Gravitational spin-orbit coupling through the third-subleading post-Newtonian order: exploring spin-gauge flexibility,"We build upon recent work by Antonelli et al. [Phys. Rev. Lett. 125 (2020) 1,
+011103] to obtain, within the effective-one-body (EOB) formalism, and for an
+arbitrary choice of gauge, the third-subleading post-Newtonian (4.5PN)
+corrections to the spin-orbit conservative dynamics of spin-aligned binaries.
+This is then specialized to: (i) the well-known Damour-Jaranowski-Sch\""afer
+($\rm DJS$) gauge, where the dependence on the angular momentum of the
+gyro-gravitomagnetic functions $(G_S,G_{S_*})$ is removed and (ii) to an
+alternative gauge (called anti-$\rm DJS$ gauge, $\overline{\rm DJS}$) that is
+chosen so as to precisely reproduce the Hamiltonian of a spinning test-particle
+at linear order in the particle spin and keep the full dependence on the radial
+and angular momentum in $(G_S,G_{S_*})$. We use these results to extend by one
+perturbative order, in PN sense, the analytical knowledge of the periastron
+advance. After performing a suitable factorization and resummation of
+$(G_S,G_{S_*})$, the $\rm DJS$ and $\overline{\rm DJS}$ performances are
+compared via various gauge-invariant quantities at the EOB last stable circular
+orbit. We eventually find some indications that the $\overline{\rm DJS}$ gauge
+might be advantageous in the description of the inspiral dynamics of
+circularized binaries.",2401.12290v1
+2024-03-11,Bulk and interface spin-orbit torques in Pt/Co/MgO thin film structures,"We investigate the origin of spin-orbit torques (SOTs) in archetypical
+Pt/Co/MgO thin films structures by performing harmonic Hall measurements. The
+behaviour of the damping like (DL) effective field ($h_{DL}$) with varying the
+Pt layer thickness and the Co layer thickness indicates that bulk spin-Hall
+effect (SHE) in Pt is mainly responsible for DL-SOT. The insertion of a Pd
+ultrathin layer at the Pt/Co interface leads to a step decrease in $h_{DL}$,
+attributed to the modification of interfacial spin transparency. Further
+increase in Pd thickness led to a reduction of the interfacial spin-orbit
+coupling (iSOC) quantified by the decrease in the surface magnetic anisotropy.
+The consistent insensitivity of $h_{DL}$ to variations in iSOC at the bottom
+Pt/Co interface and oxidation at the top Co/MgO interface provides additional
+evidence for the bulk SHE origin of DL-SOT. The strong reduction in the
+field-like (FL) torque effective field ($h_{FL}$) with decreasing iSOC at the
+Pt/Co interface points to the interfacial nature of FL-SOT, either due to iSOC
+induced interfacial spin-currents or to the Rashba-Edelstein effect at the
+Pt/Co interface. Furthermore, we demonstrate that a FL-SOT develops at the top
+Co/MgO interface opposing the one generated at the bottom Pt/Co interface,
+whose strength increases with Co/MgO interfacial oxidation, and attributed to
+the Rashba-Edelstein effect.",2403.06627v1
+2012-09-05,In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3,"Topological insulators are novel macroscopic quantum-mechanical phase of
+matter, which hold promise for realizing some of the most exotic particles in
+physics as well as application towards spintronics and quantum computation. In
+all the known topological insulators, strong spin-orbit coupling is critical
+for the generation of the protected massless surface states. Consequently, a
+complete description of the Dirac state should include both the spin and
+orbital (spatial) parts of the wavefunction. For the family of materials with a
+single Dirac cone, theories and experiments agree qualitatively, showing the
+topological state has a chiral spin texture that changes handedness across the
+Dirac point (DP), but they differ quantitatively on how the spin is polarized.
+Limited existing theoretical ideas predict chiral local orbital angular
+momentum on the two sides of the DP. However, there have been neither direct
+measurements nor calculations identifying the global symmetry of the spatial
+wavefunction. Here we present the first results from angle-resolved
+photoemission experiment and first-principles calculation that both show,
+counter to current predictions, the in-plane orbital wavefunctions for the
+surface states of Bi2Se3 are asymmetric relative to the DP, switching from
+being tangential to the k-space constant energy surfaces above DP, to being
+radial to them below the DP. Because the orbital texture switch occurs exactly
+at the DP this effect should be intrinsic to the topological physics,
+constituting an essential yet missing aspect in the description of the
+topological Dirac state. Our results also indicate that the spin texture may be
+more complex than previously reported, helping to reconcile earlier conflicting
+spin resolved measurements.",1209.1016v1
+2015-06-13,Spin-orbital liquid state assisted by singlet-triplet excitation in $J~=~0$ ground state of Ba$_3$ZnIr$_2$O$_9$,"Strong spin-orbit coupling (SOC) effects of heavy $d$-orbital elements have
+long been neglected in describing the ground states of their compounds thereby
+overlooking a variety of fascinating and yet unexplored magnetic and electronic
+states, until recently. The spin-orbit entangled electrons in such compounds
+can get stabilized into unusual spin-orbit multiplet $J$-states which warrants
+severe investigations. Here we show using detailed magnetic and thermodynamic
+studies and theoretical calculations the ground state of Ba$_3$ZnIr$_2$O$_9$, a
+6$H$ hexagonal perovskite is a close realisation of the elusive $J$~=~0 state.
+However, we find that local Ir moments are spontaneously generated due to the
+comparable energy scales of the singlet-triplet splitting driven by SOC and the
+superexchange interaction mediated by strong intra-dimer hopping. While the Ir
+ions within the structural Ir$_2$O$_9$ dimer prefers to form a spin-orbit
+singlet state (SOS) with no resultant moment, substantial interdimer exchange
+interactions from a frustrated lattice ensure quantum fluctuations till the
+lowest measured temperatures and stabilize a spin-orbital liquid phase.",1506.04312v3
+1995-08-16,Spin Dynamics of Hole Doped ${\rm Y_{2-x} Ca_x Ba Ni O_5}$,"We propose an electronic model for the recently discovered hole doped
+compound ${\rm Y_{2-x} Ca_x Ba Ni O_5 }$. From a multiband Hamiltonian with
+oxygen and nickel orbitals, a one band model is derived. Holes are described
+using Zhang-Rice-like S=1/2 states at the nickels propagating on a S=1 spin
+chain. Using numerical techniques to calculate the dynamical spin structure
+factor ${\rm S(q,\omega)}$ in a realistic regime of couplings, spectral weight
+in the Haldane gap is observed in agreement with neutron scattering data. Low
+energy states with S=3/2 appear in the model. Several predictions are made to
+test these ideas.",9508061v1
+1998-02-26,Identification of Non-unitary triplet pairing in a heavy Fermion superconductor UPt_3,"A NMR experiment recently done by Tou et al. on a heavy Fermion
+superconductor UPt$_3$ is interpreted in terms of a non-unitary spin-triplet
+pairing state which we have been advocating. The proposed state successfully
+explains various aspects of the seemingly complicated Knight shift behaviors
+probed for major orientations, including a remarkable d-vector rotation under
+weak fields. This entitles UPt$_3$ as the first example that a charged many
+body system forms a spin-triplet odd-par ity pairing at low temperatures and
+demonstrates unambiguously that the putative spin-orbit coupling in UPt$_3$ is
+weak.",9802280v1
+1998-07-02,Pairing due to Spin Fluctuations in Layered Organic Superconductors,"I show that for a \kappa-type organic (BEDT-TTF)_2-X molecular crystal, a
+superconducting state with T_c ~ 10 K and gap nodes on the Fermi surface can be
+caused by short-ranged antiferromagnetic spin fluctuations. Using a two-band
+description for the anti-bonding orbitals on a BEDT-TTF dimer of the
+\kappa-type salt, and an intermediate local Coulomb repulsion between two holes
+on one dimer, the magnetic interaction and the superconducting gap-function are
+determined self consistently within the fluctuation exchange approximation. The
+pairing interaction is predominantly caused by inter-band coupling and
+additionally affected by spin excitations of the quasi one-dimensional band.",9807042v1
+2000-10-14,d-Wave Superconductivity Induced by Chern-Simons Term in High-$T_c$ Cuprates,"We show that a Chern-Simons term for a gauge field describing a fluctuation
+of spins is induced by integrating out hole fields in the presence of
+spin-orbit coupling which originates from a buckling of the CuO$_2$ plane.
+Through the Chern-Simons term, holes behave like skyrmion excitations in a spin
+system and become a superconducting state with $d_{x^2-y^2}$ symmetry after the
+antiferromagnetic long-range order is destroyed.",0010199v3
+2001-09-10,ESR theory for interacting 1D quantum wires,"We compute the electron spin resonance (ESR) intensity for one-dimensional
+quantum wires in semiconductor heterostructures, taking into account
+electron-electron interactions and spin-orbit coupling. The ESR spectrum is
+shown to be very sensitive to interactions. While in the absence of
+interactions, the spectrum is a flat band, characteristic threshold
+singularities appear in the interacting limit. This suggests the practical use
+of ESR to reveal spin dynamics in a Luttinger liquid.",0109161v1
+2002-06-22,Measurements of strongly-anisotropic g-factors for spins in single quantum states,"We have measured the full angular dependence, as a function of the direction
+of magnetic field, for the Zeeman splitting of individual energy states in
+copper nanoparticles. The g-factors for spin splitting are highly anisotropic,
+with angular variations as large as a factor of five. The angular dependence
+fits well to ellipsoids. Both the principal-axis directions and g-factor
+magnitudes vary between different energy levels within one nanoparticle. The
+variations agree quantitatively with random-matrix theory predictions which
+incorporate spin-orbit coupling.",0206423v1
+2005-10-02,Giant Magneto-Oscillations of Electric-Field-Induced Spin Polarization in 2DEG,"We consider a disordered two-dimensional electron gas with spin-orbit
+coupling placed in a perpendicular magnetic field and calculate the magnitude
+and direction of the electric-field-induced spin polarization. We find that in
+strong magnetic fields the polarization becomes an oscillatory function of the
+magnetic field and that the amplitude of these oscillations is parametrically
+larger than the polarization at zero magnetic field. We show that the enhanced
+amplitude of the polarization is a consequence of strong electron-hole
+asymmetry in a quantizing magnetic field.",0510024v1
+2005-11-22,Effect of Coulomb interaction on the spin-galvanic mode in a two dimensional electron gas with Rashba spin-orbit interaction,"Recently a new propagating mode of coupled charge and spin oscillations was
+predicted in a two dimensional electron gas with a sufficiently strong Rashba
+interaction. We show that Coulomb interactions qualitatively modifies the
+spectrum and increases the characteristic wavelength of this mode by orders of
+magnitude, but does not suppress it. An absorption experiment that can
+conclusively detect the presence or absence of such a propagating mode is
+proposed.",0511534v1
+2006-03-31,Geometrical spin dephasing in quantum dots,"We study spin-orbit mediated relaxation and dephasing of electron spins in
+quantum dots. We show that higher order contributions provide a relaxation
+mechanism that dominates for low magnetic fields and is of geometrical origin.
+In the low-field limit relaxation is dominated by coupling to electron-hole
+excitations and possibly $1/f$ noise rather than phonons.",0603847v2
+2006-07-24,Kondo Quantum Dots and the Novel Kondo-doublet interaction,"We analyze the interactions between two Kondo Quantum Dots connected to a
+Rashba-active Quantum Wire. We find that the Kondo-doublet interaction, at an
+inter-dot distance of the order of the wire Fermi length, is over an order of
+magnitude greater than the RKKY interaction. The effects induced on the
+Kondo-doublet interaction by the wire spin-orbit coupling can be used to
+control the Quantum Dots spin-spin correlation. These results imply that the
+widely used assumption that the RKKY is the dominant interaction between
+Anderson impurities must be revised.",0607620v2
+2006-10-16,Exchange-controlled single-electron-spin rotations in quantum dots,"We show theoretically that arbitrary coherent rotations can be performed
+quickly (with a gating time ~1 ns) and with high fidelity on the spin of a
+single confined electron using control of exchange only, without the need for
+spin-orbit coupling or ac fields. We expect that implementations of this scheme
+would achieve gate error rates on the order of \eta ~ 10^{-3} in GaAs quantum
+dots, within reach of several known error-correction protocols",0610443v2
+2004-05-12,Studies of Er ionization energy,"This work is aimed at the multiconfigurational Hartree-Fock calculations of
+the Er ionization energy. Authors have used the ATSP MCHF version in which
+there are new codes for calculation of spin-angular parts written on the basis
+of the methodology Gaigalas, Rudzikas and Froese Fischer, based on the second
+quantization in coupled tensorial form, the angular momentum theory in 3 spaces
+(orbital, spin and quasispin) and graphical technique of spin-angular
+ntegrations. They allow the study of configurations with open f-shells without
+any restrictions and lead to fairly accurate values of spectroscopic data.",0405054v1
+2008-04-10,Spin-triplet p-wave pairing in a 3-orbital model for iron pnictide superconductors,"We examine the possibility that the superconductivity in the newly discovered
+FeAs materials may be caused by the Coulomb interaction between d-electrons of
+the iron atoms. We find that when the Hund's rule ferromagnetic interaction is
+strong enough, the leading pairing instability is in spin-triplet p-wave
+channel in the weak coupling limit. The resulting superconducting gap has nodal
+lines on the 3D Fermi surfaces. The k dependent hybridization of several
+orbitals around a Fermi pocket is the key for the appearance of the
+spin-triplet p-wave pairing.",0804.1739v3
+2008-08-09,Gilbert Damping in Conducting Ferromagnets I: Kohn-Sham Theory and Atomic-Scale Inhomogeneity,"We derive an approximate expression for the Gilbert damping coefficient
+\alpha_G of itinerant electron ferromagnets which is based on their description
+in terms of spin-density-functional-theory (SDFT) and Kohn-Sham quasiparticle
+orbitals. We argue for an expression in which the coupling of magnetization
+fluctuations to particle-hole transitions is weighted by the spin-dependent
+part of the theory's exchange-correlation potential, a quantity which has large
+spatial variations on an atomic length scale. Our SDFT result for \alpha_G is
+closely related to the previously proposed spin-torque correlation-function
+expression.",0808.1373v1
+2008-08-11,Anomalous Josephson Current in Junctions with Spin-Polarizing Quantum Point Contacts,"We consider a ballistic Josephson junction with a quantum point contact in a
+two-dimensional electron gas with Rashba spin-orbit coupling. The point contact
+acts as a spin filter when embedded in a circuit with normal electrodes. We
+show that with an in-plane external magnetic field an anomalous supercurrent
+appears even for zero phase difference between the superconducting electrodes.
+In addition, the external field induces large critical current asymmetries
+between the two flow directions, leading to supercurrent rectifying effects.",0808.1516v1
+2008-09-03,Aharonov-Casher Effect in Wigner Crystal Exchange Interactions,"We theoretically study the effects of spin-orbit coupling on spin exchange in
+a low-density Wigner crystal. In addition to the familiar antiferromagnetic
+Heisenberg exchange, we find general anisotropic interactions in spin space if
+the exchange paths allowed by the crystal structure form loops in real space.
+In particular, it is shown that the two-electron exchange interaction can
+acquire ferromagnetic character.",0809.0598v2
+2009-07-15,Proposal for Creating a Spin-polarized p_x+ip_y State and Majorana Fermions,"The spin polarized p_x + ip_y superconductor is known to support Majorana
+states but so far there has been no example. We propose a simple setup to
+create such a state by depositing a ferromagnetic metal on a
+non-centrosymmetric superconductor with strong spin-orbit coupling which
+contains a Rashba-type term.",0907.2681v2
+2009-07-21,Vortex Tiling in a Spin-2 Spinor Bose-Einstein Condensate,"We point out that the internal spin symmetry of the order parameter manifests
+itself at the core of a fractional vortex in real space without spin-orbit
+coupling. Such symmetry breaking arises from a topological constraint and the
+commensurability between spin symmetries of the order parameters inside and
+outside the core. Our prediction can be applied to probe the cyclic order
+parameter in a rotating spin-2 $^{87}$Rb condensate as a non-circular vortex
+core in a biaxial nematic state.",0907.3716v2
+2009-11-22,Spin state transition in LaCoO3 by variational cluster approximation,"The variational cluster approximation is applied to the calculation of
+thermodynamical quantities and single-particle spectra of LaCoO3. Trial
+self-energies and the numerical value of the Luttinger-Ward functional are
+obtained by exact diagonalization of a CoO6 cluster. The VCA correctly predicts
+LaCoO3 as a paramagnetic insulator and a gradual and relatively smooth increase
+of the occupation of high-spin Co3+ ions causes the temperature dependence of
+entropy and magnetic susceptibility. The single particle spectral function
+agrees well with experiment, the experimentally observed temperature dependence
+of photoelectron spectra is reproduced satisfactorily. Remaining discrepancies
+with experiment highlight the importance of spin orbit coupling and local
+lattice relaxation.",0911.4236v1
+2010-11-09,Surface density of states and topological edge states in non-centrosymmetric superconductors,"We study Andreev bound state (ABS) and surface density of state (SDOS) of
+non-centrosymmetric superconductor where spin-singlet $d$-wave pairing mixes
+with spin-triplet $p$ (or $f)$-wave one by spin-orbit coupling. For $d_{xy} +
+p$-wave pairing, ABS appears as a zero energy state. The present ABS is a
+Majorana edge mode preserving the time reversal symmetry. We calculate
+topological invariant number and discuss the relevance to a single Majorana
+edge mode. In the presence of the Majorana edge mode, the SDOS depends strongly
+on the direction of the Zeeman field.",1011.2002v1
+2011-12-13,Spectral properties of one-dimensional spiral spin density wave states,"We provide a full characterization of the spectral properties of spiral spin
+density wave (SSDW) states which emerge in one-dimensional electron systems
+coupled to localized magnetic moments or quantum wires with spin-orbit
+interactions. We derive analytic results for the spectral function, local
+density of states and optical conductivity in the low-energy limit by using
+field theory techniques. We identify various collective modes and show that the
+spectrum strongly depends on the interaction strength between the electrons.
+The results provide characteristic signatures for an experimental detection of
+SSDW states.",1112.3045v2
+2012-03-13,Monopoles in ferromagnetic metals,"The aim of this short review is to give an introduction to monopoles and to
+present theoretical derivation of two particular monopoles in ferromagnetic
+metals, a hedgehog monopole and a spin damping monopole. Spin damping monopoles
+can be generated in simple systems such as a junction of a ferromagnet and a
+heavy element with strong spin-orbit interaction such as Pt. This monopole is
+essential in coupling electronics with magnetism, and is thus expected to play
+an essential role in spintronics.",1203.2709v1
+2012-09-23,On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3,"We explore the phase diagram of spin-orbit Mott insulators on a honeycomb
+lattice, within the Kitaev-Heisenberg model extended to its full parameter
+space. Zigzag-type magnetic order is found to occupy a large part of the phase
+diagram of the model, and its physical origin is explained as due to
+interorbital t2g-eg hopping. Magnetic susceptibility and spin wave spectra are
+calculated and compared to the experimental data, obtaining thereby the spin
+coupling constants in Na2IrO3 and Li2IrO3.",1209.5100v1
+2012-12-08,Relativistic symmetries in the Hulthén scalar-vector-tensor interactions,"In the presence of spin and pseudospin (p-spin) symmetries, the approximate
+analytical bound states of the Dirac equation for scalar-vector-tensor
+Hulth\'en potentials are obtained with any arbitrary spin-orbit coupling number
+using the Pekeris approximation. The Hulth\'en tensor interaction is studied
+instead of the commonly used Coulomb or linear terms. The generalized
+parametric Nikiforov-Uvarov (NU) method is used to obtain energy eigenvalues
+and corresponding wave functions in their closed forms. We show that tensor
+interaction removes degeneracies between spin and p-spin doublets. Some
+numerical results are also given.",1212.1828v1
+2012-12-13,Fast adiabatic-like spin manipulation in a two-electron double quantum dot,"We apply the transitionless quantum driving method to control the electron
+spin of a two-electron double quantum dot with spin-orbit coupling by
+time-dependent electric fields. The $x$ and $y$ components of applied electric
+fields in each dot are designed to achieve fast adiabatic-like passage in the
+nanosecond timescale. To simplify the setup, we can further transform
+Hamiltonian by z axis to design an alternative speed-up adiabatic passage,
+without using the applied electric field in $y$ direction.",1212.3294v1
+2013-05-08,Point contacts and localization in generic helical liquids,"We consider two helical liquids on opposite edges of a narrow two-dimensional
+topological insulator, which are connected by one or several local tunnel
+junctions. In the presence of spatially inhomogeneous Rashba spin-orbit
+coupling, the spin textures of the helical states on opposite edges are
+different. We demonstrate that this has a strong impact on the electron
+transport between the edges. In particular, in the case of many random tunnel
+contacts, the localization length depends strongly on the spin textures of the
+edge states.",1305.1875v2
+2013-05-21,Switching of a single ferromagnetic layer driven by spin Hall effect,"The magnetization switching of a thin ferromagnetic layer placed on top of a
+heavy metal (such as Pt, Ta or W) driven by an in-plane current has been
+observed in recent experiments. The magnetization dynamics of these processes
+is studied in a full micromagnetic framework which takes into account the
+transfer-torque from spin Hall effect due to the spin-orbit coupling.
+Simulations indicate that the reversal occurs via nucleation of complex
+magnetization patterns. In particular, magnetic bubbles appear during the
+reversal of the magnetization in the perpendicular configuration while for the
+in-plane configuration, nucleation of vortexes are observed.",1305.4806v1
+2013-11-27,Statistics of Spin Fluctuations in Quantum Dots with Ising Exchange,"We explore the effect of single-particle level fluctuations on the Stoner
+instability in a QD with a strong spin-orbit coupling in the framework of the
+universal Hamiltonian with the Ising exchange interaction. We reduce the
+problem to studying the statistics of extrema of a certain Gaussian process and
+demonstrate that, in spite of the randomness of the single-particle levels, the
+longitudinal spin susceptibility and all its moments diverge simultaneously at
+the point of the Stoner instability which is determined by the standard
+criterion involving the mean level spacing only.",1311.7083v2
+2014-08-19,Spinning test particles in Weyl spacetimes,"The motion of spinning test particles along circular orbits in static vacuum
+spacetimes belonging to the Weyl class is discussed. Spin alignment and
+coupling with background parameters in the case of superimposed Weyl fields,
+corresponding to a single Schwarzschild black hole and single Chazy-Curzon
+particle as well as to two Schwarzschild black holes and two Chazy-Curzon
+particles, are studied in detail for standard choices of supplementary
+conditions. Applications to the gravitomagnetic ""clock effect"" are also
+discussed.",1408.4273v1
+2016-06-10,Chirality in photonic systems,"The optical modes of photonic structures are the so-called TE and TM modes
+which bring intrinsic spin-orbit coupling and chirality to these systems. This,
+combined with the unique flexibility of design of the photonic potential, and
+the possibility to mix photon states with excitonic resonances, sensitive to
+magnetic field and interactions, allows to achieve many phenomena, often
+analogous to other solid state systems. In this contribution, we review in a
+qualitative and comprehensive way several of these realizations, namely the
+optical spin Hall effect, the creation of spin currents protected by a
+non-trivial geometry, Berry curvature for photons, and the photonic/polaritonic
+topological insulator.",1606.03311v1
+2017-08-01,Photo-spin voltaic effect and photo-magnetoresistance in proximized platinum,"Spin orbit coupling in heavy metals allows conversion of unpolarized light
+into an open-circuit voltage. We experimentally prove that this photo-spin
+voltaic effect is due to photo-excitation of carriers in the proximized layer
+and can exist for light in the visible range. While carrying out the
+experiment, we discovered that, in closed-circuit conditions, the anisotropic
+magnetoresistance of the proximized metal is a function of the light intensity.
+We name this effect photo-magnetoresistance. A magneto-transport model is
+presented that describes the change of magnetoresistance as a function of the
+light intensity.",1708.04130v2
+2018-04-18,Electronic states and persistent currents in nanowire quantum ring,"The new model of a quantum ring (QR) defined inside a nanowire (NW) is
+proposed. The one-particle Hamiltonian for electron in [111]-oriented NW QR is
+constructed taking into account both Rashba and Dresselhaus spin-orbit coupling
+(SOC). The energy levels as a function of magnetic field are found using the
+exact numerical diagonalization. The persistent currents (both charge and spin)
+are calculated. The specificity of SOC and arising anticrossings in energy
+spectrum lead to unusual features in persistent current behavior. The variation
+of magnetic field or carrier concentration by means of gate can lead to pure
+spin persistent current with the charge current being zero.",1804.06629v1
+2014-03-27,Hyperfine Clock Transitions of Bismuth Donors in Silicon Detected by Spin Dependent Recombination,"Bismuth donors ion-implanted in $^{28}$Si and $^\text{nat}$Si are studied
+using magnetic resonance spectroscopy based on spin dependent recombination.
+The hyperfine clock transition, at which the linewidth is significantly
+narrowed, is observed for the bismuth donors. The experimental results are
+modeled quantitatively by molecular orbital theory for a coupled pair
+consisting of a bismuth donor and a spin dependent recombination readout
+center, including the effect of hyperfine and Zeeman interactions.",1403.6935v2
+2012-01-04,Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets,"Motivated by recent experimental studies of thin-film devices containing a
+single ferromagnetic layer, we develop a quantum kinetic theory of
+current-induced magnetic torques in Rashba-model ferromagnets. We find that
+current-induced spin-densities that are responsible for the switching behavior
+are due most essentially to spin-dependent quasiparticle lifetimes and derive
+analytic expressions for relevant limits of a simple model. Quantitative model
+parameter estimates suggest that spin-orbit coupling in the adjacent metal
+normal magnetic layer plays an essential role in the strength of the switching
+effect.",1201.0990v1
+2017-06-01,Electronic and magnetic properties of low dimensional system Co2TeO3Cl2,"The electronic and magnetic properties of transition metal oxyhalide compound
+Co2TeO3Cl2 is investigated using first principle calculations within the
+framework of density functional theory. In order to find underlying spin
+lattice of this compound, various hopping integrals and exchange interactions
+are calculated. The calculations reveal that the dominant inter-chain and
+intra-chain interactions are in ab plane. The exchange path is visualised by
+Wannier function plotting. The nearest neighbour and next nearest neighbour
+exchange interactions are antiferromagnetic, making the system frustrated in
+low dimension. The importance of spin orbit coupling in this compound is also
+investigated. The spin quantization axis is favoured along the crystallographic
+b direction.",1706.00259v1
+2000-06-16,Local off-cubic distortion the cause for the low- and high-spin states of the Co3+ ion,"It is pointed out that it is the local symmetry that determines the
+realization of the low- and high-spin state of the Co3+ ion. We can rigorously
+prove it treating the Co3+ ion as the highly-correlated electron system 3d6,
+that fulfiles the Hund's rules with taking into account the spin-orbit
+coupling. As the function of the sign of the off-cubic crystal-field distortion
+the magnetic or non-magnetic state is realized.",0006269v1
+2012-05-07,Electron Number Dependence of Spin Triplet-Singlet Relaxation Time,"In a GaAs single quantum dot, the relaxation time T_{1} between spin triplet
+and singlet states has been measured for the last few even number of electrons.
+The singlet-triplet energy separation E_{ST} is tuned as a control parameter
+for the comparison of T_{1} between different electron numbers. T_{1} shows a
+steady decrease from 2-electrons, 4-electrons, to 6-electrons, and we found
+this implies an enhancement of the spin-orbital coupling strength in a
+multi-electron quantum dot.",1205.1264v1
+2017-05-10,Low-Error Operation of Spin Qubits with Superexchange Coupling,"In this theoretical work we investigate superexchange, as a means of indirect
+exchange interaction between two single electron spin qubits, each embedded in
+a single semiconductor quantum dot (QD). The exchange interaction is mediated
+by an intermediate, empty QD. Our findings suggest the existence of first order
+""super sweet spots"", in which the qubit operations implemented by superexchange
+interaction are simultaneously insensitive to charge noise and errors due to
+spin-orbit interaction. We also find that the sign of the superexchange can be
+changed by varying the energy detunings between the QDs.",1705.03702v1
+2018-06-20,Configuration Interaction Singles with Spin-Orbit Coupling: Constructing Spin-Adiabatic States and Their Analytical Nuclear Gradients,"For future use in modeling photoexcited dynamics and intersystem crossing, we
+calculate spin-adiabatic states and their analytical nuclear gradients within
+CIS the- ory. These energies and forces should be immediately useful for
+surface hopping dynamics, which are natural within an adiabatic framework. The
+resulting code has been implemented within the Q-Chem software and preliminary
+results suggest that the additional cost of including SOC within the
+singles-singles block is not large.",1806.07835v1
+2018-07-07,Fully Spin-Polarized Current in Gated Bilayer Silicene,"By applying density functional theory calculations, we predict that the
+groundstate of bilayer silicene at certain interlayer distances can be
+antiferromagnetic. At small electron or hole doping, it becomes half metallic
+under applied out-of-plane electric field, which can be used to produce fully
+spin-polarized field-effect-driven current even in the absence of external
+magnetic field, ferromagnetic substrates, doped magnetic ions, or spin-orbital
+coupling. Our finding points out a new route to overcome the major challenge of
+spintronics.",1807.02663v1
+2019-02-07,s+if pairing in Ising superconductors,"We show that an in-plane Zeeman field applied to non-centrosymmetric Ising
+superconductors converts singlet $s$-wave Cooper pairs to equal-spin triplet
+$if$ pairs, leading to an enhancement of the critical transition line beyond
+expected from Ising spin-orbit coupling. Singlet to triplet conversion relates
+to a phase transformation due to spin rotation by the Zeeman field and has a
+geometric origin. The discussion is especially relevant, but not limited to
+monolayer transition metal dichalcogenides.",1902.02577v1
+2019-04-26,Anti-Localization in Oxides: Effective Spin-3/2 Model,"Weak anti-localization offers an experimental tool to address spin--orbit
+coupling of two-dimensional oxide surfaces and interfaces via
+magneto-transport. To overcome the shortcomings of the formulation for
+single-band spin-1/2 electrons, we consider an effective three-band model that
+allows a decomposition into a pseudo-spin representation 1/2+3/2. Whereas the
+well-established spin-1/2 transport signature results from the singlet and
+triplet sectors in the Cooperon equation, a new structure originates from the
+quintet and septet sectors generated by the spin 3/2x3/2 representation.",1904.11770v1
+2019-11-14,Zero field splitting of heavy-hole states in quantum dots,"Using inelastic cotunneling spectroscopy, we observe a 55{\mu}eV zero field
+splitting in the spin triplet manifold of Ge hut wire quantum dots. The
+degeneracy of the heavy hole triplet state is lifted since the interplay of
+strong spin orbit coupling and strong confinement leads to a preferred
+direction of the heavy-hole pseudospin. The reported effect should be
+observable in a broad class of strongly confined hole quantum-dot systems and
+needs to be considered when operating hole spin qubits.",1911.06418v2
+2016-12-04,Spin- and velocity-dependent non-relativistic potentials in modified electrodynamics,"We investigate the interparticle potential between spin-0, -1/2 and -1
+sources interacting in modified electrodynamics in the non-relativistic regime.
+By keeping terms of $\mathcal{O}( |{\bf p}|^2/m^2 )$ in the amplitudes, we
+obtain spin- and velocity-dependent interaction energies. We find well-known
+effects such as spin-orbit couplings, as well as spin-spin (dipole-dipole)
+interactions. For concreteness, we consider the cases of electrodynamics with
+higher derivatives (Podolsky-Lee-Wick) and hidden photons.",1612.01181v1
+2017-11-10,Chiral solitons in a non-linear model of helical molecules,"In this paper an effective integrable non-linear model describing the
+electron spin dynamics in a deformable helical molecule with weak spin-orbit
+coupling is presented. Non-linearity arises from the electron-lattice
+interaction and it enables the formation of a variety of stable solitons such
+as bright solitons, breathers and rogue waves, all of them presenting well
+defined spin projection onto the molecule axis. A thorough study of the soliton
+solutions is presented and discussed.",1711.03794v1
+2021-05-27,"Curvature-induced long ranged supercurrents in diffusive SFS Josephson Junctions, with dynamic $0-π$ transition","We report that spin supercurrents can be induced in diffusive SFS Josephson
+junctions without any magnetic misalignment or intrinsic spin orbit coupling.
+Instead, the pathway to spin triplet generation is provided via geometric
+curvature, and results in a long ranged Josephson effect. In addition, the
+curvature is shown to induce a dynamically tunable $0-\pi$ transition in the
+junction. We provide the analytic framework and discuss potential experimental
+and innovation implications.",2105.13372v2
+2021-07-08,Antiskyrmions and Bloch Skyrmions in Magnetic Dresselhaus Metals,"We present a microscopic electronic description of how antiskyrmions can be
+stabilized in a Dresselhaus spin-orbit coupled magnetic metal. Furthermore, we
+show that the antiskyrmions can be tuned into Bloch skyrmions via a change in
+sign of hopping integral. The results are based on the state of the art hybrid
+Monte Carlo simulations. Origin of such topological textures is understood via
+an effective spin-only model. Our results uncover a novel connection between
+two very distinct topological spin textures of immense current interest, and
+present a microscopic explanation of skyrmion formation reported recently in
+certain magnetic Weyl semimetals.",2107.03820v1
+2023-07-28,Berezinskii approach to disordered spin systems with asymmetric scattering and application to the quantum boomerang effect,"We extend the Berezinskii diagrammatic technique to one-dimensional
+disordered spin systems, in which time-reversal invariance is broken due to a
+spin-orbit coupling term inducing left-right asymmetric scattering. We then use
+this formalism to theoretically describe the dynamics of the quantum boomerang
+effect, a recently discovered manifestation of Anderson localization. The
+theoretical results are confirmed by exact numerical simulations of wave-packet
+dynamics in a random potential.",2307.15354v1
+2023-08-07,Half-quantum flux in spin-triplet superconducting rings with bias current,"Effects of a bias electric current have been theoretically investigated in a
+spin-triplet superconducting ring in a magnetic field. Based on the
+Ginzburg-Landau theory, we show that the bias current can stabilize a
+half-quantum-flux (HQF) state via couplings to the Zeeman field and the
+dipole-type spin-orbit interaction, the latter becoming active when the field
+is tilted from the ring axis. The emergence of the HQF state is reflected as a
+field-induced half-quantum-shift in the Little-Parks (LP) oscillation in the
+critical current. Possible relevance to recent LP experiments is also
+discussed.",2308.03668v1
+2022-03-23,"Relativistic and QED corrections to one-bond indirect nulcear spin-spin couplings in X$_2^{2+}$ and X$_3^{2+}$ ions (X = Zn, Cd, Hg)","The indirect nuclear spin-spin coupling tensor, $\mathbf J$, between mercury
+nuclei in Hg-containing systems can be of the order of few kHz and one of the
+largest measured. We conduct an analysis of the physics behind the electronic
+mechanisms that contribute to the one- and two-bond couplings $^n {\mathbf
+J}_{\mathrm{Hg}-\mathrm{Hg}}$ ($n=1, 2$). We performed calculations for
+$J$-couplings in X$_2^{2+}$ and $X_3^{2+}$ ions ($X$ = Zn, Cd, Hg), within
+polarization propagator theory, using the random phase approximation (RPA) and
+the pure zeroth order approximation (PZOA), with Dirac-Hartree-Fock (DHF) and
+Dirac-Kohn-Sham (DKS) orbitals, both at four-component and ZORA levels. We show
+that the ""paramagnetic-like"" mechanism contribute with more than 99.98\% to the
+total isotropic component of the coupling tensor. By means of an analysis of
+the molecular and atomic orbitals involved in the total value of the response
+function, we find that the $s$-type valence atomic orbitals have a predominant
+role in the description of the coupling. This fact allows us to develop an
+effective model from which quantum electrodynamics (QED) effects on
+$J$-coupling in the aforementioned ions can be estimated. The estimated QED
+corrections were found in the interval $(0.7; ~ 1.7)$\% of the total
+relativistic effect on isotropic one-bond $^1 {\mathbf J}$ coupling and from
+the interval $(-0.2; ~ -0.4)$\%, in Zn-containing ions, to $(-0.8; ~ -1.2)$\%,
+in Hg-containing ions, of the total isotropic coupling constant in the studied
+systems. We also show that estimated QED corrections cast a visible dependence
+on the nuclear charge $Z$ of each atom $X$ in the form of a power-law $\propto
+Z^5$.",2203.12356v1
+2023-11-06,Quantification of spin-charge interconversion in highly resistive sputtered Bi$_x$Se$_{1-x}$ with non-local spin valves,"The development of spin-orbitronic devices, such as magneto-electric
+spin-orbit logic devices, calls for materials with a high resistivity and a
+high spin-charge interconversion efficiency. One of the most promising
+candidates in this regard is sputtered Bi$_x$Se$_{1-x}$. Although there are
+several techniques to quantify spin-charge interconversion, to date reported
+values for sputtered Bi$_x$Se$_{1-x}$ have often been overestimated due to
+spurious effects related to local currents combined with a lack of
+understanding of the effect of the interfaces and the use of approximations for
+unknown parameters, such as the spin diffusion length. In the present study,
+non-local spin valves are used to inject pure spin currents into
+Bi$_x$Se$_{1-x}$, allowing us to directly obtain its spin diffusion length as
+well as its spin Hall angle, from 10 K up to 300 K. These values, which are
+more accurate than those previously reported in sputtered Bi$_x$Se$_{1-x}$,
+evidence that the efficiency of this material is not exceptional. Indeed, the
+figure of merit for spin-charge interconversion, given by the product of these
+two parameters, is slightly under 1 nm. Our work demonstrates the importance of
+considering all material parameters and interfaces when quantifying the spin
+transport properties of materials with strong spin-orbit coupling.",2311.03598v1
+2017-01-10,Effective lattice model for collective modes in a Fermi liquid with spin-orbit coupling,"A Fermi-liquid (FL) with spin-orbit coupling (SOC) supports a special type of
+collective modes--chiral spin waves--which are oscillations of magnetization
+even in the absence of the external magnetic field. We study the chiral spin
+waves of a two-dimensional FL in the presence of both the Rashba and
+Dresselhaus types of SOC and also subject to the in-plane magnetic field. We
+map the system of coupled kinetic equations for the angular harmonics of the
+occupation number onto an effective one-dimensional tight-binding model, in
+which the lattice sites correspond to angular-momentum channels.
+Linear-in-momentum SOC ensures that the effective tight-binding model has only
+nearest-neighbor hopping on a bipartite lattice. In this language, the
+continuum of spin-flip particle-hole excitations becomes a conduction band of
+the lattice model, whereas electron-electron interaction, parameterized by the
+harmonics of the Landau function, is mapped onto lattice defects of both
+on-site and bond type. Collective modes correspond to bound states formed by
+such defects. All the features of the collective-mode spectrum receive natural
+explanation in the lattice picture as resulting from the competition between
+on-site and bond defects.",1701.02781v3
+2017-04-11,Synergetic effect of spin-orbit coupling and Zeeman splitting on the optical conductivity in the one-dimensional Hubbard model,"We study how the synergetic effect of spin-orbit coupling (SOC) and Zeeman
+splitting (ZS) affects the optical conductivity in the one-dimensional Hubbard
+model using the Kubo formula. We focus on two phenomena: (1) the electric
+dipole spin resonance (EDSR) in the metallic regime and (2) the optical
+conductivity in the Mott-insulating phase above the optical gap. In both cases,
+we calculate qualitatively the effects of SOC and ZS and how they depend on the
+relative angle between the SOC vector and the magnetic field direction. First,
+we investigate the spin resonance without electron correlation (the Hubbard
+parameter $U=0$). Although, neither SOC nor ZS causes any resonance by itself
+in the optical conductivity, the EDSR becomes possible when both of them exist.
+The resulting contribution to the optical conductivity is analyzed
+analytically. The effect of $U$ on the spin resonance is also studied with a
+numerical method. It is found that at half-filling, the resonance is first
+enhanced for small $U$ and then suppressed when the optical gap is large
+enough. In the strong coupling limit $U \rightarrow \infty$ at half-filling, we
+also refer to the resonance between the lower and upper Hubbard bands appearing
+at $\omega \sim U$, above the optical gap. A large magnetic field tends to
+suppress the signal while it is recovered thanks to SOC depending on the
+relative angle of the magnetic field.",1704.03153v2
+2020-11-30,Kitaev interactions in the Co honeycomb antiferromagnets Na$_3$Co$_2$SbO$_6$ and Na$_2$Co$_2$TeO$_6$,"Co$^{2+}$ ions in an octahedral crystal field, stabilise a j$_{eff}$ = 1/2
+ground state with an orbital degree of freedom and have been recently put
+forward for realising Kitaev interactions, a prediction we have tested by
+investigating spin dynamics in two cobalt honeycomb lattice compounds,
+Na$_2$Co$_2$TeO$_6$ and Na$_3$Co$_2$SbO$_6$, using inelastic neutron
+scattering. We used linear spin wave theory to show that the magnetic spectra
+can be reproduced with a spin Hamiltonian including a dominant Kitaev
+nearest-neighbour interaction, weaker Heisenberg interactions up to the third
+neighbour and bond-dependent off-diagonal exchange interactions. Beyond the
+Kitaev interaction that alone would induce a quantum spin liquid state, the
+presence of these additional couplings is responsible for the zigzag-type
+long-range magnetic ordering observed at low temperature in both compounds.
+These results provide evidence for the realization of Kitaev-type coupling in
+cobalt-based materials, despite hosting a weaker spin-orbit coupling than their
+4d and 5d counterparts.",2012.00006v3
+2019-04-23,"$k \cdot p$ theory for phosphorene: Effective g-factors, Landau levels, and excitons","Phosphorene, a single layer of black phosphorus, is a direct-band gap
+two-dimensional semiconductor with promising charge and spin transport
+properties. The electronic band structure of phosphorene is strongly affected
+by the structural anisotropy of the underlying crystal lattice. We describe the
+relevant conduction and valence bands close to the $\Gamma$ point by four- and
+six-band (with spin) $k \cdot p$ models, including the previously overlooked
+interband spin-orbit coupling which is essential for studying anisotropic
+crystals. All the $k \cdot p$ parameters are obtained by a robust fit to {\it
+ab initio} data, by taking into account the nominal band structure and the
+$k$-dependence of the effective mass close to $\Gamma$-point. The inclusion of
+interband spin-orbit coupling allows us to determine dipole transitions along
+both armchair and zigzag directions. The interband coupling is also key to
+determine the effective g-factors and Zeeman splittings of the Landau levels.
+We predict the electron and hole g-factor correction of $\approx 0.03$ due to
+the intrinsic contributions in phosphorene, which lies within the existing
+range of experimental data. Furthermore, we investigate excitonic effects using
+the $k \cdot p$ models and find exciton binding energy (0.81 eV) and exciton
+diameters consistent with experiments and {\it ab initio} based calculations.
+The proposed $k \cdot p$ Hamiltonians should be useful for investigating
+magnetic, spin, transport, optical properties and many-body effects in
+phosphorene.",1904.10328v3
+2020-08-28,Emergence of the strong tunable linear Rashba spin-orbit coupling of two-dimensional hole gases in semiconductor quantum,"Two-dimensional hole gases in semiconductor quantum wells are promising
+platforms for spintronics and quantum computation but suffer from the lack of
+the $\bf{k}$-linear term in the Rashba spin-orbit coupling (SOC), which is
+essential for spin manipulations without magnetism and commonly believed to be
+a $\bf{k}$-cubic term as the lowest order. Here, contrary to conventional
+wisdom, we uncover a strong and tunable $\bf{k}$-linear Rashba SOC in
+two-dimensional hole gases (2DHG) of semiconductor quantum wells by performing
+atomistic pseudopotential calculations combined with an effective Hamiltonian
+for a model system of Ge/Si quantum wells. Its maximal strength exceeds 120
+meV{\AA}, comparable to the highest values reported in narrow bandgap III-V
+semiconductor 2D electron gases, which suffers from short spin lifetime due to
+the presence of nuclear spin. We also illustrate that this emergent
+$\bf{k}$-linear Rashba SOC is a first-order direct Rashba effect, originating
+from a combination of heavy-hole-light-hole mixing and direct dipolar
+intersubband coupling to the external electric field. These findings confirm
+Ge-based 2DHG to be an excellent platform towards large-scale quantum
+computation.",2008.12523v2
+2023-12-30,Strain induced electronic and magnetic transition in S = 3/2 antiferromagnetic spin chain compound LaCrS3,"Exploring the physics of low-dimensional spin systems and their
+pressure-driven electronic and magnetic transitions are thriving research field
+in modern condensed matter physics. In this context, recently antiferromagnetic
+Cr-based compounds such as CrI3, CrBr3, CrGeTe3 have been investigated
+experimentally and theoretically for their possible spintronics applications.
+Motivated by the fundamental and industrial importance of these materials, we
+theoretically studied the electronic and magnetic properties of a relatively
+less explored Cr-based chalcogenide, namely LaCrS3 where 2D layers of magnetic
+Cr3+ ions form a rectangular lattice. We employed density functional theory +
+Hubbard U approach in conjunction with constrained random-phase approximation
+(cRPA) where the later was used to estimate the strength of U. Our findings at
+ambient pressure show that the system exhibits semiconducting antiferromagnetic
+ground state with a gap of 0.5 eV and large Cr moments that corresponds to
+nominal S=3/2 spin-state. The 1st nearest neighbor (NN) interatomic exchange
+coupling (J1) is found to be strongly antiferromagnetic (AFM), while 2nd NN
+couplings are relatively weaker ferromagnetic (FM), making this system a
+candidate for 1D non-frustrated antiferromagnetic spin-chain family of
+materials. Based on orbital resolved interactions, we demonstrated the reason
+behind two different types of interactions among 1st and 2nd NN despite their
+very similar bond lengths. We observe a significant spin-orbit coupling effect,
+giving rise to a finite magneto crystalline anisotropy, and
+Dzyaloshinskii-Moriya (DM) interaction. Further, we found that by applying
+uniaxial tensile strain along crystallographic a and b-axis, LaCrS3 exhibits a
+magnetic transition to a semi-conducting FM ground state, while compression
+gives rise to the realization of novel gapless semiconducting antiferromagnetic
+ground state.",2401.00239v1
+2005-05-30,Electronic structure and magnetism of LaVO3 and LaMnO3,"In this contribution we derive and discuss energy levels of the
+strongly-correlated d2 configuration of the V3+ ion (LaVO3) and of d4
+configuration of the Mn3+ ion (LaMnO3) in the octahedral surroundings in the
+presence of the spin-orbit coupling and the resulting magnetic properties. We
+take into account very strong correlations among the d electrons and work with
+strongly-correlated atomic-like electronic systems, ground term of which is,
+also in a solid, described by two Hund's rules quantum numbers. In a solid we
+take into account the influence of crystal-field interactions, predominantly of
+the cubic (octahedral) symmetry. We describe both paramagnetic state and the
+magnetically-ordered state getting a value of 1.3 uB for the V3+ -ion magnetic
+moment in the ordered state at 0 K for LaVO3 (3T1g) and of 3.7 uB for LaMnO3
+(5Eg). A remarkably consistent description of both zero-temperature properties
+and thermodynamic properties indicates on the high physical adequacy of the
+applied atomic approach. We point out the necessity to unquench the orbital
+moment in 3d-ion compounds. We claim that the intra-atomic spin-orbit coupling
+and strong electron correlations are indispensable for the physically adequate
+description of electronic and magnetic properties of LaVO3 and LaMnO3.",0505711v1
+2008-09-19,Doping a Mott insulator with orbital degrees of freedom,"We study the effects of hole doping on one-dimensional Mott insulators with
+orbital degrees of freedom. We describe the system in terms of a generalized
+t-J model. At a specific point in parameter space the model becomes integrable
+in analogy to the one-band supersymmetric t-J model. We use the Bethe ansatz to
+derive a set of nonlinear integral equations which allow us to study the
+thermodynamics exactly. Moving away from this special point in parameter space
+we use the density-matrix renormalization group applied to transfer matrices to
+study the evolution of various phases of the undoped system with doping and
+temperature. Finally, we study a one-dimensional version of a realistic model
+for cubic titanates which includes the anisotropy of the orbital sector due to
+Hund's coupling. We find a transition from a phase with antiferromagnetically
+correlated spins to a phase where the spins are fully ferromagnetically
+polarized, a strong tendency towards phase separation at large Hund's coupling,
+as well as the possibility of an instability towards triplet superconductivity.",0809.3427v1
+2011-04-04,Josephson current in carbon nanotubes with spin-orbit interaction,"We demonstrate that curvature-induced spin-orbit (SO) coupling induces a
+$0-\pi$ transition in the Josephson current through a carbon nanotube quantum
+dot coupled to superconducting leads. In the non-interacting regime, the
+transition can be tuned by applying parallel magnetic field near the critical
+field where orbital states become degenerate. Moreover, the interplay between
+charging and SO effects in the Coulomb Blockade and cotunneling regimes leads
+to a rich phase diagram with well-defined (analytical) boundaries in parameter
+space. Finally, the 0 phase always prevails in the Kondo regime. Our
+calculations are relevant in view of recent experimental advances in transport
+through ultra-clean carbon nanotubes.",1104.0513v1
+2012-08-29,Spin-orbital coupling in a triplet superconductor-ferromagnet junction,"We study a novel type of coupling between spin and orbital degrees of freedom
+which appears at triplet superconductor-ferromagnet interfaces. Using a
+self-consistent spatially-dependent mean-field theory, we show that increasing
+the angle between the ferromagnetic moment and the triplet vector order
+parameter enhances or suppresses the p-wave gap close to the interface,
+according as the gap antinodes are parallel or perpendicular to the boundary,
+respectively. The associated change in condensation energy establishes an
+orbitally-dependent preferred orientation for the magnetization. When both gap
+components are present, as in a chiral superconductor, we observe a first-order
+transition between different moment orientations as a function of the exchange
+field strength.",1208.5871v2
+2012-12-24,Fermiology of Strongly Spin-Orbit Coupled Superconductor Sn1-xInxTe and its Implication to Topological Superconductivity,"We have performed angle-resolved photoemission spectroscopy of the strongly
+spin-orbit coupled low-carrier density superconductor Sn1-xInxTe (x = 0.045) to
+elucidate the electronic states relevant to the possible occurrence of
+topological superconductivity recently reported for this compound from
+point-contact spectroscopy. The obtained energy-band structure reveals a small
+holelike Fermi surface centered at the L point of the bulk Brillouin zone,
+together with a signature of a topological surface state which indicates that
+this superconductor is essentially a doped topological crystalline insulator
+characterized by band inversion and mirror symmetry. A comparison of the
+electronic states with a band-non-inverted superconductor possessing a similar
+Fermi surface structure, Pb1-xTlxTe, suggests that the anomalous behavior in
+the superconducting state of Sn1-xInxTe is likely to be related to the peculiar
+orbital characteristics of the bulk valence band and/or the presence of a
+topological surface state.",1212.5886v1
+2013-03-13,"Ferromagnetic exchange, spin-orbit coupling and spiral magnetism at the LaAlO_3/SrTiO_3 interface","The electronic properties of the polar interface between insulating oxides is
+a subject of great current interest. An exciting new development is the
+observation of robust magnetism at the interface of two non-magnetic materials
+LaAlO_3 (LAO) and SrTiO_3 (STO). Here we present a microscopic theory for the
+formation and interaction of local moments, which depends on essential features
+of the LAO/STO interface. We show that correlation-induced moments arise due to
+interfacial splitting of orbital degeneracy. We find that gate-tunable Rashba
+spin-orbit coupling at the interface influences the exchange interaction
+mediated by conduction electrons. We predict that the zero-field ground state
+is a long-wavelength spiral and show that its evolution in an external field
+accounts semi-quantitatively for torque magnetometry data. Our theory describes
+qualitative aspects of the scanning SQUID measurements and makes several
+testable predictions for future experiments.",1303.3275v2
+2013-03-19,Electronic structure of relativistic Mott insulator Li$_2$RhO$_3$,"Motivated by studies of coexisting electron correlation and spin-orbit
+coupling effect in Na$_2$IrO$_3$ and a recent experiment of its 4d analogue
+Li$_2$RhO$_3$, we performed first-principles calculations of the rhodium oxide
+compound. The experimentally observed ground state of Li$_2$RhO$_3$ can be
+recovered only if both spin-orbit coupling and on-site Coulomb interaction are
+taken into consideration. Within the proper $U$ range for 4d-orbitals
+($2\leqslant U\leqslant 4$ eV), the ground state of Li$_2$RhO$_3$ could be
+either zigzag-AFM or stripy-AFM, both yielding energy gap close to experimental
+observation. Furthermore, the total energy differences between the competing
+magnetic phases are $\leqslant 3$ meV/Rh within $2\leqslant U\leqslant 4$ eV,
+manifesting strong magnetic frustration in the compound. Finally, the phase
+energy of Li$_2$RhO$_3$ cannot be fitted with the two-dimensional
+Heisenberg-Kitaev model involving only the nearest neighbor interactions, and
+we propose that inter-layer interactions may be responsible for the
+discrepancy.",1303.4675v1
+2013-03-30,"A generic tight-binding model for monolayer, bilayer and bulk MoS2","Molybdenum disulfide (MoS2) is a layered semiconductor which has become very
+important recently as an emerging electronic device material. Being an
+intrinsic semiconductor the two-dimensional MoS2 has major advantages as the
+channel material in field-effect transistors. In this work we determine the
+electronic structure of MoS2 with the highly accurate screened hybrid
+functional within the density functional theory (DFT) including the spin-orbit
+coupling. Using the DFT electronic structures as target, we have developed a
+single generic tight-binding (TB) model that accurately produces the electronic
+structures for three different forms of MoS2 - bulk, bilayer and monolayer. Our
+TB model is based on the Slater-Koster method with non-orthogonal sp3d5
+orbitals, nearest-neighbor interactions and spin-orbit coupling. The TB model
+is useful for atomistic modeling of quantum transport in MoS2 based electronic
+devices.",1304.0074v1
+2013-12-09,Interplay between Hund's coupling and spin-orbit interaction on elementary excitations in Sr2IrO4,"We study the elementary excitations in 5d transition metal oxideSr$_2$IrO$_4$
+by calculating the particle-hole Green's function within the random phase
+approximation on an antiferromagnetic ground state in the two-dimensional
+multi-orbital Hubbard model. The obtained magnetic excitations of bound states
+show a characteristic dispersion in consistent with the experiments. In
+addition, two new types of excitations are found due to the interplay between
+spin-orbit interaction and Hund's coupling: a magnetic excitation as a bound
+state, which has energy gap at the $\Gamma$ point, and an exciton as a resonant
+mode in the continuum of electron-hole pair creation.",1312.2348v2
+2014-09-25,Topological Phases in Oxide Heterostructures with Light and Heavy Transition Metal Ions,"Using a combination of density functional theory, tight-binding models, and
+Hartree-Fock theory, we predict topological phases with and without
+time-reversal symmetry breaking in oxide heterostructures. We consider both
+heterostructures containing light transition metal ions, and those containing
+heavy transition metal ions. We find the (111) growth direction naturally leads
+to favorable conditions for topological phases in both perovskite structures
+and pyrochlore structures. For the case of light transition metal elements,
+Hartree-Fock theory predicts the spin-orbit coupling is effectively enhanced by
+on-site multiple-orbital interactions and may drive the system through a
+topological phase transition, while heavy elements with intrinsically large
+spin-orbit coupling require much weaker, or even vanishing electron
+interactions to bring about a topological phase.",1409.7148v1
+2014-09-25,Spin-orbit decomposition of ab initio wavefunctions,"Although the modern shell-model picture of atomic nuclei is built from
+single-particle orbits with good total angular momentum $j$, leading to $j$-$j$
+coupling, phenomenological models suggested decades ago that for $0p$-shell
+nuclides a simpler picture can be realized via coupling of total spin $S$ and
+total orbital angular momentum $L$. I revisit this idea with large-basis,
+no-core shell model (NCSM) calculations using modern \textit{ab initio}
+two-body interactions, and dissect the resulting wavefunctions into their
+component $L$- and $S$-components. Remarkably, there is broad agreement with
+calculations using the phenomenological Cohen-Kurath forces, despite a gap of
+nearly fifty years and six orders of magnitude in basis dimensions. I suggest
+$L$-$S$ may be a useful tool for analyzing \textit{ab initio} wavefunctions of
+light nuclei, for example in the case of rotational bands.",1409.7355v2
+2015-01-31,Spontaneous multipole ordering by local parity mixing,"Broken spatial inversion symmetry in spin-orbital coupled systems leads to a
+mixing between orbitals with different parity, which results in unusual
+electronic structures and transport properties. We theoretically investigate
+the possibility of multipole ordering induced by a parity mixing. In
+particular, we focus on the system in which the parity mixing appears in a
+sublattice-dependent form. Starting from the periodic Anderson model with such
+a local parity mixing, we derive an extended Kondo lattice model with
+sublattice-dependent antisymmetric exchange couplings between itinerant
+electrons and localized spins. By the variational calculation, simulated
+annealing, and Monte Carlo simulation, we show that the model on a
+quasi-one-dimensional zig-zag lattice exhibits an odd-parity multipole order
+composed of magnetic toroidal and quadrupole components at and near half
+filling. The multipole order causes a band deformation with the band bottom
+shift and a magnetoelectric response. The results suggest that unusual
+odd-parity multipole orders will be widely observed in multi-orbital systems
+with local parity mixing.",1502.00057v1
+2016-01-07,Valley Plasmonics in the Dichalcogenides,"The rich phenomenology of plasmonic excitations in the dichalcogenides is
+analyzed as a function of doping. The many-body polarization, the dielectric
+response function and electron energy loss spectra are calculated using an ab
+initio based model involving material-realistic Coulomb interactions, band
+structure and spin-orbit coupling. Focusing on the representative case of
+MoS$_2$, a plethora of plasmon bands are observed, originating from scattering
+processes within and between the conduction or valence band valleys. We discuss
+the resulting square-root and linear collective modes, arising from long-range
+versus short-range screening of the Coulomb potential. We show that the
+multi-orbital nature of the bands and spin-orbit coupling strongly affects
+inter-valley scattering processes by gapping certain two-particle modes at
+large momentum transfer.",1601.01707v1
+2017-03-03,Photo-association of trilobite Rydberg molecules via resonant spin-orbit coupling,"We report on a novel method for photo-association of strongly polar trilobite
+Rydberg molecules. This exotic ultralong-range dimer, consisting of a
+ground-state atom bound to the Rydberg electron via electron-neutral
+scattering, inherits its polar character from the admixture of high angular
+momentum electronic orbitals. The absence of low-$L$ character hinders standard
+photo-association techniques. Here, we show that for suitable principal quantum
+numbers resonant coupling of the orbital motion with the nuclear spin of the
+perturber, mediated by electron-neutral scattering, hybridizes the trilobite
+molecular potential with the more conventional ${\rm{S}}$-type molecular state.
+This provides a general path to associate trilobite molecules with large
+electric dipole moments, as demonstrated via high-resolution spectroscopy. We
+find a dipole moment of 135(45) D for the trilobite state. Our results are
+compared to theoretical predictions based on a Fermi-model.",1703.01096v2
+2017-04-11,Possible Bicollinear Nematic State with Monoclinic Lattice Distortions in Iron Telluride Compounds,"Iron telluride FeTe is known to display bicollinear magnetic order at low
+temperatures together with a monoclinic lattice distortion. Because the
+bicollinear order can involve two different wavevectors $(\pi/2,\pi/2)$ and
+$(\pi/2,-\pi/2)$, symmetry considerations allow for the possible stabilization
+of a nematic state with short-range bicollinear order coupled to monoclinic
+lattice distortions at a $T_S$ higher than the temperature $T_N$ where
+long-range bicollinear order fully develops. As a concrete example, the
+three-orbitals spin-fermion model for iron telluride is studied with an
+additional coupling $\tilde\lambda_{12}$ between the monoclinic lattice strain
+and an orbital-nematic order parameter with $B_{2g}$ symmetry. Monte Carlo
+simulations show that with increasing $\tilde\lambda_{12}$ the first-order
+transition characteristic of FeTe splits and bicollinear nematicity is
+stabilized in a (narrow) temperature range. In this new regime the lattice is
+monoclinically distorted and short-range spin and orbital order breaks
+rotational invariance. A discussion of possible realizations of this exotic
+state is provided.",1704.03495v2
+2016-08-09,High-temperature large-gap quantum anomalous Hall insulator in ultrathin double perovskite films,"Motivated by the goal of realizing topological phases in thin films and
+heterostructures of correlated oxides, we propose here a quantum anomalous Hall
+insulator (QAHI) in ultrathin films of double perovskites based on mixed 3d-5d
+or 3d-4d transition metal ions, grown along the [111] direction. Considering
+the specific case of ultrathin Ba2FeReO6, we present a theoretical analysis of
+an effective Hamiltonian derived from first-principles. We establish that a
+strong spin-orbit coupling at Re site, t2g symmetry of the low-energy d-bands,
+polarity of its [111] orientation of perovskite structure, and mixed 3d-5d
+chemistry results in room temperature magnetism with a robust QAHI state of
+Chern number C=1 and a large band-gap. We uncover and highlight a
+non-relativistic orbital-Rashba-type effect in addition to the spin-orbit
+coupling, that governs this QAHI state. Our prediction of a large topological
+band-gap of ~100 meV in electronic structure, and a magnetic transition
+temperature Tc~300K estimated by Monte Carlo simulations, is expected to
+stimulate experimental efforts at synthesis of such films and enable possible
+practical applications of its dissipationless edge currents.",1608.02950v1
+2017-06-06,In-Plane Magnetization Induced Quantum Anomalous Hall Effect in Atomic Crystals of Group-V Elements,"We theoretically demonstrate that the in-plane magnetization induced quantum
+anomalous Hall effect (QAHE) can be realized in atomic crystal layers of
+group-V elements with buckled honeycomb lattice. We first construct a general
+tight-binding Hamiltonian with $sp^3$ orbitals via Slater-Koster two-center
+approximation, and then numerically show that for weak and strong spin-orbit
+couplings the systems harbor QAHEs with Chern numbers of $\mathcal{C}=\pm1$ and
+$\pm2$ , respectively. For the $\mathcal{C}=\pm1$ phases, we find the critical
+phase-transition magnetization from a trivial insulator to QAHE can become
+extremely small by tuning the spin-orbit coupling strength. Although the
+resulting band gap is small, it can be remarkably enhanced by orders via
+tilting the magnetization slightly away from the in-plane orientation. For the
+$\mathcal{C}=\pm2$ phases, we find that the band gap is large enough for the
+room-temperature observation. Although the critical magnetization is relatively
+large, it can be effectively decreased by applying a strain. All these suggest
+that it is experimentally feasible to realize high-temperature QAHE from
+in-plane magnetization in atomic crystal layers of group-V elements.",1706.01851v1
+2018-06-11,Giant perpendicular magnetic anisotropy in Fe/III-V nitride thin films,"Large perpendicular magnetic anisotropy (PMA) in transition metal thin films
+provides a pathway for enabling the intriguing physics of nanomagnetism and
+developing broad spintronics applications. After decades of searches for
+promising materials, the energy scale of PMA of transition metal thin films,
+unfortunately, remains only about 1 meV. This limitation has become a major
+bottleneck in the development of ultradense storage and memory devices. We
+discovered unprecedented PMA in Fe thin-film growth on the $(000\bar{1})$
+N-terminated surface of III-V nitrides from first-principles calculations. PMA
+ranges from 24.1 meV/u.c. in Fe/BN to 53.7 meV/u.c. in Fe/InN.
+Symmetry-protected degeneracy between $x^2-y^2$ and $xy$ orbitals and its lift
+by the spin-orbit coupling play a dominant role. As a consequence, PMA in
+Fe/III-V nitride thin films is dominated by first-order perturbation of the
+spin-orbit coupling, instead of second-order in conventional transition
+metal/oxide thin films. This game-changing scenario would also open a new field
+of magnetism on transition metal/nitride interfaces.",1806.04162v1
+2018-07-07,Topological multiferroic phases in the extended Kane-Mele-Hubbard Model in the Hofstadter regime,"We investigate the new quantum phases on the extended Kane-Mele-Hubbard model
+of honeycomb lattice in the Hofstadter regime. In this regime, orbital motion
+of the electrons can induce various topological phases with spontaneously
+broken symmetries when the spin orbit coupling and electron correlations
+coexist. Here, we consider the interaction effects in the Kane-Mele model and
+discuss possible phases in the presence of magnetic field at integer fillings
+of electrons. In particular, focusing on 2{\pi}/3 magnetic flux per plaquette,
+the realization of numerous quantum phases are discussed within the mean field
+framework; insulator with coplanar magnetic ordering, ferrimagnetic Chern
+insulator with nematic charge order, ferrimagnetic-ferrielectric Chern
+insulators etc. Many of these phase transitions are also accompanied with the
+change in the topological invariants of the system. Based on our theoretical
+study, we propose topological multiferroic phases with a scope of realization
+in 2D van-der Waals materials and optical lattice system where the significant
+interplay of magnetic field, spin orbit coupling and interactions can be
+engineered.",1807.02686v1
+2019-08-22,Direct observation of the spin-orbit coupling interaction in ring-core optical fibers,"Ring-core optical fibers have been designed to carry orbital angular momentum
+modes. We demonstrate the imaging of these modes, individually identifying
+modes separated temporally by only 30~ps. A single-pixel camera operating in
+the short-wave infrared detection range is used to image the 1550~nm wavelength
+optical modes. With this technique, examination of these optical modes can be
+performed with significantly higher temporal resolution than is possible with
+conventional imaging systems, such that the imaging of modes separated by
+spin-orbit coupling is achieved and evaluated. Deconvolution is required to
+separate the instrument response from the optical mode signal, increasing the
+clarity and temporal resolution of the measurement system.",1908.08252v1
+2020-08-07,Magnetoelastic and Magnetostrictive Properties of Co$_2$XAl Heusler Compounds,"We present a comprehensive first principles electronic structure study of the
+magnetoelastic and magnetostrictive properties in the Co-based Co$_2$XAl (X =
+V, Ti, Cr, Mn, Fe) full Heusler compounds. In addition to the commonly used
+total energy approach, we employ torque method to calculate the magnetoelastic
+tensor elements. We show that the torque based methods are in general
+computationally more efficient, and allow to unveil the atomic- and
+orbital-contributions to the magnetoelastic constants in an exact manner, as
+opposed to the conventional approaches based on second order perturbation with
+respect to the spin-orbit coupling. The magnetostriction constants are in good
+agreement with available experimental data. The results reveal that the main
+contribution to the magnetostriction constants, $\lambda_{100}$ and
+$\lambda_{111}$, arises primarily from the strained-induced modulation of the
+$\langle d_{x^2-y^2}|\hat{L}_z|d_{xy}\rangle$ and $\langle
+d_{z^2}|\hat{L}_x|d_{yz}\rangle$ spin orbit coupling matrix elements,
+respectively, of the Co atoms.",2008.03005v1
+2015-08-01,Non-collinear vs collinear description of the Ir-based one-$t_{2g}$ -hole perovskite-related compounds: SrIrO$_3$ and Sr$_2$IrO$_4$,"We present an analysis of the electronic structure of perovskite-related
+iridates, 5d electron compounds where a subtle interplay between spin-orbit
+coupling, tetragonal distortions and electron correlations determines the
+electronic structure properties. We suggest via electronic structure
+calculations that a non-collinear calculation is required to obtain solutions
+close to the usually quoted $j_{eff}$ = 1/2 state to describe the $t_{2g}$ hole
+in the $Ir^{4+} :d^5$ cation, while a collinear calculation yields a different
+solution, the hole is in a simpler xz/yz complex combination with a smaller
+$L_z /S_z$ ratio. We describe what the implications of this are in terms of the
+electronic structure; surprisingly, both solutions barely differ in terms of
+their band structure, and are similar to the one obtained by a tight binding
+model involving $t_{2g}$ orbitals with mean field interactions. We also analyze
+how the electronic structure and magnetism evolve with strain, with the
+spin-orbit coupling strength and with the on-site Coulomb repulsion, suggest
+the way the band structure gets modified and draw some comparisons with
+available experimental observations.",1508.00107v2
+2015-08-18,Transconductance and effective Landé factors for quantum point contacts: spin-orbit coupling and interaction effects,"We analyze the effective $g^*$ factors and their dependence on the
+orientation of the external magnetic field for a quantum point contact defined
+in the two-dimensional electron gas. The paper simulates the experimental
+procedure for evaluation of the effective Land\'e factors from the
+transconductance of a biased device in external magnetic field. The
+contributions of the orbital effects of the magnetic field, the
+electron-electron interaction and spin-orbit (SO) coupling are studied. The
+anisotropy of the $g^*$ factors for the in-plane magnetic field orientation,
+which seems counterintuitive from the perspective of the effective SO magnetic
+field, is explained in an analytical model of the constriction as due to the
+SO-induced subband mixing. The asymmetry of the transconductance as a function
+of the gate voltage is obtained in agreement with the experimental data and the
+results are explained as due to the depletion of the electron gas within the
+quantum point contact constriction and the related reduction of the screening
+as described within the DFT approach. The results for transconductance and the
+$g^*$ factors are in a good agreement with the experimental data [Phys. Rev. B
+{\bf 81}, 041303, 2010].",1508.04287v1
+2020-06-20,First-principles study of the effective Hamiltonian for Dirac fermions with spin-orbit coupling in two-dimensional molecular conductor $α$-(BETS)$_2$I$_3$,"We employed first-principles density-functional theory (DFT) calculations to
+characterize Dirac electrons in quasi-two-dimensional molecular conductor
+$\alpha$-(BETS)$_2$I$_3$ [= $\alpha$-(BEDT-TSeF)$_2$I$_3$] at a low temperature
+of 30K. We provide a tight-binding model with intermolecular transfer energies
+evaluated from maximally localized Wannier functions, where the number of
+relevant transfer integrals is relatively large due to the delocalized
+character of Se $p$ orbitals. The spin-orbit coupling gives rise to an exotic
+insulating state with an indirect band gap of about 2 meV. We analyzed the
+energy spectrum with a Dirac cone close to the Fermi level to develop an
+effective Hamiltonian with site-potentials, which reproduces the spectrum
+obtained by the DFT band structure.",2006.11455v3
+2021-06-24,"A first-principles investigation of band inversion in topologically nontrivial Na2AgX (X= As, Sb and Bi) full Heusler compounds","Topological nontrivial nature are the latest phases to be discovered in
+condensed matter physics with insulating bulk band gaps and topologically
+protected metallic surface states; they are one of the current hot topics
+because of their unique properties and potential applications. In this paper,
+we have highlighted a first-principles study of the structural stability and
+electronic behavior of the Na${}_{2}$AgX (X= As, Sb and Bi) full Heusler
+compounds, using the Full-Potential Linear Muffin-Tin Orbital (FP-LMTO) method.
+We have originated that the Hg${}_{2}$CuTi structure is appropriate in all
+studied materials. The negative values of the calculated formation energies
+mean that these compounds are energetically stable. The band structure is
+studied for the two cases relating the existence and the absence of
+spin-orbital couplings, where all materials are shown to be topologically
+non-trivial compounds. Spin orbital couplings were noticed to have no
+significant effect on the electronic properties such as the topological order.",2106.13184v1
+2021-10-22,Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^{4}$ magnet,"The competition between spin-orbit coupling $\lambda$ and electron-electron
+interaction $U$ leads to a plethora of novel states of matter, extensively
+studied in the context of $t_{2g}^4$ and $t_{2g}^5$ materials, such as
+ruthenates and iridates. Excitonic magnets -- the antiferromagnetic state of
+bounded electron-hole pairs -- is a prominent example of phenomena driven by
+those competing energy scales. Interestingly, recent theoretical studies
+predicted that excitonic magnets can be found in the ground-state of
+spin-orbit-coupled $t_{2g}^4$ Hubbard models. Here, we present a detailed
+computational study of the magnetic excitations in that excitonic magnet,
+employing one-dimensional chains (via density matrix renormalization group) and
+small two-dimensional clusters (via Lanczos). Specifically, first we show that
+the low-energy spectrum is dominated by a dispersive (acoustic) magnonic mode,
+with extra features arising from the $\lambda=0$ state in the phase diagram.
+Second, and more importantly, we found a novel magnetic excitation forming a
+high-energy optical mode with the highest intensity at wavevector $q\to 0$. In
+the excitonic condensation regime at large $U$, we also have found a novel
+high-energy $\pi$-mode composed solely of orbital excitations. These unique
+fingerprints of the $t_{2g}^4$ excitonic magnet are important in the analysis
+of neutron and RIXS experiments.",2110.11828v1
+2021-10-27,Predicting spin orbit coupling effect in the electronic and magnetic properties of cobalt (Co) doped WSe2 monolayer,"The electronic and magnetic properties of cobalt (Co) doped monolayer (ML)
+tungsten diselenide (WSe2) are investigated using the density functional theory
+with the on-site Hubbard potential correction (DFT+U) for the localized d
+orbitals of Co atom taking into account the spin orbit coupling (SOC)
+interaction. The results show that the substitution of Co at the W sites of ML
+WSe2 is energetically favorable under Se rich environment. We noticed that the
+Hund's exchange splitting (\Delta H_{ex}) is dominant over the crystal field
+splitting (\Delta_{cf}). The induced magnetic moment due to the Co-doped defect
+is ~3.00 \mu_B per Co atom. The magnetic interaction between two Co atoms at
+the nearest neighbor separation depends mainly on the concentration of the
+impurity atoms. The calculated value of curie temperature (TC) is increasing
+with increasing impurity concentration satisfying the Zener model. Based on the
+results, it can be proposed that the Co-doped WSe2 monolayer is potential
+candidate to apply in spintronics, optoelectronics, and magnetic storage
+devices.",2110.14801v2
+2022-11-10,Enhanced Spin-Orbit Coupling in a Correlated Metal,"We investigate the correlation effects on spin-orbit coupling (SOC) in a
+two-orbital Hubbard model on a square lattice by applying the variational Monte
+Carlo method. We consider an effective SOC constant $\lambda_{\text{eff}}$ in
+the one-body part of the variational wave function and mainly discuss the cases
+of the electron number per site $n=1$, that is, quarter filling. We find that
+$\lambda_{\text{eff}}$ is proportional to the bare value $\lambda$ and depends
+on the electron-electron interactions through $(U'-J')$ in a relatively wide
+parameter range in the paramagnetic (PM) phase, where $U'$ is the interorbital
+Coulomb interaction and $J'$ is the pair hopping interaction. Increasing the
+electron-electron interactions in the PM phase leads to a transition to an
+effective one-band state, in which the upper band becomes empty due to the
+enhanced $\lambda_{\text{eff}}$. We also construct phase diagrams considering
+magnetic order. The carrier doping effect on $\lambda_{\text{eff}}$ is also
+investigated. We find that $\lambda_{\text{eff}}$ enhances in a strongly
+correlated region around the Mott transition point and it is necessary to
+include the correlation effects beyond the Hartree-Fock approximation to
+describe the enhanced SOC properly.",2211.05354v1
+2023-10-30,Magnetotransport in spin-orbit coupled noncentrosymmetric and Weyl metals,"Recently, chiral anomaly (CA) has been proposed to occur in spin-orbit
+coupled noncentrosymmetric metals (SOC-NCMs), motivating CA to be a Fermi
+surface property rather than a Weyl node property. Although the nature of the
+anomaly is similar in both SOC-NCMs and Weyl systems, here we point out
+significant fundamental differences between the two. We show that the different
+nature of the orbital magnetic moment (OMM) in the two systems leads to
+non-trivial consequences -- particularly the sign of the longitudinal
+magnetoconductance always remains positive in a SOC non-centrosymmetric metal,
+unlike a Weyl metal that displays either sign. Furthermore,we investigate the
+planar Hall effect and the geometrical contribution to the Hall effect in the
+two systems and point out significant differences in the two systems. We
+conduct our analysis for magnetic and non-magnetic impurities, making our study
+important in light of current and upcoming experiments in both SOC-NCMs and
+Weyl metals.",2310.19877v1
+2004-11-17,Electronic Transport Spectroscopy of Carbon Nanotubes in a Magnetic Field,"We report magnetic field spectroscopy measurements in carbon nanotube quantum
+dots exhibiting four-fold shell structure in the energy level spectrum. The
+magnetic field induces a large splitting between the two orbital states of each
+shell, demonstrating their opposite magnetic moment and determining transitions
+in the spin and orbital configuration of the quantum dot ground state. We use
+inelastic cotunneling spectroscopy to accurately resolve the spin and orbital
+contributions to the magnetic moment. A small coupling is found between
+orbitals with opposite magnetic moment leading to anticrossing behavior at zero
+field.",0411440v1
+2005-07-20,"Spin, charge, and orbital correlations in the one-dimensional t2g-orbital Hubbard model","We present the zero-temperature phase diagram of the one-dimensional
+t2g-orbital Hubbard model, obtained using the density-matrix renormalization
+group and Lanczos techniques. Emphasis is given to the case for the electron
+density n=5 corresponding to five electrons per site, of relevance for some
+Co-based compounds. However, several other cases for electron densities between
+n=3 and 6 are also studied. At n=5, our results indicate a first-order
+transition between a paramagnetic (PM) insulator phase and a fully-polarized
+ferromagnetic (FM) state by tuning the Hund's coupling. The results also
+suggest a transition from the n=5 PM insulator phase to a metallic regime by
+changing the electron density, either via hole or electron doping. The behavior
+of the spin, charge, and orbital correlation functions in the FM and PM states
+are also described in the text and discussed. The robustness of these two
+states varying parameters suggests that they may be of relevance in more
+realistic higher dimensional systems as well.",0507472v1
+2008-03-14,Theoretical study of the electronic states of hollandite vanadate K$_2$V$_8$O$_{16}$,"We consider electronic properties of hollandite vanadate K$_2$V$_8$O$_{16}$,
+a one-dimensional zigzag-chain system of $t_{2g}$ orbitals in a mixed valent
+state. We first calculate the Madelung energy and obtain the relative stability
+of several charge-ordering patterns to determine the most stable one that is
+consistent with the observed superlattice structure. We then develop the
+strong-coupling perturbation theory to derive the effective spin-orbit
+Hamiltonian, starting from the triply-degenerate $t_{2g}$ orbitals in the
+VO$_6$ octahedral structure. We apply an exact-diagonalization technique on
+small clusters of this Hamiltonian and obtain the orbital-ordering pattern and
+spin structures in the ground state. We thereby discuss the electronic and
+magnetic properties of K$_2$V$_8$O$_{16}$ including predictions on the outcome
+of future experimental studies.",0803.2089v1
+2011-10-05,Two approximations to the bound states of Dirac-Hulthen problem,"The bound state (energy spectrum and two-spinor wave functions) solutions of
+the Dirac equation with the Hulthen potential for all angular momenta based on
+the spin and pseudospin symmetry are obtained. The parametric generalization of
+the Nikiforov-Uvarov method is used in the calculations. The orbital dependency
+(spin-orbit and pseudospin-orbit dependent coupling too singular 1/r^{2}) of
+the Dirac equation are included to the solution by introducing a more accurate
+approximation scheme to deal with the centrifugal (pseudo-centrifugal) term.
+The approximation is also made for the less singular 1/r orbital term in the
+Dirac equation for a wider energy spectrum. The nonrelativistic limits are also
+obtained on mapping of parameters.",1110.0940v2
+2012-03-14,Multi-orbital physics in Fermi liquids prone to magnetic order,"The interplay of spin-orbit-coupling and strong electronic correlations is
+studied for the single-layer and the bilayer compound of the strontium
+ruthenate Ruddlesden-Popper series by a combination of first-principles
+band-structure theory with mean-field rotationally invariant slave bosons. At
+equilibrium strongly renormalized (spin-orbit-split) quasiparticle bands are
+traced and a thorough description of the low-energy regime for the nearly
+ferromagnetic bilayer system in accordance with experimental data is presented.
+The metamagnetic response of Sr$_3$Ru$_2$O$_7$ in finite magnetic field $H$ is
+verified and a detailed analysis of the underlying correlated electronic
+structure provided. Intriguing multi-orbital physics on both local and
+itinerant level, such as e.g. competing paramagnetic and diamagnetic
+contributions, is observed with important differences depending on the
+magnetic-field angle $\theta$ with the crystallographic c axis.",1203.3148v2
+2012-03-17,Magnetic Phase Transition and Relaxation Effects in LiFePO4,"We report the observation of para - antiferromagnetic transition at ~ 50 K in
+lithium iron phosphate, LiFePO4 through DC magnetization and M\""ossbauer
+spectroscopy. The Ferrous ion Fe2+ (3d6, 5D) in LiFePO4 exhibits relaxation
+effects with a relaxation frequency ~1.076 \times 10(rise to 7) s-1 at 300 K.
+The temperature dependence of the frequency suggests the origin of the
+relaxation is spin-lattice type. The quadrupole splitting at low temperatures
+indicates the excited orbital states mix strongly to the orbital doublet ground
+state via spin-orbit coupling. Modified molecular field model analysis yields a
+saturation value for hyperfine field ~125 kOe. The anomaly in magnetization and
+M\""ossbauer parameters below 27 K may be ascribed to contribution of orbital
+angular momentum. The high value of the asymmetry parameter ({\eta} ~ 0.8) of
+the electric field gradient obtained in the antiferromagnetic regime indicates
+a strongly distorted octahedral oxygen neighbourhood for the ferrous sites.",1203.3863v2
+2013-10-16,Exact Results on Itinerant Ferromagnetism in Multi-orbital Systems on Square and Cubic Lattices,"We study itinerant ferromagnetism in multi-orbital Hubbard models in certain
+two-dimensional square and three-dimensional cubic lattices. In the strong
+coupling limit where doubly occupied orbitals are not allowed, we prove that
+the fully spin-polarized states are the unique ground states, apart from the
+trivial spin degeneracies, for a large region of fillings factors. Possible
+applications to p-orbital bands with ultra-cold fermions in optical lattices,
+and electronic 3d-orbital bands in transition-metal oxides, are discussed.",1310.4391v3
+2014-10-13,Isometry Group Orbit Quantization of Spinning Strings in AdS_3 x S^3,"Describing the bosonic AdS_3 x S^3 particle and string in SU(1,1) x SU(2)
+group variables, we provide a Hamiltonian treatment of the isometry group
+orbits of solutions via analysis of the pre-symplectic form. For the particle
+we obtain a one-parameter family of orbits parameterized by
+creation-annihilation variables, which leads to the Holstein-Primakoff
+realization of the isometry group generators. The scheme is then applied to
+spinning string solutions characterized by one winding number in AdS_3 and two
+winding numbers in S^3. We find a two-parameter family of orbits, where
+quantization again provides the Holstein-Primakoff realization of the symmetry
+generators with an oscillator type energy spectrum. Analyzing the minimal
+energy at strong coupling we verify the spectrum of short strings at special
+values of winding numbers.",1410.3428v2
+2015-06-22,Spin-orbit coupling and chaotic rotation for circumbinary bodies. Application to the small satellites of the Pluto-Charon system,"We investigate the resonant rotation of circumbinary bodies in planar
+quasi-circular orbits. Denoting $n_b$ and $n$ the orbital mean motion of the
+inner binary and of the circumbinary body, respectively, we show that
+spin-orbit resonances exist at the frequencies $n\pm k\nu/2$, where $\nu = n_b
+- n$, and $k$ is an integer. Moreover, when the libration at natural frequency
+has the same magnitude as $\nu$, the resonances overlap and the rotation
+becomes chaotic. We apply these results to the small satellites in the
+Pluto-Charon system, and conclude that their rotations are likely chaotic.
+However, the rotation can also be stable and not synchronous for small axial
+asymmetries.",1506.06733v3
+2016-06-11,Spin-Orbit Interactions and the Nematicity Observed in the Fe-Based Superconductors,"High-resolution angle-resolved photoelectron spectroscopy is used to examine
+the electronic band structure of FeTe$_{0.5}$Se$_{0.5}$ near the Brillouin zone
+center. A consistent separation of the $\alpha_{1}$ and $\alpha_{2}$ bands is
+observed with little $k_{z}$ dependence of the $\alpha_{1}$ band.
+First-principles calculations for bulk and thin films demonstrate that the
+antiferromagnetic coupling between the Fe atoms and hybridization-induced
+spin-orbit effects lifts the degeneracy of the Fe $d_{xz}$ and $d_{yz}$
+orbitals at the zone center leading to orbital ordering. These experimental and
+computational results provide a natural microscopic basis for the nematicity
+observed in the Fe-based superconductors.",1606.03536v1
+2016-07-03,First-Principles Momentum Dependent Local Ansatz Approach to the Ground-State Properties of Iron-Group Transition Metals,"The ground-state properties of iron-group transition metals from Sc to Cu
+have been investigated on the basis of the first-principles momentum dependent
+local ansatz (MLA) theory. Correlation energy gain is found to show large
+values for Mn and Fe: 0.090 Ry (Mn) and 0.094 Ry (Fe). The Hund-rule coupling
+energies are found to be 3000 K (Fe), 1400 K (Co), and 300 K (Ni). It is
+sugested that these values can resolve the inconsistency in magnetic energy
+between the density functional theory and the first-principles dynamical
+coherent potential approximation theory at finite temperatures. Charge
+fluctuations are shown to be suppressed by the intra-orbital correlations and
+inter-orbital charge-charge correlations, so that they show nearly constant
+values from V to Fe: 1.57 (V and Cr), 1.52 (Mn), and 1.44 (Fe), which are
+roughly twice as large as those obtained by the $d$ band model. The amplitudes
+of local moments are enhanced by the intra-orbital and inter-orbital spin-spin
+correlations and show large values for Mn and Fe: 2.87 (Mn) and 2.58 (Fe).
+These values are in good agreement with the experimental values estimated from
+the effective Bohr magneton number and the inner core photoemission data.",1607.00632v1
+2016-08-23,Arbitrary optical wavefront shaping via spin-to-orbit coupling,"Converting spin angular momentum to orbital angular momentum has been shown
+to be a practical and efficient method for generating optical beams carrying
+orbital angular momentum and possessing a space-varying polarized field. Here,
+we present novel liquid crystal devices for tailoring the wavefront of optical
+beams through the Pancharatnam-Berry phase concept. We demonstrate the
+versatility of these devices by generating an extensive range of optical beams
+such as beams carrying $\pm200$ units of orbital angular momentum along with
+Bessel, Airy and Ince-Gauss beams. We characterize both the phase and the
+polarization properties of the generated beams, confirming our devices'
+performance.",1608.06603v1
+2018-09-25,Two-orbital Hubbard model vs spin $S=1$ Heisenberg model: studies on clusters,"We perform exact numeric calculations for the two-orbital Hubbard model on
+the four-site cluster. In the limit of large on-site coupling the model becomes
+equivalent to the spin $S=1$ Heisenberg model. By comparing energy spectra of
+these two models, we quantified the range of interaction parameters for which
+the Heisenberg model satisfactorily reproduces the two-orbital Hubbard model.
+Then we examined how the spectrum evolves when we are outside of this region,
+focusing especially on checking of how it is modified when various ways of
+interatomic hoppings of electrons between different orbitals are taken into
+account. We finally show how these modifications affect the dependence of
+specific heat on temperature.",1809.09483v1
+2020-10-24,Topological bands in two-dimensional orbital-active bipartite lattices,"The search for large gap quantum spin Hall (QSH) and quantum anomalous Hall
+(QAH) insulators is important both for fundamental and practical interests. The
+degenerate multi-orbitals $p_x,p_y$ in honeycomb lattice provides a paradigm
+for QSH state with a boosted topological gap of the first order in atomic
+spin-orbit coupling. By using elementary band representation, we explore the
+feasibility of this mechanism for QSH in general two-dimensional lattices, and
+find that the biparticle lattices with $C_{3v}$ or $C_{4v}$ symmetry and
+degenerate multi-orbitals could work. We further provide concrete tight-binding
+models on honeycomb, kagome and square lattices to demonstrate the desired
+topological physics. By introducing ferromagnetism into QSH state, we extend
+the mechanism to QAH state with a boosted gap. The QSH and QAH states can be
+achieved when Fermi level is at integer filling only for honeycomb lattice, but
+at certain fractional filling for other lattices. We conclude with a brief
+discussion on the possible material venues for such mechanism.",2010.12823v1
+2016-10-05,"Orbital frustration in the S = 1/2 kagome magnet vesignieite, BaCu3V2O8(OD)2","Here we report crystallographic and magnetic studies on high quality samples
+of the magnetically frustrated S = 1/2 kagome antiferromagnet vesignieite,
+BaCu3V2O8(OD)2. Powder neutron diffraction data collected from samples obtained
+by a new hydrothermal synthetic route reveal a previously unobserved trigonal
+P3121 structure, similar to the isoelectronic mineral SrCu3V2O8(OH)2. The
+refined structure is consistent with orbital frustration of the eg d-orbitals
+in a sublattice of the Cu2+ kagome network due to a dynamic Jahn-Teller effect,
+which persists below the magnetic transition at TN = 9K and makes the material
+an interesting candidate for exploring concomitant spin and orbital
+frustration. A combination of crystallographic strain analysis and
+magnetisation measurements indicate strong magnetostructural coupling which may
+explain the varied magnetic behaviour between samples of vesignieite in the
+literature. The revised orbital structure is similar to that found in
+volborthite, rather than the quantum spin liquid herbertsmithite, and provides
+a convincing argument for the differing magnetic properties found in these
+frustrated magnets.",1610.01436v1
+2021-02-08,Evidence of orbital ferromagnetism in twisted bilayer graphene aligned to hexagonal boron nitride,"We have previously reported ferromagnetism evinced by a large hysteretic
+anomalous Hall effect in twisted bilayer graphene (tBLG). Subsequent
+measurements of a quantized Hall resistance and small longitudinal resistance
+confirmed that this magnetic state is a Chern insulator. Here we report that,
+when tilting the sample in an external magnetic field, the ferromagnetism is
+highly anisotropic. Because spin-orbit coupling is negligible in graphene such
+anisotropy is unlikely to come from spin, but rather favors theories in which
+the ferromagnetism is orbital. We know of no other case in which ferromagnetism
+has a purely orbital origin. For an applied in-plane field larger than $5\
+\mathrm{T}$, the out-of-plane magnetization is destroyed, suggesting a
+transition to a new phase.",2102.04039v2
+2022-01-11,Effects of spin-orbit interaction and electron correlations in strontium titanate,"We show that the Bloch states in the conduction band of SrTiO$_3$ arise from
+the interplay between highly anisotropic hopping in sub-bands derived from the
+Ti $t_{2g}$ orbitals and spin-orbit coupling that mixes these orbitals. Because
+of the nearly flat-band characteristics for one of the principal axes, at
+sufficiently high doping these Bloch states become unstable with respect to
+electron interactions, resulting in Mott-like singlet correlations. These
+findings may be relevant to the anomalous electronic properties of SrTiO$_3$,
+including its unusual superconductivity.",2201.04184v5
+2022-10-26,Oxygen vacancies at the origin of pinned moments in oxide interfaces: the example of tetragonal CuO/SrTiO$_3$,"Obtaining an accurate theoretical description of the emergent phenomena in
+oxide heterostructures is a major challenge. Recently, intriguing paramagnetic
+spin and pinned orbital moments have been discovered by x-ray magnetic circular
+dichro\""ism measurements at the Cu $L_{2,3}$-edge of a tetragonal CuO/SrTiO$_3$
+heterostructure. Using first principles calculations, we propose a scenario
+that explains both types of moments, based on the formation of oxygen vacancies
+in the TiO$_2$ interface layer. We show the emergence of a paramagnetic 2D
+electron gas hosted in the interface CuO layer. It is invisible at the Ti
+$L_{2,3}$-edge since the valence of the Ti atoms remains unchanged. Strong
+structural distortions breaking both the local and global fourfold rotation
+$C_4$ symmetries at the interface lead to the in-plane pinning of the Cu
+orbital moment close to the vacancy. Our results, and in particular the pinning
+of the orbital moment, may have implications for other systems, especially
+monoxide/dioxide interfaces with similar metal-oxygen bond length and weak
+spin-orbit coupling.",2210.15084v1
+2023-07-10,Quantum oscillations with topological phases in a kagome metal CsTi$_3$Bi$_5$,"Quantum oscillations can reveal Fermi surfaces and their topology in solids
+and provide a powerful tool for understanding transport and electronic
+properties. It is well established that the oscillation frequency maps the
+Fermi surface area by Onsager's relation. However, the topological phase
+accumulated along the quantum orbit remains difficult to estimate in
+calculations, because it includes multiple contributions from the Berry phase,
+orbital and spin moments, and also becomes gauge-sensitive for degenerate
+states. In this work, we develop a gauge-independent Wilson loop scheme to
+evaluate all topological phase contributions and apply it to CsTi$_3$Bi$_5$, an
+emerging kagome metal. We find that the spin-orbit coupling dramatically alters
+the topological phase compared to the spinless case. Especially, oscillation
+phases of representative quantum orbits demonstrate a strong 3D signature
+despite their cylinder-like Fermi surface geometry. Our work reveals the Fermi
+surface topology of CsTi$_3$Bi$_5$ and paves the way for the theoretical
+investigation of quantum oscillations in realistic materials.",2307.04750v1
+2010-07-09,The spin states of Co ions in La1.5Ca0.5CoO4 from first-principles,"The spin states and electronic structure of layered perovskite La1.5Ca0.5CoO4
+are investigated using fullpotential linearized augmented plane-wave method.
+All the computational results indicate that the Co2+ ion is in a high-spin
+state and the Co3+ in a low-spin state. The Co2+ t2g orbitals with a small
+crystal-field splitting are mixed by spin-orbit coupling, which accounts for
+the observed easy in-plane magnetism. The nonmagnetic LS-Co3+ state, which is
+stabilized by a strong crystal field, provides a natural explanation for the
+observed low magnetic ordering temperature and a spin-blockade phenomenon of
+the electron hopping. Furthermore, we find that the intermediate-spin state of
+Co3+ has a large multiplet splitting. But the lowest-lying IS state of Co3+ is
+still higher in energy than the LS ground state by a few hundred millielectron
+volts and the HS state of Co3+ is even less stable, both in sharp contrast to a
+recent experimental study which suggested the HS+IS mixed Co3+ ground state. We
+note that either the IS-Co3+ or HS-Co3+ states or their mixture would produce a
+wrong out-of-plane magnetic anisotropy and a much higher magneticordering
+temperature than observed. Thus, the present work sheds light on this material
+concerning its electronic and magnetic structure, and it would stimulate
+different experiments to settle this intriguing spin-state issue.",1007.1494v2
+2011-10-22,Theory of electronic properties and quantum spin blockade in a gated linear triple quantum dot with one electron spin each,"We present a theory of electronic properties and the spin blockade phenomena
+in a gated linear triple quantum dot. Quadruple points where four different
+charge configurations are on resonance, particularly involving (1,1,1)
+configuration, are considered. In the symmetric case, the central dot is biased
+to higher energy and a single electron tunnels through the device when (1,1,1)
+configuration is resonant with (1,0,1),(2,0,1),(1,0,2) configurations. The
+electronic properties of a triple quantum dot are described by a Hubbard model
+containing two orbitals in the two unbiased dots and a single orbital in the
+biased dot. The transport through the triple quantum dot molecule involves both
+singly and doubly occupied configurations and necessitates the description of
+the (1,1,1) configuration beyond the Heisenberg model. Exact eigenstates of the
+triple quantum dot molecule with up to three electrons are used to compute
+current assuming weak coupling to the leads and non-equilibrium occupation of
+quantum molecule states obtained from the rate equation. The intra-molecular
+relaxation processes due to acoustic phonons and cotunneling with the leads are
+included, and are shown to play a crucial role in the spin blockade effect. We
+find a quantum interference-based spin blockade phenomenon at low source-drain
+bias and a distinct spin blockade due to a trap state at higher bias. We also
+show that, for an asymmetric quadruple point with
+(0,1,1),(1,1,1,),(0,2,1),(0,1,2) configurations on resonance, the spin blockade
+is analogous to the spin blockade in a double quantum dot.",1110.4982v1
+2013-11-02,Quantum-ring spin interference device tuned by quantum point contacts,"We introduce a spin-interference device that comprises a quantum ring (QR)
+with three embedded quantum point contacts (QPCs) and study theoretically its
+spin transport properties in the presence of Rashba spin-orbit interaction. Two
+of the QPCs conform the lead-to-ring junctions while a third one is placed
+symmetrically in the upper arm of the QR. Using an appropriate scattering model
+for the QPCs and the $\mathbb{S}$-matrix scattering approach, we analyze the
+role of the QPCs on the Aharonov-Bohm (AB) and Aharonov-Casher (AC) conductance
+oscillations of the QR-device. Exact formulas are obtained for the
+spin-resolved conductances of the QR-device as a function of the confinement of
+the QPCs and the AB/AC phases. Conditions for the appearance of resonances and
+anti-resonances in the spin-conductance are derived and discussed. We predict
+very distinctive variations of the QR-conductance oscillations not seen in
+previous QR proposals. In particular we find that the interference pattern in
+the QR can be manipulated to a large extend by varying electrically the
+lead-to-ring topological parameters. The latter can be used to modulate the AB
+and AC phases by applying gate voltage only. We have shown also that the
+conductance oscillations exhibits a crossover to well-defined resonances as the
+lateral QPC confinement strength is increased, mapping the eigenenergies of the
+QR. In addition, unique features of the conductance arises by varying the
+aperture of the upper-arm QPC and the Rashba spin-orbit coupling. Our results
+may be of relevance for promising spin-orbitonics devices based in quantum
+interference mechanisms.",1311.0406v1
+2016-04-25,Probing variations of the Rashba spin-orbit coupling at the nanometer scale,"The Rashba effect as an electrically tunable spin-orbit interaction is the
+base for a multitude of possible applications such as spin filters, spin
+transistors, and quantum computing using Majorana states in nanowires.
+Moreover, this interaction can determine the spin dephasing and
+antilocalization phenomena in two dimensions. However, the real space pattern
+of the Rashba parameter has never been probed, albeit it critically influences,
+e.g., the more robust spin transistors using the spin helix state and the
+otherwise forbidden electron backscattering in topologically protected
+channels. Here, we map this pattern down to nanometer length scales by
+measuring the spin splitting of the lowest Landau level using scanning
+tunnelling spectroscopy. We reveal strong fluctuations correlated with the
+local electrostatic potential for an InSb inversion layer with a large Rashba
+coefficient (~1 eV{\AA}). The novel type of Rashba field mapping enables a more
+comprehensive understanding of the critical fluctuations, which might be
+decisive towards robust semiconductor-based spintronic devices.",1604.07326v1
+2017-02-21,All-optical Detection of Spin Hall Angle in W/CoFeB/SiO2 Heterostructures by Varying Tungsten Layer Thickness,"The development of advanced spintronics devices hinges on the efficient
+generation and utilization of pure spin current. In materials with large
+spin-orbit coupling, the spin Hall effect may convert charge current to pure
+spin current and a large conversion efficiency, which is quantified by spin
+Hall angle (SHA), is desirable for the realization of miniaturized and energy
+efficient spintronic devices. Here, we report a giant SHA in beta-tungsten
+(\b{eta}-W) thin films in Sub/W(t)/Co20Fe60B20(3 nm)/SiO2(2 nm)
+heterostructures with variable W thickness. We employed an all-optical
+time-resolved magneto-optical Kerr effect microscope for an unambiguous
+determination of SHA using the principle of modulation of Gilbert damping of
+the adjacent ferromagnetic layer by the spin-orbit torque from the W layer. A
+non-monotonic variation of SHA with W layer thickness (t) is observed with a
+maximum of about 0.4 at about t = 3 nm, followed by a sudden reduction to a
+very low value at t = 6 nm. This variation of SHA with W-thickness correlates
+well with the thickness dependent structural phase transition and resistivity
+variation of W above the spin diffusion length of W, while below this length
+the interfacial electronic effect at W/CoFeB influences the estimation of SHA.",1702.06258v1
+2018-05-22,FMR-related phenomena in spintronic devices,"Spintronic devices, such as non-volatile magnetic random access memories and
+logic devices, have attracted considerable attention as potential candidates
+for future high efficient data storage and computing technology. In a heavy
+metal or other emerging material with strong spin-orbit coupling (SOC), the
+charge currents induce spin currents or spin accumulations via SOC. The
+generated spin currents can exert spin-orbit torques (SOTs) on an adjacent
+ferromagnet, which opens up a new way to realize magnetization dynamics and
+switching of the ferromagnetic layer for spintronic devices. In the SOT scheme,
+the charge-to-spin interconversion efficiency (SOT efficiency) is an important
+figure of merit for applications. For the effective characterization of this
+efficiency, the ferromagnetic resonance (FMR) based methods, such as the spin
+transfer torque ferromagnetic resonance (ST-FMR) and the spin pumping, are
+common utilized in addition to low frequency harmonic or dc measurements. In
+this review, we focus on the ST-FMR measurements for the evaluation of the SOT
+efficiency. We provide a brief summary of the different ST-FMR setups and data
+analysis methods. We then discuss ST-FMR and SOT studies in various materials,
+including heavy metals and alloys, topological insulators, two dimensional (2D)
+materials, interfaces with strong Rashba effect, antiferromagnetic materials,
+two dimensional electron gas (2DEG) in oxide materials and oxidized nonmagnetic
+materials.",1805.08496v1
+2019-10-15,Bulk Rashba Effect in Multiferroics: a theoretical prediction for BiCoO3,"We put forward the concept of a bulk Rashba effect emerging in a multiferroic
+material, such as an antiferromagnetic system with a polar crystal structure.
+According to symmetry considerations, while time-reversal and space-inversion
+symmetries are both broken, there exist specific spin flipping operations that
+relate opposite spin sites in the magnetic crystal structure. As a consequence,
+at certain high-symmetry points in the momentum space, the magnetic point group
+allows the spin angular momentum to be locked to the linear momentum, a typical
+feature of the Rashba effect. In such a case, spin-splitting effects induced by
+spin-orbit coupling can arise, similar to what happens in non-magnetic Rashba
+systems. As a prototypical example, ab-initio calculations of antiferromagnetic
+BiCoO3 in the polar structure reveal that a large Rashba-like band- and spin-
+splitting occurs at the conduction band bottom, having a large weight from Bi-p
+orbital states. Moreover, we show that the spin texture of such a multiferroic
+can be modulated by applying a magnetic field. In particular, an external
+in-plane magnetic field is predicted not only to induce spin-canting, but also
+a distortion of the energy isocontours and a shift of the spin-vortex (centered
+on the high-symmetry point and characteristic of Rashba effect) along a
+direction perpendicular to the applied field.",1910.06758v1
+2016-03-29,Giant g factor tuning of long-lived electron spins in Ge,"Control of electron spin coherence via external fields is fundamental in
+spintronics. Its implementation demands a host material that accommodates the
+highly desirable but contrasting requirements of spin robustness to relaxation
+mechanisms and sizeable coupling between spin and orbital motion of charge
+carriers. Here we focus on Ge, which, by matching those criteria, is rapidly
+emerging as a prominent candidate for shuttling spin quantum bits in the mature
+framework of Si electronics. So far, however, the intrinsic spin-dependent
+phenomena of free electrons in conventional Ge/Si heterojunctions have proved
+to be elusive because of epitaxy constraints and an unfavourable band
+alignment. We overcome such fundamental limitations by investigating a two
+dimensional electron gas (2DEG) confined in quantum wells of pure Ge grown on
+SiGe-buffered Si substrates. These epitaxial systems demonstrate exceptionally
+long spin relaxation and coherence times, eventually unveiling the potential of
+Ge in bridging the gap between spintronic concepts and semiconductor device
+physics. In particular, by tuning spin-orbit interaction via quantum
+confinement we demonstrate that the electron Land\'e g factor and its
+anisotropy can be engineered in our scalable and CMOS-compatible architectures
+over a range previously inaccessible for Si spintronics.",1603.08783v1
+2020-09-22,Magnon-mediated spin currents in Tm3Fe5O12/Pt with perpendicular magnetic anisotropy,"The control of pure spin currents carried by magnons in magnetic insulator
+(MI) garnet films with a robust perpendicular magnetic anisotropy (PMA) is of
+great interest to spintronic technology as they can be used to carry, transport
+and process information. Garnet films with PMA present labyrinth domain
+magnetic structures that enrich the magnetization dynamics, and could be
+employed in more efficient wave-based logic and memory computing devices. In
+MI/NM bilayers, where NM being a normal metal providing a strong spin-orbit
+coupling, the PMA benefits the spin-orbit torque (SOT) driven magnetization's
+switching by lowering the needed current and rendering the process faster,
+crucial for developing magnetic random-access memories (SOT-MRAM). In this
+work, we investigated the magnetic anisotropies in thulium iron garnet (TIG)
+films with PMA via ferromagnetic resonance measurements, followed by the
+excitation and detection of magnon-mediated pure spin currents in TIG/Pt driven
+by microwaves and heat currents. TIG films presented a Gilbert damping constant
+{\alpha}~0.01, with resonance fields above 3.5 kOe and half linewidths broader
+than 60 Oe, at 300 K and 9.5 GHz. The spin-to-charge current conversion through
+TIG/Pt was observed as a micro-voltage generated at the edges of the Pt film.
+The obtained spin Seebeck coefficient was 0.54 {\mu}V/K, confirming also the
+high interfacial spin transparency.",2009.10299v1
+2022-04-18,Hole spin qubits in thin curved quantum wells,"Hole spin qubits are frontrunner platforms for scalable quantum computers
+because of their large spin-orbit interaction which enables ultrafast
+all-electric qubit control at low power. The fastest spin qubits to date are
+defined in long quantum dots with two tight confinement directions, when the
+driving field is aligned to the smooth direction. However, in these systems the
+lifetime of the qubit is strongly limited by charge noise, a major issue in
+hole qubits. We propose here a different, scalable qubit design, compatible
+with planar CMOS technology, where the hole is confined in a curved germanium
+quantum well surrounded by silicon. This design takes full advantage of the
+strong spin-orbit interaction of holes, and at the same time suppresses charge
+noise in a wide range of configurations, enabling highly coherent, ultrafast
+qubit gates. While here we focus on a Si/Ge/Si curved quantum well, our design
+is also applicable to different semiconductors. Strikingly, these devices allow
+for ultrafast operations even in short quantum dots by a transversal electric
+field. This additional driving mechanism relaxes the demanding design
+constraints, and opens up a new way to reliably interface spin qubits in a
+single quantum dot to microwave photons. By considering state-of-the-art
+high-impedance resonators and realistic qubit designs, we estimate interaction
+strengths of a few hundreds of MHz, largely exceeding the decay rate of spins
+and photons. Reaching such a strong coupling regime in hole spin qubits will be
+a significant step towards high-fidelity entangling operations between distant
+qubits, as well as fast single-shot readout, and will pave the way towards the
+implementation of a large-scale semiconducting quantum processor.",2204.08212v1
+2011-07-13,Coulomb singularities in scattering wave functions of spin-orbit-coupled states,"We report on our analysis of the Coulomb singularity problem in the frame of
+the coupled channel scattering theory including spin-orbit interaction. We
+assume that the coupling between the partial wave components involves orbital
+angular momenta such that $\Delta l = 0, \pm 2$. In these conditions, the two
+radial functions, components of a partial wave associated to two values of the
+angular momentum $l$, satisfy a system of two second-order ordinary
+differential equations. We examine the difficulties arising in the analysis of
+the behavior of the regular solutions near the origin because of this coupling.
+First, we demonstrate that for a singularity of the first kind in the
+potential, one of the solutions is not amenable to a power series expansion.
+The use of the Lippmann-Schwinger equations confirms this fact: a logarithmic
+divergence arises at the second iteration. To overcome this difficulty, we
+introduce two auxilliary functions which, together with the two radial
+functions, satisfy a system of four first-order differential equations. The
+reduction of the order of the differential system enables us to use a
+matrix-based approach, which generalizes the standard Frobenius method. We
+illustrate our analysis with numerical calculations of coupled scattering wave
+functions in a solid-state system.",1107.2643v1
+2023-02-02,Spin waves in a ferromagnetic topological metal,"In most metals, charges and spins can hop rapidly between atoms, yielding
+strong dispersion of their energy versus momentum. There are, however, special
+arrangements of atoms, such as twisted graphene bilayers or lattices which
+resemble woven bamboo ""kagome"" mats, so that particle motion with strong
+hopping between neighbours becomes nearly or even completely dispersionless.
+Such flat bands are interesting because the interactions between the heavy
+particles inhabiting them will become much more important than for strong
+dispersion, resulting in novel quantum solid and liquid states, particularly
+when topology enters on account of significant spin-orbit coupling for the
+underlying electrons. Nonetheless, spectroscopic evidence for flat bands
+engendered by lattice geometry rather than weak hopping is rare, particularly
+for metallic single crystals. Here we report the discovery, using circularly
+polarized X-Rays in resonant absorption and inelastic scattering (RIXS) for the
+unambiguous isolation of magnetic signals, of a flat spin wave band and large
+orbital moment for the metallic kagome ferromagnet Fe$_3$Sn$_2$, which has a
+topologically non-trivial electronic band structure controllable by modest
+external magnetic fields. The flat mode energy is consistent with the high
+Curie temperature ($T_C$ ~ 640 K) as well as the strong acoustic mode
+dispersion, implying, together with the substantial spin-orbit coupling
+indicated by the large orbital moment, that the mode is topological. The
+measured properties of the spin waves are highly unconventional, and include
+very severe damping as well as the flat mode amplitude which is maximized in
+the long wavelength limit where it is ordinarily expected to vanish. Our
+results open the topic of interactions of topological bosons (spin waves) and
+fermions (electrons) with the very specific target of explaining boson
+lifetimes and amplitudes.",2302.01457v1
+2017-02-24,Thermoelectric unipolar spin battery in a suspended carbon nanotube,"A quantum dot formed in a suspended carbon nanotube exposed to an external
+magnetic field is predicted to act as a thermoelectric unipolar spin battery
+which generates pure spin current. The built-in spin flip mechanism is a
+consequence of the spin-vibration interaction resulting from the interplay
+between the intrinsic spin-orbit coupling and the vibrational modes of the
+suspended carbon nanotube. On the other hand, utilizing thermoelectric effect,
+the temperature difference between the electron and the thermal bath to which
+the vibrational modes are coupled provides the driving force. We find that both
+magnitude and direction of the generated pure spin current are dependent on the
+strength of spin-vibration interaction, the sublevel configuration in dot, the
+temperatures of electron and thermal bath, and the tunneling rate between the
+dot and the pole. Moreover, in the linear response regime, the kinetic
+coefficient is non-monotonic in the temperature $T$ and it reaches its maximum
+when $k_BT$ is about one phonon energy. The existence of a strong intradot
+Coulomb interaction is irrelevant for our spin battery, provided that
+high-order cotunneling processes are suppressed.",1702.07616v1
+2018-02-03,Spin Hall effect in Rashba-Dresselhaus planar strips in the presence of electron correlations,"A model with both Rashba and Dresselhaus spin orbit (SO) couplings and
+Hubbard electron-electron interaction is studied on planar strips at quarter
+filling at zero temperature in the clean limit. In the absence of Hubbard
+repulsion and at equilibrium, within linear response theory, a nonmonotonic
+behavior of the spin Hall conductivity as a function of the ratio of the Rashba
+(alpha) and Dresselhaus (beta) strengths was found for large enough SO
+strengths. This behavior is signalled by a peak or a cusp, depending on the
+strip width, at intermediate values of beta/alpha in the interval [0,1]. This
+behavior of the spin Hall conductivity was correlated with the one for the
+longitudinal spin conductivity. This study was then extended to the
+out-of-equilibrium regime that arises by imposing a finite voltage bias between
+the two ends of an open strip. This system, in the presence of a Hubbard term
+with coupling U, was treated with the density matrix renormalization group
+technique and with the Landauer-Buttiker formalism. It was found that relevant
+properties to the spin Hall effect, such as the transversal spin current and
+the spin accumulation, present a similar nonmonotonic behavior as the one found
+for the spin conductivities. More importantly, it was also found that these
+properties are enhanced by the repulsive Hubbard interaction up to a moderate
+value of U.",1802.01035v1
+2020-07-20,Tunable spin textures in polar antiferromagnetic hybrid organic inorganic perovskites by electric and magnetic fields,"The hybrid organic inorganic perovskites (HOIPs) have attracted much
+attention for their potential applications as novel optoelectronic devices.
+Remarkably, the Rashba band splitting, together with specific spin orientations
+in k space (i.e., spin texture), has been found to be relevant for the
+optoelectronic performances. In this work, by using first principles
+calculations and symmetry analyses, we study the electric polarization,
+magnetism, and spin texture properties of the antiferromagnetic (AFM) HOIP
+ferroelectric TMCM_MnCl3 (TMCM = (CH3)3NCH2Cl, trimethylchloromethyl ammonium).
+This recently synthesized compound is a prototype of order disorder and
+displacement-type ferroelectric with a large piezoelectric response, high
+ferroelectric transition temperature, and excellent photoluminescence
+properties [You et al., Science 357, 306 (2017)]. The most interesting result
+is that the inversion symmetry breaking coupled to the spin orbit coupling
+gives rise to a Rashba-like band splitting and a related robust persistent spin
+texture (PST) and/or typical spiral spin texture, which can be manipulated by
+tuning the ferroelectric or, surprisingly, also by the AFM magnetic order
+parameter. The tunability of spin texture upon switching of AFM order parameter
+is largely unexplored and our findings not only provide a platform to
+understand the physics of AFM spin texture but also support the AFM HOIP
+ferroelectrics as a promising class of optoelectronic materials.",2007.10016v1
+2017-04-08,Effect of Frustrated Exchange Interactions and Spin-half Impurity on the Electronic Structure of Strongly Correlated NiFe$_{2}$O$_{4}$,"Spin-polarized density functional calculations, magnetization, and neutron
+diffraction measurements are carried out to investigate the magnetic exchange
+interactions and strong correlation effects in Yb substituted inverse spinel
+nickel ferrite. In the pristine form, the compound is found to be a mixed
+insulator under the Zaanen-Sawtazsky-Allen classification scheme as it features
+both charge transfer and Mott insulator mechanism. Estimation of magnetic
+exchange couplings reveals that both octahedral-octahedral and
+octahedral-tetrahedral spin-spin interactions are antiferromagnetic which is
+typical of a spin-frustrated triangular lattice. However, the latter is
+dominant compared to the former leading to a forced parallel alignment of the
+spins at the octahedral site which is in agreement with the results of neutron
+diffraction measurements. The substituent Yb is found to be settled in +3
+charge state, as confirmed from the XPS measurements, to behave like a
+spin-half impurity carried by the localized $f_{z(x^2-y^2)}$ orbital. The
+impurity $f$ spin significantly weakens the antiferromagnetic coupling with the
+spins at the tetrahedral site, which explains the experimental observation of
+fall in Curie temperature with Yb substitution.",1704.02454v2
+2019-12-27,Realizing spin-Hamiltonians in nanoscale active photonic lattices,"Spin models arise in the microscopic description of magnetic materials, where
+the macroscopic characteristics are governed by exchange interactions among the
+constituent magnetic moments. Recently, there has been a growing interest in
+complex systems with spin Hamiltonians, largely due to the rich behaviors
+exhibited by such interactions at the macroscale. Along these lines, it has
+been shown that certain classes of optimization problems involving large
+degrees of freedom can be effectively mapped into classical spin models. In
+this vein, the respective extremum can be found by identifying the ground state
+of the associated spin Hamiltonian. Here, we show both theoretically and
+experimentally, that the cooperative interplay among vectorial electromagnetic
+modes in coupled metallic nanolasers can be utilized as a means to emulate
+certain types of spin-like systems. The ensuing spin exchange interactions are
+in general anisotropic, in a way similar to that encountered in magnetic
+materials involving spin-orbit coupling. For some topologies, we find that
+these active nanophotonic structures are governed by a classical XY Hamiltonian
+that exhibits two phases akin to those associated with ferromagnetic (FM) and
+antiferromagnetic (AF) materials. In addition, we show that in certain
+configurations, the electromagnetic field distribution can undergo geometrical
+frustration, depending on the lattice shape and the transverse resonant modes
+supported by the individual cavity elements. Our results could pave the way
+towards a new scalable nanophotonic platform to study spin exchange
+interactions, that can in turn be potentially exploited to investigate more
+large-scale networks, emulate some magnetic materials, or to address a variety
+of optimization problems.",1912.12075v1
+2021-01-27,Response to Comment on: Tunneling in DNA with Spin Orbit coupling,"The comment by O. Entin-Wohlman, A. Aharony, and Y. Utsumi, on our paper S.
+Varela, I. Zambrano, B. Berche, V. Mujica, and E. Medina, Phys. Rev. B 101,
+241410(R) (2020) makes a few points related to the validity of our model,
+especially in the light of the interpretation of Bardarson's theorem: ""in the
+presence of time reversal symmetry and for half-integral spin the transmission
+eigenvalues of the two terminal scattering matrix come in (Kramers) degenerate
+pairs"". The authors of the comment first propose an ansatz for the wave
+function in the spin active region and go on to show that the resulting
+transmission does not show spin dependence, reasoning that spin dependence
+would violate Bardarson's assertion. Here we clearly show that the ansatz
+presented assumes spin-momentum independence from the outset and thus just
+addresses the spinless particle problem. We then find the appropriate
+eigenfunction contemplating spin-momentum coupling and show that the resulting
+spectrum obeys Bardarson's theorem. Finally we show that the allowed
+wavevectors are the ones assumed in the original paper and thus the original
+conclusions follow. We recognize that the Hamiltonian in our paper written in
+local coordinates on a helix was deceptively simple and offer the expressions
+of how it should be written to more overtly convey the physics involved. The
+relation between spin polarization and torque becomes clear, as described in
+our paper. This response is a very important clarification in relation to the
+implications of Bardarson's theorem concerning the possibility of spin
+polarization in one dimensional systems in the linear regime.",2101.11271v1
+2021-05-06,Tunable spin polarization and electronic structure of bottom-up synthesized MoSi$_2$N$_4$ materials,"Manipulation of spin-polarized electronic states of two-dimensional (2D)
+materials under ambient conditions is necessary for developing new quantum
+devices with small physical dimensions. Here, we explore spin-dependent
+electronic structures of ultra-thin films of recently introduced 2D synthetic
+materials MSi$_2$Z$_4$ (M = Mo or W and Z = N or As) using first-principles
+modeling. Stacking of MSi$_2$Z$_4$ monolayers is found to generate dynamically
+stable bilayer and bulk materials with thickness-dependent properties. When
+spin-orbit coupling (SOC) is included in the computations, MSi$_2$N$_4$
+monolayers display indirect bandgaps and large spin-split states at the $K$ and
+$K'$ symmetry points at the corners of the Brillouin zone with nearly 100\%
+spin polarization. The spins are locked in opposite directions along an
+out-of-the-plane direction at $K$ and $K'$, leading to spin-valley coupling
+effects. As expected, spin polarization is absent in the pristine bilayers due
+to the presence of inversion symmetry, but it can be induced via an external
+out-of-plane electric field much like the case of Mo(W)S$_2$ bilayers. A
+transition from an indirect to a direct bandgap can be driven by replacing N by
+As in MSi$_2$(N, As)$_4$ monolayers. Our study indicates that the MSi$_2$Z$_4$
+materials can provide a viable alternative to the MoS$_2$ class of 2D materials
+for valleytronics and optoelectronics applications.",2105.02739v2
+2022-11-09,Three-carrier spin blockade and coupling in bilayer graphene double quantum dots,"The spin degree of freedom is crucial for the understanding of any condensed
+matter system. Knowledge of spin-mixing mechanisms is not only essential for
+successful control and manipulation of spin-qubits, but also uncovers
+fundamental properties of investigated devices and material. For
+electrostatically-defined bilayer graphene quantum dots, in which recent
+studies report spin-relaxation times T1 up to 50ms with strong magnetic field
+dependence, we study spin-blockade phenomena at charge configuration
+$(1,2)\leftrightarrow(0,3)$. We examine the dependence of the spin-blockade
+leakage current on interdot tunnel coupling and on the magnitude and
+orientation of externally applied magnetic field. In out-of-plane magnetic
+field, the observed zero-field current peak could arise from finite-temperature
+co-tunneling with the leads; though involvement of additional spin- and
+valley-mixing mechanisms are necessary for explaining the persistent sharp side
+peaks observed. In in-plane magnetic field, we observe a zero-field current
+dip, attributed to the competition between the spin Zeeman effect and the
+Kane-Mele spin-orbit interaction. Details of the line shape of this current dip
+however, suggest additional underlying mechanisms are at play.",2211.04882v1
+2016-05-25,Theory of single and two-qubit operations with donor-bound electron spins in germanium,"The possibility of quantum computing with spins in germanium nanoscale
+transistors has recently attracted interest since it promises highly tuneable
+qubits that have encouraging coherence times. We here present the first
+complete theory of the orbital states of Ge donor electrons, and use it to show
+that Ge could have significant advantages over silicon in the implementation of
+a donor-based quantum processor architecture. We show that the stronger
+spin-orbit interaction and the larger electron donor wave functions for Ge
+donors allow for greater tuning of the single qubit energy than for those in Si
+crystals, thus enabling a large speedup of selective (local) quantum gates.
+Further, exchange coupling between neighboring donor qubits is shown to be much
+larger in Ge than in Si, and we show that this greatly relaxes the precision in
+donor placement needed for robust two-qubit gates. To do this we compare two
+statistical distributions for Ge:P and Si:P pair couplings, corresponding to
+realistic donor implantation misplacement, and find that the spin couplings in
+Ge:P have a $33\%$ chance of being within an order of magnitude of the largest
+coupling, compared with only $10\%$ for the Si:P donors. This allows fast,
+parallel and robust architectures for quantum computing with donors in Ge.",1605.07831v1
+2017-07-11,Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures,"Despite its extremely weak intrinsic spin-orbit coupling (SOC), graphene has
+been shown to acquire considerable SOC by proximity coupling with exfoliated
+transition metal dichalcogenides (TMDs). Here we demonstrate strong induced
+Rashba SOC in graphene that is proximity coupled to a monolayer TMD film, MoS2
+or WSe2, grown by chemical vapor deposition with drastically different Fermi
+level positions. Graphene/TMD heterostructures are fabricated with a
+pickup-transfer technique utilizing hexagonal boron nitride, which serves as a
+flat template to promote intimate contact and therefore a strong interfacial
+interaction between TMD and graphene as evidenced by quenching of the TMD
+photoluminescence. We observe strong induced graphene SOC that manifests itself
+in a pronounced weak anti-localization (WAL) effect in the graphene
+magnetoconductance. The spin relaxation rate extracted from the WAL analysis
+varies linearly with the momentum scattering time and is independent of the
+carrier type. This indicates a dominantly Dyakonov-Perel spin relaxation
+mechanism caused by the induced Rashba SOC. Our analysis yields a Rashba SOC
+energy of ~1.5 meV in graphene/WSe2 and ~0.9 meV in graphene/MoS2,
+respectively. The nearly electron-hole symmetric nature of the induced Rashba
+SOC provides a clue to possible underlying SOC mechanisms.",1707.03434v1
+2022-07-07,"Intensities of KCs $E(4)^1Σ^+\to (a^3Σ^+,X^1Σ^+)$ band system up to dissociation threshold: an interplay between spin-orbit, hyperfine and rovibronic coupling effects","The relative intensity distribution in the rotationally resolved
+laser-induced fluorescence spectra belonging to the $E(4)^1\Sigma^+\to
+(a^3\Sigma^+_1,X^1\Sigma^+)$ band systems of the KCs molecule was analyzed. The
+experimental intensities in doublet $P$,$R$ progressions assigned to
+spin-allowed $E\to X$ and spin-forbidden $E\to a$ transitions up to their
+common ground dissociation limit were described in the framework of a
+coupled-channels (CC) deperturbation model applied for the interacting \Xstate\
+and \astate\ states. The CC intensity simulation was based solely on fixed
+electronic structure parameters as functions of the internuclear distance $R$,
+namely: accurate empirical potential energy curves for all three states,
+\emph{ab initio} estimates for matrix elements $A(R)$ of the hyperfine
+structure (HFS) , and transition dipole moments $d_{EX}(R)$ and $d_{Ea}(R)$. A
+comparison between the measured intensities and their theoretical counterparts
+demonstrates a strong competition between different intramolecular
+interactions. A weak spin-orbit coupling of the upper \Estate\ state with the
+remote $^3\Pi$ states is responsible for appearance of the $E\to a$ vibrational
+bands for the intermediate $v_a$-values. In turn, the HFS coupling between
+\Xstate\ and \astate\ states leads to peculiarities in $E\to (X,a)$
+intensities, which are pronounced for high $v_{X/a}$-values in the vicinity of
+K(4$^2S$)+Cs(6$^2S$) dissociation threshold. Both adiabatic ro-vibrational and
+non-adiabatic electronic-rotational interactions explain the abrupt deviation
+of some observed $P/R$ intensity ratios from the expected H\""{o}nl-London
+factors.",2207.03237v1
+2002-10-31,Can the Spin-Orbit Interaction Break the Channel Degeneracy of the Two-Channel Orbital Kondo Problem?,"Two-level systems (TLS) interacting with conduction electrons are possibly
+described by the two-channel Kondo Hamiltonian. In this case the channel
+degeneracy is due to the real spin of the electrons. The possibility of
+breaking that degeneracy has interest on his own. In fact, we show that the
+interaction of the conduction electrons with a spin-orbit scatterer nearby the
+TLS leads to the breaking of the channel degeneracy only in the case of
+electron-hole symmetry breaking. The generated channel symmetry breaking
+TLS-electron couplings are, however, too weak to result in any observable
+effects. Our analysis is also relevant for heavy fermion systems.",0210709v1
+2005-02-11,SU(4) versus SU(2) Kondo effect in double quantum dot,"We consider the spin and orbital Kondo effect in a parallel arrangement of
+two strongly electrostatically coupled quantum dots. Increasing the exchange of
+electrons between the dots through the attached leads induces the transition
+between the SU(4) spin- and orbital Kondo effect and SU(2) spin Kondo effect.
+Being the same for the SU(4) and SU(2) symmetry points, the Kondo temperature
+drops slightly in the intermediate regime. Experimentally, two kinds of Kondo
+effects can be discriminated by the sensitivity to the suppression of the spin
+Kondo effect by Zeeman field. The dependence of Kondo temperature on Zeeman
+field and the strength of electronic exchange mediated by the leads is analyzed
+in detail.",0502282v2
+2005-12-16,Orbital Ordering and Spin-Ladder Formation in La2RuO5,"The semiconductor-semiconductor transition of La2RuO5 is studied by means of
+augmented spherical wave (ASW) electronic structure calculations as based on
+density functional theory and the local density approximation. This transition
+has lately been reported to lead to orbital ordering and a quenching of the
+local spin magnetic moment. Our results hint towards an orbital ordering
+scenario which, markedly different from the previously proposed scheme,
+preserves the local S = 1 moment at the Ru sites in the low-temperature phase.
+The unusual magnetic behaviour is interpreted by the formation of spin-ladders,
+which result from the structural changes occurring at the transition and are
+characterized by antiferromagnetic coupling along the rungs.",0512409v1
+2006-05-22,Quantum Monte Carlo study for multiorbital systems with preserved spin and orbital rotational symmetries,"We propose to combine the Trotter decomposition and a series expansion of the
+partition function for Hund's exchange coupling in a quantum Monte Carlo (QMC)
+algorithm for multiorbital systems that preserves spin and orbital rotational
+symmetries. This enables us to treat the Hund's (spin-flip and pair-hopping)
+terms, which is difficult in the conventional QMC method. To demonstrate this,
+we first apply the algorithm to study ferromagnetism in the two-orbital Hubbard
+model within the dynamical mean-field theory (DMFT). The result reveals that
+the preservation of the SU(2) symmetry in Hund's exchange is important, where
+the Curie temperature is grossly overestimated when the symmetry is degraded,
+as is often done, to Ising (Z$_2$). We then calculate the $t_{2g}$ spectral
+functions of Sr$_2$RuO$_4$ by a three-band DMFT calculation with tight-binding
+parameters taken from the local density approximation with proper rotational
+symmetry.",0605526v2
+2004-10-14,Chiral SU(3) dynamics and $Λ$-hyperons in the nuclear medium,"We present a novel approach to the density dependent mean field and the
+spin-orbit interaction of a $\Lambda$-hyperon in a nuclear many-body system,
+based on flavor-SU(3) in-medium chiral perturbation theory. The leading
+long-range $\Lambda N$-interaction arises from kaon exchange and from two-pion
+exchange with a $\Sigma$-hyperon in the intermediate state. The empirical
+$\Lambda$-nucleus potential depth of about $-28 $MeV is well reproduced with a
+single cutoff scale, $\bar \Lambda = 0.7 $GeV, effectively representing all
+short-distance (high-momentum) dynamics not resolved at scales characteristic
+of the nuclear Fermi momentum. This value of $\bar\Lambda$ is remarkably
+consistent with the one required to reproduce the empirical saturation point of
+isospin-symmetric nuclear matter in the same framework. The smallness of the
+$\Lambda$-nuclear spin-orbit interaction finds a natural (yet novel)
+explanation in terms of an almost complete cancellation between short-range
+contributions (properly rescaled from the known nucleonic spin-orbit coupling
+strength) and long-range terms generated by iterated one-pion exchange with
+intermediate $\Sigma$-hyperons. The small $\Sigma\Lambda$-mass difference
+figures prominently in this context.",0410062v2
+2006-05-03,Critical Survey of Isoscalar and Isovector Contributions to the Spin Orbit Potential in Relativistic Mean Field Theory,"The spin-orbit (SO) interaction, emerging naturally from the Relativistic
+Mean Field (RMF) theory is examined critically in the light of the recently
+measured excitation energy differences between the terminating states built on
+two different configurations for nuclei belonging to the lower pf shell. The
+calculations are carried out using the cranked RMF framework. To further probe
+the iso-vector dependence of the spin-orbit potential, the energy spacing
+between the g_{7/2} and h_{11/2} states in the Sb-chain is compared to
+experiment. It is found that the calculation at the quantitative level deviates
+strongly from the experiment. In particular the balance of the iso-scalar and
+iso-vector strengths of the effective one body SO potential indicates that
+additional terms like tensor couplings may be needed to account for the
+experimental data.",0605009v4
+1999-09-07,Spin-orbit pendulum - Relativistic extension,"We discuss an extension of the theory of {\em spin-orbit pendulum} phenomenon
+given in [1] to relativistic approach. It is done within the so called Dirac
+Oscillator. Our first results, focusing on circular wave packet motion have
+been published recently [2]. The scope of this paper is motion of a linear wave
+packet. In relativistic approach we found {\em Zitterbewegung} in spin-orbit
+motion (in Dirac representation) due to coupling to negative energy states.
+This effect is washed out in the Foldy-Wouthuysen representation. Another
+important change with respect to non-relativistic case is the loss of
+periodicity. The phenomenon reminds the time evolution of population inversion
+in Jaynes-Cummings model.",9909023v1
+2007-04-05,The tensor part of the Skyrme energy density functional. I. Spherical nuclei,"We perform a systematic study of the impact of the J^2 tensor term in the
+Skyrme energy functional on properties of spherical nuclei. In the Skyrme
+energy functional, the tensor terms originate both from zero-range central and
+tensor forces. We build a set of 36 parameterizations, which covers a wide
+range of the parameter space of the isoscalar and isovector tensor term
+coupling constants, with a fit protocol very similar to that of the successful
+SLy parameterizations. We analyze the impact of the tensor terms on a large
+variety of observables in spherical mean-field calculations, such as the
+spin-orbit splittings and single-particle spectra of doubly-magic nuclei, the
+evolution of spin-orbit splittings along chains of semi-magic nuclei, mass
+residuals of spherical nuclei, and known anomalies of charge radii. Our main
+conclusion is that the currently used central and spin-orbit parts of the
+Skyrme energy density functional are not flexible enough to allow for the
+presence of large tensor terms.",0704.0731v3
+2007-04-24,Enhanced spin-orbit scattering length in narrow Al_xGa_{1-x}N/GaN wires,"The magnetotransport in a set of identical parallel AlGaN/GaN quantum wire
+structures was investigated. The width of the wires was ranging between 1110 nm
+and 340 nm. For all sets of wires clear Shubnikov--de Haas oscillations are
+observed. We find that the electron concentration and mobility is approximately
+the same for all wires, confirming that the electron gas in the AlGaN/GaN
+heterostructure is not deteriorated by the fabrication procedure of the wire
+structures. For the wider quantum wires the weak antilocalization effect is
+clearly observed, indicating the presence of spin-orbit coupling. For narrow
+quantum wires with an effective electrical width below 250 nm the weak
+antilocalization effect is suppressed. By comparing the experimental data to a
+theoretical model for quasi one-dimensional structures we come to the
+conclusion that the spin-orbit scattering length is enhanced in narrow wires.",0704.3146v2
+2008-03-03,X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6,"Using x-ray absorption spectroscopy at the Rh-L_2,3, Co-L_2,3, and Fe-L_2,3
+edges, we find a valence state of Co^2+/Rh^4+ in Ca3CoRhO6 and of Fe^3+/Rh^3+
+in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the Co-L_2,3
+edge of Ca3CoRhO6 reveals a giant orbital moment of about 1.7mu_B, which can be
+attributed to the occupation of the minority-spin d_0d_2 orbital state of the
+high-spin Co^2+ (3d^7) ions in trigonal prismatic coordination. This active
+role of the spin-orbit coupling explains the strong magnetocrystalline
+anisotropy and Ising-like magnetism of Ca3CoRhO6.",0803.0293v1
+2008-05-01,Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors,"A two-orbital model for Fe-pnictide superconductors is investigated using
+computational techniques on two-dimensional square clusters. The hopping
+amplitudes are derived from orbital overlap integrals, or by band structure
+fits, and the spin frustrating effect of the plaquette-diagonal Fe-Fe hopping
+is remarked. A spin 'striped' state is stable in a broad range of couplings in
+the undoped regime, in agreement with neutron scattering. Adding two electrons
+to the undoped ground state of a small cluster, the dominant pairing operators
+are found. Depending on parameters, two pairing operators were identified: they
+involve inter-xz-yz orbital combinations forming spin singlets or triplets,
+transforming according to the B_2g and A_2g representations of the D_4h group,
+respectively.",0805.0148v4
+2009-01-24,Role of spin orbit coupling and electron correlation in the ground state properties of 5d electronic states,"Electron correlation strength is predicted to be weak in 5d transition metal
+oxides and hence, various anomalous electronic properties observed in these
+systems are often attributed to the large spin-orbit interaction strength.
+Employing first principles approaches, we studied the electronic structure of
+Y2Ir2O7, which is insulating and exhibits ferromagnetic phase below 150 K. The
+results reveal breakdown of both the above paradigms. The role of spin-orbit
+interaction is found to be marginal in determining the ground state properties
+of Y2Ir2O7. A large electron correlation strength is required to derive the
+experimental bulk spectrum that is consistent with the bulk properties.",0901.3847v2
+2009-08-17,Spin-orbit splittings in Si/SiGe quantum wells,"We present a calculation of the wavevector-dependent subband level splitting
+from spin-orbit coupling in Si/SiGe quantum wells. We first use the
+effective-mass approach, where the splittings are parameterized by separating
+contributions from the Rashba and Dresselhaus terms. We then determine the
+parameters by fitting tight-binding numerical results obtained using the
+quantitative nanoelectronic modeling tool, NEMO-3D. We describe the relevant
+parameters as a function of applied electric field and well width in our
+numerical simulations. For a silicon membrane, we find the bulk Rashba
+parameter to be linear in field, $\alpha = \alpha^1E_z$ with $\alpha^1 \simeq
+2\times$ 10 $^{-5}$nm$^{-2}$. The dominant contribution to the spin-orbit
+splitting is from Dresselhaus-type terms, and the magnitude for a typical flat
+SiGe/Si/SiGe quantum well can be as high as 1$\mu$eV.",0908.2417v1
+2009-10-20,Correlated band theory of spin and orbital contributions to Dzyaloshinskii-Moriya interactions,"A new approach for calculations of Dzyaloshinskii-Moriya interactions in
+molecules and crystals is proposed. It is based on the exact perturbation
+expansion of total energy of weak ferromagnets in the canting angle with the
+only assumption of local Hubbard-type interactions. This scheme leads to a
+simple and transparent analytical expression for Dzyaloshinskii-Moriya vector
+with a natural separation into spin and orbital contributions. The main problem
+was transferred to calculations of effective tight-binding parameters in the
+properly chosen basis including spin-orbit coupling. Test calculations for
+La$_2$CuO$_4$ give the value of canting angle in a good agreement with
+experimental data.",0910.3748v2
+2010-10-19,Anomalous Cherenkov spin-orbit sound,"The Cherenkov effect is a well known phenomenon in the electrodynamics of
+fast charged particles passing through transparent media. If the particle is
+faster than the light in a given medium, the medium emits a forward light cone.
+This beautiful phenomenon has an acoustic counterpart where the role of photons
+is played by phonons and the role of the speed of light is played by the sound
+velocity. In this case the medium emits a forward sound cone. Here, we show
+that in a system with spin-orbit interactions in addition to this {\it normal}
+Cherenkov sound there appears an {\it anomalous} Cherenkov sound with forward
+and {\it backward} sound propagation. Furthermore, we demonstrate that the
+transition from the normal to anomalous Cherenkov sound happens in a {\it
+singular} way at the Cherenkov cone angle. The detection of this acoustic
+singularities therefore represents an alternative experimental tool for the
+measurement of the spin-orbit coupling strength.",1010.4002v2
+2010-12-22,Probing photo-induced melting of antiferromagnetic order in La0.5Sr1.5MnO4 by ultrafast resonant soft X-ray diffraction,"Photo-excitation in complex oxides1 transfers charge across semicovalent
+bonds, drastically perturbing spin and orbital orders2. Light may then be used
+in compounds like magnetoresistive manganites to control magnetism on nanometre
+lengthscales and ultrafast timescales. Here, we show how ultrafast resonant
+soft x-ray diffraction can separately probe the photo-induced dynamics of spin
+and orbital orders in La0.5Sr1.5MnO4. Ultrafast melting of CE antiferromagnetic
+spin order is evidenced by the disappearance of a (1/4,1/4,1/2) diffraction
+peak. On the other hand the (1/4,1/4,0) peak, reflecting orbital order, is only
+partially reduced. Cluster calculations aid our interpretation by considering
+different magnetically ordered states accessible after photo-excitation.
+Nonthermal coupling between light and magnetism emerges as a primary aspect of
+photo-induced phase transitions in manganites.",1012.4960v2
+2011-03-12,Non-Abelian quantum holonomy of hydrogen-like atoms,"We study the Uhlmann holonomy [Rep. Math. Phys. 24, 229 (1986)] of quantum
+states for hydrogen-like atoms where the intrinsic spin and orbital angular
+momentum are coupled by the spin-orbit interaction and subject to a slowly
+varying magnetic field. We show that the holonomy for the orbital angular
+momentum and spin subsystems is non-Abelian, while the holonomy of the whole
+system is Abelian. Quantum entanglement in the states of the whole system is
+crucially related to the non-Abelian gauge structure of the subsystems. We
+analyze the phase of the Wilson loop variable associated with the Uhlmann
+holonomy, and find a relation between the phase of the whole system with
+corresponding marginal phases. Based on the result for the model system we
+provide evidence that the phase of the Wilson loop variable and the mixed-state
+geometric phase [E. Sj\""oqvist {\it et al.} Phys. Rev. Lett. 85, 2845 (2000)]
+are in general inequivalent.",1103.2435v2
+2011-03-26,Precision control of charge coherence in parallel double dot systems through spin-orbit interaction,"In terms of the exact quantum master equation solution for open electronic
+systems, the coherent dynamics of two charge states described by two parallel
+quantum dots with one fully polarized electron on either dot is investigated in
+the presence of spin-orbit interaction. We demonstrate that the double dot
+system can stay in a dynamically decoherence free space. The coherence between
+two double dot charge states can be precisely manipulated through a spin-orbit
+coupling. The effects of the temperature, the finite bandwidth of lead, and the
+energy deviations during the coherence manipulation are also explored.",1103.5099v2
+2011-07-08,Orbital-Angular-Momentum Based Origin of Rashba-Type Surface Band Splitting,"We propose that existence of local orbital angular momentum (OAM) on the
+surfaces of high-Z materials play a crucial role in the formation of
+Rashba-type surface band splitting. Local OAM state in a Bloch state produces
+asymmetric charge distribution (electric dipole). Presence of surface electric
+field aligns the electric dipole and results in chiral OAM states and the
+relevant Rashba- type splitting. Therefore, the band splitting originates from
+electric dipole interaction, not from the Zeeman splitting as proposed in the
+original Rashba picture. The characteristic spin chiral structure of Rashba
+states is formed through the spin-orbit coupling and thus is a secondary effect
+to the chiral OAM. Results from first principles calculations on a single Bi
+layer under an external electric field verify the key predictions of the new
+model, including the direction of the spin textures which is predicted to be in
+opposite direction in the Rashba picture.",1107.1554v2
+2011-09-12,Existence of bulk chiral fermions and crystal symmetry,"We consider the existence of bulk chiral fermions around points of symmetry
+in the Brillouin zone of nonmagnetic 3D crystals with negligible spin-orbit
+interactions. We use group theory to show that this is possible, but only for a
+reduced number of space groups and points of symmetry that we tabulate.
+Moreover, we show that for a handful of space groups the existence of bulk
+chiral fermions is not only possible but unavoidable, irrespective of the
+concrete crystal structure. Thus our tables can be used to look for bulk chiral
+fermions in a specific class of systems, namely that of nonmagnetic 3D crystals
+with sufficiently weak spin-orbit coupling. We also discuss the effects of
+spin-orbit interactions and possible extensions of our approach to Weyl
+semimetals, crystals with magnetic order, and systems with Dirac points with
+pseudospin 1 and 3/2. A simple tight-binding model is used to illustrate some
+of the issues.",1109.2581v3
+2012-09-06,Giant Anisotropy of Spin-Orbit Splitting at the Bismuth Surface,"We investigate the bismuth (111) surface by means of time and angle resolved
+photoelectron spectroscopy. The parallel detection of the surface states below
+and above the Fermi level reveals a giant anisotropy of the Spin-Orbit (SO)
+spitting. These strong deviations from the Rashba-like coupling cannot be
+treated in $\textbf{k}\cdot \textbf{p}$ perturbation theory. Instead, first
+principle calculations could accurately reproduce the experimental dispersion
+of the electronic states. Our analysis shows that the giant anisotropy of the
+SO splitting is due to a large out-of plane buckling of the spin and orbital
+texture.",1209.1219v2
+2012-09-26,Z_2-vortex lattice in the ground state of the triangular Kitaev-Heisenberg model,"The triangular-lattice Heisenberg antiferromagnet (HAF) is known to carry
+topological Z_2 vortex excitations which form a gas at finite temperatures.
+Here we show that the spin-orbit interaction, introduced via a Kitaev term in
+the exchange Hamiltonian, condenses these vortices into a triangular $Z_2$
+vortex crystal at zero temperature. The cores of the Z_2 vortices show abrupt,
+soliton-like magnetization modulations and arise by a special intertwining of
+three honeycomb superstructures of ferromagnetic domains, one for each of the
+three sublattices of the 120-degree state of the pure HAF. This is a new
+example of a nucleation transition, analogous to the spontaneous formation of
+magnetic domains, Abrikosov vortices in type-II syperconductors, blue phases in
+cholesteric liquid crystals, and skyrmions in chiral helimagnets. As the
+mechanism relies on the interplay of geometric frustration and spin-orbital
+anisotropies, such vortex mesophases can materialize as a ground-state property
+in spin-orbit coupled correlated systems with nearly hexagonal topology, as in
+triangular or strongly frustrated honeycomb iridates.",1209.5895v3
+2013-01-30,Resonance Features of the Conductance of Open Billiards with the Spin-Orbit Interaction,"The transport properties of a circular billiard with attached channels, which
+is an open system, have been studied in the presence of the Dresselhaus and
+Rashba spin-orbit interactions. It has been shown that this interaction leads
+to the appearance of additional Fano resonances in the energy dependence of the
+conductance, the width of which is proportional to the fourth power of the
+spin-orbit coupling constant.",1301.7219v2
+2013-06-18,"Effect of spin-orbit interaction on the excitonic effects in single-layer, double-layer, and bulk MoS2","We present converged ab-initio calculations of the optical absorption spectra
+of single-layer, bi-layer, and bulk MoS$_2$. Both the quasiparticle-energy
+calculations (on the level of the GW approximation) and the calculation of the
+absorption spectra (on the level of the Bethe-Salpeter equation) explicitly
+include spin-orbit coupling, using the full spinorial Kohn-Sham wave-functions
+as input. Without excitonic effects, the absorption spectra would have the form
+of a step-function, corresponding to the joint-density of states of a parabolic
+band-dispersion in 2D. This profile is deformed by a pronounced bound excitonic
+peak below the continuum onset. The peak is split by spin-orbit interaction in
+the case of single-layer and (mostly) by inter-layer interaction in the case of
+double-layer and bulk MoS$_2$. The resulting absorption spectra are thus very
+similar in the three cases but the interpretation of the spectra is different.
+Differences in the spectra can be seen around 3 eV where the spectra of single
+and double-layer are dominated by a strongly bound exciton.",1306.4257v2
+2014-04-02,Controllable Rashba spin-orbit interaction in artificially engineered superlattices involving the heavy-fermion superconductor CeCoIn5,"By using a molecular beam epitaxy technique, we fabricate a new type of
+superconducting superlattices with controlled atomic layer thicknesses of
+alternating blocks between heavy fermion superconductor CeCoIn_5, which
+exhibits a strong Pauli pair-breaking effect, and nonmagnetic metal YbCoIn_5.
+The introduction of the thickness modulation of YbCoIn_5 block layers breaks
+the inversion symmetry centered at the superconducting block of CeCoIn_5. This
+configuration leads to dramatic changes in the temperature and angular
+dependence of the upper critical field, which can be understood by considering
+the effect of the Rashba spin-orbit interaction arising from the inversion
+symmetry breaking and the associated weakening of the Pauli pair-breaking
+effect. Since the degree of thickness modulation is a design feature of this
+type of superlattices, the Rashba interaction and the nature of pair-breaking
+are largely tunable in these modulated superlattices with strong spin-orbit
+coupling.",1404.0482v1
+2015-03-31,Formation of Molecular-Orbital Bands in a Twisted Hubbard Tube: Implications for Unconventional Superconductivity in K2Cr3As3,"We study a twisted Hubbard tube modeling the [CrAs] structure of
+quasi-one-dimensional superconductors A2Cr3As3 (A = K, Rb, Cs). The
+molecular-orbital bands emerging from the quasi-degenerate atomic orbitals are
+exactly solved. An effective Hamiltonian is derived for a region where three
+partially filled bands intersect the Fermi energy. The deduced local
+interactions among these active bands show a significant reduction compared to
+the original atomic interactions. The resulting three-channel Luttinger liquid
+shows various interaction-induced instabilities including two kinds of
+spin-triplet superconducting instabilities due to gapless spin excitations,
+with one of them being superseded by the spin-density-wave phase in the
+intermediate Hund's coupling regime. The implications of these results for the
+alkali chromium arsenides are discussed.",1503.08965v2
+2015-10-07,Optimizing spin-orbit splittings in InSb Majorana nanowires,"Semiconductor-superconductor heterostructures represent a promising platform
+for the detection of Majorana zero modes and subsequently the processing of
+quantum information using their exotic non-Abelian statistics. Theoretical
+modeling of such low-dimensional semiconductors is generally based on
+phenomenological effective models. However, a more microscopic understanding of
+their band structure and, especially, of the spin-orbit coupling of electrons
+in these devices is important for optimizing their parameters for applications
+in quantum computing. In this paper, we approach this problem by first
+obtaining a highly accurate effective tight-binding model from ab initio
+calculations in the bulk. This model is symmetrized and correctly reproduces
+both the band structure and the wavefunction character. It is then used to
+determine Dresselhaus and Rashba spin-orbit splittings induced by finite size
+effects and external electric field in zincblende InSb one- and two-dimensional
+nanostructures as a function of growth parameters. The method presented here
+enables reliable simulations of realistic devices, including those used to
+realize exotic topological states.",1510.02025v2
+2015-11-16,On the ferromagnetic ground state of SmN,"SmN is a ferromagnetic semiconductor with the unusual property of an
+orbital-dominant magnetic moment that is largely cancelled by an antiparallel
+spin contribution, resulting in a near-zero net moment. However, there is a
+basic gap in the understanding of the ferromagnetic ground state, with existing
+density functional theory calculations providing values of the $4f$ magnetic
+moments at odds with experimental data. To clarify the situation, we employ an
+effective $4f$ Hamiltonian incorporating spin-orbit coupling, exchange, the
+crystal field, and $J$-mixing to calculate the ground state $4f$ moments. Our
+results are in excellent agreement with experimental data, revealing moderate
+quenching of both spin and orbital moments to magnitudes of $\sim 2~\mu_B$ in
+bulk SmN, enhanced to an average of $\sim 3~\mu_B$ in SmN layers within a
+SmN/GdN superlattice. These calculations provide insight into recent studies of
+SmN showing that it is an unconventional superconductor at low temperatures and
+displays twisted magnetization phases in magnetic heterostructures.",1511.04820v1
+2016-02-25,Mesoscopic Superposition States Generated by Synthetic Spin-orbit Interaction in Fock-state Lattices,"Mesoscopic superposition states of photons can be prepared in three cavities
+interacting with the same two-level atom. By periodically modulating the three
+cavity frequencies around the transition frequency of the atom with $2\pi/3$
+phase difference, the time reversal symmetry is broken and an optical
+circulator is generated with chiralities depending on the quantum state of the
+atom. A superposition of the atomic states can guide photons from one cavity to
+a mesoscopic superposition of the other two cavities. The physics can be
+understood in a finite spin-orbit-coupled Fock-state lattice where the atom and
+the cavities carry the spin and the orbit degrees of freedom, respectively.
+This scheme can be realized in circuit QED architectures and provides a new
+platform for exploring quantum information and topological physics in novel
+lattices.",1602.08009v3
+2018-02-08,Exotic Magnetism and Spin-Orbit Assisted Mott Insulating State in a $3d-5d$ Double Perovskite,"The magnetic structure of Ca$_2$MnReO$_6$ double perovskite is investigated
+by neutron powder diffraction and bulk magnetization, showing dominant
+non-collinear Mn magnetic moments [$4.35(7)$ $\mu_B$] that are orthogonally
+aligned with the small Re moments [$0.22(4)$ $\mu_B$]. $Ab$-initio electronic
+structure calculations show that the strong spin-orbit coupling for Re $5d$
+electrons combined with a relatively modest on-site Coulomb repulsion
+($U_{eff}^{Re} \gtrsim 0.6$ eV) is sufficient to render this material
+insulating. This is a rare example of spin-orbit assisted Mott insulator
+outside the realm of iridates, with remarkable magnetic properties.",1802.02815v1
+2018-11-09,Switching of biaxial synthetic antiferromagnets: a micromagentic study,"We simulate the switching behavior of nanoscale synthetic antiferromagnets
+(SAFs), inspired by recent experimental progress in spin-orbit-torque switching
+of crystal antiferromagnets. The SAF consists of two ferromagnetic thin films
+with in-plane biaxial anisotropy and interlayer exchange coupling. Staggered
+field-like Rashba spin-orbit torques from the opposite surfaces of the SAF
+induce a canted net magnetization, which triggers an orthogonal torque that
+drives 90$^\circ$ switching of the N\'eel vector. Such dynamics driven by the
+field-like spin-orbit torque allows for faster switching with increased Gilbert
+damping, without a significant detrimental increase of the threshold switching
+current density. Our results point to the potential of SAFs as model systems,
+based on simple ferromagnetic metals, to mimic antiferromagnetic device
+physics.",1811.04094v2
+2009-12-18,Tunable Rashba spin-orbit interaction at oxide interfaces,"The quasi-two-dimensional electron gas found at the LaAlO3/SrTiO3 interface
+offers exciting new functionalities, such as tunable superconductivity, and has
+been proposed as a new nanoelectronics fabrication platform. Here we lay out a
+new example of an electronic property arising from the interfacial breaking of
+inversion symmetry, namely a large Rashba spin-orbit interaction, whose
+magnitude can be modulated by the application of an external electric field. By
+means of magnetotransport experiments we explore the evolution of the
+spin-orbit coupling across the phase diagram of the system. We uncover a steep
+rise in Rashba interaction occurring around the doping level where a quantum
+critical point separates the insulating and superconducting ground states of
+the system.",0912.3731v1
+2011-11-11,Subband structure of a two-dimensional electron gas formed at the polar surface of the strong spin-orbit perovskite KTaO$_3$,"We demonstrate the formation of a two-dimensional electron gas (2DEG) at the
+$(100)$ surface of the $5d$ transition-metal oxide KTaO$_3$. From
+angle-resolved photoemission, we find that quantum confinement lifts the
+orbital degeneracy of the bulk band structure and leads to a 2DEG composed of
+ladders of subband states of both light and heavy carriers. Despite the strong
+spin-orbit coupling, our measurements provide a direct upper bound for
+potential Rashba spin splitting of only $\Delta{k}_\parallel\sim\0.02$
+\AA$^{-1}$ at the Fermi level. The polar nature of the KTaO$_3(100)$ surface
+appears to help mediate formation of the 2DEG as compared to non-polar
+SrTiO$_3(100)$.",1111.2782v1
+2012-04-26,"Investigations of the EPR parameters for the tetrahedral [FeX_4]^- clusters in AgX (X=Cl, Br)","The EPR parameters g factors and the superhyperfine parameters for the
+tetrahedral [FeX_4]^- clusters in AgX (X=Cl, Br) are theoretically investigated
+from the perturbation formulas of these parameters for a 3d^5 ion under
+tetrahedra by considering both the crystal-field and charge transfer
+contributions. The related model parameters are quantitatively determined from
+the cluster approach in a uniform way. The g-shift \Delta g (=g-g_s, where
+g_s\approx 2.0023 is the spin only value) from the charge transfer contribution
+is opposite (positive) in sign and much larger in magnitude as compared with
+that from the crystal-field one. The importance of the charge transfer
+contribution increases rapidly with increasing the covalency and the spin-orbit
+coupling coefficient of the ligand and thus exhibits the order of AgCl<AgBr.
+The unpaired spin densities of the halogen ns, np\sigma\ and np\pi\ orbitals
+are quantitatively determined from the related molecular orbital coefficients
+based on the cluster approach.",1204.5996v1
+2015-12-30,Character of Matter in Holography: Spin-Orbit Interaction,"Gauge/Gravity duality as a theory of matter needs a systematic way to
+characterise a system. We suggest a `dimensional lifting' of the least
+irrelevant interaction to the bulk theory. As an example, we consider the
+spin-orbit interaction, which causes magneto-electric interaction term. We show
+that its lifting is an axionic coupling. We present an exact and analytic
+solution describing diamagnetic response. Experimental data on annealed
+graphite shows a remarkable similarity to our theoretical result. We also find
+an analytic formulas of DC transport coefficients, according to which, the
+anomalous Hall coefficient interpolates between the coherent metallic regime
+with $\rho_{xx}^{2}$ and incoherent metallic regime with $\rho_{xx}$ as we
+increase the disorder parameter $\beta$. The strength of the spin-orbit
+interaction also interpolates between the two scaling regimes.",1512.08916v1
+2016-05-18,Sensitivity of Λ single-particle energies to the ΛN spin-orbit coupling and to nuclear core structure in p-shell and sd-shell hypernuclei,"We introduce a mean field model based on realistic 2-body baryon interactions
+and calculate spectra of a set of p-shell and sd-shell {\Lambda} hypernuclei -
+13{\Lambda}C, 17{\Lambda}O, 21{\Lambda}Ne, 29{\Lambda}Si and 41{\Lambda}Ca. The
+hypernuclear spectra are compared with the results of a relativistic mean field
+(RMF) model and available experimental data. The sensitivity of {\Lambda}
+single-particle energies to the nuclear core structure is explored. Special
+attention is paid to the effect of spin-orbit {\Lambda}N interaction on the
+energy splitting of the {\Lambda} single particle levels 0p3/2 and 0p1/2. In
+particular, we analyze the contribution of the symmetric (SLS) and the
+anti-symmetric (ALS) spin-orbit terms to the energy splitting. We give
+qualitative predictions for the calculated hypernuclei.",1605.05646v1
+2017-06-08,Writing and Reading antiferromagnetic Mn$_2$Au: Néel spin-orbit torques and large anisotropic magnetoresistance,"Antiferromagnets are magnetically ordered materials which exhibit no net
+moment and thus are insensitive to magnetic fields. Antiferromagnetic
+spintronics aims to take advantage of this insensitivity for enhanced
+stability, while at the same time active manipulation up to the natural THz
+dynamic speeds of antiferromagnets is possible, thus combining exceptional
+storage density and ultra-fast switching. However, the active manipulation and
+read-out of the N\'eel vector (staggered moment) orientation is challenging.
+Recent predictions have opened up a path based on a new spin-orbit torque,
+which couples directly to the N\'eel order parameter. This N\'eel spin-orbit
+torque was first experimentally demonstrated in a pioneering work using
+semimetallic CuMnAs. Here we demonstrate for Mn$_2$Au, a good conductor with a
+high ordering temperature suitable for applications, reliable and reproducible
+switching using current pulses and readout by magnetoresistance measurements.
+The symmetry of the torques agrees with theoretical predictions and a large
+read-out magnetoresistance effect of more than $\simeq 6$~$\%$ is reproduced by
+ab initio transport calculations.",1706.02482v1
+2018-09-17,Ultrafast dynamics of spin and orbital correlations in quantum materials: an energy- and momentum-resolved perspective,"Many remarkable properties of quantum materials emerge from states with
+intricate coupling between the charge, spin and orbital degrees of freedom.
+Ultrafast photo-excitations of these materials hold great promise for
+understanding and controlling the properties of these states. Here we introduce
+time-resolved resonant inelastic X-ray scattering (trRIXS) as a means of
+measuring charge, spin and orbital excitations out of equilibrium. These
+excitations encode the correlations and interactions that determine the
+detailed properties of the states generated. After outlining the basic
+principles and instrumentation of tr-RIXS, we review our first observations of
+transient antiferromagnetic correlations in quasi-two dimensions in a
+photo-excited Mott insulator and present possible future routes of this
+fast-developing technique. The increasing number of X-ray free electron laser
+facilities not only enables tackling long-standing fundamental scientific
+problems, but also promises to unleash novel inelastic X-ray scattering
+spectroscopies",1809.06288v2
+2019-07-11,Tuning skyrmion Hall effect via engineering of spin-orbit interaction,"We demonstrate that the Magnus force acting on magnetic skyrmions can be
+efficiently tuned via modulation of the spin-orbit interaction strength. We
+show that the skyrmion Hall effect, which is a direct consequence of the
+non-vanishing Magnus force on the magnetic structure can be suppressed in
+certain limits. Our calculations show that the emergent magnetic fields in the
+presence of spin-orbit coupling (SOC) renormalize the Lorentz force on
+itinerant electrons and thus influence the topological transport. In
+particular, we show that for a N\'eel-type skyrmion and Bloch-type
+antiskyrmion, the skyrmion Hall effect (SkHE) can vanish by tuning
+appropriately the strength of Rashba and Dresselhaus SOCs, respectively. Our
+results open up alternative directions to explore in a bid to overcome the
+parasitic and undesirable SkHE for spintronic applications.",1907.05196v1
+2019-09-13,Hidden spin-orbital order in the Kitaev hyperhoneycomb $β$-Li$_2$IrO$_3$,"We report the existence of a phase transition at high temperature in the 3D
+Kitaev candidate material, $\beta$-Li$_2$IrO$_3$. We show that the transition
+is bulk, intrinsic and orders a tiny magnetic moment with a spatially
+anisotropic saturation moment. We show that even though this transition is
+global, it does not freeze the local Ir moments, which order at much lower
+temperatures into an incommensurate state. Rather, the ordered moment has an
+orbital origin that is coupled to spin correlations, likely of a Kitaev origin.
+The separate ordering of spin-correlated orbital moments and of local Ir
+moments reveals a novel way in which magnetic frustration in Kitaev systems can
+lead to coexisting magnetic states.",1909.06355v1
+2017-09-26,Possibility to realize spin-orbit-induced correlated physics in iridium fluorides,"Recent theoretical predictions of ""unprecedented proximity"" of the electronic
+ground state of iridium fluorides to the SU(2) symmetric $j_{\mathrm{eff}}=1/2$
+limit, relevant for superconductivity in iridates, motivated us to investigate
+their crystal and electronic structure. To this aim, we performed
+high-resolution x-ray powder diffraction, Ir L$_3$-edge resonant inelastic
+x-ray scattering, and quantum chemical calculations on Rb$_2$[IrF$_6$] and
+other iridium fluorides. Our results are consistent with the Mott insulating
+scenario predicted by Birol and Haule [Phys. Rev. Lett. 114, 096403 (2015)],
+but we observe a sizable deviation of the $j_{\mathrm{eff}}=1/2$ state from the
+SU(2) symmetric limit. Interactions beyond the first coordination shell of
+iridium are negligible, hence the iridium fluorides do not show any magnetic
+ordering down to at least 20 K. A larger spin-orbit coupling in iridium
+fluorides compared to oxides is ascribed to a reduction of the degree of
+covalency, with consequences on the possibility to realize spin-orbit-induced
+strongly correlated physics in iridium fluorides.",1709.09027v1
+2018-07-03,General relativistic manifestations of orbital angular and intrinsic hyperbolic momentum in electromagnetic radiation,"General relativistic effects in the weak field approximation are calculated
+for electromagnetic Laguerre-Gaussian (LG) beams. The current work is an
+extension of previous work on the precession of a spinning neutral particle in
+the weak gravitational field of an optical vortex. In the current work, the
+metric perturbation is extended to all coordinate configurations and includes
+gravitational effects from circular polarization and intrinsic hyperbolic
+momentum. The final metric reveals frame-dragging effects due to intrinsic spin
+angular momentum (SAM), orbital angular momentum (OAM), and spin-orbit (SO)
+coupling. When investigating the acceleration of test particles in this metric,
+an unreported gravitational phenomenon was found. This effect is analogous to
+the motion of charged particles in the magnetic field produced by a current
+carrying wire. It was found that the gravitational influence of SAM and OAM
+affects test-rays traveling perpendicular to the intense beam and from this a
+gravitational Aharonov-Bohm analog is pursued.",1807.00933v1
+2018-07-09,Spin-orbit interaction in Pt or Bi2Te3 nanoparticle-decorated graphene realized by a nanoneedle method,"The introduction of spin-orbit interactions (SOIs) and the subsequent
+appearance of a two-dimensional (2D) topological phase are crucial for
+voltage-controlled and zero-emission energy spintronic devices. In contrast,
+graphene basically lacks SOIs due to the small mass of the carbon atom, and
+appropriate experimental reports for SOIs are rare. Here, we control
+small-amount (cover ratios < 8%) random decoration of heavy nanoparticles
+[platinum (Pt) or bismuth telluride (Bi2Te3)] onto mono-layer graphene by
+developing an original nanoneedle method. X-ray photoelectron spectra support
+low-damage and low-contamination decoration of the nanoparticles, suggesting
+the presence of Bi-C and Te-C coupling orbitals. In the samples, we find
+particle-density-dependent non-local resistance (RNL) peaks, which are
+attributed to the (inverse) spin Hall effect (SHE) arising from SOI with
+energies as large as about 30 meV. This is a larger value than in previous
+reports and supported by scanning tunneling spectroscopy. The present
+observation should lead to topological phases of graphene, which can be
+introduced by random decoration with controlled small amounts of heavy
+nanoparticles, and their applications.",1807.02984v1
+2019-11-25,Application of k . p method on band structure of GaAs obtained through joint density functional theory,"The structural and electronic properties of zinc-blende (ZB) GaAs were
+calculated within the framework of plane wave density-functional theory (DFT)
+code JDFTx by using Becke 86 in 2D and PBE exchange correlation functionals
+from libXC. The standard optimized norm-conserving Vanderbilt pseudopotentials
+were used to calculate optimized lattice constant, band gap and spin-orbit
+split-off parameter. The calculated values of optimized lattice constant and
+direct band gap are in satisfactory agreement with other published theoretical
+and experimental findings. By including spin-orbit (SO) coupling, conduction
+band and valence bands were studied under parabolicity to calculate effective
+masses. The calculated values of effective masses and spin-orbit split-off
+parameter are in satisfactory agreement with most recent findings. This work
+will be useful for more computational studies related to semiconductor
+spintronic devices.",1911.10724v1
+2019-12-05,Anomalous Transition Magnetic Moments in two-dimensional Dirac Materials,"We show that the magnetic response of atomically thin materials with Dirac
+spectrum and spin-orbit interactions can exhibit strong dependence on
+electron-electron interactions. While graphene itself has a very small
+spin-orbit coupling, various two-dimensional (2D) compounds ""beyond graphene""
+are good candidates to exhibit the strong interplay between spin-orbit and
+Coulomb interactions. Materials in this class include dichalcogenides (such as
+MoS$_2$ and WSe$_2$), silicene, germanene, as well as 2D topological insulators
+described by the Kane-Mele model. We present a unified theory for their
+in-plane magnetic field response leading to ""anomalous"", i.e. electron
+interaction dependent transition moments. Our predictions can be potentially
+used to construct unique magnetic probes with high sensitivity to electron
+correlations.",1912.02749v3
+2016-03-14,Crystalline spin-orbit interaction and the Zeeman splitting in Pb$_{1-x}$Sn$_x$Te,"The ratio of the Zeeman splitting to the cyclotron energy ($M=\Delta E_Z /
+\hbar \omega_c$), which characterizes the relative strength of the spin-orbit
+interaction in crystals, is examined for the narrow gap IV-VI semiconductors
+PbTe, SnTe, and their alloy Pb$_{1-x}$Sn$_x$Te on the basis of the multiband
+$k\cdot p$ theory. The inverse mass $\alpha$, the g-factor $g$, and $M$ are
+calculated numerically by employing the relativistic empirical tight-binding
+band calculation. On the other hand, a simple but exact formula of $M$ is
+obtained for the six-band model based on the group theoretical analysis. It is
+shown that $M<1$ for PbTe and $M>1$ for SnTe, which are interpreted in terms of
+the relevance of the interband couplings due to the crystalline spin-orbit
+interaction. It is clarified both analytically and numerically that $M=1$ just
+at the band inversion point, where the transition from trivial to nontrivial
+topological crystalline insulator occurs. By using this property, one can
+detect the transition point only with the bulk measurements. It is also
+proposed that $M$ is useful to evaluate quantitatively a degree of the Dirac
+electrons in solids.",1603.04138v1
+2018-10-25,First-principles calculation of spin-orbit torque in a Co/Pt bilayer,"The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is
+calculated using a first-principles non-equilibrium Green's function formalism
+with an explicit supercell averaging over Anderson disorder. In addition to the
+usual dampinglike and fieldlike terms, the odd torque contains a sizeable
+planar Hall-like term $(\mathbf{m\cdot
+E})\mathbf{m}\times(\mathbf{z}\times\mathbf{m})$ whose contribution to
+current-induced damping is consistent with experimental observations. The
+dampinglike and planar Hall-like torquances depend weakly on disorder strength,
+while the fieldlike torquance declines with increasing disorder. The torques
+that contribute to damping are almost entirely due to spin-orbit coupling on
+the Pt atoms, but the fieldlike torque does not require it.",1810.11003v2
+2020-06-03,Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction,"The interaction between superconductivity and ferromagnetism in thin film
+superconductor/ferromagnet heterostructures is usually reflected by a change in
+superconductivity of the S layer set by the magnetic state of the F layers.
+Here we report the converse effect: transformation of the magnetocrystalline
+anisotropy of a single Fe(001) layer, and thus its preferred magnetization
+orientation, driven by the superconductivity of an underlying V layer through a
+spin-orbit coupled MgO interface. We attribute this to an additional
+contribution to the free energy of the ferromagnet arising from the controlled
+generation of triplet Cooper pairs, which depends on the relative angle between
+the exchange field of the ferromagnet and the spin-orbit field. This is
+fundamentally different from the commonly observed magnetic domain modification
+by Meissner screening or domain wall-vortex interaction and offers the ability
+to fundamentally tune magnetic anisotropies using superconductivity - a key
+step in designing future cryogenic magnetic memories.",2006.02118v2
+2021-01-01,Stripping the planar Quantum Compass Model to its basics,"We introduce a novel mean-field theory (MFT) around the exactly soluble
+two-leg ladder limit for the planar quantum compass model (QCM). In contrast to
+usual MFT, our construction respects the stringent constraints imposed by
+emergent, lower (here $d=1$) dimensional symmetries of the QCM. Specializing
+our construction to the QCM on a periodic four-leg ladder, we find that a
+first-order transition separates two mutually dual Ising nematic phases, in
+good accord with state-of-the-art numerics for the planar QCM. One
+pseudo-spin-flip excitation in the ordered phase turns out to be two
+(Jordan-Wigner) fermion bound states, reminiscent of spin waves in spin-$1/2$
+Heisenberg chains. We discuss the novel implications of our work on (1) the
+emergence of coupled orbital and magnetic ordered and liquidlike disordered
+phases, and (2) a rare instance of orbital-spin separation in $d>1$, in the
+context of a Kugel-Khomskii view of multi-orbital Mott insulators.",2101.00268v2
+2021-08-30,Spin to orbital angular momentum transfer in nonlinear wave mixing,"We demonstrate the spin to orbital angular momentum transfer in the nonlinear
+mixing of structured light beams. A vector vortex is coupled to a circularly
+polarized Gaussian beam in noncollinear second harmonic generation under
+type-II phase match. The second harmonic beam inherits the Hermite-Gaussian
+components of the vector vortex, however, the relative phase between them is
+determined by the polarization state of the Gaussian beam. This effect creates
+an interesting crosstalk between spin and orbital degrees of freedom, allowing
+the angular momentum transfer between them. Our experimental results match the
+theoretical predictions for the nonlinear optical response.",2108.13190v1
+2022-06-09,Spin-orbit excitons and electronic configuration of the $5d^4$ insulator Sr$_3$Ir$_2$O$_7$F$_2$,"Here we report on the low-energy excitations within the paramagnetic
+spin-orbit insulator Sr$_3$Ir$_2$O$_7$F$_2$ studied via resonant inelastic
+X-ray scattering, \textit{ab initio} quantum chemical calculations, and
+model-Hamiltonian simulations. This material is a unique $d^{4}$ Ir$^{5+}$
+analog of Sr$_3$Ir$_2$O$_7$ that forms when F ions are intercalated within the
+SrO layers spacing the square lattice IrO$_{6}$ bilayers of Sr$_3$Ir$_2$O$_7$.
+Due to the large distortions about the Ir$^{5+}$ ions, our computations
+demonstrate that a large single-ion anisotropy yields an $S$=1 ($L{\approx}$1,
+$J{\approx}$0) ground state wave function. Weakly coupled, excitonic modes out
+of the $S_z$=0 ground state are observed and are well-described by a
+phenomenological spin-orbit exciton model previously developed for $3d$ and
+$4d$ transition metal ions. The implications of our results regarding the
+interpretation of previous studies of hole-doped iridates close to $d^{4}$
+fillings are discussed.",2206.04721v1
+2022-08-22,"Current-induced magnetization reversal in (Ga,Mn)(Bi,As) epitaxial layer with perpendicular magnetic anisotropy","Pulsed current-induced magnetization reversal is investigated in the layer of
+(Ga,Mn)(Bi,As) dilute ferromagnetic semiconductor (DFS) epitaxially grown under
+tensile misfit strain causing perpendicular magnetic anisotropy in the layer.
+The magnetization reversal, recorded through measurements of the anomalous Hall
+effect, appearing under assistance of a static magnetic field parallel to the
+current, is interpreted in terms of the spin-orbit torque mechanism. Our
+results demonstrate that an addition of a small fraction of heavy Bi atoms,
+substituting As atoms in the prototype DFS (Ga,Mn)As and increasing the
+strength of spin-orbit coupling in the DFS valence band, significantly enhances
+the efficiency of current-induced magnetization reversal thus reducing
+considerably the threshold current density necessary for the reversal. Our
+findings are of technological importance for applications to spin-orbit
+torque-driven nonvolatile memory and logic elements.",2208.10318v1
+2022-11-17,Vibronic order and emergent magnetism in cubic $d^1$ double perovskites,"The synergistic interplay of different interactions in materials leads to the
+emergence of novel quantum phenomena. Spin-orbit and vibronic couplings usually
+counteract each other, however, in cubic $d^1$ double perovskites they coexist
+and give rise to spin-orbit-lattice entanglement with unquenched dynamic
+Jahn-Teller effect on the metal sites. The correlation of these entangled
+states induced by intersite interactions was not assessed so far. Here, we
+investigate the joint cooperative effect of spin-orbit and vibronic
+interactions on the formation of the ordered phases in $d^1$ double
+perovskites. We found that the magnetic ordered states in these systems coexist
+with a dynamic vibronic order characterized by the ordering of vibronic
+quadrupole moments on sites. This treatment allows the rationalization of a
+number of unexplained features of experimentally investigated phases.",2211.09577v4
+2023-05-04,Quasilinear theory of Brillouin resonances in rotating magnetized plasmas,"Both spin and orbital angular momentum can be exchanged between a rotating
+wave and a rotating magnetized plasma. Through resonances the spin and orbital
+angular momentum of the wave can be coupled to both the cyclotron rotation and
+the drift rotation of the particles. It is however shown that the Landau and
+cyclotron resonance conditions which classically describe resonant
+energy-momentum exchange between waves and particles are no longer valid in a
+rotating magnetized plasma column. In this case a new resonance condition which
+involves a resonant matching between the wave frequency, the cyclotron
+frequency modified by inertial effects and the harmonics of the guiding center
+rotation is identified. A new quasilinear equation describing orbital and spin
+angular momentum exchanges through these new Brillouin resonances is then
+derived, and used to expose the wave driven radial current responsible for
+angular momentum absorption.",2305.02671v1
+2023-08-07,Strong coupling of lattice and orbital excitations in quantum magnet Ca$_{10}$Cr$_7$O$_{28}$: Anomalous temperature dependence of Raman phonons,"We report low-temperature Raman signatures of the Heisenberg quantum magnet
+Ca$_{10}$Cr$_7$O$_{28}$, showing clear anomalies in phonon mode frequencies and
+linewidths below $\sim$100 K. This crossover temperature lies in between the
+Jahn-Teller (JT) temperature scale ($>$ room temperature) and the temperature
+scale associated with the spin exchange interactions ($<$ 12 K). Our
+experimental observation is well captured by a novel secondary JT transition
+associated with a cooperative reorientation of the orbitals giving rise to
+anomalies in the temperature dependence of Raman frequencies and linewidths.
+Such orbital reorganisation, in turn, affects the spin-spin exchange
+interactions that decide the fate of the magnet at lower temperatures and hence
+provide important clues to understand the energetics of the possible lower
+temperature quantum paramagnetic phase.",2308.03237v1
+2023-10-11,Electronic States in Helical Materials: General Properties and Application to InSeI,"In this article, we systematically explore several key properties of
+electronic states in helical materials systems, including the inheritance of
+orbital angular momentum (OAM) from local atomic orbitals to the entire helical
+structure, the conservation of helical momentum, and the emergence of
+helical-induced spin-orbit coupling (hSOC). We then apply this comprehensive
+theoretical framework to elucidate the electronic structure of one-dimensional
+(1D) helical crystal InSeI. Our analysis reveals the influence of hSOC, evident
+in spin-mixing energy gaps within the electronic band structure, as calculated
+through density functional theory. Utilizing a combination of tight-binding
+modeling and first-principles calculations, we ascertain the spin-polarized
+electric response and the chiral-switchable second-order photocurrent response
+of InSeI, characterized as the Landauer-Buttiker ballistic transport and shift
+current response. The results highlight the potential of 1D InSeI for
+applications in spintronics and optoelectronics. The overarching theoretical
+framework established in this work will prove invaluable for the investigation
+of other helical electronic systems.",2310.07530v1
+2024-02-12,Spin orbit resonance cascade via core shell model. Application to Mercury and Ganymede,"We discuss a model describing the spin orbit resonance cascade. We assume
+that the primary has a two-layer (core-shell) structure: it is composed by a
+thin solid crust and an inner and heavier solid core that are interacting due
+to the presence of a fluid interface. We assume two sources of dissipation: a
+viscous one, depending on the relative angular velocity between core and crust
+and a tidal one, smaller than the first, due to the viscoelastic structure of
+the core. We show how these two sources of dissipation are needful for the
+capture in spin-orbit resonance. The crust and the core fall in resonance with
+different time scales if the viscous coupling between them is big enough.
+Finally, the tidal dissipation of the viscoelastic core, decreasing the
+eccentricity, brings the system out of the resonance in a third very long time
+scale. This mechanism of entry and exit from resonance ends in the $1:1$ stable
+state.",2402.07650v1
+1995-12-05,Phase Diagram for Charge Density Waves in a Magnetic Field,"The influence of an external magnetic field on a quasi one-dimensional system
+with a charge density wave (CDW) instability is treated within the random phase
+approximation which includes both CDW and spin density wave correlations. We
+show that the CDW is sensitive to both orbital and Pauli effects of the field.
+In the case of perfect nesting, the critical temperature decreases monotonously
+with the field, and the wave vector of the instability starts to shift above
+some critical value of magnetic field. Depending on the ratio between the spin
+and charge coupling constants and on the direction of the applied magnetic
+field, the wave vector shift is either parallel ($CDW_x$ order) or
+perpendicular ($CDW_y$ order) to the most conducting direction. The $CDW_x$
+order is a field dependent linear combination of the charge and spin density
+waves and is sensible only to the Pauli effect. The wave vector shift in
+$CDW_y$ depends on the interchain coupling, but the critical temperature does
+not. This order is affected by the confinement of the electronic orbits. By
+increasing the relative strength of the orbital effect with respect to the
+Pauli effect, one can destroy the $CDW_y$, establishing either a $CDW_x$, or a
+$CDW_0$ (corresponding to perfect nesting wave vector). We also show that by
+increasing the imperfect nesting parameter, one passes from the regime where
+the critical temperature decreases with the field to the regime where it is
+initially enhanced by the orbital effect and eventually suppressed by the Pauli
+effect. For a bad nesting, the quantized phases of the field-induced CDW
+appear.",9512033v1
+2002-09-26,Magnetization orientation dependence of the quasiparticle spectrum and hysteresis in ferromagnetic metal nanoparticles,"We use a microscopic Slater-Koster tight-binding model with short-range
+exchange and atomic spin-orbit interactions that realistically captures generic
+features of ferromagnetic metal nanoparticles to address the mesoscopic physics
+of magnetocrystalline anisotropy and hysteresis in nanoparticle quasiparticle
+excitation spectra. Our analysis is based on qualitative arguments supported by
+self-consistent Hartree-Fock calculations for nanoparticles containing up to
+260 atoms. Calculations of the total energy as a function of magnetization
+direction demonstrate that the magnetic anisotropy per atom fluctuates by
+several percents when the number of electrons in the particle changes by one,
+even for the largest particles we consider. Contributions of individual
+orbitals to the magnetic anisotropy are characterized by a broad distribution
+with a mean more than two orders of magnitude smaller than its variance and
+with no detectable correlations between anisotropy contribution and
+quasiparticle energy. We find that the discrete quasiparticle excitation
+spectrum of a nanoparticle displays a complex non-monotonic dependence on an
+external magnetic field, with abrupt jumps when the magnetization direction is
+reversed by the field, explaining recent spectroscopic studies of magnetic
+nanoparticles. Our results suggests the existence of a broad cross-over from a
+weak spin-orbit coupling to a strong spin-orbit coupling regime, occurring over
+the range from approximately 200- to 1000-atom nanoparticles.",0209608v2
+2007-10-15,Charge disproportionation and collinear magnetic order in the frustrated triangular antiferromagnet AgNiO2,"We report a high-resolution neutron diffraction study of the crystal and
+magnetic structure of the orbitally-degenerate frustrated metallic magnet
+AgNiO2. At high temperatures the structure is hexagonal with a single
+crystallographic Ni site, low-spin Ni3+ with spin-1/2 and two-fold orbital
+degeneracy, arranged in an antiferromagnetic triangular lattice with frustrated
+spin and orbital order. A structural transition occurs upon cooling below 365 K
+to a tripled hexagonal unit cell containing three crystallographically-distinct
+Ni sites with expanded and contracted NiO6 octahedra, naturally explained by
+spontaneous charge order on the Ni triangular layers. No Jahn-Teller
+distortions occur, suggesting that charge order occurs in order to lift the
+orbital degeneracy. Symmetry analysis of the inferred Ni charge order pattern
+and the observed oxygen displacement pattern suggests that the transition could
+be mediated by charge fluctuations at the Ni sites coupled to a soft oxygen
+optical phonon breathing mode. At low temperatures the electron-rich Ni
+sublattice (assigned to a valence close to Ni2+ with S = 1) orders magnetically
+into a collinear stripe structure of ferromagnetic rows ordered
+antiferromagnetically in the triangular planes. We discuss the stability of
+this uncommon spin order pattern in the context of an easy-axis triangular
+antiferromagnet with additional weak second neighbor interactions and
+interlayer couplings.",0710.2811v2
+2021-04-16,"Optical, dielectric, and magnetoelectric properties of ferroelectric and antiferroelectric lacunar spinels","Lacunar spinels with a chemical formula of $AM_4X_8$ form a populous family
+of narrow-gap semiconductors, which offer a fertile ground to explore
+correlation and quantum phenomena, including transition between Mott and
+spin-orbit insulator states, ferro/antiferroelectricity driven by cluster
+Jahn-Teller effect, and magnetoelectric response of magnetic skyrmions with
+polar dressing. The electronic and magnetic properties of lacunar spinels are
+determined to a large extent by their molecular-crystal-like structure. The
+interplay of electronic correlations with spin-orbit and vibronic couplings
+leads to a complex electronic structure already on the single-cluster level,
+which -- together with weaker inter-cluster interactions -- gives rise to a
+plethora of unconventional correlated states. This review primarily focuses on
+recent progresses in the field of optical, dielectric, and magnetoelectric
+properties on lacunar spinels. After introducing the main structural aspects,
+lattice dynamics and electronic structure of these compounds are discussed on
+the basis of optical spectroscopy measurements. Dielectric and polarization
+studies reveal the main characteristics of their low-temperature ferro- or
+antiferroelectric phases as well as orbital fluctuations in their
+high-temperature cubic state. Strong couplings between spin, lattice, and
+orbital degrees of freedom are manifested in singlet formation upon
+magnetostructural transitions, the emergence of various multiferroic phases,
+and exotic domain-wall functionalities.",2104.08019v1
+2017-11-10,Transverse acoustic phonon anomalies at intermediate wavevectors in MgV$_{2}$O$_{4}$,"Magnetic spinels (with chemical formula $AX_{2}$O$_{4}$, with $X$ a 3$d$
+transition metal ion) that also have an orbital degeneracy are Jahn-Teller
+active and hence possess a coupling between spin and lattice degrees of
+freedom. At high temperatures, MgV$_{2}$O$_{4}$ is a cubic spinel based on
+V$^{3+}$ ions with a spin $S$=1 and a triply degenerate orbital ground state. A
+structural transition occurs at T$_{OO}$=63 K to an orbitally ordered phase
+with a tetragonal unit cell followed by an antiferromagnetic transition of
+T$_{N}$=42 K on cooling. We apply neutron spectroscopy in single crystals of
+MgV$_{2}$O$_{4}$ to show an anomaly for intermediate wavevectors at T$_{OO}$
+associated with the acoustic phonon sensitive to the shear elastic modulus
+$\left(C_{11}-C_{12}\right)/2$. On warming, the shear mode softens for momentum
+transfers near close to half the Brillouin zone boundary, but recovers near the
+zone centre. High resolution spin-echo measurements further illustrate a
+temporal broadening with increased temperature over this intermediate range of
+wavevectors, indicative of a reduction in phonon lifetime. A subtle shift in
+phonon frequencies over the same range of momentum transfers is observed with
+magnetic fields. We discuss this acoustic anomaly in context of coupling to
+orbital and charge fluctuations.",1711.03791v1
+2021-07-14,Designing light-element materials with large effective spin-orbit coupling,"Spin-orbit coupling (SOC), the core of numerous condensed-matter phenomena
+such as nontrivial band gap, magnetocrystalline anisotropy, etc, is generally
+considered to be appreciable only in heavy elements, detrimental to the
+synthetization and application of functional materials. Therefore, amplifying
+the SOC effect in light elements is of great importance. Here, focusing on 3d
+and 4d systems, we demonstrate that the interplay between crystal symmetry and
+electron correlation can dramatically enhance the SOC effect in certain
+partially occupied orbital multiplets, through the self-consistently reinforced
+orbital polarization as a pivot. We then provide design principles and
+comprehensive databases, in which we list all the Wyckoff positions and site
+symmetries, in all two-dimensional (2D) and three-dimensional crystals that
+potentially have such enhanced SOC effect. As an important demonstration, we
+predict nine material candidates from our selected 2D material pool as
+high-temperature quantum anomalous Hall insulators with large nontrivial band
+gaps of hundreds of meV. Our work provides an efficient and straightforward way
+to predict promising SOC-active materials, releasing the burden of requiring
+heavy elements for next-generation spin-orbitronic materials and devices.",2107.06691v2
+2022-08-17,Role of spin-orbit coupling effects in rare-earth metallic tetra-borides : a first principle study,"We have investigated the electronic structure of rare-earth tetraborides,
+$\textrm{RB}_{4}$, using first-principle electronic structure methods (DFT)
+implemented in Quantum Espresso (QE). In this article we have studied
+heather-to neglected strong spin-orbit coupling (SOC) effects present in these
+systems on the electronic structure of these system in the non-magnetic ground
+state. The calculations were done under GGA and GGA+SO approximations using
+ultrasoft pseudopotentials and fully relativistic ultrasoft pseudopotentials
+(for SOC case). Perdew-Burke-Ernzerhof generalized gradient approximation
+(PBE-GGA) exchange-correlation functionals within the linearized plane-wave
+(LAPW) method as implemented in QE were used. The projected density of states
+consists of 3 distinct spectral peaks well below the Fermi energy and separated
+from the continuum density of states around the Fermi energy. The discrete
+peaks arises due to rare-earth $s$-orbital, rare-earth $p$ + B $p$ and B
+$p$-orbitals while the continuum arises due to hybridized B $p$, rare-earth $d$
+orbitals. Upon inclusion of SOC the peak arising due to rare-earth $p$-orbitals
+gets split into two peaks corresponding to $j=0.5$ and $j=1.5$ configurations.
+In case of $\textrm{LaB}_{4}$, in the presence of SOC, spin-split $4f$ orbitals
+contributes to density of states at the Fermi level while the density of states
+at the Fermi level largely remains unaffected for all other materials under
+consideration.",2208.08381v1
+2023-10-28,Varying magnetism in the lattice distorted Y2NiIrO6 and La2NiIrO6,"We investigate the electronic and magnetic properties of the newly
+synthesized double perovskites Y$_{2}$NiIrO$_{6}$ and La$_{2}$NiIrO$_{6}$,
+using density functional calculations, crystal field theory, superexchange
+pictures, and Monte Carlo simulations. We find that both systems are
+antiferromagnetic (AFM) Mott insulators, with the high-spin Ni$^{2+}$
+$t_{2g}$$^{6}e_{g}$$^{2}$ ($S=1$) and the low-spin Ir$^{4+}$ $t_{2g}$$^{5}$
+($S=1/2$) configurations. We address that their lattice distortion induces
+$t_{2g}$-$e_{g}$ orbital mixing and thus enables the normal Ni$^{+}$-Ir$^{5+}$
+charge excitation with the electron hopping from the Ir `$t_{2g}$' to Ni
+`$e_g$' orbitals, which promotes the AFM Ni$^{2+}$-Ir$^{4+}$ coupling.
+Therefore, the increasing $t_{2g}$-$e_{g}$ mixing accounts for the enhanced
+$T_{\rm N}$ from the less distorted La$_{2}$NiIrO$_{6}$ to the more distorted
+Y$_{2}$NiIrO$_{6}$. Moreover, our test calculations find that in the otherwise
+ideally cubic Y$_{2}$NiIrO$_{6}$, the Ni$^{+}$-Ir$^{5+}$ charge excitation is
+forbidden, and only the abnormal Ni$^{3+}$-Ir$^{3+}$ excitation gives a weakly
+ferromagnetic (FM) behavior. Furthermore, we find that owing to the crystal
+field splitting, Hund exchange, and broad band formation in the highly
+coordinated fcc sublattice, Ir$^{4+}$ ions are not in the $j_{\rm eff}=1/2$
+state but in the $S=1/2$ state carrying a finite orbital moment by spin-orbit
+coupling (SOC). This work clarifies the varying magnetism in Y$_{2}$NiIrO$_{6}$
+and La$_{2}$NiIrO$_{6}$ associated with the lattice distortions.",2310.18641v2
+2016-07-13,Dynamics of Stellar Spin Driven by Planets Undergoing Lidov-Kozai Migration: Paths to Spin-Orbit Misalignment,"Many exoplanetary systems containing hot Jupiters (HJs) exhibit significant
+misalignment between the spin axes of the host stars and the orbital angular
+momentum axes of the planets (""spin-orbit misalignment""). High-eccentricity
+migration involving Lidov-Kozai oscillations of the planet's orbit induced by a
+distant perturber is a possible channel for producing such misaligned HJ
+systems. Previous works have shown that the dynamical evolution of the stellar
+spin axis during the high-$e$ migration plays a dominant role in generating the
+observed spin-orbit misalignment. Numerical studies have also revealed various
+patterns of the evolution of the stellar spin axis leading to the final
+misalignment. Here we develop an analytic theory to elucidate the evolution of
+spin-orbit misalignment during the Lidov-Kozai migration of planets in stellar
+binaries. Secular spin-orbit resonances play a key role in the misalignment
+evolution. We include the effects of short-range forces and tidal dissipation,
+and categorize the different possible paths to spin-orbit misalignment as a
+function of various physical parameters (e.g. planet mass and stellar rotation
+period). We identify five distinct spin-orbit evolution paths and outcomes,
+only two of which are capable of producing retrograde orbits. We show that
+these paths to misalignment and the outcomes depend only on two dimensionless
+parameters, which compare the stellar spin precession frequency with the rate
+of change of the planet's orbital axis, and the Lidov-Kozai oscillation
+frequency. Our analysis reveals a number of novel phenomena for the stellar
+spin evolution, ranging from bifurcation, adiabatic advection, to fully chaotic
+evolution of spin-orbit angles.",1607.03937v1
+2000-10-04,Spin Injection from Ferromagnetic Metals into Gallium Nitride,"The injection of spin polarized electrons from ferromagnetic metals (Fe and
+Co) into gallium nitride (GaN) via scanning tunneling microscopy (STM) is
+demonstrated. Electrons from STM tips are injected into the semiconductor. Net
+circular polarization of the emitted light is observed, which changes sign on
+reversal of the magnetization of the tip. The polarization is found to be in
+qualitative agreement with that expected from considerations based on the
+splitting of the valence bands due to spin-orbit coupling and the crystal field
+splitting corresponding to the wurtzite structure, and the magnitude of the
+spin polarization from the ferromagnetic metal. We find a lower bound for the
+spin injection efficiency of 25%, corresponding to a net spin polarization in
+the semiconductor of 10%. This is the largest reported value for a room
+temperature measurement of spin injection into semiconductors in air.",0010058v1
+2002-04-18,Spin-current modulation and square-wave transmission through periodically stubbed electron waveguides,"Ballistic spin transport through waveguides, with symmetric or asymmetric
+double stubs attached to them periodically, is studied systematically in the
+presence of a weak spin-orbit coupling that makes the electrons precess. By an
+appropriate choice of the waveguide length and of the stub parameters injected
+spin-polarized electrons can be blocked completely and the transmission shows a
+periodic and nearly square-type behavior, with values 1 and 0, with wide gaps
+when only one mode is allowed to propagate in the waveguide. A similar behavior
+is possible for a certain range of the stub parameters even when two-modes can
+propagate in the waveguide and the conductance is doubled. Such a structure is
+a good candidate for establishing a realistic spin transistor. A further
+modulation of the spin current can be achieved by inserting defects in a
+finite-number stub superlattice. Finite-temperature effects on the spin
+conductance are also considered.",0204415v1
+2003-10-01,SU(2) Non-Abelian Holonomy and Dissipationless Spin Current in Semiconductors,"Following our previous work [S. Murakami, N. Nagaosa, S. C. Zhang, Science
+301, 1348 (2003)] on the dissipationless quantum spin current, we present an
+exact quantum mechanical calculation of this novel effect based on the linear
+response theory and the Kubo formula. We show that it is possibxle to define an
+exactly conserved spin current, even in the presence of the spin-orbit coupling
+in the Luttinger Hamiltonian of p-type semiconductors. The light- and the
+heavy-hole bands form two Kramers doublets, and an SU(2) non-abelian gauge
+field acts naturally on each of the doublets. This quantum holonomy gives rise
+to a monopole structure in momentum space, whose curvature tensor directly
+leads to the novel dissipationless spin Hall effect, i.e., a transverse spin
+current is generated by an electric field. The result obtained in the current
+work gives a quantum correction to the spin current obtained in the previous
+semiclassical approximation.",0310005v3
+2004-07-26,Control of Electron Spin Coherence Using Landau Level Quantization in a Two-Dimensional Electron Gas,"Time-resolved optical measurements of electron spin dynamics in modulation
+doped InGaAs quantum wells are used to explore electron spin coherence times
+and spin precession frequencies in a regime where an out of plane magnetic
+field quantizes the states of a two-dimensional electron gas into Landau
+levels. Oscillatory features in the transverse spin coherence time and
+effective g-factor as a function of applied magnetic field exhibit a
+correspondence with Shubnikov-de Haas oscillations, illustrating a coupling
+between spin and orbital eigenstates. We present a theoretical model in which
+inhomogeneous dephasing due to the population of different Landau levels limits
+the spin coherence time and captures the essential experimental results.",0407681v1
+2004-08-29,Precessionless spin transport wire confined in quasi-two-dimensional electron systems,"We demonstrate that in an inversion-asymmetric two-dimensional electron
+system 2DES with both Rashba and Dresselhaus spin-orbit couplings taken into
+account, certain transport directions on which no spin precession occurs can be
+found when the injected spin is properly polarized. By analyzing the
+expectation value of spin with respect to the injected electron state on each
+space point in the 2DES, we further show that the adjacent regions with
+technically reachable widths along these directions exhibit nearly conserved
+spin. Hence a possible application in semiconductor spintronics, namely,
+precessionless spin transport wire, is proposed.",0408638v2
+2004-10-27,Spin Hall Current Driven by Quantum Interferences in Mesoscopic Rashba Rings,"We propose an all-electrical nanoscopic structure where {\em pure} spin
+current is induced in the transverse voltage probes attached to {\em
+quantum-coherent} one-dimensional ring when conventional unpolarized charge
+current is injected through its longitudinal leads. Tuning of the Rashba
+spin-orbit coupling in semiconductor heterostructure hosting the ring generates
+quasi-periodic oscillations of the predicted spin Hall current due to {\em
+spin-sensitive quantum-interference effects} caused by the difference in
+Aharonov-Casher phase acquired by opposite spins states traveling clockwise and
+counterclockwise. Its amplitude is comparable to the mesoscopic spin Hall
+current predicted for finite-size two-dimensional electron gases, while it gets
+reduced in wide two-dimensional or disordered rings.",0410716v1
+2005-07-21,"Datta-Das transistor: Significance of channel direction, size-dependence of source contacts, and boundary effects","We analyze the spin expectation values for injected spin-polarized electrons
+(spin vectors) in a [001]-grown Rashba-Dresselhaus two-dimensional electron gas
+(2DEG). We generalize the calculation for point spin injection in semi-infinite
+2DEGs to finite-size spin injection in bounded 2DEGs. Using the obtained spin
+vector formula, significance of the channel direction for the Datta-Das
+transistor is illustrated. Numerical results indicate that the influence due to
+the finite-size injection is moderate, while the channel boundary reflection
+may bring unexpected changes. Both effects are concluded to decrease when the
+spin-orbit coupling strength is strong. Hence [110] is a robust channel
+direction and is therefore the best candidate for the design of the Datta-Das
+transistor.",0507495v2
+2006-08-25,Observation of electric current induced by optically injected spin current,"A normally incident light of linear polarization injects a pure spin current
+in a strip of 2-dimensional electron gas with spin-orbit coupling. We report
+observation of an electric current with a butterfly-like pattern induced by
+such a light shed on the vicinity of a crossbar shaped InGaAs/InAlAs quantum
+well. Its light polarization dependence is the same as that of the spin
+current. We attribute the observed electric current to be converted from the
+optically injected spin current caused by scatterings near the crossing. Our
+observation provides a realistic technique to detect spin currents, and opens a
+new route to study the spin-related science and engineering in semiconductors.",0608546v1
+2003-05-01,Spin effects and baryon resonance dynamics in phi-meson photoproduction at few GeV,"The diffractive $\phi$-meson photoproduction amplitude is dominated by the
+Pomeron exchange process and contains the terms that govern the spin-spin and
+spin-orbital interactions.
+  We show that these terms are responsible for the spin-flip transitions at
+forward photoproduction angles and appear in the angular distributions of
+$\phi\to K^+K^-$ -decay in reactions with unpolarized and polarized photon
+beams.
+  At large momentum transfers, the main contribution to the $\phi$-meson
+photoproduction is found to be due to the excitation of nucleon resonances.
+  Combined analysis of $\omega$ and $\phi$ photoproduction indicates strong
+OZI-rule violation in $\phi NN^*$ - couplings.
+  We also show that the spin observables are sensitive to the dynamics of
+$\phi$-meson photoproduction at large angles and could help distinguish
+different theoretical models of nucleon resonances.
+  Predictions for spin effects in $\phi$-meson photoproduction are presented
+for future experimental tests.",0305002v2
+2009-02-02,Gauge-Invariant Formulation of Spin-Current-Density Functional Theory,"Spin-currents and non-abelian gauge potentials in electronic systems can be
+treated by spin-current-density functional theory, whose main input is the
+exchange-correlation (xc) energy expressed as a functional of spin-currents.
+Constructing a functional of spin currents that is invariant under
+U(1)$\times$SU(2) transformations is a long-standing challenge. We solve the
+problem by expressing the energy as a functional of a new variable we call
+""invariant vorticity"". As an illustration we construct the xc energy functional
+for a two-dimensional electron gas with linear spin-orbit coupling and show
+that it is proportional to the fourth power of the spin current.",0902.0374v2
+2009-06-28,Topological winding properties of spin edge states in Kane-Mele graphene model,"We study the spin edge states in the quantum spin-Hall (QSH) effect on a
+single-atomic layer graphene ribbon system with both intrinsic and Rashba
+spin-orbit couplings. The Harper equation for solving the energies of the spin
+edge states is derived. The results show that in the QSH phase, there are
+always two pairs of gapless spin-filtered edge states in the bulk energy gap,
+corresponding to two pairs of zero points of the Bloch function on the
+complex-energy Riemann surface (RS). The topological aspect of the QSH phase
+can be distinguished by the difference of the winding numbers of the spin edge
+states with different polarized directions cross the holes of the RS, which is
+equivalent to the Z2 topological invariance proposed by Kane and Mele [Phys.
+Rev. Lett. 95, 146802 (2005)].",0906.5118v1
+2009-07-14,Upstanding Rashba spin in honeycomb lattices: Electrically reversible surface spin polarization,"The spin-split states subject to Rashba spin-orbit coupling in
+two-dimensional systems have long been accepted as pointing inplane and
+perpendicular to the corresponding wave vectors. This is in general true for
+free electron model, but exceptions do exist elsewhere. Within the
+tight-binding model, we unveil the unusual upstanding behavior of those Rashba
+spins around $\bar{K}$ and $\bar{K}^{\prime}$ points in honeycomb lattices. Our
+calculation (i) explains the recent experiment of the Tl/Si(111)-$(1\times1)$
+surface alloy [Phys. Rev. Lett. \textbf{102}, 096805 (2009)], where abrupt
+upstanding spin states near $\bar{K}$ are observed, and (ii) predicts an
+electrically reversible out-of-plane surface spin polarization.",0907.2411v3
+2009-08-03,Direct Measurement of Quantum Dot Spin Dynamics using Time-Resolved Resonance Fluorescence,"We temporally resolve the resonance fluorescence from an electron spin
+confined to a single self-assembled quantum dot to measure directly the spin's
+optical initialization and natural relaxation timescales. Our measurements
+demonstrate that spin initialization occurs on the order of microseconds in the
+Faraday configuration when a laser resonantly drives the quantum dot
+transition. We show that the mechanism mediating the optically induced
+spin-flip changes from electron-nuclei interaction to hole-mixing interaction
+at 0.6 Tesla external magnetic field. Spin relaxation measurements result in
+times on the order of milliseconds and suggest that a $B^{-5}$ magnetic field
+dependence, due to spin-orbit coupling, is sustained all the way down to 2.2
+Tesla.",0908.0292v1
+2009-09-28,Is there a dynamical cause of the spin-statistics connection?,"Extant proofs of the spin-statistics connection (SSC) are kinematical. C S
+Unnikrishnan has suggested that a dynamical interaction leading to the SSC
+would involve spin and perforce gravity, the only known universal force. For
+the scattering of two identical particles, he considers [arXiv: gr-qc/0406043]
+the interaction of their spins with the gravito-magnetic field generated by
+their scattering motion through cosmic matter-energy. There the direct and
+particles-exchanged scattering amplitudes accumulate different quantum phases
+which provide the relevant bosonic/fermionic sign between them without applying
+the ad hoc SSC rule. Here it is shown that the scattering probabilities given
+by the standard implementation of SSC in quantum mechanics are actually not
+obtained from the above interaction for most initial spin states of the
+scattering particles. Instead, an unrealized peculiar dynamical interaction is
+required. Further, a spin-gravito-magnetic interaction as above (with caveats)
+would result in a large unmeasured spin-orbit coupling type effect on atomic
+energy levels. A comparison with a typical rotation based proof is also
+provided.",0909.5159v1
+2009-11-07,Spin relaxation in multiple (110) quantum wells,"We consider theoretically the relaxation of electron spin component parallel
+to the growth direction in multiple (110) GaAs quantum wells. The sources of
+spin relaxation are the random Rashba spin-orbit coupling due to the electric
+field of donors and spin-flip collisions of electrons from different quantum
+wells. We show that the screening of the Coulomb forces at low temperatures
+leads to a very strong enhancement of the spin relaxation time. In a degenerate
+electron gas the Pauli blocking suppresses the electron-electron collisions,
+and the leading spin relaxation mechanism comes from the field of donors. If
+the electron gas is nondegenerate the electron-electron collisions and
+scattering by the ionized donors give similar contributions to the relaxation
+rate.",0911.1444v2
+2009-11-25,Semiclassical dynamics and transport of the Dirac spin,"A semiclassical theory of spin dynamics and transport is formulated using the
+Dirac electron model. This is done by constructing a wavepacket from the
+positive-energy electron band, and studying its structure and center of mass
+motion. The wavepacket has a minimal size equal to the Compton wavelength, and
+has self-rotation about the average spin angular momentum, which gives rise to
+the spin magnetic moment. Geometric gauge structure in the center of mass
+motion provides a natural explanation of the spin-orbit coupling and various
+Yafet terms. Applications of the spin-Hall and spin-Nernst effects are
+discussed.",0911.4760v1
+2010-02-17,Spin symmetry in Dirac negative energy spectrum in density-dependent relativistic Hartree-Fock theory,"The spin symmetry in the Dirac negative energy spectrum and its origin are
+investigated for the first time within the density-dependent relativistic
+Hartree-Fock (DDRHF) theory. Taking the nucleus $^{16}$O as an example, the
+spin symmetry in the negative energy spectrum is found to be a good
+approximation and the dominant components of the Dirac wave functions for the
+spin doublets are nearly identical. In comparison with the relativistic Hartree
+approximation where the origin of spin symmetry lies in the equality of the
+scalar and vector potentials, in DDRHF the cancellation between the Hartree and
+Fock terms is responsible for the better spin symmetry properties and
+determines the subtle spin-orbit splitting. These conclusions hold even in the
+case when significant deviations from the G-parity values of the
+meson-antinucleon couplings occur.",1002.3309v1
+2010-12-03,NMR and NQR study of the tetrahedral frustrated quantum spin system Cu2Te2O5Br2 in its paramagnetic phase,"The quantum antiferromagnet Cu2Te2O5Br2 was investigated by NMR and NQR. The
+125Te NMR investigation showed that there is a magnetic transition around 10.5K
+at 9T, in agreement with previous studies. From the divergence of the
+spin-lattice relaxation rate, we ruled out the possibility that the transition
+could be governed by a one-dimensional divergence of the spin-spin correlation
+function. The observed anisotropy of the 125Te shift was shown to be due to a
+spin polarization of the 5s2 ""E"" doublet of the [TeO3E] tetrahedra,
+highlighting the importance of tellurium in the exchange paths. In the
+paramagnetic state, Br NQR and NMR measurements led to the determination of the
+Br hyperfine coupling and the electric field gradient tensor, and to the the
+spin polarization of Br p orbitals. The results demonstrate the crucial role of
+bromine in the interaction paths between Cu spins.",1012.0611v1
+2011-02-22,Spin-Hall current and spin polarization in an electrically biased SNS Josephson junction,"Periodic in time spin-Hall current and spin polarization induced by a dc
+electric bias has been calculated in a superconductor-normal
+2DEG-superconductor (SNS) Josephson junction. We assumed that the band energies
+of electrons in the normal system are splitted due to Rashba spin-orbit
+coupling. The transport parameters have been calculated within the diffusion
+approximation and using perturbation expansion over a small SN contact
+transparency. We found out that in contrast to the stationary Josephson effect,
+the spin-Hall current does not turn to zero. Besides a direct proximity effect
+caused by Cooper pair's transition into a triplet state, the spin current and
+polarization are also driven by a periodic electric field associated with the
+charge imbalance.",1102.4446v2
+2011-07-20,"Theory of the ground state spin of the NV- center in diamond: I. Fine structure, hyperfine structure, and interactions with electric, magnetic and strain fields","The ground state spin of the negatively charged nitrogen-vacancy center in
+diamond has been the platform for the recent rapid expansion of new frontiers
+in quantum metrology and solid state quantum information processing. In ambient
+conditions, the spin has been demonstrated to be a high precision magnetic and
+electric field sensor as well as a solid state qubit capable of coupling with
+nearby nuclear and electronic spins. However, in spite of its many outstanding
+demonstrations, the theory of the spin has not yet been fully developed and
+there does not currently exist thorough explanations for many of its
+properties, such as the anisotropy of the electron g-factor and the existence
+of Stark effects and strain splittings. In this work, the theory of the ground
+state spin is fully developed for the first time using the molecular orbital
+theory of the center in order to provide detailed explanations for the spin's
+fine and hyperfine structures and its interactions with electric, magnetic and
+strain fields.",1107.3868v1
+2012-03-23,Spin dynamics in a strongly driven system: very slow Rabi oscillations,"We consider joint effects of tunneling and spin-orbit coupling on driven by
+electric field spin dynamics in a double quantum dot with a multi-level
+resonance scenario. We demonstrate that tunneling plays the crucial role in the
+formation of the Rabi-like spin-flip transitions. In contrast to the linear
+behavior for weak electric fields, the spin flip rate becomes much smaller than
+expected for the two-level model and shows oscillating dependence on the
+driving field amplitude in stronger fields. In addition, the full spin flip is
+very difficult to achieve in a multi-level resonant system. These two effects
+have a similarity with the Zeno effect of slowing down the dynamics of an
+observable by its measurement. As a result, spin manipulation by electric field
+becomes much less efficient than expected.",1203.5287v1
+2012-03-25,Spin polarization direction switch based on an asymmetrical quantum wire,"A scheme for a spin polarization direction switch is investigated by studying
+the spin-dependent electron transport of an asymmetrical quantum wire (QW) with
+Rashba spin-orbit coupling (SOC). It is found that the magnitude of the
+spin-polarized current in the backward biased case is equal to it in the
+forward biased case but their signs are contrary. This results indicate that
+the spin polarization direction can be switched by changing the direction of
+the external current. The physical mechanism of this device may arise from the
+symmetries in the longitudinal and transverse directions are broken but
+$C_2$-rotation and time-reversal symmetries are still reserved. Further studies
+show that the spin polarization is robust against disorder, displaying the
+feasibility of the proposed structure for a potential application.",1203.5472v1
+2012-06-12,Magnetic Moment Formation in Graphene Detected by Scattering of Pure Spin Currents,"Hydrogen adatoms are shown to generate magnetic moments inside single layer
+graphene. Spin transport measurements on graphene spin valves exhibit a dip in
+the non-local spin signal as a function of applied magnetic field, which is due
+to scattering (relaxation) of pure spin currents by exchange coupling to the
+magnetic moments. Furthermore, Hanle spin precession measurements indicate the
+presence of an exchange field generated by the magnetic moments. The entire
+experiment including spin transport is performed in an ultrahigh vacuum
+chamber, and the characteristic signatures of magnetic moment formation appear
+only after hydrogen adatoms are introduced. Lattice vacancies also demonstrate
+similar behavior indicating that the magnetic moment formation originates from
+pz-orbital defects.",1206.2628v3
+2012-06-23,Spin-Valley Optical Selection Rule and Strong Circular Dichroism in Silicene,"Silicene (a monolayer of silicon atoms) is a topological insulator, which
+undergoes a topological phase transition to a band insulator under an external
+electric field. The spin polarization is unique and opposite at the K and K'
+points due to the spin-orbit coupling. Accordingly, silicene exhibits a strong
+circular dichroism with respect to optical absorption, obeying a certain
+spin-valley selection rule. It is remarkable that this selection rule is
+drastically different between these two types of insulators owing to a band
+inversion taking place at the phase transition point. Hence we can tell
+experimentally whether silicene is in the topological or band insulator phase
+by circular dichroism. Furthermore the selection rule enables us to excite
+electrons with definite spin and valley indices by optical absorption.
+Photo-induced current is spin polarized, where the spin direction is different
+between the topological and band insulators. It is useful for future
+spintronics applications.",1206.5378v1
+2012-09-10,Intrinsic spin Hall effect in monolayers of group-VI dichalcogenides: A first-principles study,"Using first-principles calculations within density functional theory, we
+investigate the intrinsic spin Hall effect in monolayers of group-VI
+transition-metal dichalcogenides MX2 (M = Mo, W and X = S, Se). MX2 monolayers
+are direct band-gap semiconductors with two degenerate valleys located at the
+corners of the hexagonal Brillouin zone. Because of the inversion symmetry
+breaking and the strong spin-orbit coupling, charge carriers in opposite
+valleys carry opposite Berry curvature and spin moment, giving rise to both a
+valley- and a spin-Hall effect. The intrinsic spin Hall conductivity (ISHC) in
+p-doped samples is found to be much larger than the ISHC in n-doped samples due
+to the large spin-splitting at the valence band maximum. We also show that the
+ISHC in inversion-symmetric bulk dichalcogenides is an order of magnitude
+smaller compared to monolayers. Our result demonstrates monolayer
+dichalcogenides as an ideal platform for the integration of valleytronics and
+spintronics.",1209.1964v2
+2013-03-20,Anomalous D'yakonov-Perel' spin relaxation in semiconductor quantum wells under strong magnetic field in Voigt configuration,"We report an anomalous scaling of the D'yakonov-Perel' spin relaxation with
+the momentum relaxation in semiconductor quantum wells under a strong magnetic
+field in the Voigt configuration. We focus on the case that the external
+magnetic field is perpendicular to the spin-orbit-coupling--induced effective
+magnetic field and its magnitude is much larger than the later one. It is found
+that the longitudinal spin relaxation time is proportional to the momentum
+relaxation time even in the strong scattering limit, indicating that the
+D'yakonov-Perel' spin relaxation shows the Elliott-Yafet-like behaviour.
+Moreover, the transverse spin relaxation time is inversely proportional
+(proportional) to the momentum relaxation time in the weak (strong) scattering
+limit, both in the opposite trends against the well-established conventional
+D'yakonov-Perel' spin relaxation behaviours. We further demonstrate that all
+the above anomalous scaling relations come from the unique form of the
+effective inhomogeneous broadening.",1303.4944v3
+2013-03-24,Spin-Transfer Torques in Helimagnets,"We theoretically investigate current-induced magnetization dynamics in
+chiral-lattice helimagnets. Spin-orbit coupling in non-centrosymmetric crystals
+induces a reactive spin-transfer torque that has not been previously
+considered. We demonstrate how the torque is governed by the crystal symmetry
+and acts as an effective magnetic field along the current direction in cubic
+B20-type crystals. The effects of the new torque are computed for
+current-induced dynamics of spin-spirals and the Doppler shift of spin waves.
+In current-induced spin-spiral motion, the new torque tilts the spiral
+structure. The spin waves of the spiral structure are initially displaced by
+the new torque, while the dispersion relation is unaffected.",1303.5921v2
+2014-02-18,Hidden spin polarization in inversion-symmetric bulk crystals,"Spin-orbit coupling (SOC) can induce spin polarization in nonmagnetic 3D
+crystals when the inversion symmetry is broken, as manifested by the bulk
+Rashba (R-1) and Dresselhaus (D-1) effects. We determine that these spin
+polarization effects originate fundamentally from specific atomic site
+asymmetries, rather than from the generally accepted asymmetry of the crystal
+space-group. This understanding leads to the recognition that a previously
+overlooked hidden form of spin polarization should exist in centrosymmetric
+materials. Although all energy bands must be doubly degenerate in
+centrosymmetric materials, we find that the two components of such doubly
+degenerate bands could have opposite polarizations each spatially localized on
+one of the two separate sectors forming the inversion partners. We demonstrate
+such hidden spin polarizations in centrosymmetric crystals (denoted as R-2 and
+D-2) by first-principles calculations. This new understanding could
+considerably broaden the range of currently useful spintronic materials and
+enable control of spin polarization via operations on atomic scale.",1402.4446v1
+2014-04-28,Spin Texture and Mirror Chern number in Hg-Based Chalcogenides,"The unique feature of surface states in topological insulators is the
+so-called ""spin-momentum locking"", which means that electron spin is oriented
+along a fixed direction for a given momentum and forms a texture in the
+momentum space. In this work, we study spin textures of two typical topological
+insulators in Hg-Based Chalcogenides, namely HgTe and HgS, based on both the
+first principles calculation and the eight band Kane model. We find opposite
+helicities of spin textures between these two materials, originating from the
+opposite signs of spin-orbit couplings. Furthermore, we reveal that different
+mirror Chern numbers between HgTe and HgS characterize different topological
+natures of the systems with opposite spin textures and guarantee the existence
+of gapless interface states.",1404.7091v3
+2014-08-07,Relation Between the Spin Hall Conductivity and the Spin Chern Number for Dirac-like Systems,"A semiclassical formulation of the spin Hall effect for physical systems
+satisfying Dirac-like equation is introduced. We demonstrated that the main
+contribution to the spin Hall conductivity is given by the spin Chern number
+whether the spin is conserved or not at the quantum level. We illustrated the
+formulation within the Kane-Mele model of graphene in the absence and in the
+presence of the Rashba spin-orbit coupling term.",1408.1596v3
+2014-10-15,Realizing unconventional quantum magnetism with symmetric top molecules,"We demonstrate that ultracold symmetric top molecules loaded into an optical
+lattice can realize highly tunable and unconventional models of quantum
+magnetism, such as an XYZ Heisenberg spin model. We show that anisotropic
+dipole-dipole interactions between molecules can lead to effective spin-spin
+interactions which exchange spin and orbital angular momentum. This exchange
+produces effective spin models which do not conserve magnetization and feature
+tunable degrees of spatial and spin-coupling anisotropy. In addition to
+deriving pure spin models when molecules are pinned in a deep optical lattice,
+we show that models of itinerant magnetism are possible when molecules can
+tunnel through the lattice. Additionally, we demonstrate rich tunability of the
+effective models' parameters using only a single microwave frequency, in
+contrast to proposals with $^1\Sigma$ diatomic molecules, which often require
+many microwave frequencies. Our results are germane not only for experiments
+with polyatomic symmetric top molecules, such as methyl fluoride (CH$_3$F), but
+also diatomic molecules with an effective symmetric top structure, such as the
+hydroxyl radical OH.",1410.4226v1
+2014-11-21,Multiple Quantum Phases in Graphene with Enhanced Spin-Orbit Coupling: From the Quantum Spin Hall Regime to the Spin Hall Effect and a Robust Metallic State,"We report an intriguing transition from the quantum spin Hall phase to the
+spin Hall effect upon segregation of thallium adatoms adsorbed onto a graphene
+surface. Landauer-B\""uttiker and Kubo-Greenwood simulations are used to access
+both edge and bulk transport physics in disordered thallium-functionalized
+graphene systems of realistic sizes. Our findings not only quantify the
+detrimental effects of adatom clustering in the formation of the topological
+state, but also provide evidence for the emergence of spin accumulation at
+opposite sample edges driven by spin-dependent scattering induced by thallium
+islands, which eventually results in a minimum bulk conductivity $\sim
+4e^{2}/h$, insensitive to localization effects.",1411.5837v2
+2014-12-12,Photon-assisted electronic and spin transport in a junction containing precessing molecular spin,"We study the ac charge and -spin transport through an orbital of a magnetic
+molecule with spin precessing in a constant magnetic field. We assume that the
+source and drain contacts have time-dependent chemical potentials. We employ
+the Keldysh nonequilibrium Green's functions method to calculate the spin and
+charge currents to linear order in the time-dependent potentials. The molecular
+and electronic spins are coupled via exchange interaction. The time-dependent
+molecular spin drives inelastic transitions between the molecular quasienergy
+levels, resulting in a rich structure in the transport characteristics. The
+time-dependent voltages allow us to reveal the internal precession time scale
+(the Larmor frequency) by a dc conductance measurement if the ac frequency
+matches the Larmor frequency. In the low-ac-frequency limit the junction
+resembles a classical electric circuit. Furthermore, we show that the setup can
+be used to generate dc-spin currents, which are controlled by the molecular
+magnetization direction and the relative phases between the Larmor precession
+and the ac voltage.",1412.3994v2
+2015-01-06,Berry-phase effects and electronic dynamics in noncollinear antiferromagnetic texture,"Antiferromagnets (AFMs), in contrast to ferromagnets, show a nontrivial
+magnetic structure with zero net magnetization. However, they share a number of
+spintronic effects with ferromagnets, including spin-pumping and spin transfer
+torques. Both phenomena stem from the coupled dynamics of free carriers and
+localized magnetic moments. In the present paper I study the adiabatic dynamics
+of a spin-polarized electrons in a metallic AFM exhibiting a noncollinear
+120$^\circ$ magnetic structure. I show that the slowly varying AFM spin texture
+produces a non-Abelian gauge potential related to the time/space gradients of
+the N\'{e}el vectors. Corresponding emergent electric and magnetic fields
+induce rotation of spin and influence the orbital dynamics of free electrons. I
+discuss both the possibility of a topological spin Hall effect in the vicinity
+of topological AFM solitons with nonzero curvature and rotation of the electron
+spin traveling through the AFM domain wall.",1501.01189v2
+2014-08-26,Post-Newtonian dynamics basing on Mathisson-Papapetrou equations with Corinaldesi-Papapetrou condition in Kerr spacetime,"We derive the post-Newtonian dynamics for a spinning body with
+Corinaldesi-Papapetrou spin supplementary condition in Kerr spacetime. Both the
+equations of motion for the center-of-mass of body and the spin evolution are
+obtained. For the non-relativistic case, our calculations show that the
+magnitude of spin measured in the rest frame of the body's center-of-mass does
+not change with time, though the center-of-mass does not move along the
+geodesic. Moreover, we find that the effects of the spin-orbit and spin-spin
+couplings will be suppressed by the Lorentz factor when the body has a
+relativistic velocity.",1504.02049v3
+2015-05-20,Effect of Transverse Magnetic Field on Dynamics of Current Driven Domain Wall Motion in the Presence of Spin-Hall Effect,"Theoretically, we study the dynamics of a current induced domain wall in the
+bi-layer structure consists of a ferromagnetic layer and a non-magnetic metal
+layer with strong spin-orbit coupling in the presence of spin-Hall effect. The
+analytical expressions for the velocity and width of the domain wall interms of
+excitation angle are obtained by solving the Landau-Lifshitz-Gilbert equation
+with adiabatic, nonadiabatic and spin Hall effect-spin transfer torques using
+Schryers and Walker's method. Numerical results show that the occurance of
+polarity switching in the domain wall is observed only above the threshold
+current density. The presence of transverse magnetic field along with spin Hall
+effect-spin transfer torque enchances the value of the threshold current
+density, and the corresponding saturated velocity at the threshold current
+density is also increased.",1505.05249v1
+2015-09-25,Geometrical spin manipulation in Dirac flakes,"We investigate numerically the spin properties of electrons in flakes made of
+materials described by the Dirac equation, at the presence of intrinsic
+spin-orbit-coupling(SOC). We show that electrons flowing along the borders of
+flakes via edge states, become helically spin-polarized for strong SOC, for
+materials with and without a gap at the Fermi energy, corresponding to the
+massive and massless Dirac equation respectively. The helically spin-polarized
+electrons cause geometrical spin splitting on opposite sides of the flakes,
+leading to spin-resolved transport controlled by the flake's geometry in a
+multi-terminal device setup. A simple analytical model containing the basic
+ingredients of the problem is introduced to get an insight of the helical
+mechanism, along with our numerical results which are based on an effective
+tight-binding model.",1509.07654v1
+2016-01-27,Observation of magnon-mediated current drag in Pt/yttrium iron garnet/Pt(Ta) trilayers,"Pure spin current, a flow of spin angular momentum without flow of any
+companying net charge, is generated in two common ways. One makes use of the
+spin Hall effect in normal metals (NM) with strong spin-orbit coupling, such as
+Pt or Ta. The other utilizes the collective motion of magnetic moments or spin
+waves with the quasi-particle excitations called magnons. A popular material
+for the latter is yttrium iron garnet, a magnetic insulator (MI). Here we
+demonstrate in NM/MI/NM trilayers that these two types of spin currents are
+interconvertible across the interfaces, predicated as the magnon-mediated
+current drag phenomenon. The transmitted signal scales linearly with the
+driving current without a threshold and follows the power-law with n ranging
+from 1.5 to 2.5. Our results indicate that the NM/MI/NM trilayer structure can
+serve as a scalable pure spin current valve device which is an essential
+ingredient in spintronics.",1601.07429v1
+2016-02-09,Transporting a single-spin qubit through a double quantum dot,"Coherent spatial transport or shuttling of a single electron spin through
+semiconductor nanostructures is an important ingredient in many spintronic and
+quantum computing applications. In this work we analyze the possible errors in
+solid-state quantum computation due to leakage in transporting a single-spin
+qubit through a semiconductor double quantum dot. In particular, we consider
+three possible sources of leakage errors associated with such transport: finite
+ramping times, spin-dependent tunneling rates between quantum dots induced by
+finite spin-orbit couplings, and the presence of multiple valley states. In
+each case we present quantitative estimates of the leakage errors, and discuss
+how they can be minimized. Moreover, we show that in order to minimize leakage
+errors induced by spin-dependent tunnelings, it is necessary to apply pulses to
+perform certain carefully designed spin rotations. We further develop a
+formalism that allows one to systematically derive constraints on the pulse
+shapes and present a few examples to highlight the advantage of such an
+approach.",1602.03179v1
+2016-04-11,All-Optical Study of Tunable Ultrafast Spin Dynamics in [Co/Pd]-NiFe Systems: The Role of Spin-Twist Structure on Gilbert Damping,"We investigate optically induced ultrafast magnetization dynamics in [Co(0.5
+nm)/Pd(1 nm)]x5/NiFe(t) exchange-spring samples with tilted perpendicular
+magnetic anisotropy using a time-resolved magneto-optical Kerr effect
+magnetometer. The competition between the out-of-plane anisotropy of the hard
+layer, the in-plane anisotropy of the soft layer and the applied bias field
+reorganizes the spins in the soft layer, which are modified further with the
+variation in t. The spin-wave spectrum, the ultrafast demagnetization time, and
+the extracted damping coefficient all depend on the spin distribution in the
+soft layer, while the latter two also depend on the spin-orbit coupling between
+the Co and Pd layers. The spin-wave spectra change from multimode to
+single-mode as t increases. At the maximum field reached in this study, H=2.5
+kOe, the damping shows a nonmonotonic dependence on t with a minimum at t=7.5
+nm. For t<7.5 nm, intrinsic effects dominate, whereas for t>7.5 nm, extrinsic
+effects govern the damping mechanisms.",1604.02998v1
+2017-08-06,Asymmetric Andreev resonant state with a magnetic exchange field in spin-triplet superconducting monolayer $MoS_2$,"Featuring spin-valley degree of freedom by a magnetic exchange
+field-induction to gain transport of charge carriers through a junction based
+on superconducting subgap tunneling can provide a new scenario for future
+electronics. Transmission of low-energy Dirac-like electron (hole)
+quasiparticles through a ferromagnet/superconductor (F/S) interface can be of
+noticeable importance due to strong spin-orbit coupling in the valence band of
+monolayer $MoS_2$ (ML-MDS). The magnetic exchange field (MEF) of a
+ferromagnetic section on top of ML-MDS may affect the electron (hole)
+excitations for spin-up and spin-down electrons, differently. Tuning the MEF
+enables one to control either electrical properties (such as band gap, SOC and
+etc.) or spin-polarized transport. We study the influence of MEF on the
+chirality of Andreev resonant state (ARS) appearing at the relating F/S
+interface, in which the induced pairing order parameter is chiral $p$-wave
+symmetry. The resulting normal conductance is found to be more sensitive to the
+magnitude of MEF and doping regime of F region. Unconventional spin-triplet
+$p$-wave symmetry features the zero-bias conductance, which strongly depends on
+$p$-doping level of F region in the relating NFS junction.",1708.01863v1
+2020-07-03,Quantification of interfacial spin-charge conversion in metal/insulator hybrid structures by generalized boundary conditions,"We present and verify experimentally a universal theoretical framework for
+the description of spin-charge interconversion in non-magnetic metal/insulator
+structures with interfacial spin-orbit coupling (ISOC). Our formulation is
+based on drift-diffusion equations supplemented with generalized boundary
+conditions. The latter encode the effects of ISOC and relate the electronic
+transport in such systems to spin loss and spin-charge interconversion at the
+interface, which are parameterized, respectively, by $G_{\parallel/\perp}$ and
+$\sigma_{\rm{sc/cs}}$. We demonstrate that the conversion efficiency depends
+solely on these interfacial parameters. We apply our formalism to two typical
+spintronic devices that exploit ISOC: a lateral spin valve and a multilayer
+Hall bar, for which we calculate the non-local resistance and the spin Hall
+magnetoresistance, respectively. Finally, we perform measurements on these two
+devices with a BiO$_x$/Cu interface and verify that transport properties
+related to the ISOC are quantified by the same set of interfacial parameters.",2007.01596v1
+2010-05-07,Controlling the spin orientation of photoexcited electrons by symmetry breaking,"We study reflection of optically spin-oriented hot electrons as a means to
+probe the semiconductor crystal symmetry and its intimate relation with the
+spin-orbit coupling. The symmetry breaking by reflection manifests itself by
+tipping the net-spin vector of the photoexcited electrons out of the light
+propagation direction. The tipping angle and the pointing direction of the
+net-spin vector are set by the crystal-induced spin precession, momentum
+alignment and spin-momentum correlation of the initial photoexcited electron
+population. We examine non-magnetic semiconductor heterostructures and
+semiconductor/ferromagnet systems and show the unique signatures of these
+effects.",1005.1280v3
+2013-08-15,Spin-Wave Propagation in the Presence of Interfacial Dzyaloshinskii-Moriya Interaction,"In ferromagnetic thin films, broken inversion symmetry and spin-orbit
+coupling give rise to interfacial Dzyaloshinskii-Moriya interactions. Analytic
+expressions for spin-wave properties show that the interfacial
+Dzyaloshinskii-Moriya interaction leads to non-reciprocal spin-wave
+propagation, i.e. different properties for spin waves propagating in opposite
+directions. In favorable situations, it can increase the spin-wave attenuation
+length. Comparing measured spin wave properties in ferromagnet$|$normal metal
+bilayers and other artificial layered structures with these calculations can
+provide a useful characterization of the interfacial Dzyaloshinskii-Moriya
+interactions.",1308.3341v1
+2013-08-15,Detection of the microwave spin pumping using the inverse spin Hall effect,"We report electrical detection of the dynamical part of the spin pumping
+current emitted during ferromagnetic resonance (FMR) using the inverse Spin
+Hall Effect (ISHE). The experiment is performed on a YIG$|$Pt bilayer. The
+choice of YIG, a magnetic insulator, ensures that no charge current flows
+between the two layers and only pure spin current produced by the magnetization
+dynamics are transferred into the adjacent strong spin-orbit Pt layer via spin
+pumping. To avoid measuring the parasitic eddy currents induced at the
+frequency of the microwave source, a resonance at half the frequency is induced
+using parametric excitation in the parallel geometry. Triggering this nonlinear
+effect allows to directly detect on a spectrum analyzer the microwave component
+of the ISHE voltage. Signals as large as 30 $\mu$V are measured for precession
+angles of a couple of degrees. This direct detection provides a novel efficient
+means to study magnetization dynamics on a very wide frequency range with great
+sensitivity.",1308.3433v2
+2016-10-31,Signature of Hanle Precession in Trilayer MoS2: Theory and Experiment,"Valley-spin coupling in transition-metal dichalcogenides (TMDs) can result in
+unusual spin transport behaviors under an external magnetic field. Nonlocal
+resistance measured from 2D materials such as TMDs via electrical Hanle
+experiments are predicted to exhibit nontrivial features, compared with results
+from conventional materials due to the presence of intervalley scattering as
+well as a strong internal spin-orbit field. Here, for the first time, we report
+the all-electrical injection and non-local detection of spin polarized carriers
+in trilayer MoS_2 films. We calculate the Hanle curves theoretically when the
+separation between spin injector and detector is much larger than spin
+diffusion length, \lamda_s. The experimentally observed curve matches the
+theoretically-predicted Hanle shape under the regime of slow intervalley
+scattering. The estimated spin life-time was found to be around 110 ps at 30 K.",1611.00059v1
+2017-01-18,Conversion of electronic to magnonic spin current at heavy-metal magnetic-insulator interface,"Electronic spin current is convertible to magnonic spin current via the
+creation or annihilation of thermal magnons at the interface of a magnetic
+insulator and a metal with a strong spin-orbital coupling. So far this
+phenomenon was evidenced in the linear regime. Based on analytical and
+fulledged numerical results for the non-linear regime we demonstrate that the
+generated thermal magnons or magnonic spin current in the insulator is
+asymmetric with respect to the charge current direction in the metal and
+exhibits a nonlinear dependence on the charge current density, which is
+explained by the tuning effect of the spin Hall torque and the magnetization
+damping. The results are also discussed in light of and are in line with recent
+experiments pointing to a new way of non-linear manipulation of spin with
+electrical means.",1701.05148v1
+2018-05-21,Spin Response and Collective Modes in Simple Metal Dichalcogenides,"Transition metal dichalcogenide (TMD) monolayers are interesting materials in
+part because of their strong spin-orbit coupling. This leads to intrinsic
+spin-splitting of opposite signs in opposite valleys, so the valleys are
+intrinsically spin-polarized when hole-doped. We study spin response in a
+simple model of these materials, with an eye to identifying sharp collective
+modes (i.e, spin-waves) that are more commonly characteristic of ferromagnets.
+We demonstrate that such modes exist for arbitrarily weak repulsive
+interactions, even when they are too weak to induce spontaneous ferromagnetism.
+The behavior of the spin response is explored for a range of hole dopings and
+interaction strengths.",1805.08223v2
+2008-07-24,Nonlinear electron and spin transport in semiconductor superlattices,"Nonlinear charge transport in strongly coupled semiconductor superlattices is
+described by Wigner-Poisson kinetic equations involving one or two minibands.
+Electron-electron collisions are treated within the Hartree approximation
+whereas other inelastic collisions are described by a modified BGK
+(Bhatnaghar-Gross-Krook) model. The hyperbolic limit is such that the collision
+frequencies are of the same order as the Bloch frequencies due to the electric
+field and the corresponding terms in the kinetic equation are dominant. In this
+limit, spatially nonlocal drift-diffusion balance equations for the miniband
+populations and the electric field are derived by means of the Chapman-Enskog
+perturbation technique. For a lateral superlattice with spin-orbit interaction,
+electrons with spin up or down have different energies and their corresponding
+drift-diffusion equations can be used to calculate spin-polarized currents and
+electron spin polarization. Numerical solutions show stable self-sustained
+oscillations of the current and the spin polarization through a voltage biased
+lateral superlattice thereby providing an example of superlattice spin
+oscillator.",0807.3900v1
+2012-04-22,Spin Hall effect versus Rashba torque: a Diffusive Approach,"Current-driven magnetization dynamics of single ferromagnets in heavy
+metal/ferromagnet bilayers has been recently realized. In this work, spin
+torque induced by so-called Rashba spin-orbit coupling and spin Hall effect are
+considered within a diffusive model. The dependence of the resulting torque as
+a function of the thicknesses of the ferromagnet and heavy metal is analyzed.
+We show that (i) both torques are on the form ${\bf T}=T_{||}{\bf m}\times{\bf
+y}+T_\bot{\bf m}\times({\bf y}\times{\bf m})$, (ii) the ratio $T_{||}/T_\bot$
+strongly depends on the thickness of the layers and (iii) the thickness
+dependence of the spin torque provides an indication of the origin of the
+(Rashba- or spin Hall effect-induced) spin torque .",1204.4869v1
+2015-12-17,Graphene-based spin switch device via modulated Rashba field and strain,"We investigate the spin-resolved transport in a two-terminal zigzag graphene
+nanoribbon device with two independent gate induced Rashba spin-orbit coupling
+regions and in the presence of strain. By employing a recursive Green's
+function technique to the tight-binding model for the graphene nanoribbon, we
+calculate the spin-resolved conductance of the system. We show that by
+switching the sign of one of the gates it is possible to select which spin
+component will be transmitted. Moreover, our results show that an uniaxial
+strain applied to the nanoribbon plays a significant role in the transport,
+providing and additional manner to control the spin-polarized conductance. This
+makes the present system a potential candidate for future implementations of
+spin-based mechanical strain sensors.",1512.05436v2
+2017-06-12,Quantum spin liquid in the semiclassical regime,"Quantum spin liquids have been at the forefront of correlated electron
+research ever since their original proposal in 1973, and the realization that
+they belong to the broader class of intrinsic topological orders, along with
+the fractional quantum Hall states. According to received wisdom, quantum spin
+liquids can arise in frustrated magnets with low spin $S$, where strong quantum
+fluctuations act to destabilize conventional, magnetically ordered states. Here
+we present a magnet that has a $Z_2$ quantum spin liquid ground state already
+in the semiclassical, large-$S$ limit. The state has both topological and
+symmetry related ground state degeneracy, and two types of gaps, a `magnetic
+flux' gap that scales linearly with $S$ and an `electric charge' gap that drops
+exponentially in $S$. The magnet is described by the spin-$S$ version of the
+spin-1/2 Kitaev honeycomb model, which has been the subject of intense studies
+in correlated electron systems with strong spin-orbit coupling, and in optical
+lattice realizations with ultracold atoms. The results apply to both integer
+and half-integer spins.",1706.03756v2
+2017-06-22,The perfect spin injection in silicene FS/NS junction,"We theoretically investigate the spin injection from a ferromagnetic silicene
+to a normal silicene (FS/NS), where the magnetization in the FS is assumed from
+the magnetic proximity effect. Based on a silicene lattice model, we
+demonstrated that the pure spin injection could be obtained by tuning the Fermi
+energy of two spin species, where one is in the spin orbit coupling gap and the
+other one is outside the gap. Moreover, the valley polarity of the spin species
+can be controlled by a perpendicular electric field in the FS region. Our
+findings may shed light on making silicene-based spin and valley devices in the
+spintronics and valleytronics field.",1706.07278v1
+2017-10-26,Itinerant spin fluctuations in iron-based superconductors,"Multiband systems, which possess a wide parameter space, allow to explore a
+variety of competing ground states. Bright examples are the Fe-based pnictides
+and chalcogenides, which demonstrate metallic, superconducting, and various
+magnetic phases. Here I discuss only one of the many interesting topics,
+namely, spin fluctuations in metallic multiband systems. I show how to
+calculate the effect of itinerant spin excitations on the electronic properties
+and formulate a theory of spin fluctuation-induced superconductivity. The
+superconducting state is unconventional and thus the system demonstrates
+unusual spin response with the spin resonance feature. I discuss its origin,
+consequences, and relation to experimental observations. Role of the spin-orbit
+coupling is specifically emphasized.",1710.09888v1
+2019-07-13,Ab initio modelling of spin relaxation lengths in disordered graphene nanoribbons†,"The spin-dependent transport properties of armchair graphene nanoribbons in
+the presence of extrinsic spin-orbit coupling induced by a random distribution
+of Nickel adatoms is studied. By combining a recursive Green's function
+formalism with density functional theory, we explore the influence of ribbon
+length and metal adatom concentration on the conductance. At a given length, we
+observed a significant enhancement of the spin-flip channel around resonances
+and at energies right above the Fermi level. We also estimate the
+spin-relaxation length, finding values on the order of tens of micrometers at
+low Ni adatom concentrations. This study is conducted at singular ribbon
+lengths entirely from fully ab-initio methods, providing indirectly evidence
+that the Dyakonov-Perel spin relaxation mechanism might be the dominant at low
+concentrations as well as the observation of oscillations in the
+spin-polarization.",1907.05979v1
+2020-12-08,Pure spin current injection of single-layer monochalcogenides,"We compute the spectrum of pure spin current injection in ferroelectric
+single-layer SnS, SnSe, GeS, and GeSe. The formalism takes into account the
+coherent spin dynamics of optically excited conduction states split in energy
+by spin orbit coupling. The velocity of spins is calculated as a function of
+incoming photon energy and angle of linearly polarized light within a full
+electronic band structure scheme using density functional theory. We find peak
+speeds of 250, 210, 180 and 154 Km/s for SnS, SnSe, GeS and GeSe, respectively
+which are an order of magnitude larger than those found in bulk semiconductors,
+e.g., CdSe and GaAs. Interestingly, the spin velocity is independent of the
+direction of polarization of light in a range of photon energies. Our results
+demonstrate that single-layer SnS, SnSe, GeS and GeSe are candidates to produce
+on demand spin-velocity injection for spintronics applications.",2012.04604v1
+2017-05-10,Interplay of valley polarization and dynamic nuclear polarization in 2D transition metal dichalcogenides,"The interplay of Ising spin-orbit coupling and non-trivial band topology in
+transition metal dichalcogenides (TMDs) produces anomalous transport and
+optical properties that are very different from a regular 2D electron gas. The
+spin-momentum locking of optically excited carriers near a valley point can
+give rise to an anomalous spin-valley Hall current under the application of an
+in-plane electric field. TMDs also exhibit strong electron-nuclear hyperfine
+interactions, but their effect on spin-valley-locked currents remains unknown.
+Here, we show that hyperfine interactions can create a feedback mechanism in
+which spin-valley currents generate significant dynamical nuclear polarization
+which in turn Zeeman shifts excitonic transitions out of resonance with an
+optical driving field, saturating the production of spin-valley polarization.
+We propose an experimental signature of dynamic nuclear polarization which can
+be detected via measurements of the anomalous Hall current. Our results help to
+elucidate the interplay of valley polarization and nuclear spin dynamics in
+TMDs.",1705.03909v2
+2017-05-24,Covariant conservation laws and the spin Hall effect in Dirac-Rashba systems,"We present a theoretical analysis of two-dimensional Dirac-Rashba systems in
+the presence of disorder and external perturbations. We unveil a set of exact
+symmetry relations (Ward identities) that impose strong constraints on the spin
+dynamics of Dirac fermions subject to proximity-induced interactions. This
+allows us to demonstrate that an arbitrary dilute concentration of scalar
+impurities results in the total suppression of nonequilibrium spin Hall
+currents when only Rashba spin-orbit coupling is present. Remarkably, a finite
+spin Hall conductivity is restored when the minimal Dirac-Rashba model is
+supplemented with a spin-valley interaction. The Ward identities provide a
+systematic way to predict the emergence of the spin Hall effect in a wider
+class of Dirac-Rashba systems of experimental relevance and represent an
+important benchmark for testing the validity of numerical methodologies.",1705.08898v2
+2017-09-22,Multiple odd-frequency superconducting states in buckled quantum spin Hall insulators with time-reversal symmetry,"We consider a buckled quantum spin Hall insulator (QSHI), such as silicene,
+proximity-coupled to a conventional spin-singlet, s-wave superconductor. Even
+limiting the discussion to the disorder-robust s-wave pairing symmetry, we find
+both odd-frequency ($\omega$), spin-singlet and spin-triplet pair amplitudes
+and where both preserve time-reversal symmetry. Our results show that there are
+two unrelated mechanisms generating these different odd-$\omega$ pair
+amplitudes. The spin-singlet state is due to the strong inter-orbital processes
+present in the QSHI. It is exists generically at the edges of the QSHI, but
+also in the bulk in heavily doped regime if an electric field is applied. The
+spin-triplet state requires a finite gradient in the proximity-induced
+superconducting order along the edge, which we find is automatically generated
+at the atomic scale for armchair edges but not at zigzag edges. In combination
+these results make superconducting QSHIs a very exciting venue for
+investigating not only the existence of odd-$\omega$ superconductivity, but
+also the interplay between different odd-$\omega$ states.",1709.07835v2
+2018-03-08,Competing spin transfer and dissipation at Co/Cu(001) interfaces on femtosecond timescales,"By combining interface-sensitive non-linear magneto-optical experiments with
+femtosecond time resolution and ab-initio time-dependent density functional
+theory, we show that optically excited spin dynamics at Co/Cu(001) interfaces
+proceeds via spin-dependent charge transfer and backtransfer between Co and Cu.
+This ultrafast spin transfer competes with dissipation of spin angular momentum
+mediated by spin-orbit coupling already on sub 100 fs timescales. We thereby
+identify the fundamental microscopic processes during laser-induced spin
+transfer at a model interface for technologically relevant ferromagnetic
+heterostructures.",1803.03090v3
+2018-03-27,Magneto-Electric Effect in a Spin-State Transition System,"Magnetic, dielectric, and magnetoelectric properties in a spin-state
+transition system are examined, motivated by the recent discovery of a
+multiferroic behavior in a cobalt oxide. We construct an effective model
+Hamiltonian based on the two-orbital Hubbard model, in which the spin-state
+degrees of freedom in magnetic ions couple with ferroelectric-type lattice
+distortions. A phase transition occurs from the high-temperature low-spin phase
+to the low-temperature high-spin ferroelectric phase with accompanying an
+increase of the spin entropy. The calculated results are consistent with the
+experimental pressure-temperature phase diagram. We predict the magnetic-field
+induced electric polarization in the low-spin paraelectric phase near the
+ferroelectric phase boundary.",1803.09881v1
+2018-08-28,Theory of charge-spin conversion at oxide interfaces: The inverse spin-galvanic effect,"We evaluate the non-equilibrium spin polarization induced by an applied
+electric field for a tight-binding model of electron states at oxides
+interfaces in LAO/STO heterostructures. By a combination of analytic and
+numerical approaches we investigate how the spin texture of the electron
+eigenstates due to the interplay of spin-orbit coupling and inversion asymmetry
+determines the sign of the induced spin polarization as a function of the
+chemical potential or band filling, both in the absence and presence of local
+disorder. With the latter, we find that the induced spin polarization evolves
+from a non monotonous behavior at zero temperature to a monotonous one at
+higher temperature. Our results may provide a sound framework for the
+interpretation of recent experiments.",1808.09157v1
+2018-12-11,Semiclassical conservation of spin and large transverse spin current in Dirac systems,"In Dirac materials, the low energy excitations obey the relativistic Dirac
+equation. This dependence implies that the electrons are exposed to strong
+spin-orbit coupling. Hence, real spin conservation is believed to be violated
+in Dirac materials. We show that this point of view needs to be refined in the
+semiclassical picture which applies to the case of doped Dirac materials (away
+from the nodal point in the spectrum). We derive a novel type of Boltzmann
+equation for these systems if they are brought slightly out-of-equilibrium.
+Remarkably, spin-momentum locking is softened and a generalized spin
+conservation law can be formulated. The most striking observable consequence of
+our theory is a large transverse spin current in a nearly ballistic transport
+regime.",1812.04493v2
+2019-03-03,Theory for spin torque in Weyl semimetal with magnetic texture,"The spin-transfer torque is a fundamental physical quantity to operate the
+spintronics devices such as racetrack memory. We theoretically study the
+spin-transfer torque and analyze the dynamics of the magnetic domain walls in
+magnetic Weyl semimetals. Owing to the strong spin-orbit coupling in Weyl
+semimetals, the spin-transfer torque can be significantly enhanced, because of
+which they can provide a more efficient means of controlling magnetic textures.
+We derive the analytical expression of the spin-transfer torque and find that
+the velocity of the domain wall is one order of magnitude greater than that of
+conventional ferromagnetic metals. Furthermore, due to the suppression of
+longitudinal conductivity in the thin domain-wall configuration, the
+dissipation due to Joule heating for the spin-transfer torque becomes much
+smaller than that in bulk metallic ferromagnets. Consequently, the fast-control
+of the domain wall can be achieved with smaller dissipation from Joule heating
+in the Weyl semimetals as required for application to low-energy-consumption
+spintronics devices.",1903.00849v1
+2019-03-04,Weak localization in boron nitride encapsulated bilayer MoS$_2$,"We present measurements of weak localization on hexagonal boron nitride
+encapsulated bilayer MoS$_2$. From the analysis we obtain information regarding
+the phase-coherence and the spin diffusion of the electrons. We find that the
+encapsulation with boron nitride provides higher mobilities in the samples, and
+the phase-coherence shows improvement, while the spin relaxation does not
+exhibit any significant enhancement compared to non-encapsulated MoS$_2$. The
+spin relaxation time is in the order of a few picoseconds, indicating a fast
+intravalley spin-flip rate. Lastly, the spin-flip rate is found to be
+independent from electron density in the current range, which can be explained
+through counteracting spin-flip scattering processes based on electron-electron
+Coulomb scattering and extrinsic Bychkov-Rashba spin-orbit coupling.",1903.01536v1
+2019-04-16,Spontaneous generation of spin current from the vacuum by strong electric fields,"We discuss spontaneous spin current generation from the vacuum by strong
+electric fields as a result of interplay between the Schwinger mechanism and a
+spin-orbit coupling. By considering a homogeneous slow strong electric field
+superimposed by a fast weak transverse electric field, we explicitly evaluate
+the vacuum expectation value of a spin current (the Bargmann-Wigner spin
+current) by numerically solving the Dirac equation. We show that a
+non-vanishing spin current polarized in the direction perpendicular to the
+electric fields flows mostly in the longitudinal direction. We also find that a
+relativistic effect due to the helicity conservation affects
+direction/polarization of spin current.",1904.07593v2
+2020-08-20,Anisotropic ultrafast spin/valley dynamics in WTe2 films,"WTe2 Weyl semimetal hosts the natural broken inversion symmetry and strong
+spin orbit coupling, making it promising for exotic spin/valley dynamics within
+a picosecond timescale. Here, we unveil an anisotropic ultrafast spin/valley
+dynamics in centimeter-scale, single-crystalline Td-WTe2 films using a
+femtosecond pump-probe technique at room temperature. We observe a transient
+(~0.8 ps) intra-valley transition and a subsequent polarization duration (~5
+ps) during the whole spin/valley relaxation process. Furthermore, the
+relaxation exhibits the remarkable anisotropy of approximately six-fold and
+two-fold symmetries due to the intrinsic anisotropy along the crystalline
+orientation and the extrinsic matrix element effect, respectively. Our results
+offer a prospect for the ultrafast manipulation of spin/valleytronics in
+topological quantum materials for dissipationless high-speed spin/valleytronic
+devices.",2008.08785v2
+2020-10-22,Spin-polarized tunable photocurrents,"Harnessing the unique features of topological materials for the development
+of a new generation of topological based devices is a challenge of paramount
+importance. Using Floquet scattering theory combined with atomistic models we
+study the interplay between laser illumination, spin and topology in a
+two-dimensional material with spin-orbit coupling. Starting from a topological
+phase, we show how laser illumination can selectively disrupt the topological
+edge states depending on their spin. This is manifested by the generation of
+pure spin currents and spin-polarized charge photocurrents under linearly and
+circularly polarized laser-illumination, respectively. Our results open a path
+for the generation and control of spin-polarized photocurrents.",2010.11883v2
+2020-11-13,Interface enhanced helicity dependent photocurrent in metal/semimetal bilayers,"One of the hallmarks of light-spin interaction in solids is the appearance of
+photocurrent that depends on the light helicity. Recent studies have shown that
+helicity dependent photocurrent (HDP) emerges due to light induced spin current
+and the inverse spin Hall effect of semimetal thin films. We have studied HDP
+in metal/semimetal bilayers. Compared to Bi single layer films, we find the HDP
+is enhanced in metal/Bi bilayers. For the bilayers, the sign of HDP under back
+illumination reverses from that of front illumination. The back illumination
+photocurrent is the largest for Ag/Bi bilayers among the bilayers studied.
+Using a diffusive spin transport model, we show that the HDP sign reversal
+under back illumination is caused by spin absorption and spin to charge
+conversion at the interface. Such interfacial effects contribute to the HDP
+enhancement under front illumination for the bilayers when the Bi layer
+thickness is small. These results show that the HDP can be used to assess
+interface states with strong spin orbit coupling.",2011.06786v1
+2021-04-09,Strong anomalous proximity effect from spin-singlet superconductors,"The proximity effect from a spin-triplet $p_x$-wave superconductor to a dirty
+normal-metal has been shown to result in various unusual electromagnetic
+properties, reflecting a cooperative relation between topologically protected
+zero-energy quasiparticles and odd-frequency Cooper pairs. However, because of
+a lack of candidate materials for spin-triplet $p_x$-wave superconductors,
+observing this effect has been difficult. In this paper, we demonstrate that
+the anomalous proximity effect, which is essentially equivalent to that of a
+spin-triplet $p_x$-wave superconductor, can occur in a semiconductor/high-$T_c$
+cuprate superconductor hybrid device in which two potentials coexist: a
+spin-singlet $d$-wave pair potential and a spin--orbit coupling potential
+sustaining the persistent spin-helix state. As a result, we propose an
+alternative and promising route to observe the anomalous proximity effect
+related to the profound nature of topologically protected quasiparticles and
+odd-frequency Cooper pairs.",2104.04246v2
+2016-03-15,A Realization of the Haldane-Kane-Mele Model in a System of Localized Spins,"We theoretically study a spin Hamiltonian for spin-orbit-coupled ferromagnets
+on the honeycomb lattice. We find that the effective Hamiltonian for magnons, a
+quanta of spin-wave excitations from ordered states, is equivalent to the
+Haldane model for electrons in the honeycomb lattice, which indicates the
+nontrivial topology of the magnon bands and the existence of the associated
+edge state. We also take the Schwinger boson (or bosonic spinon)
+representations of spins that are applicable both to ordered and disordered
+phases. We show that the spinon bands within the mean-field treatment are
+topologically nontrivial, which causes a spin Nernst effect, by adopting the
+properties of the Kane-Mele model. A feasible experimental realization of the
+spin Hamiltonian is proposed.",1603.04827v2
+2016-10-02,Spin galvanic effect at the conducting SrTiO3 surfaces,"The (001) surface of SrTiO3 were transformed from insulating to conducting
+after Ar+ irradiation, producing a quasi two-dimensional electron gas (2DEG).
+This conducting surface layer can introduce Rashba spin orbital coupling due to
+the broken inversion symmetry normal to the plane. The spin splitting of such a
+surface has recently been demonstrated by magneto-resistance and angular
+resolved photoemission spectra measurements. Here we present experiments
+evidencing a large spin-charge conversion at the surface. We use spin pumping
+to inject a spin current from NiFe film into the surface, and measure the
+resulting charge current. The results indicate that the Rashba effect at the
+surface can be used for efficient charge-spin conversion, and the large
+efficiency is due to the multi-d-orbitals and surface corrugation. It holds
+great promise in oxide spintronics.",1610.00249v1
+2017-11-02,Single Magnetic Impurity in Tilted Dirac Surface States,"We utilize variational method to investigate the Kondo screening of a
+spin-1/2 magnetic impurity in tilted Dirac surface states with the Dirac cone
+tilted along the $k_y$-axis. We mainly study about the effect of the tilting
+term on the binding energy and the spin-spin correlation between magnetic
+impurity and conduction electrons, and compare the results with the
+counterparts in a two dimensional helical metal. The binding energy has a
+critical value while the Dirac cone is slightly tilted. However, as the tilting
+term increases, the density of states around the Fermi surface becomes
+significant, such that the impurity and the host material always favor a bound
+state. The diagonal and the off-diagonal terms of the spin-spin correlation
+between the magnetic impurity and conduction electrons are also studied. Due to
+the spin-orbit coupling and the tilting of the spectra, various components of
+spin-spin correlation show very strong anisotropy in coordinate space, and are
+of power-law decay with respect to the spatial displacements.",1711.00634v2
+2017-11-04,Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2,"We use neutron polarization analysis to study spin excitation anisotropy in
+the optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 (Tc = 30 K).
+Different from optimally hole and electron-doped BaFe2As2, where there is a
+clear spin excitation anisotropy in the paramagnetic tetragonal state well
+above Tc, we find no spin excitation anisotropy for energies above 2 meV in the
+normal state of BaFe2(As0.7P0.3)2. Upon entering the superconducting state,
+significant spin excitation anisotropy develops at the antiferromagnetic (AF)
+zone center QAF = (1, 0, L = odd), while magnetic spectrum is isotropy at the
+zone boundary Q = (1, 0, L = even). By comparing temperature, wave vector, and
+polarization dependence of the spin excitation anisotropy in BaFe2(As0.7P0.3)2
+and hole-doped Ba0.67K0.33Fe2As2 (Tc = 38 K), we conclude that such anisotropy
+arises from spin-orbit coupling and is associated with the nearby AF order and
+superconductivity.",1711.01497v1
+2018-10-01,Giant Intrinsic Spin Hall Effect in W$_3$Ta and other A15 Superconductors,"The spin Hall effect (SHE) is the conversion of charge current to spin
+current, and non-magnetic metals with large SHEs are extremely sought after for
+spintronic applications, but their rarity has stifled widespread use. Here we
+predict and explain the large intrinsic SHE in $\beta$-W and the A15 family of
+superconductors: W$_3$Ta, Ta$_3$Sb, and Cr$_3$Ir having spin hall
+conductivities (SHC) of -2250, -1400, and 1210 $\frac{\hbar}{e}(\Omega
+cm)^{-1}$, respectively. Combining concepts from topological physics with the
+dependence of the SHE on the spin Berry curvature (SBC) of the electronic
+bands, we propose a simple strategy to rapidly search for materials with large
+intrinsic SHEs based on the following ideas: high symmetry combined with heavy
+atoms gives rise to multiple Dirac-like crossings in the electronic structure,
+without sufficient symmetry protection these crossings gap due to spin orbit
+coupling (SOC), and gapped Dirac crossings create large spin Berry curvature.",1810.00858v1
+2019-05-29,Highly conductive and complete spin filtering of nickel atomic contacts in a nitrogen atmosphere,"Generating efficient and highly spin-polarized currents through nanoscale
+junctions is essential in the field of nanoelectronics and spintronics. In this
+paper, using $ab$ $initio$ electron transport calculations, we predict highly
+conductive and perfect spin filtering of nickel atomic contacts in a nitrogen
+environment, where a single N$_2$ molecule sits in parallel (energetically most
+favorable) between two nickel electrodes. Such a particular performance is due
+to the wave function orthogonality between majority spin $s$-like states of
+ferromagnetic electrodes and the lowest unoccupied molecular orbital of the
+N$_2$ molecule, and thus, majority spin electrons are completely blocked at the
+interface. For the minority spin, on the contrary, two almost saturated
+conducting channels were formed due to the effective coupling between
+$d_{zx,zy}$ of the Ni atom and $p_{x,y}$ of the N atom, resulting in large
+conductance of about 1$G_0$ ($=2e^2/h$). As a consequence, a single N$_2$
+molecule acts as a highly conductive and half-metallic conductor. On the other
+hand, the CO and NO incorporated molecular junctions exhibit rather low
+conductance with a partially spin-polarized current.",1905.12606v1
+2020-06-17,Sustainable spin current in the time-dependent Rashba system,"The generation of spin current and spin polarization in 2DEG Rashba system is
+considered, in which the spin-orbital coupling (SOC) is modulated by an ac gate
+voltage. By using non-Abelian gauge field method, we show the presence of an
+additional electric field. This field induces a spin current generated even in
+the presence of impurity scattering and is related to the time-modulation of
+the Rashba SOC strength. In addition, the spin precession can be controlled by
+modulating the modulation frequency of the Rashba SOC strength. It is shown
+that at high modulation frequency, the precessional motion is suppressed so
+that the electron spin polarization can be sustained in the 2DEG",2006.09644v1
+2021-03-16,All-electrical Magnon Transport Experiments in Magnetically Ordered Insulators,"Angular momentum transport is one of the cornerstones of spintronics. Spin
+angular momentum is not only transported by mobile charge carriers, but also by
+the quantized excitations of the magnetic lattice in magnetically ordered
+systems. In this regard, magnetically ordered insulators provide a platform for
+magnon spin transport experiments without additional contributions from spin
+currents carried by mobile electrons. In combination with charge-to-spin
+current conversion processes in conductors with finite spin-orbit coupling it
+is possible to realize all-electrical magnon transport schemes in thin film
+heterostructures. This review provides an insight into such experiments and
+recent breakthroughs achieved. Special attention is given to charge current
+based manipulation via an adjacent normal metal of magnon transport in
+magnetically ordered insulators in terms of spin-transfer torque. Moreover, the
+influence of two magnon modes with opposite spin in antiferromagnetic
+insulators on all-electrical magnon transport experiments is discussed.",2103.08996v2
+2021-05-15,Neutron--proton spin--spin correlations in the ground states of N=Z nuclei,"We present expressions for the matrix elements of the spin--spin operator
+$\vec S_{\rm n}\cdot\vec S_{\rm p}$ in a variety of coupling schemes. These
+results are then applied to calculate the expectation value $\langle\vec S_{\rm
+n}\cdot\vec S_{\rm p}\rangle$ in eigenstates of a schematic Hamiltonian
+describing neutrons and protons interacting in a single-$l$ shell through a
+Surface Delta Interaction. The model allows us to trace $\langle\vec S_{\rm
+n}\cdot\vec S_{\rm p}\rangle$ as a function of the competition between the
+isovector and isoscalar interaction strengths and the spin--orbit splitting of
+the $j=l\pm \frac{1}{2}$ shells. We find negative $\langle\vec S_{\rm
+n}\cdot\vec S_{\rm p}\rangle$ values in the ground state of all even--even
+$N=Z$ nuclei, contrary to what has been observed in hadronic inelastic
+scattering at medium energies. We discuss the possible origin of this
+discrepancy and indicate directions for future theoretical and experimental
+studies related to neutron--proton spin--spin correlations.",2105.07267v1
+2021-07-06,Direct X-ray detection of the spin Hall effect in CuBi,"The spin Hall effect and its inverse are important spin-charge conversion
+mechanisms. The direct spin Hall effect induces a surface spin accumulation
+from a transverse charge current due to spin orbit coupling even in
+non-magnetic conductors. However, most detection schemes involve additional
+interfaces, leading to large scattering in reported data. Here we perform
+interface free x-ray spectroscopy measurements at the Cu L_{3,2} absorption
+edges of highly Bi-doped Cu (Cu_{95}Bi_{5}). The detected X-ray magnetic
+circular dichroism (XMCD) signal corresponds to an induced magnetic moment of
+(2.7 +/- 0.5) x 10-12 {\mu}_{B} A^{-1} cm^{2} per Cu atom averaged over the
+probing depth, which is of the same order as for Pt measured by magneto-optics.
+The results highlight the importance of interface free measurements to assess
+material parameters and the potential of CuBi for spin-charge conversion
+applications.",2107.02620v1
+2021-12-29,Topological spin texture of chiral edge states in photonic two-dimensional quantum walks,"Topological insulators host topology-linked boundary states, whose spin and
+charge degrees of freedom could be exploited to design topological devices with
+enhanced functionality. We experimentally observe that dissipationless chiral
+edge states in a spin-orbit coupled anomalous Floquet topological phase exhibit
+topological spin texture on boundaries, realized via a two-dimensional quantum
+walk. Our experiment shows that, for a walker traveling around a closed loop
+along the boundary in real space, its spin evolves and winds through a great
+circle on the Bloch sphere, which implies that edge-spin texture has nontrivial
+winding. This winding is linked to the bulk Dirac Hamiltonian around the
+energy-gap opening point. Our experiment confirms that two-dimensional
+anomalous Floquet topological systems exhibit topological spin texture on the
+boundary, which could inspire novel topology-based spintronic phenomena and
+devices.",2112.14563v2
+2022-06-19,Charge-to-spin conversion in twisted graphene/WSe$_2$ heterostructures,"We investigate the twist angle dependence of spin-orbit coupling (SOC)
+proximity effects and charge-to-spin conversion (CSC) in graphene/WSe$_2$
+heterostructures from first principles. The CSC is shown to strongly depend on
+the twist angle, with both the spin Hall and standard Rashba-Edelstein
+efficiencies optimized at or near 30{\deg} twisting. Symmetry breaking due to
+twisting also gives rise to an unconventional Rashba-Edelstein effect, with
+electrically generated non-equilibrium spin densities possessing spins
+collinear to the applied electric field. We further discuss how the carrier
+doping concentration and band broadening control the crossover between the
+Fermi-sea and -surface spin response, which reconciles the seemingly disparate
+experimental observations of different CSC phenomena.",2206.09478v1
+2022-07-19,"Magnetic interactions in AB-stacked kagome lattices: magnetic structure, symmetry, and duality","We present the results of an extensive study of the phase diagram and spin
+wave excitations for a general spin model on a hexagonal AB-stacked kagome
+system. The boundaries of the magnetic phases are determined via a combination
+of numerical (Monte Carlo) and analytical (Luttinger-Tisza) methods. We also
+determine the phase coexistence regions by considering the instabilities in the
+spin wave spectra. Depending on the strength of the spin-orbit coupling (SOC),
+some spin and lattice rotations become decoupled, leading to considerably
+larger symmetry groups than typical magnetic groups. Thus, we provide a
+detailed symmetry description of the magnetic Hamiltonian with negligible,
+weak, and intermediate strength of SOC. The spin symmetry in these three cases
+has a strong effect on the splittings observed in the spin excitation spectra.
+We further identify a number of self-duality transformations that map the
+Hamiltonian onto itself. These transformations describe the symmetry of the
+parameter space and provide an exact mapping between the properties of
+different magnetic orders and lead to accidental degeneracies. Finally, we
+discuss the physical relevance of our findings in the context of
+$\mathrm{Mn}_3X$ compounds.",2207.09297v1
+2022-08-10,Efficient spin-to-charge interconversion in Weyl semimetal TaP at room temperature,"In this paper we present spin-to-charge current conversion properties in the
+Weyl semimetal TaP by means of the inverse Rashba-Edelstein effect (IREE) with
+the integration of this quantum material with the ferromagnetic metal Permalloy
+$(Py=Ni_{81}Fe_{19})$. The spin currents are generated in the Py layer by the
+spin pumping effect (SPE) from microwave-driven ferromagnetic resonance and are
+detected by a dc voltage along the TaP crystal, at room temperature. We observe
+a field-symmetric voltage signal without the contamination of asymmetrical
+lines due to spin rectification effects observed in studies using metallic
+ferromagnets. The observed voltage is attributed to spin-to-charge current
+conversion based on the IREE, made possible by the spin-orbit coupling induced
+intrinsically by the bulk band structure of Weyl semimetals. The measured IREE
+coefficient ${\lambda}_{IREE}=(0.30 \pm{0.01})$ nm is two orders of magnitude
+larger than in graphene and is comparable to or larger than the values reported
+for some metallic interfaces and for several topological insulators.",2208.05151v1
+2022-08-19,Spectroscopy of spin-split Andreev levels in a quantum dot with superconducting leads,"We use a hybrid superconductor-semiconductor transmon device to perform
+spectroscopy of a quantum dot Josephson junction tuned to be in a spin-1/2
+ground state with an unpaired quasiparticle. Due to spin-orbit coupling, we
+resolve two flux-sensitive branches in the transmon spectrum, depending on the
+spin of the quasi-particle. A finite magnetic field shifts the two branches in
+energy, favoring one spin state and resulting in the anomalous Josephson
+effect. We demonstrate the excitation of the direct spin-flip transition using
+all-electrical control. Manipulation and control of the spin-flip transition
+enable the future implementation of charging energy protected Andreev spin
+qubits.",2208.09314v2
+2022-09-08,Kramers Fulde-Ferrell state and superconducting spin diode effect,"We study a novel Fulde-Ferrell equal-spin pairing state with opposite center
+of mass Cooper pair momentum for each spin polarization. This state respects
+time-reversal symmetry and is dubbed a Kramers Fulde-Ferrell (KFF) state. It
+can be realized in a one-dimensional system with spin-orbit coupling and
+nearest neighbor attraction. We find that the KFF state supports nonreciprocal
+spin transport for both bulk superconductor and Josephson junctions when
+inversion symmetry is broken. In addition to the spin Josephson diode effect,
+the charge transport is controlled by intriguing dynamics of bound states whose
+transitions can be manipulated by the length of the KFF superconductor. We
+discuss the relevance of the effective theory to the novel physics observed in
+monolayer Fe-based superconductor along line defects and domain walls, and the
+potential for using spins to make dissipationless superconducting spintronics.",2209.03520v3
+2023-02-22,Magnetic switching of spin-scattering centers in Dresselhaus [110] circuits,"Spin carriers subject to Dresselhaus [110] (D110) spin-orbit coupling (SOC)
+gather null spin phases in closed circuits, contrary to usual Rashba and
+Dresselhaus [001] SOC. We show that D110 spin phases can be activated in square
+circuits by introducing an in-plane Zeeman field, where localized field
+inhomogeneities act as effective spin-scattering centers. Our simulations show
+rich interference patterns in the quantum conductance, which work as maps for a
+geometric classification of the propagating spin states. We also find that
+disorder facilitates low-field implementations.",2302.11271v2
+2023-09-13,Spin-valley entangled quantum Hall states in graphene,"We investigate interaction-driven integer quantum Hall states realized in
+Landau levels of monolayer graphene when two out of its four nearly degenerate
+spin-valley flavors are filled. By employing a model that accounts for
+interactions beyond pure delta-functions as well as Zeeman and
+substrate-induced valley potentials, we demonstrate the existence of a delicate
+competition of several phases with spontaneous generation of spin-valley
+entanglement, akin to the spontaneous appearance of spin-orbit coupling driven
+by interactions. We encounter a particular phase that we term the
+entangled-Kekul\'{e}-antiferromagnet (E-KD-AF) which only becomes spin-valley
+entangled under the simultaneous presence of Zeeman and substrate potentials,
+because it gains energy by simultaneously canting in the spin and valley
+spaces, by combining features of a canted anti-ferromagnet and a canted
+Kekul\'{e} state. We quantify the degree of spin-valley entanglement of the
+many competing phases by computing their bipartite concurrence.",2309.07217v1
+2024-02-08,Modulation of magnetization in BiFeO$_3$ using circularly polarized light,"BiFeO$_3$ is a multiferroic material featuring ferroelectricity and
+noncollinear antiferromagnetism, the latter manifested as a cycloid of spin
+density. Definitive and efficient control of the characteristic spin texture of
+BiFeO$_3$ is attractive for emerging quantum devices. In this regard,
+crystal-field $d\rightarrow d$ excitations localized on Fe atomic sites in
+BiFeO$_3$ provide an avenue for manipulation of the spin texture as they induce
+a complex interplay among the spin, charge, and lattice degrees of freedom. In
+this work, the ab initio GW-BSE method is used to characterize these
+excitations within an excitonic picture. We find that the $d-d$ transitions
+appear as strongly bound, chiral, spin-flip excitons deep within the electronic
+band gap as a result of the intricate competition between the lattice
+potential, the antiferromagnetic ordering, the spin-orbit coupling, and the
+electron-hole interaction. Most crucially, these excitons are composed of
+electron-hole pairs with opposite spins that constitute almost all of their
+$\pm \hbar$ total angular momentum. These excitons of specific angular momentum
+can be selectively excited using circularly polarized light, consequently
+modulating the local magnetic moment giving rise to transient ferrimagnetism.",2402.05430v2
+2024-02-22,Non-relativistic spin splitting in compensated magnets that are not altermagnets,"The non-relativistic spin-splitting (NRSS) of electronic bands in
+""altermagnets"" has sparked renewed interest in antiferromagnets (AFMs) that
+have no net magnetization. However, altermagnets with collinear and compensated
+magnetism are not the only type of NRSS AFMs. In this study, we identify the
+symmetry conditions and characteristic signatures of a distinct group of NRSS
+AFMs that go beyond the description of altermagnets. These compounds exhibit a
+broken spin-degeneracy among the spin-polarized bands at the $\Gamma$ point in
+the absence of spin-orbit coupling (SOC). We use density functional theory
+calculations to validate these models in ternary magnetic nitrides,
+specifically MnXN$_2$ (X = Si, Ge, Sn), and their cation ordered variants. By
+removing the previous NRSS constraint on $\Gamma$, these compounds may
+facilitate the generation of spin currents without cancellation arising from
+the alternating spin polarizations. Our findings expand the scope of NRSS
+eligible materials.",2402.14321v1
+2005-03-25,Spin-Hall effect in two-dimensional mesoscopic hole systems,"The spin Hall effect in two dimensional hole systems is studied by using the
+four-terminal Landauer-B\""{u}ttiker formula with the help of Green functions.
+The spin Hall effect exists even when there are {\em not} any correlations
+between the spin-up and -down heavy holes (light holes) and when the
+$\Gamma$-point degeneracy of the heavy hole and light hole bands is lifted by
+the confinement or recovered by the strain. When only a heavy hole charge
+current without any spin polarization is injected through one lead, under right
+choice of lead voltages, one can get a pure heavy (light) hole spin current,
+combined with a possible impure light (heavy) hole spin current from another
+two leads. The spin Hall coefficients of both heavy and light holes depend on
+the Fermi energy, devise size and the disorder strength. It is also shown that
+the spin Hall effect of two dimensional hole systems is much more robust than
+that of electron systems with the Rashba spin-orbit coupling and the spin Hall
+coefficients do not decrease with the system size but tend to some nonzero
+values when the disorder strength is smaller than some critical value.",0503616v4
+2008-04-15,Multi-valley spin relaxation in the presence of high in-plane electric fields in $n$-type GaAs quantum wells,"Multi-valley spin relaxation in $n$-type GaAs quantum wells with in-plane
+electric field is investigated at high temperature by means of kinetic spin
+Bloch equation approach. The spin relaxation time first increases and then
+decreases with electric field, especially when the temperature is relatively
+low. We show that $L$ valleys play the role of a ``drain'' of the total spin
+polarization due to the large spin-orbit coupling in $L$ valleys and the strong
+$\Gamma$-$L$ inter-valley scattering, and thus can enhance spin relaxation of
+the total system effectively when the in-plane electric field is high. Under
+electric field, spin precession resulting from the electric-field-induced
+magnetic field is observed. Meanwhile, due to the strong $\Gamma$-$L$
+inter-valley scattering as well as the strong inhomogeneous broadening in $L$
+valleys, electron spins in $L$ valleys possess almost the same damping rate and
+precession frequency as those in $\Gamma$ valley. This feature still holds when
+a finite static magnetic field is applied in Voigt configuration, despite that
+the $g$-factor of $L$ valleys is much larger than that of $\Gamma$ valley.
+Moreover, it is shown that the property of spin precession of the whole system
+is dominated by electrons in $\Gamma$ valley. Temperature, magnetic field, and
+impurity can affect spin relaxation in low electric field regime. However, they
+are shown to have marginal influence in high electric field regime.",0804.2309v2
+2009-08-09,Topological Surface States Protected From Backscattering by Chiral Spin Texture,"Topological insulators are a new class of insulators in which a bulk gap for
+electronic excitations is generated by strong spin orbit coupling. These novel
+materials are distinguished from ordinary insulators by the presence of gapless
+metallic boundary states, akin to the chiral edge modes in quantum Hall
+systems, but with unconventional spin textures. Recently, experiments and
+theoretical efforts have provided strong evidence for both two- and
+three-dimensional topological insulators and their novel edge and surface
+states in semiconductor quantum well structures and several Bi-based compounds.
+A key characteristic of these spin-textured boundary states is their
+insensitivity to spin-independent scattering, which protects them from
+backscattering and localization. These chiral states are potentially useful for
+spin-based electronics, in which long spin coherence is critical, and also for
+quantum computing applications, where topological protection can enable
+fault-tolerant information processing. Here we use a scanning tunneling
+microscope (STM) to visualize the gapless surface states of the
+three-dimensional topological insulator BiSb and to examine their scattering
+behavior from disorder caused by random alloying in this compound. Combining
+STM and angle-resolved photoemission spectroscopy, we show that despite strong
+atomic scale disorder, backscattering between states of opposite momentum and
+opposite spin is absent. Our observation of spin-selective scattering
+demonstrates that the chiral nature of these states protects the spin of the
+carriers; they therefore have the potential to be used for coherent spin
+transport in spintronic devices.",0908.1247v1
+2010-08-15,Spin relaxation in $n$-type (111) GaAs quantum wells,"We investigate the spin relaxation limited by the D'yakonov-Perel' mechanism
+in $n$-type (111) GaAs quantum wells, by means of the kinetic spin Bloch
+equation approach. In (111) GaAs quantum wells, the in-plane effective magnetic
+field from the D'yakonov-Perel' term can be suppressed to zero on a special
+momentum circle under the proper gate voltage, by the cancellation between the
+Dresselhaus and Rashba spin-orbit coupling terms. When the spin-polarized
+electrons mainly distribute around this special circle, the in-plane
+inhomogeneous broadening is small and the spin relaxation can be suppressed,
+especially for that along the growth direction of quantum well. This
+cancellation effect may cause a peak (the cancellation peak) in the density or
+temperature dependence of the spin relaxation time. In the density
+(temperature) dependence, the interplay between the cancellation peak and the
+ordinary density (Coulomb) peak leads to rich features of the density
+(temperature) dependence of the spin relaxation time. The effect of impurities,
+with its different weights on the cancellation peak and the Coulomb peak in the
+temperature dependence of the spin relaxation, is revealed. We also show the
+anisotropy of the spin relaxation with respect to the spin-polarization
+direction.",1008.2516v1
+2012-08-02,"Importance of exchange-anisotropy and superexchange for the spin-state transitions in LnCoO3 (Ln=La,Y,RE) cobaltates","Spin-state transitions are the hallmark of rare-earth cobaltates. In order to
+understand them, it is essential to identify all relevant parameters which
+shift the energy balance between spin states, and determine their trends. We
+find that \Delta, the eg-t2g crystal-field splitting, increases by ~250 meV
+when increasing pressure to 8 GPa and by about 150 meV when cooling from 1000K
+to 5K. It changes, however, by less than 100 meV when La is substituted with
+another rare earth. Also the Hund's rule coupling J_avg is about the same in
+systems with very different spin-state transition temperature, like LaCoO3 and
+EuCoO3. Consequently, in addition to \Delta and J_avg, the Coulomb-exchange
+anisotropy \Delta J_ avg and the super-exchange energy-gain \Delta E_SE play a
+crucial role, and are comparable with spin-state dependent relaxation effects
+due to covalency. We show that in the LnCoO3 series, with Ln=Y or a rare earth
+(RE), super-exchange progressively stabilizes a low-spin ground state as the
+Ln^{3+} ionic radius decreases. We give a simple model to describe spin-state
+transitions and show that, at low temperature, the formation of isolated
+high-spin/low-spin pairs is favored, while in the high-temperature phase, the
+most likely homogeneous state is high-spin, rather than intermediate spin. An
+orbital-selective Mott state could be a fingerprint of such a state.",1208.0425v1
+2016-07-14,Quantum many-body theory for electron spin decoherence in nanoscale nuclear spin baths,"Decoherence of electron spins in nanoscale systems is important to quantum
+technologies such as quantum information processing and magnetometry. It is
+also an ideal model problem for studying the crossover between quantum and
+classical phenomena. At low temperatures or in light-element materials where
+the spin-orbit coupling is weak, the phonon scattering in nanostructures is
+less important and the fluctuations of nuclear spins become the dominant
+decoherence mechanism for electron spins. Since 1950s, semiclassical noise
+theories have been developed for understanding electron spin decoherence. In
+spin-based solid-state quantum technologies, the relevant systems are in the
+nanometer scale and the nuclear spin baths are quantum objects which require a
+quantum description. Recently, quantum pictures have been established to
+understand the decoherence and quantum many-body theories have been developed
+to quantitatively describe this phenomenon. Anomalous quantum effects have been
+predicted and some have been experimentally confirmed. A systematically
+truncated cluster correlation expansion theory has been developed to account
+for the many-body correlations in nanoscale nuclear spin baths that are built
+up during the electron spin decoherence. The theory has successfully predicted
+and explained a number of experimental results in a wide range of physical
+systems. In this review, we will cover these recent progresses. The limitations
+of the present quantum many-body theories and possible directions for future
+development will also be discussed.",1607.03993v3
+2017-02-20,Valley dependent anisotropic spin splitting in silicon quantum dots,"Spin qubits hosted in silicon (Si) quantum dots (QD) are attractive due to
+their exceptionally long coherence times and compatibility with the silicon
+transistor platform. To achieve electrical control of spins for qubit
+scalability, recent experiments have utilized gradient magnetic fields from
+integrated micro-magnets to produce an extrinsic coupling between spin and
+charge, thereby electrically driving electron spin resonance (ESR). However,
+spins in silicon QDs experience a complex interplay between spin, charge, and
+valley degrees of freedom, influenced by the atomic scale details of the
+confining interface. Here, we report experimental observation of a valley
+dependent anisotropic spin splitting in a Si QD with an integrated micro-magnet
+and an external magnetic field. We show by atomistic calculations that the
+spin-orbit interaction (SOI), which is often ignored in bulk silicon, plays a
+major role in the measured anisotropy. Moreover, inhomogeneities such as
+interface steps strongly affect the spin splittings and their valley
+dependence. This atomic-scale understanding of the intrinsic and extrinsic
+factors controlling the valley dependent spin properties is a key requirement
+for successful manipulation of quantum information in Si QDs.",1702.06210v2
+2020-07-04,Low-symmetry topological materials for large charge-to-spin interconversion: The case of transition metal dichalcogenide monolayers,"The spin polarization induced by the spin Hall effect (SHE) in thin films
+typically points out of the plane. This is rooted on the specific symmetries of
+traditionally studied systems, not in a fundamental constraint. Recently,
+experiments on few-layer ${\rm MoTe}_2$ and ${\rm WTe}_2$ showed that the
+reduced symmetry of these strong spin-orbit coupling materials enables a new
+form of {\it canted} spin Hall effect, characterized by concurrent in-plane and
+out-of-plane spin polarizations. Here, through quantum transport calculations
+on realistic device geometries, including disorder, we predict a very large
+gate-tunable SHE figure of merit $\lambda_s\theta_{xy}\sim 1\text{--}50$ nm in
+${\rm MoTe}_2$ and ${\rm WTe}_2$ monolayers that significantly exceeds values
+of conventional SHE materials. This stems from a concurrent long spin diffusion
+length ($\lambda_s$) and charge-to-spin interconversion efficiency as large as
+$\theta_{xy} \approx 80$\%, originating from momentum-invariant (persistent)
+spin textures together with large spin Berry curvature along the Fermi contour,
+respectively. Generalization to other materials and specific guidelines for
+unambiguous experimental confirmation are proposed, paving the way towards
+exploiting such phenomena in spintronic devices. These findings vividly
+emphasize how crystal symmetry and electronic topology can govern the intrinsic
+SHE and spin relaxation, and how they may be exploited to broaden the range and
+efficiency of spintronic materials and functionalities.",2007.02053v2
+2020-08-21,Correlation of interface transmission in THz spintronic emitters with spin mixing conductance in spin pumping experiments,"The field of THz spintronics is a novel direction in the research field of
+spintronics that combines magnetism with optical physics and ultrafast
+photonics. The experimental scheme of the field involves the use of femtosecond
+laser pulses to trigger ultrafast spin and charge dynamics in bilayers composed
+of ferromagnetic (FM) and non-magnetic (NM) thin films where the NM layer
+features a strong spin-orbit coupling. The key technological and scientific
+challenges of THz spintronic emitters is to increase their intensity and
+frequency bandwidth. To achieve this the control of the source of the
+radiation, namely the transport of the ultrafast spin current is required.
+However, the transfer of a spin current from a FM to a NM layer is a highly
+interface-sensitive effect. In this work we study the properties of the spin
+current transport through the interface measuring the strength of the THz
+emission and compare it to the effective spin mixing conductance, one of the
+key concepts in the spin current transport through interfaces. The results show
+an enhancement of the spin mixing conductance for interfaces with higher degree
+of epitaxy similarly to the improvement of the THz emission. The
+proportionality between spin mixing conductance and THz emission can define new
+directions in engineering the emission of spintronic THz emitters.",2008.09537v1
+2020-08-27,Focused linearly-polarized light scattering from a silver nanowire: Experimental characterization of optical spin-Hall effect,"Spin-orbit interactions (SOI) are a set of sub-wavelength optical phenomenon
+in which spin and spatial degrees of freedom of light are intrinsically
+coupled. One of the unique example of SOI, spin-Hall effect of light (SHEL) has
+been an area of extensive research with potential applications in spin
+controlled photonic devices as well as emerging fields of spinoptics and
+spintronics. Here, we report our experimental study on SHEL due to forward
+scattering of focused linearly polarized Gaussian and Hermite-Gaussian
+($\textrm{HG}_{10}$) beams from a silver nanowire (AgNW). Spin dependent
+anti-symmetric intensity patterns are obtained when the polarization of the
+scattered light is analysed. The corresponding spin-Hall signal is obtained by
+computing the far-field longitudinal spin density ($s_3$). Furthermore, by
+comparing the $s_3$ distributions, significant enhancement of the spin-Hall
+signal is found for $\textrm{HG}_{10}$ beam compared to Gaussian beam. The
+investigation of the optical fields at the focal plane of the objective lens
+reveals the generation of longitudinally spinning fields as the primary reason
+for the effects. The experimental results are corroborated by 3-dimensional
+numerical simulations. The results lead to better understanding of SOI and can
+have direct implications on chip-scale spin assisted photonic devices.",2008.12245v2
+2019-06-12,Spin transport and Spin Tunnelling Magneto-Resistance (STMR) of F$|$NCSC$|$F spin valve,"In this work, we study the spin transport at the
+Ferromagnet$|$Noncentrosymmetric Superconductor (F$|$NCSC) junction of a
+Ferromagnet$|$Noncentrosymmetric Superconductor$|$Ferromagnet (F$|$NCSC$|$F)
+spin valve. We investigate the Tunnelling Spin-Conductance (TSC), spin current
+and Spin Tunnelling Magneto-Resistance (STMR), and their dependence on various
+important parameters like Rashba Spin-Orbit Coupling (RSOC), strength and
+orientation of magnetization, an external in-plane magnetic field, barrier
+strength and a significant Fermi Wavevector Mismatch (FWM) at the ferromagnetic
+and superconducting regions. The study has been carried out for different
+singlet-triplet mixing of the NCSC gap parameter. We develop Bogoliubov-de
+Gennes (BdG) Hamiltonian and use the extended Blonder - Tinkham - Klapwijk
+(BTK) approach along with the scattering matrix formalism to calculate the
+scattering coefficients. Our results strongly suggest that the TSC is highly
+dependent on RSOC, magnetization strength and its orientation, and
+singlet-triplet mixing of the gap parameter. It is observed that NCSC with
+moderate RSOC shows maximum conductance for a partially opaque barrier in
+presence of low external magnetic field. For a strongly opaque barrier and a
+nearly transparent barrier a moderate value and a low value of field
+respectively are found to be suitable. Moreover, NCSC with large singlet
+component is appeared to be useful. In addition, for NCSC with large RSOC and
+low magnetization strength, a giant STMR ($\%$) is observed. We have also seen
+that the spin current is strongly magnetization orientation dependent. With the
+increase in bias voltage spin current increases in transverse direction, but
+the component along the direction of flow is almost independent.",1906.05081v1
+2020-06-05,Competing Antiferromagnetic-Ferromagnetic States in $\it{d^7}$ Kitaev Honeycomb Magnet,"The Kitaev model is a rare example of an analytically solvable and physically
+instantiable Hamiltonian yielding a topological quantum spin liquid ground
+state. Here we report signatures of Kitaev spin liquid physics in the honeycomb
+magnet $Li_3Co_2SbO_6$, built of high-spin $\it{d^7}$ ($Co^{2+}$) ions, in
+contrast to the more typical low-spin $\it{d^5}$ electron configurations in the
+presence of large spin-orbit coupling. Neutron powder diffraction measurements,
+heat capacity, and magnetization studies support the development of a
+long-range antiferromagnetic order space group of $\it{C_C}2/\it{m}$, below
+$\it{T_N}$ = 11 K at $\it{\mu_0H}$ = 0 T. The magnetic entropy recovered
+between $\it{T}$ = 2 K and 50 K is estimated to be 0.6Rln2, in good agreement
+with the value expected for systems close to a Kitaev quantum spin liquid
+state. The temperature-dependent magnetic order parameter demonstrates a
+$\beta$ value of 0.19(3), consistent with XY anisotropy and in-plane ordering,
+with Ising-like interactions between layers. Further, we observe a spin-flop
+driven crossover to ferromagnetic order with space group of $\it{C}2/\it{m}$
+under an applied magnetic field of $\it{\mu_0H}$ $\approx$ 0.7 T at $\it{T}$ =
+2 K. Magnetic structure analysis demonstrates these magnetic states are
+competing at finite applied magnetic fields even below the spin-flop
+transition. Both the $\it{d^7}$ compass model, a quantitative comparison of the
+specific heat of $Li_3Co_2SbO_6$, and related honeycomb cobaltates to the
+anisotropic Kitaev model further support proximity to a Kitaev spin liquid
+state. This material demonstrates the rich playground of high-spin $\it{d^7}$
+systems for spin liquid candidates, and complements known $\it{d^5}$ Ir- and
+Ru-based materials.",2006.03724v1
+2021-06-12,Spin pumping and inverse spin Hall effect in CoFeB/C$_{60}$ bilayers,"Pure spin current based research is mostly focused on ferromagnet (FM)/heavy
+metal (HM) system. Because of the high spin orbit coupling (SOC) these HMs
+exhibit short spin diffusion length and therefore possess challenges for device
+application. Low SOC (elements of light weight) and large spin diffusion length
+make the organic semiconductors (OSCs) suitable for future spintronic
+applications. From theoretical model it is explained that, due to $\pi$ -
+$\sigma$ hybridization the curvature of the C$_{60}$ molecules may increase the
+SOC strength. Here, we have investigated spin pumping and inverse spin hall
+effect (ISHE) in CoFeB/C$_{60}$ bilayer system using coplanar wave guide based
+ferromagnetic resonance (CPW-FMR) set-up. We have performed angle dependent
+ISHE measurement to disentangle the spin rectification effects for example
+anisotropic magnetoresistance, anomalous Hall effect etc. Further, effective
+spin mixing conductance (g$_{eff}^{\uparrow\downarrow}$) and spin Hall angle
+($\theta_{SH}$) for C$_{60}$ have been reported here. The evaluated value for
+$\theta_{SH}$ is 0.055.",2106.06829v2
+2022-07-27,Spin-Neutral Tunneling Anomalous Hall Effect,"Anomalous Hall effect (AHE) is a fundamental spin-dependent transport
+property that is widely used in spintronics. It is generally expected that
+currents carrying net spin polarization are required to drive the AHE. Here we
+demonstrate that, in contrast to this common expectation, a spin-neutral
+tunneling AHE (TAHE), i.e. a TAHE driven by spin-neutral currents, can be
+realized in an antiferromagnetic (AFM) tunnel junction where an AFM electrode
+with a non-spin-degenerate Fermi surface and a normal metal electrode are
+separated by a non-magnetic barrier with strong spin-orbit coupling (SOC). The
+symmetry mismatch between the AFM electrode and the SOC barrier results in an
+asymmetric spin-dependent momentum filtering of the spin-neutral longitudinal
+current generating the transverse Hall current in each electrode. We predict a
+sizable spin-neutral TAHE in an AFM tunnel junction with a RuO$_{2}$-type AFM
+electrode and a SnTe-type SOC barrier and show that the Hall currents are
+reversible by the N\'eel vector switching. With the Hall angle being comparable
+to that in conventional AHE bulk materials, the predicted spin-neutral TAHE can
+be used for the N\'eel vector detection in antiferromagnetic spintronics.",2207.13376v1
+2023-01-19,RIXS observation of bond-directional nearest-neighbor excitations in the Kitaev material Na$_2$IrO$_3$,"Spin-orbit coupling locks spin direction and spatial orientation and
+generates, in semi-classical magnets, a local spin easy-axis and associated
+ordering. Quantum spin-1/2's defy this fate: rather than spins becoming locally
+anisotropic, the spin-spin interactions do. Consequently interactions become
+dependent on the spatial orientation of bonds between spins, prime theoretical
+examples of which are Kitaev magnets. Bond-directional interactions imply the
+existence of bond-directional magnetic modes, predicted spin excitations that
+render crystallographically equivalent bonds magnetically inequivalent, which
+yet have remained elusive experimentally. Here we show that resonant inelastic
+x-ray scattering allows us to explicitly probe the bond-directional character
+of magnetic excitations. To do so, we use a scattering plane spanned by one
+bond and the corresponding spin component and scan a range of momentum transfer
+that encompasses multiple Brillouin zones. Applying this approach to
+Na$_2$IrO$_3$ we establish the different bond-directional characters of
+magnetic excitations at 10 meV and 45 meV. Combined with the observation of
+spin-spin correlations that are confined to a single bond, this experimentally
+validates the Kitaev character of exchange interactions long proposed for this
+material.",2301.08340v1
+2019-08-04,Experimental observation of coupled valley and spin Hall effect in p-doped WSe2 devices,"Giant spin Hall effect (GSHE) has been observed in heavy metal materials such
+as Ta, Pt, and W, where spins are polarized in the surface plane and
+perpendicular to the charge current direction. Spins generated in these
+materials have successfully switched magnets with in-plane magnetic anisotropy
+(IMA) and perpendicular magnetic anisotropy (PMA) through spin orbit torque
+(SOT) mechanism. It is generally accepted that PMA magnets are preferred over
+IMA magnets in data storage applications owing to their large thermal stability
+even at ultra scaled dimensions. However, SOT switching of PMA magnets by
+conventional GSHE materials requires either a small external magnetic field, a
+local dipolar field, or introducing tilted anisotropy to break the symmetry
+with respect to the magnetization. To deterministically switch a PMA without
+any additional assistance, nonconventional GSHE materials that can generate
+spins with polarization perpendicular to the surfaces are needed. Several
+monolayer transition metal dichalcogenides (TMDs) have been predicted to
+generate such out of plane spins due to their 2D nature and unique band
+structures. Interestingly, opposite spins are locked to their respective
+sub-band in each K valley of the TMD valence band with substantially large
+energy splitting, which enables polarized spins to be accessible through
+electrical gating and spatially separated by electric field through the valley
+Hall effect (VHE). Therefore, spatial separation and accumulation of spins in
+these 2D TMDs are uniquely referred to as coupled valley and spin Hall effect.
+Here, we report an experiment of electrical generation of spin current with out
+of plane polarization in monolayer WSe2 and detection of spin signals through a
+nonlocal spin valve structure built on a lateral graphene spin diffusion
+channel that partially overlaps with WSe2.",1908.01396v1
+2004-03-16,Calculated spin-orbit splitting of all diamond-like and zinc-blende semiconductors: Effects of p1/2 local orbitals and chemical trends,"e have calculated the spin-orbit (SO) splitting $\Delta_{SO}=\epsilon
+(\Gamma_{8v}) - \epsilon (\Gamma_{7v})$ for all diamond-like group IV and
+zinc-blende group III-V, II-VI, and I-VII semiconductors using the full
+potential linearized augmented plane wave method within the local density
+approximation. The SO coupling is included using the second variation
+procedure, including the $p_{1/2}$ local orbitals. The calculated SO splittings
+are in very good agreement with available experimental data. The corrections
+due to the inclusion of the $p_{1/2}$ local orbital are negligible for lighter
+atoms, but can be as large as $\sim$250 meV for 6$p$ anions. We find that (i)
+the SO splittings increase monotonically when anion atomic number increases;
+(ii) the SO splittings increase with the cation atomic number when the compound
+is more covalent such as in most III-V compounds; (iii) the SO splittings
+decrease with the cation atomic number when the compound is more ionic, such as
+in II-VI and the III-nitride compounds; (iv) the common-anion rule, which
+states that the variation of $\Delta_{SO}$ is small for common-anion systems,
+is usually obeyed, especially for ionic systems, but can break down if the
+compounds contain second-row elements such as BSb;(v) for IB-VII compounds, the
+$\Delta_{SO}$ is small and in many cases negative and it does not follow the
+rules discussed above. These trends are explained in terms of atomic SO
+splitting, volume deformation-induced charge renormalization, and cation-anion
+$p$--$d$ couplings.",0403409v2
+2015-06-11,Filling-Enforced Quantum Band Insulators in Spin-Orbit Coupled Crystals,"While band insulators are usually described in wavevector space in terms of
+fully filled bands, they are sometimes also described in terms of a
+complementary Wannier picture in which electrons occupy localized, atom-like
+orbitals. Under what conditions does the latter picture break down? The
+presence of irremovable quantum entanglement between different sites can
+obstruct a localized orbital description, which occurs in systems like Chern
+and topological insulators. We collectively refer to such states as Quantum
+Band Insulators (QBIs). Here we report the theoretical discovery of a
+filling-enforced QBI - that is, a free electron insulator in which the band
+filling is smaller than the minimum number dictated by the atomic picture.
+Consequently such insulators have no representation in terms of filling
+localized orbitals and must be QBIs. This is shown to occur in models of
+certain cubic crystals with non-symmorphic space groups. Like topological
+insulators, filling-enforced QBIs require spin-orbit coupling. However, in
+contrast, they do not typically exhibit protected surface states. Instead their
+nontrivial nature is revealed by studying the quantum entanglement of their
+ground state wavefunction.",1506.03816v3
+2016-09-16,Ab initio calculations to support accurate modelling of the rovibronic spectroscopy calculations of vanadium monoxide (VO),"Accurate knowledge of the rovibronic near-infrared and visible spectra of
+vanadium monoxide (VO) is very important for studies of cool stellar and hot
+planetary atmospheres. Here, the required ab initio dipole moment and
+spin-orbit coupling curves for VO are produced. This data forms the basis of a
+new VO line list considering 13 different electronic states and containing over
+277 million transitions. Open shell transition, metal diatomics are challenging
+species to model through ab initio quantum mechanics due to the large number of
+low-lying electronic states, significant spin-orbit coupling and strong static
+and dynamic electron correlation. Multi-reference configuration interaction
+methodologies using orbitals from a complete active space self-consistent-field
+(CASSCF) calculation are the standard technique for these systems. We use
+different state-specific or minimal-state CASSCF orbitals for each electronic
+state to maximise the calculation accuracy. The off-diagonal dipole moment
+controls the intensity of electronic transitions. We test finite-field
+off-diagonal dipole moments, but found that (1) the accuracy of the excitation
+energies were not sufficient to allow accurate dipole moments to be evaluated
+and (2) computer time requirements for perpendicular transitions were
+prohibitive. The best off-diagonal dipole moments are calculated using
+wavefunctions with different CASSCF orbitals.",1609.05073v1
+2004-10-12,Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system,"We report the experimental observation of the spin-Hall effect in a
+two-dimensional (2D) hole system with Rashba spin-orbit coupling.
+  The 2D hole layer is a part of a p-n junction light-emitting diode with a
+specially designed co-planar geometry which allows an angle-resolved
+polarization detection at opposite edges of the 2D hole system. In equilibrium
+the angular momenta of the Rashba split heavy hole states lie in the plane of
+the 2D layer. When an electric field is applied across the hole channel a non
+zero out-of-plane component of the angular momentum is detected whose sign
+depends on the sign of the electric field and is opposite for the two edges.
+Microscopic quantum transport calculations show only a weak effect of disorder
+suggesting that the clean limit spin-Hall conductance description (intrinsic
+spin-Hall effect) might apply to our system.",0410295v3
+2011-07-11,Influence of Impurity Scattering on the Conductance Anomalies of Quantum Point Contacts with Lateral Spin-Orbit Coupling,"We have recently shown that asymmetric lateral spin orbit coupling (LSOC)
+resulting from the lateral in-plane electric field of the confining potential
+of a side-gated quantum point contact (QPC) can be used to create a strongly
+spin- polarized current by purely electrical means1 in the absence of applied
+magnetic field. Using the non-equilibrium Green function formalism (NEGF)
+analysis of a small model QPC2, three ingredients were found to be essential to
+generate the strong spin polarization: an asymmetric lateral confinement, a
+LSOC induced by the lateral confining potential of the QPC, and a strong
+electron-electron (e-e) interaction. In this paper, NEGF is used to study how
+the spin polarization is affected by the presence of impurities in the central
+portion of the QPC. It is found that the number, location, and shape of the
+conductance anomalies, occurring below the first quantized conductance plateau
+(G0=2e2/h), are strongly dependent on the nature (attractive or repulsive) and
+the locations of the impurities. We show that the maximum of the conductance
+spin polarization is affected by the presence of impurities. For QPCs with
+impurities off-center, a conductance anomaly appears below the first integer
+step even for the case of symmetric bias on the two side gates. These results
+are of practical importance if QPCs in series are to be used to fabricate
+all-electrical spin valves with large ON/OFF conductance ratio.",1107.1923v1
+2012-09-15,Phase diagrams of noncentrosymmetric superconductors,"Noncentrosymmetric superconductors with various types of pairing interactions
+are systematically examined with particular focus on phenomena that originate
+from the differences between Fermi surfaces split by a strong spin-orbit
+coupling. In particular, when the spin-orbit coupling increases and one of the
+split Fermi surfaces disappears, the phase diagram and the structure of the gap
+function change drastically. For example, we examine the conditions for the
+transition from full-gap states to line-node states (FLT), which may explain
+the differences in the experimental results between the noncentrosymmetric
+superconductors Li2Pd3B and Li2Pt3B discovered recently. The dominant pairing
+interactions and gap functions can be predicted to some extent by comparing the
+theoretical and experimental results for these compounds. For example, if the
+FLT occurs by replacing Pd with Pt, it is most likely that the
+superconductivity is mainly induced by charge-charge interactions, and if this
+is the case, the superconductivities in Li2Pd3B and Li2Pt3B are an s-wave
+nearly spin-triplet state and a d-wave state that has both spin-singlet and
+triplet components of comparable weights, respectively. Comparing the
+theoretical phase diagrams in simple models, it is found that the FLT occurs in
+a wider realistic parameter region for charge-charge interactions, i.e., where
+short-range Coulomb repulsion is strong and p-wave and d-wave interactions are
+attractive, while it occurs in narrower rather unrealistic parameter regions
+for interactions of magnetic origin. It is also found that d-wave spin-triplet
+pairing may occur, when pairing interactions are of magnetic origin and
+anisotropic in spin space.",1209.3367v4
+2020-12-31,Dispersively probed microwave spectroscopy of a silicon hole double quantum dot,"Owing to ever increasing gate fidelities and to a potential transferability
+to industrial CMOS technology, silicon spin qubits have become a compelling
+option in the strive for quantum computation. In a scalable architecture, each
+spin qubit will have to be finely tuned and its operating conditions accurately
+determined. In this prospect, spectroscopic tools compatible with a scalable
+device layout are of primary importance. Here we report a two-tone spectroscopy
+technique providing access to the spin-dependent energy-level spectrum of a
+hole double quantum dot defined in a split-gate silicon device. A first
+GHz-frequency tone drives electric-dipole spin resonance enabled by the
+valence-band spin-orbit coupling. A second lower-frequency tone (approximately
+500 MHz) allows for dispersive readout via rf-gate reflectometry. We compare
+the measured dispersive response to the linear response calculated in an
+extended Jaynes-Cummings model and we obtain characteristic parameters such as
+g-factors and tunnel/spin-orbit couplings for both even and odd occupation.",2012.15588v2
+2020-10-03,Direct band gap and strong Rashba effect in van der Waals heterostructures of InSe and Sb single layers,"Van der Waals heterostructures formed by stacking different types of 2D
+materials are attracting increasing attention due to new emergent physical
+properties such as interlayer excitons. Recently synthesized atomically thin
+indium selenide (InSe) and antimony (Sb) individually exhibit interesting
+electronic properties such as high electron mobility in the former and high
+hole mobility in the latter. In this work, we present a first-principles
+investigation on the stability and electronic properties of ultrathin bilayer
+heterostructures composed of InSe and Sb single layers. The calculated
+electronic band structures reveal a direct band gap semiconducting nature of
+the InSe/Sb heterostructures independent of stacking pattern. Taking spin-orbit
+coupling into account, we find a large Rashba spin splitting at the bottom of
+conduction band, which originates from the atomic spin-orbit coupling with the
+symmetry breaking in the heterostructure. The strength of the Rashba spin
+splitting can be tuned by applying in-plane biaxial strain or an out-of-plane
+external electric field. The presence of large Rashba spin splitting together
+with a suitable band gap in InSe/Sb bilayer heterostructures make them
+promising candidates for spin field-effect transistor and optoelectronic device
+applications.",2010.01355v2
+2021-04-08,Spin-orbit coupling induced ultra-high harmonic generation from magnetic dynamics,"The recent boost in data transfer rates puts a daring strain on information
+technology. Sustaining such a growth rate requires the development of sources,
+detectors and systems working in the so-called TeraHertz (THz) gap covering the
+frequency window from 0.1 to 10 THz (1 THz = 10$^{12}$~Hz). This gap represents
+a challenge for conventional electronic devices due to carrier transit delays
+($\sim$1-10ps), as well as for photonic devices due to thermal fluctuations
+(300K$\sim$6THz). Nonetheless, designing efficient, room-temperature THz
+sources would constitute a key enabler to applications spanning from
+high-resolution imaging to extreme wide band wireless communication. Whereas
+high-harmonic generation in solid is usually limited to less than ten
+harmonics, broadband THz emission has been demonstrated using laser-induced
+superdiffusive spin currents in magnetic bilayers composed of a ferromagnet
+deposited on top of a noble metal. While promising, this technique presents the
+major disadvantage of necessitating optical pumping and hence lacks
+scalability. Here, we demonstrate that extremely high harmonic emission can be
+achieved by exploiting conventional spin pumping, without the need of optical
+excitation. We show that when the spin-orbit coupling strength is close to the
+s-d exchange energy, a strongly non linear regime resulting from resonant spin
+flip scattering occurs leading to the generation of a thousand of harmonics at
+realistic antiferromagnetic precession frequencies, thereby enhancing both spin
+and charge dynamics by two orders of magnitude, and allowing for an emission at
+frequencies above 300 THz.",2104.04001v1
+2016-09-30,Non-collinear Order and Spin-Orbit Coupling in Sr$_3$ZnIrO$_6$,"Sr$_{3}$ZnIrO$_{6}$ is an effective spin one-half Mott insulating iridate
+belonging to a family of magnets which includes a number of quasi-one
+dimensional systems as well as materials exhibiting three dimensional order.
+Here we present the results of an extensive investigation into the magnetism
+including heat capacity, a.c. susceptibility, muon spin rotation ($\mu$SR),
+neutron diffraction and inelastic neutron scattering on the same sample. It is
+established that the material exhibits a transition at about $17$ K into a
+three-dimensional antiferromagnetic structure with propagation vector
+$\boldsymbol{k}=(0,\frac{1}{2},1)$ in the hexagonal setting of R$\bar{3}$c and
+non-collinear moments of $0.87$$\mu_B$ on Ir$^{4+}$ ions. Further we have
+observed a well defined powder averaged spin wave spectrum with zone boundary
+energy of $\sim 5$ meV at $5$ K. We stress that a theoretical analysis shows
+that the observed non-collinear magnetic structure arises from anisotropic
+inter- and intra- chain exchange which has its origin in significant spin-orbit
+coupling. The model can satisfactorily explain the observed spin wave
+excitations.",1610.00038v2
+2021-07-29,Superconducting triplet pairings and anisotropic magnetoresistance effects in ferromagnet/superconductor/ferromagnet double-barrier junctions,"Ferromagnetic spin valves offer the key building blocks to integrate giant-
+and tunneling-magnetoresistance effects into spintronics devices. Starting from
+a generalized Blonder-Tinkham-Klapwijk approach, we theoretically investigate
+the impact of interfacial Rashba and Dresselhaus spin-orbit couplings on the
+tunneling conductance, and thereby the magnetoresistance characteristics, of
+ferromagnet/superconductor/ferromagnet spin-valve junctions embedding thin
+superconducting spacers between the either parallel or antiparallel magnetized
+ferromagnets. We focus on the unique interplay between usual electron
+tunnelings-that fully determine the magnetoresistance in the normal-conducting
+state-and the peculiar Andreev reflections in the superconducting state. In the
+presence of interfacial spin-orbit couplings, special attention needs to be
+paid to the spin-flip (""unconventional"") Andreev-reflection process that is
+expected to induce superconducting triplet correlations in proximitized
+regions. As a transport signature of these triplet pairings, we detect
+conductance double peaks around the singlet-gap energy, reflecting the
+competition between the singlet and an additionally emerging triplet gap; the
+latter is an effective superconducting gap that can be ascribed to the
+formation of triplet Cooper pairs through interfacial spin-flip scatterings
+(i.e., to the generation of an effective triplet-pairing term in the order
+parameter). We thoroughly analyze the Andreev reflections' role in connection
+with superconducting magnetoresistance phenomena, and eventually unravel huge
+conductance and magnetoresistance magnetoanisotropies-easily exceeding their
+normal-state counterparts by several orders of magnitude-as another
+experimentally accessible fingerprint of unconventional Andreev reflections.",2107.13818v2
+2022-02-24,Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK(Fe$_{0.96}$Ni$_{0.04}$)$_4$As$_4$ with Spin-Vortex Crystal Order,"The spin-orbit coupling (SOC) is a key to understand the magnetically driven
+superconductivity in iron-based superconductors, where both local and itinerant
+electrons are present and the orbital angular momentum is not completely
+quenched. Here, we report a neutron scattering study on the bilayer compound
+CaK(Fe$_{0.96}$Ni$_{0.04}$)$_4$As$_4$ with superconductivity coexisting with a
+non-collinear spin-vortex crystal magnetic order that preserves the tetragonal
+symmetry of Fe-Fe plane. In the superconducting state, two spin resonance modes
+with odd and even $L$ symmetries due to the bilayer coupling are found similar
+to the undoped compound CaKFe$_4$As$_4$ but at lower energies. Polarization
+analysis reveals that the odd mode is $c-$axis polarized, and the low-energy
+spin anisotropy can persist to the paramagnetic phase at high temperature,
+which closely resembles other systems with in-plane collinear and $c-$axis
+biaxial magnetic orders. These results provide the missing piece of the puzzle
+on the SOC effect in iron-pnictide superconductors, and also establish a common
+picture of $c-$axis preferred magnetic excitations below $T_c$ regardless of
+the details of magnetic pattern or lattice symmetry.",2202.11933v1
+2023-03-01,Rashba spin-orbit coupling enhanced magnetoresistance in junctions with one ferromagnet,"We explain how Rashba spin-orbit coupling (SOC) in a two-dimensional electron
+gas (2DEG), or in a conventional $s$-wave superconductor, can lead to a large
+magnetoresistance even with one ferromagnet. However, such enhanced
+magnetoresistance is not generic and can be nonmonotonic and change its sign
+with Rashba SOC. For an in-plane rotation of magnetization, it is typically
+negligibly small for a 2DEG and depends on the perfect transmission which
+emerges from a spin-parity-time symmetry of the scattering states, while this
+symmetry is generally absent from the Hamiltonian of the system. The key
+difference from considering the normal-state magnetoresistance is the presence
+of the spin-dependent Andreev reflection at superconducting interfaces. In the
+fabricated junctions of quasi-2D van der Waals ferromagnets with conventional
+$s$-wave superconductors (Fe$_{0.29}$TaS$_2$/NbN) we find another example of
+enhanced magnetoresistance where the presence of Rashba SOC reduces the
+effective interfacial strength and is responsible for an equal-spin Andreev
+reflection. The observed nonmonotonic trend in the out-of-plane
+magnetoresistance with the interfacial barrier is an evidence for the
+proximity-induced equal-spin-triplet superconductivity.",2303.00185v1
+2023-11-14,Generation of electric current and electromotive force by an antiferromagnetic domain wall,"Dynamic magnetic textures may transfer the angular moment from the varying in
+time antiferromagnetic order to spins of conduction electrons. Due to the spin
+orbit coupling (SOC) these spin excitations can induce the electric current of
+conduction electrons. We calculated the electric current and the electromotive
+force (EMF) which are produced by a domain wall (DW) moving parallel to the
+magnetically compensated interface between an antiferromagnetic insulator
+(AFMI) and a two-dimensional spin orbit coupled metal. Spins of conduction
+electrons interact with localized spins of a collinear AFMI through the
+interface exchange interaction. The Keldysh formalism of nonequilibrium Green
+functions was applied for the analysis of this system. It is shown that a Bloch
+DW generates the current perpendicular to the DW motion direction. At the same
+time a N\'{e}el DW creates the electric potential which builds up across the
+wall. The total charge which is pumped by a Bloch DW can be expressed in terms
+of a topologically invariant charge quantum. The latter does not depend on
+variations of DW's velocity and shape. These effects increase dramatically when
+the Fermi energy approaches the van Hove singularity of the Fermi surface. The
+obtained results are important for the electrical detection and control of
+dynamic magnetic textures in antiferromagnets.",2311.08067v1
+2024-01-15,Meta-generalized-gradient exchange-correlation functionals for spin-orbit coupled electrons,"The prominence of density functional theory (DFT) in the field of electronic
+structure computation stems from its ability to usefully balance accuracy and
+computational effort. At the base of this ability is a functional of the
+electron density: the exchange-correlation (xc) energy. This functional
+satisfies known exact conditions that guide the derivation of approximations.
+The strongly-constrained-appropriately-normed (SCAN) approximation stands out
+as a successful, modern, example. In the presence of spin-orbit coupling,
+however, the xc energy must depend not only on the electron density but also on
+spin currents -- a fact which is not captured by SCAN or by any mainstream
+functional approximation. In this work, we demonstrate how the SU(2)
+gauge-invariance of the {\em exact} functional allows us to add the necessary
+dependence on spin currents in the SCAN functional (here called JSCAN) -- and
+similar meta-generalized-gradient functional approximations -- in a
+non-empirical manner. The prescription further ensures that the conjugate
+xc-fields of the spin currents have vanishing local torques as in the exact
+case. In passing, a spin-current dependent generalization of the electron
+localization function (here called JELF) is also derived. The extended forms
+are implemented in a developer's version of the \textsc{Crystal23} program.
+Applications on molecules and materials confirm the practical relevance of the
+extensions.",2401.07581v1
+2013-10-08,Magnetic and Gravitational Disk-Star Interactions: An Interdependence of PMS Stellar Rotation Rates and Spin-Orbit Misalignments,"The presence of giant gaseous planets that reside in close proximity to their
+host stars may be a consequence of large-scale radial migration through the
+proto-planetary nebulae. Within the context of this picture, significant
+orbital obliquities characteristic of a substantial fraction of such planets
+can be attributed to external torques that perturb the disks out of alignment
+with the spin axes of their host stars. Therefore, the acquisition of orbital
+obliquity exhibits sensitive dependence on the physics of disk-star
+interactions. Here, we analyze the primordial excitation of spin-orbit
+misalignment of Sun-like stars, in light of disk-star angular momentum
+transfer. We begin by calculating the stellar pre-main sequence rotational
+evolution, accounting for spin-up due to gravitational contraction and
+accretion as well as spin-down due to magnetic star-disk coupling. We devote
+particular attention to angular momentum transfer by accretion, and show that
+while generally subdominant to gravitational contraction, this process is
+largely controlled by the morphology of the stellar magnetic field (i.e.
+specific angular momentum accreted by stars with octupole-dominated surface
+fields is smaller than that accreted by dipole-dominated stars by an order of
+magnitude). Subsequently, we examine the secular spin-axis dynamics of
+disk-bearing stars, accounting for the time-evolution of stellar and disk
+properties and demonstrate that misalignments are preferentially excited in
+systems where stellar rotation is not overwhelmingly rapid. Moreover, we show
+that the excitation of spin-orbit misalignment occurs impulsively, through an
+encounter with a resonance between the stellar precession frequency and the
+disk-torquing frequency. Cumulatively, the model developed herein opens up a
+previously unexplored avenue towards understanding star-disk evolution and its
+consequences in a unified manner.",1310.2179v1
+2009-04-14,Inverse quantum spin Hall effect generated by spin pumping from precessing magnetization into a graphene-based two-dimensional topological insulator,"We propose a multiterminal nanostructure for electrical probing of the
+quantum spin Hall effect (QSHE) in two-dimensional (2D) topological insulators.
+The device consists of a ferromagnetic (FM) island with precessing
+magnetization that pumps (in the absence of any bias voltage) pure spin current
+symmetrically into the left and right adjacent 2D TIs modeled as graphene
+nanoribbons with the intrinsic spin-orbit (SO) coupling. The QSH regime of the
+six-terminal TI|FM|TI nanodevice, attached to two longitudinal and four
+transverse normal metal electrodes, is characterized by the SO-coupling-induced
+energy gap, chiral spin-filtered edge states within finite length TI regions,
+and quantized spin Hall conductance when longitudinal bias voltage is applied,
+despite the presence of the FM island. The same unbiased device, but with
+precessing magnetization of the central FM island, blocks completely pumping of
+total spin and charge currents into the longitudinal electrodes while
+generating DC transverse charge Hall currents. Although these transverse charge
+currents are not quantized, their induction together with zero longitudinal
+charge current is a unique electrical response of TIs to pumped pure spin
+current that cannot be mimicked by SO-coupled but topologically trivial
+systems. In the corresponding two-terminal inhomogeneous TI|FM|TI
+nanostructures, we image spatial profiles of local spin and charge currents
+within TIs which illustrate transport confined to chiral spin-filtered edges
+states while revealing concomitantly the existence of interfacial spin and
+charge currents flowing around TI|FM interfaces and penetrating into the bulk
+of TIs over some short distance.",0904.2192v3
+2011-05-18,Modulated Rashba interaction in a quantum wire: Spin and charge dynamics,"It was recently shown that a spatially modulated Rashba spin-orbit coupling
+in a quantum wire drives a transition from a metallic to an insulating state
+when the wave number of the modulation becomes commensurate with the Fermi wave
+length of the electrons in the wire. It was suggested that the effect may be
+put to practical use in a future spin transistor design. In the present article
+we revisit the problem and present a detailed analysis of the underlying
+physics. First, we explore how the build-up of charge density wave correlations
+in the quantum wire due to the periodic gate configuration that produces the
+Rashba modulation influences the transition to the insulating state. The
+interplay between the modulations of the charge density and that of the
+spin-orbit coupling turns out to be quite subtle: Depending on the relative
+phase between the two modulations, the joint action of the Rashba interaction
+and charge density wave correlations may either enhance or reduce the Rashba
+current blockade effect. Secondly, we inquire about the role of the Dresselhaus
+spin-orbit coupling that is generically present in a quantum wire embedded in
+semiconductor heterostructure. While the Dresselhaus coupling is found to work
+against the current blockade of the insulating state, the effect is small in
+most materials. Using an effective field theory approach, we also carry out an
+analysis of effects from electron- electron interactions, and show how the
+single-particle gap in the insulating state can be extracted from the more
+easily accessible collective charge and spin excitation thresholds. The
+smallness of the single-particle gap together with the anti-phase relation
+between the Rashba and chemical potential modulations pose serious difficulties
+for realizing a Rashba-controlled current switch in an InAs-based device. Some
+alternative designs are discussed.",1105.4141v2
+2022-04-11,"Spin-orbit coupling controlled ground states in the double perovskite iridates A2BIrO6 (A = Ba, Sr; B = Lu, Sc)","Iridates with the 5$d^4$ electronic configuration have attracted recent
+interest due to reports of magnetically-ordered ground states despite
+longstanding expectations that their strong spin-orbit coupling would generate
+a $J = 0$ electronic ground state for each Ir$^{5+}$ ion. The major focus of
+prior research has been on the double perovskite iridates Ba$_2$YIrO$_6$ and
+Sr$_2$YIrO$_6$, where the nature of the ground states (i.e. ordered vs
+non-magnetic) is still controversial. Here we present neutron powder
+diffraction, high energy resolution fluorescence detected x-ray absorption
+spectroscopy (HERFD-XAS), resonant inelastic x-ray scattering (RIXS), magnetic
+susceptibility, and muon spin relaxation data on the related double perovskite
+iridates Ba$_2$LuIrO$_6$, Sr$_2$LuIrO$_6$, Ba$_2$ScIrO$_6$, and Sr$_2$ScIrO$_6$
+that enable us to gain a general understanding of the electronic and magnetic
+properties for this family of materials. Our HERFD-XAS and RIXS measurements
+establish $J = 0$ electronic ground states for the Ir$^{5+}$ ions in all cases,
+with similar values for Hund's coupling $J_{\rm H}$ and the spin-orbit coupling
+constant $\lambda_{\rm SOC}$. Our bulk susceptibility and muon spin relaxation
+data find no evidence for long-range magnetic order or spin freezing, but they
+do reveal weak magnetic signals that are consistent with extrinsic local
+moments. Our results indicate that the large $\lambda_{\rm SOC}$ is the key
+driving force behind the electronic and magnetic ground states realized in the
+5$d^4$ double perovskite iridates, which agrees well with conventional wisdom.",2204.05384v2
+2016-04-18,"Ferro-deformation at the nuclear system with protons, Z = 20 and neutrons, N = 40: 60Ca","We present a possibility that the system with Z = 20, N = 40, 60Ca, has a
+large deformation, even though it has both proton and neutron magic numbers,
+symbolizing a spherical nucleus. This large deformation corresponds to the
+so-called ferro-deformation that occurs at the particular critical points over
+the nuclear chart. By comparisons with the ferra-deformation at the critical
+point Z = 40, N = 64 [arXiv:1604.02786], we draw a conclusion that shape phase
+transitions should occur at Z = 18 or 20 when N = 36 to 38, which leads to a
+ferro-deformation at the critical points of Z = 18 or 20, N = 40; 58Ar, 60Ca.
+We explain the shape phase transition in terms of isospin dependent
+spin-orbital interactions between neutrons in the f5/2 orbital and protons in
+the f7/2 orbital. We find a universal behavior over the nuclear chart for
+yielding the ferro-deformation such that; Z = 64, N = 104, Z = 40, N = 64, and
+Z = 20, N = 40, respectively. This feature is linked to concept of the
+neutron(n)-proton(p)interaction in spin-orbital couplings such that;
+nh9/2-ph11/2, ng7/2-pg9/2, and nf5/2-pf7/2, respectively. It is suggested that
+triple shape coexistence would be possible in the Z = 20, N = 36, 56Ca, and the
+Z = 18, N = 36, 54Ar, where the ferro-deformation is expected to be built on
+the second 0+ state. The predicted level schemes for 52Ar, 54Ar, 56Ar, 56Ca,
+58Ca, and 60Ca are presented.",1604.05013v1
+2014-03-03,Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas,"Two-dimensional electron gases (2DEGs) in SrTiO$_3$ have become model systems
+for engineering emergent behaviour in complex transition metal oxides.
+Understanding the collective interactions that enable this, however, has thus
+far proved elusive. Here we demonstrate that angle-resolved photoemission can
+directly image the quasiparticle dynamics of the $d$-electron subband ladder of
+this complex-oxide 2DEG. Combined with realistic tight-binding supercell
+calculations, we uncover how quantum confinement and inversion symmetry
+breaking collectively tune the delicate interplay of charge, spin, orbital, and
+lattice degrees of freedom in this system. We reveal how they lead to
+pronounced orbital ordering, mediate an orbitally-enhanced Rashba splitting
+with complex subband-dependent spin-orbital textures and markedly change the
+character of electron-phonon coupling, co-operatively shaping the low-energy
+electronic structure of the 2DEG. Our results allow for a unified understanding
+of spectroscopic and transport measurements across different classes of
+SrTiO$_3$-based 2DEGs, and yield new microscopic insights on their functional
+properties.",1403.0520v2
+1999-06-08,Orbital symmetry of a triplet pairing in a heavy Fermion superconductor UPt_3,"The orbital symmetry of the superconducting order parameter in UPt_3 is
+identified by evaluating the directionally dependent thermalconductivity and
+ultrasound attenuation in the clean limit and compared with the existing data
+for both basal plane and the c-axis of a hexagonal crystal. The resulting two
+component orbital part expressed by (\lambda_x(k), \lambda_y(k)) is combined
+with the previously determined triplet spin part, leading to clean limit and
+compared with the existing data for both basal plane and the c-axis of a
+hexagonal crystal. The resulting two component orbital part expressed by
+(\lambda_x(k), \lambda_y(k)) is combined with the previously determined triplet
+spin part, leading to the order parameter of either the non-unitary bipolar
+state of the form: d(k) = b \lambda_x(k) + i j \lambda_y(k) or the unitary
+planar state of the form: d(k) = b \lambda_x(k) + j \lambda_y(k) where b \perp
+j = c, or a with the hexagonal unit vectors a, b and c. The d vector is
+rotatable in the plane spanned by a and c perpendicular to b under weak applied
+c-axis field because of the weak spin orbit coupling. Experiments are proposed
+to distinguish between the equally possible these states.",9906105v1
+2022-03-11,Variable and orbital-dependent spin-orbit field orientations in a InSb double quantum dot characterized via dispersive gate sensing,"Utilizing dispersive gate sensing (DGS), we investigate the spin-orbit field
+($\textbf{B}_{SO}$) orientation in a many-electron double quantum dot (DQD)
+defined in an InSb nanowire. While characterizing the inter-dot tunnel
+couplings, the measured dispersive signal depends on the electron charge
+occupancy, as well as on the amplitude and orientation of the external magnetic
+field. The dispersive signal is mostly insensitive to the external field
+orientation when a DQD is occupied by a total odd number of electrons. For a
+DQD occupied by a total even number of electrons, the dispersive signal is
+reduced when the finite external magnetic field aligns with the effective
+$\textbf{B}_{SO}$ orientation. This fact enables the identification of
+$\textbf{B}_{SO}$ orientations for different DQD electron occupancies. The
+$\textbf{B}_{SO}$ orientation varies drastically between charge transitions,
+and is generally neither perpendicular to the nanowire nor in the chip plane.
+Moreover, $\textbf{B}_{SO}$ is similar for pairs of transitions involving the
+same valence orbital, and varies between such pairs. Our work demonstrates the
+practicality of DGS in characterizing spin-orbit interactions in quantum dot
+systems, without requiring any current flow through the device.",2203.06047v2
+2023-12-28,Coupling of structure and magnetism to spin splitting in hybrid organic-inorganic perovskites,"Hybrid organic-inorganic perovskites are famous for the diversity of their
+chemical compositions, phases and phase transitions, and associated physical
+properties. We use a combination of experimental and computational techniques
+to reveal strong coupling between structure, magnetism, and spin splitting in a
+representative of the largest family of hybrid organic-inorganic perovskites:
+the formates. With the help of first-principles simulations, we find spin
+splitting in both conduction and valence bands of [NH$_2$NH$_3$]Co(HCOO)$_3$,
+induced by spin-orbit interactions, which can reach up to 14~meV. Our magnetic
+measurements reveal that this material exhibits canted antiferromagnetism below
+15.5 K. The direction of the associated antiferromagnetic order parameter is
+strongly coupled with the spin splitting already in the centrosymmetric phase,
+allowing for the creation and annihilation of spin splitting through the
+application of a magnetic field. Furthermore, the structural phase transition
+into experimentally observed polar Pna2$_1$ phase completely changes the
+aforementioned spin splitting and its coupling to magnetic degrees of freedom.
+This reveals that in [NH$_2$NH$_3$]Co(HCOO)$_3$, the structure and magnetism
+are strongly coupled to spin splitting in a way that allows for its
+manipulation through both magnetic and electric fields. As an example, for a
+given point inside the Brillouin zone of centrosymmetric Pnma phase of
+[NH$_2$NH$_3$]Co(HCOO)$_3$, spin splitting can be turned on/off by aligning the
+antiferromagnetic vector along certain crystallographic directions or through
+inducing a polar phase by the application of an electric field. We believe that
+our findings offer an important step toward fundamental understanding and
+practical applications of materials with coupled properties.",2312.17352v1
+2012-08-02,Unified theory of spin-dynamics in a two dimensional electron gases with arbitrary spin-orbit coping strength at finite temperature,"We study the spin dynamics in the presence of impurity and electron-electron
+(e-e) scattering in a III-V semiconductor quantum well with arbitrary
+spin-orbit coupling (SOC) strength and symmetry at finite temperature. We
+derive the coupled spin-charge dynamic equations in the presence of inelastic
+scattering and provide a new formalism that describes the spin relaxation and
+dynamics in both the weak and the strong SOC regime in a unified way. In the
+weak SOC regime, as expected, our theory reproduces all previous
+zero-temperature results, most of which have focused on impurity-scattering
+induced spin-charge dynamics. In the regime where the strength of the Rashba
+and linear Dresselhaus SOC match, known as the SU(2) symmetry point,
+experiments have observed the spin-helix mode with a large spin-lifetime whose
+unexplained non-monotonic temperature dependence peaks at around 75 K. As a key
+test of our theory, we are able to naturally explain quantitatively this
+non-monotonic dependence and show that it arises as a competition between the
+Dyakonov-Perel mechanism, suppressed at the SU(2) point, and the Elliott-Yafet
+mechanism. In the strong SOC regime, we show that our theory directly
+reproduces the only previous known analytical result at the SU(2) symmetry
+point in the ballistic regime. It also explains, as we have shown previously,
+the rise of damped oscillating dynamics when the electron scattering time is
+larger than half of the spin precession time due to the SOC. Hence, we provide
+a unified theory of the spin-dynamics in two dimensional electron gases in the
+full phase diagram experimentally accessible.",1208.0379v2
+2013-02-24,Electron spin relaxation in bilayer graphene,"Electron spin relaxation due to the D'yakonov-Perel' mechanism is
+investigated in bilayer graphene with only the lowest conduction band being
+relevant. The spin-orbit coupling is constructed from the symmetry group
+analysis with the parameters obtained by fitting to the numerical calculation
+according to the latest report by Konschuh {\it et al.} [Phys. Rev. B {\bf 85},
+115423 (2012)] from first principles. In contrast to single-layer graphene, the
+leading term of the out-of-plane component of the spin-orbit coupling in
+bilayer graphene shows a Zeeman-like term with opposite effective magnetic
+fields in the two valleys. This Zeeman-like term opens a spin relaxation
+channel in the presence of intervalley scattering. It is shown that the
+intervalley electron-phonon scattering, which has not been reported in the
+previous literature, strongly suppresses the in-plane spin relaxation time at
+high temperature whereas the intervalley short-range scattering plays an
+important role in the in-plane spin relaxation especially at low temperature. A
+marked nonmonotonic dependence of the in-plane spin relaxation time on
+temperature with a minimum of several hundred picoseconds is predicted in the
+absence of the short-range scatterers. This minimum is comparable to the
+experimental data. Moreover, a peak in the electron density dependence of the
+in-plane spin relaxation time at low temperature, which is very different from
+the one in semiconductors, is predicted. We also find a rapid decrease in the
+in-plane spin relaxation time with increasing initial spin polarization at low
+temperature, which is opposite to the situation in both semiconductors and
+single-layer graphene. ......(The remaining is cut due to the limit of space)",1302.5880v2
+2008-07-04,Intersubband-induced spin-orbit interaction in quantum wells,"Recently, we have found an additional spin-orbit (SO) interaction in quantum
+wells with two subbands [Phys. Rev. Lett. 99, 076603 (2007)]. This new SO term
+is non-zero even in symmetric geometries, as it arises from the intersubband
+coupling between confined states of distinct parities, and its strength is
+comparable to that of the ordinary Rashba. Starting from the $8 \times 8$ Kane
+model, here we present a detailed derivation of this new SO Hamiltonian and the
+corresponding SO coupling. In addition, within the self-consistent Hartree
+approximation, we calculate the strength of this new SO coupling for realistic
+symmetric modulation-doped wells with two subbands. We consider gated
+structures with either a constant areal electron density or a constant chemical
+potential. In the parameter range studied, both models give similar results. By
+considering the effects of an external applied bias, which breaks the
+structural inversion symmetry of the wells, we also calculate the strength of
+the resulting induced Rashba couplings within each subband. Interestingly, we
+find that for double wells the Rashba couplings for the first and second
+subbands interchange signs abruptly across the zero bias, while the
+intersubband SO coupling exhibits a resonant behavior near this symmetric
+configuration. For completeness we also determine the strength of the
+Dresselhaus couplings and find them essentially constant as function of the
+applied bias.",0807.0771v2
+2021-06-15,Cavity magnon-polaritons in cuprate parent compounds,"Cavity control of quantum matter may offer new ways to study and manipulate
+many-body systems. A particularly appealing idea is to use cavities to enhance
+superconductivity, especially in unconventional or high-$T_c$ systems.
+Motivated by this, we propose a scheme for coupling Terahertz resonators to the
+antiferromagnetic fluctuations in a cuprate parent compound, which are believed
+to provide the glue for Cooper pairs in the superconducting phase. First, we
+derive the interaction between magnon excitations of the Ne\'el-order and polar
+phonons associated with the planar oxygens. This mode also couples to the
+cavity electric field, and in the presence of spin-orbit interactions mediates
+a linear coupling between the cavity and magnons, forming hybridized
+magnon-polaritons. This hybridization vanishes linearly with photon momentum,
+implying the need for near-field optical methods, which we analyze within a
+simple model. We then derive a higher-order coupling between the cavity and
+magnons which is only present in bilayer systems, but does not rely on
+spin-orbit coupling. This interaction is found to be large, but only couples to
+the bimagnon operator. As a result we find a strong, but heavily damped,
+bimagnon-cavity interaction which produces highly asymmetric cavity line-shapes
+in the strong-coupling regime. To conclude, we outline several interesting
+extensions of our theory, including applications to carrier-doped cuprates and
+other strongly-correlated systems with Terahertz-scale magnetic excitations.",2106.07828v1
+2018-06-14,Spin-orbit coupling and topological phases for ultracold atoms,"Cold atoms with laser-induced spin-orbit (SO) interactions provide promising
+platforms to explore novel quantum physics, in particular the exotic
+topological phases, beyond natural conditions of solids. The past several years
+have witnessed important progresses in both theory and experiment in the study
+of SO coupling and novel quantum states for ultracold atoms. Here we review the
+physics of the SO coupled quantum gases, focusing on the latest theoretical and
+experimental progresses of realizing SO couplings beyond one-dimension (1D),
+and the further investigation of novel topological quantum phases in such
+systems, including the topological insulating phases and topological
+superfluids. A pedagogical introduction to the SO coupling for ultracold atoms
+and topological quantum phases is presented. We show that the so-called optical
+Raman lattice schemes, which combine the creation of the conventional optical
+lattice and Raman lattice with topological stability, can provide minimal
+methods with high experimental feasibility to realize 1D to 3D SO couplings.
+The optical Raman lattices exhibit novel intrinsic symmetries, which enable the
+natural realization of topological phases belonging to different symmetry
+classes, with the topology being detectable through minimal measurement
+strategies. We introduce how the non-Abelian Majorana modes emerge in the SO
+coupled superfluid phases which can be topologically nontrivial or trivial, for
+which a few fundamental theorems are presented and discussed. The experimental
+schemes for achieving non-Abelian superfluid phases are given. Finally, we
+point out the future important issues in this rapidly growing research field.",1806.05628v1
+2020-05-17,Nonlinear modes in spatially confined spin-orbit-coupled Bose-Einstein condensates with repulsive nonlinearity,"It was found that spatially confined spin-orbit (SO) coupling, which can be
+induced by illuminating Bose-Einstein condensates (BECs) with a Gaussian laser
+beam, can help trap a spinor Bose gas in multi-dimensional space. Previous
+works on this topic were all based on a Boson gas featuring an attractive
+interaction. In this paper, we consider the trapping effect in the case in
+which the Boson gas features a repulsive interaction. After replacing the
+repulsive effect, stable excited modes of semi-vortex (SV) type and mixed-mode
+(MM) type, which cannot be created in a boson gas with attractive interactions,
+can be found in the current setting. The trapping ability and the capacity of
+the confined SO coupling versus the degree of the repulsive strength as well as
+the order of the excited mode are systematically discussed firstly through the
+paper. Moreover, the stability of the nonlinear mode trapped in this system
+with a moving reference frame is also discussed. Unlike the system with
+homogeneous SO coupling, two different types of stationary mobility modes can
+be stabilized when the SO coupling moves in the x- and y- directions,
+respectively. This finding indicates that the system with moving confined SO
+coupling features a typical anisotropic character that differs from the system
+with moving homogeneous SO coupling.",2005.08268v1
+2018-03-20,Anisotropic Pauli spin-blockade effect and spin-orbit interaction field in an InAs nanowire double quantum dot,"We report on experimental detection of the spin-orbit interaction field in an
+InAs nanowire double quantum dot device. In the spin blockade regime, leakage
+current through the double quantum dot is measured and is used to extract the
+effects of spin-orbit interaction and hyperfine interaction on spin state
+mixing. At finite magnetic fields, the leakage current arising from the
+hyperfine interaction is suppressed and the spin-orbit interaction dominates
+spin state mixing. We observe dependence of the leakage current on the applied
+magnetic field direction and determine the direction of the spin-orbit
+interaction field. We show that the spin-orbit field lies in a direction
+perpendicular to the nanowire axis but with a pronounced off-substrate-plane
+angle. It is for the first time that such an off-substrate-plane spin-orbit
+field in an InAs nanowire has been detected. The results are expected to have
+an important implication in employing InAs nanowires to construct spin-orbit
+qubits and topological quantum devices.",1803.07277v1
+2008-01-31,Zero-field spin-splitting and spin lifetime in n-InSb/In1-xAlxSb asymmetric quantum well heterostructures,"The spin-orbit (SO) coupling parameters for lowest conduction subband due to
+structural (SIA) and bulk (BIA) inversion asymmetry are calculated for a range
+of carrier densities in [001]-grown delta-doped n-type InSb/In1-xAlxSb
+asymmetric quantum wells using the established 8 band k.p formalism [PRB 59,8
+R5312 (1999)]. We present calculations for conditions of zero bias at 10 K. It
+is shown that both the SIA and BIA parameters scale approximately linearly with
+carrier density, and exhibit a marked dependence on well width when alloy
+composition is adjusted to allow maximum upper barrier height for a given well
+width. In contrast to other material systems the BIA contribution to spin
+splitting is found to be of significant and comparable value to the SIA
+mechanism in these structures. We calculate the spin lifetime for spins
+oriented along [11-0] based on D'yakonov-Perel mechanism using both the theory
+of Averkiev et al. [J. Phys.:Condens. Matter 14 (2002)] and also the rate of
+precession of spins about the effective magnetic field, taking into account all
+three SO couplings, showing good agreement.Spin lifeime for this direction is
+largest in the narrow wells over the range of moderate carrier densities
+considered, which is attributed to the reduced magnitude of the k-cubic BIA
+parameter in narrow wells. The inherently large BIA induced SO coupling in
+these systems is shown to have considerable effect on the spin lifetime, which
+exhibits significant reduction in the maximum spin lifetime compared to
+previous studies which consider systems with relatively weak BIA induced SO
+coupling. The relaxation rate of spins oriented in the [001] direction is
+dominated by the k-linear SIA and BIA coupling parameters and at least an order
+of magnitude greater than in the [11-0] direction.",0801.4849v2
+2020-10-21,Spin-orbit coupling effects on spin-phonon coupling in Cd2Os2O7,"Spin-orbit coupling (SOC) is essential in understanding the properties of 5d
+transition metal compounds, whose SOC value is large and almost comparable to
+other key parameters. Over the past few years, there have been numerous studies
+on the SOC-driven effects of the electronic bands, magnetism, and spin-orbit
+entanglement for those materials with a large SOC. However, it is less studied
+and remains an unsolved problem in how the SOC affects the lattice dynamics.
+We, therefore, measured the phonon spectra of 5d pyrochlore Cd2Os2O7 over the
+full Brillouin zone to address the question by using inelastic x-ray scattering
+(IXS). Our main finding is a visible mode-dependence in the phonon spectra,
+measured across the metal-insulator transition at 227 K. We examined the SOC
+strength dependence of the lattice dynamics and its spin-phonon (SP) coupling,
+with first-principle calculations. Our experimental data taken at 100 K are in
+good agreement with the theoretical results obtained with the optimized U = 2.0
+eV with SOC. By scaling the SOC strength and the U value in the DFT
+calculations, we demonstrate that SOC is more relevant than U to explaining the
+observed mode-dependent phonon energy shifts with temperature. Furthermore, the
+temperature dependence of the phonon energy can be effectively described by
+scaling SOC. Our work provides clear evidence of SOC producing a non-negligible
+and essential effect on the lattice dynamics of Cd2Os2O7 and its SP coupling.",2010.10684v1
+2023-04-11,Excitation and voltage-gated modulation of single-mode dynamics in a planar nano-gap spin Hall nano-oscillator,"We experimentally study the dynamical modes excited by current-induced
+spin-orbit torque and its electrostatic gating effect in a 3-terminal planar
+nano-gap spin Hall nano-oscillator (SHNO) with a moderate interfacial
+perpendicular magnetic anisotropy (IPMA). Both quasilinear propagating
+spin-wave and localized ""bullet"" modes are achieved and controlled by varying
+the applied in-plane magnetic field and driving current. The minimum linewidth
+shows a linear dependence on the actual temperature of the active area,
+confirming single-mode dynamics based on the nonlinear theory of spin-torque
+nano-oscillation with a single mode. The observed electrostatic gating tuning
+oscillation frequency arises from voltage-controlled magnetic anisotropy and
+threshold current of SHNO via modification of the nonlinear damping and/or the
+interfacial spin-orbit coupling of the magnetic multilayer. In contrast to
+previously observed two-mode coexistence degrading the spectral purity in
+Py/Pt-based SHNOs with a negligible IPMA, a single coherent spin-wave mode with
+a low driven current can be achieved by selecting the ferromagnet layer with a
+suitable IPMA because the nonlinear mode coupling can be diminished by bringing
+in the PMA field to compensate the easy-plane shape anisotropy. Moreover, the
+simulations demonstrate that the experimentally observed current and
+gate-voltage modulation of auto-oscillation modes are also closely associated
+with the nonlinear damping and mode coupling, which are determined by the
+ellipticity of magnetization precession. The demonstrated nonlinear mode
+coupling mechanism and electrical control approach of spin-wave modes could
+provide the clue to facilitate the implementation of the mutual synchronization
+map for neuromorphic computing applications in SHNO array networks.",2304.05026v1
+2016-06-08,Effect of ferromagnetic exchange field on band-gap and spin-polarization of graphene on a TMD substrate,"We calculate the electronic band dispersion of graphene monolayer on a two
+dimensional transition metal dichalcogenide substrate (GTMD) (viz., XY2 , X =
+Mo, W; Y = S, Se) around K and K prime points taking into account the interplay
+of the exchange field due to the ferromagnetic impurities and the substrate
+induced, sub-lattice-resolved, strongly enhanced intrinsic spin-orbit
+couplings(SOC). There are extrinsic Rashba spin-orbit coupling(RSOC) and the
+orbital gap related to the transfer of the electronic charge from graphene to
+XY2 as well. The former allows for external tuning of the band gap in GTMD and
+connects the nearest neighbors with spin-flip. On account of the strong SOC,
+the system acts as a quantum spin Hall insulator. We introduce the exchange
+field (M) in the Hamiltonian to take into account the deposition of Fe atoms on
+the graphene surface. The cavalcade of the perturbations yield particle-hole
+symmetric bands with an effective Zeeman field due to the interplay of the
+substrate induced interactions with RSOC as the prime player. Our graphical
+analysis with extremely low-lying states strongly suggests the following: The
+GTMDs like WY2 exhibit band gap narrowing/widening (Moss-Burs-tein(MB)gap
+shift)including the spin-polarization inversion(SPI) at finite but low
+temperature (T = 1 K) due to the increase in the exchange field (M) at the
+Dirac point K. For graphene on MoY2, on the other hand, the occurrence of the
+MB-shift and the SPI at higher temperature (T = 10 K) take place as M is
+increased at the Dirac point K prime. Finally, there is anti-crossing of
+non-parabolic bands with opposite spins around Dirac points. A direct electric
+field control of magnetism at the nano-scale is needed here. The magnetic
+multi-ferroics, like BiFeO3 (BFO), are useful for this purpose due to the
+coupling between the magnetic and electric order parameters.",1606.02413v2
+2021-04-16,"Interplay of spin magnetism, orbital magnetism, and atomic structure in layered van der Waals ferromagnet VI$_3$","Recently discovered ferromagnetism of the layered van der Waals material
+VI$_3$ attracts much research attention. Despite substantial progress,in the
+following important aspects no consensus has been reached: (i) a possible
+deviation of the easy axis from the normal to the VI$_3$ layers, (ii) a
+possible inequivalence of the V atoms, (iii) the value of the V magnetic
+moments. The theoretical works differ in the conclusions on the conduction
+nature of the system,the value and the role of the V orbital moments. To the
+best of our knowledge there is no theoretical works addressing issues (i) and
+(ii) and only one work dealing with the reduced value of the V moment. By
+combining the symmetry arguments with density functional theory (DFT) and
+DFT+$U$ calculations we have shown that the antidimerization distortion of the
+crystal structure reported in Phys. Rev. B {\bf 99}, 041402(R) (2019) must lead
+to the deviation of the easy axis from the normal to the VI$_3$ layers in close
+correlation with the experimental results. The antidimerization accompanied by
+the breaking the inversion symmetry leads to the inequivalence of the V atoms.
+Our DFT+U calculations result in large value 0.8\mu_B$ of the V orbital moments
+of the V atoms leading to reduced total V moment in agreement with a number of
+experimental results and with the physical picture suggested in Phys. Rev. B bf
+101, 100402(R) (2020). We obtained large intraatomic noncollinearity of the V
+spin and orbital moments revealing strong competition between effects coursed
+by the on-site electron correlation, spin-orbit coupling, and interatomic
+hybridization since pure intraatomic effects lead to collinear spin and orbital
+moments. Our calculations confirm the experimental results of strong
+magnetoelastic coupling revealing itself in the strong dependence of the
+magnetic properties on the distortion of the atomic structure.",2104.07992v1
+2009-03-05,"Particle Classification and Dynamics in GL(2,C) Gravity","A relatively simple approach to noncommutative gravity utilizes the gauge
+theory formulation of general relativity and involves replacing the Lorentz
+gauge group by a larger group. This results in additional field degrees of
+freedom which either must be constrained to vanish in a nontrivial way, or
+require physical interpretation. With the latter in mind, we examine the
+coupling of the additional fields to point particles. Nonstandard particle
+degrees of freedom should be introduced in order to write down the most general
+coupling. The example we study is the $GL(2,C)$ central extension of gravity
+given by Chamseddine, which contains two U(1) gauge fields, and a complex
+vierbein matrix, along with the usual spin connections. For the general
+coupling one should then attach two U(1) charges and a complex momentum vector
+to the particle, along with the spin. The momenta span orbits in a
+four-dimensional complex vector space, and are classified by $GL(2,C)$
+invariants and by their little groups. In addition to orbits associated with
+standard massive and massless particles, a number of novel orbits can be
+identified. We write down a general action principle for particles associated
+with any nontrivial orbit and show that it leads to corrections to geodesic
+motion. We also examine the classical and quantum theory of the particle in
+flat space-time.",0903.0882v2
+2013-04-05,Anisotropic Magneto Resistance and Planar Hall Effect at the LaAlO$_3$/SrTiO$_3$ Heterointerfaces: Effect of Carrier Confinement on Magnetic Interactions,"The confinement of the two dimensional electron gas (2DEG), preferential
+occupancy of the Ti 3d orbital and strong spin-orbit coupling at the
+LaAlO$_3$/SrTiO$_3$ interface play a significant role in its emerging
+properties. Here we report a fourfold oscillation in the anisotropic magneto
+resistance (AMR) and the observation of planar Hall effect (PHE) at the
+LaAlO$_3$/SrTiO$_3$ heterointerface. We evaluate the carrier confinement
+effects on the AMR and find that the fourfold oscillation appears only for the
+case of 2DEG system while it is twofold for the 3D system. As the fourfold
+oscillation fits well to the phenomenological model for a cubic symmetry
+system, we attribute this oscillation to the anisotropy in the magnetic
+scattering arising from the interaction of electrons with the localized
+magnetic moments coupled to the crystal symmetry. The AMR behavior is further
+found to be sensitive to applied gate electric field, emphasizing the
+significance of spin-orbit coupling at the interface. These confinement effects
+suggest that the magnetic interactions are predominant at the interface, and
+the gate electric field modulation of AMR suggest the possible gate tunable
+magnetic interactions in these systems. The observed large PHE further
+indicates that the in plane nature of magnetic ordering arises from the
+in-plane Ti 3dxy orbitals.",1304.1619v1
+2014-09-28,Generalized Hund's rule for two-atom systems,"Hund's rule is one of the fundamentals of the correlation physics at the
+atomic level, determining the ground state multiplet of the electrons. It
+consists of three laws: (i) maximum $S$ (total spin), (ii) maximum $L$ (total
+orbital angular momentum) under the constraint of (i), and (iii) the total
+angular momentum $J$ is $|L-S|$ for electron number less than half, while
+$J=L+S$ for more than half due to the relativistic spin-orbit interaction
+(SOI). In real systems, the electrons hop between the atoms and gain the
+itinerancy, which is usually described by the band theory. The whole content of
+theories on correlation is to provide a reliable way to describe the
+intermediate situation between the two limits. Here we propose an approach
+toward this goal, i.e., we study the two-atom systems of three $t_{2g}$
+orbitals and see how the Hund's rule is modified by the transfer integral $t$
+between them. It is found that the competition between $t$ and the Hund's
+coupling $J$ at each atom determines the crossover from the molecular orbital
+limit to the strong correlation limit. Especially, the focus is on the
+generalization of the third rule, i.e., the inter-and intra-atomic SOI's in the
+presence of the correlation. We have found that there are cases where the
+effective SOI's are appreciably enhanced by the Hund's coupling. The conditions
+for the enhancement are the intermediate Hund's coupling and the filling of
+four or five electrons.",1409.7858v1
+2003-10-01,Spin and orbital structure of uranium compounds on the basis of a j-j coupling scheme,"Key role of orbital degree of freedom to understand the magnetic structure of
+uranium compounds is discussed from a microscopic viewpoint by focusing on
+typical examples such as UMGa$_5$ (M=Ni and Pt) and the mother compound
+UGa$_3$. By analyzing an orbital degenerate Hubbard model constructed from the
+$j$-$j$ coupling scheme in the cubic system, we obtain the phase diagram
+including several kinds of magnetic states. Especially, in the parameter region
+corresponding to actual uranium compounds, the phase diagram suggests
+successive transitions among paramagnetic, magnetic metallic, and insulating
+N\'eel states, consistent with the experimental results for AuCu$_3$-type
+uranium compounds. Furthermore, taking account of tetragonal effects such as
+level splitting and reduction of hopping amplitude along the z-axis, an
+orbital-based scenario is proposed to understand the change in the magnetic
+structure from G- to A-type antiferromagnetic phases, experimentally observed
+in UNiGa$_5$ and UPtGa$_5$.",0310008v2
+2009-08-27,Magnetic groundstates in a correlated two orbital Hubbard model,"We examine the orbital and magnetic order of the two orbital Hubbard model
+within dynamical mean field theory. The model describes the low energy physics
+of a partially filled $e_g$-band as can be found in some transition metal
+compounds. The model shows antiferromagnetic as well as ferromagnetic phases.
+For stabilizing ferromagnetism we find that Hund's coupling is particularly
+important. Quarter filling represents a very special situation in the phase
+diagram, where the coupling of spin, charge, and orbital degrees of freedom are
+involved. Exactly at quarter filling we find a metal insulator transition (MIT)
+between two almost fully polarized ferromagnetic states. This MIT can be tuned
+by changing the local interaction strength and seems to be a first order
+transition at zero temperature. Apart from these ferromagnetic states we were
+also able to stabilize antiferromagnetic and charge ordered phases at quarter
+filling, depending on the interaction parameters.",0908.3990v2
+2019-09-18,Efficient Formulation of Ab Initio Quantum Embedding in Periodic Systems: Dynamical Mean-Field Theory,"We present an efficient ab initio dynamical mean-field theory (DMFT)
+implementation for quantitative simulations in solids. Our DMFT scheme employs
+ab initio Hamiltonians defined for impurities comprising the full unit cell or
+a supercell of atoms and for realistic quantum chemical basis sets. We avoid
+double counting errors by using Hartree-Fock as the low-level theory. Intrinsic
+and projected atomic orbitals (IAO+PAO) are chosen as the local embedding
+basis, facilitating numerical bath truncation. Using an efficient integral
+transformation and coupled-cluster Green's function (CCGF) impurity solvers, we
+are able to handle embedded impurity problems with several hundred orbitals. We
+apply our ab initio DMFT approach to study a hexagonal boron nitride monolayer,
+crystalline silicon, and nickel oxide in the antiferromagnetic phase, with up
+to 104 and 78 impurity orbitals in spin-restricted and unrestricted cluster
+DMFT calculations and over 100 bath orbitals. We show that our scheme produces
+accurate spectral functions compared to both benchmark periodic coupled-cluster
+computations and experimental spectra.",1909.08592v2
+2021-02-07,Berry curvature induced magnetotransport in 3D noncentrosymmetric metals,"We study the magnetoelectric and magnetothermal transport properties of
+noncentrosymmetric metals using semiclassical Boltzmann transport formalism by
+incorporating the effects of Berry curvature and orbital magnetic moment. These
+effects impart quadratic-B dependence to the magnetoelectric and magnetothermal
+conductivities, leading to intriguing phenomena such as planar Hall effect,
+negative magnetoresistance, planar Nernst effect and negative Seebeck effect.
+The transport coefficients associated with these effects show the usual
+oscillatory behavior with respect to the angle between the applied electric
+field and magnetic field. The bands of noncentrosymmetric metals are split by
+Rashba spin-orbit coupling except at a band touching point. For Fermi energy
+below (above) the band touching point, giant (diminished) negative
+magnetoresistance is observed. This difference in the nature of
+magnetoresistance is related to the magnitudes of the velocities, Berry
+curvature and orbital magnetic moment on the respective Fermi surfaces, where
+the orbital magnetic moment plays the dominant role. The absolute
+magnetoresistance and planar Hall conductivity show a decreasing (increasing)
+trend with Rashba coupling parameter for Fermi energy below (above) the band
+touching point.",2102.03779v2
+2022-04-23,Stability analysis of circular orbits around a traversable wormhole with massless conformally coupled scalar field,"We study the stability of circular orbits in the background of a traversable
+wormhole (TWH) spacetime obtained as a solution of Einstein's field equations
+coupled conformally to a massless scalar field. The Lyapunov stability approach
+is employed to determine the stability of circular orbits (timelike and null)
+of non-spinning test particles around a TWH spacetime. In the case of timelike
+geodesics, the particle is confined to move in four different types of
+effective potentials depending on various values of the angular momentum L with
+both centrifugal and gravitational part. The effective potential for null
+geodesics consists of only a centrifugal part. Further, we characterize each
+fixed point according to its Lyapunov stability, and thus classify the circular
+orbits at the fixed point into stable center and unstable saddle points by
+depicting the corresponding phase-portraits.",2204.10988v1
+2023-01-03,Angular Momentum for Black Hole Binaries in Numerical Relativity,"The extensive catalog of waveforms, with details of binary black hole
+inspiral and merger, offer an opportunity to understand black hole interactions
+beyond the large separation regime. We envision a research program that focuses
+on the transfer of angular momentum from spin of the individual holes to the
+orbital angular momentum and the role of tidal coupling in the process. That
+analysis will require the formulation of an expression for the orbital angular
+momentum of a binary, an expression that is useful at small separations, since
+that regime is well out of the range of Newtonian approximations and is where
+tidal coupling should be most interesting. We report here such an expression, a
+binary orbital angular momentum based on numerical relativity results for
+quasi-circular orbits, that agrees remarkably well with a similar quantity
+constructed with particle-perturbation techniques for the Kerr geometry.",2301.01185v2
+1998-12-07,Resonant Tidal Excitations of Rotating Neutron Stars in Coalescing Binaries,"In a coalescing neutron star-neutron star (NS-NS) or neutron star-black hole
+(NS-BH) binary, oscillation modes of the NS can be resonantly excited by the
+companion during the final minutes of the inspiral. The resonant energy
+transfer between the orbit and NS speeds up or slows down the inspiral and
+induces a phase change in the emitted gravitational waves from the binary. A
+tidal resonance, (jk,m), occurs when the mode frequency equals m times the
+orbital frequency. For f-mode resonance to occur before coalescence, the NS
+must have rapid rotation, with spin frequency nu_s>710Hz for (22,2)-resonance
+and nu_s>570Hz for (33,3)-resonance (M=1.4Mo and R=10km; however, for R=15km,
+these spin frequencies become 330Hz and 250Hz). Because of strong tidal
+coupling, f-mode resonances induce a large change in the number of orbital
+cycles, N_orb, with maximum N_orb~10-1000 for (22,2)-resonance and N_orb~1 for
+(33,3)- resonance. Such resonant effects, if present, must be included in
+constructing waveform templates used in searching for gravitational wave
+signals. Higher order f-mode resonances can occur at slower rotation rates, but
+N_orb<0.1. For the dominant g-mode (22,2)-resonance, even modest rotation
+(nu_s<100Hz) can enhance the resonant effect on the orbit by shifting resonance
+to a smaller orbital frequency. However, because of the weak coupling, N_orb
+lies in the range 10^-3-10^-2 (depending on the NS EOS) and is probably
+negligible for the purpose of detecting gravitational waves. R-mode resonances
+require misaligned spin-orbit inclinations, and the dominant resonances
+correspond to (22,3) and (22,1). Since tidal coupling depends strongly on
+rotation rate, N_orb<10^-2(R/10km)^(10)(M/1.4Mo)^(-20/3) is negligible for
+canonical NS parameters but can be appreciable if the NS radius is larger.",9812116v2
+2010-04-28,Scalable quantum register based on coupled electron spins in a room temperature solid,"Realization of devices based on quantum laws might lead to building
+processors that outperform their classical analogues and establishing
+unconditionally secure communication protocols. Solids do usually present a
+serious challenge to quantum coherence. However, owing to their spin-free
+lattice and low spin orbit coupling, carbon materials and particularly diamond
+are suitable for hosting robust solid state quantum registers. We show that
+scalable quantum logic elements can be realized by exploring long range
+magnetic dipolar coupling between individually addressable single electron
+spins associated with separate color centers in diamond. Strong distance
+dependence of coupling was used to characterize the separation of single qubits
+98 A with unprecedented accuracy (3 A) close to a crystal lattice spacing. Our
+demonstration of coherent control over both electron spins, conditional
+dynamics, selective readout as well as switchable interaction, opens the way
+towards a room temperature solid state scalable quantum register. Since both
+electron spins are optically addressable, this solid state quantum device
+operating at ambient conditions provides a degree of control that is currently
+available only for atomic systems.",1004.5090v1
+2018-04-11,Maximum spin polarization in chromium dimer cations as demonstrated by x-ray magnetic circular dichroism spectroscopy,"X-ray magnetic circular dichroism spectroscopy has been used to characterize
+the electronic structure and magnetic moment of Cr$_2^+$. Our results indicate
+that the removal of a single electron from the $4s\sigma_g$ bonding orbital of
+Cr$_2$ drastically changes the preferred coupling of the $3d$ electronic spins.
+While the neutral molecule has a zero-spin ground state with a very short bond
+length, the molecular cation exhibits a ferromagnetically coupled ground state
+with the highest possible spin of $S=11/2$, and almost twice the bond length of
+the neutral molecule. This spin configuration can be interpreted as a result of
+indirect exchange coupling between the $3d$ electrons of the two atoms that is
+mediated by the single $4s$ electron through a strong intraatomic $3d$-$4s$
+exchange interaction. Our finding allows an estimate of the relative energies
+of two states that are often discussed as ground-state candidates, the
+ferromagnetically coupled $^{12}\Sigma$ and the low-spin $^2\Sigma$ state.",1804.03866v1
+2020-09-12,Long-range exchange interaction between spin qubits mediated by a superconducting link at finite magnetic field,"Solid state spin qubits are promising candidates for the realization of a
+quantum computer due to their long coherence times and easy electrical
+manipulation. However, spin-spin interactions, which are needed for entangling
+gates, have only limited range as they generally rely on tunneling between
+neighboring quantum dots. This severely constrains scalability. Proposals to
+extend the interaction range generally focus on coherent electron transport
+between dots or on extending the coupling range. Here, we study a setup where
+such an extension is obtained by using a superconductor as a quantum mediator.
+Because of its gap, the superconductor effectively acts as a long tunnel
+barrier. We analyze the impact of spin-orbit (SO) coupling, external magnetic
+fields, and the geometry of the superconductor. We show that while spin
+non-conserving tunneling between the dots and the superconductor due to SO
+coupling does not affect the exchange interaction, strong SO scattering in the
+superconducting bulk is detrimental. Moreover, we find that the addition of an
+external magnetic field decreases the strength of the exchange interaction.
+Fortunately, the geometry of the superconducting link offers a lot of room to
+optimize the interaction range, with gains of over an order of magnitude from a
+2D film to a quasi-1D strip. We estimate that for superconductors with weak SO
+coupling (\textit{e.g.}, aluminum) exchange rates of up to 100\,MHz over a
+micron-scale range can be achieved with this setup in the presence of magnetic
+fields of the order of 100\,mT.",2009.05775v1
+2022-03-01,Ultrafast enhancement of interfacial exchange coupling in ferromagnetic bilayer,"Fast spin manipulation in magnetic heterostructures, where magnetic
+interactions between different materials often define the functionality of
+devices, is a key issue in the development of ultrafast spintronics. Although
+recently developed optical approaches such as ultrafast spin-transfer and
+spin-orbit torques open new pathways to fast spin manipulation, these processes
+do not fully utilize the unique possibilities offered by interfacial magnetic
+coupling effects in ferromagnetic multilayer systems. Here, we experimentally
+demonstrate ultrafast photo-enhanced interfacial exchange interactions in the
+ferromagnetic Co$_2$FeAl/(Ga,Mn)As system at low laser fluence levels. The
+excitation efficiency of Co$_2$FeAl with the (Ga,Mn)As layer is 30-40 times
+higher than the case with the GaAs layer at 5 K due to a photo-enhanced
+exchange coupling interaction via photoexcited charge transfer between the two
+ferromagnetic layers. In addition, the coherent spin precessions persist to
+room temperature, excluding the drive of photo-enhanced magnetization in the
+(Ga,Mn)As layer and indicating a proximity-effect-related optical excitation
+mechanism. The results highlight the importance of considering the range of
+interfacial exchange interactions in ferromagnetic heterostructures and how
+these magnetic coupling effects can be utilized for ultrafast, low-power spin
+manipulation.",2203.00293v3
+1999-05-18,First-Principles Calculations of Hyperfine Interactions in La_2CuO_4,"We present the results of first-principles cluster calculations of the
+electronic structure of La_2CuO_4. Several clusters containing up to nine
+copper atoms embedded in a background potential were investigated.
+Spin-polarized calculations were performed both at the Hartree-Fock level and
+with density functional methods with generalized gradient corrections to the
+local density approximation. The distinct results for the electronic structure
+obtained with these two methods are discussed. The dependence of the
+electric-field gradients at the Cu and the O sites on the cluster size is
+studied and the results are compared to experiments. The magnetic hyperfine
+coupling parameters are carefully examined. Special attention is given to a
+quantitative determination of on-site and transferred hyperfine fields. We
+provide a detailed analysis that compares the hyperfine fields obtained for
+various cluster sizes with results from additional calculations of spin states
+with different multiplicities. From this we conclude that hyperfine couplings
+are mainly transferred from nearest neighbor Cu^{2+} ions and that
+contributions from further distant neighbors are marginal. The mechanisms
+giving rise to transfer of spin density are worked out. Assuming conventional
+values for the spin-orbit coupling, the total calculated hyperfine interaction
+parameters are compared to informations from experiments.",9905246v1
+2004-09-13,Manifestation of the spin-Hall effect through transport measurements in the mesoscopic regime,"We study theoretically the manifestation of the spin-Hall effect in a
+two-dimensional electronic system with Rashba spin-orbit coupling via
+dc-transport measurements in realistic mesoscopic H-shape structures. The
+Landauer-Buttiker formalism is used to model samples with mobilities and Rashba
+coupling strengths of current experiments and to demonstrate the appearance of
+a measurable Rashba-coupling dependent voltage. This type of measurement
+requires only metal contacts, i.e., no magnetic elements are present. We also
+confirm the robustness of the intrinsic spin-Hall effect against disorder in
+the mesoscopic metallic regime in agreement with results of exact
+diagonalization studies in the bulk.",0409334v1
+2002-03-04,"Gravitomagnetism in Metric Theories: Analysis of Earth Satellites Results, and its Coupling with Spin","Employing the PPN formalism the gravitomagnetic field in different metric
+theories is considered in the analysis of the LAGEOS results. It will be shown
+that there are several models that predict exactly the same effect that general
+relativity comprises. In other words, these Earth satellites results can be
+taken as experimental evidence that the orbital angular momentum of a body does
+indeed generate space--time geometry, notwithstanding they do not endow general
+relativity with an outstanding status among metric theories. Additionally the
+coupling spin--gravitomagnetic field is analyzed with the introduction of the
+Rabi transitions that this field produces on a quantum system with spin 1/2.
+Afterwards, a continuous measurement of the energy of this system is
+introduced, and the consequences upon the corresponding probabilities of the
+involved gravitomagnetic field will be obtained. Finally, it will be proved
+that these proposals allows us, not only to confront against future experiments
+the usual assumption of the coupling spin--gravotimagnetism, but also to
+measure some PPN parameters and to obtain functional dependences among them.",0203013v1
+1999-11-14,Atomic Quantum Computer,"The current proposals for the realization of quantum computer such as NMR,
+quantum dots and trapped ions are based on the using of an atom or an ion as
+one qubit. In these proposals a quantum computer consists from several atoms
+and the coupling between them provides the coupling between qubits necessary
+for a quantum gate. We discuss whether a {\it single} atom can be used as a
+quantum computer. Internal states of the atom serve to hold the quantum
+information and the spin-orbit and spin-spin interaction provides the coupling
+between qubits in the atomic quantum computer. In particular one can use the
+electron spin resonance (ESR) to process the information encoded in the
+hyperfine splitting of atomic energy levels. By using quantum state engineering
+one can manipulate the internal states of the natural or artificial (quantum
+dot) atom to make quantum computations.",9911062v1
+2009-06-26,Exchange coupling in silicon quantum dots: Theoretical considerations for quantum computation,"We study exchange coupling in Si double quantum dots, which have been
+proposed as suitable candidates for spin qubits due to their long spin
+coherence times. We discuss in detail two alternative schemes which have been
+proposed for implementing spin qubits in quantum dots. One scheme uses spin
+states in a single dot and the interdot exchange coupling controls interactions
+between unbiased dots. The other scheme employs the singlet and triplet states
+of a biased double dot as the two-level system making up the qubit and exchange
+controls the energy splitting of the levels. Exchange in these two
+configurations depends differently on system parameters. Our work relies on the
+Heitler-London approximation and the Hund-Mulliken molecular orbital method.
+The results we obtain enable us to investigate the sensitivity of the system to
+background charge fluctuations and determine the conditions under which optimal
+spots, at which the influence of the charge noise is minimized, may exist in Si
+double quantum dot structures.",0906.4793v3
+2010-01-29,Multichannel effects in Rashba quantum wires,"We investigate intersubband mixing effects in multichannel quantum wires in
+the presence of Rashba spin-orbit coupling and attached to two terminals. When
+the contacts are ferromagnetic and their magnetization direction is
+perpendicular to the Rashba field, the spin-transistor current is expected to
+depend in a oscillatory way on the Rashba coupling strength due to spin
+coherent oscillations of the travelling electrons. Nevertheless, we find that
+the presence of many propagating modes strongly influences the spin precession
+effect, leading to (i) a quenching of the oscillations and (ii) strongly
+irregular curves for high values of the Rashba coupling. We also observe that
+in the case of leads' magnetization parallel to the Rashba field, the
+conductance departs from a uniform value as the Rashba strength increases. We
+also discuss the Rashba interaction induced current polarization effects when
+the contacts are not magnetic and investigate how this mechanism is affected by
+the presence of several propagating channels.",1001.5393v1
+2011-09-06,Two-Dimensional Topological Insulator State and Topological Phase Transition in Bilayer Graphene,"We show that gated bilayer graphene hosts a strong topological insulator (TI)
+phase in the presence of Rashba spin-orbit (SO) coupling. We find that gated
+bilayer graphene under preserved time-reversal symmetry is a quantum valley
+Hall insulator for small Rashba SO coupling $\lambda_{\mathrm{R}}$, and
+transitions to a strong TI when $\lambda_{\mathrm{R}} > \sqrt{U^2+t_\bot^2}$,
+where $U$ and $t_\bot$ are respectively the interlayer potential and tunneling
+energy. Different from a conventional quantum spin Hall state, the edge modes
+of our strong TI phase exhibit both spin and valley filtering, and thus share
+the properties of both quantum spin Hall and quantum valley Hall insulators.
+The strong TI phase remains robust in the presence of weak graphene intrinsic
+SO coupling.",1109.1131v1
+2011-10-07,Nonlinear Dynamics in a Magnetic Josephson Junction,"We theoretically consider a Josephson junction formed by a ferromagnetic
+spacer with a strong spin-orbit interaction or a magnetic spin valve, i.e., a
+bilayer with one static and one free layer. Electron spin transport facilitates
+a nonlinear dynamical coupling between the magnetic moment and charge current,
+which consists of normal and superfluid components. By phenomenologically
+adding reactive and dissipative interactions (guided by structural and Onsager
+symmetries), we construct magnetic torques and charge pumping, whose
+microscopic origins are also discussed. A stability analysis of our coupled
+nonlinear systems generates a rich phase diagram with fixed points, limit
+cycles, and quasiperiodic states. Our findings reduce to the known phase
+diagrams for current-biased nonmagnetic Josephson junctions, on the one hand,
+and spin-torque driven magnetic films, on the other, in the absence of coupling
+between the magnetic and superconducting order parameters.",1110.1680v1
+2012-10-29,Pure spin decoherence in quantum dots,"We uncover two microscopic physical settings with significant pure spin
+decoherence. First, for quantum dots (QD) electrostatically confined in
+two-dimensional hole gas, decoherence comes from qubit spin-orbit (SO) coupling
+to phonons, whose decay due to free charge carriers in contacts is described by
+Ohmic weighted phonon spectral function. We derive significant SO interactions
+affecting holes with origin and symmetry distinct from that of conventionally
+considered Dresselhaus and Rashba terms. In the second setting of electron or
+hole QDs coupled to a linear chain of atoms, decoherence is due to
+spin-dependent coupling to phonons, whose decay due to scattering off the free
+ends of a chain is described by the weighted phonon spectral function inverse
+proportional to frequency. The decoherence rate in both settings is linear in
+temperature.",1210.7825v1
+2013-11-30,Ferroelectric Rashba Semiconductors as a novel class of multifunctional materials,"The discovery of novel properties, effects or microscopic mechanisms in
+modern materials science is often driven by the quest for combining, into a
+single compound, several functionalities: not only the juxtaposition of the
+latter functionalities, but especially their coupling, can open new horizons in
+basic condensed matter physics as well as in technology. Semiconductor
+spintronics makes no exception. In this context, we have discovered by means of
+density-functional simulations that, when a sizeable spin-orbit coupling is
+combined with ferroelectricity, such as in GeTe, one obtains novel
+multifunctional materials - called Ferro-Electric Rashba Semi-Conductors
+(FERSC) - where, thanks to a giant Rashba spin-splitting, the spin texture is
+controllable and switchable via an electric field. This peculiar spin-electric
+coupling can find a natural playground in small-gap insulators, such as
+chalcogenides, and can bring brand new assets into the field of
+electrically-controlled semiconductor spintronics",1312.0095v2
+2016-06-02,"Bicollinear Antiferromagnetic Order, Monoclinic Distortion, and Reversed Resistivity Anisotropy in FeTe as a Result of Spin-Lattice Coupling","The bicollinear antiferromagnetic order experimentally observed in FeTe is
+shown to be stabilized by the coupling $\tilde g_{12}$ between monoclinic
+lattice distortions and the spin-nematic order parameter with $B_{\rm 2g}$
+symmetry, within a three-orbital spin-fermion model studied with Monte Carlo
+techniques. A finite but small value of $\tilde g_{12}$ is required, with a
+concomitant lattice distortion compatible with experiments, and a
+tetragonal-monoclinic transition strongly first order. Remarkably, the
+bicollinear state found here displays a planar resistivity with the ""reversed""
+puzzling anisotropy discovered in transport experiments.Orthorhombic
+distortions are also incorporated and phase diagrams interpolating between
+pnictides and chalcogenides are presented. We conclude that the spin-lattice
+coupling discussed here is sufficient to explain the challenging properties of
+FeTe.",1606.00904v1
+2017-12-16,High pressure electron spin resonance of the endohedral fullerene $^{15}\mathrm{N@C}_{60}$,"We measure the electron spin resonance spectrum of the endohedral fullerene
+molecule $^{15}\mathrm{N@C}_{60}$ at pressures ranging from atmospheric
+pressure to 0.25 GPa, and find that the hyperfine coupling increases linearly
+with pressure. We present a model based on van der Waals interactions, which
+accounts for this increase via compression of the fullerene cage and consequent
+admixture of orbitals with a larger hyperfine coupling. Combining this model
+with theoretical estimates of the bulk modulus, we predict the pressure shift
+and compare it to our experimental results, finding fair agreement given the
+spread in estimates of the bulk modulus. The spin resonance linewidth is also
+found to depend on pressure. This is explained by considering the
+pressure-dependent viscosity of the solvent, which modifies the effect of
+dipolar coupling between spins within fullerene clusters.",1712.05991v1
+2020-08-21,Cavity Control over Heavy-Hole Spin Qubits in Inversion-Symmetric Crystals,"The pseudospin of heavy-holes (HHs) confined in a semiconductor quantum dot
+(QD) represents a promising candidate for a fast and robust qubit. While hole
+spin manipulation by a classical electric field utilizing the Dresselhaus
+spin-orbit interaction (SOI) has been demonstrated, our work explores
+cavity-based qubit manipulation and coupling schemes for inversion-symmetric
+crystals forming a planar HH QD. Choosing the exemplary material Germanium
+(Ge), we derive an effective cavity-mediated ground state spin coupling that
+harnesses the cubic Rashba SOI. In addition, we propose an optimal set of
+parameters which allows for Rabi frequencies in the MHz range, thus entering
+the strong coupling regime of cavity quantum electrodynamics.",2008.09436v1
+2020-08-28,Signatures of nonlinear magnetoelectricity in second harmonic spectra of SU(2) symmetry broken quantum many-body systems,"Quantum mechanical perturbative expressions for second order dynamical
+magnetoelectric (ME) susceptibilities have been derived and calculated for a
+small molecular system using the Hubbard Hamiltonian with SU(2) symmetry
+breaking in the form of spin-orbit coupling (SOC) or spin-phonon coupling.
+These susceptibilities will have signatures in second harmonic generation
+spectra. We show that SU(2) symmetry breaking is the key to generate these
+susceptibilities. We have calculated these ME coefficients by solving the
+Hamiltonian for low lying excited states using Lanczos method. Varying the
+Hubbard term along with SOC strength, we find spin and charge and both
+spin-charge dominated spectra of dynamical ME coefficients. We have shown that
+intensities of the peaks in the spectra are highest when the magnitudes of
+Hubbard term and SOC coupling term are in similar range.",2008.12521v1
+2016-12-21,Superconducting grid-bus surface code architecture for hole-spin qubits,"We present a scalable hybrid architecture for the 2D surface code combining
+superconducting resonators and hole-spin qubits in nanowires with tunable
+direct Rashba spin-orbit coupling. The back-bone of this architecture is a
+square lattice of capacitively coupled coplanar waveguide resonators each of
+which hosts a nanowire hole-spin qubit. Both the frequency of the qubits and
+their coupling to the microwave field are tunable by a static electric field
+applied via the resonator center pin. In the dispersive regime, an entangling
+two-qubit gate can be realized via a third order process, whereby a virtual
+photon in one resonator is created by a first qubit, coherently transferred to
+a neighboring resonator, and absorbed by a second qubit in that resonator.
+Numerical simulations with state-of-the-art coherence times yield gate
+fidelities approaching the $99\%$ fault tolerance threshold.",1612.07292v1
+2021-11-22,Evolution of Interorbital Superconductor to Intraorbital Spin-Density Wave in Layered Ruthenates,"The ruthenate family of layered perovskites has been a topic of intense
+interest with much work dedicated to understanding the superconducting state of
+the single layer, Sr$_2$RuO$_4$. Another longstanding puzzle is the lack of
+superconductivity in its sister compound, Sr$_3$Ru$_2$O$_7$, which constrains
+the possible superconducting mechanisms of Sr$_2$RuO$_4$. Here we address a
+microscopic mechanism that unifies superconducting and spin-density wave order
+in this family of materials. Beginning from a model of Sr$_2$RuO$_4$ featuring
+intraband pseudospin-singlet superconductivity originating from interorbital
+spin-triplet pairing via Hund's and spin-orbit couplings, the addition of
+bilayer coupling and staggered rotations of the oxygen octahedra are
+investigated. We find that the bilayer coupling alone enhances
+superconductivity, while staggered rotations destroy interorbital
+superconductivity, leaving a paramagnetic metal. The magnetic field then shifts
+van Hove singularities near the Fermi level, allowing intraorbital SDW order to
+form in the bilayer. Our theory predicts that bilayer Sr$_3$Ru$_2$O$_7$ without
+staggered rotations exhibits interorbital superconductivity with a possibly
+higher transition temperature.",2111.11452v2
+2022-12-19,An empirical spectroscopic model for eleven electronic states of VO,"Previously-determined empirical energy levels are used to construct a
+rovibronic model for the $\mathrm{X}\,^4\Sigma^-$, $\mathrm{A}'\,^4\Phi$,
+$\mathrm{A}\,^4\Pi$, $\mathrm{B}\,^4\Pi$, $\mathrm{C}\,^4\Sigma^-$,
+$\mathrm{D}\,^4\Delta$, $\mathrm{1}\,^2\Delta$, $\mathrm{1}\,^2\Sigma^+$,
+$\mathrm{1}\,^2\Phi$, $\mathrm{1}\,^2\Pi$ and $\mathrm{2}\,^2\Pi$ electronic
+states of vanadium mononoxide. The spectrum of VO is characterized by many
+couplings and crossings between the states associated with these curves. The
+model is based on the use of potential energy curves, represented as extended
+Morse oscillators, and couplings (spin-orbit, spin-spin, angular momentum),
+represented by polynomials, which are tuned to the data plus an empirical
+allowance for spin-rotation couplings. The curves are used as input for the
+variational nuclear motion code \duo. For the $\mathrm{X}\,^4\Sigma^-$,
+$\mathrm{1}\,^2\Phi$ and $\mathrm{1}\,^2\Pi$ states the model reproduces the
+observed energy to significantly better than 0.1 $\mathrm{cm}^{-1}$. For the
+other states the standard deviations are between 0.25 and 1.5
+$\mathrm{cm}^{-1}$. Further experimental data and consideration of hyperfine
+effects would probably be needed to significantly improve this situation.",2212.09223v1
+2023-09-02,Predication of novel effects in rotational nuclei at high speed,"The study of high-speed rotating matter is a crucial research topic in
+physics due to the emergence of novel phenomena. In this paper, we combined
+cranking covariant density functional theory (CDFT) with a similar
+renormalization group approach to decompose the Hamiltonian from the cranking
+CDFT into different Hermit components, including the non-relativistic term, the
+dynamical term, the spin-orbit coupling, and the Darwin term. Especially, we
+obtained the rotational term, the term relating to Zeeman effect-like, and the
+spin-rotation coupling due to consideration of rotation and spatial component
+of vector potential. By exploring these operators, we aim to identify novel
+phenomena that may occur in rotating nuclei. Signature splitting, Zeeman
+effect-like, spin-rotation coupling, and spin current are among the potential
+novelties that may arise in rotating nuclei. Additionally, we investigated the
+observability of these phenomena and their dependence on various factors such
+as nuclear deformation, rotational angular velocity, and strength of magnetic
+field.",2309.00786v1
+2023-10-05,Boosting the Edelstein effect of two-dimensional electron gases by ferromagnetic exchange,"Strontium titanate (SrTiO$_3$) two-dimensional electron gases (2DEGs) have
+broken spatial inversion symmetry and possess a finite Rashba spin-orbit
+coupling. This enables the interconversion of charge and spin currents through
+the direct and inverse Edelstein effects, with record efficiencies at low
+temperature, but more modest effects at room temperature. Here, we show that
+making these 2DEGs ferromagnetic enhances the conversion efficiency by nearly
+one order of magnitude. Starting from the experimental band structure of
+non-magnetic SrTiO$_3$ 2DEGs, we mimic magnetic exchange coupling by
+introducing an out-of-plane Zeeman term in a tight-binding model. We then
+calculate the band structure and spin textures for increasing internal magnetic
+fields and compute the Edelstein effect using a semiclassical Boltzmann
+approach. We find that the conversion efficiency first increases strongly with
+increasing magnetic field, then shows a maximum and finally decreases. This
+field dependence is caused by the competition of the exchange coupling with the
+effective Rashba interaction. While enhancing the splitting of band pairs
+amplifies the Edelstein effect, weakening the in-plane Rashba-type spin texture
+reduces it.",2310.03348v1
+2019-01-15,Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet,"It has long been speculated that electronic flat band systems can be a
+fertile ground for hosting novel emergent phenomena including unconventional
+magnetism and superconductivity. Although flat bands are known to exist in a
+few systems such as heavy fermion materials and twisted bilayer graphene, their
+microscopic roles and underlying mechanisms in generating emergent behavior
+remain elusive. Here we use scanning tunneling microscopy to elucidate the
+atomically resolved electronic states and their magnetic response in the kagome
+magnet Co3Sn2S2. We observe a pronounced peak at the Fermi level, which is
+identified to arise from the kinetically frustrated kagome flat band.
+Increasing magnetic field up to +-8T, this state exhibits an anomalous
+magnetization-polarized Zeeman shift, dominated by an orbital moment in
+opposite to the field direction. Such negative magnetism can be understood as
+spin-orbit coupling induced quantum phase effects tied to non-trivial flat band
+systems. We image the flat band peak, resolve the associated negative
+magnetism, and provide its connection to the Berry curvature field, showing
+that Co3Sn2S2 is a rare example of kagome magnet where the low energy physics
+can be dominated by the spin-orbit coupled flat band. Our methodology of
+probing band-resolved ordering phenomena such as spin-orbit magnetism can also
+be applied in future experiments to elucidate other exotic phenomena including
+flat band superconductivity and anomalous quantum transport.",1901.04822v2
+2009-01-28,Spatial trends of non-collinear exchange coupling mediated by itinerant carriers with different Fermi surfaces,"We study the exchange coupling mediated by itinerant carriers with spin-orbit
+interaction by both analytic and numeric approaches. The mediated exchange
+coupling is non-collinear and its spatial trends depend on the Fermi surface
+topology of the itinerant carriers. Taking Rashba interaction as an example,
+the exchange coupling is similar to the conventional
+Ruderman-Kittel-Kasuya-Yosida type in weak coupling. On the other hand, in the
+strong coupling, the spiral interaction dominates. In addition, inclusion of
+finite spin relaxation always makes the non-collinear spiral exchange
+interaction dominant. Potential applications of our findings are explained and
+discussed.",0901.4577v1
+2012-09-10,Inelastic Electron Tunneling Spectroscopy for Topological Insulators,"Inelastic Electron Tuneling Spectroscopy (IETS) is a powerful spectroscopy
+that allows one to investigate the nature of local excitations and energy
+transfer in the system of interest. We study IETS for Topological Insulators
+(TI) and investigate the role of inelastic scattering on the Dirac node states
+on the surface of TIs. Local inelastic scattering is shown to significantly
+modify the Dirac node spectrum. In the weak coupling limit, peaks and steps are
+induced in second derivative $d^2I/dV^2$. In the strong coupling limit, the
+local negative U centers are formed at impurity sites, and the Dirac cone
+structure is fully destroyed locally. At intermediate coupling resonance peaks
+emerge. We map out the evolution of the resonance peaks from weak to strong
+coupling, which interpolate nicely between the two limits. There is a sudden
+qualitative change of behavior at intermediate coupling, indicating the
+possible existence of a local quantum phase transition. We also find that even
+for a simple local phonon mode the inherent coupling of spin and orbital
+degrees in TI leads to the spin polarized texture in inelastic Friedel
+oscillations induced by local mode.",1209.2055v1
+2023-09-22,Chaotic motion of scalar particle coupling to Chern-Simons invariant in the stationary axisymmetric Einstein-Maxwell dilaton black hole spacetime,"We investigate the motion of a test scalar particle coupling to the
+Chern-Simons (CS) invariant in the background of a stationary axisymmetric
+black hole in the Einstein-Maxwell-Dilaton-Axion (EMDA) gravity. Comparing with
+the case of a Kerr black hole, we observe that the presence of the dilation
+parameter makes the CS invariant more complex, and changes the range of the
+coupling parameter and the spin parameter where the chaotic motion appears for
+the scalar particle. Moreover, we find that the coupling parameter together
+with the spin parameter also affects the range of the dilation parameter where
+the chaos occurs. We also probe the effects of the dilation parameter on the
+chaotic strength of the chaotic orbits for the coupled particle. Our results
+indicate that the coupling between the CS invariant and the scalar particle
+yields the richer dynamical behavior of the particle in the rotating EMDA black
+hole spacetime.",2309.12604v1
+2024-01-02,Emergence of unstable avoided crossing in the collective excitations of spin-1 spin-orbit coupled Bose-Einstein condensates,"We present the analytical and numerical results on the collective excitation
+spectrum of quasi-one-dimensional spin-orbit (SO) coupled spin-1 Bose-Einstein
+condensates. The collective excitation spectrum, using Bogoliubov-de-Gennes
+theory, reveals the existence of a diverse range of phases in the SO and Rabi
+($k_L-\Omega$) coupling plane. Based on eigenvalue of the excitation spectrum,
+we categorize the $k_L-\Omega$ plane into three distinct regions. In region I,
+a stable mode with phonon-like excitations is observed. In region IIa, single
+and multi-band instabilities are noted with a gapped mode, while multi-band
+instability accompanied by a gapless mode between low-lying and first excited
+states is realized in region IIb, which also provides evidence of unstable
+avoided crossing between low-lying and first excited modes The gap between
+low-lying and first-excited states increases upon increasing the Rabi coupling
+while decreases upon increase of SO coupling. Using eigenvector analysis, we
+confirm the presence of the spin-dipole mode in the spin-like modes in Region
+II. We corroborate the nature of the collective excitation through real-time
+dynamical evolution of the ground state perturbed with the quench of the trap
+using the mean-field Gross-Pitaevskii model. This analysis suggests the
+presence of dynamical instability leading to the disappearance of the $0$-th
+component of the condensate. In Region III, mainly encompassing $\Omega \sim 0$
+and finite $k_L$, we observe phonon-like excitations in both the first excited
+and the low-lying state. The eigenvectors in this region reveal alternative in-
+and out-of-phase behaviours of the spin components. Numerical analysis reveals
+the presence of a super stripe phase for small Rabi coupling in this region,
+wherein the eigenvector indicates the presence of more complicated
+spin-like-density mixed modes.",2401.01310v1
+2015-11-24,Realization of Two-Dimensional Spin-orbit Coupling for Bose-Einstein Condensates,"Cold atoms with laser-induced spin-orbit (SO) interactions provide intriguing
+new platforms to explore novel quantum physics beyond natural conditions of
+solids. Recent experiments demonstrated the one-dimensional (1D) SO coupling
+for boson and fermion gases. However, realization of 2D SO interaction, a much
+more important task, remains very challenging. Here we propose and
+experimentally realize, for the first time, 2D SO coupling and topological band
+with $^{87}$Rb degenerate gas through a minimal optical Raman lattice scheme,
+without relying on phase locking or fine tuning of optical potentials. A
+controllable crossover between 2D and 1D SO couplings is studied, and the SO
+effects and nontrivial band topology are observed by measuring the atomic cloud
+distribution and spin texture in the momentum space. Our realization of 2D SO
+coupling with advantages of small heating and topological stability opens a
+broad avenue in cold atoms to study exotic quantum phases, including the
+highly-sought-after topological superfluid phases.",1511.08170v1
+2019-07-05,"Fourier transform spectroscopy, relativistic electronic structure calculation, and coupled-channel deperturbation analysis of the fully mixed $A^1Σ^+_u$ and $b^3Π_u$ states of Cs$_2$","The 4503 rovibronic term values belonging to the mutually perturbed
+$A^1\Sigma^+_u$ and $b^3\Pi_u$ states of Cs$_2$ were extracted from laser
+induced fluorescence (LIF) $A\sim b\rightarrow X^1\Sigma^+_g$ Fourier transform
+spectra with the 0.01 cm$^{-1}$ uncertainty. The experimental term values of
+the $A^1\Sigma^+_u\sim b^3\Pi_u$ complex covering the rotational levels $J\in
+[4,395]$ in the excitation energy range $[9655,13630]$ cm$^{-1}$ were involved
+into coupled-channel (CC) deperturbation analysis. The deperturbation model
+takes explicitly into account spin-orbit coupling of the
+$A^1\Sigma^+_u(A0^+_u)$ and $b^3\Pi^+_{0_u}(b0^+_u)$ states as well as
+spin-rotational interaction between the $\Omega=0$, $1$ and $2$ components of
+the $b^3\Pi^+_{\Omega_u}$ state. The \emph{ab initio} relativistic calculations
+on the low-lying electronic states of Cs$_2$ were accomplished in the framework
+of Fock space relativistic coupled cluster (FSRCC) approach to provide the
+interatomic potentials of the interacting $A0^+_u$ and $b0^+_u$ states as well
+as the relevant $A\sim b$ spin-orbit coupling function. To validate the present
+CC deperturbation analysis solely obtained by energy-based data, the $A\sim b
+\to X(v^{\prime\prime}_X)$ LIF intensity distributions were measured and
+compared with their theoretical counterparts obtained by means of the
+non-adiabatic vibrational wave functions of the $A\sim b$ complex and the FSRCC
+$A\sim b \to X$ transition dipole moments calculated by the finite-field
+method.",1907.02716v1
+2019-02-15,Interlayer RKKY Coupling in Bulk Rashba Semiconductors under Topological Phase Transition,"The bulk Rashba semiconductors BiTeX (X=I, Cl and Br) with intrinsically
+enhanced Rashba spin-orbit coupling provide a new platform for investigation of
+spintronic and magnetic phenomena in materials. We theoretically investigate
+the interlayer exchange interaction between two ferromagnets deposited on
+opposite surfaces of a bulk Rashba semiconductor BiTeI in its trivial and
+topological insulator phases. In the trivial phase BiTeI, we find that for
+ferromagnets with a magnetization orthogonal to the interface, the exchange
+coupling is reminiscent of that of a conventional three-dimensional metal.
+Remarkably, ferromagnets with a magnetization parallel to the interface display
+a magnetic exchange qualitatively different from that of conventional
+three-dimensional metal due to the spin-orbit coupling. In this case, the
+interlayer exchange interaction acquires two periods of oscillations and decays
+as the inverse of the thickness of the BiTeI layer. For topological BiTeI, the
+magnetic exchange interaction becomes mediated only by the helical surface
+states and acts between the one-dimensional spin chains at the edges of the
+sample. The surface state-mediated interlayer exchange interaction allows for
+the coupling of ferromagnets with non-collinear magnetization and displays a
+decay power different from that of trivial BiTeI, allowing the detection of the
+topological phase transition in this material. Our work provides insights into
+the magnetic properties of these newly discovered materials and their possible
+functionalization.",1902.06001v2
+1999-10-14,Effect of symmetry breaking perturbations in the one-dimensional SU(4) spin-orbital model,"We study the effect of symmetry breaking perturbations in the one-dimensional
+SU(4) spin-orbital model. We allow the exchange in spin ($J_1$) and orbital
+($J_2$) channel to be different and thus reduce the symmetry to SU(2) $\otimes$
+SU(2). A magnetic field $h$ along the $S^z$ direction is also applied. Using
+the formalism developped by Azaria et al we extend their analysis of the
+isotropic $J_1=J_2$, h=0 case and obtain the low-energy effective theory near
+the SU(4) point in the asymmetric case. An accurate analysis of the
+renormalization group flow is presented with a particular emphasis on the
+effect of the anisotropy. In zero magnetic field, we retrieve the same
+qualitative low-energy physics than in the isotropic case. In particular, the
+massless behavior found on the line $J_1=J_2>K/4$ extends in a large
+anisotropic region. We discover though that the anisotropy plays its trick in
+allowing non trivial scaling behaviors of the physical quantities. When a
+magnetic field is present the effect of the anisotropy is striking. In addition
+to the usual commensurate-incommensurate phase transition that occurs in the
+spin sector of the theory, we find that the field may induce a second
+transition of the KT type in the remaining degrees of freedom to which it does
+not couple directly. In this sector, we find that the effective theory is that
+of an SO(4) Gross-Neveu model with an h-dependent coupling that may change its
+sign as h varies.",9910218v2
+2010-09-24,First-post-Newtonian quadrupole tidal interactions in binary systems,"We consider tidal coupling in a binary stellar system to first-post-Newtonian
+order. We derive the orbital equations of motion for bodies with spins and mass
+quadrupole moments and show that they conserve the total linear momentum of the
+binary. We note that spin-orbit coupling must be included in a 1PN treatment of
+tidal interactions in order to maintain consistency (except in the special case
+of adiabatically induced quadrupoles); inclusion of 1PN quadrupolar tidal
+effects while omitting spin effects would lead to a failure of momentum
+conservation for generic evolution of the quadrupoles. We use momentum
+conservation to specialize our analysis to the system's center-of-mass-energy
+frame; we find the binary's relative equation of motion in this frame and also
+present a generalized Lagrangian from which it can be derived. We then
+specialize to the case in which the quadrupole moment is adiabatically induced
+by the tidal field (in which case it is consistent to ignore spin effects). We
+show how the adiabatic dynamics for the quadrupole can be incorporated into our
+action principle and present the simplified orbital equations of motion and
+conserved energy for the adiabatic case. These results are relevant to
+gravitational wave signals from inspiralling binary neutron stars.",1009.4919v3
+2016-09-30,Chiral magnetism of magnetic adatoms generated by Rashba electrons,"We investigate long-range chiral magnetic interactions among adatoms mediated
+by surface states spin-splitted by spin-orbit coupling. Using the Rashba model,
+the tensor of exchange interactions is extracted wherein a pseudo-dipolar
+interaction is found besides the usual isotropic exchange interaction and the
+Dzyaloshinskii-Moriya interaction. We find that, despite the latter
+interaction, collinear magnetic states can still be stabilized by the
+pseudo-dipolar interaction. The inter-adatom distance controls the strength of
+these terms, which we exploit to design chiral magnetism in Fe nanostructures
+deposited on Au(111) surface. We demonstrate that these magnetic interactions
+are related to superpositions of the out-of-plane and in-plane components of
+the skyrmionic magnetic waves induced by the adatoms in the surrounding
+electron gas. We show that, even if the inter-atomic distance is large, the
+size and shape of the nanostructures dramatically impacts on the strength of
+the magnetic interactions, thereby affecting the magnetic ground state. We also
+derive an appealing connection between the isotropic exchange interaction and
+the Dzyaloshinskii-Moriya interaction, which relates the latter to the first
+order change of the former with respect to the spin-orbit coupling. This
+implies that the chirality defined by the direction of the
+Dzyaloshinskii-Moriya vector is driven by the variation of the isotropic
+exchange interaction due to the spin-orbit interaction.",1609.09690v1
+2020-07-07,Spin-Orbit Exciton in a Honeycomb Lattice Magnet CoTiO$_3$: Revealing Link Between Rare Earth and Transition Metal Magnetism,"We carried out inelastic neutron scattering to study the spin-orbital (SO)
+exciton in a single crystal sample of CoTiO$_3$ as a function of temperature.
+CoTiO$_3$ is a honeycomb magnet with dominant XY-type magnetic interaction and
+an A-type antiferromagnetic order below $\mathrm{T_N} \approx 38$~K. We found
+that the SO exciton becomes softer, but acquires a larger bandwidth in the
+paramagnetic phase, compared to that in the magnetically ordered phase.
+Moreover, an additional mode is only observed in the intermediate temperature
+range, as the sample is warmed up above the lowest accessible temperature below
+$\mathrm{T_N}$. Such an unusual temperature dependence observed in this
+material suggests that its ground states (an $S_{\mathrm{eff}}=\frac{1}{2}$
+doublet) and excited states multiplets are strongly coupled, and therefore
+cannot be treated independently, as often done in a pseudo-spin model. Our
+observations can be explained by a multi-level theory within random phase
+approximation that explicitly takes into account both the ground and excited
+multiplets. The success of our theory, which is originally developed to explain
+temperature dependence of magnetic excitations in the rare-earth magnets,
+highlight the similarity between the magnetic excitations in rare-earth systems
+and those in transition metal systems with strong spin orbit coupling.",2007.03764v1
+2016-08-12,Spin-orbit coupled fermions in an optical lattice clock,"Engineered spin-orbit coupling (SOC) in cold atom systems can aid in the
+study of novel synthetic materials and complex condensed matter phenomena.
+Despite great advances, alkali atom SOC systems are hindered by heating from
+spontaneous emission, which limits the observation of many-body effects,
+motivating research into potential alternatives. Here we demonstrate that SOC
+can be engineered to occur naturally in a one-dimensional fermionic 87Sr
+optical lattice clock (OLC). In contrast to previous SOC experiments, in this
+work the SOC is both generated and probed using a direct ultra-narrow optical
+clock transition between two electronic orbital states. We use clock
+spectroscopy to prepare lattice band populations, internal electronic states,
+and quasimomenta, as well as to produce SOC dynamics. The exceptionally long
+lifetime of the excited clock state (160 s) eliminates decoherence and atom
+loss from spontaneous emission at all relevant experimental timescales,
+allowing subsequent momentum- and spin-resolved in situ probing of the SOC band
+structure and eigenstates. We utilize these capabilities to study Bloch
+oscillations, spin-momentum locking, and Van Hove singularities in the
+transition density of states. Our results lay the groundwork for the use of
+OLCs to probe novel SOC phases of matter.",1608.03854v2
+2019-04-10,Testing the Wave-Particle Duality of Gravitational Wave Using the Spin-Orbital-Hall Effect of Structured Light,"Probing the polarization of gravitational waves (GWs) would provide an
+evidence of graviton, indicating the quantization of gravity. Motivated by the
+next generation of gravitational wave detectors, we make an attempt to study
+the possible helicity coupling of structured lights to GWs. With the analogue
+between of gravitational fields and the generic electromagnetic media, we
+present a 4-vector optical Dirac equation based on the Maxwell theory under the
+paraxial approximation. It is found that twisted lights propagating in a
+gravitational field can be viewed as a non-Hermitian system with the
+$\mathcal{PT}$ symmetry. We further demonstrate that the coupling effect
+between angular momentums of the GWs and twisted lights may make photons
+undergo both dipole and quadrupole transitions between different
+orbital-angular-momentum(OAM) eigenstates and leads to some measurable optical
+features, including the central intensity brightening and macroscopic rotation
+of the intensity pattern for twisted lights. The former is spin-independent
+while the later is spin dependent phenomena, both of which can be viewed
+alternatively as the spin-orbital-Hall effect of structured lights in the GWs
+and can serve as an indicator of the particle nature of GWs.",1904.05380v3
+2019-11-27,Spin-dimer ground state driven by consecutive charge and orbital ordering transitions in the anionic mixed-valence compound Rb$_4$O$_6$,"Recently, a Verwey-type transition in the mixed-valence alkali sesquioxide
+Cs$_4$O$_6$ was deduced from the charge ordering of molecular peroxide
+O$_2^{2-}$ and superoxide O$_2^-$ anions accompanied by the structural
+transformation and a dramatic change in electronic conductivity [Adler et al,
+Sci. Adv 4, eaap7581 (2018)]. Here, we report that in the sister compound
+Rb$_4$O$_6$ a similar Verwey-type charge ordering transition is strongly linked
+to O$_2^-$ orbital and spin dynamics. On cooling, a powder neutron diffraction
+experiment reveals a charge ordering and a cubic-to-tetragonal transition at
+$T_{\rm CO}=290$ K, which is followed by a further structural instability at
+$T_{\rm s}=92$ K that involves an additional reorientation of magnetic O$_2^-$
+anions. Magnetic resonance techniques supported by density functional theory
+computations suggest the emergence of a peculiar type of $\pi^*$-orbital
+ordering of the magnetically active O$_2^-$ units, which promotes the formation
+of a quantum spin state composed of weakly coupled spin dimers. These results
+reveal that similarly as in 3$d$ transition metal compounds, also in in the
+$\pi^*$ open-shell alkali sesquioxides the interplay between Jahn-Teller-like
+electron-lattice coupling and Kugel-Khomskii-type superexchange determines the
+nature of orbital ordering and the magnetic ground state.",1911.12049v1
+2019-12-19,Stabilizing Even-Parity Chiral Superconductivity in Sr$_2$RuO$_4$,"Strontium ruthenate (Sr$_2$RuO$_4$) has long been thought to host a
+spin-triplet chiral $p$-wave superconducting state. However, the singletlike
+response observed in recent spin-susceptibility measurements casts serious
+doubts on this pairing state. Together with the evidence for broken
+time-reversal symmetry and a jump in the shear modulus $c_{66}$ at the
+superconducting transition temperature, the available experiments point towards
+an even-parity chiral superconductor with $k_z(k_x\pm ik_y)$-like $E_g$
+symmetry, which has consistently been dismissed based on the
+quasi-two-dimensional electronic structure of Sr$_2$RuO$_4$. Here, we show how
+the orbital degree of freedom can encode the two-component nature of the $E_g$
+order parameter, allowing for a local orbital-antisymmetric spin-triplet state
+that can be stabilized by on-site Hund's coupling. We find that this exotic
+$E_g$ state can be energetically stable once a complete, realistic
+three-dimensional model is considered, within which momentum-dependent
+spin-orbit coupling terms are key. This state naturally gives rise to
+Bogoliubov Fermi surfaces.",1912.09525v2
+2021-07-21,Chiral Dirac-like fermion in spin-orbit-free antiferromagnetic semimetals,"Dirac semimetal is a phase of matter, whose elementary excitation is
+described by the relativistic Dirac equation. In the limit of zero mass, its
+parity-time symmetry enforces the Dirac fermion in the momentum space, which is
+composed of two Weyl fermions with opposite chirality, to be non-chiral.
+Inspired by the flavor symmetry in particle physics, we theoretically propose a
+massless Dirac-like equation yet linking two Weyl fields with the identical
+chirality by assuming SU(2) isospin symmetry, independent of the space-time
+rotation exchanging the two fields. Dramatically, such symmetry is hidden in
+certain solid-state spin-1/2 systems with negligible spin-orbit coupling, where
+the spin degree of freedom is decoupled with the lattice. Therefore, the
+existence of the corresponding quasiparticle, dubbed as flavor Weyl fermion,
+cannot be explained by the conventional (magnetic) space group framework. The
+four-fold degenerate flavor Weyl fermion manifests linear dispersion and a
+Chern number of 2, leading to a robust network of topologically protected Fermi
+arcs throughout the Brillouin zone. For material realization, we show that the
+transition-metal chalcogenide CoNb3S6 with experimentally confirmed collinear
+antiferromagnetic order is ideal for flavor Weyl semimetal under the
+approximation of vanishing spin-orbit coupling. Our work reveals a counterpart
+of the flavor symmetry in magnetic electronic systems, leading to further
+possibilities of emergent phenomena in quantum materials.",2107.09984v3
+2023-04-25,Bose-Einstein condensations of magnons in quantum magnets with spin-orbit coupling in a Zeeman field,"We study the response of a quantum magnet with spin-orbit coupling (SOC) to a
+Zeeman field by constructing effective actions and performing Renormalization
+Group (RG) analysis. There are several novel classes of quantum phase
+transitions at a low $ h_{c1} $ and an upper critical field $ h_{c2} $ driven
+by magnon condensations at commensurate (C-) or in-commensurate (IC-) momenta $
+0 < k_0 < \pi $. The intermediate IC- Skyrmion crystal (IC-SkX) phase is
+controlled by a line of fixed points in the RG flows labeled by $ k_0 $. We
+derive the relations between the quantum spin and the order parameters of the
+effective actions which determine the spin-orbital structures of the IC-SkX
+phase. We also analyze the operator contents near $ h_{c1} $ and $ h_{c2} $
+which determine the exotic excitation spectra inside the IC-SkX. The intrinsic
+differences between the magnon condensations at the C- and IC- momenta are
+explored. The two critical fields $ h_{c1} < h_{c2} $ and the intermediate
+IC-SkX phase could be a generic feature to any quantum magnets with SOC in a
+Zeeman field. Experimental implications to some materials or cold atom systems
+with SOC in a Zeeman field are presented.",2304.12612v1
+2023-11-07,Revealing the ultra-fast domain wall motion in Manganese Gold through permalloy capping,"Antiferromagnets offer much faster dynamics compared to their ferromagnetic
+counterparts but their order parameter is extremely difficult to detect and
+control. So far, controlling the N\'eel order parameter electrically is limited
+to only very few materials where N\'eel spin-orbit torques are allowed by
+symmetry. In this work, we show that coupling a thin ferromagnet (permalloy)
+layer on top of an antiferromagnet (Mn$_2$Au) solves a major roadblock -- the
+controlled reading, writing, and manipulation of antiferromagnetic domains. We
+confirm by atomistic spin dynamics simulations that the domain wall patterns in
+the Mn$_2$Au are imprinted on the permalloy, therefore allowing for indirect
+imaging of the N\'eel order parameter. Our simulations show that the coupled
+domain wall structures in Mn$_2$Au-Py bilayers can be manipulated by either
+acting on the N\'eel order parameter via N\'eel spin-orbit torques or by acting
+on the magnetisation (the ferromagnetic order parameter) via magnetic fields.
+In both cases, we predict ultra-high domain wall speeds on the order of 8.5
+km/s. Thus, employing a thin ferromagnetic layer has the potential to easily
+control the N\'eel order parameter in antiferromagnets even where N\'eel
+spin-orbit torques are forbidden by symmetry. The controlled manipulation of
+the antiferromagnetic order parameter provides a promising basis for the
+development of high-density storage and efficient computing technologies
+working in the THz regime.",2311.04305v1
+2024-03-07,Light-induced giant enhancement of nonreciprocal transport at KTaO3-based interfaces,"Nonlinear transport is a unique functionality of noncentrosymmetric systems,
+which reflects profound physics, such as spin-orbit interaction,
+superconductivity and band geometry. However, it remains highly challenging to
+enhance the nonreciprocal transport for promising rectification devices. Here,
+we observe a light-induced giant enhancement of nonreciprocal transport at the
+superconducting and epitaxial CaZrO3/KTaO3 (111) interfaces. The nonreciprocal
+transport coefficient undergoes a giant increase with three orders of magnitude
+up to 105 A-1T-1. Furthermore, a strong Rashba spin-orbit coupling effective
+field of 14.7 T is achieved with abundant high-mobility photocarriers under
+ultraviolet illumination, which accounts for the giant enhancement of
+nonreciprocal transport coefficient. Our first-principles calculations further
+disclose the stronger Rashba spin-orbit coupling strength and the longer
+relaxation time in the photocarrier excitation process, bridging the
+light-property quantitative relationship. Our work provides an alternative
+pathway to boost nonreciprocal transport in noncentrosymmetric systems and
+facilitates the promising applications in opto-rectification devices and
+spin-orbitronic devices.",2403.04515v1
+2001-04-27,Spin dynamical properties and orbital states of the layered perovskite La_2-2x_Sr_1+2x_Mn_2_O_7 (0.3 <= x < 0.5),"Low-temperature spin dynamics of the double-layered perovskite
+La_2-2x_Sr_1+2x_Mn_2_O_7 (LSMO327) was systematically studied in a wide hole
+concentration range (0.3 <= x < 0.5). The spin-wave dispersion, which is almost
+perfectly 2D, has two branches due to a coupling between layers within a
+double-layer. Each branch exhibits a characteristic intensity oscillation along
+the out-of-plane direction. We found that the in-plane spin stiffness constant
+and the gap between the two branches strongly depend on x. By fitting to
+calculated dispersion relations and cross sections assuming Heisenberg models,
+we have obtained the in-plane (J_para), intra-bilayer (J_perp) and
+inter-bilayer (J') exchange interactions at each x. At x=0.30, J_para=-4meV and
+J_perp=-5meV, namely almost isotropic and ferromagnetic. Upon increasing x,
+J_perp rapidly approaches zero while |J_para| increases slightly, indicating an
+enhancement of the planar magnetic anisotropy. At x=0.48, J_para reaches -9meV,
+while J_perp turns to +1meV indicating an antiferromagnetic interaction. Such a
+drastic change of the exchange interactions can be ascribed to the change of
+the relative stability of the d_x^2-y^2 and d_3z^2-r^2 orbital states upon
+doping. However, a simple linear combination of the two states results in an
+orbital state with an orthorhombic symmetry, which is inconsistent with the
+tetragonal symmetry of the crystal structure. We thus propose that an ``orbital
+liquid'' state realizes in LSMO327, where the charge distribution symmetry is
+kept tetragonal around each Mn site.",0104535v1
+2014-03-17,SeD Radical: A probe for measurement of time variation of Fine Structure Constant($α$) and Proton to Electron Mass Ratio($μ$),"Based on the spectroscopic constants derived from highly accurate potential
+energy surfaces, the SeD radical is identified as a spectroscopic probe for
+measuring spatial and temporal variation of fundamental physical constants such
+as the fine-structure constant (denoted as $\alpha=\frac{e^2}{\hbar c}$) and
+the proton-to-electron mass ratio (denoted as $\mu=\frac{m_p}{m_e}$). The
+ground state of SeD ($X^2\Pi$), due to spin-orbit coupling, splits into two
+fine structure multiplets $^2\Pi_{\frac{3}{2}}$ and $^2\Pi_{\frac{1}{2}}$. The
+potential energy surfaces of these spin-orbit components are derived from a
+state of the art electronic structure method, MRCI+Q inclusive of scalar
+relativistic effects with the spin-orbit effects accounted through the
+Breit-Pauli operator. The relevant spectroscopic data are evaluated using
+Murrel-Sorbie fit to the potential energy surfaces. The spin-orbit
+splitting($\omega_f$) between the two multiplets is similar in magnitude with
+the harmonic frequency ($\omega_e$) of the diatomic molecule. The amplification
+factor derived from this theoretical method for this particular molecule can be
+as large as 350, on the lower side it can be about 34. The significantly large
+values of K indicate that SeD radical can be a plaussible experimental
+candidate for measuring variation in $\alpha$ and $\mu$.",1403.4061v2
+2017-04-20,Mixing of spin and orbital angular momenta via second-harmonic generation in plasmonic and dielectric chiral nanostructures,"We present a theoretical study of the characteristics of the nonlinear
+spin-orbital angular momentum coupling induced by second-harmonic generation in
+plasmonic and dielectric nanostructures made of centrosymmetric materials. In
+particular, the connection between the phase singularities and polarization
+helicities in the longitudinal components of the fundamental and
+second-harmonic optical fields and the scatterer symmetry properties are
+discussed. By in-depth comparison between the interaction of structured optical
+beams with plasmonic and dielectric nanostructures, we have found that
+all-dielectric and plasmonic nanostructures that exhibit magnetic and electric
+resonances have comparable second-harmonic conversion efficiency. In addition,
+mechanisms for second-harmonic enhancement for single and chiral clusters of
+scatterers are unveiled and the relationships between the content of optical
+angular momentum of the incident optical beams and the enhancement of nonlinear
+light scattering is discussed. In particular, we formulate a general angular
+momenta conservation law for the nonlinear spin-orbital angular momentum
+interaction, which includes the quasi-angular-momentum of chiral structures
+with different-order rotational symmetry. As a key conclusion of our study
+relevant to nanophotonics, we argue that all-dielectric nanostructures provide
+a more suitable platform to investigate experimentally the nonlinear
+interaction between spin and orbital angular momenta, as compared to plasmonic
+ones, chiefly due to their narrower resonance peaks, lower intrinsic losses,
+and higher sustainable optical power.",1704.07451v1
+2009-12-16,Nuclear energy density functional from chiral pion-nucleon dynamics revisited,"We use a recently improved density-matrix expansion to calculate the nuclear
+energy density functional in the framework of in-medium chiral perturbation
+theory. Our calculation treats systematically the effects from $1\pi$-exchange,
+iterated $1\pi$-exchange, and irreducible $2\pi$-exchange with intermediate
+$\Delta$-isobar excitations, including Pauli-blocking corrections up to
+three-loop order. We find that the effective nucleon mass $M^*(\rho)$ entering
+the energy density functional is identical to the one of Fermi-liquid theory
+when employing the improved density-matrix expansion. The strength
+$F_\nabla(\rho)$ of the $(\vec\nabla \rho)^2$ surface-term as provided by the
+pion-exchange dynamics is in good agreement with that of phenomenological
+Skyrme forces in the density region $\rho_0/2 <\rho <\rho_0$. The spin-orbit
+coupling strength $F_{so}(\rho)$ receives contributions from iterated
+$1\pi$-exchange (of the ``wrong sign'') and from three-nucleon interactions
+mediated by $2\pi$-exchange with virtual $\Delta$-excitation (of the ``correct
+sign''). In the region around $\rho_0/2 \simeq 0.08 $fm$^{-3}$ where the
+spin-orbit interaction in nuclei gains most of its weight these two components
+tend to cancel, thus leaving all room for the short-range spin-orbit
+interaction. The strength function $F_J(\rho)$ multiplying the square of the
+spin-orbit density comes out much larger than in phenomenological Skyrme forces
+and it has a pronounced density dependence.",0912.3207v1
+2018-07-04,An orbitally derived single-atom magnetic memory,"A single magnetic atom on a surface epitomizes the scaling limit for magnetic
+information storage. Indeed, recent work has shown that individual atomic spins
+can exhibit magnetic remanence and be read out with spin-based methods,
+demonstrating the fundamental requirements for magnetic memory. However, atomic
+spin memory has been only realized on thin insulating surfaces to date,
+removing potential tunability via electronic gating or distance-dependent
+exchange-driven magnetic coupling. Here, we show a novel mechanism for
+single-atom magnetic information storage based on bistability in the orbital
+population, or so-called valency, of an individual Co atom on semiconducting
+black phosphorus (BP). Distance-dependent screening from the BP surface
+stabilizes the two distinct valencies and enables us to electronically
+manipulate the relative orbital population, total magnetic moment and spatial
+charge density of an individual magnetic atom without a spin-dependent readout
+mechanism. Furthermore, we show that the strongly anisotropic wavefunction can
+be used to locally tailor the switching dynamics between the two valencies.
+This orbital memory derives stability from the energetic barrier to atomic
+relaxation and demonstrates the potential for high-temperature single-atom
+information storage.",1807.01668v1
+2019-02-25,Hourglass Weyl loops in two dimensions: Theory and material realization in monolayer GaTeI family,"Nodal loops in two-dimensional (2D) systems are typically vulnerable against
+spin-orbit coupling (SOC). Here, we explore 2D systems with a type of doubly
+degenerate nodal loops that are robust under SOC and feature an hourglass type
+dispersion. We present symmetry conditions for realizing such hourglass Weyl
+loops, which involve nonsymmorphic lattice symmetries. Depending on the
+symmetry, the loops may exhibit different patterns in the Brillouin zone. Based
+on first-principles calculations, we identify the monolayer GaTeI-family
+materials as a realistic material platform to realize such loops. These
+materials host a single hourglass Weyl loop circling around a high-symmetry
+point. Interestingly, there is also a spin-orbit Dirac point enabled by an
+additional screw axis. We show that the hourglass Weyl loop and the Dirac point
+are robust under a variety of applied strains. By breaking the screw axis, the
+Dirac point can be transformed into a second Weyl loop. Furthermore, by
+breaking the glide mirror, the hourglass Weyl loop and the spin-orbit Dirac
+point can both be transformed into a pair of spin-orbit Weyl points. Our work
+offers guidance and realistic material candidates for exploring fascinating
+physics of several novel 2D emergent fermions.",1902.09283v2
+2020-10-02,Singular magnetic anisotropy in the nematic phase of FeSe,"FeSe is arguably the simplest, yet the most enigmatic, iron-based
+superconductor. Its nematic but non-magnetic ground state is unprecedented in
+this class of materials and stands out as a current puzzle. Here, our NMR
+measurements in the nematic state of mechanically detwinned FeSe reveal that
+both the Knight shift and the spin-lattice relaxation rate 1/T_1 possess an
+in-plane anisotropy opposite to that of the iron pnictides LaFeAsO and
+BaFe2As2. Using a microscopic electron model that includes spin-orbit coupling,
+our calculations show that an opposite quasiparticle weight ratio between the
+d_xz and d_yz orbitals leads to an opposite anisotropy of the orbital magnetic
+susceptibility, which explains our Knight shift results. We attribute this
+property to a different nature of nematic order in the two compounds,
+predominantly bond-type in FeSe and onsite ferro-orbital in pnictides. The T_1
+anisotropy is found to be inconsistent with existing neutron scattering data in
+FeSe, showing that the spin fluctuation spectrum reveals surprises at low
+energy, possibly from fluctuations that do not break C_4 symmetry. Therefore,
+our results reveal that important information is hidden in these anisotropies
+and they place stringent constraints on the low-energy spin correlations as
+well as on the nature of nematicity in FeSe.",2010.01020v1
+2021-01-01,Nuclear charge densities in spherical and deformed nuclei: towards precise calculations of charge radii,"Background: Precise measurements of atomic transitions affected by
+electron-nucleus hyperfine interactions offer sensitivity to explore basic
+properties of the atomic nucleus and study fundamental symmetries, including
+the search for new physics beyond the Standard Model of particle physics. Such
+measurements impose higher precision requirements on a theoretical description.
+  Purpose: The nuclear charge density is composed of the proton point
+distribution folded with the nucleonic charge distributions. The latter induce
+subtle relativistic corrections due to the coupling of nucleon magnetic moments
+with the nuclear spin-orbit density. We assess the precision of nuclear charge
+density calculations by studying the behavior of relativistic corrections.
+  Methods: The calculations are performed using Skyrme energy density
+functionals and density-dependent pairing force. We used the general expression
+for the spin-orbit form factor that is valid for spherical and deformed nuclei.
+  Results: We studied the impact of various correction terms on the charge
+radii, fourth radial moments, diffraction radii, and surface thickness of
+spherical and deformed nuclei. The spin-orbit corrections to charge radial
+moments and surface thickness show strong shell fluctuations which impact
+high-precision predictions of isotopic shifts.
+  Conclusions: To establish reliable constraints on the existence of new forces
+from isotope shift measurements,precise calculations of nuclear charge
+densities of deformed nuclei are needed. The proper inclusion of the spin-orbit
+charge density and other correction terms is essential when aiming at
+extraction of subtle effects which become particularly visible in isotopic
+trends.",2101.00320v3
+2021-06-23,Impact of the spin-orbit interaction on the phase diagram and anisotropy of the in-plane critical magnetic field in superconducting LaAlO$_3$/SrTiO$_3$ interface,"The two-dimensional electron gas at the interface between LaAlO$_3$ and
+SrTiO$_3$ (LAO/STO) exhibits gate tunable superconductivity with a
+characteristic dome-like shape of the critical temperature ($T_c$) in the phase
+diagram. As shown recently [Phys. Rev. B 102, 085420 (2020)], such an effect
+can be explained as a consequence of the extended $s-$wave symmetry of the gap
+within an intersite real space pairing scenario, leading to a good agreement
+between the experiment and theory. In this work, we turn to a detailed analysis
+of the influence of spin-orbit coupling on the LAO/STO phase diagram by
+considering the atomic and the Rashba components. In particular, we analyze the
+optimal carrier concentration for which the maximal $T_c$ is reached relative
+to the Lifshitz transition point. We find that the a misalignment between the
+two can be significantly enhanced by the spin-orbit splitting of the bands,
+combined with the fact that superconductivity sets in when the Fermi level
+passes the anticrossing induced by the spin-orbital hybridization. In the
+presence of the external in-plane magnetic field, our calculations show
+four-fold anisotropy with the paramagnetic limit largely exceeded for $B_{||}$
+directed along the high symmetry points [01] and [01]. The obtained electron
+concentration dependence of $B_{c||}$ reproduces the characteristic dome-like
+shape reported in experiments and the estimated value of $B_{c||}$ corresponds
+to that measured experimentally.",2106.12317v1
+2021-12-08,Monolayer RhB4: half-auxeticity and almost ideal spin-orbit Dirac point semimetal,"Structural-property relationship, the connection between materials'
+structures and their properties, is central to the materials research.
+Especially at reduced dimensions, novel structural motifs often generate unique
+physical properties.Motivated by a recent work reporting a novel half auxetic
+effect in monolayer PdB4 with a hypercoordinated structure, here, we
+extensively explore similar 2D transition metal boride structures MB4 with M
+covering 3d and 4d elements.Our investigation screens out one stable candidate,
+the monolayer RhB4. We find that monolayer RhB4 also shows half auxeticity,
+i.e., the material always expands in a lateral in-plane direction in response
+to an applied strain in the other direction, regardless of whether the strain
+is positive or negative.We show that this special mechanical character is
+intimately tied to the hypercoordinated structure with the M\c{opyright}B8
+structural motif. Furthermore, regarding electronic properties, monolayer RhB4
+is found to be the first example of an almost ideal 2D spin-orbit Dirac point
+semimetal.The low-energy band structure is clean, with a pair of fourfold
+degenerate Dirac points robust under spin-orbit coupling located close to the
+Fermi level. These Dirac points are enforced by the nonsymmorphic space group
+symmetry which is also determined by the lattice structure. Our work deepens
+the fundamental understanding of structural-property relationship in reduced
+dimensions. The half auxeticity and the spin-orbit Dirac points will make
+monolayer RhB4 a promising platform for nanomechanics and nanoelectronics
+applications.",2112.04157v1
+2023-06-19,Formation of spin-orbital entangled 2D electron gas in layer delta-doped bilayer iridate La$_δ$Sr$_3$Ir$_2$O$_7$,"5$d$ transition metal oxides host a variety of exotic phases due to the
+comparable strength of Coulomb repulsion and spin-orbit coupling. Herein, by
+pursuing density-functional studies on a delta-doped quasi-two-dimensional
+iridate Sr$_3$Ir$_2$O$_7$, where a single SrO layer is replaced by LaO layer,
+we predict the formation of a spin-orbital entangled two-dimensional electron
+gas (2DEG) which is sharply confined on two IrO$_2$ layers close to the LaO
+layer. In this bilayer crystal structure, an existing potential well is further
+augmented with the inclusion of positively charged LaO layer which results in
+confining the extra valence electron made available by the La$^{3+}$ ion. The
+confined electron is bound along crystal $a$ direction and is highly mobile in
+the $bc$ plane. From the band structure point of view, now the existing
+half-filled $J_{eff}$ = 1/2 states are further electron doped to destroy the
+antiferromagnetic Mott insulating state of IrO$_2$ layers near to the
+delta-doped layer. This leads to partially occupied Ir upper-Hubbard subbands
+which host the spin-orbital entangled 2DEG. The IrO$_2$ layers far away from
+the interface remain insulating and preserve the collinear G-type magnetic
+ordering of pristine Sr$_3$Ir$_2$O$_7$. The conductivity tensors calculated
+using semi-classical Boltzmann theory at room temperature reveal that the 2DEG
+exhibits large electrical conductivity of the order of 10$^{19}$.",2306.10978v2
+1994-06-06,"Van Hove Exciton-Cageons and High-T$_c$ Superconductivity, XA: Role of Spin-Orbit Coupling in Generating a Diabolical Point","Spin-orbit coupling plays a large role in stabilizing the low-temperature
+orthorhombic phase of La$_{2-x}$Sr$_x$CuO$_4$. It splits the degeneracy of the
+van Hove singularities (thereby stabilizing the distorted phase) and completely
+changes the shape of the Fermi surfaces, potentially introducing diabolical
+points into the band structure. The present paper gives a detailed account of
+the resulting electronic structure.
+  A slave boson calculation shows how these results are modified in the
+presence of strong correlation effects. A scaling regime, found very close to
+the metal-insulator transition, allows an analytical determination of the
+crossover, in the limit of zero oxygen-oxygen hopping, $t_{OO}\rightarrow 0$.
+Extreme care must exercised in chosing the parameters of the three-band model.
+In particular, $t_{OO}$ is renormalized from its LDA value. Furthermore, it is
+suggested that the slave boson model be spin-corrected, in which case the
+system is close to a metal-insulator transition at half filling.",9406026v1
+1998-09-01,Spin gap in low-dimensional Mott insulators with orbital degeneracy,"We consider the exchange Hamiltonian H_ST = -J Sum_{<rr'>} (2 S_r S_r' - 1/2)
+(2 T_r T_r' - 1/2) describing two isotropic spin-1/2 Heisenberg
+antiferromagnets coupled by a quartic term on equivalent bonds. The model is
+relevant for systems with orbital degeneracy and strong electron-vibron
+coupling in the large Hubbard repulsion limit. To investigate the ground state
+properties we use a Green's Function Monte Carlo, calculating energy gaps and
+correlation functions, the latter through the forward walking technique. In one
+dimension we find that the ground state is a ``crystal'' of valence bond
+dimers. In two dimensions, the spin gap appears to remain finite in the
+thermodynamic limit, and, consistently, the staggered magnetization -- signal
+of Neel long range order -- seems to vanish. From the analysis of dimer-dimer
+correlation functions, however, we find no sign of a valence bond crystal. A
+spin liquid appears as a plausible scenario compatible with our findings.",9809013v1
+1999-06-23,Spin-orbit coupling effect on quantum Hall ferromagnets with vanishing Zeeman energy,"We present the phase diagram of a ferromagnetic quantum Hall effect liquid in
+a narrow quantum well with vanishing single-particle Zeeman splitting,
+$\epsilon_{{\rm Z}}$ and pronounced spin-orbit coupling. Upon decreasing
+$\epsilon_{{\rm Z}}$, the spin-polarization field of a liquid takes, first, the
+easy-axis configuration, followed by the formation of a helical state, which
+affects the transport and NMR properties of a liquid and the form of
+topological defects in it. The analysis is extended over high odd integer
+filling factors.",9906354v2
+2004-06-01,Order parameter in superconductors with non-degenerate bands,"In noncentrosymmetric metals, the spin degeneracy of the electronic bands is
+lifted by spin-orbit coupling. We consider general symmetry properties of the
+pairing function Delta(k) in noncentrosymmetric superconductors with spin-orbit
+coupling (NSC), including CePt3Si, UIr and Cd2Re2O7. We find that Delta(k) =
+chi(k) t(k), where chi(k) is an even function which transforms according to the
+irreducible representations of the crystallographic point group and t(k) is a
+model dependent phase factor. We consider tunnelling between a NSC and a
+conventional superconductor. It is found that, in terms of thermodynamical
+properties as well as the Josephson effect, the state of NSC resembles a
+singlet superconducting state with gap function chi(k).",0406003v2
+2006-04-13,Realization of arbitrary single-qubit gates through control of spin-orbit couplings in semiconductor nanowires,"We propose a theoretical scheme to realize arbitrary single-qubit gates
+through two simple device units: one-dimensional semiconductor wires with
+Dresselhaus spin-orbit coupling (SOC) and Rashba SOC, separately. Qubit
+information coded by the electron spin can be accurately manipulated by the SOC
+when crossing the semiconductor wire. The different manipulative behaviors in
+Dresselhaus and Rashba wires enable us to make the diverse quantum logic gates.
+Furthermore, by connecting the Dresselhaus and Rashba units in series, we
+obtain a universal set of single qubit gates: Hadamard, phase, and $\pi /8$
+gates, inferring that an arbitrary single qubit gate can be achieved. Because
+the total transmission is satisfied in the two device units, all the logic
+gates we have obtained are lossless. In addition, a ballistic spintronic switch
+is proposed in the present investigation.",0604346v1
+2006-10-03,Tunneling anisotropic magnetoresistance driven by resonant surface states: First-principles calculations of Fe(001) surface,"Fully-relativistic first-principles calculations of the Fe(001) surface
+demonstrate that resonant surface (interface) states may produce sizeable
+tunneling anisotropic magnetoresistance in magnetic tunnel junctions with a
+single magnetic electrode. The effect is driven by the spin-orbit coupling. It
+shifts the resonant surface band via the Rashba effect when the magnetization
+direction changes. We find that spin-flip scattering at the interface is
+controlled not only by the strength of the spin-orbit coupling, but depends
+strongly on the intrinsic width of the resonant surface states.",0610061v2
+2006-11-28,Distribution of spectral-flow gaps in the Rashba model with disorder: a new universality,"We report a study of disordered electron systems with spin-orbit coupling on
+a cylinder using methods of random matrix ensembles. With a threading flux
+turned on, the single particle levels will generally avoid, rather than cross,
+each other. Our numerical study of the level-avoiding gaps in the disordered
+Rashba model demonstrates that the normalized gap distribution is of a
+universal form, independent of the random strength and the system size. For
+small gaps it exhibits a linear behavior, while for large gaps it decays
+exponentially. A framework based on matrix mechanical models is suggested, and
+is verified to reproduce the universal linear behavior at small gaps. Thus we
+propose to use the distribution of the spectral-flow gaps associated with flux
+insertion as a new way to characterize 2d random systems with spin-orbit
+coupling. The relevance and qualitative implications for spin (Hall) transport
+are also addressed.",0611696v2
+2007-11-16,First-principles study of the lattice and electronic structures of TbMn$_2$O$_5$,"The structural, electronic and lattice dielectric properties of multiferroic
+TbMn$_2$O$_5$ are investigated using density functional theory within the
+generalized gradient approximation (GGA). We use collinear spin approximations
+and ignore the spin-orbit coupling. The calculated structural parameters are in
+excellent agreement with the experiments. We confirm that the ground state
+structure of TbMn$_2$O$_5$ is of space group $Pb2_1m$, allowing polarizations
+along the b-axis. The spontaneous electric polarization is calculated to be
+1187 $nC\cdot$cm$^{-2}$. The calculated zone-center optical phonons frequencies
+and the oscillator strengths of IR phonons agree very well with the
+experimental values. We then derive an effective Hamiltonian to explain the
+magnetically-induced ferroelectricity in this compound. Our results strongly
+suggest that the ferroelectricity in TbMn$_2$O$_5$ is driven by the magnetic
+ordering that breaks the the inversion symmetry, without invoking the
+spin-orbit coupling.",0711.2539v1
+2007-12-19,Coulomb correlation in presence of spin-orbit coupling: application to plutonium,"Attempts to go beyond the local density approximation (LDA) of Density
+Functional Theory (DFT) have been increasingly based on the incorporation of
+more realistic Coulomb interactions. In their earliest implementations, methods
+like LDA+$U$, LDA + DMFT (Dynamical Mean Field Theory), and LDA+Gutzwiller used
+a simple model interaction $U$. In this article we generalize the solution of
+the full Coulomb matrix involving $F^{(0)}$ to $F^{(6)}$ parameters, which is
+usually presented in terms of an $\ell m_\ell$ basis, into a $jm_{j}$ basis of
+the total angular momentum, where we also include spin-orbit coupling; this
+type of theory is needed for a reliable description of $f$-state elements like
+plutonium, which we use as an example of our theory. Close attention will be
+paid to spin-flip terms, which are important in multiplet theory but that have
+been usually neglected in these kinds of studies. We find that, in a
+density-density approximation, the $jm_j$ basis results provide a very good
+approximation to the full Coulomb matrix result, in contrast to the much less
+accurate results for the more conventional $\ell m_\ell$ basis.",0712.3100v1
+2008-03-20,Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4,"We investigated electronic structure of 5d transition-metal oxide Sr2IrO4
+using angle-resolved photoemission, optical conductivity, and x-ray absorption
+measurements and first-principles band calculations. The system was found to be
+well described by novel effective total angular momentum Jeff states, in which
+relativistic spin-orbit (SO) coupling is fully taken into account under a large
+crystal field. Despite of delocalized Ir 5d states, the Jeff-states form so
+narrow bands that even a small correlation energy leads to the Jeff = 1/2 Mott
+ground state with unique electronic and magnetic behaviors, suggesting a new
+class of the Jeff quantum spin driven correlated-electron phenomena.",0803.2927v1
+2008-05-21,Friedel oscillations induced surface magnetic anisotropy,"We present detailed numerical studies of the magnetic anisotropy energy of a
+magnetic impurity near the surface of metallic hosts (Au and Cu), that we
+describe in terms of a realistic tight-binding surface Green's function
+technique. We study the case when spin-orbit coupling originates from the
+d-band of the host material and we also investigate the case of a strong local
+spin-orbit coupling on the impurity itself. The splitting of the impurity's
+spin-states is calculated to leading order in the exchange interaction between
+the impurity and the host atoms using a diagrammatic Green's function
+technique. The magnetic anisotropy constant is an oscillating function of the
+separation d from the surface: it asymptotically decays as 1/d2 and its
+oscillation period is determined by the extremal vectors of the host's Fermi
+Surface. Our results clearly show that the host-induced magnetic anisotropy
+energy is by several orders of magnitude smaller than the anisotropy induced by
+the local mechanism, which provides sufficiently large anisotropy values to
+explain the size dependence of the Kondo resistance observed experimentally.",0805.3275v1
+2008-06-10,Pseudo spin-orbit coupling of Dirac particles in graphene spintronics,"We study the pseudo spin-orbital (SO) effects experienced by massive Dirac
+particles in graphene, which can potentially be of a larger magnitude compared
+to the conventional Rashba SO effects experienced by particles in a 2DEG
+semiconductor heterostructure. In order to generate a uniform vertical pseudo
+SO field, we propose an artificial atomic structure, consisting of a graphene
+ring and a charged nanodot at the center which produces a large radial electric
+field. In this structure, a large pseudo SO coupling strength can be achieved
+by accelerating the Dirac particles around the ring, due to the small energy
+gap in graphene and the large radial electric field emanating from the charged
+nanodot. We discuss the theoretical possibility of harnessing the pseudo SO
+effects in mesoscopic applications, e.g. pseudo spin relaxation and switching.",0806.1568v1
+2008-08-05,Colossal enhancement of upper critical fields in noncentrosymmetric heavy fermion superconductors near quantum criticality: CeRhSi$_3$ and CeIrSi$_3$,"Strong coupling effects on the upper critical fields $H_{c2}$ along the
+c-axis in the noncentrosymmetric heavy fermion superconductors near quantum
+criticality CeRhSi$_3$ and CeIrSi$_3$ are examined. For sufficiently large
+spin-orbit interactions due to the lack of inversion symmetry, $H_{c2}$ is
+mainly determined by the orbital depairing effects. From microscopic
+calculations taking into account the strong spin fluctuations, we show that
+$H_{c2}$ is extremely enhanced as the system approaches the quantum critical
+point, resulting in $H_{c2}\sim 30$T even in the case with the low transition
+temperature $T_c(H=0)\sim 1$K, which well explains the huge $H_{c2}$ observed
+in the recent experiments. Our results reveal intrinsic and universal
+properties common to strong coupling superconductivity caused by spin
+fluctuations near quantum criticality.",0808.0545v1
+2009-07-22,Enhanced spin-orbit coupling in hydrogenated and fluorinated graphenes studied from first principles,"The spin-orbit couplings (SOCs) of hydrogenated and fluorinated graphenes are
+calculated from the first principles method. It is found that the SOC-induced
+band splittings near their Fermi energies can be significantly enhanced to the
+order of 10$^{-2}$ eV from the original about 10$^{-6}$ eV of the pure raphene,
+which is comparable to those found in the diamond and even the archetypal
+semiconductors. And two different mechanisms are proposed to explain the SOC
+enhancements in these two systems. The huge SOC enhancements are found to come
+not only from the sp$^3$ hybridization of carbon atoms, but also from the
+larger intrinsic SOC of the fluorine atom than the carbon one. We hope many
+interesting phenomena caused by the SOCs (e.g. the spin Hall effect) can be
+observed experimentally in these systems.",0907.3779v1
+2010-10-18,Theory of electric polarization in multi-orbital Mott insulators,"The interaction between the electric field, E, and spins in multi-orbital
+Mott insulators is studied theoretically. We find a generic dynamical coupling
+mechanism, which works for all crystal lattices and which does not involve
+relativistic effects. The general form of the coupling is -T_ab E_a e_b, where
+e is the `internal' electric field originating from the dynamical Berry phase
+of electrons and T_ab is a tensor determined by lattice symmetry. We discuss
+several effects of this interaction: (i) an unusual electron spin resonance
+induced by an oscillating electric field, (ii) the displacement of spin
+textures in an applied electric field, and (iii) the resonant absorption of
+circularly polarized light by Skyrmions, magnetic bubbles, and magnetic
+vortices.",1010.3687v1
+2011-01-05,Mott Physics and Topological Phase Transition in Correlated Dirac Fermions,"We investigate the interplay between the strong correlation and the
+spin-orbital coupling in the Kane-Mele-Hubbard model and obtain the qualitative
+phase diagram via the variational cluster approach. We identify, through an
+increase of the Hubbard $U$, the transition from the topological band insulator
+to either the spin liquid phase or the easy-plane antiferromagnetic insulating
+phase, depending on the strength of the spin-orbit coupling. A nontrivial
+evolution of the bulk bands in the topological quantum phase transition is also
+demonstrated.",1101.0911v1
+2011-08-05,Vortex structures of rotating spin-orbit coupled Bose-Einstein condensates,"We consider the quasi-2D two-component Bose-Einstein condensates with Rashba
+spin-orbit (SO) coupling in a rotating trap. An external Zeeman term favoring
+spin polarization along the radial direction is also considered, which has the
+same form as the non-canonical part of the mechanical angular momentum. The
+rotating condensate exhibits rich structures as varying the strengths of
+trapping potential and interaction. With a strong trapping potential, the
+condensate exhibits a half-quantum vortex-lattice configuration. Such a
+configuration is driven to the normal one by introducing the external radial
+Zeeman field. In the case of a weak trap potential, the condensate exhibits a
+multi-domain pattern of plane-wave states under the external radial Zeeman
+field.",1108.1238v4
+2011-09-27,Exotic superfluidity in spin-orbit coupled Bose-Einstein condensates,"We study the superfluidity of a spin-orbit coupled Bose-Einstein condensate
+(BEC) by computing its Bogoliubov excitations, which are found to consist of
+two branches: one is gapless and phonon-like at long wavelength; the other is
+typically gapped. These excitations imply a superfluidity that has two new
+features: ({\it i}) due to the absence of the Galilean invariance, one can no
+longer define the critical velocity of superfluidity independent of the
+reference frame; ({\it ii}) the superfluidity depends not only on whether the
+speed of the BEC exceeds a critical value, but also on {\it cross helicity}
+that is defined as the direction of the cross product of the spin and the
+kinetic momentum of the BEC.",1109.5811v3
+2012-08-13,Possible pairing symmetries in SrPtAs with a local lack of inversion center,"We discuss possible pairing symmetries in the hexagonal pnictide
+superconductor SrPtAs. The local lack of inversion symmetry of the two distinct
+conducting layers in the unit cell results in a special spin-orbit coupling
+with a staggered structure. We classify the pairing symmetry by the global
+crystal point group D_3d, and suggest some candidates for the stable state
+using a tight-binding model with an in-plane, density-density type pairing
+interaction. We may have some unconventional states like s+f-wave and a mixture
+of chiral d-wave and chiral p-wave. The spin orbit coupling is larger than the
+interlayer hopping, and the mixing between spin-singlet and triplet states can
+be seen in spite of the fact that the system has a global inversion center.",1208.2541v1
+2013-03-28,Edge states and topological properties of electrons on the bismuth on silicon surface with giant spin-orbit coupling,"We derive a model of localized edge states in the finite width strip for
+two-dimensional electron gas formed in the hybrid system of bismuth monolayer
+deposited on the silicon interface and described by the nearly-free electron
+model with giant spin-orbit splitting. The edge states have the energy
+dispersion in the bulk energy gap with the Dirac-like linear dependence on the
+quasimomentum and the spin polarization coupled to the direction of
+propagation, demonstrating the properties of topological insulator. The
+topological stability of edge states is confirmed by the calculations of the
+$Z_2$ invariant taken from the structure of the Pfaffian for the time reversal
+operator for the filled bulk bands in the surface Brillouin zone which is shown
+to have a stable number of zeros with the variations of material parameters.
+The proposed properties of the edge states may support future advances in
+experimental and technological applications of this new material in
+nanoelectronics and spintronics.",1303.7104v3
+2013-06-11,Magnetically generated spin-orbit coupling for ultracold atoms,"We present a new technique for producing two- and three-dimensional
+Rashba-type spin-orbit couplings for ultracold atoms without involving light.
+The method relies on a sequence of pulsed inhomogeneous magnetic fields
+imprinting suitable phase gradients on the atoms. For sufficiently short pulse
+durations, the time-averaged Hamiltonian well approximates the Rashba
+Hamiltonian. Higher order corrections to the energy spectrum are calculated
+exactly for spin-1/2 and perturbatively for higher spins. The pulse sequence
+does not modify the form of rotationally symmetric atom-atom interactions.
+Finally, we present a straightforward implementation of this pulse sequence on
+an atom chip.",1306.2606v2
+2013-10-31,Gap solitons in the spin-orbit coupled Bose-Einstein condensates,"We report a diversity of stable gap solitons in a spin-orbit coupled
+Bose-Einstein condensate subject to a spatially periodic Zeeman field. It is
+shown that the solitons, can be classified by the main physical symmetries they
+obey, i.e. symmetries with respect to parity (P), time (T), and internal degree
+of freedom, i.e. spin, (C) inversions. The conventional gap and gap-stripe
+solitons are obtained in lattices with different parameters. It is shown that
+solitons of the same type but obeying different symmetries can exist in the
+same lattice at different spatial locations. PT and CPT symmetric solitons have
+anti-ferromagnetic structure and are characterized respectively by nonzero and
+zero total magnetizations.",1310.8517v1
+2014-01-22,Current-induced magnetization dynamics at the edge of a two-dimensional electron system with strong spin-orbit coupling,"We experimentally investigate electron transport through the interface
+between a permalloy ferromagnet and the edge of a two-dimensional electron
+system with strong Rashba-type spin-orbit coupling. We observe strongly
+non-linear transport around zero bias at millikelvin temperatures. The observed
+nonlinearity is fully suppressed above some critical values of temperature,
+magnetic field, and current through the interface. We interpret this behavior
+as the result of spin accumulation at the interface and its current-induced
+absorption as a magnetization torque.",1401.5719v2
+2014-04-22,Constituents of magnetic anisotropy and a screening of spin-orbit coupling in solids,"Using quantum mechanical perturbation theory (PT) we analyze how the energy
+of perturbation of different orders is renormalized in solids. We test the
+validity of PT analysis by considering a specific case of spin-orbit coupling
+as a perturbation. We further compare the relativistic energy and the magnetic
+anisotropy from the PT approach with direct density functional calculations in
+FePt, CoPt, FePd, MnAl, MnGa, FeNi, and tetragonally strained FeCo. In addition
+using decomposition of anisotropy into contributions from individual sites and
+different spin components we explain the microscopic origin of high anisotropy
+in FePt and CoPt magnets.",1404.5546v2
+2014-07-02,Quantum correlations in bulk properties of solids obtained from neutron scattering,"We demonstrate that inelastic neutron scattering technique can be used to
+indirectly detect and measure the macroscopic quantum correlations quantified
+by both entanglement and discord in a quantum magnetic material, VODPO4 . 1D2O.
+The amount of quantum correlations is obtained 2 by analyzing the neutron
+scattering data of magnetic excitations in isolated V4+ spin dimers. Our
+quantitative analysis shows that the critical temperature of this material can
+reach as high as Tc = 82.5 K, where quantum entanglement drops to zero.
+Significantly, quantum discord can even survive at Tc = 300 K and may be used
+in room temperature quantum devices. Taking into account the spin-orbit (SO)
+coupling, we also predict theoretically that entanglement can be significantly
+enhanced and the critical temperature Tc increases with the strength of
+spin-orbit coupling.",1407.0633v1
+2014-07-09,Effective field theory for the bulk-edge correspondence in a two-dimensional Z_2 topological insulator with Rashba interactions,"We determine the effective field theory in (2+1)-dimensional space and time
+that captures the long wave length and low-energy limit of fermions hopping on
+a honeycomb lattice at half-filling when both a dominant intrinsic and
+subdominant Rashba spin-orbit couplings are present. This effective field
+theory for a Z_2 topological insulator (the Kane-Mele model at vanishing
+uniform and staggered chemical potentials) is a perturbation around a double
+Chern-Simons theory, with the U(1) gauge invariance associated to spin
+conservation explicitly broken due to the Rashba spin orbit coupling.
+Nonetheless, we find that the effective field theory has a BRST symmetry that
+allows us to construct the bulk-edge correspondence.",1407.2633v2
+2014-09-15,Repulsively interacting fermions in a two-dimensional deformed trap with spin-orbit coupling,"We investigate a two-dimensional system of with two values of the internal
+(spin) degree of freedom. It is confined by a deformed harmonic trap and
+subject to a Zeeman field, Rashba or Dresselhaus one-body spin-orbit couplings
+and two-body short range repulsion. We obtain self-consistent mean-field
+$N$-body solutions as functions of the interaction parameters. Single-particle
+Spectra and total energies are computed and compared to the results without
+interaction. We perform a statistical analysis for the distributions of nearest
+neighbor energy level spacings and show that quantum signatures of chaos are
+seen in certain parameters regimes. Furthermore, the effects of two-body
+repulsion on the nearest neighbor distributions are investigated. This
+repulsion can either promote or destroy the signatures of potential chaotic
+behavior depending on relative strengths of parameters. Our findings support
+the suggestion that cold atoms may be used to study quantum chaos both in the
+presence and absence of interactions.",1409.4206v3
+2014-09-16,Topological Insulator to Dirac Semimetal Transition Driven by Sign Change of Spin-Orbit Coupling in Thallium Nitride,"Based on the first-principles calculations, we reveal that TlN, a simple
+binary compound with Wurtzite structure, is a three-dimensional (3D)
+topological insulator (TI) with effectively negative spin-orbit coupling
+$\lambda_{eff} < 0$, which makes it distinguished from other TIs by showing
+opposite spin-momentum locking effect in its surface states. The sign of
+$\lambda_{eff}$ depends on the hybridization between N-$2p$ and Tl-$5d$ states,
+and can be tuned from negative to postive by lattice strain or chemical
+substitution, which drive the system into a Dirac semimetal with 3D Dirac cones
+in its bulk states. Such topological phase transition can be realized by
+electronic mechanism without breaking any crystal symmetry.",1409.4534v1
+2014-12-11,Artificial Magnetic Fields in Momentum Space in Spin-Orbit Coupled Systems,"The Berry curvature is a geometrical property of an energy band which can act
+as a momentum space magnetic field in the effective Hamiltonian of a wide range
+of systems. We apply the effective Hamiltonian to a spin-1/2 particle in two
+dimensions with spin-orbit coupling, a Zeeman field and an additional harmonic
+trap. Depending on the parameter regime, we show how this system can be
+described in momentum space as either a Fock-Darwin Hamiltonian or a
+one-dimensional ring pierced by a magnetic flux. With this perspective, we
+interpret important single-particle properties, and identify analogue magnetic
+phenomena in momentum space. Finally we discuss the extension of this work to
+higher spin systems, as well as experimental applications in ultracold atomic
+gases and photonic systems.",1412.3638v2
+2015-01-19,Triangular Spin-Orbit-Coupled Lattice with Strong Coulomb Correlations: Sn Atoms on a SiC(0001) Substrate,"Two-dimensional (2D) atom lattices provide model setups for Coulomb
+correlations inducing competing ground states, partly with topological
+character. Hexagonal SiC(0001) is an intriguing wide-gap substrate,
+spectroscopically separated from the overlayer and hence reduced screening. We
+report the first study of an artificial high-Z atom lattice on SiC(0001) by Sn
+adatoms, based on combined experimental realization and theoretical modeling.
+Density-functional theory of our $\sqrt{3}$-structure model closely reproduces
+the scanning tunneling microscopy. Instead of metallic behavior, photoemission
+data show a deeply gapped state (~2 eV gap). Based on our calculations
+including dynamic mean-field theory, we argue that this reflects a pronounced
+Mott insulating scenario. We also find indications that the system is
+susceptible to antiferromagnetic superstructures. Such spin-orbit-coupled
+correlated heavy atom lattices on SiC(0001) thus form a novel testbed for
+peculiar quantum states of matter, with potential bearing for spin liquids and
+topological Mott insulators.",1501.04602v1
+2015-01-30,"Parity-breaking phases of spin-orbit-coupled metals with gyrotropic, ferroelectric and multipolar orders","We study Fermi liquid instabilities in spin-orbit-coupled metals with
+inversion symmetry. By introducing a canonical basis for the doubly degenerate
+Bloch bands in momentum space, we derive the general form of interaction
+functions. A variety of time-reversal-invariant, parity-breaking phases is
+found, whose Fermi surface is spontaneously deformed and spin-split. In terms
+of symmetry, these phases possess gyrotropic, ferroelectric and multipolar
+orders. The ferroelectric and multipolar phases are accompanied by structural
+distortions, from which the electronic orders can be identified. The gyrotropic
+phase exhibits a unique nonlinear optical property. Based on recent
+experiments, we identify several interesting quantum materials including
+pyrochlore oxides, which show evidence of these parity breaking orders.",1502.00015v2
+2015-03-13,Entanglement like properties in Spin-Orbit Coupled Ultra Cold Atom and violation of Bell like Inequality,"We show that the general quantum state of synthetically spin-orbit coupled
+ultra cold bosonic atom whose condensate was experimentally created recently (
+Y. J. Lin {\it et al.}, Nature, {\bf 471}, 83, (2011)), shows entanglement
+between motional degrees of freedom ( momentum) and internal degrees of freedom
+(hyperfine spin). We demonstrate the violation of Bell-like inequality (CHSH)
+for such states that provides a unique opportunity to verify fundamental
+principle like quantum non-contextuality for commutating observables which are
+not spatially separated. We analyze in detail the Rabi oscillation executed by
+such atom-laser system and how that influneces quantities like entanglement
+entropy, violation of Bell like Inequality etc. We also discuss the implication
+of our result in testing the quantum non-contextuality and Bell's Inequality
+vioaltion by macroscopic quantum object like Bose-Einstein Condensate of ultra
+cold atoms.",1503.03999v1
+2015-04-06,Direct Observation of High-Spin States in Manganese Dimer and Trimer Cations by X-ray Magnetic Circular Dichroism Spectroscopy in an Ion Trap,"The electronic structure and magnetic moments of free Mn$_2^+$ and Mn$_3^+$
+are characterized by $2p$ x-ray absorption and x-ray magnetic circular
+dichroism spectroscopy in a cryogenic ion trap that is coupled to a synchrotron
+radiation beamline. Our results show directly that localized magnetic moments
+of 5 $\mu_B$ are created by $3d^5 (^6\mathrm{S})$ states at each ionic core,
+which are coupled in parallel to form molecular high-spin states via indirect
+exchange that is mediated in both cases by a delocalized valence electron in a
+singly-occupied $4s$ derived orbital with an unpaired spin. This leads to total
+magnetic moments of 11 $\mu_B$ for Mn$_2^+$ and 16 $\mu_B$ for Mn$_3^+$, with
+no contribution of orbital angular momentum.",1504.01411v1
+2015-05-22,Mobile vector soliton in a spin-orbit coupled spin-$1$ condensate,"We study the formation of bound states and three-component bright vector
+solitons in a quasi-one-dimensional spin-orbit-coupled hyperfine spin $f=1$
+Bose-Einstein condensate using numerical solution and variational approximation
+of a mean-field model. In the antiferromagnetic domain, the solutions are
+time-reversal symmetric, and the component densities have multi-peak structure.
+In the ferromagnetic domain, the solutions violate time-reversal symmetry, and
+the component densities have single-peak structure. The dynamics of the system
+is not Galelian invariant. From an analysis of Galelian invariance, we
+establish that the single-peak ferromagnetic vector solitons are true solitons
+and can move maintaining constant component densities, whereas the
+antiferromagnetic solitons cannot move with constant component densities.",1505.06193v1
+2015-05-23,Optical Lattice Modulation Spectroscopy for Spin-orbit Coupled Bosons,"Interacting bosons with two ""spin'' states in a lattice show novel
+superfluid-insulator phase transitions in the presence of spin-orbit coupling.
+Depending on the parameter regime, bosons in the superfluid phase can condense
+to either a zero momentum state or to one or multiple states with finite
+momentum, leading to an unconventional superfluid phase. We study the response
+of such a system to modulation of the optical lattice potential. We show that
+the change in momentum distribution after lattice modulation shows distinct
+patterns in the Mott and the superfluid phase and these patterns can be used to
+detect these phases and the quantum phase transition between them. Further, the
+momentum resolved optical modulation spectroscopy can identify both the gapless
+(Goldstone) gapped amplitude (Higgs) mode of the superfluid phase and clearly
+distinguish between the superfluid phases with a zero momentum condensate and a
+twisted superfluid phase by looking at the location of these modes in the
+Brillouin zone. We discuss experiments which can test our theory.",1505.06372v2
+2015-09-19,Synthetic spin-orbit coupling in an optical lattice clock,"We propose the use of optical lattice clocks operated with fermionic
+alkaline-earth-atoms to study spin-orbit coupling (SOC) in interacting
+many-body systems. The SOC emerges naturally during the clock interrogation
+when atoms are allowed to tunnel and accumulate a phase set by the ratio of the
+""magic"" lattice wavelength to the clock transition wavelength. We demonstrate
+how standard protocols such as Rabi and Ramsey spectroscopy, that take
+advantage of the sub-Hertz resolution of state-of-the-art clock lasers, can
+perform momentum-resolved band tomography and determine SOC-induced $s$-wave
+collisions in nuclear spin polarized fermions. By adding a second
+counter-propagating clock beam a sliding superlattice can be implemented and
+used for controlled atom transport and as a probe of $p$ and $s$-wave
+interactions. The proposed spectroscopic probes provide clean and well-resolved
+signatures at current clock operating temperatures.",1509.05846v1
+2016-01-06,Harmonically Trapped Atoms with Spin-Orbit Coupling,"We study harmonically trapped one-dimensional atoms subjected to an equal
+combination of Rashba and Dresselhaus spin-orbit coupling induced by Raman
+transition. We first examine the wave function and the degeneracy of the
+single-particle ground state, followed by a study of two weakly interacting
+bosons or fermions. For the two-particle ground state, we focus on the effects
+of the interaction on the degeneracy, the spin density profiles, and the
+density-density correlation functions. Finally we show how these studies help
+us to understand the many-body properties of the system.",1601.01335v2
+2016-02-25,"Rashba spin-orbit coupling, strong interactions, and the BCS-BEC crossover in the ground state of the two-dimensional Fermi Gas","The recent experimental realization of spin-orbit coupled Fermi gases
+provides a unique opportunity to study the interplay between strong interaction
+and SOC in a tunable, disorder-free system. We present here precision ab initio
+numerical results on the two-dimensional, unpolarized, uniform Fermi gas with
+attractive interactions and Rashba SOC. Using auxiliary-field quantum Monte
+Carlo and incorporating recent algorithmic advances, we carry out exact
+calculations on sufficiently large system sizes to provide accurate results
+systematically as a function of experimental parameters. We obtain the equation
+of state, the momentum distributions, the pseudo-spin correlations and the
+pairing wave functions. Our results help illuminate the rich pairing structure
+induced by SOC, and provide benchmarks for theory and guidance to future
+experimental efforts.",1602.08046v1
+2016-04-22,"On the Bargmann-Michel-Telegdi equations, and spin-orbit coupling: a tribute to Raymond Stora","The Bargmann-Michel-Telegdi equations describing the motions of a spinning,
+charged, relativistic particle endowed with an anomalous magnetic moment in an
+electromagnetic field, are reconsidered. They are shown to duly stem from the
+linearization of the characteristic distribution of a pre-symplectic structure
+refining the original one of Souriau. In this model, once specialized to the
+case of a static electric-like field, the angular momentum and energy given by
+the associated moment map now correctly restore the spin-orbit coupling term.
+This is the state-of-the-art of unfinished joint work with Raymond Stora.",1604.06550v1
+2016-07-09,Phase tunable Josephson junction and spontaneous mass current in a spin-orbit coupled Fermi superfluid,"Atomtronics has the potential for engineering new types of functional
+devices, such as Josephson junctions (JJs). Previous studies have mainly
+focused on JJs whose ground states have 0 or $\pi $ superconducting phase
+difference across the junctions, while arbitrarily tunable phase JJs may have
+important applications in superconducting electronics and quantum computation.
+Here we show that a phase tunable JJ can be implemented in a spin-orbit coupled
+cold atomic gas with the magnetic tunneling barrier generated by a
+spin-dependent focused laser beam. We consider the JJ confined in either a
+linear harmonic trap or a circular ring trap. In the ring trap, the magnetic
+barrier induces a spontaneous mass current for the ground state of the JJ,
+demonstrating the magnetoelectric effects of cold atoms.",1607.02599v1
+2016-07-12,Electric octupole order in bilayer Rashba system,"The odd-parity multipole is an emergent degree of freedom, leading to
+spontaneous inversion symmetry breaking. The odd-parity multipole order may
+occur by forming staggered even-parity multipoles in a unit cell. We focus on a
+locally noncentrosymmetric bilayer Rashba system, and study an odd-parity
+electric octupole order caused by the antiferro stacking of local electric
+quadrupoles. Analyzing the forward scattering model, we show that the electric
+octupole order is stabilized by a layer-dependent Rashba spin-orbit coupling.
+The roles of the spin-orbit coupling are clarified on the basis of the analytic
+formula of multipole susceptibility. The spin texture allowed in the D_2d point
+group symmetry and its magnetic response are revealed. Furthermore, we show
+that the parity-breaking quantum critical point appears in the magnetic field.
+The possible realization of the electric octupole order in bilayer high-T_c
+cuprate superconductors is discussed.",1607.03283v3
+2016-07-22,Influence of spin-orbit coupling on the magnetic dipole term $T_α$,"The influence of the spin-orbit coupling (SOC) on the magnetic dipole term
+$T_{\alpha}$ is studied across a range of systems in order to check whether the
+$T_{\alpha}$ term can be eliminated from analysis of x-ray magnetic circular
+dichroism spectra done via the spin moment sum rule. Fully relativistic
+Korringa-Kohn-Rostoker (KKR) Green function calculations for Co monolayers and
+adatoms on Cu, Pd, Ag, Pt, and Au (111) surfaces were performed to verify
+whether the sum over magnetic dipole terms $T_{x}+T_{y}+T_{z}$ is zero and
+whether the angular dependence of the \ta\ term goes as $3\cos^{2}\theta-1$. It
+follows that there are circumstances when the influence of the SOC on
+$T_{\alpha}$ cannot be neglected even for 3$d$ atoms, where the SOC is
+nominally small. The crucial factor appears to be the dimensionality of the
+system: for 3$d$ adatoms, the influence of SOC on $T_{\alpha}$ can be
+significant while for monolayers it is always practically negligible. Apart
+from the dimensionality, hybridization between adatom and substrate states is
+also important: small hybridization enhances the importance of the SOC and vice
+versa.",1607.06596v1
+2016-09-19,Ground states of a Bose-Einstein Condensate in a one-dimensional laser-assisted optical lattice,"We study the ground-state behavior of a Bose-Einstein Condensate (BEC) in a
+Raman-laser-assisted one-dimensional (1D) optical lattice potential forming a
+multilayer system. We find that, such system can be described by an effective
+model with spin-orbit coupling (SOC) of pseudospin $(N-1)/2$, where $N$ is the
+number of layers. Due to the intricate interplay between atomic interactions,
+SOC and laser-assisted tunnelings, the ground-state phase diagrams generally
+consist of three phases -- a stripe, a plane wave and a normal phase with
+zero-momentum, touching at a quantum tricritical point. More important, even
+though the single-particle states only minimize at zero-momentum for odd $N$,
+the many-body ground states may still develop finite momenta. The underlying
+mechanisms are elucidated. Our results provide an alternative way to realize an
+effective spin-orbit coupling of Bose gas with the Raman-laser-assisted optical
+lattice, and would also be beneficial to the studies on SOC effects in spinor
+Bose systems with large spin.",1609.05955v2
+2017-03-07,Two-Dimensional Large Gap Topological Insulators with Large Rashba Spin-Orbit Coupling in Group-IV films,"Rashba spin orbit coupling in topological insulators has attracted much
+interest due to its exotic properties closely related to spintronic devices.
+The coexistence of nontrivial topology and giant Rashba splitting, however, has
+rare been observed in two-dimensional films, limiting severely its potential
+applications at room temperature. Here, we propose a series of inversion
+asymmetric group IV films, ABZ2, whose stability are confirmed by phonon
+spectrum calculations. The analyses of electronic structures reveal that they
+are intrinsic 2D TIs with a bulk gap as large as 0.74 eV, except for GeSiF2,
+SnSiCl2, GeSiCl2 and GeSiBr2 monolayers which can transform from normal to
+topological phases under appropriate tensile strains. Another prominent
+intriguing feature is the giant Rashba spin splitting with a magnitude reaching
+0.15 eV, the largest value reported in 2D films. These results present a
+platform to explore 2D TIs for room temperature device applications.",1703.02178v1
+2018-04-10,Spin-orbit coupling induced quantum droplet in ultracold Bose-Fermi mixtures,"Quantum droplets have intrigued much attention recently in view of their
+successful observations in the ultracold homonuclear atoms. In this work, we
+demonstrate a new mechanism for the formation of quantum droplet in
+heteronuclear atomic systems, i.e., by applying the synthetic spin-orbit
+coupling(SOC). Take the Bose-Fermi mixture for example, we show that by
+imposing a Rashba SOC between the spin states of fermions, the greatly
+suppressed Fermi pressure can enable the formation of Bose-Fermi droplets even
+for very weak boson-fermion attractions, which are insufficient to bound a
+droplet if without SOC. In such SOC-induced quantum droplets, the boson/fermion
+density ratio universally depends on the SOC strength, and they occur in the
+mean-field collapsing regime but with a negative fluctuation energy, distinct
+from the interaction-induced droplets found in literature. The accessibility of
+these Bose-Fermi droplets in ultracold Cs-Li and Rb-K mixtures is also
+discussed. Our results shed light on the droplet formation in a vast class of
+heteronuclear atomic systems through the manipulation of single-particle
+physics.",1804.03278v1
+2018-04-24,Rashba and Weyl spin-orbit coupling in an optical lattice clock,"Recent experimental realization of one-dimensional (1D) spin-orbit coupling
+(SOC) for ultracold alkaline-earth(-like) atoms in optical lattice clocks opens
+a new avenue for exploring exotic quantum matter because of the strongly
+suppressed heating of atoms from lasers comparing with alkaline atoms. Here we
+propose a scheme to realize two-dimensional (2D) Rashba and three-dimensional
+(3D) Weyl types of SOC in a 3D optical lattice clock and explore their
+topological phases. With 3D Weyl SOC, the system can support topological phases
+with various numbers as well as types (I or II) of Weyl points. The spin
+textures of such topological bands for 2D Rashba and 3D Weyl SOC can be
+detected using suitably designed spectroscopic sequences. Our proposal may pave
+the way for the experimental realization of robust topological quantum matters
+and their exotic quasiparticle excitations in ultracold atomic gases.",1804.09282v1
+2018-04-25,High-Field Magnetoresistance of Organic Semiconductors,"The magneto-electronic field effects in organic semiconductors at high
+magnetic fields are described by field-dependent mixing between singlet and
+triplet states of weakly bound charge carrier pairs due to small differences in
+their Land\'e g-factors that arise from the weak spin-orbit coupling in the
+material. In this work, we corroborate theoretical models for the high-field
+magnetoresistance of organic semiconductors, in particular of diodes made of
+the conducting polymer poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate)
+(PEDOT:PSS) at low temperatures, by conducting magnetoresistance measurements
+along with multi-frequency continuous-wave electrically detected magnetic
+resonance experiments. The measurements were performed on identical devices
+under similar conditions in order to independently assess the magnetic
+field-dependent spin-mixing mechanism, the so-called {\Delta}g mechanism, which
+originates from differences in the charge-carrier g-factors induced by
+spin-orbit coupling.",1804.09297v1
+2018-11-07,Two-dimensional composite solitons in a spin-orbit-coupled Fermi gas in free space,"We address a possibility of creating soliton states in oblate
+binary-fermionic clouds in the framework of the density-functional theory,
+which includes the spin-orbit coupling (SOC) and nonlinear attraction between
+spin-up and down-polarized components of the spinor wave function. In the limit
+when the inter-component attraction is much stronger than the effective
+intra-component Pauli repulsion, the resulting model also represents a system
+of Gross-Pitaevskii equations for a binary Bose-Einstein condensate including
+the SOC effect. We show that the model gives rise to two-dimensional quiescent
+composite solitons in free space. A stability region is identified for solitons
+of the mixed-mode type (which feature mixtures of zero-vorticity and vortical
+terms in both components), while solitons of the other type, semi-vortices
+(with the vorticity carried by one component) are unstable. Due to breaking of
+the Galilean invariance by SOC, the system supports moving solitons with
+velocities up to a specific critical value. Collisions between moving solitons
+are briefly considered too. The collisions lead, in particular, to a
+quasi-elastic rebound, or an inelastic outcome, which features partial merger
+of the solitons.",1811.02718v1
+2018-11-14,Topological magneto-optical effects and their quantization in noncoplanar antiferromagnets,"Reflecting the fundamental interactions of polarized light with magnetic
+matter, magneto-optical effects are well known since more than a century. The
+emergence of these phenomena is commonly attributed to the interplay between
+exchange splitting and spin-orbit coupling in the electronic structure of
+magnets. Using theoretical arguments, we demonstrate that topological
+magneto-optical effects can arise in noncoplanar antiferromagnets due to the
+finite scalar spin chirality, without any reference to exchange splitting or
+spin-orbit coupling. We propose spectral integrals of certain magneto-optical
+quantities that uncover the unique topological nature of the discovered effect.
+We also find that the Kerr and Faraday rotation angles can be quantized in
+insulating topological antiferromagnets in the low-frequency limit, owing to
+nontrivial global properties that manifest in quantum topological
+magneto-optical effects. Although the predicted topological and quantum
+topological magneto-optical effects are fundamentally distinct from
+conventional light-matter interactions, they can be measured by readily
+available experimental techniques.",1811.05803v2
+2020-07-28,Dynamical Zeeman resonance in spin-orbit-coupled spin-1 Bose gases,"We predict a dynamical resonant effect, which is driven by externally applied
+linear and quadratic Zeeman fields, in a spin-orbit-coupled spin-1
+Bose-Einstein condensate. The Bose-Einstein condensate is assumed to be
+initialized in some superposed state of Zeeman sublevels and subject to a
+sudden shift of the trapping potential. It is shown that the time-averaged
+center-of-mass oscillation and the spin polarizations of the Bose-Einstein
+condensate exhibit remarkable resonant peaks when the Zeeman fields are tuned
+to certain strengths. The underlying physics behind this resonance can be
+traced back to the out-of-phase interference of the dynamical phases carried by
+different spinorbit states. By analyzing the single particle spectrum, the
+resonant condition is summarized as a simple algebraic relation, connecting the
+strengths of the linear and quadratic Zeeman fields. This property is
+potentially applicable in quantum information and quantum precision
+measurement.",2007.14131v1
+2010-05-16,SU(2) symmetry in a Hubbard model with spin-orbit coupling,"We study the underlying symmetry in a spin-orbit coupled tight-binding model
+with Hubbard interaction. It is shown that, in the absence of the on-site
+interaction, the system possesses the SU(2) symmetry arising from the
+timereversal symmetry. The influence of the on-site interaction on the symmetry
+depends on the topology of the networks: The SU(2) symmetry is shown to be the
+spin rotation symmetry of a simply-connected lattice, so it still holds in the
+presence of the Hubbard correlation. In contrary, the on-site interaction
+breaks the SU(2) symmetry of a multi-connected lattice.",1005.2723v2
+2014-03-05,Beating dark-dark solitons and Zitterbewegung in spin-orbit coupled Bose-Einstein condensates,"We present families of beating dark-dark solitons in spin-orbit (SO) coupled
+Bose-Einstein condensates. These families consist of solitons residing
+simultaneously in the two bands of the energy spectrum. The soliton components
+are characterized by two different spatial and temporal scales, which are
+identified by a multiscale expansion method. The solitons are ""beating"" ones,
+as they perform density oscillations with a characteristic frequency, relevant
+to Zitterbewegung (ZB). We find that spin oscillations may occur, depending on
+the parity of each soliton branch, which consequently lead to ZB oscillations
+of the beating dark solitons. Analytical results are corroborated by numerical
+simulations, illustrating the robustness of the solitons.",1403.1038v2
+2016-11-07,Acceleration of spin-orbit coupled Bose-Einstein condensates: analytical description of the emergence of Landau-Zener transitions,"We analytically study the effect of gravitational and harmonic forces on
+ultra-cold atoms with synthetic spin-orbit coupling (SOC). In particular, we
+focus on the recently observed transitions between internal states induced by
+acceleration of the external modes. Our description corresponds to a
+generalized version of the Landau-Zener (LZ) model: the dimensionality is
+enlarged to combine the quantum treatment of the external variables with the
+internal-state characterization; additionally, atomic-interaction effects are
+considered. The emergence of the basic model is analytically traced. Namely, by
+using a sequence of unitary transformations and a subsequent reduction to the
+spin space, the SOC Hamiltonian, with the gravitational potential incorporated,
+is exactly converted into the primary LZ scenario. Moreover, the transitions
+induced by harmonic acceleration are approximately cast into the framework of
+the basic LZ model through a complete analytical procedure. We evaluate how the
+validity of our picture depends on the system preparation and on the magnitude
+of atomic-interaction effects. The identification of the regime of
+applicability and the rigorous characterization of the parameters of the
+effective model provide elements to control the transitions.",1611.02198v1
+2017-01-04,Raman Scattering by a Two-Dimensional Fermi Liquid with Spin-Orbit Coupling,"We present a microscopic theory of Raman scattering by a two-dimensional
+Fermi liquid (FL) with Rashba and Dresselhaus types of spin-orbit coupling, and
+subject to an in-plane magnetic field (B). In the long-wavelength limit, the
+Raman spectrum probes the collective modes of such a FL: the chiral spin waves.
+The characteristic features of these modes are a linear-in-q term in the
+dispersion and the dependence of the mode frequency on the directions of both q
+and B. All of these features have been observed in recent Raman experiments on
+CdTe quantum wells.",1701.01041v2
+2017-01-10,Induced interactions in the BCS-BEC crossover of two-dimensional Fermi gases with Rashba spin-orbit coupling,"We investigate the Gorkov--Melik-Barkhudarov (GM) correction to superfluid
+transition temperature in two-dimensional Fermi gases with Rashba spin-orbit
+coupling (SOC) across the SOC-driven BCS-BEC crossover. In the calculation of
+the induced interaction, we find that the spin-component mixing due to SOC can
+induce both of the conventional screening and additional antiscreening
+contributions that interplay significantly in the strong SOC regime. While the
+GM correction generally lowers the estimate of transition temperature, it turns
+out that at a fixed weak interaction, the correction effect exhibits a
+crossover behavior where the ratio between the estimates without and with the
+correction first decreases with SOC and then becomes insensitive to SOC when it
+goes into the strong SOC regime. We demonstrate the applicability of the GM
+correction by comparing the zero-temperature condensate fraction with the
+recent quantum Monte Carlo results.",1701.02706v2
+2017-01-11,Supercurrent Vortex Pinball via a Triplet Cooper Pair Inverse Edelstein Effect,"We consider the Josephson effect through a thin spin-orbit coupled layer in
+the presence of an exchange field, and discover a set of supercurrent vortices
+appearing in the system which can be controllably moved around in the system by
+varying either the direction of the exchange field, its strength, or the
+spin-orbit coupling magnitude via a gate voltage. We refer to this phenomenon
+as a supercurrent vortex pinball effect and show that its origin is the spin
+polarization of the triplet Cooper pairs induced in the system. The
+supercurrent vortices thus arise from what resembles a Cooper pair-induced
+inverse Edelstein effect. Our results highlight the importance of considering
+higher-dimensional models for superconducting hybrid structures which unveils
+novel phenomena that are hidden in commonly used effective 1D models.",1701.03108v2
+2017-04-01,Observation of Floquet band topology change in driven ultracold Fermi gases,"Periodic driving of a quantum system can significantly alter its energy bands
+and even change the band topology, opening a completely new avenue for
+engineering novel quantum matter. Although important progress has been made
+recently in measuring topological properties of Floquet bands in different
+systems, direct experimental measurement of Floquet band dispersions and their
+topology change is still demanding. Here we directly measure Floquet band
+dispersions in a periodically driven spin-orbit coupled ultracold Fermi gas.
+Using spin injection radio-frequency spectroscopy, we observe that the Dirac
+point originating from two dimensional spin-orbit coupling can be manipulated
+to emerge at the lowest or highest two dressed bands by fast modulating Raman
+laser frequencies, demonstrating topological change of Floquet bands. Our work
+will provide a powerful tool for understanding fundamental Floquet physics as
+well as engineering exotic topological quantum matter.",1704.00132v1
+2017-04-10,Hole weak anti-localization in a strained-Ge surface quantum well,"We report a magneto-transport study of a two-dimensional hole gas confined to
+a strained Ge quantum well grown on a relaxed Si0.2Ge0.8 virtual substrate. The
+conductivity of the hole gas measured as a function of a perpendicular magnetic
+field exhibits a zero-field peak resulting from weak anti-localization. The
+peak develops and becomes stronger upon increasing the hole density by means of
+a top gate electrode. This behavior is consistent with a Rashba-type spin-orbit
+coupling whose strength is proportional to the perpendicular electric field,
+and hence to the carrier density. By fitting the weak anti-localization peak to
+a model including a dominant cubic spin-orbit coupling, we extract the
+characteristic transport time scales and a spin splitting energy of ~1 meV.
+Finally, we observe a weak anti-localization peak also for magnetic fields
+parallel to the quantum well and attribute this finding to a combined effect of
+surface roughness, Zeeman splitting, and virtual occupation of higher-energy
+hole subbands.",1704.02879v2
+2017-04-28,Hanle model of a spin-orbit coupled Bose-Einstein condensate of excitons in semiconductor quantum wells,"We present a theoretical model of a driven-dissipative spin-orbit coupled
+Bose-Einstein condensate of indirect excitons in semiconductor quantum wells
+(QW's). Our steady-state solution of the problem shares analogies with the
+Hanle effect in an optical orientation experiment. The role of the spin pump in
+our case is played by boson stimulated scattering into the linearly-polarized
+ground state and the depolarization occurs as a result of long-range exchange
+interaction between electrons and holes. Our theory agrees with the recent
+experiment [A. A. High et al., Phys. Rev. Lett. 110, 246403 (2013)], where
+spontaneous emergence of spatial coherence and polarization texture have been
+observed. As a complementary test, we discuss a configuration where an external
+magnetic field is applied in the structure plane.",1704.08961v2
+2018-05-14,Unraveling the nature of magnetism of the 5$\boldsymbol{d^4}$ double perovskite Ba$_2$YIrO$_6$,"We report electron spin resonance (ESR) spectroscopy results on the double
+perovskite Ba$_2$YIrO$_6$. On general grounds, this material is expected to be
+nonmagnetic due to the strong coupling of the spin and orbital momenta of
+Ir$^{5+}$ (5$d^4$) ions. However, controversial experimental reports on either
+strong antiferromagnetism with static order at low temperatures or just a
+weakly paramagnetic behavior have triggered a discussion on the breakdown of
+the generally accepted scenario of the strongly spin-orbit coupled ground
+states in the 5$d^4$ iridates and the emergence of a novel exotic magnetic
+state. Our data evidence that the magnetism of the studied material is solely
+due to a few percent of Ir$^{4+}$ and Ir$^{6+}$ magnetic defects while the
+regular Ir$^{5+}$ sites remain nonmagnetic. Remarkably, the defect Ir$^{6+}$
+species manifest magnetic correlations in the ESR spectra at $T\lesssim 20$ K
+suggesting a long-range character of superexchange in the double prevoskites as
+proposed by recent theories.",1805.05243v2
+2012-01-27,Quarter-filled Kitaev-Hubbard Model: A Quantum Hall State in an Optical Lattice,"We analyze the Physics of cold atoms in honeycomb optical lattices with
+on-site repulsion and spin-orbit couplings that break time reversal symmetry.
+Such systems, at half filling and large on-site repulsion, have been proposed
+as a possible realization of the Kitaev model. The spin-orbit couplings break
+the spin degeneracy and, if strong-enough, lead to four non-overlapping bands
+in the non-interacting limit. These bands carry non-zero Chern number and
+therefore the non-interacting system has non-zero angular momentum and chiral
+edge states at 1/4 and 3/4 filling. We have investigated the effect of
+interactions using the variational cluster perturbation theory and conclude
+that the chiral edge states exist in finite range of interaction and hopping
+parameter space.",1201.5874v2
+2013-09-03,The influence of the Rashba spin-orbit coupling on the two-dimensional electron-hole system and magnetoexcitons,"In the review article the influence of the Rashba spin-orbit coupling on the
+two-dimensional electrons and holes in a strong perpendicular magnetic field is
+described in Landau gauge using the spinor-type two-component wave functions
+with different numbers of the Landau quantization levels in different spin
+projections, their difference being determined by the order of the chirality
+terms. In this representation the two-particle integral operators such as the
+electron and hole densities ${{\hat{\rho}}_{e}}(\vec{Q})$, and
+${{\hat{\rho}}_{h}}(\vec{Q})$ as well as the magnetoexciton creation and
+annihilation operators $\hat{\Psi}_{ex}^{\dagger}({{F}_{n}},\vec{k})$ and
+$\hat{\Psi}_{ex}^{{}}({{F}_{n}},\vec{k})$ in different combinations ${{F}_{n}}$
+of the electron and hole spinor states were introduced. On this base the
+Hamiltonians of the Coulomb electron-electron and electron-radiation
+interactions were deduced. The properties of the magnetoexcitons in these
+conditions were discussed.",1309.1053v1
+2013-09-19,Tuning Magnetotransport in PdPt/Y3Fe5O12: Effects of magnetic proximity and spin orbital coupling,"Anisotropic magnetoresistance (AMR) ratio and anomalous Hall conductivity
+(AHC) in PdPt/Y$_3$Fe$_5$O$_{12}$ (YIG) system are tuned significantly by spin
+orbital coupling strength $\xi$ through varying the Pt concentration. For both
+Pt/YIG and Pd/YIG, the maximal AMR ratio is located at temperatures for the
+maximal susceptibility of paramagnetic Pt and Pd metals. The AHC and ordinary
+Hall effect both change the sign with temperature for Pt-rich system and vice
+versa for Pd-rich system. The present results ambiguously evidence the spin
+polarization of Pt and Pd atoms in contact with YIG layers. The global
+curvature near the Fermi surface is suggested to change with the Pt
+concentration and temperature.",1309.4841v2
+2017-09-30,One-step treatment of spin-orbit coupling and electron correlation in large active spaces,"In this work we demonstrate that the heat bath configuration interaction
+(HCI) and its semistochastic extension can be used to treat relativistic
+effects and electron correlation on an equal footing in large active spaces to
+calculate the low energy spectrum of several systems including halogens group
+atoms (F, Cl, Br, I), coinage atoms (Cu, Au) and the Neptunyl(VI) dioxide
+radical. This work demonstrates that despite a significant increase in the size
+of the Hilbert space due to spin symmetry breaking by the spin-orbit coupling
+terms, HCI retains the ability to discard large parts of the low importance
+Hilbert space to deliver converged absolute and relative energies. For
+instance, by using just over $10^7$ determinants we get converged excitation
+energies for Au atom in an active space containing (150o,25e) which has over
+$10^{30}$ determinants. We also investigate the accuracy of five different
+two-component relativistic Hamiltonians in which different levels of
+approximations are made in deriving the one-electron and two-electrons
+Hamiltonians, ranging from Breit-Pauli (BP) to various flavors of exact
+two-component (X2C) theory. The relative accuracy of the different Hamiltonians
+are compared on systems that range in atomic number from first row atoms to
+actinides.",1710.00259v1
+2018-01-22,Finite-temperature behavior of a classical spin-orbit-coupled model for $\textrm{YbMgGaO}_4$ with and without bond disorder,"We present the results of finite-temperature classical Monte Carlo
+simulations of a strongly spin-orbit-coupled nearest-neighbor
+triangular-lattice model for the candidate $\mathrm{U}(1)$ quantum spin liquid
+$\mathrm{YbMgGaO}_4$ at large system sizes. We find a single continuous
+finite-temperature stripe-ordering transition with slowly diverging heat
+capacity that completely breaks the sixfold ground-state degeneracy, despite
+the absence of a known conformal field theory describing such a transition. We
+also simulate the effect of random-bond disorder in the model, and find that
+even weak bond disorder destroys the transition by fragmenting the system into
+very large domains -- possibly explaining the lack of observed ordering in the
+real material. The Imry-Ma argument only partially explains this fragility to
+disorder, and we extend the argument with a physical explanation for the
+preservation of our system's time-reversal symmetry even under a disorder model
+that preserves the same symmetry.",1801.06941v3
+2019-07-09,Full characterization of spin-orbit coupled photons via spatial-Stokes measurement,"Characterization and analysis of spin-orbit coupled (SOC) states, as a
+measurement problem, play a vital role in research on the modern optics and
+photonics based on structured light. Here, we demonstrate determination of
+photonic SOC states via spatial-Stokes measurement, in which two spatial
+complex probability amplitudes of spin-dependent spatial modes within SOC
+states and their relative (intramode) phase can be measured directly. Compared
+with the standard quantum-state tomography, by avoiding wavefront-flattening
+operations, the apparatus can completely record photons' realistic SOC
+structure, leading to a more accurate and precise determination of
+wavefunction. This simple and general approach for SOC state determination can
+provide a powerful toolkit for in-situ measuring photonic SOC state,
+characterizing the quality of SOC light source and associated geometric-phase
+devices.",1907.04035v1
+2020-12-18,Spin and charge order in doped spin-orbit coupled Mott insulators,"We study a two-dimensional single band Hubbard Hamiltonian with antisymmetric
+spin-orbit coupling. We argue that this is the minimal model to understand the
+electronic properties of locally non-centrosymmetric transition-metal (TM)
+oxides such as Sr$_2$IrO$_4$. Based on exact diagonalizations of small clusters
+and the random phase approximation, we investigate the correlation effects on
+charge and magnetic order as a function of doping and of the TM-oxygen-TM bond
+angle $\theta$. For small doping and $\theta$ $\lesssim$ $15^\circ$ we find
+dominant commensurate in-plane antiferromagnetic fluctuations while
+ferromagnetic fluctuations dominate for $\theta$ $\gtrsim$ $25^\circ$.
+Moderately strong nearest-neighbor Hubbard interactions can also stabilize a
+charge density wave order. Furthermore, we compare the dispersion of magnetic
+excitations for the hole-doped case to resonant inelastic X-ray scattering data
+and find good qualitative agreement.",2012.10479v1
+2017-05-29,Anisotropic electronic transport of the two-dimensional electron system in Al2O3/SrTiO3 heterostructures,"Transport measurements on the two dimensional electron system in Al2O3 SrTiO3
+heterostructures indicate significant noncrystalline anisotropic behavior below
+T = 30 K. Lattice dislocations in SrTiO3 and interfacial steps are suggested to
+be the main sources for electronic anisotropy. Anisotropic defect scattering
+likewise alters magnetoresistance at low temperature remarkably and influences
+spin-orbit coupling significantly by the Elliot Yafet mechanism of spin
+relaxation resulting in anisotropic weak localization. Applying a magnetic
+field parallel to the interface results in an additional field induced
+anisotropy of the conductance, which can be attributed to Rashba spin orbit
+interaction. Compared to LaAlO3 SrTiO3, Rashba coupling seems to be reduced
+indicating a weaker polarity in Al2O3 SrTiO3 heterostructures.",1705.10159v1
+2018-07-26,Topological crystalline insulators from stacked graphene layers,"In principle the stacking of different two-dimensional (2D) materials allows
+the construction of 3D systems with entirely new electronic properties. Here we
+propose to realize topological crystalline insulators (TCI) protected by mirror
+symmetry in heterostructures consisting of graphene monolayers separated by
+two-dimensional polar spacers. The polar spacers are arranged such that they
+can induce an alternating doping and/or spin-orbit coupling in the adjacent
+graphene sheets. When spin-orbit coupling dominates, the non-trivial phase
+arises due to the fact that each graphene sheet enters a quantum spin-Hall
+phase. Instead, when the graphene layers are electron and hole doped in an
+alternating fashion, a uniform magnetic field leads to the formation of quantum
+Hall phases with opposite Chern numbers. It thus has the remarkable property
+that unlike previously proposed and observed TCIs, the non-trivial topology is
+generated by an external time-reversal breaking perturbation.",1807.10078v2
+2018-08-14,Tuning the topological insulator states of artificial graphene,"We develop a robust, non-perturbative approach to study the band structure of
+artificial graphene. Artificial graphene, as considered here, is generated by
+imposing a superlattice structure on top of a two dimensional hole gas in a
+semiconductor heterostructure, where the hole gas naturally possesses large
+spin-orbit coupling. Via tuning of the system parameters we demonstrate how
+best to exploit the spin-orbit coupling to generate time reversal
+symmetry-protected topological insulator phases. Our major conclusion is the
+identification of a second set of topological Dirac bands in the band structure
+(with spin Chern number $C=3$), which were not reliably obtainable in previous
+perturbative approaches to artificial graphene. Importantly, the second Dirac
+bands host more desirable features than the previously studied first set of
+Dirac bands (with $C=1$). Moreover, we find that upon tuning of the system
+parameters, we can drive the system to the highly desirable regime of the
+topological flat band. We discuss the possibilities this opens up for exotic,
+strongly correlated phases.",1808.04548v1
+2018-12-03,Nontrivial Triplon Topology and Triplon Liquid in Kitaev-Heisenberg-type Excitonic Magnets,"The combination of strong spin-orbit coupling and correlations, e.g. in
+ruthenates and iridates, has been proposed as a means to realize quantum
+materials with nontrivial topological properties. We discuss here Mott
+insulators where onsite spin-orbit coupling favors a local $J_{\textrm{tot}}=0$
+singlet ground state. We investigate excitations into a low-lying triplet,
+triplons, and find them to acquire nontrivial band topology in a magnetic
+field. We also comment on magnetic states resulting from triplon condensation,
+where we find, in addition to the same ordered phases known from the
+$J_{\textrm{tot}}=\tfrac{1}{2}$ Kitaev-Heisenberg model, a triplon liquid
+taking the parameter space of Kitaev's spin liquid.",1812.00833v2
+2019-02-06,Spatiotemporal Bloch states of a spin-orbit coupled Bose-Einstein condensate in an optical lattice,"We study the spatiotemporal Bloch states of a high-frequency driven
+two-component Bose-Einstein condensate (BEC) with spin-orbit coupling (SOC) in
+an optical lattice. By adopting the rotating-wave approximation (RWA) and
+applying an exact trial-solution to the corresponding quasistationary system,
+we establish a different method for tuning SOC via external field such that the
+existence conditions of the exact particular solutions are fitted. Several
+novel features related to the exact states are demonstrated, such as SOC leads
+to spin-motion entanglement for the spatiotemporal Bloch states, SOC increases
+the population imbalance of the two-component BEC and SOC can be applied to
+manipulate the stable atomic flow which is conducive to control quantum
+transport of the BEC for different application purposes.",1902.02003v1
+2019-03-02,Topological band gap in intercalated epitaxial graphene,"Functional manipulation of graphene is an important topic in view of both
+fundamental researches and practical applications. In this study, we show that
+intercalation of 5$d$ transition metals in epitaxial graphene on SiC is a
+promising approach to realize topologically nontrivial phases with a finite
+band gap in graphene. Using first-principles calculations based on density
+functional theory, we show that the Re- and Ta-intercalated graphene become
+two-dimensional topological insulators which exhibit linear Dirac cones and
+quadratic bands with topological band gaps, respectively. The appearance of the
+topological states is attributed to the strong spin-orbit coupling strength of
+the intercalants. We find that topological edge states exist within the finite
+bulk band gap in accordance with the bulk-boundary correspondence. We also
+discuss the spin splitting of the band structure due to the inversion symmetry
+breaking and the spin-orbit coupling. Our results demonstrate that
+intercalation of graphene is an effective and viable method to manipulate the
+band gap and the topological character of graphene. Such intercalated graphene
+systems are potentially useful for spintronics and quantum computing
+applications.",1903.00591v1
+2019-03-11,Unconventional gate voltage dependence of the charge conductance caused by spin-splitting Fermi surface by Rashba-type spin-orbit coupling,"We calculate the gate voltage (Vg) dependence of charge conductance in a
+normal metal (NM)/two dimensional electron gas (2DEG) junction, where Rashba
+spin-orbit coupling and ferromagnetism exist in the 2DEG.
+  We call this 2DEG as the ferromagnetic Rashba metal (FRM) and the chemical
+potential of the FRM is controlled by Vg.
+  We clarify the physical origin of the unconventional Vg dependence of charge
+conductance in the NM/FRM junction found in our previous work [J. Phys. Soc.
+Jpn. 87, 034710 (2018)], in which the charge conductance increases with Vg,
+although the number of carries in FRM decreases.
+  We calculate the momentum-resolved charge conductance.
+  It is clarified that the origin of the unconventional Vg dependence is due to
+the non-monotonic change in the size of the inner Fermi surface in FRM as a
+function of $V_{g}$.",1903.04346v1
+2019-03-25,Stacking sensitive topological phases in a bilayer Kane-Mele-Hubbard model at quarter filling,"Layered quasi two dimensional systems have garnered huge interest both in the
+advancement of technology and in understanding emergent physics such as
+unconventional superconductivity, topological phases. In particular, the study
+of topological properties in some bilayer systems like transition metal
+chalcogenides and iridates has been the point of attraction due to
+comparatively strong spin orbit coupling of transition metal ions. In this
+paper, we analyze the topological phases induced by the interplay of electron
+correlation and spin orbit coupling in different stacking orders of bilayer
+honeycomb lattice at quarter filling. Considering the two most common stacking
+orders, AA and bernel (AB) stacking, we show that the stacking order plays a
+crucial role in the topological phase transitions of the bilayer interacting
+system. For AA stacking case, the system realizes quantum spin Hall insulator
+in the presence (absence) of time reversal symmetry and magnetically ordered
+insulator. For bernel stacking case, however, additional phases such as charge
+ordered normal insulator or Chern insulator with both charge and magnetic order
+can be stabilized. Based on our analysis, we discuss the scope of experimental
+realization in bilayers of transition metal chalcogenides.",1903.10124v1
+2019-04-03,Non-Abelian Aharonov-Casher Phase Factor in Mesoscopic Systems,"The matrix-valued Aharonov-Casher phase factor $F_{\text{AC}}$ (related to
+the c-number Aharonov-Casher phase $\lambda_{\text{AC}}$) plays an important
+role in the physics of mesoscopic systems in which spin-orbit coupling is
+relevant. Yet, its relation to experimental observables is rather elusive.
+Based on the SU(2)-gauge-invariant formulation of the Schroedinger equation, we
+relate $F_{\text{AC}}$ to measurable quantities in electronic interferometers
+subject to electric fields that generate Rashba or Dresselhaus spin-orbit
+coupling. Specifically, we consider electron transmission through (i) a
+single-channel ring interferometer and (ii) a two-channel square
+interferometer. In both examples, we derive the closed expressions of the
+conductance and show them to be simple rational functions of the traceful part
+of $F_{\text{AC}}$. In the second case, we also derive a closed expression for
+the electron spin polarization vector and find it to be a simple function of
+both the traceful and traceless parts of $F_{\text{AC}}$. This analysis then
+suggests a direct way for an experimental access to this elusive quantity.",1904.01751v1
+2020-11-09,Topological Insulators-Based Magnetic Heterostructure,"The combination of magnetism and topology in magnetic topological insulators
+(MTIs) has led to unprecedented advancements of time reversal symmetry-breaking
+topological quantum physics in the past decade. Compared with the uniform
+films, the MTI heterostructures provide a better framework to manipulate the
+spin-orbit coupling and spin properties. In this review, we summarize the
+fundamental mechanisms related to the physical orders host in
+(Bi,Sb)2(Te,Se)3-based hybrid systems. Besides, we provide an assessment on the
+general strategies to enhance the magnetic coupling and spin-orbit torque
+strength through different structural engineering approaches and effective
+interfacial interactions. Finally, we offer an outlook of MTI
+heterostructures-based spintronics applications, particularly in view of their
+feasibility to achieve room-temperature operation.",2011.04148v1
+2016-10-12,Evidence for topological proximity effect in graphene coupled to topological insulator,"The emergence of topological order in graphene is in great demand for the
+realization of quantum spin Hall states. Recently, it is theoretically proposed
+that the spin textures of surface states in topological insulator can be
+directly transferred to graphene by means of proximity effect. Here we report
+the observations of the topological proximity effect in the
+graphene-topological insulator Bi2Se3 heterojunctions via magnetotransport
+measurements. The coupling between the p_z orbitals of graphene and the p
+orbitals of surface states on the Bi2Se3 bottom surface can be enhanced by
+applying perpendicular negative magnetic field, resulting in a giant negative
+magnetoresistance at the Dirac point up to about -91%. An obvious resistivity
+dip in the transfer curve at the Dirac point is also observed in the hybrid
+devices, which is consistent with the theoretical predictions of the distorted
+Dirac bands with unique spin textures inherited from Bi2Se3 surface states.",1610.03644v1
+2016-10-18,Importance of Spin-Orbit Coupling in Organic BEDT-TTF and BEDT-TSF Salts,"We investigate the spin-orbit coupling (SOC) effects in $\alpha$- and
+$\kappa$-phase BEDT-TTF and BEDT-TSF organic salts. Contrary to the assumption
+that SOC in organics is negligible due to light C, S, H atoms, we show the
+relevance of such an interaction in a few representative cases. In the weakly
+correlated regime, SOC manifests primarily in the opening of energy gaps at
+degenerate band touching points. This effect becomes especially important for
+Dirac semimetals such as $\alpha$-(ET)$_2$I$_3$. Furthermore, in the magnetic
+insulating phase, SOC results in additional anisotropic exchange interactions,
+which provide a compelling explanation for the controversial field-induced
+behaviour of the quantum spin-liquid candidate $\kappa$-(ET)$_2$Cu$_2$(CN)$_3$.
+We conclude by discussing the importance of SOC for the description of
+low-energy properties in organics.",1610.05468v1
+2017-11-02,Entanglement and dynamical phase transition in a spin-orbit-coupled Bose-Einstein condensate,"Characterizing quantum phase transitions through quantum correlations has
+been deeply developed for a long time, while the connections between dynamical
+phase transitions (DPTs) and quantum entanglement is not yet well understood.
+In this work, we show that the time-averaged two-mode entanglement in the spin
+space reaches a maximal value when it undergoes a DPT induced by external
+perturbation in a spin-orbit-coupled Bose-Einstein condensate. We employ the
+von Neumann entropy and a correlation-based entanglement criterion as
+entanglement measures and find that both of them can infer the existence of
+DPT. While the von Neumann entropy works only for a pure state at zero
+temperature and requires state tomography to reconstruct, the experimentally
+more feasible correlation-based entanglement criterion acts as an excellent
+proxy for entropic entanglement and can determine the existence of entanglement
+for a mixed state at finite temperature, making itself an excellent indicator
+for DPT. Our work provides a deeper understanding about the connection between
+DPTs and quantum entanglement, and may allow the detection of DPT via
+entanglement become accessible as the examined criterion is suitable for
+measuring entanglement.",1711.00766v2
+2017-11-14,Single branch of chiral Majorana modes from doubly degenerate Fermi surfaces,"Majorana fermions are often proposed to be realized by first singling out one
+Fermi surface without spin degeneracy via spin-orbit coupling, and then
+imposing boundaries or defects. In this work, we take a different route
+starting with two degenerate Fermi surfaces without spin-orbit coupling, and
+show that by the method of ""kink on boundary"", the dispersive chiral Majorana
+fermions can be realized in superconducting systems with $p\pm is$ pairings.
+The surfaces of these systems develop spontaneous magnetizations whose
+directions are determined by the boundary orientations and the phase difference
+between the $p$ and $s$-component gap functions. Along the magnetic domain
+walls on the surface, there exist chiral Majorana fermions propagating
+unidirectionally, which can be conveniently dragged and controlled by external
+magnetic fields. Furthermore, the surface magnetization is shown to be a
+magnetoelectric effect based on a Ginzburg-Landau free energy analysis. We also
+discuss how to use the proximity effects to realize chiral Majorana fermions by
+performing the ""kink on boundary"" method.",1711.05241v3
+2017-11-15,Transport spectroscopy for Paschen-Back splitting of Landau levels in InAs nanowires,"The coupling of electron orbital motion and spin leads to nontrivial changes
+in energy-level structures, leading to various spectroscopies and applications.
+In atoms, such spin-orbit coupling (SOC) causes anomalous Zeeman splitting,
+known as the Paschen-Back (PB) effect, in the pres-ence of a strong magnetic
+field. In solids, SOC generates energy-band inversion or splitting, a
+prerequisite for topological phases or Majorana fermions, at zero or weak
+magnetic fields. Here, we present the first observation of PB splitting of
+Landau levels (LLs) in indium arsenide nan-owires in a strong-field regime. Our
+energy-resolved transport spectroscopy results indicated the presence of
+LL-dependent anomalous Zeeman splitting in these nanowires, analogous to the
+atomic PB effect. This result was found to be in good agreement with a
+theoretical analysis based on Rashba SOC. Our findings also suggested a way of
+generating spin-resolved electron transport in nanowires.",1711.05432v2
+2018-10-19,Ferromagnetic nodal-line metal in monolayer {\em h}-InC,"Based on first-principles calculations, we predict a new two-dimensional
+ferromagnetic material that exhibits exotic Fermi surface topology. We show
+that monolayer hexagonal indium carbide ({\em h}-InC) is thermodynamically and
+dynamically stable, and it energetically favors the ferromagnetic ordering of
+spins. The perfectly planar geometry in two dimensions, together with
+ferromagnetism, gives rise to a unique opportunity to encounter intriguing
+electronic properties, captured in the Fermi surface and band topology. We show
+that multiple nodal lines coexist in momentum space, accompanied by the
+electron and hole pockets that touch each other linearly at the nodal lines.
+Inclusion of spin-orbit coupling enriches the magnetic and electronic
+properties of {\em h}-InC. Spin-orbit coupling leads to an easy-plane type
+magnetocrystalline anisotropy, and the nodal lines can be tuned into
+topological nodal points, contingent upon the magnetization direction. Symmetry
+analysis and a tight-binding model are provided to explain the nodal structure
+of the bands. Our findings suggest {\em h}-InC as a new venue for supporting
+carbon-based magnetism and exotic band topology in two dimensions.",1810.08563v2
+2018-10-31,Theory of chiral effects in magnetic textures with spin-orbit coupling,"We present a theoretical study of two-dimensional spatially and temporally
+varying magnetic textures in the presence of spin-orbit coupling (SOC) of both
+the Rashba and Dresselhaus types. We show that the effective gauge field due to
+these SOCs, contributes to the dissipative and reactive spin torques in exactly
+the same way as in electromagnetism. Our calculations reveal that Rashba
+(Dresselhaus) SOC induces a chiral dissipation in interfacial (bulk) inversion
+asymmetric magnetic materials. Furthermore, we show that in addition to chiral
+dissipation $\alpha_c$, these SOCs also produce a chiral renormalization of the
+gyromagnetic ratio $\tilde{\gamma}_c$, and show that the latter is
+intrinsically linked to the former via a simple relation $\alpha_c =
+(\tau/\tau_{\rm ex}) \tilde{\gamma}_c$, where $\tau_{\rm ex}$ and $\tau$ are
+the exchange time and the electron relaxation time, respectively. Finally, we
+propose a theoretical scheme based on the Scattering theory to calculate and
+investigate the properties of damping in chiral magnets. Our findings should in
+principle provide a guide for material engineering of effects related to chiral
+dynamics in magnetic textures with SOC.",1810.13065v1
+2018-10-31,Spin molecular-orbit coupling and magnetic properties of the decorated honeycomb layers of Mo3S7(dmit)3 crystals,"We explore the magnetic properties of isolated a-b planes of trinuclear
+organometallic crystals, Mo3S7(dmit)3, in which an interplay of strong
+electronic correlations and spin molecular-orbital coupling (SMOC) occurs. The
+magnetic properties can be described by a XXZ+120, S=1 Heisenberg model on a
+honeycomb lattice with single-spin anisotropy, D, which depends strongly on
+SMOC. Based on ab initio estimates of SMOC in Mo3S7(dmit)3 crystals, we predict
+that the honeycomb layers of Mo3S7(dmit)3 are Neel ordered. However, in
+materials with a greater degree of magnetic frustration, Neel order can give
+way to the large-D phase.",1810.13399v1
+2019-06-17,Robust Weyl points in a 1D superlattice with transverse spin-orbit coupling,"Weyl points, synthetic magnetic monopoles in the 3D momentum space, are the
+key features of topological Weyl semimetals. The observation of Weyl points in
+ultracold atomic gases usually relies on the realization of high-dimensional
+spin-orbit coupling (SOC) for two pseudospin states (% \textit{i.e.,}
+spin-1/2), which requires complex laser configurations and precise control of
+laser parameters, thus has not been realized in experiment. Here we propose
+that robust Wely points can be realized using 1D triple-well superlattices
+(spin-1/three-band systems) with 2D transverse SOC achieved by Raman-assisted
+tunnelings. The presence of the third band is responsible to the robustness of
+the Weyl points against system parameters (e.g., Raman laser polarization,
+phase, incident angle, etc.). Different from a spin-1/2 system, the non-trivial
+topology of Weyl points in such spin-1 system is characterized by both the spin
+vector and tensor textures, which can be probed using momentum-resolved Rabi
+spectroscopy. Our proposal provides a simple yet powerful platform for
+exploring Weyl physics and related high-dimensional topological phenomena using
+high pseudospin ultracold atoms.",1906.06820v3
+2020-06-22,Spin-orbit torque induced magnetisation dynamics and switching in CoFeB/Ta/CoFeB system with mixed magnetic anisotropy,"Spin-orbit torque (SOT) induced magnetisation switching in CoFeB/Ta/CoFeB
+trilayer with two CoFeB layers exhibiting in-plane magnetic anisotropy (IPMA)
+and perpendicular magnetic anisotropy (PMA) is investigated. Interlayer
+exchange coupling (IEC), measured using ferromagnetic resonance technique is
+modified by varying thickness of Ta spacer. The evolution of the IEC leads to
+different orientation of the magnetic anisotropy axes of two CoFeB layers: for
+thicker Ta layer where magnetisation prefers antiferromagnetic ordering and for
+thinner Ta layer where ferromagnetic coupling exists. Magnetisation state of
+the CoFeB layer exhibiting PMA is controlled by the spin-polarized current
+originating from SOT in $\mu m$ sized Hall bars. The evolution of the critical
+SOT current density with Ta thickness is presented, showing an increase with
+decreasing $t_\mathrm{Ta}$, which coincides with the coercive field dependence.
+In a narrow range of $t_\mathrm{Ta}$ corresponding to the ferromagnetic IEC,
+the field-free SOT-induced switching is achieved.",2006.12068v1
+2020-09-01,Effects of Rashba-spin-orbit coupling on superconducting boron-doped nanocrystalline diamond films: evidence of interfacial triplet superconductivity,"Among the many remarkable properties of diamond, the ability to superconduct
+when heavily doped with boron has attracted much interest in the carbon
+community. When considering the nanocrystalline boron doped system, the reduced
+dimensionality and confinement effects have led to several intriguing
+observations most notably, signatures of a mixed superconducting phase. Here we
+present ultra-high-resolution transmission electron microscopy imaging of the
+grain boundary and demonstrate how the complex microstructure leads to enhanced
+carrier correlations. We observe hallmark features of spin-orbit coupling (SOC)
+manifested as the weak anti-localization effect. The enhanced SOC is believed
+to result from a combination of inversion symmetry breaking at the grain
+boundary interfaces along with antisymmetric confinement potential between
+grains, inducing a Rashba-type SOC. From a pronounced zero bias peak in the
+differential conductance, we demonstrate signatures of a triplet component
+believed to result from spin mixing caused by tunneling of singlet Cooper pairs
+through such Rashba-SOC grain boundary junctions.",2009.00475v1
+2021-01-04,NbIr$_2$B$_2$ and TaIr$_2$B$_2$ -- new low symmetry noncentrosymmetric superconductors with strong spin orbit coupling,"Superconductivity was first observed more than a century ago, but the search
+for new superconducting materials remains a challenge. The Cooper pairs in
+superconductors are ideal embodiments of quantum entanglement. Thus, novel
+superconductors can be critical for both learning about electronic systems in
+condensed matter and for possible application in future quantum technologies.
+Here two previously unreported materials, NbIr$_2$B$_2$ and TaIr$_2$B$_2$, are
+presented with superconducting transitions at 7.2 and 5.2 K, respectively. They
+display a unique noncentrosymmetric crystal structure, and for both compounds
+the magnetic field that destroys the superconductivity at 0 K exceeds one of
+the fundamental characteristics of conventional superconductors (the Pauli
+limit), suggesting that the superconductivity may be unconventional. Supporting
+this experimentally based deduction, first-principle calculations show a spin
+split Fermi surface due to the presence of strong spin-orbit coupling. These
+materials may thus provide an excellent platform for the study of non-BCS
+superconductivity in intermetallic compounds.",2101.00862v1
+2021-01-28,Spin-orbit coupling in the kagome lattice with flux and time-reversal symmetry,"We study the topological properties of a spin-orbit coupled Hofstadter model
+on the Kagome lattice. The model is time-reversal invariant and realizes a
+$\mathbb{Z}_2$ topological insulator as a result of artificial gauge fields. We
+develop topological arguments to describe this system showing three
+inequivalent sites in a unit cell and a flat band in its energy spectrum in
+addition to the topological dispersive energy bands. We show the stability of
+the topological phase towards spin-flip processes and different types of
+on-site potentials. In particular, we also address the situation where on-site
+energies may differ inside a unit cell. Moreover, a staggered potential on the
+lattice may realize topological phases for the half-filled situation. Another
+interesting result is the occurrence of a topological phase for large on-site
+energies. To describe topological properties of the system we use a numerical
+approach based on the twisted boundary conditions and we develop a mathematical
+approach, related to smooth fields.",2101.12219v2
+2021-02-26,On the conservation of the angular momentum in ultrafast spin dynamics,"The total angular momentum of a close system is a conserved quantity, which
+should remain constant in time for any excitation experiment once the pumping
+signal has extinguished. Such conservation, however, is never satisfied in
+practice in any real-time first principles description of the demagnetization
+process. Furthermore, there is a growing experimental evidence that the same
+takes place in experiments. The missing angular momentum is usually associated
+to lattice vibrations, which are not measured experimentally and are never
+considered in real-time simulations. Here we critically analyse the issue and
+conclude that current state-of-the-art simulations violate angular momentum
+conservation already at the electronic level of description. This shortcoming
+originates from an oversimplified description of the spin-orbit coupling, which
+includes atomic contributions but neglects completely that of itinerant
+electrons. We corroborate our findings with time-dependent simulations using
+model tight-binding Hamiltonians, and show that indeed such conservation can be
+re-introduced by an appropriate choice of spin-orbit coupling. The consequences
+of our findings on recent experiments are also discussed.",2102.13255v1
+2021-06-08,Tunable spin-orbit coupling in two-dimensional InSe,"We demonstrate that spin-orbit coupling (SOC) strength for electrons near the
+conduction band edge in few-layer $\gamma$-InSe films can be tuned over a wide
+range. This tunability is the result of a competition between
+film-thickness-dependent intrinsic and electric-field-induced SOC, potentially,
+allowing for electrically switchable spintronic devices. Using a hybrid
+$\mathbf{k\cdot p}$ tight-binding model, fully parameterized with the help of
+density functional theory computations, we quantify SOC strength for various
+geometries of InSe-based field-effect transistors. The theoretically computed
+SOC strengths are compared with the results of weak antilocalization
+measurements on dual-gated multilayer InSe films, interpreted in terms of
+Dyakonov-Perel spin relaxation due to SOC, showing a good agreement between
+theory and experiment.",2106.04719v1
+2021-07-03,Moiré flat Chern bands and correlated quantum anomalous Hall states generated by spin-orbit couplings in twisted homobilayer MoS$_2$,"We predict that in a twisted homobilayer of transition-metal dichalcogenide
+MoS$_2$, spin-orbit coupling in the conduction band states from $\pm K$ valleys
+can give rise to moir\'{e} flat bands with nonzero Chern numbers in each
+valley. The nontrivial band topology originates from a unique combination of
+angular twist and local mirror symmetry breaking in each individual layer,
+which results in unusual skyrmionic spin textures in momentum space with
+skyrmion number $\mathcal{S} = \pm 2$. Our Hartree-Fock analysis further
+suggests that density-density interactions generically drive the system at
+$1/2$-filling into a valley-polarized state, which realizes a correlated
+quantum anomalous Hall state with Chern number $\mathcal{C} = \pm 2$. Effects
+of displacement fields are discussed with comparison to nontrivial topology
+from layer-pseudospin magnetic fields.",2107.01328v3
+2021-07-04,Dynamics of rotating spin-orbit-coupled Bose-Einstein condensates in a quasicrystalline optical lattice,"We investigate the dynamics of rotating pseudo-spin-1/2 Bose-Einstein
+condensates (BECs) with Rashba spin-orbit coupling (SOC) in a quasicrystalline
+optical lattice (QOL). For given parameters, the system evolves from an initial
+heliciform-stripe phase into a final visible vortex necklace with a giant
+vortex and a hidden vortex necklace. Simultaneously, the corresponding spin
+texture undergoes a transition from a meron-antimeron pair to a
+half-antiskyrmion necklace. During the dynamic evolution process, the angular
+momentum increases gradually, and then approaches to a convergent value.
+Furthermore, typical quantum phases of rotating two-component BECs with SOC in
+different external potentials are summarized.",2107.01564v1
+2021-08-02,A study of all-electric electron spin resonance using Floquet quantum master equations,"We present a theoretical framework to describe experiments directed to
+controlling single-atom spin dynamics by electrical means using a scanning
+tunneling microscope. We propose a simple model consisting of a quantum
+impurity connected to electrodes where an electrical time-dependent bias is
+applied. We solve the problem in the limit of weak coupling between the
+impurity and the electrodes by means of a quantum master equation that is
+derived by the non-equilibrium Green's function formalism. We show results in
+two cases. The first case is just a single atomic orbital subjected to a
+time-dependent electric field, and the second case consists of a single atomic
+orbital coupled to a second spin-1/2. The first case reproduces the main
+experimental features Ti atoms on MgO/Ag (100) while the second one directly
+addresses the experiments on two Ti atoms. These calculations permit us to
+explore the effect of different parameters on the driving of the atomic spins
+as well as to reproduce experimental fingerprints.",2108.01011v2
+2021-09-10,Controlling magnetism through Ising superconductivity in magnetic van der Waals heterostructures,"Van der Waals heterostructures have risen as a tunable platform to combine
+different electronic orders, due to the flexibility in stacking different
+materials with competing symmetry broken states. Among them, van der Waals
+ferromagnets such as CrI3 and superconductors as NbSe2 provide a natural
+platform to engineer novel phenomena at ferromagnet-superconductor interfaces.
+In particular, NbSe2 is well known for hosting strong spin-orbit coupling
+effects that influence the properties of the superconducting state. Here we put
+forward a ferromagnet/NbSe2/ferromagnet heterostructure where the interplay
+between Ising superconductivity in NbSe2 and magnetism controls the magnetic
+alignment of the heterostructure. In particular, we show that the interplay
+between spin-orbit coupling and superconductivity allows controlling magnetic
+states in van der Waals materials. Our results show how hybrid van der Waals
+ferromagnet/superconductor heterostructure can be used as a tunable materials
+platform for superconducting spin-orbitronics.",2109.04788v2
+2021-11-17,Proximity-driven ferromagnetism and superconductivity in the triangular Rashba-Hubbard model,"Bilayer Moir\'e structures are a highly tunable laboratory to investigate the
+physics of strongly correlated electron systems. Moir\'e transition metal
+dichalcogenides at low-energies, in particular, are believed to be described by
+a single narrow band Hubbard model on a triangular lattice with spin-orbit
+coupling. Motivated by recent experimental evidence for superconductivity in
+twisted bilayer materials, we investigate the possible superconducting pairings
+in a two-dimensional single band Rashba-Hubbard model. Using a random-phase
+approximation in the presence of nearest and next-nearest neighbor hopping, we
+analyze the structure of spin fluctuations and the symmetry of the
+superconducting gap function. We show that Rashba spin-orbit coupling favors
+ferromagnetic fluctuations which strengthen triplet superconductivity. If
+parity is violated due to the absence of spatial inversion symmetry, singlet
+(d-wave) and triplet (p-wave) channels of superconductivity will be mixed.
+Moreover, we show that time-reversal symmetry can be spontaneously broken
+leading to a chiral superconducting state. Finally, we consider quasiparticle
+interference as a possible experimental technique to observe the
+superconducting gap symmetry.",2111.08931v1
+2022-01-04,Magnetic-field-induced Anderson localization in orbital selective antiferromagnet BaMn$_2$Bi$_2$,"We report a metal-insulator transition (MIT) in the half-filled multiorbital
+antiferromagnet (AF) BaMn$_2$Bi$_2$ that is tunable by a magnetic field
+perpendicular to the AF sublattices. Instead of an Anderson-Mott mechanism
+usually expected in strongly correlated systems, we find by scaling analyses
+that the MIT is driven by an Anderson localization. Electrical and
+thermoelectrical transport measurements in combination with electronic band
+calculations reveal a strong orbital-dependent correlation effect, where both
+weakly and strongly correlated $3d$-derived bands coexist with decoupled charge
+excitations. Weakly correlated holelike carriers in the $d_{xy}$-derived band
+dominate the transport properties and exhibit the Anderson localization,
+whereas other $3d$ bands show clear Mott-like behaviors with their spins
+ordered into AF sublattices. The tuning role played by the perpendicular
+magnetic field supports a strong spin-spin coupling between itinerant holelike
+carriers and the AF fluctuations, which is in sharp contrast to their weak
+charge coupling.",2201.01000v3
+2022-01-15,Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock,"Engineering a Hamiltonian system with tunable interactions provides
+opportunities to optimize performance for quantum sensing and explore emerging
+phenomena of many-body systems. An optical lattice clock based on partially
+delocalized Wannier-Stark states in a gravity-tilted shallow lattice supports
+superior quantum coherence and adjustable interactions via spin-orbit coupling,
+thus presenting a powerful spin model realization. The relative strength of the
+on-site and off-site interactions can be tuned to achieve a zero density shift
+at a `magic' lattice depth. This mechanism, together with a large number of
+atoms, enables the demonstration of the most stable atomic clock while
+minimizing a key systematic uncertainty related to atomic density. Interactions
+can also be maximized by driving off-site Wannier-Stark transitions, realizing
+a ferromagnetic to paramagnetic dynamical phase transition.",2201.05909v1
+2022-02-23,Dark Matter Direct Detection in Materials with Spin-Orbit Coupling,"Semiconductors with $\mathcal{O}(\text{meV})$ band gaps have been shown to be
+promising targets to search for sub-MeV mass dark matter (DM). In this paper we
+focus on a class of materials where such narrow band gaps arise naturally as a
+consequence of spin-orbit coupling (SOC). Specifically, we are interested in
+computing DM-electron scattering and absorption rates in these materials using
+state-of-the-art density functional theory (DFT) techniques. To do this, we
+extend the DM interaction rate calculation to include SOC effects which
+necessitates a generalization to spin-dependent wave functions. We apply our
+new formalism to calculate limits for several DM benchmark models using an
+example ZrTe$_{5}$ target and show that the inclusion of SOC can substantially
+alter projected constraints.",2202.11716v1
+2022-03-10,Interplay of charge and spin fluctuations in a Hund's coupled impurity,"In Hund's metals, the local ferromagnetic interaction between orbitals leads
+to an emergence of complex electronic states with large and slowly fluctuating
+magnetic moments. Introducing the Hund's coupled mixed valence quantum
+impurity, we gain analytic insight into recent numerical renormalization group
+studies. We show that valence fluctuations drastically impede the development
+of a large fluctuating moment over a wide range of temperatures and energy,
+characterized by quenched orbital degrees of freedom and a singular logarithmic
+behavior of the spin susceptibility $\chi_{\rm sp}''(\omega) \propto [\omega
+\ln(\omega/T_K^{\rm eff})^2]^{-1}$, closely resembling power-law scaling
+$\chi_{\rm sp}''(\omega) \sim \omega^{-\gamma}$. Such singular spin
+fluctuations are suspected to play an important role in future models of Hund's
+driven Cooper pairing.",2203.05172v3
+2022-06-28,Simulation and detection of Weyl fermions in ultracold Fermi gases with Raman-assisted spin-orbit coupling,"Weyl fermion, also referred to as pseudo-magnetic monopole in momentum space,
+is an undiscovered massless elementary particle with half-integer spin
+predicted according to relativistic quantum field theory. Motivated by the
+recent experimental observation of Weyl semimetal band in ultracold Bose gases
+with Raman-assisted 3D spin-orbit coupling, we investigate the properties and
+possible observation of Weyl fermions in the low-energy quasi-particle
+excitations of ultracold Fermi gases. Following a previous suggestion that the
+existing Raman lattice scheme can be readily generalized to fermionic systems,
+here we discuss the movement of the Weyl points in the Brillouin Zone, as well
+as the creation and annihilation of Weyl fermions by adjusting the effective
+Zeeman field. The relevant topological properties are also demonstrated by
+calculating the Chern number. Furthermore, we propose how to experimentally
+verify the existence of the Weyl fermions and the associated quantum phase
+transition via density profile measurements.",2206.13692v1
+2022-06-30,Proximity spin-orbit coupling in graphene on alloyed transition metal dichalcogenides,"The negligible intrinsic spin-orbit coupling (SOC) in graphene can be
+enhanced by proximity effects in stacked heterostructures of graphene and
+transition metal dichalcogenides (TMDCs). The composition of the TMDC layer
+plays a key role in determining the nature and strength of the resultant SOC
+induced in the graphene layer. Here, we study the evolution of the
+proximity-induced SOC as the TMDC layer is deliberately defected. Alloyed ${\rm
+G/W_{\chi}Mo_{1-\chi}Se_2}$ heterostructures with diverse compositions ($\chi$)
+and defect distributions are simulated using density functional theory.
+Comparison with continuum and tight-binding models allows both local and global
+signatures of the metal-atom alloying to be clarified. Our findings show that,
+despite some dramatic perturbation of local parameters for individual defects,
+the low-energy spin and electronic behaviour follow a simple effective medium
+model which depends only on the composition ratio of the metallic species in
+the TMDC layer. Furthermore, we demonstrate that the topological state of such
+alloyed systems can be feasibly tuned by controlling this ratio.",2206.15313v1
+2022-07-30,Bessel Vortices in Spin-Orbit-Coupled Binary Bose-Einstein Condensates with Zeeman Splitting,"We present an analysis of stationary solutions for two-dimensional (2D)
+Bose-Einstein condensates (BECs) with the Rashba spin-orbit (SO) coupling and
+Zeeman splitting. By introducing the generalized momentum operator, the linear
+version of the system can be solved exactly. The solutions are semi-vortices of
+the Bessel-vortex (BV) and modified Bessel-vortex (MBV) types, in the presence
+of the weak and strong Zeeman splitting, respectively. The ground states (GSs)
+of the full nonlinear system are constructed with the help of a specially
+designed neural network (NN). The GS of the mixed-mode type appears as
+cross-attraction interaction increases. The spin texture of the GS is produced
+in detail. It exhibits the Neel skyrmion structure for the semi-vortex GS of
+the BV type, and the respective skyrmion number is found in an analytical form.
+On the other hand, GSs of the MBV and mixed-mode types do not form skyrmions.",2208.00310v1
+2022-10-07,Evidence of linear and cubic Rashba effect in non-magnetic heterostructure,"The LaAlO3/KTaO3 system serves as a prototype to study the electronic
+properties that emerge as a result of spin-orbit coupling. In this article, we
+have used first-principles calculations to systematically study two types of
+defect-free (0 0 1) interfaces, which are termed as Type-I and Type-II. While
+the Type-I heterostructure produces a two-dimensional electron gas, the Type-II
+heterostructure hosts an oxygen-rich two-dimensional hole gas at the interface.
+Furthermore, in the presence of intrinsic spin-orbit coupling, we have found
+evidence of both cubic and linear Rashba interactions in the conduction bands
+of the Type-I heterostructure. On the contrary, there is spin-splitting of both
+the valence and the conduction bands in the Type-II interface, which are found
+to be only linear Rashba type. Interestingly, the Type-II interface also
+harbours a potential photocurrent transition path, making it an excellent
+platform to study the circularly polarized photogalvanic effect.",2210.03722v3
+2022-10-19,Dynamic structure factor of one-dimensional Fermi superfluid with spin-orbit coupling,"We theoretically calculate the density dynamic structure factor of
+one-dimensional Fermi superfluid with Raman-type spin-orbit coupling, and
+analyze its main dynamical character during phase transition between
+Bardeen-Cooper-Schrieffer superfluid and topological superfluid. Our
+theoretical results display four kinds of single-particle excitations induced
+by the two-branch structure of single-particle spectrum, and the cross
+single-particle excitation is much easier to be seen in the spin dynamic
+structure factor at a small transferred momentum. Also we find a new roton-like
+collective mode emerges at a fixed transferred momentum $q \simeq 2k_F$, and it
+only appears once the system enters the topological superfluid state. The
+occurrence of this roton-like excitation is related to switch of global minimum
+in single-particle spectrum from $k=0$ to $k \simeq 2k_F$.",2210.10407v1
+2022-11-14,Symmetric Post-Transition-State Bifurcation Reactions with Berry Pseudo-Magnetic Fields,"We investigate how the Berry force (i.e. the pseudo-magnetic force operating
+on nuclei as induced by electronic degeneracy and spin-orbit coupling (SOC))
+might modify a post-transition state bifurcation (PTSB) reaction path and
+affect product selectivity for situations when multiple products share the same
+transition state. To estimate the magnitude of this effect, Langevin dynamics
+are performed on a model system with a valley-ridge inflection (VRI) point in
+the presence of a magnetic field (that mimics the Berry curvature). We also
+develop an analytic model for such selectivity that depends on key parameters
+such as the surface topology, the magnitude of the Berry force, and the nuclear
+friction. Within this dynamical model, static electronic structure calculations
+(at the level of generalized Hartree-Fock with spin-orbit coupling (GHF+SOC)
+theory) suggest that electronic-spin induced Berry force effects may indeed
+lead to noticeable changes in methoxy radical isomerization.",2211.07731v1
+2022-12-15,Strain-induced superconductivity in Sr2IrO4,"Multi-orbital quantum materials with strong interactions can host a variety
+of novel phases. In this work we study the possibility of interaction-driven
+superconductivity in the iridate compound Sr$_2$IrO$_4$ under strain and
+doping. We find numerous regimes of strain-induced superconductivity in which
+the pairing structure depends on model parameters. Spin-fluctuation mediated
+superconductivity is modeled by a Hubbard-Kanamori model with an effective
+particle-particle interaction, calculated via the random phase approximation.
+Magnetic orders are found using the Stoner criterion. The most likely
+superconducting order we find has $d$-wave pairing, predominantly in the total
+angular momentum, $J=1/2$ states. Moreover, an $s_{\pm}$-order which mixes
+different bands is found at high Hund's coupling, and at high strain
+anisotropic $s$- and $d$-wave orders emerge. Finally, we show that in a
+fine-tuned region of parameters a spin-triplet $p$-wave order exists. The
+combination of strong spin-orbit coupling, interactions, and a sensitivity of
+the band structure to strain proves a fruitful avenue for engineering new
+quantum phases.",2212.07596v2
+2022-12-28,First-principles study of spin orbit coupling contribution to anisotropic magnetic interaction,"Anisotropic magnetic exchange interactions lead to a surprisingly rich
+variety of the magnetic properties. Considering the spin orbit coupling (SOC)
+as perturbation, we extract the general expression of a bilinear spin
+Hamiltonian, including isotropic exchange interaction, antisymmetric
+Dzyaloshinskii-Moriya (DM) interaction and symmetric $\Gamma $ term. Though it
+is commonly believed that the magnitude of the DM and $\Gamma $ interaction
+correspond to the first and second order of SOC strength $% \lambda $
+respectively, we clarify that the term proportional to $\lambda ^{2}$ also has
+contribution to DM interaction. Based on combining magnetic force theorem and
+linear-response approach, we have presented the method of calculating
+anisotropic magnetic interactions, which now has been implemented in the open
+source software WienJ. Furthermore, we introduce another method which could
+calculate the first and second order SOC contribution to the DM interaction
+separately, and overcome some shortcomings of previous methods. Our methods are
+successfully applied to several typical weak ferromagnets for $3d$, $4d$ and
+$5d$ transition metal oxides. We also predict the conditions where the DM
+interactions proportional to $\lambda $ are symmetrically forbidden while the
+DM interactions proportional to $\lambda ^{2}$ are nonzero, and believe that it
+is widespread in certain magnetic materials.",2212.13963v1
+2023-01-29,Evidence of The Anomalous Fluctuating Magnetic State by Pressure Driven 4f Valence Change in EuNiGe$_3$,"In rare-earth compounds with valence fluctuation, the proximity of the 4f
+level to the Fermi energy leads to instabilities of the charge configuration
+and the magnetic moment. Here, we provide direct experimental evidence for an
+induced magnetic polarization of the Eu$^{3+}$ atomic shell with J=0, due to
+intra-atomic exchange and spin-orbital coupling interactions with Eu$^{2+}$
+atomic shell. By applying external pressure, a transition from
+antiferromagnetic to a fluctuating behavior in a EuNiGe$_3$ single crystals is
+probed. Magnetic polarization is observed for both valence states of Eu$^{2+}$
+and Eu$^{3+}$ across the entire pressure range. The anomalous magnetism is
+discussed in terms of a homogeneous intermediate valence state where frustrated
+Dzyaloshinskii-Moriya couplings are enhanced by the onset of spin-orbital
+interaction and engender a chiral spin-liquid-like precursor.",2301.12414v1
+2023-03-15,Non-Hermitian skin effect induced by Rashba-Dresselhaus spin-orbit coupling,"1D chains with non-reciprocal tunneling realizing the non-Hermitian skin
+effect (NHSE) have attracted considerable interest in the last years whereas
+their experimental realization in real space remains limited to a few examples.
+In this work, we propose a new generic way of implementing non-reciprocity
+based on a combination of the Rashba-Dresshlauss spin-orbit coupling, existing
+for electrons, cold atoms, and photons, and a lifetime imbalance between two
+spin components. We show that one can realize the Hatano-Nelson model, the
+non-Hermitian Su-Schrieffer-Heeger model, and even observe the NHSE in a 1D
+potential well without the need for a lattice. We further demonstrate the
+practical feasibility of this proposal by considering the specific example of a
+photonic liquid crystal microcavity. This platform allows one to switch on and
+off the NHSE by applying an external voltage to the microcavity.",2303.08483v1
+2023-03-16,Magnetic Real Chern Insulator in 2D Metal-Organic Frameworks,"Real Chern insulators have attracted great interest, but so far, their
+material realization is limited to nonmagnetic crystals and to systems without
+spin-orbit coupling. Here, we reveal magnetic real Chern insulator (MRCI) state
+in a recently synthesized metal-organic framework material Co3(HITP)2. Its
+ground state with in-plane ferromagnetic ordering hosts a nontrivial real Chern
+number, enabled by the C2zT symmetry and robust against spin-orbit coupling.
+Distinct from previous nonmagnetic examples, the topological corner zero-modes
+of MRCI are spin-polarized. Furthermore, under small tensile strains, the
+material undergoes a topological phase transition from MRCI to a magnetic
+double-Weyl semimetal phase, via a pseudospin-1 critical state. Similar physics
+can also be found in closely related materials Mn3(HITP)2 and Fe3(HITP)2, which
+are also existing. Possible experimental detections and implications of an
+emerging magnetic flat band in the system are discussed.",2303.09218v1
+2023-04-01,Itinerant ferromagnetism entrenched by the anisotropy of spin-orbit coupling in a dipolar Fermi gas,"We investigate the the itinerant ferromagnetism in a dipolar Fermi atomic
+system with the anisotropic spin-orbit coupling (SOC),which is traditionally
+explored with isotropic contact interaction.We first study the ferromagnetism
+transition boundaries and the properties of the ground states through the
+density and spin-flip distribution in momentum space, and we find that both the
+anisotropy and the magnitude of the SOC play an important role in this process.
+We propose a helpful scheme and a quantum control method which can be applied
+to conquering the difficulties of previous experimental observation of
+itinerant ferromagnetism. Our further study reveals that exotic Fermi surfaces
+and an abnormal phase region can exist in this system by controlling the
+anisotropy of SOC, which can provide constructive suggestions for the research
+and the application of a dipolar Fermi gas. Furthermore, we also calculate the
+ferromagnetism transition temperature and novel distributions in momentum space
+at finite temperature beyond the ground states from the perspective of
+experiment.",2304.00286v1
+2023-04-04,Unidirectional Seebeck effect from Rashba spin-orbit coupling on the subsurface of Ge(111),"A new nonlinear magnetothermal effect, namely unidirectional Seebeck
+effect(USE), has been recently reported in magnetic/nonmagnetic topological
+insulator (TI) heterostructure and is ascribed to the asymmetry magnon
+scattering. Here, we show a new mechanism to generate USE in the Rashba two
+dimensional electron gas (2DEG), in which the magnetism or magnetic order is
+completely absent. It's found that the USE has a quantum origin from the
+spin-momentum locking generated from Rashba spin-orbit coupling. We find that
+the USE exhibits a sine dependence on the orientation of the magnetic field
+with respect to the direction of the temperature gradient and is dominant from
+the states above the Lifshitz point. The USE in the semiconductor Ge(111)
+subsurface states has been theoretically and systematically investigated.",2304.01683v1
+2023-08-03,Beyond Kitaev physics in strong spin-orbit coupled magnets,"We review the recent advances and current challenges in the field of strong
+spin-orbit coupled Kitaev materials, with a particular emphasis on the physics
+beyond the exactly-solvable Kitaev spin liquid point. To that end, we give a
+comprehensive overview of the most relevant exchange interactions in $d^5$ and
+$d^7$ iridates and similar compounds, an exposition of their microscopic
+origin, and a systematic attempt to map out the most interesting correlated
+regimes of the multi-dimensional parameter space, guided by powerful symmetry
+and duality transformations as well as by insights from wide-ranging analytical
+and numerical studies. We also survey recent exciting results on quasi-1D
+models and discuss their relevance to higher-dimensional models. Finally, we
+highlight some of the key questions in the field as well as future directions.",2308.01943v2
+2023-09-06,"Tuning flat bands by interlayer interaction, spin-orbital coupling, and external fields in twisted homotrilayer MoS$_2$","Ultraflat bands have already been detected in twisted bilayer graphene and
+twisted bilayer transition-metal dichalcogenides, which provide a platform to
+investigate strong correlations. In this paper, the electronic properties of
+twisted trilayer molybdenum disulfide (TTM) are investigated via an accurate
+tight-binding Hamiltonian. We find that the highest valence bands are derived
+from the $\Gamma$-point of the constituent monolayer, and they exhibit a
+graphenelike dispersion or become isolated flat bands that are dependent on the
+starting stacking arrangements. The lattice relaxation, local deformation, and
+external fields can significantly tune the electronic structures of TTM. After
+introducing the spin-orbital coupling effect, we find a spin-valley-layer
+locking effect at the minimum of the conduction band at the $K$- and
+$K^\prime$-point of the Brillouin zone, which may provide a platform to study
+optical properties and magnetoelectric effects.",2309.03089v2
+2023-09-12,Gravitational Radiation from Eccentric Binary Black Hole System in Dynamical Chern-Simons Gravity,"Dynamical Chern-Simons (DCS) gravity, a typical parity-violating
+gravitational theory, modifies both the generation and propagation of
+gravitational waves from general relativity (GR). In this work, we derive the
+gravitational waveform radiated from a binary black hole system with eccentric
+orbits under the spin-aligned assumption in the DCS theory. Compared with GR,
+DCS modification enters the second-order post-Newtonian (2PN) approximation,
+affecting the spin-spin coupling and monopole-quadrupole coupling of binary
+motion. This modification produces an extra precession rate of periastron. This
+effect modulates the scalar and gravitational waveform through a quite low
+frequency. Additionally, the dissipation of conserved quantities results in the
+secular evolution of the semimajor axis and the eccentricity of binary orbits.
+Finally, the frequency-domain waveform is given in the post-circular scheme,
+requiring the initial eccentricity to be $\lesssim0.3$. This ready-to-use
+template will benefit the signal searches and improve the future constraint on
+DCS theory.",2309.05991v1
+2023-10-09,Quantum anomalous Hall state in a fluorinated 1T-MoSe$_2$ monolayer,"The quantum anomalous Hall state with a large band gap and a high Chern
+number is significant for practical applications in spintronics. By performing
+first-principles calculations, we investigate electronic properties of the
+fully fluorinated 1T-MoSe$_{2}$ monolayer. Without considering the spin-orbit
+coupling, the band structure demonstrates single-spin semi-metallic properties
+and the trigonal warping around $K_{\pm}$ valleys. The introduction of the
+spin-orbit coupling opens considerable band gaps of $117.2$ meV around the two
+valleys, leading to a nontrivial quantum anomalous Hall state with a Chern
+number of $|C|=2$, which provides two chiral dissipationless transport channels
+from topological edge states and associated quantized anomalous Hall
+conductivity. In addition, an effective model is constructed to describe the
+low-energy physics of the monolayer. Our findings in the MoSe$_{2}$F$_{2}$
+monolayer sheds light on large-gap quantum anomalous Hall states in
+two-dimensional materials with the chemical functionalization, and provides
+opportunities in designing low-power and noise-tolerant spintronic devices.",2310.05356v1
+2023-10-27,Observation of Chern insulator in crystalline ABCA-tetralayer graphene with spin-orbit coupling,"Degeneracies in multilayer graphene, including spin, valley, and layer
+degrees of freedom, are susceptible to Coulomb interactions and can result into
+rich broken-symmetry states. In this work, we report a ferromagnetic state in
+charge neutral ABCA-tetralayer graphene driven by proximity-induced spin-orbit
+coupling from adjacent WSe2. The ferromagnetic state is further identified as a
+Chern insulator with Chern number of 4, and its Hall resistance reaches 78% and
+100% quantization of h/4e2 at zero and 0.4 tesla, respectively. Three
+broken-symmetry insulating states, layer-antiferromagnet, Chern insulator and
+layer-polarized insulator and their transitions can be continuously tuned by
+the vertical displacement field. Remarkably, the magnetic order of the Chern
+insulator can be switched by three knobs, including magnetic field, electrical
+doping, and vertical displacement field.",2310.17971v1
+2023-11-14,Bright solitons in a spin-orbit-coupled dipolar Bose-Einstein condensate trapped within a double-lattice,"By effectively controlling the dipole-dipole interaction, we investigate the
+characteristics of the ground state of bright solitons in a spin-orbit coupled
+dipolar Bose-Einstein condensate. The dipolar atoms are trapped within a
+double-lattice which consists of a linear and a nonlinear lattice. We derive
+the motion equations of the different spin components, taking the controlling
+mechanisms of the diolpe-dipole interaction into account. An analytical
+expression of dipole-dipole interaction is derived. By adjusting the dipole
+polarization angle, the dipole interaction can be adjusted from attraction to
+repulsion. On this basis, we study the generation and manipulation of the
+bright solitons using both the analytical variational method and numerical
+imaginary time evolution. The stability of the bright solitons is also analyzed
+and we map out the stability phase diagram. By adjusting the long-range
+dipole-dipole interaction, one can achieve manipulation of bright solitons in
+all aspects, including the existence, width, nodes, and stability. Considering
+the complexity of our system, our results will have enormous potential
+applications in quantum simulation of complex systems.",2311.08162v1
+2023-12-14,Temperature-induced supersolidity in spin-orbit-coupled Bose gases,"Close to the superfluid plane-wave (PW) - supersolid stripe (ST) phase
+transition point of a zero temperature quasi-one-dimensional spin-orbit-coupled
+Bose gas, we find that an increase in temperature induces a phase transition to
+the supersolid phase with a broken translational symmetry from the superfluid
+plane-wave phase. We use the Hartree-Fock-Bogoliubov theory with the Popov
+approximation to investigate the effect of thermal fluctuations on the
+collective excitation spectrum and investigate the softening of the spin-dipole
+mode corresponding to the shift in the quantum critical point. This is in stark
+contrast to the PW-ST phase transition in a homogeneous system where non-zero
+temperatures facilitate the melting of the stripe phase.",2312.08719v2
+2023-12-27,Correlated Quantum Phenomena of Spin-Orbit Coupled Perovskite Oxide Heterostructures: Cases of SrRuO3 and SrIrO3-Based Artificial Superlattices,"Unexpected, yet useful functionalities emerge when two or more materials
+merge coherently. Artificial oxide superlattices realize atomic and crystal
+structures that are not available in nature, thus providing controllable
+correlated quantum phenomena. This review focuses on 4d and 5d oxide
+superlattices, in which the spin-orbit coupling plays a significant role
+compared with conventional 3d oxide superlattices. Modulations in crystal
+structures with octahedral distortion, phonon engineering, electronic
+structures, spin orderings, and dimensionality control are discussed for 4d
+oxide superlattices. Atomic and magnetic structures, Jeff = 1/2 pseudospin and
+charge fluctuations, and the integration of topology and correlation are
+discussed for 5d oxide superlattices. This review provides insights into how
+correlated quantum phenomena arise from the deliberate design of superlattice
+structures that give birth to novel functionalities.",2312.16748v1
+2024-01-15,Energy-level inversion for vortex states in spin-orbit coupled Bose-Einstein condensates,"We investigate vortex states in Bose-Einstein condensates under the combined
+action of the spin-orbit coupling (SOC), gradient magnetic field, and
+harmonic-oscillator trapping potential. The linear version of the system is
+solved exactly. Through the linear-spectrum analysis, we find that, varying the
+SOC strength and magnetic-field gradient, one can perform energy-level
+inversion. With suitable parameters, initial higher-order vortex states can be
+made the ground state (GS). The nonlinear system is solved numerically,
+revealing that the results are consistent with the linear predictions in the
+case of repulsive inter-component interactions. On the other hand,
+inter-component attraction creates the GS in the form of mixed-mode states in a
+vicinity of the GS phase-transition points. The spin texture of both vortex-
+and mixed-mode GSs reveals that they feature the structure of 2D (baby)
+skyrmions.",2401.07778v1
+2024-01-21,Generation of Entangled Photons via Cooper Pair Recombination in Noncentrosymmetric Quantum Wells,"We theoretically explore the generation of entangled two-photon pairs through
+Cooper pair recombination within a noncentrosymmetric [001]-quantum well
+superconductor. Superconducting state is induced into the quantum well via
+proximity effects, and featuring an admixture of Rashba and Dresselhaus
+antisymmetric spin-orbit couplings. Our investigation highlights that the
+highest achievable purity of entangled photon pairs emerges within scenarios
+involving pure singlet Cooper pairs. Specifically, the conventional $s$-wave
+gap function within the singlet pairings achieves the highest purity levels.
+Furthermore, our findings underscore the significance of reducing spin-triplet
+pairing amplitudes to attain entangled states of superior purity. This
+reduction can be achieved by diminishing the amplitude of antisymmetric
+spin-orbit couplings. In addition to purity considerations, our study delves
+into the population of two-photon states. We observed that states featuring
+$s+p$- and $d^{}_{x^2-y^2}+p$-wave Cooper pairings exhibit the highest
+population values among the generated entangled two-photon states within a
+noncentrosymmetric superconducting quantum well.",2401.11577v1
+2024-03-26,Self-consistent quasi-particle $GW$ and hybrid functional calculations for Al/InAs/Al heterojunctions: band offset and spin-orbit coupling effects,"The electronic structure of surfaces and interfaces plays a key role in the
+properties of quantum devices. Here, we study the electronic structure of
+realistic Al/InAs/Al heterojunctions using a combination of density functional
+theory (DFT) with hybrid functionals and state-of-the-art quasi-particle $GW$
+(QS$GW$) calculations. We find a good agreement between QS$GW$ calculations and
+hybrid functional calculations which themselves compare favourably well with
+ARPES experiments. Our study confirm the need of well controlled quality of the
+interfaces to obtain the needed properties of InAs/Al heterojunctions. A
+detailed analysis of the effects of spin-orbit coupling on the spin-splitting
+of the electronic states show a linear scaling in $k$-space, related to the
+two-dimensional nature of some interface states. The good agreement by QS$GW$
+and hybrid functional calculations open the door towards trust-able use of an
+effective approximation to QS$GW$ for studying very large heterojunctions.",2403.17809v2
+2007-05-02,Topological insulators beyond the Brillouin zone via Chern parity,"The topological insulator is an electronic phase stabilized by spin-orbit
+coupling that supports propagating edge states and is not adiabatically
+connected to the ordinary insulator. In several ways it is a spin-orbit-induced
+analogue in time-reversal-invariant systems of the integer quantum Hall effect
+(IQHE). This paper studies the topological insulator phase in disordered
+two-dimensional systems, using a model graphene Hamiltonian introduced by Kane
+and Mele as an example. The nonperturbative definition of a topological
+insulator given here is distinct from previous efforts in that it involves
+boundary phase twists that couple only to charge, does not refer to edge
+states, and can be measured by pumping cycles of ordinary charge. In this
+definition, the phase of a Slater determinant of electronic states is
+determined by a Chern parity analogous to Chern number in the IQHE case.
+Numerically we find, in agreement with recent network model studies, that the
+direct transition between ordinary and topological insulators that occurs in
+band structures is a consequence of the perfect crystalline lattice.
+Generically these two phases are separated by a metallic phase, which is
+allowed in two dimensions when spin-orbit coupling is present. The same
+approach can be used to study three-dimensional topological insulators.",0705.0172v1
+2013-02-04,Inhomogeneous Fulde-Ferrell superfluidity in spin-orbit coupled atomic Fermi gases,"Inhomogeneous superfluidity lies at the heart of many intriguing phenomena in
+quantum physics. It is believed to play a central role in unconventional
+organic or heavy-fermion superconductors, chiral quark matter, and neutron star
+glitches. However, so far even the simplest form of inhomogeneous
+superfluidity, the Fulde-Ferrell (FF) pairing state with a single
+centre-of-mass momentum, is not conclusively observed due to the intrinsic
+complexibility of any realistic Fermi systems in nature. Here we theoretically
+predict that the controlled setting of ultracold fermionic atoms with synthetic
+spin-orbit coupling induced by a two-photon Raman process, demonstrated
+recently in cold-atom laboratories, provides a promising route to realize the
+long-sought FF superfluidity. At experimentally accessible low temperatures
+(i.e., $0.05T_{F}$, where $T_{F}$ is the Fermi temperature), the FF superfluid
+state dominates the phase diagram, in sharp contrast to the conventional case
+without spin-orbit coupling. We show that the finite centre-of-mass momentum
+carried by Cooper pairs is directly measurable via momentum-resolved
+radio-frequency spectroscopy. Our work opens the way to direct observation and
+characterization of inhomogeneous superfluidity.",1302.0553v2
+2013-03-11,X-ray magnetic circular dichroism experiments and theory of transuranium Laves phase compounds,"The actinide cubic Laves compounds NpAl2, NpOs2, NpFe2, and PuFe2 have been
+examined by X-ray magnetic circular dichroism (XMCD) at the actinide M4,5
+absorption edges and Os L2,3 absorption edges. The XMCD experiments performed
+at the M4,5 absorption edges of Np and Pu allow us to determine the
+spectroscopic branching ratio, which gives information on the coupling scheme
+in these materials. In all materials the intermediate coupling scheme is found
+appropriate. Comparison with the SQUID data for NpOs2 and PuFe2 allows a
+determination of the individual orbital and spin magnetic moments and the
+magnetic dipole contribution mmd. The resulting orbital and spin magnetic
+moments are in good agreement with earlier values determined by neutron
+diffraction, and the values of mmd are non-negligible, and close to those
+predicted for intermediate coupling. There is a comparatively large induced
+moment on the Os atom in NpOs2 such that the Os contribution to the total
+moment per formula unit is ~30% of the total. The spin and orbital moments at
+the Os site are parallel, in contrast to the anti-parallel configuration of Os
+impurities in 3d ferromagnetic transition metals. Calculations using the LDA+U
+technique are reported. The ab initio computed XMCD spectra show good agreement
+with experimental spectra for small values (0-1eV) of the Hubbard U parameter,
+which underpins that 5f electrons in these compounds are relatively
+delocalized.",1303.2496v1
+2014-04-21,Fate of Majorana fermions and Chern numbers after a quantum quench,"The stability of Majorana fermions at the edges of a two-dimensional
+topological supercondutor is studied, after quenches to either non-topological
+phases or other topological phases. Both instantaneous and slow quenches are
+considered. In general, the Majorana modes decay and, in the case of
+instantaneous quenches, their revival times scale to infinity as the system
+size grows. Considering fast quantum quenches within the same topological
+phase, leads, in some cases, to robust edge modes. Quenches to a topological
+$Z_2$ phase reveal some robustness of the Majorana fermions. Comparing strong
+spin-orbit coupling with weak spin-orbit coupling, it is found that the
+Majorana fermions are fairly robust, if the pairing is not aligned with the
+spin-orbit Rashba coupling. It is also shown that the Chern number remains
+invariant after the quench, until the propagation of the mode along the
+transverse direction reaches the middle point, beyond which the Chern number
+oscillates between increasing values. In some cases, the time average Chern
+number seems to converge to the appropriate value, but often the decay is very
+slow. The effect of varying the rate of change in slow quenches is also
+analysed. It is found that the defect production is non-universal and does not
+follow the Kibble-Zurek scaling with the quench rate, as obtained before for
+other systems with topological edge states.",1404.5141v1
+2014-10-03,Superfluid density and Berezinskii-Kosterlitz-Thouless transition of a spin-orbit coupled Fulde-Ferrell superfluid,"We theoretically investigate the superfluid density and
+Berezinskii-Kosterlitz-Thouless (BKT) transition of a two-dimensional Rashba
+spin-orbit coupled atomic Fermi gas with both in-plane and out-of-plane Zeeman
+fields. It was recently predicted that, by tuning the two Zeeman fields, the
+system may exhibit different exotic Fulde-Ferrell (FF) superfluid phases,
+including the gapped FF, gapless FF, gapless topological FF and gapped
+topological FF states. Due to the FF paring, we show that the superfluid
+density (tensor) of the system becomes anisotropic. When an in-plane Zeeman
+field is applied along the \textit{x}-direction, the tensor component along the
+\textit{y}-direction $n_{s,yy}$ is generally larger than $n_{s,xx}$ in most
+parameter space. At zero temperature, there is always a discontinuity jump in
+$n_{s,xx}$ as the system evolves from a gapped FF into a gapless FF state. With
+increasing temperature, such a jump is gradually washed out. The critical BKT
+temperature has been calculated as functions of the spin-orbit coupling
+strength, interatomic interaction strength, in-plane and out-of-plane Zeeman
+fields. We predict that the novel FF superfluid phases have a significant
+critical BKT temperature, typically at the order of $0.1T_{F}$, where $T_{F}$
+is the Fermi degenerate temperature. Therefore, their observation is within the
+reach of current experimental techniques in cold-atom laboratories.",1410.0987v1
+2015-01-23,Itinerant magnetism in spin-orbit coupled Bose gases,"Phases of matter are conventionally characterized by order parameters
+describing the type and degree of order in a system. For example, crystals
+consist of spatially ordered arrays of atoms, an order that is lost as the
+crystal melts. Like- wise in ferromagnets, the magnetic moments of the
+constituent particles align only below the Curie temperature, TC. These two
+examples reflect two classes of phase transitions: the melting of a crystal is
+a first-order phase transition (the crystalline order vanishes abruptly) and
+the onset of magnetism is a second- order phase transition (the magnetization
+increases continuously from zero as the temperature falls below TC). Such
+magnetism is robust in systems with localized magnetic particles, and yet rare
+in model itinerant systems where the particles are free to move about. Here for
+the first time, we explore the itinerant magnetic phases present in a spin-1
+spin-orbit coupled atomic Bose gas; in this system, itinerant ferromagnetic
+order is stabilized by the spin-orbit coupling, vanishing in its absence. We
+first located a second-order phase transition that continuously stiffens until,
+at a tricritical point, it transforms into a first- order transition (with
+observed width as small as h x 4 Hz). We then studied the long-lived metastable
+states associated with the first-order transition. These measurements are all
+in agreement with theory.",1501.05984v1
+2015-07-30,Non-adiabatic dynamics of superfluid spin-orbit coupled degenerate Fermi gas,"We study a problem of non-adiabatic superfluid dynamics of spin-orbit coupled
+neutral fermions in two spatial dimensions. We focus on the two cases when the
+out-of-equilibrium conditions are initiated either by a sudden change of the
+pairing strength or the population imbalance. For the case of zero population
+imbalance and within the mean-field approximation, the non-adiabatic evolution
+of the pairing amplitude in a collisionless regime can be found exactly by
+employing the method of Lax vector construction. Our main finding is that the
+presence of the spin-orbit coupling significantly reduces the region in the
+parameter space where a steady state with periodically oscillating pairing
+amplitude is realized. For the collisionless dynamics initiated by a sudden
+disappearance of the population imbalance we obtain an exact expression for the
+steady state pairing amplitude. In the general case of quenches to a state with
+finite population imbalance we show that there is a region in the steady state
+phase diagram where at long times the pairing amplitude dynamics is governed by
+the reduced number of the equations of motion in full analogy with exactly
+integrable case.",1507.08681v4
+2015-11-10,Topological magnetic phase in LaMnO$_3$ (111) bilayer,"Candidates for correlated topological insulators, originated from the
+spin-orbit coupling as well as Hubbard type correlation, are expected in the
+($111$) bilayer of perovskite-structural transition-metal oxides. Based on the
+first-principles calculation and tight-binding model, the electronic structure
+of a LaMnO$_3$ ($111$) bilayer sandwiched in LaScO$_3$ barriers has been
+investigated. For the ideal undistorted perovskite structure, the Fermi energy
+of LaMnO$_3$ ($111$) bilayer just stays at the Dirac point, rendering a
+semi-metal (graphene-like) which is also a half-metal (different from graphene
+nor previous studied LaNiO$_3$ ($111$) bilayer). The Dirac cone can be opened
+by the spin-orbit coupling, giving rise to nontrivial topological bands
+corresponding to the (quantized) anomalous Hall effect. For the realistic
+orthorhombic distorted lattice, the Dirac point moves with increasing Hubbard
+repulsion (or equivalent Jahn-Teller distortion). Finally, a Mott gap opens,
+establishing a phase boundary between the Mott insulator and topological
+magnetic insulator. Our calculation finds that the gap opened by spin-orbit
+coupling is much smaller in the orthorhombic distorted lattice ($\sim$$1.7$
+meV) than the undistorted one ($\sim$$11$ meV). Therefore, to suppress the
+lattice distortion can be helpful to enhance the robustness of topological
+phase in perovskite ($111$) bilayers.",1511.02968v1
+2018-05-07,Quantum depletion and superfluid density of a supersolid in Raman spin-orbit coupled Bose gases,"We theoretically investigate a three-dimensional weakly interacting Bose gas
+with one-dimensional Raman-type spin-orbit coupling at zero temperature. By
+employing an improved ansatz, including high-order harmonics in the stripe
+phase, we show that the critical transition from the stripe to the plane-wave
+phases is shifted to a relatively larger Rabi frequency compared to the
+prediction by previous work [Li $\textit{et al.}$, Phys. Rev. Lett.
+$\textbf{108}$, 225301 (2012)] using a first-order stripe ansatz. We also
+determine the quantum depletion and superfluid density over a large range of
+Rabi frequency in different phases. The depletion exhibits an intriguing
+behavior with a discontinuous jump at the transition between the stripe and
+plane-wave phases, and a maximum at the transition between the plane-wave and
+zero-momentum phases. The superfluid density is derived through a phase-twist
+method. In the plane-wave and zero-momentum phases, it is significantly
+suppressed along the spin-orbit-coupling direction and vanishes at the
+transition, consistent with a recent work [Zhang $\textit{et al.}$, Phys. Rev.
+A $\textbf{94}$, 033635 (2016)], while in the stripe phase, it smoothly
+decreases with increasing Rabi frequency. Our predictions would be useful for
+further theoretical and experimental studies of the exotic supersolid stripe
+phase.",1805.02320v2
+2015-12-10,Anderson localization of Cooper pairs and Majorana fermions in an ultracold atomic Fermi gas with synthetic spin-orbit coupling,"We theoretically investigate two-particle and many-particle Anderson
+localizations of a spin-orbit coupled ultracold atomic Fermi gas trapped in a
+quasi-periodic potential and subjected to an out-of-plane Zeeman field. We
+solve exactly the two-particle problem in a finite length system by exact
+diagonalization and solve approximately the many-particle problem within the
+mean-field Bogoliubov-de Gennes approach. At a small Zeeman field, the
+localization properties of the system are similar to that of a Fermi gas with
+conventional $s$-wave interactions. As the disorder strength increases, the
+two-particle binding energy increases and the fermionic superfluidity of many
+particles disappears above a threshold. At a large Zeeman field, where the
+interatomic interaction behaves effectively like a $p$-wave interaction, the
+binding energy decreases with increasing disorder strength and the resulting
+topological superfluidity shows a much more robust stability against disorder
+than the conventional $s$-wave superfluidity. We also analyze the localization
+properties of the emergent Majorana fermions in the topological phase. Our
+results could be experimentally examined in future cold-atom experiments, where
+the spin-orbit coupling can be induced artificially by using two Raman lasers,
+and the quasi-periodic potential can be created by using bichromatic optical
+lattices.",1512.03447v1
+2017-06-05,Quantum and thermal fluctuations in a Raman spin-orbit coupled Bose gas,"We theoretically study a three-dimensional weakly-interacting Bose gas with
+Raman-induced spin-orbit coupling at finite temperature. By employing a
+generalized Hartree-Fock-Bogoliubov theory with Popov approximation, we
+determine a complete finite-temperature phase diagram of three exotic
+condensation phases (i.e., the stripe, plane-wave and zero-momentum phases),
+against both quantum and thermal fluctuations. We find that the plane-wave
+phase is significantly broadened by thermal fluctuations. The phonon mode and
+sound velocity at the transition from the plane-wave phase to the zero-momentum
+phase are thoughtfully analyzed. At zero temperature, we find that quantum
+fluctuations open an unexpected gap in sound velocity at the phase transition,
+in stark contrast to the previous theoretical prediction of a vanishing sound
+velocity. At finite temperature, thermal fluctuations continue to significantly
+enlarge the gap, and simultaneously shift the critical minimum. For a Bose gas
+of $^{87}$Rb atoms at the typical experimental temperature, $T=0.3T_{0}$, where
+$T_{0}$ is the critical temperature of an ideal Bose gas without spin-orbit
+coupling, our results of gap opening and critical minimum shifting in the sound
+velocity, are qualitatively consistent with the recent experimental observation
+{[}S.-C. Ji \textit{et al.}, Phys. Rev. Lett. \textbf{114}, 105301 (2015){]}.",1706.01170v1
+2017-10-19,Topological Fulde-Ferrell and Larkin-Ovchinnikov states in spin-orbit coupled lattice system,"The spin-orbit coupled lattice system under Zeeman fields provides an ideal
+platform to realize exotic pairing states. Notable examples range from the
+topological superfluid/superconducting (tSC) state, which is gapped in the bulk
+but metallic at the edge, to the Fulde-Ferrell (FF) state (having a
+phase-modulated order parameter with a uniform amplitude) and the
+Larkin-Ovchinnikov (LO) state (having a spatially varying order parameter
+amplitude). Here, we show that the topological FF state with Chern number
+($\mathcal{C}=-1$) (tFF$_{1}$) and topological LO state with $\mathcal{C}=2$
+(tLO$_{2}$) can be stabilized in Rashba spin-orbit coupled lattice systems in
+the presence of both in-plane and out-of-plane Zeeman fields. Besides the
+inhomogeneous tSC states, in the presence of a weak in-plane Zeeman field, two
+topological BCS phases may emerge with $\mathcal{C}=-1$ (tBCS$_{1}$) far from
+half filling and $\mathcal{C}=2$(tBCS$_{2}$) near half filling. We show
+intriguing effects such as different spatial profiles of order parameters for
+FF and LO states, the topological evolution among inhomogeneous tSC states, and
+different non-trivial Chern numbers for the tFF$_{1}$ and tLO$_{1,2}$ states,
+which are peculiar to the lattice system. Global phase diagrams for various
+topological phases are presented for both half-filling and doped cases. The
+edge states as well as local density of states spectra are calculated for tSC
+states in a 2D strip.",1710.07169v1
+2017-12-25,Gapped topological Fulde-Ferrell-Larkin-Ovchinnikov superfluids with artificial gauge potential and weak interaction,"The topological superfluids with Majorana zero modes have not yet been
+realized in ultracold atoms with Rashba spin-orbit coupling. Here we show that
+these phases can be realized with an artificial gauge potential, which can be
+regarded as a site-dependent rotating Zeeman field. This potential breaks the
+inversion symmetry and plays the same role as Rashba spin-orbit coupling. In
+the inverted bands, this model can open a proper parameter regime for
+topological superfluids. Strikingly, we find that the interaction near the
+Fermi surface is dominated by the dispersion scattering in the same band, thus
+can realize topological phase with much weaker attractive interaction, as
+compared with the model with Rashba spin-orbit coupling. We find a large regime
+for the gapped topological Fulde-Ferrell-Larkin-Ovchinnikov superfluids and
+unveil the phase diagram with mean-field theory, which should be credible in
+the weak interaction regime. In regarding the negligible heating effect in
+realizing this potential in alkaline and rare-earth atoms, our model has the
+potential to be the first system to realize the long-sought topological FFLO
+phase and the associated Majorana zero modes.",1712.09011v1
+2020-04-02,Shock Waves in a Superfluid with Higher-Order Dispersion,"Higher-order dispersion can lead to intriguing dynamics that are becoming a
+focus of modern hydrodynamics research. Such systems occur naturally, for
+example in shallow water waves and nonlinear optics, for which several types of
+novel dispersive shocks structures have been identified. Here we introduce
+ultracold atoms as a tunable quantum simulations platform for higher-order
+systems. Degenerate quantum gases are well controlled model systems for the
+experimental study of dispersive hydrodynamics in superfluids and have been
+used to investigate phenomena such as vortices, solitons, dispersive shock
+waves and quantum turbulence. With the advent of Raman-induced spin-orbit
+coupling, the dispersion of a dilute gas Bose-Einstein condensate can be
+modified in a flexible way, allowing for detailed investigations of
+higher-order dispersion dynamics. Here we present a combined experimental and
+theoretical study of shock structures generated in such a system. The breaking
+of Galilean invariance by the spin-orbit coupling allows two different types of
+shock structures to emerge simultaneously in a single system. Numerical
+simulations suggest that the behavior of these shock structures is affected by
+interactions with vortices in a manner reminiscent of emerging viscous
+hydrodynamics due to an underlying quantum turbulence in the system. This
+result suggests that spin-orbit coupling can be used as a powerful means to tun
+the effective viscosity in cold-atom experiments serving as quantum simulators
+of turbulent hydrodynamics, with applications from condensed matter and optics
+to quantum simulations of neutron stars.",2004.00832v1
+2012-05-14,Superfluid-Insulator transition of two-species bosons with spin-orbit coupling,"Motivated by recent experiments [Y.J. Lin {\it et al.}, Nature {\bf 471}, 83
+(2011)], we study Mott phases and superfluid-insulator (SI) transitions of
+two-species ultracold bosonic atoms in a two-dimensional square optical lattice
+with nearest neighbor hopping amplitude $t$ in the presence of a spin-orbit
+coupling characterized by a tunable strength $\gamma$. Using both
+strong-coupling expansion and Gutzwiller mean-field theory, we chart out the
+phase diagrams of the bosons in the presence of such spin-orbit interaction. We
+compute the momentum distribution of the bosons in the Mott phase near the SI
+transition point and show that it displays precursor peaks whose position in
+the Brillouin zone can be varied by tuning $\gamma$. Our analysis of the
+critical theory of the transition unravels the presence of unconventional
+quantum critical points at $t/\gamma=0$ which are accompanied by emergence of
+an additional gapless mode in the critical region. We also study the superfluid
+phases of the bosons near the SI transition using a Gutzwiller mean-field
+theory which reveals the existence of a twisted superfluid phase with an
+anisotropic twist angle which depends on $\gamma$. Finally, we compute the
+collective modes of the bosons and point out the presence of reentrant SI
+transitions as a function of $\gamma$ for non-zero $t$. We propose experiments
+to test our theory.",1205.3178v2
+2019-04-28,Non-van der Waals honeycomb antiferromagnet SrRu$_2$O$_6$ down to a few layers,"The current family of experimentally realized two-dimensional magnetic
+materials consist of 3$d$ transition metals with very weak spin-orbit coupling.
+In contrast, we report a new platform in a chemically bonded and layered 4$d$
+oxide, with strong electron correlations and competing spin-orbit coupling. We
+synthesize ultra-thin sheets of SrRu$_2$O$_6$ using scalable liquid
+exfoliation. These exfoliated sheets are characterized by complementary
+experimental and theoretical techniques. The thickness of the nano-sheets
+varies between three to five monolayers, and within the first-principles
+calculations, we show that antiferromagnetism survives in these ultra-thin
+layers. Experimental data suggest that exfoliation occurs from the planes
+perpendicular to the $c$-axis as the intervening hexagonal Sr-lattice separates
+the two-dimensional magnetic honeycomb Ru-layers. The high-resolution
+transmission electron microscope images indicate that the average inter-atomic
+spacing between the Ru-layers is slightly reduced, which agrees with the
+present calculations. The signatures of rotational stacking of the nanosheets
+are also observed. Such new two-dimensional platform offers enormous
+possibilities to explore emergent properties that appear due to the interplay
+between magnetism, strong correlations and spin-orbit coupling. Moreover, these
+effects can be further tuned as a function of layer thickness.",1904.12326v2
+2015-08-04,Collective modes of a spin-orbit-coupled superfluid Fermi gas in a two-dimensional optical lattice: a comparison between the Gaussian approximation and the Bethe-Salpeter approach,"A functional integral technique and a Legendre transform are used to give a
+systematic derivation of the Schwinger-Dyson equations for the generalized
+single-particle Green's function and the Bethe-Salpeter equation for the
+two-particle Green's function and the associated collective modes of a
+population-imbalanced spin-orbit-coupled atomic Fermi gas loaded in a
+two-dimensional optical lattice at zero temperature. The collective-mode
+excitation energy is calculated within the Gaussian approximation, and from the
+Bethe-Salpeter equation in the generalized random phase approximation assuming
+the existence of a Sarma superfluid state. It is found that the Gaussian
+approximation overestimates the speed of sound of the Goldstone mode. More
+interestingly, the Gaussian approximation fails to reproduced the rotonlike
+structure of the collective-mode dispersion which appears after the linear part
+of the dispersion in the Bethe-Salpeter approach.
+  We use the Gaussian approximation and the Bethe-Salpeter approach to
+investigate the speed of sound of a balanced spin-orbit-coupled atomic Fermi
+gas near the boundary of the topological phase transition driven by an
+out-of-plane Zeeman field. It is shown that within both approaches, the minimum
+of the speed of sound is located at the topological phase transition boundary,
+and this fact can be used to confirm the existence of a topological phase
+transition.",1508.00712v2
+2017-11-18,Engineering Hybrid Epitaxial InAsSb/Al Nanowire Materials for Stronger Topological Protection,"The combination of strong spin-orbit coupling, large $g$-factors, and the
+coupling to a superconductor can be used to create a topologically protected
+state in a semiconductor nanowire. Here we report on growth and
+characterization of hybrid epitaxial InAsSb/Al nanowires, with varying
+composition and crystal structure. We find the strongest spin-orbit interaction
+at intermediate compositions in zincblende InAs$_{1-x}$Sb$_{x}$ nanowires,
+exceeding that of both InAs and InSb materials, confirming recent theoretical
+studies \cite{winkler2016topological}. We show that the epitaxial InAsSb/Al
+interfaces allows for a hard induced superconducting gap and 2$e$ transport in
+Coulomb charging experiments, similar to experiments on InAs/Al and InSb/Al
+materials, and find measurements consistent with topological phase transitions
+at low magnetic fields due to large effective $g$-factors. Finally we present a
+method to grow pure wurtzite InAsSb nanowires which are predicted to exhibit
+even stronger spin-orbit coupling than the zincblende structure.",1711.06864v2
+2020-09-22,Relation between transition density and proton inelastic scattering by $^{12}$C target at $E_p =$ 65 and 200 MeV,"We calculate proton elastic and inelastic scatterings with a microscopic
+coupled channel (MCC) calculation. The localized diagonal and coupling
+potentials including the spin-orbit part are obtained by folding a complex
+$G$-matrix effective nucleon-nucleon interaction with a transition density.
+This is the first time that the present folding prescription for the spin-orbit
+part is applied to the proton inelastic scattering, while for the monopole
+transition only. We apply the MCC calculation to the proton elastic and
+inelastic (0$^+_2$) scatterings by $^{12}$C target at $E_p$ = 65 and 200 MeV.
+The role of diagonal and coupling potentials for the central and spin-orbit
+parts is checked. In addition, the relation between the transition density and
+the proton inelastic scattering is investigated with the modified wave function
+and the modified transition density. Namely, we perform the investigation with
+the artificial drastic change rather than fine structural change. The inelastic
+cross section is sensitive to the strength and shape of the transition density,
+but the inelastic analyzing power is sensitive only to the shape of that.
+Finally, we make clear the property of the inelastic analyzing power derived
+from the transition density without an ambiguity.",2009.10841v2
+2021-03-16,Ferromagnetic helical nodal line and Kane-Mele spin-orbit coupling in kagome metal Fe3Sn2,"The two-dimensional kagome lattice hosts Dirac fermions at its Brillouin zone
+corners K and K', analogous to the honeycomb lattice. In the density functional
+theory electronic structure of ferromagnetic kagome metal Fe$_3$Sn$_2$, without
+spin-orbit coupling we identify two energetically split helical nodal lines
+winding along $z$ in the vicinity of K and K' resulting from the trigonal
+stacking of the kagome layers. We find that hopping across A-A stacking
+introduces a layer splitting in energy while that across A-B stacking controls
+the momentum space amplitude of the helical nodal lines. The effect of
+spin-orbit coupling is found to resemble that of a Kane-Mele term, where the
+nodal lines can either be fully gapped to quasi-two-dimensional massive Dirac
+fermions, or remain gapless at discrete Weyl points depending on the
+ferromagnetic moment orientation. Aside from numerically establishing
+Fe$_3$Sn$_2$ as a model Dirac kagome metal, our results provide insights into
+materials design of topological phases from the lattice point of view, where
+paradigmatic low dimensional lattice models often find realizations in
+crystalline materials with three-dimensional stacking.",2103.08803v1
+2021-06-04,Non-Loudon-Fleury Raman scattering in spin-orbit coupled Mott insulators,"We revisit the theory of magnetic Raman scattering in Mott insulators with
+strong spin-orbit coupling, with a major focus on Kitaev materials. We show
+that Kitaev materials with bond-anisotropic interactions are generally expected
+to show both one- and two-magnon responses. It is further shown that, in order
+to obtain the correct leading contributions to the Raman vertex operator
+$\mc{R}$, one must take into account the precise, photon-assisted microscopic
+hopping processes of the electrons and that, in systems with multiple hopping
+paths, $\mc{R}$ contains terms beyond those appearing in the traditional
+Loudon-Fleury theory. Most saliently, a numerical implementation of the revised
+formalism to the case of the three-dimensional hyperhoneycomb Kitaev material
+$\beta$-Li$_2$IrO$_3$ reveals that the non-Loudon-Fleury scattering terms
+actually dominate the Raman intensity. In addition, they induce a qualitative
+modification of the polarization dependence, including, e.g., the emergence of
+a sharp one-magnon peak at low energies which is not expected in the
+traditional Loudon-Fleury theory. This peak is shown to arise from microscopic
+photon-assisted tunneling processes that are of similar type with the ones
+leading to the symmetric off-diagonal interaction $\Gamma$ (known to be present
+in many Kitaev materials), but take the form of a bond-directional magnetic
+dipole term in the Raman vertex. These results are expected to apply across all
+Kitaev materials and mark a drastic change of paradigm for the understanding of
+Raman scattering in materials with strong spin-orbit coupling and multiple
+exchange paths.",2106.02645v2
+2021-08-11,Spin-orbital entangled state and realization of Kitaev physics in 3d cobalt compounds: a progress report,"The realization of Kitaev's honeycomb magnetic model in real materials has
+become one of the most pursued topics in condensed matter physics and materials
+science. If found, it is expected to host exotic quantum phases of matter and
+offers potential realizations of fault$-$tolerant quantum computations. Over
+the past years, much effort was made on 4d$-$ or 5d$-$ heavy transition metal
+compounds because of their intrinsic strong spin$-$orbit coupling. But more
+recently, there have been growing shreds of evidence that the Kitaev model
+could also be realized in 3d$-$transition metal systems with much weaker
+spin$-$orbit coupling. This review intends to serve as a guide to this
+fast$-$developing field focusing on systems with d$^7$ transition metal
+occupation. It overviews the current theoretical and experimental progress on
+realizing the Kitaev model in those systems. We examine the recent experimental
+observations of candidate materials with Co$^{2+}$ ions: e.g., CoPS$_3$,
+Na$_3$Co$_2$SbO$_6$, and Na$_2$Co$_2$TeO$_6$, followed by a brief review of
+theoretical backgrounds. We conclude this article by comparing experimental
+observations with density functional theory (DFT) calculations. We stress the
+importance of inter$-t_{2g}$ hopping channels and Hund's coupling in the
+realization of Kitaev interactions in Co$-$based compounds, which has been
+overlooked in previous studies. This review suggests future directions in the
+search for Kitaev physics in 3d cobalt compounds and beyond.",2108.05044v3
+2021-08-31,Interaction induced topological Bogoliubov excitations in a spin-orbit coupled Bose-Einstein condensate,"We study topologically non-trivial excitations of a weakly interacting,
+spin-orbit coupled Bose-Einstein condensate in a two-dimensional square optical
+lattice, a system recently realized in experiment [W. Sun et al., Phys. Rev.
+Lett. 121, 150401 (2018)]. We focus on situations where the system is not
+subjected to a Zeeman field and thus does not exhibit nontrivial
+single-particle band topology. Of special interest then is the role of particle
+interaction as well as its interplay with the symmetry properties of the system
+in producing topologically non-trivial excitations. We find that the
+non-interacting system possesses a rich set of symmetries, including the
+$\mathcal{PT}$ symmetry, the modified dihedral point group symmetry $\tilde
+D_4$ and the nonsymmorphic symmetry. These combined symmetries ensure the
+existence of pairs of degenerate Dirac points at the edge of Brillouin zone for
+the single-particle energy bands. In the presence of particle interaction and
+with sufficient spin-orbit coupling, the atoms condense in a ground state with
+net magnetization which spontaneously breaks the $\mathcal{PT}$ and $\tilde
+D_4$ symmetry. We demonstrate that this symmetry breaking leads to a gap
+opening at the Dirac point for the Bogoliubov spectrum and consequentially
+topologically non-trivial excitations. We confirm the non-trivial topology by
+calculating the Chern numbers of the lowest excitation bands and show that
+gapless edge states form at the interface of systems characterized by different
+values of the Chern number.",2108.13784v1
+2021-12-30,Non-Fermi liquid behavior in a mixed valent metallic pyrochlore iridate Pb$_2$Ir$_2$O$_{7-δ}$,"Non-Fermi liquid behavior in some fermionic systems have attracted
+significant interest in last few decades. Certain pyrochlore iridates with
+stronger spin-orbit coupling strength have recently been added to the list.
+Here, we provide evidence of such a non-Fermi liquid ground state in another
+mixed valent metallic pyrochlore iridate Pb$_2$Ir$_2$O$_{7-\delta}$, through
+the combined investigation of electronic, magnetic and thermodynamic properties
+as a function of temperature ($T$) and applied magnetic field ($H$).
+Resistivity measurement showed a linear temperature dependence down to 15~K
+below which it shows $\rho \sim T^{3/2}$ dependence while magnetic
+susceptibility diverges as $\chi$(T) $\sim$ $T^{-\alpha}$ ($\alpha < 1$) below
+10~K. While a strong negative $\Theta_{CW}$ has been observed from Curie-Weiss
+fitting, absence of any long range order down to 80~mK only indicates presence
+of strong inherent geometric frustration in the system. Heat capacity data
+showed $C_p$ $\sim$ $T\ln(T_0/T)$ + ${\beta}T^3$ dependence below 15~K down to
+1.8~K. More importantly spin-orbit coupling strength by x-ray absorption
+spectroscopy was found to be weaker in Pb$_2$Ir$_2$O$_{7-\delta}$ compared to
+other pyrochlore iridates. In absence of any large moment rare earth magnetic
+ion, Pb$_2$Ir$_2$O$_{7-\delta}$ presents a rare example of an irirdate system
+showing non-Fermi liquid behaviour due to disordered distribution of Ir$^{4+}$
+and Ir$^{5+}$ having markedly different strengths of spin-orbit coupling which
+might offer a prescription for achieving new non-Fermi liquid systems.",2112.15070v1
+2022-04-28,"Capturing the ground state of uranium dioxide from first principles: crystal distortion, magnetic structure, and phonons","Uranium dioxide (UO$_2$) remains a formidable challenge for first-principles
+approaches, due to the complex interplay among spin-orbit coupling, Mott
+physics, magnetic ordering, and crystal distortions. Here we use DFT+$U$ to
+explore UO$_2$ at zero temperature, incorporating all the aforementioned
+phenomena. The technical challenge is to navigate the many metastable
+electronic states produced by DFT+$U$, which is acomplished using $f$-orbital
+occupation matrix control to search for the ground state. We restrict our
+search to the high-symmetry ferromagnetic phase, including spin-orbit coupling,
+which produces a previously unreported occupation matrix. This newfound
+occupation matrix is then used as an initialization to explore the broken
+symmetry phases. We find the oxygen cage distortion of the 3k antiferromagnetic
+state to be in excellent agreement with experiments, and both the spin-orbit
+coupling and the Hubbard $U$ are critical ingredients. We demonstrate that only
+select phonon modes have a strong dependence on the Hubbard $U$, whereas
+magnetic ordering has only a small influence overall. We perform measurements
+of the phonon dispersion curves using inelastic neutron scattering, and our
+calculations show good agreement when using reasonable values of $U$. The
+quantitative success of DFT+$U$ warrants exploration of thermal transport and
+other observables within this level of theory.",2204.13687v3
+2022-06-27,Triple electron-electron-proton excitations and second-order approximations in nuclear-electronic orbital coupled cluster methods,"The accurate description of nuclear quantum effects, such as zero-point
+energy, is important for modeling a wide range of chemical and biological
+processes. Within the nuclear-electronic orbital (NEO) approach, such effects
+are incorporated in a computationally efficient way by treating electrons and
+select nuclei, typically protons, quantum mechanically with molecular orbital
+techniques. Herein, we implement and test a NEO coupled cluster method that
+explicitly includes the triple electron-proton excitations, where two electrons
+and one proton are excited simultaneously. Our calculations show that this
+NEO-CCSD(eep) method provides highly accurate proton densities and proton
+affinities, outperforming any previously studied NEO method. These examples
+highlight the importance of the triple electron-electron-proton excitations for
+an accurate description of nuclear quantum effects. Additionally, we also
+implement and test the second-order approximate coupled cluster with singles
+and doubles (NEO-CC2) method, as well as its scaled-opposite-spin (SOS)
+versions. The NEO-SOS$'$-CC2 method, which scales the electron-proton
+correlation energy as well as the opposite-spin and same-spin components of the
+electron-electron correlation energy, achieves nearly the same accuracy as the
+NEO-CCSD(eep) method for the properties studied. Because of its low
+computational cost, this method will enable a wide range of chemical and
+photochemical applications for large molecular systems. This work sets the
+stage for a wide range of developments and applications within the NEO
+framework.",2206.13616v1
+2022-07-08,Electron transport in quantum channels with spin-orbit interaction: Effects of the sign of the Rashba coupling and applications to nanowires,"We investigate the effects of the sign of the Rashba spin-orbit coupling
+(RSOC) on electron transmission through a single-channel Nanowire (NW) in the
+quantum coherent regime. We show that, while for a finite length NW with
+homogeneous RSOC contacted to two electrodes the sign of its RSOC does not
+affect electron transport, the situation can be quite different in the presence
+of an inhomogeneous RSOC and a magnetic field applied along the NW axis. By
+analyzing transport across an interface between two regions of different RSOC
+we find that, if the two regions have equal RSOC signs, the transmission within
+the magnetic gap energy range is almost perfect, regardless of the ratio of the
+spin-orbit energies to the Zeeman energy. In contrast, when the two regions
+have opposite RSOC signs and are Rashba-dominated, the transmission gets
+suppressed. Furthermore, we discuss the implementation on a realistic NW setup
+where two RSOC regions are realized with suitably coupled gates separated by a
+finite distance. We find that the low-temperature NW conductance exhibits a
+crossover from a short distance behavior that strongly depends on the relative
+RSOC sign of the two regions to a large distance oscillatory behavior that is
+independent of such relative sign. We are thus able to identify the conditions
+where the NW conductance mainly depends on the sign of the RSOC and the ones
+where only the RSOC magnitude matters.",2207.03773v2
+2023-08-16,Ab-initio Insights on the Fermiology of $d^1$ Transition metals in Honeycomb lattice : Hierarchy of hopping pathways and spin-orbit coupling,"Motivated by the intriguing suggestion of realizing SU(8) Dirac semi-metal
+with $J=3/2$ electrons on a honeycomb lattice, we provide a systematic study of
+the interplay of various hopping pathways and atomic spin-orbit coupling for
+the low energy electrons in candidate d$^1$ transition metal halides MX$_3$
+(M=Ti, Zr, Hf; X=F, Cl, Br). By combining first principle calculations and
+minimal hopping Hamiltonian, we uncover the role of dominant direct metal-metal
+hopping on top of indirect metal-halide-metal hopping. This sets up a hierarchy
+of hopping pathways that centrally modify the SU(8) picture for the above
+materials. These hopping interactions, along with the spin-orbit coupling, lead
+to a plethora of exactly compensated metals instead of the SU(8) Dirac
+semi-metal. Remarkably the same can be understood as descendants of a
+topological insulator obtained by gapping out the SU(8) Dirac semi-metallic
+phase. The resultant compensated metals have varied Fermi surface topology and
+are separated by Lifshitz phase transitions. We discuss the implications of the
+proximate Lifshitz transition, which may be accessed via strain, in the context
+of the relevant materials.",2308.08526v1
+2023-08-28,"Surface Hopping, Electron Translation Factors, Electron Rotation Factors, Momentum Conservation, and Size Consistency","For a system without spin-orbit coupling, the (i) nuclear plus electronic
+linear momentum and (ii) nuclear plus orbital electronic angular momentum are
+good quantum numbers. Thus, when a molecular system undergoes a nonadiabatic
+transition, there should be no change in the total linear or angular momentum.
+Now, the standard surface hopping algorithm ignores the electronic momentum and
+indirectly equates the momentum of the nuclear degrees of freedom to the total
+momentum. However, even with this simplification, the algorithm still does not
+conserve either the nuclear linear or the nuclear angular momenta. Here, we
+show that one way to address these failures is to dress the derivative
+couplings (i.e. the hopping directions) in two ways: (i) we disallow changes in
+the nuclear linear momentum by working in a translating basis (which is well
+known and leads to electron translation factors [ETFs]); and (ii) we disallow
+changes in the nuclear angular momentum by working in a basis that rotates
+around the center of mass (which is not well-known and leads to a novel,
+rotationally removable component of the derivative coupling that we will call
+electron rotation factors [ERFs] below, cf. Eq. 96). The present findings
+should be helpful in the short term as far as interpreting surface hopping
+calculations for singlet systems (without spin) and then developing new surface
+hopping algorithm in the long term for systems where one cannot ignore the
+electronic orbital and/or spin angular momentum.",2308.14621v1
+2020-07-08,Strong spin-orbit interaction and $g$-factor renormalization of hole spins in Ge/Si nanowire quantum dots,"The spin-orbit interaction lies at the heart of quantum computation with spin
+qubits, research on topologically non-trivial states, and various applications
+in spintronics. Hole spins in Ge/Si core/shell nanowires experience a
+spin-orbit interaction that has been predicted to be both strong and
+electrically tunable, making them a particularly promising platform for
+research in these fields. We experimentally determine the strength of
+spin-orbit interaction of hole spins confined to a double quantum dot in a
+Ge/Si nanowire by measuring spin-mixing transitions inside a regime of
+spin-blockaded transport. We find a remarkably short spin-orbit length of
+$\sim$65 nm, comparable to the quantum dot length and the interdot distance. We
+additionally observe a large orbital effect of the applied magnetic field on
+the hole states, resulting in a large magnetic field dependence of the
+spin-mixing transition energies. Strikingly, together with these orbital
+effects, the strong spin-orbit interaction causes a significant enhancement of
+the $g$-factor with magnetic field.The large spin-orbit interaction strength
+demonstrated is consistent with the predicted direct Rashba spin-orbit
+interaction in this material system and is expected to enable ultrafast Rabi
+oscillations of spin qubits and efficient qubit-qubit interactions, as well as
+provide a platform suitable for studying Majorana zero modes.",2007.04308v1
+2022-04-04,Inverse Orbital Torque via Spin-Orbital Entangled States,"While current-induced torque by orbital current has been experimentally found
+in various structures, evidence for its reciprocity has been missing so far.
+Here, we report experimental evidence of strong inverse orbital torque in
+YIG/Pt/CuOx (YIG = Y3Fe5O12) mediated by spin-orbital entangled electronic
+states in Pt. By injecting spin current from YIG to Pt by the spin pumping via
+ferromagnetic resonance and by the spin Seebeck effect, we find a pronounced
+inverse spin Hall effect-like signal. While a part of the signal is explained
+as due to the inverse spin-orbital Hall effect in Pt, we also find substantial
+increase of the signal in YIG/Pt/CuOx structures compared to the signal in
+YIG/Pt. We attribute this to the inverse orbital Rashba-Edelstein effect at
+Pt/CuOx interface mediated by the spin-orbital entangled states in Pt. Our work
+paves the way toward understanding of spin-orbital entangled physics in
+nonequilibrium and provides a way for electrical detection of the orbital
+current in orbitronic device applications.",2204.01825v2
+2009-07-23,Spin Currents in Semiconductor Nanostructures: A Nonequilibrium Green-Function Approach,"This chapter of ""The Oxford Handbook of Nanoscience and Technology: Frontiers
+and Advances"" reviews nonequilibrium Green function (NEGF) approach to modeling
+spin current generation, transport, and detection in semiconductor
+nanostructures containing different types of spin-orbit (SO) couplings. Its
+tutorial style--with examples drawn from the field of the spin Hall effects
+(SHEs) and with treatment of the Rashba, Dresselhaus and extrinsic SO
+couplings--offers practical recipes to compute total spin and charge currents
+flowing out of the device, as well as the nonequilibrium local spin densities
+and spin fluxes within the multiterminal nanostructure. These quantities, which
+are obtained from the knowledge of spin-resolved NEGFs that can describe both
+ballistic and diffusive transport regimes while handling phase-coherent effects
+or dephasing mechanisms relevant at room temperature, can be employed to
+understand recent experiments on all-electrical detection of mesoscopic and
+quantum SHE in complicated low-dimensional nanostructures, as well as to model
+a multitude of ""second generation"" spintronic devices exploiting coherent spin
+dynamics. The chapter also provides extensive coverage of relevant technical
+and computational details, such as: (i) the construction of retarded and lesser
+Green functions for SO-coupled nanostructures attached to many electrodes; (ii)
+computation of self-energies introduced by different types of electrodes
+attached to the central region; and (iii) accelerated algorithms for NEGF
+evaluation that make possible spin transport modeling in devices of the size
+comparable to the spin precession length (typically few hundreds of nanometers)
+that sets the scale where mesoscopic SHE effect in ballistic SO-coupled
+nanostructures is expected to reach its optimal magnitude.",0907.4122v1
+2011-07-23,Dephasing and Hyperfine Interaction in Carbon Nanotubes Double Quantum Dots: The Clean Limit,"We consider theoretically ${}^{13}$C-hyperfine interaction induced dephasing
+in carbon nanotubes double quantum dots with curvature induced spin-orbit
+coupling. For two electrons initially occupying a single dot, we calculate the
+average return probability after separation into the two dots, which have
+random nuclear-spin configurations. We focus on the long time saturation value
+of the return probability, $P_\infty$. Because of the valley degree of freedom,
+the analysis is more complex than in, for example, GaAs quantum dots, which
+have two distinct $P_\infty$ values depending on the magnetic field. Here the
+prepared state and the measured state is non-unique because two electrons in
+the same dot are allowed in six different states. Moreover, for one electron in
+each dot sixteen states exist and therefore are available for being mixed by
+the hyperfine field. The return probability experiment is found to be strongly
+dependent on the prepared state, on the external magnetic field---both Zeeman
+and orbital effects - and on the spin-orbit splitting. The lowest saturation
+value, being $P_\infty$=1/3, occurs at zero magnetic field for nanotubes with
+spin-orbit coupling and the initial state being the groundstate, this situation
+is equivalent to double dots without the valley degree of freedom. In total, we
+report nine dynamically different situations that give $P_\infty$=1/3, 3/8,
+2/5, 1/2 and for valley anti-symmetric prepared states in an axial magnetic
+field, $P_\infty$=1. When the groundstate is prepared the ratio between the
+spin-orbit splitting and the Zeeman energy due to a perpendicular magnetic
+field can tune the effective hyperfine field continuously from being three
+dimensional to two dimensional giving saturation values from $P_\infty$=1/3 to
+3/8.",1107.4710v1
+2018-08-29,Hundness versus Mottness in a three-band Hubbard-Hund model: On the origin of strong correlations in Hund metals,"Hund metals are multi-orbital systems with moderate Coulomb interaction, $U$,
+and sizeable Hund's rule coupling, $J<U$, that aligns the spins in different
+orbitals. They show strong correlation effects, like very low Fermi-liquid
+coherence scales and intriguing incoherent transport regimes, resulting in bad
+metallic behavior. But to what extent are these strong correlations governed by
+Mottness, i.e. the blocking of charge fluctuations close to a Mott insulator
+transition (MIT) induced by $U$, or by Hundness, a new route towards strong
+correlations induced by $J$? To answer this question, we study the full phase
+diagram of a degenerate three-band Hubbard-Hund model on a Bethe lattice at
+zero temperature using single-site DMFT and the numerical renormalization group
+as efficient real-frequency multi-band impurity solver. Hund metal behavior
+occurs in this minimal model for a filling close to $n_d=2$, moderate $U$ and
+sizeable $J$, the ""Hund-metal regime"", with strong correlations manifest by a
+low quasiparticle weight, $Z$. We show that ""spin-orbital separation"" (SOS) is
+a generic $J$-induced feature in the whole metallic regime of the phase diagram
+for $1<n_d<3$ and sizeable $J$: orbital screening occurs at much higher
+energies than spin screening, below which Fermi-liquid behavior sets in. The
+low $Z$ can then be explained in terms of the $J$-reduced Fermi-liquid scale.
+We further show that, in the Hund-metal regime, far from any MIT, Hundness --
+the localization of large spins -- is the key player to induce strong
+correlations. There, physical properties are governed by a broad incoherent
+energy regime of SOS with intriguing Hund metal physics: large, almost
+unscreened spins are coupled to screened orbital degrees of freedom.",1808.09936v3
+2021-09-28,Impact of Spin-Orbit Coupling on Quantum Transport in Magnetic Tunnel Junction with an anti-ferromagnetic Capping Layer,"Using first-principles calculations, we explore the role of an
+anti-ferromagnetic heavy-metal, L1$_0$-IrMn, as a capping layer in a
+perpendicular magnetic tunnel junction (\emph{p}-MTJ). A comparative study is
+conducted by employing conventional non-magnetic heavy-metals (Ta, W or Mo)
+capping layers along with an anti-ferromagnetic IrMn in a symmetric-MTJ
+X/FeCo/MgO/FeCo/X, where X=Ta, W, Mo or IrMn. Firstly, the calculations without
+including spin-orbit coupling (SOC) are presented where the highest TMR is
+achieved in IrMn-IrMn MTJ compared to that of Ta-Ta, W-W and Mo-Mo MTJs. The
+origin of this large TMR is attributed to, both, the large spin-polarization
+due to reduced lattice-mismatch and the non-identical signatures of both the
+anti-parallel conduction-channels caused by the anti-ferromagnetic ordering of
+IrMn that reflects the spins at IrMn/FeCo interface. Moreover, when SOC is
+switched-on, the increase of TMR is observed in all the MTJs with a
+particularly giant enhancement in IrMn-IrMn MTJ. This SOC-induced increase in
+TMR is ascribed to the mixed contribution of $\Delta_1$ and $\Delta_5$ states
+and the additional increase in the band levels of the out-of-plane orbitals,
+\emph{p}$_z$, \emph{d}$_{z}^2$ and \emph{d}$_{xz}$ due to the lifting of
+degeneracy. Furthermore, it was also observed that the lattice-mismatch-induced
+strain might create an orbital reconstruction within the capping layer,
+probably, due to the crystallographic deformation and, in turn, in the adjacent
+FeCo-electrode. This microscopic mechanism also plays an additional decisive
+role in enhancing the TMR. Finally, our results indicate that IrMn can offer
+giant TMR in future spin-orbit toque (SOT) based MRAM devices with a
+straightforward design strategy.",2109.13740v2
+2013-11-13,Quantum criticality in an asymmetric three-leg spin tube: A strong rung-coupling perspective,"We study quantum phase transitions in the asymmetric variation of the
+three-leg Heisenberg tube for half-odd-integer spin, with a modulation of one
+of the rung exchange couplings $J'_\perp$ while the other two are kept constant
+$J_\perp$. We focus on the strong rung-coupling regime $J_\perp \gg
+J_\parallel$, where $J_\parallel$ is the leg coupling, and analyze the
+effective spin-orbital model with a transverse crystal field in detail.
+Applying the Abelian bosonization to the effective model, we find that the
+system is in the dimer phase for the general half-odd-integer-spin cases
+without the rung modulation; the phase transition between the dimer and
+Tomonaga-Luttinger-liquid phases induced by the rung modulation is of the
+SU(2)-symmetric Berezinskii-Kosterlitz-Thouless type. Moreover, we perform a
+level spectroscopy analysis for the effective model for spin-1/2 using exact
+diagonalization, to determine the precise transition point $| J'_\perp -
+J_\perp| /J_\parallel \sim 0.283$ in the strong rung-coupling limit. The
+presence of the dimer phase in a small but finite region is also confirmed by a
+density-matrix renormalization group calculation on the original spin-tube
+model.",1311.3041v2
+2017-06-17,Electron-phonon coupling in the spin-split valence band of single layer WS$_2$,"The absence of inversion symmetry leads to a strong spin-orbit splitting of
+the upper valence band of semiconducting single layer transition metal
+dichalchogenides such as MoS$_2$ or WS$_2$. This permits a direct comparison of
+the electron-phonon coupling strength in states that only differ by their spin.
+Here, the electron-phonon coupling in the valence band maximum of single-layer
+WS$_2$ is studied by first principles calculations and angle-resolved
+photoemission. The coupling strength is found to be drastically different for
+the two spin-split branches, with calculated values of $\lambda_K=$0.0021 and
+0.40 for the upper and lower spin-split valence band of the free-standing
+layer, respectively. This difference is somewhat reduced when including
+scattering processes involving the Au(111) substrate present in the experiment
+and the experimental results confirm the strongly branch-dependent coupling
+strength.",1706.05484v1
+2009-05-19,Dynamical spin-spin correlation functions in the Kondo model out of equilibrium,"We calculate the dynamical spin-spin correlation functions of a Kondo dot
+coupled to two noninteracting leads held at different chemical potentials. To
+this end we generalize a recently developed real-time renormalization group
+method in frequency space (RTRG-FS) to allow the calculation of dynamical
+correlation functions of arbitrary dot operators in systems describing spin
+and/or orbital fluctuations. The resulting two-loop RG equations are
+analytically solved in the weak-coupling regime. This implies that the method
+can be applied provided either the voltage $V$ through the dot or the external
+magnetic field $h_0$ are sufficiently large, $\max\{V,h_0\}\gg T_K$, where the
+Kondo temperature $T_K$ is the scale where the system enters the
+strong-coupling regime. Explicitly, we calculate the longitudinal and
+transverse spin-spin correlation and response functions as well as the
+resulting fluctuation-dissipation ratios. The correlation functions in
+real-frequency space can be calculated in Matsubara space without the need of
+any analytical continuation. We obtain analytic results for the line-shape, the
+small- and large-frequency limits and several other features like the height
+and width of the peak in the transverse susceptibility at
+$\Omega\approx\tilde{h}$, where $\tilde{h}$ denotes the reduced magnetic field.
+Furthermore, we discuss how the developed method can be generalized to
+calculate dynamical correlation functions of other operators involving
+reservoir degrees of freedom as well.",0905.3095v2
+2020-01-23,Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb$_2$,"Unconventional features of relativistic Dirac/Weyl quasi-particles in
+topological materials are most evidently manifested in the 2D quantum Hall
+effect (QHE), whose variety is further enriched by their spin and/or valley
+polarization. Although its extension to three dimensions has been long-sought
+and inspired theoretical proposals, material candidates have been lacking. Here
+we have discovered valley-contrasting spin-polarized Dirac fermions in a
+multilayer form in bulk antiferromagnet BaMnSb$_2$, where the out-of-plane
+Zeeman-type spin splitting is induced by the in-plane inversion symmetry
+breaking and spin-orbit coupling (SOC) in the distorted Sb square net.
+Furthermore, we have observed well-defined quantized Hall plateaus together
+with vanishing interlayer conductivity at low temperatures as a hallmark of the
+half-integer QHE in a bulk form. The Hall conductance of each layer is found to
+be nearly quantized to $2(N+1/2)e^2/h$ with $N$ being the Landau index, which
+is consistent with two spin-polarized Dirac valleys protected by the strong
+spin-valley coupling.",2001.08683v1
+2018-06-18,The family of topological Hall effects for electrons in skyrmion crystals,"Hall effects of electrons can be produced by an external magnetic field, spin
+orbit-coupling or a topologically non-trivial spin texture. The topological
+Hall effect (THE) - caused by the latter - is commonly observed in magnetic
+skyrmion crystals. Here, we show analogies of the THE to the conventional Hall
+effect (HE), the anomalous Hall effect (AHE), and the spin Hall effect (SHE).
+In the limit of strong coupling between conduction electron spins and the local
+magnetic texture the THE can be described by means of a fictitious, 'emergent'
+magnetic field. In this sense the THE can be mapped onto the HE caused by an
+external magnetic field. Due to complete alignment of electron spin and
+magnetic texture, the transverse charge conductivity is linked to a transverse
+spin conductivity. They are disconnected for weak coupling of electron spin and
+magnetic texture; the THE is then related to the AHE. The topological
+equivalent to the SHE can be found in antiferromagnetic skyrmion crystals. We
+substantiate our claims by calculations of the edge states for a finite sample.
+These states reveal in which situation the topological analogue to a quantized
+HE, quantized AHE, and quantized SHE can be found.",1806.06958v1
+2018-07-30,Observation of Quantum Interference and Coherent Control in a Photochemical Reaction,"Coherent control of reactants remains a longstanding challenge in quantum
+chemistry. In particular, we have studied laser-induced molecular formation
+(photoassociation) in a Raman-dressed spin-orbit-coupled 87Rb Bose-Einstein
+condensate, whose spin quantum state is a superposition of multiple bare spin
+components. In contrast to the notably different photoassociation-induced
+fractional atom losses observed for the bare spin components of a statistical
+mixture, a superposition state with a comparable spin composition displays the
+same fractional loss on every spin component. We interpret this as the
+superposition state itself undergoing photoassociation. For superposition
+states induced by a large Raman coupling and zero Raman detuning, we observe a
+nearly complete suppression of the photoassociation rate. This suppression is
+consistent with a model based upon quantum destructive interference between two
+photoassociation pathways for colliding atoms with different spin combinations.
+This model also explains the measured dependence of the photoassociation rate
+on the Raman detuning at a moderate Raman coupling. Our work thus suggests that
+preparing atoms in quantum superpositions may represent a powerful new
+technique to coherently control photochemical reactions.",1807.11608v3
+2021-11-01,Magnon-phonon coupling from a crossing symmetric screened interaction,"The magnon-phonon coupling has received growing attention in recent years due
+to its central role in spin caloritronics and the emerging field of acoustic
+spintronics. At resonance, this magnetoelastic interaction drives the formation
+of magnon polarons, which underpin exotic phenomena such as magnonic heat
+currents and phononic spin, but has with a few recent exceptions only been
+investigated using mesoscopic spin-lattice models. Motivated to integrate the
+magnon-phonon coupling into first-principle many-body electronic structure
+theory, we set up to derive the non-relativistic exchange-contribution, which
+is more subtle than the spin-orbit contribution, using Schwinger's method of
+functional derivatives. To avoid having to solve the famous Hedin-Baym
+equations self-consistently, the phonons are treated as a perturbation to the
+electronic structure. A formalism is developed around the idea of imposing
+crossing symmetry on the interaction, in order to treat charge and spin on
+equal footing. By an iterative scheme, we find that the spin-flip component of
+the ${\mathit collective}$ four-point interaction, $\mathcal{V}$, which is used
+to calculate the magnon spectrum, contains a first-order ""screened T matrix""
+part and an arguably more important second-order part, which in the limit of
+local spins describes the same processes of phonon emission and absorption as
+obtained from phenomenological magnetoelastic models. Here, the ""order"" refers
+to the ${\mathit screened}$ ${\mathit collective}$ four-point interaction,
+$\mathcal{W}$ - the crossing-symmetric analog of Hedin's $W$.
+Proof-of-principle model calculations are performed at varying temperatures for
+the isotropic magnon spectrum in three dimensions in the presence of a flat
+optical phonon branch.",2111.00908v1
+2010-11-15,Orbital fluctuations and orbital order below the Jahn-Teller transition in Sr3Cr2O8,"We report on the magnetic and phononic excitation spectrum of Sr3Cr2O8
+determined by THz and infrared (IR) spectroscopy, and electron spin resonance
+(ESR) measurements across the Jahn-Teller transition, which is detected by
+specific-heat measurements to occur at T_{JT} = 285 K. We identify the
+singlet-triplet excitations in the dimerized ground state and estimate the
+exchange couplings in the system. Moreover, ESR absorptions were observed up to
+T* = 120 K with a linewidth proportional to exp{-Delta/k_{B}T} and Delta/k_{B}
+= 388 K indicating a phonon-mediated spin relaxation via the excited orbital
+state of the Cr $e$ doublet in the orbitally ordered state. In contrast to the
+expected drastic change of the IR active phonons upon entering the low-symmetry
+Jahn-Teller distorted phase below T_{JT}, we find an extended regime
+T*<T<T_{JT} where the IR active phonons change only gradually with decreasing
+temperature. This regime is associated with strong fluctuations in the orbital
+and lattice degrees of freedom in agreement with the loss of the ESR signal
+above T*. Using the measured magnetic and phononic excitation spectrum we model
+the orbital contribution to the specific heat and find the persistence of
+strong fluctuations far below T_{JT}.",1011.3314v3
+2019-03-12,Atomic-Scale Magnetic Toroidal Dipole under Odd-Parity Hybridization,"Magnetic toroidal dipole (MTD) is one of a fundamental constituent to induce
+magneto-electric effects in the absence of both spatial inversion and
+time-reversal symmetries. We report on a microscopic investigation of the
+atomic-scale MTD in solids by taking into account the orbital degree of freedom
+with a different parity. We construct an effective two-orbital $d$-$f$
+tight-binding model on a polar tetragonal system for describing the
+atomic-scale MTD, which are obtained by incorporating the atomic spin-orbit
+coupling and odd-parity hybridization. The effective model exhibits two types
+of the MTDs: in-plane $x, y$ components activated through spontaneous
+ferromagnetic ordering or external magnetic field and an out-of-plane $z$
+component by a spontaneous odd-parity hybridization without spin moments. We
+show that the intra-orbital (inter-orbital) Coulomb interaction in
+multi-orbital systems plays an important role in stabilizing the in-plane
+(out-of-plane) MTD orderings. We also examine the magneto-electric effect under
+each MTD ordering by calculating a linear response tensor. We show that the
+odd-parity hybridization enhances the magneto-electric effect for the in-plane
+MTDs, while it suppresses that for the out-of-plane MTD.",1903.04708v1
+2021-08-10,The orbital effect on the anomalous magnetism and evolution in La$_x$Y$_{1-x}$VO$_3$($0\le x \le 0.2$) single crystals,"The orbital effect on the anomalous magnetism and evolution of low La-doping
+single crystals, La$_x$Y$_{1-x}$VO$_{3}$ (x = 0, 0.1, and 0.2), has been
+investigated by applying the X-ray diffraction, specific heat, magnetization
+and Raman scattering techniques. The larger nearest-neighbor (NN) exchange
+interaction along c-axis stabilizes the fluctuant G-type orbital ordering
+(G-OO) which favors the exotic C-type antiferromagnetic order (C-AF). It is
+found that the NN exchange interaction in ab plane is anisotropy relating to
+the in plane magnetic anisotropy, which becomes smaller in high La-doped
+sample. Most interestingly, with increasing the La$^{3+}$ content the orbital
+fluctuation and hybridization are decreased which stabilizes the C-OO phase and
+destabilizes the G-OO phase. Meanwhile, the diamagnetism in the exotic C-AF
+phase becomes weak and the possible mechanism relates to the change of the
+competition between the single-ion magnetic anisotropy and the
+Dzyaloshinsky-Moriya (DM) interaction with increasing x. Finally, the strong
+spin-orbital coupling has been observed at temperature just above T$_N$ in
+La$_{0.2}$Y$_{0.8}$VO$_{3}$ and a short range spin-orbital correlation is
+suggested.",2108.04648v1
+2022-06-10,"J = 0 nonmagnetic insulating state in K$_2$Os$X_6$ (X = F, Cl and Br)","In $4d/5d$ transition-metal systems, many interesting physical properties
+arise from the interplay of bandwidth, electronic correlations, and spin-orbit
+interactions. Here, using {\it ab initio} density functional theory, we
+systematically study the double-perovskite-like system K$_2$Os$X_6$ (X = F, Cl,
+and Br) with a $5d^4$ electronic configuration. Our main result is that the $J
+= 0$ nonmagnetic insulating state develops in this system, induced by strong
+spin-orbital coupling. Specifically, the well-separated Os$X_6$ octahedra lead
+to the cubic crystal-field limit and result in dramatically decreasing hoppings
+in nearest neighbor Os-Os sites. In this case, the three degenerate $t_{2g}$
+orbitals are reconstructed into two ``effective'' $j_{\rm eff}$ ($j_{\rm eff} =
+1/2$ and $j_{\rm eff} = 3/2$ states) states separated by the strong SOC,
+opening a gap with four electrons occupying the $j_{\rm eff} = 3/2$ orbitals.
+Furthermore, the hybridization between the Os $5d$ orbitals and the $X$ ($X$ =
+F, Cl, and Br) $p$ orbitals increases from F to Br, leading the electrons in
+K$_2$OsF$_6$ to be more localized than in K$_2$OsCl$_6$ and K$_2$OsBr$_6$,
+resulting in a smaller bandwidth for K$_2$OsF$_6$ than in the Cl- or Br- cases.
+Our results provide guidance to experimentalists and theorists working on this
+interesting family of osmium halides.",2206.05223v2
+2006-03-27,Coupling Between the Spin and Gravitational Field and the Equation of Motion of the Spin,"In general relativity, the equation of motion of the spin is given by the
+equation of parallel transport, which is a result of the space-time geometry.
+Any result of the space-time geometry can not be directly applied to gauge
+theory of gravity. In gauge theory of gravity, based on the viewpoint of the
+coupling between the spin and gravitational field, an equation of motion of the
+spin is deduced. In the post Newtonian approximation, it is proved that this
+equation gives out the same result as that of the equation of parallel
+transport. So, in the post Newtonian approximation, gauge theory of gravity
+gives out the same prediction on the precession of orbiting gyroscope as that
+of general relativity.",0603104v1
+2003-12-18,Frustrated quantum-spin system on a triangle coupled with $e_g$ lattice vibrations - Correspondence to Longuet-Higgins et al.'s Jahn-Teller model -,"We investigate the quantum three spin model $({\bf S_1},{\bf S_2},{\bf S_3})$
+of spin$=1/2$ on a triangle, in which spins are coupled with
+lattice-vibrational modes through the exchange interaction depending on
+distances between spin sites. The present model corresponds to the dynamic
+Jahn-Teller system $E_g\otimes e_g$ proposed by Longuet-Higgins {\it et al.},
+Proc.R.Soc.A.{\bf 244},1(1958). This correspondence is revealed by using the
+transformation to Nakamura-Bishop's bases proposed in Phys.Rev.Lett.{\bf
+54},861(1985). Furthermore, we elucidate the relationship between the behavior
+of a chiral order parameter ${\hat \chi}={\bf S_1\cdot(S_2\times S_3)}$ and
+that of the electronic orbital angular momentum ${\hat \ell_z}$ in $E_g\otimes
+e_g$ vibronic model: The regular oscillatory behavior of the expectation value
+$<{\hat \ell_z}>$ for vibronic structures with increasing energy can also be
+found in that of $<{\hat \chi}>$. The increase of the additional
+anharmonicity(chaoticity) is found to yield a rapidly decaying irregular
+oscillation of $<{\hat \chi}>$.",0312039v1
+2007-09-10,Towards a dephasing diode: asymmetric and geometric dephasing,"We study the effect of a noisy environment on spin and charge transport in
+ballistic quantum wires with spin-orbit coupling (Rashba coupling). We find
+that the wire then acts as a ``dephasing diode'', inducing very different
+dephasing of the spins of right and left movers. We also show how Berry phase
+(geometric phase) in a curved wire can induce such asymmetric dephasing, in
+addition to purely geometric dephasing. We propose ways to measure these
+effects through spin detectors, spin-echo techniques, and Aharanov-Bohm
+interferometry.",0709.1381v2
+2009-05-29,Spin-spiral states in undoped manganites,"The experimental observation of multiferroic behavior in perovskite
+manganites with a spiral spin structure demands to clarify the origin of these
+magnetic states and their relation to ferroelectricity. We show that
+spin-spiral phases with diagonal wavevector and also the E-type phase exist for
+intermediate values of the Hund's rule and the Jahn-Teller coupling in the
+orbitally ordered and insulating state of the standard two-band model
+Hamiltonian for manganites. Our results support the spin-current mechanism for
+ferroelectricity and present an alternative view to earlier conclusions where
+frustrating superexchange couplings were crucial to obtain spin-spiral states.",0905.4811v2
+2013-06-15,Circuit QED with Hole-Spin Qubits in Ge/Si Nanowire Quantum Dots,"We propose a setup for universal and electrically controlled quantum
+information processing with hole spins in Ge/Si core/shell nanowire quantum
+dots (NW QDs). Single-qubit gates can be driven through electric-dipole-induced
+spin resonance, with spin-flip times shorter than 100 ps. Long-distance
+qubit-qubit coupling can be mediated by the cavity electric field of a
+superconducting transmission line resonator, where we show that operation times
+below 20 ns seem feasible for the entangling square-root-of-iSWAP gate. The
+absence of Dresselhaus spin-orbit interaction (SOI) and the presence of an
+unusually strong Rashba-type SOI enable precise control over the transverse
+qubit coupling via an externally applied, perpendicular electric field. The
+latter serves as an on-off switch for quantum gates and also provides control
+over the g factor, so single- and two-qubit gates can be operated
+independently. Remarkably, we find that idle qubits are insensitive to charge
+noise and phonons, and we discuss strategies for enhancing noise-limited gate
+fidelities.",1306.3596v2
+2014-02-05,First-Principles Study of the Honeycomb-Lattice Iridates Na2IrO3 in the Presence of Strong Spin-Orbit Interaction and Electron Correlations,"An effective low-energy Hamiltonian of itinerant electrons for iridium oxide
+Na2IrO3 is derived by an ab initio downfolding scheme. The model is then
+reduced to an effective spin model on a honeycomb lattice by the strong
+coupling expansion. Here we show that the ab initio model contains spin-spin
+anisotropic exchange terms in addition to the extensively studied Kitaev and
+Heisenberg exchange interactions, and allows to describe the experimentally
+observed zigzag magnetic order, interpreted as the state stabilized by the
+antiferromagnetic coupling of the ferromagnetic chains. We clarify possible
+routes to realize quantum spin liquids from existing Na2IrO3.",1402.1030v2
+2014-07-16,Tunnel Magnetoresistance scan of a pristine three-dimensional topological insulator,"Though the Fermi surface of surface states of a 3D topological insulator (TI)
+has zero magnetization, an arbitrary segment of the full Fermi surface has a
+unique magnetic moment consistent with the type of spin-momentum locking in
+hand. We propose a three-terminal set up, which directly couples to the
+magnetization of a chosen segment of a Fermi surface hence leading to a finite
+tunnel magnetoresistance (TMR) response of the nonmagnetic TI surface states,
+when coupled to spin polarized STM probe. This multiterminal TMR not only
+provides a unique signature of spin-momentum locking for a pristine TI but also
+provides a direct measure of momentum resolved out of plane polarization of
+hexagonally warped Fermi surfaces relevant for $Bi_2Te_3$, which could be as
+comprehensive as spin-resolved ARPES. Implication of this unconventional TMR is
+also discussed in the broader context of 2D spin-orbit (SO) materials.",1407.4407v2
+2014-08-02,Crossover from Room-temperature Double-channel Ballistic Transport to Single-channel Ballistic Transport in Zigzag Graphene Nanoribbons,"Very recently, it was demonstrated explicitly that a zigzag graphene
+nanoribbon (GNR) exhibits a crossover of conductance from G0 to G0/2 with
+increasing the length (G0 = 2e2/h is the quantum of conductance) even at
+room-temperature [Baringhaus, et al. Nature 506, 349 (2014)]. Such a result is
+puzzling as none of previous theories seem to match the experimental
+observations. Here, we propose a model to explain the crossover from
+double-channel to single-channel ballistic transport in zigzag GNR. The sp3
+distortion of carbon atoms at the GNR edges induces a large spin-orbit coupling
+on the edges atoms, which enhances spin-flip scattering of edge states of the
+zigzag GNR. With sufficient spin-flip scattering, the wave-function of edge
+states becomes a superposition of the spin-up and spin-down components. Then
+the coupling of the two edges becomes important. This removes the edge degree
+of freedom in the zigzag GNR and results in the evolution of the conductance
+from G0 to G0/2 with increasing the length.",1408.0327v3
+2015-05-01,Local Spectroscopic Characterization of Spin and Layer Polarization in WSe$_2$,"We report scanning tunneling microscopy (STM) and spectroscopy (STS)
+measurements of monolayer and bilayer WSe$_2$. We measure a band gap of 2.21
+$\pm$ 0.08 eV in monolayer WSe$_2$, which is much larger than the energy of the
+photoluminescence peak indicating a large excitonic binding energy. We
+additionally observe significant electronic scattering arising from
+atomic-scale defects. Using Fourier transform STS (FT-STS), we map the energy
+versus momentum dispersion relations for monolayer and bilayer WSe$_2$.
+Further, by tracking allowed and forbidden scattering channels as a function of
+energy we infer the spin texture of both the conduction and valence bands. We
+observe a large spin-splitting of the valence band due to strong spin-orbit
+coupling, and additionally observe spin-valley-layer coupling in the conduction
+band of bilayer WSe$_2$.",1505.00245v2
+2015-07-07,Solutions of Mathisson-Papapetrou equations for highly relativistic spinning particles,"Different types of essentially nongeodesic motions of highly relativistic
+spinning particles in Schwarzschild's and Kerr's background which follows from
+the Mathisson-Papapetrou (MP) equations are considered. It is shown that
+dependently on the correlation of signs of the spin and the particle's orbital
+velocity the spin-gravity coupling acts as a significant repulsive or
+attractive force. Numerical estimates for electrons, protons, and neutrinos in
+the gravitational field of black holes are presented. The correspondence
+between the general relativistic Dirac equation and MP equations is discussed.
+It is stressed that for the highly relativistic motions the adequate
+supplementary condition for the MP equations is the Mathisson-Pirani condition.
+In the following it is important to study the possible role of the highly
+relativistic spin-gravity coupling in astrophysics, cosmology, and high energy
+physics.",1507.01696v1
+2015-09-15,Dynamical current-induced ferromagnetic and antiferromagnetic resonances,"We demonstrate that ferromagnetic and antiferromagnetic excitations can be
+triggered by the dynamical spin accumulations induced by the bulk and surface
+contributions of the spin Hall effect. Due to the spin-orbit interaction, a
+time-dependent spin density is generated by an oscillatory electric field
+applied parallel to the atomic planes of Fe/W(110) multilayers. For symmetric
+trilayers of Fe/W/Fe in which the Fe layers are ferromagnetically coupled, we
+demonstrate that only the collective out-of-phase precession mode is excited,
+while the uniform (in-phase) mode remains silent. When they are
+antiferromagnetically coupled, the oscillatory electric field sets the Fe
+magnetizations into elliptical precession motions with opposite angular
+velocities. The manipulation of different collective spin-wave dynamical modes
+through the engineering of the multilayers and their thicknesses may be used to
+develop ultrafast spintronics devices. Our work provides a general framework
+that probes the realistic responses of materials in the time or frequency
+domain.",1509.04599v2
+2014-06-26,High-Energy Damping by Particle-Hole Excitations in the Spin-Wave Spectrum of Iron-Based Superconductors,"Using a degenerate double-exchange model, we investigate the spin excitation
+spectra of iron pnictides. The model consists of local spin moments on each Fe
+site, as well as itinerant electrons from the degenerate $d_{xz}$ and $d_{yz}$
+orbitals. The local moments interact with each other through antiferromagnetic
+$J_{1}$-$J_{2}$ Heisenberg interactions, and they couple to the itinerant
+electrons through a ferromagnetic Hund coupling. We employ the fermionic spinon
+representation for the local moments and perform a generalized random-phase
+approximation calculation on both spinons and itinerant electrons. We find that
+in the $\left(\pi,0\right)$ magnetically-ordered state, the spin-wave
+excitation at $\left(\pi,\pi\right)$ is pushed to a higher energy due to the
+presence of itinerant electrons, which is consistent with a previous study
+using the Holstein-Primakoff transformation. In the paramagnetic state, the
+particle-hole continuum keeps the collective spin excitation near
+$\left(\pi,\pi\right)$ at a higher energy even without any $C_{4}$ symmetry
+breaking. The implications for recent high temperature neutron scattering
+measurements will be discussed.",1406.6737v3
+2016-08-07,An electrically driven spin qubit based on valley mixing,"The electrical control of single spin qubits based on semiconductor quantum
+dots is of great interest for scalable quantum computing since electric fields
+provide an alternative mechanism for qubit control compared with magnetic
+fields and can also be easier to produce. Here we outline the mechanism for a
+drastic enhancement in the electrically-driven spin rotation frequency for
+silicon quantum dot qubits in the presence of a step at a hetero-interface. The
+enhancement is due to the strong coupling between the ground and excited states
+which occurs when the electron wave-function overcomes the potential barrier
+induced by the interface step. We theoretically calculate single qubit gate
+times of 170ns for a quantum dot confined at a silicon/silicon-dioxide
+interface. The engineering of such steps could be used to achieve fast
+electrical rotation and entanglement of spin qubits despite the weak spin-orbit
+coupling in silicon.",1608.02189v2
+2017-12-09,Photon-induced tunability of the thermospin current in a Rashba ring,"The goal of this work is to show how the thermospin polarization current in a
+quantum ring changes in the presence of Rashba spin-orbit coupling and a
+quantized single photon mode of a cavity the ring is placed in. Employing the
+reduced density operator and a general master equation formalism, we find that
+both the Rashba interaction and the photon field can significantly modulate the
+spin polarization and the thermospin polarization current. Tuning the Rashba
+coupling constant, degenerate energy levels are formed corresponding to the
+Aharonov-Casher destructive phase interference in the quantum ring system. Our
+analysis indicates that the maximum spin polarization can be observed at the
+points of degenerate energy levels due to spin accumulation in the system
+without the photon field. The thermospin current is thus suppressed. In the
+presence of the cavity, the photon field leads to an additional kinetic
+momentum of the electron. As a result the spin polarization can be enhanced by
+the photon field.",1712.03386v1
+2018-09-07,Spin-Conserving Resonant Tunneling in Twist-Controlled WSe2-hBN-WSe2 Heterostructures,"We investigate interlayer tunneling in heterostructures consisting of two
+tungsten diselenide (WSe2) monolayers with controlled rotational alignment, and
+separated by hexagonal boron nitride. In samples where the two WSe2 monolayers
+are rotationally aligned we observe resonant tunneling, manifested by a large
+conductance and negative differential resistance in the vicinity of zero
+interlayer bias, which stem from energy- and momentum-conserving tunneling.
+Because the spin-orbit coupling leads to coupled spin-valley degrees of
+freedom, the twist between the two WSe2 monolayers allows us to probe the
+conservation of spin-valley degree of freedom in tunneling. In heterostructures
+where the two WSe2 monolayers have a 180{\deg} relative twist, such that the
+Brillouin zone of one layer is aligned with the time-reversed Brillouin zone of
+the opposite layer, the resonant tunneling between the layers is suppressed.
+These findings provide evidence that in addition to momentum, the spin-valley
+degree of freedom is also conserved in vertical transport.",1809.02639v1
+2018-09-17,Chiral and helical $p$-wave superconductivity in doped bilayer BiH,"We investigate the superconductivity (SC) driven by correlation effects in
+electron-doped bilayer BiH near a type-II van Hove singularity (vHS). By
+functional renormalization group, we find triplet $p$-wave pairing prevails in
+the interaction parameter space, except for spin density wave (SDW) closer to
+the vHS or when the interaction is too strong. Because of the large atomic
+spin-orbital coupling (SOC), the $p$-wave pairing occurs between equal-spin
+electrons, and is chiral and two-fold degenerate. The chiral state supports
+in-gap edge states, even though the low energy bands in the SC state are
+topologically trivial. The absence of mirror symmetry allows Rashba SOC that
+couples unequal spins, but we find its effect is of very high order, and can
+only drive the chiral $p$-wave into helical $p$-wave deep in the SC state.
+Interestingly, there is a six-fold degeneracy in the helical states, reflected
+by the relative phase angle $\theta=n\pi/3$ (for integer $n$) between the spin
+components of the helical pairing function. The phase angle is shown to be
+stable in the vortex state.",1809.06103v1
+2019-07-07,Spin-valley system in a gated MoS$_2$-monolayer quantum dot,"The aim of presented research is to design a nanodevice based on a
+gate-defined quantum dot within a MoS$_2$ monolayer in which we confine a
+single electron. By applying control voltages to the device gates we modulate
+the confinement potential and force intervalley transitions. The present Rashba
+spin-orbit coupling additionally allows for spin operations. Moreover, both
+effects enable the spin-valley SWAP. The device structure is modeled
+realistically, taking into account feasible dot-forming potential and electric
+field that controls the Rasha coupling. Therefore, by performing reliable
+numerical simulations, we show how by electrically controlling the state of the
+electron in the device, we can obtain single- and two-qubit (thus universal)
+gates in a spin-valley two-qubit system. Through simulations we investigate
+possibility of implementation of two qubits \textit{locally}, based on single
+electron, with an intriguing feature that two-qubit gates are easier to realize
+than single ones.",1907.03299v2
+2019-04-18,Phase coherent transport in bilayer and trilayer MoS2,"Bilayer MoS2 is a centrosymmetric semiconductor with degenerate spin states
+in the six valleys at the corners of the Brillouin zone. It has been proposed
+that breaking of this inversion symmetry by an out-of-plane electric field
+breaks this degeneracy, allowing for spin and valley lifetimes to be
+manipulated electrically in bilayer MoS2 with an electric field. In this work,
+we report phase-coherent transport properties of double-gated mono-, bi-, and
+tri-layer MoS2. We observe a similar crossover from weak localization to weak
+anti-localization, from which we extract the spin relaxation time as a function
+of both electric field and temperature. We find that the spin relaxation time
+is inversely proportional to momentum relaxation time, indicating that
+D'yakonov-Perel mechanism is dominant in all devices despite its
+centrosymmetry. Further, we found no evidence of electric-field induced changes
+in spin-orbit coupling strength. This suggests that the interlayer coupling is
+sufficiently weak and that electron-doped dichalcogenide multilayers behave
+electrically as decoupled monolayers.",1904.08597v1
+2020-05-06,Phase Shift in Skyrmion Crystals,"The skyrmion crystal is a periodic array of a swirling topological spin
+texture. Since it is regarded as an interference pattern by multiple helical
+spin density waves, the texture changes with the relative phases among the
+constituent waves. Although the phase degree of freedom is relevant to not only
+magnetism but also transport properties, its effect has not been elucidated
+thus far. We here theoretically show that a phase shift can occur in the
+skyrmion crystals to stabilize tetra-axial vortex crystals with staggered
+scalar spin chirality. This leads to spontaneous breaking of the lattice
+symmetry, which results in nonreciprocal transport phenomena even without the
+relativistic spin-orbit coupling. We show that such a phase shift is driven by
+long-range chirality interactions or thermal fluctuations in spin-charge
+coupled systems.",2005.03168v1
+2021-04-28,Magnetically induced polarization in centrosymmetric bonds,"We reveal the microscopic origin of electric polarization $\vec{P}$ induced
+by noncollinear magnetic order. We show that in Mott insulators, such $\vec{P}$
+is given by all possible combinations of position operators $\hat{\vec{r}}_{ij}
+= (\vec{r}_{ij}^{\, 0},\vec{\boldsymbol{r}}_{ij}^{\phantom{0}})$ and transfer
+integrals $\hat{t}_{ij} = (t_{ij}^{0},\boldsymbol{t}_{ij}^{\phantom{0}})$ in
+the bonds, where $\vec{r}_{ij}^{\, 0}$ and $t_{ij}^{0}$ are spin-independent
+contributions in the basis of Kramers doublet states, while
+$\vec{\boldsymbol{r}}_{ij}^{\phantom{0}}$ and
+$\boldsymbol{t}_{ij}^{\phantom{0}}$ stem solely from the spin-orbit
+interaction. Among them, the combination $t_{ij}^{0}
+\vec{\boldsymbol{r}}_{ij}^{\phantom{0}}$, which couples to the spin current,
+remains finite in the centrosymmetric bonds, thus yielding finite $\vec{P}$ in
+the case of noncollinear arrangement of spins. The form of the magnetoelectric
+coupling, which is controlled by $\vec{\boldsymbol{r}}_{ij}^{\phantom{0}}$,
+appears to be rich and is not limited to the phenomenological law $\vec{P} \sim
+\boldsymbol{\epsilon}_{ij} \times [\boldsymbol{e}_{i} \times
+\boldsymbol{e}_{j}]$ with $\boldsymbol{\epsilon}_{ij}$ being the bond vector
+connecting the spins $\boldsymbol{e}_{i}$ and $\boldsymbol{e}_{j}$. Using
+density-functional theory, we illustrate how the proposed mechanism work in the
+spiral magnets CuCl$_2$, CuBr$_2$, CuO, and $\alpha$-Li$_2$IrO$_3$, providing
+consistent explanation to available experimental data.",2104.13711v2
+2016-03-13,The vicinity of hyper-honeycomb $β$-Li2IrO3 to a three-dimensional Kitaev spin liquid state,"Due to the combination of a substantial spin-orbit coupling and correlation
+effects, iridium oxides hold a prominent place in the search for novel quantum
+states of matter, including, e.g., Kitaev spin liquids and topological Weyl
+states. We establish the promise of the very recently synthesized
+hyper-honeycomb iridate $\beta$-Li2IrO3 in this regard. A detailed theoretical
+analysis reveals the presence of large ferromagnetic first-neighbor Kitaev
+interactions, while a second-neighbor antiferromagnetic Heisenberg exchange
+drives the ground state from ferro to zigzag order via a three-dimensional
+Kitaev spin liquid and an incommensurate phase. Experiment puts the system in
+the latter regime but the Kitaev spin liquid is very close and reachable by a
+slight modification of the ratio between the second- and first-neighbor
+couplings, for instance via strain.",1603.04003v1
+2016-10-21,Unconventional superconductivity from magnetism in transition metal dichalcogenide,"We investigate proximity-induced superconductivity in monolayers of
+transition metal dichalcogenides (TMDs) in the presence of an externally
+generated exchange field. A variety of superconducting order parameters is
+found to emerge from the interplay of magnetism and superconductivity, covering
+the entire spectrum of possibilities to be symmetric or antisymmetric with
+respect to the valley and spin degrees of freedom, as well as even or odd in
+frequency. More specifically, when a conventional \emph{s}-wave superconductor
+with singlet Copper pairs is tunnel-coupled to the TMD layer, both spin-singlet
+and triplet pairings between electrons from the same and opposite valleys arise
+due to the combined effects of intrinsic spin-orbit coupling and a
+magnetic-substrate-induced exchange field. As a key finding, we reveal the
+existence of an exotic even-frequency triplet pairing between equal-spin
+electrons from different valleys, which arises whenever the spin orientations
+in the two valleys are noncollinear. All types of superconducting order turn
+out to be highly tunable via straightforward manipulation of the external
+exchange field.",1610.06730v2
+2019-06-18,Indirect Chiral Magnetic Exchange through Dzyaloshinskii-Moriya--Enhanced RKKY Interactions in Manganese Oxide Chains on Ir(100),"Ruderman-Kittel-Kasuya-Yosida interaction even if their wave functions lack
+direct overlap. Theory predicts that spin-orbit scattering leads to a
+Dzyaloshinskii-Moriya type enhancement of this indirect exchange interaction,
+giving rise to chiral exchange terms. Here we present a combined spin-polarized
+scanning tunneling microscopy, angle-resolved photoemission, and density
+functional theory study of MnO$_2$ chains on Ir(100). Whereas we find
+antiferromagnetic Mn--Mn coupling along the chain, the inter-chain coupling
+across the non-magnetic Ir substrate turns out to be chiral with a
+$120^{\circ}$ rotation between adjacent MnO$_2$ chains. Calculations reveal
+that the Dzyaloshinskii-Moriya interaction results in spin spirals with a
+periodicity in agreement with experiment. Our findings confirm the existence of
+indirect chiral magnetic exchange, potentially giving rise to exotic phenomena,
+such as chiral spin-liquid states in spin ice systems or the emergence of new
+quasiparticles.",1906.07703v1
+2019-06-27,Signatures of quantum mechanical Zeeman effect in classical transport due to topological properties of two-dimensional spin-3/2 holes,"The Zeeman interaction is a quantum mechanical effect that underpins
+spin-based quantum devices such as spin qubits. Typically, identification of
+the Zeeman interaction needs a large out-of-plane magnetic field coupled with
+ultralow temperatures, which limits the practicality of spin-based devices.
+However, in two-dimensional (2D) semiconductor holes, the strong spin-orbit
+interaction causes the Zeeman interaction to couple the spin, the magnetic
+field, and the momentum, and has terms with different winding numbers. In this
+work, we demonstrate a physical mechanism by which the Zeeman terms can be
+detected in classical transport. The effect we predict is very strong, and
+tunable by means of both the density and the in-plane magnetic field. It is a
+direct signature of the topological properties of the 2D hole system, and a
+manifestation in classical transport of an effect stemming from relativistic
+quantum mechanics. We discuss experimental observation and implications for
+quantum technologies.",1906.11439v2
+2020-09-02,Giant inverse Faraday effect in Dirac semimetals,"We have studied helicity dependent photocurrent (HDP) in Bi-based Dirac
+semimetal thin films. HDP increases with film thickness before it saturates,
+changes its sign when the majority carrier type is changed from electrons to
+holes and takes a sharp peak when the Fermi level lies near the charge
+neutrality point. These results suggest that irradiation of circularly
+polarized light to Dirac semimetals induces an effective magnetic field that
+aligns the carrier spin along the light spin angular momentum and generates a
+spin current along the film normal. The effective magnetic field is estimated
+to be orders of magnitude larger than that caused by the inverse Faraday effect
+(IFE) in typical transition metals. We consider the small effective mass and
+the large $g$-factor, characteristics of Dirac semimetals with strong spin
+orbit coupling, are responsible for the giant IFE, opening pathways to develop
+systems with strong light-spin coupling.",2009.01388v1
+2022-05-05,Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots,"An anomalous energy splitting of spin triplet states at zero magnetic field
+has recently been measured in germanium quantum dots. This zero-field splitting
+could crucially alter the coupling between tunnel-coupled quantum dots, the
+basic building blocks of state-of-the-art spin-based quantum processors, with
+profound implications for semiconducting quantum computers. We develop an
+analytical model linking the zero-field splitting to spin-orbit interactions
+that are cubic in momentum. Such interactions naturally emerge in hole
+nanostructures, where they can also be tuned by external electric fields, and
+we find them to be particularly large in silicon and germanium, resulting in a
+significant zero-field splitting in the $\mu$eV range. We confirm our
+analytical theory by numerical simulations of different quantum dots, also
+including other possible sources of zero-field splitting. Our findings are
+applicable to a broad range of current architectures encoding spin qubits and
+provide a deeper understanding of these materials, paving the way towards the
+next generation of semiconducting quantum processors.",2205.02582v1
+2022-07-06,Continuous transition between Ising magnetic order and a chiral spin liquid,"The competition between fractionalized spin-liquid states and magnetically
+ordered phases is an important paradigm in frustrated magnetism. Spin-orbit
+coupled Mott insulators with Ising-like magnetic anisotropies, such as Kitaev
+materials, are a particularly rich playground to explore this competition. In
+this work, we use effective field theory methods to show that a direct quantum
+phase transition can occur in two-dimensional (2D) Ising spin systems between a
+topologically ordered chiral spin liquid and a phase with magnetic long-range
+order. Such a transition can be protected by lattice symmetries and is
+described by a theory of massless Majorana fields coupled to non-Abelian
+$SO(N)$ gauge fields with a Chern-Simons term. We further show that Euclidean
+Majorana zero modes bound to $\mathbb{Z}_2$ monopole-instantons in the emergent
+non-Abelian gauge field are key to understanding spontaneous symmetry breaking
+in the ordered phase.",2207.02701v3
+2023-07-04,Probing general relativistic spin-orbit coupling with gravitational waves from hierarchical triple systems,"Wave packets propagating in inhomogeneous media experience a coupling between
+internal and external degrees of freedom and, as a consequence, follow
+spin-dependent trajectories. These are known as spin Hall effects, which are
+well known in optics and condensed matter physics. Similarly, the gravitational
+spin Hall effect is expected to affect the propagation of gravitational waves
+on curved spacetimes. In this general-relativistic setup, the curvature of
+spacetime acts as impurities in a semiconductor or inhomogeneities in an
+optical medium, leading to a frequency- and polarization-dependent propagation
+of wave packets. In this letter, we study this effect for strong-field lensed
+gravitational waves generated in hierarchical triple black hole systems in
+which a stellar-mass binary merges near a more massive black hole. We calculate
+how the gravitational spin Hall effect modifies the gravitational waveforms and
+show its potential for experimental observation. If detected, these effects
+will bear profound implications for astrophysics and tests of general
+relativity.",2307.01903v1
+2007-08-15,Spin relaxation in $n$-type GaAs quantum wells with transient spin grating,"By solving the kinetic spin Bloch equations, we study the time evolution of
+the transient spin grating, whose spin polarization varies periodically in real
+space, confined in (001) GaAs quantum wells. With this study we can investigate
+the properties of both the spin transport and the spin relaxation at the same
+time. The Fourier component of the spin signal decays double exponentially with
+two decay rates $1/\tau_+$ and $1/\tau_-$. In high temperature regime, the
+average of these two rates varies with the grating wave-vector $q$
+quadratically, i.e., $(1/\tau_++1/\tau_-)/2=D_sq^2+1/\tilde{\tau}_s$, with
+$D_s$ and $\tilde{\tau}_s$ representing the spin diffusion coefficient and the
+average of the out-of-plane and the in-plane spin relaxation times
+respectively. $\tau_{\pm}$ calculated from our theory are in good agreement
+with the experimental data by Weber {\em et al.} [Phys. Rev. Lett. {\bf 98},
+076604 (2007)]. By comparing $D_s$ with and without the electron-electron
+Coulomb scattering, we calculate the contribution of Coulomb drag to the spin
+diffusion coefficient. With the transient spin grating result, we further
+reveal the relations among different characteristic parameters such as spin
+diffusion coefficient $D_s$, spin relaxation time $\tau_s$, and spin injection
+length $L_s$. We show that in the presence of the Dresselhaus and/or Rashba
+spin-orbit coupling, the widely used relation $L_s=\sqrt{D_s\tau_s}$ is
+generally inaccurate and can even be very wrong in some special cases. We
+present an accurate way to extract the steady-state transport characteristic
+parameters from the transient spin grating signals.",0708.1975v4
+2020-07-07,Proposed ordering of textured spin singlets in a bulk infinite layer nickelate,"The infinite-layer structure nickelate Ba$_2$NiO$_2$(AgSe)$_2$ (BNOAS) with
+$d^8$ Ni ions and a peculiar susceptibility $\chi(T)$ is studied with
+correlated density functional methods. The overriding feature of the
+calculations is violation of Hund's rule coupled with complete but
+unconventional spin-orbital polarization, leading to an unexpected low spin
+$^1B_1$, ""off-diagonal singlet"" (ODS) textured by an internal orbital structure
+of compensating $d_{x^2-y^2}^{\uparrow}$ and $d_{z^2}^{\downarrow}$ spins. This
+unconventional configuration has lower energy than conventional high-spin or
+low-spin alternatives. An electronic transition is obtained at a critical Ni-O
+separation $d_c^{Ni-O}=$2.03 \AA, above which Ni becomes magnetic in square
+planar NiO$_2$ compounds. We propose scenarios for the signature of magnetic
+reconstruction in $\chi(T)$ at $T_{m}$=130 K without any Curie-Weiss background
+(no moment) that invoke ordering of Ni $d^8$ moieties that are largely this
+generalized Kondo singlet. The underlying physics of this system is modeled by
+a Kondo sieve model (2D Kondo necklace) of a ""Kondo"" $d_{z^2}$ spin on each
+site, coupled to a $d_{x^2-y^2}$ spin that is itself strongly coupled to
+neighboring like-spins within the layer. The observed magnetic order places
+BNOAS below the quantum critical point of the Kondo sieve model, providing a
+realization of the previously unreported long-range ordered near-singlet weak
+antiferromagnetic phase. We propose electron doping experiments that would
+drive the system toward a $d^{9-\delta}$ configuration and possible
+superconductivity with similarity to the recently reported Ba$_2$CuO$_{3.2}$
+that superconducts at 73 K.",2007.03185v3
+2022-12-15,Non-trivial band topology and orbital-selective electronic nematicity in a new titanium-based kagome superconductor,"Electronic nematicity that spontaneously breaks rotational symmetry has been
+shown as a generic phenomenon in correlated quantum systems including
+high-temperature superconductors and the AV3Sb5 (A = K, Rb, Cs) family with a
+kagome network. Identifying the driving force has been a central challenge for
+understanding nematicity. In iron-based superconductors, the problem is
+complicated because the spin, orbital and lattice degrees of freedom are
+intimately coupled. In vanadium-based kagome superconductors AV3Sb5, the
+electronic nematicity exhibits an intriguing entanglement with the charge
+density wave order (CDW), making understanding its origin difficult. Recently,
+a new family of titanium-based kagome superconductors ATi3Bi5 has been
+synthesized. In sharp contrast to its vanadium-based counterpart, the
+electronic nematicity occurs in the absence of CDW. ATi3Bi5 provides a new
+window to explore the mechanism of electronic nematicity and its interplay with
+the orbital degree of freedom. Here, we combine polarization-dependent
+angle-resolved photoemission spectroscopy with density functional theory to
+directly reveal the band topology and orbital characters of the multi-orbital
+RbTi3Bi5. The promising coexistence of flat bands, type-II Dirac nodal line and
+nontrivial Z2 topological states is identified in RbTi3Bi5. Remarkably, our
+study clearly unveils the orbital character change along the G-M and G-K
+directions, implying a strong intrinsic inter-orbital coupling in the Ti-based
+kagome metals, reminiscent of iron-based superconductors. Furthermore,
+doping-dependent measurements directly uncover the orbital-selective features
+in the kagome bands, which can be well explained by the d-p hybridization. The
+suggested d-p hybridization, in collaboration with the inter-orbital coupling,
+could account for the electronic nematicity in ATi3Bi5.",2212.07958v1
+2001-12-19,Influence of orbital pair breaking on paramagnetically limited states in clean superconductors,"Paramagnetic pair breaking is believed to be of increasing importance in many
+layered superconducting materials such as cuprates and organic compounds.
+Recently, strong evidence for a phase transition to the
+Fulde-Ferrell-Larkin-Ovchinnikov(FFLO) state has been obtained for the first
+time. We present a new theory of competing spin and orbital pair breaking in
+clean superconducting films or layers. As a general result, we find that the
+influence of orbital pair breaking on the paramagnetically limited phase
+boundary is rather strong, and its neglect seldom justified. This is
+particularly true for the FFLO state which can be destroyed by a very small
+orbital contribution. We discuss the situation in YBa_2Cu_3O_7 which has two
+coupled conducting Cu-O layers per unit cell. As a consequence, an intrinsic
+orbital pair breaking component might exist even for applied field exactly
+parallel to the layers.",0112353v1
+2012-08-28,Orbital-selective Mott Phase in Multiorbital Models for Alkaline Iron Selenides K(1-x)Fe(2-y)Se2,"We study a multiorbital model for the alkaline iron selenides
+K(1-x)Fe(2-y)Se2 using a slave-spin method. With or without ordered vacancies,
+we identify a metal-to-Mott-insulator transition at the commensurate filling of
+six 3d electrons per iron ion. For Hund's couplings beyond a threshold value,
+this occurs via an intermediate orbital-selective Mott phase, in which the 3d
+xy orbital is Mott localized while the other 3d orbitals remain itinerant. This
+phase is still stabilized over a range of carrier dopings. Our results lead to
+an overall phase diagram for the alkaline iron selenides, which provides a
+unified framework to understand the interplay between the strength of vacancy
+order and carrier doping. In this phase diagram, the orbital-selective Mott
+phase provides a natural link between the superconducting K(1-x)Fe(2-y)Se2 and
+its Mott-insulating parent compound.",1208.5547v1
+2015-07-09,Dirac fermions in Fe ultra-thin film,"We show the existence of massive Dirac fermions in electronic band structures
+of a few Fe atomic layers with perpendicular magnetization. Based on a tight
+binding model fitted to ab-initio band structure, we observe four distinct
+massive Dirac fermions near the Fermi level, which result from atomic
+spin-orbit coupling of Fe and a band inversion between Fe $4s$-$3d_{x^2-y^2}$
+hybrid orbital band and $3d_{xy}$ orbital band. These lead to a valence band
+with finite Chern integer (+2) and chiral edge modes near the Fermi level. When
+the chemical potential is set inside the Dirac gap by carrier doping, the Hall
+conductivity exhibits a plateau-like structure with quantized value
+$2\frac{e^2}{h}$, and orbital magnetization shows a prominent increase, latter
+of which is mostly due to chiral orbital motion of electrons along the edge
+modes. We discuss the stability of the Dirac fermions in Fe(001) monolayer on
+MgO(001) substrate and Fe(001) bilayer case.",1507.02382v2
+2015-11-03,Converting normal insulators into topological insulators via tuning orbital levels,"Tuning the spin-orbit coupling strength via foreign element doping and/or
+modifying bonding strength via strain engineering are the major routes to
+convert normal insulators to topological insulators. We here propose an
+alternative strategy to realize topological phase transition by tuning the
+orbital level. Following this strategy, our first-principles calculations
+demonstrate that a topological phase transition in some cubic perovskite-type
+compounds CsGeBr$_3$ and CsSnBr$_3$ could be facilitated by carbon
+substitutional doping. Such unique topological phase transition predominantly
+results from the lower orbital energy of the carbon dopant, which can pull down
+the conduction bands and even induce band inversion. Beyond conventional
+approaches, our finding of tuning the orbital level may greatly expand the
+range of topologically nontrivial materials.",1511.00832v1
+2019-07-22,Electrically Tunable Superconductivity Through Surface Orbital Polarization,"We investigate the physical mechanisms for achieving an electrical control of
+conventional spin-singlet superconductivity in thin films by focusing on the
+role of surface orbital polarization. Assuming a multi-orbital description of
+the metallic state, due to screening effects the electric field acts by
+modifying the strength of the surface potential and, in turn, yields
+non-trivial orbital-Rashba couplings. The resulting orbital polarization at the
+surface and in its close proximity is shown to have a dramatic impact on
+superconductivity. We demonstrate that, by varying the strength of the electric
+field, the superconducting phase can be either suppressed, i.e. turned into
+normal metal, or undergo a $0-\pi$ transition with the $\pi$ phase being marked
+by non-trivial sign change of the superconducting order parameter between
+different bands. These findings unveil a rich scenario to design
+heterostructures with superconducting orbitronics effects.",1907.09227v3
+2019-09-06,Possible 'symmetry-imposed' near-nodal two-dimensional p-wave pairing in Sr$_2$RuO$_4$,"One key feature of the multi-orbital superconducting Sr$_2$RuO$_4$ is the
+presence of nodal or near-nodal quasiparticle excitations revealed in a wide
+variety of experiments. Typically, a nodal gap structure in a two-dimensional
+model would be inconsistent with the chiral or helical p-wave interpretations.
+However, we demonstrate that true gap nodes may emerge along certain
+high-symmetry directions on the quasi-one-dimensional Fermi surfaces, if the
+multi-orbital chiral or helical p-wave pairings acquire peculiar forms wherein
+the $d_{xz}$ and $d_{yz}$ orbitals develop $k_y$- and $k_x$-like pairings,
+respectively. Spin-orbit coupling $\eta$ induces a near-nodal gap of order
+$\eta^2/W^2 \Delta_0$, where $\Delta_0$ is the gap amplitude and $W$ roughly
+the bandwidth. Provided the aforementioned pairing is predominant, the
+near-nodal gap structure is robust upon the inclusion of other multi-orbital
+pairings that share the same symmetries. In light of the recent experimental
+progresses, our proposal suggests that two-dimensional p-wave pairings may
+still be viable candidate ground states for Sr$_2$RuO$_4$. A near-nodal helical
+p-wave order, for example, would also be consistent with the substantial drop
+in the NMR Knight shift under an in-plane magnetic field.",1909.03141v2
+2012-05-02,Na2IrO3 as a molecular orbital crystal,"Contrary to previous studies that classify Na2IrO3 as a realization of the
+Heisenberg-Kitaev model with dominant spin-orbit coupling, we show that this
+system represents a highly unusual case in which the electronic structure is
+dominated by the formation of quasi-molecular orbitals (QMOs), with substantial
+quenching of the orbital moments. The QMOs consist of six atomic orbitals on an
+Ir hexagon, but each Ir atom belongs to three different QMOs. The concept of
+such QMOs in solids invokes very different physics compared to the models
+considered previously. Employing density functional theory calculations and
+model considerations we find that both the insulating behavior and the
+experimentally observed zigzag antiferromagnetism in Na2IrO3 naturally follow
+from the QMO model.",1205.0434v3
+2019-06-12,Orbital Selectivity and Magnetic Ordering in Fe intercalated Dirac Semimetal Bi$_2$Se$_3$,"In this paper we investigate the intercalation effects of Iron (Fe) in the
+van der Waals gap of Bi$_2$Se$_3$ on the magnetic and transport properties
+using first-principles band structure estimations combined using dynamical
+mean-field theory. Inclusion of electronic correlations and spin-orbit coupling
+effects are found to result in the emergence of ferromagnetic properties in an
+intercalated Bi$_2$Se$_3$. Further the Dirac cone in the band structure of
+Bismuth Selenide is modified via Fe intercalation at moderate densities.
+Accompanied by novel structural effects, the onset of an orbital selective
+metal insulator transition in the Fe 3$d$ orbitals brings about a magnetic
+phase transition in the Fe intercalated Bi$_2$Se$_3$. Further we have explored
+the dependency of the inter-orbital electron-electron correlations on the
+magnetic ordering and the effects of intercalation in establishing new physical
+properties.",1906.05249v2
+2023-10-27,Theory of $d + id$ Second-Order Topological Superconductors,"Topological superconductors are a class of unconventional superconducting
+materials featuring sub-gap zero-energy Majorana bound modes that hold promise
+as a building block for topological quantum computing. In this work, we study
+the realization of second-order topology that defines anomalous gapless
+boundary modes in a two-orbital superconductor with spin-orbital couplings. We
+reveal a time-reversal symmetry-breaking second-order topological
+superconducting phase with $d+id$-wave orbital-dependent paring without the
+need for the external magnetic field. Remarkably, this orbital-active $d$-wave
+paring gives rise to anomalous zero-energy Majorana corner modes, which is in
+contrast to conventional chiral $d$-wave pairing, accommodating one-dimensional
+Majorana edge modes. Our work not only reveals a unique mechanism of
+time-reversal symmetry breaking second-order topological superconductors but
+also bridges the gap between second-order topology and orbital-dependent
+pairings.",2310.17992v1
+2012-07-26,Effect of pressure on the electronic and magnetic properties of CdV$_2$O$_4$: Density functional theory studies,"We investigate the effect of pressure on the electronic and magnetic states
+of CdV$_2$O$_4$ by using ab initio electronic structure calculations. The
+Coulomb correlation and spin-orbit coupling play important role in deciding the
+structural, electronic and magnetic properties of the compound. The total
+magnetic moment of V ion is found to be $\sim$1.3 $\mu_B$ and making an angle
+of $\sim$9.5 degree with the z-axis. In the tetragonal phase, the ground state
+is the orbital ordered state where V $d_{xz}$ and $d_{yz}$ obtitals are mainly
+occupied at the neighbouring sites. This work predicts the electronic phase
+transition from orbital-ordered-insulator to orbital-ordered-metal to
+orbital-disordered-metal with increasing pressure. The pressure induced
+broadening of lower and upper Hubbard bands gives rise to metal-insulator
+transition above 35 GPa. The simple mean-field theory used in the present work
+is able to describe the pressure dependent variation of the antiferromagnetic
+transition temperature suggesting the applicability of the method in the study
+of the magnetic behaviour of similar geometrically frustrated systems.",1207.6168v1
+2012-12-07,Monte Carlo study of an unconventional superconducting phase in Ir-oxide J_{eff}=1/2 Mott insulators induced by carrier doping,"Based on a microscopic theoretical study, we show that novel
+superconductivity is induced by carrier doping in layered perovskite Ir oxides
+where a strong spin-orbit coupling causes an effective total angular momentum
+J_{eff}=1/2 Mott insulator. Using a variational Monte Carlo method, we find an
+unconventional superconducting state in the ground state phase diagram of a
+t_{2g} three-orbital Hubbard model on the square lattice. This superconducting
+state is characterized by a d_{x^2-y^2}-wave ""pseudospin singlet"" formed by the
+J_{eff}=1/2 Kramers doublet, which thus contains inter-orbital as well as both
+singlet and triplet components of t_{2g} electrons. The superconducting state
+is found stable only by electron doping, but not by hole doping, for the case
+of carrier doped Sr_2IrO_4. We also study an effective single-orbital Hubbard
+model to discuss the similarities to high-T_c cuprate superconductors and the
+multi-orbital effects.",1212.1546v1
+2013-07-14,Weyl semimetals and superconductors designed in an orbital selective superlattice,"We propose two complementary design principles for engineering
+three-dimensional (3D) Weyl semimetals and superconductors in a layer-by-layer
+setup which includes even and odd parity orbitals in alternating layers -
+dubbed orbital selective superlattice. Such structure breaks mirror symmetry
+along the superlattice growth axis which, with the help of either a basal plane
+spin-orbit coupling or a spinless p+ip superconductivity, stabilizes a 3D Dirac
+node. To explore this idea, we develop a 3D generalization of Haldane model and
+a Bogoliubov-de-Gennes (BdG) Hamiltonian for the two cases, respectively, and
+show that a tunable single or multiple Weyl nodes with linear dispersion in all
+spatial directions can be engineered desirably in a widespread parameter space.
+We also demonstrate that a single helical Weyl band can be created at the
+$\Gamma$-point at the Fermi level in the superconducting case via gapping out
+either of the orbital state by violating its particle-hole symmetry but not any
+other symmetries. Finally, implications of our results for the realization of
+anomalous Hall effect and Majorana bound state are discussed.",1307.3697v2
+2012-01-17,Theory of orbital magnetization in disordered systems,"We present a general formula of the orbital magnetization of disordered
+systems based on the Keldysh Green's function theory in the gauge-covariant
+Wigner space. In our approach, the gauge invariance of physical quantities is
+ensured from the very beginning, and the vertex corrections are easily
+included. Our formula applies not only for insulators but also for metallic
+systems where the quasiparicle behavior is usually strongly modified by the
+disorder scattering. In the absence of disorders, our formula recovers the
+previous results obtained from the semiclassical theory and the perturbation
+theory. As an application, we calculate the orbital magnetization of a weakly
+disordered two-dimensional electron gas with Rashba spin-orbit coupling. We
+find that for the short range disorder scattering, its major effect is to the
+shifting of the distribution of orbital magnetization corresponding to the
+quasiparticle energy renormalization.",1201.3446v1
+2017-10-23,Chiral orbital magnetism of $p$-orbital bosons in optical lattices,"Chiral magnetism is a fascinating quantum phenomena that has been found in
+low-dimensional magnetic materials. It is not only interesting for
+understanding the concept of chirality, but also important for potential
+applications in spintronics. Past studies show that chiral magnets require both
+lack of the inversion symmetry and spin-orbit coupling to induce the
+Dzyaloshinskii-Moriya (DM) interaction. Here we report that the combination of
+inversion symmetry breaking and quantum degeneracy of orbital degrees of
+freedom will provide a new paradigm to achieve the chiral orbital magnetism. By
+means of the density matrix renormalization group (DMRG) calculation, we
+demonstrate that the chiral orbital magnetism can be found when considering
+bosonic atoms loaded in the $p$-band of an optical lattice in the Mott regime.
+The high tunability of our scheme is also illustrated through simply
+manipulating the inversion symmetry of the system for the cold atom
+experimental conditions.",1710.08145v1
+2020-11-17,Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3,"Nematic orders emerge nearly universally in iron-based superconductors, but
+elucidating their origins is challenging because of intimate couplings between
+orbital and magnetic fluctuations. The iron-based ladder material BaFe2S3,
+which superconducts under pressure, exhibits antiferromagnetic order below TN ~
+117K and a weak resistivity anomaly at T* ~ 180K, whose nature remains elusive.
+Here we report angle-resolved magnetoresistance (MR) and elastoresistance (ER)
+measurements in BaFe2S3, which reveal distinct changes at T*. We find that MR
+anisotropy and ER nematic response are both suppressed near T*, implying that
+an orbital order promoting isotropic electronic states is stabilized at T*.
+Such an isotropic state below T* competes with the antiferromagnetic order,
+which is evidenced by the nonmonotonic temperature dependence of nematic
+fluctuations. In contrast to the cooperative nematic orders in spin and orbital
+channels in iron pnictides, the present competing orders can provide a new
+platform to identify the separate roles of orbital and magnetic fluctuations.",2011.08600v1
+2021-03-16,Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A$_3$C$_{60}$,"The pairing mechanism in A$_3$C$_{60}$ is investigated by studying the
+properties of a three-orbital Hubbard model with antiferromagnetic Hund
+coupling in the normal and superconducting phase. Local orbital fluctuations
+are shown to be substantially enhanced in the superconducting state, with a
+fluctuation energy scale that matches the low-energy peak in the spectral
+weight of the order parameter. Our results demonstrate that local orbital
+fluctuations provide the pairing glue in strongly correlated fulleride
+superconductors and support the spin/orbital freezing theory of unconventional
+superconductivity. They are also consistent with the experimentally observed
+universal relation between the gap energy and local susceptibility in a broad
+range of unconventional superconductors.",2103.08925v1
+2022-01-24,Low-energy physics for an iron phthalocyanine molecule on Au(111),"The system of an iron phthalocyanine molecule on the Au(111) surface, has
+been studied recently due to its peculiar properties. In particular, several
+surprising results of scanning tunneling spectroscopy changing the position of
+the molecule and applying magnetic field can be explained by the {\it
+non-Landau} Fermi liquid state of a 2-channel spin-1 Kondo model with
+anisotropy. The localized orbitals near the Fermi level are three, one of
+symmetry $z^2$ and two (nearly) degenerate $\pi$ orbitals of symmetry $xz$ and
+$yz$. Previous studies using the numerical renormalization group neglected one
+of these orbitals to render the problem tractable. Here we investigate, using a
+slave-boson mean-field approximation, if the splitting $S$ between $\pi$
+orbitals caused by spin-orbit coupling (SOC) justifies this approximation. We
+obtain an abrupt transition from a 3-band regime to a 2-band one at a value of
+$S$ which is about 1/3 of the atomic SOC for Fe, justifying the 2-band model
+for the system.",2201.10010v2
+2018-03-11,Pressure-driven collapse of the relativistic electronic ground state in a honeycomb iridate,"The electronic ground state in many iridate materials is described by a
+complex wave-function in which spin and orbital angular momenta are entangled
+due to relativistic spin-orbit coupling (SOC). Such a localized electronic
+state carries an effective total angular momentum of $J_{eff}=1/2$. In
+materials with an edge-sharing octahedral crystal structure, such as the
+honeycomb iridates Li2IrO3 and Na2IrO3, these $J_{eff}=1/2$ moments are
+expected to be coupled through a special bond-dependent magnetic interaction,
+which is a necessary condition for the realization of a Kitaev quantum spin
+liquid. However, this relativistic electron picture is challenged by an
+alternate description, in which itinerant electrons are confined to a
+benzene-like hexagon, keeping the system insulating despite the delocalized
+nature of the electrons. In this quasi-molecular orbital (QMO) picture, the
+honeycomb iridates are an unlikely choice for a Kitaev spin liquid. Here we
+show that the honeycomb iridate Li2IrO3 is best described by a $J_{eff}=1/2$
+state at ambient pressure, but crosses over into a QMO state under the
+application of small (~ 0.1 GPa) hydrostatic pressure. This result illustrates
+that the physics of iridates is extremely rich due to a delicate balance
+between electronic bandwidth, spin-orbit coupling, crystal field, and electron
+correlation.",1803.04056v1
+2023-10-27,"Dirac surface states, multiorbital dimerization and superconductivity in Nb- and Ta-based A15 compounds","Using first-principle calculations, we investigate the electronic,
+topological and superconducting properties of Nb$_3$X (X = Ge, Sn, Sb) and
+Ta$_3$Y (Y = As, Sb, Bi) A15 compounds. We demonstrate that these compounds
+host Dirac surface states which are related to a nontrivial Z$_2$ topological
+value. The spin-orbit coupling (SOC) splits the eightfold degenerate R point
+close to the Fermi level enhancing the amplitude of the spin Hall conductance.
+Indeed, despite the moderate spin-orbit of the Nb-compounds, a large spin Hall
+effect is also obtained in Nb$_3$Ge and Nb$_3$Sn compounds. We show that the
+Coulomb interaction opens the gap at the R point thus making more evident the
+occurrence of Dirac surface states. We then investigate the superconducting
+properties by determining the strength of the electron-phonon BCS coupling. The
+evolution of the critical temperature is tracked down to the 2D limit
+indicating a reduction of the transition temperature which mainly arises from
+the suppression of the density of states at the Fermi level. Finally, we
+propose a minimal tight-binding model based on three coupled
+Su-Schrieffer-Heeger chains with t$_{2g}$ Ta- and Nb-orbitals reproducing the
+spin-orbit splittings at the R point among the $\pi$-bond bands in this class
+of compounds. We separate the kinetic parameters in $\pi$ and $\delta$-bonds,
+in intradimer and interdimer hoppings and discuss their relevance for the
+topological electronic structure. We point out that Nb$_3$Ge might represent a
+Z$_2$ topological metal with the highest superconducting temperature ever
+recorded.",2310.18245v2
+2002-07-26,Coulomb couplings in positively charged fullerene,"We compute, based on density-functional electronic-structure calculations,
+the Coulomb couplings in the h_u highest occupied orbital of molecular C60. We
+obtain a multiplet-averaged Hubbard U ~ 3 eV, and four Hund-rule-like
+intra-molecular multiplet-splitting terms, each of the order of few hundreds of
+meVs. According to these couplings, all C60^n+ ions should possess a high-spin
+ground state if kept in their rigid, undistorted form. Even after molecular
+distortions are allowed, however, the Coulomb terms still appear to be somewhat
+stronger than the previously calculated Jahn-Teller couplings, the latter
+favoring low-spin states. Thus for example in C60^2+, unlike C60^2-, the
+balance between Hund rule and Jahn Teller yields, even if marginally, a
+high-spin ground state. That seems surprising in view of reports of
+superconductivity in field-doped C60^n+ systems.",0207635v3
+2011-05-31,"Role of Hund's coupling in stabilization of the (0,pi) ordered SDW state within the minimal two-band model for iron pnictides","Spin wave excitations and stability of the (0,pi) ordered SDW state are
+investigated within the minimal two-band model for iron pnictides including a
+Hund's coupling term. The SDW state is shown to be stable in two distinct
+doping regimes --- finite hole doping in the lower SDW band for small second
+neighbour hoppings, and small electron doping in the upper SDW band for
+comparable first and second neighbour hoppings. In both cases, Hund's coupling
+strongly stabilizes the SDW state due to generation of additional ferromagnetic
+spin couplings involving the inter-orbital part of the particle-hole
+propagator. Spin wave energies for the two-band model are very similar to the
+one-band t-t' Hubbard model results obtained earlier, and are in agreement with
+inelastic neutron scattering studies of iron pnictides.",1105.6191v1
+2018-04-03,Adjustable current-induced magnetization switching utilizing interlayer exchange coupling,"Electrical current-induced deterministic magnetization switching in a
+magnetic multilayer structure without external magnetic field is realized by
+utilizing interlayer exchange coupling. Two ferromagnetic Co layers, with
+in-plane and out-of-plane anisotropy respectively, are separated by a spacer Ta
+layer, which plays a dual role of inducing antiferromagnetic interlayer
+coupling, and contributing to the current-induced effective magnetic field
+through the spin Hall effect. The current-induced magnetization switching
+behavior can be tuned by pre-magnetizing the in-plane Co layer. The
+antiferromagnetic exchange coupling field increases with decreasing thickness
+of the Ta layer, reaching 630+-5 Oe for a Ta thickness of 1.5nm. The magnitude
+of the current-induced perpendicular effective magnetic field from spin-orbit
+torque is 9.2 Oe/(107Acm-2). The large spin Hall angle of Ta, opposite in sign
+to that of Pt, results in a low critical current density of 9*10^6A/cm^2. This
+approach is promising for the electrical switching of magnetic memory elements
+without external magnetic field.",1804.00798v1
+2019-12-19,Magnetic Topological Kagome Systems,"The recently discovered material Co$_3$Sn$_2$S$_2$ shows an impressive
+behavior of the quantum anomalous Hall (QAH) conductivity driven by the
+interplay between ferromagnetism in the $z$ direction and antiferromagnetism in
+the $xy$ plane. Motivated by these facts, first we build and study a spin-1/2
+model to describe the magnetism of Co-atoms on the Kagome planes. Then, we
+include conduction electrons which are coupled to the spins-1/2 through a
+strong Hund's coupling. The spin-orbit coupling results in topological
+low-energy bands. For 2/3 on-site occupancy, we find a topological transition
+from a QAH ferromagnetic insulating phase with Chern number one to a quantum
+spin Hall (QSH) antiferromagnetic phase. The QAH phase is metallic when
+slightly changing the on-site occupancy. To account for temperature effects, we
+include fluctuations in the direction of the Hund's coupling. We show how the
+Hall conductivity can now smoothly evolve when spins develop a $120^o$
+antiferromagnetism in the $xy$ plane and can synchronize with the ferromagnetic
+fraction.",1912.09214v2
+2020-08-19,Magnetic competition in topological kagome magnets,"Magnetic competition in topological kagome magnets is studied by
+incorporating the spin-orbit coupling, the anisotropic Hund coupling and spin
+exchange into the kagome lattice. Using the Bogoliubov variational principle we
+find the stable phases at zero and finite temperatures. At zero temperature and
+in the strong Ising-Hund coupling regime, a magnetic tunability from the
+out-of-plane ferromagnetism (FM) to the in-plane antiferromagnetism (AFM) is
+achieved by a universal property of the critical in-plane Hund coupling. At
+two-thirds filling the phase transition from the out-of-plane FM to the
+in-plane AFM is accompanied by a topological transition from quantum anomalous
+Hall (QAH) to quantum anomalous spin Hall (QASH) effect. Nearby half filling a
+large anomalous Hall conductance is observed at the magnetic phase transition.
+At finite temperature the out-of-plane FM is stable until a crossing
+temperature, above which the in-plane AFM is stable, but the out-of-plane FM
+magnetization is still finite. This suggests a coexistence of these magnetic
+phases in a finite temperature range.",2008.08260v1
+2024-01-19,Photodriven germanium hole qubit,"Hole qubits in germanium quantum dots are promising candidates for coherent
+control and manipulation of the spin degree of freedom through electric dipole
+spin resonance. We theoretically study the time dynamics of a single heavy-hole
+qubit in a laser-driven planar germanium quantum dot confined laterally by a
+harmonic potential in presence of linear and cubic Rashba spin-orbit couplings
+and an out-of-plane magnetic field. We obtain an approximate analytical formula
+of the Rabi frequency using a Schrieffer-Wolff transformation and establish a
+connection of our model with the ESDR results obtained for this system. For
+stronger beams, we employ different methods such as unitary transformation and
+Floquet theory to study the time evolution numerically. We observe that high
+radiation intensity is not suitable for the qubit rotation due to the presence
+of high frequency noise superimposed on the Rabi oscillations. We display the
+Floquet spectrum and highlight the quasienergy levels responsible for the Rabi
+oscillations in the Floquet picture. We study the interplay of both the types
+of Rashba couplings and show that the Rabi oscillations, which are brought
+about by the linear Rashba coupling, vanish for typical values of the cubic
+Rashba coupling in this system.",2401.10570v1
+2020-03-17,Hole-phonon interactions in quantum dots: Effects of phonon confinement and encapsulation materials on spin-orbit qubits,"Spin-phonon interactions are one of the mechanisms limiting the lifetime of
+spin qubits made in semiconductor quantum dots. At variance with other
+mechanisms such as charge noise, phonons are intrinsic to the device and can
+hardly be mitigated. They set, therefore fundamental limits to the relaxation
+time of the qubits. Here we introduce a general framework for the calculation
+of the spin (and charge) transition rates induced by bulk (3D) and strongly
+confined 1D or 2D phonons. We discuss the particular case of hole spin-orbit
+qubits described by the 6 bands kp model. We next apply this theory to a hole
+qubit in a silicon-on-insulator device. We show that spin relaxation in this
+device is dominated by a band mixing term that couples the holes to transverse
+acoustic phonons through the valence band deformation potential d, and optimize
+the bias point and magnetic field orientation to maximize the number of Rabi
+oscillations Q that can be achieved within on relaxation time T1. Despite the
+strong spin-orbit coupling in the valence band, the phonon-limited Q can reach
+a few tens of thousands. We next explore the effects of phonon confinement in
+1D and 2D structures, and the impact of the encapsulation materials on the
+relaxation rates. We show that the spin lifetimes can depend on the structure
+of the device over micrometer-long length scales and that they improve when the
+materials around the qubit get harder. Phonon engineering in semiconductor
+qubits may therefore become relevant once the extrinsic sources of relaxation
+have been reduced.",2003.07592v2
+2015-06-16,Next-to-next-to-leading order gravitational spin-orbit coupling via the effective field theory for spinning objects in the post-Newtonian scheme,"We implement the effective field theory for gravitating spinning objects in
+the post-Newtonian scheme at the next-to-next-to-leading order level to derive
+the gravitational spin-orbit interaction potential at the third and a half
+post-Newtonian order for rapidly rotating compact objects. From the
+next-to-next-to-leading order interaction potential, which we obtain here in a
+Lagrangian form for the first time, we derive straightforwardly the
+corresponding Hamiltonian. The spin-orbit sector constitutes the most elaborate
+spin dependent sector at each order, and accordingly we encounter a
+proliferation of the relevant Feynman diagrams, and a significant increase of
+the computational complexity. We present the evaluation of the interaction
+potential, going over contributing Feynman diagrams. The computation is carried
+out in terms of the nonrelativistic gravitational fields, together with the
+various gauge choices included in the effective field theory for gravitating
+spinning objects, which optimize the calculation. In addition, we automatize
+the effective field theory computations, and carry out the automated
+computations in parallel. Such automated effective field theory computations
+would be most useful to obtain higher order post-Newtonian corrections. We
+compare our Hamiltonian to the ADM Hamiltonian, and arrive at a complete
+agreement between the ADM and effective field theory results. We provide
+complete gauge invariant relations among the binding energy, angular momentum,
+and orbital frequency of an inspiralling binary with generic compact spinning
+components to third and a half post-Newtonian order. The derivation presented
+here is essential to obtain further higher order post-Newtonian corrections,
+and to reach the accuracy level required for the successful detection of
+gravitational radiation.",1506.05056v4
+2012-06-22,Tight Binding Model of Mn12 Single Molecule Magnets: Electronic and Magnetic Structure and Transport Properties,"We describe and analyze a tight-binding model of single molecule magnets
+(SMMs) that captures both the spin and spatial aspects of the SMM electronic
+structure. The model generalizes extended Huckel theory to include the effects
+of spin polarization and spin-orbit coupling. For neutral and negatively
+charged Mn12 SMMs with acetate or benzoate ligands the model yields the total
+SMM spin, the spins of the individual Mn ions, the magnetic easy axis
+orientation, the size of the magnetic anisotropy barrier and the size of the
+HOMO-LUMO gap consistent with experiment. For neutral molecules the predicted
+spins and spatial locations of the HOMO are consistent with the results of
+density functional calculations. For the total spin and location of the LUMO
+density functional theory-based calculations yield varied results while the
+present model yield results consistent with experiments on negatively charged
+molecules. For Mn12 SMMs with thiolate- and methylsulphide-terminated benzoate
+ligands (Mn12-Ph-Th) we find the HOMO to be located on the magnetic core of the
+molecule, but (unlike for the Mn12 SMMs that have previously been studied
+theoretically), we predict the LUMO and near LUMO orbitals of Mn12-Ph-Th to be
+located on ligands. Therefore we predict that for these Mn12 SMMs resonant and
+off-resonant coherent transport via near-LUMO orbitals, not subject to Coulomb
+blockade, should occur. We propose that this effect can be used to identify
+specific experimentally realized SMM transistors in which the easy axis and
+magnetic moment are approximately parallel to the direction of the current
+flow. We also predict effective spin filtering by these SMMs to occur at low
+bias whether the transport is mediated by the HOMO that is on the magnetic core
+of the SMM or by near LUMO orbitals located on the nominally non-magnetic
+ligands.",1206.5314v1
+2023-11-28,Engineering a Spin-Orbit Bandgap in Graphene-Tellurium Heterostructures,"Intensive research has focused on harnessing the potential of graphene for
+electronic, optoelectronic, and spintronic devices by generating a bandgap at
+the Dirac point and enhancing the spin-orbit interaction in the graphene layer.
+Proximity to heavy p elements is a promising approach; however, their
+interaction in graphene heterostructures has not been as intensively studied as
+that of ferromagnetic, noble, or heavy d metals, neither as interlayers nor as
+substrates. In this study, the effective intercalation of Te atoms in a
+graphene on Ir(111) heterostructure is achieved. Combining techniques such as
+low energy electron diffraction and scanning tunneling microscopy, the
+structural evolution of the system as a function of the Te coverage is
+elucidated, uncovering up to two distinct phases. The presented angle-resolved
+photoemission spectroscopy analysis reveals the emergence of a bandgap of about
+240 meV in the Dirac cone at room temperature, which preserves its
+characteristic linear dispersion. Furthermore, a pronounced n-doping effect
+induced by Te in the heterostructure is also observed, and remarkably the
+possibility of tuning the Dirac point energy towards the Fermi level by
+reducing the Te coverage while maintaining the open bandgap is demonstrated.
+Spin-resolved measurements unveil a non-planar chiral spin texture with
+significant splitting values for both in-plane and out-of-plane spin
+components. These experimental findings are consistent with the development of
+a quantum spin Hall phase, where a Te-enhanced intrinsic spin orbit coupling in
+graphene surpasses the Rashba one and promotes the opening of the spin-orbit
+bandgap.",2311.16792v1
+2023-12-01,The maximum mass of a black hole which can tidally disrupt a star: measuring black hole spins with tidal disruption events,"The tidal acceleration experienced by an object at the event horizon of a
+black hole decreases as one over the square of the black hole's mass. As such
+there is a maximum mass at which a black hole can tidally disrupt an object
+outside of its event horizon and potentially produce observable emission. This
+maximum mass is known as the ``Hills mass'', and in full general relativity is
+a function of both the black hole's spin $a_\bullet$ and the inclination angle
+of the incoming object's orbit with respect to the black hole's spin axis
+$\psi$. In this paper we demonstrate that the Hills mass can be represented by
+a simple analytical function of $a_\bullet$ and $\psi$, the first general
+solution of this problem. This general solution is found by utilising the
+symmetries of a class of critical Kerr metric orbits known as the innermost
+bound spherical orbits. Interestingly, at fixed black hole spin the maximum
+Hills mass can lie at incoming orbital inclinations outside of the black hole's
+equatorial plane $\psi \neq \pi/2$. When compared to previous results in the
+literature this effect can lead to an increase in the maximum Hills mass (at
+fixed spin) by as much as a factor of $\sqrt{11/5} \simeq 1.48$ for a maximally
+rotating black hole. We then demonstrate how Bayesian inference, coupled with
+an estimate of the mass of a black hole in a tidal disruption event, can be
+used to place conservative constraints on that black hole's spin. We provide a
+publicly available code tidalspin which computes these spin distributions.",2312.00557v2
+2011-05-18,Importance of including small body spin effects in the modelling of extreme and intermediate mass-ratio inspirals,"We explore the ability of future low-frequency gravitational wave detectors
+to measure the spin of stellar mass and intermediate mass black holes that
+inspiral onto super-massive Kerr black holes (SMBHs). We develop a kludge
+waveform model based on the equations of motion derived by Saijo et al. [Phys
+Rev D 58, 064005, 1998] for spinning BH binaries, augmented with spin-orbit and
+spin-spin couplings taken from perturbative and post-Newtonian (PN)
+calculations, and the associated conservative self-force corrections, derived
+by comparison to PN results. We model the inspiral phase using accurate fluxes
+which include perturbative corrections for the spin of the inspiralling body,
+spin-spin couplings and higher-order fits to solutions of the Teukolsky
+equation. We present results of Monte Carlo simulations of parameter estimation
+errors and of the model errors that arise when we omit conservative corrections
+from the waveform template. For a source 5000+10^6 solar mass observed with an
+SNR of 1000, LISA will be able to determine the two masses to within a
+fractional error of ~0.001, measure the SMBH spin magnitude, q, and the spin
+magnitude of the inspiralling BH to 0.0001, 10%, respectively, and determine
+the location of the source in the sky and the SMBH spin orientation to within
+0.0001 steradians. For a 10+10^6 solar mass system observed with SNR of 30,
+LISA will not be able to determine the spin magnitude of the inspiralling BH,
+although the measurement of the other waveform parameters is not significantly
+degraded by the presence of spin. The model errors which arise from ignoring
+conservative corrections become significant for mass-ratios above 0.0001, but
+including these corrections up to 2PN order may be sufficient to reduce these
+systematic errors to an acceptable level.",1105.3567v3
+2023-04-21,Emergence of Rashba spin valley state in two-dimensional strained bismuth oxychalcogenides Bi$_{2}$O$_{2}$Se,"The experimental evidence of the ultra-high electron mobility and strong
+spin-orbit coupling in the two-dimensional (2D) layered bismuth-based
+oxyselenide, Bi$_{2}$O$_{2}$Se, makes it a potential material for spintronic
+devices. However, its spin-related properties have not been extensively studied
+due to the centrosymmetric nature of its crystal structure. By using
+first-principles density-functional theory calculation, this study reports the
+emergence of Rashba-spin-valley states in Bi$_{2}$O$_{2}$Se monolayer (ML).
+Breaking the crystal inversion symmetry of Bi$_{2}$O$_{2}$Se ML using an
+external electric field enables the Rashba-spin-valley formation, causing the
+appearance of the Rashba-type splitting around the $\Gamma$ valley and
+spin-valley coupling at the $D$ valleys located near the middle of $\Gamma-M$
+line. In addition to the typical Rashba-type spin textures around the $\Gamma$
+valley, the study also observed in-plane unidirectional spin textures around
+the $D$ valleys, which is a rare phenomenon in 2D materials. The observed
+Rashba-spin-valley states are driven by the lowering point group symmetry of
+the crystal from $D_{4h}$ to $C_{4v}$ enforced by the electric field, as
+clarified through $\vec{k}\cdot\vec{p}$ model derived from symmetry analysis.
+More importantly, tuning the Rashba and spin-valley states by using biaxial
+strain offers a promising route to regulate the spin textures and spin
+splitting preventing the electron from back-scattering in spin transport.
+Finally, we proposed a more realistic system, namely, Bi$_{2}$O$_{2}$Se
+ML/SrTiO$_{3}$ (001) heterointerface that supports the strong
+Rashba-spin-valley states and highlighting the potential of the
+Bi$_{2}$O$_{2}$Se ML for future spintronics and valleytronics-based devices.",2304.10746v2
+1995-02-06,Superconducting Instability in a 1D lattice of Berry Phase Molecules,"We study the 1D model of conduction electrons interacting with local vibronic
+modes. States in the conduction band are two-fold degenerate both in orbital
+index and spin. It is shown that such 1D system has a strong tendency to
+superconductivity. The superconducting pairing originates from coupling of two
+charge density waves; the scaling dimension of the order parameter is close to
+1/4.",9502023v1
+2002-07-05,Gap nodes in the superconducting phase of the itinerant ferromagnet $UGe_2$,"For the UGe$_2$ ferromagnetic superconductor the forms of the order parameter
+admitted by the crystal symmetry within the strong spin-orbit coupling scheme
+are written down. For each of the two possible phases existence of gap nodes
+required by symmetry is discussed and the nodes are found. Some consequences of
+presence of the nodes, which may be useful for experimental identification of
+the phases are discussed as well.",0207152v1
+2005-10-21,De Haas-van Alphen effect in metals without inversion center,"We show how the de Haas-van Alphen effect can be used to directly measure the
+magnitude of spin-orbit coupling in non-centrosymmetric metals, such as CePt3Si
+and LaPt3Si.",0510587v1
+2008-04-22,Pressure-temperature phase diagram of ferromagnetic superconductors,"The symmetry approach to the description of the (P,T) phase diagram of
+ferromagnet superconductors with triplet pairing is developed. Taking into
+account the recent experimental observations made on UCoGe it is considered the
+case of a crystal with orthorhombic structure and strong spin-orbital coupling.
+It is shown that formation of ferromagnet superconducting state from a
+superconducting state is inevitably accompanied by the first order type
+transition.",0804.3546v1
+2008-11-13,Spin-orbit coupling in ballistic carbon nanotubes,This paper has been withdrawn.,0811.2171v3
+2012-08-14,Antiferromagnetic Exchange Interaction between Electrons on Degenerate LUMOs in Benzene Dianion,"We discuss the ground state of Benzene dianion (Bz$^{2-}$) on the basis of
+the numerical diagonalization method of an effective model of $\pi$ orbitals.
+It is found that the ground state can be the spin singlet state, and the
+exchange coupling between LUMOs can be antiferromagnetic.",1208.2817v1
+2016-02-18,Gapped triplet $p$-wave superconductivity in strong spin-orbit-coupled semiconductor quantum wells in proximity to $s$-wave superconductor,"We show that the {\it gapped} triplet superconductivity, i.e., a triplet
+superconductor with triplet order parameter, can be realized in strong
+spin-orbit-coupled quantum wells in proximity to $s$-wave superconductor. It is
+revealed that with the singlet order parameter induced from the superconducting
+proximity effect, in quantum wells, not only can the triplet pairings arise due
+to the spin-orbit coupling, but also the triplet order parameter can be induced
+due to the repulsive effective electron-electron interaction, including the
+electron-electron Coulomb and electron-phonon interactions. This is a natural
+extension of the work of de Gennes, in which the repulsive-interaction-induced
+singlet order parameter arises in the normal metal in proximity to $s$-wave
+superconductor [Rev. Mod. Phys. {\bf 36}, 225 (1964)]. Specifically, we derive
+the effective Bogoliubov-de Gennes equation, in which the self-energies due to
+the effective electron-electron interactions contribute to the singlet and
+triplet order parameters. It is further shown that for the singlet order
+parameter, it is efficiently suppressed due to this self-energy
+renormalization; whereas for the triplet order parameter, it is the $p$-wave
+($p_x\pm ip_y$) one with the ${\bf d}$-vector parallel to the effective
+magnetic field due to the spin-orbit coupling. Finally, we perform the
+numerical calculation in InSb (100) quantum wells. Specifically, we reveal that
+the Coulomb interaction is much more important than the electron-phonon
+interaction at low temperature. Moreover, it shows that with proper electron
+density, the minimum of the renormalized singlet and the maximum of the induced
+triplet order parameters are comparable, and hence can be experimentally
+distinguished.",1602.05797v2
+2011-11-02,Dispersion and wavefunction symmetry in cold atoms experiencing artificial gauge fields,"We analyze the single particle quantum mechanics of an atom whose dispersion
+is modified by spin orbit coupling to Raman lasers. We calculate how the novel
+dispersion leads to unusual single particle physics. We focus on the symmetry
+of the ground state wavefunction in different potentials.",1111.0578v1
+2012-01-26,Topological superfluid in one-dimensional spin-orbit coupled atomic Fermi gases,"ARC Centre of Excellence for Quantum-Atom Optics, Centre for Atom Optics and
+Ultrafast Spectroscopy, Swinburne University of Technology, Melbourne 3122,
+Australia",1201.5663v1
+2020-01-01,Ernest Henley and the shape of baryons,"Calculations of pion-baryon couplings, baryon quadrupole and octupole
+moments, baryon spin and orbital angular momentum done in collaboration with
+Ernest Henley are reviewed. A common theme of this work is the shape of
+baryons. Also, a personal account of my work with Ernest Henley during the
+period 1999-2013 is given.",2001.00203v1
+2019-08-29,Non-Abelian geometric potentials and spin-orbit coupling for periodically driven systems,"We demonstrate the emergence of the non-Abelian geometric potentials and thus
+the three-dimensional (3D) spin-orbit coupling (SOC) for ultracold atoms
+without using the laser beams. This is achieved by subjecting an atom to a
+periodic perturbation which is the product of a position-dependent Hermitian
+operator $\hat{V}\left(\mathbf{r}\right)$ and a fast oscillating periodic
+function $f\left(\omega t\right)$ with a zero average. To have a significant
+spin-orbit coupling (SOC), we analyze a situation where the characteristic
+energy of the periodic driving is not necessarily small compared to the driving
+energy $\hbar\omega$. Applying a unitary transformation to eliminate the
+original periodic perturbation, we arrive at a non-Abelian (non-commuting)
+vector potential term describing the 3D SOC. The general formalism is
+illustrated by analyzing the motion of an atom in a spatially inhomogeneous
+magnetic field oscillating in time. A cylindrically symmetric magnetic field
+provides the SOC involving the coupling between the spin $\mathbf{F}$ and all
+three components of the orbital angular momentum (OAM) $\mathbf{L}$. In
+particular, the spherically symmetric monopole-type synthetic magnetic field
+$\mathbf{B}\propto\mathbf{r}$ generates the 3D SOC of the $\mathbf{L}\cdot
+\mathbf{F}$ form, which resembles the fine-structure interaction of hydrodgen
+atom. However, the strength of the SOC here goes as $1/r^{2}$ for larger
+distances, instead of $1/r^3$ as in atomic fine structure. Such a longer-ranged
+SOC significantly affects not only the lower states of the trapped atom, but
+also the higher ones. Furthermore, by properly tailoring the external trapping
+potential, the ground state of the system can occur at finite OAM, while the
+ground state of hydrogen atom has zero OAM.",1908.11275v3
+2016-10-29,Nodal lines and nodal loops in non-symmorphic odd-parity superconductors,"We discuss the nodal structure of odd-parity superconductors in the presence
+of non-symmorphic crystal symmetries, both with and without spin-orbit
+coupling, and with and without time reversal symmetry. We comment on the
+relation of our work to previous work in the literature, and also the
+implications for unconventional superconductors such as UPt$_3$.",1610.09510v2
+2021-03-15,Linear magnetoconductivity in magnetic metals,"We theoretically describe a mechanism of low-field linear magnetoconductivity
+in helical magnetic metals. Two ingredients for the mechanism in
+three-dimensional metals are identified to be the spin-orbit coupling and
+momentum-dependent ferromagnetic exchange interaction. We propose and study a
+number of minimal theoretical models which have linear magnetoconductivity, and
+discuss their implications for recent experiments.",2103.08503v2
+2021-08-11,Symmetry-enforced topological band crossings in orthorhombic crystals: Classification and materials discovery,"We identify all symmetry-enforced band crossings in nonmagnetic orthorhombic
+crystals with and without spin-orbit coupling and discuss their topological
+properties. We find that orthorhombic crystals can host a large number of
+different band degeneracies, including movable Weyl and Dirac points with
+hourglass dispersions, fourfold double Weyl points, Weyl and Dirac nodal lines,
+almost movable nodal lines, nodal chains, and topological nodal planes.
+Interestingly, spin-orbit coupled materials in the space groups 18, 36, 44, 45,
+and 46 can have band pairs with only two Weyl points in the entire Brillouin
+zone. This results in a simpler connectivity of the Fermi arcs and more
+pronounced topological responses than in materials with four or more Weyl
+points. In addition, we show that the symmetries of the space groups 56, 61,
+and 62 enforce nontrivial weak $\mathbb{Z}_2$ topology in materials with strong
+spin-orbit coupling, leading to helical surface states. With these
+classification results in hand, we perform extensive database searches for
+orthorhombic materials crystallizing in the relevant space groups. We find that
+Sr$_2$Bi$_3$ and Ir$_2$Si have bands crossing the Fermi energy with a
+symmetry-enforced nontrivial $\mathbb{Z}_2$ invariant, CuIrB possesses nodal
+chains near the Fermi energy, Pd$_7$Se$_4$ and Ag$_2$Se exhibit fourfold double
+Weyl points, the latter one even in the absence of spin-orbit coupling, whereas
+the fourfold degeneracies in AuTlSb are made up from intersecting nodal lines.
+For each of these examples we compute the ab-initio band structures, discuss
+their topologies, and for some cases also calculate the surface states.",2108.05375v1
+2021-09-17,Symmetries of the Schroedinger-Pauli equations for charged particles and quasirelativistic Schroedinger equations,"Lie symmetries of the Schroedinger-Pauli equations for charged particles and
+quasirelativistic Schroedinger equations are classified. In particular a new
+superintegrable system with spin-orbit coupling is discovered.",2109.08528v2
+2023-11-18,Edelstein effect and supercurrent diode effect,"We self-consistently calculate the supercurrent diode effect from microscopic
+models of quasi one- and two-dimensional clean superconductors with spin-orbit
+coupling under external Zeeman fields, and show that the Edelstein effect is
+responsible for the supercurrent diode effect. In turn, the supercurrent diode
+effect may serve as a direct measurement of the Edelstein effect as its
+application.",2311.11087v1
+2024-02-05,Topological metal and high-order Dirac point in cubic Rashba model,"We investigate the properties of the two-dimensional model with Rashba-type
+spin-orbit coupling cubic in electron momentum. In the normal phase, edge
+states emerge on open boundaries. In the superconducting phase, edge states
+could evolve into gapped fermionic edge states. Applications to realistic
+materials of interface superconductors are also discussed.",2402.03005v1
+2000-01-18,Spin-orbit interaction in Hartree-Fock calculations,"The contribution of the spin-orbit interaction in Hartree-Fock calculations
+for closed shell nuclei is studied. We obtain explicit expressions for the
+finite range spin-orbit force. New terms with respect to the traditional
+spin-orbit expressions are found. The importance of the finite-range is
+analyzed. Results obtained with spin-orbit terms taken from realistic
+interactions are presented. The effect of the spin-orbit isospin dependent
+terms is evaluated.",0001031v1
+2021-02-15,"Post-Keplerian obliquity variations and the habitability of rocky planets orbiting fast spinning, oblate late M dwarfs","A couple of dozen Earth-like planets orbiting M dwarfs have been discovered
+so far. Some of them have attracted interest because of their potential
+long-term habitability; such a possibility is currently vigorously debated in
+the literature. I show that post-Keplerian (pK) orbit precessions may impact
+the habitability of a fictitious telluric planet orbiting an oblate late-type M
+dwarf of spectral class M9V with $M_\star=0.08\,M_\odot$ at
+$a=0.02\,\mathrm{au}$, corresponding to an orbital period $P_\mathrm{b}\simeq
+4\,\mathrm{d}$, inducing long-term variations of the planetary obliquity
+$\varepsilon$ which, under certain circumstances, may not be deemed as
+negligible from the point of view of life's sustainability. I resume the
+analytical orbit-averaged equations of the pK precessions, both classical and
+general relativistic, of the unit vectors
+$\boldsymbol{\hat{S}},\,\boldsymbol{\hat{h}}$ of both the planet's spin and
+orbital angular momenta $\boldsymbol S,\,\boldsymbol{L}$ entering
+$\varepsilon$, and numerically integrate them by producing time series of the
+pK changes $\Delta\varepsilon(t)$ of the obliquity. For rapidly rotating M
+dwarfs with rotational periods of the order of $P_\star \simeq
+0.1-1\,\mathrm{d}$, the planet's obliquity $\varepsilon$ can undergo classical
+pK large variations $\Delta\varepsilon(t)$ up to tens of degrees over
+timescales $\Delta t \simeq 20-200\,\mathrm{kyr}$, depending on the mutual
+orientations of the star's spin ${\boldsymbol J}_\star$, of $\boldsymbol S$,
+and of $\boldsymbol L$. Instead, $\Delta\varepsilon(t)$ are $\lesssim
+1-1.5^\circ$ for the planet b of the Teegarden's Star. In certain
+circumstances, the M dwarf's oblateness $J_2^\star$ should be considered as one
+of the key dynamical features to be taken into account in compiling budgets of
+the long-term habitability of rocky planets around fast spinning late M dwarfs.
+(Abridged)",2102.07815v2
+2017-06-07,Star-planet interactions. IV. Possibility of detecting the orbit-shrinking of a planet around a red giant,"The surface rotations of some red giants are so fast that they must have been
+spun up by tidal interaction with a close companion, either another star, a
+brown dwarf, or a planet. We focus here on the case of red giants that are spun
+up by tidal interaction with a planet. When the distance between the planet and
+the star decreases, the spin period of the star decreases, the orbital period
+of the planet decreases, and the reflex motion of the star increases. We study
+the change rate of these three quantities when the circular orbit of a planet
+of 15 M$_{J}$ that initially orbits a 2 M$_\odot$ star at 1 au shrinks under
+the action of tidal forces during the red giant phase. We use stellar evolution
+models coupled with computations of the orbital evolution of the planet, which
+allows us to follow the exchanges of angular momentum between the star and the
+orbit in a consistent way. We obtain that the reflex motion of the red giant
+star increases by more than 1 m s$^{-1}$ per year in the last $\sim$40 years
+before the planet engulfment. During this phase, the reflex motion of the star
+is between 660 and 710 m s$^{-1}$. The spin period of the star increases by
+more than about 10 minutes per year in the last 3000 y before engulfment.
+During this period, the spin period of the star is shorter than 0.7 year.
+During this same period, the variation in orbital period, which is shorter than
+0.18 year, is on the same order of magnitude. Changes in reflex-motion and spin
+velocities are very small and thus most likely out of reach of being observed.
+The most promising way of detecting this effect is through observations of
+transiting planets, that is, through{\it } changes of the beginning or end of
+the transit. A space mission like PLATO might be of great interest for
+detecting planets that are on the verge of being engulfed by red giants.",1706.02234v1
+2004-10-15,Suppression of spin-orbit effects in 1D system,"We report the absence of spin effects such as spin-galvanic effect, spin
+polarization and spin current under static electric field and
+inter-spin-subband absorption in 1D system with spin-orbit interaction of
+arbitrary form. It was also shown that the accounting for the direct
+interaction of electron spin with magnetic field violates this statement.",0410393v1
+1993-03-03,Van Hove Excitons and High-T$_c$ Superconductivity: VIIIC Dynamic Jahn-Teller Effects vs Spin-Orbit Coupling in the LTO Phase of La$_{2-x}$Sr$_x$CuO$_4$,"The possible role of the van Hove singularity (vHs) in stabilizing the
+low-temperature orthorhombic (LTO) phase transition in
+La$_{2-x}$\-Sr$_x$\-CuO$_ 4$ (LSCO) is discussed. It is found that the vHs can
+drive a structural distortion in two different ways, either due to spin-orbit
+coupling or to dynamic Jahn-Teller (JT) effects. This paper discusses the
+latter effect in some detail. It is shown that a model Hamiltonian introduced
+earlier to describe the coupled electron -- octahedral tilt motions (`cageons')
+has a series of phase transitions, from a high-temperature disordered JT phase
+(similar to the high-temperature tetragonal phase of LSCO) to an intermediate
+temperature dynamic JT phase, of average orthorhombic symmetry (the LTO phase)
+to a low temperature static JT phase (the low temperature tetragonal phase).
+For some parameter values, the static JT phase is absent.",9303020v1
+2006-01-04,Prospect for room temperature tunneling anisotropic magnetoresistance effect: density of states anisotropies in CoPt systems,"Tunneling anisotropic magnetoresistance (TAMR) effect, discovered recently in
+(Ga,Mn)As ferromagnetic semiconductors, arises from spin-orbit coupling and
+reflects the dependence of the tunneling density of states in a ferromagnetic
+layer on orientation of the magnetic moment. Based on ab initio relativistic
+calculations of the anisotropy in the density of states we predict sizable TAMR
+effects in room-temperature metallic ferromagnets. This opens prospect for new
+spintronic devices with a simpler geometry as these do not require
+antiferromagnetically coupled contacts on either side of the tunnel junction.
+We focus on several model systems ranging from simple hcp-Co to more complex
+ferromagnetic structures with enhanced spin-orbit coupling, namely bulk and
+thin film L1$_0$-CoPt ordered alloys and a monatomic-Co chain at a Pt surface
+step edge. Reliability of the predicted density of states anisotropies is
+confirmed by comparing quantitatively our ab initio results for the
+magnetocrystalline anisotropies in these systems with experimental data.",0601071v1
+2008-06-23,Low energy excitations in CoO studied by temperature dependent x-ray absorption spectroscopy,"We have measured the intricate temperature dependence of the Co L2,3 x-ray
+absorption spectra (2p-3d excitations) of CoO. To allow for accurate total
+electron yield measurements, the material has been grown in thin film form on a
+metallic substrate in order to avoid charging problems usually encountered
+during electron spectroscopic studies on bulk CoO samples. The changes in
+spectra due to temperature are in good agreement with detailed ligand-field
+calculations indicating that these changes are mostly due to thermal population
+of closely lying excited states, originating from degenerate t2g levels lifted
+by the spin-orbit coupling. Magnetic coupling in the ordered phase, modeled as
+a mean-field exchange field, mixes in excited states inducing a tetragonal
+charge density. The spin-orbit coupling induced splitting of the low energy
+states results in a non-trivial temperature dependence for the magnetic
+susceptibility.",0806.3736v1
+2011-03-06,"The Influence of Magnetic Anisotropy on the Kondo Effect and Spin-Polarized Transport through Magnetic Molecules, Adatoms and Quantum Dots","Transport properties in the Kondo regime of a nanosystem displaying uniaxial
+magnetic anisotropy (such as a magnetic molecule, magnetic adatom or quantum
+dot coupled to a localized magnetic moment) are analyzed theoretically. In
+particular, the influence of spin-polarized transport through a local orbital
+of the system and exchange coupling of conduction electrons to the system's
+magnetic core on the Kondo effect is discussed. The numerical renormalization
+group method is applied to calculate the spectral functions and linear
+conductance in the case of the parallel and antiparallel configurations of the
+electrodes' magnetic moments. It is shown that both the magnetic anisotropy as
+well as the exchange coupling between electrons tunneling through the
+conducting orbital and magnetic core play an important role in formation of the
+Kondo resonance, leading generally to its suppression. Specific transport
+properties of such a system appear also as a nontrivial behavior of tunnel
+magnetoresistance. It is also shown that the Kondo effect can be restored by an
+external magnetic field in both the parallel and antiparallel magnetic
+configurations.",1103.1128v2
+2011-06-14,Majorana Zero Modes in 1D Quantum Wires Without Long-Ranged Superconducting Order,"We show that long-ranged superconducting order is not necessary to guarantee
+the existence of Majorana fermion zero modes at the ends of a quantum wire. We
+formulate a concrete model which applies, for instance, to a semiconducting
+quantum wire with strong spin-orbit coupling and Zeeman splitting coupled to a
+wire with algebraically-decaying superconducting fluctuations. We solve this
+model by bosonization and show that it supports Majorana fermion zero modes. We
+argue that a large class of models will also show the same phenomenon. We
+discuss the implications for experiments on spin-orbit coupled nanowires coated
+with superconducting film and for LaAlO3/SrTiO3 interfaces.",1106.2598v3
+2012-06-27,"Evaluation of the importance of spin-orbit couplings in the nonadiabatic quantum dynamics with quantum fidelity and with its efficient ""on-the-fly"" ab initio semiclassical approximation","We propose to measure the importance of spin-orbit couplings (SOCs) in the
+nonadiabatic molecular quantum dynamics rigorously with quantum fidelity. To
+make the criterion practical, quantum fidelity is estimated efficiently with
+the multiple-surface dephasing representation (MSDR). The MSDR is a
+semiclassical method that includes nuclear quantum effects through interference
+of mixed quantum-classical trajectories without the need for the Hessian of
+potential energy surfaces. Two variants of the MSDR are studied, in which the
+nuclei are propagated either with the fewest-switches surface hopping or with
+the locally mean field dynamics. The fidelity criterion and MSDR are first
+tested on one-dimensional model systems amenable to numerically exact quantum
+dynamics. Then, the MSDR is combined with ""on-the-fly"" computed electronic
+structure to measure the importance of SOCs and nonadiabatic couplings (NACs)
+in the photoisomerization dynamics of CH2NH2+ considering 20 electronic states
+and in the collision of F + H2 considering six electronic states.",1206.6299v1
+2012-07-09,Theory of magnetism and metal-insulator transition in layered perovskite iridates,"We investigate the metal-insulator transition in the layered Ruddelsden
+Popper series of strontium iridates Srn+1IrnO3n+1. Tight-binding models of t2g
+orbitals for n = 1, 2, and infinity are constructed, and changes in band
+dispersion due to dimensionality and spin-orbit coupling are presented.
+Identifying the states near the Fermi level to be predominantly Jeff = 1/2, we
+use an effective Hubbard model to study the effect of correlations. Transitions
+from a metallic state to various magnetically ordered states at different
+critical interactions are obtained. A canted antiferromagnetic insulator is
+found for Sr2IrO4, a c-axis collinear antiferromagnetic insulator for Sr3Ir2O7,
+and non-coplanar canted antiferromagnetic insulator via magnetic metal for
+SrIrO3. We derive the strong-coupling spin-model and compare the magnetic
+ordering patterns obtained in the weak and strong coupling limits. We find that
+they are identical, indicating that magnetic ordering is not sufficient to
+justify Mott physics in this series of iridates.",1207.2183v3
+2012-08-24,Stability of Excited Dressed States with Spin-Orbit Coupling,"We study the decay behaviors of ultracold atoms in metastable states with
+spin-orbit coupling (SOC), and demonstrate that there are two SOC-induced decay
+mechanisms. One arises from the trapping potential and the other is due to
+interatomic collision. We present general schemes for calculating decay rates
+from these two mechanisms, and illustrate how the decay rates can be controlled
+by experimental parameters.We experimentally measure the decay rates over a
+broad parameter region, and the results agree well with theoretical
+calculations. This work provides an insight for both quantum simulation
+involving metastable dressed states and studies on few-body problems with SO
+coupling.",1208.4941v2
+2013-01-03,Emergence of Topological and Strongly Correlated Ground States in trapped Rashba Spin-Orbit Coupled Bose Gases,"We theoretically study an interacting few-body system of Rashba spin-orbit
+coupled two-component Bose gases confined in a harmonic trapping potential. We
+solve the interacting Hamiltonian at large Rashba coupling strengths using
+Exact Diagonalization scheme, and obtain the ground state phase diagram for a
+range of interatomic interactions and particle numbers. At small particle
+numbers, we observe that the bosons condense to an array of topological states
+with n+1/2 quantum angular momentum vortex configurations, where n = 0, 1, 2,
+3... At large particle numbers, we observe two distinct regimes: at weaker
+interaction strengths, we obtain ground states with topological and symmetry
+properties that are consistent with mean-field theory computations; at stronger
+interaction strengths, we report the emergence of strongly correlated ground
+states.",1301.0800v1
+2013-07-20,Phase diagrams of voltage-gated oxide interfaces with strong Rashba coupling,"We propose a model for the two-dimensional electron gas formed at the
+interface of oxide heterostructures that includes a Rashba spin-orbit coupling
+proportional to an electric field oriented perpendicularly to the interface.
+Taking into account the electron density dependence of this electric field
+confining the electron gas at the interface, we report the occurrence of a
+phase separation instability (signaled by a negative compressibility) for
+realistic values of the spin-orbit coupling and of the electronic
+band-structure parameters at zero temperature. We extend the analysis to finite
+temperatures and in the presence of an in-plane magnetic field, thereby
+obtaining two phase diagrams which exhibit a phase separation dome. By varying
+the gating potential the phase separation dome may shrink and vanish at zero
+temperature into a quantum critical point where the charge fluctuates
+dynamically. Similarly the phase separation may be spoiled by a planar magnetic
+field even at zero temperature leading to a line of quantum critical points.",1307.5427v3
+2013-11-08,Novel magnetic state in $d^4$ Mott insulators,"We show that the interplay of strong Hubbard interaction $U$ and spin-orbit
+coupling $\lambda$ in systems with $d^4$ electronic configuration leads to
+several unusual magnetic phases. Most notably, we find that competition between
+superexchange and spin-orbit coupling leads to a phase transition from a
+non-magnetic state predicted by atomic physics to a novel magnetic state in the
+large $U$ limit. We show that the local moment changes dramatically across this
+phase transition, challenging the conventional wisdom that local moments are
+robust against small perturbations in a Mott insulator. The Hund's coupling
+plays an important role in determining the nature of the magnetism. We identify
+candidate materials and present predictions for Resonant X-ray Scattering (RXS)
+signatures of the unusual magnetism in $d^4$ Mott insulators.",1311.2823v2
+2013-11-14,Fidelity susceptibility and topological phase transition of a two dimensional spin-orbit coupled Fermi superfluid,"We investigate the fidelity susceptibility (FS) of a two-dimensional
+spin-orbit coupled (SOC) Fermi superfluid and the topological phase transition
+driven by a Zeeman field in the perspective of its ground-state wave-function.
+Without Zeeman coupling, FS shows new features characterizing the BCS-BEC
+crossover induced by SOC. In the presence of a Zeeman field, the topological
+phase transition is explored using both FS and the topological invariant. In
+particular, we obtain the analytical result of the topological invariant which
+explicitly demonstrates that the topological phase transition corresponds to a
+sudden change of the ground state wave-function. Consequently, FS diverges at
+the phase transition point with its critical behavior being: $\chi \propto
+ln|h-h_{c}|$ . Based on this observation, we conclude that the topological
+phase transition can be detected by measuring the momentum distribution in cold
+atoms experiment.",1311.3349v2
+2015-02-25,Tunable spin-orbit coupling synthesized with a modulating gradient magnetic field,"We report the observation of tunable spin-orbit coupling (SOC) for ultracold
+$^{87}$Rb atoms in hyperfine spin-1 states. Different from most earlier
+experiments where atomic SOC of pseudo-spin-1/2 are synthesized with Raman
+coupling lasers, the scheme we demonstrate employs a gradient magnetic field
+(GMF) with ground state atoms and is immune to atomic spontaneous emission. The
+effect of the SOC is confirmed through the studies of: 1) the collective dipole
+oscillation of an atomic condensate in a harmonic trap after the synthesized
+SOC is abruptly turned on; and 2) the minimum energy state at a finite
+adiabatically adjusted momentum when the SOC strength is slowly ramped up. The
+coherence properties of the spinor condensates remain very good after
+interacting with modulating GMFs, which prompts the enthusiastic claim that our
+work provides a new repertoire for synthesized gauge fields aimed at quantum
+simulation studies with cold atoms.",1502.07091v2
+2015-04-20,Raman scattering as a probe of nematic correlations,"We use the symmetry constrained low energy effective Hamiltonian of iron
+based superconductors to study the Raman scattering in the normal state of
+underdoped iron-based superconductors. The incoming and scattered Raman photons
+couple directly to orbital fluctuations and indirectly to the spin
+fluctuations. We computed both couplings within the same low energy model. The
+symmetry constrained Hamiltonian yields the coupling between the orbital and
+spin fluctuations of only the same symmetry type. Attraction in B2g symmetry
+channel was assumed for the system to develop the subleading instability
+towards the discrete in-plane rotational symmetry breaking, referred to as
+Ising nematic transition. We find that upon approaching this instability, the
+Raman spectral function develops a quasi-elastic peak as a function of energy
+transferred by photons to the crystal. We attribute this low-energy B2g
+scattering to the critical slow-down associated with the build up of nematic
+correlations.",1504.05054v2
+2016-06-21,Interplay between spin-orbit coupling and crystal-field effect in topological insulators,"Band inversion, one of the key signatures of time-reversal invariant
+topological insulators (TIs), arises mostly due to the spin-orbit (SO)
+coupling. Here, based on ab initio density-functional calculations, we report a
+theoretical investigation of the SO-driven band inversion in isostructural
+bismuth and antimony chalcogenide TIs from the viewpoint of its interplay with
+the crystal-field effect. We calculate the SO-induced energy shift of states in
+the top valence and bottom conduction manifolds and reproduce this behavior
+using a simple one-atom model adjusted to incorporate the crystal-field effect.
+The crystal-field splitting is shown to compete with the SO coupling, that is,
+stronger crystal-field splitting leads to weaker SO band shift. We further show
+how both these effects can be controlled by changing the chemical composition,
+whereas the crystal-field splitting can be tuned by means of uniaxial strain.
+These results provide a practical guidance to the rational design of novel TIs
+as well as to controlling the properties of existing materials.",1606.06761v1
+2016-09-07,Entanglement-symmetry control in a quantum-dot Cooper-pair splitter,"The control of nonlocal entanglement in solid state systems is a crucial
+ingredient of quantum technologies. We investigate a Cooper-pair splitter based
+on a double quantum dot realised in a semiconducting nanowire. In the presence
+of interdot tunnelling the system provides a simple mechanism to develop
+spatial entanglement even in absence of nonlocal coupling with the
+superconducting lead. We discuss the possibility to control the symmetry
+(singlet or triplet) of spatially separated, entangled electron pairs taking
+advantage of the spin-orbit coupling of the nanowire. We also demonstrate that
+the spin-orbit coupling does not impact over the entanglement purity of the
+nonlocal state generated in the double quantum dot system.",1609.01902v2
+2016-09-26,One- and two-dimensional solitons in PT-symmetric systems emulating the spin-orbit coupling,"We introduce a two-dimensional (2D) system, which can be implemented in
+dual-core planar optical couplers with the Kerr nonlinearity in its cores,
+making it possible to blend effects of the PT symmetry, represented by the
+balanced linear gain and loss in the two cores, and spin-orbit coupling (SOC),
+emulated by a spatially biased coupling between the cores. Families of 1D and
+2D solitons and their stability boundaries are identified. In the 1D setting,
+the addition of the SOC terms leads, at first, to shrinkage of the stability
+area for PT-symmetric solitons, which is followed by its rapid expansion. 2D
+solitons have their stability region too, in spite of the simultaneous action
+of two major destabilizing factors, viz., the collapse driven by the Kerr
+nonlinearity, and a trend towards spontaneous breakup of the gain-loss balance.
+In the limit of the SOC terms dominating over the intrinsic diffraction, the 1D
+system gives rise to a new model for gap solitons, which admits exact
+analytical solutions.",1609.07988v1
+2020-07-16,Spontaneous generation of vortices by a nonuniform Zeeman field in a two-dimensional Rashba coupled superconductor,"The interplay of the electron exchange interaction and spin-orbit coupling
+results in spontaneous supercurrents near magnetic insulator islands, which are
+placed on the top of a two-dimensional (2D) superconductor, and whose
+magnetization is parallel to 2D electron gas. It is shown that in contrast to
+the well studied situation, where such an effect involves only topologically
+trivial spatial variations of the superconducting order parameter, one should
+take into account supercurrent vortices. The latter are spontaneously generated
+around the island's boundary of an arbitrary shape and result in screening of
+the Zeeman field. This problem has been considered for electrons subject to a
+strong Rashba spin-orbit coupling, including Dirac systems as well. In the
+latter case vortices can carry Majorana zero modes.",2007.08276v2
+2020-07-16,Thermal noise effects on the magnetization switching of a ferromagnetic anomalous Josephson junction,"We discuss the effects of thermal noise on the magnetic response of a lateral
+ferromagnetic Josephson junction with spin-orbit coupling and out-of-plane
+magnetization. The direction of the magnetic moment in the ferromagnetic layer
+can be inverted by using controlled current pulses. This phenomenon is due to
+the magnetoelectric effect that couples the flowing charge current and the
+magnetization of the ferromagnet. We investigate the magnetization reversal
+effect versus intrinsic parameters of the ferromagnet, such as the Gilbert
+damping and strength of the spin-orbit coupling. We estimate the magnetization
+reversing time and find the optimal values of the parameters for fast
+switching. With the aim of increasing the operation temperature we study the
+effects induced by thermal fluctuations on the averaged stationary
+magnetization, and find the conditions that make the system more robust against
+noise.",2007.08414v3
+2020-07-27,Josephson oscillations of chirality and identity in two-dimensional solitons in spin-orbit-coupled condensates,"We investigate dynamics of two-dimensional chiral solitons of semi-vortex
+(SV) and mixed-mode (MM) types in spin-orbit-coupled Bose-Einstein condensates
+with the Manakov nonlinearity, loaded in a dual-core (double-layer) trap. The
+system supports two novel manifestations of Josephson phenomenology: one in the
+form of persistent oscillations between SVs or MMs with opposite chiralities in
+the two cores, and another one demonstrating robust periodic switching
+(identity oscillations) between SV in one core and MM in the other, provided
+that the strength of the inter-core coupling exceeds a threshold value. Below
+the threshold, the system creates composite states, which are asymmetric with
+respect to the two cores, or suffer the collapse. Robustness of the chirality
+and identity oscillations against deviations from the Manakov nonlinearity is
+investigated too. These dynamical regimes are possible only in the nonlinear
+system. In the linear one, exact stationary and dynamical solutions for SVs and
+MMs of the Bessel type are found. They sustain Josephson self-oscillations in
+different modes, with no interconversion between them.",2007.13359v1
+2017-01-09,Spin-orbit coupled interferometry with ring-trapped Bose--Einstein condensates,"We propose a method of atom-interferometry using a spinor Bose-Einstein
+condensate (BEC) with a time-varying magnetic field acting as a coherent
+beam-splitter. Our protocol creates long-lived superpositional counterflow
+states, which are of fundamental interest and can be made sensitive to both the
+Sagnac effect and magnetic fields on the sub-micro-G scale. We split a
+ring-trapped condensate, initially in the $m_f=0$ hyperfine state, into
+superpositions of internal $m_f=\pm1$ states and condensate superflow, which
+are spin-orbit coupled. After interrogation, relative phase accumulation can be
+inferred from a population transfer to the $m_f=\pm1$ states. The counterflow
+generation protocol is adiabatically deterministic and does not rely on
+coupling to additional optical fields or mechanical stirring techniques. Our
+protocol can maximise the classical Fisher information for any rotation,
+magnetic field, or interrigation time, and so has the maximum sensitivity
+available to uncorrelated particles. Precision can increase with the
+interrogation time, and so is limited only by the lifetime of the condensate.",1701.02154v2
+2017-01-30,Landau's criterion for an anisotropic Bose-Einstein condensate,"In this work, we discuss the Landau's criterion for anisotropic
+superfluidity. To this end, we consider a point-like impurity moving in a
+uniform Bose-Einstein condensate with either interparticle dipole-dipole
+interaction or Raman induced spin-orbit coupling. In both cases, we find that
+the Landau critical velocity $v_{\rm c}$ is generally smaller than the sound
+velocity in the moving direction. Beyond $v_{\rm c}$, the energy dissipation
+rate is explicitly calculated via a perturbation approach. In the plane-wave
+phase of a spin-orbit coupled Bose gas, the dissipationless motion is
+suppressed by the Raman coupling even in the direction orthogonal to the recoil
+momentum. Our predictions can be tested in the experiments with ultracold
+atoms.",1701.08686v2
+2018-05-08,Phonon-induced Majorana Qubit Relaxation in Tunnel-Coupled Two-Island Topological Superconductors,"A Majorana-based qubit can form within the fermion parity subspace of a
+two-island topological superconductor setup consisting of four Majorana zero
+modes. We study the relaxation time of this Majorana qubit induced by the
+intrinsic Majorana-phonon interaction in combination with single electron
+tunneling between the two islands. The theory is developed for both the
+spinless p-wave Kitaev chain model and the spin-orbit-coupled semiconductor
+nanowire with induced superconductivity and Zeeman splitting. We systematically
+discuss the dependence of the relaxation rate on Majorana charge distribution
+(varying with the chemical potential, magnetic field, superconducting paring,
+spin-orbit coupling and island length) as well as on phonon wavelength and the
+length of the tunnel barrier. Importantly, the accompanied phonon energy can be
+tuned by the voltage bias over the tunnel barrier, leading to relatively easy
+manipulation and suppression of the relaxation rate.",1805.03213v2
+2018-05-09,Scattering of solitons in binary Bose-Einstein condensates with spin-orbit and Rabi couplings,"In this paper we study the scattering of solitons in a binary Bose-Einstein
+Condensate (BEC) including SO- and Rabi-couplings. To this end, we derive a
+reduced ODE model in view to provide a variational description of the
+collisional dynamics. Also, we assume negative intra- and inter-component
+interaction strengths, such that one obtains localized solutions even in
+absence of external potentials. By performing extensive numerical simulations
+of this model we observe that, for specific conditions, the final propagation
+velocity of the scattered solitons could be highly sensitive to small changes
+in the initial conditions, being a possible signature of chaos. Additionally,
+there are infinitely many intervals of regularity emerging from the obtained
+chaotic-like regions and forming a fractal-like structure of
+reflection/transmission windows. Finally, we investigate how the value of the
+spin-orbit coupling strength changes the critical velocities, which are
+minimum/maximum values for the occurrence of solitons bound-states, as well as
+the fractal-like structure.",1805.03340v1
+2014-05-12,Exciton Condensates in Double Quantum Wells: A Laboratory for nontrivial topologies and unconventional superconductivity,"It is shown that exciton condensates exhibit an incredible richness in the
+role that fundamental symmetries play whether manifest or broken. We
+investigate the appearance of the singlet and the triplet excitonic condensates
+under spin-orbit coupling (SOC) and consider realistic couplings to the
+radiation field as manipulated by the fundamental symmetries related to spin,
+time, orbital and particle degrees of freedom. The role of the strong SOC in
+inducing a ground state with coexisting singlet and triplet components is
+shown. It is also shown that the ground state of an excitonic condensate, in
+the realistic senario of spontaneous coupling to the radiation field, is
+dominated by a dark component transparent to photoluminescence.",1405.2829v1
+2016-05-07,Superfluid Density of a Spin-orbit Coupled Bose Gas,"We discuss the superfluid properties of a Bose-Einstein condensed gas with
+spin-orbit coupling, recently realized in experiments. We find a finite normal
+fluid density $\rho_n$ at zero temperature which turns out to be a function of
+the Raman coupling. In particular, the entire fluid becomes normal at the
+transition point from the zero momentum to the plane wave phase, even though
+the condensate fraction remains finite. We emphasize the crucial role played by
+the gapped branch of the elementary excitations and discuss its contributions
+to various sum rules. Finally, we prove that an independent definition of
+superfluid density $\rho_s$, using the phase twist method, satisfies the
+equality $\rho_n+\rho_s=\rho$, the total density, despite the breaking of
+Galilean invariance.",1605.02136v1
+2016-05-08,Dirac-Kondo semimetals and topological Kondo insulators in the dilute carrier limit,"Heavy fermion systems contain not only strong electron correlations, which
+promote a rich set of quantum phases, but also a large spin-orbit coupling,
+which tends to endow the electronic states a topological character. Kondo
+insulators are understood in terms of a lattice of local moments coupled to
+conduction electrons in a half-filled band, i.e., with a dense population of
+about one electron per unit cell. Here, we propose that a new class of Kondo
+insulator arises when the conduction-electron band is nearly empty ( or,
+equivalently, full ) . We demonstrated the effect through a honeycomb Anderson
+lattice model. In the empty carrier limit, spin-orbit coupling produces a gap
+in the hybridized heavy fermion band, thereby generating a topological Kondo
+insulator. This state can be understood in terms of a nearby phase in the
+overall phase diagram, a Dirac-Kondo semimetal whose quasiparticle excitations
+exhibit a non-trivial Berry phase. Our results point to the dilute carrier
+limit of the heavy-fermion systems as a new setting to study strongly
+correlated insulating and topological states.",1605.02380v1
+2016-08-01,Double quantum dot Cooper-pair splitter at finite couplings,"We consider the sub-gap physics of a hybrid double-quantum dot Cooper-pair
+splitter with large single-level spacings, in the presence of tunnelling
+between the dots and finite Coulomb intra- and inter-dot Coulomb repulsion. In
+the limit of a large superconducting gap, we treat the coupling of the dots to
+the superconductor exactly. We employ a generalized master-equation method
+which easily yields currents, noise and cross-correlators. In particular, for
+finite inter- and intra-dot Coulomb interaction, we investigate how the
+transport properties are determined by the interplay between local and nonlocal
+tunneling processes between the superconductor and the dots. We examine the
+effect of inter-dot tunneling on the particle-hole symmetry of the currents
+with and without spin-orbit interaction. We show that spin-orbit interaction in
+combination with finite Coulomb energy opens the possibility to control the
+nonlocal entanglement and its symmetry (singlet/triplet). We demonstrate that
+the generation of nonlocal entanglement can be achieved even without any direct
+nonlocal coupling to the superconducting lead.",1608.00504v1
+2017-12-23,Band resolved imaging of photocurrent in a topological insulator,"We study the microscopic origins of photocurrent generation in the
+topological insulator Bi$_2$Se$_3$ via time- and angle-resolved photoemission
+spectroscopy. We image the unoccupied band structure as it evolves following a
+circularly polarized optical excitation and observe an asymmetric electron
+population in momentum space, which is the spectroscopic signature of a
+photocurrent. By analyzing the rise times of the population we identify which
+occupied and unoccupied electronic states are coupled by the optical
+excitation. We conclude that photocurrents can only be excited via resonant
+optical transitions coupling to spin-orbital textured states. Our work provides
+a microscopic understanding of how to control photocurrents in systems with
+spin-orbit coupling and broken inversion symmetry.",1712.08694v2
+2018-01-16,From Nodal Ring Topological Superfluids to Spiral Majorana Modes in Cold Atomic Systems,"In this work, we consider a 3D cubic optical lattice composed of coupled 1D
+wires with 1D spin-orbit coupling. When the s-wave pairing is induced through
+Feshbach resonance, the system becomes a topological superfluid with ring
+nodes, which are the ring nodal degeneracies in the bulk, and supports a large
+number of surface Majorana zero energy modes. The large number of surface
+Majorana modes remain at zero energy even in the presence of disorder due to
+the protection from a chiral symmetry. When the chiral symmetry is broken, the
+system becomes a Weyl topological superfluid with Majorana arcs. With 3D
+spin-orbit coupling, the Weyl superfluid becomes a novel gapless phase with
+spiral Majorana modes on the surface. The spatial resolved radio frequency
+spectroscopy is suggested to detect this novel nodal ring topological
+superfluid phase.",1801.05182v1
+2020-02-13,Low-loss two-dimensional plasmon modes in antimonene,"The effects of spin-orbit (SOC) and electron-phonon coupling on the
+collective excitation of doped monolayer Sb$_2$ are investigated using density
+functional and many-body perturbation theories. The spin-orbit coupling is
+exclusively important for the monolayer Sb$_2$ and it leads to the
+reconstruction of the electronic band structure. In particular, plasmon modes
+of monolayer Sb$_2$ are quite sensitive to the SOC and are characterized by
+very low damping rates owing to small electron-phonon scatterings. Our results
+show plasmons in antimonene are significantly less damped compared to monolayer
+graphene when plasmon energies are $\hbar \omega> 0.2$ eV due to smaller
+plasmon-phonon coupling in the former material.",2002.05302v1
+2020-04-05,Phase diagrams of tunable spin-orbit coupled Bose-Einstein condensates,"We analytically calculate phase boundaries of tunable spin-orbit coupled BECs
+with effective two-body interactions by using variational method. Phase
+diagrams for periodically driving $^{87}\rm{Rb}$ and $^{23}\rm{Na}$ systems are
+presented, respectively, which display several characteristic features contrast
+with those of undriven systems. In the $^{87}\rm{Rb}$ BECs, the critical
+density $n_{c}$ (density at quantum tricritical point) can be dramatically
+reduced in some parameter regions, thus the prospect of observing this
+intriguing quantum tricritical point is greatly enlarged. Moreover, a series of
+quantum tricritical points emerge quasi-periodically with increasing the Raman
+coupling strength for fixed $^{87}\rm{Rb}$ density. In the $^{23}\rm{Na}$ BECs,
+two hyperfine states of $^{23}\rm{Na}$ atoms can be miscible due to driving
+under proper parameters. As a result, $^{23}\rm{Na}$ systems can stay in the
+stripe phase with small Raman frequency at typical density. This expands the
+region of stripe phase in the phase diagram. In addition, there is no quantum
+tricritical point in such $^{23}\rm{Na}$ system , which is different from
+$^{87}\rm{Rb}$ system.",2004.02063v1
+2018-06-01,Effect of distance on photoluminescence quenching and proximity-induced spin-orbit coupling in graphene-WSe2 heterostructures,"Spin-orbit coupling (SOC) in graphene can be greatly enhanced by proximity
+coupling it to transition metal dichalcogenides (TMDs) such as WSe2. We find
+that the strength of the acquired SOC in graphene depends on the stacking order
+of the heterostructures when using hexagonal boron nitride (h-BN) as the
+capping layer, i.e., SiO2/graphene/WSe2/h-BN exhibiting stronger SOC than
+SiO2/WSe2/graphene/h-BN. We utilize photoluminescence (PL) as an indicator to
+characterize the interaction between graphene and monolayer WSe2 grown by
+chemical vapor deposition. We observe much stronger PL quenching in the
+SiO2/graphene/WSe2/h-BN stack than in the SiO2/WSe2/graphene/h-BN stack, and
+correspondingly a much larger weak antilocalization (WAL) effect or stronger
+induced SOC in the former than in the latter. We attribute these two effects to
+the interlayer distance between graphene and WSe2, which depends on whether
+graphene is in immediate contact with h-BN. Our observations and hypothesis are
+further supported by first-principles calculations which reveal a clear
+difference in the interlayer distance between graphene and WSe2 in these two
+stacks.",1806.00501v1
+2019-11-17,Ideal Weyl semimetal with 3D spin-orbit coupled ultracold quantum gas,"There is an immense effort in search for various types of Weyl semimetals, of
+which the most fundamental phase consists of the minimal number of i.e. two
+Weyl points, but is hard to engineer in solids. Here we demonstrate how such
+fundamental Weyl semimetal can be realized in a maneuverable optical Raman
+lattice, with which the three-dimensional (3D) spin-orbit (SO) coupling is
+synthesised for ultracold atoms. In addition, a new novel Weyl phase with
+coexisting Weyl nodal points and nodal ring is also predicted here, and is
+shown to be protected by nontrivial linking numbers. We further propose
+feasible techniques to precisely resolve 3D Weyl band topology through 2D
+equilibrium and dynamical measurements. This work leads to the first
+realization of the most fundamental Weyl semimetal band and the 3D SO coupling
+for ultracold quantum gases, which are respectively the significant issues in
+the condensed matter and ultracold atom physics.",1911.07169v2
+2020-05-29,Bound states of spin-orbit coupled cold atoms in a Dirac delta-function potential,"Dirac delta-function potential is widely studied in quantum mechanics because
+it usually can be exactly solved and at the same time is useful in modeling
+various physical systems. Here we study a system of delta-potential trapped
+spinorbit coupled cold atoms. The spin-orbit coupled atomic matter wave has two
+kinds of evanescent modes, one of which has pure imaginary wavevector and is an
+ordinary evanescent wave; while the other with a complex number wave vector is
+recognized as oscillating evanescent wave. We identified the eigenenergy
+spectra and the existence of bound states in this system. The bound states can
+be constructed analytically using the two kinds of evanescent modes and we
+found that they exhibit typical features of stripe phase, separated phase or
+zero-momentum phase. In addition to that, the properties of semi-bound states
+are also discussed, which is a localized wave packet on a plane wave
+background.",2005.14604v1
+2020-08-27,Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4,"$\rm Sr_2IrO_4$ is an archetypal spin-orbit-coupled Mott insulator and has
+been extensively studied in part because of a wide range of predicted novel
+states. Limited experimental characterization of these states thus far brings
+to light the extraordinary susceptibility of the physical properties to the
+lattice, particularly, the Ir-O-Ir bond angle. Here, we report a newly observed
+microscopic rotation of the IrO$_6$ octahedra below 50~K measured by single
+crystal neutron diffraction. This sharp lattice anomaly provides keys to
+understanding the anomalous low-temperature physics and a direct confirmation
+of a crucial role that the Ir-O-Ir bond angle plays in determining the ground
+state. Indeed, as also demonstrated in this study, applied electric current
+readily weakens the antiferromagnetic order via the straightening of the
+Ir-O-Ir bond angle, highlighting that even slight change in the local structure
+can disproportionately affect the physical properties in the spin-orbit-coupled
+system.",2008.12355v1
+2021-04-15,Magnetotransport of Functional Oxide Heterostructures Affected by Spin-Orbit Coupling: A Tale of Two-Dimensional Systems,"Oxide heterostructures allow for detailed studies of 2D electronic transport
+phenomena. Herein, different facets of magnetotransport in selected
+spin-orbit-coupled systems are analyzed and characterized by their single-band
+and multiband behavior, respectively. Experimentally, temperature- and magnetic
+field-dependent measurements in the single-band system BaPbO$_3$/SrTiO$_3$
+reveal strong interplay of weak antilocalization (WAL) and electron-electron
+interaction (EEI). Within a scheme which treats both, WAL and EEI, on an equal
+footing a strong contribution of EEI at low temperatures is found which
+suggests the emergence of a strongly correlated ground state. Furthermore, now
+considering multiband effects as they appear, e.g., in the model system
+LaAlO$_3$/SrTiO$_3$, theoretical investigations predict a huge impact of
+filling on the topological Hall effect in systems with intermingled bands.
+Already weak band coupling produces striking deviations from the well-known
+Hall conductivity that are explainable in a fully quantum mechanical treatment
+which builds upon the hybridization of intersecting Hofstadter bands.",2104.07270v2
+2017-07-06,Ground state properties of a two dimensional Fermi superfluid with an anisotropic spin-orbit coupling,"We performed a theoretical investigation on the ground state properties of a
+two dimensional ultra-cold Fermi superfluid with an anisotropic spin-orbit
+coupling (SOC). In the absence of Zeeman field, the system evolves from weak
+coupling BCS regime to strongly interacting BEC regime (BCS-BEC crossover) with
+increasing either the two-particle interaction strength or SOC parameters. We
+focused on the behaviors of pairing parameter and density of states (DOS) when
+increasing the anisotropic parameter of the SOC. Surprisingly, we discovered
+that the gap parameter decreases with increasing the anisotropic parameters,
+but the DOS at the Fermi surface shows non-monotonic behavior as a function of
+the anisotropic parameter. In the presence of the Zeeman field, we discussed a
+particular type of topological phase transition by obtaining the analytical
+result of the topological invariant and directly related this quantum phase
+transition with a sudden change of the ground state wave-function. Effects of
+higher partial wave pairing terms on this topological phase transition were
+briefly discussed.",1707.01607v1
+2017-07-13,Spin-orbit coupling and nonlinear modes of the polariton condensate in a harmonic trap,"We consider a model of the exciton-polariton condensate based on a system of
+two Gross-Pitaevskii equations coupled by the second-order differential
+operator, which represents the spin-orbit coupling (SOC) in the system. Also
+included are the linear gain, effective diffusion, nonlinear loss, and the
+standard harmonic-oscillator trapping potential, as well as the Zeeman
+splitting. By means of combined analytical and numerical methods, we identify
+stable two-dimensional modes supported by the nonlinear system. In the absence
+of the Zeeman splitting, these are mixed modes, which combine zero and nonzero
+vorticities in each of the two spinor components, and vortex-antivortex
+complexes. We have also found a range of parameters where the mixed-mode and
+vortex-antivortex states coexist and are simultaneously stable. Sufficiently
+strong Zeeman splitting creates stable semi-vortex states, with vorticities 0
+in one component and 2 in the other.",1707.04107v1
+2017-11-21,Novel spin-orbit coupling driven emergent states in iridate-based heterostructures,"Recent years have seen many examples of how the strong spin-orbit coupling
+(SOC) present in iridates can stabilize new emergent states that are difficult
+or impossible to realize in more conventional materials. In this review we
+outline a representative set of studies detailing how heterostructures based on
+Ruddlesden-Popper (RP) and perovskite iridates can be used to access yet more
+novel physics. Beginning with a short synopsis of iridate thin film growth, the
+effects of the heterostructure morphology on the RP iridates including Sr2IrO4
+and SrIrO3 are discussed. Example studies explore the effects of epitaxial
+strain, laser-excitation to access transient states, topological
+semimetallicity in SrIrO3, 2D magnetism in artificial RP iridates, and
+interfacial magnetic coupling between iridate and neighboring layers. Taken
+together, these works show the fantastic potential for controlled engineering
+of novel quantum phenomena in iridate heterostructures.",1711.07609v1
+2018-10-02,Topological phases of non-symmorphic crystals : Shastry-Sutherland lattice at integer filling,"Motivated by intertwined crystal symmetries and topological phases, we study
+the possible realization of topological insulator in nonsymmorphic crystals at
+integer fillings. In particular, we consider spin orbit coupled electronic
+systems of two-dimensional crystal Shastry-Sutherland lattice at integer
+filling where the gapless line degeneracy is protected by glide reflection
+symmetry. Based on a simple tight-binding model, we investigate how the
+topological insulating phase is stabilized by breaking nonsymmorphic symmetries
+but in the presence of time reversal symmetry and inversion symmetry. In
+addition, we also discuss the regime where Dirac semimetal is stabilized,
+having non trivial $Z_2$ invariants even without spin orbit coupling (SOC). Our
+study can be extended to more general cases where all lattice symmetries are
+broken and we also discuss possible application to topological Kondo insulators
+in nonsymmorphic crystals where crystal symmetries can be spontaneously broken
+as a function of Kondo coupling.",1810.01451v1
+2020-06-16,Stabilization of one-dimensional Townes solitons by spin-orbit coupling in a dual-core system,"It was recently demonstrated that two-dimensional Townes solitons (TSs) in
+two-component systems with cubic self-focusing, which are normally made
+unstable by the critical collapse, can be stabilized by linear spin-orbit
+coupling (SOC), in Bose-Einstein condensates and optics alike. We demonstrate
+that one-dimensional TSs, realized as optical spatial solitons in a planar
+dual-core waveguide with dominant quintic self-focusing, may be stabilized by
+SOC-like terms emulated by obliquity of the coupling between cores of the
+waveguide. Thus, SOC offers a universal mechanism for the stabilization of the
+TSs. A combination of systematic numerical considerations and analytical
+approximations identifies a vast stability area for skew-symmetric solitons in
+the system's main (semi-infinite) and annex (finite) bandgaps. Tilted
+(""moving"") solitons are unstable, spontaneously evolving into robust breathers.
+For broad solitons, diffraction, represented by second derivatives in the
+system, may be neglected, leading to a simplified model with a finite bandgap.
+It is populated by skew-antisymmetric gap solitons, which are nearly stable
+close to the gap's bottom.",2006.09555v1
+2021-02-12,Atom-dimer and dimer-dimer scatterings in a spin-orbit coupled Fermi gas,"Using the diagrammatic approach, here we study how spin-orbit coupling (SOC)
+affects the fermion-dimer and dimer-dimer scattering lengths in the Born
+approximation, and benchmark their accuracy with the higher-order
+approximations. We consider both isotropic and Rashba couplings in three
+dimensions, and show that the Born approximation gives accurate results in the
+$1/(m \alpha a_s) \ll -1$ limit, where $m$ is the mass of the fermions,
+$\alpha$ is the strength of the SOC, and $a_s$ is the $s$-wave scattering
+length between fermions. This is because the higher-loop contributions form a
+perturbative series in the $1/(m \alpha a_s) < 0$ region that is controlled by
+the smallness of the residue $Z$ of the dimer propagator. In sharp contrast,
+since $Z$ grows with the square-root of the binding energy of the dimer in the
+$1/(m \alpha a_s) > 0$ region, all of the higher-loop contributions are of
+similar order.",2102.06730v1
+2021-03-24,Femtosecond Intersystem Crossing in the DNA Nucleobase Cytosine,"Ab initio molecular dynamics including non-adiabatic and spin-orbit couplings
+on equal footing is used to unravel the deactivation of cytosine after UV light
+absorption. Intersystem crossing (ISC) is found to compete directly with
+internal conversion in tens of femtoseconds, thus making cytosine the organic
+compound with the fastest triplet population calculated so far. It is found
+that close degeneracy between singlet and triplet states can more than
+compensate for very small spin-orbit couplings, leading to efficient ISC. The
+femtosecond nature of the intersystem crossing process highlights its
+importance in photochemistry and challenges the conventional view that large
+singlet-triplet couplings are required for an efficient population flow into
+triplet states. These findings are important to understand DNA photostability
+and the photochemistry and dynamics of organic molecules in general.",2103.13070v1
+2021-06-10,Spin-Orbit Coupled Exciton-Polariton Condensates in Lead Halide Perovskites,"Spin-orbit coupling (SOC) is responsible for a range of spintronic and
+topological processes in condensed matter. Here we show photonic analogs of
+SOCs in exciton-polaritons and their condensates in microcavities composed of
+birefringent lead halide perovskite single crystals. The presence of
+crystalline anisotropy coupled with splitting in the optical cavity of the
+transverse electric (TE) and transverse magnetic (TM) modes gives rise to a
+non-Abelian gauge field, which can be described by the Rashba-Dresselhaus
+Hamiltonian near the degenerate points of the two polarization modes. With
+increasing density, the exciton polaritons with pseudospin textures undergo
+phase transitions to competing condensates with orthogonal polarizations.
+Unlike their pure photonic counterparts, these exciton polaritons and
+condensates inherit nonlinearity from their excitonic components and may serve
+as quantum simulators of many-body SOC processes.",2106.06034v2
+2022-01-16,Solitons in $\mathcal{PT}$-symmetric systems with spin-orbit coupling and critical nonlinearity,"We construct families of one-dimensional (1D) stable solitons in
+two-component $\mathcal{PT}$-symmetric systems with spin-orbit coupling (SOC)
+and quintic nonlinearity, which plays the critical role in 1D setups. The
+system models light propagation in a dual-core waveguide with skewed coupling
+between the cores. Stability regions for the solitons are identified in the
+system's parameter space. They include the main semi-infinite gap, and an
+additional finite $\textit{annex gap}$. Stability boundaries are identified by
+means of simulations of the perturbed evolution, which agree with results
+produced by the linear-stability analysis for small perturbations. Distinct
+evolution scenarios are identified for unstable solitons. Generally, they
+suffer blowup or decay, while weakly unstable solitons transform into
+breathers. Due to a regularizing effect of SOC, stationary solitons are also
+found beyond the exceptional point, at which the $\mathcal{PT}$ symmetry breaks
+down, but they are unstable. Interactions between adjacent solitons are
+explored too, featuring rebound or merger followed by blowup. Slowly moving
+(tilted) solitons develop weak oscillations, while fast ones are completely
+unstable. Also considered is the reduced diffractionless system, which creates
+only unstable solitons.",2201.06139v1
+2022-02-11,Pseudopotentials for Two-dimentional Ultracold Scattering in the Presence of Synthetic Spin-orbit-coupling,"We derive a pseudopotential in two dimensions (2D) with the presence of a 2D
+Rashba spin-orbit-coupling (SOC), following the same spirit of frame
+transformation in {[}Phys. Rev. A 95, 020702(R) (2017){]}. The frame
+transformation correctly describes the non-trivial phase accumulation and
+partial wave couplings due to the presence of SOC and gives rise to a different
+pseudopotential than the free-space one, even when the length scale of SOC is
+significantly larger than the two-body potential range. As an application, we
+apply our pseudopotential with the Lippmann-Schwinger equation to obtain an
+analytical scattering matrix. To demonstrate the validity, we compare our
+results with a numerical scattering calculation of finite-range potential and
+show perfect agreement over a wide range of scattering energy and SOC strength.
+Our results also indicate that the differences between our pseudopotential and
+the original free-space pseudopotential are essential to reproduce scattering
+observables correctly.",2202.05431v1
+2022-03-07,Texture-induced spin-orbit coupling and Skyrmion-electron bound states in a Néel antiferromagnet,"We derive effective-mass electron Hamiltonian for a N\'eel antiferromagnet in
+the presence of a smooth texture of the staggered magnetization. For certain
+locations of electron band extrema, the texture produces a peculiar and
+anomalously strong spin-orbit coupling of the scale $\hbar v / L$, with $v$ the
+Fermi velocity and $L$ the characteristic length scale of the texture. For a
+Skyrmion texture, this coupling generates electron bound states, whose energy
+scale is given by the gap $\Delta$ in the electron spectrum. With dopant
+carriers, such bound states turn the Skyrmion into a charged particle, that can
+be manipulated by electric field.",2203.03569v3
+2022-03-15,Imaginary spin-orbital coupling in parity-time symmetric systems with momentum-dependent gain and loss,"Spin-orbital coupling (SOC) and parity-time ($\mathcal{PT}$) symmetry both
+have attracted paramount research interest in condensed matter physics, cold
+atom physics, optics and acoustics to develop spintronics, quantum computation,
+precise sensors and novel functionalities. Natural SOC is an intrinsic
+relativistic effect. However, there is an increasing interest in synthesized
+SOC nowadays. Here, we show that in a $\mathcal{PT}$-symmetric spin-1/2 system,
+the momentum-dependent balanced gain and loss can synthesize a new type of SOC,
+which we call imaginary SOC. The imaginary SOC can substantially change the
+energy spectrum of the system. Firstly, we show that it can generate a pure
+real energy spectrum with a double-valleys structure. Therefore, it has the
+ability to generate supersolid stripe states. Especially, the imaginary SOC
+stripe state can have a high contrast of one. Moreover, the imaginary SOC can
+also generate a spectrum with tunable complex energy band, in which the waves
+are either amplifying or decaying. Thus, the imaginary SOC would also find
+applications in the engineering of $\mathcal{PT}$-symmetry-based coherent wave
+amplifiers/absorbers. Potential experimental realizations of imaginary SOC are
+proposed in cold atomic gases and systems of coupled waveguides constituted of
+nonlocal gain and loss.",2203.07764v1
+2022-06-01,One- and two-dimensional solitons in spin-orbit-coupled Bose-Einstein condensates with fractional kinetic energy,"We address effects of spin-orbit coupling (SOC), phenomenologically added to
+a two-component Bose-Einstein condensate composed of particles moving by Levy
+flights, in one- and two-dimensional (1D and 2D) settings. The corresponding
+system of coupled Gross-Pitaevskii equations includes fractional kinetic-energy
+operators, characterized by the Levy index, \alpha < 2 (the normal kinetic
+energy corresponds to \alpha = 2). The SOC terms, with strength \lambda,
+produce strong effects in the 2D case: they create families of stable solitons
+of the semi-vortex (SV) and mixed-mode (MM) types in the interval of 1 < \alpha
+< 2, where the supercritical collapse does not admit the existence of stable
+solitons in the absence of the SOC. At \lambda --> 0, amplitudes of these
+solitons vanish as (\lambda)^{1/(\alpha - 1)}.",2206.00404v1
+2022-06-02,Control of dimer chain topology by Rashba-Dresselhaus spin-orbit coupling,"We study theoretically a dimer chain in the presence of Rashba-Dresselhaus
+spin-orbit coupling (RDSOC) with equal strength. We show that the RDSOC can be
+described as a synthetic gauge field that controls not only the magnitude but
+also the sign of tunneling coefficients between sites. This allows to emulate
+not only a Su-Schrieffer-Heeger chain which is commonly implemented in various
+platforms, but also, all energy spectra of the transverse field Ising model
+with both ferromagnetic and antiferromagnetic coupling. We simulate a realistic
+implementation of these effective Hamiltonians based on liquid crystal
+microcavities. In that case, the RDSOC can be switched on and off by an applied
+voltage, which controls the band topology, the existence and characteristics of
+topological edge states, or the nature of the ground state. This setting is
+promising for topological photonics applications and from a quantum simulation
+perspective.",2206.01060v1
+2022-07-12,Origin of subgap states in normal-insulator-superconductor van der Waals heterostructures,"Superconductivity in van der Waals materials, such as NbSe$_{2}$ and
+TaS$_{2}$, is fundamentally novel due to the effects of dimensionality, crystal
+symmetries, and strong spin-orbit coupling. In this work we perform tunnel
+spectroscopy on NbSe$_{2}$ by utilizing MoS$_{2}$ or hexagonal Boron Nitride
+(hBN) as a tunnel barrier. We observe subgap excitations and probe their origin
+by studying various heterostructure designs. We show that the edge of
+NbSe$_{2}$ hosts many defect states, which strongly couple to the
+superconductor and form Andreev bound states. Furthermore, by isolating the
+NbSe$_{2}$ edge we show that the subgap states are ubiquitous in MoS$_{2}$
+tunnel barriers, but absent in hBN tunnel barriers, suggesting defects in
+MoS$_{2}$ as their origin. Their magnetic nature reveals a singlet or a doublet
+type ground state and based on nearly vanishing g-factors or avoided-crossing
+of subgap excitations we highlight the role of strong spin-orbit coupling.",2207.05741v1
+2022-11-09,Anisotropic Rashba coupling to polar modes in KTaO3,"Motivated by the discovery of superconductivity in KTaO3-based
+heterostructures, we study a pairing mechanism based on spin-orbit assisted
+coupling between the conduction electrons and the ferroelectric modes present
+in the material. We use ab initio frozen-phonon computations to show a
+linear-in-momentum Rashba-like coupling with a strong angular dependence in
+momentum for the lower j=3/2 manifold, deviating from the conventional
+isotropic Rashba model. This implies the Rashba-like interaction with the polar
+modes has substantial L=3 cubic harmonic corrections, which we quantify for
+each electronic band. The strong anisotropy of the Rashba interaction is
+captured by a microscopic toy model for the t2g electrons. We find its origin
+to be the angular dependence in electronic momentum imposed by the kinetic term
+on the degenerate j=3/2 manifold. A comparison between the toy model and ab
+initio results indicate that additional symmetry allowed terms beyond
+odd-parity spin-conserving inter-orbital hopping processes are needed to
+describe the Rashba-like polar interaction between the electrons and the soft
+ferroelectric mode.",2211.05056v2
+2023-01-18,Chirality Dependent Photon Transport and Helical Superradiance,"Chirality, or handedness, is a geometrical property denoting a lack of mirror
+symmetry. Chirality is ubiquitous in nature and is associated with the
+non-reciprocal interactions observed in complex systems ranging from
+biomolecules to topological materials. Here, we demonstrate that chiral
+arrangements of dipole-coupled atoms or molecules can facilitate the
+unidirectional transport of helical photonic excitations without breaking
+time-reversal symmetry. We show that such helicity dependent transport stems
+from an emergent spin-orbit coupling induced by the chiral geometry, which
+results in nontrivial topological properties. We also examine the effects of
+collective dissipation and find that many-body coherences lead to helicity
+dependent photon emission: an effect we call helical superradiance. Our results
+demonstrate an intimate connection between chirality, topology, and photon
+helicity that may contribute to molecular photodynamics in nature and could be
+probed with near-term quantum simulators.",2301.07231v4
+2023-02-01,Superconductivity from repulsive interactions in Bernal-stacked bilayer graphene,"A striking series of experiments have observed superconductivity in
+Bernal-stacked bilayer graphene (BBG) when the energy bands are flattened by
+applying an electrical displacement field. Intriguingly, superconductivity
+manifests only at non-zero magnetic fields, or when spin-orbit coupling is
+induced in BBG by coupling to a substrate. We present detailed functional
+renormalization group and random-phase approximation calculations that provide
+a unified explanation for the superconducting mechanism in both cases. Both
+calculations yield a purely electronic $p$-wave instability of the
+Kohn-Luttinger (KL) type. The latter can be enhanced either by magnetic fields
+or Ising spin-orbit coupling, naturally explaining the behaviour seen in
+experiments.",2302.00682v2
+2023-06-29,Wannier solitons in spin-orbit-coupled Bose-Einstein condensates in optical lattices with a flat-band,"We investigate families of soliton solutions in a spin-orbit coupled
+Bose-Einstein condensate embedded in an optical lattice, which bifurcate from
+the nearly flat lowest band. Unlike the conventional gap solitons the obtained
+solutions have the shape well approximated by a Wannier function (or a few
+Wannier functions) of the underlying linear Hamiltonian with amplitudes varying
+along the family and with nearly constant widths. The Wannier solitons (WSs)
+sharing all symmetries of the system Hamiltonian are found to be stable. Such
+solutions allow for the construction of Wannier breathers, that can be viewed
+as nonlinearly coupled one-hump solitons. The breathers are well described by a
+few-mode model and manifest stable behavior either in an oscillatory regime
+with balanced average populations or in a self-trapping regime characterized by
+unbalanced atomic populations of the local potential minima (similarly to the
+conventional boson Josephson junction), with the frequencies controlled by the
+inter-atomic interactions.",2306.16813v1
+2023-10-01,High-temperature magneto-inter-chirality oscillations in 2D systems with strong spin-orbit coupling,"Conventional magneto-oscillations of conductivity in three dimensions are
+washed out as the temperature exceeds the spacing between the Landau levels.
+This is due to smearing of the Fermi distribution. In two dimensions, in the
+presence of two or more size-quantization sub-bands, there is an additional
+type of magneto-oscillations, usually referred to as magneto-inter-sub-band
+oscillations, which do not decay exponentially with temperature. The period of
+these oscillations is determined by the condition that the energy separation
+between the sub-bands contains an integer number of Landau levels. Under this
+condition, which does not contain the Fermi distribution, the inter-sub-band
+scattering rate is maximal. Here we show that, with only one sub-band,
+high-temperature oscillations are still possible. They develop when the
+electron spectrum is split due to the spin-orbit coupling. For these additional
+oscillations, the coupling enters both, the period and the decay rate.",2310.00774v1
+2023-11-20,The impact of Rashba spin-orbit coupling in charge-ordered systems,"We study the impact of the Rashba spin-orbit coupling (RSOC) on the stability
+of charge-density wave (CDW) in systems with large electron-phonon coupling
+(EPC). Here, the EPC is considered in the framework of the Holstein model at
+the half-filled square lattice. We start obtaining the phase diagram of the
+Rashba-Holstein model using the Hartree-Fock mean-field theory, and identifying
+the boundaries of the CDW and Rashba metal phases. As our main result, we
+notice that the RSOC disfavors the CDW phase, driving the system to a
+correlated Rashba metal. Proceeding, we employ a cluster perturbation theory
+(CPT) approach to investigate the phase diagram beyond the Hartree-Fock
+approximation. The quantum correlations captured by CPT indicate that the RSOC
+is even more detrimental to CDW than previously anticipated. That is, the
+Rashba metal region is observed to be expanded in comparison to the mean-field
+case. Additionally, we investigate pairing correlations, and the results
+further strengthen the identification of critical points.",2311.11984v1
+2024-02-29,"Topological flat bands, valley polarization, and interband superconductivity in magic-angle twisted bilayer graphene with proximitized spin-orbit couplings","We study theoretically the magic-angle twisted bilayer graphene with
+proximity-induced Ising and Rashba spin-orbit couplings on the top layer. We
+demonstrate topological flat bands and identify three distinct topological
+phases. Using a weak coupling analysis, we find that (partial) valley
+polarization prevails for a wide range of doping, suppressing the usual
+superconductivity with a pairing between time-reversal partners. Remarkably, we
+uncover that observable unconventional intervalley interband phonon-mediated
+superconductivity (with the highest $T_c\approx 1.2$K) can coexist with strong
+valley imbalance due to the approximate Fermi surface nesting between two flat
+bands not related by time-reversal symmetry, and the dominant pairing is an
+intersublattice Ising pairing, corresponding to a mixture of $p$- and
+$d$-waves. In contrast, the intrasublattice Ising phonon-mediated
+superconductivity with $s$- and $f$-wave mixing emerges in the absence of
+valley imbalance. Our work reveals a novel route of realizing unconventional
+superconductivity, and potentially explains the superconductivity phenomenology
+in existing experiments.",2402.19478v1
+2020-01-15,Utilizing Essential Symmetry Breaking in Auxiliary-Field Quantum Monte Carlo: Application to the Spin Gaps of the C$_{36}$ Fullerene and an Iron Porphyrin Model Complex,"We present three distinct examples where phaseless auxiliary-field Quantum
+Monte Carlo (ph-AFQMC) can be reliably performed with a single-determinant
+trial wavefunction with essential symmetry breaking. We first utilized
+essential time-reversal symmetry breaking with ph-AFQMC to compute the
+triplet-singlet energy gap in the TS12 set. We found statistically better
+performance of ph-AFQMC with complex-restricted orbitals than with
+spin-unrestricted orbitals. We then showed the utilization of essential spin
+symmetry breaking when computing the single-triplet gap of a known
+biradicaloid, C$_{36}$. ph-AFQMC with spin-unrestricted Hartree-Fock
+(ph-AFQMC+UHF) fails catastrophically even with spin-projection and predicts no
+biradicaloid character. With approximate Brueckner orbitals obtained from
+regularized orbital-optimized second-order M{\o}ller-Plesset perturbation
+theory ($\kappa$-OOMP2), ph-AFQMC quantitatively captures strong biradicaloid
+character of C$_{36}$. Lastly, we applied ph-AFQMC to the computation of the
+quintet-triplet gap in a model iron porphyrin complex where brute-force methods
+with a small active space fail to capture the triplet ground state. We show
+unambiguously that neither triplet nor quintet is strongly correlated using
+UHF, $\kappa$-OOMP2, and coupled-cluster with singles and doubles (CCSD)
+performed on UHF and $\kappa$-OOMP2 orbitals. There is no essential symmetry
+breaking in this problem. By virtue of this, we were able to perform
+UHF+ph-AFQMC reliably with a cc-pVTZ basis set and predicted a triplet ground
+state for this model geometry. The largest ph-AFQMC in this work correlated 186
+electrons in 956 orbitals. Our work highlights the utility, scalability, and
+accuracy of ph-AFQMC with a single determinant trial wavefunction with
+essential symmetry breaking for systems mainly dominated by dynamical
+correlation with little static correlation.",2001.05109v2
+1997-12-04,Is the magnetic field necessary for the Aharonov-Bohm effect in mesoscopics?,"A new class of topological mesoscopic phenomena in absence of external
+magnetic field (meso-nucleo-spinics)is predicted, which is based on combined
+action of the nonequilibrium nuclear spin population and charge carriers
+spin-orbit interaction . As an example, we show that Aharonov-Bohm like
+oscillations of the persistent current in GaAs/AlGaAs based mesoscopic rings
+may exist, in the absence of the external magnetic field, provided that a
+topologically nontrivial strongly nonequilibrium nuclear spin population is
+created. This phenomenon is due to the breaking, via the spin-orbit coupling,
+of the clock wise - anti clock wise symmetry of the charge carriers momentum,
+which results in the oscillatory in time persistent current.",9712057v1
+2006-07-08,Spin-orbit interaction in symmetric wells with two subbands,"We investigate the spin-orbit (s-o) interaction in two-dimensional electron
+gases (2DEGs) in quantum wells with two subbands. From the $8\times 8$ Kane
+model, we derive a new inter-subband-induced s-o term which resembles the
+functional form of the Rashba s-o -- but is non-zero even in \emph{symmetric}
+structures. This follows from the distinct parity of the confined states
+(even/odd) which obliterates the need for asymmetric potentials. We
+self-consistently calculate the new s-o coupling strength for realistic wells
+and find it comparable to the usual Rashba constant. Our new s-o term gives
+rise to a non-zero ballistic spin-Hall conductivity, which changes sign as a
+function of the Fermi energy ($\epsilon_F$), and can induce an unusual
+\emph{zitterbewegung} with cycloidal trajectories \textit{without} magnetic
+fields.",0607218v2
+2004-01-26,Numerical Models of Spin-Orbital Coupling in Neutron Star Binaries,"We present a new numerical scheme for solving the initial value problem for
+quasiequilibrium binary neutron stars allowing for arbitrary spins. We
+construct sequences of circular-orbit binaries of varying separation, keeping
+the rest mass and circulation constant along each sequence. The spin angular
+frequency of the stars is shown to vary along the sequence, a result that can
+be derived analytically in the PPN limit. This spin effect, in addition to
+leaving an imprint on the gravitational waveform emitted during binary
+inspiral, is measurable in the electromagnetic signal if one of the stars is a
+pulsar visible from Earth.",0401104v1
+2008-09-30,Quantum pumping and rectification effects in Aharonov-Bohm-Casher ring-dot systems,"We study the time-dependent transport of charge and spin through a
+ring-shaped region sequentially coupled to a weakly interacting quantum dot in
+the presence of an Aharonov-Bohm flux and spin-orbit interaction. The
+time-dependent modulation of the spin-orbit interaction, or of the
+corresponding Aharonov-Casher flux, together with the modulation of the
+dot-level induces an electrically pumped spin current even in absence of a
+charge current. The results beyond the adiabatic regime show that an additional
+rectification current proportional to \cos(\phi), being \phi the relative phase
+between the time varying parameters, is generated. We discuss the relevance of
+such term in connection with recent experiments on out-of-equilibrium quantum
+dots.",0809.5246v1
+2009-04-06,Multipole decomposition of LDA+$U$ energy and its application to actinides compounds,"A general reformulation of the exchange energy of $5f$-shell is applied in
+the analysis of the magnetic structure of various actinides compounds in the
+framework of LDA+U method. The calculations are performed in an efficient
+scheme with essentially only one free parameter, the screening length. The
+results are analysed in terms of different polarisation channels, due to
+different multipoles. Generally it is found that the spin-orbital polarisation
+is dominating. This can be viewed as a strong enhancement of the spin-orbit
+coupling in these systems. This leads to a drastic decrease in spin
+polarisation, in accordance with experiments. The calculations are able to
+correctly differentiate magnetic and non-magnetic Pu system. Finally, in all
+magnetic systems a new multipolar order is observed, whose polarisation energy
+is often larger in magnitude than that of spin polarisation.",0904.0742v5
+2010-02-24,Effects of impurities in noncentrosymmetric superconductors,"Effects of disorder on superconducting properties of noncentrosymmetric
+compounds are discussed. Elastic impurity scattering, even for scalar
+impurities, leads to a strongly anisotropic mixing of the electron states in
+the bands split by the spin-orbit coupling. We focus on the calculation of the
+critical temperature, the upper critical field, and the spin susceptibility. It
+is shown that the impurity effects on the critical temperature are similar to
+those in multi-band centrosymmetric superconductors, in particular, Anderson's
+theorem holds for isotropic singlet pairing. In contrast, scalar impurities
+affect the spin susceptibility in the same way as spin-orbit impurities do in
+centrosymmetric superconductors. Another peculiar feature is that in the
+absence of inversion symmetry scalar disorder can mix singlet and triplet
+pairing channels. This leads to significant deviations of the upper critical
+field from the predictions of the Werthamer-Helfand-Hohenberg theory in the
+conventional centrosymmetric case.",1002.4639v1
+2010-11-11,Semiconductor quantum ring as a solid-state spin qubit,"The implementation of a spin qubit in a quantum ring occupied by one or a few
+electrons is proposed. Quantum bit involves the Zeeman sublevels of the highest
+occupied orbital. Such a qubit can be initialized, addressed, manipulated, read
+out and coherently coupled to other quantum rings. An extensive discussion of
+relaxation and decoherence is presented. By analogy with quantum dots, the spin
+relaxation times due to spin-orbit interaction for experimentally accessible
+quantum ring architectures are calculated. The conditions are formulated under
+which qubits build on quantum rings can have long relaxation times of the order
+of seconds. Rapidly improving nanofabrication technology have made such ring
+devices experimentally feasible and thus promising for quantum state
+engineering.",1011.2540v1
+2010-11-26,Spin-orbit interaction and asymmetry effects on Kondo ridges at finite magnetic field,"We study electron transport through a serial double quantum dot with Rashba
+spin-orbit interaction (SOI) and Zeeman field of amplitude B in presence of
+local Coulomb repulsion. The linear conductance as a function of a gate voltage
+Vg equally shifting the levels on both dots shows two B=0 Kondo ridges which
+are robust against SOI as time-reversal symmetry is preserved. Resulting from
+the crossing of a spin-up and a spin-down level at vanishing SOI two additional
+Kondo plateaus appear at finite B. They are not protected by symmetry and
+rapidly vanish if the SOI is turned on. Left-right asymmetric level-lead
+couplings and detuned on-site energies lead to a simultaneous breaking of
+left-right and bonding-anti-bonding state symmetry. In this case the finite-B
+Kondo ridges in the Vg-B plane are bent with respect to the Vg-axis. For the
+Kondo ridge to develop different level renormalizations must be compensated by
+adjusting B.",1011.5916v2
+2012-02-09,Interlayer magnetic frustration driven quantum spin disorder in honeycomb compound In$_{3}$Cu$_{2}$VO$_{9}$,"We present electronic and magnetic properties of a honeycomb compound
+In$_{3}$Cu$_{2}$VO$_{9}$ in this paper. We find that the parent phase is a
+charge transfer insulator with an energy gap of about 1.5 eV. Singly occupied
+d$_{3z^{2}-r^{2}}$ electrons of copper ions contribute an $S$ = 1/2 spin, while
+vanadium ions show nonmagnetism. Oxygen 2$p$ orbitals hybridizing with a small
+fraction of Cu 3$d$ orbitals dominate the density of states near $E_{F}$. The
+planar nearest-neighbor, next-nearest-neighbor and interplane superexchange
+couplings of Cu spins are $J_{1}$ $\approx$ 16.2 meV, $J_{2}$ $\approx$ 0.3 meV
+and $J_{z}$ $\approx$ 1.2 meV, suggesting a low-dimensional antiferromagnet
+\cite{Sondhi10}. We propose that the magnetic frustration along the c-axis
+leads to a quantum spin disorder in In$_{3}$Cu$_{2}$VO$_{9}$, in accordance
+with the recent experiments. {abstract}",1202.1861v3
+2012-07-03,Approximate relativistic bound state solutions of the Tietz-Hua rotating oscillator for any -state,"Approximate analytic solutions of the Dirac equation with Tietz-Hua (TH)
+potential are obtained for arbitrary spin-orbit quantum number using the
+Pekeris approximation scheme to deal with the spin-orbit coupling terms In the
+presence of exact spin and pseudo-spin (pspin) symmetric limitation, the bound
+state energy eigenvalues and associated two-component wave functions of the
+Dirac particle moving in the field of attractive and repulsive TH potential are
+obtained using the parametric generalization of the Nikiforov-Uvarov (NU)
+method. The cases of the Morse potential, the generalized Morse potential and
+non-relativistic limits are studied.",1207.0675v1
+2012-07-25,Full magnetoelectric response of Cr2O3 from first principles,"The linear magnetoelectric response of Cr2O3 at zero temperature is
+calculated from first principles by tracking the change in magnetization under
+a macroscopic electric field. Both the spin and the orbital contributions to
+the induced magnetization are computed, and in each case the response is
+decomposed into lattice and electronic parts. We find that the transverse
+response is dominated by the spin-lattice and spin-electronic contributions,
+whose calculated values are consistent with static and optical magnetoelectric
+measurements. In the case of the longitudinal response, orbital contributions
+dominate over spin contributions, but the net calculated longitudinal response
+remains much smaller than the experimentally measured one at low temperatures.
+We also discuss the absolute sign of the magnetoelectric coupling in the two
+time-reversed magnetic domains of Cr2O3.",1207.5873v2
+2012-10-10,Rashba spin-orbit interaction in graphene armchair nanoribbons,"We study graphene nanoribbons (GNRs) with armchair edges in the presence of
+Rashba spin-orbit interaction (RSOI). We impose the boundary conditions on the
+tight binding Hamiltonians for bulk graphene with RSOI by means of a sine
+transform and study in detail the influence of RSOI on the spectra and the spin
+polarization. We show that the spin polarization perpendicular to the GNR
+changes sign when reversing the momentum along the GNR if the bands are coupled
+by strong RSOI. Furthermore, we derive a linearized approximation to the RSOI
+Hamiltonian and find that only the neighboring modes of an energy band have to
+be taken into account in order to achieve a good approximation for the same
+band. Due to their experimental availability and various proposals for
+engineering appropriate RSOI, GNRs with armchair edges are a promising
+candidate for possible spintronics applications.",1210.2865v3
+2013-03-21,"Co monolayers and adatoms on Pd(100), Pd(111) and Pd(110): Anisotropy of magnetic properties","We investigate to what extent the magnetic properties of deposited
+nanostructures can be influenced by selecting as a support different surfaces
+of the same substrate material. Fully relativistic ab initio calculations were
+performed for Co monolayers and adatoms on Pd(100), Pd(111), and Pd(110)
+surfaces. Changing the crystallographic orientation of the surface has a
+moderate effect on the spin magnetic moment and on the number of holes in the d
+band, a larger effect on the orbital magnetic moment but sometimes a dramatic
+effect on the magnetocrystalline anisotropy energy (MAE) and on the magnetic
+dipole term T_alpha. The dependence of T_alpha on the magnetization direction
+alpha can lead to a strong apparent anisotropy of the spin magnetic moment as
+deduced from the X-ray magnetic circular dichroism (XMCD) sum rules. For
+systems in which the spin-orbit coupling is not very strong, the T_alpha term
+can be understood as arising from the differences between components of the
+spin magnetic moment associated with different magnetic quantum numbers m.",1303.5262v1
+2013-04-11,Probing the Rashba effect via the induced magnetization around a Kondo impurity,"When a single magnetic adatom is deposited on a surface of a metal, it
+affects the charge and spin texture of the electron gas surrounding it. The
+screening of the local moment by conduction electrons gives rise to the Kondo
+effect. Here we investigate the effect of the Rashba spin orbit coupling on the
+local magnetization density of states (LMDOS) around a Cobalt impurity on a
+Au(111) surface in a magnetic field. We show that the in-plane component of the
+LMDOS is exclusively associated with the Rashba spin orbit interaction. This
+observation can be experimentally exploited to confirm the presence of the
+Rashba effect on surfaces, such as Au(111), by performing spin-polarized STM
+measurements around the Kondo impurity.",1304.3293v1
+2013-07-30,Theory of quasiparticle scattering interference on the surface of topological superconductors,"Topological superconductors, such as noncentrosymmetric superconductors with
+strong spin-orbit coupling, exhibit protected zero-energy surface states, which
+possess an intricate helical spin structure. We show that this nontrival spin
+character of the surface states can be tested experimentally from the absence
+of certain backscattering processes in Fourier-transform scanning tunneling
+measurements. A detailed theoretical analysis is given of the quasiparticle
+scattering interference on the surface of both nodal and fully gapped
+topological superconductors with different crystal point-group symmetries. We
+determine the universal features in the interference patterns resulting from
+magnetic and nonmagnetic scattering processes of the surface quasiparticles. It
+is shown that Fourier-transform scanning tunneling spectroscopy allows us to
+uniquely distinguish among different types of topological surface states, such
+as zero-energy flat bands, arc surface states, and helical Majorana modes,
+which in turn provides valuable information on the spin and orbital pairing
+symmetry of the bulk superconducting state.",1307.7873v2
+2013-10-04,Influence of Dielectric Environment on Role of Spin-Orbit Interaction for Image Potentials,"We present a formalism for calculating the image potential for a
+two-dimensional electron gas (2DEG) with Rashba spin-orbit interaction (SOI) as
+well as for a 2D topological insulator (TI). The formalism is further
+generalized for including the Coulomb coupled multiple layers. Roles of broken
+inversion symmetry near the surface and the dielectric environment are
+investigated by using a surface-response function. The insignificant role of
+SOI in 2DEG is dramatically enhanced in TI by selecting a small relative
+permittivity $\epsilon_b$ for the dielectric environment. Manipulating
+$\epsilon_b$ is proven to provide an efficient way to drive electrons with
+opposite spins into two different integral quantum Hall states. The prediction
+made in this paper is expected to be experimentally observable for a 2DTI
+system, such as Bi$_2$Se$_3$, with a helical spin behavior and a dominant
+linear Rashba SOI-like term in the energy dispersion.",1310.1332v1
+2014-02-18,Two-dimensional time-reversal-invariant topological superconductivity in a doped quantum spin Hall insulator,"Time-reversal-invariant topological superconductors have a full paring gap in
+the bulk and gapless Majorana states at the edge or on the surface. Here, we
+theoretically propose topological superconductivity in a doped quantum spin
+Hall insulator. We study the pairing symmetry of doped Sn$X$ film within a
+two-orbital model, and show that it realizes a topological superconductor when
+the intraorbital attractive interaction is stronger than the interorbital
+interaction, which is generic for a doped quantum spin Hall insulator with
+strong spin-orbit coupling. Edge channels are studied in a tight-binding model
+numerically. Finally, we discuss the possible topological superconductivity in
+Sn$X$ film by comparing to $3d$ superconductivity in bulk Sn.",1402.4433v3
+2015-06-17,Orthogonal Cherenkov sound in spin-orbit coupled systems,"Conventionally the Cherenkov sound is governed by {\it orbital} degrees of
+freedom and is excited by {\it supersonic} particles. Additionally, it usually
+has a {\it forward} nature with a conic geometry known as the Cherenkov cone
+whose axis is oriented {\it along} the {\it supersonic} particle motion. Here
+we predict Cherenkov sound of a unique nature entirely resulting from the
+electronic {\it spin} degree of freedom and demonstrate a fundamentally
+distinct Cherenkov effect originating from essentially {\it subsonic} electrons
+in two-dimensional gases with both Bychkov-Rashba and Dresselhaus spin-orbit
+interactions. Specifically, we show that the axis of the conventional {\it
+forward} Cherenkov cone gets a nontrivial {\it quarter-turn} and at the same
+time the sound distribution strongly localizes around this rotated axis being
+now {\it orthogonal} to the {\it subsonic} particle motion. Apart from its
+fundamentally appealing nature, the orthogonal Cherenkov sound could have
+applications in planar semiconductor technology combining spin and acoustic
+phenomena to develop, {\it e.g.}, acoustic amplifiers or sound sources with a
+flexible spin dependent orientation of the sound propagation.",1506.05358v1
+2018-11-15,Boltzmann transport from density matrix theory: interband and intraband coherences,"To account for the anomalous/spin Hall conductivities and spin-orbit torque
+in the zeroth order of electron scattering time in strongly spin-orbit coupled
+systems, the Boltzmann transport theory in the case of weak disorder-potentials
+has been augmented by adding some interband coherence effects by hand. In this
+work these interband coherence terms are derived systematically from analyzing
+the equation of motion of the single-particle density matrix in the Bloch
+representation. Interband elements of the out-of-equilibrium density matrix are
+related to only one part of interband-coherence responses. Disorder-induced
+off-diagonal elements of the equilibrium density matrix are shown to be vital
+in producing the coordinate-shift anomalous driving term in the modified
+Boltzmann equation. Moreover, intraband coherence is inherent in the Boltzmann
+equation, whose contribution to anomalous/spin Hall conductivities is
+parametrically the same as the interband coherence.",1811.06204v1
+2020-07-04,Impurities in 3D quadratic band-touching Luttinger semimetals : Friedel and RKKY oscillations,"We investigate the response of 3D Luttinger semimetals to localized charge
+and spin impurities as a function of doping. The strong spin-orbit coupling of
+these materials strongly influences the Friedel oscillations and RKKY
+interactions. This can be seen at short distances with an $1/r^4$ divergence of
+the responses, and anisotropic behavior. Certain of the spin-orbital signatures
+are robust to temperature, even if the charge and spin oscillations are smeared
+out, and give an unusual diamagnetic Pauli susceptibility. We compare our
+results to the experimental literature on the bismuth-based half-Heuslers such
+as YPtBi and on the pyrochlore iridate Pr$_2$Ir$_2$O$_7$.",2007.02046v2
+2016-11-23,Symmetry enforced line nodes in unconventional superconductors,"We classify line nodes in superconductors with strong spin-orbit interactions
+and time-reversal symmetry, where the latter may include non-primitive
+translations in the magnetic Brillouin zone to account for coexistence with
+antiferromagnetic order. We find four possible combinations of irreducible
+representations of the order parameter on high symmetry planes, two of which
+allow for line nodes in pseudo-spin triplet pairs and two that exclude
+conventional fully gapped pseudo-spin singlet pairs. We show that the former
+can only be realized in the presence of band-sticking degeneracies, and verify
+their topological stability using arguments based on Clifford algebra
+extensions. Our classification exhausts all possible symmetry protected line
+nodes in the presence of spin-orbit coupling and a (generalized) time-reversal
+symmetry. Implications for existing non-symmorphic and antiferromagnetic
+superconductors are discussed.",1611.07590v3
+2011-11-09,Low-density molecular gas of tightly-bound Rashba-Dresselhaus fermions,"We study interacting Rashba-Dresselhaus fermions in two spatial dimensions.
+First, we present a new exact solution to the two-particle pairing problem of
+spin-orbit-coupled fermions for arbitrary Rashba and Dresselhaus spin-orbit
+interactions. An exact molecular wave function and the Green function are
+explicitly derived along with the binding energy and the spectrum of the
+molecular state. In the second part, we consider a thermal Boltzmann gas of
+fermionic molecules and compute the time-of-flight velocity and spin
+distributions for a single fermion in the gas. We show that the pairing
+signatures can be observed already in the first-moment expectation values, such
+as time-of-flight density and spin profiles.",1111.2340v2
+2014-06-06,Relativistic Particle and Relativistic Fluids: Magnetic Moment and Spin-Orbit Interactions,"We consider relativistic charged particle dynamics and relativistic
+magnetohydrodynamics using symplectic structures and actions given in terms of
+co-adjoint orbits of the Poincar\'e group. The particle case is meant to
+clarify some points such as how minimal coupling (as defined in text) leads to
+a gyromagnetic ratio of $2$, and to set the stage for fluid dynamics. The
+general group-theoretic framework is further explained and is then used to set
+up Abelian magnetohydrodynamics including spin effects. An interesting new
+physical effect is precession of spin density induced by gradients in pressure
+and energy density. The Euler equation (the dynamics of the velocity field) is
+also modified by gradients of the spin density.",1406.1551v1
+2018-01-23,The dominancy of damping like torque for the current induced magnetization switching in Pt/Co/W multilayers,"Two classes of spin-orbit coupling (SOC) mechanisms have been considered as
+candidate sources for the spin orbit torque (SOT): the spin Hall Effect (SHE)
+in heavy metals with strong SOC and the Rashba effect arising from broken
+inversion symmetry at material surfaces and interfaces. In this work, we have
+investigated the SOT in perpendicularly magnetized Pt/Co/W films, which is
+compared with the results in Pt/Co/AlOx films. Theoretically, in the case of
+the asymmetric structure of trilayers with opposite sign of spin Hall angle,
+both damping like torque and field like torque due to the SHE and the Rashba
+effect will be enhanced. Using the harmonic measurements, we have characterized
+the effective fields corresponding to the damping like torque and the field
+like torque, but we have found the dominancy of damping like torque in the
+Pt/Co/W films. It is much different from the results in the Pt/Co/AlOx films,
+in which both the damping like torque and the field like torque are strong.",1801.07408v1
+2018-01-30,Strain engineering of the silicon-vacancy center in diamond,"We control the electronic structure of the silicon-vacancy (SiV) color-center
+in diamond by changing its static strain environment with a
+nano-electro-mechanical system. This allows deterministic and local tuning of
+SiV optical and spin transition frequencies over a wide range, an essential
+step towards multi-qubit networks. In the process, we infer the strain
+Hamiltonian of the SiV revealing large strain susceptibilities of order 1
+PHz/strain for the electronic orbital states. We identify regimes where the
+spin-orbit interaction results in a large strain suseptibility of order 100
+THz/strain for spin transitions, and propose an experiment where the SiV spin
+is strongly coupled to a nanomechanical resonator.",1801.09833v2
+2018-09-07,Gravitational self-force corrections to gyroscope precession along circular orbits in the Kerr spacetime,"We generalize to Kerr spacetime previous gravitational self-force results on
+gyroscope precession along circular orbits in the Schwarzschild spacetime. In
+particular we present high order post- Newtonian expansions for the gauge
+invariant precession function along circular geodesics valid for arbitrary Kerr
+spin parameter and show agreement between these results and those derived from
+the full post-Newtonian conservative dynamics. Finally we present strong field
+numerical data for a range of the Kerr spin parameter, showing agreement with
+the GSF-PN results, and the expected lightring divergent behaviour. These
+results provide useful testing benchmarks for self- force calculations in Kerr
+spacetime, and provide an avenue for translating self-force data into the
+spin-spin coupling in effective-one-body models.",1809.02516v1
+2019-07-25,Circular polarization reversal of half-vortex cores in polariton condensates,"Vortices are topological objects carrying quantized orbital angular momentum
+and have been widely studied in many physical systems for their applicability
+in information storage and processing. In systems with spin degree of freedom
+the elementary excitations are so called half-vortices, carrying a quantum
+rotation only in one of the two spin components. We study the spontaneous
+formation and stability of localized such half-vortices in semiconductor
+microcavity polariton condensates, non-resonantly excited by a linearly
+polarized ring-shaped pump. The TE-TM splitting of optical modes in the
+microcavity system leads to an effective spin-orbit coupling, resulting in
+solutions with discrete rotational symmetry. The cross-interaction between
+different spin components provides an efficient method to realize all-optical
+half-vortex core switching inverting its circular polarization state. This
+switching can be directly measured in the polarization resolved intensity in
+the vortex core region and it can also be applied to higher order half-vortex
+states.",1907.10974v2
+2020-01-25,Spin and charge fluctuations in the two-band Hubbard model,"A model of CuO$_2$ planes of cuprate perovskites, containing $d_{x^2-y^2}$
+copper orbitals and symmetric combinations of oxygen $p_\sigma$ orbitals, is
+investigated using the strong coupling diagram technique. This approach allows
+one to take into account the interactions of carriers with spin and charge
+fluctuations of all ranges. Derived equations for Green's function are
+self-consistently solved for the set of parameters corresponding to hole- and
+electron-doped cuprates. It is shown that the mentioned interactions lead to
+the appearance of spin polarons -- bound states of carriers with spin
+excitations, which show themselves as sharp peaks of the density of states and
+spectral functions at the Fermi level. Hole and electron doping are strongly
+asymmetric. This, in particular, manifests itself in the antiferromagnetic
+response for the electron-doped case and in an incommensurate magnetic ordering
+for hole doping. In the latter case, the incommensurability parameter grows
+with doping. The double occupancy shows that the electron-doped system retains
+strong correlations up to the concentration 0.23, while for hole doping the
+correlations decay rapidly. These results are in agreement with experimental
+observations in cuprates.",2001.09270v1
+2020-12-14,Tunable Electronic Properties and Large Rashba Splittings Found in Few-Layer Bi$_2$Se$_3$/PtSe$_2$ Van der Waals Heterostructures,"We use first-principles calculations to show that van der Waals (vdW)
+heterostructures consisting of few-layer Bi$_2$Se$_3$ and PtSe$_2$ exhibit
+electronic and spintronics properties that can be tuned by varying the
+constituent layers. Type-II band alignment with layer-tunable band gaps and
+type-III band alignment with spin-splittings have been found. Most noticeably,
+we reveal the coexistence of Rashba-type spin-splittings (with large
+$\alpha_{\rm R}$ parameters) in both the conduction and valence band stemming
+from few-layer Bi$_2$Se$_3$ and PtSe$_2$, respectively, which has been
+confirmed by spin-texture plots. We discuss the role of inversion symmetry
+breaking, changes in orbital hybridization and spin-orbit coupling in altering
+electronic dispersion near the Fermi level. Since low-temperature growth
+mechanisms are available for both materials, we believe that few-layer
+Bi$_2$Se$_3$/PtSe$_2$ vdW heterostructures are feasible to realize
+experimentally, offering great potential for electronic and spintronics
+applications.",2012.07445v1
+2012-05-20,Dimensionality Driven Spin-Flop Transition in Layered Iridates,"Using resonant x-ray diffraction, we observe an easy c-axis collinear
+antiferromagnetic structure for the bilayer Sr$_3$Ir$_2$O$_7$, a significant
+contrast to the single layer Sr$_2$IrO$_4$ with in-plane canted moments. Based
+on a microscopic model Hamiltonian, we show that the observed spin-flop
+transition as a function of number of IrO$_2$ layers is due to strong
+competition among intra- and inter-layer bond-directional pseudo-dipolar
+interactions of the spin-orbit entangled $J_{eff}$=1/2 moments. With this we
+unravel the origin of anisotropic exchange interactions in a Mott insulator in
+the strong spin-orbit coupling regime, which holds the key to the various types
+of unconventional magnetism proposed in 5$d$ transition metal oxides.",1205.4381v1
+2018-06-26,Spin and valley manipulation in single and double electrostatic silicene quantum dots,"We study single and double quantum dots defined electrostatically within
+silicene. The spin-valley structure of the confined single- and two-electron
+system is determined and the effects of the intervalley scattering induced by
+the crystal edge and the Coulomb interaction are quantified. The states in a
+double quantum system are discussed in the context of the spatial symmetry of
+the single- and two-electron extended orbitals. We determine the charge, spin
+and valley transitions times induced by alternate electric fields of the
+microwave frequency. The valley transition times can be controlled by several
+orders of magnitude by the confinement potential. Also, the spin transition
+rates can be enhanced by orders of magnitude by the coupling of the bonding and
+antibonding orbitals mediated by the Rashba interaction.",1806.10012v1
+2018-08-29,"Spin-orbit-stable type-II nodal line band crossing in n-doped monolayer MoX2 (X=S,Se,Te)","1H-phase monolayer transition-metal dichalcogenides have spin-split
+electronic band structures near the K(K') point due to strong spin-orbit
+coupling and intrinsic inversion symmetry breaking. In case of the monolayer
+MoX2 (X=S, Se, Te), the spin-split conduction bands cross near the K(K') point.
+We show that the band crossing occurs not only along the high symmetry
+directions, but also along arbitrary directions due to a mirror reflection
+symmetry of the monolayer. As a result, n-doped monolayer MoX2 is a
+two-dimensional type-II nodal-line material.",1808.09585v2
+2019-01-30,Excited states of molecules in strong uniform and non-uniform magnetic fields,"This paper reports an implementation of Hartree-Fock linear response with
+complex orbitals for computing electronic spectra of molecules in a strong
+external magnetic fields. The implementation is completely general, allowing
+for spin-restricted, spin-unrestricted, and general two-component reference
+states. The method is applied to small molecules placed in strong uniform and
+non-uniform magnetic fields of astrochemical importance at the Random Phase
+Approximation level of theory. For uniform fields, where comparison is
+possible, the spectra are found to be qualitatively similar to those recently
+obtained with equation of motion coupled cluster theory. We also study the
+behaviour of spin-forbidden excitations with progressive loss of spin symmetry
+induced by non-uniform magnetic fields. Finally, the equivalence of length and
+velocity gauges for oscillator strengths when using complex orbitals is
+investigated and found to hold numerically.",1901.11086v1
+2019-02-14,Breakdown of the Hebel-Slichter effect in superconducting graphene due to the emergence of Yu-Shiba-Rusinov states at magnetic resonant scatterers,"Employing analytical methods and quantum transport simulations we investigate
+the relaxation of quasiparticle spins in graphene proximitized by an $s$-wave
+superconductor in the presence of resonant magnetic and spin-orbit active
+impurities. Off resonance, the relaxation increases with decreasing temperature
+when electrons scatter off magnetic impurities---the Hebel-Slichter
+effect---and decreases when impurities have spin-orbit coupling. This distinct
+temperature~dependence (not present in the normal state) uniquely discriminates
+between the two scattering mechanisms. However, we show that the Hebel-Slichter
+picture breaks down at resonances. The emergence of Yu-Shiba-Rusinov bound
+states within the superconducting gap redistributes the spectral weight away
+from magnetic resonances. The result is opposite to the Hebel-Slichter
+expectation: the spin relaxation decreases with decreasing temperature. Our
+findings hold for generic $s$-wave superconductors with resonant magnetic
+impurities, but also, as we show, for resonant magnetic Josephson junctions.",1902.05474v2
+2019-12-27,Nuclear spin relaxation rate near the disorder-driven quantum critical point in Weyl fermion systems,"Disorder such as impurities and dislocations in Weyl semimetals (SMs) drives
+a quantum critical point (QCP) where the density of states at the Weyl point
+gains a non-zero value. Near the QCP, the asymptotic low energy singularities
+of physical quantities are controlled by the critical exponents $\nu$ and $z$.
+The nuclear spin-lattice relaxation rate, which originates from the hyperfine
+coupling between a nuclear spin and long-range orbital currents in Weyl fermion
+systems, shows intriguing critical behavior. Based on the self-consistent Born
+approximation for impurities, we study the nuclear spin-lattice relaxation rate
+$1/T_1$ due to the orbital currents in disordered Weyl SMs. We find that
+$(T_1T)^{-1}\sim E^{2/z}$ at the QCP where $E$ is the maximum of temperature
+$T$ and chemical potential $\mu(T)$ relative to the Weyl point. This scaling
+behavior of $(T_1T)^{-1}$ is also confirmed by the self-consistent $T$-matrix
+approximation, where a remarkable temperature dependence of $\mu(T)$ could play
+an important role. We hope these results of $(T_1T)^{-1}$ will serve as an
+impetus for exploration of the disorder-driven quantum criticality in Weyl
+materials.",1912.11996v1
+2020-10-10,Paramagnetic effects of j-electron superconductivity and application to UTe2,"The putative spin-triplet superconductor UTe2 has an Ising-like magnetic
+anisotropy, indicating the Cooper pair spins parallel to the easy-axis.
+However, the upper critical field for the hard-axis direction is much larger
+than that for the easy-axis, implying the strong suppression of the Pauli
+depairing effect even for the hard-axis direction. This observation is
+consistent with the recent NMR measurements which show the tiny decrease of the
+Knight shift below the transition temperature Tc for hard-axis magnetic fields.
+We clarify that these behaviors are naturally understood as a result of
+multi-orbital f -electron bands with total angular momentum j=5/2. Taking into
+account spin-orbit couplings for an orthorhombic structure, we demonstrate that
+for hard-axis magnetic fields, the decrease of the spin susceptibility below Tc
+and the Pauli depairing effect are strongly suppressed.",2010.05112v3
+2016-12-20,Spintronics in half-passivated graphene,"In this thesis, I propose a practical way to stabilize half passivated
+graphene (graphone). I show that the dipole moments induced by a
+hexagonal-boron nitride (h-BN) substrate on graphene stabilize the hydrogen
+atoms on one sublattice of the graphene layer and suppress the migration of the
+adsorbed hydrogen atoms. I also present the substrate effect of h-BN that
+reduces distortion induced by fluorination of graphene and stabilizes
+half-passivated graphene in a single sublattice. Then using spin-polarized
+density functional calculations I investigate magnetic properties of graphone.
+I show the system has different magnetic order which can be described by either
+super-exchange or double exchange mechanisms depending on the type the of add
+atom. The hybridization of graphene changes from $sp^2$- to $sp^3$- type
+hybridization due to the buckling induced by passivation. The change in
+hybridization together with add-atom orbitals induces a fairly large spin orbit
+coupling (SOC). Based upon first principle spin-polarized density of states
+calculations, I show that the graphone obtained in different graphene/h-BN
+heterostructures exhibits a half metallic state. I propose to use this exotic
+material for spin valve systems and other spintronics devices.",1612.06846v1
+2017-07-18,Large Magnetic Anisotropy of an Iron-Porphyrin Complex on Metal Substrate,"Single magnetic atoms or molecules with large single-ion magnetic anisotropy
+are highly desired for future applications in high-density data storage and
+quantum computation. Here we have synthesized an Fe-porphyrin complex on
+Au(111) substrate in a controlled way, and revealed large magnetic anisotropy
+energy of more than 15 meV by low-temperature scanning tunneling microscopy and
+spectroscopy. Two magnetic states with opposite spin directions are
+discriminated by inelastic electron tunneling spectroscopy in varied magnetic
+field, and are found to have long spin lifetimes. First-principle calculations
+reveal that the weak ligand filed in this complex keeps the Fe atom in a
+high-spin state and preserves its large orbital angular momentum, which gives
+rise to an easy-axis perpendicular to the molecular plane and large magnetic
+anisotropy energy by spin-orbit coupling.",1707.05434v1
+2019-04-30,Ferromagnetism and Spin-Valley liquid states in Moiré Correlated Insulators,"Motivated by the recent observation of evidences of ferromagnetism in
+correlated insulating states in systems with Moir\'{e} superlattices, we study
+a two-orbital quantum antiferromagnetic model on the triangular lattice, where
+the two orbitals physically correspond to the two valleys of the original
+graphene sheet. For simplicity this model has a SU(2)$^s$$\otimes$SU(2)$^v$
+symmetry, where the two SU(2) symmetries correspond to the rotation within the
+spin and valley space respectively. Through analytical argument, Schwinger
+boson analysis and also DMRG simulation, we find that even though all the
+couplings in the Hamiltonian are antiferromagnetic, there is still a region in
+the phase diagram with fully polarized ferromagnetic order. We argue that a
+Zeeman field can drive a metal-insulator transition in our picture, as was
+observed experimentally. We also construct spin liquids and topological ordered
+phases at various limits of this model. Then after doping this model with extra
+charge carriers, the system most likely becomes spin-triplet/valley-singlet
+$d+id$ topological superconductor as was predicted previously.",1905.00033v2
+2019-05-29,Antiferromagnetic Kitaev Interactions in Polar Spin-Orbit Mott Insulators,"A bond-directional anisotropic exchange interaction, called the Kitaev
+interaction, is a promising route to realize quantum spin liquids. The Kitaev
+interactions were found in Mott insulators with the strong spin-orbit coupling,
+in the presence of quantum interference between indirect electron transfers.
+Here we theoretically propose a different scenario by introducing a polar
+structural asymmetry that unbalances the quantum interference. We show that the
+imbalance activates additional exchange processes and gives rise to a dominant
+antiferromagnetic Kitaev interaction, in stark contrast to the conventional
+ferromagnetic ones. We demonstrate by ab initio calculations that polar Ru
+trihalides with multiple anions, $\alpha$-RuH$_{3/2}X_{3/2}$ ($X$=Cl and Br),
+exhibit the antiferromagnetic Kitaev interaction whose magnitude is several
+times larger compared to existing candidates. Our proposal opens the way for
+materializing the Kitaev spin liquids in unexplored parameter regions.",1905.12139v1
+2021-02-18,Inhomogeneous Knight shift in vortex cores of superconducting FeSe,"We report $^{77}$Se NMR data in the normal and superconducting states of a
+single crystal of FeSe for several different field orientations. The Knight
+shift is suppressed in the superconducting state for in-plane fields, but does
+not vanish at zero temperature. For fields oriented out of the plane, little or
+no reduction is observed below $T_c$. These results reflect spin-singlet
+pairing emerging from a nematic state with large orbital susceptibility and
+spin-orbit coupling. The spectra and spin-relaxation rate data reveal
+electronic inhomogeneity that is enhanced in the superconducting state,
+possibly arising from enhanced density of states in the vortex cores. Despite
+the spin polarization of these states, there is no evidence for
+antiferromagnetic fluctuations.",2102.09090v1
+2021-06-30,Design and realization of topological Dirac fermions on a triangular lattice,"Large-gap quantum spin Hall insulators are promising materials for
+room-temperature applications based on Dirac fermions. Key to engineer the
+topologically non-trivial band ordering and sizable band gaps is strong
+spin-orbit interaction. Following Kane and Mele's original suggestion, one
+approach is to synthesize monolayers of heavy atoms with honeycomb coordination
+accommodated on templates with hexagonal symmetry. Yet, in the majority of
+cases, this recipe leads to triangular lattices, typically hosting metals or
+trivial insulators. Here, we conceive and realize ""indenene"", a triangular
+monolayer of indium on SiC exhibiting non-trivial valley physics driven by
+local spin-orbit coupling, which prevails over inversion-symmetry breaking
+terms. By means of tunneling microscopy of the 2D bulk we identify the quantum
+spin Hall phase of this triangular lattice and unveil how a hidden honeycomb
+connectivity emerges from interference patterns in Bloch $p_x \pm ip_y$-derived
+wave functions.",2106.16025v1
+2021-07-14,Magnetic order and its interplay with structure phase transition in van der Waals ferromagnet VI$_3$,"Van der Waals magnet VI$_3$ demonstrates intriguing magnetic properties that
+render it great for use in various applications. However, its microscopic
+magnetic structure has not been determined yet. Here, we report neutron
+diffraction and susceptibility measurements in VI$_3$ that revealed a
+ferromagnetic order with the moment direction tilted from the $c$-axis by
+~36{\deg} at 4 K. A spin reorientation accompanied by a structure distortion
+within the honeycomb plane is observed at a temperature of ~27 K, before the
+magnetic order completely disappears at $T_C$ = 50 K. The refined magnetic
+moment of ~1.3 $\mu_B$ at 4 K is considerably lower than the fully ordered spin
+moment of 2 $\mu_B$/ V$^{3+}$, suggesting the presence of a considerable
+orbital moment antiparallel to the spin moment and strong spin-orbit coupling
+in VI$_3$. This results in strong magnetoelastic interactions that make the
+magnetic properties of VI$_3$ easily tunable via strain and pressure.",2107.06443v1
+2021-09-12,Spin-polarized zero-bias peak from a single magnetic impurity at an s-wave superconductor: first-principles study,"Magnetic impurities at surfaces of superconductors can induce bound states
+referred to as Yu-Shiba-Rusinov (YSR) states within superconducting gaps.
+Understanding of YSR states with spin-orbit coupling (SOC) plays a pivotal role
+in studies of Majorana zero modes. Spin polarization of a zero-bias peak (ZBP)
+is used to determine its topological nature. Here we investigate the YSR states
+of single magnetic impurities at the surface of Pb using the fully relativistic
+first-principles simulations including band structure of Pb and five 3$d$
+orbitals of the impurity in the superconducting state. We show that for single
+Fe and Co impurities, strong SOC can induce a ZBP with rotation of the impurity
+magnetic moment and that the ZBP has large spin polarization in contrast to
+effective model studies. Conditions for a ZBP from a single magnetic impurity
+are discussed. Our results are relevant to longer atomic chains considering
+their canting and noncollinear magnetism.",2109.05511v1
+2021-11-11,Edge states in proximitized graphene ribbons and flakes in a perpendicular magnetic field: emergence of lone pseudohelical pairs and pure spin-current states,"We investigate the formation of edge states in graphene ribbons and flakes
+with proximity induced valley-Zeeman and Rashba spin-orbit couplings in the
+presence of a perpendicular magnetic field $B$. Two types of edges states
+appear in the spin-orbit gap at the Fermi level at zero field: strongly
+localized pseudohelical (intervalley) states and weakly localized intravalley
+states. We show that if the magnetic field is stronger than a crossover field
+$B_c$, which is a few mT for realistic systems such as graphene/WSe$_2$, only
+the pseudohelical edge states remain in zigzag graphene ribbons; the
+intravalley states disappear. The crossover is directly related to the closing
+and reopening of the bulk gap formed between nonzero Landau levels. Remarkably,
+in finite flakes the pseudohelical states undergo perfect reflection at the
+armchair edges if $B > B_c$, forming standing waves at the zigzag edges. These
+standing waves comprise two counterpropagating pseudohelical states, so while
+they carry no charge current, they do carry (pure) spin current.",2111.06369v1
+2022-03-23,Nonlinear optical Hall effect of few-layered NbSe2,"NbSe$_2$ is one of metallic two-dimensional (2D) transition-metal
+dichalcogenide (TMDC) materials. Because of broken crystal inversion symmetry,
+large spin splitting is induced by Ising-type spin-orbit coupling in
+odd-number-layered NbSe$_2$, but absent for even-number-layered NbSe$_2$ with
+the inversion symmetry. In this paper, we numerically calculate nonlinear
+optical charge and spin Hall conductivities of few-layered NbSe$_2$ based on an
+effective tight-binding model which includes $d_{z^2}$, $d_{x^2-y^2}$ and
+$d_{xy}$ orbitals of Nb atom. We show that the nonlinear optical Hall
+conductivity for second harmonic generation (SHG) process has nonvanishing
+value in odd-number-layered NbSe$_2$. Also, we provide nonlinear optical
+selection rule in few-layered NbSe$_2$ and their polarization dependences. In
+further, for even-number-layered case, the nonlinear optical Hall currents can
+be generated by applying electric fields which break inversion symmetry. We
+also discuss that the nonlinear optical Hall effect is expected to occur in
+TMDC materials in general. Thus, our results will serve to design potential
+opt-spintronics devices based on 2D materials to generate the spin Hall current
+by SHG.",2203.12767v1
+2022-05-22,Rashba spin-orbit interaction induced modulation of magnetic anisotropy,"In past few decades, Rashba spin-orbit coupling (SOC) has been successfully
+employed for the emergence of exotic phenomena at the quantum oxide interfaces.
+In these systems, the combined effect of charge transfer, broken symmetries and
+SOC yields intriguing interfacial magnetism and transport properties. Here, we
+provide an insight to control and tune interfacial phenomena in CaMnO3/CaIrO3
+based 3d-5d oxide heterostructures by the charge transfer driven Rashba SOC.
+Anomalous Hall effect in these canted antiferromagnetic heterostructures
+originates from the intrinsic contribution associated with the topology of the
+electronic band structure and it is mostly confined to the interface. Rashba
+SOC reconstructs the Berry curvature and enhances the anomalous Hall
+conductivity by two orders of magnitude. From the anisotropy magnetoresistance
+measurements we demonstrate that Rashba SOC is instrumental in tailoring
+magnetic anisotropy where magnetization easy-axis rotates from the out-of-plane
+direction to the in-plane direction. The ability to tune Rashba SOC and
+resulting competing magnetic anisotropy provides a route to manipulate
+electronic band structure for the origin of non-trivial spin texture useful for
+spin-orbitronics applications.",2205.10859v1
+2022-06-21,Field-induced Kitaev multipolar liquid in spin-orbit coupled $d^{2}$ honeycomb Mott insulators,"The Kitaev model, characterized by bond-dependent Ising spin interactions
+among spin-orbit entangled dipole moments in Mott insulators, offered a new
+approach to quantum spin liquids. Motivated by another type of bond-dependent
+interaction among quadrupole moments in $5d^2$ Mott insulators, we provide a
+microscopic route to uncover the Kitaev multipolar liquid, featuring
+fractionalized excitations out of non-Kramers doublets carrying multipole
+moments. The key ingredient is the magnetic field that allows for
+bond-anisotropic quadrupole-octupole interactions via mixing with the excited
+triplet states. The conditions to realize signatures of this phase in real
+materials are also discussed.",2206.10647v2
+2022-08-03,Chiral Stoner magnetism in Dirac bands,"We argue that Stoner magnetism in bands endowed with Berry curvature is
+profoundly influenced by the chiral interaction between Berry's orbital
+magnetization and spin chirality density. The key effect is that carriers
+moving in the presence of a spin texture see it as a source of a
+pseudo-magnetic field coupled to their orbital motion through a chiral
+Aharonov-Bohm effect. This interaction favors chiral spin textures such as
+skyrmions -- the topologically protected objects with particle-like properties,
+stabilized in the ground state. The chiral interaction softens the threshold
+for Stoner instability, rendering chiral spin-ordered phases readily accessible
+under realistic conditions. We illustrate this effect for a graphene multilayer
+model, with magnetization and pseudo-magnetic fields taking different values in
+different valleys, yet the results are applicable to generic Stoner magnets.",2208.02051v2
+2022-10-06,Superconductivity from electronic interactions and spin-orbit enhancement in bilayer and trilayer graphene,"We discuss a Kohn-Luttinger-like mechanism for superconductivity in Bernal
+bilayer graphene and rhombohedral trilayer graphene. Working within the
+continuum model description, we find that the screened long-range Coulomb
+interaction alone gives rise to superconductivity with critical temperatures
+that agree with experiments. We observe that the order parameter changes sign
+between valleys, which implies that both materials are valley-singlet,
+spin-triplet superconductors. Adding Ising spin-orbit coupling leads to a
+significant enhancement in the critical temperature, also in line with
+experiment, and the superconducting order parameter shows locking between the
+spin and valley degrees of freedom.",2210.02915v3
+2023-02-23,Ultrafast laser-induced spin-lattice dynamics in the van der Waals antiferromagnet CoPS3,"CoPS3 stands out in the family of the van der Waals antiferromagnets XPS3
+(X=Mn, Ni, Fe, Co) due to the unquenched orbital momentum of the magnetic Co2+
+ions which is known to facilitate the coupling of spins to both electromagnetic
+waves and lattice vibrations. Here, using a time-resolved magneto-optical
+pump-probe technique we experimentally study the ultrafast laser-induced
+dynamics of mutually correlated spins and lattice. It is shown that a
+femtosecond laser pulse acts as an ultrafast heater and thus results in the
+melting of the antiferromagnetic order. At the same time, the resonant pumping
+of the 4T1g - 4T2g electronic transition in Co2+ ions effectively changes their
+orbital momentum, giving rise to a mechanical force that moves the ions in the
+direction parallel to the orientation of their spins, thus generating a
+coherent Bg phonon mode at the frequency of about 4.7 THz.",2302.12104v1
+2023-03-06,Spin excitation of Co atoms at monatomic Cu chains,"The zero-bias anomaly in conductance spectra of single Co atoms on Cu(111)
+observed at $\approx$ 4 K, which has been interpreted as being due to a Kondo
+resonance, is strongly modified when the Co atoms are attached to monatomic Cu
+chains. Scanning tunneling spectra measured at 340 mK in magnetic fields
+exhibit all characteristics of spin-flip excitations. Their dependence on the
+magnetic field reveals a magnetic anisotropy and suggests a non-collinear spin
+state. This indicates that spin-orbit coupling (SOC), which has so far been
+neglected in theoretical studies of Co/Cu(111), has to be taken into account.
+According to our density functional theory and multi-orbital quantum Monte
+Carlo calculations SOC suppresses the Kondo effect for all studied geometries.",2303.03317v1
+2023-09-27,Investigation of magnetic properties of $4f$-adatoms on graphene,"Rare-earth (RE) atoms on top of 2D materials represent an interesting
+platform with the prospect of tailoring the magnetic anisotropy for practical
+applications. Here, we investigate the ground state and magnetic properties of
+selected $4f$-atoms deposited on a graphene substrate in the framework of the
+DFT+$U$ approach. The inherent strong spin-orbit interaction in conjunction
+with crystal field effects acting on the localized $4f$-shells results in a
+substantial magnetic anisotropy energy (tens of meVs), whose angular dependence
+is dictated by the $C_{6v}$ symmetry of the graphene substrate. We obtain the
+crystal field parameters and investigate spin-flip events via quantum tunneling
+of magnetization in the view of achieving a protected quantum-spin behavior.
+Remarkably, the large spin and orbital moments of the open $4f$-shells (Dy, Ho
+and Tm) generate a strong magneto-elastic coupling which provides more
+flexibility to control the magnetic state via the application of external
+strain.",2309.15513v1
+2023-11-09,Spectroscopy and Annihilation Decay Widths of Charmonium and Bottomonium Excitations,"We study the charmonium ($c\bar{c}$) and bottomonium ($b\bar{b}$) spectra,
+using Cornell potential with additional constant potential term in a
+non-relativistic framework, with spin-dependent corrections corresponding to
+the spin-spin, spin-orbit, and tensor interactions added perturbatively. We
+predict the masses of low-lying and excited states of charmonium and
+bottomonium up to $n=6$ and $L=2$. We analyze the radial and orbital Regge
+trajectories of both the systems and investigate their departure from
+linearity. Further, we estimate the wave function at the origin and,
+consequently, predict the decay widths of charmonium and bottomonium states
+annihilating to leptons and photons. Also, we investigate the effect of scale
+dependence of the wave function at the origin and the strong coupling constant
+on the predictions of annihilation decay widths. We compare our predictions of
+heavy quarkonium spectra and decay widths with experimental results and other
+theoretical models.",2311.05274v2
+1998-10-21,Ferromagnetic ground state of an orbital degenerate electronic model for transition-metal oxides: exact solution and physical mechanism,"We present an exact ground state solution of a one-dimensional electronic
+model for transition-metal oxides in the strong coupling limit. The model
+contains doubly degenerated orbit for itinerant electrons and the Hund coupling
+between the itinerant electrons and localized spins. The ground state is proven
+to be a full ferromagnet for any density of electrons. Our model provides a
+rigorous example for metallic ferromagnetism in narrow band systems. The
+physical mechanism for ferromagnetism and its relevance to high-dimensional
+systems, like R$_{1-x}$X$_x$MnO$_3$, are discussed. Due to the orbital
+degeneracy of itinerant electrons, the superexchange coupling can be
+ferromagnetic rather than antiferromagnetic in the one-band case.",9810268v1
+2010-07-19,An analytical approach for calculating transfer integrals in superexchange coupled dimers,"An analytical expression for the transfer integral HAB between the localized
+magnetic orbitals in superexchange-coupled dimers as a function of the type of
+atoms and geometry of the molecule has been derived by explicitly including
+orbital interactions. It is shown that HAB plays the key role for the magnetic
+coupling constant J in understanding magneto-structural correlations. The
+reliability and capability of this approach is confirmed by comparison with
+numerical electronic structure calculations in the local spin-density
+approximation on singly and doubly bridged Cu(II)-dimers with fluorine ligands.
+All results can be calculated and understood within the analytical formalism
+representing, therefore, a powerful tool for understanding the
+magneto-structural correlations and also for constructing magnetic orbitals
+analytically.",1007.3107v3
+2019-09-13,Anomalous ferromagnetism and magneto-optical Kerr effect in semiconducting double perovskite Ba2NiOsO6 and its (111) (Ba2NiOsO6)/(BaTiO3)10 superlattice,"We carry out a first-principles investigation on magnetism, electronic
+structure, magneto-optical effects and topological property of newly grown
+cubic double perovskite Ba2NiOsO6 and its (111) (Ba2NiOsO6)/(BaTiO3)10
+superlattice, based on the density functional theory with the generalized
+gradient approximation (GGA) plus onsite Couloumb interactions. Interestingly,
+we find that both structures are rare ferromagnetic (FM) semiconductors with
+estimated Curie temperatures of ~150 and 70 K, respectively. The calculated
+near-neighbor exchange coupling parameters reveal that the ferromagnetism is
+driven by exotic FM coupling between Ni and Os atoms, which is due to the FM
+superexchange interaction caused by the abnormally strong hybridization between
+the half-filled Nieg and unoccupied Os eg orbitals. The strong spin-orbit
+coupling (SOC) on the Os atom is found to not only open the semiconducting gap
+but also produce a large antiparallel orbital magnetic moment on the Os atom,
+thus reducing the total magnetization from 4.0 uB/f.u.,",1909.05996v1
+2018-12-04,Quantum interference in transport through almost symmetric double quantum dots,"We theoretically investigate transport signatures of quantum interference in
+highly symmetric double quantum dots in a parallel geometry and demonstrate
+that extremely weak symmetry-breaking effects can have a dramatic influence on
+the current. Our calculations are based on a master equation where quantum
+interference enters as non-diagonal elements of the density matrix of the
+double quantum dots. We also show that many results have a physically intuitive
+meaning when recasting our equations as Bloch-like equations for a pseudo spin
+associated with the dot occupation. In the perfectly symmetric configuration
+with equal tunnel couplings and orbital energies of both dots, there is no
+unique stationary state density matrix. Interestingly, however, adding
+arbitrarily small symmetry-breaking terms to the tunnel couplings or orbital
+energies stabilizes a stationary state either with or without quantum
+interference, depending on the competition between these two perturbations. The
+different solutions can correspond to very different current levels. Therefore,
+if the orbital energies and/or tunnel couplings are controlled by, e.g.,
+electrostatic gating, the double quantum dot can act as an exceptionally
+sensitive electric switch.",1812.01138v2
+2020-10-16,Hyperfine Couplings as a Probe of Orbital Anisotropy in Heavy Fermion Materials,"The transferred hyperfine interaction between nuclear and electron spins in
+an heavy fermion material depends on the hybridization between the $f$-electron
+orbitals and those surrounding a distant nucleus. In CeMIn$_5$ (M=Rh, Ir, Co),
+both the hyperfine coupling to the two indium sites as well as the crystalline
+electric field at the Ce are strongly dependent on the transition metal. We
+measure a series of CeRh$_{1-x}$Ir$_x$In$_5$ crystals and find that the
+hyperfine coupling reflects the orbital anisotropy of the ground state Ce 4$f$
+wavefunction. These findings provide direct proof that the localized to
+itinerant transition is dominated by hybridization out of the Ce-In plane in
+this system.",2010.08636v1
+1995-08-21,A Microscopic Model of Non-Reciprocal Optical Effects in Cr_2 O_3,"This manuscript deals with the question ""How does light couple to an
+antiferromagnetic order parameter""? For that we develop a microscopic model
+that explains the non-reciprocal optical effects in centrosymmetric Cr_2 O_3.
+It is shown that light can couple {\em directly} to the antiferromagnetic order
+parameter. This coupling is mediated by the spin-orbit interaction and involves
+an interplay between the breaking of inversion symmetry due to the
+antiferromagnetic order parameter and the trigonal field contribution to the
+ligand field at the Cr^{3+} ion.",9508082v1
+2003-04-11,Coupled plasmon-phonon modes in a two-dimensional electron gas in the presence of Rashba effect,"Elementary electronic excitation is studied theoretically for a 2DEG in the
+presence of spin orbit (SO) interaction induced by Rashba effect. In such a
+system, coupled plasmon-phonon excitation can be achieved via intra- and
+inter-SO electronic transitions. As a result, six branches of the coupled
+plasmon-phonon oscillations can be observed. The interesting features of these
+excitation modes are analyzed.",0304257v1
+2002-11-12,Effect of tensor couplings in a relativistic Hartree approach for finite nuclei,"The relativistic Hartree approach describing the bound states of both
+nucleons and anti-nucleons in finite nuclei has been extended to include tensor
+couplings for the $\omega$- and $\rho$-meson. After readjusting the parameters
+of the model to the properties of spherical nuclei, the effect of
+tensor-coupling terms rises the spin-orbit force by a factor of 2, while a
+large effective nucleon mass $m^{*}/M_{N} \approx 0.8$ sustains. The overall
+nucleon spectra of shell-model states are improved evidently. The predicted
+anti-nucleon spectra in the vacuum are deepened about 20 -- 30 MeV.",0211034v1
+2013-03-19,Tunnel conductance spectroscopy via harmonic generation in a hybrid capacitor device,"We address the measurement of density of states within and beyond the
+superconducting gap in tunnel-coupled finite-size nanostructures using a
+capacitive method. Third-harmonic generation is used to yield the full
+differential conductance spectrum without destruction of the low dimensionality
+otherwise induced by intimate ohmic coupling to an electrode. The method is
+particularly relevant to attempts to discern the presence of the fragile
+Majorana quasiparticle at the end of spin-orbit-coupled nanowires in
+appropriate magnetic field conditions by their signature mid-gap density of
+states.",1303.4719v4
+2014-08-17,Detecting a quantum critical point in topological SN junctions,"A spin-orbit coupled quantum wire, with one end proximate to an s-wave
+superconductor, can become a topological superconductor, with a Majorana mode
+localized at each end of the superconducting region. It was recently shown that
+coupling one end of such a topological superconductor to $two$ normal channels
+of interacting electrons leads to a novel type of frustration and a quantum
+critical point when both channels couple with equal strength. We propose an
+experimental method to access this critical point in a $single$ quantum wire
+and show its resilience to disorder.",1408.3804v3
+2015-06-03,Double-expansion impurity solver for multiorbital models with dynamically screened U and J,"We present a continuous-time Monte Carlo impurity solver for multiorbital
+impurity models which combines a strong-coupling hybridization expansion and a
+weak-coupling expansion in the Hund's coupling parameter J. This
+double-expansion approach allows to treat the dominant density-density
+interactions U within the efficient segment representation. We test the
+approach for a two-orbital model with static interactions, and then explain how
+the double-expansion allows to simulate models with frequency dependent
+U(\omega) and J(\omega). The method is used to investigate spin state
+transitions in a toy model for fullerides, with repulsive bare J but attractive
+screened J.",1506.01173v1
+2015-11-05,From Coupled Rashba Electron and Hole Gas Layers to 3D Topological Insulators,"We introduce a system of stacked two-dimensional electron and hole gas layers
+with Rashba spin orbit interaction and show that the tunnel coupling between
+the layers induces a strong three- dimensional (3D) topological insulator
+phase. At each of the two-dimensional bulk boundaries we find the spectrum
+consisting of a single anistropic Dirac cone, which we show by analytical and
+numerical calculations. Our setup has a unit-cell consisting of four tunnel
+coupled Rashba layers and presents a synthetic strong 3D topological insulator
+and is distinguished by its rather high experimental feasibility.",1511.01742v1
+2016-02-19,Nonlinear waves in coherently coupled Bose-Einstein condensates,"We consider a quasi-one-dimensional two-component Bose-Einstein condensate
+subject to a coherent coupling between its components, such as realized in
+spin-orbit coupled condensates. We study how nonlinearity modifies the dynamics
+of the elementary excitations. The spectrum has two branches which are affected
+in different ways. The upper branch experiences a modulational instability
+which is stabilized by a long wave-short wave resonance with the lower branch.
+The lower branch is stable. In the limit of weak nonlinearity and small
+dispersion it is described by a Korteweg-de Vries equation or by the Gardner
+equation, depending on the value of the parameters of the system.",1602.06141v1
+2011-11-07,Description of single-Lambda hypernuclei with relativistic point coupling model,"We extend the relativistic point coupling model to single-$\Lambda$
+hypernuclei. For this purpose, we add $N$-$\Lambda$ effective contact couplings
+to the model Lagrangian, and determine the parameters by fitting to the
+experimental data for $\Lambda$ binding energies. Our model well reproduces the
+data over a wide range of mass region although some of our interactions yield
+the reverse ordering of the spin-orbit partners from that of nucleons for heavy
+hypernuclei. The consistency of the interaction with the quark model
+predictions is also discussed.",1111.1488v1
+2018-01-09,Magneto-electric effect in doped magnetic ferroelectrics,"We propose a model of magneto-electric effect in doped magnetic
+ferroelectrics. This magneto-electric effect does not involve the spin-orbit
+coupling and is based purely on the Coulomb interaction. We calculate magnetic
+phase diagram of doped magnetic ferroelectrics. We show that magneto-electric
+coupling is pronounced only for ferroelectrics with low dielectric constant. We
+find that magneto-electric coupling leads to modification of magnetization
+temperature dependence in the vicinity of ferroelectric phase transition. A
+peak of magnetization appears. We find that magnetization of doped magnetic
+ferroelectrics strongly depends on applied electric field.",1801.03114v1
+2021-08-10,The correlation function of a two-dimensional electron gas with anharmonic potential and Rashba coupling,"In this paper, we study a two-dimensional gas of electrons with Rashba
+spin-orbit coupling with anharmonic potential. The splitting of the Hamiltonian
+in two parts can be recovering the Jaynes-Cummings model, which describes a
+system with two states. The dynamics of the rising Pauli operator and the
+creation operators are studied. Finally, we examined the behavior of the
+correlation function of emission and absorption photons for the strong and weak
+coupling.",2108.04574v1
+2004-02-13,Probing spin and orbital Kondo effects with a mesoscopic interferometer,"We investigate theoretically the transport properties of a closed
+Aharonov-Bohm interferometer containing two quantum dots in the strong coupling
+regime. We find two distinct physical scenarios depending on the strength of
+the interdot Coulomb interaction. When the interdot Coulomb interaction is
+negligible only spin fluctuations are important and each dot develops a Kondo
+resonance at the Fermi level independently of the applied magnetic flux. The
+transport is characterized by the interference of these two independent Kondo
+resonances. On the contrary, for large interdot interaction, only one electron
+can be accommodated onto the double dot system. In this situation, not only the
+spin can fluctuate but also the orbital degree of freedom (the pseudo-spin). As
+a result, we find different ground states depending on the value of the applied
+flux. When $\phi=\pi$ (mod $2\pi$) ($\phi=2\pi\Phi/\Phi_0$, where $\Phi$ is
+applied flux, and $\Phi_0=h/e$ the flux quantum) the electronic transport can
+take place via simultaneous correlations in the spin and pseudo-spin sectors,
+leading to the highly symmetric SU(4) Kondo state. Nevertheless, we find
+situations with $\phi>0$ (mod $2\pi$) where the pseudo-spin quantum number is
+not conserved during tunneling events, giving rise to the common SU(2) Kondo
+state with an enhanced Kondo temperature. We investigate the crossover between
+both ground states and discuss possible experimental signatures of this physics
+as a function of the applied magnetic flux.",0402361v2
+2002-06-25,Initial-State Interactions and Single-Spin Asymmetries in Drell-Yan Processes,"We show that the initial-state interactions from gluon exchange between the
+incoming quark and the target spectator system lead to leading-twist
+single-spin asymmetries in the Drell-Yan process. The QCD initial-state
+interactions produce a $T-$odd spin-correlation between the target spin and the
+virtual photon production plane which is not power-law suppressed in the
+Drell-Yan scaling limit. The origin of the single-spin asymmetry in $\pi
+p^\uparrow \to \ell^+ \ell^- X$ is a phase difference between two amplitudes
+coupling the proton target with $J^z_p = \pm {1\over 2}$ to the same
+final-state, the same amplitudes which are necessary to produce a nonzero
+proton anomalous magnetic moment. The calculation requires the overlap of
+target light-front wavefunctions differing by one unit of orbital angular
+momentum projection $L_z;$ thus the SSA in the Drell-Yan reaction provides a
+direct measure of orbital angular momentum in the QCD bound state. The
+single-spin asymmetry predicted for the Drell-Yan process $\pi p^\uparrow \to
+\ell^+ \ell^- X$ is similar to the single-spin asymmetries in deep inelastic
+semi-inclusive leptoproduction $\ell p^\uparrow \to \ell' \pi X$ which arises
+from the final-state rescattering of the outgoing quark.",0206259v1
+2008-08-15,Wigner crystal physics in quantum wires,"The physics of interacting quantum wires has attracted a lot of attention
+recently. When the density of electrons in the wire is very low, the strong
+repulsion between electrons leads to the formation of a Wigner crystal. We
+review the rich spin and orbital properties of the Wigner crystal, both in the
+one-dimensional and quasi-one-dimensional regime. In the one-dimensional Wigner
+crystal the electron spins form an antiferromagnetic Heisenberg chain with
+exponentially small exchange coupling. In the presence of leads the resulting
+inhomogeneity of the electron density causes a violation of spin-charge
+separation. As a consequence the spin degrees of freedom affect the conductance
+of the wire. Upon increasing the electron density, the Wigner crystal starts
+deviating from the strictly one-dimensional geometry, forming a zigzag
+structure instead. Spin interactions in this regime are dominated by ring
+exchanges, and the phase diagram of the resulting zigzag spin chain has a
+number of unpolarized phases as well as regions of complete and partial spin
+polarization. Finally we address the orbital properties in the vicinity of the
+transition from a one-dimensional to a quasi-one-dimensional state. Due to the
+locking between chains in the zigzag Wigner crystal, only one gapless mode
+exists. Manifestations of Wigner crystal physics at weak interactions are
+explored by studying the fate of the additional gapped low-energy mode as a
+function of interaction strength.",0808.2076v2
+2011-05-04,Quantum Spin Hall Effect in Graphene Nanoribbons: Effect of Edge Geometry,"There has been tremendous recent progress in realizing topological insulator
+initiated by the proposal of Kane and Mele for the graphene system. They have
+suggested that the odd $Z_2$ index for the graphene manifests the spin filtered
+edge states for the graphene nanoribbons, which lead to the quantum spin Hall
+effect(QSHE). Here we investigate the role of the spin-orbit interaction both
+for the zigzag and armchair nanoribbons with special care in the edge geometry.
+For the pristine zigzag nanoribbons, we have shown that one of the $\sigma$
+edge bands located near E=0 lifts up the energy of the spin filtered chiral
+edge states at the zone boundary by warping the $\pi$-edge bands, and hence the
+QSHE does not occur. Upon increasing the carrier density above a certain
+critical value, the spin filtered edge states are formed leading to the QSHE.
+We suggest that the hydrogen passivation on the edge can recover the original
+feature of the QSHE. For the armchair nanoribbon, the QSHE is shown to be
+stable. We have also derived the real space effective hamiltonian, which
+demonstrates that the on-site energy and the effective spin orbit coupling
+strength are strongly enhanced near the ribbon edges. We have shown that the
+steep rise of the confinement potential thus obtained is responsible for the
+warping of the $\pi$-edge bands.",1105.0733v1
+2011-06-27,"Meissner effect, Spin Meissner effect and charge expulsion in superconductors","The Meissner effect and the Spin Meissner effect are the spontaneous
+generation of charge and spin current respectively near the surface of a metal
+making a transition to the superconducting state. The Meissner effect is well
+known but, I argue, not explained by the conventional theory, the Spin Meissner
+effect has yet to be detected. I propose that both effects take place in all
+superconductors, the first one in the presence of an applied magnetostatic
+field, the second one even in the absence of applied external fields. Both
+effects can be understood under the assumption that electrons expand their
+orbits and thereby lower their quantum kinetic energy in the transition to
+superconductivity. Associated with this process, the metal expels negative
+charge from the interior to the surface and an electric field is generated in
+the interior. The resulting charge current can be understood as arising from
+the magnetic Lorentz force on radially outgoing electrons, and the resulting
+spin current can be understood as arising from a spin Hall effect originating
+in the Rashba-like coupling of the electron magnetic moment to the internal
+electric field. The associated electrodynamics is qualitatively different from
+London electrodynamics, yet can be described by a small modification of the
+conventional London equations. The stability of the superconducting state and
+its macroscopic phase coherence hinge on the fact that the orbital angular
+momentum of the carriers of the spin current is found to be exactly $\hbar/2$,
+indicating a topological origin. The simplicity and universality of our theory
+argue for its validity, and the occurrence of superconductivity in many classes
+of materials can be understood within our theory.",1106.5311v1
+2013-05-06,Liquid-like correlations in single crystalline Y2Mo2O7: an unconventional spin glass,"The spin glass behavior of Y2Mo2O7 has puzzled physicists for nearly three
+decades. Free of bulk disorder within the resolution of powder diffraction
+methods, it is thought that this material is a rare realization of a spin glass
+resulting from weak disorder such as bond disorder or local lattice
+distortions. Here, we report on the single crystal growth of Y2Mo2O7. Using
+neutron scattering, we present unique isotropic magnetic diffuse scattering
+arising beneath the spin glass transition despite having a well-ordered
+structure at the bulk level. Despite our attempts to model the diffuse
+scattering using a computationally exhaustive search of a class of simple spin
+Hamiltonians, we were unable to replicate the experimentally observed
+energy-integrated (diffuse) neutron scattering. A T^2-temperature dependence in
+the heat capacity and density functional theory calculations hint at
+significant frozen degeneracy in both the spin and orbital degrees of freedom
+resulting from spin-orbital coupling (Kugel-Khomskii type) and random
+fluctuations in the Mo environment at the local level.",1305.1274v2
+2014-10-14,Current-induced spin polarization at the surface of metallic films: a theorem and an ab initio calculation,"The broken inversion symmetry at the surface of a metallic film (or, more
+generally, at the interface between a metallic film and a different metallic or
+insulating material) greatly amplifies the influence of the spin-orbit
+interaction on the surface properties. The best known manifestation of this
+effect is the momentum-dependent splitting of the surface state energies
+(Rashba effect). Here we show that the same interaction also generates a
+spin-polarization of the bulk states when an electric current is driven through
+the bulk of the film. For a semi-infinite jellium model, which is
+representative of metals with a closed Fermi surface, we prove as a theorem
+that, regardless of the shape of the confinement potential, the induced surface
+spin density at each surface is given by ${\bf S} =-\gamma \hbar {\bf \hat
+z}\times {\bf j}$, where ${\bf j}$ is the particle current density in the bulk,
+${\bf \hat z}$ the unit vector normal to the surface, and
+$\gamma=\frac{\hbar}{4mc^2}$ contains only fundamental constants. For a general
+metallic solid $\gamma$ becomes a material-specific parameter that controls the
+strength of the interfacial spin-orbit coupling. Our theorem, combined with an
+{\it ab initio} calculation of the spin polarization of the current-carrying
+film, enables a determination of $\gamma$, which should be useful in modeling
+the spin-dependent scattering of quasiparticles at the interface.",1410.3693v1
+2014-12-02,Spin-Orbit Proximity Effect in Graphene,"The development of a spintronics device relies on efficient generation of
+spin polarized currents and their electric field controlled manipulation. While
+observation of exceptionally long spin relaxation lengths make graphene an
+intriguing material for spintronics studies, modulation of spin currents by
+gate field is almost impossible due to negligibly small intrinsic spin orbit
+coupling (SOC) of graphene. In this work, we create an artificial interface
+between monolayer graphene and few-layers semiconducting tungsten disulfide
+(WS2). We show that in such devices graphene acquires a SOC as high as 17meV,
+three orders of magnitude higher than its intrinsic value, without modifying
+any of the structural properties of the graphene. Such proximity SOC leads to
+the spin Hall effect even at room temperature and opens the doors for spin
+FETs. We show that intrinsic defects in WS2 play an important role in this
+proximity effect and that graphene can act as a probe to detect defects in
+semiconducting surfaces.",1412.0920v1
+2016-04-11,Quantum Diagrammatic Theory of the Extrinsic Spin Hall Effect in Graphene,"We present a rigorous microscopic theory of the extrinsic spin Hall effect in
+disordered graphene based on a nonperturbative quantum diagrammatic treatment
+incorporating skew scattering and anomalous---impurity
+concentration-independent---quantum corrections on equal footing. The leading
+skew scattering contribution to the spin Hall conductivity is shown to
+quantitatively agree with Boltzmann transport theory over a wide range of
+parameters. Our self-consistent approach---where all topologically equivalent
+noncrossing diagrams are resummed---unveils that the skewness generated by
+spin--orbit-active impurities deeply influences the anomalous component of the
+spin Hall conductivity, even in the weak scattering regime. This seemingly
+counterintuitive result is explained by the rich sublattice structure of
+scattering potentials in graphene, for which traditional Gaussian disorder
+approximations fail to capture the intricate correlations between skew
+scattering and side jumps generated through diffusion. Finally, we assess the
+role of quantum interference corrections by evaluating an important subclass of
+crossing diagrams recently considered in the context of the anomalous Hall
+effect, the $X$ and $\Psi$ diagrams [Ado et al., EPL 111, 37004 (2015)]. We
+show that $\Psi$ diagrams---encoding quantum coherent skew scattering---display
+a strong Fermi energy dependence, dominating the anomalous spin Hall component
+away from the Dirac point. Our findings have direct implications for nonlocal
+transport experiments in spin--orbit-coupled graphene systems.",1604.03111v1
+2020-07-13,Molecule Oxygen Induced Ferromagnetism and Half-metallicity in α-BaNaO4: A First Principles Study,"Molecule oxygen resembles 3d and 4f metals in exhibiting long-range spin
+ordering and electron strong correlated behaviors in compounds. The
+ferromagnetic spin ordering and half-metallicity, however, are quite elusive
+and have not been well acknowl-edged. In this article, we address this issue to
+study how spins will interact each other if the oxygen dimers are arranged in a
+dif-ferent way from that in the known super- and per-oxides by first principles
+calculations. Based on the results of structure search, thermodynamic study and
+lattice dynamics, we show that tetragonal {\alpha}-BaNaO4 is a stable
+half-metal with a Curie temperature at 120 K, a first example in this class of
+compounds. Like 3d and 4f metals, the O2 dimer carries a local magnetic moment
+0.5 {\mu}B due to the unpaired electrons in its {\pi}* orbitals. This compound
+can be regarded as forming from the O2 dimer layers stacking in a head to head
+way. Different from that in AO2 (A=K, Rb, Cs), the spins are both
+ferromagnetically coupled within and between the layers. Spin polarization
+occurs in {\pi}* orbitals with spin-up electrons fully occupying the valence
+band and spin-down electrons partially the conduction band, forming the
+semiconducting and metallic channels, respectively. Our results highlight the
+im-portance of geometric arrangement of O2 dimers in inducing ferromagnetism
+and other novel properties in O2 dimer containing compounds.",2007.06433v1
+2020-02-26,Local spin polarizations in relativistic heavy ion collisions,"Based on a generalized side-jump formalism for massless chiral fermions,
+which naturally takes into account the spin-orbit coupling in the scattering of
+two chiral fermions and the chiral vortical effect in a rotating chiral fermion
+matter, we have developed a covariant and total angular momentum conserved
+chiral transport model to study both the global and local polarizations of this
+matter. For a system of massless quarks of random spin orientations and finite
+vorticity in a box, we have demonstrated that the model can exactly conserve
+the total angular momentum of the system and dynamically generate the quark
+spin polarization expected from a thermally equilibrated quark matter. Using
+this model to study the spin polarization in relativistic heavy-ion collision,
+we have found that the local quark spin polarizations depend strongly on the
+reference frame where they are evaluated as a result of the nontrivial axial
+charge distribution caused by the chiral vortical effect. We have further shown
+that because of the anomalous orbital or side-jump contribution to the quark
+spin polarization, the local quark polarizations calculated in the medium rest
+frame are qualitatively consistent with the local polarizations of Lambda
+hyperons measured in experiments.",2002.11752v1
+2018-03-02,Neutron spin resonance in the 112-type iron-based superconductor,"We use inelastic neutron scattering to study the low-energy spin excitations
+of 112-type iron pnictide Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_{2}$
+with bulk superconductivity below $T_c=22$ K. A two-dimensional spin resonance
+mode is found around $E=$ 11 meV, where the resonance energy is almost
+temperature independent and linearly scales with $T_c$ along with other
+iron-based superconductors. Polarized neutron analysis reveals the resonance is
+nearly isotropic in spin space without any $L$ modulations. Due to the unique
+monoclinic structure with additional zigzag arsenic chains, the As $4p$
+orbitals contribute to a three-dimensional hole pocket around $\Gamma$ point
+and an extra electron pocket at $X$ point. Our results suggest that the energy
+and momentum distribution of spin resonance does not directly response to the
+$k_z$ dependence of fermiology, and the spin resonance intrinsically is a
+spin-1 mode from singlet-triplet excitations of the Cooper pairs in the case of
+weak spin-orbital coupling.",1803.00779v2
+2018-08-15,Chirality and intrinsic dissipation of spin modes in two-dimensional electron liquids,"We review recent theoretical and experimental developments concerning
+collective spin excitations in two-dimensional electron liquid (2DEL) systems,
+with particular emphasis on the interplay between many-body and spin-orbit
+effects, as well as the intrinsic dissipation due to the spin-Coulomb drag.
+Historically, the experimental realization of 2DELs in silicon inversion layers
+in the 60s and 70s created unprecedented opportunities to probe subtle quantum
+effects, culminating in the discovery of the quantum Hall effect. In the
+following years, high quality 2DELs were obtained in doped quantum wells made
+in typical semiconductors like GaAs or CdTe. These systems became important
+test beds for quantum many-body effects due to Coulomb interaction, spin
+dynamics, spin-orbit coupling, effects of applied magnetic fields, as well as
+dissipation mechanisms. Here we focus on the recent results involving chiral
+effects and intrinsic dissipation of collective spin modes: these are not only
+of fundamental interest but also important towards demonstrating new concepts
+in spintronics. Moreover, new realizations of 2DELs are emerging beyond
+traditional semiconductors, for instance in multilayer graphene, oxide
+interfaces, dichalcogenide monolayers, and many more. The concepts discussed in
+this review will be relevant also for these emerging systems.",1808.05266v2
+2020-05-09,Valley and spin polarized broken symmetry states of interacting electrons in gated MoS$_2$ quantum dots,"Understanding strongly interacting electrons enables the design of materials,
+nanostructures and devices. Developing this understanding relies on the ability
+to tune and control electron-electron interactions by, e.g., confining
+electrons to atomically thin layers of 2D crystals with reduced screening. The
+interplay of strong interactions on a hexagonal lattice with two nonequivalent
+valleys, topological moments, and the Ising-like spin-orbit interaction gives
+rise to a variety of phases of matter corresponding to valley and spin
+polarized broken symmetry states. In this work we describe a highly tunable
+strongly interacting system of electrons laterally confined to monolayer
+transition metal dichalcogenide MoS$_2$ by metalic gates. We predict the
+existence of valley and spin polarized broken symmetry states tunable by the
+parabolic confining potential using exact diagonalization techniques for up to
+$N=6$ electrons. We find that the ground state is formed by one of two phases,
+either both spin and valley polarized or valley unpolarised but spin
+intervalley antiferromagnetic, which compete as a function of electronic shell
+spacing. This finding can be traced back to the combined effect of Ising-like
+spin-orbit coupling and weak intervalley exchange interaction. These results
+provide an explanation for interaction-driven symmetry-breaking effects in
+valley systems and highlight the important role of electron-electron
+interactions for designing valleytronic devices.",2005.04467v1
+2021-06-23,Electrical control of the hole spin qubit in Si and Ge nanowire quantum dots,"Strong, direct Rashba spin-orbit coupling in Si, Ge, and the Ge/Si core/shell
+nanowire quantum dot (QD) allows for all electrical manipulation of the hole
+spin qubit. Motivated by this fact, we analyze different fabrication-dependent
+properties of nanowires, such as orientation, cross section, and the presence
+of strain, with the goal being to find the material and geometry that enables
+the fastest qubit manipulation, whose speed can be identified using the Rabi
+frequency. We show that QD in nanowires with a circular cross section (cNWs)
+enables much weaker driving of the hole spin qubit than QDs embedded in square
+profile nanowires (sNWs). Assuming the orientation of the Si nanowire that
+maximizes the spin-orbit effects, our calculations predict that the Rabi
+frequencies of the hole spin qubits inside Ge and Si sNW QD have comparable
+strengths for weak electric fields. The global maximum of the Rabi frequency is
+found in Si sNW QD for strong electric fields, putting this setup ahead of
+others in creating the hole spin qubit. Finally, we demonstrate that strain in
+the Si/Ge core/shell nanowire QD decreases the Rabi frequency. In cNW QD, this
+effect is weak; in sNW QD, it is possible to optimize the impact of strain with
+the appropriate tuning of the electric field strength.",2106.12551v2
+2021-06-29,Spin Hall effect in a spin-1 chiral semimetal,"Spin-1 chiral semimetal is a new state of quantum matter hosting
+unconventional chiral fermions that extend beyond the common Dirac and Weyl
+fermions. B20-type CoSi is a prototypal material that accommodates such an
+exotic quasiparticle. To date, the spin transport properties in the spin-1
+chiral semimetals, have not been explored yet. In this work, we fabricated
+B20-CoSi thin films on sapphire c-plane substrates by magnetron sputtering and
+studied the spin Hall effect (SHE) by combining experiments and
+first-principles calculations. The SHE of CoSi using CoSi/CoFeB/MgO
+heterostructures was investigated via spin Hall magnetoresistance and harmonic
+Hall measurements. First-principles calculations yield an intrinsic spin Hall
+conductivity (SHC) at the Fermi level that is consistent with the experiments
+and reveal its unique Fermi-energy dependence. Unlike the Dirac and Weyl
+fermion-mediated Hall conductivities that exhibit a peak-like structure
+centering around the topological node, SHC of B20-CoSi is odd and crosses zero
+at the node with two antisymmetric local extrema of opposite sign situated
+below and above in energy. Hybridization between Co d-Si p orbitals and
+spin-orbit coupling are essential for the SHC, despite the small (~1%) weight
+of Si p-orbital near the Fermi level. This work expands the horizon of
+topological spintronics and highlights the importance of Fermi-level tuning in
+order to fully exploit the topology of spin-1 chiral fermions for spin current
+generation.",2106.15107v1
+2021-07-08,"Magnetism, symmetry and spin transport in van der Waals layered systems","The discovery of an ever increasing family of atomic layered magnetic
+materials, together with the already established vast catalogue of strong
+spin-orbit coupling (SOC) and topological systems, calls for some guiding
+principles to tailor and optimize novel spin transport and optical properties
+at their interfaces. Here we focus on the latest developments in both fields
+that have brought them closer together and make them ripe for future fruitful
+synergy. After outlining fundamentals on van der Waals (vdW) magnetism and SOC
+effects, we discuss how their coexistence, manipulation and competition could
+ultimately establish new ways to engineer robust spin textures and drive the
+generation and dynamics of spin current and magnetization switching in 2D
+materials-based vdW heterostructures. Grounding our analysis on existing
+experimental results and theoretical considerations, we draw a prospective
+analysis about how intertwined magnetism and spin-orbit torque (SOT) phenomena
+combine at interfaces with well-defined symmetries, and how this dictates the
+nature and figures-of-merit of SOT and angular momentum transfer. This will
+serve as a guiding role in designing future non-volatile memory devices that
+utilize the unique properties of 2D materials with the spin degree of freedom.",2107.03763v2
+2022-08-15,Nonperturbative approach to interfacial spin-orbit torques induced by Rashba effect,"Current-induced spin-orbit torque (SOT) in normal metal/ferromagnet (NM/FM)
+bilayers bears great promise for technological applications, but the
+microscopic origin of purely interfacial SOTs in ultra-thin systems is not yet
+fully understood. Here, we show that a linear response theory with a
+nonperturbative treatment of spin-dependent interactions and impurity
+scattering potential predicts damping-like SOTs that are strictly absent in
+perturbative approaches. The technique is applied to a two-dimensional
+Rashba-coupled ferromagnet (the paradigmatic model of a NM/FM interface), where
+higher-order scattering processes encoding skew scattering from nonmagnetic
+impurities allow for current-induced spin polarization with nonzero components
+along all spatial directions. This is in stark contrast to previous results of
+perturbative methods (neglecting skew scattering), which predict a coplanar
+spin-polarization locked perpendicular to the charge current as a result of
+conventional Rashba-Edelstein effect. Furthermore, the angular dependence of
+ensuing SOTs and their dependence upon the scattering potential strength is
+analysed numerically. Simple analytic expressions for the
+spin-density--charge-current response function, and related SOT efficiencies,
+are obtained in the weak scattering limit. We find that the extrinsic
+damping-like torques driven by impurity scattering reaches efficiencies of up
+to 7% of the field-like (Rashba-Edelstein) torque. Our microscopic theory shows
+that bulk phenomena, such as the spin Hall effect, are not a necessity in the
+generation of the damping-like SOTs of the type observed in experiments on
+ultra-thin systems.",2208.07296v1
+2024-03-25,Stellar Spin Down in Post-Mass Transfer Binary Systems,"Motivated by measurements of the rotation speed of accretor stars in
+post-mass-transfer (post-MT) systems, we investigate how magnetic braking
+affects the spin-down of individual stars during binary evolution with the
+\texttt{MESAbinary} module. Unlike the conventional assumption of tidal
+synchronization coupled with magnetic braking in binaries, we first calculate
+whether tides are strong enough to synchronize the orbit. Subsequently, this
+influences the spin-down of stars and the orbital separation. In this study, we
+apply four magnetic braking prescriptions to reduce the spin angular momentum
+of the two stars throughout the entire binary evolution simulation. Our
+findings reveal that despite magnetic braking causing continuous spin-down of
+the accretor, when the donor begins to transfer material onto the accretor, the
+accretor can rapidly spin up to its critical rotation rate. After MT, magnetic
+braking becomes more important in affecting the angular momentum evolution of
+the stars. Post-MT accretor stars thus serve as a valuable testbed for
+observing how the magnetic braking prescriptions operate in spinning down stars
+from their critical rotation, including the saturation regimes of the magnetic
+braking. The rotation rate of the accretor star, combined with its mass, could
+provide age information since the cessation of MT. By comparing the models
+against observation, the magnetic braking prescription by Garraffo et al.
+(2018b) is found to better align with the rotation data of post-MT accretors.",2403.17279v1
+2017-06-19,"Proximity effects in bilayer graphene on monolayer WSe$_2$: Field-effect spin-valley locking, spin-orbit valve, and spin transistor","Proximity orbital and spin-orbit effects of bilayer graphene on monolayer
+WSe$_2$ are investigated from first-principles. We find that the built-in
+electric field induces an orbital band gap of about 10 meV in bilayer graphene.
+Remarkably, the proximity spin-orbit splitting for holes is two orders of
+magnitude---the spin-orbit splitting of the valence band at K is about 2
+meV---more than for electrons. Effectively, holes experience spin-valley
+locking due to the strong proximity of the lower graphene layer to WSe$_2$.
+However, applying an external transverse electric field of some 1 V/nm,
+countering the built-in field of the heterostructure, completely reverses this
+effect and allows, instead for holes, electrons to be spin-valley locked with 2
+meV spin-orbit splitting. Such a behavior constitutes a highly efficient
+field-effect spin-orbit valve, making bilayer graphene on WSe$_2$ a potential
+platform for a field-effect spin transistor.",1706.06149v1
+2007-08-04,The Spin Density Matrix I: General Theory and Exact Master Equations,"We consider a scenario where interacting electrons confined in quantum dots
+(QDs) are either too close to be resolved, or we do not wish to apply
+measurements that resolve them. Then the physical observable is an electron
+spin only (one cannot unambiguously ascribe a spin to a QD) and the system
+state is fully described by the spin-density matrix. Accounting for the spatial
+degrees of freedom, we examine to what extent a Hamiltonian description of the
+spin-only degrees of freedom is valid. We show that as long as there is no
+coupling between singlet and triplet states this is indeed the case, but when
+there is such a coupling there are open systems effects, i.e., the dynamics is
+non-unitary even without interaction with a true bath. Our primary focus is an
+investigation of non-unitary effects, based on exact master equations we derive
+for the spin-density matrix in the Lindblad and time-convolutionless (TCL)
+forms, and the implications for quantum computation. In particular, we
+demonstrate that the Heisenberg interaction does not affect the unitary part
+(apart from a Lamb shift) but does affect the non-unitary contributions to time
+evolution of the spin-density matrix. In a sequel paper we present a detailed
+analysis of an example system of two quantum dots, including spin-orbit
+effects.",0708.0644v1
+2015-05-06,Bipolar polaron pair recombination in P3HT/PCBM solar cells,"The unique properties of organic semiconductors make them versatile base
+materials for many applications ranging from light emitting diodes to
+transistors. The low spin-orbit coupling typical for carbon-based materials and
+the resulting long spin lifetimes give rise to a large influence of the
+electron spin on charge transport which can be exploited in spintronic devices
+or to improve solar cell efficiencies. Magnetic resonance techniques are
+particularly helpful to elucidate the microscopic structure of paramagnetic
+states in semiconductors as well as the transport processes they are involved
+in. However, in organic devices the nature of the dominant spin-dependent
+processes is still subject to considerable debate. Using multi-frequency pulsed
+electrically detected magnetic resonance (pEDMR), we show that the
+spin-dependent response of P3HT/PCBM solar cells at low temperatures is
+governed by bipolar polaron pair recombination involving the positive and
+negative polarons in P3HT and PCBM, respectively, thus excluding a unipolar
+bipolaron formation as the main contribution to the spin-dependent charge
+transfer in this temperature regime. Moreover the polaron-polaron coupling
+strength and the recombination times of polaron pairs with parallel and
+antiparallel spins are determined. Our results demonstrate that the pEDMR pulse
+sequences recently developed for inorganic semiconductor devices can very
+successfully be transferred to the study of spin and charge transport in
+organic semiconductors, in particular when the different polarons can be
+distinguished spectrally.",1505.01411v1
+2015-09-17,A magnetic Impurity in a Weyl semimetal,"We utilize the variational method to study the Kondo screening of a
+spin-$1/2$ magnetic impurity in a three-dimensional (3D) Weyl semimetal with
+two Weyl nodes along the $k_z$-axis. The model reduces to a 3D Dirac semimetal
+when the separation of the two Weyl nodes vanishes. When the chemical potential
+lies at the nodal point, $\mu=0$, the impurity spin is screened only if the
+coupling between the impurity and the conduction electron exceeds a critical
+value. For finite but small $\mu$, the impurity spin is weakly bound due to the
+low density of state, which is proportional to $\mu^2$, contrary to that in a
+2D Dirac metal such as graphene and 2D helical metal where the density of
+states is proportional to $|\mu|$. The spin-spin correlation function
+$J_{uv}(\mathbf{r})$ between the spin $v$-component of the magnetic impurity at
+the origin and the spin $u$-component of a conduction electron at spatial point
+$\mathbf{r}$, is found to be strongly anisotropic due to the spin-orbit
+coupling, and it decays in the power-law. The main difference of the Kondo
+screening in 3D Weyl semimetals and in Dirac semimetals is in the spin $x$-
+($y$-) component of the correlation function in the spatial direction of the
+$z$-axis.",1509.05180v2
+2020-07-16,Direct measurement of electron intervalley relaxation in a Si/SiGe quantum dot,"The presence of non-degenerate valley states in silicon can drastically
+affect electron dynamics in silicon-based heterostructures, leading to electron
+spin relaxation and spin-valley coupling. In the context of solid-state spin
+qubits, it is important to understand the interplay between spin and valley
+degrees of freedom to avoid or alleviate these decoherence mechanisms. Here we
+report the observation of relaxation from the excited valley state to the
+ground state in a Si/SiGe quantum dot, at zero magnetic field. Valley state
+read-out is aided by a valley-dependent tunneling effect, which we attribute to
+valley-orbit coupling. We find a long intervalley relaxation time of 12.0 $\pm$
+0.3 ms, a value that is unmodified when a magnetic field is applied.
+Furthermore, we compare our findings with the spin relaxation time and find
+that the spin-valley ""hot spot"" relaxation is roughly four times slower than
+intervalley relaxation, consistent with established theoretical predictions.
+The precision of this technique, adapted from electron spin read-out via
+energy-dependent tunneling, is an improvement over indirect valley relaxation
+measurements and could be a useful probe of valley physics in spin and valley
+qubit implementations.",2007.08680v1
+2017-12-17,Harnessing the giant out-of-plane Rashba effect and the nanoscale persistent spin helix via ferroelectricity in SnTe thin films,"A non-vanishing electric field inside a non-centrosymmetric bulk crystal
+transforms into a momentum- dependent magnetic field, namely, a spin-orbit
+field (SOF). SOFs are of great use in spintronics because they enable spin
+manipulation via the electric field. At the same time, however, spintronic
+applications are severely limited by the SOF, as electrons traversing the SOF
+easily lose their spin information. Here, we propose that in-plane
+ferroelectricity in (001)-oriented SnTe thin films harness the Janus-faced SOF
+in a reconcilable way to enable electrical spin controllability and suppress
+spin dephasing. The in-plane ferroelectricity produces a unidirectional
+out-of-plane Rashba SOF that can host a long-lived helical spin mode known as a
+persistent spin helix (PSH). Through direct coupling between the inversion
+asymmetry and the SOF, the ferroelectric switching reverses the out-of-plane
+Rashba SOF, giving rise to a maximally field-tunable PSH. Furthermore, the
+giant out- of-plane Rashba SOF seen in the SnTe thin films is linked to the
+nano-sized PSH, potentially reducing spintronic device sizes to the nanoscale.
+We combine the two ferroelectric-coupled degrees of freedom, longitudinal
+charge and transverse PSH, to design intersectional electro-spintronic
+transistors governed by non-volatile ferroelectric switching within nanoscale
+lateral and atomic-thick vertical dimensions.",1712.06112v3
+2019-07-31,Spin-spiral formalism based on the multiple scattering Green's function technique with applications to ultrathin magnetic films and multilayers,"Based on the Korringa-Kohn-Rostoker Green's function technique we present a
+computational scheme for calculating the electronic structure of layered
+systems with homogeneous spin-spiral magnetic state. From the self-consistent
+non-relativistic calculations the total energy of the spin-spiral states is
+determined as a function of the wave vector, while a relativistic extension of
+the formalism in first order of the spin-orbit coupling gives an access to the
+effect of the Dzyaloshinskii-Moriya interactions. We demonstrate that the newly
+developed method properly describes the magnetic ground state of a Mn monolayer
+on W(001) and that of a Co monolayer on Pt(111). The obtained spin-spiral
+energies are mapped to a classical spin model, the parameters of which are
+compared to those calculated directly from the relativistic torque method. In
+case of the Co/Pt(111) system we find that the isotropic interaction between
+the Co atoms is reduced and the Dzyaloshinskii-Moriya interaction is increased
+when capped by a Ru layer. In addition, we perform spin-spiral calculations on
+Ir/Fe/Co/Pt and Ir/Co/Fe/Pt multilayer systems and find a spin-spiral ground
+state with very long wavelength due to the frustrated isotropic couplings
+between the Fe atoms, whereas the Dzyaloshinskii-Moriya interaction strongly
+depends on the sequence of the Fe and Co layers.",1907.13328v1
+2022-12-30,Selection rules for ultrafast laser excitation and detection of spin correlations dynamics in a cubic antiferromagnet,"Exchange interactions determine the correlations between microscopic spins in
+magnetic materials. Probing the dynamics of these spin correlations on
+ultrashort length and time scales is, however rather challenging, since it
+requires simultaneously high spatial and high temporal resolution. Recent
+experimental demonstrations of laser-driven two-magnon modes - zone-edge
+excitations in antiferromagnets governed by exchange coupling - posed questions
+about the microscopic nature of the observed spin dynamics, the mechanism
+underlying its excitation, and their macroscopic manifestation enabling
+detection. Here, on the basis of a simple microscopic model, we derive the
+selection rules for cubic systems that describe the polarization of pump and
+probe pulses required to excite and detect dynamics of nearest-neighbor spin
+correlations, and can be employed to isolate such dynamics from other magnetic
+excitations and magneto-optical effects. We show that laser-driven spin
+correlations contribute to optical anisotropy of the antiferromagnet even in
+the absence of spin-orbit coupling. In addition, we highlight the role of
+subleading anisotropy in the spin system and demonstrate that the dynamics of
+the antiferromagnetic order parameter occurs only in next-to-leading order,
+determined by the smallness of the magnetic anisotropy as compared to the
+isotropic exchange interactions in the system. We expect that our results will
+stimulate and support further studies of magnetic correlations on the shortest
+length and time scale.",2212.14698v2
+2011-10-17,Quantum oscillations in the linear chain of coupled orbits: the organic metal with two cation layers theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)),"Analytical formulae for de Haas-van Alphen (dHvA) oscillations in linear
+chain of coupled two-dimensional (2D) orbits (Pippard's model) are derived
+systematically taking into account the chemical potential oscillations in
+magnetic field. Although corrective terms are observed, basic (alpha) and
+magnetic breakdown-induced (beta and 2beta - alpha) orbits can be accounted for
+by the Lifshits-Kosevich (LK) and Falicov-Stachowiak semiclassical models in
+the explored field and temperature ranges. In contrast, the 'forbidden orbit'
+beta - alpha amplitude is described by a non-LK equation involving a product of
+two classical orbit amplitudes. Furthermore, strongly non-monotonic field and
+temperature dependence may be observed for the second harmonics of basic
+frequencies such as 2alpha and the magnetic breakdown orbit beta + alpha,
+depending on the value of the spin damping factors. These features are in
+agreement with the dHvA oscillation spectra of the strongly 2D organic metal
+theta- theta-(ET)(4)CoBr(4)(C(6)H(4)Cl(2)).",1110.3696v3
+2014-08-26,ESR evidence for partial melting of the orbital order in LaMnO$_3$ below the Jahn-Teller transition,"We report on high-temperature electron spin resonance studies of a detwinned
+LaMnO$_3$ single crystal across the Jahn-Teller transition at $T_{\rm JT}$ =
+750 K. The anisotropy of the linewidth and g-factor reflects the local
+Jahn-Teller distortions in the orbitally ordered phase. A clear jump in the
+linewidth accompanies the Jahn-Teller transition at $T_{\rm JT}$ = 750 K
+confirming that the transition is of first order. Already at $T^*$ = 550 K a
+significant decrease of the reduced linewidth is observed. This temperature
+scale is discussed with respect to the interaction of the $e_g$-electrons of
+the Mn$^{3+}$-ions and the elastic field of the cooperative distortions. Our
+results support a partial melting of the orbital order along the
+antiferromagnetically coupled $b$-axis at $T^*$. The remaining two-dimensional
+orbital ordering within the ferromagnetically coupled $ac$-plane finally
+disappears together with the cooperative distortion at $T_{\rm JT}$. Moreover
+in our discussion we show that elastic strain field interactions can explain
+the melting of the orbital order and, thus, has to be taken into account to
+explain the orbital ordering in LaMnO$_3$.",1408.6160v1
+2018-08-30,Correlations and electronic order in a two-orbital honeycomb lattice model for twisted bilayer graphene,"The recent observation of superconductivity in proximity to an insulating
+phase in twisted bilayer graphene (TBG) at small `magic' twist angles has been
+linked to the existence of nearly-flat bands, which make TBG a fresh playground
+to investigate the interplay between correlations and superconductivity. The
+low-energy narrow bands were shown to be well-described by an effective
+tight-binding model on the honeycomb lattice (the dual of the triangular
+Moir\'e superlattice) with a local orbital degree of freedom. In this paper, we
+perform a strong-coupling analysis of the proposed $\left(p_{x},\,p_{y}\right)$
+two-orbital extended Hubbard model on the honeycomb lattice. By decomposing the
+interacting terms in the particle-particle and particle-hole channels, we
+classify the different possible superconducting, magnetic, and charge
+instabilities of the system. In the pairing case, we pay particular attention
+to the two-component ($d$-wave) pairing channels, which admit vestigial phases
+with nematic or chiral orders, and study their phenomenology. Furthermore, we
+explore the strong-regime by obtaining a simplified spin-orbital exchange model
+which may describe a putative Mott-like insulating state at quarter-filling.
+Our mean-field solution reveals a rich intertwinement between ferro- and
+antiferro-magnetic orders with different types of nematic and magnetic orbital
+orders. Overall, our work provides a solid framework for further investigations
+of the phase diagram of the two-orbital extended Hubbard model in both strong-
+and weak-coupling regimes.",1808.10416v3
+2021-09-28,Charge Singlets and Orbital-Selective Charge Density Wave Transitions,"The possibility of ""orbitally selective Mott transitions"" within a multiband
+Hubbard model, in which one orbital with large on-site electron-electron
+repulsion $U_1$ is insulating and another orbital, to which it is hybridized,
+with small $U_{-1}$, is metallic, is a problem of long-standing debate and
+investigation. In this paper we study an analogous phenomenon, the co-existence
+of metallic and insulating bands in a system of orbitals with different
+electron-phonon coupling (EPC). To this end, we examine two variants of the
+bilayer Holstein model: a uniform bilayer and a ""Holstein-Metal interface""
+where the electron-phonon coupling, $\lambda$, is zero in the ""metallic"" layer.
+In the uniform bilayer Holstein model, charge density wave (CDW) order
+dominates at small interlayer hybridization $t_3$, but decreases and eventually
+vanishes as $t_3$ grows, providing a charge analog of singlet (spin liquid)
+physics. In the interface case, we show that CDW order penetrates into the
+metal layer and forms long-range CDW order at intermediate ratio of inter- to
+intra-layer hopping strengths, $1.4 \lesssim t_3/t \lesssim 3.4$. This is
+consistent with the occurrence of an ""orbitally selective CDW"" regime at weak
+$t_3$ in which the layer with $\lambda_{1} \neq 0$ exhibits long-range charge
+order, but the ""metallic layer"" with $\lambda_{-1}=0$, to which it is
+hybridized, does not.",2109.13482v2
+2009-02-26,On the tidal evolution of Hot Jupiters on inclined orbits,"Tidal friction is thought to be important in determining the long-term
+spin-orbit evolution of short-period extrasolar planetary systems. Using a
+simple model of the orbit-averaged effects of tidal friction, we study the
+evolution of close-in planets on inclined orbits, due to tides. We analyse the
+effects of the inclusion of stellar magnetic braking by performing a
+phase-plane analysis of a simplified system of equations, including the braking
+torque. The inclusion of magnetic braking is found to be important, and its
+neglect can result in a very different system history. We then present the
+results of numerical integrations of the tidal evolution equations, where we
+find that it is essential to consider coupled evolution of the orbital and
+rotational elements, including dissipation in both the star and planet, to
+accurately model the evolution. The main result of our integrations is that for
+typical Hot Jupiters, tidal friction aligns the stellar spin with the orbit on
+a similar time as it causes the orbit to decay. This means that if a planet is
+observed to be aligned, then it probably formed coplanar. This reinforces the
+importance of Rossiter-McLaughlin effect observations in determining the degree
+of spin-orbit alignment in transiting systems. We apply these results to the
+XO-3 system, and constrain the tidal quality factors Q' in both the star and
+planet in this system. Using a model in which inertial waves are excited by
+tidal forcing in the outer convective envelope and dissipated by turbulent
+viscosity, we calculate Q' for a range of F-star models, and find it to vary
+considerably within this class of stars. This means that assuming a single Q'
+applies to all stars is probably incorrect. We propose an explanation for the
+survival of WASP-12 b & OGLE-TR-56 b, in terms of weak dissipation in the star.",0902.4563v1
+2022-03-02,"Machine-learned model Hamiltonian and strength of spin-orbit interaction in strained Mg2X (X = Si, Ge, Sn, Pb)","Machine-learned multi-orbital tight-binding (MMTB) Hamiltonian models have
+been developed to describe the electronic characteristics of intermetallic
+compounds $\rm Mg_2Si, Mg_2Ge, Mg_2Sn$, and $\rm Mg_2Pb$ subject to strain. The
+MMTB models incorporate spin-orbital mediated interactions and they are
+calibrated to the electronic band structures calculated via density functional
+theory (DFT) by a massively parallelized multi-dimensional Monte-Carlo search
+algorithm. The results show that a machine-learned five-band tight-binding
+model reproduces the key aspects of the valence band structures in the entire
+Brillouin zone. The five-band model reveals that compressive strain localizes
+the contribution of the $3s$ orbital of $\rm Mg$ to the conduction bands and
+the outer shell $p$ orbitals of $\rm X~(X=Si,Ge,Sn,Pb)$ to the valence bands.
+In contrast, tensile strain has a reversed effect as it weakens the
+contribution of the $3s$ orbital of $\rm Mg$ and the outer shell $p$ orbitals
+of $\rm X$ to the conduction bands and valence bands, respectively. The $\pi$
+bonding in the $\rm Mg_2X$ compounds is negligible compared to the $\sigma$
+bonding components, which follow the hierarchy
+$|\sigma_{sp}|>|\sigma_{pp}|>|\sigma_{ss}|$, and the largest variation against
+strain belongs to $\sigma_{pp}$. The five-band model allows for estimating the
+strength of spin-orbit coupling (SOC) in $\rm Mg_2X$ and obtaining its
+dependence on the atomic number of $\rm X$ and strain. Further, the band
+structure calculations demonstrate a significant band gap tuning and band
+splitting due to strain. A compressive strain of $-10\%$ can open a band gap at
+the $\Gamma$ point in metallic $\rm Mg_2Pb$, whereas a tensile strain of
+$+10\%$ closes the semiconducting band gap of $\rm Mg_2Si$. A tensile strain of
+$+5\%$ removes the three-fold degeneracy of valence bands at the $\Gamma$ point
+in semiconducting $\rm Mg_2Ge$.",2203.01353v3
+2020-10-21,Orbit topology analysed from $π$ phase shift of magnetic quantum oscillations in three-dimensional Dirac semimetal,"With the emergence of Dirac fermion physics in the field of condensed matter,
+magnetic quantum oscillations (MQOs) have been used to discern the topology of
+orbits in Dirac materials. However, many previous researchers have relied on
+the single-orbit Lifshiftz-Kosevich formula, which overlooks the significant
+effect of degenerate orbits on MQOs. Since the single-orbit LK formula is valid
+for massless Dirac semimetals with small cyclotron masses, it is imperative to
+generalize the method applicable to a wide range of Dirac semimetals, whether
+massless or massive. This report demonstrates how spin-degenerate orbits affect
+the phases in MQOs of three-dimensional massive Dirac semimetal, NbSb$_2$. With
+varying the direction of the magnetic field, an abrupt $\pi$ phase shift is
+observed due to the interference between the spin-degenerate orbits. We
+investigate the effect of cyclotron mass on the $\pi$ phase shift and verify
+its close relation to the phase from the Zeeman coupling. We find that the
+$\pi$ phase shift occurs when the cyclotron mass is 1/2 of the electron mass,
+indicating the effective spin gyromagnetic ratio is $g_s$ = 2. Our approach is
+not only useful for analysing MQOs of massless Dirac semimetals with a small
+cyclotron mass, but also can be used for MQOs in massive Dirac materials with
+degenerate orbits, especially in topological materials with a sufficiently
+large cyclotron mass. Furthermore, this method provides a useful way to
+estimate the precise $g_s$ value of the material.",2010.10826v3
+2004-08-17,Two-photon spin injection in semiconductors,"A comparison is made between the degree of spin polarization of electrons
+excited by one- and two-photon absorption of circularly polarized light in bulk
+zincblende semiconductors. Time- and polarization-resolved experiments in
+(001)-oriented GaAs reveal an initial degree of spin polarization of 49% for
+both one- and two-photon spin injection at wavelengths of 775 and 1550 nm, in
+agreement with theory. The macroscopic symmetry and microscopic theory for
+two-photon spin injection are reviewed, and the latter is generalized to
+account for spin-splitting of the bands. The degree of spin polarization of
+one- and two-photon optical orientation need not be equal, as shown by
+calculations of spectra for GaAs, InP, GaSb, InSb, and ZnSe using a 14x14 k.p
+Hamiltonian including remote band effects. By including the higher conduction
+bands in the calculation, cubic anisotropy and the role of allowed-allowed
+transitions can be investigated. The allowed-allowed transitions do not
+conserve angular momentum and can cause a high degree of spin polarization
+close to the band edge; a value of 78% is calculated in GaSb, but by varying
+the material parameters it could be as high as 100%. The selection rules for
+spin injection from allowed-allowed transitions are presented, and interband
+spin-orbit coupling is found to play an important role.",0408386v1
+2007-01-04,Rashba interferometers: Spin-dependent single and two-electron interference,"Quantum transport in semiconductor nanostructures can be described
+theoretically in terms of the propagation and scattering of electron
+probability waves. Within this approach, elements of a phase-coherent electric
+circuit play a role similar to quantum-optical devices that can be
+characterised by scattering matrices. Electronic analogues of well-know optical
+interferometers have been fabricated and used to study special features of
+charge carriers in solids. We present results from our theoretical
+investigation into the interplay between spin precession and quantum
+interference in an electronic Mach-Zehnder interferometer with spin-orbit
+coupling of the Rashba type. Intriguing spin-dependent transport effects occur,
+which can be the basis for novel spintronic devices such as a magnet-less
+spin-controlled field-effect transistor and a variety of single-qubit gates.
+Their functionality arises entirely from spin-dependent interference of each
+single input electron with itself. We have also studied two-electron
+interference effects for the spin-dependent Mach-Zehnder interferometer,
+obtaining analytical expressions for its two-fermion-state scattering matrix.
+Using this result, we consider ways to generate two-electron output states for
+which the Rashba spin-subband quantum number and the output-arm index are
+entangled. Combining spin-dependent interference in our proposed Mach-Zehnder
+interferometer with a projective charge measurement at the output enables
+entanglement generation. As our particular scheme involves tuneable spin
+precession, electric-field control of entanglement production can be achieved.",0701065v3
+2014-09-14,All-optical formation of coherent dark states of silicon-vacancy spins in diamond,"Spin impurities in diamond can be versatile tools for a wide range of
+solid-state-based quantum technologies, but finding spin impurities which offer
+sufficient quality in both photonic and spin properties remains a challenge for
+this pursuit. The silicon-vacancy center has recently attracted a lot of
+interest due to its spin-accessible optical transitions and the quality of its
+optical spectrum. Complementing these properties, spin coherence is essential
+for the suitability of this center as a spin-photon quantum interface. Here, we
+report all-optical generation of coherent superpositions of spin states in the
+ground state of a negatively charged silicon-vacancy center using coherent
+population trapping. Our measurements reveal a characteristic spin coherence
+time, T2*, exceeding 250 nanoseconds at 4 K. We further investigate the role of
+phonon-mediated coupling between orbital states as a source of irreversible
+decoherence. Our results indicate the feasibility of all-optical coherent
+control of silicon-vacancy spins using ultrafast laser pulses.",1409.4069v1
+2015-09-05,Antiferromagnetic nuclear spin helix and topological superconductivity in $^{13}$C nanotubes,"We investigate the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction arising
+from the hyperfine coupling between localized nuclear spins and conduction
+electrons in interacting $^{13}$C carbon nanotubes. Using the Luttinger liquid
+formalism, we show that the RKKY interaction is sublattice dependent,
+consistent with the spin susceptibility calculation in noninteracting carbon
+nanotubes, and it leads to an antiferromagnetic nuclear spin helix in
+finite-size systems. The transition temperature reaches up to tens of mK, due
+to a strong boost by a positive feedback through the Overhauser field from
+ordered nuclear spins. Similar to GaAs nanowires, the formation of the helical
+nuclear spin order gaps out half of the conduction electrons, and is therefore
+observable as a reduction of conductance by a factor of 2 in a transport
+experiment. The nuclear spin helix leads to a density wave combining spin and
+charge degrees of freedom in the electron subsystem, resulting in synthetic
+spin-orbit interaction, which induces non-trivial topological phases. As a
+result, topological superconductivity with Majorana fermion bound states can be
+realized in the system in the presence of proximity-induced superconductivity
+without the need of fine tuning the chemical potential. We present the phase
+diagram as a function of system parameters, including the pairing gaps, the gap
+due to the nuclear spin helix, and the Zeeman field perpendicular to the
+helical plane.",1509.01685v2
+2020-07-07,Spin shuttling in a silicon double quantum dot,"The transport of quantum information between different nodes of a quantum
+device is among the challenging functionalities of a quantum processor. In the
+context of spin qubits, this requirement can be met by coherent electron spin
+shuttling between semiconductor quantum dots. Here we theoretically study a
+minimal version of spin shuttling between two quantum dots. To this end, we
+analyze the dynamics of an electron during a detuning sweep in a silicon double
+quantum dot (DQD) occupied by one electron. Possibilities and limitations of
+spin transport are investigated. Spin-orbit interaction and the Zeeman effect
+in an inhomogeneous magnetic field play an important role for spin shuttling
+and are included in our model. Interactions that couple the position, spin and
+valley degrees of freedom open a number of avoided crossings in the spectrum
+allowing for diabatic transitions and interfering paths. The outcomes of single
+and repeated spin shuttling protocols are explored by means of numerical
+simulations and an approximate analytical model based on the solution of the
+Landau--Zener problem. We find that a spin infidelity as low as $1-F_s\lesssim
+0.002$ with a relatively fast level velocity of $\alpha = 600\, {\mu}$eV/ns is
+feasible for optimal choices of parameters or by making use of constructive
+interference.",2007.03598v1
+2011-11-22,Multivalley spin relaxation in $n$-type bulk GaAs in the presence of high electric fields,"Multivalley spin relaxation in $n$-type bulk GaAs in the presence of high
+electric field is investigated from the microscopic kinetic spin Bloch equation
+approach with the $\Gamma$ and $L$ valleys included. We show that the spin
+relaxation time decreases monotonically with the electric field, which differs
+from the two-dimensional case and is recognized due to to the cubic form of the
+Dresselhauss spin-orbit coupling of the $\Gamma$ valley in bulk. In addition to
+the direct modulation of the spin relaxation time, the electric field also
+strongly influences the density and temperature dependences of the spin
+relaxation. In contrast to the monotonic decrease with increasing lattice
+temperature in the field-free condition, the spin relaxation time is shown to
+decrease more slowly under the influence of the electric field and even to
+increase monotonically in the case with small electron density and high
+electric field. We even predict a peak in weakly doped samples under moderate
+electric field due to the anomalous lattice-temperature dependence of the
+hot-electron temperature. As for the $L$ valleys, we show that instead of
+playing the role of a ""drain"" of the total spin polarization as in quantum well
+systems, in bulk they serve as a ""momentum damping area"", which prevents
+electrons from drifting to higher momentum states. This tends to suppress the
+inhomogeneous broadening and hence leads to an increase of the spin relaxation
+time.",1111.5353v1
+2020-12-29,Observation of spin-momentum-layer locking in centrosymmetric BiOI,"Spin polarization effects in nonmagnetic materials are generally believed as
+an outcome of spin-orbit coupling provided that the global inversion symmetry
+is lacking, also known as 'spin-momentum locking'. The recently discovered
+hidden spin polarization indicates that specific atomic site asymmetry could
+also induce measurable spin polarization, leading to a paradigm shift to
+centrosymmetric crystals for potential spintronic applications. Here, combining
+spin- and angle-resolved photoemission spectroscopy and theoretical
+calculations, we report distinct spin-layer locking phenomena surrounding
+different high-symmetry momenta in a centrosymmetric, layered material BiOI.
+The measured spin is highly polarized along the Brillouin zone boundary, while
+is almost vanishing around the zone center due to its nonsymmorphic crystal
+structure. Our work not only demonstrates the existence of hidden spin
+polarization, but also uncovers the microscopic mechanism of the way spin,
+momentum and layer locking to each other, shedding lights on the design metrics
+for future spintronic devices.",2012.14807v1
+2019-08-21,Tunable room-temperature spin galvanic and spin Hall effects in van der Waals heterostructures,"Spin-orbit coupling stands as a powerful tool to interconvert charge and spin
+currents and to manipulate the magnetization of magnetic materials through the
+spin torque phenomena. However, despite the diversity of existing bulk
+materials and the recent advent of interfacial and low-dimensional effects,
+control of the interconvertion at room-temperature remains elusive. Here, we
+unequivocally demonstrate strongly enhanced room-temperature spin-to-charge
+(StC) conversion in graphene driven by the proximity of a semiconducting
+transition metal dichalcogenide(WS2). By performing spin precession experiments
+in properly designed Hall bars, we separate the contributions of the spin Hall
+and the spin galvanic effects. Remarkably, their corresponding conversion
+effiencies can be tailored by electrostatic gating in magnitude and sign,
+peaking nearby the charge neutrality point with a magnitude that is comparable
+to the largest efficiencies reported to date. Such an unprecedented
+electric-field tunability provides a new building block for spin generation
+free from magnetic materials and for ultra-compact magnetic memory
+technologies.",1908.07868v1
+2019-08-25,All-electrical creation and control of giant spin-galvanic effect in 1T-MoTe2/graphene heterostructures at room temperature,"The ability to engineer new states of matter and to control their electronic
+and spintronic properties by electric fields is at the heart of the modern
+information technology and driving force behind recent advances in van der
+Waals (vdW) heterostructures of two-dimensional materials. Here, we exploit a
+proximity-induced Rashba-Edelstein (REE) effect in vdW heterostructures of Weyl
+semimetal candidate MoTe2 and CVD graphene, where an unprecedented
+gate-controlled switching of spin-galvanic effect emerges due to an efficient
+spin-to-charge conversion at room temperature. The magnitude of the measured
+spin-galvanic signal is found to be an order of magnitude larger than the other
+systems, giving rise to a giant REE. The magnitude and the sign of the
+spin-galvanic signal are shown to be strongly modulated by gate electric field
+near the charge neutrality point, which can be understood considering the spin
+textures of the Rashba spin-orbit coupling-induced spin-splitting in conduction
+and valence bands of the heterostructure. These findings open opportunities for
+utilization of gate-controlled switching of spin-galvanic effects in spintronic
+memory and logic technologies and possibilities for realization of new states
+of matter with novel spin textures in vdW heterostructures with gate-tunable
+functionalities.",1908.09367v2
+2019-06-11,"Intrinsic persistent spin helix in two-dimensional group-IV monochalcogenide MX (M : Sn, Ge; X: S, Se, Te) monolayer","Energy-saving spintronics are believed to be implementable on the systems
+hosting persistent spin helix (PSH) since they support an extraordinarily long
+spin lifetime of carriers. However, achieving the PSH requires a unidirectional
+spin configuration in the momentum space, which is practically non-trivial due
+to the stringent conditions for fine-tuning the Rashba and Dresselhaus
+spin-orbit couplings. Here, we predict that the PSH can be intrinsically
+achieved on a two-dimensional (2D) group-IV monochalcogenide M X monolayer, a
+new class of the noncentrosymmetric 2D materials having in-plane
+ferroelctricity. Due to the C2v point group symmetry in the MX monolayer, a
+unidirectional spin configuration is preserved in the out-of-plane direction
+and thus maintains the PSH that is similar to the [110] Dresselhaus model in
+the [110]-oriented quantum well. Our first-principle calculations on various MX
+(M : Sn, Ge; X: S, Se, Te) monolayers confirmed that such typical spin
+configuration is observed, in particular, at near the valence band maximum
+where a sizable spin splitting and a substantially small wavelength of the spin
+polarization are achieved. Importantly, we observe reversible out-of-plane spin
+orientation under opposite in-plane ferroelectric polarization, indicating that
+an electrically controllable PSH for spintronic applications is plausible.",1906.04337v2
+2021-01-05,Symmetry and Control of Spin-Scattering Processes in Two-Dimensional Transition Metal Dichalcogenides,"Transition metal dichalcogenides (TMDs) combine interesting optical and
+spintronic properties in an atomically-thin material, where the light
+polarization can be used to control the spin and valley degrees-of-freedom for
+the development of novel opto-spintronic devices. These promising properties
+emerge due to their large spin-orbit coupling in combination with their crystal
+symmetries. Here, we provide simple symmetry arguments in a group-theory
+approach to unveil the symmetry-allowed spin scattering mechanisms, and
+indicate how one can use these concepts towards an external control of the spin
+lifetime. We perform this analysis for both monolayer (inversion asymmetric)
+and bilayer (inversion symmetric) crystals, indicating the different mechanisms
+that play a role in these systems. We show that, in monolayer TMDs, electrons
+and holes transform fundamentally differently -- leading to distinct
+spin-scattering processes. We find that one of the electronic states in the
+conduction band is partially protected by time-reversal symmetry, indicating a
+longer spin lifetime for that state. In bilayer and bulk TMDs, a hidden
+spin-polarization can exist within each layer despite the presence of global
+inversion symmetry. We show that this feature enables control of the interlayer
+spin-flipping scattering processes via an out-of-plane electric field,
+providing a mechanism for electrical control of the spin lifetime.",2101.01565v3
+2023-07-30,Stationary equilibrium torus supported by Weyssenhoff ideal spin fluid in Schwarzschild spacetime -- I: Case of constant specific angular momentum distribution,"We consider a non-self-gravitating geometrically thick torus described by
+Weyssenhoff ideal spin fluid in a black hole spacetime. The Weyssenhof spin
+fluid shares the same symmetries of the background geometry, i,e. stationarity
+and axisymmetry and further describes circular orbital motion in the black hole
+spacetime. We further assume that assume the alignment of the spin is
+perpendicular to the equatorial plane. Under this setup, we determine the
+integrability conditions of the general relativistic momentum conservation
+equation of Weyssenhoff ideal spin fluid using the Frenkel spin supplementary
+condition. In the light of the integrability conditions, we then present
+stationary equilibrium solutions of the spin fluid torus with constant specific
+angular momentum distributions around the Schwarzschild black hole by
+numerically solving the general relativistic momentum conservation equation.
+Our study reveals that both the iso-pressure and iso-density surfaces of torus
+get significantly modified in comparison to the ideal fluid torus without a
+spin fluid, owing to the spin tensor and its coupling to the curvature of the
+Schwarzschild black hole. In fact, the size of the torus is also found to be
+enhanced (diminished) depending on positive (negative) magnitude of spin
+parameter $s_0$. We finally estimate the magnitude of $s_0$ by assuming the
+torus to be composed of spin-1/2 particles.",2307.16292v1
+2024-01-25,Room temperature nonlocal detection of charge-spin interconversion in a topological insulator,"Topological insulators (TIs) are emerging materials for next-generation
+low-power nanoelectronic and spintronic device applications. TIs possess
+non-trivial spin-momentum locking features in the topological surface states in
+addition to the spin-Hall effect (SHE), and Rashba states due to high
+spin-orbit coupling (SOC) properties. These phenomena are vital for observing
+the charge-spin conversion (CSC) processes for spin-based memory, logic and
+quantum technologies. Although CSC has been observed in TIs by potentiometric
+measurements, reliable nonlocal detection has so far been limited to cryogenic
+temperatures up to T = 15 K. Here, we report nonlocal detection of CSC and its
+inverse effect in the TI compound Bi1.5Sb0.5Te1.7Se1.3 at room temperature
+using a van der Waals heterostructure with a graphene spin-valve device. The
+lateral nonlocal device design with graphene allows observation of both
+spin-switch and Hanle spin precession signals for generation, injection and
+detection of spin currents by the TI. Detailed bias- and gate-dependent
+measurements in different geometries prove the robustness of the CSC effects in
+the TI. These findings demonstrate the possibility of using topological
+materials to make all-electrical room-temperature spintronic devices.",2401.14262v1
+2008-06-28,Spin-dependent scattering in a silicon transistor,"The scattering of conduction electrons off neutral donors depends sensitively
+on the relative orientation of their spin states. We present a theory of
+spin-dependent scattering in the two dimensional electron gas (2DEG) of field
+effect transistors. Our theory shows that the scattering mechanism is dominated
+by virtual transitions to negatively ionized donor levels. This effect
+translates into a source-drain current that always gets reduced when donor
+spins are at resonance with a strong microwave field. We propose a model for
+donor impurities interacting with conduction electrons in a silicon transistor,
+and compare our explicit numerical calculations to electrically detected
+magnetic resonance (EDMR) experiments. Remarkably, we show that EDMR is optimal
+for donors placed into a sweet spot located at a narrow depth window quite far
+from the 2DEG interface. This allows significant optimization of spin signal
+intensity for the minimal number of donors placed into the sweet spot, enabling
+the development of single spin readout devices. Our theory reveals an
+interesting dependence on conduction electron spin polarization p_c. As p_c
+increases upon spin injection, the EDMR amplitude first increases as p_{c}^{2},
+and then saturates when a polarization threshold p_T is reached. These results
+show that it is possible to use EDMR as an in-situ probe of carrier spin
+polarization in silicon and other materials with weak spin-orbit coupling.",0806.4638v3
+2021-09-15,Electronic Impurity Scattering Induced Spin Accumulation in Metallic Thin Films,"In order to explore the spin accumulation, evaluating the spin galvanic and
+spin Hall effect, we utilize the semi-classical Boltzmann equation based on
+input from the relativistic Korringa-Kohn-Rostoker Green's function method,
+within the density functional theory. We calculate the spin accumulation
+including multiple contributions, especially skew-scattering (scattering-in
+term) and compare this to three different approximations, which include the
+isotropic and anisotropic relaxation time approximation. For heavy metals, with
+strong intrinsic spin-orbit coupling, we find that almost all the effects are
+captured within the anisotropic relaxation time approximation. On the other
+hand, in light metals the contributions from the vertex corrections
+(scattering-in term) are comparable to the induced effect in anisotropic
+relaxation time approximation. We put a particular focus on the influence of
+the atomic character of the substitutional impurities on the spin accumulation
+as well as the dependence on the impurity position. As impurities will break
+space inversion symmetry of the thin film, this will give rise to both
+symmetric and antisymmetric contributions to the spin accumulation. In general,
+we find the impurities at the surface generate the largest efficiency of
+charge-to-spin conversion in case of the spin accumulation. Comparing our
+results to existing experimental findings for Pt we find a good agreement.",2109.07271v2
+2021-10-11,Topological phonons in an inhomogeneously strained silicon-4: Large spin dependent thermoelectric response and thermal spin transfer torque due to topological electronic magnetism of phonons,"The superposition of flexoelectronic doping and topological phonons give rise
+to topological electronic magnetism of phonon in an inhomogeneously strained Si
+in the bilayer structure with metal. In case of ferromagnetic metal and Si
+bilayer structure, the flexoelectronic doping will also give rise to larger
+spin current, which will lead to large spin to charge conversion due to
+topological electronic magnetism of phonon. By applying a temperature
+difference to ferromagnetic metal/Si bilayer structure under an applied strain
+gradient, a large thermoelectric response can be generated. In this
+experimental study, we report a large spin dependent thermoelectric response at
+Ni80Fe20/Si bilayer structure. The spin dependent response is found to be an
+order of magnitude larger than that in Pt thin films and similar to topological
+insulators surface states in spite of negligible intrinsic spin-orbit coupling
+of Si. This large response is attributed to the flexoelectronic doping and
+topological electronic magnetism of phonons, which was uncovered using
+topological Nernst effect measurement. This alternative and novel approach of
+using inhomogeneous strain engineering to address both spin current density and
+spin to charge conversion can open a new window to the realization of
+spintronics and spin-caloritronics devices using metal and doped-semiconductor
+layered materials.",2110.04939v1
+2022-07-06,Calculating the spin memory loss at Cu$|$metal interfaces from first principles,"The role played by interfaces in metallic multilayers is not only to change
+the momenta of incident electrons; their symmetry lowering also results in an
+enhancement of the effects of spin-orbit coupling, in particular the flipping
+of the spins of conduction electrons. This leads to a significant reduction of
+a spin current through a metallic interface that is quantitatively
+characterized by a dimensionless parameter $\delta$ called the spin memory loss
+(SML) parameter, the interface counterpart of the spin-flip diffusion length
+for bulk metals. In this paper we use first-principles scattering calculations
+that include temperature-induced lattice and spin disorder to systematically
+study three parameters that govern spin transport through metallic interfaces
+of Cu with Pt, Pd, Py (permalloy) and Co: the interface resistance, spin
+polarization and the SML. The value of $\delta$ for a Cu$|$Pt interface is
+found to be comparable to what we recently reported for a Au$|$Pt interface
+[Gupta {\it et al.}, Phys. Rev. Lett. 124, 087702 (2020)]. For Cu$|$Py and
+Cu$|$Co interfaces, $\delta$ decreases monotonically with increasing
+temperature to become negligibly small at room temperature. The calculated
+results are in good agreement with currently available experimental values in
+the literature. Inserting a Cu layer between Pt and the Py or Co layers
+slightly increases the total spin current dissipation at these ""compound""
+interfaces.",2207.02395v1
+2023-05-25,Photogalvanic effect induced charge and spin photocurrent in group-V monolayer systems,"Photogalvanic effect (PGE) occurs in materials with non-centrosymmetric
+structures when irradiated by linearly or circularly polarized light. Here,
+using non-equilibrium Green's function combined with density functional theory
+(NEGF-DFT), we investigated the linear photogalvanic effect (LPGE) in
+monolayers of group-V elements (As, Sb, and Bi) by first-principles
+calculations. First, by designing a two-probe structure based on the group-V
+elements, we found a giant anisotropy photoresponse of As between the armchair
+and zigzag directions. Then, we analyzed Sb and Bi's charge and spin
+photocurrent characteristics when considering the spin-orbit coupling (SOC)
+effect. It is found that when the polarization direction of linearly polarized
+light is parallel or perpendicular to the transport direction ($\theta$ = $0^
+\circ$ or $90^ \circ$), the spin up and spin down photoresponse in the armchair
+direction has the same magnitude and direction, leading to the generation of
+net charge current. However, in the zigzag direction, the spin up and spin down
+photoresponse have the same magnitude with opposite directions, leading to the
+generation of pure spin current. Furthermore, it is understood by analyzing the
+bulk spin photovoltaic (BSPV) coefficient from the symmetry point of view.
+Finally, we found that the net charge current generated in the armchair
+direction and the pure spin current generated in the zigzag direction can be
+further tuned with the increase of the material's buckling height $|h|$. Our
+results highlight that these group-V monolayers are promising candidates for
+novel functional materials, which will provide a broad prospect for the
+realization of ultrathin ferroelectric devices in optoelectronics due to their
+spontaneous polarization characteristics and high Curie temperature.",2305.16032v1
+2023-12-12,Photonic spin Hall effect in Haldane materials,"The photonic spin Hall effect of light beams reflected from the surfaces of
+various two-dimensional hexagonal crystalline structures, considering their
+associated time-reversal $\mathcal{T}$ and inversion $\mathcal{I}$ symmetries,
+is investigated. Employing the Haldane model with tunable parameters as a
+generic model, we examine the longitudinal and transverse spin-separations of
+the reflected beam in both topological non-trivial and trivial systems. The
+study reveals that the sign switching of the PSHE in these materials is
+attributed to the non-trivial and trivial topology. By manipulating the
+interplay between spin-orbit coupling and external electric fields, we
+demonstrate topological phase transitions in buckled Xene monolayer materials
+through the photonic spin Hall effect. Different behaviors of the photonic spin
+Hall effect are observed in various topological phases within these materials.
+Additionally, we explore the reflected spin and valley-polarized spatial shifts
+in monolayer transition metal dichalcogenides. The photonic spin Hall effect in
+buckled Xene monolayer materials and transition metal dichalcogenides is highly
+influenced by the spin and valley degrees of freedom of charge carriers,
+offering a promising avenue to explore spintronics and valleytronics in these
+hexagonal materials. We propose that the photonic spin Hall effect in Haldane
+materials can serve as a metrological tool for optical parameter
+characterization and as a promising method for determining Chern numbers and
+topological phase transitions through direct optical weak measurement
+techniques.",2312.07013v1
+2006-09-13,Room Temperature Reversible Spin Hall Effect,"Reversible spin Hall effect comprising the ""direct"" and ""inverse"" spin Hall
+effects was successfully detected at room temperature. This experimental
+demonstration proves the fundamental relations called Onsager reciprocal
+relations between spin and charge currents. A platinum wire with a strong
+spin-orbit interaction is used not only as a spin current absorber but also as
+a spin current source in the present lateral structure specially designed for
+clear detection of both charge and spin accumulations via the spin-orbit
+interaction. The obtained spin Hall conductivity is much larger than the
+reported value of Aluminum wire because of the larger spin-orbit interaction.",0609304v1
+2010-04-05,Kondo effect in spin-orbit mesoscopic interferometers,"We consider a flux-threaded Aharonov-Bohm ring with an embedded quantum dot
+coupled to two normal leads. The local Rashba spin-orbit interaction acting on
+the dot electrons leads to a spin-dependent phase factor in addition to the
+Aharonov-Bohm phase caused by the external flux. Using the numerical
+renormalization group method, we find a splitting of the Kondo resonance at the
+Fermi level which can be compensated by an external magnetic field. To fully
+understand the nature of this compensation effect, we perform a scaling
+analysis and derive an expression for the effective magnetic field. The
+analysis is based on a tight-binding model which leads to an effective Anderson
+model with a spin-dependent density of states for the transformed lead states.
+We find that the effective field originates from the combined effect of Rashba
+interaction and magnetic flux and that it contains important corrections due to
+electron-electron interactions. We show that the compensating field is an
+oscillatory function of both the spin-orbit and the Aharonov-Bohm phases.
+Moreover, the effective field never vanishes due to the particle-hole symmetry
+breaking independently of the gate voltage.",1004.0670v2
+2010-11-08,"Manipulation of the Land$\acute{\text{e}}$ g-factor in InAs quantum dots through the application of anisotropic gate potentials: Exact diagonalization, numerical and perturbation methods","We study the variation in the Land$\acute{\text{e}}$ g-factor of electron
+spins induced by both anisotropic gate potentials and magnetic fields in InAs
+quantum dots for possible implementation towards solid state quantum computing.
+In this paper, we present analytical expressions and numerical simulations of
+the variation in the Land$\acute{\text{e}}$ g-factor for both isotropic and
+anisotropic quantum dots. Using both analytical techniques and numerical
+simulations, we show that the Rashba spin-orbit coupling has a major
+contribution in the variation of the g-factor with electric fields before the
+regime, where level crossing or anticrossing occurs. In particular, the
+electric field tunability is shown to cover a wide range of g-factor through
+strong Rashba spin-orbit interaction. Another major result of this paper is
+that the anisotropic gate potential gives quenching effect in the orbital
+angular momentum that reduces the variation in the E-field and B-field
+tunability of the g-factor if the area of the symmetric and asymmetric quantum
+dots is held constant. We identify level crossings and anticrossings of the
+electron states in the variation of the Land$\acute{\text{e}}$ g-factor. We
+model the wavefunctions of electron spins and estimate the size of the
+anticrossing for the spin states $|0,-1,+1/2>$ and $|0,0,-1/2>$ corresponding
+to a quantum dot that has been recently studied experimentally (Phys. Rev.
+Lett. \textbf{104}, 246801 (2010)).",1011.1921v2
+2015-11-25,Spin-texture induced by oxygen vacancies in Strontium perovskites (001) surfaces: A theoretical comparison between SrTiO3 and SrHfO3,"The electronic structure of SrTiO3 and SrHfO3 (001) surfaces with oxygen
+vacancies is studied by means of first-principles calculations. We reveal how
+oxygen vacancies within the first atomic layer of the SrTiO3 surface (i) induce
+a large antiferrodistortive motion of the oxygen octahedra at the surface, (ii)
+drive localized magnetic moments on the Ti-3d orbitals close to the vacancies
+and (iii) form a two-dimensional electron gas localized within the first
+layers. The analysis of the spin-texture of this system exhibits a splitting of
+the energy bands according to the Zeeman interaction, lowering of the Ti-3dxy
+level in comparison with dxz and dyz and also an in-plane precession of the
+spins. No Rashba-like splitting for the ground state neither for ab-initio
+molecular dynamics trajectory at 400K is recognized as suggested recently by A.
+F. Santander-Syro et al. [1]. Instead, a sizeable Rashba-like splitting is
+observed when the Ti atom is replaced by a heavier Hf atom with a much larger
+spin-orbit interaction. However, we observe the disappearance of the magnetism
+and the surface two dimensional electron gas when full structural optimization
+of the SrHfO3 surface is performed. Our results uncover the sensitive interplay
+of spin-orbit coupling, atomic relaxations and magnetism when tuning these
+Sr-based perovskites.",1511.08079v1
+2017-03-10,Room-temperature perpendicular magnetization switching through giant spin-orbit torque from sputtered BixSe(1-x) topological insulator material,"The spin-orbit torque (SOT) arising from materials with large spin-orbit
+coupling promises a path for ultra-low power and fast magnetic-based storage
+and computational devices. We investigated the SOT from magnetron-sputtered
+BixSe(1-x) thin films in BixSe(1-x)/CoFeB heterostructures by using a dc planar
+Hall method. Remarkably, the spin Hall angle (SHA) was found to be as large as
+18.83, which is the largest ever reported at room temperature (RT). Moreover,
+switching of a perpendicular CoFeB multilayer using SOT from the BixSe(1-x) has
+been observed with the lowest-ever switching current density reported in a
+bilayer system: 2.3 * 105 A/cm2 at RT. The giant SHA, smooth surface, ease of
+growth of the films on silicon substrate, successful growth and switching of a
+perpendicular CoFeB multilayer on BixSe(1-x) film opens a path for use of
+BixSe(1-x) topological insulator (TI) material as a spin-current generator in
+SOT-based memory and logic devices.",1703.03822v1
+2013-08-08,Imprints of spin-orbit density wave in the hidden order state of URu2Si2,"The mysterious second order quantum phase transition, commonly attributed to
+the `hidden-order' (HO) state, in heavy-fermion metal URu2Si2 exhibits a number
+of paradoxical electronic and magnetic properties which cannot be associated
+with any conventional order parameter. We characterize and reconcile these
+exotic properties of the HO state based on a spin-orbit density wave order
+(SODW), constructed on the basis of a realistic density-functional theory (DFT)
+band structure. We quantify the nature of the gapped electronic and magnetic
+excitation spectrum, in agreement with measurements, while the magnetic moment
+is calculated to be zero owing to the spin-orbit coupling induced time-reversal
+invariance. Furthermore, a new collective mode in the spin-1 excitation
+spectrum is predicted to localize at zero momentum transfer in the HO state
+which can be visualized, for example, by electron spin resonance (ESR) at zero
+magnetic field or polarized inelastic neutron scattering measurements. The
+results demonstrate that the concomitant broken and invariant symmetries
+protected SODW order not only provides insights into numerous nontrivial
+hidden-order phenomena, but also offers a parallel laboratory to the formation
+of a topologically protected quantum state beyond the quantum spin-Hall state
+and Weyl semimetals.",1308.1992v2
+2016-11-10,Andreev spectrum with high spin-orbit interactions: revealing spin splitting and topologically protected crossings,"We investigate numerically the Andreev spectrum of a multichannel mesoscopic
+quantum wire (N) with high spin-orbit interaction coupled to superconducting
+electrodes (S), contrasting topological and non topological behaviors.
+  In the non topological case, modeled by a square lattice with Rashba
+interactions, we find that as soon as the normal quantum wires can host several
+conduction channels, the spin degeneracy of Andreev levels is lifted by a phase
+difference between the S reservoirs which breaks time reversal symmetry in zero
+Zeeman field. The Andreev states remain degenerate at phases multiple of $\pi$
+for which time reversal symmetry is preserved, giving rise to level crossings
+which are not lifted by disorder. In contrast with the dc Josephson current,
+the finite frequency admittance (susceptibility) is very sensitive to these
+level crossings and the lifting of their degeneracy by a small Zeeman field.
+More interesting is the case of the hexagonal lattice with next nearest
+neighbor spin-orbit interactions which exhibit 1D topological helical edge
+states \cite{Kane2005}. The finite frequency admittance carries then a very
+specific signature at low temperature of a protected Andreev level crossing at
+$\pi$ and zero energy in the form of a sharp peak split by a Zeeman field.",1611.03526v1
+2018-05-21,Spin-orbit-driven electron pairing in two dimensions,"We show that the spin-orbit interaction (SOI) arising due to the in-plane
+electric field of the Coulomb repulsion between electrons in a two-dimensional
+quantum well produces an attractive component in the pair interaction
+Hamiltonian that depends on the spins and momenta of electrons. If the Rashba
+SOI constant of the material is high enough the attractive component overcomes
+the Coulomb repulsion and the centrifugal barrier, which leads to the formation
+of the two-electron bound states. There are two distinct types of two-electron
+bound states. The relative bound states are formed by the electrons orbiting
+around their common barycenter. They have the triplet spin structure and are
+independent of the center-of-mass momentum. In contrast, the convective bound
+states are formed because of the center-of-mass motion, which couples the
+electrons with opposite spins. The binding energy in the meV range is
+attainable for realistic conditions.",1805.08216v7
+2017-05-17,Landau quantization in buckled monolayer GaAs,"Magneto-electronic properties of buckled monolayer GaAs is studied by the
+developed generalized tight-binding model, considering the buckled structure,
+multi-orbital chemical bondings, spin-orbit coupling, electric field, and
+magnetic field simultaneously. Three group of spin-polarized Landau levels
+(LLs) near the Fermi level are induced by the magnetic quantization, whose
+initial energies, LL degeneracy, energy spacings, magnetic-field-dependence,
+and spin polarization are investigated. The Landau state probabilities
+describing the oscillation patterns, localization centers, and node
+regularities of the dominated/minor orbitals are analyzed, and their
+energy-dependent variations are discussed. The given density of states directly
+reflects the main features of the LL energy spectra in the structure, height,
+number, and frequency of the spin-polarized LL peaks. The electric field causes
+the monotonous/nonmonotonous LL energy dispersions, LL crossing, gap
+modulation, phase transition and spin splitting enhancement. The complex gap
+modulations and phase transitions based on the competition between magnetic and
+electric fields are explored in detail by the phase diagram. The
+field-controlled gap modulations and phase transitions are helpful in designing
+the top-gated and phase-change electronic devices. These predicted
+magneto-electronic properties could be verified by scanning tunneling
+spectroscopy measurements.",1705.06016v1
+2019-04-08,Effect of orbital eccentricity on the dynamics of precessing compact binaries,"We study precession dynamics of generic binary black holes in eccentric
+orbits using an effective potential based formalism derived in [M. Kesden et
+al., PRL {\bf 114}, 081103 (2015)]. This effective potential is used to
+classify binary black holes into three mutually exclusive spin morphologies.
+During the inspiral phase, binaries make transitions from one morphology to
+others. We evolve a population of binary black holes from an initial separation
+of $1000\mathbf{M}$ to a final separation of $10\mathbf{M}$ using
+post-Newtonian accurate evolution equations. We find that, given suitable
+initial conditions, a binary's eccentricity can follow one of three distinct
+evolutionary patterns: (i) eccentricity monotonically increasing until final
+separation, (ii) eccentricity rising after decaying to a minimum value, and
+(iii) eccentricity monotonically decreasing throughout the inspiral. The
+monotonic growth or growth after reaching a certain minimum of eccentricity is
+due to the effect of 2PN spin-spin coupling. Further, we investigate the
+morphology transitions in eccentric binaries and find that the probability of
+such binaries transiting from one to other is similar to those in circular
+orbits, implying that eccentricity plays a sub-dominant role in spin morphology
+evolution of a precessing binary black hole. We, hence, argue that the
+morphological classification of spin precession dynamics is a robust tool to
+constrain the formation channels of binaries with arbitrary eccentricity as
+well.",1904.03985v2
+2022-10-06,Tunable superconductivity and Möbius Fermi surfaces in an inversion-symmetric twisted van der Waals heterostructure,"We study theoretically a moir\'e superlattice geometry consisting of
+mirror-symmetric twisted trilayer graphene surrounded by identical transition
+metal dichalcogenide layers. We show that this setup allows to switch on/off
+and control the spin-orbit splitting of the Fermi surfaces via application of a
+perpendicular displacement field $D_0$, and explore two manifestations of this
+control: first, we compute the evolution of superconducting pairing with $D_0$;
+this features a complex admixture of singlet and triplet pairing and, depending
+on the pairing state in the parent trilayer system, phase transitions between
+competing superconducting phases. Second, we reveal that, with application of
+$D_0$, the spin-orbit-induced spin textures exhibit vortices which lead to
+""M\""obius fermi surfaces'' in the interior of the Brillouin zone: diabatic
+electron trajectories, which are predicted to dominate quantum oscillation
+experiments, require encircling the $\Gamma$ point twice, making their M\""obius
+nature directly observable. We further show that the superconducting order
+parameter inherits the unconventional, M\""obius spin textures. Our findings
+suggest that this system provides a promising experimental avenue for studying
+systematically the impact of spin-orbit coupling on the multitude of
+topological and correlated phases in near-magic-angle twisted trilayer
+graphene.",2210.03125v1
+2023-08-29,Relativistic and Spin-Orbit Dynamics at Non-Relativistic Intensities in Strong-Field Ionization,"Spin-orbit dynamics and relativistic corrections to the kinetic energy in
+strong-field dynamics, have long been ignored for near- and mid-IR fields with
+intensities $10^{13}$--$10^{14}$ W/cm$^2$, as the final photoelectron energies
+are considered too low for these effects to play a role. However, using a
+precise and flexible path-integral formalism, we include all correction terms
+from the fine-structure, Breit-Pauli Hamiltonian. This enables a treatment of
+spin, through coherent spin-states, which is the first model to use this
+approach in strong-field physics. We are able to show that the most
+energetically rescattered wavepackets, undergo huge momentum transfer and
+briefly reach relativistic velocities, which warrants relativistic kinetic
+energy corrections. We probe these effects and show that they yield notable
+differences for a $1600$ nm wavelength laser field on the dynamics and the
+photoelectron spectra. Furthermore, we find that the dynamical spin-orbit
+coupling is strongly overestimated if relativistic corrections to kinetic
+energy are not considered. Finally, we derive a new condition that demonstrates
+that relativistic effects begin to play a role at intensities orders of
+magnitude lower than expected. Our findings may have important implication for
+imaging processes such as laser-induced electron diffraction, which includes
+high-energy photoelectron recollisions.",2308.15374v1
+1999-06-08,Toward a Theory of Orbiton Dispersion in LaMnO_3,"At 750K, LaMnO_3 has a cooperative Jahn-Teller (JT) distortion, with Mn atoms
+in distorted oxygen octahedra. This lifts the degeneracy of the singly-occupied
+$e_g$ orbitals of the Mn$^{3+}$ ions, which then become orbitally ordered. We
+use a minimal model to describe the ordered phase at T=0. The on-site Coulomb
+repulsion $U$ is set to infinity. There are two electronic orbitals and three
+oxygen vibrational coordinates per unit cell. In addition to spin excitations
+and phonons, the model has electronic excitations consisting of mis-orienting
+orbitals on Mn ions. Neglecting coupling to the oxygen displacements, the gap
+to such excitations is $2\Delta=16g^2/K$ where $g$ is the electron-phonon
+coupling and $K$ is the oxygen spring constant. When static oxygen
+displacements are coupled, this excitation becomes a self-trapped exciton with
+energy $\Delta$, half the JT gap. Adding dynamic oxygen displacements in
+one-phonon approximation introduces dispersion to both the (previously
+Einstein-like) phonons and the orbital excitons (``orbitons''). One of the
+phonon branches has zero frequency at $\vec{k}=(0,0,\pi)$. This is the
+Goldstone mode of the JT broken symmetry.",9906118v1
+2007-10-16,Global quark polarization in non-central $A+A$ collisions,"Partons produced in the early stage of non-central heavy-ion collisions can
+develop a longitudinal fluid shear because of unequal local number densities of
+participant target and projectile nucleons. Under such fluid shear, local
+parton pairs with non-vanishing impact parameter have finite local relative
+orbital angular momentum along the direction opposite to the reaction plane.
+Such finite relative orbital angular momentum among locally interacting quark
+pairs can lead to global quark polarization along the same direction due to
+spin-orbital coupling. Local longitudinal fluid shear is estimated within both
+Landau fireball and Bjorken scaling model of initial parton production. Quark
+polarization through quark-quark scatterings with the exchange of a thermal
+gluon is calculated beyond small-angle scattering approximation in a
+quark-gluon plasma. The polarization is shown to have a non-monotonic
+dependence on the local relative orbital angular momentum dictated by the
+interplay between electric and magnetic interaction. It peaks at a value of
+relative orbital angular momentum which scales with the magnetic mass of the
+exchanged gluons. With the estimated small longitudinal fluid shear in
+semi-peripheral $Au+Au$ collisions at the RHIC energy, the final quark
+polarization is found to be small $|P_q|<0.04$ in the weak coupling limit.
+Possible behavior of the quark polarization in the strong coupling limit and
+implications on the experimental detection of such global quark polarization at
+RHIC and LHC are also discussed.",0710.2943v1
+2001-11-28,Exchange coupling in CaMnO$_3$ and LaMnO$_3$: configuration interaction and the coupling mechanism,"The equilibrium structure and exchange constants of CaMnO$_3$ and LaMnO$_3$
+have been investigated using total energy unrestricted Hartree-Fock (UHF) and
+localised orbital configuration interaction (CI) calculations on the bulk
+compounds and Mn$_2$O$_{11}^{14-}$ and Mn$_2$O$_{11}^{16-}$ clusters. The
+predicted structure and exchange constants for CaMnO$_3$ are in reasonable
+agreement with estimates based on its N\'eel temperature. A series of
+calculations on LaMnO$_3$ in the cubic perovskite structure shows that a
+Hamiltonian with independent orbital ordering and exchange terms accounts for
+the total energies of cubic LaMnO$_3$ with various spin and orbital orderings.
+Computed exchange constants depend on orbital ordering. UHF calculations tend
+to underestimate exchange constants in LaMnO$_3$, but have the correct sign
+when compared with values obtained by neutron scattering; exchange constants
+obtained from CI calculations are in good agreement with neutron scattering
+data provided the Madelung potential of the cluster is appropriate. Cluster CI
+calculations reveal a strong dependence of exchange constants on Mn d e$_g$
+orbital populations in both compounds. CI wave functions are analysed in order
+to determine which exchange processes are important in exchange coupling in
+CaMnO$_3$ and LaMnO$_3$.",0111536v1
+2013-10-28,Metal-insulator transition and superconductivity in the two-orbital Hubbard-Holstein model for iron-based superconductors,"We investigate a two-orbital model for iron-based superconductors to
+elucidate the effect of interplay between electron correlation and Jahn-Teller
+electron-phonon coupling by using the dynamical mean-field theory combined with
+the exact diagonalization method. When the intra- and inter-orbital Coulomb
+interactions, $U$ and $U'$, increase with $U=U'$, both the local spin and
+orbital susceptibilities, $\chi_{s}$ and $\chi_{o}$, increase with
+$\chi_{s}=\chi_{o}$ in the absence of the Hund's rule coupling $J$ and the
+electron-phonon coupling $g$. In the presence of $J$ and $g$, there are
+distinct two regimes: for $J \stackrel{>}{_\sim} 2g^2/\omega_0$ with the phonon
+frequency $\omega_0$, $\chi_{s}$ is enhanced relative to $\chi_{o}$ and shows a
+divergence at $J=J_c$ above which the system becomes Mott insulator, while for
+$J \stackrel{<}{_\sim} 2g^2/\omega_0$, $\chi_{o}$ is enhanced relative to
+$\chi_{s}$ and shows a divergence at $g=g_c$ above which the system becomes
+bipolaronic insulator. In the former regime, the superconductivity is mediated
+by antiferromagnetic fluctuations enhanced due to Fermi-surface nesting and is
+found to be largely dependent on carrier doping. On the other hand, in the
+latter regime, the superconductivity is mediated by ferro-orbital fluctuations
+and is observed for wide doping region including heavily doped case without the
+Fermi-surface nesting.",1310.7327v3
+2010-01-22,Josephson effect through a multilevel dot near a singlet-triplet transition,"We investigate the Josephson effect through a two-level quantum dot with an
+exchange coupling between two dot electrons. We compute the superconducting
+phase relationship and construct the phase diagram in the superconducting
+gap--exchange coupling plane in the regime of the singlet-triplet transition
+driven by the exchange coupling. In our study two configurations for the
+dot-lead coupling are considered: one where effectively only one channel
+couples to the dot, and the other where the two dot orbitals have opposite
+parities. Perturbative analysis in the weak-coupling limit reveals that the
+system experiences transitions from 0 to $\pi$ (negative critical current)
+behavior, depending on the parity of the orbitals and the spin correlation
+between dot electrons. The strong coupling regime is tackled with the numerical
+renormalization group method, which first characterizes the Kondo correlations
+due to the dot-lead coupling and the exchange coupling in the absence of
+superconductivity. In the presence of superconductivity, many-body correlations
+such as two-stage Kondo effect compete with the superconductivity and the
+comparison between the gap and the relevant Kondo temperature scales allows to
+predict a rich variety of phase diagrams for the ground state of the system and
+for the Josephson current. Numerical calculations predicts that our system can
+exhibit Kondo-driven 0-$\pi$-0 or $\pi$-0-$\pi$ double transitions and, more
+interestingly, that if proper conditions are met a Kondo-assisted
+$\pi$-junction can arise, which is contrary to a common belief that the Kondo
+effect opens a resonant level and makes the 0-junction. Our predictions could
+be probed experimentally for a buckminster fullerene sandwiched between two
+superconductors.",1001.3914v1
+2001-09-10,Magnetic-field Manipulation of Chemical Bonding in Artificial Molecules,"The effect of orbital magnetism on the chemical bonding of lateral,
+two-dimensional artificial molecules is studied in the case of a 2e double
+quantum dot (artificial molecular hydrogen). It is found that a perpendicular
+magnetic field reduces the coupling (tunneling) between the individual dots
+and, for sufficiently high values, it leads to complete dissociation of the
+artificial molecule. The method used is building on Lowdin's work on Projection
+Operators in Quantum Chemistry; it is a spin-and-space unrestricted
+Hartree-Fock method in conjunction with the companion step of the restoration
+of spin and space symmetries via Projection Techniques (when such symmetries
+are broken). This method is able to describe the full range of couplings in
+two-dimensional double quantum dots, from the strong-coupling regime exhibiting
+delocalized molecular orbitals to the weak-coupling and dissociation regimes
+associated with a Generalized Valence Bond combination of atomic-type orbitals
+localized on the individual dots.",0109167v1
+2016-06-20,Anisotropic electron-phonon coupling in the spinel oxide superconductor,"Among hundreds of spinel oxides, LiTi2O4 (LTO) is the only one that exhibits
+superconductivity (Tc ~13 K). Although the general electron-phonon coupling is
+still the main mechanism for electron pairing in LTO, unconventional behaviors
+such as the anomalous magnetoresistance, anisotropic orbital/spin
+susceptibilities, etc. reveal that both the spin and the orbital interactions
+should also be considered for understanding the superconductivity. Here, we
+investigate tunneling spectra of [111]-, [110]- and [001]-oriented high quality
+LTO thin films. Several bosonic modes in tunneling spectra are observed in the
+[111]- and [110]-oriented films but not in [001]-oriented ones, and these modes
+still exist at T = 2Tc and beyond the upper critical field, which are confirmed
+as stemming from electron-phonon interaction by DFT calculations. These modes
+only appear in special surface orientations, indicating that the
+electron-phonon coupling in LTO system is highly anisotropic and may be
+enhanced by orbital-related state. The anisotropic electron-phonon coupling
+should be taken seriously in understanding the nature of LTO superconductivity.",1606.06109v3
+2019-11-28,Hund-Heisenberg model in superconducting infinite-layer nickelates,"We theoretically investigate the unconventional superconductivity in the
+newly discovered infinite-layer nickelates Nd$_{1-x}$Sr$_{x}$NiO$_{2}$ based on
+a two-band model. By analyzing the transport experiments, we propose that the
+doped holes dominantly enter the Ni $d_{xy}$ or/and $d_{3z^{2}-r^{2}}$ orbitals
+as charged carriers, and form a conducting band. Via the onsite Hund coupling,
+the doped holes are coupled to the Ni localized holes in the $d_{x^{2}-y^{2}}$
+orbital band. We demonstrate that this two-band model could be further reduced
+to a Hund-Heisenberg model. Using the reduced model, we show the non-Fermi
+liquid state above the critical $T_{c}$ could stem from the carriers coupled to
+the spin fluctuations of the localized holes. In the superconducting phase, the
+short-range spin fluctuations mediate the carriers into Cooper pairs and
+establish $d_{x^{2}-y^{2}}$-wave superconductivity. We further predict that the
+doped holes ferromagnetically coupled with the local magnetic moments remain
+itinerant even at very low temperature, and thus the pseudogap hardly emerges
+in nickelates. Our work provides a new superconductivity mechanism for strongly
+correlated multi-orbital systems and paves a distinct way to exploring new
+superconductors in transition or rare-earth metal oxides.",1911.12731v3
+2021-03-24,Boosting proximity spin orbit coupling in graphene/WSe$_2$ heterostructures via hydrostatic pressure,"Van der Waals heterostructures composed of multiple few layer crystals allow
+the engineering of novel materials with predefined properties. As an example,
+coupling graphene weakly to materials with large spin orbit coupling (SOC)
+allows to engineer a sizeable SOC in graphene via proximity effects. The
+strength of the proximity effect depends on the overlap of the atomic orbitals,
+therefore, changing the interlayer distance via hydrostatic pressure can be
+utilized to enhance the interlayer coupling between the layers. In this work,
+we report measurements on a graphene/WSe$_2$ heterostructure exposed to
+increasing hydrostatic pressure. A clear transition from weak localization to
+weak anti-localization is visible as the pressure increases, demonstrating the
+increase of induced SOC in graphene.",2103.13325v1
+2022-01-18,Magnetic correlation between two local spins in a quantum spin Hall insulator,"Two spins located at the edge of a quantum spin Hall insulator may interact
+with each other via indirect spin-exchange interaction mediated by the helical
+edge states, namely the RKKY interaction, which can be measured by the magnetic
+correlation between the two spins. By means of the newly developed natural
+orbitals renormalization group (NORG) method, we investigated the magnetic
+correlation between two Kondo impurities interacting with the helical edge
+states, based on the Kane-Mele model defined in a finite zigzag graphene
+nanoribbon with spin-orbital coupling (SOC). We find that the SOC effect breaks
+the symmetry in spatial distribution of the magnetic correlation, leading to
+anisotropy in the RKKY interaction. Specifically, the total correlation is
+always ferromagnetic (FM) when the two impurities are located at the same
+sublattice, while it is always antiferromagnetic (AFM) when at the different
+sublattices. Meanwhile, the behavior of the in-plane correlation is consistent
+with that of the total correlation. However, the out-of-plane correlation can
+be tuned from FM to AFM by manipulating either the Kondo coupling or the
+interimpurity distance. Furthermore, the magnetic correlation is tunable by the
+SOC, especially that the out-of-plane correlation can be adjusted from FM to
+AFM by increasing the strength of SOC. Dynamic properties of the system,
+represented by the spin-staggered excitation spectrum and the spin-staggered
+susceptibility at the two impurity sites, are finally explored. It is shown
+that the spin-staggered susceptibility is larger when the two impurities are
+located at the different sublattices than at the same sublattice, which is
+consistent with the behavior of the out-of-plane correlation. On the other
+hand, our study further demonstrates that the NORG is an effective numerical
+method for studying the quantum impurity systems.",2201.06790v1
+2022-02-07,Quantum spin liquids of Rydberg excitations in a honeycomb lattice induced by density-dependent Peierls phases,"We show that the nonlinear transport of bosonic excitations in a
+two-dimensional honeycomb lattice of spin-orbit coupled Rydberg atoms gives
+rise to disordered quantum phases which are candidates for quantum spin
+liquids. As recently demonstrated in [Lienhard et al. Phys. Rev. X, 10, 021031
+(2020)] the spin-orbit coupling breaks time-reversal and chiral symmetries and
+leads to a tunable density-dependent complex hopping of the hard-core bosons or
+equivalently to complex XY spin interactions. Using exact diagonalization (ED)
+we numerically investigate the phase diagram resulting from the competition
+between density-dependent and direct transport terms. In mean-field
+approximation there is a phase transition from a quasi-condensate to a
+120{\deg} phase when the amplitude of the complex hopping exceeds that of the
+direct one. In the full model a new phase with a finite spin gap emerges close
+to the mean-field critical point as a result of quantum fluctuations induced by
+the density-dependence of the complex hopping. We show that this phase is a
+genuine disordered one, has a non-vanishing spin chirality and is characterized
+by a non-trivial many-body Chern number. ED simulations of small lattices with
+up to 28 lattice sites point to a non-degenerate ground state and thus to a
+bosonic integer-quantum Hall (BIQH) phase, protected by U(1) symmetry. The
+Chern number of C = 1, which is robust to disorder, is however different from
+the even Chern numbers found in BIQH phases. For very strong, nonlinear
+hoppings of opposite sign we find another disordered regime with vanishing spin
+gap. This phase also has a large spin chirality and could be a gapless
+spin-liquid but lies outside the parameter regime accessible in the Rydberg
+system.",2202.03860v4
+2023-10-27,"Twist- and gate-tunable proximity spin-orbit coupling, spin relaxation anisotropy, and charge-to-spin conversion in heterostructures of graphene and transition-metal dichalcogenides","We present a DFT-based investigation of the twist-angle dependent proximity
+spin-orbit coupling (SOC) in graphene/TMDC structures. We find that for
+Mo-based TMDCs the proximity valley-Zeeman SOC exhibits a maximum at around
+15--20{\deg}, and vanishes at 30{\deg}, while for W-based TMDCs we find an
+almost linear decrease of proximity valley-Zeeman SOC when twisting from
+0{\deg} to 30{\deg}. The induced Rashba SOC is rather insensitive to twisting,
+while acquiring a nonzero Rashba phase angle, $\varphi \in [-20;40]${\deg}, for
+twist angles different from 0{\deg} and 30{\deg}. This finding contradicts
+earlier tight-binding predictions that the Rashba angle can be 90{\deg} in the
+studied systems. In addition, we study the influence of several tunability
+knobs on the proximity SOC for selected twist angles. By applying a transverse
+electric field in the limits of $\pm 2$ V/nm, mainly the Rashba SOC can be
+tuned by about 50\%. The interlayer distance provides a giant tunability, since
+the proximity SOC can be increased by a factor of 2--3, when reducing the
+distance by about 10\%. Encapsulating graphene between two TMDCs, both twist
+angles are important to control the interference of the individual proximity
+SOCs, allowing to precisely tailor the valley-Zeeman SOC in graphene, while the
+Rashba SOC becomes suppressed. Finally, based on our effective Hamiltonians
+with fitted parameters, we calculate experimentally measurable quantities such
+as spin lifetime anisotropy and charge-to-spin conversion efficiencies. The
+spin lifetime anisotropy can become giant, up to $10^4$, in encapsulated
+structures. The charge-to-spin conversion, which is due to spin-Hall and
+Rashba-Edelstein effects, can lead to twist-tunable non-equilibrium
+spin-density polarizations that are perpendicular and parallel to the applied
+charge current.",2310.17907v1
+2011-09-19,Dynamics of nuclear single-particle structure in covariant theory of particle-vibration coupling: from light to superheavy nuclei,"The impact of particle-vibration coupling and polarization effects due to
+deformation and time-odd mean fields on single-particle spectra is studied
+systematically in doubly magic nuclei from low mass $^{56}$Ni up to superheavy
+ones. Particle-vibration coupling is treated fully self-consistently within the
+framework of relativistic particle-vibration coupling model. Polarization
+effects due to deformation and time-odd mean field induced by odd particle are
+computed within covariant density functional theory. It has been found that
+among these contributions the coupling to vibrations makes a major impact on
+the single-particle structure. The impact of particle-vibration coupling and
+polarization effects on calculated single-particle spectra, the size of the
+shell gaps, the spin-orbit splittings and the energy splittings in pseudospin
+doublets is discussed in detail; these physical observables are compared with
+experiment. Particle-vibration coupling has to be taken into account when model
+calculations are compared with experiment since this coupling is responsible
+for observed fragmentation of experimental levels; experimental spectroscopic
+factors are reasonably well described in model calculations.",1109.3969v1
+2007-09-19,Spin-Orbit Correlations and Single-Spin Asymmetries,"Several examples for the role of orbital angular momentum and spin-orbit
+correlations in hadron structure are discussed.",0709.2966v3
+2020-02-18,Anisotropic RKKY interactions mediated by $j=3/2$ quasiparticles in half-Heusler topological semimetal,"We theoretically explore the RKKY interaction mediated by spin-3/2
+quasiparticles in half-Heusler topological semimetals in quasi-two-dimensional
+geometries. We find that while the Kohn-Luttinger terms gives rise to
+generalized Heisenberg coupling of the form ${\cal H}_{\rm RKKY} \propto
+{\sigma}_{1,i} {\cal I}_{ij} {\sigma}_{2,j}$ with a symmetric matrix ${\cal
+I}_{ij}$, addition of small antisymmetric linear spin-orbit coupling term leads
+to Dzyaloshinskii-Moriya (DM) coupling with an antisymmetric matrix ${\cal
+I}'_{ij}$. We demonstrate that besides the oscillatory dependence on the
+distance, all coupling strengths strongly depend on the relative orientation of
+the two impurities with respect to the lattice. This yields a strongly
+anisotropic behavior for ${\cal I}_{ij}$ such that by only rotating one
+impurity around another at a constant distance, we can see further oscillations
+of the RKKY couplings. This unprecedented effect is unique to our system which
+combines spin-orbit coupling with strongly anisotropic Fermi surfaces. We
+further find that all of the RKKY terms have two common features: a tetragonal
+warping in their map of spatial variations, and a complex beating pattern.
+Intriguingly, all these features survive in all dopings and we see them in both
+electron- and hole-doped cases. In addition, due to the lower dimensionality
+combined with the effects of different spin-orbit couplings, we see that only
+one symmetric off-diagonal term, ${\cal I}_{xy}$ and two DM components ${\cal
+I}'_{xz}$ and ${\cal I}'_{yz}$ are nonvanishing, while the remaining three
+off-diagonal components are identically zero. This manifests another drastic
+difference of RKKY interaction in half-Heusler topological semimetals compared
+to the electronic systems with spin-1/2 effective description.",2002.07736v1
+2007-06-17,Spin-orbital entanglement near quantum phase transitions,"Spin-orbital entanglement in the ground state of a one-dimensional
+SU(2)$\otimes$SU(2) spin-orbital model is analyzed using exact diagonalization
+of finite chains. For $S=1/2$ spins and $T=1/2$ pseudospins one finds that the
+quantum entanglement is similar at the SU(4) symmetry point and in the
+spin-orbital valence bond state. We also show that quantum transitions in
+spin-orbital models turn out to be continuous under certain circumstances, in
+constrast to the discontinuous transitions in spin models with SU(2) symmetry.",0706.2477v1
+2010-09-10,Effect of Electron-Electron Interactions on Rashba-like and Spin-Split Systems,"The role of electron-electron interactions is analyzed for Rashba-like and
+spin-split systems within a tight-binding single-band Hubbard model with
+on-site and all nearest-neighbor matrix elements of the Coulomb interaction. By
+Rashba-like systems we refer to the Dresselhaus and Rashba spin-orbit coupled
+phases; spin-split systems have spin-up and spin-down Fermi surfaces shifted
+relative to each other. Both systems break parity but preserve time-reversal
+symmetry. They belong to a class of symmetry-breaking ground states that
+satisfy: (i) electron crystal momentum is a good quantum number (ii) these
+states have no net magnetic moment and (iii) their distribution of `polarized
+spin' in momentum space breaks the lattice symmetry. In this class, the
+relevant Coulomb matrix elements are found to be nearest-neighbor exchange $J$,
+pair-hopping $J'$ and nearest-neighbor repulsion $V$. These ground states lower
+their energy most effectively through $J$, hence we name them Class $J$ states.
+The competing effects of $V-J'$ on the direct and exchange energies determine
+the relative stability of Class $J$ states. We show that the spin-split and
+Rashba-like phases are the most favored ground states within Class $J$ because
+they have the minimum anisotropy in `polarized spin'. On a square lattice we
+find that the spin-split phase is always favored for near-empty bands; above a
+critical filling, we predict a transition from the paramagnetic to the
+Rashba-like phase at $ J_{c1}$ and a second transition to the spin-split state
+at $J_{c2}>J_{c1}$. An energetic comparison with ferromagnetism highlights the
+importance of the role of $V$ in the stability of Class $J$ states. We discuss
+the relevance of our results to (i) the $\alpha$ and $\beta$ phases proposed by
+Wu and Zhang in the Fermi Liquid formalism and (ii) experimental observations
+of spin-orbit splitting in \emph{Au}(111) surface states.",1009.2121v1
+2023-05-15,Extreme mass-ratio inspiral of a spinning body into a Kerr black hole I: Evolution along generic trajectories,"The study of spinning bodies moving in curved spacetime has relevance to
+binary black hole systems with large mass ratios, as well as being of formal
+interest. At zeroth order in a binary's mass ratio, the smaller body moves on a
+geodesic of the larger body's spacetime. Post-geodesic corrections describing
+forces driving the small body's worldline away from geodesics must be
+incorporated to model the system accurately. An important post-geodesic effect
+is the gravitational self-force, which describes the small body's interaction
+with its own spacetime curvature. This effect includes the backreaction due to
+gravitational-wave emission that leads to the inspiral of the small body into
+the black hole. When a spinning body orbits a black hole, its spin couples to
+spacetime curvature. This introduces another post-geodesic correction known as
+the spin-curvature force. An osculating geodesic integrator that includes both
+the backreaction due to gravitational waves and spin-curvature forces can be
+used to generate a spinning-body inspiral. In this paper, we use an osculating
+geodesic integrator to combine the leading backreaction of gravitational waves
+with the spin-curvature force. Our analysis only includes the leading
+orbit-averaged dissipative backreaction, and examines the spin-curvature force
+to leading order in the small body's spin. This is sufficient to build generic
+inspirals of spinning bodies, and serves as a foundation for further work
+examining how to include secondary spin in large-mass-ratio waveform models.",2305.08919v2
+2001-03-02,Orbital effect of Cooper pairs on Kondo effect in unconventional superconductors,"A new type of Kondo effect peculiar to unconventional superconductors is
+studied theoretically by using the Wilson's numerical renormalization group
+method. In this case, an angular momentum of a Cooper pair plays an important
+role in the Kondo effect. It produces multichannel exchange couplings with a
+local spin. Here we focus on a $p_x +i p_y$-wave state which is a full gap
+system. The calculated impurity susceptibility shows that the local spin is
+almost quenched by the Kondo effect in the strong coupling region ($T_{\rm
+K}/\Delta \to \infty$), while the ground state is always a spin doublet over
+all the $T_{\rm K}/\Delta$ region. Here $T_{\rm K}$ and $\Delta$ are the Kondo
+temperature and the superconducting energy gap, respectively. This is different
+from the s-wave pairing case where the Kondo singlet is realized for large
+$T_{\rm K}/\Delta$ values. The strong coupling analysis shows that the $p_x +i
+p_y$-wave Cooper pair is connected to the Kondo singlet via the orbital
+dynamics of the paired electrons, generating the spin of the ground state. This
+type of Kondo effect reflects the symmetry of the conduction electron system.",0103053v2
+2010-02-04,Quantized Anomalous Hall Effect in Magnetic Topological Insulators,"The Hall effect, the anomalous Hall effect and the spin Hall effect are
+fundamental transport processes in solids arising from the Lorentz force and
+the spin-orbit coupling respectively. The quantum versions of the Hall effect
+and the spin Hall effect have been discovered in recent years. However, the
+quantized anomalous Hall (QAH) effect has not yet been realized experimentally.
+In a QAH insulator, spontaneous magnetic moments and spin-orbit coupling
+combine to give rise to a topologically non-trivial electronic structure,
+leading to the quantized Hall effect without any external magnetic field. In
+this work, based on state-of-art first principles calculations, we predict that
+the tetradymite semiconductors Bi$_2$Te$_3$, Bi$_2$Se$_3$, and Sb$_2$Te$_3$
+form magnetically ordered insulators when doped with transition metal elements
+(Cr or Fe), in sharp contrast to conventional dilute magnetic semiconductor
+where free carriers are necessary to mediate the magnetic coupling. Magnetic
+order in two-dimensional thin films gives rise to a topological electronic
+structure characterized by a finite Chern number, with quantized Hall
+conductance $e^{2}/h$. Experimental realization of the long sought-after QAH
+insulator state could enable robust dissipationless charge transport at room
+temperature.",1002.0946v1
+2011-10-26,Dynamically generating arbitrary spin-orbit couplings for neutral atoms,"Spin-orbit coupling (SOC) can give rise to interesting physics, from spin
+Hall to topological insulators, normally in condensed matter systems. Recently,
+this topical area has extended into atomic quantum gases in searching for
+artificial/synthetic gauge potentials. The prospects of tunable interaction and
+quantum state control promote neutral atoms as nature's quantum emulators for
+SOC. Y.-J. Lin {\it et al.} recently demonstrated a special form of the SOC
+$k_x\sigma_y$: which they interpret as an equal superposition of Rashba and
+Dresselhaus couplings, in bose condensed atoms [Nature (London) \textbf{471},
+83 (2011)]. This work reports an idea capable of implementing arbitrary forms
+of SOC by switching between two pairs of Raman laser pulses like that used by
+Lin {\it et al.}. While one pair affects $k_x\sigma_y$ for some time, a second
+pair creates $k_y\sigma_y$ over other times with Raman pulses from different
+directions and a subsequent spin rotation into $\pm k_y\sigma_x$. With
+sufficient many pulses, the effective actions from different durations are
+small and accumulate in the same exponent despite that $k_x\sigma_y$ and $\pm
+k_y\sigma_x$ do not commute. Our scheme involves no added complication, and can
+be demonstrated within current experiments. It applies equally to bosonic or
+fermionic atoms.",1110.5705v2
+2018-11-22,Common nonlinear features and spin-orbit coupling effects in the Zeeman splitting of novel wurtzite materials,"The response of semiconductor materials to external magnetic fields is a
+reliable approach to probe intrinsic electronic and spin-dependent properties.
+In this study, we investigate the common Zeeman splitting features of novel
+wurtzite materials, namely InP, InAs, and GaAs. We present values for the
+effective g-factors of different energy bands and show that spin-orbit coupling
+effects, responsible for the spin splittings, also have noticeable
+contributions to the g-factors. Within the Landau level picture, we show that
+the nonlinear Zeeman splitting recently explained in magneto photoluminescence
+experiments for InP nanowires by Tedeschi et al. [Phys. Rev. B 99, 161204
+(2019)] are also present in InAs, GaAs and even in the conventional GaN. Such
+nonlinear features stem from the peculiar coupling of the A and B valence
+bands, as a consequence of the interplay between the wurtzite crystal symmetry
+and the breaking of time-reversal symmetry by the external magnetic field.
+Moreover, we develop an analytical model to describe the experimental nonlinear
+Zeeman splitting and apply it to InP and GaAs data. Extrapolating our fitted
+results, we found that the Zeeman splitting of InP reaches a maximum value,
+which is a prediction that could be probed at higher magnetic fields.",1811.09288v2
+2020-07-12,Anisotropic Kondo screening induced by spin-orbit coupling in quantum wires,"Using the numerical renormalization group (NRG) method we study a magnetic
+impurity coupled to a quantum wire with Rashba and Dresselhaus spin-orbit
+coupling (SOC) in an external magnetic field. We consider the low-filling
+regime with the Fermi energy close to the bottom of the band and report the
+results for local static and dynamic properties in the Kondo regime. In the
+absence of the field, local impurity properties remain isotropic in spin space
+despite the SOC-induced magnetic anisotropy of the conduction band. In the
+presence of the field, clear fingerprints of anisotropy are revealed through
+the strong field-direction dependence of the impurity spin polarization and
+spectra, in particular of the Kondo peak height. The detailed behavior depends
+on the relative magnitudes of the impurity and band $g$-factors. For the case
+of impurity $g$-factor somewhat lower than the band $g$-factor, the maximal
+Kondo peak suppression is found for field oriented along the effective SOC
+field axis, while for a field perpendicular to this direction we observe a
+compensation effect (``revival of the Kondo peak''): the SOC counteracts the
+Kondo peak splitting effects of the local Zeeman field. We demonstrate that the
+SOC-induced anisotropy, measurable by tunneling spectroscopy techniques, can
+help to determine the ratio of Rashba and Dresselhaus SOC strengths in the
+wire.",2007.06044v1
+2020-07-13,Spin-orbit coupled depairing of a dipolar biexciton superfluid,"We consider quantum phase transitions in a system of bright dipolar excitons
+which can form bound pairs (dipolar biexcitons). We assume a narrow resonance
+in the interaction of excitons with opposite spins. At sufficiently large
+density a resonant exciton superfluid transforms into a superfluid of
+biexcitons. The transition may be either of the first or the second kind. The
+average relative momenta of excitons in the pairs being beyond the light cone,
+the transition should be accompanied by reduction of the photoluminescence
+intensity. Effective magnetic fields due to the long-range exchange splitting
+of non-radiative exciton states induce broadening of the biexciton resonance.
+The fields shift the position of the gap in the elementary excitation spectrum
+to a circle of degenerate minima in the k-space. Closing the new gap defines a
+second order phase transition into a mixture of counter-propagating plane-wave
+excitonic condensates polarized linearly in the direction perpendicular to
+their wavevectors. In the resonance energy vs density phase diagram the novel
+phase intervenes between the dark biexciton and radiative exciton superfluids.
+We conclude that formation of a BCS-like biexciton condensate induces
+correlated alignment of the effective magnetic fields and excitonic spins. We
+outline important differences of the emergent mechanism from the phenomenon of
+spin-orbit (SO) coupled Bose-Einstein condensation. We expect existence of
+analogous mechanisms in SO-coupled fermionic superfluids and superconductors.",2007.06474v2
+2018-05-15,Thermal Hall effect and topological edge states in a square lattice antiferromagnet,"We show that the two dimensional spatial inversion-symmetry (SIS) broken
+square lattice antiferromagnet with easy-plane spin anisotropy exhibits a
+thermal Hall effect and the edge modes characterized by the Z 2 topological
+invariant. These topological properties require a nonzero Berry curvature, and
+its origin is ascribed to the Dzyaloshinskii-Moriya (DM) interactions or the
+noncoplanar magnetic ordering generating a U(1) gauge field that couples to the
+kinetic motion of magnons. Although this picture is established in ferromagnets
+on the kagome and pyrochlore lattices, it does not apply to our square lattice
+model since such gauge field cancels out in an edge shared geometry. Instead,
+our case has an analogy with the anomalous Hall effect of Rashba electronic
+system where the spin orbit coupling generates an SU(2) gauge field. The two
+species of magnons defined on antiferromagnetic sublattices can be regarded as
+the pseudo-spin degrees of freedom of magnons. The DM interactions that emerge
+due to the SIS breaking serve as a pseudo-spin orbit coupling of magnons and
+generate a Berry curvature, when the direction of the magnetic moments is
+properly controlled by the magnetic field. The thermal Hall conductivity of our
+antiferromagnet shows rapid growth in temperature T beyond the power-law,
+reflecting the almost gapless low energy branch of the antiferromagnet, which
+distinctively differs from the T^7/2 -dependence in the pyrochlore
+ferromagnets. The present system serves as a standard model for the
+noncentrosymmetric crystals Ba2MnGe2O7 and Ba2CoGe2O7.",1805.05872v3
+2020-01-16,Tailoring magnetic order via atomically stacking 3d/5d electrons,"The ability to tune magnetic orders, such as magnetic anisotropy and
+topological spin texture, is desired in order to achieve high-performance
+spintronic devices. A recent strategy has been to employ interfacial
+engineering techniques, such as the introduction of spin-correlated interfacial
+coupling, to tailor magnetic orders and achieve novel magnetic properties. We
+chose a unique polar-nonpolar LaMnO3/SrIrO3 superlattice because Mn (3d)/Ir
+(5d) oxides exhibit rich magnetic behaviors and strong spin-orbit coupling
+through the entanglement of their 3d and 5d electrons. Through magnetization
+and magnetotransport measurements, we found that the magnetic order is
+interface-dominated as the superlattice period is decreased. We were able to
+then effectively modify the magnetization, tilt of the ferromagnetic easy axis,
+and symmetry transition of the anisotropic magnetoresistance of the
+LaMnO3/SrIrO3 superlattice by introducing additional Mn (3d) and Ir (5d)
+interfaces. Further investigations using in-depth first-principles calculations
+and numerical simulations revealed that these magnetic behaviors could be
+understood by the 3d/5d electron correlation and Rashba spin-orbit coupling.
+The results reported here demonstrate a new route to synchronously engineer
+magnetic properties through the atomic stacking of different electrons,
+contributing to future applications.",2001.05821v2
+2021-06-30,Origin of Nonlinear Damping due to Mode Coupling in Auto-Oscillatory Modes Strongly Driven by Spin-Orbit Torque,"We investigate the physical origin of nonlinear damping due to mode coupling
+between several auto-oscillatory modes driven by spin-orbit torque in
+constricted Py/Pt heterostructures by examining the dependence of
+auto-oscillation on temperature and applied field orientation. We observe a
+transition in the nonlinear damping of the auto-oscillation modes extracted
+from the total oscillation power as a function of drive current, which
+coincides with the onset of power redistribution amongst several modes and the
+crossover from linewidth narrowing to linewidth broadening in all individual
+modes. This indicates the activation of another relaxation process by nonlinear
+magnon-magnon scattering within the modes. We also find that both nonlinear
+damping and threshold current in the mode-interaction damping regime at high
+drive current after transition are temperature independent, suggesting that the
+mode coupling occurs dominantly through a non-thermal magnon scattering process
+via a dipole or exchange interaction rather than thermally excited
+magnon-mediated scattering. This finding presents a promising pathway to
+overcome the current limitations of efficiently controlling the interaction
+between two highly nonlinear magnetic oscillators to prevent mode crosstalk or
+inter-mode energy transfer and deepens understanding of complex nonlinear spin
+dynamics in multimode spin wave systems.",2107.00150v2
+2021-12-09,Polarization-dependent magnetic properties of periodically driven $α$-RuCl$_{3}$,"We study magnetic properties of a periodically driven Mott insulator with
+strong spin-orbit coupling and show some properties characteristic of linearly
+polarized light. We consider a $t_{2g}$-orbital Hubbard model driven by
+circularly or linearly polarized light with strong spin-orbit coupling and
+derive its effective Hamiltonian in the strong-interaction limit for a
+high-frequency case. We show that linearly polarized light can change not only
+the magnitudes and signs of the exchange interactions, but also their bond
+anisotropy even without the bond-anisotropic hopping integrals. Because of this
+property, the honeycomb-network spin system could be transformed into weakly
+coupled zigzag or step spin chains for the light field polarized along the $b$-
+or $a$-axis, respectively. Then, analyzing how the light fields affect several
+magnetic states in a mean-field approximation, we show that linearly polarized
+light can change the relative stability of the competing magnetic states,
+whereas such a change is absent for circularly polarized light. We also analyze
+the effects of both the bond anisotropy of nearest-neighbor hopping integrals
+and a third-neighbor hopping integral on the magnetic states and show that the
+results obtained in a simple model, in which the bond-averaged nearest-neighbor
+hopping integrals are considered, remain qualitatively unchanged except for the
+stability of zigzag states in the non-driven case and the degeneracy lifting of
+the zigzag or stripy states.",2112.04690v1
+2022-04-06,Leading superconducting instabilities in three-dimensional models for Sr2RuO4,"The superconductor Sr2RuO4 has been the subject of enormous interest over
+more than two decades, but until now the form of its order parameter has not
+been determined. Since groundbreaking NMR experiments revealed that the pairs
+are of dominant spin-singlet character, attention has focused on time-reversal
+symmetry breaking linear combinations of $s$-, $d$- and $g$-wave
+one-dimensional (1D) irreducible representations. However, a state of the form
+$d_{xz}+id_{yz}$ has also been proposed. We present a systematic study of the
+stability of various superconducting candidate states, assuming that pairing is
+driven by the fluctuation exchange mechanism, including a realistic
+three-dimensional Fermi surface, full treatment of both local and non-local
+spin-orbit couplings, and a wide range of interaction parameters $U,J,U',J'$.
+The leading superconducting instabilities are found to exhibit nodal
+even-parity $A_{1g} (s')$ or $B_{1g} (d_{x^2-y^2})$ symmetries, similar to the
+findings in two-dimensional models without longer-range Coulomb interaction
+which tends to favor $d_{xy}$ over $d_{x^2-y^2}$. Within the so-called Hund's
+coupling mean-field pairing scenario, the $E_g (d_{xz}/d_{yz})$ solution can be
+stabilized for large $J$ and specific forms of the spin-orbit coupling, but for
+all cases studied here the eigenvalues of other superconducting solutions are
+significantly larger when the full fluctuation exchange vertex is included in
+the pairing kernel. Additionally, we compute the spin susceptibility in
+relevant superconducting candidate phases and compare to recent neutron
+scattering and NMR Knight shift measurements.",2204.02880v1
+2023-10-26,Multiband $k \cdot p$ theory for hexagonal germanium,"The direct bandgap found in hexagonal germanium and some of its alloys with
+silicon allows for an optically active material within the group-IV
+semiconductor family with various potential technological applications.
+However, there remain some unanswered questions regarding several aspects of
+the band structiure, including the strength of the electric dipole transitions
+at the center of the Brillouin zone. Using the $\mathbf{k\cdot p}$ method near
+the $\Gamma$ point, including 10 bands, and taking spin-orbit coupling into
+account, we obtain a self-consistent model that produces the correct band
+curvatures, with previously unknown inverse effective mass parameters, to
+describe 2H-Ge via fitting to {\it ab initio} data and to calculate effective
+masses for electrons and holes. To understand the weak dipole coupling between
+the lowest conduction band and the top valance band, we start from a spinless
+12-band model and show that when adding spin-orbit coupling, the lowest
+conduction band hybridizes with a higher-lying conduction band, which cannot be
+explained by the spinful 10-band model. With the help of L\""owdin's
+partitioning, we derive the effective low-energy Hamiltonian for the conduction
+bands for the possible spin dynamics and nanostructure studies and in a similar
+manner, we give the best fit parameters for the valance-band-only model that
+can be used in the transport studies. Finally, using the self-consistent
+10-band model, we include the effects of a magnetic field and predict the
+electron and hole g-factor of the conduction and valance bands.",2310.17366v1
+2023-12-01,Large enhancement of spin-orbit torques under a MHz modulation due to phonon-magnon coupling,"The discovery of spin-orbit torques (SOTs) generated through the spin Hall or
+Rashba effects provides an alternative write approach for magnetic
+random-access memory (MRAM), igniting the development of spin-orbitronics in
+recent years. Quantitative characterization of SOTs highly relies on the
+SOT-driven ferromagnetic resonance (ST-FMR), where a modulated microwave
+current is used to generate ac SOTs and the modulation-frequency is usually
+less than 100 kHz (the limit of conventional lock-in amplifiers). Here we have
+investigated the SOT of typical SOT material/ferromagnet bilayers in an
+extended modulation-frequency range, up to MHz, by developing the ST-FMR
+measurement. Remarkably, we found that the measured SOTs are enhanced about
+three times in the MHz range, which cannot be explained according to present
+SOT theory. We attribute the enhancement of SOT to additional magnon
+excitations due to phonon-magnon coupling, which is also reflected in the
+slight changes of resonant field and linewidth in the acquired ST-FMR spectra,
+corresponding to the modifications of effective magnetization and damping
+constant, respectively. Our results indicate that the write current of SOT-MRAM
+may be reduced with the assistant of phonon-magnon coupling.",2401.02967v1
+2007-10-31,Localization problem of the quasiperiodic system with the spin orbit interaction,"We study one dimensional quasiperiodic system obtained from the tight-binding
+model on the square lattice in a uniform magnetic field with the spin orbit
+interaction. The phase diagram with respect to the Harper coupling and the
+Rashba coupling are proposed from a number of numerical studies including a
+multifractal analysis. There are four phases, I, II, III, and IV in this order
+from weak to strong Harper coupling. In the weak coupling phase I all the wave
+functions are extended, in the intermediate coupling phases II and III mobility
+edges exist, and accordingly both localized and extended wave functions exist,
+and in the strong Harper coupling phase IV all the wave functions are
+localized. Phase I and Phase IV are related by the duality, and phases II and
+III are related by the duality, as well. A localized wave function is related
+to an extended wave function by the duality, and vice versa. The boundary
+between phases II and III is the self-dual line on which all the wave functions
+are critical. In the present model the duality does not lead to pure spectra in
+contrast to the case of Harper equation.",0710.5816v2
+2019-07-17,Symmetry breaking of a matter-wave soliton in a double-well potential formed by spatially confined spin-orbit coupling,"We consider the symmetry breaking of a matter-wave soliton formed by spinor
+Bose-Einstein condensates (BECs) illuminated by a two-spot laser beam. This
+laser beam introduces spin-orbit (SO) coupling in the BECs such that the SO
+coupling produces an effect similar to a linear doublewell potential (DWP). It
+is well known that symmetry breaking in a DWP is an important effect and has
+been discussed in many kinds of systems. However, it has not yet been discussed
+in a DWP formed by SO coupling. The objective of this work is to study the
+symmetry breaking of spinor BECs trapped by a DWP formed by SO coupling. We
+find that two kinds of symmetry breaking, displacement symmetry breaking and
+bimodal symmetry breaking, can be obtained in this model. The influence of the
+symmetry transition is systematically discussed by controlling the interaction
+strength of the BECs and the distance between the center of the two spots.
+Moreover, because SO coupling violates Galilean invariance, the influence of
+symmetry breaking in the moving system is also addressed in this paper.",1907.07416v1
+2020-01-13,Improved effective equation for the Rashba spin-orbit coupling in semiconductor nanowires,"Semiconductor Rashba nanowires are quasi-one dimensional systems that have
+large spin-orbit (SO) coupling arising from a broken inversion symmetry due to
+an external electric field. There exist parametrized multiband models that can
+describe accurately this effect. However, simplified single band models are
+highly desirable to study geometries of recent experimental interest, since
+they may allow to incorporate the effects of the low dimensionality and the
+nanowire electrostatic environment at a reduced computational cost. Commonly
+used conduction band approximations, valid for bulk materials, greatly
+underestimate the SO coupling in Zinc-blende crystal structures and
+overestimate it for Wurtzite ones when applied to finite cross-section wires,
+where confinement effects turn out to play an important role. We demonstrate
+here that an effective equation for the linear Rashba SO coupling of the
+semiconductor conduction band can reproduce the behavior of more sophisticated
+eight-band k$\cdot$p model calculations. This is achieved by adjusting a single
+effective parameter that depends on the nanowire crystal structure and its
+chemical composition. We further compare our results to the Rashba coupling
+extracted from magnetoconductance measurements in several experiments on InAs
+and InSb nanowires, finding excellent agreement. This approach may be relevant
+in systems where Rashba coupling is known to play a major role, such as in
+spintronic devices or Majorana nanowires.",2001.04375v3
+2018-06-04,Electric field tunable superconductor-semiconductor coupling in Majorana nanowires,"We study the effect of external electric fields on
+superconductor-semiconductor coupling by measuring the electron transport in
+InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor.
+We find that the gate voltage induced electric fields can greatly modify the
+coupling strength, which has consequences for the proximity induced
+superconducting gap, effective g-factor, and spin-orbit coupling, which all
+play a key role in understanding Majorana physics. We further show that level
+repulsion due to spin-orbit coupling in a finite size system can lead to
+seemingly stable zero bias conductance peaks, which mimic the behavior of
+Majorana zero modes. Our results improve the understanding of realistic
+Majorana nanowire systems.",1806.00988v1
+2021-06-28,Creating tunable and coupled Rashba-type quantum dots atom-by-atom,"Artificial lattices created by assembling atoms on a surface with scanning
+tunneling microscopy present a platform to create matter with tailored
+electronic, magnetic and topological properties. However, such artificial
+lattices studies to date have focused exclusively on surfaces with weak
+spin-orbit coupling. Here, we created artificial and coupled quantum dots by
+fabricating quantum corrals from iron atoms on the prototypical Rashba surface
+alloy, BiCu2, using low-temperature scanning tunneling microscopy. We
+quantified the quantum confinement of such quantum dots with various diameter
+and related this to the spatially dependent density of states, using scanning
+tunneling spectroscopy. We found that the density of states shows complex
+distributions beyond the typical isotropic patterns seen in radially symmetric
+structures on (111) noble metal surfaces. We related these to the
+energy-dependent interplay of the confinement potential with the hexagonal
+warping and multiple intra- and interband scattering vectors, which we
+simulated with a particle-in-a-box model that considers the Rashba-type band
+structure of BiCu2. Based on these results, we studied the effect of coupling
+two quantum dots and exploited the resultant anisotropic coupling derived from
+the symmetry of the various scattering channels. The large anisotropy and
+spin-orbit coupling provided by the BiCu2 platform are two key ingredients
+toward creation of correlated artificial lattices with non-trivial topology.",2106.14561v1
+2022-10-11,Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate,"SrTiO3 is known for its proximity to a ferroelectric phase and for showing an
+'optimal' doping for superconductivity with a characteristic dome-like
+behaviour resembling systems close to a quantum critical point. Several
+mechanisms have been proposed to link these phenomena, but the abundance of
+undetermined parameters prevents a definite assessment. Here, we use ab initio
+computations supplemented with a microscopic model to study the linear coupling
+between conduction electrons and the ferroelectric soft transverse modes
+allowed in the presence of spin-orbit coupling. We find a robust Rashba-like
+coupling, which can become surprisingly strong for particular forms of the
+polar eigenvector. We characterize this sensitivity for general eigenvectors
+and, for the particular form deduced by hyper-Raman scattering experiments, we
+find a BCS pairing coupling constant of the right order of magnitude to support
+superconductivity. The ab initio computations enable us to go beyond the
+linear-in-momentum conventional Rashba-like interaction and naturally explain
+the dome behaviour including a characteristic asymmetry. The dome is attributed
+to a momentum dependent quenching of the angular momentum due to a competition
+between spin-orbit and hopping energies. The optimum density for having maximum
+Tc results in rather good agreement with experiments without free parameters.
+These results make the generalized Rashba dynamic coupling to the ferroelectric
+soft mode a compelling pairing mechanism to understand bulk superconductivity
+in doped SrTiO3.",2210.05753v2
+2023-10-10,Rashba-Dresselhaus spin-orbit coupling and polarization-coupled luminescence in an organic single crystal microcavity,"Spin-orbit coupling (SOC) of light plays a fundamental photophysics that is
+important for various fields such as materials science, optics, and quantum
+technology, contributing to the elucidation of new physical phenomena and the
+development of innovative applications. In this study, we investigate the
+impact of SOC in a microcavity system using the highly oriented molecular
+crystal. The unique molecular alignment of our crystal creates substantial
+optical anisotropy, enabling the observation of significant SOC effects within
+a microcavity form. Through angle-resolved photoluminescence measurements and
+theoretical calculations, the presence of Rashba-Dresselhaus (RD) SOC in the
+lower branch of polariton modes is revealed. We have observed for the first
+time polarization-coupled emission from polariton modes due to the RD-SOC
+effect in a microcavity with a medium having both strong light-matter coupling
+and strong optical anisotropy. Theoretical investigations further elucidate the
+intricate interplay between the RD-SOC effect and anisotropic light-matter
+coupling, leading to the emergence of both circularly and diagonally polarized
+mode splittings. This study not only advances our understanding of optical SOC
+in microcavities but also highlights the potential of highly oriented molecular
+crystals in manipulating SOC effects without external electric or magnetic
+fields. These findings offer greatly promising platforms for developing
+topological photonics and quantum technologies.",2310.06465v1
+2019-09-26,"Perdeuteration of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (d-MEHPPV): control of microscopic charge-carrier spin-spin coupling and of magnetic-field effects in optoelectronic devices","Control of the effective local hyperfine fields in a conjugated polymer,
+poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (MEHPPV), by
+isotopic engineering is reported. These fields, evident as a
+frequency-independent line broadening mechanism in electrically detected
+magnetic resonance spectroscopy (EDMR), originate from the unresolved hyperfine
+coupling between the electronic spin of charge carrier pairs and the nuclear
+spins of surrounding hydrogen isotopes. The room temperature study of effects
+caused by complete deuteration of this polymer through magnetoresistance,
+magnetoelectroluminescence, coherent pulsed and multi-frequency EDMR, as well
+as inverse spin-Hall effect measurements, confirm the weak hyperfine broadening
+of charge carrier magnetic resonance lines. As a consequence, we can resolve
+coherent charge-carrier spin-beating, allowing for direct measurements of the
+magnitude of electronic spin-spin interactions. In addition, the weak hyperfine
+coupling allows us to resolve substantial spin-orbit coupling effects in EDMR
+spectra, even at low magnetic field strengths. These results illustrate the
+dramatic influence of hyperfine fields on the spin physics of organic
+light-emitting diode (OLED) materials at room temperature, and point to routes
+to reaching exotic ultra-strong resonant-drive regimes needed for the study of
+light-matter interactions.",1909.12213v1
+2018-02-25,Interplay of spin-dependent delocalization and magnetic anisotropy in the ground and excited states of [Gd$_2$@C$_{78}$]$^{-1}$ and [Gd$_2$@C$_{80}$]$^{-1}$,"The magnetic properties and electronic structure of the ground and excited
+states of two recently characterized endohedral metallo-fullerenes,
+[Gd$_2$@C$_{78}$]$^{-}$ (1) and [Gd$_2$@C$_{80}$]$^{-}$ (2), have been studied
+by theoretical methods. The systems can be considered as [Gd$_2$]$^{5+}$ dimers
+encapsulated in a fullerene cage with the fifteen unpaired electrons
+ferromagnetically coupled into an $S=15/2$ high-spin configuration in the
+ground state. The microscopic mechanisms governing the Gd--Gd interactions
+leading to the ferromagnetic ground state are examined by a combination of
+density functional and ab initio calculations and the full energy spectrum of
+the ground and lowest excited states is constructed by means of ab initio model
+Hamiltonians. The ground state is characterized by strong electron
+delocalization bordering on a $\sigma$ type one-electron covalent bond and
+minor zero-field splitting (ZFS) which is successfully described as a second
+order spin-orbit coupling effect. We have shown that the observed ferromagnetic
+interaction originates from Hund's rule coupling and not from the conventional
+double exchange mechanism. The calculated ZFS parameters of 1 and 2 in their
+optimized geometries are in qualitative agreement with experimental EPR
+results. The higher excited states display less electron delocalization but at
+the same time they possess unquenched first-order angular momentum. This leads
+to strong spin-orbit coupling and highly anisotropic energy spectrum. The
+analysis of the excited states presented here constitutes the first detailed
+study of the effects of spin-dependent delocalization in the presence of first
+order orbital angular momentum and the obtained results can be applied to other
+mixed valence lanthanide systems.",1802.09068v1
+2017-07-12,Superconductivity in three-dimensional spin-orbit coupled semimetals,"Motivated by the experimental detection of superconductivity in the
+low-carrier density half-Heusler compound YPtBi, we study the pairing
+instabilities of three-dimensional strongly spin-orbit coupled semimetals with
+a quadratic band touching point. In these semimetals the electronic structure
+at the Fermi energy is described by spin j=3/2 quasiparticles, which are
+fundamentally different from those in ordinary metals with spin j=1/2. We
+develop a general approach to analyzing pairing instabilities in j=3/2
+materials by decomposing the pair scattering interaction into irreducible
+channels, projecting them to the Fermi surface and deriving the corresponding
+Eliashberg theory. Applying our method to a generic density-density interaction
+in YPtBi we establish the following results: (i) The pairing strength in each
+channel uniquely encodes the j=3/2 nature of the Fermi surface band
+structure--a manifestation of the fundamental difference with ordinary metals.
+In particular, this implies that Anderson's theorem, which addresses the effect
+of spin-orbit coupling and disorder on pairing states of spin-1/2 electrons,
+cannot be applied in this case. (ii) The leading pairing instabilities are
+different for electron and hole doping. This implies that superconductivity
+depends on carrier type. (iii) In the case of hole doping--relevant to YPtBi,
+we find two odd-parity channels in close competition with s-wave pairing. One
+of these two channels is a multicomponent pairing channel, allowing for the
+possibility of time-reversal symmetry breaking. (iv) In the case of Coulomb
+interactions mediated by the long-ranged electric polarization of optical
+phonon modes, a significant coupling strength is generated in spite of the
+extremely low density of carriers. Furthermore, non-linear response and Fermi
+liquid corrections can favor non-s-wave pairing and potentially account for the
+experimentally-observed Tc.",1707.03831v2
+2020-07-01,One-dimensional spin-orbit coupled Dirac system with extended $s$-wave superconductivity: Majorana modes and Josephson effects,"Motivated by the spin-momentum locking of electrons at the boundaries of
+topological insulators, we study a one-dimensional system of spin-orbit coupled
+massless Dirac electrons with $s$-wave superconducting pairing. As a result of
+the spin-orbit coupling, our model has only two kinds of linearly dispersing
+modes, which we take to be right-moving spin-up and left-moving spin-down. Both
+lattice and continuum models are studied. In the lattice model, we find that a
+single Majorana zero energy mode appears at each end of a finite system
+provided that the $s$-wave pairing has an extended form, with the
+nearest-neighbor pairing being larger than the on-site pairing. We confirm this
+both numerically and analytically by calculating the winding number. Next we
+study a lattice version of a model with both Schr\""odinger and Dirac-like terms
+and find that the model hosts a topological transition between topologically
+trivial and non-trivial phases depending on the relative strength of the
+Schr\""odinger and Dirac terms. We then study a continuum system consisting of
+two $s$-wave superconductors with different phases of the pairing. Remarkably,
+we find that the system has a {\it single} Andreev bound state which is
+localized at the junction. When the pairing phase difference crosses a multiple
+of $2 \pi$, an Andreev bound state touches the top of the superconducting gap
+and disappears, and a different state appears from the bottom of the gap. We
+also study the AC Josephson effect in such a junction with a voltage bias that
+has both a constant $V_0$ and a term which oscillates with a frequency
+$\omega$. We find that, in contrast to standard Josephson junctions, Shapiro
+plateaus appear when the Josephson frequency $\omega_J= 2eV_0/\hbar$ is a
+rational fraction of $\omega$. We discuss experiments which can realize such
+junctions.",2007.00357v2
+2023-07-20,Observation of long-range ferromagnetism via anomalous supercurrents in a spin-orbit coupled superconductor,"Conventional superconductors naturally disfavor ferromagnetism because the
+supercurrent-carrying electrons are paired into anti-parallel spin singlets. In
+superconductors with strong Rashba spin-orbit coupling, impurity magnetic
+moments induce supercurrents through the spin-galvanic effect. As a result,
+long-range ferromagnetic interaction among the impurity moments may be mediated
+through such anomalous supercurrents in a similar fashion as in itinerant
+ferromagnets. Fe(Se,Te) is such a superconductor with topological surface
+bands, previously shown to exhibit quantum anomalous vortices around impurity
+spins. Here, we take advantage of the flux sensitivity of scanning
+superconducting quantum interference devices to investigate superconducting
+Fe(Se,Te) in the regime where supercurrents around impurities overlap. We find
+homogeneous remanent flux patterns after applying a supercurrent through the
+sample. The patterns are consistent with anomalous edge and bulk supercurrents
+generated by in-plane magnetization, which occur above a current threshold and
+follow hysteresis loops reminiscent of those of a ferromagnet. Similar
+long-range magnetic orders can be generated by Meissner current under a small
+out-of-plane magnetic field. The magnetization weakens with increasing
+temperature and disappears after thermal cycling to above superconducting
+critical temperature; further suggesting superconductivity is central to
+establishing and maintaining the magnetic order. These observations demonstrate
+surface anomalous supercurrents as a mediator for ferromagnetism in a
+spin-orbit coupled superconductor, which may potentially be utilized for
+low-power cryogenic memory.",2307.10722v2
+2004-06-08,Spin injection and detection by resonant tunneling structure,"A theory of spin-dependent electron transmission through resonant tunneling
+diode (RTD) grown of non-centrosymmetrical semiconductor compounds has been
+presented. It has been shown that RTD can be employed for injection and
+detection of spin-polarized carriers: (i) electric current flow in the
+interface plane leads to spin polarization of the transmitted carriers, (ii)
+transmission of the spin-polarized carriers through the RTD is accompanied by
+generation of an in-plane electric current. The microscopic origin of the
+effects is the spin-orbit coupling-induced splitting of the resonant level.",0406191v1
+2004-12-07,Spin Hall effect in a Doped Mott Insulator,"The existence of conserved spin Hall currents is shown in a strongly
+correlated system without involving spin-orbit coupling. The spin Hall
+conductivity is determined by intrinsic bulk properties, which remains finite
+even when the charge resistivity diverges in strong magnetic fields at zero
+temperature. The state in the latter limit corresponds to a spin Hall
+insulator. Such a system is a doped Mott insulator described by the phase
+string theory, and spin Hall effect is predicted to coexist with the Nernst
+effect to characterize the intrinsic properties of the low-temperature
+pseudogap phase. Possible applications in spintronics are also mentioned.",0412146v2
+2004-12-22,Can Non-Equilibrium Spin Hall Accumulation be Induced in Ballistic Nanostructures?,"We demonstrate that flow of longitudinal unpolarized current through a
+ballistic two-dimensional electron gas with Rashba spin-orbit coupling will
+induce nonequilibrium spin accumulation which has opposite sign for the two
+lateral edges and it is, therefore, the principal observable signature of the
+spin Hall effect in two-probe semiconductor nanostructures. The magnitude of
+its out-of-plane component is gradually diminished by static disorder, while it
+can be enhanced by an in-plane transverse magnetic field. Moreover, our
+prediction of the longitudinal component of the spin Hall accumulation, which
+is insensitive to the reversal of the bias voltage, offers a smoking gun to
+differentiate experimentally between the extrinsic, intrinsic, and mesoscopic
+spin Hall mechanisms.",0412595v3
+2005-03-15,Disorder effects on the spin-Hall current in a diffusive Rashba two-dimensional heavy-hole system,"We investigate the spin-Hall effect in a two-dimensional heavy-hole system
+with Rashba spin-orbit coupling using a nonequilibrium Green's function
+approach. Both the short- and long-range disorder scatterings are considered in
+the self-consistent Born approximation. We find that, in the case of long-range
+collisions, the disorder-mediated process leads to an enhancement of the
+spin-Hall current at high heavy-hole density, whereas for short-range
+scatterings it gives a vanishing contribution. This result suggests that the
+recently observed spin-Hall effect in experiment is a result of the sum of the
+intrinsic and disorder-mediated contributions. We have also calculated the
+temperature dependence of spin-Hall conductivity, which reveals a decrease with
+increasing the temperature.",0503352v4
+2006-02-10,Spin Hall Conductance of the Two Dimensional Hole Gas in a Perpendicular Magnetic Field,"The charge and spin Hall conductance of the two-dimensional hole gas within
+the Luttinger model with and without inversion symmetry breaking terms in a
+perpendicular magnetic field are studied, and two key phenomena are predicted.
+The sign of the spin Hall conductance is modulated periodically by the external
+magnetic field, which means a possible application in the future. Furthermore,
+a resonant spin Hall conductance in the two-dimensional hole gas with a certain
+hole density at a typical magnetic field is indicated, which implies a likely
+way to firmly establish the intrinsic spin Hall effect. The charge Hall
+conductance is unaffected by the spin-orbit coupling.",0602258v3
+2006-11-30,Quantized spin Hall effect in Helium three-A and other p-wave paired Fermi systems,"In this paper we propose the quantized spin Hall effect (SHE) in the vortex
+state of a rotating p-wave paired Fermi system in an inhomogeneous magnetic
+field and in a weak periodic potential. It is the three dimensional extension
+of the spin Hall effect for a 3He-A superfluid film studied in Ref. [1]. It may
+also be considered as a generalization of the 3D quantized charge Hall effect
+of Bloch electrons in Ref. [2] to the spin transport. The A-phase of 3He or,
+more generally, the p-wave paired phase of a cold Fermi atomic gas, under
+suitable conditions should be a good candidate to observe the SHE, because the
+system has a conserved spin current (with no spin-orbit couplings).",0612005v4
+2007-01-05,Spin Hall utilizing U(1) and SU(2) gauge fields,"We propose a two-dimensional electron gas (2DEG) system in which an external
+magnetic (B) field with a small chirality is applied to provide a topological
+U(1) U(1) gauge field that separates conduction electrons of opposite spins in
+the transverse direction. Additionally, the vertical electric (E) field in the
+2DEG, together with spin-orbit coupling, produces a SU(2) gauge field which
+reinforces / opposes the effect of the topological gauge. The system thus
+provides a tunable spin Hall effect, where an applied gate voltage on the 2DEG
+can be used to modulate the transverse spin current. As this method leads to
+the enhancement or cancellation of intrinsic spin Hall, it naturally
+distinguishes the extrinsic from the intrinsic effect.",0701111v3
+2007-02-06,Spin Triplet Superconducting State due to Broken Inversion Symmetry in Li_2Pt_3B,"We report ^{11}B and ^{195}Pt NMR measurements in non-centrosymmetric
+superconductor Li_2Pt_3B. We find that the spin susceptibility measured by the
+Knight shift remains unchanged across the superconducting transition
+temperature T_c. With decreasing temperature (T) below T_c, the spin-lattice
+relaxation rate 1/T_1 decreases with no coherence peak and is in proportion to
+T^3. These results indicate that the Cooper pair is in the spin-triplet state
+and that there exist line nodes in the superconducting gap function. They are
+in sharp contrast with those in the isostructural Li_2Pd_3B which is a
+spin-singlet, s-wave superconductor, and are ascribed to the enhanced
+spin-orbit coupling due to the lack of spatial inversion symmetry. Our finding
+points to a new paradigm where exotic superconductivity arises in the absence
+of strong electron-electron correlations.",0702130v1
+2007-07-19,Graphene based spin field effect transistor,"A spin field effect transistor (FET) is proposed by utilizing a graphene
+nanoribbon as the channel. Similar to the conventional spin FETs, the device
+involves ferromagnetic metals as a source and drain; they, in turn, are
+connected to the graphene channel. Due to the negligible spin-orbital coupling
+in the carbon based materials, the bias can accomplishes spin manipulation by
+means of electrical control of electron exchange interaction with a
+ferromagnetic dielectric attached to the nanoribbon between source and drain.
+The numerical estimations show the feasibility of graphene-based spin FET if a
+bias varies exchange interaction on the amount around 5 meV. It was shown that
+the device stability to the thermal dispersion can provide the armchair
+nanoribbons of specific width that keeps the Dirac point in electron dispersion
+law.",0707.2966v1
+2007-10-21,Geometric phases in semiconductor spin qubits: Manipulations and decoherence,"We describe the effect of geometric phases induced by either classical or
+quantum electric fields acting on single electron spins in quantum dots in the
+presence of spin-orbit coupling. On one hand, applied electric fields can be
+used to control the geometric phases, which allows performing quantum coherent
+spin manipulations without using high-frequency magnetic fields. On the other
+hand, fluctuating fields induce random geometric phases that lead to spin
+relaxation and dephasing, thus limiting the use of such spins as qubits. We
+estimate the decay rates due to piezoelectric phonons and conduction electrons
+in the circuit, both representing dominant electric noise sources with
+characteristically differing power spectra.",0710.3931v2
+2008-08-21,Theory of Electron Spin Relaxation in ZnO,"Doped ZnO is a promising material for spintronics applications. For such
+applications, it is important to understand the spin dynamics and particularly
+the spin coherence of this II-VI semiconductor. The spin lifetime $\tau_{s}$
+has been measured by optical orientation experiments, and it shows a surprising
+non-monotonic behavior with temperature. We explain this behavior by invoking
+spin exchange between localized and extended states. Interestingly, the effects
+of spin-orbit coupling are by no means negligible, in spite of the relatively
+small valence band splitting. This is due to the wurtzite crystal structure of
+ZnO. Detailed analysis allows us to characterize the impurity binding energies
+and densities, showing that optical orientation experiments can be used as a
+characterization tool for semiconductor samples.",0808.2913v3
+2011-09-28,Spin Transport Properties of Fractal and Non-Fractal Thinfilm,"Spatial behavior of spin transport in a Sierpinski gasket fractal is studied
+from two dimensions to quasi-one dimension subject to the Rashba spin-orbital
+coupling. With two normal metal leads represented by self-energy matrix,
+discretizing the derived continuous Hamiltonian to a tight-binding version,
+Landauer-Keldysh formalism for nonequilibrium transport can be applied. It was
+observed that the spin Hall effect presents in the distribution of spin density
+critically depends on the fractal structure and the shape of the thinfilm. The
+local spin density and transmission are numerically tested by the present
+quantum transport calculation for the fractal and non-fractal thinfilm varying
+from two-dimensional square-lattice into quasi-one dimensional fractal shape
+(Sierpinski triangles).",1109.6120v1
+2012-02-29,Spin-transfer torque and spin-polarization in topological-insulator/ferromagnet vertical heterostructures,"We predict an unconventional spin-transfer torque (STT) acting on the
+magnetization of a free ferromagnetic (F) layer within N/TI/F vertical
+heterostructures which originates from strong spin-orbit coupling (SOC) on the
+surface of a three-dimensional topological insulator (TI), as well as from
+charge current becoming spin-polarized in the direction of transport as it
+flows from the normal metal (N) across the bulk of the TI slab. Unlike
+conventional STT in symmetric F'/I/F magnetic tunnel junctions, where only the
+in-plane STT component is non-zero in the linear response, both the in-plane
+and perpendicular torque are sizable in N/TI/F junctions while not requiring
+fixed F' layer as spin-polarizer which is advantageous for spintronic
+applications. Using the nonequilibrium Born-Oppenheimer treatment of
+interaction between fast conduction electrons and slow magnetization, we derive
+a general Keldysh Green function-based STT formula which makes it possible to
+analyze torque in the presence of SOC either in the bulk or at the interface of
+the free F layer.",1202.6602v1
+2012-11-01,Spin-polarized Majorana Bound States inside a Vortex Core in Topological Superconductors,"We reveal that Majorana bound states inside the vortex core in an odd-parity
+topological superconductivity classified as ""pseudo-scalar"" type in the gap
+function are distinctly spin-polarized by solving the massive Dirac
+Bogoliubov-de Gennes (BdG) equation considering the spin-orbit coupling. This
+result is universal for ""Dirac superconductivity"" whose rotational degree of
+freedom is characterized by the total angular momentum J = S + L and in marked
+contrast to the spin-degeneracy of the core bound states as the consequence of
+the conventional BdG equation. The spin-polarized vortex core can be easily
+detected by spin-sensitive probes such as the neutron scattering and other
+measurements well above the first critical magnetic field H_{c1}.",1211.0125v2
+2012-11-02,Dynamic Spin Injection into Chemical Vapor Deposited Graphene,"We demonstrate dynamic spin injection into chemical vapor deposition (CVD)
+grown graphene by spin pumping from permalloy (Py) layers. Ferromagnetic
+resonance measurements at room temperature reveal a strong enhancement of the
+Gilbert damping at the Py/graphene interface, exceeding that observed in even
+Py/platinum interfaces. Similar results are also shown on Co/graphene layers.
+This enhancement in the Gilbert damping is understood as the consequence of
+spin pumping at the interface driven by magnetization dynamics. Our
+observations suggest a strong enhancement of spin-orbit coupling in CVD
+graphene, in agreement with earlier spin valve measurements.",1211.0492v1
+2013-02-05,Spin-valley lifetimes in a silicon quantum dot with tunable valley splitting,"Although silicon is a promising material for quantum computation, the
+degeneracy of the conduction band minima (valleys) must be lifted with a
+splitting sufficient to ensure formation of well-defined and long-lived spin
+qubits. Here we demonstrate that valley separation can be accurately tuned via
+electrostatic gate control in a metal-oxide-semiconductor quantum dot,
+providing splittings spanning 0.3 - 0.8 meV. The splitting varies linearly with
+applied electric field, with a ratio in agreement with atomistic tight-binding
+predictions. We demonstrate single-shot spin readout and measure the spin
+relaxation for different valley configurations and dot occupancies, finding
+one-electron lifetimes exceeding 2 seconds. Spin relaxation occurs via phonon
+emission due to spin-orbit coupling between the valley states, a process not
+previously anticipated for silicon quantum dots. An analytical theory describes
+the magnetic field dependence of the relaxation rate, including the presence of
+a dramatic rate enhancement (or hot-spot) when Zeeman and valley splittings
+coincide.",1302.0983v2
+2013-03-01,Spontaneous and resonant lifting of the spin blockade in nanowire quantum dots,"A complete numerical description of the charge and spin dynamics of a
+two-electron system confined in narrow nanowire quantum dots under oscillating
+electric field is presented in the context of recent electric dipole spin
+resonance experiments. We find that the spin-orbit coupling results in lifting
+the spin blockade by phonon mediated relaxation provided that the initially
+occupied state is close in energy to the ground state. This leads to
+suppression of the blockade from the triplet state with spins polarized
+parallel to the external magnetic field B. At higher B, after singlet-triplet
+ground-state transition a new channel for lifting the Pauli blockade opens
+which results in an appearance of additional resonance lines. The calculated
+signatures of this transition are consistent with recent experimental results
+[S. M. Frolov et al., Phys. Rev. Lett. 109, 236805 (2012)].",1303.0211v2
+2013-05-16,Interplay between edge and bulk states in silicene nanoribbon,"We investigate the interplay between the edge and bulk states, induced by the
+Rashba spin-orbit coupling, in a zigzag silicene nanoribbon in the presence of
+an external electric field. The interplay can be divided into two kinds, one is
+the interplay between the edge and bulk states with opposite velocities, and
+the other is that with the same velocity direction. The former can open small
+direct spin-dependent subgaps. A spin-polarized current can be generated in the
+nanoribbon as the Fermi energy is in the subgaps. While the later can give rise
+to the spin precession in the nanoribbon. Therefore, the zigzag silicene
+nanoribbon can be used as an efficient spin filter and spin modulation device.",1305.3684v1
+2014-08-20,Effects of interaction on field-induced resonances in confined Fermi liquid,"We consider the two-dimensional electron gas confined laterally to a narrow
+channel by a harmonic potential. As the Zeeman splitting matches the
+intersubband separation the nonlocal spin polarization develops a minimum as
+reported by Frolov et al. [Nature (London) 458, 868 (2009)]. This phenomenon
+termed Ballistic Spin Resonance is due to the degeneracy between the nearest
+oppositely polarized subbands that is lifted by spin-orbit coupling. We showed
+that the resonance survives the weak and short-range interaction. The latter
+detunes it and as a result shifts the Zeeman splitting at which the minimum in
+spin polarization occurs. Here this shift is attributed to the absence of Kohn
+theorem for the spin sloshing collective mode. We characterized the shift due
+to weak interaction qualitatively by analyzing the spin sloshing mode within
+the Fermi liquid phenomenology.",1408.4707v2
+2015-05-31,Thermoelectric response of spin polarization in Rashba spintronic systems,"Motivated by recent discovery of strongly spin-orbit coupled two-dimensional
+(2D) electron gas near the surface of Rashba semiconductors BiTeX (X=Cl, Br,
+I), we calculate thermoelectric responses of spin polarization in 2D Rashba
+model using an exact solution of the linearized Boltzmann equation for elastic
+scattering. When the Fermi energy $E_{F}$ lies below the band crossing point we
+find a non-Edelstein electric-field induced spin polarization which is linear
+in $E_{F}$. We show that the Mott-like relation between spin polarizations
+induced by the temperature gradient and electric field breaks down
+significantly when $E_{F}$ lies in the vicinity of the band crossing point. As
+the temperature tends to zero, the temperature-gradient induced spin
+polarization vanishes. These results differ from previous ones obtained by
+relaxation time approximations.",1506.00203v2
+2015-06-26,Spin-dependent coherent transport in a double quantum dot system,"We study spin-resolved resonant tunneling in a system of two quantum dots
+sandwiched between doped quantum wells. In the coherent (Dicke) regime, i.e.,
+when quantum dot separation is smaller than the Fermi wavelength in a
+two-dimensional electron gas in quantum wells, application of an in-plane
+magnetic field leads to a pronounced spin-resolved structure of the conductance
+peak lineshape even for very small Zeeman splitting of the quantum dots'
+resonant levels. In the presence of electron-gas spin-orbit coupling, this
+spin-resolved structure gets washed out due to Fermi surface deformation in the
+momentum space. We also show that Aharonov-Bohm flux penetrating the area
+enclosed by electron tunneling pathways completely destroys conductance spin
+structure.",1506.08214v2
+2016-04-05,Effective spin dephasing mechanism in confined two-dimensional topological insulators,"A Kramers pair of helical edge states in quantum spin Hall effect (QSHE) is
+robust against normal dephasing but not robust to spin dephasing. In our work,
+we provide an effective spin dephasing mechanism in the puddles of
+two-dimensional (2D) QSHE, which is simulated as quantum dots modeled by 2D
+massive Dirac Hamiltonian. We demonstrate that the spin dephasing effect can
+originate from the combination of the Rashba spin-orbit coupling and
+electron-phonon interaction, which gives rise to inelastic backscattering in
+edge states within the topological insulator quantum dots, although the
+time-reversal symmetry is preserved throughout. Finally, we discuss the
+tunneling between extended helical edge states and local edge states in the QSH
+quantum dots, which leads to backscattering in the extended edge states. These
+results can explain the more robust edge transport in InAs/GaSb QSH systems.",1604.01194v1
+2016-06-23,Rashba-Dresselhaus spin-splitting in the bulk ferroelectric oxide BiAlO$_3$,"It has been recently suggested that the coexistence of ferroelectricity and
+Rashba-like spin-splitting effects due to spin-orbit coupling in a single
+material may allow for a non-volatile electric control of spin degrees of
+freedom. In the present work, we compared the structural and ferroelectric
+properties of tetragonal and rhombohedral phases of ferroelectric BiAlO$_3$ by
+means of density-functional calculations. In both phases, we carefully
+investigated Rashba and Dresselhaus effects, giving rise to spin-splitting in
+their bulk electronic structure, particularly near the conduction band minimum,
+supplementing our first-principles results with an effective $ k\cdot p$ model
+analysis. The full reversal of the spin texture with ferroelectric polarization
+switching was also predicted. BiAlO$_3$ can therefore be considered as the
+first known oxide to exhibit a coexistence of ferroelectricity and
+Rashba-Dresselhaus effects.",1606.07400v2
+2017-02-03,Spin qubit manipulation of acceptor bound states in group IV quantum wells,"The large spin-orbit coupling in the valence band of group IV semiconductors
+provides an electric field knob for spin-qubit manipulation. This fact can be
+exploited with acceptor based qubits. Spin manipulation of holes bound to
+acceptors in engineered SiGe quantum wells depends very strongly on the
+electric field applied and on the heterostructure parameters. The g-factor is
+enhanced by the Ge content and can be tuned by shifting the hole wave-function
+between the heterostructure constituent layers. The lack of inversion symmetry
+induced both by the quantum well and the electric fields together with the
+g-factor tunability allows the possibility of different qubit manipulation
+methods such as electron spin resonance, electric dipole spin resonance and
+g-tensor modulation resonance. Rabi frequencies up to hundreds of MHz can be
+achieved with heavy-hole qubits, and of the order of GHz with light-hole
+qubits.",1702.00960v1
+2017-02-23,Nematic order on the surface of a three-dimensional topological insulator,"We study the spontaneous breaking of rotational symmetry in the helical
+surface state of three-dimensional topological insulators due to strong
+electron-electron interactions, focusing on time-reversal invariant nematic
+order. Owing to the strongly spin-orbit coupled nature of the surface state,
+the nematic order parameter is linear in the electron momentum and necessarily
+involves the electron spin, in contrast with spin-degenerate nematic Fermi
+liquids. For a chemical potential at the Dirac point (zero doping), we find a
+first-order phase transition at zero temperature between isotropic and nematic
+Dirac semimetals. This extends to a thermal phase transition that changes from
+first to second order at a finite-temperature tricritical point. At finite
+doping, we find a transition between isotropic and nematic helical Fermi
+liquids that is second order even at zero temperature. Focusing on finite
+doping, we discuss various observable consequences of nematic order, such as
+anisotropies in transport and the spin susceptibility, the partial breakdown of
+spin-momentum locking, collective modes and induced spin fluctuations, and
+non-Fermi liquid behavior at the quantum critical point and in the nematic
+phase.",1702.07364v2
+2017-08-02,The Formation of Rapidly Rotating Black Holes in High Mass X-ray Binaries,"High mass X-ray binaries (HMXRBs) like Cygnus X-1, host some of the most
+rapidly spinning black holes (BHs) known to date, reaching spin parameters $a
+\gtrsim 0.84$. However, there are several effects that can severely limit the
+maximum BH spin parameter that could be obtained from direct collapse, such as
+tidal synchronization, magnetic core-envelope coupling and mass loss. Here we
+propose an alternative scenario where the BH is produced by a {\it failed}
+supernova (SN) explosion that is unable to unbind the stellar progenitor. A
+large amount of fallback material ensues, whose interaction with the secondary
+naturally increases its overall angular momentum content, and therefore, the
+spin of the BH when accreted. Through SPH hydrodynamic simulations, we studied
+the unsuccessful explosion of a $8M_{\odot }$ pre-SN star in a close binary
+with a $12M_{\odot}$ companion with an orbital period of $\approx1.2$ days,
+finding that it is possible to obtain a BH with a high spin parameter
+$a\gtrsim0.8$ even when the expected spin parameter from direct collapse is $a
+\lesssim 0.3$. This scenario also naturally explains the atmospheric metal
+pollution observed in HMXRB stellar companions.",1708.00570v1
+2018-11-04,Spin polarization through Intersystem Crossing in the silicon vacancy of silicon carbide,"Silicon carbide (SiC)-based defects are promising for quantum communications,
+quantum information processing, and for the next generation of quantum sensors,
+as they feature long coherence times, frequencies near the telecom, and optical
+and microwave transitions. For such applications, the efficient initialization
+of the spin state is necessary. We develop a theoretical description of the
+spin polarization process by using the intersystem crossing of the silicon
+vacancy defect, which is enabled by a combination of optical driving,
+spin-orbit coupling, and interaction with vibrational modes. By using distinct
+optical drives, we analyze two spin polarization channels. Interestingly, we
+find that different spin projections of the ground state manifold can be
+polarized. This work helps to understand initialization and readout of the
+silicon vacancy and explains some existing experiments with the silicon vacancy
+center in SiC.",1811.01398v1
+2020-07-07,Heisenberg-Kitaev model in a magnetic field: $1/S$ expansion,"The exact solution of Kitaev's spin-$1/2$ honeycomb spin-liquid model has
+sparked an intense search for Mott insulators hosting bond-dependent Kitaev
+interactions, of which $\mathrm{Na}_{2}\mathrm{IrO}_{3}$ and
+$\alpha-\mathrm{RuCl}_{3}$ are prime examples. Subsequently, it has been
+proposed that also spin-$1$ and spin-$3/2$ analogs of Kitaev interactions may
+occur in materials with strong spin-orbit coupling. As a minimal model to
+describe these Kitaev materials, we study the Heisenberg-Kitaev Hamiltonian in
+a consistent $1/S$ expansion, with $S$ being the spin size. We present a
+comprehensive study of this model in the presence of an external magnetic field
+applied along two different directions, [001] and [111], for which an intricate
+classical phase diagram has been reported. In both settings, we employ
+spin-wave theory in a number of ordered phases to compute phase boundaries at
+the next-to-leading order in $1/S$ and show that quantum corrections
+substantially modify the classical phase diagram. More broadly, our work
+presents a consistent route to investigate the leading quantum corrections in
+spin models that break spin-rotational symmetry.",2007.03717v2
+2014-03-26,Proposal for an ac spin current source,"We propose an ac current source that can be tuned from a pure charge to a
+pure spin current source. The device consists of two mesoscopic capacitors
+attached to a two-dimensional strip of a topological insulator. The change from
+charge to spin current is controlled by an offset in the top gate potentials
+that drive the capacitors. In addition to this setup, which anticipates the
+experimental realisation of quantum point contacts in topological insulators,
+we propose an analogous source in the quantum Hall regime which only relies on
+presently available building blocks. To this end, we calculate the band
+structure of a topological insulator in a magnetic field. The intrinsic
+spin-orbit coupling, together with a split gate, allows for an analogous
+source, where charge and spin current can be manipulated. The realisation of
+the device as well as the detection of the ac spin current are within reach of
+present experimental technology.",1403.6674v2
+2017-01-03,Momentum-Space Spin Texture in a Topological Superconductor,"A conventional superconductor with spin-orbit coupling turns into a
+topological superconductor beyond a critical strength of the Zeeman energy. The
+spin-expectation values $\mathbf{S}(\mathbf{k})$ in momentum space trace this
+transition via a characteristic change in the topological character of the spin
+texture within the Brillouin zone. At the transition the skyrmion counting
+number switches from 0 to 1/2 identifying the topological superconductor via
+its meron-like spin texture. The change in the skyrmion counting number is
+crucially controlled by singular points of the map
+$\mathbf{S}(\mathbf{k})/|\mathbf{S}(\mathbf{k})|$ from the Brillouin zone, i.e.
+a torus, to the unit sphere. The complexity of this spin-map is discussed at
+zero temperature as well as for the extension to finite temperatures.",1701.00788v1
+2017-04-28,Significant Dzyaloshinskii-Moriya Interaction at Graphene-Ferromagnet Interfaces due to Rashba-effect,"The possibility of utilizing the rich spin-dependent properties of graphene
+has attracted great attention in pursuit of spintronics advances. The promise
+of high-speed and low-energy consumption devices motivates a search for layered
+structures that stabilize chiral spin textures such as topologically protected
+skyrmions. Here we demonstrate that chiral spin textures are induced at
+graphene/ferromagnetic metal interfaces. This is unexpected because graphene is
+a weak spin-orbit coupling material and is generally not expected to induce
+sufficient Dzyaloshinskii-Moriya interaction to affect magnetic chirality. We
+demonstrate that graphene induces a new type of Dzyaloshinskii-Moriya
+interaction due to a Rashba effect. First-principles calculations and
+experiments using spin-polarized electron microscopy show that this
+graphene-induced Dzyaloshinskii-Moriya interaction can have similar magnitude
+as at interfaces with heavy metals. This work paves a new path towards
+two-dimensional material based spin orbitronics.",1704.09023v1
+2011-11-07,Effects of scattering area shape on spin conductance in a four-terminal spin-Hall setup,"We study spin conductance in a ballistic and quasi-ballistic two dimensional
+electron system with Rasbha spin-orbit coupling. The system has a four-terminal
+geometry with round corners at the connection to the leads. It is found that by
+going from sharp corners to more round corners in the ballistic system the
+energy depended spin conductance goes from being relatively flat to a curve
+showing a series of minima and maxima. It is also found that when changing the
+size of the terminal area by modifying the roundness of the terminal corners
+the maxima and minima in the transverse spin conductance are shifted in energy.
+This shift is due increased (decreased) energy for smaller (larger) terminal
+area. These results were also found to be reasonably stable in quasi-ballistic
+systems.",1111.1529v1
+2012-04-24,Spin Configuration and Scattering Rates on the Heavily Electron-doped Surface of Topological Insulator Bi$_2$Se$_3$,"Heavily electron-doped surfaces of Bi$_2$Se$_3$ have been studied by spin and
+angle resolved photoemission spectroscopy. Upon doping, electrons occupy a
+series of {\bf k}-split pairs of states above the topological surface state.
+The {\bf k}-splitting originates from the large spin-orbit coupling and results
+in a Rashba-type behavior, unequivocally demonstrated here via the spin
+analysis. The spin helicities of the lowest laying Rashba doublet and the
+adjacent topological surface state alternate in a left-right-left sequence.
+This spin configuration sets constraints to inter-band scattering channels
+opened by electron doping. A detailed analysis of the scattering rates suggests
+that intra-band scattering dominates with the largest effect coming from
+warping of the Fermi surface.",1204.5263v1
+2012-04-24,Non-Abelian spin singlet states of two-component Bose gases in artificial gauge fields,"We study strongly correlated phases of a pseudo-spin-1/2 Bose gas in an
+artificial gauge field using the exact diagonalization method. The atoms are
+confined in two dimensions and interact via a two-body contact potential. In
+Abelian gauge fields, pseudo-spin singlets are favored by pseudo-spin
+independent interactions. We find a series of incompressible phases at fillings
+\nu=2k/3. By comparison with the non-Abelian spin singlet (NASS) states,
+constructed as zero-energy eigenstates of a (k+1)-body contact interaction, we
+classify the non-trivial topology of the states. An additional spin-orbit
+coupling is shown to switch between NASS-like states and spin-polarized phases
+from the Read-Rezayi series.",1204.5423v2
+2012-04-26,Approximate Spin and Pseudospin Solutions of the Dirac equation with Rosen-Morse Potential including a Coulomb Tensor Interaction,"By applying the Pekeris-type approximation to deal with the (pseudo or)
+centrifugal term, the spin and pseudospin symmetry solutions of the Dirac
+equation for the Rosen-Morse potential including a Coulomb-like tensor
+potential with arbitrary spin-orbit coupling quantum number $\kappa$ are
+obtained by standard method. It has been shown from the numerical results that
+the degeneracies between spin and pseudospin state doublets are removed by the
+tensor interaction. Special case of this potential, that is, the spin and
+pseudospin solutions of the Dirac equation with the modified P\""{o}schl-Teller
+potential including a tensor interaction is also considered. The results
+obtained in this case show that the tensor interaction removes the degeneracies
+between the members of doublets states in spin and pseudospin symmetries.",1204.5898v1
+2015-12-23,Giant room temperature interface spin Hall and inverse spin Hall effects,"The spin Hall angle (SHA) is a measure of the efficiency with which a
+transverse spin current is generated from a charge current by the spin-orbit
+coupling and disorder in the spin Hall effect (SHE). In a study of the SHE for
+a Pt$|$Py (Py=Ni$_{80}$Fe$_{20}$) bilayer using a first-principles scattering
+approach, we find a SHA that increases monotonically with temperature and is
+proportional to the resistivity for bulk Pt. By decomposing the room
+temperature SHE and inverse SHE currents into bulk and interface terms, we
+discover a giant interface SHA that dominates the total inverse SHE current
+with potentially major consequences for applications.",1512.07418v2
+2016-05-16,Manifestation of extrinsic spin Hall effect in superconducting structures: Non-dissipative magnetoelectric effects,"We present a comprehensive quasiclassical approach for studying transport
+properties of superconducting diffusive hybrid structures in the presence of
+extrinsic spin-orbit coupling. We derive a generalized Usadel equation and
+boundary conditions that in the normal state reduce to the drift-diffusion
+theory governing the spin-Hall effect in inversion symmetric materials. These
+equations predict the non-dissipative spin-galvanic effect, that is the
+generation of supercurrents by a spin-splitting field, and its inverse -- the
+creation of magnetic moment by a supercurrent. These effects can be seen as
+counterparts of the spin-Hall, anomalous Hall and their inverse effects in the
+superconducting state. Our theory opens numerous possibilities for using
+superconducting structures in magnetoelectronics.",1605.04689v2
+2016-08-08,Biaxial-stress-driven full spin polarization in ferromagnetic hexagonal chromium telluride,"It is important to spintronics to achieve fully-spin-polarized magnetic
+materials that are stable and can be easily fabricated. Here, through
+systematical density-functional-theory investigations, we achieve high and even
+full spin polarization for carriers in the ground-state phase of CrTe by
+applying tensile biaxial stress. The resulting strain is tensile in the xy
+plane and compressive in the z axis. With the in-plane tensile strain
+increasing, the ferromagnetic order is stable against antiferromagnetic
+fluctuations, and a half-metallic ferromagnetism is achieved at an in-plane
+strain of 4.8%. With the spin-orbit coupling taken into account, the spin
+polarization is equivalent to 97% at the electronic phase transition point, and
+then becomes 100.0% at the in-plane strain of 6.0%. These make us believe that
+the full-spin-polarized ferromagnetism in this stable and easily-realizable
+hexagonal phase could be realized soon, and applied in spintronics.",1608.02405v3
+2017-12-18,Frustrated superfluids in a non-Abelian flux,"We study possible superfluid states of the Rashba spin-orbit coupled (SOC)
+spinor bosons with the spin anisotropic interaction $ \lambda $ hopping in a
+square lattice. The frustrations from the non-abelian flux due to the SOC leads
+to novel spin-bond correlated superfluids. By using a recently developed
+systematic ""order from quantum disorder"" analysis, we not only determine the
+true quantum ground state, but also evaluate the mass gap in the spin sector at
+$ \lambda < 1 $, especially compute the the excitation spectrum of the
+Goldstone mode in the spin sector at $ \lambda=1 $ which would be quadratic
+without the analysis. The analysis also leads to different critical exponents
+on the two sides of the 2nd order transition driven by a roton touchdown at $
+\lambda=1 $. The intimate analogy at $ \lambda=1 $ with the charge neutral
+Goldstone mode in the pseudo-spin sector in the Bilayer quantum Hall systems at
+the total filling factor $ \nu_T=1 $ are stressed. The experimental
+implications and detections of these novel phenomena in cold atoms loaded on a
+optical lattice are presented.",1712.06545v1
+2018-01-31,Proposal for detecting nodal-line semimetal surface-states with resonant spin-flipped reflection,"Topological nodal-line semimetals are predicted to exhibit unique
+drumhead-like surface states (DSS). Yet, a direct detection of such states
+remains a challenge. Here, we propose spin-resolved transport in a junction
+between a normal metal and a spin-orbit coupled nodal-line semimetal as the
+mechanism for their detection. Specifically, we find that in such a device, the
+DSS induce resonant spin-flipped reflection. This effect can be probed by both
+vertical spin transport and lateral charge transport between anti-parallel
+magnetic terminals. In the tunneling limit of the junction, both spin and
+charge conductances exhibit a resonant peak around zero energy, providing a
+unique evidence of the DSS. This signature is robust to both dispersive DSS and
+interface disorder. Based on numerical calculations, we show that the scheme
+can be implemented in the topological semimetal HgCr$_2$Se$_4$.",1801.10337v3
+2019-09-10,Kitaev Magnetism and Fractionalized Excitations in Double Perovskite Sm2ZnIrO6,"The quest for Kitaev spin liquids in particular three dimensional solids is
+long sought goal in condensed matter physics, as these states may give rise to
+exotic new types of quasi-particle excitations carrying fractional quantum
+numbers namely Majorana Fermionic excitations. Here we report the experimental
+signature of this characteristic feature of the Kitaev spin liquid via Raman
+measurements. Sm2ZnIrO6 is a strongly spin orbit coupled Mott insulator, where
+Jeff = 1/2 controls the physics, which provide striking evidence for this
+characteristic feature of the Kitaev spin liquid. As the temperature is
+lowered, we find that the spin excitations form a continuum in contrast to the
+conventional sharp modes expected in ordered antiferromagnets. Our observation
+of a broad magnetic continuum and anomalous renormalization of the phonon
+self-energy parameters evidence the existence of Majorana fermions from spin
+fractionalization in double perovskites structure as theoretically conjectured
+in a Kitaev-Heisenberg geometrically frustrated double perovskite systems.",1909.04322v2
+2020-02-19,Effective Hamiltonian model for helically constrained quantum systems within adiabatic perturbation theory: application to the Chirality-Induced Spin Selectivity (CISS) Effect,"The chirality-induced spin selectivity (CISS) effect has been confirmed
+experimentally for a large class of organic molecules. Adequately modeling the
+effect remains a challenging task, with both phenomenological models and
+first-principle simulations yielding inconclusive results. Building upon a
+previously presented model by K. Michaeli and R. Naaman (J. Phys. Chem C 123,
+17043 (2019)) we systematically investigate an effective 1-dimensional model
+derived as the limit of a 3-dimensional quantum system with strong confinement
+and including spin-orbit coupling. Having a simple analytic structure, such
+models can be considered a minimal setup for the description of spin-dependent
+effects. We use adiabatic perturbation theory to provide a mathematically sound
+approximation procedure applicable to a large class of spin-dependent continuum
+models. We take advantage of the models simplicity by analyzing its structure
+to gain a better understanding how the occurrence and magnitude of spin
+polarization effects relate to the model's parameters and geometry.",2002.08052v1
+2017-05-08,$θ_0$ thermal Josephson junction,"We predict the thermal counterpart of the anomalous Josephson effect in
+superconductor/ferromagnet/superconductor junctions with non-coplanar magnetic
+texture. The heat current through the junction is shown to have the
+phase-sensitive interference component proportional to $\cos(\theta -
+\theta_0)$, where $\theta$ is the Josephson phase difference and $\theta_0$ is
+the texture-dependent phase shift. In the generic tri-layer magnetic structure
+with the spin-filtering tunnel barrier $\theta_0$ is determined by the spin
+chirality of magnetic configuration and can be considered as the direct
+manifestation of the energy transport with participation of spin-triplet Cooper
+pairs. In case of the ideal spin filter the phase shift is shown to be robust
+against spin relaxation caused by the spin-orbital scattering. Possible
+applications of the coupling between heat flow and magnetic precession are
+discussed.",1705.02835v2
+2019-02-22,Coexistent spin-triplet superconducting and ferromagnetic phases induced by the Hund's rule coupling and electronic correlations II: Effect of applied magnetic field,"Recently proposed local-correlation-driven pairing mechanism, describing
+ferromagnetic phases (FM1 and FM2) coexisting with spin-triplet
+superconductivity (SC) within a single orbitally degenerate Anderson lattice
+model, is extended to the situation with applied Zeeman field. The model
+provides and rationalizes in a semiquantitative manner the principal features
+of the phase diagram observed for $\mathrm{UGe_2}$ in the field absence [cf.
+Phys. Rev. B $\mathbf{97}$, 224519 (2018)]. As spin-dependent effects play a
+crucial role for both the ferromagnetic and SC states, the role of the Zeeman
+field is to single out different stable spin-triplet SC phases. This analysis
+should thus be helpful in testing the proposed real-space pairing mechanism,
+which may be regarded as complementary to spin-fluctuation theory suitable for
+$\mathrm{^3He}$. Specifically, we demonstrate that the presence of the two
+distinct phases, FM1 and FM2, and associated field-driven metamagnetic
+transition between them, induce respective metasuperconducting phase
+transformation. At the end, we discuss briefly how the spin fluctuations might
+be incorporated as a next step into the considered here renormalized
+quasiparticle picture.",1902.08444v2
+2019-04-30,Electric-field control and noise protection of the flopping-mode spin qubit,"We propose and analyze a novel ""flopping-mode"" mechanism for electric dipole
+spin resonance based on the delocalization of a single electron across a double
+quantum dot confinement potential. Delocalization of the charge maximizes the
+electronic dipole moment compared to the conventional single dot spin resonance
+configuration. We present a theoretical investigation of the flopping-mode spin
+qubit properties through the crossover from the double to the single dot
+configuration by calculating effective spin Rabi frequencies and single-qubit
+gate fidelities. The flopping-mode regime optimizes the artificial spin-orbit
+effect generated by an external micromagnet and draws on the existence of an
+externally controllable sweet spot, where the coupling of the qubit to charge
+noise is highly suppressed. We further analyze the sweet spot behavior in the
+presence of a longitudinal magnetic field gradient, which gives rise to a
+second order sweet spot with reduced sensitivity to charge fluctuations.",1904.13117v2
+2019-12-31,Identification of Spin-Triplet Superconductivity through a Helical-Chiral Phase Transition in Sr$_2$RuO$_4$ Thin-Films,"Despite much effort for over the two decades, the paring symmetry of a
+Sr$_2$RuO$_4$ superconductor has been still unclear. In this Rapid
+Communication, motivated by the recent rapid progress in fabrication techniques
+for Sr$_2$RuO$_4$ thin-films, we propose a promising strategy for identifying
+the spin-triplet superconductivity in the thin-film geometry by employing an
+antisymmetric spin-orbit coupling potential and a Zeeman potential due to an
+external magnetic field. We demonstrate that a spin-triplet superconducting
+thin-film undergoes a phase transition from a helical state to a chiral state
+by increasing the applied magnetic field. This phase transition is accompanied
+by a drastic change in the property of surface Andreev bound states. As a
+consequence, the helical-chiral phase transition, which is unique to the
+spin-triplet superconductors, can be detected through a sudden change in a
+tunneling conductance spectrum of a normal-metal/superconductor junction.
+Importantly, our proposal is constructed by combining fundamental and rigid
+concepts regarding physics of spin-triplet superconductivity.",1912.13250v1
+2020-05-12,Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions,"We explore the role of proximity-induced odd-frequency pairing in the
+thermoelectricity of a ferromagnet when coupled to a conventional $s$-wave
+spin-singlet superconductor through a spin-active interface. By varying both
+the polarization and its direction in the ferromagnet and the interfacial
+spin-orbit interaction strength, we analyze the behavior of all
+proximity-induced pair amplitudes in the ferromagnet and their contributions to
+the thermoelectric coefficients. Based on our results for the Seebeck
+coefficient, we predict that odd-frequency spin-triplet Cooper pairs are much
+efficient than the conventional spin-singlet even-frequency pairs in enhancing
+thermoelectricity of the junction, especially mixed-spin triplet pairing is
+favorable. Our results on the thermoelectric figure of merit show that
+ferromagnet/superconductor junctions are very good thermoelectric systems when
+superconductivity is dominated by odd-frequency pairing.",2005.05950v2
+2019-06-05,Noncollinear Antiferromagnetic Order and Effect of Spin-Orbit Coupling in Spin-1 Honeycomb Lattice,"Motivated by the recently synthesized insulating nickelate Ni$_2$Mo$_3$O$_8$,
+which has been reported to have an unusual non-collinear magnetic order of
+Ni$^{2+}$ $S=1$ moments with a nontrivial angle between adjacent spins, we
+construct an effective spin-1 model on the honeycomb lattice, with the exchange
+parameters determined with the help of first principles electronic structure
+calculations. The resulting bilinear-biquadratic model, supplemented with the
+realistic crystal-field induced anisotropy, favors the collinear N\'eel state.
+We find that the crucial key to explaining the observed noncollinear spin
+structure is the inclusion of the Dzyaloshinskii--Moriya (DM) interaction
+between the neighboring spins. By performing the variational mean-field and
+linear spin-wave theory (LSWT) calculations, we determine that a realistic
+value of the DM interaction $D\approx 2.78$ meV is sufficient to quantitatively
+explain the observed angle between the neighboring spins. We furthermore
+compute the spectrum of magnetic excitations within the LSWT and random-phase
+approximation (RPA) which should be compared to future inelastic neutron
+measurements.",1906.02215v3
+2020-09-06,Spin photogalvanic effect in two-dimensional collinear antiferromagnets,"Spin photogalvanic effect (SPGE) is an efficient method to generate a spin
+current by photoexcitation in a contactless and ultra-fast way. In
+two-dimensional (2D) collinear antiferromagnetic (AFM) materials that preserve
+the combined time-reversal (T) and inversion (I) symmetry (i.e., TI symmetry),
+we find that the photogalvanic currents in two magnetic sublattices carry
+different kinds of spins and propagate in opposite direction if the spin-orbit
+coupling is negligible, resulting in a pure spin current without net charge
+current. Based on the first-principles calculations, we show that two
+experimentally synthesized 2D collinear AFM materials, monolayer MnPS$_3$ and
+bilayer CrCl$_3$, host the required symmetry and support sizable SPGE. The
+predicted SPGE in 2D collinear AFM materials makes them promising platforms for
+nano spintronics devices.",2009.02748v1
+2020-09-25,Spin-selective resonant tunneling induced by Rashba spin-orbit interaction in semiconductor nanowire,"We consider a single electron confined within a quantum wire in a system of
+two electrostatically-induced QDs defined by nearby gates. The time-varying
+electric field, of single GHz frequency, perpendicular to the quantum wire, is
+used to induce the Rashba coupling and enable spin-dependent resonant tunneling
+of the electron between two adjacent potential wells with fidelity over 99.5%.
+This effect can be used for the high fidelity all-electrical electron-spin
+initialization or readout in the spin-based quantum computer. In contrast to
+other spin initialization methods, our technique can be performed adiabatically
+without increase in the energy of the electron. Our simulations are supported
+by a realistic self-consistent time-dependent Poisson-Schroedinger
+calculations.",2009.12439v2
+2021-03-01,Charge Redistribution and Spin Polarization Driven by Correlation Induced Electron Exchange in Chiral Molecules,"Chiral induced spin selectivity is a phenomenon that has been attributed to
+chirality, spin-orbit interactions, and non-equilibrium conditions, while the
+role of electron exchange and correlations have been investigated only
+marginally until very recently. However, as recent experiments show that chiral
+molecules acquire a finite spin-polarization merely by being in contact with a
+metallic surface, these results suggest that electron correlations play a more
+crucial role for the emergence of the phenomenon than previously thought. Here,
+it is demonstrated that molecular vibrations give rise to molecular charge
+redistribution and accompanied spin-polarization when coupling a chiral
+molecule to a non-magnetic metal. It is, moreover, shown that enantiomer
+separation, due to spin-polarization intimately related to the chirality, can
+be understood in terms of the proposed model.",2103.00840v1
+2021-09-30,Magneto-optical Kerr spectra of gold induced by spin accumulation,"We report the magneto optic Kerr effect (MOKE) angle of Au magnetically
+excited by spin accumulation. We perform time resolved polar MOKE measurements
+on Au/Co heterostructures. In our experiment, the ultrafast optical excitation
+of the Co drives spin accumulation into an adjacent Au layer. The spin
+accumulation, together with spin-orbit coupling, leads to non-zero terms in the
+off-diagonal conductivity tensor of Au, which we measure by recording the
+polarization and ellipticity of light reflected from the Au surface for photon
+energies between 1.3 and 3.1 eV. At energies near the interband transition
+threshold of Au, the Kerr rotation per A/m exceeds 1 urad. Typical values for
+Kerr rotation per moment in transition ferromagnetic metals like Ni are < 10
+nrad per A/m, while predicted values for heavy metals like Pt or W are < 13
+nrad per A/m. The exceptional sensitivity of the optical properties of Au to
+spin magnetic moments make Au to be an exceptionally sensitive optical
+magnetometer, with potential applications in the development of optospintronic
+technologies.",2109.14954v3
+2021-10-19,Ising and XY paramagnons in two-dimensional 2H-NbSe$_2$,"Paramagnons are the collective modes that govern the spin response of nearly
+magnetic conductors. In some cases they mediate electron pairing leading to
+superconductivity. This scenario may occur in 2H-NbSe$_2$ monolayers, that
+feature spin-valley coupling on account of spin-orbit interactions and their
+lack of inversion symmetry. Here we explore spin anisotropy of paramagnons both
+for non-centrosymmetric Kane-Mele-Hubbard models for 2H-NbSe$_2$ monolayers
+described with a DFT-derived tight-binding model. In the infinite wavelength
+limit we find spatially uniform paramagnons with energies around $1$~meV that
+feature a colossal off-plane uniaxial magnetic anisotropy, with quenched
+transversal spin response. At finite wave vectors, longitudinal and transverse
+channels reverse roles: XY fluctuations dominate within a significant portion
+of the Brillouin zone. Our results show that 2H-NbSe$_2$ is close to a
+Coulomb-driven in-plane (XY) spin density wave instability.",2110.09809v2
+2021-10-25,Superconducting triplet rim currents in a spin-textured ferromagnetic disk,"Since the discovery of the long-range superconducting proximity effect, the
+interaction between spin-triplet Cooper pairs and magnetic structures such as
+domain walls and vortices has been the subject of intense theoretical
+discussions, while the relevant experiments remain scarce. We have developed
+nanostructured Josephson junctions with highly controllable spin texture, based
+on a disk-shaped Nb/Co bilayer. Here, the vortex magnetization of Co and the
+Cooper pairs of Nb conspire to induce long-range triplet (LRT)
+superconductivity in the ferromagnet. Surprisingly, the LRT correlations emerge
+in highly localized (sub-80 nm) channels at the rim of the ferromagnet, despite
+its trivial band structure. We show that these robust rim currents arise from
+the magnetization texture acting as an effective spin-orbit coupling, which
+results in spin accumulation at the bilayer-vacuum boundary. Lastly, we
+demonstrate that by altering the spin texture of a single ferromagnet, both $0$
+and $\pi$-channels can be realized in the same device.",2110.13035v2
+2022-03-03,Symmetry-protected Dirac nodal lines and large spin Hall effect in $\mathbf{V_6Sb_4}$ with kagome bilayer,"Recently, a family of nonmagnetic kagome metals \textit{A}$\mathrm{V_3Sb_5}$
+(\textit{A}=K, Rb, and Cs) has attracted significant attention for realizing
+the intertwining of quantum order and nontrivial topology. However, these
+compounds have been identified to host complex band structures. Therefore, it
+is desirable to design and synthesize novel kagome materials with a simple band
+topology and good transport properties. In this study, using first-principles
+calculations, we present the electronic properties and the intrinsic spin Hall
+effect of V$_6$Sb$_4$, the latest experimentally synthesized vanadium-based
+compounds with a kagome bilayer. In the absence of spin-orbital coupling (SOC),
+this compound is a Dirac nodal line semimetal with symmetry-protected nodal
+rings near the Fermi level. Within the SOC, the spin-rotation symmetry breaks
+the gaps of the nodal rings with a small band gap. Furthermore, based on the
+Wannier tight-binding approach and the Kubo formula, we propose a large spin
+Hall effect in V$_6$Sb$_4$, which intrinsically originates from the spin Berry
+curvature. Our work further expands nonmagnetic kagome compounds for
+applications in spintronics accompanied by exotic quantum order.",2203.01558v1
+2022-05-18,Twist Angle Controlled Collinear Edelstein Effect in van der Waals Heterostructures,"The generation of spatially homogeneous spin polarization by application of
+electric current is a fundamental manifestation of symmetry-breaking
+spin--orbit coupling (SOC) in solid-state systems, which underpins a wide range
+of spintronic applications. Here, we show theoretically that twisted van der
+Waals heterostructures with proximity-induced SOC are candidates par excellence
+to realize exotic spin-charge transport phenomena due to their highly tunable
+momentum-space spin textures. Specifically, we predict that graphene/group-VI
+dichalcogenide bilayers support room temperature spin--current responses that
+can be manipulated via twist-angle control. For critical twist angles, the
+non-equilibrium spin density is pinned parallel to the applied current. This
+effect is robust against twist-angle disorder, with graphene/$\text{WSe}_{2}$
+possessing a critical angle (purely collinear response) of $\theta_{c} \simeq
+14^{\circ}$. A simple electrical detection scheme to isolate the collinear
+Edelstein effect is proposed.",2205.08804v2
+2022-06-07,Quantized spin pumping in topological ferromagnetic-superconducting nanowires,"Semiconducting nanowires with strong spin-orbit coupling in the presence of
+induced superconductivity and ferromagnetism can support Majorana zero modes.
+We study the pumping due to the precession of the magnetization in
+single-subband nanowires and show that spin pumping is robustly quantized when
+the hybrid nanowire is in the topologically nontrivial phase, whereas charge
+pumping is not quantized. Moreover, there exists one-to-one correspondence
+between the quantized conductance, entropy change and spin pumping in long
+topologically nontrivial nanowires but these observables are uncorrelated in
+the case of accidental zero-energy Andreev bound states in the trivial phase.
+Thus, we conclude that observation of correlated and quantized peaks in the
+conductance, entropy change and spin pumping would provide strong evidence of
+Majorana zero modes, and we elaborate how topological Majorana zero modes can
+be distinguished from quasi-Majorana modes potentially created by a smooth
+tunnel barrier at the lead-nanowire interface. Finally, we discuss peculiar
+interference effects affecting the spin pumping in short nanowires at very low
+energies.",2206.03527v2
+2022-06-20,Emergence of Rashba splitting and spin-valley properties in Janus MoGeSiP2As2 and WGeSiP2As2 monolayers,"First-principles calculations are performed to study the structural stability
+and spintronics properties of Janus MoGeSiP2As2 and WGeSiP2As2 monolayers. The
+high cohesive energies and the stable phonon modes confirm that both these
+structures are experimentally accessible. In contrast to pristine MoSi2P4, the
+Janus monolayers demonstrate reduced direct bandgaps and large spin-split
+states at K/-K. In addition, their spin textures exposed that breaking the
+mirror symmetry brings Rashba-type spin splitting in the systems which can be
+increased by using higher atomic spin-orbit coupling. The large valley spin
+splitting together with the Rashba splitting in these Janus monolayer
+structures can make a remarkable contribution to semiconductor valleytronics
+and spintronics.",2206.09737v1
+2022-08-17,$\mathbb{Z}_{2}$ Spin Hopf Insulator: Helical Hinge States and Returning Thouless Pump,"We introduce a time-reversal-symmetric analog of the Hopf insulator that we
+call a spin Hopf insulator. The spin Hopf insulator harbors nontrivial
+Kane-Mele $\Z_2$ invariants on its surfaces, and is the first example of a
+nonmagnetic delicate topological insulator with spin-orbit coupling. We show
+that the Kane-Mele $\Z_2$ topology on the surface is generically unstable, but
+can be stabilized by the addition of a composition of the particle hole and
+spatial inversion symmetry. Such a symmetry not only protects the surface
+$\Z_2$ invariant, but also protects gapless helical hinge states on the spin
+Hopf insulator. Furthermore, we show that in the presence of four-fold
+rotational symmetry, the spin Hopf insulator exhibits a returning Thouless
+pump, as well as surface states on sharp boundary terminations.",2208.08455v4
+2022-09-02,Accidental persistent spin textures in the proustite mineral family,"Persistent spin textures (PSTs) in momentum space have the potential to
+enable spintronic devices which are currently limited by low spin lifetimes in
+nonmagnetic spin-orbit coupled materials. We perform a first-principles study
+on the proustite mineral family, Ag$_3$BQ$_3$} (B=As,\,Sb; Q=S,\,Se), and show
+these chalcogenides exhibit a non-symmetry protected PST, which we refer to as
+symmetry-assisted PSTs. Chemical substitution can be used to tune the PST
+quality and properties, e.g., spin lifetime, and we find that a Rashba
+anisotropy criterion correlates with the PST area and spin lifetime for two of
+the three proustites examined. Last, we show that a first-order effective SOC
+Hamiltonian, often used in two-dimensional systems, is insufficient to describe
+the PST state in all proustites, suggesting that higher order models are
+necessary to fully describe PSTs in bulk three-dimensional materials.",2209.01109v1
+2022-09-23,Ballistic transport and spin dependent anomalous quantum tunnelling in Rashba-Zeeman and bilayer graphene hybrid structures,"In this work, we have studied the spin-dependent ballistic transport and
+anomalous quantum tunnelling in Bilayer Graphene (BLG) hybrid connected to two
+Rashba-Zeeman (RZ) leads under an external electric biasing. We investigated
+the transmission and conductance for the proposed system using scattering
+matrix formalism and Landauer - Buttiker formula considering a double
+delta-like barrier under a set of experimentally viable parameters. We found
+that the transmission characteristics are notably different for up and down
+spin incoming electrons depending upon the strength of magnetization. Moreover,
+the transmission of up and down spin electrons is found to be magnetization
+orientation dependent. The maximum tunnelling and conductance can be achieved
+by tuning biasing energy and magnetization strength and choosing a material
+with suitable Rashba Spin-Orbit Coupling (RSOC). This astonishing property of
+our system can be utilized in fabricating devices like spin filters. We found
+the Fano factor of our system is 0.4 under strong magnetization conditions
+while it reduces to 0.3 under low magnetization conditions. Moreover, we also
+noticed that the transmission and conductance significantly depend on the
+Rashba - Zeeman effect. So, considering a suitable RZ material, the tunnelling
+of the electrons can be tuned and controlled.",2209.11573v1
+2022-09-28,Spin and Valley Hall effects induced by asymmetric interparticle scattering,"We develop the theory of the spin and valley Hall effects in two-dimensional
+systems caused by asymmetric -- skew -- scattering of the quasiparticles. The
+collision integral is derived in the third order in the particle-particle
+interaction with account for the spin-orbit coupling both for bosons and
+fermions. It is shown that the scattering asymmetry appears only in the
+processes where the interaction between the particles in the initial and
+intermediate state is present. We show that for degenerate electrons or
+nondegenerate particles the spin and valley currents induced by interparticle
+collisions are suppressed with their steady-state values being proportional to
+the squared temperature or density, respectively. Our results imply non-Fermi
+liquid properties of electrons in the presence of electron-electron skew
+scattering. Strong deviations from conventional picture of interparticle
+scattering are also demonstrated for the skew scattering of two-dimensional
+degenerate bosons, e.g. excitons or exciton polaritons: The spin or valley
+current of degenerate bosons contains the enhancement factor exponentially
+growing with increase in the particle density.",2209.14173v1
+2022-10-25,Recent advances in hole-spin qubits,"In recent years, hole-spin qubits based on semiconductor quantum dots have
+advanced at a rapid pace. We first review the main potential advantages of
+these hole-spin qubits with respect to their electron-spin counterparts, and
+give a general theoretical framework describing them. The basic features of
+spin-orbit coupling and hyperfine interaction in the valence band are
+discussed, together with consequences on coherence and spin manipulation. In
+the second part of the article we provide a survey of experimental
+realizations, which spans a relatively broad spectrum of devices based on GaAs,
+Si, or Si/Ge heterostructures. We conclude with a brief outlook.",2210.13725v2
+2023-05-16,Spin scattering and Hall effects in monolayer Fe3GeTe2,"We theoretically show that the carrier transport in monolayer Fe3GeTe2
+experiences a transition between anomalous Hall effect and spin Hall effect
+when the spin polarization of disorders switches between out-of-plane and
+in-plane. These Hall effects are allowed when the magnetization is polarized
+in-plane, breaking the C3 rotation symmetry. The transition originates from the
+selection rule of spin scattering, the strong spin-orbit coupling, and the van
+Hove singularities near the Fermi surface. The scattering selection rule
+tolerates the sign change of the disorder spin, which provides a convenient
+method to detect the switching of antiferromagnetic insulators regardless of
+the interfacial roughness in a heterostructure. This provides a convenient
+platform for the study of 2D spintronics through various van-der-Waals
+heterostructures.",2305.09743v1
+2023-07-26,Electromagnon excitations in high temperature superconducting states,"In this article, we discover a fundamental excitation called electromagnon in
+the cuprate superconducting states. Doped holes render local inversion
+asymmetry which produces hidden Rashba spin-orbit coupling in copper-oxide
+plane. Rashba effect leads to Dzyaloshinskii-Moriya (DM) interaction between
+neighboring spins, which establishes a general spin Hamitonian combined with
+Heisenberg exchange interaction. The physical origin of spin fluctuations has
+been revealed from Rashba-induced DM term. Electromagnon excitations are found
+to result from spin fluctuations manifested as spin spiral states by hopping of
+doped holes in high temperature superconducting states. The frequency of
+electromagnon excitations, peak position of dielectric constant spectrum,
+decreases linearly with decrease of exchange interaction in various families of
+superconductors. Comparisons with superconductivity-induced B1g Raman peaks
+show good agreement and thus possibly provide the experimental evidences for
+electromagnon excitations in cuprates.",2307.14533v2
+2023-08-10,Protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a quantum-dot loop,"A quantum system constrained to a degenerate energy eigenspace can undergo a
+nontrival time evolution upon adiabatic driving, described by a non-Abelian
+Berry phase. This type of dynamics may provide logical gates in quantum
+computing that are robust against timing errors. A strong candidate to realize
+such holonomic quantum gates is an electron or hole spin qubit trapped in a
+spin-orbit-coupled semiconductor, whose twofold Kramers degeneracy is protected
+by time-reversal symmetry. Here, we propose and quantitatively analyze
+protocols to measure the non-Abelian Berry phase by pumping a spin qubit
+through a loop of quantum dots. One of these protocols allows to characterize
+the local internal Zeeman field directions in the dots of the loop. We expect a
+near-term realisation of these protocols, as all key elements have been already
+demonstrated in spin-qubit experiments. These experiments would be important to
+assess the potential of holonomic quantum gates for spin-based quantum
+information processing.",2308.05455v1
+2023-10-25,Photo-induced electronic and spin topological phase transitions in monolayer bismuth,"Ultrathin bismuth exhibits rich physics including strong spin-orbit coupling,
+ferroelectricity, nontrivial topology, and light-induced structural dynamics.
+We use \textit{ab initio} calculations to show that light can induce structural
+transitions to four transient phases in bismuth monolayers. These light-induced
+phases exhibit nontrivial topological character, which we illustrate using the
+recently introduced concept of spin bands and spin-resolved Wilson loops.
+Specifically, we find that the topology changes via the closing of the electron
+and spin band gaps during photo-induced structural phase transitions, leading
+to distinct edge states. Our study provides strategies to tailor electronic and
+spin topology via ultrafast control of photo-excited carriers and associated
+structural dynamics.",2310.16886v2
+2004-08-02,Electric generation of spin in crystals with reduced symmetry,"We propose a simple way of evaluating the bulk spin generation of an
+arbitrary crystal with a known band structure in the strong spin-orbit coupling
+limit. We show that, in the presence of an electric field, there exists an
+intrinsic torque term which gives rise to a nonzero spin generation rate. Using
+methods similar to those of recent experiments which measure spin polarization
+in semiconductors, this spin generation rate should be experimentally
+observable. The wide applicability of this effect is emphasized by explicit
+consideration of a range of examples: bulk wurtzite and strained zincblende
+(n-GaAs) lattices, as well as quantum well heterojunction systems.",0408020v2
+2009-09-04,Quantum Imaging of Topologically Unpaired Spin-Polarized Dirac Fermions,"The motion of a relativistic particle is linked to its spin by the Dirac
+equation. Remarkably, electrons in two-dimensional materials can mimic such
+Dirac particles but must always appear in pairs of opposite spin chirality.
+Using topological ideas of chiral boundary electrons wrapping a
+three-dimensional crystal with tuned spin-orbit coupling, we show that elusive
+unpaired Dirac fermions exist on the surface of a topological insulator parent
+matrix, pure antimony. Using scanning tunneling microscopy and angle-resolved
+photoemission spectroscopy we image coherent quantum interference between these
+particles, map their helical spin texture, and ultimately observe a transition
+to a single Dirac fermion distinguished by backscattering suppression via Berry
+phase interference. The robust dynamics of these unique spin-polarized carriers
+envisage future applications in spintronics and topological quantum
+computation.",0909.0921v2
+2010-01-10,Normal-State Hourglass Dispersion of the Spin Excitations in FeSe$_{x}$Te$_{1-x}$,"We use cold neutron spectroscopy to study the low-energy spin excitations of
+superconducting (SC) FeSe$_{0.4}$Te$_{0.6}$ and essentially non-superconducting
+(NSC) FeSe$_{0.45}$Te$_{0.55}$. In contrast to BaFe$_{2-x}$(Co,Ni)$_{x}$As$_2$,
+where the low-energy spin excitations are commensurate both in the SC and
+normal state, the normal-state spin excitations in SC FeSe$_{0.4}$Te$_{0.6}$
+are incommensurate and show an hourglass dispersion near the resonance energy.
+Since similar hourglass dispersion is also found in the NSC
+FeSe$_{0.45}$Te$_{0.55}$, we argue that the observed incommensurate spin
+excitations in FeSe$_{1-x}$Te$_{x}$ are not directly associated with
+superconductivity. Instead, the results can be understood within a picture of
+Fermi surface nesting assuming extremely low Fermi velocities and spin-orbital
+coupling.",1001.1505v2
+2010-03-02,Prediction of extremely long electron spin lifetimes at room temperature in wurtzite semiconductor quantum wells,"Many proposed spintronics devices require mobile electrons at room
+temperature with long spin lifetimes. One route to achieving this is to use
+quantum wells with tunable spin-orbit (SO) parameters. Research has focused on
+zinc-blende materials such as GaAs which do not have long spin lifetimes at
+room temperature. We show that wurtzite (w) materials, which possess smaller SO
+coupling due to being low-Z, are better suited for spintronics applications.
+This leads to predictions of spin lifetimes in w-AlN exceeding 2 ms at helium
+temperatures and, relevant to spintronic devices, spin lifetimes up to 0.5 $\mu
+s$ at room temperature.",1003.0494v2
+2011-05-18,Spintronic devices from bilayer graphene in contact to ferromagnetic insulators,"Graphene-based materials show promise for spintronic applications due to
+their potentially large spin coherence length. On the other hand, because of
+their small intrinsic spin-orbit interaction, an external magnetic source is
+desirable in order to perform spin manipulation. Because of the flat nature of
+graphene, the proximity interaction with a ferromagnetic insulator (FI) surface
+seems a natural way to introduce magnetic properties into graphene. Exploiting
+the peculiar electronic properties of bilayer graphene coupled with FIs, we
+show that it is possible to devise very efficient gate-tunable spin-rotators
+and spin-filters in a parameter regime of experimental feasibility. We also
+analyze the composition of the two spintronic building blocks in a
+spin-field-effect transistor.",1105.3609v2
+2011-09-26,Spin and Majorana polarization in topological superconducting wires,"We study a one-dimensional wire with strong Rashba and Dresselhaus spin-orbit
+coupling (SOC), which supports Majorana fermions when subject to a Zeeman
+magnetic field and in proximity of a superconductor. Using both analytical and
+numerical techniques we calculate the electronic spin texture of the Majorana
+end states. We find that the spin polarization of these states depends on the
+relative magnitude of the Rashba and Dresselhaus SOC components. Moreover, we
+define and calculate a local ""Majorana polarization"" and ""Majorana density"" and
+argue that they can be used as order parameters to characterize the topological
+transition between the trivial system and the system exhibiting Majorana bound
+modes. We find that the local ""Majorana polarization"" is correlated to the
+transverse spin polarization, and we propose to test the presence of Majorana
+fermions in a 1D system by a spin-polarized density of states measurement.",1109.5697v2
+2014-07-29,Controllable Schottky Barriers between MoS2 and Permalloy,"MoS2 is a layered two-dimensional material with strong spin-orbit coupling
+and long spin lifetime, which is promising for electronic and spintronic
+applications. However, because of its large band gap and small electron
+affinity, a considerable Schottky barrier exists between MoS2 and contact
+metal, hindering the further study of spin transport and spin injection in
+MoS2. Although substantial progress has been made in improving device
+performance, the existence of metal-semiconductor Schottky barrier has not yet
+been fully understood. Here, we investigate permalloy (Py) contacts to both
+multilayer and monolayer MoS2. Ohmic contact is developed between multilayer
+MoS2 and Py electrodes with a negative Schottky barrier, which yields a high
+field-effect mobility exceeding 55 cm2V-1s-1 at low temperature. Further, by
+applying back gate voltage and inserting different thickness of Al2O3 layer
+between the metal and monolayer MoS2, we have achieved a good tunability of the
+Schottky barrier height (down to zero). These results are important in
+improving the performance of MoS2 transistor devices; and it may pave the way
+to realize spin transport and spin injection in MoS2.",1407.7652v2
+2014-10-27,Magnetoresistance in multilayer fullerene spin valves: a first-principles study,"Carbon-based molecular semiconductors are explored for application in
+spintronics because their small spin-orbit coupling promises long spin life
+times. We calculate the electronic transport from first principles through spin
+valves comprising bi- and tri-layers of the fullerene molecules C60 and C70,
+sandwiched between two Fe electrodes. The spin polarization of the current, and
+the magnetoresistance depend sensitively on the interactions at the interfaces
+between the molecules and the metal surfaces. They are much less affected by
+the thickness of the molecular layers. A high current polarization (CP > 90%)
+and magnetoresistance (MR > 100%) at small bias can be attained using C70
+layers. In contrast, the current polarization and the magnetoresistance at
+small bias are vanishingly small for C60 layers. Exploiting a generalized
+Julli`ere model we can trace the differences in spin-dependent transport
+between C60 and C70 layers to differences between the molecule-metal interface
+states. These states also allow one to interpret the current polarization and
+the magnetoresistance as a function of the applied bias voltage.",1410.7344v1
+2015-02-12,Unusual spin dynamics in topological insulators,"The dynamic spin susceptibility (DSS) has a ubiquitous Lorentzian form in
+conventional materials with weak spin orbit coupling, whose spectral width
+characterizes the spin relaxation rate. We show that DSS has an unusual
+non-Lorentzian form in topological insulators, which are characterized by
+strong SOC. At zero temperature, the high frequency part of DSS is universal
+and increases in certain directions as $\omega^{d-1}$ with $d=2$ and 3 for
+surface states and Weyl semimetals, respectively, while for helical edge
+states, the interactions renormalize the exponent as $d=2K-1$ with $K$ the
+Luttinger-liquid parameter. As a result, spin relaxation rate cannot be deduced
+from the DSS in contrast to the case of usual metals, which follows from the
+strongly entangled spin and charge degrees of freedom in these systems. These
+parallel with the optical conductivity of neutral graphene.",1502.03680v1
+2015-04-16,Thermoelectric and thermospin transport in a ballistic junction of graphene,"We consider theoretically a wide graphene ribbon, that on both ends is
+attached to electronic reservoirs which generally have different temperatures.
+The graphene ribbon is assumed to be deposited on a substrate, that leads to a
+spin-orbit coupling of Rashba type. We calculate the thermally induced charge
+current in the ballistic transport regime as well as the thermoelectric voltage
+(Seebeck effect). Apart from this, we also consider thermally induced spin
+current and spin polarization of the graphene ribbon. The spin currents are
+shown to have generally two components; one parallel to the temperature
+gradient and the other one perpendicular to this gradient. The latter
+corresponds to the spin current due to the spin Nernst effect. Additionally, we
+also consider the heat current between the reservoirs due to transfer of
+electrons.",1504.04265v1
+2015-05-22,Symmetry induced hole-spin mixing in quantum dot molecules,"We investigate theoretically the spin purity of single holes confined in
+vertically coupled GaAs/AlGaAs quantum dots (QDs) under longitudinal magnetic
+fields. A unique behavior is observed for triangular QDs, by which the spin is
+largely pure when the hole is in one of the dots, but it becomes strongly mixed
+when an electric field is used to drive it into molecular resonance. The spin
+admixture is due to the valence band spin-orbit interaction, which is greatly
+enhanced in C3h symmetry environments. The strong yet reversible electrical
+control of hole spin suggests that molecules with C3-symmetry QDs, like those
+obtained with [111] growth, can outperform the usual C2-symmetry QDs obtained
+with [001] growth for the development of scalable qubit architectures.",1505.06009v2
+2015-10-21,Ising Superconductivity and Majorana Fermions in Transition Metal Dichalcogenides,"In monolayer transition metal dichalcogenides (TMDs), electrons in opposite
+$K$ valleys are subject to opposite effective Zeeman fields, which are referred
+to as Ising spin-orbit coupling (SOC) fields. The Ising SOC, originated from
+in-plane mirror symmetry breaking pins the electron spins in out-of-plane
+directions, and results in the newly discovered Ising superconducting states
+with strongly enhanced upper critical fields. In this work, we show that the
+Ising SOC generates equal-spin triplet Cooper pairs with spin polarization in
+the in-plane directions. Importantly, the spin-triplet Cooper pairs can induce
+superconducting pairings in a half-metal wire placed on top of the TMD and
+result in a topological superconductor with Majorana end states. Direct ways to
+detect equal-spin triplet Cooper pairs and the differences between Ising
+superconductors and Rashba superconductors are discussed.",1510.06289v4
+2016-01-25,"Fermi surfaces, spin-mixing parameter, and colossal anisotropy of spin relaxation in transition metals from ab initio theory","The Fermi-surfaces and Elliott-Yafet spin-mixing parameter (EYP) of several
+elemental metals are studied by \emph{ab initio} calculations. We focus first
+on the anisotropy of the EYP as a function of the direction of the
+spin-quantization axis [Phys.~Rev.~Lett.\ \textbf{109}, 236603 (2012)]. We
+analyze in detail the origin of the gigantic anisotropy in $5d$ hcp metals as
+compared to $5d$ cubic metals by band-structure calculations and discuss the
+stability of our results against an applied magnetic field. We further present
+calculations of light (4$d$ and 3$d$) hcp crystals, where we find a huge
+increase of the EYP anisotropy, reaching colossal values as large as $6000\%$
+in hcp Ti. We attribute these findings to the reduced strength of spin-orbit
+coupling, which promotes the anisotropic spin-flip hot loops at the Fermi
+surface.
+  In order to conduct these investigations, we developed an adapted
+tetrahedron-based method for the precise calculation of Fermi surfaces of
+complicated shape and accurate Fermi-surface integrals within the
+full-potential relativistic Korringa-Kohn-Rostoker Green-function method.",1601.06605v1
+2016-06-07,Photo-modulation of the spin Hall conductivity of mono-layer transition metal dichalcogenides,"We report on a possible optical tuning of the spin Hall conductivity in
+mono-layer transition metal dichalcogenides. Light beams of frequencies much
+higher than the energy scale of the system (the \textit{off-resonant}
+condition) does not excite electrons but rearranges the band structure. The
+rearrangement is quantitatively established using the Floquet formalism. For
+such a system of mono-layer transition metal dichalcogenides, the spin Hall
+conductivity (calculated with the Kubo expression in presence of disorder)
+exhibits a drop at higher frequencies and lower intensities. Finally, we
+compare the spin Hall conductivity of the higher spin-orbit coupled WSe$_{2} $
+to MoS$_{2} $; the spin Hall conductivity of WSe$_{2}$ was found to be larger.",1606.02089v1
+2016-09-29,Rattleback: a model of how geometric singularity induces dynamic chirality,"The rattleback is a boat-shaped top with an asymmetric preference in spin.
+Its dynamics can be described by nonlinearly coupled pitching, rolling, and
+spinning modes. The chirality, designed into the body as a skewed mass
+distribution, manifests itself in the quicker transition of $+$spin
+$\rightarrow$ pitch $\rightarrow$ $-$spin than that of $-$spin $\rightarrow$
+roll $\rightarrow$ $+$spin. The curious guiding idea of this work is that we
+can formulate the dynamics as if a symmetric body were moving in a chiral
+space. By elucidating the duality of matter and space in the Hamiltonian
+formalism, we attribute asymmetry to space. The rattleback is shown to live in
+the space dictated by the Bianchi type ${\rm VI}_{h < -1}$ (belonging to class
+B) algebra; this particular algebra is used here for the first time in a
+mechanical example. The class B algebra has a singularity that separates the
+space (Poisson manifold) into mirror-asymmetric subspaces, breaking the
+time-reversal symmetry of nearby orbits.",1609.09223v2
+2017-03-30,Study of spin pumping in Co thin film vis-a-vis seed and capping layer using ferromagnetic resonance spectroscopy,"We investigated the dependence of the seed [Ta/Pt, Ta/Au] and capping [Pt/Ta,
+Au/Ta] layers on spin pumping effect in the ferromagnetic 3 nm thick Co thin
+film using ferromagnetic resonance spectroscopy. The data is fitted with Kittel
+equation to evaluate damping constant and g-factor. A strong dependence of seed
+and capping layers on spin pumping has been discussed. The value of damping
+constant {alpha} is found to be relatively large i.e. 0.0326 for the
+Ta{3}/Pt{3}/Co{3}/Pt{3}/Ta{3} {nm} multi-layer structure, while it is 0.0104
+for Ta{3}/Co{3}/Ta{3} {nm}. Increase in {alpha} is observed due to Pt layer
+that works as a good sink for spins due to high spin orbit coupling. In
+addition, we measured the effective spin conductance = 2.0e18 m-2 for the
+trilayer structure Pt{3}/Co{3}/Pt{3} {nm} as a result of the enhancement in
+{alpha} relative to its bulk value. We observed that the evaluated g-factor
+decreases as effective demagnetizing magnetic field increases in all the
+studied samples. The azimuthal dependence of magnetic resonance field and line
+width showed relatively high anisotropy in the trilayer Ta{3}/Co{3}/Ta{3} {nm}
+structure.",1703.10630v1
+2013-08-14,Hubbard Model on the Pyrochlore Lattice: a 3D Quantum Spin Liquid,"We demonstrate that the insulating one-band Hubbard model on the pyrochlore
+lattice contains, for realistic parameters, an extended quantum spin-liquid
+phase. This is a three-dimensional spin liquid formed from a highly degenerate
+manifold of dimer-based states, which is a subset of the classical dimer
+coverings obeying the ice rules. It possesses spinon excitations, which are
+both massive and deconfined, and on doping it exhibits spin-charge separation.
+We discuss the realization of this state in effective S = 1/2 pyrochlore
+materials with and without spin-orbit coupling.",1308.3186v3
+2014-03-16,Subband anticrossing and the spin Hall effect in quantum wires,"We report on numerical simulations of the intrinsic spin Hall effect in
+semiconductor quantum wires as a function of the Rashba spin-orbit coupling
+strength, the electron density, and the width of the wire. We find that the
+strength of the spin Hall effect does not depend monotonically on these
+parameters, but instead exhibits a local maximum. This behavior is explained by
+considering the dispersion relation of the electrons in the wire, which is
+characterized by the anticrossing of adjacent subbands. These results lead to a
+simple estimate of the optimal wire width for spin Hall transport experiments,
+and simulations indicate that this optimal width is independent of disorder.
+The anticrossing of adjacent subbands is related to a quantum phase transition
+in momentum space, and is accompanied by an enhancement of the Berry curvature
+and subsequently in the magnitude of the spin Hall effect.",1403.3940v1
+2016-11-28,Nuclear scissors modes and hidden angular momenta,"The coupled dynamics of low lying modes and various giant resonances are
+studied with the help of the Wigner Function Moments method generalized to take
+into account spin degrees of freedom and pair correlations simultaneously. The
+method is based on Time Dependent Hartree-Fock-Bogoliubov equations. The model
+of the harmonic oscillator including spin-orbit potential plus
+quadrupole-quadrupole and spin-spin interactions is considered. New low lying
+spin dependent modes are analyzed. Special attention is paid to the scissors
+modes. A new source of nuclear magnetism, connected with counter-rotation of
+spins up and down around the symmetry axis (hidden angular momenta), is
+discovered. Its inclusion into the theory allows one to improve substantially
+the agreement with experimental data in the description of energies and
+transition probabilities of scissors modes.",1611.09037v1
+2017-06-06,Spinon magnetic resonance of quantum spin liquids,"We describe electron spin resonance in a quantum spin liquid with significant
+spin-orbit coupling. We find that the resonance directly probes spinon
+continuum which makes it an efficient and informative probe of exotic
+excitations of the spin liquid. Specifically, we consider spinon resonance of
+three different spinon mean-field Hamiltonians, obtained with the help of
+projective symmetry group analysis, which model a putative quantum spin liquid
+state of the triangular rare-earth antiferromagnet YbMgGaO4. The band of
+absorption is found to be very broad and exhibit strong van Hove singularities
+of single spinon spectrum as well as pronounced polarization dependence.",1706.01597v2
+2017-10-18,Selective equal spin Andreev reflection at vortex core center in magnetic semiconductor-superconductor heterostructure,"Sau, Lutchyn, Tewari and Das Sarma (SLTD) proposed a heterostructure
+consisting of a semiconducting thin film sandwiched between an s-wave
+superconductor and a magnetic insulator and showed possible Majorana zero mode.
+Here we study spin polarization of the vortex core states and spin selective
+Andreev reflection at the vortex center of the SLTD model. In the topological
+phase, the differential conductance at the vortex center contributed from the
+Andreev reflection, is spin selective and has a quantized value
+$(dI/dV)^{topo}_A =2e^2/h$ at zero bias. In the topological trivial phase,
+$(dI/dV)^{trivial}_A$ at the lowest quasiparticle energy of the vortex core is
+spin selective due to the spin-orbit coupling (SOC). Unlike in the topological
+phase, $(dI/dV)^{trivial}_A$ is suppressed in the Giaever limit and vanishes
+exactly at zero bias due to the quantum destruction interference.",1710.06625v1
+2018-01-31,Spin susceptibility of three-dimensional Dirac semimetals,"We theoretically study the spin susceptibility of Dirac semimetals using the
+linear response theory. The spin susceptibility is decomposed into an intraband
+contribution and an interband contribution. We obtain analytical expressions
+for the intraband and interband contributions of massless Dirac fermions. The
+spin susceptibility is independent of the Fermi energy while it depends on the
+cutoff energy, which is introduced to regularize the integration. We find that
+the cutoff energy is appropriately determined by comparing the results for the
+Wilson-Dirac lattice model, which approximates the massless Dirac Hamiltonian
+around the Dirac point. We also calculate the spin susceptibility of massive
+Dirac fermions for the model of topological insulators. We discuss the effect
+of the band inversion and the strength of spin-orbit coupling.",1801.10397v2
+2018-01-31,Kramers' revenge,"The combination of space inversion and time reversal symmetries result in
+doubly-degenerate Bloch states with opposite spin. Many lattices with these
+symmetries can be constructed by combining a noncentrosymmetric potential
+(lacking this degeneracy) with its inverted copy. Using simple models, we
+unravel the evolution of local spin-splitting during this process of inversion
+symmetry restoration, in the presence of spin-orbit interaction and sublattice
+coupling. Importantly, through an analysis of quantum mechanical commutativity,
+we examine the difficulty of identifying states that are simultaneously
+spatially segregated and spin polarized. We also explain how experimental
+probes (such as angle-resolved photoemission spectroscopy, or ARPES) of `hidden
+spin polarization' in layered materials are susceptible to unrelated spin
+splitting intrinsically induced by broken inversion symmetry at the surface.",1801.10581v2
+2020-01-15,Evolution of valence-specific spin states and local distortions in La$_{2-x}$Sr$_x$CoO$_4$,"We present X-ray spectroscopic evidence for the evolution of valence-specific
+spin states and tetragonal distortions in single-layer cobaltates. Measurements
+of Co $L_3$-edge resonant inelastic X-ray scattering reveal the $t_{2g}$
+electronic structure of Co for hole-doped La$_{2-x}$Sr$_x$CoO$_4$ ($x$ = 0.5,
+0.7 and 0.8). As the Sr-doping $x$ increases, the tetragonal splitting of the
+$t_{2g}$ states of high-spin Co$^{2+}$ decreases, whereas that of low-spin
+Co$^{3+}$ increases and the fraction of high-spin Co$^{3+}$ increases. The
+results enable us to clarify the origin of the change of magnetic anisotropy
+and in-plane resistivity in a mixed-valence cobaltate caused by the interplay
+of spin-orbit coupling and tetragonal distortion.",2001.05194v3
+2017-09-29,Photo-induced spin and valley-dependent Seebeck effect in the low-buckled Dirac materials,"Employing the Landauer-Buttiker formula we investigate the spin and valley
+dependence of Seebeck effect in low-buckled Dirac materials (LBDMs), whose band
+structure are modulated by local application of a gate voltage and off-resonant
+circularly polarized light. We calculate the charge, spin and valley Seebeck
+coefficients of an irradiated LBDM as functions of electronic doping, light
+intensity and the amount of the electric field in the linear regime. Our
+calculation reveal that all Seebeck coefficients always shows an odd features
+with respect to the chemical potential. Moreover, we show that, due to the
+strong spin-orbit coupling in the LBDMs, the induced thermovoltage in the
+irradiated LBDMs is spin polarized, and can also become valley polarized if the
+gate voltage is applied too. It is also found that the valley (spin)
+polarization of the induced thermovoltage could be inverted by reversing the
+circular polarization of light or reversing the direction the electric field
+(only by reversing the circular polarization of light).",1709.10357v1
+2019-02-14,Coupled dynamics of long-range and internal spin cluster order in Cu$_{2}$OSeO$_{3}$,"Cu$_4$ triplet clusters form the relevant spin entity for the formation of
+long-range magnetic order in the cluster magnet Cu$_2$OSeO$_3$. Using
+time-resolved Raman spectroscopy, we probed photoinduced spin and lattice
+dynamics in this Mott insulator. Multiple ps-decade spin-lattice relaxation
+dynamics is observed, evidencing a separation of the order parameter dynamics
+into disordering of long-range and internal spin cluster order. Our study
+exemplifies the double order parameter dynamics of generalized molecular
+crystals of charge, spin, and orbital nature.",1902.05329v1
+2018-10-22,Controlled engineering of spin polarized transport properties in a zigzag graphene nanojunction,"We investigate a novel way to manipulate the spin polarized transmission in a
+two terminal zigzag graphene nanoribbon in presence of Rashba spin-orbit (SO)
+interaction with circular shaped cavity engraved into it. A usual technique to
+control the spin polarized transport behaviour of a nanoribbon can be achieved
+by tuning the strength of the SO coupling, while we show that an efficient
+engineering of the spin polarized transport properties can also be done via
+cavities of different radii engraved in the nanoribbon. Simplicity of the
+technique in creating such cavities in the experiments renders an additional
+handle to explore transport properties as a function of the location of the
+cavity in the nanoribbon. Further, a systematic assessment of the interplay of
+the Rashba interaction and the dimensions of the nanoribbon is presented. These
+results should provide useful input to the spintronic behaviour of such
+devices. In addition to the spin polarization, we have also included an
+interesting discussion on the charge transmission properties of the nanoribbon,
+where, in absence of any SO interaction a metal-insulator transition induced by
+the presence of a cavity is observed.",1810.09088v1
+2020-06-16,Gate tunability of highly efficient spin-to-charge conversion by spin Hall effect in graphene proximitized with WSe$_2$,"The proximity effect opens ways to transfer properties from one material into
+another and is especially important in two-dimensional materials. In van der
+Waals heterostructures, transition metal dichalcogenides (TMD) can be used to
+enhance the spin-orbit coupling of graphene leading to the prediction of gate
+controllable spin-to-charge conversion (SCC). Here, we report for the first
+time and quantify the SHE in graphene proximitized with WSe$_2$ up to room
+temperature. Unlike in other graphene/TMD devices, the sole SCC mechanism is
+the spin Hall effect and no Rashba-Edelstein effect is observed. Importantly,
+we are able to control the SCC by applying a gate voltage. The SCC shows a high
+efficiency, measured with an unprecedented SCC length larger than 20 nm. These
+results show the capability of two-dimensional materials to advance towards the
+implementation of novel spin-based devices and future applications.",2006.09227v1
+2021-09-27,Spin Texture as Polarization Fingerprint of Halide Perovskites,"Halide perovskites are perceived to be the promising class of materials for
+optoelectronics, spinorbitronics and topological electronics due to presence of
+strong spin-orbit coupling and polarized field. Here, we develop a Hamiltonian
+using quasi-degenerate perturbation theory to describe polarized field driven
+band structures and unique topological phases such as Dirac semimetallic rings
+for the universal class of Halide perovskites including both inorganic and
+hybrid members. The spin textures obtained through this theoretical model
+captures minute effects of polarization and hence can be used as a modern tool
+to determine the polarized field directions which have significant influence on
+spinorbitronics. The analysis brings out the concepts of hybrid spin textures
+intermixing the effects of valence and conduction bands under topological
+quantum phase transitions, and spin texture binaries where alignment of the
+spins are reversed between domains in the momentum space with sharp boundaries.
+The results are validated through density functional calculations.",2109.13195v2
+2021-10-22,"Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr$_2$IrO$_4$","Protected by the interplay of on-site Coulomb interactions and spin-orbit
+coupling, Sr$_2$IrO$_4$ at high pressure is a rare example of a Mott insulator
+with a paramagnetic ground state. Here, using optical Raman scattering, we
+measure both the phonon and magnon evolution in Sr$_2$IrO$_4$ under pressure,
+and identify three different magnetically-ordered phases, culminating in a
+spin-disordered state beyond 18 GPa. A strong first-order structural phase
+transition drives the magnetic evolution at $\sim$10 GPa with reduced
+structural anisotropy in the IrO$_6$ cages, leading to increasingly isotropic
+exchange interactions between the Heisenberg spins and a spin-flip transition
+to $c$-axis-aligned antiferromagnetic order. In the disordered phase of
+Heisenberg $J_\mathrm{eff}=1/2$ pseudospins, the spin excitations are
+quasi-elastic and continuous to 10 meV, potentially hosting a gapless quantum
+spin liquid in Sr$_2$IrO$_4$.",2110.11588v1
+2021-12-14,"Electrical detection of the spin-flop and room-temperature magnetic ordering in van der Waals CrPS$_{4}$/(Pt, Pd) heterostructures","We study magneto-transport in heterostructures composed of the van der Waals
+antiferromagnet CrPS$_{4}$ and the heavy metals Pt and Pd. The transverse
+resistance (R$_{xy}$) signal reveals the spin-flop transition of CrPS$_{4}$ and
+a strongly enhanced magnetic ordering temperature (>300 K), which might
+originate from a strong spin-orbit coupling at the interface. While
+CrPS$_{4}$/Pt devices allow for easy detection of the spin-flop transition,
+CrPS$_{4}$/Pd devices show a more substantial enhancement in magnetic ordering
+temperature and exhibit a topological Hall effect signal, possibly related to
+chiral spin structures at the interface. The longitudinal magnetoresistance
+(R$_{xx}$) results from a combination of spin-Hall magnetoresistance and the
+negative magnetoresistance that can be explained by a field-induced change of
+the electronic band structure of CrPS$_{4}$.",2112.07306v1
+2022-05-31,Spin field-effect transistors based on massless birefringent Dirac fermions in polar Dirac semimetals,"The Datta-Das-type spin field-effect transistor, using a two-dimensional
+electron gas in a semiconductor heterostructure as a channel, plays a key role
+in spintronics. Here, we theoretically present a type of spin field-effect
+transistor based on massless birefringent Dirac fermions in polar Dirac
+semimetals. The manipulation of spin arises from the existence of the strong
+spin-orbit coupling, polar space groups, and Dirac cones in a single phase. The
+oscillatory channel conductance can be controlled by the sign of gate voltage
+in addition to its magnitude due to the gapless band structures of polar Dirac
+semimetals. Such spin field-effect transistor provides guidance for the further
+design of spintronic devices.",2205.15847v1
+2022-08-08,Spin Hall conductivity of interacting two-dimensional electron systems,"We consider a two-dimensional electron system subjected to a short-ranged
+nonmagnetic disorder potential, Coulomb interactions, and Rashba spin-orbit
+coupling. The path-integral approach incorporated within the Keldysh formalism
+is used to derive the kinetic equation for the semiclassical Green's function
+and applied to compute the spin current within the linear response theory. We
+discuss the frequency dependence of the spin Hall conductivity and further
+elucidate the role of electron interactions at finite temperatures for both the
+ballistic and diffusive regimes of transport. We argue that interaction
+corrections to the spin Hall effect stem from the quantum interference
+processes whose magnitude is estimated in terms of parameters of the considered
+model.",2208.03888v2
+2022-09-20,Calculating interface transport parameters at finite temperatures: Nonmagnetic interfaces,"First-principles scattering calculations are used to investigate spin
+transport through interfaces between diffusive nonmagnetic metals where the
+symmetry lowering leads to an enhancement of the effect of spin-orbit coupling
+(SOC) and to a discontinuity of the spin currents passing through the
+interfaces. From the conductance and local spin currents calculated for
+nonmagnetic bilayers, we extract values of the room temperature interface
+resistance $R_{\rm I}$, of the spin memory loss parameter $\delta$ and of the
+interface spin Hall angle $\Theta_{\rm I}$ for nonmagnetic Au$|$Pt and Au$|$Pd
+interfaces using a frozen thermal disorder scheme to model finite temperatures.
+Substantial values of all three parameters are found with important
+consequences for experiments involving nonmagnetic spacer and capping layers.
+The temperature dependence of the interface parameters is determined for
+Au$|$Pt.",2209.09885v1
+2023-03-06,Phase driving hole spin qubits,"The spin-orbit interaction in spin qubits enables spin-flip transitions,
+resulting in Rabi oscillations when an external microwave field is resonant
+with the qubit frequency. Here, we introduce an alternative driving mechanism
+of hole spin qubits, where a far-detuned oscillating field couples to the qubit
+phase. Phase driving at radio frequencies, orders of magnitude slower than the
+microwave qubit frequency, induces highly non-trivial spin dynamics, violating
+the Rabi resonance condition. By using a qubit integrated in a silicon fin
+field-effect transistor (Si FinFET), we demonstrate a controllable suppression
+of resonant Rabi oscillations, and their revivals at tunable sidebands. These
+sidebands enable alternative qubit control schemes using global fields and
+local far-detuned pulses, facilitating the design of dense large-scale qubit
+architectures with local qubit addressability. Phase driving also decouples
+Rabi oscillations from noise, an effect due to a gapped Floquet spectrum and
+can enable Floquet engineering high-fidelity gates in future quantum
+processors.",2303.03350v1
+2023-06-05,Critical Phenomena Study of 3D Heisenberg Magnet,"Recent discovery of several van der waals magnetic material and moire magnet
+introduce to us an extremely challenging and revolutionary era of 2D magnetism
+and correlated phenomena for low dimensional material.More often the simplest
+spin models which is based on inter-atomic exchange and spin-orbit
+coupling(SOC) potentially able to capture and explain the critical phenomena of
+extremely complicated correlated magnetic material.In this work we have
+attempted to simulate 3D Heisenberg magnet using classical Monte Carlo
+simulation.Our goal is to establish a new and simplest spin simulation
+technique which can help us to understand those van der waals magnet from its
+microscopic length scale.Here we have been proposing a completely new
+methodology of classical Monte Carlo simulation of Heisenberg spin which is
+based on single spin flipping Metropolis algorithm.Our state of art simulation
+technique potentially able to study the phase transition of isotropic XY(O(2))
+and XYZ(O(3))spin model very efficiently.With this simulation technique we
+overcome the barrier of critical slowing down during the phase transition in a
+effective way and able to predict the transition temperature($T_c$) very
+accurately.",2306.02566v1
+2023-08-04,Anisotropy of the spin Hall effect in a Dirac ferromagnet,"We study the intrinsic spin Hall effect of a Dirac Hamiltonian system with
+ferromagnetic exchange coupling, a minimal model combining relativistic
+spin-orbit interaction and ferromagnetism. The energy bands of the Dirac
+Hamiltonian are split after introducing a Stoner-type ferromagnetic ordering
+which breaks the spherical symmetry of pristine Dirac model. The totally
+antisymmetric spin Hall conductivity (SHC) tensor becomes axially anisotropic
+along the direction of external electric field. Interestingly, the anisotropy
+does not vanish in the asymptotic limit of zero magnetization. We show that the
+ferromagnetic ordering breaks the spin degeneracy of the eigenfunctions and
+modifies the selection rules of the interband transitions for the intrinsic
+spin Hall effect. The difference in the selection rule between the pristine and
+the ferromagnetic Dirac phases causes the anisotropy of the SHC, resulting in a
+discontinuity of the SHC as the magnetization, directed orthogonal to the
+electric field, is reduced to zero in the ferromagnetic Dirac phase and enters
+the pristine Dirac phase.",2308.02336v1
+2023-08-27,How to produce spin-splitting in antiferromagnetic materials,"Antiferromagnetic (AFM) materials have potential advantages for spintronics
+due to their robustness, ultrafast dynamics, and magnetotransport effects.
+However, the missing spontaneous polarization and magnetization hinders the
+efficient utilization of electronic spin in these AFM materials. Here, we
+propose a simple way to produce spin-splitting in AFM materials by making the
+magnetic atoms with opposite spin polarization locating in the different
+environment (surrounding atomic arrangement), which does not necessarily
+require the presence of spin-orbital coupling (SOC). We confirm our proposal by
+four different types of two-dimensional (2D) AFM materials within the
+first-principles calculations. Our works provide a intuitional design principle
+to find or produce spin-splitting in AFM materials.",2308.14097v1
+2023-09-21,Superfluidity of Total Angular Momentum,"Spontaneous symmetry breaking of a U(1) symmetry leads to superfluidity of a
+corresponding conserved charge. We generalize the superfluidity to systems with
+U(1) symmetries acting on both matter fields and two-dimensional spatial
+coordinates. Such systems can be effectively realized in easy-plane
+ferromagnetic systems with spin-orbit coupling where the conserved charge is a
+total angular momentum. We clarify that under a steady injection of spin
+angular momentum, the superfluid of the total angular momentum shows spacetime
+oscillations of the spin density and geometry-dependent spin hydrodynamics. We
+also demonstrate that the steady spin injection destabilizes the superfluid of
+total angular momentum, causing a dissipation effect in its spin hydrodynamic
+properties. Our study broadens the comprehension of superfluidity and sheds new
+light on the interplay between symmetries and phases of matter.",2309.12068v2
+2023-10-17,Altermagnetic Schottky Contact,"Altermagnet is an emerging antiferromagnetic material subclass that exhibits
+spin-splitting in momentum space without net global magnetization and
+spin-orbit-coupling effect. In this work, we develop a model of thermal charge
+injection across an altermagnet/semiconductor (AM/S) Schottky contact. We
+obtain analytical expressions describing the spin-dependent thermionic current
+injection across the AM/S contact under any arbitrary interface orientation
+angles. Interestingly, the spin-contrasting Fermi surface of an altermagnetic
+electrode enables spin-polarized current to be injected into a nonmagnetic
+semiconductor even though the system has net-zero magnetization. Our findings
+thus reveal an altermagntic mechanism to achieve spin injection without
+involving ferromagnetic ordering. The AM/S Schottky contact proposed here shall
+provide a potential altermagnetic building block of spintronic devices that are
+resilient against stray magnetic field perturbation and inherently compatible
+with ultracompact integration.",2310.11289v1
+2024-01-15,Theoretical Design of Mono-Elemental Ferroelectricity with Tunable Spin Textures in Bilayer Tellurium,"2D Ferroelectricity with switchable electric polarization has drawn
+widespread attention in condensed matter physics due to its crucial
+applications in non-volatile memory and ferroelectric spin devices. Despite
+recent progress in 2D ferroelectric, achieving the mono-elemental
+ferroelectricity still remains a great challenge because most nonmetallic
+mono-elemental materials are stabilized in nonpolar crystal structures. In this
+work, we theoretically designed mono-elemental ferroelectricity with tunable
+and significant spin textures in bilayer tellurium (BL-Te). Comprehensive
+quantitative polarization calculations demonstrate that asymmetric stacking in
+BL-Te can generate out-of-plane (OOP) polarization with a magnitude of 0.78
+pC/m. This polarization stems from distinguishing interlayer and intra-layer
+contributions. Moreover, these stacked BL-Te, characterized by significant
+spin-orbit coupling, serve as an ideal platform for investigating both
+conventional spin polarization and layer-dependent/hidden spin polarization
+through ferroelectric reversion. Our work not only broaden the category of 2D
+mono-elemental ferroelectric but also offer a new platform for multifunctional
+nanodevices.",2401.07752v1
+2005-03-16,"Disorder, spin-orbit, and interaction effects in dilute ${\rm Ga}_{1-x}{\rm Mn}_x{\rm As}$","We derive an effective Hamiltonian for ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ in
+the dilute limit, where ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ can be described in
+terms of spin $F=3/2$ polarons hopping between the {\rm Mn} sites and coupled
+to the local {\rm Mn} spins. We determine the parameters of our model from
+microscopic calculations using both a variational method and an exact
+diagonalization within the so-called spherical approximation. Our approach
+treats the extremely large Coulomb interaction in a non-perturbative way, and
+captures the effects of strong spin-orbit coupling and Mn positional disorder.
+We study the effective Hamiltonian in a mean field and variational calculation,
+including the effects of interactions between the holes at both zero and finite
+temperature. We study the resulting magnetic properties, such as the
+magnetization and spin disorder manifest in the generically non-collinear
+magnetic state. We find a well formed impurity band fairly well separated from
+the valence band up to $x_{\rm active} \lesssim 0.015$ for which finite size
+scaling studies of the participation ratios indicate a localization transition,
+even in the presence of strong on-site interactions, where $x_{\rm
+active}<x_{\rm nom}$ is the fraction of magnetically active Mn. We study the
+localization transition as a function of hole concentration, Mn positional
+disorder, and interaction strength between the holes.",0503382v1
+2006-05-18,Transport properties for a Luttinger liquid wire with Rashba spin-orbit coupling and Zeeman splitting,"We study the transport properties for a Luttinger-liquid (LL) quantum wire in
+the presence of both Rashba spin-orbit coupling (SOC) and a weak external
+in-plane magnetic field. The bosonized Hamiltonian of the system with an
+externally applied longitudinal electric field is established. And then the
+equations of motion for the bosonic phase fields are solved in the Fourier
+space, with which the both charge and spin conductivities for the system are
+calculated analytically based on the linear response theory. Generally, the ac
+conductivity is an oscillation function of the strengths of electron-electron
+interaction, Rashba SOC and magnetic field, as well as the driving frequency
+and the measurement position in the wire. Through analysis with some examples
+it is demonstrated that the modification on the conductivity due to
+electron-electron interactions is more remarkable than that due to SOC, while
+the effects of SOC and Zeeman splitting on the conductivity are very similar.
+The spin-polarized conductivities for the system in the absence of Zeeman
+effect or SOC are also discussed, respectively. The ratio of the spin-polarized
+conductivities $\sigma_\uparrow/\sigma_\downarrow$ is dependent of the
+electron-electron interactions for the system without SOC, while it is
+independent of the electron-electron interactions for the system without Zeeman
+splitting.",0605450v2
+2008-09-04,Aharonov-Casher and spin Hall effects in two-dimensional mesoscopic ring structures with strong spin-orbit interaction,"We study the quantum interference effects induced by the Aharonov-Casher
+phase in asymmetrically confined two-dimensional electron and heavy-hole ring
+structures systems taking into account the electrically tunable spin-orbit (SO)
+interaction. We have calculated the non-adiabatic transport properties of
+charges (heavy-holes and electrons) in two-probe thin ring structures and
+compare how the form of the SO coupling of the carries affects it. We show that
+both the SO splitting of the bands and the carrier density can be used to
+modulate the conductance through the ring. We show that the dependence on
+carrier density is due to the backscattering from the leads which shows
+pronounce resonances when the Fermi energy is close to the eigenenergy of the
+ring. We also calculate the spin Hall conductivity and longitudinal
+conductivity in four-probe rings as a function of the carrier density and SO
+interaction, demonstrating that for heavy-hole carriers both conductivities are
+larger than for electrons. Finally, we investigate the transport properties of
+mesoscopic rings with spatially inhomogeneous SO coupling. We show that devices
+with inhomogeneous SO interaction exhibit an electrically controlled
+spin-flipping mechanism.",0809.0880v1
+2010-06-01,Double Quantum Dots in Carbon Nanotubes,"We study the two-electron eigenspectrum of a carbon-nanotube double quantum
+dot with spin-orbit coupling. Exact calculation are combined with a simple
+model to provide an intuitive and accurate description of single-particle and
+interaction effects. For symmetric dots and weak magnetic fields, the
+two-electron ground state is antisymmetric in the spin-valley degree of freedom
+and is not a pure spin-singlet state. When double occupation of one dot is
+favored by increasing the detuning between the dots, the Coulomb interaction
+causes strong correlation effects realized by higher orbital-level mixing.
+Changes in the double-dot configuration affect the relative strength of the
+electron-electron interactions and can lead to different ground state
+transitions. In particular, they can favor a ferromagnetic ground state both in
+spin and valley degrees of freedom. The strong suppression of the energy gap
+can cause the disappearance of the Pauli blockade in transport experiments and
+thereby can also limit the stability of spin-qubits in quantum information
+proposals. Our analysis is generalized to an array of coupled dots which is
+expected to exhibit rich many-body behavior.",1006.0209v2
+2014-07-25,Low temperature magnetic properties of NpNi$_5$,"We present the result of an extended experimental characterization of the
+hexagonal intermetallic Haucke compound NpNi$_{5}$. By combining macroscopic
+and shell-specific techniques, we determine the 5$f$-shell occupation number
+$n_f$ close to 4 for the Np ions, together with orbital and spin components of
+the ordered moment in the ferromagnetic phase below T$_C$ = 16 K ($\mu_{S}$ =
+-1.88~$\mu_{B}$ and $\mu_{L}$ = 3.91~$\mu_{B}$). The apparent coexistence of
+ordered and disordered phases observed in the M\""{o}ssbauer spectra is
+explained in terms of slow relaxation between the components of a quasi-triplet
+ground state. The ratio between the expectation value of the magnetic dipole
+operator and the spin magnetic moment ($3\langle T_{z}\rangle/ \langle
+S_{z}\rangle$ = +1.43) is positive and large, suggesting a localized character
+of the 5$f$ electrons. The angular part of the spin-orbit coupling
+($\langle\vec{\ell}\cdot\vec{s}\rangle$ = -5.55) is close to the value of -6.25
+calculated for trivalent Np ions in intermediate coupling approximation. The
+results are discussed against the prediction of first-principle electronic
+structure calculations based on the spin-polarized local spin density
+approximation plus Hubbard interaction, and of a mean field model taking into
+account crystal field and exchange interactions.",1407.6825v1
+2014-09-24,Functional renormalization and mean-field approach to multiband systems with spin-orbit coupling: Application to the Rashba model with attractive interaction,"The functional renormalization group (RG) in combination with Fermi surface
+patching is a well-established method for studying Fermi liquid instabilities
+of correlated electron systems. In this article, we further develop this method
+and combine it with mean-field theory to approach multiband systems with
+spin-orbit coupling, and we apply this to a tight-binding Rashba model with an
+attractive, local interaction. The spin dependence of the interaction vertex is
+fully implemented in a RG flow without SU(2) symmetry, and its momentum
+dependence is approximated in a refined projection scheme. In particular, we
+discuss the necessity of including in the RG flow contributions from both bands
+of the model, even if they are not intersected by the Fermi level. As the
+leading instability of the Rashba model, we find a superconducting phase with a
+singlet-type interaction between electrons with opposite momenta. While the gap
+function has a singlet spin structure, the order parameter indicates an
+unconventional superconducting phase, with the ratio between singlet and
+triplet amplitudes being plus or minus one on the Fermi lines of the upper or
+lower band, respectively. We expect our combined functional RG and mean-field
+approach to be useful for an unbiased theoretical description of the
+low-temperature properties of spin-based materials.",1409.7087v4
+2015-01-17,Superfluidity of Bose-Einstein condensates in ultracold atomic gases,"Liquid helium 4 had been the only bosonic superfluid available in experiments
+for a long time. This situation was changed in 1995, when a new superfluid was
+born with the realization of the Bose-Einstein condensation in ultracold atomic
+gases. The liquid helium 4 is strongly interacting and has no spin; there is
+almost no way to change its parameters, such as interaction strength and
+density. The new superfluid, Bose-Einstein condensate (BEC), offers various
+aspects of advantages over liquid helium. On the one hand, BEC is weakly
+interacting and has spin degrees of freedom. On the other hand, it is
+convenient to tune almost all the parameters of a BEC, for example, the kinetic
+energy by spin-orbit coupling, the density by the external potential, and the
+interaction by Feshbach resonance. Great efforts have been devoted to studying
+these new aspects of superfluidity, and the results have greatly enriched our
+understanding of superfluidity. Here we review these developments by focusing
+on the stability and critical velocity of various superfluids. The BEC systems
+considered include a uniform superfluid in free space, a superfluid with its
+density periodically modulated, a superfluid with artificially engineered
+spin-orbit coupling, and a superfluid of pure spin current. Due to the weak
+interaction, these BEC systems can be well described by the mean field
+Gross-Pitaevskii theory and their superfluidity, in particular critical
+velocities, can be examined with Landau's theory of superfluid. Experimental
+proposals to observe these new aspects of superfluidity are discussed.",1501.04153v1
+2015-05-15,Filling constraints for spin-orbit coupled insulators in symmorphic and non-symmorphic crystals,"We determine conditions on the filling of electrons in a crystalline lattice
+to obtain the equivalent of a band insulator -- a gapped insulator with neither
+symmetry breaking nor fractionalized excitations. We allow for strong
+interactions, which precludes a free particle description. Previous approaches
+that extend the Lieb-Schultz-Mattis argument invoked spin conservation in an
+essential way, and cannot be applied to the physically interesting case of
+spin-orbit coupled systems. Here we introduce two approaches, the first an
+entanglement based scheme, while the second studies the system on an
+appropriate flat `Bieberbach' manifold to obtain the filling conditions for all
+230 space groups. These approaches only assume time reversal rather than spin
+rotation invariance. The results depend crucially on whether the crystal
+symmetry is symmorphic. Our results clarify when one may infer the existence of
+an exotic ground state based on the absence of order, and we point out
+applications to experimentally realized materials. Extensions to new situations
+involving purely spin models are also mentioned.",1505.04193v4
+2017-08-09,Dynamics of interacting fermions under spin-orbit coupling in an optical lattice clock,"Quantum statistics and symmetrization dictate that identical fermions do not
+interact via s-wave collisions. However, in the presence of spin-orbit coupling
+(SOC), fermions prepared in identical internal states with distinct momenta
+become distinguishable. The resulting strongly interacting system can exhibit
+exotic topological and pairing behaviors, many of which are yet to be observed
+in condensed matter systems. Ultracold atomic gases offer a promising pathway
+for simulating these rich phenomena. Two recent experiments reported the
+observation of single atom SOC in optical lattice clocks (OLCs) based on
+alkaline-earth atoms. In these works encoding the effective spin degree of
+freedom in the long-lived electronic clock states significantly reduced the
+detrimental effects of spontaneous emission and heating that have thus far
+hindered the study of interacting SOC with alkali atoms. Beyond first studies
+of interacting SOC with alkali atoms in a bulk gas and with two particles in a
+lattice, here we enter a new regime of many-body interacting SOC in an OLC.
+Using clock spectroscopy, we observe the precession of the collective
+magnetization and the emergence of spin locking effects arising from an
+interplay between p-wave and SOC-induced exchange interactions. The many-body
+dynamics are well captured by a collective XXZ spin model, which describes a
+broad class of condensed matter systems ranging from superconductors to quantum
+magnets. Furthermore, our work will aid in the design of next-generation OLCs
+by offering a route for avoiding the observed large density shifts caused by
+SOC-induced exchange interactions.",1708.02704v2
+2017-01-29,Spin-triplet $f$-wave symmetry in superconducting monolayer $MoS_2$,"The proximity-induced spin-triplet $f$-wave symmetry pairing in a monolayer
+molybdenum disulfide-superconductor hybrid features an interesting
+electron-hole excitations and also effective superconducting subgap, giving
+rise to a distinct Andreev resonance state. Owing to the complicated Fermi
+surface and momentum dependency of $f$-wave pair potential, monolayer $MoS_2$
+with strong spin-orbit coupling can be considered an intriguing structure to
+reveal the superconducting state. Actually, this can be possible by calculating
+the peculiar spin-valley polarized transport of quasiparticles in a related
+normal metal/superconductor junction. We theoretically study the formation of
+effective gap at the interface and resulting normalized conductance on top of a
+$MoS_2$ under induction of $f$-wave order parameter, using
+Bloder-Tinkham-Klapwijk formalism. The superconducting excitations shows that
+the gap is renormalized by a \textit{bias limitation} coefficient including
+dynamical band parameters of monolayer $MoS_2$, especially, ones related to the
+Schrodinger-type momentum of Hamiltonian. The effective gap is more sensitive
+to the n-doping regime of superconductor region. The signature of spin-orbit
+coupling, topological and asymmetry mass-related terms in the resulting subgap
+conductance and, in particular, maximum conductance is presented. In the
+absence of topological term, the effective gap reaches to its maximum value.
+The unconventional nature of superconducting order leads to the appearance of
+zero-bias conductance. In addition, the maximum value of conductance can be
+controlled by tuning the doping level of normal and superconductor regions.",1701.08352v1
+2020-12-02,Layer- and Gate-tunable Spin-Orbit Coupling in a High Mobility Few-Layer Semiconductor,"Spin-orbit coupling (SOC) is a relativistic effect, where an electron moving
+in an electric field experiences an effective magnetic field in its rest frame.
+In crystals without inversion symmetry, it lifts the spin degeneracy and leads
+to many magnetic, spintronic and topological phenomena and applications. In
+bulk materials, SOC strength is a constant that cannot be modified. Here we
+demonstrate SOC and intrinsic spin-splitting in atomically thin InSe, which can
+be modified over an unprecedentedly large range. From quantum oscillations, we
+establish that the SOC parameter \alpha is thickness-dependent; it can be
+continuously modulated over a wide range by an out-of-plane electric field,
+achieving intrinsic spin splitting tunable between 0 and 20 meV. Surprisingly,
+\alpha could be enhanced by an order of magnitude in some devices, suggesting
+that SOC can be further manipulated. Our work highlights the extraordinary
+tunability of SOC in 2D materials, which can be harnessed for in operando
+spintronic and topological devices and applications.",2012.00937v1
+2020-12-18,Fortuitous partners of antiferromagnetic and Mott states in spin-orbit-coupled Sr2IrO4: A study of Sr2Ir1-xMxO4 (M=Fe or Co),"Sr2IrO4 is an archetypal spin-orbit-coupled Mott insulator with an
+antiferromagnetic state below 240 K. Here we report results of our study on
+single crystals of Sr2Ir1-xFexO4 (0<x<0.32) and Sr2Ir1-xCoxO4 (0<x<0.22). Fe
+doping retains the antiferromagnetic state but simultaneously precipitates an
+emergent metallic state whereas Co doping causes a rapid collapse of both the
+antiferromagnetic and Mott states, giving rise to a confined metallic state
+featuring a pronounced linearity of the basal-plane resistivity up to 700 K.
+The results indicate tetravalent Fe4+(3d4) ions in the intermediate spin state
+with S=1 and Co4+(3d5) ions in the high spin state with S=5/2 substituting for
+Ir4+(5d5) ions in Sr2IrO4, respectively. The effective magnetic moment closely
+tracks the N\'eel temperature as doping increases, suggesting that the spin
+state of the dopant predominately determines the magnetic properties in doped
+Sr2IrO4. Furthermore, all relevant properties including charge-carrier density
+(e.g., 1028/m3), Sommerfeld coefficient (e.g., 19 mJ/mole K2) and Wilson ratio
+(e.g., 2.6), consistently demonstrates a metallic state that is both robust and
+highly correlated in the two systems, arising from the percolation of bound
+states and the weakening of structural distortions. This study strongly
+suggests that the antiferromagnetic and Mott states merely coexist in a
+fortuitous manner in Sr2IrO4.",2012.09989v1
+2020-08-03,Symmetry-resolved two-magnon excitations in a strong spin-orbit-coupled bilayer antiferromagnet,"We used a combination of polarized Raman spectroscopy and spin wave
+calculations to study magnetic excitations in the strong spin-orbit-coupled
+(SOC) bilayer perovskite antiferromagnet $Sr_3Ir_2O_7$. We observed two broad
+Raman features at ~ 800 $cm^{-1}$ and ~ 1400 $cm^{-1}$ arising from magnetic
+excitations. Unconventionally, the ~ 800 $cm^{-1}$ feature is fully symmetric
+($A_{1g}$) with respect to the underlying tetragonal ($D_{4h}$) crystal lattice
+which, together with its broad line shape, definitively rules out the
+possibility of a single magnon excitation as its origin. In contrast, the ~
+1400 $cm^{-1}$ feature shows up in both the $A_{1g}$ and $B_{2g}$ channels.
+From spin wave and two-magnon scattering cross-section calculations of a
+tetragonal bilayer antiferromagnet, we identified the ~ 800 $cm^{-1}$ (~ 1400
+$cm^{-1}$) feature as two-magnon excitations with pairs of magnons from the
+zone-center $\Gamma$ point (zone-boundary van Hove singularity X point). We
+further found that this zone-center two-magnon scattering is unique to bilayer
+perovskite magnets which host an optical branch in addition to the acoustic
+branch, as compared to their single layer counterparts. This zone-center
+two-magnon mode is distinct in symmetry from the time-reversal symmetry broken
+spin wave gap and phase mode proposed to explain the ~ 92 meV (742 $cm^{-1}$)
+gap in RIXS magnetic excitation spectra of $Sr_3Ir_2O_7$.",2008.01052v1
+2021-04-05,Transverse Rashba Effect and Unconventional Magnetocrystalline Anisotropy in Double-Gd-adsorbed Zigzag Graphene Nanoribbon,"The transverse Rashba effect is proposed and investigated by the
+first-principle calculations based on density functional theory in a
+quasi-one-dimensional antiferromagnet with a strong perpendicular
+magnetocrystalline anisotropy, which is materialized by the Gd-adsorbed
+graphene nanoribbon with a centric symmetry. The Rashba effect in this system
+is associated with the local dipole field transverse to and in the plane of the
+nanoribbon. That dipole field is induced by the off-center adsorption of the Gd
+adatom above the hex-carbon ring near the nanoribbon edges. The transverse
+Rashba effect at the two Gd adatoms enhances each other in the
+antiferromagnetic (AFM) ground state and cancels each other in the
+ferromagnetic (FM) meta-stable state, because of the centrosymmetric atomic
+structure. The transverse Rashba parameter is 1.51 eV A. This system shows a
+strong perpendicular magnetocrystalline anisotropy (MCA), which is 1.4 meV per
+Gd atom in the AFM state or 2.2 meV per Gd atom in the FM state. The origin of
+the perpendicular MCA is analyzed in k-space by filtering out the contribution
+of the transverse Rashba effect from the band structures perturbed by the
+spin-orbit coupling interactions. The first-order perturbation of the orbit and
+spin angular momentum coupling is the major source of the MCA, which is
+associated with the one-dimensionality of the system. The transverse Rashba
+effect and the strong perpendicular magnetization hosted simultaneously by the
+proposed AFM Gd-adsorbed graphene nanoribbon lock the up- (or down-) spin
+quantization direction to the forward (or backward) movement. This finding
+offers a magnetic approach to a high coherency spin propagation in
+one-dimensionality, and open a new door to manipulating spin transportation in
+graphene-based spintronics.",2104.01922v1
+2019-05-27,Proximity Effect in Superconducting Heterostructures with Strong Spin-Orbit Coupling and Spin Splitting,"It has been shown that singlet Cooper pairs can be converted into triplet
+ones and diffuse into a ferromagnet over a long distance in a phenomenon known
+as the long-range proximity effect (LRPE). This happens in materials with
+inhomogeneous magnetism or spin-orbit coupling (SOC). Most of the previous
+studies focus on the cases with small SOC and exchange field. However, the
+physics was not clear when SOC and exchange field strength are both much
+greater than the disorder strength. In this work, we consider a two dimensional
+system with a large Rashba-type SOC and exchange field in the case where only
+one band is partially occupied. We develop a generalized quasiclassical theory
+by projecting the Green function onto the partially occupied band (POB). We
+find that when the SOC energy scale is comparable with the exchange field,
+there is no LRPE. The reason is that the nonmagnetic impurities together with
+the large SOC and exchange field can effectively generate spin-flip scattering,
+which suppresses the proximity effect. We also show that when increasing either
+SOC or exchange field, the decay length of superconducting correlations can be
+significantly increased due to an approximately restored time reversal symmetry
+or spin rotation symmetry around the $z$ (out-of-plane) axis.",1905.11135v1
+2019-05-29,Electrically driven optical interferometry with spins in silicon carbide,"Interfacing solid-state defect electron spins to other quantum systems is an
+ongoing challenge. The ground-state spin's weak coupling to its environment
+bestows excellent coherence properties, but also limits desired drive fields.
+The excited-state orbitals of these electrons, however, can exhibit stronger
+coupling to phononic and electric fields. Here, we demonstrate electrically
+driven coherent quantum interference in the optical transition of single,
+basally oriented divacancies in commercially available 4H silicon carbide. By
+applying microwave frequency electric fields, we coherently drive the
+divacancy's excited-state orbitals and induce Landau-Zener-Stuckelberg
+interference fringes in the resonant optical absorption spectrum. Additionally,
+we find remarkably coherent optical and spin subsystems enabled by the basal
+divacancy's symmetry. These properties establish divacancies as strong
+candidates for quantum communication and hybrid system applications, where
+simultaneous control over optical and spin degrees of freedom is paramount.",1905.12780v1
+2020-03-05,N$^3$LO gravitational spin-orbit coupling at order $G^4$,"In this paper we derive for the first time the N$^3$LO gravitational
+spin-orbit coupling at order $G^4$ in the post-Newtonian (PN) approximation
+within the effective field theory (EFT) of gravitating spinning objects. This
+represents the first computation in a spinning sector involving three-loop
+integration. We provide a comprehensive account of the topologies in the
+worldline picture for the computation at order $G^4$. Our computation makes use
+of the publicly-available \texttt{EFTofPNG} code, which is extended using
+loop-integration techniques from particle amplitudes. We provide the results
+for each of the Feynman diagrams in this sector. The three-loop graphs in the
+worldline picture give rise to new features in the spinning sector, including
+divergent terms and logarithms from dimensional regularization, as well as
+transcendental numbers, all of which survive in the final result of the
+topologies at this order. This result enters at the 4.5PN order for
+maximally-rotating compact objects, and together with previous work in this
+line, paves the way for the completion of this PN accuracy.",2003.02827v3
+2021-02-04,Self-duality of One-dimensional Quasicrystals with Spin-Orbit Interaction,"Non-interacting spinless electrons in one-dimensional quasicrystals,
+described by the Aubry-Andr\'{e}-Harper (AAH) Hamiltonian with nearest
+neighbour hopping, undergoes metal to insulator transition (MIT) at a critical
+strength of the quasi-periodic potential. This transition is related to the
+self-duality of the AAH Hamiltonian. Interestingly, at the critical point,
+which is also known as the self-dual point, all the single particle wave
+functions are multifractal or non-ergodic in nature, while they are ergodic and
+delocalized (localized) below (above) the critical point. In this work, we have
+studied the one dimensional quasi-periodic AAH Hamiltonian in the presence of
+spin-orbit (SO) coupling of Rashba type, which introduces an additional spin
+conserving complex hopping and a spin-flip hopping. We have found that,
+although the self-dual nature of AAH Hamiltonian remains unaltered, the
+self-dual point gets affected significantly. Moreover, the effect of the
+complex and spin-flip hoppings are identical in nature. We have extended the
+idea of Kohn's localization tensor calculations for quasi-particles and
+detected the critical point very accurately. These calculations are followed by
+detailed multifractal analysis along with the computation of inverse
+participation ratio and von Neumann entropy, which clearly demonstrate that the
+quasi-particle eigenstates are indeed multifractal and non-ergodic at the
+critical point. Finally, we mapped out the phase diagram in the parameter space
+of quasi-periodic potential and SO coupling strength.",2102.02387v2
+2021-03-03,Spinorial formulation of the GW-BSE equations and spin properties of excitons in 2D Transition Metal Dichalcogenides,"In many paradigmatic materials, like Transition Metal Dichalcogenides, the
+role played by the spin degrees of freedom is as important as the one played by
+the electron-electron interaction. Thus an accurate treatment of the two
+effects and of their interaction is necessary for an accurate and predictive
+study of the optical and electronic properties of these materials. Despite the
+GW-BSE approach correctly accounts for electronic correlations the spin-orbit
+coupling effect is often neglected or treated perturbatively. Recently
+spinorial formulations of GW-BSE have become available in different flavours in
+material-science codes. Still an accurate validation and comparison of
+different approaches is missing. In this work we go through the derivation of
+non collinear GW-BSE approach. The scheme is applied to transition metal
+dichalcogenides comparing perturbative and full spinorial approach. Our
+calculations reveal that dark-bright exciton splittings are generally improved
+when the spin orbit coupling is included non perturbatively. The
+exchange-driven intravalley mixing between the A and B exciton is found to be
+extremely important in the case of MoSe$_2$. We finally define the excitonic
+spin and use it to sharply analyze the spinorial properties of Transition Metal
+Dichalcogenides excitonic states.",2103.02266v1
+2021-07-23,Coexistence of topological and nontopological Fermi-superfluid phases,"The two-dimensional spin-imbalanced Fermi gas subject to s-wave pairing and
+spin-orbit coupling is considered a promising platform for realizing a
+topological chiral-p-wave superfluid. In the BCS limit of s-wave pairing, i.e.,
+when Cooper pairs are only weakly bound, the system enters the topological
+phase via a second-order transition driven by increasing the Zeeman
+spin-splitting energy. Stronger attractive two-particle interactions cause the
+system to undergo the BCS-BEC crossover, in the course of which the topological
+transition becomes first-order. As a result, topological and nontopological
+superfluids coexist in spatially separated domains in an extended region of
+phase space spanned by the strength of s-wave interactions and the Zeeman
+energy. Here we investigate this phase-coexistence region theoretically using a
+zero-temperature mean-field approach. Exact numerical results are presented to
+illustrate basic physical characteristics of the coexisting phases and to
+validate an approximate analytical description derived for weak spin-orbit
+coupling. Besides extending our current understanding of spin-imbalanced
+superfluid Fermi systems, the present approach also provides a platform for
+future studies of unconventional Majorana excitations that, according to
+topology, should be present at the internal interface between coexisting
+topological and nontopological superfluid parts of the system.",2107.10973v3
+2022-07-05,Unidirectional Magnetoresistance in Antiferromagnet/Heavy-metal bilayers,"The interplay between electronic transport and antiferromagnetic order has
+attracted a surge of interest as recent studies have shown that a moderate
+change in the spin orientation of a collinear antiferromagnet may have a
+significant effect on the electronic band structure. Among numerous electrical
+probes to read out such magnetic order, unidirectional magnetoresistance (UMR),
+where the resistance changes under the reversal of the current direction, can
+provide rich insights into the transport properties of spin-orbit coupled
+systems. However, UMR has never been observed in antiferromagnets before, given
+the absence of intrinsic spin-dependent scattering. Here, we report a UMR in
+the antiferromagnetic phase of a FeRh$|$Pt bilayer, which undergoes a sign
+change and then increases strongly with an increasing external magnetic field,
+in contrast to UMRs in ferromagnetic and nonmagnetic systems. We show that
+Rashba spin-orbit coupling alone cannot explain the sizable UMR in the
+antiferromagnetic bilayer and that field-induced spin canting distorts the
+Fermi contours to greatly enhance the UMR by two orders of magnitude. Our
+results can motivate the growing field of antiferromagnetic spintronics, and
+suggest a route to the development of tunable antiferromagnet-based spintronics
+devices.",2207.02293v1
+2022-08-21,Phase diagram of the square lattice Hubbard model with Rashba-type antisymmetric spin-orbit coupling,"We clarify the ground state phase diagram of the half-filled square-lattice
+Hubbard model with Rashba spin-orbit coupling (SOC) characterized by the
+spin-split energy bands due to broken inversion symmetry. Although the Rashba
+metals and insulating magnets have been studied well, the intermediate
+interaction strength of the system remained elusive due to the lack of
+appropriate theoretical tools to unbiasedly describe the large-scale magnetic
+structures. We complementarily apply four different methods; sine square
+deformed mean-field theory, random phase approximation, Luttinger-Tisza method,
+and density matrix embedding theory, and succeed in capturing the
+incommensurate spin density-wave (SDW) phases with very long spatial periods
+which were previously overlooked. The transition to the SDW phases from the
+metallic phase is driven by an unprecedented instability that nests the two
+parts of the Fermi surface carrying opposite spins. For large SOC, the spiral,
+stipe, and vortex phases are obtained, when the four Dirac points exist near
+the Fermi level and their whole linear dispersions nest by a wavelength $\pi$,
+opening a band gap. These two types of transition provide Fermiology that
+distinguishes the antisymmetric SOC systems, generating a variety of magnetic
+phases that start from the relatively weak correlation regime and continue to
+the strongly interacting limit.",2208.09902v2
+2023-04-12,Reentrant proximity-induced superconductivity for GeTe semimetal,"We experimentally investigate charge transport in In-GeTe and In-GeTe-In
+proximity devices, which are formed as junctions between superconducting indium
+leads and thick single crystal flakes of $\alpha$-GeTe topological semimetal.
+We observe nonmonotonic effects of the applied external magnetic field,
+including reentrant superconductivity in In-GeTe-In Josephson junctions:
+supercurrent reappears at some finite magnetic field. For a single In-GeTe
+Andreev junction, the superconducting gap is partially suppressed in zero
+magnetic field, while the gap is increased nearly to the bulk value for some
+finite field before its full suppression. We discuss possible reasons for the
+results obtained, taking into account spin polarization of Fermi arc surface
+states in topological semimetal $\alpha$-GeTe with a strong spin-orbit
+coupling. In particular, the zero-field surface state spin polarization
+partially suppresses the superconductivity, while it is recovered due to the
+modified spin-split surface state configuration in finite fields. As an
+alternative possible scenario, the transition into the
+Fulde-Ferrell-Larkin-Ovchinnikov state is discussed. However, the role of
+strong spin-orbit coupling in forming the nonmonotonic behavior has not been
+analyzed for heterostructures in the Fulde-Ferrell-Larkin-Ovchinnikov state,
+which is crucial for junctions involving GeTe topological semimetal.",2304.05971v2
+2024-02-02,Symmetry breaking and spin-orbit coupling for individual vacancy-induced in-gap states in MoS2 monolayers,"Spins confined to point defects in atomically-thin semiconductors constitute
+well-defined atomic-scale quantum systems that are being explored as single
+photon emitters and spin qubits. Here, we investigate the in-gap electronic
+structure of individual sulphur vacancies in molybdenum disulphide (MoS2)
+monolayers using resonant tunneling scanning probe spectroscopy in the Coulomb
+blockade regime. Spectroscopic mapping of defect wavefunctions reveals an
+interplay of local symmetry breaking by a charge-state dependent Jahn-Teller
+lattice distortion that, when combined with strong (~100 meV) spin-orbit
+coupling, leads to a locking of an unpaired spin-1/2 magnetic moment to the
+lattice at low temperature, susceptible to lattice strain. Our results provide
+new insights into spin and electronic structure of vacancy induced in-gap
+states towards their application as electrically and optically addressable
+quantum systems.",2402.01193v2
+2011-07-07,Reduced effective spin-orbital degeneracy and spin-orbital ordering in paramagnetic transition metal oxides: Sr2IrO4 vs. Sr2RhO4,"We discuss the notions of spin-orbital polarization and ordering in
+paramagnetic materials, and address their consequences in transition metal
+oxides. Extending the combined density functional and dynamical mean field
+theory scheme to the case of materials with large spin-orbit interactions, we
+investigate the electronic excitations of the paramagnetic phases of Sr2IrO4
+and Sr2RhO4. We show that the interplay of spin-orbit interactions, structural
+distortions and Coulomb interactions suppresses spin-orbital fluctuations. As a
+result, the room temperature phase of Sr2IrO4 is a paramagnetic spin-orbitally
+ordered Mott insulator. In Sr2RhO4, the effective spin-orbital degeneracy is
+reduced, but the material remains metallic, due to both, smaller spin-orbit and
+smaller Coulomb interactions. We find excellent agreement of our ab-initio
+calculations for Sr2RhO4 with angle-resolved photoemission, and make
+predictions for spectra of the paramagnetic phase of Sr2IrO4.",1107.1371v1
+2021-05-20,Spin-orbital-momentum locking under odd-parity magnetic quadrupole ordering,"Odd-parity magnetic and magnetic toroidal multipoles in the absence of both
+spatial-inversion and time-reversal symmetries are sources of multiferroic and
+nonreciprocal optical phenomena. We investigate electronic states caused by an
+emergent odd-parity magnetic quadrupole (MQ) as a representative example of
+magnetic odd-parity multipoles. It is shown that spontaneous ordering of the MQ
+leads to an antisymmetric spin-orbital polarization in momentum space, which
+corresponds to a spin-orbital momentum locking at each wave vector. By symmetry
+argument, we show that the orbital or sublattice degree of freedom is
+indispensable to give rise to the spin-orbital momentum locking. We demonstrate
+how the electronic band structures are modulated by the MQ ordering in the
+three-orbital system, in which the MQ is activated by the spin-dependent
+hybridization between the orbitals with different spatial parities. The
+spin-orbital momentum locking is related with the microscopic origin of
+cross-correlated phenomena, e.g., the magnetic-field-induced symmetric and
+antisymmetric spin polarization in the band structure, the current-induced
+distortion, and the magnetoelectric effect. We also discuss similar
+spin-orbital momentum locking in antiferromagnet where the MQ degree of freedom
+is activated through the antiferromagnetic spin structure in a sublattice
+system.",2105.09444v1
+2022-07-25,Spin-orbit torques from topological insulator surface states: Effect of extrinsic spin-orbit scattering on an out-of-plane magnetization,"The origins of the spin-orbit torque (SOT) at ferromagnet/topological
+insulator (FM/TI) interfaces are incompletely understood. Theory has
+overwhelmingly focussed on the Edelstein effect due to the surface states in
+the presence of a scalar scattering potential. We investigate here the
+contribution to the SOT due to extrinsic spin-orbit scattering of the surface
+states, focusing on the case of an out-of-plane magnetization. We show that
+spin-orbit scattering brings about a sizable renormalization of the field-like
+SOT, which exceeds 20$\%$ at larger strengths of the extrinsic spin-orbit
+parameter. The resulting SOT exhibits a maximum as a function of the Fermi
+energy, magnetization, and extrinsic spin-orbit strength. The field-like SOT
+decreases with increasing disorder strength while the damping-like SOT is
+independent of the impurity density. With experimental observation in mind we
+also determine the role of extrinsic spin-orbit scattering on the anomalous
+Hall effect. Our results suggest extrinsic spin-orbit scattering is a
+significant contributor to the surface SOT stemming from the Edelstein effect
+when the magnetization is out of the plane.",2207.12440v1
+2004-11-27,Estimating spinning binary parameters and testing alternative theories of gravity with LISA,"We investigate the effect of spin-orbit and spin-spin couplings on the
+estimation of parameters for inspiralling compact binaries of massive black
+holes, and for neutron stars inspiralling into intermediate-mass black holes,
+using hypothetical data from the proposed Laser Interferometer Space Antenna
+(LISA). We work both in Einstein's theory and in alternative theories of
+gravity of the scalar-tensor and massive-graviton types. We restrict the
+analysis to non-precessing spinning binaries, i.e. to cases where the spins are
+aligned normal to the orbital plane. We find that the accuracy with which
+intrinsic binary parameters such as chirp mass and reduced mass can be
+estimated within general relativity is degraded by between one and two orders
+of magnitude. We find that the bound on the coupling parameter omega_BD of
+scalar-tensor gravity is significantly reduced by the presence of spin
+couplings, while the reduction in the graviton-mass bound is milder. Using fast
+Monte-Carlo simulations of 10^4 binaries, we show that inclusion of spin terms
+in massive black-hole binaries has little effect on the angular resolution or
+on distance determination accuracy. For stellar mass inspirals into
+intermediate-mass black holes, the angular resolution and the distance are
+determined only poorly, in all cases considered. We also show that, if LISA's
+low-frequency noise sensitivity can be extrapolated from 10^-4 Hz to as low as
+10^-5 Hz, the accuracy of determining both extrinsic parameters (distance, sky
+location) and intrinsic parameters (chirp mass, reduced mass) of massive
+binaries may be greatly improved.",0411129v2
+2021-09-30,Spin pumping from antiferromagnetic insulator spin-orbit-proximitized by adjacent heavy metal: A first-principles Floquet-nonequilibrium Green's function study,"Motivated by recent experiments [P. Vaidya {\em et al.}, Science {\bf 368},
+160 (2020)] on spin pumping from sub-THz radiation-driven uniaxial
+antiferromagnetic insulator (AFI) MnF$_2$ into heavy metal (HM) Pt hosting
+strong spin-orbit (SO) coupling, we compute and compare pumped spin currents in
+Cu/MnF$_2$/Cu and Pt/MnF$_2$/Cu heterostructures. Recent theories of spin
+pumping by AFI have relied on simplistic Hamiltonians (such as tight-binding)
+and the scattering approach to quantum transport yielding the so-called
+interfacial spin mixing conductance (SMC), but the concept of SMC ceases to be
+applicable when SO coupling is present directly at the interface. In contrast,
+we use more general first-principles quantum transport approach which combines
+noncollinear density functional theory with Floquet-nonequilibrium Green's
+functions in order to take into account: {\em SO-proximitized AFI} as a new
+type of quantum material, different from isolated AFI and brought about by AFI
+hybridization with adjacent HM layer; SO coupling at interfaces; and evanescent
+wavefunctions penetrating from Pt or Cu into AFI layer to make its interfacial
+region {\em conducting} rather than insulating as in the original AFI. The DC
+component of pumped spin current $I_\mathrm{DC}^{S_z}$ vs. precession cone
+angle $\theta_{\vb*{l}}$ of the N\'eel vector $\vb*{l}$ of AFI {\em does not}
+follow putative $I^{S_z}_\mathrm{DC} \propto \sin^2 \theta_{\vb*{l}}$, except
+for very small angles $\theta_{\vb*{l}} \lesssim 10^\circ$ for which we can
+define an {\em effective} SMC from the prefactor and find that it doubles from
+MnF$_2$/Cu to MnF$_2$/Pt interface. In addition, the angular dependence
+$I^{S_z}_\mathrm{DC}(\theta_{\vb*{l}})$ differs for opposite directions of
+precession of the N\'{e}el vector, leading to twice as large SMC for the
+right-handed than for the left-handed chirality of the precession mode.",2109.15249v2
+2014-02-16,Tidal Dissipation and Obliquity Evolution in Hot Jupiter Systems,"Two formation scenarios have been proposed to explain the tight orbits of hot
+Jupiters. They could be formed in orbits with a small inclination (with respect
+to the stellar spin) via disk migration, or in more highly inclined orbits via
+high-eccentricity migration, where gravitational interactions with a companion
+and tidal dissipation are at play. Here we target hot Jupiter systems where the
+misalignment $\lambda$ has been inferred observationally and we investigate
+whether their properties are consistent with high-eccentricity migration.
+Specifically, we study whether stellar tides can be responsible for the
+observed distribution of $\lambda$ and orbital separations. Improving on
+previous studies, we use detailed models for each star, thus accounting for how
+convection (and tidal dissipation) depends on stellar properties. In line with
+observations suggesting that hotter stars have higher $\lambda$, we find that
+$\lambda$ increases as the amount of stellar surface convection decreases. This
+trend supports the hypothesis that tides are the mechanism shaping the observed
+distribution of $\lambda$. Furthermore, we study the past orbital evolution of
+five representative systems, chosen to cover a variety of temperatures and
+misalignments. We consider various initial orbital configurations and integrate
+the equations describing the coupled evolution of the orbital separation,
+stellar spin, and misalignment. We account for stellar tides and wind mass
+loss, stellar evolution, and magnetic braking. We show that the current
+properties of these five representative systems can be explained naturally,
+given our current understanding of tidal dissipation and with physically
+motivated assumptions for the effects driving the orbital evolution.",1402.3857v2
+2021-08-26,Coherent strong-coupling of terahertz magnons and phonons in a Van der Waals antiferromagnetic insulator,"Emergent cooperative motions of individual degrees of freedom, i.e.
+collective excitations, govern the low-energy response of system ground states
+under external stimulations and play essential roles for understanding
+many-body phenomena in low-dimensional materials. The hybridization of distinct
+collective modes provides a route towards coherent manipulation of coupled
+degrees of freedom and quantum phases. In magnets, strong coupling between
+collective spin and lattice excitations, i.e., magnons and phonons, can lead to
+coherent quasi-particle magnon polarons. Here, we report the direct observation
+of a series of terahertz magnon polarons in a layered zigzag antiferromagnet
+FePS3 via far-infrared (FIR) transmission measurements. The characteristic
+avoided-crossing behavior is clearly seen as the magnon-phonon detuning is
+continuously changed via Zeeman shift of the magnon mode. The coupling strength
+g is giant, achieving 120 GHz (0.5 meV), the largest value reported so far.
+Such a strong coupling leads to a large ratio of g to the resonance frequency
+(g/{\omega}) of 4.5%, and a value of 29 in cooperativity
+(g^2/{\gamma}_{ph}{\gamma}_{mag}). Experimental results are well reproduced by
+first-principle calculations, where the strong coupling is identified to arise
+from phonon-modulated anisotropic magnetic interactions due to spin-orbit
+coupling. These findings establish FePS3 as an ideal testbed for exploring
+hybridization-induced topological magnonics in two dimensions and the coherent
+control of spin and lattice degrees of freedom in the terahertz regime.",2108.11619v1
+2019-08-13,Chaotic rotation and evolution of asteroids and small planets in high-eccentricity orbits around white dwarfs,"Observed planetary debris in white dwarf atmospheres predominately originate
+from the destruction of small bodies on highly eccentric ($>0.99$) orbits.
+Despite their importance, these minor planets have coupled physical and orbital
+evolution which has remained largely unexplored. Here, we present a novel
+approach for estimating the influence of fast chaotic rotation on the orbital
+evolution of high-eccentricity triaxial asteroids, and formally characterize
+the propagation of their angular rotation velocities and orbital elements as
+random time processes. By employing the impulse approximation, we demonstrate
+that the violent gravitational interactions during periastron passages transfer
+energy between the orbit and asteroid's rotation. If the distribution of spin
+impulses were symmetric around zero, then the net result would be a secular
+decrease of the semimajor axis and a further increase of the eccentricity. We
+find evidence, however, that the chaotic rotation may be self-regulated in such
+a manner that these effects are reduced or nullified. We discover that
+asteroids on highly eccentric orbits can break themselves apart --- in a type
+of YORP-less rotational fission --- without actually entering the Roche radius,
+with potentially significant consequences for the distribution of debris and
+energy requirements for gravitational scattering in metal-polluted white dwarf
+planetary systems. This mechanism provides a steady stream of material
+impacting a white dwarf without rapidly depleting the number of small bodies in
+the stellar system.",1908.04612v1
+2018-10-18,First-principles quantum transport simulation of CuPc on Au(111) and Ag(111),"We investigate equilibrium and transport properties of a copper
+phthalocyanine (CuPc) molecule adsorbed on Au(111) and Ag(111) surfaces. The
+CuPc molecule has essentially three localized orbitals close to the Fermi
+energy resulting in strong local Coulomb repulsion not accounted for properly
+in density functional calculations. Hence, they require a proper many-body
+treatment within, e.g., the Anderson impurity model (AIM). The occupancy of
+these orbitals varies with the substrate on which CuPc is adsorbed. Starting
+from density functional theory calculations, we determine the parameters for
+the AIM embedded in a noninteracting environment that describes the residual
+orbitals of the entire system. While correlation effects in CuPc on Au(111) are
+already properly described by a single orbital AIM, for CuPc on Ag(111) the
+three orbital AIM problem can be simplified into a two orbital problem coupled
+to the localized spin of the third orbital. This results in a Kondo effect with
+a mixed character, displaying a symmetry between SU(2) and SU(4). The computed
+Kondo temperature is in good agreement with experimental values. To solve the
+impurity problem we use the recently developed fork tensor product state
+solver. To obtain transport properties, a scanning tunneling microscope (STM)
+tip is added to the CuPc molecule absorbed on the surface. We find that the
+transmission depends on the detailed position of the STM tip above the CuPc
+molecule in good agreement with differential conductance measurements.",1810.07963v2
+2007-07-19,Quantum transport in noncentrosymmetric superconductors and thermodynamics of ferromagnetic superconductors,"We consider a general Hamiltonian describing coexistence of itinerant
+ferromagnetism, spin-orbit coupling and mixed spin-singlet/triplet
+superconducting pairing in the context of mean-field theory. The Hamiltonian is
+diagonalized and exact eigenvalues are obtained, thus allowing us to write down
+the coupled gap equations for the different order parameters. Our results may
+then be applied to any model describing coexistence of any combination of these
+three phenomena. As a specific application of our results, we consider
+tunneling between a normal metal and a noncentrosymmetric superconductor with
+mixed singlet and triplet gaps. The conductance spectrum reveals information
+about these gaps in addition to how the influence of spin-orbit coupling is
+manifested. We also consider the coexistence of itinerant ferromagnetism and
+triplet superconductivity as a model for recently discovered ferromagnetic
+superconductors. The coupled gap equations are solved self-consistently, and we
+study the conditions necessary to obtain the coexistent regime of
+ferromagnetism and superconductivity. Analytical expressions are presented for
+the order parameters, and we provide an analysis of the free energy to identify
+the preferred system state. Moreover, we make specific predictions concerning
+the heat capacity for a ferromagnetic superconductor. In particular, we report
+a nonuniversal relative jump in the specific heat, depending on the
+magnetization of the system, at the uppermost superconducting phase transition.
+[Shortened abstract due to arXiv submission.]",0707.2875v2
+2018-05-25,Solitons and Josephson-type oscillations in Bose-Einstein condensates with spin-orbit coupling and time-varying Raman frequency,"The existence and dynamics of solitons in quasi-one-dimensional Bose-Einstein
+condensates (BEC) with spin-orbit coupling (SOC) and attractive two-body
+interactions are described for two coupled atomic pseudo-spin components with
+slowly and rapidly varying time-dependent Raman frequency. By varying the Raman
+frequency linearly in time, it was shown that ordinary nonlinear
+Schr\""odinger-type bright solitons can be converted to striped bright solitons
+and vice versa. The internal Josephson oscillations between atom-number of the
+coupled soliton components, and the corresponding center-of-mass motion, are
+studied for different parameter configurations. In this case, a mechanism to
+control the soliton parameters is proposed by considering parametric
+resonances, which can emerge when using time-varying Raman frequencies. Full
+numerical simulations confirm variational analysis predictions when applied to
+the region where regular solitons are expected. In the limit of high
+frequencies, the system is described by a time-averaged Gross-Pitaevskii
+formalism with renormalized nonlinear and SOC parameters and modified
+phase-dependent nonlinearities. By comparing full-numerical simulations with
+averaged results, we have also studied the lower limits for the frequency of
+Raman oscillations in order to obtain stable soliton solutions.",1805.10357v1
+2012-01-10,"Microscopic theory for a ferromagnetic-nanowire/superconductor heterostructure: Transport, fluctuations and topological superconductivity","Motivated by the recent experiment of Wang et al. [Nature Physics 6, 389
+(2010)], who observed a highly unusual transport behavior of ferromagnetic
+Cobalt nanowires proximity-coupled to superconducting electrodes, we study
+proximity effect and temperature-dependent transport in such a mesoscopic
+hybrid structure. It is assumed that the asymmetry in the tunneling barrier
+gives rise to the Rashba spin-orbit-coupling in the barrier that enables
+induced p-wave superconductivity in the ferromagnet to exist. We first develop
+a microscopic theory of Andreev scattering at the spin-orbit-coupled interface,
+derive a set of self-consistent boundary conditions, and find an expression for
+the p-wave minigap in terms of the microscopic parameters of the contact.
+Second, we study temperature-dependence of the resistance near the
+superconducting transition and find that it should generally feature a
+fluctuation-induced peak. The upturn in resistance is related to the
+suppression of the single-particle density of states due to the formation of
+fluctuating pairs, whose tunneling is suppressed. In conclusion, we discuss
+this and related setups involving ferromagnetic nanowires in the context of
+one-dimensional topological superconductors. It is argued that to realize
+unpaired end Majorana modes, one does not necessarily need a half-metallic
+state, but a partial spin polarization may suffice. Finally, we propose yet
+another related class of material systems -- ferromagnetic semiconductor wires
+coupled to ferromagnetic superconductors -- where direct realization of
+Kitaev-Majorana model should be especially straightforward.",1201.2180v2
+2018-06-10,Properties of the electronic fluid of superconducting cuprates from $^{63}$Cu NMR shift and relaxation,"Nuclear magnetic resonance (NMR) provides local, bulk information about the
+electronic properties of materials, and it has been influential for theory of
+high-temperature superconducting cuprates. Importantly, NMR found early that
+nuclear relaxation is much faster than what one expects from coupling to
+fermionic excitations above the critical temperature for superconductivity
+($T_{\rm c}$), i.e. what one estimates from the Knight shift with the Korringa
+law. As a consequence, special electronic spin fluctuations have been invoked.
+Here, based on literature relaxation data it is shown that the electronic
+excitations, to which the nuclei couple with a material and doping dependent
+anisotropy, are rather ubiquitous and Fermi liquid-like. A suppressed NMR spin
+shift rather than an enhanced relaxation leads to the failure of the Korringa
+law for most materials. Shift and relaxation below $T_{\rm c}$ support the view
+of suppressed shifts, as well. A simple model of two coupled electronic spin
+components, one with $3d(x^2-y^2)$ orbital symmetry and the other with an
+isotropic $s$-like interaction can explain the data. The coupling between the
+two components is found to be negative, and it must be related to the pseudogap
+behavior of the cuprates. We can also explain the negative shift conundrum and
+the long-standing orbital shift discrepancy for NMR in the cuprates.",1806.03644v4
+2017-11-15,Geometric effects resulting from square and circular confinements for a particle constrained to a space curve,"Investigating the geometric effects resulting from the detailed behaviors of
+the confining potential, we consider square and circular confinements to
+constrain a particle to a space curve. We find a torsion-induced geometric
+potential and a curvature-induced geometric momentum just in the square case,
+while a geometric gauge potential solely in the circular case. In the presence
+of electromagnetic field, a geometrically induced magnetic moment couples with
+magnetic field as an induced Zeeman coupling only for the circular confinement,
+also. As spin-orbit interaction is considered, we find some additional terms
+for the spin-orbit coupling, which are induced not only by torsion, but also
+curvature. Moreover, in the circular case, the spin also couples with an
+intrinsic angular momentum, which describes the azimuthal motions mapped on the
+space curve. As an important conclusion for the thin-layer quantization
+approach, some substantial geometric effects result from the confinement
+boundaries. Finally, these results are proved on a helical wire.",1711.05453v4
+2021-06-04,Resonant optical topological Hall conductivity from skyrmions,"We study the high frequency Hall conductivity in a two-dimensional (2D) model
+of conduction electrons coupled to a background magnetic skyrmion texture via
+an effective Hund's coupling term. For an ordered skyrmion crystal, a Kubo
+formula calculation using the basis of skyrmion crystal Chern bands reveals a
+resonant Hall response at a frequency set by the Hund's coupling:
+$\hbar\omega_{\text{res}} \approx J_H$. A complementary real-space Kubo formula
+calculation for an isolated skyrmion in a box reveals a similar resonant Hall
+response. A linear relation between the area under the Hall resonant curve and
+the skyrmion density is discovered numerically and is further elucidated using
+a gradient expansion which is valid for smooth textures and a local
+approximation based on a spin-trimer calculation. We point out the issue of
+distinguishing this skyrmion contribution from a similar feature arising from
+spin-orbit interactions, as demonstrated in a model for Rashba spin-orbit
+coupled electrons in a collinear ferromagnet, which is analogous to the
+difficulty of unambiguously separating the d.c. topological Hall effect from
+the anomalous Hall effect. The resonant feature in the high frequency
+topological Hall effect is proposed to provide a potentially useful local
+optical signature of skyrmions via probes such as scanning magneto-optical Kerr
+microscopy.",2106.02641v2
+2009-12-18,Diffusive versus local spin currents in dynamic spin pumping systems,"Using microscopic theory, we investigate the properties of a spin current
+driven by magnetization dynamics. In the limit of smooth magnetization texture,
+the dominant spin current induced by the spin pumping effect is shown to be the
+diffusive spin current, i.e., the one arising from only a diffusion associated
+with spin accumulation. That is to say, there is no effective field that
+locally drives the spin current. We also investigate the conversion mechanism
+of the pumped spin current into a charge current by spin-orbit interactions,
+specifically the inverse spin Hall effect. We show that the spin-charge
+conversion does not always occur and that it depends strongly on the type of
+spin-orbit interaction. In a Rashba spin-orbit system, the local part of the
+charge current is proportional to the spin relaxation torque, and the local
+spin current, which does not arise from the spin accumulation, does not play
+any role in the conversion. In contrast, the diffusive spin current contributes
+to the diffusive charge current. Alternatively, for spin-orbit interactions
+arising from random impurities, the local charge current is proportional to the
+local spin current that constitutes only a small fraction of the total spin
+current. Clearly, the dominant spin current (diffusive spin current) is not
+converted into a charge current. Therefore, the nature of the spin current is
+fundamentally different depending on its origin and thus the spin transport and
+the spin-charge conversion behavior need to be discussed together along with
+spin current generation.",0912.3607v2
+2001-12-31,Kondo effect and anti-ferromagnetic correlation in transport through tunneling-coupled double quantum dots,"We propose to study the transport through tunneling-coupled double quantum
+dots (DQDs) connected in series to leads, using the finite-$U$ slave-boson mean
+field approach developed initially by Kotliar and Ruckenstein [Phys. Rev. Lett.
+{\bf 57}, 1362 (1986)]. This approach treats the dot-lead coupling and the
+inter-dot tunnelling $t$ nonperturbatively at arbitrary Coulomb correlation
+$U$, thus allows the anti-ferromagnetic exchange coupling parameter $J=4t^2/U$
+to appear naturally. We find that, with increasing the inter-dot hopping, the
+DQDs manifest three distinct physical scenarios: the Kondo singlet state of
+each dot with its adjacent lead, the spin singlet state consisting of local
+spins on each dot and the doubly occupied bonding orbital of the coupled dots.
+The three states exhibit remarkably distinct behavior in transmission spectrum,
+linear and differential conductance and their magnetic-field dependence.
+Theoretical predictions agree with numerical renormalization group and Lanczos
+calculations, and some of them have been observed in recent experiments.",0112500v2
+2013-06-19,Spin-Orbit Coupling Induced Coherent Production of Feshbach Molecules in a Degenerate Fermi Gas,"In this work we demonstrate a dynamic process in which SO coupling can
+coherently produce s-wave Feshbach molecules from a fully polarized Fermi gas,
+and can induce a coherent oscillation between Feshbach molecules and spin
+polarized gas. For comparison, we also show that such phenomena are absent if
+the inter-component coupling is momentum-independent. This demonstrates
+experimentally that SO coupling does provide finite matrix element between a
+singlet state and a triplet state, and therefore, implies the bound pairs of a
+system with SO coupling have triplet p-wave component, which can become
+topological superfluid by further cooling these pairs to condensation and
+confining them to lower dimension.",1306.4568v2
+2023-10-29,Coupling conduction-band valleys in modulated SiGe heterostructures via shear strain,"Engineering conduction-band valley couplings is a key challenge for Si-based
+spin qubits. Recent work has shown that the most reliable method for enhancing
+valley couplings entails adding Ge concentration oscillations to the quantum
+well. However, ultrashort oscillation periods are difficult to grow, while long
+oscillation periods do not provide useful improvements. Here, we show that the
+main benefits of short-wavelength oscillations can be achieved in
+long-wavelength structures through a second-order coupling process involving
+Brillouin-zone folding, induced by shear strain. Moreover, we find that the
+same long-wavelength period also boosts spin-orbit coupling. We finally show
+that such strain can be achieved through common fabrication techniques, making
+this an exceptionally promising system for scalable quantum computing.",2310.18879v2
+2001-06-22,Quantum phase transitions in models of coupled magnetic impurities,"We discuss models of interacting magnetic impurities coupled to a metallic
+host. If twice the sum of the impurity spins is larger than the total number of
+host screening channels, the system shows one or more quantum phase transitions
+where the ground-state spin changes as a function of the inter-impurity
+couplings. The simplest example is realized by two spin-1/2 Kondo impurities
+coupled to a single orbital of the host; this model exhibits a singlet-doublet
+transition. We investigate the phase diagram and crossover behavior of this
+model and present Numerical Renormalization Group results together with general
+arguments showing that the quantum phase transition is either of first order or
+of the Kosterlitz-Thouless type, depending on the symmetry of the Kondo
+couplings. Connections to other models and possible applications are discussed.",0106458v2
+2013-10-15,Magneto-Electric Effect in Three-dimensional Coupled Zigzag Chains,"Stimulated by recent studies of quantum phases with broken local inversion
+symmetry, we study the magnetoelectric effect in locally noncentrosymmetric
+metals. We consider three-dimensional (3D) coupled zigzag chains and
+demonstrate that the antiferromagnetic moment is induced by the electric
+current through a staggered antisymmetric spin-orbit coupling. This
+current-induced magnetism is much larger than that in globally
+noncentrosymmetric metals. We provide an intuitive understanding of the
+current-induced antiferromagnetic moment by showing the inverse magnetoelectric
+effect, that is, the ferroic p-wave charge nematic order accompanied by the
+asymmetric band structure in the antiferromagnetic state. We also examine
+conduction electrons coupled to localized spins via Kondo exchange coupling and
+demonstrate a significant enhancement of the magnetoelectric effect. A possible
+experimental observation of the magnetoelectric effect in metals is discussed,
+with focus on LnM_2Al_10 compounds, such as NdRu_Al_10 and TbRu_2Al_10.",1310.3920v2
+2015-05-06,Effects of large induced superconducting gap on semiconductor Majorana nanowires,"With the recent achievement of extremely high-quality epitaxial interfaces
+between InAs nanowires and superconducting Al shells with strong
+superconductor-semiconductor tunnel coupling, a new regime of proximity-induced
+superconductivity in semiconductors can be explored where the induced gap may
+be similar in value to the bulk Al gap (large gap) with negligible subgap
+conductance (hard gap). We propose several experimentally relevant consequences
+of this large-gap strong-coupling regime for tunneling experiments, and we
+comment on the prospects of this regime for topological superconductivity. In
+particular, we show that the advantages of having a strong spin-orbit coupling
+and a large spin g-factor in the semiconductor nanowire may both be compromised
+in this strongly coupled limit, and somewhat weaker interface tunneling may be
+necessary for achieving optimal proximity superconductivity in the
+semiconductor nanowire. We derive a minimal, generic theory for the
+strong-coupling hard-gap regime obtaining good qualitative agreement with the
+experiment and pointing out future directions for further progress toward
+Majorana nanowires in hybrid semiconductor-superconductor structures.",1505.01482v2
+2002-08-15,Low temperature electronic properties of Sr_2RuO_4 II: Superconductivity,"The body centered tetragonal structure of Sr_2RuO_4 gives rise to umklapp
+scattering enhanced inter-plane pair correlations in the d_{yz} and d_{zx}
+orbitals. Based on symmetry arguments, Hund's rule coupling, and a bosonized
+description of the in-plane electron correlations the superconducting order
+parameter is found to be a orbital-singlet spin-triplet with two spatial
+components. The spatial anisotropy is 7%. The different components of the order
+parameter give rise to two-dimensional gapless fluctuations. The phase
+transition is of third order. The temperature dependence of the pair density,
+specific heat, NQR, Knight shift, and susceptibility are in agreement with
+experimental results.",0208307v1
+2003-03-12,Origin of the Orbital Ordering in LaMnO$_3$,"We use the temperature of the structural phase transition to determine the
+Jahn-Teller (JT) coupling constant in the model derived for LaMnO$_3$ which
+includes both the superexchange between S=2 spins and the JT effect. We also
+investigate the dependence of the exchange constants on the value of the
+on-site Coulomb element $U$, and on the orbital ordering.",0303232v1
+2003-03-25,Orbital entanglement and violation of Bell inequalities in mesoscopic conductors,"We propose a spin-independent scheme to generate and detect two-particle
+entanglement in a mesoscopic normal-superconductor system. A superconductor,
+weakly coupled to the normal conductor, generates an orbitally entangled state
+by injecting pairs of electrons into different leads of the normal conductor.
+The entanglement is detected via violation of a Bell inequality, formulated in
+terms of zero-frequency current cross-correlators. It is shown that the Bell
+inequality can be violated for arbitrary strong dephasing in the normal
+conductor.",0303531v1
+2003-04-22,Lattice and superexchange effects in doped CMR manganites,"We report on the influence of the lattice degrees of freedom on charge,
+orbital and spin correlations in colossal magnetoresistance (CMR) manganites.
+For the weakly doped compounds we demonstrate that the electron-phonon coupling
+promotes the trapping of charge carriers, the disappearance of the orbital
+polaron pattern and the breakdown of ferromagnetism at the CMR transition. The
+role of different superexchange interactions is explored.",0304491v1
+2005-06-23,Comment on a Phys. Rev. Lett. paper: 94 (2005) 146402: Orbital symmetry and Electron Correlation in NaxCoO2,"We argue that the electronic structure considered in a Phys. Rev. Lett. paper
+94 (2005) 146402 of the Co3+ ion in the CoO6 octahedron of NaxCoO2 is
+completely wrong. The presented Fig. 1 is redrawn here as Fig. 1. For
+physically adequate electronic structure it is necessary to take into account
+strong intra-atomic electron correlations and spin-orbit coupling. For Co3+
+ions there are 15 low lying many-electron states within 0.1 eV as can be
+obtained in the many-electron CEF approach.",0506615v1
+2005-09-09,Correlated hybridization in transition metal complexes,"We apply local orbital basis density functional theory (using SIESTA) coupled
+with a mapping to the Anderson impurity model to estimate the Coulomb assisted
+or correlated hybridization between transition metal d-orbitals and ligand
+sp-orbitals for a number of molecular complexes. We find remarkably high values
+which can have several physical implications including: (i) renormalization of
+effective single band or multiband Hubbard model parameters for the cuprates
+and, potentially, elemental iron, and (ii) spin polarizing molecular
+transistors.",0509259v4
+2005-11-16,Electronic structure and crystal-field states in V2O3*,"We have calculated the electronic structure of V2O3 associated with the V3+
+ions taking into account strong on-site electron correlations and the
+spin-orbit coupling. Closely lying 9 states of the subterm 3T1g are a physical
+reason for exotic phenomena of V2O3. Electronic structure and magnetism of V3+
+ions in the octahedral surroundings are strongly susceptible to lattice
+distortions and magnetic interactions. Our approach accounts both for the
+insulating ground state, magnetism, including its orbital contribution, as well
+as thermodynamical properties.",0511395v1
+2005-11-25,"Comment on a Phys. Rev. Lett. paper: ""All-Electron Self-Consistent GW Approximation: Application to Si, MnO, and NiO"". Magnetic moment of NiO","We claim that any approach neglecting the spin-orbit coupling and the orbital
+magnetism is not physically adequate for 3d oxides, including NiO, and that in
+reaching ""excellent agreement"" in a Phys. Rev. Lett. 93, 126406 (2004) paper
+too small experimental value of 1.9 muB has been taken for the Ni magnetic
+moment despite publication of a new experimental value of 2.2 muB, at 300 K
+yielding 2.6 muB at T = 0 K, already in a year of 1998.",0511624v1
+2006-07-05,Hybridization expansion impurity solver: General formulation and application to Kondo lattice and two-orbital models,"A recently developed continuous time solver based on an expansion in
+hybridization about an exactly solved local limit is reformulated in a manner
+appropriate for general classes of quantum impurity models including spin
+exchange and pair hopping terms. The utility of the approach is demonstrated
+via applications to the dynamical mean field theory of the Kondo lattice and
+two-orbital models. The algorithm can handle low temperatures and strong
+couplings without encountering a sign problem.",0607136v2
+2007-09-14,Phase diagram of hole doped two-leg Cu-O ladders,"In the weak coupling limit, we establish the phase diagram of a two-leg
+ladder with a unit cell containing both Cu and O atoms, as a function of
+doping. We use bosonization and design a specific RG procedure to handle the
+additional degrees of freedom. Significant differences are found with the
+single orbital case; for purely repulsive interactions, a completely massless
+quantum critical region is obtained at intermediate carrier concentrations
+(well inside the bands) where the ground state consists of an incommensurate
+pattern of orbital currents plus a spin density wave (SDW) structure.",0709.2303v1
+2011-09-06,Topological insulators from complex orbital order in transition-metal oxides heterostructures,"Topological band insulators which are dynamically generated by
+electron-electron interactions have been the- oretically proposed in two and
+three dimensional lattice models. We present evidence that the two-dimensional
+version can be stabilized in digital (111) heterostructures of transition-metal
+oxides as a result of purely local interactions. The topological phases are
+accompanied by spontaneous ordering of complex orbitals and we discuss their
+stability with respect to the Hund's rule coupling, Jahn-Teller interaction and
+inversion symmetry breaking terms. As main competitors we identify spin-nematic
+and magnetic phases.",1109.1297v2
+2014-02-07,Exotic magnetic order in the orbital-selective Mott regime of multiorbital systems,"The orbital-selective Mott phase (OSMP) of multiorbital Hubbard models has
+been extensively analyzed before using static and dynamical mean-field
+approximations. In parallel, the properties of Block states
+(antiferromagnetically coupled ferromagnetic spin clusters) in Fe-based
+superconductors have also been much discussed. The present effort uses
+numerically exact techniques in one-dimensional systems to report the
+observation of Block states within the OSMP regime, connecting two seemingly
+independent areas of research, and providing analogies with the physics of
+Double-Exchange models.",1402.1689v1
+2015-07-01,A tight-binding model for MoS$_2$ monolayers,"We propose an accurate tight-binding parametrization for the band structure
+of MoS$_2$ monolayers near the main energy gap. We introduce a generic and
+straightforward derivation for the band energies equations that could be
+employed for other monolayer dichalcogenides. A parametrization that includes
+spin-orbit coupling is also provided. The proposed set of model parameters
+reproduce both the correct orbital compositions and location of valence and
+conductance band in comparison with ab initio calculations. The model gives a
+suitable starting point for realistic large-scale atomistic electronic
+transport calculations.",1507.00356v1
+2015-10-22,Molecular Anisotropic Magnetoresistance,"Using density functional theory calculations, we demonstrate that the effect
+of anisotropic magnetoresistance (AMR) can be enhanced by orders of magnitude
+with respect to conventional bulk ferromagnets in junctions containing
+molecules sandwiched between ferromagnetic leads. We study ballistic transport
+in metal-benzene complexes contacted by $3d$ transition-metal wires. We show
+that the gigantic AMR can arise from spin-orbit coupling effects in the leads,
+drastically enhanced by orbital-symmetry filtering properties of the molecules.
+We further discuss how this molecular anisotropic magnetoresistance (MAMR) can
+be tuned by proper choice of materials and their electronic properties.",1510.06632v1
+2016-04-04,Approximation schemes for the study of multi-band Gutzwiller wave functions,"The minimum of the Gutzwiller energy functional depends on the number of
+parameters considered in the variational state. For a three-orbital Hubbard
+model we find that the frequently used diagonal Ansatz is very accurate in
+high-symmetry situations. For lower symmetry, induced by a crystal-field
+splitting or the spin-orbit coupling, the discrepancies in energy between the
+most general and a diagonal Gutzwiller Ansatz can be quite significant. We
+discuss approximate schemes that may be employed in multi-band cases where a
+minimization of the general Gutzwiller energy functional is too demanding
+numerically.",1604.00819v1
+2014-06-09,Tidal dissipation in stars and giant planets,"Astrophysical fluid bodies that orbit close to one another induce tidal
+distortions and flows that are subject to dissipative processes. The spin and
+orbital motions undergo a coupled evolution over astronomical timescales, which
+is relevant for many types of binary star, short-period extrasolar planetary
+systems and the satellites of the giant planets in the solar system. I review
+the principal mechanisms that have been discussed for tidal dissipation in
+stars and giant planets in both linear and nonlinear regimes. I also compare
+the expectations based on theoretical models with recent observational
+findings.",1406.2207v1
+2018-08-28,Theory of chiral $p$-wave superconductivity with near-nodes for Sr$_2$RuO$_4$,"We use functional renormalization group method to study a three-orbital model
+for superconducting Sr$_2$RuO$_4$. Although the pairing symmetry is found to be
+chiral $p$-wave, the atomic spin-orbit coupling induces near-nodes for
+quasiparticle excitations. Our theory explains a major experimental puzzle
+between $d$-wave-like feature observed in thermal experiments and the chiral
+$p$-wave triplet pairing revealed in nuclear-magnetic-resonance and Kerr
+effect.",1808.09210v2
+2019-01-19,Calculating the Band Structure of 3C-SiC Using sp3d5s*+$Δ$ Model,"We report on a semi-empirical tight binding model for 3C-SiC including the
+effect of sp3d5s* orbitals and spin-orbital coupling. In this work, we
+illustrate in detail the method to develop such a model for semiconductors with
+zincblende structure, based on Slater-Koster integrals, and we explain the
+optimization method used to fit the experimental results with such a model.
+This method shows high accuracy for the evaluation of 3C-SiC band diagram both
+in terms of the experimental energy levels at high symmetry points and the
+effective masses.",1901.06600v1
+2017-11-17,Renormalization of the Majorana bound state decay length in a perpendicular magnetic field,"Orbital effects of a magnetic field in a proximitized semiconductor nanowire
+are studied in the context of the spatial extent of Majorana bound states. We
+develop analytical model that explains the impact of concurring effects of
+paramagnetic coupling of the nanowire bands via the kinetic energy operator and
+spin-orbit interaction on the Majorana modes. We find, that the perpendicular
+field, so far considered as to be detrimental to the Majorana fermion
+formation, is in fact helpful in establishing the topological zero-energy-modes
+in a finite system due to significant decrease in the Majorana decay length.",1711.06643v3
+2021-10-18,Self-consistent Analysis of Doping Effect for Magnetic Ordering in Stacked-Kagome Weyl System,"We theoretically study the carrier doping effect for magnetism in a
+stacked-kagome system $\rm{{Co}_3{Sn}_2{S}_2}$ based on an effective model and
+the Hartree-Fock method. We show the electron filling and temperature
+dependences of the magnetic order parameter. The perpendicular ferromagnetic
+ordering is suppressed by hole doping, wheres undoped $\rm{{Co}_3{Sn}_2{S}_2}$
+shows magnetic Weyl semimetal state. Additionally, in the electron-doped
+regime, we find a non-collinear antiferromagnetic ordering. Especially, in the
+non-collinear antiferromagnetic state, by considering a certain spin-orbit
+coupling, the finite orbital magnetization and the anomalous Hall conductivity
+are obtained.",2110.09459v1
+2022-04-24,Engineering Majorana corner modes from two-dimensional hexagonal crystals,"Second order topological insulator can be engineered from two-dimensional
+materials with strong spin-orbit coupling and in-plane Zeeman field. In
+proximity to superconductor, topological superconducting phase could be induced
+in the two-dimensional materials, which host Majorana corner modes at the
+intersection between two zigzag edges. Two types of tight binding models in
+hexagonal lattice, which include $p_{z}$ or $p_{x,y}$ orbit(s) in each lattice
+site, are applied to engineer two-dimensional materials in topological
+superconducting phase. In both models, the condition that induces the second
+order topological superconductor requires nonuniform value of either in-plane
+Zeeman fields or superconductor pairing parameters in two sublattices. The
+finite size effect of the second model is weaker than that of the first model.",2204.11178v1
+2023-10-08,Role of Centrosymmetry in the Photophysics of Molecular Aggregates,"To understand the photophysics of molecular aggregates, exciton model of J-
+and H-aggregate has been extensively utilized. However, it lacks consideration
+of crystal symmetry. Although discrete molecules may lack symmetry, their
+aggregates can exhibit a high degree of symmetry. Herein, we utilized group
+theory to study the optical properties of centrosymmetric molecular aggregates,
+showing that their optical selection rules (transition dipole moment and
+spin-orbit coupling) are determined by the symmetry of singlet and triplet
+excited states and the intermolecular orbital overlap. Symmetry-forbidden
+electronic transitions are closely related to ultralong organic
+phosphorescence. Our model's scope is broad, as over 50% of organic crystals
+belong to centrosymmetric space groups according to Cambridge Structural
+Database.",2310.05100v1
+2023-12-21,Finite Temperature Minimal Entangled Typical Thermal States Impurity Solver,"We present a minimally entangled typical thermal state (METTS) quantum
+impurity solver for general multi-orbital systems at finite temperatures. We
+introduce an improved estimator for the single-particle Green's function that
+strongly reduces the large fluctuations at long imaginary time and low
+temperature, which were a severe limitation of the original algorithm. In
+combination with the fork tensor product states ansatz, we obtain a dynamical
+mean field theory (DMFT) quantum impurity solver, which we benchmark for single
+and three-band models down to low temperatures, including the effect of
+spin-orbit coupling in a realistic DMFT computation for the Hund's metal
+Sr$_2$RuO$_4$ down to low temperatures.",2312.13668v2
+2014-02-28,Single-shot readout and relaxation of singlet/triplet states in exchange-coupled $^{31}$P electron spins in silicon,"We present the experimental observation of a large exchange coupling $J
+\approx 300$ $\mu$eV between two $^{31}$P electron spin qubits in silicon. The
+singlet and triplet states of the coupled spins are monitored in real time by a
+Single-Electron Transistor, which detects ionization from tunnel-rate-dependent
+processes in the coupled spin system, yielding single-shot readout fidelities
+above 95%. The triplet to singlet relaxation time $T_1 \approx 4$ ms at zero
+magnetic field agrees with the theoretical prediction for $J$-coupled $^{31}$P
+dimers in silicon. The time evolution of the 2-electron state populations gives
+further insight into the valley-orbit eigenstates of the donor dimer, valley
+selection rules and relaxation rates, and the role of hyperfine interactions.
+These results pave the way to the realization of 2-qubit quantum logic gates
+with spins in silicon, and highlight the necessity to adopt gating schemes
+compatible with weak $J$-coupling strengths.",1402.7148v3
+2016-12-09,Bridging single- and multireference domains for electron correlation: spin-extended coupled electron pair approximation,"We propose a size-consistent generalization of the recently developed
+spin-extended configuration interaction with singles and doubles (ECISD), where
+a CI wave function is explicitly spin-projected. The size-consistent effect is
+effectively incorporated by treating quadruples within the formulation of
+coupled electron pair approximation. As in coupled-cluster theory, quadruple
+excitations are approximated by a disconnected product of double excitations.
+Despite its conceptual similarity to the standard single- and multireference
+analogues, such a generalization requires careful derivation, as the
+spin-projected CI space is non-orthogonal and overcomplete. Although our
+methods generally yield better results than ECISD, size-consistency is only
+approximately retained because the action of a symmetry-projection operator is
+size-inconsistent. In this work, we focus on simple models where
+exclusion-principle-violating terms, which eliminate undesired contributions to
+the correlation effects, are either completely neglected or averaged. These
+models possess an orbital-invariant energy functional that is to be minimized
+by diagonalizing an energy-shifted effective Hamiltonian within the singles and
+doubles manifold. This allows for a straightforward generalization of the ECISD
+analytical gradients needed to determine molecular properties and geometric
+optimization. Given the multireference nature of the spin-projected
+Hartree--Fock method, the proposed approaches are expected to handle static
+correlation, unlike single-reference analogues. We critically assess the
+performance of our methods using dissociation curves of molecules,
+singlet-triplet splitting gaps, hyperfine coupling constants, and the chromium
+dimer. The size-consistency and size-extensivity of the methods are also
+discussed.",1612.02945v2
+2022-11-23,"Electronic structure, magnetic properties, spin orientation, and doping effect in Mn$_3$Si$_2$Te$_6$","The layered material Mn$_3$Si$_2$Te$_6$, with alternating stacking honeycomb
+and triangular layers, is attracting considerable attention due to its rich
+physical properties. Here, using density functional theory and classical Monte
+Carlo (MC) methods, we systematically study this system. Near the Fermi level,
+the states are mainly contributed by Te $5p$ orbitals hybridized with Mn $3d$
+orbitals, resembling a charge transfer system. Furthermore, the spin
+orientations of the ferrimagnetic (FiM) ground state display different
+conductive behaviors when along the $ab$ plane or out-of-plane directions:
+insulating vs. metallic states. The energy difference between the FiM [110]
+insulating and FiM [001] metallic phases is very small($ \sim 0.71$ meV/Mn).
+Changing the angle $\theta$ of spin orientation from in-plane to out-of-plane
+directions, the band gaps of this system are gradually reduced, leading to an
+insulator-metal transition, resulting in an enhanced electrical conductivity,
+related to the colossal angular magnetoresistance (MR) effect. In addition, we
+also constructed the magnetic phase diagram using the classical $XY$ spin model
+studied with the MC method. Three magnetic phases were obtained including
+antiferromagnetic order, noncollinear spin patterns, and FiM order. Moreover,
+we also investigated the Se- and Ge- doping into the Mn$_3$Si$_2$Te$_6$ system:
+the FiM state has the lowest energy among the magnetic candidates for both Se-
+or Ge- doped cases. The magnetic anisotropy energy (MAE) decreases in the
+Se-doped case because the Mn orbital moment is reduced as the doping $x$
+increases. Due to the small spin-orbital coupling effect of Se, the
+insulator-metal transition caused by the spin orientation disappears in the
+Se-doped case, resulting in an insulating phase in the FiM [001] phase. This
+causes a reduced colossal angular MR.",2211.13321v2
+2014-08-29,Strong-coupling limit of depleted Kondo- and Anderson-lattice models,"Fourth-order strong-coupling degenerate perturbation theory is used to derive
+an effective low-energy Hamiltonian for the Kondo-lattice model with a depleted
+system of localized spins. In the strong-J limit, completely local Kondo
+singlets are formed at the spinful sites which bind a fraction of conduction
+electrons. The low-energy theory describes the scattering of the excess
+conduction electrons at the Kondo singlets as well as their effective
+interactions generated by virtual excitations of the singlets. Besides the
+Hubbard term, already discussed by Nozieres, we find a ferromagnetic Heisenberg
+interaction, an antiferromagnetic isospin interaction, a correlated hopping
+and, in more than one dimensions, three- and four-site interactions. The
+interaction term can be cast into highly symmetric and formally simple
+spin-only form using the spin of the bonding orbital symmetrically centered
+around the Kondo singlet. This spin is non-local. We show that, depending on
+the geometry of the depleted lattice, spatial overlap of the non-local spins
+around different Kondo singlets may cause ferromagnetic order. This is
+sustained by a rigorous argument, applicable to the half-filled model, by a
+variational analysis of the stability of the fully polarized Fermi sea of
+excess conduction electrons as well as by exact diagonalization of the
+effective model. A similar fourth-order perturbative analysis is performed for
+the depleted Anderson lattice in the limit of strong hybridization. Even in a
+parameter regime where the Schrieffer-Wolff transformation does not apply, this
+yields the same effective theory albeit with a different coupling constant.",1408.7018v2
+2017-03-01,Quantum-disordered state of magnetic and electric dipoles in a hydrogen-bonded Mott system,"Strongly enhanced quantum fluctuations often lead to a rich variety of
+quantum-disordered states. A representative case is liquid helium, in which
+zero-point vibrations of the helium atoms prevent its solidification at low
+temperatures. A similar behaviour is found for the internal degrees of freedom
+in electrons. Among the most prominent is a quantum spin liquid (QSL), in which
+localized spins are highly correlated but fluctuate even at absolute zero.
+Recently, a coupling of spins with other degrees of freedom has been proposed
+as an innovative approach to generate even more fascinating QSLs such as
+orbital--spin liquids. However, such ideas are limited to the internal degrees
+of freedom in electrons. Here, we demonstrate that a coupling of localized
+spins with the zero-point motion of hydrogen atoms (proton fluctuations) in a
+hydrogen-bonded organic Mott insulator provides a new class of QSLs. We find
+that a divergent dielectric behaviour towards a hydrogen-bond order is
+suppressed by the quantum proton fluctuations, resulting in a quantum
+paraelectric (QPE) state. Furthermore, our thermal-transport measurements
+reveal that a QSL state with gapless spin excitations rapidly emerges upon
+entering the QPE state. These findings indicate that the quantum proton
+fluctuations give rise to a novel QSL --- a quantum-disordered state of
+magnetic and electric dipoles --- through the coupling between the electron and
+proton degrees of freedom.",1703.00324v1
+2016-08-27,Impact of g-factors and valleys on spin qubits in a silicon double quantum dot,"We define single electron spin qubits in a silicon MOS double quantum dot
+system. By mapping the qubit resonance frequency as a function of gate-induced
+electric field, the spectrum reveals an anticrossing that is consistent with an
+inter-valley spin-orbit coupling. We fit the data from which we extract an
+inter-valley coupling strength of 43 MHz. In addition, we observe a narrow
+resonance near the primary qubit resonance when we operate the device in the
+(1,1) charge configuration. The experimental data is consistent with a
+simulation involving two weakly exchanged-coupled spins with a g-factor
+difference of 1 MHz, of the same order as the Rabi frequency. We conclude that
+the narrow resonance is the result of driven transitions between the T- and T+
+triplet states, using an ESR signal of frequency located halfway between the
+resonance frequencies of the two individual spins. The findings presented here
+offer an alternative method of implementing two-qubit gates, of relevance to
+the operation of larger scale spin qubit systems.",1608.07748v2
+2019-09-25,Quantum information processing with closely-spaced diamond color centers in strain and magnetic fields,"Electron and nuclear spins of diamond nitrogen-vacancy (NV) centers are good
+candidates for quantum information processing as they have long coherence time
+and can be initialized and read out optically. However, creating a large number
+of coherently coupled and individually addressable NV centers for quantum
+computing has been a big challenge. Here we propose methods to use high-density
+diamond NV centers coupled by spin-spin interaction with an average separation
+on the order of 10 nm for quantum computing. We propose to use a strain
+gradient to encode the position information of each NV center in the energy
+level of its excited electron orbital state, which causes a shift of its
+optical transition frequency. With such strain encoding, more than 100
+closely-packed NV centers below optical diffraction limit can be read out
+individually by resonant optical excitation. A magnetic gradient will be used
+to shift the electron spin resonant (ESR) frequencies of NV centers. Therefore,
+the spin state of each NV center can be individually manipulated and different
+NV centers can be selectively coupled. A universal set of quantum operations
+for two-qubit and three-qubit system is introduced by careful design of
+external drives. Moreover, entangled states with multiple qubits can be created
+by this protocol, which is a major step towards quantum information processing
+with solid-state spins.",1909.11775v1
+2022-10-02,"Metal-organic kagome systems as candidates to study spin liquids, spin ice or the quantum anomalous Hall effect","We present the results of first-principle calculations using the Vienna
+Ab-initio Simulation Package (VASP) for a new class of organometallics labeled
+TM3C6O6 (TM =Sc, Ti, V, Cr, Fe, Co, Ni and Cu) in the form of planar,
+two-dimensional, periodic free-standing layers. These materials, which can be
+produced by on-surface coordination on metallic surfaces, have a kagome lattice
+of TM ions. Calculating the structural properties, we show that all considered
+materials have local magnetic moments in the ground state, but four of them
+(with Fe, Co, Ni and Cu) show spin-crossover behavior by changing the lattice
+constant, which could be valuable for possible epitaxy routes on various
+substrates. Surprisingly, we find a very large richness of electronic and
+magnetic properties, qualifying these materials as highly promising
+metal-organic topological quantum materials. We find semi-conductors with
+nearest-neighbor ferromagnetic (FM) or antiferromagnetic (AFM) couplings for V,
+and Sc and Cr, respectively, being of potential interest to study spin ice or
+spin liquids on the 2D kagome lattice. Other TM ion systems combine AFM
+couplings with metallic behavior (Ti, Fe and Ni) or are ferromagnetic kagome
+metals like Cu3C6O6 with symmetry protected Weyl crossings at the Fermi
+surface. For the latter compound, the spin orbit coupling is shown to be
+responsible for small gaps which should allow the observation of the quantum
+anomalous Hall effect (QAHE).",2210.00435v2
+2021-09-25,"Anomalies in the electronic structure of a 5$d$ transition metal oxide, IrO$_2$","Ir-based materials have drawn much attention due to the observation of
+insulating phase believed to be driven by spin-orbit coupling while Ir 5$d$
+states are expected to be weakly correlated due to their large orbital
+extensions. IrO$_2$, a simple binary material, shows metallic ground state
+which seems to deviate from the behavior of most other Ir-based materials and
+varied predictions in these material class. We studied the electronic structure
+of IrO$_2$ at different temperatures employing high resolution photoemission
+spectroscopy with photon energies spanning from ultraviolet to hard $x$-ray
+range. Experimental spectra exhibit a signature of enhancement of Ir-O
+covalency in the bulk compared to the surface electronic structure. The
+branching ratio of the spin-orbit split Ir core level peaks is found to be
+larger than its atomic values and it enhances further in the bulk electronic
+structure. Such deviation from the atomic description of the core level
+spectroscopy manifests the enhancement of the orbital moment due to the solid
+state effects. The valence band spectra could be captured well within the
+density functional theory. The photon energy dependence of the features in the
+valence band spectra and their comparison with the calculated results show
+dominant Ir 5$d$ character of the features near the Fermi level; O 2$p$ peaks
+appear at higher binding energies. Interestingly, the O 2$p$ contributions of
+the feature at the Fermi level is significant and it enhances at low
+temperatures. This reveals an orbital selective enhancement of the covalency
+with cooling which is an evidence against purely spin-orbit coupling based
+scenario proposed for these systems.",2109.12330v1
+2011-05-30,Bodily tides near spin-orbit resonances,"Spin-orbit coupling can be described in two approaches. The method known as
+""the MacDonald torque"" is often combined with an assumption that the quality
+factor Q is frequency-independent. This makes the method inconsistent, because
+the MacDonald theory tacitly fixes the rheology by making Q scale as the
+inverse tidal frequency.
+  Spin-orbit coupling can be treated also in an approach called ""the Darwin
+torque"". While this theory is general enough to accommodate an arbitrary
+frequency-dependence of Q, this advantage has not yet been exploited in the
+literature, where Q is assumed constant or is set to scale as inverse tidal
+frequency, the latter assertion making the Darwin torque equivalent to a
+corrected version of the MacDonald torque.
+  However neither a constant nor an inverse-frequency Q reflect the properties
+of realistic mantles and crusts, because the actual frequency-dependence is
+more complex. Hence the necessity to enrich the theory of spin-orbit
+interaction with the right frequency-dependence. We accomplish this programme
+for the Darwin-torque-based model near resonances. We derive the
+frequency-dependence of the tidal torque from the first principles, i.e., from
+the expression for the mantle's compliance in the time domain. We also explain
+that the tidal torque includes not only the secular part, but also an
+oscillating part.
+  We demonstrate that the lmpq term of the Darwin-Kaula expansion for the tidal
+torque smoothly goes through zero, when the secondary traverses the lmpq
+resonance (e.g., the principal tidal torque smoothly goes through nil as the
+secondary crosses the synchronous orbit).
+  We also offer a possible explanation for the unexpected frequency-dependence
+of the tidal dissipation rate in the Moon, discovered by LLR.",1105.6086v9
+2020-02-13,"Multipolar magnetism in d-orbital systems: Crystal field levels, octupolar order, and orbital loop currents","Quantum magnets with spin $J=2$, which arise in spin-orbit coupled Mott
+insulators, can potentially display multipolar orders. We carry out an exact
+diagonalization study of a simple octahedral crystal field Hamiltonian for two
+electrons, incorporating spin-orbit coupling (SOC) and interactions, finding
+that either explicitly including the $e_g$ orbitals, or going beyond the
+rotationally invariant Coulomb interaction within the $t_{2g}$ sector, causes a
+degeneracy breaking of the $J\!=\!2$ level degeneracy. This can lead to a
+low-lying non-Kramers doublet carrying quadrupolar and octupolar moments and an
+excited triplet which supports magnetic dipole moments, bolstering our previous
+phenomenological proposal for the stabilization of ferro-octupolar order in
+heavy transition metal oxides. We show that the spontaneous time-reversal
+symmetry breaking due to ferro-octupolar ordering within the non-Kramers
+doublet leads to electronic orbital loop currents. The resulting internal
+magnetic fields can potentially explain the small fields inferred from
+muon-spin relaxation ($\mu$SR) experiments on cubic $5d^2$ osmate double
+perovskites Ba$_2$ZnOsO$_6$, Ba$_2$CaOsO$_6$, and Ba$_2$MgOsO$_6$, which were
+previously attributed to weak dipolar magnetism. We make further predictions
+for oxygen NMR experiments on these materials. We also study the reversed level
+scheme, where the $J\!=\!2$ multiplet splits into a low-lying magnetic triplet
+and excited non-Kramers doublet, presenting single-ion results for the magnetic
+susceptibility in this case, and pointing out its possible relevance for the
+rhenate Ba$_2$YReO$_6$. Our work highlights the intimate connection between the
+physics of heavy transition metal oxides and that of $f$-electron based heavy
+fermion compounds.",2002.05737v2
+2023-06-27,Chemical bond analysis for the entire periodic table: Energy Decomposition and Natural Orbitals for Chemical Valence in the Four-Component Relativistic Framework,"Chemical bonding is a ubiquitous concept in chemistry and it provides a
+common basis for experimental and theoretical chemists to explain and predict
+the structure, stability and reactivity of chemical species. Among others, the
+Energy Decomposition Analysis (EDA, also known as the Extended Transition State
+method) in combination with Natural Orbitals for Chemical Valence (EDA-NOCV) is
+a very powerful tool for the analysis of the chemical bonds based on a charge
+and energy decomposition scheme within a common theoretical framework. While
+the approach has been applied in a variety of chemical contexts, the current
+implementations of the EDA-NOCV scheme include relativistic effects only at
+scalar level, so simply neglecting the spin-orbit coupling effects and de facto
+limiting its applicability. In this work, we extend the EDA-NOCV method to the
+relativistic four-component Dirac-Kohn-Sham theory that variationally accounts
+for spin-orbit coupling. Its correctness and numerical stability have been
+demonstrated in the case of simple molecular systems, where the relativistic
+effects play a negligible role, by comparison with the implementation available
+in the ADF modelling suite (using the non-relativistic Hamiltonian and the
+scalar ZORA approximation). As an illustrative example we analyse the
+metal-ethylene coordination bond in the group 6-element series
+(CO)$_5$TM-C$_2$H$_4$, with TM =Cr, Mo, W, Sg, where relativistic effects are
+likely to play an increasingly important role as one moves down the group. The
+method provides a clear measure (also in combination with the CD analysis) of
+the donation and back-donation components in coordination bonds, even when
+relativistic effects, including spin-orbit coupling, are crucial for
+understanding the chemical bond involving heavy and superheavy atoms.",2306.15386v1
+2023-09-20,"Orbit-Spin Coupling, the Solar Dynamo, and the Planetary Theory of Sunspots","Orbit spin coupling is proposed as an alternative to planetary tidal models
+for the excitation of solar variability as a function of time. Momentum sourced
+from the orbital angular momenta of solar system bodies is deposited within the
+circulating fluid envelopes of the Sun and planets in this hypothesis. A
+reversing torque acts about an axis lying within the Sun's equatorial plane.
+The torque gives rise to tangential differential accelerations of solar
+materials as a function of longitude, latitude, depth, and time. The
+accelerations pulse in amplitude, and change sign, on timescales corresponding
+to the periods, beats, and harmonics of inner and outer planet orbital motions.
+In contrast to planetary tidal models, no special amplification mechanism may
+be required, as estimated peak accelerations are about 2 orders of magnitude
+larger than the largest tidal accelerations. Organized mass motions driven by
+the torque may be incorporated in dynamo simulations through the flow velocity
+term of the MHD induction equation. The spatiotemporal variability of flow
+velocities may then influence the variability with time of solar magnetic
+activity. We provide torque values at 1 day timesteps for the years 1660 to
+2220. We discuss the time variability of the torque in juxtaposition with SIDC
+monthly sunspot numbers from 1750 to present. We investigate Hale cycle
+synchronization, and the variability with time of the total solar irradiance,
+with reference to outer and inner planet contributions respectively. We propose
+a 3 component model for understanding and simulating the solar magnetic cycle,
+which includes processes internal to the Sun, external forcing, due to orbit
+spin coupling, and a time-delay, or system memory, component. This model
+supplies a physical explanation for the observed variability with time of
+Schwabe cycle periods and Hale cycle periods from 1712 to present.",2309.13076v1
+2009-04-08,First observation of spin-helical Dirac fermions and topological phases in undoped and doped Bi2Te3 demonstrated by spin-ARPES spectroscopy,"Electron systems that possess light-like dispersion relations or the conical
+Dirac spectrum, such as graphene and bismuth, have recently been shown to
+harbor unusual collective states in high magnetic fields. Such states are
+possible because their light-like electrons come in spin pairs that are
+chiral,which means that their direction of propagation is tied to a quantity
+called pseudospin that describes their location in the crystal lattice. An
+emerging direction in quantum materials research is the manipulation of atomic
+spin-orbit coupling to simulate the effect of a spin dependent magnetic
+field,in attempt to realize novel spin phases of matter. This effect has been
+proposed to realize systems consisting of unpaired Dirac cones that are
+helical, meaning their direction of propagation is tied to the electron spin
+itself, which are forbidden to exist in graphene or bismuth. The experimental
+existence of topological order can not be determined without spin-resolved
+measurements. Here we report a spin-and angle-resolved photoemission study of
+the hexagonal surface of the Bi2Te3 and Bi{2-x}MnxTe3 series, which is found to
+exhibit a single helical Dirac cone that is fully spin-polarized. Our
+observations of a gap in the bulk spin-degenerate band and a spin-resolved
+surface Dirac node close to the chemical potential show that the low energy
+dynamics of Bi2Te3 is dominated by the unpaired spin-helical Dirac modes. Our
+spin-texture measurements prove the existence of a rare topological phase in
+this materials class for the first time, and suggest its suitability for novel
+2D Dirac spin device applications beyond the chiral variety or traditional
+graphene.",0904.1260v1
+2006-09-08,Nonlocal spin Hall effect and spin-orbit interaction in nonmagnetic metals,"Spin Hall effect in a nonlocal spin-injection device is theoretically
+studied. Using a nonlocal spin-injection technique, a pure spin current is
+created in a nonmagnetic metal (N). The spin current flowing in N is deflected
+by spin-orbit scattering to induce the Hall current in the transverse direction
+and accumulate charge at the edges of N, yielding the spin-current induced Hall
+effect. We propose a method for extracting information for spin-orbit
+scattering in nonmagnetic metals.",0609192v1
+2016-12-02,Stability of topological properties of bismuth (111) bilayer,"We investigate electronic and transport properties of bismuth (111) bilayer
+in the context of stability of its topological properties against different
+perturbations. The effects of spin-orbit coupling variations, geometry
+relaxation and an interaction with a substrate are considered. Transport
+properties are studied in the presence of Anderson disorder. Band structure
+calculations are performed within multi-orbital tight-binding model and density
+functional theory methods. A band inversion process in bismuth (111) infinite
+bilayer and an evolution of edge states dispersion in ribbons as a function of
+spin-orbit coupling strength are analyzed. A significant change of orbital
+composition of the conduction and valence bands during a topological phase
+transition is observed. A topological phase is shown to be robust when the
+effect of geometry relaxation is taken into account. An interaction with a
+substrate has similar effect to an external perpendicular electric field. The
+robust quantized conductance is observed when the Fermi energy lies within the
+bulk energy gap, where only two counter-propagating edge states are present.
+For energies where the Fermi level crosses more in-gap states, a scattering is
+possible between channels lying close in $k-$space. When the energy of edge
+states overlaps with bulk states, no topological protection is observed.",1612.00647v2
+2020-09-28,Electric field induced topological phase transition and large enhancements of spin-orbit coupling and Curie temperature in two-dimensional ferromagnetic semiconductors,"Tuning topological and magnetic properties of materials by applying an
+electric field is widely used in spintronics. In this work, we find a
+topological phase transition from topologically trivial to nontrivial states at
+an external electric field of about 0.1 V/A in MnBi$_2$Te$_4$ monolayer that is
+a topologically trivial ferromagnetic semiconductor. It is shown that when
+electric field increases from 0 to 0.15 V/A, the magnetic anisotropy energy
+(MAE) increases from about 0.1 to 6.3 meV, and the Curie temperature Tc
+increases from 13 to about 61 K. The increased MAE mainly comes from the
+enhanced spin-orbit coupling due to the applied electric field. The enhanced Tc
+can be understood from the enhanced $p$-$d$ hybridization and decreased energy
+difference between $p$ orbitals of Te atoms and $d$ orbitals of Mn atoms.
+Moreover, we propose two novel Janus materials MnBi$_2$Se$_2$Te$_2$ and
+MnBi$_2$S$_2$Te$_2$ monolayers with different internal electric polarizations,
+which can realize quantum anomalous Hall effect (QAHE) with Chern numbers $C$=1
+and $C$=2, respectively. Our study not only exposes the electric field induced
+exotic properties of MnBi2Te4 monolayer, but also proposes novel materials to
+realize QAHE in ferromagnetic Janus semiconductors with electric polarization.",2009.13328v2
+2022-09-14,Moiré Engineering and Topological Flat Bands in Twisted Orbital-Active Bilayers,"Topological flat bands at the Fermi level offer a promising platform to study
+a variety of intriguing correlated phase of matter. Here we present band
+engineering in the twisted orbital-active bilayers with spin-orbit coupling.
+The symmetry constraints on the interlayer coupling that determines the
+effective potential for low-energy physics of moir\'e electrons are
+exhaustively derived for two-dimensional point groups. We find the line graph
+or biparticle sublattice of moir\'e pattern emerge with a minimal $C_3$
+symmetry, which exhibit isolated electronic flat bands with nontrivial
+topology. The band flatness is insensitive to the twist angle since they come
+from the interference effect. Armed with this guiding principle, we predict
+that twisted bilayers of 2H-PbS$_2$ and CdS realize the salient physics to
+engineer two-dimensional topological quantum phases. At small twist angles,
+PbS$_2$ heterostructures give rise to an emergent moir\'e Kagom\'e lattice,
+while CdS heterostructures lead to an emergent moir\'e honeycomb lattice, and
+both of them host moir\'e quantum spin Hall insulators with almost flat
+topological bands. We further study superconductivity of these two systems with
+local attractive interactions. The superfluid weight and
+Berezinskii-Kosterlitz-Thouless temperature are determined by multiband
+processes and quantum geometry of the band in the flat-band limit when the
+pairing potential exceeds the band width. Our results demonstrate twisted
+bilayers with multi-orbitals as a promising tunable platform to realize
+correlated topological phases.",2209.06524v1
+2023-04-07,Tight-binding model with sublattice-asymmetric spin-orbit coupling for square-net nodal line Dirac semimetals,"We study a 4-orbital tight-binding (TB) model for ZrSiS from the square
+sublattice generated by the Si atoms. After studying three other alternatives,
+we endow such model with a new effective spin-orbit coupling (SOC) consistent
+with {\em ab initio} dispersions around the Fermi energy ($E_F$) in four
+systematic steps: (1) We calculate the electronic dispersion of bulk ZrSiS
+using an implementation of density-functional theory (DFT) based on numeric
+atomic orbitals [{\em J. Phys.: Condens. Matter} {\bf 14}, 2745 (2002)] in
+which on-site and off-site SOC can be told apart. As a result, we determine
+that local SOC-induced band gaps around $E_F$ are predominantly created by the
+on-site contribution. (2) Gradually reducing the atomic basis set size, we then
+create an electronic band structure with 16 orbitals per unit cell (u.c.) which
+retains the qualitative features of the dispersion around $E_F$, including
+SOC-induced band gaps. (3) Zr is the heaviest element on this compound and it
+has a non-negligible contribution to the electronic dispersion around $E_F$; we
+show that it provides the strongest contribution to the SOC-induced band gap.
+(4) Using L\""{o}wdin partitioning approach, we project the effect of SOC onto
+the 4-orbital Hamiltonian. This way, we facilitate an effective SOC interaction
+that was explicitly informed by {\em ab initio} input.",2304.03438v3
+2015-06-27,Theory of the nonlinear Rashba-Edelstein effect,"It is well known that a current driven through a two-dimensional electron gas
+with Rashba spin-orbit coupling induces a spin polarization in the
+perpendicular direction (Edelstein effect). This phenomenon has been
+extensively studied in the linear response regime, i.e., when the average drift
+velocity of the electrons is a small fraction of the Fermi velocity. Here we
+investigate the phenomenon in the nonlinear regime, meaning that the average
+drift velocity is comparable to, or exceeds the Fermi velocity. This regime is
+realized when the electric field is very large, or when electron-impurity
+scattering is very weak. The quantum kinetic equation for the density matrix of
+noninteracting electrons is exactly and analytically solvable, reducing to a
+problem of spin dynamics for ""unpaired"" electrons near the Fermi surface. The
+crucial parameter is $\gamma=eEL_s/E_F$, where $E$ is the electric field, $e$
+is the absolute value of the electron charge, $E_F$ is the Fermi energy, and
+$L_s = \hbar/(2m\alpha)$ is the spin-precession length in the Rashba spin-orbit
+field with coupling strength $\alpha$. If $\gamma\ll1$ the evolution of the
+spin is adiabatic, resulting in a spin polarization that grows monotonically in
+time and eventually saturates at the maximum value $n(\alpha/v_F)$, where $n$
+is the electron density and $v_F$ is the Fermi velocity. If $\gamma \gg 1$ the
+evolution of the spin becomes strongly non-adiabatic and the spin polarization
+is progressively reduced, and eventually suppressed for $\gamma\to \infty$. We
+also predict an inverse nonlinear Edelstein effect, in which an electric
+current is driven by a magnetic field that grows linearly in time. The
+""conductivities"" for the direct and the inverse effect satisfy generalized
+Onsager reciprocity relations, which reduce to the standard ones in the linear
+response regime.",1506.08330v1
+2012-01-06,Antiferromagnetic order and domains in Sr3Ir2O7 probed by x-ray resonant scattering,"This article reports a detailed x-ray resonant scattering study of the
+bilayer iridate compound, Sr3Ir2O7, at the Ir L2 and L3 edges. Resonant
+scattering at the Ir L3 edge has been used to determine that Sr3Ir2O7 is a
+long-range ordered antiferromagnet below TN 230K with an ordering wavevector,
+q=(1/2,1/2,0). The energy resonance at the L3 edge was found to be a factor of
+~30 times larger than that at the L2. This remarkable effect has been seen in
+the single layer compound Sr2IrO4 and has been linked to the observation of a
+Jeff=1/2 spin-orbit insulator. Our result shows that despite the modified
+electronic structure of the bilayer compound, caused by the larger bandwidth,
+the effect of strong spin-orbit coupling on the resonant magnetic scattering
+persists. Using the programme SARAh, we have determined that the magnetic order
+consists of two domains with propagation vectors k1=(1/2,1/2,0) and
+k2=(1/2,-1/2,0), respectively. A raster measurement of a focussed x-ray beam
+across the surface of the sample yielded images of domains of the order of 100
+microns size, with odd and even L components, respectively. Fully relativistic,
+monoelectronic calculations (FDMNES), using the Green's function technique for
+a muffin-tin potential have been employed to calculate the relative intensities
+of the L2,3 edge resonances, comparing the effects of including spin-orbit
+coupling and the Hubbard, U, term. A large L3 to L2 edge intensity ratio (~5)
+was found for calculations including spin-orbit coupling. Adding the Hubbard,
+U, term resulted in changes to the intensity ratio <5%.",1201.1452v1
+2012-09-22,Transport across an Anderson quantum dot in the intermediate coupling regime,"We describe linear and nonlinear transport across a single impurity Anderson
+model quantum dot with intermediate coupling to the leads, i.e., with tunnel
+coupling of the order of the thermal energy k_B T. The coupling is large enough
+that sequential tunneling processes alone do not suffice to properly describe
+the transport characteristics. Upon applying a density matrix approach, the
+current is expressed in terms of rates obtained by considering a very small
+class of diagrams which dress the sequential tunneling processes by charge
+fluctuations. We call this the ""dressed second order"" (DSO) approximation. One
+major achievement of the DSO is that, still in the Coulomb blockade regime, it
+can describe the crossover from thermally broadened to tunneling broadened
+conductance peaks. When the temperature is decreased even further, the DSO
+captures ""Kondesque"" behaviours of the Anderson quantum dot qualitatively: We
+find a zero bias anomaly of the differential conductance versus applied bias,
+an enhancement of the conductance with decreasing temperature as well as the
+onset of universality of the shape of the conductance as function of the
+temperature. We can address the case of a spin-degenerate level split
+energetically by a magnetic field and show that, if we assume in addition
+different capacitive couplings of the two spin-levels to the leads, one of the
+resonance peaks is vanishing. In case spin-dependent chemical potentials are
+introduced and only one of the four is varied, the DSO yields in principle only
+one resonance. This seems to be in agreement with experiments with pseudo-spin.
+Furthermore, we get qualitative agreement with experimental data showing a
+cross-over from the Kondo to the empty orbital regime.",1209.4995v2
+2016-01-25,Duo: a general program for calculating spectra of diatomic molecules,"Duo is a general, user-friendly program for computing rotational,
+rovibrational and rovibronic spectra of diatomic molecules. Duo solves the
+Schr\""{o}dinger equation for the motion of the nuclei not only for the simple
+case of uncoupled, isolated electronic states (typical for the ground state of
+closed-shell diatomics) but also for the general case of an arbitrary number
+and type of couplings between electronic states (typical for open-shell
+diatomics and excited states). Possible couplings include spin-orbit, angular
+momenta, spin-rotational and spin-spin. Corrections due to non-adiabatic
+effects can be accounted for by introducing the relevant couplings using
+so-called Born-Oppenheimer breakdown curves.
+  Duo requires user-specified potential energy curves and, if relevant, dipole
+moment, coupling and correction curves. From these it computes energy levels,
+line positions and line intensities. Several analytic forms plus interpolation
+and extrapolation options are available for representation of the curves. Duo
+can refine potential energy and coupling curves to best reproduce reference
+data such as experimental energy levels or line positions. Duo is provided as a
+Fortran 2003 program and has been tested under a variety of operating systems.",1601.06531v2
+2018-02-22,Magnetic properties of metal-organic coordination networks based on 3d transition metal atoms,"The magnetic anisotropy and exchange coupling between spins localized at the
+positions of 3d transition metal atoms forming two-dimensional metal-organic
+coordination networks (MOCNs) grown on the Au(111) metal surface are studied.
+In particular, we consider MOCNs made of Ni or Mn metal centers linked by TCNQ
+(7,7,8,8-tetracyanoquinodimethane) organic ligands, which form rectangular
+networks with 1:1 stoichiometry. Based on the analysis of X-ray magnetic
+circular dichroism (XMCD) data taken at T= 2.5 K, we find that Ni atoms in the
+Ni-TCNQ MOCNs are coupled ferromagnetically and do not show any significant
+magnetic anisotropy, while Mn atoms in the Mn-TCNQ MOCNs are coupled
+antiferromagnetically and do show a weak magnetic anisotropy with
+in-planemagnetization. We explain these observations using both
+amodelHamiltonian based on mean-fieldWeiss theory and density functional theory
+calculations that include spin-orbit coupling. Our main conclusion is that the
+antiferromagnetic coupling between Mn spins and the in-plane magnetization of
+the Mn spins can be explained neglecting effects due to the presence of the
+Au(111) surface, while for Ni-TCNQ the metal surface plays a role in
+determining the absence of magnetic anisotropy in the system.",1802.08243v1
+1999-04-22,Orbital order out of spin disorder: How to measure the orbital gap,"The interplay between spin and orbital degrees of freedom in the Mott-Hubbard
+insulator is studied by considering an orbitally degenerate superexchange
+model. We argue that orbital order and the orbital excitation gap in this model
+are generated through the order-from-disorder mechanism known previously from
+frustrated spin models. We propose that the orbital gap should show up
+indirectly in the dynamical spin structure factor; it can therefore be measured
+using the conventional inelastic neutron scattering method.",9904318v1
+2004-02-13,Electrical current noise of a beam splitter as a test of spin-entanglement,"We investigate the spin entanglement in the superconductor-quantum dot system
+proposed by Recher, Sukhorukov and Loss, coupling it to an electronic
+beam-splitter. The superconductor-quantum dot entangler and the beam-splitter
+are treated within a unified framework and the entanglement is detected via
+current correlations. The state emitted by the entangler is found to be a
+linear superposition of non-local spin-singlets at different energies, a
+spin-entangled two-particle wavepacket. Colliding the two electrons in the
+beam-splitter, the singlet spin-state gives rise to a bunching behavior,
+detectable via the current correlators. The amount of bunching depends on the
+relative positions of the single particle levels in the quantum dots and the
+scattering amplitudes of the beam-splitter. The singlet spin entanglement,
+insensitive to orbital dephasing but suppressed by spin dephasing, is
+conveniently quantified via the Fano factors. It is found that the
+entanglement-dependent contribution to the Fano factor is of the same magnitude
+as the non-entangled, making an experimental detection feasible. A detailed
+comparison between the current correlations of the non-local spin-singlet state
+and other states, possibly emitted by the entangler, is performed. This
+provides conditions for an unambiguous identification of the non-local singlet
+spin entanglement.",0402368v2
+2006-06-14,Time Reversal Polarization and a Z_2 Adiabatic Spin Pump,"We introduce and analyze a class of one dimensional insulating Hamiltonians
+which, when adiabatically varied in an appropriate closed cycle, define a
+""$Z_2$ pump"". For an isolated system a single closed cycle of the pump changes
+the expectation value of the spin at each end even when spin orbit interactions
+violate the conservation of spin. A second cycle, however returns the system to
+its original state. When coupled to leads, we show that the $Z_2$ pump
+functions as a spin pump in a sense which we define, and transmits a finite,
+though non quantized spin in each cycle. We show that the $Z_2$ pump is
+characterized by a $Z_2$ topological invariant that is analogous to the Chern
+invariant that characterizes a topological charge pump. The $Z_2$ pump is
+closely related to the quantum spin Hall effect, which is characterized by a
+related $Z_2$ invariant. This work presents an alternative formulation which
+clarifies both the physical and mathematical meaning of that invariant. A
+crucial role is played by time reversal symmetry, and we introduce the concept
+of the time reversal polarization, which characterizes time reversal invariant
+Hamiltonians and signals the presence or absence of Kramers degenerate end
+states. For non interacting electrons we derive a formula for the time reversal
+polarization which is analogous to the Berry's phase formulation of the charge
+polarization. For interacting electrons, we show that abelian bosonization
+provides a simple formulation of the time reversal polarization. We discuss
+implications for the quantum spin Hall effect, and argue in particular that the
+$Z_2$ classification of the quantum spin Hall effect is valid in the presence
+of electron electron interactions.",0606336v1
+2006-08-18,Spin diffusion/transport in $n$-type GaAs quantum wells,"The spin diffusion/transport in $n$-type (001) GaAs quantum well at high
+temperatures ($\ge120$ K) is studied by setting up and numerically solving the
+kinetic spin Bloch equations together with the Poisson equation
+self-consistently. All the scattering, especially the electron-electron Coulomb
+scattering, is explicitly included and solved in the theory. This enables us to
+study the system far away from the equilibrium, such as the hot-electron effect
+induced by the external electric field parallel to the quantum well. We find
+that the spin polarization/coherence oscillates along the transport direction
+even when there is no external magnetic field. We show that when the scattering
+is strong enough, electron spins with different momentums oscillate in the same
+phase which leads to equal transversal spin injection length and ensemble
+transversal injection length. It is also shown that the intrinsic scattering is
+already strong enough for such a phenomena. The oscillation period is almost
+independent on the external electric field which is in agreement with the
+latest experiment in bulk system at very low temperature [Europhys. Lett. {\bf
+75}, 597 (2006)]. The spin relaxation/dephasing along the diffusion/transport
+can be well understood by the inhomogeneous broadening, which is caused by the
+momentum-dependent diffusion and the spin-orbit coupling, and the scattering.
+The scattering, temperature, quantum well width and external magnetic/electric
+field dependence of the spin diffusion is studied in detail.",0608413v2
+2005-08-16,Transition from inspiral to plunge in precessing binaries of spinning black holes,"We investigate the non-adiabatic dynamics of spinning black hole binaries by
+using an analytical Hamiltonian completed with a radiation-reaction force,
+containing spin couplings, which matches the known rates of energy and angular
+momentum losses on quasi-circular orbits. We consider both a straightforward
+post-Newtonian-expanded Hamiltonian (including spin-dependent terms), and a
+version of the resummed post-Newtonian Hamiltonian defined by the Effective
+One-Body approach. We focus on the influence of spin terms onto the dynamics
+and waveforms. We evaluate the energy and angular momentum released during the
+final stage of inspiral and plunge. For an equal-mass binary the energy
+released between 40Hz and the frequency beyond which our analytical treatment
+becomes unreliable is found to be, when using the more reliable Effective
+One-Body dynamics: 0.6% M for anti-aligned maximally spinning black holes, 5% M
+for aligned maximally spinning black hole, and 1.8% M for non-spinning
+configurations. In confirmation of previous results, we find that, for all
+binaries considered, the dimensionless rotation parameter J/E^2 is always
+smaller than unity at the end of the inspiral, so that a Kerr black hole can
+form right after the inspiral phase. By matching a quasi-normal mode ringdown
+to the last reliable stages of the plunge, we construct complete waveforms
+approximately describing the gravitational wave signal emitted by the entire
+process of coalescence of precessing binaries of spinning black holes.",0508067v1
+2008-05-20,ADM canonical formalism for gravitating spinning objects,"In general relativity, systems of spinning classical particles are
+implemented into the canonical formalism of Arnowitt, Deser, and Misner [1].
+The implementation is made with the aid of a symmetric stress-energy tensor and
+not a 4-dimensional covariant action functional. The formalism is valid to
+terms linear in the single spin variables and up to and including the
+next-to-leading order approximation in the gravitational spin-interaction part.
+The field-source terms for the spinning particles occurring in the Hamiltonian
+are obtained from their expressions in Minkowski space with canonical variables
+through 3-dimensional covariant generalizations as well as from a suitable
+shift of projections of the curved spacetime stress-energy tensor originally
+given within covariant spin supplementary conditions. The applied coordinate
+conditions are the generalized isotropic ones introduced by Arnowitt, Deser,
+and Misner. As applications, the Hamiltonian of two spinning compact bodies
+with next-to-leading order gravitational spin-orbit coupling, recently obtained
+by Damour, Jaranowski, and Schaefer [2], is rederived and the derivation of the
+next-to-leading order gravitational spin(1)-spin(2) Hamiltonian, shown for the
+first time in [3], is presented.",0805.3136v2
+2010-04-05,Electron spin relaxation in graphene from a microscopic approach: Role of electron-electron interaction,"Electron spin relaxation in graphene on a substrate is investigated from the
+fully microscopic kinetic spin Bloch equation approach. All the relevant
+scatterings, such as the electron-impurity, electron--acoustic-phonon,
+electron--optical-phonon, electron--remote-interfacial-phonon, as well as
+electron-electron Coulomb scatterings, are explicitly included. Our study
+concentrates on clean intrinsic graphene, where the spin-orbit coupling from
+the adatoms can be neglected. We discuss the effect of the electron-electron
+Coulomb interaction on spin relaxation under various conditions. It is shown
+that the electron-electron Coulomb scattering plays an important role in spin
+relaxation at high temperature. We also find a significant increase of the spin
+relaxation time for high spin polarization even at room temperature, which is
+due to the Coulomb Hartree-Fock contribution-induced effective longitudinal
+magnetic field. It is also discovered that the spin relaxation time increases
+with the in-plane electric field due to the hot-electron effect, which is
+different from the non-monotonic behavior in semiconductors. Moreover, we show
+that the electron-electron Coulomb scattering in graphene is not strong enough
+to establish the steady-state hot-electron distribution in the literature and
+an alternative approximate one is proposed based on our computation.",1004.0638v2
+2010-09-15,Mesoscopic spin Hall effect along a potential step in graphene,"We consider a straight one-dimensional potential step created across a
+graphene flake. Charge and spin transport through such a potential step are
+studied in the presence of both intrinsic and extrinsic (Rashba) spin-orbit
+coupling (SOC). At normal incidence electrons are completely reflected when the
+Rashba interaction (with strength $\lambda_R$) is dominant whereas they are
+perfectly transmitted if the two types of SOC are exactly balanced. At normal
+incidence, the transmission probability of the step is thus controlled
+continuously from 0 to 1 by tuning the ratio of the two types of SOC. Besides
+the transport of charge in the direction normal to the barrier, we show the
+existence of a spin transport along the barrier. The magnitude of the spin Hall
+current is determined by a subtle interplay between the height of the potential
+step and the position of Fermi energy. It is demonstrated that contributions
+from inter-band matrix elements and evanescent modes are dominant in spin
+transport. Moreover, in the case of vanishing extrinsic SOC ($\lambda_R =0$),
+each channel carries a conserved spin current, in contrast to the general case
+of a finite $\lambda_R$, in which only integrated spin current is a conserved
+quantity. Finally, we provide a quasi-classical picture of the charge and spin
+transport by imaging flow lines over the entire sample and Veselago lensing
+(negative refraction) in the case of a $p-n$ junction.",1009.2842v1
+2010-12-06,Electric manipulation of electron spin relaxation induced by confined phonons in nanowire-based double quantum dots,"We investigate theoretically the electron spin relaxation in single-electron
+nanowire-based semiconductor double quantum dots induced by confined phonons
+and find that the electron spin relaxation rate can be efficiently manipulated
+by external electric fields in such system. An anti-crossing, due to the
+coaction of the electric field, the magnetic field and the spin-orbit coupling,
+exists between the lowest two excited states. Both energies and spins of the
+electron states can be efficiently tuned by the electric field around the
+anti-crossing point. Multiple sharp peaks exist in the electric-field
+dependence of the spin relaxation rate induced by the confined phonons, which
+can be ascribed to the large density of states of the confined phonons at the
+van Hove singularities. This feature suggests that the nanowire-based double
+quantum dots can be used as electric tunable on-and-off spin switches, which
+are more sensitive and flexible than the ones based on quantum-well based
+double quantum dots. The temperature dependence of the spin relaxation rate at
+the anti-crossing point are calculated and a smooth peak, indicating the
+importance of the contribution of the off-diagonal elements of the density
+matrix to the spin relaxation, is observed.",1012.1074v1
+2013-01-16,Self-induced inverse spin Hall effect in permalloy at room temperature,"Inverse spin Hall effect (ISHE) allows the conversion of pure spin current
+into charge current in nonmagnetic materials (NM) due to spin-orbit interaction
+(SOI). In ferromagnetic materials (FM), SOI is known to contribute to anomalous
+Hall effect (AHE), anisotropic magnetoresistance (AMR), and other
+spin-dependent transport phenomena. However, SOI in FM has been ignored in ISHE
+studies in spintronic devices, and the possibility of ""self-induced ISHE"" in FM
+has never been explored until now. In this paper, we demonstrate the
+experimental verification of ISHE in FM. We found that the spin-pumping-induced
+spin current in permalloy (Py) film generates a transverse electromotive force
+(EMF) in the film itself, which results from the coupling of spin current and
+SOI in Py. The control experiments ruled out spin rectification effect and
+anomalous Nernst effect as the origin of the EMF.",1301.3580v5
+2014-11-18,Spin transfer torques generated by the anomalous Hall effect and anisotropic magnetoresistance,"Spin-orbit coupling in ferromagnets gives rise to the anomalous Hall effect
+and the anisotropic magnetoresistance, both of which can be used to create
+spin-transfer torques in a similar manner as the spin Hall effect. In this
+paper we show how these effects can be used to reliably switch perpendicularly
+magnetized layers and to move domain walls. A drift-diffusion treatment of the
+anomalous Hall effect and the anisotropic magnetoresistance describes the spin
+currents that flow in directions perpendicular to the electric field. In
+systems with two ferromagnetic layers separated by a spacer layer, an in-plane
+electric field cause spin currents to be injected from one layer into the
+other, creating spin transfer torques. Unlike the related spin Hall effect in
+non-magnetic materials, the anomalous Hall effect and the anisotropic
+magnetoresistance allow control of the orientation of the injected spins, and
+hence torques, by changing the direction of the magnetization in the injecting
+layer. The torques on one layer show a rich angular dependence as a function of
+the orientation of the magnetization in the other layer. The control of the
+torques afforded by changing the orientation of the magnetization in a fixed
+layer makes it possible to reliably switch a perpendicularly magnetized free
+layer. Our calculated critical current densities for a representative
+CoFe/Cu/FePt structure show that the switching can be efficient for appropriate
+material choices. Similarly, control of the magnetization direction can drive
+domain wall motion, as shown for NiFe/Cu/NiFe structures.",1411.4863v1
+2015-03-23,Strong mechanical driving of a single electron spin,"Quantum devices for sensing and computing applications require coherent
+quantum systems which can be manipulated in a fast and robust way. Such quantum
+control is typically achieved using external electric or magnetic fields which
+drive the system's orbital or spin degrees of freedom. However, most of these
+approaches require complex and unwieldy antenna or gate structures, and with
+few exceptions are limited to the regime of weak driving. Here, we present a
+novel approach to strongly and coherently drive a single electron spin in the
+solid state using internal strain fields in an integrated quantum device.
+Specifically, we study individual Nitrogen-Vacancy (NV) spins embedded in
+diamond mechanical oscillators and exploit the intrinsic strain coupling
+between spin and oscillator to strongly drive the spins. As hallmarks of the
+strong driving regime, we directly observe the energy spectrum of the emerging
+phonon-dressed states and employ our strong, continuous driving for enhancement
+of the NV spin coherence time. Our results constitute a first step towards
+strain-driven, integrated quantum devices and open new perspectives to
+investigate unexplored regimes of strongly driven multi-level systems and to
+study exotic spin dynamics in hybrid spin-oscillator devices.",1503.06793v1
+2015-04-03,Out-of-Plane Spin-Orientation Dependent Magnetotransport Properties in the Anisotropic Helimagnet Cr$_{1/3}$NbS$_2$,"Understanding the role of spin-orbit coupling (SOC) has been crucial to
+controlling magnetic anisotropy in magnetic multilayer films. It has been shown
+that electronic structure can be altered via interface SOC by varying the
+superlattice structure, resulting in spontaneous magnetization perpendicular or
+parallel to the plane. In lieu of magnetic thin films, we study the similarly
+anisotropic helimagnet Cr$_{1/3}$NbS$_2$, where the spin polarization
+direction, controlled by the applied magnetic field, can modify the electronic
+structure. As a result, the direction of spin polarization can modulate the
+density of states, and in turn affect the in-plane electrical conductivity. In
+Cr$_{1/3}$NbS$_2$, we found an enhancement of in-plane conductivity when the
+spin polarization is out-of-plane, as compared to in-plane spin polarization.
+This is consistent with the increase of density of states near the Fermi energy
+at the same spin configuration, found from first principles calculations. We
+also observe unusual field dependence of the Hall signal in the same
+temperature range. This is unlikely to originate from the non-collinear spin
+texture, but rather further indicates strong dependence of electronic structure
+on spin orientation relative to the plane.",1504.00916v1
+2014-03-25,Kondo screening of spin-charge separated fluxons by a helical liquid,"The insertion of a magnetic $\pi$ flux into a quantum spin Hall insulator
+creates four localized, spin-charge separated states: the charge and spin
+fluxons with either charge $Q=\pm1$ or spin $S_z=\pm1/2$, respectively. In the
+presence of repulsive Coulomb interactions, the charged states are gapped out
+and a local moment is formed. We consider the Kane-Mele-Hubbard model on a
+ribbon with zigzag edges to construct an impurity model where the spin fluxon
+is screened by the helical edge liquid. In the noninteracting model, the
+hybridization between fluxon and edge states is dominated by the extent of the
+latter. It becomes larger with increasing spin-orbit coupling $\lambda$ but
+only has nonzero values for even distances between the $\pi$ flux and the edge.
+For the interacting system, we use the continuous-time quantum Monte Carlo
+method, which we have extended by global susceptibility measurements to
+reproduce the characteristic Curie law of the spin fluxon. However, due to the
+finite extent of the fluxons, the local moment is formed at rather low
+energies. The screening of the spin fluxon leads to deviations from the Curie
+law that follow the universal behavior obtained from a data collapse.
+Additionally, the Kondo resonance arises in the local spectral function between
+the two low-lying Hubbard peaks.",1403.6372v2
+2013-09-23,Zinc Oxide - From Dilute Magnetic Doping to Spin Transport,"During the past years there has been renewed interest in the wide-bandgap
+II-VI semiconductor ZnO, triggered by promising prospects for spintronic
+applications. First, ferromagnetism was predicted for dilute magnetic doping.
+In comprehensive investigation of ZnO:Co thin films based on the combined
+measurement of macroscopic and microscopic properties, we find no evidence for
+carrier-mediated itinerant ferromagnetism. Phase-pure, crystallographically
+excellent ZnO:Co is uniformly paramagnetic. Superparamagnetism arises when
+phase separation or defect formation occurs, due to nanometer-sized metallic
+precipitates. Other compounds like ZnO:(Li,Ni) and ZnO:Cu do not exhibit
+indication of ferromagnetism.
+  Second, its small spin-orbit coupling and correspondingly large spin
+coherence length makes ZnO suitable for transporting or manipulating spins in
+spintronic devices. From optical pump/optical probe experiments, we find a spin
+dephasing time of the order of 15 ns at low temperatures which we attribute to
+electrons bound to Al donors. In all-electrical magnetotransport measurements,
+we successfully create and detect a spin-polarized ensemble of electrons and
+transport this spin information across several nanometers. We derive a spin
+lifetime of 2.6 ns for these itinerant spins at low temperatures, corresponding
+well to results from an electrical pump/optical probe experiment.",1309.5857v1
+2017-12-14,Interaction Approach to Anomalous Spin Texture in Warped Topological Insulators,"Interactions between the surface and the bulk in a strong topological
+insulator (TI) cause a finite lifetime of the topological surface states (TSS)
+as shown by the recent experiments. On the other hand, interactions also induce
+unitary processes, which, in the presence of anisotropy and the spin-orbit
+coupling (SOC), can induce non-trivial effects on the spin texture. Recently,
+such effects were observed experimentally in the $Bi_2X_3$ family, raising the
+question that the hexagonal warping (HW) may be linked with new spin-related
+anomalies. The most remarkable among which is the 6-fold periodic canting of
+the in-plane spin vector. Here, we show that, this anomaly is the result of a
+{\it triple cooperation between the interactions, the SOC and the HW}. To
+demonstrate it, we formulate the spin-off-diagonal self energy. A unitary phase
+with an even symmetry develops in the latter and modulates the spin-1/2 vortex
+when the Fermi surface is anisotropic. When the anisotropy is provided by the
+HW, a 6-fold in-plane spin-canting is observed. Our theory suggests that the
+spin-canting anomaly in $Bi_2X_3$ is a strong evidence of the interactions.
+High precision analysis of the spin-texture is a promising support for further
+understanding of the interactions in TIs.",1712.05140v3
+2019-07-30,Universal spin diffusion length in polycrystalline graphene,"Graphene grown by chemical vapor deposition (CVD) is the most promising
+material for industrial-scale applications based on graphene monolayers. It
+also holds promise for spintronics; despite being polycrystalline, spin
+transport in CVD graphene has been measured over lengths up to 30 $\mu$m, which
+is on par with the best measurements made in single-crystal graphene. These
+results suggest that grain boundaries (GBs) in CVD graphene, while impeding
+charge transport, may have little effect on spin transport. However, to date
+very little is known about the true impact of disordered networks of GBs on
+spin relaxation. Here, by using first-principles simulations, we derive an
+effective tight-binding model of graphene GBs in the presence of spin-orbit
+coupling (SOC), which we then use to evaluate spin transport in realistic
+morphologies of polycrystalline graphene. The spin diffusion length is found to
+be independent of the grain size, and is determined only by the strength of the
+substrate-induced SOC. This result is consistent with the D'yakonov-Perel'
+mechanism of spin relaxation in the diffusive regime, but we find that it also
+holds in the presence of quantum interference. These results clarify the role
+played by GBs and demonstrate that the average grain size does not dictate the
+upper limit for spin transport in CVD-grown graphene, a result of fundamental
+importance for optimizing large-scale graphene-based spintronic devices.",1907.12761v2
+2020-01-11,Materials design of Kitaev spin liquids beyond the Jackeli-Khaliullin mechanism,"The Kitaev spin liquid provides a rare example of well-established quantum
+spin liquids in more than one dimension. It is obtained as the exact ground
+state of the Kitaev spin model with bond-dependent anisotropic interactions.
+The peculiar interactions can be yielded by the synergy of spin-orbit coupling
+and electron correlations for specific electron configuration and lattice
+geometry, which is known as the Jackeli-Khaliullin mechanism. Based on this
+mechanism, there has been a fierce race for the materialization of the Kitaev
+spin liquid over the last decade, but the candidates have been still limited
+mostly to $4d$- and $5d$-electron compounds including cations with the low-spin
+$d^5$ electron configuration, such as Ir$^{4+}$ and Ru$^{3+}$. Here we discuss
+recent efforts to extend the material perspective beyond the Jackeli-Khaliullin
+mechanism, by carefully reexamining the two requisites, formation of the
+$j_{\rm eff}=1/2$ doublet and quantum interference between the exchange
+processes, for not only $d$- but also $f$-electron systems. We present three
+examples: the systems including Co$^{2+}$ and Ni$^{3+}$ with the high-spin
+$d^7$ electron configuration, Pr$^{4+}$ with the $f^1$-electron configuration,
+and polar asymmetry in the lattice structure. In particular, the latter two are
+intriguing since they may realize the antiferromagnetic Kitaev interactions, in
+contrast to the ferromagnetic ones in the existing candidates. This partial
+overview would stimulate further material exploration of the Kitaev spin
+liquids and its topological properties due to fractional excitations.",2001.03731v2
+2012-05-11,Optical effects of spin currents in semiconductors,"A spin current has novel linear and second-order nonlinear optical effects
+due to its symmetry properties. With the symmetry analysis and the eight-band
+microscopic calculation we have systematically investigated the interaction
+between a spin current and a polarized light beam (or the ""photon spin
+current"") in direct-gap semiconductors. This interaction is rooted in the
+intrinsic spin-orbit coupling in valence bands and does not rely on the Rashba
+or Dresselhaus effect. The light-spin current interaction results in an optical
+birefringence effect of the spin current. The symmetry analysis indicates that
+in a semiconductor with inversion symmetry, the linear birefringence effect
+vanishes and only the circular birefringence effect exists. The circular
+birefringence effect is similar to the Faraday rotation in magneto-optics but
+involves no net magnetization nor breaking the time-reversal symmetry.
+Moreover, a spin current can induce the second-order nonlinear optical
+processes due to the inversion-symmetry breaking. These findings form a basis
+of measuring a pure spin current where and when it flows with the standard
+optical spectroscopy, which may provide a toolbox to explore a wealth of
+physics connecting the spintronics and photonics.",1205.2592v1
+2018-03-07,Magnetoresistance in Hybrid Pt/CoFe2O4 Bilayers Controlled by Competing Spin Accumulation and Interfacial Chemical Reconstruction,"Pure spin currents hold promises for an energy-friendlier spintronics. They
+can be generated by a flow of charge along a non-magnetic metal having a large
+spin-orbit coupling. It produces a spin accumulation at its surfaces,
+controllable by the magnetization of an adjacent ferromagnetic layer.
+Paramagnetic metals typically used are close to a ferromagnetic instability and
+thus magnetic proximity effects can contribute to the observed
+angular-dependent magnetoresistance (ADMR). As interface phenomena govern the
+spin conductance across the metal/ferromagnetic-insulator heterostructures,
+unraveling these distinct contributions is pivotal to full understanding of
+spin current conductance. We report here x-ray absorption and magnetic circular
+dichroism (XMCD) at Pt-M and (Co,Fe)-L absorption edges and atomically-resolved
+energy loss electron spectroscopy (EELS) data of Pt/CoFe2O4 bilayers where
+CoFe2O4 layers have been capped by Pt grown at different temperatures. It turns
+out that the ADMR differs dramatically, being either dominated by spin Hall
+magnetoresistance (SMR) associated to spin Hall effect or anisotropic
+magnetoresistance (AMR). The XMCD and EELS data indicate that the Pt layer
+grown at room temperature does not display any magnetic moment, whereas when
+grown at higher temperature it is magnetic due to interfacial Pt-(Co,Fe)
+alloying. These results allow disentangling spin accumulation from interfacial
+chemical reconstructions and for tailoring the angular dependent
+magnetoresistance.",1803.02611v1
+2018-06-25,Spin relaxation due to the D'yakonov-Perel' mechanism in 2D semiconductors with an elliptic band structure,"D'yakonov-Perel' (DP) mechanism describes the dynamics of non-equilibrium
+spin distribution in a two-dimensional (2D) system in the presence of Rashba
+spin-orbit coupling. In this paper, we study the anisotropy of spin relaxation
+via the DP mechanism for a 2D semiconductor with an elliptic band structure.
+Within the effective-mass approximation, the low-energy band structure is
+described using anisotropic in-plane effective mass of free carriers. Spin
+relaxation time of free carriers is calculated theoretically using the time
+evolution equation of the density matrix of a polarized spin ensemble in the
+strong momentum scattering regime. Results are obtained for scattering
+potential due to both Coulomb interaction and neutral defects in the sample. We
+show that the ratio of spin relaxation time in the y- and x-direction within
+the 2D plane displays a power-law dependence on the effective mass ratio, while
+the exponent captures the details of the scattering potential. The model is
+applied to study electron spin relaxation in monolayer black phosphorus, which
+is known to exhibit significant band structure ellipticity. The model can also
+predict spin relaxation anisotropy in mechanically strained 2D materials in
+which elliptic band structure emerges as a consequence of the modification of
+the lattice constants.",1806.09488v3
+2019-02-10,Unconventional anomalous Hall effect in 3d/5d multilayers mediated by the nonlocal spin-conductivity,"We evidenced unconventionnal Anomalous Hall Effects (AHE) in 3d/5d
+(Co0.2nm/Ni0.6nm)N multilayers grown on a thin Pt layer or thin Au:W alloy. The
+inversion observed on AHE originates from the opposite sign of the spin-orbit
+coupling of Pt compared to Ni. Via advanced simulations methods for the
+description of the spin-current profiles based on the spin-dependent Boltzmann
+formalism, we extracted the spin Hall angle (SHA) of Pt and (Co/Ni) as well as
+the relevant transport parameters. The extracted SHA for Pt, +20%, is opposite
+to the one of (Co/Ni), giving rise to an effective AHE inversion for thin
+(Co/Ni) multilayers (N < 17). The spin Hall angle in Pt is found to be larger
+than the one previously measured in combined spin-pumping inverse spin-Hall
+effect experiments in a geometry of current perpendicular to plane. Whereas
+magnetic proximity effects cannot explain the effect, spin-current leakage and
+anisotropic electron scattering at Pt/(Co,Ni) interfaces fit the experiments.",1902.03564v2
+2020-08-29,Unveiling the polarity of the spin-to-charge current conversion in $Bi_2Se_3$,"We report an investigation of the spin- to charge-current conversion in
+sputter-deposited films of topological insulator $Bi_2Se_{3}$ onto single
+crystalline layers of YIG $(Y_{3}Fe_{5}O_{12})$ and polycrystalline films of
+Permalloy $(Py = Ni_{81}Fe_{19})$. Pure spin current was injected into the
+$Bi_{2}Se_{3}$ layer by means of the spin pumping process in which the spin
+precession is obtained by exciting the ferromagnetic resonance of the
+ferromagnetic film. The spin-current to charge-current conversion, occurring at
+the $Bi_{2}Se_{3}/$ferromagnet interface, was attribute to the inverse
+Rashba-Edelstein effect (IREE). By analyzing the data as a function of the
+$Bi_{2}Se_{3}$ thickness we calculated the IREE length used to characterize the
+efficiency of the conversion process and found that 1.2 pm
+$\leq|{\lambda}_{IREE}|\leq$ 2.2 pm. These results support the fact that the
+surface states of $Bi_{2}Se_{3}$ have a dominant role in the spin-charge
+conversion process, and the mechanism based on the spin diffusion process plays
+a secondary role. We also discovered that the spin- to charge-current mechanism
+in $Bi_{2}Se_{3}$ has the same polarity as the one in Ta, which is the opposite
+to the one in Pt. The combination of the magnetic properties of YIG and Py,
+with strong spin-orbit coupling and dissipationless surface states
+topologically protected of $Bi_{2}Se_{3}$ might lead to spintronic devices with
+fast and efficient spin-charge conversion.",2008.12900v1
+2020-10-16,Complete polarization of electronic spins in OLEDs,"At low temperatures and high magnetic fields, electron and hole spins in an
+organic light-emitting diode (OLED) become polarized so that recombination
+preferentially forms molecular triplet excited-state species. For low device
+currents, magnetoelectroluminescence (MEL) perfectly follows Boltzmann
+activation, implying a virtually complete polarization outcome. As the current
+increases, the MEL effect is reduced because spin polarization is suppressed by
+the reduction in carrier residence time within the device. Under these
+conditions, an additional field-dependent process affecting the spin-dependent
+recombination emerges, which appears to relate to the build-up of triplet
+excitons and the interaction with free charge carriers. Suppression of the EL
+at high fields on its own does not, strictly, prove electronic spin
+polarization. We therefore probe changes in the spin statistics of
+recombination directly in a dual singlettriplet emitting OLED, which shows a
+concomitant rise in phosphorescence intensity as fluorescence is suppressed.
+Finite spin-orbit coupling in these materials gives rise to a microscopic
+distribution in effective g factors of electrons and holes, $\Delta g$, i.e. a
+distribution in Larmor frequencies, leading to singlet-triplet mixing within
+the electronhole pair as a function of applied field. This $\Delta g$ effect in
+the pair further suppresses singlet-exciton formation in addition to thermal
+spin polarization of the individual carriers. Since the $\Delta g$ process
+involves weakly bound carrier pairs rather than free electrons and holes, in
+contrast to thermal spin polarization, the effect does not depend significantly
+on current or temperature.",2010.08313v1
+2017-11-02,Theory of Large Intrinsic Spin Hall Effect in Iridate Semimetals,"We theoretically investigate the mechanism to generate large intrinsic spin
+Hall effect in iridates or more broadly in 5d transition metal oxides with
+strong spin-orbit coupling. We demonstrate such a possibility by taking the
+example of orthorhombic perovskite iridate with nonsymmorphic lattice symmetry,
+SrIrO$_3$, which is a three-dimensional semimetal with nodal line spectrum. It
+is shown that large intrinsic spin Hall effect arises in this system via the
+spin-Berry curvature originating from the nearly degenerate electronic spectra
+surrounding the nodal line. This effect exists even when the nodal line is
+gently gapped out, due to the persistent nearly degenerate electronic
+structure, suggesting a distinct robustness. The magnitude of the spin Hall
+conductivity is shown to be comparable to the best known example such as doped
+topological insulators and the biggest in any transition metal oxides. To gain
+further insight, we compute the intrinsic spin Hall conductivity in both of the
+bulk and thin film systems. We find that the geometric confinement in thin
+films leads to significant modifications of the electronic states, leading to
+even bigger spin Hall conductivity in certain cases. We compare our findings
+with the recent experimental report on the discovery of large spin Hall effect
+in SrIrO$_3$ thin films.",1711.00861v1
+2018-10-09,Coherent spin dynamics of electrons and holes in CsPbBr$_3$ perovskite crystals,"The lead halide perovskites demonstrate huge potential for optoelectronic
+applications, high energy radiation detectors, light emitting devices and solar
+energy harvesting. Those materials exhibit strong spin-orbit coupling enabling
+efficient optical orientation of carrier spins in perovskite-based devices with
+performance controlled by a magnetic field. Perovskites are promising for
+spintronics due to substantial bulk and structure inversion asymmetry, however,
+their spin properties are not studied in detail. Here we show that elaborated
+time-resolved spectroscopy involving strong magnetic fields can be successfully
+used for perovskites. We perform a comprehensive study of high-quality
+CsPbBr$_3$ crystals by measuring the exciton and charge carrier $g$-factors,
+spin relaxation times and hyperfine interaction of carrier and nuclear spins by
+means of coherent spin dynamics. Owing to their ""inverted"" band structure,
+perovskites represent appealing model systems for semiconductor spintronics
+exploiting the valence band hole spins, while in conventional semiconductors
+the conduction band electrons are considered for spin functionality.",1810.04081v1
+2019-05-01,Competing orders in pyrochlore magnets from a $\mathbb{Z}_2$ spin liquid perspective,"The pyrochlore materials have long been predicted to harbor a quantum spin
+liquid, an intrinsic long-range-entangled state supporting fractionalized
+excitations. Existing pyrochlore experiments, on the other hand, have
+discovered several weakly ordered states and a tendency of close competition
+amongst them. Motivated by these facts, we give a complete classification of
+spin-orbit-coupled $\mathbb{Z}_2$ spin-liquid states on the pyrochlore lattice
+by using the projective symmetry group (PSG) approach for bosonic spinons. For
+each spin liquid, we construct a mean-field Hamiltonian that can be used to
+describe phase transitions out of the spin liquid via spinon condensation.
+Studying these phase transitions, we establish phase diagrams for our
+mean-field Hamiltonians that link magnetic orders to specific spin liquids. In
+general, we find that seemingly unrelated magnetic orders are intertwined with
+each other and that the conventional spin orders seen in the experiments are
+accompanied by more exotic hidden orders. Our critical theories are categorized
+into $z=1$ and $z=2$ types, based on their spinon dispersion and Hamiltonian
+diagonalizability, and are shown to give distinct signatures in the heat
+capacity and the spin structure factor. This study provides a clear map of
+pyrochlore phases for future experiments and variational Monte Carlo studies in
+pyrochlore materials.",1905.00460v2
+2021-06-01,Quantum control of the tin-vacancy spin qubit in diamond,"Group-IV color centers in diamond are a promising light-matter interface for
+quantum networking devices. The negatively charged tin-vacancy center (SnV) is
+particularly interesting, as its large spin-orbit coupling offers strong
+protection against phonon dephasing and robust cyclicity of its optical
+transitions towards spin-photon entanglement schemes. Here, we demonstrate
+multi-axis coherent control of the SnV spin qubit via an all-optical stimulated
+Raman drive between the ground and excited states. We use coherent population
+trapping and optically driven electronic spin resonance to confirm coherent
+access to the qubit at 1.7 K, and obtain spin Rabi oscillations at a rate of
+$\Omega/2\pi$=3.6(1) MHz. All-optical Ramsey interferometry reveals a spin
+dephasing time of $T_2^*$=1.3(3)$\mu$s and two-pulse dynamical decoupling
+already extends the spin coherence time to $T_2$=0.33(14) ms. Combined with
+transform-limited photons and integration into photonic nanostructures, our
+results make the SnV a competitive spin-photon building block for quantum
+networks.",2106.00723v1
+2021-06-08,Observation of the out-of-plane polarized spin current from CVD grown WTe2,"Weyl semimetal Td-phase WTe2 possesses the spin-resolved band structure with
+strong spin-orbit coupling, holding promises as a useful spin source material.
+The noncentrosymmetric crystalline structure of Td-WTe2 endows the generation
+of the out-of-plane polarized spin, which is of great interest in magnetic
+memory applications. Previously, WTe2 was explored in spin devices based on
+mechanically exfoliated single crystal flakes with a size of micrometers. For
+practical spintronics applications, it is highly desirable to implement
+wafer-scale thin films. In this work, we utilize centimeter-scale chemical
+vapor deposition (CVD)-grown Td-WTe2 thin films and study the spin current
+generation by the spin torque ferromagnetic resonance technique. We find the
+in-plane and out-of-plane spin conductivities of 7.36 x 10^3 (h/2e) (ohm-m)^-1
+and 1.76 x 10^3 (h/2e) (ohm-m)^-1, respectively, in CVD-growth 5 nm-WTe2. We
+further demonstrate the current-induced magnetization switching in WTe2/NiFe at
+room temperature in the domain wall motion regime, which may invigorate
+potential spintronic device innovations based on Weyl semimetals.",2106.04154v1
+2021-10-25,Spin relaxation in a single-electron graphene quantum dot,"The relaxation time of a single-electron spin is an important parameter for
+solid-state spin qubits, as it directly limits the lifetime of the encoded
+information. Thanks to the low spin-orbit interaction and low hyperfine
+coupling, graphene and bilayer graphene (BLG) have long been considered
+promising platforms for spin qubits. Only recently, it has become possible to
+control single-electrons in BLG quantum dots (QDs) and to understand their
+spin-valley texture, while the relaxation dynamics have remained mostly
+unexplored. Here, we report spin relaxation times ($T_1$) of single-electron
+states in BLG QDs. Using pulsed-gate spectroscopy, we extract relaxation times
+exceeding 200 $\mu$s at a magnetic field of 1.9 T. The $T_1$ values show a
+strong dependence on the spin splitting, promising even longer $T_1$ at lower
+magnetic fields, where our measurements are limited by the signal-to-noise
+ratio. The relaxation times are more than two orders of magnitude larger than
+those previously reported for carbon-based QDs, suggesting that graphene is a
+potentially promising host material for scalable spin qubits.",2110.13051v3
+2021-11-18,Spin transport at finite temperatures: A first-principles study for ferromagnetic$|$nonmagnetic interfaces,"Symmetry lowering at an interface leads to an enhancement of the effect of
+spin-orbit coupling and to a discontinuity of spin currents passing through the
+interface. This discontinuity is characterized by a ""spin-memory loss"" (SML)
+parameter $\delta$ that has only been determined directly at low temperatures.
+Although $\delta$ is believed to be significant in experiments involving
+interfaces between ferromagnetic and nonmagnetic metals, especially heavy
+metals like Pt, it is more often than not neglected to avoid introducing too
+many unknown interface parameters in addition to often poorly known bulk
+parameters like the spin-flip diffusion length $l_{\rm sf}$. In this work, we
+calculate $\delta$ along with the interface resistance $AR_{\rm I}$ and the
+spin-asymmetry parameter $\gamma$ as a function of temperature for Co$|$Pt and
+Py$|$Pt interfaces where Py is the ferromagnetic Ni$_{80}$Fe$_{20}$ alloy,
+permalloy. We use first-principles scattering theory to calculate the
+conductance as well as local charge and spin currents, modeling
+temperature-induced disorder with frozen thermal lattice and, for ferromagnetic
+materials, spin disorder within the adiabatic approximation. The bulk and
+interface parameters are extracted from the spin currents using a Valet-Fert
+model generalized to include SML.",2111.09731v1
+2022-04-13,Non-local spin entanglement in a fermionic chain,"An effective two-spin density matrix (TSDM) for a pair of spin-$1/2$ degree
+of freedom, residing at a distance of $R$ in a spinful Fermi sea, can be
+obtained from the two-electron density matrix following the framework
+prescribed in Phys. Rev. A 69, 054305 (2004). We note that the single spin
+density matrix (SSDM) obtained from this TSDM for generic spin-degenerate
+systems of free fermions is always pinned to the maximally mixed state $i.e.$
+$(1/2) \ \mathbb{I}$, independent of the distance $R$ while the TSDM confirms
+to the form for the set of maximally entangled mixed state (the so called
+""X-state"") at finite $R$. The X-state reduces to a pure state (a singlet) in
+the $R\rightarrow 0$ limit while it saturates to an X-state with largest
+allowed value of von-Neumann entropy of $2 \ln2$ as $R \rightarrow \infty$
+independent of the value of chemical potential. However, once an external
+magnetic field is applied to lift the spin-degeneracy, we find that the
+von-Neumann entropy of SSDM becomes a function of the distance $R$ between the
+two spins. We also show that the von-Neumann entropy of TSDM in the
+$R\rightarrow \infty$ limit becomes a function of the chemical potential and it
+saturate to $2 \ln2$ only when the band in completely filled unlike the
+spin-degenerate case. Finally we extend our study to include spin-orbit
+coupling and show that it does effect these asymptotic results. Our findings
+are in sharp contrast with previous works which were based on continuum models
+owing to physics which stem from the lattice model.",2204.06579v1
+2022-07-15,Spin-split collinear antiferromagnets: a large-scale ab-initio study,"It was recently discovered that, depending on their symmetries, collinear
+antiferromagnets can actually break the spin degeneracy in momentum space, even
+in the absence of spin-orbit coupling. Such systems, recently dubbed
+altermagnets, are signalled by the emergence of a spin-momentum texture set
+mainly by the crystal and magnetic structure, relativistic effects playing a
+secondary role. Here we consider all collinear $q$=0 antiferromagnetic
+compounds in the MAGNDATA database allowing for spin-split bands. Based on
+density-functional calculations for the experimentally reported crystal and
+magnetic structures, we study more than sixty compounds and introduce numerical
+measures for the average momentum-space spin splitting. We highlight some
+compounds that are of particular interest, either due to a relatively large
+spin splitting, such as CoF$_2$ and FeSO$_4$F, or because of their low-energy
+electronic structure. The latter include LiFe$_2$F$_6$, which hosts nearly flat
+spin-split bands next to the Fermi energy, as well as RuO$_2$, CrNb$_4$S$_8$,
+and CrSb, which are spin-split antiferromagnetic metals.",2207.07592v2
+2022-11-01,Spin-polarization anisotropy included by mechanical bending in tungsten diselenide nanoribbons and tunable excitonic states,"A WSe$_2$ monolayer shows many interesting properties due to its spin-orbit
+coupling induced spin splitting in bands around the Fermi level and the
+spin-valley configuration. The orientation of the spin polarization in the
+relevant bands is crucial for the nature of exciton states and the optical
+valley selectivity. In this work, we studied the WSe$_2$ nanoribbons under
+different mechanical bending curvatures and electron/hole doping with density
+functional theory and their optical absorption and excitonic states with
+many-body perturbation GW and BSE (Bethe-Salpeter equation) methods. We found
+that the WSe$_2$ nanoribbons can exhibit an enhanced SOC effect and a spatially
+varying spin polarization in bands around the Fermi level under bending. The
+spin-polarization can show an anisotropy (or asymmetry) in those nearly
+degenerate bands, leading to a controllable magnetism via bending and
+electron/hole doping to the nanoribbons, suggesting a potential application in
+compact and controllable magnetic nanodevices and spintronics. The optical
+absorption spectrum of the nanoribbon presents a large tunability with bending
+within the near infrared region of about 0.4 to 1.5 eV, showing an enhanced
+absorption at a large bending condition. The exciton states generally show
+mixed or various spin configuration in the electron and hole pairs that are
+controlled by bending, potentially useful for applications in spin-based
+quantum information processes.",2211.00258v1
+2022-12-08,"Spin Relaxation, Diffusion and Edelstein Effect in Chiral Metal Surface","We study electron spin transport at spin-splitting surface of
+chiral-crystalline-structured metals and Edelstein effect at the interface, by
+using the Boltzmann transport equation beyond the relaxation time
+approximation. We first define spin relaxation time and spin diffusion length
+for two-dimensional systems with anisotropic spin--orbit coupling through the
+spectrum of the integral kernel in the collision integral. We then explicitly
+take account of the interface between the chiral metal and a nonmagnetic metal
+with finite thickness. For this composite system, we derive analytical
+expressions for efficiency of the charge current--spin current interconversion
+as well as other coefficients found in the Edelstein effect. We also develop
+the Onsager's reciprocity in the Edelstein effect along with experiments so
+that it relates local input and output, which are respectively defined in the
+regions separated by the interface. We finally provide a transfer matrix
+corresponding to the Edelstein effect through the interface, with which we can
+easily represent the Onsager's reciprocity as well as the charge--spin
+conversion efficiencies we have obtained. We confirm the validity of the
+Boltzmann transport equation in the present system starting from the Keldysh
+formalism in the supplemental material. Our formulation also applies to the
+Rashba model and other spin-splitting systems.",2212.04202v2
+2023-03-07,Tunability of Andreev levels in a spin-active Ising Superconductor/Half Metal Josephson junction,"We study the Andreev levels, supercurrent and tunnelling conductance in a
+clean Ising superconductor (ISC)/half metal (HM)/Ising superconductor (ISC)
+Josephson junction with spin-active interfaces using Bogoliubov-de Gennes
+equations. We theoretically demonstrate the effect of spin mixing, spin
+flipping processes and spin-orbit coupling (SOC) of the ISC on Andreev Bound
+States (ABS) spectra, current phase relation (CPR) and tunnelling conductance
+in transparent and opaque barrier limit. We witness an additional splitting of
+the Andreev levels due to SOC of the ISC and $0 - \pi$ transition for different
+barrier magnetic moments. Also, different $\phi$ - junctions can be achieved by
+tuning the strength of the barrier magnetic moment and spin mismatch angle.
+Moreover, a possible $0 - \pi$ transition can also be achieved for SOC stronger
+than the chemical potential of the ISC using suitable control parameters. The
+interplay of spin mixing and spin flipping processes with SOC can also host
+Majorana modes in the proposed system. The tunnelling conductance is found to
+be dependent on the spin mismatch angle. Also, a finite sub-gap conductance is
+observed, which indicates different probabilities of Andreev reflected
+electrons and holes in the presence of SOC. Furthermore, anomalous Andreev
+levels are observed for different HM length scales signifying its role in the
+tunability of the $\phi$ - phase Josephson junction.",2303.03784v1
+2023-07-12,Spintronics in 2D graphene-based van der Waals heterostructures,"Spintronics has become a broad and important research field that intersects
+with magnetism, nano-electronics, and materials science. Its overarching aim is
+to provide a fundamental understanding of spin-dependent phenomena in
+solid-state systems that can enable a new generation of spin-based logic
+devices. Over the past decade, graphene and related 2D van der Waals crystals
+have taken center stage in expanding the scope and potential of spintronic
+materials. Their distinctive electronic properties and atomically thin nature
+have opened new opportunities to probe and manipulate internal electronic
+degrees of freedom. Purely electrical control over conduction-electron spins
+can be attained in graphene-transition metal dichalcogenide heterostructures,
+due to proximity effects combined with graphene's high electronic mobility.
+Specifically, graphene experiences a proximity-induced spin-orbit coupling that
+enables efficient spin-charge interconversion processes; the two most
+well-known and at the forefront of current research are the spin Hall and
+inverse spin galvanic effects, wherein an electrical current yields a spin
+current and non-equilibrium spin polarization, respectively. This article
+provides an overview of the basic principles, theory, and experimental methods
+underpinning the nascent field of 2D material-based spintronics.",2307.06273v1
+2023-07-26,Giant spin-charge conversion in ultrathin films of the MnPtSb half-Heusler compound,"Half-metallic half-Heusler compounds with strong spin-orbit-coupling and
+broken inversion symmetry in their crystal structure are promising materials
+for generating and absorbing spin-currents, thus enabling the electric
+manipulation of magnetization in energy-efficient spintronic devices. In this
+work, we report the spin-to-charge conversion in sputtered ultrathin films of
+the half-Heusler compound MnPtSb with thickness (t) in the range from 1 to 6
+nm. A combination of X-ray and transmission electron microscopy measurements
+evidence the epitaxial nature of these ultrathin non-centrosymmetric MnPtSb
+films, with a clear (111)-orientation obtained on top of (0001) single-crystal
+sapphire substrates. The study of the thickness (t)-dependent magnetization
+dynamics of the MnPtSb(t)/Co(5nm)/Au(5nm) heterostructure revealed that the
+MnPtSb compound can be used as an efficient spin current generator, even at
+film thicknesses as low as 1 nm. By making use of spin pumping FMR, we measure
+a remarkable t-dependent spin-charge conversion in the MnPtSb layers, which
+clearly demonstrate the interfacial origin of the conversion. When interpreted
+as arising from the inverse Edelstein effect (IEE), the spin-charge conversion
+efficiency extracted at room temperature for the thinnest MnPtSb layer reaches
+{\lambda}IEE~3 nm, representing an extremely high spin-charge conversion
+efficiency at room temperature. The still never explored ultrathin regime of
+the MnPtSb films studied in this work and the discover of their outstanding
+functionality are two ingredients which demonstrate the potentiality of such
+materials for future applications in spintronics.",2307.14516v1
+2023-10-09,Mapping of Spin-Wave Transport in Thulium Iron Garnet Thin Films Using Diamond Quantum Microscopy,"Spin waves, collective dynamic magnetic excitations, offer crucial insights
+into magnetic material properties. Rare-earth iron garnets offer an ideal
+spin-wave (SW) platform with long propagation length, short wavelength,
+gigahertz frequency, and applicability to magnon spintronic platforms. Of
+particular interest, thulium iron garnet (TmIG) has attracted a huge interest
+recently due to its successful growth down to a few nanometers, observed
+topological Hall effect and spin orbit torque-induced switching effects.
+However, there is no direct spatial measurement of its SW properties. This work
+uses diamond nitrogen vacancy (NV) magnetometry in combination with SW
+electrical transmission spectroscopy to study SW transport properties in TmIG
+thin films. NV magnetometry allows probing spin waves at the sub-micrometer
+scale, seen by the amplification of the local microwave magnetic field due to
+the coupling of NV spin qubits with the stray magnetic field produced by the
+microwave-excited spin waves. By monitoring the NV spin resonances, the SW
+properties in TmIG thin films are measured as function of the applied magnetic
+field, including their amplitude, decay length (~ 50 um), and wavelength (0.8 -
+2 um). These results pave the way for studying spin qubit-magnon interactions
+in rare-earth magnetic insulators, relevant to quantum magnonics applications.",2310.06188v4
+2024-03-01,Microwave Control of the Tin-Vacancy Spin Qubit in Diamond with a Superconducting Waveguide,"Group-IV color centers in diamond are promising candidates for quantum
+networks due to their dominant zero-phonon line and symmetry-protected optical
+transitions that connect to coherent spin levels. The negatively charged
+tin-vacancy (SnV) center possesses long electron spin lifetimes due to its
+large spin-orbit splitting. However, the magnetic dipole transitions required
+for microwave spin control are suppressed, and strain is necessary to enable
+these transitions. Recent work has shown spin control of strained emitters
+using microwave lines that suffer from Ohmic losses, restricting coherence
+through heating. We utilize a superconducting coplanar waveguide to measure SnV
+centers subjected to strain, observing substantial improvement. A detailed
+analysis of the SnV center electron spin Hamiltonian based on the
+angle-dependent splitting of the ground and excited states is performed. We
+demonstrate coherent spin manipulation and obtain a Hahn echo coherence time of
+up to $T_2 = 430\,\mu$s. With dynamical decoupling, we can prolong coherence to
+$T_2 = 10\,$ms, about six-fold improved compared to earlier works. We also
+observe a nearby coupling $^{13}\mathrm{C}$ spin which may serve as a quantum
+memory. This substantiates the potential of SnV centers in diamond and
+demonstrates the benefit of superconducting microwave structures.",2403.00521v1
+2013-05-14,How to construct the proper gauge-invariant density matrix in steady-state nonequilibrium: Applications to spin-transfer and spin-orbit torques,"Experiments observing spin density and spin currents (responsible for, e.g.,
+spin-transfer torque) in spintronic devices measure only the nonequilibrium
+contributions to these quantities, typically driven by injecting unpolarized
+charge current or by applying external time-dependent fields. On the other
+hand, theoretical approaches to calculate them operate with both the
+nonequilibrium (carried by electrons around the Fermi surface) and the
+equilibrium (carried by the Fermi sea electrons) contributions. Thus, an
+unambiguous procedure should remove the equilibrium contributions, thereby
+rendering the nonequilibrium ones which are measurable and satisfy the
+gauge-invariant condition according to which expectation values of physical
+quantities should not change when electric potential everywhere is shifted by a
+constant amount. Using the framework of nonequilibrium Green functions, we
+delineate such procedure which yields the proper gauge-invariant nonequilibrium
+density matrix in the linear-response and elastic transport regime for
+current-carrying steady state of an open quantum system connected to two
+macroscopic reservoirs. Its usage is illustrated by computing: (i) conventional
+spin-transfer torque (STT) in asymmetric F/I/F magnetic tunnel junctions
+(MTJs); (ii) unconventional STT in asymmetric N/I/F semi-MTJs with the strong
+Rashba spin-orbit coupling (SOC) at the I/F interface and injected current
+perpendicular to that plane; and (iii) current-driven spin density within a
+clean ferromagnetic Rashba spin-split two-dimensional electron gas (2DEG) which
+generates SO torque in laterally patterned N/F/I heterostructures when such
+2DEG is located at the N/F interface and injected charge current flows parallel
+to the plane.",1305.3180v2
+2005-07-04,Tight-Binding model for semiconductor nanostructures,"An empirical $s_cp^3_a$ tight-binding (TB) model is applied to the
+investigation of electronic states in semiconductor quantum dots. A basis set
+of three $p$-orbitals at the anions and one $s$-orbital at the cations is
+chosen. Matrix elements up to the second nearest neighbors and the spin-orbit
+coupling are included in our TB-model. The parametrization is chosen so that
+the effective masses, the spin-orbit-splitting and the gap energy of the bulk
+CdSe and ZnSe are reproduced. Within this reduced $s_cp_a^3$ TB-basis the
+valence (p-) bands are excellently reproduced and the conduction (s-) band is
+well reproduced close to the $\Gamma$-point, i.e. near to the band gap. In
+terms of this model much larger systems can be described than within a (more
+realistic) $sp^3s^*$-basis. The quantum dot is modelled by using the (bulk)
+TB-parameters for the particular material at those sites occupied by atoms of
+this material. Within this TB-model we study pyramidal-shaped CdSe quantum dots
+embedded in a ZnSe matrix and free spherical CdSe quantum dots (nanocrystals).
+Strain-effects are included by using an appropriate model strain field. Within
+the TB-model, the strain-effects can be artifically switched off to investigate
+the infuence of strain on the bound electronic states and, in particular, their
+spatial orientation. The theoretical results for spherical nanocrystals are
+compared with data from tunneling spectroscopy and optical experiments.
+Furthermore the influence of the spin-orbit coupling is investigated.",0507052v1
+2011-01-27,Global analysis of data on the spin-orbit coupled $A^{1}Σ_{u}^{+}$ and $b^{3}Π_{u}$ states of Cs2,"We present experimentally derived potential curves and spin-orbit interaction
+functions for the strongly perturbed $A^{1}\Sigma_{u}^{+}$ and $b^{3}\Pi_{u}$
+states of the cesium dimer. The results are based on data from several sources.
+Laser-induced fluorescence Fourier transform spectroscopy (LIF FTS) was used
+some time ago in the Laboratoire Aim\'{e} Cotton primarily to study the $X
+^{1}\Sigma_{g}^{+}$ state. More recent work at Tsinghua University provides
+information from moderate resolution spectroscopy on the lowest levels of the
+$b^{3}\Pi_{0u}^{\pm}$ states as well as additional high resolution data. From
+Innsbruck University, we have precision data obtained with cold Cs$_{2}$
+molecules. Recent data from Temple University was obtained using the
+optical-optical double resonance polarization spectroscopy technique, and
+finally, a group at the University of Latvia has added additional LIF FTS data.
+In the Hamiltonian matrix, we have used analytic potentials (the Expanded Morse
+Oscillator form) with both finite-difference (FD) coupled-channels and discrete
+variable representation (DVR) calculations of the term values. Fitted diagonal
+and off-diagonal spin-orbit functions are obtained and compared with {\it ab
+initio} results from Temple and Moscow State universities.",1101.5412v1
+2011-11-30,Semimetal and Topological Insulator in Perovskite Iridates,"The two-dimensional layered perovskite Sr2IrO4 was proposed to be a
+spin-orbit Mott insulator, where the effect of Hubbard interaction is amplified
+on a narrow J_{eff} = 1/2 band due to strong spin-orbit coupling. On the other
+hand, the three-dimensional orthorhombic perovskite (Pbnm) SrIrO3 remains
+metallic. To understand the physical origin of the metallic state and possible
+transitions to insulating phases, we construct a tight-binding model for
+SrIrO3. The band structure possesses a line node made of J_{eff} = 1/2 bands
+below the Fermi level. As a consequence, instability towards magnetic ordering
+is suppressed and the system remains metallic. This line node, originating from
+the underlying crystal structure, turns into a pair of three-dimensional nodal
+points on the introduction of a staggered potential or spin-orbit coupling
+strength between alternating layers. Increasing this potential beyond a
+critical strength induces a transition to a strong topological insulator,
+followed by another transition to a normal band insulator. We propose that
+materials constructed with alternating Ir- and Rh-oxide layers along the (001)
+direction, such as Sr2IrRhO6, are candidates for a strong topological
+insulator.",1112.0015v2
+2012-06-25,Interplay between spin-orbit coupling and Hubbard interaction in SrIrO3 and related Pbnm perovskites,"There has been a rapidly growing interest on the interplay between spin-orbit
+coupling (SOC) and Hubbard interaction U in correlated materials. A current
+consensus is that the stronger the SOC, the smaller is the critical interaction
+Uc required for a spin-orbit Mott insulator, because the atomic SOC splits a
+band into different total angular momentum bands narrowing the effective
+bandwidth. It was further claimed that at large enough SOC, the stronger the
+SOC, the weaker the Uc because in general the effective SOC is enhanced with
+increasing electron-electron interaction strength. Contrary to this
+expectation, we find that, in orthorhombic perovskite oxides (Pbnm), the
+stronger the SOC, the bigger the Uc. This is originated from a line of Dirac
+node in Jeff=1/2 bands near the Fermi level inherited from a combination of the
+lattice structure and a large SOC. Due to this protected line of nodes, there
+are small hole and electron pockets in SrIrO3, and such a small density of
+states makes Hubbard interaction less efficient in building a magnetic
+insulator. The full phase diagram in U vs. SOC is obtained, where non-magnetic
+semimetal, magnetic metal, and magnetic insulator are found. Magnetic ordering
+patterns beyond Uc are also presented. We further discuss implications of our
+finding in relation to other perovskites such as SrRhO3 and SrRuO3.",1206.5836v2
+2013-12-17,Dynamical resonance locking in tidally interacting binary systems,"We examine the dynamics of resonance locking in detached, tidally interacting
+binary systems. In a resonance lock, a given stellar or planetary mode is
+trapped in a highly resonant state for an extended period of time, during which
+the spin and orbital frequencies vary in concert to maintain the resonance.
+This phenomenon is qualitatively similar to resonance capture in planetary
+dynamics. We show that resonance locks can accelerate the course of tidal
+evolution in eccentric systems and also efficiently couple spin and orbital
+evolution in circular binaries. Previous analyses of resonance locking have not
+treated the mode amplitude as a fully dynamical variable, but rather assumed
+the adiabatic (i.e. Lorentzian) approximation valid only in the limit of
+relatively strong mode damping. We relax this approximation, analytically
+derive conditions under which the fixed point associated with resonance locking
+is stable, and further check these analytic results using numerical
+integrations of the coupled mode, spin, and orbital evolution equations. These
+show that resonance locking can sometimes take the form of complex limit cycles
+or even chaotic trajectories. We provide simple analytic formulae that define
+the binary and mode parameter regimes in which resonance locks of some kind
+occur (stable, limit cycle, or chaotic). We briefly discuss the astrophysical
+implications of our results for white dwarf and neutron star binaries as well
+as eccentric stellar binaries.",1312.4966v2
+2014-12-17,Giant negative magnetoresistance driven by spin-orbit coupling at the LAO/STO interface,"The LAO/STO interface hosts a two-dimensional electron system that is
+unusually sensitive to the application of an in-plane magnetic field.
+Low-temperature experiments have revealed a giant negative magnetoresistance
+(dropping by 70\%), attributed to a magnetic-field induced transition between
+interacting phases of conduction electrons with Kondo-screened magnetic
+impurities. Here we report on experiments over a broad temperature range,
+showing the persistence of the magnetoresistance up to the 20~K range ---
+indicative of a single-particle mechanism. Motivated by a striking
+correspondence between the temperature and carrier density dependence of our
+magnetoresistance measurements we propose an alternative explanation. Working
+in the framework of semiclassical Boltzmann transport theory we demonstrate
+that the combination of spin-orbit coupling and scattering from finite-range
+impurities can explain the observed magnitude of the negative
+magnetoresistance, as well as the temperature and electron density dependence.",1412.5614v2
+2016-04-20,Spin-orbital coupling effect on power factor in semiconducting transition-metal dichalcogenide monolayers,"The electronic structures and thermoelectric properties of semiconducting
+transition-metal dichalcogenide monolayers $\mathrm{MX_2}$ (M=Zr, Hf, Mo, W and
+Pt; X=S, Se and Te) are investigated by combining first-principles and
+Boltzmann transport theory, including spin-orbital coupling (SOC). It is found
+that the gap decrease increases from S to Te in each cation group, when the SOC
+is opened. The spin-orbital splitting has the same trend with gap reducing.
+Calculated results show that SOC has noteworthy detrimental effect on p-type
+power factor, while has a negligible influence in n-type doping except W cation
+group, which can be understood by considering the effects of SOC on the valence
+and conduction bands. For $\mathrm{WX_2}$ (X=S, Se and Te), the SOC leads to
+observably enhanced power factor in n-type doping, which can be explained by
+SOC-induced band degeneracy, namely bands converge. Among all cation groups, Pt
+cation group shows the highest Seebeck coefficient, which leads to best power
+factor, if we assume scattering time is fixed. Calculated results show that
+$\mathrm{MS_2}$ (M=Zr, Hf, Mo, W and Pt) have best p-type power factor for all
+cation groups, and that $\mathrm{MSe_2}$ (M=Zr and Hf), $\mathrm{WS_2}$ and
+$\mathrm{MTe_2}$ (M=Mo and Pt) have more wonderful n-type power factor in
+respective cation group. Therefore, these results may be useful for further
+theoretical prediction or experimental search of excellent thermoelectric
+materials from semiconducting transition-metal dichalcogenide monolayers.",1604.05934v1
+2016-06-09,Giant spin-orbit splitting of point defect states in monolayer WS$_2$,"The spin-orbit coupling (SOC) effect has been known to be profound in
+monolayer pristine transition metal dichalcogenides (TMDs). Here we show that
+point defects, which are omnipresent in the TMD membranes, exhibit even
+stronger SOC effects and change the physics of the host materials drastically.
+In this Article we chose the representative monolayer WS\sub{2} slabs from the
+TMD family together with seven typical types of point defects including
+monovacancies, interstitials, and antisites. We calculated the formation
+energies of these defects, and studied the effect of spin-orbit coupling (SOC)
+on the corresponding defect states. We found that the S monovacancy (V\sub{S} )
+and S interstitial (adatom) have the lowest formation energies. In the case of
+V\sub{S} and both of the W\sub{S and W\sub{S2} antisites, the defect states
+exhibit giant splitting up to 296 meV when SOC is considered. Depending on the
+relative position of the defect state with respect to the conduction band
+minimum (CBM), the hybrid functional HSE will either increase the splitting by
+up to 60 meV (far from CBM), or decrease the splitting by up to 57 meV (close
+to CBM). Furthermore, we found that both the W\sub{S} and W\sub{S2} antisites
+possess a magnetic moment of 2 $\mu_{B}$ localized at the antisite W atom and
+the neighboring W atoms. All these findings provide new insights in the defect
+behavior under SOC point to new possibilities for spintronics applications for
+TMDs.",1606.02906v1
+2016-09-30,Three-dimensional higher-spin Dirac and Weyl dispersions in the strongly isotropic $K_4$ crystal,"We analyze the electronic structure in the three-dimensional (3D) crystal
+formed by the $sp^2$ hybridized orbitals ($K_4$ crystal), by the tight-binding
+approach based on the first-principles calculation. We discover that the bulk
+Dirac-cone dispersions are realized in the $K_4$ crystal. In contrast to the
+graphene, the energy dispersions of the Dirac cones are isotropic in 3D and the
+pseudospin $S=1$ Dirac cones emerge at the $\Gamma$ and $H$ points of the bcc
+Brillouin zone, where three bands become degenerate and merge at a single point
+belonging to the $T_2$ irreducible representation. In addition, the usual
+$S=1/2$ Dirac cones emerge at the $P$ point. By focusing the hoppings between
+the nearest-neighbor sites, we show an analytic form of the tight-binding
+Hamiltonian with a $4\times 4 $ matrix, and we give an explicit derivation of
+the $S=1$ and $S=1/2$ Dirac-cone dispersions. We also analyze the effect of the
+spin-orbit coupling to examine how the degeneracies at Dirac points are lifted.
+At the $S=1$ Dirac points, the spin-orbit coupling lifts the energy level with
+sixfold degeneracy into two energy levels with two-dimensional $\bar E_2$ and
+four-dimensional $\bar F$ representations. Remarkably, all the dispersions near
+the $\bar F$ point show the linear dependence in the momentum with different
+velocities. We derive the effective Hamiltonian near the $\bar F$ point and
+find that the band contact point is described by the $S=3/2$ Weyl point.",1609.09762v2
+2018-01-07,High-pressure insulator-to-metal transition in Sr$_3$Ir$_2$O$_7$ studied by x-ray absorption spectroscopy,"High-pressure x-ray absorption spectroscopy was performed at the Ir $L_3$ and
+$L_2$ absorption edges of Sr$_3$Ir$_2$O$_7$. The branching ratio of white line
+intensities continuously decreases with pressure, reflecting a reduction in the
+angular part of the expectation value of the spin-orbit coupling operator,
+$\left\langle {\bf L} \cdot {\bf S} \right\rangle$. Up to the high-pressure
+structural transition at 53 GPa, this behavior can be explained within a
+single-ion model, where pressure increases the strength of the cubic crystal
+field, which suppresses the spin-orbit induced hybridization of $J_{\text{eff}}
+= 3/2$ and $e_g$ levels. We observe a further reduction of the branching ratio
+above the structural transition, which cannot be explained within a single-ion
+model of spin-orbit coupling and cubic crystal fields. This change in
+$\left\langle {\bf L} \cdot {\bf S} \right\rangle$ in the high-pressure,
+metallic phase of Sr$_3$Ir$_2$O$_7$ could arise from non-cubic crystal fields
+or a bandwidth-driven hybridization of $J_{\text{eff}}=1/2,\,3/2$ states, and
+suggests that the electronic ground state significantly deviates from the
+$J_{\text{eff}}=1/2$ limit.",1801.02234v1
+2019-03-06,Spin and orbital ordering in TlMnO3: Neutron diffraction study,"Crystal and magnetic structures of the high-pressure stabilized perovskite
+phase of TlMnO3 have been studied by neutron powder diffraction. The crystal
+structure involves two types of primary structural distortions:
+a+b-b-octahedral tilting and antiferrodistortive type of orbital ordering,
+whose common action reduces the symmetry down to triclinic P -1. The orbital
+pattern and the way it is combined with the octahedral tilting are different
+from the family of LnMnO3 (Ln = lanthanide or Y) manganites who share with
+TlMnO3 the same tilting scheme. The experimentally determined magnetic
+structure with the k = (1/2,0,1/2) propagation vector and P_S-1 symmetry
+implies anisotropic exchange interactions with a ferromagnetic coupling within
+the (1,0,-1) planes and an antiferromagnetic one between them (A type). The
+spins in the primary magnetic mode were found to be confined close to the
+(1,0,-1) plane, which underlines the predominant role of the single ion
+anisotropy with the local easy axes of Mn3+ following the Jahn-Teller
+distortions of the octahedra. In spite of the same octahedral tilting scheme in
+the perovskite structures of both LnMnO3 and TlMnO3 manganites, a coupling of
+the secondary ferromagnetic component to the primary A-type spin configuration
+through antisymmetric exchange interaction is allowed in the former and
+forbidden in the latter cases.",1903.02347v1
+2020-08-04,Strong-field physics in three-dimensional topological insulators,"We investigate theoretically the strong-field regime of light-matter
+interactions in the topological-insulator class of quantum materials. In
+particular, we focus on the process of non-perturbative high-order harmonic
+generation from the paradigmatic three-dimensional topological insulator
+bismuth selenide (Bi$_2$Se$_3$) subjected to intense mid-infrared laser fields.
+We analyze the contributions from the spin-orbit-coupled bulk states and the
+topological surface bands separately and reveal a major difference in how their
+harmonic yields depend on the ellipticity of the laser field. Bulk harmonics
+show a monotonous decrease in their yield as the ellipticity increases, in a
+manner reminiscent of high harmonic generation in gaseous media. However, the
+surface contribution exhibits a highly non-trivial dependence, culminating with
+a maximum for circularly polarized fields. We attribute the observed anomalous
+behaviour to: (i) the enhanced amplitude and the circular pattern of the
+interband dipole and the Berry connections in the vicinity of the Dirac point;
+and (ii) the influence of the higher-order, ""hexagonal warping"" terms in the
+Hamiltonian, which are responsible for the hexagonal deformation of the energy
+surface at higher momenta. The latter are associated directly with
+spin-orbit-coupling parameters. Our results thus establish the sensitivity of
+strong-field driven high harmonic emission to the topology of the band
+structure as well as to the manifestations of spin-orbit interaction.",2008.01265v1
+2020-11-16,"Interplay of electron correlations, spin-orbit couplings, and structural effects for Cu centers in the quasi-two-dimensional magnet InCu$_{2/3}$V$_{1/3}$O$_3$","Less common ligand coordination of transition-metal centers is often
+associated with peculiar valence-shell electron configurations and outstanding
+physical properties. One example is the Fe$^+$ ion with linear coordination,
+actively investigated in the research area of single-molecule magnetism. Here
+we address the nature of 3$d^9$ states for Cu$^{2+}$ ions sitting in the center
+of trigonal bipyramidal ligand cages in the quasi-two-dimensional honeycomb
+compound InCu$_{2/3}$V$_{1/3}$O$_3$, whose unusual magnetic properties were
+intensively studied in the recent past. In particular, we discuss the interplay
+of structural effects, electron correlations, and spin-orbit couplings in this
+material. A relevant computational finding is a different sequence of the Cu
+($xz$, $yz$) and ($xy$, $x^2\!-\!y^2$) levels as compared to existing
+electronic-structure models, which has implications for the interpretation of
+various excitation spectra. Spin-orbit interactions, both first- and
+second-order, turn out to be stronger than previously assumed, suggesting that
+rather rich single-ion magnetic properties can be in principle achieved also
+for the 3$d^9$ configuration by properly adjusting the sequence of
+crystal-field states for such less usual ligand coordination.",2011.08246v1
+2016-12-07,Dielectric properties of graphene on transition metal dichalcogenide substrate,"The tunability of the dielectric properties induced by the substrate driven
+interactions (SDI) and the exchange field (M) due to the ferro-magnetic
+impurities in graphene monolayer on transition metal dichalcogenide (TMDC)
+(viz., XY2 , X = Mo, W; Y = S, Se) around K and K prime points is reported
+here. The cavalcade of interactions involve sub-lattice-resolved, strongly
+enhanced intrinsic spin-orbit couplings(SOC), the extrinsic Rashba spin-orbit
+coupling (RSOC), and the orbital gap related to the transfer of the electronic
+charge from graphene to XY2. The RSOC allows for external tuning of the band
+gap in graphene and connects the nearest neighbors with spin-flip. We obtain
+the usual gapped bands with an effective, RSOC-dependent Zeeman field due to
+the interplay of SDI. Using these bands we obtain the closed analytical
+expression of the dielectric function in the finite doping case. The zero of
+the dielectric function corresponds to the collective mode. Upon including the
+full dispersion of graphene on TMDC, we find that there is in fact only one
+collective mode and it corresponds to charge plasmons. The dispersion of the
+latter yields the q^2/3 behavior and not the well known q^1/2 behavior. We also
+find that the plasmon frequency could be changed by the tuning of the chemical
+potential.",1612.02359v2
+2020-06-21,"Crystal Structure, Magnetism, and Electronic Properties of New Rare-Earth-Free Ferromagnetic MnPt5As","The design and synthesis of targeted functional materials have been a
+long-term goal for material scientists. Although a universal design strategy is
+difficult to generate for all types of materials, however, it is still helpful
+for a typical family of materials to have such design rules. Herein, we
+incorporated several significant chemical and physical factors regarding
+magnetism, such as structure type, atom distance, spin-orbit coupling, and
+successfully synthesized a new rare-earth-free ferromagnet, MnPt5As, for the
+first time. MnPt5As can be prepared by using high-temperature pellet methods.
+According to X-ray diffraction results, MnPt5As crystallizes in a tetragonal
+unit cell with the space group P4/mmm (Pearson symbol tP7). Magnetic
+measurements on MnPt5As confirm ferromagnetism in this phase with a Curie
+temperature of ~301 K and a saturated moment of 3.5 uB per formula. Evaluation
+by applying the Stoner Criterion also indicates that MnPt5As is susceptible to
+ferromagnetism. Electronic structure calculations using the WIEN2k program with
+local spin density approximation imply that the spontaneous magnetization of
+this phase arises primarily from the hybridization of d orbitals on both Mn and
+Pt atoms. The theoretical assessments are consistent with the experimental
+results. Moreover, the spin-orbit coupling effects heavily influence on
+magnetic moments in MnPt5As. MnPt5As is the first high-performance magnetic
+material in this structure type. The discovery of MnPt5As offers a platform to
+study the interplay between magnetism and structure.",2006.11897v1
+2020-09-10,Fractionalized fermionic quantum criticality in spin-orbital Mott insulators,"We study transitions between topological phases featuring emergent
+fractionalized excitations in two-dimensional models for Mott insulators with
+spin and orbital degrees of freedom. The models realize fermionic quantum
+critical points in fractionalized Gross-Neveu$^\ast$ universality classes in
+(2+1) dimensions. They are characterized by the same set of critical exponents
+as their ordinary Gross-Neveu counterparts, but feature a different energy
+spectrum, reflecting the nontrivial topology of the adjacent phases. We
+exemplify this in a square-lattice model, for which an exact mapping to a
+$t$-$V$ model of spinless fermions allows us to make use of large-scale
+numerical results, as well as in a honeycomb-lattice model, for which we employ
+$\epsilon$-expansion and large-$N$ methods to estimate the critical behavior.
+Our results are potentially relevant for Mott insulators with $d^1$ electronic
+configurations and strong spin-orbit coupling, or for twisted bilayer
+structures of Kitaev materials.",2009.05051v3
+2021-09-08,Relativistic first principles theory of Yu--Shiba--Rusinov states applied to an Mn adatom and Mn dimers on Nb(110),"We present a fully relativistic first principles based theoretical approach
+for the calculation of the spectral properties of magnetic impurities on the
+surface of a superconducting substrate, providing a material specific framework
+for the investigation of the Yu--Shiba--Rusinov (YSR) states. By using a
+suitable orbital decomposition of the local densities of states we discuss in
+great details the formation of the YSR states for an Mn adatom and for two
+kinds of Mn dimers placed on the Nb(110) surface and compare our results to
+recent experimental findings. In case of the adatom we find that the spin-orbit
+coupling slightly shifts some of the YSR peaks and also the local
+spin-polarization on the Nb atoms have marginal effects to the their positions.
+Moreover, by scaling the exchange field on the Mn site we could explain the
+lack of the $d_{x^2-y^2}$-like YSR state in the spectrum. While our results for
+a close packed ferromagnetic dimer are in satisfactory agreement with the
+experimentally observed splitting of the YSR states, in case of an
+antiferromagnetic dimer we find that the spin-orbit coupling is not
+sufficiently large to explain the splitting of the YSR states seen in the
+experiment. Changing the relative orientation of the magnetic moments in this
+dimer induces splitting of the YSR states and also shifts their energy, leading
+even to the formation of a zero bias peak in case of the deepest YSR state.",2109.03499v1
+2022-04-16,Unique electronic state in ferromagnetic semiconductor FeCl$_{2}$ monolayer,"Two-dimensional (2D) van der Waals (vdW) magnetic materials could be an ideal
+platform for ultracompact spintronic applications. Among them, FeCl$_{2}$
+monolayer in the triangular lattice is subject to a strong debate. Thus, we
+critically examine its spin-orbital state, electronic structure, and magnetic
+properties, using a set of delicate first-principles calculations, crystal
+field level analyses, and Monte Carlo simulations. Our work reveals that
+FeCl$_{2}$ monolayer is a ferromagnetic (FM) semiconductor in which the
+electron correlation of the narrow Fe $3d$ bands determines the band gap of
+about 1.2 eV. Note that only when the spin-orbit coupling (SOC) is properly
+handled, the unique $d$$^{5\uparrow}$$l$$^\downarrow_{z+}$ electronic ground
+state is achieved. Then, both the orbital and spin contributions (0.59
+$\mu_{\rm B}$ plus 3.56 $\mu_{\rm B}$) to the total magnetic moment well
+account for, for the first time, the experimental perpendicular moment of 4.3
+$\mu_{\rm B}$/Fe. Moreover, we find that a compressive strain further
+stabilizes the $d$$^{5\uparrow}$$l$$^\downarrow_{z+}$ ground state, and that
+the enhanced magnetic anisotropy and exchange coupling would boost the Curie
+temperature ($T_{\rm C}$) from 25 K for the pristine FeCl$_{2}$ monolayer to
+69-102 K under 3$\%$-5$\%$ compressive strain. Therefore, FeCl$_{2}$ monolayer
+is indeed an appealing 2D FM semiconductor.",2204.07755v2
+2023-06-11,"Strain and spin orbit coupling effects on electronic and optical properties of 2D CX/graphene (X = S, Se, Te) vdW heterostructure for solar energy harvesting","Vertically stacked two-dimensional (2D) graphene-based van der Waals (vdW)
+heterostructures have emerged as the technological materials for electronic and
+optoelectronic device applications. In this regard, for the first time, we
+systematically predicted the electronic and optical properties of CX/G (X = S,
+Se and Te; G = graphene) heterostructures under biaxial strain and spin orbit
+coupling (SOC) by first-principles calculations. Strain is induced by applying
+mechanical stress to the heterostructures, while SOC arises due to the
+interaction between the electron spin and its orbital motion. The electronic
+property calculations reveal that all three heterostructures exhibit indirect
+semiconducting nature with a narrow bandgap of 0.47-0.62 eV and remain indirect
+under compressive and tensile strains. Strong band splitting of 78.4 meV has
+been observed in the conduction band edge of CTe/G heterostructure in the
+presence of SOC due to the lack of an inversion center attributed to the large
+hole effective mass. Under compressive strain, the p-type of Schottky contact
+of CX/G heterostructures is converted into p-type Ohmic contact because of
+nearly negligible Schottky barrier height. Further, the optical property
+assessment reveals red and blue shifts in the absorption peak of CX/G
+heterostructures with regard to tensile and compressive strains, respectively.
+Despite this, the CTe/G heterostructure achieves a remarkable high {\eta} of
+24.53% in the strain-free case whereas, it reaches to 28.31% with 4%
+compressive strain, demonstrating the potential for solar energy conversion
+device applications. Our findings suggest that CX/G heterostructures could be
+promising candidates for high-performance optoelectronic devices.",2306.06690v1
+2023-10-27,Emergent spin-glass state in the doped Hund's metal CsFe2As2,"Hund's metal is one kind of correlated metal, in which the electronic
+correlation is strongly influenced by the Hund's interaction. At high
+temperatures, while the charge and orbital degrees of freedom are quenched, the
+spin degrees of freedom can persist in terms of frozen moments. As temperature
+decreases, a coherent electronic state with characteristic orbital
+differentiation always emerges at low temperatures through an
+incoherent-to-coherent crossover, which has been widely observed in iron-based
+superconductors (e.g., iron selenides and AFe2As2 (A = K, Rb, Cs)).
+Consequently, the above frozen moments are ""screened"" by coupling to orbital
+degrees of freedom, leading to an emergent Fermi-liquid state. In contrast, the
+coupling among frozen moments should impede the formation of the Fermi-liquid
+state by competitive magnetic ordering, which is still unexplored in Hund's
+metal. Here, in the iron-based Hund's metal CsFe2As2, we adopt a chemical
+substitution at iron sites by Cr/Co atoms to explore the competitive magnetic
+ordering. By a comprehensive study of resistivity, magnetic susceptibility,
+specific heat and nuclear magnetic resonance, we demonstrate that the
+Fermi-liquid state is destroyed in Cr-doped CsFe2As2 by a spinfreezing
+transition below T_g ~ 22 K. Meanwhile, the evolution of charge degrees of
+freedom measured by angle-resolved photoemission spectroscopy also supports the
+competition between the Fermi-liquid state and spin-glass state.",2310.17858v1
+2010-08-04,Sympathetic cooling of the Ba$^+$ ion by collisions with ultracold Rb atoms: theoretical prospects,"State-of-the-art {\em ab initio} techniques have been applied to compute the
+potential energy curves of the (BaRb)$^+$ molecular ion in the Born-Oppenheimer
+approximation. The long-range coefficients describing the electrostatic,
+induction, and dispersion interactions at large interatomic distances are also
+reported. The electric transition dipole moments governing the X$^1\Sigma \to
+^1\Sigma, ^1\Pi$ have been obtained as the first residue of the polarization
+propagator computed with the linear response coupled-cluster method restricted
+to single and double excitations. Nonadiabatic radial and angular coupling
+matrix elements, as well as the spin-orbit coupling matrix elements have been
+evaluated using the multireference configuration interaction method restricted
+to single and double excitations with a large active space. With these
+couplings, the spin-orbit coupled (relativistic) potential energy curves for
+the 0$^+$ and 1 states relevant for the running experiments have been obtained.
+Finally, relativistic transition moments and nonadiabatic coupling matrix
+elements were obtained from the nonrelativistic results and spin-orbit
+eigenvectors. The electronic structure input has been employed in the single
+channel scattering calculations of the collisional cross sections between the
+Ba$^+$ ion and Rb atom. Both nonrelativistic and relativistic potentials were
+used in these calculations. Our results show that the inelastic cross section
+corresponding to the charge transfer from the Rb atom to the Ba$^+$ ion is much
+smaller than the elastic one over a wide range of energies up to 1 mK. This
+suggests that sympathetic cooling of the Ba$^+$ ion by collisions with
+ultracold Rb atoms should be possible.",1008.0840v2
+2007-07-20,Diamagnetism of doped two-leg ladders and probing the nature of their commensurate phases,"We study the magnetic orbital effect of a doped two-leg ladder in the
+presence of a magnetic field component perpendicular to the ladder plane.
+Combining both low-energy approach (bosonization) and numerical simulations
+(density-matrix renormalization group) on the strong coupling limit (t-J
+model), a rich phase diagram is established as a function of hole doping and
+magnetic flux. Above a critical flux, the spin gap is destroyed and a Luttinger
+liquid phase is stabilized. Above a second critical flux, a reentrance of the
+spin gap at high magnetic flux is found. Interestingly, the phase transitions
+are associated with a change of sign of the orbital susceptibility. Focusing on
+the small magnetic field regime, the spin-gapped superconducting phase is
+robust but immediately acquires algebraic transverse (i.e. along rungs) current
+correlations which are commensurate with the 4k_F density correlations. In
+addition, we have computed the zero-field orbital susceptibility for a large
+range of doping and interactions ratio J/t : we found strong anomalies at low
+J/t only in the vicinity of the commensurate fillings corresponding to delta =
+1/4 and 1/2. Furthermore, the behavior of the orbital susceptibility reveals
+that the nature of these insulating phases is different: while for delta = 1/4
+a 4k_F charge density wave is confirmed, the delta = 1/2 phase is shown to be a
+bond order wave.",0707.3017v3
+2010-07-12,Magnetic order in orbital models of the iron pnictides,"We examine the appearance of the experimentally-observed stripe
+spin-density-wave magnetic order in five different orbital models of the iron
+pnictide parent compounds. A restricted mean-field ansatz is used to determine
+the magnetic phase diagram of each model. Using the random phase approximation,
+we then check this phase diagram by evaluating the static spin susceptibility
+in the paramagnetic state close to the mean-field phase boundaries. The momenta
+for which the susceptibility is peaked indicate in an unbiased way the actual
+ordering vector of the nearby mean-field state. The dominant orbitally resolved
+contributions to the spin susceptibility are also examined to determine the
+origin of the magnetic instability. We find that the observed stripe magnetic
+order is possible in four of the models, but it is extremely sensitive to the
+degree of the nesting between the electron and hole Fermi pockets. In the more
+realistic five-orbital models, this order competes with a strong-coupling
+incommensurate state which appears to be controlled by details of the
+electronic structure below the Fermi energy. We conclude by discussing the
+implications of our work for the origin of the magnetic order in the pnictides.",1007.1949v2
+2017-08-04,Direct experimental observation of the molecular Jeff=3/2 ground state in the lacunar spinel GaTa4Se8,"Strong spin-orbit coupling lifts the degeneracy of t2g orbitals in 5d
+transition-metal systems, leaving a Kramers doublet and quartet with effective
+angular momentum of Jeff = 1/2 and 3/2, respectively. These spin-orbit
+entangled states can host exotic quantum phases such as topological Mott state,
+unconventional superconductivity, and quantum spin liquid. The lacunar spinel
+GaTa4Se8 was theoretically predicted to form the molecular Jeff = 3/2 ground
+state. Experimental verification of its existence is an important first step to
+exploring the consequences of the Jeff = 3/2 state. Here, we report direct
+experimental evidence of the Jeff = 3/2 state in GaTa4Se8 by means of
+excitation spectra of resonant inelastic x-rays scattering at the Ta L3 and L2
+edges. We found that the excitations involving the Jeff = 1/2 molecular orbital
+were suppressed only at the Ta L2 edge, manifesting the realization of the
+molecular Jeff = 3/2 ground state in GaTa4Se8.",1708.01416v2
+2017-04-28,Confinement-driven electronic and topological phases in corundum-derived $3d$-oxide honeycomb lattices,"Using density functional theory calculations including an on-site Coulomb
+term, we explore electronic and possibly topologically nontrivial phases in
+$3d$ transition metal oxide honeycomb layers confined in the corundum structure
+($\alpha$-Al$_2$O$_3$) along the [0001] direction. In most cases the ground
+state is a trivial antiferromagnetic Mott insulator, often with distinct
+orbital or spin states compared to the bulk phases. With imposed symmetry of
+the two sublattices the ferromagnetic phases of Ti, Mn, Co and Ni exhibit a
+characteristic set of four bands, two relatively flat and two with a Dirac
+crossing at K, associated with the single electron occupation of $e_{g}'$ (Ti)
+or $e_{g}$ (Mn, Co, Ni) orbitals. Our results indicate that the Dirac point can
+be tuned to the Fermi level using strain. Applying spin-orbit coupling (SOC)
+leads to a substantial anomalous Hall conductivity with values up to 0.94
+$e^2/h$. Moreover, at $a_{Al_2O_3}$=4.81\AA\ we identify a particularly strong
+effect of SOC with out-of-plane easy axis for
+($Ti_2$O$_3$)$_1$/(Al$_2$O$_3$)$_5$(0001) which stabilizes dynamically the
+system. Due to the unusually high orbital moment of -0.88$\mu_{\rm B}$ that
+nearly compensates the spin moment of 1.01$\mu_{\rm B}$, this system emerges as
+a candidate for the realization of the topological Haldane model of spinless
+fermions. Parallels to the perovskite analogs
+(La$X$O$_3$)$_2$/(LaAlO$_3$)$_4$(111) are discussed.",1704.08981v2
+2014-05-07,On the tidal origin of hot Jupiter stellar obliquity trends,"It is debated whether the two hot Jupiter populations --- those on orbits
+misaligned from their host star's spin axis and those well-aligned --- result
+from two migration channels or from two tidal realignment regimes. Here I
+demonstrate that equilibrium tides raised by a planet on its star can account
+for three observed spin-orbit alignment trends: the aligned orbits of hot
+Jupiters orbiting cool stars, the planetary mass cut-off for retrograde
+planets, and the stratification by planet mass of cool host stars' rotation
+frequencies. The first trend can be caused by strong versus weak magnetic
+braking (the Kraft break), rather than realignment of the star's convective
+envelope versus the entire star. The second trend can result from a small
+effective stellar moment of inertia participating in the tidal realignment in
+hot stars, enabling massive retrograde planets to partially realign to become
+prograde. The third trend is attributable to higher mass planets more
+effectively counteracting braking to spin up their stars. Both hot and cool
+star require a small effective stellar moment of inertia participating in the
+tidal realignment, e.g., an outer layer weakly coupled to the interior. I
+demonstrate via Monte Carlo that this model can match the observed trends and
+distributions of sky-projected misalignments and stellar rotation frequencies.
+I discuss implications for inferring hot Jupiter migration mechanisms from
+obliquities, emphasizing that even hot stars do not constitute a pristine
+sample.",1405.1735v2
+2017-05-19,Pressure-tuning of bond-directional exchange interactions and magnetic frustration in hyperhoneycomb iridate $β$-$\mathrm{Li_2IrO_3}$,"We explore the response of Ir $5d$ orbitals to pressure in
+$\beta$-$\mathrm{Li_2IrO_3}$, a hyperhoneycomb iridate in proximity to a Kitaev
+quantum spin liquid (QSL) ground state. X-ray absorption spectroscopy reveals a
+reconstruction of the electronic ground state below 2 GPa, the same pressure
+range where x-ray magnetic circular dichroism shows an apparent collapse of
+magnetic order. The electronic reconstruction, which manifests a reduction in
+the effective spin-orbit (SO) interaction in $5d$ orbitals, pushes
+$\beta$-$\mathrm{Li_2IrO_3}$ further away from the pure $J_{\rm eff}=1/2$
+limit. Although lattice symmetry is preserved across the electronic transition,
+x-ray diffraction shows a highly anisotropic compression of the hyperhoneycomb
+lattice which affects the balance of bond-directional Ir-Ir exchange
+interactions driven by spin-orbit coupling at Ir sites. An enhancement of
+symmetric anisotropic exchange over Kitaev and Heisenberg exchange interactions
+seen in theoretical calculations that use precisely this anisotropic Ir-Ir bond
+compression provides one possible route to realization of a QSL state in this
+hyperhoneycomb iridate at high pressures.",1705.07059v3
+2020-05-06,Nonlinear dynamical tides in white dwarf binaries,"Compact white dwarf (WD) binaries are important sources for space-based
+gravitational-wave (GW) observatories, and an increasing number of them are
+being identified by surveys like ZTF. We study the effects of nonlinear
+dynamical tides in such binaries. We focus on the global three-mode parametric
+instability and show that it has a much lower threshold energy than the local
+wave-breaking condition studied previously. By integrating networks of coupled
+modes, we calculate the tidal dissipation rate as a function of orbital period.
+We construct phenomenological models that match these numerical results and use
+them to evaluate the spin and luminosity evolution of a WD binary. While in
+linear theory the WD's spin frequency can lock to the orbital frequency, we
+find that such a lock cannot be maintained when nonlinear effects are taken
+into account. Instead, as the orbit decays, the spin and orbit go in and out of
+synchronization. Each time they go out of synchronization, there is a brief but
+significant dip in the tidal heating rate. While most WDs in compact binaries
+should have luminosities that are similar to previous traveling-wave estimates,
+a few percent should be about ten times dimmer because they reside in heating
+rate dips. This offers a potential explanation for the low luminosity of the CO
+WD in J0651. Lastly, we consider the impact of tides on the GW signal and show
+that LISA and TianGO can constrain the WD's moment of inertia to better than 1%
+for deci-Hz systems.",2005.03058v1
+2021-03-19,"Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties","We study the interplay between Mott physics, driven by Coulomb repulsion U,
+and Hund physics, driven by Hund's coupling J, for a minimal model for Hund
+metals, the orbital-symmetric three-band Hubbard-Hund model (3HHM) for a
+lattice filling of 1/3. Hund-correlated metals are characterized by
+spin-orbital separation (SOS), a Hund's-rule-induced two-stage Kondo-type
+screening process, in which spin screening occurs at much lower energy scales
+than orbital screening. By contrast, in Mott-correlated metals, lying close to
+the phase boundary of a metal-insulator transition, the SOS window becomes
+negligibly small and the Hubbard bands are well separated. Using dynamical
+mean-field theory and the numerical renormalization group as real-frequency
+impurity solver, we identify numerous fingerprints distinguishing Hundness from
+Mottness in the temperature dependence of various physical quantities. These
+include ARPES-type spectra, the local self-energy, static local orbital and
+spin susceptibilities, resistivity, thermopower, and lattice and impurity
+entropies. Our detailed description of the behavior of these quantities within
+the context of a simple model Hamiltonian will be helpful for distinguishing
+Hundness from Mottness in experimental and theoretical studies of real
+materials.",2103.11045v3
+2021-12-06,Role of Spin-Orbit Coupling in High-order Harmonic Generation Revealed by Super-Cycle Rydberg Trajectories,"High-harmonic generation is typically thought of as a sub-laser-cycle
+process, with the electron's excursion in the continuum lasting a fraction of
+the optical cycle. However, it was recently suggested that long-lived Rydberg
+states can play a particularly important role in atoms driven by the
+combination of the counter-rotating circularly polarized fundamental light
+field and its second harmonic. Here we report direct experimental evidence of
+long and stable Rydberg trajectories contributing to high-harmonic generation.
+We confirm their effect on the harmonic emission via Time-Dependent
+Schr{\""o}dinger Equation simulations and track their dynamics inside the laser
+pulse using the spin-orbit evolution in the ionic core, utilizing the
+spin-orbit Larmor clock. Our observations contrast sharply with the general
+view that long-lived Rydberg orbits should generate negligible contribution to
+the macroscopic far-field high harmonic response of the medium. Indeed, we show
+how and why radiation from such states can lead to well collimated macroscopic
+signal in the far field.",2112.02981v3
+2021-12-26,Quark spin-orbit correlations in the proton,"Generalized transverse momentum-dependent parton distributions (GTMDs)
+provide a comprehensive framework for imaging the internal structure of the
+proton. In particular, by encoding the simultaneous distribution of quark
+transverse positions and momenta, they allow one to directly access
+longitudinal quark orbital angular momentum, and, moreover, to correlate it
+with the quark helicity. The relevant GTMD is evaluated through a lattice
+calculation of a proton matrix element of a quark bilocal operator (the
+separation in which is Fourier conjugate to the quark momentum) featuring a
+momentum transfer (which is Fourier conjugate to the quark position), as well
+as the Dirac structure appropriate for capturing the quark helicity. The
+weighting by quark transverse position requires a derivative with respect to
+momentum transfer, which is obtained in unbiased fashion using a direct
+derivative method. The lattice calculation is performed directly at the
+physical pion mass, using domain wall fermions to mitigate operator mixing
+effects. Both the Jaffe-Manohar as well as the Ji quark spin-orbit correlations
+are extracted, yielding evidence for a strong quark spin-orbit coupling in the
+proton.",2112.13464v1
+2017-09-01,Scaling of the Rashba spin-orbit torque in magnetic domain walls,"Spin-orbit torque in magnetic domain walls was investigated by solving the
+Pauli-Schr\""{o}dinger equation for the itinerant electrons. The Rashba
+interaction considered is derived from the violation of inversion symmetry at
+interfaces between ferromagnets and heavy metals. In equilibrium, the Rashba
+spin-orbit interaction gives rise to a torque corresponding to the
+Dzyaloshinskii-Moriya interaction. When there is a current flowing, the
+spin-orbit torque experienced by the itinerant electrons in short domain walls
+has both field-like and damping-like components. However, when the domain wall
+width is increased, the damping-like component, which is the counterpart of the
+non-adiabatic spin transfer torque, decreases rapidly at the domain wall
+center. In contrast to the non-adiabatic spin transfer torque, the damping-like
+spin-orbit torque does not approach to zero far away from the domain wall
+center, even in the adiabatic limit. The scattering of spin-up and spin-down
+wave functions, which is caused by the Rashba spin-orbit interaction and the
+spatial variation of magnetization profile in the domain wall, gives rise to
+the finite damping-like spin-orbit torque.",1709.00187v3
+2024-01-17,Torque-dependent orbital modulation of X-ray pulsar Cen X-3,"Cen X-3 shows alternate spin-up/spin-down episodes lasting for tens of days.
+We study the orbital profiles and spectra of Cen X-3 during these
+spin-up/spin-down intervals, using long-term data monitored by Fermi/GBM,
+Swift/BAT and MAXI/GSC. In spin-up intervals, its orbital profile in 2-10 keV
+is symmetrically peaked around orbital phase 0.42, while in spin-down intervals
+of similar fluxes and similar magnitudes of spin change rate, its profile
+reaches a peak around orbital phase 0.22 and then declines gradually. Such a
+distinct orbital difference between spin-up and spin-down states of similar
+flux is hard to explain in the standard disk model and indicates that its
+torque reversals are related to processes on the orbital scale. The durations
+of continuous spin-up/spin-down trend (tens of days) also point to a
+superorbital variation. One possible scenario is the irradiation-driven warping
+disk instability, which may produce a flipped inner disk for tens of days.",2401.09197v1
+2018-12-11,Out-of-time-ordered correlators of the Hubbard model: SYK strange metal in the spin freezing crossover region,"The Sachdev-Ye-Kitaev (SYK) model describes a strange metal that shows
+peculiar non-Fermi liquid properties without quasiparticles. It exhibits a
+maximally chaotic behavior characterized by out-of-time-ordered correlators
+(OTOCs), and is expected to be a holographic dual to black holes. Recently, a
+striking similarity between the SYK model and the Hund-coupling induced
+spin-freezing crossover in multi-orbital Hubbard models has been pointed out.
+To further explore this connection, we study OTOCs for fermionic Hubbard
+models, which are prototypical models for strongly correlated electrons in
+solids. We introduce an imaginary-time four-point correlation function with an
+appropriate time ordering, which by means of the spectral representation and
+the out-of-time-order fluctuation-dissipation theorem can be analytically
+continued to real-time OTOCs. Based on this approach, we numerically evaluate
+real-time OTOCs for Hubbard models in the thermodynamic limit, using the
+dynamical mean-field theory in combination with a numerically exact
+continuous-time Monte Carlo impurity solver. The results for the single-orbital
+model show that a certain spin-related OTOC captures local moment formation in
+the vicinity of the metal-insulator transition, while the self-energy does not
+show SYK-like non-Fermi liquid behavior. On the other hand, for the two- and
+three-orbital models with nonzero Hund coupling we find that the OTOC exhibits
+a rapid damping at short times and an approximate power-law decay at longer
+times in the spin-freezing crossover regime characterized by fluctuating local
+moments and a non-Fermi liquid self-energy $\Sigma(\omega) \sim \sqrt{\omega}$.
+These results are in a good agreement with the behavior of the SYK model,
+providing firm evidence for the close relation between the spin-freezing
+crossover physics of multi-orbital Hubbard models and the SYK strange metal.",1812.04217v2
+2010-10-13,Electric-field control of spin waves at room temperature in multiferroic BiFeO3,"To face the challenges lying beyond current CMOS-based technology, new
+paradigms for information processing are required. Magnonics proposes to use
+spin waves to carry and process information, in analogy with photonics that
+relies on light waves, with several advantageous features such as potential
+operation in the THz range and excellent coupling to spintronics. Several
+magnonic analog and digital logic devices have been proposed, and some
+demonstrated. Just as for spintronics, a key issue for magnonics is the large
+power required to control/write information (conventionally achieved through
+magnetic fields applied by strip lines, or by spin transfer from large
+spin-polarized currents). Here we show that in BiFeO3, a room-temperature
+magnetoelectric material, the spin wave frequency (>600 GHz) can be tuned
+electrically by over 30%, in a non-volatile way and with virtually no power
+dissipation. Theoretical calculations indicate that this effect originates from
+a linear magnetoelectric effect related to spin-orbit coupling induced by the
+applied electric field. We argue that these properties make BiFeO3 a promising
+medium for spin wave generation, conversion and control in future magnonics
+architectures.",1010.2678v1
+2019-12-16,Electrically controlled emission from triplet charged excitons in atomically thin heterostructures,"Excitons are composite bosons that can feature spin singlet and triplet
+states. In usual semiconductors, without an additional spin-flip mechanism,
+triplet excitons are extremely inefficient optical emitters. Large spin-orbit
+coupling in transition metal dichalcogenides (TMDs) couples circularly
+polarized light to excitons with selective valley and spin. Here, we
+demonstrate electrically controlled brightening of spin-triplet interlayer
+excitons in a MoSe$_2$/WSe$_2$ TMD van der Waals (vdW) heterostructure. The
+atomic registry of vdW layers in TMD heterostructures provides a quasi-angular
+momentum to interlayer excitons, enabling emission from otherwise dark
+spin-triplet excitons. Employing magnetic field, we show that photons emitted
+by triplet and singlet excitons in the same valley have opposite chirality. We
+also measure effective exciton g-factors, presenting direct and quantitative
+evidence of triplet interlayer excitons. We further demonstrate gate tuning of
+the relative photoluminescence intensity between singlet and triplet charged
+excitons. Electrically controlled emission between singlet and triplet excitons
+enables a route for optoelectronic devices that can configure excitonic chiral,
+spin, and valley quantum states.",1912.07678v1
+2021-03-31,Resistively detected NMR as a probe of the topological nature of conducting edge/surface states,"Electron spins in edge or surface modes of topological insulators (TIs) with
+strong spin-orbit coupling cannot be directly manipulated with microwaves due
+to the locking of electron spin to its momentum. We show by contrast that a
+resistively detected nuclear magnetic resonance (RDNMR) based technique can be
+used to probe the helical nature of surface conducting states. In such
+experiments, one applies a radio frequency (RF) field to reorient nuclear spins
+that then couple to electronic spins by the hyperfine interaction. The spin of
+the boundary electrons can thereby be modulated, resulting in changes in
+conductance at nuclear resonance frequencies. Here, we demonstrate that the
+conductivity is sensitive to the direction of the applied magnetic field with
+respect to the helicity of the electrons. This dependence of the RDNMR signal
+on angle probes the nature of the conductive edge or surface states. In the
+case of 3D TI in the quantum Hall regime, we establish that the dominant
+mechanism responsible for the conductance change in a RDNMR experiment is based
+on the Overhauser field effect. Our findings indicate that the same physics
+underlying the use of RDNMR to probe TI states also enables us to use RF
+control of nuclear spins to coherently manipulate topologically protected
+states which could be useful for a new generation of devices.",2104.00146v2
+2019-05-10,Functional renormalization group for frustrated magnets with nondiagonal spin interactions,"In the field of quantum magnetism, the advent of numerous spin-orbit assisted
+Mott insulating compounds, such as the family of Kitaev materials, has led to a
+growing interest in studying general spin models with non-diagonal interactions
+that do not retain the SU(2) invariance of the underlying spin degrees of
+freedom. However, the exchange frustration arising from these non-diagonal and
+often bond-directional interactions for two- and three-dimensional lattice
+geometries poses a serious challenge for numerical many-body simulation
+techniques. In this paper, we present an extended formulation of the
+pseudo-fermion functional renormalization group that is capable of capturing
+the physics of frustrated quantum magnets with generic (diagonal and
+off-diagonal) two-spin interaction terms. Based on a careful symmetry analysis
+of the underlying flow equations, we reveal that the computational complexity
+grows only moderately, as compared to models with only diagonal interaction
+terms. We apply the formalism to a kagome antiferromagnet which is augmented by
+general in-plane and out-of-plane Dzyaloshinskii-Moriya (DM) interactions, as
+argued to be present in the spin liquid candidate material herbertsmithite. We
+calculate the complete ground state phase diagram in the strength of in-plane
+and out-of-plane DM couplings, and discuss the extended stability of the spin
+liquid of the unperturbed kagome antiferromagnet in the presence of these
+couplings.",1905.04190v2
+2021-10-19,Non-reciprocal Pauli Spin Blockade in a Silicon Double Quantum Dot,"Spin qubits in gate-defined silicon quantum dots are receiving increased
+attention thanks to their potential for large-scale quantum computing. Readout
+of such spin qubits is done most accurately and scalably via Pauli spin
+blockade (PSB), however various mechanisms may lift PSB and complicate readout.
+In this work, we present an experimental observation of a new, highly prevalent
+PSB-lifting mechanism in a silicon double quantum dot due to incoherent
+tunneling between different spin manifolds. Through dispersively-detected
+magnetospectroscopy of the double quantum dot in 16 charge configurations, we
+find the mechanism to be energy-level selective and non-reciprocal for
+neighbouring charge configurations. Additionally, using input-output theory we
+report a large coupling of different electron spin manifolds of 7.90 $\mu$eV,
+the largest reported to date, indicating an enhanced spin-orbit coupling which
+may enable all-electrical qubit control.",2110.09842v2
+2023-03-09,Electrical manipulation of a single electron spin in CMOS with micromagnet and spin-valley coupling,"For semiconductor spin qubits, complementary-metal-oxide-semiconductor (CMOS)
+technology is the ideal candidate for reliable and scalable fabrication. Making
+the direct leap from academic fabrication to qubits fabricated fully by
+industrial CMOS standards is difficult without intermediate solutions. With a
+flexible back-end-of-line (BEOL) new functionalities such as micromagnets or
+superconducting circuits can be added in a post-CMOS process to study the
+physics of these devices or achieve proof of concepts. Once the process is
+established it can be incorporated in the foundry-compatible process flow.
+Here, we study a single electron spin qubit in a CMOS device with a micromagnet
+integrated in the flexible BEOL. We exploit the synthetic spin orbit coupling
+(SOC) to control the qubit via electric field and we investigate the
+spin-valley physics in the presence of SOC where we show an enhancement of the
+Rabi frequency at the spin-valley hotspot. Finally, we probe the high frequency
+noise in the system using dynamical decoupling pulse sequences and demonstrate
+that charge noise dominates the qubit decoherence in this range.",2303.04960v1
+2023-08-11,Design of Sn-doped cadmium chalcogenide based monolayers for valleytronics properties,"Valleytronics, that uses the valley index or valley pseudospin to encode
+information, has emerged as an interesting field of research in two-dimensional
+(2D) systems with promising device applications. Spin-orbit coupling (SOC) and
+inversion symmetry breaking leads to spin-splitting of bands near the energy
+extrema (valleys). In order to find a new 2D material useful for valleytronics,
+we have designed hexagonal planar monolayers of cadmium chalcogenides (CdX, X =
+S, Se, Te) from the (111) surface of bulk CdX zinc blende structure. Band
+structure study reveals valence band local maxima at symmetry point K and its
+time reversal conjugate point K$\textquotesingle$. Application of SOC initiates
+spin-splitting in the valleys that lifts the energy degeneracy and shows strong
+valley-spin coupling character. We have substituted two Cd atoms in the planar
+monolayers by Sn atoms which increases the spin-splitting significantly. The
+structural, dynamic, mechanical and thermal stability of all the monolayers has
+been confirmed. Values of formation energies indicate that it may be feasible
+to synthesize the Sn-doped CdSe and CdTe monolayers using bottom-up approach.
+Zeeman-type spin-splitting is observed in the valley region and Rashba
+spin-splitting is observed at the $\Gamma$ point for Sn-doped CdSe and CdTe
+monolayers. Berry curvature values are more in all the Sn-doped monolayers than
+the pristine monolayers. These newly designed monolayers are thus found to be
+suitable for valleytronics applications. Sn-doped monolayers show band
+inversion deep in the valence and conduction bands between Sn~$s$ and $p$ and
+X~$p$ states but lack topological properties.",2308.06011v1
+2023-09-04,Impact of electrostatic crosstalk on spin qubits in dense CMOS quantum dot arrays,"Quantum processors based on integrated nanoscale silicon spin qubits are a
+promising platform for highly scalable quantum computation. Current CMOS spin
+qubit processors consist of dense gate arrays to define the quantum dots,
+making them susceptible to crosstalk from capacitive coupling between a dot and
+its neighbouring gates. Small but sizeable spin-orbit interactions can transfer
+this electrostatic crosstalk to the spin g-factors, creating a dependence of
+the Larmor frequency on the electric field created by gate electrodes
+positioned even tens of nanometers apart. By studying the Stark shift from tens
+of spin qubits measured in nine different CMOS devices, we developed a
+theoretical frawework that explains how electric fields couple to the spin of
+the electrons in increasingly complex arrays, including those electric
+fluctuations that limit qubit dephasing times $T_2^*$. The results will aid in
+the design of robust strategies to scale CMOS quantum technology.",2309.01849v1
+2017-05-03,"Interacting chains of orbital polarons in ""Colossal"" magnetoresistive La1-xSrxMnO3 revealed by spin and lattice dynamics","The origin of the effect of colossal magneto-resistance (CMR) remains still
+unexplained. In this work we revisit the spin dynamics of the pseudo-cubic
+La1-xSrxMnO3 along the Mn-O-Mn bond direction at four x doping values (x < 0.5)
+and various temperatures and report a new lattice dynamics study at x0=0.2,
+representative of the optimal doping for CMR. We propose an interpretation of
+the spin dynamics in terms of orbital polarons. This picture is supported by
+the observation of a discrete magnetic energy spectrum Enmag (q) characteristic
+of the internal excitations of ""orbital polarons"" defined by Mn3+ neighbors
+surrounding a Mn4+ center with a hole. Because of its hopping, the hole mixes
+up dynamically all the possible orbital configurations of its surrounding Mn3+
+sites with degenerate energies. The Enmag values indicate a lift of orbital
+degeneracy by phonon excitations. The number n varies with the spatial
+dimension D of the polaron and the q-range determines its size. At x=0.125 and
+x=0.3 the spectrum reveals 2D polarons coupled by exchange and 3D ""free""
+polarons respectively, with sizes l=1.67a < 2a in all bond directions. At
+x0=0.2, the spin and the lattice dynamics provide evidence for chains of
+orbital polarons of size l=2a with a periodic distribution over ~ 3a and an
+interaction energy ~ 3 meV. At T < Tc the charges propagate together with the
+longitudinal acoustic phonons along the chains enhancing their ferromagnetic
+character. The phase separation between metallic and ferromagnetic chains in a
+non-metallic matrix may be crucial for CMR.",1705.01476v3
+2010-03-09,Self force on a scalar charge in Kerr spacetime: circular equatorial orbits,"We present a calculation of the scalar field self-force (SSF) acting on a
+scalar-charge particle in a strong-field orbit around a Kerr black hole. Our
+calculation specializes to circular and equatorial geodesic orbits. The
+analysis is an implementation of the standard mode-sum regularization scheme:
+We first calculate the multipole modes of the scalar-field perturbation using
+numerical integration in the frequency domain, and then apply a certain
+regularization procedure to each of the modes. The dissipative piece of the SSF
+is found to be consistent with the flux of energy and angular momentum carried
+by the scalar waves through the event horizon and out to infinity. The
+conservative (radial) component of the SSF is found to be attractive (inward
+pointing) for $r_0>r_{\rm c}(a)$ and repulsive (outward pointing) for
+$r_0<r_{\rm c}(a)$, where $a$ is the Kerr spin parameter, $r_0$ is the
+Boyer-Lindquist orbital radius, and $r_{\rm c}$ is a critical $a$-dependent
+radius at which the conservative SSF vanishes. When the motion is retrograde
+the conservative SSF is repulsive for all $r_0$ (as in the Schwarzschild case).
+The dominant conservative effect of the SSF in Schwarzschild spacetime is known
+to be of 3rd post-Newtonian (PN) order (with a logarithmic running). Our
+numerical results suggest that the leading-order PN correction due to the black
+hole's spin arises from spin-orbit coupling at 3PN, which dominates the overall
+SSF effect at large $r_0$. In PN language, the change-of-sign of the radial SSF
+is attributed to an interplay between the spin-orbit term ($\propto
+-ar_0^{-4.5}$) and the ""Schwarzschild"" term ($\propto r_0^{-5}\log r_0$).",1003.1860v3
+2009-08-18,"""Spin"" and ""Orbital"" Flows in a Circularly Polarized Paraxial Beam: Orbital Rotation without Orbital Angular Momentum","In light beams with circular or elliptic polarization, the transverse energy
+flow consists of the ""spin"" and ""orbital"" parts. Both of them can induce the
+orbital motion of microparticles suspended within the field of a light beam,
+and this should be taken into account in experiments on the spin-to-orbital
+angular momentum conversion. The character of the spin, orbital and total
+transverse energy flows in circular Laguerre-Gaussian beams is studied
+analytically; graphical representations of the flows in the beam cross section
+(flow maps) are calculated and analyzed. The spin circulatory flow can be
+directed oppositely to the orbital one and/or to the polarization handedness.
+As a result, the total transverse energy circulation of a beam with homogeneous
+circular polarization can be of different handedness in different regions of
+the beam cross section, which are separated by the contours of zero transverse
+energy flow. Regarding the particle position within the beam cross section, it
+can perform orbital, spinning or combined spinning-orbital motion with variable
+parameters. Possible applications to optical driving of microparticles are
+discussed.",0908.2526v1
+2016-01-08,Detecting the orbital character of the spin fluctuation in the Iron-based superconductors with the resonant inelastic X-ray scattering spectroscopy,"The orbital distribution of the spin fluctuation in the iron-based
+superconductors(IBSs) is the key information needed to understand the
+magnetism, superconductivity and electronic nematicity in these multi-orbital
+systems. In this work, we propose that the resonant inelastic X-ray
+scattering(RIXS) technique can be used to probe selectively the spin
+fluctuation on different Fe $3d$ orbitals. In particular, the spin fluctuation
+on the three $t_{2g}$ orbitals, namely, the $3d_{xz}$, $3d_{yz}$ and the
+$3d_{xy}$ orbital, can be selectively probed in the $\sigma\rightarrow\pi'$
+scattering geometry by aligning the direction of the outgoing photon in the
+$y$, $x$ and $z$ direction. Such orbital-resolved information on the spin
+fluctuation is invaluable for the study of the orbital-selective physics in the
+IBSs and can greatly advance our understanding on the relation between orbital
+ordering and spin nematicity in the IBSs and the orbital-selective pairing
+mechanism in these multi-orbital systems.",1601.01809v3
+2021-09-29,Magnetic interlayer coupling between ferromagnetic SrRuO$_3$ layers through a SrIrO$_3$ spacer,"A key element to tailor the properties of magnetic multilayers is the
+coupling between the individual magnetic layers. In case of skyrmion hosting
+multilayers, coupling of skyrmions across the magnetic layers is highly
+desirable. Here the magnetic interlayer coupling was studied in epitaxial
+all-oxide heterostructures of ferromagnetic perovskite SrRuO$_3$ layers
+separated by spacers of the strong spin-orbit coupling oxide SrIrO$_3$. This
+combination of oxide layers is being discussed as a potential candidate system
+to host N\'{e}el skyrmions. First order reversal curve (FORC) measurements were
+performed in order to distinguish between magnetic switching processes of the
+individual layers and to disentangle the signal of soft magnetic impurities
+from the samples$'$ signal. Additionally, FORC investigations enabled to
+determine whether the coupling between the magnetic layers is ferromagnetic or
+antiferromagnetic. The observed interlayer coupling strength was weak for all
+the heterostructures, with SrIrO$_3$ spacers between 2 monolayers and 12
+monolayers thick.",2109.14292v2
+2003-05-19,Physics and Initial Data for Multiple Black Hole Spacetimes,"An orbiting black hole binary will generate strong gravitational radiation
+signatures, making these binaries important candidates for detection in
+gravitational wave observatories. The gravitational radiation is characterized
+by the orbital parameters, including the frequency and separation at the
+inner-most stable circular orbit (ISCO). One approach to estimating these
+parameters relies on a sequence of initial data slices that attempt to capture
+the physics of the inspiral. Using calculations of the binding energy, several
+authors have estimated the ISCO parameters using initial data constructed with
+various algorithms. In this paper we examine this problem using conformally
+Kerr-Schild initial data. We present convergence results for our initial data
+solutions, and give data from numerical solutions of the constraint equations
+representing a range of physical configurations. In a first attempt to
+understand the physical content of the initial data, we find that the Newtonian
+binding energy is contained in the superposed Kerr-Schild background before the
+constraints are solved. We examine some deficiencies with the initial data
+approach to orbiting binaries, especially touching on the effects of prior
+motion and spin-orbital coupling of the angular momenta. Making rough estimates
+of these effects, we find that they are not insignificant compared to the
+binding energy, leaving some doubt of the utility of using initial data to
+predict ISCO parameters. In computations of specific initial-data
+configurations we find spin-specific effects that are consistent with
+analytical estimates.",0305071v1
+2016-02-21,Orbital-selective Mott phases of a one-dimensional three-orbital Hubbard model studied using computational techniques,"A recently introduced one-dimensional three-orbital Hubbard model displays
+orbital-selective Mott phases with exotic spin arrangements such as spin block
+states [J. Rinc\'on {\em et al.}, Phys. Rev. Lett. \textbf{112}, 106405
+(2014)]. In this publication we show that the Constrained-Path Quantum Monte
+Carlo (CPQMC) technique can accurately reproduce the phase diagram of this
+multiorbital one-dimensional model, paving the way to future CPQMC studies in
+systems with more challenging geometries, such as ladders and planes. The
+success of this approach relies on using the Hartree-Fock technique to prepare
+the trial states needed in CPQMC. We also study a simplified version of the
+model where the pair-hopping term is neglected and the Hund coupling is
+restricted to its Ising component. The corresponding phase diagrams are shown
+to be only mildly affected by the absence of these technically
+difficult-to-implement terms. This is confirmed by additional Density Matrix
+Renormalization Group and Determinant Quantum Monte Carlo calculations carried
+out for the same simplified model, with the latter displaying only mild Fermion
+sign problems. We conclude that these methods are able to capture
+quantitatively the rich physics of the several orbital-selective Mott phases
+(OSMP) displayed by this model, thus enabling computational studies of the OSMP
+regime in higher dimensions, beyond static or dynamic mean field
+approximations.",1602.06478v2
+2017-10-20,"Reliability and applicability of magnetic force linear response theory: Numerical parameters, predictability, and orbital resolution","We investigated the reliability and applicability of so-called magnetic force
+linear response method to calculate spin-spin interaction strengths from
+first-principles. We examined the dependence on the numerical parameters
+including the number of basis orbitals and their cutoff radii within
+non-orthogonal LCPAO (linear combination of pseudo-atomic orbitals) formalism.
+It is shown that the parameter dependence and the ambiguity caused by these
+choices are small enough in comparison to the other computation approach and
+experiments. Further, we tried to pursue the possible extension of this
+technique to a wider range of applications. We showed that magnetic force
+theorem can provide the reasonable estimation especially for the case of
+strongly localized moments even when the ground state configuration is unknown
+or the total energy value is not accessible. The formalism is extended to carry
+the orbital resolution from which the matrix form of the magnetic coupling
+constant is calculated. From the applications to Fe-based superconductors
+including LaFeAsO, NaFeAs, BaFe$_2$As$_2$ and FeTe, the distinctive
+characteristics of orbital-resolved interactions are clearly noticed in between
+single-stripe pnictides and double-stripe chalcogenides.",1710.07533v1
+2022-02-28,Strongly anisotropic electronic and magnetic structures in oxide dichlorides RuOCl$_2$ and OsOCl$_2$,"Here, using density functional theory and density matrix renormalization
+group methods, we investigate the electronic and magnetic properties of
+RuOCl$_2$ and OsOCl$_2$ with $d^4$ electronic configurations. Different from a
+previous study using VOI$_2$ with $d^1$ configuration, these systems with
+$4d^4$ or $5d^4$ do not exhibit a ferroelectric instability along the $a$-axis.
+Due to the fully-occupied $d_{xy}$ orbital in RuOCl$_2$ and OsOCl$_2$, the
+Peierls instability distortion disappears along the $b$-axis, leading to an
+undistorted I${\rm mmm}$ phase (No. 71). Furthermore, we observe strongly
+anisotropic electronic and magnetic structures along the $a$-axis. The large
+crystal-field splitting energy (between $d_{xz/yz}$ and $d_{xy}$ orbitals) and
+large hopping between nearest-neighbor Ru and Os atoms suppresses the
+spin-orbital effect in $M$OCl$_2$ ($M$ = Ru or Os) with electronic density $n =
+4$, resulting in a spin-1 system instead of a $J = 0$ singlet ground state.
+Moreover, we find staggered antiferromagnetic order with $\pi$ wavevector along
+the $M$-O chain direction ($a$-axis) while the magnetic coupling along the
+$b$-axis is weak. Based on Wannier functions from first-principles
+calculations, we calculated the relevant hopping amplitudes and crystal-field
+splitting energies of the $t_{2g}$ orbitals for the Os atoms to construct a
+multi-orbital Hubbard model for the $M$-O chains. Staggered AFM with
+$\uparrow$-$\downarrow$-$\uparrow$-$\downarrow$ spin structure dominates in our
+DMRG calculations, in agreement with DFT calculations.",2203.00060v2
+2024-01-10,Observation of correlation induced metal to half-metal phase transition and large orbital moment in $\mathrm{Sr_2CoO_4}$,"We present a detailed mean-field study to address the fundamental discrepancy
+in the ground state magnetization of $\mathrm{Sr_{2}CoO_{4}}$ (SCO). In
+contrast to the ferromagnetic metallic ground state obtained from density
+functional theory (DFT), DFT+$U$ gives three ferromagnetic solutions converging
+to integer moment values (1, 2 \& 3 $\mu_B$/f.u) over a range of $U$.
+Interestingly, two of the solutions are found to exhibit half-metallicity with
+correspondingly $S$=1/2 and S=3/2 spin states. The half-metallic ferromagnetic
+state with $S$=3/2 is found to be the ground state solution for SCO. Co atoms
+show a large deviation from the formal +4 oxidation state indicating the
+presence of strong covalency effects. Our results suggest a plausible metal to
+half-metal phase transition around $U$($J$)=4.4(1.16) eV. The Fermi surface
+study shows gradual collapse in states leading to half-metallicity suggesting
+\textit{\textbf{k}}-dependence of effective $U$ around the critical region.
+Surprisingly, in the presence of spin-orbit coupling (SOC), unexpectedly large
+orbital moment ($L_{z}$=0.6) is noted in SCO putting it among the class of 3$d$
+based transition metal compounds exhibiting pronounced orbital magnetization.
+The calculations give large magnetocrystalline anisotropy energy (MAE) of
+$\sim$48 meV. Large values of orbital magnetic moment contribution and MAE, in
+the presence of strong correlation effects, provide a better interpretation of
+experimental magnetization observed in SCO.",2401.05149v1
+2019-07-02,"ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr2IrO4","Sr2IrO4 is characterized by a large spin-orbit coupling, which gives rise to
+bands with strongly entangled spin and orbital characters, called J=1/2 and
+J=3/2. We use light-polarization dependent ARPES to study directly the orbital
+character of these bands and fully map out their dispersion. We observe bands
+in very good agreement with our cluster dynamical mean-field theory
+calculations. We show that the J=1/2 band, the closest to the Fermi level Ef,
+is dominated by dxz character along kx and dyz along ky. This is actually in
+agreement with an isotropic J=1/2 character on average, but this large orbital
+dependence in k-space was mostly overlooked before. It gives rise to strong
+modulations of the ARPES intensity that we explain and carefully take into
+account to compare dispersions in equivalent directions of the Brillouin zone.
+Although the latter dispersions look different at first, suggesting possible
+symmetry breakings, they are found essentially similar, once corrected for
+these intensity variations. In particular, the pseudogap-like features close to
+the $X$ point appearing in the nearly metallic 15% Rh-doped Sr2IrO4 strongly
+depend on experimental conditions. We reveal that there is nevertheless an
+energy scale of 30meV below which spectral weight is suppressed, independent of
+the experimental conditions, which gives a reliable basis to analyze this
+behavior. We suggest it is caused by disorder.",1907.01247v1
+2021-10-06,Epitaxial Growth of Ultraflat Bismuthene with Large Topological Band Inversion Enabled by Substrate-Orbital-Filtering Effect,"Quantum spin Hall (QSH) systems hold promises of low-power-consuming
+spintronic devices, yet their practical applications are extremely impeded by
+the small energy gaps. Fabricating QSH materials with large gaps, especially
+under the guidance of design principles, is essential for both scientific
+research and practical applications. Here, we demonstrate that large on-site
+atomic spin-orbit coupling can be directly exploited via the intriguing
+substrate-orbital-filtering effect to generate large-gap QSH systems and
+experimentally realized on the epitaxially synthesized ultraflat bismuthene on
+Ag(111). Theoretical calculations reveal that the underlying substrate
+selectively filters Bi pz orbitals away from the Fermi level, leading pxy
+orbitals with nonzero magnetic quantum numbers, resulting in large topological
+gap of ~1 eV at the K point. The corresponding topological edge states are
+identified through scanning tunneling spectroscopy combined with density
+functional theory calculations. Our findings provide general strategies to
+design large-gap QSH systems and further explore their topology-related
+physics.",2110.02461v2
+2022-02-11,DFT+$U$ within the framework of linear combination of numerical atomic orbitals,"We present a formulation and implementation of the DFT+\textit{U} method
+within the framework of linear combination of numerical atomic orbitals (NAO).
+Our implementation not only enables single-point total energy and
+electronic-structure calculations but also provides access to atomic forces and
+stresses, hence allowing for full structure relaxations of periodic systems.
+Furthermore, our implementation allows one to deal with non-collinear spin
+texture, with the spin-orbit coupling (SOC) effect treated self-consistently.
+The key aspect behind our implementation is a suitable definition of the
+correlated subspace when multiple atomic orbitals with the same angular
+momentum are used, and this is addressed via the ""Mulliken charge projector""
+constructed in terms of the first (most localized) atomic orbital within the
+$d/f$ angular momentum channel. The important Hubbard $U$ and Hund $J$
+parameters can be estimated from a screened Coulomb potential of the Yukawa
+type, with the screening parameter either chosen semi-empirically or determined
+from the Thomas-Fermi screening model. Benchmark calculations are performed for
+four late transition metal monoxide bulk systems, i.e., MnO, FeO, CoO, and NiO,
+and for the 5$d$-electron compounds IrO$_2$. For the former type of systems, we
+check the performance of our DFT+$U$ implementation for calculating band gaps,
+magnetic moments, electronic band structures, as well as forces and stresses;
+for the latter, the efficacy of our DFT+$U$+SOC implementation is assessed.
+Systematic comparisons with available experimental results, and especially with
+the results from other implementation schemes are carried out, which
+demonstrate the validity of our NAO-based DFT+$U$ formalism and implementation.",2202.05409v1
+2008-12-16,Evidence for reversible control of magnetization in a ferromagnetic material via spin-orbit magnetic field,"Conventional computer electronics creates a dichotomy between how information
+is processed and how it is stored. Silicon chips process information by
+controlling the flow of charge through a network of logic gates. This
+information is then stored, most commonly, by encoding it in the orientation of
+magnetic domains of a computer hard disk. The key obstacle to a more intimate
+integration of magnetic materials into devices and circuit processing
+information is a lack of efficient means to control their magnetization. This
+is usually achieved with an external magnetic field or by the injection of
+spin-polarized currents. The latter can be significantly enhanced in materials
+whose ferromagnetic properties are mediated by charge carriers. Among these
+materials, conductors lacking spatial inversion symmetry couple charge currents
+to spin by intrinsic spin-orbit (SO) interactions, inducing nonequilibrium spin
+polarization tunable by local electric fields. Here we show that magnetization
+of a ferromagnet can be reversibly manipulated by the SO-induced polarization
+of carrier spins generated by unpolarized currents. Specifically, we
+demonstrate domain rotation and hysteretic switching of magnetization between
+two orthogonal easy axes in a model ferromagnetic semiconductor.",0812.3160v2
+2009-03-13,Unified Description of the Intrinsic Spin-Hall Effects,"The intrinsic spin-Hall effects (SHE) in $p$-doped semiconductors [S.
+Murakami et al., Science 301, 1348 (2003)] and two-dimensional electron gases
+with Rashba spin-orbit coupling [J. Sinova et al., Phys. Rev. Lett. 92, 126603
+(2004)] have been the subject of many theoretical studies, but their driving
+mechanisms have yet to be described in a unified manner. The former effect
+arises from the adiabatic topological curvature of momentum space, from which
+holes acquire a spin-dependent anomalous velocity. The SHE in the Rashba
+system, on the other hand, results from the momentum-dependent spin dynamics in
+the presence of an external electric field. The two effects clearly appear to
+originate from distinct mechanisms. Our motivation for this article is to
+address this apparent disparity and, in particular, to seek a unifying
+description of the effects. In this endeavor, we consider the explicit
+time-dependence of SHE systems starting with a general spin-orbit model. We
+find that by performing a gauge transformation of the general model with
+respect to time, a well-defined gauge field appears in time space which has the
+physical significance of an effective magnetic field. This magnetic field is
+shown to precisely account for the SHE in the Rashba system in the adiabatic
+limit. Remarkably, by carefully analyzing the equation of motion of the general
+model, this field component is also found to be the origin of the anomalous
+velocity due to the momentum space curvature. Our study therefore unifies the
+two seemingly disparate intrinsic SHEs under a common adiabatic framework.",0903.2305v2
+2014-07-18,"Production, storage and release of spin currents in quantum circuits","Quantum rings connected to ballistic circuits couple strongly to external
+magnetic fields if the connection is not symmetric. By analytical theory and
+computer simulation I show that properly connected rings can be used to pump
+currents in the wires giving raise to a number of interesting new phenomena.
+One can pump spin polarized currents into the wires by using rotating magnetic
+fields or letting the ring rotate around the wire. This method works without
+any need for the spin-orbit interaction, and without stringent requirements
+about the conduction band filling. On the other hand, another method works at
+half filling using a time-dependent magnetic field in the plane of the (fixed)
+ring. This can be used to pump a pure spin current, excited by the the
+spin-orbit interaction in the ring. One can use magnetizable bodies as storage
+units to concentrate and save the magnetization in much the same way as
+capacitors store electric charge. The polarization obtained in this way can
+then be used on command to produce spin currents in a wire. These currents show
+interesting oscillations while the storage units exchange their polarizations
+and the intensity and amplitude of the oscillations can controlled by tuning
+the conductance of the wire used to connect the units.",1407.4983v2
+2017-03-10,Superexchange theory of electronic polarization driven by relativistic spin-orbit interaction at the half-filling,"By applying Berry-phase theory for the effective half-filled Hubbard model,
+we derive an analytical expression for the electronic polarization driven by
+the relativistic spin-orbit (SO) coupling. The model itself is constructed in
+the Wannier basis, using the input from the first-principles electronic
+structure calculations in the local-density approximation, and then treated in
+the spirit of the superexchange theory. The obtained polarization has the
+following form: ${\bf P}_{ij} = \boldsymbol{\epsilon}_{ji} \boldsymbol{\cal
+P}_{ij} \cdot [\boldsymbol{e}_i \times \boldsymbol{e}_j]$, where
+$\boldsymbol{\epsilon}_{ji}$ is the direction of the bond $\langle ij \rangle$,
+$\boldsymbol{e}_i$ and $\boldsymbol{e}_j$ are the directions of spins in this
+bond, and $\boldsymbol{\cal P}_{ij}$ is the pseudovector containing all the
+information about the crystallographic symmetry of the considered system. The
+expression describes the ferroelectric activity in various magnets with
+noncollinear but otherwise nonpolar magnetic structures, which would yield no
+polarization without SO interaction, including the magnetoelectric (ME) effect,
+caused by the ferromagnetic canting of spins in the external magnetic field,
+and spin-spiral multiferroics. The abilities of this theory are demonstrated
+for the the analysis of linear ME effect in Cr$_2$O$_3$ and BiFeO$_3$ and
+properties multiferroic MnWO$_4$ and $\beta$-MnO$_2$. In all considered
+examples, the theory perfectly describes the symmetry properties of the induced
+polarization. However, in some cases, the values of this polarization are
+underestimated, suggesting that other effects, besides the spin and electronic
+ones, can also play an important role.",1703.03556v1
+2018-02-27,Spin-polaron ladder spectrum of the spin-orbit-induced Mott insulator Sr$_2$IrO$_{4}$ probed by scanning tunneling spectroscopy,"The motion of doped electrons or holes in an antiferromagnetic lattice with
+strong on-site Coulomb interactions touches one of the most fundamental open
+problems in contemporary condensed matter physics. The doped charge may
+strongly couple to elementary spin excitations resulting in a dressed
+quasiparticle which is subject to confinement. This 'spin-polaron' possesses
+internal degrees of freedom with a characteristic 'ladder' excitation spectrum.
+Despite its fundamental importance for understanding high-temperature
+superconductivity, clear experimental spectroscopic signatures of these
+internal degrees of freedom are scarce. Here we present scanning tunneling
+spectroscopy results of the spin-orbit-induced Mott insulator Sr$_2$IrO$_{4}$.
+Our spectroscopy data reveal distinct shoulder-like features for occupied and
+unoccupied states beyond a measured Mott gap of $\Delta\approx620$~meV. Using
+the self-consistent Born approximation we assign the anomalies in the
+unoccupied states to the spin-polaronic ladder spectrum with excellent
+quantitative agreement and estimate the Coulomb repulsion $U$ = 2.05 ...2.28 eV
+in this material. These results confirm the strongly correlated electronic
+structure of this compound and underpin the previously conjectured paradigm of
+emergent unconventional superconductivity in doped Sr$_2$IrO$_{4}$.",1802.10028v3
+2018-01-12,First-order symmetry-adapted perturbation theory for multiplet splittings,"We present a symmetry-adapted perturbation theory (SAPT) for the interaction
+of two high-spin open-shell molecules (described by their restricted open-shell
+Hartree-Fock determinants) resulting in low-spin states of the complex. The
+previously available SAPT formalisms, except for some system-specific studies
+for few-electron complexes, were restricted to the high-spin state of the
+interacting system. Thus, the new approach provides, for the first time, a
+SAPT-based estimate of the splittings between different spin states of the
+complex. We have derived and implemented the lowest-order SAPT term responsible
+for these splittings, that is, the first-order exchange energy. We show that
+within the so-called S2 approximation commonly used in SAPT (neglecting effects
+that vanish as fourth or higher powers of intermolecular overlap integrals),
+the first-order exchange energies for all multiplets are linear combinations of
+two matrix elements: a diagonal exchange term that determines the spin-averaged
+effect and a {\em spin-flip term} responsible for the splittings between the
+states. The numerical factors in this linear combination are determined solely
+by the Clebsch-Gordan coefficients: accordingly, the S2 approximation implies a
+Heisenberg Hamiltonian picture with a single coupling strength parameter
+determining all the splittings. The new approach is cast into both
+molecular-orbital and atomic-orbital expressions: the latter enable an
+efficient density-fitted implementation. We test the newly developed formalism
+on several open-shell complexes ranging from diatomic systems (Li+H, Mn+Mn,...)
+to the phenalenyl dimer.",1801.04078v1
+2020-02-12,Hyperfine and quadrupole interactions for Dy isotopes in DyPc$_2$ molecules,"Nuclear spin levels play an important role in understanding magnetization
+dynamics and implementation and control of quantum bits in lanthanide-based
+single-molecule magnets. We investigate the hyperfine and nuclear quadrupole
+interactions for $^{161}$Dy and $^{163}$Dy nucleus in anionic DyPc$_2$
+(Pc=phthalocyanine) single-molecule magnets, using multiconfigurational
+ab-initio methods (beyond density-functional theory) including spin-orbit
+interaction. The two isotopes of Dy are chosen because the others have zero
+nuclear spin. Both isotopes have the nuclear spin $I=5/2$, although the
+magnitude and sign of the nuclear magnetic moment differ from each other. The
+large energy gap between the electronic ground and first-excited Kramers
+doublets, allows us to map the microscopic hyperfine and quadrupole interaction
+Hamiltonian onto an effective Hamiltonian with an electronic pseudo-spin
+$S_{\rm eff}=1/2$ that corresponds to the ground Kramers doublet. Our ab-initio
+calculations show that the coupling between the nuclear spin and electronic
+orbital angular momentum contributes the most to the hyperfine interaction and
+that both the hyperfine and nuclear quadrupole interactions for $^{161}$Dy and
+$^{163}$Dy nucleus are much smaller than those for $^{159}$Tb nucleus in
+TbPc$_2$ single-molecule magnets. The calculated separations of the
+electronic-nuclear levels are comparable to experimental data reported for
+$^{163}$DyPc$_2$. We demonstrate that hyperfine interaction for Dy Kramers ion
+leads to tunnel splitting (or quantum tunneling of magnetization) at zero
+field. This effect does not occur for TbPc$_2$ single-molecule magnets. The
+magnetic field values of the avoided level crossings for $^{161}$DyPc$_2$ and
+$^{163}$DyPc$_2$ are found to be noticeably different, which can be observed
+from experiment.",2002.05134v1
+2018-03-08,Persistent spin texture enforced by symmetry,"Persistent spin texture (PST) is the property of some materials to maintain a
+uniform spin configuration in the momentum space. This property has been
+predicted to support an extraordinarily long spin lifetime of carriers
+promising for spintronics applications. The PST is known to emerge when the
+strengths of two dominant spin-orbit couplings, the Rashba and linear
+Dresselhaus, are equal. This condition, however, is not trivial to achieve and
+requires tuning the Rashba and Dresselhaus parameters, as has been demonstrated
+with semiconductor quantum-well structures. Here we predict that there exist a
+class of non-centrosymmetric bulk materials where the PST is enforced by the
+non-symmorphic space group symmetry of the crystal. Around certain high
+symmetry points in the Brillouin zone, the sublattice degrees of freedom impose
+a constraint on the effective spin-orbit field, which remains independent of
+the momentum orientation and thus maintains the PST. We illustrate this
+behavior using density-functional theory calculations for a handful of
+promising candidates accessible experimentally. Among them is the ferroelectric
+oxide BiInO3-a wide band gap semiconductor which sustains a PST around the
+conduction band minimum. Our results broaden the range of materials, which can
+be employed in spintronics.",1803.02964v2
+2018-08-22,Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon,"Spin-orbit coupling is relatively weak for electrons in bulk silicon, but
+enhanced interactions are reported in nanostructures such as the quantum dots
+used for spin qubits. These interactions have been attributed to various
+dissimilar interface effects, including disorder or broken crystal symmetries.
+In this Letter, we use a double-quantum-dot qubit to probe these interactions
+by comparing the spins of separated singlet-triplet electron pairs. We observe
+both intravalley and intervalley mechanisms, each dominant for [110] and [100]
+magnetic field orientations, respectively, that are consistent with a broken
+crystal symmetry model. We also observe a third spin-flip mechanism caused by
+tunneling between the quantum dots. This improved understanding is important
+for qubit uniformity, spin control and decoherence, and two-qubit gates.",1808.07378v2
+2019-02-27,Symmetry-assisted protection and compensation of hidden spin polarization in centrosymmetric systems,"It is recently noted that in certain centrosymmetric compounds, spin-orbit
+interaction couples each local sector that lacks inversion symmetry and thus
+leads to visible spin polarization effects in the real space, dubbed as 'hidden
+spin polarization (HSP)'. However, observable spin polarization of a given
+local sector suffers interference by its inversion partner, impeding material
+realization and potential applications of HSP. Starting from a single-orbital
+tight-binding model, we propose a nontrivial way to protect strong
+sector-projected spin texture through minimizing the interaction between
+inversion partners by nonsymmorphic symmetry. The HSP effect is generally
+compensated by inversion partners near the {\Gamma} point but immune from
+interaction around the boundary of the Brillouin zone. We further summarize 17
+layer groups that support such symmetry-assisted HSP and identify by
+first-principle calculations hundreds of quasi-2D materials from the existing
+databases, among which a group of rare-earth compounds LnOI (Ln = Pr, Nd, Ho,
+Tm and Lu) serves as great candidates showing strong Rashba- and
+Dresselhaus-type HSP. Our finding also provides an ideal platform to control
+HSP for emergent physical effects, such as opening a hybridization gap by
+tensile strain to realize the time-reversal-invariant topological
+superconductivity.",1902.10277v1
+2019-03-19,Kitaev quantum spin liquid - concept and materialization,"A decade ago, Alexei Kitaev proposed an exactly solvable $S$ = 1/2 model on a
+two-dimensional honeycomb lattice, where the spins fractionalize into Majorana
+fermions and form a topological quantum spin liquid (QSL) in the ground state.
+It was soon recognized that a family of complex iridium oxides, as well as
+ruthenium chloride, with honeycomb structure are magnetic insulators and
+accommodate essential ingredients of the Kitaev model, due to the interplay of
+electron correlation and spin-orbit coupling. This initiated a race to
+materialize the Kitaev QSL and to capture the signature of Majorana fermions.
+In this review, we provide a wide perspective of this rapidly growing field,
+including theory, materials and experiment. We first summarize the theoretical
+background of the Kitaev QSL ground state and its materialization using
+spin-orbital-entangled $J_{\rm eff}$ = 1/2 moments. This is followed by an
+overview of candidate materials and their magnetic properties, including
+Na$_2$IrO$_3$, $\alpha$, $\beta$, $\gamma$-Li$_2$IrO$_3$,$\alpha$-RuCl$_3$ and
+H$_3$LiIr$_2$O$_6$. Finally, we review the latest exciting progress in the
+search for the Kitaev QSL. In particular, H$_3$LiIr$_2$O$_6$ and
+$\alpha$-RuCl$_3$ in applied magnetic field show signatures of the QSL state,
+and $\alpha$-RuCl$_3$ has unusual magnetic excitations and thermal transport
+properties that are consistent with spin fractionalization.",1903.08081v1
+2020-05-07,Effect of interfacial oxidation layer in spin pumping experiments on Ni$_{80}$Fe$_{20}$/SrIrO$_3$ heterostructures,"SrIrO$_3$ with its large spin-orbit coupling and low charge conductivity has
+emerged as a potential candidate for efficient spin-orbit torque magnetization
+control in spintronic devices. We here report on the influence of an
+interfacial oxide layer on spin pumping experiments in Ni$_{80}$Fe$_{20}$
+(NiFe)/SrIrO$_3$ bilayer heterostructures. To investigate this scenario we have
+carried out broadband ferromagnetic resonance (BBFMR) measurements, which
+indicate the presence of an interfacial antiferromagnetic oxide layer. We
+performed in-plane BBFMR experiments at cryogenic temperatures, which allowed
+us to simultaneously study dynamic spin pumping properties (Gilbert damping)
+and static magnetic properties (such as the effective magnetization and
+magnetic anisotropy). The results for NiFe/SrIrO$_3$ bilayer thin films were
+analyzed and compared to those from a NiFe/NbN/SrIrO$_3$ trilayer reference
+sample, where a spin-transparent, ultra-thin NbN layer was inserted to prevent
+oxidation of NiFe. At low temperatures, we observe substantial differences in
+the magnetization dynamics parameters of these samples, which can be explained
+by an antiferromagnetic interfacial layer in the NiFe/SrIrO$_3$ bilayers.",2005.03727v1
+2020-10-17,Time-Energy Uncertainty Limit for spin-related wavepacket evolution,"In this report we study the quantum transport of charge carriers for low
+dimensional systems with spin-orbit coupling by means of Heisenberg's
+inequalities. To develop our analysis, an accurate \emph{gendanken} experiment
+was carefully put together, mainly based on the spin-field effect transistor
+phenomenology and taking into account several wide accepted approaches on
+quantum mechanical limited determinism. While verifying the applicability of
+time-energy uncertainty relation (TEUR) during electronic wavepacket's
+evolution through a semiconductor quantum wire, some qualitative information
+related the dynamic behavior of the system is found. The problem is also
+approached in the framework of the stationary phase method to guarantee robust
+coherence for wavepacket's evolution, which lately implies certain restrictions
+on the incident energy values for the envisioned cases. Tailoring different
+input parameters such as: incoming particles spin polarization, barrier
+thickness and Rashba's spin-orbit interaction (R-SOI) strength, we have
+observed appealing effects while the packet evolves through a quasi-1D
+heterostructure. Hopefully some of them could be of help in spintronics device
+designing. We have obtained most of the numerical simulation results, within
+the so-called conservation zone. However, for certain barrier thicknesses, some
+values drop into the forbidden area regarding the clear theoretical limit
+imposed by the TEUR. As an expected bonus throughout our theoretical validation
+of the TEUR, spin splitting due to finite values of R-SOI was nicely noticed.",2010.08803v3
+2017-07-16,First Principles Study of the Giant Magnetic Anisotropy Energy in Bulk Na4IrO4,"In 5d transition metal oxides, novel properties arise from the interplay of
+electron correlations and spin--orbit interactions. Na4IrO4, where 5d
+transition-metal Ir atom occupies the center of the square-planar coordination
+environment, is synthesized. Based on density functional theory, we calculate
+its electronic and magnetic properties. Our numerical results show that the
+Ir-5d bands are quite narrow, and the bands around the Fermi level are mainly
+contributed by d_{xy},d_{yz} and d_{zx} orbitals. The magnetic easy-axis is
+perpendicular to the IrO4 plane, and the magnetic anisotropy energy (MAE) of
+Na4IrO4 is found to be very giant. We estimate the magnetic parameters by
+mapping the calculated total energy for different spin configurations onto a
+spin model. The next nearest neighbor exchange interaction J2 is much larger
+than other intersite exchange interactions and results in the magnetic ground
+state configuration. Our study clearly demonstrates that the huge MAE comes
+from the single-ion anisotropy rather than the anisotropic interatomic spin
+exchange. This compound has a large spin gap but very narrow spin-wave
+dispersion, due to the large single-ion anisotropy and relatively small
+exchange couplings. Noticing this remarkable magnetic feature originated from
+its highly isolated IrO4 moiety, we also explore the possiblity to further
+enhance the MAE.",1707.04865v1
+2017-07-28,Helical edge states in silicene and germanene nanorings in perpendicular magnetic field,"Due to nonzero intrinsic spin-orbit interaction in buckled honeycomb crystal
+structures, silicene and germanene exhibit interesting topological properties,
+and are therefore candidates for the realization of the quantum spin Hall
+effect. We employ the Kane-Mele model to investigate the electron states in
+hexagonal silicene and germanene nanorings having either zigzag or armchair
+edges in the presence of a perpendicular magnetic field. We present results for
+the energy spectra as function of magnetic field, the electron density of the
+spin-up and spin-down states in the ring plane, and the calculation of the
+probability current density. The quantum spin Hall phase is found at the edges
+between the nontrivial topological phase in silicene and germanene and vacuum.
+We demonstrate that the helical edge states in zigzag silicene and germanene
+nanorings can be qualitatively well understood by means of classical magnetic
+moments. However, this is not the case for comparable-sized armchair nanorings,
+where the eigenfunctions spread throughout the ring. Finally, we note that the
+energy spectra of silicene and germanene nanorings are similar and that the
+differences between the two are mainly related to the difference in magnitude
+of the spin-orbit coupling.",1707.09179v2
+2022-01-21,Electrical and thermal transport in a twisted heterostructure of transition metal dichalcogenide and CrI$_3$ connected to a superconductor,"The broad tunability of the proximity exchange effect between
+transition-metal dichalcogenides (TMDCs) and chromium iodide (CrI$_3$)
+heterostructures offers intriguing possibilities for the use of TMDCs in
+two-dimensional magnetoelectrics. In this work, the influence of the twist
+angle and the gate electric field on the electric and thermal transport in a
+TMDC/CrI$_3$ junction is investigated using the Dirac -Bogoliubov-de Gennes
+equation. We show that significant amounts can be controlled by spin-splitting
+of band structures due to spin-orbit interaction, and that the
+exchange-splitting of bands arises from the proximity effect. The property of
+the Andreev reflection (AR) process is highly dependent on the spin valley
+polarized states due to spin-orbit coupling. Remarkably, perfect spin valley
+polarized AR is possible over a wide bias range by using a gate voltage to tune
+the local Fermi energy and varying the type of charge doping. The proposed
+structure with $p$-type doping is found to have larger spin valley polarized
+Andreev conductance and high thermal conductance. We further show that,
+depending on the TMDC material and chemical potential of the TMDC/CrI$_3$
+layer, twisting can lead to suppression or a significant increase in Andreev
+conductance as well as enhancement of thermal conductance for chemical
+potentials smaller than that of the superconducting regime.",2201.08573v2
+2022-04-08,Manipulating the transverse spin angular momentum and Belinfante momentum of spin-polarized light by a tilted stratified medium in optical tweezers,"In the recent past, optical tweezers incorporating a stratified medium have
+been exploited to generate complex translational and rotational dynamics in
+mesoscopic particles due to the coupling between the spin and orbital angular
+momentum of the light, generated as a consequence of the tight focusing of
+light by a high numerical aperture objective lens into the stratified medium.
+Here, we consider an optical tweezers system with a tilted stratified medium
+(direction of stratification at an angle with the axis of the incident beam),
+and show that for input circularly polarized Gaussian beams, the resulting
+spin-orbit interaction deeply influences the generation of transverse spin
+angular momentum (TSAM) and Belinfante momentum of light, and allows additional
+control on their magnitude. Importantly, the TSAM generated in our system
+consists of both the orthogonal components, which is in sharp contrast to the
+case of evanescent waves and surface plasmons, where only one of the TSAM
+components are generated. The broken symmetry due to the tilt ensures that,
+depending upon the helicity of the input beam, the magnitude of the mutually
+orthogonal components of the TSAM depend entirely on the tilt angle. This may
+prove to be an effective handle in exotic spin-controlled manipulation of
+particles in experiments.",2204.04316v2
+2022-12-22,"Explicit derivation of the chiral and (generic) helical edge states for the Kane-Mele model: Closed expressions for the wave function, dispersion relation, and spin rotation","While one of the most important and intriguing features of the topological
+insulators is the presence of edge states, the closed-form expressions for the
+edge states of some famous topological models are still lacking. Here, we focus
+on the Kane-Mele model with and without Rashba spin-orbit coupling as a
+well-known model to describe a two-dimensional version of the $\mathbb{Z}_2$
+topological insulator to study the properties of its edge states analytically.
+By considering the tight-binding model on a honeycomb lattice with zigzag
+boundaries and introducing a perturbative approach, we derive explicit
+expressions for the wave functions, energy dispersion relations, and the spin
+rotations of the (generic) helical edge states. To this end, we first map the
+edge states of the ribbon geometry into an effective two-leg ladder model with
+momentum-dependent energy parameters. Then, we split the Hamiltonian of the
+system into an unperturbed part and a perturbation. The unperturbed part has a
+flat-band energy spectrum and can be solved exactly which allows us to consider
+the remaining part of the Hamiltonian perturbatively. The resulting energy
+dispersion relation within the first-order perturbation, surprisingly, is in
+excellent agreement with the numerical spectra over a very wide range of
+wavenumbers. Our perturbative framework also allows deriving an explicit form
+for the rotation of the spins of the momentum edge states in the absence of
+axial spin symmetry due to the Rashba spin-orbit interaction.",2212.11520v1
+2022-12-29,Every-other-layer Dipolar Excitons in a Spin-Valley locked Superlattice,"Monolayer semiconducting transition metal dichalcogenides possess broken
+inversion symmetry and strong spin-orbit coupling, which leads to unique
+spin-valley locking effect. In 2H stacked pristine multilayers, the spin-valley
+locking yields an electronic superlattice structure, where alternating layers
+correspond to barrier and quantum well respectively, conditioned on the
+spin-valley indices. Here, we show that the spin-valley locked superlattice
+hosts a new kind of dipolar excitons with the electron and hole constituents
+separated in an every-other-layer configuration, i.e., either in two even or
+two odd layers. Such excitons become optically bright via hybridization with
+intralayer excitons, displaying multiple anti-crossing patterns in optical
+reflection spectrum as the dipolar exciton is tuned through the intralayer
+resonance by electric field. The reflectance spectra also reveal an excited
+state orbital of the every-other-layer exciton, pointing to a sizable binding
+energy in the same order of magnitude as the intralayer exciton. As layer
+thickness increases, the dipolar exciton can form one-dimensional Bose-Hubbard
+chain displaying a layer number dependent fine-structures in the reflectance
+spectra. Our work reveals a distinct valleytronic superlattice with highly
+tunable dipolar excitons for exploring light-matter interactions.",2212.14140v1
+2023-01-12,Spin-orbital order and excitons in magnetoresistive HoBi,"The magnetism of the rock-salt $fcc$ rare-earth monopnictide HoBi, a
+candidate topological material with extreme magnetoresistance, is investigated.
+From the Ho$^{3+}$ non-Kramers $J$=8 spin-orbital multiplet, the cubic crystal
+electric field yields six nearly degenerate low-energy levels. These constitute
+an anisotropic magnetic moment with a Jahn-Teller-like coupling to the lattice.
+In the cubic phase for $T>T_N~=~5.72(1)~K$, the paramagnetic neutron scattering
+is centered at $\mathbf{k}=(\frac{1}{2}\frac{1}{2}\frac{1}{2})$ and was fit to
+dominant antiferromagnetic interactions between Ho spins separated by $\{100\}$
+and ferromagnetic interactions between spins displaced by
+$\{\frac{1}{2}\frac{1}{2}0\}$. For $T<T_N$, a type-II AFM long-range order with
+$\mathbf{k}=(\frac{1}{2}\frac{1}{2}\frac{1}{2})$ develops along with a
+tetragonal lattice distortion. While neutron diffraction from a multi-domain
+sample cannot unambiguously determine the spin orientation within a domain, the
+bulk magnetization, structural distortion, and our measurements of the magnetic
+excitations all show the easy axis coincides with the tetragonal axis. The
+weakly dispersive excitons for $T<T_N$ can be accounted for by a spin
+Hamiltonian that includes the crystal electric field and exchange interactions
+within the Random Phase Approximation.",2301.05141v1
+2023-07-21,Magnetic Proximity induced efficient charge-to-spin conversion in large area PtSe$_{2}$/Ni$_{80}$Fe$_{20}$ heterostructures,"As a topological Dirac semimetal with controllable spin-orbit coupling and
+conductivity, PtSe$_2$, a transition-metal dichalcogenide, is a promising
+material for several applications from optoelectric to sensors. However, its
+potential for spintronics applications is yet to be explored. In this work, we
+demonstrate that PtSe$_{2}$/Ni$_{80}$Fe$_{20}$ heterostructure can generate a
+large damping-like current-induced spin-orbit torques (SOT), despite the
+absence of spin-splitting in bulk PtSe$_{2}$. The efficiency of charge-to-spin
+conversion is found to be $(-0.1 \pm 0.02)$~nm$^{-1}$ in
+PtSe$_{2}$/Ni$_{80}$Fe$_{20}$, which is three times that of the control sample,
+Ni$_{80}$Fe$_{20}$/Pt. Our band structure calculations show that the SOT due to
+the PtSe$_2$ arises from an unexpectedly large spin splitting in the
+interfacial region of PtSe$_2$ introduced by the proximity magnetic field of
+the Ni$_{80}$Fe$_{20}$ layer. Our results open up the possibilities of using
+large-area PtSe$_{2}$ for energy-efficient nanoscale devices by utilizing the
+proximity-induced SOT.",2307.11524v1
+2000-04-24,Magnetic Phase Transition of the Perovskite-type Ti Oxides,"Properties and mechanism of the magnetic phase transition of the
+perovskite-type Ti oxides, which is driven by the Ti-O-Ti bond angle
+distortion, are studied theoretically by using the effective spin and
+pseudo-spin Hamiltonian with strong Coulomb repulsion. It is shown that the
+A-type antiferromagnetic(AFM(A)) to ferromagnetic(FM) phase transition occurs
+as the Ti-O-Ti bond angle is decreased. Through this phase transition, the
+orbital state is hardly changed so that the spin-exchange coupling along the
+c-axis changes nearly continuously from positive to negative and takes
+approximately zero at the phase boundary. The resultant strong
+two-dimensionality in the spin coupling causes a rapid suppression of the
+critical temperature as is observed experimentally.",0004389v1
+2004-07-28,Tunneling Anisotropic Magnetoresistance: A spin-valve like tunnel magnetoresistance using a single magnetic layer,"We introduce a new class of spintronics devices in which a spin-valve like
+effect results from strong spin-orbit coupling in a single ferromagnetic layer
+rather than from injection and detection of a spin-polarized current by two
+coupled ferromagnets. The effect is observed in a
+normal-metal/insulator/ferromagnetic-semiconductor tunneling device. This
+behavior is caused by the interplay of the anisotropic density of states in
+(Ga,Mn)As with respect to the magnetization direction, and the two-step
+magnetization reversal process in this material.",0407735v1
+2007-05-04,Two Qubit Entanglement in $XYZ$ Magnetic Chain with DM Antisymmetric Anisotropic Exchange Interaction,"In the present paper we study two qubit entanglement in the most general
+$XYZ$ Heisenberg magnetic chain with (non)homogeneous magnetic fields and the
+DM anisotropic antisymmetric exchange interaction, arising from the spin-orbit
+coupling . The model includes all known results as particular cases, for both
+antiferromagnetic and ferromagnetic $XX, XY, XXX, XXZ, XYZ$ chains. The
+concurrence of two qubit thermal entanglement and its dependence on anisotropic
+parameters, external magnetic field and temperature are studied in details. We
+found that in all cases, inclusion of the DM interaction, which is responsible
+for weak ferromagnetism in mainly antiferromagnetic crystals and spin
+arrangement in low symmetry magnets, creates (when it does not exist) or
+strengthens (when it exists) entanglement in $XYZ$ spin chain. This implies
+existence of a relation between arrangement of spins and entanglement, in which
+the DM coupling plays an essential role. It suggests also that anisotropic
+antisymmetric exchange interaction could be an efficient control parameter of
+entanglement in the general $XYZ$ case.",0705.0679v1
+2009-05-07,Fractional vortex lattice structures in spin triplet superconductors,"Motivated by recent interest in spin triplet superconductors, we investigate
+the vortex lattice structures for this class of unconventional superconductors.
+We discuss how the order parameter symmetry can give rise to U(1)$\times$U(1)
+symmetry in same sense as in spinor condensates, making half-quantum vortices
+(HQV) topologically stable. We then calculate the vortex lattice structure of
+HQV's, with particular attention on the roles of the crystalline lattice, the
+Zeeman coupling, and Meissner screening, all absent in spinor condensates.
+Finally, we consider how spin-orbit coupling leads to a breakdown of the
+U(1)$\times$U(1) symmetry in free energy and whether the HQV lattice survives
+this symmetry breaking. As examples, we examine simpler spin-triplet models
+proposed in the context of NaxCoO2$\cdot$yH2O and Bechgaard salts, as well as
+the better known and more complex model for Sr2RuO4.",0905.1132v2
+2010-02-24,Spin interference and Fano effect in electron transport through a mesoscopic ring side-coupled with a quantum dot,"We investigate the electron transport through a mesoscopic ring side-coupled
+with a quantum dot(QD) in the presence of Rashba spin-orbit(SO) interaction. It
+is shown that both the Fano resonance and the spin interference effects play
+important roles in the electron transport properties. As the QD level is around
+the Fermi energy, the total conductance shows typical Fano resonance line
+shape. By applying an electrical gate voltage to the QD, the total transmission
+through the system can be strongly modulated. By threading the mesoscopic ring
+with a magnetic flux, the time-reversal symmetry of the system is broken, and a
+spin polarized current can be obtained even though the incident current is
+unpolarized.",1002.4455v1
+2010-07-02,"Unconventional superconductivity in weakly correlated, non-centrosymmetric $\rm{Mo_3Al_2C}$","Electrical resistivity, specific heat and NMR measurements classify
+non-centrosymmetric $\rm Mo_3Al_2C$ ($\beta$-Mn type, space group $P4_132$) as
+a strong-coupled superconductor with $T_c = 9$~K deviating notably from
+BCS-like behaviour. The absence of a Hebbel-Slichter peak, a power law
+behaviour of the spin-lattice relaxation rate (from $^{27}$Al NMR), a $T^3$
+temperature dependence of the specific heat and a pressure enhanced $T_c$
+suggest unconventional superconductivity with a nodal structure of the
+superconducting gap. Relativistic DFT calculations reveal a splitting of
+degenerate electronic bands due to the asymmetric spin-orbit coupling,
+favouring a mix of spin-singlet and spin triplet components in the
+superconducting condensate, in absence of strong correlations among electrons.",1007.0420v1
+2012-12-07,Nanomechanical read-out of a single spin,"The spin of a single electron in a suspended carbon nanotube can be read out
+by using its coupling to the nano-mechanical motion of the nanotube. To show
+this, we consider a single electron confined within a quantum dot formed by the
+suspended carbon nanotube. The spin- orbit interaction induces a coupling
+between the spin and one of the bending modes of the suspended part of the
+nanotube. We calculate the response of the system to pulsed external driving of
+the mechanical motion using a Jaynes-Cummings model. To account for resonator
+damping, we solve a quantum master equation, with parameters comparable to
+those used in recent experiments, and show how information of the spin state of
+the system can be acquired by measuring its mechanical motion. The latter can
+be detected by observing the current through a nearby charge detector.",1212.1569v1
+2013-01-24,Topological phase in a two-dimensional metallic heavy-fermion system,"We report on a topological insulating state in a heavy-fermion system away
+from half-filling, which is hidden within a ferromagnetic metallic phase. In
+this phase, the cooperation of the RKKY interaction and the Kondo effect,
+together with the spin-orbit coupling, induces a spin-selective gap, bringing
+about topologically non-trivial properties. This topological phase is robust
+against a change in the chemical potential in a much wider range than the gap
+size. We analyze these remarkable properties by using dynamical mean field
+theory and the numerical renormalization group. Its topological properties
+support a gapless chiral edge mode, which exhibits a non-Tomonaga-Luttinger
+liquid behavior due to the coupling with bulk ferromagnetic spin fluctuations.
+We also propose that the effects of the spin fluctuations on the edge mode can
+be detected via the NMR relaxation time measurement.",1301.5688v2
+2013-02-28,Spin-flip phonon-mediated charge relaxation in double quantum dots,"We theoretically study the $(1,1)$ triplet to $(0,2)$ singlet relaxation rate
+in a lateral gate-defined double quantum dot tuned to the regime of Pauli spin
+blockade. We present a detailed derivation of the effective phonon density of
+states for this specific charge transition, keeping track of the contribution
+from piezoelectric as well as deformation potential electron-phonon coupling.
+We further investigate two different spin-mixing mechanisms which can couple
+the triplet and singlet states: a magnetic field gradient over the double dot
+(relevant at low external magnetic field) and spin-orbit interaction (relevant
+at high field), and we also indicate how the two processes could interfere at
+intermediate magnetic field. Finally, we show how to combine all results and
+evaluate the relaxation rate for realistic system parameters.",1302.7169v1
+2013-10-22,Thermal conductivity of anisotropic spin - 1/2 two leg ladder:Green's function approach,"We study the thermal transport of a spin-1/2 two leg antiferromagnetic ladder
+in the direction of legs. The possible effect of spin-orbit coupling and
+crystalline electric field are investigated in terms of anisotropies in the
+Heisenberg interactions on both leg and rung couplings. The original spin
+ladder is mapped to a bosonic model via a bond-operator transformation where an
+infinite hard-core repulsion is imposed to constrain one boson occupation per
+site. The Green's function approach is applied to obtain the energy spectrum of
+quasi-particle excitations responsible for thermal transport. The thermal
+conductivity is found to be monotonically decreasing with temperature due to
+increased scattering among triplet excitations at higher temperatures. A tiny
+dependence of thermal transport on the anisotropy in the leg direction at low
+temperatures is observed in contrast to the strong one on the anisotropy along
+the rung direction, due to the direct effect of the triplet density. Our
+results reach asymptotically the ballistic regime of the spin - 1/2 Heisenberg
+chain and compare favorably well with exact diagonalization data.",1310.5943v1
+2014-04-07,Spin and impurity effects on flux-periodic oscillations in core-shell nanowires,"We study the quantum mechanical states of electrons situated on a cylindrical
+surface of finite axial length to model a semiconductor core-shell nanowire. We
+calculate the conductance in the presence of a longitudinal magnetic field by
+weakly coupling the cylinder to semi-infinite leads. Spin effects are accounted
+for through Zeeman coupling and Rashba spin-orbit interaction (SOI). Emphasis
+is on manifestations of flux-periodic (FP) oscillations and we show how factors
+such as impurities, contact geometry and spin affect them. Oscillations survive
+and remain periodic in the presence of impurities, noncircular contacts and
+SOI, while Zeeman splitting results in aperiodicity, beating patterns and
+additional background fluctuations. Our results are in qualitative agreement
+with recent magnetotransport experiments performed on GaAs/InAs core-shell
+nanowires. Lastly, we propose methods of data analysis for detecting the
+presence of Rashba SOI in core-shell systems and for estimating the electron
+g-factor in the shell.",1404.1798v2
+2019-09-01,Magnetic field-dependent low-energy magnon dynamics in $α$-RuCl3,"Revealing the spin excitations of complex quantum magnets is key to
+developing a minimal model that explains the underlying magnetic correlations
+in the ground state. We investigate the low-energy magnons in $\alpha$-RuCl$_3$
+by combining time-domain terahertz spectroscopy under an external magnetic
+field and model Hamiltonian calculations. We observe two absorption peaks
+around 2.0 and 2.4 meV, which we attribute to zone-center spin waves. Using
+linear spin-wave theory with only nearest-neighbor terms of the exchange
+couplings, we calculate the antiferromagnetic resonance frequencies and reveal
+their dependence on an external field applied parallel to the nearest-neighbor
+Ru-Ru bonds. We find that the magnon behavior in an applied magnetic field can
+be understood only by including an off-diagonal $\Gamma$ exchange term to the
+minimal Heisenberg-Kitaev model. Such an anisotropic exchange interaction that
+manifests itself as a result of strong spin-orbit coupling can naturally
+account for the observed mixing of the modes at higher fields strengths.",1909.00462v1
+2020-02-14,All-electrical spectroscopy of topological phases in semiconductor-superconductor heterostructures,"Semiconductors in the proximity of superconductors have been proposed to
+support phases hosting Majorana bound states. When the systems undergo a
+topological phase transition towards the Majorana phase, the spectral gap
+closes, then reopens, and the quasiparticle band spin polarization is inverted.
+We focus on two paradigmatic semiconductor-superconductor heterostructures and
+propose an all-electrical spectroscopic probe sensitive to the spin inversion
+at the topological transition. Our proposal relies on the indirect coupling of
+a time-dependent electric field to the electronic spin due to the strong Rashba
+spin-orbit coupling in the semiconductor. We analyze within linear response
+theory the dynamical correlation functions and demonstrate that some components
+of the susceptibility can be used to detect the nontrivial topological phases.",2002.06092v2
+2020-04-17,Superconductivity induced by fluctuations of momentum-based multipoles,"Recent studies of unconventional superconductivity have focused on charge or
+spin fluctuation, instead of electron-phonon coupling, as an origin of
+attractive interaction between electrons. On the other hand, a multipole order,
+which represents electrons' degrees of freedom in strongly correlated and
+spin-orbit-coupled systems, has recently been attracting much attention.
+Stimulated by this background, we investigate multipole-fluctuation-mediated
+superconductivity, which proposes a new pairing mechanism of unconventional
+superconductivity. Indeed, previous works have shown spin-triplet
+superconductivity induced by fluctuations of odd-parity electric multipole
+orders in isotropic systems. In this study, we establish a general formulation
+of the multipole-fluctuation-mediated superconductivity for all multipole
+symmetries, in both isotropic and crystalline systems. As a result, we reveal
+various anisotropic pairings induced by odd-parity and/or higher-order
+multipole fluctuations, which are beyond the ordinary charge or spin
+fluctuations. Topological superconductivity due to the mechanism is also
+discussed. Based on the obtained results, we discuss unconventional
+superconductivity in doped SrTiO$_3$, PrTi$_2$Al$_{20}$, Li$_2$(Pd, Pt)$_3$B,
+and magnetic multipole metals.",2004.08086v3
+2017-09-13,Negative-mass instability of the spin and motion of an atomic gas driven by optical cavity backaction,"We realize a spin-orbit interaction between the collective spin precession
+and center-of-mass motion of a trapped ultracold atomic gas, mediated by spin-
+and position-dependent dispersive coupling to a driven optical cavity. The
+collective spin, precessing near its highest-energy state in an applied
+magnetic field, can be approximated as a negative-mass harmonic oscillator.
+When the Larmor precession and mechanical motion are nearly resonant, cavity
+mediated coupling leads to a negative-mass instability, driving exponential
+growth of a correlated mode of the hybrid system. We observe this growth
+imprinted on modulations of the cavity field and estimate the full covariance
+of the resulting two-mode state by observing its transient decay during
+subsequent free evolution.",1709.04531v2
+2019-02-19,"Spinning extensions of $D(2,1;α)$ superconformal mechanics","As is known, any realization of SU(2) in the phase space of a dynamical
+system can be generalized to accommodate the exceptional supergroup
+$D(2,1;\alpha)$, which is the most general $\mathcal{N}{=}\,4$ supersymmetric
+extension of the conformal group in one spatial dimension. We construct novel
+spinning extensions of $D(2,1;\alpha)$ superconformal mechanics by adjusting
+the SU(2) generators associated with the relativistic spinning particle coupled
+to a spherically symmetric Einstein-Maxwell background. The angular sector of
+the full superconformal system corresponds to the orbital motion of a particle
+coupled to a symmetric Euler top, which represents the spin degrees of freedom.
+This particle moves either on the two-sphere, optionally in the external field
+of a Dirac monopole, or in the SU(2) group manifold. Each case is proven to be
+superintegrable, and explicit solutions are given.",1902.06851v1
+2019-03-01,Anomalous Knight shift and low-energy spin dynamics in the nematic state of FeSe$_{\rm 1-x}$S$_{\rm x}$,"The interplay between the nematic order and magnetism in FeSe is not yet well
+understood. There is a controversy concerning the relationship between orbital
+and spin degrees of freedom in FeSe and their relevance for superconductivity.
+Here we investigate the effect of S substitution on the nematic transition
+temperature ($T_{\rm n}$) and the low-energy spin fluctuations (SF) in FeSe
+single crystals. We show that the low-energy SF emerge below the nematic
+transition. The difference between the onset temperature for the critical SF
+($T_{\rm SF}$) and $T_{\rm n}$ is small for FeSe but significantly increases
+with S substitution. Below $T_{\rm SF}$ the Korringa relation is violated and
+the effective muon hyperfine coupling constant changes a sign. Our results
+exclude a direct coupling of the low-energy SF to the electronic nematic order
+indicating a presence of multiple spin degrees of freedom in FeSe$_{\rm
+1-x}$S$_{\rm x}$.",1903.00530v1
+2019-08-14,Magnetic hedgehog lattices in noncentrosymmetric metals,"The magnetic hedgehog lattice (HL) is a noncoplanar magnetic texture with a
+periodic array of magnetic monopoles and anti-monopoles. Despite
+phenomenological and numerical studies thus far, there remain open issues on
+the microscopic origin, especially with respect to the recent experimental
+findings of two different types of HLs even at zero magnetic field. Here, we
+study the stability of the HLs for an effective spin model with long-range
+interactions arising from itinerant nature of electrons. By variational
+calculations and simulated annealing, we find that the HLs are stabilized in
+the ground state at zero magnetic field by the synergetic effect of the
+anti-symmetric exchange interactions generated by the spin-orbit coupling and
+the multiple-spin interactions generated by the spin-charge coupling. We also
+clarify the phase diagram in the magnetic fields, which includes topological
+phase transitions with pair annihilation of the monopoles and anti-monopoles
+depending on the field directions.",1908.05044v2
+2019-12-25,Approaching the quantum critical point in a highly-correlated all-in-all-out antiferromagnet,"Continuous quantum phase transitions involving all-in-all-out (AIAO)
+antiferromagnetic order in strongly spin-orbit-coupled 5d compounds could give
+rise to various exotic electronic phases and strongly-coupled quantum critical
+phenomena. Here we experimentally trace the AIAO spin order in Sm2Ir2O7 using
+direct resonant x-ray magnetic diffraction techniques under high pressure. The
+magnetic order is suppressed at a critical pressure Pc=6.30 GPa, while the
+lattice symmetry remains in the cubic Fd-3m space group across the quantum
+critical point. Comparing pressure tuning and the chemical series R2Ir2O7
+reveals that the suppression of the AIAO order and the approach to the
+spin-disordered state is characterized by contrasting evolutions of both the
+pyrochlore lattice constant a and the trigonal distortion x. The former affects
+the 5d bandwidth, the latter the Ising anisotropy, and as such we posit that
+the opposite effects of pressure and chemical tuning lead to spin fluctuations
+with different Ising and Heisenberg character in the quantum critical region.
+Finally, the observed low-pressure scale of the AIAO quantum phase transition
+in Sm2Ir2O7 identifies a circumscribed region of P-T space for investigating
+the putative magnetic Weyl-semimetal state.",1912.11640v1
+2020-09-29,Quantum phase transitions in the spin-1 Kitaev-Heisenberg chain,"Recently, it has been proposed that higher-spin analogues of the Kitaev
+interactions $K>0$ may also occur in a number of materials with strong Hund's
+and spin-orbit coupling. In this work, we use Lanczos diagonalization and
+density matrix renormalization group methods to investigate numerically the
+$S=1$ Kitaev-Heisenberg model. The ground-state phase diagram and quantum phase
+transitions are investigated by employing local and nonlocal spin correlations.
+We identified two ordered phases at negative Heisenberg coupling $J<0$:
+a~ferromagnetic phase with $\langle S_i^zS_{i+1}^z\rangle>0$ and an
+intermediate left-left-right-right phase with $\langle
+S_i^xS_{i+1}^x\rangle\neq 0$. A~quantum spin liquid is stable near the Kitaev
+limit, while a topological Haldane phase is found for $J>0$.",2009.14159v1
+2021-03-07,Phonon Hall Viscosity in Magnetic Insulators,"The Phonon Hall Viscosity is the leading term evincing time-reversal symmetry
+breaking in the low energy description of lattice phonons. It may generate
+phonon Berry curvature, and can be observed experimentally through the acoustic
+Faraday effect and thermal Hall transport. We present a systematic procedure to
+obtain the phonon Hall viscosity induced by phonon-magnon interactions in
+magnetic insulators under an external magnetic field. We obtain a general
+symmetry criterion that leads to non-zero Faraday rotation and Hall
+conductivity, and clarify the interplay between lattice symmetry,
+spin-orbit-coupling, external magnetic field and magnetic ordering. The
+symmetry analysis is verified through a microscopic calculation. By
+constructing the general symmetry-allowed effective action that describes the
+spin dynamics and spin-lattice coupling, and then integrating out the spin
+fluctuations, the leading order time-reversal breaking term in the phonon
+effective action, i.e. the phonon Hall viscosity, can be obtained. The analysis
+of the square lattice antiferromagnet for a cuprate Mott insulator,
+Sr$_2$CuO$_2$Cl$_2$, is presented explicitly, and the procedure described here
+can be readily generalized to other magnetic insulators.",2103.04223v1
+2021-07-07,Meron-antimeron crystals in noncentrosymmetric itinerant magnets on a triangular lattice,"Multiple-$Q$ magnetic states often induce nontrivial topological spin
+textures, such as a skyrmion and a hedgehog. We theoretically investigate yet
+another multiple-$Q$ state with topological defects, a meron-antimeron crystal
+(MAX), represented by a periodic array of the meron and antimeron with a
+half-integer skyrmion number. Performing simulated annealing for an effective
+spin model of noncentrosymmetric itinerant magnets on a triangular lattice, we
+show that rectangular-shaped and triangular-shaped MAXs are stabilized by the
+interplay between the biquadratic interaction arising from the spin-charge
+coupling and the Dzyaloshinskii-Moriya interaction arising from the spin-orbit
+coupling. We also discuss the effect of a magnetic field on the triangular MAX,
+where highly anisotropic responses against a field direction are found. In
+particular, we show that the triangular MAX turns into the skyrmion crystal for
+the fields along the $y$ and $z$ directions, while it is replaced by another
+chiral state for the field along the $x$ direction. These results would inspire
+further experimental investigation of the MAXs in itinerant magnets.",2107.03501v1
+2021-10-25,Engineering crystal structure and spin-phonon coupling in Ba1-xSrxMnO3,"The interplay between different degrees of freedom such as charge, spin,
+orbital, and lattice has received a great deal of interest due to its potential
+to engineer materials properties and their functionalities for device
+applications. In this work, we have explored the crystallographic phase diagram
+of Ba1-xSrxMnO3 and studied the correlation between two degrees of freedom,
+namely phonons and spins using magnetization and inelastic light scattering
+measurements. The system undergoes a series of crystallographic phase
+transitions 2H -> 9R -> 4H as a function of doping (Sr) as observed by X-ray
+diffraction measurements. Investigation of their temperature-dependent
+magnetization reveals a para- to antiferro-magnetic transition for all the
+compositions. An Eg phonon in the 9R phase and an E1g phonon in the 4H phase
+involving Mn or O-vibrations, show anomalous temperature-dependence in the
+antiferromagnetic phase arising due to spin-phonon coupling.",2110.12821v1
+2021-12-23,Curvature control of the superconducting proximity effect in diffusive ferromagnetic nanowires,"Coupling a conventional s-wave superconductor to a ferromagnet allows, via
+the proximity effect, to generate superconducting triplet correlations. This
+feature can be employed to achieve a superconducting triplet spin-valve effect
+in superconductor-ferromagnet (SF) hybrid structures, for example by switching
+the magnetizations of the ferromagnets between parallel and antiparallel
+configurations in F1SF2 and SF1F2 trilayers, or in SF bilayers with both Rashba
+and Dresselhaus SOC. It was recently reported that geometric curvature can
+control the generation of long ranged triplets. We use this property to show
+that the superconducting critical temperature of an SF hybrid nanowire can be
+tuned by varying the curvature of the ferromagnetic side alone, with no need of
+another ferromagnet or SOC. We show that the variation of the critical
+temperature as a function of the curvature can be exploited to obtain a robust,
+curvature-controlled, superconducting triplet spin-valve effect. Furthermore,
+we perform an analysis with the inclusion of spin-orbit coupling and explain
+how it modifies the spin-valve effect both quantitatively and qualitatively.",2112.12797v1
+2022-01-31,A method for the variational calculation of hyperfine-resolved rovibronic spectra of diatomic molecules,"An algorithm for the calculation of hyperfine structure and spectra of
+diatomic molecules based on the variational nuclear motion is presented.
+Hyperfine coupling terms considered are Fermi-contact, nuclear spin-electron
+spin dipole-dipole, nuclear spin-orbit, nuclear spin-rotation and nuclear
+electric quadrupole interactions. Initial hyperfine-unresolved wavefunctions
+are obtained for given set of potential energy curves and associated couplings
+by variation solution of the nuclear-motion Schr\""odinger equation. Fully
+hyperfine-resolved parity-conserved rovibronic Hamiltonian matrices for a given
+final angular momentum, $\bm{F}$, are constructed and then diagonalized to give
+hyperfine-resolved energies and wavefunctions.Electric transition dipole moment
+curves can then be used to generate a hyperfine-resolved line list by applying
+rigorous selection rules.The algorithm is implemented in \textsc{Duo}, which is
+a general program for calculating spectra of diatomic molecules. This approach
+is tested for NO and MgH,and the results are compared to experiment and shown
+to be consistent with those given the well-used effective Hamiltonian code
+PGOPHER.",2201.13104v1
+2022-08-22,Ultrafast Spin Dynamics and Photoinduced Insulator-to-Metal Transition in $α$-$RuCl_3$,"Laser-induced ultrafast demagnetization is a phenomenon of utmost interest
+and attracts significant attention because it enables potential applications in
+ultrafast optoelectronics and spintronics. As a spin-orbit coupling assisted
+magnetic insulator, $\alpha$-$RuCl_3$ provides an attractive platform to
+explore the physics of electronic correlations and related unconventional
+magnetism. Using time-dependent density functional theory, we explore the
+ultrafast laser-induced dynamics of the electronic and magnetic structures in
+$\alpha$-$RuCl_3$. Our study unveils that laser pulses can introduce ultrafast
+demagnetizations in $\alpha$-$RuCl_3$, accompanied by an out-of-equilibrium
+insulator-to-metal transition in a few tens of femtoseconds. The spin response
+significantly depends on the laser wavelength and polarization on account of
+the electron correlations, band renormalizations and charge redistributions.
+These findings provide physical insights into the coupling between the
+electronic and magnetic degrees of freedom in $\alpha$-$RuCl_3$ and shed light
+on suppressing the long-range magnetic orders and reaching a proximate spin
+liquid phase for two-dimensional magnets on an ultrafast timescale.",2208.10222v1
+2006-08-03,Persistent spin helix in Rashba-Dresselhaus two-dimensional electron systems,"A persistent spin helix (PSH) in spin-orbit-coupled two-dimensional electron
+systems was recently predicted to exist in two cases: [001] quantum wells (QWs)
+with equal coupling strengths of the Rashba and the Dresselhaus interactions
+(RD), and Dresselhaus-only [110] QWs. Here we present supporting results and
+further investigations, using our previous results [Phys. Rev. B 72, 153305
+(2005)]. Refined PSH patterns for both RD [001] and Dresselhaus [110] QWs are
+shown, such that the feature of the helix is clearly seen. We also discuss the
+time dependence of spin to reexamine the origin of the predicted persistence of
+the PSH. For the RD [001] case, we further take into account the random Rashba
+effect, which is much more realistic than the constant Rashba model. The
+distorted PSH pattern thus obtained suggests that such a PSH may be more
+observable in the Dresselhaus [110] QWs, if the dopants cannot be regularly
+enough distributed.",0608077v2
+2007-12-29,Four-Step Evolution of Spin-Hall Conductance: Tight-Binding Electrons with Rashba Coupling in a Magnetic Field,"An intriguing magneto-transport property is demonstrated by tight-binding
+lattice electrons with Rashba spin-orbit coupling (SOC) in a magnetic field.
+With the flux strength $\phi={2\pi/N}$ ($N$ is an integer) and the Zeeman
+splitting fixed, when increasing the Rashba SOC $\lambda$, the spin-Hall and
+charge-Hall conductances (SHC and CHC) undergo four-step evolutions: the SHC
+shows size-dependent resonances and jumps at three critical $\lambda_{c}$'s,
+and changes its sign at $\lambda_{c1}$ and $\lambda_{c3}$; while the CHC
+exhibits three quantum jumps by $-Ne^2/h$, $+2Ne^2/h$ and $-Ne^2/h$. Such
+four-step evolutions are also reflected in topological characters and spin
+polarizations of edge states of a cylindrical system, and are robust against
+weak disorder.",0801.0035v1
+2009-09-23,Decoherence of spin qubits due to a nearby charge fluctuator in gate-defined double dots,"The effects of a nearby two-level charge fluctuator on a double-dot two-spin
+qubit are studied theoretically. Assuming no direct tunneling between the
+charge fluctuator and the qubit quantum dots, the Coulomb couplings between the
+qubit orbital states and the fluctuator are calculated within the Hund-Mulliken
+framework to quadrupole-quadrupole order in a multipole expansion. We identify
+and quantify the coupling term that entangles the qubit to the fluctuator and
+analyze qubit decoherence effects that result from the decay of the fluctuator
+to its reservoir. Our results show that the charge environment can severely
+impact the performance of spin qubits, and indicate working points at which
+this decoherence channel is minimized. Our analysis also suggests that an
+ancillary double-dot can provide a convenient point for single-qubit operations
+and idle position, adding flexibility in the quantum control of the two-spin
+qubit.",0909.4116v1
+2010-03-04,Generic nodeless Larkin Ovchinnikov states due to singlet-triplet mixing,"Larkin-Ovchinnikov (LO) states typically have a singlet-gap that vanishes
+along real-space lines. These real-space nodes lead to Andreev midgap states
+which can serve as a signature of LO pairing. We show that at these nodes, an
+odd-parity, spin-triplet component is always induced, leading to a nodeless LO
+phase. We find the two-dimensional weak coupling, clean limit s-wave phase
+diagram when this spin-triplet part is included. The triplet component is large
+and increases the stability of the FFLO phase. We also show that the
+spin-triplet contribution pushes the midgap states away from zero energy.
+Finally, we show how our results can be explained phenomenologically though
+Lifshitz invariants. These invariants provide a simple approach to understand
+the role of unconventional pairing states, spin-orbit coupling, and
+inhomogeneous mixed singlet-triplet states that are not due to a FFLO
+instability. We discuss our results in the context of organic superconductors.",1003.1152v1
+2010-07-27,Magnetic Response in Quantized Spin Hall Phase of Correlated Electrons,"We investigate the magnetic response in the quantized spin Hall (SH) phase of
+layered-honeycomb lattice system with intrinsic spin-orbit coupling lambda_SO
+and on-site Hubbard U. The response is characterized by a parameter g= 4 U a^2
+d / 3, where a and d are the lattice constant and interlayer distance,
+respectively. When g< (sigma_{xy}^{s2} mu)^{-1}, where sigma_{xy}^{s} is the
+quantized spin Hall conductivity and mu is the magnetic permeability, the
+magnetic field inside the sample oscillates spatially. The oscillation vanishes
+in the non-interacting limit U -> 0. When g > (sigma_{xy}^{s2} mu)^{-1}, the
+system shows perfect diamagnetism, i.e., the Meissner effect occurs. We find
+that superlattice structure with large lattice constant is favorable to see
+these phenomena. We also point out that, as a result of Zeeman coupling, the
+topologically-protected helical edge states shows weak diamagnetism which is
+independent of the parameter g.",1007.4671v3
+2012-10-04,Relativistic new Yukawa-like potential and tensor coupling,"We approximately solve the Dirac equation for a new suggested generalized
+inversely quadratic Yukawa (GIQY) potential including a Coulomb-like tensor
+interaction with arbitrary spin-orbit coupling quantum number In the framework
+of the spin and pseudospin (p-spin) symmetry, we obtain the energy eigenvalue
+equation and the corresponding eigenfunctions, in closed form, by using the
+parametric Nikiforov-Uvarov (NU) method. The numerical results show that the
+Coulomb-like tensor interaction, removes degeneracies between spin and p-spin
+state doublets. The Dirac solutions in the presence of exact spin symmetry are
+reduced to Schr\""odinger solutions for Yukawa and inversely quadratic Yukawa
+potentials.",1210.1406v1
+2014-12-13,On the Role of a Torsion-like Field in a Scenario for the Spin Hall Effect,"Starting from an action that describes a Dirac fermion, we propose and
+analyze a model based on a low-relativistic Pauli equation coupled to a
+torsion-like term to study Spin Hall Effect (SHE). We point out a very
+particular connection between the modified Pauli equation and the (SHE), where
+what we refer to torsion as field playing an important r\^ole in the spin-orbit
+coupling process. In this scenario, we present a proposal of a spin-type
+current, considering the tiny contributions of torsion in connection with
+geometrical properties of the material.",1412.4272v2
+2017-02-16,Anomalous Nonlocal Resistance and Spin-charge Conversion Mechanisms in Two-Dimensional Metals,"We uncover two anomalous features in the nonlocal transport behavior of
+two-dimensional metallic materials with spin-orbit coupling. Firstly, the
+nonlocal resistance can have negative values and oscillate with distance, even
+in the absence of a magnetic field. Secondly, the oscillations of the nonlocal
+resistance under an applied in-plane magnetic field (Hanle effect) can be
+asymmetric under field reversal. Both features are produced by direct
+magnetoelectric coupling, which is possible in materials with broken inversion
+symmetry but was not included in previous spin diffusion theories of nonlocal
+transport. These effects can be used to identify the relative contributions of
+different spin-charge conversion mechanisms. They should be observable in
+adatom-functionalized graphene, and may provide the reason for discrepancies in
+recent nonlocal transport experiments on graphene.",1702.04955v3
+2019-07-09,"Large, tunable valley splitting and single-spin relaxation mechanisms in a Si/Si$_x$Ge$_{1-x}$ quantum dot","Valley splitting is a key figure of silicon-based spin qubits. Quantum dots
+in Si/SiGe heterostructures reportedly suffer from a relatively low valley
+splitting, limiting the operation temperature and the scalability of such qubit
+devices. Here, we demonstrate a robust and large valley splitting exceeding 200
+$\mu$eV in a gate-defined single quantum dot, hosted in molecular-beam
+epitaxy-grown $^{28}$Si/SiGe. The valley splitting is monotonically and
+reproducibly tunable up to 15 % by gate voltages, originating from a 6 nm
+lateral displacement of the quantum dot. We observe static spin relaxation
+times $T_1>1$ s at low magnetic fields in our device containing an integrated
+nanomagnet. At higher magnetic fields, $T_1$ is limited by the valley hotspot
+and by phonon noise coupling to intrinsic and artificial spin-orbit coupling,
+including phonon bottlenecking.",1907.04146v2
+2019-10-01,Nickelate superconductors $--$ Multiorbital nature and spin freezing,"Superconductivity with a remarkably high $T_c$ has recently been found in
+Sr-doped NdNiO$_2$ thin films. While this system bears strong similarities to
+the cuprates, some differences, such as a weaker antiferromagnetic exchange
+coupling and possible high-spin moments on the doped Ni sites have been pointed
+out. Here, we investigate the effect of Hund coupling and crystal field
+splitting in a simple model system and argue that a multiorbital description of
+nickelate superconductors is warranted, especially in the strongly hole-doped
+regime. We then look at this system from the viewpoint of the spin-freezing
+theory of unconventional superconductivity, which provides a unified
+understanding of unconventional superconductivity in a broad range of
+compounds. Sr$_{0.2}$Nd$_{0.8}$NiO$_2$ falls into a parameter regime influenced
+by two spin-freezing crossovers, one related to the emergent multi-orbital
+nature in the strongly doped regime and the other related to the single-band
+character and square lattice geometry in the weakly doped regime.",1910.00473v1
+2020-03-13,The remarkable accuracy of an $O(N^6)$ perturbative correction to opposite-spin CCSD: are triples necessary for chemical accuracy in coupled cluster?,"The focus of this work is OS-CCSD-SPT(2), which is a second-order similarity
+transformed perturbation theory correction to opposite spin coupled cluster
+singles doubles, where in the latter the same-spin amplitudes are removed and
+the opposite-spin ones are solved self consistently. We demonstrate that, for
+non-multireference molecules, OS-CCSD-SPT(2) produces relative energies that
+rival the accuracy of higher-order methods like CCSD(T). For example, using
+PBE0 orbitals in the reference, OS-CCSD-SPT(2) exhibits a mean absolute
+deviation (MAD) of 0.66 kcal/mol with respect to CCSD(2) benchmark values for
+the non-multireference subset of W4-08 atomization energies (c.f. a MAD > 6
+kcal/mol for CCSD). OS-CCSD-SPT(2) is free of empirical parameters, has an
+instrinsic scaling of $O(N^6)$, and makes no use of triples. It is also
+naturally amenable to higher order corrections: the associated third-order
+correction, OS-CCSD-SPT(3), which does involve connected triples and
+quadruples, exhibits a MAD of 0.44 kcal/mol for the same benchmark.",2003.06088v1
+2021-07-06,Constructive Quantum Interference in a Photo-Chemical Reaction of $^{87}$Rb Bose Einstein Condensate,"Interferences emerge when multiple pathways coexist together leading towards
+the same result. A Recent study by Blasing and coworkers [PRL 121(7):073202]
+showed that in a photo-association reaction of Raman dressed spin orbit coupled
+$^{87}$Rb Bose Einstein Condensate when the reactant spin state is prepared in
+a coherent superposition of multiple bare spin states it leads to a destructive
+interference between reaction pathways. Here we report a theoretical study for
+a reaction scheme which leads to constructive quantum interference. This is
+achieved by changing the reactive scattering channel in the reaction. As the
+origin of coherent control comes from the spin part of the wavefunction it is
+sufficient to use radio frequency coupling to achieve the superposition state.
+Our results show that interferences can be used as a resource for the coherent
+control of photo-chemical reactions. The approach is general and can be
+employed to study a wide spectra of chemical reactions in the ultracold regime.",2107.05441v1
+2022-01-28,Electron spin spectroscopy of single TEMPO dimers coupled via interfering tunneling currents,"We report the detection of electron spin resonance (ESR) in individual dimers
+of the stable free radical 2,2,6,6-tetramethyl-piperidine-1-oxyl (TEMPO). ESR
+is measured by the current fluctuations in a scanning tunnelling microscope
+(ESR-STM method). The multi-peak power spectra, distinct from macroscopic data,
+are assigned to dimers having exchange and Dzyaloshinskii-Moriya interactions
+in presence of spin-orbit coupling. These interactions are generated in our
+model by interfering electronic tunneling pathways from tip to sample via the
+dimer's two molecules. This is the first demonstration that tunneling via two
+spins is a valid mechanism of the ESR-STM method.",2201.12154v1
+2023-04-01,Magnetic proximity effect at the interface of two-dimensional materials and magnetic oxide insulators,"Two-dimensional (2D) materials provide a platform for developing novel
+spintronic devices and circuits for low-power electronics. In particular,
+inducing magnetism and injecting spins in graphene have promised the emerging
+field of graphene spintronics. This review focuses on the magnetic proximity
+effect at the interface of 2D materials and magnetic oxide insulators. We
+highlight the unique spin-related phenomena arising from magnetic exchange
+interaction and spin-orbital coupling in 2D materials coupled with magnetic
+oxides. We also describe the fabrication of multifunctional hybrid devices
+based on spin transport. We conclude with a perspective of the field and
+highlight challenges for the design and fabrication of 2D spintronic devices
+and their potential applications in information storage and logic devices.",2304.00356v1
+2024-04-01,"Harnessing Interlayer Magnetic Coupling for Efficient, Field-Free Current-Induced Magnetization Switching in a Magnetic Insulator","Owing to the unique features of low Gilbert damping, long spin-diffusion
+lengths and zero Ohmic losses, magnetic insulators are promising candidate
+materials for next-generation spintronic applications. However, due to the
+localized magnetic moments and the complex metal-oxide interface between
+magnetic insulators and heavy metals, spin-functional Dzyaloshinskii-Moriya
+interactions or spin Hall and Edelstein effects are weak, which diminishes the
+performance of these typical building blocks for spintronic devices. Here, we
+exploit the exchange coupling between metallic and insulating magnets for
+efficient electrical manipulation of heavy metal/magnetic insulator
+heterostructures. By inserting a thin Co layer, we enhance the spin-orbit
+torque efficiency by more than 20 times, which significantly reduces the
+switching current density. Moreover, we demonstrate field-free current-induced
+magnetization switching caused by a symmetry-breaking non-collinear magnetic
+texture. Our work launches magnetic insulators as an alternative platform for
+low-power spintronic devices.",2404.00845v1
+2018-12-28,Strong-coupling formula for momentum-dependent susceptibilities in dynamical mean-field theory,"Computing momentum-dependent susceptibilities in the dynamical mean-field
+theory (DMFT) requires solving the Bethe-Salpeter equation, which demands large
+computational cost. Exploiting the strong-coupling feature of local
+fluctuations, we derive a simplified formula that can be solved at a
+considerably lower cost. The validity and the physical meaning of the formula
+are confirmed by deriving the effective intersite interactions in the
+strong-coupling limit, such as the kinetic exchange and RKKY interactions.
+Furthermore, numerical calculations for single-orbital and multiorbital models
+demonstrate surprisingly wider applicability including weak-coupling region.
+Based on this formula, we propose three levels of practical approximations that
+can be chosen depending on complexity of problems. Simpler evaluations of spin
+and orbital susceptibilities in multiorbital systems thus become possible
+within DMFT.",1812.10918v2
+2023-06-25,A first-principles investigation of the origin of superconductivity in TlBi$_2$,"The intermetallic compound TlBi$_2$ crystallizes in the MgB$_2$ structure and
+becomes superconducting below 6.2 K. Considering that both Tl and Bi have heavy
+atomic masses, it is puzzling why TlBi$_2$ is a conventional phonon-mediated
+superconductor. We have performed comprehensive first-principles calculations
+of the electronic structures, the phonon dispersions and the electron-phonon
+couplings for TlBi$_2$. The $6p$ orbitals of bismuth dominate over the states
+near the Fermi level, forming strong intra-layer $p_{x/y}$ and inter-layer
+$p_z$ $\sigma$ bonds which is known to have strong electron-phonon coupling. In
+addition, the large spin-orbit coupling interaction in TlBi$_2$ increases its
+electron-phonon coupling constant significantly. As a result, TlBi$_2$, with a
+logarithmic phonon frequency average one tenth that of MgB$_2$, is a
+phonon-mediated superconductor.",2306.14365v1
+2003-10-09,Quantum Phase Transitions in the One-Dimensional S=1 Spin-Orbital Model: Implications for Cubic Vanadates,"We investigate ground-state properties and quantum phase transitions in the
+one-dimensional S=1 spin-orbital model relevant to cubic vanadates. Using the
+density matrix renormalization group, we compute the ground-state energy, the
+magnetization and the correlation functions for different values of the Hund's
+coupling $J_H$ and the external magnetic field. It is found that the
+magnetization jumps at a certain critical field, which is a hallmark of the
+field-induced first-order phase transition. The phase transition driven by
+$J_H$ is also of first order. We also consider how the lattice-induced
+ferro-type interaction between orbitals modifies the phase diagram, and discuss
+the results in a context of the first-order phase transition observed in
+YVO$_3$ at 77K.",0310223v1
+2003-12-05,"TiOCl, an orbital-ordered system?","We present first principles density functional calculations and downfolding
+studies of the electronic and magnetic properties of the layered quantum spin
+system
+  TiOCl. We discuss explicitely the nature of the exchange pathes and attempt
+to clarify the concept of orbital ordering in this material. An analysis of the
+electronic structure of slightly distorted structures according to the phononic
+modes allowed in this material suggests that this system is subject to large
+orbital fluctuations driven by the electron-phonon coupling. Based on these
+results, we propose a microscopic explanation of the behavior of TiOCl near the
+phase transition to a spin-gapped system.",0312156v2
+2004-04-21,"Magnetic and orbital ordering of RuO2 planes in RuSr2(Eu,Gd)Cu2O8","We start from an effective Hamiltonian for Ru ions in a square lattice, which
+includes the on-site interactions between t_2g orbitals derived from Coulomb
+repulsion, and a tetragonal crystal-field splitting. Using perturbation theory
+in the hopping terms, we derive effective Hamiltonians to describe the RuO2
+planes of RuSr2(Eu,Gd)Cu2O8. For undoped planes (formal valence Ru{+5}),
+depending on the parameters we find three possible orderings of spin and
+orbitals, and construct a phase diagram. This allows to put constraints on the
+parameters based on experimental data. When electron doping consistent with the
+hole doping of the superconducting RuO2 planes is included, we obtain (for
+reasonable parameters) a double-exchange model with infinite antiferromagnetic
+coupling between itinerant electrons and localized spins. This model is
+equivalent to one used before [H. Aliaga and A. A. Aligia, Physica B 320, 34
+(2002)] which consistently explains the seemingly contradictory magnetic
+properties of RuSr2(Eu,Gd)Cu2O8.",0404506v1
+2004-07-20,The magnetic structure of the Jahn-Teller System LaTiO3,"We investigate the effect of the experimentally observed Jahn-Teller
+distortion of the oxygen octahedra in LaTiO3 on the magnetic exchange. We
+present a localized model for the effective hopping between nearest-neighbor Ti
+ions and the intra-site Coulomb interactions, based on a non-degenerate orbital
+ground state due to the static crystal field. The latter corresponds to an
+orbital order which recently has been confirmed experimentally. Using
+perturbation theory we calculate, in addition to the Heisenberg coupling,
+antisymmetric and symmetric anisotropy terms of the superexchange spin
+Hamiltonian which are caused by the spin-orbit interaction. Employing our
+superexchange Hamiltonian, we deduce the magnetic order at low temperatures
+which is found to be in good agreement with experiment.",0407524v2
+2005-02-04,Effective Interaction between the inter-penetrating Kagome lattices in Na_xCoO_2,"A multi-orbital model for a CoO_2-layer in Na_xCoO_2 is derived. In this
+model the kinetic energy for the degenerate t_2g-orbitals is given by indirect
+hopping over oxygen, leading naturally to the concept of four inter-penetrating
+Kagome lattices. Local Coulomb interaction couples the four lattices and an
+effective Hamiltonian for the interaction in the top band can be written in
+terms of fermionic operators with four different flavors. Focusing on charge
+and spin density instabilities, a big variety of possible metallic states with
+spontaneously broken symmetry are found. These states lead to different charge,
+orbital, spin and angular momentum ordering patterns. The strong superstructure
+formation at x=0.5 is also discussed within this model.",0502116v1
+2006-02-13,Giant Anisotropic Magneto-Resistance in ferromagnetic atomic contacts,"Magneto-resistance is a physical effect of great fundamental and industrial
+interest since it is the basis for the magnetic field sensors used in computer
+read-heads and Magnetic Random Access Memories. As device dimensions are
+reduced, some important physical length scales for magnetism and electrical
+transport will soon be attained. Ultimately, there is a strong need to know if
+the physical phenomena responsible for magneto-resistance still hold at the
+atomic scale. Here, we show that the anisotropy of magneto-resistance is
+greatly enhanced in atomic size constrictions. We explain this physical effect
+by a change in the electronic density of states in the junction when the
+magnetization is rotated, as supported by our ab-initio calculations. This
+stems from the ""spin-orbit coupling"" mechanism linking the shape of the
+orbitals with the spin direction. This sensitively affects the conductance of
+atomic contacts which is determined by the overlap of the valence orbitals.",0602298v1
+2007-10-16,Interaction and thermodynamics of spinons in the XX chain,"The mapping between the fermion and spinon compositions of eigenstates in the
+one-dimensional spin-1/2 XX model on a lattice with N sites is used to describe
+the spinon interaction from two different perspectives: (i) For finite N the
+energy of all eigenstates is expressed as a function of spinon momenta and
+spinon spins, which, in turn, are solutions of a set of Bethe ansatz equations.
+The latter are the basis of an exact thermodynamic analysis in the spinon
+representation of the XX model. (ii) For N -> infinity the energy per site of
+spinon configurations involving any number of spinon orbitals is expressed as a
+function of reduced variables representing momentum, filling, and magnetization
+of each orbital. The spins of spinons in a single orbital are found to be
+coupled in a manner well described by an Ising-like equivalent-neighbor
+interaction, switching from ferromagnetic to antiferromagnetic as the filling
+exceeds a critical level. Comparisons are made with results for the
+Haldane-Shastry model.",0710.3097v1
+2008-09-03,Interaction of a CO molecule with a Pt monoatomic chain: the top geometry,"Recent experiments showed that the conductance of Pt nanocontacts and
+nanowires is measurably reduced by adsorption of CO. We present DFT
+calculations of the electronic structure and ballistic conductance of a Pt
+monoatomic chain and a CO molecule adsorbed in an on-top position. We find that
+the main electronic molecule-chain interaction occurs via the $5\sigma$ and
+$2\pi^{\star}$ orbitals of the molecule, involved in a donation/back-donation
+process similar to that of CO on transition-metal surfaces. The ideal ballistic
+conductance of the monoatomic chain undergoes a moderate reduction by about 1.0
+G_0 (from 4 G_0 to 3.1 G_0) upon adsorption of CO. By repeating all
+calculations with and without spin-orbit coupling, no substantial spin-orbit
+induced change emerges either in the chain-molecule interaction mechanism or in
+the conductance.",0809.0630v1
+2008-10-10,Orbital-limiting and modulation induced by missing parity in non-centrosymmetric superconductors,"We examine the depairing field $H_{c2}(T)$ of non-centrosymmetric
+superconductors with a spin-orbit coupling larger than the Zeeman energy at
+$H_{c2}(0)$ by taking account of the mixing of spin-singlet and triplet pairing
+states due to the missing parity. When the singlet and triplet pairing
+components are mixed with an equal weight in a cubic non-centrosymmetric
+system, the paramagnetic depairing effect is significantly suppressed so that
+$H_{c2}(T)$ approaches its orbital-limited value. A similar event also occurs
+in a quasi two-dimensional Rashba non-centrosymmetric system. The present
+results are relevant to the $H$-$T$ phase diagrams of CePt$_3$Si and the
+families of Li$_2$Pd$_{3-x}$Pt$_x$B.",0810.1820v2
+2010-03-22,Magnetic excitations of spin and orbital moments in cobalt oxide,"Magnetic and phonon excitations in the antiferromagnet CoO with an unquenched
+orbital angular momentum are studied by neutron scattering. Results of energy
+scans in several Brillouin zones in the (HHL) plane for energy transfers up to
+16 THz are presented. The measurements were performed in the antiferromagnetic
+ordered state at 6 K (well below TN~290 K) as well as in the paramagnetic state
+at 450 K. Several magnetic excitation modes are identified from the dependence
+of their intensity on wavevector and temperature. Within a Hund's rule model
+the excitations correspond to fluctuations of coupled orbital and spin degrees
+of freedom whose bandwidth is controlled by interionic superexchange. The
+different <111> ordering domains give rise to several magnetic peaks at each
+wavevector transfer.",1003.4166v1
+2011-07-28,Two-Spinon and Orbital Excitations of the Spin-Peierls System TiOCl,"We combine high-resolution resonant inelastic x-ray scattering with cluster
+calculations utilizing a recently derived effective magnetic scattering
+operator to analyze the polarization, excitation energy, and momentum dependent
+excitation spectrum of the low-dimensional quantum magnet TiOCl in the range
+expected for orbital and magnetic excitations (0 - 2.5 eV). Ti 3d orbital
+excitations yield complete information on the temperature-dependent
+crystal-field splitting. In the spin-Peierls phase we observe a dispersive
+two-spinon excitation and estimate the inter- and intra-dimer magnetic exchange
+coupling from a comparison to cluster calculations.",1107.5800v2
+2013-07-23,S-wave Superconductivity due to Orbital and Spin fluctuations in Fe-pnictides: Self-Consistent Vertex Correction with Self-Energy (SC-VCΣ) Analysis,"To understand the amazing variety of the superconducting states of Fe-based
+superconductors, we analyze the multiorbital Hubbard models for LaFeAsO and
+LiFeAs going beyond the random-phase approximation (RPA), by calculating the
+vertex correction (VC) and self-energy correction. Due to the spin+orbital mode
+coupling described by the VC, both orbital and spin fluctuations mutually
+develop, consistently with the experimental phase diagram with the orbital and
+magnetic orders. Due to both fluctuations, the s-wave gap function with
+sign-reversal ($s_{\pm}$-wave), without sign-reversal ($s_{++}$-wave), and
+nodal s-wave states are obtained, compatible with the experimental wide variety
+of the gap structure. Thus, the present theory provides a microscopic
+explanation of the normal and superconducting phase diagram based on the
+realistic Hubbard model.",1307.6119v2
+2013-12-01,"Electronic structure, cohesive properties and magnetism of SrRuO$_3$; a theoretical investigation","We have performed an extensive test of the ability of density functional
+theory within several approximations for the exchange-correlation functional,
+local density approximation+Hubbard $U$ and local density approximation +
+dynamic mean field theory to describe magnetic and electronic properties of
+SrRuO$_3$. We focus on the ferromagnetic phase, illustrating differences
+between the orthorhombic low temperature structure vs the cubic high
+temperature structure. We assess how magnetism, spectral function, and cohesive
+properties are affected by methodology, on-site Hubbard $U$ and double counting
+corrections. Further, we compare the impact of the impurity solver on the
+quasiparticle weight $Z$, which is in turn compared to experimental results.
+The spectral functions resulting from the different treatments are also
+compared to experimental data. The impact of spin-orbit coupling is also
+studied, allowing us to determine the orbital moments. In the orthorhombic
+phase the orbital moments are found to be tilted with respect to the spin
+moments, emphasising the importance of taking into account the distortion of
+the oxygen octahedra.",1312.0270v2
+2015-05-05,"Suppression of magnetism in Ba5AlIr2O11: interplay of Hund's coupling, molecular orbitals and spin-orbit interaction","The electronic and magnetic properties of Ba$_5$AlIr$_2$O$_{11}$ containing
+Ir-Ir dimers are investigated using the GGA and GGA+SOC calculations. We found
+that strong suppression of the magnetic moment in this compound recently found
+in [J. Terzic {\it et al.}, Phys. Rev. B {\bf 91}, 235147 (2015)] is not due to
+charge-ordering, but is related to the joint effect of the spin-orbit
+interaction and strong covalency, resulting in the formation of metal-metal
+bonds. They conspire and act against the intra-atomic Hund's rule exchange
+interaction to reduce total magnetic moment of the dimer. We argue that the
+same mechanism could be relevant for other $4d$ and $5d$ dimerized transition
+metal compounds.",1505.00877v2
+2015-06-12,"A Study of Shell Model Neutron States in $^{207,209}Pb$ Using the Generalized Woods-Saxon plus Spin-Orbit Potential","The experimental binding energies of single-particle and single-hole neutron
+states belonging to neutron shells that extend from N = 126 to 184 and 82 to
+126 respectively, have been reproduced by solving the Schr\""{o}dinger equation
+with a potential that has two components: the generalized Woods-Saxon (GWS)
+potential and the spin-orbit (SO) coupling term. The GWS potential contains the
+traditional WS potential plus a term (SU) whose intensity reaches a maximum in
+the nuclear surface. Our results indicate the existence of a explicit
+relationship between the strength of the SU potential and the orbital angular
+momentum quantum number $\ell$ of the state. This dependence has been used to
+make reasonable predictions for the excitation energy centroids of states
+located inside and outside the neutron shells investigated. Comparisons are
+made with results reported in previous investigations.",1506.04055v2
+2015-09-11,Two-magnon Raman scattering and pseudospin-lattice interactions in Sr2IrO4 and Sr3Ir2O7,"We have used Raman scattering to investigate the magnetic excitations and
+lattice dynamics in the prototypical spin-orbit Mott insulators Sr2IrO4 and
+Sr3Ir2O7. Both compounds exhibit pronounced two-magnon Raman scattering
+features with different energies, lineshapes, and temperature dependencies,
+which in part reflect the different influence of long-range frustrating
+exchange interactions. Additionally, we find strong Fano asymmetries in the
+lineshapes of low-energy phonon modes in both compounds, which disappear upon
+cooling below the antiferromagnetic ordering temperatures. These unusual phonon
+anomalies indicate that the spin-orbit coupling in Mott-insulating iridates is
+not sufficiently strong to quench the orbital dynamics in the paramagnetic
+state.",1509.03396v1
+2016-08-14,Composite electronic orders induced by orbital Kondo effect,"In a large number of rare-earth and actinide systems, Kondo effect tends to
+suppress magnetic order by making the spin singlet between localized and
+conduction electron spins. In the presence of orbital degrees of freedom,
+however, there emerge exotic electronic orders induced by Kondo effect. The
+orbital Kondo effect can collectively make diagonal and off-diagonal
+(superconducting) orders. With the particle-hole symmetry in conduction bands,
+these orders are all degenerate, forming a macroscopic SO(5) multiplet. This
+paper discusses recent theoretical development on these electronic orders which
+are relevant to Pr$^{3+}$ and U$^{4+}$ systems with even number of $f$
+electrons per site. In the superconducting order, each conduction-electron pair
+is coupled with local degrees of freedom, forming a composite entity with a
+staggered spatial pattern. The quasi-particle spectrum is best interpreted as
+virtual hybridization with resonant states at the Fermi level. Possible order
+parameter for URu$_2$Si$_2$ in the hidden order state is discussed in the
+context of composite orders. Briefly discussed are related issues such as
+homogeneous odd-frequency pairing and SO(5) theory for high-temperature
+superconductors.",1608.04076v1
+2017-10-11,Effects of finite coverage on global polarization observables in heavy ion collisions,"In non-central relativistic heavy ion collisions, the created matter
+possesses a large initial orbital angular momentum. Particles produced in the
+collisions could be polarized globally in the direction of the orbital angular
+momentum due to spin-orbit coupling. Recently, the STAR experiment has
+presented polarization signals for $\Lambda$ hyperons and possible spin
+alignment signals for $\phi$ mesons. Here we discuss the effects of finite
+coverage on these observables. The results from a multi-phase transport and a
+toy model both indicate that a pseudorapidity coverage narrower than $|\eta|<
+\sim 1$ will generate a larger value for the extracted $\phi$-meson $\rho_{00}$
+parameter; thus a finite coverage can lead to an artificial deviation of
+$\rho_{00}$ from 1/3. We also show that a finite $\eta$ and $p_T$ coverage
+affect the extracted $p_H$ parameter for $\Lambda$ hyperons when the real $p_H$
+value is non-zero. Therefore proper corrections are necessary to reliably
+quantify the global polarization with experimental observables.",1710.03895v2
+2017-10-27,Enhanced Magneto-optical Kerr Effect at Fe/Insulator Interfaces,"Using density functional theory calculations, we have found an enhanced
+magneto-optical Kerr effect in Fe/insulator interfaces. The results of our
+study indicate that interfacial Fe atoms in the Fe films have a low-dimensional
+nature, which causes the following two effects: (i) The diagonal component
+$\sigma_{xx}$ of the optical conductivity decreases dramatically because the
+hopping integral for electrons between Fe atoms is suppressed by the low
+dimensionality. (ii) The off-diagonal component $\sigma_{xy}$ of the optical
+conductivity does not change at low photon energies, but it is enhanced at
+photon energies around 2 eV, where we obtain enhanced orbital magnetic moments
+and spin-orbit correlations for the interfacial Fe atoms. A large Kerr angle
+develops in proportion to the ratio $\sigma_{xy}/\sigma_{xx}$. Our findings
+indicate an efficient way to enhance the effect of spin-orbit coupling at
+metal/insulator interfaces without using heavy elements.",1710.09986v1
+2018-03-01,"Charge density functional plus $U$ theory of LaMnO$_3$: Phase diagram, electronic structure, and magnetic interaction","We perform charge density functional theory plus $U$ calculation of
+LaMnO$_3$. While all the previous calculations were based on spin density
+functionals, our result and analysis show that the use of spin-unpolarized
+charge-only density is crucial to correctly describe the phase diagram,
+electronic structure and magnetic property. Using magnetic force linear
+response calculation, a long-standing issue is clarified regarding the second
+neighbor out-of-plane interaction strength. We also estimate the
+orbital-resolved magnetic couplings. Remarkably, the inter-orbital
+$e_g$-$t_{2g}$ interaction is quite significant due to the Jahn-Teller
+distortion and orbital ordering.",1803.00213v1
+2018-08-28,Lateral Interfaces of Transition Metal Dichalcogenides: A Stable Tunable One-Dimensional Physics Platform,"We study in-plane lateral heterostructures of commensurate transition-metal
+dichalcogenides, such as MoS$_{2}$-WS$_{2}$ and MoSe$_{2}$-WSe$_{2}$, and find
+interfacial and edge states that are highly localized to these regions of the
+heterostructure. These are one-dimensional (1D) in nature, lying within the
+bandgap of the bulk structure and exhibiting complex orbital and spin
+structure. We describe such heteroribbons with a three-orbital tight-binding
+model that uses first principles and experimental parameters as input, allowing
+us to model realistic systems. Analytical modeling for the 1D interfacial bands
+results in long-range hoppings due to the hybridization along the interface,
+with strong spin-orbit couplings. We further explore the
+Ruderman-Kittel-Kasuya-Yosida indirect interaction between magnetic impurities
+located at the interface. The unusual features of the interface states result
+in effective long-range exchange non-collinear interactions between impurities.
+These results suggest that transition-metal dichalcogenide interfaces could
+serve as stable, tunable 1D platform with unique properties for possible use in
+exploring Majorana fermions, plasma excitations and spintronics applications.",1808.09402v2
+2019-04-05,Multi-dimensional entanglement transport through single-mode fibre,"The global quantum network requires the distribution of entangled states over
+long distances, with significant advances already demonstrated using entangled
+polarisation states, reaching approximately 1200 km in free space and 100 km in
+optical fibre. Packing more information into each photon requires Hilbert
+spaces with higher dimensionality, for example, that of spatial modes of light.
+However spatial mode entanglement transport requires custom multimode fibre and
+is limited by decoherence induced mode coupling. Here we transport
+multi-dimensional entangled states down conventional single-mode fibre (SMF).
+We achieve this by entangling the spin-orbit degrees of freedom of a bi-photon
+pair, passing the polarisation (spin) photon down the SMF while accessing
+multi-dimensional orbital angular momentum (orbital) subspaces with the other.
+We show high fidelity hybrid entanglement preservation down 250 m of SMF across
+multiple 2x2 dimensions, demonstrating quantum key distribution protocols,
+quantum state tomographies and quantum erasers. This work offers an alternative
+approach to spatial mode entanglement transport that facilitates deployment in
+legacy networks across conventional fibre.",1904.03114v1
+2020-05-07,Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys,"Mn-based alloys exhibit unique properties in the spintronics materials
+possessing perpendicular magnetic anisotropy (PMA) beyond the Fe and Co-based
+alloys. It is desired to figure out the quantum physics of PMA inherent to
+Mn-based alloys, which have never been reported. Here, the origin of PMA in
+ferrimagnetic Mn$_{3-{\delta}}$Ga ordered alloys is investigated to resolve
+antiparallel-coupled Mn sites using x-ray magnetic circular and linear
+dichroism (XMCD/XMLD) and a first-principles calculation. We found that the
+contribution of orbital magnetic moments in PMA is small from XMCD and that the
+finite quadrupole-like orbital distortion through spin-flipped electron hopping
+is dominant from XMLD and theoretical calculations. These findings suggest that
+the spin-flipped orbital quadrupole formations originate from the PMA in
+Mn$_{3-{\delta}}$Ga and bring the paradigm shift in the researches of PMA
+materials using x-ray magnetic spectroscopies.",2005.03249v1
+2021-04-23,Evidence of topological Shiba bands in artificial spin chains on superconductors,"A major challenge in developing topological superconductors for implementing
+topological quantum computing is their characterization and control. It has
+been proposed that a p-wave gapped topological superconductor can be fabricated
+with single-atom precision by assembling chains of magnetic atoms on s-wave
+superconductors with spin-orbit coupling. Here, we analyze the Bogoliubov
+quasiparticle interference in atom-by-atom constructed Mn chains on Nb(110) and
+for the first time reveal the formation of multi-orbital Shiba bands using
+momentum resolved measurements. We find evidence that one band features a
+topologically non-trivial p-wave gap as inferred from its shape and
+particle-hole asymmetric intensity. Our work is an important step towards a
+distinct experimental determination of topological phases in multi-orbital
+systems by bulk electron band structure properties only.",2104.11497v2
+2019-06-08,Possible emergence of a skyrmion phase in ferroelectric GaMo$_4$S$_8$,"Polar lacunar spinels, such as GaV$_4$S$_8$ and GaV$_4$Se$_8$, were proposed
+to host skyrmion phases under magnetic field. In this work, we put forward, as
+a candidate for N\'eel-type skyrmion lattice, the isostructural GaMo$_4$S$_8$,
+here systematically studied via both first-principles calculations and Monte
+Carlo simulations of model Hamiltonian. Electric polarization, driven by
+Jahn-Teller distortion, is predicted to arise in GaMo$_4$S$_8$, showing a
+comparable size but an opposite sign with respect to that evaluated in V-based
+counterparts and explained in terms of different electron counting arguments
+and resulting distortions. Interestingly, a larger spin-orbit coupling of 4d
+orbitals with respect to 3d orbitals in vanadium-spinels leads to stronger
+Dzyaloshinskii-Moriya interactions, which are beneficial to stabilize a
+cycloidal spin texture, as well as smaller-sized skyrmions (radius<10 nm).
+Furthermore, the possibly large exchange anisotropy of GaMo4S8 may lead to a
+ferroelectric-ferromagnetic ground state, as an alternative to the
+ferroelectric-skyrmionic one, calling for further experimental verification.",1906.03399v1
+2022-02-09,Gate tunable anomalous Hall effect at (111) LaAlO$_3$/SrTiO$_3$ interface,"We present the theoretical prediction of a gate tunable anomalous Hall effect
+(AHE) in an oxide interface as a hallmark of spin-orbit coupling. The observed
+AHE at low-temperatures in the presence of an external magnetic field emerges
+from a complex structure of the Berry curvature of the electrons on the Fermi
+surface and strongly depends on the orbital character of the occupied bands. A
+detailed picture of the results comes from a multiband low-energy model with a
+generalized Rashba interaction that supports characteristic out-of-plane spin
+and orbital textures. We discuss strategies for optimizing the intrinsic AHE in
+(111) SrTiO$_3$ heterostructure interfaces.",2202.04664v1
+2022-07-05,Strong bulk Dzyaloshinskii-Moriya interaction in composition-uniform centrosymmetric magnetic single layers,"Dzyaloshinskii-Moriya interaction (DMI) is the key ingredient of chiral
+spintronic phenomena and the emerging technologies based on such phenomena. A
+nonzero DMI usually occurs at magnetic interfaces or within non-centrosymmetric
+single crystals. Here, we report the observation of a strong unexpected DMI
+within a centrosymmetric polycrystalline ferromagnet that has neither a crystal
+inversion symmetry breaking nor a composition gradient. This DMI is a bulk
+effect, increases with the thickness of the magnetic layer, and is insensitive
+to the symmetry of the interfaces or the neighboring materials. We observe a
+total DMI strength that is a factor of >2 greater than the highest interfacial
+DMI in the literature. This DMI most likely arises from the strong spin-orbit
+coupling, strong orbital hybridization, and a ""hidden"" long-range asymmetry in
+the material. Our discovery of the strong unconventional bulk DMI in
+centrosymmetric, composition-uniform magnetic single layers provide fundamental
+building blocks for the emerging field of spintronics and will stimulate the
+exploitation of unconventional spin-orbit phenomena in a wide range of
+materials.",2207.01766v1
+2022-08-17,Photoinduced Pseudospin Polarization in a Three-Orbital Hubbard Model,"In a Hubbard model for the Kitaev spin-liquid candidate material
+$\alpha$-RuCl$_3$ with three $t_{2g}$ orbitals per Ru site, we calculate
+photoinduced dynamics based on the exact diagonalization method and interpret
+them with the help of a high-frequency expansion in quantum Floquet theory. The
+high-frequency expansion shows two types of effective magnetic fields during
+the application of a circularly polarized light field. One of them originates
+from spin-orbit coupling and is within the honeycomb lattice. The other is of
+purely kinetic origin and perpendicular to the lattice. The former fields are
+antiparallel at the two sites within a unit cell and rotate in accordance with
+the momentum distribution of holes that follow the light field. When the light
+field is weak, pseudospin dynamics are governed by the former fields; thus, the
+average of the pseudospins almost vanishes. The latter fields are parallel at
+the two sites within a unit cell and produce nonzero perpendicular components
+of the pseudospins when the light field is strong. Numerically obtained
+perpendicular components are consistent with the latter fields when the
+frequency of the light field is well below the Mott gap. The relevance to the
+inverse Faraday effect recently observed in $\alpha$-RuCl$_3$ is discussed.",2208.08531v1
+2022-11-07,When Plasmonic Colloids Meet Optical Vortices -- A Brief Review,"Structured light has emerged as an important tool to interrogate and
+manipulate matter at micron and sub-micron scale. One form of structured light
+is an optical vortex beam. The helical wavefront of these vortices carry
+orbital angular momentum which can be transferred to a Brownian colloid. When
+the colloid is made of metallic nanostructures, such as silver and gold,
+resonant optical effects play a vital role, and the interaction leads to
+complex dynamics and assembly. This brief review aims to discuss some recent
+work on trapping plasmonic colloids with optical vortices and their lattices.
+The role of optical scattering and absorption has important implications on the
+underlying forces and torques, which is specifically enunciated. The effect of
+spin and orbital angular momentum in an optical vortex can lead to spin-orbit
+coupling dynamics, and these effects are highlighted with examples from the
+literature. In addition to assembly and dynamics, enhanced Brownian motion of
+plasmonic colloids under the influence of a vortex-lattice is discussed. The
+pedagogical aspects to understand the interaction between optical vortex and
+plasmonic colloids is emphasized.",2211.03547v1
+2023-04-12,Janus monolayer TaNF: a new ferrovalley material with large valley splitting and tunable magnetic properties,"Materials with large intrinsic valley splitting and high Curie temperature
+are a huge advantage for studying valleytronics and practical applications. In
+this work, using first-principles calculations, a new Janus TaNF monolayer is
+predicted to exhibit excellent piezoelectric properties and intrinsic valley
+splitting, resulting from the spontaneous spin polarization, the spatial
+inversion symmetry breaking and strong spin-orbit coupling (SOC). TaNF is also
+a potential two-dimensional (2D) magnetic material due to its high Curie
+temperature and huge magnetic anisotropy energy. The effective control of the
+band gap of TaNF can be achieved by biaxial strain, which can transform TaNF
+monolayer from semiconductor to semi-metal. The magnitude of valley splitting
+at the CBM can be effectively tuned by biaxial strain due to the changes of
+orbital composition at the valleys. The magnetic anisotropy energy (MAE) can be
+manipulated by changing the energy and occupation (unoccupation) states of d
+orbital compositions through biaxial strain. In addition, Curie temperature
+reaches 373 K under only -3% biaxial strain, indicating that Janus TaNF
+monolayer can be used at high temperatures for spintronic and valleytronic
+devices.",2304.05670v1
+2012-08-08,"Interplay between lattice, orbital, and magnetic degrees of freedom in the chain-polymer Cu(II) breathing crystals","The chain-polymer Cu(II) breathing crystals C21H19CuF12N4O6 were studied
+using the x-ray diffraction and ab initio band structure calculations. We show
+that the crystal structure modification at T=146 K, associated with the spin
+crossover transition, induces the changes of the orbital order in half of the
+Cu sites. This in turn results in the switch of the magnetic interaction sign
+in accordance with the Goodenough-Kanamori-Andersen theory of the coupling
+between the orbital and spin degrees of freedom.",1208.1624v2
+2013-01-17,The planetary spin and rotation period: A modern approach,"Using a new approach, we have obtained a formula for calculating the rotation
+period and radius of planets. In the ordinary gravitomagnetism the
+gravitational spin ($S$) orbit ($L$) coupling, $\vec{L}\cdot\vec{S}\propto
+L^2$, while our model predicts that $\vec{L}\cdot\vec{S}\propto
+\frac{m}{M}\,L^2$, where $M$ and $m$ are the central and orbiting masses,
+respectively.
+  Hence, planets during their evolution exchange $L$ and $S$ until they reach a
+final stability at which $MS\propto mL$, or $S\propto \frac{m^2}{v}$, where $v$
+is the orbital velocity of the planet.
+  Rotational properties of our planetary system and exoplanets are in agreement
+with our predictions.
+  The radius ($R$) and rotational period ($D$) of tidally locked planet at a
+distance $a$ from its star, are related by, $D^2\propto
+\sqrt{\frac{M}{m^3}}\,\,R^3$ and that $R\propto \sqrt{\frac{m}{M}}\,\, a$.$a$
+from its star, are related by, $D^2\propto \sqrt{\frac{M}{m^3}} R^3$ and that
+$R\propto \sqrt{\frac{m}{M}} a$.",1301.4720v2
+2013-06-26,Observation of the SU(4) Kondo state in a double quantum dot,"Central to condensed matter physics are quantum impurity models, which
+describe how a local degree of freedom interacts with a continuum.
+Surprisingly, these models are often universal in that they can quantitatively
+describe many outwardly unrelated physical systems. Here we develop a double
+quantum dot-based experimental realization of the SU(4) Kondo model, which
+describes the maximally symmetric screening of a local four-fold degeneracy. As
+demonstrated through transport measurements and detailed numerical
+renormalization group calculations, our device affords exquisite control over
+orbital and spin physics. Because the two quantum dots are coupled only
+capacitively, we can achieve orbital state- or ""pseudospin""-resolved bias
+spectroscopy, providing intimate access to the interplay of spin and orbital
+Kondo effects. This cannot be achieved in the few other systems realizing the
+SU(4) Kondo state.",1306.6326v1
+2014-04-03,Three-Leaf Quantum Interference Clovers in a Trigonal Single-Molecule Magnet,"The control of spin-orbit coupling (SOC) at the microscopic level has become
+a major research quest within the magnetism and spintronics communities.
+Altering the interaction between the spin and orbital degrees of freedom can
+fundamentally alter the electronic structure of a system, including electronic
+band inversion, and lead to new states of matter such as topological
+insulators. Whether based on high SOC lanthanides or transition metal ions,
+where the crystal field often quenches the orbital angular momentum,
+single-molecule magnets are an excellent playground for the study of the more
+fundamental aspects of this interaction and its intrinsic symmetries. This is
+the case of the molecular magnet reported in this article, where the trigonal
+symmetry imposed by the spatial arrangement of three constituent manganese ions
+and the corresponding orientations of their SOC anisotropy tensors result in a
+fascinating three-fold angular modulation of the quantum tunneling of the
+magnetization (QTM) rates never before observed, as well as in trigonal quantum
+interference patterns that mimic the form of a three-leaf clover.",1404.1114v1
+2015-02-08,Artificial Gauge Field and Quantum Spin Hall States in a Conventional Two-dimensional Electron Gas,"Based on the Born-Oppemheimer approximation, we divide total electron
+Hamiltonian in a spinorbit coupled system into slow orbital motion and fast
+interband transition process. We find that the fast motion induces a gauge
+field on slow orbital motion, perpendicular to electron momentum, inducing a
+topological phase. From this general designing principle, we present a theory
+for generating artificial gauge field and topological phase in a conventional
+two-dimensional electron gas embedded in parabolically graded
+GaAs/In$_{x}$Ga$_{1-x}$As/GaAs quantum wells with antidot lattices. By tuning
+the etching depth and period of antidot lattices, the band folding caused by
+superimposed potential leads to formation of minibands and band inversions
+between the neighboring subbands. The intersubband spin-orbit interaction opens
+considerably large nontrivial minigaps and leads to many pairs of helical edge
+states in these gaps.",1502.02656v2
+2015-05-09,Spin-orbit-free Weyl-loop and Weyl-point semimetals in a stable three-dimensional carbon allotrope,"Topological band theory has revolutionized our understanding of electronic
+structure of materials, in particular, a novel state - Weyl semimetal - has
+been predicted for systems with strong spin-orbit coupling (SOC). Here, a new
+class of Weyl semimetals, solely made of light elements with negligible SOC, is
+proposed. Our first-principles calculations show that conjugated p orbital
+interactions in a three-dimensional pure carbon network, termed interpenetrated
+graphene network, is sufficient to produce the same Weyl physics. This carbon
+allotrope has an exceptionally good structural stability. Its Fermi surface
+consists of two symmetry-protected Weyl loops with linear dispersion along
+perpendicular directions. Upon the breaking of inversion symmetry, each Weyl
+loop is reduced to a pair of Weyl points. The surface band of the network is
+nearly flat with a very large density of states at the Fermi level. It is
+reduced to Fermi arcs upon the symmetry breaking, as expected.",1505.02284v1
+2017-04-17,Electronically highly cubic conditions for Ru in alpha-RuCl3,"We studied the local Ru 4d electronic structure of alpha-RuCl3 by means of
+polarization dependent x-ray absorption spectroscopy at the Ru-L2,3 edges. We
+observed a vanishingly small linear dichroism indicating that electronically
+the Ru 4d local symmetry is highly cubic. Using full multiplet cluster
+calculations we were able to reproduce the spectra excellently and to extract
+that the trigonal splitting of the t2g orbitals is -12 $\pm10$ meV, i.e.
+negligible as compared to the Ru 4d spin-orbit coupling constant. Consistent
+with our magnetic circular dichroism measurements, we found that the ratio of
+the orbital and spin moments is 2.0, the value expected for a Jeff = 1/2 ground
+state. We have thus shown that as far as the Ru 4d local properties are
+concerned, alpha-RuCl3 is an ideal candidate for the realization of Kitaev
+physics.",1704.05100v1
+2019-09-09,Electrical Control of Large Rashba Effect in Oxide Heterostructures,"Large Rashba effect efficiently tuned by an external electric field is highly
+desired for spintronic devices. Using first-principles calculations, we
+demonstrate that large Rashba splitting is locked at conduction band minimum in
+ferroelectric Bi(Sc/Y/La/Al/Ga/In)O3/PbTiO3 heterostructures where the position
+of Fermi level is precisely controlled via its stoichiometry. Fully reversible
+Rashba spin texture and drastic change of Rashba splitting strength with
+ferroelectric polarization switching are realized in the symmetric and
+asymmetric heterostructures, respectively. By artificially tuning the local
+ferroelectric displacement and the orbital hybridization, the synergetic effect
+of local potential gradient and orbital overlap on the dramatic change of
+splitting strength is confirmed. These results improve the feasibility of
+utilizing Rashba spin-orbit coupling in spintronic devices.",1909.03727v1
+2019-03-18,Type-II Ising Pairing in Few-Layer Stanene,"Spin-orbit coupling has proven indispensable in realizing topological
+materials and more recently Ising pairing in two-dimensional superconductors.
+This pairing mechanism relies on inversion symmetry breaking and sustains
+anomalously large in-plane polarizing magnetic fields whose upper limit is
+expected to diverge at low temperatures, although experimental demonstration of
+this has remained elusive due to the required fields. In this work, the
+recently discovered superconductor few-layer stanene, i.e. epitaxially strained
+$\alpha$-Sn, is shown to exhibit a new type of Ising pairing between carriers
+residing in bands with different orbital indices near the $\Gamma$-point. The
+bands are split as a result of spin-orbit locking without the participation of
+inversion symmetry breaking. The in-plane upper critical field is strongly
+enhanced at ultra-low temperature and reveals the sought for upturn.",1903.07627v1
+2017-11-16,Extended orbital modeling of spin qubits in double quantum dots,"Orbital modeling of two electron spins confined in a double quantum dot is
+revisited. We develop an extended Hund Mulliken approach that includes excited
+orbitals, allowing for a triplet configuration with both electrons residing in
+a single dot. This model improves the reliability and applicability of the
+standard Hund Mulliken approximation, while remaining largely analytical, thus
+it enables us to identify the mechanisms behind the exchange coupling dynamics
+that we find. In particular, our calculations are in close agreement with
+exchange values that were recently measured at a high interdot bias regime,
+where the double occupancy triplet configuration is energetically accessible,
+demonstrating reduced sensitivity to bias fluctuations, while maintaining the
+large exchange needed for fast gating.",1711.06292v2
+2020-06-17,Tunable spin and orbital polarization in SrTiO3-based heterostructures,"We formulate the effective Hamiltonian of Rashba spin-orbit coupling (RSOC)
+in $\mathrm{LaAlO_3/SrTiO_3}$ (LAO/STO) heterostructures. We derive analytical
+expressions of properties, e.g., Rashba parameter, effective mass, band edge
+energy and orbital occupancy, as functions of material and tunable
+heterostructure parameters. While linear RSOC is dominant around the
+$\Gamma$-point, cubic RSOC becomes significant at the higher-energy
+anti-crossing region. We find that linear RSOC stems from the structural
+inversion asymmetry (SIA), while the cubic term is induced by both SIA and bulk
+asymmetry. Furthermore, the SOC strength shows a striking dependence on the
+tunable heterostructure parameters such as STO thickness and the interfacial
+electric field which is ascribed to the quantum confinement effect near the
+LAO/STO interface. The calculated values of the linear and cubic RSOC are in
+agreement with previous experimental results.",2006.09617v1
+2021-07-02,Three-dimensional Stacking of Canted Antiferromagnetism and Pseudospin Current in Undoped Sr$_2$IrO$_4$: Symmetry Analysis and Microscopic Model Realization,"Recent optical second-harmonic generation experiments observed unexpected
+broken spatial symmetries in the undoped spin-orbit Mott insulator
+Sr$_2$IrO$_4$, leading to intensive debates on the nature of its ground state.
+We propose that it is a canted antiferromagnetism with a hidden order of
+circulating staggered pseudospin current. Symmetry analysis shows that a proper
+$c$-axis stacking of the canted antiferromagnetism and the pseudospin current
+lead to a magnetoelectric coexistence state that breaks the two-fold rotation,
+inversion, and time-reversal symmetries, consistent with experimental
+observations. We construct a three-dimensional Hubbard model with spin-orbit
+coupling for the five localized 5$d$ Wannier orbitals centered at Ir sites, and
+demonstrate the microscopic realization of the desired coexistence state in a
+wide range of band parameters via a combination of self-consistent Hartree-Fock
+and variational calculations.",2107.00876v1
+2021-10-27,Manipulation of Jeff=3/2 states by tuning the tetragonal distortion,"The spin-orbit entangled quantum states in 4d/5d compounds, e.g., the
+Jeff=1/2 and Jeff=3/2 states, have attracted great interests for their unique
+physical roles in unconventional superconductivity and topological states.
+Here, the key role of tetragonal distortion is clarified, which determines the
+ground states of 4d1/5d1 systems to be the Jeff=3/2 one (e.g. K2NbCl6) or S=1/2
+one (e.g. Rb2NbCl6). By tuning the tetragonal distortion via epitaxial strain,
+the occupation weights of dxy/dyz/dxz orbitals can be subtly modulated,
+competing with the spin-orbit coupling. Consequently, quantum phase transitions
+between S=1/2 state and Jeff=3/2 state, as well as between different Jeff=3/2
+states, can be achieved, resulting in significant changes of local magnetic
+moments. Our prediction points out a reliable route to engineer new
+functionality of Jeff states in these quantum materials.",2110.14252v1
+2024-01-20,Inferring binary parameters with dual-line gravitational wave detection from tight inspiraling double neutron stars,"Neutron star (NS) binaries can be potentially intriguing gravitational wave
+(GW) sources, with both high- and low-frequency radiations from the possibly
+aspherical individual stars and the binary orbit, respectively. The successful
+detection of such a dual-line source could provide fresh insights into binary
+geometry and NS physics. In the absence of electromagnetic observations, we
+develop a strategy for inferring the spin-orbit misalignment angle using the
+tight dual-line double NS system under the spin-orbit coupling. Based on the
+four-year joint detection of a typical dual-line system with LISA and Cosmic
+Explorer, we find that the misalignment angle and the NS moment of inertia can
+be measured with sub-percentage and 5% accuracy, respectively.",2401.11241v1
+2020-03-04,Excitation of f-modes during mergers of spinning binary neutron star,"Tidal effects have important imprints on gravitational waves (GWs) emitted
+during the final stage of the coalescence of binaries that involve neutron
+stars (NSs). Dynamical tides can be significant when NS oscillations become
+resonant with orbital motion; understanding this process is important for
+accurately modeling GW emission from these binaries, and for extracting NS
+information from GW data. In this paper, we carry out a systematic study on the
+tidal excitation of fundamental modes of spinning NSs in coalescencing
+binaries, focusing on the case when the NS spin is anti-aligned with the
+orbital angular momentum-where the tidal resonance is most likely to take
+place. We first expand NS oscillations into stellar eigen-modes, and then
+obtain a Hamiltonian that governs the tidally coupled orbit-mode evolution. We
+next find a new approximation that can lead to analytic expressions of tidal
+excitations to a high accuracy, and are valid in all regimes of the binary
+evolution: adiabatic, resonant, and post-resonance. Using the method of
+osculating orbits, we obtain semi-analytic approximations to the orbital
+evolution and GW emission; their agreements with numerical results give us
+confidence in on our understanding of the system's dynamics. In particular, we
+recover both the averaged post-resonance evolution, which differs from the
+pre-resonance point-particle orbit by shifts in orbital energy and angular
+momentum, as well as instantaneous perturbations driven by the tidal motion.
+Finally, we use the Fisher matrix technique to study the effect of dynamical
+tides on parameter estimation. We find that the dynamical tides may potentially
+provide an additional channel to study the physics of NSs. The method presented
+in this paper is generic and not restricted to f mode; it can also be applied
+to other types of tide.",2003.02373v2
+2000-06-21,Gravitational Effects of Rotating Bodies,"We study two type effects of gravitational field on mechanical gyroscopes
+(i.e. rotating extended bodies). The first depends on special relativity and
+equivalence principle. The second is related to the coupling (i.e. a new force)
+between the spins of mechanical gyroscopes, which would violate the equivalent
+principle. In order to give a theoretical prediction to the second we suggest a
+spin-spin coupling model for two mechanical gyroscopes. An upper limit on the
+coupling strength is then determined by using the observed perihelion
+precession of the planet's orbits in solar system. We also give predictions
+violating the equivalence principle for free-fall gyroscopes .",0006075v2
+2016-06-26,Hyperfine coupling constants from internally contracted multireference perturbation theory,"We present an accurate method for calculating hyperfine coupling constants
+(HFCCs) based on the complete active space second-order perturbation theory
+(CASPT2) with full internal contraction. The HFCCs are computed as a
+first-order property using the relaxed CASPT2 spin-density matrix that takes
+into account orbital and configurational relaxation due to dynamical electron
+correlation. The first-order unrelaxed spin-density matrix is calculated from
+one- and two-body spin-free counterparts that are readily available in the
+CASPT2 nuclear gradient program [M. K. MacLeod and T. Shiozaki, J. Chem. Phys.
+142, 051103 (2015)], whereas the second-order part is computed directly using
+the newly extended automatic code generator. The relaxation contribution is
+then calculated from the so-called Z-vectors that are available in the CASPT2
+nuclear gradient program. Numerical results are presented for the CN and AlO
+radicals, for which the CASPT2 values are comparable (or, even superior in some
+cases) to the ones computed by the coupled-cluster and density matrix
+renormalization group methods. The HFCCs for the hexaaqua complexes with VII,
+CrIII, and MnII are also presented to demonstrate the accuracy and efficiency
+of our code.",1606.08032v2
+2020-12-18,A natural heavy-hole flopping mode qubit in germanium,"Flopping mode qubits in double quantum dots (DQDs) allow for coherent
+spin-photon hybridization and fast qubit gates when coupled to either an
+alternating external or a quantized cavity electric field. To achieve this,
+however, electronic systems rely on synthetic spin-orbit interaction (SOI) by
+means of a magnetic field gradient as a coupling mechanism. Here we
+theoretically show that this challenging experimental setup can be avoided in
+heavy-hole (HH) systems in germanium (Ge) by utilizing the sizeable cubic
+Rashba SOI. We argue that the resulting natural flopping mode qubit possesses
+highly tunable spin coupling strengths that allow for one- and two-qubit gate
+times in the nanosecond range when the system is designed to function in an
+optimal operation mode which we quantify.",2012.10214v1
+2020-10-02,Synthetic chiral magnets promoted by the Dzyaloshinskii-Moriya interaction,"The ability to engineer the interactions in assemblies of nanoscale magnets
+is central to the development of artificial spin systems and spintronic
+technologies. Following the emergence of the Dzyaloshinskii-Moriya interaction
+(DMI) in thin film magnetism, new routes have been opened to couple the
+nanomagnets via strong chiral interactions, which is complementary to the
+established dipolar and exchange coupling mechanisms. In this Perspective, we
+review recent progress in the engineering of synthetic magnets coupled by the
+interlayer and intralayer DMI. We show how multilayer chiral magnetic
+structures and two-dimensional synthetic antiferromagnets, skyrmions, and
+artificial spin systems can be realized by simultaneous control of the DMI and
+magnetic anisotropy. In addition, we show that, with the combination of DMI and
+current-induced spin-orbit torques, field-free switching of synthetic magnetic
+elements is obtained as well as all-electric domain wall logic circuits.",2010.01077v1
+2021-05-19,Long-living excited states of a 2D diamagnetic exciton,"Hydrogenic excited states of a 2D exciton are degenerate. In the presence of
+a weak magnetic field, the $S$-states with a zero momentum of the center of
+mass get coupled to the $P$-states with finite momentum of the center of mass.
+This field-induced coupling leads to a strong modification of the dispersion
+branches of the exciton spectrum. Namely, the lower branch acquires a shape of
+a ""mexican hat"" with a minimum at a finite momentum. At certain magnetic field,
+exciton branches exhibit a linear crossing, similarly to the spectrum of a 2D
+electron in the presence of spin-orbit coupling. While spin is not involved,
+degenerate $S$ and $P$ states play the role of the spin projections. Lifting of
+degeneracy due to diamagnetic shifts and deviation of electron-hole attraction
+from purely Coulomb suppresses the linear crossing.",2105.08914v1
+2021-09-30,Interaction of magnons with plasmons in a system of antiferromagnetic insulators coupled to a superconductor microwave cavity through the interfacial exchange interaction,"A superconductor can interact with magnets through the magnetic field which
+is induced by the supercurrent. However, this interaction is rather weak and
+requires relatively large magnets to reach a sizable hybridization of microwave
+electromagnetic modes with magnons. The size of the device can be drastically
+reduced by means of the large interfacial exchange interaction between spins in
+a magnet and a superconductor. In the spin-orbit coupled superconductor this
+interaction can be transmitted to the s-wave condensate through a mixing of
+triplet and singlet Cooper pairs. In this paper we theoretically consider thin
+antiferromagnetic films, which make a spin compensated contact to a
+superconducting wire, which forms a cavity for Mooij-Sch\""{o}n plasma waves.
+The effective Lagrangian is derived where the interaction of these waves with
+magnons is taken into account. Frequencies of hybrid magnon-plasmon modes are
+calculated. A system of two micromagnets placed far apart are also considered
+and their mutual coupling through the cavity mode is calculated.",2109.14973v1
+2005-09-14,Magnetic ordering in trigonal chain compounds,"We present electronic structure calculations for the one-dimensional magnetic
+chain compounds Ca_3CoRhO_6 and Ca_3FeRhO_6. The calculations are based on
+density functional theory and the local density approximation. We use the
+augmented spherical wave (ASW) method. The observed alternation of low- and
+high-spin states along the Co-Rh and Fe-Rh chains is related to differences in
+the oxygen coordination of the transition metal sites. Due to strong
+hybridization the O 2p states are polarized, giving rise to extended localized
+magnetic moments centered at the high-spin sites. Strong metal-metal overlap
+along the chains leads to a substantial contribution of the low-spin Rh
+4d_{3z^2-r^2} orbitals to the exchange coupling of the extended moments.
+Interestingly, this mechanism holds for both compounds, even though the
+coupling is ferromagnetic for the cobalt and antiferromagnetic for the iron
+compound. However, our results allow to understand the different types of
+coupling from the filling dependence of the electronic properties.",0509374v1
+2009-01-29,Electric field tunable exchange interaction in InAs/GaAs coupled quantum dots,"Spin manipulation in coupled quantum dots is of interest for quantum
+information applications. Control of the exchange interaction between electrons
+and holes via an applied electric field may provide a promising technique for
+such spin control. Polarization dependent photoluminescence (PL) spectra were
+used to investigate the spin dependent interactions in coupled quantum dot
+systems and by varying an electric field, the ground state hole energy levels
+are brought into resonance, resulting in the formation of molecular orbitals
+observed as anticrossings between the direct and indirect transitions in the
+spectra. The indirect and direct transitions of the neutral exciton demonstrate
+high and low circular polarization memory respectively due to variation in the
+exchange interaction. The ratio between the polarization values as a function
+of electric field, and the barrier height was measured. These results indicate
+a possible method of tuning between indirect and direct configurations to
+control the degree of exchange interaction.",0901.4751v1
+2010-01-25,Approximate bound state solutions of Dirac equation with Hulthén potential including Coulomb-like tensor potential,"We solve the Dirac equation approximately for the attractive scalar $S(r)$
+and repulsive vector $V(r)$ Hulth\'{e}n potentials including a Coulomb-like
+tensor potential with arbitrary spin-orbit coupling quantum number $\kappa .$
+In the framework of the spin and pseudospin symmetric concept, we obtain the
+analytic energy spectrum and the corresponding two-component upper- and
+lower-spinors of the two Dirac particles by means of the Nikiforov-Uvarov
+method in closed form. The limit of zero tensor coupling and the
+non-relativistic solution are obtained. The energy spectrum for various levels
+is presented for several $\kappa $ values under the condition of exact spin
+symmetry in the presence or absence of tensor coupling.",1001.4327v2
+2010-11-01,Multi-stability in an optomechanical system with two-component Bose-Einstein condensate,"We investigate a system consisting of a two-component Bose-Einstein
+condensate interacting dispersively with a Fabry-Perot optical cavity where the
+two components of the condensate are resonantly coupled to each other by
+another classical field. The key feature of this system is that the atomic
+motional degrees of freedom and the internal pseudo-spin degrees of freedom are
+coupled to the cavity field simultaneously, hence an effective spin-orbital
+coupling within the condensate is induced by the cavity. The interplay among
+the atomic center- of-mass motion, the atomic collective spin and the cavity
+field leads to a strong nonlinearity, resulting in multi- stable behavior in
+both matter wave and light wave at the few-photon level.",1011.0394v2
+2012-10-18,Magnetic excitation spectra in pyrochlore iridates,"Metal-insulator transitions in pyrochlore iridates (A2Ir2O7) are believed to
+occur due to subtle interplay of spin-orbit coupling, geometric frustration,
+and electron interactions. In particular, the nature of magnetic ordering of
+iridium ions in the insulating phase is crucial for understanding of several
+exotic phases recently proposed for these materials. We study the spectrum of
+magnetic excitations in the intermediate-coupling regime for the so-called
+all-in/all-out magnetic state in pyrochlore iridates with non-magnetic A-site
+ions (A=Eu,Y), which is found to be preferred in previous theoretical studies.
+We find that the effect of charge fluctuations on the spin-waves in this regime
+leads to strong departure from the lowest-order spin-wave calculations based on
+models obtained in strong-coupling calculations. We discuss the characteristic
+features of the magnetic excitation spectrum that can lead to conclusive
+identification of the magnetic order in future resonant inelastic x-ray (or
+neutron) scattering experiments. Knowledge of the nature of magnetic order and
+its low-energy features may also provide useful information on the accompanying
+metal-insulator transition.",1210.5242v2
+2014-02-04,Rashba coupling induced spin susceptibility and magnetic phase transition of conduction electrons in monolayer graphene,"Using the Kubo formalism, the magnetic properties of the system in the linear
+regime have been investigated. Mainly the effect of non-magnetic substrate on
+the spin susceptibility is calculated. Results show that the Rashba coupling
+interaction has a central role in the magnetic response function of the system
+and it is really remarkable since this type of spin orbit coupling can be
+effectively controlled by an external gate voltage. Most importantly it was
+shown that, in the presence of the Rashba interaction a magnetic phase
+transition could be observed. This magnetic phase corresponds to a magnetic
+order of conduction electrons that takes place at some especial frequency of
+external magnetic field.",1402.0646v2
+2015-11-10,Triplet FFLO Superconductivity in the doped Kitaev-Heisenberg Honeycomb Model,"We provide analytical and numerical evidence of a spin-triplet FFLO
+superconductivity in the itinerant Kitaev-Heisenberg model (anti-ferromagnetic
+Kitaev coupling and ferromagnetic Heisenberg coupling) on the honeycomb lattice
+around quarter filling. The strong spin-orbit coupling in our model leads to
+the emergence of 6 inversion symmetry centers for the Fermi surface at non zero
+momenta in the first Brillouin zone. We show how the Cooper pairs condense into
+these non-trivial momenta, causing the spatial modulation of the
+superconducting order parameter. Applying a Ginzburg-Landau expansion analysis,
+we find that the superconductivity has three separated degenerate ground states
+with three different spin-triplet pairings. This picture is also supported by
+exact diagonalizations on finite clusters.",1511.03289v1
+2013-09-19,Exact spectral function for hole-magnon coupling in the ferromagnetic CuO$_3$-like chain,"We present the exact spectral function for a single oxygen hole with spin
+opposite to ferromagnetic order within a one-dimensional CuO$_{3}$-like spin
+chain. We find that local Kondo-like exchange interaction generates five
+different states in the strong coupling regime. It stabilizes a spin polaron
+which is a bound state of a moving charge dressed by magnon excitations, with
+essentially the same dispersion as predicted by mean field theory. We then
+examine in detail the evolution of the spectral function for increasing
+strength of the hole-magnon interaction. We also demonstrate that the $s$ and
+$p$ symmetry of orbital states in the conduction band are essentially
+equivalent to each other and find that the simplified models do not suffice to
+reproduce subtle aspects of hole-magnon coupling in the charge-transfer model.",1309.5054v1
+2018-01-22,Optical fingerprint of non-covalently functionalized transition metal dichalcogenides,"Atomically thin transition metal dichalcogenides (TMDs) hold promising
+potential for applications in optoelectronics. Due to their direct band gap and
+the extraordinarily strong Coulomb interaction, TMDs exhibit efficient
+light-matter coupling and tightly bound excitons. Moreover, large spin orbit
+coupling in combination with circular dichroism allows for spin and valley
+selective optical excitation. As atomically thin materials, they are very
+sensitive to changes in the surrounding environment. This motivates a
+functionalization approach, where external molecules are adsorbed to the
+materials surface to tailor its optical properties. Here, we apply the density
+matrix theory to investigate the potential of non-covalently functionalized
+TMDs. Considering exemplary spiropyran molecules with a strong dipole moment,
+we predict spectral redshifts and the appearance of an additional side peak in
+the absorption spectrum of functionalized TMDs. We show that the molecular
+characteristics, e.g. coverage, orientation and dipole moment, crucially
+influence the optical properties of TMDs, leaving a unique optical fingerprint
+in the absorption spectrum. Furthermore, we find that the molecular dipole
+moments open a channel for coherent intervalley coupling between the
+high-symmetry K and K' points which may open new possibilities for
+spin-valleytronics application.",1801.07039v1
+2021-06-26,Anomalous Andreev interferometer: Study of an anomalous Josephson junction coupled to a normal wire,"Josephson junctions (JJs), where both time-reversal and inversion symmetry
+are broken, exhibit a phase shift $\phi_0$ in their current-phase relation.
+This allows for an anomalous supercurrent to flow in the junction even in the
+absence of a phase bias between the superconductors. We show that a finite
+phase shift also manifests in the so-called Andreev interferometers - a device
+that consists of a mesoscopic conductor coupled to the $\phi_0$-junction. Due
+to the proximity effect, the resistance of this conductor is phase-sensitive -
+it oscillates by varying the phase of the JJ. As a result, the quasiparticle
+current $I_{\mathrm{qp}}$ flowing through the conductor has an anomalous
+component, which exists only at finite $\phi_0$. Thus, the Andreev
+interferometry could be used to probe the $\phi_0$ effect. We consider two
+realizations of the $\phi_0$-junction and calculate $I_{\mathrm{qp}}$ in the
+interferometer: a superconducting structure with spin-orbit coupling and a
+system of spin-split superconductors with spin-polarized tunneling barriers.",2106.14021v2
+2021-10-26,Spin-phonon coupling in Sr and Ti incorporated 9R-BaMnO3,"Materials having strong coupling between different degrees of freedom such as
+spin, lattice, orbital, and charge are of immense interest due to their
+potential device applications. Here, we have stabilized the 9R phase of BaMnO3,
+by Sr (Ti) doping in the Ba (Mn) site using solid-state route at ambient
+pressure, which otherwise requires high-pressure conditions to syntheize.
+Crsyatl structure, phonon spectra, and their evolution with temperature are
+investigated using x-ray diffraction and Raman spectroscopic techniques.
+Temperature-dependent magnetization data reveal an antiferromagnetic transition
+at around (TN =) 262 K and 200 K for Ba0.9Sr0.1MnO3 and BaMn0.9Ti0.1O3,
+respectively. No structural phase transition or lattice instabilities are
+observed in the measured temperature range (80 - 400 K) for both the compounds.
+We have observed anomalous behaviour of four different phonon modes involving
+Mn or O-vibrations at low temperatures which have been attributed to
+spin-phonon coupling.",2110.13737v1
+2021-10-25,Phonon Anomaly In 9R-Ba0.9Sr0.1MnO3,"Materials which possess coupling between different degrees of freedom such as
+charge, spin, orbital and lattice are of tremendous interest due to their
+potential for device applications. It has been recently realized that some of
+manganite perovskite oxides show structural and ferroelectric instabilities
+which may be tuned by imposing internal or external strain. Among manganite
+perovskites, AMnO3 (A = Ca, Sr and Ba) are reported to be good candidates to
+show spin-phonon coupling driven multiferroicity. Here, we have probed the
+correlation between vibrational and magnetic properties in the 9R-type
+hexagonal Ba0.9Sr0.1MnO3 (BSM10). Nine Raman active modes are observed which
+are characteristic phonon modes for 9R phase. The frequency ({omega}) of an Eg
+(344 cm-1) mode which is related to Mn vibrations shows anomaly with
+temperature (T) manifested as a change in slope of {omega} vs T at 260 K. The
+temperature-dependent magnetization of BSM10 suggests a possible
+antiferromagnetic ordering at ~ 260 K. We, therefore, attribute the phonon
+anomaly to spin-phonon coupling arising due to the magnetic ordering.",2110.13808v1
+2021-11-07,Unraveling complex magnetism in two-dimensional FeS$_2$,"Atomically thin two dimensional magnets have given rise to emergent phenomena
+due to magnetic exchange and spin-orbit coupling showing a great promise for
+realizing ultrathin device structures. In this paper, we critically examine the
+magnetic properties of 2D FeS$_2$, which has been recently claimed to exhibit
+room temperature ferromagnetism in the (111) orientation. Our ab initio study
+based on collinear density functional theory has revealed the ground state as
+an antiferromagnetic one with an ordering temperature of around 100K along with
+a signature of spin-phonon coupling, which may trigger a ferromagnetic coupling
+via strain. Moreover, our calculations based on spin-spirals indicate the
+possibility of non-collinear magnetic structures, which is also supported by
+Monte Carlo simulations based on ab initio magnetic exchange parameters. This
+opens up an excellent possibility to manipulate magnetic structures by the
+application of directional strain.",2111.04128v1
+2024-03-21,Shadows and Properties of Spin-Induced Scalarized Black Holes with and without a Ricci Coupling,"In this work, we explore the properties and shadows of spin-induced
+scalarized black holes, as well as investigate how a Ricci coupling influences
+them. Our findings reveal significant deviations from the Kerr metric in terms
+of the location and geodesic frequencies of the innermost stable circular orbit
+and light ring, with the former exhibiting more pronounced disparities. The
+shadows of scalarized black holes exhibit relatively minor deviations when
+compared to those of Kerr black holes with the same mass and spin. Overall, the
+presence of a Ricci coupling is observed to mitigate deviations from the Kerr
+metric.",2403.14596v1
+2007-04-03,Evolution of the Carter constant for inspirals into a black hole: effect of the black hole quadrupole,"We analyze the effect of gravitational radiation reaction on generic orbits
+around a body with an axisymmetric mass quadrupole moment Q to linear order in
+Q, to the leading post-Newtonian order, and to linear order in the mass ratio.
+This system admits three constants of the motion in absence of radiation
+reaction: energy, angular momentum, and a third constant analogous to the
+Carter constant. We compute instantaneous and time-averaged rates of change of
+these three constants. For a point particle orbiting a black hole, Ryan has
+computed the leading order evolution of the orbit's Carter constant, which is
+linear in the spin. Our result, when combined with an interaction quadratic in
+the spin (the coupling of the black hole's spin to its own radiation reaction
+field), gives the next to leading order evolution. The effect of the
+quadrupole, like that of the linear spin term, is to circularize eccentric
+orbits and to drive the orbital plane towards antialignment with the symmetry
+axis. In addition we consider a system of two point masses where one body has a
+single mass multipole or current multipole. To linear order in the mass ratio,
+to linear order in the multipole, and to the leading post-Newtonian order, we
+show that there does not exist an analog of the Carter constant for such a
+system (except for the cases of spin and mass quadrupole). With mild additional
+assumptions, this result falsifies the conjecture that all vacuum, axisymmetric
+spacetimes posess a third constant of geodesic motion.",0704.0389v8
+2017-11-14,Strong spin-orbit coupling and magnetism in (111) (La$_{0.3}$Sr$_{0.7}$)(Al$_{0.65}$Ta$_{0.35})$/SrTiO$_3$,"Strong correlations, multiple lattice degrees of freedom, and the ease of
+doping make complex oxides a source of great research interest. Complex oxide
+heterointerfaces break inversion symmetry and can host a two dimensional
+carrier gas, which can display a variety of coexisting and competing phenomena.
+In the case of heterointerfaces based on SrTiO$_3$, many of these phenomena can
+be effectively tuned by using an electric gate, due to the large dielectric
+constant of SrTiO$_3$. Most studies so far have focused on (001) oriented
+heterostructures; however, (111) oriented heterostructures have recently gained
+attention due to the possibility of finding exotic physics in these systems due
+their hexagonal surface crystal symmetry. In this work, we use
+magnetoresistance to study the evolution of spin-orbit interaction and
+magnetism in a new system, (111) oriented
+(La$_{0.3}$Sr$_{0.7}$)(Al$_{0.65}$Ta$_{0.35}$)/SrTiO$_3$. At more positive
+values of the gate voltage, which correspond to high carrier densities, we find
+that transport is multiband, and dominated by high mobility carriers with a
+tendency towards weak localization. At more negative gate voltages, the carrier
+density is reduced, the high mobility bands are depopulated, and weak
+antilocalization effects begin to dominate, indicating that spin-orbit
+interaction becomes stronger. At millikelvin temperatures, and gate voltages
+corresponding to the strong spin-orbit regime, we observe hysteresis in
+magnetoresistance, indicative of ferromagnetism in the system. Our results
+suggest that in the (111)
+(La$_{0.3}$Sr$_{0.7}$)(Al$_{0.65}$Ta$_{0.35}$)/SrTiO$_3$ system, low mobility
+carriers which experience strong spin-orbit interactions participate in
+creating magnetic order in the system.",1711.05322v2
+2021-07-09,Failure to achieve the $J_{eff}$~=~0 state even in nearly isolated Ir$^{5+}$ in Sr$_3$NaIrO$_6$: are iridates enough for realizing true $j$-$j$ coupling?,"Spin-orbit coupling (SOC) often gives rise to interesting electronic and
+magnetic phases in an otherwise ordinary pool of paramagnetic heavy metal
+oxides. In presence of strong SOC, assumed to be working in $j$-$j$ coupling
+regime, 5$d^4$ iridates are generally speculated to possess a nonmagnetic
+$J_{eff}$~=~0 singlet ground state, which invariably gets masked due to
+different solid-state effects (e.g. hopping). Here, we try to probe the
+trueness of the atomic SOC-based proposal in an apparently 1-dimensional
+system, Sr$_3$NaIrO$_6$, possessing a 2$H$ hexagonal structure with well
+separated Ir$^{5+}$ (5$d^4$) ions. But all the detailed experimental as well as
+theoretical characterizations reveal that the ground state of Sr$_3$NaIrO$_6$
+is not nonmagnetic, rather accommodating a significantly high effective
+magnetic moment on Ir$^{5+}$ ion. However our combined dc susceptibility
+($\chi$), ${}^{23}$Na nuclear magnetic resonance (NMR),
+muon-spin-relaxation/rotation ($\mu$SR) and heat capacity ($C_p$) measurements
+clearly refute any sign of spin-freezing or ordered magnetism among the
+Ir$^{5+}$ moments due to geometrical exchange frustration, while in-depth
+zero-field (ZF) and longitudinal field (LF) $\mu$SR investigations strongly
+point towards inhomogeneous quantum spin-orbital liquid (QSOL)-like ground
+state. In addition, the linear temperature dependence of both the NMR
+spin-lattice relaxation rate and the magnetic heat capacity at low temperatures
+suggest low-lying gapless spin excitations in the QSOL phase of this material.
+Finally, we conclude that the effective SOC realised in $d^4$ iridates are
+unlikely to offer a ground state which will be consistent with a purely atomic
+$j$-$j$ coupling description.",2107.04431v1
+2011-12-01,Measuring nonadiabaticity of molecular quantum dynamics with quantum fidelity and with its efficient semiclassical approximation,"We propose to measure nonadiabaticity of molecular quantum dynamics
+rigorously with the quantum fidelity between the Born-Oppenheimer and fully
+nonadiabatic dynamics. It is shown that this measure of nonadiabaticity applies
+in situations where other criteria, such as the energy gap criterion or the
+extent of population transfer, fail. We further propose to estimate this
+quantum fidelity efficiently with a generalization of the dephasing
+representation to multiple surfaces. Two variants of the multiple-surface
+dephasing representation (MSDR) are introduced, in which the nuclei are
+propagated either with the fewest-switches surface hopping (FSSH) or with the
+locally mean field dynamics (LMFD). The LMFD can be interpreted as the
+Ehrenfest dynamics of an ensemble of nuclear trajectories, and has been used
+previously in the nonadiabatic semiclassical initial value representation. In
+addition to propagating an ensemble of classical trajectories, the MSDR
+requires evaluating nonadiabatic couplings and solving the Schr\""{o}dinger (or
+more generally, the quantum Liouville-von Neumann) equation for a single
+discrete degree of freedom. The MSDR can be also used to measure the importance
+of other terms present in the molecular Hamiltonian, such as diabatic
+couplings, spin-orbit couplings, or couplings to external fields, and to
+evaluate the accuracy of quantum dynamics with an approximate nonadiabatic
+Hamiltonian. The method is tested on three model problems introduced by Tully,
+on a two-surface model of dissociation of NaI, and a three-surface model
+including spin-orbit interactions. An example is presented that demonstrates
+the importance of often-neglected second-order nonadiabatic couplings.",1112.0258v1
+2023-09-21,Ferromagnetic quantum critical point in a locally noncentrosymmetric and nonsymmorphic Kondo metal,"Quantum critical points (QCPs), zero-temperature phase transitions, are
+windows to fundamental quantum-mechanical phenomena associated with universal
+behaviour and can provide parallels to the physics of black holes. Magnetic
+QCPs have been extensively investigated in the vicinity of antiferromagnetic
+order. However, QCPs are rare in metallic ferromagnets due to the coupling of
+the order parameter to electronic soft modes [1,2]. Recently, antisymmetric
+spin-orbit coupling in noncentrosymmetric systems was suggested to protect
+ferromagnetic QCPs [3]. Nonetheless, multiple centrosymmetric materials host FM
+QCPs, suggesting a more general mechanism behind their protection. In this
+context, CeSi$_{2-\delta}$, a dense Kondo lattice crystallising in a
+centrosymmetric structure, exhibits ferromagnetic order when Si is replaced
+with Ag. We report that the Ag-substitution controls the strength of the Kondo
+coupling, leading to a transition between paramagnetic and ferromagnetic Kondo
+phases. Remarkably, a ferromagnetic QCP accompanied by concurrent strange-metal
+behaviour emerges. Herein, we suggest that, despite the centrosymmetric
+structure, spin-orbit coupling arising from the local noncentrosymmetric
+structure, in combination with nonsymmorphic symmetry, can protect
+ferromagnetic QCPs. Our findings present a unique example of Kondo
+coupling-driven ferromagnetic QCP through chemical doping and offer a general
+guideline for discovering new ferromagnetic QCPs.",2309.12497v1
+2020-01-14,Anisotropic superconductivity mediated by ferroelectric fluctuations in cubic systems with spin-orbit coupling,"Motivated by the experimental observation that superconductivity in bulk
+doped SrTiO$_{3}$ is enhanced as a putative ferroelectric quantum critical
+point (FE-QCP) is approached, we study the pairing instability of a cubic
+system in which electrons exchange low-energy ferroelectric fluctuations.
+Instead of the gradient coupling to the lattice distortion associated with
+ferroelectricity, we consider a direct coupling between the electrons and the
+bosonic ferroelectric field that appears in the presence of spin-orbit
+coupling. Working in the weak-coupling regime, we find that the pairing
+interaction is dominated by the soft transverse optical (TO) mode, resulting in
+a $T_{c}$ enhancement upon approaching the FE-QCP. Focusing on even-parity
+states, we find that although the $s$-wave state always wins, states with
+higher Cooper-pair angular momentum become close competitors as the TO mode
+softens. We show that the cubic anisotropy of the FE fluctuations mixes the
+$s$-wave and $g$-wave states, resulting in a characteristic anisotropy of the
+gap function. The gap anisotropy behaves non-monotonically as the FE-QCP is
+approached: upon decreasing the TO mode frequency, the gap anisotropy first
+changes sign and then increases in magnitude. We discuss the possible
+applications of our results to the superconducting state of SrTiO$_{3}$.",2001.04919v1
+2022-01-01,"Kondo effect in a non-Hermitian, $\mathcal{PT}$-symmetric Anderson model with Rashba spin-orbit coupling","The non-interacting and non-Hermitian, parity-time ($\mathcal{PT}$)-symmetric
+Anderson model exhibits an exceptional point (EP) at a non-Hermitian coupling
+$g=1$, which remains unrenormalized in the presence of interactions (Lourenco
+et al, arXiv:1806.03116), where the EP was shown to coincide with the quantum
+critical point (QCP) for Kondo destruction. In this work, we consider a quantum
+dot hybridizing with metallic leads having Rashba spin-orbit coupling
+($\lambda$). We show that for a non-Hermitian hybridization, $\lambda$ can
+renormalize the exceptional point even in the non-interacting case, stabilizing
+$\mathcal{PT}$-symmetry beyond $g=1$. Through exact diagonalization of a
+zero-bandwidth, three-site model, we show that the quantum critical point and
+the exceptional point bifurcate, with the critical point for Kondo destruction
+at $g_c=1$, and the exceptional coupling being $g_{\scriptscriptstyle{EP}} > 1$
+for all $U\neq 0$ and $\lambda\geq 0; \lambda\neq U/2$. On the line
+$\lambda=U/2$, the critical point and the EP again coincide at
+$g_c=g_{\scriptscriptstyle{EP}}=1$. The full model with finite bandwidth leads
+is investigated through the slave-boson approach, using which we show that, in
+the strong coupling regime, $\lambda$ and interactions co-operate in strongly
+reducing the critical point associated with Kondo destruction, below the
+$\lambda=0$ value.",2201.00175v3
+2012-12-19,Emergent Nesting of the Fermi Surface from Local-Moment Description of Iron-Pnictide High-Tc Superconductors,"We uncover the low-energy spectrum of a t-J model for electrons on a square
+lattice of spin-1 iron atoms with 3dxz and 3dyz orbital character by applying
+Schwinger-boson-slave-fermion mean-field theory and by exact diagonalization of
+one hole roaming over a 4 x 4 x 2 lattice. Hopping matrix elements are set to
+produce hole bands centered at zero two-dimensional (2D) momentum in the
+free-electron limit. Holes can propagate coherently in the t-J model below a
+threshold Hund coupling when long-range antiferromagnetic order across the d+ =
+3d(x+iy)z and d- = 3d(x-iy)z orbitals is established by magnetic frustration
+that is off-diagonal in the orbital indices. This leads to two hole-pocket
+Fermi surfaces centered at zero 2D momentum. Proximity to a commensurate
+spin-density wave (cSDW) that exists above the threshold Hund coupling results
+in emergent Fermi surface pockets about cSDW momenta at a quantum critical
+point (QCP). This motivates the introduction of a new Gutzwiller wavefunction
+for a cSDW metal state. Study of the spin-fluctuation spectrum at cSDW momenta
+indicates that the dispersion of the nested band of one-particle states that
+emerges is electron-type. Increasing Hund coupling past the QCP can push the
+hole-pocket Fermi surfaces centered at zero 2D momentum below the Fermi energy
+level, in agreement with recent determinations of the electronic structure of
+mono-layer iron-selenide superconductors.",1212.4619v3
+2019-11-01,Ground-state phase diagram and excitation spectrum of a Bose-Einstein condensate with spin-orbital-angular-momentum coupling,"We investigate the ground-state phase diagram and excitation spectrum of an
+interacting spinor Bose-Einstein condensate with spin-orbital-angular-momentum
+(SOAM) coupling realized in recent experiments by introducing atomic Raman
+transition with a pair of copropagating Laguerre-Gaussian laser beams that
+carry different orbital angular momenta (OAM) [Chen et al., Phys. Rev. Lett.
+121, 113204 (2018) and Zhang et al., Phys. Rev. Lett. 122, 110402 (2019)].
+Because of the ground-state degeneracy of the single-particle Hamiltonian at
+vanishing detuning, several angular-stripe phases, which are superposition of
+states with different angular quantum numbers, appear in the phase diagram.
+However, these phases normally exist at small detuning, which makes them hard
+to be probed in experiments. We show that for a large OAM difference of the
+laser beams, an asymmetric kind of angular-stripe phase can exist even at large
+detuning. The excitation spectra in different phases exhibit distinct features:
+In the angular-stripe phase there exist two gapless bands corresponding to the
+broken U(1) and rotational symmetries, while in the half-skyrmion phase the
+gapless band exhibits a roton-like structure. Our predictions of the
+angular-stripe phases and the low-energy excitations can be examined in
+recently realized BECs with SOAM coupling.",1911.00255v3
+2016-12-15,Covalency and vibronic couplings make a nonmagnetic j=3/2 ion magnetic,"For 4$d^1$ and 5$d^1$ spin-orbit-coupled electron configurations, the notion
+of nonmagnetic j=3/2 quartet ground state discussed in classical textbooks is
+at odds with the observed variety of magnetic properties. Here we throw fresh
+light on the electronic structure of 4$d^1$ and 5$d^1$ ions in molybdenum- and
+osmium-based double-perovskite systems and reveal different kinds of on-site
+many-body physics in the two families of compounds: while the sizable magnetic
+moments and $g$ factors measured experimentally are due to both metal
+$d$-ligand $p$ hybridization and dynamic Jahn-Teller interactions for 4$d$
+electrons, it is essentially $d$-$p$ covalency for the 5$d^1$ configuration.
+These results highlight the subtle interplay of spin-orbit interactions,
+covalency and electron-lattice couplings as the major factor in deciding the
+nature of the magnetic ground states of 4$d$ and 5$d$ quantum materials. Cation
+charge imbalance in the double-perovskite structure is further shown to allow a
+fine tuning of the gap between the $t_{2g}$ and $e_g$ levels, an effect of much
+potential in the context of orbital engineering in oxide electronics.",1612.05158v1
+2020-01-09,Bismuth iron garnet: ab initio study of electronic properties,"Bismuth iron garnet (BIG), i.e. Bi3Fe5O12, is a strong ferrimagnet that also
+possess outstanding magneto-optical properties such as the largest known
+Faraday rotation. These properties are related with the distribution of
+magnetic moments on octahedral and tetrahedral sites, the presence of spin gaps
+in the density of state and a strong spin-orbit coupling. In this work,
+first-principles ab initio calculations are performed to study the structural,
+electronic and magnetic properties of BIG using Density Functional Theory with
+Hubbard+U (DFT+U) correction including spin-orbit coupling and HSE06 hybrid
+functional. We found that the presence of spin gaps in the electronic structure
+results from the interplay between exchange and correlation effects and the
+crystal field strengths for tetrahedral and octahedral iron sublattices. The
+DFT+U treatment tends to close the spin-gaps for larger U due to
+over-localization effects, notably in the octahedral site. On the other hand,
+the hybrid functional confirms the occurrences of three spin gaps in the iron
+states of the conduction band as expected from optical measurements. A strong
+exchange splitting at the top of the valence bands associated with a lone-pair
+type mixture of O p and Bi s,p states is also obtained. Similar exchange
+splitting was not previously observed for other iron based garnets, such as for
+yttrium iron garnet. It follows that hole doping, as obtained by Ca
+substitution at Bi sites, results in a full spin polarized density at the Fermi
+energy. This work helps to shed more light on the theoretical comprehension of
+the properties of BIG and opens the route towards the use of advanced Many Body
+calculations to predict the magneto-optical coupling effects in BIG in a direct
+comparison with the experimental measurements.",2001.02910v1
+2019-02-20,Optical valley Hall effect for highly valley-coherent exciton-polaritons in an atomically thin semiconductor,"Spin-orbit coupling is a fundamental mechanism that connects the spin of a
+charge carrier with its momentum. Likewise, in the optical domain, a synthetic
+spin-orbit coupling is accessible, for instance, by engineering optical
+anisotropies in photonic materials. Both, akin, yield the possibility to create
+devices directly harnessing spin- and polarization as information carriers.
+Atomically thin layers of transition metal dichalcogenides provide a new
+material platform which promises intrinsic spin-valley Hall features both for
+free carriers, two-particle excitations (excitons), as well as for photons. In
+such materials, the spin of an exciton is closely linked to the high-symmetry
+point in reciprocal space it emerges from. Here, we demonstrate, that spin, and
+hence valley selective propagation is accessible in an atomically thin layer of
+MoSe2, which is strongly coupled to a microcavity photon mode. We engineer a
+wire-like device, where we can clearly trace the flow, and the helicity of
+exciton-polaritons expanding along a channel. By exciting a coherent
+superposition of K and K- tagged polaritons, we observe valley selective
+expansion of the polariton cloud without neither any applied external magnetic
+fields nor coherent Rayleigh scattering. Unlike the valley Hall effect for TMDC
+excitons, the observed optical valley Hall effect (OVHE) strikingly occurs on a
+macroscopic scale, and clearly reveals the potential for applications in
+spin-valley locked photonic devices.",1902.07620v1
+2022-03-31,First-principles theory of intrinsic spin and orbital Hall and Nernst effects in metallic monoatomic crystals,"The generation of spin and orbital currents is of crucial importance in the
+field of spin-orbitronics. In this work, using relativistic density functional
+theory and the Kubo linear-response formalism, we systematically investigate
+the spin Hall and orbital Hall effects for 40 monoatomic metals. The spin Hall
+conductivity (SHC) and orbital Hall conductivity (OHC) are computed as a
+function of the electrochemical potential and the influence of the spin-orbit
+interaction strength is also investigated. Our calculations predict a rather
+small OHC in $sp$ metals, but a much larger OHC in $d$-band metals, with
+maximum values [$\sim 8000\,(\hbar/e)\Omega^{-1}{\rm cm}^{-1}$] near the middle
+of the $d$ series. Using the Mott formula, we evaluate the thermal counterparts
+of the spin and orbital Hall effects, the spin Nernst effect (SNE) and the
+orbital Nernst effect (ONE). We find that the as-yet unobserved ONE is
+significantly larger ($\sim 10 \times$) than the SNE and has maximum values for
+group 10 elements (Ni, Pd, and Pt). Our work provides a broad overview of
+electrically- and thermally-induced spin and orbital transport in monoatomic
+metals.",2203.17037v1
+2023-03-29,Asymptotic gravitational-wave fluxes from a spinning test body on generic orbits around a Kerr black hole,"This work provides gravitational wave energy and angular momentum asymptotic
+fluxes from a spinning body moving on generic orbits in a Kerr spacetime up to
+linear in spin approximation. To achieve this, we have developed a new
+frequency domain Teukolsky equation solver that calculates asymptotic
+amplitudes from generic orbits of spinning bodies with their spin aligned with
+the total orbital angular momentum. However, the energy and angular momentum
+fluxes from these orbits in the linear in spin approximation are appropriate
+for adiabatic models of extreme mass ratio inspirals even for spins non-aligned
+to the orbital angular momentum. To check the newly obtained fluxes, they were
+compared with already known frequency domain results for equatorial orbits and
+with results from a time domain Teukolsky equation solver called Teukode for
+off-equatorial orbits. The spinning body framework of our work is based on the
+Mathisson-Papapetrou-Dixon equations under the Tulczyjew-Dixon spin
+supplementary condition.",2303.16798v1
+2017-09-03,Optical properties of van der Waals heterostructure of uniaxially strained graphene on TMD,"The spin and valley polarizations and plasmonics in Van der Waals
+heterostructures of strained graphene monolayer on 2D transition metal
+dichalcogenide (GrTMD) substrate are reported in this communication. The
+substrate induced interactions (SII) involve sub-lattice-resolved, and enhanced
+intrinsic spin-orbit couplings, the extrinsic Rashba spin-orbit coupling
+(RSOC), and the orbital gap related to the transfer of the electronic charge
+from graphene to the substrate. Furthermore, magnetic impurity atoms are
+deposited to the graphene surface and the corresponding exchange field is
+included in the band dispersion. A Rashba coupling dependent pseudo Zeeman term
+arising due to the interplay of SIIs was found to be responsible for the spin
+degeneracy lifting and the spin polarization. The latter turns out to be
+electrostatic doping and the exchange field tunable and inversely proportional
+to the square root of the carrier concentration. The strain field, on the other
+hand, brings about the valley polarization. The intra-band plasmon dispersion
+for the finite doping and the long wavelength limit has also been obtained. The
+dispersion involves the q2/3 behavior and not the well known q1/2 behavior. The
+uniform, uniaxial strain does not bring about any change in this behavior.
+However, the plasmon dispersion gets steeper for the wavevector perpendicular
+to the direction of strain and is flattened for wave vectors along the
+direction of the strain with the term responsible for the flattening
+proportional to the strain field. The stronger confinement capability of GrTMD
+Plasmon compared to that of standalone, doped graphene is an important outcome
+of the present work. One finds that whereas the intra-band absorbance of GrTMD
+is decreasing function of the frequency at a given strain field, it is an
+increasing function of the strain field at a given frequency.",1709.00667v1
+2018-10-22,Tuning a binary ferromagnet into a multi-state synapse with spin-orbit torque induced plasticity,"Inspired by ion-dominated synaptic plasticity in human brain, artificial
+synapses for neuromorphic computing adopt charge-related quantities as their
+weights. Despite the existing charge derived synaptic emulations, schemes of
+controlling electron spins in ferromagnetic devices have also attracted
+considerable interest due to their advantages of low energy consumption,
+unlimited endurance, and favorable CMOS compatibility. However, a generally
+applicable method of tuning a binary ferromagnet into a multi-state memory with
+pure spin-dominated synaptic plasticity in the absence of an external magnetic
+field is still missing. Here, we show how synaptic plasticity of a
+perpendicular ferromagnetic FM1 layer can be obtained when it is
+interlayer-exchange-coupled by another in-plane ferromagnetic FM2 layer, where
+a magnetic-field-free current-driven multi-state magnetization switching of FM1
+in the Pt/FM1/Ta/FM2 structure is induced by spin-orbit torque. We use current
+pulses to set the perpendicular magnetization state which acts as the synapse
+weight, and demonstrate spintronic implementation of the excitatory/inhibitory
+postsynaptic potentials and spike timing-dependent plasticity. This
+functionality is made possible by the action of the in-plane interlayer
+exchange coupling field which leads to broadened, multi-state magnetic reversal
+characteristics. Numerical simulations, combined with investigations of a
+reference sample with a single perpendicular magnetized Pt/FM1/Ta structure,
+reveal that the broadening is due to the in-plane field component tuning the
+efficiency of the spin-orbit-torque to drive domain walls across a landscape of
+varying pinning potentials. The conventionally binary FM1 inside our
+Pt/FM1/Ta/FM2 structure with inherent in-plane coupling field is therefore
+tuned into a multi-state perpendicular ferromagnet and represents a synaptic
+emulator for neuromorphic computing.",1810.09064v1
+2006-05-27,Higher-order spin effects in the dynamics of compact binaries II. Radiation field,"Motivated by the search for gravitational waves emitted by binary black
+holes, we investigate the gravitational radiation field of point particles with
+spins within the framework of the multipolar-post-Newtonian wave generation
+formalism. We compute: (i) the spin-orbit (SO) coupling effects in the binary's
+mass and current quadrupole moments one post-Newtonian (1PN) order beyond the
+dominant effect, (ii) the SO contributions in the gravitational-wave energy
+flux and (iii) the secular evolution of the binary's orbital phase up to 2.5PN
+order. Crucial ingredients for obtaining the 2.5PN contribution in the orbital
+phase are the binary's energy and the spin precession equations, derived in
+paper I of this series. These results provide more accurate gravitational-wave
+templates to be used in the data analysis of rapidly rotating Kerr-type
+black-hole binaries with the ground-based detectors LIGO, Virgo, GEO 600 and
+TAMA300, and the space-based detector LISA.",0605140v4
+2011-03-04,Chiral orbital-angular-momentum in the surface states of Bi2Se3,"Locking of the spin of a quasi-particle to its momentum in split bands of on
+the surfaces of metals and topological insulators (TIs) is understood in terms
+of Rashba effect where a free electron in the surface states feels an effective
+magnetic field. On the other hand, the orbital part of the angular momentum
+(OAM) is usually neglected. We performed angle resolved photoemission
+experiments with circularly polarized lights and first principles density
+functional calculation with spin-orbit coupling on a TI, Bi2Se3, to study the
+local OAM of the surface states. We show from the results that OAM in the
+surface states of Bi2Se3 is significant and locked to the electron momentum in
+opposite direction to the spin, forming chiral OAM states. Our finding opens a
+new possibility to have strong light-induced spin-polarized current in the
+surface states.",1103.0805v2
+2015-06-18,The absence of intraband scattering in a consistent theory of Gilbert damping in metallic ferromagnets,"Damping of magnetization dynamics in a ferromagnetic metal is usually
+characterized by the Gilbert parameter alpha. Recent calculations of this
+quantity, using a formula due to Kambersky, find that it is infinite for a
+perfect crystal owing to an intraband scattering term which is of third order
+in the spin-orbit parameter xi This surprising result conflicts with recent
+work by Costa and Muniz who study damping numerically by direct calculation of
+the dynamical transverse spin susceptibility in the presence of spin-orbit
+coupling. We resolve this inconsistency by following the Costa-Muniz approach
+for a slightly simplified model where it is possible to calculate alpha
+analytically. We show that to second order in the spin-orbit parameter xi one
+retrieves the Kambersky result for alpha, but to higher order one does not
+obtain any divergent intraband terms. The present work goes beyond that of
+Costa and Muniz by pointing out the necessity of including the effect of
+long-range Coulomb interaction in calculating damping for large xi. A direct
+derivation of the Kambersky formula is given which shows clearly the
+restriction of its validity to second order in xi so that no intraband
+scattering terms appear. This restriction has an important effect on the
+damping over a substantial range of impurity content and temperature. The
+experimental situation is discussed.",1506.05622v2
+2016-06-07,"Fermi level position, Coulomb gap, and Dresselhaus splitting in (Ga,Mn)As","Carrier-induced nature of ferromagnetism in a ferromagnetic semiconductor,
+(Ga,Mn)As, offers a great opportunity to observe novel spin-related phenomena
+as well as to demonstrate new functionalities of spintronic devices. Here, we
+report on low-temperature angle-resolved photoemission studies of the valence
+band in this model compound. By a direct determination of the distance of the
+split-off band to the Fermi energy EF, we conclude that EF is located within
+the heavy/light hole band. However, the bands are strongly perturbed by
+disorder and disorder-induced carrier correlations that lead to the Coulomb gap
+at EF, which we resolve experimentally in a series of samples, and show that
+its depth and width enlarge when the Curie temperature decreases. Furthermore,
+we have detected surprising linear magnetic dichroism in photoemission spectra
+of the split-off band. By a quantitative theoretical analysis we demonstrate
+that it arises from the Dresselhaus-type spin-orbit term in zinc-blende
+crystals. The spectroscopic access to the magnitude of such asymmetric part of
+spin-orbit coupling is worthwhile, as they account for spin-orbit torque in
+spintronic devices of ferromagnets without inversion symmetry.",1606.02047v1
+2017-03-29,Driving force of the orbital-relevant electronic nematicity in Fe-based superconductors,"The electronic nematic responses in Fe-based superconductors have been
+observed ubiquitously in various experimental probes. One novel nematic
+character is the d-wave {\it bond} orbital-relevant nematic charge order which
+was firstly proposed by symmetry analysis and then conformed by angle-resolved
+photoemission spectroscopy. In this paper, we present a mechanism that the
+driving force of the orbital-relevant nematic charge order is the reduction of
+the large Hubbard energy in the particle-hole charge channel by virtual hopping
+processes. This is one scenario from strong-coupling consideration. The same
+virtual hopping processes can lead to a super-exchange interaction for the spin
+magnetic order in the particle-hole spin channel and a pairing interaction for
+the superconducting order in the particle-particle channel. Thus the electronic
+nematic order, the spin magnetic order and the pairing superconducting order
+are intrinsically entangled and they can all stem from the same microscopic
+virtual hopping processes in reduction of the Hubbard energy. The electronic
+nematicity, the spin magnetism and the pairing superconductivity in
+unconventional superconductors are proposed to be unified within this
+mechanism.",1703.09841v3
+2017-06-19,Investigation of the Dzyaloshinskii-Moriya interaction and room temperature skyrmions in W/CoFeB/MgO thin films and microwires,"Recent studies have shown that material structures, which lack structural
+inversion symmetry and have high spin-orbit coupling can exhibit chiral
+magnetic textures and skyrmions which could be a key component for next
+generation storage devices. The Dzyaloshinskii-Moriya Interaction (DMI) that
+stabilizes skyrmions is an anti-symmetric exchange interaction favoring
+non-collinear orientation of neighboring spins. It has been shown that material
+systems with high DMI can lead to very efficient domain wall and skyrmion
+motion by spin-orbit torques. To engineer such devices, it is important to
+quantify the DMI for a given material system. Here we extract the DMI at the
+Heavy Metal (HM) /Ferromagnet (FM) interface using two complementary
+measurement schemes namely asymmetric domain wall motion and the magnetic
+stripe annihilation. By using the two different measurement schemes, we find
+for W(5 nm)/Co20Fe60B20(0.6 nm)/MgO(2 nm) the DMI to be 0.68 +/- 0.05 mJ/m2 and
+0.73 +/- 0.5 mJ/m2, respectively. Furthermore, we show that this DMI stabilizes
+skyrmions at room temperature and that there is a strong dependence of the DMI
+on the relative composition of the CoFeB alloy. Finally we optimize the layers
+and the interfaces using different growth conditions and demonstrate that a
+higher deposition rate leads to a more uniform film with reduced pinning and
+skyrmions that can be manipulated by Spin-Orbit Torques.",1706.05987v1
+2017-06-26,The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem,"The $SU(4)-SU(2)$ crossover, driven by an external magnetic field $h$, is
+analyzed in a capacitively-coupled double-quantum-dot device connected to
+independent leads. As one continuously charges the dots from empty to
+quarter-filled, by varying the gate potential $V_g$, the crossover starts when
+the magnitude of the spin polarization of the double quantum dot, as measured
+by $\langle n_{\uparrow}\rangle -\langle n_{\downarrow}\rangle$, becomes
+finite. Although the external magnetic field breaks the $SU(4)$ symmetry of the
+Hamiltonian, the ground state preserves it in a region of $V_g$, where $\langle
+n_{\uparrow}\rangle -\langle n_{\downarrow}\rangle =0$. Once the spin
+polarization becomes finite, it initially increases slowly until a sudden
+change occurs, in which $\langle n_{\downarrow}\rangle$ (polarization direction
+opposite to the magnetic field) reaches a maximum and then decreases to
+negligible values abruptly, at which point an orbital $SU(2)$ ground state is
+fully established. This crossover from one Kondo state, with emergent $SU(4)$
+symmetry, where spin and orbital degrees of freedom all play a role, to
+another, with $SU(2)$ symmetry, where only orbital degrees of freedom
+participate, is triggered by a competition between $g\mu_Bh$, the energy gain
+by the Zeeman-split polarized state and the Kondo temperature $T_K^{SU(4)}$,
+the gain provided by the $SU(4)$ unpolarized Kondo-singlet state.",1706.08618v1
+2020-01-30,Localized spin-orbit polaron in magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$,"The kagome lattice Co$_3$Sn$_2$S$_2$ exhibits the quintessential topological
+phenomena of a magnetic Weyl semimetal such as the chiral anomaly and Fermi-arc
+surface states. Probing its magnetic properties is crucial for understanding
+this correlated topological state. Here, using spin-polarized scanning
+tunneling microscopy/spectroscopy (STM/S), we report the discovery of localized
+spin-orbit polarons (SOPs) with three-fold rotation symmetry nucleated around
+single-S vacancies in Co$_3$Sn$_2$S$_2$. The SOPs carry a spin-polarized
+magnetic moment and a large orbital magnetization of a topological origin
+associated with the Berry phase and the persistent circulating current.
+Appreciable magneto-elastic coupling of the SOP is detected by atomic force
+microscope and STM. Our findings suggest that the SOPs can enhance magnetism
+and stability of the magnetic Weyl nodes for more robust
+time-reversal-symmetry-breaking topological phenomena. Controlled engineering
+of the SOPs may pave the way toward practical applications in functional
+quantum devices.",2001.11295v2
+2020-02-20,Giant anisotropic magnetoresistance through a tilted molecular $π$-orbital,"Anisotropic magnetoresistance (AMR), originating from spin-orbit coupling
+(SOC), is the sensitivity of the electrical resistance in magnetic systems to
+the direction of spin magnetization. Although this phenomenon has been
+experimentally reported for several nanoscale junctions, a clear understanding
+of the physical mechanism behind it is still elusive. Here we discuss a novel
+concept based on orbital symmetry considerations to attain a significant AMR of
+up to 95\% for a broad class of $\pi$-type molecular spin-valves. It is
+illustrated at the benzene-dithiolate molecule connected between two monoatomic
+nickel electrodes. We find that SOC opens, via spin-flip events at the
+ferromagnet-molecule interface, a new conduction channel, which is fully
+blocked by symmetry without SOC. Importantly, the interplay between main and
+new transport channels turns out to depend strongly on the magnetization
+direction in the nickel electrodes due to the tilting of molecular orbital.
+Moreover, due to multi-band quantum interference, appearing at the band edge of
+nickel electrodes, a transmission drop is observed just above the Fermi energy.
+Altogether, these effects lead to a significant AMR around the Fermi level,
+which even changes a sign. Our theoretical understanding, corroborated in terms
+of \textit{ab initio} calculations and simplified analytical models, reveals
+the general principles for an efficient realization of AMR in molecule-based
+spintronic devices.",2002.08678v2
+2020-12-09,Disentangling the role of bond lengths and orbital symmetries in controlling $T_c$ in YBa$_2$Cu$_3$O$_7$,"Optimally doped YBCO (YBa$_{2}$Cu$_{3}$O$_{7}$) has a high critical
+temperature, at 92 K. It is largely believed that Cooper pairs form in YBCO and
+other cuprates because of spin fluctuations, the issue and the detailed
+mechanism is far from settled. In the present work, we employ a
+state-of-the-art \emph{ab initio} ability to compute both the low and high
+energy spin fluctuations in optimally doped YBCO. We benchmark our results
+against recent inelastic neutron scattering and resonant inelastic X-ray
+scattering measurements. Further, we use strain as an external parameter to
+modulate the spin fluctuations and superconductivity. We disentangle the roles
+of Barium-apical Oxygen hybridization, the interlayer coupling and orbital
+symmetries by applying an idealized strain, and also a strain with a fully
+relaxed structure. We show that shortening the distance between Cu layers is
+conducive for enhanced Fermi surface nesting, that increases spin fluctuations
+and drives up $T_{c}$. However, when the structure is fully relaxed electrons
+flow to the d$_{z^2}$ orbital as a consequence of a shortened Ba-O bond which
+is detrimental for superconductivity",2012.04897v1
+2019-12-21,Stacking-configuration-enriched essential properties in bilayer silicenes,"The geometric, electronic and magnetic properties of silicene-related systems
+present the diversified phenomena through the first-principles calculations.
+The critical factors, the group-IV monoelements, buckled/planar structures,
+stacking configurations, layer numbers, and van der Waals interactions of
+bilayer composites are taken into account simultaneously. The developed
+theoretical framework is responsible for the concise physical and chemical
+pictures. The delicate evaluations and analyses are conducted on the optimal
+lattices, the atom- $\&$ spin-dominated energy bands, the atom-, orbital- $\&$
+spin-projected vanHove singularities, and the magnetic moments. Most
+importantly, they achieve the decisive mechanisms, the buckled/planar honeycomb
+lattices, the multi-/single-orbital hybridizations, and the
+significant/negligible spin-orbital couplings. Furthermore, we investigate the
+stacking-configuration-induced dramatic transformations of the essential
+properties by the relative shift in bilayer graphene and silicene. The lattice
+constant, interlayer distance, the buckle height, and the total energy
+essentially depend on the magnitude and direction of the relative shift: AA
+$\rightarrow$ AB $\rightarrow$ AA$^{\prime}$ $\rightarrow$ AA. Apparently,
+sliding bilayer systems are quite different between silicene and graphene in
+terms of electronic properties, strongly depending on the buckled/planar
+honeycomb lattices, the multi-/single-orbital hybridizations, the
+dominant/observable interlayer hopping integrals, and the
+significant/negligible spin interactions. The predicted results can account for
+the up-to-date experimental measurements.",1912.10257v1
+2021-07-06,Relativistic aspects of orbital and magnetic anisotropies in the chemical bonding and structure of lanthanide molecules,"The electronic structure of magnetic lanthanide atoms is fascinating from a
+fundamental perspective. They have electrons in a submerged open 4f shell lying
+beneath a filled 6s shell with strong relativistic correlations leading to a
+large magnetic moment and large electronic orbital angular momentum. This large
+angular momentum leads to strong anisotropies, i. e. orientation dependencies,
+in their mutual interactions. The long-ranged molecular anisotropies are
+crucial for proposals to use ultracold lanthanide atoms in spin-based quantum
+computers, the realization of exotic states in correlated matter, and the
+simulation of orbitronics found in magnetic technologies. Short-ranged
+interactions and bond formation among these atomic species have thus far not
+been well characterized. Efficient relativistic computations are required.
+Here, for the first time we theoretically determine the electronic and
+ro-vibrational states of heavy homonuclear lanthanide Er2 and Tm2 molecules by
+applying state-of-the-art relativistic methods. In spite of the complexity of
+their internal structure, we were able to obtain reliable spin-orbit and
+correlation-induced splittings between the 91 Er2 and 36 Tm2 electronic
+potentials dissociating to two ground-state atoms. A tensor analysis allows us
+to expand the potentials between the atoms in terms of a sum of seven spin-spin
+tensor operators simplifying future research. The strengths of the tensor
+operators as functions of atom separation are presented and relationships among
+the strengths, derived from the dispersive long-range interactions, are
+explained. Finally, low-lying spectroscopically relevant ro-vibrational energy
+levels are computed with coupled-channels calculations and analyzed.",2107.02676v1
+2022-03-27,Giant bulk spin-orbit torque and efficient electrical switching in single ferrimagnetic FeTb layers with strong perpendicular magnetic anisotropy,"Efficient manipulation of antiferromagnetically coupled materials that are
+integration-friendly and have strong perpendicular magnetic anisotropy (PMA) is
+of great interest for low-power, fast, dense magnetic storage and computing.
+Here, we report a distinct, giant bulk damping-like spin-orbit torque in
+strong-PMA ferrimagnetic Fe100-xTbx single layers that are integration-friendly
+(composition-uniform, amorphous, sputter-deposited). For sufficiently-thick
+layers, this bulk torque is constant in the efficiency per unit layer
+thickness, {\xi}_DL^j/t, with a record-high value of 0.036nm-1, and the
+dampinglike torque efficiency {\xi}_DL^j achieves very large values for thick
+layers, up to 300% for 90 nm layers. This giant bulk torque by itself switches
+tens of nm thick Fe100-xTbx layers that have very strong PMA and high
+coercivity at current densities as low as a few MA/cm2. Surprisingly, for a
+given layer thickness, {\xi}_DL^j shows strong composition dependence and
+becomes negative for composition where the total angular momentum is oriented
+parallel to the magnetization rather than antiparallel. Our findings of giant
+bulk spin torque efficiency and intriguing torque-compensation correlation will
+stimulate study of such unique spin-orbit phenomena in a variety of
+ferrimagnetic hosts. This work paves a promising avenue for developing
+ultralow-power, fast, dense ferrimagnetic storage and computing devices.",2203.14193v1
+2006-10-24,Non-dissipative tidal synchronization in accreting binary white dwarf systems,"We study a non-dissipative hydrodynamical mechanism that can stabilize the
+spin of the accretor in an ultra-compact double white dwarf binary. This novel
+synchronization mechanism relies on a nonlinear wave interaction spinning down
+the background star. The essential physics of the synchronization mechanism is
+summarized as follows. As the compact binary coalesces due to gravitational
+wave emission, the largest star eventually fills its Roche lobe and accretion
+starts. The accretor then spins up due to infalling material and eventually
+reaches a spin frequency where a normal mode of the star is resonantly driven
+by the gravitational tidal field of the companion. If the resonating mode
+satisfies a set of specific criteria, which we elucidate in this paper, it
+exchanges angular momentum with the background star at a rate such that the
+spin of the accretor locks at this resonant frequency, even though accretion is
+ongoing. Some of the accreted angular momentum that would otherwise spin up the
+accretor is fed back into the orbit through this resonant tidal interaction.
+  Two modes capable of stabilizing the accretor's spin are the l=4,m=2 and
+l=5,m=3 CFS unstable hybrid r-modes, which stabilize the spin of the accretor
+at frequency 2.6 and 1.5 times the binary's orbital frequency respectively.
+Since the stabilization mechanism relies on continuously driving a mode at
+resonance, its lifetime is limited since eventually the mode amplitude
+saturates due to non-linear mode-mode coupling. Rough estimates of the lifetime
+of the effect lie from a few orbits to millions of years.",0610692v2
+2014-02-05,Spin Transfer Torque Generated by the Topological Insulator Bi_2Se_3,"Magnetic devices are a leading contender for implementing memory and logic
+technologies that are nonvolatile, that can scale to high density and high
+speed, and that do not suffer wear-out. However, widespread applications of
+magnetic memory and logic devices will require the development of efficient
+mechanisms for reorienting their magnetization using the least possible current
+and power. There has been considerable recent progress in this effort, in
+particular discoveries that spin-orbit interactions in heavy metal/ferromagnet
+bilayers can yield strong current-driven torques on the magnetic layer, via the
+spin Hall effect in the heavy metal or the Rashba-Edelstein effect in the
+ferromagnet. As part of the search for materials to provide even more efficient
+spin-orbit-induced torques, some proposals have suggested topological
+insulators (TIs), which possess a surface state in which the effects of
+spin-orbit coupling are maximal in the sense that an electron's spin
+orientation is locked relative to its propagation direction. Here we report
+experiments showing that charge current flowing in-plane in a thin film of the
+TI Bi_2Se_3 at room temperature can indeed apply a strong spin-transfer torque
+to an adjacent ferromagnetic permalloy (Py = Ni81Fe19) thin film, with a
+direction consistent with that expected from the topological surface state. We
+find that the strength of the torque per unit charge current density in the
+Bi_2Se_3 is greater than for any other spin-torque source material measured to
+date, even for non-ideal TI films wherein the surface states coexist with bulk
+conduction. Our data suggest that TIs have potential to enable very efficient
+electrical manipulation of magnetic materials at room temperature for memory
+and logic applications.",1402.1124v1
+2016-05-30,On the Coupling of Photon Spin to Electron Orbital Angular Momentum,"Partially gold coated 90 degree glass wedges and a semi - infinite slit in a
+thin film of gold ending in a conducting nano-junction serve as samples to
+investigate the transfer of photon spin to electron orbital angular momentum.
+These structures were specifically designed as samples where an incident beam
+of light is retroreflected. Since in the process of retroreflection the turning
+sense of a circularly polarized beam of light does not change and the direction
+of propagation is inverted, the photon spin is inverted. Due to conservation of
+angular momentum a transfer of photon spin to electron orbital angular momentum
+of conduction electrons occurs. In the structures a circular movement of
+electrons is blocked and therefore the transfered spin can be detected as a
+photovoltage due to an electromotive force which is induced by the transfer of
+angular momentum. Depending on the polarization of the incident beam, a maximum
+photovoltage of about 0,2 micro V was measured for both structures. The results
+are interpreted in terms of a classical electrodynamic model of the
+monochromatic linearly polarized photon as a propagating solitary
+electromagnetic wave of finite energy hf which carries an angular momentum
+h/2pi which is elaborated elsewhere where h is Plancks constant and f the
+frequency of light. The relative values of the measured photovoltages for
+different polarizations can well be explained by the electrodynamic model of a
+photon and an associated spin angular momentum. The absolute values of the
+measured photovoltages are also consistent with the interpretation. The
+observed effects are closely related to the lateral Fedorov Imbert shift of
+focused beams in optics and the optical spin Hall effect and to other non
+linear optical effects such as the inverse faraday effect for which a new
+interpretation is given here in terms of the electrodynamic model of the photon
+and its spin.",1609.05218v1
+2020-02-06,Spin-orbit torque switching of perpendicular magnetization in ferromagnetic trilayers,"In ferromagnetic trilayers, a spin-orbit-induced spin current can have a spin
+polarization of which direction is deviated from that for the spin Hall effect.
+Recently, magnetization switching in ferromagnetic trilayers has been proposed
+and confirmed by the experiments. In this work, we theoretically and
+numerically investigate the switching current required for perpendicular
+magnetization switching in ferromagnetic trilayers. We confirm that the tilted
+spin polarization enables field-free deterministic switching at a lower current
+than conventional spin-orbit torque or spin-transfer torque switching, offering
+a possibility for high-density and low-power spin-orbit torque devices.
+Moreover, we provide analytical expressions of the switching current for an
+arbitrary spin polarization direction, which will be useful to design
+spin-orbit torque devices and to interpret spin-orbit torque switching
+experiments.",2002.02132v1
+2020-01-26,Lanthanide-radical magnetic coupling in [LnPc$_2$]$^0$: Competing exchange mechanisms captured via ab initio multi-reference calculations,"We present a computational investigation of the intramolecular exchange
+coupling in [LnPc$_2$]$^0$ (Ln = Tb, Dy, Ho, and Er) between the Ln$^{3+}$ 4f
+electrons and the spin-1/2 radical on the phthalocyanine ligands. A series of
+ab initio multi-configurational/multi-reference Complete/Restricted Active
+Space Self-Consistent-Field calculations (CASSCF/RASSCF), including
+non-perturbative spin--orbit coupling, were performed on [LnPc$_2$]$^0$ and on
+the smaller model compound [LnPz$_2$]$^0$. We find that the exchange coupling
+mechanisms are restricted by symmetry, but also dependent on the spin
+polarization effect triggered by the Pc$_2$ ligands $\pi$--$\pi^*$ excitations.
+The calculated exchange splittings are small, amounting to at most a few
+cm$^{-1}$, in disagreement with previous literature reports of strong
+antiferromagnetic coupling, but in good agreement with recent EPR experiments
+on [TbPc$_2$]$^0$. Furthermore, the coupling strength is found to decrease from
+[TbPc$_2$]$^0$ to [ErPc$_2$]$^0$, with decreasing number of unpaired electron
+spins in the lanthanide ground (Hund's rule) Russell--Saunders term.",2001.09420v1
+2016-12-22,Bismuth iron garnet Bi3Fe5O12: a room temperature magnetoelectric material,"The possibility to control the magnetic properties of a material with an
+electric field at room temperature is highly desirable for modern applications.
+Moreover, a coupling between magnetic and electric orders within a single
+material presenting a wide range of exceptional physical properties, such as
+bismuth iron garnet (BIG), may lead to great advances in the field of
+spintronic applications. In particular, the combination of the magnetoelectric
+(ME) coupling with the low damping of spin waves in BIG can allow the control
+and manipulation of spin waves by an electric field in magnonic devices. Here
+we report the unambiguous observation of linear magnetoelectric coupling above
+300 K in BIG using ferromagnetic resonance technique with electric field
+modulation. The measured coupling value is comparable with that observed for
+prototypal magnetoelectric Cr2O3. On the basis of our experimental results, the
+strength of this linear ME coupling is directly linked to the presence of
+bismuth ions inducing strong spin orbit coupling and to the appearance of local
+magnetic inhomogeneities related to the magnetic domain structure. The
+unprecedented combination of magnetic, optical and magnetoelectrical properties
+in BIG is expected to trigger significant interest for technological
+applications as well as for theoretical studies.",1612.07531v3
+2021-01-29,Probing the Spatial Variation of the Inter-Valley Tunnel Coupling in a Silicon Triple Quantum Dot,"Electrons confined in silicon quantum dots exhibit orbital, spin, and valley
+degrees of freedom. The valley degree of freedom originates from the bulk
+bandstructure of silicon, which has six degenerate electronic minima. The
+degeneracy can be lifted in silicon quantum wells due to strain and electronic
+confinement, but the ""valley splitting"" of the two lowest lying valleys is
+known to be sensitive to atomic-scale disorder. Large valley splittings are
+desirable to have a well-defined spin qubit. In addition, an understanding of
+the inter-valley tunnel coupling that couples different valleys in adjacent
+quantum dots is extremely important, as the resulting gaps in the energy level
+diagram may affect the fidelity of charge and spin transfer protocols in
+silicon quantum dot arrays. Here we use microwave spectroscopy to probe spatial
+variations in the valley splitting, and the intra- and inter-valley tunnel
+couplings ($t_{ij}$ and $t'_{ij}$) that couple dots $i$ and $j$ in a triple
+quantum dot (TQD). We uncover large spatial variations in the ratio of
+inter-valley to intra-valley tunnel couplings $t_{12}'/t_{12}=0.90$ and
+$t_{23}'/t_{23}=0.56$. By tuning the interdot tunnel barrier we also show that
+$t'_{ij}$ scales linearly with $t_{ij}$, as expected from theory. The results
+indicate strong interactions between different valley states on neighboring
+dots, which we attribute to local inhomogeneities in the silicon quantum well.",2101.12594v1
+2022-05-20,Quantum dot molecule devices with optical control of charge status and electronic control of coupling,"Tunnel-coupled pairs of optically active quantum dots - quantum dot molecules
+(QDMs) - offer the possibility to combine excellent optical properties such as
+strong light-matter coupling with two-spin singlet-triplet ($S-T_0$) qubits
+having extended coherence times. The $S-T_0$ basis formed using two spins is
+inherently protected against electric and magnetic field noise. However, since
+a single gate voltage is typically used to stabilize the charge occupancy of
+the dots and control the inter-dot orbital couplings, operation of the $S-T_0$
+qubits under optimal conditions remains challenging. Here, we present an
+electric field tunable QDM that can be optically charged with one (1h) or two
+holes (2h) on demand. We perform a four-phase optical and electric field
+control sequence that facilitates the sequential preparation of the 2h charge
+state and subsequently allows flexible control of the inter-dot coupling.
+Charges are loaded via optical pumping and electron tunnel ionization. We
+achieve one- and two-hole charging efficiencies of 93.5 $\pm$ 0.8 % and 80.5
+$\pm$ 1.3 %, respectively. Combining efficient charge state preparation and
+precise setting of inter-dot coupling allows control of few-spin qubits, as
+would be required for on-demand generation of two-dimensional photonic cluster
+states or quantum transduction between microwaves and photons.",2205.10001v1
+2023-03-10,Coherent detection of hidden spin-lattice coupling in a van der Waals antiferromagnet,"Strong interactions between different degrees of freedom lead to exotic
+phases of matter with complex order parameters and emergent collective
+excitations. Conventional techniques, such as scattering and transport, probe
+the amplitudes of these excitations, but they are typically insensitive to
+phase. Therefore, novel methods with phase sensitivity are required to
+understand ground states with phase modulations and interactions that couple to
+the phase of collective modes. Here, by performing phase-resolved coherent
+phonon spectroscopy (CPS), we reveal a hidden spin-lattice coupling in a vdW
+antiferromagnet FePS$_{3}$ that eluded other phase-insensitive conventional
+probes, such as Raman and X-ray scattering. With comparative analysis and
+analytical calculations, we directly show that the magnetic order in FePS$_{3}$
+selectively couples to the trigonal distortions through partially filled
+t$_{2g}$ orbitals. This magnetoelastic coupling is linear in magnetic order and
+lattice parameters, rendering these distortions inaccessible to inelastic
+scattering techniques. Our results not only capture the elusive spin-lattice
+coupling in FePS$_3$, but also establish phase-resolved CPS as a tool to
+investigate hidden interactions.",2303.05963v1
+2004-10-14,The distribution and cosmic evolution of massive black hole spins,"We study the expected distribution of massive black hole (MBH) spins and its
+evolution with cosmic time in the context of hierarchical galaxy formation
+theories. Our model uses Monte Carlo realizations of the merger hierarchy in a
+LCDM cosmology, coupled to semi-analytical recipes, to follow the merger
+history of dark matter halos, the dynamics of the MBHs they host, and their
+growth via gas accretion and binary coalescences. The coalescence of comparable
+mass holes increases the spin of MBHs, while the capture of smaller companions
+in randomly-oriented orbits acts to spin holes down. We find that, given the
+distribution of MBH binary mass ratios in hierarchical models, binary
+coalescences alone do not lead to a systematic spin-up or spin-down of MBHs
+with time: the spin distribution retains memory of its initial conditions. By
+contrast, because of the Bardeen-Petterson effect, gas accretion via a thin
+disk tends to spin holes up even if the direction of the spin axis changes
+randomly in time. In our models, accretion dominates over black hole captures
+and efficiently spins holes up. The spin distribution is heavily skewed towards
+fast-rotating Kerr holes, is already in place at early epochs, and does not
+change much below redshift 5. If accretion is via a thin disk, about 70% of all
+MBHs are maximally rotating and have radiative efficiencies approaching 30%
+(assuming a ""standard'' spin-efficiency conversion). Even in the conservative
+case where accretion is via a geometrically thick disk, about 80% of all MBHs
+have spin parameters a/m > 0.8 and accretion efficiencies > 12%. Rapidly
+spinning holes with high radiative efficiencies may satisfy constraints based
+on comparing the local MBH mass density with the mass density inferred from
+luminous quasars (Soltan's argument).",0410342v1
+2019-11-20,"Tunable large spin Hall and spin Nernst effects in Dirac semimetals ZrXY (X=Si, Ge; Y=S, Se, Te)","The ZrSiS-type compounds are Dirac semimetals and have been attracting
+considerable interest in recent years due to their topological electronic
+properties and possible applications. In particular, gapped Dirac nodes can
+possess large spin Berry curvatures and thus give rise to large spin Hall
+effect (SHE) and spin Nernst effect (SNE), which may be used to generate pure
+spin current for spintronics and spin caloritronics without applied magnetic
+field or magnetic material. In this paper we study both SHE and SNE in ZrXY (X
+= Si, Ge; Y = S, Se, Te) based on \textit{ab initio} relativistic band
+structure calculations. Our theoretical calculations reveal that some of these
+compounds exhibit large intrinsic spin Hall conductivity (SHC) and spin Nernst
+conductivity (SNC). The calculated SHC of ZrSiTe is as large as -755
+($\hbar$/e)(S/cm). Since the electric conductivity of these Dirac semimetals
+are much smaller than that of platinum which has the largest intrinsic SHC of
+$\sim$2200 ($\hbar$/e)(S/cm), this indicates that they will have a larger spin
+Hall angle than that of platinum. Remarkably, we find that both the magnitude
+and sign of the SHE and SNE in these compounds can be significantly tuned by
+changing either the electric field direction or spin current direction and may
+also be optimized by slightly varying the Fermi level via chemical doping.
+Analysis of the calculated band- and $k$-resolved spin Berry curvatures show
+that the large SHE and SNE as well as their remarkable tunabilities originate
+from the presence of many slightly spin-orbit coupling-gapped Dirac nodal lines
+near the Fermi level in these Dirac semimetals. Our findings suggest that the
+ZrSiS-type compounds are promising candidates for spintronic and spin
+caloritronic devices, and will certainly stimulate further experiments on these
+Dirac semimetals.",1911.08902v1
+2021-05-19,Optical manipulation of Rashba-split 2-Dimensional Electron Gas,"In spintronic devices, the two main approaches to actively control the
+electrons' spin degree of freedom involve either static magnetic or electric
+fields. An alternative avenue relies on the application of optical fields to
+generate spin currents, which promises to bolster spin-device performance
+allowing for significantly faster and more efficient spin logic. To date,
+research has mainly focused on the optical injection of spin currents through
+the photogalvanic effect, and little is known about the direct optical control
+of the intrinsic spin splitting. Here, to explore the all-optical manipulation
+of a material's spin properties, we consider the Rashba effect at a
+semiconductor interface. The Rashba effect has long been a staple in the field
+of spintronics owing to its superior tunability, which allows the observation
+of fully spin-dependent phenomena, such as the spin-Hall effect, spin-charge
+conversion, and spin-torque in semiconductor devices. In this work, by means of
+time and angle-resolved photoemission spectroscopy (TR-ARPES), we demonstrate
+that an ultrafast optical excitation can be used to manipulate the
+Rashba-induced spin splitting of a two-dimensional electron gas (2DEG)
+engineered at the surface of the topological insulator Bi$_{2}$Se$_{3}$. We
+establish that light-induced photovoltage and charge carrier redistribution --
+which in concert modulate the spin-orbit coupling strength on a sub-picosecond
+timescale -- can offer an unprecedented platform for achieving all
+optically-driven THz spin logic devices.",2105.09320v2
+1994-03-03,An Orbitally Degenerate Spin Fluctuation Model for Heavy Fermion Superconductivity,"In this paper, a generalization of standard spin fluctuation theory is
+considered by replacing the simple Hubbard interaction by the screened
+Hartree-Fock interaction for f electrons. This model is then used in both an LS
+and a JJ coupling scheme to construct the particle-particle scattering vertex
+in an on-site approximation. This vertex is shown to lead to an instability for
+a superconducting pair state which obeys Hunds rules, with L=5, S=1, and J=4.
+The degeneracy of this state is broken by anisotropy of the quasiparticle
+wavefunctions. Detailed calculations are presented for the case of $UPt_3$.",9403018v1
+1999-08-03,Semiclassical mechanics of a non-integrable spin cluster,"We study detailed classical-quantum correspondence for a cluster system of
+three spins with single-axis anisotropic exchange coupling. With autoregressive
+spectral estimation, we find oscillating terms in the quantum density of states
+caused by classical periodic orbits: in the slowly varying part of the density
+of states we see signs of nontrivial topology changes happening to the energy
+surface as the energy is varied. Also, we can explain the hierarchy of quantum
+energy levels near the ferromagnetic and antiferromagnetic states with EKB
+quantization to explain large structures and tunneling to explain small
+structures.",9908055v1
+1999-11-10,The energy-level statistics in the core of a vortex in a p-wave superconductor,"In the presence of strong disorder, the statistics of quasiparticle levels in
+the core of a vortex in a two-dimensional p-wave superconductor belongs to the
+universality class B corresponding to the ensemble of orthogonal matrices in
+odd dimensions. This novel universality class appears as a consequence of the
+O(2) spin symmetry of p-wave pairing. It is preserved in the presence of random
+disorder, of electromagnetic vector potential, and of an admixture of the
+pairing of opposite chirality in the vortex core, but may be destroyed by
+spin-orbit coupling and by Zeeman splitting.",9911147v2
+2000-01-19,Ground and Metastable States in $γ$-Ce from Correlated Band Theory,"Multiple energy minima of the LDA+U energy functional are obtained for
+$\gamma$-Ce when it is implemented in a full potential, rotationally invariant
+scheme including spin-orbit coupling, and different starting local
+configurations are chosen. The lowest energy solution leads to a fully spin
+polarized 4f state and the lattice constant of $\gamma$-Ce. The higher energy
+local minima (additional self-consistent solutions) are shown to be strongly
+indicative of crystal electric field and multiplet excitations.",0001255v1
+2000-02-09,Fluctuating spin g-tensor in small metal grains,"In the presence of spin-orbit scattering, the splitting of an energy level in
+a generic small metal grain due to the Zeeman coupling to a magnetic field B
+depends on the direction of B, as a result of mesoscopic fluctuations. The
+anisotropy is described by the eigenvalues g_j^2 (j=1,2,3) of a tensor G,
+corresponding to the (squares of) g-factors along three principal axes. We
+consider the statistical distribution of G and find that the anisotropy is
+enhanced by eigenvalue repulsion between the g_j.",0002139v1
+2000-05-28,Highly anisotropic g-factor of two-dimensional hole systems,"Coupling the spin degree of freedom to the anisotropic orbital motion of
+two-dimensional (2D) hole systems gives rise to a highly anisotropic Zeeman
+splitting with respect to different orientations of an in-plane magnetic field
+B relative to the crystal axes. This mechanism has no analogue in the bulk band
+structure. We obtain good, qualitative agreement between theory and
+experimental data, taken in GaAs 2D hole systems grown on (113) substrates,
+showing the anisotropic depopulation of the upper spin subband as a function of
+in-plane B.",0005488v1
+2002-10-08,Coulomb Correlations and Magnetic Anisotropy in ordered $L1_0$ CoPt and FePt alloys,"We present results of the magneto-crystalline anisotropy energy (MAE)
+calculations for chemically ordered $L1_0$ CoPt and FePt alloys taking into
+account the effects of strong electronic correlations and spin-orbit coupling.
+The local spin density + Hubbard U approximation (LSDA+U) is shown to provide a
+consistent picture of the magnetic ground state properties when intra-atomic
+Coulomb correlations are included for both 3$d$ and 5$d$ elements. Our results
+demonstrate significant and complex contribution of correlation effects to
+large MAE of these material.",0210157v2
+2003-02-20,Prediction of a surface magnetic moment in alpha-uranium,"Recently, there has been an increased interest in first-principles
+calculations of the actinides as well as in finding the new materials which
+display surface magnetism. We predict the existence of a magnetic moment on the
+uranium (001) surface by performing density functional calculations for a slab
+geometry in the generalized gradient and local spin density approximations with
+included spin orbit coupling. The ferromagnetic phase is energetically favored
+for all geometries. The calculated total magnetic moment, $0.65{\mu_{B}}$, is
+stable on films of different thickness and it should be observable
+experimentally.",0302423v1
+2003-06-13,Rashba precession in quantum wires,"The length over which electron spins reverse direction due to the Rashba
+effect when injected with an initial polarization along the axes of a quantum
+wire is investigated theoretically. A soft wall confinement of the wire
+renormalizes the spin-orbit parameter (and the effective mass) stronger than
+hard walls. Electron-electron interactions enhance the Rashba precession while
+evidence is found that the coupling between transport channels may suppress it.",0306359v1
+2003-11-03,"Comment on ""Low-dimensional spin S=1/2 system at the quantum critical limit: Na2V3O7""","We contest the interpretation by Gavilano et al. (Phys.Rev.Lett. 90 (2003)
+167202) of violation of the Curie law behavior of the paramagnetic
+susceptibility at low temperatures by means of the quenching of the V4+-ion
+moment. These results can be understood as caused by well-known conventional
+phenomena like crystal-field interactions but with taking into account the
+intra-atomic spin-orbit coupling for the V4+ ion.",0311033v1
+2003-11-28,g-factor engineering and control in self-assembled quantum dots,"The knowledge of electron and hole g-factors, their control and engineering
+are key for the usage of the spin degree of freedom for information processing
+in solid state systems. The electronic g-factor will be materials dependent,
+the effect being larger for materials with large spin-orbit coupling. Since
+electrons can be individually trapped into quantum dots in a controllable
+manner, they may represent a good platform for the implementation of quantum
+information processing devices. Here we use self-assembled quantum dots of InAs
+embedded in GaAs for the g-factor control and engineering.",0311644v1
+2004-06-22,Are Th doped Y2C3 and La2C3 two-band superconductors?,"The superconducting sesquicarbides R2C3 have noncentrosymmetric point group
+symmetry Td. Spin-orbit coupling lifts the spin degeneracy of electronic bands
+in the most of the Brillouin zone. Nevertheless, due to high symmetry, there
+are a few directions along which the Fermi surfaces must touch. This leads to
+the two-band effects in the superconducting state.",0406527v2
+2005-11-18,Charge ordering in quasi-one-dimensional systems with frustrating interactions,"Motivated by the co-existing charge and spin order found in strongly
+correlated ladder systems, we study an effective pseudospin model on a coupled
+two-leg ladder. A bosonisation analysis yields a rich phase diagram showing
+Wigner/Peierls charge order and Neel/dimer spin order. In a broad parameter
+regime, the orbital antiferromagnetic phase is found to be stable. An
+intermediate gapless phase of finite width is found to lie in between two
+charge-ordered gapped phases. Our work is potentially relevant for a unified
+description of a class of strongly correlated, quarter-filled ladder systems.",0511458v1
+2005-12-11,Interplay between Zeeman interaction and spin-orbit coupling in a two-dimensional semiconductor system,"We analyse the interplay between Dresselhaus, Bychkov-Rashba, and Zeeman
+interactions in a two-dimensional semiconductor quantum system under the action
+of a magnetic field. When a vertical magnetic field is considered, we predict
+that the interplay results in an effective cyclotron frequency that depends on
+a spin-dependent contribution. For in-plane magnetic fields, we found that the
+interplay induces an anisotropic effective gyromagnetic factor that depends on
+the orientation of the applied field as well as on the orientation of the
+electron momentum.",0512231v1
+2006-08-01,Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites,"We show that the symmetry of the spin zigzag chain E phase of the
+orthorhombic perovskite manganites and nickelates allows for the existence of a
+finite ferroelectric polarization. The proposed microscopic mechanism is
+independent of spin-orbit coupling. We predict that the polarization induced by
+the E-type magnetic order can potentially be enhanced by up to two orders of
+magnitude with respect to that in the spiral magnetic phases of TbMnO3 and
+similar multiferroic compounds.",0608025v2
+1998-01-05,Flow equations in the light-front perturbation theory,"The method of flow equations is applied to QED in the light-front dynamics.
+To second order in the coupling the particle number conserving part of the
+effective QED Hamiltonian has two terms of different structure. The first term
+gives the Coulomb interaction and the correct spin splittings of positronium;
+the contribution of the second term to mass spectrum depends on the explicit
+form of unitary transformation and may influence the spin-orbit.",9801018v3
+1998-10-30,T-Duality and Spinning Solutions in 2 + 1 Gravity,"Starting with the 2+1 Einstein--Maxwell--Dilaton system with a cosmological
+constant and assuming two commuting Killing symmetries we derive the
+corresponding $1+0 \sigma$--model. It is shown that, for general values of the
+coupling parameters, the $T$--duality group is $SL(2,R)$, which coincides with
+the group of linear coordinate transformations along the Killing orbits. This
+duality, along with a suitable parameter choice, is applied to obtain some new
+spinning solutions in the alternative gravity theories: Einstein--Maxwell,
+Brans--Dicke and Einstein--Maxwell--Dilaton.",9810245v1
+2006-04-01,Galilei invariant theories. I. Constructions of indecomposable finite-dimensional representations of the homogeneous Galilei group: directly and via contractions,"All indecomposable finite-dimensional representations of the homogeneous
+Galilei group which when restricted to the rotation subgroup are decomposed to
+spin 0, 1/2 and 1 representations are constructed and classified. These
+representations are also obtained via contractions of the corresponding
+representations of the Lorentz group. Finally the obtained representations are
+used to derive a general Pauli anomalous interaction term and Darwin and
+spin-orbit couplings of a Galilean particle interacting with an external
+electric field.",0604002v1
+2003-03-20,Dressed Qubits,"Inherent gate errors can arise in quantum computation when the actual system
+Hamiltonian or Hilbert space deviates from the desired one. Two important
+examples we address are spin-coupled quantum dots in the presence of spin-orbit
+perturbations to the Heisenberg exchange interaction, and off-resonant
+transitions of a qubit embedded in a multilevel Hilbert space. We propose a
+``dressed qubit'' transformation for dealing with such inherent errors. Unlike
+quantum error correction, the dressed qubits method does not require additional
+operations or encoding redundancy, is insenstitive to error magnitude, and
+imposes no new experimental constraints.",0303129v3
+2004-02-23,Holonomic Quantum Computing Based on the Stark Effect,"We propose a spin manipulation technique based entirely on electric fields
+applied to acceptor states in $p$-type semiconductors with spin-orbit coupling.
+While interesting in its own right, the technique can also be used to implement
+fault-resilient holonomic quantum computing. We explicitly compute adiabatic
+transformation matrix (holonomy) of the degenerate states and comment on the
+feasibility of the scheme as an experimental technique.",0402165v1
+2006-05-11,On the Generator of Lorentz Boost,"Traditionally, the theory related to the spatial angular momentum has been
+studied completely, while the investigation in the generator of Lorentz boost
+is inadequate. In this paper we show that the generator of Lorentz boost has a
+nontrivial physical significance, it endows a charged system with an electric
+moment, and has an important significance for the electrical manipulations of
+electron spin in spintronics. An alternative treatment and interpretation for
+the traditional Darwin term and spin-orbit coupling are given.",0605101v4
+2007-04-23,Ferroelectricity driven by the non-centrosymmetric magnetic ordering in multiferroic TbMn_2O_5: a first-principles study,"The ground state structural, electronic and magnetic properties of
+multiferroic TbMn$_2$O$_5$ are investigated via first-principles calculations.
+We show that the ferroelectricity in TbMn$_2$O$_5$ is driven by the
+non-centrosymmetric magnetic ordering, without invoking the spin-orbit coupling
+and non-collinear spins. The {\it intrinsic} electric polarization in this
+compound is calculated to be 1187 $nC\cdot$ cm$^{-2}$, an order of magnitude
+larger than previously thought.",0704.2908v2
+2007-09-05,Effects of interactions in transport through Aharonov-Bohm-Casher interferometers,"We study the conductance through a ring described by the Hubbard model (such
+as an array of quantum dots), threaded by a magnetic flux and subject to Rashba
+spin-orbit coupling (SOC). We develop a formalism that is able to describe the
+interference effects as well as the Kondo effect when the number of electrons
+in the ring is odd. In the Kondo regime, the SOC reduces the conductance from
+the unitary limit, and in combination with the magnetic flux, the device acts
+as a spin polarizer.",0709.0643v1
+2008-05-18,The Aharonov-Bohm-Casher ring-dot as a flux-tunable resonant tunneling diode,"A mesoscopic ring subject to the Rashba spin-orbit interaction and
+sequentially coupled to an interacting quantum dot, in the presence of
+Aharonov-Bohm flux, is proposed as a flux tunable tunneling diode. The analysis
+of the conductance by means of the nonequilibrium Green's function technique,
+shows an intrinsic bistability at varying the Aharonov-Bohm flux when 2U > \pi
+\Gamma, U being the charging energy on the dot and \Gamma the effective
+resonance width. The bistability properties are discussed in connection with
+spin-switch effects and logical storage device applications.",0805.2715v1
+2009-02-18,"Structural, Magnetic, and Electronic Properties of the Monometallofullerene Gd@C_82 : Theory","The structural, electronic, and magnetic properties of Gd@C_82 endohedral
+metallofullerene have been studied by employing on-site correlation corrected,
+scalar-relativistic and full-relativistic density functional theory within the
+local density and generalized gradient approximations. The experimentally
+observed reduction of the magnetic moment of Gd@C_82 with respect to that of a
+free Gd^+3 ion can be explained by a tiny hybridization between unoccupied
+Gd-4f states and carbon-pi states, resulting in a generic antiferromagnetic
+coupling of the Gd-4f spin with the remaining unpaired spin in the hybridized
+molecular orbital.",0902.3218v1
+2010-01-11,Nonlocal effects on magnetism in the diluted magnetic semiconductor Ga_{1-x}Mn_{x}As,"The magnetic properties of the diluted magnetic semiconductor
+Ga_{1-x}Mn_{x}As are studied within the dynamical cluster approximation. We use
+the k-dot-p Hamiltonian to describe the electronic structure of GaAs with
+spin-orbit coupling and strain effects. We show that nonlocal effects are
+essential for explaining the experimentally observed transition temperature and
+saturation magnetization. We also demonstrate that the cluster anisotropy is
+very strong and induces rotational frustration and a cube-edge direction
+magnetic anisotropy at low temperature. With this, we explain the
+temperature-driven spin reorientation in this system.",1001.1716v1
+2010-03-05,Helical liquids and Majorana bound states in quantum wires,"We show that the combination of spin-orbit coupling with a Zeeman field or
+strong interactions may lead to the formation of a helical liquid in
+single-channel quantum wires. In a helical liquid, electrons with opposite
+velocities have opposite spin precession. We argue that zero-energy Majorana
+bound states are formed in various situations when the wire is situated in
+proximity to a conventional s-wave superconductor. This occurs when the
+external magnetic field, the superconducting gap, or, in particular, the
+chemical potential vary along the wire. We discuss experimental consequences of
+the formation of the helical liquid and the Majorana bound states.",1003.1145v2
+2011-04-29,Meissner effect in the layered Kane-Mele model with Hubbard interaction,"We investigate the magnetic response in the quantum spin Hall phase of the
+layered Kane-Mele model with Hubbard interaction, and argue a condition to
+obtain the Meissner effect. The effect of Rashba spin orbit coupling is also
+discussed.",1104.5555v1
+2012-02-22,A description of odd mass W-isotopes in the Interacting 2 Boson-Fermion Model,"The negative and positive parity low-spin states of the even-odd Tungsten
+isotopes, 183,185,187W are studied in the frame work of the Interacting
+Boson-Fermion Approximation (IBFA) model. The fermion that is coupled to the
+system of bosons is taken to be in the negative parity 2f_7|2, 2f_5\2, 3p_3\2,
+3p_1\2 and in the positive parity 1i_13\2 single-particle orbits. The
+calculated energies of low-spin energy levels of the odd isotopes are found to
+agree well with the experimental data. Also B(E2) values and spectroscopic
+factors for single-neutron transfer are calculated and found to be in good
+agreement with experimental data.",1202.4987v1
+2012-06-20,Magnetoelectric nature of skyrmions in a chiral magnetic insulator Cu2OSeO3,"Dielectric properties were investigated under various magnitudes and
+directions of magnetic field (H) for a chiral magnetic insulator Cu2OSeO3. We
+found that the skyrmion crystal induces electric polarization (P) along either
+in-plane or out-of-plane direction of the spin vortices depending on the
+applied H-direction. The observed H-dependence of P in ferrimagnetic,
+helimagnetic, and skyrmion crystal state can be consistently described by the
+d-p hybridization model, highlighting an important role of relativistic
+spin-orbit interaction in the magnetoelectric coupling in Cu2OSeO3. Our
+analysis suggests that each skyrmion particle can locally carry electric dipole
+or quadrupole, which implies that the dynamics of skyrmions are controllable by
+the external electric field.",1206.4404v1
+2012-08-13,Helical States in Curved Bilayer Graphene,"We study spin effects of quantum wires formed in bilayer graphene by
+electrostatic confinement. With a proper choice of the confinement direction,
+we show that in the presence of magnetic field, spin-orbit interaction induced
+by curvature, and intervalley scattering, bound states emerge that are helical.
+The localization length of these helical states can be modulated by the gate
+voltage which enables the control of the tunnel coupling between two parallel
+wires. Allowing for proximity effect via an s-wave superconductor, we show that
+the helical modes give rise to Majorana fermions in bilayer graphene.",1208.2601v1
+2013-02-04,Rashba split surface states in BiTeBr,"Within density functional theory, we study bulk band structure and surface
+states of BiTeBr. We consider both ordered and disordered phases which differ
+in atomic order in the Te-Br sublattice. On the basis of relativistic ab-initio
+calculations, we show that the ordered BiTeBr is energetically preferable as
+compared with the disordered one. We demonstrate that both Te- and
+Br-terminated surfaces of the ordered BiTeBr hold surface states with a giant
+spin-orbit splitting. The Te-terminated surface-state spin splitting has the
+Rashba-type behavior with the coupling parameter \alpha_R ~ 2 eV\AA.",1302.0704v1
+2013-03-14,Intrinsic Bistability In Quantum Point Contacts with in-plane Side Gates,"We study the onset of intrinsic bistability and accompanying hysteresis in a
+single quantum point contact (QPC) with in-plane side gates in the presence of
+lateral spin-orbit coupling. The hysteresis in the conductance versus common
+gate voltage applied to the two side gates exists only if the narrow portion of
+the QPC is long enough. The hysteresis is absent if the effects of
+electron-electron interaction are neglected but increases with the strength of
+the electron-electron interaction. The hysteresis appears in the region of
+conductance anomalies, i.e., less than 2e2/h, and is due to multistable spin
+textures in these regions.",1303.3429v1
+2013-04-26,Ferroelectricity from iron valence ordering in rare earth ferrites?,"The possibility of multiferroicity arising from charge ordering in LuFe2O4
+and structurally related rare earth ferrites is reviewed. Recent experimental
+work on macroscopic indications of ferroelectricity and microscopic
+determination of coupled spin and charge order indicates that this scenario
+does not hold. Understanding the origin of the experimentally observed charge
+and spin order will require further theoretical work. Other aspects of recent
+research in these materials, such as geometrical frustration effects, possible
+electric-field-induced transitions, or orbital order are also briefly treated.",1304.7255v1
+2013-12-26,Prediction of a quantum anomalous Hall state in Co decorated silicene,"Based on first-principles calculations, we demonstrate that Co decorated
+silicene can host a quantum anomalous Hall state. The exchange field induced by
+the Co atoms combined with the strong spin orbit coupling of the silicene opens
+a nontrivial band gap at the K-point. As compared to other transition metals,
+Co decorated silicene is unique in this respect, since usually hybridization
+and spin-polarization induced in the silicene suppress a quantum anomalous Hall
+state.",1312.7127v2
+2014-08-20,Vortex Core Structure in Multilayered Rashba Superconductors,"We numerically study the electronic structure of a single vortex in two
+dimensional superconducting bilayer systems within the range of the mean-field
+theory. The lack of local inversion symmetry in the system is taken into
+account through the layer dependent Rashba spin-orbit coupling. The spatial
+profiles of the pair potential and the local quasiparticle density of states
+are calculated in the clean spin-singlet superconductor on the basis of the
+quasiclassical theory. In particular, we discuss the characteristic core
+structure in the pair-density wave state, which is spatially modulated exotic
+superconducting phase in a high magnetic field.",1408.4550v1
+2015-02-05,DFT calculations of magnetic anisotropy energy for GeMnTe ferromagnetic semiconductor,"Density functional theory (DFT) calculations of the energy of magnetic
+anisotropy for diluted ferromagnetic semiconductor GeMnTe were performed using
+using OpenMX package with fully relativistic pseudopotentials. The influence of
+hole concentration and magnetic ion neighborhood on magnetic anisotropy energy
+is presented. Analysis of microscopic mechanism of magnetic anisotropy is
+provided, in particular the role of spin-orbit coupling, spin polarization and
+spatial changes of electron density are discussed. The calculations are in
+accordance with the experimental observation of perpendicular magnetic
+anisotropy in rhombohedral GeMnTe (111) thin layers.",1502.01715v3
+2016-02-02,Majorana bound states in magnetic skyrmions,"Magnetic skyrmions are highly mobile nanoscale topological spin textures. We
+show, both analytically and numerically, that a magnetic skyrmion of an even
+azimuthal winding number placed in proximity to an s-wave superconductor hosts
+a zero-energy Majorana bound state in its core, when the exchange coupling
+between the itinerant electrons and the skyrmion is strong. This Majorana bound
+state is stabilized by the presence of a spin-orbit interaction. We propose the
+use of a superconducting tri-junction to realize non-Abelian statistics of such
+Majorana bound states.",1602.00968v3
+2017-02-23,Azimuthal asymmetries in SIDIS di-hadron muoproduction off longitudinally polarized protons at COMPASS,"In this review a first comprehensive study of azimuthal asymmetries in
+semi-inclusive deep inelastic muoproduction of hadron pairs off longitudinally
+polarized protons at COMPASS is presented. The study is based on data taken in
+2007 and 2011, obtained by impinging a high-energetic $\mu^+$ beam of $160$
+GeV/$\it{c}$, respectively $200$ GeV/$\it{c}$, momentum on a solid ammonia
+target. The discussion is focused on both leading and subleading longitudinal
+target-spin-dependent asymmetries arising in the di-hadron SIDIS cross section,
+addressing the role of spin-orbit couplings and quark-gluon correlations in the
+framework of collinear or transverse momentum dependent factorization.",1702.07317v1
+2011-11-04,Rashba diamond in an Aharonov-Casher ring,"Spin interference due to Rashba spin-orbit interaction (SOI) in a ballistic
+two-dimensional electron gas (2DEG) ring conductor submitted to a bias voltage
+is investigated theoretically. We calculate the scattering matrices and
+differential conductance with lead-ring junction coupling as an adjustable
+parameter. Due to the interference of electronic waves traversing the ring, the
+differential conductance modulated by both bias voltage and SOI exhibits a
+diamond-shaped pattern, thus termed as \ti{Rashba diamond}. This feature offers
+a supplementary degree of freedom to manipulate phase interference.",1111.1244v1
+2011-11-21,Hexagonal pnictide SrPtAs: superconductivity with locally broken inversion symmetry,"Unlike other pnictides, SrPtAs has a hexagonal structure, containing layers
+with As-Pt atoms that form a honeycomb lattice. These layers lack inversion
+symmetry which allows for a spin-orbit coupling that we show has a dramatic
+effect on superconductivity in this material. In particular, for conventional
+s-wave superconductivity in SrPtAs, both the spin susceptibility and the
+paramagnetic limiting field are enhanced significantly with respect to that
+usually expected for s-wave superconductors. SrPtAs provides a prime example of
+a superconductor with locally broken inversion symmetry.",1111.5058v1
+2012-01-06,Anisotropic magneto-resistance in a GaMnAs-based single impurity tunnel diode: a tight binding approach,"Using an advanced tight-binding approach, we estimate the anisotropy of the
+tunnel transmission associated with the rotation of the 5/2 spin of a single Mn
+atom forming an acceptor state in GaAs and located near an AlGaAs tunnel
+barrier. Significant anisotropies in both in-plane and out-of-plane geometries
+are found, resulting from the combination of the large spin-orbit coupling
+associated with the p-d exchange interaction, cubic anisotropy of heavy-hole
+dispersion and the low C2v symmetry of the chemical bonds.",1201.1439v1
+2018-01-10,Zeeman-Induced Gapless Superconductivity with Partial Fermi Surface,"We show that an in-plane magnetic field can drive two-dimensional
+spin-orbit-coupled systems under superconducting proximity effect into a
+gapless phase where parts of the normal state Fermi surface are gapped, and the
+ungapped parts are reconstructed into a small Fermi surface of Bogoliubov
+quasiparticles at zero energy. Charge distribution, spin texture, and density
+of states of such ""partial Fermi surface"" are discussed. Material platforms for
+its physical realization are proposed.",1801.03522v3
+2019-02-13,Curvature stabilized skyrmions with angular momentum,"We examine skyrmionic field configurations on a spherical ferromagnet with
+large normal anisotropy. Exploiting variational concepts of angular momentum we
+find a new family of localized solutions to the Landau-Lifshitz equation that
+are topologically distinct from the ground state and not equivariant.
+Significantly, we observe an emergent spin-orbit coupling on the level of
+magnetization dynamics in a simple system without individual rotational
+invariance in spin and coordinate space.",1902.04881v2
+2019-03-21,Non-Abelian Majorana fermions in topological $s$-wave Fermi superfluids,"By solving the Bogoliubov--De Gennes equations analytically, we derive the
+fermionic zero-modes satisfying the Majorana property that exist in vortices of
+a two-dimensional $s$-wave Fermi superfluid with spin-orbit coupling and Zeeman
+spin-splitting. The Majorana zero-mode becomes normalisable and exponentially
+localised to the vicinity of the vortex core when the superfluid is
+topologically non-trivial. We calculate the energy splitting due to Majorana
+hybridisation and identify that the $s$-wave Majorana vortices obey non-Abelian
+statistics.",1903.09131v3
+2020-08-16,Magnon dispersion in bilayers of two-dimensional ferromagnets,"We determine magnon spectra of an atomic bilayer magnet with ferromagnetic
+intra- and both ferro- and anti- ferromagnetic interlayer coupling. Analytic
+expressions for the full magnon band of the latter case reveal that both
+exchange interactions govern the fundamental magnon gap. The inter and
+intralayer magnetic ordering are not independent: the intralayer ferromagnetism
+stabilizes antiferromagnetic inter-layer order. The topology of these
+exchange-anisotropy spin models without spin-orbit interaction turns out to be
+trivial.",2008.06875v2
+2017-07-05,Multiband Electronic Structure of Magnetic Quantum Dots: Numerical Studies,"Semiconductor quantum dots (QDs) doped with magnetic impurities have been a
+focus of continuous research for a couple of decades. A significant effort has
+been devoted to studies of magnetic polarons (MP) in these nanostructures.
+These collective states arise through exchange interaction between a carrier
+confined in a QD and localized spins of the magnetic impurities (typically:
+Mn). We discuss our theoretical description of various MP properties in
+self-assembled QDs. We present a self-consistent, temperature-dependent
+approach to MPs formed by a valence band hole. We use the Luttinger-Kohn k.p
+Hamiltonian to account for the important effects of spin-orbit interaction.",1707.01565v1
+2017-07-27,Ultrafast nanoscale magnetic switching via intense picosecond electron bunches,"The magnetic field associated with a picosecond intense electron pulse is
+shown to switch locally the magnetization of extended films and nanostructures
+and to ignite locally spin waves excitations. Also, topologically protected
+magnetic textures such as skyrmions can be imprinted swiftly in a sample with a
+residual Dzyaloshinskii-Moriya spin-orbital coupling. Characteristics of the
+created excitations such as the topological charge or the width of the magnon
+spectrum can be steered via the duration and the strength of the electron
+pulses. The study points to a possible way for a spatiotemporally controlled
+generation of magnetic and skyrmionic excitations.",1707.08838v1
+2021-01-22,Optical polarization skyrmionic fields in free space,"We construct optical beams in free space with robust skyrmionic structures in
+their polarization fields, both in the electric spin vector for near-circular
+fields and in the polarization direction for near-linear fields, and for both
+Bloch (spiral) and N\'eel (hedgehog) textures. These structures are made
+possible by the spin-orbit coupling of tightly-focused nonparaxial optics as
+applied to higher-order Full-Poincar\'e beams, as well as by standing-wave
+configurations comprising forwards- and backwards-propagating waves. Our
+constructions show near-uniform circular and linear polarizations, providing a
+high degree of topological protection in the absence of nonlinear interactions.",2101.09254v2
+2022-02-21,Bilinear magnetoresistance in topological insulators: role of magnetic disorder,"Bilinear magnetoresistance is a nonlinear transport phenomenon that scales
+linearly with the electric and magnetic fields, and appears in nonmagnetic
+systems with strong spin-orbit coupling, such as topological insulators (TIs).
+Using the semiclassical Boltzmann theory and generalized relaxation time
+approximation, we consider in detail the bilinear magnetoresistance in an
+effective model describing surface states of three-dimensional topological
+insulators. We show that the presence of magnetic impurities remarkably
+modifies the BMR signal. In general, scattering on magnetic impurities reduces
+magnitude of BMR. Apart from this, an additional modulation of the angular
+dependence of BMR appears when the spin-dependent component of the impurity
+potential dominates the scalar one.",2202.10077v1
+2022-07-12,Stability of Skyrmion Crystal Phase in Centrosymmetric Distorted Triangular-Lattice Antiferromagnets,"The stability of a magnetic skyrmion crystal in a centrosymmetric
+orthorhombic lattice system is numerically investigated. By performing the
+simulated annealing for an effective spin model with the momentum-resolved
+interaction on a uniaxially distorted triangular lattice, we find that the
+skyrmion crystal is robustly realized when dominant interaction channels
+consist of the double-$Q$ structure in momentum space. Moreover, we show that
+an anti-type skyrmion crystal with the opposite skyrmion number is obtained by
+tuning the sign of the bond-dependent anisotropic exchange interaction that
+originates from the relativistic spin-orbit coupling.",2207.05862v1
+2022-09-20,Possible origin of the interface field in spintronic experiments,"The effective field at the interface between ferromagnetic and metal layers
+is often observed in spintronic experiments. It is common to ascribe it to
+specific exchange interactions caused by spin-orbit coupling, namely, Rashba
+field, Dzyaloshinskiy-Moriya interaction, spin currents, etc. Alternative view
+involves the global magnetic field (Oersted field) generated by current both
+inside and outside the conductor. It is shown here that the inhomogeneous stray
+field surrounding ferromagnetic layers can produce significant contribution
+into the observed interface field. This mechanism should be taken into account
+for better understanding the current-induced phenomena in magnetic multilayers.",2209.09738v1
+2022-12-27,Tuning quantum paramagnetism and d-wave superconductivity in single-layer iron chalcogenides by chemical pressure,"By substituting S into single-layer FeSe/SrTiO3, chemical pressure is applied
+to tune its paramagnetic state that is modeled as an incoherent superposition
+of spin-spiral states. The resulting electronic bands resemble an ordered
+checkerboard antiferromagnetic structure, consistent with angle-resolved
+photoemission spectroscopy measurements. Scanning tunneling spectroscopy
+reveals a gap evolving from U-shaped for FeSe to V-shaped for FeS with
+decreasing size, attributed to a d-wave superconducting state for which nodes
+emerge once the gap size is smaller than the effective spin-orbit coupling.",2212.13603v2
+2023-03-24,Total Angular Momentum Conservation in Ab Initio Born-Oppenheimer Molecular Dynamics,"We prove both analytically and numerically that the total angular momentum of
+a molecular system undergoing adiabatic Born-Oppenheimer dynamics is conserved
+only when pseudo-magnetic Berry forces are taken into account. This finding
+sheds light on the nature of Berry forces for molecular systems with spin-orbit
+coupling and highlights how ab initio Born-Oppenheimer molecular dynamics
+simulations can successfully capture the entanglement of spin and nuclear
+degrees of freedom as modulated by electronic interactions.",2303.13787v1
+2023-11-22,The layered RuBr$_3$-RuI$_3$ honeycomb system,"The layered RuBr3-RuI3 honeycomb system was synthesized at high-pressures.
+The crystal structures are centrosymmetric (space group R-3), and based on
+honeycomb layers of Ru$^{3+}$ (S=1/2). Their basic physical properties are
+surveyed. The solid solution switches from insulating to metallic in the range
+of concentrations between RuBr$_{0.75}$I$_{2.25}$ and RuBr$_{0.50}$I$_{2.50}$.
+A preliminary structure/property phase diagram is presented. Our results
+suggest that this solid solution may provide insight into the influence of
+disorder on spin-orbit-coupled quantum spin liquids.",2311.13645v1
+2024-02-11,Discrete Time Crystal Phase of Higher Dimensional Integrable Models,"This paper investigates the possibility of generating Floquet-time crystals
+in higher dimensions ($d\geq 2$) through the time-periodic driving of
+integrable free-fermionic models. The realization leads to rigid time-crystal
+phases that are ideally resistant to thermalization and decoherence. By
+utilizing spin-orbit coupling, we are able to realize a robust time-crystal
+phase that can be detected using novel techniques. Moreover, we discuss the
+significance of studying the highly persistent subharmonic responses and their
+implementation in a Kitaev spin liquid, which contributes to our understanding
+of time translational symmetry breaking and its practical implications.",2402.07279v1
+2016-07-04,Low-energy microscopic models for iron-based superconductors: a review,"The development of sensible microscopic models is essential to elucidate the
+normal-state and superconducting properties of the iron-based superconductors.
+Because these materials are mostly metallic, a good starting point is an
+effective low-energy model that captures the electronic states near the Fermi
+level and their interactions. However, in contrast to cuprates, iron-based
+high-$T_{c}$ compounds are multi-orbital systems with Hubbard and Hund
+interactions, resulting in a rather involved 10-orbital lattice model. Here we
+review different minimal models that have been proposed to unveil the universal
+features of these systems. We first review minimal models defined solely in the
+orbital basis, which focus on a particular subspace of orbitals, or solely in
+the band basis, which rely only on the geometry of the Fermi surface. The
+former, while providing important qualitative insight into the role of the
+orbital degrees of freedom, do not distinguish between high-energy and
+low-energy sectors and, for this reason, generally do not go beyond mean-field.
+The latter allow one to go beyond mean-field and investigate the interplay
+between superconducting and magnetic orders as well as Ising-nematic order.
+However, they cannot capture orbital-dependent features like spontaneous
+orbital order. We then review recent proposals for a minimal model that
+operates in the band basis but fully incorporates the orbital composition and
+symmetries of the low-energy excitations. We discuss the results of the
+renormalization group study of such a model, particularly of the interplay
+between superconductivity, magnetism, and spontaneous orbital order, and
+compare theoretical predictions with experiments on iron pnictides and
+chalcogenides. We also discuss the impact of the glide-plane symmetry on the
+low-energy models, highlighting the key role played by the spin-orbit coupling.",1607.00865v2
+1996-05-22,Theory of Magnetocrystalline Anisotropy Energy for Wires and Corrals of Fe adatoms: A Non-Perturbative Theory,"The magnetocrystalline anisotropy energy $E_{anis}$ for free-standing chains
+(quantum wires) and rings (quantum corrals) of Fe-adatoms $N=$(2...48) is
+determined using an electronic tight-binding theory. Treating spin-orbit
+coupling non-perturbatively, we analyze the relationship between the electronic
+structure of the Fe $d$-electrons and $E_{anis}(n_{d})$, for both the chain and
+ring conformations. We find that $E_{anis}(N)$ is larger for wires than for
+rings or infinite monolayers. Generally $E_{anis}(n_{d})$ decreases in chains
+upon increasing $N$, while for rings $E_{anis}(n_{d})$ is essentially
+independent of $N$. For increasing $N$, $E_{anis}(n_{d})$ in corrals approaches
+the results for freestanding monolayers. Small rings exhibit clear odd-even
+oscillations of $E_{anis}(N)$. Within our theoretical framework we are able to
+explain the experimentally observed oscillations of $E_{anis}(n_{d})$ during
+film growth with a period of one monolayer. Finally, a generalization of Hund's
+third rule on spin-orbit coupling to itinerant ferromagnets is proposed.",9605137v1
+1998-04-14,Spin-Landau Orbit Coupling in Units of the Flux Quantum Observed from Zeeman Splitting of a Quantum Wire Array,"In Zeeman spectra of a GaAs-AlGaAs quantum wire array with superlattice
+period lp, the zero-field shift is found to increase in steps of (2 pi hbar/
+e)lp^{-2} at the cyclotron radius Rc ~lp, lp/2, and lp/3. This shift, caused by
+spin-Landau orbit coupling and quantized in units of the flux quantum 2 pi hbar
+/e,is a manifestation of the gauge invariance, and the first observation of the
+flux quantization in a non-superconducting material.The quantum interference
+associated with the phase difference in the quantum barrier scattering is also
+reported.",9804135v1
+1999-01-28,Nonlinear Magneto-Optics of freestanding Fe monolayers from first principles,"The nonlinear magneto-optical Kerr-effect (NOLIMOKE) is determined for
+freestanding Fe monolayers with several in-plane structures from first
+principles. Based on the theory of nonlinear magneto-optics by H\""ubner and
+Bennemann [Phys. Rev. B, {\bf 40}, 5973 (1989)] we calculate the nonlinear
+susceptibilities of the monolayers using the ab initio FLAPW-method WIEN95 with
+the additional implementation of spin-orbit coupling and the calculation of the
+dipole transition matrix elements appropriate for freestanding monolayers. We
+present results for the spectral dependence of the nonlinear susceptibility
+tensor elements and the resulting intensities and Kerr angles. Special
+emphasize is put on the effects of structural changes such as the variation of
+the lattice constant and different surface orientations. The influence of
+spin-orbit coupling on the tensor elements for different magnetization
+directions is presented as well as the azimuthal dependence of the intensities
+generated by several low index surfaces, showing the pronounced sensitivity of
+second harmonic generation to lateral structural changes as well as magnetic
+properties even in the monolayer range.",9901329v1
+2000-03-03,Nonadiabatic noncyclic geometric phase and ensemble average spectrum of conductance in disordered mesoscopic rings with spin-orbit coupling,"We generalize Yang's theory from the U(1) gauge field to the non-Abelian
+$U(1)\times SU(2)_{spin}$ gauge field. Based on this generalization and taking
+into account the geometric Pancharatnam phase as well as an effective
+Aharonov-Bohm (AB) phase in nonadiabatic noncyclic transport, we calculate the
+ensemble average Fourier spectrum of the conductance in disordered mesoscopic
+rings connected to two leads. Our theory can explain the experimental results
+reported by Morpurgo {\sl et al.} [Phys. Rev. Lett. {\bf 80}, 1050 (1998)]
+satisfactorily. In particular, we clarify that the experimentally observed
+splitting, as well as some structure on the sides of the main peak in the
+ensemble average Fourier spectrum, stem from the nonadiabatic noncyclic
+Pancharatnam phase and the effective AB phase, both being dependent on
+spin-orbit coupling.",0003039v2
+2002-11-26,The 3d-electron states in LaMnO3*,"Three fundamentally different electronic structures for 3d electron states in
+LaMnO3, discussed in the current literature, have been presented. We are in
+favour of the localized electron atomic-like crystal-field approach that yields
+the discrete energy spectrum, in the scale of 1 meV, associated with the
+atomic-like states of the Mn3+ ions in contrary to the continuous energy
+spectrum yielded by band theories. In our atomic-like approach the d electrons
+form the highly-correlated electron system 3d4 described by two Hund's rules
+quantum numbers S=2 and L=2. We take into account the spin-orbit coupling,
+Jahn-Teller distortion and formation of the magnetic state. The resulting
+electronic structure is completely different from that presented in the current
+literature. The superiority of our model relies in the fact that it explains
+consistently properties of LaMnO3, the insulating and magnetic ground state and
+thermodynamics, using well-established physical concepts.
+  Keywords: 3d magnetism, Hund's rules, spin-orbit coupling, crystal field,
+LaMnO3 PACS: No: 71.70.Ej : 75.10.Dg : 73.30.-m",0211595v1
+2002-11-28,The 3d-electron states in FeBr2,"The fundamental controversy about the electronic structure for 3d-electron
+states in FeBr2 is discussed. We advocate for the localized electron
+atomic-like many-electron crystal-field approach that yields the discrete
+energy spectrum, in the scale of 1 meV, associated with the atomic-like states
+of the Fe2+ ions in contrary to the (semi-)continuous energy spectrum yielded
+by band theories. In our approach the six d electrons of the Fe2+ ion form the
+highly-correlated atomic-like electron system 3d6 described by two Hund's rules
+quantum numbers S=2 and L=2 with taking into account the spin-orbit coupling.
+The superiority of our model relies in the fact that it explains consistently
+properties of FeBr2, the insulating and the magnetic ground state as well as
+thermodynamics and Raman low-energy spectra, using well-established physical
+concepts.
+  Keywords: 3d magnetism, Hund's rules, spin-orbit coupling, crystal field,
+FeBr2 PACS: No: 75.50.Ee : 71.15.Mb",0211657v1
+2004-03-01,Spin-orbit-induced correlations of the local density of states in two-dimensional electron gas,"We study the local density of states (LDOS) of two-dimensional electrons in
+the presence of spin-orbit (SO) coupling. Although SO coupling has no effect on
+the average density of states, it manifests itself in the correlations of the
+LDOS. Namely, the correlation function acquires two satellites centered at
+energy difference equal to the SO splitting, $2\omega_{SO}$, of the electron
+Fermi surface. For a smooth disorder the satellites are well separated from the
+main peak. Weak Zeeman splitting $\omega_{Z} \ll \omega_{SO}$ in a parallel
+magnetic field causes an anomaly in the shape of the satellites. We consider
+the effect of SO-induced satellites in the LDOS correlations on the shape of
+the correlation function of resonant-tunneling conductances at different
+source-drain biases, which can be measured experimentally. This shape is
+strongly sensitive to the relation between $\omega_{SO}$ and $\omega_{Z}$.",0403057v1
+2004-04-16,Magnetic properties of superconductors with strong spin-orbit coupling,"We study the response of a superconductor with a strong spin-orbit coupling
+on an external magnetic field. The Ginzburg-Landau free energy functional is
+derived microscopically for a general crystal structure, both with and without
+an inversion center, and for an arbitrary symmetry of the superconducting order
+parameter. As a by-product, we obtain the general expressions for the intrinsic
+magnetic moment of the Cooper pairs. It is shown that the Ginzburg-Landau
+gradient energy in a superconductor lacking inversion symmetry has unusual
+structure. The general formalism is illustrated using as an example CePt$_3$Si,
+which is the first known heavy-fermion superconductor without an inversion
+center.",0404407v3
+2004-11-19,Tuning of the Gap in a Laughlin-Bychkov-Rashba Incompressible Liquid,"We report on our investigation of the influence of Bychkov-Rashba spin-orbit
+interaction (SOI) on the incompressible Laughlin state. We find that
+experimentally obtainable values of the spin-orbit coupling strength can induce
+as much as a 25% increase in the quasiparticle-quasihole gap Eg at low magnetic
+fields in InAs, thereby increasing the stability of the liquid state. The
+SOI-modulated enhancement of Eg is also significant for filling factors 1/5 and
+1/7, where the FQH state is usually weak. This raises the intriguing
+possibility of tuning, via the SO coupling strength, the liquid to solid
+transition to much lower densities.",0411524v1
+2005-10-11,Bound states in a 2D short range potential induced by spin-orbit interaction,"We have discovered an unexpected and surprising fact: a 2D axially symmetric
+short-range potential contains {\it infinite} number of the levels of negative
+energy {\it if one takes into account the spin-orbit (SO) interaction.} For a
+shallow well ($m_eU_0R^2/\hbar^2 \ll 1$, where $m_e$ is the effective mass,
+$U_0$ and $R$ are the depth and the radius of the well, correspondingly) and
+weak SO coupling ($|\alpha|m_eR/\hbar \ll 1$, $\alpha$ is the SO coupling
+constant) exactly one two-fold degenerate bound state exists for each value of
+the half-integer moment $j=m+1/2$, and the corresponding binding energy $E_m$
+extremely rapidly decreases with increasing $m$.",0510271v2
+2005-12-22,Localized versus itinerant magnetic moments in Na0.72CoO2,"Based on experimental 59Co-NMR data in the temperature range between 0.1 and
+300 K, we address the problem of the character of the Co 3d-electron based
+magnetism in Na0.7CoO2. Temperature dependent 59Co-NMR spectra reveal different
+Co environments below 300 K and their differentiation increases with decreasing
+temperature. We show that the 23Na- and 59Co-NMR data may consistently be
+interpreted by assuming that below room temperature the Co 3d-electrons are
+itinerant. Their magnetic interaction appears to favor an antiferromagnetic
+coupling, and we identify a substantial orbital contribution corb to the
+d-electron susceptibility. At low temperatures corb seems to acquire some
+temperature dependence, suggesting an increasing influence of spin-orbit
+coupling. The temperature dependence of the spin-lattice relaxation rate
+T1-1(T) confirms significant variations in the dynamics of this electronic
+subsystem between 200 and 300K, as previously suggested. Below 200 K, Na0.7CoO2
+may be viewed as a weak antiferromagnet with TN below 1 K but this scenario
+still leaves a number of open questions.",0512561v1
+2006-01-22,Borderline magnetism in Sr4Ru3O10: Impact of dilute La and Ca doping on itinerant ferromagnetism and metamagnetism,"An investigation of La and Ca doped Sr4Ru3O10, featuring a coexistence of
+interlayer ferromagnetism and intralayer metamagnetism, is presented. La doping
+readily changes magnetism between ferromagnetism and metamagnetism by tuning
+the density of states. It also results in different Curie temperatures for the
+c-axis and the basal plane, highlighting a rare spin-orbit coupling with the
+crystal field states. In contrast, Ca doping enhances the c-axis ferromagnetism
+and the magnetic anisotropy. La doping also induces a dimensional crossover in
+the interlayer transport whereas Ca doping exhibits a tunneling
+magnetoresistance and an extraordinary T3/2-dependence of the resisitivity. The
+drastic changes caused by the dilute doping demonstrate a rare borderline
+magnetism that is delicately linked to the interplay of the density of states
+and spin-orbit coupling.",0601498v1
+2006-09-25,Ion beam induced modification of exchange interaction and spin-orbit coupling in the Co$_2$FeSi Heusler compound,"A Co$_2$FeSi (CFS) film with L2$_1$ structure was irradiated with different
+fluences of 30 keV Ga$^+$ ions. Structural modifications were subsequently
+studied using the longitudinal (LMOKE) and quadratic (QMOKE) magneto-optical
+Kerr effect. Both the coercivity and the LMOKE amplitude were found to show a
+similar behavior upon irradiation: they are nearly constant up to ion fluences
+of $\approx6\times10^{15}$ ion/cm$^2$, while they decrease with further
+increasing fluences and finally vanish at a fluence of $\approx9\times10^{16}$
+ion/cm$^2$, when the sample becomes paramagnetic. However, contrary to this
+behavior, the QMOKE signal nearly vanishes even for the smallest applied
+fluence of $3\times10^{14}$ ion/cm$^2$. We attribute this reduction of the
+QMOKE signal to an irradiation-induced degeneration of second or higher order
+spin-orbit coupling, which already happens at small fluences of 30 keV Ga$^+$
+ions. On the other hand, the reduction of coercivity and LMOKE signal with high
+ion fluences is probably caused by a reduction of the exchange interaction
+within the film material.",0609633v2
+2007-03-10,Imaging transverse electron focusing in semiconducting heterostructures with spin-orbit coupling,"Transverse electron focusing in two-dimensional electron gases (2DEGs) with
+strong spin-orbit coupling is revisited. The transverse focusing is related to
+the transmission between two contacts at the edge of a 2DEG when a
+perpendicular magnetic field is applied. Scanning probe microscopy imaging
+techniques can be used to study the electron flow in these systems. Using
+numerical techniques we simulate the images that could be obtained in such
+experiments. We show that hybrid edge states can be imaged and that the
+outgoing flux can be polarized if the microscope tip probe is placed in
+specific positions.",0703267v2
+1999-01-22,Non-perturbative membrane spin-orbit couplings in M/IIA theory,"Membrane source-probe dynamics is investigated in the framework of the finite
+N-sector DLCQ M theory compactified on a transverse two-torus for an arbitrary
+size of the longitudinal dimension. The non-perturbative two fermion terms in
+the effective action of the matrix theory, the (2+1)-dimensional supersymmetric
+Yang-Mills theory, that are related to the four derivative F^4 terms by the
+supersymmetry transformation are obtained, including the one-loop term and full
+instanton corrections. On the supergravity side, we compute the classical probe
+action up to two fermion terms based on the classical supermembrane formulation
+in an arbitrary curved background geometry produced by source membranes
+satisfying the BPS condition; two fermion terms correspond to the spin-orbit
+couplings for membranes. We find precise agreement between two approaches when
+the background space-time is chosen to be that of the DLCQ M theory, which is
+asymptotically locally Anti-de Sitter.",9901105v3
+1997-08-08,Antisymmetry and channel coupling contributions to the absorption for p + alpha/d + 3He,"To understand recently established empirical p + alpha potentials, RGM
+calculations followed by inversion are made to study contributions of the d +
+3He reaction channels and deuteron distortion effects to the p + alpha
+potential. An equivalent study of the d + 3He potential is also presented. The
+contributions of exchange non-locality to the absorption are simulated by
+including an phenomenological imaginary potential in the RGM. These effects
+alone strongly influence the shape of the imaginary potentials for both p +
+alpha and d + 3He. The potentials local-equivalent to the fully
+antisymmetrised-coupled channels calculations have a significant
+parity-dependence in both real and imaginary components, which for p + alpha is
+qualitatively similar to that found empirically. The effects on the potentials
+of the further inclusion of deuteron distortion are also presented. The
+inclusion of a spin-orbit term in the RGM, adds additional terms to the
+phase-equivalent potential, most notably the comparatively large imaginary
+spin-orbit term found empirically.",9708013v1
+2007-07-10,Extra Current and Integer Quantum Hall Conductance in the Spin-Orbit Coupling System,"We study the extra term of particle current in a 2D k-cubic Rashba spin-orbit
+coupling system and the integer quantization of the Hall conductance in this
+system. We provide a correct formula of charge current in this system and the
+careful consideration of extra currents provides a stronger theoretical basis
+for the theory of the quantum Hall effect which has not been considered before.
+The non-trivial extra contribution to the particle current density and local
+conductivity, which originates from the cubic dependence on the momentum
+operator in the Hamiltonian, will have no effect on the integer quantization of
+the Hall conductance. The extension of Noether's theorem for the 2D k-cubic
+Rashba system is also addressed. The two methods reach to exactly the same
+results.",0707.1472v2
+2007-08-23,Using Josephson junctions to determine the pairing state of superconductors without crystal inversion symmetry,"Theoretical studies of a planar tunnel junction between two superconductors
+with antisymmetric spin-orbit coupling are presented. The half-space Green's
+function for such a superconductor is determined. This is then used to derive
+expressions for the dissipative current and the Josephson current of the
+junction. Numerical results are presented in the case of the Rashba spin-orbit
+coupling, relevant to the much studied compound CePt$_3$Si. Current-voltage
+diagrams, differential conductance and the critical Josephson current are
+presented for different crystallographic orientations and different weights of
+singlet and triplet components of the pairing state. The main conclusion is
+that Josephson junctions with different crystallographic orientations may
+provide a direct connection between unconventional pairing in superconductors
+of this kind and the absence of inversion symmetry in the crystal.",0708.3169v3
+2008-12-09,Jahn-Teller induced Berry phase in spin-orbit coupled Bose-Einstein condensates,"We demonstrate that Berry phases may greatly affect the dynamics of
+spin-orbit coupled Bose-Einstein condensates. The effective model Hamiltonian
+under consideration is shown to be equivalent to the Exe Jahn-Teller model
+first introduced in molecular physics. The corresponding conical intersection
+is identified and the Berry phase acquired for a wave packet encircling the
+intersection studied. It is found that this phase manifests itself in the
+density profile of the condensate, making it a directly measurable quantity via
+time-of-flight detection. Moreover, the non-Abelian gauge structure of the
+system is addressed and we verify how it affects the dynamics.",0812.1725v2
+2009-07-01,Electronic structure of ferromagnetic semiconductor Ga1-xMnxAs probed by sub-gap magneto-optical spectroscopy,"We employ Faraday and Kerr effect spectroscopy in the infrared range to
+investigate the electronic structure of Ga1-xMnxAs near the Fermi energy. The
+band structure of this archetypical dilute-moment ferromagnetic semiconductor
+has been a matter of controversy, fueled partly by previous measurements of the
+unpolarized infrared absorption and their phenomenological impurity-band
+interpretation. The infrared magneto-optical effects we study arise directly
+from the spin-splitting of the carrier bands and their chiral asymmetry due to
+spin-orbit coupling. Unlike the unpolarized absorption, they are intimately
+related to ferromagnetism and their interpretation is much more microscopically
+constrained in terms of the orbital character of the relevant band states. We
+show that the conventional theory of the disordered valence band with dominant
+As p-orbital character and coupled by kinetic-exchange to Mn local moments
+accounts semi-quantitatively for the overall characteristics of the measured
+infrared magneto-optical spectra.",0907.0207v1
+2009-07-02,Control of Josephson current by Aharonov-Casher Phase in a Rashba Ring,"We study the interference effect induced by the Aharonov-Casher phase on the
+Josephson current through a semiconducting ring attached to superconducting
+leads. Using a 1D model that incorporates spin-orbit coupling in the
+semiconducting ring, we calculate the Andreev levels analytically and
+numerically, and predict oscillations of the Josephson current due to the AC
+phase. This result is valid from the point contact limit to the long channel
+length limit, as defined by the ratio of the junction length and the BCS
+healing length. We show in the long channel length limit that the impurity
+scattering has no effect on the oscillation of the Josephson current, in
+contrast to the case of conductivity oscillations in a spin-orbit coupled ring
+system attached to normal leads where impurity scattering reduces the amplitude
+of oscillations. Our results suggest a new scheme to measure the AC phase with,
+in principle, higher sensitivity. In addition, this effect allows for control
+of the Josephson current through the gate voltage tuned AC phase.",0907.0272v1
+2009-08-25,Chiral confinement in quasirelativistic Bose-Einstein condensates,"In the presence of a laser-induced spin-orbit coupling an interacting ultra
+cold spinor Bose-Einstein condensate may acquire a quasi-relativistic character
+described by a non-linear Dirac-like equation. We show that as a result of the
+spin-orbit coupling and the non-linearity the condensate may become
+self-trapped, resembling the so-called chiral confinement, previously studied
+in the context of the massive Thirring model. We first consider 1D geometries
+where the self-confined condensates present an intriguing sinusoidal dependence
+on the inter-particle interactions. We further show that multi-dimensional
+chiral-confinement is also possible under appropriate feasible laser
+arrangements, and discuss the properties of 2D and 3D condensates, which differ
+significantly from the 1D case.",0908.3631v1
+2009-10-26,A theorem for the existence of Majorana fermion modes in spin-orbit-coupled semiconductors,"We prove an index theorem for the existence of Majorana zero modes in a
+semiconducting thin film with a sizable spin-orbit coupling when it is adjacent
+to an s-wave superconductor. The theorem, which is analogous to the
+Jackiw-Rebbi index theorem for the zero modes in mass domain walls in
+one-dimensional Dirac theory, applies to vortices with odd flux quantum in a
+semiconducting film in which s-wave superconductivity and a Zeeman splitting
+are induced by proximity effect. The momentum-space construction of the
+zero-mode solution presented here is complementary to the approximate
+real-space solution of the Bogoliubov-de Gennes equations at a vortex core [J.
+D. Sau et al., arXiv:0907.2239], proving the existence of non-degenerate
+zero-energy Majorana excitations and the resultant non-Abelian topological
+order in the semiconductor heterostructure. With increasing magnitude of the
+proximity-induced pairing potential, the non-Abelian superconducting state
+makes a topological quantum phase transition to an ordinary s-wave
+superconducting state which no topological order.",0910.4763v1
+2009-11-24,"The electronic structure of epitaxially stabilized 5d perovskite Ca_{1-x}Sr_xIrO_3 (x = 0, 0.5, and 1) thin films: the role of strong spin-orbit coupling","We have investigated the electronic structure of meta-stable perovskite
+Ca1-xSrxIrO3 (x = 0, 0.5, and 1) thin films using transport measurements,
+optical spectroscopy, and first-principles calculations. We artificially
+fabricated the perovskite phase of Ca1-xSrxIrO3, which has a hexagonal or post
+perovskite crystal structure in bulk form, by growing epitaxial thin films on
+perovskite GdScO3 substrates using epi-stabilization technique. The transport
+properties of the perovskite Ca1-xSrxIrO3 films systematically changed from
+nearly insulating (or semi-metallic) for x = 0 to bad metallic for x = 1. Due
+to the extended wavefunctions, 5d electrons are usually delocalized. However,
+the strong spin-orbit coupling in Ca1-xSrxIrO3 results in the formation of
+effective total angular momentum Jeff = 1/2 and 3/2 states, which puts
+Ca1-xSrxIrO3 in the vicinity of a metal-insulator phase boundary. As a result,
+the electrical properties of the Ca1-xSrxIrO3 films are found to be sensitive
+to x and strain.",0911.4542v1
+2010-04-27,Probing non-Abelian statistics with Majorana fermion interferometry in spin-orbit-coupled semiconductors,"The list of quantum mechanical systems with non-Abelian statistics has
+recently been expanded by including generic spin-orbit-coupled semiconductors
+e.g., InAs) in proximity to a s-wave superconductor. Demonstration of the
+anyonic statistics using Majorana fermion interferometry in this system is a
+necessary first step towards topological quantum computation (TQC). However,
+since all isolated chiral edges that can be created in the semiconductor are
+charge neutral, it is not clear if electrically controlled interferometry is
+possible in this system. Here we show that when two isolated chiral Majorana
+edges are brought into close contact, the resultant interface supports charge
+current, enabling electrically controlled Majorana fermion interferometry in
+the semiconductor structure. Such interferometry experiments on the
+semiconductor are analogous to similar interferometry experiments on the
+$\nu=5/2$ fractional quantum Hall systems and on the surface of a 3D strong
+topological insulator, illustrating the usefulness of the 2D semiconductor
+heterostructure as a suitable TQC platform. In particular, we proposed Majorana
+interferometers may be the most direct method for establishing non-Abelian
+braiding statistics in topological superconductors.",1004.4702v2
+2010-07-16,"Strain control of magnetic anisotropy in (Ga,Mn)As microbars","We present an experimental and theoretical study of magnetocrystalline
+anisotropies in arrays of bars patterned lithographically into (Ga,Mn)As
+epilayers grown under compressive lattice strain. Structural properties of the
+(Ga,Mn)As microbars are investigated by high-resolution X-ray diffraction
+measurements. The experimental data, showing strong strain relaxation effects,
+are in good agreement with finite element simulations. SQUID magnetization
+measurements are performed to study the control of magnetic anisotropy in
+(Ga,Mn)As by the lithographically induced strain relaxation of the microbars.
+Microscopic theoretical modeling of the anisotropy is performed based on the
+mean-field kinetic-exchange model of the ferromagnetic spin-orbit coupled band
+structure of (Ga,Mn)As. Based on the overall agreement between experimental
+data and theoretical modeling we conclude that the micropatterning induced
+anisotropies are of the magnetocrystalline, spin-orbit coupling origin.",1007.2766v1
+2010-11-29,Majorana End-States in Multi-band Microstructures with Rashba Spin-Orbit Coupling,"A recent work [1] demonstrated, for an ideal spinless p+ip superconductor,
+that Majorana end-states can be realized outside the strict one-dimensional
+limit, so long as: 1) the sample width does not greatly exceed the
+superconducting coherence length and 2) an odd number of transverse sub-bands
+are occupied. Here we extend this analysis to the case of an effective p+ip
+superconductor engineered from Rashba spin-orbit coupled surface with induced
+magnetization and superconductivity, and find a number of new features.
+Specifically, we find that finite size quantization allows Majorana end-states
+even when the chemical potential is outside of the induced Zeeman gap where the
+bulk material would not be topological. This is relevant to proposals utilizing
+semiconducting quantum wires, however, we also find that the bulk energy gap is
+substantially reduced if the induced magnetization is too large. We next
+consider a slightly different geometry, and show that Majorana end-states can
+be created at the ends of ferromagnetic domains. Finally, we consider the case
+of meandering edges and find, surprisingly, that the existence of well-defined
+transverse sub-bands is not necessary for the formation of robust Majorana
+end-states.",1011.6371v1
+2010-12-28,Probing non-Abelian statistics of Majorana fermions in ultracold atomic superfluid,"We propose an experiment to directly probe the non-Abelian statistics of
+Majorana fermions by braiding them in an s-wave superfluid of ultracold atoms.
+We show different orders of braiding operations give orthogonal output states
+that can be distinguished through Raman spectroscopy. Realization of Majorana
+bound states in an s-wave superfluid requires strong spin-orbital coupling and
+a controllable Zeeman field in the perpendicular direction. We present a simple
+laser configuration to generate the artificial spin-orbital coupling and the
+required Zeeman field in the dark state subspace.",1012.5761v2
+2011-01-11,Quantum Anomalous Hall Effect in Single-layer and Bilayer Graphene,"The quantum anomalous Hall effect can occur in single and few layer graphene
+systems that have both exchange fields and spin-orbit coupling. In this paper,
+we present a study of the quantum anomalous Hall effect in single-layer and
+gated bilayer graphene systems with Rashba spin-orbit coupling. We compute
+Berry curvatures at each valley point and find that for single-layer graphene
+the Hall conductivity is quantized at $\sigma_{xy} = 2e^2/h$, with each valley
+contributing a unit conductance and a corresponding chiral edge state. In
+bilayer graphene, we find that the quantized anomalous Hall conductivity is
+twice that of the single-layer case when the gate voltage $U$ is smaller than
+the exchange field $M$, and zero otherwise. Although the Chern number vanishes
+when $U > M$, the system still exhibits a quantized valley Hall effect, with
+the edge states in opposite valleys propagating in opposite directions. The
+possibility of tuning between different topological states with an external
+gate voltage suggests possible graphene-based spintronics applications.",1101.2042v2
+2011-03-16,Spatial correlations in chaotic nanoscale systems with spin-orbit coupling,"We investigate the statistical properties of wave functions in chaotic
+nanostructures with spin-orbit coupling (SOC), focussing in particular on
+spatial correlations of eigenfunctions. Numerical results from a microscopic
+model are compared with results from random matrix theory in the crossover from
+the gaussian orthogonal to the gaussian symplectic ensembles (with increasing
+SOC); one- and two-point distribution functions were computed to understand the
+properties of eigenfunctions in this crossover. It is found that correlations
+of wave function amplitudes are suppressed with SOC; nevertheless,
+eigenfunction correlations play a more important role in the two-point
+distribution function(s), compared to the case with vanishing SOC. Experimental
+consequences of our results are discussed.",1103.3265v1
+2011-05-09,BCS-BEC Crossover and Topological Phase Transition in 3D Spin-Orbit Coupled Degenerate Fermi Gases,"We investigate the BCS-BEC crossover in three dimensional degenerate Fermi
+gases in the presence of spin-orbit coupling (SOC) and Zeeman field. We show
+that the superfluid order parameter destroyed by a large Zeeman field can be
+restored by the SOC. With increasing strengths of the Zeeman field, there is a
+series of topological quantum phase transitions from a non-topological
+superfluid state with fully gapped fermionic spectrum to a topological
+superfluid state with four topologically protected Fermi points (i.e., nodes in
+the quasiparticle excitation gap) and then to a second topological superfluid
+state with only two topologically protected Fermi points. The quasiparticle
+excitations near the Fermi points realize the long-sought low-temperature
+analog of Weyl fermions of particle physics. We show that the topological phase
+transitions can be probed using the experimentally realized momentum resolved
+photoemission spectroscopy.",1105.1796v3
+2011-05-23,Low-lying energy spectrum of the cerium dimer,"The electronic structure of Ce2 is studied in a valence bond model with two
+4f electrons localized at two cerium sites. It is shown that the low-lying
+energy spectrum of the simplest cerium chemical bond is determined by
+peculiarities of the occupied 4f states. The model allows for an analytical
+solution which is discussed along with the numerical analysis. The energy
+spectrum is a result of the interplay between the 4f valence bond exchange, the
+4f Coulomb repulsion and the spin-orbit coupling. The calculated ground state
+is the even \Omega=\Lambda=\Sigma=0 level, the lowest excitations situated at
+30 K are the odd \Omega=\Lambda=\Sigma=0 state and the $^{3} 6_5$ doublet
+(\Omega=\pm5,\, \Lambda=\pm6,\, \Sigma=\mp1). The calculated magnetic
+susceptibility displays different behavior at high and low temperatures. In the
+absence of the spin-orbit coupling the ground state is the ${}^3 \Sigma_g^-$
+triplet. The results are compared with other many-electron calculations and
+experimental data.",1105.4415v2
+2011-05-31,Spin and orbital angular momentum of the tensor gauge field,"Following the recent studies of the trickiness in spin and orbital angular
+momentum of the vector gauge fields, we perform here a parallel analysis for
+the tensor gauge field, which has certain relation to gravitation. Similarly to
+the vector case, we find a nice feature that after removing all gauge degrees
+of freedom the angular momentum of the tensor gauge field vanishes for a
+stationary system. This angular momentum also shows a one-parameter invariance
+over the infinitely many ways of complete gauge fixing for the tensor field.
+The tensor gauge coupling, however, does exhibit a critical difference from the
+vector gauge coupling that it may induce intrinsic interaction terms into the
+spatial translation and rotation generators, leaving none of the ten Poincar\'e
+generators interaction-free.",1105.6300v1
+2011-06-02,Stability of spin-orbit coupled Fermi gases with population imbalance,"We use the self-consistent mean-field theory to analyze the effects of
+Rashba-type spin-orbit coupling (SOC) on the ground-state phase diagram of
+population-imbalanced Fermi gases throughout the BCS-BEC evolution. We find
+that the SOC and population imbalance are counteracting, and that this
+competition tends to stabilize the uniform superfluid phase against the phase
+separation. However, we also show that the SOC stabilizes (destabilizes) the
+uniform superfluid phase against the normal phase for low (high) population
+imbalances. In addition, we find topological quantum phase transitions
+associated with the appearance of momentum space regions with zero
+quasiparticle energies, and study their signatures in the momentum
+distribution.",1106.0473v2
+2011-06-13,Universal phase structure of dilute Bose gases with Rashba spin-orbit coupling,"A Bose gas subject to a light-induced Rashba spin-orbit coupling possesses a
+dispersion minimum on a circle in momentum space; we show that kinematic
+constraints due to this dispersion cause interactions to renormalize to
+universal, angle-dependent values that govern the phase structure in the
+dilute-gas limit. We find that, regardless of microscopic interactions, (a) the
+ground state involves condensation at two opposite momenta, and is, in finite
+systems, a fragmented condensate; and (b) there is a nonzero-temperature
+instability toward the condensation of pairs of bosons. We discuss how our
+results can be reconciled with the qualitatively different mean-field phase
+diagram, which is appropriate for dense gases.",1106.2552v3
+2011-07-15,Renormalization of interactions of ultracold atoms in simulated Rashba gauge fields,"Interactions of ultracold atoms with Rashba spin-orbit coupling, currently
+being studied with simulated (artificial) gauge fields, have nontrivial
+ultraviolet and infrared behavior. Examining the ultraviolet structure of the
+Bethe-Salpeter equation, we show that the linear ultraviolet divergence in the
+bare interaction can be renormalized as usual in terms of low-energy scattering
+lengths, and that for both bosons and fermions ultraviolet logarithmic
+divergences are absent. Calculating the leading order effective interaction
+with full dependence on the spin-orbit coupling strength and the center-of-mass
+momentum of the colliding pair, we elucidate the relation between mean-field
+interactions and physical three-dimensional scattering lengths. As a
+consequence of infrared logarithmic divergences in the two-particle propagator,
+the effective interaction vanishes as the center-of-mass momentum approaches
+zero.",1107.3162v2
+2011-07-20,Weak localization of bulk channels in topological insulator thin film,"Weak antilocalization (WAL) is expected whenever strong spin-orbit coupling
+or scattering comes into play. Spin-orbit coupling in the bulk states of a
+topological insulator is very strong, enough to result in the topological phase
+transition. However, the recently observed WAL in topological insulators seems
+to have an ambiguous origin from the bulk states. Starting from the effective
+model for three-dimensional topological insulators, we find that the lowest
+two-dimensional (2D) bulk subbands of a topological insulator thin film can be
+described by the modified massive Dirac model. We derive the
+magnetoconductivity formula for both the 2D bulk subbands and surface bands.
+Because with Relatively large gap, the 2D bulk subbands may lie in the regimes
+where the unitary behavior or even weak localization (WL) is also expected,
+instead of always WAL. As a result, the bulk states may contribute small
+magnetoconductivity or even compensate the WAL from the surface states.
+Inflection in magnetoconductivity curves may appear when the bulk WL channels
+outnumber the surface WAL channels, providing a signature of the weak
+localization from the bulk states.",1107.3959v2
+2011-08-04,Electronic Liquid Crystalline Phases in a Spin-Orbit Coupled Two-Dimensional Electron Gas,"We argue that the ground state of a two-dimensional electron gas with Rashba
+spin-orbit coupling realizes one of several possible liquid crystalline or
+Wigner crystalline phases in the low-density limit, even for short-range
+repulsive electron-electron interactions (which decay with distance with a
+power larger than 2). Depending on specifics of the interactions, preferred
+ground-states include an anisotropic Wigner crystal with an increasingly
+anisotropic unit cell as the density decreases, a striped or electron smectic
+phase, and a ferromagnetic phase which strongly breaks the lattice point-group
+symmetry, i.e. exhibits nematic order. Melting of the anisotropic Wigner
+crystal or the smectic phase by thermal or quantum fluctuations can gives rise
+to a non-magnetic nematic phase which preserves time-reversal symmetry.",1108.1222v3
+2011-08-22,Quantum phases of atomic Fermi gases with anisotropic spin-orbit coupling,"We consider a general anisotropic spin-orbit coupling (SOC) and analyze the
+phase diagrams of both balanced and imbalanced Fermi gases for the entire
+BCS--Bose-Einstein condensate (BEC) evolution. In the first part, we use the
+self-consistent mean-field theory at zero temperature, and show that the
+topological structure of the ground-state phase diagrams is quite robust
+against the effects of anisotropy. In the second part, we go beyond the
+mean-field description, and investigate the effects of Gaussian fluctuations
+near the critical temperature. This allows us to derive the time-dependent
+Ginzburg-Landau theory, from which we extract the effective mass of the Cooper
+pairs and their critical condensation temperature in the molecular BEC limit.",1108.4263v2
+2011-09-22,Order by Disorder in Spin-Orbit Coupled Bose-Einstein Condensates,"Motivated by recent experiments, we investigate the system of
+isotropically-interacting bosons with Rashba spin-orbit coupling. At the
+non-interacting level, there is a macroscopic ground-state degeneracy due to
+the many ways bosons can occupy the Rashba spectrum. Interactions treated at
+the mean-field level restrict the possible ground-state configurations, but
+there remains an accidental degeneracy not corresponding to any symmetry of the
+Hamiltonian, indicating the importance of fluctuations. By finding analytical
+expressions for the collective excitations in the long-wavelength limit and
+through numerical solution of the full Bogoliubov- de Gennes equations, we show
+that the system condenses into a single momentum state of the Rashba spectrum
+via the mechanism of order by disorder. We show that in 3D the quantum
+depletion for this system is small, while the thermal depletion has an infrared
+logarithmic divergence, which is removed for finite-size systems. In 2D, on the
+other hand, thermal fluctuations destabilize the system.",1109.4945v3
+2011-10-17,Opposite effect of spin-orbit coupling on condensation and superfluidity,"We investigated effects of a Rashba-type spin-orbit coupling (SOC) on the
+condensed density and superfluid density tensor of a two-component Fermi gas in
+the BCS-BEC crossover at zero temperature. In anisotropic three dimensions
+(3D), we found that SOC has an opposite effect on condensation (enhanced) and
+superfluidity (suppressed in the SOC direction) and this effect becomes most
+pronounced for very weak interactions and the SOC strength being larger than a
+characteristic value. Furthermore, as functions of SOC strength, the condensed
+density changes monotonously for all interaction parameters while the
+superfluid density has a minimum when the interaction parameter is below a
+critical value. We also discussed the isotropic two dimensional (2D) case where
+analytical expressions for the gap and number equations were obtained and the
+same phenomena was found as that of the 3D case.",1110.3565v2
+2011-10-26,Tuning the Tricritical Point with Spin-orbit Coupling in Polarized Fermionic Condensates,"We investigate a two-component atomic Fermi gas with population imbalance in
+the presence of Rashba-type spin-orbit coupling (SOC). As a competition between
+SOC and population imbalance, the finite-temperature phase diagram reveals a
+large varieties of new features, including the expanding of the superfluid
+state regime and the shrinking of both the phase separation and the normal
+regimes. For sufficiently strong SOC, the phase separation region disappears,
+giving way to the superfluid state. We find that the tricritical point moves
+toward regime of low temperature, high magnetic field, and high polarization as
+the SOC increases.",1110.5818v2
+2011-12-19,Effects of the Spin-Orbit Coupling and the Superconductivity in simple-cubic alpha-Polonium,"We have investigated the mechanism of stabilizing the simple-cubic (SC)
+structure in polonium (alpha- Po), based on the phonon dispersion calculations
+using the first-principles all-electron band method. We have demonstrated that
+the stable SC structure results from the suppression of the Peierls instability
+due to the strong spin-orbit coupling (SOC) in alpha-Po. Further, we have
+explored the possible superconductivity in alpha-Po, and predicted that it
+becomes a superconductor with Tc ~ 4 K. The transverse soft phonon mode at q ~
+2/3 R, which is greatly influenced by the SOC, plays an important role both in
+the structural stability and the superconductivity in alpha-Po. We have
+discussed effects of the SOC and the volume variation on the phonon dispersions
+and superconducting properties of alpha-Po.",1112.4224v2
+2011-12-27,2D and 3D topological insulators with isotropic and parity-breaking Landau levels,"We investigate topological insulating states in both two and three dimensions
+with the harmonic potential and strong spin-orbit couplings breaking the
+inversion symmetry. Landau-level like quantizations appear with the full 2D and
+3D rotational symmetry and time-reversal symmetry. Inside each band, states are
+labeled by their angular momenta over which energy dispersions are strongly
+suppressed by spin-orbit coupling to nearly flat. The radial quantization
+generates energy gaps between neighboring bands at the order of the harmonic
+frequency. Helical edge or surface states appear on open boundaries
+characterized by the Z2 index. These Hamiltonians can be viewed from the
+dimensional reduction of the high dimensional quantum Hall states in 3D and 4D
+flat spaces. These states can be realized with ultra-cold fermions inside
+harmonic traps with the synthetic gauge fields.",1112.5907v3
+2012-03-03,Interatomic collisions in two-dimensional and quasi-two-dimensional confinements with spin-orbit coupling,"We investigate the low-energy scattering and bound states of two
+two-component fermionic atoms in pure two-dimensional (2D) and quasi-2D
+confinements with Rashba spin-orbit coupling (SOC). We find that the SOC
+qualitatively changes the behavior of the 2D scattering amplitude in the
+low-energy limit. For quasi-2D systems we obtain the analytic expression for
+the effective-2D scattering amplitude and the algebraic equations for the
+two-atom bound state energy. Based on these results, we further derive the
+effective 2D interaction potential between two ultracold atoms in the quasi-2D
+confinement with Rashba SOC. These results are crucial for the control of the
+2D effective physics in quasi-2D geometry via the confinement intensity and the
+atomic three-dimensional scattering length.",1203.0623v3
+2012-03-13,Quantum anomalous Hall effect on star lattice with spin-orbit coupling and exchange field,"We study the star lattice with Rashba spin-orbit coupling and exchange field
+and find that there exists the quantum anomalous Hall effect in this system and
+there are five energy gaps at Dirac points and quadratic band crossing points.
+We calculate the Berry curvature distribution and obtain the Hall conductivity
+(Chern number $\nu$) quantized as integers, and find that $\nu=-1,2,1,1,2$,
+respectively, when the Fermi level lies in these five gaps. Our model can be
+view as a general quantum anomalous Hall system and, in limit cases, can give
+what the honeycomb lattice and kagome lattice gave. We also find there exists a
+nearly flat band with $\nu=1$ which may provide an opportunity to realize the
+fractional quantum anomalous Hall effect. Finally, the chiral edge states on a
+zigzag star lattice are given numerically to confirm the topological property
+of this system.",1203.2855v2
+2012-03-27,Topological thermoelectric effects in spin-orbit coupled electron and hole doped semiconductors,"We compute the intrinsic contributions to the Berry-phase mediated anomalous
+Hall and Nernst effects in electron- and hole-doped semiconductors in the
+presence of an in-plane magnetic field as well as Rashba and Dresselhaus spin
+orbit couplings. For both systems we find that the regime of chemical potential
+which supports the topological superconducting state in the presence of
+superconducting proximity effect can be characterized by plateaus in the
+topological Hall and Nernst coefficients flanked by well-defined peaks marking
+the emergence of the topological regime. The plateaus arise from a clear
+momentum space separation between the region where the Berry curvature is
+peaked (at the `near-band-degeneracy' points) and the region where the single
+(or odd number of) Fermi surface lies in the Brillouin zone. The plateau for
+the Nernst coefficient is at vanishing magnitudes surrounded by two peaks of
+opposite signs as a function of the chemical potential. These results could be
+useful for experimentally deducing the chemical potential regime suitable for
+realizing topological states in the presence of proximity effect.",1203.6109v1
+2012-03-28,Stability of ultracold atomic Bose condensates with Rashba spin-orbit coupling against quantum and thermal fluctuations,"We study the stability of Bose condensates with Rashba-Dresselhaus spin-orbit
+coupling in three dimensions against quantum and thermal fluctuations. The
+ground state depletion of the plane-wave condensate due to quantum fluctuations
+is, as we show, finite, and therefore the condensate is stable. We also
+calculate the corresponding shift of the ground state energy. Although the
+system cannot condense in the absence of interparticle interactions, we show by
+estimating the number of excited particles that interactions stabilize the
+condensate even at non-zero temperature. Unlike in the usual Bose gas, the
+normal phase is not kinematically forbidden at any temperature; calculating the
+free energy of the normal phase at finite temperature, and comparing with the
+free energy of the condensed state, we infer that generally the system is
+condensed at zero temperature, and undergoes a transition to normal at non-zero
+temperature.",1203.6367v2
+2012-06-26,Enhancement of condensate depletion due to spin-orbit coupling,"We show that spin-orbit coupling (SOC) significantly enhances the depletion
+of a homogeneous Bose-Einstein condensate in three dimensions. With decreasing
+anisotropy of the SOC, both the quantum and thermal depletion increase. In
+particular, different types of SOC give rise to qualitatively different
+dependences of the condensate depletion on microscopic variables including the
+scattering length, the strength of the SOC, and the temperature, which can be
+directly observed once these types of SOC are realized in experiments.
+Moreover, we point out that thermal depletion in three dimensions becomes
+logarithmically divergent at any given finite temperature when both the SOC and
+the interaction approach the isotropic limit.",1206.5918v3
+2012-07-12,Near-zero-energy end states in topologically trivial spin-orbit coupled superconducting nanowires with a smooth confinement,"A one-dimensional spin-orbit coupled nanowire with proximity-induced pairing
+from a nearby s-wave superconductor may be in a topological nontrivial state,
+in which it has a zero energy Majorana bound state at each end. We find that
+the topological trivial phase may have fermionic end states with an
+exponentially small energy, if the confinement potential at the wire's ends is
+smooth. The possible existence of such near-zero energy levels implies that the
+mere observation of a zero-bias peak in the tunneling conductance is not an
+exclusive signature of a topological superconducting phase even in the ideal
+clean single channel limit.",1207.3067v1
+2012-08-01,Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor,"The existence of topological superconductors preserving time-reversal
+symmetry was recently predicted, and they are expected to provide a solid-state
+realization of itinerant massless Majorana fermions and a route to topological
+quantum computation. Their first concrete example, CuxBi2Se3, was discovered
+last year, but the search for new materials has so far been hindered by the
+lack of guiding principle. Here, we report point-contact spectroscopy
+experiments showing that the low-carrier-density superconductor
+Sn_{1-x}In_{x}Te is accompanied with surface Andreev bound states which, with
+the help of theoretical analysis, give evidence for odd-parity pairing and
+topological superconductivity. The present and previous finding of topological
+superconductivity in Sn_{1-x}In_{x}Te and CuxBi2Se3 demonstrates that
+odd-parity pairing favored by strong spin-orbit coupling is a common underlying
+mechanism for materializing topological superconductivity.",1208.0059v2
+2012-08-15,Synthetic Spin-Orbit Coupling in Two-level Cold Atoms,"Synthetic spin-orbit coupling (SOC) in controlled quantum systems such as
+cold atoms or trapped ions has been of great interest. Here we show, both
+theoretically and computationally, a simplest realization of SOC using
+two-level cold atoms interacting with only one laser beam. The underlying
+mechanism is based upon the non-adiabatic nature of laser-atom interaction,
+with the Rabi frequency and atom's kinetic energy being comparable to each
+other. We use the Zitterbewegung (ZB) oscillation to further illustrate the
+effects of the synthesized SOC on the quantum dynamics of the two-level cold
+atoms. We expect our proposal to be of experimental interest in quantum
+simulation of SOC-related physics.",1208.3005v1
+2012-08-27,Majorana fermions in one-dimensional spin-orbit coupled Fermi gases,"We theoretically study trapped one-dimensional Fermi gases in the presence of
+spin-orbit coupling induced by Raman lasers. The gas changes from a
+conventional (non-topological) superfluid to a topological superfluid as one
+increases the intensity of the Raman lasers above a critical chemical-potential
+dependent value. Solving the Bogoliubov-de Gennes equations self-consistently,
+we calculate the density of states in real and momentum space at finite
+temperatures. We study Majorana fermions (MFs) which appear at the boundaries
+between topologically trivial and topologically non-trivial regions. We
+linearize the trap near the location of a MF, finding an analytic expression
+for the localized MF wavefunction and the gap between the MF state and other
+edge states.",1208.5450v4
+2012-09-05,Majorana fermions in s-wave noncentrosymmetric superconductor with Rashba and Dresselhaus (110) spin-orbit couplings,"The asymmetric spin-orbit (SO) interactions play a crucial role in realizing
+topological phases in noncentrosymmetric superconductor (NCS).We investigate
+the edge states and the vortex core states in s-wave NCS with Rashba and
+Dresselhaus (110) SO couplings by both numerical and analytical methods. In
+particular, we demonstrate that there exists a novel semimetal phase
+characterized by the flat Andreev bound states in the phase diagram of the
+s-wave Dresselhaus NCS which supports the emergence of Majorana fermion (MF).
+The flat dispersion implies a peak in the density of states which has a clear
+experimental signature in the tunneling conductance measurements and the MFs
+proposed here should be experimentally detectable.",1209.0930v2
+2012-09-13,Ground State Properties of Spin-Orbit Coupled Bose Gases for Arbitrary Interactions,"We develop a field integral formalism to study spin-orbit-coupled (SOC) Bose
+gases with arbitrary interspecies interaction. We identify various features
+arising from the interplay of SOC and interspecies interaction, including a
+roton minimum in the excitation spectrum and dual effects of SOC on
+ground-state energies depending on interspecies interactions.
+Counterintuitively, we find that at low interspecies interaction the SOC
+stabilizes the system by suppressing the quantum depletion. We show that the
+static structure factor is immune to the SOC in the phase space where
+time-reversal symmetry is preserved. Furthermore, we present an alternate way
+of studying phase fluctuations of the system.",1209.2897v2
+2012-10-18,Zitterbewegung effect in spin-orbit coupled spin-1 ultracold atoms,"The Zitterbewegung effect in spin-orbit coupled spin-1 cold atoms is
+investigated in the presence of the Zeeman field and a harmonic trap. It is
+shown that the Zeeman field and the harmonic trap have significant effect on
+the Zitterbewegung oscillatory behaviors. The external Zeeman field could
+suppress or enhance the Zitterbewegung amplitude and change the frequencies of
+oscillation. A much slowly damping Zitterbewegung oscillation can be achieved
+by adjusting both the linear and quadratic Zeeman field. Multi-frequency
+Zitterbewegung oscillation can be induced by the applied Zeeman field. In the
+presence of the harmonic trap, the subpackets corresponding to different
+eigenenergies would always keep coherent, resulting in the persistent
+Zitterbewegung oscillations. The Zitterbewegung oscillation would display very
+complicated and irregular oscillation characteristics due to the coexistence of
+different frequencies of the Zitterbewegung oscillation. Numerical results show
+that, the Zitterbewegung effect is robust even in the presence of interaction
+between atoms.",1210.5030v2
+2012-10-23,g-Tensor Control in Bent Carbon Nanotube Quantum Dots,"We demonstrate gate control of the electronic g-tensor in single and double
+quantum dots formed along a bend in a carbon nanotube. From the dependence of
+the single-dot excitation spectrum on magnetic field magnitude and direction,
+we extract spin-orbit coupling, valley coupling, spin and orbital magnetic
+moments. Gate control of the g-tensor is measured using the splitting of the
+Kondo peak in conductance as a sensitive probe of Zeeman energy. In the double
+quantum dot regime, the magnetic field dependence of the position of
+cotunneling lines in the two dimensional charge stability diagram is used to
+infer the positions of the two dots along the nanotube.",1210.6402v2
+2012-11-02,Majorana Kramers Doublets in $d_{x^2-y^2}$-wave Superconductors with Rashba Spin-Orbit Coupling,"In this work, we show that a quasi-one-dimensional $d_{x^2-y^2}$-wave
+superconductor with Rashba spin-orbit coupling is a DIII class, time-reversal
+invariant, topological superconductor (TS) which supports a Majorana Kramers
+Doublet (MKD) at each end of the TS. A MKD is a pair of Majorana end states
+(MESs) protected by time-reversal symmetry (TRS). An external magnetic field
+breaks TRS and drives the system from DIII to D class in which case a single
+MES appears at each end of the TS. We show that a MKD induces resonant Andreev
+reflection with zero bias conductance peak of $4e^2/h$. Experimental
+realizations of the proposed model are discussed.",1211.0338v2
+2012-11-08,Flow enhanced pairing and other novel effects in Fermi gases in synthetic gauge fields,"Recent experiments on fermions in synthetic gauge fields result in systems
+with a spin-orbit coupling along one spatial axis, a detuning field, and a
+Zeeman field. We show theoretically that the presence of all three results in
+interesting and unusual phenomena in such systems in the presence of a contact
+singlet attraction between the fermions (described by a scattering length). For
+two particles, bound states appear over certain range of the centre of mass
+momenta when a critical positive scattering length is attained, with the
+deepest bound state appearing at a nonzero centre of mass momentum. For the
+centre of mass momenta without a bound state, the gauge field induces a
+resonance like feature in the scattering continuum resulting in a large
+scattering phase shift. For many particles, we demonstrate that the system, in
+a parameter range, shows flow enhanced pairing, i.e., a more robust superfluid
+at finite centre of mass momentum. Yet another regime of parameters offers the
+opportunity to study strongly interacting normal states of spin-orbit coupled
+fermionic systems utilizing the resonance like feature induced by the synthetic
+gauge field.",1211.1831v1
+2012-11-16,Topological superfluid phases of an atomic Fermi gas with in- and out-of-plane Zeeman fields and equal Rashba-Dresselhaus spin-orbit coupling,"We analyze the effects of in- and out-of-plane Zeeman fields on the BCS-BEC
+evolution of a Fermi gas with equal Rashba-Dresselhaus (ERD) spin-orbit
+coupling (SOC). We show that the ground state of the system involves novel
+gapless superfluid phases that can be distinguished with respect to the
+topology of the momentum-space regions with zero excitation energy. For the
+BCS-like uniform superfluid phases with zero center-of-mass momentum, the zeros
+may correspond to one or two doubly-degenerate spheres, two or four spheres,
+two or four concave spheroids, or one or two doubly-degenerate circles,
+depending on the combination of Zeeman fields and SOC. Such changes in the
+topology signal a quantum phase transition between distinct superfluid phases,
+and leave their signatures on some thermodynamic quantities. We also analyze
+the possibility of Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like nonuniform
+superfluid phases with finite center-of-mass momentum and obtain an even richer
+phase diagram.",1211.4020v3
+2012-11-25,Unconventional superfluid in a two-dimensional Fermi gas with anisotropic spin-orbit coupling and Zeeman fields,"We study the phase diagram of a two-dimensional ultracold Fermi gas with the
+synthetic spin-orbit coupling (SOC) that has recently been realized at NIST.
+Due to the coexistence of anisotropic SOC and effective Zeeman fields in the
+NIST scheme, the system shows rich structure of phase separation involving
+exotic gapless superfluid and Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing
+states with different center-of-mass momentum. In particular, we characterize
+the stability region of FFLO states and demonstrate their unique features under
+SOC. We then show that the effective transverse Zeeman field in the NIST scheme
+can qualitatively change the landscape of the thermodynamic potential which
+leads to intriguing effects such as the disappearance of pairing instability,
+the competition between different FFLO states, and the stabilization of a fully
+gapped FFLO state. These interesting features may be probed for example by
+measuring the in-situ density profiles or by the momentum-resolved
+radio-frequency spectroscopy.",1211.5780v3
+2012-12-05,Non-Fermi liquid and topological states with strong spin-orbit coupling,"We argue that a class of strongly spin-orbit coupled materials, including
+some pyrochlore iridates and the inverted band gap semiconductor HgTe, may be
+described by a minimal model consisting of the Luttinger Hamiltonian
+supplemented by Coulomb interactions, a problem studied by Abrikosov and
+collaborators. It contains two-fold degenerate conduction and valence bands
+touching quadratically at the zone center. Using modern renormalization group
+methods, we update and extend Abrikosov's classic work and show that
+interactions induce a quantum critical non-Fermi liquid phase, stable provided
+time-reversal and cubic symmetries are maintained. We determine the universal
+power-law exponents describing various observables in this ""Luttinger Abrikosov
+Beneslavskii"" state, which include conductivity, specific heat,non-linear
+susceptibility and magnetic Gruneisen number. Furthermore, we determine the
+phase diagram in the presence of cubic and/or time-reversal symmetry breaking
+perturbations, which includes topological insulator and Weyl semi-metal phases.
+Many of these phases possess an extraordinarily large anomalous Hall effect,
+with the Hall conductivity scaling sub-linearly with magnetization.",1212.1168v1
+2012-12-12,Electron correlation and spin-orbit coupling effects in US3 and USe3,"A systematic density functional theory (DFT)+U study is conducted to
+investigate the electron correlation and spin-orbit coupling (SOC) effects in
+US3 and USe3. Our calculations reveal that inclusion of the U term is essential
+to get energy band gaps for them, indicating the strong correlation effects for
+uranium 5f electrons. Taking consideration of the SOC effect results in small
+reduction on the electronic band gaps of US3 and USe3, but largely changes the
+energy band shapes around the Fermi energy. As a result, US3 has a direct band
+gap while USe3 has an indirect one. Our calculations predict that both US3 and
+USe3 are antiferromagnetic insulators, in agreement with corresponding
+experimental results. Based on our DFT+U calculations, we systematically
+present the ground-state electronic, mechanical, and Raman properties for US3
+and USe3.",1212.2682v1
+2013-01-08,Tuning thermoelectric power factor by crystal-field and spin-orbit couplings in Kondo lattice materials,"We study thermoelectric transport at low temperatures in correlated Kondo
+insulators, motivated by the recent observation of a high thermoelectric figure
+of merit(ZT) in $FeSb_2$ at $T \sim 10 K$. Even at room temperature,
+correlations have the potential to lead to high ZT, as in $YbAl_3$, one of the
+most widely used thermoelectric metals. At low temperature correlation effects
+are especially worthy of study because fixed band structures are unlikely to
+give rise to the very small energy gaps $E_g \sim 5 kT$ necessary for a weakly
+correlated material to function efficiently at low temperature. We explore the
+possibility of improving the thermoelectric properties of correlated Kondo
+insulators through tuning of crystal field and spin-orbit coupling and present
+a framework to design more efficient low-temperature thermoelectrics based on
+our results.",1301.1441v1
+2013-01-18,Manipulating Majorana fermions in one-dimensional spin-orbit coupled atomic Fermi gases,"Majorana fermions are promising candidates for storing and processing
+information in topological quantum computation. The ability to control such
+individual information carriers in trapped ultracold atomic Fermi gases is a
+novel theme in quantum information science. However, fermionic atoms are
+neutral and thus are difficult to manipulate. Here, we theoretically
+investigate the control of emergent Majorana fermions in one-dimensional
+spin-orbit coupled atomic Fermi gases. We discuss (i) how to move Majorana
+fermions by increasing or decreasing an effective Zeeman field, which acts like
+a solid state control voltage gate; and (ii) how to create a pair of Majorana
+fermions by adding a magnetic impurity potential. We discuss the experimental
+realization of our control scheme in an ultracold Fermi gas of $^{40}$K atoms.",1301.4303v1
+2013-01-20,Impurity probe of topological superfluid in one-dimensional spin-orbit coupled atomic Fermi gases,"We investigate theoretically non-magnetic impurity scattering in a
+one-dimensional atomic topological superfluid in harmonic traps, by solving
+self-consistently the microscopic Bogoliubov-de Gennes equation. In sharp
+contrast to topologically trivial Bardeen-Cooper-Schrieffer \textit{s}-wave
+superfluid, topological superfluid can host a mid-gap state that is bound to
+localized non-magnetic impurity. For strong impurity scattering, the bound
+state becomes universal, with nearly zero energy and a wave-function that
+closely follows the symmetry of that of Majorana fermions. We propose that the
+observation of such a universal bound state could be a useful evidence for
+characterizing the topolgoical nature of topological superfluids. Our
+prediction is applicable to an ultracold resonantly-interacting Fermi gas of
+$^{40}$K atoms with spin-orbit coupling confined in a two-dimensional optical
+lattice.",1301.4619v1
+2013-01-29,Phase Diagram of a Spin-Orbit Coupled Fermi Gases in a Bilayer Optical Lattice,"We investigate the stability of helical superfluid phase in a spin-orbit
+coupled Fermi gas loaded in a bilayer optical lattice. The phase diagram of the
+system is constructed in the mean field framework. We investigate the
+topological properties of the superfluid phases by a nontrivial application of
+the Fermi surface topological invariant to our time-reversal invariant system
+with degeneracies on the Fermi surface. We find that there is a first-order
+phase boundary in the phase diagram of half filling case and the superfluid
+phases are all topological trivial. The superfluid phase is topological
+nontrivial when the filling fraction deviates from the half filling. In the
+topological nontrivial superfluid phase, a full pairing gap exists in the bulk
+and gapless helical Majorana edge states exist at the boundary.",1301.6871v1
+2013-03-14,Aharonov-Bohm conductance of a disordered single-channel quantum ring,"We study the effect of weak disorder on tunneling conductance of a
+single-channel quantum ring threaded by magnetic flux. We assume that
+temperature is higher than the level spacing in the ring and smaller than the
+Fermi energy. In the absence of disorder, the conductance shows sharp dips
+(antiresonances) as a function of magnetic flux. We discuss different types of
+disorder and find that the short-range disorder broadens antiresonances, while
+the long-range one leads to arising of additional resonant dips. We demonstrate
+that the resonant dips have essentially non-Lorentzian shape. The results are
+generalized to account for the spin-orbit interaction which leads to splitting
+of the disorder-broadened resonant dips, and consequently to coexisting of two
+types of oscillations (both having the form of sharp dips): Aharonov-Bohm
+oscillations with magnetic flux and Aharonov-Casher oscillations with the
+strength of the spin-orbit coupling. We also discuss the effect of the Zeeman
+coupling.",1303.3486v1
+2013-03-18,Non-Abelian Gauge Fields in Photonic Cavities and Photonic Superfluids,"We show that the interplay between the structure anisotropy and the energy
+splitting between the TE and TM modes of a microcavity leads to the appearance
+of a gauge field for a propagating polariton condensate. This field is analog
+with a spin-orbit coupling and the field texture can be tuned by rotating the
+sample and ranges continuously from a Rashba to a monopolar field. In the
+linear regime, the monopolar field leads to a remarkable focusing effect. In
+the interacting regime, the effective spin-orbit coupling induces a breakdown
+of superfluidity. The spatially homogeneous flows become unstable and
+dynamically evolve into textured ground states such as stripes and domain
+walls.",1303.4286v4
+2013-04-03,Vortex states and Majorana fermions in spin-orbit coupled semiconductor-superconductor hybrid structures,"We study the energy spectrum of a vortex core in a two-dimensional
+semiconductor with Rashba spin-orbit interaction and proximity-coupled to a
+conventional superconductor and a ferromagnetic insulator. We perform
+self-consistent calculations using the microscopic tight-binding Bogoliubov-de
+Gennes method on a lattice and confirm the existence of Majorana fermions in
+the non-trivial topological phase. We also find two different topologically
+trivial bulk superconducting phases, only differing in the type of vortex core
+structure they support and separated by a zero-energy excitation. Furthermore,
+we find an asymmetry in the energy spectrum with respect to both Zeeman
+splitting and vortex rotation direction and explain its physical origin.",1304.0981v2
+2013-04-05,Magnetic monopoles and synthetic spin-orbit coupling in Rydberg macrodimers,"We show that sizeable Abelian and non-Abelian gauge fields arise in the
+relative motion of two dipole-dipole interacting Rydberg atoms. Our system
+exhibits two magnetic monopoles for adiabatic motion in one internal two-atom
+state. These monopoles occur at a characteristic distance between the atoms
+that is of the order of one micron. The deflection of the relative motion due
+to the Lorentz force gives rise to a clear signature of the effective magnetic
+field. In addition, we consider non-adiabatic transitions between two
+near-degenerate internal states and show that the associated gauge fields are
+non-Abelian. We present quantum mechanical calculations of this synthetic
+spin-orbit coupling and show that it realizes a velocity-dependent
+beamsplitter.",1304.1597v2
+2013-04-05,Matter-wave dark solitons and their excitation spectra in spin-orbit coupled Bose-Einstein condensates,"We present three types of dark solitons in quasi-one-dimensional spin-orbit
+coupled repulsive Bose-Einstein condensates. Among these families, two are
+always stable, while the third one is only stable sufficiently close to the
+linear regime. The solitons' excitation spectra reveal the potential existence
+of a second anomalous mode. While the first such mode describes the soliton
+oscillatory motion in a parabolic trap, the second, when present, reflects the
+double well structure of the underlying single-particle spectrum. This novel
+mode results in moving density stripes in the vicinity of the soliton core, or
+in an out-of-phase oscillation of the constituent components, with little
+effect on the nearly stationary striped total density of the composite soliton.",1304.1742v2
+2013-05-03,Supercurrent and dynamical instability of spin-orbit-coupled ultracold Bose gases,"We investigate the stability of supercurrents in a Bose-Einstein condensate
+with one-dimensional spin-orbit and Raman couplings. The consequence of the
+lack of Galilean invariance is explicitly discussed. We show that in the
+plane-wave phase, characterized by a uniform density, the supercurrent state
+can become dynamically unstable, the instability being associated with the
+occurrence of a complex sound velocity, in a region where the effective mass is
+negative. We also discuss the emergence of energetic instability in these
+supercurrent states. We argue that both the dynamical and the energetic
+instabilities in these systems can be generated experimentally through
+excitation of the collective dipole oscillation.",1305.0645v2
+2013-05-08,Tuning the electronic properties of J_eff=1/2 correlated semimetal in epitaxial perovskite SrIrO3,"We investigated the electronic properties of epitaxially stabilized
+perovskite SrIrO3 and demonstrated the effective strain-control on its
+electronic structure. Comprehensive transport measurements showed that the
+strong spin-orbit coupling renders a novel semimetallic phase for the J_eff=1/2
+electrons rather than an ordinary correlated metal, elucidating the nontrivial
+mechanism underlying the dimensionality-controlled metal-insulator transition
+in iridates. The electron-hole symmetry of this correlated semimetal was found
+to exhibit drastic variation when subject to bi-axial strain. Under compressive
+strain, substantial electron-hole asymmetry is observed in contrast to the
+tensile side, where the electron and hole effective masses are comparable,
+illustrating the susceptivity of the J_eff=1/2 to structural distortion.
+Tensile strain also shrinks the Fermi surface, indicative of an increasing
+degree of correlation which is consistent with optical measurements. These
+results pave a pathway to investigate and manipulate the electronic states in
+spin-orbit-coupled correlated oxides, and lay the foundation for constructing
+5d transition metal heterostructures.",1305.1732v1
+2013-05-08,Magnetic Exchange Coupling and Anisotropy of 3d Transition-Metal Nanowire on the Surface of Graphyne Sheet,"Using density functional theory plus Hubbard-U (DFT+U) approach, we find that
+quasi one-dementation(1D) 3d transition metal(TM) zigzag nanowire can be
+constructed by TM adsorbed on the surface of graphyne sheet. The results show
+that the TM exchange coupling of the zigzag nanowire mediated by sp hybridized
+carbon atoms gives rise to long range ferromagnetic order except for Cr with
+anti-ferromagnetic order. The magnetic exchange interaction of TM chains
+follows like-Zener's p_z-d exchange mechanism: the coexistence of out-of plane
+p_z-d and in-plane p_x-y-d exchange. Finally, by including spin-orbit
+interactions within spin-DFT, we calculate the magnetic anisotropy energy of
+the TM chain on graphyne. We find that the Fe and Co chains show considerable
+magnetic anisotropy energy (MAE) and orbital magnetic moment. The easy axis of
+V, Cr, Mn and Fe chains is perpendicular to the surface, whereas the easy axis
+of Co lies in the surface. Moreover, only V chain shows relatively larger
+in-plane anisotropy. Our results open a new route to realize the applications
+of graphyne in spintronics.",1305.1791v2
+2013-05-16,"Anomalous Josephson current, incipient time-reversal symmetry breaking, and Majorana bound states in interacting multi-level dots","We study the combined effects of spin-orbit interaction, magnetic field, and
+Coulomb charging on the Josephson current-phase relation, I(\varphi), for a
+multi-level quantum dot tunnel-contacted by two conventional s-wave
+superconductors with phase difference \varphi. A general model is formulated
+and analyzed in the cotunneling regime (weak tunnel coupling) and in the deep
+subgap limit, fully taking into account interaction effects. We determine the
+conditions for observing a finite anomalous supercurrent I_a=I(\varphi=0). For
+a two-level dot with spin-orbit coupling and arbitrarily weak Zeeman field B,
+we find the onset behavior I_a\propto {\rm sgn}(B) in the presence of
+interactions, suggesting the incipient spontaneous breakdown of time-reversal
+symmetry. We also provide conditions for realizing spatially separated (but
+topologically unprotected) Majorana bound states in this system, which have a
+clear signature in the 2\pi-periodic current-phase relation.",1305.3816v2
+2013-05-21,Complex-Stripe Phases Induced by Staggered Rashba Spin-Orbit Coupling,"We study superconducting phases in a quasi-two-dimensional multilayer system
+without local inversion symmetry. Broken local inversion symmetry induces
+layer-dependent Rashba-type spin-orbit couplings. We find that a complex-stripe
+phase, which is the intermediate phase between the Fulde-Ferrell (FF) phase and
+Larkin-Ovchinnikov (LO) phase, is realized in the magnetic field applied
+parallel to the layers. A crossover from the FF phase to the LO phase appears
+by tuning temperature and magnetic field. We show the local density of states
+that characterizes the complex-stripe phase. As a possible realization of the
+complex-stripe phase, we discuss the artificial superlattices of CeCoIn_5.",1305.4748v2
+2013-05-28,Probing Majorana Flat Bands in Nodal $d_{x^2-y^2}$-wave Superconductors with Rashba Spin-Orbit Coupling,"We show that Majorana fermions associated with Majorana flat bands emerge as
+zero energy modes on the [110] edge of single layer or multilayer nodal
+superconductors with $d_{x^2-y^2}$-wave pairing and Rashba spin-orbit coupling.
+Moreover, as long as the global inversion symmetry of the single layer or
+multilayer superconductor is broken, and in the presence of an in-plane
+magnetic field parallel to the [110] edge, the Majorana fermions together with
+usual fermionic Andreev bound states induce a triple-peak structure in
+tunnelling spectroscopy experiments. Importantly, we show that the zero bias
+conductance peak is induced by Majorana fermions. Therefore, tunnelling
+spectroscopy can be used to probe Majorana fermions in nodal $d_{x^2-y^2}$-wave
+superconductors.",1305.6446v1
+2013-05-29,Helical edge states induced by lateral spin-orbit coupling,"The presence of edges locally breaks the inversion symmetry of
+heterostructures and gives rise to lateral (edge) spin-orbit coupling (SOC),
+which, under some conditions, can lead to the formation of helical edge states.
+If the edge SOC is strong enough, the helical edge states can penetrate the
+band-gap and be energetically isolated from the bulk-like states. As a result
+backward scattering is suppressed, dissipationless helical edge channels
+protected against time-inversion symmetric perturbations emerge, and the system
+behaves as a 2D topological insulator (TI). However, unlike in previous works
+on TIs, the mechanism proposed here for the creation of protected helical edge
+states relies on the strong edge SOC rather than on band inversion.",1305.6953v2
+2013-06-27,Rashbon condensation in a Bose gas with Rashba spin-orbit coupling,"We show that in a two-component Bose gas with Rashba spin-orbit coupling
+(SOC) two atoms can form bound states (Rashbons) with any intra-species
+scattering length. At zero center-of-mass momentum there are two degenerate
+Rashbons due to time-reversal symmetry, but the degeneracy is lifted at finite
+in-plane momentum with two different effective masses. A stable Rashbon
+condensation can be created in a dilute system with weakly attractive
+intra-species and repulsive inter-species interactions. The critical
+temperature of Rashbon condensation is about six times smaller than the BEC
+transition temperature of an ideal Bose gas. Due Rashba SOC, excitations in the
+Rashbon condensation phase are anisotropic in momentum space.",1306.6440v3
+2013-12-04,"Comment on ""Quantum Quasicrystals of Spin-Orbit-Coupled Dipolar Bosons""","In a recent Letter, Gopalakrishnan, Martin, and Demler [Phys. Rev. Lett. 111
+(2013) 185304] show that quasi-two-dimensional dipolar Bose gases, subject to a
+Rashba spin-orbit coupling, exhibit a variety of spatially ordered, or
+crystalline, ground states, including a pentagonal quasicrystal. Indeed, as the
+authors say, realizing quasicrystalline condensates would provide new ways to
+explore the physics of quasicrystals, and in particular to study the quantum
+dynamics of their unique collective phason modes. Yet, the authors conclude
+that ""there are typically additional phasons in quantum-mechanical
+quasicrystals, when compared with their classical equivalents."" In this Comment
+I review the notion of phason modes in quasicrystals, and explain why their
+number does not depend on whether they are classical or quantum.",1312.1388v1
+2013-12-08,Theoretical prediction of the importance of the 3B2 state in the dynamics of sulfur dioxide,"While, the sulfur dioxide molecule has been extensively studied over the last
+decades, its photoexcitation dynamics is still unclear, due to its complexity,
+combining conical intersections and spin-orbit coupling between a manifold of
+states. We present for the first time a comprehensive ab initio study of the
+intersystem crossing of the molecule in the low energy domain, based on a
+wave-packet propagation on the manifold of the lowest singlet and triplet
+states. Furthermore, spin-orbit couplings are evaluated on a geometry-dependent
+grid, and diabatized along with the different conical intersections. Our
+results show for the first time the primordial role of the triplet $^3$B$_2$
+state which has not been discussed before, giving new insights into the
+dynamics of the intersystem crossing in $SO_2$.",1312.2275v1
+2013-12-20,Spin-orbit coupling and weak antilocalization in thermoelectric material $β$-K$_{2}$Bi$_{8}$Se$_{13}$,"We have studied the effect of spin-orbital coupling (SOC) on electronic
+transport properties of the thermoelectric material
+$\beta$-K$_{2}$Bi$_{8}$Se$_{13}$ via magnetoresistance (MR) measurements. We
+found that the strong SOC in this material results in weak antilocalization
+(WAL) effect, which can be well described by the three-dimensional weak
+localization model. The phase coherence length extracted from theoretical
+fitting exhibits a power-law temperature dependence with an exponent around
+2.1, indicating that the electron phase dephasing is governed by electron -
+transverse phonon interactions. Like in topological insulators, the WAL effect
+in $\beta$-K$_{2}$Bi$_{8}$Se$_{13}$ can be quenched by magnetic impurities (Mn)
+but is robust against non-magnetic impurities (Te). Although our
+magnetotransport studies do not provide any evidences for topological surface
+states, our analyses suggest that SOC plays an important role in determining
+thermoelectric properties of $\beta$-K$_{2}$Bi$_{8}$Se$_{13}$.",1312.6091v1
+2013-12-23,Josephson Effect and Triplet--Singlet Ratio of Non--centrosymmetric Superconductors,"We calculate the Andreev bound states and the corresponding Josephson current
+for an asymmetric 2-dimensional Josephson junction by solving
+Bogoliubov-de-Gennes equations. The junction consists of a non-centrosymmetric
+superconductor (NCS) separated by a tunneling barrier with a variable height to
+a conventional s-wave superconductor. In addition to the antisymmetric
+spin-orbit coupling in the NCS on the one side, this asymmetric junction gives
+rise to a Rashba spin-orbit coupling at the interface. We explore the rich
+parameter space and recover various limiting cases such as s-wave/p-wave
+junction and the asymmetric s-wave junctions. In addition, we report a
+transition from a 0-junction to a pi/2-junction with increasing triplet-singlet
+pairing ratio of the NCS, which serves as a novel mechanism to determine the
+unknown ratio in a variety of NCS's.",1312.6548v1
+2013-12-24,Non-analytic behavior of the Casimir force across a Lifshitz transition in a spin-orbit coupled material,"We propose the Casimir effect as a general method to observe Lifshitz
+transitions in electron systems. The concept is demonstrated with a planar
+spin-orbit coupled semiconductor in a magnetic field. We calculate the Casimir
+force between two such semiconductors and between the semiconductor and a metal
+as a function of the Zeeman splitting in the semiconductor. The Zeeman field
+causes a Fermi pocket in the semiconductor to form or collapse by tuning the
+system through a topological Lifshitz transition. We find that the Casimir
+force experiences a kink at the transition point and noticeably different
+behaviors on either side of the transition. The simplest experimental
+realization of the proposed effect would involve a metal-coated sphere
+suspended from a micro-cantilever above a thin layer of InSb (or another
+semiconductor with large $g$-factor). Numerical estimates are provided and
+indicate that the effect is well within experimental reach.",1312.6754v1
+2014-01-18,Axionic Antiferromagnetic Insulator Phase in a Correlated and Spin-Orbit Coupled System,"We study theoretically a three-dimensional correlated and spin-orbit coupled
+system, the half-filled extended Fu-Kane-Mele-Hubbard model on a diamond
+lattice, focusing on the topological magnetoelectric response of the
+antiferromagnetic insulator phase. In the antiferromagnetic insulator phase,
+the Dirac-like low-energy effective Hamiltonian is obtained. Then the theta
+term, which results in the magnetoelectric response, is derived as a
+consequence of the chiral anomaly. The realization of the dynamical axion field
+in our model is discussed. The relation with a symmetry broken phase induced by
+interactions in lattice quantum chromodynamics is also discussed.",1401.4523v3
+2014-02-20,Fully Gapped s-wave-like Superconducting State and Electronic Structures in the Ir0.95Pd0.05Te2 Single Crystals with Strong Spin-orbital Coupling,"Due to the large spin-orbital coupling in the layered 5d-transition metal
+chalcogenides compound, the occurrence of superconductivity in Ir2-xPdxTe2
+offers a good chance to search for possible topological superconducting states
+in this system. We did comprehensive studies on the superconducting properties
+and electronic structures of single crystalline Ir0.95Pd0.05Te2 samples. The
+superconducting gap size, critical fields and coherence length along different
+directions were experimentally determined. Macroscopic bulk measurements and
+microscopic low temperature scanning tunneling spectroscopy results suggest
+that Ir0.95Pd0.05Te2 possesses a BCS-like s-wave state. No sign of zero bias
+conductance peak were found in the vortex core at 0.4K.",1402.4858v1
+2014-07-11,Thermodynamic Properties of Rashba Spin-Orbit-Coupled Fermi Gas,"We investigate the thermodynamic properties of a superfluid Fermi gas subject
+to Rashba spin-orbit coupling and effective Zeeman field. We adopt a T-matrix
+scheme that takes beyond-mean-field effects, which are important for strongly
+interacting systems, into account. We focus on the calculation of two important
+quantities: the superfluid transition temperature and the isothermal
+compressibility. Our calculation shows very distinct influences of the
+out-of-plane and the in-plane Zeeman fields on the Fermi gas. We also confirm
+that the in-plane Zeeman field induces a Fulde-Ferrell superfluid below the
+critical temperature and an exotic finite-momentum pseudo-gap phase above the
+critical temperature.",1407.3203v3
+2014-07-13,Berezinskii-Kosterlitz-Thouless Phase Transition in 2D Spin-Orbit Coupled Fulde-Ferrell Superfluids,"The experimental observation of traditional Zeeman-field induced
+Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) superfluids has been hindered by
+various challenges, in particular, the requirement of low dimensional systems.
+In 2D, finite temperature phase fluctuations lead to extremely small
+Berezinskii-Kosterlitz-Thouless (BKT) transition temperature for FFLO
+superfluids, raising serious concerns regarding their experimental
+observability. Recently, it was shown that FFLO superfluids can be realized
+using a Rashba spin-orbit coupled Fermi gas subject to Zeeman fields, which may
+also support topological excitations such as Majorana fermions in 2D. Here we
+address the finite temperature BKT transition issue in this system, which may
+exhibit gapped, gapless, topological, and gapless topological FF phases. We
+find a large BKT transition temperature due to large effective superfluid
+densities, making it possible to observe 2D FF superfluids at finite
+temperature. In addition, we show that gapless FF superfluids can be stable due
+to their positive superfluid densities. These findings pave the way for the
+experimental observation of 2D gapped and gapless FF superfluids and their
+associated topological excitations at finite temperature.",1407.3483v3
+2014-07-28,Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled $s$-wave superconductors,"Majorana fermion (MF) excitations in solid state system have non-Abelian
+statistics which is essential for topological quantum computation. Previous
+proposals to realize MF, however, generally requires fine-tuning of parameters.
+Here we explore a platform which avoids the fine-tuning problem, namely a
+ferromagnetic chain deposited on the surface of a spin-orbit coupled $s$-wave
+superconductor. We show that it generically supports zero-energy topological MF
+excitations near the two ends of the chain with minimal fine-tuning. Depending
+on the strength of the ferromagnetic moment in the chain, the number of MFs at
+each end, $n$, can be either one or two, and should be revealed by a robust
+zero-bias peak (ZBP) of height $2ne^2/h$ in scanning tunneling microscopy (STM)
+measurements which would show strong (weak) signals at the ends (middle) of the
+chain. The role of an approximate chiral symmetry which gives an integer
+topological invariant to the system is discussed.",1407.7519v2
+2014-09-03,Thermal Phase Transitions of Strongly Correlated Bosons with Spin-Orbit Coupling,"Experiments on ultracold atomic gases have begun to explore lattice effects
+and thermal fluctuations for two-component bosons with spin-orbit coupling
+(SOC). Motivated by this, we study a $tJ$ model of strongly correlated lattice
+bosons, with equal Rashba-Dresselhaus SOC and a uniform magnetic field. At zero
+temperature, a Gutzwiller ansatz is shown to capture lattice variants of stripe
+superfluid (SF) ground states. We formulate a finite temperature generalization
+of the Gutzwiller approach and show that thermal fluctuations in the doped Mott
+insulator drive a two-step melting of the stripe SF, revealing a wide
+intermediate regime of a normal fluid with stripe order.",1409.1216v3
+2014-09-12,Toroidal order in a partially disordered state on a layered triangular lattice: implication to UNi4B,"A partial disorder on a layered triangular lattice is theoretically
+investigated from a viewpoint of toroidal ordering and magnetoelectric effects.
+We consider an extended periodic Anderson model including a site-dependent
+antisymmetric spin-orbit coupling between conduction and localized electrons.
+We show that, by the mean-field approximation, the model exhibits a coplanar
+vortex-lattice-type magnetic order as observed in a hexagonal uranium compound
+UNi4B, in the parameter region with intermediate hybridization and electron
+correlation. This peculiar state accommodates a toroidal order, which leads to
+the linear magnetoelectric effect. We discuss the implications of our results
+to UNi4B, focusing on the possible source of the site-dependent antisymmetric
+spin-orbit coupling.",1409.3657v1
+2014-09-24,Interaction-induced quantum anomalous Hall phase in (111) bilayer of LaCoO$_3$,"In the present paper, the Gutzwiller density functional theory (LDA+G) has
+been applied to study a bilayer system of LaCoO$_3$ grown along the $(111)$
+direction on SrTiO$_3$. The LDA calculations show that there are two nearly
+flat bands located at the top and bottom of $e_{g}$ bands of Co atoms with the
+Fermi level crossing the lower one, which is almost half-filled. After
+including both the spin-orbit coupling and the Coulomb interaction in the LDA+G
+method, we find that the interplay between spin-orbit coupling and Coulomb
+interaction stabilizes a very robust ferromagnetic insulator phase with
+non-zero Chern number, which indicates the possibility to realize quantum
+anomalous Hall effect in this system.",1409.6797v2
+2014-10-14,Majorana Bound States in Proximity Junctions of Superconducting Nanowires with Dresselhaus Spin-orbit Coupling,"We theoretically study transport properties of nanowires with the Dresselhaus
+[110] spin-orbit coupling under the in-plane Zeeman potential and the
+proximity-induced s-wave pair potential. In the topologically nontrivial phase,
+the nanowire hosts the Majorana fermions at its edges and the number of the
+Majorana bound states is equal to the number propagating channels (Nc). When we
+attach a normal metal to the superconductor, such Majorana bound states
+penetrate into the dirty normal segment and form the Nc resonant transmission
+channels there. We show that chiral symmetry of the electronic states protects
+the Majorana bound states at the zero energy even in the presence of
+impurities. As a result, we find that the zero-bias conductance of
+normal-nanowire/superconducting-nanowire junctions is quantized at 2e2Nc/h
+independent of the random potentials.",1410.3626v1
+2014-10-16,Goos-Hänchen shifts in spin-orbit-coupled cold atoms,"We consider a matter wave packet of cold atom gas impinging upon a step
+potential created by the optical light field. In the presence of spin-orbit
+(SO) coupling, the atomic eigenstates contain two types of evanescent states,
+one of which is the ordinary evanescent state with pure imaginary wave vector
+while the other possesses complex wave vector and is recognized as oscillating
+evanescent state. We show that the presence and interplay of these two types of
+evanescent states can give rise to two different mechanisms for total internal
+reflection (TIR), and thus lead to unusual Goos-H\""anchen (GH) effect. As a
+result, not only large positive but also large negative GH shift can be
+observed in the reflected atomic beam. The dependence of the GH shift on the
+incident angle, energy and height of the step potential is studied numerically.",1410.4283v2
+2014-10-20,Probing the Flat Band of Optically-Trapped Spin-Orbital Coupled Bose Gases Using Bragg Spectroscopy,"Motivated by the recent efforts in creating the flat band in ultracold atomic
+systems, we investigate how to probe the flat band in an optically-trapped
+spin-orbital coupled Bose-Einstein condensate using Bragg spectroscopy. We have
+found that the excitation spectrum and the dynamic structure factor of the
+condensate alter dramatically, when the band structure exhibits various level
+of flatness. In particular, when the band exhibits perfect flatness around the
+band minima corresponding to a near infinite effective mass, a quadratic
+dispersion emerges in the low-energy excitation spectrum; in sharp contrast,
+for the opposite case when an ordinary band is present, the familiar linear
+dispersion arises. Such linear-to-quadratic crossover in the energy spectrum
+presents a striking manifestation of the transition of an ordinary band into a
+flat band, thereby allows the direct probe of the flat band by using Bragg
+spectroscopy.",1410.5142v3
+2014-11-26,Structured Weyl Points in Spin-Orbit Coupled Fermionic Superfluids,"We demonstrate that a Weyl point, widely examined in 3D Weyl semimetals and
+superfluids, can develop a pair of non-degenerate gapless spheres. Such a
+bouquet of two spheres is characterized by three distinct topological
+invariants of manifolds with full energy gaps, i.e., the Chern number of a 0D
+point inside one developed sphere, the winding number of a 1D loop around the
+original Weyl point, and the Chern number of a 2D surface enclosing the whole
+bouquet. We show that such structured Weyl points can be realized in the
+superfluid quasiparticle spectrum of a 3D degenerate Fermi gas subject to
+spin-orbit couplings and Zeeman fields, which supports Fulde-Ferrell
+superfluids as the ground state.",1411.7316v4
+2015-01-19,Electronic correlations in Hund metals,"To clarify the nature of correlations in Hund metals and its relationship
+with Mott physics we analyze the electronic correlations in multiorbital
+systems as a function of intraorbital interaction U, Hund's coupling JH and
+electronic filling n. We show that the main process behind the enhancement of
+correlations in Hund metals is the suppression of the double-occupancy of a
+given orbital, as it also happens in the Mott-insulator at half-filling.
+However, contrary to what happens in Mott correlated states the reduction of
+the quasiparticle weight Z with JH can happen on spite of increasing charge
+fluctuations. Therefore, in Hund metals the quasiparticle weight and the mass
+enhancement are not good measurements of the charge localization. Using simple
+energetic arguments we explain why the spin polarization induced by Hund's
+coupling produces orbital decoupling. We also discuss how the behavior at
+moderate interactions, with correlations controlled by the atomic spin
+polarization, changes at large $U$ and $J_H$ due to the proximity to a Mott
+insulating state.",1501.04607v2
+2015-02-03,Spin-orbit coupled j=1/2 iridium moments on the geometrically frustrated fcc lattice,"Motivated by experiments on the double perovskites La2ZnIrO6 and La2MgIrO6,
+we study the magnetism of spin-orbit coupled j=1/2 iridium moments on the
+three-dimensional, geometrically frustrated, face-centered cubic lattice. The
+symmetry-allowed nearest-neighbor interaction includes Heisenberg, Kitaev, and
+symmetric off-diagonal exchange. A Luttinger-Tisza analysis shows a rich
+variety of orders, including collinear A-type antiferromagnetism, stripe order
+with moments along the [111]-direction, and incommensurate non-coplanar
+spirals, and we use Monte Carlo simulations to determine their magnetic
+ordering temperatures. We argue that existing thermodynamic data on these
+iridates underscores the presence of a dominant Kitaev exchange, and also
+suggest a resolution to the puzzle of why La2ZnIrO6 exhibits `weak'
+ferromagnetism, but La2MgIrO6 does not.",1502.01031v4
+2015-02-12,A new material for probing spin-orbit coupling in Iridates,"We report the structure and magnetic properties of a new iridate compound,
+SrxLa11-xIr4O24, where the d-electron count of Ir and therefore its number of
+unpaired electrons can be tuned continuously from 5d5 Ir4+ to 5d4 Ir5+, i.e.
+from SrLa10Ir4O24 to Sr5La6Ir4O24. The IrO6 octahedra in SrxLa11-xIr4O24 are
+isolated from each other and from other transition elements, minimizing band
+effects, and the doping is on the framework sites, not the Ir sites, minimizing
+the effects of disorder. Measurements of the temperature dependent magnetic
+susceptibility are employed to determine the evolution of the Ir magnetic
+moment on progressing from 5d5 Ir4+ to 5d4 Ir5+, and are clearly best described
+by a transition from a J=1/2 to a J=0 Ir magnetic state; that is, the evolution
+of the magnetic susceptibility shows the dominance of spin-orbit coupling in
+determining the magnetic properties of a material with highly isolated IrO6
+octahedra.",1502.03833v2
+2015-02-19,Positive and negative mass solitons in spin-orbit coupled Bose-Einstein condensates,"We present a unified description of different types of matter-wave solitons
+that can emerge in quasi one-dimensional spin-orbit coupled (SOC) Bose-Einstein
+condensates (BECs). This description relies on the reduction of the original
+two-component Gross-Pitaevskii SOC-BEC model to a single nonlinear
+Schr\""{o}dinger equation, via a multiscale expansion method. This way, we find
+approximate bright and dark soliton solutions, for attractive and repulsive
+interatomic interactions respectively, for different regimes of the SOC
+interactions. Beyond this, our approach also reveals ""negative mass"" regimes,
+where corresponding ""negative mass"" bright or dark solitons can exist for
+repulsive or attractive interactions, respectively. Such a unique opportunity
+stems from the structure of the excitation spectrum of the SOC-BEC. Numerical
+results are found to be in excellent agreement with our analytical predictions.",1502.05574v1
+2015-03-23,Conductance spectroscopy of topological superconductor wire junctions,"We study the zero-temperature transport properties of one-dimensional
+normal-superconductor (NS) junctions with topological superconductors across
+their topological transitions. Working within the Blonder-Tinkham-Klapwijk
+(BTK) formalism generalized for topological NS junctions, we analytically
+calculate the differential conductance for tunneling into two models of a
+topological superconductor: a spinless intrinsic $p$-wave superconductor and a
+spin-orbit-coupled $s$-wave superconductor in a Zeeman field. In both cases we
+verify that the zero-bias conductance is robustly quantized at $2e^2/h$ in the
+topological regime, while it takes nonuniversal values in the non-topological
+phase. The conductance spectra in the topological state develops a peak at zero
+bias for certain parameter regimes, with the peak width controlled by the
+strength of spin-orbit coupling and barrier transparency.",1503.06801v3
+2015-04-08,Unidirectional sub-diffraction waveguiding based on optical spin-orbit coupling in subwavelength plasmonic waveguides,"Subwavelength plasmonic waveguides show the unique ability of strongly
+localizing (down to the nanoscale) and guiding light. These structures are
+intrinsically two-way optical communication channels, providing two opposite
+light propagation directions. As a consequence, when light is coupled to these
+planar integrated devices directly from the top (or bottom) surface using
+strongly focused beams, it is equally shared into the two opposite propagation
+directions. Here, we show that symmetry can be broken by using incident
+circularly polarized light, on the basis of a spin-orbital angular momentum
+transfer directly within waveguide bends. We predict that up to 94 \% of the
+incoupled light is directed into a single propagation channel of a gap plasmon
+waveguide. Unidirectional propagation of strongly localized optical energy, far
+beyond the diffraction limit, becomes switchable by polarization, with no need
+of intermediate nano-antennas/scatterers as light directors. This study may
+open new perspectives in a large panel of scientific domains, such as
+nanophotonic circuitry, routing and sorting, optical nanosensing, nano-optical
+trapping and manipulation.",1504.02038v3
+2015-04-18,Asymmetric Landau bands due to spin-orbit coupling,"We show that the Landau bands obtained in a two-dimensional lateral
+semiconductor superlattice with spin-orbit coupling (SOC) of the
+Rashba/Dresselhaus type, linear in the electron momentum, placed in a tilted
+magnetic field, do not follow the symmetry of the spatial modulation. Moreover,
+this phenomenology is found to depend on the relative tilt of magnetic field
+and on the SOC type: a) when only Rashba SOC exists and the magnetic field is
+tilted in the direction of the superlattice b) Dresselhaus SOC exists and the
+magnetic field is tilted in the direction perpendicular to the superlattice.
+Consequently, measurable properties of the modulated system become anisotropic
+in a tilted magnetic field when the field is conically rotated around the $z$
+axis, at a fixed polar angle, as we demonstrate by calculating the resistivity
+and the magnetization.",1504.04699v2
+2015-05-18,Quasiclassical analysis of vortex lattice states in Rashba noncentrosymmetric superconductors,"Vortex lattice states occurring in noncentrosymmetric superconductors with
+the spin-orbit coupling of Rashba type under a magnetic field parallel to the
+symmetry plane are examined by assuming the $s$-wave pairing case and in an
+approach combining the quasiclassical theory with the Landau level expansion of
+the superconducting order parameter. The resulting field-temperature phase
+diagrams include not only a discontinuous transition but a continuous crossover
+between different vortex lattice structures, and, further, a critical end point
+of a structural transition line is found in an intermediate field and at a low
+temperature in the present approach. It is pointed out that the strange field
+dependence of the vortex lattice structure is a consequence of that of an
+anisotropy stemming from the Rashba spin-orbit coupling, and that the critical
+end point is related to the helical phase modulation peculiar to these
+materials in the ideal Pauli-limited case. Further, calculation results on the
+local density of states detectable in STM experiments are also presented.",1505.04559v2
+2015-05-21,Topological superconductivity in a multichannel Yu-Shiba-Rusinov chain,"Chains of magnetic atoms placed on the surface of an s-wave superconductor
+with large spin-orbit coupling provide a promising platform for the realization
+of topological superconducting states characterized by the presence of Majorana
+zero-energy modes. In this work we study the properties of the one-dimensional
+chain of Yu-Shiba-Rusinov states induced by magnetic impurities using a
+realistic model for the magnetic atoms that include the presence of multiple
+scattering channels. These channels are mixed by the spin-orbit coupling and,
+via the hybridization of the Yu-Shiba-Rusinov states at different sites of the
+chain, result in a multi-band structure for the chain. We obtain the
+topological phase diagram for such band structure. We identify the parameter
+regimes for which the different bands lead to a topological phase and show that
+the inclusion of higher bands can greatly enlarge the phase space for the
+realization of topological states.",1505.05862v2
+2015-05-22,Vector solitons in a spin-orbit coupled spin-$2$ Bose-Einstein condensate,"Five-component minimum-energy bound states and mobile vector solitons of a
+spin-orbit-coupled quasi-one-dimensional hyperfine-spin-2 Bose-Einstein
+condensate are studied using the numerical solution and variational
+approximation of a mean-field model. Two distinct types of solutions with
+single-peak and multi-peak density distribution of the components are
+identified in different domains of interaction parameters. From an analysis of
+Galilean invariance and time-reversal symmetry of the Hamiltonian, we establish
+that vector solitons with multi-peak density distribution preserve
+time-reversal symmetry, but cannot propagate maintaining the shape of
+individual components. However, those with single-peak density distribution
+violate time-reversal symmetry of the Hamiltonian, but can propagate with a
+constant velocity maintaining the shape of individual components.",1505.06190v2
+2015-06-10,Topological nodal line semimetals with and without spin-orbital coupling,"We theoretically study three-dimensional topological semimetals (TSMs) with
+nodal lines protected by crystalline symmetries. Compared with TSMs with point
+nodes, e.g., Weyl semimetals and Dirac semimetals, where the conduction and the
+valence bands touch at discrete points, in these new TSMs the two bands cross
+at closed lines in the Brillouin zone. We propose two new classes of symmetry
+protected nodal lines in the absence and in the presence of spin-orbital
+coupling (SOC), respectively. In the former, we discuss nodal lines that are
+protected by the combination of inversion symmetry and time-reversal symmetry;
+yet unlike any previously studied nodal lines in the same symmetry class, each
+nodal line has a $Z_2$ monopole charge and can only be created (annihilated) in
+pairs. In the second class, with SOC, we show that a nonsymmorphic symmetry
+(screw axis) protects a four-band crossing nodal line in systems having both
+inversion and time-reversal symmetries.",1506.03449v3
+2015-06-22,Edge states and topological insulating phases generated by curving a nanowire with Rashba spin-orbit coupling,"We prove that curvature effects in low-dimensional nanomaterials can promote
+the generation of topological states of matter by considering the paradigmatic
+example of quantum wires with Rashba spin-orbit coupling, which are
+periodically corrugated at the nanometer scale. The effect of the periodic
+curvature generally results in the appearance of insulating phases with a
+corresponding novel butterfly spectrum characterized by the formation of fine
+measure complex regions of forbidden energies. When the Fermi energy lies in
+the gaps, the system displays localized end states protected by topology. We
+further show that for certain corrugation periods the system possesses
+topologically non-trivial insulating phases at half-filling. Our results
+suggest that the local curvature and the topology of the electronic states are
+inextricably intertwined in geometrically deformed nanomaterials.",1506.06676v1
+2015-07-06,Spin-orbit coupled ultracold gases in optical lattices: High-band physics and insufficiency of tight-binding models,"We study the interplay effect of spin-orbit coupling(SOC) and optical lattice
+to the single-particle physics and superfluid-insulator transition in ultracold
+Fermi gases. We consider the type of SOC that has been realized in cold atoms
+experiments via two-photon Raman processes. Our analyses are based on the
+knowledge of full single-particle spectrum in lattices, without relying on any
+tightbinding approximation.We evaluate existing tight-binding models and point
+out their limitations in predicting the correct single-particle physics due to
+the missed high-band contributions. Moreover, we show that the Raman field
+(creating SOC) can induce band-gap closing in a two-dimensional optical
+lattice, leading to the intriguing phenomenon of superfluidity-reentrance for
+interacting fermions at integer filling. We present the superfluid-insulator
+phase diagram in a wide parameter regime of chemical potentials and Raman
+fields. All these results are far beyond any tight-binding model can predict,
+and can be directly probed in current cold atoms experiments.",1507.01341v4
+2015-09-14,Stable Solitons in Three Dimensional Free Space: Self-Trapped Bose-Einstein Condensates with Spin-Orbit Coupling,"By means of variational methods and systematic numerical analysis, we
+demonstrate the existence of stable solitons in three-dimensional (3D) free
+space, in the context of binary atomic condensates combining contact
+self-attraction and spin-orbit coupling, which can be engineered by available
+experimental techniques. Depending on the relative strength of the intra- and
+inter-component attraction, the stable solitons feature a semi-vortex or
+mixed-mode structure. In spite of the fact that the local cubic self-attraction
+gives rise to the supercritical collapse in 3D, the solitons are stable against
+random perturbations, motion, and collisions.",1509.04087v2
+2015-10-07,Cavity optomagnonics with spin-orbit coupled photons,"We experimentally implement a system of cavity optomagnonics, where a sphere
+of ferromagnetic material supports whispering gallery modes (WGMs) for photons
+and the magnetostatic mode for magnons. We observe pronounced nonreciprocity
+and asymmetry in the sideband signals generated by the magnon-induced Brillouin
+scattering of light. The spin-orbit coupled nature of the WGM photons, their
+geometric birefringence and the time-reversal symmetry breaking in the magnon
+dynamics impose the angular-momentum selection rules in the scattering process
+and account for the observed phenomena. The unique features of the system may
+find interesting applications at the crossroad between quantum optics and
+spintronics.",1510.01837v4
+2015-10-15,Symmetry-protected topological phase in a one-dimensional correlated bosonic model with a synthetic spin-orbit coupling,"By performing large-scale density-matrix renormalization group simulations,
+we investigate a one-dimensional correlated bosonic lattice model with a
+synthetic spin-orbit coupling realized in recent experiments. In the insulating
+regime, this model exhibits a symmetry-protected topological phase. This
+symmetry-protected topological phase is stabilized by time-reversal symmetry
+and it is identified as a Haldane phase. We confirm our conclusions further by
+analyzing the entanglement spectrum. In addition, we find four conventional
+phases: a Mott insulating phase with no long range order, a ferromagnetic
+superfluid phase, a ferromagnetic insulating phase and a density-wave phase.",1510.04554v2
+2015-10-22,The energy level crossing behavior and quantum Fisher information in a quantum well with spin-orbit coupling,"We study the energy level crossing behavior in two-dimensional quantum well
+with the Rashba and Dresselhaus spin-orbit couplings (SOCs). By mapping the SOC
+Hamiltonian onto an anisotropic Rabi model, we obtain the approximate ground
+state and its quantum Fisher information (QFI) via performing a unitary
+transformation. We find that the energy level crossing can occur in the quantum
+well system within the available parameters rather than in cavity and circuit
+quantum eletrodynamics systems. Futhermore, the influence of two kinds of SOCs
+on the QFI is investigated and an intuitive explanation from the viewpoint of
+the stationary perturbation theory is given.",1510.06491v1
+2015-10-22,Quantum capacitance in monolayers of silicene and related buckled materials,"Silicene and related buckled materials are distinct from both the
+conventional two dimensional electron gas and the famous graphene due to strong
+spin orbit coupling and the buckled structure. These materials have potential
+to overcome limitations encountered for graphene, in particular the zero band
+gap and weak spin orbit coupling. We present a theoretical realization of
+quantum capacitance which has advantages over the scattering problems of
+traditional transport measurements. We derive and discuss quantum capacitance
+as a function of the Fermi energy and temperature taking into account
+electron-hole puddles through a Gaussian broadening distribution. Our predicted
+results are very exciting and pave the way for future spintronic and
+valleytronic devices.",1510.06614v1
+2016-01-06,Valley detection using a graphene gradual pn junction with spin-orbit coupling: an analytical conductance calculation,"Graphene pn junction is the brick to build up variety of graphene
+nano-structures. The analytical formula of the conductance of graphene gradual
+pn junctions in the whole bipolar region has been absent up to now. In this
+paper, we analytically calculated that pn conductance with the spin-orbit
+coupling and stagger potential taken into account. Our analytical expression
+indicates that the energy gap causes the conductance to drop a constant value
+with respect to that without gap in a certain parameter region, and manifests
+that the curve of the conductance versus the stagger potential consists of two
+Gaussian peaks -- one valley contributes one peak. The latter feature allows
+one to detect the valley polarization without using double-interface resonant
+devices.",1601.01275v1
+2016-01-15,Topological Superfluidity of Spin-Orbit Coupled Bilayer Fermi Gases,"Topological superfluid, new quantum matter that possesses gapless exotic
+excitations known as Majorana fermions, has attracted extensive attention
+recently. These excitations, which can encode topological qubits, could be
+crucial ingredients for fault-tolerant quantum computation. However, creating
+and manipulating multiple Majorana fermions remain an ongoing challenge.
+Loading a topologically protected system in multi-layer structures would be a
+natural and simple way to achieve this goal. Here we investigate the system of
+bilayer Fermi gases with spin-orbit coupling and show that the topological
+condition is significantly influenced by the inter-layer tunneling, yielding
+two novel topological phases, which support more Majorana Fermions. We
+demonstrate the existence of such novel topological phases and associated
+multiple Majorana fermions using bilayer Fermi gases trapped inside a harmonic
+potential. This research pave a new way for generating multiple Majorana
+fermions and would be a significant step towards topological quantum
+computation.",1601.03914v1
+2016-02-07,"Electronic structures of transition metal dipnictides $XPn_2$ ($X$=Ta, Nb; $Pn$=P, As, Sb)","The electronic structures and topological properties of transition metal
+dipnictides $XPn_2$ ($X$=Ta, Nb; $Pn$=P, As, Sb) have been systematically
+studied using first-principles calculations. In addition to small bulk Fermi
+surfaces, the band anticrossing features near the Fermi level can be identified
+from band structures without spin-orbit coupling, leading to nodal lines in all
+these compounds. Inclusion of spin-orbit coupling gaps out these nodal lines
+leaving only a pair of disentangled electron/hole bands crossing the Fermi
+level. Therefore, the low energy physics can be in general captured by the
+corresponding two band model with several isolated small Fermi pockets.
+Detailed analysis of the Fermi surfaces suggests that the arsenides and
+NbSb$_2$ are nearly compensated semimetals while the phosphorides and TaSb$_2$
+are not. Based on the calculated band parities, the electron and hole bands are
+found to be weakly topological non-trivial giving rise to surface states. As an
+example, we presented the surface-direction-dependent band structure of the
+surfaces states in TaSb$_2$.",1602.02344v2
+2016-02-22,Giant Optical Polarization Rotation Induced by Spin-Orbit Coupling in Polarons,"We have uncovered a giant gyrotropic magneto-optical response for doped
+ferromagnetic manganite La2/3Ca1/3MnO3 around the near room-temperature
+paramagnetic-to-ferromagnetic transition. At odds with current wisdom, where
+this response is usually assumed to be fundamentally fixed by the electronic
+band structure, we point to the presence of small polarons as the driving force
+for this unexpected phenomenon. We explain the observed properties by the
+intricate interplay of mobility, Jahn-Teller effect and spin-orbit coupling of
+small polarons. As magnetic polarons are ubiquitously inherent to many strongly
+correlated systems, our results provide an original, general pathway towards
+the generation of gigantic gyrotropic responses that can be harnessed for
+nonreciprocal devices that exploit the polarization of light.",1602.06875v1
+2016-06-03,Superconductivity in FeSe thin films driven by the interplay between nematic fluctuations and spin-orbit coupling,"The origin of the high-temperature superconducting state observed in FeSe
+thin films, whose phase diagram displays no sign of magnetic order, remains a
+hotly debated topic. Here we investigate whether fluctuations arising due to
+the proximity to a nematic phase, which is observed in the phase diagram of
+this material, can promote superconductivity. We find that nematic fluctuations
+alone promote a highly degenerate pairing state, in which both $s$-wave and
+$d$-wave symmetries are equally favored, and $T_{c}$ is consequently
+suppressed. However, the presence of a sizable spin-orbit coupling or inversion
+symmetry-breaking at the film interface lifts this harmful degeneracy and
+selects the $s$-wave state, in agreement with recent experimental proposals.
+The resulting gap function displays a weak anisotropy, which agrees with
+experiments in monolayer FeSe and intercalated Li$_{1-x}$(OH)$_{x}$FeSe.",1606.01170v2
+2016-06-27,Superfluidity in the absence of kinetics in spin-orbit-coupled optical lattices,"At low temperatures bosons typically condense to minimize their
+single-particle kinetic energy while interactions stabilize superfluidity.
+Optical lattices with artificial spin-orbit coupling challenge this paradigm
+because here kinetic energy can be quenched in an extreme regime where the
+single-particle band flattens. To probe the fate of superfluidity in the
+absence of kinetics we construct and numerically solve interaction-only
+tight-binding models in flat bands. We find that novel superfluid states arise
+entirely from interactions operating in quenched kinetic energy bands, thus
+revealing a distinct and unexpected condensation mechanism. Our results have
+important implications for the identification of quantum condensed phases of
+ultracold bosons beyond conventional paradigms.",1606.08439v2
+2016-06-30,Stability of Emergent Kinetics in Optical Lattices with Artificial Spin-Orbit Coupling,"Artificial spin-orbit coupling in optical lattices can be engineered to tune
+band structure into extreme regimes where the single-particle band flattens
+leaving only inter-particle interactions to define many-body states of matter.
+Lin et al. [Phys. Rev. Lett 112, 110404 (2014)] showed that under such
+conditions interactions lead to a Wigner crystal of fermionic atoms under
+approximate conditions: no bandwidth or band mixing. The excitations were shown
+to possess emergent kinetics with fractionalized charge derived entirely from
+interactions. In this work we use numerical exact diagonalization to study a
+more realistic model with non-zero bandwidth and band mixing. We map out the
+stability phase diagram of the Wigner crystal. We find that emergent properties
+of the Wigner crystal excitations remain stable for realistic experimental
+parameters. Our results validate the approximations made by Lin et al. and
+define parameter regimes where strong interaction effects generate emergent
+kinetics in optical lattices.",1607.00001v2
+2016-07-15,Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS$_2$,"We demonstrate clear weak anti-localization (WAL) effect arising from induced
+Rashba spin-orbit coupling (SOC) in WS$_2$-covered single-layer and bilayer
+graphene devices. Contrary to the uncovered region of a shared single-layer
+graphene flake, WAL in WS$_2$-covered graphene occurs over a wide range of
+carrier densities on both electron and hole sides. At high carrier densities,
+we estimate the Rashba SOC relaxation rate to be $\sim 0.2 \rm{ps}^{-1}$ and
+show that it can be tuned by transverse electric fields. In addition to the
+Rashba SOC, we also predict the existence of a `valley-Zeeman' SOC from
+first-principles calculations. The interplay between these two SOC's can open a
+non-topological but interesting gap in graphene; in particular, zigzag
+boundaries host four sub-gap edge states protected by time-reversal and
+crystalline symmetries. The graphene/WS$_2$ system provides a possible platform
+for these novel edge states.",1607.04647v1
+2016-07-24,Harmonic trap resonance enhanced synthetic atomic spin-orbit coupling,"Spin-orbit coupling (SOC) plays an essential role in many exotic and
+interesting phenomena in condensed matter physics. In neutral-atom-based
+quantum simulations, synthetic SOC constitutes a key enabling element. The
+strength of SOC realized so far is limited by various reasons or constraints.
+This work reports tunable SOC synthesized with a gradient magnetic field (GMF)
+for atoms in a harmonic trap. Nearly ten-fold enhancement is observed when the
+GMF is modulated near the harmonic-trap resonance in comparison with free-space
+atoms. A theory is developed that well explains the experimental results. Our
+work offers a clear physical insight into and analytical understanding of how
+to tune the strength of atomic SOC synthesized with GMF using harmonic trap
+resonance.",1607.07005v1
+2016-07-27,Isothermal anisotropic magnetoresistance in antiferromagnetic metallic IrMn,"Antiferromagnetic spintronics is an emerging field; antiferromagnets can
+improve the functionalities of ferromagnets with higher response times, and
+having the information shielded against external magnetic field. Moreover, a
+large list of aniferromagnetic semiconductors and metals with N\'eel
+temperatures above room temperature exists. In the present manuscript, we
+persevere in the quest for the limits of how large can anisotropic
+magnetoresistance be in antiferromagnetic materials with very large spin-orbit
+coupling. We selected IrMn as a prime example of first-class moment (Mn) and
+spin-orbit (Ir) combination. Isothermal magnetotransport measurements in an
+antiferromagnetic-metal(IrMn)/ferromagnetic-insulator thin film bilayer have
+been performed. The metal/insulator structure with magnetic coupling between
+both layers allows the measurement of the modulation of the transport
+properties exclusively in the antiferromagnetic layer. Anisotropic
+magnetoresistance as large as 0.15 % has been found, which is much larger than
+that for a bare IrMn layer. Interestingly, it has been observed that
+anisotropic magnetoresistance is strongly influenced by the field cooling
+conditions, signaling the dependence of the found response on the formation of
+domains at the magnetic ordering temperature.",1607.07999v1
+2016-09-07,Emerging magnetism and anomalous Hall effect in iridate-manganite heterostructures,"Strong Coulomb repulsion and spin-orbit coupling are known to give rise to
+exotic physical phenomena in transition metal oxides. Initial attempts to
+investigate systems where both of these fundamental interactions are comparably
+strong, such as 3d and 5d complex oxide superlattices, have revealed properties
+that only slightly differ from the bulk ones of the constituent materials.
+Here, we observe that the interfacial coupling between the 3d antiferromagnetic
+insulator SrMnO3 and the 5d paramagnetic metal SrIrO3 is enormously strong,
+yielding an anomalous Hall response as the result of charge transfer driven
+interfacial ferromagnetism. These findings show that low dimensional spin-orbit
+entangled 3d-5d interfaces provide an avenue to uncover technologically
+relevant physical phenomena unattainable in bulk materials.",1609.01973v1
+2016-09-30,Nonlinear localized flatband modes with spin-orbit coupling,"We report the coexistence and properties of stable compact localized states
+(CLSs) and discrete solitons (DSs) for nonlinear spinor waves on a flatband
+network with spin-orbit coupling (SOC). The system can be implemented by means
+of a binary Bose-Einstein condensate loaded in the corresponding optical
+lattice. In the linear limit, the SOC opens a minigap between flat and
+dispersive bands in the system's bandgap structure, and preserves the existence
+of CLSs at the flatband frequency, simultaneously lowering their symmetry.
+Adding onsite cubic nonlinearity, the CLSs persist and remain available in an
+exact analytical form, with frequencies which are smoothly tuned into the
+minigap. Inside of the minigap, the CLS and DS families are stable in narrow
+areas adjacent to the FB. Deep inside the semi-infinite gap, both the CLSs and
+DSs are stable too.",1609.09640v1
+2017-02-08,"Quantum oscillation studies of topological semimetal candidate ZrGeM (M=S, Se, Te)","The WHM - type materials (W=Zr/Hf/La, H=Si/Ge/Sn/Sb, M=O/S/Se/Te) have been
+predicted to be a large pool of topological materials. These materials allow
+for fine tuning of spin-orbit coupling, lattice constant and structural
+dimensionality for various combinations of W, H and M elements, thus providing
+an excellent platform to study how these parameters' tuning affect topological
+semimetal state. In this work, we report the high field quantum oscillation
+studies on ZrGeM (M=S, Se, and Te). We have found the first experimental
+evidence for their theoretically-predicted topological semimetal states. From
+the angular dependence of quantum oscillation frequency, we have also studied
+the Fermi surface topologies of these materials. Moreover, we have compared
+Dirac electron behavior between the ZrGeM and ZrSiM systems, which reveals deep
+insights to the tuning of Dirac state by spin-orbit coupling and lattice
+constants in the WHM systems.",1702.02292v2
+2017-08-15,"Emergence of Topological Nodal Lines and Type II Weyl Nodes in Strong Spin--Orbit Coupling System InNbX2(X=S,Se)","Using first--principles density functional calculations, we systematically
+investigate electronic structures and topological properties of InNbX2 (X=S,
+Se). In the absence of spin--orbit coupling (SOC), both compounds show nodal
+lines protected by mirror symmetry. Including SOC, the Dirac rings in InNbS2
+split into two Weyl rings. This unique property is distinguished from other
+dicovered nodal line materials which normally requires the absence of SOC. On
+the other hand, SOC breaks the nodal lines in InNbSe2 and the compound becomes
+a type II Weyl semimetal with 12 Weyl points in the Brillouin Zone. Using a
+supercell slab calculation we study the dispersion of Fermi arcs surface states
+in InNbSe2, we also utilize a coherent potential approximation to probe their
+tolernace to the surface disorder effects. The quasi two--dimensionality and
+the absence of toxic elements makes these two compounds an ideal experimental
+platform for investigating novel properties of topological semimetals.",1708.04556v1
+2018-02-01,Retrieving the Size of Deep-subwavelength Objects via Tunable Optical Spin-Orbit Coupling,"We propose a scheme to retrieve the size parameters of a nano-particle on a
+glass substrate at a scale much smaller than the wavelength. This is achieved
+by illuminating the particle using two plane waves to create rich and
+non-trivial local polarization distributions, and observing the far-field
+scattering pattern into the substrate. A simple dipole model which exploits
+tunneling effect of evanescent field into regions beyond the critical angle, as
+well as directional scattering due to spin-orbit coupling is developed, to
+relate the particle's shape, size and position to the far-field scattering with
+remarkable sensitivity. Our method brings about a far-field super-resolution
+imaging scheme based on the interaction of vectorial light with nanoparticles.",1802.00268v1
+2018-02-26,Transport Properties of Near Surface InAs Two-dimensional Heterostructures,"Two-dimensional electron systems (2DESs) confined to the surface of
+narrowband semiconductors have attracted great interest since they can easily
+integrate with superconductivity (or ferromagnetism) enabling new possibilities
+in hybrid device architectures and study of exotic states in proximity of
+superconductors. In this work, we study indium arsenide heterostructures where
+combination of clean interface with superconductivity, high mobility and
+spin-orbit coupling can be achieved. The weak antilocalization measurements
+indicate presence of strong spin-orbit coupling at high densities. We study the
+magnetotransport as a function of top barrier and density and report clear
+observation of integer quantum Hall states. We report improved electron
+mobility reaching up to 44,000 cm$^{2}$/Vs in undoped heterstructures and well
+developed integer quantum Hall states starting as low as 2.5~T.",1802.09569v3
+2018-04-04,Magnetic properties of isolated Re ion and Re-Re complex in ZnO studied by GGA +U approach,"Magnetic properties of Re substituting for the divalent Zn ions and impurity
+pairs in wurtzite and zinc blende ZnO are analyzed by employing the Generalized
+Gradient Approximation with the +U corrections. The +U term applied to d(Zn),
+p(O), and d(Re) orbitals stabilizes spin polarization of Re. Re impurity
+introduces a defect level located in the band gap, and Re2+ generates the local
+spin 5/2 in both wurtzite and zinc blende structures. Magnetic coupling of
+Re-Re pairs as a function of distance between the defects, their relative
+orientation, and the charge state was calculated. All magnetic coupling between
+impurities is antiferromagnetic and due to an intermediate O atom via strong
+d(Re)-p(O) hybridization between Re and O states. The defect states and
+magnetic moments come from d(Re) with a contribution of p(O) orbitals of the O
+nearest neighbors of Re. The results show that the Re-doped wurtzite ZnO may be
+a new type of magneto-optical materials with a great promise.",1804.01332v1
+2018-04-16,Gauge-potential-induced rotation of spin-orbit-coupled Bose-Einstein condensates,"We demonstrate that a spin-orbit-coupled Bose-Einstein condensate can be
+effectively rotated by adding a real magnetic field to inputting gauge angular
+momentum, which is distinctly different from the traditional ways of rotation
+by stirring or Raman laser dressing to inputting canonical angular momentum.
+The gauge angular momentum is accompanied by the spontaneous generation of
+equal and opposite canonical angular momentum in the ground states, and it
+leads to the nucleation of quantized vortices. We explain this by indicating
+that the effective rotation with the vortex nucleation results from the
+effective magnetic flux induced by the gauge potential, which is essentially
+different from the previous scheme of creating vortices by synthetic magnetic
+fields. In the weakly interacting regime, symmetrically placed domains
+separated by vortex lines as well as half-integer giant vortices are
+discovered. With relatively strong interatomic interaction, we predict a
+structure of coaxially arranged annular vortex arrays, which is in stark
+contrast to the familiar Abrikosov vortex lattice. The developed way of
+rotation may be extended to a more general gauge system.",1804.05700v3
+2018-11-14,Majorana lattices from the quantized Hall limit of a proximitized spin-orbit coupled electron gas,"Motivated by recent experiments demonstrating intricate quantum Hall physics
+on the surface of elemental bismuth, we consider proximity coupling an $s$-wave
+superconductor to a two-dimensional electron gas with strong Rashba spin-orbit
+interactions in the presence of a strong perpendicular magnetic field. We focus
+on the high-field limit so that the superconductivity can be treated as a
+perturbation to the low-lying Landau levels. In the clean case, wherein the
+superconducting order parameter takes the form of an Abrikosov vortex lattice,
+we show that a lattice of hybridized Majorana modes emerges near the plateau
+transition of the lowest Landau level. However, unless
+magnetic-symmetry-violating perturbations are present, the system always has an
+even number of chiral Majorana edge modes and thus is strictly speaking Abelian
+in nature, in agreement with previous work on related setups. Interestingly,
+however, a weak topological superconducting phase can very naturally be
+stabilized near the plateau transition for the square vortex lattice. The
+relevance of our findings to potential near-term experiments on proximitized
+materials such as bismuth will be discussed.",1811.05990v1
+2020-07-01,Emulation of Astrocyte Induced Neural Phase Synchrony in Spin-Orbit Torque Oscillator Neurons,"Astrocytes play a central role in inducing concerted phase synchronized
+neural-wave patterns inside the brain. In this article, we demonstrate that
+injected radio-frequency signal in underlying heavy metal layer of spin-orbit
+torque oscillator neurons mimic the neuron phase synchronization effect
+realized by glial cells. Potential application of such phase coupling effects
+is illustrated in the context of a temporal ""binding problem"". We also present
+the design of a coupled neuron-synapse-astrocyte network enabled by compact
+neuromimetic devices by combining the concepts of local spike-timing dependent
+plasticity and astrocyte induced neural phase synchrony.",2007.00776v6
+2020-07-10,Exotic Vortex States with Discrete Rotational Symmetry in Atomic Fermi Gases with Spin-Orbital-Angular-Momentum Coupling,"We investigate the superfluidity of a two-component Fermi gas with
+spin-orbital-angular-momentum coupling (SOAMC). Due to the intricate interplay
+of SOAMC, two-photon detuning and atom-atom interaction, a family of vortex
+ground states emerge in a broad parameter regime of the phase diagram, in
+contrast to the usual case where an external rotation or magnetic field is
+generally required. More strikingly, an unprecedented vortex state, which
+breaks the continuous rotational symmetry to a discrete one spontaneously, is
+predicted to occur. The underlying physics are elucidated and verified by
+numerical simulations. The unique density distributions of the predicted vortex
+states enable a direct observation in experiment.",2007.05560v1
+2020-07-14,Non-linear transport without spin-orbit coupling or warping in two-dimensional Dirac semimetals,"It has recently been realized that the first-order moment of the Berry
+curvature, namely the Berry curvature dipole (BCD) can give rise to non-linear
+current in a wide variety of time-reversal invariant and non-centrosymmetric
+materials. While the BCD in two-dimensional Dirac systems is known to be finite
+only in the presence of either substantial spin-orbit coupling where low-energy
+Dirac quasiparticles form tilted cones or higher order warping of the Fermi
+surface, we argue that the low-energy Dirac quasiparticles arising from the
+merging of a pair of Dirac points without any tilt or warping of the Fermi
+surface can lead to a non-zero BCD. Remarkably, in such systems, the BCD is
+found to be independent of Dirac velocity as opposed to the Dirac dispersion
+with a tilt or warping effects. We further show that the proposed systems can
+naturally host helicity-dependent photocurrent due to their linear
+momentum-dependent Berry curvatures. Finally, we discuss an important byproduct
+of this work, i.e., nonlinear anomalous Nernst effect as a second-order thermal
+response.",2007.07274v2
+2013-08-09,Majorana Fermions on Zigzag Edge of Monolayer Transition Metal Dichalcogenides,"Majorana fermions, quantum particles with non-Abelian exchange statistics,
+are not only of fundamental importance, but also building blocks for
+fault-tolerant quantum computation. Although certain experimental breakthroughs
+for observing Majorana fermions have been made recently, their conclusive
+dection is still challenging due to the lack of proper material properties of
+the underlined experimental systems. Here we propose a new platform for
+Majorana fermions based on edge states of certain non-topological
+two-dimensional semiconductors with strong spin-orbit coupling, such as
+monolayer group-VI transition metal dichalcogenides (TMD). Using
+first-principles calculations and tight-binding modeling, we show that zigzag
+edges of monolayer TMD can host well isolated single edge band with strong
+spin-orbit coupling energy. Combining with proximity induced s-wave
+superconductivity and in-plane magnetic fields, the zigzag edge supports robust
+topological Majorana bound states at the edge ends, although the
+two-dimensional bulk itself is non-topological. Our findings points to a
+controllable and integrable platform for searching and manipulating Majorana
+fermions.",1308.2032v1
+2014-03-02,Shaping topological properties of the band structures in a shaken optical lattice,"To realize band structures with non-trivial topological properties in an
+optical lattice is an exciting topic in current studies on ultra cold atoms.
+Here we point out that this lofty goal can be achieved by using a simple scheme
+of shaking an optical lattice, which is directly applicable in current
+experiments. The photon-assistant band hybridization leads to the production of
+an effective spin-orbit coupling, in which the band index represents the
+pseudospin. When this spin-orbit coupling has finite strengths along multiple
+directions, non-trivial topological structures emerge in the Brillouin zone,
+such as topological defects with a winding number 1 or 2 in a shaken square
+lattice. The shaken lattice also allows one to study the transition between two
+band structures with distinct topological properties.",1403.0210v2
+2014-03-05,Superfluid Breakdown and Multiple Roton Gaps in Spin-Orbit Coupled Bose-Einstein Condensates on an Optical Lattice,"We investigate the superfluid phases of a Rashba spin-orbit coupled
+Bose-Einstein condensate residing on a two dimensional square optical lattice
+in the presence of an effective Zeeman field $\Omega$. At a critical value
+$\Omega=\Omega_c$, the single-particle spectrum $ E_k $ changes from having a
+set of four degenerate minima to a single minimum at $k=0$, corresponding to
+condensation at finite or zero momentum, respectively. We describe this quantum
+phase transition and the symmetry breaking of the condensate phases. We use the
+Bogoliubov theory to treat the superfluid phases and determine the phase
+diagram, the excitation spectrum and the sound velocity of the phonon
+excitations. A novel dynamically unstable superfluid regime occurring when
+$\Omega$ is close to $\Omega_c$ is analytically identified and the behavior of
+the condensate quantum depletion is discussed. Moreover, we show that there are
+two types of roton excitations occurring in the $\Omega<\Omega_c$ regime and
+obtain explicit values for the corresponding energy gaps.",1403.1267v2
+2014-03-18,Tunneling-assisted Spin-orbit Coupling in Bilayer Bose-Einstein Condensates,"Motivated by a goal of realizing spin-orbit coupling (SOC) beyond
+one-dimension (1D), we propose and analyze a method to generate an effective 2D
+SOC in bilayer BECs with laser-assisted inter-layer tunneling. We show that an
+interplay between the inter-layer tunneling, SOC and intra-layer atomic
+interaction can give rise to diverse ground state configurations. In
+particular, the system undergoes a transition to a new type of stripe phase
+which spontaneously breaks the time-reversal symmetry. Different from the
+ordinary Rashba-type SOC, a fractionalized skyrmion lattice emerges
+spontaneously in the bilayer system without external traps. Furthermore, we
+predict the occurrence of a tetracritical point in the phase diagram of the
+bilayer BECs, where four different phases merge together. The origin of the
+emerging different phases is elucidated.",1403.4338v2
+2016-11-23,"Electron interactions, spin-orbit coupling, intersite correlations in pyrochlore iridates","We perform combined density functional and dynamical mean-field calculations
+to study the pyrochlore iridates Lu$_2$Ir$_2$O$_7$, Y$_2$Ir$_2$O$_7$ and
+Eu$_2$Ir$_2$O$_7$. Both single-site and cluster dynamical mean-field
+calculations are performed and spin-orbit coupling is included. Paramagnetic
+metallic phases, antiferromagnetic metallic phases with tilted Weyl cones and
+antiferromagnetic insulating phases are found. The magnetic phases display
+all-in/all-out magnetic ordering, consistent with previous studies. Unusually
+for electronically three dimensional materials, the single-site dynamical
+mean-field approximation fails to reproduce qualitative material trends,
+predicting in particular that the paramagnetic phase properties of
+Y$_2$Ir$_2$O$_7$ and Eu$_2$Ir$_2$O$_7$ are almost identical, although in
+experiments the Y compound has a much higher resistance than the Eu compound.
+This qualitative failure is attributed to the importance of intersite magnetic
+correlations in the physics of these materials.",1611.07997v2
+2017-01-14,Multichannel Molecular State and Rectified Short-range Boundary Condition for Spin-orbit Coupled Ultracold Fermions Near p-wave Resonances,"We study the interplay of spin-orbit coupling (SOC) and strong p-wave
+interaction to the scattering property of spin-1/2 ultracold Fermi gases. Based
+on a two-channel square-well potential generating p-wave resonance, we show
+that the presence of an isotropic SOC, even for its length much longer than the
+potential range, can greatly modify the p-wave short-range boundary
+condition(BC). As a result, the conventional p-wave BC cannot predict the
+induced molecules near p-wave resonance, which can be fully destroyed to vanish
+due to strong interference between s- and p-wave channels. By analyzing the
+intrinsic reasons for the breakdown of conventional BC, we propose a new p-wave
+BC that can excellently reproduce the exact molecule solutions and also equally
+apply for a wide class of single-particle potentials besides SOC. This work
+reveals the significant effect of SOC to both the short- and long-range
+properties of fermions near p-wave resonance, paving the way for future
+exploring interesting few- and many-body physics in such system.",1701.03857v2
+2017-01-17,Disorder robustness and protection of Majorana bound states in ferromagnetic chains on conventional superconductors,"Majorana bound states (MBS) are well-established in the clean limit in chains
+of ferromagnetically aligned impurities deposited on conventional
+superconductors with finite spin-orbit coupling. Here we show that these MBS
+are very robust against disorder. By performing self-consistent calculations we
+find that the MBS are protected as long as the surrounding superconductor show
+no large signs of inhomogeneity. We find that longer chains offer more
+stability against disorder for the MBS, albeit the minigap decreases, as do
+increasing strengths of spin-orbit coupling and superconductivity.",1701.04670v2
+2018-05-10,Interplay of Floquet Lifshitz transitions and topological transitions in bilayer Dirac materials,"We show how transitions between different Lifshitz phases in bilayer Dirac
+materials with and without spin-orbit coupling can be studied by driving the
+system. The periodic driving is induced by a laser and the resultant phase
+diagram is studied in the high frequency limit using the Brillouin-Wigner
+perturbation approach to leading order. The examples of such materials include
+bilayer graphene and spin-orbit coupled materials such as bilayer silicene. The
+phase diagrams of the effective static models are analyzed to understand the
+interplay of topological phase transitions, with changes in the Chern number
+and topological Lifshitz transitions, with the ensuing changes in the Fermi
+surface. Both the topological transitions and the Lifshitz transitions are
+tuned by the amplitude of the drive.",1805.04125v1
+2011-11-08,Probing Majorana fermions in spin-orbit coupled atomic Fermi gases,"We examine theoretically the visualization of Majorana fermions in a
+two-dimensional trapped ultracold atomic Fermi gas with spin-orbit coupling. By
+increasing an external Zeeman field, the trapped gas transits from
+non-topological to topological superfluid, via a mixed phase in which both
+types of superfluids coexist. We show that the zero-energy Majorana fermion,
+supported by the topological superfluid and localized at the vortex core, is
+clearly visible through (i) the core density and (ii) the local density of
+states, which are readily measurable in experiment. We present a realistic
+estimate on experimental parameters for ultracold $^{40}$K atoms.",1111.1798v2
+2011-11-28,Noncollinear magnetism and spin-orbit coupling in 5d pyrochlore oxide Cd2Os2O7,"We investigated the electronic and magnetic properties of the pyrochlore
+oxide Cd$_2$Os$_2$O$_7$ using the density-functional theory plus on-site
+repulsion ($U$) method, and depict the ground-state phase diagram with respect
+to $U$. We conclude that the all-in/all-out non-collinear magnetic order is
+stable in a wide range of $U$. We also show that the easy-axis anisotropy
+arising from the spin-orbit (SO) coupling plays a significant role in
+stabilizing the all-in/all-out magnetic order. A \textit{pseudo gap} was
+observed near the transition between the antiferromagnetic metallic and
+insulating phases. Finally, we discuss possible origins of the peculiar
+low-temperature($T$) properties observed in experiments.",1111.6347v2
+2011-11-28,Topological invariants for spin-orbit coupled superconductor nanowires,"We show that a spin-orbit coupled semiconductor nanowire with Zeeman
+splitting and s-wave superconductivity is in symmetry class BDI (not D as is
+commonly thought) of the topological classification of band Hamiltonians. The
+class BDI allows for an integer Z topological invariant equal to the number of
+Majorana fermion (MF) modes at each end of the quantum wire protected by the
+chirality symmetry (reality of the Hamiltonian). Thus it is possible for this
+system (and all other d=1 models related to it by symmetry) to have an
+arbitrary integer number, not just 0 or 1 as is commonly assumed, of MFs
+localized at each end of the wire. The integer counting the number of MFs at
+each end reduces to 0 or 1, and the class BDI reduces to D, in the presence of
+terms in the Hamiltonian that break the chirality symmetry.",1111.6592v2
+2012-01-10,Topological Superconductivity and Majorana Fermions in Metallic Surface-States,"Heavy metals, such as Au, Ag, and Pb, often have sharp surface states that
+are split by strong Rashba spin-orbit coupling. The strong spin-orbit coupling
+and two-dimensional nature of these surface states make them ideal platforms
+for realizing topological superconductivity and Majorana fermions. In this
+paper, we further develop a proposal to realize Majorana fermions at the ends
+of quasi-one-dimensional metallic wires. We show how superconductivity can be
+induced on the metallic surface states by a combination of proximity effect,
+disorder, and interactions. Applying a magnetic field along the wire can drive
+the wire into a topologically non-trivial state with Majorana end-states.
+Unlike the case of a perpendicular field, where the chemical potential must be
+fined tuned near the Rashba-band crossing, the parallel field allows one to
+realize Majoranas for arbitrarily large chemical potential. We then show that,
+despite the presence of a large carrier density from the bulk metal, it is
+still possible to effectively control the chemical potential of the surface
+states by gating. The simplest version of our proposal, which involves only an
+Au(111) film deposited on a conventional superconductor, should be readily
+realizable.",1201.2176v1
+2012-04-29,Molecule and polaron in a highly polarized two-dimensional Fermi gas with spin-orbit coupling,"We show that spin-orbit coupling (SOC) gives rise to pairing instability in a
+highly polarized two-dimensional Fermi gas for arbitrary interaction strength.
+The pairing instability can lead to a Fulde-Ferrell-Larkin-Ovchinnikov-like
+molecular state, which undergoes a first-order transition into a pairing state
+with zero center-of-mass momentum as the parameters are tuned. These pairing
+states are metastable against a polaron state dressed by particle-hole
+fluctuations for small SOC. At large SOC, a polaron-molecule transition exists,
+which suggests a phase transition between the topological superfluid state and
+the normal state for a highly polarized Fermi gas in the thermodynamic limit.
+As polarization in a Fermi gas with SOC is induced by the effective Zeeman
+field, we also discuss the influences of the effective Zeeman field on the
+ground state of the system. Our findings may be tested directly in future
+experiments.",1204.6476v4
+2012-04-30,Striped states in weakly trapped ultracold Bose gases with Rashba spin-orbit coupling,"The striped state of ultracold bosons with Rashba spin-orbit coupling in a
+homogeneous infinite system has, as we show, a constant particle flow, which in
+a finite-size system would accumulate particles at the boundaries; it is thus
+not a physical steady state of the system. We propose, as a variational ansatz,
+a condensate wave function for a weakly trapped system which behaves similarly
+to the striped state near the center, but does not have particle flow at the
+boundaries. This state has a line of unquantized coreless vortices. We show, by
+minimizing the total energy, that our modified striped state has lower energy
+than the conventional striped state and it is thus a physically appropriate
+starting point to analyze striped states in finite systems.",1204.6534v3
+2013-09-03,The plasma oscillations in a two-dimensional electron-hole liquid under influence Rashba spin-orbit coupling,"The plasma oscillations of the two-dimensional electron-hole system in the
+presence of a Rashba spin-orbit coupling are studied. Only the intra-Landau
+level excitations are taken into account when the electrons and holes are
+situated on their lowest Landau levels, the filling factor $v^{2}$ being less
+than 1. The ground state of the two-dimensional electron-hole system is
+supposed to be the electron-hole liquid. The dispersion relations for the
+optical and acoustical plasmon modes were obtained. The acoustical plasmon
+branch has a linear dispersion law in the range of small wave vectors and
+monotonically increases with saturation at higher values of wave vectors. The
+optical plasmon branch has a quadratic dependence in the range of long
+wavelength and a monotonic increasing with saturation as in the case of
+acoustical branch.",1309.0716v1
+2013-09-11,Majorana bound states in two-channel time-reversal-symmetric nanowire systems,"We consider time-reversal-symmetric two-channel semiconducting quantum wires
+proximity coupled to an s-wave superconductor. We analyze the requirements for
+a nontrivial topological phase and find that necessary conditions are 1) the
+determinant of the pairing matrix in channel space must be negative, 2)
+inversion symmetry must be broken, and 3) the two channels must have different
+spin-orbit couplings. The first condition can be implemented in semiconducting
+nanowire systems where interactions suppress intra-channel pairing, while the
+inversion symmetry can be broken by tuning the chemical potentials of the
+channels. For the case of collinear spin-orbit directions, we find a general
+expression for the topological invariant by block diagonalization into two
+blocks with chiral symmetry only. By projection to the low-energy sector, we
+solve for the zero modes explicitly and study the details of the gap closing,
+which in the general case happens at finite momenta.",1309.2808v3
+2014-06-22,"Landau quantization, Rashba spin-orbit coupling and Zeeman splitting of two-dimensional heavy holes","The origin of the g-factor of the two-dimensional (2D) electrons and holes
+moving in the periodic crystal lattice potential with the perpendicular
+magnetic and electric fields is discussed. The Pauli equation describing the
+Landau quantization accompanied by the Rashba spin-orbit coupling (RSOC) and
+Zeeman splitting (ZS) for 2D heavy holes with nonparabolic dispersion law is
+solved exactly. The solutions have the form of the pairs of the Landau
+quantization levels due to the spinor-type wave functions. The energy levels
+depend on amplitudes of the magnetic and electric fields, on the g-factor
+{g-h}, and on the parameter of nonparabolicity C. The dependences of two energy
+levels in any pair on the Zeeman parameter {Z_h}={g_h}{m_h}/4{m_0}, where {m_h}
+is the hole effective mass, are nonmonotonous and without intersections. The
+smallest distance between them at C=0 takes place at the value {Z_h}=n/2, where
+n is the order of the chirality terms determined by the RSOC and is the same
+for any quantum number of the Landau quantization.",1406.5697v2
+2014-06-25,Magnetic structure of GdBiPt: A candidate antiferromagnetic topological insulator,"A topological insulator is a state of matter which does not break any
+symmetry and is characterized by topological invariants, the integer
+expectation values of non-local operators. Antiferromagnetism on the other hand
+is a broken symmetry state in which the translation symmetry is reduced and
+time reversal symmetry is broken. Can these two phenomena coexist in the same
+material? A proposal by Mong {\it et al.}\cite{Mong2010} asserts that the
+answer is yes. Moreover, it is theoretically possible that the onset of
+antiferromagnetism enables the non-trivial topology since it may create
+spin-orbit coupling effects which are absent in the non-magnetic phase. The
+current work examines a real system, half-Heusler GdBiPt, as a candidate for
+topological anti ferromagnetism. We find that the magnetic moments of the
+gadolinium atoms form ferromagnetic sheets which are stacked
+antiferromagnetically along the body diagonal. This magnetic structure may
+induce spin orbit coupling on band electrons as they hop perpendicular to the
+ferromagnetic sheets.",1406.6663v1
+2014-06-25,Tilting of the magnetic field in Majorana nanowires: critical angle and zero-energy differential conductance,"Semiconductor nanowires with strong spin-orbit coupling and proximity-induced
+s-wave superconductivity in an external magnetic field have been the most
+promising settings for approaches towards experimental evidence of topological
+Majorana zero-modes. We investigate the effect of tilting the magnetic field
+relative to the spin-orbit coupling direction in a simple continuum model and
+provide an analytical derivation of the critical angle, at which the
+topological states disappear. We also obtain the differential conductance
+characteristic of a junction with a normal wire for different tilting angles
+and propose the qualitative change of the dependence of the zero-energy
+differential conductance on the tunnel barrier strength at the critical angle
+as a new criterion for establishing the topological nature of the observed
+signal.",1406.6695v2
+2014-06-27,Equivalence of Rashba-Hubbard and Hubbard chains,"We review the fact that U(1) gauge symmetry enables the mapping of
+one-dimensional Hubbard chains with Rashba-type spin orbit coupling to
+renormalized Hubbard Hamiltonians. The existence of the mapping has important
+consequences for the interpretation of ARPES experiments on one-dimensional
+chains subject to Rashba spin orbit coupling and can be exploited to check for
+the applicability of the mapping. We show numerical applications of the mapping
+and consider the implications for bosonization as well as for the
+Heisenberg-limit of the Hubbard model. In addition we point out the
+consequences for various generalized Hubbard models.",1406.7293v2
+2015-12-13,Phase transitions and elementary excitations in spin-1 Bose gases with Raman-induced spin-orbit coupling,"We study the ground state phase diagram and the quantum phase transitions in
+spin-1 Bose gases with Raman induced spin-orbit coupling. In addition to the
+Bose-Einstein condensates with uniform density, three types of stripe
+condensation phases that simultaneously break the U(1) symmetry and the
+translation symmetry are identified. The transitions between these phases are
+investigated, and the occurrences of the various tricritical points are
+predicted. The excitation spectra in the plane-wave phase and the zero-momentum
+phase show rich roton-maxon structures, and their instabilities indicate the
+tendency to develop the crystalline order. We propose the atomic gas of
+$^{23}$Na could be a candidate for observing the stripe condensate with high
+contrast fringes.",1512.04091v2
+2015-12-23,Exotic superfluid of trapped Fermi gases with spin-orbit coupling in dimensional crossover,"We have studied the exotic superfluid phases of degenerated Fermi gases with
+spin-orbit coupling in a mixed dimensional system, where the motion of atoms
+are free in the x-direction and the tunneling between nearest tubes in the
+y-direction is permitted. Using the mean-field method, we obtain the phase
+diagrams of the system during the dimensional crossover between quasi one
+dimension to quasi two dimension. We find the existence of the topological
+state and Majorana edge mode in the weak tunneling case, and a rich phase
+diagram including two kinds of nodal superfluid phase and gapped superfluid
+phase in the opposite case. Our results show that topological pairing is
+favoured in quasi one dimension while nodal pairing state is favoured in quasi
+two dimension.",1512.07406v2
+2016-05-06,Optical-lattice-assisted magnetic phase transition in a spin-orbit-coupled Bose-Einstein condensate,"We investigate the effect of a periodic potential generated by a
+one-dimensional optical lattice on the magnetic properties of an $S=1/2$
+spin-orbit-coupled Bose gas. By increasing the lattice strength one can achieve
+a magnetic phase transition between a polarized and an unpolarized Bloch wave
+phase, characterized by a significant enhancement of the contrast of the
+density fringes. If the wave vector of the periodic potential is chosen close
+to the roton momentum, the transition could take place at very small lattice
+intensities, revealing the strong enhancement of the response of the system to
+a weak density perturbation. By solving the Gross-Pitaevskii equation in the
+presence of a three-dimensional trapping potential, we shed light on the
+possibility of observing the magnetic phase transition in currently available
+experimental conditions.",1605.02108v2
+2016-05-13,Two-Carrier Transport Induced Hall Anomaly and Large Tunable Magnetoresistance in Dirac Semimetal Cd3As2 Nanoplates,"Cd3As2 is a model material of Dirac semimetal with a linear dispersion
+relation along all three directions in the momentum space. The unique band
+structure of Cd3As2 makes it with both Dirac and topological properties. It can
+be driven into a Weyl semimetal by the symmetry breaking or a topological
+insulator by enhancing the spin-orbit coupling. Here we report the temperature
+and gate voltage dependent magnetotransport properties of Cd3As2 nanoplates
+with Fermi level near the Dirac point. The Hall anomaly demonstrates the
+two-carrier transport accompanied by a transition from n-type to p-type
+conduction with decreasing temperature. The carrier-type transition is
+explained by considering the temperature dependent spin-orbit coupling. The
+magnetoresistance exhibits a large non-saturating value up to 2000% at high
+temperatures, which is ascribed to the electron-hole compensation in the
+system. Our results are valuable for understanding the experimental
+observations related to the two-carrier transport in Dirac/Weyl semimetals,
+such as Na3Bi, ZrTe5, TaAs, NbAs, and HfTe5.",1605.04062v1
+2016-05-16,Topological edge states in single layers of honeycomb materials with strong spin-orbit coupling,"We study possible edge states in single layers of honeycomb materials such as
+$\alpha$-RuCl$_3$ and A$_2$IrO$_3$ (A=Li, Na) with strong spin-orbit coupling
+(SOC). These two dimensional systems exhibit linearly dispersing
+one-dimensional (1D) edge states when their 1D boundary forms a zig-zag shape.
+Using an effective tight-binding model based on first principles band structure
+calculations including Hubbard U and SOC, we find degenerate edge states at the
+zone center and zone boundary. The roles of chiral symmetry and time-reversal
+symmetry are presented. The implications to experimental signatures and the
+effects of disorder are also discussed.",1605.04916v1
+2016-05-26,Fermionic boundary modes in two-dimensional noncentrosymmetric superconductors,"We calculate the spectrum of the Andreev boundary modes in a two-dimensional
+superconductor formed at an interface between two different non-superconducting
+materials, e.g. insulating oxides. Inversion symmetry is absent in this system,
+and both the electron band structure and the superconducting pairing are
+strongly affected by the spin-orbit coupling of the Rashba type. We consider
+isotropic s-wave pairing states, both with and without time-reversal symmetry
+breaking, as well as various d-wave states. In all cases, there exist subgap
+Andreev boundary states, whose properties, in particular, the number and
+location of the zero-energy modes, qualitatively depend on the gap symmetry and
+the spin-orbit coupling strength.",1605.08394v4
+2016-08-01,Growth and engineering of perovskite SrIrO3 thin films,"5d transition-metal-based oxides display emergent phenomena due to the
+competition between the relevant energy scales of the correlation, bandwidth,
+and most importantly, the strong spin-orbit coupling (SOC). Starting from the
+prediction of novel oxide topological insulators in bilayer ABO3 (B = 5d
+elements) thin-film grown along the (111) direction, 5d-based perovskites (Pv)
+form a new paradigm in the thin-film community. Here, we reviewed the
+scientific accomplishments in Pv-SrIrO3 thin films, a popular candidate for
+observing non-trivial topological phenomena. Although the predicted topological
+phenomena are unknown, the Pv-SrIrO3 thin film shows many emergent properties
+due to the delicate interplay between its various degrees of freedom. These
+observations provide new physical insight and encourage further research on the
+design of new 5d-based heterostructures or superlattices for the observation of
+the hidden topological quantum phenomena in strong spin-orbit coupled oxides.",1608.00482v2
+2016-08-12,Dynamic response functions and helical gaps in interacting Rashba nanowires with and without magnetic fields,"A partially gapped spectrum due to the application of a magnetic field is one
+of the main probes of Rashba spin-orbit coupling in nanowires. Such a ""helical
+gap"" manifests itself in the linear conductance, as well as in dynamic response
+functions such as the spectral function, the structure factor, or the
+tunnelling density of states. In this paper, we investigate theoretically the
+signature of the helical gap in these observables with a particular focus on
+the interplay between Rashba spin-orbit coupling and electron-electron
+interactions. We show that in a quasi-one-dimensional wire, interactions can
+open a helical gap even without magnetic field. We calculate the dynamic
+response functions using bosonization, a renormalization group analysis, and
+the exact form factors of the emerging sine-Gordon model. For special
+interaction strengths, we verify our results by refermionization. We show how
+the two types of helical gaps, caused by magnetic fields or interactions, can
+be distinguished in experiments.",1608.03756v3
+2017-06-01,Spin-orbit coupling and transport of strongly correlated two-dimensional systems,"Measuring the magnetoresistance (MR) of ultraclean {\it GaAs} two-dimensional
+holes in a large $r_s$ range of 20-50, two striking behaviors in relation to
+the spin-orbit coupling (SOC) emerge in response to strong electron-electron
+interaction. First, in exact correspondence to the zero-field
+metal-to-insulator transition (MIT), the sign of the MR switches from being
+positive in the metallic regime to being negative in the insulating regime when
+the carrier density crosses the critical density $p_c$ of MIT ($r_s\sim 39$).
+Second, as the SOC-driven correction $\Delta\rho$ to the MR decreases with
+reducing carrier density (or the in-plane wave vector), it exhibits an upturn
+in the close proximity just above $p_c$ where $r_s$ is beyond 30, indicating a
+substantially enhanced SOC effect. This peculiar behavior echoes with a trend
+of delocalization long suspected for the SOC-interaction interplay. Meanwhile,
+for $p<p_c$ or $r_s>40$, in contrast to the common belief that a magnet field
+enhances Wigner crystallization, the negative MR is likely linked to enhanced
+interaction.",1706.00297v1
+2017-06-29,Dimensionality-driven metal-insulator-transition in spin-orbit coupled SrIrO$_3$,"Upon reduction of the film thickness we observe a metal-insulator transition
+in epitaxially stabilized, spin-orbit coupled SrIrO$_3$ ultrathin films. By
+comparison of the experimental electronic dispersions with density functional
+theory at various levels of complexity we identify the leading microscopic
+mechanisms, i.e., a dimensionality-induced re-adjustment of octahedral
+rotations, magnetism, and electronic correlations. The astonishing resemblance
+of the band structure in the two-dimensional limit to that of bulk
+Sr$_2$IrO$_4$ opens new avenues to unconventional superconductivity by ""clean""
+electron doping through electric field gating.",1706.09694v1
+2017-10-10,One dimensional phase transition problem modelling striped spin orbit coupled Bose-Einstein condensates,"We study the behaviour of a Modica-Mortola phase transition type problem with
+a non-homogeneous Neumann boundary condition. According to the parameters of
+the problem, this leads to the existence of either one component occupying most
+of the condensate with an outer boundary layer containing the other component,
+or to many interfaces, on a periodic pattern. This is related to the striped
+behaviour of a two component Bose-Einstein condensate with spin orbit coupling
+in one dimension. We prove that minimizers of the full Gross-Pitaevskii energy
+in 1D converge, in the Thomas-Fermi limit of strong intra-component
+interaction, to those of the simplified Modica-Mortola problem we have studied
+in the first part.",1710.03644v1
+2017-10-24,Truncated unity functional renormalization group for multiband systems with spin-orbit coupling,"Although the functional renormalization group (fRG) is by now a
+well-established method for investigating correlated electron systems, it is
+still undergoing significant technical and conceptual improvements. In
+particular, the motivation to optimally exploit the parallelism of modern
+computing platforms has recently led to the development of the
+""truncated-unity"" functional renormalization group (TU-fRG). Here, we review
+this fRG variant, and we provide its extension to multiband systems with
+spin-orbit coupling. Furthermore, we discuss some aspects of the implementation
+and outline opportunities and challenges ahead for predicting the ground-state
+ordering and emergent energy scales for a wide class of quantum materials.",1710.08830v2
+2017-10-27,Topological superconductivity in the extended Kitaev-Heisenberg model,"We study superconducting pairing in the doped Kitaev-Heisenberg model by
+taking into account the recently proposed symmetric off-diagonal exchange
+$\Gamma$. By performing a mean-field analysis, we classify all possible
+superconducting phases in terms of symmetry, explicitly taking into account
+effects of spin-orbit coupling. Solving the resulting gap equations
+self-consistently, we map out a phase diagram that involves several
+topologically nontrivial states. For $\Gamma<0$, we find a competition between
+a time-reversal symmetry breaking chiral phase with Chern number $\pm1$ and a
+time-reversal symmetric nematic phase that breaks the rotational symmetry of
+the lattice. On the other hand, for $\Gamma \geq 0$ we find a time-reversal
+symmetric phase that preserves all the lattice symmetries, thus yielding
+clearly distinguishable experimental signatures for all superconducting phases.
+Both of the time-reversal symmetric phases display a transition to a
+$\mathbb{Z}_2$ non-trivial phase at high doping levels. Finally, we also
+include a symmetry-allowed spin-orbit coupling kinetic energy and show that it
+destroys a tentative symmetry protected topological order at lower doping
+levels. However, it can be used to tune the time-reversal symmetric phases into
+a $\mathbb{Z}_2$ non-trivial phase even at lower doping.",1710.10014v1
+2017-12-05,"Competition between spin-orbit coupling, magnetism, and dimerization in the honeycomb iridates: $α$-Li$_{2}$IrO$_{3}$ under pressure","Single-crystal x-ray diffraction studies with synchrotron radiation on the
+honeycomb iridate $\alpha$-Li$_{2}$IrO$_{3}$ reveal a pressure-induced
+structural phase transition with symmetry lowering from monoclinic to triclinic
+at a critical pressure of $P_{c}$ = 3.8 GPa. According to the evolution of the
+lattice parameters with pressure, the transition mainly affects the $ab$ plane
+and thereby the Ir hexagon network, leading to the formation of Ir--Ir dimers.
+These observations are independently predicted and corroborated by our
+\textit{ab initio} density functional theory calculations where we find that
+the appearance of Ir--Ir dimers at finite pressure is a consequence of a subtle
+interplay between magnetism, correlation, spin-orbit coupling, and covalent
+bonding. Our results further suggest that at $P_{c}$ the system undergoes a
+magnetic collapse. Finally we provide a general picture of competing
+interactions for the honeycomb lattices $A_{2}$$M$O$_{3}$ with $A$= Li, Na and
+$M$ = Ir, Ru.",1712.01669v1
+2017-12-08,Odd-frequency pairing and Kerr effect in the heavy-fermion superconductor UPt$_3$,"We study the emergence of odd-frequency superconducting pairing in UPt$_3$.
+Starting from a tight-binding model accounting for the nonsymmorphic crystal
+symmetry of UPt$_3$ and assuming an order parameter in the $E_{2u}$
+representation, we demonstrate that odd-frequency pairing arises very
+generally, as soon as inter-sublattice hopping or spin-orbit coupling is
+present. We also show that in the low temperature superconducting $B$ phase,
+the presence of a chiral order parameter together with spin-orbit coupling,
+leads to additional odd-frequency pair amplitudes not present in the $A$ or $C$
+phases. Furthermore, we show that a finite Kerr rotation in the $B$ phase is
+only present if odd-$\omega$ pairing also exists.",1712.03021v2
+2017-12-19,Emergent magnetic degeneracy in iron pnictides due to the interplay between spin-orbit coupling and quantum fluctuations,"Recent experiments in iron pnictide superconductors reveal that, as the
+putative magnetic quantum critical point is approached, different types of
+magnetic order coexist over a narrow region of the phase diagram. Although
+these magnetic configurations share the same wave-vectors, they break distinct
+symmetries of the lattice. Importantly, the highest superconducting transition
+temperature takes place close to this proliferation of near-degenerate magnetic
+states. In this paper, we employ a renormalization group calculation to show
+that such a behavior naturally arises due to the effects of spin-orbit coupling
+on the quantum magnetic fluctuations. Formally, the enhanced magnetic
+degeneracy near the quantum critical point is manifested as a stable Gaussian
+fixed point with a large basin of attraction. Implications of our findings to
+the superconductivity of the iron pnictides are also discussed.",1712.07188v4
+2017-12-23,Interfacial exchange coupling induced chiral symmetry-breaking of Spin-Orbit effects,"We demonstrate that the interfacial exchange coupling in
+ferromagnetic/antiferromagnetic (FM/AFM) systems induces symmetry-breaking of
+the Spin-Orbit (SO) effects. This has been done by studying the field and angle
+dependencies of anisotropic magnetoresistance and vectorialresolved
+magnetization hysteresis loops, measured simultaneously and reproduced with
+numerical simulations. We show how the induced unidirectional magnetic
+anisotropy at the FM/AFM interface results in strong asymmetric transport
+behaviors, which are chiral around the magnetization hard-axis direction.
+Similar asymmetric features are anticipated in other SO-driven phenomena.",1712.08766v1
+2018-01-30,Tuning Rashba spin-orbit coupling in homogeneous semiconductor nanowires,"We use $\vec{k}\cdot\vec{p}$ theory to estimate the Rashba spin-orbit
+coupling (SOC) in large semiconductor nanowires. We specifically investigate
+GaAs- and InSb-based devices with different gate configurations to control
+symmetry and localization of the electron charge density. We explore
+gate-controlled SOC for wires of different size and doping, and we show that in
+high carrier density SOC has a non-linear electric field susceptibility, due to
+large reshaping of the quantum states. We analyze recent experiments with InSb
+nanowires in light of our calculations. Good agreement is found with SOC
+coefficients reported in Phys. Rev.B 91, 201413(R) (2015), but not with the
+much larger values reported in Nat Commun., 8, 478 (2017). We discuss possible
+origins of this discrepancy.",1801.09905v1
+2018-09-24,Crystalline topological Dirac semimetal phase in rutile structure $β'$-PtO$_2$,"Based on first-principles calculations and symmetry analysis, we propose that
+a transition metal rutile oxide, in particular $\beta'$-PtO$_2$, can host a
+three-dimensional topological Dirac semimetal phase. We find that
+$\beta'$-PtO$_2$ possesses a linked nodal rings structure when spin-orbit
+coupling is neglected. Incorporating spin-orbit coupling gaps the nodal rings,
+while preserving a single pair of three-dimensional Dirac points protected by a
+screw rotation symmetry. This Dirac point is created by a band inversion of two
+$d$ bands, which is a realization of a DSM phase in correlated electron
+systems. Moreover, a mirror plane in the momentum space carries a nontrivial
+mirror Chern number $n_M = -2$, which distinguishes $\beta'$-PtO$_2$ from the
+Dirac semimetals known so far, such as Na$_3$Bi and Cd$_3$As$_2$. If we apply a
+perturbation that breaks the rotation symmetry and preserves the mirror
+symmetry, the Dirac points are gapped and the system becomes a topological
+crystalline insulator.",1809.08963v2
+2018-09-25,Band structure and carrier effective masses of boron arsenide: effects of quasiparticle and spin-orbit coupling corrections,"We determine the fundamental electronic and optical properties of the
+high-thermal-conductivity III-V semiconductor boron arsenide (BAs) using
+density functional and many body perturbation theory including quasiparticle
+and spin-orbit coupling corrections. We find that the fundamental band gap is
+indirect with a value of 2.049 eV, while the minimum direct gap has a value of
+4.135 eV. We calculate the carrier effective masses and report smaller values
+for the holes than the electrons, indicating higher hole mobility and easier
+p-type doping. The small difference between the static and high frequency
+dielectric constants indicates that BAs is only weakly ionic. We also observe
+that the imaginary part of the dielectric function exhibits a strong absorption
+peak, which corresponds to parallel bands in the band structure. Our estimated
+exciton binding energy of 43 meV indicates that excitons are relatively stable
+against thermal dissociation at room temperature. Our work provides theoretical
+insights on the fundamental electronic properties of BAs to guide experimental
+characterization and device applications.",1809.09549v2
+2019-07-17,Generating superconducting vortices via spin-orbit coupling,"Spin-orbit coupling (SOC) is known to play an important role in
+superconductor/ferromagnet heterostructures. Here we demonstrate that SOC
+results in the spontaneous generation of vortices in an \textit{s}-wave
+superconductor placed below a ferromagnetic metal with intrinsic or interfacial
+SOC. By using the generalized London and Ginzburg-Landau theories, we calculate
+the supercurrent amplitude in various types of S/F heterostructures at and
+below the superconducting critical temperature. In particular, we show that
+even in the limit of weak SOC, vortex-antivortex pairs are stabilized and that
+an attractive interaction between vortices and SOC act to pin vortices along
+the S/F interface. We discuss key experiments to investigate these phenomena,
+which would provide a platform to the creation of Abrikosov vortex memory.",1907.07510v1
+2019-07-19,Unconventional topology with a Rashba spin-orbit coupled quantum gas,"Topological order can be found in a wide range of physical systems, from
+crystalline solids, photonic meta-materials and even atmospheric waves to
+optomechanic, acoustic and atomic systems. Topological systems are a robust
+foundation for creating quantized channels for transporting electrical current,
+light, and atmospheric disturbances. These topological effects are quantified
+in terms of integer-valued invariants, such as the Chern number, applicable to
+the quantum Hall effect, or the $\mathbb{Z}_2$ invariant suitable for
+topological insulators. Here we engineered Rashba spin-orbit coupling for a
+cold atomic gas giving non-trivial topology, without the underlying crystalline
+structure that conventionally yields integer Chern numbers. We validated our
+procedure by spectroscopically measuring the full dispersion relation, that
+contained only a single Dirac point. We measured the quantum geometry
+underlying the dispersion relation and obtained the topological index using
+matter-wave interferometry. In contrast to crystalline materials, where
+topological indices take on integer values, our continuum system reveals an
+unconventional half-integer Chern number, potentially implying new forms of
+topological transport.",1907.08637v1
+2019-09-05,Imaginary-time matrix product state impurity solver in a real material calculation: Spin-orbit coupling in Sr$_2$RuO$_4$,"Using an imaginary-time matrix-product state (MPS) based quantum impurity
+solver we perform a realistic dynamical mean-field theory (DMFT) calculation
+combined with density functional theory (DFT) for Sr$_2$RuO$_4$. We take the
+full Hubbard-Kanamori interactions and spin-orbit coupling (SOC) into account.
+The MPS impurity solver works at essentially zero temperature in the presence
+of SOC, a regime of parameters currently inaccessible to continuous-time
+quantum Monte Carlo (CTQMC) methods, due to a severe sign problem. We show that
+earlier results obtained at high temperature, namely that the diagonal
+self-energies are nearly unaffected by SOC and that interactions lead to an
+effective enhancement of the SOC, hold even at low temperature. We observe that
+realism makes the numerical solution of the impurity model with MPS much more
+demanding in comparison to earlier works on Bethe lattice models, requiring
+several algorithmic improvements.",1909.02503v2
+2019-09-09,Weak anti-localization in spin-orbit coupled lattice systems,"The quantum correction to electrical conductivity is studied on the basis of
+two-dimensional Wolff Hamiltonian, which is an effective model for a spin-orbit
+coupled (SOC) lattice system. It is shown that weak anti-localization (WAL)
+arises in SOC lattices, although its mechanism and properties are different
+from the conventional WAL in normal metals with SOC impurities. The interband
+SOC effect induces the contribution from the interband singlet Cooperon, which
+plays a crucial role for WAL in the SOC lattice. It is also shown that there is
+a crossover from WAL to weak localization in SOC lattices when the Fermi energy
+or band gap changes. The implications of the present results to Bi-Sb alloys
+and PbTe under pressure are discussed.",1909.03757v1
+2019-10-17,Piezoelectricity and Topological Quantum Phase Transitions in Two-Dimensional Spin-Orbit Coupled Crystals with Time-Reversal Symmetry,"Finding new physical responses that signal topological quantum phase
+transitions is of both theoretical and experimental importance. Here, we
+demonstrate that the piezoelectric response can change discontinuously across a
+topological quantum phase transition in two-dimensional time-reversal invariant
+systems with spin-orbit coupling, thus serving as a direct probe of the
+transition. We study all gap closing cases for all 7 plane groups that allow
+non-vanishing piezoelectricity and find that any gap closing with 1 fine-tuning
+parameter between two gapped states changes either the $Z_2$ invariant or the
+locally stable valley Chern number. The jump of the piezoelectric response is
+found to exist for all these transitions, and we propose the HgTe/CdTe quantum
+well and BaMnSb$_2$ as two potential experimental platforms. Our work provides
+a general theoretical framework to classify topological quantum phase
+transitions and reveals their ubiquitous relation to the piezoelectric
+response.",1910.08050v3
+2019-10-22,Berry Curvature Dipole in Strained Graphene: a Fermi Surface Warping Effect,"It has been recently established that optoelectronic and non-linear transport
+experiments can give direct access to the dipole moment of the Berry curvature
+in non-magnetic and non-centrosymmetric materials. Thus far, non-vanishing
+Berry curvature dipoles have been shown to exist in materials with substantial
+spin-orbit coupling where low-energy Dirac quasiparticles form tilted cones.
+Here, we prove that this topological effect does emerge in two-dimensional
+Dirac materials even in the complete absence of spin-orbit coupling. In these
+systems, it is the warping of the Fermi surface that triggers sizeable Berry
+dipoles. We show indeed that uniaxially strained monolayer and bilayer
+graphene, with substrate-induced and gate-induced band gaps respectively, are
+characterized by Berry curvature dipoles comparable in strength to those
+observed in monolayer and bilayer transition metal dichalcogenides.",1910.09872v1
+2019-10-30,Phononic Helical Nodal Lines with $\mathcal{PT}$ Protection in MoB$_{2}$,"While condensed matter systems host both Fermionic and Bosonic
+quasi-particles, reliably predicting and empirically verifying topological
+states is only mature for Fermionic electronic structures, leaving topological
+Bosonic excitations sporadically explored. This is unfortunate, as Bosonic
+systems such a phonons offer the opportunity to assess spinless band structures
+where nodal lines can be realized without invoking special additional symetries
+to protect against spin-orbit coupling. Here we combine first-principles
+calculations and meV-resolution inelastic x-ray scattering to demonstrate the
+first realization of parity-time reversal ($\mathcal{PT}$) symmetry protected
+helical nodal lines in the phonon spectrum of MoB$_{2}$. This structure is
+unique to phononic systems as the spin-orbit coupling present in electronic
+systems tends to lift the degeneracy away from high-symmetry locations. Our
+study establishes a protocol to accurately identify topological Bosonic
+excitations, opening a new route to explore exotic topological states in
+crystalline materials.",1910.13637v1
+2020-01-08,Bardeen-Cooper-Schrieffer--type pairing in a spin-$\frac{1}{2}$ Bose gas with spin-orbit coupling,"We apply the functional path-integral approach to analyze how the presence of
+a spin-orbit coupling (SOC) affects the basic properties of a BCS-type paired
+state in a two-component Bose gas. In addition to a mean-field theory that is
+based on the saddle-point approximation for the inter-component pairing, we
+derive a Ginzburg-Landau theory by including the Gaussian fluctuations on top,
+and use them to reveal the crucial roles played by the momentum-space structure
+of an arbitrary SOC field in the stability of the paired state at finite
+temperatures. For this purpose, we calculate the critical transition
+temperature for the formation of paired bosons, and that of the gapless
+quasiparticle excitations for a broad range of interaction and SOC strengths.
+In support of our results for the many-body problem, we also benchmark our
+numerical calculations against the analytically-tractable limits, and provide a
+full account of the two-body limit including its non-vanishing binding energy
+for arbitrarily weak interactions and the anisotropic effective mass tensor.",2001.02584v1
+2020-01-28,"Realization of a density-dependent Peierls phase in a synthetic, spin-orbit coupled Rydberg system","We experimentally realize a Peierls phase in the hopping amplitude of
+excitations carried by Rydberg atoms, and observe the resulting characteristic
+chiral motion in a minimal setup of three sites. Our demonstration relies on
+the intrinsic spin-orbit coupling of the dipolar exchange interaction combined
+with time-reversal symmetry breaking by a homogeneous external magnetic field.
+Remarkably, the phase of the hopping amplitude between two sites strongly
+depends on the occupancy of the third site, thus leading to a correlated
+hopping associated to a density-dependent Peierls phase. We experimentally
+observe this density-dependent hopping and show that the excitations behave as
+anyonic particles with a non-trivial phase under exchange. Finally, we confirm
+the dependence of the Peierls phase on the geometrical arrangement of the
+Rydberg atoms.",2001.10357v1
+2020-02-04,Signatures of bosonic excitations in high-harmonic spectra of Mott insulators,"The high harmonic spectrum of the Mott insulating Hubbard model has recently
+been shown to exhibit plateau structures with cutoff energies determined by
+$n$th nearest neighbor doublon-holon recombination processes. The spectrum thus
+allows to extract the on-site repulsion $U$. Here, we consider generalizations
+of the single-band Hubbard model and discuss the signatures of bosonic
+excitations in high harmonic spectra. Specifically, we study an
+electron-plasmon model which captures the essential aspects of the dynamically
+screened Coulomb interaction in solids and a multi-orbital Hubbard model with
+Hund coupling which allows to analyze the effect of local spin excitations. For
+the electron-plasmon model, we show that the high harmonic spectrum can reveal
+information about the screened and bare onsite interaction, the boson
+frequency, as well as the relation between boson coupling strength and boson
+frequency. In the multi-orbital case, string states formed by local spin
+excitations result in an increase of the radiation intensity and cutoff energy
+associated with higher order recombination processes.",2002.01327v1
+2020-12-29,Topological turbulence in spin-orbit-coupled driven-dissipative quantum fluids of light generates high angular momentum states,"We demonstrate the formation of a high angular momentum turbulent state in an
+exciton-polariton quantum fluid with TE-TM Spin-Orbit Coupling (SOC). The
+transfer of particles from quasi-resonantly cw pumped \spl component to \sm
+component is accompanied with the generation of a turbulent gas of quantum
+vortices by inhomogeneities. We show that this system is unstable with respect
+to the formation of bogolons at a finite wave vector, controlled by the laser
+detuning. In a finite-size cavity, the domains with this wave vector form a
+ring-like structure along the border of a cavity, with a gas of mostly
+same-sign vortices in the center. The total angular momentum is imposed by the
+sign of TE-TM SOC, the wave vector of instability, and the cavity size. This
+effect can be detected experimentally via local dispersion measurements or by
+interference. The proposed configuration thus allows simultaneous experimental
+studies of quantum turbulence and high-angular momentum states in
+continuously-pumped exciton-polariton condensates.",2012.14814v1
+2012-05-03,Electronic structure and magnetic properties of NaOsO$_{3}$,"A comprehensive investigation of the electronic and magnetic properties of
+NaOsO3 has been made using the first principle calculations, in order to
+understand the importance of Coulomb interaction, spin-orbit coupling and
+magnetic order in its temperature-induced and magnetic-related metal-insulator
+transition. It is found that its electronic structure near the Fermi energy is
+dominated by strongly hybridized Os 5d and O 2p states. Despite of the large
+strength of spin-orbit coupling, it has only small effect on the electronic and
+magnetic properties of NaOsO3. On the other hand, the on-site Coulomb repulsion
+affects the band structure significantly, but, a reasonable U alone cannot open
+a band gap. Its magnetism is itinerant, and the magnetic configuration plays an
+important role in determining the electronic structure. Its ground state is of
+a G-type antiferromagnet, and it is the combined effect of U and magnetic
+configuration that results in the insulating behavior of NaOsO3.",1205.0740v1
+2017-05-03,Theory of Ultra Low Tc Superconductivity in Bismuth: Tip of an Iceberg ?,"Superconductivity with an ultra low Tc $\sim$ 0.5 mK was discovered recently
+in bismuth, a semimetal. To develop a model and scenario for Bi we begin with a
+cubic reference lattice, close to A7 (dimerized cubic) structure of Bi. Three
+valence electrons hop among 6p$_x$, 6p$_y$ and 6p$_z$ orbitals and form
+\textit{quasi one dimensional chains at half filling}. An interesting interplay
+follows: i) Mott localization tendency in the chains, ii) metallization by
+interchain hopping and iii) lattice dimerization by electron-phonon coupling.
+In our proposal, a potential high Tc superconductivity from RVB mechanism is
+lost in the game. However some superconducting fluctuations survive. Tiny fermi
+pockets seen in Bi are viewed as remnant \textit{evanescent Bogoliubov quasi
+particles} in an anomalous normal state. Multi band character admits
+possibility of PT violating \textit{chiral singlet superconductivity}. Bi has a
+strong spin orbit coupling; Kramers theorem protects our proposal for the bulk
+by replacing real spin by Kramer pair. Control of chain dimerization might
+resurrect high Tc superconductivity in Bi, Sb and As.",1705.01506v1
+2017-05-24,Evolution of Band Topology by Competing Band Overlap and Spin-Orbit Coupling: Twin Dirac Cones in Ba$_3$SnO as a Prototype,"We theoretically demonstrate how competition between band inversion and
+spin-orbit coupling (SOC) results in nontrivial evolution of band topology,
+taking antiperovskite Ba$_3$SnO as a prototype material. A key observation is
+that when the band inversion dominates over SOC, there appear ""twin"" Dirac
+cones in the band structure. Due to the twin Dirac cones, the band shows highly
+peculiar structure in which the upper cone of one of the twin continuously
+transforms to the lower cone of the other. Interestingly, the relative size of
+the band inversion and SOC is controlled in this series of antiperovskite
+A$_3$EO by substitution of A (Ca, Sr, Ba) and/or E (Sn, Pb) atoms. Analysis of
+an effective model shows that the emergence of twin Dirac cones is general,
+which makes our argument a promising starting point for finding a singular band
+structure induced by the competing band inversion and SOC.",1705.08934v1
+2018-03-12,Rashba induced Kondo screening of a magnetic impurity in two-dimensional superconductor,"We study the Kondo screening of a magnetic impurity in a two-dimensional
+superconductor with Rashba spin-orbit coupling (SOC). It is found that the
+Rashba interaction generates a novel Kondo screening channel, in which the
+local moment is screened by the exchange coupling with conduction electrons in
+different spin and orbital states. The Kondo temperature associated with this
+process is determined by the interplay between the Rashba SOC and
+superconducting energy gap. As a result, the quantum phase transition between
+the magnetic doublet and Kondo singlet ground states is significantly affected
+by increasing Rashba SOC in such a system. This result uncovers that the Rashba
+SOC plays an instructive role and provides a novel screening channel for the
+Kondo effect, which is expected to be observed in future experiments.",1803.04080v1
+2018-03-12,Type-I and type-II Nodal Lines Coexistence in the Antiferromagnetic monolayer CrAs$_{2}$,"Topological nodal line semimetals, hosting one-dimensional Fermi lines with
+symmetry protection, has become a hot topic in topological quantum matter. Due
+to the breaking of time reversal symmetry in magnetic system, nodal lines
+require protection by additional symmetries. Here, we report the discovery of
+antiferromagnetic type-I and type-II nodal lines coexist in the monolayer
+CrAs$_{2}$ based on a systematic first-principles calculation. Remarkably, the
+type-I nodal line in CrAs$_{2}$ form a concentric loop centered around the
+$\Gamma$ point is filling-enforced by nonsymmorphic analogue symmetry and
+robust against spin-orbital coupling. The type-II nodal lines, a kind of open
+nodal lines appear around the Fermi level, are protected by the mirror symmetry
+in the absence of spin-orbital coupling. The antiferromagnetic monolayer
+CrAs$_{2}$ proposed here may provide a platform for the correlation between
+magnetism and exotic topological phases.",1803.04133v2
+2018-03-12,Universal dynamics of zero-momentum to plane-wave transition in spin-orbit coupled Bose-Einstein condensates,"We investigate the universal spatiotemporal dynamics in spin-orbit coupled
+Bose-Einstein condensates which are driven from the zero-momentum phase to the
+plane-wave phase. The excitation spectrum reveals that, at the critical point,
+the Landau critical velocity vanishes and the correlation length diverges.
+Therefore, according to the Kibble-Zurek mechanism, spatial domains will
+spontaneously appear in such a quench through the critical point. By simulating
+the real-time dynamics, we numerically extract the static correlation length
+critical exponent v and the dynamic critical exponent z from the scalings of
+the temporal bifurcation delay and the spatial domain number. The numerical
+scalings consist well with the analytical ones obtained by analyzing the
+excitation spectrum.",1803.04768v1
+2018-03-20,Spin-orbit-coupled ferroelectric superconductivity,"Motivated by recent studies on ferroelectric-like order coexisting with
+metallicity, we investigate ferroelectric (FE) superconductivity in which a
+FE-like structural phase transition occurs in the superconducting state. We
+consider a two-dimensional s-wave superconductor with Rashba-type antisymmetric
+spin-orbit coupling (ASOC). Assuming linear relationship between polar lattice
+displacement and strength of the ASOC, we treat the Rashba-type ASOC as a
+molecular field of FE-like order. It is shown that the FE-like order is induced
+by the magnetic field when the system is superconducting. Furthermore, we
+clarify the FE superconductivity in a low carrier density regime, which was
+recently discovered in doped SrTiO$_3$. It is demonstrated that the FE
+superconducting state can be stable in this regime in the absence of the
+magnetic field. Our results open a way to control the electric polarization by
+superconductivity, that is, superconducting multiferroics.",1803.07279v3
+2018-03-20,Topological phase transition with nanoscale inhomogeneity in (Bi$_{1-x}$In$_{x}$)$_{2}$Se$_{3}$,"Topological insulators are a class of band insulators with non-trivial
+topology, a result of band inversion due to the strong spin-orbit coupling. The
+transition between topological and normal insulator can be realized by tuning
+the spin-orbit coupling strength, and has been observed experimentally.
+However, the impact of chemical disorders on the topological phase transition
+was not addressed in previous studies. Herein, we report a systematic scanning
+tunneling microscopy/spectroscopy and first-principles study of the topological
+phase transition in single crystals of In doped Bi$_2$Se$_3$. Surprisingly, no
+band gap closure was observed across the transition. Furthermore, our
+spectroscopic-imaging results reveal that In defects are extremely effective
+""suppressors"" of the band inversion, which leads to microscopic phase
+separation of topological-insulator-like and normal-insulator-like nano regions
+across the ""transition"". The observed topological electronic inhomogeneity
+demonstrates the significant impact of chemical disorders in topological
+materials, shedding new light on the fundamental understanding of topological
+phase transition.",1803.07481v1
+2018-03-22,On the Emergence of Topologically Protected Boundary States in Topological/Normal Insulator Heterostructures,"We have performed a systematic investigation of the formation of
+topologically protected boundary states (TPBS) in topological/normal insulators
+(TI/NI) heterostructures. Using a recently developed scheme to construct {\it
+ab-initio} tight-binding Hamiltonian matrices from density functional theory
+(DFT) calculations, we studied systems of realistic size with high accuracy and
+control over the relevant parameters such as TI and NI band alignment, NI gap
+and spin-orbit coupling strength. Our findings point to the existence of an NI
+critical thickness for the emergence of TPBS and to the importance of the band
+alignment between the TI and NI for the appearance of the TPBS. We chose
+Bi$_{2}$Se$_{3}$ as a prototypical case where the topological/normal insulator
+behavior is modeled by regions with/without spin-orbit coupling. Finally, we
+validate our approach comparing our model with fully relativistic DFT
+calculations for TI/NI heterostructures of Bi$_{2}$Se$_{3}$/Sb$_{2}$Se$_{3}$.",1803.08587v1
+2018-06-06,Negative magnetoresistance suppressed through topological phase transition in (Cd1-xZnx)3As2 films,"The newly discovered topological Dirac semimetals host the possibilities of
+various topological phase transitions through the control of spin-orbit
+coupling as well as symmetries and dimensionalities. Here, we report a
+magnetotransport study of high-mobility (Cd1-xZnx)3As2 films, where the
+topological Dirac semimetal phase can be turned into a trivial insulator via
+chemical substitution. By high-field measurements with a Hall-bar geometry,
+magnetoresistance components ascribed to the chiral charge pumping have been
+distinguished from other extrinsic effects. The negative magnetoresistance
+exhibits a clear suppression upon Zn doping, reflecting decreasing Berry
+curvature of the band structure as the topological phase transition is induced
+by reducing the spin-orbit coupling.",1806.02302v1
+2018-07-05,Role of Hydrogen in the spin-orbital-entangled quantum liquid candidate H$_3$LiIr$_2$O$_6$,"Motivated by recent reports of H$_3$LiIr$_2$O$_6$ as a spin-orbital-entangled
+quantum liquid, we investigate via a combination of density functional theory
+and non-perturbative exact diagonalization the microscopic nature of its
+magnetic interactions. We find that while the interlayer O-H-O bond geometry
+strongly affects the local magnetic couplings, these bonds are likely to remain
+symmetrical due to large zero-point fluctuations of the H positions. In this
+case, the estimated magnetic model lies close to the classical tricritical
+point between ferromagnetic, zigzag and incommensurate spiral orders, what may
+contribute to the lack of magnetic ordering. However, we also find that
+substitution of H by D (deuterium) as well as disorder-induced inhomogeneities
+destabilize the O-H/D-O bonds modifying strongly the local magnetic couplings.
+These results suggest that the magnetic response in H$_3$LiIr$_2$O$_6$ is
+likely sensitive to both the stoichiometry and microstructure of the samples
+and emphasize the importance of a careful treatment of hydrogen for similar
+systems.",1807.02124v2
+2018-07-06,Parity-mixing superconducting phase in the Rashba-Hubbard model and its topological properties from dynamical mean field theory,"We investigate parity-mixing superconductivity in the two-dimensional Hubbard
+model with Rashba spin-orbit coupling, using Cellular Dynamical Mean-Field
+Theory (CDMFT). A superconducting state with mixed singlet $d$-wave and triplet
+$p$-wave character is found in a wide range of doping. The singlet component
+decreases with the amplitude of the Rashba spin-orbit coupling, whereas the
+triplet component increases, but both disappear at about 20\% doping. The
+effect of a Zeeman field is also investigated; it tends to suppress both types
+of superconductivity, but induces nontrivial topological properties: the
+computed bulk Chern number is nonzero in the mixed superconductivity phase, at
+least in the underdoped region. A strong suppression of the excitation gap
+occurs slightly after optimal doping; this might be the sign of a topological
+transition within the superconducting dome.",1807.02489v1
+2018-07-10,Hall and Faraday effects in interacting multi-band systems with arbitrary band topology and spin-orbit coupling,"A formula for the Hall response of interacting multi-band systems with
+arbitrary band topology and spin-orbit coupling is derived. The formula is
+valid at finite frequency, which is relevant for Faraday rotation, and it takes
+into account all particle-hole vertex corrections. The formula includes both
+three-leg (triangular) and four-leg (rectangular) diagrams. The latter diagrams
+are absent in the single band case. We show that the rectangular diagrams are
+necessary to recover the semiclassical formula for the Hall effect from the
+Kubo formula in the DC limit. They also give the linear response of the
+anomalous Hall effect to an external magnetic field, an effect which goes
+beyond the semiclassical theory. Three- and four-particle scatterings are
+neglected.",1807.03852v2
+2018-07-16,Odd-parity multipole fluctuation and unconventional superconductivity in locally noncentrosymmetric crystal,"A microscopic calculation and symmetry argument reveal superconductivity in
+the vicinity of parity-violating magnetic order. An augmented cluster magnetic
+multipole order in a crystal lacking local space inversion parity may break
+global inversion symmetry, and then, it is classified into an odd-parity
+multipole order. We investigate unconventional superconductivity induced by an
+odd-parity magnetic multipole fluctuation in a two-dimensional two-sublattice
+Hubbard model motivated by Sr$_2$IrO$_4$. We find that even-parity
+superconductivity is more significantly suppressed by a spin-orbit coupling
+than that in a globally noncentrosymmetric system. Consequently, two odd-parity
+superconducting states are stabilized by magnetic multipole fluctuations in a
+large spin-orbit coupling region. Both of them are identified as $Z_2$
+topological superconducting states. The obtained gap function of
+inter-sublattice pairing shows a gapped/nodal structure protected by
+nonsymmorphic symmetry. Our finding implies a new family of odd-parity
+topological superconductors. Candidate materials are discussed.",1807.05707v3
+2018-08-21,"Quantum anomalous vortex and Majorana zero mode in iron-based superconductor Fe(Te,Se)","In topological insulators doped with magnetic ions, spin-orbit coupling and
+ferromagnetism give rise to the quantum anomalous Hall effect. Here we show
+that in s-wave superconductors with strong spin-orbit coupling, magnetic
+impurity ions can generate topological vortices in the absence of external
+magnetic fields. Such vortices, dubbed quantum anomalous vortices, support
+robust Majorana zero-energy modes when superconductivity is induced in the
+topological surface states. We demonstrate that the zero-energy bound states
+observed in Fe(Te,Se) superconductors are possible realizations of the Majorana
+zero modes in quantum anomalous vortices produced by the interstitial magnetic
+Fe. The quantum anomalous vortex matter not only advances fundamental
+understandings of topological defect excitations of Cooper pairing, but also
+provides new and advantageous platforms for manipulating Majorana zero modes in
+quantum computing.",1808.07072v4
+2018-12-05,Effect of photonic spin-orbit coupling on the topological edge modes of a Su-Schrieffer-Heeger chain,"We study the effect of photonic spin-orbit coupling (SOC) in micropillar
+lattices on the topological edge states of a one-dimensional chain with a
+zigzag geometry, corresponding to the Su-Schrieffer-Heeger model equipped with
+an additional internal degree of freedom. The system combines the strong
+hopping anisotropy of the $p$-type pillar modes with the large TE-TM splitting
+in Bragg microcavities. By resolving the photoluminescence emission in energy
+and polarization we probe the effects of the resulting SOC on the spatial and
+spectral properties of the edge modes. We find that the edge modes feature a
+fine structure of states that penetrate by different amounts into the bulk of
+the chain, depending on the strength of the SOC terms present, thereby opening
+a route to manipulation of the topological states in the system.",1812.02034v1
+2018-12-14,Isospin-phonon coupling and Fano-interference in spin-orbit Mott insulator Sr2IrO4,"The isospin-phonon coupling in Sr2IrO4 is investigated by temperature
+dependent phonon Raman scattering. Anomalous behavior in the frequency of all
+studied optical phonons is observed below the magnetic transition temperature
+TN ~240 K. The strongest effect is detected for the A1g mode at 272 cm-1
+associated with the modulation of the Ir-O-Ir bond angle. Additionally, the A1g
+mode at 560 cm-1 shows a Fano asymmetric lineshape sensitive to TN, supporting
+the existence of low-energy (~70 meV) electronic excitations that are
+renormalized by the magnetic order. These results reveal new aspects of the
+interaction between the crystal lattice and electronic degrees of freedom in
+this spin-orbit entangled Mott insulator.",1812.06006v2
+2018-12-18,Cluster State Generation with Spin-Orbit Coupled Fermionic Atoms in Optical Lattices,"Measurement-based quantum computation, an alternative paradigm for quantum
+information processing, uses simple measurements on qubits prepared in cluster
+states, a class of multiparty entangled states with useful properties. Here we
+propose and analyze a scheme that takes advantage of the interplay between
+spin-orbit coupling and superexchange interactions, in the presence of a
+coherent drive, to deterministically generate macroscopic arrays of cluster
+states in fermionic alkaline earth atoms trapped in three dimensional (3D)
+optical lattices. The scheme dynamically generates cluster states without the
+need of engineered transport, and is robust in the presence of holes, a typical
+imperfection in cold atom Mott insulators. The protocol is of particular
+relevance for the new generation of 3D optical lattice clocks with coherence
+times $>10$ s, two orders of magnitude larger than the cluster state generation
+time. We propose the use of collective measurements and time-reversal of the
+Hamiltonian to benchmark the underlying Ising model dynamics and the generated
+many-body correlations.",1812.07686v2
+2018-12-20,Thermopower generation and thermoelectric cooling in a Kane-Mele normal-insulator-superconductor nano-junction,"We have studied thermoelectric effect of a Kane-Mele
+normal-insulator-superconductor (KMNIS) junction at ultra-low temperatures
+using a modified version of the well-known Blonder-Tinkham-Klapwijk (BTK)
+theory. Since both the (electronic) charge and thermal current due to the
+carriers are sensitive to the strengths of the spin-orbit coupling (SOC)
+present in the Kane-Mele model, a tunability of this junction device with
+regard to its thermoelectric properties can be experimentally achieved by
+certain techniques that are used to manipulate the values of the spin-orbit
+couplings. We have computed the Seebeck coefficient, the Figure of Merit, the
+thermoelectric cooling, the coefficient of performance of the KMNIS junction as
+a self-cooling device and investigated the role of the Rashba SOC (RSOC) and
+intrinsic SOC (ISOC) parameters therein. Our results on the thermoelectric
+cooling indicate practical realizability and usefulness for efficient cooling
+detectors, sensors, and quantum devices and hence could be crucial to
+experimental success of the thermoelectric applications of such junction
+devices. Further we have briefly touched upon the condition that distinguishes
+transmission through a topological insulator from an ordinary one.",1812.08381v1
+2019-01-04,Weak ferromagnetic insulator with huge coercivity in monoclinic double perovskite La2CuIrO6,"Insulating ferromagnets with high TC are required for many new magnetic
+devices. More complexity arises when strongly correlated 3d ions coexist with
+strongly spin-orbit coupled 5d ones in a double perovskite. Here, we perform
+the structural, magnetic, and density functional theory study of such double
+perovskite La2CuIrO6. A new P21/n polymorph is found according to the
+comprehensive analysis of x-ray, Raman scattering and phonon spectrum. The
+magnetization reveals a weak ferromagnetic (FM) transition at TC = 62 K and
+short range FM order in higher temperature range. A huge coercivity is found as
+high as HC~11.96 kOe at 10K, which in combination with the negative trapped
+field results in the magnetization reversal in the zero field cooling
+measurement. The first principle calculations confirm the observed FM state and
+suggest La2CuIrO6 of this polymorph is a Mott insulating ferromagnet assisted
+by the spin-orbit coupling.",1901.01106v4
+2019-01-04,The gate-tunable strong and fragile topology of multilayer-graphene on a transition metal dichalcogenide,"We analyze the phase diagram of multilayer-graphene sandwiched between
+identical transition metal dichalcogenides. Recently realized in all
+van-der-Wall heterostructures, these sandwiches induce sizable (1-15 meV) spin
+orbit coupling in the graphene, offering a way to engineer topological
+band-structures in a pristine and gate-tunable platform. We find a rich phase
+diagram that depends on the number of layers $N$ and the gate-tunable
+perpendicular electric field. For $N > 1$ and odd, the system is a strong 2D
+topological insulator with a gap equal to the strength of proximity-induced
+Ising spin-orbit coupling, which reverts to a trivial phase at moderate
+electric fields. For $N$-even, the low energy bands exhibit a recently proposed
+form of ""fragile"" crystalline topology, as well as electric-field tuned
+symmetry-protected phase transitions between distinct atomic insulators. Hence
+AB-stacked bilayer and ABC-stacked trilayer graphene are predicted to provide
+controllable experimental realizations of fragile and strong topology.",1901.01294v2
+2019-01-09,Angular Stripe Phase in Spin-Orbital-Angular-Momentum Coupled Bose Condensates,"We propose that novel superfluid with supersolid-like properties - angular
+stripe phase - can be realized in a pancake-like spin-1/2 Bose gas with
+spin-orbital-angular-momentum coupling. We predict a rich ground-state phase
+diagram, including the vortex-antivortex pair phase, half-skyrmion phase, and
+two different angular stripe phases. The stripe phases feature modulated
+angular density-density correlation with sizable contrast and can occupy a
+relatively large parameter space. The low-lying collective excitations, such as
+the dipole and breathing modes, show distinct behaviors in different phases.
+The existence of the novel stripe phase is also clearly indicated in the
+energetic and dynamic instabilities of collective modes near phase transitions.
+Our predictions of the angular stripe phase could be readily examined in
+current cold-atom experiments with $^{87}$Rb and $^{41}$K.",1901.02595v3
+2019-01-18,Four-wave mixing in spin-orbit coupled Bose-Einstein condensates,"We describe possibilities of spontaneous, degenerate four-wave mixing (FWM)
+processes in spin-orbit coupled Bose-Einstein condensates. Phase matching
+conditions (i.e., energy and momentum conservation laws) in such systems allow
+one to identify four different configurations characterized by involvement of
+distinct spinor states in which such a process can take place. We derived these
+conditions from first principles and then illustrated dynamics with direct
+numerical simulations. We found, among others, the unique configuration, where
+both probe waves have smaller group velocity than pump wave and proved
+numerically that it can be observed experimentally under proper choice of the
+parameters. We also reported the case when two different FWM processes can
+occur simultaneously. The described resonant interactions of matter waves is
+expected to play important role in the experiments of BEC with artificial gauge
+fields. Beams created by FWM processes are important source of correlated
+particles and can be used the experiments testing quantum properties of atomic
+ensembles.",1901.06173v3
+2019-01-30,Electronic structure of full-shell InAs/Al hybrid semiconductor-superconductor nanowires: Spin-orbit coupling and topological phase space,"We study the electronic structure of full-shell superconductor-semiconductor
+nanowires, which have recently been proposed for creating Majorana zero modes,
+using an eight-band $\vec{k} \cdot \vec{p}$ model within a fully
+self-consistent Schr\""{o}dinger-Poisson scheme. We find that the spin-orbit
+coupling induced by the intrinsic radial electric field is generically weak for
+sub-bands with their minimum near the Fermi energy. Furthermore, we show that
+the chemical potential windows consistent with the emergence of a topological
+phase are small and sparse and can only be reached by fine tunning the diameter
+of the wire. These findings suggest that the parameter space consistent with
+the realization of a topological phase in full-shell InAs/Al nanowires is, at
+best, very narrow.",1901.11005v1
+2019-03-13,Nonlinear management of topological solitons in a spin-orbit-coupled system,"We consider possibilities to control dynamics of solitons of two types,
+maintained by the combination of cubic attraction and spin-orbit coupling (SOC)
+in a two-component system, namely, semi-dipoles (SDs) and mixed modes (MMs), by
+making the relative strength of the cross-attraction, gamma, a function of time
+periodically oscillating around the critical value, gamma = 1, which is an
+SD/MM stability boundary in the static system. The structure of SDs is
+represented by the combination of a fundamental soliton in one component and
+localized dipole mode in the other, while MMs combine fundamental and dipole
+terms in each component. Systematic numerical analysis reveals a finite
+bistability region for the SDs and MMs around gamma = 1, which does not exist
+in the absence of the periodic temporal modulation (""management""), as well as
+emergence of specific instability troughs and stability tongues for the
+solitons of both types, which may be explained as manifestations of resonances
+between the time-periodic modulation and intrinsic modes of the solitons. The
+system can be implemented in Bose-Einstein condensates, and emulated in
+nonlinear optical waveguides.",1903.05279v1
+2019-04-07,Anomalous ground state properties of SmB6 -- a density functional theoretical study,"We studied the electronic structure of SmB6 employing density functional
+theory (DFT) using different exchange potentials, spin-orbit coupling (SOC) and
+electron correlation (U = correlation strength). All the calculations carried
+out in this study converge to metallic ground state indicating bulk metallicity
+in SmB6, which is in line with the low temperature anomalies observed in this
+system. We show that while spin-orbit coupling and electron correlation is
+important to capture the ground state properties, generalized gradient
+approximation provides the best description of the Sm 4f multiplets observed in
+angle-resolved photoemission spectroscopy (ARPES) data. The Fermi surface plots
+exhibit electron and hole pockets having dominant Sm 4f character; the
+observation of these Fermi surfaces is consistent with the recent quantum
+oscillation measurements. In addition to primarily Sm 4f contributions observed
+at the Fermi level, we discover significantly large contribution from B 2p
+states compared to weak Sm 5d contributions. This suggests important role of B
+2p - Sm 4f hybridization in the exotic physics of this system.",1904.03594v2
+2019-04-15,Magnetic response of Sr$_2$RuO$_4$: quasi-local spin fluctuations due to Hund's coupling,"We study the magnetic susceptibility in the normal state of Sr$_2$RuO$_4$
+using dynamical mean-field theory including dynamical vertex corrections.
+Besides the well known incommensurate response, our calculations yield
+quasi-local spin fluctuations which are broad in momentum and centered around
+the $\Gamma$ point, in agreement with recent inelastic neutron scattering
+experiments [P. Steffens, et al., Phys. Rev. Lett. 122, 047004 (2019)]. We show
+that these quasi-local fluctuations are controlled by the Hund's coupling and
+account for the dominant contribution to the momentum-integrated response.
+While all orbitals contribute equally to the incommensurate response, the
+enhanced $\Gamma$ point response originates from the planar xy orbital.",1904.07324v1
+2019-08-09,Magnetic phase transitions of insulating spin-orbit coupled Bose atoms in one-dimensional optical lattices,"We consider the insulating spin-orbit coupled Bose atoms confined within
+one-dimensional optical lattices and explore their ground-state magnetic phase
+transitions. Under strong interactions, the charge degrees of atoms are frozen
+and the system can be described by an anisotropic XXZ Heisenberg chain with
+Dzyaloshinskii-Moriya interaction and transverse field. We apply the matrix
+product state method to obtain low-energy states and analyze the lowest energy
+gaps and the ground-state magnetization and correlations. We find when the
+transverse field is absent, the ground state is a gapped ferromagnetic phase
+with long-range correlation in the z direction if the interspin s-wave
+interacting strength is stronger than that of the intraspin one, otherwise it
+is a gapless Luttinger liquid (LL) phase with algebraic decaying correlation.
+When the transverse field is turned on, the gapless LL phase is broken, there
+emerges a long-range correlated phase with ferromagnetic, antiferromagnetic or
+spiral order, which depends on the DM interaction strength. We believe our
+study provides a complete understanding of the interplay between SOC and
+quantum magnetism of spinor atoms in optical lattices.",1908.03300v1
+2019-08-26,Vectorial nonlinear optics: type-II second-harmonic generation driven by spin-orbit coupled fields,"Vectorial nonlinear optics refers to the investigation of optical processes
+whose nonlinear polarization (NP) undergoes spin-orbit coupling (SOC)
+interactions where, in general, the driving light field or the new field
+generated by the interaction containing the SOC property. To contribute to
+fundamental knowledge in this domain, we examine the type-II second harmonic
+generation (SHG) induced by vectorial laser modes. First, we provide a general
+theory to analyze the vectorial SHG process. Second, by using two typical
+vector modes as examples, we show how the SOC of the pump field dictates
+nonlinear interaction. Finally, we corroborate our theoretical predictions
+through experiments to confirm the crucial role of the SOC in nonlinear
+interactions. These results enhance our fundamental understanding of
+SOC-mediated nonlinear optics and lay the foundation for further fundamental
+studies as well as possible applications.",1908.09437v2
+2019-11-09,Interaction-Range Effects and Universality in the BCS-BEC Crossover of Spin-Orbit Coupled Fermi Gases,"We explore the evolution of a ultracold quantum gas of interacting fermions
+crossing from a Bardeen-Cooper-Schrieffer (BCS) superfluidity to a
+Bose-Einstein condensation (BEC) of molecular bosons in the presence of a
+tunable-range interaction among the fermions and of an artificial magnetic
+field, which can be used to simulate a pseudo-spin-orbit coupling (SOC) and to
+produce topological states. We find that the crossover is affected by a
+competition between the finite range of the interaction and the SOC and that
+the threshold $\lambda_B$ for the topological transition is affected by the
+interactions only in the small pair size, BEC-like, regime. Below $\lambda_B$,
+we find persistence of universal behavior in the critical temperature, chemical
+potential, and condensate fraction, provided that the pair correlation length
+is used as a driving parameter. Above threshold, universality is lost in the
+regime of large pair sizes. Here, the limiting ground state departs from a
+weakly-interacting BCS-like, so that a different description is required. Our
+results can be relevant in view of current experiments with cold atoms in
+optical cavities, where tunable-range effective atomic interactions can be
+engineered.",1911.03657v1
+2019-12-12,Multidimensional hybrid Bose-Einstein condensates stabilized by lower-dimensional spin-orbit coupling,"We show that attractive spinor Bose-Einstein condensates under the action of
+spin-orbit coupling (SOC) and Zeeman splitting form self-sustained stable two-
+and three-dimensional (2D and 3D) states in free space, even when SOC acts in a
+lower-dimensional form. We find that two-dimensional states are stabilized by
+one-dimensional (1D) SOC in a broad range of chemical potentials, for atom
+numbers (or norm of the spinor wavefunction) exceeding a threshold value, which
+strongly depends on the SOC strength and vanishes at a critical point. The
+zero-threshold point is a boundary between single-peaked and striped states,
+realizing hybrids combining 2D and 1D structural features. In a vicinity of
+such point, an asymptotic equation describing the bifurcation of the solitons
+from the linear spectrum is derived and investigated analytically. We show that
+striped 3D solitary states are as well stabilized by 2D SOC, albeit in a
+limited range of chemical potentials and norms.",1912.05880v1
+2020-05-09,Quest for New Quantum States via Field-Editing Technology,"We report new quantum states in spin-orbit-coupled single crystals that are
+synthesized using a game-changing technology that ""field-edits"" crystal
+structures (borrowing from the phrase ""genome editing"") via application of
+magnetic field during crystal growth. This study is intended to fundamentally
+address a major challenge facing the research community today: A great deal of
+theoretical work predicting exotic states for strongly spin-orbit-coupled,
+correlated materials has thus far met very limited experimental confirmation.
+These conspicuous discrepancies are due chiefly to the extreme sensitivity of
+these materials to structural distortions. The results presented here
+demonstrate that the ""field-edited"" materials not only are much less distorted
+but also exhibit novel phenomena absent in their ""non-edited"" counterparts. The
+field-edited materials include an array of 4d and 5d transition metal oxides,
+and three representative materials presented here are Ba4Ir3O10, Ca2RuO4, and
+Sr2IrO4. This study provides an entirely new paradigm for discovery of new
+quantum states and materials otherwise unavailable.",2005.04327v3
+2020-10-21,Three-dimensional non-Abelian generalizations of the Hofstadter model: spin-orbit-coupled butterfly trios,"We theoretically introduce and study a three-dimensional Hofstadter model
+with linearly varying non-Abelian gauge potentials along all three dimensions.
+The model can be interpreted as spin-orbit coupling among a trio of Hofstadter
+butterfly pairs since each Cartesian surface ($xy$, $yz$, or $zx$) of the model
+reduces to a two-dimensional non-Abelian Hofstadter problem. By evaluating the
+commutativity among arbitrary loop operators around all axes, we derive its
+genuine (necessary and sufficient) non-Abelian condition, namely, at least two
+out of the three hopping phases should be neither 0 nor $\pi$. Under different
+choices of gauge fields in either the Abelian or the non-Abelian regime, both
+weak and strong topological insulating phases are identified in the model.",2010.11308v2
+2021-04-23,Rotation of optically bound particle assembly due to scattering induced spin-orbit coupling of light,"The optical binding of many particles has great potential to achieve the
+wide-area formation of a ""crystal"" of small materials. Unlike conventional
+optical binding, where the whole assembly of targeted particles is irradiated
+with light, if one can indirectly manipulate remote particles using a single
+trapped particle through optical binding, the degrees of freedom to create
+ordered structures will be greatly enhanced. In this Letter, we theoretically
+investigate the dynamics of the assembly of gold nanoparticles that is
+manipulated using a single particle trapped by a focused laser. As a result, we
+demonstrate that the spin--orbit coupling and angular momentum generation of
+light via scattering induce the assembly and rotational motion of particles
+through indirect optical force. This result opens the possibility of creating
+ordered structures with a wide area and manipulating them, controlling local
+properties using scanning laser beams.",2104.11387v1
+2015-08-17,"Emergence of non-Fermi liquid behaviors in 5d perovskite SrIrO3 thin films: interplay between correlation, disorder, and spin-orbit coupling","We investigate the effects of compressive strain on the electrical
+resistivity of 5d iridium based perovskite SrIrO3 by depositing epitaxial films
+of thickness 35 nm on various substrates such as GdScO3 (110), DyScO3 (110),
+and SrTiO3 (001). Surprisingly, we find anomalous transport behaviors in the
+tempeature dependent resistivity, where the temperature exponent evolves
+continuously from 4/5 to 1 and to 3/2 with an increase of compressive strain.
+Furthermore, magnetoresistance always remains positive irrespective of
+resistivity upturns at low temperatures. These observations imply that the
+delicate interplay between correlation and disorder in the presence of strong
+spin-orbit coupling is responsible for the emergence of the non-Fermi liquid
+behaviors in 5d perovskite SrIrO3 thin films. We offer a theoretical framework
+for the interpretation of the experimental results.",1508.03944v1
+2015-08-27,Spin-orbit-coupled Bose-Einstein-condensed atoms confined in annular potentials,"A spin-orbit-coupled Bose-Einstein-condensed cloud of atoms confined in an
+annular trapping potential shows a variety of phases that we investigate in the
+present study. Starting with the non-interacting problem, the homogeneous phase
+that is present in an untrapped system is replaced by a sinusoidal density
+variation in the limit of a very narrow annulus. In the case of an untrapped
+system there is another phase with a striped-like density distribution, and its
+counterpart is also found in the limit of a very narrow annulus. As the width
+of the annulus increases, this picture persists qualitatively. Depending on the
+relative strength between the inter- and the intra-components, interactions
+either favor the striped phase, or suppress it, in which case either a
+homogeneous, or a sinusoidal-like phase appears. Interactions also give rise to
+novel solutions with a nonzero circulation.",1508.06761v2
+2016-03-17,J$_{eff}$ description of the honeycomb Mott insulator $α$-RuCl$_3$,"Novel ground states might be realized in honeycomb lattices with strong
+spin-orbit coupling. Here we study the electronic structure of
+${\alpha}$-RuCl$_3$, in which the Ru ions are in a d5 configuration and form a
+honeycomb lattice, by angle-resolved photoemission, x-ray photoemission and
+electron energy loss spectroscopy supported by density functional theory and
+multiplet calculations. We find that ${\alpha}$-RuCl$_3$ is a Mott insulator
+with significant spin-orbit coupling, whose low energy electronic structure is
+naturally mapped onto Jeff states. This makes ${\alpha}$-RuCl$_3$ a promising
+candidate for the realization of Kitaev physics. Relevant electronic parameters
+such as the Hubbard energy U, the crystal field splitting 10Dq and the charge
+transfer energy are evaluated. Furthermore, we observe significant Cl
+photodesorption with time, which must be taken into account when interpreting
+photoemission and other surface sensitive experiments.",1603.05507v1
+2016-03-29,Yu-Shiba-Rusinov states and topological superconductivity in Ising paired superconductors,"An unusual form of superconductivity, called Ising superconductivity, has
+recently been uncovered in mono- and few-layered transition metal
+dichalcogenides. This 2D superconducting state is characterized by the
+so-called Ising spin-orbit coupling (SOC), which produces strong oppositely
+oriented effective Zeeman fields perpendicular to the 2D layer in opposite
+momentum space valleys. We examine the Yu-Shiba-Rusinov (YSR) bound states
+localized at magnetic impurities in Ising superconductors and show that the
+unusual SOC manifests itself in unusually strong anisotropy in magnetic field
+response of zero bias conductance peaks observable in STM experiments on
+impurity sites. For a chain of magnetic impurities with moments parallel to the
+plane of Ising superconductors we show that the low energy YSR band can host
+topological superconductivity and Majorana fermions as a direct manifestation
+of Ising spin-orbit coupling induced topological effects.",1603.08909v2
+2016-03-31,Superconductivity in magnetic multipole states,"Stimulated by recent studies of superconductivity and magnetism with local
+and global broken inversion symmetry, we investigate the superconductivity in
+magnetic multipole states in locally noncentrosymmetric metals. We consider a
+one-dimensional zigzag chain with sublattice-dependent antisymmetric spin-orbit
+coupling and suppose three magnetic multipole orders: monopole order, dipole
+order, and quadrupole order. It is demonstrated that the
+Bardeen-Cooper-Schrieffer state, the pair-density wave (PDW) state, and the
+Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state are stabilized by these multipole
+orders, respectively. We show that the PDW state is a topological
+superconducting state specified by the nontrivial $\mathbb{Z}_2$ number and
+winding number. The origin of the FFLO state without macroscopic magnetic
+moment is attributed to the asymmetric band structure induced by the magnetic
+quadrupole order and spin-orbit coupling.",1603.09440v3
+2016-10-26,Observation of the supersolid stripe phase in spin-orbit coupled Bose-Einstein condensates,"Supersolidity is an intriguing concept. It combines the property of
+superfluid flow with the long-range spatial periodicity of solids, two
+properties which are often mutually exclusive. The original discussion of
+quantum crystals and supersolidity focuses on solid Helium-4 where it was
+predicted that vacancies could form dilute weakly interacting Bose-Einstein
+condensates. In this system, direct observation of supersolidity has been
+elusive. The concept of supersolidity was then generalized to include other
+superfluid systems which break the translational symmetry of space. One of such
+systems is a Bose-Einstein condensate with spin-orbit coupling which has a
+supersolid stripe phase. Despite several recent studies of this system, the
+stripe phase has not been observed. Here we report the direct observation of
+the predicted density modulation of the stripe phase using Bragg reflection.
+Our work establishes a system with unique symmetry breaking properties. Of
+future interest is further spatial symmetry breaking through the introduction
+of vortices, solitons, impurities or disorder.",1610.08194v2
+2016-10-29,Spin-orbit-coupled Bose-Einstein condensates held under toroidal trap,"We study a quasispin-$1/2$ Bose-Einstein condensate with synthetically
+generated spin-orbit coupling in a toroidal trap, and show that the system has
+a rich variety of ground and metastable states. As the central hole region
+increases, i.e., the potential changes from harmonic-like to ring-like, the
+condensate exhibits a variety of structures, such as triangular stripes,
+flower-petal patterns, and counter-circling states. We also show that the
+rotating systems have exotic vortex configurations. In the limit of a quasi-one
+dimensional ring, the quantum many-body ground state is obtained, which is
+found to be the fragmented condensate.",1610.09458v1
+2016-10-31,A critical point in Sr2-xIrO4 and less distorted IrO6 octahedra induced by deep Sr-vacancies,"For the Sr2-xIrO4 system, recent work pointed out the abnormal electronic and
+magnetic properties around the critical point. Here, to understand Sr-vacancy
+effect on spin-orbit coupled Mott insulator Sr2IrO4, the electronic structure
+and local structure distortion for Sr2-xIrO4 system have been investigated by
+x-ray absorption spectroscopy (XAS). By comparing the intensity of white-line
+features at the IrL2,3-edge x-ray absorption near-edge spectroscopy (XANES), we
+observe a sudden rise of the branching ratio in the vicinity of the critical
+point.Further analysis on theIrL3 -edge extended x-ray absorption fine
+structure (EXAFS) and calculated data demonstrated that the abrupt enhancement
+of the branching ratio is intimately related to the less distorted IrO6
+octahedra induced by deep Sr-vacancies, which in turn alters the relatively
+strength of the spin-orbit coupling (SOC) and crystal electric field (CEF)that
+would dictate the abnormal behavior of electronic and magnetic structure near
+the critical point.",1610.09817v1
+2016-12-02,Comment on Influence of induced interactions on superfluid properties of quasi-two-dimensional dilute Fermi gases with spin-orbit coupling,"In an article in 2013, Caldas et al. [Phys. Rev. A 88, 023615 (2013)] derived
+analytical expressions of the induced interaction within the scheme of Gorkov
+and Melik-Barkhudrov in quasi-two-dimensional Fermi gases with Rashba
+spin-orbit coupling (SOC). They claimed that the induced interaction is exactly
+the same as the one for the case without SOC when the SOC is weak, and in the
+region of strong SOC, it starts from a reduced value and then recovers the
+value for the zero SOC in the limit of large SOC. We point out that their
+calculations contain the critical errors and inconsistencies that significantly
+affect the basis of these claims.",1612.00600v1
+2016-12-06,Laser-induced topological superconductivity in cuprate thin films,"We propose a possible way to realize topological superconductivity with
+application of laser light to superconducting cuprate thin films. Applying
+Floquet theory to a model of $d$-wave superconductors with Rashba spin-orbit
+coupling, we derive an effective model and discuss its topological nature.
+Interplay of the Rashba spin-orbit coupling and the laser light effect induces
+the synthetic magnetic fields, thus making the system gapped. Then the system
+acquires the topologically non-trivial nature which is characterized by Chern
+numbers. The effective magnetic fields do not create the vortices in
+superconductors, and thus the proposed scheme provides a promising way to
+dynamically realize a topological superconductor in cuprates. We also discuss
+an experimental way to detect the signature.",1612.01596v1
+2016-12-14,Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7,"The 5d-transition metal pyrochlore oxide Cd2Re2O7, which was recently
+suggested to be a prototype of the spin-orbit-coupled metal [Phys. Rev. Lett.
+115, 026401 (2015)], exhibits an inversion-symmetry breaking (ISB) transition
+at 200 K and a subsequent superconductivity below 1 K at ambient pressure. We
+study the crystal structure at high pressures up to 5 GPa by means of
+synchrotron X-ray powder diffraction. A rich structural phase diagram is
+obtained, which contains at least seven phases and is almost consistent with
+the electronic phase diagram determined by previous resistivity measurements.
+Interestingly, the ISB transition vanishes at ~4 GPa, where the enhancement of
+the upper critical field was observed in resistivity. Moreover, it is shown
+that the point groups at 8 K, probably kept in the superconducting phases,
+sequentially transform into piezoelectric, ferroelectric, and centrosymmetric
+structures on the application of pressure.",1612.04577v2
+2019-05-17,Symmetry-protected metallic and topological phases in penta-materials,"We analyze the symmetry and topological features of a family of materials
+closely related to penta-graphene, derived from it by adsorption or
+substitution of different atoms. Our description is based on a novel approach,
+called topological quantum chemistry, that allows to characterize the topology
+of the electronic bands, based on the mapping between real and reciprocal
+space.
+  In particular, by adsorption of alkaline (Li or Na) atoms we obtain a nodal
+line metal at room temperature, with a continuum of Dirac points around the
+perimeter of the Brillouin zone. This behavior is also observed in some
+substitutional derivatives of penta-graphene, such as penta-PC$_2$.
+  Breaking of time-reversal symmetry can be achieved by the use of magnetic
+atoms; we study penta-MnC$_2$, which also presents spin-orbit coupling and
+reveals a topological insulator phase.
+  We find that for this family of materials, symmetry is the source of
+protection for metallic and nontrivial topological phases that can be
+associated to the presence of fractional band filling, spin-orbit coupling and
+time-reversal symmetry breaking.",1905.07381v1
+2019-05-29,Gate Controlled Anomalous Phase Shift in Al/InAs Josephson Junctions,"In a standard Josephson junction the current is zero when the phase
+difference between the superconducting leads is zero. This condition is
+protected by parity and time-reversal symmetries. However, the combined
+presence of spin-orbit coupling and magnetic field breaks these symmetries and
+can lead to a finite supercurrent even when the phase difference is zero. This
+is the so called anomalous Josephson effect -- the hallmark effect of
+superconducting spintronics --and can be characterized by the corresponding
+anomalous phase shift ($\phi_0$). We report the observation of a tunable
+anomalous Josephson effect in InAs/Al Josephson junctions measured via a
+superconducting quantum interference device (SQUID). By gate controlling the
+density of InAs we are able to tune the spin-orbit coupling of the Josephson
+junction by more than one order of magnitude. This gives us the ability to tune
+$\phi_0$, and opens several new opportunities for superconducting spintronics,
+and new possibilities for realizing and characterizing topological
+superconductivity.",1905.12670v1
+2020-03-03,Topological superconductivity in carbon nanotubes with a small magnetic flux,"We show that a one-dimensional topological superconductor can be realized in
+carbon nanotubes, using a relatively small magnetic field. Our analysis relies
+on the intrinsic curvature-enhanced spin-orbit coupling of the nanotubes, as
+well as on the orbital effect of a magnetic flux threaded through the nanotube.
+Tuning experimental parameters, we show that a half-metallic state may be
+induced in the nanotube. Coupling the system to an Ising superconductor, with
+an appreciable spin-triplet component, can then drive the nanotube into a
+topological superconducting phase. The proposed scheme is investigated by means
+of real-space tight-binding simulations, accompanied by an effective continuum
+low-energy theory, which allows us to gain some insight on the roles of
+different terms in the Hamiltonian. We calculate the topological phase diagram
+and ascertain the existence of localized Majorana zero modes near the edges.
+Moreover, we find that in the absence of a magnetic field, a regime exists
+where sufficiently strong interactions drive the system into a
+time-reversal-invariant topological superconducting phase.",2003.01730v1
+2020-03-26,Chiral Domain Wall Injector Driven by Spin-orbit Torques,"Memory and logic devices that encode information in magnetic domains rely on
+the controlled injection of domain walls to reach their full potential. In this
+work, we exploit the chiral coupling induced by the Dzyaloshinskii-Moriya
+interaction between in-plane and out-of-plane magnetized regions of a
+Pt/Co/AlO\textsubscript{x} trilayer in combination with current-driven
+spin-orbit torques to control the injection of domain walls into magnetic
+conduits. We demonstrate that the current-induced domain nucleation is strongly
+inhibited for magnetic configurations stabilized by the chiral coupling and
+promoted for those that have the opposite chirality. These configurations allow
+for efficient domain wall injection using current densities of the order of
+$4\times$\SI{e11}{A m^{-2}}, which are lower than those used in other injection
+schemes. Furthermore, by setting the orientation of the in-plane magnetization
+using an external field, we demonstrate the use of a chiral domain wall
+injector to create a controlled sequence of alternating domains in a racetrack
+structure driven by a steady stream of unipolar current pulses.",2003.11805v1
+2020-06-03,Topological Nodal Line Electrides: Realization of Ideal Nodal Line State Nearly Immune from Spin-Orbit Coupling,"Nodal line semimetals (NLSs) have attracted broad interest in current
+research. In most of existing NLSs, the intrinsic properties of nodal lines are
+greatly destroyed because nodal lines usually suffer sizable gaps induced by
+non-negligible spin-orbit coupling (SOC). In this work,we propose the
+topological nodal line electrides (TNLEs), which achieve electronic structures
+of nodal lines and electrides simultaneously, provide new insight on designing
+excellent NLSs nearly immune from SOC. Since the states near the Fermi level
+are most contributed by nonnucleus-bounded interstitial electrons, nodal lines
+in TNLEs manifest extremely small SOCinduced gap even possessing heavy
+elements. Especially, we propose the family of A2B (A = Ca, Sr, Ba; B= As, Sb,
+Bi) materials are realistic TNLEs with negligible SOC-induced gaps, which can
+play as excellent platforms to study the intrinsic properties of TNLEs",2006.02019v1
+2020-06-12,Majorana corner pairs in a two-dimensional $s$-wave cold atomic superfluid,"We propose a method to prepare Majorana pairs at the corners of imprinted
+defects on a two-dimensional cold atom optical lattice with $s$-wave superfluid
+pairing. Different from previous proposals that manipulate the effective Dirac
+masses, our scheme relies on the sign flip of the spin-orbit coupling at the
+corners, which can be tuned in experiments by adjusting the angle of incident
+Raman lasers. The Majorana corner pairs are found to be located at the
+interface between two regimes with opposite spin orbit coupling strengths in an
+anticlockwise direction and are robust against certain symmetry-persevered
+perturbations. Our work provides a new way for implementing and manipulating
+Majorana pairs with existing cold-atom techniques.",2006.06905v1
+2020-09-26,"First-Principles Prediction of Graphene-Like XBi (X=Si, Ge, Sn) Nanosheets","Research progress on single-layer group III monochalcogenides have been
+increasing rapidly owing to their interesting physics. Herein, we predict the
+dynamically stable single-layer forms of XBi (X=Ge, Si, or Sn) by using density
+functional theory calculations. Phonon band dispersion calculations and
+ab-initio molecular dynamics simulations reveal the dynamical and thermal
+stability of predicted nanosheets. Raman spectra calculations indicate the
+existence of 5 Raman active phonon modes 3 of which are prominent and can be
+observed in a possible Raman measurement. Electronic band structures of the XBi
+single-layers investigated with and without spin-orbit coupling effects (SOC).
+Our results show that XBi single-layers show semiconducting property with the
+narrow band gap values without SOC. However only the single-layer SiBi is an
+indirect band gap semiconductor while GeBi and SnBi exhibit metallic behaviors
+by adding spin-orbit coupling effects. In addition, the calculated
+linear-elastic parameters indicate the soft nature of predicted monolayers.
+Moreover, our predictions for the thermoelectric properties of single-layer XBi
+reveal that SiBi is a good thermoelectric material with increasing temperature.
+Overall, it is proposed that single-layer XBi structures can be alternative,
+stable 2D single-layers with their varying electronic and thermoelectric
+properties.",2009.12561v1
+2021-01-21,Unusual $H$-$T$ phase diagram of CeRh$_2$As$_2$ -- the role of staggered non-centrosymmetricity,"Superconductivity in a crystalline lattice without inversion is subject to
+complex spin-orbit-coupling effects, which can lead to mixed-parity pairing and
+an unusual magnetic response. In this study, the properties of a layered
+superconductor with alternating Rashba spin-orbit coupling in the stacking of
+layers, hence (globally) possessing a center of inversion, is analyzed in an
+applied magnetic field, using a generalized Ginzburg-Landau model. The
+superconducting order parameter consists of an even- and an odd-parity pairing
+component which exchange their roles as dominant pairing channel upon
+increasing the magnetic field. This leads to an unusual kink feature in the
+upper critical field and a first-order phase transition within the mixed phase.
+We investigate various signatures of this internal phase transition. The
+physics we discuss here could explain the recently found $H$--$T$ phase diagram
+of the heavy Fermion superconductor CeRh$_2$As$_2$.",2101.08821v2
+2021-03-03,Strained BiFeO$_{3}$ perovskite structure for enhanced photovoltaic effect,"BiFeO$_{3}$ is multiferroic material with space group Pbnm exhibits coupling
+of both magnetic and electric orders under strain force. To analyze band gap
+Tauc plot extrapolation method is used $\&$ remarkably smaller than some
+reported literature values for space group R3c structure. The dielectric
+function $\varepsilon(\omega)$ demonstrated that light energy upon transition
+through BiFeO$_{3}$ has shown a decline inconsistent pattern with index of
+refraction variation in range of 13 to 8, 8 to 5, 5 to 3, $\&$ 3 to 1 as per
+photon energy. Moreover, non crossing degenerate energy level and hybridized
+spin-orbit interaction lead to linear dispersion relation which is typical
+photonic nature with zero DM interaction. Thus, BiFeO$_{3}$ could exhibit
+photonic property under strain force. Generally strained structure had enhanced
+photovoltaic effect with smaller optical band gap because of
+$Dzyaloshinskii$-$Moriya(DM)$ and spin-orbit coupling interactions.",2103.02194v1
+2021-03-04,Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4,"One way to induce insulator to metal transitions in the spin-orbit Mott
+insulator Sr2IrO4 is to substitute iridium with transition metals (Ru, Rh).
+However, this creates intriguing inhomogeneous metallic states, which cannot be
+described by a simple doping effect. We detail the electronic structure of the
+Ru-doped case with angle-resolved photoemission and show that, contrary to Rh,
+it cannot be connected to the undoped case by a rigid shift. We further
+identify bands below $E_F$ coexisting with the metallic ones that we assign to
+non-bonding Ir sites. We rationalize the differences between Rh and Ru by a
+different hybridization with oxygen, which mediates the coupling to Ir and
+sensitively affects the effective doping. We argue that the spin-orbit coupling
+does not control neither the charge transfer nor the transition threshold.",2103.03056v1
+2021-03-15,Direct observation of the spin-orbit coupling effect in Magnetic Weyl semimetal Co3Sn2S2,"The spin-orbit coupling (SOC) lifts the band degeneracy that plays a vital
+role in the search for different topological states, such as topological
+insulators (TIs) and topological semimetals (TSMs). In TSMs, the SOC can
+partially gap a degenerate nodal line, leading to the formation of Dirac/Weyl
+semimetals (DSMs/WSMs). However, such SOC-induced gap structure along the nodal
+line in TSMs has not yet been systematically investigated experimentally. Here,
+we report a direct observation of such gap structure in a magnetic WSM Co3Sn2S2
+using high resolution angle-resolved photoemission spectroscopy. Our results
+not only reveal the existence and importance of the strong SOC effect in the
+formation of the WSM phase in Co3Sn2S2, but also provide insights for the
+understanding of its exotic physical properties.",2103.08113v1
+2021-05-06,Effective Landé factors for an electrostatically defined quantum point contact in silicene,"The transconductance and effective Land\'{e} $g^*$ factors for a quantum
+point contact defined in silicene by the electric field of a split gate is
+investigated. The strong spin-orbit coupling in buckled silicene reduces the
+$g^*$ factor for in-plane magnetic field from the nominal value 2 to around 1.2
+for the first- to 0.45 for the third conduction subband. However, for
+perpendicular magnetic field we observe an enhancement of $g^*$ factors for the
+first subband to 5.8 in nanoribbon with zigzag and to 2.5 with armchair edge.
+The main contribution to the Zeeman splitting comes from the intrinsic
+spin-orbit coupling defined by the Kane-Mele form of interaction.",2105.02843v2
+2021-05-08,From Majorana fermions to topological quantum computation in semiconductor/superconductor heterostructures,"We present a pedagogical review of topological superconductivity and its
+consequences in spin-orbit coupled semiconductor/superconductor
+heterostructures. We start by reviewing the historical origins of the notions
+of Dirac and Majorana fermions in particle physics and discuss how lower
+dimensional versions of these emerge in one dimensional superconductors.
+Ultimately, we focus on Majorana zero-modes, which emerge at defects in the
+Majorana equation. We then review the definition of the topological invariant,
+and how it allows the prediction of such Majorana modes from the bulk
+bandstructure of realistic superconductors, which do not have Lorentz
+invariance. Finally, we end with a discussion of protocols for how to detect
+such Majorana modes and use them for topological quantum computation.",2105.03769v1
+2021-05-18,Planar chirality and optical spin-orbit coupling for chiral Fabry-Perot cavities,"We design, in a most simple way, Fabry-Perot cavities with longitudinal
+chiral modes by sandwiching between two smooth metallic silver mirrors a layer
+of polystyrene made planar chiral by torsional shear stress. We demonstrate
+that the helicity-preserving features of our cavities stem from a spin-orbit
+coupling mechanism seeded inside the cavities by the specific chiroptical
+features of planar chirality. Planar chirality gives rise to an extrinsic
+source of three-dimensional chirality under oblique illumination that endows
+the cavities with enantiomorphic signatures measured experimentally and
+simulated with excellent agreement. The simplicity of our scheme is
+particularly promising in the context of chiral cavity QED and polaritonic
+asymmetric chemistry.",2105.08605v1
+2021-05-26,Antiferromagnetic magnons and local anisotropy: dynamical mean-field study,"We present a dynamical mean-field study of antiferromagnetic magnons in one-,
+two- and three-orbital Hubbard model of square and bcc cubic lattice at
+intermediate coupling strength. Weinvestigate the effect of anisotropy
+introduced by an external magnetic field or single-ion anisotropy.For the
+latter we tune continuously between the easy-axis and easy-plane models. We
+also analyzea model with spin-orbit coupling in cubic site-symmetry setting.
+The ordered states as well as themagnetic excitations are sensitive to even a
+small breaking ofSU(2)symmetry of the model andfollow the expectations of
+spin-wave theory as well as general symmetry considerations.",2105.12468v2
+2021-06-28,Penrose process for a charged black hole in a uniform magnetic field,"Spinning black holes create electromagnetic storms when immersed in ambient
+magnetic fields, illuminating the otherwise epically dark terrain. In an
+electromagnetic extension of the Penrose process, tremendous energy can be
+extracted, boosting the energy of radiating particles far more efficiently than
+the mechanical Penrose process. We locate the regions from which energy can be
+mined and demonstrate explicitly that they are no longer restricted to the
+ergosphere. We also show that there can be toroidal regions that trap negative
+energy particles in orbit around the black hole. We find that the effective
+charge coupling between the black hole and the super-radiant particles
+decreases as energy is extracted, much like the spin of a black hole decreases
+in the mechanical analogue. While the effective coupling decreases, the actual
+charge of the black hole increases in magnitude reaching the
+energetically-favored Wald value, at which point energy extraction is impeded.
+We demonstrate the array of orbits for products from the electromagnetic
+Penrose process.",2106.15010v3
+2021-07-04,Dynamics of kicked spin-orbit-coupled Bose-Einstein condensates,"We investigate the dynamics of kicked pseudo-spin-1/2 Bose-Einstein
+condensates (BECs) with spin-orbit coupling (SOC) in a tightly confined
+toroidal trap. The system exhibits different dynamical behaviors depending on
+the competition among SOC, kick strength, kick period and interatomic
+interaction. For weak kick strength, with the increase of SOC the density
+profiles of two components evolve from overlapped symmetric distributions into
+staggered antisymmetric distributions, and the evolution of energy experiences
+a transition from quasiperiodic motion to modulated quantum beating. For large
+kick strength, when the SOC strength increases, the overlapped symmetric
+density distributions become staggered irregular patterns, and the energy
+evolution undergoes a transition from quasiperiodic motion to dynamical
+localization. Furthermore, in the case of weak SOC, the increase of kick period
+leads to a transition of the system from quantum beating to Rabi oscillation,
+while for the case of strong SOC the system demonstrates complex quasiperiodic
+motion.",2107.01565v1
+2021-07-27,Photovoltaic transistor of atoms due to spin-orbit coupling in three optical traps,"In this paper, spin-orbit coupling induced photovoltaic effect of cold atoms
+has been studied in a three-trap system which is an two-dimensional extension
+of a two-trap system reported previously. It is proposed here that atom
+coherent length is one of the important influence to the resistance of this
+photovoltaic battery. Current properties of the system for different
+geometrical structures of the trapping potentials are discussed. Numerical
+results show extension in the number of traps could cause current increase
+directly. Quantum master equation at finite temperature is used to treat this
+opened system. This work may give a theoretical basis for further development
+of the photovoltaic effect of neutral atoms.",2107.12882v1
+2021-08-06,Fulde-Ferrel-Larkin-Ovchinnikov phase in one dimensional Fermi gas with attractive interactions and transverse spin-orbit coupling,"We examine the existence and characteristics of the exotic
+Fulde-Ferrel-Larkin-Ovchinnikov (FFLO) phase in a one-dimensional Fermi gas
+with attractive Hubbard interactions, in the presence of spin-orbit coupling
+(SOC) and Zeeman field. We show that a robust FFLO phase can be created in the
+presence of attractive on-site interactions and Zeeman field, and that the
+addition of SOC suppresses the FFLO order and enhances the pair formation. In
+absence of SOC, the system shows four phases: Bardeen-Cooper-Schrieffer (BCS),
+FFLO, multi- mode pairing and fully polarized phases by tuning the Zeeman field
+h, and the quantum transition between these phases is discontinuous with
+respect to h. In the presence of SOC, the transition from the BCS to FFLO phase
+becomes continuous. We present a complete phase diagram of this model both in
+the presence and in the absence of SOC at quarter electron filling and also
+explore the effect of SOC on the FFLO phase.",2108.03314v1
+2021-08-12,Less is more: Vacancy-engineered nodal-line semimetals,"A nodal-line semimetal phase which is enforced by the symmetries of the
+material is interesting from fundamental and application standpoints. We
+demonstrate that such a phase of matter can be engineered by a simple method:
+Introducing vacancies in certain configurations in common symmorphic materials
+leads to nonsymmorphic polymorphs with symmetry-enforced nodal lines which are
+immune to symmetry-preserving perturbations, such as spin-orbit coupling.
+Furthermore, the spectrum acquires also accidental nodal lines with enhanced
+robustness to perturbations. These phenomena are explained on the basis of a
+symmetry analysis of a minimal effective two-dimensional model which captures
+the relevant symmetries of the proposed structures, and verified by
+first-principles calculations of vacancy-engineered borophene polymorphs, both
+with vanishing and with strong Rashba spin-orbit coupling. Our findings offer
+an alternative path to using complicated nonsymmorphic compounds to design
+robust nodal-line semimetals; one can instead remove atoms from a simple
+symmorphic monoatomic material.",2108.05502v1
+2021-09-07,Phase diagram of a model for topological superconducting wires,"We calculate the phase diagram of a model for topological superconducting
+wires with local s-wave pairing, spin-orbit coupling $\vec{\lambda}$ and
+magnetic field $\vec{B}$ with arbitrary orientations. This model is a
+generalized lattice version of the one proposed by Lutchyn $\textit{et al.}$
+[Phys. Rev. Lett. $\textbf{105}$ 077001 (2010)] and Oreg $\textit{et al.}$
+[Phys. Rev. Lett. $\textbf{105}$ 177002 (2010)], who considered $\vec{\lambda}$
+perpendicular to $\vec{B}$. The model has a topological gapped phase with
+Majorana zero modes localized at the ends of the wires. We determine
+analytically the boundary of this phase. When the directions of the spin-orbit
+coupling and magnetic field are not perpendicular, in addition to the
+topological phase and the gapped non topological phase, a gapless
+superconducting phase appears.",2109.03190v2
+2021-09-08,Emergent inductance by dynamical Aharonov-Casher phases,"We propose a mechanism of inductance operation originating from a dynamical
+Aharonov-Casher (AC) phase of an electron in ferromagnets. By taking into
+account spin-orbit coupling effects, we extend the theory of emergent
+inductance, which has recently been discovered in spiral magnets, to arbitrary
+magnetic textures. The inductance of dynamical AC phase origin universally
+arises in the coexistence of magnetism and a spin-orbit coupling, even with
+spatially-uniform magnetization, allowing its stable operation in wide ranges
+of temperature and frequency. Revisiting the widely studied systems, such as
+ferromagnets with spatial inversion asymmetry, with the new perspective offered
+by our work will lead to opening a new paradigm in the study of AC phase
+physics and the spintronics-based power management in ultra-wideband frequency
+range.",2109.03558v1
+2021-10-04,Quantum-geometric perspective on spin-orbit-coupled Bose superfluids,"We employ the Bogoliubov approximation to study how the quantum geometry of
+the helicity states affects the superfluid properties of a spin-orbit-coupled
+Bose gas in continuum. In particular we derive the low-energy Bogoliubov
+spectrum for a plane-wave condensate in the lower helicity band and show that
+the geometric contributions to the sound velocity are distinguished by their
+linear dependences on the interaction strength, i.e., they are in sharp
+contrast to the conventional contribution which has a square-root dependence.
+We also discuss the roton instability of the plane-wave condensate against the
+stripe phase and determine their phase transition boundary. In addition we
+derive the superfluid density tensor by imposing a phase-twist on the
+condensate order parameter and study the relative importance of its
+contribution from the interband processes that is related to the quantum
+geometry.",2110.01385v2
+2021-11-06,Phase transition in the 5d1 double perovskite Ba2CaReO6 induced by high magnetic field,"Magnetic properties of an antiferromagnetic double perovskite oxide
+Ba2CaReO6, where Re6+ (5d1) ions with large spin-orbit coupling are arranged on
+the face-centered-cubic lattice, are investigated using pulsed high magnetic
+field up to 66 T. Magnetization and magnetostriction measurements have revealed
+a magnetic field induced phase transition at around 50 T. The phase transition
+accompanies a jump of magnetization and longitudinal magnetostriction of
+approximately 2 10^(-4) with the change of power law behavior, indicating
+sizable coupling between the electronic degrees of freedom and the lattice. The
+high field phase exhibits a magnetic moment approximately 0.2 {\mu}B, which is
+close to the values observed in 5d1 double perovskite oxides with non-collinear
+magnetic structure. We argue that Ba2CaReO6 is an antiferromagnet that sits
+close to the phase boundary between the collinear and non-collinear phases,
+providing the target material for investigating the interplay between
+spin-orbital entangled electrons and magnetic field.",2111.03807v1
+2021-12-13,Induction of Large Magnetic Anisotropy Energy and Formation of Multiple Dirac States in SrIrO$_3$ Films: Role of correlation and spin-orbit coupling,"The 5$d$ transition metal oxides, in particular iridates, host novel
+electronic and magnetic phases due to the interplay between onsite Coulomb
+repulsion ($U$) and spin-orbit coupling (SOC). The reduced dimensionality
+brings another degree of freedom to increase the functionality of these
+systems. By taking the example of ultrathin films of SrIrO$_3$,theoretically,
+we demonstrate that confinement led localization can introduce large magnetic
+anisotropy energy (MAE) in the range 2-7 meV/Ir which is one to two orders
+higher than that of the traditional MAE compounds formed out of transition
+metals and their multilayers. Furthermore, in the weak correlation limit,
+tailored terminations can yield multiple Dirac states across a large energy
+window of 2 eV around the Fermi energy which is a rare phenomena in correlated
+oxides and upon experimental realization it will give rise to unique transport
+properties with excitation and doping.",2112.06813v2
+2021-12-23,Dragging spin-orbit-coupled solitons by a moving optical lattice,"It is known that the interplay of the spin-orbit-coupling (SOC) and
+mean-field self-attraction creates stable two-dimensional (2D) solitons (ground
+states) in spinor Bose-Einstein condensates. However, SOC destroys the system's
+Galilean invariance, therefore moving solitons exist only in a narrow interval
+of velocities, outside of which the solitons suffer delocalization. We
+demonstrate that the application of a relatively weak moving optical lattice
+(OL), with the 2D or quasi-1D structure, makes it possible to greatly expand
+the velocity interval for stable motion of the solitons. The stability domain
+in the system's parameter space is identified by means of numerical methods. In
+particular, the quasi-1D OL produces a stronger stabilizing effect than its
+full 2D counterpart. Some features of the domain are explained analytically.",2112.12429v1
+2022-01-19,Supercurrent-Induced Weyl Superconductivity,"We show that Weyl superconductivity can be induced by finite supercurrent in
+noncentrosymmetric spin-orbit-coupled superconductors with line nodes. We
+introduce a three-dimensional tight-binding model of a tetragonal
+superconductor in a $D+p$-wave pairing state with a finite center-of-mass
+momentum, and elucidate that a line-nodal to point-nodal spectral transition
+occurs by applying an infinitesimal supercurrent. We also clarify that the
+higher-order effect in spin-orbit coupling is particularly important for this
+phenomenon. The point nodes are protected by topologically nontrivial Weyl
+charges, and therefore gapless arc states appear on the surface of the
+superconductor. Furthermore, both the positions and the Weyl charges of the
+point nodes depend on the direction of the current. In addition, a quantized
+Berry phase defined on high-symmetry planes characterizes the Weyl nodes when
+the in-plane supercurrent is considered. Our proposition paves a new way for
+controlling the superconducting gap structures by using an external field.",2201.07397v3
+2022-01-19,Self-ordered supersolid phase beyond Dicke superradiance in a ring cavity,"The supersolid phase characterized by the superfluid and long-range spatial
+periodicity of crystalline order is central to many branches of science ranging
+from condensed matter physics to ultracold atomic physics. Here we study a
+self-ordered checkerboard supersolid phase originating from dynamical
+spin-orbit coupling for a transversely pumped atomic Bose-Einstein condensate
+trapped in a ring cavity, corresponding to a superradiant anti-Tavis-Cummings
+phase transition. In particular, an undamped gapless Goldstone mode is observed
+in contrast to the experimentally realized lattice supersolid with a gapped
+roton mode for Dicke superradiance. This zero energy mode reveals the rigidity
+of the self-ordered superradiant phase, which spontaneously breaks a continuous
+translational symmetry. Our work will highlight the significant opportunities
+for exploring long-lived supersolid matter by utilizing dynamical spin-orbit
+coupling in controllable optical cavities.",2201.07664v2
+2022-01-21,Fine structure of the stripe phase in ring-shaped Bose-Einstein condensates with spin-orbital-angular-momentum coupling,"We report on a theoretical study of a ring-shaped Bose-Einstein condensate
+with Raman-induced spin-orbital-angular-momentum coupling. We analyze the
+structure of the ground-state of the system depending different physical
+parameters and reveal a peculiar fine structure within the stripe phase on the
+phase diagram. We demonstrate the existence of the predicted stripe sub-phases
+within a wide range of physical parameters, their traceability through physical
+observables, and compare the results with several commonly used variational
+approximations. We also show that predicted sub-phases of the stripe phase can
+be observed within experimentally realizable conditions.",2201.08728v1
+2022-01-27,Topological flat bands in a kagomé lattice multiorbital system,"Flat bands and dispersive Dirac bands are known to coexist in the electronic
+bands in a two-dimensional kagome lattice. Including the relativistic
+spin-orbit coupling, such systems often exhibit nontrivial band topology,
+allowing for gapless edge modes between flat bands at several locations in the
+band structure, and dispersive bands or at the Dirac band crossing. Here, we
+theoretically demonstrate that a multiorbital system on a kagome lattice is a
+versatile platform to explore the interplay between nontrivial band topology
+and electronic interaction. Specifically, here we report that the multiorbital
+kagome model with the atomic spin-orbit coupling naturally supports topological
+bands characterized by nonzero Chern numbers $\cal C$, including a flat band
+with $|{\cal C}| =1$. When such a flat band is $1/3$ filled, the non-local
+repulsive interactions induce a fractional Chern insulating state. We also
+discuss the possible realization of our findings in real kagome materials.",2201.11530v2
+2022-01-29,Angular topological superfluid and topological vortex in an ultracold Fermi gas,"We show that pairing in an ultracold Fermi gas under
+spin-orbital-angular-momentum coupling (SOAMC) can acquire topological
+characters encoded in the quantized angular degrees of freedom. The resulting
+topological superfluid is the angular analog of its counterpart in a
+one-dimensional Fermi gas with spin-orbit coupling, but characterized by a Zak
+phase defined in the angular-momentum space. Upon tuning the SOAMC parameters,
+a topological phase transition occurs, which is accompanied by the closing of
+the quasiparticle excitation gap. Remarkably, a topological vortex state can
+also be stabilized by deforming the Fermi surface, which is topologically
+non-trivial in both the coordinate and angular-momentum space, offering
+interesting potentials for applications in quantum information and quantum
+control. We discuss how the topological phase transition and the exotic vortex
+state can be detected experimentally.",2201.12486v2
+2022-02-14,Magnetic orderings from spin-orbit coupled electrons on kagome lattice,"We investigate magnetic orderings on kagome lattice numerically from the
+tight-binding Hamiltonian of electrons, governed by the filling factor and
+spin-orbit coupling (SOC) of electrons. We find that even a simple kagome
+lattice model can host both ferromagnetic and noncollinear antiferromagnetic
+orderings depending on the electron filling, reflecting gap structures in the
+Dirac and flat bands characteristic to the kagome lattice. Kane--Mele- or
+Rashba-type SOC tends to stabilize noncollinear orderings, such as magnetic
+spirals and 120-degree antiferromagnetic orderings, due to the effective
+Dzyaloshinskii--Moriya interaction from SOC. The obtained phase structure helps
+qualitative understanding of magnetic orderings in various kagome-layered
+materials with Weyl or Dirac electrons.",2202.06665v1
+2022-02-23,Chiral Superconductivity in UTe$_2$ via Emergent $C_4$ Symmetry and Spin Orbit Coupling,"A lot of attention has been drawn to superconductivity in UTe$_2$, with
+suggestions of time-reversal symmetry breaking triplet chiral superconducting
+order parameter. The chirality of the order parameter has been attributed to an
+accidental near degeneracy of two superconducting components belonging to 1D
+irreps $B_{2u}$ and $B_{3u}$ of the relevant $D_{2h}$ point group, and it has
+been argued that the chiral $B_{2u}+iB_{3u}$ combination is selected by
+ferromagnetic fluctuations. In this work we present a possible explanation of
+the near-degeneracy as a result of an accidental $C_4$ symmetry of the band
+structure, with the superconducting order parameter belonging the 2D $E_u$
+irrep of $D_{4h}$ that uniquely descends to the sought after $B_{2u}+iB_{3u}$
+combination. We show that the $C_4$ symmetry is emergent at the level of the
+interactions using a renormalization group calculation and argue that the
+chiral combination of the order parameter is favored when spin-orbit coupling
+is added to the model.",2202.11732v1
+2022-02-28,Topological band structure via twisted photons in a degenerate cavity,"Synthetic dimensions based on particles' internal degrees of freedom, such as
+frequency, spatial modes and arrival time, have attracted significant
+attention. They offer ideal large-scale lattices to simulate nontrivial
+topological phenomena. Exploring more synthetic dimensions is one of the paths
+toward higher dimensional physics. In this work, we design and experimentally
+control the coupling among synthetic dimensions consisting of the intrinsic
+photonic orbital angular momentum and spin angular momentum degrees of freedom
+in a degenerate optical resonant cavity, which generates a periodically driven
+spin-orbital coupling system. We directly characterize the system's properties,
+including the density of states, energy band structures and topological
+windings, through the transmission intensity measurements. Our work
+demonstrates a novel mechanism for exploring the spatial modes of twisted
+photons as the synthetic dimension, which paves the way to design rich
+topological physics in a highly compact platform.",2202.13516v1
+2022-03-12,Crystal-field effects competing with spin-orbit interactions in NaCeO$_2$,"Ce compounds feature a remarkable diversity of electronic properties, which
+motivated extensive investigations over the last decades. Inelastic neutron
+scattering represents an important tool for understanding their underlying
+electronic structures but in certain cases a straightforward interpretation of
+the measured spectra is hampered by the presence of strong vibronic couplings.
+The latter may give rise to extra spectral features, which complicates the
+mapping of experimental data onto standard multiplet diagrams. To benchmark the
+performance of embedded-cluster quantum chemical computational schemes for the
+case of $4f$ systems, we here address the Ce 4$f^1$ multiplet structure of
+NaCeO$_2$, an antiferromagnet with $D_{2d}$ magnetic-site symmetry for which
+neutron scattering measurements indicate only weak vibronic effects. Very good
+agreement with the experimental results is found in the computations, which
+validates our computational approach and confirms NaCeO$_2$ as a 4$f$ magnet in
+the intermediate coupling regime with equally strong 4$f$-shell spin-orbit and
+crystal-field interactions.",2203.06394v2
+2022-03-25,Intrinsic emergence of Majorana modes in Luttinger j=3/2 systems,"We analyze theoretically two different setups for s-wave superconductivity
+(SC) proximitized $j=3/2$ particles in Luttinger materials that are able to
+host Majorana bound states (MBSs). First, we consider a one-dimensional SC wire
+with intrinsic bulk inversion asymmetry (BIA). In contrast to wires, modeled by
+a quadratic dispersion with Rashba spin-orbit coupling, there are two
+topological phase transitions in our systems at finite magnetic fields. Second,
+we analyze a two-dimensional Josephson junction on the Luttinger model finding
+a topological region even in the absence of BIA and Rashba spin-orbit
+couplings. This originates from the hybridization of the light and heavy hole
+bands of the $j=3/2$ states in combination with the SC pairing. As a
+consequence, both systems can be driven into a topological phase hosting MBSs.
+Hence, we predict that MBSs form in any SC proximitized Josephson junction on
+2D Luttinger materials by the application of magnetic field alone. This opens a
+new avenue for the search of topological SC.",2203.13646v2
+2022-04-04,Hubbard model on the kagome lattice with time-reversal invariant flux and spin-orbit coupling,"We study the Hubbard model with time-reversal invariant flux and spin-orbit
+coupling and position-dependent onsite energies on the kagome lattice, using
+numerical and analytical methods. In particular, we perform calculations using
+real space dynamical mean-field theory (R-DMFT). To study the topological
+properties of the system, we use the topological Hamiltonian approach. We
+obtain a rich phase diagram: for weak and intermediate interactions, depending
+on the model parameters, the system is in the band insulator, topological
+insulator, or metallic phase, while for strong interactions the system is in
+the Mott insulator phase. We also investigate the magnetic phases that occur in
+this system. For this purpose, in addition to R-DMFT, we also use two
+analytical methods: perturbation theory for large interactions and onsite
+energies, and stochastic mean-field theory.",2204.01350v2
+2022-04-07,Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene,"Twisted double bilayer graphene (tDBG) comprises two Bernal-stacked bilayer
+graphene sheets with a twist between them. Gate voltages applied to top and
+back gates of a tDBG device tune both the flatness and topology of the
+electronic bands, enabling an unusual level of experimental control. Broken
+spin/valley symmetry metallic states have been observed in tDBG devices with
+twist angles $\sim $ 1.2-1.3$^\circ$, but the topologies and order parameters
+of these states have remained unclear. We report the observation of an
+anomalous Hall effect in the correlated metal state of tDBG, with hysteresis
+loops spanning 100s of mT in out-of-plane magnetic field ($B_{\perp}$) that
+demonstrate spontaneously broken time-reversal symmetry. The $B_{\perp}$
+hysteresis persists for in-plane fields up to several Tesla, suggesting valley
+(orbital) ferromagnetism. At the same time, the resistivity is strongly
+affected by even mT-scale values of in-plane magnetic field, pointing to
+spin-valley coupling or to a direct orbital coupling between in-plane field and
+the valley degree of freedom.",2204.03442v1
+2022-05-20,Effect of substrate spin-orbit coupling on the topological gap size of Shiba chains,"Realizing Majorana bound states in chains of magnetic impurities on $s$-wave
+superconducting substrates relies on a fine tuning of the energy and
+hybridization of the single magnetic impurity bound states and of the
+spin-orbit coupling (SOC). While recent experiments investigate the influence
+of the former two parameters, the effect of SOC remained experimentally largely
+unexplored. Here, we present a scanning tunneling spectroscopy study of
+close-packed Mn chains along the [001]-direction on Ta(110) which has almost
+identical atomic and surface electronic structure compared to the previously
+studied Nb(110) system, but a three times larger SOC. The dominant Shiba band
+has a very similar dispersion, but its minigap, taken relative to $\varDelta$,
+is increased by a factor of 1.9 with respect to the Nb case, which can be
+ascribed to the stronger SOC.",2205.10062v2
+2022-05-23,Conductance matrix symmetries of multiterminal semiconductor-superconductor devices,"Nonlocal tunneling spectroscopy of multiterminal semiconductor-superconductor
+hybrid devices is a powerful tool to investigate the Andreev bound states below
+the parent superconducting gap. We examine how to exploit both microscopic and
+geometrical symmetries of the system to extract information on the normal and
+Andreev transmission probabilities from the multiterminal electric or
+thermoelectric differential conductance matrix under the assumption of an
+electrostatic potential landscape independent of the bias voltages, as well as
+the absence of leakage currents. These assumptions lead to several symmetry
+relations on the conductance matrix. Next, by considering a numerical model of
+a proximitized semiconductor wire with spin-orbit coupling and two normal
+contacts at its ends, we show how such symmetries can be used to identify the
+direction and relative strength of Rashba versus Dresselhaus spin-orbit
+coupling. Finally, we study how a voltage-bias-dependent electrostatic
+potential as well as quasiparticle leakage break the derived symmetry relations
+and investigate characteristic signatures of these two contributions.",2205.11193v3
+2022-06-07,Localization of ultracold atoms in incommensurate spin-orbit-coupling and Zeeman lattices,"We consider a particle governed by a one-dimensional Hamiltonian in which
+artificial periodic spin-orbit coupling and Zeeman lattice have incommensurate
+periods. Using best rational approximations to such quasiperiodic Hamiltonian,
+the problem is reduced to description of spinor states in a superlattice. In
+the absence of a constant Zeeman splitting, the system acquires an additional
+symmetry, which hinders the localization. However, if the lattices are deep
+enough, then localized states can appear even for Zeeman field with zero or
+small mean value. Spatial distribution of localized modes is nearly uniform and
+is directly related to the topological properties of the effective
+superlattice: center-of-mass coordinates of modes are determined by Zak phases
+computed from the superlattice band structure. The best rational approximations
+feature the `memory' effect: each rational approximation holds the information
+about the energies and spatial distribution of the modes obtained under
+preceding, less accurate approximations. Dispersion of low-energy initial
+wavepackets is characterized by the law $\propto t^\beta$ with $\beta$ varying
+between $1/2$ at the initial stage and $1$ at longer, but still finite-time,
+evolution. The dynamics of initial wavepackets, exciting mainly localized
+modes, manifests quantum revivals.",2206.03412v1
+2022-06-15,Polarization dependent photoemission as a probe of the magnetic ground state in the layered ferromagnet VI3,"Layered ferromagnets are thrilling materials from both a fundamental and
+technological point of view. VI3 is an interesting example, with a complex
+magnetism that differentiates it from the first reported Cr based layered
+ferromagnets. Here, we show in an indirect way through Angle Resolved
+Photoemission Spectroscopy (ARPES) experiments, the importance of spin-orbit
+coupling setting the electronic properties of this material. Our light
+polarized photoemission measurements point to a ground state with a half-filled
+e'_+- doublet, where a gap opening is triggered by spin-orbit coupling enhanced
+by electronic correlations.",2206.07233v1
+2022-07-01,Superexchange and spin-orbit coupling in monolayer and bilayer chromium trihalides,"We build a microscopic model to study the intra- and inter-layer
+superexchange due to electrons hopping in chromium trihalides
+($\mathrm{CrX}_3$, X= Cl, Br, and I). In evaluating the superexchange, we
+identify the relevant intermediate excitations in the hopping. In our study, we
+find that the intermediate hole-pairs excitations in the $p$-orbitals on X ion
+play a crucial role in mediating various types of exchange interactions. In
+particular, the inter-layer antiferromagnetic exchange may be realized by the
+hole-pair-mediated superexchange. Interestingly, we also find that these
+virtual hopping processes compete with each other leading to weak intra-layer
+ferromagnetic exchange. In addition, we also study the spin-orbit coupling
+effects on the superexchange and investigate the Dzyaloshinskii-Moriya
+interaction. Finally, we extract the microscopic model parameters from density
+functional theory for analyzing the exchange interactions in a monolayer
+$\mathrm{CrI}_3$.",2207.00365v2
+2022-07-04,Recipe for higher-order topology on the triangular lattice,"We present a recipe for an electronic 2D higher order topological insulator
+(HOTI) on the triangular lattice that can be realized in a large family of
+materials. The essential ingredient is mirror symmetry breaking, which allows
+for a finite quadrupole moment and trivial $\mathbb{Z}_2$ index. The
+competition between spin-orbit coupling and the symmetry breaking terms gives
+rise to four topologically distinct phases; the HOTI phase appears when
+symmetry breaking dominates, including in the absence of spin-orbit coupling.
+We identify triangular monolayer adsorbate systems on the (111) surface of
+zincblende/diamond type substrates as ideal material platforms and predict the
+HOTI phase for $X=$(Al,B,Ga) on SiC.",2207.01359v1
+2022-07-06,A comparison between the one- and two-step spin-orbit coupling approaches based on the ab initio Density Matrix Renormalization Group,"The efficient and reliable treatment of both spin-orbit coupling (SOC) and
+electron correlation is essential for understanding f-element chemistry. We
+analyze two approaches to the problem, the one-step approach where both effects
+are treated simultaneously, and the two-step state interaction approach. We
+report an implementation of the ab initio density matrix renormalization group
+(DMRG) with a one-step treatment of the SOC effect which can be compared to
+prior two-step treatments on an equal footing. Using a dysprosium octahedral
+complex and bridged dimer as benchmark systems, we identify characteristics of
+problems where the one-step approach is beneficial for obtaining the low-energy
+spectrum.",2207.02435v2
+2022-07-12,Spinless Mirror Chern Insulator from Projective Symmetry Algebra,"It was commonly believed that a mirror Chern insulator (MCI) must require
+spin-orbital coupling, since time-reversal symmetry for spinless systems
+contradicts with the mirror Chern number. So MCI cannot be realized in spinless
+systems which include the large field of topological artificial crystals. Here,
+we disprove this common belief. The first point to clarify is that the
+fundamental constraint is not from spin-orbital coupling but the symmetry
+algebra of time reversal and mirror operations. Then, our theory is based on
+the conceptual transformation that the symmetry algebras will be projectively
+modified under gauge fields. Particularly, we show that the symmetry algebra of
+mirror reflection and time-reversal required for MCI can be achieved
+projectively in spinless systems with lattice $\mathbb{Z}_2$ gauge fields,
+i.e., by allowing real hopping amplitudes to take $\pm$ signs. Moreover, we
+propose the basic structure, the twisted $\pi$-flux blocks, to fulfill the
+projective symmetry algebra, and develop a general approach to construct
+spinless MCIs based on these building blocks. Two concrete spinless MCI models
+are presented, which can be readily realized in artificial systems such as
+acoustic crystals.",2207.05654v1
+2022-08-09,Single crystal synthesis and low-lying electronic structure of V$_3$S$_4$,"We report successful growth of millimeter-sized high quality single crystals
+of V$_3$S$_4$, a candidate topological semimetal belonging to a low-symmetry
+space group and consisting of only low atomic number elements. Using density
+functional theory calculations and angle-resolved photoemission spectroscopy,
+we show that the nonmagnetic phase of monoclinic V$_3$S$_4$ hosts type-II
+Dirac-like quasiparticles which opens a sizable gap due to spin orbit coupling,
+as well as theoretical multiple nodal lines that are eliminated also by spin
+orbit coupling. These results suggest that relativistic effects give rise to
+profound modifications of the topological properties even in compounds with
+low-weight elements.",2208.04586v2
+2022-08-22,Electronic structure and physical properties of EuAuAs single crystal,"High-quality single crystals of EuAuAs were studied by means of powder x-ray
+diffraction, magnetization, magnetic susceptibility, heat capacity, electrical
+resistivity and magnetoresistance measurements. The compound crystallizes with
+a hexagonal structure of the ZrSiBe type (space group $P6_3/mmc$). It orders
+antiferromagnetically below 6 K due to the magnetic moments of divalent Eu
+ions. The electrical resistivity exhibits metallic behavior down to 40 K,
+followed by a sharp increase at low temperatures. The magnetotransport
+isotherms show a distinct metamagnetic-like transition in concert with the
+magnetization data. The antiferromagnetic ground state in \mbox{EuAuAs} was
+corroborated in the \textit{ab initio} electronic band structure calculations.
+Most remarkably, the calculations revealed the presence of nodal line without
+spin-orbit coupling and Dirac point with inclusion of spin-orbit coupling. The
+\textit{Z}$_2$ invariants under the effective time reversal and inversion
+symmetries make this system nontrivial topological material. Our findings,
+combined with experimental analysis, makes EuAuAs a plausible candidate for an
+antiferromagnetic topological nodal-line semimetal.",2208.10405v1
+2022-09-04,Theory of intermolecular exchange in coupled spin-1/2 nanographenes,"Open-shell nanographenes can be covalently bonded and still preserve their
+local moments, forming interacting spins lattices. In the case of benzenoid
+nanographenes, the Ovchinnikov-Lieb rules anticipate the spin of the ground
+state of the superstructure, and thereby the sign of the intermolecular
+exchange. Here we address the underlying microscopic mechanisms for
+intermolecular exchange in this type of system. We find that, in general, three
+different mechanisms contribute. First, Hund's ferromagnetic exchange that
+promotes ferromagnetic interactions of electrons in overlapping orbitals.
+Second, superexchange driven by intermolecular hybridization, identical to
+Anderson kinetic exchange, which is a decreasing function of the Hubbard-$U$
+energy scale, and is always antiferromagnetic. Third, a Coulomb-driven
+superexchange, that increases as a function of $U$, and involves virtual
+excitation of excited molecular orbitals that are extended over the entire
+structure. We find that Coulomb-driven superexchange can be either ferro or
+antiferromagnetic, accounting for Ovchinnikov-Lieb rules. We compute these
+exchange energies for the case of coupled $S=1/2$ phenalenyl triangulenes,
+using multi-configurational methods both with Hubbard and extended Hubbard
+models, thereby addressing the influence of long-range Coulomb interactions on
+the exchange interactions.",2209.01577v2
+2022-09-05,Honeycomb lattice iridate on the verge of Mott-collapse,"A new honeycomb lattice iridate (La,Na)IrO$_3$ ($\approx$ LaNaIr$_2$O$_6$) is
+successfully synthesized from the spin-orbit coupled Mott insulator
+Na$_2$IrO$_3$ by replacing the interlayer Na$^+$ ions with La$^{3+}$ ions.
+(La,Na)IrO$_3$ shows a finite Sommerfeld term in heat capacity and a $-\ln T$
+dependence of resistivity, indicating a realization of a metallic state driven
+by a Mott collapse. Furthermore, crystal structure analysis reveals the
+formation of Ir zig-zag chains with metal-metal bonding, increasing kinetic
+energy resulting in the Mott collapse. This observation would be due to a Mott
+collapse induced in a $J_{\mathrm{eff}} = 1/2$ spin-orbit coupling Mott
+insulator with an Ir honeycomb lattice by topochemical control of the ionic
+configuration.",2209.01861v1
+2022-11-30,"Phase diagram, band structure and density of states in two-dimensional attractive Fermi-Hubbard model with Rashba spin-orbit coupling","Based on the two-dimensional (2D) attractive Fermi-Hubbard model with Rashba
+spin-orbit coupling (SOC), the SOC strength and Zeeman field dependences of the
+phase diagram are investigated by calculating the pairing gap
+self-consistently. The results reveal that the phase transition from the BCS
+superfluid to the topological superfluid happens under proper Zeeman field
+strength and SOC strength. In particular, in contrast to the BCS superfluid
+decreasing monotonically as the SOC strength increasing, the topological
+superfluid region shows a dome with the SOC strength increasing. An optimal
+region in the phase diagram to find the topological superfluid can be found,
+which is important to realize the topological superfluid in optical lattice
+experimentally. Then we obtain the change of both band structure and density of
+states (DOS) during the topological phase transition, and explain the four
+peaks of DOS in the topological superfluid by the topology change of the
+low-energy branch of quasiparticle energy spectra. Moreover, the topological
+superfluid can be suppressed by the doping concentration.",2211.16974v1
+2022-12-05,The supercurrent diode effect and nonreciprocal paraconductivity due to the chiral structure of nanotubes,"The research interest in the supercurrent diode effect (SDE) has been
+growing. It has been found in various kinds of systems, in a large part of
+which it may be understood by combining spin-orbit coupling and Zeeman field.
+Here, we show that there exists another mechanism of generating SDE in chiral
+nanotubes that trap magnetic fluxes, without spin-orbit coupling or Zeeman
+field. We further show that the same generalized Ginzburg-Landau theory leads
+to nonreciprocal paraconductivity (NPC) near the transition temperature. The
+main features of both the SDE and the NPC are revealed by their parameter
+dependence. Our study suggests a new kind of platforms to explore nonreciprocal
+properties of superconducting materials. It also provides a theoretical link
+between the SDE and the NPC, which were often studied separately.",2212.02183v1
+2022-12-10,Tunable energy-level inversion in spin-orbit-coupled Bose-Einstein condensates,"A method to realize controllable inversion of energy levels in a
+one-dimensional spin-orbit (SO)-coupled two-component Bose-Einstein condensate
+under the action of a gradient magnetic field and harmonic-oscillator (HO)
+trapping potential is proposed. The linear version of the system is solved
+exactly. By adjusting the SO coupling strength and magnetic-field gradient, the
+energy-level inversion makes it possible to transform any excited state into
+the ground state. The full nonlinear system is solved numerically, and it is
+found that the results are consistent with the linear prediction in the case of
+the repulsive inter-component interaction. On the other hand, the
+inter-component attraction gives rise to states of superposition and edge
+types. Similar results are also reported for the system with the HO trap
+replaced by the box potential. These results suggest a possibility to realize
+any excited state and observe it in the experiment.",2212.05205v1
+2022-12-13,Tuning the parity of superconductivity in CeRh2As2 via pressure,"In the recently discovered heavy fermion superconductor CeRh2As2, a magnetic
+field induced phase transition has been observed inside the superconducting
+state, which is proposed to be a transition from an even to an odd-parity
+superconducting state. The odd-parity superconducting state and its large upper
+critical field has been explained by local inversion symmetry breaking and
+consequent Rashba spin-orbit coupling. Here we report the experimental tuning
+of the parity of superconductivity in CeRh2As2 via applied pressure.
+Superconductivity is enhanced by pressure after its initial suppression,
+forming a second dome. However, the odd-parity state only exists in the first
+dome and the second dome is dominated by the even-parity state. This parity
+switch of superconductivity under pressure is consistent with the competition
+between Rashba spin-orbit coupling and interlayer hopping in determining the
+parity of superconductivity in systems with local inversion symmetry breaking.
+Our results provide insightful guidance on how to look for new odd-parity
+superconductors.",2212.06930v1
+2022-12-20,Bessel Vortices in Spin-Orbit Coupled Spin-1 Bose-Einstein Condensates,"We investigate the stationary vortex solutions in two-dimensional (2D) Rashba
+spin-orbit (SO) coupled spin-1 Bose-Einstein condensate (BEC). By introducing
+the generalized momentum operator, the linear version of the system can be
+solved exactly and its solutions are a set of the Bessel vortices. Based on the
+linear version solutions, the stationary vortex solutions of the full nonlinear
+system are constructed and determined entirely by the variational
+approximation. The results show that the variational results are in good
+agreement with the numerical ones. By means of the variational results, the
+vortex ground state phase-transition between the stationary vortex solutions,
+stability, and the unit Bloch vector textures are discussed in detail. The
+results have the potential to be realized in experiment.",2212.10145v1
+2022-12-25,Stationary solitons in F=1 spin-orbit coupled Bose-Einstein condensates,"We consider solitary wave excitations above the ground state of $F=1$
+spin-orbit coupled Bose-Einstein condensates (SOBECs). The low energy
+properties of SOBECs in any of the three branches of the single particle
+dispersion relation can be described by suitable scalar nonlinear Schr\""odinger
+(NLS) equations which we obtain using multiple-scale expansions. This enables
+us to examine a variety of different configurations, such as dark solitary
+waves associated with higher energy branches, as well as dark and bright
+structures in the lowest branch. The lowest branch can also exhibit a
+``superstripe'' phase that supports solitary waves. In all cases, we provide
+explicit expressions for the NLS coefficients, and confirm their validity with
+full numerical simulations of the SOBEC system including a harmonic confining
+potential.",2212.12966v2
+2023-01-21,Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect,"Magnetic materials exhibiting topological Dirac fermions are attracting
+significant attention for their promising technological potential in
+spintronics. In these systems, the combined effect of the spin-orbit coupling
+and magnetic order enables the realization of novel topological phases with
+exotic transport properties, including the anomalous Hall effect and
+magneto-chiral phenomena. Herein, we report experimental signature of
+topological Dirac antiferromagnetism in TaCoTe2 via angle-resolved
+photoelectron spectroscopy (ARPES) and first-principles density functional
+theory (DFT) calculations. In particular, we find the existence of spin-orbit
+coupling-induced gaps at the Fermi level, consistent with the manifestation of
+a large intrinsic non-linear Hall conductivity. Remarkably, we find that the
+latter is extremely sensitive to the orientation of the N\'eel vector,
+suggesting TaCoTe2 a suitable candidate for the realization of non-volatile
+spintronic devices with an unprecedented level of intrinsic tunability.",2301.08927v1
+2023-01-30,Measuring Electron Correlation. The Impact of Symmetry and Orbital Transformations,"In this perspective, the various measures of electron correlation used in
+wavefunction theory, density functional theory and quantum information theory
+are briefly reviewed. We then focus on a more traditional metric based on
+dominant weights in the full configuration solution and discuss its behaviour
+with respect to the choice of the $N$-electron and the one-electron basis. The
+impact of symmetry is discussed and we emphasize that the distinction between
+determinants, configuration state functions and configurations as reference
+functions is useful because the latter incorporate spin-coupling into the
+reference and should thus reduce the complexity of the wavefunction expansion.
+The corresponding notions of single determinant, single spin-coupling and
+single configuration wavefunctions are discussed and the effect of orbital
+rotations on the multireference character is reviewed by analysing a simple
+model system. In molecular systems, the extent of correlation effects should be
+limited by finite system size and in most cases the appropriate choices of
+one-electron and $N$-electron bases should be able to incorporate these into a
+low-complexity reference function, often a single configurational one.",2301.12807v2
+2023-02-08,Superconducting diode effect in quasi-one-dimensional systems,"The recent observations of the superconducting diode effect pose the
+challenge to fully understand the necessary ingredients for non-reciprocal
+phenomena in superconductors. In this theoretical work, we focus on the
+non-reciprocity of the critical current in a quasi-one-dimensional
+superconductor. We define the critical current as the value of the supercurrent
+at which the quasiparticle excitation gap closes (depairing). Once the critical
+current is exceeded, the quasiparticles can exchange energy with the
+superconducting condensate, giving rise to dissipation. Our minimal model can
+be microscopically derived as a low-energy limit of a Rashba spin-orbit coupled
+superconductor in a Zeeman field. Within the proposed model, we explore the
+nature of the non-reciprocal effects of the critical current both analytically
+and numerically. Our results quantify how system parameters such as spin-orbit
+coupling and quantum confinement affect the strength of the superconducting
+diode effect. Our theory provides a complementary description to
+Ginzburg-Landau theories of the effect.",2302.04277v1
+2023-02-10,Cross-polarization extinction enhancement and spin-orbit coupling of light for quantum-dot cavity-QED spectroscopy,"Resonant laser spectroscopy is essential for the characterization, operation,
+and manipulation of single quantum systems such as semiconductor quantum dots.
+The separation of the weak resonance fluorescence from the excitation laser is
+key for high-quality single- and entangled photon sources. This is often
+achieved by cross-polarization laser extinction, which is limited by the
+quality of the optical elements. Recently, it was discovered that
+Fresnel-reflection birefringence in combination with single-mode filtering
+counteracting spin-orbit coupling effects enables a three-order of magnitude
+improvement of polarization extinction [PRX 11, 021007 (2021)]. Here, we first
+investigate multiple reflections and analyze beam reshaping, and observe that
+the single-reflection extinction enhancement is optimal. We then demonstrate
+this method for cross-polarization extinction enhancement for a resonantly
+excited semiconductor quantum dot in a birefringent optical micro cavity, and
+observe a 10x improvement of single-photon contrast.",2302.05359v1
+2023-02-11,Controllable quantum scars induced by spin-orbit couplings in quantum dots,"The spin-orbit couplings (SOCs) which are the relativistic corrections
+originated from the Dirac equation, offer nonlinearity in the classical limit
+and are capable of driving the chaotic dynamics. In a nanoscale quantum dot
+confined by a two dimensional parabolic potential with the SOCs, various
+quantum scar states emerge quasi-periodically in the eigenstates of the system,
+when the ratio of the confinement energies in the two directions are nearly
+commensurable. The scars, displaying both the quantum interference and the
+classical trajectory on the electron density, induced by the relativistic
+effects, indicate the bridge between the classical and quantum behaviors of the
+system. When the strengths of the Rashba and Dresselhauss SOCs are identical,
+the chaos in the classical limit is eliminated as the classical Hamilton's
+equations being linear and all the quantum scar states disappear consequently.
+The quantum scars induced by SOCs are found to be robust against small
+perturbations of the systematic parameters. As the Rashba SOC been controlled
+precisely by an external gate, the quantum scar here is fully controllable and
+detectable.",2302.05739v2
+2023-03-30,Antiferromagnetically ordered Dirac semimetal in Hubbard model with spin-orbit coupling,"We examine the possible existence of Dirac semimetal with magnetic order in a
+two-dimensional system with a nonsymmorphic symmetry by using the Hartree-Fock
+mean-field theory within the Hubbard model. We locate the region in the
+second-neighbor spin-orbit coupling vs Hubbard interaction phase diagram, where
+such a state is stabilized. The edge states for the ribbons along two
+orthogonal directions concerning the orientation of in-plane magnetic moments
+are obtained. Finally, the effect of the in-plane magnetic field, which results
+in the stabilization of the Weyl semimetallic state, and the nature of the edge
+states corresponding to the Weyl semimetallic state for ribbon geometries are
+also explored.",2303.17101v3
+2023-03-31,Superconducting topological Dirac semimetals: $P6/m$-Si$_6$ and $P6/m$-NaSi$_6$,"We theoretically propose that hexagonal silicon-based crystals, $P6/m$-Si$_6$
+and $P6/m$-NaSi$_6$, are topological Dirac semimetals with superconducting
+critical temperatures of 12 K and 13 K, respectively, at ambient pressure. Band
+inversion occurs with the Fu-Kane topological invariant $\mathbb{Z}_2=1$, even
+in the absence of spin-orbit coupling. The Dirac nodes protected by $C_6$
+crystal rotational symmetry remain gapless with spin-orbit coupling. Using
+first-principles calculations, we find pressure-induced topological phase
+transitions for $P6/m$-Si$_6$ and $P6/m$-NaSi$_6$ with critical external
+pressures of 11.5 GPa and 14.9 GPa, respectively. Above the critical pressures,
+the Dirac bands are gapped with $\mathbb{Z}_2=0$, while the superconducting
+states and the crystal symmetries are retained.Our results may shed light into
+a search for silicon-based topological materials with superconductivity.",2303.17953v1
+2023-04-27,Enhanced Critical Field of Superconductivity at an Oxide Interface,"The nature of superconductivity and its interplay with strong spin-orbit
+coupling at the KTaO3(111) interfaces remains a subject of debate. To address
+this problem, we grew epitaxial LaMnO3/KTaO3(111) heterostructures. We show
+that superconductivity is robust against the in-plane magnetic field, with the
+critical field of superconductivity reaching 25 T in optimally doped
+heterostructures. The superconducting order parameter is highly sensitive to
+carrier density. We argue that spin-orbit coupling drives the formation of
+anomalous quasiparticles with vanishing magnetic moment, providing the
+condensate significant immunity against magnetic fields beyond the Pauli
+paramagnetic limit. These results offer design opportunities for
+superconductors with extreme resilience against magnetic field.",2304.14426v1
+2023-06-08,Topological Superconducting States and Quasiparticle Transport on Kagome Lattice,"The pairing symmetry of superconducting states is a critical topic in the
+realm of topological superconductivity. However, the pairing symmetry of the
+$A\mathrm{V_3Sb_5}$ family, wherein $A=\mathrm{K,Rb,Cs}$, remains
+indeterminate. To address this issue, we formulate an effective model on the
+kagome lattice to describe topological superconducting states featuring chiral
+charge density wave. Through this model, we explore the topological phase
+diagrams and thermal Hall conductivity under various parameters, with and
+without spin-orbit coupling. Our analysis reveals that the disparities in
+thermal Hall conductivity curves between different pairing symmetries are
+safeguarded by the topology resulting from the interplay of spin-orbital
+coupling and superconducting states. Remarkably, this theoretical prediction
+can potentially enable the differentiation of various superconducting pairing
+symmetries in materials via experimental measurements of thermal Hall
+conductivity curves.",2306.05034v2
+2023-06-16,Magnetochiral anisotropy-induced nonlinear Hall effect in spin-orbit coupled Rashba conductors,"We theoretically predict the existence of a non-zero magnetochiral
+anisotropy-induced nonlinear Hall effect or a second harmonic Hall voltage
+transverse to an applied current in spin-orbit coupled Rashba conductors in the
+presence of an in-plane magnetic field B. This is distinct from the Berry
+curvature dipole (BCD)-induced nonlinear Hall effect in systems with
+non-trivial bandstructure because the former requires broken time-reversal
+symmetry while the BCD-induced effect is non-zero even in time-reversal
+symmetric systems. This result is independent of the existence of other types
+of interactions, such as hexagonal warping or cubic Dresselhaus interactions.
+We find that for E||B, the magnitude of the nonlinear Hall current flowing in a
+direction perpendicular to the applied electric field is exactly 1/3 of the
+magnitude of the non-linear rectification current responsible for
+magnetoresistance parallel to the applied electric field obtained in the E\perp
+B configuration.",2306.09993v2
+2023-07-14,Aharonov-Bohm caging in spin-orbit coupled exciton-polariton lattices,"We study the Aharonov-Bohm (AB) caging effect in rhombic exciton-polariton
+lattices, with the Rashba-Dresselhaus spin-orbit coupling (RDSOC) in acting a
+synthetic gauge field. The effective magnetic flux through each plaquette is
+controlled by the orientation of the RDSOC and geometry of the rhombic lattice.
+The results show that the interplay of lattice geometry and the RDSOC will
+dramatically influence the energy band structure, furthermore, determining the
+transportation properties of exciton-polariton condensates. Non-Hermitian
+effects, which arise from the polariton intrinsic loss mechanism, on the AB
+caging is also discussed in detail. Meanwhile, the effect of disorder on the
+dynamics of AB caging is investigated, and we find that the disorder will lead
+to the inverse Anderson localization. We propose that using the AB caging
+effect allows to trap and steer the propagation of polaritons in a given
+parameter regime. Considering the specific example of a photonic liquid crystal
+microcavity to achieve our theoretical predictions, the AB caging could be
+switched on and off by applying an external voltage.",2307.07230v1
+2023-07-20,Superconductivity Induced Ferromagnetism In The Presence of Spin-Orbit Coupling,"We investigate the behavior of magnetic impurities placed on the surface of
+superconductor thin films with spin-orbit coupling. Our study reveals
+long-range interactions between the impurities, which decay according to a
+power law, mediated by the supercurrents. Importantly, these interactions
+possess a ferromagnetic component when considering the influence of the
+electromagnetic field, leading to the parallel alignment of the magnetic
+moments in the case of two impurities. In a Bravais lattice of magnetic
+impurities, superconductivity facilitates the establishment of ferromagnetic
+order within specific parameter ranges. These findings challenge the
+conventional understanding that ferromagnetism and superconductivity are
+mutually exclusive phenomena. Our theoretical framework provides a plausible
+explanation for the recently observed remanent flux in iron-based
+superconductors, particularly Fe(Se,Te).",2307.10723v3
+2023-07-31,Spectrum and quench-induced dynamics of spin-orbit coupled quantum droplets,"We investigate the ground state and dynamics of one-dimensional spin-orbit
+coupled (SOC) quantum droplets within the extended Gross-Pitaevskii approach.
+As the SOC wavenumber increases, stripe droplet patterns emerge, with a
+flat-top background, for larger particle numbers. The surface energy decays
+following a power-law with respect to the interactions. At small SOC
+wavenumbers, a transition from Gaussian to flat-top droplets occurs for either
+a larger number of atoms or reduced intercomponent attraction. The excitation
+spectrum shows that droplets for relatively small SOC wavenumbers are stable,
+otherwise stripe droplets feature instabilities as a function of the particle
+number or the interactions. We also witness rich droplet dynamical features
+using velocity imprinting and abrupt changes in the intercomponent interaction
+or the SOC parameters. Characteristic responses include breathing oscillations,
+expansion, symmetric and asymmetric droplet fragmentation, admixtures of single
+and stripe droplet branches, and erratic spatial distributions suggesting the
+triggering of relevant instabilities. Our results reveal the controlled
+dynamical generation and stability properties of stripe droplets that should be
+detectable in current cold-atom experiments.",2307.16742v2
+2023-08-02,Over-Barrier Photoelectron Emission with Rashba Spin-Orbit Coupling,"We develop a theoretical model to calculate the quantum efficiency (QE) of
+photoelectron emission from materials with Rashba spin-orbit coupling (RSOC)
+effect. In the low temperature limit, an analytical scaling between QE and the
+RSOC strength is obtained as QE $\propto (\hbar\omega-W)^2+2E_R(\hbar \omega-W)
+-E_R^2/3$, where $\hbar\omega$, $W$ and $E_R$ are the incident photon energy,
+work function and the RSOC parameter respectively. Intriguingly, the RSOC
+effect substantially improves the QE for strong RSOC materials. For example,
+the QE of Bi$_2$Se$_3$ and Bi/Si(111) increases, by 149\% and 122\%,
+respectively due to the presence of strong RSOC. By fitting to the
+photoelectron emission characteristics, the analytical scaling law can be
+employed to extract the RSOC strength, thus offering a useful tool to
+characterize the RSOC effect in materials. Importantly, when the traditional
+Fowler-Dubridge model is used, the extracted results may substantially deviate
+from the actual values by $\sim90\%$, thus highlighting the importance of
+employing our model to analyse the photoelectron emission especially for
+materials with strong RSOC. These findings provide a theoretical foundation for
+the design of photoemitters using Rashba spintronic materials.",2308.00952v1
+2023-09-12,Kubo formula for dc conductivity: generalization to systems with spin-orbit coupling,"We revise the Kubo formula for the electric dc conductivity in the presence
+of spin-orbit coupling (SOC). We discover that each velocity operator that
+enters this formula differs from $\partial H/\partial \boldsymbol p$, where $H$
+is the Hamiltonian and $\boldsymbol p$ is the canonical momentum. Moreover, we
+find an additional contribution to the Hall dc conductivity from noncommuting
+coordinates that is missing in the conventional Kubo-Streda formula. This
+contribution originates from the ""electron-positron"" matrix elements of the
+velocity and position operators. We argue that the widely used Rashba model
+does in fact provide a finite anomalous Hall dc conductivity in the metallic
+regime (in the noncrossing approximation) if SOC-corrections to the velocity
+and position operators are properly taken into account. While we focus on the
+response of the charge current to the electric field, linear response theories
+of other SOC-related effects should be modified similarly.",2309.06416v5
+2023-10-10,Skyrmions and magnetic bubbles in spin-orbit coupled metallic magnets,"Motivated by the observation of Skyrmion-like magnetic textures in 2D
+itinerant ferromagnets Fe$_n$GeTe$_2$ ($n \geq3$), we develop a microscopic
+model combining itinerant magnetism and spin-orbit coupling on a triangular
+lattice. The ground state of the model in the absence of magnetic field
+consists of filamentary magnetic domain walls revealing a striking similarity
+with our magnetic force microscopy experiments on Fe$_3$GeTe$_2$. In the
+presence of magnetic field, these filaments were found to break into large size
+magnetic bubbles in our experiments. We identify uniaxial magnetic anisotropy
+as an important parameter in the model that interpolates between magnetic
+Skyrmions and ferromagnetic bubbles. Consequently, our work uncovers new
+topological magnetic textures that merge properties of Skyrmions and
+ferromagnetic bubbles.",2310.06521v1
+2023-10-12,Three-dimensional solitons in Rydberg-Dressed cold atomic gases with spin-orbit coupling,"We present numerical results for three-dimensional (3D) solitons with
+symmetries of the semi-vortex (SV) and mixed-mode (MM) types, which can be
+created in spinor Bose-Einstein condensates of Rydberg atoms under the action
+of the spin-orbit coupling (SOC). By means of systematic numerical
+computations, we demonstrate that the interplay of SOC and long-range
+spherically symmetric Rydberg interactions stabilize the 3D solitons, improving
+their resistance to collapse. We find how the stability range depends on the
+strengths of the SOC and Rydberg interactions and the soft-core atomic radius.",2310.07961v1
+2023-10-18,Quadratic nodal point in a two-dimensional noncollinear antiferromagnet,"Quadratic nodal point (QNP) in two dimensions has so far been reported only
+in nonmagnetic materials and in the absence of spin-orbit coupling. Here, by
+first-principles calculations and symmetry analysis, we predict stable QNP near
+Fermi level in a two-dimensional kagome metal-organic framework material,
+Cr$_3$(HAB)$_2$, which features noncollinear antiferromagnetic ordering and
+sizable spin-orbit coupling. Effective kp and lattice models are constructed to
+capture such magnetic QNPs. Besides QNP, we find Cr$_3$(HAB)$_2$ also hosts six
+magnetic linear nodal points protected by mirror as well as $C_{2z}T$ symmetry.
+Properties associated to these nodal points, such as topological edge states
+and quantized optical absorbance, are discussed.",2310.11810v1
+2023-10-24,Physics of excitons in layered BiI$_{3}$. Effects of dimensionality and crystal anisotropy,"We carry out a detailed theoretical study of the electronic and optical
+properties of bulk and monolayer bismuth triiodide (BiI$_{3}$), a layered metal
+halide, using the ab initio GW+BSE scheme with a full spinorial formulation. We
+discuss in detail the effects due to the change of dimensionality and the role
+of spin-orbit coupling. Moreover, we compute the exciton dispersion by solving
+the BSE at finite momentum, also analysing transverse (TE) and longitudinal
+(LE) excitons, and the L-T splitting at $\bf{q}\approx\Gamma$. The results
+provide a reference for future experimental measurements. In addition, the
+interplay between spin-orbit coupling and large binding energy, together with
+the role of quantum confinement, confirm that BiI$_{3}$ is an interesting
+material for opto-electronic applications and show that it is a good candidate
+for the study of exciton dynamics.",2310.16024v1
+2023-11-29,Non-reciprocal electron transport in finite-size superconductor/ferromagnet bilayers with strong spin-orbit coupling,"We show that spin-orbit coupling at the interface between a superconducting
+film of the finite lateral size and the underlying ferromagnetic insulator with
+in-plane exchange field gives rise to a series of non-reciprocal effects
+provided the superconducting pairing is enhanced near the boundaries of the
+superconductor due to, e.g., variation of the film thickness or of the
+interlayer electron transparency. Specifically, the critical temperature and
+the critical depairing current are shown to depend on the relative orientation
+between the exchange field in the ferromagnet and the superconducting film
+boundaries. The discovered anisotropy of the superconducting properties is
+promising for the design of diode-type elements in superconducting spintronics.",2311.17534v2
+2024-01-20,Emergent bright excitons with Rashba spin-orbit coupling in atomic monolayers,"Optical properties in van der Waals heterostructures based on monolayer
+transition-metal dichalcogenides (TMDs), are often dominated by excitonic
+transitions. While intrinsic spin-orbit coupling (SOC) and an isotropic band
+structure are typically studied in TMDs, in their heterostructures Rashba SOC
+and trigonal warping (TW), resulting in bands with threefold anisotropy, are
+also present. By considering a low-energy effective Hamiltonian and
+Bethe-Salpeter equation, we study the effect of Rashba SOC and TW on the band
+structure and absorption spectra. Rashba SOC is predicted to lead to emergent
+excitons, which are identified as an admixture between 1s and 2p symmetries. In
+contrast, for experimentally relevant values, TW has only a negligible effect
+on the absorption spectrum. These findings could guide experimental
+demonstrations of emergent bright excitons and further studies of the proximity
+effects in van der Waals heterostructure.",2401.11079v2
+2024-01-24,Layer-Dependent Quantum Anomalous Hall Effect in Rhombohedral Graphene,"The quantum anomalous Hall (QAH) effect, first proposed by the Haldane model,
+has become a paradigmatic example of application of band topology to condensed
+matter physics. The recent experimental discoveries of high Chern number QAH
+effect in pentalayer and tetralayer rhombohedral graphene highlights the
+intriguing interplay between strong interactions and spin-orbit coupling (SOC).
+Here we propose a minimal interacting model for spin-orbit coupled rhombohedral
+graphene and use the Hartree-Fock analysis to explore the phase diagram at
+charge neutrality. We find that with Ising SOC on one outmost graphene layer,
+the in-plane layer-antiferromagnetic order is the insulating ground state
+without displacement field. Upon increasing the gate displacement field, we
+find that the QAH state with Chern number being equal to the layer number
+emerges between layer-antiferromagentic state and layer-polarized state, which
+is consistent with experimental observations. We further study phase diagram
+for different thickness and find pentalayer is optimal for the QAH effect.
+Finally, we predict that QAH state is enlarged by engineering opposite Ising
+SOC on the opposite outmost layers of rhombohedral graphene.",2401.13413v1
+2024-01-30,A universal pairing gap measurement proposal by dynamical excitations in 2D doped attractive Fermi-Hubbard model with spin-orbit coupling,"By calculating dynamical structure factor of two-dimensional doped attractive
+Fermi-Hubbard model with Rashba spin-orbit coupling, we not only investigate
+collective modes and single-particle excitations of the system during the phase
+transition between Bardeen-Cooper-Schrieffer superfluid and topological
+superfluid, but also propose a universal method to measure pairing gap
+measurement in an optical lattice system. Our numerical results show that the
+area of the molecular excitation peak at the transferred momentum ${\bf
+q}=\left[\pi,\pi\right]$ is proportional to the square of the pairing gap in
+the system with Rashba SOC. In particular, this method is very sensitive to the
+pairing gap. This goes on verifying that this method is universal to measure
+the pairing gap in a doped optical lattice with Rashba SOC. These theoretical
+results are important for experimentally measuring the pairing gap and studying
+the topological superfluid in an optical lattice.",2401.17488v1
+2024-01-31,Topological superconductivity in a magnetic-texture coupled Josephson junction,"Topological superconductors are appealing building blocks for robust and
+reliable quantum information processing. Most platforms for engineering
+topological superconductivity rely on a combination of superconductors,
+materials with intrinsic strong spin-orbit coupling, and external magnetic
+fields, detrimental for superconductivity. We propose a setup where a
+conventional Josephson junction is linked via a magnetic-textured barrier.
+Antiferromagnetic and ferromagnetic insulators with periodically arranged
+domains are compatible with our proposal which does not require intrinsic
+spin-orbit or external magnetic fields. We find that the topological phase
+depends on the magnitude and period of the barrier magnetization. The
+superconducting phase controls the topological transition, which could be
+detected as a sharp suppression of the supercurrent across the junction.",2401.17670v1
+2024-03-04,Complete Interband Transitions for Non-Hermitian Spin-Orbit-Coupled Cold-Atom Systems,"Recently, synthetic spin-orbit coupling has been introduced into cold-atom
+systems for more flexible control of the Hamiltonian, which was further made
+time-varying through two-photon detuning to achieve dynamic control of the
+cold-atom state. While an intraband transition can be adiabatically obtained, a
+complete interband transition, rather than a superposition of different bands,
+obtained through fast sweeping is usually guaranteed by having the positions of
+the initial and final states be far away from any band gap in the quasimomentum
+space. Here, by introducing an additional non-Hermitian parameter through an
+atom-loss contrast together with two-photon detuning as two controllable
+external parameters, both intraband and complete interband transitions can be
+achieved independent of the positions of the initial and final states. In
+addition, a point-source diagram approach in the 2D external parameter space is
+developed to visualize and predict the locations of any nonadiabatic
+transitions. This control protocol can have potential applications in quantum
+state control and quantum simulations using cold-atom systems.",2403.01821v1
+2024-03-08,Multipolar magnetism in $5d^2$ vacancy-ordered halide double perovskites,"Vacancy-ordered halide double perovskites hosting 4d/5d transition metals
+have emerged as a distinct platform for investigating unconventional magnetism
+arising out of the interplay of strong atomic spin-orbit coupling (SOC) and
+Coulomb interactions. Focusing on the $d^2$ system Cs$_2$WCl$_6$, our ab initio
+electronic structure calculation reveals very narrow electronic bands,
+fulfilling the necessary condition to realize exotic orders. Using this input,
+we solve the many-body spin-orbit coupled single-site problem by exact
+diagonalization and show that the multiplet structure of Cs$_2$WCl$_6$ hosts
+ground non-Kramers doublets on W, with vanishing dipole moment and a small gap
+to an excited magnetic triplet. Our work provides the rationale for the
+observed strong deviation from the classic Kotani behaviour in Cs$_2$WCl$_6$
+for the measured temperature dependence of the magnetic moment. The non-Kramers
+doublets on W exhibit non-zero quadrupolar and octupolar moments, and our
+calculated two-site exchange supports the dominance of inter-site octupolar
+exchange over quadrupolar interactions. We predict ferro-octupolar order with a
+transition temperature $T_c \sim 5$K which may get somewhat suppressed by
+quantum fluctuations and disorder; this could be tested in future
+low-temperature experiments.",2403.05633v1
+2024-03-22,Crossover from relativistic to non-relativistic net magnetization for MnTe altermagnet candidate,"We experimentally study magnetization reversal curves for MnTe single
+crystals, which is the altermagnetic candidate. Above 85~K temperature, we
+confirm the antiferromagnetic behavior of magnetization $M$, which is known for
+$\alpha$--MnTe. Below 85~K, we observe anomalous low-field magnetization
+behavior, which is accompanied by the sophisticated $M(\alpha)$ angle
+dependence with beating pattern as the interplay between $M(\alpha)$ maxima and
+minima: in low fields, $M(\alpha)$ shows ferromagnetic-like 180$^\circ$
+periodicity, while at high magnetic fields, the periodicity is changed to the
+90$^\circ$ one. This angle dependence is the most striking result of our
+experiment, while it can not be expected for standard magnetic systems. In
+contrast, in altermagnets, symmetry allows ferromagnetic behavior only due to
+the spin-orbit coupling. Thus, we claim that our experiment shows the effect of
+weak spin-orbit coupling in MnTe, with crossover from relativistic to
+non-relativistic net magnetization, and, therefore, we experimentally confirm
+altermagnetism in MnTe.",2403.15348v1
+2024-03-25,Layer-selective spin-orbit coupling and strong correlation in bilayer graphene,"Spin-orbit coupling (SOC) and electron-electron interaction can mutually
+influence each other and give rise to a plethora of intriguing phenomena in
+condensed matter systems. In pristine bilayer graphene, which has weak SOC,
+intrinsic Lifshitz transitions and concomitant van-Hove singularities lead to
+the emergence of many-body correlated phases. Layer-selective SOC can be
+proximity induced by adding a layer of tungsten diselenide (WSe2) on its one
+side. By applying an electric displacement field, the system can be tuned
+across a spectrum wherein electronic correlation, SOC, or a combination of both
+dominates. Our investigations reveal an intricate phase diagram of
+proximity-induced SOC-selective bilayer graphene. Not only does this phase
+diagram include those correlated phases reminiscent of SOC-free doped bilayer
+graphene, but it also hosts unique SOC-induced states allowing a compelling
+measurement of valley g-factor and a seemingly impossible correlated insulator
+at charge neutrality, thereby showcasing the remarkable tunability of the
+interplay between interaction and SOC in WSe2 enriched bilayer graphene.",2403.17140v1
+2024-04-04,Light-element and purely charge-based topological materials,"We examine a class of Hamiltonians characterized by interatomic, interorbital
+even-odd parity hybridization as a model for a family of topological insulators
+without the need for spin-orbit coupling. Non-trivial properties of these
+materials are exemplified by studying the topologically-protected edge states
+of s-p hybridized alkali and alkaline earth atoms in one and two-dimensional
+lattices. In 1D the topological features are analogous to the canonical
+Su-Schrieffer-Heeger model but, remarkably, occur in the absence of
+dimerization. Alkaline earth chains, with Be standing out due to its gap size
+and near particle-hole symmetry, are of particular experimental interest since
+their Fermi energy without doping lies directly at the level of topological
+edge stats. Similar physics is demonstrated to occur in a 2D honeycomb lattice
+system of s-p bonded atoms, where dispersive edge states emerge. Lighter
+elements are predicted using this model to host topological states in contrast
+to spin-orbit coupling-induced band inversion favoring heaving atoms.",2404.03832v1
+2001-04-12,Ferromagnetism in the one-dimensional Hubbard model with orbital degeneracy: From low to high electron density,"We studied ferromagnetism in the one-dimensional Hubbard model with doubly
+degenerate atomic orbitals by means of the density-matrix renormalization-group
+method and obtained the ground-state phase diagrams. It was found that
+ferromagnetism is stable from low to high (0< n < 1.75) electron density when
+the interactions are sufficiently strong. Quasi-long-range order of triplet
+superconductivity coexists with the ferromagnetic order for a strong Hund
+coupling region, where the inter-orbital interaction U'-J is attractive. At
+quarter-filling (n=1), the insulating ferromagnetic state appears accompanying
+orbital quasi-long-range order. For low densities (n<1), ferromagnetism occurs
+owing to the ferromagnetic exchange interaction caused by virtual hoppings of
+electrons, the same as in the quarter-filled system. This comes from separation
+of the charge and spin-orbital degrees of freedom in the strong coupling limit.
+This ferromagnetism is fragile against variation of band structure. For high
+densities (n>1), the phase diagram of the ferromagnetic phase is similar to
+that obtained in infinite dimensions. In this case, the double exchange
+mechanism is operative to stabilize the ferromagnetic order and this long-range
+order is robust against variation of the band-dispersion. A partially polarized
+state appears in the density region 1.68<n<1.75 and phase separation occurs for
+n just below the half-filling (n=2).",0104223v2
+2005-05-31,Tidal coupling of a Schwarzschild black hole and circularly orbiting moon,"We describe the possibility of using LISA's gravitational-wave observations
+to study, with high precision, the response of a massive central body to the
+tidal gravitational pull of an orbiting, compact, small-mass object. Motivated
+by this application, we use first-order perturbation theory to study tidal
+coupling for an idealized case: a massive Schwarzschild black hole, tidally
+perturbed by a much less massive moon in a distant, circular orbit. We
+investigate the details of how the tidal deformation of the hole gives rise to
+an induced quadrupole moment in the hole's external gravitational field at
+large radii. In the limit that the moon is static, we find, in Schwarzschild
+coordinates and Regge-Wheeler gauge, the surprising result that there is no
+induced quadrupole moment. We show that this conclusion is gauge dependent and
+that the static, induced quadrupole moment for a black hole is inherently
+ambiguous. For the orbiting moon and the central Schwarzschild hole, we find
+(in agreement with a recent result of Poisson) a time-varying induced
+quadrupole moment that is proportional to the time derivative of the moon's
+tidal field. As a partial analog of a result derived long ago by Hartle for a
+spinning hole and a stationary distant companion, we show that the orbiting
+moon's tidal field induces a tidal bulge on the hole's horizon, and that the
+rate of change of the horizon shape leads the perturbing tidal field at the
+horizon by a small angle.",0505156v3
+2021-09-27,Octupolar order and Ising quantum criticality tuned by strain and dimensionality: Application to $d$-orbital Mott insulators,"Recent experiments have discovered multipolar orders in a variety of
+$d$-orbital Mott insulators. Motivated by uncovering the exchange interactions
+which underlie octupolar order proposed in the osmate double perovskites, we
+study a two-site model using exact diagonalization on a five-orbital
+Hamiltonian, incorporating spin-orbit coupling (SOC) and interactions, and
+including both intra-orbital and inter-orbital hopping. Using an exact
+Schrieffer-Wolff transformation, we then extract an effective pseudospin
+Hamiltonian for the non-Kramers doublets, uncovering dominant ferrooctupolar
+coupling driven by the interplay of two distinct intra-orbital hopping terms.
+Using classical Monte Carlo simulations on the face-centered cubic lattice, we
+obtain a ferrooctupolar transition temperature which is in good agreement with
+experiments on the osmate double perovskites. We also explore the impact of
+uniaxial strain and dimensional tuning via ultrathin films, which are shown to
+induce a transverse field on the Ising octupolar order. This suppresses $T_c$
+and potentially allows one to access octupolar Ising quantum critical points.
+We discuss possible implications of our results for a broader class of
+materials which may host such non-Kramers doublet ions.",2109.13266v3
+2022-09-21,Dynamics of photo-induced ferromagnetism in oxides with orbital degeneracy,"By using intense coherent electromagnetic radiation, it may be possible to
+manipulate the properties of quantum materials very quickly, or even induce new
+and potentially useful phases that are absent in equilibrium. For instance,
+ultrafast control of magnetic dynamics is crucial for a number of proposed
+spintronic devices and can also shed light on the possible dynamics of
+correlated phases out of equilibrium. Inspired by recent experiments on
+spin-orbital ferromagnet YTiO$_3$ we consider the nonequilibrium dynamics of
+Heisenberg ferromagnetic insulator with low-lying orbital excitations. We model
+the dynamics of the magnon excitations in this system following an optical
+pulse which resonantly excites infrared-active phonon modes. As the phonons
+ring down they can dynamically couple the orbitals with the low-lying magnons,
+leading to a dramatically modified effective bath for the magnons. We show this
+transient coupling can lead to a dynamical acceleration of the magnetization
+dynamics, which is otherwise bottlenecked by small anisotropy. Exploring the
+parameter space more we find that the magnon dynamics can also even completely
+reverse, leading to a negative relaxation rate when the pump is blue-detuned
+with respect to the orbital bath resonance. We therefore show that by using
+specially targeted optical pulses, one can exert a much greater degree of
+control over the magnetization dynamics, allowing one to optically steer
+magnetic order in this system. We conclude by discussing interesting parallels
+between the magnetization dynamics we find here and recent experiments on
+photo-induced superconductivity, where it is similarly observed that depending
+on the initial pump frequency, an apparent metastable superconducting phase
+emerges.",2209.10567v1
+2001-10-01,Orbital variability of the PSR J2051-0827 Binary System,"We have carried out high-precision timing measurements of the binary
+millisecond pulsar PSR J2051$-$0827 with the Effelsberg 100-m radio telescope
+of the Max-Planck-Institut f\""ur Radioastronomie and with the Lovell 76-m radio
+telescope at Jodrell Bank. The 6.5-yrs radio timing measurements have revealed
+a significant secular variation of the projected semi-major axis of the pulsar
+at a rate of $\dot x\equiv d(a_{\rm 1} \sin i)/dt = (-0.23\pm 0.03)\times
+10^{-12}$, which is probably caused by the Newtonian spin-orbit coupling in
+this binary system leading to a precession of the orbital plane. The required
+misalignment of the spin and orbital angular momenta of the companion are
+evidence for an asymmetric supernova explosion. We have also confirmed that the
+orbital period is currently decreasing at a rate of $\dot P_{\rm b}=(-15.5 \pm
+0.8)\times 10^{-12}$s s$^{-1}$ and have measured second and third orbital
+period derivatives $d^2P_{\rm b}/dt^2=(+2.1 \pm 0.3)\times 10^{-20} {\rm
+s^{-1}}$ and $d^3P_{\rm b}/dt^3 =(3.6 \pm 0.6)\times 10^{-28} {\rm s^{-2}}$,
+which indicate a quasi-cyclic orbital period variation similar to those found
+in another eclipsing pulsar system, PSR B1957+20. The observed variation of the
+orbital parameters constrains the maximal value of the companion radius to
+$R_{\rm c max} \sim 0.06 R_{\odot}$ and implies that the companion is
+underfilling its Roche lobe by 50 %. The derived variation in the quadrupole
+moment of the companion is probably caused by tidal dissipation similar to the
+mechanism proposed for PSR B1957+20. We conclude that the companion is at least
+partially non-degenerate, convective and magnetically active.",0110023v2
+2005-01-05,Post-Newtonian accurate parametric solution to the dynamics of spinning compact binaries in eccentric orbits: The leading order spin-orbit interaction,"We derive Keplerian-type parametrization for the solution of post-Newtonian
+(PN) accurate conservative dynamics of spinning compact binaries moving in
+eccentric orbits. The PN accurate dynamics that we consider consists of the
+third post-Newtonian accurate conservative orbital dynamics influenced by the
+leading order spin effects, namely the leading order spin-orbit interactions.
+The orbital elements of the representation are explicitly given in terms of the
+conserved orbital energy, angular momentum and a quantity that characterizes
+the leading order spin-orbit interactions in Arnowitt, Deser, and Misner-type
+coordinates. Our parametric solution is applicable in the following two
+distinct cases: (i) the binary consists of equal mass compact objects, having
+two arbitrary spins, and (ii) the binary consists of compact objects of
+arbitrary mass, where only one of them is spinning with an arbitrary spin. As
+an application of our parametrization, we present gravitational wave
+polarizations, whose amplitudes are restricted to the leading quadrupolar
+order, suitable to describe gravitational radiation from spinning compact
+binaries moving in eccentric orbits. The present parametrization will be
+required to construct `ready to use' reference templates for gravitational
+waves from spinning compact binaries in inspiralling eccentric orbits. Our
+parametric solution for the post-Newtonian accurate conservative dynamics of
+spinning compact binaries clearly indicates, for the cases considered, the
+absence of chaos in these systems. Finally, we note that our parametrization
+provides the first step in deriving a fully second post-Newtonian accurate
+`timing formula', that may be useful for the radio observations of relativistic
+binary pulsars like J0737-3039.",0501011v1
+2021-06-26,"Electronic and magnetic properties of iridium ilmenites $A$IrO$_3$ ($A=$ Mg, Zn, and Mn)","We theoretically investigate the electronic band structures and magnetic
+properties of ilmenites with edge-sharing IrO$_6$ honeycomb layers, $A$IrO$_3$
+with $A=$ Mg, Zn, and Mn, in comparison with a collinear antiferromagnet
+MnTiO$_3$. The compounds with $A=$ Mg and Zn were recently reported in
+Y.~Haraguchi {\it et al.}, Phys. Rev. Materials {\bf 2}, 054411 (2018), while
+MnIrO$_3$ has not been synthesized yet but the honeycomb stacking structure was
+elaborated in a superlattice with MnTiO$_3$ in K.~Miura {\it et al.}, Commun.
+Mater. {\bf 1}, 55 (2020). We find that, in contrast to MnTiO$_3$, where an
+energy gap opens in the Ti $3d$ bands by antiferromagnetic ordering of the
+high-spin $S=5/2$ moments, MgIrO$_3$ and ZnIrO$_3$ have a gap in the Ir $5d$
+bands under the influence of both spin-orbit coupling and electron correlation.
+Their electronic structures are similar to those in the spin-orbit coupled Mott
+insulators with the $j_{\rm eff}=1/2$ pseudospin degree of freedom, as found in
+monoclinic $A_2$IrO$_3$ with $A=$ Na and Li which have been studied as
+candidates for the Kitaev spin liquid. Indeed, we find that the effective
+exchange interactions between the $j_{\rm eff}=1/2$ pseudospins are dominated
+by the Kitaev-type bond-dependent interaction and the symmetric off-diagonal
+interactions. On the other hand, for MnIrO$_3$, we show that the local lattice
+structure is largely deformed, and both Mn $3d$ and Ir $5d$ bands appear near
+the Fermi level in a complicated manner, which makes the electronic and
+magnetic properties qualitatively different from MgIrO$_3$ and ZnIrO$_3$. Our
+results indicate that the IrO$_6$ honeycomb network in the ilmenites $A$IrO$_3$
+with $A=$ Mg and Zn would offer a good platform for exotic magnetism by the
+spin-orbital entangled moments like the Kitaev spin liquid.",2106.14105v1
+2008-11-17,"Dirac fermion quantization on graphene edges: Isospin-orbit coupling, zero modes and spontaneous valley polarization","The paper addresses boundary electronic properties of graphene with a complex
+edge structure of the armchair/zigzag/armchair type. It is shown that the
+finite zigzag region supports edge bound states with discrete equidistant
+spectrum obtained from the Green's function of the continuum Dirac equation.
+The energy levels exhibit the coupling between the valley degree of freedom and
+the orbital quantum number, analogous to a spin-orbit interaction. The
+characteristic feature of the spectrum is the presence of a zero mode, the
+bound state of vanishing energy. It resides only in one of the graphene
+valleys, breaking spontaneously Kramers' symmetry of the edge states. This
+implies the spontaneous valley polarization characterized by the valley isospin
+$\pm 1/2$. The polarization is manifested by a zero-magnetic field anomaly in
+the local tunneling density of states, and is directly related to the local
+electric Hall conductivity.",0811.2698v2
+2009-05-18,Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors,"The puzzling nature of magnetic and lattice phase transitions of iron
+pnictides is investigated via a first-principles Wannier function analysis of
+representative parent compound LaOFeAs. A rare ferro-orbital ordering is found
+to give rise to the recently observed highly anisotropic magnetic coupling, and
+drive the phase transitions--without resorting to widely employed frustration
+or nesting picture. The revealed necessity of the additional orbital physics
+leads to a correlated electronic structure fundamentally distinct from that of
+the cuprates. In particular, the strong coupling to the magnons advocates
+active roles of light orbitons in spin dynamics and electron pairing in iron
+pnictides.",0905.2957v2
+2010-02-01,Orbital magnetoelectric coupling in band insulators,"Magnetoelectric responses are a fundamental characteristic of materials that
+break time-reversal and inversion symmetries (notably multiferroics) and,
+remarkably, of ""topological insulators"" in which those symmetries are unbroken.
+Previous work has shown how to compute spin and lattice contributions to the
+magnetoelectric tensor. Here we solve the problem of orbital contributions by
+computing the frozen-lattice electronic polarization induced by a magnetic
+field. One part of this response (the ""Chern-Simons term"") can appear even in
+time-reversal-symmetric materials and has been previously shown to be quantized
+in topological insulators. In general materials there are additional orbital
+contributions to all parts of the magnetoelectric tensor; these vanish in
+topological insulators by symmetry and also vanish in several simplified models
+without time-reversal and inversion those magnetoelectric couplings were
+studied before. We give two derivations of the response formula, one based on a
+uniform magnetic field and one based on extrapolation of a long-wavelength
+magnetic field, and discuss some of the consequences of this formula.",1002.0290v2
+2011-08-30,Study of the magnetic state of K$_{0.8}$Fe$_{1.6}$Se$_2$ using the five-orbital Hubbard model in the Hartree-Fock approximation,"Motivated by the recent discovery of Fe-based superconductors close to an
+antiferromagnetic insulator in the experimental phase diagram, here the
+five-orbital Hubbard model (without lattice distortions) is studied using the
+real-space Hartree-Fock approximation, employing a 10x10 Fe cluster with Fe
+vacancies in a $\sqrt{5}x\sqrt{5}$ pattern. Varying the Hubbard and Hund
+couplings, and at electronic density $n$=6.0, the phase diagram contains an
+insulating state with the same spin pattern as observed experimentally,
+involving 2x2 ferromagnetic plaquettes coupled with one another
+antiferromagnetically. The presence of local ferromagnetic tendencies is in
+qualitative agreement with Lanczos results for the three-orbital model also
+reported here. The magnetic moment ~ 3$\mu_B$/Fe is in good agreement with
+experiments. Several other phases are also stabilized in the phase diagram, in
+agreement with recent calculations using phenomenological models.",1108.5807v2
+2013-01-30,Orbital-selective Mott transitions in a doped two-band Hubbard model with crystal field splitting,"We investigate the effects of crystal field splitting in a doped two-band
+Hubbard model with different bandwidths within dynamical mean-field theory
+(DMFT), using a quantum Monte Carlo impurity solver. In addition to an
+orbital-selective Mott phase (OSMP) of the narrow band, which is adiabatically
+connected with the well-studied OSMP in the half-filled case without crystal
+field splitting, we find, for sufficiently strong interaction and a suitable
+crystal field, also an OSMP of the wide band. We establish the phase diagram
+(in the absence of magnetic or orbital order) at moderate doping as a function
+of interaction strength and crystal field splitting and show that also the
+wide-band OSMP is associated with non-Fermi-liquid behavior in the case of
+Ising type Hund rule couplings. Our numerical results are supplemented by
+analytical strong-coupling studies of spin order and spectral functions at
+integer filling.",1301.7252v2
+2013-12-10,Amplification of Angular Rotations Using Weak Measurements,"We present a weak measurement protocol that permits a sensitive estimation of
+angular rotations based on the concept of weak-value amplification. The shift
+in the state of a pointer, in both angular position and the conjugate orbital
+angular momentum bases, is used to estimate angular rotations. This is done by
+an amplification of both the real and imaginary parts of the weak-value of a
+polarization operator that has been coupled to the pointer, which is a spatial
+mode, via a spin-orbit coupling. Our experiment demonstrates the first
+realization of weak-value amplification in the azimuthal degree of freedom. We
+have achieved effective amplification factors as large as 100, providing a
+sensitivity that is on par with more complicated methods that employ quantum
+states of light or extremely large values of orbital angular momentum.",1312.2981v3
+2018-05-14,Charge-transfer insulation in twisted bilayer graphene,"We studied the real space structure of states in twisted bilayer graphene at
+the `magic angle' $\theta = 1.08^\circ$. The flat bands close to charge
+neutrality are composed of a mix of `ring' and `center' orbitals around the AA
+stacking region. An effective model with localized orbitals is constructed,
+which necessarily includes more than just the four flat bands. Long-range
+Coulomb interaction causes a charge-transfer at half-filling of the flat bands
+from the `center' to the `ring' orbitals. Consequently, the Mott phase is a
+featureless spin-singlet paramagnet. We estimate the effective Heisenberg
+coupling that favors the singlet coupling to be $J = 3.3$ K, consistent with
+experimental values. The superconducting state depends on the nature of the
+dopants: hole-doping yields $p+ip$-wave whereas electron-doping yields
+$d+id$-wave pairing symmetry.",1805.05294v2
+2017-10-17,Coupling effect of topological states and Chern insulators in two-dimensional triangular lattices,"We investigate topological states of two-dimensional (2D) triangular lattices
+with multi-orbitals. Tight-binding model calculations of a 2D triangular
+lattice based on $\emph{p}_{x}$ and \emph{p}_{y} orbitals exhibit very
+interesting doubly degenerate energy points at different positions ($\Gamma$
+and K/K$^{\prime}$) in momentum space, with quadratic non-Dirac and linear
+Dirac band dispersions, respectively. Counterintuitively, the system shows a
+global topologically trivial rather than nontrivial state with consideration of
+spin-orbit coupling due to the ""destructive interference effect"" between the
+topological states at the $\Gamma$ and K/K$^{\prime}$ points. The topologically
+nontrivial state can emerge by introducing another set of triangular lattices
+to the system (bitriangular lattices) due to the breakdown of the interference
+effect. With first-principles calculations, we predict an intrinsic Chern
+insulating behavior (quantum anomalous Hall effect) in a family of 2D
+triangular lattice metal-organic framework of Co(C$_{21}$N$_{3}$H$_{15}$)
+(TPyB-Co) from this scheme. Our results provide a different path and
+theoretical guidance for the search for and design of new 2D topological
+quantum materials.",1710.06453v2
+2019-09-26,Particle motion around generic black holes coupled to non-linear electrodynamics,"We study spherically symmetric magnetically charged generic black hole
+solutions of general relativity coupled to non-linear electrodynamics (NED).
+For characteristic values of the generic spacetime parameters we give the
+position of horizons in dependence on the charge parameter, demonstrating
+separation of the black hole and no-horizon solutions, and possibility of
+existence of solutions containing three horizons. We show that null, weak and
+strong energy conditions are violated when the outer horizon is approaching the
+center. We study effective potentials for photons and massive test particles
+and location of circular photon orbits (CPO) and innermost stable circular
+orbit (ISCO). We show that the unstable photon orbit can become stable, leading
+to the possibility of photon capture which affects on silhouette of the central
+object. The position of ISCO approaches the horizon with increasing charge
+parameter q and the energy at ISCO decreases with increasing charge parameter.
+We investigate this phenomenon and summarize for a variety of the generic
+spacetime parameters the upper estimate on the spin parameter of the Kerr black
+which can be mimicked by the generic charged black hole solutions.",1909.12026v1
+2020-02-05,Multiferroic behavior confined by symmetry in EuTiO3 films,"We have elucidated the spin, lattice, charge and orbital coupling mechanism
+underlying the multiferroic character in tensile strained EuTiO3 films.
+Symmetry determined by oxygen octahedral tilting shapes the hybridization
+between the Eu 4f and Ti 3d orbitals and this inhibits predicted Ti
+displacement proper ferroelectricity. Instead, phonon softening emerges at low
+temperatures within the pseudo-cube (110) plane, orthogonal to the anticipated
+ferroelectric polarization symmetry. Additionally, the magnetic anisotropy is
+determined by orbital distortion through hybridization between the Ti 3d and
+typically isotropic Eu2+ 4f. This unique scenario demonstrates the critical
+role symmetry plays in the coupling of order parameters defining multiferroic
+behaviour.",2002.01996v1
+2020-12-02,"Strongly coupled charge, orbital and spin order in TbTe$_{3}$","We report a ground state with strongly coupled magnetic and charge density
+wave orders mediated via orbital ordering in the layered compound \tbt. In
+addition to the commensurate antiferromagnetic (AFM) and charge density wave
+(CDW) orders, new magnetic peaks are observed whose propagation vector equals
+the sum of the AFM and CDW propagation vectors, revealing an intricate and
+highly entwined relationship. This is especially interesting given that the
+magnetic and charge orders lie in different layers of the crystal structure
+where the highly localized magnetic moments of the Tb$^{3+}$ ions are netted in
+the Tb-Te stacks, while the charge order is formed by the conduction electrons
+of the adjacent Te-Te layers. Our results, based on neutron diffraction and
+resonant x-ray scattering reveal that the charge and magnetic subsystems
+mutually influence each other via the orbital ordering of Tb$^{3+}$ ions.",2012.01217v1
+2012-05-01,Topological orbital ladders,"We unveil a topological phase of interacting fermions on a two-leg ladder of
+unequal parity orbitals, derived from the experimentally realized double-well
+lattices by dimension reduction. $Z_2$ topological invariant originates simply
+from the staggered phases of $sp$-orbital quantum tunneling, requiring none of
+the previously known mechanisms such as spin-orbit coupling or artificial gauge
+field. Another unique feature is that upon crossing over to two dimensions with
+coupled ladders, the edge modes from each ladder form a parity-protected flat
+band at zero energy, opening the route to strongly correlated states controlled
+by interactions. Experimental signatures are found in density correlations and
+phase transitions to trivial band and Mott insulators.",1205.0254v2
+2022-02-14,Counter-intuitive Ferroelectric Property And Non-negligible Orbital Magnetic Moment In Cr/Cu Based Perovskite Metal-Organic Frameworks,"Metal-organic frameworks (MOFs) possess a hybrid nature, combining the
+inorganic properties from the metal ions and the organic properties from the
+molecular linkers. Stroppa, \textit{et al.}, showed that the perovskite-type
+MOF [C(NH$_2$)$_3$]M[(HCOO)$_3$] (M = Cr, Cu) exhibits the magneto-electric
+coupled multiferroicity [Angew. Chem. Int. Ed. 50, 5847 (2011) and Adv. Mater.
+25, 2284 (2013)]. Moreover, their ferroelectricity arises from the hybrid
+improper mechanism, which also explains the magneto-electric coupling. In this
+work, we further examine the electric and magnetic properties of
+[C(NH$_2$)$_3$]M[(HCOO)$_3$]. We find that the hybrid mode composed of
+non-polar modes induces purely electronic polarization even without the polar
+mode. The polar mode compensates for the purely electronic polarization. It
+leads to a counter-intuitive argument that the inversion of the polar mode
+rather enhances the polarization. We provide microscopic origin and macroscopic
+analysis for this polarization property. In addition, we find that the orbital
+magnetic moment is comparable to the spin contribution in the Cu-based MOF.
+Finally, we establish the model for the orbital magnetic moment based on the
+perturbation theory.",2202.06537v1
+2023-01-09,Resonating holes vs molecular spin-orbit coupled states in group-5 lacunar spinels,"The valence electronic structure of magnetic centers is one of the factors
+that determines the characteristics of a magnet. It may refer to orbital
+degeneracy, as for $j_\text{eff}=1/2$ Kitaev magnets, or near-degeneracy, e.g.
+involving the third and fourth shells in cuprate superconductors. Here we
+explore the inner structure of magnetic moments in group-5 lacunar spinels,
+fascinating materials featuring multisite magnetic units in the form of
+tetrahedral tetramers. Our quantum chemical analysis reveals a very colorful
+landscape, much richer than the single-electron, single-configuration
+description applied so far to all group-5 Ga$M_4X_8$ chalcogenides, and
+clarifies the basic multiorbital correlations on $M_4$ tetrahedral clusters:
+while for V strong correlations yield a wave-function that can be well
+described in terms of four V$^{4+}$V$^{3+}$V$^{3+}$V$^{3+}$ resonant valence
+structures, for Nb and Ta a picture of dressed molecular-orbital-like
+$j_\text{eff}=3/2$ entities is more appropriate. These internal degrees of
+freedom likely shape vibronic couplings, phase transitions, and
+magneto-electric properties in each of these systems.",2301.03392v3
+2023-01-13,The quark orbital angular momentum of ground state octet baryons,"Here we study the quark orbital angular momentum of the ground octet baryons
+employing an extended chiral constituent quark model, within which the baryon
+wave functions are taken to be superposition of the traditional $qqq$ and the
+$qqqq\bar{q}$ higher Fock components. Coupling between the two configurations
+is estimated using the $^3P_{0}$ quark-antiquark creation mechanism, and the
+corresponding coupling strength is determined by fitting the sea flavor
+asymmetry of the nucleon. The obtained numerical results show that the quark
+angular momentum of the nucleon, $\Sigma$, $\Lambda$ and $\Xi$ hyperons are in
+the range $0.10$-$0.30$. In addition, the quark angular momentum of all the
+hyperons are a little bit smaller than that of the nucleon. And the octet
+baryons spin fractions taken by the intrinsic quark orbital angular momentum
+could be up to $60\%$ in present model.",2301.05634v1
+2023-10-04,Photonic molecule approach to multi-orbital topology,"The concepts of topology provide a powerful tool to tailor the propagation
+and localization of light. While electromagnetic waves have only two
+polarization states, engineered degeneracies of photonic modes provide novel
+opportunities resembling orbital or spin degrees of freedom in condensed
+matter. Here, we tailor such degeneracies for the array of femtosecond laser
+written waveguides in the optical range exploiting the idea of photonic
+molecules -- clusters of strongly coupled waveguides. In our experiments, we
+observe the emergence of topological modes caused by the inter-orbital coupling
+and track multiple topological transitions in the system with the change of the
+lattice spacings and excitation wavelength. This strategy opens an avenue in
+designing novel types of photonic topological phases and states.",2310.03160v1
+2001-04-25,Photoemission spectra of LaMnO3 controlled by orbital excitations,"We investigate the spectral function of a hole moving in the orbital-ordered
+ferromagnetic planes of LaMnO$_3$, and show that it depends critically on the
+type of orbital ordering. While the hole does not couple to the spin
+excitations, it interacts strongly with the excitations of $e_g$ orbitals
+(orbitons), leading to new type of quasiparticles with a dispersion on the
+orbiton energy scale and with strongly enhanced mass and reduced weight.
+Therefore we predict a large redistribution of spectral weight with respect to
+the bands found in local density approximation (LDA) or in LDA+U.",0104496v1
+2001-12-22,Orbital Ordering in Paramagnetic LaMnO3 and KCuF3,"{\it Ab-initio} studies of the stability of orbital ordering, its coupling to
+magnetic structure and its possible origins (electron-phonon and/or
+electron-electron interactions) are reported for two perovskite systems,
+LaMnO$_3$ and KCuF$_3$. We present a new Average Spin State (ASS) calculational
+scheme that allowed us to treat a paramagnetic state. Using this scheme, we
+succesfully described the experimental magnetic/orbital phase diagram of both
+LaMnO$_3$ and KCuF$_3$ in crystal structures when the Jahn-Teller distortions
+are neglected. Hence, we conclude that the orbital ordering in both compounds
+is purely electronic in origin.",0112423v2
+2003-09-13,A New Scenario on the Metal-Insulator Transition in VO2,"The metal-insulator transition in VO2 was investigated using the three-band
+Hubbard model, in which the degeneracy of the 3d orbitals, the on-site Coulomb
+and exchange interactions, and the effects of lattice distortion were
+considered. A new scenario on the phase transition is proposed, where the
+increase in energy level separation among the t_2g orbitals caused by the
+lattice distortion triggers an abrupt change in the electronic configuration in
+doubly occupied sites from an S=1 Hund's coupling state to a spin S=0 state
+with much larger energy, and this strongly suppresses the charge fluctuation.
+Although the material is expected to be a Mott-Hubbard insulator in the
+insulating phase, the metal-to-insulator transition is not caused by an
+increase in relative strength of the Coulomb interaction against the electron
+hopping as in the usual Mott transition, but by the level splitting among the
+t_2g orbitals against the on-site exchange interaction. The metal-insulator
+transition in Ti2O3 can also be explained by the same scenario. Such a large
+change in the 3d orbital occupation at the phase transition can be detected by
+linear dichroic V 2p x-ray absorption measurements.",0309331v1
+2006-09-29,Orbital-selective Mott transitions in two-band Hubbard models,"The anisotropic two-orbital Hubbard model is investigated at low temperatures
+using high-precision quantum Monte Carlo (QMC) simulations within dynamical
+mean-field theory (DMFT). We demonstrate that two distinct orbital-selective
+Mott transitions (OSMTs) occur for a bandwidth ratio of 2 even without
+spin-flip contributions to the Hund exchange, and we quantify numerical errors
+in earlier QMC data which had obscured the second transition. The limit of
+small inter-orbital coupling is introduced via a new generalized Hamiltonian
+and studied using QMC and Potthoff's self-energy functional method, yielding
+insight into the nature of the OSMTs and the non-Fermi-liquid OSM phase and
+opening the possibility for a new quantum-critical point.",0609758v1
+2007-09-26,Metal-insulator transition in half-filling two-orbital Hubbard model on triangular lattice,"We have investigated the half-filling two-orbital Hubbard model on a
+triangular lattice by means of the dynamical mean-field theory (DMFT). The
+densities of states and optical conductivity clearly show the occurence of
+metal-insulating transition (MIT) at U$_{c}$, U$_{c}$=18.2, 16.8, 6.12 and 5.85
+for J=0, 0.01U, U/4 and U/3, respectively. The distinct continuities of double
+occupation of electrons, local square moments and local susceptibility of the
+charge, the spin and the orbital at J > 0 suggest that the MIT is the
+first-order; however at J=0, the MIT is the second-order in the half-filling
+two-orbital Hubbard model on triangular lattices. We attribute the first-order
+nature of the MIT to the low symmetry of the systems with finite Hund's
+coupling J.",0709.4108v2
+2010-11-25,First-principles investigation of the very large Perpendicular Magnetic Anisotropy at Fe|MgO Interfaces,"The perpendicular magnetic anisotropy (PMA) arising at the interface between
+ferromagnetic transition metals and metallic oxides are investigated via
+first-principles calculations. In this work very large values of PMA up to 3
+erg/cm$^2$ at Fe$|$MgO interfaces are reported in agreement with recent
+experiments. The origin of PMA is attributed to overlap between O-$p_z$ and
+transition metal $d_{z^2}$ orbitals hybridized with $d_{xz(yz)}$ orbitals with
+stronger spin-orbit coupling induced splitting around the Fermi level for
+perpendicular magnetization orientation. Furthemore, it is shown that the PMA
+value weakens in case of over- or underoxidation when oxygen $p_z$ and
+transition metal $d_{z^2}$ orbitals overlap is strongly affected by disorder,
+in agreement with experimental observations in magnetic tunnel junctions.",1011.5667v1
+2012-12-18,Magnetoelasticity in ACr2O4 spinel oxides,"Dynamical properties of the lattice structure was studied by optical
+spectroscopy in ACr2O4 chromium spinel oxide magnetic semiconductors over a
+broad temperature region of T=10-335K. The systematic change of the A-site ions
+(A=Mn, Fe, Co, Ni and Cu) showed that the occupancy of 3d orbitals on the
+A-site, has strong impact on the lattice dynamics. For compounds with orbital
+degeneracy (FeCr2O4, NiCr2O4 and CuCr2O4), clear splitting of infrared-active
+phonon modes and/or activation of silent vibrational modes have been observed
+upon the Jahn-Teller transition and at the onset of the subsequent long-range
+magnetic order. Although MnCr2O4 and CoCr2O4 show multiferroic and
+magnetoelectric character, no considerable magnetoelasticity was found in
+spinel compounds without orbital degeneracy as they closely preserve the
+high-temperature cubic spinel structure even in their magnetic ground state.
+Besides lattice vibrations, intra-atomic 3d-3d transitions of the A$^{2+}$ ions
+were also investigated to determine the crystal field and Racah parameters and
+the strength of the spin-orbit coupling.",1212.4301v1
+2013-05-14,Effect of electron-phonon interactions on orbital fluctuations in iron-based superconductors,"To investigate the possibility whether electron-phonon coupling can enhance
+orbital fluctuations in iron-based superconductors, we develop an ab initio
+method to construct the effective low-energy models including the
+phonon-related terms. With the derived effective electron-phonon interactions
+and phonon frequencies, we estimate the static part (\omega=0) of the
+phonon-mediated effective on-site intra- or inter-orbital electron-electron
+attractions as ~ -0.4 eV and exchange or pair-hopping terms as ~ -0.02 eV. We
+analyze the model with the derived interactions together with the electronic
+repulsions within the random phase approximation. We find that the enhancement
+of the orbital fluctuations due to the electron-phonon interactions is small,
+making the spin fluctuations dominant. As a result, the superconducting state
+with the sign reversal in gap functions ($s_\pm$-wave) is realized.",1305.2995v2
+2014-07-16,Density matrix approach to the orbital ordering in the spinel vanadates: A case study,"In this work we apply the density matrices approach to orbital ordering (OO)
+in order to study the OO of the spinel vanadates AV$_{2}$O$_{4}$ (A $\equiv$
+Zn, Cd and Mg), which is normally believed to be responsible for the structural
+transition from cubic to tetragonal phase observed in these compounds. The
+density matrices of vanadium atoms are obtained by using {\it state-of-the-art}
+full-potential linearized augmented plane wave method based GGA+U calculations.
+In the absence of spin-orbit coupling, the present study shows the existence of
+anti-ferro OO in the global (local octahedral) coordinate system where $d_{xz}$
+and $d_{yz}$ ($d_{xz}$+$d_{yz}$ and $d_{xz}$-$d_{yz}$) orbitals are mainly
+occupied at the neighboring V sites for all the compounds.",1407.4217v2
+2014-11-06,Towards Mott design by $δ$-doping of strongly correlated titanates,"Doping the distorted-perovskite Mott insulators LaTiO$_3$ and GdTiO$_3$ with
+a single SrO layer along the [001] direction gives rise to a rich correlated
+electronic structure. A realistic superlattice study by means of the charge
+self-consistent combination of density functional theory with dynamical
+mean-field theory reveals layer- and temperature-dependent multi-orbital
+metal-insulator transitions. An orbital-selective metallic layer at the
+interface dissolves via an orbital-polarized doped-Mott state into an
+orbital-ordered insulating regime beyond the two conducting TiO$_2$ layers. We
+find large differences in the scattering behavior within the latter. Breaking
+the spin symmetry in $\delta$-doped GdTiO$_3$ results in blocks of
+ferromagnetic itinerant and ferromagnetic Mott-insulating layers which are
+coupled antiferromagnetically.",1411.1637v3
+2015-03-13,Magnetic interactions in iron superconductors: A review,"High temperature superconductivity in iron pnictides and chalcogenides
+emerges when a magnetic phase is suppressed. The multi-orbital character and
+the strength of correlations underlie this complex phenomenology, involving
+magnetic softness and anisotropies, with Hund's coupling playing an important
+role. We review here the different theoretical approaches used to describe the
+magnetic interactions in these systems. We show that taking into account the
+orbital degree of freedom allows us to unify in a single phase diagram the main
+mechanisms proposed to explain the (\pi,0) order in iron pnictides: the
+nesting-driven, the exchange between localized spins, and the Hund induced
+magnetic state with orbital differentiation. Comparison of theoretical
+estimates and experimental results helps locate the Fe superconductors in the
+phase diagram. In addition, orbital physics is crucial to address the magnetic
+softness, the doping dependent properties, and the anisotropies.",1503.04223v2
+2015-06-14,Orbital two-channel Kondo effect in epitaxial ferromagnetic L10-MnAl films,"We report the first experimental realization of orbital two-channel Kondo
+(2CK) effect from two-level systems (TLSs) in epitaxial L10-MnAl films with
+giant perpendicular magnetic anisotropy. The resistivity exhibits a
+low-temperature (T) upturn with a clear transition from a lnT-dependence to
+T1/2-dependence and deviation from it in three distinct T regimes, which are
+independent of applied magnetic fields. The magnitudes of Kondo temperature and
+energy splitting of the TLSs are greatly enhanced in comparison to those in
+other systems exhibiting orbital 2CK, suggesting strong coupling between the
+tunneling centers with conduction electrons via resonant scattering. These
+results point to a considerable robustness of the orbital 2CK effect even in
+the presence of ferromagnetic ordering and significant spin polarization of the
+conduction electrons.",1506.04360v2
+2016-06-30,Slave Boson Theory of Orbital Differentiation with Crystal Field Effects: Application to UO$_2$,"We derive an exact operatorial reformulation of the rotational invariant
+slave boson method and we apply it to describe the orbital differentiation in
+strongly correlated electron systems starting from first principles. The
+approach enables us to treat strong electron correlations, spin-orbit coupling
+and crystal field splittings on the same footing by exploiting the gauge
+invariance of the mean-field equations. We apply our theory to the archetypical
+nuclear fuel UO$_2$, and show that the ground state of this system displays a
+pronounced orbital differention within the $5f$ manifold, with Mott localized
+$\Gamma_8$ and extended $\Gamma_7$ electrons.",1606.09614v3
+2016-09-09,A nonorthogonal state-interaction approach for matrix product state wave functions,"We present a state-interaction approach for matrix product state (MPS) wave
+functions in a nonorthogonal molecular orbital basis. Our approach allows us to
+calculate for example transition and spin-orbit coupling matrix elements
+between arbitrary electronic states provided that they share the same
+one-electron basis functions and active orbital space, respectively. The key
+element is the transformation of the MPS wave functions of different states
+from a nonorthogonal to a biorthonormal molecular orbital basis representation
+exploiting a sequence of non-unitary transformations following a proposal by
+Malmqvist (Int. J. Quantum Chem. 30, 479 (1986)). This is well-known for
+traditional wave-function parametrizations but has not yet been exploited for
+MPS wave functions.",1609.02684v1
+2017-02-16,Effect of laser induced orbital momentum on magnetization switching,"The observed magnetization switching by circularly polarized ultrafast laser
+pulses has been attributed to the inverse Faraday effect in which the induced
+non-equilibrium orbital momentum serves as an effective magnetic filed via
+spin-orbit coupling for magnetization rotation and switching. We critically
+examine this scenario by explicitly calculating the magnitude of the induced
+orbital momentum for generic itinerant band. We show that the calculated
+induced angular momentum is not large enough for reversing the magnetization in
+one laser pulse with the order of 100 femtosecond duration. Instead, we propose
+that each laser pulse is capable to expand a reverse domain a few nano-meters
+and it takes multiple pulses to complete the magnetization reversal process via
+domain wall motion.",1702.04823v3
+2020-07-16,Increasing the number of topological nodal lines in semimetals via uniaxial pressure,"The application of pressure has been demonstrated to induce intriguing phase
+transitions in topological nodal-line semimetals. In this work we analyze how
+uniaxial pressure affects the topological character of BaSn2 , a Dirac
+nodal-line semimetal in the absence of spin-orbit coupling. Using calculations
+based on the density functional theory and a model tight-binding Hamiltonian,
+we find the emergence of a second nodal line for pressures higher than 4 GPa.
+We examine the topological features of both phases demonstrating that a
+nontrivial character is present in both of them. Thus, providing evidence of a
+topological-to-topological phase transition in which the number of topological
+nodal lines increases. The orbital overlap increase between Ba dxz and dyz
+orbitals and Sn pz orbitals and the preservation of crystal symmetries are
+found to be responsible for the advent of this transition. Furthermore, we pave
+the way to experimentally test this kind of transition by obtaining a
+topological relation between the zero-energy modes that arise in each phase
+when a magnetic field is applied.",2007.08502v2
+2009-12-11,Superconductivity in a Two-Orbital Hubbard Model with Electron and Hole Fermi Pockets: Application in Iron Oxypnictide Superconductors,"We investigate the electronic states of a one-dimensional two-orbital Hubbard
+model with band splitting by the exact diagonalization method. The Luttinger
+liquid parameter $K_{\rho}$ is calculated to obtain superconducting (SC) phase
+diagram as a function of on-site interactions: the intra- and inter-orbital
+Coulomb $U$ and $U'$, the Hund coupling $J$, and the pair transfer $J'$. In
+this model, electron and hole Fermi pockets are produced when the Fermi level
+crosses both the upper and lower orbital bands. We find that the system shows
+two types of SC phases, the SC \Roman{u'-large} for $U>U'$ and the SC
+\Roman{u-large} for $U<U'$, in the wide parameter region including both weak
+and strong correlation regimes. Pairing correlation functions indicate that the
+most dominant pairing for the SC \Roman{u'-large} (SC \Roman{u-large}) is the
+intersite (on-site) intraorbital spin-singlet with (without) sign reversal of
+the order parameters between two Fermi pockets. The result of the SC
+\Roman{u'-large} is consistent with the sign-reversing s-wave pairing that has
+recently been proposed for iron oxypnictide superconductors.",0912.2173v1
+2016-05-19,SU(2)-SU(4) Kondo Crossover and Emergent Electric Polarization in a Triangular Triple Quantum Dot,"We study an orbitally degenerate Kondo effect in a triangular triple quantum
+dot (TTQD), where the three dots are connected vertically with a single
+metallic lead through electron tunneling. Both spin and orbital degrees of
+freedom play an important role in the SU(4) Kondo effect. This is demonstrated
+by an equilateral TTQD Kondo system at half-filling, by Wilson's numerical
+renormalization group method. We show how an emergent electric polarization of
+the TTQD is associated with a crossover from SU(4) to SU(2) symmetry in the
+low-temperature state. A marked sign reversal of the electric polarization is
+generated by the fine-tuning of Kondo coupling with degenerate orbitals, which
+can be utilized to reveal orbital dynamics in the SU(4) Kondo effect.",1605.05803v1
+2016-05-27,Atomic defect states in monolayers of MoS$_2$ and WS$_2$,"The influence of atomic vacancy defects at different concentrations on
+electronic properties of MoS$_2$ and WS$_2$ monolayers is studied by means of
+Slater-Koster tight-binding model with non-orthogonal $sp^3d^5$ orbitals and
+including the spin-orbit coupling. The presence of vacancy defects induces
+localized states in the bandgap of pristine MoS$_2$ and WS$_2$, which have
+potential to modify the electronic structure of the systems, depending on the
+type and concentration of the defects. It is shown that although the
+contribution of metal (Mo or W) $d$ orbitals is dominant in the formation of
+midgap states, the sulphur $p$ and $d$ orbitals have also considerable
+contribution in the localized states, when metal defects are introduced. Our
+results suggest that Mo and W defects can turn the monolayers into p-type
+semiconductors, while the sulphur defects make the system a n-type
+semiconductor, in agreement with ab initio results and experimental
+observations.",1605.08756v1
+2020-01-22,Constraining the origin of the planetary debris surrounding ZTF J0139+5245 through rotational fission of a triaxial asteroid,"White dwarfs containing orbiting planetesimals or their debris represent
+crucial benchmarks by which theoretical investigations of post-main-sequence
+planetary systems may be calibrated. The photometric transit signatures of
+likely planetary debris in the ZTF J0139+5245 white dwarf system has an orbital
+period of about 110 days. An asteroid which breaks up to produce this debris
+may spin itself to destruction through repeated close encounters with the star
+without entering its Roche radius and without influence from the white dwarf's
+luminosity. Here, we place coupled constraints on the orbital pericentre ($q$)
+and the ratio ($\beta$) of the middle to longest semiaxes of a triaxial
+asteroid which disrupts outside of this white dwarf's Roche radius ($r_{\rm
+Roche}$) soon after attaining its 110-day orbit. We find that disruption within
+tens of years is likely when $\beta \lesssim 0.6$ and $q\approx 1.0-2.0r_{\rm
+Roche}$, and when $\beta \lesssim 0.2$ out to $q\approx 2.5r_{\rm Roche}$.
+Analysing the longer-timescale disruption of triaxial asteroids around ZTF
+J0139+5245 is desirable but may require either an analytical approach relying
+on ergodic theory or novel numerical techniques.",2001.08223v1
+2020-02-23,Local polarization in oxygen-deficient LaMnO$_3$ induced by charge localization in the Jahn-Teller distorted structure,"The functional properties of transition metal perovskite oxides are known to
+result from a complex interplay of magnetism, polarization, strain, and
+stoichiometry. Here, we show that for materials with a cooperative Jahn-Teller
+distortion, such as LaMnO$_3$ (LMO), the orbital order can also couple to the
+defect chemistry and induce novel material properties. At low temperatures, LMO
+exhibits a strong Jahn-Teller distortion that splits the $e_g$ orbitals of the
+high-spin Mn$^{3+}$ ions and leads to alternating long, short, and intermediate
+Mn--O bonds. Our DFT+$U$ calculations show that, as a result of this orbital
+order, the charge localization in LMO upon oxygen vacancy formation differs
+from other manganites, like SrMnO$_3$, where the two extra electrons reduce the
+two Mn sites adjacent to the vacancy. In LMO, relaxations around the defect
+depend on which type of Mn--O bond is broken, affecting the $d$-orbital
+energies and leading to asymmetric and hence polar excess-electron localization
+with respect to the vacancy. Moreover, we show that the Mn--O bond lengths,
+orbital order and consequently the charge localization and polarity are tunable
+via strain.",2002.09921v1
+2020-04-21,Merging Compact Binaries Near a Rotating Supermassive Black Hole: Eccentricity Excitation due to Apsidal Precession Resonance,"We study the dynamics of merging compact binaries near a rotating
+supermassive black hole (SMBH) in a hierarchical triple configuration. We
+include various general relativistic effects that couple the inner orbit, the
+outer orbit and the spin of the SMBH. During the orbital decay due to
+gravitational radiation, the inner binary can encounter an ""apsidal precession
+resonance"" and experience eccentricity excitation. This resonance occurs when
+the apsidal precession rate of the inner binary matches that of the outer
+binary, with the precessions driven by both Newtonian interactions and various
+post-Newtonian effects. The eccentricity excitation requires the outer orbit to
+have a finite eccentricity, and is most effective for triples with small mutual
+inclinations, in contrast to the well-studied Lidov-Kozai effect. The resonance
+and the associated eccentricity growth may occur while the binary emits
+gravitational waves in the low-frequency band, and may be detectable by future
+space-based gravitational wave detectors.",2004.10205v3
+2017-09-06,Evolution of the magnetic and structural properties of Fe$_{1-x}$Co$_x$V$_2$O$_4$,"The magnetic and structural properties of single crystal
+Fe$_{1-x}$Co$_x$V$_2$O$_{4}$ samples have been investigated by performing
+specific heat, susceptibility, neutron diffraction, and X-ray diffraction
+measurements. As the orbital-active Fe$^{2+}$ ions with larger ionic size are
+gradually substituted by the orbital-inactive Co$^{2+}$ ions with smaller ionic
+size, the system approaches the itinerant electron limit with decreasing V-V
+distance. Then, various factors such as the Jahn-Teller distortion and the
+spin-orbital coupling of the Fe$^{2+}$ ions on the A sites and the orbital
+ordering and electronic itinerancy of the V$^{3+}$ ions on the B sites compete
+with each other to produce a complex magnetic and structural phase diagram.
+This phase diagram is compared to those of Fe$_{1-x}$Mn$_x$V$_2$O$_{4}$ and
+Mn$_{1-x}$Co$_x$V$_2$O$_{4}$ to emphasize several distinct features.",1709.01842v1
+2018-03-19,New superexchange paths due to breathing-enhanced hopping in corner-sharing cuprates,"We present ab initio calculations of the superexchange antiferromagnetic spin
+coupling $J$ for two cuprates, Sr$_2$CuO$_3$ and La$_2$CuO$_4$. Good agreement
+with experimental estimates is obtained. We find that $J$ increases
+substantially as the distance between Cu and apical O is increased. There is an
+important synergetic effect of the Coulomb interaction, expanding the Cu $3d$
+orbital when an electron hops into this orbital, and the O-Cu hopping, being
+increased by this orbital expansion (breathing). This is a new ingredient in
+superexchange models. In a model with a fixed basis, breathing effects can be
+described as a mixing of $3d$ and $4d$ orbitals or as a single $3d \to 4d$
+excitation.",1803.07026v1
+2018-03-21,Isolated highly localized bands in $\mathrm{YbI_2}$ monolayer caused by $4f$ orbitals,"The novel electronic structures can induce unique physical properties in
+two-dimensional (2D) materials. In this work, we report isolated highly
+localized bands in $\mathrm{YbI_2}$ monolayer by the first-principle
+calculations within generalized gradient approximation (GGA) plus spin-orbit
+coupling (SOC). It is found that $\mathrm{YbI_2}$ monolayer is an indirect-gap
+semiconductor using both GGA and GGA+SOC. The calculations reveal that Yb-$4f$
+orbitals constitute isolated highly localized bands below the Fermi level at
+the absence of SOC, and the bands are split into the $j = 7/2$ and $j = 5/2$
+states with SOC. The isolated highly localized bands can lead to very large
+Seebeck coefficient and very low electrical conductivity in p-type doping by
+producing very large effective mass of the carrier. It is proved that isolated
+highly localized bands have very strong stability again strain, which is very
+important for practical application. When the onsite Coulomb interaction is
+added to the Yb-$4f$ orbitals, isolated highly localized bands persist, and
+only their relative positions in the gap change. These findings open a new
+window to search for novel electronic structures in 2D materials.",1803.07982v1
+2018-08-08,Heavy quasiparticle bands in the underscreened quasiquartet Kondo lattice,"We study the quasiparticle spectrum in an underscreened Kondo-lattice (KL)
+model that involves a single spin degenerate conduction band and two
+crystalline-electric-field (CEF) split Kramers doublets coupled by both
+orbital-diagonal and non-diagonal exchange interactions. We find the three
+quasiparticle bands of the model using a constrained fermionic mean field
+approach. While two bands are similar to the one-orbital model a new genuinely
+heavy band inside the main hybridization gap appears in the quasiquartet model.
+Its dispersion is due to effective hybridization with conduction states but the
+bandwidth is controled by the size of the CEF splitting. Furthermore several
+new indirect and direct hybridztion gaps may be identified. By solving the
+selfconsistency equation we calculate the CEF- splitting and exchange
+dependence of effective Kondo low energy scale, hybridization gaps and band
+widths. We also derive the quasiparticle spectral densities and their partial
+orbital contributions. We suggest that the two-orbital KL model can exhibit
+mixed CEF/Kondo excitonic magnetism.",1808.02699v2
+2018-08-21,Majorana fermions in finite-size strips in the presence of orbital effects: what is the Majorana polarization telling us?,"We study numerically the formation of Majorana bound states in a finite-size
+quasi-one-dimensional square-lattice strip with Rashba spin-orbit coupling, in
+the presence of a proximity-induced superconducting pairing and a magnetic
+field perpendicular to the strip. We take into account both the Zeeman and
+orbital effects of the field. First, using the Majorana polarization, we
+demonstrate that such a system can host more than one pair of Majorana
+quasiparticles. We construct the corresponding topological phase diagram and we
+conclude that the topological regions are extended in the presence of orbital
+effects, however the gap protecting the topological states is reduced.",1808.07058v1
+2019-02-14,Hall coefficient signals orbital differentiation in the Hund's metal Sr$_2$RuO$_4$,"The Hall coefficient $R_H$ of Sr$_2$RuO$_4$ exhibits a non-monotonic
+temperature dependence with two sign reversals. We show that this puzzling
+behavior is the signature of two crossovers which are key to the physics of
+this material. The increase of $R_H$ and the first sign change upon cooling are
+associated with a crossover into a regime of coherent quasiparticles with
+strong orbital differentiation of the inelastic scattering rates. The eventual
+decrease and the second sign change at lower temperature is driven by the
+crossover from inelastic to impurity-dominated scattering. This qualitative
+picture is supported by quantitative calculations of $R_H(T)$ using Boltzmann
+transport theory in combination with dynamical mean-field theory, taking into
+account the effect of spin-orbit coupling. Our insights shed new light on the
+temperature dependence of the Hall coefficient in materials with strong orbital
+differentiation, as observed in Hund's metals.",1902.05503v2
+2019-05-24,Group-theoretic classification of superconducting states of Strontium Ruthenate,"The possible superconducting states of strontium ruthenate (Sr$_2$RuO$_4$)
+are organized into irreducible representations of the point group $D_{4h}$,
+with a special emphasis on nodes occurring within the superconducting gap. Our
+analysis covers the cases with and without spin-orbit coupling and takes into
+account the possibility of inter-orbital pairing within a three-band,
+tight-binding description of Sr$_2$RuO$_4$. No dynamical treatment if
+performed: we are confining ourselves to a group-theoretical analysis. The case
+of uniaxial deformations, under which the point group symmetry is reduced to
+$D_{2h}$, is also covered. It turns out that nodal lines, in particular
+equatorial nodal lines, occur in most representations. We also highlight some
+results specific to multiorbital superconductivity. Among other things, we find
+that odd inter-orbital pairing allows to combine singlet and triplet
+superconductivity whithin the same irreducible representation, that pure
+inter-orbital superconductivity leads to nodal surfaces and that the notion of
+nodes imposed by symmetry is not clearly defined.",1905.10467v1
+2020-06-25,Ferroelectricity-induced multiorbital odd-frequency superconductivity in SrTiO$_3$,"We demonstrate that SrTiO$_3$ can be a platform for observing the bulk
+odd-frequency superconducting state owing to the multiorbital/multiband nature.
+We consider a three-orbital tight-binding model for SrTiO$_3$ in the vicinity
+of a ferroelectric critical point. Assuming an intraorbital spin-singlet
+$s$-wave superconducting order parameter, it is shown that the odd-frequency
+pair correlations are generated due to the intrinsic LS coupling which leads to
+the local orbital mixing. Furthermore, we show the existence of additional
+odd-frequency pair correlations in the ferroelectric phase, which is induced by
+an odd-parity orbital hybridization term proportional to the ferroelectric
+order parameter. We also perform a group theoretical classification of the
+odd-frequency pair amplitudes based on the fermionic and space group symmetries
+of the system. The classification table enables us to predict dominant
+components of the odd-frequency pair correlations based on the symmetry of the
+normal state Hamiltonian that we take into account. Furthermore, we show that
+experimental signatures of the odd-parity orbital hybridization, which is an
+essential ingredient for the ferroelectricity-induced odd-frequency pair
+correlations, can be observed in the spectral functions and density of states.",2006.14181v1
+2021-02-05,"A Colossal Electroresistance response, accompanied by metal-insulator transition, in a mixed-valent vanadate","Colossal electroresistance (CER) in manganites, i.e., a large change in
+electrical resistance under the influence of either an applied electric field
+or an applied electric current, has often been described as complimentary to
+the colossal magnetoresistance (CMR) effect. Mixed valent vanadates with active
+t2g and empty eg orbitals, unlike manganites, have not naturally been discussed
+in this context, as double exchange based CMR is not realizable in them.
+However, presence of coupled spin and orbital degrees of freedom,
+metal-insulator transition (MIT) accompanied by orbital order-disorder
+transition, etc., anyway make the vanadates an exciting group of materials.
+Here we probe a Fe-doped hollandite lead vanadate PbFe1.75V4.25O11 (PFVO),
+which exhibits a clear MIT as a function of temperature. Most importantly, a
+giant fall in the resistivity, indicative of a CER, as well as a systematic
+shift in the MIT towards higher temperature are observed as a function of
+applied electric current. Detailed structural, magnetic, thermodynamic and
+transport studies point towards a complex interplay between orbital
+order/disorder effect, MIT and double exchange in this system.",2102.03128v1
+2021-06-11,Orbital-selective Mott phase and non-Fermi liquid in FePS$_3$,"The layered metal phosphorous trisulfide FePS$_3$ is reported to be a Mott
+insulator at ambient conditions and to undergo structural and insulator-metal
+phase transitions under pressure. However, the character of the resulting
+metallic states has not been understood clearly so far. Here, we theoretically
+study the phase transitions of FePS$_3$ using first-principles methods based on
+density functional theory and embedded dynamical mean field theory. We find
+that the Mott transition in FePS$_3$ can be orbital-selective, with $t_{2g}$
+states undergoing a correlation-induced insulator-to-metal transition while
+$e_g$ states remain gapped. We show that this orbital-selective Mott phase,
+which occurs only when non-hydrostatic pressure is used, is a bad metal (or
+non-Fermi liquid) with large fluctuating moments due to Hund's coupling.
+Further application of pressure increases the crystal-field splitting and
+converts the system to a conventional Fermi liquid with low-spin configurations
+dominant. Our results show that FePS$_3$ is a novel example of a system that
+realizes an orbital-selective Mott phase, allowing tuning between correlated
+and uncorrelated metallic properties in an accessible pressure range ($\leq$ 18
+GPa).",2106.06204v1
+2021-07-14,Description of molecular nanomagnets by the multi-orbital Hubbard model with correlated hopping,"We present a microscopic description of molecular magnets by the
+multi-orbital Hubbard model, which includes the correlated hopping term, i.e.
+the dependence of electron hopping amplitude between orbitals on the degree of
+their occupancy. In the limit of large Coulomb on-site interaction, we derived
+the spin Hamiltonian using the perturbation theory. The magnetic coupling
+constant between two ions we determined in two different ways: a)from the
+expression obtained in the perturbation calculus and b)from the analysis of
+distances between the lowest levels of the energy spectrum obtained by the
+diagonalization of the multi-orbital Hubbard model. The procedure we use can be
+applied to various nanomagnets, but the final calculations we performed for the
+molecular ring $Cr_8$. We showed that the correlated hopping can reduce the
+antiferromagnetic exchange between ions, what is essential for a proper
+description of $Cr_8$.",2107.06576v1
+2023-12-14,Nonlinear optical responses in multi-orbital topological superconductors,"We theoretically study first and second-order optical responses in a
+transition metal dichalcogenide monolayer with distinct trivial, nodal, and
+time-reversal invariant topological superconducting (TRITOPS) phases. We show
+that the second-order DC response, also known as the photogalvanic response,
+contains signatures for differentiating these phases while the first-order
+optical response does not. We find that the high-frequency photogalvanic
+response is insensitive to the phase of the system, while the low-frequency
+response exhibits features distinguishing the three phases. At zero doping,
+corresponding to an electron filling in which the Fermi level lies at nodal
+points, there are opposite sign zero-frequency divergences in the response when
+approaching the nodal phase boundaries from the trivial and the TRITOPS phases.
+In the trivial phase, both the high-frequency and low-frequency response of the
+system are negative, but in the TRITOPS phase, the low-frequency response
+becomes positive while the high-frequency response remains negative.
+Furthermore, since phase transitions are controlled by the Rashba spin-orbit
+coupling and the ratio of intra-orbital and inter-orbital paring amplitudes,
+our results not only help distinguish the phases but can also provide an
+estimate of the pairing amplitudes based on the photogalvanic response of the
+system.",2312.08638v1
+2023-09-10,Non-zero Integral Spin of Acoustic Vortices and Spin-orbit Interaction in Longitudinal Acoustics,"Spin and orbital angular momenta (AM) are of fundamental interest in wave
+physics. Acoustic wave, as a typical longitudinal wave, has been well studied
+in terms of orbital AM, but still considered unable to carry non-zero integral
+spin AM or spin-orbital interaction in homogeneous media due to its spin-0
+nature. Here we give the first self-consistent analytical calculations of spin,
+orbital and total AM of guided vortices under different boundary conditions,
+revealing that vortex field can carry non-zero integral spin AM. We also
+introduce for acoustic waves the canonical-Minkowski and kinetic-Abraham AM,
+which has aroused long-lasting debate in optics, and prove that only the former
+is conserved with the corresponding symmetries. Furthermore, we present the
+theoretical and experimental observation of the spin-orbit interaction of
+vortices in longitudinal acoustics, which is thought beyond attainable in
+longitudinal waves in the absence of spin degree of freedom. Our work provides
+a solid platform for future studies of the spin and orbital AM of guided
+acoustic waves and may open up a new dimension for acoustic vortex-based
+applications such as underwater communications and object manipulations.",2309.04989v1
+1997-07-29,Spin-Orbit-Induced Magnetic Anisotropy for Impurities in Metallic Samples II. Finite Size Dependence in the Kondo Resistivity,"The electrical resistivity including the Kondo resistivity increase at low
+temperature is calculated for thin films of dilute magnetic alloys. Assuming
+that in the non-magnetic host the spin-orbit interaction is strong like in Au
+and Cu, the magnetic impurities have a surface anisotropy calculated in part I.
+That anisotropy hinders the motion of the spin. Including that anisotropy the
+effective electron-impurity coupling is calculated by using the second order
+renormalization group equations. The amplitude of the Kondo resistivity
+contribution is reduced as the position of the impurity approaches the surface
+but the increase occurs approximately at the bulk Kondo temperature. Different
+proximity effects observed by Giordano are also explained qualitatively where
+the films of magnetic alloys are covered by pure second films with different
+mean free path. The theory explains the experimental results in those cases
+where a considerable amount of impurities is at the surface inside the
+ballistic region.",9707299v1
+1999-02-16,Phenomenology of the superconducting state in Sr2RuO4,"The symmetry of the superconducting phase of Sr2RuO4 is identified as the
+odd-parity pairing state d(k)=\hat{z}(k_x \pm i k_y) based on recent
+experiments. The experimental evidence for the so-called orbital dependent
+superconductivity leads to a single-band description of superconductivity based
+on spin fluctuation mechanism. It is shown that the state \hat{z}(k_x \pm i
+k_y) can be stabilized by the spin fluctuation feedback mechanism analogous to
+the A-phase in 3He and by spin-orbit coupling effects.",9902214v1
+1999-07-20,Local Time-Reversal Symmetry Breaking in d_(x2-y2) Superconductors,"We show that an isolated impurity in a spin singlet d_{x2-y2} superconductor
+generates a d_{xy} order parameter with locally broken time-reversal symmetry.
+The origin of this effect is a coupling between the d_{x2-y2} and the d_{xy}
+order parameter induced by spin-orbit scattering off the impurity. The
+signature of locally broken time-reversal symmetry is an induced orbital charge
+current near the impurity, which generates a localized magnetic field in the
+vicinity of the impurity. We present a microscopic theory for the impurity
+induced d_{xy} component, discuss its spatial structure as well as the pattern
+of induced current and local magnetic field near the localized impurity spin.",9907300v1
+2000-08-02,Origin of Magnetoresistance Anomalies in Antiferromagnetic YBa_{2}Cu_{3}O_{6+x},"Specific d-wave angular dependence of the in-plane magnetoresistence in
+antiferromagnetic tetragonal YBa_{2}Cu_{3}O_{6+x} (x~0.3) on orientation of the
+external magnetic field in (a,b) plane is assigned to the effective hole
+transport through low lying excited purely oxygen doublet O2pe_u state, not the
+ground b_{1g}(d_{x^2-y^2}) state. External magnetic field determines the
+orientation of the strong exchange field for the spin-triplet
+b_{1g}e_u:{}^{3}E_u state of the hole CuO_4 center and due to the spin-orbital
+coupling results in either orbital polarization of the E_u doublet giving rise
+to the spatial anisotropy of the hole transport. Experimental data allow to
+estimate parameter of the effective spin Hamiltonian.",0008035v3
+2000-08-22,Elementary excitations in one-dimensional spin-orbital models: neutral and charged solitons and their bound states,"We study, both numerically and variationally, the interplay between different
+types of elementary excitations in the model of a spin chain with anisotropic
+spin-orbit coupling, in the vicinity of the ""dimer line"" with an exactly known
+dimerized ground state. Our variational treatment is found to be in a
+qualitative agreement with the exact diagonalization results. Soliton pairs are
+shown to be the lowest excitations only in a very narrow region of the phase
+diagram near the dimer line, and the phase transitions are always governed by
+magnon-type excitations which can be viewed as soliton-antisoliton bound
+states. It is shown that when the anisotropy exceeds certain critical value, a
+new phase boundary appears. In the doped model on the dimer line, the exact
+elementary charge excitation is shown to be a hole bound to a soliton. Bound
+states of those ""charged solitons"" are studied; exact solutions for N-hole
+bound states are presented.",0008321v1
+2003-04-09,Field-induced magnetic anisotropy in La0.7Sr0.3CoO3,"Magnetic anisotropy has been measured for the ferromagnetic La0.7Sr0.3CoO3
+perovskite from an analysis of the high-field part of the magnetization vs.
+field curves, i.e., the magnetic saturation regime. These measurements give a
+magnetic anistropy one order of magnitude higher than that of reference
+manganites. Surprisingly, the values of the magnetic anisotropy calculated in
+this way do not coincide with those estimated from measurements of coercive
+fields which are one order of magnitude smaller. It is proposed that the reason
+of this anomalous behaviour is a transition of the trivalent Co ions under the
+external magnetic field from a low-spin to an intermediate-spin state. Such a
+transition converts the Co3+ ions into Jahn-Teller ions having an only
+partially quenched orbital angular momentum, which enhances the intra-atomic
+spin-orbit coupling and magnetic anisotropy.",0304211v1
+2004-06-18,A test of the spin-orbit sum rule for actinides using an ab-initio calculation,"The expectation value of the angular part of the spin-orbit-coupling (SOC)
+operator $<l\cdot s>$ and the branching ratio for the $N_{4,5}$
+X-ray-absorption spectroscopy in $\delta$-Pu, $\alpha$-U and
+face-centered-cubic (fcc) Th are calculated within the framework of the
+density-functional theory in combination with the local-spin-density
+approximation (LSDA), the generalized-gradient approximation (GGA) and the
+LDA+$U$ method. The SOC contribution is calculated in terms of the first- and
+the second- variational schemes. A strong variation in the magnitudes of the
+calculated $<l\cdot s>$ operator along the actinide series is found. The
+results show that the SOC sum rule for $\delta$-Pu and $\alpha$-U is reasonably
+valid, whereas there is a sign mismatch for the case of fcc Th. The calculated
+branching ratios for the case without SOC in the valence shell strongly deviate
+from the statistical value.",0406433v1
+2004-08-27,"Confined spin waves reveal an assembly of nanosize domains in ferromagnetic La(1-x)CaxMnO3 (x=0.17,0.2)","We report a study of spin-waves in ferromagnetic La$_{1-x}$Ca$_{x}$MnO$_3$,
+at concentrations x=0.17 and x=0.2 very close to the metallic transition
+(x=0.225). Below T$_C$, in the quasi-metallic state (T=150K), nearly
+q-independent energy levels are observed. They are characteristic of standing
+spin waves confined into finite-size ferromagnetic domains, defined in {\bf a,
+b) plane for x=0.17 and in all q-directions for x=0.2. They allow an estimation
+of the domain size, a few lattice spacings, and of the magnetic coupling
+constants inside the domains. These constants, anisotropic, are typical of an
+orbital-ordered state, allowing to characterize the domains as ""hole-poor"". The
+precursor state of the CMR metallic phase appears, therefore, as an assembly of
+small orbital-ordered domains.",0408611v2
+2005-01-10,Band structure and magnetotransport of a two-dimensional electron gas in the presence of spin-orbit interaction,"The band structure and magnetotransport of a two-dimensional electron gas
+(2DEG), in the presence of the Rashba (RSOI) and Dresselhaus (DSOI) terms of
+the spin-orbit interaction and of a perpendicular magnetic field, is
+investigated. Exact and approximate analytical expressions for the band
+structure are obtained and used to calculate the density of states (DOS) and
+the longitudinal magnetoresitivity assuming a Gaussian type of level
+broadening. The interplay between the Zeeman coupling and the two terms of the
+SOI is discussed. If the strengths $\alpha$ and $ \beta$, of the RSOI and DSOI,
+respectively, are equal and the $g$ factor vanishes, the two spin states are
+degenerate and a shifted Landau-level structure appears. With the increase of
+the difference $\alpha- \beta$, a novel beating pattern of the DOS and of the
+Shubnikov-de Haas (SdH) oscillations appears distinctly different from that
+occurring when one of these strengths vanishes.",0501214v1
+2005-05-10,Electronically smectic-like phase in a nearly half-doped manganite,"We use neutron scattering to study the spin and charge/orbital ordering
+(CO-OO) in the nearly half-doped perovskite manganite
+$Pr_{0.55}(Ca_{0.8}Sr_{0.2})_{0.45}MnO_3$ (PCSMO). On cooling from room
+temperature, PCSMO first enters into a CO-OO state below $T_{CO}$ and then
+becomes a CE-type long-range ordered antiferromagnet below $T_N$. At
+temperatures above $T_N$ but below $T_{CO}$ ($T_N<T<T_{CO}$), the spins in
+PCSMO form highly anisotropic smectic liquid-crystal-like texture with
+ferromagnetic (FM) quasi-long-range ordered one-dimensional zigzag chains
+weakly coupled antiferromagnetically. Such a magnetic smectic-like phase
+results directly from the spin-orbit interaction and demonstrates the presence
+of textured `electronic soft' phases in doped Mott insulators.",0505255v2
+2006-07-31,Colossal magnetostriction and negative thermal expansion in the frustrated antiferromagnet ZnCr2Se4,"A detailed investigation of ZnCr2Se4 is presented which is dominated by
+strong ferromagnetic exchange but orders antiferromagnetically at T_N = 21 K.
+Specific heat C and thermal expansion Delta L/L exhibit sharp first-order
+anomalies at the antiferromagnetic transition. T_N is strongly reduced and
+shifted to lower temperatures by external magnetic fields and finally is fully
+suppressed suggesting a field induced quantum critical behavior close to 60
+kOe. Delta L/L(T) is unusually large and exhibits negative thermal expansion
+below 75 K down to T_N indicating strong frustration of the lattice.
+Magnetostriction Delta L/L(H) reveals colossal values (0.5x10^{-3}) comparable
+to giant magnetostriction materials. Electron-spin resonance, however, shows
+negligible spin-orbital coupling excluding orbitally induced Jahn-Teller
+distortions. The obtained results point to a spin-driven origin of the
+structural instability at T_N explained in terms of competing ferromagnetic and
+antiferromagnetic exchange interactions yielding strong bond frustration.",0607811v1
+2006-09-27,Optimized Effective Potential Method in Current-Spin Density Functional Theory,"Current-spin density functional theory (CSDFT) provides a framework to
+describe interacting many-electron systems in a magnetic field which couples to
+both spin- and orbital-degrees of freedom. Unlike in usual (spin-) density
+functional theory, approximations to the exchange-correlation energy based on
+the model of the uniform electron gas face problems in practical applications.
+In this work, explicitly orbital-dependent functionals are used and a
+generalization of the Optimized Effective Potential (OEP) method to the CSDFT
+framework is presented. A simplifying approximation to the resulting integral
+equations for the exchange-correlation potentials is suggested. A detailed
+analysis of these equations is carried out for the case of open-shell atoms and
+numerical results are given using the exact-exchange energy functional. For
+zero external magnetic field, a small systematic lowering of the total energy
+for current-carrying states is observed due to the inclusion of the current in
+the Kohn-Sham scheme. For states without current, CSDFT results coincide with
+those of spin density functional theory.",0609696v1
+2007-11-23,Gap structure in noncentrosymmetric superconductors,"Gap structure in noncentrosymmetric superconductors with spin-orbit band
+splitting is studied using a microscopic model of pairing mediated by phonons
+and/or spin fluctuations. The general form of pairing interaction in the band
+representation is derived, which includes both the intraband and interband
+pairing terms. In the case of isotropic interaction (in particular, for a
+BCS-contact interaction), the interband pairing terms vanish identically at any
+magnitude of the band splitting. The effects of pairing interaction anisotropy
+are analyzed in detail for a metal of cubic symmetry with strong spin-orbit
+coupling. It is shown that if phonons are dominant then the gaps in two bands
+are isotropic, nodeless, and have in general different amplitudes. Applications
+to the Li_2(Pd_{1-x},Pt_x)_3B family of noncentrosymmetric superconductors are
+discussed.",0711.3681v3
+2008-12-31,Structural distortion and frustrated magnetic interactions in the layered copper oxychloride [CuCl]LaNb(2)O(7),"We present a computational study of the layered copper oxychloride
+[CuCl]LaNb(2)O(7) that has been recently proposed as a spin-1/2 frustrated
+square lattice compound. Our results evidence an orbitally degenerate ground
+state for the reported tetragonal crystal structure and reveal a
+Jahn-Teller-type structural distortion. This distortion heavily changes the
+local environment of copper -- CuO(2)Cl(2) plaquettes are formed instead of
+CuO(2)Cl(4) octahedra -- and restores the single-orbital scenario typical for
+copper oxides and oxyhalides. The calculated distortion is consistent with the
+available diffraction data and the experimental results on the electric field
+gradients for the Cu and Cl sites. The band structure suggests a complex
+three-dimensional spin model with the interactions up to the fourth neighbors.
+Despite the layered structure of (CuCl)LaNb(2)O(7), the spin system has
+pronounced one-dimensional features. Yet, sizable interchain interactions lead
+to the strong frustration and likely cause the spin-gap behavior. Computational
+estimates of individual exchange couplings are in qualitative agreement with
+the experimental data.",0901.0154v2
+2009-10-22,Metal-insulator transition through a semi-Dirac point in oxide nanostructures: VO$_2$ (001) layers confined within TiO$_2$,"Multilayer (TiO$_2$)$_m$/(VO$_2$)$_n$ nanostructures ($d^1$ - $d^0$
+interfaces with no polar discontinuity) show a metal-insulator transition with
+respect to the VO$_2$ layer thickness in first principles calculations. For $n$
+$\geq$ 5 layers, the system becomes metallic, while being insulating for $n$ =
+1 and 2. The metal-insulator transition occurs through a semi-Dirac point phase
+for $n$ = 3 and 4, in which the Fermi surface is point-like and the electrons
+behave as massless along the zone diagonal in k-space and as massive fermions
+along the perpendicular direction. We provide an analysis of the evolution of
+the electronic structure through this unprecedented insulator-to-metal
+transition, and identify it as resulting from quantum confinement producing a
+non-intuitive orbital ordering on the V $d^1$ ions, rather than being a
+specific oxide interface effect. Spin-orbit coupling does not destroy the
+semi-Dirac point for the calculated ground state, where the spins are aligned
+along the rutile c-axis, but it does open a substantial gap if the spins lie in
+the basal plane.",0910.4411v1
+2010-10-18,Gate-controlled weak antilocalization effect in inversion layer on p-type HgCdTe,"We discover weak antilocalization effect of two-dimensional electron gas with
+one electric subband occupied in the inversion layer on p-type HgCdTe crystal.
+By fitting the model of Iordanskii, Lyanda-Geller and Pikus to data at varies
+temperatures and gate voltages, we extract phase coherence and spin-orbit
+scattering times as functions of temperature and carrier density. We find that
+Elliot-Yafet mechanism and Nyquist mechanism are the dominating spin
+decoherence and dephasing mechanisms, respectively. We also find that the
+Rashba parameter is relatively large and the dependence of Rashba parameter
+upon carrier density is not monotonic and an optimal carrier density exists for
+the maximization of spin-orbit coupling.",1010.3464v1
+2011-02-08,Multi-orbital Non-Crossing Approximation from maximally localized Wannier functions: the Kondo signature of copper phthalocyanine on Ag (100),"We have developed a multi-orbital approach to compute the electronic
+structure of a quantum impurity using the non-crossing approximation. The
+calculation starts with a mean-field evaluation of the system's electronic
+structure using a standard quantum chemistry code. Here we use density
+functional theory (DFT). We transformed the one-electron structure into an
+impurity Hamiltonian by using maximally localized Wannier functions (MLWF).
+Hence, we have developed a method to study the Kondo effect in systems based on
+an initial one-electron calculation. We have applied our methodology to a
+copper phthalocyanine molecule chemisorbed on Ag (100), and we have described
+its spectral function for three different cases where the molecule presents a
+single spin or two spins with ferro- and anti-ferromagnetic exchange couplings.
+We find that the use of broken-symmetry mean-field theories such as Kohn-Sham
+DFT cannot deal with the complexity of the spin of open-shell molecules on
+metal surfaces and extra modeling is needed.",1102.1667v2
+2011-06-02,Microscopic Study of Electronic and Magnetic Properties for Ir Oxide,"The exact diagonalization and the variational cluster approximation (VCA) are
+used to study the nature of a novel Mott insulator induced by a strong
+spin-orbit coupling for a two-dimensional three-band Hubbard model consisting
+of the $t_{2g}$ manifold of $5d$ orbitals. To characterize the ground state, we
+introduce a local Kramer's doublet which can represent a state with effective
+angular momentum $J_{\rm eff}=|{\bm S}-{\bm L}|=1/2$ as well as spin $S=1/2$.
+Our systematic study of the pseudo-spin structure factor defined by the
+Kramer's doublet shows that the $J_{\rm eff}=1/2$ Mott insulator is smoothly
+connected to the $S=1/2$ Mott insulator. Using the Kramer's doublet as a
+variational state for the VCA, we examine the one-particle excitations for the
+Mott insulating phase. These results are compared with recent experiments on
+Sr$_2$IrO$_4$.",1106.0413v1
+2011-06-13,Lattice-Driven Magnetoresistivity and Metal-Insulator Transition in Single-Layered Iridates,"Sr2IrO4 exhibits a novel insulating state driven by spin-orbit interactions.
+We report two novel phenomena, namely a large magnetoresistivity in Sr2IrO4
+that is extremely sensitive to the orientation of magnetic field but exhibits
+no apparent correlation with the magnetization, and a robust metallic state
+that is induced by dilute electron (La3+) or hole (K+) doping for Sr2+ ions in
+Sr2IrO4. Our structural, transport and magnetic data reveal that a strong
+spin-orbit interaction alters the balance between the competing energies so
+profoundly that (1) the spin degree of freedom alone is no longer a dominant
+force; (2) underlying transport properties delicately hinge on the Ir-O-Ir bond
+angle via a strong magnetoelastic coupling; and (3) a highly insulating state
+in Sr2IrO4 is proximate to a metallic state, and the transition is governed by
+lattice distortions. This work suggests that a novel class of lattice-driven
+electronic materials can be developed for applications.",1106.2381v1
+2012-07-06,Energy spectrum reconstruction at the edge of a two-dimensional electron system with strong spin-orbit coupling,"We experimentally demonstrate the simultaneous reconstruction of the bulk and
+the edge energy spectra caused by strong spin-orbit interaction, at the two
+lowest filling factors $\nu=1$ and $\nu=2$ for $In_xGa_{1-x}As$ two-dimensional
+electron system with $x = 0.75$. The observed reconstruction is of different
+character at these filling factors: it is characterized by zeroing of the
+energy gap at the levels crossing point at $\nu=2$, while the reconstruction at
+$\nu=1$ goes through the coexistence of two $\nu=1$ quantum Hall phases with
+different spin projections. An analysis indicates a strong influence of
+many-body interaction on the reconstruction at $\nu=1$.",1207.1627v1
+2012-08-06,Change of an insulator's topological properties by a Hubbard interaction,"We introduce two dimensional fermionic band models with two orbitals per
+lattice site, or one spinful orbital, and which have a non-zero topological
+Chern number that can be changed by varying the ratio of hopping parameters. A
+topologically non-trivial insulator is then realized if there is one fermion
+per site. When interactions in the framework of the Hubbard model are
+introduced, the effective hopping parameters are renormalized and the system's
+topological number can change at a certain interaction strength, $U=\bar U$,
+smaller than that for the Mott transition. Two different situations may then
+occur: either the anomalous Hall conductivity $\sigma_{xy}$ changes abruptly at
+$\bar U$, as the system undergoes a transition from one topologically
+non-trivial insulator to another, or the transition is through an anomalous
+Hall metal, and $\sigma_{xy}$ changes smoothly between two different quantized
+values as $U$ grows. Restoring time-reversal symmetry by adding spin to
+spinless models, the half-filled system becomes a $\mathbb{Z}_2$ topological
+insulator. The topological number $\nu$ then changes at a critical coupling
+$\bar U$ and the quantized spin Hall response changes abruptly.",1208.1289v2
+2012-09-20,Rashba Spin Orbit Interaction and Birefringent Electron Optics in Graphene,"Electron optics exploits the analogies between rays in geometrical optics and
+electron trajectories, leading to interesting insights and potential
+applications. Graphene, with its two-dimensionality and photon-like behavior of
+its charge carriers, is the perfect candidate for the exploitation of electron
+optics. We show that a circular gate-controlled region in the presence of
+Rashba spin-orbit interaction in graphene may indeed behave as a Veselago
+electronic lens but with two different indices of refraction. We demonstrate
+that this birefringence results in complex caustics patterns for a circular
+gate, selective focusing of different spins, and the possible direct
+measurement of the Rashba coupling strength in scanning probe experiments.",1209.4415v2
+2013-07-09,Topological and edge state properties of a three-band model for Sr2RuO4,"Modeling the spin-triplet superconductor Sr2RuO4 through a three-orbital
+tight-binding model we investigate topological properties and edge states
+assuming chiral p-wave pairing. In concordance with experiments the three Fermi
+surfaces consist of two electron-like and one hole-like one corresponding to
+the alpha-, beta- and gamma-band on the level of a two-dimensional system. The
+quasi-particle spectra and other physical quantities of the superconducting
+phase are calculated by means of a self-consistent Bogoliubov-de Gennes
+approach for a ribbon shaped system. While a full quasiparticle excitation gap
+is realized in the bulk system, at the edges gapless states appear some of
+which have linear and others nearly flat dispersion around zero energy. This
+study shows the interplay between spin-orbit coupling induced spin currents,
+chiral edge currents and correlation driven surface magnetism. The topological
+nature of the chiral p-wave state manifests itself in the gamma-band
+characterized by an integer Chern number. As the gamma-band is close to a
+Lifshitz transition in Sr2RuO4, changing the sign of the Chern number, the
+topological nature may be rather fragile.",1307.2382v2
+2013-12-04,Rashba Spin-Orbit Anisotropy and the Electric Field Control of Magnetism,"The control of the magnetism of ultra-thin ferromagnetic layers using an
+electric field rather than a current, if large enough, would lead to many
+technologically important applications. To date, while it is usually assumed
+the changes in the magnetic anisotropy, leading to such a control, arises from
+surface charge doping of the magnetic layer, a number of key experiments cannot
+be understood within such a scenario. Much studied is the fact that, for
+non-magnetic metals or semi-conductors, a large surface electric field gives
+rise to a Rashba spin-orbit coupling which leads to a spin-splitting of the
+conduction electrons. For a magnet, this splitting is modified by the exchange
+field resulting in a large magnetic anisotropy energy via the
+Dzyaloshinskii-Moriya mechanism. This different, yet traditional, path to an
+electrically induced anisotropy energy can explain the electric field,
+thickness, and material dependence reported in many experiments.",1312.1021v1
+2014-02-10,Magnetic edge anisotropy in graphene-like honeycomb crystals,"The independent predictions of edge ferromagnetism and the Quantum Spin Hall
+phase in graphene have inspired the quest of other two dimensional honeycomb
+systems, such as silicene, germanene, stanene, iridiates, and organometallic
+lattices, as well as artificial superlattices, all of them with electronic
+properties analogous to those of graphene, but much larger spin orbit coupling.
+Here we study the interplay of ferromagnetic order and spin orbit interactions
+at the zigzag edges of these graphene-like systems. We find an in-plane
+magnetic anisotropy that opens a gap in the otherwise conducting edge channels,
+that should result in large changes of electronic properties upon rotation of
+the magnetization.",1402.2235v2
+2014-07-15,Strong competition between orbital-ordering and itinerancy in a frustrated spinel vanadate,"The crossover from localized- to itinerant-electron behavior is associated
+with many intriguing phenomena in condensed-matter physics. In this paper, we
+investigate the crossover from localized to itinerant regimes in the spinel
+system Mn$_{1-x}$Co$_x$V$_2$O$_4$. At low Co doping, orbital order (OO) of the
+localized electrons on the V3+ ions suppresses magnetic frustration by
+triggering a tetragonal distortion. With Co doping, electronic itinerancy melts
+the OO and suppresses the structural phase transition while the reduced
+spin-lattice coupling produces magnetic frustration. Neutron scattering
+measurements and first-principles-guided spin models reveal that the
+non-collinear state at high Co doping is produced by weakened local anisotropy
+and enhanced Co-V spin interactions.",1407.4143v2
+2014-07-28,Topological states of non-Dirac electrons on triangular lattice,"We demonstrate the possibility of topological states for non-Dirac electrons.
+Specifically it is shown that, because of the $C_{\rm 3}$ crystal symmetry and
+time reversal symmetry, $p_x$ and $p_y$ orbits accommodated on triangular
+lattice exhibit a quadratic band touching at $\Gamma$ point at the Fermi level.
+When the atomic spin-orbit coupling (SOC) is taken into account, a gap is
+opened resulting in a quantum spin Hall effect state. As revealed explicitly by
+a $k\cdot p$ model, the topology is associated with a meron structure in the
+pseudo spin texture with vorticity two, a mechanism different from honeycomb
+lattice and the band inversion. One possible realization of this scheme is the
+1/3 coverage by Bi atom adapted on the Si[111] surface. First-principle
+calculations are carried out, and a global gap of $\sim 0.15$eV is observed.
+With the Si substrate taking part in realizing the nontrivial topology, the
+present template is expected to make the integration of topological states into
+existing electronics and photonics technologies promising.",1407.7320v1
+2015-04-21,Anisotropic interactions opposing magnetocrystalline anisotropy in Sr$_3$NiIrO$_6$,"We report our investigation of the electronic and magnetic excitations of
+Sr$_3$NiIrO$_6$ by resonant inelastic x-ray scattering at the Ir L$_3$ edge.
+The intra-$t_{2g}$ electronic transitions are analyzed using an atomic model,
+including spin-orbit coupling and trigonal distortion of the IrO$_6$
+octahedron, confronted to {\it ab initio} quantum chemistry calculations. The
+Ir spin-orbital entanglement is quantified and its implication on the magnetic
+properties, in particular in inducing highly anisotropic magnetic interactions,
+is highlighted. These are included in the spin-wave model proposed to account
+for the dispersionless magnetic excitation that we observe at 90 meV. By
+counterbalancing the strong Ni$^{2+}$ easy-plane anisotropy that manifests
+itself at high temperature, the anisotropy of the interactions finally leads to
+the remarkable easy-axis magnetism reported in this material at low
+temperature.",1504.05420v2
+2015-04-29,Dirac Semimetals in Two Dimensions,"Graphene is famous for being a host of 2D Dirac fermions. However, spin-orbit
+coupling introduces a small gap, so that graphene is formally a quantum spin
+hall insulator. Here we present symmetry-protected 2D Dirac semimetals, which
+feature Dirac cones at high-symmetry points that are \emph{not} gapped by
+spin-orbit interactions, and exhibit behavior distinct from both graphene and
+3D Dirac semimetals. Using a two-site tight-binding model, we construct
+representatives of three possible distinct Dirac semimetal phases, and show
+that single symmetry-protected Dirac points are impossible in two dimensions.
+An essential role is played by the presence of non-symmorphic space group
+symmetries. We argue that these symmetries tune the system to the boundary
+between a 2D topological and trivial insulator. By breaking the symmetries we
+are able to access trivial and topological insulators as well as Weyl semimetal
+phases.",1504.07977v2
+2015-10-30,Identifying the Stern-Gerlach force of classical electron dynamics,"Different classical theories are commonly applied in various branches of
+physics to describe the relativistic dynamics of electrons by coupled equations
+for the orbital motion and spin precession. Exemplarily, we benchmark the
+Frenkel model and the classical Foldy-Wouthuysen model with spin-dependent
+forces (Stern-Gerlach forces) to the quantum dynamics as predicted by the Dirac
+equation. Both classical theories can lead to different or even contradicting
+predictions how the Stern-Gerlach forces modify the electron's orbital motion,
+when the electron moves in strong electromagnetic field configurations of
+emerging high-intensity laser facilities. In this way, one may evaluate the
+validity and identify the limits of these classical theories via a comparison
+with possible experiments to provide a proper description of spin-induced
+dynamics. Our results indicate that the Foldy-Wouhuysen model is qualitatively
+in better agreement with the Dirac theory than the widely used Frenkel model.",1510.09145v2
+2016-01-07,Topological Protection from Random Rashba Spin-Orbit Backscattering: Ballistic Transport in a Helical Luttinger Liquid,"The combination of Rashba spin-orbit coupling and potential disorder induces
+a random current operator for the edge states of a 2D topological insulator. We
+prove that charge transport through such an edge is ballistic at any
+temperature, with or without Luttinger liquid interactions. The solution
+exploits a mapping to a spin 1/2 in a time-dependent field that preserves the
+projection along one randomly undulating component (integrable dynamics). Our
+result is exact and rules out random Rashba backscattering as a source of
+temperature-dependent transport, absent integrability-breaking terms.",1601.01684v2
+2016-01-22,Optimal geometry of lateral GaAs and Si/SiGe quantum dots for electrical control of spin qubits,"We investigate the effects of the orientation of the magnetic field and the
+orientation of a quantum dot, with respect to crystallographic coordinates, on
+the quality of an electrically controlled qubit realized in a gated
+semiconductor quantum dot. We find that, due to the anisotropy of the
+spin-orbit interactions, varying the two orientations it is possible to tune
+the qubit in the sense of optimizing the ratio of its couplings to phonons and
+to a control electric field. We find conditions under which such optimal setup
+can be reached by solely reorienting the magnetic field, and when a specific
+positioning of the dot is required. We also find that the knowledge of the
+relative sign of the spin-orbit interactions strengths allows to choose a
+robust optimal dot geometry, with the dot main axis along [110], or
+[1$\overline{1}$0], where the qubit can be always optimized by reorienting the
+magnetic field.",1601.05881v2
+2017-02-23,Spin-Orbit Coupling of Conduction Electrons in Magnetization Switching,"Strong magnetic field pulses associated with a relativistic electron bunch
+can imprint switching patterns in magnetic thin films that have uniaxial
+in-plane anisotropy. In experiments with Fe and FeCo alloy films the pattern
+shape reveals an additional torque acting on magnetization during the short (in
+the 100fs time scale) magnetic field pulse. The magnitude of the torque is as
+high as 15% of the torque from the magnetic field. The torque symmetry is that
+of a uniaxial anisotropy along the direction of the eddy current screening the
+magnetic field. Spin-orbit interaction acting on the conduction electrons can
+produce such a torque with the required symmetry and magnitude. The same
+interaction causes the anomalous Hall current to be spin-polarized, exerting a
+back reaction on magnetization direction. Such a mechanism may be at work in
+all-optical laser switching of magnetic materials.",1702.07153v1
+2018-11-04,Current cross-correlation in the Anderson impurity model with exchange interaction,"We study spin-entanglement of the quasiparticles of the local Fermi liquid
+excited in nonlinear current through a quantum dot described by the Anderson
+impurity model with two degenerate orbitals coupled to each other via an
+exchange interaction. Applying the renormalized perturbation theory, we obtain
+the precise form of the cumulant generating function and cross-correlations for
+the currents with spin angled to arbitrary directions, up to third order in the
+applied bias voltage. It is found that the exchange interaction gives rise to
+spin-angle dependency in the cross-correlation between the currents through the
+two different orbitals, and also brings an intrinsic cross-correlation of
+currents with three different angular momenta.",1811.01451v2
+2018-11-09,Optical orientation with linearly polarized light in transition metal dichalcogenides,"We study the optical properties of semiconducting transition metal
+dichalcogenide monolayers under the influence of strong out-of-plane magnetic
+fields, using the effective massive Dirac model. We pay attention to the role
+of spin-orbit coupling effects, doping level and electron-electron
+interactions, treated at the Hartree-Fock level. We find that optically-induced
+valley and spin imbalance, commonly attained with circularly polarized light,
+can also be obtained with linearly polarized light in the doped regime.
+Additionally, we explore an exchange-driven mechanism to enhance the spin-orbit
+splitting of the conduction band, in n-doped systems, controlling both the
+carrier density and the intensity of the applied magnetic field.",1811.04003v2
+2020-07-16,Complete Multipole Basis Set for Single-Centered Electron Systems,"A whole series of expressions for four species of multipoles (electric,
+magnetic, magnetic toroidal, and electric toroidal) is provided as a complete
+basis set to describe arbitrary single-centered spinful electron systems. A
+compact formula to calculate matrix elements of these multipoles is also
+derived. A visualization method of an electronic state characterized in terms
+of multipoles is proposed. The complete basis set is useful to narrow down a
+candidate order parameter of electron systems in phase transition, to describe
+a property of cross-correlated phenomena, to analyze spectra of x-ray
+scattering in magnetically ordered state, and so on. We demonstrate a usage of
+the complete basis set by taking monopole and toroidal dipole orderings, and
+the mutual relationship among three distinct magnetic dipoles (orbital, spin
+angular momenta and anisotropic dipole) in a spin-orbit coupled system as prime
+examples.",2007.08039v2
+2013-08-13,Strain effects on the spin-orbit induced band structure splittings in monolayer MoS2 and graphene,"The strain effects on the spin-orbit induced splitting of the valence band
+maximum and conduction band minimum in monolayer MoS2 and the gap in graphene
+are calculated using first-principles calculations. The dependence of these
+splittings on the various symmetry types of strain is described by means of an
+effective Hamiltonian based on the method of invariants and the parameters in
+the model are extracted by fitting to the theory. These splittings are related
+to acoustic phonon deformation potentials, or electron-phonon coupling matrix
+elements which enter the spin-dependent scattering theory of conduction in
+these materials.",1308.2733v1
+2017-01-26,Mechanism for nematic superconductivity in FeSe,"Despite its seemingly simple composition and structure, the pairing mechanism
+of FeSe remains an open problem due to several striking phenomena. Among them
+are nematic order without magnetic order, nodeless gap and unusual inelastic
+neutron spectra with a broad continuum, and gap anisotropy consistent with
+orbital selection of unknown origin. Here we propose a microscopic description
+of a nematic quantum spin liquid that reproduces key features of neutron
+spectra. We then study how the spin fluctuations of the local moments lead to
+pairing within a spin-fermion model. We find the resulting superconducting
+order parameter to be nodeless $s\pm d$-wave within each domain. Further we
+show that orbital dependent Hund's coupling can readily capture observed gap
+anisotropy. Our prediction calls for inelastic neutron scattering in a
+detwinned sample.",1701.07813v2
+2018-05-04,Rotational-tidal phasing of the binary neutron star waveform,"Tidal forces cause inspiralling binary neutron stars to deform, leaving a
+measurable imprint on the gravitational waves they emit. The induced stellar
+multipoles are an added source of gravitational radiation and modify the
+orbital dynamics, producing a slight acceleration of the coalescence which
+manifests as a phase shift in the waveform relative to point-particles. The
+dominant piece of this tidal phase comes from the mass quadrupoles, which
+contribute at fifth post-Newtonian order (5PN). Current quadrupoles and mass
+octupoles contribute at higher orders. For spinning neutron stars, additional
+multipole moments are induced by nonlinear couplings between spin and tides. We
+calculate these rotational-tidal deformations assuming the stars are rotating
+slowly and the tides are weak and quasi-stationary. The stellar multipole
+moments are read off from an asymptotically flat metric that encodes the
+difference between their tidal response and a black hole's. The multipoles are
+subsequently inserted into post-Newtonian formulas for the orbit and the
+gravitational radiation. We find that, at leading order, the rotational-tidal
+deformations make a 6.5PN contribution to the tidal phase. Their effect on the
+waveform is thus larger than that of the mass octupoles, and nearly as large as
+that of the current quadrupoles, in systems with non-negligible spin.",1805.01882v1
+2018-05-10,Spin freezing and the Sachdev-Ye model,"Spin-freezing is the origin of bad-metal physics and non-Fermi liquid
+(non-FL) properties in a broad range of correlated compounds. In a
+multi-orbital lattice system with Hund coupling, doping of the half-filled Mott
+insulator results in a highly incoherent metal with frozen magnetic moments.
+These moments fluctuate and collapse in a crossover region that is
+characterized by unusual non-Fermi liquid properties such as a self-energy
+whose imaginary part varies $\propto \sqrt{\omega}$ over a wide energy range.
+At low enough temperature, the local moment fluctuations induce electron
+pairing and this mechanism may be the unifying principle of unconventional
+superconductivity. While this physics has been discovered in numerical studies
+of multi-orbital Hubbard systems, it exhibits a striking similarity to the
+analytically solvable Sachdev-Ye (SY) model, and its recent fermionic
+extensions. Here, we clarify the relation between spin-freezing and SY physics,
+and thus shed light on fundamental properties of Hund metals.",1805.04102v2
+2013-09-05,Kondo effect and spin quenching in high-spin molecules on metal substrates,"Using a state-of-the art combination of density functional theory and
+impurity solver techniques we present a complete and parameter-free picture of
+the Kondo effect in the high-spin ($S=3/2$) coordination complex known as
+Manganese Phthalocyanine adsorbed on the Pb(111) surface. We calculate the
+correlated electronic structure and corresponding tunnel spectrum and find an
+asymmetric Kondo resonance, as recently observed in experiments. Contrary to
+previous claims, the Kondo resonance stems from only one of three possible
+Kondo channels with origin in the Mn 3d-orbitals, its peculiar asymmetric shape
+arising from the modulation of the hybridization due to strong coupling to the
+organic ligand. The spectral signature of the second Kondo channel is strongly
+suppressed as the screening occurs via the formation of a many-body singlet
+with the organic part of the molecule. Finally, a spin-1/2 in the 3d-shell
+remains completely unscreened due to the lack of hybridization of the
+corresponding orbital with the substrate, hence leading to a spin-3/2
+underscreened Kondo effect.",1309.1324v1
+2016-05-31,Band Structure and Topological Properties of Graphene in a Superlattice Spin Exchange Field,"We analyze the energy spectrum of graphene in the presence of spin-orbit
+coupling and a unidirectionally periodic Zeeman field, focusing on the
+stability and location of Dirac points it may support. It is found that the
+Dirac points at the $K$ and $K'$ points are generically moved to other
+locations in the Brillouin zone, but that they remain present when the Zeeman
+field $\vec{\Delta}(x)$ integrates to zero within a unit cell. A large variety
+of locations for the Dirac points is shown to be possible: when $\vec\Delta
+\parallel \hat{z}$ they are shifted from their original locations along the
+direction perpendicular to the superlattice axis, while realizations of
+$\vec\Delta(x)$ that rotate periodically move the Dirac points to locations
+that can reflect the orbit of the rotating electron spin as it moves through a
+unit cell. When a uniform Zeeman field is applied in addition to a periodic
+$\vec\Delta \parallel \hat{z}$ integrating to zero, the system can be brought
+into a metallic, Dirac semimetal, or insulating state, depending on the
+direction of the uniform field. The latter is shown to be an anomalous quantum
+Hall insulator.",1605.09485v1
+2018-01-29,Hall effect driven by non-collinear magnetic polarons in diluted magnetic semiconductors,"In this letter we develop the theory of Hall effect driven by non-collinear
+magnetic textures (topological Hall effect - THE) in diluted magnetic
+semiconductors (DMS). We show that a carrier spin-orbit interaction induces a
+chiral magnetic ordering inside a bound magnetic polaron (BMP). The inner
+structure of non-collinear BMP is controlled by the type of spin-orbit
+coupling, allowing to create skyrmion- (Rashba) or antiskyrmion-like
+(Dresselhaus) configurations. The asymmetric scattering of itinerant carriers
+on polarons leads to the Hall signal which exists in weak external magnetic
+fields and low temperatures. We point out that DMS-based systems allow one to
+investigate experimentally the dependence of THE both on a carrier spin
+polarization and on a non-collinear magnetic texture shape.",1801.09459v1
+2018-09-04,"Computational study of heavy group IV elements (Ge, Sn, Pb) triangular lattice atomic layers on SiC(0001) surface","Group IV heavy elements atomic layers are expected to show an interesting
+physical properties due to their large spin-orbit coupling (SOC). Using density
+functional theory (DFT) calculations with/without SOC we investigate the
+variation of group IV heavy elements overlayers, namely dense triangular
+lattice atomic layers (TLAL) on the surface of SiC(0001) semiconductor. The
+possibility of such layers formation and their properties have not been
+addressed before. Here we show, that these layers may indeed be stable and,
+owing to peculiar bonding configuration, exhibit robust Dirac-like energy bands
+originating from $p_x+p_y$ orbitals and localized mostly within the layer, and
+$p_z$ band localized outside the layer and interacting with SiC substrate. We
+found that a $T_1$ adsorption site is most favorable for such TLAL structure
+and this results in an unusual SOC-induced spin polarization of the states
+around $\bar{K}$ points of Brillouin zone, namely the coexistence of Rashba-
+and Zeeman-like spin polarization of different states. We explain this
+phenomena in terms of symmetry of partial electronic density rather than
+symmetry of atomic structure.",1809.00829v1
+2019-09-19,Microscopic theory of in-plane critical field in two-dimensional Ising superconducting systems,"We study the in-plane critical magnetic field of two-dimensional Ising
+superconducting systems, and propose the microscopic theory for these systems
+with or without inversion symmetry. Protected by certain specific spin-orbit
+interaction which polarizes the electron spin to the out-of-plane direction,
+the in-plane critical fields largely surpass the Pauli limit and show
+remarkable upturn in the zero temperature limit. The impurity scattering and
+Rashba spin-orbit coupling, treated on equal-footing in the microscopic
+framework, both weaken the critical field but in qualitatively different
+manners. The microscopic theory is consistent with recent experimental results
+in stanene and Pb superconducting ultra-thin films.",1909.08819v1
+2017-05-06,Model of ultrafast demagnetization driven by spin-orbit coupling in a photoexcited antiferromagnetic insulator Cr2O3,"We theoretically study the dynamic time evolution following laser pulse
+pumping in an antiferromagnetic insulator Cr$_{2}$O$_{3}$. From the
+photoexcited high-spin quartet states to the long-lived low-spin doublet
+states, the ultrafast demagnetization processes are investigated by solving the
+dissipative Schr\""odinger equation. We find that the demagnetization times are
+of the order of hundreds of femtosecond, in good agreement with recent
+experiments. The switching times could be strongly reduced by properly tuning
+the energy gaps between the multiplet energy levels of Cr$^{3+}$. Furthermore,
+the relaxation times also depend on the hybridization of atomic orbitals in the
+first photoexcited state. Our results suggest that the selective manipulation
+of electronic structure by engineering stress-strain or chemical substitution
+allows effective control of the magnetic state switching in photoexcited
+insulating transition-metal oxides.",1705.02439v2
+2018-03-02,Interference in spin-orbit coupled transverse magnetic focusing; emergent phase due to in-plane magnetic fields,"Spin-orbit (SO) interactions in two dimensional systems split the Fermi
+surface, and allow for the spatial separation of spin-states via transverse
+magnetic focusing (TMF). In this work, we consider the case of combined Rashba
+and Zeeman interactions, which leads to a Fermi surface without cylindrical
+symmetry. While the classical trajectories are effectively unchanged, we
+predict an additional contribution to the phase, linear in the applied in-plane
+magnetic field. We show that this term is unique to TMF, and vanishes for
+magnetic (Shubnikov de Haas) oscillations. Finally we propose some experimental
+signatures of this phase.",1803.00714v1
+2018-08-08,Gate-tunable infrared plasmons in electron-doped single-layer antimony,"We report on a theoretical study of collective electronic excitations in
+single-layer antimony crystals (antimonene), a novel two-dimensional
+semiconductor with strong spin-orbit coupling. Based on a tight-binding model,
+we consider electron-doped antimonene and demonstrate that the combination of
+spin-orbit effects with external bias gives rise to peculiar plasmon
+excitations in the mid-infrared spectral range. These excitations are
+characterized by low losses and negative dispersion at frequencies effectively
+tunable by doping and bias voltage. The observed behavior is attributed to the
+spin-splitting of the conduction band, which induces interband resonances,
+affecting the collective excitations. Our findings open up the possibility to
+develop plasmonic and optoelectronic devices with high tunability, operating in
+a technologically relevant spectral range.",1808.02619v2
+2018-08-16,Angular momentum-dependent topological transport and its experimental realization using a transmission line network,"Novel classical wave phenomenon analogs of the quantum spin Hall effect are
+mostly based on the construction of pseudo-spins. Here we show that the
+non-trivial topology of a system can also be realized using orbital angular
+momentum through angular-momentum-orbital coupling. The idea is illustrated
+with a tight-binding model and experimentally demonstrated with a transmission
+line network. We show experimentally that even a very small network cluster
+exhibits one-way topological edge states, and their properties can be described
+in terms of local Chern numbers. Our work provides a new mechanism to realize
+counterparts of the quantum spin Hall effect in classical waves and may offer
+insights for other systems.",1808.05413v1
+2019-08-21,Skyrme Functional with Tensor Terms from ab initio Calculations: Results for the Spin-Orbit Splittings,"A new Skyrme functional including tensor terms is presented. The tensor terms
+have been determined by fitting the results of relativistic
+Brueckner-Hartree-Fock (RBHF) studies on neutron-proton drops. Unlike all
+previous studies, where the tensor terms were usually determined by fitting to
+experimental data of single-particle levels, the pseudodata calculated by RBHF
+does not contain beyond mean-field effect such as the particle-vibration
+coupling and, therefore, can provide information on the tensor term without
+ambiguities. The obtained new functional, named SAMi-T, can describe well
+ground-state properties such as binding energies, radii, spin-orbit splittings
+and, at the same time, the excited state properties such as those of the Giant
+Monopole Resonance (GMR), Giant Dipole Resonance (GDR), Gamow-Teller Resonance
+(GTR), and Spin-Dipole Resonance (SDR).",1908.08090v1
+2019-12-16,Thermalization of photoexcited carriers in two-dimensional transition metal dichalcogenides and internal quantum efficiency of van der Waals heterostructures,"Van der Waals semiconductor heterostructures could be a platform to harness
+hot photoexcited carriers in the next generation of optoelectronic and
+photovoltaic devices. The internal quantum efficiency of hot-carrier devices is
+determined by the relation between photocarrier extraction and thermalization
+rates. Using \textit{ab-initio} methods we show that the photocarrier
+thermalization time in single-layer transition metal dichalcogenides strongly
+depends on the peculiarities of the phonon spectrum and the electronic
+spin-orbit coupling. In detail, the lifted spin degeneracy in the valence band
+suppresses the hole scattering on acoustic phonons, slowing down the
+thermalization of holes by one order of magnitude as compared to electrons.
+Moreover, the hole thermalization time behaves differently in MoS$_2$ and
+WSe$_2$ because spin-orbit interactions differ in these seemingly similar
+materials. We predict that the internal quantum efficiency of a tunneling van
+der Waals semiconductor heterostructure depends qualitatively on whether
+MoS$_2$ or WSe$_2$ is used.",1912.07480v1
+2020-10-01,"Anisotropic spin distribution and perpendicular magnetic anisotropy in the layered ferromagnetic semiconductor (Ba,K)(Zn,Mn)$_{2}$As$_{2}$","Perpendicular magnetic anisotropy of the new ferromagnetic semiconductor
+(Ba,K)(Zn,Mn)$_{2}$As$_{2}$ is studied by angle-dependent x-ray magnetic
+circular dichroism measurements. The large magnetic anisotropy with the
+anisotropy field of 0.85 T is deduced by fitting the Stoner-Wohlfarth model to
+the magnetic-field-angle dependence of the projected magnetic moment.
+Transverse XMCD spectra highlights the anisotropic distribution of Mn 3$d$
+electrons, where the $d_{xz}$ and $d_{yz}$ orbitals are less populated than the
+$d_{xy}$ state because of the $D_{2d}$ splitting arising from the elongated
+MnAs$_{4}$ tetrahedra. It is suggested that the magnetic anisotropy originates
+from the degeneracy lifting of $p$-$d_{xz}$, $d_{yz}$ hybridized states at the
+Fermi level and resulting energy gain due to spin-orbit coupling when spins are
+aligned along the $z$ direction.",2010.00158v1
+2020-11-27,Ultrafast spin dynamics in inhomogeneous systems: a density-matrix approach applied to Co/Cu interfaces,"Ultrafast spin dynamics on femto- to picosecond timescales is simulated
+within a density-operator approach for a Co/Cu bilayer. The electronic
+structure is represented in a tight-binding form; during the evolution of the
+density operator, optical excitation by a femtosecond laser pulse, coupling to
+a bosonic bath as well as dephasing are taken into account. Our simulations
+corroborate the importance of interfaces for ultrafast transport phenomena and
+demagnetisation processes. Moreover, we establish a reflow from Cu $d$ orbitals
+across the interface into Co $d$ orbitals, which shows up prominently in the
+mean occupation numbers. On top of this, this refilling manifests itself as a
+minority-spin current proceeding several layers into the Cu region. The present
+study suggests that the approach captures essential ultrafast phenomena and
+provides insight into microscopic processes.",2011.13763v1
+2021-04-21,Possible two-component spin-singlet pairings in Sr2RuO4,"Recent experiments suggest a multi-component pairing function in Sr2RuO4,
+which appears to be inconsistent with the absence of an apparent cusp in the
+transition temperature (Tc) as a function of the uniaxial strain. We show,
+however, that the theoretical cusp in Tc for a multi-component pairing can be
+easily smeared out by the spatial inhomogeneity of strain, and the experimental
+data can be reproduced qualitatively by a percolation model. This shed new
+light on multi-component pairings. We then perform a thorough group-theoretical
+classification of the pairing functions, taking the spin-orbit coupling into
+account. We list all 13 types of two-component spin-singlet pairing functions,
+with 8 of them belonging to the Eg representation. In particular, we find two
+types of intra-orbital pairings in the Eg representation ($k_xk_z$, $k_yk_z$)
+are favorable in view of most existing experiments.",2104.10560v1
+2016-12-28,Symmetry-protected topological states for interacting fermions in alkaline-earth-like atoms,"We discuss the quantum simulation of symmetry-protected topological (SPT)
+states for interacting fermions in quasi-one-dimensional gases of
+alkaline-earth-like atoms such as $^{173}$Yb. Taking advantage of the
+separation of orbital and nuclear-spin degrees of freedom in these atoms, we
+consider Raman-assisted spin-orbit couplings in the clock states, which,
+together with the spin-exchange interactions in the clock-state manifolds, give
+rise to SPT states for interacting fermions. We numerically investigate the
+phase diagram of the system, and study the phase transitions between the SPT
+phase and the symmetry-breaking phases. The interaction-driven topological
+phase transition can be probed by measuring local density distribution of the
+topological edge modes.",1612.08880v3
+2017-07-23,Majorana surface modes of nodal topological pairings in spin-$\frac{3}{2}$ semi-metals,"Multi-component electronic systems can appear in solid state systems with
+active orbital band structures. They exhibit richer structures of topological
+superconductivity beyond the conventional scenarios of spin singlet and triplet
+pairings in spin-$\frac{1}{2}$ systems. Examples include the half-Heusler
+compounds RPtBi series (R for a rare earth element), whose electronic
+structures are described by the effective Luttinger-Kohn model with
+spin-$\frac{3}{2}$ fermions exhibiting strong spin-orbit coupling and band
+conversion. Recent experiments provide evidence to unconventional
+superconductivity in the YPtBi material with nodal spin-septet pairing. We
+systematically study topological pairing structures in spin-$\frac{3}{2}$
+systems with cubic group symmetries and calculate surface Majorana spectra,
+which exhibit both the zero energy flat band and the cubic dispersion. The
+signatures of these surface states in the quasi-particle interference patterns
+are studied, which can be tested in future tunneling experiments.",1707.07261v3
+2018-10-20,Realization of anisotropic compass model on the diamond lattice of Cu$^{2+}$ in CuAl$_2$O$_4$,"Spin-orbit (SO) Mott insulators are regarded as a new paradigm of magnetic
+materials, whose properties are largely influenced by SO coupling and featured
+by highly anisotropic bond-dependent exchange interactions between the
+spin-orbital entangled Kramers doublets, as typically manifested in $5d$
+iridates. Here, we propose that a very similar situation can be realized in
+cuprates when the Cu$^{2+}$ ions reside in a tetrahedral environment, like in
+spinel compounds. Using first-principles electronic structure calculations, we
+construct a realistic model for the diamond lattice of the Cu$^{2+}$ ions in
+CuAl$_2$O$_4$ and show that the magnetic properties of this compound are
+largely controlled by anisotropic compass-type exchange interactions that
+dramatically modify the magnetic ground state by lifting the spiral spin-liquid
+degeneracy and stabilizing a commensurate single-$\boldsymbol{q}$ spiral.",1810.08818v2
+2019-05-17,Spin-valley density wave in moiré materials,"We introduce and study a minimum two-orbital Hubbard model on a triangular
+lattice, which captures the key features of both the trilayer ABC-stacked
+graphene-boron nitride heterostructure and twisted transition metal
+dichalcogenides in a broad parameter range. Our model comprises first- and
+second-nearest neighbor hoppings with valley-contrasting flux that accounts for
+trigonal warping in the band structure. For the strong-coupling regime with one
+electron per site, we derive a spin-orbital exchange Hamiltonian and find the
+semiclassical ground state to be a spin-valley density wave. We show that a
+relatively small second-neighbor exchange interaction is sufficient to
+stabilize the ordered state against quantum fluctuations. Effects of spin- and
+valley Zeeman fields as well as thermal fluctuations are also examined.",1905.07401v1
+2019-06-04,Theory of the giant thermal Hall effect in the high temperature superconductors,"Recent transport measurement finds giant negative thermal Hall signal in the
+pseudo-gap phase of the high temperature superconductors\cite{Taillefer}. Such
+a signal is found to increase in magnitude with decreasing doping and to reach
+its maximum in the half-filled antiferromagnetic ordered parent compounds. It
+is still elusive what is the implication of such a phenomena for the mechanism
+of the pseudo-gap phase. The observation of such a signal may also challenge
+our well established understanding of the parent compounds as perfect
+Heisenberg antiferromagnets. Here we show that such a giant thermal Hall effect
+can be naturally understood as the orbital magnetic response of a quantum
+Heisenberg antiferromagnet with sizable multi-spin exchange coupling. We also
+argue that the observation of the giant thermal Hall effect in the pseudo-gap
+phase imply that the origin of the pseudo-gap in the high temperature
+superconductors is closely related to the antiferromagnetic correlation between
+local spins.",1906.01712v2
+2020-03-10,Dzyaloshinskii-Moriya interaction in absence of spin-orbit coupling,"In contrast to conventional assumptions, we show that the
+Dzyaloshinskii-Moriya interaction can be of non-relativistic origin, in
+particular in materials with a non-collinear magnetic configuration, where
+non-relativistic contributions can dominate over spin-orbit effects. The weak
+antiferromagnetic phase of Mn$_{3}$Sn is used to illustrate these findings.
+Using electronic structure theory as a conceptual platform, all relevant
+exchange interactions are derived for a general, non-collinear magnetic state.
+It is demonstrated that non-collinearity influences all three types of exchange
+interaction and that physically distinct mechanisms, which connect to electron-
+and spin-density and currents, may be used as a general way to analyze and
+understand magnetic interactions of the solid state.",2003.04680v2
+2020-06-25,Plumbene on a magnetic substrate: a combined STM and DFT study,"As heavy analog of graphene, plumbene is a two-dimensional material with
+strong spin-orbit coupling effects. Using scanning tunneling microscopy (STM),
+we observe that Pb forms a flat honeycomb lattice on an Fe monolayer on
+Ir(111). In contrast, without the Fe layer, a c(2x4) structure of Pb on Ir(111)
+is found. We use density functional theory (DFT) calculations to rationalize
+these findings and analyze the impact of the hybridization on the plumbene band
+structure. In the unoccupied states the splitting of the Dirac cone by
+spin-orbit interaction is clearly observed while in the occupied states of the
+freestanding plumbene we find a band inversion that leads to the formation of a
+topologically non-trivial gap. Exchange splitting as mediated by the strong
+hybridization with the Fe layer drives a quantum spin Hall to quantum anomalous
+Hall state transition.",2006.14516v1
+2021-01-29,"Magnetism-driven unconventional effects in Ising superconductors: role of proximity, tunneling, and nematicity","Hybrid Ising superconductor-ferromagnetic insulator heterostructures provide
+a unique opportunity to explore the interplay between proximity-induced
+magnetism, spin-orbit coupling and superconductivity. Here we use a combination
+of first-principles calculations of NbSe$_{2}$/CrBr$_{3}$ heterostructures and
+an analytical theory of Ising superconductivity to analyze the existing
+experiments and provide a complete explanation of highly nontrivial and largely
+counterintuitive effects: an increase in the magnitude of the superconducting
+gap accompanied by the broadening of the tunneling peaks; hysteretic behavior
+of the tunneling conductance that sets in $\approx 2$ K below $T_c$; and
+nematic symmetry breaking in the superconducting state. The microscopic reason
+in all three cases appears to be the interplay between the proximity-induced
+exchange splitting and intrinsic defects. Finally, we predict additional
+interesting effects that at the moment cannot be addressed experimentally:
+spin-filtering when tunneling across CrBr$_{3}$ and tunneling ``hot spots'' in
+momentum space that are anticorrelated with regions where the spin-orbit
+splitting is maximum.",2101.12674v3
+2021-07-05,Unified Treatment of Magnons and Excitons in Monolayer CrI$_3$ from Many-Body Perturbation Theory,"We present first principles calculations of the two-particle excitation
+spectrum of CrI$_3$ using many-body perturbation theory including spin-orbit
+coupling. Specifically, we solve the Bethe-Salpeter equation, which is
+equivalent to summing up all ladder diagrams with static screening and it is
+shown that excitons as well as magnons can be extracted seamlessly from the
+calculations. The resulting optical absorption spectrum as well as the magnon
+dispersion agree very well with recent measurements and we extract the
+amplitude for optical excitation of magnons resulting from spin-orbit
+interactions. Importantly, the results do not rely on any assumptions on the
+microscopic magnetic interactions such as Dzyaloshinskii-Moriya (DM), Kitaev or
+biquadratic interactions and we obtain a model independent estimate of the gap
+between acoustic and optical magnons of 0.3 meV. In addition, we resolve the
+magnon wavefunction in terms of band transitions and show that the magnon
+carries a spin that is significantly smaller than $\hbar$. This highlights the
+importance of terms that do not commute with $S^z$ in any Heisenberg model
+description.",2107.02284v1
+2021-08-09,Realization of 0 - $π$ states in SFIS Josephson junctions. The role of spin-orbit interaction and lattice impurities,"Josephson devices with ferromagnetic barriers have been widely studied. Much
+less is known when the ferromagnetic layer is insulating. In this manuscript we
+investigate the transport properties of superconductor-ferromagnetic
+insulator-superconductor (SFIS) junctions with particular attention to the
+temperature behavior of the critical current, that may be used as a fingerprint
+of the junction. We investigate the specific role of impurities as well as of
+possible spin mixing mechanisms, due to the spin orbit coupling. Transition
+between the 0 and the $\pi$ phases can be properly tuned, thus achieving stable
+$\pi$ junctions over the whole temperature range, that may be possibly employed
+in superconducting quantum circuits.",2108.04292v2
+2021-09-07,"Aspects of topological superconductivity in 2D systems: noncollinear magnetism, skyrmions, and higher-order topology","The review is aimed at highlighting the aspects of topological
+superconductivity in the absence of spin-orbit interaction in two-dimensional
+systems with long-range non-collinear spin ordering or magnetic skyrmions.
+Another purpose is to give a brief introduction to the new concept of
+topological superconductivity, i.e. higher-order topology in two-dimensional
+systems including spin-orbit coupled structures. The formation of Majorana
+modes due to magnetic textures is discussed. The role of effective triplet
+pairings and odd fermion parity of the ground state wave function in different
+systems is emphasized. We describe the peculiarities of the magnetic skyrmions,
+leading to the formation of the Majorana modes and defects on which the modes
+are localized. The problem of braiding in the two-dimensional systems,
+especially in higher-order topological superconductors, is considered.",2109.03169v2
+2021-10-29,Spinons and damped phonons in spin-1/2 quantum-liquid Ba$_{4}$Ir${}_3$O${}_{10}$ observed by Raman scattering,"In spin-1/2 Mott insulators, non-magnetic quantum liquid phases are often
+argued to arise when the system shows no magnetic ordering, but identifying
+positive signatures of these phases or related spinon quasiparticles can be
+elusive. Here we use Raman scattering to provide three signatures for spinons
+in a possible spin-orbit quantum liquid material Ba${}_4$Ir${}_3$O${}_{10}$:
+(1) A broad hump, which we show can arise from Luttinger Liquid spinons in
+Raman with parallel photon polarizations normal to 1D chains; (2) Strong phonon
+damping from phonon-spin coupling via the spin-orbit interaction; and (3) the
+absence of (1) and (2) in the magnetically ordered phase that is produced when
+2% of Ba is substituted by Sr
+((Ba${}_{0.98}$Sr${}_{0.02}$)${}_4$Ir${}_3$O${}_{10}$). The phonon damping via
+itinerant spinons seen in this quantum-liquid insulator suggests a new
+mechanism for enhancing thermoelectricity in strongly correlated conductors,
+through a neutral quantum liquid that need not affect electronic transport.",2110.15916v1
+2022-05-24,Compact Molecular Simulation on Quantum Computers via Combinatorial Mapping and Variational State Preparation,"Compact representations of fermionic Hamiltonians are necessary to perform
+calculations on quantum computers that lack error-correction. A fermionic
+system is typically defined within a subspace of fixed particle number and spin
+while unnecessary states are projected out of the Hilbert space. We provide a
+bijective mapping using combinatoric ranking to bijectively map fermion basis
+states to qubit basis states and express operators in the standard spin
+representation. We then evaluate compact mapping using the Variational Quantum
+Eigensolver (VQE) with the unitary coupled cluster singles and doubles
+excitations (UCCSD) ansatz in the compact representation. Compactness is
+beneficial when the orbital filling is well away from half, and we show at 30
+spin orbital $H_{2}$ calculation with only 8 qubits. We find that the gate
+depth needed to prepare the compact wavefunction is not much greater than the
+full configuration space in practice. A notable observation regards the number
+of calls to the optimizer needed for the compact simulation compared to the
+full simulation. We find that the compact representation converges faster than
+the full representation using the ADAM optimizer in all cases. Our analysis
+demonstrates the effect of compact mapping in practice.",2205.11742v1
+2022-06-08,Spin triplet superconducting pairing in doped MoS$_2$,"Searching for triplet superconductivity has been pursued intensively in a
+broad field of material science and quantum information for decades.
+Nevertheless, these novel states remain rare. Within a simplified effective
+three-orbital model, we reveal a spin triplet pairing in doped MoS$_2$ by
+employing both the finite temperature determinant quantum Monte Carlo approach
+and the ground state constrained-phase quantum Monte Carlo method. In a wide
+filling region of $\avg{n}=0.60-0.80$ around charge neutrality $\avg{n}=2/3$,
+the $f$-wave pairing dominates over other symmetries. The pairing
+susceptibility strongly increases as the on-site Coulomb interaction increases,
+and it is insensitive to spin-orbit coupling.",2206.03850v2
+2022-08-11,Magneto-anisotropic weak antilocalization in near-surface quantum wells,"We investigate the effects of an in-plane magnetic field on the weak
+antilocalization signature of near-surface quantum wells lacking bulk and
+inversion symmetry. The measured magnetoconductivity exhibits a strong
+anisotropy with respect to the direction of the in-plane magnetic field. The
+two-fold symmetry of the observed magneto-anisotropy originates from the
+competition between Rashba and Dresselhaus spin-orbit couplings. The high
+sensitivity of the weak antilocalization to the spin texture produced by the
+combined Zeeman and spin-orbit fields results in very large anisotropy ratios,
+reaching 100%. Using a semiclassical universal model in quantitative agreement
+with the experimental data, we uniquely determine the values of the Dresselhaus
+and Rashba parameters as well as the effective in-plane g-factor of the
+electrons. Understanding these parameters provides new prospects for novel
+applications ranging from spintronics to topological quantum computing.",2208.06050v3
+2022-10-13,Correlated insulating states in carbon nanotubes controlled by magnetic field,"We investigate competing insulating phases in nearly metallic zigzag carbon
+nanotubes, under conditions where an applied magnetic flux approximately closes
+the single particle gap in one valley. Recent experiments have shown that an
+energy gap persists throughout magnetic field sweeps where the single-particle
+picture predicts that the gap should close and reopen. Using a bosonic
+low-energy effective theory to describe the interplay between electron-electron
+interactions, spin-orbit coupling, and magnetic field, we obtain a phase
+diagram consisting of several competing insulating phases that can form in the
+vicinity of the single-particle gap closing point. We characterize these phases
+in terms of spin-resolved charge polarization densities, each of which can
+independently take one of two possible values consistent with the mirror
+symmetry of the system, or can take an intermediate value through a spontaneous
+mirror symmetry breaking transition. In the mirror symmetry breaking phase,
+adiabatic changes of the orbital magnetic flux drive charge and spin currents
+along the nanotube. We discuss the relevance of these results to recent and
+future experiments.",2210.07254v1
+2023-01-04,Magnetization dynamics with time-dependent spin-density functional theory: significance of exchange-correlation torques,"In spin-density-functional theory (SDFT) for noncollinear magnetic materials,
+the Kohn-Sham system features exchange-correlation (xc) scalar potentials and
+magnetic fields. The significance of the xc magnetic fields is not very well
+explored; in particular, they can give rise to local torques on the
+magnetization, which are absent in standard local and semilocal approximations.
+Exact benchmark solutions for a five-site extended Hubbard lattice at half
+filling and in the presence of spin-orbit coupling are compared with SDFT
+results obtained using orbital-dependent exchange-only approximations. The
+magnetization dynamics following short-pulse excitations is found to be
+reasonably well described in the exchange-only approximation for weak to
+moderate interactions. For stronger interactions and near transitions between
+magnetically ordered and frustrated phases, exchange and correlation torques
+tend to compensate each other and must both be accounted for.",2301.01509v1
+2023-09-08,Microscopic analysis of dipole electric and magnetic strengths in $^{156}$Gd,"The dipole electric ($E1$) and magnetic ($M1$) strengths in strongly deformed
+$^{156}$Gd are investigated within a fully self-consistent Quasiparticle Random
+Phase Approximation (QRPA) with Skyrme forces SVbas, SLy6 and SG2. We inspect,
+on the same theoretical footing, low-lying dipole states and the isovector
+giant dipole resonance in $E1$ channel and the orbital scissors resonance as
+well as the spin-flip giant resonance (SFGR) in $M1$ channel. Besides, $E1$
+toroidal mode and low-energy spin-flip $M1$ excitations are considered. The
+deformation splitting and dipole-octupole coupling of electric excitations are
+analyzed. The origin of SFGR gross structure, impact of the residual
+interaction and interference of orbital and spin contributions to SFGR are
+discussed. The effect of the central exchange $\textbf{J}^2$-term from the
+Skyrme functional is demonstrated. The calculations show a satisfactory
+agreement with available experimental data, except for the recent NRF
+measurements of M. Tamkas et al for $M1$ strength at 4-6 MeV, where, in
+contradiction with our calculations and previous $(p,p')$ data, almost no $M1$
+strength was observed.",2309.04294v2
+2023-11-15,Strongly pinned skyrmionic bubbles and higher-order nonlinear Hall resistances at the interface of Pt/FeSi bilayer,"Engineering of magnetic heterostructures for spintronic applications has
+entered a new phase, driven by the recent discoveries of topological materials
+and exfoliated van der Waals materials. Their low-dimensional properties can be
+dramatically modulated in designer heterostructures via proximity effects from
+adjacent materials, thus enabling the realization of diverse quantum states and
+functionalities. Here we investigate spin-orbit coupling (SOC) proximity
+effects of Pt on the recently discovered quasi-two-dimensional ferromagnetic
+state at FeSi surface. Skyrmionic bubbles (SkBs) are formed as a result of the
+enhanced interfacial Dzyloshinskii-Moriya interaction. The strong pinning
+effects on the SkBs are evidenced from the significant dispersion in size and
+shape of the SkBs and are further identified as a greatly enhanced threshold
+current density required for depinning of the SkBs. The robust integrity of the
+SkB assembly leads to the emergence of higher-order nonlinear Hall effects in
+the high current density regime, which originate from nontrivial Hall effects
+due to the noncollinearity of the spin texture, as well as from the
+current-induced magnetization dynamics via the augmented spin-orbit torque.",2311.08730v1
+2024-04-09,Probing Berry phase effect in topological surface states,"We have observed the Berry phase effect associated with interband coherence
+in topological surface states (TSSs) using two-color high-harmonic
+spectroscopy. This Berry phase accumulates along the evolution path of strong
+field-driven election-hole quasiparticles in electronic bands with strong
+spin-orbit coupling. By introducing a secondary weak field, we perturb the
+evolution of Dirac fermions in TSSs and thus provide access to the Berry phase.
+We observe a significant shift in the oscillation phase of the even-order
+harmonics from the spectral interferogram. We reveal that such a modulation
+feature is linked to the geometric phase acquired in the nonperturbative
+dynamics of TSSs. Furthermore, we show that the overwhelming Berry phase effect
+can significantly deform the quantum paths of electron-hole pairs, thus
+enhancing the ability to harness electron spin using lightwaves in quantum
+materials with strong spin-orbit interactions.",2404.06086v1
+2017-12-19,Magnetic phase diagram of the iron pnictides in the presence of spin-orbit coupling: Frustration between $C_2$ and $C_4$ magnetic phases,"We investigate the impact of spin anisotropic interactions, promoted by
+spin-orbit coupling, on the magnetic phase diagram of the iron-based
+superconductors. Three distinct magnetic phases with Bragg peaks at $(\pi,0)$
+and $(0,\pi)$ are possible in these systems: one $C_2$ (i.e. orthorhombic)
+symmetric stripe magnetic phase and two $C_4$ (i.e. tetragonal) symmetric
+magnetic phases. While the spin anisotropic interactions allow the magnetic
+moments to point in any direction in the $C_2$ phase, they restrict the
+possible moment orientations in the $C_4$ phases. As a result, an interesting
+scenario arises in which the spin anisotropic interactions favor a $C_2$ phase,
+but the other spin isotropic interactions favor a $C_4$ phase. We study this
+frustration via both mean-field and renormalization-group approaches. We find
+that, to lift this frustration, a rich magnetic landscape emerges well below
+the magnetic transition temperature, with novel $C_2$, $C_4$, and mixed
+$C_2$-$C_4$ phases. Near the putative magnetic quantum critical point, spin
+anisotropies promote a stable Gaussian fixed point in the renormalization-group
+flow, which is absent in the spin isotropic case, and is associated with a
+near-degeneracy between $C_2$ and $C_4$ phases. We argue that this frustration
+is the reason why most $C_4$ phases in the iron pnictides only appear inside
+the $C_2$ phase, and discuss additional manifestations of this frustration in
+the phase diagrams of these materials.",1712.07192v4
+2018-03-28,"Electronic structure of the Co(0001)/MoS2 interface, and its possible use for electrical spin injection in a single MoS2 layer","The ability to perform efficient electrical spin injection from ferromagnetic
+metals into two-dimensional semiconductor crystals based on transition metal
+dichalcogenide monolayers is a prerequisite for spintronic and valleytronic
+devices using these materials. Here, the hcp Co(0001)/MoS2 interface electronic
+structure is investigated by first-principles calculations based on the density
+functional theory. In the lowest energy configuration of the hybrid system
+after optimization of the atomic coordinates, we show that interface sulfur
+atoms are covalently bound to one, two or three cobalt atoms. A decrease of the
+Co atom spin magnetic moment is observed at the interface, together with a
+small magnetization of S atoms. Mo atoms also hold small magnetic moments which
+can take positive as well as negative values. The charge transfers due to
+covalent bonding between S and Co atoms at the interface have been calculated
+for majority and minority spin electrons and the connections between these
+interface charge transfers and the induced magnetic properties of the MoS2
+layer are discussed. Band structure and density of states of the hybrid system
+are calculated for minority and majority spin electrons, taking into account
+spin-orbit coupling. We demonstrate that MoS2 bound to the Co contact becomes
+metallic due to hybridization between Co d and S p orbitals. For this metallic
+phase of MoS2, a spin polarization at the Fermi level of 16 % in absolute value
+is calculated, that could allow spin injection into the semiconducting MoS2
+monolayer channel. Finally, the symmetry of the majority and minority spin
+electron wave functions at the Fermi level in the Co-bound metallic phase of
+MoS2 and the orientation of the border between the metallic and semiconducting
+phases of MoS2 are investigated, and their impact on spin injection into the
+MoS2 channel is discussed.",1803.10612v1
+2000-05-15,Dynamics of multiply charged ions in intense laser fields,"We numerically investigate the dynamics of multiply charged hydrogenic ions
+in near-optical linearly polarized laser fields with intensities of order 10^16
+to 10^17 W/cm^2. Depending on the charge state Z of the ion the relation of
+strength between laser field and ionic core changes. We find around Z=12
+typical multiphoton dynamics and for Z=3 tunneling behaviour, however with
+clear relativistic signatures. In first order in v/c the magnetic field
+component of the laser field induces a Z-dependent drift in the laser
+propagation direction and a substantial Z-dependent angular momentum with
+repect to the ionic core. While spin oscillations occur already in first order
+in v/c as described by the Pauli equation, spin induced forces via spin orbit
+coupling only appear in the parameter regime where (v/c)^2 corrections are
+significant. In this regime for Z=12 ions we show strong splittings of resonant
+spectral lines due to spin-orbit coupling and substantial corrections to the
+conventional Stark shift due to the relativistic mass shift while those to the
+Darwin term are shown to be small. For smaller charges or higher laser
+intensities, parts of the electronic wavepacket may tunnel through the
+potential barrier of the ionic core, and when recombining are shown to give
+rise to keV harmonics in the radiation spectrum. Some parts of the wavepacket
+do not recombine after ionisation and we find very energetic electrons in the
+weakly relativistic regime of above threshold ionization.",0005053v1
+2008-11-04,"Perspectives in spintronics: magnetic resonant tunneling, spin-orbit coupling, and GaMnAs","Spintronics has attracted wide attention by promising novel functionalities
+derived from both the electron charge and spin. While branching into new areas
+and creating new themes over the past years, the principal goals remain the
+spin and magnetic control of the electrical properties, essentially the I-V
+characteristics, and vice versa. There are great challenges ahead to meet these
+goals. One challenge is to find niche applications for ferromagnetic
+semiconductors, such as GaMnAs. Another is to develop further the science of
+hybrid ferromagnetic metal/semiconductor heterostructures, as alternatives to
+all-semiconductor room temperature spintronics. Here we present our
+representative recent efiorts to address such challenges. We show how to make a
+digital magnetoresistor by combining two magnetic resonant diodes, or how
+introducing ferromagnetic semiconductors as active regions in resonant
+tunneling diodes leads to novel efiects of digital magnetoresistance and of
+magnetoelectric current oscillations. We also discuss the phenomenon of
+tunneling anisotropic magnetoresistance in Fe/GaAs junctions by introducing the
+concept of the spin-orbit coupling field, as an analog of such fields in
+all-semiconductor junctions. Finally, we look at fundamental electronic and
+optical properties of GaMnAs by employing reasonable tight-binding models to
+study disorder efiects.",0811.0500v1
+2012-03-13,Electronic and magnetic properties of molecule-metal interfaces: transition metal phthalocyanines adsorbed on Ag(100),"We present a systematic investigation of molecule-metal interactions for
+transition-metal phthalocyanines (TMPc, with TM = Fe, Co, Ni, Cu) adsorbed on
+Ag(100). Scanning tunneling spectroscopy and density functional theory provide
+insight into the charge transfer and hybridization mechanisms of TMPc as a
+function of increasing occupancy of the 3d metal states. We show that all four
+TMPc receive approximately one electron from the substrate. Charge transfer
+occurs from the substrate to the molecules, inducing a charge reorganization in
+FePc and CoPc, while adding one electron to ligand \pi-orbitals in NiPc and
+CuPc. This has opposite consequences on the molecular magnetic moment: in FePc
+and CoPc the interaction with the substrate tends to reduce the TM spin,
+whereas in NiPc and CuPc an additional spin is induced on the aromatic Pc
+ligand, leaving the TM spin unperturbed. In CuPc, the presence of both TM and
+ligand spins leads to a triplet ground state arising from intramolecular
+exchange coupling between d and \pi electrons. In FePc and CoPc the magnetic
+moment of C and N atoms is antiparallel to that of the TM. The different
+character and symmetry of the frontier orbitals in the TMPc series leads to
+varying degrees of hybridization and correlation effects, ranging from the
+mixed-valence (FePc, CoPc) to the Kondo regime (NiPc, CuPc). Coherent coupling
+between Kondo and inelastic excitations induces finite-bias Kondo resonances
+involving vibrational transitions in both NiPc and CuPc and triplet-singlet
+transitions in CuPc.",1203.2747v1
+2012-12-21,Correlated Topological Phases and Exotic Magnetism with Ultracold Fermions,"Motivated by the recent progress in engineering artificial non-Abelian gauge
+fields for ultracold fermions in optical lattices, we investigate the
+time-reversal-invariant Hofstadter-Hubbard model. We include an additional
+staggered lattice potential and an artificial Rashba--type spin-orbit coupling
+term available in experiment. Without interactions, the system can be either a
+(semi)-metal, a normal or a topological insulator, and we present the
+non-Abelian generalization of the Hofstadter butterfly. Using a combination of
+real-space dynamical mean-field theory (RDMFT), analytical arguments, and
+Monte-Carlo simulations we study the effect of strong on-site interactions. We
+determine the interacting phase diagram, and discuss a scenario of an
+interaction-induced transition from normal to topological insulator. At
+half-filling and large interactions, the system is described by a quantum spin
+Hamiltonian, which exhibits exotic magnetic order due to the interplay of
+Rashba--type spin-orbit coupling and the artificial time-reversal-invariant
+magnetic field term. We determine the magnetic phase diagram: both for the
+itinerant model using RDMFT and for the corresponding spin model in the
+classical limit using Monte-Carlo simulations.",1212.5607v2
+2013-07-29,Two-orbital physics of high spin fermionic alkaline earth atoms confined in a one-dimensional chain,"We study the effect of the coupling between the electronic ground state of
+high spin alkaline-earth fermionic atoms and their metastable optically excited
+state, when the system is confined in a one-dimensional chain, and show that
+the system provides a possible realization of a finite momentum pairing
+(Fulde-Ferrell-Larkin-Ovchinnikov-like) state without spin- or bare mass
+imbalance. We determine the $\beta$-functions of the renormalization group
+trajectories for general spin and analyze the structure of the possible gapped
+and gapless states in the hydrodynamic limit. Due to the SU(N) symmetry in the
+spin space, complete mode separation can not be observed even in the fully
+gapless 2N-component Luttinger liquid state. Contrary, 4 velocities
+characterize the system. We solve the renormalization group equations for
+spin-9/2 strontium-87 isotope and analyze in detail its phase diagram. The
+fully gapless Luttinger liquid state does not stabilize in the two-orbital
+system of the $^{87}$Sr atoms, instead, different gapped non-Gaussian fixed
+points are identified either with dominant density or superconducting
+fluctuations. The superconducting states are stable in a nontrivial shaped
+region in the parameter space as a consequence of the coupling between the two
+electronic states.",1307.7558v2
+2014-08-13,Topological Floquet states on a Möbius band irradiated by circularly polarised light,"Topological states of matter in equilibrium, as well as out of equilibrium,
+have been thoroughly investigated during the last years in condensed-matter and
+cold-atom systems. However, the geometric topology of the studied samples is
+usually trivial, such as a ribbon or a cylinder. In this paper, we consider a
+graphene M\""obius band irradiated with circularly polarised light.
+Interestingly, due to the non-orientability of the M\""obius band, a homogeneous
+quantum Hall effect cannot exist in this system, but the quantum spin Hall
+effect can. To avoid this restriction, the irradiation is applied in a
+longitudinal-domain-wall configuration. In this way, the periodic
+time-dependent driving term tends to generate the quantum anomalous Hall
+effect. On the other hand, due to the bent geometry of the M\""obius band, we
+expect a strong spin-orbit coupling, which may lead to quantum spin Hall-like
+topological states. Here, we investigate the competition between these two
+phenomena upon varying the amplitude and the frequency of the light, for a
+fixed value of the spin-orbit coupling strength. The topological properties are
+analysed by identifying the edge states in the Floquet spectrum at intermediate
+frequencies, when there are resonances between the light frequency and the
+energy difference between the conduction and valence bands of the graphene
+system.",1408.3087v1
+2016-04-18,Numerical study of the giant nonlocal resistance in spin-orbital coupled graphene,"Recent experiments find the signal of giant nonlocal resistance $R_{NL}$ in
+H-shaped graphene samples due to the spin/valley Hall effect. Interestingly,
+when the Fermi energy deviates from the Dirac point, $R_{NL}$ decreases to zero
+much more rapidly compared with the local resistance $R_L$, and the well-known
+relation of $R_{NL}\propto R_L^3$ is not satisfied. In this work, based on the
+non-equilibrium Green's function method, we explain such transport phenomena in
+the H-shaped graphene with Rashba spin-orbit coupling. When the Fermi energy is
+near the Dirac point, the nonlocal resistance is considerably large and is much
+sharper than the local one. Moreover, the relationship between the Rashba
+effect and the fast decay of $R_{NL}$ compared with $R_L$ is further
+investigated. We find that the Rashba effect does not contribute not only to
+the fast decay but also to the peak of $R_{NL}$ itself. Actually, it is the
+extremely small density of states near the Dirac point that leads to the large
+peak of $R_{NL}$, while the fast decay results from the quasi-ballistic
+mechanism. Finally, we revise the classic formula $R_{NL}\propto R_L^3$ by
+replacing $R_{NL}$ with $R_{Hall}$, which represents the nonlocal resistance
+merely caused by the spin Hall effect, and the relation holds well.",1604.04993v2
+2016-09-01,Microwave spectroscopy of spinful Andreev bound states in ballistic semiconductor Josephson junctions,"The superconducting proximity effect in semiconductor nanowires has recently
+enabled the study of new superconducting architectures, such as gate-tunable
+superconducting qubits and multiterminal Josephson junctions. As opposed to
+their metallic counterparts, the electron density in semiconductor nanosystems
+is tunable by external electrostatic gates providing a highly scalable and
+in-situ variation of the device properties. In addition, semiconductors with
+large $g$-factor and spin-orbit coupling have been shown to give rise to exotic
+phenomena in superconductivity, such as $\varphi_0$ Josephson junctions and the
+emergence of Majorana bound states. Here, we report microwave spectroscopy
+measurements that directly reveal the presence of Andreev bound states (ABS) in
+ballistic semiconductor channels. We show that the measured ABS spectra are the
+result of transport channels with gate-tunable, high transmission probabilities
+up to $0.9$, which is required for gate-tunable Andreev qubits and beneficial
+for braiding schemes of Majorana states. For the first time, we detect
+excitations of a spin-split pair of ABS and observe symmetry-broken ABS, a
+direct consequence of the spin-orbit coupling in the semiconductor.",1609.00333v2
+2016-09-19,Superconductivity and spin-orbit coupling in non-centrosymmetric materials: a review,"In non-centrosymmetric superconductors, where the crystal structure lacks a
+centre of inversion, parity is no longer a good quantum number and an
+electronic antisymmetric spin-orbit coupling (ASOC) is allowed to exist by
+symmetry. If this ASOC is sufficiently large, it has profound consequences on
+the superconducting state. For example, it generally leads to a superconducting
+pairing state which is a mixture of spin-singlet and spin-triplet components.
+The possibility of such novel pairing states, as well as the potential for
+observing a variety of unusual behaviours, led to intensive theoretical and
+experimental investigations. Here we review the experimental and theoretical
+results for superconducting systems lacking inversion symmetry. Firstly we give
+a conceptual overview of the key theoretical results. We then review the
+experimental properties of both strongly and weakly correlated bulk materials,
+as well as two dimensional systems. Here the focus is on evaluating the effect
+of ASOC on the superconducting properties and the extent to which there is
+evidence for singlet-triplet mixing. This is followed by a more detailed
+overview of theoretical aspects of non-centrosymmetric superconductivity. This
+includes the effects of the ASOC on the pairing symmetry and the
+superconducting magnetic response, magneto-electric effects, superconducting
+finite momentum pairing states, and the potential of non-centrosymmetric
+superconductors to display topological superconductivity.",1609.05953v1
+2017-08-08,Gate tunable spin-orbit coupling and weak antilocalization effect in an epitaxial La$_{2/3}$Sr$_{1/3}$MnO$_3$ thin film,"Epitaxial La$_{2/3}$Sr$_{1/3}$MnO$_3$ (LSMO) films have been grown on
+SrTiO$_3$ (001) substrates via pulsed laser deposition. In a 22-nm thick LSMO
+film with a low residual resistivity of $\rho_0$ = 59 $\mu \Omega$ cm, we found
+a zero-field dip in the magnetoresistance (MR) below 10 K, manifesting the weak
+antilocalization (WAL) effect due to strong spin-orbit coupling (SOC). We have
+analyzed the MR data by including the D'yakonov-Perel' spin-relaxation
+mechanism in the WAL theory. We explain that the delocalized spin-down electron
+subband states play a crucial role for facilitating marked SOC in clean LSMO.
+Moreover, we find that the SOC strength and gate voltage tunability is similar
+to that in the 2DEG at LaAlO$_3$/SrTiO$_3$ interface, indicating the presence
+of an internal electric field near the LSMO/SrTiO$_3$ interface. In a control
+measurement on a 5-nm thick high resistivity ($\rho_0$ = 280 $\mu \Omega$ cm)
+LSMO film, we observe only a small zero-field peak in MR from weak localization
+effect, indicating negligible SOC.",1708.02338v1
+2017-08-15,Transport properties of Co in Cu(100) from first principles,"The electronic transport properties of a point-contact system formed by a
+single Co atom adsorbed on Cu (100) and contacted by a copper tip is evaluated
+in the presence of intra-atomic Coulomb interactions and spin-orbit coupling.
+The calculations are performed using equilibrium Green's functions evaluated
+within density functional theory completed with a Hubbard $U$ term and
+spin-orbit interaction, as implemented in the Gollum package. We show that the
+contribution to the transmission between electrodes of spin-flip components is
+negative and scaling as $\lambda^2/\Gamma^2$ where $\lambda$ is the SOC and
+$\Gamma$ the Co atom-electrode coupling. Hence, due to this unfavorable ratio,
+SOC effects in transport in this system are small. However, we show that the
+spin-flip transmission component can increase by two orders of magnitude
+depending on the value of the Hubbard $U$ term. These effects are particularly
+important in the contact regime because of the prevalence of $d$-electron
+transport, while in the tunneling regime, transport is controlled by the
+$sp$-electron transmission and results are less dependent on the values of $U$
+and SOC. Using our electronic structure and the elastic transmission
+calculations, we discuss the effect of $U$ and SOC on the well-known Kondo
+effect of this system.",1708.04472v1
+2012-01-02,Microscopic theory of quantum anomalous Hall effect in graphene,"We present a microscopic theory to give a physical picture of the formation
+of quantum anomalous Hall (QAH) effect in graphene due to a joint effect of
+Rashba spin-orbit coupling $\lambda_R$ and exchange field $M$. Based on a
+continuum model at valley $K$ or $K'$, we show that there exist two distinct
+physical origins of QAH effect at two different limits. For $M/\lambda_R\gg1$,
+the quantization of Hall conductance in the absence of Landau-level
+quantization can be regarded as a summation of the topological charges carried
+by Skyrmions from real spin textures and Merons from \emph{AB} sublattice
+pseudo-spin textures; while for $\lambda_R/M\gg1$, the four-band low-energy
+model Hamiltonian is reduced to a two-band extended Haldane's model, giving
+rise to a nonzero Chern number $\mathcal{C}=1$ at either $K$ or $K'$. In the
+presence of staggered \emph{AB} sublattice potential $U$, a topological phase
+transition occurs at $U=M$ from a QAH phase to a quantum valley-Hall phase. We
+further find that the band gap responses at $K$ and $K'$ are different when
+$\lambda_R$, $M$, and $U$ are simultaneously considered. We also show that the
+QAH phase is robust against weak intrinsic spin-orbit coupling $\lambda_{SO}$,
+and it transitions a trivial phase when
+$\lambda_{SO}>(\sqrt{M^2+\lambda^2_R}+M)/2$. Moreover, we use a tight-binding
+model to reproduce the ab-initio method obtained band structures through doping
+magnetic atoms on $3\times3$ and $4\times4$ supercells of graphene, and explain
+the physical mechanisms of opening a nontrivial bulk gap to realize the QAH
+effect in different supercells of graphene.",1201.0543v1
+2019-10-08,Correlated fluctuations in spin orbit torque-coupled perpendicular nanomagnets,"Low barrier nanomagnets have attracted a lot of research interest for their
+use as sources of high quality true random number generation. More recently,
+low barrier nanomagnets with tunable output have been shown to be a natural
+hardware platform for unconventional computing paradigms such as probabilistic
+spin logic. Efficient generation and tunability of high quality random bits is
+critical for these novel applications. However, current spintronic random
+number generators are based on superparamagnetic tunnel junctions (SMTJs) with
+tunability obtained through spin transfer torque (STT), which unavoidably leads
+to challenges in designing concatenated networks using these two terminal
+devices. The more recent development of utilizing spin orbit torque (SOT)
+allows for a three terminal device design, but can only tune in-plane
+magnetization freely, which is not very energy efficient due to the needs of
+overcoming a large demagnetization field. In this work, we experimentally
+demonstrate for the first time, a stochastic device with perpendicular magnetic
+anisotropy (PMA) that is completely tunable by SOT without the aid of any
+external magnetic field. Our measurements lead us to hypothesize that a tilted
+anisotropy might be responsible for the observed tunability. We carry out
+stochastic Landau-Lifshitz-Gilbert (sLLG) simulations to confirm our
+experimental observation. Finally, we build an electrically coupled network of
+two such stochastic nanomagnet based devices and demonstrate that finite
+correlation or anti-correlation can be established between their output
+fluctuations by a weak interconnection, despite having a large difference in
+their natural fluctuation time scale. Simulations based on a newly developed
+dynamical model for autonomous circuits composed of low barrier nanomagnets
+show close agreement with the experimental results.",1910.03184v1
+2020-01-19,Controlling Dzyaloshinskii-Moriya interactions in the skyrmion host candidates FePd$_{1-x}$Pt$_x$Mo$_3$N,"Ferromagnets crystallizing in structures described by chiral cubic space
+groups, including compounds with the B20 or $\beta$-Mn structures, are known to
+host long-period chiral spin textures such as skyrmion lattices. These spin
+textures are stabilized by a competition between ferromagnetic exchange and
+antisymmetric Dyzaloshinskii-Moriya (DM) exchange, which is enhanced by the
+spin-orbit coupling associated with high-atomic-number elements. For real-world
+application, it is desirable to find materials that can host compact skyrmion
+lattices at readily accessible temperatures. Here, we report on the crystal
+chemistry and magnetic phase diagrams of a family of compounds with the filled
+$\beta$-Mn structure, FePd$_{1-x}$Pt$_x$Mo$_3$N with $T_C$ ranging from 175 K
+to 240 K. DC and AC magnetization measurements reveal magnetic phase diagrams
+consistent with the formation of a skyrmion pocket just below $T_C$. The
+magnitudes of ferromagnetic and DM exchanges are determined from the phase
+diagrams, demonstrating that the introduction of increasing amounts of Pt can
+be used to increase spin-orbit coupling in order to control the expected
+skyrmion lattice parameter between 140 nm and 65 nm while simultaneously
+increasing $T_C$.",2001.06783v1
+2018-06-29,Proximity-induced topological transition and strain-induced charge transfer in graphene/MoS2 bilayer heterostructures,"Graphene/MoS2 heterostructures are formed by combining the nanosheets of
+graphene and monolayer MoS2. The electronic features of both constituent
+monolayers are rather well-preserved in the resultant heterostructure due to
+the weak van der Waals interaction between the layers. However, the proximity
+of MoS2 induces strong spin orbit coupling effect of strength ~1 meV in
+graphene, which is nearly three orders of magnitude larger than the intrinsic
+spin orbit coupling of pristine graphene. This opens a bandgap in graphene and
+further causes anticrossings of the spin-nondegenerate bands near the Dirac
+point. Lattice incommensurate graphene/MoS2 heterostructure exhibits
+interesting moire' patterns which have been observed in experiments. The
+electronic bandstructure of heterostructure is very sensitive to biaxial strain
+and interlayer twist. Although the Dirac cone of graphene remains intact and no
+charge-transfer between graphene and MoS2 layers occurs at ambient conditions,
+a strain-induced charge-transfer can be realized in graphene/MoS2
+heterostructure. Application of a gate voltage reveals the occurrence of a
+topological phase transition in graphene/MoS2 heterostructure. In this chapter,
+we discuss the crystal structure, interlayer effects, electronic structure,
+spin states, and effects due to strain and substrate proximity on the
+electronic properties of graphene/MoS2 heterostructure. We further present an
+overview of the distinct topological quantum phases of graphene/MoS2
+heterostructure and review the recent advancements in this field.",1806.11469v1
+2020-10-26,Topological defects in rotating spin-orbit-coupled dipolar spin-1 Bose-Einstein condensates,"We consider the topological defects and spin structures of spin-1
+Bose-Einstein condensates (BECs) with spin-orbit coupling (SOC) and
+dipole-dipole interaction (DDI) in a rotating harmonic plus quartic trap. The
+combined effects of SOC, DDI and rotation on the ground-state phases of the
+system are analyzed. Our results show that for fixed rotation frequency
+structural phase transitions can be achieved by adjusting the magnitudes of the
+SOC and DDI. A ground-state phase diagram is given as a function of the SOC and
+DDI strengths. It is shown that the system exhibits rich quantum phases
+including vortex string phase with isolated density peaks (DPs), triangular
+(square) vortex lattice phase with DPs, checkerboard phase, and stripe phase
+with hidden vortices and antivortices. For given SOC and DDI strengths, the
+system can display pentagonal vortex lattice with DPs, vortex necklace with
+DPs, and exotic topological structure composed of multi-layer visible vortex
+necklaces, a hidden giant vortex and hidden vortex necklaces, depending on the
+rotation frequency. In addition, the system sustains fascinating novel spin
+textures and skyrmion excitations, such as an antiskyrmion pair,
+antiskyrmion-half-antiskyrmion (antiskyrmion-antimeron) cluster,
+skyrmion-antiskyrmion lattice, skyrmion-antiskyrmion cluster,
+skyrmion-antiskyrmion-meron-antimeron lattice, double-layer half-antiskyrmion
+necklaces, and composite giant-antiskyrmion-antimeron necklaces.",2010.13576v1
+2020-11-05,Strong in-plane magnetic field induced reemergent superconductivity in the van der Waals heterointerface of NbSe2 and CrCl3,"A magnetic field is generally considered to be incompatible with
+superconductivity as it tends to spin-polarize electrons and breaks apart the
+opposite-spin singlet superconducting Cooper pairs. Here, an experimental
+phenomenon is observed that an intriguing reemergent superconductivity evolves
+from a conventional superconductivity undergoing a hump-like intermediate phase
+with a finite electric resistance in the van der Waals heterointerface of
+layered NbSe2 and CrCl3 flakes. This phenomenon merely occurred when the
+applied magnetic field is parallel to the sample plane and perpendicular to the
+electric current direction as compared to the reference sample of a NbSe2 thin
+flake. The strong anisotropy of the reemergent superconducting phase is pointed
+to the nature of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state driven by
+the strong interfacial spin-orbit coupling between NbSe2 and CrCl3 layers. The
+theoretical picture of FFLO state nodes induced by Josephson vortices
+collectively pinning is presented for well understanding the experimental
+observation of the reemergent superconductivity. This finding sheds light on an
+opportunity to search for the exotic FFLO state in the van der Waals
+heterostructures with strong interfacial spin-orbit coupling.",2011.02643v1
+2015-08-02,"Absence of Perfect Conductance Quantization of Helical-edge Transport in Graphene under a Strong, Tilted Magnetic Field","In a recent experiment, Young et al. [Nature {\bf 505}, 528 (2014)] observed
+a metal to insulator transition as well as transport through helical edge
+states in monolayer graphene under a strong, tilted magnetic field. Under such
+conditions, the bulk is a magnetic insulator which can exhibit metallic
+conduction through helical edges. It was found that two-terminal conductance of
+the helical channels deviates from the expected quantized value at
+low-temperatures ($=e^2/h$ per edge, at zero temperature). Motivated by this
+observation, we study the effect of disorder on the conduction through the edge
+channels. We show that, unlike the situation in semiconducting quantum wells, a
+disorder Rashba spin-orbit coupling does not lead to backscattering, at least
+to leading order. Instead we find the lack of perfect anti-alignment of the
+electron spins in the helical channels to be the most likely source for
+backscattering arising from scalar (i.e. spin-independent) impurities. The
+intrinsic spin-orbit coupling and other time-reversal symmetry breaking and/or
+sublattice-parity breaking potentials also lead to (sub-leading) corrections to
+the channel conductance.",1508.00220v2
+2015-08-30,Drumhead Surface States and Topological Nodal-Line Fermions in TlTaSe2,"A topological nodal-line semimetal is a new condensed matter state with
+one-dimensional bulk nodal lines and two-dimensional drumhead surface bands.
+Based on first-principles calculations and our effective k . p model, we
+propose the existence of topological nodal-line fermions in the ternary
+transition- metal chalcogenide TlTaSe2. The noncentrosymmetric structure and
+strong spin-orbit coupling give rise to spinful nodal-line bulk states which
+are protected by a mirror reflection symmetry of this compound. This is
+remarkably distinguished from other proposed nodal-line semimetals such as
+Cu3NPb(Zn) in which nodal lines exist only in the limit of vanishing spin-orbit
+coupling. We show that the drumhead surface states in TlTaSe2, which are
+associated with the topological nodal lines, exhibit an unconventional chiral
+spin texture and an exotic Lifshitz transition as a consequence of the linkage
+among multiple drumhead surface-state pockets.",1508.07521v1
+2016-12-19,Coherent Electron Zitterbewegung,"Zitterbewegung is a striking consequence of relativistic quantum mechanics
+which predicts that free Dirac electrons exhibit a rapid trembling motion even
+in the absence of external forces. The trembling motion of an electron results
+from the interference between the positive and the negative-energy solutions of
+the Dirac equation, separated by one MeV, leading to oscillations at extremely
+high frequencies which are out of reach experimentally. Recently, it was shown
+theoretically that electrons in III-V semiconductors are governed by similar
+equations in the presence of spin-orbit coupling. The small energy splittings
+up to meV result in Zitterbewegung at much smaller frequencies which should be
+experimentally accessible as an AC current. Here, we demonstrate the
+Zitterbewegung of electrons in a solid. We show that coherent electron
+Zitterbewegung can be triggered by initializing an ensemble of electrons in the
+same spin states in strained n-InGaAs and is probed as an AC current at GHz
+frequencies. Its amplitude is shown to increase linearly with both the
+spin-orbit coupling strength and the Larmor frequency of the external magnetic
+field. The latter dependence is the hallmark of the dynamical generation
+mechanism of the oscillatory motion of the Zitterbewegung. Our results
+demonstrate that relativistic quantum mechanics can be studied in a rather
+simple solid state system at moderate temperatures. Furthermore, the large
+amplitude of the AC current at high precession frequencies enables ultra-fast
+spin sensitive electric read-out in solids.",1612.06190v1
+2018-10-15,"Effect of Rashba spin-orbit coupling, magnetization and mixing of gap parameter on tunnelling conductance in F$|$NCSC junction of an F$|$S$|$F spin valve","In this paper, we study the quantum transport at the
+Ferromagnet$|$Noncentrosymmetric Superconductor (F$|$NCSC) interface of an
+F$|$S$|$F spin valve. In this context, we investigate the tunneling conductance
+and its dependence on Rashba Spin-Orbit Coupling (RSOC) considering different
+barrier strength and a significant Fermi Wave-vector Mismatch (FWM) at the
+ferromagnetic and superconducting regions. The study is carried out for
+different magnetization orientations and its strength. We developed Bogoliubov
+de Gennes (BdG) Hamiltonian introducing RSOC and exchange interaction for such
+an hybrid structure. To study charge conductance we use an extended Blonder -
+Tinkham - Klapwijk (BTK) approach along with scattering matrix formalism to
+calculate the scattering coefficients. Our results strongly suggest that the
+tunneling conductance is strongly dependent on RSOC, magnetization strength,
+its orientation and the FWM. The work has also been done for different
+singlet-triplet mixing of the gap parameter. We have observed that with the
+rise of singlet-triplet mixing ratio the conductance decreases. It is also
+observed that a transparent barrier with moderate RSOC and having moderate
+magnetization strength with arbitrary orientation is highly suitable for
+maximum conductance.",1810.06261v1
+2019-05-12,Knight Shift and Leading Superconducting Instability From Spin Fluctuations in Sr2RuO4,"Recent nuclear magnetic resonance studies [A. Pustogow {\it et al.},
+arXiv:1904.00047] have challenged the prevalent chiral triplet pairing scenario
+proposed for Sr$_2$RuO$_4$. To provide guidance from microscopic theory as to
+which other pair states might be compatible with the new data, we perform a
+detailed theoretical study of spin-fluctuation mediated pairing for this
+compound. We map out the phase diagram as a function of spin-orbit coupling,
+interaction parameters, and band-structure properties over physically
+reasonable ranges, comparing when possible with photoemission and inelastic
+neutron scattering data information. We find that even-parity pseudospin
+singlet solutions dominate large regions of the phase diagram, but in certain
+regimes spin-orbit coupling favors a near-nodal odd-parity triplet
+superconducting state, which is either helical or chiral depending on the
+proximity of the $\gamma$ band to the van Hove points. A surprising
+near-degeneracy of the nodal $s^\prime$- and $d_{x^2-y^2}$-wave solutions leads
+to the possibility of a near-nodal time-reversal symmetry broken
+$s^\prime+id_{x^2-y^2}$ pair state. Predictions for the temperature dependence
+of the Knight shift for fields in and out of plane are presented for all
+states.",1905.04782v1
+2022-12-05,Topological superconductivity driven by correlations and linear defects in multiband superconductors,"There have been several proposals for platforms sustaining topological
+superconductivity in high temperature superconductors, in order to make use of
+the larger superconducting gap and the expected robustness of Majorana zero
+modes towards perturbations. In particular, the iron-based materials offer
+relatively large $T_c$ and nodeless energy gaps. In addition, atomically flat
+surfaces enable the engineering of defect structures and the subsequent
+measurement of spectroscopic properties to reveal topological aspects. From a
+theory perspective, a materials-specific description is challenging due to the
+correlated nature of the materials and complications arising from the multiband
+nature of the electronic structure. Here we include both aspects in realistic
+interacting models, and find that the correlations themselves can lead to local
+magnetic order close to linear potential scattering defects at the surface of
+the superconductor. Using a self-consistent Bogoliubov-de Gennes framework in a
+real-space setup using a prototype electronic structure, we allow for arbitrary
+magnetic orders and show how a topological superconducting state emerges. The
+calculation of the topological invariant and the topological gap allows us to
+map out the phase diagram for the case of a linear chain of potential
+scatterers. While intrinsic spin-orbit coupling is not needed to enter the
+topological state in presence of spin-spiral states, it enlarges the
+topological phase. We discuss the interplay of a triplet component of the
+superconducting order parameter and the spin spiral leading effectively to
+extended spin orbit coupling terms, and connect our results to experimental
+efforts on the Fe(Se,Te) system.",2212.02394v1
+2023-01-15,Metastable supersolid in spin-orbit coupled Bose-Einstein condensates,"Supersolid is a special state of matter with both superfluid properties and
+spontaneous modulation of particle density. In this paper, we focus on the
+supersolid stripe phase realized in a spin-orbit coupled Bose-Einstein
+condensate and explore the properties of a class of metastable supersolids. In
+particular, we study a one-dimensional supersolid whose characteristic wave
+number $k$ (magnitude of wave vector) deviates from $k_{m}$, i.e., the one at
+ground state. In other words, the period of density modulation is shorter or
+longer than the one at ground state. We find that this class of supersolids can
+still be stable if their wave numbers fall in the range $k_{c1}<k<k_{c2}$, with
+two thresholds $k_{c1}$ and $k_{c2}$. Stripes with $k$ outside this range
+suffer from dynamical instability with complex Bogoliubov excitation spectrum
+at long wavelength. Experimentally, these stripes with $k$ away from $k_m$ are
+accessible by exciting the longitudinal spin dipole mode, resulting in temporal
+oscillation of stripe period as well as $k$. Within the mean-field
+Gross-Pitaevskii theory, we numerically confirm that for a large enough
+amplitude of spin dipole oscillation, the stripe states become unstable through
+breaking periodicity, in qualitative agreement with the existence of thresholds
+of $k$ for stable stripes. Our work extends the concept of supersolid and
+uncovers a new class of metastable supersolids to explore.",2301.06094v1
+2023-03-02,Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe$_2$,"Van der Waals interactions with transition metal dichalcogenides was shown to
+induce strong spin-orbit coupling (SOC) in graphene, offering great promises to
+combine large experimental flexibility of graphene with unique tuning
+capabilities of the SOC that can rotate spin by moving electrons or vice versa.
+Here, we probe SOC-driven band splitting and electron dynamics in graphene on
+WSe$_2$ by measuring ballistic transverse magnetic focusing. We found a clear
+splitting in the first focusing peak whose evolution in charge density and
+magnetic field is well reproduced by calculations using SOC strength of ~13 meV
+and no splitting in the second peak that indicates stronger Rashba SOC. A
+possible suppression of electron-electron scatterings was also found in
+temperature dependence measurement. Further, we found that Shubnikov-de Haas
+oscillations exhibit SOC strength of ~3.4 meV, suggesting that it probes
+different electron dynamics, calling for new theory. Our study demonstrates an
+interesting possibility to exploit ballistic electron motion pronounced in
+graphene for emerging spin-orbitronics.",2303.01018v2
+2023-08-31,Nature of the mixed-parity pairing of attractive fermions with spin-orbit coupling in optical lattice,"The admixture of spin-singlet and spin-triplet pairing states in
+superconductors can be typically induced by breaking spatial inversion
+symmetry. Employing the {\it numerically exact} auxiliary-field Quantum Monte
+Carlo method, we study such mixed-parity pairing phenomena of attractive
+fermions with Rashba spin-orbit coupling (SOC) in two-dimensional optical
+lattice at finite temperature. We systematically demystify the evolution of the
+essential pairing structure in both singlet and triplet channels versus the
+temperature, fermion filling, SOC and interaction strengths, via computing the
+condensate fraction and pair wave function. Our numerical results reveal that
+the singlet channel dominates in the fermion pairing and the triplet pairing
+has relatively small contribution to the superfluidity for physically relevant
+parameters. In contrast to the singlet channel mainly consisted of the on-site
+Cooper pairs, the triplet pairing has plentiful patterns in real space with the
+largest contributions from several nearest neighbors. As the SOC strengh
+increases, the pairing correlation is firstly enhanced and then suppressed for
+triplet pairing while it's simply weakened in singlet channel. We have also
+obtained the Berezinskii-Kosterlitz-Thouless transition temperatures through
+the finite-size analysis of condensate fraction. Our results can serve as
+quantitative guide for future optical lattice experiments as well as accurate
+benchmarks for theories and other numerical methods.",2308.16657v2
+2023-10-17,Low-energy electronic interactions in ferrimagnetic Sr2CrReO6 thin films,"We reveal in this study the fundamental low-energy landscape in the
+ferrimagnetic Sr2CrReO6 double perovskite and describe the underlying
+mechanisms responsible for the three low-energy excitations below 1.4 eV. Based
+on resonant inelastic x-ray scattering and magnetic dynamics calculations, and
+experiments collected from both Sr2CrReO6 powders and epitaxially strained thin
+films, we reveal a strong competition between spin-orbit coupling, Hund's
+coupling, and the strain-induced tetragonal crystal field. We also demonstrate
+that a spin-flip process is at the origin of the lowest excitation at 200 meV,
+and we bring insights into the predicted presence of orbital ordering in this
+material. We study the nature of the magnons through a combination of ab initio
+and spin-wave theory calculations, and show that two nondegenerate magnon bands
+exist and are dominated either by rhenium or chromium spins. The rhenium band
+is found to be flat at about 200 meV ($\pm$25 meV) through X-L-W-U
+high-symmetry points and is dispersive toward $\Gamma$",2310.11585v1
+2024-02-07,Nodal fermions in a strongly spin-orbit coupled frustrated pyrochlore superconductor,"The pyrochlore lattice, a three-dimensional network of corner-sharing
+tetrahedra, is a promising material playground for correlated topological
+phases arising from the interplay between spin-orbit coupling (SOC) and
+electron-electron interactions. Due to its geometrically frustrated lattice
+structure, exotic correlated states on the pyrochlore lattice have been
+extensively studied using various spin Hamiltonians in the localized limit. On
+the other hand, the topological properties of the electronic structure in the
+pyrochlore lattice have rarely been explored, due to the scarcity of pyrochlore
+materials in the itinerant paramagnetic limit. Here, we explore the topological
+electronic band structure of pyrochlore superconductor RbBi$_{2}$ using
+angle-resolved photoemission spectroscopy. Thanks to the strong SOC of the Bi
+pyrochlore network, we experimentally confirm the existence of
+three-dimensional (3D) massless Dirac fermions enforced by nonsymmorphic
+symmetry, as well as a 3D quadratic band crossing protected by cubic
+crystalline symmetry. Furthermore, we identify an additional 3D linear Dirac
+dispersion associated with band inversion protected by threefold rotation
+symmetry. These observations reveal the rich non-trivial band topology of
+itinerant pyrochlore lattice systems in the strong SOC regime. Through
+manipulation of electron correlations and SOC of the frustrated pyrochlore
+lattices, this material platform is a natural host for exotic phases of matter,
+including the fractionalized quantum spin Hall effect in the topological Mott
+insulator phase, as well as axion electrodynamics in the axion insulator phase.",2402.04509v1
+2024-02-20,Magnetotransport Signatures of the Radial Rashba Spin-Orbit Coupling in Proximitized Graphene,"Graphene-based van der Waals heterostructures take advantage of tailoring
+spin-orbit coupling (SOC) in the graphene layer by proximity effect. At
+long-wavelength -- saddled by the electronic states near the Dirac points --
+the proximitized features can be effectively modelled by the Hamiltonian
+involving novel SOC terms and allow for an admixture of the tangential and
+radial spin textures -- by the so-called Rashba angle $\theta_{\text{R}}$.
+Taking such effective models we perform realistic large-scale magneto-transport
+calculations -- transverse magnetic focusing and Dyakonov-Perel spin relaxation
+-- and show that there are unique qualitative and quantitative features
+allowing for an unbiased experimental disentanglement of the conventional
+Rashba SOC from its novel radial counterpart, called here the radial Rashba
+SOC. Along with that, we propose a scheme for a direct estimation of the Rashba
+angle by exploring the magneto-response symmetries when swapping an in-plane
+magnetic field. To complete the story, we analyze the magneto-transport
+signatures in the presence of an emergent Dresselhaus SOC and also provide some
+generic ramifications about possible scenarios of the radial superconducting
+diode effect.",2402.13424v1
+2003-06-20,Pure spin currents and associated electrical voltage,"We present a generalize Landauer-B\""uttiker transport theory for
+multi-terminal spin transport in presence of spin-orbit interaction. It is
+pointed out that the presence of spin-orbit interaction results in {\it
+equilibrium spin currents}, since in presence of spin-orbit interaction spin is
+not a conserved quantitative. Further we illustrate the theory by applying it
+to a three terminal Y-shaped conductor. It is shown that when one of the
+terminal is a potential probe, there exist {\it nonequilibrium pure spin
+currents} without a n accompanying charge current. It is shown that this pure
+spin currents causes a voltage drop which can be measured if the potential
+probe is ferromagnetic.",0306526v1
+2008-01-16,Charge and Spin Currents Generated by Dynamical Spins,"We demonstrate theoretically that a charge current and a spin current are
+generated by spin dynamics in the presence of spin-orbit interaction in the
+perturbative regime. We consider a general spin-orbit interaction including the
+spatially inhomogeneous case. Spin current due to spin damping is identified as
+one origin of generated charge current, but other contributions exist, such as
+the one due to an induced conservative field and the one arising from the
+inhomogeneity of spin-orbit interaction.",0801.2466v2
+2015-04-25,Ab initio spin-flip conductance of hydrogenated graphene nanoribbons: Spin-orbit interaction and scattering with local impurity spins,"We calculate the spin-dependent zero-bias conductance $G_{\sigma\sigma'}$ in
+armchair graphene nanoribbons with hydrogen adsorbates employing a DFT-based ab
+initio transport formalism including spin-orbit interaction. We find that the
+spin-flip conductance $G_{\sigma\bar{\sigma}}$ can reach the same order of
+magnitude as the spin-conserving one, $G_{\sigma\sigma}$, due to
+exchange-mediated spin scattering. In contrast, the genuine spin-orbit
+interaction appears to play a secondary role, only.",1504.06720v1
+2019-04-10,Enhancement of spin transparency by interfacial alloying,"We report that atomic-layer alloying (intermixing) at a Pt/Co interface can
+increase, by approximately 30%, rather than degrade the interfacial spin
+transparency, and thereby strengthen the efficiency of the dampinglike
+spin-orbit torque arising from the spin Hall effect in the Pt. At the same
+time, this interfacial alloying substantially reduces fieldlike spin-orbit
+torque. Insertion of an ultrathin magnetic alloy layer at
+heavy-metal/ferromagnet interfaces represents an effective approach for
+improving interfacial spin transparency that may enhance not only spin-orbit
+torques but also the spin detection efficiency in inverse spin Hall
+experiments.",1904.05455v1
+2014-04-01,Magnetic states of the five-orbital Hubbard model for one-dimensional iron-based superconductors,"The magnetic phase diagrams of models for quasi one-dimensional compounds
+belonging to the iron-based superconductors family are presented. The
+five-orbital Hubbard model and the real-space Hartree-Fock approximation are
+employed, supplemented by density functional theory to obtain the hopping
+amplitudes. Phase diagrams are constructed varying the Hubbard $U$ and Hund $J$
+couplings and at zero temperature. The study is carried out at electronic
+density (electrons per iron) $n = 5.0$, which is of relevance for the already
+known material TlFeSe$_2$, and also at $n = 6.0$, where representative
+compounds still need to be synthesized. At $n = 5.0$ there is a clear dominance
+of staggered spin order along the chain direction. At $n = 6.0$ and the
+realistic Hund coupling $J/U = 0.25$, the phase diagram is far richer including
+a variety of ``block'' states involving ferromagnetic clusters that are
+antiferromagnetically coupled, in qualitative agreement with recent Density
+Matrix Renormalization Group calculations for the three-orbital Hubbard model
+in a different context. These block states arise from the competition between
+ferromagnetic order (induced by double exchange, and prevailing at large $J/U$)
+and antiferromagnetic order (dominating at small $J/U$). The density of states
+and orbital compositions of the many phases are also provided.",1404.0069v1
+2019-09-02,Doublon-holon excitations split by Hund's rule coupling within the orbital-selective Mott phase,"Multiorbital interactions have the capacity to produce an interesting kind of
+doublon-holon bound state that consists of a single-hole state in one band and
+a doubly-occupied state in another band. Interband doublon-holon pair
+excitations in the two-orbital Hubbard model are studied by using dynamical
+mean-field theory with the Lanczos method as the impurity solver. We find that
+the interband bound states may provide several in-gap quasiparticle peaks in
+the density of states of the narrow band in the orbital-selective Mott phase
+with a small Hund's rule coupling ($J$). There exists a corresponding energy
+relation between the in-gap states of the narrow band and the peaks in the
+excitation spectrum of the doublon for the wide band. We also find that the
+spin flip and pair-hopping Hund interactions can divide one quasiparticle peak
+into two peaks, where the splitting energy increases linearly with increasing
+$J$. Strong Hund's rule coupling can move the interband doublon-holon pair
+excitations outside the Mott gap and restrict the bound states by suppressing
+the orbital selectivity of the doubly-occupied and single-hole states.",1909.00605v1
+2006-05-15,Orbital Order Instability and Orbital Excitations in Degenerate Itinerant Electron Systems,"We present the theory of orbital ordering in orbital-degenerate itinerant
+electron systems. After proposing the criterion of instability for orbital
+ordering or orbital density wave ordering, we find that the orbital and the
+spin-orbital collective excitation spectra in ferro-orbital ordered phase
+exhibit finite gaps. The anomalous electronic energy spectra manifested in the
+angle-resolved photoemission spectroscopy (ARPES) and the orbital occupation in
+the resonant X-ray scattering (RXS) intensities are also presented for the
+orbital-ordered phase.",0605379v1
+1999-06-25,Sound and Heat Absorption by a 2D Electron Gas in an Odd-Integer Quantized-Hall Regime,"The absorption of bulk acoustic phonons in a two-dimensional (2D) GaAs/AlGaAs
+heterostructure is studied (in the clean limit) where the 2D electron-gas
+(2DEG), being in an odd-integer quantum-Hall state, is in fact a spin
+dielectric. Of the two channels of phonon absorption associated with excitation
+of spin waves, one, which is due to the spin-orbit (SO) coupling of electrons,
+involves a change of the spin state of the system and the other does not. We
+show that the phonon-absorption rate corresponding to the former channel (in
+the paper designated as the second absorption channel) is finite at zero
+temperature ($T$), whereas that corresponding to the latter (designated as the
+first channel) vanishes for $T\to 0$. The long-wavelength limit, being the
+special case of the first absorption channel, corresponds to sound (bulk and
+surface) attenuation by the 2DEG. At the same time, the ballistic phonon
+propagation and heat absorption are determined by both channels. The 2DEG
+overheat and the attendant spin-state change are found under the conditions of
+permanent nonequilibrium phonon pumping.",9906396v3
+2000-10-27,Ground state spin and Coulomb blockade peak motion in chaotic quantum dots,"We investigate experimentally and theoretically the behavior of Coulomb
+blockade (CB) peaks in a magnetic field that couples principally to the
+ground-state spin (rather than the orbital moment) of a chaotic quantum dot. In
+the first part, we discuss numerically observed features in the magnetic field
+dependence of CB peak and spacings that unambiguously identify changes in spin
+S of each ground state for successive numbers of electrons on the dot, N. We
+next evaluate the probability that the ground state of the dot has a particular
+spin S, as a function of the exchange strength, J, and external magnetic field,
+B. In the second part, we describe recent experiments on gate-defined GaAs
+quantum dots in which Coulomb peak motion and spacing are measured as a
+function of in-plane magnetic field, allowing changes in spin between N and N+1
+electron ground states to be inferred.",0010441v1
+2002-07-08,Static and Dynamical Dzyaloshinsky-Moriya interactions in gapped spin systems,"Anisotropic spin-spin interactions of Dzyaloshinsky and Moriya symmetry are
+generally considered weak, as they depend on the spin-orbit couplings. In spin
+systems with gapped ground states they can, however, have rather strong
+effects. We will discuss recent results related to the results of neutron
+scattering and ESR for $\rm SrCu_2(BO_3)_2$. Inclusion of the
+Dzyaloshinsky-Moriya interactions can explain much of the dynamics of the
+systems discussed, in particular the splitting and dispersion of the triplet
+modes. Some effects remain to be explained, however. Symmetries of the crystal
+lead to the prediction of zero intensity for transitions, for example between
+the ground state and the triplets observed in ESR.
+  We present recent calculations of the effects of anisotropic terms generated
+dynamically, ie linearly in the phonon coordinates. We discuss how this leads
+to a novel mechanism to explain the ESR intensities. For polarized neutron
+scattering experiments, we can calculate the mixing of nuclear and magnetic
+scattering amplitudes by such a term and how such mixing should be observed.",0207191v1
+2002-07-16,Probing entanglement via Rashba-induced shot noise oscillations,"We have recently calculated shot noise for entangled and spin-polarized
+electrons in novel beam-splitter geometries with a local Rashba s-o interaction
+in the incoming leads. This interaction allows for a gate-controlled rotation
+of the incoming electron spins. Here we present an alternate simpler route to
+the shot noise calculation in the above work and focus on only electron pairs.
+Shot noise for these shows continuous bunching and antibunching behaviors. In
+addition, entangled and unentangled triplets yield distinctive shot noise
+oscillations. Besides allowing for a direct way to identify triplet and singlet
+states, these oscillations can be used to extract s-o coupling constants
+through noise measurements. Incoming leads with spin-orbit interband mixing
+give rise an additional modulation of the current noise. This extra rotation
+allows the design of a spin transistor with enhanced spin control.",0207392v1
+2002-10-25,Anisotropic and incommensurate spin fluctuations in hcp iron and some other nearly magnetic metals,"We present an ab initio theoretical formalism for the static paramagnetic
+spin susceptibility of metals at finite temperatures. Since relativistic
+effects, e.g. spin-orbit coupling, are included, we can identify the anisotropy
+or easy axes of the spin fluctuations. Our calculations find hcp-iron to be
+unstable to in ab-plane, incommensurate anti-ferromagnetic (AFM) modes (linked
+to nested Fermi surface) below T_N =69K for the lowest pressures under which it
+is stable. T_N swiftly drops to zero as the pressure is increased. The
+calculated susceptibility of yttrium is consistent with the helical,
+incommensurate AFM order found in many rare-earth-dilute yttrium alloys.
+Lastly, in line with experimental data, we find the easy axes of the
+incommensurate AFM and ferromagnetic spin fluctuations of the normal state of
+the triplet superconductor Sr2RuO4 to be perpendicular and parallel with the
+crystal c-axis resepctively.",0210581v1
+2002-11-25,Spin Current Generation and Detection in the Presence of AC Gate,"We predict that in a narrow gap III-V semiconductor quantum well or a wire an
+observable spin current can be generated with a time dependent gate to modify
+the Rashba spin-orbit coupling constant. Methods to rectify the so generated AC
+current are discussed. An all-electric method of spin current detection is
+suggested, which measures the voltage on the gate in the vicinity of a 2D
+electron gas carrying a time dependent spin current. Both the generation and
+detection do not involve any optical or magnetic mediators.",0211559v2
+2002-11-26,Non-ballistic spin field-effect transistor,"We propose a spin field-effect transistor based on spin-orbit (s-o) coupling
+of both the Rashba and the Dresselhaus types. Differently from earlier
+proposals, spin transport through our device is tolerant against
+spin-independent scattering processes. Hence the requirement of strictly
+ballistic transport can be relaxed. This follows from a unique interplay
+between the Dresselhaus and the (gate-controlled) Rashba interactions; these
+can be tuned to have equal strengths thus yielding k-independent eigenspinors
+even in two dimensions. We discuss implementations with two-dimensional devices
+and quantum wires. In the latter, our setup presents strictly parabolic
+dispersions which avoids complications arising from anticrossings of different
+bands.",0211603v2
+2003-04-24,Shot noise of spin polarized electrons,"The shot noise of spin polarized electrons is shown to be generically
+dependent upon spin-flip processes. Such a situation represents perhaps the
+simplest instance where the two-particle character of current fluctuations out
+of equilibrium is explicit, leading to trinomial statistics of charge transfer
+in a single channel model. We calculate the effect of spin-orbit coupling,
+magnetic impurities, and precession in an external magnetic field on the noise
+in the experimentally relevant cases of diffusive wires and lateral
+semiconductor dots, finding dramatic enhancements of the Fano factor. The
+possibility of using the shot noise to measure the spin-relaxation time in an
+open mesoscopic system is raised.",0304544v2
+2003-12-17,Goldstone-Mode Relaxation in a Quantized Hall Ferromagnet in the Presence of Smooth Random Potential,"We discuss the spin relaxation of a strongly correlated two-dimensional (2D)
+electron gas (2DEG) in the quantized Hall regime when the filling factor is
+close to an odd-integer. As the initial state we consider a coherent deviation
+of the spin system from the ${\bf B}$ direction and investigate a break-down of
+this Goldstone-mode state due to the spin-orbit (SO) coupling and smooth
+disorder. The spin relaxation (SR) process is considered in terms of
+annihilation transitions in the system of spin excitons (magnons).",0312427v5
+2004-11-28,The effect of in-plane magnetic field on the spin Hall effect in Rashba-Dresselhaus system,"In a two-dimensional electron gas with Rashba and Dresselhaus spin-orbit
+couplings, there are two spin-split energy surfaces connected with a degenerate
+point. Both the energy surfaces and the topology of the Fermi surfaces can be
+varied by an in-plane magnetic field. We find that, if the chemical potential
+falls between the bottom of the upper band and the degenerate point, then
+simply by changing the direction of the magnetic field, the magnitude of the
+spin Hall conductivity can be varied by about 100 percent. Once the chemical
+potential is above the degenerate point, the spin Hall conductivity becomes the
+constant $e/8\pi$, independent of the magnitude and direction of the magnetic
+field. In addition, we find that the in-plane magnetic field exerts no
+influence on the charge Hall conductivity.",0411697v1
+2005-05-13,Spin-state transition in LaCoO3: direct neutron spectroscopic evidence of excited magnetic states,"A gradual spin-state transition occurs in LaCoO3 around T~80-120 K, whose
+detailed nature remains controversial. We studied this transition by means of
+inelastic neutron scattering (INS), and found that with increasing temperature
+an excitation at ~0.6 meV appears, whose intensity increases with temperature,
+following the bulk magnetization. Within a model including crystal field
+interaction and spin-orbit coupling we interpret this excitation as originating
+from a transition between thermally excited states located about 120 K above
+the ground state. We further discuss the nature of the magnetic excited state
+in terms of intermediate-spin (IS, S=1) vs. high-spin (HS, S=2) states. Since
+the g-factor obtained from the field dependence of the INS is g~3, the second
+interpretation looks more plausible.",0505344v2
+2005-12-02,Spin-Hall effect: Back to the Beginning on a Higher Level,"The phenomena of the spin-Hall effect, initially proposed over three decades
+ago in the context of asymmetric Mott skew scattering, was revived recently by
+the proposal of a possible intrinsic spin-Hall effect originating from a
+strongly spin-orbit coupled band structure. This new proposal has generated an
+extensive debate and controversy over the past two years. The purpose of this
+workshop, held at the Asian Pacific Center for Theoretical Physics, was to
+bring together many of the leading groups in this field to resolve such issues
+and identify future challenges. We offer this short summary to clarify the now
+settled issues on some of the more controversial aspects of the debate and help
+refocus the research efforts in new and important avenues.",0512054v1
+2006-01-17,Electron Correlations and the Minority-Spin Band Gap in Half-Metallic Heusler Alloys,"Electron-electron correlations affect the band gap of half-metallic
+ferromagnets by introducing non-quasiparticle states just above the Fermi
+level. In contrast to the spin-orbit coupling, a large asymmetric
+non-quasiparticle spectral weight is present in the minority-spin channel,
+leading to a peculiar finite-temperature spin depolarization effects. Using
+recently developed first-principle dynamical mean field theory, we investigate
+these effects for the half-metallic ferrimagnetic Heusler compound FeMnSb. We
+discuss depolarization effects in terms of strength of local Coulomb
+interaction $U$ and temperature in FeMnSb. We propose Ni$_{1-x}$Fe$_{x}$MnSb
+alloys as a perspective materials to be used in spin-valve structures and for
+experimental search of non-quasiparticle states in half-metallic materials.",0601376v1
+2006-03-07,Spin-Hall effect in a [110] quantum well,"A self-consistent treatment of the spin-Hall effect requires consideration of
+the spin-orbit coupling and electron-impurity scattering on equal footing. This
+is done here for the experimentally relevant case of a [110] GaAs quantum well
+[Sih {\it et al.}, Nature Physics 1, 31 (2005)]. Working within the framework
+of the exact linear response formalism we calculate the spin-Hall conductivity
+including the Dresselhaus linear and cubic terms in the band structure, as well
+as the electron-impurity scattering and electron-electron interaction to all
+orders. We show that the spin-Hall conductivity naturally separates into two
+contributions, skew-scattering and side-jump, and we propose an experiment to
+distinguish between them.",0603144v3
+2006-06-23,Dynamical spin chirality and spin anisotropy in gapped S=1/2 quantum systems,"We have studied the spin anisotropy in spin-singlet ground state compounds
+and the magnetic chirality, as measured by inelastic polarized neutron
+scattering techniques, in the chain-sublattice of Sr14Cu24O41. In-plane and out
+of plane magnetic fluctuations are measured to be anisotropic and further
+discussed in the light of the current hypothesis of spin-orbit coupling. We
+show that under appropriate conditions of magnetic field and neutron
+polarization, the \textit{trivial} magnetic chirality selects only one of the
+Zeeman splitted triplet states for scattering and erases the other one that
+posses opposite helicity. Our analysis pertains to previous studies on
+dynamical magnetic chirality and chiral critical exponents, where the ground
+state is chiral itself, the so-called \textit{non-trivial} dynamical magnetic
+chirality. As it turns out, both \textit{trivial} and \textit{non-trivial}
+dynamical magnetic chirality have identical selection rules for inelastic
+polarized neutron scattering experiments and it is not at all evident that they
+can be distinguished in a paramagnetic compound.",0606598v1
+2006-10-12,Fermi liquid instabilities in the spin channel,"We study the Fermi surface instabilities of the Pomeranchuk type in the spin
+triplet channel with high orbital partial waves ($F_{l}^a ~(l>0)$). The ordered
+phases are classified into two classes, dubbed the $\alpha$ and $\beta$-phases
+by analogy to the superfluid $^3$He-A and B-phases. The Fermi surfaces in the
+$\alpha$-phases exhibit spontaneous anisotropic distortions, while those in the
+$\beta$-phases remain circular or spherical with topologically non-trivial spin
+configurations in momentum space. In the $\alpha$-phase, the Goldstone modes in
+the density channel exhibit anisotropic overdamping. The Goldstone modes in the
+spin channel have nearly isotropic underdamped dispersion relation at small
+propagating wavevectors. Due to the coupling to the Goldstone modes, the spin
+wave spectrum develops resonance peaks in both the $\alpha$ and $\beta$-phases,
+which can be detected in inelastic neutron scattering experiments. In the
+p-wave channel $\beta$-phase, a chiral ground state inhomogeneity is
+spontaneously generated due to a Lifshitz-like instability in the originally
+nonchiral systems. Possible experiments to detect these phases are discussed.",0610326v2
+2006-12-12,Electric-Field-Induced Resonant Spin Polarization in a Two-Dimensional Electron Gas,"Electric response of spin polarization in two-dimensional electron gas with
+structural inversion asymmetry subjected to a magnetic field was studied by
+means of the linear and non-linear theory and numerical simulation with the
+disorder effect. It was found by Kubo linear reponse theory that an electric
+resonant response of spin polarization occurs when the Fermi surface is located
+near the crossing of two Landau levels, which is induced from the competition
+between the spin-orbit coupling and Zeeman splitting. The scaling behavior was
+investigated with a simplified two-level model by non-linear method, and the
+resonant peak value is reciprocally proportional to the electric field at low
+temperatures and to temperature for finite electric fields. Finally numerical
+simulation illustrated that impurity potential opens an enegy gap near the
+resonant point and suppresses the effect gradually with the increasing strength
+of disorder. This resonant effect may provide an efficient way to control spin
+polarization by an external electric field.",0612277v2
+2007-02-10,Spin-dependent Rotating Wigner Molecules in Quantum dots,"The spin-dependent trial wave functions with rotational symmetry are
+introduced to describe rotating Wigner molecular states with spin degree of
+freedom in four- and five-electron quantum dots under magnetic fields. The
+functions are constructed with unrestricted Hartree-Fock orbits and projection
+technique in long-range interaction limit. They highly overlap with the
+exact-diagonalized ones and give the accurate energies in strong fields. The
+zero points, i.e. vortices of the functions have straightforward relations to
+the angular momenta of the states. The functions with different total spins
+automatically satisfy the angular momentum transition rules with the increase
+of magnetic fields and explicitly show magnetic couplings and characteristic
+oscillations with respect to the angular momenta. Based on the functions, it is
+demonstrated that the entanglement entropies of electrons depend on the
+z-component of total spin and rise with the increase of angular momenta.",0702256v2
+2000-10-04,Gravitational field and equations of motion of spinning compact binaries to 2.5 post-Newtonian order,"We derive spin-orbit coupling effects on the gravitational field and
+equations of motion of compact binaries in the 2.5 post-Newtonian approximation
+to general relativity, one PN order beyond where spin effects first appear. Our
+method is based on that of Blanchet, Faye, and Ponsot, who use a post-Newtonian
+metric valid for general (continuous) fluids and represent pointlike compact
+objects with a delta-function stress-energy tensor, regularizing divergent
+terms by taking the Hadamard finite part. To obtain post-Newtonian spin
+effects, we use a different delta-function stress-energy tensor introduced by
+Bailey and Israel. In a future paper we will use the 2.5PN equations of motion
+for spinning bodies to derive the gravitational-wave luminosity and phase
+evolution of binary inspirals, which will be useful in constructing matched
+filters for signal analysis. The gravitational field derived here may help in
+posing initial data for numerical evolutions of binary black hole mergers.",0010014v1
+2005-12-21,Noncommutative geometry induced by spin effects,"In this paper we study the nonlocal effects of noncommutative spacetime on
+simple physical systems. Our main point is the assumption that the
+noncommutative effects are consequences of a background field which generates a
+local spin structure. So, we reformulate some simple electrostatic models in
+the presence of a spin-deformation contribution to the geometry of the motion,
+and we obtain an interesting correlation amongst the deformed area vector, the
+3D noncommutative effects and the usual spin vector given in quantum mechanics
+framework. Remarkably we can observe that a spin-orbit coupling term comes to
+light on the spatial sector of a potential wrote in terms of noncommutative
+coordinates what indicates that bound states are particular cases in this
+procedure. Concerning to confined or bounded particles in this noncommutative
+domain we verify that the kinetic energy is modified by a deformation factor.
+Finally, we discuss about perspectives.",0512266v1
+2007-04-25,"Charge and spin stripe in La$_{2-x}$Sr$_{x}$NiO$_{4}$ (x=1/3,1/2)","Electronic structure of stripe ordered La$_{2-x}$Sr$_{x}$NiO$_{4}$ is
+investigated. The system with x=1/3 is insulator, in LSDA+U calculations, and
+shows charge and spin stripe, consistent with the experimental results. Highly
+correlated system of x=1/2 is studied by using exact diagonalization of
+multi-orbital many body Hamiltonian derived from LDA calculations and including
+on-site and inter-site Coulomb interactions. The fluctuation of the residual
+spin on Ni$^{3+}$ (hole) site couples with the charge fluctuation between
+Ni$^{3+}$ and Ni$^{2+}$ states and this correlation lowers the total energy.
+The resultant ground state is insulator with charge and spin stripe of the
+energy gap 0.9eV, consistent with observed one. The on-site Coulomb interaction
+stabilizes integral valency of each Ni ion (Ni$^{3+}$ and Ni$^{2+}$), but does
+not induce the charge order. Two quantities, inter-site Coulomb interaction and
+anisotropy of hopping integrals, play an important role to form the charge and
+spin stripe order in a system of x=1/2.",0704.3323v2
+2007-07-24,Intrinsic spin-Hall accumulation in honeycomb lattices: Band structure effects,"Local spin and charge densities on a two-dimensional honeycomb lattice are
+calculated by the Landauer-Keldysh formalism (LKF). Through the empirical
+tight-binding method, we show how the realistic band structure can be brought
+into the LKF. Taking the Bi(111) surface, on which strong surface states and
+Rashba spin-orbit coupling are present [Phys. Rev. Lett. 93, 046403 (2004)], as
+a numeric example, we show typical intrinsic spin-Hall accumulation (ISHA)
+patterns thereon. The Fermi-energy-dependence of the spin and charge transport
+in two-terminal nanostructure samples is subsequently analyzed. By changing
+E_{F}, we show that the ISHA pattern is nearly isotropic (free-electron-like)
+only when E_{F} is close to the band bottom, and is sensitive/insensitive to
+E_{F} for the low/high bias regime with such E_{F}. With E_{F} far from the
+band bottom, band structure effects thus enter the ISHA patterns and the
+transport direction becomes significant.",0707.3626v3
+2007-08-07,Direct measurement of a pure spin current by a polarized light beam,"The photon helicity may be mapped to a spin-1/2, whereby we put forward an
+intrinsic interaction between a polarized light beam as a ``photon spin
+current'' and a pure spin current in a semiconductor, which arises from the
+spin-orbit coupling in valence bands as a pure relativity effect without
+involving the Rashba or the Dresselhaus effect due to inversion asymmetries.
+The interaction leads to circular optical birefringence, which is similar to
+the Faraday rotation in magneto-optics but nevertheless involve no net
+magnetization. The birefringence effect provide a direct, non-demolition
+measurement of pure spin currents.",0708.0881v4
+2008-02-08,Tunneling conductance of a metal-semiconductor heterostructure with Rashba effect,"We theoretically studied the in-plane tunneling spectroscopy of the hybrid
+structure composed of a metal and a semiconductor with Rashba spin-orbit
+coupling. We found that the energy spacing between two distinct features in the
+conductance spectrum can be used to measure the Rashba energy of the
+semiconductor. We also considered the effect that varying the probability of
+spin-conserving and spin-flip scattering at the interface has on the overall
+conductance. Surprisingly, an increase in interface scattering probability can
+actually result in increased conductance under certain conditions.
+Particularly, in the tunneling regime, an increase in spin-flip scattering
+probability enhances the conductance. It is also found that the interfacial
+scattering greatly affects the spin polarization of the conductance in metal,
+but hardly affects that in the semiconductor.",0802.1097v2
+2008-03-05,A Fractionalized Quantum Spin Hall Effect,"Effects of electron correlations on a two dimensional quantum spin Hall (QSH)
+system are studied. We examine possible phases of a generalized Hubbard model
+on a bilayer honeycomb lattice with a spin-orbit coupling and short range
+electron-electron repulsions at half filling, based on the slave rotor
+mean-field theory. Besides the conventional QSH phase and a broken-symmetry
+insulating phase, we find a new phase, a fractionalized quantum spin Hall
+phase, where the QSH effect arises for fractionalized spinons which carry only
+spin but not charge. Experimental manifestations of the exotic phase and
+effects of fluctuations beyond the saddle point approximation are also
+discussed.",0803.0756v3
+2008-04-18,Molecular spin resonance in the geometrically frustrated MgCr2O4 magnet by inelastic neutron scattering,"We measured two magnetic modes with finite and discrete energies in an
+antiferromagnetic ordered phase of a geometrically frustrated magnet MgCr2O4 by
+single-crystal inelastic neutron scattering, and clarified the spatial spin
+correlations of the two levels: one is an antiferromagnetic hexamer and the
+other is an antiferromagnetic heptamer. Since these correlation types are
+emblematic of quasielastic scattering with geometric frustration, our results
+indicate instantaneous suppression of lattice distortion in an ordered phase by
+spin-lattice coupling, probably also supported by orbital and charge. The
+common features in the two levels, intermolecular independence and discreteness
+of energy, suggest that the spin molecules are interpreted as quasiparticles
+(elementary excitations with energy quantum) of highly frustrated spins, in
+analogy with the Fermi liquid approximation.",0804.2993v1
+2008-06-26,Unscreened Coulomb interactions and quantum spin Hall phase in neutral zigzag graphene ribbons,"A study of the effect of unscreened Coulomb interactions on the quantum spin
+Hall (QSH) phase of finite-width neutral zigzag graphene ribbons is presented.
+By solving a tight-binding Hamiltonian that includes the intrinsic spin-orbit
+interaction (I-SO), exact expressions for band-structures and edge-states
+wavefunctions are obtained. These analytic results, supported by tight-binding
+calculations, show that chiral spin-filtered edge states are composed of
+localized and damped oscillatory wavefunctions, reminiscent of the ones
+obtained in armchair ribbons. The addition of long-range Coulomb interactions
+opens a gap in the charge sector with a gapless spin sector. In contrast to
+armchair terminations, the charge-gap vanishes exponentially with the ribbon
+width and its amplitude and decay-length are strongly dependent on the I-SO
+coupling. Comparison with reported ab-initio calculations are presented.",0806.4235v2
+2009-03-13,Perfect spin filtering device through a Mach Zehnder interferometer in GaAs/AlGaAs electron gas,"Spin filtering through quantum spin interference is addressed exactly, in two
+dimensions, in a medium that has both Rashba and Dresselhaus spin-orbit
+couplings and an applied external magnetic field. The problem is addressed from
+the fully non-Abelian Gauge formulation. We propose an experimentally feasible
+electronic Mach Zehnder Interferometer and solve for the perfect spin filtering
+conditions. We find two broad solutions, one where filtering is achieved in the
+original incoming basis, that is purely a non-Abelian solution, and the other
+where one needs a tilted axis to observe the polarized output spinor. The
+latter solution is well approximated by an Abelianized approximation. Both
+solutions apply for arbitrary incoming polarization, and are only limited by
+the randomness of the incoming spinor state.",0903.2468v2
+2009-03-23,Possible origin of the 0.5 plateau in the ballistic conductance of quantum point contacts,"A non-equilibrium Green function formalism (NEGF) is used to study the
+conductance of a side-gated quantum point contact (QPC) in the presence of
+lateral spin-orbit coupling (LSOC). A small difference of bias voltage between
+the two side gates (SGs) leads to an inversion asymmetry in the LSOC between
+the opposite edges of the channel. In single electron modeling of transport,
+this triggers a spontaneous but insignificant spin polarization in the QPC.
+However, the spin polarization of the QPC is enhanced substantially when the
+effect of electron-electron interaction is included. The spin polarization is
+strong enough to result in the occurrence of a conductance plateau at 0.5G0 (G0
+= 2e2/h) in the absence of any external magnetic field. In our simulations of a
+model QPC device, the 0.5 plateau is found to be quite robust and survives up
+to a temperature of 40K. The spontaneous spin polarization and the resulting
+magnetization of the QPC can be reversed by flipping the polarity of the source
+to drain bias or the potential difference between the two SGs. These numerical
+simulations are in good agreement with recent experimental results for
+side-gated QPCs made from the low band gap semiconductor InAs.",0903.3915v2
+2009-04-01,All-electric-spin control in interference single electron transistors,"Single particle interference lies at the heart of quantum mechanics. The
+archetypal double-slit experiment has been repeated with electrons in vacuum up
+to the more massive $C_{60}$ molecules. Mesoscopic rings threaded by a magnetic
+flux provide the solid-state analogous. Intra-molecular interference has been
+recently discussed in molecular junctions. Here we propose to exploit
+interference to achieve all-electrical control of a single electron spin in
+quantum dots, a highly desirable property for spintronics and spin-qubit
+applications. The device consists of an interference single electron transistor
+(ISET), where destructive interference between orbitally degenerate electronic
+states produces current blocking at specific bias voltages. We show that in the
+presence of parallel polarized ferromagnetic leads the interplay between
+interference and the exchange coupling on the system generates an effective
+energy renormalization yielding different blocking biases for majority and
+minority spins. Hence, by tuning the bias voltage full control over the spin of
+the trapped electron is achieved.",0904.0167v1
+2009-07-17,Spin-order driven Fermi surface revealed by quantum oscillations in an underdoped high Tc superconductor,"We use quantum oscillation measurements to distinguish between spin and
+orbital components of the lowest energy quasiparticle excitations in
+YBa2Cu3O6.54, each of which couple differently to a magnetic field. Our
+measurements reveal the phase of the observed quantum oscillations to remain
+uninverted over a wide angular range, indicating that the twofold spin
+degeneracy of the Landau levels is virtually unaltered by the magnetic field.
+The inferred suppression of the spin degrees of freedom indicates a spin
+density-wave is responsible for creation of the small Fermi surface pockets in
+underdoped YBa2Cu3O6+x - further suggesting that excitations of this phase are
+important contributors to the unconventional superconducting pairing mechanism.",0907.2958v1
+2010-04-04,Spin selective transport through Aharonov-Bohm and Aharonov-Casher triple quantum dot systems,"We calculate the conductance through a system of three quantum dots under two
+different sets of conditions that lead to spin filtering effects under an
+applied magnetic field. In one of them, a spin is localized in one quantum dot,
+as proposed by Delgado et al. [Phys. Rev. Lett. 101, 226810 (2008)]. In the
+other one, all dots are equivalent by symmetry and the system is subject to a
+Rashba spin-orbit coupling. We solve the problem using a simple effective
+Hamiltonian for the low-energy subspace, improving the accuracy of previous
+results. We obtain that correlation effects related to the Kondo physics play a
+minor role for parameters estimated previously and high enough magnetic field.
+Both systems lead to a magnetic field tunable ""spin valve"".",1004.0538v2
+2010-04-07,"Comments on ""Spin-dependent tunneling through a symmetric semiconductor barrier: The Dresselhaus effect""","In a recent paper [Phys. Rev. B 72, 153314 (2005)], the $k^{3}$-Dresselhaus
+term in the contacts and the full form of the current operator are considered
+for spin-dependent tunneling through a symmetric barrier. The authors found
+that the full form of the current operator has a much larger influence on the
+spin polarization than it was initially thought. In this Comment we will show
+that their treatment of the other problem, the $k^{3}$-Dresselhaus term in the
+contacts, is incorrect. Their proposed solution in the contacts simply does not
+obey the Schr\""{o}dinger equation. In this context we also comment on the
+definition and the suitability of spin polarization in contacts with spin-orbit
+coupling.",1004.1019v1
+2010-08-30,Relativistic spin-precession in binary pulsars,"After the first prediction to expect geodetic precession in binary pulsars in
+1974, made immediately after the discovery of a pulsar with a companion, the
+effects of relativistic spin precession have now been detected in all binary
+systems where the magnitude of the precession rate is expected to be
+sufficiently high. Moreover, the first quantitative test leads to the only
+available constraints for spin-orbit coupling of a strongly self-gravitating
+body for general relativity (GR) and alternative theories of gravity. The
+current results are consistent with the predictions of GR, proving the
+effacement principle of spinning bodies. Beyond tests of theories of gravity,
+relativistic spin precession has also become a useful tool to perform beam
+tomography of the pulsar emission beam, allowing to infer the unknown beam
+structure, and to probe the physics of the core collapse of massive stars.",1008.5032v1
+2010-09-16,The rise of spin-flip transitions in the anomalous Hall effect of FePt alloy,"We carry out first-principles calculations which demonstrate the importance
+of spin-flip transitions for the intrinsic anomalous Hall conductivity of
+ordered FePt alloys. We show the such transitions get enhanced by large
+spin-orbit coupling of Pt atoms, becoming negligible when Pt is replaced by
+lighter isoelectronic Pd. We find that spin-flip transitions in FePt originate
+not only from conventional band anticrossings at the Fermi level, but also from
+transitions between well-separated pairs of bands with similar dispersions. We
+also predict a strong anisotropy in the anomalous Hall conductivity of FePt,
+which comes from spin-flip transitions entirely, and investigate the influence
+of disorder on it.",1009.3184v1
+2011-02-22,Nodeless energy gaps of single-crystalline Ba0.68K0.32Fe2As2 as seen via 75As NMR,"We report $^{75}$As nuclear magnetic resonance studies on a very clean
+hole-doped single-crystal Ba$_{0.68}$K$_{0.32}$Fe$_{2}$As$_{2}$ ($T_{\rm
+{c}}=38.5$ K). The spin-lattice relaxation rate $1/T_{1}$ shows an exponential
+decrease below $T \simeq 0.45 T_{\rm c}$ down to $T \simeq 0.11 T_{\rm c}$,
+which indicates a fully opened energy gap. From the ratio $(T_{1})_{c} /
+(T_{1})_{a}$, where $a$ and $c$ denote the crystal directions, we find that the
+antiferromagnetic spin fluctuation is anisotropic in the spin space above
+$T_{\rm c}$. The anisotropy decreases below $T_{\rm c}$ and disappears at $T
+\rightarrow 0$. We argue that the anisotropy stems from spin-orbit coupling
+whose effect vanishes when spin-singlet electron pairs form with a nodeless
+gap.",1102.4417v2
+2011-04-17,Topological surface state under graphene for two-dimensional spintronics in air,"Spin currents which allow for a dissipationless transport of information can
+be generated by electric fields in semiconductor heterostructures in the
+presence of a Rashba-type spin-orbit coupling. The largest Rashba effects occur
+for electronic surface states of metals but these cannot exist but under
+ultrahigh vacuum conditions. Here, we reveal a giant Rashba effect ({\alpha}_R
+~ 1.5E-10 eVm) on a surface state of Ir(111). We demonstrate that its spin
+splitting and spin polarization remain unaffected when Ir is covered with
+graphene. The graphene protection is, in turn, sufficient for the spin-split
+surface state to survive in ambient atmosphere. We discuss this result along
+with evidences for a topological protection of the surface state.",1104.3308v1
+2011-06-08,Quantum Magnetism with Polar Alkali Dimers,"We show that dipolar interactions between ultracold polar alkali dimers in
+optical lattices can be used to realize a highly tunable generalization of the
+t-J model, which we refer to as the t-J-V-W model. The model features
+long-range spin-spin interactions J_z and J_perp of XXZ type, long-range
+density-density interaction V, and long-range density-spin interaction W, all
+of which can be controlled in both magnitude and sign independently of each
+other and of the tunneling t. The ""spin"" is encoded in the rotational degree of
+freedom of the molecules, while the interactions are controlled by applied
+static electric and continuous-wave microwave fields. Furthermore, we show that
+nuclear spins of the molecules can be used to implement an additional (orbital)
+degree of freedom that is coupled to the original rotational degree of freedom
+in a tunable way. The presented system is expected to exhibit exotic physics
+and to provide insights into strongly correlated phenomena in condensed matter
+systems. Realistic experimental imperfections are discussed.",1106.1655v1
+2012-02-01,Fractionalized topological insulators from frustrated spin models in three dimensions,"We present a theory of three dimensional fractionalized topological
+insulators in the form of U(1) spin liquids with gapped fermionic spinons in
+the bulk and topologically protected gapless spinon surface states. Starting
+from a spin-1/2 model on a pyrochlore lattice, with frustrated
+antiferromagnetic and ferromagnetic exchange interactions, we show that
+decomposition of the latter interactions, within slave-fermion representation
+of the spins, can naturally give rise to an emergent spin-orbit coupling for
+the spinons. This stabilizes a fractionalized topological insulators which also
+have bulk bond spin-nematic order. Finally, we describe the low energy
+properties of these states.",1202.0291v3
+2012-02-26,Topologically non-trivial superfluid phases and Majorana fermions from Kohn-Luttinger effect,"Spin-triplet p-wave superfluids of single-species (or spin-polarized)
+fermionic atoms is a topological superfluid. In 2D such a superfluid supports
+zero-energy topological Majorana fermion excitations in order parameter defects
+such as vortices and sample edges. In 3D these superfluids support
+topologically protected Dirac points in the bulk spectrum and flat surface
+Majorana arcs. Despite the promise, creating a spin-triplet p-wave
+single-species fermionic superfluid either from direct p-wave Feshbach
+resonance or indirectly from the recently proposed artificial spin-orbit and
+Zeeman couplings can be technologically challenging. Here we show that such
+topological superfluids can be far more simply created by using the
+Kohn-Luttinger effect applied to two species of spin-polarized fermions with a
+density imbalance. We discuss how the topological Majorana excitations of the
+resulting superfluids can be identified using recently-developed experimental
+techniques.",1202.5784v1
+2012-06-07,Magneto-Josephson effects in junctions with Majorana bound states,"We investigate 1D quantum systems that support Majorana bound states at
+interfaces between topologically distinct regions. In particular, we show that
+there exists a duality between particle-hole and spin degrees of freedom in
+certain spin-orbit-coupled 1D platforms such as topological insulator edges.
+This duality results in a spin analogue of previously explored `fractional
+Josephson effects'---that is, the spin current flowing across a magnetic
+junction exhibits 4\pi-periodicity in the relative magnetic field angle across
+the junction. Furthermore, the interplay between the particle-hole and spin
+degrees of freedom results in unconventional magneto-Josephson effects, such
+that the Josephson current is a function of the magnetic field orientation with
+periodicity 4\pi.",1206.1581v1
+2012-07-13,Spin and Pseudospin symmetries in the Dirac equation with central Coulomb potentials,"We analyze in detail the analytical solutions of the Dirac equation with
+scalar S and vector V Coulomb radial potentials near the limit of spin and
+pseudospin symmetries, i.e., when those potentials have the same magnitude and
+either the same sign or opposite signs, respectively. By performing an
+expansion of the relevant coefficients we also assess the perturbative nature
+of both symmetries and their relations the (pseudo)spin-orbit coupling. The
+former analysis is made for both positive and negative energy solutions and we
+reproduce the relations between spin and pseudospin symmetries found before for
+nuclear mean-field potentials. We discuss the node structure of the radial
+functions and the quantum numbers of the solutions when there is spin or
+pseudospin symmetry, which we find to be similar to the well-known solutions of
+hydrogenic atoms.",1207.3324v1
+2013-03-06,Li$_2$RhO$_3$: A spin-glassy relativistic Mott insulator,"Motivated by the rich interplay among electronic correlation, spin-orbit
+coupling (SOC), crystal-field splitting, and geometric frustrations in the
+honeycomb-like lattice, we systematically investigated the electronic and
+magnetic properties of Li$_2$RhO$_3$. The material is semiconducting with a
+narrow band gap of $\Delta\sim$78 meV, and its temperature dependence of
+resistivity conforms to 3D variable range hopping mechanism. No long-range
+magnetic ordering was found down to 0.5 K, due to the geometric frustrations.
+Instead, single atomic spin-glass behavior below the spin-freezing temperature
+($\sim$6 K) was observed and its spin dynamics obeys the universal critical
+slowing down scaling law. First principle calculations suggested it to be a
+relativistic Mott insulator mediated by both electronic correlation and SOC.
+With moderate strength of electronic correlation and SOC, our results shed new
+light to the research of Heisenberg-Kitaev model in realistic materials.",1303.1235v2
+2013-06-07,Negative Magnetoresistance and Spin Filtering of Spin-Coupled Diiron-Oxo Clusters,"Spin dependent transport has been investigated for an {\it open shell
+singlet} diiron-oxo cluster. Currents and magnetoresistances have been studied,
+as a function of spin state, within the non-equilibrium Green's function
+approach. The applied bias can be used for tuning the sign of the observed
+magnetoresistance. A colossal magnetoresistance ratio has been determined, on
+the order of to 6000$%$, for hydrogen anchoring. Applied biases lower than 0.3
+V, in conjunction with sulfur anchoring, induce a negative magnetoresistance
+due to lowering of the anchor-scatterer tunneling barrier. In addition, the
+diiron-oxo cluster displays nearly perfect spin filtering for parallel
+alignment of the iron magnetic moments due to energetic proximity, relative to
+the Fermi level, of its highest occupied molecular orbitals.",1306.1588v2
+2013-06-19,AC/DC Spin and Valley Hall Effects in Silicene and Germanene,"The intrinsic spin and valley Hall conductivities of silicene, germanene and
+other similar two dimensional crystals are explored theoretically. Particular
+attention is given to the effects of the intrinsic spin-orbit coupling,
+electron doping and the type of insulating phase of the system (i.e., a
+topological insulator or a band insulator) which can be tuned by a
+perpendicular electric field. At finite frequency, the transverse edge to which
+carriers of particular spin and valley label flow can be controlled such that
+an accumulation of a particular combination of spin and valley index can be
+obtained. The direction of flow is found to be dependent on the type of
+insulating phase. The magnitude of the Hall conductivity response is enhanced
+from the DC values at certain incident photon frequencies associated with the
+onset of interband transitions. Analytic results are presented for both the DC
+and finite frequency results.",1306.4591v1
+2013-10-07,"Spin-dependent phenomena and device concepts explored in (Ga,Mn)As","Over the past two decades, the research of (Ga,Mn)As has led to a deeper
+understanding of relativistic spin-dependent phenomena in magnetic systems. It
+has also led to discoveries of new effects and demonstrations of unprecedented
+functionalities of experimental spintronic devices with general applicability
+to a wide range of materials. In this article we review the basic material
+properties that make (Ga,Mn)As a favorable test-bed system for spintronics
+research and discuss contributions of (Ga,Mn)As studies in the general context
+of the spin-dependent phenomena and device concepts. Special focus is on the
+spin-orbit coupling induced effects and the reviewed topics include the
+interaction of spin with electrical current, light, and heat.",1310.1944v2
+2013-10-29,Ferromagnetic Order Analysis of Fe- and FeO-modified Graphene-nano-ribbon,"Graphene-nano-ribbon (GNR) is very attractive for ultra-high density
+spintronics devices. For checking a capability of self-induced ferromagnetic
+order, Fe- and FeO-modified GNR were analyzed based on the density functional
+theory. Model unit cells were [C32H2Fe2] and [C32H2Fe2O2]. Calculated results
+show the most stable spin state to be Sz=8/2 in [C32H2Fe2], whereas Sz=6/2 in
+[C32H2Fe2O2]. Magnetic moment M of Fe in [C32H2Fe2] was 3.65{\mu}B, which could
+be explained based on the Hund-rule considering donated charge to carbon to be
+M*=3.67{\mu}B . There is a capability of ferromagnetic Fe spin array through an
+interaction with carbon {\pi}-conjugated spin system. There shows a long-range
+super-exchange order in [C32H2Fe2O2]. Optimized atomic configuration gave the
+typical 90 degree super-exchange coupling between Fe-3d and O-2p orbit.
+Magnetic moment of Fe by DFT was 2.58{\mu}B, whereas super-exchange model
+considering donated charge to oxygen gave an estimated magnetic moment to be
+2.60{\mu}B. Sign of magnetic moment of Fe and O are all up-spin each other. We
+could expect ferromagnetic long-range-order. Band structure was analyzed in
+FeO-modified case, which suggested half-metal like behavior. We can expect
+several spintronics applications as like a spin filter.",1310.7740v1
+2013-11-05,Interplay of exciton condensation and quantum spin Hall effect in InAs/GaSb bilayers,"We study the phase diagram of the inverted InAs/GaSb bilayer quantum wells.
+For small tunneling amplitude between the layers, we find that the system is
+prone to formation of an s-wave exciton condensate phase, where the
+spin-structure of the order parameter is uniquely determined by the small
+spin-orbit coupling arising from the bulk inversion asymmetry. The phase is
+topologically trivial and does not support edge transport. On the contrary, for
+large tunneling amplitude, we obtain a topologically non-trivial quantum spin
+Hall insulator phase with a p-wave exciton order parameter, which enhances the
+hybridization gap. These topologically distinct insulators are separated by an
+insulating phase with spontaneously broken time-reversal symmetry. Close to the
+phase transition between the quantum spin Hall and time-reversal broken phases,
+the edge transport shows quantized conductance in small samples, whereas in
+long samples the mean free path associated with the backscattering at the edge
+is temperature independent, in agreement with recent experiments.",1311.1111v2
+2014-01-17,Nonreciprocal spin-wave channeling along textures driven by the Dzyaloshinskii-Moriya interaction,"Ultrathin metallic ferromagnets on substrates with strong spin-orbit coupling
+can exhibit induced chiral interactions of the Dzyaloshinskii-Moriya (DM) form.
+For systems with perpendicular anisotropy, the presence of DM interactions has
+important consequences for current-driven domain-wall motion and underpins
+possible spintronic applications involving skyrmions. We show theoretically how
+spin textures driven by the DM interaction allow nonreciprocal channeling of
+spin waves, leading to measurable features in magnetic wires, dots, and domain
+walls. Our results provide methods for detecting induced DM interactions in
+metallic multilayers and controlling spin wave propagation in ultrathin
+nanostructures.",1401.4439v3
+2014-06-30,Spin-dependent polaron formation dynamics in Eu$_{0.75}$Y$_{0.25}$MnO$_3$ probed by femtosecond pump-probe spectroscopy,"We present a femtosecond optical pump-probe study of the multiferroic
+manganite Eu$_{0.75}$Y$_{0.25}$MnO$_3$. The optical response of the material at
+pump energies of 1.55 and 3.1 eV is dominated by the $d$-$d$ and $p$-$d$
+transitions of the Mn$^{3+}$ ions. The relaxation of photoexcited electrons
+includes the relaxation of the Jahn-Teller distortion and polaron trapping at
+Mn$^{2+}$ and Mn$^{4+}$ sites. Ultrafast switching of superexchange
+interactions due to modulated $e_g$ orbital occupancy creates a localized spin
+excitation, which then decays on a time scale of tens of picoseconds at low
+temperatures. The localized spin state decay appears as a tremendous increase
+in the amplitude of the photoinduced reflectance, due to the strong coupling of
+optical transitions to the spin-spin correlations in the crystalline $a$-$b$
+plane.",1407.0073v1
+2014-07-03,Geometric Photonic Spin Hall Effect with Metapolarization,"We develop a geometric photonic spin Hall effect (PSHE) which manifests as
+spin-dependent shift in momentum space. It originates from an effective
+space-variant Pancharatnam-Berry (PB) phase created by artificially engineering
+the polarization distribution of the incident light. Unlikely the previously
+reported PSHE involving the light-matter interaction, the resulting
+spin-dependent splitting in the geometric PSHE is purely geometrically depend
+upon the polarization distribution of light which can be tailored by assembling
+its circular polarization basis with suitably magnitude and phase. This
+metapolarization idea enables us to manipulate the geometric PSHE by suitably
+tailoring the polarization geometry of light. Our scheme provides great
+flexibility in the design of various polarization geometry and
+polarization-dependent application, and can be extrapolated to other physical
+system, such as electron beam or atom beam, with the similar spin-orbit
+coupling underlying.",1407.0805v1
+2014-07-15,Transverse Spin and Classical Gluon Fields: Combining Two Perspectives on Hadronic Structure,"In recent decades, the spin and transverse momentum of quarks and gluons were
+found to play integral roles in the structure of the nucleon. Simultaneously,
+the onset of gluon saturation in hadrons and nuclei at high energies was
+predicted to result in a new state of matter dominated by classical gluon
+fields. Understanding both of these contributions to hadronic structure is
+essential for current and future collider phenomenology. In this Dissertation,
+we study the combined effects of transverse spin and gluon saturation using the
+Glauber-Gribov-Mueller / McLerran-Venugopalan model of a heavy nucleus in the
+quasi-classical approximation. We investigate the use of a
+transversely-polarized projectile as a probe of the saturated gluon fields in
+the nucleus, finding that the transverse spin asymmetry of produced particles
+couples to the component of the gluon fields which is antisymmetric under both
+time reversal and charge conjugation. We also analyze the effects of saturation
+on the transverse spin asymmetry (Sivers function) of quarks within the wave
+function of the nucleus, finding that gluon saturation preferentially generates
+the asymmetry through the orbital angular momentum of the nucleons, together
+with nuclear shadowing.",1407.4047v1
+2014-09-04,Electron with arbitrary pseudo spins in multilayer graphene,"Using the low-energy effective Hamiltonian of the ABC-stacked multilayer
+graphene, pseudo spin coupling to real orbital angular momentum of electron in
+multilayer graphene is investigated. We show that electron wave function in
+N-layer graphene mimics behavior of particle with spin of N/2. It is said that
+for N greater than 1 the low-energy effective Hamiltonian for ABC-stacked
+graphene is no longer used to describe pseudo spin 1/2-particle wave function.
+The wave function of electron in multilayer graphene may behave like fermionic
+(or bosonic) particle when N is odd (or even). This work proposes a theory of
+graphene as a host material of electron with arbitrary pseudo spins, tunable by
+changing number of graphene layers.",1409.1426v3
+2014-09-19,Many-Body Spin Echo,"We predict a universal echo phenomenon present in the time evolution of
+many-body states of interacting quantum systems described by Fermi-Hubbard
+models. It consists of the coherent revival of transition probabilities echoing
+a sudden flip of the spins that, contrary to its single-particle (Hahn)
+version, is not dephased by interactions or spin-orbit coupling. The many-body
+spin echo signal has a universal shape independent of the interaction strength,
+and an amplitude and sign depending only on combinatorial relations between the
+number of particles and the number of applied spin flips. Our analytical
+predictions, based on semiclassical interfering amplitudes in Fock space
+associated with chaotic mean-field solutions, are tested against extensive
+numerical simulations confirming that the coherent origin of the echo lies in
+the existence of anti-unitary symmetries.",1409.5684v3
+2014-09-28,Universal Ratio of Intrinsic Resistivities of Spin Helix in B20 (Fe-Co)Si Magnets,"The B20 magnets with the Dzyaloshinskii-Moriya (D-M) interaction exhibit spin
+helix and Skyrmion spin textures unattainable in traditional Heisenberg
+ferromagnets. We have determined the intrinsic resistivity of the spin helix,
+which is a macroscopic Bloch domain wall, in B20 (Fe-Co)Si magnets. We found a
+universal resistance ratio of gamma = 1.35 with current parallel and
+perpendicular to the helix, independent of composition and temperature. This
+gamma value is much smaller than 3, the well-known minimum value for domain
+wall resistivity in traditional ferromagnets, due to the significant spin-orbit
+coupling in the B20 magnets.",1409.7869v1
+2014-10-20,Gravitational spin Hamiltonians from the S matrix,"We utilize generalized unitarity and recursion relations combined with
+effective field theory(EFT) techniques to compute spin dependent interaction
+terms for inspiralling binary systems in the post newtonian(PN) approximation.
+Using these methods offers great computational advantage over traditional
+techniques involving feynman diagrams, especially at higher orders in the PN
+expansion. As a specific example, we reproduce the spin-orbit interaction up to
+2.5 PN order as also the leading order $S^2$(3PN) hamiltonian for an arbitrary
+massive object. We also obtain the unknown $S^3$(3.5PN) spin hamiltonian for an
+arbitrary massive object in terms of its low frequency linear response to
+gravitational perturbations, which was till now known only for a black hole.
+Furthermore, we derive the missing $S^4$ Hamiltonian at leading order(4PN) for
+an arbitrary massive object and establish that a minimal coupling of a massive
+elementary particle to gravity leads to a black hole structure. Finally, the
+Kerr metric is obtained as a series in $G_N$ by comparing the action of a test
+particle in the vicinity of a spinning black hole to the derived potential.",1410.5348v2
+2014-11-07,Effect of cosmic string on spin dynamics,"In the present paper, we have investigated the role of cosmic string on spin
+current and Hall electric field. Due to the background cosmic string, the
+modified electric field of the system generates renormalized spin orbit
+coupling, which induces a modified non-Abelian gauge field. The defect causes a
+change in the AB and AC phases appearing due to the modified electromagnetic
+field. In addition, for a time varying electric field we perform explicit
+analytic calculations to derive the exact form of spin electric field and spin
+current, which is defect parameter dependent and of oscillating type.
+Furthermore, in an asymmetric crystal within the Drude model approach we
+investigate the dependence of the cosmic string parameters on cosmic string
+induced Hall electric field.",1411.1818v1
+2015-01-22,Relativistic dynamical spin excitations of magnetic adatoms,"We present a first-principles theory of dynamical spin excitations in the
+presence of spin-orbit coupling. The broken global spin rotational invariance
+leads to a new sum rule. We explore the competition between the magnetic
+anisotropy energy and the external magnetic field, as well as the role of
+electron-hole excitations, through calculations for 3$d$-metal adatoms on the
+Cu(111) surface. The spin excitation resonance energy and lifetime display
+non-trivial behavior, establishing the strong impact of relativistic effects.
+We legitimate the use of the Landau-Lifshitz-Gilbert equation down to the
+atomic limit, but with parameters that differ from a stationary theory.",1501.05509v1
+2015-02-24,Unidirectional spin Hall magnetoresistance in ferromagnet/normal metal bilayers,"Magnetoresistive effects are usually invariant upon inversion of the
+magnetization direction. In noncentrosymmetric conductors, however, nonlinear
+resistive terms can give rise to a current dependence that is quadratic in the
+applied voltage and linear in the magnetization. Here we demonstrate that such
+conditions are realized in simple bilayer metal films where the spin-orbit
+interaction and spin-dependent scattering couple the current-induced spin
+accumulation to the electrical conductivity. We show that the longitudinal
+resistance of Ta|Co and Pt|Co bilayers changes when reversing the polarity of
+the current or the sign of the magnetization. This unidirectional
+magnetoresistance scales linearly with current density and has opposite sign in
+Ta and Pt, which we associate with the modification of the interface scattering
+potential induced by the spin Hall effect in these materials. Our results
+suggest a route to control the resistance and detect magnetization switching in
+spintronic devices using a two-terminal geometry, which applies also to
+heterostructures including topological insulators.",1502.06898v2
+2015-06-15,Charge and spin edge currents in two-dimensional Floquet topological superconductors,"A time periodic driving on a topologically trivial system induces edge modes
+and topological properties. In this work we consider triplet and singlet
+superconductors subject to periodic variations of the chemical potential,
+spin-orbit coupling and magnetization, in both topologically trivial and
+nontrivial phases, and study their influence on the charge and spin currents
+that propagate along the edges of the two-dimensional system, for moderate to
+large driving frequencies. Currents associated with the edge modes are induced
+in the trivial phases and enhanced in the topological phases. In some cases
+there is a sign reversal of the currents as a consequence of the periodic
+driving. The edge states associated with the finite quasi-energy states at the
+edge of the Floquet zone are in general robust, while the stability of the zero
+quasi-energy states depends on the parameters. Also, the spin polarization of
+the Floquet spectrum quasi-energies is strong as for the unperturbed
+topological phases. It is found that in some cases the unperturbed edge states
+are immersed in a continuum of states due to the perturbation, particularly if
+the driving frequency is not large enough. However, their contribution to the
+edge currents and spin polarization is still significant.",1506.04678v1
+2015-06-17,Partial-wave and helicity operators for the scattering of two hadrons in lattice QCD,"Partial-wave operators for lattice QCD are developed in order to facilitate
+the identification of the spins of two-hadron scattering states corresponding
+to zero total momentum. Taking the periodic boundary conditions for lattice
+states into account, orthogonal sets of partial-wave operators for orbital
+angular momentum are identified. When combined with the intrinsic spins of the
+hadrons, orthogonal sets of parent operators for total angular momentum $J$ and
+projection $M$ are obtained. The parent operators are subduced to irreducible
+representations of the octahedral group in order to obtain descendant operators
+for use in lattice calculations. The descendant operators retain orthogonality
+with respect to $J$. The spin of a state can be identified by the spin of
+parent operators that dominate creation of the state. For nonzero total
+momentum, operators are developed for a range of helicities and they are
+subduced to irreducible representations corresponding to the different
+directions of total momentum. Sets of operators that include a sufficient range
+of helicities allow identification of spin $J$ when a state couples to
+operators with helicities less than or equal to $J$, but not to operators with
+higher helicities.",1506.05492v1
+2015-07-21,Interaction Vertex for Classical Spinning Particles,"We consider a model of the classical spinning particle in which the coadjoint
+orbits of the Poincare group are parametrized by two pairs of canonically
+conjugate four vectors, one representing the standard position and momentum
+variables and the other which encodes the spinning degrees of freedom. This
+""Dual Phase Space Model"" is shown to be a consistent theory of both massive and
+massless particles and allows for coupling to background fields such as
+electromagnetism. The on-shell action is derived and shown to be a sum of two
+terms, one associated with motion in spacetime and the other with motion in
+""spin space."" Interactions between spinning particles are studied and a
+necessary and sufficient condition for consistency of a three-point vertex is
+established.",1507.05826v1
+2015-11-26,Strong magnetic frustration and anti-site disorder causing spin-glass behavior in honeycomb Li2RhO3,"With large spin-orbit coupling, the $t_{2g}^5$ electron configuration in
+$d$-metal oxides is prone to highly anisotropic exchange interactions and
+exotic magnetic properties. In $5d^5$ iridates, given the existing variety of
+crystal structures, the magnetic anisotropy can be tuned from antisymmetric to
+symmetric Kitaev-type, with interaction strengths that outsize the isotropic
+terms. By many-body electronic-structure calculations we here address the
+nature of the magnetic exchange and the intriguing spin-glass behavior of
+Li$_2$RhO$_3$, a $4d^5$ honeycomb oxide. For pristine crystals without Rh-Li
+site inversion, we predict a dimerized ground state as in the isostructural
+$5d^5$ iridate Li$_2$IrO$_3$, with triplet spin dimers effectively placed on a
+frustrated triangular lattice. With Rh-Li anti-site disorder, we explain the
+observed spin-glass phase as a superposition of different, nearly degenerate
+symmetry-broken configurations.",1511.08333v1
+2016-04-13,Charge and spin diffusion on the metallic side of the metal-insulator transition: a self-consistent approach,"We develop a self-consistent theory describing the spin and spatial electron
+diffusion in the impurity band of doped semiconductors under the effect of a
+weak spin-orbit coupling. The resulting low-temperature spin-relaxation time
+and diffusion coefficient are calculated within different schemes of the
+self-consistent framework. The simplest of these schemes qualitatively
+reproduces previous phenomenological developments, while more elaborate
+calculations provide corrections that approach the values obtained in numerical
+simulations. The results are universal for zinc-blende semiconductors with
+electron conductance in the impurity band, and thus they are able to account
+for the measured spin-relaxation times of materials with very different
+physical parameters. From a general point of view, our theory opens a new
+perspective for describing the hopping dynamics in random quantum networks.",1604.03917v2
+2016-07-22,Quantum spin Hall insulators in centrosymmetric thin films composed from topologically trivial BiTeI trilayers,"The quantum spin Hall insulators predicted ten years ago and now
+experimentally observed are instrumental for a breakthrough in nanoelectronics
+due to non-dissipative spin-polarized electron transport through their edges.
+For this transport to persist at normal conditions, the insulators should
+possess a sufficiently large band gap in a stable topological phase. Here, we
+theoretically show that quantum spin Hall insulators can be realized in
+ultra-thin films constructed from a trivial band insulator with strong
+spin-orbit coupling. The thinnest film with an inverted gap large enough for
+practical applications is a centrosymmetric sextuple layer built out of two
+inversely stacked non-centrosymmetric BiTeI trilayers. This nontrivial sextuple
+layer turns out to be the structure element of an artificially designed strong
+three-dimensional topological insulator Bi$_2$Te$_2$I$_2$. We reveal general
+principles of how a topological insulator can be composed from the structure
+elements of the BiTeX family (X=I, Br, Cl), which opens new perspectives
+towards engineering of topological phases.",1607.06612v2
+2016-09-07,Spin-electric Berry phase shift in triangular molecular magnets,"We propose a Berry phase effect on the chiral degrees of freedom of a
+triangular magnetic molecule. The phase is induced by adiabatically varying an
+external electric field in the plane of the molecule via a spin-electric
+coupling mechanism present in these frustrated magnetic molecules. The Berry
+phase effect depends on spin-orbit interaction splitting and on the electric
+dipole moment. By varying the amplitude of the applied electric field, the
+Berry phase difference between the two spin states can take any arbitrary value
+between zero and $\pi$, which can be measured as a phase shift between the two
+chiral states by using spin-echo techniques. Our result can be used to realize
+an electric field induced geometric phase-shift gate acting on a chiral qubit
+encoded in the ground state manifold of the triangular magnetic molecule.",1609.02055v3
+2016-09-25,Quantum Spin Hall Effect in Twisted Bilayer Graphene,"Motivated by a recent experiment (Sanchez-Yamagishi et.al, arXiv:1602.06815)
+reporting evidence of helical spin-polarized edge states in layer-biased
+twisted bilayer graphene under a magnetic flux, we study the possibility of
+stabilising a Quantum Spin Hall (QSH) phase in such a system, without Zeeman or
+spin-orbit couplings, and with a QSH gap induced instead by electronic
+interactions. We analyse how magnetic flux, electric field, interlayer rotation
+angle, and interactions (treated at a mean field level) combine to produce a
+pseudo-QSH with broken time-reversal symmetry, and spin-polarized helical edge
+states. The effect is a consequence of a robust interaction-induced
+ferrimagnetic ordering of the Quantum Hall ground state under an interlayer
+bias, provided the two rotated layers are effectively decoupled at low
+energies. We discuss in detail the electronic structure, and the constraints on
+system parameters, such as the angle, interactions and magnetic flux, required
+to reach the pseudo-QSH phase. We find, in particular, that purely local
+electronic interactions are not sufficient to account for the experimental
+observations, which demand at least nearest-neighbour interactions to be
+included.",1609.07734v1
+2018-01-31,Exotic Superconductivity with Enhanced Energy Scales in Three Band Crossing Materials,"Three band crossings can arise in three dimensional quantum materials with
+certain space group symmetries. The low energy Hamiltonian supports spin
+$\textit{one}$ fermions and a flat band. We study the pairing problem in this
+setting. We write down a minimal BCS Hamiltonian and decompose it into
+spin-orbit coupled irreducible pairing channels. We then solve the resulting
+gap equations in channels with zero total angular momentum. We find that in the
+spin singlet channel (and also in an unusual `spin quintet' channel),
+superconductivity is enormously enhanced, with a possibility for the critical
+temperature to be $\textit{linear}$ in interaction strength. Meanwhile, in the
+spin triplet channel, the superconductivity exhibits features of conventional
+BCS theory due to the absence of flat band pairing. Three band crossings thus
+represent an exciting new platform for realizing exotic superconducting states
+with enhanced energy scales. We also discuss the effects of doping, nonzero
+temperature, and of retaining additional terms in the $\mathbf{k} \cdot
+\mathbf{p}$ expansion of the Hamiltonian.",1802.00013v2
+2018-11-01,Spin-valley-controlled photonic topological insulator,"The discovery of photonic topological insulators (PTIs) has opened the door
+to fundamentally new topological states of light.Current
+time-reversal-invariant PTIs emulate either the quantum spin Hall (QSH) effect
+or the quantum valley Hall (QVH) effect in condensed-matter systems, in order
+to achieve topological transport of photons whose propagation is predetermined
+by either 'photonic pseudospin' (abbreviated as 'spin') or valley. Here we
+demonstrate a new class of PTIs, whose topological phase is not determined
+solely by spin or valley, but is controlled by the competition between their
+induced gauge fields. Such a competition is enabled by tuning the strengths of
+spin-orbit coupling (SOC) and inversion-symmetry breaking in a single PTI. An
+unprecedented topological transition between QSH and QVH phases that is hard to
+achieve in condensed-matter systems is demonstrated. Our study merges the
+emerging fields of spintronics and valleytronics in the same photonic platform,
+and offers novel PTIs with reconfigurable topological phases.",1811.00393v1
+2018-11-30,Subsecond nuclear spin dynamics in $n$-GaAs,"We use time-resolved detection of the Hanle effect and polarized
+photoluminescence with dark intervals to investigate the buildup and decay of
+the spin polarization of nuclei interacting with donor-bound electrons in
+$n$-doped GaAs. Strong hyperfine coupling defines the millisecond timescale of
+the spin dynamics of these nuclei, as distinct from the nuclei far from
+impurity centers, characterized by a thousand times longer spin-relaxation
+time. The dynamics of spin polarization and relaxation attributed to the nuclei
+inside the donor orbit is observed on the time scale from 200 to 425 ms.",1811.12885v2
+2020-07-28,Electron correlation effects on exchange interactions and spin excitations in 2D van der Waals materials,"Despite serious effort, the nature of the magnetic interactions and the role
+of electron-correlation effects in magnetic two-dimensional (2D) van der Waals
+materials remain elusive. Using CrI$_3$ as a model system, we show that the
+calculated electronic structure including nonlocal electron correlations yields
+spin excitations consistent with inelastic neutron scattering measurements.
+Remarkably, this approach identifies an unreported correlation-enhanced
+interlayer super-superexchange, which rotates the magnon Dirac lines off, and
+introduces a gap along, the high-symmetry $\Gamma$-$K$-$M$ path. This discovery
+provides a different perspective on the gap opening mechanism observed in
+CrI$_3$, which was previously associated with spin-orbit coupling through the
+Dzyaloshinskii-Moriya interaction or Kitaev interaction. Our observation
+elucidates the critical role of electron correlations on the spin ordering and
+spin dynamics in magnetic van der Waals materials and demonstrates the
+necessity of explicit treatment of electron correlations in the broad family of
+2D magnetic materials.",2007.14518v2
+2014-03-26,Strongly frustrated triangular spin lattice emerging from triplet dimer formation in honeycomb Li2IrO3,"In quantum magnetism spin dimers are typically associated with spin-singlet
+states. To date, $triplet$ $dimerization$ has not been observed in any 3D or
+quasi-2D material. With this in mind we here discuss the electronic structure
+of the spin-orbit driven $5d^5$ Mott insulator Li$_2$IrO$_3$, a
+honeycomb-lattice system with two crystallographically inequivalent Ir-Ir
+bonds. From $ab$ $initio$ many-body calculations we find that, while both
+Heisenberg and Kitaev couplings are present, the magnetic interactions are
+dominated by a strong isotropic ferromagnetic exchange on only one set of
+bonds. This causes the formation of triplet spin dimers effectively placed on a
+strongly frustrated triangular lattice. The triplet dimers remain protected in
+a large region of the phase diagram, suggesting that Li$_2$IrO$_3$ has a
+long-range incommensurate magnetic ground state that is pushed by the Kitaev
+exchange interactions beyond a standard planar helix configuration.",1403.6698v2
+2017-04-03,Tuning Pairing Amplitude and Spin-Triplet Texture by Curving Superconducting Nanostructures,"We investigate the nature of the superconducting state in curved
+nanostructures with Rashba spin-orbit coupling (RSOC). In bent nanostructures
+with inhomogeneous curvature we find a local enhancement or suppression of the
+superconducting order parameter, with the effect that can be tailored by tuning
+either the RSOC strength or the carrier density. Apart from the local
+superconducting spin-singlet amplitude control, the geometric curvature
+generates non-trivial textures of the spin-triplet pairs through a spatial
+variation of the d-vector. By employing the representative case of an
+elliptically deformed quantum ring, we demonstrate that the amplitude of the
+d-vector strongly depends on the strength of the local curvature and it
+generally exhibits a three-dimensional profile whose winding is tied to that of
+the single electron spin in the normal state. Our findings unveil novel paths
+to manipulate the quantum structure of the superconducting state in RSOC
+nanostructures through their geometry.",1704.00578v1
+2018-05-02,"Symmetry, spin-texture, and tunable quantum geometry in a WTe$_2$ monolayer","The spin orientation of electronic wavefunctions in crystals is an internal
+degree of freedom, typically insensitive to electrical knobs. We argue from a
+general symmetry analysis and a $\vec k \cdot \vec p$ perspective, that
+monolayer 1T'-WTe$_2$ possesses a gate-activated canted spin texture that
+produces an electrically tunable bulk band quantum geometry. In particular, we
+find that due to its out-of-plane asymmetry, an applied out-of-plane electric
+field breaks inversion symmetry to induce both in-plane and out-of-plane
+electric dipoles. These in-turn generate spin-orbit coupling to lift the spin
+degeneracy and enable a bulk band Berry curvature and magnetic moment
+distribution to develop. Further, due to its low symmetry, Berry curvature and
+magnetic moment in 1T'-WTe$_2$ possess a dipolar distribution in momentum
+space, and can lead to unconventional effects such as a current induced
+magnetization and quantum non-linear anomalous Hall effect. These render
+1T'-WTe$_2$ a rich two-dimensional platform for all-electrical control over
+quantum geometric effects.",1805.00939v2
+2011-11-04,Diffusive spin dynamics in ferromagnetic thin films with a Rashba interaction,"In a ferromagnetic metal layer, the coupled charge and spin diffusion
+equations are obtained in the presence of both Rashba spin-orbit interaction
+and magnetism. The mis-alignment between the magnetization and the
+non-equilibrium spin density induced by the Rashba field gives rise to Rashba
+spin torque acting on the ferromagnetic order parameter. In a general form, we
+find that the Rashba torque consists of both in-plane and out-of-plane
+components, ie $\bm{T}=T_{\bot}\hat{\bm{y}}\times{\hat{\bm
+m}}+T_{\parallel}{\hat{\bm m}}\times({\hat{\bm y}}\times{\hat{\bm m}})$.
+Numerical simulations on a two dimensional nano-wire discuss the impact of
+diffusion on the Rashba torque, which reveals a large enhancement to the ratio
+$T_{\parallel}/T_{\bot}$ for thin wires. Our theory provides an explanation to
+the mechanism that drives the magnetization switching in a single ferromagnet
+as observed in the recent experiments.",1111.1216v2
+2012-04-20,Spin Polarization in a AlGaAs/GaAs Quantum Point Contact with in-plane side gates,"We report the observation of an anomalous conductance plateau near G = 0.5 G0
+(G0 = 2e2/h) in asymmetrically biased AlGaAs/GaAs quantum point contacts
+(QPCs), with in-plane side gates in the presence of lateral spin-orbit
+coupling. This is a signature of spin polarization in the narrow portion of the
+QPC. The appearance and evolution of the conductance anomaly has been studied
+at T=4.2K as a function of the potential asymmetry between the side gates. The
+observation of spontaneous spin polarization in a side-gated GaAs QPC could
+eventually lead to the realization of an all-electric spin-valve at tens of
+degrees Kelvin.",1204.4729v1
+2014-06-02,"Berry Phase, Lorentz Covariance, and Anomalous Velocity for Dirac and Weyl Particles","We consider the relation between spin and the Berry-phase contribution to the
+anomalous velocity of massive and massless Dirac particles. We extend the Berry
+connection that depends only on the spatial components of the particle momentum
+to one that depends on the the space and time components in a covariant manner.
+We show that this covariant Berry connection captures the Thomas-precession
+part of the Bargmann-Michel-Telegdi spin evolution, and contrast it with the
+traditional (unitary, but not naturally covariant) Berry connection that
+describes spin-orbit coupling. We then consider how the covariant connection
+enters the classical relativistic dynamics of spinning particles due to
+Mathisson, Papapetrou and Dixon. We discuss the problems that arise with
+Lorentz covariance in the massless case, and trace them mathematically to a
+failure of the Wigner-translation part of the massless-particle little group to
+be an exact gauge symmetry in the presence of interactions, and physically to
+the fact that the measured position of a massless spinning particle is
+necessarily observer dependent.",1406.0354v2
+2016-05-11,Anisotropy of spin coherence in high mobility quantum wells with arbitrary magnetic fields,"We present a theoretical study of the anisotropy of the spin relaxation and
+decoherence in typical quantum wells with an arbitrary magnetic field. In such
+systems, the orientation of the magnetic field relative to the main
+crystallographic directions is crucial, owing to the lack of spin-rotation
+symmetry. For typical high mobility samples, relaxation anisotropies in the
+motional narrowing limit owing to the interplay of Rashba and Dresselhaus spin
+orbit coupling are calculated. We also include the effect of the
+cubic-in-momentum terms. Although commonly ignored in literature, the latter
+were experimentally evidenced by the observation of strong anisotropy in spin
+decoherence measurements by different experimental groups and has long remained
+unexplained.",1605.03399v2
+2016-08-21,Topological transitions and fractional charges induced by strain and magnetic field in carbon nanotubes,"We show that carbon nanotubes (CNT) can be driven through a topological phase
+transition using either strain or a magnetic field. This can naturally lead to
+Jackiw-Rebbi soliton states carrying fractionalized charges, similar to those
+found in a domain wall in the Su-Schrieffer-Heeger model, in a setup with a
+spatially inhomogeneous strain and an axial field. Two types of fractionalized
+states can be formed at the interface between regions with different strain: a
+spin-charge separated state with integer charge and spin zero (or zero charge
+and spin $\pm \hbar/2$), and a state with charge $\pm e/2$ and spin $\pm
+\hbar/4$. The latter state requires spin-orbit coupling in the CNT. We show
+that in our setup, the precise quantization of the fractionalized interface
+charges is a consequence of the symmetry of the CNT under a combination of a
+spatial rotation by $\pi$ and time reversal. Finally, we comment on the effects
+of many-body interaction on this phenomena.",1608.05976v3
+2017-06-07,Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system,"Quantum Hall ferromagnetic transitions are typically achieved by increasing
+the Zeeman energy through in-situ sample rotation, while transitions in systems
+with pseudo-spin indices can be induced by gate control. We report here a
+gate-controlled quantum Hall ferromagnetic transition between two real spin
+states in a conventional two-dimensional system without any in-plane magnetic
+field. We show that the ratio of the Zeeman splitting to the cyclotron gap in a
+Ge two-dimensional hole system increases with decreasing density owing to
+inter-carrier interactions. Below a critical density of $\sim2.4\times 10^{10}$
+cm$^{-2}$, this ratio grows greater than $1$, resulting in a ferromagnetic
+ground state at filling factor $\nu=2$. At the critical density, a resistance
+peak due to the formation of microscopic domains of opposite spin orientations
+is observed. Such gate-controlled spin-polarizations in the quantum Hall regime
+opens the door to realizing Majorana modes using two-dimensional systems in
+conventional, low-spin-orbit-coupling semiconductors.",1706.02044v1
+2017-06-09,Non-equilibrium quantum transport and analytical conductance formula in spin-textured diffusive superconducting heterostructures,"We study non-equilibrium quantum transport of spin, heat, and charge in
+diffusive heterostructures including both superconductors and materials with
+spin-dependent fields, such as textured ferromagnets and spin-orbit coupled
+materials. Using the quasiclassical theory of superconductivity, we derive a
+general analytical formula for the zero-temperature charge conductance valid in
+the non-linear regime. The analytical results are in excellent agreement with
+previous numerical calculations at small but finite temperatures. We predict a
+strong deviation between the conductance spectra and local density of states in
+certain junctions, which is important to correctly identify spectroscopic
+fingerprints of unconventional superconductivity.",1706.03069v2
+2017-06-13,Generalized quasiclassical theory of the long-range proximity effect and spontaneous currents in superconducting heterostructures with strong ferromagnets,"We present the generalized quasiclassical theory of the long-range
+superconducting proximity effect in heterostructures with strong ferromagnets,
+where the exchange splitting is of the order of Fermi energy. In the
+ferromagnet the propagation of spin-triplet Cooper pairs residing on the
+spin-split Fermi surfaces is shown to be governed by the spin-dependent Abelian
+gauge field which results either from the spin-orbital coupling or from the
+magnetic texture. The additional gauge field enters into the quasiclassical
+equations in superposition with the usual electromagnetic vector potential and
+results in the generation of spontaneous superconducting currents and phase
+shifts in various geometries which provide the sources of long-range
+spin-triplet correlations. We derive the Usadel equations and boundary
+conditions for the strong ferromagnet and consider several generic examples of
+the Josephson systems supporting spontaneous currents.",1706.04239v2
+2017-06-19,Chiral Spin Mode on the Surface of a Topological Insulator,"Using polarization-resolved resonant Raman spectroscopy, we explore
+collective spin excitations of the chiral surface states in a three dimensional
+topological insulator, Bi$_2$Se$_3$. We observe a sharp peak at 150 meV in the
+pseudovector $A_2$ symmetry channel of the Raman spectra. By comparing the data
+with calculations, we identify this peak as the transverse collective spin mode
+of surface Dirac fermions. This mode, unlike a Dirac plasmon or a surface
+plasmon in the charge sector of excitations, is analogous to a spin wave in a
+partially polarized Fermi liquid, with spin-orbit coupling playing the role of
+an effective magnetic field.",1706.05776v3
+2017-10-16,Band splitting in bilayer stanene electronic structure scrutinized via first principle DFT calculations,"The recent work on stanene as quantum spin Hall insulators made us
+investigate bilayer stanene using first principle calculations. With an aim of
+improving and developing new properties, via modulating the stacking order (and
+angle) of the bilayers. This stacking of layers has been proven technique for
+modulating the properties of monolayer materials. Here we design multiple
+bilayer systems, with different stacking angles and AA and AB configurations.
+Rather observing an improvement in bandgap due to spin-orbit coupling (SOC), we
+witness a splitting of the band due to SOC, a characteristic behavior of
+stacked MoS2 sheets. This splitting of the bands gives rise to different,
+independent and distinct spin-up and spin-down channels, manifesting a valley
+dependent spin polarization. Also, as a contrast to stacked MoS2 system we
+notice in our system the stacking angle and order, does effect electronic
+states.",1710.05701v2
+2017-10-20,Robust non-Abelian spin liquid and possible intermediate phase in antiferromagnetic Kitaev model with magnetic field,"We investigate the non-Abelian topological chiral spin liquid phase in the
+two-dimensional (2D) Kitaev honeycomb model subject to a magnetic field. By
+combining density matrix renormalization group (DMRG) and exact diagonalization
+(ED) we study the energy spectra, entanglement, topological degeneracy, and
+expectation values of Wilson loop operators, allowing for robust
+characterization. While the ferromagnetic (FM) Kitaev spin liquid is already
+destroyed by a weak magnetic field with Zeeman energy $H_*^\text{FM} \approx
+0.02$, the antiferromagnetic (AFM) spin liquid remains robust up to a magnetic
+field that is an order of magnitude larger, $H_*^\text{AFM} \approx 0.2$.
+Interestingly, for larger fields $H_*^\text{AFM} < H < H_{**}^\text{AFM}$, an
+intermediate gapless phase is observed, before a second transition to the
+high-field partially-polarized paramagnet. We attribute this rich phase
+diagram, and the remarkable stability of the chiral topological phase in the
+AFM Kitaev model, to the interplay of strong spin-orbit coupling and
+frustration enhanced by the magnetic field. Our findings suggest relevance to
+recent experiments on RuCl$_3$ under magnetic fields.",1710.07595v3
+2017-12-20,Electrical spin manipulation in graphene nanostructures,"We propose a mechanism to drive singlet-triplet spin transitions
+electrically, in a wide class of graphene nanostructures that present pairs of
+in-gap zero modes, localized at opposite sublattices. Examples are rectangular
+nanographenes with short zigzag edges, armchair ribbon heterojunctions with
+topological in-gap states and graphene islands with sp$^3$ functionalization.
+The interplay between the hybridization of zero modes and Coulomb repulsion
+leads to symmetric exchange interaction that favors a singlet ground state.
+Application of an off-plane electric field to the graphene nanostructure
+generates an additional Rashba spin-orbit coupling, which results in
+antisymmetric exchange interaction that mixes $S=0$ and $S=1$ manifolds. We
+show that modulation in time of either the off-plane electric field or the
+applied magnetic field permits to perform electrically driven spin resonance in
+a system with very long spin relaxation times.",1712.07282v1
+2019-09-25,Extension of the standard Heisenberg Hamiltonian to multispin exchange interactions,"An extension of the Heisenberg Hamiltonian is discussed, that allows to go
+beyond the standard bilinear spin Hamiltonian taking into account various
+contributions due to multispin interactions having both chiral and non-chiral
+character. The parameters of the extended Hamiltonian are calculated from first
+principles within the framework of the multiple scattering Green function
+formalism giving access to an explicit representation of these parameters in
+real space. The discussions are focused on the chiral interactions, i.e.\
+biquadratic and three-spin Dzyaloshinskii-Moriya like vector interactions
+$\vec{\cal{D}}_{ijij}$ (BDMI) and $\vec{\cal{D}}_{ijkj}$ (TDMI), respectively,
+as well as the three-spin chiral interaction (TCI) $J_{ijk}$. Although all
+parameters are driven by spin-orbit coupling (SOC), some differences in their
+properties are demonstrated by calculations for real materials. In particular
+it is shown that the three-spin chiral interactions $J_{ijk}$ may be topology
+as well as SOC induced, while the TDMI is associated only with the SOC. As the
+magnitude of the chiral interactions can be quite sizable, they can lead to a
+stabilization of a noncollinear magnetic texture in some materials that is
+absent when these interactions are neglected.",1909.11361v2
+2020-01-30,Disorder Dependence of Interface Spin Memory Loss,"The discontinuity of a spin-current through an interface caused by spin-orbit
+coupling is characterized by the spin memory loss (SML) parameter {\delta}. We
+use first-principles scattering theory and a recently developed local current
+scheme to study the SML for Au|Pt, Au|Pd, Py|Pt and Co|Pt interfaces. We find a
+minimal temperature dependence for nonmagnetic interfaces and a strong
+dependence for interfaces involving ferromagnets that we attribute to the spin
+disorder. The SML is larger for Co|Pt than for Py|Pt because the interface is
+more abrupt. Lattice mismatch and interface alloying strongly enhance the SML
+that is larger for a Au|Pt than for a Au|Pd interface. The effect of the
+proximity induced magnetization of Pt is negligible.",2001.11520v1
+2020-02-12,Meron-Like Topological Spin Defects in Monolayer CrCl3,"Noncollinear spin textures in low-dimensional magnetic systems have been
+studied for decades because of their extraordinary properties and promising
+applications derived from the chirality and topological nature. However,
+material realizations of topological spin states are still limited. Employing
+first-principles and Monte Carlo simulations, we propose that monolayer
+chromium trichloride (CrCl3) can be a promising candidate for observing the
+vortex/antivortex type of topological defects, so-called merons. The numbers of
+vortices and antivortices are found to be the same, maintaining an overall
+integer topological unit. By perturbing with external magnetic fields, we show
+the robustness of these meron pairs and reveal a rich phase space to tune the
+hybridization between the ferromagnetic order and meron-like defects. The
+signatures of topological excitations under external magnetic field also
+provide crucial information for experimental justifications. Our study predicts
+that two-dimensional magnets with weak spin-orbit coupling can be a promising
+family for realizing meron-like spin textures.",2002.05208v2
+2020-02-23,An analytic model of chiral-induced spin selectivity,"Organic materials are known to feature long spin-diffusion times, originating
+in a generally small spin-orbit coupling observed in these systems. From that
+perspective, chiral molecules acting as efficient spin selectors pose a puzzle,
+that attracted a lot of attention during the recent years. Here we revisit the
+physical origins of chiral-induced spin selectivity (CISS), and propose a
+simple analytic minimal model to describe it. The model treats a chiral
+molecule as an anisotropic wire with molecular dipole moments aligned
+arbitrarily with respect to the wire's axes, and is therefore quite general.
+Importantly, it shows that helical structure of the molecule is not necessary
+to observe CISS and other chiral non-helical molecules can also be considered
+as a potential candidates for CISS effect. We also show that the suggested
+simple model captures the main characteristics of CISS observed in experiment,
+without the need for additional constraints employed in the previous studies.
+The results pave the way for understanding other related physical phenomena
+where CISS effect plays an essential role.",2002.09938v2
+2020-04-02,Reversible edge spin currents in antiferromagnetically proximitized dichalcogenides,"We explore proximity effects on transition metal dichalcogenide ribbons
+deposited on antiferromagnetic (AFM) insulating substrates. We model these
+hybrid heterostructures using a tight-binding model that incorporates exchange
+and Rashba fields induced by proximity to the AFM material. The robust edge
+states that disperse in the midgap of the dichalcogenide are strongly affected
+by induced exchange fields that reflect different AFM ordering in the
+substrate. This results in enhanced spin-orbit coupling effects and complex
+spin projection content for states on zigzag ribbon edges. Gated systems that
+shift the Fermi level in the midgap range are also shown to exhibit spin
+polarized currents on these edges. Antiparallel exchange fields along the edge
+results in spin currents that can reverse polarization with the applied field.
+The added functionality of these hybrid structures can provide spintronic
+devices and versatile platforms to further exploit proximity effects in diverse
+material systems.",2004.01064v1
+2020-12-09,Spin-lattice model for cubic crystals,"We present a methodology based on the N\'{e}el model to build a classical
+spin-lattice Hamiltonian for cubic crystals capable of describing magnetic
+properties induced by the spin-orbit coupling like magnetocrystalline
+anisotropy and anisotropic magnetostriction, as well as exchange
+magnetostriction. Taking advantage of the analytical solutions of the N\'{e}el
+model, we derive theoretical expressions for the parameterization of the
+exchange integrals and N\'{e}el dipole and quadrupole terms that link them to
+the magnetic properties of the material. This approach allows to build accurate
+spin-lattice models with the desire magnetoelastic properties. We also explore
+a possible way to model the volume dependence of magnetic moment based on the
+Landau energy. This new feature can allow to consider the effects of
+hydrostatic pressure on the saturation magnetization. We apply this method to
+develop a spin-lattice model for BCC Fe and FCC Ni, and we show that it
+accurately reproduces the experimental elastic tensor, magnetocrystalline
+anisotropy under pressure, anisotropic magnetostrictive coefficients, volume
+magnetostriction and saturation magnetization under pressure at
+zero-temperature. This work could constitute a step towards large-scale
+modeling of magnetoelastic phenomena.",2012.05076v3
+2012-05-16,In-gap impurity states as the hallmark of the Quantum Spin Hall phase,"We study the different response to an impurity of the two topologically
+different phases shown by a two dimensional insulator with time reversal
+symmetry, namely, the Quantum Spin Hall and the normal phase. We consider the
+case of graphene as a toy model that features the two phases driven,
+respectively, by intrinsic spin-orbit coupling and inversion symmetry breaking.
+We find that strictly normalizable in-gap impurity states only occur in the
+Quantum Spin Hall phase and carry dissipationless current whose quirality is
+determined by the spin and pseudospin of the residing electron. Our results
+imply that topological order can be unveiled by local probes of defect states.",1205.3737v1
+2017-05-02,Strongly interaction-enhanced valley magnetic response in monolayer WSe2,"Coulomb interaction between electrons lies at the heart of magnetism in
+solids. In contrast to conventional two-dimensional (2D) systems, electrons in
+monolayer transition metal dichalcogenides (TMDs) possess coupled spin and
+valley degrees of freedom by the spin-orbit interaction. The electrons are also
+strongly interacting even in the high-density regime because of the weak
+dielectric screening in two dimensions and a large band mass. The combination
+of these properties presents a unique platform for exploring spin and valley
+magnetism in 2D electron liquids. Here we report an observation by
+magneto-photoluminescence spectroscopy of a nonlinear valley Zeeman effect,
+correlated with an over fourfold enhancement in the exciton g-factor in
+monolayer WSe2. The effect occurs when the Fermi level crosses the spin-split
+upper conduction band, corresponding to a change of the spin-valley degeneracy
+from 2 to 4. The enhancement increases, shows no sign of saturation as the
+sample temperature decreases. Our result suggests the possibility of rich
+many-body ground states in monolayer TMDs with multiple internal degrees of
+freedom.",1705.01078v1
+2017-05-09,"Anomalous, spin, and valley Hall effects in graphene deposited on ferromagnetic substrates","Spin, anomalous, and valley Hall effects in graphene-based hybrid structures
+are studied theoretically within the Green function formalism and linear
+response theory. Two different types of hybrid systems are considered in
+detail: (i) graphene/boron nitride/cobalt(nickel), and (ii) graphene/YIG. The
+main interest is focused on the proximity-induced exchange interaction between
+graphene and magnetic substrate and on the proximity-enhanced spin-orbit
+coupling. The proximity effects are shown to have a significant influence on
+the electronic and spin transport properties of graphene. To find the spin,
+anomalous and valley Hall conductivities we employ certain effective
+Hamiltonians which have been proposed recently for the hybrid systems under
+considerations. Both anomalous and valley Hall conductivities have universal
+values when the Fermi level is inside the energy gap in the electronic
+spectrum.",1705.03220v1
+2019-01-31,Direct Observation of Unusual Interfacial Dzyaloshinskii-Moriya Interaction in Graphene/NiFe/Ta Heterostructure,"Graphene/ferromagnet interface promises a plethora of new science and
+technology. The interfacial Dzyaloshinskii Moriya interaction (iDMI) is
+essential for stabilizing chiral spin textures, which are important for future
+spintronic devices. Here, we report direct observation of iDMI in
+graphene/Ni80Fe20/Ta heterostructure from non-reciprocity in spin-wave
+dispersion using Brillouin light scattering (BLS) technique. Linear scaling of
+iDMI with the inverse of Ni80Fe20 thicknesses suggests primarily interfacial
+origin of iDMI. Both iDMI and spin-mixing conductance increase with the
+increase in defect density of graphene obtained by varying argon pressure
+during sputter deposition of Ni80Fe20. This suggests that the observed iDMI
+originates from defect-induced extrinsic spin-orbit coupling at the interface.
+The direct observation of iDMI at graphene/ferromagnet interface without
+perpendicular magnetic anisotropy opens new route in designing thin film
+heterostructures based on 2-D materials for controlling chiral spin structure
+such as skyrmions and bubbles, and magnetic domain-wall-based storage and
+memory devices.",1901.11287v1
+2019-02-20,Kitaev-like honeycomb magnets: Global phase behavior and emergent effective models,"Compounds of transition metal ions with strong spin-orbit coupling recently
+attracted attention due to the possibility to host frustrated bond-dependent
+anisotropic magnetic interactions. In general, such interactions lead to
+complex phase diagrams that may include exotic phases, e.g. the Kitaev spin
+liquid. Here we report on our comprehensive analysis of the global phase
+diagram of the extended Kitaev-Heisenberg model relevant to honeycomb lattice
+compounds Na2IrO3 and alpha-RuCl3. We have utilized recently developed method
+based on spin coherent states that enabled us to resolve arbitrary spin
+patterns in the cluster ground states obtained by exact diagonalization. Global
+trends in the phase diagram are understood in combination with the analytical
+mappings of the Hamiltonian that uncover peculiar links to known models -
+Heisenberg, Ising, Kitaev, or compass models on the honeycomb lattice - or
+reveal entire manifolds of exact fluctuation-free ground states. Finally, our
+study can serve as a methodological example that can be applied to other spin
+models with complex bond-dependent non-Heisenberg interactions.",1902.07451v1
+2019-02-22,Spin-dependent directional emission from an asymmetry optical waveguide with an embedded quantum dot ensemble,"In this study, we examine a photonic wire waveguide embedded with an ensemble
+of quantum dots that directionally emits into the waveguide depending on the
+spin state of the ensemble. This is accomplished through the aid of the
+spin-orbit interaction of light. The waveguide has a two-step stair-like cross
+section and embeds quantum dots (QDs) only in the upper step, such that the
+circular polarization of emission from the spin-polarized QDs controls the
+direction of the radiation. We numerically verify that more than 70% of the
+radiation from the ensemble emitter is toward a specific direction in the
+waveguide. We also examine a microdisk resonator with a stair-like edge, that
+supports selective coupling of the QD ensemble radiation into a whispering
+galley mode rotating unidirectionally. Our study provides a foundation for
+spin-dependent optoelectronic devices.",1902.08385v1
+2019-03-26,Fully spin-polarized nodal loop semimetals in alkaline-metal monochalcogenide monolayers,"Topological semimetals in ferromagnetic materials have attracted enormous
+attention due to the potential applications in spintronics. Using the
+first-principles density functional theory together with an effective lattice
+model, here we present a new family of topological semimetals with a fully
+spin-polarized nodal loop in alkaline-metal monochalcogenide $MX$ ($M$ = Li,
+Na, K, Rb, Cs; $X$ = S, Se, Te) monolayers. The half-metallic ferromagnetism
+can be established in $MX$ monolayers, in which one nodal loop formed by two
+crossing bands with the same spin components is found at the Fermi energy. This
+nodal loop half-metal survives even when considering the spin-orbit coupling
+owing to the symmetry protection provided by the $\mathcal{M}_{z}$ mirror
+plane. The quantum anomalous Hall state and Weyl-like semimetal in this system
+can be also achieved by rotating the spin from the out-of-plane to the in-plane
+direction. The $MX$ monolayers hosting rich topological phases thus offer an
+excellent materials platform for realizing the advanced spintronics concepts.",1903.11025v1
+2019-11-21,Comprehensive Control of Metamagnetic Transition of Antiferromagnetic Mott Insulator Sr2IrO4 by in-situ Anisotropic Strain,"Metamagnetism in antiferromagnets exhibits distinct critical behaviors and
+dynamics when invoking spin reversal and rotation. Here we show a 0.05%
+anisotropic strain suffices to in-situ modulate the metamagnetic critical field
+of the Mott insulator Sr2IrO4 by over 50%, enabling electrical switching of the
+transition. Resonant x-ray scattering and model simulation reveal that the
+transition is completely tuned from the spin-flop to spin-flip type as the
+strain introduces C4-symmetry-breaking magnetic anisotropy. Simultaneous
+transport study indicates the metamagnetic responses are reflected in the large
+elasto- and magnetoconductance, highlighting the active charge degree of
+freedom in the spin-orbit-coupled Mott state and its potential for
+spin-electronics.",1911.09504v2
+2020-08-26,The Electrical and Spin Properties of Monolayer and Bilayer Janus HfSSe under Vertical Electrical Field,"In this paper, the electrical and spin properties of mono- and bilayer HfSSe
+in the presence of a vertical electric field are studied. The density
+functional theory is used to investigate their properties. Fifteen different
+stacking orders of bilayer HfSSe are considered. The mono- and bilayer
+demonstrate an indirect bandgap, whereas the bandgap of bilayer can be
+effectively controlled by electric field. While the bandgap of bilayer closes
+at large electric fields and a semiconductor to metal transition occurs, the
+effect of a normal electric field on the bandgap of the monolayer HfSSe is
+quite weak. Spin-orbit coupling causes band splitting in the valence band and
+Rashba spin splitting in the conduction band of both mono- and bilayer
+structures. The band splitting in the valence band of the bilayer is smaller
+than a monolayer, however, the vertical electric field increases the band
+splitting in bilayer one. The stacking configurations without mirror symmetry
+exhibit Rashba spin splitting which is enhanced with the electric field.",2008.11361v1
+2020-10-27,Spin-dependent Tunneling Barriers in CoPc/VSe2 from Many-Body Interactions,"Mixed-dimensional magnetic heterostructures are intriguing, newly available
+platforms to explore quantum physics and its applications. Using
+state-of-the-art many-body perturbation theory, we predict the energy level
+alignment for a self-assembled monolayer of cobalt phthalocyanine (CoPc)
+molecules on magnetic VSe 2 monolayers. The predicted projected density of
+states on CoPc agrees with experimental scanning tunneling spectra. Consistent
+with experiment, we predict a shoulder in the unoccupied region of the spectra
+that is absent from mean-field calculations. Unlike the nearly spin-degenerate
+gas phase frontier molecular orbitals, the tunneling barriers at the interface
+are spin-dependent, a finding of interest for quantum information and
+spintronics applications. Both the experimentally observed shoulder and the
+predicted spin-dependent tunneling barriers originate from many-body
+interactions in the interface-hybridized states. Our results showcase the
+intricate many-body physics that governs the properties of these
+mixed-dimensional magnetic heterostructures, and suggests the possibility of
+manipulating the spin-dependent tunneling barriers through modifications of
+interface coupling.",2010.14012v1
+2020-11-14,Photogalvanic Effect in Silicene,"Silicene has introduced itself as an outstanding novel material, which seeks
+its meritorious place among common spintronic devices like Cu and Ag. In this
+work, photogalvanic effect in silicene is studied within the semi-classical
+approach and beyond Dirac point approximation. Normal electric field plays the
+role of effective pseudo-magnetic field which breaks the inversion symmetry and
+splits the conduction and valence bands. The interplay between this external
+field and intrinsic spin-orbit coupling provides spin-valley locking in
+silicene. Spin-valley locking in silicene makes this material superior to its
+carbon counterpart, graphene. Since the absorption of the polarized photons is
+not equivalent at both of the valleys, spin-valley locking leads to a
+spin-polarized photocurrent injection.",2011.07250v2
+2021-04-06,Topological Green function of interacting systems,"We construct a Green function, which can identify the topological nature of
+interacting systems. It is equivalent to the single-particle Green function of
+effective non-interacting particles, the Bloch Hamiltonian of which is given by
+the inverse of the full Green function of the original interacting particles at
+zero frequency. The topological nature of the interacting insulators is
+originated from the coincidence of the poles and the zeros of the diagonal
+elements of the constructed Green function. The cross of the zeros in the
+momentum space closely relates to the topological nature of insulators. As a
+demonstration, using the zero's cross, we identify the topological phases of
+magnetic insulators, where both the ionic potential and the spin exchange
+between conduction electrons and magnetic moments are present together with the
+spin-orbital coupling. The topological phase identification is consistent with
+the topological invariant of the magnetic insulators. We also found an
+antiferromagnetic state with topologically breaking of the spin symmetry, where
+electrons with one spin orientation are in topological insulating state, while
+electrons with the opposite spin orientation are in topologically trivial one.",2104.02344v2
+2021-04-07,Switchable Rashba Anisotropy in Two-dimensional Hybrid Organic-Inorganic Perovskite by Hybrid Improper Ferroelectricity,"Two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) are
+introducing new directions in the 2D materials landscape. The coexistence of
+ferroelectricity and spin-orbit interactions play a key role in their
+optoelectronic properties. We perform a detailed study on a recently
+synthesized ferroelectric 2D-HOIP, (AMP)PbI$_4$ (AMP =
+4-aminomethyl-piperidinium). The calculated polarization and Rashba parameter
+are in excellent agreement with experimental values. We report a striking new
+effect, i.e., an extraordinarily large Rashba anisotropy that is tunable by
+ferroelectric polarization: as polarization is reversed, not only the spin
+texture chirality is inverted, but also the major and minor axes of the Rashba
+anisotropy ellipse in k-space are interchanged - a pseudo rotation. A $k \cdot
+p$ model Hamiltonian and symmetry-mode analysis reveal a quadrilinear coupling
+between the cation-rotation modes responsible for the Rashba ellipse
+pseudo-rotation, the framework rotation, and the polarization. These findings
+may provide new avenues for spin-optoelectronic devices such as spin valves or
+spin FETs.",2104.02970v1
+2021-04-09,Non-thermal breaking of magnetic order via photo-generated spin defects,"In Mott insulators the evolution of antiferromagnetic order to
+superconducting or charge-density-wave-like states upon chemical doping
+underpins the control of quantum phases. Photo-doping can induce similar
+transitions on the ultrafast timescale, however the response of the spin system
+has remained elusive. Here, we use 4D-ultrafast optical spectroscopy to extract
+quantitative magnetic dynamics in the spin-orbit coupled Mott insulator
+Sr3Ir2O7. We demonstrate that light can non-thermally melt long-range spin
+order. At low fluences magnetic order recovers within 1 ps despite
+demagnetization of roughly 50%. However, high fluences induce a crossover to a
+long-lived demagnetized state without increasing the lattice temperature. We
+show that the generation of photo-induced spin defects enables a mechanism that
+stabilizes the demagnetized state which could help expose new transient phases.",2104.04294v2
+2016-03-10,Killing Auger recombination in nanostructures by carrier spin polarization,"In semiconductor nanostructures nonradiative Auger recombination is enhanced
+by the presence of boundaries which relax the momentum conservation and thereby
+removes the threshold reduction for these processes. We propose a method to
+strongly reduce the Auger recombination rate by injecting spin-polarized
+carriers. Our method is illustrated on the example of a quantum well in which
+the spin-orbit coupling of conduction band is negligible as compared to valence
+band and thus holes can be considered as spin-unpolarized. The suppression
+factor of the Auger recombination is determined by the two-dimensional
+character of the system, given by the ratio of the Fermi energy of electrons
+and the separation of the electron levels quantized in the growth direction.
+Our predictions can be tested experimentally and we discuss their implications
+for semiconductor lasers relying on injection of spin-polarized electrons.",1603.03410v1
+2016-12-16,Ultrafast demagnetization in bulk vs thin films: an ab-initio study,"We report on {\it ab-initio} simulations of the quantum dynamics of
+electronic charge and spin when subjected to intense laser pulses. By
+performing separate calculations for a Ni thin film and bulk Ni, we conclude
+that surface effects have a dramatic influence on amplifying the laser induced
+demagnetization. We show that the reason for this amplification is due to
+increased spin-currents on the surface of the thin film. This enhancement is a
+direct consequence of the broken symmetry originating from the surface
+formation. We find that the underlying physics of demagnetization, during the
+early femtoseconds, for both bulk and thin film is dominated by spin-flips
+induced by spin-orbit coupling. After the first $\sim 40$ fs this changes in
+that the dominant cause of demagnetization is the flow of spin-currents, which
+leads to stronger demagnetization in the film compared to that of the bulk.",1612.05663v2
+2017-07-11,Putative spin liquid in the triangle-based iridate Ba$_3$IrTi$_2$O$_9$,"We report on thermodynamic, magnetization, and muon spin relaxation
+measurements of the strong spin-orbit coupled iridate Ba$_3$IrTi$_2$O$_9$,
+which constitutes a new frustration motif made up a mixture of edge- and
+corner-sharing triangles. In spite of strong antiferromagnetic exchange
+interaction of the order of 100~K, we find no hint for long-range magnetic
+order down to 23 mK. The magnetic specific heat data unveil the $T$-linear and
+-squared dependences at low temperatures below 1~K. At the respective
+temperatures, the zero-field muon spin relaxation features a persistent spin
+dynamics, indicative of unconventional low-energy excitations. A comparison to
+the $4d$ isostructural compound Ba$_3$RuTi$_2$O$_9$ suggests that a concerted
+interplay of compass-like magnetic interactions and frustrated geometry
+promotes a dynamically fluctuating state in a triangle-based iridate.",1707.03140v1
+2019-06-27,Spin-polarized electronic surface states of Re(0001): an ab-initio investigation,"We study the electronic structure of the Re(0001) surface by means of
+ab-initio techniques based on the Fully Relativistic (FR) Density Functional
+Theory (DFT) and the Projector Augmented-Wave (PAW) method. We identify the
+main surface states and resonances and study in detail their energy dispersion
+along the main symmetry lines of the SBZ. Moreover, we discuss the effect of
+spin-orbit coupling on the energy splittings and the spin-polarization of the
+main surface states and resonances. Whenever possible, we compare the results
+with previously studied heavy metals surfaces. We find empty resonances,
+located below a gap similar to the L-gap of the (111) fcc surfaces, that have a
+downward dispersion and cross the Fermi level, similarly to the recently
+studied Os(0001) surface. Their spin polarization at the Fermi level is similar
+to that predicted by the Rashba model, but the usual level crossing at
+$\bar{\Gamma}$ is not found with our slab thickness. Moreover, for selected
+states, we follow the spin polarization along the high symmetry lines,
+discussing its behavior with respect to ${\bf k}_{\parallel}$, the wave-vector
+parallel to the surface.",1906.12196v1
+2020-03-06,Competing long-range interactions and spin vector chirality in spin-chains,"Studies of competing orders in 1D magnetic chains have attracted considerable
+attention in recent years, as the presence of long-range Heisenberg
+interactions is found to allow interesting quantum phase transitions. We
+investigate here the role of spin-orbit effects by considering spin-1/2 chains
+in the presence of both collinear and non-collinear long-range interactions. By
+employing exact diagonalization and density matrix renormalization group
+calculations we investigate the rich phase diagram of this system. We find
+transitions from collinear to transverse magnetic correlated order as the
+strength of the non-collinear coupling increases, accompanied by a jump in the
+vector spin chirality order parameter of the system. This shows that tuning
+long-range interactions allows control of the onset of sizable vector spin
+chirality in a system, which may be used to transmit information down the
+chain. We investigate the characteristic structure of the distinct phases and
+explore their possible physical implementation in different materials systems.",2003.03322v1
+2020-06-03,Nonthermal excitonic condensation near a spin-state transition,"We consider a two-orbital Hubbard model with Hund coupling and crystal-field
+splitting and show that in the vicinity of the high-spin/low-spin transition,
+crystal-field quenches can induce an excitonic condensation at initial
+temperatures above the highest ordering temperature in equilibrium. This
+condensation is the effect of an increase in the spin entropy and an associated
+cooling of the effective electronic temperature. We identify a dynamical phase
+transition and show that such quenches can result in long-lived nonthermal
+excitonic condensates which have no analogue in the equilibrium phase diagram.
+The results are interpreted by means of an effective pseudo-spin model.",2006.02096v2
+2020-06-23,Doping-induced quantum spin Hall insulator to superconductor transition,"A unique property of a dynamically generated quantum spin Hall state are
+Goldstone modes that correspond to the long-wavelength fluctuations of the
+spin-orbit coupling order parameter whose topological Skyrmion excitations
+carry charge 2$e$. Within the model considered here, upon varying the chemical
+potential, we observe two transitions: An s-wave superconducting order
+parameter develops at a critical chemical potential $\mu_{c1}$, corresponding
+to the excitation gap of pairs of fermions, and at $\mu_{c2}$ the SO(3) order
+parameter of the quantum spin Hall state vanishes. Using negative-sign-free,
+large-scale quantum Monte Carlo simulations, we show that $\mu_{c1}=\mu_{c2}$
+within our accuracy -- we can resolve dopings away from half filling down to
+$\delta = 0.0017$. The length scale associated with the fluctuations of the
+quantum spin Hall order parameter grows down to our lowest doping, suggesting
+either a continuous or a weakly first-order transition. Contrary to mean-field
+expectations, the doping versus chemical potential curve is not linear,
+indicating a dynamical critical exponent $z > 2$ if the transition is
+continuous.",2006.13239v2
+2021-02-02,Spontaneous magnetization in unitary superconductors with time reversal symmetry breaking,"We report the study of spontaneous magnetization (i.e., spin-polarization)
+for time-reversal symmetry (TRS)-breaking superconductors with unitary pairing
+potentials, in the absence of external magnetic fields or Zeeman fields.
+Spin-singlet ($\Delta_s$) and spin-triplet ($\Delta_t$) pairings can coexist in
+superconductors whose crystal structure lacks inversion symmetry. The TRS can
+be spontaneously broken once a relative phase of $\pm\pi/2$ is developed,
+forming a TRS-breaking unitary pairing state ($\Delta_s\pm i\Delta_t$). We
+demonstrate that such unitary pairing could give rise to spontaneous
+spin-polarization with the help of spin-orbit coupling. Our result provides an
+alternative explanation to the TRS breaking, beyond the current understanding
+of such phenomena in the noncentrosymmetric superconductors. The experimental
+results of Zr$_3$Ir and CaPtAs are also discussed in the view of our theory.",2102.01267v5
+2021-02-22,"Interplay between multipolar spin interactions, Jahn-Teller effect and electronic correlation in a $J_{eff}=\frac{3}{2}$ insulator","In this work we study the complex entanglement between spin interactions,
+electron correlation and Janh-Teller structural instabilities in the 5d$^1$
+$J_{eff}=\frac{3}{2}$ spin-orbit coupled double perovskite $\rm Ba_2NaOsO_6$
+using first principles approaches. By combining non-collinear magnetic
+calculations with multipolar pseudospin Hamiltonian analysis and many-body
+techniques we elucidate the origin of the observed quadrupolar canted
+antifferomagnetic. We show that the non-collinear magnetic order originates
+from Jahn-Teller distortions due to the cooperation of Heisenberg exchange,
+quadrupolar spin-spin terms and both dipolar and multipolar
+Dzyaloshinskii-Moriya interactions. We find a strong competition between
+ferromagnetic and antiferromagnetic canted and collinear quadrupolar magnetic
+phases: the transition from one magnetic order to another can be controlled by
+the strength of the electronic correlation ($U$) and by the degree of
+Jahn-Teller distortions.",2102.10839v1
+2021-07-07,Spin-orbit pumping,"We study theoretically the effect of a rotating electric field on a diffusive
+nanowire and find an effect that is analogous to spin pumping, which refers to
+the generation of spin through a rotating magnetic field. The electron spin
+couples to the electric field because the particle motion induces an effective
+magnetic field in its rest frame. In a diffusive system the velocity of the
+particle, and therefore also its effective magnetic field, rapidly and randomly
+changes direction. Nevertheless, we demonstrate analytically and via a physical
+argument why the combination of the two effects described above produces a
+finite magnetization along the axis of rotation. This manifests as a measurable
+spin-voltage in the range of tens of microvolts.",2107.03392v2
+2021-07-08,Emergence of Unconventional Interfacial Magnetic Phenomenon in Topological Insulator-Based Magnetic Heterostructures,"In a topological insulator (TI)/magnetic insulator (MI) hetero-structure,
+large spin-orbit coupling of the TI and inversion symmetry breaking at the
+interface could foster non-planar spin textures such as skyrmions at the
+interface. This is observed as topological Hall effect in a conventional Hall
+set-up. While this effect has been observed at the interface of TI/MI, where MI
+beholds perpendicular magnetic anisotropy, non-trivial spin-textures that
+develop in interfacial MI with in-plane magnetic anisotropy is under-reported.
+In this work, we study Bi$_2$Te$_3$/EuS hetero-structure using planar Hall
+effect (PHE). We observe planar topological Hall and spontaneous planar Hall
+features that are characteristic of non-trivial in-plane spin textures at the
+interface. We find that the latter is minimum when the current and magnetic
+field directions are aligned parallel, and maximum when they are aligned
+perpendicularly within the sample plane, which maybe attributed to the
+underlying planar anisotropy of the spin-texture. These results demonstrate the
+importance of PHE for sensitive detection and characterization of non-trivial
+magnetic phase that has evaded exploration in the TI/MI interface.",2107.03596v2
+2021-08-17,Spin-polarized Majorana zero-modes in double zigzag honeycomb nanoribbons,"We study the emergence of Majorana zero modes (MZMs) at the ends of a finite
+double zigzag honeycomb nanoribbon (zHNR). We show that a double zHNR geometry
+can host spin-polarized MZMs at its ends. We considered a minimal model
+composed by first nearest neighbor hopping, Rashba spin-orbit coupling (RSOC),
+p-wave superconducting pairing, and an applied external magnetic field (EMF).
+The energy spectrum regions with either spin up or down MZMs belong to distinct
+topological phase transitions characterized by their corresponding winding
+numbers and can be accessed by tunning the chemical potential of the
+nanoribbons. Hybrid systems constituted by zHNRs deposited on conventional
+s-wave superconductors are potential candidates for experimentally realizing
+the proposal. The spin's discrimination of MZMs suggests a possible route for
+performing topological-conventional qubit operations using Majorana
+spintronics.",2108.07785v1
+2021-08-18,The temperature-dependent chiral-induced spin selectivity effect: Experiments and theory,"The theoretical explanation for the chiral-induced spin selectivity effect,
+in which electrons' passage through a chiral system depends on their spin and
+the handedness of the system, remains vague. Although most experimental work
+was performed at room temperature, most of the proposed theories did not
+include vibrations. Here, we present temperature-dependent experiments and a
+theoretical model that captures all observations and provides spin polarization
+values that are consistent with the experimental results. The model includes
+vibrational contribution to the spin orbit coupling. It shows the importance of
+dissipation and the relation between the effect and the optical activity.",2108.08037v1
+2021-08-19,"IrCrMnZ (Z=Al, Ga, Si, Ge) Heusler alloys as electrode materials for MgO-based magnetic tunneling junctions: A first-principles study","We study IrCrMnZ (Z=Al, Ga, Si, Ge) systems using first-principles
+calculations from the perspective of their application as the electrode
+materials of MgO-based MTJs. These materials have highly spin-polarized
+conduction electrons with partially occupied $\Delta_1$ band, which is
+important for coherent tunneling in parallel magnetization configuration. The
+Curie temperatures of IrCrMnAl and IrCrMnGa are very high (above 1300 K) as
+predicted from mean-field-approximation. The stability of ordered phase against
+various antisite disorders has been investigated. We discuss here the effect of
+""spin-orbit-coupling"" on the electronic structure around Fermi level. Further,
+we investigate the electronic structure of IrCrMnZ/MgO heterojunction along
+(001) direction. IrCrMnAl/MgO and IrCrMnGa/MgO maintain half-metallicity even
+at the MgO interface, with no interfacial states at/around Fermi level in the
+minority-spin channel. Large majority-spin conductance of IrCrMnAl/MgO/IrCrMnAl
+and IrCrMnGa/MgO/IrCrMnGa is reported from the calculation of ballistic
+spin-transport property for parallel magnetization configuration. We propose
+IrCrMnAl/MgO/IrCrMnAl and IrCrMnGa/MgO/IrCrMnGa as promising MTJs with a weaker
+temperature dependence of tunneling magnetoresistance ratio, owing to their
+very high Curie temperatures.",2108.08501v1
+2021-09-16,Magnetoelectric polarizability and optical activity: spin and frequency dependence,"We extend a microscopic theory of polarization and magnetization to include
+the spin degree of freedom of the electrons, introducing a general spin orbit
+coupling and Zeeman interaction term in the Hamiltonian. At finite frequencies
+and including spin, the magnetoelectric polarizability tensor is replaced by
+two separate tensors, one that relates the polarization \textbf{P} to the
+magnetic field \textbf{B} and a separate tensor that relates the magnetization
+\textbf{M} to the electric field \textbf{E}. When combined with other relevant
+response tensors a third rank tensor that relates the induced current density
+to gradients in the electric field can be introduced; it is gauge invariant, in
+a form suitable for numerical calculations, and describes optical activity --
+including spin effects -- even in materials that may lack time reversal
+symmetry.",2109.07997v3
+2021-10-04,Transmission of a single electron through a Berry's ring,"A theoretical model of transmission and reflection of an electron with spin
+is proposed for a mesoscopic ring with rotating localized magnetic moment. This
+model may be realized in a pair of domain walls connecting two ferromagnetic
+domains with opposite magnetization. If the localized magnetic moment and the
+traveling spin is ferromagnetically coupled and if the localized moment rotates
+with opposite chirality in the double-path, our system is formulated in the
+model of an emergent spin-orbit interaction in a ring. The scattering problem
+for the transmission spectrum of the traveling spin is solved both in a single
+path and a double path model. In the double path, the quantum-path interference
+changes dramatically the transmission spectrum due to the effect of the Berry's
+phase. Specifically, the spin-flip transmission and reflection are both
+strictly forbidden.",2110.01472v2
+2021-10-11,Antiferromagnetic spin fluctuations and superconductivity in NbRh$_2$B$_2$ and TaRh$_2$B$_2$ with a chiral crystal structure,"We report the $^{11}$B nuclear magnetic resonance (NMR) measurements on
+non-centrosymmetric superconductors NbRh$_2$B$_2$ (superconducting transition
+temperature $T_c$ = 7.8 K) and TaRh$_2$B$_2$ ($T_c$ = 5.9 K) with a chiral
+crystal structure. The nuclear spin-lattice relaxation rate $1/T_1$ shows no
+coherence peak below $T_{\rm c}$, which suggests unconventional nature of the
+superconductivity. In the normal state, $1/T_1T$ increases with decreasing
+temperature $T$ at low temperatures below $T$ = 200 K for TaRh$_2$B$_2$ and $T$
+= 15 K for NbRh$_2$B$_2$, while the Knight shift remains constant. These
+results suggest the presence of antiferromagnetic spin fluctuations in both
+compounds. The stronger spin fluctuations in TaRh$_2$B$_2$ compared to
+NbRh$_2$B$_2$ is discussed in the context of spin-orbit coupling.",2110.04958v2
+2021-11-01,Sr$_3$LiIrO$_6$: a potential quantum spin liquid candidate in the one dimensional $d^4$ iridate family,"Spin-orbit coupling (SOC) offers a large variety of novel and extraordinary
+magnetic and electronic properties in otherwise `ordinary pool' of heavy ion
+oxides. Here we present a detailed study on an apparently isolated hexagonal
+2$H$ spin-chain $d^4$ iridate Sr$_3$LiIrO$_6$ (SLIO) with geometric
+frustration. Our structural studies clearly reveal perfect Li-Ir chemical order
+in this compound. Our combined experimental and {\it ab-initio} electronic
+structure investigations establish a magnetic ground state with finite
+Ir$^{5+}$ magnetic moments in this compound, contrary to the anticipated
+nonmagnetic $J$=0 state. Furthermore, the dc magnetic susceptibility ($\chi$),
+heat capacity ($C_p$) and spin-polarized density functional theory (DFT)
+studies unravel that despite having noticeable antiferromagnetic correlation
+among the Ir$^{5+}$ local moments, this SLIO system evades any kind of magnetic
+ordering down to at least 2 K due to geometrical frustration, arising from the
+comparable interchain Ir-O-O-Ir superexchange interaction strengths, hence
+promoting SLIO as a potential quantum spin liquid candidate.",2111.00925v1
+2022-05-20,Microscopic analysis of spin-momentum locking on a geometric phase metasurface,"We revisit spin-orbit coupling in a plasmonic Berry metasurface comprised of
+rotated nanoapertures, which is known to imprint a robust far-field
+polarization response. We present a scattering formalism that shows how that
+spin-momentum locking emerges from the geometry of the unit cell without
+requiring global rotation symmetries. We find and confirm with Mueller
+polarimetry measurements that spin-momentum locking is an approximate symmetry.
+The symmetry breakdown is ascribed to the elliptical projection of circularly
+polarized light into the planar surface. This breakdown is maximal when surface
+waves are excited, and a new set of spin-momentum locking rules is presented
+for this case.",2205.10245v2
+2022-06-01,Transient spin injection efficiencies at ferromagnet/metal interfaces,"Spin injection across interfaces driven by ultrashort optical pulses on
+femtosecond timescales constitutes a new way to design spintronics
+applications. Targeted utilization of this phenomenon requires knowledge of the
+efficiency of non-equilibrium spin injection. From a quantitative comparison of
+ab-initio time-dependent density functional theory and interface-sensitive,
+time-resolved non-linear optical experiment, we determine the spin injection
+efficiencies (SIE) across ferromagnetic/metal interfaces and discuss their
+microscopic origin, i.e. the influence of spin-orbit coupling and the interface
+electronic structure. Moreover, we find that the SIE can be optimized through
+laser pulse and materials parameters, namely the fluence, pulse duration, and
+substrate material.",2206.00498v1
+2022-09-21,Cross effects in spin hydrodynamics: A revisit Entropy analysis and statistical operator,"We revisit the construction of first-order spin hydrodynamics and find that
+the constitution relations receive the corrections from the cross effects
+resulting from spin-orbit coupling. Starting from a routine entropy analysis,
+we show how to identify cross effects and new cross transport coefficients from
+the second law of thermodynamics. Interestingly, the conventional transport
+coefficient heat conductivity $\kappa$ is bounded from below by the product of
+cross transport coefficients, which means the threshold of heat conduction is
+changed. With recourse to Zubarev's non-equilibrium statistical operator, we
+reproduce the construction of first-order spin hydrodynamics and identification
+of cross effects in a more rigorous way. By seeking the dispersion relations of
+normal modes, we find that these cross effects suppress the attenuation of
+sound modes and heat mode appearing in conventional hydrodynamics and also have
+impacts on the damping of non-hydrodynamic spin modes.",2209.10979v2
+2022-09-23,Time-reversal symmetry adaptation in relativistic density matrix renormalization group algorithm,"In the nonrelativistic Schr\""{o}dinger equation, the total spin $S$ and spin
+projection $M$ are good quantum numbers. In contrast, spin symmetry is lost in
+the presence of spin-dependent interactions such as spin-orbit couplings in
+relativistic Hamiltonians. Previous implementations of relativistic density
+matrix renormalization group algorithm (R-DMRG) only employing particle number
+symmetry are much more expensive than nonrelativistic DMRG. Besides, artificial
+breaking of Kramers degeneracy can happen in the treatment of systems with odd
+number of electrons. To overcome these issues, we introduce time-reversal
+symmetry adaptation for R-DMRG. Since the time-reversal operator is
+antiunitary, this cannot be simply achieved in the usual way. We define a
+time-reversal symmetry-adapted renormalized basis and present strategies to
+maintain the structure of basis functions during the sweep optimization. With
+time-reversal symmetry adaptation, only half of the renormalized operators are
+needed and the computational costs of Hamiltonian-wavefunction multiplication
+and renormalization are reduced by half. The present construction of
+time-reversal symmetry-adapted basis also directly applies to other tensor
+network states without loops.",2209.11380v1
+2022-09-26,Real-space Obstruction in Quantum Spin Hall Insulators,"The recently introduced classification of two-dimensional insulators in terms
+of topological crystalline invariants has been applied so far to ""obstructed""
+atomic insulators characterized by a mismatch between the centers of the
+electronic Wannier functions and the ionic positions. We extend this notion to
+quantum spin Hall insulators in which the ground state cannot be described in
+terms of time-reversal symmetric localized Wannier functions. A system
+equivalent to graphene in all its relevant electronic and topological
+properties except for a real-space obstruction is identified and studied via
+symmetry analysis as well as with density functional theory. The low-energy
+model comprises a local spin-orbit coupling and a non-local symmetry breaking
+potential, which turn out to be the essential ingredients for an obstructed
+quantum spin Hall insulator. An experimental fingerprint of the obstruction is
+then measured in a large-gap triangular quantum spin Hall material.",2209.12915v1
+2022-10-06,Magnetic excitations in the helical Rashba superconductor,"We investigate the magnetic excitation spectrum in the helical state of a
+noncentrosymmetric superconductor with inversion symmetry breaking and strong
+Rashba spin-orbit coupling. For this purpose, we derive the general expressions
+of the dynamical spin response functions under the presence of strong Rashba
+splitting of conduction bands, superconducting gap, and external field which
+lead to stabilization of Cooper pairs with finite overall momentum in a helical
+state. The latter is characterized by momentum space regions of paired and
+unpaired states with different quasiparticle dispersions. The magnetic response
+is determined by i) excitations within and between both paired and unpaired
+regions ii) anomalous coherence factors and iii) additional spin matrix
+elements due to helical Rashba spin texture of bands. We show that as a
+consequence typical correlated real space and spin space anisotropies appear in
+the dynamical susceptibility which would be observable as a characteristic
+fingerprint for a helical superconducting state in inelastic neutron scattering
+investigations.",2210.03059v1
+2022-10-17,Spin Hall angle in single-layer graphene,"We investigate the spin Hall effect in a single-layer graphene device with
+disorder and interface-induced spin-orbit coupling. Our graphene device is
+connected to four semi-infinite leads that are embedded in a
+{Landauer-B\""uttiker} setup for quantum transport. We show that the spin Hall
+angle of graphene devices exhibits mesoscopic fluctuations that are similar to
+metal devices. Furthermore, the product between the {maximum spin Hall angle
+deviation} and dimensionless longitudinal conductivity follows a universal
+relationship $\Theta_{sH} \times \sigma = 0.18$. Finally, we compare the
+universal relation with recent experimental data and numerically exact
+real-space simulations from the tight-binding model.",2210.09393v1
+2022-12-08,Semiclassical analysis of Dirac fields on curved spacetime,"We present a semiclassical analysis for Dirac fields on an arbitrary
+spacetime background and in the presence of a fixed electromagnetic field. Our
+approach is based on a Wentzel-Kramers-Brillouin approximation, and the results
+are analyzed at leading and next-to-leading order in the small expansion
+parameter $\hbar$. Taking into account the spin-orbit coupling between the
+internal and external degrees of freedom of wave packets, we derive effective
+ray equations with spin-dependent terms. These equations describe the
+gravitational spin Hall effect of localized Dirac wave packets. We treat both
+massive and massless Dirac fields and show how a covariantly defined Berry
+connection and the associated Berry curvature govern the semiclassical
+dynamics. The gravitational spin Hall equations are shown to be particular
+cases of the Mathisson-Papapetrou equations for spinning objects.",2212.04414v2
+2023-01-08,Switchable Giant Bulk Photocurrents and Photo-spin-currents in Monolayer PT-symmetric Anti-ferromagnet MnPSe3,"Converting light into steady currents and spin-currents in two-dimensional
+(2D) platform is essential for future energy harvesting and spintronics. We
+show that the giant and modulable bulk photovoltaic effects (BPVEs) can be
+achieved in air-stable 2D antiferromagnet (AFM) monolayer MnPSe3, with
+nonlinear photoconductance > 4000 nm$\cdot\mu$A/V2 and photo-spin-conductance >
+2000 (nm$\cdot\mu$A/V2 $\hbar$/2e) in the visible spectrum. The propagation and
+the spin-polarizations of photocurrents can be switched via simply rotating the
+N$\'e$el vector. We unveil that the PT-symmetry, mirror symmetries, and
+spin-orbital-couplings are the keys for the observed sizable and controllable
+2D BPVEs. All the results provide insights into the BPVEs of 2D AFM, and
+suggest that the layered MnPSe3 is an outstanding 2D platform for energy device
+and photo-spintronics.",2301.02985v1
+2023-03-24,Andreev reflection in altermagnets,"Recent works have predicted materials featuring bands with a large
+spin-splitting distinct from ferromagnetic and relativistically spin-orbit
+coupled systems. Materials displaying this property are known as altermagnets
+and feature a spin-polarized band structure reminiscent of a $d$-wave
+superconducting order parameter. We here consider the contact between an
+altermagnet and a superconductor and determine how the altermagnetism affects
+the fundamental process of Andreev reflection. We show that the resulting
+charge conductance depends strongly on the interfacial orientation of the
+altermagnet relative to the superconductor, displaying features similar to
+normal metals or ferromagnets. The zero-bias conductance peak present at the
+interface in the $d$-wave case are robust toward the presence of an
+altermagnetic interaction. Moreover, the spin conductance strongly depends on
+the orientation of the altermagnet relative the interface. These results show
+how the anisotropic altermagnetic state can be probed by conductance
+spectroscopy and how it offers voltage control over charge and spin currents
+that are modulated due to superconductivity.",2303.14236v3
+2023-05-18,Assembling Kitaev honeycomb spin liquids from arrays of 1D symmetry protected topological phases,"The Kitaev honeycomb model, which is exactly solvable by virtue of an
+extensive number of conserved quantities, supports a gapless quantum spin
+liquid phase as well as gapped descendants relevant for fault-tolerant quantum
+computation. We show that the anomalous edge modes of 1D cluster-state-like
+symmetry protected topological (SPT) phases provide natural building blocks for
+a variant of the Kitaev model that enjoys only a subextensive number of
+conserved quantities. The symmetry of our variant allows a single additional
+nearest-neighbor perturbation, corresponding to an anisotropic version of the
+$\Gamma$ term studied in the context of Kitaev materials. We determine the
+phase diagram of the model using exact diagonalization. Additionally, we use
+DMRG to show that the underlying 1D SPT building blocks can emerge from a
+ladder Hamiltonian exhibiting only two-spin interactions supplemented by a
+Zeeman field. Our approach may inform a new pathway toward realizing Kitaev
+honeycomb spin liquids in spin-orbit-coupled Mott insulators.",2305.11221v1
+2023-09-25,The influence of antiferromagnetic spin cantings on the magnetic helix pitch in cubic helimagnets,"In cubic helimagnets MnSi and Cu2OSeO3 with their nearly isotropic magnetic
+properties, the magnetic structure undergoes helical deformation, which is
+almost completely determined by the helicoid wavenumber k = D / J, where
+magnetization field stiffness J is associated with isotropic spin exchange, and
+D is a pseudoscalar value characterizing the antisymmetric
+Dzyaloshinskii-Moriya (DM) interaction. While the wavenumber can be measured
+directly in a diffraction experiment, the values of J and D can be calculated
+from the constants of pair spin interactions, which enter as parameters into
+the Heisenberg energy. However, the available analytical expression for D,
+which is of the first order in the spin-orbit coupling (SOC), has significant
+problems with accuracy. Here we show that hardly observable distortions of the
+magnetic structure, namely the antiferromagnetic spin cantings, can
+significantly change the constant D in the next approximation in SOC, thus
+affecting the wavenumber of magnetic helicoids. The obtained analytical
+expressions agree with the results of numerical simulation of magnetic helices
+in Cu2OSeO3 to within a few percent.",2309.14480v1
+2023-12-01,Incommensurate Spiral Spin Order in CaMn$_2$Bi$_2$ observed via High Pressure Neutron Diffraction,"High pressure neutron diffraction is employed to investigate the magnetic
+behavior of CaMn$_2$Bi$_2$ in extreme conditions. In contrast to
+antiferromagnetic ordering on Mn atoms reported at ambient pressure, our
+results reveal that at high pressure, incommensurate spiral spin order emerges
+due to the interplay between magnetism on the Mn atoms and strong spin-orbit
+coupling on the Bi atoms: sinusoidal spin order is observed at pressures as
+high as 7.4 GPa. Competing antiferromagnetic order is observed at different
+temperatures in the partially frustrated lattice. This research provides a
+unique toolbox for conducting experimental magnetic and spin dynamics studies
+on magnetic quantum materials via high pressure neutron diffraction.",2312.00397v1
+2024-01-16,Spin Waves in Ferrimagnets near the Angular Magnetization Compensation Temperature: A Micromagnetic Study,"Spin wave propagation along a ferrimagnetic strip with out-of-plane
+magnetization is studied by means of micromagnetic simulations. The
+ferrimagnetic material is considered as formed by two antiferromagnetically
+coupled sublattices. Two critical temperatures can be defined for such systems:
+that of magnetization compensation and that of angular momentum compensation,
+both different due to distinct Land\'e factors for each sub-lattice. Spin waves
+in the strip are excited by a spin current injected at one of its edges. The
+obtained dispersion diagrams show exchange-dominated forward volume spin waves.
+For a given excitation frequency, N\'eel vector describes highly eccentric
+orbits, the eccentricity depending on temperature, whose semi-major axis are
+oriented differently at distinct locations on the FiM strip.",2401.08235v1
+2006-07-25,The Structure of Hydrated Electron. Part 1. Magnetic Resonance of Internally Trapping Water Anions: A Density Functional Theory Study,"Density functional theory (DFT) is used to rationalize magnetic parameters of
+hydrated electron trapped in alkaline glasses as observed using Electron
+Paramagnetic Resonance (EPR) and Electron Spin Echo Envelope Modulation (ESEEM)
+spectroscopies. To this end, model water cluster anions (n=4-8 and n=20,24)
+that localize the electron internally are examined. It is shown that EPR
+parameters of such water anions (such as hyperfine coupling tensors of H/D
+nuclei in the water molecules) are defined mainly by the cavity size and the
+coordination number of the electron; the water molecules in the second
+solvation shell play a relatively minor role. An idealized model of hydrated
+electron (that is usually attributed to L. Kevan) in which six hydroxyl groups
+arranged in an octahedral pattern point towards the common center is shown to
+provide the closest match to the experimental parameters, such as isotropic and
+anisotropic hyperfine coupling constants for the protons (estimated from
+ESEEM), the second moment of the EPR spectra, and the radius of gyration. The
+salient feature of these DFT models is the significant transfer (10-20%) of
+spin density into the frontal O 2p orbitals of water molecules. Spin bond
+polarization involving these oxygen orbitals accounts for small, negative
+hyperfine coupling constants for protons in hydroxyl groups that form the
+electron-trapping cavity. In Part 2, these results are generalized for more
+realistic geometries of core anions obtained using a dynamic one-electron mixed
+qunatum/classical molecular dynamics model.",0607228v1
+2012-10-29,Interaction proximity effect at the interface between a superconductor and a topological insulator quantum well,"A material whose electrons are correlated can affect electron dynamics across
+the interface with another material. Such a ""proximity effect"" can have several
+manifestations, from order parameter leakage to generated effective
+interactions. The resulting combination of induced electron correlations and
+their intrinsic dynamics at the surface of the affected material can give rise
+to qualitatively new quantum states. For example, the leaking of a
+superconducting order parameter into certain Rashba spin-orbit-coupled
+materials has been recently identified as a path to creating ""topological
+superconductors"" that can host Majorana particles of use in quantum computing.
+Here we analyze the other aspects of the superconducting proximity effect. The
+proximity-induced interactions are a promising path to incompressible quantum
+liquids with non-Abelian fractional quasiparticles in topological insulator
+quantum wells, which could also find applications in topological quantum
+computing. We discuss the operational and design principles of a
+heterostructure device that could realize such states. We apply
+field-theoretical methods to characterize the properties of induced
+interactions via the electron-phonon coupling and Cooper pair tunneling across
+the interface. We argue that bound-state Cooper pairs can be stabilized by the
+interaction proximity effect inside a topological insulator quantum well at
+experimentally observable energy scales. The condensation of spinful triplet
+pairs, enabled by the Rashba spin-orbit coupling and tunable by gate voltage,
+would lead to novel superconducting states and fractional topological
+insulators.",1210.7821v2
+2015-05-19,Stanene: Atomically Thick Free-standing Layer of 2D Hexagonal Tin,"Two dimensional (2D) layered materials have recently gained renewed interest
+due to their exotic electronic properties along with high specific surface
+area. The prospects of exploiting these properties in sensing, catalysis,
+energy storage, protective coatings and electrochromism have witnessed a
+paradigm shift towards the exploration of these sophisticated 2D materials. The
+exemplary performance of graphene (1) which is among the first of these
+elemental 2D materials have initiated a runaway effect in the pursuit of
+studying alternative 2D materials. Even though graphene has tunable exotic
+electronic properties (2), the spin-orbit (SO) coupling is weak (3) limiting
+its applications as spin filters, topological insulators etc. Topological
+insulators by their very nature force the electrons to travel on the surface at
+very high speeds thereby finding useful applications in electronic and photonic
+devices. Exploration of group IV elements using first principles calculations
+have revealed that the SO coupling increases as the atomic weight of the basis
+atoms in the honeycomb lattice (4). Tin is one of the heaviest elements in this
+series having strong spin-orbit coupling making it a promising applicant for
+room temperature topological insulator. Thus there is an urgent need to
+discover novel 2D materials in the post graphene age to overcome its
+deficiencies. We have synthesized and investigated the optical transitions in
+2D material referred to as few-layer stanene (FLS). These are analogous to
+few-layer graphene and can be visualized by replacing carbon atoms by tin on a
+graphene lattice. We have been able to synthesize from mono to few atomic
+layers of free standing stanene and characterize them optically using UV-Vis
+absorption, Raman and photoluminescence spectroscopy. First principles
+calculations have been performed to interpret experimental results.",1505.05062v1
+2020-12-24,Energy scales in 4f1 delafossite magnets: crystal-field splittings larger than the strength of spin-orbit coupling in KCeO2,"Ytterbium-based delafossites with effective S=1/2 moments are investigated
+intensively as candidates for quantum spin-liquid ground states. While the
+synthesis of related cerium compounds has also been reported,many important
+details concerning their crystal, electronic, and magnetic structures are
+unclear. Here we analyze the S=1/2 system KCeO2, combining complementary
+theoretical methods. The lattice geometry was optimized and the band structure
+investigated using density functional theory extended to the level of a GGA+U
+calculation in order to reproduce the correct insulating behavior. The Ce 4f1
+states were then analyzed in more detail with the help of ab initio
+wave-function-based computations. Unusually large effective crystal-field
+splittings of up to 320 meV are predicted, which puts KCeO2 in the strong field
+coupling regime. Our results reveal a subtle interplay between ligand-cage
+electrostatics and the trigonal field generated by the extended crystalline
+surroundings, relevant in the context of recent studies on tuning the nature of
+the ground-state wave function in 4f triangular-lattice and pyrochlore
+compounds. It also makes KCeO2 an interesting model system in relation to the
+effect of large crystal-field splittings on the anisotropy of intersite
+exchange in spin-orbit coupled quantum magnets.",2012.13174v1
+2018-07-04,"Spin-orbit coupling driven insulating state in hexagonal iridates Sr3MIrO6 (M = Sr, Na and Li)","The spin-orbit coupling (SOC) interactions, electron correlation effects and
+Hund coupling cooperate and compete with each other, leading to novel
+properties, quantum phase and non-trivial topological electronic behavior in
+iridium oxides. Because of the well separated IrO6 octahedra approaching cubic
+crystal-field limit, the hexagonal iridates Sr3MIrO6 (M = Sr, Na and Li) serves
+as a canonical model system to investigate the underlying physical properties
+that arises from the novel Jeff state. Based on density functional theory
+calculations complemented by Green's function methods, we systematically
+explore the critical role of SOC on the electronic structure and magnetic
+properties of Sr3MIrO6. The crystal-field splitting combined with correlation
+effects are insufficient to account for the insulating nature, but the SOC
+interactions is the intrinsic source to trigger the insulating ground states in
+these hexagonal iridates. The decreasing geometry connectivity of IrO6
+octahedra gives rise to the increasing of effective electronic correlations and
+SOC interactions, tuning the hexagonal iridates from low-spin Jeff = 1/2 states
+with large local magnetic moments for the Ir4+ (5d5) ions in Sr4IrO6 to
+nonmagnetic singlet Jeff = 0 states without magnetic moments for the Ir5+ (5d4)
+ions in Sr3NaIrO6 and Sr3LiIrO6. The theoretical calculated results are in good
+agreement with available experimental data, and explain the magnetic properties
+of Sr3MIrO6 well.",1807.01807v1
+2020-11-17,Competing energy scales in topological superconducting heterostructures,"Artificially engineered topological superconductivity has emerged as a viable
+route to create Majorana modes, exotic quasiparticles which have raised great
+expectations for storing and manipulating information in topological quantum
+computational schemes. The essential ingredients for their realization are spin
+non-degenerate metallic states proximitized to an s-wave superconductor. In
+this context, proximity-induced superconductivity in materials with a sizable
+spin-orbit coupling has been heavily investigated in recent years. Although
+there is convincing evidence that superconductivity may indeed be induced, it
+has been difficult to elucidate its topological nature. In this work, we
+systematically engineer an artificial topological superconductor by
+progressively introducing superconductivity (Nb) into metals with strong
+spin-orbital coupling (Pt) and 3D topological surface states (Bi2Te3). Through
+a longitudinal study of the character of superconducting vortices within s-wave
+superconducting Nb and proximity-coupled Nb/Pt and Nb/Bi2Te3, we detect the
+emergence of a zero-bias peak that is directly linked to the presence of
+topological surface states. Supported by a detailed theoretical model, our
+results are rationalized in terms of competing energy trends which are found to
+impose an upper limit to the size of the minigap separating Majorana and
+trivial modes, its size being ultimately linked to fundamental materials
+properties.",2011.08812v1
+2017-07-26,High-buckled R3 stanene with topologically nontrivial energy gap,"Stanene has been predicted to be a two-dimensional topological insulator
+(2DTI). Its low-buckled atomic geometry and the enhanced spin-orbit coupling
+are expected to cause a prominent quantum spin hall (QSH) effect. However, most
+of the experimentally grown stanene to date displays a metallic state without a
+real gap, possibly due to the chemical coupling with the substrate and the
+stress applied by the substrate. Here,we demonstrate an efficient way of tuning
+the atomic buckling in stanene to open a topologically nontrivial energy gap.
+Via tuning the growth kinetics, we obtain not only the low-buckled 1x1 stanene
+but also an unexpected high-buckled R3xR3 stanene on the Bi(111) substrate.
+Scanning tunneling microscopy (STM) study combined with density functional
+theory (DFT) calculation confirms that the R3xR3 stanene is a distorted 1x1
+structure with a high-buckled Sn in every three 1x1 unit cells. The
+high-buckled R3xR3 stanene favors a large band inversion at the {\Gamma} point,
+and the spin orbital coupling open a topologically nontrivial energy gap. The
+existence of edge states as verified in both STM measurement and DFT
+calculation further confirms the topology of the R3xR3 stanene. This study
+provides an alternate way to tune the topology of monolayer 2DTI materials.",1707.08657v1
+2018-04-30,Networks of Coadjoint Orbits: from Geometric to Statistical Mechanics,"A class of network models with symmetry group $G$ that evolve as a
+Lie-Poisson system is derived from the framework of geometric mechanics, which
+generalises the classical Heisenberg model studied in statistical mechanics. We
+considered two ways of coupling the spins: one via the momentum and the other
+via the position and studied in details the equilibrium solutions and their
+corresponding nonlinear stability properties using the energy-Casimir method.
+We then took the example $G=SO(3)$ and saw that the momentum-coupled system
+reduces to the classical Heisenberg model with massive spins and the
+position-coupled case reduces to a new system that has a broken symmetry group
+$SO(3)/SO(2)$ similar to the heavy top. In the latter system, we numerically
+observed an interesting synchronisation-like phenomenon for a certain class of
+initial conditions. Adding a type of noise and dissipation that preserves the
+coadjoint orbit of the network model, we found that the invariant measure is
+given by the Gibbs measure, from which the notion of temperature is defined. We
+then observed a surprising `triple-humped' phase transition in the heavy
+top-like lattice model, where the spins switched from one equilibrium position
+to another before losing magnetisation as we increased the temperature. This
+work is only a first step towards connecting geometric mechanics with
+statistical mechanics and several interesting problems are open for further
+investigation.",1804.11139v1
+2015-12-13,Hermitian spin-orbit Hamiltonians on a surface in orthogonal curvilinear coordinates: a new practical approach,"The Hermitian Hamiltonian of a spin one-half particle with spin-orbit
+coupling (SOC) confined to a surface that is embedded in a three-dimensional
+space spanned by a general Orthogonal Curvilinear Coordinate (OCC) is
+constructed. A gauge field formalism, where the SOC is expressed as a
+non-Abelian $SU(2)$ gauge field is used. A new practical approach, based on the
+physical argument that upon confining the particle to the surface by a
+potential, then it is the physical Hermitian momentum operator transverse to
+the surface, rather than just the derivative with respect to the transverse
+coordinate that should be dropped from the Hamiltonian.Doing so, it is shown
+that the Hermitian Hamiltonian for SOC is obtained with the geometric potential
+and the geometric kinetic energy terms emerging naturally. The geometric
+potential is shown to represent a coupling between the transverse component of
+the gauge field and the mean curvature of the surface that replaces the
+coupling between the transverse momentum and the gauge field. The most general
+Hermitian Hamiltonian with linear SOC on a general surface embedded in any 3D
+OCC system is reported. Explicit plug-and-play formulae for this Hamiltonian on
+the surfaces of a cylinder, a sphere and a torus are given. The formalism is
+applied to the Rashba SOC in three dimensions (3D RSOC) and the explicit
+expressions for the surface Hamiltonians on these three geometries are worked
+out.",1512.08719v1
+2017-10-18,Models of spin-orbit coupled oligomers,"We address the stability and dynamics of eigenmodes in linearly-shaped
+strings (dimers, trimers, tetramers, and pentamers) built of droplets of a
+binary Bose-Einstein condensate (BEC). The binary BEC is composed of atoms in
+two pseudo-spin states with attractive interactions, dressed by properly
+arranged laser fields, which induce the (pseudo-) spin-orbit (SO) coupling. We
+demonstrate that the SO-coupling terms help to create eigenmodes of particular
+types in the strings. Dimer, trimer, and pentamer eigenmodes of the linear
+system, which correspond to the zero eigenvalue (EV, alias chemical potential)
+extend into the nonlinear ones, keeping an exact analytical form, while
+tetramers do not admit such a continuation, because the respective spectrum
+does not contain a zero EV. Stability areas of these modes shrink with the
+increasing nonlinearity. Besides these modes, other types of nonlinear states,
+which are produced by the continuation of their linear counterparts
+corresponding to some nonzero EVs, are found in a numerical form (including
+ones for the tetramer system). They are stable in nearly entire existence
+regions in trimer and pentamer systems, but only in a very small area for the
+tetramers. Similar results are also obtained, but not displayed in detail, for
+hexa- and septamers.",1710.06802v1
+2020-02-27,Controlling in-gap end states by linking nonmagnetic atoms and artificially-constructed spin chains on superconductors,"Chains of magnetic atoms with either strong spin-orbit coupling or spiral
+magnetic order which are proximity-coupled to superconducting substrates can
+host topologically non-trivial Majorana bound states. The experimental
+signature of these states consists of spectral weight at the Fermi energy and
+spatially localized near the ends of the chain. However, topologically trivial
+Yu-Shiba-Rusinov in-gap states localized near the ends of the chain can lead to
+similar spectra. Here, we explore a protocol to disentangle these contributions
+by artificially augmenting a candidate Majorana spin chain with
+orbitally-compatible nonmagnetic atoms. Combining scanning tunneling
+spectroscopy with ab-initio and tight-binding calculations, we realize a sharp
+spatial transition between the proximity-coupled spiral magnetic order and the
+non-magnetic superconducting wire termination, with persistent zero-energy
+spectral weight localized at either end of the magnetic spiral. Our findings
+open a new path towards the control of the spatial position of in-gap end
+states, trivial or Majorana, via different chain terminations, and the
+realization of designer Majorana chain networks for demonstrating topological
+quantum computation.",2002.12294v2
+2019-12-16,Stable multi-peak vector solitons in spin-orbit coupled spin-1 polar condensates,"We demonstrate the formation of multi-peak three-component stationary stripe
+vector solitons in a quasi-one-dimensional spin-orbit-coupled hyper-fine spin
+$F = 1$ polar Bose-Einstein condensate. The present investigation is carried
+out through a numerical solution by imaginary-time propagation and an analytic
+variational approximation of the underlying mean-field Gross-Pitaevskii
+equation. Simple analytic results for energy and component densities were found
+to be in excellent agreement with the numerical results for solitons with more
+than 100 pronounced maxima and minima. The vector solitons are one of the two
+types: dark-bright-dark or bright-dark-bright. In the former a maximum density
+in component $ F_z = 0 $ at the center is accompanied by a zero in components
+$F_z = \pm 1$. The opposite happens in the latter case. The vector solitons are
+demonstrated to be mobile and dynamically stable. The collision between two
+such vector solitons is found to be quasi elastic at large velocities with the
+conservation of total density of each vector soliton. However, at very small
+velocity, the collision is inelastic with a destruction of the initial vector
+solitons. It is possible to observe and study the predicted SO-coupled vector
+solitons in a laboratory.",1912.07675v1
+2016-12-15,Heisenberg and Dzyaloshinskii-Moriya interactions controlled by molecular packing in tri-nuclear organometallic clusters,"Motivated by recent synthetic and theoretical progress we consider magnetism
+in crystals of multi-nuclear organometallic complexes. We calculate the
+Heisenberg symmetric exchange and the Dzyaloshinskii-Moriya antisymmetric
+exchange. We show how, in the absence of spin-orbit coupling, the interplay of
+electronic correlations and quantum interference leads to a quasi-one
+dimensional effective spin model in a typical tri-nuclear complex,
+Mo$_3$S$_7$(dmit)$_3$, despite its underlying three dimensional band structure.
+We show that both intra- and inter-molecular spin-orbit coupling can cause an
+effective Dzyaloshinskii-Moriya interaction. Furthermore, we show that, even
+for an isolated pair of molecules the relative orientation of the molecules
+controls the nature of the Dzyaloshinskii-Moriya coupling. We show that
+interference effects also play a crucial role in determining the
+Dzyaloshinskii-Moriya interaction. Thus, we argue, that multi-nuclear
+organometallic complexes represent an ideal platform to investigate the effects
+of Dzyaloshinskii-Moriya interactions on quantum magnets.",1612.04926v3
+2022-02-23,Secular Spin-orbit Resonances of Black Hole Binaries in AGN Disks,"The spin-orbit misalignment of stellar-mass black hole (sBH) binaries provide
+important constraints on the formation channels of merging sBHs. Here, we study
+the role of secular spin-orbit resonance in the evolution of a sBH binary
+component around a supermassive BH (SMBH) in an AGN disk. We consider the sBH's
+spin-precession due to the $J_2$ moment introduced by a circum-sBH disk within
+the warping/breaking radius of the disk. We find that the sBH's spin-orbit
+misalignment (obliquity) can be excited via spin-orbit resonance between the
+sBH binary's orbital nodal precession and the sBH spin-precession driven by a
+massive circum-sBH disk. Using an $\alpha$-disk model with
+Bondi-Hoyle-Lyttleton accretion, the resonances typically occur for sBH
+binaries with semi-major axis of $1$AU, and at a distance of $\sim 1000$AU
+around a $10^7$\msun SMBH. The spin-orbit resonances can lead to high sBH
+obliquities, and a broad distribution of sBH binary spin-spin misalignments.
+However, we note that the Bondi-Hoyle-Lyttleton accretion is much higher than
+that of Eddington accretion, which typically results in spin precession being
+too low to trigger spin-orbit resonances. Thus, the secular spin-orbit
+resonances can be quite rare for sBHs in AGN disks.",2202.11739v2
+1996-10-15,Interlayer exchange coupling in Fe/Cr multilayers,"We investigate the origin of the long period oscillation of the interlayer
+exchange coupling in Fe/Cr trilayer systems. Within the stationary phase
+approximation the periods of the oscillations are associated with extremal
+vectors of the Fermi sphere of Cr. Using a realistic tight-binding model with
+spin-orbit interaction we calculate the coupling strength for each extremal
+vector based on the spin-asymmetry of the reflection amplitude for a
+propagating state impinging from the Cr to Fe layer. We find that for (001) and
+(110) growth direction the biggest coupling strength comes from the extremal
+vector centered at the ellipsoid N of the Fermi surface of Cr.",9610121v1
+2006-10-19,Dzyaloshinsky-Moriya antisymmetric exchange coupling in cuprates: Oxygen effects,"We revisit a problem of Dzyaloshinsky-Moriya antisymmetric exchange coupling
+for a single bond in cuprates specifying the local spin-orbital contributions
+to Dzyaloshinsky vector focusing on the oxygen term. The Dzyaloshinsky vector
+and respective weak ferromagnetic moment is shown to be a superposition of
+comparable and, sometimes, competing local Cu and O contributions. The
+intermediate oxygen $^{17}$O Knight shift is shown to be an effective tool to
+inspect the effects of Dzyaloshinsky-Moriya coupling in an external magnetic
+field. We predict the effect of $strong$ oxygen weak antiferromagnetism in
+edge-shared CuO$_2$ chains due to uncompensated oxygen Dzyaloshinsky vectors.
+Finally, we revisit the effects of symmetric spin anisotropy, in particular,
+those directly induced by Dzyaloshinsky-Moriya coupling.",0610537v1
+2012-06-26,Temperature dependence of electronic transport through molecular magnets in the Kondo regime,"The effects of finite temperature in transport through nanoscopic systems
+exhibiting uniaxial magnetic anisotropy D, such as molecular magnets, adatoms,
+or quantum dots side-coupled to a large spin are analyzed in the Kondo regime.
+The linear-response conductance is calculated by means of the full
+density-matrix numerical renormalization group method as a function of
+temperature T, magnetic anisotropy D, and exchange coupling J between the
+molecule's core spin and the orbital level. It is shown that such system
+displays a two-stage Kondo effect as a function of temperature and a quantum
+phase transition as a function of the exchange coupling J. Moreover, additional
+peaks are found in the linear conductance for temperatures of the order of
+T\sim|J| and T\simD. It is also shown that the conductance variation with T
+remarkably depends on the sign of the exchange coupling J.",1206.6069v2
+2012-10-01,Magnetic impurities in graphane with dehydrogenated channels,"We have investigated the electronic and magnetic response of a single Fe atom
+and a pair of interacting Fe atoms placed in patterned dehydrogenated channels
+in graphane within the framework of density functional theory. We have
+considered two channels: ""armchair"" and ""zigzag"" channels. Fully relaxed
+calculations have been carried out for three different channel widths. Our
+calculations reveal that the response to the magnetic impurities is very
+different for these two channels. We have also shown that one can stabilize
+magnetic impurities (Fe in the present case) along the channels of bare carbon
+atoms, giving rise to a magnetic insulator or a spin gapless semiconductor. Our
+calculations with spin-orbit coupling shows a large in-plane magnetic
+anisotropy energy for the case of the armchair channel. The magnetic exchange
+coupling between two Fe atoms placed in the semiconducting channel with an
+armchair edge is very weakly ferromagnetic whereas a fairly strong
+ferromagnetic coupling is observed for reasonable separations between Fe atoms
+in the zigzag-edged metallic channel with the coupling mediated by the bare
+carbon atoms. The possibility of realizing an ultrathin device with interesting
+magnetic properties is discussed.",1210.0465v2
+2012-01-19,Emergence of Chiral Magnetism in Spinor Bose-Einstein Condensate with Rashba Coupling,"Hydrodynamic theory of the spinor BEC condensate with Rashba spin-orbit
+coupling is presented. A close mathematical analogy of the Rashba-BEC model to
+the recently developed theory of chiral magnetism is found. Hydrodynamic
+equations for mass density, superfluid velocity, and the local magnetization
+are derived. The mass current is shown to contain an extra term proportional to
+the magnetization direction, as a result of the Rashba coupling. Elementary
+excitations around the two known ground states of the Rashba-BEC Hamiltonian,
+the plane-wave and the stripe states, are worked out in the hydrodynamic
+framework, highlighting the cross-coupling of spin and superflow velocity
+excitations due to the Rashba term.",1201.3958v2
+2014-06-12,Ferrimagnetism in the double perovskite Ca2FeOsO6: a density functional study,"Using density functional calculations, we find that the newly synthesized
+Ca$_2$FeOsO$_6$ has the high-spin Fe$^{3+}$ ($3d^5$)-Os$^{5+}$ ($5d^3$) state.
+The octahedral Os$^{5+}$ ion has a large intrinsic exchange splitting, and its
+$t_{2g\uparrow}^3$ configuration makes the spin-orbit coupling ineffective.
+Moreover, there is a strong antiferromagnetic (AF) coupling between the
+neighboring Fe$^{3+}$ ($S$ = 5/2) and Os$^{5+}$ ($S$ = -3/2), but the AF
+couplings within both the fcc Fe$^{3+}$ and Os$^{5+}$ sublattices are one order
+of magnitude weaker. Therefore, a magnetic frustration is suppressed and a
+stable ferrimagnetic (FiM) ground state appears. This FiM order is due to the
+virtual hopping of the $t_{2g}$ electrons from Os$^{5+}$ ($t_{2g\downarrow}^3$)
+to Fe$^{3+}$ ($t_{2g\uparrow}^3e_{g\uparrow}^2$). However, if the experimental
+bended Fe$^{3+}$-O$^{2-}$-Os$^{5+}$ exchange path gets straight, the $e_g$
+hopping from Fe$^{3+}$ ($t_{2g\uparrow}^3e_{g\uparrow}^2$) to Os$^{5+}$
+($t_{2g\uparrow}^3$) would be facilitated and then a ferromagnetic (FM)
+coupling would occur.",1406.3101v1
+2016-12-04,Massless Dirac-like fermions under external fields: a nonminimal coupling approach,"We investigate the unusual properties of quasirelativistic massless fermions
+under a magnetic or electric field by means of nonminimal couplings. Within
+this approach, the spin-orbit coupling (SOC) effects are properly generated in
+the energy spectrum of the quasiparticles. By including a magnetic field, $B$,
+we show that the spin splitting of Landau Levels (LL) obeys a $\sqrt{B}$ linear
+dependence with SOC, typical of relativistic particles. Moreover, our
+calculated spectrum of LLs resembles the behavior of the three-dimensional (3D)
+massless Kane fermions. Using a nonminimal coupling with an external electric
+field, we demonstrate that a Rashba-like SOC naturally appears into the
+relativistic equations and apply to the case of two-dimensional (2D) massless
+Dirac fermions. Still considering our proposed approach, the Hall conductivity
+is also computed for the 2D case under transverse electric field both at zero
+and finite temperatures for a general chemical potential. The results feature a
+typical quantization of the Hall conductivity at low temperatures, when the
+absolute value of the gap opened by the electric field is larger than the
+considered chemical potential.",1612.01148v1
+2023-03-09,Ultrafast Phonon-Diffuse Scattering as a Tool for Observing Chiral Phonons in Monolayer Hexagonal Lattices,"At the 2D limit, hexagonal systems such as monolayer transition metal
+dichalcogenides (TMDs) and graphene exhibit unique coupled spin and
+momentum-valley physics (valley pseudospin) owing to broken spatial inversion
+symmetry and strong spin-orbit coupling. Circularly polarized light provides
+the means for pseudospin-selective excitation of excitons (or electrons and
+holes) and can yield momentum-valley polarized populations of carriers that are
+the subject of proposed valleytronic applications. The chirality of these
+excited carriers have important consequences for the available
+relaxation/scattering pathways, which must conserve (pseudo)angular momentum as
+well as energy. One available relaxation channel that satisfies these
+constraints is coupling to chiral phonons. Here we show that chiral
+carrier-phonon coupling following valley-polarized photoexcitation is expected
+to leads to a strongly valley-polarized chiral phonon distribution that is
+directly measurable using ultrafast phonon-diffuse scattering techniques. Using
+ab-initio calculations we show how the dynamic phonon occupations and valley
+anisotropy determined by nonequilibrium observations can provide a new window
+on the physical processes that drive carrier valley-depolarization in monolayer
+TMDs.",2303.05562v1
+2012-09-07,Quadrupole Susceptibility of Gd-Based Filled Skutterudite Compounds,"It is shown that quadrupole susceptibility can be detected in Gd compounds
+contrary to our textbook knowledge that Gd$^{3+}$ ion induces pure spin moment
+due to the Hund's rules in an $LS$ coupling scheme. The ground-state multiplet
+of Gd$^{3+}$ is always characterized by $J$=7/2, where $J$ denotes total
+angular momentum, but in a $j$-$j$ coupling scheme, one $f$ electron in $j$=7/2
+octet carries quadrupole moment, while other six electrons fully occupy $j$=5/2
+sextet, where $j$ denotes one-electron total angular momentum. For realistic
+values of Coulomb interaction and spin-orbit coupling, the ground-state
+wavefunction is found to contain significant amount of the $j$-$j$ coupling
+component. From the evaluation of quadrupole susceptibility in a simple
+mean-field approximation, we point out a possibility to detect the softening of
+elastic constant in Gd-based filled skutterudites.",1209.1469v1
+2015-06-12,Spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins,"The quantum emulation of spin-momentum coupling (SMC), a crucial ingredient
+for the emergence of topological phases, is currently drawing considerable
+interest. In previous quantum gas experiments, typically two atomic hyperfine
+states were chosen as pseudospins. Here, we report the observation of a new
+kind of SMC achieved by loading a Bose-Einstein condensate (BEC) into
+periodically driven optical lattices. The s- and p-bands of a static lattice,
+which act as pseudospins, are coupled through an additional moving lattice
+which induces a momentum dependent coupling between the two pseudospins,
+resulting in s-p hybrid Floquet-Bloch bands. We investigate the band structures
+by measuring the quasimomentum of the BEC for different velocities and
+strengths of the moving lattice and compare our measurements to theoretical
+predictions. The realization of SMC with lattice bands as pseudospins paves the
+way for engineering novel quantum matter using hybrid orbital bands.",1506.03887v1
+2015-11-05,Rashba realization: Raman with RF,"We theoretically explore a Rashba spin-orbit coupling scheme which operates
+entirely in the absolute ground state manifold of an alkali atom, thereby
+minimizing all inelastic processes. An energy gap between ground eigenstates of
+the proposed coupling can be continuously opened or closed by modifying laser
+polarizations. Our technique uses far-detuned ""Raman"" laser coupling to create
+the Rashba potential, which has the benefit of low spontaneous emission rates.
+At these detunings, the Raman matrix elements that link $m_F$ magnetic sublevel
+quantum numbers separated by two are also suppressed. These matrix elements are
+necessary to produce the Rashba Hamiltonian within a single total angular
+momentum $f$ manifold. However, the far-detuned Raman couplings can link the
+three XYZ states familiar to quantum chemistry, which possess the necessary
+connectivity to realize the Rashba potential. We show that these XYZ states are
+essentially the hyperfine spin eigenstates of $^{87}\text{Rb}$ dressed by a
+strong radio-frequency magnetic field.",1511.01588v2
+2022-01-27,Resonant thermal Hall effect of phonons coupled to dynamical defects,"We present computations of the thermal Hall coefficient of phonons scattering
+off a defect with multiple energy levels. Using a microscopic formulation based
+on the Kubo formula, we find that the leading contribution perturbative in the
+phonon-defect coupling is proportional to the phonon lifetime, and has a
+`side-jump' interpretation. Consequently, the thermal Hall angle is independent
+of the phonon lifetime. The contribution to the thermal Hall coefficient is at
+resonance when the phonon energy equals a defect level spacing. Our results are
+obtained for three different defect models, which apply to different correlated
+electron materials. For the pseudogap regime of the cuprates, we propose a
+model of phonons coupled to an impurity quantum spin in the presence of
+quasi-static magnetic order with an isotropic Zeeman coupling to the applied
+field, and without spin-orbit interaction.",2201.11681v6
+2023-01-03,Anomalous circular phonon dichroism in transition metal dichalcogenides,"A magnetic field can generally induce circular phonon dichroism based on the
+formation of Landau levels of electrons. Here, we study the
+magnetization-induced circular phonon dichroism in transition metal
+dichalcogenides, without forming Landau levels. We find that, instead of the
+conventional deformation potential coupling, pseudogauge-type electron-phonon
+coupling plays an essential role in the emergence of the phenomenon. As a
+concrete example, a large dichroism signal is obtained in monolayer MoTe2 on a
+EuO substrate, even without considering Rashba spin-orbit coupling. Due to the
+two-dimensional spin-valley-coupled band structure, MoTe2 shows a reciprocal
+and nonreciprocal absorption of circularly polarized acoustic phonons upon
+reversing the direction of phonon propagation and magnetization, respectively.
+By varying the gate voltage, a tunable circular phonon dichroism can be
+realized, which paves a way toward different physics and applications of
+two-dimensional acoustoelectronics.",2301.00917v1
+2005-12-14,Electronic spin precession and interferometry from spin-orbital entanglement in a double quantum dot,"A double quantum dot inserted in parallel between two metallic leads allows
+to entangle the electron spin with the orbital (dot index) degree of freedom.
+An Aharonov-Bohm orbital phase can then be transferred to the spinor
+wavefunction, providing a geometrical control of the spin precession around a
+fixed magnetic field. A fully coherent behaviour is obtained in a mixed
+orbital/spin Kondo regime. Evidence for the spin precession can be obtained,
+either using spin-polarized metallic leads or by placing the double dot in one
+branch of a metallic loop.",0512324v3
+2012-03-20,"Rovibrational dynamics of the strontium molecule in the A^1Σ_u^+, c^3Π_u, and a^3Σ_u^+ manifold from state-of-the-art ab initio calculations","State-of-the-art ab initio techniques have been applied to compute the
+potential energy curves for the electronic states in the A^1\Sigma_u^+,
+c^3\Pi_u, and a^3\Sigma_u^+ manifold of the strontium dimer, the spin-orbit and
+nonadiabatic coupling matrix elements between the states in the manifold, and
+the electric transition dipole moment from the ground X^1\Sigma_g^+ to the
+nonrelativistic and relativistic states in the A+c+a manifold. The potential
+energy curves and transition moments were obtained with the linear response
+(equation of motion) coupled cluster method limited to single, double, and
+linear triple excitations for the potentials and limited to single and double
+excitations for the transition moments. The spin-orbit and nonadiabatic
+coupling matrix elements were computed with the multireference configuration
+interaction method limited to single and double excitations. Our results for
+the nonrelativistic and relativistic (spin-orbit coupled) potentials deviate
+substantially from recent ab initio calculations. The potential energy curve
+for the spectroscopically active (1)0_u^+ state is in quantitative agreement
+with the empirical potential fitted to high-resolution Fourier transform
+spectra [A. Stein, H. Knoeckel, and E. Tiemann, Eur. Phys. J. D 64, 227
+(2011)]. The computed ab initio points were fitted to physically sound
+analytical expressions, and used in converged coupled channel calculations of
+the rovibrational energy levels in the A+c+a manifold and line strengths for
+the A^1\Sigma_u^+ <-- X^1\Sigma_g^+ transitions. Positions and lifetimes of
+quasi-bound Feshbach resonances lying above the ^1S + ^3P_1 dissociation limit
+were also obtained. Our results reproduce (semi)quantitatively the experimental
+data observed thus far. Predictions for on-going and future experiments are
+also reported.",1203.4524v2
+2015-07-13,Ambipolar spin-spin coupling in p$^+$-GaAs,"A novel spin-spin coupling mechanism that occurs during the transport of
+spin-polarized minority electrons in semiconductors is described. Unlike the
+Coulomb spin drag, this coupling arises from the ambipolar electric field which
+is created by the differential movement of the photoelectrons and the
+photoholes. Like the Coulomb spin drag, it is a pure spin coupling that does
+not affect charge diffusion. Experimentally, the coupling is studied in $p^+$
+GaAs using polarized microluminescence. The coupling manifests itself as an
+excitation power dependent reduction in the spin polarization at the excitation
+spot \textit{without} any change of the spatially averaged spin polarization.",1507.03347v1
+2012-12-26,Anomalous spin precession and spin Hall effect in semiconductor quantum wells,"Spin-orbit (SO) interactions give a spin-dependent correction r_so to the
+position operator, referred to as the anomalous position operator. We study the
+contributions of r_so to the spin-Hall effect (SHE) in quasi two-dimensional
+(2D) semiconductor quantum wells with strong band structure SO interactions
+that cause spin precession. The skew scattering and side-jump scattering terms
+in the SHE vanish, but we identify two additional terms in the SHE, due to
+r_so, which have not been considered in the literature so far. One term
+reflects the modification of the spin precession due to the action of the
+external electric field (the field drives the current in the quantum well),
+which produces, via r_so, an effective magnetic field perpendicular to the
+plane of the quantum well. The other term reflects a similar modification of
+the spin precession due to the action of the electric field created by random
+impurities, and appears in a careful formulation of the Born approximation. We
+refer to these two effects collectively as anomalous spin precession and we
+note that they contribute to the SHE to the first order in the SO coupling
+constant even though they formally appear to be of second order. In electron
+systems with weak momentum scattering, the contribution of the anomalous spin
+precession due to the external electric field equals 1/2 the usual side-jump
+SHE, while the additional impurity-dependent contribution depends on the form
+of the band structure SO coupling. For band structure SO linear in wave vector
+the two additional contributions cancel. For band structure SO cubic in wave
+vector only the contribution due to external electric field is present, and can
+be detected through its density dependence. In 2D hole systems both anomalous
+spin precession contributions vanish identically.",1212.6262v2
+2013-02-13,Relativistic mergers of compact binaries in clusters: The fingerprint of the spin,"Dense stellar systems such as globular clusters and dense nuclear clusters
+are the breeding ground of sources of gravitational waves for the advanced
+detectors LIGO and Virgo. These systems deserve a close study to estimate rates
+and parameter distribution. This is not an easy task, since the evolution of a
+dense stellar cluster involves the integration of $N$ bodies with high
+resolution in time and space and including hard binaries and their encounters
+and, in the case of gravitational waves (GWs), one needs to take into account
+important relativistic corrections. In this work we present the first
+implementation of the effect of spin in mergers in a direct-summation code,
+NBODY6. We employ non-spinning post-Newtonian corrections to the Newtonian
+accelerations up to 3.5 post-Newtonian (PN) order as well as the spin-orbit
+coupling up to next-to-lowest order and the lowest order spin-spin coupling. We
+integrate spin precession and add a consistent treatment of mergers. We analyse
+the implementation by running a set of two-body experiments and then we run a
+set of 500 simulations of a relativistic stellar cluster. In spite of the large
+number of mergers in our tests, the application of the algorithm is robust. We
+find in particular the formation of a runaway star whose spin decays with the
+mass it wins, independently of the initial value of the spins of the stars.
+More remarkably, the subset of compact objects that do not undergo many
+mergers, and hence represent a more realistic system, has a correlation between
+the final absolute spin and the initial choice for the initial distribution,
+which could provide us with information about the evolution of spins in dense
+clusters once the first detections have started.",1302.3135v2
+2017-02-16,Stretchable persistent spin helices in GaAs quantum wells,"The Rashba and Dresselhaus spin-orbit (SO) interactions in 2D electron gases
+act as effective magnetic fields with momentum-dependent directions, which
+cause spin decay as the spins undergo arbitrary precessions about these
+randomly-oriented SO fields due to momentum scattering. Theoretically and
+experimentally, it has been established that by fine-tuning the Rashba $\alpha$
+and Dresselhaus $\beta$ couplings to equal $\it{fixed}$ strengths
+$\alpha=\beta$, the total SO field becomes unidirectional thus rendering the
+electron spins immune to dephasing due to momentum scattering. A robust
+persistent spin helix (PSH) has already been experimentally realized at this
+singular point $\alpha=\beta$. Here we employ the suppression of weak
+antilocalization as a sensitive detector for matched SO fields together with a
+technique that allows for independent electrical control over the SO couplings
+via top gate voltage $V_T$ and back gate voltage $V_B$. We demonstrate for the
+first time the gate control of $\beta$ and the $\it{continuous\,locking}$ of
+the SO fields at $\alpha=\beta$, i.e., we are able to vary both $\alpha$ and
+$\beta$ controllably and continuously with $V_T$ and $V_B$, while keeping them
+locked at equal strengths. This makes possible a new concept: ""stretchable
+PSHs"", i.e., helical spin patterns with continuously variable pitches $P$ over
+a wide parameter range. The extracted spin-diffusion lengths and decay times as
+a function of $\alpha/\beta$ show a significant enhancement near
+$\alpha/\beta=1$. Since within the continuous-locking regime quantum transport
+is diffusive (2D) for charge while ballistic (1D) for spin and thus amenable to
+coherent spin control, stretchable PSHs could provide the platform for the much
+heralded long-distance communication $\sim 8 - 25$ $\mu$m between solid-state
+spin qubits.",1702.05190v2
+2018-10-24,Long spin coherence length and bulk-like spin-orbit torque in ferrimagnetic multilayers,"Ferromagnetic spintronics has been a main focus as it offers non-volatile
+memory and logic applications through current-induced spin-transfer torques.
+Enabling wider applications of such magnetic devices requires a lower switching
+current for a smaller cell while keeping the thermal stability of magnetic
+cells for non-volatility. As the cell size reduces, however, it becomes
+extremely difficult to meet this requirement with ferromagnets because
+spin-transfer torque for ferromagnets is a surface torque due to rapid spin
+dephasing, leading to the 1/ferromagnet-thickness dependence of the spin-torque
+efficiency. Requirement of a larger switching current for a thicker and thus
+more thermally stable ferromagnetic cell is the fundamental obstacle for
+high-density non-volatile applications with ferromagnets. Theories predicted
+that antiferromagnets have a long spin coherence length due to the staggered
+spin order on an atomic scale, thereby resolving the above fundamental
+limitation. Despite several spin-torque experiments on antiferromagnets and
+ferrimagnetic alloys, this prediction has remained unexplored. Here we report a
+long spin coherence length and associated bulk-like-torque characteristic in an
+antiferromagnetically coupled ferrimagnetic multilayer. We find that a
+transverse spin current can pass through > 10 nm-thick ferrimagnetic Co/Tb
+multilayers whereas it is entirely absorbed by 1 nm-thick ferromagnetic Co/Ni
+multilayer. We also find that the switching efficiency of Co/Tb multilayers
+partially reflects a bulk-like-torque characteristic as it increases with the
+ferrimagnet-thickness up to 8 nm and then decreases, in clear contrast to
+1/thickness-dependence of Co/Ni multilayers. Our results on
+antiferromagnetically coupled systems will invigorate researches towards
+energy-efficient spintronic technologies.",1810.10404v1
+2011-09-04,Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots,"Decoherence caused by nuclear field fluctuations is a fundamental obstacle to
+the realization of quantum information processing using single electron spins.
+Alternative proposals have been made to use spin qubits based on valence band
+holes having weaker hyperfine coupling. However, it was demonstrated recently
+both theoretically and experimentally that the hole hyperfine interaction is
+not negligible, although a consistent picture of the mechanism controlling the
+magnitude of the hole-nuclear coupling is still lacking. Here we address this
+problem by performing isotope selective measurement of the valence band
+hyperfine coupling in InGaAs/GaAs, InP/GaInP and GaAs/AlGaAs quantum dots.
+Contrary to existing models we find that the hole hyperfine constant along the
+growth direction of the structure (normalized by the electron hyperfine
+constant) has opposite signs for different isotopes and ranges from -15% to
++15%. We attribute such changes in hole hyperfine constants to the competing
+positive contributions of p-symmetry atomic orbitals and the negative
+contributions of d-orbitals. Furthermore, we find that the d-symmetry
+contribution leads to a new mechanism for hole-nuclear spin flips which may
+play an important role in hole spin decoherence. In addition the measured
+hyperfine constants enable a fundamentally new approach for verification of the
+computed Bloch wavefunctions in the vicinity of nuclei in semiconductor
+nanostructures.",1109.0733v3
+2018-09-09,Rare-earth chalcogenides: A large family of triangular lattice spin liquid candidate,"Frustrated quantum magnets are expected to host many exotic quantum spin
+states like quantum spin liquid (QSL), and have attracted numerous interest in
+modern condensed matter physics. The discovery of the triangular lattice spin
+liquid candidate YbMgGaO$_4$ stimulated an increasing attention on the
+rare-earth-based frustrated magnets with strong spin-orbit coupling. Here we
+report the synthesis and characterization of a large family of rare-earth
+chalcogenides AReCh$_2$ (A = alkali or monovalent ions, Re = rare earth, Ch =
+O, S, Se). The family compounds share the same structure (R$\bar{3}$m) as
+YbMgGaO$_4$, and antiferromagnetically coupled rare-earth ions form perfect
+triangular layers that are well separated along the $c$-axis. Specific heat and
+magnetic susceptibility measurements on NaYbO$_2$, NaYbS$_2$ and NaYbSe$_2$
+single crystals and polycrystals, reveal no structural or magnetic transition
+down to 50mK. The family, having the simplest structure and chemical formula
+among the known QSL candidates, removes the issue on possible exchange
+disorders in YbMgGaO$_4$. More excitingly, the rich diversity of the family
+members allows tunable charge gaps, variable exchange coupling, and many other
+advantages. This makes the family an ideal platform for fundamental research of
+QSLs and its promising applications.",1809.03025v2
+2018-06-15,Field-free Magnetization Switching by Utilizing the Spin Hall Effect and Interlayer Exchange Coupling of Iridium,"Magnetization switching by spin-orbit torque (SOT) via spin Hall effect
+represents as a competitive alternative to that by spin-transfer torque (STT)
+used for magnetoresistive random access memory (MRAM), as it does not require
+high-density current to go through the tunnel junction. For perpendicular MRAM,
+however, SOT driven switching of the free layer requires an external in-plane
+field, which poses limitation for viability in practical applications. Here we
+demonstrate field-free magnetization switching of a perpendicular magnet by
+utilizing an Iridium (Ir) layer. The Ir layer not only provides SOTs via spin
+Hall effect, but also induce interlayer exchange coupling with an in-plane
+magnetic layer that eliminates the need for the external field. Such dual
+functions of the Ir layer allows future build-up of magnetoresistive stacks for
+memory and logic applications. Experimental observations show that the SOT
+driven field-free magnetization reversal is characterized as domain nucleation
+and expansion. Micromagnetic modeling is carried out to provide in-depth
+understanding of the perpendicular magnetization reversal process in the
+presence of an in-plane exchange coupling field.",1806.05961v4
+2021-04-06,Renormalization of spin excitations and Kondo effect in open shell nanographenes,"We study spin excitations and Kondo effect in open-shell nanographenes,
+motivated by recent scanning tunneling inelastic spectroscopy experiments.
+Specifically, we consider three systems, the triangulene, the extended
+triangulene with rocket shape, both with an $S=1$ ground state, and a
+triangulene dimer with $S=0$ on account of intermolecular exchange. We focus on
+the consequences of hybridization of the nanographene zero-modes with a
+conducting substrate on the $dI/dV$ lineshapes associated with spin
+excitations. The partially filled nanographene zero-modes coupled to the
+conduction electrons in the substrate constitute multi-orbital Anderson
+impurity models that we solve in the one-crossing approximation which treats
+the coupling to the substrate to infinite order. We find that the coupling to
+the substrate leads to (i) renormalization of the spin flip excitation energies
+of the bare molecule, (ii) broadening of the spectral features and (iii) the
+emergence of zero bias Kondo peaks for the $S=1$ ground states. The calculated
+substrate induced shift of the spin excitation energies is found to be
+significantly larger than their broadening, which implies that this effect has
+to be considered when comparing experimental results and theory.",2104.02503v2
+2022-03-04,Exchange interactions and spin dynamics in the layered honeycomb ferromagnet CrI$_3$,"We derive the microscopic spin Hamiltonian for rhombohedral CrI$_3$ using
+extensive first-principles density functional theory (DFT) calculations which
+incorporate spin-orbit coupling and Hubbard U. Our calculations indicate a
+dominant nearest-neighbor ferromagnetic Heisenberg exchange with weaker
+further-neighbor Heisenberg terms. In addition, we find a Dzyaloshinskii-Moriya
+interaction which primarily drives a topological gap in the spin-wave spectrum
+at the Dirac point, and uncover a non-negligible antiferromagnetic Kitaev
+coupling between the S=3/2 Cr moments. The out-of-plane magnetic moment is
+stabilized by weak symmetric bond-dependent terms and a local single-ion
+anisotropy. Using linear spin wave theory, we find that our exchange parameters
+are in reasonably good agreement with inelastic neutron scattering (INS)
+experiments. Employing classical Monte Carlo simulations, we study the magnetic
+phase transition temperature $T_c$ and its evolution with an applied in-plane
+magnetic field. We further demonstrate how future high-resolution INS
+experiments on the magnon dispersion of single crystals in an in-plane magnetic
+field may be used to quantitatively extract the strength of the
+antiferromagnetic Kitaev exchange coupling.",2203.02567v1
+2022-12-14,Identifying Pauli blockade regimes in bilayer graphene double quantum dots,"Recent experimental observations of current blockades in 2-D material
+quantum-dot platforms have opened new avenues for spin and valley-qubit
+processing. Motivated by experimental results, we construct a model capturing
+the delicate interplay of Coulomb interactions, inter-dot tunneling, Zeeman
+splittings, and intrinsic spin-orbit coupling in a double quantum dot structure
+to simulate the Pauli blockades. Analyzing the relevant Fock-subspaces of the
+generalized Hamiltonian, coupled with the density matrix master equation
+technique for transport across the setup, we identify the generic class of
+blockade mechanisms. Most importantly, and contrary to what is widely
+recognized, we show that conducting and blocking states responsible for the
+Pauli-blockades are a result of the coupled effect of all degrees of freedom
+and cannot be explained using the spin or the valley pseudo-spin only. We then
+numerically predict the regimes where Pauli blockades might occur, and, to this
+end, we verify our model against actual experimental data and propose that our
+model can be used to generate data sets for different values of parameters with
+the ultimate goal of training on a machine learning algorithm. Our work
+provides an enabling platform for a predictable theory-aided experimental
+realization of single-shot readout of the spin and valley states on DQDs based
+on 2D-material platforms.",2212.07208v1
+2023-10-18,Large Rashba splittings in bulk and monolayer of BiAs,"Two-dimensional materials with Rashba split bands near the Fermi level are
+key to developing upcoming next-generation spintronics. They enable generating,
+detecting, and manipulating spin currents without an external magnetic field.
+Here, we propose BiAs as a novel layered semiconductor with large Rashba
+splitting in bulk and monolayer forms. Using first-principles calculations, we
+determined the lowest energy structure of BiAs and its basic electronic
+properties. Bulk BiAs has a layered crystal structure with two atoms in a
+rhombohedral primitive cell, similar to the parent Bi and As elemental phases.
+It is a semiconductor with a narrow and indirect band gap. The spin-orbit
+coupling leads to Rashba-Dresselhaus spin splitting and characteristic spin
+texture around the L-point in the Brillouin zone of the hexagonal conventional
+unit cell, with Rashba energy and Rashba coupling constant for valence
+(conduction) band of $E_R$= 137 meV (93 meV) and $\alpha_R$= 6.05 eV\AA~(4.6
+eV{\AA}). In monolayer form (i.e., composed of a BiAs bilayer), BiAs has a much
+larger and direct band gap at $\Gamma$, with a circular spin texture
+characteristic of a pure Rashba effect. The Rashba energy $E_R$= 18 meV and
+Rashba coupling constant $\alpha_R$= 1.67 eV{\AA} of monolayer BiAs are quite
+large compared to other known 2D materials, and these values are shown to
+increase under tensile biaxial strain.",2310.12094v1
+2002-03-22,Roles of Electron Correlations in the Spin-Triplet Superconductivity of Sr2RuO4,"We discuss a microscopic mechanism of the spin-tiplet superconductivity in
+the quasi-two-dimensional ruthenium oxide Sr2RuO4 on the basis of
+two-dimensional three-band Hubbard model. We solve the linearized Eliashberg
+equation by taking into account the full momentum-frequency dependence of the
+order parameter for the spin-triplet and the spin-singlet states, and estimate
+the transition temperature as a function of the Coulomb integrals. The
+effective pairing interaction is expanded perturbatively with respect to the
+Coulomb interaction at the Ru sites up to the third order. As a result, we show
+that the spin-triplet p-wave state is more stable than the spin-singlet d-wave
+state for moderately strong Coulomb interaction. Our results suggest that one
+of the three bands, $\gamma$, plays a dominant role in the superconducting
+transition, and the pairing on the other two bands($\alpha$ and $\beta$) is
+induced passively through the inter-orbit couplings. The most significant
+momentum dependence for the p-wave pairing originates from the vertex
+correction terms, while the incommensurate antiferromagnetic spin fluctuations,
+which are observed in inelastic neutron scattering experiments, are expected to
+disturb the p-wave pairing by enhancing the d-wave pairing. Therefore we can
+regard the spin-triplet superconductivity in Sr2RuO4 as one of the natural
+results of the electron correlations, and cannot consider as a result of some
+strong magnetic fluctuations. We will also mention the normal Fermi liquid
+properties of Sr2RuO4.",0203453v2
+2005-02-03,Charge-induced maximal spin states of a polynuclear transition-metal complex,"We theoretically investigate the ground state spin of a polynuclear
+transition-metal complex as a function of the number of added electrons taking
+into account strong electron correlations. Our phenomenological model of the
+so-called [$2\times2$]-grid molecule incorporates the relevant electronic
+degrees of freedom on the four transition-metal centers (either Fe$^{2+}$ or
+Co$^{2+}$) and the four organic bridging ligands. Extra electrons preferably
+occupy redox orbitals on the ligands. Magnetic interactions between these
+ligands are mediated by transition-metal ions {\em and vice versa}. Using both
+perturbation theory and exact diagonalization we find that for certain charge
+states the maximally attainable total spin (either $S_{\mathsf{tot}}=3/2$ or
+$S_{\mathsf{tot}}=7/2$) may actually be achieved. Due to the Nagaoka mechanism,
+all unpaired electron spins couple to a total maximal spin, including unpaired
+electron spins on the metal-ions in the case of Co$^{2+}$. The parameters are
+chosen to be consistent with cyclovoltammetry experiments in which up to twelve
+redox states have been observed. The above effect may also be realized in other
+complexes with an appropriate connectivity between the redox sites. The maximal
+spin states of such a charge-switchable molecular magnet may be experimentally
+observed as spin-blockade effects on the electron tunneling in a three-terminal
+transport setup.",0502093v1
+2008-02-04,Thermospin Hall effect generated by thermal influence and thermoelectric effect,"In this paper, we present the theoretical predication of a thermospin Hall
+effect, in which a transverse spin current can be generated in semiconductors
+in the presence of spin-orbit coupling by a frequency-dependent longitudinal
+temperature gradient. Because of the thermoelectric effect, there is no net
+charge current but there is a heat flow from the hot side to the cold side. We
+perform the theoretical calculation of dynamical thermospin Hall conductivity
+in a two-dimensional Rashba spintronic system. It has been shown that the
+direct interband optical transition dominates the ordering and manipulation of
+spin in the generation of a transverse intrinsic spin current. In view of the
+role of the thermoelectric effect, the contributions to the thermospin Hall
+effect are classified as that originating from a direct contribution of thermal
+electronic diffusion and that from the compensatory electron flow in balance
+with the thermal diffusion. For a finite system, the analysis yields evidence
+that the spin accumulation around the edges of a plate determines the
+magnetization. In equilibrium, a field created by a magnetization gradient
+emerges in the direction perpendicular to the temperature gradient. The
+experimental observation of the thermospin Hall effect is proposed by measuring
+the longitudinal temperature difference with the injection of a transverse spin
+current and by analyzing the Hall angle. In addition, in order to achieve pure
+spin accumulation in the spin Hall effect, an extension of the thermospin Hall
+effect for exciting electron-hole pairs in semiconductors is proposed.",0802.0348v1
+2011-11-30,Probing Relativistic Astrophysics Around SMBHs: The Suzaku AGN Spin Survey,"In addition to providing vital clues as to the formation and evolution of
+black holes, the spin of black holes may be an important energy source in the
+Universe. Over the past couple of years, tremendous progress has been made in
+the realm of observational measurements of spin. In particular, detailed
+characterization and modeling of X-ray spectral features emitted from the inner
+regions of black hole accretion disks have allowed us to probe the location of
+the innermost stable circular orbit and hence the spin. In this contribution, I
+will describe the Suzaku AGN Spin Survey, an on-going Cycle 4--6 Suzaku Key
+Project that aims to probe five nearby AGN with sufficient depth that strong
+gravity effects and spin can be robustly assessed. Of the three objects for
+which we currently have our deep datasets, we can constrain spin in two
+(NGC3783, a>0.9; Fairall 9, $a=0.45\pm 0.15$) whereas complexities with the
+warm absorber prevent us from reporting results for NGC3516. We conclude with a
+brief discussion of spin-dependent selection biases in flux-limited surveys.",1112.0036v1
+2014-08-25,Equivalence of ADM Hamiltonian and Effective Field Theory approaches at next-to-next-to-leading order spin1-spin2 coupling of binary inspirals,"The next-to-next-to-leading order spin1-spin2 potential for an inspiralling
+binary, that is essential for accuracy to fourth post-Newtonian order, if both
+components in the binary are spinning rapidly, has been recently derived
+independently via the ADM Hamiltonian and the Effective Field Theory
+approaches, using different gauges and variables. Here we show the complete
+physical equivalence of the two results, thereby we first prove the equivalence
+of the ADM Hamiltonian and the Effective Field Theory approaches at
+next-to-next-to-leading order with the inclusion of spins. The main difficulty
+in the spinning sectors, which also prescribes the manner in which the
+comparison of the two results is tackled here, is the existence of redundant
+unphysical spin degrees of freedom, associated with the spin gauge choice of a
+point within the extended spinning object for its representative worldline.
+After gauge fixing and eliminating the unphysical degrees of freedom of the
+spin and its conjugate at the level of the action, we arrive at curved
+spacetime generalizations of the Newton-Wigner variables in closed form, which
+can also be used to obtain further Hamiltonians, based on an Effective Field
+Theory formulation and computation. Finally, we make use of our validated
+result to provide gauge invariant relations among the binding energy, angular
+momentum, and orbital frequency of an inspiralling binary with generic compact
+spinning components to fourth post-Newtonian order, including all known sectors
+up to date.",1408.5762v2
+2017-08-24,Hierarchy of exchange interactions in the triangular-lattice spin-liquid YbMgGaO$_{4}$,"The spin-1/2 triangular lattice antiferromagnet YbMgGaO$_{4}$ has attracted
+recent attention as a quantum spin-liquid candidate with the possible presence
+of off-diagonal anisotropic exchange interactions induced by spin-orbit
+coupling. Whether a quantum spin-liquid is stabilized or not depends on the
+interplay of various exchange interactions with chemical disorder that is
+inherent to the layered structure of the compound. We combine time-domain
+terahertz spectroscopy and inelastic neutron scattering measurements in the
+field polarized state of YbMgGaO$_{4}$ to obtain better microscopic insights on
+its exchange interactions. Terahertz spectroscopy in this fashion functions as
+high-field electron spin resonance and probes the spin-wave excitations at the
+Brillouin zone center, ideally complementing neutron scattering. A global
+spin-wave fit to all our spectroscopic data at fields over 4T, informed by the
+analysis of the terahertz spectroscopy linewidths, yields stringent constraints
+on $g$-factors and exchange interactions. Our results paint YbMgGaO$_{4}$ as an
+easy-plane XXZ antiferromagnet with the combined and necessary presence of
+sub-leading next-nearest neighbor and weak anisotropic off-diagonal
+nearest-neighbor interactions. Moreover, the obtained $g$-factors are
+substantially different from previous reports. This works establishes the
+hierarchy of exchange interactions in YbMgGaO$_{4}$ from high-field data alone
+and thus strongly constrains possible mechanisms responsible for the observed
+spin-liquid phenomenology.",1708.07503v3
+2018-02-18,Magnetoanisotropic spin-triplet Andreev reflection in ferromagnet-Ising superconductor junctions,"We theoretically study the electronic transport through a ferromagnet-Ising
+superconductor junction. A tight-binding Hamiltonian describing the Ising
+superconductor is presented. Then by combing the non-equilibrium Green's
+function method, the expressions of Andreev reflection coefficient and
+conductance are obtained. A strong magnetoanisotropic spin-triplet Andreev
+reflection is shown, and the magnetoanisotropic period is $\pi$ instead of
+$2\pi$ as in the conventional magnetoanisotropic system. We demonstrate a
+significant increase of the spin-triplet Andreev reflection for the single-band
+Ising superconductor. Furthermore, the dependence of the Andreev reflection on
+the incident energy and incident angle are also investigated. A complete
+Andreev reflection can occur when the incident energy is equal to the
+superconductor gap, regardless of the Fermi energy (spin polarization) of the
+ferromagnet. For the suitable oblique incidence, the spin-triplet Andreev
+reflection can be strongly enhanced. In addition, the conductance
+spectroscopies of both zero bias and finite bias are studied, and the influence
+of gate voltage, exchange energy, and spin-orbit coupling on the conductance
+spectroscopy are discussed in detail. The conductance reveals a strong
+magnetoanisotropy with period $\pi$ as the Andreev reflection coefficient. When
+the magnetization direction is parallel to the junction plane, a large
+conductance peak always emerges at the superconductor gap. This work offers a
+comprehensive and systematic study of the spin-triplet Andreev reflection, and
+has underlying application of $\pi$-periodic spin valve in spintronics.",1802.06414v1
+2020-07-25,Fully spin-polarized nodal chain state in half metal LiV$_2$O$_4$,"Nodal-chain fermions, as novel topological states of matter, have been hotly
+discussed in non-magnetic materials. Here, by using first-principles
+calculations and symmetry analysis, we propose the realization of fully
+spin-polarized nodal chain in the half-metal state of LiV$_2$O$_4$ compound.
+The material naturally shows a ferromagnetic ground state, and takes on a
+half-metal band structure with only the bands from the spin-up channel present
+near the Fermi level. The spin-up bands cross with each other, which form two
+types of nodal loops. These nodal loops arise from band inversion and are under
+the protection of the glide mirror symmetries. Remarkably, we find the nodal
+loops conjunct with each other and form chain-like nodal structure.
+Correspondingly, the w-shaped surface states are also fully spin-polarized. The
+fully spin-polarized nodal chain identified here has not been proposed in
+realistic materials before. An effective model is constructed to describe the
+nature of nodal chain. The effects of the electron correlation, the lattice
+strains, and the spin-orbit coupling are discussed. The fully spin-polarized
+bulk nodal-chain and the associated nontrivial surface states for a half-metal
+may open novel applications in spintronics.",2007.12842v1
+2019-07-18,Topological theory of Lieb-Schultz-Mattis theorems in quantum spin systems,"The Lieb-Schultz-Mattis (LSM) theorem states that a spin system with
+translation and spin rotation symmetry and half-integer spin per unit cell does
+not admit a gapped symmetric ground state lacking fractionalized excitations.
+That is, the ground state must be gapless, spontaneously break a symmetry, or
+be a gapped spin liquid. Thus, such systems are natural spin-liquid candidates
+if no ordering is found. In this work, we give a much more general criterion
+that determines when an LSM-type theorem holds in a spin system. For example,
+we consider quantum magnets with arbitrary space group symmetry and/or
+spin-orbit coupling. Our criterion is intimately connected to recent work on
+the general classification of topological phases with spatial symmetries and
+also allows for the computation of an ""anomaly"" associated with the existence
+of an LSM theorem. Moreover, our framework is also general enough to encompass
+recent works on ""SPT-LSM"" theorems where the system admits a gapped symmetric
+ground state without fractionalized excitations, but such a ground state must
+still be non-trivial in the sense of symmetry-protected topological (SPT)
+phases.",1907.08204v3
+2019-10-28,Rashba-like spin splitting along three momentum directions in trigonal layered PtBi2,"Spin-orbit coupling (SOC) has gained much attention for its rich physical
+phenomena and highly promising applications in spintronic devices. The
+Rashba-type SOC in systems with inversion symmetry breaking is particularly
+attractive for spintronics applications since it allows for flexible
+manipulation of spin current by external electric fields. Here, we report the
+discovery of a giant anisotropic Rashba-like spin splitting along three
+momentum directions (3D Rashba-like spin splitting) with a helical spin
+polarization around the M points in the Brillouin zone of trigonal layered
+PtBi2. Due to its inversion asymmetry and reduced symmetry at the M point,
+Rashba-type as well as Dresselhaus-type SOC cooperatively yield a 3D spin
+splitting with alpha~ 4.36 eVA in PtBi2. The experimental realization of 3D
+Rashba-like spin splitting not only has fundamental interests but also paves
+the way to the future exploration of a new class of material with unprecedented
+functionalities for spintronics applications.",1910.12671v1
+2020-01-16,Characterizing spin-one Kitaev quantum spin liquids,"Material realizations of the bond-dependent Kitaev interactions with $S$=1/2
+local moments have vitalized the research in quantum spin liquids. Recently, it
+has been proposed that higher-spin analogues of the Kitaev interactions may
+also occur in a number of materials with strong spin-orbit coupling. In
+contrast to the celebrated $S$=1/2 Kitaev model on the honeycomb lattice, the
+higher-spin Kitaev models are not exactly solvable. Hence, the existence of
+quantum spin liquids in these systems remains an outstanding question. In this
+work, we use the density matrix renormalization group (DMRG) methods to
+numerically investigate the $S$=1 Kitaev model with both ferromagnetic (FM) and
+antiferromagnetic (AFM) interactions. Using results on a cylindrical geometry
+with various circumferences, we conclude that the ground state of the $S$=1
+Kitaev model is a quantum spin liquid with a $\mathbb{Z}_2$ gauge structure. We
+also put a bound on the excitation gap, which turns out to be quite small. The
+magnetic field responses for the FM and AFM models are similar to those of the
+$S$=1/2 counterparts. In particular, in the AFM $S$=1 model, a gapless quantum
+liquid state emerges in an intermediate window of magnetic field strength,
+before the system enters a trivial polarized state.",2001.06000v2
+2019-01-17,Interface-driven unusual anomalous Hall effect in MnxGa/Pt bilayers: No correlation with chiral spin structures,"The effects of spin-orbit coupling and symmetry breaking at the interface
+between a ferromagnet and heavy metal are particularly important for spin-based
+information storage and computation. Recent discoveries suggest they can create
+chiral spin structures (e.g. skyrmions), which have often been identified
+through the appearance of the bump/dip features of Hall signals, the so-called
+topological Hall effect (THE). In this work, however, we have present an
+unusual anomalous Hall effect (UAHE) in MnxGa/Pt bilayers and demonstrated that
+the features extremely similar to THE can be generated without involving any
+chiral spin structures. The low temperature magnetic force microscopy has been
+used to explore the magnetic field-dependent behavior of spin structures, and
+the UAHE as a function of magnetic field does not peak near the maximal density
+of magnetic bubbles. The results unambiguously evidence that the UAHE in
+MnxGa/Pt bilayers shows no correlation with chiral spin structures but is
+driven by the modified interfacial properties. The bump/dip features of Hall
+signals cannot be taken as an unambiguous signature for the emergence of chiral
+spin structures, and a wealth of underlying and interesting physics need
+explored.",1901.05646v3
+2019-02-26,Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules,"We study theoretically spin relaxation during phonon-assisted tunneling of a
+single electron in self-assembled InAs/GaAs quantum-dot molecules formed by
+vertically stacked dots. We find that the spin-flip tunneling rate may be as
+high as 1% of the spin-conserving one. By studying the dependence of spin
+relaxation rate on external fields, we show that the process is active at a
+considerable rate even without the magnetic field, and scales with the latter
+differently than the relaxation in a Zeeman doublet. Utilizing a multiband
+$\boldsymbol{k}\cdot\boldsymbol{p}$ theory, we selectively investigate the
+impact of various spin-mixing terms in the electron energy and carrier-phonon
+interaction Hamiltonians. As a result, we identify the main contribution to
+come from the Dresselhaus spin-orbit interaction, which is responsible for the
+zero-field effect. At magnetic fields above $\sim$ 15 T, this is surpassed by
+other contributions due to the structural shear strain. We also study the
+impact of the sample morphology and determine that the misalignment of the dots
+may enhance relaxation rate by over an order of magnitude. Finally, via virtual
+tunneling at nonzero temperature, the process in question also affects
+stationary electrons in tunnel-coupled structures and provides a Zeeman-doublet
+spin relaxation channel even without the magnetic field.",1902.10112v2
+2019-08-19,Tunable Giant Rashba-type Spin Splitting in PtSe$_2$/MoSe$_2$ Heterostructure,"We report a giant Rashba-type spin splitting in two-dimensional
+heterostructure PtSe$_2$/MoSe$_2$ with first-principles calculations. We obtain
+a large value of spin splitting energy 110 meV at the momentum offset
+$k_0$=0.23 \AA$^{-1}$ around $\mathrm{\Gamma}$ point, arising from the emerging
+strong interfacial spin-orbital coupling induced by the hybridization between
+PtSe$_2$ and MoSe$_2$. Moreover, we find that the band dispersion close to
+valence band maximum around $\Gamma$ point can be well approximated by the
+generalized Rashba Hamiltonian $H(k_{||})=-\frac{\hbar^2 k_{||}^2}{2m}+c
+k_{||}+\alpha_R \vec{\sigma}\cdot(\vec{k}_{||} \times \vec{z})$. It is found
+that the generalized Rashba constant $\eta_R=c+\alpha_R$ in PtSe$_2$/MoSe$_2$
+is as large as 1.3 eV$\cdot\text{\AA}$, and importantly $\eta_R$ can be
+effectively tuned by biaxial strain and external out-of-plane electrical field,
+presenting a potential application for the spin field-effect transistor. In
+addition, with the spin-valley physics at $\mathrm{K}/\mathrm{K}'$ points in
+monolayer MoSe$_2$, we propose a promising model for spin field-effect
+transistor with opto-valleytronic spin injection based on PtSe$_2$/MoSe$_2$
+heterostructure.",1908.06689v3
+2020-10-13,"Large band splitting with tunable spin polarization in two-dimensional ferroelectric GaXY (X= Se, Te; Y= Cl, Br, I) family","It has been generally accepted that the spin-orbit coupling effect in
+noncentrosymmetric materials leads to the band splitting and non-trivial spin
+polarization in the momentum space. However, in some cases, zero net spin
+polarization in the split bands may occurs, dubbed as the band splitting with
+vanishing spin polarization (BSVSP) effect, protected by non-pseudo-polar point
+group symmetry of the wave vector in the first Brillouin zone [Liu et. al.,
+Nat. Commun. \textbf{10}, 5144 (2019)]. In this paper, by using
+first-principles calculations, we show that the BSVSP effect emerges in
+two-dimensional (2D) nonsymmorphic Ga$XY$ ($X$= Se, Te; $Y$= Cl, Br, I) family,
+a new class of 2D materials having in-plane ferroelectricity. Taking the GaTeCl
+monolayer as a representative example, we observe the BSVSP effect in the split
+bands along the $X-M$ line located in the proximity of the conduction band
+minimum. By using $\vec{k}\cdot\vec{p}$ Hamiltonian derived based on the
+symmetry analysis, we clarify that such effect is originated from the
+cancellation of the local spin polarization, enforced by non-pseudo-polar
+$C_{2v}$ point group symmetry of the wave vector along the $X-M$ line.
+Importantly, we find that the spin polarization can be effectively induced by
+applying an external out-of-plane electric field, indicating that an
+electrically tunable spin polarization for spintronic applications is
+plausible.",2010.06191v2
+2018-10-04,Ultrafast Spin-To-Charge Conversion at the Surface of Topological Insulator Thin Films,"Strong spin-orbit coupling, resulting in the formation of
+spin-momentum-locked surface states, endows topological insulators with
+superior spin-to-charge conversion characteristics, though the dynamics that
+govern it have remained elusive. Here, we present an all-optical method that
+enables unprecedented tracking of the ultrafast dynamics of spin-to-charge
+conversion in a prototypical topological insulator Bi$_2$Se$_3$/ferromagnetic
+Co heterostructure, down to the sub-picosecond timescale. Compared to pure
+Bi$_2$Se$_3$ or Co, we observe a giant terahertz emission in the
+heterostructure than originates from spin-to-charge conversion, in which the
+topological surface states play a crucial role. We identify a 0.12-picosecond
+timescale that sets a technological speed limit of spin-to-charge conversion
+processes in topological insulators. In addition, we show that the
+spin-to-charge conversion efficiency is temperature independent in Bi$_2$Se$_3$
+as expected from the nature of the surface states, paving the way for designing
+next-generation high-speed opto-spintronic devices based on topological
+insulators at room temperature.",1810.02253v1
+2021-03-13,Room-temperature ferroelectric switching of spin-to-charge conversion in GeTe,"Since its birth in the 1990s, semiconductor spintronics has suffered from
+poor compatibility with ferromagnets as sources of spin. While the broken
+inversion symmetry of some semiconductors may alternatively allow for
+spin-charge interconversion, its control by electric fields is volatile.
+Ferroelectric Rashba semiconductors stand as appealing materials unifying
+semiconductivity, large spin-orbit coupling, and non-volatility endowed by
+ferroelectricity. However, their potential for spintronics has been little
+explored. Here, we demonstrate the non-volatile, ferroelectric control of
+spin-to-charge conversion at room temperature in epitaxial GeTe films. We show
+that ferroelectric switching by electrical gating is possible in GeTe despite
+its high carrier density. We reveal a spin-to-charge conversion as effective as
+in Pt, but whose sign is controlled by the orientation of the ferroelectric
+polarization. The comparison between theoretical and experimental data suggests
+that spin Hall effect plays a major role for switchable conversion. These
+results open a route towards devices combining spin-based logic and memory
+integrated into a silicon-compatible material.",2103.07646v1
+2021-08-20,Tilted spin current generated by the collinear antiferromagnet RuO2,"We report measurements demonstrating that when the Neel vector of the
+collinear antiferromagnet RuO2 is appropriately canted relative to the sample
+plane, the antiferromagnet generates a substantial out of plane damping-like
+torque. The measurements are in good accord with predictions that when an
+electric field, E is applied to the spin split band structure of RuO2 it can
+cause a strong transverse spin current even in the absence of spin-orbit
+coupling. This produces characteristic changes in all three components of the E
+induced torque vector as a function of the angle of E relative to the crystal
+axes, corresponding to a spin current with a well defined tilted spin
+orientation s approximately (but not exactly) parallel to the Neel vector,
+flowing perpendicular to both E and S. This angular dependence is the signature
+of an antiferromagnetic spin Hall effect with symmetries that are distinct from
+other mechanisms of spin-current generation reported in antiferromagnetic or
+ferromagnetic materials.",2108.09150v1
+2021-12-20,Spin current transport in hybrid Pt / multifunctional magnetoelectric Ga0.6Fe1.4O3 bilayers,"The low power manipulation of magnetization is currently a highly
+sought-after objective in spintronics. Non ferromagnetic large spin-orbit
+coupling heavy metal (NM) / ferromagnet (FM) heterostructures offer interesting
+elements of response to this issue, by granting the manipulation of the FM
+magnetization by the NM spin Hall effect (SHE) generated spin current.
+Additional functionalities, such as the electric field control of the spin
+current generation, can be offered using multifunctional ferromagnets. We have
+studied the spin current transfer processes between Pt and the multifunctional
+magnetoelectric Ga0.6Fe1.4O3 (GFO). In particular, via angular dependent
+magnetotransport measurements, we were able to differentiate between magnetic
+proximity effect (MPE)-induced anisotropic magnetoresistance (AMR) and spin
+Hall magnetoresistance (SMR). Our analysis shows that SMR is the dominant
+phenomenon at all temperatures and is the only one to be considered near room
+temperature, with a magnitude comparable to those observed in Pd/YIG or Pt/YIG
+heterostructures. These results indicate that magnetoelectric GFO thin films
+show promises for achieving an electric-field control of the spin current
+generation in NM/FM oxide-based heterostructures.",2112.10406v1
+2022-08-09,Exploiting anisotropic Rashba effects on real-time photocurrents and spin polarization for transient symmetry breaking,"We theoretically investigate the real-time transient responses of a
+two-dimensional (2D) electron gas with anisotropic Rashba spin-orbit coupling
+(SOC) to laser pulses. Through explicitly monitoring the time-dependent
+photocurrents and spin polarization under different linear polarizations of the
+laser pulse, we find that the transient breaking of the mirror symmetry in
+combination with the anisotropy of the Rashba SOC results in significant
+distinction between the charge-mediated and the spin-mediated contributions to
+the photocurrents. Such distinction is obtained by analyzing the dependence of
+the symmetry-breaking induced (transverse) components of the photocurrents on
+the linear polarization angle of the laser pulse. This suggests a possibility
+of inferring spin-mediated processes in photocurrents without the use of
+circularly polarized lights. Moreover, the interplay between transient symmetry
+breaking and the anisotropy of the Rashba SOC also leads to transiently nonzero
+spin polarization components that are otherwise zero in the steady-state limit
+and the linear response regime. Especially, the out-of-plane spin polarization
+component can be induced or turned off by controlling the relative orientation
+of the linear polarization with respect to the symmetry axis of the 2D
+electronic system, without involving material-intrinsic magnetization effects.
+Our findings demonstrate the efficacy of a particular coordination between the
+polarization of the ultrafast laser pulses and the spatial symmetry of the
+electronic materials in directing the real-time charge and the spin responses
+that are fundamental to the development of ultrafast spintronics in solid
+states.",2208.04805v1
+2022-08-29,Spin Current Density Functional Theory of the Quantum Spin-Hall Phase,"The spin current density functional theory (SCDFT) is the generalization of
+the standard DFT to treat a fermionic system embedded in the effective external
+field produced by the spin-orbit coupling interaction. Even in the absence of a
+spin polarization, the SCDFT requires the electron-electron potential to depend
+on the spin currents $\mathbf{J}^x$, $\mathbf{J}^y$ and $\mathbf{J}^z$, which
+only recently was made possible for practical relativistic quantum-mechanical
+simulations [Phys. Rev. B {\bf 102}, 235118 (2020)]. Here, we apply the SCDFT
+to the quantum spin-Hall phase and show how it improves (even qualitatively)
+the description of its electronic structure relative to the DFT. We study the
+Bi (001) 2D bilayer and its band insulator to topological insulator phase
+transition (via $s+p_z \leftrightarrow p_x +ip_y$ band inversion) as a function
+of mechanical strain. We show that the explicit account of spin currents in the
+electron-electron potential of the SCDFT is key to the appearance of a Dirac
+cone at the $\Gamma$ point in the valence band structure at the onset of the
+topological phase transition. Finally, the valence band structure of this
+system is rationalized using a simple first-order $\mathbf{k} \cdot \mathbf{p}$
+quasi-degenerate perturbation theory model.",2208.13878v1
+2022-10-03,Spin canting and lattice symmetry in La$_2$CuO$_4$,"While the dominant magnetic interaction in La$_2$CuO$_4$ is superexchange
+between nearest-neighbor Cu moments, the pinning of the spin direction depends
+on weak anisotropic effects associated with spin-orbit coupling. The symmetry
+of the octahedral tilt pattern allows an out-of-plane canting of the Cu spins,
+which is compensated by an opposite canting in nearest-neighbor layers. A
+strong magnetic field applied perpendicular to the planes can alter the spin
+canting pattern to induce a weak ferromagnetic phase. In light of recent
+evidence that the lattice symmetry is lower than originally assumed, we take a
+new look at the nature of the field-induced spin-rotation transition. Comparing
+low-temperature neutron diffraction intensities for several magnetic Bragg
+peaks measured in fields of 0 and 14 T, we find that a better fit is provided
+by a model in which spins rotate within both neighboring planes but by
+different amounts, resulting in a noncollinear configuration. This model allows
+a more consistent relationship between lattice symmetry and spin orientation at
+all Cu sites.",2210.01156v3
+2023-03-11,Power efficient ReLU design for neuromorphic computing using spin Hall effect,"We demonstrate a magnetic tunnel junction injected with spin Hall current to
+exhibit linear rotation of magnetization of the free-ferromagnet using only the
+spin current. Using the linear resistance change of the MTJ, we devise a
+circuit for the rectified linear activation (ReLU) function of the artificial
+neuron. We explore the role of different spin Hall effect (SHE) heavy metal
+layers on the power consumption of the ReLU circuit. We benchmark the power
+consumption of the ReLU circuit with different SHE layers by defining a new
+parameter called the spin Hall power factor. It combines the spin Hall angle,
+resistivity, and thickness of the heavy metal layer, which translates to the
+power consumption of the different SHE layers during spin-orbit
+switching/rotation of the free FM. We employ a hybrid spintronics-CMOS
+simulation framework that couples Keldysh non-equilibrium Green's function
+formalism with Landau-Lifshitz-Gilbert-Slonzewski equations and the HSPICE
+circuit simulator to account for diverse physics of spin-transport and the CMOS
+elements in our proposed ReLU design. We also demonstrate the robustness of the
+proposed ReLU circuit against thermal noise and non-trivial power-error
+trade-off that enables the use of an unstable free-ferromagnet for
+energy-efficient design. Using the proposed circuit, we evaluate the
+performance of the convolutional neural network for MNIST datasets and
+demonstrate comparable classification accuracies to the ideal ReLU with an
+energy consumption of 75 $pJ$ per sample.",2303.06463v1
+2023-03-28,Generation of third-harmonic spin oscillation from strong spin precession induced by terahertz magnetic near fields,"The ability to drive a spin system to state far from the equilibrium is
+indispensable for investigating spin structures of antiferromagnets and their
+functional nonlinearities for spintronics. While optical methods have been
+considered for spin excitation, terahertz (THz) pulses appear to be a more
+convenient means of direct spin excitation without requiring coupling between
+spins and orbitals or phonons. However, room-temperature responses are usually
+limited to small deviations from the equilibrium state because of the
+relatively weak THz magnetic fields in common approaches. Here, we studied the
+magnetization dynamics in a HoFeO3 crystal at room temperature. A custom-made
+spiral-shaped microstructure was used to locally generate a strong multicycle
+THz magnetic near field perpendicular to the crystal surface; the maximum
+magnetic field amplitude of about 2 T was achieved. The observed time-resolved
+change in the Faraday ellipticity clearly showed second- and third-order
+harmonics of the magnetization oscillation and an asymmetric oscillation
+behaviour. Not only the ferromagnetic vector M but also the antiferromagnetic
+vector L plays an important role in the nonlinear dynamics of spin systems far
+from equilibrium.",2303.16016v1
+2023-05-01,Hydrogenic Spin-Valley states of the Bromine donor in 2H-MoTe$_2$,"In semiconductors, the identification of doping atomic elements allowing to
+encode a qubit within spin states is of intense interest for quantum
+technologies. In transition metal dichalcogenides semiconductors, the strong
+spin-orbit coupling produces locked spin-valley states with expected long
+coherence time. Here we study the substitutional Bromine Br\textsubscript{Te}
+dopant in 2H-MoTe$_2$. Electron spin resonance measurements show that this
+dopant carries a spin with long-lived nanoseconds coherence time. Using
+scanning tunneling spectroscopy, we find that the hydrogenic wavefunctions
+associated with the dopant levels have characteristics spatial modulations that
+result from their hybridization to the \textbf{Q}-valleys of the conduction
+band. From a Fourier analysis of the conductance maps, we find that the
+amplitude and phase of the Fourier components change with energy according to
+the different irreducible representations of the impurity-site point-group
+symmetry. These results demonstrate that a dopant can inherit the locked
+spin-valley properties of the semiconductor and so exhibit long spin-coherence
+time.",2305.00719v1
+2023-05-25,Optically controlling the competition between spin flips and intersite spin transfer in a Heusler half-metal on sub-100 fs timescales,"The direct manipulation of spins via light may provide a path toward
+ultrafast energy-efficient devices. However, distinguishing the microscopic
+processes that can occur during ultrafast laser excitation in magnetic alloys
+is challenging. Here, we study the Heusler compound Co2MnGa, a material that
+exhibits very strong light-induced spin transfers across the entire M-edge. By
+combining the element-specificity of extreme ultraviolet high harmonic probes
+with time-dependent density functional theory, we disentangle the competition
+between three ultrafast light-induced processes that occur in Co2MnGa:
+same-site Co-Co spin transfer, intersite Co-Mn spin transfer, and ultrafast
+spin-flips mediated by spin-orbit coupling. By measuring the dynamic magnetic
+asymmetry across the entire M-edges of the two magnetic sublattices involved,
+we uncover the relative dominance of these processes at different probe energy
+regions and times during the laser pulse. Our combined approach enables a
+comprehensive microscopic interpretation of laser-induced magnetization
+dynamics on timescales shorter than 100 fs.",2305.16455v2
+2023-06-12,Unraveling the connection between high-order magnetic interactions and local-to-global spin Hamiltonian in non-collinear magnetic dimers,"A spin Hamiltonian, which characterizes interatomic interactions between spin
+moments, is highly valuable in predicting and comprehending the magnetic
+properties of materials. A deeper understanding of the microscopic origin of
+magnetic interactions can open new pathways toward realizing nanometer-scale
+systems for future spintronic devices. Here, we explore a method for explicitly
+calculating interatomic exchange interactions in non-collinear configurations
+of magnetic materials considering only a bilinear spin Hamiltonian in a local
+scenario. Based on density-functional theory (DFT) calculations of dimers
+adsorbed on metallic surfaces, and with a focus on the Dzyaloshinskii-Moriya
+interaction (DMI) which is essential for stabilizing chiral non-collinear
+magnetic states, we discuss the interpretation of the DMI when decomposed into
+microscopic electron and spin densities and currents. We clarify the distinct
+origins of spin currents induced in the system and their connection to the DMI.
+In addition, we reveal how non-collinearity affects the usual DMI, which is
+solely induced by spin-orbit coupling, and DMI-like interactions brought about
+by non-collinearity. We explain how the dependence of the DMI on the magnetic
+configuration establishes a connection between high-order magnetic
+interactions, enabling the transition from a local to a global spin
+Hamiltonian.",2306.07222v2
+2023-07-24,Spintronic Quantum Phase Transition in a $Graphene/Pb_{0.24}Sn_{0.76}Te$ Heterostructure with Giant Rashba Spin-Orbit Coupling,"Mechanical stacking of two dissimilar materials often has surprising
+consequences for heterostructure behavior. In particular, a two-dimensional
+electron gas (2DEG) is formed in the heterostructure of the topological
+crystalline insulator Pb0.24Sn0.76Te and graphene due to contact of a polar
+with a nonpolar surface and the resulting changes in electronic structure
+needed to avoid polar catastrophe. We study the spintronic properties of this
+heterostructure with non-local spin valve devices. We observe spin-momentum
+locking at lower temperatures that transitions to regular spin channel
+transport only at ~40 K. Hanle spin precession measurements show a spin
+relaxation time as high as 2.18 ns. Density functional theory calculations
+confirm that the spin-momentum locking is due to a giant Rashba effect in the
+material and that the phase transition is a Lifshitz transition. The
+theoretically predicted Lifshitz transition is further evident in the phase
+transition-like behavior in the Land\'e g-factor and spin relaxation time.",2307.13113v1
+2023-10-31,Rashba spin splitting based on trilayer graphene systems,"We establish a general Rashba Hamiltonian for trilayer graphene (TLG) by
+introducing an extrinsic layer-dependent Rashba spin-orbit coupling (SOC)
+arising from the off-plane inversion symmetry breaking. Our results indicate
+that the band spin splitting depends strongly on the layer-distribution and
+sign of Rashba SOC as well as the ABA or ABC stacking order of TLG. We find
+that spin splitting is significantly enhanced as the number of layers of the
+Rashba SOC with the same sign and magnitude increases. For the
+spatially-separated two Rashba SOCs of the same magnitude but the opposite
+sign, no spin splitting arises in ABC-TLG due to the preservation of inversion
+symmetry that ensures the complete cancellation of contributions from the
+opposite layers, whereas nonzero spin splitting is observed for ABA-TLG due to
+its own lack of inversion symmetry. We further illustrate that gate voltage is
+effective to modulate the spin-polarized states near the band edges. Moreover,
+we use density functional theory calculations to verify the Rashba splitting
+effect in the example of TLG interfaced by Au layer(s), which induce
+simultaneously the effective terms of Rashba SOC and gate voltage. Our results
+demonstrate the significance of layer and symmetry in manipulating spin and can
+be extended to multilayer graphene or other van der Waals interface systems.",2310.20136v1
+2023-12-12,Quantum Anomalous Hall and Spin Hall Effects in Magnetic Graphene,"A promising approach to attain long-distance coherent spin propagation is
+accessing quantum Hall topological spin-polarized edge states in graphene.
+Achieving this without large external magnetic fields necessitates engineering
+graphene band structure, obtainable through proximity to 2D magnetic materials.
+In this work, we detect spin-polarized helical edge transport in graphene at
+zero external magnetic field, allowed by the out-of-plane magnetic proximity of
+CrPS$_4$ that spin-splits the zeroth Landau level. This zero-field detection of
+the quantum anomalous spin Hall state is enabled by large induced spin-orbit
+and exchange couplings in the graphene that also lead to the detection of an
+enhanced Berry curvature, shifting the Landau levels, and result in an
+unconventional sequence of quantum Hall plateaus. Remarkably, we observe that
+the quantum anomalous Hall transport in the magnetized graphene persists up to
+room temperature. The detection of spin-polarized helical edge states at zero
+magnetic field and the robustness of the quantum anomalous Hall transport up to
+room temperature open the route for practical applications of magnetic graphene
+in quantum information processing and spintronic circuitries.",2312.07515v1
+2023-12-16,Topological phase transitions and thermal Hall effect in a noncollinear spin texture,"The noncollinear spin textures provide promising avenues to stabilize exotic
+magnetic phases and excitations. They have attracted vast attention owning to
+their nontrivial band topology in the past decades. Distinct from the
+conventional route of involving the Dzyaloshinskii-Moriya interaction in a
+honeycomb magnet, the interplay of bond-dependent Kitaev and $\Gamma$
+interactions, originating from the spin-orbit coupling and octahedra crystal
+field in real materials, has demonstrated to be another source to generate
+noncollinear spin textures with multiple spins in a magnetic unit cell.
+Notably, earlier works have revealed a triple-meron crystal (TmX) consisting of
+eighteen spins in the frustrated Kitaev-$\Gamma$ model. Aligning with previous
+efforts, here we attempt to identity that the TmX hosts several peculiar
+features with the help of the linear spin-wave theory. To begin with, the
+symmetric anisotropic exchanges are beneficial for the existence of
+nonreciprocal magnons, which are stabilized by an external magnetic field.
+Further, within the regime of TmX, successive topological phase transitions
+occur, accompanied by the changes of Chern number in value and thermal Hall
+conductivity in sign. In addition, topological nature of magnons is also
+verified by the onset of chiral edge modes in a nanoribbon geometry. Our
+findings pave the way to study topological phenomena of noncollinear spin
+textures in potential Kitaev materials.",2312.10473v1
+2022-11-07,Quantum-classical approach to spin and charge pumping and the ensuing radiation in THz spintronics: Example of ultrafast-light-driven Weyl antiferromagnet Mn$_3$Sn,"The interaction of fs light pulses with magnetic materials has been intensely
+studied for more than two decades in order to understand ultrafast
+demagnetization in single magnetic layers or THz emission from their bilayers
+with nonmagnetic spin-orbit (SO) materials. Here we develop a multiscale
+quantum-classical formalism -- where conduction electrons are described by
+quantum master equation of the Lindblad type; classical dynamics of local
+magnetization is described by the Landau-Lifshitz-Gilbert (LLG) equation; and
+incoming light is described by classical vector potential while outgoing
+electromagnetic radiation is computed using Jefimenko equations for retarded
+electric and magnetic fields -- and apply it a bilayer of antiferromagnetic
+Weyl semimetal Mn$_3$Sn with noncollinear local magnetization in contact with
+SO-coupled nonmagnetic material. Our QME+LLG+Jefimenko scheme makes it possible
+to understand how fs light pulse generates directly spin and charge pumping and
+electromagnetic radiation by the latter, including both odd and even high
+harmonics (of the pulse center frequency) up to order $n \le 7$. The directly
+pumped spin current then exert spin torque on local magnetization whose
+dynamics, in turn, pumps additional spin and charge currents radiating in the
+THz range. By switching on and off LLG dynamics and SO couplings, we unravel
+which microscopic mechanism contribute the most to emitted THz radiation --
+charge pumping by local magnetization of Mn$_3$Sn in the presence of its
+intrinsic SO coupling is far more important than standardly assumed (for other
+types of magnetic layers) spin pumping and subsequent spin-to-charge conversion
+within the neighboring nonmagnetic SO-coupled material.",2211.03645v3
+2008-09-08,Jahn-Teller Inactivity and Magnetic Frustration in GeCo$_2$O$_4$ Probed by Ultrasound Velocity Measurements,"Ultrasound velocity measurements of cubic spinel GeCo$_2$O$_4$ in single
+crystal were performed for the investigation of shear and compression moduli.
+The shear moduli in the paramagnetic state reveal an absence of Jahn-Teller
+activity despite the presence of orbital degeneracy in the Co$^{2+}$ ions. Such
+a Jahn-Teller inactivity indicates that the intersite orbital-orbital
+interaction is much stronger than the Jahn-Teller coupling. The compression
+moduli in the paramagnetic state near the N$\acute{e}$el temperature $T_N$
+reveal that the most relevant exchange path for the antiferromagnetic
+transition lies in the [111] direction. This exchange-path anisotropy is
+consistent with the antiferromagnetic structure with the wave vector $q
+\parallel$ [111], suggesting the presence of bond frustration due to
+competition among a direct ferromagnetic and several distant-neighbors
+antiferromagnetic interactions. In the JT-inactive condition, the bond
+frustration can be induced by geometrical orbital frustration of
+$t_{2g}$-$t_{2g}$ interaction between the Co$^{2+}$ ions which can be realized
+in the pyrochlore lattice of the high spin Co$^{2+}$ with $t_{2g}$-orbital
+degeneracy. In GeCo$_2$O$_4$, the tetragonal elongation below $T_N$ releases
+the orbital frustration by quenching the orbital degeneracy.",0809.1263v1
+2014-12-01,Novel electronic behavior driving NdNiO3 metal-insulator transition,"We present evidence that the metal-insulator transition (MIT) in a tensile
+strained NdNiO3 (NNO) film is facilitated by a redistribution of electronic
+density and neither requires Ni charge disproportionation nor symmetry change
+[1, 2]. Given epitaxial tensile strain in thin NNO films induces preferential
+occupancy of the $e_g$ $d_{x^2-y^2}$ orbital ($s_{3z^2-r^2}$) we propose the
+larger transfer integral of this orbital state with the O 2p mediates a
+redistribution of electronic density from the Ni atom. A decrease in Ni
+$d_{x^2-y^2}$ orbital occupation is directly observed by resonant inelastic
+x-ray scattering below the MIT temperature. Furthermore, an increase in Nd
+charge occupancy is measured by x-ray absorption at the Nd L3 edge. Both
+spin-orbit coupling and crystal field effects combine to break the degeneracy
+of the Nd 5d states shifting the energy of the Nd $e_g$ $d_{x^2-y^2}$ orbital
+towards the Fermi level allowing the A site to become an active acceptor during
+the MI transition. This work identifies the relocation of electrons from the Ni
+3d to the Nd 5d orbitals across the MIT. We propose the insulating gap opens
+between the Ni 3d and O 2p resulting from Ni 3d electron localization mediated
+by charge loss. The transition seems neither purely Mott-Hubbard nor simple
+charge transfer.",1412.0676v3
+2016-01-15,Multiband $d-p$ model and self-doping in the electronic structure of Ba$_2$IrO$_4$,"We introduce and investigate the multiband $d-p$ model describing a IrO$_4$
+layer (such as realized in Ba$_2$IrO$_4$) where all $34$ orbitals per unit cell
+are partly occupied, i.e., $t_{2g}$ and $e_g$ orbitals at iridium and $2p$
+orbitals at oxygen ions. The model takes into account anisotropic
+iridium-oxygen $d-p$ and oxygen-oxygen $p-p$ hopping processes, crystal-field
+splittings, spin-orbit coupling, and the on-site Coulomb interactions, both at
+iridium and at oxygen ions. We show that the predictions based on assumed
+idealized ionic configuration (with $n_0=5+4\times 6=29$ electrons per IrO$_4$
+unit) do not explain well the independent \textit{ab initio} data and the
+experimental data for Ba$_2$IrO$_4$. Instead we find that the total electron
+density in the $d-p$ states is smaller, $n=29-x<n_0$ ($x>0$). When we fix
+$x=1$, the predictions for the $d-p$ model become more realistic and weakly
+insulating antiferromagnetic ground state with the moments lying within IrO$_2$
+planes along (110) direction is found, in agreement with experiment and
+\textit{ab initio} data. We also show that: (i) holes delocalize over the
+oxygen orbitals and the electron density at iridium ions is enhanced, hence
+(ii) their $e_g$ orbitals are occupied by more than one electron and have to be
+included in the multiband $d-p$ model describing iridates.",1601.03985v1
+2020-08-12,Tidal Dissipation Impact on the Eccentric Onset of Common Envelope Phases in Massive Binary Star Systems,"Tidal dissipation due to turbulent viscosity in the convective regions of
+giant stars plays an important role in shaping the orbits of pre-common
+envelope systems. Such systems are possible sources of transients and close
+compact binary systems that will eventually merge and produce detectable
+gravitational wave signals. Most previous studies of the onset of common
+envelope episodes have focused on circular orbits and synchronously rotating
+donor stars under the assumption that tidal dissipation can quickly spin up the
+primary and circularize the orbit before the binary reaches Roche-lobe overflow
+(RLO). We test this assumption by coupling numerical models of the post main
+sequence stellar evolution of massive-stars with the model for tidal
+dissipation in convective envelopes developed in Vick & Lai (2020) $-$ a tidal
+model that is accurate even for highly eccentric orbits with small pericentre
+distances. We find that, in many cases, tidal dissipation does not circularize
+the orbit before RLO. For a $10~M_\odot$ ($15~M_\odot$) primary star
+interacting with a $1.4~M_\odot$ companion, systems with pericentre distances
+within 3 AU (6 AU) when the primary leaves the main sequence will retain the
+initial orbital eccentricity when the primary grows to the Roche radius. Even
+in systems that tidally circularize before RLO, the donor star may be rotating
+subsynchronously at the onset of mass transfer. Our results demonstrate that
+some possible precursors to double neutron star systems are likely eccentric at
+the Roche radius. The effects of pre-common envelope eccentricity on the
+resulting compact binary merit further study.",2008.05476v2
+2015-08-07,Correlation-enhanced odd-parity inter-orbital singlet pairing in the iron-pnictide superconductor LiFeAs,"The rich variety of iron-based superconductors and their complex electronic
+structure lead to a wide range of possibilities for gap symmetry and pairing
+components. Here we solve in the 2-Fe Brillouin zone the full
+frequency-dependent linearized Eliashberg equations for LiFeAs with
+spin-fluctuation mediated pairing interactions. The magnetic excitations are
+calculated with the random phase approximation on a correlated electronic
+structure obtained with density functional theory and dynamical mean field
+theory. Correlations induce long-lived local moments with orbital-dependent
+dynamics. The interaction between electrons through Hund's coupling promotes
+inter-orbital magnetic susceptibility. As a consequence, the leading pairing
+channel, conventional $s^{+-}$, acquires sizeable inter-orbital
+$d_{xy}-d_{xz(yz)}$ singlet pairing with odd parity under glide-plane symmetry.
+These components reduce the superconducting gap magnitude induced by the
+intra-orbital components of the gap function at the electron pockets
+intersection where the Fe-d $t_{2g}$ orbitals strongly mix. This in turn makes
+the results consistent with available experiments on the angular dependence of
+the gaps observed on the different Fermi surfaces.",1508.01789v4
+2023-07-31,The Perturbed Full Two-Body Problem: Application to Post-DART Didymos,"With the successful impact of the NASA DART spacecraft in the
+Didymos-Dimorphos binary asteroid system, we provide an initial analysis of the
+post-impact perturbed binary asteroid dynamics. To compare our simulation
+results with observations, we introduce a set of ""observable elements""
+calculated using only the physical separation of the binary asteroid, rather
+than traditional Keplerian elements. Using numerical methods that treat the
+fully spin-orbit-coupled dynamics, we estimate the system's mass and the
+impact-induced changes in orbital velocity, semimajor axis, and eccentricity.
+We find that the changes to the mutual orbit depend strongly on the separation
+distance between Didymos and Dimorphos at the time of impact. If Dimorphos
+enters a tumbling state after the impact, this may be observable through
+changes in the system's eccentricity and orbit period. We also find that any
+DART-induced reshaping of Dimorphos would generally reduce the required change
+in orbital velocity to achieve the measured post-impact orbit period and will
+be assessed by the ESA Hera mission in 2027.",2307.16777v1
+2023-09-05,"On the origin of circular dichroism in angular resolved photoemission from graphene, graphite, and WSe$_2$ family of materials","Circular dichroism in angle-resolved photoemission (CD-ARPES) is one of the
+promising techniques for obtaining experimental insight into topological
+properties of novel materials, in particular to the orbital angular momentum
+(OAM) in dispersive bands, which might be related, albeit certainly in a
+non-trivial way, to the momentum resolved Berry curvature of the bands.
+Therefore, it is important to understand how non-vanishing CD-ARPES signal
+arises in graphene, a material where Dirac bands are made from C $|2p_z\rangle$
+orbitals that carry zero OAM, spin-orbit-coupling (SOC) can be neglected, and
+Berry curvature effectively vanishes. Dubs et al., Phys. Rev. B 32, 8389 (1985)
+have demonstrated non-vanishing cricular dichroism in angular distribution
+(CDAD) from an oriented $p_z$ orbital, and this process can be responsible for
+the experimentally observed CD-ARPES in graphene. In this paper, we derive the
+CD-ARPES from $p_z$ orbitals by elementary means, using only simple algebraic
+formulas and tabulated numerical values, and show that it leads to significant
+CD-ARPES signal over the entire vacuum ultraviolet and soft x-ray energy range,
+with an exception of the photon energy region near $h\nu \approx 40$ eV. We
+also demonstrate that another process, emerging from the finite electron
+inelastic mean free path, also leads to CD-ARPES of the potentially similar
+order of magnitude, as previously discussed by Moser, J. Electron Spectrosc.
+Relat. Phenom. 214, 29 (2017). We present calculated CDAD maps for selected
+orbitals and briefly discuss the consequences of the findings for CD-ARPES,
+focusing on graphene, graphite and WSe$_2$.",2309.02187v1
+2012-07-30,"Aligned Spins: Orbital Elements, Decaying Orbits, and Last Stable Circular Orbit to high post-Newtonian Orders","In this article the quasi-Keplerian parameterisation for the case that spins
+and orbital angular momentum in a compact binary system are aligned or
+anti-aligned with the orbital angular momentum vector is extended to 3PN
+point-mass, next-to-next-to-leading order spin-orbit, next-to-next-to-leading
+order spin(1)-spin(2), and next-to-leading order spin-squared dynamics in the
+conservative regime. In a further step, we use the expressions for the
+radiative multipole moments with spin to leading order linear and quadratic in
+both spins to compute radiation losses of the orbital binding energy and
+angular momentum. Orbital averaged expressions for the decay of energy and
+eccentricity are provided. An expression for the last stable circular orbit is
+given in terms of the angular velocity type variable $x$.",1207.6961v2
+2012-07-12,Fingerprints of spin-orbital entanglement in transition metal oxides,"The concept of spin-orbital entanglement on superexchange bonds in transition
+metal oxides is introduced and explained on several examples. It is shown that
+spin-orbital entanglement in superexchange models destabilizes the long-range
+(spin and orbital) order and may lead either to a disordered spin-liquid state
+or to novel phases at low temperature which arise from strongly frustrated
+interactions. Such novel ground states cannot be described within the
+conventionally used mean field theory which separates spin and orbital degrees
+of freedom. Even in cases where the ground states are disentangled,
+spin-orbital entanglement occurs in excited states and may become crucial for a
+correct description of physical properties at finite temperature. As an
+important example of this behaviour we present spin-orbital entanglement in the
+$R$VO$_3$ perovskites, with $R$=La,Pr,...,Yb,Lu, where such finite temperature
+properties of these compounds can be understood only using entangled states:
+($i$) thermal evolution of the optical spectral weights, ($ii$) the dependence
+of transition temperatures for the onset of orbital and magnetic order on the
+ionic radius in the phase diagram of the $R$VO$_3$ perovskites, and ($iii$)
+dimerization observed in the magnon spectra for the $C$-type antiferromagnetic
+phase of YVO$_3$. Finally, it is shown that joint spin-orbital excitations in
+an ordered phase with coexisting antiferromagnetic and alternating orbital
+order introduces topological constraints for the hole propagation and will thus
+radically modify transport properties in doped Mott insulators where hole
+motion implies simultaneous spin and orbital excitations.",1207.3010v1
+2017-01-20,Probing dark excitons in atomically thin semiconductors via near-field coupling to surface plasmon polaritons,"Transition metal dichalcogenide (TMD) monolayers are direct bandgap
+semiconductors that feature tightly bound excitons, strong spin-orbit coupling,
+and spin-valley degrees of freedom. Depending on the spin configuration of the
+electron-hole pairs, intra-valley excitons of TMD monolayers can be either
+optically bright or dark. Dark excitons involve nominally spin-forbidden
+optical transitions with zero in-plane transition dipole moment, making their
+detection with conventional far-field optical techniques challenging. Here, we
+introduce a new method for probing the optical properties of two-dimensional
+(2D) materials via near-field coupling to surface plasmon polaritons (SPPs),
+which selectively enhances optical transitions with dipole moments normal to
+the 2D plane. We utilize this method to directly detect dark excitons in
+monolayer TMDs. When a WSe2 monolayer is placed on top of a single-crystal
+silver film, its emission into near-field-coupled SPPs displays new spectral
+features whose energies and dipole orientations are consistent with dark
+neutral and charged excitons. The SPP-based near-field spectroscopy
+significantly enhances experimental capabilities for probing and manipulating
+exciton dynamics of atomically thin materials.",1701.05938v1
+2019-02-13,Metamagnetism stabilized giant magnetoelectric coupling in ferroelectric \textit{x}BaTiO${_3}$-(1-\textit{x})BiCoO${_3}$ solid solution,"In order to establish the correlation between the magnetoelectric coupling
+and magnetic instability, we have studied the structural, magnetic, and
+ferroelectric properties of \textit{x}BaTiO${_3}$-(1-\textit{x})BiCoO${_3}$ as
+a function of BaTiO$_3$ concentration ($x$) and volume.The $G-$type
+antiferromagnetic ordering is found to be energetically favorable for $x<$ 0.45
+and higher concentrations stabilize with nonmagnetic states. We observe
+metamagnetic spin state transitions associated with paraelectric to
+ferrolectric transitions as a function of volume and $x$ using synchrotron
+diffraction and computational studies, indicating a strong magnetoelectric
+coupling. Specifically for $x=$ 0.33 composition, a pressure induced high spin
+(HS) to low spin (LS) transition occurs when the volume is compressed below
+5\%. Our orbital$-$projected density of states show a HS state for Co$^{3+}$ in
+the ferroelectric ground state for $x<$ 0.45 and the corresponding paraelectric
+phase is stable in the nonmagnetic state due to the stabilization of LS state
+as evident from our fixed$-$spin$-$moment calculations and magnetic
+measurements. High values of spontaneous ferroelectric polarizations are
+predicted for lower $x$ values which inversely vary with $x$ because of the
+reduction of tetragonality ($c/a$) with increase in $x$. Moreover, we find that
+the HS$-$LS transition point and magnetoelectric coupling strength can be
+varied by $x$.",1902.05013v1
+2006-08-04,Kondo Effects in Carbon Nanotubes: From SU(4) to SU(2) symmetry,"We study the Kondo effect in a single-electron transistor device realized in
+a single-wall carbon nanotube. The K-K' double orbital degeneracy of a
+nanotube, which originates from the peculiar two-dimensional band structure of
+graphene, plays the role of a pseudo-spin. Screening of this pseudo-spin,
+together with the real spin, can result in an SU(4) Kondo effect at low
+temperatures. For such an exotic Kondo effect to arise, it is crucial that this
+orbital quantum number is conserved during tunneling. Experimentally, this
+conservation is not obvious and some mixing in the orbital channel may occur.
+Here we investigate in detail the role of mixing and asymmetry in the tunneling
+coupling and analyze how different Kondo effects, from the SU(4) symmetry to a
+two-level SU(2) symmetry, emerge depending on the mixing and/or asymmetry. We
+use four different theoretical approaches to address both the linear and
+non-linear conductance for different values of the external magnetic field. Our
+results point out clearly the experimental conditions to observe exclusively
+SU(4) Kondo physics. Although we focus on nanotube quantum dots, our results
+also apply to vertical quantum dots. We also mention that a finite amount of
+orbital mixing corresponds, in the pseudospin language, to having non-collinear
+leads with respect to the orbital ''magnetization'' axis which defines the two
+pseudospin orientations in the nanotube quantum dot. In this sense, some of our
+results are also relevant to the problem of a Kondo quantum dot coupled to
+non-collinear ferromagnetic leads.",0608110v3
+2019-03-18,Orbital-selective bad metals due to Hund's rule and orbital anisotropy: a finite-temperature slave-spin treatment of the two-band Hubbard model,"We study the finite-temperature properties of the half-filled two-band
+Hubbard model in the presence of Hund's rule coupling and orbital anisotropy.
+We use the mean-field treatment of the $Z_2$ slave-spin theory with a
+finite-temperature extension of the zero-temperature gauge variable previously
+developed by Hassan and de' Medici
+http://dx.doi.org/10.1103/PhysRevB.81.035106}{Phys. Rev. B {\bf 81}, 035106
+(2010)}]. We consider the instability of the Fermi liquid phases and how it is
+enhanced by the Hund's rule. We identify paramagnetic solutions that have zero
+quasi-particle weight with bad metallic phases, and the first-order transition
+temperature between it and the Fermi liquid phase as a coherence temperature
+that signals the crossover to the bad metallic state. When orbital anisotropy
+is present, we found an intermediate transition to an orbital-selective bad
+metal (OSBM), where the narrow band becomes a bad metal while the wide band
+remains a renormalised Fermi liquid. The temperatures $T_\textrm{coh}$ and
+$T_\textrm{OSBM}$ at which the system transitions to the bad metal phases can
+be orders of magnitude less than the Fermi temperature associated with the
+non-interacting band. The parameter dependence of the temperature at which the
+OSBM is destroyed can be understood in terms of a ferromagnetic Kondo-Hubbard
+lattice model. In general, Hund's rule coupling enhances the bad metallic
+phases, reduce interorbital charge fluctuations and increase spin fluctuations.
+The qualitative difference found in the ground state whether the Hund's rule is
+present or not, related to the degeneracy of the low energy manifold, is also
+maintained for finite temperatures.",1903.07237v3
+2023-03-08,Spin-orbital mechanisms for negative thermal expansion in Ca2RuO$_4$,"The phenomenon of negative thermal expansion (NTE) deals with the increase of
+the lattice parameters and the volume of the unit cell when the material is
+thermally cooled. The NTE is typically associated with thermal phonons and
+anomalous spin-lattice coupling at low temperatures. However, the underlying
+mechanisms in the presence of strong electron correlations in multi-orbital
+systems are not yet fully established. Here, we investigate the role of Coulomb
+interaction in the presence of lattice distortions in setting out the NTE
+effect, by focusing on the physical case of layered Ca$_2$RuO$_4$ with $d^4$
+configuration at each Ru ion site. We employ the Slater-Koster parametrization
+to describe the electron-lattice coupling through the dependence of the $d-p$
+hybridization on the Ru-O-Ru bond angle. The evaluation of the minimum of the
+free energy at finite temperature by fully solving the multi-orbital many-body
+problem on finite size cluster allows us to identify the regime for which the
+system is prone to exhibit NTE effects. The analysis shows that the nature of
+the spin-orbital correlations is relevant to drive the reduction of the bond
+angle by cooling, and in turn the tendency toward a NTE. This is confirmed by
+the fact that a changeover of the electronic and orbital configuration from
+$d^4$ to $d^3$ by transition metal substitution is shown to favor the
+occurrence of NTE in Ca$_2$RuO$_4$. This finding is in agreement with the
+experimental observations of a NTE effect which is significantly dependent on
+the transition metal substitution in the Ca$_2$RuO$_4$ compound.",2303.04951v1
+2005-07-07,Conservation of spin current,"The conventional definition of spin-current, namely spin density multiplied
+by the group velocity, is not a conserved quantity due to possible spin
+rotations caused by spin-orbit (SO) interaction. However, in a model with
+spin-spin interactions, rotation of a spin causes a dynamic response of
+surrounding spins that opposes the rotation. Such a many-body effect restores
+the spin-current conservation. Here we prove that the non-conservation problem
+of spin-current can be resolved if a self-consistent spin-spin interaction is
+included in the analysis. We further derive a spin-conductance formula which
+partitions spin-current into different leads of a multi-lead conductor.",0507159v2
+2014-05-06,Spin-orbit-induced circulating currents in a semiconductor nanostructure,"Circulating orbital currents produced by the spin-orbit interaction for a
+single electron spin in a quantum dot are explicitly evaluated at zero magnetic
+field, along with their effect on the total magnetic moment (spin and orbital)
+of the electron spin. The currents are dominated by coherent superpositions of
+the conduction and valence envelope functions of the electronic state, are
+smoothly varying within the quantum dot, and are peaked roughly halfway between
+the dot center and edge. Thus the spatial structure of the spin contribution to
+the magnetic moment (which is peaked at the dot center) differs greatly from
+the spatial structure of the orbital contribution. Even when the spin and
+orbital magnetic moments cancel (for $g=0$) the spin can interact strongly with
+local magnetic fields, e.g. from other spins, which has implications for spin
+lifetimes and spin manipulation.",1405.1151v1
+2018-03-16,Intrinsic spin-orbit torque in an antiferromagnet with a weakly noncollinear spin configuration,"An antiferromagnet is a promising material for spin-orbit torque generation.
+Earlier studies of the spin-orbit torque in an antiferromagnet are limited to
+collinear spin configurations. We calculate the spin-orbit torque in an
+antiferromagnet whose spin ordering is weakly noncollinear. Such
+noncollinearity may be induced spontaneously during the magnetization dynamics
+even when the equilibrium spin configuration is perfectly collinear. It is
+shown that deviation from perfect collinearity can modify properties of the
+spin-orbit torque since noncollinearity generates extra Berry phase
+contributions to the spin-orbit torque, which are forbidden for collinear spin
+configurations. In sufficiently clean antiferromagnets, this modification can
+be significant. We estimate this effect to be of relevance for fast
+antiferromagnetic domain wall motion.",1803.06428v2
+1995-07-24,Double Degeneracy and Jahn-Teller Effects in CMR Perovskites,"Jahn-Teller (JT) electron-phonon coupling effects in the colossal
+magnetoresistance perovskite compounds $La_{1-x}A_xMnO_3$ are investigated.
+Electron-electron correlations between two degenerate Mn $e_g$ orbitals are
+studied in the Gutzwiller approximation. The static JT distortion and
+antiadiabatic polaron effects are studied in a modified Lang-Firsov
+approximation. We find that (i) the electron or hole character of the charge
+carrier depends on the static JT distortion, and (ii) due to the two-component
+nature of the JT coupling, fluctuations in the JT distortion direction
+contribute to the charge transport in similar fashion as the local spins.",9507097v1
+1996-02-29,Theory of Non-Reciprocal Optical Effects in Antiferromagnets: The Case Cr_2O_3,"A microscopic model of non-reciprocal optical effects in antiferromagnets is
+developed by considering the case of Cr_2O_3 where such effects have been
+observed. These effects are due to a direct coupling between light and the
+antiferromagnetic order parameter. This coupling is mediated by the spin-orbit
+interaction and involves an interplay between the breaking of inversion
+symmetry due to the antiferromagnetic order parameter and the trigonal field
+contribution to the ligand field at the magnetic ion. We evaluate the matrix
+elements relevant for the non-reciprocal second harmonic generation and
+gyrotropic birefringence.",9602159v2
+1999-07-13,Theory of the pi state in 3He Josephson junctions,"The flow of superfluid 3He-B through a 65 x 65 array of nanometer size
+apertures has been measured recently by Backhaus et al. They find in the
+current--phase relation a new branch, so-called pi state. We study two limiting
+cases which show that the pi state arises from coupling of the phase degree of
+freedom to the spin-orbit rotation. The pi state exists in a single large
+aperture, but is difficult to observe because of hysteresis. A better
+correspondence with experiments is obtained by assuming a thin wall, where the
+Josephson coupling between the two sides arises from a dense array of
+pin-holes.",9907181v1
+2001-09-06,Lattice-Spin Mechanism in Colossal Magnetoresistant Manganites,"We present a single-orbital double-exchange model, coupled with cooperative
+phonons (the so called breathing-modes of the oxygen octahedra in manganites).
+The model is studied with Monte Carlo simulations. For a finite range of doping
+and coupling constants, a first-order Metal-Insulator phase transition is
+found, that coincides with the Paramagnetic-Ferromagnetic phase transition. The
+insulating state is due to the self-trapping of every carrier within an oxygen
+octahedron distortion.",0109127v2
+2002-07-12,Electronic Ferroelectricity in the Falicov-Kimball Model,"I show that a spontaneous electric polarization is developed in the solution
+of the Falicov-Kimball model (FKM) by mapping the strong coupling limit of the
+model into an $xxz$ spin 1/2 model with a magnetic field. In this way, I can
+determine the phase diagram of the strongly interacting model that shows a
+transition to a mixed valence regime containing two phases: orbital ordering
+and Bose-Einstein condensation of excitons with a built in electric
+polarization. The results are extended to the intermeditate and weak coupling
+regimes.",0207331v2
+2003-04-24,On Superconducting Double Transition in PrOs_4_Sb_12,"Superconducting double transition in PrOs_4_Sb_12 is investigated by
+analyzing the anisotropy of the upper critical field H_c2 in the ab-plane, and
+the possible pairing state is discussed. When mixing due to gradient coupling
+is active, the twofold-symmetric component is necessarily induced in the
+fourfold symmetric phase, leading to the twofold oscillation of H_c2, contrary
+to the experimental result. To avoid the mixing effect, the weak spin-orbit
+coupling triplet pairing state is considered as a likely pairing function,
+where time-reversal symmetry is broken.",0304538v1
+2003-09-16,Superconducting states in the tetrahedral compound PrOs4Sb12,"We find possible superconducting states for tetrahedral (Th) symmetry
+crystals with strong spin-orbit coupling using Landau theory. Additional
+symmetry breaking within the superconducting state is considered. We discuss
+nodes of the gap functions for the different states, secondary superconducting
+order parameters and coupling to the elastic strain. By comparing our results
+to experiments, we find that superconductivity in PrOs4Sb12 is best described
+by the three-dimensional representations of point group Th.",0309382v2
+2004-04-21,Theory of Coupled Multipole Moments Probed by X-ray Scattering in CeB$_6$,"A minimal model for multipole orders in CeB$_6$ shows that degeneracy of the
+quadrupole order parameters and strong spin-orbit coupling lead to peculiar
+temperature and magnetic-field dependences of the X-ray reflection intensity at
+superlattice Bragg points. Furthermore, the intensity depends sensitively on
+the surface direction. These theoretical results explain naturally recent X-ray
+experiments in phases II and III of CeB$_6$. It is predicted that under weak
+magnetic field perpendicular to the (111) surface, the reflection intensity
+should change non-monotonically as a function of temperature.",0404498v1
+2005-01-19,Effective quantum dimer model for trimerized kagome antiferromagnet,"An effective spin-orbit Hamiltonian is derived for a spin-1/2 trimerized
+kagome antiferromagnet in the second-order of perturbation theory in the ratio
+of two coupling constants. Low-energy singlet states of the obtained model are
+mapped to a quantum dimer model on a triangular lattice. The quantum dimer
+model is dominated by dimer resonances on a few shortest loops of the
+triangular lattice. Characteristic energy scale for the dimer model constitutes
+only a small fraction of the weaker exchange coupling constant.",0501460v1
+2006-08-17,Fano-Rashba effect in a quantum wire,"We predict the occurrence of Fano lineshapes in a semiconductor quantum wire
+with local spin-orbit (Rashba) coupling. We show that the Rashba interaction
+acts in a strictly one dimensional channel as an attractive impurity, leading
+to the formation of purely bound states. In a quasi-one dimensional system
+these bound states couple to the conduction ones through the Rashba
+intersubband mixing, giving rise to pronounced dips in the linear conductance
+plateaus. We give exact numerical results and propose an approximate model
+capturing the main ingredients of the effect.",0608392v2
+2006-08-22,The magnetic orders induced ferroelectricity,"We studied the ferroelectricity of magnetic oxides in which its emergence
+coincides with the onset of a second incommensurate magnetic order. We solved
+for the wave function of e_{g} electrons in the presence of magnetic orders.
+The coupling between the magnetic and electric orders is provided by the
+spin-orbit interaction. It was found that the net electric dipole moment of the
+system came from the bond between the transition metal and oxygen atoms. The
+anisotropy of d-orbitals also played an important role. Finally, the form of
+the coupling leads us to the conclusion that it is an improper
+ferroelectricity.",0608470v1
+2003-10-30,Gravitomagnetic effect and spin-torsion coupling,"We study the gravitomagnetic effect in the context of absolute parallelism
+with the use of a modified geodesic equation via a free parameter b. We
+calculate the time difference in two atomic clocks orbiting the Earth in
+opposite directions and find a small correction due to the coupling between the
+torsion of the spacetime and the internal structure of atomic clocks measured
+by the free parameter.",0310131v1
+1996-08-13,A new effective Lagrangian for nuclear matter,"The relativistic mean field model, the Zim\'anyi - Moszkowski (ZM) Lagrangian
+describes nuclear matter and stable finite nuclei even in the non-relativistic
+limit. It fails, however, to predict the correct non-relativistic spin-orbit
+(SO) coupling. In this paper we improve on this matter by an additional tensor
+coupling analogous to the anomalous gyromagnetic ratio. It can be adjusted to
+describe the SO-term without changing the mean field solution of the
+ZM-Lagrangian for nuclear matter.",9608021v1
+1998-09-11,On the relativistic L-S coupling,"The fact that the Dirac equation is linear in the space and time derivatives
+leads to the coupling of spin and orbital angular momenta that is of a pure
+relativistic nature. We illustrate this fact by computing the solutions of the
+Dirac equation in an infinite spherical well, which allows to go from the
+relativistic to the non-relativistic limit by just varying the radius of the
+well.",9809015v1
+2007-06-14,Physical properties of the noncentrosymmetric superconductor Mg_10Ir_19B_16,"Specific heat, electrical resistivity, and magnetic susceptibility
+measurements on a high quality sample of Mg10Ir19B16 provide a self-consistent
+determination of its superconducting properties. They indicate that Mg10Ir19B16
+is a type-II superconductor (Tc=4.45K, k(0)=20), with an electron-phonon
+coupling constant l_ep=0.66. An analysis of the T-dependent specific heat shows
+that superconducting properties are dominated by an s-wave gap (D=0.7 meV).
+Point contact tunneling data provide evidence for multiple superconducting
+gaps, as expected from strong asymmetric spin-orbit coupling.",0706.2177v2
+2008-04-29,Angular Momentum Coupling and Rabi Frequencies for Simple Atomic Transitions,"The Rabi frequency (coupling strength) of an electric-dipole transition is an
+important experimental parameter in laser-cooling and other atomic physics
+experiments. Though the relationship between Rabi frequency and atomic
+wavefunctions and/or atomic lifetimes is discussed in many references, there is
+a need for a concise, self-contained, accessible introduction to such
+calculations suitable for use by the typical student of laser cooling
+(experimental or theoretical). In this paper, I outline calculations of the
+Rabi frequencies for atoms with sub-structure due to orbital, spin and nuclear
+angular momentum. I emphasize the physical meaning of the calculations.",0804.4528v1
+2008-06-25,A Neutron diffraction study of multiferroics RMn2O5,"The magnetic properties of RMn2O5 multiferrroics as obtained by unpolarized
+and polarized neutron diffraction experiments are reviewed. We discuss the
+qualitative features of the magnetic phase diagram both in zero magnetic field
+and in field and analyze the commensurate magnetic structure and its coupling
+to an applied electric field. The origin of ferrolectricity is discussed based
+on calculations of the ferroelectric polarization predicted by different
+microscopic coupling mechanisms (exchange striction and cycloidal spin-orbit
+models). A minimal model containing a small set of parameters is also presented
+in order to understand the propagation of the magnetic structure along the
+c-direction.",0806.4128v1
+2010-01-27,Semi-Holographic Fermi Liquids,"We show that the universal physics of recent holographic non-Fermi liquid
+models is captured by a semi-holographic description, in which a dynamical
+boundary field is coupled to a strongly coupled conformal sector having a
+gravity dual. This allows various generalizations, such as a dynamical exponent
+and lattice and impurity effects. We examine possible relevant deformations,
+including multi-trace terms and spin-orbit effects. We discuss the matching
+onto the UV theory of the earlier work, and an alternate description in which
+the boundary field is integrated out.",1001.5049v2
+2010-03-05,Giant magneto-elastic coupling in a metallic helical metamagnet,"Using high resolution neutron diffraction and capacitance dilatometry we show
+that the thermal evolution of the helimagnetic state in CoMnSi is accompanied
+by a change in inter-atomic distances of up to 2%, the largest ever found in a
+metallic magnet. Our results and the picture of competing exchange and strongly
+anisotropic thermal expansion that we use to understand them sheds light on a
+new mechanism for large magnetoelastic effects that does not require large
+spin-orbit coupling.",1003.1206v3
+2011-01-14,Non-Spinning Black Holes in Alternative Theories of Gravity,"We study two large classes of alternative theories, modifying the action
+through algebraic, quadratic curvature invariants coupled to scalar fields. We
+find one class that admits solutions that solve the vacuum Einstein equations
+and another that does not. In the latter, we find a deformation to the
+Schwarzschild metric that solves the modified field equations in the small
+coupling approximation. We calculate the event horizon shift, the innermost
+stable circular orbit shift, and corrections to gravitational waves, mapping
+them to the parametrized post-Einsteinian framework.",1101.2921v2
+2012-08-31,Coupled Ferromagnetic and Nematic Ordering of Fermions in an Optical Flux Lattice,"Ultracold atoms in Raman-dressed optical lattices allow for effective
+momentum-dependent interactions among single-species fermions originating from
+short-range s-wave interactions. These dressed-state interactions combined with
+very flat bands encountered in the recently introduced optical flux lattices
+push the Stoner instability towards weaker repulsive interactions, making it
+accessible with current experiments. As a consequence of the coupling between
+spin and orbital degrees of freedom, the magnetic phase features Ising nematic
+order.",1208.6540v3
+2013-01-30,Fractional Helical Liquids and Non-Abelian Anyons in Quantum Wires,"We study one dimensional wires with spin-orbit coupling. We show that in the
+presence of Zeeman field and strong electron-electron interaction a clean wire
+may form fractional helical liquid states with phenomenology similar to
+fractional quantum Hall liquids. Most notably, the wire's two terminal
+conductance is predicted to show fractional quantized conductance plateaus at
+low electron density. When the system is proximity-coupled to a superconductor,
+fractional Majorana bound states may be stabilized. We discuss how disorder
+destabilizes these fractional phases. Possible experimental realizations of
+similar states in double wire systems are discussed.",1301.7335v1
+2013-05-18,Excitonic Collapse in Semiconducting Transition Metal Dichalcogenides,"Semiconducting transition metal dichalcogenides (STMDC) are two-dimensional
+(2D) crystals characterized by electron volt size band gaps, spin-orbit
+coupling (SOC), and d-orbital character of its valence and conduction bands. We
+show that these materials carry unique exciton quasiparticles (electron-hole
+bound states) with energy within the gap but which can ``collapse'' in the
+strong coupling regime by merging into the band structure continuum. The
+exciton collapse seems to be a generic effect in these 2D crystals.",1305.4278v2
+2013-11-15,Route to observing topological edge modes in ultracold fermions,"We show how to exploit the rich hyperfine structure of fermionic alkali atoms
+to produce a quasi-1D topological superfluid while avoiding excessive heating
+from off-resonant scattering. We model interacting fermions where four
+hyperfine states are coupled by a variety of optical and microwave fields. We
+calculate the local density of states in a trap, finding regimes with zero
+energy topological edge modes. Heating rates in this system are significantly
+suppressed compared to simple Raman-induced spin-orbit coupling approaches.",1311.3892v2
+2014-11-06,Double path interference and magnetic oscillations in Cooper pair transport through a single nanowire,"We show that the critical current of the Josephson junction consisting of
+superconducting electrodes coupled through a nanowire with two conductive
+channels can reveal the multi-periodic magnetic oscillations. The
+multi-periodicity originates from the quantum mechanical interference between
+the channels affected by both the strong spin-orbit coupling and Zeeman
+interaction. This minimal two-channel model is shown to explain the complicated
+interference phenomena observed recently in Josephson transport through Bi
+nanowires.",1411.1626v1
+2014-12-03,Proximity-induced ferromagnetism in graphene revealed by anomalous Hall effect,"We demonstrate the anomalous Hall effect (AHE) in single-layer graphene
+exchange-coupled to an atomically flat yttrium iron garnet (YIG) ferromagnetic
+thin film. The anomalous Hall conductance has magnitude of ~0.09(2e2/h) at low
+temperatures and is measurable up to ~ 300 K. Our observations indicate not
+only proximity-induced ferromagnetism in graphene/YIG with large exchange
+interaction, but also enhanced spin-orbit coupling which is believed to be
+inherently weak in ideal graphene. The proximity-induced ferromagnetic order in
+graphene can lead to novel transport phenomena such as the quantized AHE which
+are potentially useful for spintronics.",1412.1521v1
+2015-01-09,Enhancing triplet superconductivity by the proximity to a singlet superconductor in oxide heterostructures,"We show how in principle a coherent coupling between two superconductors of
+opposite parity can be realized in a three-layer oxide heterostructure. Due to
+strong intraionic spin-orbit coupling in the middle layer, singlet Cooper pairs
+are converted into triplet ones and vice versa. This results in a large
+enhancement of the triplet superconductivity, persisting well above the native
+triplet critical temperature.",1501.02077v2
+2015-03-10,Characterization of the Heavy Metal Pyrochlore Lattice Superconductor CaIr2,"We report the electronic properties of the cubic laves phase superconductor
+CaIr2 (Tc = 5.8 K), in which the Ir atoms have a Pyrochlore lattice. The
+estimated superconducting parameters obtained from magnetization and specific
+heat measurements indicate that CaIr2 is a weakly coupled BCS superconductor.
+Electronic band structure calculations show that the Ir d-states are dominant
+at the Fermi level, creating a complex Fermi surface that is impacted
+substantially by spin orbit coupling.",1503.02744v1
+2015-09-14,Crystallization of fractional charges in a strongly interacting quasi-helical quantum dot,"The ground-state electron density of a one-dimensional spin-orbit coupled
+quantum dot with a Zeeman term and strong electron interaction is studied at
+the fractional helical liquid points. We show that at fractional filling
+factors $\nu=(2n+1)^{-1}$ (with $n$ a non-negative integer) the density
+oscillates with $N_{0}/\nu$ peak. For $n\geq 1$ a number of peaks larger than
+the number of electrons $N_{0}$ suggests that a crystal of fractional
+quasi-particles with charge $\nu e$ (with $e$ the electron charge) occurs. The
+reported effect is amenable of verification via transport measurements in
+charged AFM-coupled dot.",1509.03965v1
+2017-01-11,Theory of Quantum Oscillations of Magnetization in Kondo Insulators,"The Kondo lattice model of spin-1/2 local moments coupled to the conduction
+electrons at half-filling is studied for its orbital response to magnetic field
+on bipartite lattices. Through an effective charge dynamics, in a canonical
+representation of electrons that appropriately describes the Kondo insulating
+ground state, the magnetization is found to show de Haas-van Alphen
+oscillations from intermediate to weak Kondo coupling. These oscillations are
+ascribed to Lifshitz-like inversion of a dispersion of the gapped
+quasiparticles, whose chemical potential surface is measured by the oscillation
+frequency. Such oscillations are also predicted to occur in spin-density wave
+insulators.",1701.02825v2
+2017-05-28,Mechanisms of localization in isotope-substituted dynamical Jahn-Teller systems,"The mechanisms of localization of Jahn-Teller deformations and vibronic
+wavefunctions in isotope substituted dynamical Jahn-Teller systems are
+elucidated. It is found that the localization in the trough is of potential
+type in the case of strong vibronic coupling, while it becomes of kinetic type
+in the case of intermediate and weak coupling. It is shown that the vibronic
+levels in the linear $E\otimes e$-problem remain double degenerate upon
+arbitrary isotope substitution on the reasons similar to time reversal symmetry
+in which the role of spin is played by orbital pseudospin.",1705.09959v1
+2021-04-01,Ultrafast dynamics with the exact factorization,"The exact factorization of the time-dependent electron-nuclear wavefunction
+has been employed successfully in the field of quantum molecular dynamics
+simulations for interpreting and simulating light-induced ultrafast processes.
+In this work, we summarize the major developments leading to the formulation of
+a trajectory-based approach, derived from the exact factorization equations,
+capable of dealing with nonadiabatic electronic processes, and including
+spin-orbit coupling and the non-perturbative effect of an external
+time-dependent field. This trajectory-based quantum-classical approach has been
+dubbed coupled-trajectory mixed quantum-classical (CT-MQC) algorithm, whose
+performance is tested here to study the photo-dissociation dynamics of IBr.",2104.00738v1
+2019-05-23,Devil's staircase structures in $\varphi_{0}$ junction,"The superconductor-ferromagnet-superconductor $\varphi_{0}$ junction provides
+a direct coupling between Josephson phase and magnetic moment of ferromagnetic
+barrier. We demonstrate an appearance of additional fractional subharmonic
+steps in the IV-characteristics of $\varphi_{0}$ junction under external
+electromagnetic radiation due to spin-orbit coupling. An origin of subharmonic
+steps is related to the locking of magnetic moment precession to the Josephson
+oscillations. We prove that the positions of those steps follow a continued
+fraction algorithm.",1905.09672v1
+2021-02-25,Stability of highly-twisted Skyrmions from contact topology,"We describe a topological protection mechanism for highly-twisted
+two-dimensional Skyrmions in systems with Dyloshinskii-Moriya (DM) coupling,
+where non-zero DM energy density (dubbed ""twisting energy density"") acts as a
+kind of band gap in real space, yielding an N invariant for highly twisted
+Skyrmions. We prove our result through the application of contact topology by
+extending our system along a fictitious third dimension, and further establish
+the structural stability of highly-twisted Skyrmions under arbitrary
+chirality-preserving distortions. Our results apply for all two-dimensional
+systems hosting Skyrmion excitations including spin-orbit coupled systems
+exhibiting quantum Hall ferromagnetism.",2102.13126v1
+2021-05-13,Electron correlation effects in superconducting nanowires in and out of equilibrium,"One-dimensional nanowires with strong spin-orbit coupling and
+proximity-induced superconductivity are predicted to exhibit topological
+superconductivity with condensed-matter analogues to Majorana fermions. Here,
+the nonequilibrium Green's function approach with the generalized Kadanoff-Baym
+ansatz is employed to study the electron-correlation effects and their role in
+the topological superconducting phase in and out of equilibrium.
+Electron-correlation effects are found to affect the transient signatures
+regarding the zero-energy Majorana states, when the superconducting nanowire is
+subjected to external perturbations such as magnetic-field quenching,
+laser-pulse excitation, and coupling to biased normal-metal leads.",2105.06193v1
+2022-03-27,Quantized and half-quantized Anomalous Hall effect induced by in-plane magnetic field,"In this paper we propose that, quantized and nearly half-quantized intrinsic
+anomalous Hall effect can be induced by in-plane external magnetic field
+through the Zeeman coupling in non-magnetic 2D systems with sizeable
+spin-orbital coupling but without two-fold rotational symmetry. An analytical
+result is derived for 2D electron gas model with $C_{3v}$ symmetry. Based on
+the $\boldsymbol{k\cdot p}$ Hamiltonian derived from first principle
+calculations, we find that quantized and nearly half-quantized conductance can
+be observed in $\mathrm{Sb_2Te_3}$ thin film in the clean limit with strong
+in-plane magnetic field $B>20\ \mathrm{T}$ and low temperature $T<100\
+\mathrm{mK}$.",2203.14301v1
+2024-01-09,Co-doping Er plus V or Er plus Nb into CaWO4,"Er3+ plus V5+, and Er3+ plus Nb5+ co-doped CaWO4, formulas Ca1-xErxW1-xMxO4,
+were synthesized in air by a conventional solid-state method. A color change
+from white to pink was observed in the final products. An equal fraction of
+dopants was employed to obtain charge neutrality, and the limits of the
+solubility for our conditions are lower than x=0.15. The magnetic
+susceptibility data shows that that the magnetic coupling becomes increasingly
+antiferromagnetic with increasing Er3+content. The Curie-Weiss fit and
+isothermal magnetization imply that different degrees of spin-orbit coupling
+appear to be present in the two doping systems. No transitions were observed in
+the heat capacity data above 0.4 K.",2401.04790v1
+2015-10-11,Spin Hall and spin Nernst effects in a two-dimensional electron gas with Rashba spin-orbit interaction: temperature dependence,"Using the Matsubara Green function formalism we calculate the temperature
+dependence of spin Hall and spin Nernst conductivities of a two-dimensional
+electron gas with Rashba spin-orbit interaction in the linear response regime.
+In the case of spin Nernst effect we also include the contribution from
+spin-resolved orbital magnetization, which assures correct behavior of the spin
+Nernst conductivity in the zero-temperature limit. Analytical formulas for the
+spin Hall and spin Nernst conductivities are derived in some specific
+situations. Using the Ioffe-Regel localization criterion, we have also
+estimated the range of parameters where the calculated results for the spin
+Hall and spin Nernst conductivities are applicable. Analytical results show
+that the vertex correction totally suppresses the spin Hall conductivity at
+arbitrary temperature. The spin Nernst conductivity, in turn, vanishes at $T=0$
+when the orbital contribution is taken into account, but generally is nonzero
+at finite temperatures.",1510.03080v2
+2018-08-21,Recent advances in spin-orbit torques: Moving towards device applications,"The ability of spintronic devices to utilize an electric current for
+manipulating the magnetization has resulted in large-scale developments, such
+as, magnetic random access memories and boosted the spintronic research area.
+In this regard, over the last decade, magnetization manipulation using
+spin-orbit torque has been devoted a lot of research attention as it shows a
+great promise for future ultrafast and power efficient magnetic memories. In
+this review, we summarize the latest advancements in spin-orbit torque research
+and highlight some of the technical challenges for practical spin-orbit torque
+devices. We will first introduce the basic concepts and highlight the latest
+material choices for spin-orbit torque devices. Then, we will summarize the
+important advancements in the study of magnetization switching dynamics using
+spin-orbit torque, which are important from scientific as well as technological
+aspect. The final major section focuses on the concept of external assist field
+free spin-orbit torque switching which is a requirement for practical
+spin-orbit torque devices.",1808.06829v1
+2022-11-13,Long-range spin-orbital order in the spin-orbital SU(2)$\times$SU(2)$\times$U(1) model,"By using the tensor-network state algorithm, we study a spin-orbital model
+with SU(2)$\times$SU(2)$\times$U(1) symmetry on the triangular lattice. This
+model was proposed to describe some triangular $d^1$ materials and was argued
+to host a spin-orbital liquid ground state. In our work the trial wavefunction
+of its ground state is approximated by an infinite projected entangled simplex
+state and optimized by the imaginary-time evolution. Contrary to the previous
+conjecture, we find that the two SU(2) symmetries are broken, resulting in a
+stripe spin-orbital order with the same magnitude $m=0.085(10)$. This value is
+about half of that in the spin-1/2 triangular Heisenberg antiferromagnet. Our
+result demonstrates that although the long-sought spin-orbital liquid is absent
+in this model the spin-orbital order is significantly reduced due to the
+enhanced quantum fluctuation. This suggests that high-symmetry spin-orbital
+models are promising in searching for exotic states of matter in
+condensed-matter physics.",2211.06852v1
+2004-12-23,Quasiperiodic spin-orbit motion and spin tunes in storage rings,"We present an in-depth analysis of the concept of spin precession frequency
+for integrable orbital motion in storage rings. Spin motion on the periodic
+closed orbit of a storage ring can be analyzed in terms of the Floquet theorem
+for equations of motion with periodic parameters and a spin precession
+frequency emerges in a Floquet exponent as an additional frequency of the
+system. To define a spin precession frequency on nonperiodic synchro-betatron
+orbits we exploit the important concept of quasiperiodicity. This allows a
+generalization of the Floquet theorem so that a spin precession frequency can
+be defined in this case too. This frequency appears in a Floquet-like exponent
+as an additional frequency in the system in analogy with the case of motion on
+the closed orbit. These circumstances lead naturally to the definition of the
+uniform precession rate and a definition of spin tune. A spin tune is a uniform
+precession rate obtained when certain conditions are fulfilled. Having defined
+spin tune we define spin-orbit resonance on synchro--betatron orbits and
+examine its consequences. We give conditions for the existence of uniform
+precession rates and spin tunes (e.g. where small divisors are controlled by
+applying a Diophantine condition) and illustrate the various aspects of our
+description with several examples. The formalism also suggests the use of
+spectral analysis to ``measure'' spin tune during computer simulations of spin
+motion on synchro-betatron orbits.",0412157v1
+2020-08-19,Prediction of low-Z collinear and noncollinear antiferromagnetic compounds having momentum-dependent spin splitting even without spin-orbit coupling,"Recent study (Yuan et. al., Phys. Rev. B 102, 014422 (2020)) revealed a
+SOC-independent spin splitting and spin polarization effect induced by
+antiferromagnetic ordering which do not necessarily require breaking of
+inversion symmetry or the presence of SOC, hence can exist even in
+centrosymmetric, low-Z light element compounds, considerably broadening the
+material base for spin polarization. In the present work we develop the
+magnetic symmetry conditions enabling such effect, dividing the 1651 magnetic
+space groups into 7 different spin splitting prototypes (SST-1 to SST-7). We
+use the 'Inverse Design' approach of first formulating the target property
+(here, spin splitting in low-Z compounds not restricted to low symmetry
+structures), then derive the enabling physical design principles to search
+realizable compounds that satisfy these a priori design principles. This
+process uncovers 422 magnetic space groups (160 centrosymmetric and 262
+non-centrosymmetric) that could hold AFM-induced, SOC-independent spin
+splitting and spin polarization. We then search for stable compounds following
+such enabling symmetries. We investigate the electronic and spin structures of
+some selected prototype compounds by density functional theory (DFT) and find
+spin textures that are different than the traditional Rashba-Dresselhaus
+patterns. We provide the DFT results for all antiferromagnetic spin splitting
+prototypes (SST-1 to SST-4) and concentrate on revealing of the AFM-induced
+spin splitting prototype (SST-4). The symmetry design principles along with
+their transformation into an Inverse Design material search approach and DFT
+verification could open the way to their experimental examination.M). The
+symmetry design principles along with their transformation into an Inverse
+Design material search approach and DFT verification could open the way to
+their experimental examination.",2008.08532v1
+2011-03-11,Spin-orbital resonating valence bond liquid on a triangular lattice: Evidence from finite-cluster diagonalization,"We investigate the ground state of the $d^1$ spin-orbital model for triply
+degenerate $t_{2g}$ orbitals on a triangular lattice which unifies intrinsic
+frustration of spin and orbital interactions with geometrical frustration.
+Using full or Lanczos exact diagonalization of finite clusters we establish
+that the ground state of the spin-orbital model which interpolates between the
+superexchange and direct exchange interactions on the bonds is characterized by
+valence-bond correlations. In the absence of Hund's exchange the model
+describes a competition between various possible valence-bond states. By
+considering the clusters with open boundary conditions we demonstrate that
+orbital interactions are always frustrated, but this frustration is removed by
+pronounced spin singlet correlations which coexist with supporting them dimer
+orbital correlations. Such local configurations contribute to the disordered
+ground states found for the clusters with periodic boundary conditions which
+interpolate between a highly resonating, dimer-based, entangled spin-orbital
+liquid phase, and a valence-bond state with completely static spin-singlet
+states. We argue that these states are also realized for the infinite lattice
+and anticipate that pronounced transitions between different regimes found for
+particular geometries will turn out to smooth crossovers in the properties of
+the spin-orbital liquid in the thermodynamic limit. Finally, we provide
+evidence that the resonating spin-orbital liquid phase involves entangled
+states on the bonds. In such a phase classical considerations based on the
+mean-field theory cannot be used, spin exchange interactions do not determine
+spin bond correlations, and quantum fluctuations play a crucial role in the
+ground states and magnetic transitions.",1103.2319v1
+2014-11-03,Strain dependence of antiferromagnetic interface coupling in La0.7Sr0.3MnO3/SrRuO3 superlattices,"We have investigated the magnetic response of La0.7Sr0.3MnO3/SrRuO3
+superlattices to biaxial in-plane strain applied in-situ. Superlattices grown
+on piezoelectric substrates of 0.72PbMg1/3Nb2/3O3-0.28PbTiO3(001) (PMN-PT) show
+strong antiferromagnetic coupling of the two ferromagnetic components. The
+coupling field of mu0HAF = 2.8 T is found to decrease by deltaHAF/delta epsilon
+~ -520 mT %-1 under reversible biaxial strain mu0HAF at 80 K in a
+[La0.7Sr0.3MnO3(22)/SrRuO3(55)]15 superlattice. This reveals a significant
+strain effect on interfacial coupling. The applied in-plane compression
+enhances the ferromagnetic order in the manganite layers which are under
+as-grown tensile strain. It is thus difficult to disentangle the contributions
+from strain-dependent antiferromagnetic Mn-O-Ru interface coupling and Mn-O-Mn
+ferromagnetic double exchange near the interface, since the enhanced magnetic
+order of Mn spins leads to a larger net coupling of SrRuO3 layers at the
+interface. Strain-dependent orbital occupation in a single-ion picture cannot
+explain the sign of the observed strain dependence, whereas the enhanced Mn
+order at the interface is qualitatively in line with it.",1411.0411v2
+2016-06-24,Two-dimensional electron gas in the regime of strong light-matter coupling: Dynamical conductivity and all-optical measurements of Rashba and Dresselhaus coupling,"A nonperturbative interaction of an electronic system with a laser field can
+substantially modify its physical properties. In particular, in two-dimensional
+(2D) materials with a lack of inversion symmetry, the achievement of a regime
+of strong light-matter coupling allows direct optical tuning of the strength of
+the Rashba spin-orbit interaction (SOI). Capitalizing on these results, we
+build a theory of the dynamical conductivity of a 2D electron gas with both
+Rashba and Dresselhaus SOIs coupled to an off-resonant high-frequency
+electromagnetic wave. We argue that strong light-matter coupling modifies
+qualitatively the dispersion of the electrons and can be used as a powerful
+tool to probe and manipulate the coupling strengths and adjust the frequency
+range where optical conductivity is essentially nonzero.",1606.07663v2
+2020-05-27,Rydberg spectrum of a single trapped Ca$^+$ ion: A Floquet analysis,"We compute the Rydberg spectrum of a single Ca$^+$ ion in a Paul trap by
+incorporating various internal and external coupling terms of the ion to the
+trap in the Hamiltonian. The coupling terms include spin-orbit coupling in
+Ca$^+$, charge (electron and ionic core) coupling to the radio frequency and
+static fields, ion-electron coupling in the Paul trap, and ion center-of-mass
+coupling. The electronic Rydberg states are precisely described by a
+one-electron model potential for e$^-$+Ca$^{2+}$, and accurate eigenenergies,
+quantum defect parameters, and static and tensor polarizabilities for a number
+of excited Rydberg states are obtained. The time-periodic rf Hamiltonian is
+expanded in the Floquet basis, and the trapping-field-broadened Rydberg lines
+are compared with recent observations of Ca$^+(23P)$ and Ca$^+(52F)$ Rydberg
+lines.",2005.13659v1
+2016-03-11,Proximity effect and Majorana bound states in clean semiconductor nanowires coupled to disordered superconductors,"We study a semiconductor wire with strong spin-orbit coupling, which is
+proximity-coupled to a superconductor with chemical potential disorder. When
+tunneling at the semiconductor- superconductor interface is very weak, it is
+known that disorder in the superconductor does not affect the induced
+superconductivity nor, therefore, the effective topological superconductivity
+that emerges above a critical magnetic field. We demonstrate nonperturbatively
+how this result breaks down with stronger proximity coupling by obtaining the
+low-energy (i.e., subgap) excitation spectrum through direct numerical
+diagonalization of an appropriate BdG hamiltonian. With strong proximity
+coupling, we find that disorder in the parent superconductor suppresses the
+(non- topological) induced gap at zero magnetic field by disordering the
+induced pair potential. In the topological superconducting phase at large
+magnetic field, strong proximity coupling reduces the localization length of
+Majorana bound states, such that the induced disorder eliminates the
+topological gap while bulk Majorana zero modes emerge, even for short wires.",1603.03780v1
+2023-03-28,Analysis of ultrafast magnetization switching dynamics in exchange-coupled ferromagnet-ferrimagnet heterostructures,"Magnetization switching in ferromagnets has so far been limited to the
+current-induced spin-orbit-torque effects. Recent observation of
+helicity-independent all-optical magnetization switching in exchange-coupled
+ferromagnet ferrimagnet heterostructures expanded the range and applicability
+of such ultrafast heat-driven magnetization switching. Here we report the
+element-resolved switching dynamics of such an exchange-coupled system, using a
+modified microscopic three-temperature model. We have studied the effect of i)
+the Curie temperature of the ferromagnet, ii) ferrimagnet composition, iii) the
+long-range RKKY exchange-coupling strength, and iv) the absorbed optical energy
+on the element-specific time-resolved magnetization dynamics. The phase-space
+of magnetization illustrates how the RKKY coupling strength and the absorbed
+optical energy influence the switching time. Our analysis demonstrates that the
+threshold switching energy depends on the composition of the ferrimagnet and
+the switching time depends on the Curie temperature of the ferromagnet as well
+as RKKY coupling strength. This simulation anticipates new insights into
+developing faster and more energy-efficient spintronics devices.",2303.16294v1
+2016-09-02,Semiclassical theory of anisotropic transport at LaAlO3/SrTiO3 interfaces under in-plane magnetic field,"The unconventional magnetotransport at the interface between transition-metal
+oxides $LaAlO_3$ (LAO) and $SrTiO_3$ (STO) is frequently related to mobile
+electrons interacting with localized magnetic moments. However nature and
+properties of magnetism at this interface are not well understood so far. In
+this paper, we focus on transport effects driven by spin-orbit coupling and
+intentionally neglect possible strong correlations. The electrical resistivity
+tensor is calculated as a function of the magnitude and orientation of an
+external magnetic field parallel to the interface. The semiclassical Boltzmann
+equation is solved numerically for the two-dimensional system of spin-orbit
+coupled electrons accelerated by an electric field and scattered by
+spatially-correlated impurities. At temperatures of a few Kelvin and densities
+such that the chemical potential crosses the second pair of spin-orbit split
+bands, we find a strongly anisotropic modulation of the (negative)
+magnetoresistance above 10 T, characterized by multiple maxima and minima away
+from the crystalline axes. Along with the drop of the magnetoresistance, an
+abrupt enhancement of the transverse resistivity occurs. The angular modulation
+of the latter considerably deviates from a (low-field) sinusoidal dependence to
+a (high-field) step-like behaviour. These peculiar features are the
+consequences of the anisotropy of both (intra-band and inter-band )
+scattering-amplitudes in the Brillouin zone when the relevant energy scales in
+the system - chemical potential, spin-orbit interaction and Zeeman energy - are
+all comparable to each other. The theory provides good qualitative agreement
+with experimental data in the literature.",1609.00663v3
+2019-03-01,Spin-orbit-controlled metal-insulator transition in Sr$_2$IrO$_4$,"In the context of correlated insulators, where electron-electron interactions
+(U) drive the localization of charge carriers, the metal-insulator transition
+(MIT) is described as either bandwidth (BC) or filling (FC) controlled.
+Motivated by the challenge of the insulating phase in Sr$_2$IrO$_4$, a new
+class of correlated insulators has been proposed, in which spin-orbit coupling
+(SOC) is believed to renormalize the bandwidth of the half-filled
+$j_{\mathrm{eff}} = 1/2$ doublet, allowing a modest U to induce a
+charge-localized phase. Although this framework has been tacitly assumed, a
+thorough characterization of the ground state has been elusive. Furthermore,
+direct evidence for the role of SOC in stabilizing the insulating state has not
+been established, since previous attempts at revealing the role of SOC have
+been hindered by concurrently occurring changes to the filling. We overcome
+this challenge by employing multiple substituents that introduce well defined
+changes to the signatures of SOC and carrier concentration in the electronic
+structure, as well as a new methodology that allows us to monitor SOC directly.
+Specifically, we study Sr$_2$Ir$_{1-x}$T$_x$O$_4$ (T = Ru, Rh) by
+angle-resolved photoemission spectroscopy (ARPES), combined with ab-initio and
+supercell tight-binding calculations. This allows us to distinguish
+relativistic and filling effects, thereby establishing conclusively the central
+role of SOC in stabilizing the insulating state of Sr$_2$IrO$_4$. Most
+importantly, we estimate the critical value for spin-orbit coupling in this
+system to be $\lambda_c = 0.42 \pm 0.01$ eV, and provide the first
+demonstration of a spin-orbit-controlled MIT.",1903.00484v2
+2000-09-28,"Andreev-Tunneling, Coulomb Blockade, and Resonant Transport of Non-Local Spin-Entangled Electrons","We propose and analyze a spin-entangler for electrons based on an s-wave
+superconductor coupled to two quantum dots each of which is tunnel-coupled to
+normal Fermi leads. We show that in the presence of a voltage bias and in the
+Coulomb blockade regime two correlated electrons provided by the Andreev
+process can coherently tunnel from the superconductor via different dots into
+different leads. The spin-singlet coming from the Cooper pair remains preserved
+in this process, and the setup provides a source of mobile and nonlocal
+spin-entangled electrons. The transport current is calculated and shown to be
+dominated by a two-particle Breit-Wigner resonance which allows the injection
+of two spin-entangled electrons into different leads at exactly the same
+orbital energy, which is a crucial requirement for the detection of spin
+entanglement via noise measurements. The coherent tunneling of both electrons
+into the same lead is suppressed by the on-site Coulomb repulsion and/or the
+superconducting gap, while the tunneling into different leads is suppressed
+through the initial separation of the tunneling electrons. In the regime of
+interest the particle-hole excitations of the leads are shown to be negligible.
+The Aharonov-Bohm oscillations in the current are shown to contain single- and
+two-electron periods with amplitudes that both vanish with increasing Coulomb
+repulsion albeit differently fast.",0009452v2
+2014-07-22,Theoretical elucidation of possibility of Majorana modes in a two dimensional Dirac system,"Here we present the theoretical clarification of possibility of eight
+Majorana-like modes (quasi-particles which are self-conjugate) close to the
+experimentally inaccessible Dirac points of a two-dimensional monolayer Dirac
+system. The valley-mixing and the spin-degeneracy lifting are the main
+requirements. These are possible by wedging in the requisite ingredients in the
+description, viz. the atomically sharp scatterers and the strong spin-orbit
+coupling (SOC). The latter can possibly be achieved in graphene folding a
+sheet; the higher curvature of deformations correspond to stronger values of
+the coupling. In silicene, the buckled structure of the system generates a
+staggered sub-lattice potential between silicon atoms at A sites and B sites
+for an applied electric field perpendicular to its plane. The stronger SOC in
+silicene has its origin also in the buckled structure of the system. Tuning of
+electric field, allows for rich behavior varying from a topological insulator
+to a normal insulator with a valley spin-polarized metal (VSPM) at a critical
+value in between. The VSPM stage is characterized by the valley-spin locking,
+i.e. the opposite spin polarization at different valleys. We shall see that in
+this phase, if the inter-valley scattering process and the real spin-flip
+process in moderation are allowed to take place, we have the right condition
+for capturing Majoranas in the proximity of a s-wave superconductor.",1407.5938v1
+2015-02-26,"Strong Interplay between Stripe Spin Fluctuations, Nematicity and Superconductivity in FeSe","Elucidating the microscopic origin of nematic order in iron-based
+superconducting materials is important because the interactions that drive
+nematic order may also mediate the Cooper pairing. Nematic order breaks
+fourfold rotational symmetry in the iron plane, which is believed to be driven
+by either orbital or spin degrees of freedom. However, as the nematic phase
+often develops at a temperature just above or coincides with a stripe magnetic
+phase transition, experimentally determining the dominant driving force of
+nematic order is difficult. Here, we use neutron scattering to study
+structurally the simplest iron-based superconductor FeSe, which displays a
+nematic (orthorhombic) phase transition at $T_s=90$ K, but does not order
+antiferromagnetically. Our data reveal substantial stripe spin fluctuations,
+which are coupled with orthorhombicity and are enhanced abruptly on cooling to
+below $T_s$. Moreover, a sharp spin resonance develops in the superconducting
+state, whose energy (~4 meV) is consistent with an electron boson coupling mode
+revealed by scanning tunneling spectroscopy, thereby suggesting a spin
+fluctuation-mediated sign-changing pairing symmetry. By normalizing the dynamic
+susceptibility into absolute units, we show that the magnetic spectral weight
+in FeSe is comparable to that of the iron arsenides. Our findings support
+recent theoretical proposals that both nematicity and superconductivity are
+driven by spin fluctuations.",1502.07544v1
+2016-09-01,Topical Review: Spins and mechanics in diamond,"There has been rapidly growing interest in hybrid quantum devices involving a
+solid-state spin and a macroscopic mechanical oscillator. Such hybrid devices
+create exciting opportunities to mediate interactions between disparate qubits
+and to explore the quantum regime of macroscopic mechanical objects. In
+particular, a system consisting of the nitrogen-vacancy defect center in
+diamond coupled to a high quality factor mechanical oscillator is an appealing
+candidate for such a hybrid quantum device, as it utilizes the highly coherent
+and versatile spin properties of the defect center. In this paper, we will
+review recent experimental progress on diamond-based hybrid quantum devices in
+which the spin and orbital dynamics of single defects are driven by the motion
+of a mechanical oscillator. In addition, we discuss prospective applications
+for this device, including long range, phonon-mediated spin-spin interactions,
+and phonon cooling in the quantum regime. We conclude the review by evaluating
+the experimental limitations of current devices and identifying alternative
+device architectures that may reach the strong coupling regime.",1609.00418v2
+2016-08-16,Revealing frustrated local moment model for pressurized hyperhoneycomb iridate: paving a way toward quantum spin liquid,"There have been tremendous experimental and theoretical efforts toward
+discovery of quantum spin liquid phase in honeycomb-based-lattice materials
+with strong spin-orbit coupling. Here the bond-dependent Kitaev interaction
+between local moments provides strong magnetic frustration and if it is the
+only interaction present in the system, it will lead to an exactly solvable
+quantum spin liquid ground state. In all of these materials, however, the
+ground state is in a magnetically ordered phase due to additional interactions
+between local moments. Recently, it has been reported that the magnetic order
+in hyperhoneycomb material, $\beta$-Li$_2$IrO$_3$, is suppressed upon applying
+hydrostatic pressure and the resulting state becomes a quantum paramagnet or
+possibly a quantum spin liquid. Using ab-initio computations and strong
+coupling expansion, we investigate the lattice structure and resulting local
+moment model in pressurized $\beta$-Li$_2$IrO$_3$. Remarkably, the dominant
+interaction under high pressure is not the Kitaev interaction nor further
+neighbor interactions, but a different kind of bond-dependent interaction. This
+leads to strong magnetic frustration and may provide a platform for discovery
+of a new kind of quantum spin liquid ground state.",1608.04741v2
+2020-08-13,Magnetization Dynamics of Nanoscale Magnetic Materials: A Perspective,"Nanomagnets form the building blocks for a gamut of miniaturized
+energy-efficient devices including data storage, memory, wave-based computing,
+sensors and biomedical devices. They also offer a span of exotic phenomena and
+stern challenges. The progress in the magnetization dynamics of single
+nanomagnets and one- and two-dimensional arrays of nanostructures in the form
+of dots, antidots, nanoparticles, binary and bicomponent structures and
+patterned multilayers have been presented. Progress in unconventional and new
+structures like artificial spin ice and three-dimensional nanomagnets and spin
+textures like domain walls, vortex and skyrmions have been presented.
+Furthermore, a huge variety of new topics in the magnetization dynamics of
+magnetic nanostructures are rapidly emerging. An overview of the steadily
+evolving topics like spatio-temporal imaging of fast dynamics of
+nanostructures, dynamics of spin textures, artificial spin ice have been
+discussed. In addition, dynamics of contemporary and newly transpired magnetic
+architectures such as nanomagnet arrays with complex basis and symmetry,
+magnonic quasicrystals, fractals, defect structures, novel three-dimensional
+structures have been introduced. Effects of various spin-orbit coupling and
+ensuing spin textures as well as quantum hybrid systems comprising of
+magnon-photon, magnon-phonon and magnon-magnon coupling, antiferromagnetic
+nanostructures are rapidly growing and are expected to dominate this research
+field in the coming years. Finally, associated topics like nutation dynamics
+and nanomagnet antenna are briefly discussed. Despite showing a great progress,
+only a small fraction of nanomagnetism and its ancillary topics have been
+explored so far and huge efforts are envisaged in this evergrowing research
+area in the generations to come.",2008.05819v1
+2020-10-19,Geometrical Hall effect and momentum-space Berry curvature from spin-reversed band pairs,"When nanometric, noncoplanar spin textures with scalar spin chirality (SSC)
+are coupled to itinerant electrons, they endow the quasiparticle wavefunctions
+with a gauge field, termed Berry curvature, in a way that bears analogy to
+relativistic spin-orbit coupling (SOC). The resulting deflection of moving
+charge carriers is termed geometrical (or topological) Hall effect. Previous
+experimental studies modeled this signal as a real-space motion of wavepackets
+under the influence of a quantum-mechanical phase. In contrast, we here compare
+the modification of Bloch waves themselves, and of their energy dispersion, due
+to SOC and SSC. Using the canted pyrochlore ferromagnet Nd$_2$Mo$_2$O$_7$ as a
+model compound, our transport experiments and first-principle calculations show
+that SOC impartially mixes electronic bands with equal or opposite spin, while
+SSC is much more effective for opposite spin band pairs.",2010.09537v4
+2019-05-23,Efficient variational approach to dynamics of a spatially extended bosonic Kondo model,"We develop an efficient variational approach to studying dynamics of a
+localized quantum spin coupled to a bath of mobile spinful bosons. We use
+parity symmetry to decouple the impurity spin from the environment via a
+canonical transformation and reduce the problem to a model of the interacting
+bosonic bath. We describe coherent time evolution of the latter using bosonic
+Gaussian states as a variational ansatz. We provide full analytical expressions
+for equations describing variational time evolution that can be applied to
+study in- and out-of-equilibrium phenomena in a wide class of quantum impurity
+problems. In the accompanying paper [Y. Ashida {\it et al.}, Phys. Rev. Lett.
+123, 183001 (2019)], we present a concrete application of this general
+formalism to the analysis of the Rydberg Central Spin Model, in which the
+spin-1/2 Rydberg impurity undergoes spin-changing collisions in a dense cloud
+of two-component ultracold bosons. To illustrate new features arising from
+orbital motion of the bath atoms, we compare our results to the Monte Carlo
+study of the model with spatially localized bosons in the bath, in which random
+positions of the atoms give rise to random couplings of the standard central
+spin model.",1905.09615v5
+2022-08-23,Microwave spectroscopy of interacting Andreev spins,"Andreev bound states are fermionic states localized in weak links between
+superconductors which can be occupied with spinful quasiparticles. Microwave
+experiments using superconducting circuits with InAs/Al nanowire Josephson
+junctions have recently enabled probing and coherent manipulation of Andreev
+states but have remained limited to zero or small fields. Here we use a
+flux-tunable superconducting circuit in external magnetic fields up to 1T to
+perform spectroscopy of spin-polarized Andreev states up to ~250 mT, beyond
+which the spectrum becomes gapless. We identify singlet and triplet states of
+two quasiparticles occupying different Andreev states through their dispersion
+in magnetic field. These states are split by exchange interaction and couple
+via spin-orbit coupling, analogously to two-electron states in quantum dots. We
+also show that the magnetic field allows to drive a direct spin-flip transition
+of a single quasiparticle trapped in the junction. Finally, we measure a gate-
+and field-dependent anomalous phase shift of the Andreev spectrum, of magnitude
+up to approximately $0.7\pi$. Our observations demonstrate new ways to
+manipulate Andreev states in a magnetic field and reveal spin-polarized triplet
+states that carry supercurrent.",2208.11198v1
+2022-11-21,General time-reversal equivariant neural network potential for magnetic materials,"This study introduces time-reversal E(3)-equivariant neural network and
+SpinGNN++ framework for constructing a comprehensive interatomic potential for
+magnetic systems, encompassing spin-orbit coupling and noncollinear magnetic
+moments. SpinGNN++ integrates multitask spin equivariant neural network with
+explicit spin-lattice terms, including Heisenberg, Dzyaloshinskii-Moriya,
+Kitaev, single-ion anisotropy, and biquadratic interactions, and employs
+time-reversal equivariant neural network to learn high-order spin-lattice
+interactions using time-reversal E(3)-equivariant convolutions. To validate
+SpinGNN++, a complex magnetic model dataset is introduced as a benchmark and
+employed to demonstrate its capabilities. SpinGNN++ provides accurate
+descriptions of the complex spin-lattice coupling in monolayer CrI$_3$ and
+CrTe$_2$, achieving sub-meV errors. Importantly, it facilitates large-scale
+parallel spin-lattice dynamics, thereby enabling the exploration of associated
+properties, including the magnetic ground state and phase transition.
+Remarkably, SpinGNN++ identifies a new ferrimagnetic state as the ground
+magnetic state for monolayer CrTe2, thereby enriching its phase diagram and
+providing deeper insights into the distinct magnetic signals observed in
+various experiments.",2211.11403v3
+2024-03-31,Charge and spin current pumping by ultrafast demagnetization dynamics,"The surprising discovery of ultrafast demagnetization -- where electric field
+of femtosecond laser pulse couples to electrons of a ferromagnetic (FM) layer
+causing its magnetization vector {\em to shrink while not rotating}, is also
+assumed to be accompanied by generation of spin current in the direction
+orthogonal to electric field. However, understanding of the microscopic origin
+of such spin current and how efficiently it can be converted into charge
+current, as the putative source of THz radiation, is lacking despite nearly
+three decades of intense studies. Here we connect the standard pumping
+phenomena driven by microwave precession of magnetization vector replacing
+periodic time-dependence of magnetization precession with nonperiodic
+time-dependence of demagnetization, as obtained from experiments on
+ultrafast-light-driven Ni layer. Applying time-dependent nonequilibrium Green's
+functions, able to evolve such setup with arbitrary time dependence, reveals
+how demagnetization dynamics pumps both charge and spin currents in directions
+both parallel and orthogonal to electric field of laser pulse, even in the
+absence of spin-orbit coupling and thereby induced spin-to-charge conversion
+mechanisms. Although pumped currents follow $dM_z/dt$ in some setups, this
+becomes obscured when NM layers are disconnected and pumped currents start to
+reflect from FM boundaries (as is the case of experimental setups). Finally, we
+use the Jefimenko equations to compute electromagnetic radiation by charge
+current pumped in disconnected setup during demagnetization, or later during
+its slow recovery, unraveling that radiated electric field only in the former
+time interval exhibits features in 0.1--30 THz frequency range probed
+experimentally or explored for applications of spintronic THz emitters.",2404.00779v1
+2013-12-29,The spin-orbit resonances of the Solar system: A mathematical treatment matching physical data,"In the mathematical framework of a restricted, slightly dissipative
+spin-orbit model, we prove the existence of periodic orbits for astronomical
+parameter values corresponding to all satellites of the Solar system observed
+in exact spin-orbit resonance.",1312.7544v1
+2021-10-27,The Rossiter-McLaughlin effect Revolutions: An ultra-short period planet and a warm mini-Neptune on perpendicular orbits,"Comparisons of the alignment of exoplanets with a common host star can be
+used to distinguish among concurrent evolution scenarios. However, multi-planet
+systems usually host mini-Neptunes and super-Earths, whose size make orbital
+architecture measurements challenging. We introduce the Rossiter-McLaughlin
+effect Revolutions technique, which can access spin-orbit angles of small
+planets by exploiting the full information contained in spectral transit time
+series. We validated the technique on published HARPS-N data of the
+mini-Neptune HD3167c, refining its high sky-projected spin-orbit angle
+(-108.9+5.4-5.5 deg), and we applied it to new ESPRESSO observations of the
+super-Earth HD3167b, revealing an aligned orbit (-6.6+6.6-7.9 deg).
+Surprisingly different variations in the contrast of the stellar lines occulted
+by the planets can be reconciled with a latitudinal dependence of the stellar
+line shape. In this scenario, a joint fit to both datasets constrains the
+inclination of the star (111.6+3.1-3.3 deg) and the 3D spin-orbit angles of
+HD3167b (29.5+7.2-9.4 deg) and HD3167c (107.7+5.1-4.9 deg). The projected
+spin-orbit angles do not depend on the model for the line contrast variations,
+and so, with a mutual inclination of 102.3+7.4-8.0 deg, we conclude that the
+two planets are on perpendicular orbits. This could be explained by HD3167b
+being strongly coupled to the star and retaining its primordial alignment,
+whereas HD3167c would have been brought to a nearly polar orbit via secular
+gravitational interactions with an outer companion. Follow-up observations and
+dynamical evolution simulations are required to search for this companion and
+explore this scenario. HD3167b is the smallest exoplanet with a confirmed
+spectroscopic Rossiter-McLaughlin signal. Our new technique opens the way to
+determining the orbital architectures of the super-Earth and Earth-sized planet
+populations.",2110.14214v1
+2001-07-23,"Electronic structure study of double perovskites $A_{2}$FeReO$_{6}$ (A=Ba,Sr,Ca) and Sr$_{2}M$MoO$_{6}$ (M=Cr,Mn,Fe,Co) by LSDA and LSDA+U","We have implemented a systematic LSDA and LSDA+U study of the double
+perovskites $A_{2}$FeReO$_{6}$ (A=Ba,Sr,Ca) and Sr$_{2}$$M$MoO$_{6}$
+(M=Cr,Mn,Fe,Co) for understanding of their intriguing electronic and magnetic
+properties. The results suggest a ferrimagnetic (FiM) and half-metallic (HM)
+state of $A_{2}$FeReO$_{6}$ (A=Ba,Sr) due to a pdd-$\pi$ coupling between the
+down-spin Re$^{5+}$/Fe$^{3+}$ $t_{2g}$ orbitals via the intermediate O
+$2p_{\pi}$ ones, also a very similar FiM and HM state of Sr$_{2}$FeMoO$_{6}$.
+In contrast, a decreasing Fe $t_{2g}$ component at Fermi level ($E_{F}$) in the
+distorted Ca$_{2}$FeReO$_{6}$ partly accounts for its nonmetallic behavior,
+while a finite $pdd$-$\sigma$ coupling between the down-spin
+Re$^{5+}$/Fe$^{3+}$ $e_{g}$ orbitals being present at $E_{F}$ serves to
+stabilize its FiM state. For Sr$_{2}$CrMoO$_{6}$ compared with
+Sr$_{2}$FeMoO$_{6}$, the coupling between the down-spin Mo$^{5+}$/Cr$^{3+}$
+$t_{2g}$ orbitals decreases as a noticeable shift up of the Cr$^{3+}$ 3d
+levels, which is likely responsible for the decreasing $T_{C}$ value and weak
+conductivity. Moreover, the calculated level distributions indicate a
+Mn$^{2+}$(Co$^{2+}$)/Mo$^{6+}$ ionic state in Sr$_{2}$MnMoO$_{6}$
+(Sr$_{2}$CoMoO$_{6}$), in terms of which their antiferromagnetic insulating
+ground state can be interpreted. While orbital population analyses show that
+owing to strong intrinsic pd covalence effects, Sr$_{2}M$MoO$_{6}$
+(M=Cr,Mn,Fe,Co) have nearly the same valence state combinations, as accounts
+for the similar M-independent spectral features observed in them.",0107462v1
+2020-09-25,Strain-engineering of the charge and spin-orbital interactions in Sr2IrO4,"In the high spin-orbit coupled Sr2IrO4, the high sensitivity of the ground
+state to the details of the local lattice structure shows a large potential for
+the manipulation of the functional properties by inducing local lattice
+distortions. We use epitaxial strain to modify the Ir-O bond geometry in
+Sr2IrO4 and perform momentum-dependent Resonant Inelastic X-ray Scattering
+(RIXS) at the metal and at the ligand sites to unveil the response of the low
+energy elementary excitations. We observe that the pseudospin-wave dispersion
+for tensile-strained Sr2IrO4 films displays large softening along the [h,0]
+direction, while along the [h,h] direction it shows hardening. This evolution
+reveals a renormalization of the magnetic interactions caused by a
+strain-driven crossover from anisotropic to isotropic interactions between the
+magnetic moments. Moreover, we detect dispersive electron-hole pair excitations
+which shift to lower (higher) energies upon compressive (tensile) strain,
+manifesting a reduction (increase) in the size of the charge gap. This behavior
+shows an intimate coupling between charge excitations and lattice distortions
+in Sr2IrO4, originating from the modified hopping elements between the t2g
+orbitals. Our work highlights the central role played by the lattice degrees of
+freedom in determining both the pseudospin and charge excitations of Sr2IrO4
+and provides valuable information towards the control of the ground state of
+complex oxides in the presence of high spin-orbit coupling.",2009.12262v1
+2023-09-17,Relativistic Douglas-Kroll-Hess Calculations of Hyperfine Interactions within First Principles Multireference Methods,"Relativistic magnetic hyperfine interaction Hamiltonian based on the
+Douglas-Kroll-Hess (DKH) theory up to the second order is implemented within
+the ab initio multireference methods including spin-orbit coupling in the
+Molcas/OpenMolcas package. This implementation is applied to calculate
+relativistic hyperfine coupling (HFC) parameters for atomic systems and
+diatomic radicals with valence s or d orbitals by systematically varying active
+space size in the restricted active space self-consistent field (RASSCF)
+formalism with restricted active space state interaction (RASSI) for spin-orbit
+coupling. The DKH relativistic treatment of the hyperfine interaction reduces
+the Fermi contact contribution to the HFC due to the presence of kinetic
+factors that regularize the singularity of the Dirac delta function in the
+nonrelativitic Fermi contact operator. This effect is more prominent for
+heavier nuclei. As the active space size increases, the relativistic correction
+of the Fermi contact contribution converges well to the experimental data for
+light and moderately heavy nuclei. The relativistic correction, however, does
+not significantly affect the spin-dipole contribution to the hyperfine
+interaction. In addition to the atomic and molecular systems, the
+implementation is applied to calculate the relativistic HFC parameters for
+large trivalent and divalent Tb-based single-molecule magnets (SMMs) such as
+Tb(III)Pc$_2$ and Tb(II)(Cp$^\text{iPr5}$)$_2$ without ligand truncation using
+well-converged basis sets. In particular, for the divalent SMM which has an
+unpaired valence 6s/5d hybrid orbital, the relativistic treatment of HFC is
+crucial for a proper description of the Fermi contact contribution. Even with
+the relativistic hyperfine Hamiltonian, the divalent SMM is shown to exhibit
+strong tunability of HFC via an external electric field (i.e., strong hyperfine
+Stark effect).",2309.09349v1
+2012-04-26,"Linear bands, zero-momentum Weyl semimetal, and topological transition in skutterudite-structure pnictides","It was reported earlier [Phys. Rev. Lett. 106, 056401 (2011)] that the
+skutterudite structure compound CoSb$_3$ displays a unique band structure with
+a topological transition versus a symmetry-preserving sublattice (Sb)
+displacement very near the structural ground state. The transition is through a
+massless Dirac-Weyl semimetal, point Fermi surface phase which is unique in
+that (1) it appears in a three dimensional crystal, (2) the band critical point
+occurs at $k$=0, and (3) linear bands are degenerate with conventional
+(massive) bands at the critical point (before inclusion of spin-orbit
+coupling). Further interest arises because the critical point separates a
+conventional (trivial) phase from a topological phase. In the native cubic
+structure this is a zero-gap topological semimetal; we show how spin-orbit
+coupling and uniaxial strain converts the system to a topological insulator
+(TI). We also analyze the origin of the linear band in this class of materials,
+which is the characteristic that makes them potentially useful in
+thermoelectric applications or possibly as transparent conductors. We
+characterize the formal charge as Co$^{+}$ $d^8$, consistent with the gap, with
+its $\bar{3}$ site symmetry, and with its lack of moment. The Sb states are
+characterized as $p_x$ (separately, $p_y$) $\sigma$-bonded $Sb_4$ ring states
+occupied and the corresponding antibonding states empty. The remaining
+(locally) $p_z$ orbitals form molecular orbitals with definite parity centered
+on the empty $2a$ site in the skutterudite structure. Eight such orbitals must
+be occupied; the one giving the linear band is an odd orbital singlet $A_{2u}$
+at the zone center. We observe that the provocative linearity of the band
+within the gap is a consequence of the aforementioned near-degeneracy, which is
+also responsible for the small band gap.",1204.5905v1
+2024-03-27,Analytical computation of bifurcation of orbits near collinear libration point in the restricted three-body problem,"A unified analytical solution is presented for constructing the phase space
+near collinear libration points in the Circular Restricted Three-body Problem
+(CRTBP), encompassing Lissajous orbits and quasihalo orbits, their invariant
+manifolds, as well as transit and non-transit orbits. Traditional methods could
+only derive separate analytical solutions for the invariant manifolds of
+Lissajous orbits and halo orbits, falling short for the invariant manifolds of
+quasihalo orbits. By introducing a coupling coefficient {\eta} and a
+bifurcation equation, a unified series solution for these orbits is
+systematically developed using a coupling-induced bifurcation mechanism and
+Lindstedt-Poincar\'e method. Analyzing the third-order bifurcation equation
+reveals bifurcation conditions for halo orbits, quasihalo orbits, and their
+invariant manifolds. Furthermore, new families of periodic orbits similar to
+halo orbits are discovered, and non-periodic/quasi-periodic orbits, such as
+transit orbits and non-transit orbits, are found to undergo bifurcations. When
+{\eta} = 0, the series solution describes Lissajous orbits and their invariant
+manifolds, transit, and non-transit orbits. As {\eta} varies from zero to
+non-zero values, the solution seamlessly transitions to describe quasihalo
+orbits and their invariant manifolds, as well as newly bifurcated transit and
+non-transit orbits. This unified analytical framework provides a more
+comprehensive understanding of the complex phase space structures near
+collinear libration points in the CRTBP.",2403.18237v1
+1993-09-13,Persistent Currents in Mesoscopic Hubbard Rings with Spin-Orbit Interaction,"The effect of spin-orbit interaction on persistent currents in mesoscopic
+Hubbard rings threaded by an Aharonov-Bohm flux is investigated putting stress
+on the orbital magnetism. The non-perturbative treatment of the spin-orbit
+interaction developed by Meir {\em et al.} is combined with the Bethe ansatz
+solution to deal with this problem exactly. We find that the interplay of
+spin-orbit interaction and electron-electron interaction plays a crucial role,
+bringing about some new effects on the orbital magnetism.",9309012v1
+1997-10-08,Spin and orbital excitation spectrum in the Kugel-Khomskii model,"We discuss spin and orbital ordering in the twofold orbital degenerate
+superexchange model in three dimensions relevant to perovskite transition metal
+oxides. We focus on the particular point on the classical phase diagram where
+orbital degeneracy is lifted by quantum effects exclusively. Dispersion and
+damping of the spin and orbital excitations are calculated at this point taking
+into account their mutual interaction. Interaction corrections to the
+mean-field order parameters are found to be small. We conclude that
+quasi-one-dimensional Neel spin order accompanied by the uniform
+d_{3z^2-r^2}-type orbital ordering is stable against quantum fluctuations.",9710070v1
+1999-08-31,Linear spin and orbital wave theory for undoped manganites,"We present a linear spin and orbital wave theory to account for the spin and
+orbital orderings observed experimentally in undoped manganite. It is found
+that the anisotropy of the magnetic structure is closely related to the orbital
+ordering, and the Jahn-Teller effect stabilizes the orbital ordering. The phase
+diagram and the low energy excitation spectra for both spin and orbital
+orderings are obtained. The calculated critical temperatures can be
+quantitatively comparable to the experimental data.",9908464v1
+2004-10-01,Suppression of Spin Frustration due to Orbital Selection,"In order to clarify a crucial role of orbital degree of freedom in
+geometrically frustrated systems, we investigate both ground- and excited-state
+properties of the e_g-orbital degenerate Hubbard model on two kinds of
+lattices, ladder and zigzag chain, by using numerical techniques. In the
+ladder, spin correlation extends on the whole system, while the zigzag chain is
+decoupled to a double chain and spin excitation is confined in one side of the
+double chain due to the selection of a specific orbital. We envision a kind of
+self-organization phenomenon that the geometrically frustrated multi-orbital
+system is spontaneously reduced to a one-orbital model to suppress the spin
+frustration.",0410023v1
+2011-10-24,Spin-orbital Kondo effect in a parallel double quantum dot,"Transport properties of the two-orbital Kondo effect involving both spin and
+orbital (pseudospin) degrees of freedom were examined in a parallel double
+quantum dot with a sufficient interdot Coulomb interaction and negligibly small
+interdot tunneling. The Kondo effect was observed at the interdot Coulomb
+blockade region with degeneracies of both spin and orbital degrees of freedom.
+When the orbital degeneracy is lifted by applying a finite detuning, the Kondo
+resonance exhibits a triple-peak structure, indicating that both spin and
+orbital contributions are involved.",1110.5130v1
+2017-06-07,Topological Phases emerging from Spin-Orbital Physics,"We study the evolution of spin-orbital correlations in an inhomogeneous
+quantum system with an impurity replacing a doublon by a holon orbital degree
+of freedom. Spin-orbital entanglement is large when spin correlations are
+antiferromagnetic, while for a ferromagnetic host we obtain a pure orbital
+description. In this regime the orbital model can be mapped on spinless
+fermions and we uncover topological phases with zero energy modes at the edge
+or at the domain between magnetically inequivalent regions.",1706.02140v1
+2023-02-13,Perturbation Theory Treatment of Spin-Orbit Coupling. III: Coupled Perturbed Method for Solids,"A previously proposed non-canonical coupled-perturbed Kohn-Sham density
+functional theory (KS-DFT)/Hartree-Fock (HF) treatment for spin-orbit coupling
+is here generalized to infinite periodic systems. The scalar-relativistic
+periodic KS-DFT/HF solution, obtained with a relativistic effective core
+potential, is taken as the zeroth-order approximation. Explicit expressions are
+given for the total energy through 3rd-order, which satisfy the 2N + 1 rule
+(i.e. requiring only the 1st-order perturbed wave function for determining the
+energy through 3rd-order). Expressions for additional 2nd-order corrections to
+the perturbed wave function (as well as related one-electron properties) are
+worked out at the uncoupled-perturbed level of theory. The approach is
+implemented in the \textsc{Crystal} program and validated with calculations of
+the total energy, electronic band structure, and density variables of
+spin-current DFT on the tungsten dichalcogenide hexagonal bilayer series (i.e.
+WSe$_2$, WTe$_2$, WPo$_2$, WLv$_2$), including 6p and 7p elements as a stress
+test. The computed properties through second- or third-order match well with
+those from reference two-component self-consistent field (2c-SCF) calculations.
+For total energies, $E^{(3)}$ was found to consistently improve the agreement
+against the 2c-SCF reference values. For electronic band structures, visible
+differences w.r.t. 2c-SCF remained through second-order in only the single-most
+difficult case of WLv$_2$. As for density variables of spin-current DFT, the
+perturbed electron density, being vanishing in first-order, is the most
+challenging for the perturbation theory approach. The visible differences in
+the electron densities are, however, largest close to the core region of atoms
+and smaller in the valence region. Perturbed spin-current densities, on the
+other hand, are well reproduced in all tested cases.",2302.06143v1
+2021-03-11,"Intertwined charge, spin, and pairing orders in doped iron ladders","Motivated by recent experimental progress on iron-based ladder compounds, we
+study the doped two-orbital Hubbard model for the two-leg ladder BaFe$_2$S$_3$.
+The model is constructed by using {\it ab initio} hopping parameters and the
+ground state properties are investigated using the density matrix
+renormalization group method. We show that the $(\pi,0)$ magnetic ordering at
+half-filling, with ferromagnetic rungs and antiferromagnetic legs, becomes
+incommensurate upon hole doping. Moreover, depending on the strength of the
+Hubbard $U$ coupling, other magnetic patterns, such as $(0,\pi)$, are also
+stabilized. We found that the binding energy for two holes becomes negative for
+intermediate Hubbard interaction strength, indicating hole pairing. Due to the
+crystal-field split among orbitals, the holes primarily reside in one orbital,
+with the other one remaining half-filled. This resembles orbital selective Mott
+states. The formation of tight hole pairs continues with increasing hole
+density, as long as the magnetic order remains antiferromagnetic in one
+direction. The study of pair-pair correlations indicates the dominance of the
+intra-orbital spin-singlet channel, as opposed to other pairing channels.
+Although in a range of hole doping pairing correlations decay slowly, our
+results can also be interpreted as corresponding to a charge-density-wave made
+of pairs, a precursor of eventual superconductivity after interladder couplings
+are included. Such scenario of intertwined orders has been extensively
+discussed before in the cuprates, and our results suggest a similar physics
+could exist in ladder iron-based superconductors. Finally, we also show that a
+robust Hund's coupling is needed for pairing to occur.",2103.06407v2
+2021-10-13,"A Combined First Principles Study of the Structural, Magnetic, and Phonon Properties of Monolayer CrI$_{3}$","The first magnetic 2D material discovered, monolayer (ML) CrI$_3$, is
+particularly fascinating due to its ground state ferromagnetism. Yet, because
+monolayer materials are difficult to probe experimentally, much remains
+unresolved about ML CrI$_{3}$'s structural, electronic, and magnetic
+properties. Here, we leverage Density Functional Theory (DFT) and high-accuracy
+Diffusion Monte Carlo (DMC) simulations to predict lattice parameters, magnetic
+moments, and spin-phonon and spin-lattice coupling of ML CrI$_{3}$. We exploit
+a recently developed surrogate Hessian DMC line search technique to determine
+CrI$_{3}$'s monolayer geometry with DMC accuracy, yielding lattice parameters
+in good agreement with recently-published STM measurements - an accomplishment
+given the $\sim 10$% variability in previous DFT-derived estimates depending
+upon the functional. Strikingly, we find previous DFT predictions of ML
+CrI$_3$'s magnetic spin moments are correct on average across a unit cell, but
+miss critical local spatial fluctuations in the spin density revealed by more
+accurate DMC. DMC predicts magnetic moments in ML CrI$_3$ are 3.62 $\mu_B$ per
+chromium and -0.145 $\mu_B$ per iodine; both larger than previous DFT
+predictions. The large disparate moments together with the large spin-orbit
+coupling of CrI$_3$'s I-$\textit{p}$ orbital suggests a ligand
+superexchange-dominated magnetic anisotropy in ML CrI$_3$, corroborating recent
+observations of magnons in its 2D limit. We also find ML CrI$_3$ exhibits a
+substantial spin-phonon coupling of $\sim$3.32 cm$^{-1}$. Our work thus
+establishes many of ML CrI$_{3}$'s key properties, while also continuing to
+demonstrate the pivotal role DMC can assume in the study of magnetic and other
+2D materials.",2110.06731v1
+2022-02-27,A topological realization of spin polarization through vortex formation in collisions of Bose-Einstein condensates,"The global spin polarization of hadrons in heavy ion collisions has been
+measured in STAR (the Solenoidal Tracker At Relativistic heavy ion collider)
+experiments, which opens up a new window in the study of the hottest, least
+viscous and most vortical fluid that has ever been produced in the laboratory.
+We present a different approach to spin polarization from conventional ones: a
+topological realization of spin polarization through quantum vortex formation
+in collisions of Bose-Einstein condensates (BEC). This approach is based on the
+observation that the vortex is a topological excitation in a superfluid in
+presence of local orbital angular momentum and is an analogue of spin degrees
+of freedom. The formation processes of vortices and vortex-antivortex pairs are
+investigated by solving the Gross-Pitaevskii Equation with a large-scale
+parallel algorithm on Graphics Processing Unit (GPU) to very high precision. In
+a rotating environment, the primary vortex with winding number one is stable
+against perturbation, which has a minimal energy and fixed orbital angular
+momentum (OAM), but the vortices with larger winding numbers are unstable and
+will decay into primary vortices through a redistribution of the energy and
+vorticity. The injection of OAM can also be realized in non-central collisions
+of self-interacting condensates, part of the OAM of the initial state will
+induce the formation of vortices through concentration of energy and vorticity
+density around topological defects. Different from a hydrodynamical
+description, the interference of the wave function plays an important role in
+the transport of energy and vorticity, reflecting the quantum nature of the
+vortex formation process. The study of the vortex formation may shed light on
+the nature of particle spin and spin-orbit couplings in strong interaction
+matter produced in heavy-ion collisions.",2202.13300v3
+2006-12-19,Fingerprints of Spin-Orbital Physics in Crystalline O$_2$,"The alkali hyperoxide KO$_2$ is a molecular analog of strongly-correlated
+systems, comprising of orbitally degenerate magnetic O$_2^-$ ions. Using
+first-principles electronic structure calculations, we set up an effective
+spin-orbital model for the low-energy \textit{molecular} orbitals and argue
+that many anomalous properties of KO$_2$ replicate the status of its orbital
+system in various temperature regimes.",0612475v1
+2016-07-06,Introduction of spin-orbit interaction into graphene with hydrogenation,"Introduction of spin-orbit interaction (SOI) into graphene with weak
+hydrogenation ($\sim$0.1\%) by dissociation of hydrogen silsesquioxane resist
+has been confirmed through the appearance of inverse spin Hall effect. The spin
+current was produced by spin injection from permalloy electrodes excluding
+non-spin relating experimental artifact.",1607.01558v1
+2003-12-18,"Searching for Gravitational Waves from the Inspiral of Precessing Binary Systems: Astrophysical Expectations and Detection Efficiency of ""Spiky'' Templates","Relativistic spin-orbit and spin-spin couplings has been shown to modify the
+gravitational waveforms expected from inspiraling binaries with a black hole
+and a neutron star. As a result inspiral signals may be missed due to
+significant losses in signal-to-noise ratio, if precession effects are ignored
+in gravitational-wave searches. We examine the sensitivity of the anticipated
+loss of signal-to-noise ratio on two factors: the accuracy of the precessing
+waveforms adopted as the true signals and the expected distributions of
+spin-orbit tilt angles, given the current understanding of their physical
+origin. We find that the results obtained using signals generated by
+approximate techniques are in good agreement with the ones obtained by
+integrating the 2PN equations. This shows that a complete account of all
+high-order post-Newtonian effects is usually not necessary for the
+determination of detection efficiencies. Based on our current astrophysical
+expectations, large tilt angles are not favored and as a result the decrease in
+detection rate varies rather slowly with respect to the black hole spin
+magnitude and is within 20--30% of the maximum possible values.",0312084v2
+2009-09-26,Time-reversal-protected single-Dirac-cone topological-insulator states in Bi2Te3 and Sb2Te3: Topologically Spin-polarized Dirac fermions with pi Berry's Phase,"We show that the strongly spin-orbit coupled materials Bi2Te3 and Sb2Te3
+(first non-Bi topological insulator) and their derivatives belong to the Z2
+(Time-Reversal-Protected, elastic backscattering suppressed)
+topological-insulator class. Using a combination of first-principles
+theoretical calculations and photoemission spectroscopy, we directly show that
+Bi2Te3 is a large spin-orbit-induced indirect bulk band gap (about 150 meV)
+semiconductor whose surface is characterized by a single topological spin-Dirac
+cone. The electronic structure of self-doped Sb2Te3 exhibits similar Z2
+topological properties. We demonstrate that the dynamics of surface spin-only
+Dirac fermions can be controlled through systematic Mn doping, making these
+materials classes potentially suitable for exploring novel topological physics.
+We emphasize (theoretically and experimentally) that the Dirac node is well
+within the bulk-gap and not degenerate with the bulk valence band.",0909.4804v1
+2010-07-29,Spectral analysis for the iron-based superconductors: Anisotropic spin fluctuations and fully gapped s^{\pm}-wave superconductivity,"Spin fluctuations are considered to be one of the candidates that drive a
+sign-reversed s^{\pm} superconducting state in the iron pnictides. In the
+magnetic scenario, whether the spin fluctuation spectrum exhibits certain
+unique fine structures is an interesting aspect for theoretical study in order
+to understand experimental observations. We investigate the detailed momentum
+dependence of the short-range spin fluctuations using a 2-orbital model in the
+self-consistent fluctuation exchange approximation and find that a common
+feature of those fluctuations that are capable of inducing a fully gapped
+s^{\pm} state is the momentum anisotropy with lengthened span along the
+direction transverse to the antiferromagnetic momentum transfer. Performing a
+qualitative analysis based on the orbital character and the deviation from
+perfect nesting of the electronic structure for the 2-orbital and a more
+complete 5-orbital model, we gain the insight that this type of anisotropic
+spin fluctuations favor superconductivity due to their enhancement of
+intra-orbital, but inter-band, pair scattering processes. The momentum
+anisotropy leads to elliptically shaped magnetic responses which have been
+observed in inelastic neutron scattering measurements. Meanwhile, our detailed
+study on the magnetic and the electronic spectrum shows that the dispersion of
+the magnetic resonance mode in the nearly isotropic s^{\pm} superconducting
+state exhibits anisotropic propagating behavior in an upward pattern and the
+coupling of the resonance mode to fermions leads to a dip feature in the
+spectral function.",1007.5321v3
+2012-10-16,Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9,"We report the structural transformation of hexagonal Ba3YIr2O9 to a cubic
+double perovskite form (stable in ambient conditions) under an applied pressure
+of 8GPa at 1273K. While the ambient pressure (AP) synthesized sample undergoes
+long-range magnetic ordering at 4K, the high pressure(HP) synthesized sample
+does not order down to 2K as evidenced from our susceptibility, heat capacity
+and nuclear magnetic resonance (NMR) measurements. Further, for the HP sample,
+our heat capacity data have the form gamma*T+beta*T3 in the temperature (T)
+range of 2-10K with the Sommerfeld coefficient gamma=10mJ/mol-Ir K2. The 89Y
+NMR shift has no T-dependence in the range of 4-120K and its spin-lattice
+relaxation rate varies linearly with T in the range of 8-45K (above which it is
+T-independent). Resistance measurements of both the samples confirm that they
+are semiconducting. Our data provide evidence for the formation of a 5d based,
+gapless, quantum spin-liquid (QSL) in the cubic (HP) phase of Ba3YIr2O9. In
+this picture, the T term in the heat capacity and the linear variation of 89Y
+1/T1 arises from excitations out of a spinon Fermi surface. Our findings lend
+credence to the theoretical suggestion [G. Chen, R. Pereira, and L. Balents,
+Phys. Rev. B 82, 174440 (2010)] that strong spin-orbit coupling can enhance
+quantum fluctuations and lead to a QSL state in the double perovskite lattice.",1210.4355v3
+2015-03-27,Nonequilibrium spin texture within a thin layer below the surface of current-carrying topological insulator Bi$_2$Se$_3$: A first-principles quantum transport study,"We predict that unpolarized charge current injected into a ballistic thin
+film of prototypical topological insulator (TI) Bi$_2$Se$_3$ will generate a
+{\it noncollinear spin texture} $\mathbf{S}(\mathbf{r})$ on its surface.
+Furthermore, the nonequilibrium spin texture will extend into $\simeq 2$ nm
+thick layer below the TI surfaces due to penetration of evanescent
+wavefunctions from the metallic surfaces into the bulk of TI. Averaging
+$\mathbf{S}(\mathbf{r})$ over few \AA{} along the longitudinal direction
+defined by the current flow reveals large component pointing in the transverse
+direction. In addition, we find an order of magnitude smaller out-of-plane
+component when the direction of injected current with respect to Bi and Se
+atoms probes the largest hexagonal warping of the Dirac-cone dispersion on TI
+surface. Our analysis is based on an extension of the nonequilibrium Green
+functions combined with density functional theory (NEGF+DFT) to situations
+involving noncollinear spins and spin-orbit coupling. We also demonstrate how
+DFT calculations with properly optimized local orbital basis set can precisely
+match putatively more accurate calculations with plane-wave basis set for the
+supercell of Bi$_2$Se$_3$.",1503.08046v2
+2015-06-08,Aspects of Neutrino Oscillation in Alternative Gravity Theories,"Neutrino spin and flavour oscillation in curved spacetime have been studied
+for the most general static spherically symmetric configuration. Using the
+symmetry properties we have derived spin oscillation frequency for neutrino
+moving along a geodesic or in a circular orbit. Starting from the expression of
+neutrino spin oscillation frequency we have shown that even in this general
+context, in high energy limit the spin oscillation frequency for neutrino
+moving along circular orbit vanishes. This finally lends itself to non-zero
+probability of neutrino helicity flip. While for neutrino flavour oscillation
+we have derived general results for oscillation phase, which subsequently have
+been applied to different gravity theories. These include dilaton field coupled
+to Maxwell field tensor, generalization of Schwarzschild solution by
+introduction of quadratic curvature terms of all possible form to the
+Einstein-Hilbert action and finally regular black hole solutions. In all these
+cases using the solar neutrino oscillation data we can put bounds on the
+parameters of these gravity theories. While for spin oscillation probability,
+we have considered two cases, Gauss-Bonnet term added to the Einstein-Hilbert
+action and the f(R) gravity theory. In both these cases we could impose bounds
+on the parameters which are consistent with previous considerations.
+Implications are also discussed.",1506.02647v2
+2017-02-27,Current Induced Damping of Nanosized Quantum Moments in the Presence of Spin-Orbit Interaction,"Motivated by the need to understand current-induced magnetization dynamics at
+the nanoscale, we have developed a formalism, within the framework of Keldysh
+Green function approach, to study the current-induced dynamics of a
+ferromagnetic (FM) nanoisland overlayer on a spin-orbit-coupling (SOC) Rashba
+plane. In contrast to the commonly employed classical micromagnetic LLG
+simulations the magnetic moments of the FM are treated {\it quantum
+mechanically}. We obtain the density matrix of the whole system consisting of
+conduction electrons entangled with the local magnetic moments and calculate
+the effective damping rate of the FM. We investigate two opposite limiting
+regimes of FM dynamics: (1) The precessional regime where the magnetic
+anisotropy energy (MAE) and precessional frequency are smaller than the
+exchange interactions, and (2) The local spin-flip regime where the MAE and
+precessional frequency are comparable to the exchange interactions. In the
+former case, we show that due to the finite size of the FM domain, the
+\textquotedblleft Gilbert damping\textquotedblright does not diverge in the
+ballistic electron transport regime, in sharp contrast to Kambersky's breathing
+Fermi surface theory for damping in metallic FMs. In the latter case, we show
+that above a critical bias the excited conduction electrons can switch the
+local spin moments resulting in demagnetization and reversal of the
+magnetization. Furthermore, our calculations show that the bias-induced
+antidamping efficiency in the local spin-flip regime is much higher than that
+in the rotational excitation regime.",1702.08408v2
+2016-11-15,Quantum Spin-quantum Anomalous Hall Effect with Tunable Edge States in Sb Monolayer-based Heterostructures,"A novel topological insulator with tunable edge states, called quantum
+spin-quantum anomalous Hall (QSQAH) insulator, is predicted in a
+heterostructure of a hydrogenated Sb (SbH) monolayer on a LaFeO3 substrate by
+using ab initio methods. The substrate induces a drastic staggered exchange
+field in the SbH film, which plays an important role to generate the QSQAH
+effect. A topologically nontrivial band gap (up to 35 meV) is opened by Rashba
+spin-orbit coupling, which can be enlarged by strain and electric field. To
+understand the underlying physical mechanism of the QSQAH effect, a
+tight-binding model based on px and py orbitals is constructed. With the model,
+the exotic behaviors of the edge states in the heterostructure are
+investigated. Dissipationless chiral charge edge states related to one valley
+are found to emerge along the both sides of the sample, while low-dissipation
+spin edge states related to the other valley flow only along one side of the
+sample. These edge states can be tuned flexibly by polarization-sensitive
+photoluminescence controls and/or chemical edge modifications. Such flexible
+manipulations of the charge, spin, and valley degrees of freedom provide a
+promising route towards applications in electronics, spintronics, and
+valleytronics.",1611.04715v2
+2018-05-24,Role of oxygen vacancy in the spin-state change and magnetic ordering in SrCoO$_{3-δ}$,"We present the first-principles investigation of the structural, electronic,
+and magnetic properties of SrCoO$_{3-\delta}$ ($\delta=0, 0.25, 0.5$) to
+understand the multivalent nature of Co ions in SrCoO$_{3-\delta}$ along the
+line of topotactic transition between perovskite SrCoO$_{3}$ and brownmillerite
+SrCoO$_{2.5}$. From the on-site Coulomb interaction $U$-dependent ground state
+of stoichiometric SrCoO$_{3}$, we show the proximity of its metallic
+ferromagnetic ground state to other antiferromagnetic states. The structural
+and magnetic properties of SrCoO$_{3-\delta}$ depending on their oxygen-content
+provide an interesting insight into the relationship between the Co-Co
+distances and the magnetic couplings so that the spin-state transition of Co
+spins can understood by the change of $pd$-hybridization depending on the Co-Co
+distances. The \emph{strong} suppression of the $dp\sigma$-hybridization
+between Co $d$ and O $p$ orbitals in brownmillerite SrCoO$_{2.5}$ brings on the
+high-spin state of Co$^{3+}$ $d^{6}$ and is responsible for the
+antiferromagnetically ordered insulating ground state. The increase of
+effective Co-Co distances driven by the presence of oxygen vacancies in
+SrCoO$_{3-\delta}$ is consistent with the reduction of the effective
+$pd$-hybridization between Co $d$ and O $p$ orbitals. We conclude that the
+configuration of neighboring Co spins is shown to be crucial to their local
+electronic structure near the metal-to-insulator transition along the line of
+the topotactic transition in SrCoO$_{3-\delta}$. Incidentally, we also find
+that the \textit{I2mb} symmetry of SrCoO$_{2.5}$ is energetically stable and
+exhibits ferroelectricity via the ordering of CoO$_{4}$ tetrahedra, where this
+polar lattice can be stabilized by the presence of a large activation barrier.",1805.09524v1
+2012-01-22,Spin Hall effect in a Kagome lattice driven by Rashba spin-orbit interaction,"Using four-terminal Landauer-B\""{u}ttiker formalism and Green's function
+technique, in this present paper, we calculate numerically spin Hall
+conductance (SHC) and longitudinal conductance of a finite size kagome lattice
+with Rashba spin-orbit (SO) interaction both in presence and absence of
+external magnetic flux in clean limit. In the absence of magnetic flux, we
+observe that depending on the Fermi surface topology of the system SHC changes
+its sign at different values of Fermi energy, along with the band center.
+Unlike the infinite system (where SHC is a universal constant $\pm \frac{e}{8
+\pi}$), here SHC depends on the external parameters like SO coupling strength,
+Fermi energy, etc. We show that in the presence of any arbitrary magnetic flux,
+periodicity of the system is lost and the features of SHC tends to get reduced
+because of elastic scattering. But again at some typical values of flux
+($\phi=1/2, 1/4, 3/4..., etc.) the system retains its periodicity depending on
+its size and the features of spin Hall effect (SHE) reappears. Our predicted
+results may be useful in providing a deeper insight into the experimental
+realization of SHE in such geometries.",1201.4563v4
+2012-04-02,Floquet spin states in graphene under ac driven spin-orbit interaction,"We study the role of periodically driven time-dependent Rashba spin-orbit
+coupling (RSOC) on a monolayer graphene sample. After recasting the originally
+$4\times 4$ system of dynamical equations as two time-reversal related
+two-level problems, the quasi-energy spectrum and the related dynamics are
+investigated via various techniques and approximations. In the static case the
+system is a gapped at the Dirac point. The rotating wave approximation (RWA)
+applied to the driven system unphysically preserves this feature, while the
+Magnus-Floquet approach as well as a numerically exact evaluation of the
+Floquet equation show that this gap is dynamically closed. In addition, a
+sizable oscillating pattern of the out-of-plane spin polarization is found in
+the driven case for states which completely unpolarized in the static limit.
+Evaluation of the autocorrelation function shows that the original uniform
+interference pattern corresponding to time-independent RSOC gets distorted. The
+resulting structure can be qualitatively explained as a consequence of the
+transitions induced by the ac driving among the static eigenstates, i.e., these
+transitions modulate the relative phases that add up to give the quantum
+revivals of the autocorrelation function. Contrary to the static case, in the
+driven scenario, quantum revivals (suppresions) are correlated to spin up
+(down) phases.",1204.0404v2
+2017-10-06,Optimal control of universal quantum gates in a double quantum dot,"We theoretically investigate electron spin operations driven by applied
+electric fields in a semiconductor double quantum dot (DQD). Our model
+describes a DQD formed in semiconductor nanowire with longitudinal potential
+modulated by local gating. The eigenstates for two electron occupation,
+including spin-orbit interaction, are calculated and then used to construct a
+model for the charge transport cycle in the DQD taking into account the spatial
+dependence and spin mixing of states. The dynamics of the system is simulated
+aiming at implementing protocols for qubit operations, that is, controlled
+transitions between the singlet and triplet states. In order to obtain fast
+spin manipulation, the dynamics is carried out taking advantage of the
+anticrossings of energy levels introduced by the spin-orbit and interdot
+couplings. The theory of optimal quantum control is invoked to find the
+specific electric-field driving that performs qubit logical operations. We
+demonstrate that it is possible to perform within high efficiency a universal
+set of quantum gates $\{$CNOT, H$\otimes$I, I$\otimes$H, T$\otimes$I, and
+T$\otimes$I$\}$, where H is the Hadamard gate, T is the $\pi/8$ gate, and I is
+the identity, even in the presence of a fast charge transport cycle and charge
+noise effects.",1710.02499v1
+2020-12-21,Spin-orbit-assisted electron pairing in 1D waveguides,"Understanding and controlling the transport properties of interacting
+fermions is a key forefront in quantum physics across a variety of experimental
+platforms. Motivated by recent experiments in 1D electron channels written on
+the $\mathrm{LaAlO_3}$/$\mathrm{SrTiO_3}$ interface, we analyse how the
+presence of different forms of spin-orbit coupling (SOC) can enhance electron
+pairing in 1D waveguides. We first show how the intrinsic Rashba SOC felt by
+electrons at interfaces such as $\mathrm{LaAlO_3}$/$\mathrm{SrTiO_3}$ can be
+reduced when they are confined in 1D. Then, we discuss how SOC can be
+engineered, and show using a mean-field Hartree-Fock-Bogoliubov model that SOC
+can generate and enhance spin-singlet and triplet electron pairing. Our results
+are consistent with two recent sets of experiments [Briggeman et al.,
+arXiv:1912.07164; Sci. Adv. 6, eaba6337 (2020)] that are believed to engineer
+the forms of SOC investigated in this work, which suggests that metal-oxide
+heterostructures constitute attractive platforms to control the collective spin
+of electron bound states. However, our findings could also be applied to other
+experimental platforms involving spinful fermions with attractive interactions,
+such as cold atoms.",2012.11425v1
+2019-12-04,Thermodynamic Evidence of Proximity to a Kitaev Spin-Liquid in Ag$_{3}$LiIr$_{2}$O$_{6}$,"Kitaev magnets are materials with bond-dependent Ising interactions between
+localized spins on a honeycomb lattice. Such interactions could lead to a
+quantum spin-liquid (QSL) ground state at zero temperature. Recent theoretical
+studies suggest two potential signatures of a QSL at finite temperatures,
+namely a scaling behavior of thermodynamic quantities in the presence of
+quenched disorder, and a two-step release of the magnetic entropy. Here, we
+present both signatures in Ag$_{3}$LiIr$_{2}$O$_{6}$ which is synthesized from
+$\alpha$-Li$_{2}$IrO$_{3}$ by replacing the inter-layer Li atoms with Ag atoms.
+In addition, the DC susceptibility data confirm absence of a long-range order,
+and the AC susceptibility data rule out a spin-glass transition. These
+observations suggest a closer proximity to the QSL in Ag$_{3}$LiIr$_{2}$O$_{6}$
+compared to its parent compound $\alpha$-Li$_{2}$IrO$_{3}$ that orders at 15 K.
+We discuss an enhanced spin-orbit coupling due to a mixing between silver d and
+oxygen p orbitals as a potential underlying mechanism.",1912.02118v1
+2015-08-12,Strong interface-induced spin-orbit coupling in graphene on WS2,"Interfacial interactions allow the electronic properties of graphene to be
+modified, as recently demonstrated by the appearance of satellite Dirac cones
+in the band structure of graphene on hexagonal boron nitride (hBN) substrates.
+Ongoing research strives to explore interfacial interactions in a broader class
+of materials in order to engineer targeted electronic properties. Here we show
+that at an interface with a tungsten disulfide (WS2) substrate, the strength of
+the spin-orbit interaction (SOI) in graphene is very strongly enhanced. The
+induced SOI leads to a pronounced low-temperature weak anti-localization (WAL)
+effect, from which we determine the spin-relaxation time. We find that
+spin-relaxation time in graphene is two-to-three orders of magnitude smaller on
+WS2 than on SiO2 or hBN, and that it is comparable to the intervalley
+scattering time. To interpret our findings we have performed first-principle
+electronic structure calculations, which both confirm that carriers in
+graphene-on-WS2 experience a strong SOI and allow us to extract a
+spin-dependent low-energy effective Hamiltonian. Our analysis further shows
+that the use of WS2 substrates opens a possible new route to access topological
+states of matter in graphene-based systems.",1508.02912v1
+2019-06-04,Tuning spin filtering by anchoring groups in benzene derivative molecular junctions,"One of the important issues of molecular spintronics is the control and
+manipulation of charge transport and, in particular, its spin polarization
+through single-molecule junctions. Using $ab$ $initio$ calculations, we explore
+spin-polarized electron transport across single benzene derivatives attached
+with six different anchoring groups (S, CH$_3$S, COOH, CNH$_2$NH, NC and
+NO$_2$) to Ni(111) electrodes. We find that molecule-electrode coupling,
+conductance and spin polarization (SP) of electric current can be modified
+significantly by anchoring groups. In particular, a high spin polarization (SP
+$>$ 80%) and a giant magnetoresistance (MR $>$ 140%) can be achieved for NO$_2$
+terminations and, more interestingly, SP can be further enhanced (up to 90%) by
+a small voltage. The S and CH$_3$S systems, on the contrary, exhibit rather low
+SP while intermediate values are found for COOH and CNH$_2$NH groups. The
+results are analyzed in detail and explained by orbital symmetry arguments,
+hybridization and spatial localization of frontier molecular orbitals. We hope
+that our comparative and systematic studies will provide valuable quantitative
+information for future experimental measurements on that kind of systems and
+will be useful for designing high-performance spintronics devices.",1906.01429v3
+2019-06-24,"Weak ferromagnetism in hexagonal Mn3Z (Z=Sn, Ge, Ga) alloys","We present combined spin model and first principles electronic structure
+calculations to study the weak ferromagnetism in bulk Mn$_3$Z (Z=Sn, Ge, Ga)
+compounds. The spin model parameters were determined from a spin-cluster
+expansion technique based on the relativistic disordered local moment formalism
+implemented in the screened Korringa--Kohn--Rostoker method. We describe the
+magnetic ground state of the system within a three-sublattice model and
+investigate the formation of the weak ferromagnetic states in terms of the
+relevant model parameters. First, we give a group-theoretical argument how the
+point-group symmetry of the lattice leads to the formation of weak
+ferromagnetic states. Then we study the ground states of the classical spin
+model and derive analytical expressions for the weak ferromagnetic distortions
+by recovering the main results of the group-theoretical analysis. As a third
+approach we obtain the weak ferromagnetic ground states from self-consistent
+density functional calculations and compare our results with previous first
+principles calculations and with available experimental data. In particular, we
+demonstrate that the orbital moments follow a decomposition predicted by group
+theory. For a deeper understanding of the formation of weak ferromagnetism we
+selectively trace the effect of the spin-orbit coupling at the Mn and Z sites.
+In addition, for the case of Mn$_3$Ga, we gain information on the role of the
+induced moment of Ga from constrained local density functional calculations.",1906.10062v1
+2021-12-06,First principles theory for the magnetic and charge instabilities in AV$_3$Sb$_5$ systems,"Vanadium-based materials AV$_3$Sb$_5$ (A=K, Rb, Cs) with layered kagome
+lattice structures have drawn great attention recently due to the discoveries
+of topologically nontrivial band structures, charge density wave states, giant
+anomalous Hall effect, as well as unusual superconducting phase at low
+temperatures. In this work, we theoretically study the magnetic and charge
+instabilities for this class of materials based on first principles
+calculations. We develop a method to calculate the generalized susceptibility
+tensor defined in the sublattice-orbital-spin space, with the effects of
+Coulomb interactions treated by generalized random phase approximation (RPA).
+The RPA susceptibility calculations indicate that there are three leading
+ferromagnetic instability modes at $\Gamma$ point, which are further verified
+by unrestricted self-consistent Hartree-Fock calculations including both the
+on-site and inter-site Coulomb interactions. The inclusion of inter-site
+interactions tend to suppress the spin ferromagnetism due to charge transfer
+from the V to Sb sites, leading to weak spin magnetic moments $\sim
+0.1\mu_{\textrm{B}}$ per V atom with small intrinsic anomalous Hall
+conductivity. Current loops can be generated in such weak spin ferromagnetic
+states as a result of spin-orbit coupling effects. The electronic structures in
+the ferromagnetic states are significantly reconstructed which have nearly
+compensated electron and hole carriers from two bands. On the other hand, we do
+not find any diverging instability mode at $M$ point driven by
+electron-electron Coulomb interactions. First principles phonon calculations
+indicate that there are unstable phonon modes which tend to drive the system
+into an inverse star-of-David structure. Our results indicate that there may be
+separate phase transitions in the magnetic and charge channels in the system.",2112.02808v1
+2022-03-22,Quantum sensing and imaging of spin-orbit-torque-driven spin dynamics in noncollinear antiferromagnet Mn3Sn,"Novel noncollinear antiferromagnets with spontaneous time-reversal symmetry
+breaking, nontrivial band topology, and unconventional transport properties
+have received immense research interest over the past decade due to their rich
+physics and enormous promise in technological applications. One of the central
+focuses in this emerging field is exploring the relationship between the
+microscopic magnetic structure and exotic material properties. Here, the
+nanoscale imaging of both spin-orbit-torque-induced deterministic magnetic
+switching and chiral spin rotation in noncollinear antiferromagnet Mn3Sn films
+using nitrogen-vacancy (NV) centers is reported. Direct evidence of the
+off-resonance dipole-dipole coupling between the spin dynamics in Mn3Sn and
+proximate NV centers is also demonstrated with NV relaxometry measurements.
+These results demonstrate the unique capabilities of NV centers in accessing
+the local information of the magnetic order and dynamics in these emergent
+quantum materials and suggest new opportunities for investigating the interplay
+between topology and magnetism in a broad range of topological magnets.",2203.11465v1
+2022-09-14,From the gates of the abyss: Frequency- and polarization-dependent lensing of gravitational waves in strong gravitational fields,"The propagation of gravitational waves can be described in terms of null
+geodesics by using the geometrical optics approximation. However, at large but
+finite frequencies the propagation is affected by the spin-orbit coupling
+corrections to geometrical optics, known as the gravitational spin Hall effect.
+Consequently, gravitational waves follow slightly different frequency- and
+polarization-dependent trajectories, leading to dispersive and birefringent
+phenomena. We study the potential for detecting the gravitational spin Hall
+effect in hierarchical triple black hole systems, consisting of an emitting
+binary orbiting a more massive body acting as a gravitational lens. We
+calculate the difference in time of arrival with respect to the geodesic
+propagation and find that it follows a simple power-law dependence on frequency
+with a fixed exponent. We calculate the gravitational spin Hall-corrected
+waveform and its mismatch with respect to the original waveform. The waveform
+carries a measurable imprint of the strong gravitational field if the source,
+lens, and observer are sufficiently aligned, or for generic observers if the
+source is close enough to the lens. We present constraints on dispersive time
+delays from GWTC-3, translated from limits on Lorentz invariance violation.
+Finally, we address the sensitivity of current and future ground detectors to
+dispersive lensing. Our results demonstrate that the gravitational spin Hall
+effect can be detected, providing a novel probe of general relativity and the
+environments of compact binary systems.",2209.06459v2
+2023-03-05,Circular Dichroism of Crystals from First Principles,"Chiral crystals show promise for spintronic technologies on account of their
+high spin selectivity, which has led to significant recent interest in
+quantitative characterization and first-principles prediction of their
+spin-optoelectronics properties. Here, we outline a computational framework for
+efficient ab-initio calculations of circular dichroism (CD) in crystalline
+materials. We leverage direct calculations of orbital angular momentum and
+quadrupole matrix element calculations in density-functional theory (DFT) and
+Wannier interpolation to calculate CD in complex materials, removing the need
+for band convergence and accelerating Brillouin-zone convergence compared to
+prior approaches. We find strong agreement with measured CD signals in
+molecules and crystals ranging in complexity from small bulk unit cells to 2D
+hybrid perovskites, and show the importance of the quadrupole contribution to
+the anisotropic CD in crystals. Spin-orbit coupling affects the CD of crystals
+with heavier atoms, as expected, but this is primarily due to changes in the
+electronic energies, rather than due to direct contributions from the spin
+matrix elements. We showcase the capability to predict CD for complex
+structures on a 2D hybrid perovskite, finding strong orientation dependence and
+identifying the eigen-directions of the unit cell with the strongest CD. We
+additionally decompose CD into separate contributions from inorganic, organic,
+and mixed organic-inorganic transitions, finding the chiral molecules to
+dominate the CD, with the inorganic lattice contributing at higher frequencies
+in specific directions. This unprecedented level of detail in CD predictions in
+crystals will facilitate experimental development of complex chiral crystals
+for spin selectivity.",2303.02764v2
+2024-03-28,Tuning intrinsic anomalous Hall effect from large to zero in two ferromagnetic states of SmMn2Ge2,"The intrinsic anomalous Hall conductivity (AHC) in a ferromagnetic metal is
+completely determined by its band structure. Since the spin orientation
+direction is an important band structure tuning parameter, it is highly
+desirable to study the anomalous Hall effect in a system with multiple spin
+reorientation transitions. We study a layered tetragonal room temperature
+ferromagnet SmMn2Ge2, which gives us the opportunity to measure
+magneto-transport properties where the long c-axis and the short a-axis can
+both be magnetically easy axes depending on the temperature range we choose. We
+show a moderately large fully intrinsic AHC up to room temperature when the
+crystal is magnetized along the c-axis. Interestingly, the AHC can be tuned to
+completely extrinsic with extremely large values when the crystal is magnetized
+along the a-axis, regardless of whether the a-axis is magnetically easy or hard
+axis. First principles calculations show that nodal line states originate from
+Mn-d orbitals just below the Fermi energy (EF) in the electronic band structure
+when the spins are oriented along the c-axis. Intrinsic AHC originates from the
+Berry curvature effect of the gapped nodal lines in the presence of spin-orbit
+coupling. AHC almost disappears when the spins are aligned along the a-axis
+because the nodal line states shift above EF and become unoccupied states.
+Since the AHC can be changed from fully extrinsic to intrinsic even at 300 K,
+SmMn2Ge2 becomes a potential candidate for room temperature spintronics
+applications.",2403.19581v2
+2017-07-31,Color superfluidity of neutral ultra-cold fermions in the presence of color-flip and color-orbit fields,"We describe how color superfluidity is modified in the presence of color-flip
+and color-orbit fields in the context of ultra-cold atoms, and discuss
+connections between this problem and that of color superconductivity in quantum
+chromodynamics. We consider s-wave contact interactions between different
+colors, and we identify superfluid phases, with five being nodal and one being
+fully gapped. When our system is described in a mixed color basis, the
+superfluid order parameter tensor is characterized by six independent
+components with explicit momentum dependence induced by color-orbit coupling.
+The nodal superfluid phases are topological in nature, and the low temperature
+phase diagram of color-flip field versus interaction parameter exhibits a
+pentacritical point, where all five nodal color superfluid phases converge.
+These results are in sharp contrast to the case of zero color-flip and
+color-orbit fields, where the system has perfect U(3) symmetry and possess a
+superfluid phase that is characterized by fully gapped quasiparticle
+excitations with a single complex order parameter with no momentum dependence
+and by inert unpaired fermions representing a non-superfluid component.
+Furthermore, we analyse the order parameter tensor in a total pseudo-spin
+basis, investigate its momentum dependence in the singlet, triplet and quintet
+sectors, and compare the results with the simpler case of spin-1/2 fermions in
+the presence of spin-flip and spin-orbit fields. Finally, we analyse in detail
+spectroscopic properties of color superfluids in the presence of color-flip and
+color-orbit fields, such as the quasiparticle excitation spectrum, momentum
+distribution, and density of states to help characterize all the encountered
+topological quantum phases, which can be realized in fermionic isotopes of
+Lithium, Potassium and Ytterbium atoms with three internal states trapped.",1707.09923v2
+2022-12-19,Timing analysis of the 2022 outburst of the accreting millisecond X-ray pulsar SAX J1808.4$-$3658: hints of an orbital shrinking,"We present a pulse timing analysis of NICER observations of the accreting
+millisecond X-ray pulsar SAX J1808.4$-$3658 during the outburst that started on
+2022 August 19. Similar to previous outbursts, after decaying from a peak
+luminosity of $\simeq 1\times10^{36} \, \mathrm{erg \, s^{-1}}$ in about a
+week, the pulsar entered in a $\sim 1$ month-long reflaring stage. Comparison
+of the average pulsar spin frequency during the outburst with those previously
+measured confirmed the long-term spin derivative of
+$\dot{\nu}_{\textrm{SD}}=-(1.15\pm0.06)\times 10^{-15} \, \mathrm{Hz\,s^{-1}}$,
+compatible with the spin-down torque of a $\approx 10^{26} \, \mathrm{G \,
+cm^3}$ rotating magnetic dipole. For the first time in the last twenty years,
+the orbital phase evolution shows evidence for a decrease of the orbital
+period. The long-term behaviour of the orbit is dominated by a $\sim 11 \,
+\mathrm{s}$ modulation of the orbital phase epoch consistent with a $\sim 21 \,
+\mathrm{yr}$ period. We discuss the observed evolution in terms of a coupling
+between the orbit and variations in the mass quadrupole of the companion star.",2212.09778v2
+2017-06-20,On the timing properties of SAX J1808.4-3658 during its 2015 outburst,"We present a timing analysis of the 2015 outburst of the accreting
+millisecond X-ray pulsar SAX J1808.4-3658, using non-simultaneous XMM-Newton
+and NuStar observations. We estimate the pulsar spin frequency and update the
+system orbital solution. Combining the average spin frequency from the previous
+observed, we confirm the long-term spin down at an average rate
+$\dot{\nu}_{\text{SD}}=1.5(2)\times 10^{-15}$ Hz s$^{-1}$. We also discuss
+possible corrections to the spin down rate accounting for mass accretion onto
+the compact object when the system is X-ray active. Finally, combining the
+updated ephemerides with those of the previous outbursts, we find a long-term
+orbital evolution compatible with a binary expansion at a mean rate
+$\dot{P}_{orb}=3.6(4)\times 10^{-12}$ s s$^{-1}$, in agreement with previously
+reported values. This fast evolution is incompatible with an evolution driven
+by angular momentum losses caused by gravitational radiation under the
+hypothesis of conservative mass transfer. We discuss the observed orbital
+expansion in terms of non-conservative mass transfer and gravitational
+quadrupole coupling mechanism. We find that the latter can explain, under
+certain conditions, small fluctuations (of the order of few seconds) of the
+orbital period around a global parabolic trend. At the same time, a
+non-conservative mass transfer is required to explain the observed fast orbital
+evolution, which likely reflects ejection of a large fraction of mass from the
+inner Lagrangian point caused by the irradiation of the donor by the
+magneto-dipole rotator during quiescence (radio-ejection model). This strong
+outflow may power tidal dissipation in the companion star and be responsible of
+the gravitational quadrupole change oscillations.",1706.06554v1
+2019-07-08,Single and bilayer graphene on the topological insulator Bi$_2$Se$_3$: Electronic and spin-orbit properties from first principles,"We present a detailed study of the electronic and spin-orbit properties of
+single and bilayer graphene in proximity to the topological insulator
+Bi$_2$Se$_3$. Our approach is based on first-principles calculations, combined
+with symmetry derived model Hamiltonians that capture the low-energy band
+properties. We consider single and bilayer graphene on 1--3 quintuple layers of
+Bi$_2$Se$_3$ and extract orbital and proximity induced spin-orbit coupling
+(SOC) parameters. We find that graphene gets significantly hole doped (350
+meV), but the linear dispersion is preserved. The proximity induced SOC
+parameters are about 1 meV in magnitude, and are of valley-Zeeman type. The
+induced SOC depends weakly on the number of quintuple layers of Bi$_2$Se$_3$.
+We also study the effect of a transverse electric field, that is applied across
+heterostructures of single and bilayer graphene above 1 quintuple layer of
+Bi$_2$Se$_3$. Our results show that band offsets, as well as proximity induced
+SOC parameters can be tuned by the field. Most interesting is the case of
+bilayer graphene, in which the band gap, originating from the intrinsic dipole
+of the heterostructure, can be closed and reopened again, with inverted band
+character. The switching of the strong proximity SOC from the conduction to the
+valence band realizes a spin-orbit valve. Additonally, we find a giant increase
+of the proximity induced SOC of about 200%, when we decrease the interlayer
+distance between graphene and Bi$_2$Se$_3$ by only 10%. Finally, for a
+different substrate material Bi$_2$Te$_2$Se, band offsets are significantly
+different, with the graphene Dirac point located at the Fermi level, while the
+induced SOC strength stays similar in magnitude compared to the Bi$_2$Se$_3$
+substrate.",1907.03494v2
+2020-07-25,Accessing new magnetic regimes by tuning the ligand spin-orbit coupling in van der Waals magnets,"Van der Waals (VdW) materials have opened new directions in the study of low
+dimensional magnetism. A largely unexplored arena is the intrinsic tuning of
+VdW magnets toward new ground-states. The chromium trihalides provided the
+first such example with a change of inter-layer magnetic coupling emerging upon
+exfoliation. Here, we take a different approach to engineer new ground-states,
+not by exfoliation, but by tuning the spin-orbit coupling (SOC) of the
+non-magnetic ligand atoms (Cl,Br,I). We synthesize a three-halide series,
+CrCl$_{3-x-y}$Br$_{x}$I$_{y}$, and map their magnetic properties as a function
+of Cl, Br, and I content. The resulting triangular phase diagrams unveil a
+frustrated regime near CrCl$_{3}$. First-principles calculations confirm that
+the frustration is driven by a competition between the chromium and halide
+SOCs. Furthermore, we reveal a field-induced change of inter-layer coupling in
+the bulk of CrCl$_{3-x-y}$Br$_{x}$I$_{y}$ crystals at the same field as in the
+exfoliation experiments.",2007.12818v1
+2017-06-27,"Dirac, Rashba and Weyl type spin-orbit couplings: toward experimental realization in ultracold atoms","We propose a hierarchy set of minimal optical Raman lattice schemes toward
+the experimental realization of spin-orbit (SO) couplings of various types for
+ultracold atoms, including two-dimensional (2D) Dirac type of $C_4$ symmetry,
+2D Rashba and 3D Weyl types. These schemes are well accessible with current
+cold-atom technology, and in particular, a long-lived Bose-Einstein
+condensation of the 2D Dirac SO coupling has been experimentally proved. The
+generation of 2D Rashba and 3D Weyl types has an exquisite request that two
+sources of laser beams have distinct frequencies of factor-two difference.
+Surprisingly, we find that $^{133}$Cs atoms provide an ideal candidate for the
+realization. A common and essential feature is the absence of any fine-tuning
+and phase-locking in the realization, and the resulted SO coupled ultracold
+atoms have a long lifetime. These schemes essentially improve over the current
+experimental accessibility and controllability, and open new experimental
+platforms to study high-dimensional SO physics and novel topological phases
+with ultracold atoms.",1706.08961v2
+2016-12-10,Vortex-bright solitons in a spin-orbit coupled spin-$1$ condensate,"We study the vortex-bright solitons in a quasi-two-dimensional
+spin-orbit-coupled (SO-coupled) hyperfine spin-1 three-component Bose-Einstein
+condensate (BEC) using variational method and numerical solution of a
+mean-field model. The ground state of these vortex-bright solitons is radially
+symmetric for weak ferromagnetic and polar interactions. For a sufficiently
+strong ferromagnetic interaction, we observe the emergence of an asymmetric
+vortex-bright soliton as the ground state. We also numerically investigate
+stable moving solitons and binary collision between them. The present
+mean-field model is not Galilean invariant, and we use a Galilean-transformed
+model for generating the moving solitons. At low velocities, the head-on
+collision between two {\em in-phase} solitons results either in collapse or
+fusion of the soliton pair. On the other hand, in head-on collision, the two
+{\em out-of-phase} solitons strongly repel each other and trace back their
+trajectories before the actual collision. At low velocities, in a collision
+with an impact parameter, the {\em out-of-phase} solitons get deflected from
+their original trajectory like two rigid classical disks. These {\em
+out-of-phase solitons} behave like classical disks, and their collision
+dynamics is governed by classical laws of motion. However, at large velocities
+two SO-coupled spinor solitons, irrespective of phase difference, can pass
+through each other in a head-on collision like two quantum solitons.",1612.03264v1
+2022-03-24,Supercurrent-enabled Andreev reflection in a chiral quantum Hall edge state,"A chiral quantum Hall (QH) edge state placed in proximity to an s-wave
+superconductor experiences induced superconducting correlations. Recent
+experiments have observed the effect of proximity-coupling in QH edge states
+through signatures of the mediating process of Andreev reflection. We present
+the microscopic theory behind this effect by modeling the system with a
+many-body Hamiltonian, consisting of an s-wave superconductor, subject to
+spin-orbit coupling and a magnetic field, which is coupled by electron
+tunneling to a QH edge state. By integrating out the superconductor we obtain
+an effective pairing Hamiltonian in the QH edge state. We clarify the
+qualitative appearance of nonlocal superconducting correlations in a chiral
+edge state and analytically predict the suppression of electron-hole conversion
+at low energies (Pauli blocking) and negative resistance as experimental
+signatures of Andreev reflection in this setup. In particular, we show how two
+surface phenomena of the superconductor, namely Rashba spin-orbit coupling and
+a supercurrent due to the Meissner effect, are essential for the Andreev
+reflection. Our work provides a promising pathway to the realization of
+Majorana zero-modes and their parafermionic generalizations.",2203.13384v3
+2022-11-10,Spontaneous symmetry breaking of dual-layer solitons in spin-orbit-coupled Bose-Einstein condensates,"It is known that stable 2D solitons of the semi-vortex (SV) and mixed-mode
+(MM) types are maintained by the interplay of the cubic attractive nonlinearity
+and spin-orbit coupling (SOC) in binary Bose-Einstein condensates. We introduce
+a double-layer system, in which two binary condensates, stabilized by the SOC,
+are linearly coupled by tunneling. By means of the numerical methods, it is
+found that symmetric two-layer solitons undergo the
+spontaneous-symmetry-breaking (SSB) bifurcation of the subcritical type. The
+bifurcation produces families of asymmetric 2D solitons, which exist up to the
+value of the total norm equal to the norm of the Townes solitons, above which
+the collapse occurs. This situation terminates at a critical value of the
+inter-layer coupling, beyond which the SSB bifurcation is absent, as the
+collapse sets in earlier. Symmetric 2D solitons that are destabilized by the
+SSB demonstrate dynamical symmetry breaking, in combination with intrinsic
+oscillations of the solitons, or transition to the collapse, if the soliton's
+norm is sufficiently large. Asymmetric MMs produced by the SSB instability
+start spontaneous drift, in addition to the intrinsic vibrations. Consideration
+of moving 2D solitons is a nontrivial problem because SOC breaks the Galilean
+invariance. It is found that the system supports moving MMs up to a critical
+value of the velocity, beyond which they undergo delocalization.",2211.05841v1
+2023-05-03,Transport features of a topological superconducting nanowire with a quantum dot: conductance and noise,"We study two-terminal configurations in junctions between a topological
+superconducting wire with spin-orbit coupling and magnetic field, and an
+ordinary conductor with an embedded quantum dot. One of the signatures of the
+Majorana zero modes in the topological phase is a quantization of the zero-bias
+conductance at $G(V=0)=2e^2/h$. However, the finite size of the wires and the
+presence of the quantum dot in the junction generate more complicated features
+which lead to deviations from this simple picture. Here, we analyze the
+behavior of the conductance at zero and finite bias, $G(V)$, as a function of a
+gate voltage applied at the quantum dot in the case of a finite-length wire. We
+analyze the effect of the angle between the magnetic field and the orientation
+associated to the spin-orbit coupling. We provide a detailed description of the
+spectral features of the quantum wire weakly and also strongly coupled to the
+quantum dot and describe the conditions to have zero-energy states in these two
+regimes for both the topological and non-topological phases. We also analyze
+the concomitant behavior of the noise. We identify qualitative features that
+are useful to distinguish between the topological and non-topological phases.
+We show that in a strongly coupled quantum dot the simultaneous hybridization
+with the topological modes and the supragap states of the wire mask the
+signatures of the Majorana bound states in both the conductance and the Fano
+factor.",2305.02040v2
+2010-06-30,Pseudospin Conserving Shell Model Interactions,"Pseudospin symmetry is approximately conserved in nuclei. Normally shell
+model interactions are written in terms of spin an orbital angular momentum
+operators, not in terms of pseudospin and pseudo-orbital angular momentum
+operators. We determine the shell model interactions which conserve pseudospin
+symmetry and pseudo-orbital angular momentum symmetry and write them in terms
+of spin and orbital angular momentum operators including the tensor
+interaction. We show that, although the tensor interaction by itself does not
+conserve pseudo-orbital angular momentum, certain combinations of the tensor
+interaction with the two body angular momentum squared interaction and the two
+body spin orbit interaction do conserve pseudo-orbital angular momentum.",1006.5954v1
+2017-04-10,Tunable mode coupling in nano-contact spin torque oscillators,"Recent experiments on spin torque oscillators have revealed interactions
+between multiple magnetodynamic modes, including mode-coexistence,
+mode-hopping, and temperature-driven cross-over between modes. Initial
+multimode theory has indicated that a linear coupling between several dominant
+modes, arising from the interaction of the subdynamic system with a magnon
+bath, plays an essential role in the generation of various multimode behaviors,
+such as mode hopping and mode coexistence. In this work, we derive a set of
+rate equations to describe the dynamics of coupled magnetodynamic modes in a
+nano-contact spin torque oscillator. Expressions for both linear and nonlinear
+coupling terms are obtained, which allow us to analyze the dependence of the
+coupled dynamic behaviors of modes on external experimental conditions as well
+as intrinsic magnetic properties. For a minimal two-mode system, we further map
+the energy and phase difference of the two modes onto a two-dimensional phase
+space, and demonstrate in the phase portraits, how the manifolds of periodic
+orbits and fixed points vary with external magnetic field as well as with
+temperature.",1704.03076v2
+2019-06-14,Engineering electron-phonon coupling of quantum defects to a semi-confocal acoustic resonator,"Diamond-based microelectromechanical systems (MEMS) enable direct coupling
+between the quantum states of nitrogen-vacancy (NV) centers and the phonon
+modes of a mechanical resonator. One example, diamond high-overtone bulk
+acoustic resonators (HBARs), feature an integrated piezoelectric transducer and
+support high-quality factor resonance modes into the GHz frequency range. The
+acoustic modes allow mechanical manipulation of deeply embedded NV centers with
+long spin and orbital coherence times. Unfortunately, the spin-phonon coupling
+rate is limited by the large resonator size, $>100~\mu$m, and thus
+strongly-coupled NV electron-phonon interactions remain out of reach in current
+diamond BAR devices. Here, we report the design and fabrication of a
+semi-confocal HBAR (SCHBAR) device on diamond (silicon carbide) with $f\cdot
+Q>10^{12}$($>10^{13}$). The semi-confocal geometry confines the phonon mode
+laterally below 10~$\mu$m. This drastic reduction in modal volume enhances
+defect center electron-phonon coupling. For the native NV centers inside the
+diamond device, we demonstrate mechanically driven spin transitions and show a
+high strain-driving efficiency with a Rabi frequency of
+$(2\pi)2.19(14)$~MHz/V$_{p}$, which is comparable to a typical microwave
+antenna at the same microwave power.",1906.06309v1
+2021-07-26,Symbiotic solitons in a quasi-one- and quasi-two-dimensional spin-1 condensates,"We study the formation of spin-1 symbiotic spinor solitons in a quasi-one-
+(quasi-1D) and quasi-two-dimensional (quasi-2D) hyper-fine spin $F=1$
+ferromagnetic Bose-Einstein condensate (BEC). The symbiotic solitons
+necessarily have a repulsive intraspecies interaction and are bound due to an
+attractive interspecies interaction. Due to a collapse instability in higher
+dimensions, an additional spin-orbit coupling is necessary to stabilize a
+quasi-2D symbiotic spinor soliton. Although a quasi-1D symbiotic soliton has a
+simple Gaussian-type density distribution, novel spatial periodic structure in
+density is found in quasi-2D symbiotic SO-coupled spinor solitons. For a weak
+SO coupling, the quasi-2D solitons are of the $(-1, 0, +1)$ or $(+1, 0, -1)$
+type with intrinsic vorticity and multi-ring structure, for Rashba or
+Dresselhaus SO coupling, respectively, where the numbers in the parentheses are
+angular momenta projections in spin components $F_z = +1, 0, -1$, respectively.
+For a strong SO coupling, stripe and superlattice solitons, respectively, with
+a stripe and square-lattice modulation in density, are found in addition to the
+multi-ring solitons. The stationary states were obtained by imaginary-time
+propagation of a mean-field model; dynamical stability of the solitons was
+established by real-time propagation over a long period of time. The
+possibility of the creation of such a soliton by removing the trap of a
+confined spin-1 BEC in a laboratory is also demonstrated.",2107.12194v2
+2021-12-21,CrSbSe3: a pseudo one-dimensional ferromagnetic semiconductor,"Low-dimensional magnetic materials have attracted much attention due to their
+novel properties and high potential for spintronic applications. In this work,
+we study the electronic structure and magnetic properties of the pseudo
+one-dimensional compound CrSbSe$_3$, using density functional calculations,
+superexchange model analyses, and Monte Carlo simulations. We find that
+CrSbSe$_3$ is a ferromagnetic (FM) semiconductor with a band gap of about 0.65
+eV. The FM couplings within each zig-zag spin chain are due to the Cr-Se-Cr
+superexchange with the near-90$^\circ$ bonds, and the inter-chain FM couplings
+are one order of magnitude weaker. By inclusion of the spin-orbit coupling
+(SOC) effects, our calculations reproduce the experimental observation of the
+easy magnetization $a$ axis and the hard $b$ axis (the spin-chain direction),
+with the calculated moderate magnetic anisotropy of 0.19 meV/Cr. Moreover, we
+identify the nearly equal contributions from the single ion anisotropy of Cr,
+and from the exchange anisotropy due to the strong SOC of the heavy elements Sb
+and Se and their couplings with Cr. Using the parameters of the magnetic
+coupling and anisotropy from the above calculations, our Monte Carlo
+simulations yield the Curie temperature $T_{\rm{C}}$ of 108 K.",2112.10937v1
+2022-09-16,Valley-Spin Hall Effect-based Nonvolatile Memory with Exchange-Coupling-Enabled Electrical Isolation of Read and Write Paths,"Valley-spin hall (VSH) effect in monolayer WSe2 has been shown to exhibit
+highly beneficial features for nonvolatile memory (NVM) design. Key advantages
+of VSH-based magnetic random-access memory (VSH-MRAM) over spin orbit torque
+(SOT)-MRAM include access transistor-less compact bit-cell and low power
+switching of perpendicular magnetic anisotropy (PMA) magnets. Nevertheless,
+large device resistance in the read path (RS) due to low mobility of WSe2 and
+Schottky contacts deteriorates sense margin, offsetting the benefits of
+VSH-MRAM. To address this limitation, we propose another flavor of VSH-based
+MRAM that (while inheriting most of the benefits of VSH-MRAM) achieves lower RS
+in the read path by electrically isolating the read and write terminals. This
+is enabled by coupling VSH with electrically-isolated but magnetically-coupled
+PMA magnets via interlayer exchange-coupling. Designing the proposed devices
+using object oriented micro magnetic framework (OOMMF) simulation, we ensure
+the robustness of the exchange-coupled PMA system under process variations. To
+maintain a compact memory footprint, we share the read access transistor across
+multiple bit-cells. Compared to the existing VSH-MRAMs, our design achieves
+39%-42% and 36%-46% reduction in read time and energy, respectively, along with
+1.1X-1.3X larger sense margin at a comparable area. This comes at the cost of
+1.7X and 2.0X increase in write time and energy, respectively. Thus, the
+proposed design is suitable for applications in which reads are more dominant
+than writes.",2209.08188v1
+2010-06-29,Topological Berry phase and semiclassical quantization of cyclotron orbits for two dimensional electrons in coupled band models,"The semiclassical quantization of cyclotron orbits for two-dimensional Bloch
+electrons in a coupled two band model with a particle-hole symmetric spectrum
+is considered. As concrete examples, we study graphene (both mono and bilayer)
+and boron nitride. The main focus is on wave effects -- such as Berry phase and
+Maslov index -- occurring at order $\hbar$ in the semiclassical quantization
+and producing non-trivial shifts in the resulting Landau levels. Specifically,
+we show that the index shift appearing in the Landau levels is related to a
+topological part of the Berry phase -- which is basically a winding number of
+the direction of the pseudo-spin 1/2 associated to the coupled bands --
+acquired by an electron during a cyclotron orbit and not to the complete Berry
+phase, as commonly stated. As a consequence, the Landau levels of a coupled
+band insulator are shifted as compared to a usual band insulator. We also study
+in detail the Berry curvature in the whole Brillouin zone on a specific example
+(boron nitride) and show that its computation requires care in defining the
+""k-dependent Hamiltonian"" H(k), where k is the Bloch wavevector.",1006.5632v2
+2019-08-01,Giant magnetoelectric coupling in multiferroic PbTi$_{1-x}$V$_x$O$_{3}$ from density functional calculations,"The giant magnetoelectric coupling is a very rare phenomenon which has gained
+a lot of attention for the past few decades because of fundamental interest as
+well as practical applications. Here, we have successfully achieved the giant
+magnetoelectric coupling in PbTi1-xVxO3 (x= 0-1) with the help of a series of
+generalized-gradient-corrected (GGA), GGA including on-site coulomb repulsion
+(U) corrected spin polarized calculations based on accurate density functional
+theory. Our total energy calculations show that PbTi1-xVxO3 stabilizes in
+C-type antiferromagnetic ground state for x>0.123. With the substitution of V
+into PbTiO3, the tetragonal distortion is highly enhanced accompanied by a
+linear increase in polarization. In addition, our band structure analysis shows
+that for lower x values, the tendency to form 2Dmagnetism of PbTi1-xVxO3
+decreases. A non-magnetic metallic ground state is observed for the
+paraelectric phase for V concentration (x) = 1 competing with a volume change
+of 10% showing a large magnetovolume effect. Our orbital projected DOS as well
+as orbital ordering analysis suggest that the orbital ordering plays a major
+role in the magnetic to non-magnetic transition when going from ferroelectric
+to paraelectric phase. The calculated magnetic anisotropic energy shows that
+the direction [110] is the easy axis of magnetization for x= 1 composition. The
+present study adds a new series of compounds to the magnetoelectric family with
+rarely existing giant coupling between electric and magnetic order parameters.
+These results show that such kind of materials can be used for novel practical
+applications where one can change the magnetic properties drastically (magnetic
+to non-magnetic as shown here) with external electric fieldand vice-versa.",1908.00238v1
+2019-08-02,Isoelectronic tuning of heavy fermion systems: Proposal to synthesize Ce3Sb4Pd3,"The study of (quantum) phase transitions in heavy-fermion compounds relies on
+a detailed understanding of the microscopic control parameters that induce
+them. While the influence of external pressure is rather straight forward,
+atomic substitutions are more involved. Nonetheless, replacing an elemental
+constituent of a compound with an isovalent atom is---effects of disorder
+aside---often viewed as merely affecting the lattice constant. Based on this
+picture of chemical pressure, the unit-cell volume is identified as an
+empirical proxy for the Kondo coupling. Here instead, we propose an ""orbital
+scenario"" in which the coupling in complex systems can be tuned by
+isoelectronic substitutions with little or no effect onto cohesive properties.
+Starting with the Kondo insulator Ce$_3$Bi$_4$Pt$_3$, we consider---within
+band-theory---isoelectronic substitutions of the pnictogen (Bi$\rightarrow$Sb)
+and/or the precious metal (Pt$\rightarrow$Pd). We show for the isovolume series
+Ce$_3$Bi$_4$(Pt$_{1-x}$Pd$_x$)$_3$ that the Kondo coupling is in fact
+substantially modified by the different radial extent of the $5d$ (Pt) and $4d$
+(Pd) orbitals, while spin-orbit coupling mediated changes are minute. Combining
+experimental Kondo temperatures with simulated hybridization functions, we also
+predict effective masses $m^*$, finding excellent agreement with many-body
+results for Ce$_3$Bi$_4$Pt$_3$. Our analysis motivates studying the so-far
+unknown Kondo insulator Ce$_3$Sb$_4$Pd$_3$, for which we predict
+$m^*/m_{band}=\mathcal{O}(10)$.",1908.00840v1
+1999-09-02,Orbital Polarization and Fluctuation in Manganese Oxides,"In a form which include the mother compound, we studied the extended
+Hubbard-type model with the orbital degeneracy for any doping concentration.
+Meanfield phase diagram and the spin wave excitation in RPA are calculated. It
+turned out that a large orbital polarization is essential to reproduce the
+magnetic phases depending on the doping concentration. Base on this result, we
+discuss the spin canting, the spin wave dispersion, and spin wave stiffness
+from the standing point of the large orbital polarization. We also discuss the
+orbital fluctuation which turned out to be important in the ferromagnetic
+metallic region where the CMR is observed. Spin wave softening near the zone
+boundary is also discussed in this context.",9909023v1
+2004-02-02,Suppression of Spin-Orbit Scattering in Strong-Disordered Gold Nanojunctions,"We discovered that spin-orbit scattering in strong-disordered gold
+nanojunctions is strongly suppressed relative to that in weak-disordered gold
+thin films. This property is unusual because in weak-disordered films,
+spin-orbit scattering increases with disorder. Granularity and freezing of
+spin-orbit scattering inside the grains explains the suppression of spin-orbit
+scattering. We propose a generalized Elliot-Yafet relation that applies to
+strong-disordered granular regime.",0402054v2
+2005-06-10,Spin-charge-orbital ordering on triangle-based lattices,"We investigate the ground-state property of an e_g-orbital Hubbard model at
+quarter filling on a zigzag chain by exploiting the density matrix
+renormalization group method. When two orbitals are degenerate, the zigzag
+chain is decoupled to a doble-chain spin system to suppress the spin
+frustration due to the spatial anisotropy of the occupied orbital. On the other
+hand, when the level splitting is increased and the orbital anisotropy
+disappears, a characteristic change in the spin incommnsurability is observed
+due to the revival of the spin frustration.",0506242v1
+1998-01-17,Quark Orbital Motion in the Nucleon,"An unified scheme for describing both spin and orbital motion in
+symmetry-breaking chiral quark model is suggested. The analytic results of the
+spin and orbital angular momenta carried by different quark flavors in the
+nucleon are given. The quark spin reduction due to spin-flip in the chiral
+splitting processes is compensated by the increase of the orbital angular
+momentum carried by the quarks and antiquarks. The sum of both spin and orbital
+angular momenta in the nucleon is 1/2, if the gluons and other degrees of
+freedom are neglected. The same conclusion holds for other octet and decuplet
+baryons. Possible modification and application are briefly discussed.",9801332v2
+2008-04-07,Paired Orbitals for Different Spins equations,"Eigenvalue-type equations for Lowdin-Amos-Hall spin-paired (corresponding)
+orbitals are developed to provide an alternative to the standard spin-polarized
+Hartree-Fock or Kohn-Sham equations. Obtained equations are non-canonical
+unrestricted Hartree-Fock-type equations in which non-canonical orbitals are
+fixed to be biorthogonal spin-paired orbitals. To derive paired orbitals for
+different spins (PODS) equations there has been applied Adams-Gilbert
+localizing operator approach. PODS equations are especially useful for
+treatment of the broken-symmetry solutions for antiferromagnetic materials.",0804.0967v1
+2012-06-14,Spin-Orbital Liquid on a Triangular Lattice,"Using Lanczos exact diagonalization of finite clusters we demonstrate that
+the spin-orbital $d^1$ model for triply degenerate $t_{2g}$ orbitals on a
+triangular lattice provides an example of a spin-orbital liquid ground state.
+We also show that the spin-orbital liquid involves entangled valence bond
+states which violate the Goodenough-Kanamori rules, and modify effective spin
+exchange constants.",1206.3216v1
+2009-11-30,Chaotic orbits for spinning particles in Schwarzschild spacetime,"We consider the orbits of particles with spin in the Schwarzschild spacetime.
+Using the Papapetrou-Dixon equations of motion for spinning particles, we solve
+for the orbits and focus on those that exhibit chaos using both Poincar\'e maps
+and Lyapunov exponents. In particular, we develop a method for comparing the
+Lyapunov exponents of chaotic orbits. We find chaotic orbits for smaller spin
+values than previously thought and with spins that could be realized
+astrophysically.",0912.0031v2
+2006-12-13,Spin Flips and Precession in Black-Hole-Binary Mergers,"We use the `moving puncture' approach to perform fully non-linear evolutions
+of spinning quasi-circular black-hole binaries with individual spins not
+aligned with the orbital angular momentum. We evolve configurations with the
+individual spins (parallel and equal in magnitude) pointing in the orbital
+plane and 45-degrees above the orbital plane. We introduce a technique to
+measure the spin direction and track the precession of the spin during the
+merger, as well as measure the spin flip in the remnant horizon. The former
+configuration completes 1.75 orbits before merging, with the spin precessing by
+98-degrees and the final remnant horizon spin flipped by ~72-degrees with
+respect to the component spins. The latter configuration completes 2.25 orbits,
+with the spins precessing by 151-degrees and the final remnant horizon spin
+flipped ~34-degrees with respect to the component spins. These simulations show
+for the first time how the spins are reoriented during the final stage of
+binary black hole mergers verifying the hypothesis of the spin-flip phenomenon.
+We also compute the track of the holes before merger and observe a precession
+of the orbital plane with frequency similar to the orbital frequency and
+amplitude increasing with time.",0612076v4
+2023-06-30,Comparing spin supplementary conditions for particle motion around traversable wormholes,"The Mathisson-Papapetrou-Dixon (MPD) equations describe the motion of
+spinning test particles. It is well-known that these equations, which couple
+the Riemann curvature tensor with the antisymmetric spin tensor S, together
+with the normalization condition for the four-velocity, is a system of eleven
+equations relating fourteen unknowns. To ``close'' the system, it is necessary
+to introduce a constraint of the form V_\mu S^{\mu \nu} = 0, usually known as
+the spin supplementary condition (SSC), where V_\mu is a future-oriented
+reference vector satisfying the normalization condition V_\alpha V^\alpha = -1.
+There are several SSCs in the literature. In particular, the Tulzcyjew-Dixon,
+Mathisson-Pirani, and Ohashi-Kyrian-Semer\'ak are the most used by the
+community. From the physical point of view, choosing a different SSC (a
+different reference vector $V^\mu$) is equivalent to fixing the centroid of the
+test particle. In this manuscript, we compare different SSCs for spinning test
+particles moving around a Morris-Thorne traversable wormhole. To do so, we
+first obtain the orbital frequency and expand it up to third-order in the
+particle's spin; as expected, the zero-order coincides with the Keplerian
+frequency, the same in all SSCs; nevertheless, we found that differences appear
+in the second order of the expansion, similar to the Schwarzschild and Kerr
+black holes. We also compare the behavior of the innermost stable circular
+orbit (ISCO). Since each SSC is associated with a different centroid of the
+test particle, we analyze (separately) the radial and spin corrections for each
+SSC. We found that the radial corrections improve the convergence, especially
+between Tulzcyjew-Dixon and Mathisson-Pirani SSCs. In the case of
+Ohashi-Kyrian-Semer\'ak, we found that the spin corrections remove the
+divergence for the ISCO and extend its existence for higher values of the
+particle's spin.",2306.17394v1
+2013-01-31,Defect states and excitations in a Mott insulator with orbital degrees of freedom: Mott-Hubbard gap versus optical and transport gaps in doped systems,"We address the role played by charged defects in doped Mott insulators with
+active orbital degrees of freedom. It is observed that defects feature a rather
+complex and rich physics, which is well captured by a degenerate Hubbard model
+extended by terms that describe crystal-field splittings and orbital-lattice
+coupling, as well as by terms generated by defects such as the Coulomb
+potential terms that act both on doped holes and on electrons within occupied
+orbitals at undoped sites. We show that the multiplet structure of the excited
+states generated in such systems by strong electron interactions is well
+described within the unrestricted Hartree-Fock approximation, once the symmetry
+breaking caused by the onset of magnetic and orbital order is taken into
+account. Furthermore, we uncover new spectral features that arise within the
+Mott-Hubbard gap and in the multiplet spectrum at high energies due to the
+presence of defect states and strong correlations. These features reflect the
+action on electrons/holes of the generalized defect potential that affects
+charge and orbital degrees of freedom, and indirectly also spin ones. The
+present study elucidates the mechanism behind the Coulomb gap appearing in the
+band of defect states and investigates the dependence on the electron-electron
+interactions and the screening by the orbital polarization field. As an
+illustrative example of our general approach, we present explicit calculations
+for the model describing three t_2g orbital flavors in the perovskite vanadates
+doped by divalent Sr or Ca ions, such as in La_(1-x)Sr_xVO_3 and
+Y_(1-x)Ca_xVO_3 systems. We analyze the orbital densities at vanadium ions in
+the vicinity of defects, and the excited defect states which determine the
+optical and transport gaps in doped systems.",1302.0020v2
+2012-12-31,Fulde-Ferrell-Larkin-Ovchinnikov Phases in Two-dimensional Spin-Orbit Coupled Degenerate Fermi Gases,"The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase, a superconducting state
+with non-zero total momentum Cooper pairs in a strong magnetic field, was
+predicted more than 50 years ago and now becomes an important concept in many
+branches of physics. However, no unambiguous experimental evidences for the
+existence of FFLO phases have been observed yet. Recently, spin-imbalanced
+ultracold degenerate Fermi gases have emerged as a new powerful platform for
+the observation of FFLO phases due to their high experimental controllability
+and the lack of disorder. However, in three dimensional degenerate Fermi gases
+where the FFLO phases can be described within the simple mean field theory, the
+parameter region for the FFLO phases is too small to be observed in
+experiments. Recently, we showed that the Rashba type spin-orbit coupling and
+in-plane Zeeman field in three dimensional degenerate Fermi gases provide a
+more efficient way to create the FFLO phase because (1) the parameter region
+for the FFLO phase is greatly enlarged in the phase diagram and (2) the FFLO
+phase is stabilized due to the enhanced energy difference between FFLO phase
+and conventional Bardeen-Cooper-Schrieffer (BCS) phase. In this work we
+investigate the FFLO phase in two dimensional spin-orbit coupled degenerate
+Fermi gases using the mean field theory, with special concerns on the physical
+origin of the FFLO state. The basic properties of the FFLO phase are discussed
+and the phase diagram is obtained at zero temperature. The symmetry of
+different quantum phases is examined, which provide important basis for the
+experimental observation of FFLO phases using the time-of-flight imaging.",1212.6826v2
+2018-10-31,Novel Strongly Spin-Orbit Coupled Quantum Dimer Magnet: Yb$_2$Si$_2$O$_7$,"The quantum dimer magnet (QDM) is the canonical example of quantum magnetism.
+The QDM state consists of entangled nearest-neighbor spin dimers and often
+exhibits a field-induced triplon Bose-Einstein condensate (BEC) phase. We
+report on a new QDM in the strongly spin-orbit coupled, distorted
+honeycomb-lattice material Yb$_2$Si$_2$O$_7$. Our single crystal neutron
+scattering, specific heat, and ultrasound velocity measurements reveal a gapped
+singlet ground state at zero field with sharp, dispersive excitations. We find
+a field-induced magnetically ordered phase reminiscent of a BEC phase, with
+exceptionally low critical fields of $H_{c1} \sim 0.4$ T and $H_{c2} \sim 1.4$
+T. Using inelastic neutron scattering in an applied magnetic field we observe a
+Goldstone mode (gapless to within $\delta E$ = 0.037 meV) that persists
+throughout the entire field-induced magnetically ordered phase, suggestive of
+the spontaneous breaking of U(1) symmetry expected for a triplon BEC. However,
+in contrast to other well-known cases of this phase, the high-field
+($\mu$$_0$$H\geq1.2$T) part of the phase diagram in Yb$_2$Si$_2$O$_7$ is
+interrupted by an unusual regime signaled by a change in the field dependence
+of the ultrasound velocity and magnetization, as well as the disappearance of a
+sharp anomaly in the specific heat. These measurements raise the question of
+how anisotropy in strongly spin-orbit coupled materials modifies the field
+induced phases of QDMs.",1810.13096v2
+2022-05-06,Strong Effects of Interlayer Interaction on Valence-Band Splitting in Transition Metal Dichalcogenides,"Understanding the origin of valence band maxima (VBM) splitting in transition
+metal dichalcogenides (TMDs) is important because it governs the unique spin
+and valley physics in monolayer and multilayer TMDs. In this work, we present
+our systematic study of VBM splitting ($\Delta$) in atomically thin MoS$_2$ and
+WS$_2$ by employing photocurrent spectroscopy as we change the temperature and
+the layer numbers. We found that VBM splitting in monolayer MoS$_2$ and WS$_2$
+depends strongly on temperature, which contradicts the theory that spin-orbit
+coupling solely determines the VBM splitting in monolayer TMDs. We also found
+that the rate of change of VBM splitting with respect to temperature
+($m=\frac{\partial\Delta}{\partial T}$) is the highest for monolayer (-0.14
+meV/K for MoS$_2$) and the rate decreases as the layer number increases ($m ~
+0$ meV/K for 5 layers MoS$_2$). We performed density functional theory (DFT)
+and the GW with Bethe-Salpeter Equation (GW-BSE) calculations to determine the
+electronic band structure and optical absorption for a bilayer MoS$_2$ with
+different interlayer separations. Our simulations agree with the experimental
+observations and demonstrate that the temperature dependence of VBM splitting
+in atomically thin monolayer and multilayer TMDs originates from the changes in
+the interlayer coupling strength between the neighboring layers. By studying
+two different types of TMDs and many different layer thicknesses, we also
+demonstrate that VBM splitting also depends on the layer numbers and type of
+transition metals. Our study will help understand the role spin-orbit coupling
+and interlayer interaction play in determining the VBM splitting in quantum
+materials and develop next-generation devices based on spin-orbit interactions.",2205.03449v2
+2023-04-14,Emergent SU(8) Dirac semimetal and novel proximate phases of spin-orbit coupled fermions on a honeycomb lattice,"Emergent Dirac fermions provide the starting point to understanding the
+plethora of novel condensed matter phases. The nature of the associated phases
+and phase transitions crucially depends on both the emergent symmetries as well
+as the implementation of the microscopic ones on the low-energy Dirac fermions.
+Here, we show that $j=3/2$ electrons in spin-orbit coupled materials on
+honeycomb lattice can give rise to SU(8) symmetric Dirac semimetals with
+symmetry implementation very different from that of graphene. This non-trivial
+embedding of the microscopic symmetries in the low energy is reflected in the
+nature of phases proximate to the Dirac semimetal. Such phases can arise from
+finite short-range electron-electron interactions. In particular, we identify
+24 such phases - divided into three classes - and their low energy properties
+obtained by condensing particle-number conserving fermion bilinears that break
+very different microscopic symmetries and/or are topologically protected by
+symmetries. The latter includes interesting generalisations of quantum
+spin-Hall phases. Remarkably some of the resultant phases still support a
+sub-set of gapless fermions - protected by a sub-group of SU(8) - resulting in
+interesting density wave semimetals. Near the phase transitions to such density
+wave semimetals, the surviving gapless fermions strongly interact with the
+bosonic order parameter field and give rise to novel quantum critical points.
+Our study is applicable to a wide class of $d^1$ and $d^3$ transition metals
+with strong spin-orbit coupling and predicts that such materials can harbour a
+very rich interplay of symmetries and competing interactions in the
+intermediate correlation regime.",2304.07223v2
+2023-10-23,Complete zero-energy flat bands of surface states in fully gapped chiral noncentrosymmetric superconductors,"Noncentrosymmetric superconductors can support flat bands of zero-energy
+surface states in part of their surface Brillouin zone. This requires that they
+obey time-reversal symmetry and have a sufficiently strong
+triplet-to-singlet-pairing ratio to exhibit nodal lines in the bulk. These
+bands are protected by a winding number that relies on chiral symmetry, which
+is realized as the product of time-reversal and particle-hole symmetry. We
+reveal a way to stabilize a flat band in the entire surface Brillouin zone,
+while the bulk dispersion is fully gapped. This idea could lead to a robust
+platform for quantum computation and represents an alternative route to
+strongly correlated flat bands in two dimensions, besides twisted bilayer
+graphene. The necessary ingredient is an additional spin-rotation symmetry that
+forces the direction of the spin-orbit-coupling vector not to depend on the
+momentum component normal to the surface. We define a winding number that leads
+to flat zero-energy surface bands due to bulk-boundary correspondence. We
+discuss under which conditions this winding number is nonzero in the entire
+surface Brillouin zone and verify the occurrence of zero-energy surface states
+by exact numerical diagonalization of the Bogoliubov-de Gennes Hamiltonian for
+a slab. In addition, we consider how a weak breaking of the additional symmetry
+affects the surface band, employing first-order perturbation theory and a
+quasiclassical approximation. We find that the surface states and the bulk gap
+persist for weak breaking of the additional symmetry but that the band does not
+remain perfectly flat. The broadening of the band strongly depends on the
+deviation of the spin-orbit-coupling vector from its unperturbed direction as
+well as on the spin-orbit-coupling strength and the triplet-pairing amplitude.",2310.14800v2
+2006-01-17,Fingerprints of spin-orbital physics in cubic Mott insulators: Magnetic exchange interactions and optical spectral weights,"The temperature dependence and anisotropy of optical spectral weights
+associated with different multiplet transitions is determined by the spin and
+orbital correlations. To provide a systematic basis to exploit this close
+relationship between magnetism and optical spectra, we present and analyze the
+spin-orbital superexchange models for a series of representative
+orbital-degenerate transition metal oxides with different multiplet structure.
+For each case we derive the magnetic exchange constants, which determine the
+spin wave dispersions, as well as the partial optical sum rules. The magnetic
+and optical properties of early transition metal oxides with degenerate
+$t_{2g}$ orbitals (titanates and vanadates with perovskite structure) are shown
+to depend only on two parameters, viz. the superexchange energy $J$ and the
+ratio $\eta$ of Hund's exchange to the intraorbital Coulomb interaction, and on
+the actual orbital state. In $e_g$ systems important corrections follow from
+charge transfer excitations, and we show that KCuF$_3$ can be classified as a
+charge transfer insulator, while LaMnO$_3$ is a Mott insulator with moderate
+charge transfer contributions. In some cases orbital fluctuations are quenched
+and decoupling of spin and orbital degrees of freedom with static orbital order
+gives satisfactory results for the optical weights. On the example of cubic
+vanadates we describe a case where the full quantum spin-orbital physics must
+be considered. Thus information on optical excitations, their energies,
+temperature dependence and anisotropy, combined with the results of magnetic
+neutron scattering experiments, provides an important consistency test of the
+spin-orbital models, and indicates whether orbital and/or spin fluctuations are
+important in a given compound.",0601381v1
+2018-09-10,Lattice distortion in the spin-orbital entangled state in RVO3 perovskites,"We report a thorough study of Y$_{0.7}$La$_{0.3}$VO$_3$ single crystals by
+measuring magnetic properties, specific heat, thermal conductivity, x-ray and
+neutron diffraction with the motivation of revealing the lattice response to
+the spin-orbital entanglement in \textit{R}VO$_3$. Upon cooling from room
+temperature, the orbitally disordered paramagnetic state changes around
+T*$\sim$220\,K to spin-orbital entangled state which is then followed by a
+transition at T$_N$=116\,K to C-type orbital ordered (OO) and G-type
+antiferromagnetic ordered (AF) ground state. In the temperature interval
+T$_N<T<T^*$, the VO$_{6/2}$ octahedra have two comparable in-plane V-O bonds
+which are longer than the out-of-plane V-O1 bond. This local structural
+distortion supports the spin-orbital entanglement of partially filled and
+degenerate yz/zx orbitals. However, this distortion is incompatible with the
+steric octahedral site distortion intrinsic to orthorhombic perovskites. Their
+competition induces a second order transition from the spin-orbital entangled
+state to C-OO/G-AF ground state where the long range OO suppresses the
+spin-orbital entanglement. Our analysis suggests that the spin-orbital
+entangled state and G-OO are comparable in energy and compete with each other.
+Rare earth site disorder favors the spin-orbital entanglement rather than a
+cooperative Jahn-Teller distortion. The results also indicate for LaVO$_3$ a
+C-OO/G-AF state in T$_t$\,$\leq$\,T\,$\leq$T$_N$ and an orbital flipping
+transition at T$_t$.",1809.03360v1
+2005-04-03,Microscopic Approach to Magnetism and Superconductivity of $f$-Electron Systems with Filled Skutterudite Structure,"In order to gain a deep insight into $f$-electron properties of filled
+skutterudite compounds from a microscopic viewpoint, we investigate the
+multiorbital Anderson model including Coulomb interactions, spin-orbit
+coupling, and crystalline electric field effect. For each case of
+$n$=1$\sim$13, where $n$ is the number of $f$ electrons per rare-earth ion, the
+model is analyzed by using the numerical renormalization group (NRG) method to
+evaluate magnetic susceptibility and entropy of $f$ electron. In order to make
+further step to construct a simplified model which can be treated even in a
+periodic system, we also analyze the Anderson model constructed based on the
+$j$-$j$ coupling scheme by using the NRG method. Then, we construct an orbital
+degenerate Hubbard model based on the $j$-$j$ coupling scheme to investigate
+the mechanism of superconductivity of filled skutterudites. In the 2-site
+model, we carefully evaluate the superconducting pair susceptibility for the
+case of $n$=2 and find that the susceptibility for off-site Cooper pair is
+clearly enhanced only in a transition region in which the singlet and triplet
+ground states are interchanged.",0504052v1
+2006-06-22,Quantum phases of correlated electrons in artificial molecules under magnetic fields,"We investigate the stability of few-electron quantum phases in vertically
+coupled quantum dots under a magnetic field of arbitrary strength and
+direction. The orbital and spin stability diagrams of realistic devices
+containing up to five electrons, from strong to weak inter-dot coupling, is
+determined. Correlation effects and realistic sample geometries are fully taken
+into account within the Full Configuration Interaction method. In general, the
+magnetic field drives the system into a strongly correlated regime by
+modulating the single-particle gaps. In coupled quantum dots different
+components of the field, either parallel or perpendicular to the tunneling
+direction, affect single-dot orbitals and tunneling energy, respectively.
+Therefore, the stability of the quantum phases is related to different
+correlation mechanisms, depending on the field direction. Comparison of exact
+diagonalization results with simple models allows to identify the specific role
+of correlations.",0606582v1
+2008-10-23,Quantum Optomechanics with Single Atom,"The recently increasing explorations for cavity optomechanical coupling
+assisted by a single atom or an atomic ensemble have opened an experimentally
+accessible fashion to interface quantum optics and nano (micro) -mechanical
+systems. In this paper, we study in details such composite quantum dynamics of
+photon, phonon and atoms, specified by the triple coupling, which only exists
+in this triple hybrid system: The cavity QED system with a movable end mirror.
+We exactly diagonalize the Hamiltonian of the triple hybrid system under the
+parametric resonance condition. We find that, with the rotating-wave
+approximation, the hybrid system is modeled by a generalized spin-orbit
+coupling where the orbital angular momentum operator is defined through a
+Jordan-Schwinger realization with two bosonic modes, corresponding to the
+mirror oscillation and the single mode photon of the cavity. In the
+quasi-classical limit of very large angular momentum, this system will behave
+like a standard cavity-QED system described by the Jaynes-Cummings model as the
+angular momentum operators are transformed to bosonic operators of a single
+mode. We test this observation with an experimentally accessible system with
+the atom in the cavity with a moving mirror.",0810.4206v1
+2010-04-13,Coupled frustrated quantum spin-1/2 chains with orbital order in volborthite Cu3V2O7(OH)2(H2O)2,"We present a microscopic magnetic model for the spin-liquid candidate
+volborthite Cu3V2O7(OH)2(H2O)2. The essentials of this DFT-based model are (i)
+the orbital ordering of Cu(1) 3d 3z2-r2 and Cu(2) 3d 3x2-y2, (ii) three
+relevant couplings J_ic, J_1 and J_2, (iii) the ferromagnetic nature of J_1 and
+(iv) frustration governed by the next-nearest-neighbor exchange interaction
+J_2. Our model implies magnetism of frustrated coupled chains in contrast to
+the previously proposed anisotropic kagome model. Exact diagonalization studies
+reveal agreement with experiments.",1004.2185v2
+2010-06-16,Intervalley coupling for interface-bound electrons in silicon: An effective mass study,"Orbital degeneracy of the electronic conduction band edge in silicon is a
+potential roadblock to the storage and manipulation of quantum information
+involving the electronic spin degree of freedom in this host material. This
+difficulty may be mitigated near an interface between Si and a barrier
+material, where intervalley scattering may couple states in the conduction
+ground state, leading to nondegenerate orbital ground and first excited states.
+The level splitting is experimentally found to have a strong sample dependence,
+varying by orders of magnitude for different interfaces and samples. The basic
+physical mechanisms leading to such coupling in different systems are
+addressed. We expand our recent study based on an effective mass approach,
+incorporating the full plane-wave expansions of the Bloch functions at the
+conduction band minima. Physical insights emerge naturally from a simple
+Si/barrier model. In particular, we present a clear comparison between ours and
+different approximations and formalisms adopted in the literature and establish
+the applicability of these approximations in different physical scenarios.",1006.3338v2
+2015-02-26,Orbital Kondo effect in fractional quantum Hall systems,"We study transport properties of a charge qubit coupling two chiral Luttinger
+liquids, realized by two antidots placed between the edges of an integer
+$\nu=1$ or fractional $\nu=1/3$ quantum Hall bar. We show that in the limit of
+a large capacitive coupling between the antidots, their quasiparticle occupancy
+behaves as a pseudo-spin corresponding to an orbital Kondo impurity coupled to
+a chiral Luttinger liquid, while the inter antidot tunnelling acts as an
+impurity magnetic field. The latter tends to destabilize the Kondo fixed point
+for the $\nu=1/3$ fractional Hall state, producing an effective inter-edge
+tunnelling. We relate the inter-edge conductance to the susceptibility of the
+Kondo impurity and calculate it analytically in various limits for both $\nu=1$
+and $\nu=1/3$.",1502.07430v1
+2018-04-24,Pseudocontact shifts and paramagnetic susceptibility in semiempirical and quantum chemistry theories,"Pseudocontact shifts are traditionally described as a function of the
+anisotropy of the paramagnetic susceptibility tensor, according to the
+semiempirical theory mainly developed by Kurland and McGarvey (R.J. Kurland and
+B.R. McGarvey, J. Magn. Reson. 2, 286 (1970)). The paramagnetic susceptibility
+tensor is required to be symmetric. Applying point-dipole approximation to the
+quantum chemistry theory of hyperfine shift, pseudocontact shifts are found to
+scale with a non-symmetric tensor that differs by a factor g/ge from the
+paramagnetic susceptibility tensor derived within the semiempirical framework.
+We analyze the foundations of the Kurland-McGarvey pseudocontact shift
+expression and recall that it is inherently based on the Russell-Saunders (LS)
+coupling approximation for the spin-orbit coupling. We show that the difference
+between the semiempirical and quantum chemistry pseudocontact shift expressions
+arises directly from the different treatment of the orbital contribution to the
+hyperfine coupling.",1804.09055v2
+2009-12-14,Local breaking of the spin-orbit interaction: the microscopic origin of exchange bias in Co/FeMn,"Modern magnetic thin film devices owe their success in large part to effects
+emerging from interlayer coupling and exchange interaction at interfaces. A
+prominent example is exchange bias (EB), a magnetic coupling phenomenon found
+in ferromagnet (F)/antiferromagnet (AF) systems. Uncompensated pinned moments
+in the AF couple to the F via the interface causing an additional
+unidirectional anisotropy. As a result, the hysteresis of the F is shifted. The
+existence of such pinned moments is nowadays accepted although their physical
+nature and origin is still unknown. Here we present a thorough spectroscopic
+investigation based on X-ray magnetic circular dichroism which does for the
+first time provide direct information about the physics of pinned magnetic
+moments. Our data clearly shows that the orbital magnetic moment, which is
+usually widely quenched in transition metal systems, is the driving force
+behind exchange bias in Co/FeMn.",0912.2353v1
+2020-10-21,Symmetry breaking and phase transitions in Bose-Einstein condensates with spin-orbital-angular-momentum coupling,"Theoretical study is presented for a spinor Bose-Einstein condensate, whose
+two components are coupled by copropagating Raman beams with different orbital
+angular momenta. The investigation is focused on the behavior of the ground
+state of this condensate, depending on the atom-light coupling strength. By
+analyzing the ground state, we have identified a number of quantum phases,
+which reflect the symmetries of the effective Hamiltonian and are characterized
+by the specific structure of the wave function. In addition to the well-known
+stripe, polarized and zero-momentum phases, our results show that the system
+can support phases, whose wave function contains a complex vortex molecule.
+Such molecule plays an important role in the continuous phase transitions of
+the system. The predicted behavior of vortex-molecule phases can be examined in
+cold-atom experiments using currently existing techniques.",2010.10965v1
+2017-07-12,Effective Interactions in a Graphene Layer Induced by the Proximity to a Ferromagnet,"The proximity-induced couplings in graphene due to the vicinity of a
+ferromagnetic insulator are analyzed. We combine general symmetry principles
+and simple tight-binding descriptions to consider different orientations of the
+magnetization. We find that, in addition to a simple exchange field, a number
+of other terms arise. Some of these terms act as magnetic orbital couplings,
+and others are proximity-induced spin-orbit interactions. The couplings are of
+similar order of magnitude, and depend on the orientation of the magnetization.
+A variety of phases, and anomalous Hall effect regimes, are possible.",1707.03868v1
+2020-03-13,Broken symmetry $G_0W_0$ approach for the evaluation of exchange coupling constants,"The applicability of a broken symmetry version of the $G_0W_0$ approximation
+to the calculation of isotropic exchange coupling constants has been studied.
+Using a simple H--He--H model system the results show a significant and
+consistent improvement of the results over both broken symmetry Hartree--Fock
+and broken symmetry density functional theory. In the case of more realistic
+bimetallic Cu(II) complexes, inclusion of the $G_0W_0$ correction does not lead
+to obvious improvement in the results. The discrepancies are explained by
+improved description of the interactions within the magnetic orbital space upon
+inclusion of the $G_0W_0$ corrections but deterioration of the description of
+charge- and spin-polarization effects outside the magnetic orbital space.
+Overall the results show that computational methods based on the $GW$ method
+have a potential to improve computational estimates of exchange coupling
+constants.",2003.06334v1
+2022-10-17,Microscopic study of orbital textures,"Many interesting spin and orbital transport phenomena originate from orbital
+textures, referring to $\vec{k}$-dependent orbital states. Most of previous
+works are based on symmetry analysis to model the orbital texture and analyze
+its consequences. However the microscopic origins of orbital texture and its
+strength are largely unexplored. In this work, we derive the orbital texture
+Hamiltonians from microscopic tight-binding models for various situations. To
+form an orbital texture, $\vec{k}$-dependent hybridization of orbital states
+are necessary. We reveal two microscopic mechanisms for the hybridization: (i)
+lattice structure effect and (ii) mediation by other orbital states. By
+considering the orbital hybridization, we not only reproduce the orbital
+Hamiltonian obtained by the symmetry analysis but also reveal previously
+unreported orbital textures like orbital Dresselhaus texture and anisotropic
+orbital texture. The orbital Hamiltonians obtained here would be useful for
+analyzing the orbital physics and designing the materials suitable for
+spin-orbitronic applications. We show that our theory also provides useful
+microscopic insight into physical phenomena such as the orbital Rashba effect
+and the orbital Hall effect. Our formalism is so generalizable that one can
+apply it to obtain effective orbital Hamiltonians for arbitrary orbitals in the
+presence of periodic lattice structures.",2210.08876v1
+2021-06-21,Resonant Measurement of Non-Reorientable Spin-Orbit Torque from a Ferromagnetic Source Layer Accounting for Dynamic Spin Pumping,"Using a multilayer structure containing (cobalt detector layer)/(copper
+spacer)/(Permalloy source layer), we show experimentally how the
+non-reorientable spin-orbit torque generated by the Permalloy source layer (the
+component of spin-orbit torque that does not change when the Permalloy
+magnetization is rotated) can be measured using spin-torque ferromagnetic
+resonance (ST-FMR) with lineshape analysis. We find that dynamic spin pumping
+between the magnetic layers exerts torques on the magnetic layers as large or
+larger than the spin-orbit torques, so that if dynamic spin pumping is
+neglected the result would be a large overestimate of the spin-orbit torque.
+Nevertheless, the two effects can be separated by performing ST-FMR as a
+function of frequency. We measure a non-reorientable spin torque ratio
+$\xi_{\text{Py}} = 0.04 \pm 0.01$ for spin current flow from Permalloy through
+an 8 nm Cu spacer to the Co, and a strength of dynamic spin pumping that is
+consistent with previous measurements by conventional ferromagnetic resonance.",2106.11127v1
+2015-06-09,Theory of the spin-galvanic effect and the anomalous phase-shift $\varphi_{0}$ in superconductors and Josephson junctions with intrinsic spin-orbit coupling,"Due to the spin-orbit coupling (SOC) an electric current flowing in a normal
+metal or semiconductor can induce a bulk magnetic moment. This effect is known
+as the Edelstein (EE) or magneto-electric effect. Similarly, in a bulk
+superconductor a phase gradient may create a finite spin density. The inverse
+effect, also known as the spin-galvanic effect, corresponds to the creation of
+a supercurrent by an equilibrium spin polarization. Here, by exploiting the
+analogy between a linear-in-momentum SOC and a background SU(2) gauge field, we
+develop a quasiclassical transport theory to deal with magneto-electric effects
+in superconducting structures. For bulk superconductors this approach allows us
+to easily reproduce and generalize a number of previously known results. For
+Josephson junctions we establish a direct connection between the inverse EE and
+the appearance of an anomalous phase-shift $\varphi_{0}$ in the current-phase
+relation. In particular we show that $\varphi_{0}$ is proportional to the
+equilibrium spin-current in the weak link. We also argue that our results are
+valid generically, beyond the particular case of linear-in-momentum SOC. The
+magneto-electric effects discussed in this study may find applications in the
+emerging field of coherent spintronics with superconductors.",1506.02977v3
+2016-06-06,Origin and magnitude of 'designer' spin-orbit interaction in graphene on semiconducting transition metal dichalcogenides,"We use a combination of experimental techniques to demonstrate a general
+occurrence of spin-orbit interaction (SOI) in graphene on transition metal
+dichalcogenide (TMD) substrates. Our measurements indicate that SOI is
+ultra-strong and extremely robust, despite it being merely
+interfacially-induced, with neither graphene nor the TMD substrates changing
+their structure. This is found to be the case irrespective of the TMD material
+used, of the transport regime, of the carrier type in the graphene band, and of
+the thickness of the graphene multilayer. Specifically, we perform weak
+antilocalization measurements as the simplest and most general diagnostic of
+SOI, and show that the spin relaxation time is very short in all cases
+regardless of the elastic scattering time. Such a short spin-relaxation time
+strongly suggests that the SOI originates from a modification of graphene band
+structure. We confirmed this expectation by measuring a gate-dependent beating,
+and a corresponding frequency splitting, in the low-field Shubnikov-de Haas
+magneto-resistance oscillations in high quality bilayer graphene on WSe$_2$.
+These measurements provide an unambiguous diagnostic of a SOI-induced splitting
+in the electronic band structure, and their analysis allows us to determine the
+SOI coupling constants for the Rashba term and the so-called spin-valley
+coupling term, i.e., the terms that were recently predicted theoretically for
+interface-induced SOI in graphene. The magnitude of the SOI splitting is found
+to be on the order of 10 meV, more than 100 times greater than the SOI
+intrinsic to graphene. Both the band character of the interfacially induced
+SOI, as well as its robustness and large magnitude make graphene-on-TMD a
+promising system to realize and explore a variety of spin-dependent transport
+phenomena, such as, in particular, spin-Hall and valley-Hall topological
+insulating states.",1606.01789v1
+2018-04-19,Phenomenological Three-Orbital Spin-Fermion Model for Cuprates,"A spin-fermion model that captures the charge-transfer properties of Cu-based
+high critical temperature superconductors is introduced and studied via Monte
+Carlo simulations. The strong Coulomb repulsion among $d$-electrons in the Cu
+orbitals is phenomenologically replaced by an exchange coupling between the
+spins of the itinerant electrons and localized spins at the Cu sites, formally
+similar to double-exchange models for manganites. This interaction induces a
+charge-transfer insulator gap in the undoped case (five electrons per unit
+cell). Adding a small antiferromagnetic Heisenberg coupling between localized
+spins reinforces the global tendency towards antiferromagnetic order. To
+perform numerical calculations the localized spins are considered classical, as
+in previous related efforts. In this first study, undoped and doped $8\times 8$
+clusters are analyzed in a wide range of temperatures. The numerical results
+reproduce experimental features in the one-particle spectral function and the
+density-of-states such as $(i)$ the formation of a Zhang-Rice-like band with a
+dispersion of order $\sim 0.5$ eV and with rotational symmetry about wavevector
+$(\pi/2,\pi/2)$ at the top of the band, and $(ii)$ the opening of a pseudogap
+at the chemical potential upon doping. We also observed incipient tendencies
+towards spin incommensurability. This simple model offers a formalism
+intermediate between standard mean-field approximations, that fail at finite
+temperatures in regimes with short-range order, and sophisticated many-body
+techniques such as Quantum Monte Carlo, that suffer sign problems.",1804.07191v1
+2018-05-18,Hamiltonian formulation of general relativity and post-Newtonian dynamics of compact binaries,"Hamiltonian formalisms provide powerful tools for the computation of
+approximate analytic solutions of the Einstein field equations. The
+post-Newtonian computations of the explicit analytic dynamics and motion of
+compact binaries are discussed within the most often applied
+Arnowitt-Deser-Misner formalism. The obtention of autonomous Hamiltonians is
+achieved by the transition to Routhians. Order reduction of higher derivative
+Hamiltonians results in standard Hamiltonians. Tetrad representation of general
+relativity is introduced for the tackling of compact binaries with spinning
+components. Configurations are treated where the absolute values of the spin
+vectors can be considered constant. Compact objects are modeled by use of Dirac
+delta functions and their derivatives. Consistency is achieved through
+transition to d-dimensional space and application of dimensional
+regularization. At the fourth post-Newtonian level, tail contributions to the
+binding energy show up. The conservative spin-dependent dynamics finds explicit
+presentation in Hamiltonian form through next-to-next-to-leading-order
+spin-orbit and spin1-spin2 couplings and to leading-order in the cubic and
+quartic in spin interactions. The radiation reaction dynamics is presented
+explicitly through the third-and-half post-Newtonian order for spinless
+objects, and, for spinning bodies, to leading-order in the spin-orbit and
+spin1-spin2 couplings. The most important historical issues get pointed out.",1805.07240v4
+2021-12-29,High-harmonic generation in spin and charge current pumping at ferromagnetic or antiferromagnetic resonance in the presence of spin-orbit coupling,"One of the cornerstone effects in spintronics is spin pumping by dynamical
+magnetization that is steadily precessing (around, e.g., the $z$-axis) with
+frequency $\omega_0$, due to absorption of low-power microwaves of frequency
+$\omega_0$ under the resonance conditions and in the absence of any applied
+bias voltage. The two-decades-old ""standard model"" of this effect, based on the
+scattering theory of adiabatic quantum pumping, predicts that component
+$I^{S_z}$ of spin current vector $\big( I^{S_x}(t),I^{S_y}(t),I^{S_z} \big)
+\propto \omega_0$ is time-independent while $I^{S_x}(t)$ and $I^{S_y}(t)$
+oscillate harmonically in time with a single frequency $\omega_0$; whereas
+pumped charge current is zero $I \equiv 0$ in the same adiabatic $\propto
+\omega_0$ limit. Here we employ more general than ""standard model"" approaches,
+time-dependent nonequilibrium Green's function (NEGF) and Floquet-NEGF, to
+predict unforeseen features of spin pumping -- precessing localized magnetic
+moments within ferromagnetic metal (FM) or antiferromagnetic metal (AFM), whose
+conduction electrons are exposed to spin-orbit coupling (SOC) of either
+intrinsic or proximity origin, will pump both spin $I^{S_\alpha}(t)$ and charge
+$I(t)$ currents. All four of these functions harmonically oscillate in time at
+both even an odd integer multiples $N\omega_0$ of the driving frequency
+$\omega_0$. The cutoff order of such high-harmonics increases with SOC
+strength, reaching $N_\mathrm{max} \simeq 11$ in the chosen-for-demonstration
+one-dimensional FM or AFM models. Higher cutoff $N_\mathrm{max} \simeq 25$ can
+be achieved in realistic two-dimensional (2D) FM models defined on the
+honeycomb lattice, where we provide prescription on how to realize them using
+2D magnets and their heterostructures.",2112.14685v3
+2023-02-08,Tunable correlation effects of magnetic impurities by the cubic Rashba spin-orbit couplings,"We theoretically study the influence of the $k$-cubic Rashba spin-orbit
+coupling (SOC) on the correlation effects of magnetic impurities by combining
+the variational method and the Hirsch-Fye quantum Monte Carlo (HFQMC)
+simulations. Markedly different from the normal $k$-linear Rashba SOC, even a
+small cubic Rashba term can greatly alter the band structure and induce a Van
+Hove singularity in a wide range of energy, thus the single impurity local
+moment becomes largely tunable. The cubic Rashba SOC adopted in this work
+breaks the rotational symmetry, but the host material is still invariant under
+the operations $\mathcal{R}^z(\pi)$, $\mathcal{IR}^z(\pi/2)$,
+$\mathcal{M}_{xz}$, $\mathcal{M}_{yz}$, where $\mathcal{R}^z(\theta)$ is the
+rotation of angle $\theta$ about the $z$-axis, $\mathcal{I}$ is the inversion
+operator and $\mathcal{M}_{xz}$ ($\mathcal{M}_{yz}$) is the mirror reflection
+about the $x$-$z$ ($y$-$z$) principal plane. Saliently, various components of
+spin-spin correlation between the single magnetic impurity and the conduction
+electrons show three- or six-fold rotational symmetry. This unique feature is
+due to the triple winding of the spins with a $2\pi$ rotation of $\mathbf{k}$,
+which is a hallmark of the cubic Rashba effect and can possibly be an
+identifier to distinguish the cubic Rashba SOC from the normal $k$-linear
+Rashba term in experiments. Although the cubic Rashba term drastically alters
+the electronic properties of the host, we find that the spatial decay rate of
+the spin-spin correlation function remains essentially unchanged. Moreover, the
+carrier-mediated Ruderman-Kittel-Kasuya-Yosida interactions between two
+magnetic impurities show twisted features, the ferromagnetic diagonal terms
+dominate when two magnetic impurities are very close, but the off-diagonal
+terms become important at long distances.",2302.03993v2
+2024-03-23,Bilinear magnetoresistance in 2DEG with isotropic cubic Rashba spin-orbit interaction,"Bilinear magnetoresistance has been studied theoretically in 2D systems with
+isotropic cubic form of Rashba spin-orbit interaction. We have derived the
+effective spin-orbital field due to current-induced spin polarization and
+discussed its contribution to the unidirectional system response. The analysed
+model can be applied to the semiconductor quantum wells as well as 2DEG at the
+surfaces and interfaces of perovskite oxides.",2403.15817v1
+2022-01-05,Equatorial orbits of spinning test particle in rotating boson star,"In this paper, we study the circular orbit of the spinning test particle in
+the background of a rotating boson star. Using the pole-dipole approximation
+and neglecting the back-reaction of the spinning test particle on the
+spacetime, the equation of motion of the spinning test particle is described by
+the Mathisson-Papapetrou-Dixon equation. We solve this equation under the
+Tulczyjew spin-supplementary condition and obtain the four-momentum and
+four-velocity of the spinning test particle. Quite different from the spinless
+particle, the effective potential of the spinning particle with zero orbital
+angular momentum goes to infinite at the center of the rotating boson star.
+This will lead to the fact that the spinning particle can not pass through the
+center of the boson star. However, when the spin angular momentum and orbital
+angular momentum satisfy $2\bar{s}+\bar{l}=0$, the effective potential is not
+divergent anymore and the spinning particle can pass through the center of the
+rotating boson star. {We still investigate how the spin affects the structure
+of the circular orbits and we find that the spin will induce the larger or
+smaller regions of no circular orbits, unstable circular orbits, and stable
+circular orbits.} Moreover, the radius and energy of the circular orbit will be
+decreased or increased by the particle spin. These results will have an
+important application in testing the gravitational waves in the boson star
+background.",2201.01498v3
+2022-01-31,Tuning spin-orbit torques across the phase transition in VO$_2$/NiFe heterostructure,"The emergence of spin-orbit torques as a promising approach to
+energy-efficient magnetic switching has generated large interest in material
+systems with easily and fully tunable spin-orbit torques. Here, current-induced
+spin-orbit torques in VO$_2$/NiFe heterostructures were investigated using
+spin-torque ferromagnetic resonance, where the VO$_2$ layer undergoes a
+prominent insulator-metal transition. A roughly two-fold increase in the
+Gilbert damping parameter, $\alpha$, with temperature was attributed to the
+change in the VO$_2$/NiFe interface spin absorption across the VO$_2$ phase
+transition. More remarkably, a large modulation ($\pm$100%) and a sign change
+of the current-induced spin-orbit torque across the VO$_2$ phase transition
+suggest two competing spin-orbit torque generating mechanisms. The bulk spin
+Hall effect in metallic VO$_2$, corroborated by our first-principles
+calculation of spin Hall conductivity, $\sigma_{SH} \approx 10^4
+\frac{\hbar}{e} \Omega^{-1} m^{-1}$, is verified as the main source of the
+spin-orbit torque in the metallic phase. The self-induced/anomalous torque in
+NiFe, of the opposite sign and a similar magnitude to the bulk spin Hall effect
+in metallic VO$_2$, could be the other competing mechanism that dominates as
+temperature decreases. For applications, the strong tunability of the torque
+strength and direction opens a new route to tailor spin-orbit torques of
+materials which undergo phase transitions for new device functionalities.",2201.12984v1
+2010-03-13,Single-shot readout of an electron spin in silicon,"The size of silicon transistors used in microelectronic devices is shrinking
+to the level where quantum effects become important. While this presents a
+significant challenge for the further scaling of microprocessors, it provides
+the potential for radical innovations in the form of spin-based quantum
+computers and spintronic devices. An electron spin in Si can represent a
+well-isolated quantum bit with long coherence times because of the weak
+spin-orbit coupling and the possibility to eliminate nuclear spins from the
+bulk crystal. However, the control of single electrons in Si has proved
+challenging, and has so far hindered the observation and manipulation of a
+single spin. Here we report the first demonstration of single-shot,
+time-resolved readout of an electron spin in Si. This has been performed in a
+device consisting of implanted phosphorus donors coupled to a
+metal-oxide-semiconductor single-electron transistor - compatible with current
+microelectronic technology. We observed a spin lifetime approaching 1 second at
+magnetic fields below 2 T, and achieved spin readout fidelity better than 90%.
+High-fidelity single-shot spin readout in Si opens the path to the development
+of a new generation of quantum computing and spintronic devices, built using
+the most important material in the semiconductor industry.",1003.2679v3
+2015-09-07,Tidal Love numbers of a slowly spinning neutron star,"By extending our recent framework to describe the tidal deformations of a
+spinning compact object, we compute for the first time the tidal Love numbers
+of a spinning neutron star to linear order in the angular momentum. The spin of
+the object introduces couplings between electric and magnetic distortions and
+new classes of spin-induced (""rotational"") tidal Love numbers emerge. We focus
+on stationary tidal fields, which induce axisymmetric perturbations. We present
+the perturbation equations for both electric-led and magnetic-led rotational
+Love numbers for generic multipoles and explicitly solve them for various
+tabulated equations of state and for a tidal field with an electric (even
+parity) and magnetic (odd parity) component with $\ell=2,3,4$. For a binary
+system close to the merger, various components of the tidal field become
+relevant. In this case we find that an octupolar magnetic tidal field can
+significantly modify the mass quadrupole moment of a neutron star. Preliminary
+estimates, assuming a spin parameter $\chi\approx0.05$, show modifications
+$\gtrsim10\%$ relative to the static case, at an orbital distance of five
+stellar radii. Furthermore, the rotational Love numbers as functions of the
+moment of inertia are much more sensitive to the equation of state than in the
+static case, where approximate universal relations at the percent level exist.
+For a neutron-star binary approaching the merger, we estimate that the
+approximate universality of the induced mass quadrupole moment deteriorates
+from $1\%$ in the static case to roughly $6\%$ when $\chi\approx0.05$. Our
+results suggest that spin-tidal couplings can introduce important corrections
+to the gravitational waveforms of spinning neutron-star binaries approaching
+the merger.",1509.02171v3
+2022-05-05,Parity Violation in Spin-Precessing Binaries: Gravitational Waves from the Inspiral of Black Holes in Dynamical Chern-Simons Gravity,"Spin precession in compact binaries is intricately tuned to the multipole
+structure of the underlying bodies. For black holes, violations of the no-hair
+theorems induced by modifications to general relativity correct the precession
+dynamics, which in turn imprints onto the amplitude and phase modulations of
+the gravitational waves emitted by the binary. Recently, the spin precession
+equations were derived up to second order in spin for dynamical Chern-Simons
+gravity, a parity violating modified theory of gravity. We here solve these
+equations and construct, for the first time, analytic expressions for the time-
+and frequency-domain gravitational waves emitted in the quasi-circular inspiral
+of spin-precessing black hole binaries in a modified theory of gravity using
+the post-Newtonian approximation. Working within the small coupling
+approximation and using multiple scale analysis, we show that the corrections
+to the nutation phase enter at relative 1PN order, and the corrections to the
+precession angle and Thomas phase enter at relative 0PN order. Making use of
+the stationary phase approximation and shifted uniform asymptotics, we find
+that the Fourier phase of the waveform is characterized by three modifications,
+two due to the back-reaction of the precession dynamics onto the spin-orbit and
+spin-spin couplings that enter at 1.5PN and 2PN orders, and a 2PN modification
+due to the emission of dipole radiation. We also find that back-reaction of the
+precession dynamics forces the dCS corrections to the Fourier amplitude to
+enter at 0PN order, as opposed to 2PN order, as expected for spin-aligned
+binaries. Our work lays the first foundational stones to build an
+inspiral-merger-ringdown phenomenological model for spin-precessing binaries in
+a modified theory of gravity.",2205.02675v2
+2000-03-10,Light-Cone Representation of the Spin and Orbital Angular Momentum of Relativistic Composite Systems,"The matrix elements of local operators such as the electromagnetic current,
+the energy momentum tensor, angular momentum, and the moments of structure
+functions have exact representations in terms of light-cone Fock state
+wavefunctions of bound states such as hadrons. We illustrate all of these
+properties by giving explicit light-cone wavefunctions for the two-particle
+Fock state of the electron in QED, thus connecting the Schwinger anomalous
+magnetic moment to the spin and orbital momentum carried by its Fock state
+constituents. We also compute the QED one-loop radiative corrections for the
+form factors for the graviton coupling to the electron and photon. Although the
+underlying model is derived from elementary QED perturbative couplings, it in
+fact can be used to simulate much more general bound state systems by applying
+spectral integration over the constituent masses while preserving all of the
+Lorentz properties, giving explicit realization of the spin sum rules and other
+local matrix elements. The role of orbital angular momentum in understanding
+the ""spin crisis"" problem for relativistic systems is clarified. We also prove
+that the anomalous gravitomagnetic moment B(0) vanishes for any composite
+system. This property is shown to follow directly from the Lorentz boost
+properties of the light-cone Fock representation and holds separately for each
+Fock state component. We show how the QED perturbative structure can be used to
+model bound state systems while preserving all Lorentz properties. We thus
+obtain a theoretical laboratory to test the consistency of formulae which have
+been proposed to probe the spin structure of hadrons.",0003082v3
+2021-04-23,Roadmap of spin-orbit torques,"Spin-orbit torque (SOT) is an emerging technology that enables the efficient
+manipulation of spintronic devices. The initial processes of interest in SOTs
+involved electric fields, spin-orbit coupling, conduction electron spins and
+magnetization. More recently interest has grown to include a variety of other
+processes that include phonons, magnons, or heat. Over the past decade, many
+materials have been explored to achieve a larger SOT efficiency. Recently,
+holistic design to maximize the performance of SOT devices has extended
+material research from a nonmagnetic layer to a magnetic layer. The rapid
+development of SOT has spurred a variety of SOT-based applications. In this
+Roadmap paper, we first review the theories of SOTs by introducing the various
+mechanisms thought to generate or control SOTs, such as the spin Hall effect,
+the Rashba-Edelstein effect, the orbital Hall effect, thermal gradients,
+magnons, and strain effects. Then, we discuss the materials that enable these
+effects, including metals, metallic alloys, topological insulators,
+two-dimensional materials, and complex oxides. We also discuss the important
+roles in SOT devices of different types of magnetic layers. Afterward, we
+discuss device applications utilizing SOTs. We discuss and compare
+three-terminal and two-terminal SOT-magnetoresistive random-access memories
+(MRAMs); we mention various schemes to eliminate the need for an external
+field. We provide technological application considerations for SOT-MRAM and
+give perspectives on SOT-based neuromorphic devices and circuits. In addition
+to SOT-MRAM, we present SOT-based spintronic terahertz generators,
+nano-oscillators, and domain wall and skyrmion racetrack memories. This paper
+aims to achieve a comprehensive review of SOT theory, materials, and
+applications, guiding future SOT development in both the academic and
+industrial sectors.",2104.11459v2
+2022-06-02,"Fully relativistic $GW$/Bethe-Salpeter calculations in BerkeleyGW: implementation, symmetries, benchmarking, and performance","Computing the $GW$ quasiparticle bandstructure and Bethe-Salpeter Equation
+(BSE) absorption spectra for materials with spin-orbit coupling has commonly
+been done by treating $GW$ corrections and spin-orbit coupling as separate
+perturbations to density-functional theory. However, accurate treatment of
+materials with strong spin-orbit coupling often requires a fully relativistic
+approach using spinor wavefunctions in the Kohn-Sham equation and $GW$/BSE.
+Such calculations have only recently become available, in particular for the
+BSE. We have implemented this approach in the plane-wave pseudopotential
+$GW$/BSE code BerkeleyGW, which is highly parallelized and widely used in the
+electronic-structure community. We present reference results for quasiparticle
+bandstructures and optical absorption spectra of solids with different
+strengths of spin-orbit coupling, including Si, Ge, GaAs, GaSb, CdSe, Au, and
+Bi$_2$Se$_3$. The calculated quasiparticle band gaps of these systems are found
+to agree with experiment to within a few tens of meV. The absorption spectrum
+of GaSb calculated with the fully-relativistic $GW$-BSE captures the large
+spin-orbit splitting of peaks in the spectrum. For Bi$_2$Se$_3$, we find a
+drastic change in the low-energy bandstructure compared to that of DFT, with
+the fully-relativistic treatment of the $GW$ approximation correctly capturing
+the parabolic nature of the valence and conduction bands after including
+off-diagonal self-energy matrix elements. We present the detailed methodology,
+approach to spatial symmetries for spinors, comparison against other codes, and
+performance compared to spinless $GW$/BSE calculations and perturbative
+approaches to SOC. This work aims to spur further development of spinor
+$GW$/BSE methodology in excited-state research software.",2206.00808v1
+2005-10-31,Intrinsic spin current for an arbitrary Hamiltonian and scattering potential,"We have described electron spin dynamics in the presence of the spin-orbit
+interaction and disorder using the spin-density matrix method. Exact solution
+is obtained for an arbitrary 2D spin-orbit Hamiltonian and arbitrary smoothness
+of the disorder potential. Spin current depends explicitely on the disorder
+properties, namely the smoothness of the disorder potential, even in the
+ballistic limit when broadening by scattering is much smaller than the
+spin-orbit related splitting of the energy spectrum. In this sense universal
+intrinsic spin current does not exist.",0510815v2
+2008-05-08,Spin current diode based on an electron waveguide with spin-orbit interaction,"We propose a spin current diode which can work even in a small applied bias
+condition (the linear-response regime). The prototypal device consists of a
+hornlike electron waveguide with Rashba spin-orbit interaction, which is
+connected to two leads with different widths. It is demonstrated that when
+electrons are incident from the narrow lead, the generated spin conductance
+fluctuates around a constant value in a wide range of incident energy. When the
+transport direction is reversed, the spin conductance is suppressed strongly.
+Such a remarkable difference arises from spin-flipped transitions caused by the
+spin-orbit interaction.",0805.1106v1
+2014-01-23,Tidal evolution of the spin-orbit angle in exoplanetary systems,"The angle between the stellar spin and the planetary orbit axes (spin-orbit
+angle) is supposed to carry valuable information on the initial condition of
+the planet formation and the subsequent migration history. Indeed current
+observations of the Rossiter- McLaughlin effect have revealed a wide range of
+spin-orbit misalignments for transiting exoplanets. We examine in detail the
+tidal evolution of a simple system comprising a Sun-like star and a hot Jupiter
+adopting the equilibrium tide and the inertial wave dissipation effects
+simultaneously. We find that the combined tidal model works as a very efficient
+realignment mechanism; it predicts three distinct states of the spin-orbit
+angle (i.e., parallel, polar, and anti-parallel orbits) for a while, but the
+latter two states eventually approach the parallel spin-orbit configuration.
+The intermediate spin-orbit angles as measured in recent observations are
+difficult to be achieved. Therefore the current model cannot reproduce the
+observed broad distribution of the spin-orbit angles, at least in its simple
+form. This indicates that the observed diversity of the spin-orbit angles may
+emerge from more complicated interactions with outer planets and/or may be the
+consequence of the primordial misalignment between the proto-planetary disk and
+the stellar spin, which requires future detailed studies.",1401.5876v1
+2014-04-22,Conservation of the spin and orbital angular momenta in electromagnetism,"We review and re-examine the description and separation of the spin and
+orbital angular momenta (AM) of an electromagnetic field in free space. While
+the spin and orbital AM of light are not separately-meaningful physical
+quantities in orthodox quantum mechanics or classical field theory, these
+quantities are routinely measured and used for applications in optics. A
+meaningful quantum description of the spin and orbital AM of light was recently
+provided by several authors, which describes separately conserved and
+measurable integral values of these quantities. However, the electromagnetic
+field theory still lacks corresponding locally-conserved spin and orbital AM
+currents. In this paper, we construct these missing spin and orbital AM
+densities and fluxes that satisfy the proper continuity equations. We show that
+these are physically measurable and conserved quantities. These are, however,
+not Lorentz-covariant, so only make sense in the single laboratory reference
+frame of the measurement probe. The fluxes we derive improve the canonical
+(non-conserved) spin and orbital AM fluxes, and include a `spin-orbit' term
+that describes the spin-orbit interaction effects observed in nonparaxial
+optical fields. We also consider both standard and dual-symmetric versions of
+the electromagnetic field theory. Applying the general theory to nonparaxial
+optical vortex beams validates our results and allows us to discriminate
+between earlier approaches to the problem. Our treatment yields the complete
+and consistent description of the spin and orbital AM of free Maxwell fields in
+both quantum-mechanical and field-theory approaches.",1404.5486v3
+2016-09-02,Spin-resolved orbital magnetization in Rashba two-dimensional electron gas,"We calculate orbital spin-dependent magnetization in a two-dimensional
+electron gas with spin-orbit interaction of Rashba type. Such an orbital
+magnetization is admitted by the time-reversal symmetry of the system, and
+gives rise to spin currents when the system is not in thermal equilibrium. The
+theoretical approach is based on the linear response theory and the Matsubara
+Green's function formalism. To account for the spin-resolved orbital
+magnetization a spin-dependent vector potential has been introduced. The spin
+currents which appear in thermal nonequilibrium due to the spin-resolved
+orbital magnetization play an important role in the spin Nernst effect, and
+have to be included in order to correctly describe the low-temperature spin
+Nernst conductivity.",1609.00470v1
+2018-03-19,Enhanced spin-orbit torque via interface engineering in Pt/CoFeB/MgO heterostructures,"Spin-orbit torque facilitates efficient magnetization switching via an
+in-plane current in perpendicularly magnetized heavy metal/ferromagnet
+heterostructures. The efficiency of spin-orbit-torque-induced switching is
+determined by the charge-to-spin conversion arising from either bulk or
+interfacial spin-orbit interactions, or both. Here, we demonstrate that the
+spin-orbit torque and the resultant switching efficiency in Pt/CoFeB systems
+are significantly enhanced by an interfacial modification involving Ti
+insertion between the Pt and CoFeB layers. Spin pumping and X-ray magnetic
+circular dichroism experiments reveal that this enhancement is due to an
+additional interface-generated spin current of the nonmagnetic interface and/or
+improved spin transparency achieved by suppressing the proximity-induced moment
+in the Pt layer. Our results demonstrate that interface engineering affords an
+effective approach to improve spin-orbit torque and thereby magnetization
+switching efficiency.",1803.06961v1
+2014-04-28,Self-consistent linear response for the spin-orbit interaction related properties,"In many cases, the relativistic spin-orbit (SO) interaction is regarded to be
+small and can be treated using perturbation theory. The major obstacle on this
+route comes from the fact that the SO interaction can also polarize the
+electron system and produce additional contributions to the perturbation
+theory, arising from the electron-electron interactions. In electronic
+structure calculations, it may even lead to necessity to abandon the
+perturbation theory and return to the self-consistently solution of
+Kohn-Sham-like equations with the effective potential $\hat{v}$, incorporating
+the effects of the electron-electron interactions and the SO coupling, even
+though the latter is small. In this work, we present the theory of
+self-consistent linear response (SCLR), which allows us to get rid of numerical
+self-consistency and formulate it analytically in the first order of the SO
+coupling. This strategy is applied to the Hartree-Fock solution of the
+effective Hubbard model, derived from electronic structure calculations in the
+Wannier basis. By using $\hat{v}$, obtained from SCLR, one can successfully
+reproduce results of ordinary calculations for the orbital magnetization and
+other properties in the first order of the SO coupling. Particularly, SCLR
+appears to be extremely useful for calculations of antisymmetric
+Dzyaloshinskii-Moriya (DM) interactions based on the magnetic force theorem.
+Furthermore, due to the powerful 2n+1 theorem, the SCLR theory allows us to
+calculate the magnetic anisotropy energy up to the third order of the SO
+coupling. The fruitfulness of this approach is illustrated on a number of
+example, including the spin canting in YTiO$_3$ and LaMnO$_3$, formation of
+spiral magnetic order in BiFeO$_3$, and the magnetic inversion symmetry
+breaking in BiMnO$_3$, which gives rise to both ferroelectric activity and DM
+interactions, responsible for the ferromagnetism.",1404.6872v1
+2014-12-08,Non-local effect of a varying in space Zeeman field on the supercurrent and helix state in a spin-orbit-coupled s-wave superconductor,"A weak parallel Zeeman field combined with the spin-orbit coupling can induce
+the supercurrent in an s-wave two-dimensional superconductor. At the same time,
+the thermodynamically equilibrium state of such a system is characterized by
+the helix phase where the order parameter varies in space as
+$\exp(i\mathbf{Qr})$. In this state the electric current that is induced by the
+Zeeman interaction is exactly counterbalanced by the current produced by the
+gradient of the order-parameter. We studied the interplay of the helix state
+and magnetoelectric current in the case of a varying in space Zeeman field, as
+it might be realized in hybrid heterostructures with magnetic and
+superconducting layers. The theoretical analysis was based on Usadel equations
+for Green functions in a dirty superconductor. It is shown that even a weak
+inhomogeneity produces a strong long-range effect on the magnetoelectric
+current and the order-parameter phase. Consequently, depending on the
+macroscopic shape of such an inhomogeneity, either the helix state with the
+zero supercurrent, or a locally uniform state with the finite supercurrent are
+realized. A mixture of these two extreme situations is also possible. It is
+also shown that the current can be induced at a large distance from a
+ferromagnetic island embedded into a superconductor. Quantum effects associated
+with the magnetoelectric effect are briefly discussed for multiply connected
+systems. The theory proposes a new point of view on interplay of the
+magnetoelectric effect and helix phase in spin-orbit coupled superconductors.
+It also suggests an interesting method allowing to couple superconducting and
+magnetic circuits.",1412.2527v5
+2017-06-21,Two-dimensional solitons and quantum droplets supported by competing self- and cross-interactions in spin-orbit-coupled condensates,"We study two-dimensional (2D) matter-wave solitons in spinor Bose-Einstein
+condensates (BECs) under the action of the spin-orbit coupling (SOC) and
+opposite signs of the self- and cross-interactions. Stable 2D two-component
+solitons of the mixed-mode (MM) type are found if the cross-interaction between
+the components is attractive, while the self-interaction is repulsive in each
+component. Stable solitons of the semi-vortex type are formed in the opposite
+case, under the action of competing self-attraction and cross-repulsion. The
+solitons exist with the total norm taking values below a collapse threshold.
+Further, in the case of the repulsive self-interaction and inter-component
+attraction, stable 2D self-trapped modes, which may be considered as quantum
+droplets (QDs), are created if the beyond-mean-field Lee-Huang-Yang (LHY) terms
+are added to the self-repulsion in the underlying system of coupled
+Gross-Pitaevskii equations. Stable QDs of the MM type, of a large size with an
+anisotropic density profile, exist with arbitrarily large values of the norm,
+as the LHY terms eliminate the collapse. The effect of the SOC term on
+characteristics of the QDs is systematically studied. We also address the
+existence and stability of QDs in the case of SOC with mixed Rashba and
+Dresselhaus terms, which makes the density profile of the QD more isotropic.
+Thus, QDs in the spin-orbit-coupled binary BEC are for the first time studied
+in the present work.",1706.06725v3
+2021-07-02,Interplay between singlet and triplet pairings in multi-band two-dimensional oxide superconductors,"We theoretically study the superconducting properties of multi-band
+two-dimensional transition metal oxide superconductors by analyzing not only
+the role played by conventional singlet pairings, but also by the triplet order
+parameters, favored by the spin-orbit couplings present in these ma- terials.
+In particular, we focus on the two-dimensional electron gas at the (001)
+interface between LaAlO3 and SrTiO3 band insulators where the low electron
+densities and the sizeable spin-orbit couplings affect the superconducting
+features. Our theoretical study is based on an extended su- perconducting
+mean-field analysis of the typical multi-band tight-binding Hamiltonian, as
+well as on a parallel analysis of the effective electronic bands in the
+low-momentum limit, including static on-site and inter-site intra-band
+attractive potentials under applied magnetic fields. The presence of triplet
+pairings is able to strongly reduce the singlet order parameters which, as a
+result, are no longer a monotonic function of the charge density. The interplay
+between the singlet and the triplet pairings affects the dispersion of
+quasi-particle excitations in the Brillouin zone and also induces anisotropy in
+the superconducting behavior under the action of an in-plane and of an out-
+of-plane magnetic fields. Finally, non-trivial topological superconducting
+states become stable as a function of the charge density, as well as of the
+magnitude and of the orientation of the magnetic field. In addition to the
+chiral, time-reversal breaking, topological superconducting phase, favored by
+the linear Rashba couplings and by the on-site attractive potentials in the
+presence of an out- of-plane magnetic field, we find that a time-reversal
+invariant topological helical superconducting phase is promoted by not-linear
+spin-orbit couplings and by the inter-site attractive interactions in the
+absence of magnetic field.",2107.01100v2
+2014-09-11,Anisotropic magnetoresistance in antiferromagnetic Sr2IrO4,"We report point-contact measurements of anisotropic magnetoresistance (AMR)
+in a single crystal of antiferromagnetic (AFM) Mott insulator Sr2IrO4. The
+point-contact technique is used here as a local probe of magnetotransport
+properties on the nanoscale. The measurements at liquid nitrogen temperature
+revealed negative magnetoresistances (MRs) (up to 28%) for modest magnetic
+fields (250 mT) applied within the IrO2 a-b plane and electric currents flowing
+perpendicular to the plane. The angular dependence of MR shows a crossover from
+four-fold to two-fold symmetry in response to an increasing magnetic field with
+angular variations in resistance from 1-14%. We tentatively attribute the
+four-fold symmetry to the crystalline component of AMR and the field-induced
+transition to the effects of applied field on the canting of AFM-coupled
+moments in Sr2IrO4. The observed AMR is very large compared to the crystalline
+AMRs in 3d transition metal alloys/oxides (0.1-0.5%) and can be associated with
+the large spin-orbit interactions in this 5d oxide while the transition
+provides evidence of correlations between electronic transport, magnetic order
+and orbital states. The finding of this work opens an entirely new avenue to
+not only gain a new insight into physics associated with spin-orbit coupling
+but also better harness the power of spintronics in a more technically
+favorable fashion.",1409.3491v2
+2015-10-09,Enhanced and Tunable Spin-Orbit Coupling in Tetragonally Strained Fe-Co-B Films,"We have synthesized 20 nm thick films of tetragonally strained interstitial
+Fe-Co-B alloys epitaxially grown on Au55Cu45 buffer layer. The strained axis is
+perpendicular to the film plane and the corresponding lattice constant c is
+enlarged with respect to the in-plane lattice parameter a. By adding the
+interstitial boron with different concentrations 0, 4, and 10 at.% we were able
+to stabilize the tetragonal strain in 20 nm Fe-Co films with different c/a
+ratios of 1.013, 1.034 and 1.02, respectively. Using ferromagnetic resonance
+(FMR) and x-ray magnetic circular dichroism (XMCD) we found that the orbital
+magnetic moment increases with increasing the c/a ratio, pointing towards the
+enhancement of spin-orbit coupling (SOC) at larger strain. Our results show
+that careful doping of ferromagnetic films allows to control the SOC by
+stabilizing anisotropic strain states. These findings are applicable in
+material design for spintronics applications. We also discuss the influence of
+B doping on the Fe-Co film microstructure, its magnetic properties and magnetic
+relaxation.",1510.02624v1
+2020-02-04,Topological flat bands in frustrated kagome lattice CoSn,"Electronic flat bands in momentum space, arising from strong localization of
+electrons in real space, are an ideal stage to realize strong correlation
+phenomena. In certain lattices with built-in geometrical frustration,
+electronic confinement and flat bands can naturally arise from the destructive
+interference of electronic hopping pathways. Such lattice-borne flat bands are
+often endowed with nontrivial topology if combined with spin-orbit coupling,
+while their experimental realization in condensed matter system has been
+elusive so far. Here, we report the direct observation of topological flat
+bands in the vicinity of the Fermi level in frustrated kagome system CoSn,
+using angle-resolved photoemission spectroscopy and band structure
+calculations. The flat band manifests itself as a dispersionless electronic
+excitation along the G-M high symmetry direction, with an order of magnitude
+lower bandwidth (below 150 meV) compared to the Dirac bands originating from
+the same orbitals. The frustration-driven nature of the flat band is directly
+confirmed by the real-space chiral d-orbital texture of the corresponding
+effective Wannier wave functions. Spin-orbit coupling opens a large gap of 80
+meV at the quadratic band touching point between the Dirac and flat bands,
+endowing a nonzero Z2 topological invariant to the flat band in the
+two-dimensional Brillouin zone. Our observation of lattice-driven topological
+flat band opens a promising route to engineer novel emergent phases of matter
+at the crossroad between strong correlation physics and electronic topology.",2002.01452v1
+2019-08-20,Wavelength-scale errors in optical localization due to spin-orbit coupling of light,"The precise determination of the position of point-like emitters and
+scatterers using far-field optical imaging techniques is of utmost importance
+for a wide range of applications in medicine, biology, astronomy, and physics.
+Although the optical wavelength sets a fundamental limit to the image
+resolution of unknown objects, the position of an individual emitter can in
+principle be estimated from the image with arbitrary precision. This is used,
+e.g., in stars' position determination and in optical super-resolution
+microscopy. Furthermore, precise position determination is an experimental
+prerequisite for the manipulation and measurement of individual quantum
+systems, such as atoms, ions, and solid state-based quantum emitters. Here we
+demonstrate that spin-orbit coupling of light in the emission of elliptically
+polarized emitters can lead to systematic, wavelength-scale errors in the
+estimate of the emitter's position. Imaging a single trapped atom as well as a
+single sub-wavelength-diameter gold nanoparticle, we demonstrate a shift
+between the emitters' measured and actual positions which is comparable to the
+optical wavelength. Remarkably, for certain settings, the expected shift can
+become arbitrarily large. Beyond their relevance for optical imaging
+techniques, our findings apply to the localization of objects using any type of
+wave that carries orbital angular momentum relative to the emitter's position
+with a component orthogonal to the direction of observation.",1908.07268v1
+2019-12-18,The Phenomenon of Shape Evolution due to Solar Driven Outgassing for Analogues of Small Kuiper Belt Objects,"One of the key findings of the Rosetta's mission to the Jupiter family comet
+67P/Churyumov-Gerasimenko was its peculiar bilobed shape along with the
+apparent north/south dichotomy in large scale morphology. This has re-ignited
+scientific discussions on the topic of origin, evolution and age of the
+nucleus. In this work we set up a general numerical investigation on the role
+of solar driven activity on the overall shape change. Our goal is to isolate
+and study the influence of key parameters for solar driven mass loss, and
+hopefully obtain a classification of the final shapes. We consider five general
+classes of three-dimensional (3D) objects for various initial conditions of
+spin-axis and orbital parameters, propagating them on different orbits
+accounting for solar driven CO ice sublimation. A detailed study of the
+coupling between sublimation curve and orbital parameters (for CO and H$_{2}$O
+ices) is also provided. The idealizations used in this study are aimed to
+remove the ad-hoc assumptions on activity source distribution, composition,
+and/or chemical inhomogeneities as applied in similar studies focusing on
+explaining a particular feature or observation. Our numerical experiments show
+that under no condition a homogeneous nucleus with solar driven outgassing can
+produce concave morphology on a convex shape. On the other hand, preexisting
+concavities can hardly be smoothed/removed for the assumed activity. In
+summary, the coupling between solar distance, eccentricity, spin-axis and its
+orientation, as well as effects on shadowing and self-heating do combine to
+induce morphology changes that might not be deducible without numerical
+simulations.",1912.08617v1
+2020-10-24,Dynamics of test particles around regular black holes in modified gravity,"In the work, we have presented detailed analyses of the event horizon and
+curvature properties of spacetime around a regular black hole in modified
+gravity so-called regular MOG black hole. The motion of neutral, electrically
+charged and magnetized particles with magnetic dipole moment, in the close
+environment of the regular MOG black hole immersed in an external
+asymptotically uniform magnetic field has been also explored. Through the study
+on the motion of the neutral test particle, we have obtained that the positive
+(negative) values of the MOG parameter mimic the spin of a rotating Kerr black
+hole giving the same values for innermost stable pro-grade (retrograde) orbits
+of the particles in the range of the spin parameter $a/M \in(-0.4125, \
+0.6946)$. The efficiency of energy release from the accretion disk by the
+Novikov-Thorne model has been calculated and shown that the efficiency is
+linearly proportional to the increase of the MOG parameter $\alpha$, and
+exceeds up to 15 \% at the critical limiting value of the MOG parameter
+$\alpha_{\rm cr}$. The study of the charged particles dynamics has shown that
+innermost stable circular orbits (ISCOs) of the particle increases with the
+increase of the MOG parameter, while the increase of cyclotron frequency being
+responsible to the magnetic interaction causes the decrease of the latter.
+Moreover, the dynamics of magnetic dipoles has shown that the increase of the
+MOG and the magnetic coupling parameters lead to an increase of the inner
+radius and the width of the accretion disk consisting of magnetized particles.
+Finally, we have focused on showing the range of values of the magnetic
+coupling parameter causing the orbits to be stable.",2010.12863v1
+2021-09-13,Magnetic anisotropy of the van der Waals ferromagnet Cr$_2$Ge$_2$Te$_6$ studied by angular-dependent XMCD,"The van der Waals ferromagnet Cr$_2$Ge$_2$Te$_6$ (CGT) has a two-dimensional
+crystal structure where each layer is stacked through van der Waals force. We
+have investigated the nature of the ferromagnetism and the weak perpendicular
+magnetic anisotropy (PMA) of CGT by means of X-ray absorption spectroscopy and
+X-ray magnetic circular dichroism (XMCD) studies of CGT single crystals. The
+XMCD spectra at the Cr $L_{2,3}$ edge for different magnetic field directions
+were analyzed on the basis of the cluster-model multiplet calculation. The Cr
+valence is confirmed to be 3+ and the orbital magnetic moment is found to be
+nearly quenched, as expected for the high-spin $t_{2g}$$^3$ configuration of
+the Cr$^{3+}$ ion. A large ($\sim 0.2$ eV) trigonal crystal-field splitting of
+the $t_{2g}$ level caused by the distortion of the CrTe$_6$ octahedron has been
+revealed, while the single-ion anisotropy (SIA) of the Cr atom is found to have
+a sign {\it opposite} to the observed PMA and too weak compared to the reported
+anisotropy energy. The present result suggests that anisotropic exchange
+coupling between the Cr atoms through the ligand Te $5p$ orbitals having strong
+spin-orbit coupling has to be invoked to explain the weak PMA of CGT, as in the
+case of the strong PMA of CrI$_3$.",2109.05715v1
+2022-03-09,"The interplay between structural, magnetic and electronic states in the pyrochlore iridate Eu2Ir2O7","We address the concomitant metal-insulator transition (MIT) and
+antiferromagnetic ordering in the novel pyrochlore iridate Eu2Ir2O7 by
+combining x-ray absorption spectroscopy, x-ray and neutron diffractions and
+density functional theory (DFT) based calculations. The temperature dependent
+powder x-ray diffraction clearly rules out any change in the lattice symmetry
+below the MIT, nevertheless a clear anomaly in the Ir-O-Ir bond angle and Ir-O
+bond length is evident at the onset of MIT. From the x-ray absorption near edge
+structure (XANES) spectroscopic study of Ir-L3 and L2 edges, the effective
+spin-orbit coupling is found to be intermediate, at least quite far from the
+strong atomic spin-orbit coupling limit. Powder neutron diffraction measurement
+is in line with an all-in-all-out magnetic structure of the Ir-tetrahedra in
+this compound, which is quite common among rare-earth pyrochlore iridates. The
+sharp change in the Ir-O-Ir bond angle around the MIT possibly arises from the
+exchange striction mechanism, which favors an enhanced electron correlation via
+weakening of Ir-Ir orbital overlap and an insulating phase below TMI . The
+theoretical calculations indicate an insulating state for shorter bond angle
+validating the experimental observation. Our DFT calculations show a
+possibility of intriguing topological phase below a critical value of the Ir-O
+distance, which is shorter than the experimentally observed bond length.
+Therefore, a topological state may be realized in bulk Eu2Ir2O7 sample if the
+Ir-O bond length can be reduced by the application of sufficient external
+pressure.",2203.04939v1
+2022-03-24,Ab Initio Study of K${_3}$Cu${_3}$P${_2}$ Material for Photovoltaic Applications,"Search for efficient materials for application in the fields of
+optoelectronics and photovoltaics are active areas of research across the
+world. The potential of compounds such as K${_3}$Cu${_3}$P${_2}$ is not yet
+fully realized. Therefore, we perform the ab initio studies based on density
+functional theory to investigate the structural, electronic, elastic, and
+optical properties of K${_3}$Cu${_3}$P${_2}$. Ground state properties were
+computed in three different scenarios, i.e: with spin-orbit coupling (SOC),
+without spin-orbit coupling, and with Hubbard U parameter. Direct electronic
+bandgaps of 1.338 eV, 1.323 eV and 1.673 eV were obtained for
+K${_3}$Cu${_3}$P${_2}$ without SOC, K${_3}$Cu${_3}$P${_2}$ with SOC and
+K${_3}$Cu${_3}$P${_2}$ with Hubbard U respectively. In all the cases, Cu-d
+orbitals were dominant at the top of the valence band. The effect of SOC on the
+K${_3}$Cu${_3}$P${_2}$ computed lattice constant and bandgap was insignificant.
+The mechanical stability test indicated that K${_3}$Cu${_3}$P${_2}$ is
+mechanically stable at zero pressure. The optical band gap was found to
+increase by 0.635 eV when Hubbard U was taken into consideration. Generally,
+the inclusion of the Hubbard U parameter in density functional theory improves
+the predictions of the bandgap and optical properties.",2203.13230v1
+2022-05-18,Gadolinium halide monolayers: a fertile family of two-dimensional 4f magnets,"Two-dimensional (2D) magnets have great potentials for applications in
+next-generation information devices. Since the recent experimental discovery of
+intrinsic 2D magnetism in monolayer CrI$_3$ and few-layer Cr$_2$Ge$_2$Te$_6$,
+intensive studies have been stimulated in pursuing more 2D magnets and
+revealing their intriguing physical properties. In comparison to the magnetism
+based on $3d$ electrons, $4f$ electrons can provide larger magnetic moments and
+stronger spin-orbit coupling, but have been much less studied in the 2D forms.
+Only in very recent years, some exciting results have been obtained in this
+area. In this mini-review, we will introduce some recent progress in 2D Gd
+halides from a theoretical aspect. It is noteworthy that $4f$ and $5d$ orbitals
+of Gd both play key roles in these materials. For Gd$X_2$ ($X$=I, Br, Cl and F)
+monolayers and related Janus monolayers, robust ferromagnetism with large
+exchanges comes from the $4f^7$+$5d^1$ hybridization of Gd$^{2+}$. The
+spatially expanded $5d$ electrons act as a bridge to couple localized $4f$
+spins. For Gd$X_3$ monolayers, the intercalation of metal atoms can dope
+electrons into Gd's $5d$ orbitals, which leads to numerous intriguing physical
+properties, such as ferroelasticity, ferromagnetism, and anisotropic
+conductance. In brief, Gd halides establish an effective strategy to take
+advantage of $f$-electron magnetism in 2D materials.",2205.08666v1
+2022-12-01,"An insight into the properties of ATiO3 (A=Ti,Sr) materials for photovoltaic applications","One of the most active research areas in the world is the search for
+effective materials for use in the fields of optoelectronics and photovoltaics.
+The potential of materials like ATiO3 (A=Ti,Sr) is yet largely untapped. Ab
+initio studies based on density functional theory (DFT) have been used to
+comprehensively explore the structural, electronic, elastic, and optical
+properties of Ti2O3 and SrTiO3. In this study, the ground state properties were
+computed with spin-orbit coupling (SOC), without spin-orbit coupling, and with
+the inclusion of Hubbard U parameter. The electronic bandgaps of Ti2O3 have
+been found to be 0.059 eV without SOC, 0.131 eV with SOC, and 1.665 eV with
+Hubbard U. Electronic bandgaps of 1.612 eV, 1.761 eV, and 2.769 eV have been
+obtained for SrTiO3, respectively, without SOC, with SOC, and with Hubbard U.
+In every single case, it has been found that Ti-4d orbitals predominate close
+to the top of the valence band. The bandgap and estimated lattice constants for
+ATiO3 (A=Ti,Sr) were not significantly affected by SOC. The mechanical
+stability test showed that ATiO3 (A=Ti,Sr) is mechanically stable at zero
+pressure. The optical band gap has been seen to increase when Hubbard U is
+taken into account. In general, the Hubbard U parameter enhances bandgap and
+optical property predictions. Ti2O3 and SrTiO3 are good UV-Vis absorbers and
+appropriate for photovoltaic applications owing to the optical absorption
+coefficient curves being found to cover the ultraviolet to visible (UV-Vis)
+ranges.",2212.00635v1
+2023-05-22,Existence of nodal-arc and its evolution into Weyl-nodes in the presence of spin-orbit coupling in TaAs & TaP,"In this work, we report the existence of nodal-arc, which acts as the
+building block of all the nodal-rings in TaAs & TaP. This nodal-arc is found to
+be capable of generating all the nodal-rings in these materials upon the
+application of space-group symmetry operations including time-reversal
+symmetry. The arcs are obtained to be dispersive with the energy spread of
+$\sim$109 ($\sim$204) meV in TaAs (TaP). Also, the orbitals leading to
+bands-inversion and thus the formation of nodal-arcs are found to be Ta-5d &
+As-4p (P-3p) in TaAs (TaP). The area of nodal-rings is found to be highly
+sensitive to the change in hybridization-strength, where the increase in
+hybridization-strength leads to the decrease in the area of nodal-rings. In the
+presence of spin-orbit coupling (SOC), all the points on these arcs get
+gaped-up and two pairs of Weyl-nodes are found to evolve from them. Out of the
+two pair, one is found to be situated close to the joining point of the two
+arcs forming a ring. This causes the evolution of each nodal-ring into three
+pairs of Weyl-nodes. The coordinates of these Weyl-nodes are found to be robust
+to the increase in SOC-strength from $\sim$ 0.7-3.5 eV. All the results are
+obtained at the first-principle level. This work provides a clear picture of
+the existence of nodal-arc due to accidental degeneracy and its evolution into
+Weyl-nodes under the effect of SOC.",2305.15432v2
+2023-11-15,Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field,"Two-dimensional semiconductor-superconductor heterostructures form the
+foundation of numerous nanoscale physical systems. However, measuring the
+properties of such heterostructures, and characterizing the semiconductor
+in-situ is challenging. A recent experimental study [arXiv:2107.03695] was able
+to probe the semiconductor within the heterostructure using microwave
+measurements of the superfluid density. This work revealed a rapid depletion of
+superfluid density in semiconductor, caused by the in-plane magnetic field
+which in presence of spin-orbit coupling creates so-called Bogoliubov Fermi
+surfaces. The experimental work used a simplified theoretical model that
+neglected the presence of non-magnetic disorder in the semiconductor, hence
+describing the data only qualitatively. Motivated by experiments, we introduce
+a theoretical model describing a disordered semiconductor with strong
+spin-orbit coupling that is proximitized by a superconductor. Our model
+provides specific predictions for the density of states and superfluid density.
+Presence of disorder leads to the emergence of a gapless superconducting phase,
+that may be viewed as a manifestation of Bogoliubov Fermi surface. When applied
+to real experimental data, our model showcases excellent quantitative
+agreement, enabling the extraction of material parameters such as mean free
+path and mobility, and estimating $g$-tensor after taking into account the
+orbital contribution of magnetic field. Our model can be used to probe in-situ
+parameters of other superconductor-semiconductor heterostructures and can be
+further extended to give access to transport properties.",2311.09347v2
+2011-02-10,Strain effects on ferroelectric polarization and magnetism in orthorhombic HoMnO3,"Aiming at increasing the ferroelectric polarization in AFM-E ortho-\hmo, we
+investigate the in-plane strain effects on both the magnetic configuration and
+the polarization by means of density functional theory calculations and model
+Hamiltonian approaches. Our results show that the net polarization is largely
+enhanced under compressive strain, due to an increase of the electronic
+contribution to the polarization, whereas the ionic contribution is found to
+decrease. We identify the electron-lattice coupling, due to Jahn-Teller (JT)
+distortions, and its response to strain to be responsible for the observed
+behavior. The JT-induced orbital ordering of occupied Mn-e$_g^1$ electrons in
+alternating $3x^2-r^2/3y^2-r^2$ orbital states at equilibrium changes to a
+mixture with $x^2-z^2/y^2-z^2$ states under in-plane compressive strain. The
+asymmetric hopping of e$_g$ electrons between Mn ions along zig-zag spin chains
+(typical of the AFM-E spin configuration) is therefore enhanced under strain,
+explaining the large value of the polarization. We reproduce the change in the
+orbital ordering pattern in a degenerate double-exchange model supplemented
+with electron-phonon interaction. In this picture, the orbital ordering change
+is related to a change of the Berry phase of the e$_g$ electrons, which in turn
+causes an increase of the polarization, whose origin is purely electronic.",1102.2168v1
+2015-07-29,H$_4$: A Challenging System For Natural Orbital Functional Approximations,"The correct description of nondynamic correlation by electronic structure
+methods not belonging to the multireference family is a challenging issue. The
+transition of $D_{2h}$ to $D_{4h}$ symmetry in H$_4$ molecule is among the most
+simple archetypal examples to illustrate the consequences of missing nondynamic
+correlation effects. The resurge of interest in density matrix functional
+methods has brought several new methods including the family of Piris Natural
+Orbital Functionals (PNOF). In this work we compare PNOF5 and PNOF6, which
+include nondynamic electron correlation effects to some extent, with other
+standard ab initio methods in the H$_4$ $D_{4h}/D_{2h}$ potential energy
+surface. Thus far, the wrongful behavior of single-reference methods at the
+$D_{2h}-D_{4h}$ transition of H$_4$ has been attributed to wrong account of
+nondynamic correlation effects, whereas in geminal-based approaches it has been
+assigned to a wrong coupling of spins and the localized nature of the orbitals.
+We will show that actually $\textit{interpair}$ nondynamic correlation is the
+key to a cusp-free qualitatively correct description of H$_4$ PES. By
+introducing $\textit{interpair}$ nondynamic correlation, PNOF6 is shown to
+avoid cusps and provide the correct smooth PES features at distances close to
+equilibrium, total and local spin properties along with the correct electron
+delocalization, as reflected by natural orbitals and multicenter delocalization
+indices.",1507.08244v2
+2018-02-18,Orbitally limited pair-density wave phase of multilayer superconductors,"We investigate the magnetic field dependence of an ideal superconducting
+vortex lattice in the parity-mixed pair-density wave phase of multilayer
+superconductors within a circular cell Ginzburg-Landau approach. In multilayer
+systems, due to local inversion symmetry breaking, a Rashba spin-orbit coupling
+is induced at the outer layers. This combined with a perpendicular paramagnetic
+(Pauli) limiting magnetic field stabilizes a staggered layer dependent
+pair-density wave phase in the superconducting singlet channel. The high-field
+pair-density wave phase is separated from the low-field BCS phase by a
+first-order phase transition. The motivating guiding question in this paper is:
+what is the minimal necessary Maki parameter $\alpha_M$ for the appearance of
+the pair-density wave phase of a superconducting trilayer system? To address
+this problem we generalize the circular cell method for the regular flux-line
+lattice of a type-II superconductor to include paramagnetic depairing effects.
+Then, we apply the model to the trilayer system, where each of the layers are
+characterized by Ginzburg-Landau parameter $\kappa_0$, and a Maki parameter
+$\alpha_M$. We find that when the spin-orbit Rashba interaction compares to the
+superconducting condensation energy, the orbitally limited pair-density wave
+phase stabilizes for Maki parameters $\alpha_M> 10$.",1802.06365v1
+2015-12-03,Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6,"We report the revised crystal structure, static and dynamic magnetic
+properties of quasi-two dimensional honeycomb-lattice silver delafossite
+Ag3Co2SbO6. The magnetic susceptibility and specific heat data are consistent
+with the onset of antiferromagnetic long range order at low temperatures with
+N\'eel temperature TN ~ 21.2 K. In addition, the magnetization curves revealed
+a field-induced (spin-flop type) transition below TN in moderate magnetic
+fields. The GGA+U calculations show the importance of the orbital degrees of
+freedom, which maintain a hierarchy of exchange interaction in the system. The
+strongest antiferromagnetic exchange coupling was found in the shortest Co-Co
+pairs and is due to direct and superexchange interactions between the
+half-filled xz+yz orbitals pointing directly to each other. The other four out
+of six nearest neighbor exchanges within the cobalt hexagon are suppressed,
+since for these bonds active half-filled orbitals turned out to be parallel and
+do not overlap. The electron spin resonance (ESR) spectra reveal a Gaussian
+shape line attributed to Co2+ ion in octahedral coordination with average
+effective g-factor g=2.3+/-0.1 at room temperature and shows strong divergence
+of ESR parameters below 120 K, which imply an extended region of short-range
+correlations. Based on the results of magnetic and thermodynamic studies in
+applied fields, we propose the magnetic phase diagram for the new
+honeycomb-lattice delafossite.",1512.01016v1
+2015-12-10,Two-site fluctuations and multipolar superexchange interactions in strongly correlated systems,"An approach is proposed for evaluating dipolar and multipolar inter-site
+interactions in strongly correlated materials. This approach is based on the
+single-site dynamical mean-field theory (DMFT) in conjunction with the atomic
+approximation for the local self-energy. Starting from the local moment
+paramagnetic state described by DMFT we derive inter-site interactions by
+considering the response of the DMFT grand potential to small fluctuations of
+atomic configurations on two neighboring sites. The present method is validated
+by applying it to one-band and two-band e$_g$ Hubbard models on the
+simple-cubic 3$d$ lattice. It is also applied to study the spin-orbital order
+in the parent cubic structure of ternary chromium fluoride KCrF$_3$. We obtain
+the onset of a G-type antiferro-orbital order at a significantly lower
+temperature compared to that in real distorted KCrF$_3$. In contrast, its
+layered A-type antiferromagnetic order and N\'eel temperature are rather well
+reproduced. The calculated full Kugel-Khomskii Hamiltonian contains
+spin-orbital coupling terms inducing a misalignment in the antiferro-orbital
+order upon the onset of antiferromagnetism.",1512.03394v3
+2020-06-21,Chemical Bonding Governs Complex Magnetism in MnPt5P,"Subtle changes in chemical bonds may result in dramatic revolutions in
+magnetic properties in solid state materials. MnPt5P, a new derivative of the
+rare-earth-free ferromagnetic MnPt5As, was discovered and is presented in this
+work. MnPt5P was synthesized and its crystal structure and chemical composition
+were characterized by X-ray diffraction as well as energy-dispersive X-ray
+spectroscopy. Accordingly, MnPt5P crystallizes in the layered tetragonal
+structure with the space group P4/mmm (No. 123), in which the face-shared
+Mn@Pt12 polyhedral layers are separated by P layers. In contrast to the
+ferromagnetism observed in MnPt5As, the magnetic properties measurements on
+MnPt5P show antiferromagnetic ordering occurs at ~188 K with a strong magnetic
+anisotropy in and out of the ab-plane. Moreover, a spin-flop transition appears
+when a high magnetic field is applied. An A-type antiferromagnetic structure
+was obtained from the analysis of powder neutron diffraction (PND) patterns
+collected at 150 K and 9 K. Calculated electronic structures imply that
+hybridization of Mn-3d and Pt-5d orbitals are critical for both the structural
+stability and observed magnetic properties. Semi-empirical molecular orbitals
+calculations on both MnPt5P and MnPt5As indicate that the lack of 4p character
+on the P atoms at the highest occupied molecular orbital (HOMO) in MnPt5P may
+cause the different magnetic behavior in MnPt5P compared to MnPt5As. The
+discovery of MnPt5P, along with our previously reported MnPt5As, parametrizes
+the end points of a tunable system to study the chemical bonding which tunes
+the magnetic ordering from ferromagnetism to antiferromagnetism with strong
+spin-orbit coupling (SOC) effect.",2006.11903v1
+2021-06-29,Breakup of the Synchronous State of Binary Asteroid Systems,"This paper continues the authors' previous work and presents a coplanar
+averaged ellipsoid-ellipsoid model of synchronous binary asteroid system (BAS)
+plus thermal and tidal effects. Using this model, we analyze the breakup
+mechanism of the synchronous BAS. Different from the classical spin-orbit
+coupling model which neglects the rotational motion's influence on the orbital
+motion, our model considers simultaneously the orbital motion and the
+rotational motions. Our findings are following. (1) Stable region of the
+secondary's synchronous state is mainly up to the secondary's shape. The
+primary's shape has little influence on it. (2) The stable region shrinks
+continuously with the increasing value of the secondary's shape parameter
+$a_B/b_B$. Beyond the value of $a_B/b_B=\sqrt{2}$, the planar stable region for
+the secondary's synchronous rotation is small but not zero. (3) Considering the
+BYORP torque, our model shows agreement with the 1-degree of freedom adiabatic
+invariance theory in the outwards migration process, but an obvious difference
+in the inwards migration process. In particular, our studies show that the
+so-called 'long-term' stable equilibrium between the BYORP torque and the tidal
+torque is never a real equilibrium state, although the binary asteroid system
+can be captured in this state for quite a long time. (4) In case that the
+primary's angular velocity gradually reduces due to the YORP effect, the
+secondary's synchronous state may be broken when the primary's rotational
+motion crosses some major spin-orbit resonances.",2106.15039v1
+2024-01-09,Jahn-Teller driven quadrupolar ordering and spin-orbital dimer formation in GaNb$_{4}$Se$_{8}$,"The lacunar spinel GaNb$_4$Se$_8$ is a tetrahedral cluster Mott insulator
+where spin-orbit coupling on molecular orbitals and Jahn-Teller energy scales
+are competitive. GaNb$_4$Se$_8$ undergoes a structural and anti-polar ordering
+transition at T$_Q$ = 50 K that corresponds to a quadrupolar ordering of
+molecular orbitals on Nb$_4$ clusters. A second transition occurs at T$_M$ = 29
+K, where local distortions on the Nb$_4$ clusters rearrange. We present a
+single crystal x-ray diffraction investigation these phase transitions and
+solve the crystal structure in the intermediate T$_M$ < T < T$_Q$ and low T <
+T$_M$ temperature phases. The intermediate phase is a primitive cubic P2$_1$3
+structure with a staggered arrangement of Nb4 cluster distortions. A symmetry
+mode analysis reveals that the transition at TQ is continuous and described by
+a single Jahn-Teller active amplitude mode. In the low temperature phase, the
+symmetry of Nb$_4$ clusters is further reduced and the unit cell doubles into
+an orthorhombic P2$_1$2$_1$2$_1$ space group. Nb$_4$ clusters rearrange through
+this transition to form a staggered arrangement of intercluster dimers,
+suggesting a valence bond solid magnetic state.",2401.04671v1
+2024-04-02,"Black Hole-Disk Interactions in Magnetically Arrested Active Galactic Nuclei: General Relativistic Magnetohydrodynamic Simulations Using A Time-Dependent, Binary Metric","Perturber objects interacting with supermassive black hole accretion disks
+are often invoked to explain observed quasi-periodic behavior in active
+galactic nuclei (AGN). We present global, 3D general relativistic
+magnetohydrodynamic (GRMHD) simulations of black holes on inclined orbits
+colliding with magnetically arrested thick AGN disks using a binary black hole
+spacetime with mass ratio $0.1$. We do this by implementing an approximate
+time-dependent binary black hole metric into the GRMHD code Athena++. The
+secondary enhances the unbound mass outflow rate 2-4 times above that provided
+by the disk in quasi-periodic outbursts, eventually merging into a more
+continuous outflow at larger distances. We present a simple analytic model that
+qualitatively agrees well with this result and can be used to extrapolate to
+unexplored regions of parameter space. We show self-consistently for the first
+time that spin-orbit coupling between the primary black hole spin and the
+binary orbital angular momentum causes the accretion disk and jet directions to
+precess significantly (by 60$^\circ$-80$^\circ$) on long time-scales (e.g.,
+$\sim$ 20 times the binary orbital period). Because this effect may be the only
+way for thick AGN disks to consistently precess, it could provide strong
+evidence of a secondary black hole companion if observed in such a system.
+Besides this new phenomenology, the time-average properties of the disk and
+accretion rates onto the primary are only marginally altered by the presence of
+the secondary, consistent with our estimate for a perturbed thick disk. This
+situation might drastically change in cooled thin disks.",2404.02193v1
+2005-11-29,Transformation of spin information into large electrical signals via carbon nanotubes,"Spin electronics (spintronics) exploits the magnetic nature of the electron,
+and is commercially exploited in the spin valves of disc-drive read heads.
+There is currently widespread interest in using industrially relevant
+semiconductors in new types of spintronic devices based on the manipulation of
+spins injected into a semiconducting channel between a spin-polarized source
+and drain. However, the transformation of spin information into large
+electrical signals is limited by spin relaxation such that the magnetoresistive
+signals are below 1%. We overcome this long standing problem in spintronics by
+demonstrating large magnetoresistance effects of 61% at 5 K in devices where
+the non-magnetic channel is a multiwall carbon nanotube that spans a 1.5 micron
+gap between epitaxial electrodes of the highly spin polarized manganite
+La0.7Sr0.3MnO3. This improvement arises because the spin lifetime in nanotubes
+is long due the small spin-orbit coupling of carbon, because the high nanotube
+Fermi velocity permits the carrier dwell time to not significantly exceed this
+spin lifetime, because the manganite remains highly spin polarized up to the
+manganite-nanotube interface, and because the interfacial barrier is of an
+appropriate height. We support these latter statements regarding the interface
+using density functional theory calculations. The success of our experiments
+with such chemically and geometrically different materials should inspire
+adventure in materials selection for some future spintronics",0511697v2
+2011-08-01,Electron spin relaxation in graphene with random Rashba field: Comparison of D'yakonov-Perel' and Elliott-Yafet--like mechanisms,"Aiming to understand the main spin relaxation mechanism in graphene, we
+investigate the spin relaxation with random Rashba field induced by both
+adatoms and substrate, by means of the kinetic spin Bloch equation approach.
+The charged adatoms on one hand enhance the Rashba spin-orbit coupling locally
+and on the other hand serve as Coulomb potential scatterers. Both effects
+contribute to spin relaxation limited by the D'yakonov-Perel' mechanism. In
+addition, the random Rashba field also causes spin relaxation by spin-flip
+scattering, manifesting itself as an Elliott-Yafet--like mechanism. Both
+mechanisms are sensitive to the correlation length of the random Rashba field,
+which may be affected by the environmental parameters such as electron density
+and temperature. By fitting and comparing the experiments from the Groningen
+group [J\'ozsa {\it et al.}, Phys. Rev. B {\bf 80}, 241403(R) (2009)] and
+Riverside group [Pi {\it et al.}, Phys. Rev. Lett. {\bf 104}, 187201 (2010);
+Han and Kawakami, {\it ibid.} {\bf 107}, 047207 (2011)] which show either
+D'yakonov-Perel'-- (with the spin relaxation rate being inversely proportional
+to the momentum scattering rate) or Elliott-Yafet--like (with the spin
+relaxation rate being proportional to the momentum scattering rate) properties,
+we suggest that the D'yakonov-Perel' mechanism dominates the spin relaxation in
+graphene. The latest experimental finding of a nonmonotonic dependence of spin
+relaxation time on diffusion coefficient by Jo {\it et al.} [Phys. Rev. B {\bf
+84}, 075453 (2011)] is also well reproduced by our model.",1108.0283v3
+2013-02-20,Photoelectron spin-flipping and texture manipulation in a topological insulator,"Recently discovered materials called three-dimensional topological insulators
+constitute examples of symmetry protected topological states in the absence of
+applied magnetic fields and cryogenic temperatures. A hallmark characteristic
+of these non-magnetic bulk insulators is the protected metallic electronic
+states confined to the material's surfaces. Electrons in these surface states
+are spin polarized with their spins governed by their direction of travel
+(linear momentum), resulting in a helical spin texture in momentum space. Spin-
+and angle-resolved photoemission spectroscopy (spin-ARPES) has been the only
+tool capable of directly observing this central feature with simultaneous
+energy, momentum, and spin sensitivity. By using an innovative photoelectron
+spectrometer with a high-flux laser-based light source, we discovered another
+surprising property of these surface electrons which behave like Dirac
+fermions. We found that the spin polarization of the resulting photoelectrons
+can be fully manipulated in all three dimensions through selection of the light
+polarization. These surprising effects are due to the spin-dependent
+interaction of the helical Dirac fermions with light, which originates from the
+strong spin-orbit coupling in the material. Our results illustrate unusual
+scenarios in which the spin polarization of photoelectrons is completely
+different from the spin state of electrons in the originating initial states.
+The results also provide the basis for a novel source of highly spin-polarized
+electrons with tunable polarization in three dimensions.",1302.5094v1
+2016-07-12,Quantum Spin Liquid States,"This article is an introductory review of the physics of quantum spin liquid
+(QSL) states. Quantum magnetism is a rapidly evolving field, and recent
+developments reveal that the ground states and low-energy physics of frustrated
+spin systems may develop many exotic behaviors once we leave the regime of
+semi-classical approaches. The purpose of this article is to introduce these
+developments. The article begins by explaining how semi-classical approaches
+fail once quantum mechanics become important and then describes the alternative
+approaches for addressing the problem. We discuss mainly spin $1/2$ systems,
+and we spend most of our time in this article on one particular set of
+plausible spin liquid states in which spins are represented by fermions. These
+states are spin-singlet states and may be viewed as an extension of Fermi
+liquid states to Mott insulators, and they are usually classified in the
+category of so-called $SU(2)$, $U(1)$ or $Z_2$ spin liquid states. We review
+the basic theory regarding these states and the extensions of these states to
+include the effect of spin-orbit coupling and to higher spin ($S>1/2$) systems.
+Two other important approaches with strong influences on the understanding of
+spin liquid states are also introduced: (i) matrix product states and projected
+entangled pair states and (ii) the Kitaev honeycomb model. Experimental
+progress concerning spin liquid states in realistic materials, including
+anisotropic triangular lattice systems ($\kappa$-(ET)$_{2}$Cu$_{2}$(CN)$_{3}$
+and EtMe$_{3}$Sb[(Pd(dmit)$_{2}$]$_{2}$), kagome lattice systems
+(ZnCu$_{3}$(OH)$_{6}$Cl$_{2}$) and hyperkagome lattice systems
+(Na$_{4}$Ir$_{3}$O$_{8}$), is reviewed and compared against the corresponding
+theories.",1607.03228v3
+2021-08-14,"Relativistic Mechanics Theory for Electrons that Exhibits Spin, Zitterbewegung, Superposition and Produces Dirac's Wave Equation","A neo-classical relativistic mechanics theory is presented where the spin of
+an electron is a natural part of its space-time path as a point particle. The
+fourth-order equation of motion corresponds to the same Lagrangian function in
+proper time as in special relativity except for an additional spin energy term.
+The total motion can be decomposed into a sum of a local spin motion about a
+point and a global motion of this point, called the spin center. The global
+motion is sub-luminal and obeys Newton's second law in proper time, the time
+for a clock fixed at the spin center, while the total motion occurs at the
+speed of light c, consistent with the eigenvalues of Dirac's velocity operators
+having magnitude c. The local spin motion corresponds to Schr\""odinger's
+zitterbewegung and is a perpetual motion, which for a free electron has a
+circular path in the spin-center frame. In an electro-magnetic field, this spin
+motion generates magnetic and electric dipole energies through the Lorentz
+force on the electron's point charge. The corresponding electric dipole energy
+is consistent with the spin-orbit coupling term in the corrected Pauli
+non-relativistic Hamiltonian but the magnetic dipole energy is one half of that
+in Dirac's theory. By defining a spin tensor as the angular momentum of the
+electron's total motion about its spin center, the fundamental equations of
+motion can be re-written in an identical form to those of the Barut-Zanghi
+electron theory. These equations of motion can then be expressed using
+operators applied to a state function of proper time satisfying a
+Dirac-Schr\""odinger spinor equation. The operators produce dynamic variables
+without any probability implications. For the free electron, the state function
+satisfies Dirac's relativistic wave equation when the Lorentz transformation is
+applied to express proper time in terms of an observer's space-time
+coordinates.",2108.07267v3
+2022-10-15,Parallel spin-momentum locking in a chiral topological semimetal,"Spin-momentum locking in solids describes a directional relationship between
+the electron's spin angular momentum and its linear momentum over the entire
+Fermi surface. While orthogonal spin-momentum locking, such as Rashba
+spin-orbit coupling, has been studied for decades and inspired a vast number of
+applications, its natural counterpart, the purely parallel spin-momentum
+locking, has remained elusive in experiments. Recently, chiral topological
+semimetals that host single- and multifold band crossings have been predicted
+to realize such parallel locking. Here, we use spin- and angle-resolved
+photoelectron spectroscopy to probe spin-momentum locking of a multifold
+fermion in the chiral topological semimetal PtGa via the spin-texture of its
+topological Fermi-arc surface states. We find that the electron spin of the
+Fermi-arcs points orthogonal to their Fermi surface contour for momenta close
+to the projection of the bulk multifold fermion, which is consistent with
+parallel spin-momentum locking of the latter. We anticipate that our discovery
+of parallel spin-momentum locking of multifold fermions will lead to the
+integration of chiral topological semimetals in novel spintronic devices, and
+the search for spin-dependent superconducting and magnetic instabilities in
+these materials.",2210.08221v1
+2024-04-05,Direct Electrical Detection of Spin Chemical Potential Due to Spin Hall Effect in $β$-Tungsten and Platinum Using a Pair of Ferromagnetic and Normal Metal Voltage probes,"The phenomenon of Spin Hall Effect (SHE) generates a pure spin current
+transverse to an applied current in materials with strong spin-orbit coupling,
+although not detectable through conventional electrical measurement. An
+intuitive Hall effect like measurement configuration is implemented to directly
+measure pure spin chemical potential of the accumulated spins at the edges of
+heavy metal (HM) channels that generates large SHE. A pair of transverse
+linearly aligned voltage probes in placed in ohmic contact with the top surface
+of HM , one being a ferromagnetic metal (FM) with non-zero spin polarization
+and other is the reference metal (RM) with zero polarization of carriers. This
+combination of FM/RM electrodes is shown to induce an additional voltage
+proportional to a spin accumulation potential, which is anti symmetric with
+respect to opposite orientations of FM controlled by a 2D vector magnet. Proof
+of concept of the measurement scheme is verified by comparing the signs of
+voltages for HM channels of Tungsten (W) and Platinum (Pt) which are known to
+generate opposite spin accumulation under similar conditions of applied
+current. The same devices are also able to detect the reciprocal effect,
+inverse spin Hall effect (ISHE) by swapping the current and voltage leads and
+the results are consistent with reciprocity principle. Further, exploiting a
+characteristic feature of W thin film deposition, a series of devices were
+fabricated with W resistivity varying over a wide range of 10 - 750 $\mu
+\Omega$-cm and the calculated spin Hall resistivity exhibits a pronounced power
+law dependence on resistivity. Our measurement scheme combined with almost two
+decades of HM resistivity variation provides the ideal platform required to
+test the underlying microscopic mechanism responsible for SHE/ISHE.",2404.03934v1
+2021-01-13,Spin-Induced Orbital Frustration in a Hexagonal Optical Lattice,"Complex lattices provide a versatile ground for fascinating quantum many-body
+physics. Here, we propose an exotic mechanics for generating orbital
+frustration in hexagonal lattices. We study two-component (pseudospin-$1/2$)
+Bose gases in $p$-orbital bands of two-dimensional hexagonal lattices, and find
+that the system exhibits previously untouched orbital frustration as a result
+of the interplay of spin and orbital degrees of freedom, in contrast to normal
+Ising-type orbital ordering of spinless $p$-orbital band bosons in
+two-dimensional hexagonal lattices. Based on the classification by symmetry
+analysis, we find the interplay of orbital frustration and strong interaction
+leads to exotic Mott and superfluid phases with spin-orbital intertwined
+orders, in spite of the complete absence of spin-orbital interaction in the
+Hamiltonian. Our study implies many-body correlations in a multi-orbital
+setting could induce rich spin-orbital intertwined physics in complex lattice
+structures.",2101.05367v2
+2000-11-02,"First principles study of the origin and nature of ferromagnetism in (Ga,Mn)As","The properties of diluted Ga$_{1-x}$Mn$_x$As are calculated for a wide range
+of Mn concentrations within the local spin density approximation of density
+functional theory. M\""ulliken population analyses and orbital-resolved
+densities of states show that the configuration of Mn in GaAs is compatible
+with either 3d$^5$ or 3d$^6$, however the occupation is not integer due to the
+large $p$-$d$ hybridization between the Mn $d$ states and the valence band of
+GaAs. The spin splitting of the conduction band of GaAs has a mean field-like
+linear variation with the Mn concentration and indicates ferromagnetic coupling
+with the Mn ions. In contrast the valence band is antiferromagnetically coupled
+with the Mn impurities and the spin splitting is not linearly dependent on the
+Mn concentration. This suggests that the mean field approximation breaks down
+in the case of Mn-doped GaAs and corrections due to multiple scattering must be
+considered. We calculate these corrections within a simple free electron model
+and find good agreement with our {\it ab initio} results if a large exchange
+constant ($N\beta=-4.5$eV) is assumed.",0011050v1
+2002-04-11,Role of spin-orbit coupling in the far infrared absorption of lateral semiconductor dots,"We investigate the relevance of the spin-orit coupling to the far-infrared
+absorption of two-dimensional semiconductor dots. Varying the strength of the
+Dresselhaus term, a mechanism feasible in experiment by changing the dot width,
+distinctive splittings of the Kohn peak as well as additional low energy modes
+are predicted in a non-interacting model. Each mode has a spatial distribution
+of charge, perpendicular and in-plane spin densities that correlate in a
+peculiar way with the frequency and polarization of the external field. We
+study the robustness of these features against electron-electron interactions
+as well as the appearance of interaction-induced additional characteristics.",0204256v1
+2002-12-03,Effective Hamiltonian for Ga_{1-x}Mn_xAs in the Dilute Limit,"We derive an effective Hamiltonian for ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ in
+the dilute limit, where ${\rm Ga}_{1-x}{\rm Mn}_x {\rm As}$ can be described in
+terms of spin $F=3/2$ polarons hopping between the {\rm Mn} sites and coupled
+to the local {\rm Mn} spins. We determine the parameters of our model from
+microscopic calculations. Our approach treats the large Coulomb interaction in
+a non-perturbative way, captures the effects of spin-orbit coupling and
+disorder, and is appropriate for other p-doped magnetic semiconductors. Our
+model applies to uncompensated {\rm Mn} concentrations up to $x \sim 0.03$.",0212074v2
+2005-02-24,Spin-related magnetoresistance of n-type ZnO:Al and Zn_{1-x}Mn_{x}O:Al thin films,"Effects of spin-orbit coupling and s-d exchange interaction are probed by
+magnetoresistance measurements carried out down to 50 mK on ZnO and
+Zn_{1-x}Mn_{x}O with x = 3 and 7%. The films were obtained by laser ablation
+and doped with Al to electron concentration ~10^{20} cm^{-3}. A quantitative
+description of the data for ZnO:Al in terms of weak-localization theory makes
+it possible to determine the coupling constant \lambda_{so} = (4.4 +-
+0.4)*10^{-11} eVcm of the kp hamiltonian for the wurzite structure, H_{so} =
+\lambda_{so}*c(s x k). A complex and large magnetoresistance of
+Zn_{1-x}Mn_{x}O:Al is interpreted in terms of the influence of the s-d
+spin-splitting and magnetic polaron formation on the disorder-modified
+electron-electron interactions. It is suggested that the proposed model
+explains the origin of magnetoresistance observed recently in many magnetic
+oxide systems.",0502574v1
+2005-06-20,Asymmetric exchange between electron spins in coupled semiconductor quantum dots,"We obtain a microscopic description of the interaction between electron spins
+in bulk semiconductors and in pairs of semiconductor quantum dots. Treating the
+k.p band mixing and the Coulomb interaction on the same footing, we obtain in
+the third order an asymmetric contribution to the exchange interaction arising
+from the coupling between the spin of one electron and the relative orbital
+motion of the other. This contribution does not depend on the inversion
+asymmetry of the crystal. We find that it is ~0.001 of the isotropic exchange,
+which is of interest in quantum information. Detailed evaluations are given for
+several quantum dot systems.",0506510v2
+2007-03-26,Magnetodielectric coupling in Mn3O4,"We have investigated the dielectric anomalies associated with spin ordering
+transitions in the tetragonal spinel Mn$_3$O$_4$, using thermodynamic,
+magnetic, and dielectric measurements. We find that two of the three magnetic
+ordering transitions in Mn$_3$O$_4$ lead to decreases in the temperature
+dependent dielectric constant at zero applied field. Applying a magnetic field
+to the polycrystalline sample leaves these two dielectric anomalies practically
+unchanged, but leads to an increase in the dielectric constant at the
+intermediate spin-ordering transition. We discuss possible origins for this
+magnetodielectric behavior in terms of spin-phonon coupling. Band structure
+calculations suggest that in its ferrimagnetic state, Mn$_3$O$_4$ corresponds
+to a semiconductor with no orbital degeneracy due to strong Jahn-Teller
+distortion.",0703685v1
+2009-01-30,Prediction of large linear-in-k spin splitting for holes in the 2D GaAs/AlAs system,"The spin-orbit interaction generally leads to spin splitting (SS) of electron
+and hole energy states in solids, a splitting that is characterized by a
+scaling with the wavevector $\bf k$. Whereas for {\it 3D bulk zincblende}
+solids the electron (heavy hole) SS exhibits a cubic (linear) scaling with $k$,
+in {\it 2D quantum-wells} the electron (heavy hole) SS is currently believed to
+have a mostly linear (cubic) scaling. Such expectations are based on using a
+small 3D envelope function basis set to describe 2D physics. By treating
+instead the 2D system explicitly in a multi-band many-body approach we discover
+a large linear scaling of hole states in 2D. This scaling emerges from hole
+bands coupling that would be unsuspected by the standard model that judges
+coupling by energy proximity. This discovery of a linear Dresselhaus k-scaling
+for holes in 2D implies a different understanding of hole-physics in
+low-dimensions.",0901.4943v2
+2009-08-31,Global nuclear structure effects of tensor interaction,"A direct fit of the isoscalar spin-orbit (SO) and both isoscalar and
+isovector tensor coupling constants to the f5/2-f7/2 SO splittings in 40Ca,
+56Ni, and 48Ca nuclei requires a drastic reduction of the isoscalar SO strength
+and strong attractive tensor coupling constants. The aim of this work is to
+address further consequences of these strong attractive tensor and weak SO
+fields on binding energies, nuclear deformability, and high-spin states. In
+particular, we show that contribution to the nuclear binding energy due to the
+tensor field shows generic magic structure with tensorial magic numbers at
+N(Z)=14, 32, 56, or 90 corresponding to the maximum spin-asymmetries in 1d5/2,
+1f7/2-2p3/2, 1g9/2-2d5/2 and 1h11/2-2f7/2 single-particle configurations and
+that these numbers are smeared out by pairing correlations and deformation
+effects. We also examine the consequences of strong attractive tensor fields
+and weak SO interaction on nuclear stability at the drip lines, in particular
+close to the tensorial doubly magic nuclei and discuss the possibility of an
+entirely new tensor-force driven deformation effect.",0908.4486v2
+2009-10-28,Effect of Tensor Correlations on Single-particle and Collective States,"We study the effect of tensor correlations on single-particle and collective
+states within Skyrme Hartree-Fock and RPA model. Firstly, We study the role of
+tensor interactions in Skyrme effective interaction on the spin-orbit
+splittings of N=82 isotones and Z=50 isotope.
+  The isospin dependence of the shell structure is well described as the
+results of the tensor interactions without destroying good properties of the
+binding energy and the rms charge radii of the heavy nuclei. Secondly, We
+performed self-consistent HF+RPA calculations for charge exchange 1$^+$ states
+in $^{90}$Zr and $^{208}$Pb to elucidate the role of tensor interactions on
+spin dependent excitations. It is pointed out that Gamow-Teller(GT) states can
+couple strongly with the spin-quadrupole (SQ) 1$^+$ states in the high energy
+region above E$_x$=30 MeV due to the tensor interactions. As the result of this
+coupling, more than 10% of the GT strength is shifted to the energy region
+above 30 MeV, and the main GT peak is moved 2 MeV downward.",0910.5277v1
+2010-02-04,Magnetic excitations in ferro-pnictide materials controlled by a quantum critical point into hidden order,"The two-orbital J1-J2 model that describes a square lattice of frustrated
+spin-1 iron atoms is analyzed within the linear spin-wave approximation and by
+exact diagonalization over a 4x4 cluster. A quantum critical point (QCP) is
+identified that separates hidden magnetic order at weak Hund's rule coupling
+from a commensurate spins density wave (cSDW) at strong Hund's rule coupling.
+Although the moment for cSDW order is small at the QCP, the critical linear
+spin-wave spectrum shows strong low-energy excitations centered at the
+wavenumbers that correspond to cSDW order. These disperse anisotropically. A
+fit to the magnetic excitation spectrum of ferro-pnictide materials obtained
+recently by inelastic neutron scattering measurements notably accounts for the
+absence of softening at the wavenumber that corresponds to Neel order.",1002.0891v3
+2011-06-30,Superconductivity near Pomeranchuk instabilities in the spin channel,"We study the competition between a Pomeranchuk instability in the spin
+channel with angular momentum $\ell=1$ and an attractive interaction, favoring
+Cooper-pair formation. We found that the superconducting gap strongly
+suppresses the phase space for the Pomeranchuk instability. We computed a
+mean-field phase diagram displaying a first order transition between two
+superconductor phases with different symmetries: p-wave (with spontaneously
+generated spin-orbit interaction) and s-wave for greater values of the coupling
+constant. Moreover, we have looked for a possible modulated superconducting
+phase. We have found that this phase appears only as a meta-stable state in the
+strong coupling regime.",1106.6311v3
+2011-08-18,Gravitomagnetism and spinor quantum mechanics,"We give a systematic treatment of a spin 1/2 particle in a combined
+electromagnetic field and a weak gravitational field that is produced by a
+slowly moving matter source. This paper continues previous work on a spin zero
+particle, but it is largely self-contained and may serve as an introduction to
+spinors in a Riemann space. The analysis is based on the Dirac equation
+expressed in generally covariant form and coupled minimally to the
+electromagnetic field. The restriction to a slowly moving matter source, such
+as the earth, allows us to describe the gravitational field by a
+gravitoelectric (Newtonian) potential and a gravitomagnetic (frame-dragging)
+vector potential, the existence of which has recently been experimentally
+verified. Our main interest is the coupling of the orbital and spin angular
+momenta of the particle to the gravitomagnetic field. Specifically we calculate
+the gravitational gyromagnetic ratio as gsubg=1 ; this is to be compared with
+the electromagnetic gyromagnetic ratio of gsube=2 for a Dirac electron.",1108.3859v1
+2012-09-05,Optical measurement and modeling of interactions between two hole or two electron spins in coupled InAs quantum dots,"Two electron spins in quantum dots coupled through coherent tunneling are
+generally acknowledged to approximately obey Heisenberg isotropic exchange.
+This has not been established for two holes. Here we measure the spectra of two
+holes and of two electrons in two vertically stacked self-assembled InAs
+quantum dots using optical spectroscopy as a function of electric and magnetic
+fields. We find that the exchange is approximately isotropic for both systems,
+but that significant asymmetric contributions, arising from spin-orbit and
+Zeeman interactions combined with spatial asymmetries, are required to explain
+large anticrossings and fine-structure energy splittings in the spectra.
+Asymmetric contributions to the isotropic Hamiltonian for electrons are of the
+order of a few percent while those for holes are an order of magnitude larger.",1209.0920v2
+2012-10-17,Odd parity bottom-flavored baryon resonances,"The LHCb Collaboration has recently observed two narrow baryon resonances
+with beauty. Their masses and decay modes look consistent with the quark model
+orbitally excited states Lambda_b(5912) and Lambda*_b(5920), with quantum
+numbers J^P=1/2^- and 3/2^-, respectively. We predict the existence of these
+states within a unitarized meson-baryon coupled-channel dynamical model, which
+implements heavy-quark spin symmetry. Masses, quantum numbers and couplings of
+these resonances to the different meson-baryon channels are obtained. We find
+that the resonances Lambda^0_b(5912) and Lambda^0_b(5920) are heavy-quark spin
+symmetry partners, which naturally explains their approximate mass degeneracy.
+Corresponding bottom-strange baryon resonances are predicted at Xi_b(6035.4)
+(J^P=1/2^-) and Xi_b(6043.3) (J^P=3/2^-). The two Lambda_b and two Xi_b
+resonances complete a multiplet of SU(3)-flavor times heavy-quark spin
+symmetry.",1210.4755v3
+2012-11-08,Giant atomic displacement induced by built-in strain in metastable Mn$_3$O$_4$,"We present x-ray, neutron scattering and heat capacity data that reveal a
+coupled first-order magnetic and structural phase transition of the metastable
+mixed-valence post-spinel compound Mn$_3$O$_4$ at 210 K. Powder neutron
+diffraction measurements reveal a magnetic structure in which Mn$^{3+}$ spins
+align antiferromagnetically along the edge-sharing \emph{a}-axis, with a
+magnetic propagation vector k = [1/2, 0, 0]. In contrast, the Mn$^{2+}$ spins,
+which are geometrically frustrated, do not order until a much lower
+temperature. Although the Mn$^{2+}$ spins do not directly participate in the
+magnetic phase transition at 210 K, structural refinements reveal a large
+atomic shift at this phase transition, corresponding to a physical motion of
+approximately 0.25 {\AA} even though the crystal symmetry remains unchanged.
+This ""giant"" response is due to the coupled effect of built-in strain in the
+metastable post-spinel structure with the orbital realignment of the Mn$^{3+}$
+ion.",1211.1667v1
+2012-12-06,Indirect exchange interaction between magnetic adatoms in a monolayer MoS2,"We study the Ruderman-Kittle-Kasuya-Yosida (RKKY) interaction in a monolayer
+MoS$_2$. We show that the rotation of the itinerant electron spin due to the
+spin-orbit coupling causes a twisted interaction between two magnetic adatoms
+which consists of different RKKY coupling terms, the Heisenberg,
+Dzyaloshinsky-Moriya and Ising interactions. We find that the interaction terms
+are very sensitive to the Fermi energy values and change dramatically from
+doped to undoped systems. A finite doping causes that all parts of the
+interaction oscillate with the distance of two magnetic impurities, $R$ and the
+interaction behaves like $R^{-2}$ for the long distance between two localized
+spins. We explore a beating pattern of oscillations of the RKKY interaction
+which occurs for the doped system.",1212.1318v2
+2013-05-06,Spin fluctuations and pairing symmetry in A$_{x}$Fe$_{2-y}$Se$_{2}$: dual effect of the itinerant and the localized nature of electrons,"We investigate the spin fluctuations and the pairing symmetry in
+A$_{x}$Fe$_{2-y}$Se$_{2}$ by the fluctuation exchange approximation. Besides
+the on-site interactions, the next-nearest-neighbor antiferromagnetic coupling
+$J_{2}$ is also included. We find that both the itinerant and the localized
+natures of electrons are important to describe the recent experimental results
+of the spin fluctuations and the pairing symmetry. In particular, a small
+$J_{2}$ coupling can change the pairing gap from the d-wave symmetry to the
+s-wave symmetry. We have also studied the real-space structures of the gap
+functions for different orbits in order to gain more insight on the nature of
+the pairing mechanism.",1305.1090v1
+2013-07-12,The electron-phonon interaction from fundamental local gauge symmetries in solids,"The elastic properties of solids are described in close analogy with General
+Relativity, by locally gauging the translational group of space-time. Electron
+interactions with the crystal lattice are thus generated by enforcing full
+gauge invariance, with the introduction of a gauge field. Elementary
+excitations are associated with the local gauge, contrasting to the usual
+interpretation as being Goldstone bosons emerging from global symmetry
+breaking. In the linear limit of the theory, the gauge field displays elastic
+waves, that we identify with acoustic phonons, when the field is quantized.
+Coupling with the electronic part of the system yields the standard
+electron-phonon interaction. If spin-orbit effects are included, unusual
+couplings emerge between the strain field and the electronic spin current,
+leading to novel physics that may be relevant for spintronic applications.",1307.3571v1
+2014-09-29,Zero-field and time-reserval-symmetry-broken topological phase transitions in graphene,"We propose a quantum electronic device based on strained graphene nanoribbon.
+Mechanical strain, internal exchange field and spin-orbit couplings (SOCs) have
+been exploited as principle parameters to tune physical properties of the
+device. We predict a remarkable zero-field topological quantum phase transition
+between the time-reversal-symmetry broken quantum spin hall (QSH) and quantum
+anomalous hall (QAH) states, which was previously thought to take place only in
+the presence of finite magnetic field. We illustrate as intrinsic SOC is tuned,
+how two different helicity edge states located in the opposite edges of the
+nanoribbon exchange their locations. Our results indicates that pseudomagnetic
+field induced by the strain could be coupled to the spin degrees of freedom
+through the SOC responsible for the stability of QSH state. The controllability
+of this zero-field phase transition with strength and direction of the strain
+is also demonstrated. Our prediction offers a tempting prospect of strain,
+electric and magnetic manipulation of the QSH effect.",1409.8247v2
+2014-10-31,Thermal conductivity across the metal-insulator transition in single crystalline hyperkagome Na$_{3+x}$Ir$_3$O$_8$,"The hyperkagome antiferromagnet Na$_{4}$Ir$_3$O$_8$ represents the first
+genuine candidate for the realisation of a three-dimensional quantum
+spin-liquid. It can also be doped towards a metallic state, thus offering a
+rare opportunity to explore the nature of the metal-insulator transition in
+correlated, frustrated magnets. Here we report thermodynamic and transport
+measurements in both metallic and weakly insulating single crystals down to 150
+mK. While in the metallic sample the phonon thermal conductivity
+($\kappa^{ph}$) is almost in the boundary scattering regime, in the insulating
+sample we find a large reduction $\kappa^{ph}$ over a very wide temperature
+range. This result can be ascribed to the scattering of phonons off nanoscale
+disorder or off the gapless magnetic excitations that are seen in the
+low-temperature specific heat. This works highlights the peculiarity of the
+metal-insulator transition in Na$_{3+x}$Ir$_3$O$_8$ and demonstrates the
+importance of the coupling between lattice and spin degrees of freedom in the
+presence of strong spin-orbit coupling.",1410.8792v1
+2015-02-27,Backscattering in helical edge states from a magnetic impurity and Rashba disorder,"Transport by helical edge states of a quantum spin Hall insulator is
+experimentally characterized by a weakly temperature-dependent mean free path
+of a few microns and by reproducible conductance oscillations, challenging
+proposed theoretical explanations. We consider a model where edge electrons
+experience spatially random Rashba spin-orbit coupling and couple to a magnetic
+impurity with spin S >= 1/2. In a finite bias steady state, we find for S > 1/2
+an impurity induced resistance with a temperature dependence in agreement with
+experiments. Since backscattering is elastic, interference between different
+scatterers possibly explains conductance fluctuations.",1502.07927v2
+2015-06-17,Rarita-Schwinger-Weyl semimetal in Jeff=3/2 electron systems,"We propose a relativistic Jeff=3/2 semimetal with 4d1 or 5d1 electrons on a
+cubic lattice when the strong spin-orbital coupling takes over the Hunds'
+coupling. A relativistic spinor with spin 3/2 is historically called
+Rarita-Schwinger spinor. In the massless case, the right- and left-handed
+chiral degrees of freedom of the Rarita-Schwinger spinors are independent. In
+the lattice model that we propose, the right- and left- handed gapless points
+in Brillouin zone are separated. We call this linearly dispersed semimetal
+Rarita-Schwinger-Weyl semimetal, similar to Weyl semimetal for spin 1/2
+systems. There is a network of gapless Fermi arcs in the surface Brillouin zone
+if n1+n2+n3 is even for the normal vector (n1,n2,n3) of the surface while the
+surface is insulator if n1+n2+n3 is odd.",1506.05359v1
+2015-06-25,Two Dimensional Ising Superconductivity in Gated MoS$_{2}$,"The Zeeman effect, which is usually considered to be detrimental to
+superconductivity, can surprisingly protect the superconducting states created
+by gating a layered transition metal dichalcogenide. This effective Zeeman
+field, which is originated from intrinsic spin orbit coupling induced by
+breaking in-plane inversion symmetry, can reach nearly a hundred Tesla in
+magnitude. It strongly pins the spin orientation of the electrons to the
+out-of-plane directions and protects the superconductivity from being destroyed
+by an in-plane external magnetic field. In magnetotransport experiments of
+ionic-gate MoS$_{2}$ transistors, where gating prepares individual
+superconducting state with different carrier doping, we indeed observe a spin-
+protected superconductivity by measuring an in-plane critical field
+$\textit{B}$$_{c2}$ far beyond the Pauli paramagnetic limit. The
+gating-enhanced $\textit{B}$$_{c2}$ is more than an order of magnitude larger
+compared to the bulk superconducting phases where the effective Zeeman field is
+weakened by interlayer coupling. Our study gives the first experimental
+evidence of an Ising superconductor, in which spins of the pairing electrons
+are strongly pinned by an effective Zeeman field.",1506.07620v2
+2015-11-25,"Antiferromagnetism, $f$-wave and chiral $p$-wave superconductivity in a Kagome lattice with possible application to $sd^2$-graphenes","We investigate the electronic instabilities in a Kagome lattice with Rashba
+spin-orbital coupling by the unbiased singular-mode functional renormalization
+group. At the parent $1/3$-filling, the normal state is a quantum spin Hall
+system. Since the bottom of the conduction band is near the van Hove
+singularity, the electron-doped system is highly susceptible to competing
+orders upon electron interactions. The topological nature of the parent system
+enriches the complexity and novelty of such orders. We find $120^o$-type
+intra-unitcell antiferromagnetic order, $f$-wave superconductivity and chiral
+$p$-wave superconductivity with increasing electron doping above the van Hove
+point. In both types of superconducting phases, there is a mixture of
+comparable spin singlet and triplet components because of the Rashba coupling.
+The chiral $p$-wave superconducting state is characterized by a Chern number
+$Z=1$, supporting a branch of Weyl fermion states on each edge. The model bares
+close relevance to the so-called $sd^2$-graphenes proposed recently.",1511.08001v1
+2016-02-19,Critical Temperature Enhancement of Topological Superconductors: A Dynamical Mean Field Study,"We show that a critical temperature Tc for spin-singlet two-dimensional
+superconductivity is enhanced by a cooperation between the Zeeman magnetic
+field and the Rashba spin-orbit coupling, where a superconductivity becomes
+topologically non-trivial below Tc. The dynamical mean field theory (DMFT) with
+the segment-based hybridization-expansion continuous-time quantum Monte Carlo
+impurity solver (ct-HYB) is used for accurately evaluating a critical
+temperature, without any Fermion sign problem. A strong-coupling approach shows
+that spin-flip driven local pair hopping leads to part of this enhancement,
+especially effects of the magnetic field. We propose physical settings suitable
+for verifying the present calculations, one-atom-layer system on Si(111) and
+ionic-liquid based electric double-layer transistors (EDLTs).",1602.06087v2
+2016-09-14,Rashba-Edelstein Magnetoresistance in Metallic Heterostructure,"We report the observation of magnetoresistance originating from Rashba
+spin-orbit coupling (SOC) in a metallic heterostructure: the Rashba-Edelstein
+(RE) magnetoresistance. We show that the simultaneous action of the direct and
+inverse RE effects in a Bi/Ag/CoFeB trilayer couples current-induced spin
+accumulation to the electric resistance. The electric resistance changes with
+the magnetic-field angle, reminiscent of the spin Hall magnetoresistance,
+despite the fact that bulk SOC is not responsible for the magnetoresistance. We
+further found that, even when the magnetization is saturated, the resistance
+increases with increasing the magnetic-field strength, which is attributed to
+the Hanle magnetoresistance in this system.",1609.04122v1
+2017-03-08,Observation of topological Bloch-state defects and their merging transition,"Topological defects in Bloch bands, such as Dirac points in graphene, and
+their resulting Berry phases play an important role for the electronic dynamics
+in solid state crystals. Such defects can arise in systems with a two-atomic
+basis due to the momentum-dependent coupling of the two sublattice states,
+which gives rise to a pseudo-spin texture. The topological defects appear as
+vortices in the azimuthal phase of this pseudo-spin texture. Here, we
+demonstrate a complete measurement of the azimuthal phase in a hexagonal
+optical lattice employing a versatile method based on time-of-flight imaging
+after off-resonant lattice modulation. Furthermore we map out the merging
+transition of the two Dirac points induced by beam imbalance. Our work paves
+the way to accessing geometric properties in optical lattices also with
+spin-orbit coupling and interactions.",1703.02813v2
+2017-08-12,Localized magnetic moments with tunable spin exchange in a gas of ultracold fermions,"We report on the experimental realization of a state-dependent lattice for a
+two-orbital fermionic quantum gas with strong interorbital spin exchange. In
+our state-dependent lattice, the ground and metastable excited electronic
+states of $^{173}$Yb take the roles of itinerant and localized magnetic
+moments, respectively. Repulsive on-site interactions in conjunction with the
+tunnel mobility lead to spin exchange between mobile and localized particles,
+modeling the coupling term in the well-known Kondo Hamiltonian. In addition, we
+find that this exchange process can be tuned resonantly by varying the on-site
+confinement. We attribute this to a resonant coupling to center-of-mass excited
+bound states of one interorbital scattering channel.",1708.03810v2
+2014-03-23,Non-collinear Andreev reflections in semiconductor nanowires,"We show that noncollinear Andreev reflections can be induced at interfaces of
+semiconductor nanowires with spin-orbit coupling, Zeeman splitting and
+proximity-induced superconductivity. In a noncollinear local Andreev
+reflection, the spin polarizations of the injected and the retro-reflected
+carriers are typically at an angle which is tunable via system parameters.
+While in a nonlocal transport, this noncollinearity enables us to identify and
+block, at different voltage configurations, the noncollinear cross Andreev
+reflection and the direct charge transfer processes. We demonstrate that the
+intriguing noncollinearity originates from the spin-dependent coupling between
+carriers in the lead and the lowest discrete states in the wire, which, for a
+topological superconducting nanowire, are related to the overlap-induced
+hybridization of Majorana edge states in a finite system. These interesting
+phenomena can be observed in semiconductor nanowires of experimentally relevant
+lengths, and are potentially useful for spintronics.",1403.5756v3
+2008-07-18,Optical properties of ZnCr2Se4 - Spin-phonon coupling and electronic d-d-like excitations,"We studied the optical properties of antiferromagnetic ZnCr2Se4 by infrared
+spectroscopy up to 28,000 cm-1 and for temperatures from 5 to 295 K. At the
+magnetic phase transition at 21 K, one of the four phonon modes reveals a clear
+splitting of 3 cm-1 as a result of spin-phonon coupling, the other three
+optical eigenmodes only show shifts of the eigenfrequencies. The
+antiferromagnetic ordering and the concomitant splitting of the phonon mode can
+be suppressed in a magnetic field of 7 T. At higher energies we observed a
+broad excitation band which is dominated by a two-peak-structure at about
+18,000 cm-1 and 22,000 cm-1, respectively. These energies are in good agreement
+with the expected spin-allowed crystal-field transition of the Cr3+ ions. The
+unexpected strength of these forbidden onsite d-d transitions is attributed to
+a considerable hybridization of the selenium p with the chromium d orbitals.",0807.2935v2
+2009-12-08,Proposal for manipulating and detecting spin and orbital states of trapped electrons on helium using cavity quantum electrodynamics,"We propose to couple an on-chip high finesse superconducting cavity to the
+lateral-motion and spin state of a single electron trapped on the surface of
+superfluid helium. We estimate the motional coherence times to exceed 15
+microseconds, while energy will be coherently exchanged with the cavity photons
+in less than 10 nanoseconds for charge states and faster than 1 microsecond for
+spin states, making the system attractive for quantum information processing
+and cavity quantum electrodynamics experiments. Strong interaction with cavity
+photons will provide the means for both nondestructive readout and coupling of
+distant electrons.",0912.1406v3
+2014-06-23,Kane-Mele-Hubbard model on the $π$-flux honeycomb lattice,"We consider the Kane-Mele-Hubbard model with a magnetic $\pi$ flux threading
+each honeycomb plaquette. The resulting model has remarkably rich physical
+properties. In each spin sector, the noninteracting band structure is
+characterized by a total Chern number $C=\pm 2$. Fine-tuning of the intrinsic
+spin-orbit coupling $\lambda$ leads to a quadratic band crossing point
+associated with a topological phase transition. At this point, quantum Monte
+Carlo simulations reveal a magnetically ordered phase which extends to weak
+coupling. Although the spinful model has two Kramers doublets at each edge and
+is explicitly shown to be a $Z_{2}$ trivial insulator, the helical edge states
+are protected at the single-particle level by translation symmetry. Drawing on
+the bosonized low-energy Hamiltonian, we predict a correlation-induced gap as a
+result of umklapp scattering for half-filled bands. For strong interactions,
+this prediction is confirmed by quantum Monte Carlo simulations.",1406.6077v2
+2017-06-04,Directing nanoscale optical flows by coupling photon spin to plasmon extrinsic angular momentum,"As any physical object, light undergoing a circular trajectory features a
+constant extrinsic angular momentum. Within strong curvatures, this angular
+momentum can match the spin momentum of a photon, thus providing the
+opportunity of a strong spin-orbit interaction. Using this effect, we
+demonstrate tunable symmetry breaking in the coupling of light in a curved
+nanoscale plasmonic waveguide. The helicity of the impinging optical wave
+controls the power distribution between the two counter-propagating guided
+modes, including unidirectional waveguiding. We found that up to 95 % of the
+incoupled light can be directed into one of the two propagation directions of
+the waveguide. This approach offers appealing new prospects for the development
+of advanced, deeply subwavelength optical functionalities.",1706.01125v2
+2017-10-31,Generation and control of noncollinear magnetism by supercurrent,"When superconductivity couples with noncollinear spin textures, rich physics
+arises; for instance, singlet Cooper pairs can be converted to triplet pairs,
+and topological superconductors can be realized. For their applications, the
+controllability of noncollinear magnetism is a crucial issue. Here, we propose
+that a supercurrent can induce and control noncollinear magnetic orders in a
+correlated metal on top of a singlet superconductor. We show that the magnetic
+instability in the correlated metal is enhanced by the proximity effect of
+supercurrents, which leads to phase transitions from a paramagnetic state to
+noncollinear magnetic phases with helical or vortexlike spin textures.
+Furthermore, these magnetic orders can be switched by the direction of the
+supercurrent. We also discuss the effect of the Rashba spin-orbit coupling and
+the experimental realization.",1710.11349v2
+2017-12-15,Molecular Tuning of the Magnetic Response in Organic Semiconductors,"The tunability of high-mobility organic semi-conductors (OSCs) holds great
+promise for molecular spintronics. In this study, we show this extreme
+variability - and therefore potential tunability - of the molecular
+gyromagnetic coupling (""g-"") tensor with respect to the geometric and
+electronic structure in a much studied class of OSCs. Composed of a structural
+theme of phenyl- and chalcogenophene (group XVI element containing,
+five-membered) rings and alkyl functional groups, this class forms the basis of
+several intensely studied high-mobility polymers and molecular OSCs. We show
+how in this class the g-tensor shifts, $\Delta g$, are determined by the
+effective molecular spin-orbit coupling (SOC), defined by the overlap of the
+atomic spin-density and the heavy atoms in the polymers. We explain the
+dramatic variations in SOC with molecular geometry, chemical composition,
+functionalization, and charge life-time using a first-principles theoretical
+model based on atomic spin populations. Our approach gives a guide to tuning
+the magnetic response of these OSCs by chemical synthesis.",1712.05620v1
+2017-12-21,Spin-triplet paired phases inside ferromagnet induced by Hund's rule coupling and electronic correlations: Application to $\mathrm{UGe}_2$,"We discuss a mechanism of real-space spin-triplet pairing, alternative to
+that due to quantum paramagnon excitations, and demonstrate its applicability
+to $\mathrm{UGe_2}$. Both the Hund's rule ferromagnetic exchange and
+inter-electronic correlations contribute to the same extent to the equal-spin
+pairing, particularly in the regime in which the weak-coupling solution does
+not provide any. The theoretical results, obtained within the
+orbitally-degenerate Anderson lattice model, match excellently the observed
+phase diagram for $\mathrm{UGe_2}$ with the coexistent ferromagnetic (FM1) and
+superconducting ($A_1$-type) phase. Additionally, weak $A_2$- and $A$-type
+paired phases appear in very narrow regions near the metamaganetic (FM2
+$\rightarrow$ FM1) and FM1 $\rightarrow$ paramagnetic first-order
+phase-transition borders, respectively. The values of magnetic moments in the
+FM2 and FM1 states are also reproduced correctly in a semiquantitative manner.
+The Hund's metal regime is also singled out as appearing near FM1-FM2 boundary.",1712.08028v2
+2019-09-16,Quantum anomalous Hall effect in two dimensional Janus Mn2Cl3Br3 with large magnetic anisotropy energy,"The quantum anomalous Hall (QAH) effect have been experimentally observed in
+magnetically-doped topological insulators. However, the QAH effect only at
+extremely low temperatures due to the weak magnetic coupling, small band gap
+and low carrier mobility. Here, based on first-principles density functional
+theory, we predict that the Janus Mn2Cl3Br3 is high Curie temperature
+ferromagnet that host the QAH phase. Furthermore, we find that it is a Dirac
+half-metal characterized by a Dirac cone in one spin channel with carrier
+mobilities comparable to freestanding germanene and an large band gap in other
+spin channel. Simultaneously, when the spin-orbital coupling interaction is
+considered, the Janus Mn2Cl3Br3 exhibit lager magnetic anisotropic energy of
+11.89 meV/cell and a nontrivial band gap. More interestingly, both the Chern
+number sign and the chiral edge current are tuned by changing the direction of
+magnetization. Our finding would suggest the possibility of not only realized
+the QAH effect but also designed the flow direction of the edge current.",1909.07812v2
+2018-06-25,Stripe order and magnetic anisotropy in the $S=1$ antiferromagnet BaMoP$_2$O$_8$,"Magnetic behavior of BaMoP$_2$O$_8$ with the spatially anisotropic triangular
+arrangement of the $S=1$ Mo$^{4+}$ ions is explored using thermodynamic
+measurements, neutron diffraction, and density-functional band-structure
+calculations. A broad maximum in the magnetic susceptibility around 46\,K is
+followed by the stripe antiferromagnetic order with the propagation vector
+${\mathbf k}=(\frac{1}{2},\frac{1}{2},\frac{1}{2})$ formed below $T_N\simeq 21$
+K. This stripe phase is triggered by a pronounced one-dimensionality of the
+spin lattice, where one of the in-plane couplings, $J_2\simeq 4.6$ meV, is much
+stronger than its $J_1\simeq 0.4$ meV counterpart, and stabilized by the weak
+easy-axis anisotropy. The ordered moment of 1.42(9) $\mu_B$ at 1.5 K is
+significantly lower than the spin-only moment of 2 $\mu_B$ due to a combined
+effect of quantum fluctuations and spin-orbit coupling.",1806.09314v2
+2018-12-28,Enhanced fermion pairing and superfluidity by an imaginary magnetic field,"We show that an imaginary magnetic field(IMF), which can be generated in
+non-Hermitian systems with spin-dependent dissipations, can greatly enhance the
+s-wave pairing and superfluidity of spin-1/2 fermions, in distinct contrast to
+the effect of a real magnetic field. The enhancement can be attributed to the
+increased coupling constant in low-energy space and the reduced spin gap in
+forming singlet pairs. We have demonstrated this effect in a number of
+different fermion systems with and without spin-orbit coupling, using both the
+two-body exact solution and many-body mean-field theory. Our results suggest an
+alternative route towards strong fermion superfluid with high superfluid
+transition temperature.",1812.11008v2
+2019-01-22,Magnetic stripe soliton and localized stripe wave in spin-1 Bose-Einstein condensates,"The recent experimental realization of spin-orbit coupling for ultracold
+atomic gases opens a new avenue for engineering solitons with internal spatial
+structures through tuning atomic band dispersions. However, the types of the
+resulting stripe solitons in a spin-1/2 Bose-Einstein condensate (BEC) have
+been limited to dark-dark or bright-bright with the same density profiles for
+different spins. Here we propose that general types of stripe solitons,
+including magnetic stripe (e.g., dark-bright) and localized stripe waves
+(neither bright nor dark), could be realized in a spin-1 BEC with widely
+tunable band dispersions through modulating the coupling between three spin
+states and the linear momentum of atoms. \ Surprisingly, a moving magnetic
+stripe soliton can possess both negative and positive effective masses at
+different velocities, leading to a zero mass soliton at certain velocity. Our
+work showcases the great potential of realizing novel types of solitons through
+band dispersion engineering, which may provide a new approach for exploring
+soliton physics in many physical branches.",1901.07631v2
+2016-03-15,Colossal Magnetocapacitance Effect and Multiferroism of Polycrystalline La0.2Pb0.7Fe12O19,"The mutual control of the electric and magnetic properties of a multiferroic
+solid is of fundamental and great technological importance. We report here on
+the colossal magnetoelectric coupling effect of polycrystalline
+La0.2Pb0.7Fe12O19. A large classic ferroelectric hysteresis loop with full
+saturation and a strong magnetic hysteresis loop were observed simultaneously
+in polycrystalline La0.2Pb0.7Fe12O19 due to the coexistence of an off-centered
+FeO6 octahedron in its unit cell and electron spins in the partially filled 3d
+orbits of the Fe3+ ions. The coupling voltage and capacity demonstrate giant
+oscillations, along with magnetic field; the maximum magnetocapacitance ratio
+exceeds 1.9E5 at 80 Hz. The substitution of La ions with Pb ions progressively
+stabilized the conical spin structure, which gave rise to the spin-current
+induced capacity oscillations upon magnetic field.",1603.04508v1
+2016-12-22,Excitonic magnetism in $d^6$ perovskites,"We use the LDA+U method to study the possibility of exciton condensation in
+perovskites of transition metals with $d^6$ electronic configuration such as
+LaCoO$_3$. For realistic interaction parameters we find several distinct
+solutions exhibiting spin-triplet exciton condensate, which gives rise to a
+local spin density distribution while the ordered moments are vanishingly
+small. Rhombohedral distortion from the ideal cubic structure suppresses the
+ordered state, contrary to the spin-orbit coupling which enhances the excitonic
+condensation energy. We explain the trends observed in the numerical
+simulations with the help of a simplified strong-coupling model. Our results
+indicate that LaCoO$_3$ is close to the excitonic instability and suggest ways
+to make it order.",1612.07576v2
+2020-06-10,Strongly parity-mixed superconductivity in Rashba-Hubbard model,"Heterostructures containing strongly correlated electron systems provide a
+platform to clarify interplay of electron correlation and Rashba spin-orbit
+coupling in unconventional superconductors. Motivated by recent fabrication of
+artificially-engineered heavy fermion superlattices and high-temperature
+cuprate superconductors, we conduct a thorough study on superconductivity in
+Rashba-Hubbard model. In contrast to previous weak coupling approaches, we
+employ fluctuation-exchange approximation to describe quantum critical magnetic
+fluctuations and resulting superconductivity. As a result, robust Fermi
+surfaces against magnetic fluctuations, incommensurate spin fluctuations, and a
+strongly parity-mixed superconducting phase are demonstrated in a wide range of
+electron filling from type-II van Hove singularity to half-filling. We also
+clarify impacts of type-II van Hove singularity on magnetic fluctuations and
+superconductivity. Whereas the $d_{x^2-y^2}$-wave pairing always dominant,
+subdominant spin-triplet pairing with either $p$-wave or $f$-wave symmetry
+shows a comparable magnitude, especially near the type-II van Hove singularity.
+Our results resolve unsettled issues on strongly correlated Rashba systems and
+uncover candidate systems of nonreciprocal transport and topological
+superconductivity.",2006.05952v1
+2021-05-26,Symmetry invariants and classes of quasi-particles in magnetically ordered systems having weak spin-orbit coupling,"Symmetry invariants of a group specify the classes of quasiparticles, namely
+the classes of projective irreducible \emph{co-representations} (irReps) in
+systems having that symmetry. More symmetry invariants exist in discrete point
+groups than the full rotation group $\mathrm{O(3)}$, leading to new
+quasiparticles restricted to lattices that have not any counterpart in vacuum.
+We focus on the fermionic quasiparticle excitations under ``spin-space group''
+symmetries, applicable to materials where long-range magnetic structure and
+itinerant electrons coexist. We provide a list of 218 classes of new
+quasiparticles with symmetry group $P\times Z_2^T$ (with $P$ a crystallographic
+point group) that can \emph{only} be realized in the spin-space groups, and
+then prove a theorem that each of these new types of quasiparticles has unique
+physical properties in terms of the dispersion and the coupling to external
+probe fields.",2105.12738v4
+2022-08-29,Determining Kitaev interaction in spin-$S$ honeycomb Mott insulators,"The Kitaev interaction in a honeycomb lattice with higher-spin $S$ has been
+one of the central attractions, as it may offer quantum spin liquids. A
+microscopic theory showed that when the Hund's coupling at the transition metal
+generates $S> \frac{1}{2}$, the spin-orbit coupling at the heavy ligands
+provides a route to the Kitaev interaction. However, there have been debates
+over its strength compared to other symmetry-allowed interactions.
+Investigating the symmetry of the Hamiltonian for general $S$, we show the
+magnon energies at two momentum points related by a broken mirror symmetry
+reflect the Kitaev interaction when a magnetic field is in the mirror plane.
+Applying the symmetry analysis to CrI$_3$ with $S=\frac{3}{2}$ together with
+the available angle-dependent ferromagnetic resonance data, we estimate the
+Kitaev interaction out of the full Hamiltonian and find that it is
+sub-dominant. Our theory can be tested by inelastic neutron scattering on
+candidate materials under the proposed magnetic field direction, which will
+advance the search for general $S$ Kitaev materials.",2208.13807v2
+2022-11-03,Magnetism in Two-Dimensional Ilmenenes: Intrinsic Order and Strong Anisotropy,"Iron ilmenene is a new two-dimensional material that has recently been
+exfoliated from the naturally-occurring iron titanate found in ilmenite ore, a
+material that is abundant on earth surface. In this work, we theoretically
+investigate the structural, electronic and magnetic properties of 2D
+transition-metal-based ilmenene-like titanates. The study of magnetic order
+reveals that these ilmenenes usually present intrinsic antiferromagnetic
+coupling between the 3d magnetic metals decorating both sides of the Ti-O
+layer. Furthermore, the ilmenenes based on late 3d brass metals, such as
+CuTiO$_3$ and ZnTiO$_3$, become ferromagnetic and spin compensated,
+respectively. Our calculations including spin-orbit coupling reveal that the
+magnetic ilmenenes have large magnetocrystalline anisotropy energies when the
+3d shell departs from being either filled or half-filled, with their spin
+orientation being out-of-plane for elements below half-filling of 3d states and
+in-plane above. These interesting magnetic properties of ilmenenes make them
+useful for future spintronic applications because they could be synthesized as
+already realized in the iron case.",2211.01732v1
+2024-02-27,Expansion dynamics of Bose-Einstein condensates in a synthetic magnetic field,"We investigate the expansion dynamics of spin-orbit-coupled Bose-Einstein
+condensates subjected to a synthetic magnetic field, after their release from
+an external harmonic trap. Our findings reveal that the condensate experiences
+a spin-dependent rotation and separation due to the rigid-like rotational
+velocity field, which leads to a spin density deflection. The deflection angle
+reaches a peak at a time that is inversely related to the frequency of the
+harmonic trap. When the detuning gradient is below a critical value for vortex
+nucleation, our analytical results derived from a spinor hydrodynamic theory
+align closely with numerical results using the coupled Gross-Pitaevskii
+equations. Beyond this critical value, we also numerically simulated the
+expansion dynamics of the condensates containing vortices with negative
+circulation. Our findings highlight the pivotal role of the rigid-like
+rotational velocity field on the dynamics of the condensate and may stimulate
+further experimental investigations into the rich superfluid dynamics induced
+by synthetic magnetic fields.",2402.17691v1
+2024-02-28,Cotunneling effects in the geometric statistics of a nonequilibrium spintronic junction,"In the nonequilibrium steadystate of electronic transport across a
+spin-resolved quantronic junction, we investigate the role of cotunneling on
+the emergent statistics under phase-different adiabatic modulation of the
+reservoirs' chemical potentials. By explicitly identifying the sequential and
+inelastic cotunneling rates, we numerically evaluate the geometric or
+Pancharatnam-Berry contributions to the spin exchange flux. We identify the
+relevant conditions wherein the sequential and cotunneling processes compete
+and selectively influence the total geometric flux upshot. The Fock space
+coherences are found to suppress the cotunneling effects when the system
+reservoir couplings are comparable. The cotunneling contribution to the total
+geometric flux can be made comparable to the sequential contribution by
+creating a rightsided asymmetry in the system-reservoir coupling strength.
+Using a recently proposed geometric thermodynamic uncertainty relationship, we
+numerically estimate the total rate of minimal entropy production. The
+geometric flux and the minimum entropy are found to be nonlinear as a function
+of the interaction energy of the junction's spin orbitals.",2402.18283v1
+2006-10-19,Gap-mediated magnetization of a pseudo-one-dimensional system with a spin-orbit interaction,"We argue that a pseudo-one-dimensional electron gas is magnetized when a
+voltage bias is applied with the Fermi level tuned to be in the energy gap
+generated by a spin-orbit interaction. The magnetization is an indication of
+spin-carrying currents due to the spin-orbit interaction. The origin of the
+magnetization, however, is essentially different from the ""spin accumulation""
+in two-dimensional systems with spin-orbit interactions.",0610531v1
+2007-10-29,Electron-electron and spin-orbit interactions in armchair graphene ribbons,"The effects of intrinsic spin-orbit and Coulomb interactions on low-energy
+properties of finite width graphene armchair ribbons are studied by means of a
+Dirac Hamiltonian. It is shown that metallic states subsist in the presence of
+intrinsic spin-orbit interactions as spin-filtered edge states, in contrast
+with the insulating behavior predicted for graphene planes. A charge-gap opens
+due to Coulomb interactions in neutral ribbons, that vanishes as $\Delta\sim
+1/W $, with a gapless spin sector. Weak intrinsic spin-orbit interactions do
+not change the insulating behavior. Explicit expressions for the
+width-dependent gap and various correlation functions are presented.",0710.5405v1
+2014-03-27,Spin-orbit effects in armchair carbon nanotubes: analytical results,"Energy spectra and transport properties of armchair nanotubes with curvature
+induced spin-orbit interaction are investigated thoroughly. The spin-orbit
+interaction consists of two terms: the first one preserves the spin symmetry in
+rotating frame, while the second one breaks it. It is found that the both terms
+are equally important: i)at scattering on the potential step which mimics a
+long-range potential in the nanotubes; ii)at transport via nanotube quantum
+dots. It is shown that an armchair nanotube with the first spin-orbit term
+works as an ideal spin-filter, while the second term produces a parasitic
+inductance.",1403.7070v1
+2010-07-20,Quantum criticality of vanadium chains with strong relativistic spin-orbit interaction,"We study quantum phase transitions induced by the on-site spin-orbit
+interaction lambda(L.S) in a toy model of vanadium chains. In the lambda->0
+limit, the decoupled spin and orbital sectors are described by a Haldane and an
+Ising chain, respectively. The gapped ground state is composed of a
+ferro-orbital order and a spin liquid with finite correlation lengths. In the
+opposite limit, strong spin-orbital entanglement results in a simultaneous spin
+and orbital-moment ordering, which can be viewed as an orbital liquid. Using a
+combination of analytical arguments and density-matrix renormalization group
+calculation, we show that an intermediate phase, where the ferro-orbital state
+is accompanied by a spin Neel order, is bounded on both sides by Ising
+transition lines. Implications for vanadium compounds CaV2O4 and ZnV2O4 are
+also discussed.",1007.3472v3
+2022-04-27,Hidden interplay of current-induced spin and orbital torques in bulk Fe$_3$GeTe$_2$,"Low crystal symmetry of magnetic van der Waals materials naturally promotes
+spin-orbital complexity unachievable in common magnetic materials used for
+spin-orbit torque switching. Here, using first-principles methods, we
+demonstrate that an interplay of spin and orbital degrees of freedom has a
+profound impact on spin-orbit torques in a prototype van der Waals ferromagnet:
+Fe$_3$GeTe$_2$ (FGT). While we show that bulk FGT hosts strong ""hidden""
+current-induced torques harvested by each of its layers, we uncover that their
+origin alternates between the conventional spin flux torque and the so-called
+orbital torque as the magnetization direction is varied. A drastic difference
+in the behavior of the two types of torques results in a non-trivial evolution
+of switching properties with doping. Our findings promote the design of
+non-equilibrium orbital properties as the guiding mechanism for crafting the
+properties of spin-orbit torques in layered van der Waals materials.",2204.13052v3
+2004-01-29,Correlated two-pion exchange and large-N(C) behavior of nuclear forces,"The effect of correlated scalar-isoscalar two-pion exchange (CrTPE) modes is
+considered in connection with central and spin-orbit parts of the NN force. The
+two-pion correlation function is coupled directly to the scalar form factor of
+the nucleon which we calculate in the large-N(C) limit where the nucleon can be
+described as a soliton of an effective chiral theory. The results for the
+central NN force show a strong repulsive core at short internucleon distances
+supplemented by a moderate attraction beyond 1 fm. The long-range tail of the
+central NN potential is driven by the the pion-nucleon sigma term and
+consistent with the effective $\sigma$ meson exchange. The spin-orbit part of
+the NN potential is repulsive. The large-N(C) scaling behavior of the
+scalar-isoscalar NN interaction is addressed. We show that the spin-orbit part
+is O(1/N^2(C)) in strength relative to the central force resulting in the ratio
+$\simeq 1/9$ suggested by the 1/N(C) expansion for N(C)=3. The latter is in
+agreement with our numerical analysis and with the Kaplan-Manohar large-N(C)
+power counting. Unitarization of the $\pi \pi$ scattering amplitude plays here
+an important role and improves the tree level results. Analytical
+representations of the CrTPE NN potential in terms of elementary functions are
+derived and their chiral content is discussed.",0401061v3
+2008-02-06,Tight-binding electronic spectra on graphs with spherical topology. II. The effect of spin-orbit interaction,"This is the second of two papers devoted to tight-binding electronic spectra
+on graphs with the topology of the sphere. We investigate the problem of an
+electron subject to a spin-orbit interaction generated by the radial electric
+field of a static point charge sitting at the center of the sphere. The
+tight-binding Hamiltonian considered is a discretization on polyhedral graphs
+of the familiar form ${\bm L}\cdot{\bm S}$ of the spin-orbit Hamiltonian. It
+involves SU(2) hopping matrices of the form $\exp({\rm i}\mu{\bm
+n}\cdot{\bm\sigma})$ living on the oriented links of the graph. For a given
+structure, the dimensionless coupling constant $\mu$ is the only parameter of
+the model. An analysis of the energy spectrum is carried out for the five
+Platonic solids (tetrahedron, cube, octahedron, dodecahedron and icosahedron)
+and the C$_{60}$ fullerene. Except for the latter, the $\mu$-dependence of all
+the energy levels is obtained analytically in closed form. Rather unexpectedly,
+the spectra are symmetric under the exchange $\mu\leftrightarrow\Theta-\mu$,
+where $\Theta$ is the common arc length of the links. For the symmetric point
+$\mu=\Theta/2$, the problem can be exactly mapped onto a tight-binding model in
+the presence of the magnetic field generated by a Dirac monopole, studied
+recently. The dependence of the total energy at half filling on $\mu$ is
+investigated in all examples.",0802.0795v2
+2013-11-04,Carrier localization and electronic phase separation in a doped spin-orbit driven Mott phase in Sr3(Ir1-xRux)2O7,"Interest in many strongly spin-orbit coupled 5d-transition metal oxide
+insulators stems from mapping their electronic structures to a J=1/2 Mott
+phase. One of the hopes is to establish their Mott parent states and explore
+these systems' potential of realizing novel electronic states upon carrier
+doping. However, once doped, little is understood regarding the role of their
+reduced Coulomb interaction U relative to their strongly correlated 3d-electron
+cousins. Here we show that, upon hole-doping a candidate J=1/2 Mott insulator,
+carriers remain localized within a nanoscale phase separated ground state. A
+percolative metal-insulator transition occurs with interplay between localized
+and itinerant regions, stabilizing an antiferromagnetic metallic phase beyond
+the critical region. Our results demonstrate a surprising parallel between
+doped 5d- and 3d-electron Mott systems and suggest either through the near
+degeneracy of nearby electronic phases or direct carrier localization that U is
+essential to the carrier response of this doped spin-orbit Mott insulator.",1311.0783v2
+2014-11-01,Quantum Čerenkov Radiation: Spectral Cutoffs and the Role of Spin and Orbital Angular Momentum,"We show that the well-known \v{C}erenkov Effect contains new phenomena
+arising from the quantum nature of charged particles. The \v{C}erenkov
+transition amplitudes allow coupling between the charged particle and the
+emitted photon through their orbital angular momentum (OAM) and spin, by
+scattering into preferred angles and polarizations. Importantly, the spectral
+response reveals a discontinuity immediately below a frequency cutoff that can
+occur in the optical region. Specifically, with proper shaping of electron
+beams (ebeams), we predict that the traditional \v{C}erenkov radiation angle
+splits into two distinctive cones of photonic shockwaves. One of the shockwaves
+can move along a backward cone, otherwise considered impossible for
+\v{C}erenkov radiation in ordinary matter. Our findings are observable for
+ebeams with realistic parameters, offering new applications including novel
+quantum optics sources, and open a new realm for \v{C}erenkov detectors
+involving the spin and orbital angular momentum of charged particles.",1411.0083v2
+2015-06-08,Demonstration of Optimal Control of Laser Induced Spin-Orbit Mediated Ultrafast Demagnetization,"Laser induced ultrafast demagnetization is the process whereby the magnetic
+moment of a ferromagnetic material is seen to drop significantly on a timescale
+of $10-100$s of femtoseconds due to the application of a strong laser pulse. If
+this phenomenon can be harnessed for future technology, it offers the
+possibility for devices operating at speeds several orders of magnitude faster
+than at present. A key component to successful transfer of such a process to
+technology is the controllability of the process, i.e. that it can be tuned in
+order to overcome the practical and physical limitations imposed on the system.
+In this paper, we demonstrate that the spin-orbit mediated form of ultrafast
+demagnetization recently investigated [arXiv:1406.6607] by ab-initio
+time-dependent density functional theory (TDDFT) can be controlled. To do so we
+use quantum optimal control theory (OCT) to couple our TDDDT simulations to the
+optimization machinery of OCT. We show that a laser pulse can be found which
+maximizes the loss of moment within a given time interval while subject to
+several practical and physical constraints. Furthermore we also include a
+constraint on the fluence of the laser pulses and find the optimal pulse that
+combines significant demagnetization with a desire for less powerful pulses.
+These calculations demonstrate optimal control is possible for spin-orbit
+mediated ultrafast demagnetization and lay the foundation for future
+optimizations/simulations which can incorporate even more constraints.",1506.02332v1
+2016-04-26,A pedagogic review on designing model topological insulators,"Following the centuries old concept of the quantization of flux through a
+Gaussian curvature (Euler characteristic) and its successive dispersal into
+various condensed matter properties such as quantum Hall effect, and
+topological invariants, we can establish a simple and fairly universal
+understanding of various modern topological insulators (TIs). Formation of a
+periodic lattice (which is a non-trivial Gaussian curvature) of 'cyclotron
+orbits' with applied magnetic field, or 'chiral orbits' with fictitious
+'momentum space magnetic field' (Berry curvature) guarantees its flux
+quantization, and thus integer quantum Hall (IQH), and quantum spin-Hall (QSH)
+insulators, respectively, occur. The bulk-boundary correspondence associated
+with all classes of TIs dictates that some sort of pumping or polarization of a
+'quantity' at the boundary must be associated with the flux quantization or
+topological invariant in the bulk. Unlike charge or spin polarizations at the
+edge for IQH and QSH states, the time-reversal (TR) invariant Z2 TIs pump a
+mathematical quantity called 'TR polarization' to the surface. This requires
+that the valence electron's wavefunction (say, {\psi}_{\uparrow} (k)) switches
+to its TR conjugate ({\psi}_{\downarrow}^* (-k)) odd number of times in half of
+the Brillouin zone. These two universal features can be considered as 'targets'
+to design and predict various TIs. For example, we demonstrate that when two
+adjacent atomic chains or layers are assembled with opposite spin-orbit
+coupling (SOC), serving as the TR partner to each other, the system naturally
+becomes a Z2 TI. This review delivers a holistic overview on various concepts,
+computational schemes, and engineering principles of TIs.",1604.07546v1
+2018-01-31,SU(4)-symmetric spin-orbital liquids on the hyperhoneycomb lattice,"We study the effective spin-orbital model that describes the magnetism of
+4$d^1$ or 5$d^1$ Mott insulators in ideal tricoordinated lattices. In the limit
+of vanishing Hund's coupling, the model has an emergent SU(4) symmetry which is
+made explicit by means of a Klein transformation on pseudospin degrees of
+freedom. Taking the hyperhoneycomb lattice as an example, we employ parton
+constructions with fermionic representations of the pseudospin operators to
+investigate possible quantum spin-orbital liquid states. We then use
+variational Monte Carlo (VMC) methods to compute the energies of the projected
+wave functions. Our numerical results show that the lowest-energy quantum
+liquid corresponds to a zero-flux state with a Fermi surface of four-color
+fermionic partons. In spite of the Fermi surface, we demonstrate that this
+state is stable against tetramerization. A combination of linear flavor wave
+theory and VMC applied to the complete microscopic model also shows that this
+liquid state is stable against the formation of collinear long-range order.",1802.00044v3
+2017-04-21,Time- and spatially-resolved magnetization dynamics driven by spin-orbit torques,"Current-induced spin-orbit torques (SOTs) represent one of the most effective
+ways to manipulate the magnetization in spintronic devices. The orthogonal
+torque-magnetization geometry, the strong damping, and the large domain wall
+velocities inherent to materials with strong spin-orbit coupling make SOTs
+especially appealing for fast switching applications in nonvolatile memory and
+logic units. So far, however, the timescale and evolution of the magnetization
+during the switching process have remained undetected. Here, we report the
+direct observation of SOT-driven magnetization dynamics in Pt/Co/AlO$_x$ dots
+during current pulse injection. Time-resolved x-ray images with 25 nm spatial
+and 100 ps temporal resolution reveal that switching is achieved within the
+duration of a sub-ns current pulse by the fast nucleation of an inverted domain
+at the edge of the dot and propagation of a tilted domain wall across the dot.
+The nucleation point is deterministic and alternates between the four dot
+quadrants depending on the sign of the magnetization, current, and external
+field. Our measurements reveal how the magnetic symmetry is broken by the
+concerted action of both damping-like and field-like SOT and show that
+reproducible switching events can be obtained for over $10^{12}$ reversal
+cycles.",1704.06402v1
+2014-05-04,Magnetic braking of Ap/Bp stars: an alternative formation mechanism of compact intermediate-mass binary pulsars,"It is difficult for the intermediate-mass X-ray binaries (IMXBs) evolutionary
+channel to form intermediate-mass binary pulsars (IMBPs) with a short orbital
+period (less than 3 d) via stable mass transfer. The main reason is that the
+magnetic braking mechanisms are generally thought not to work for donor stars
+with a mass of greater than 1.5 $\rm M_{\odot}$ in the canonical model.
+However, some intermediate-mass stars have anomalously strong magnetic fields
+(about 100 -- 10000 G), i. e. so-called Ap or Bp stars. With the coupling
+between the magnetic field and the irradiation-driven wind from the surface of
+Ap/Bp stars, a plausible magnetic braking mechanism should be expected. In this
+work, we attempt to investigate if IMXBs with Ap/Bp stars can produce IMBPs
+with a short orbital period (less than 3 d) by such an anomalous magnetic
+braking mechanism. Using a stellar evolution code, we have simulated the
+evolution of a large number of IMXBs consisting of a NS and an Ap/Bp star. For
+the spin evolution of the NS, we consider the accretion torque, the propeller
+torque, and the spin-down torque caused by the interaction between the magnetic
+field and the accretion disc. The calculated results show that, employing
+anomalous magnetic braking of Ap/Bp stars, IMXBs can evolve into compact IMBPs
+with short orbital periods of less than 3 d. However, there exists significant
+discrepancy between the spin periods of IMBPs in our simulated results and
+those observed.",1405.0691v1
+2018-03-20,Interaction-driven spin-orbit effects and Chern insulating phases in corundum-based $4d$ and $5d$ oxide honeycomb lattices,"Using density functional theory calculations with a Hubbard $U$, we explore
+topologically nontrivial phases in $X_2$O$_3$ honeycomb layers with $X=$ $4d$
+and $5d$ cation inserted in the band insulator $\alpha$-Al$_2$O$_3$ along the
+[0001]-direction. Several promising candidates for quantum anomalous Hall
+insulators (QAHI) are identified. In particular, for $X$=Tc and Pt spin-orbit
+coupling (SOC) opens a gap of 54 and 59 meV, respectively, leading to Chern
+insulators (CI) with $C$=--2 and --1. The nature of different Chern numbers is
+related to the corresponding spin textures. The Chern insulating phase is
+sensitive to the Coulomb repulsion strength: $X$=Tc undergoes a transition from
+a CI to a trivial metallic state beyond a critical strength of $U_c$ =2.5 eV. A
+comparison between the isoelectronic metastable FM phases of $X$=Pd and Pt
+emphasizes the intricate balance between electronic correlations and SOC: while
+the former is a trivial insulator, the latter is a Chern insulator. In
+addition, $X$=Os turns out to be a FM Mott insulator with an unpaired electron
+in the $t_{2g}$ manifold where SOC induces an unusually high orbital moment of
+0.34 $\mu_{\rm B}$ along the $z$-axis. Parallels to the $3d$ honeycomb corundum
+cases are discussed.",1803.07392v2
+2018-07-25,A new paradigm for the quantum spin Hall effect at high temperatures,"The quantum spin Hall effect (QSHE) has formed the seed for contemporary
+research on topological quantum states of matter. Since its discovery in
+HgTe/CdTe quantum wells and AlGaAs/GaAs heterostructures, all such systems have
+so far been suffering from extremely low operating temperatures, rendering any
+technological application out of reach. We formulate a theoretical paradigm to
+accomplish the high temperature QSHE in monolayer-substrate heterostructures.
+Specifically, we explicate our proposal for hexagonal compounds formed by
+monolayers of heavy group-V elements (As, Sb, Bi) on a SiC substrate. We show
+how orbital filtering due to substrate hybridization, a tailored multi-orbital
+density of states at low energies, and large spin-orbit coupling can conspire
+to yield QSH states with bulk gaps of several hundreds of meV. Combined with
+the successful realization of Bi/SiC (0001), with a measured bulk gap of 800
+meV reported previously [Reis et al., 10.1126/science.aai8142 (2017)], our
+paradigm elevates the QSHE from an intricate quantum phenomenon at low
+temperatures to a scalable effect amenable to device design and engineering.",1807.09552v1
+2020-05-06,The Dirac oscillator: an alternative basis for nuclear structure calculations,"Background: The isotropic harmonic oscillator supplemented by a strong
+spin-orbit interaction has been the cornerstone of nuclear structure since its
+inception more than seven decades ago. In this paper we introduce---or rather
+re-introduced---the ""Dirac Oscillator"", a fully relativistic basis that has all
+the desired attributes of the ordinary harmonic oscillator while naturally
+incorporating a strong spin-orbit coupling.
+  Purpose: To assess---to our knowledge for the first time---the power and
+flexibility of the Dirac Oscillator basis in the solution of nuclear structure
+problems within the framework of covariant density functional theory.
+  Methods: Self-consistent calculations of binding energies and ground-state
+densities for a selected set of doubly-magic magic are performed using the
+Dirac-oscillator basis and are then compared against results obtained with the
+often-used Runge-Kutta method.
+  Results: Results obtained using the Dirac oscillator basis reproduced with
+high accuracy those derived using the Runge-Kutta method and suggest a clear
+path for a generalization to systems with axial symmetry.
+  Conclusions: Although the three-dimensional harmonic oscillator with
+spin-orbit corrections has been the staple of the nuclear shell model since the
+beginning, the Dirac oscillator is practically unknown among the nuclear
+physics community. In this paper we illustrate the power and flexibility of the
+Dirac oscillator and suggest extensions to the study of systems without
+spherical symmetry as required in constrained calculations of nuclear
+excitations.",2005.03134v1
+2021-04-28,Fragile topological insulators protected by rotation symmetry without spin-orbit coupling,"We present a series of models of three-dimensional rotation-symmetric fragile
+topological insulators in class AI (time-reversal symmetric and spin-orbit-free
+systems), which have gapless surface states protected by time-reversal ($T$)
+and $n$-fold rotation ($C_n$) symmetries ($n=2,4,6$). Our models are
+generalizations of Fu's model of a spinless topological crystalline insulator,
+in which orbital degrees of freedom play the role of pseudo-spins. We consider
+minimal surface Hamiltonian with $C_n$ symmetry in class AI and discuss
+possible symmetry-protected gapless surface states, i.e., a quadratic band
+touching and multiple Dirac cones with linear dispersion. We characterize
+topological structure of bulk wave functions in terms of two kinds of
+topological invariants obtained from Wilson loops: $\mathbb{Z}_2$ invariants
+protected by $C_n$ ($n=4,6$) and time-reversal symmetries, and
+$C_2T$-symmetry-protected $\mathbb{Z}$ invariants (the Euler class) when the
+number of occupied bands is two. Accordingly, our models realize two kinds of
+fragile topological insulators. One is a fragile $\mathbb{Z}$ topological
+insulator whose only nontrivial topological index is the Euler class that
+specifies the number of surface Dirac cones. The other is a fragile
+$\mathbb{Z}_2$ topological insulator having gapless surface states with either
+a quadratic band touching or four (six) Dirac cones, which are protected by
+time-reversal and $C_4$ ($C_6$) symmetries. Finally, we discuss the instability
+of gapless surface states against the addition of $s$-orbital bands and
+demonstrate that surface states are gapped out through hybridization with
+surface-localized $s$-orbital bands.",2104.13631v2
+2016-10-17,"Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic GeV4S8","The lacunar spinel GeV4S8 undergoes orbital and ferroelectric ordering at the
+Jahn-Teller transition around 30 K and exhibits antiferromagnetic order below
+about 14 K. In addition to this orbitally driven ferroelectricity, lacunar
+spinels are an interesting material class, as the vanadium ions form V4
+clusters representing stable molecular entities with a common electron
+distribution and a well-defined level scheme of molecular states resulting in a
+unique spin state per V4 molecule. Here we report detailed x-ray, magnetic
+susceptibility, electrical resistivity, heat capacity, thermal expansion, and
+dielectric results to characterize the structural, electric, dielectric,
+magnetic, and thermodynamic properties of this interesting material, which also
+exhibits strong electronic correlations. From the magnetic susceptibility, we
+determine a negative Curie-Weiss temperature, indicative for antiferromagnetic
+exchange and a paramagnetic moment close to a spin S = 1 of the V4 molecular
+clusters. The low-temperature heat capacity provides experimental evidence for
+gapped magnon excitations. From the entropy release, we conclude about strong
+correlations between magnetic order and lattice distortions. In addition, the
+observed anomalies at the phase transitions also indicate strong coupling
+between structural and electronic degrees of freedom. Utilizing dielectric
+spectroscopy, we find the onset of significant dispersion effects at the polar
+Jahn-Teller transition. The dispersion becomes fully suppressed again with the
+onset of spin order. In addition, the temperature dependencies of dielectric
+constant and specific heat possibly indicate a sequential appearance of orbital
+and polar order.",1610.05244v1
+2016-10-19,Structural evolution and electronic properties of (Sr1-xCax)2-yIrO4+z spin-orbit assisted insulators,"The effect of isoelectronic substitution within single crystals of
+(Sr1-xCax)2-yIrO4+z is explored. The nominal n=1 Ruddlesden-Popper phase with
+y=0, z=0 remains stable from x=0 until x=0.11, where the antiferromagnet
+spin-orbit Mott insulating state persists. An increase in the saturated moment
+is observed with increasing Ca-substitution, suggesting a modified coupling of
+the in-plane moments relative to the in-plane rotation of IrO6 octahedra.
+Beyond x=0.11, the x=1/4, y=0, z=1/2 structural phase Sr3CaIr2O9, consisting of
+a three-dimensional network of corner sharing octahedra, begins to intermix and
+eventually nucleates phase pure crystals at higher starting Ca-content. An
+insulating, nonmagnetic ground state is observed in this phase attributable to
+the J=0 state and is consistent with a recent powder study. At higher
+Ca-concentrations beyond x = 0.75, crystals begin to stabilize in the y=1/3,
+z=0 quasi one-dimensional Ca5Ir3O12 structure. The low temperature transport in
+this chain-based structure is well described via variable range hopping, and an
+antiferromagnetic ordering transition appears below T$_N=9$ K. Our data provide
+a detailed mapping of the electronic and structural properties accessible as
+the structural framework of the canonical spin orbit Mott insulator Sr2IrO4 is
+destabilized via isovalent chemical substitution.",1610.06055v1
+2020-09-11,Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx,"Isoelectronic substitution is an ideal tuning parameter to alter electronic
+states and correlations in iron-based superconductors. As this substitution
+takes place outside the conducting Fe planes, the electronic behaviour is less
+affected by the impurity scattering experimentally and relevant key electronic
+parameters can be accessed. In this short review, I present the experimental
+progress made in understanding the electronic behaviour of the nematic
+electronic superconductors, FeSe1-xSx. A direct signature of the nematic
+electronic state is in-plane anisotropic distortion of the Fermi surface
+triggered by orbital ordering effects and electronic interactions that result
+in multi-band shifts detected by ARPES. Upon sulphur substitution, the
+electronic correlations and the Fermi velocities decrease in the tetragonal
+phase. Quantum oscillations are observed for the whole series in ultra-high
+magnetic fields and show a complex spectra due to the presence of many small
+orbits. Effective masses associated to the largest orbit display non-divergent
+behaviour at the nematic end point (x~0.175(5)), as opposed to critical
+spin-fluctuations in other iron pnictides. Magnetotransport behaviour has a
+strong deviation from the Fermi liquid behaviour and linear T resistivity is
+detected at low temperatures inside the nematic phase, where scattering from
+low energy spin-fluctuations are likely to be present. The superconductivity is
+not enhanced in FeSe1-xSx and there are no divergent electronic correlations at
+the nematic end point. These manifestations indicate a strong coupling with the
+lattice in FeSe1-xSx and a pairing mechanism likely promoted by spin
+fluctuations.",2009.05523v1
+2022-01-15,Robust Dirac lines against Ge vacancy and possible spin-orbit Dirac points in nonsymmorphic HfGe0.92Te,"Looking for new materials with Dirac points has been a fascinating subject of
+research. Here we report the growth, crystal structure, and band structure of
+HfGe0.92Te single crystals, featuring three different types of Dirac points.
+HfGe0.92Te crystalizes in a nonsymmorphic tetragonal space group P4/nmm (No.
+129), having square Ge-atom plane with vacancies about 8%. Despite the
+vacancies on Ge site, the Dirac nodal line composed of conventional Dirac
+points vulnerable to spin-orbit coupling (SOC) is observed using angle-resolved
+photoemission spectroscopy, accompanied with the robust Dirac line protected by
+the nonsymmorphic symmetry against both SOC and vacancies. Specially,
+spin-orbit Dirac points (SDPs) originated from the surface formed under SOC are
+hinted to exist according to our experiments and calculations.
+Quasi-two-dimensional (quasi-2D) characters are observed and further confirmed
+by angular-resolved magnetoresistance. HfGe0.92Te is a good candidate to
+explore exotic topological phases or topological properties with three
+different types of Dirac points and a promising candidate to realize 2D SDPs.",2201.05833v1
+2022-06-09,Exchange interactions in $d^{5}$ Kitaev materials: From Na$_2$IrO$_3$ to $α$-RuCl$_3$,"We present an analytical study of the exchange interactions between
+pseudospin one-half $d^{5}$ ions in honeycomb lattices with edge-shared
+octahedra. Various exchange channels involving Hubbard U, charge-transfer
+excitations, and cyclic exchange are considered. Hoppings within $t_{2g}$
+orbitals as well as between $t_{2g}$ and $e_g$ orbitals are included. Special
+attention is paid to the trigonal crystal field $\Delta$ effects on the
+exchange parameters. The obtained exchange Hamiltonian is dominated by
+ferromagnetic Kitaev interaction K within a wide range of $\Delta$. It is found
+that a parameter region close to the charge-transfer insulator regime and with
+a small $\Delta$ is most promising to realize the Kitaev spin liquid phase. Two
+representative honeycomb materials Na$_2$IrO$_3$ and $\alpha$-RuCl$_3$ are
+discussed based on our theory. We have found that both materials share dominant
+ferromagnetic K and positive non-diagonal $\Gamma$ values. However, their
+Heisenberg J terms have opposite signs: AFM J>0 in Na$_2$IrO$_3$ and FM J<0 in
+$\alpha$-RuCl$_3$. This brings different magnetic fluctuations and results in
+their different magnetization behaviors and spin excitation spectra. Proximity
+to FM state due to the large FM J is emphasized in $\alpha$-RuCl$_3$. The
+differences between the exchange couplings of these two materials originate
+from the opposite $\Delta$ values, indicating that the crystal field can serve
+as an efficient control parameter to tune the magnetic properties of $d^{5}$
+spin-orbit Mott insulators.",2206.04326v1
+2022-09-18,Control of chiral orbital currents in a colossal magnetoresistance material,"Colossal magnetoresistance (CMR) is an extraordinary enhancement of the
+electric conductivity in the presence of a magnetic field. It is conventionally
+associated with a field-induced spin polarization, which drastically reduces
+spin scattering and thus electric resistance. However, ferrimagnetic Mn3Si2Te6
+is an intriguing exception to this rule: it exhibits a 7-order-of-magnitude
+reduction in ab-plane resistivity with a 13-Tesla anisotropy field which occur
+only when a magnetic polarization is avoided [1]. Here we report an exotic
+quantum state that is driven by ab-plane chiral orbital currents (COC) flowing
+along edges of MnTe6 octahedra. The c-axis orbital moments of ab-plane COC
+couple to the ferrimagnetic Mn spins to drastically increase the ab-plane
+conductivity (CMR) when an external magnetic field is aligned along the
+magnetic hard c-axis. Both the COC state and its CMR are extraordinarily
+susceptible to small DC currents exceeding a critical threshold, and a hallmark
+of this COC state is an exotic time-dependent, bistable switching mimicking a
+first-order melting transition. The control of the COC-enabled CMR and bistable
+switching offers a fundamentally new paradigm for quantum technologies.",2209.08672v1
+2022-11-21,Two-dimensional hourglass Weyl nodal loop in monolayer Pb(ClO$_{2}$)$_{2}$ and Sr(ClO$_{2}$)$_{2}$,"The hourglass fermions in solid-state materials have been attracting
+significant interest recently. However, realistic two-dimensional (2D)
+materials with hourglass-shaped band structures are still very scarce. Here,
+through the first-principles calculations, we identify the monolayer
+Pb(ClO$_{2}$)$_{2}$ and Sr(ClO$_{2}$)$_{2}$ materials as the new realistic
+materials platform to realize 2D hourglass Weyl nodal loop. We show that these
+monolayer materials possess an hourglass Weyl nodal loop circling around the
+$\Gamma$ point and Weyl nodal line on the Brillouin zone (BZ) boundary in the
+absence of spin-orbit coupling (SOC). Through the symmetry analysis, we
+demonstrate that the hourglass Weyl nodal loop and Weyl nodal line are
+protected by the nonsymmorphic symmetries, and are robust under the biaxial
+strains. When we include the SOC, a tiny gap will be opened in the hourglass
+nodal loop and nodal line, and the nodal line can be transformed into the
+spin-orbit Dirac points. Our results provide a new realistic material platform
+for studying the intriguing physics associated with the 2D hourglass Weyl nodal
+loop and spin-orbit Dirac points.",2211.11269v1
+2023-05-01,Atomically-precise engineering of spin-orbit polarons in a kagome magnetic Weyl semimetal,"Atomically-precise engineering of defects in topological quantum materials,
+which is essential for constructing new artificial quantum materials with
+exotic properties and appealing for practical quantum applications, remains
+challenging due to the hindrances in modifying complex lattice with atomic
+precision. Here, we report the atomically-precise engineering of the
+vacancy-localized spin-orbital polarons (SOP) in a kagome magnetic Weyl
+semimetal Co3Sn2S2, using scanning tunneling microscope. We achieve the
+step-by-step repairing of the selected vacancies, which results in the
+formation of artificial sulfur vacancy with elaborate geometry. We find that
+that the bound states localized around the vacancies experience a
+symmetry-dependent energy shift towards Fermi level with increasing vacancy
+size. Strikingly, as vacancy size increases, the localized magnetic moments of
+SOPs are tunable and ultimately extended to the negative magnetic moments
+resulting from spin-orbit coupling in the kagome flat band. These findings
+establish a new platform for engineering atomic quantum states in topological
+quantum materials, offering potential for kagome-lattice-based spintronics and
+quantum technologies.",2305.00824v2
+2005-05-21,Spin unrestricted linear scaling electronic structure theory and its application to magnetic carbon doped BN nanotubes,"We present an extension of density matrix based linear scaling electronic
+structure theory to incorporate spin degrees of freedom. When the spin
+multiplicity of the system can be predetermined, the generalization of the
+existing linear scaling methods to spin unrestricted cases is straightforward.
+However, without calculations it is hard to determine the spin multiplicity of
+some complex systems, such as, many magnetic nanostuctures, some inorganic or
+bioinorganic molecules. Here we give a general prescription to obtain the
+spin-unrestricted ground state of open shell systems. Our methods are
+implemented into the linear scaling trace-correcting density matrix
+purification algorithm. The numerical atomic orbital basis, rather than the
+commonly adopted Gaussian basis functions is used. The test systems include O2
+molecule, and magnetic carbon doped BN(5,5) and BN(7,6) nanotubes. Using the
+newly developed method, we find the magnetic moments in carbon doped BN
+nanotubes couple antiferromagnetically with each other. Our results suggest
+that the linear scaling spin-unrestricted trace-correcting purification method
+is very powerful to treat large magnetic systems.",0505528v2
+2002-03-01,Baryon resonances and strong QCD,"Light-baryon resonances (with u,d, and s quarks in the SU(3) classification)
+fall on Regge trajectories. When their squared masses are plotted against the
+intrinsic orbital angular momenta {\rm L}, $\Delta^*$'s with even and odd
+parity can be described by the same Regge trajectory. For a given {\rm L},
+nucleon resonances with spin {\rm S}=3/2 are approximately degenerate in mass
+with $\Delta$ resonances. To which total angular momentum {\rm L} and {\rm S}
+couple has no significant impact on the baryon mass. Nucleons with spin 1/2 are
+shifted in mass; the shift is - in units of squared masses - proportional to
+the component in the wave function which is antisymmetric in spin and flavor.
+Based on these observations, a new baryon mass formula is proposed which
+reproduces nearly all known baryon masses. It is shown that the masses are
+compatible with a quark-diquark picture while the richness of the
+experimentally known states require three particles to participate in the
+dynamics. This conflict is resolved by proposing that quarks polarize the QCD
+condensates and are surrounded by a polarization cloud shielding the color. A
+new interpretation of constituent quarks as colored quark clusters emerges;
+their interaction is responsible for the mass spectrum. Fast flavor exchange
+between the colored quark clusters exhausts the dynamical richness of the
+three-particle dynamics. The colored-quark-cluster model provides a mechanism
+in which the linear confinement potential can be traced to the increase of the
+volume in which the condensates are polarized. The quark-spin magnetic moment
+induces currents in the polarized condensates which absorb the quark-spin
+angular momentum: the proton spin is not carried by quark spins. The model
+provides a new picture of hybrids and glueballs.",0203002v1
+2009-09-13,"Quantum Transport in Ladder-Type Networks: Role of nonlinearity, topology and spin","We investigate quantum transport of electrons, phase solitons, etc. through
+mesoscopic networks of zero-dimensional quantum dots. Straight and circular
+ladders are chosen as networks with each coupled with three semi-infinite leads
+(with one incoming and the other two outgoing). Two transmission probabilities
+(TPs) as a function of the incident energy $\epsilon$ show a transition from
+anti-phase aperiodic to degenerate periodic spectra at the critical energy
+$\epsilon_c$ which is determined by a bifurcation point of the bulk energy
+dispersions. TPs of the circular ladder depend only on the parity of the
+winding number. Introduction of a single missing bond (MB) or missing step
+doubles the period of the periodic spectra at $\epsilon>\epsilon_c$ . Shift of
+the MB by lattice constant results in a striking switching effect at
+$\epsilon<\epsilon_c$. In the presence of the electric-field induced spin-orbit
+interaction (SOI), an obvious spin filtering occurs against the
+spin-unpolarized injection. Against the spin-polarized injection, on the other
+hand, the spin transport shows spin-flip (magnetization reversal) oscillations
+with respect to SOI. We also show a role of soliton in the context of its
+transport through the ladder networks.",0909.2401v1
+2011-04-05,Magnetic domain wall motion in a nanowire: depinning and creep,"The domain wall motion in a magnetic nanowire is examined theoretically in
+the regime where the domain wall driving force is weak and its competition
+against disorders is assisted by thermal agitations. Two types of driving
+forces are considered; magnetic field and current. While the field induces the
+domain wall motion through the Zeeman energy, the current induces the domain
+wall motion by generating the spin transfer torque, of which effects in this
+regime remain controversial. The spin transfer torque has two mutually
+orthogonal vector components, the adiabatic spin transfer torque and the
+nonadiabatic spin transfer torque. We investigate separate effects of the two
+components on the domain wall depinning rate in one-dimensional systems and on
+the domain wall creep velocity in two-dimensional systems, both below the
+Walker breakdown threshold. In addition to the leading order contribution
+coming from the field and/or the nonadiabatic spin transfer torque, we find
+that the adiabatic spin transfer torque generates corrections, which can be of
+relevance for an unambiguous analysis of experimental results. For instance, it
+is demonstrated that the neglect of the corrections in experimental analysis
+may lead to incorrect evaluation of the nonadiabaticity parameter. Effects of
+the Rashba spin-orbit coupling on the domain wall motion are also analyzed.",1104.0744v2
+2016-01-29,Giant edge spin accumulation in a symmetric quantum well with two subbands,"We have studied the edge spin accumulation in a high mobility two-dimensional
+electron gas formed in a symmetric well with two subbands. This study is
+strongly motivated by the recent experiment of Hernandez et al. [Phys. Rev. B
+{\bf 88}, 161305(R) (2013)] who demonstrated the spin accumulation near the
+edges of a bilayer symmetric GaAs structure in contrast to no effect in a
+single-layer configuration. The intrinsic mechanism of the spin-orbit
+interaction we consider arises from the coupling between two subband states of
+opposite parities. We obtain a parametrically large magnitude of the edge spin
+density for the two-subband sample as compared to the usual single-subband
+structure. We show that the presence of a gap in the system, i.e., the energy
+separation $\Delta$ between the two subband bottoms, changes drastically the
+picture of the edge spin accumulation. Thus one can easily proceed from the
+regime of weak spin accumulation to the regime of strong one by varying the
+Fermi energy (electron density) and/or $\Delta$. We estimate that by changing
+the gap $\Delta$ from zero up to $1\div 2$ K, the magnitude of the effect
+changes by three orders of magnitude. This opens up the possibility for the
+design of new spintronic devices.",1602.00026v2
+2020-07-16,Theory of the Inverse Faraday Effect due to the Rashba Spin-Oribt Interactions: Roles of Band Dispersions and Fermi Surfaces,"We theoretically study the inverse Faraday effect, i.e., the optical
+induction of spin polarization with circularly polarized light, by particularly
+focusing on effects of band dispersions and Fermi surfaces in crystal systems
+with the spin-orbit interaction (SOI). By numerically solving the
+time-dependent Schr\""odinger equation of a tight-binding model with the
+Rashba-type SOI, we reproduce the light-induced spin polarization proportional
+to $E_0^2/\omega^3$ where $E_0$ and $\omega$ are the electric-field amplitude
+and the angular frequency of light, respectively. This optical spin induction
+is attributed to dynamical magnetoelectric coupling between the light electric
+field and the electron spins mediated by the SOI. We elucidate that the
+magnitude and sign of the induced spin polarization sensitively depend on the
+electron filling. To understand these results, we construct an analytical
+theory based on the Floquet theorem. The theory successfully explains the
+dependencies on $E_0$ and $\omega$ and ascribes the electron-filling dependence
+to a momentum-dependent effective magnetic field governed by the Fermi-surface
+geometry. Several candidate materials and experimental conditions relevant to
+our theory and model parameters are also discussed. Our findings will enable us
+to engineer the magneto-optical responses of matters via tuning the material
+parameters.",2007.08072v1
+2020-07-16,Large spin to charge conversion in topological superconductor \b{eta}-PdBi2 at room temperature,"\b{eta}-PdBi2 has attracted much attention for its prospective ability to
+possess simultaneously topological surface and superconducting states due to
+its unprecedented spin-orbit interaction (SOC). Whereas most works have focused
+solely on investigating its topological surface states, the coupling between
+spin and charge degrees of freedom in this class of quantum material remains
+unexplored. Here we first report a study of spin-to-charge conversion in a
+\b{eta}-PdBi2 ultrathin film grown by molecular beam epitaxy, utilizing a spin
+pumping technique to perform inverse spin Hall effect measurements. We find
+that the room temperature spin Hall angle of Fe/\b{eta}-PdBi2,
+{\theta}_SH=0.037. This value is one order of magnitude larger than that of
+reported conventional superconductors, and is comparable to that of the best
+SOC metals and topological insulators. Our results provide an avenue for
+developing superconductor-based spintronic applications.",2007.08693v1
+2016-05-19,Longitudinal spin-relaxation of donor-bound electrons in direct bandgap semiconductors,"We measure the donor-bound electron longitudinal spin-relaxation time ($T_1$)
+as a function of magnetic field ($B$) in three high-purity direct-bandgap
+semiconductors: GaAs, InP, and CdTe, observing a maximum $T_1$ of
+$1.4~\text{ms}$, $0.4~\text{ms}$ and $1.2~\text{ms}$, respectively. In GaAs and
+InP at low magnetic field, up to $\sim2~\text{T}$, the spin-relaxation
+mechanism is strongly density and temperature dependent and is attributed to
+the random precession of the electron spin in hyperfine fields caused by the
+lattice nuclear spins. In all three semiconductors at high magnetic field, we
+observe a power-law dependence ${T_1 \propto B^{-\nu}}$ with ${3\lesssim \nu
+\lesssim 4}$. Our theory predicts that the direct spin-phonon interaction is
+important in all three materials in this regime in contrast to quantum dot
+structures. In addition, the ""admixture"" mechanism caused by Dresselhaus
+spin-orbit coupling combined with single-phonon processes has a comparable
+contribution in GaAs. We find excellent agreement between high-field theory and
+experiment for GaAs and CdTe with no free parameters, however a significant
+discrepancy exists for InP.",1605.05978v1
+2018-03-01,Classical and quantum spin dynamics of the honeycomb $Γ$ model,"Quantum to classical crossover is a fundamental question in dynamics of
+quantum many-body systems. In frustrated magnets, for example, it is highly
+non-trivial to describe the crossover from the classical spin liquid with a
+macroscopically-degenerate ground-state manifold, to the quantum spin liquid
+phase with fractionalized excitations. This is an important issue as we often
+encounter the demand for a sharp distinction between the classical and quantum
+spin liquid behaviors in real materials. Here we take the example of the
+classical spin liquid in a frustrated magnet with novel bond-dependent
+interactions to investigate the classical dynamics, and critically compare it
+with quantum dynamics in the same system. In particular, we focus on signatures
+in the dynamical spin structure factor. Combining Landau-Lifshitz dynamics
+simulations and the analytical Martin-Siggia-Rose (MSR) approach, we show that
+the low energy spectra are described by relaxational dynamics and highly
+constrained by the zero mode structure of the underlying degenerate classical
+manifold. Further, the higher energy spectra can be explained by precessional
+dynamics. Surprisingly, many of these features can also be seen in the
+dynamical structure factor in the quantum model studied by finite-temperature
+exact diagonalization. We discuss the implications of these results, and their
+connection to recent experiments on frustrated magnets with strong spin-orbit
+coupling.",1803.00601v2
+2018-06-20,Current-induced modulation of interfacial Dzyaloshinskii-Moriya interaction,"The Dzyaloshinskii-Moriya (DM) interaction is an antisymmetric exchange
+interaction that is responsible for the emergence of chiral magnetism. The
+origin of the DM interaction, however, remains to be identified albeit the
+large number of studies reported on related effects. It has been recently
+suggested that the DM interaction is equivalent to an equilibrium spin current
+density originating from spin-orbit coupling, an effect referred to as the spin
+Doppler effect. The model predicts that the DM interaction can be controlled by
+spin current injected externally. Here we show that the DM exchange constant
+($D$) in W/CoFeB based heterostructures can be modulated with external current
+passed along the film plane. At higher current, $D$ decreases with increasing
+current, which we infer is partly due to the adiabatic spin transfer torque. At
+lower current, $D$ increases linearly with current regardless of the polarity
+of current flow. The rate of increase in $D$ with the current density agrees
+with that predicted by the model based on the spin Doppler effect. These
+results imply that the DM interaction at the HM/FM interface partly originates
+from an equilibrium interface spin (polarized) current which can be modulated
+externally.",1806.07746v2
+2018-07-17,"Field-induced intermediate phase in $α$-RuCl$_3$: Non-coplanar order, phase diagram, and proximate spin liquid","Frustrated magnets with strong spin-orbit coupling promise to host
+topological states of matter, with fractionalized excitations and emergent
+gauge fields. Kitaev's proposal for a honeycomb-lattice Majorana spin liquid
+has triggered an intense search for experimental realizations, with
+bond-dependent Ising interaction being the essential building block. A prime
+candidate is $\alpha$-RuCl$_3$ whose phase diagram in a magnetic field is,
+however, not understood to date. Here we present conclusive experimental
+evidence for a novel field-induced ordered phase in $\alpha$-RuCl$_3$,
+sandwiched between the zigzag and quantum disordered phases at low and high
+fields, respectively. We provide a detailed theoretical study of the relevant
+effective spin model which we show to display a field-induced intermediate
+phase as well. We fully characterize the intermediate phase within this model,
+including its complex spin structure, and pinpoint the parameters relevant to
+$\alpha$-RuCl$_3$ based on the experimentally observed critical fields. Most
+importantly, our study connects the physics of $\alpha$-RuCl$_3$ to that of the
+Kitaev-$\Gamma$ model, which displays a quantum spin liquid phase in zero
+field, and hence reveals the spin liquid whose signatures have been detected in
+a variety of dynamical probes of $\alpha$-RuCl$_3$.",1807.06192v2
+2020-03-06,Emergence of an upper bound to the electric field controlled Rashba spin splitting in InAs nanowires,"The experimental assessment of the strength ($\alpha_R$) of the Rashba
+spin-orbit coupling is rather indirect and involves the measurement of the spin
+relaxation length from magnetotransport, together with a model of weak
+antilocalization. The analysis of the spin relaxation length in nanowires,
+however, clouds the experimental assessment of the $\alpha_R$ and leads to the
+prevailing belief that it can be tuned freely with electric field--a central
+tenant of spintronics. Here, we report direct theory of $\alpha_R$ leading to
+atomistic calculations of the spin band structure of InAs nanowires upon
+application of electric field-- a direct method that does not require a theory
+of spin relaxation. Surprisingly, we find an {\it upper bound} to the electric
+field tunable Rashba spin splitting and the ensuing $\alpha_R$; for InAs
+nanowires, $\alpha_R$ is pinned at about 170 meV{\AA} irrespective of the
+applied field strength. We find that this pinning is due to the quantum
+confined stark effect, that reduces continuously the nanowire band gap with
+applied electric field, leading eventually to band gap closure and a
+considerable increase in the density of free carriers. This results in turn in
+a strong screening that prevents the applied electric field inside the nanowire
+from increasing further beyond around 200 kV/cm for InAs nanowires. Therefore,
+further increase in the gate voltage will not increase $\alpha_R$. This finding
+clarifies the physical trends to be expected in nanowire Rashba SOC and the
+roles played by the nano size and electric field.",2003.02984v1
+2021-03-03,Optical spin conductivity in ultracold quantum gases,"We show that the optical spin conductivity being a small AC response of a
+bulk spin current and elusive in condensed matter systems can be measured in
+ultracold atoms. We demonstrate that this conductivity contains rich
+information on quantum states by analyzing experimentally achievable systems
+such as a spin-1/2 superfluid Fermi gas, a spin-1 Bose-Einstein condensate, and
+a Tomonaga-Luttinger liquid. The obtained conductivity spectra being absent in
+the Drude conductivity reflect quasiparticle excitations and non-Fermi liquid
+properties. Accessible physical quantities include the superfluid gap and the
+contact for the superfluid Fermi gas, gapped and gapless spin excitations as
+well as quantum depletion for the Bose-Einstein condensate, and the spin part
+of the Tomonaga-Luttinger liquid parameter elusive in cold-atom experiments.
+Unlike its mass transport counterpart, the spin conductivity serves as a probe
+applicable to clean atomic gases without disorder and lattice potentials. Our
+formalism can be generalized to various systems such as spin-orbit coupled and
+nonequilibrium systems.",2103.02418v4
+2021-03-12,Atomic-layer Rashba-type superconductor protected by dynamic spin-momentum locking,"Spin-momentum locking is essential to the spin-split Fermi surfaces of
+inversion-symmetry broken materials, which are caused by either Rashba-type or
+Zeeman-type spin-orbit coupling (SOC). While the effect of Zeeman-type SOC on
+superconductivity has experimentally been shown recently, that of Rashba-type
+SOC remains elusive. Here we report on convincing evidence for the critical
+role of the spin-momentum locking on crystalline atomic-layer superconductors
+on surfaces, for which the presence of the Rashba-type SOC is demonstrated.
+In-situ electron transport measurements reveal that in-plane upper critical
+magnetic field is anomalously enhanced, reaching approximately three times the
+Pauli limit at $T = 0$. Our quantitative analysis clarifies that dynamic
+spin-momentum locking, a mechanism where spin is forced to flip at every
+elastic electron scattering, suppresses the Cooper pair-breaking parameter by
+orders of magnitude and thereby protects superconductivity. The present result
+provides a new insight into how superconductivity can survive the detrimental
+effects of strong magnetic fields and exchange interactions.",2103.07143v1
+2021-05-06,Spin-valley locked instabilities in moire transition metal dichalcogenides with conventional and higher-order Van Hove singularities,"Recent experiments have observed correlated insulating and possible
+superconducting phases in twisted homobilayer transition metal dichalcogenides
+(TMDs). Besides the spin-valley locked moire bands due to the intrinsic Ising
+spin-orbit coupling, homobilayer moire TMDs also possess either logarithmic or
+power-law divergent Van Hove singularities (VHS) near the Fermi surface,
+controllable by an external displacement field. The former and the latter are
+dubbed conventional and higher-order VHS, respectively. Here, we perform a
+perturbative renormalization group (RG) analysis to unbiasedly study the
+dominant instabilities in homobilayer TMDs for both the conventional and
+higher-order VHS cases. We find that the spin-valley locking largely alters the
+RG flows and leads to instabilities unexpected in the corresponding
+extensively-studied graphene-based moire systems, such as spin- and
+valley-polarized ferromagnetism and topological superconductivity with mixed
+parity. In particular, for the case with two higher-order VHS, we find a
+spin-valley-locking-driven metallic state with no symmetry breaking in the TMDs
+despite the diverging bare susceptibility. Our results show how the spin-valley
+locking significantly affects the RG analysis and demonstrate that moire TMDs
+are suitable platforms to realize various interaction-induced spin-valley
+locked phases, highlighting physics fundamentally different from the
+well-studied graphene-based moire systems.",2105.02415v2
+2021-06-20,"Reversible giant out-of-plane Rashba effect in two-dimensional Ga$XY$ ($X$= Se, Te; $Y$= Cl, Br, I) compounds for persistent spin helix","The coexistence of ferroelectricity and spin-orbit coupling (SOC) in
+noncentrosymmetric systems may allow for a nonvolatile control of spin degrees
+of freedom by switching the ferroelectric polarization through the well-known
+ferroelectric Rashba effect (FRE). Although the FER has been widely observed
+for bulk ferroelectric systems, its existence in two-dimensional (2D)
+ferroelectric systems is still very rarely discovered. Based on
+first-principles calculations, supplemented with $\vec{k}\cdot\vec{p}$
+analysis, we report the emergence of the FRE in the Ga$XY$ ($X$= Se, Te; $Y$=
+Cl, Br, I) monolayer compounds, a new class of 2D materials having in-plane
+ferroelectricity. Due to the large in-plane ferroelectric polarization, a giant
+out-of-plane Rashba effect is observed in the topmost valence band, producing
+unidirectional out-of-plane spin textures in the momentum space. Importantly,
+such out-of-plane spin textures, which can host a long-lived helical spin mode
+known as a persistent spin helix, can be fully reversed by switching the
+direction of the in-plane ferroelectric polarization. Thus, our findings can
+open avenues for interplay between the unidirectional out-of-plane Rashba
+effect and the in-plane ferroelectricity in 2D materials, which is useful for
+efficient and non-volatile spintronic devices.",2106.10596v1
+2021-06-29,Berry curvature-induced local spin polarisation in gated graphene/WTe$_2$ heterostructures,"Full experimental control of local spin-charge interconversion is of primary
+interest for spintronics. Heterostructures combining graphene with a strongly
+spin-orbit coupled two-dimensional (2D) material enable such functionality by
+design. Electric spin valve experiments have provided so far global information
+on such devices, while leaving the local interplay between symmetry breaking,
+charge flow across the heterointerface and aspects of topology unexplored.
+Here, we utilize magneto-optical Kerr microscopy to resolve the gate-tunable,
+local current-induced spin polarisation in graphene/WTe$_2$ van der Waals (vdW)
+heterostructures. It turns out that even for a nominal in-plane transport,
+substantial out-of-plane spin accumulation is induced by a corresponding
+out-of-plane current flow. We develop a theoretical model which explains the
+gate- and bias-dependent onset and spatial distribution of the massive Kerr
+signal on the basis of interlayer tunnelling, along with the reduced point
+group symmetry and inherent Berry curvature of the heterostructure. Our
+findings unravel the potential of 2D heterostructure engineering for harnessing
+topological phenomena for spintronics, and constitute an important further step
+toward electrical spin control on the nanoscale.",2106.15509v1
+2021-10-21,Angular harmonic Hall voltage and magnetoresistance measurements of Pt/FeCoB and Pt-Ti/FeCoB bilayers for spin Hall conductivity determination,"Materials with significant spin-orbit coupling enable efficient
+spin-to-charge interconversion, which can be utilized in novel spin electronic
+devices. A number of elements, mainly heavy-metals (HM) have been identified to
+produce a sizable spin current ($j_\mathrm{s}$), while supplied with a charge
+current ($j$), detected mainly in the neighbouring ferromagnetic (FM) layer.
+Apart from the spin Hall angle $\theta_\mathrm{SH}$ = $j_\mathrm{s}$/$j$, spin
+Hall conductivity ($\sigma_\mathrm{SH}$) is an important parameter, which takes
+also the resistivity of the material into account. In this work, we present a
+measurement protocol of the HM/FM bilayers, which enables for a precise
+$\sigma_\mathrm{SH}$ determination. Static transport measurements, including
+resistivity and magnetization measurements are accompanied by the angular
+harmonic Hall voltage analysis in a dedicated low-noise rotating probe station.
+Dynamic characterization includes effective magnetization and magnetization
+damping measurement, which enable HM/FM interface absorption calculation. We
+validate the measurement protocol in Pt and Pt-Ti underlayers in contact with
+FeCoB and present the $\sigma_\mathrm{SH}$ of up to 3.3$\times$10$^5$ S/m,
+which exceeds the values typically measured in other HM, such as W or Ta.",2110.11483v1
+2021-12-22,Vanishing of the quantum spin Hall phase in a semi-Dirac Kane Mele model,"We study the vanishing of the topological properties of a quantum spin Hall
+insulator induced by a deformation of the band structure that interpolates
+between the Dirac and the semi-Dirac limits of a tight-binding model on a
+honeycomb lattice. The above scenario is mimicked in a simple model, where
+there exists a differential hopping along one of the three neighbours (say,
+$t_1$) compared to the other two (say, $t$). For $t_1 = t$, the properties of
+the quantum spin Hall phase is described by the familiar Kane Mele model, while
+$t<t_1<2t$ denotes a situation in which the spin resolved bands are
+continuously deformed. $t_1 = 2t$ represents a special case which is called as
+the semi-Dirac limit. Here, the spectral gaps between the conduction and the
+valence bands vanish. A closer inspection of the properties of such a deformed
+system yields insights on a topological phase transition occurring at the
+semi-Dirac limit, which continues to behave as a band insulator for $t_1>2t$.
+We demonstrate the evolution of the topological phase in presence of the Rashba
+and intrinsic spin-orbit couplings via computing the electronic band structure,
+edge modes in a nanoribbon and the $\mathbb{Z}_2$ invariant. The latter aids in
+arriving at the phase diagram which conclusively shows vanishing of the
+topological phase in the semi-Dirac limit. Further we demonstrate in gradual
+narrowing down of the plateau in the spin Hall conductivity, which along with a
+phase diagram provide robust support on the vanishing of the $\mathbb{Z}_2$
+invariant and hence the quantum spin Hall phase.",2112.11737v1
+2022-06-14,Probing of large interfacial contribution to spin orbit coupling in CoFeB/Ta heterostructure by ultrafast THz emission spectroscopy,"Ultrafast THz radiation generation from ferromagnetic/nonmagnetic bilayer
+heterostructure-based spintronic emitters generally exploits the conversion
+from spin- to charge-current within the nonmagnetic layer and its interface
+with the ferromagnetic layer. Various possible sub-contributions to the
+underlying mechanism of inverse spin Hall effect for the THz emission from such
+structures, need to be exploited for not only investigating the intricacies at
+the fundamental level in the material properties themselves but also for
+improving their performance for broadband and high-power THz emission. Here, we
+report ultrafast THz emission from CoFeB/Ta bilayer at varying sample
+temperatures in a large range to unravel the role of intrinsic and extrinsic
+spin to charge conversion processes. In addition to an enhancement in the THz
+emission, its temperature dependence shows a THz signal polarity reversal if
+the CoFeB/Ta sample is annealed at an elevated temperature. We extract the
+behaviour of the spin Hall resistivity, determine the intrinsic spin Hall
+conductivity contribution in it and compare those with the standard Fe/Pt
+system. Our results clearly demonstrate a giant interfacial contribution to the
+overall spin Hall angle arising from the modified interface in the annealed
+CoFeB/Ta, where a sign reversal in the corresponding spin Hall angle is
+manifested from the THz amplitude variation with the temperature.",2206.06718v2
+2022-06-20,First-principles calculation of the parameters used by atomistic magnetic simulations,"While the ground state of magnetic materials is in general well described on
+the basis of spin density functional theory (SDFT), the theoretical description
+of finite-temperature and non-equilibrium properties require an extension
+beyond the standard SDFT. Time-dependent SDFT (TD-SDFT), which give for example
+access to dynamical properties are computationally very demanding and can
+currently be hardly applied to complex solids. Here we focus on the alternative
+approach based on the combination of a parameterized phenomenological spin
+Hamiltonian and SDFT-based electronic structure calculations, giving access to
+the dynamical and finite-temperature properties for example via spin-dynamics
+simulations using the Landau-Lifshitz-Gilbert (LLG) equation or Monte Carlo
+simulations. We present an overview on the various methods to calculate the
+parameters of the various phenomenological Hamiltonians with an emphasis on the
+KKR Green function method as one of the most flexible band structure methods
+giving access to practically all relevant parameters. Concerning these, it is
+crucial to account for the spin-orbit coupling (SOC) by performing relativistic
+SDFT-based calculations as it plays a key role for magnetic anisotropy and
+chiral exchange interactions represented by the DMI parameters in the spin
+Hamiltonian. This concerns also the Gilbert damping parameters characterizing
+magnetization dissipation in the LLG equation, chiral multispin interaction
+parameters of the extended Heisenberg Hamiltonian, as well as spin-lattice
+interaction parameters describing the interplay of spin and lattice dynamics
+processes, for which an efficient computational scheme has been developed
+recently by the present authors.",2206.09969v1
+2022-11-07,Optically controlled single-valley exciton doublet states with tunable internal spin structures and spin magnetization generation,"Manipulating quantum states through light-matter interactions has been
+actively pursued in two-dimensional (2D) materials research. Significant
+progress has been made towards the optical control of the valley degrees of
+freedom in semiconducting monolayer transition-metal dichalcogenides (TMD),
+based on doubly degenerate excitons from their two distinct valleys in
+reciprocal space. Here, we introduce a novel kind of optically controllable
+doubly degenerate exciton states that come from a single valley, dubbed as
+single-valley exciton doublet (SVXD) states. They are unique in that their
+constituent holes originate from the same valence band, making possible the
+direct optical control of the spin structure of the excited constituent
+electrons. Combining ab initio GW plus Bethe-Salpeter equation (GW-BSE)
+calculations and a newly developed theoretical analysis method, we demonstrate
+such novel SVXD in substrate-supported monolayer bismuthene -- which has been
+successfully grown using molecular beam epitaxy. In each of the two distinct
+valleys in the Brillouin zone, strong spin-orbit coupling and $C_{3v}$ symmetry
+lead to a pair of degenerate 1s exciton states (the SVXD states) with opposite
+spin configurations. Any coherent linear combinations of the SVXD in a single
+valley can be excited by light with a specific polarization, enabling full
+manipulation of their internal spin configurations. In particular, a
+controllable net spin magnetization can be generated through light excitation.
+Our findings open new routes to control quantum degrees of freedom, paving the
+way for applications in spintronics and quantum information science.",2211.03334v2
+2022-11-10,Triplet Cooper pair splitting in a two-dimensional electron gas,"Cooper pairs occupy the ground state of typical s-wave superconductors and
+are composed of maximally entangled electrons with opposite spin. In order to
+study the spin and entanglement properties of these electrons, one must
+separate them spatially via a process known as Cooper pair splitting (CPS).
+Here we provide the first demonstration of CPS in a semiconductor
+two-dimensional electron gas (2DEG). By coupling two quantum dots to a
+superconductor-semiconductor hybrid region we achieve efficient Cooper pair
+splitting, and clearly distinguish it from other local and non-local processes.
+In the presence of a magnetic field, the dots are operated as spin-filters to
+obtain information about the spin of the electrons forming the Cooper pair. Not
+only do we demonstrate the splitting of Cooper pairs into opposite-spin
+electrons (i.e. singlet pairing), but also into equal-spin electrons, thus
+achieving a triplet pairing between the quantum dots. Notably, the
+exceptionally strong spin-orbit interaction in our 2DEGs, results in comparable
+amplitudes of singlet and triplet pairing. The demonstration of singlet and
+triplet CPS in 2DEGs opens the possibility to study on-chip entanglement and
+topological superconductivity in the form of artificial Kitaev chains.",2211.05763v1
+2023-03-01,"Universal mechanism of Ising superconductivity in twisted bilayer, trilayer and quadrilayer graphene","We show that the superconducivity in twisted graphene multilayers originates
+from a common feature, which is the strong valley symmetry breaking
+characteristic of these moir\'e systems at the magic angle. This leads to a
+breakdown of the rotational symmetry of the flat moir\'e bands down to $C_3$,
+and to ground states in which the time-reversal symmetry is broken for a given
+spin projection. However, this symmetry can be recovered upon exchange of
+spin-up and spin-down electrons, as we illustrate by means of a self-consistent
+microscopic Hartree-Fock resolution where the states for the two spin
+projections acquire opposite sign of the valley polarization. There is then a
+spin-valley locking by which the Fermi lines for the two spin projections are
+different and related by inversion symmetry. This effect represents a large
+renormalization of the bare spin-orbit coupling of the graphene multilayers,
+lending protection to the superconductivity against in-plane magnetic fields.
+In the twisted bilayer as well as in trilayer and quadrilayer graphene, the
+pairing glue is shown to be given by the nesting between parallel segments of
+the Fermi lines which arise from the breakdown of symmetry down to $C_3$. This
+leads to a strong Kohn-Luttinger pairing instability, which is relevant until
+the Fermi line recovers gradually a more isotropic shape towards the bottom of
+the second valence band, explaining why the superconductivity fades away beyond
+three-hole doping of the moir\'e unit cell.",2303.00583v1
+2023-05-22,Ultralong 100 ns Spin Relaxation Time in Graphite at Room Temperature,"Graphite has been intensively studied, yet its electron spins dynamics
+remains an unresolved problem even 70 years after the first experiments. The
+central quantities, the longitudinal ($T_1$) and transverse ($T_2$) relaxation
+times were postulated to be equal, mirroring standard metals, but $T_1$ has
+never been measured for graphite. Here, based on a detailed band structure
+calculation including spin-orbit coupling, we predict an unexpected behavior of
+the relaxation times. We find, based on saturation ESR measurements, that $T_1$
+is markedly different from $T_2$. Spins injected with perpendicular
+polarization with respect to the graphene plane have an extraordinarily long
+lifetime of $100$ ns at room temperature. This is ten times more than in the
+best graphene samples. The spin diffusion length across graphite planes is thus
+expected to be ultralong, on the scale of $\sim 70~\mu$m, suggesting that thin
+films of graphite -- or multilayer AB graphene stacks -- can be excellent
+platforms for spintronics applications compatible with 2D van der Waals
+technologies. Finally, we provide a qualitative account of the observed spin
+relaxation based on the anisotropic spin admixture of the Bloch states in
+graphite obtained from density functional theory calculations.",2305.15433v1
+2023-07-06,Spin-Polarized Majorana Zero Modes in Proximitized Superconducting Penta-Silicene Nanoribbons,"We theoretically investigate the possibility of obtaining Majorana zero modes
+(MZMs) in penta-silicene nanoribbons (p-SiNRs) with induced \textit{p}-wave
+superconductivity. The model explicitly considers an external magnetic field
+perpendicularly applied to the nanoribbon plane, as well as an extrinsic Rashba
+spin-orbit coupling (RSOC), in addition to the first nearest neighbor hopping
+term and \textit{p}-wave superconducting pairing. By analyzing the dispersion
+relation profiles, we observe the successive closing and reopening of the
+induced superconducting gap with a single spin component, indicating a
+spin-polarized topological phase transition (TPT). Correspondingly, the plots
+of the energy spectrum versus the chemical potential reveal the existence of
+zero-energy states with a preferential spin orientation characterized by
+nonoverlapping wave functions localized at opposite ends of the superconducting
+p-SiNRs. These findings strongly suggest the emergence of topologically
+protected, spin-polarized MZMs at the ends of the p-SiNRs with induced
+\textit{p}-wave superconducting pairing, which can be realized by proximitizing
+the nanoribbon with an \textit{s}-wave superconductor, such as lead. The
+proposal paves the way for silicene-based Majorana devices hosting multiple
+MZMs with a well-defined spin orientation, with possible applications in
+fault-tolerant quantum computing platforms and Majorana spintronics.",2307.03185v1
+2023-07-19,Spin Space Groups: Full Classification and Applications,"In this work, we exhaust all the spin-space symmetries, which fully
+characterize collinear, non-collinear, commensurate, and incommensurate spiral
+magnetism, and investigate enriched features of electronic bands that respect
+these symmetries. We achieve this by systematically classifying the so-called
+spin space groups (SSGs) - joint symmetry groups of spatial and spin operations
+that leave the magnetic structure unchanged. Generally speaking, they are
+accurate (approximate) symmetries in systems where spin-orbit coupling (SOC) is
+negligible (finite but weaker than the interested energy scale); but we also
+show that specific SSGs could remain valid even in the presence of a strong
+SOC. By representing the SSGs as O($N$) representations, we - for the first
+time - obtain the complete classifications of 1421, 9542, and 56512 distinct
+SSGs for collinear ($N=1$), coplanar ($N=2$), and non-coplanar ($N=3$)
+magnetism, respectively. SSG not only fully characterizes the symmetry of spin
+d.o.f., but also gives rise to exotic electronic states, which, in general,
+form projective representations of magnetic space groups (MSGs). Surprisingly,
+electronic bands in SSGs exhibit features never seen in MSGs, such as
+nonsymmorphic SSG Brillouin zone (BZ), where SSG operations behave as glide or
+screw when act on momentum and unconventional spin-momentum locking, which is
+completely determined by SSG, independent of Hamiltonian details. To apply our
+theory, we identify the SSG for each of the 1604 published magnetic structures
+in the MAGNDATA database on the Bilbao Crystallographic Server. Material
+examples exhibiting aforementioned novel features are discussed with emphasis.
+We also investigate new types of SSG-protected topological electronic states
+that are unprecedented in MSGs.",2307.10364v2
+2023-12-12,Dzyaloshinskii-Moriya interaction inducing weak ferromagnetism in centrosymmetric altermagnets and weak ferrimagnetism in noncentrosymmetric altermagnets,"The Dzyaloshinskii-Moriya interaction (DMI) has explained successfully the
+weak ferromagnetism in some centrosymmetric antiferromagnets. However, in the
+last years, it was generally claimed that the DMI is not effective in
+centrosymmetric systems. We reconciled these views by separating the
+conventional antiferromagnets and altermagnets. Altermagnets represent
+collinear antiferromagnetic compounds with spin-up and spin-down sublattices
+connected only by mirror and roto-translational symmetries. Consequently, the
+system shows even-parity wave spin order in the k-space lifting the Kramer's
+degeneracy in the non-relativistic band structure. We emphasize that the DMI
+can create weak ferromagnetism in centrosymmetric altermagnets while it is not
+effective in centrosymmetric conventional antiferromagnets. Additionally, DMI
+can create weak ferromagnetism or weak ferrimagnetism in noncentrosymmetric
+altermagnets. Once the spin-orbit coupling is included in an altermagnetic
+system without time-reversal symmetry, the components of spin moments of the
+two sublattices along the Neel vector are antiparallel but the other two spin
+components orthogonal to the N\'eel vector can be either parallel or
+antiparallel for centrosymetric systems. For noncentrosymmetric systems, we can
+have different bands showing parallel or antiparallel spin components resulting
+in weak ferrimagnetism. We can divide the altermagnetic compounds into classes
+based on the weak ferromagnetism or weak ferrimagnetism properties. The weak
+ferromagnetism and weak ferrimagnetism induced by DMI is a property exclusively
+of the altermagnets, not present in either ferromagnets or conventional
+antiferromagnets so we propose that altermagnets should be classified based on
+this property.",2312.07678v2
+2023-12-13,Antiparallel spin polarization and spin current induced by thermal current and locally-broken inversion symmetry in a double-quantum-well structure,"Generating a nonequilibrium spin polarization with a driving force has been
+first realized by the electric current in a system with broken inversion
+symmetry and extended to that induced by the thermal current and that appearing
+in an inversion-symmetric system with locally-broken inversion symmetry. This
+paper theoretically explores the spin polarization generated by the thermal
+current and the locally-broken inversion symmetry in a symmetric
+double-quantum-well structure (DQWS). This thermally-induced spin polarization
+(TISP) appears in the antiparallel configuration with the TISP of two wells in
+opposite directions. The calculation using the Boltzmann equation in the
+relaxation-time approximation under the condition of zero charge current shows
+that the local TISP exhibits the maximum at a finite Rashba spin-orbit
+interaction when the electron density is fixed. This is because the local TISP
+in the DQWS is enhanced at the chemical potential near the bottom of the
+first-excited subband. This enhancement also occurs in a single quantum well
+with globally-broken inversion symmetry. Another finding is that the maximum of
+the local TISP appears at a nonzero interwell coupling. The spin current by the
+diffusion of the local TISP into an adjacent electrode is also calculated.",2312.07944v1
+2024-03-27,Rashba spin splitting-induced topological Hall effect in a Dirac semimetal-ferromagnetic semiconductor heterostructure,"We use a concerted theory-experiment effort to investigate the formation of
+chiral real space spin texture when the archetypal Dirac semimetal Cd$_3$As$_2$
+is interfaced with In$_{1-x}$Mn$_x$As, a ferromagnetic semiconductor with
+perpendicular magnetic anisotropy. Our calculations reveal a nonzero
+off-diagonal spin susceptibility in the Cd$_3$As$_2$ layer due to the Rashba
+spin-orbit coupling from broken inversion symmetry. This implies the presence
+of a Dzyaloshinskii-Moriya interaction between local moments in the
+In$_{1-x}$Mn$_x$As layer, mediated by Dirac electrons in the vicinal
+Cd$_3$As$_2$ layer, potentially creating the conditions for a real space chiral
+spin texture. Using electrical magnetoresistance measurements at low
+temperature, we observe an emergent excess contribution to the transverse
+magneto-resistance whose behavior is consistent with a topological Hall effect
+arising from the formation of an interfacial chiral spin texture. This excess
+Hall voltage varies with gate voltage, indicating a promising
+electrostatically-tunable platform for understanding the interplay between the
+helical momentum space states of a Dirac semimetal and chiral real space spin
+textures in a ferromagnet.",2403.18485v1
+2015-06-26,Modeling and Simulation of Spin Transfer Torque Generated at Topological Insulator/Ferromagnetic Heterostructure,"Topological Insulator (TI) has recently emerged as an attractive candidate
+for possible application to spintronic circuits because of its strong spin
+orbit coupling. TIs are unique materials that have an insulating bulk but
+conducting surface states due to band inversion and these surface states are
+protected by time reversal symmetry. In this paper, we propose a physics-based
+spin dynamics simulation framework for TI/Ferromagnet (TI/FM) bilayer
+heterostructures that is able to capture the electronic band structure of a TI
+while calculating the electron and spin transport properties. Our model differs
+from TI/FM models proposed in the literature in that it is able to account for
+the 3D band structure of TIs and the effect of exchange coupling and external
+magnetic field on the band structure. Our proposed approach uses 2D surface
+Hamiltonian for TIs that includes all necessary features for spin transport
+calculations so as to properly model the characteristics of a TI/FM
+heterostructure. Using this Hamiltonian and appropriate parameters, we show
+that the effect of quantum confinement and exchange coupling are successfully
+captured in the calculated surface band structure compared with the quantum
+well band diagram of a 3D TI, and matches well with experimental data reported
+in the literature. We then show how this calibrated Hamiltonian is used with
+the self-consistent non equilibrium Green's functions (NEGF) formalism to
+determine the charge and spin transport in TI/FM bilayer heterostructures. Our
+calculations agree well with experimental data and capture the unique features
+of a TI/FM heterostructure such as high spin Hall angle, high spin conductivity
+etc. Finally, we show how the results obtained from NEGF calculations may be
+incorporated into the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) formulation to
+simulate the magnetization dynamics of an FM layer sitting on top of a TI.",1506.07932v2
+2006-02-22,Spin-Hall effect in semiconductor heterostructures with cubic Rashba spin-orbit interaction,"We study the spin-Hall effect in systems with weak cubic Rashba spin-orbit
+interaction. To this end we derive particle and spin diffusion equations and
+explicit expressions for the spin-current tensor in the diffusive regime. We
+discuss the impact of electric fields on the Green's functions and the
+diffusion equations and establish a relationship between the spin-current
+tensor and the spin diffusion equations for the model under scrutiny. We use
+our results to calculate the edge spin-accumulation in a spin-Hall experiment
+and show that there is also a new Hall-like contribution to the electric
+current in such systems.",0602517v1
+2018-05-04,"Metal-insulator transitions, superconductivity, and magnetism in the two-band Hubbard model","We explore the ground-state properties of the two-band Hubbard model with
+degenerate electronic bands, parametrized by nearest-neighbor hopping $t$,
+intra- and inter-orbital on-site Coulomb repulsions $U$ and $U^\prime$, and
+Hund coupling $J$, focusing on the case with $J>0$. Using Jastrow-Slater wave
+functions, we consider both states with and without magnetic/orbital order.
+Electron pairing can also be included in the wave function, in order to detect
+the occurrence of superconductivity for generic electron densities $n$. When no
+magnetic/orbital order is considered, the Mott transition is continuous for
+$n=1$ (quarter filling); instead, at $n=2$ (half filling), it is first order
+for small values of $J/U$, while it turns out to be continuous when the ratio
+$J/U$ is increased. A significant triplet pairing is present in a broad region
+around $n=2$. By contrast, singlet superconductivity (with $d$-wave symmetry)
+is detected only for small values of the Hund coupling and very close to half
+filling. When including magnetic and orbital order, the Mott insulator acquires
+antiferromagnetic order for $n=2$; instead, for $n=1$ the insulator has
+ferromagnetic and antiferro-orbital orders. In the latter case, a metallic
+phase is present for small values of $U/t$ and the metal-insulator transition
+becomes first order. In the region with $1<n<2$, we observe that ferromagnetism
+(with no orbital order) is particularly robust for large values of the Coulomb
+repulsion and that triplet superconductivity is strongly suppressed by the
+presence of antiferromagnetism. The case with $J=0$, which has an enlarged
+SU(4) symmetry due to the interplay between spin and orbital degrees of
+freedom, is also analyzed.",1805.01856v2
+2014-07-08,Exotic Spin Order due to Orbital Fluctuations,"We investigate the phase diagrams of the spin-orbital $d^9$ Kugel-Khomskii
+model for increasing system dimensionality: from the square lattice monolayer,
+via the bilayer to the cubic lattice. In each case we find strong competition
+between different types of spin and orbital order, with entangled spin-orbital
+phases at the crossover from antiferromagnetic to ferromagnetic correlations in
+the intermediate regime of Hund's exchange. These phases have various types of
+exotic spin order and are stabilized by effective interactions of longer range
+which follow from enhanced spin-orbital fluctuations. We find that orbital
+order is in general more robust and spin order melts first under increasing
+temperature, as observed in several experiments for spin-orbital systems.",1407.2142v1
+2015-04-10,Proton and neutron correlations in $^{10}$B,"We investigate positive-parity states of $^{10}$B with the calculation of
+antisymmetrized molecular dynamics focusing on $pn$ pair correlations. We
+discuss effects of the spin-orbit interaction on energy spectra and $pn$
+correlations of the $J^\pi T=1^+_10$, $=3^+_10$, and $0^+_11$ states. The
+$1^+_10$ state has almost no energy gain of the spin-orbit interaction, whereas
+the $3^+_10$ state gains the spin-orbit interaction energy largely to come down
+to the ground state. We interpret a part of the two-body spin-orbit interaction
+in the adopted effective interactions as a contribution of the genuine $NNN$
+force, and find it to be essential for the level ordering of the $3^+_10$ and
+$1^+_10$ states in $^{10}$B. We also apply a $2\alpha+pn$ model to discuss
+effects of the spin-orbit interaction on $T=0$ and $T=1$ $pn$ pairs around the
+2$\alpha$ core. In the spin-aligned $J^\pi T=3^+0$ state, the spin-orbit
+interaction affects the $(ST)=(10)$ pair attractively and keeps the pair close
+to the core, whereas, in the $1^+0$ state, it gives a minor effect to the
+$(ST)=(10)$ pair. In the $0^+1$ state, the $(ST)=(01)$ pair is somewhat
+dissociated by the spin-orbit interaction.",1504.02594v1
+2008-07-10,Self-Spin-Controlled Rotation of Spatial States of a Dirac Electron in a Cylindrical Potential via Spin-Orbit Interaction,"Solution of the Dirac equation predicts that when an electron with non-zero
+orbital angular momentum propagates in a cylindrically symmetric potential, its
+spin and orbital degrees of freedom interact, causing the electron's phase
+velocity to depend on whether its spin and orbital angular momenta vectors are
+oriented parallel or anti-parallel with respect to each other. This spin-orbit
+splitting of the electronic dispersion curves can result in a rotation of the
+electron's spatial state in a manner controlled by the electron's own spin
+z-component value. These effects persist at non-relativistic velocities. To
+clarify the physical origin of this effect, we compare solutions of the Dirac
+equation to perturbative predictions of the Schrodinger-Pauli equation with a
+spin-orbit term, using the standard Foldy-Wouthuysen Hamiltonian. This clearly
+shows that the origin of the effect is the familiar relativistic spin-orbit
+interaction.",0807.1566v2
+2002-09-13,"Reply to a Comment by J. Bolte, R. Glaser and S. Keppeler on: Semiclassical theory of spin-orbit interactions using spin coherent states","We reply to a Comment on our recently proposed semiclassical theory for
+systems with spin-orbit interactions.",0209028v1
+2003-07-17,Optical Generation and Quantitative Characterizations of Electron-hole Entanglement,"Using a method of characterizing entanglement in the framework of quantum
+field theory, we investigate the optical generation and quantitative
+characterizations of quantum entanglement in an electron-hole system, in
+presence of spin-orbit coupling, and especially make a theoretical analysis of
+a recent experimental result. Basically, such entanglement should be considered
+as between occupation numbers of single particle basis states, and is
+essentially generated by coupling between different single particle basis
+states in the second quantized Hamiltonian. Interaction with two resonant light
+modes of different circular polarizations generically leads to a superposition
+of ground state and two heavy-hole excitonic states. When and only when the
+state is a superposition of only the two excitonic eigenstates, the
+entanglement reduces to that between two distinguishable particles, each with
+two degrees of freedom, namely, band index, as characterized by angular
+momentum, and orbit, as characterized by position or momentum. The band-index
+state, obtained by tracing over the orbital degree of freedom, is found to be a
+pure state, hence the band-index and orbital degrees of freedom are separated
+in this state. We propose some basic ideas on spatially separating the electron
+and the hole, so that the entanglement of band-indices, or angular momenta, is
+between spatially separated electron and hole.",0307437v2
+2011-02-15,Tidal Evolution of Close-in Extrasolar Planets: High Stellar Q from New Theoretical Models,"In recent years it has been shown that the tidal coupling between extrasolar
+planets and their stars could be an important mechanism leading to orbital
+evolution. Both the tides the planet raises on the star and vice versa are
+important and dissipation efficiencies ranging over four orders of magnitude
+are being used. In addition, the discovery of extrasolar planets extremely
+close to their stars has made it clear that the estimates of the tidal quality
+factor, Q, of the stars based on Jupiter and its satellite system and on main
+sequence binary star observations are too low, resulting in lifetimes for the
+closest planets orders of magnitude smaller than their age. We argue that those
+estimates of the tidal dissipation efficiency are not applicable for stars with
+spin periods much longer than the extrasolar planets' orbital period. We
+address the problem by applying our own values for the dissipation efficiency
+of tides, based on our numerical simulations of externally perturbed volumes of
+stellar-like convection. The range of dissipation we find for main-sequence
+stars corresponds to stellar $Q_*$ of $10^8$ to $3{\times}10^9$. The derived
+orbit lifetimes are comparable to, or much longer than the ages of the observed
+extrasolar planetary systems. The predicted orbital decay transit timing
+variations due to the tidal coupling are below the rate of ms/yr for currently
+known systems, but within reach of an extended Kepler mission provided such
+objects are found in its field.",1102.3187v1
+2023-03-06,Theory for charge density wave and orbital-flux state in antiferromagnetic kagome metal FeGe,"In this work, we theoretically study the charge order and orbital magnetic
+properties of a new type of antiferromagnetic kagome metal FeGe. Based on first
+principles density functional theory (DFT) calculations, we have studied the
+electronic structures, Fermi-surface quantum fluctuations, as well as phonon
+properties of the antiferromagnetic kagome metal FeGe. We find that charge
+density wave emerges in such a system due to a subtle cooperation between
+electron-electron ($e$-$e$) interactions and electron-phonon couplings, which
+gives rise to an unusual scenario of interaction-triggered phonon
+instabilities, and eventually yields a charge density wave (CDW) state. We
+further show that, in the CDW phase, the ground-state current density
+distribution exhibits an intriguing star-of-David pattern, leading to flux
+density modulation. The orbital fluxes (or current loops) in this system
+emerges as a result of the subtle interplay between magnetism, lattice
+geometries, charge order, and spin-orbit coupling (SOC), which can be described
+by a simple, yet universal, tight-binding theory including a Kane-Mele type SOC
+term and a magnetic exchange interaction. We further study the origin of the
+peculiar step-edge states in FeGe, which shed light on the topological
+properties and correlation effects in this new type of kagome antiferromagnetic
+material.",2303.02824v1
+2023-07-11,Charge Transfer and Zhang-Rice Singlet Bands in the Nickelate Superconductor $\mathrm{La_3Ni_2O_7}$ under Pressure,"Recently, a bulk nickelate superconductor $\mathrm{La_3Ni_2O_7}$ is
+discovered at pressures with a remarkable high transition temperature $T_c \sim
+80K$. Here, we study a Hubbard model with tight-binding parameters derived from
+\textit{ab initio} calculations of $\mathrm{La_3Ni_2O_7}$, by employing large
+scale determinant quantum Monte Carlo and cellular dynamical mean-field theory.
+Our result suggests that the superexchange couplings in this system are
+comparable to that of cuprates. The system is a charge transfer insulator as
+hole concentration becomes four per site at large Hubbard $U$. Upon hole
+doping, two low-energy spin-singlet bands emerge in the system exhibiting
+distinct correlation properties: while the one composed of the out-of-plane
+Ni-$d_{3z^2-r^2}$ and O-$p_z$ orbitals demonstrates strong antiferromagnetic
+correlations and narrow effective bandwidth, the in-plane singlet band
+consisting of the Ni-$d_{x^2-y^2}$ and O-$p_x / p_y$ orbitals is in general
+more itinerant. Over a broad range of hole doping, the doped holes occupy
+primarily the $d_{x^2-y^2}$ and $p_x / p_y$ orbitals, whereas the
+$d_{3z^2-r^2}$ and $p_z$ orbitals retain underdoped. We propose an effective $
+t-J$ model to capture the relevant physics and discuss the implications of our
+result for comprehending the $\mathrm{La_3Ni_2O_7}$ superconductivity.",2307.05662v2
+2010-05-28,Spinning compact binary inspiral II: Conservative angular dynamics,"We establish the evolution equations of the set of independent variables
+characterizing the 2PN rigorous conservative dynamics of a spinning compact
+binary, with the inclusion of the leading order spin-orbit, spin-spin and mass
+quadrupole - mass monopole effects, for generic (noncircular, nonspherical)
+orbits. More specifically, we give a closed system of first order ordinary
+differential equations for the orbital elements of the osculating ellipse and
+for the angles characterizing the spin orientations with respect to the
+osculating orbit. We also prove that (i) the relative angle of the spins stays
+constant for equal mass black holes, irrespective of their orientation, and
+(ii) the special configuration of equal mass black holes with equal, but
+antialigned spins, both laying in the plane of motion (leading to the largest
+recoil found in numerical simulations) is preserved at 2PN level of accuracy,
+with leading order spin-orbit, spin-spin and mass quadrupolar contributions
+included.",1005.5330v2
+2020-03-17,Experimental evidence of spin-orbit torque from metallic interfaces,"Spin currents can modify the magnetic state of ferromagnetic ultrathin films
+through spin-orbit torque. They may be generated by means of spin-orbit
+interaction by either bulk or interfacial phenomena. Electrical transport
+measurements reveal a six-fold increase of the spin-orbit torque accompanied by
+a drastic reduction of the spin Hall magnetoresistance upon the introduction of
+a Cu interlayer in a Pt/Cu/Co/Pt structure with perpendicular magnetic
+anisotropy. We analyze the dependence of the spin Hall magnetoresistance with
+the thickness of the interlayer in the frame of a drift diffusion model that
+provides information on the expected spin currents and spin accumulations in
+the system. The results demonstrate that the major responsible of both effects
+is spin memory loss at the interface. The enhancement of the spin-orbit torque
+when introducing an interlayer opens the possibility to design more effient
+spintronic devices based on materials that are cheap and abundant such as
+copper.",2003.07677v1
+2019-09-04,Spin--lattice coupling and the emergence of the trimerized phase in the $S=1$ Kagome antiferromagnet Na$_2$Ti$_3$Cl$_8$,"Spin-1 antiferromagnets are abundant in nature, but few theories or results
+exist to understand their general properties and behavior, particularly in
+situations when geometric frustration is present. Here we study the $S=1$
+Kagome compound Na$_2$Ti$_3$Cl$_8$ using a combination of Density Functional
+Theory, Exact Diagonalization, and Density Matrix Renormalization Group methods
+to achieve a first principles supported explanation of exotic magnetic phases
+in this compound. We find that the effective magnetic Hamiltonian includes
+essential non-Heisenberg terms that do not stem from spin-orbit coupling, and
+both trimerized and spin-nematic magnetic phases are relevant. The
+experimentally observed structural transition to a breathing Kagome phase is
+driven by spin--lattice coupling, which favors the trimerized magnetic phase
+against the quadrupolar one. We thus show that lattice effects can be necessary
+to understand the magnetism in frustrated magnetic compounds, and surmise that
+Na$_2$Ti$_3$Cl$_8$ is a compound which cannot be understood from only
+electronic or only lattice Hamiltonians, very much like VO$_2$.",1909.02020v1
+2012-05-11,Nonequilibrium quantum dynamics of the magnetic Anderson model,"We study the non-equilibrium dynamics of a spinful single-orbital quantum dot
+with an incorporated quantum mechanical spin-1/2 magnetic impurity. Due to the
+spin degeneracy, double occupancy is allowed, and Coulomb interaction together
+with the exchange coupling of the magnetic impurity influence the dynamics. By
+extending the iterative summation of real-time path integrals (ISPI) to this
+coupled system, we monitor the time-dependent non-equilibrium current and the
+impurity spin polarization to determine features of the time-dependent
+non-equilibrium dynamics. We particulary focus on the deep quantum regime,
+where all time and energy scales are of the same order of magnitude and no
+small parameter is available. We observe a significant influence of the
+non-equilibrium decay of the impurity spin polarization both in the presence
+and in the absence of Coulomb interaction. The exponential relaxation is faster
+for larger bias voltages, electron-impurity interactions and temperatures. We
+show that the exact relaxation rate deviates from the corresponding
+perturbative result. In addition, we study in detail the impurity's back action
+on the charge current and find a reduction of the stationary current for
+increasing coupling to the impurity. Moreover, our approach allows us to
+systematically distinguish mean-field Coulomb and impurity effects from the
+influence of quantum fluctuations and flip-flop scattering, respectively. In
+fact, we find a local maximum of the current for a finite Coulomb interaction
+due to the presence of the impurity.",1205.2462v2
+2018-08-21,Single and Double Hole Quantum Dots in Strained Ge/SiGe Quantum Wells,"Even as today's most prominent spin-based qubit technologies are maturing in
+terms of capability and sophistication, there is growing interest in exploring
+alternate material platforms that may provide advantages, such as enhanced
+qubit control, longer coherence times, and improved extensibility. Recent
+advances in heterostructure material growth have opened new possibilities for
+employing hole spins in semiconductors for qubit applications. Undoped,
+strained Ge/SiGe quantum wells are promising candidate hosts for hole
+spin-based qubits due to their low disorder, large intrinsic spin-orbit
+coupling strength, and absence of valley states. Here, we use a simple
+one-layer gated device structure to demonstrate both a single quantum dot as
+well as coupling between two adjacent quantum dots. The hole effective mass in
+these undoped structures, $m$* ~ 0.08 $m$$_0$, is significantly lower than for
+electrons in Si/SiGe, pointing to the possibility of enhanced tunnel couplings
+in quantum dots and favorable qubit-qubit interactions in an
+industry-compatible semiconductor platform.",1808.07077v2
+2021-03-04,Canted antiferromagnetic order and spin dynamics in the honeycomb-lattice Tb2Ir3Ga9,"Single crystal neutron diffraction, inelastic neutron scattering, bulk
+magnetization measurements, and first-principles calculations are used to
+investigate the magnetic properties of the honeycomb lattice $\rm
+Tb_2Ir_3Ga_9$. While the $R\ln2$ magnetic contribution to the low-temperature
+entropy indicates a $\rm J_{eff}=1/2$ moment for the lowest-energy
+crystal-field doublet, the Tb$^{3+}$ ions form a canted antiferromagnetic
+structure below 12.5 K. Due to the Dzyalloshinskii-Moriya interactions, the Tb
+moments in the $ab$ plane are slightly canted towards $b$ by $6^\circ$ with a
+canted moment of 1.22 $\mu_{\rm B} $ per formula unit. A minimal $xxz$ spin
+Hamiltonian is used to simultaneously fit the spin-wave frequencies along the
+high symmetry directions and the field dependence of the magnetization along
+the three crystallographic axes. Long-range magnetic interactions for both
+in-plane and out-of-plane couplings up to the second nearest neighbors are
+needed to account for the observed static and dynamic properties. The $z$
+component of the exchange interactions between Tb moments are larger than the
+$x$ and $y$ components. This compound also exhibits bond-dependent exchange
+with negligible nearest exchange coupling between moments parallel and
+perpendicular to the 4$f$ orbitals. Despite the $J_{{\rm eff}}=1/2$ moments,
+the spin Hamiltonian is denominated by a large in-plane anisotropy $K_z \sim
+-1$ meV. DFT calculations confirm the antiferromagnetic ground state and the
+substantial inter-plane coupling at larger Tb-Tb distances.",2103.03157v1
+2003-09-11,The transition to classical chaos in a coupled quantum system through continuous measurement,"Continuous observation of a quantum system yields a measurement record that
+faithfully reproduces the classically predicted trajectory provided that the
+measurement is sufficiently strong to localize the state in phase space but
+weak enough that quantum backaction noise is negligible. We investigate the
+conditions under which classical dynamics emerges, via continuous position
+measurement, for a particle moving in a harmonic well with its position coupled
+to internal spin. As a consequence of this coupling we find that classical
+dynamics emerges only when the position and spin actions are both large
+compared to $\hbar$. These conditions are quantified by placing bounds on the
+size of the covariance matrix which describes the delocalized quantum coherence
+over extended regions of phase space. From this result it follows that a mixed
+quantum-classical regime (where one subsystem can be treated classically and
+the other not) does not exist for a continuously observed spin 1/2 particle.
+When the conditions for classicallity are satisfied (in the large-spin limit),
+the quantum trajectories reproduce both the classical periodic orbits as well
+as the classically chaotic phase space regions. As a quantitative test of this
+convergence we compute the largest Lyapunov exponent directly from the measured
+quantum trajectories and show that it agrees with the classical value.",0309093v1
+2021-10-07,Spatial aspects of spin polarization of structurally split surface states in thin films with magnetic exchange and spin-orbit interaction,"A theoretical study is presented of the effect of an in-plane magnetic
+exchange field on the band structure of centrosymmetric films of noble metals
+and topological insulators. Based on an ab initio relativistic
+$\mathbf{k}\cdot\mathbf{p}$ theory, a minimal effective model is developed that
+describes two coupled copies of a Rashba or Dirac electronic system residing at
+the opposite surfaces of the film. The coupling leads to a structural gap at
+$\bar{\Gamma}$ and causes an exotic redistribution of the spin density in the
+film when the exchange field is introduced. We apply the model to a
+nineteen-layer Au(111) film and to a five-quintuple-layer Sb$_2$Te$_3$ film. We
+demonstrate that at each film surface the exchange field induces spectrum
+distortions similar to those known for Rashba or Dirac surface states with an
+important difference due to the coupling: At some energies, one branch of the
+state loses its counterpart with the oppositely directed group velocity. This
+suggests that a large-angle electron scattering between the film surfaces
+through the interior of the film is dominant or even the only possible for such
+energies. The spin-density redistribution accompanying the loss of the
+counterpart favors this scattering channel.",2110.03583v2
+2023-09-18,Incorporation of random alloy GaBi$_{x}$As$_{1-x}$ barriers in InAs quantum dot molecules: alloy strain and orbital effects towards enhanced tunneling,"Self-assembled InAs quantum dots (QDs), which have long hole-spin coherence
+times and are amenable to optical control schemes, have long been explored as
+building blocks for qubit architectures. One such design consists of vertically
+stacking two QDs to create a quantum dot molecule (QDM). The two dots can be
+resonantly tuned to form ""molecule-like"" coupled hole states from the
+hybridization of hole states otherwise localized in each respective dot.
+Furthermore, spin-mixing of the hybridized states in dots offset along their
+stacking direction enables qubit rotation to be driven optically, allowing for
+an all-optical qubit control scheme. Increasing the magnitude of this spin
+mixing is important for optical quantum control protocols. To enhance the
+tunnel coupling and spin-mixing across the dots, we introduce Bi in the GaAs
+inter-dot barrier. Previously, we showed how to model InAs/GaBiAs in an
+atomistic tight-binding formalism, and how the dot energy levels are affected
+by the alloy. In this paper, we discuss the lowering of the tunnel barrier,
+which results in a three fold increase of hole tunnel coupling strength in the
+presence of a 7% alloy. Additionally, we show how an asymmetric strain between
+the two dots caused by the alloy shifts the resonance. Finally, we discuss
+device geometries for which the introduction of Bi is most advantageous.",2309.10115v4
+2023-11-28,Deriving quantum spin model for a zigzag-chain ytterbium magnet with anisotropic exchange interactions,"We derive a quantum spin Hamiltonian of the spin-1/2 zigzag chain realized in
+a rare earth ytterbium-based magnetic insulator, YbCuS2. This material
+undergoes a transition at 0.95K to an incommensurate magnetic phase with small
+moments, which does not conform to the nonmagnetic singlet ground state of the
+spin-1/2 Heisenberg model. We take account of octahedral crystal field effect,
+atomic spin-orbit coupling, and strong Coulomb interactions on Yb ions, and
+perform a four-order perturbation theory to evaluate the superexchange coupling
+constants. A small but finite anisotropic exchange coupling called
+{\Gamma}-term appears similarly to the case reported previously in other
+triangular-based magnets. By varying several material parameters, we figure out
+two important factors to enhance {\Gamma}-term. One is the splitting of excited
+f-states with two holes, which efficiently selects the perturbation terms
+associated with the lowest excited state having large total angular momentum,
+and accordingly with high spatial anisotropy. The other is the tilting of
+octahedra or distortion of S-Yb-S bond angle, which break the symmetry of the
+Slater-Koster overlap. These effects are systematically analyzed by the
+exchange anisotropy in units of pairs of octahedra within the local spin frame,
+which significantly reduces the complexity of directly referring to the
+Hamiltonian discussed in the global axis.",2311.16669v1
+2024-01-11,Suppressed Kondo screening in two-dimensional altermagnets,"We have studied the Kondo effect of a spin-1/2 impurity coupled to a
+two-dimensional altermagnet host material. To attain the low-temperature
+many-body Kondo physics of the system, we have performed a numerical
+renormalization group calculations that allows us to access the spectral
+properties of the system at zero temperature. The impurity spectral function
+and the Kondo temperature were calculated for different set of parameters,
+including Rashba spin-orbit coupling (RSOC) and an external magnetic field.
+Interestingly, in the RSOC and altermagnetic fields, the hybridization function
+is spin independent, despite the characteristic broken time-reversal symmetry
+of the altermagnet. This is because the alternating sign of the spin splitting
+of the bands in the momentum space renders equal contributions for both spin
+components of the hybridization function. Our results demonstrate that,
+although the hybridization function is time-reversal symmetric, the Kondo
+temperature is substantially suppressed by the altermagnet coupling. Moreover,
+we have investigated the effect of an external magnetic field applied in the
+altermagnet along different directions. Interestingly, we observe an important
+restraining of the Kondo peak which depends strongly on the direction of the
+field. This anisotropic effect is, however, masked if strong Zeeman splitting
+takes place at the impurity, as it shatters the Kondo-singlet state.",2401.06065v2
+2011-03-03,Impurity effects on semiconductor quantum bits in coupled quantum dots,"We theoretically consider the effects of having unintentional charged
+impurities in laterally coupled two-dimensional double (GaAs) quantum dot
+systems, where each dot contains one or two electrons and a single charged
+impurity in the presence of an external magnetic field. Using molecular orbital
+and configuration interaction method, we calculate the effect of the impurity
+on the 2-electron energy spectrum of each individual dot as well as on the
+spectrum of the coupled-double-dot 2-electron system. We find that the
+singlet-triplet exchange splitting between the two lowest energy states, both
+for the individual dots and the coupled dot system, depends sensitively on the
+location of the impurity and its coupling strength (i.e. the effective charge).
+A strong electron-impurity coupling breaks down equality of the two
+doubly-occupied singlets in the left and the right dot leading to a mixing
+between different spin singlets. As a result, the maximally entangled qubit
+states are no longer fully obtained in zero magnetic field case. Moreover, a
+repulsive impurity results in a triplet-singlet transition as the impurity
+effective charge increases or/and the impurity position changes. We comment on
+the impurity effect in spin qubit operations in the double dot system based on
+our numerical results.",1103.0767v2
+2022-01-17,Chiral multiple-q and skyrmion phases induced by Rashba-Hund interactions in the kagome lattice,"Engineering non trivial topological phases in materials, specially
+skyrmion-like arrangements, has been of great interest in the last decade due
+to its potential technological applications. In this work, we study a model of
+electrons coupled to a magnetic texture in the kagome lattice interacting with
+magnetic moments via Rashba spin orbit coupling in the large Hund interaction
+limit. We obtain the effective spin Hamiltonian and study the emergent low
+temperature phases under an external magnetic field using large scale Monte
+Carlo simulations. We show that strong geometric frustration, characteristic of
+the kagome lattice, and the competition between the effective exchange,
+antisymmetric and anisotropic couplings, gives rise to a large variety of
+non-trivial topological phases. On the one hand, for antiferromagnetic exchange
+coupling a pseudo-antiferromagnetic skyrmion crystal is stabilized for a broad
+range of parameters. As the exchange coupling gets smaller, chiral single-q and
+double-q phases emerge. On the other hand, in the ferromagnetic case, even
+though the competition of the different interactions produce a series of exotic
+textures, a remarkable parallel may be drawn with the pure ferromagnetic model
+with antisymmetric interactions. Finally, for the special case where the
+exchange coupling is completely suppressed, we show that, coming from a higher
+temperature cooperative paramagnet, an ""umbrella-like"" plaquette order with
+semiextensive degeneracy is induced by the external magnetic field.",2201.06668v2
+2007-03-18,Equilibrium spin currents in the Rashba medium,"We analyze equilibrium spin currents in a 2D electron gas with Rashba
+spin-orbit interaction (Rashba medium). In a uniform Rashba medium these
+currents are constant, and their ability to really transport spin is not
+evident. But even weak inhomogeneity of the Rashba medium allows to reveal that
+equilibrium spin currents can transport spin from areas where spin is produced
+to areas where spin is absorbed.",0703468v1
+2009-09-17,Edge spin accumulation: spin Hall effect without bulk spin current,"Spin accumulation in a 2D electron gas with Rashba spin-orbit interaction
+subject to an electric field can take place without bulk spin currents (edge
+spin Hall effect). This is demonstrated for the collisional regime using the
+non-equilibrium distribution function determined from the standard Boltzmann
+equation. Spin accumulation originates from interference of incident and
+reflected electron waves at the sample boundary.",0909.3156v1
+2000-08-15,Electronic Structure and Fermiology of Sr$_3$Ru$_2$O$_7$,"The electronic structure of layered Sr$_{3}$Ru$_{2}$O$_{7}$ in its
+orthorhombic structure is investigated using density functional calculations.
+The band structure near the Fermi energy, consists of Ru $% t_{2g}$ states
+hybridized with O $p$ orbitals. The $yz$ and $xz$ bands, which are largely
+responsible for the nesting related antiferromagnetic spin fluctuations in
+Sr$_{2}$RuO$_{4}$ split pairwise into even and odd combinations due to the
+interlayer coupling reducing the strength of the nesting. The $xy$ bands show
+much less interplanar coupling as expected, and also less $c$-axis dispersion,
+so that the barrel like sections are largely intact compared to the single
+layer material. The zone folding due to orthorhombicity yields small
+cylindrical lens shaped Fermi surfaces centered at the midpoints of the former
+tetragonal $\Gamma -X$ lines. Fixed spin moment calculations indicate that
+tetragonal Sr$_{3}$Ru$_{2}$O$_{7}$ is borderline ferromagnetic but that
+orthorhombicity favors magnetism via a substantial magnetoelastic coupling.
+These results are related to experimental observations particularly in regard
+to magnetic properties.",0008220v1
+2004-11-24,Electronic States and Magnetism of Mn Impurities and Dimers in Narrow-Gap and Wide-Gap III-V Semiconductors,"Electronic states and magnetic properties of single $Mn$ impurity and dimer
+doped in narrow-gap and wide-gap $III$-$V$ semiconductors have been studied
+systematically. It has been found that in the ground state for single $Mn$
+impurity, $Mn$-$As(N)$ complex is antiferromagnetic (AFM) coupling when $p$-$d$
+hybridization $V_{pd}$ is large and both the hole level $E_{v}$ and the
+impurity level $E_{d}$ are close to the midgap; or very weak ferromagnetic (FM)
+when $V_{pd}$ is small and both $E_{v}$ and $E_d$ are deep in the valence band.
+In $Mn$ dimer situation, the $Mn$ spins are AFM coupling for half-filled or
+full-filled $p$ orbits; on the contrast, the Mn spins are double-exchange-like
+FM coupling for any $p$-orbits away from half-filling. We propose the strong
+{\it p-d} hybridized double exchange mechanism is responsible for the FM order
+in diluted $III$-$V$ semiconductors.",0411598v1
+2006-01-25,Anomalous Hall Effect due to the spin chirality in the Kagomé lattice,"We consider a model for a two dimensional electron gas moving on a kagom\'{e}
+lattice and locally coupled to a chiral magnetic texture. We show that the
+transverse conductivity $\sigma\_{xy}$ does not vanish even if spin-orbit
+coupling is not present and it may exhibit unusual behavior. Model parameters
+are the chirality, the number of conduction electrons and the amplitude of the
+local coupling. Upon varying these parameters, a topological transition
+characterized by change of the band Chern numbers occur. As a consequence,
+$\sigma\_{xy}$ can be quantized, proportional to the chirality or have a non
+monotonic behavior upon varying these parameters.",0601583v1
+2006-02-23,Dynamical magneto-electric coupling in helical magnets,"Collective mode dynamics of the helical magnets coupled to electric
+polarization via spin-orbit interaction is studied theoretically. The soft
+modes associated with the ferroelectricity are not the transverse optical
+phonons, as expected from the Lyddane-Sachs-Teller relation, but are the spin
+waves hybridized with the electric polarization. This leads to the Drude-like
+dielectric function $\epsilon(\omega)$ in the limit of zero magnetic
+anisotropy. There are two more low-lying modes; phason of the spiral and
+rotation of helical plane along the polarization axis. The roles of these soft
+modes in the neutron scattering and antiferromagnetic resonance are revealed,
+and a novel experiment to detect the dynamical magneto-electric coupling is
+proposed.",0602547v1
+2002-10-10,Covariant L-S Scheme for the effective N*NM couplings,"For excited nucleon states $N^*$ of arbitrary spin coupling to nucleon (N)
+and meson (M), we propose a Lorentz covariant orbital-spin (L-S) scheme for the
+effective $N^*NM$ couplings. To be used for the partial wave analysis of
+various $N^*$ production and decay processes, it combines merits of two
+conventional schemes, {\sl i.e.}, covariant effective Lagrangian approach and
+multipole analysis with amplitudes expanded according to angular momentum L. As
+examples, explicit formulae are given for $N^*\to N\pi$, $N^*\to N\omega$ and
+$\psi\to N^*\bar N$ processes which are under current experimental studies.",0210164v1
+2010-03-24,Ultrafast Electron Dynamics Theory of Photo-excited Ruthenium Complexes,"An explanation is provided for the ultrafast photo-excited electron dynamics
+in low-spin Ruthenium (II) organic complexes. The experimentally-observed
+singlet to triplet decay in the metal-to-ligand charge-transfer (MLCT) states
+contradicts the expectation that the system should oscillate between the
+singlet and triplet states in the presence of a large spin-orbit coupling and
+the absence of a significance change in metal-ligand bond length. This dilemma
+is solved with a novel quantum decay mechanism that causes a singlet to triplet
+decay in about 300 femtoseconds. The decay is mediated by the triplet
+metal-centered state ($^3$MC) state even though there is no direct coupling
+between the $^1$MLCT and $^3$MC states. The coupling between the $^3$MLCT and
+$^3$MC via excited phonon states leads to vibrational cooling that allows the
+local system to dissipate the excess energy. In the relaxed state, the
+population of the $^3$MC state is low and the metal-ligand bond length is
+almost unchanged with respect to the initial photoexcited state, in agreement
+with experiment.",1003.4752v1
+2010-10-03,Entanglement Transfer via XXZ Heisenberg chain with DM Interaction,"The role of spin-orbit interaction, arises from the Dzyaloshinski-Moriya
+anisotropic antisymmetric interaction, on the entanglement transfer via an
+antiferromagnetic XXZ Heisenberg chain is investigated. From symmetrical point
+of view, the XXZ Hamiltonian with Dzyaloshinski-Moriya interaction can be
+replaced by a modified XXZ Hamiltonian which is defined by a new exchange
+coupling constant and rotated Pauli operators. The modified coupling constant
+and the angle of rotations are depend on the strength of Dzyaloshinski-Moriya
+interaction. In this paper we study the dynamical behavior of the entanglement
+propagation through a system which is consist of a pair of maximally entangled
+spins coupled to one end of the chain. The calculations are performed for the
+ground state and the thermal state of the chain, separately. In both cases the
+presence of this anisotropic interaction make our channel more efficient, such
+that the speed of transmission and the amount of the entanglement are improved
+as this interaction is switched on. We show that for large values of the
+strength of this interaction a large family of XXZ chains becomes efficient
+quantum channels, for whole values of an isotropy parameter in the region $-2
+\leq \Delta \leq 2$.",1010.0387v1
+2013-03-01,Magnetic field dependence of Raman coupling in Alkali atoms,"We calculate the magnetic field dependence of Rabi rates for two-photon
+optical Raman processes in alkali atoms. Due to a decoupling of the nuclear and
+electronic spins, these rates fall with increasing field. At the typical
+magnetic fields of alkali atom Feshbach resonances (B\sim 200G-1200G), the
+Raman rates have the same order of magnitude as their zero field values,
+suggesting one can combine Raman-induced gauge fields/spin-orbital coupling
+with strong Feshbach-induced interactions. The exception is $^6$Li, where there
+is a factor of 7 suppression in the Raman coupling, compared to its already
+small zero-field value.",1303.0061v2
+2014-02-05,Diabolical points in multi-scatterer optomechanical systems,"Diabolical points, which originate from parameter-dependent accidental
+degeneracies of a system's energy levels, have played a fundamental role in the
+discovery of the Berry phase as well as in photonics (conical refraction), in
+chemical dynamics, and more recently in novel materials such as graphene, whose
+electronic band structure possess Dirac points. Here we discuss diabolical
+points in an optomechanical system formed by multiple scatterers in an optical
+cavity with periodic boundary conditions. Such configuration is close to
+experimental setups using micro-toroidal rings with indentations or near-field
+scatterers. We find that the optomechanical coupling is no longer an analytic
+function near the diabolical point and demonstrate the topological phase
+arising through the mechanical motion. Similar to a Fabry-Perot resonator, the
+optomechanical coupling can grow with the number of scatterers. We also
+introduce a minimal quantum model of a diabolical point, which establishes a
+connection to the motion of an arbitrary-spin particle in a 2D parabolic
+quantum dot with spin-orbit coupling.",1402.0926v2
+2014-07-14,Applications of the tensor pomeron model to exclusive central diffractive meson production,"We discuss exclusive central diffractive production of scalar ($f_{0}(980)$,
+$f_{0}(1370)$, $f_{0}(1500)$), pseudoscalar ($\eta$, $\eta'(958)$), and vector
+($\rho^{0}$) mesons in proton-proton collisions. We show that high-energy
+central production of mesons could provide crucial information on the spin
+structure of the soft pomeron. The amplitudes are formulated in terms of
+effective vertices respecting standard rules of Quantum Field Theory and
+propagators for the exchanged pomeron and reggeons. For the scalar and
+pseudoscalar meson production, in most cases, two lowest orbital angular
+momentum - spin couplings are necessary to describe WA102 experimental
+differential distributions. Different pomeron-pomeron-meson tensorial
+(vectorial) coupling structures are possible in general. For the $\rho^{0}$
+production the photon-tensor pomeron/reggeon exchanges are considered and the
+coupling parameters are fixed from the H1 and ZEUS experimental data of the
+$\gamma p \to \rho^{0} p$ reaction. We present first predictions of this
+mechanism for the $pp \to pp (\rho^{0} \to \pi^{+} \pi^{-})$ reaction being
+studied at COMPASS, RHIC, Tevatron, and LHC. We analyse influence of the
+experimental cuts on integrated cross section and various differential
+distributions for produced mesons.",1407.3649v1
+2015-06-01,Lattice correlation of Hubbard excitons in a Mott insulator Sr2IrO4 and reconstruction of their hopping dynamics via time-dependent coherence analysis of the Bragg diffraction,"In correlated oxides the coupling of quasiparticles to other degrees of
+freedom such as spin and lattice plays critical roles in the emergence of
+symmetry-breaking quantum ordered states such as high temperature
+superconductivity. We report a strong lattice coupling of photon induced
+Hubbard excitonic quasiparticles in spin-orbital coupling Mott insulator
+Sr2IrO4. Combining time-resolved optical spectroscopy techniques, we further
+reconstructed spatiotemporal map of the diffusion of quasiparticles via
+time-dependent coherence analysis of the x-ray Bragg diffraction peak. Due to
+the unique electronic configuration of the exciton, the strong lattice
+correlation is unexpected but extends the similarity between Sr2IrO4 and
+cuprates under highly non-equilibrium conditions. The coherence analysis method
+we developed may have important implications for characterizing the structure
+and carrier dynamics in a wider group of oxide heterostructures.",1506.00630v1
+2015-06-10,Quantum Anomalous Hall Effect of Magnetic Topological Insulator Thin Films by Phase Boundary Engineering,"We generalize the topological phase diagram of magnetic topological insulator
+(TI) thin films in an extended parameter space comprising out-of-plane (OP) and
+in-plane (IP) exchange fields in the presence of structural inversion asymmetry
+(SIA) while taking a generic orbital-dependent spin coupling allowed for TIs
+into consideration. The results show that an IP field substantially deforms
+phase boundaries and generically induces the quantum anomalous Hall (QAH)
+effect. For symmetric spin coupling, extremely weak OP and IP exchange fields
+create the QAH state by tuning SIA with a gate bias. For antisymmetric
+coupling, the QAH phase is absent without a strong enough IP field. These
+findings demonstrate that in the thin-film regime, engineering the phase
+boundary is a key process to efficiently realize and manipulate the QAH effect
+for nondissipative electronic applications.",1506.03191v3
+2017-04-05,Spin-Frustrated Pyrochlore Chains in the Volcanic Mineral Kamchatkite (KCu3OCl(SO4)2),"Search of new frustrated magnetic systems is of a significant importance for
+physics studying the condensed matter. The platform for geometric frustration
+of magnetic systems can be provided by copper oxocentric tetrahedra (OCu4)
+forming the base of crystalline structures of copper minerals from Tolbachik
+volcanos in Kamchatka. The present work was devoted to a new frustrated
+antiferromagnetic - kamchatkite (KCu3OCl(SO4)2). The calculation of the sign
+and strength of magnetic couplings in KCu3OCl(SO4)2 has been performed on the
+basis of structural data by the phenomenological crystal chemistry method with
+taking into account corrections on the Jahn-Teller orbital degeneracy of Cu2.
+It has been established that kamchatkite (KCu3OCl(SO4)2) contains AFM
+spin-frustrated chains of the pyrochlore type composed of cone-sharing Cu4
+tetrahedra. Strong AFM intrachain and interchain couplings compete with each
+other. Frustration of magnetic couplings in tetrahedral chains is combined with
+the presence of electric polarization.",1704.01324v3
+2017-10-18,Cluster-glass phase in pyrochlore XY antiferromagnets with quenched disorder,"We study the impact of quenched disorder (random exchange couplings or site
+dilution) on easy-plane pyrochlore antiferromagnets. In the clean system,
+order-by-disorder selects a magnetically ordered state from a classically
+degenerate manifold. In the presence of randomness, however, different orders
+can be chosen locally depending on details of the disorder configuration. Using
+a combination of analytical considerations and classical Monte-Carlo
+simulations, we argue that any long-range-ordered magnetic state is destroyed
+beyond a critical level of randomness where the system breaks into magnetic
+domains due to random exchange anisotropies, becoming, therefore, a glass of
+spin clusters, in accordance with the available experimental data. These random
+anisotropies originate from off-diagonal exchange couplings in the microscopic
+Hamiltonian, establishing their relevance to other magnets with strong
+spin-orbit coupling.",1710.06658v2
+2020-01-30,Fluctuation-driven superconductivity in Sr$_2$RuO$_4$ from weak repulsive interactions,"We provide results for the leading superconducting instabilities for a model
+pertaining to Sr$_2$RuO$_4$ obtained within spin-fluctuation mediated
+superconductivity in the very weak-coupling limit. The theory incorporates
+spin-orbit coupling (SOC) effects both in the band structure and in the pairing
+kernel in the form of associated magnetic anisotropies. The leading
+superconducting phase is found to be $d_{x^2-y^2}$ and a nodal $s$-wave state.
+However, the odd-parity helical solution can become leading either for small
+SOC and Hund's coupling $J$ in the weak $U$-limit, or in the opposite limit
+with large SOC and $J$ at larger values of the Hubbard-$U$. The odd-parity
+chiral solution is never found to be leading. Finally we discuss the form of
+the resulting superconducting spectral gaps in the different explored parameter
+regimes.",2001.11265v1
+2017-04-29,"Observation, Evidence and Origin of Room Temperature Magnetodielectric Effect in Mn doped LaGaO3","We report an observation of room temperature magnetodielectric (RTMD) effect
+in Mn doped LaGaO3. Results of frequency dependent magnetoresistance (FDMR)
+measurements discards the possibility of any magnetoresistive contribution in
+the observed MD effect. The intrinsic nature of MD coupling has been
+validated/evidenced by means of magnetic field dependent Raman spectroscopy and
+explained in terms of modified volume strain governed by magnetic field induced
+rerotation of spin coupled Mn-orbitals. Ultimately, present RTMD effect is
+attributed to magneto-compression/magnetostriction associated with spin-phonon
+coupling as evidenced in the form of magnetic field induced hardening of
+symmetric stretching (SS) MnO6 octahedral Raman modes. Presently studied Mn
+doped LaGaO3 can be a candidate for magnetodielectric applications.",1705.00184v1
+2019-08-30,"Ising superconductors: Interplay of magnetic field, triplet channels, and disorder","We study the superconducting instability in disordered non-centrosymmetric
+monolayers with intrinsic Ising spin-orbit coupling (SOC) subjected to an
+in-plane Zeeman magnetic field. The pairing interaction contains the channels
+allowed by crystal symmetry, such that in general, the pairing state is a
+mixture of singlet and triplet Cooper pairs. The joint action of SOC and Zeeman
+field selects a specific in-plane $\mathbf{d}$-vector triplet component to
+couple with the singlets, which gains robustness against disorder through the
+coupling. The out-of-plane $\mathbf{d}$-vector component, that in the clean
+case is immune to both the Zeeman field and SOC is obliterated by a very small
+impurity scattering rate. We formulate the quasi-classical theory of Ising
+superconductors and solve the linearized Eilenberger equations to obtain the
+pair-breaking equations that determine the Zeeman field -- temperature
+dependence of the continuous superconducting transition. Our discussion
+emphasizes how the Zeeman field, SOC and disorder affect the different
+superconducting order parameters, and we show how the spin-fields inevitably
+induce odd-frequency pairing correlations.",1908.11662v2
+2016-03-24,Composite Topological Excitations in Ferromagnet-Superconductor Heterostructures,"We investigate the formation of a new type of composite topological
+excitation -- the skyrmion-vortex pair (SVP) -- in hybrid systems consisting of
+coupled ferromagnetic and superconducting layers. Spin-orbit interaction in the
+superconductor mediates a magnetoelectric coupling between the vortex and the
+skyrmion, with a sign (attractive or repulsive) that depends on the topological
+indices of the constituents. We determine the conditions under which a bound
+SVP is formed, and characterize the range and depth of the effective binding
+potential through analytical estimates and numerical simulations. Furthermore,
+we develop a semiclassical description of the coupled skyrmion-vortex dynamics
+and discuss how SVPs can be controlled by applied spin currents.",1603.07550v2
+2016-03-30,Implementation of Chiral Quantum Optics with Rydberg and Trapped-ion Setups,"We propose two setups for realizing a chiral quantum network, where two-level
+systems representing the nodes interact via directional emission into discrete
+waveguides, as introduced in T. Ramos et al. [Phys. Rev. A 93, 062104 (2016)].
+The first implementation realizes a spin waveguide via Rydberg states in a
+chain of atoms, whereas the second one realizes a phonon waveguide via the
+localized vibrations of a string of trapped ions. For both architectures, we
+show that strong chirality can be obtained by a proper design of synthetic
+gauge fields in the couplings from the nodes to the waveguide. In the Rydberg
+case, this is achieved via intrinsic spin-orbit coupling in the dipole-dipole
+interactions, while for the trapped ions it is obtained by engineered sideband
+transitions. We take long-range couplings into account that appear naturally in
+these implementations, discuss useful experimental parameters, and analyze
+potential error sources. Finally, we describe effects that can be observed in
+these implementations within state-of-the-art technology, such as the
+driven-dissipative formation of entangled dimer states.",1603.09097v2
+2016-10-26,Spontaneous structural distortion of metallic Shastry-Sutherland system DyB4 by quadrupole-spin-lattice coupling,"DyB4 has a two-dimensional Shastry-Sutherland (Sh-S) lattice with strong
+Ising character of the Dy ions. Despite the intrinsic frustrations,
+surprisingly, it undergoes two successive transitions: a magnetic ordering at
+TN = 20K, and a quadrupole ordering at TQ=12.5 K. From high-resolution neutron
+and synchrotron X-ray powder diffraction studies, we have obtained full
+structural information on this material in all phases, and demonstrate that
+structural modifications occurring at quadrupolar transition lead to the
+lifting of frustrations inherent in the Sh-S model. Our study thus provides a
+complete experimental picture of how the intrinsic frustration of the Sh-S
+lattice can be lifted by the coupling to quadrupole moments. We show that two
+other factors, i.e. strong spin-orbit coupling and long-range RKKY interaction
+in metallic DyB4, play an important role in this behavior.",1610.08215v1
+2018-10-06,Origin of topologically trivial states and topological phase transitions in low-buckled plumbene,"Combining tight-binding (TB) models with first-principles calculations, we
+investigate electronic and topological properties of plumbene. Different from
+the other two-dimensional (2D) topologically nontrivial insulators in group IVA
+(from graphene to stanene), low-buckled plumbene is a topologically trivial
+insulator. The plumbene without spin-orbit coupling exhibits simultaneously two
+kinds of degeneracies, i.e., quadratic non-Dirac and linear Dirac band
+dispersions around the \Gamma and K/K' points, respectively. Our TB model
+calculations show that it is the coupling between the two topological states
+around the \Gamma and K/K' points that triggers the global topologically
+trivial property of plumbene. Quantum anomalous Hall effects with Chern numbers
+of 2 or -2 can be, however, achieved after an exchange field is introduced.
+When the plumbene is functionalized with ethynyl (PbC2H), quantum spin Hall
+effects appear due to the breaking of the coupling effect of the local
+topological states.",1810.02934v1
+2021-12-22,Topological magnon modes on honeycomb lattice with coupling textures,"Topological magnon modes are expected to be useful for novel applications
+such as robust information propagation, since they are immune to backscattering
+and robust against disorder. Although there are several of theoretical
+proposals for topological magnon modes and growing experimental efforts for
+realizing them by now, it is still desirable to add complementary insights on
+this important phenomenon. Here, we propose a new scheme to achieve topological
+magnon where only nearest-neighbour exchange couplings on honeycomb lattice are
+necessary. In both ferromagnets and antiferromagnets, tuning exchange couplings
+between and inside hexagonal unit cells induces a topological state accompanied
+by a band inversion between p-orbital and d-orbital like magnon modes.
+Topological magnon modes appear at the interface between a topological domain
+and a trivial domain with magnon currents, which counterpropagate depending on
+pseudospins originated from orbital angular momenta of magnon modes. This
+mimics the spin-momentum locking phenomenon in the quantum spin Hall effect.",2112.11652v1
+2021-12-28,Two-dimensional Paired Topological Superfluids of Rydberg Fermi Gases,"We systematically investigate the topological properties of spin polarized
+Rydberg-dressed fermionic atoms loaded in a bilayer optical lattice. Through
+tuning the Rydberg coupling strength and the inter-layer tunneling amplitude,
+we identify different types of topological superfluid states generated from the
+inter-layer pairing and relative gauge phase modulation of the couples 2D
+$p$-wave superfluids. These phases includes gapped/gapless with/without time
+reversal symmetry. One of the most interesting states is a gapless paired
+topological superfluid with both the time-reversal symmetry and particle-hole
+symmetry. This state is equivalent to a topological Kondo lattice model with
+the spin-orbit coupling, an in-plane magnetic field, and an additional
+particle-hole symmetry. The flexibility of experimental manipulation in such
+Rydberg-dressed ferminoic systems therefore becomes a promising system for
+realizing interesting topological superfluids.",2112.14027v1
+2022-03-12,Thermal entanglement and quantum coherence of a single electron in a double quantum dot with Rashba Interaction,"In this work, we study the thermal quantum coherence and fidelity in a
+semiconductor double quantum dot. The device consists of a single electron in a
+double quantum dot with Rashba spin-orbit coupling in the presence of an
+external magnetic field. In our scenario, the thermal entanglement of the
+single electron is driven by the charge and spin qubits, the latter controlled
+by Rashba coupling. Analytical expressions are obtained for thermal concurrence
+and correlated coherence using the density matrix formalism. The main goal of
+this work is to provide a good understanding of the effects of temperature and
+several parameters in quantum coherence. In addition, our findings show that we
+can use the Rashba coupling to tune in the thermal entanglement, quantum
+coherence, as well as, the thermal fidelity behavior of the system. Moreover,
+we focus on the role played by thermal entanglement and correlated coherence
+responsible for quantum correlations. We observe that the correlated coherence
+is more robust than the thermal entanglement in all cases, so quantum
+algorithms based only on correlated coherence may be stronger than those based
+on entanglement.",2203.06301v2
+2022-04-07,Topological multiferroic order in twisted transition metal dichalcogenide bilayers,"Layered van der Waals materials have risen as powerful platforms to
+artificially engineer correlated states of matter. Here we show the emergence
+of a multiferroic order in a twisted dichalcogenide bilayer superlattice at
+quarter-filling. We show that the competition between Coulomb interactions
+leads to the simultaneous emergence of ferrimagnetic and ferroelectric orders.
+We derive the magnetoelectric coupling for this system, which leads to a direct
+strong coupling between the charge and spin orders. We show that, due to
+intrinsic spin-orbit coupling effects, the electronic structure shows a
+non-zero Chern number, thus displaying a topological multiferroic order. We
+show that this topological state gives rise to interface modes at the different
+magnetic and ferroelectric domains of the multiferroic. We demonstrate that
+these topological modes can be tuned with external electric fields as well as
+triggered by supermoire effects generated by a substrate. Our results put
+forward twisted van der Waals materials as a potential platform to explore
+multiferroic symmetry breaking orders and, ultimately, controllable topological
+excitations in magnetoelectric domains.",2204.03360v2
+2022-04-27,Accurate core excitation and ionization energies from a state-specific coupled-cluster singles and doubles approach,"We investigate the use of orbital-optimized references in conjunction with
+single-reference coupled-cluster theory with single and double substitutions
+(CCSD) for the study of core excitations and ionizations of 18 small organic
+molecules, without any use of response theory or equation-of-motion formalisms.
+Three schemes are employed to successfully address the convergence difficulties
+associated with the coupled-cluster equations, and the spin contamination
+resulting from the use of a spin symmetry-broken reference, in the case of
+excitations. In order to gauge the inherent potential of the methods studied,
+an effort is made to provide reasonable basis set limit estimates for the
+transition energies. Overall, we find that the two best-performing schemes
+studied here for Delta-CCSD are capable of predicting excitation and ionization
+energies with errors comparable to experimental accuracies. The proposed
+Delta-CCSD schemes seem to fare better than the widely used equation-of-motion
+CCSD (EOM-CCSD) with core-valence separation protocol, with statistical errors
+being reduced by more than a factor of two when compared to FC-CVS-EOM-CCSD.",2204.13056v2
+2023-06-30,Achiral dipoles on a ferromagnet can affect its magnetization direction,"We demonstrate the possibility of a coupling between the magnetization
+direction of a ferromagnet and the tilting angle of adsorbed achiral molecules.
+To illustrate the mechanism of the coupling, we analyze a minimal Stoner model
+that includes Rashba spin-orbit coupling due to the electric field on the
+surface of the ferromagnet. The proposed mechanism allows us to study magnetic
+anisotropy of the system with an extended Stoner-Wohlfarth model, and argue
+that adsorbed achiral molecules can change magnetocrystalline anisotropy of the
+substrate. Our research's aim is to motivate further experimental studies of
+the current-free chirality induced spin selectivity effect involving both
+enantiomers.",2306.17592v2
+2023-08-15,Controlling Majorana hybridization in magnetic chain-superconductor systems,"We propose controlling the hybridization between Majorana zero modes at the
+ends of magnetic adatom chains on superconductors by an additional magnetic
+adatom deposited close by. By tuning the additional adatom's magnetization,
+position, and coupling to the superconductor, we can couple and decouple the
+Majorana modes as well as control the ground state parity. The scheme is
+independent of microscopic details in ferromagnetic and helical magnetic chains
+on superconductors with and without spin-orbit coupling, which we show by
+studying their full microscopic models and their common low-energy description.
+Our results show that scanning tunneling microscopy and electron spin resonance
+techniques are promising tools for controlling the Majorana hybridization in
+magnetic adatoms-superconductor setups, providing a basis for Majorana parity
+measurements, fusion, and braiding techniques.",2308.07961v2
+2023-10-06,Spin-Mediated Direct Photon Scattering by Plasmons in BiTeI,"We use polarization resolved Raman spectroscopy to demonstrate that for a 3D
+giant Rashba system the bulk plasmon collective mode can directly couple to the
+Raman response even in the long wavelength $\mathbf q \rightarrow 0$ limit.
+Although conventional theory predicts the plasmon spectral weight to be
+suppressed as the square of its quasi-momentum and thus negligibly weak in the
+Raman spectra, we observe a sharp in-gap plasmon mode in the Raman spectrum of
+BiTeI below the Rashba continuum. This coupling, in a polar system with
+spin-orbit coupling, occurs without assistance from phonons when the incoming
+photon excitation is resonant with Rashba-split intermediate states. We discuss
+the distinctive features of BiTeI's giant Rashba system band structure that
+enable the direct observation of plasmon in Raman scattering.",2310.04394v2
+2023-10-12,Effective potential engineering by emergent anisotropy in a tunable open-access microcavity,"Photonic spin-orbit (SO) coupling is an important physical mechanism leading
+to numerous interesting phenomena in the systems of microcavity photons and
+exciton-polaritons. We report the effect of SO coupling in a tunable
+open-access microcavity embedded with anisotropic active media. The SO coupling
+associated with the TE-TM splitting results in an emergent anisotropy, which
+further leads to fine energy splittings allowing clear observation of the full
+set of eigenstates, in sharp contrast with the isotropic situation which leads
+to the isotropic eigenstates of spin vortices. We show that the photonic
+potential can be engineered by playing with the relation between the emergent
+anisotropy and the cavity ellipticity. All the experimental results are well
+reproduced by the degenerate perturbation theory. Our results constitute a
+significant extension to the research field of microcavity spinoptronics, with
+potential applications in polarization control and optical property measurement
+of photonic devices and materials.",2310.08024v1
+2024-03-25,Rotational Doppler Effect and Spin-Rotation Coupling,"The Rotational Doppler Effect (RDE) involves both the orbital angular
+momentum of electromagnetic radiation as well as its helicity. The RDE
+phenomena associated with photon helicity go beyond the standard theory of
+relativity. The purpose of this paper is to elucidate the theoretical basis of
+the helicity-dependent RDE in terms of the general phenomenon of spin-rotation
+coupling. The physical implications of this coupling are briefly pointed out
+and the nonlocal theory of rotating observers is described. For an observer
+rotating uniformly about the direction of incidence of a plane wave of definite
+helicity, the nonlocally measured amplitude of the wave is larger (smaller) if
+the observer rotates in the same (opposite) sense as the electromagnetic field.
+The implications of the nonlocal helicity dependence of the measured amplitude
+of the radiation are briefly discussed.",2403.17151v1
+2012-08-30,Spin Evolution of Supermassive Black Holes and Galactic Nuclei,"The spin angular momentum S of a supermassive black hole (SBH) precesses due
+to torques from orbiting stars, and the stellar orbits precess due to dragging
+of inertial frames by the spinning hole. We solve the coupled post-Newtonian
+equations describing the joint evolution of S and the stellar angular momenta
+Lj, j = 1...N in spherical, rotating nuclear star clusters. In the absence of
+gravitational interactions between the stars, two evolutionary modes are found:
+(1) nearly uniform precession of S about the total angular momentum vector of
+the system; (2) damped precession, leading, in less than one precessional
+period, to alignment of S with the angular momentum of the rotating cluster.
+Beyond a certain distance from the SBH, the time scale for angular momentum
+changes due to gravitational encounters between the stars is shorter than
+spin-orbit precession times. We present a model, based on the
+Ornstein-Uhlenbeck equation, for the stochastic evolution of star clusters due
+to gravitational encounters and use it to evaluate the evolution of S in nuclei
+where changes in the Lj are due to frame dragging close to the SBH and to
+encounters farther out. Long-term evolution in this case is well described as
+uniform precession of the SBH about the cluster's rotational axis, with an
+increasingly important stochastic contribution when SBH masses are small. Spin
+precessional periods are predicted to be strongly dependent on nuclear
+properties, but typical values are 10-100 Myr for low-mass SBHs in dense
+nuclei, 100 Myr - 10 Gyr for intermediate mass SBHs, and > 10 Gyr for the most
+massive SBHs. We compare the evolution of SBH spins in stellar nuclei to the
+case of torquing by an inclined, gaseous accretion disk.",1208.6274v1
+2022-01-18,On-demand electrical control of spin qubits,"Once called a ""classically non-describable two-valuedness"" by Pauli , the
+electron spin is a natural resource for long-lived quantum information since it
+is mostly impervious to electric fluctuations and can be replicated in large
+arrays using silicon quantum dots, which offer high-fidelity control.
+Paradoxically, one of the most convenient control strategies is the integration
+of nanoscale magnets to artificially enhance the coupling between spins and
+electric field, which in turn hampers the spin's noise immunity and adds
+architectural complexity. Here we demonstrate a technique that enables a
+\emph{switchable} interaction between spins and orbital motion of electrons in
+silicon quantum dots, without the presence of a micromagnet. The naturally weak
+effects of the relativistic spin-orbit interaction in silicon are enhanced by
+more than three orders of magnitude by controlling the energy quantisation of
+electrons in the nanostructure, enhancing the orbital motion. Fast electrical
+control is demonstrated in multiple devices and electronic configurations,
+highlighting the utility of the technique. Using the electrical drive we
+achieve coherence time $T_{2,{\rm Hahn}}\approx50 \mu$s, fast single-qubit
+gates with ${T_{\pi/2}=3}$ ns and gate fidelities of 99.93 % probed by
+randomised benchmarking. The higher gate speeds and better compatibility with
+CMOS manufacturing enabled by on-demand electric control improve the prospects
+for realising scalable silicon quantum processors.",2201.06679v2
+2007-12-10,Quantum well states in Fe/Nb(001) multilayers: First principles study,"We present a first-principles study to understand the phenomena of interlayer
+exchange coupling in Fe/Nb multilayers using the linearized-muffin-tin-orbitals
+method within the generalized gradient approximation. We find that the exchange
+coupling oscillates with both short and long periodicities, which have been
+examined in terms of the Ruderman-Kittel-Kasuya-Yosida (RKKY) model as well as
+the quantum well (QW) model. We have investigated the behavior of the exchange
+coupling by artificially varying moments of Fe atoms in ferromagnetic layers.
+For a small moment of Fe, the coupling shows bilinearity in the magnetic
+moments, implying its RKKY character. However, at higher moments close to that
+of bulk Fe, the saturation of long-period oscillations is in accordance with
+the QW model. Quantum well dispersions around the Fermi level demonstrate that
+the majority-spin bands contribute largely to the formation of quantum well
+states, which we analyze quantitatively by making use of the phase accumulation
+model. Our analysis indicates that the quantum well model gives a better
+description of the oscillatory behavior of the exchange coupling in Fe/Nb
+multilayers.",0712.1432v1
+2010-07-08,Neutron and ARPES Constraints on the Couplings of the Multiorbital Hubbard Model for the Pnictides,"The results of neutron scattering and angle-resolved photoemission
+experiments for the Fe-pnictide parent compounds, and their metallic nature,
+are shown to impose severe constraints on the range of values that can be
+considered ""realistic"" for the intraorbital Hubbard repulsion U and Hund
+coupling J in multiorbital Hubbard models treated in the mean-field
+approximation. Phase diagrams for three- and five-orbital models are here
+provided, and the physically realistic regime of couplings is highlighted, to
+guide future theoretical work into the proper region of parameters of Hubbard
+models. In addition, using the random phase approximation, the pairing
+tendencies in these realistic coupling regions are investigated. It is shown
+that the dominant spin-singlet pairing channels in these coupling regimes
+correspond to nodal superconductivity, with strong competition between several
+states that belong to different irreducible representations. This is compatible
+with experimental bulk measurements that have reported the existence of nodes
+in several Fe-pnictide compounds.",1007.1436v3
+2013-04-24,Graphene-mediated exchange coupling between cobaltocene and magnetic substrates,"Using first-principles calculations we demonstrate sizable exchange coupling
+between a magnetic molecule and a magnetic substrate via a graphene layer. As a
+model system we consider cobaltocene (CoCp$_2$) adsorbed on graphene deposited
+on Ni(111). We find that the magnetic coupling between the molecule and the
+substrate is antiferromagnetic and varies considerably depending on the
+molecule structure, the adsorption geometry, and the stacking of graphene on
+Ni(111). We show how this coupling can be tuned by intercalating a magnetic
+monolayer, e.g. Fe or Co, between graphene and Ni(111). We identify the leading
+mechanism responsible for the coupling to be the spatial and energy matching of
+the frontier orbitals of CoCp$_2$ and graphene close to the Fermi level, and we
+demonstrate the role of graphene as an electronic decoupling layer, yet
+allowing spin communication between molecule and substrate.",1304.6665v1
+2014-09-05,Long-range magnetic interaction and frustration in double perovskite Sr$_{2}$NiIrO$_{6}$,"Sr$_{2}$NiIrO$_{6}$ would be a ferromagnetic (FM) insulator in terms of the
+common superexchange mechanism between the first nearest neighboring (1NN)
+magnetic ions Ni$^{2+}$ ($t_{2g}^{6}e_{g}^{2}$) and Ir$^{6+}$ ($t_{2g}^{3}$).
+However, the observed antiferromagnetic (AF) order questions this viewpoint. In
+this work, we present first-principles calculations and find that while the 1NN
+Ni$^{2+}$-Ir$^{6+}$ exchange is indeed FM, the 2NN and 3NN couplings in the fcc
+Ir (and Ni) sublattice are AF. Moreover, the 2NN AF Ir-Ir coupling turns out to
+be even stronger than the 1NN FM Ni-Ir coupling, thus giving rise to a magnetic
+frustration. Sr$_{2}$NiIrO$_{6}$ hence becomes a distorted low-temperature
+antiferromagnet. Naturally, a very similar magnetic property in
+Sr$_{2}$ZnIrO$_{6}$ can be explained by the frustrated AF coupling in the fcc
+Ir$^{6+}$ sublattice. This work highlights the long-range magnetic interaction
+of the delocalized $5d$ electrons, and also addresses why the spin-orbit
+coupling is ineffective here.",1409.1688v1
+2016-04-12,"EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions","The EPW (Electron-Phonon coupling using Wannier functions) software is a
+Fortran90 code that uses density-functional perturbation theory and maximally
+localized Wannier functions for computing electron-phonon couplings and related
+properties in solids accurately and efficiently. The EPW v4 program can be used
+to compute electron and phonon self-energies, linewidths, electron-phonon
+scattering rates, electron-phonon coupling strengths, transport spectral
+functions, electronic velocities, resistivity, anisotropic superconducting gaps
+and spectral functions within the Migdal-Eliashberg theory. The code now
+supports spin-orbit coupling, time-reversal symmetry in non-centrosymmetric
+crystals, polar materials, and $\mathbf{k}$ and $\mathbf{q}$-point
+parallelization. Considerable effort was dedicated to optimization and
+parallelization, achieving almost a ten times speedup with respect to previous
+releases. A computer test farm was implemented to ensure stability and
+portability of the code on the most popular compilers and architectures. Since
+April 2016, version 4 of the EPW code is fully integrated in and distributed
+with the Quantum ESPRESSO package, and can be downloaded through QE-forge at
+http://qe-forge.org/gf/project/q-e.",1604.03525v2
+2010-05-17,Electronic structure and magnetic state of transuranium metals under pressure,"Electronic structure of bcc Np, fcc Pu, Am, and Cm pure metals under pressure
+has been investigated employing the LDA+U method with spin-orbit coupling
+(LDA+U+SO). Magnetic state of the actinide ions was analyzed in both LS and jj
+coupling schemes to reveal the applicability of corresponding coupling bases.
+It was demonstrated that whereas Pu and Am are well described within the jj
+coupling scheme, Np and Cm can be described appropriately neither in {m-sigma},
+nor in {jmj} basis, due to intermediate coupling scheme realizing in these
+metals that requires some finer treatment. The LDA+U+SO results for the
+considered transuranium metals reveal bands broadening and gradual 5f electron
+delocalization under pressure.",1005.2851v1
+2014-06-30,Nanophotonic control of circular dipole emission: toward a scalable solid-state to flying-qubits interface,"Controlling photon emission by single quantum emitters with nanostructures is
+crucial for scalable on-chip quantum information processing. Nowadays
+nanoresonators can affect the lifetime of emitters and ultimately induce strong
+coupling between the emitters and the light field, while nanoantennas can
+control the directionality of the emission. Expanding this control to the
+manipulation of the emission of orbital angular momentum-changing transitions
+would enable coupling between long-lived solid-state qubits and flying qubits.
+As these transitions are associated with circular rather than linear dipoles,
+such control requires detailed knowledge of the spatially dependent interaction
+of a complex dipole with highly structured optical eigenstates containing local
+helicity. Using a classical analogue, we experimentally map the coupling of
+circular dipoles to photonic modes in a model structure, a photonic crystal
+waveguide. We show that depending on the local helicity the dipoles can be made
+to couple to modes either propagating to the left or to the right. The maps are
+in excellent agreement with calculations. Our measurements, therefore,
+demonstrate the coupling of spin to photonic pathway with near-unity (0.8 $\pm$
+0.1) efficiency.",1406.7741v2
+2016-03-31,Dirac Hamiltonian and Reissner-Nordstrom Metric: Coulomb Interaction in Curved Space-Time,"We investigate the spin-1/2 relativistic quantum dynamics in the curved
+space-time generated by a central massive charged object (black hole). This
+necessitates a study of the coupling of a Dirac particle to the
+Reissner-Nordstrom space-time geometry and the simultaneous covariant coupling
+to the central electrostatic field. The relativistic Dirac Hamiltonian for the
+Reissner-Nordstrom geometry is derived. A Foldy-Wouthuysen transformation
+reveals the presence of gravitational, and electro-gravitational spin-orbit
+coupling terms which generalize the Fokker precession terms found for the
+Dirac-Schwarzschild Hamiltonian, and other electro-gravitational correction
+terms to the potential proportional to alpha^n G, where alpha is the
+fine-structure constant, and G is the gravitational coupling constant. The
+particle-antiparticle symmetry found for the Dirac-Schwarzschild geometry (and
+for other geometries which do not include electromagnetic interactions) is
+shown to be explicitly broken due to the electrostatic coupling. The resulting
+spectrum of radially symmetric, electrostatically bound systems (with
+gravitational corrections) is evaluated for example cases.",1603.09668v1
+2022-03-02,Strong and tunable magnetoelectric coupling in 2D trilayer heterostructures,"The quest for electric-field control of nanoscale magnetic states such as
+skyrmions, which would impact the field of spintronics, has led to a
+challenging search for multiferroic materials or structures with strong
+magnetoelectric coupling and efficient electric-field control. Here we report a
+theoretical prediction that such phenomena can be realized in two-dimensional
+(2D) bilayer FE/PMM and trilayer FE/PMM/FE heterostructures (two-terminal and
+three-terminal devices), where FE is a 2D ferroelectric and PMM is a polar
+magnetic metal with strong spin-orbit coupling. Such a PMM has strong
+Dzyaloshinskii-Moriya interactions (DMI) that can generate skyrmions, while the
+FE can generate strong magnetoelectric coupling through
+polarization-polarization interactions. In trilayer heterostructures, contact
+to the metallic PMM layer enables multiple polarization configurations for
+electric-field control of skyrmions. We report density-functional-theory
+calculations for particular material choices that demonstrate the effectiveness
+of these arrangements, with the key driver being the polarization-polarization
+interactions between the PMM and FE layers. The present findings provide a
+method to achieve strong magnetoelectric coupling in the 2D limit and a new
+perspective for the design of related spintronics.",2203.00884v2
+2022-06-30,Uncertainty quantification of transition operators in the empirical shell model,"While empirical shell model calculations have successfully described
+low-lying nuclear data for decades, only recently has significant effort been
+made to quantify the uncertainty in such calculations. Here we quantify the
+statistical error in effective parameters for transition operators in empirical
+calculations in the $sd$ ($1s_{1/2}$-$0d_{3/2}$-$0d_{5/2}$) valence space,
+specifically the quenching of Gamow-Teller transitions, effective charges for
+electric quadrupole (E2) transitions, and the effective orbital and spin
+couplings for magnetic dipole (M1) transitions. We find the quenching factor
+for Gamow-Teller transitions relative to free-space values is tightly
+constrained and that the isoscalar coupling of E2 is much more tightly
+constrained than the isovector coupling. For effective M1 couplings, we found
+isovector components more constrained than isoscalar, but that to get any
+sensible result we had to fix one of four couplings. This detailed
+quantification of uncertainties, while highly empirical, nonetheless is an
+important step towards interpretation of experiments.",2206.14956v2
+2008-09-18,Isospin phases of vertically coupled double quantum rings under the influence of perpendicular magnetic fields,"Vertically coupled double quantum rings submitted to a perpendicular magnetic
+field $B$ are addressed within the local spin-density functional theory. We
+describe the structure of quantum ring molecules containing up to 40 electrons
+considering different inter-ring distances and intensities of the applied
+magnetic field. When the rings are quantum mechanically strongly coupled, only
+bonding states are occupied and the addition spectrum of the artificial
+molecules resembles that of a single quantum ring, with some small differences
+appearing as an effect of the magnetic field. Despite the latter has the
+tendency to flatten the spectra, in the strong coupling limit some clear peaks
+are still found even when $B\neq 0$ that can be interpretated from the
+single-particle energy levels analogously as at zero applied field, namely in
+terms of closed-shell and Hund's-rule configurations. Increasing the inter-ring
+distance, the occupation of the first antibonding orbitals washes out such
+structures and the addition spectra become flatter and irregular. In the weak
+coupling regime, numerous isospin oscillations are found as a function of $B$.",0809.3103v1
+2016-07-31,The twofold diabatization of the KRb $(1\sim 2)^1Π$ complex in the framework of \emph{ab initio} and deperturbation approaches,"We performed a diabatization of the mutually perturbed $1^1\Pi$ and $2^1\Pi$
+states of KRb based on both electronic structure calculation and direct
+coupled-channel deperturbation analysis of experimental energies. The potential
+energy curves (PECs) of the diabatic states and their scalar coupling were
+constructed from the \textit{ab initio} adiabatic PECs by analytically
+integrating the radial $\langle \psi_1^{ad}|\partial /\partial
+R|\psi_2^{ad}\rangle$ matrix element obtained by a finite-difference method.
+The diabatic potentials and electronic coupling function were refined by the
+least squares fitting of the rovibronic termvalues of the $1^1\Pi\sim 2^1\Pi$
+complex. The empirical PECs combined with the coupling function as well as the
+diabatized spin-orbit coupling and transition dipole matrix elements are useful
+for further deperturbation treatment of both singlet and triplet states
+manifold.",1608.00225v1
+2017-12-11,Critical phenomena at the complex tensor ordering phase transition,"We investigate the critical properties of the phase transition towards
+complex tensor order that has been proposed to occur in spin-orbit coupled
+superconductors. For this purpose we formulate the bosonic field theory for
+fluctuations of the complex irreducible second-rank tensor order parameter
+close to the transition. We then determine the scale dependence of the
+couplings of the theory by means of the perturbative Renormalization Group
+(RG). For the isotropic system we generically detect a fluctuation-induced
+first-order phase transition. The initial values for the running couplings are
+determined by the underlying microscopic model for the tensorial order. As an
+example we study three-dimensional Luttinger semimetals with electrons at a
+quadratic band touching point. Whereas the strong-coupling transition of the
+model receives substantial fluctuation corrections, the weak-coupling
+transition at low temperatures is rendered only weakly first-order due to the
+presence of a fixed point in the vicinity of the RG trajectory. If the number
+of fluctuating complex components of the order parameter is reduced by cubic
+anisotropy, the theory maps onto the field theory for frustrated magnetism.",1712.03981v2
+2018-03-30,Interstate Vibronic Coupling Constants Between Electronic Excited States for Complex Molecules,"In the construction of diabatic vibronic Hamiltonians for quantum dynamics in
+the excited-state manifold of molecules, the coupling constants are often
+extracted solely from information on the excited-state energies. Here, a new
+protocol is applied to get access to the interstate vibronic coupling constants
+at the time-dependent density functional theory level through the overlap
+integrals between excited-state adiabatic auxiliary wavefunctions. We discuss
+the advantages of such method and its potential for future applications to
+address complex systems, in particular those where multiple electronic states
+are energetically closely lying and interact. As examples, we apply the
+protocol to the study of prototype rhenium carbonyl complexes
+[Re(CO)$_3$(N,N)(L)]$^{n+}$ for which non-adiabatic quantum dynamics within the
+linear vibronic coupling model and including spin-orbit coupling have been
+reported recently.",1803.11360v1
+2018-06-09,Effective Long-Range Pairing and Hopping in Topological Nanowires Weakly Coupled to $ s $-Wave Superconductors,"In this Letter, we first formulate an effective theory, which generally
+captures long-range proximity effects of a surface system weakly coupled to an
+s-wave superconductor. The long-range proximity effects include both the
+emergent long-range pairing and hopping interactions in the surface system. We
+then model the Rashba spin-orbit-coupled nanowire in proximity with an s-wave
+superconductor by taking into account the emergent nonlocal effects in the
+weak-coupling limit. In this limit the induced superconducting pair potential
+is found much smaller than that of the host superconductor, which is in good
+agreement with recent experiments. Compared with the previously considered
+strong coupling limit with local proximity effects, the long-range interactions
+can significantly modify the topological phase diagram, and considerably lower
+the threshold magnetic field for the emergence of Majorana zero modes.",1806.03399v1
+2018-07-25,Tuning of non-paraxial effects of the Laguerre-Gaussian beam interacting with the two-component Bose-Einstein condensates,"We present the theory of microscopic interaction of the spin-orbit coupled
+focused Laguerre-Gaussian (LG) beam with the two-component Bose-Einstein
+condensate (BEC), composed of two hyperfine states of $^{87}$Rb in a harmonic
+trap. We have shown that Raman Rabi frequency distributions over the
+inter-component coupling identify phase separation coupling strength. A
+significant enhancement of side-band transitions due to non-paraxial nature of
+vortex beam is observed for particular values of inter-component coupling
+around 1.25 and 0.64 in unit of 5.5nm for $10^5$ and $10^6$ number of atoms,
+respectively. The uncertainty in the estimation of these coupling strengths is
+improved with the focusing angles of the beam. We discuss an experimental
+scheme to verify this non-paraxial effect on ultra-cold atoms.",1807.09733v2
+2022-12-22,Reducing the frequency of the Higgs mode in a helical superconductor coupled to an LC-circuit,"We show that the amplitude, or Higgs mode of a superconductor with strong
+spin-orbit coupling and an exchange field, couples linearly to the
+electromagnetic field. Furthermore, by coupling such a superconductor to an LC
+resonator, we demonstrate that the Higgs resonance becomes a regular mode at
+frequencies smaller than the quasiparticle energy threshold $2\Delta$. We
+finally propose and discuss a possible experiment based on microwave
+spectroscopy for an unequivocal detection of the Higgs mode. Our approach may
+allow visualizing Higgs modes also in more complicated multiband
+superconductors with a coupling between the charge and other electronic degrees
+of freedom.",2212.11615v1
+2023-02-19,Anharmonic electron-phonon coupling in ultrasoft and locally disordered perovskites,"Anharmonicity and local disorder (polymorphism) are ubiquitous in perovskite
+physics, inducing various phenomena observed in scattering and spectroscopy
+experiments. Several of these phenomena still lack interpretation from
+first-principles since, hitherto, no approach is available to account for
+anharmonicity and disorder in electron-phonon couplings. Here, relying on the
+special displacement method, we develop a unified treatment of both and
+demonstrate that electron-phonon coupling is strongly influenced when we employ
+polymorphous perovskite networks. We uncover that polymorphism in halide
+perovskites leads to vibrational dynamics far from the ideal noninteracting
+phonon picture and drives the gradual change in their band gap around phase
+transition temperatures. We also clarify that combined band gap corrections
+arising from disorder, spin-orbit coupling, exchange-correlation functionals of
+high accuracy, and electron-phonon coupling are all essential. Our findings
+agree with experiments, suggesting that polymorphism is the key to address
+pending questions on perovskites' technological applications.",2302.09625v2
+2005-07-06,The free precession and libration of Mercury,"An analysis based on the direct torque equations including tidal dissipation
+and a viscous core-mantle coupling is used to determine the damping time scales
+of O(10^5) years for free precession of the spin about the Cassini state and
+free libration in longitude for Mercury. The core-mantle coupling dominates the
+damping over the tides by one to two orders of magnitude for the plausible
+parameters chosen. The short damping times compared with the age of the solar
+system means we must find recent or on-going excitation mechanisms if such free
+motions are found by the current radar experiments or the future measurement by
+the MESSENGER and BepiColombo spacecraft that will orbit Mercury. We also show
+that the average precession rate is increased by about 30% over that obtained
+from the traditional precession constant because of a spin-orbit resonance
+induced contribution by the C_{22} term in the expansion of the gravitational
+field. The C_{22} contribution also causes the path of the spin during the
+precession to be slightly elliptical with a variation in the precession rate
+that is a maximum when the obliquity is a minimum. An observable free
+precession will compromise the determination of obliquity of the Cassini state
+and hence of C/MR^2 for Mercury, but a detected free libration will not
+compromise the determination of the forced libration amplitude and thus the
+verification of a liquid core",0507117v1
+2009-09-10,Transverse force generated by an electric field and transverse charge imbalance in spin-orbit coupled systems,"We use linear response theory to study the transverse force generated by an
+external electric field and hence possible charge Hall effect in spin-orbit
+coupled systems. In addition to the Lorentz force that is parallel to the
+electric field, we find that the transverse force perpendicular to the applied
+electric field may not vanish in a system with an anisotropic energy
+dispersion. Surprisingly, in contrast to the previous results, the transverse
+force generated by the electric field does not depend on the spin current, but
+in general, it is related to the second derivative of energy dispersion only.
+Furthermore, we find that the transverse force does not vanish in the
+Rashba-Dresselhaus system. Therefore, the non-vanishing transverse force acts
+as a driving force and results in charge imbalance at the edges of the sample.
+The estimated ratio of the Hall voltage to the longitudinal voltage is $\sim
+10^{-3}$. The disorder effect is also considered in the study of the
+Rashba-Dresselhaus system. We find that the transverse force vanishes in the
+presence of impurities in this system because the vertex correction and the
+anomalous velocity of the electron accidently cancel each other.",0909.1979v1
+2011-08-15,Low-energy effective Hamiltonian involving spin-orbit coupling in Silicene and Two-Dimensional Germanium and Tin,"Starting from the symmetry aspects and tight-binding method in combination
+with first-principles calculation, we systematically derive the low-energy
+effective Hamiltonian involving spin-orbit coupling (SOC) for silicene, which
+is very general because this Hamiltonian applies to not only the silicene
+itself but also the low-buckled counterparts of graphene for other group IVA
+elements Ge and Sn, as well as graphene when the structure returns to the
+planar geometry. The effective Hamitonian is the analogue to the first graphene
+quantum spin Hall effect (QSHE) Hamiltonian. Similar to graphene model, the
+effective SOC in low-buckled geometry opens a gap at Dirac points and
+establishes QSHE. The effective SOC actually contains first order in the atomic
+intrinsic SOC strength $\xi_{0}$, while such leading order contribution of SOC
+vanishes in planar structure. Therefore, silicene as well as low-buckled
+counterparts of graphene for other group IVA elements Ge and Sn has much larger
+gap opened by effective SOC at Dirac points than graphene due to low-buckled
+geometry and larger atomic intrinsic SOC strength. Further, the more buckled is
+the structure, the greater is the gap. Therefore, QSHE can be observed in
+low-buckled Si, Ge, and Sn systems in an experimentally accessible temperature
+regime. In addition, the Rashba SOC in silicene is intrinsic due to its own
+low-buckled geometry, which vanishes at Dirac point $K$, while has nonzero
+value with $\vec{k}$ deviation from the $K$ point. Therefore, the QSHE in
+silicene is robust against to the intrinsic Rashba SOC.",1108.2933v1
+2012-09-26,Significance of dressed molecules in a quasi-two-dimensional polarized Fermi gas,"We investigate the properties of a spin-orbit coupled quasi-two-dimensional
+Fermi gas with tunable s-wave interaction between the two spin species. By
+analyzing the two-body bound state, we find that the population of the excited
+states in the tightly-confined axial direction can be significant when the
+two-body binding energy becomes comparable or exceeds the axial confinement.
+Since the Rashba spin-orbit coupling that we study here tends to enhance the
+two-body binding energy, this effect can become prominent at unitarity or even
+on the BCS side of the Feshbach resonance. To study the impact of these excited
+modes along the third dimension, we adopt an effective two-dimensional
+Hamiltonian in the form of a two-channel model, where the dressed molecules in
+the closed channel consist of the conventional Feshbach molecules as well as
+the excited states occupation in the axial direction. With properly
+renormalized interactions between atoms and dressed molecules, we find that
+both the density distribution and the phase structure in the trap can be
+significantly modified near a wide Feshbach resonance. In particular, the
+stability region of the topological superfluid phase is increased. Our findings
+are helpful for the experimental search for the topological superfluid phase in
+ultra-cold Fermi gases, and have interesting implications for
+quasi-low-dimensional polarized Fermi gases in general.",1209.5935v2
+2013-03-19,Anisotropic magnetoresistance in antiferromagnetic semiconductor Sr2IrO4 epitaxial heterostructure,"Lord Kelvin with his discovery of the anisotropic magnetoresistance (AMR)
+phenomenon in Ni and Fe was 70 years ahead of the formulation of relativistic
+quantum mechanics the effect stems from, and almost one and a half century
+ahead of spintronics whose first commercial applications relied on the AMR.
+Despite the long history and importance in magnetic sensing and memory
+technologies, the microscopic understanding of the AMR has struggled to go far
+beyond the basic notion of a relativistic magnetotransport phenomenon arising
+from combined effects on diffusing carriers of spin-orbit coupling and broken
+symmetry of a metallic ferromagnet. Our work demonstrates that even this
+seemingly generic notion of the AMR phenomenon needs revisiting as we observe
+the ohmic AMR effect in a nano-scale film of an antiferromagnetic (AFM)
+semiconductor Sr2IrO4 (SIO). Our work opens the recently proposed path for
+integrating semiconducting and spintronic technologies in AFMs. SIO is a
+particularly favorable material for exploring this path since its
+semiconducting nature is entangled with the AFM order and strong spin-orbit
+coupling. For the observation of the low-field Ohmic AMR in SIO we prepared an
+epitaxial heterostructure comprising a nano-scale SIO film on top of an
+epilayer of a FM metal La2/3Sr1/3MnO3 (LSMO). This allows the magnetic field
+control of the orientation of AFM spins in SIO via the exchange spring effect
+at the FM-AFM interface.",1303.4704v1
+2013-03-24,Various probes of Dirac matter: from graphene to topological insulators,"Graphene, the atomic-thin layer of carbon atoms, was first isolated on an
+insulating substrate in 2004 by two groups in Manchester University [1, 2] and
+Columbia [3]. Those milestone experiments established the Dirac nature of the
+charge carriers in graphene. The same year, C.L. Kane and E.G. Mele predicted
+that intrinsic spin-orbit coupling in graphene, if strong enough, would lead to
+a novel state of electronic matter called the Quantum Spin Hall (QSH) state [4,
+5]. The QSH state is characterized by conducting gapless edge states
+circulating around an insulating bulk. Those edge states are protected from
+moderate disorder and interactions by a new topological invariant of the Z_2
+nature. While the strength of spin-orbit coupling is too weak in graphene, it
+was soon predicted [6] and verified by transport experiments [7, 8] that the
+QSH state is realized in HgTe/CdTe quantum wells. In this manuscript, I will
+summarize some selected aspects of this huge field of research focused on Dirac
+matter including graphene and topological insulators. By Dirac matter, we have
+in mind various systems whose excitations obey a relativistic Dirac-like
+equation instead of the non relativistic Schrodinger equation. This report is
+mainly focused on the 2D topological insulators using graphene as a guideline.
+In chapter 1, the semimetallic character of graphene is derived and the
+symmetry protection of the Dirac points is discussed while chapters 2 and 3 are
+devoted to Chern insulators and QSH insulators respectively.",1303.5902v1
+2014-02-25,Quasiuniversal properties of neutron star mergers,"Binary neutron star mergers are studied using nonlinear 3+1 numerical
+relativity simulations and the analytical effective-one-body (EOB) model. The
+EOB model predicts quasiuniversal relations between the mass-rescaled
+gravitational wave frequency and the binding energy at the moment of merger,
+and certain dimensionless binary tidal coupling constants depending on the
+stars Love numbers, compactnesses and the binary mass ratio. These relations
+are quasiuniversal in the sense that, for a given value of the tidal coupling
+constant, they depend significantly neither on the equation of state nor on the
+mass ratio, though they do depend on stars spins. The spin dependence is
+approximately linear for small spins aligned with the orbital angular momentum.
+The quasiuniversality is a property of the conservative dynamics; nontrivial
+relations emerge as the binary interaction becomes tidally dominated. This
+analytical prediction is qualitatively consistent with new, multi-orbit
+numerical relativity results for the relevant case of equal-mass irrotational
+binaries. Universal relations are thus expected to characterize neutron star
+mergers dynamics. In the context of gravitational wave astronomy, these
+universal relations may be used to constrain the neutron star equation of state
+using waveforms that model the merger accurately.",1402.6244v2
+2014-08-28,Effect of Zn doping on the Magneto-Caloric effect and Critical Constants of Mott Insulator MnV2O4,"X-ray absorption near edge spectra (XANES) and magnetization of Zn doped
+MnV2O4 have been measured and from the magnetic measurement the critical
+exponents and magnetocaloric effect have been estimated. The XANES study
+indicates that Zn doping does not change the valence states in Mn and V. It has
+been shown that the obtained values of critical exponents \b{eta}, {\gamma} and
+{\delta} do not belong to universal class and the values are in between the 3D
+Heisenberg model and the mean field interaction model. The magnetization data
+follow the scaling equation and collapse into two branches indicating that the
+calculated critical exponents and critical temperature are unambiguous and
+intrinsic to the system. All the samples show large magneto-caloric effect. The
+second peak in magneto-caloric curve of Mn0.95Zn0.05V2O4 is due to the strong
+coupling between orbital and spin degrees of freedom. But 10% Zn doping reduces
+the residual spins on the V-V pairs resulting the decrease of coupling between
+orbital and spin degrees of freedom.",1408.6679v1
+2014-10-07,Real-time dynamics induced by quenches across the quantum critical points in gapless Fermi systems with a magnetic impurity,"The energy-dependent scattering of fermions from a localized orbital at an
+energy-dependent rate $\Gamma(\epsilon)\propto |\epsilon|^r$ gives rise to
+quantum critical points (QCPs) in the pseudogap single-impurity Anderson model
+separating a local moment phase with an unscreened spin moment from a
+strong-coupling phase which slightly deviates from the screened phase of
+standard Kondo problem. Using the time-dependent numerical renormalization
+group (TD-NRG) approach we show that local dynamic properties always
+equilibrate towards a steady-state value even for quenches across the QCP but
+with systematic deviations from the thermal equilibrium depending on the
+distance to the critical coupling. Local non-equilibrium properties are
+presented for interaction quenches and hybridization quenches. We augment our
+numerical data by an analytical calculation that becomes exact at short times
+and find excellent agreement between the numerics and the analytical theory.
+For interaction quenches within the screened phase we find a universal function
+for the time-dependent local double occupancy. We trace back the discrepancy
+between our results and the data obtained by a time-dependent Gutzwiller
+variational approach to restrictions of the wave-function ansatz in the
+Gutzwiller theory: while the NRG ground states properly account for the
+formation of an extended spin moment which decouples from the system in the
+unscreened phase, the Gutzwiller ansatz only allows the formation of the spin
+moment on the local impurity orbital.",1410.1770v2
+2014-10-22,SNS junctions in nanowires with spin-orbit coupling: role of confinement and helicity on the sub-gap spectrum,"We study normal transport and the sub-gap spectrum of
+superconductor-normal-superconductor (SNS) junctions made of semiconducting
+nanowires with strong Rashba spin-orbit coupling. We focus, in particular, on
+the role of confinement effects in long ballistic junctions. In the normal
+regime, scattering at the two contacts gives rise to two distinct features in
+conductance, Fabry-Perot resonances and Fano dips. The latter arise in the
+presence of a strong Zeeman field $B$ that removes a spin sector in the leads
+(\emph{helical} leads), but not in the central region. Conversely, a helical
+central region between non-helical leads exhibits helical gaps of half-quantum
+conductance, with superimposed helical Fabry-Perot oscillations. These normal
+features translate into distinct subgap states when the leads become
+superconducting. In particular, Fabry-Perot resonances within the helical gap
+become parity-protected zero-energy states (parity crossings), well below the
+critical field $B_c$ at which the superconducting leads become topological. As
+a function of Zeeman field or Fermi energy, these zero-modes oscillate around
+zero energy, forming characteristic loops, which evolve continuously into
+Majorana bound states as $B$ exceeds $B_c$. The relation with the physics of
+parity crossings of Yu-Shiba-Rusinov bound states is discussed.",1410.6074v2
+2015-09-18,Multiple Unpinned Dirac Points in Group-Va Single-layers with Phosphorene Structure,"Emergent Dirac fermion states underlie many intriguing properties of
+graphene, and the search for them constitute one strong motivation to explore
+two-dimensional (2D) allotropes of other elements. Phosphorene, the ultrathin
+layers of black phosphorous, has been a subject of intense investigations
+recently, and it was found that other group-Va elements could also form 2D
+layers with similar puckered lattice structure. Here, by a close examination of
+their electronic band structure evolution, we discover two types of Dirac
+fermion states emerging in the low-energy spectrum. One pair of (type-I) Dirac
+points is sitting on high-symmetry lines, while two pairs of (type-II) Dirac
+points are located at generic $k$-points, with different anisotropic
+dispersions determined by the reduced symmetries at their locations. Such
+fully-unpinned (type-II) 2D Dirac points are discovered for the first time. In
+the absence of spin-orbit coupling, we find that each Dirac node is protected
+by the sublattice symmetry from gap opening, which is in turn ensured by any
+one of three point group symmetries. The spin-orbit coupling generally gaps the
+Dirac nodes, and for the type-I case, this drives the system into a quantum
+spin Hall insulator phase. We suggest possible ways to realize the unpinned
+Dirac points in strained phosphorene.",1509.05629v2
+2016-06-10,"Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6","The influence of spin-orbit coupling (SOC) on the physical properties of the
+5d2 system Sr2MgOsO6 is probed via a combination of magnetometry, specific heat
+measurements, elastic and inelastic neutron scattering, and density functional
+theory calculations. Although a significant degree of frustration is expected,
+we find that Sr2MgOsO6 orders in a type I antiferromagnetic structure at the
+remarkably high temperature of 108 K. The measurements presented allow for the
+first accurate quantification of the size of the magnetic moment in a 5d2
+system of 0.60(2) muB - a significantly reduced moment from the expected value
+for such a system. Furthermore, significant anisotropy is identified via a spin
+excitation gap, and we confirm by first principles calculations that SOC not
+only provides the magnetocrystalline anisotropy, but also plays a crucial role
+in determining both the ground state magnetic order and the size of the local
+moment in this compound. Through comparison to Sr2ScOsO6, it is demonstrated
+that SOC-induced anisotropy has the ability to relieve frustration in 5d2
+systems relative to their 5d3 counterparts, providing an explanation of the
+high TN found in Sr2MgOsO6.",1606.03231v1
+2016-06-14,Spin-orbit coupling effects on the stability of two competing structures in Pb/Si(111) and Pb/Ge(111),"Using first-principles density-functional theory (DFT) calculations, we
+investigate the 4/3-monolayer structure of Pb on the Si(111) or Ge(111) surface
+within the two competing structural models termed the H$_3$ and T$_4$
+structures. We find that the spin-orbit coupling (SOC) influences the relative
+stability of the two structures in both the Pb/Si(111) and Pb/Ge(111) systems:
+i.e., our DFT calculation without including the SOC predicts that the T$_4$
+structure is energetically favored over the H$_3$ structure by ${\Delta}E$ = 25
+meV for Pb/Si(111) and 22 meV for Pb/Ge(111), but the inclusion of SOC reverses
+their relative stability as ${\Delta}E$ = $-$12 and $-$7 meV, respectively. Our
+analysis shows that the SOC-induced switching of the ground state is attributed
+to a more asymmetric surface charge distribution in the H$_3$ structure, which
+gives rise to a relatively larger Rashba spin splitting of surface states as
+well as a relatively larger pseudo-gap opening compared to the T$_4$ structure.
+By the nudged elastic band calculation, we obtain a sizable energy barrier from
+the H$_3$ to the T$_4$ structure as ${\sim}$0.59 and ${\sim}$0.27 eV for
+Pb/Si(111) and Pb/Ge(111), respectively. It is thus likely that the two
+energetically competing structures can coexist at low temperatures.",1606.04208v1
+2018-04-10,Asymmetric and symmetric exchange in a generalized 2D Rashba ferromagnet,"Dzyaloshinskii-Moriya interaction (DMI) is investigated in a 2D ferromagnet
+(FM) with spin-orbit interaction of Rashba type at finite temperatures. The FM
+is described in the continuum limit by an effective $s$-$d$ model with
+arbitrary dependence of spin-orbit coupling (SOC) and kinetic energy of
+itinerant electrons on the absolute value of momentum. In the limit of weak
+SOC, we derive a general expression for the DMI constant $D$ from a microscopic
+analysis of the electronic grand potential. We compare $D$ with the exchange
+stiffness $A$ and show that, to the leading order in small SOC strength
+$\alpha_{\text{R}}$, the conventional relation $D=(4
+m\alpha_{\text{R}}/\hbar)A$, in general, does not hold beyond the
+Bychkov-Rashba model. Moreover, in this model, both $A$ and $D$ vanish at zero
+temperature in the metal regime (i.e., when two spin sub-bands are partly
+occupied). For nonparabolic bands or nonlinear Rashba coupling, these
+coefficients are finite and acquire a nontrivial dependence on the chemical
+potential that demonstrates the possibility to control the size and chirality
+of magnetic textures by adjusting a gate voltage.",1804.03739v3
+2017-01-04,Controlling plasmon modes and damping in buckled two-dimensional material open systems,"Full ranges of both hybrid plasmon-mode dispersions and their damping are
+studied systematically by our recently developed mean-field theory in open
+systems involving a conducting substrate and a two-dimensional (2D) material
+with a buckled honeycomb lattice, such as silicene, germanene, and a group
+\rom{4} dichalcogenide as well. In this hybrid system, the single plasmon mode
+for a free-standing 2D layer is split into one acoustic-like and one
+optical-like mode, leading to a dramatic change in the damping of plasmon
+modes. In comparison with gapped graphene, critical features associated with
+plasmon modes and damping in silicene and molybdenum disulfide are found with
+various spin-orbit and lattice asymmetry energy bandgaps, doping types and
+levels, and coupling strengths between 2D materials and the conducting
+substrate. The obtained damping dependence on both spin and valley degrees of
+freedom is expected to facilitate measuring the open-system dielectric property
+and the spin-orbit coupling strength of individual 2D materials. The unique
+linear dispersion of the acoustic-like plasmon mode introduces additional
+damping from the intraband particle-hole modes which is absent for a
+free-standing 2D material layer, and the use of molybdenum disulfide with a
+large bandgap simultaneously suppresses the strong damping from the interband
+particle-hole modes.",1701.01084v1
+2018-05-04,Selective measurements of intertwined multipolar orders: non-Kramers doublets on a triangular lattice,"Motivated by the rapid experimental progress on the spin-orbit-coupled Mott
+insulators, we propose and study a generic spin model that describes the
+interaction between the non-Kramers doublets on a triangular lattice and is
+relevant for triangular lattice rare-earth magnets. We predict that the system
+supports both pure quadrupolar orders and intertwined multipolar orders in the
+phase diagram. Besides the multipolar orders, we explore the magnetic
+excitations to reveal the dynamic properties of the systems. Due to the
+peculiar properties of the non-Kramers doublets and the selective coupling to
+the magnetic field, we further study the magnetization process of the system in
+the magnetic field. We point out the selective measurements of the static and
+dynamic properties of the intertwined multipolarness in the neutron scattering,
+NMR and $\mu$SR probes and predict the experimental consequences. The relevance
+to the existing materials such as TmMgGaO$_{4}$, Pr-based and Tb-based magnets,
+and many ternary chalcogenides is discussed. Our results illustrate the rich
+physics and the promising direction in the interplay between strong
+spin-orbit-entangled multipole moments and the geometrical frustration.",1805.01865v3
+2018-05-31,Creating solitons by means of spin-orbit coupling,"This mini-review collects theoretical results predicting the creation of
+matter-wave solitons by the pseudo-spinor system of Gross-Pitaevskii equations
+(GPEs) with the self-attractive cubic nonlinearity and linear
+first-order-derivative terms accounting for the spin-orbit coupling (SOC). In
+one dimension (1D), the so predicted bright solitons are similar to their
+well-known counterparts supported by the GPE in the absence of SOC. Completely
+novel results were recently obtained for 2D and 3D systems: SOC suppresses the
+collapse instability of the multidimensional GPE, creating fully stable 2D
+ground-state solitons and metastable 3D ones of two types: semi-vortices (SVs),
+with vorticities m = 1 in one spin component and m = 0 in the other, and mixed
+modes (MMs), with m = 0 and m = (+/-)1 present in both components. With the
+Galilean invariance broken by SOC, moving solitons exist up to a certain
+critical velocity, suffering delocalization above it. The newest result
+predicts stable 2D ""quantum droplets"" of the MM type in the presence of the
+Lee-Huang-Yang corrections to the GPE system, induced by quantum fluctuations
+around the mean-field states, in the case when the inter-component attraction
+dominates over the self-repulsion in each component.",1805.12359v1
+2019-09-03,"Intrinsic topological superconductivity with exactly flat surface bands in the quasi-one-dimensional A$_2$Cr$_3$As$_3$ (A=Na, K, Rb, Cs) superconductors","A spin-U(1)-symmetry protected momentum-dependent integer-$Z$-valued
+topological invariant is proposed to time-reversal-invariant (TRI)
+superconductivity (SC) whose nonzero value will lead to exactly flat surface
+band(s). The theory is applied to the weakly spin-orbit coupled quasi-1D
+A$_2$Cr$_3$As$_3$ (A=Na, K, Rb, Cs) superconductors family with highest $T_c$
+up to 8.6 K with $p_z$-wave pairing in the $S_z=0$ channel. It's found that up
+to the leading atomic spin-orbit-coupling (SOC), the whole (001) surface
+Brillouin zone is covered with exactly-flat surface bands, with some regime
+hosting three flat bands and the remaining part hosting two. Such exactly-flat
+surface bands will lead to very sharp zero-bias conductance peak in the
+scanning tunneling microscopic spectrum. When a tiny subleading spin-flipping
+SOC is considered, the surface bands will only be slightly split. The
+application of this theory can be generalized to other unconventional
+superconductors with weak SOC, particularly to those with mirror-reflection
+symmetry.",1909.00943v3
+2019-09-06,Octupolar order in d-orbital Mott insulators,"Motivated by experimental and theoretical interest in realizing multipolar
+orders in $d$-orbital materials, we discuss the quantum magnetism of $J\!=\!2$
+ions which can be realized in spin-orbit coupled oxides with $5d^2$ transition
+metal ions. Based on the crystal field environment, we argue for a splitting of
+the $J\!=\!2$ multiplet, leading to a low lying non-Kramers doublet which hosts
+quadrupolar and octupolar moments. We discuss a microscopic mechanism whereby
+the combined perturbative effects of orbital repulsion and antiferromagnetic
+Heisenberg spin interactions leads to ferro-octupolar coupling between
+neighboring sites, and stabilizes ferro-octupolar order for a face-centered
+cubic lattice. This same mechanism is also shown to disfavor quadrupolar
+ordering. We show that studying crystal field levels via Raman scattering in a
+magnetic field provides a probe of octupolar order. We study spin dynamics in
+the ferro-octupolar state using a slave-boson approach, uncovering a gapped and
+dispersive magnetic exciton. For sufficiently strong magnetic exchange, the
+dispersive exciton can condense, leading to conventional type-I
+antiferromagnetic (AFM) order which can preempt octupolar order. Our proposal
+for ferrooctupolar order, with specific results in the context of a model
+Hamiltonian, provides a comprehensive understanding of thermodynamics, $\mu$SR,
+X-ray diffraction, and inelastic neutron scattering measurements on a range of
+cubic $5d^2$ double perovskite materials including Ba$_2$ZnOsO$_6$,
+Ba$_2$CaOsO$_6$, and Ba$_2$MgOsO$_6$. Our proposal for exciton condensation
+leading to type-I AFM order may be relevant to materials such as
+Sr$_2$MgOsO$_6$.",1909.03089v3
+2019-09-24,Quantum Hall Effect Measurement of Spin-Orbit Coupling Strengths in Ultraclean Bilayer Graphene/WSe2 Heterostructures,"We study proximity-induced spin-orbit coupling (SOC) in bilayer
+graphene/few-layer WSe2 heterostructure devices. Contact mode atomic force
+microscopy (AFM) cleaning yields ultra-clean interfaces and high-mobility
+devices. In a perpendicular magnetic field, we measure the quantum Hall effect
+to determine the Landau level structure in the presence of out-of-plane Ising
+and in-plane Rashba SOC. A distinct Landau level crossing pattern emerges when
+tuning the charge density and displacement field independently with dual gates,
+originating from a layer-selective SOC proximity effect. Analyzing the Landau
+level crossings and measured inter-Landau level energy gaps yields the
+proximity induced SOC energy scale. The Ising SOC is ~ 2.2 meV, 100 times
+higher than the intrinsic SOC in graphene, while its sign is consistent with
+theories predicting a dependence of SOC on interlayer twist angle. The Rashba
+SOC is ~15 meV. Finally, we infer the magnetic field dependence of the
+inter-Landau level Coulomb interactions. These ultraclean bilayer graphene/WSe2
+heterostructures provide a high mobility system with the potential to realize
+novel topological electronic states and manipulate spins in nanostructures.",1909.10931v1
+2019-10-24,DFT study of itinerant ferromagnetism in $p$-doped monolayers of MoS$_2$,"We use density functional theory to explore the possibility of making the
+semiconducting transition-metal dichalcogenide MoS$_2$ ferromagnetic by
+introducing holes into the narrow Mo $d$ band that forms the top of the valence
+band. In the single impurity limit, the repulsive Coulomb potential of an
+acceptor atom and intervalley scattering lead to a twofold orbitally degenerate
+effective-mass like $e'$ state being formed from Mo $d_{x^2-y^2}$ and $d_{xy}$
+states, bound to the K and K$'$ valence band maxima. It also leads to a singly
+degenerate $a'_1$ state with Mo $d_{3z^2-r^2}$ character bound to the slightly
+lower lying valence band maximum at $\Gamma$. Within the accuracy of our
+calculations, these $e'$ and $a'_1$ states are degenerate for MoS$_2$ and
+accommodate the hole that polarizes fully in the local spin density
+approximation in the impurity limit. With spin-orbit coupling included, we find
+a single ion magnetic anisotropy of $\sim 5\,$meV favouring out-of-plane
+orientation of the magnetic moment. Pairs of such hole states introduced by V,
+Nb or Ta doping are found to couple ferromagnetically unless the dopant atoms
+are too close in which case the magnetic moments are quenched by the formation
+of spin singlets. Combining these exchange interactions with Monte Carlo
+calculations allows us to estimate ordering temperatures as a function of the
+dopant concentration $x$. For $x \sim 9\%$, Curie temperatures as high as 100K
+for Nb and Ta and in excess of 160K for V doping are predicted. Factors
+limiting the ordering temperature are identified and suggestions made to
+circumvent these limitations.",1910.10992v1
+2020-01-30,Self-controlled growth of highly uniform Ge/Si hut wires for scalable qubit devices,"Semiconductor nanowires have been playing a crucial role in the development
+of nanoscale devices for the realization of spin qubits, Majorana fermions,
+single photon emitters, nanoprocessors, etc. The monolithic growth of
+site-controlled nanowires is a prerequisite towards the next generation of
+devices that will require addressability and scalability. Here, combining
+top-down nanofabrication and bottom-up self-assembly, we report on the growth
+of Ge wires on pre-patterned Si (001) substrates with controllable position,
+distance, length and structure. This is achieved by a novel growth process
+which uses a SiGe strain-relaxation template and can be generalized to other
+material combinations. Transport measurements show an electrically tunable
+spin-orbit coupling, with a spin-orbit length similar to that of III-V
+materials. Also, capacitive coupling between closely spaced wires is observed,
+which underlines their potential as a host for implementing two qubit gates.
+The reported results open a path towards scalable qubit devices with Si
+compatibility.",2001.11305v2
+2020-04-09,Anomalous Hall effect in $κ$-type organic antiferromagnets,"We theoretically propose a mechanism for the anomalous Hall effect (AHE) in
+an antiferrromagnetic (AFM) state of $\kappa$-type organic conductors. We
+incorporate the spin-orbit coupling in the effective Hubbard model on the
+$\kappa$-type lattice structure taking into account the orientation of the
+molecules and their arrangement with dimerization. Treating this model by means
+of the Hartree-Fock approximation and the linear response theory, we find that
+an intrinsic contribution to the Hall conductivity becomes nonzero in the
+electron-doped AFM metallic phase with a small canted ferromagnetic moment. We
+show that, contrary to the conventional wisdom, the spin canting is irrelevant
+to the Hall response; the nonzero Hall conductivity originates from the
+collinear component of the AFM order in the presence of the spin-orbit
+coupling. These features are well explained analytically in the limit of strong
+dimerization on the anisotropic triangular lattice. Furthermore, we present an
+intuitive picture for the present AHE by considering the real-space
+configuration of emergent magnetic fluxes. We also find that the Hall response
+appears even in the undoped AFM insulating phase at nonzero frequency as the
+magneto-optical Kerr effect, which is enhanced around the charge transfer
+excitations. We discuss possible detections of the AHE in ET based compounds.",2004.04578v1
+2018-03-23,Observation of hedgehog skyrmions in sub-100 nm soft magnetic nanodots,"Magnetic skyrmions are nanometric spin textures of outstanding potential for
+spintronic applications due to unique features governed by their non-trivial
+topology. It is well known that skyrmions of definite chirality are stabilized
+by the Dzyaloshinskii-Moriya exchange interaction (DMI) in bulk
+non-centrosimmetric materials or ultrathin films with strong spin-orbit
+coupling in the interface. In this work, we report on the detection of magnetic
+hedgehog-skyrmions at room temperature in confined systems with neither DMI nor
+perpendicular magnetic anisotropy. We show that soft magnetic (permalloy)
+nanodots are able to host non- chiral hedgehog skyrmions that can be further
+stabilized by the magnetic field arising from the Magnetic Force Microscopy
+probe. Analytical calculations and micromagnetic simulations confirmed the
+existence of metastable N\'eel skyrmions in permalloy nanodots even without
+external stimuli in a certain size range. Our work implies the existence of a
+new degree of freedom to create and manipulate skyrmions in soft nanodots. The
+stabilization of skyrmions in soft magnetic materials opens a possibility to
+study the skymion magnetization dynamics otherwise limited due to the large
+damping constant coming from the high spin-orbit coupling in materials with
+high magnetic anisotropy.",1803.08768v1
+2019-04-09,Thermoelectric and optical probes for a Fermi surface topology change in noncentrosymmetric metals,"Noncentrosymmetric metals such as Li$_2$(Pd$_{1-x}$Pt$_x$)$_3$B have
+different Fermi surface topology below and above the band touching point where
+spin-degeneracy is not lifted by the spin-orbit coupling. We investigate
+thermoelectric and optical response as probes for this Fermi surface topology
+change. We show that the chemical potential displays a dimensional crossover
+from a three-dimensional to one-dimensional characteristics as the descending
+Fermi energy crosses the band touching point. This dimensional crossover is due
+to the existence of different Fermi surface topology above and below the band
+touching point. We obtain an exact expression of relaxation time due to
+short-range scatterer by solving Boltzmann transport equations
+self-consistently. The thermoelctric power and figure of merit are
+significantly enhanced as the Fermi energy goes below the band touching point
+owing to the underlying one-dimensional-like nature of noncentrosymmteric bulk
+metals. The value of thermoelectric figure of merit goes beyond two as the
+Fermi energy approaches to the van Hove singularity for lower spin-orbit
+coupling. Similarly, the studies of the zero-frequency and finite-frequency
+optical conductivities in the zero-momentum limit reflect the nature of
+topological change of the Fermi surface. The Hall coefficient and optical
+absorption width exhibit distinct signatures in response to the changes in
+Fermi surface topology.",1904.04656v2
+2019-12-05,Steering magnonic dynamics and permeability at exceptional points in a parity-time symmetric waveguide,"Tuning the low-energy magnetic dynamics is a key element in designing novel
+magnetic metamaterials, spintronic devices and magnonic logic circuits. This
+study uncovers a new, highly effective way of controlling the magnetic
+permeability via shaping the magnonic properties in coupled magnetic waveguides
+separated by current carrying spacer with strong spin-orbit coupling. The
+spin-orbit torques exerted on the waveguides leads to an externally tunable
+enhancement of magnetic damping in one waveguide and a decreased damping in the
+other, constituting so a magnetic parity-time (PT) symmetric system with
+emergent magnetic properties at the verge of the exceptional point where
+magnetic gains/losses are balanced. In addition to controlling the magnetic
+permeability, phenomena inherent to PT-symmetric systems are identified,
+including the control on magnon power oscillations, nonreciprocal magnon
+propagation, magnon trapping and enhancement as well as the increased
+sensitivity to magnetic perturbation and abrupt spin reversal. These
+predictions are demonstrated analytically and confirmed by full numerical
+simulations under experimentally feasible conditions. The position of the
+exceptional points and the strength of the spontaneous PT symmetry breaking can
+be tuned by external electric and/or magnetic fields. The roles of the
+intrinsic magnetic damping, and the possibility of an electric control via
+Dzyaloshinskii-Moriya interaction are exposed and utilized for mode dispersion
+shaping and magnon amplification and trapping. The results point to a new route
+to designing optomagnonic waveguides, traps, sensors, and circuits.",1912.02500v1
+2020-08-14,Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene,"Van der Waals heterostructures provide a rich platform for emergent physics
+due to their tunable hybridization of electronic orbital- and spin-degrees of
+freedom. Here, we show that a heterostructure formed by twisted bilayer
+graphene sandwiched between ferromagnetic insulators develops flat bands
+stemming from the interplay between twist, exchange proximity and spin-orbit
+coupling. We demonstrate that in this flat-band regime, the spin degree of
+freedom is hybridized, giving rise to an effective triangular superlattice with
+valley as a degenerate pseudospin degree of freedom. Incorporating electronic
+interactions at half-filling leads to a spontaneous valley-mixed state, i.e., a
+correlated state in the valley sector with geometric frustration of the valley
+spinor. We show that an electric interlayer bias generates an artificial
+valley-orbit coupling in the effective model, controlling both the valley
+anisotropy and the microscopic details of the correlated state, with both
+phenomena understood in terms of a valley-Heisenberg model with easy-plane
+anisotropic exchange. Our results put forward twisted graphene encapsulated
+between magnetic van der Waals heterostructures as platforms to explore purely
+valley-correlated states in graphene.",2008.06441v1
+2020-10-19,Novel $J_{\rm{eff}}$=3/2 Metallic Phase and Unconventional Superconductivity in GaTa$_4$Se$_8$,"By means of density functional theory plus dynamical mean-field theory
+(DFT+DMFT) calculations and resonant inelastic x-ray scattering (RIXS)
+experiments, we investigate the high-pressure phases of the spin-orbit-coupled
+$J_{\rm{eff}}=3/2$ insulator GaTa$_4$Se$_8$. Its metallic phase, derived from
+the Mott state by applying pressure, is found to carry $J_{\rm{eff}}=3/2$
+moments. The characteristic excitation peak in the RIXS spectrum maintains its
+destructive quantum interference of $J_{\rm{eff}}$ at the Ta $L_2$-edge up to
+10.4 GPa. Our exact diagonalization based DFT+DMFT calculations including
+spin-orbit coupling also reveal that the $J_{\rm{eff}}=3/2$ character can be
+clearly identified under high pressure. These results establish the intriguing
+nature of the correlated metallic magnetic phase, which represents the first
+confirmed example of $J_{\rm{eff}}$=3/2 moments residing in a metal. They also
+indicate that the pressure-induced superconductivity is likely unconventional
+and influenced by these $J_{\rm{eff}}=3/2$ moments. Based on a self-energy
+analysis, we furthermore propose the possibility of doping-induced
+superconductivity related to a spin-freezing crossover.",2010.09234v1
+2017-07-08,RKKY interaction in three-dimensional electron gases with linear spin-orbit coupling,"We theoretically study the impacts of linear spin-orbit coupling (SOC) on the
+Ruderman-Kittel-Kasuya-Yosida interaction between magnetic impurities in two
+kinds of three-dimensional noncentrosymmetric systems. It has been found that
+linear SOCs lead to the Dzyaloshinskii-Moriya interaction and the Ising
+interaction, in addition to the conventional Heisenberg interaction. These
+interactions possess distinct range functions from three dimensional electron
+gases and Dirac/Weyl semimetals. In the weak SOC limit, the Heisenberg
+interaction dominates over the other two interactions in a moderately large
+region of parameters. Sufficiently strong Rashba SOC makes the
+Dzyaloshinskii-Moriya interaction or the Ising interaction dominate over the
+Heisenberg interaction in some regions. The change in topology of the Fermi
+surface leads to some quantitative changes in periods of oscillations of range
+functions. The anisotropy of Ruderman-Kittel-Kasuya-Yosida interaction in
+bismuth tellurohalides family BiTe$X$ ($X$ = Br, Cl, and I) originates from
+both the specific form of Rashba SOC and the anisotropic effective mass. Our
+work provides some insights into understanding observed spin textures and the
+application of these materials in spintronics.",1707.02381v3
+2018-10-19,Dynamic tomography of the spin-orbit coupling in nonlinear optics,"Spin-orbit coupled (SOC) light fields with spatially inhomogeneous
+polarization have attracted increasing research interest within the optical
+community. In particular, owing to their spin-dependent phase and spatial
+structures, many nonlinear optical phenomena which we have been familiar with
+up to now are being re-examined, hence a revival of research in nonlinear
+optics. To fully investigate this topic, knowledge on how the topological
+structure of the light field evolves is necessary, but, as yet, there are few
+studies that address the structural evolution of the light field. Here, for the
+first time, we present a universal approach for theoretical tomographic
+treatment of the structural evolution of SOC light in nonlinear optics
+processes. Based on a Gedanken vector second harmonic generation, a
+fine-grained slice of evolving SOC light in a nonlinear interaction and the
+following diffraction propagation are studied theoretically and verified
+experimentally, and which at the same time reveal several interesting
+phenomena. The approach provides a useful tool for enhancing our capability to
+obtain a more nuanced understanding of vector nonlinear optics, and sets a
+foundation for further broad-based studies in nonlinear systems.",1810.08358v2
+2018-10-30,Charged fermion in $(1+2)$-dimensional wormhole with axial magnetic field,"We investigate the effects of magnetic field on a charged fermion in a
+$(1+2)$-dimensional wormhole. Applying external magnetic field along the axis
+direction of the wormhole, the Dirac equation is set up and analytically solved
+in two scenarios, constant magnetic flux and constant magnetic field through
+the throat of the wormhole. For the constant magnetic flux scenario, the system
+can be solved analytically and exact solutions are found. For the constant
+magnetic field scenario, with the short wormhole approximation, the quantized
+energies and eigenstates are obtained. The system exhibits both the spin-orbit
+coupling and the Landau quantization for the stationary states in both
+scenarios. The intrinsic curvature of the surface induces the spin-orbit and
+spin-magnetic Landau couplings that generate imaginary energy. Imaginary energy
+can be interpreted as the energy dissipation and instability of the states.
+Generically, the states of charged fermion in wormhole are quasinormal
+modes~(QNMs) that could be unstable for positive imaginary frequencies and
+decaying for negative imaginary ones. For the constant flux scenario, the
+fermions in the wormhole can behave like bosons and have arbitrary statistics
+depending on the flux. We also discuss the implications of our results in the
+graphene wormhole system.",1810.12668v2
+2019-05-26,Two-body bound state of ultracold Fermi atoms with two-dimensional spin-orbit coupling,"In a recent experiment, a two-dimensional spin-orbit coupling (SOC) was
+realized for fermions in the continuum [Nat. Phys. 12, 540 (2016)], which
+represents an important step forward in the study of synthetic gauge field
+using cold atoms. In the experiment, it was shown that a Raman-induced
+two-dimensional SOC exists in the dressed-state basis close to a Dirac point of
+the single-particle spectrum. By contrast, the short-range inter-atomic
+interactions of the system are typically expressed in the hyperfine-spin basis.
+The interplay between synthetic SOC and interactions can potentially lead to
+interesting few- and many-body phenomena but has so far eluded theoretical
+attention. Here we study in detail properties of two-body bound states of such
+a system. We find that, due to the competition between SOC and interaction, the
+stability region of the two-body bound state is in general reduced.
+Particularly, the threshold of the lowest two-body bound state is shifted to a
+positive, SOC-dependent scattering length. Furthermore, the center-of-mass
+momentum of the lowest two-body bound state becomes nonzero, suggesting the
+emergence of Fulde-Ferrell pairing states in a many-body setting. Our results
+reveal the critical difference between the experimentally realized
+two-dimensional SOC and the more symmetric Rashba or Dresselhaus SOCs in an
+interacting system, and paves the way for future characterizations of
+topological superfluid states in the experimentally relevant systems.",1905.10735v1
+2019-06-27,A three-dimensional superconformal quantum mechanics with $sl(2|1)$ dynamical symmetry,"We construct a three-dimensional superconformal quantum mechanics (and its
+associated de Alfaro-Fubini-Furlan deformed oscillator) possessing an $sl(2|1)$
+dynamical symmetry. At a coupling parameter $\beta\neq 0$ the Hamiltonian
+contains a $\frac{1}{r^2}$ potential and a spin-orbit (hence, a first-order
+differential operator) interacting term. At $\beta=0$ four copies of undeformed
+three-dimensional oscillators are recovered. The Hamiltonian gets diagonalized
+in each sector of total $j$ and orbital $l$ angular momentum (the spin of the
+system is $\frac{1}{2}$). The Hilbert space of the deformed oscillator is given
+by a direct sum of $sl(2|1)$ lowest weight representations. The selection of
+the admissible Hilbert spaces at given values of the coupling constant $\beta$
+is discussed. The spectrum of the model is computed. The vacuum energy (as a
+function of $\beta$) consists of a recursive zigzag pattern. The degeneracy of
+the energy eigenvalues grows linearly up to $E\sim \beta$ (in proper units) and
+quadratically for $E>\beta$. The orthonormal energy eigenstates are expressed
+in terms of the associated Laguerre polynomials and the spin spherical
+harmonics. The dimensional reduction of the model to $d=2$ produces two copies
+(for $\beta$ and $-\beta$, respectively) of the two-dimensional $sl(2|1)$
+deformed oscillator. The dimensional reduction to $d=1$ produces the
+one-dimensional $D(2,1;\alpha)$ deformed oscillator, with $\alpha$ determined
+by $\beta$.",1906.11705v2
+2020-06-03,Topological Hall Effect and Skyrmion-like Bubbles at a Charge-transfer Interface,"Exploring exotic interface magnetism due to charge transfer and strong
+spin-orbit coupling has profound application in future development of
+spintronic memory. Here, the emergence, tuning and interpretation of hump-shape
+Hall Effect from a CaMnO3/CaIrO3/CaMnO3 trilayer structure are studied in
+detail. The hump signal can be recognized as Topological Hall Effect suggesting
+the presence of Skyrmion-like magnetic bubbles; but the debated alternative
+interpretation where the signal being an artefact between two cancelling
+Anomalous Hall Effect loops is also discussed. Firstly, by tilting the magnetic
+field direction, the evolution of Hall signal suggests transformation of the
+bubbles topology into a more trivial kind. Secondly, by varying the thickness
+of CaMnO3, the optimal thicknesses for the hump signal emergence are found,
+suggesting a tuning of charge transfer fraction. Using high-resolution
+transmission electron microscopy, a stacking fault is also identified, which
+distinguishes the top and bottom CaMnO3/CaIrO3 interfaces in terms of charge
+transfer fraction and possible interfacial Dzyaloshinskii-Moriya Interaction.
+Finally, a spin-transfer torque experiment revealed a low threshold current
+density of ~10^9 A/m^2 for initiating the motion of bubbles. This discovery
+opens a possible route for integrating Skyrmions with antiferromagnetic
+spintronics.",2006.02004v1
+2021-02-12,Spin-orbit driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene,"Strong electron correlation and spin-orbit coupling (SOC) provide two
+non-trivial threads to condensed matter physics. When these two strands of
+physics come together, a plethora of quantum phenomena with novel topological
+order have been predicted to emerge in the correlated SOC regime. In this work,
+we examine the combined influence of electron correlation and SOC on a
+2-dimensional (2D) electronic system at the atomic interface between
+magic-angle twisted bilayer graphene (tBLG) and a tungsten diselenide (\WSe)
+crystal. In such a structure, strong electron correlation within the moir\'e
+flatband stabilizes correlated insulating states at both quarter and
+half-filling, whereas SOC transforms these Mott-like insulators into
+ferromagnets, evidenced by robust anomalous Hall effect with hysteretic
+switching behavior. The coupling between spin and valley degrees of freedom is
+unambiguously demonstrated as the magnetic order is shown to be tunable with an
+in-plane magnetic field, or a perpendicular electric field. In addition, we
+examine the influence of SOC on the isospin order and stability of
+superconductivity. Our findings establish an efficient experimental knob to
+engineer topological properties of moir\'e bands in twisted bilayer graphene
+and related systems.",2102.06566v2
+2021-08-31,Self-generated quantum gauge fields in arrays of Rydberg atoms,"As shown in recent experiments [V. Lienhard et al., Phys. Rev. X 10, 021031
+(2020)], spin-orbit coupling in systems of Rydberg atoms can give rise to
+density-dependent Peierls Phases in second-order hoppings of Rydberg spin
+excitations and nearest-neighbor (NN) repulsion. We here study theoretically a
+one-dimensional zig-zag ladder system of such spin-orbit coupled Rydberg atoms
+at half filling. The second-order hopping is shown to be associated with an
+effective gauge field, which in mean-field approximation is static and
+homogeneous. Beyond the mean-field level the gauge potential attains a
+transverse quantum component whose amplitude is dynamical and linked to density
+modulations. We here study the effects of this to the possible ground-state
+phases of the system. In a phase where strong repulsion leads to a density
+wave, we find that as a consequence of the induced quantum gauge field a
+regular pattern of current vortices is formed. However also in the absence of
+density-density interactions the quantum gauge field attains a non-vanishing
+amplitude. Above a certain critical strength of the second-order hopping the
+energy gain due to gauge-field induced transport overcomes the energy cost from
+the associated build-up of density modulations leading to a spontaneous
+generation of the quantum gauge field.",2108.13896v1
+2022-02-16,Spectroscopic characterization of singlet-triplet doorway states of aluminum monofluoride,"Aluminum monofluoride (AlF) possesses highly favorable properties for laser
+cooling, both via the A$^1\Pi$ and a$^3\Pi$ states. Determining efficient
+pathways between the singlet and the triplet manifold of electronic states will
+be advantageous for future experiments at ultralow temperatures. The lowest
+rotational levels of the A$^1\Pi, v=6$ and b$^3\Sigma^+, v=5$ states of AlF are
+nearly iso-energetic and interact via spin-orbit coupling. These levels thus
+have a strongly mixed spin-character and provide a singlet-triplet doorway. We
+here present a hyperfine resolved spectroscopic study of the A$^1\Pi, v=6$ //
+b$^3\Sigma^+, v=5$ perturbed system in a jet-cooled, pulsed molecular beam.
+From a fit to the observed energies of the hyperfine levels, the fine and
+hyperfine structure parameters of the coupled states, their relative energies
+as well as the spin-orbit interaction parameter are determined. The standard
+deviation of the fit is about 15 MHz. We experimentally determine the radiative
+lifetimes of selected hyperfine levels by time-delayed ionization, Lamb dip
+spectroscopy and accurate measurements of the transition lineshapes. The
+measured lifetimes range between 2 ns and 200 ns, determined by the degree of
+singlet-triplet mixing for each level.",2202.07920v1
+2022-09-20,Evidence for non-unitary triplet-pairing superconductivity in noncentrosymmetric TaRuSi and comparison with isostructural TaReSi,"We have studied the superconducting properties of the isostructural ternary
+noncentrosymmetric superconductors TaXSi (X = Re, Ru) with the help of muon
+spin rotation/relaxation ($\mu$SR) and density functional theory calculations.
+Our transverse-field $\mu$SR measurements indicate isotropic s-wave
+superconductivity in TaReSi and multi-gap superconductivity in TaRuSi.
+Zero-field $\mu$SR measurements, highly sensitive to very small magnetic
+fields, and no evidence for spontaneous fields in the superconducting state of
+TaReSi, whereas we observe small spontaneous fields that onset with
+superconductivity indicating broken time-reversal symmetry (TRS)
+superconductivity in TaRuSi. Using density functional theory calculations, we
+find that spin-orbit coupling is relatively weak in TaRuSi and strong in
+TaReSi. Using symmetry analysis, we attribute the broken time-reversal symmetry
+(TRS) in TaRuSi to a non-unitary triplet pairing state. Such a state is not
+allowed in the presence of strong spin-orbit coupling: our finding of no
+evidence for broken TRS in TaReSi is consistent with this expectation.",2209.09852v2
+2023-01-04,Coexistence of bulk-nodal and surface-nodeless Cooper pairings in a superconducting Dirac semimetal,"The interplay of nontrivial topology and superconductivity in condensed
+matter physics gives rise to exotic phenomena. However, materials are extremely
+rare where it is possible to explore the full details of the superconducting
+pairing. Here, we investigate the momentum dependence of the superconducting
+gap distribution in a novel Dirac material PdTe. Using high resolution, low
+temperature photoemission spectroscopy, we establish it as a spin-orbit coupled
+Dirac semimetal with the topological Fermi arc crossing the Fermi level on the
+(010) surface. This spin-textured surface state exhibits a fully gapped
+superconducting Cooper pairing structure below Tc~4.5K. Moreover, we find a
+node in the bulk near the Brillouin zone boundary, away from the topological
+Fermi arc.These observations not only demonstrate the band resolved electronic
+correlation between topological Fermi arc states and the way it induces Cooper
+pairing in PdTe, but also provide a rare case where surface and bulk states
+host a coexistence of nodeless and nodal gap structures enforced by spin-orbit
+coupling.",2301.01402v1
+2023-03-15,Ultrafast Opto-magnetic Effects in the Extreme Ultraviolet Spectral Range,"Coherent light-matter interactions mediated by opto-magnetic phenomena like
+the inverse Faraday effect (IFE) are expected to provide a non-thermal pathway
+for ultrafast manipulation of magnetism on timescales as short as the
+excitation pulse itself. As the IFE scales with the spin-orbit coupling
+strength of the involved electronic states, photo-exciting the strongly
+spin-orbit coupled core-level electrons in magnetic materials appears as an
+appealing method to transiently generate large opto-magnetic moments. Here, we
+investigate this scenario in a ferrimagnetic GdFeCo alloy by using intense and
+circularly polarized pulses of extreme ultraviolet radiation. Our results
+reveal ultrafast and strong helicity-dependent magnetic effects which are in
+line with the characteristic fingerprints of an IFE, corroborated by ab initio
+opto-magnetic IFE theory and atomistic spin dynamics simulations.",2303.08564v1
+2023-04-06,Protection of Ising spin-orbit coupling in bulk misfit superconductors,"Low-dimensional materials have remarkable properties that are distinct from
+their bulk counterparts. A paradigmatic example is Ising superconductivity that
+occurs in monolayer materials such as NbSe2 which show a strong violation of
+the Pauli limit. In monolayers, this occurs due to a combination of broken
+inversion symmetry and spin-orbit coupling that locks the spins of the
+electrons out-of-plane. Bulk NbSe2 is centrosymmetric and is therefore not an
+Ising superconductor. We show that bulk misfit compound superconductors,
+(LaSe)1.14(NbSe2) and (LaSe)1.14(NbSe2)2, comprised of monolayers and bilayers
+of NbSe2, exhibit unexpected Ising protection with a Pauli-limit violation
+comparable to monolayer NbSe2, despite formally having inversion symmetry. We
+study these misfit compounds using complementary experimental methods in
+combination with first-principles calculations. We propose theoretical
+mechanisms of how the Ising protection can survive in bulk materials. We show
+how some of these mechanisms operate in these bulk compounds due to a concerted
+effect of charge-transfer, defects, reduction of interlayer hopping, and
+stacking. This highlights how Ising superconductivity can, unexpectedly, arise
+in bulk materials, and possibly enable the design of bulk superconductors that
+are resilient to magnetic fields.",2304.03074v1
+2023-05-20,$\mathbb{Z}_n$ symmetry broken supersolid in spin-orbit-coupled Bose-Einstein condensates,"Supersolid is an exotic state of matter characterized by both superfluid
+properties and periodic particle density modulation, due to spontaneous
+breaking of U(1) gauge symmetry and spatial translation symmetry, respectively.
+For conventional supersolids,continuous translation symmetry breaking is
+accompanied by one gapless Goldstone mode in the excitation spectra. An
+interesting question naturally arises: what is the consequence of breaking
+discrete translation symmetry for supersolids? In this work, we propose the
+concept of $\mathbb{Z}_n$ supersolid resulting from spontaneous breaking of a
+discrete $\mathbb{Z}_n$ symmetry, or equivalently, a discrete translation
+symmetry. This $\mathbb{Z}_n$ supersolid is realized in the stripe phase of
+spin-orbit-coupled Bose-Einstein condensate under an external periodic
+potential with period $1/n$ of intrinsic stripe period. For $n\geq2$, there are
+$n$ degenerate ground states with spontaneously broken lattice translation
+symmetry. The low-energy excitations of $\mathbb{Z}_n$ supersolid include a
+pseudo-Goldstone mode, whose excitation gap at long wavelength limit is found
+to decrease fast with $n$. We further numerically show that, when confined in a
+harmonic trap, a spin-dependent perturbation can result in the transition
+between degenerate ground states of $\mathbb{Z}_n$ supersolid. With the integer
+$n$ tunable using the experimental technique of generating subwavelength
+optical lattice, the $\mathbb{Z}_n$ supersolid proposed here offers a cold atom
+platform to simulate physics related with generic $\mathbb{Z}_n$ symmetry
+breaking, which is interesting not only in the field of cold atoms, but also in
+particle physics and cosmology.",2305.12069v1
+2023-07-25,"Tuning the magnetic properties in MPS3 (M = Mn, Fe, and Ni) by proximity-induced Dzyaloshinskii Moriya interactions","Tailoring the quantum many-body interactions in layered materials through
+appropriate heterostructure engineering can result in emergent properties that
+are absent in the constituent materials thus promising potential future
+applications. In this article, we have demonstrated controlling the otherwise
+robust magnetic properties of transition metal phosphorus trisulphides
+(Mn/Fe/NiPS3) in their heterostructures with Weyl semimetallic MoTe2 which can
+be attributed to the Dzyaloshinskii Moriya (DM) interactions at the interface
+of the two different layered materials. While the DM interaction is known to
+scale with the strength of the spin-orbit coupling (SOC), we also demonstrate
+here that the effect of DM interaction strongly varies with the spin
+orientation/dimensionality of the magnetic layer and the low-energy electronic
+density of state of the spin-orbit coupled layer. The observations are further
+supported by a series of experiments on heterostructures with a variety of
+substrates/underlayers hosting variable SOC and electronic density of states.",2307.13400v1
+2023-10-05,Unconventional superconductivity in Sc$_2$Ir$_{4-x}$Si$_x$ by spin-orbit coupling driven flat band,"The kagome lattice is very attractive as it can host many novel quantum
+states, such as the charge density wave, superconductivity, quantum spin
+liquid, etc. Meanwhile, iridates often exhibit a strong spin-orbit coupling
+(SOC) effect due to the large atomic mass of 5$d$ elements, which has important
+implications for both the energy bands and the pairing symmetry of
+superconductors. For the Laves phase superconductor Sc$_2$Ir$_4$ with a kagome
+lattice, by doping Si to the Ir sites, we observed a nonmonotonic and two-dome
+like doping dependence of the superconducting transition temperature $T_{\rm
+c}$, which is typically found in many unconventional superconducting systems.
+Interestingly, for some samples, especially Sc$_2$Ir$_{3.5}$Si$_{0.5}$ with the
+optimal $T_{\rm c}$, after the suppression of superconductivity, the
+normal-state resistivity exhibits a semiconducting behavior; meanwhile, the
+specific heat coefficient shows an upturn which follows the relation
+$C/T\propto{\rm ln}(T_0/T)$ at low temperatures. Around the optimal doping, the
+resistance measurements exhibit strong superconducting fluctuations. And the
+superconductivity related specific heat can be fitted by the model of a
+$d$-wave gap after subtracting the normal-state background. These strongly
+suggest unconventional superconductivity and correlation effect in the samples,
+which is mainly induced by a flat band near the Fermi level when considering
+the SOC, as supported by the first-principles calculations. Our results reveal
+a new unconventional superconducting system Sc$_2$Ir$_{4-x}$Si$_x$ with strong
+correlation effects induced by the flat band in the kagome system with strong
+SOC.",2310.03609v1
+2023-11-28,Spin-Orbital Coupling in All-Inorganic Metal-Halide Perovskites: the Hidden Force that Matters,"Highlighted with improved long-term thermal and environmental stability,
+all-inorganic metal halide perovskites exhibit tunable physical properties,
+cost-effective synthesis, and satisfactory optoelectronic performance,
+attracting increasing research interests worldwide. However, a less explored
+feature of these materials is their strong spin-orbit coupling (SOC), which is
+the hidden force influencing not only band structure but also properties
+including magnetoresistance, spin lifetime and singlet-triplet splitting. This
+review provides an overview of the fundamental aspects and the latest progress
+of the SOC and debate regarding Rashba effects in all-inorganic metal halide
+perovskites, providing critical insights into the physical phenomena and
+potential applications. Meanwhile, crystal structures and photophysics of
+all-inorganic perovskite are discussed in the context of SOC, along with the
+related experimental and characterization techniques. Furthermore, a recent
+understanding of the band topology in the all-inorganic halide perovskites is
+introduced to push the boundary even further for the novel applications of
+all-inorganic halide perovskites. Finally, an outlook is given on the potential
+directions of breakthroughs via leveraging the SOC in halide perovskites.",2311.16695v1
+2024-01-18,Stable semivortex gap solitons in a spin-orbit-coupled Fermi gas,"We demonstrate the existence of semivortex (SV) solitons, with vorticities
+$0$ and $1$ in the two components, in a two-dimensional (2D) fermionic spinor
+system under the action of the Rashba-type spin-orbit coupling in the
+combination with the Zeeman splitting (ZS). In the ``heavy-atom"" approximation,
+which was previously elaborated for the bosonic system, the usual kinetic
+energy is neglected, which gives rise to a linear spectrum with a bandgap. The
+model includes the effective Pauli self-repulsion with power $7/3$, as produced
+by the density-functional theory of Fermi superfluids. In the general case, the
+inter-component contact repulsion is included too. We construct a family of gap
+solitons of the SV type populating the spectral bandgap. A stability region is
+identified for the SV solitons, by means of systematic simulations, in the
+parameter plane of the cross-repulsion strength and chemical potential. The
+stability region agrees with the prediction of the anti-Vakhitov-Kolokolov
+criterion, which is a relevant necessary stability condition for systems with
+self-repulsive nonlinearities. We also test the stability of the SV solitons
+against a sudden change of the ZS strength, which initiates robust oscillations
+in the spin state of the soliton due to transfer of particles between the
+system's components.",2401.10406v1
+2024-02-05,Intrinsic nonlinear Hall effect in two-dimensional honeycomb topological antiferromagnets,"Two-dimensional systems with honeycomb lattice are known to be a paradigmatic
+platform to explore the various types of Hall effects, owing to that the
+interplay of lattice geometry, spin-orbit coupling and magnetism can give rise
+to very rich features in the quantum geometry of wave functions. In this work,
+we consider honeycomb topological antiferromagets that are effectively
+described by a $\mathcal{PT}$-symmetric antiferromagnetic Kane-Mele model, and
+explore the evolution of its nonlinear Hall response with respect to the change
+of lattice anisotropy, chemical potential, and the direction of the N\'{e}el
+vector. Due to the $\mathcal{PT}$-symmetry, the leading-order Hall effect of
+quantum geometric origin is the intrinsic nonlinear Hall effect, which is a
+second-order effect of electric fields and is independent of the scattering
+time. We investigate the behavior of the intrinsic nonlinear Hall conductivity
+tensor across topological phase transitions driven by antiferromagnetic
+exchange field and lattice anisotropy and find that its components do not
+change sign, which is different from the extrinsic nonlinear Hall effect. In
+the weakly doped regime, we find that the intrinsic nonlinear Hall effect is
+valley-polarized. By varying the chemical potential, we find that the nonlinear
+Hall conductivity tensors exhibit kinks when the Fermi surface undergoes
+Lifshitz transitions. Furthermore, we find that the existence of spin-orbit
+coupling to lift the spin-rotation symmetry is decisive for the use of
+intrinsic nonlinear Hall effect to detect the direction of the N\'{e}el vector.
+Our work shows that the two-dimensional honeycomb topological antiferromagnets
+are an ideal class of material systems with rich properties for the study of
+intrinsic nonlinear Hall effect.",2402.02685v1
+2024-03-18,Tailoring topological band properties of twisted double bilayer graphene: effects due to spin-orbit coupling,"Our theoretical study unfolds the topological phase transitions (within bands
+of the Moir\'e super-lattice) in small angle twisted double bilayer graphene
+(tDBLG) under the influence of external gate voltage and intrinsic spin-orbit
+coupling (SOC) for both AB-AB and AB-BA stacking configurations. Utilizing a
+low-energy continuum model, we investigate the band structure and perform a
+comprehensive topological characterization of the system by analysing the
+direct band gap closing as well as various Chern numbers. In the absence of
+SOC, the tDBLG exhibits characteristics of a valley Hall insulator. However, in
+the presence of SOC, we observe a transition to a quantum spin Hall insulator
+state and band topology emerges in the parameter spaces of non-topological
+regime without SOC. Furthermore, we conduct a comparative analysis between
+untwisted double bilayer graphene and tDBLG to assess the impact of twisting on
+the system's properties. Our findings reveal the construction of topological
+phase diagrams that showcase distinct phases arising from changes in the twist
+angle compared to the untwisted case. These phase diagrams provide valuable
+insights into the diverse topological phases achievable in tDBLG with SOC. Our
+findings contribute to the understanding of the interplay between small twist
+angle, SOC, and external electric field on the topological band properties of
+twisted multilayer graphene systems.",2403.11660v1
+1992-12-09,Theory of Anisotropic Superexchange in Insulating Cuprates,"Spin-orbit corrections to superexchange are calculated using the method of
+Moriya [T.\ Moriya, {\it Phys.\ Rev.}~{\bf 120} 91, (1960)] for two of the
+insulating parent compounds of the cuprate superconductors: (1)
+La$_{2-x}$Nd$_x$CuO$_4$ where the CuO$_6$ octahedra forming each Cu-O layer are
+tilted in staggered fashion about an axis which depends on $x$ and temperature;
+and (2) YBa$_2$Cu$_3$O$_{6+x}$ ($x \alt 0.4$) where the Cu-O layers form
+CuO$_2$-Y-CuO$_2$ bilayers in which the in-plane O$^{2-}$ ions are displaced
+uniformly towards the Y$^{3+}$ layer. For (1) a simple formula is derived for
+the weak ferromagnetic moment in each Cu-O layer as a function of the tilting
+axis and magnitude. For (2) it is shown that the anisotropic corrections to
+superexchange are different from what has previously been assumed. For the
+correct spin Hamiltonian a classical N\'eel state in which the Cu spins are
+lying in the plane is unstable in a single Cu-O layer, but when a bilayer is
+considered there is a critical value of the interlayer exchange coupling which
+stabilizes this state. For both cases (1) and (2) spin-wave spectra are
+calculated and shown to compare favorably with experiment.",9212015v1
+2001-12-20,Mechanism of unconventional superconductivity induced by skyrmion excitations in two-dimensional strongly-correlated electron systems,"We propose a mechanism of unconventional superconductivity in two-dimensional
+strongly-correlated electron systems. We consider a two-dimensional Kondo
+lattice system or double-exchange system with spin-orbit coupling arising from
+buckling of the plane. We show that a Chern-Simons term is induced for a gauge
+field describing the phase fluctuations of the localized spins. Through the
+induced Chern-Simons term, carriers behave like skyrmion excitations that lead
+to a destruction mechanism of magnetic long-range order by carrier doping.
+After magnetic long-range order is destroyed by carrier doping, the
+Chern-Simons term plays a dominant role and the attractive interaction between
+skyrmions leads to unconventional superconductivity. For the case of the
+ferromagnetic interaction between the localized spins, the symmetry of the
+Cooper pair is p-wave ($p_x \pm ip_y$). For the case of the antiferromagnetic
+interaction between the localized spins, the symmetry of the Cooper pair is
+d-wave ($d_{x^2-y^2}$). Applications to various systems are discussed, in
+particular to the high-$T_c$ cuprates.",0112374v1
+2003-03-29,Superconductivity in Sr$_2$RuO$_4$ Mediated by Coulomb Scattering,"We investigate the superconductivity in Sr$_2$RuO$_4$ on the basis of the
+three-dimensional three-band Hubbard model. We propose a model with Coulomb
+interactions among the electrons on the nearest-neighbor Ru sites. In our model
+the intersite Coulomb repulsion and exchange coupling can work as the effective
+interaction for the spin-triplet paring. This effective interaction is enhanced
+by the band hybridization, which is mediated by the interlayer transfers. We
+investigate the possibility of this mechanism in the ground state and find that
+the orbital dependent spin-triplet superconductivity is more stable than the
+spin-singlet one for realistic parameters. This spin-triplet superconducting
+state has horizontal line nodes on the Fermi surface.",0303620v1
+2004-08-09,"Role of Disorder in Mn:GaAs, Cr:GaAs, and Cr:GaN","We present calculations of magnetic exchange interactions and critical
+temperature T_c in Mn:GaAs, Cr:GaAs and Cr:GaN. The local spin density
+approximation is combined with a linear-response technique to map the magnetic
+energy onto a Heisenberg hamiltonion, but no significant further approximations
+are made. Special quasi-random structures in large unit cells are used to
+accurately model the disorder. T_c is computed using both a spin-dynamics
+approach and the cluster variation method developed for the classical
+Heisenberg model.
+  We show the following: (i) configurational disorder results in large
+dispersions in the pairwise exchange interactions; (ii) the disorder strongly
+reduces T_c; (iii) clustering in the magnetic atoms, whose tendency is
+predicted from total-energy considerations, further reduces T_c. Additionally
+the exchange interactions J(R) are found to decay exponentially with distance
+R^3 on average; and the mean-field approximation is found to be a very poor
+predictor of T_c, particularly when J(R) decays rapidly. Finally the effect of
+spin-orbit coupling on T_c is considered. With all these factors taken into
+account, T_c is reasonably predicted by the local spin-density approximation in
+MnGaAs without the need to invoke compensation by donor impurities.",0408185v1
+2005-05-04,Superconductors without an inversion center of symmetry: The s-wave state,"In materials without an inversion center of symmetry the spin degeneracy of
+the conducting band is lifted by an antisymmetric spin orbit coupling (ASOC).
+Under such circumstances, spin and parity cannot be separately used to classify
+the Cooper pairing states. Consequently, the superconducting order parameter is
+generally a mixture of spin singlet and triplet pairing states. In this paper
+we investigate the structure of the order parameter and its response to
+disorder for the most symmetric pairing state ($A_1$). Using the example of the
+heavy Fermion superconductor CePt$_3$Si, we determine characteristic properties
+of the superconducting instability as a function of (non-magnetic) impurity
+concentrations. Moreover, we explore the possibility of the presence of
+accidental line nodes in the quasiparticle gap. Such nodes would be essential
+to explain recent low-temperature data of thermodynamic quantities such as the
+NMR-$T_1^{-1}$, London penetration depth, and heat conductance.",0505108v2
+2006-03-23,Extrinsic Entwined with Intrinsic Spin Hall Effect in Disordered Mesoscopic Bars,"We show that pure spin Hall current, flowing out of a four-terminal
+phase-coherent two-dimensional electron gas (2DEG) within inversion asymmetric
+semiconductor heterostructure, contains contributions from both the extrinsic
+mechanisms (spin-orbit dependent scattering off impurities) and the intrinsic
+ones (due to the Rashba coupling). While the extrinsic contribution vanishes in
+the weakly and strongly disordered limits, and the intrinsic one dominates in
+the quasiballistic limit, in the crossover transport regime the spin Hall
+conductance, exhibiting sample-to-sample large fluctuations and sign change, is
+not simply reducible to either of the two mechanisms, which can be relevant for
+interpretation of experiments on dirty 2DEGs [V. Sih et al., Nature Phys. 1, 31
+(2005)].",0603595v1
+2006-06-19,"Giant current-driven domain wall mobility in (Ga,Mn)As","We study theoretically hole current-driven domain wall dynamics in (Ga,Mn)As.
+We show that the spin-orbit coupling causes significant hole reflection at the
+domain wall, even in the adiabatic limit when the wall is much thicker than the
+Fermi wavelength, resulting in spin accumulation and mistracking between
+current-carrying spins and the domain wall magnetization. This increases the
+out-of-plane non-adiabatic spin transfer torque and consequently the
+current-driven domain wall mobility by three to four orders of magnitude.
+Trends and magnitude of the calculated domain wall current mobilities agree
+with experimental findings.",0606498v3
+2006-07-14,Zeeman splitting in ballistic hole quantum wires,"We have studied the Zeeman splitting in ballistic hole quantum wires formed
+in a (311)A quantum well by surface gate confinement. Transport measurements
+clearly show lifting of the spin degeneracy and crossings of the subbands when
+an in-plane magnetic field B is applied parallel to the wire. When B is
+oriented perpendicular to the wire, no spin-splitting is discernible up to B =
+8.8 T. The observed large Zeeman splitting anisotropy in our hole quantum wires
+demonstrates the importance of quantum-confinement for spin-splitting in
+nanostructures with strong spin-orbit coupling.",0607355v1
+2006-10-02,g-Factor Tuning and Manipulation of Spins by an Electric Current,"We investigate the Zeeman splitting of two-dimensional electrons in an
+asymmetric silicon quantum well, by electron-spin-resonance (ESR) experiments.
+Applying a small dc current we observe a shift in the resonance field due to
+the additional current-induced Bychkov-Rashba (BR) type of spin-orbit (SO)
+field. This finding demonstrates SO coupling in the most straightforward way:
+in the presence of a transverse electric field the drift velocity of the
+carriers imposes an effective SO magnetic field. This effect allows selective
+tuning of the g-factor by an applied dc current. In addition, we show that an
+ac current may be used to induce spin resonance very efficiently.",0610046v1
+2007-02-08,Two-dimensional spin-filtered chiral network model for the Z_2 quantum spin-Hall effect,"The effects of static disorder on the Z_2 quantum spin-Hall effect for
+non-interacting electrons propagating in two-dimensional space is studied
+numerically. A two-dimensional time-reversal symmetric network model is
+constructed to account for the effects of static disorder on the propagation of
+non-interacting electrons subjected to spin-orbit couplings. This network model
+is different from past network models belonging to the symplectic symmetry
+class in that the propagating modes along the links of the network can be
+arranged into an odd number of Kramers doublet. It is found that (1) a
+two-dimensional metallic phase of finite extent is embedded in a Z_2 insulating
+phase in parameter space and (2) the quantum phase transitions between the
+metallic and Z_2 insulating phases belong to the conventional symplectic
+universality class in two space dimensions.",0702199v2
+2002-02-24,Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions,"Some of the most promising proposals for scalable solid-state quantum
+computing, e.g., those using electron spins in quantum dots or donor electron
+or nuclear spins in Si, rely on a two-qubit quantum gate that is ideally
+generated by an isotropic exchange interaction. However, an anisotropic
+perturbation arising from spin-orbit coupling is inevitably present. Previous
+studies focused on removing the anisotropy. Here we introduce a new universal
+set of quantum logic gates that takes advantage of the anisotropic
+perturbation. The price is a constant but modest factor in additional pulses.
+The gain is a scheme that is compatible with the naturally available
+interactions in spin-based solid-state quantum computers.",0202135v2
+2007-05-14,Broken spin-Hall accumulation symmetry by magnetic field and coexisted Rashba and Dresselhaus interactions,"The spin-Hall effect in the two-dimensional electron gas (2DEG) generates
+symmetric out-of-plane spin Sz accumulation about the current axis in the
+absence of external magnetic field. Here we employ the real space
+Landauer-Keldysh formalism [B. K. Nikolic et al., Phys. Rev. Lett. 95, 046601
+(2005); Phys. Rev. B 73, 075303 (2006)] by considering a four-terminal setup to
+investigate the circumstances in which this symmetry is broken. For the absence
+of Dresselhaus interaction, starting from the applied out-of-plane B
+corresponding to Zeeman splitting energy 0 - 0.5 times the Rashba hopping
+energy tR, the breaking process is clearly seen. The influence of the Rashba
+interaction on the magnetization of the 2DEG is studied herein. For coexisted
+Rashba tR and Dresselhaus tD spin-orbit couplings in the absence of B,
+interchanging tR and tD reverses the entire accumulation pattern.",0705.1884v1
+2007-11-03,Magnetic Properties in Non-centrosymmetric Superconductors with and without Antiferromagnetic Order,"The paramagnetic properties in non-centrosymmetric superconductors with and
+without antiferromagnetic (AFM) order are investigated with focus on the heavy
+Fermion superconductors, CePt_3Si, CeRhSi_3 and CeIrSi_3. First, we investigate
+the spin susceptibility in the linear response regime and elucidate the role of
+AFM order. The spin susceptibility at T=0 is independent of the pairing
+symmetry and increases in the AFM state. Second, the non-linear response to the
+magnetic field are investigated on the basis of an effective model for CePt_3Si
+which may be also applicable to CeRhSi_3 and CeIrSi_3. The role of
+antisymmetric spin-orbit coupling (ASOC), helical superconductivity,
+anisotropic Fermi surfaces and AFM order are examined in the dominantly s-, p-
+and d-wave states. We emphasize the qualitatively important role of the mixing
+of superconducting (SC) order parameters in the p-wave state which enhances the
+spin susceptibility and suppresses paramagnetic depairing effect in a
+significant way. Therefore, the dominantly p-wave superconductivity admixed
+with the s-wave order parameter is consistent with the paramagnetic properties
+of CePt_3Si at ambient pressure. We propose some experiments which can
+elucidate the novel pairing states in CePt_3Si as well as CeRhSi_3 and
+CeIrSi_3.",0711.0440v1
+2008-01-25,Ab initio study of spin-dependent transport in carbon nanotubes with iron and vanadium adatoms,"We present an ab initio study of spin dependent transport in armchair carbon
+nanotubes with transition metal adsorbates, iron or vanadium. We neglect the
+effect of tube curvature and model the nanotube by graphene with periodic
+boundary conditions. A density functional theory based nonequilibrium Green's
+function method is used to compute the electronic structure and zero-bias
+conductance. The presence of the adsorbate causes a strong scattering of
+electrons of one spin type only. The scattering is shown to be due to coupling
+of the two armchair band states to the metal 3d orbitals with matching symmetry
+causing Fano resonances appearing as dips in the transmission function. The
+spin type (majority/minority) being scattered depends on the adsorbate and is
+explained in terms of d-state filling. The results are qualitatively reproduced
+using a simple tight-binding model, which is then used to investigate the
+dependence of the transmission on the nanotube width. We find a decrease in the
+width of the transmission dip as the tube-size increases.",0801.3997v1
+2008-03-19,Spin-Orbit Coupling and Ion Displacements in Multiferroic TbMnO3,"The electronic and magnetic properties of TbMnO3 leading to its ferroelectric
+(FE) polarization were investigated on the basis of relativistic density
+functional theory (DFT) calculations. In agreement with experiment, we show
+that the spin-spiral plane of TbMnO3 can be either the bc- or ab-plane, but not
+the ac-plane. As for the mechanism of FE polarization, our work reveals that
+the ""pure electronic"" model by Katsura, Nagaosa and Balatsky (KNB) is
+inadequate in predicting the absolute direction of FE polarization. For the
+ab-plane spin-spiral state of TbMnO3, the direction of FE polarization
+predicted by the KNB model is opposite to that predicted by DFT calculations.
+In determining the magnitude and the absolute direction of FE polarization in
+spin-spiral states, it is found crucial to consider the displacements of the
+ions from their ecntrosymmetric positions.",0803.2741v4
+2008-12-31,A new mechanism of electric dipole spin resonance: hyperfine coupling in quantum dots,"A recently discovered mechanism of electric dipole spin resonance, mediated
+by the hyperfine interaction, is investigated experimentally and theoretically.
+The effect is studied using a spin-selective transition in a GaAs double
+quantum dot. The resonant frequency is sensitive to the instantaneous hyperfine
+effective field, revealing a nuclear polarization created by driving the
+resonance. A device incorporating a micromagnet exhibits a magnetic field
+difference between dots, allowing electrons in either dot to be addressed
+selectively. An unexplained additional signal at half the resonant frequency is
+presented.",0901.0124v1
+2009-08-13,Predicted band structures of III-V semiconductors in wurtzite phase,"While non-nitride III-V semiconductors typically have a zincblende structure,
+they may also form wurtzite crystals under pressure or when grown as
+nanowhiskers. This makes electronic structure calculation difficult since the
+band structures of wurtzite III-V semiconductors are poorly characterized. We
+have calculated the electronic band structure for nine III-V semiconductors in
+the wurtzite phase using transferable empirical pseudopotentials including
+spin-orbit coupling. We find that all the materials have direct gaps. Our
+results differ significantly from earlier {\it ab initio} calculations, and
+where experimental results are available (InP, InAs and GaAs) our calculated
+band gaps are in good agreement. We tabulate energies, effective masses, and
+linear and cubic Dresselhaus zero-field spin-splitting coefficients for the
+zone-center states. The large zero-field spin-splitting coefficients we find
+may lead to new functionalities for designing devices that manipulate spin
+degrees of freedom.",0908.1984v1
+2010-08-20,Charge-induced spin polarization in non-magnetic organic molecule Alq$_{3}$,"Electrical injection in organic semiconductors is a key prerequisite for the
+realization of organic spintronics. Using density-functional theory
+calculations we report the effect of electron transfer into the organic
+molecule Alq$_3$. Our first-principles simulations show that electron injection
+spontaneously spin-polarizes non-magnetic Alq$_3$ with a magnetic moment
+linearly increasing with induced charge. An asymmetry of the Al--N bond lengths
+leads to an asymmetric distribution of injected charge over the molecule. The
+spin-polarization arises from a filling of dominantly the nitrogen $p_z$
+orbitals in the molecule's LUMO together with ferromagnetic coupling of the
+spins on the quinoline rings.",1008.3525v2
+2011-03-05,"Low-moment magnetism in the double perovskites Ba2MOsO6 (M=Li,Na)","The magnetic ground states of the isostructural double perovskites
+Ba$_2$NaOsO$_6$ and Ba$_2$LiOsO$_6$ are investigated with muon-spin rotation.
+In Ba$_2$NaOsO$_6$ long-range magnetic order is detected via the onset of a
+spontaneous muon-spin precession signal below $T_{\mathrm{c}}=7.2\pm
+0.2\;\mathrm{K}$, while in Ba$_2$LiOsO$_6$ a static but spatially-disordered
+internal field is found below 8 K. A novel probabilistic argument is used to
+show from the observed precession frequencies that the magnetic ground state in
+Ba$_2$NaOsO$_6$ is most likely to be low-moment ($\approx 0.2$\,$\mu_{\rm B}$)
+ferromagnetism and not canted antiferromagnetism. Ba$_2$LiOsO$_6$ is
+antiferromagnetic and we find a spin-flop transition at 5.5\,T. A reduced
+osmium moment is common to both compounds, probably arising from a combination
+of spin-orbit coupling and frustration.",1103.1039v2
+2011-03-23,Time-reversal-symmetry-broken quantum spin Hall effect,"Quantum spin Hall (QSH) state of matter is usually considered to be protected
+by time-reversal (TR) symmetry. We investigate the fate of the QSH effect in
+the presence of the Rashba spin-orbit coupling and an exchange field, which
+break both inversion and TR symmetries. It is found that the QSH state
+characterized by nonzero spin Chern numbers $C_{\pm}=\pm 1$ persists when the
+TR symmetry is broken. A topological phase transition from the TR
+symmetry-broken QSH phase to a quantum anomalous Hall phase occurs at a
+critical exchange field, where the bulk band gap just closes. It is also shown
+that the transition from the TR symmetry-broken QSH phase to an ordinary
+insulator state can not happen without closing the band gap.",1103.4473v2
+2011-06-30,Doping the Kane-Mele-Hubbard model: A Slave-Boson Approach,"We study the Kane-Mele-Hubbard model both at half-filling and away from
+half-filling using a slave-boson mean-field approach at zero temperature. We
+obtain a phase diagram at half-filling and discuss its connection to recent
+results from quantum Monte Carlo, slave-rotor, and $Z_2$ mean-field studies. In
+particular, we find a small window in parameter space where a spin liquid phase
+with gapped spin and charge excitations reside. Upon doping, we show the spin
+liquid state becomes a superconducting state by explicitly calculating the
+singlet pairing order parameters. Interestingly, we find an ""optimal"" doping
+for such superconductivity. Our work reveals some of the phenomenology
+associated with doping an interacting system with strong spin-orbit coupling.",1107.0007v2
+2011-08-30,Electrically tunable quantum anomalous Hall effect in 5d transition-metal adatoms on graphene,"The combination of the unique properties of graphene with spin polarization
+and magnetism for the design of new spintronic concepts and devices has been
+hampered by the small Coulomb interaction and the tiny spin-orbit coupling of
+carbon in pristine graphene. Such device concepts would take advantage of the
+control of the spin degree of freedom utilizing the widely available electric
+fields in electronics or of topological transport mechanisms such as the
+conjectured quantum anomalous Hall effect. Here we show, using first-principles
+methods, that 5d transition-metal (TM) adatoms deposited on graphene display
+remarkable magnetic properties. All considered TM adatoms possess significant
+spin moments with colossal magnetocrystalline anisotropy energies as large as
+50 meV per TM atom. We reveal that the magneto-electric response of deposited
+TM atoms is extremely strong and in some cases offers even the possibility to
+switch the spontaneous magnetization direction by a moderate external electric
+field. We predict that an electrically tunable quantum anomalous Hall effect
+can be observed in this type of hybrid materials.",1108.5915v1
+2011-10-31,One-sign order parameter in iron based superconductor,"The onset of superconductivity at the transition temperature is marked by the
+onset of order, which is characterized by an energy gap. Most models of the
+iron-based superconductors find a sign-changing (s\pm) order parameter [1-6],
+with the physical implication that pairing is driven by spin fluctuations.
+Recent work, however, has indicated that LiFeAs has a simple isotropic order
+parameter [7-9] and spin fluctuations are not necessary [7,10], contrary to the
+models [1-6]. The strength of the spin fluctuations has been controversial
+[11,12], meaning that the mechanism of superconductivity cannot as yet be
+determined. Here we report the momentum dependence of the superconducting
+energy gap, where we find an anisotropy that rules out coupling through spin
+fluctuations and the sign change. The results instead suggest that orbital
+fluctuations assisted by phonons [13,14] are the best explanation for
+superconductivity.",1110.6922v2
+2012-02-15,Current-induced motion of a transverse magnetic domain wall in the presence of spin Hall effect,"We theoretically study the current-induced dynamics of a transverse magnetic
+domain wall in bi-layer nanowires consisting of a ferromagnet on top of a
+nonmagnet having strong spin-orbit coupling. Domain wall dynamics is
+characterized by two threshold current densities, $J_{th}^{WB}$ and
+$J_{th}^{REV}$, where $J_{th}^{WB}$ is a threshold for the chirality switching
+of the domain wall and $J_{th}^{REV}$ is another threshold for the reversed
+domain wall motion caused by spin Hall effect. Domain walls with a certain
+chirality may move opposite to the electron-flow direction with high speed in
+the current range $J_{th}^{REV} < J < J_{th}^{WB}$ for the system designed to
+satisfy the conditions $J_{th}^{WB} > J_{th}^{REV}$ and \alpha > \beta, where
+\alpha is the Gilbert damping constant and \beta is the nonadiabaticity of spin
+torque. Micromagnetic simulations confirm the validity of analytical results.",1202.3450v1
+2012-03-22,Enhanced anisotropic spin fluctuations below tetragonal-to-orthorhombic transition in LaFeAs(O_{1-x}F_x) probed by ^{75}As and ^{139}La NMR,"$^{75}$As and $^{139}$La NMR results of LaFeAs(O$_{1-x}$F$_x$) ($x$=0, 0.025,
+and 0.04) were reported. Upon F-doping, the tetragonal-to-orthorhombic
+structural phase transition temperature $T_S$, antiferromagnetic transition
+temperature $T_N$ and internal magnetic field $\mu_0H_{\rm int}$ are gradually
+reduced for $x<0.04$. However, at $x=0.04$, $T_N$ is abruptly suppressed to be
+30 K along with a tiny $\mu_0H_{\rm int}$, which is distinct from the
+continuous disappearance of the ordered phases in the Ba122 systems of
+Ba(Fe,Co)$_2$As$_2$ and BaFe$_2$(As,P)$_2$. The anisotropy of the spin-lattice
+relaxation rate $T_1^{-1}$, $(T_1)^{-1}_{H\parallel ab}/(T_1)^{-1}_{H\parallel
+c}$, in the paramagnetic phase of $x = 0$ and 0.025 is constant ($\sim 1.5$),
+but increases abruptly below $T_S$ due to the enhancement of
+$(T_1)^{-1}_{H\parallel ab}$ by the slowing down of magnetic fluctuations. This
+indicates that the tetragonal-to-orthorhombic structural distortion enhances
+the anisotropy in the spin space via magnetoelastic coupling and/or spin-orbit
+interaction.",1203.4937v1
+2012-07-12,Electrical control of the Kondo effect in a helical edge liquid,"Magnetic impurities affect the transport properties of the helical edge
+states of quantum spin Hall insulators by causing single-electron
+backscattering. We study such a system in the presence of a Rashba spin-orbit
+interaction induced by an external electric field, showing that this can be
+used to control the Kondo temperature, as well as the correction to the
+conductance due to the impurity. Surprisingly, for a strongly anisotropic
+electron-impurity spin exchange, Kondo screening may get obstructed by the
+presence of a non-collinear spin interaction mediated by the Rashba coupling.
+This challenges the expectation that the Kondo effect is stable against
+time-reversal invariant perturbations.",1207.3028v3
+2012-07-27,Topological phase transitions driven by next-nearest-neighbor hopping in two-dimensional lattices,"For two-dimensional lattices in a tight-binding description, the intrinsic
+spin-orbit coupling, acting as a complex next-nearest-neighbor hopping, opens
+gaps that exhibit the quantum spin Hall effect. In this paper, we study the
+effect of a real next-nearest-neighbor hopping term on the band structure of
+several Dirac systems. In our model, the spin is conserved, which allows us to
+analyze the spin Chern numbers. We show that in the Lieb, kagome, and T_3
+lattices, variation of the amplitude of the real next-nearest-neighbor hopping
+term drives interesting topological phase transitions. These transitions may be
+experimentally realized in optical lattices under shaking, when the ratio
+between the nearest- and next-nearest-neighbor hopping parameters can be tuned
+to any possible value. Finally, we show that in the honeycomb lattice,
+next-nearest-neighbor hopping only drives topological phase transitions in the
+presence of a magnetic field, leading to the conjecture that these transitions
+can only occur in multigap systems.",1207.6545v3
+2012-11-01,Self-consistent spin-fluctuation spectrum and correlated electronic structure of actinides,"We present an overview of various theoretical methods with detailed emphasis
+on an intermediate Coulomb-U coupling model. This model is based on
+material-specific ab-initio band structure from which correlation effects are
+computed via self-consistent GW-based self-energy corrections arising from
+spin-fluctuations. We apply this approach to four isostructural intermetallic
+actinides PuCoIn5, PuCoGa5, PuRhGa5 belonging to the Pu-115 family, and UCoGa5,
+a member of the U-115 family. The 115 families share the property of spin-orbit
+split density of states enabling substantial spin fluctuations around 0.5 eV,
+whose feedback effect on the electronic structure create mass renormalization
+and electronic `hot spots`, i.e., regions of large spectral weight. A detailed
+comparison is provided for the angle-resolved and angle-integrated
+photoemission spectra and de Haas-van Alphen experimental data as available.
+The results suggest that this class of actinides is adequately described by the
+intermediate Coulomb interaction regime, where both itinerant and incoherent
+features coexist in the electronic structure.",1211.0240v1
+2013-01-06,Spin Susceptibility in Non-centrosymmetric Superconductors with Topological Transition of Fermi Surfaces,"The non-centrosymmetric superconductors Li2Pd3B and Li2Pt3B show different
+superconducting properties despite having the same crystal symmetry. Motivated
+by experimental results, we investigate the spin susceptibility of
+non-centrosymmetric superconductors accompanied by the topological transition
+of Fermi surfaces due to antisymmetric spin-orbit coupling, which is indicated
+by the first-principles band structure calculation for Li2Pt3B. We study three
+types of topological transition, namely, (A) the disappearance of the Fermi
+surface, (B) crossing the Dirac point, and (C) crossing the saddle point
+van-Hove singularity. The spin susceptibility in the superconducting state is
+increased by the topological transitions (A) and (C), while it is decreased by
+(B). We discuss the unusual magnetic properties observed in Li2Pt3B on the
+basis of these results.",1301.0976v2
+2013-01-15,Mechanisms for Sub-Gap Optical Conductivity in Herbertsmithite,"Recent terahertz conductivity measurements observed low-power-law frequency
+dependence of optical conduction within the Mott gap of the Kagome lattice
+spin-liquid candidate Herbertsmithite. We investigate mechanisms for this
+observed sub-gap conductivity for two possible scenarios in which the
+ground-state is described by: 1) a U(1) Dirac spin-liquid with emergent
+fermionic spinons or 2) a nearly critical Z2 spin-liquid in the vicinity of a
+continuous quantum phase transition to magnetic order. We identify new
+mechanisms for optical-absorption via magneto-elastic effects and spin- orbit
+coupling. In addition, for the Dirac spin-liquid scenario, we establish an
+explicit microscopic origin for previously proposed absorption mechanisms based
+on slave-particle effective field theory descriptions.",1301.3495v2
+2013-01-17,Electrically Tunable Topological State in [111] Perovskite Materials with Antiferromagnetic Exchange Field,"A topological state with simultaneous nonzero Chern number and spin Chern
+number is possible for electrons on honeycomb lattice based on band engineering
+by staggered electric potential and antiferromagnetic exchange field in
+presence of intrinsic spin-orbit coupling. With first principles calculation we
+confirm that the scheme can be realized by material modification in perovskite
+G-type antiferromagnetic insulators grown along [111] direction, where d
+electrons hop on a single buckled honeycomb lattice. This material is ideal for
+spintronics applications, since it provides a spin-polarized quantized edge
+current, robust to both nonmagnetic and magnetic defects, with the spin
+polarization tunable by inverting electric field.",1301.4113v1
+2013-03-09,The fundamental differences between Quantum Spin Hall edge-states at zig-zag and armchair terminations of honeycomb and ruby nets,"Combining an analytical and numerical approach we investigate the dispersion
+of the topologically protected spin-filtered edge-states of the Quantum Spin
+Hall state on honeycomb and ruby nets with zigzag (ZZ) and armchair (AC) edges.
+We show that the Fermi velocity of the helical edge-states on ZZ edges
+increases linearly with the strength of the spin-orbit coupling (SOC) whereas
+for AC edges the Fermi velocity is independent of the SOC. Also the decay
+length of edge states into the bulk is dramatically different for AC and ZZ
+edges, displaying an inverse functional dependence on the SOC.",1303.2252v1
+2013-03-27,Observation of the geometric spin Hall effect of light,"The spin Hall effect of light (SHEL) is the photonic analogue of spin Hall
+effects occurring for charge carriers in solid-state systems. Typical examples
+of this intriguing phenomenon occur when a light beam refracts at an air-glass
+interface, or when it is projected onto an oblique plane, the latter effect
+being known as geometric SHEL. It amounts to a polarization-dependent
+displacement perpendicular to the plane of incidence. Here, we experimentally
+demonstrate the geometric SHEL for a light beam transmitted across an oblique
+polarizer. We find that the spatial intensity distribution of the transmitted
+beam depends on the incident state of polarization and its centroid undergoes a
+positional displacement exceeding one wavelength. This novel phenomenon is
+virtually independent from the material properties of the polarizer and, thus,
+reveals universal features of spin-orbit coupling.",1303.6974v4
+2013-06-27,Finding the Rashba-type spin-splitting from interband scattering in quasiparticle interference maps,"We have studied the BiCu$_2$/Cu(111) surface alloy using low-temperature
+scanning tunneling microscopy and spectroscopy. We observed standing waves
+caused by scattering off defects and step edges. Different from previous
+studies on similar Rashba-type surfaces, we identified multiple scattering
+vectors that originate from various intraband as well as interband scattering
+processes. A detailed energy-dependent analysis of the standing-wave patterns
+enables a quantitative determination of band dispersions, including the Rashba
+splitting. The results are in good agreement with ARPES data and demonstrate
+the usefulness of this strategy to determine the band structure of Rashba
+systems. The lack of other possible scattering channels will be discussed in
+terms of spin conservation and hybridization effects. The results open new
+possibilities to study spin-dependent scattering on complex spin-orbit coupled
+surfaces.",1306.6662v1
+2014-08-06,"Half metallic ferromagnetism in tri-layered perovskites Sr$_4$T$_{3}$O$_{10}$ (T=Co, Rh)","First-principles density functional theory (DFT) is used to investigate the
+electronic and magnetic properties of Sr$_4$Rh$_3$O$_{10}$, a member of the
+Ruddlesden-Popper series. Based on the DFT calculations taking into account the
+co-operative effect of Coulomb interaction ($U$) and spin-orbit couplings
+(SOC), Sr$_4$Rh$_3$O$_{10}$ is found to be a half metallic ferromagnet (HMF)
+with total angular moment $\mu_{\rm {tot}}$=12$\mu_B$ per unit cell. The
+material has almost 100$\%$ spin-polarization at the Fermi level despite of
+sizable SOC. Replacement of Rh atom by the isovalent Co atom is considered.
+Upon full-replacement of Co, a low-spin to intermediate spin transition happens
+resulting in a HMF state with the total angular moment three-time larger (i.e.
+$\mu_{\rm {tot}}$=36$\mu_B$ per unit cell), compared to Sr$_4$Rh$_3$O$_{10}$.
+We propose Sr$_4$Rh$_3$O$_{10}$ and Sr$_4$Co$_3$O$_{10}$ as candidates of half
+metals.",1408.1216v1
+2014-08-08,Half Metal Transition Driven by Doping Effects in Osmium Double Perovskite,"Using the first-principles density functional approach, we investigate
+Ca$_2$FeOsO$_6$, a material of double perovskite structure synthesized
+recently. According to the calculations, Ca$_2$FeOsO$_6$ is a ferrimagnetic
+Mott-insulator influenced by the cooperative effect of spin-orbit coupling
+(SOC) and Coulomb interactions of Fe-3$d$ and Os-5$d$ electrons, as well as the
+crystal field. When Fe is replaced with Ni, the system exhibits half metallic
+(HM) states desirable for spintronic applications. In
+[Ca$_2$Fe$_{1-x}$Ni$_x$OsO$_6$]$_2$, HM ferrimagnetism is observed with
+$\mu_{\rm tot}=2\mu_{\rm B}$ per unit cell for doping rate $x=0.5$, whereas HM
+antiferromagnetism (HMAFM) with nearly zero spin magnetization in the unit cell
+for $x=1$, respectively. It is emphasized that half metallicity is retained
+even with SOC effect due to the large exchange-splitting between spin-up and
+spin-down bands close to the Fermi level.",1408.1771v1
+2014-10-01,Transverse anisotropy effects on spin-resolved transport through large-spin molecules,"The transport properties of a large-spin molecule strongly coupled to
+ferromagnetic leads in the presence of transverse magnetic anisotropy are
+studied theoretically. The relevant spectral functions, linear-response
+conductance and the tunnel magnetoresistance are calculated by means of the
+numerical renormalization group method. We study the dependence of transport
+characteristics on orbital level position, uniaxial and transverse
+anisotropies, external magnetic field and temperature. It is shown that while
+uniaxial magnetic anisotropy leads to the suppression of the Kondo effect,
+finite transverse anisotropy can restore the Kondo resonance. The effect of
+Kondo peak restoration strongly depends on the magnetic configuration of the
+device and leads to nontrivial behavior of the tunnel magnetoresistance. We
+show that the temperature dependence of the conductance at points where the
+restoration of the Kondo effect occurs is universal and shows a scaling typical
+for usual spin-one-half Kondo effect.",1410.0315v1
+2015-01-23,Giant gap in the magnon excitations of the quasi-1D chain compound Sr3NiIrO6,"Inelastic neutron scattering on the spin-chain compound Sr$_3$NiIrO$_6$
+reveals gapped quasi-1D magnetic excitations. The observed one-magnon band
+between 29.5 and 39 meV consists of two dispersive modes. The spin wave
+spectrum could be well fitted with an antiferromagnetic anisotropic exchange
+model and single ion anisotropy on the Ni site. The extracted dominant
+anisotropic antiferromagnetic intra-chain exchange interaction between Ir and
+Ni ions are $J_z=19.5$ meV and $J_{xy}=12.1$ meV. These values justify previous
+electronic structure calculations, showing the importance of Ir spin orbit
+coupling on the electron correlations. The magnetic excitations survive up to
+200 K well above the magnetic ordering temperature of $T_N \sim 70$ K, also
+indicating a quasi-1D nature of the magnetic interactions in Sr$_3$NiIrO$_6$.
+Our results not only support the idea of the existence of a new temperature
+scale well above $T_N$, but also emphasize the need to consider new exchange
+paths complicated by the SOC, resulting in additional characteristic
+temperatures in such spin-chain systems.",1501.05735v1
+2015-06-16,Weyl nodes in periodic structures of superconductors and spin active materials,"Motivated by recent progress in epitaxial growth of proximity structures of
+s-wave superconductors (S) and spin-active materials (M), we show that the
+periodic structure of S and M can behave effectively as a superconductor with
+pairs of point nodes, near which the low energy excitations are Weyl fermions.
+A simple toy model, where M is described by a Kronig-Penney potential with both
+spin-orbit coupling and exchange field, is proposed and solved to obtain the
+phase diagram of the nodal structure, the spin texture of the Weyl fermions, as
+well as the zero energy surface states in the form of open Fermi lines (""Fermi
+arcs""). Going beyond the simple model, a lattice model with alternating layers
+of S and magnetic $Z_2$ topological insulators (M) is solved. The calculated
+spectrum confirms previous prediction of Weyl nodes based on tunneling
+Hamiltonian of Dirac electrons. Our results provide further evidence that
+periodic structures of S and M are well suited for engineering gapless
+topological superconductors.",1506.05166v2
+2015-07-12,Indirect Spin Exchange Interaction in Substituted Copper Phthalocyanine Crystalline Thin Films,"The origins of indirect spin exchange in crystalline thin films of Copper
+Octabutoxy Phthalocyanine (Cu-OBPc) are investigated using Magnetic Circular
+Dichroism (MCD) spectroscopy. These studies are made possible by a solution
+deposition technique which produces highly ordered films with macroscopic grain
+sizes suitable for optical studies. For temperatures lower than 2 K, the
+contribution of a specific state in the valence band manifold originating from
+the hybridized lone pair in nitrogen orbitals of the Phthalocyanine ring, bears
+the Brillouin-like signature of an exchange interaction with the localized
+$\textit{d}$-shell Cu spins. A comprehensive MCD spectral analysis coupled with
+a molecular field model of a $\sigma\pi-d$ exchange analogous to
+$\textit{sp-d}$ interactions in Diluted Magnetic Semiconductors (DMS) renders
+an enhanced Zeeman splitting and a modified $\textit{g}$-factor of -4 for the
+electrons that mediate the interaction. These studies define an experimental
+tool for identifying electronic states involved in spin-dependent exchange
+interactions in organic materials.",1507.03249v1
+2015-09-30,Electron spin rotations induced by oscillating Rashba interaction in a quantum wire,"A novel method and nanodevice are introduced that allows to rotate the single
+electron spin confined in a gated electrostatic InSb nanowire quantum dot.
+Proposed method does not require application of any (oscillating or static)
+external magnetic fields. Our proposal instead employs spatial and time
+modulation of confining potential induced by electric gates, which, in turn
+leads to oscillating Rashba type spin-orbit coupling. Moving electron back and
+forth in such a variable Rashba field allows for realization of spin rotations
+around two different axes separately without using an external magnetic field.
+The results are supported by realistic three-dimensional time dependent
+Poisson-Schr\""{o}dinger calculations for systems and material parameters
+corresponding to experimentally accessible structures.",1509.09145v2
+2016-04-16,"Spin-orbit excitation energies, anisotropic exchange, and magnetic phases of honeycomb RuCl3","Using quantum chemistry calculations we shed fresh light on the electronic
+structure and magnetic properties of RuCl3, a proposed realization of the
+honeycomb Kitaev spin model. It is found that the nearest-neighbor Kitaev
+exchange K is weaker than in 5d5 Ir oxides but still larger than other
+effective spin couplings. The electronic-structure computations also indicate a
+ferromagnetic K in the halide, which is supported by a detailed analysis of the
+field-dependent magnetization. From exact-diagonalization calculations for
+extended Kitaev-Heisenberg Hamiltonians we additionally find that a transition
+from zigzag order to a spin-liquid ground state can be induced in RuCl3 with
+external magnetic field.",1604.04755v1
+2016-07-15,"Honeycomb-lattice Heisenberg-Kitaev model in a magnetic field: Spin canting, metamagnetism, and vortex crystals","The Heisenberg-Kitaev model is a paradigmatic model to describe the magnetism
+in honeycomb-lattice Mott insulators with strong spin-orbit coupling, such as
+A$_2$IrO$_3$ (A = Na, Li) and $\alpha$-RuCl$_3$. Here we study in detail the
+physics of the Heisenberg-Kitaev model in an external magnetic field. Using a
+combination of Monte-Carlo simulations and spin-wave theory we map out the
+classical phase diagram for different directions of the magnetic field. Broken
+SU(2) spin symmetry renders the magnetization process rather complex, with
+sequences of phases and metamagnetic transitions. In particular, we find
+various large-unit-cell and multi-Q phases including a vortex-crystal phase for
+a field in the [111] direction. We also discuss quantum corrections in the
+high-field phase.",1607.04640v2
+2016-07-23,Magneto-optical transport properties of monolayer WSe2,"The recent experimental realization of a high quality WSe$% _{2} $ leads to
+the possibility of magneto-optical measurements and the manipulation of the
+spin and valley degrees of freedom. We study the influence of the very strong
+spin-orbit coupling and of the anisotropic lifting of the valley pseudospin
+degeneracy on its magnetotransport properties. The energy spectrum of WSe$_{2}
+$ is derived and discussed in the presence of a perpendicular magnetic field
+$B$. Correspondingly we evaluate the magneto-optical Hall conductivity and the
+optical longitudinal conductivity as functions of the frequency, magnetic
+field, and Fermi energy. They are strongly influenced by the field $B$ and the
+strong spin splitting. The former exhibits valley polarization and the latter
+beatings of oscillations. The magneto-optical responses can be tuned in two
+different regimes: the mictrowave-to-terahertz regime and the visible-frequency
+one. The absorption peaks involving the $n=0$ LL appear in between these two
+regimes and show a magnetic control of the spin and valley splittings. We also
+evaluate the power absorption spectrum.",1607.06917v1
+2016-09-28,Odd-parity superconductivity near inversion breaking quantum critical point in one dimension,"We study how an inversion-breaking quantum critical point affects the ground
+state of a one-dimensional electronic liquid with repulsive interaction and
+spin-orbit coupling. We find that regardless of the interaction strength, the
+critical fluctuations always lead to a gap in the electronic spin-sector. The
+origin of the gap is a two-particle backscattering process, which becomes
+relevant due to renormalization of the Luttinger parameter near the critical
+point. The resulting spin-gapped state is a one-dimensional version of spin
+triplet superconductivity. Interestingly, in the case of a ferromagnetic
+critical point the Luttinger parameter is renormalized in the opposite manner,
+such that the system remains non-superconducting.",1609.09084v3
+2017-02-08,Measuring Majorana non-locality and spin structure with a quantum dot,"Robust zero bias transport anomalies in semiconducting nanowires with
+proximity-induced superconductivity have been convincingly demonstrated in
+various experiments. While these are compatible with the existence of Majorana
+zero modes at the ends of the nanowire, a direct proof of their non-locality
+and topological protection is now needed. Here we show that a quantum dot at
+the end of the nanowire may be used as a powerful spectroscopic tool to
+quantify the degree of Majorana non-locality through a local transport
+measurement. Moreover, the spin polarization of dot sub-gap states at
+singlet-doublet transitions in the Coulomb blockade regime allows the dot to
+directly probe the spin structure of the Majorana wave function, and indirectly
+measure the spin-orbit coupling of the nanowire.",1702.02525v3
+2017-03-07,Magnetic-field orientation dependence of transport properties of topologically superconducting wire,"We present the study of transport properties of a superconducting wire with
+strong Rashba spin-orbit coupling for different orientations of an external
+magnetic field. Using the nonequilibrium Green's functions in the tight-binding
+approach the crucial impact of the relative alignment of lead magnetization and
+the Majorana bound state (MBS) spin polarization on the low-bias conductance
+and shot noise is presented. Depending on this factor the transport regime can
+effectively vary from symmetric to extremely asymmetric. In the last situation
+the current-symmetry breaking, the suppression of the MBS-assisted conductance
+and specific Fano factor behavior lead to current-switch effect. The
+persistence of these features under the presence of diagonal disorder and
+phenomenologically modeled g-factor anisotropy is demonstrated. In the case of
+paramagnetic leads the MBS spin polarization gives rise to the spin-filtering
+effect depending on the magnetic-field orientation.",1703.02320v3
+2017-08-11,Dimensional reduction by pressure in the magnetic framework material CuF$_{2}$(D$_{2}$O)$_{2}$pyz: from spin-wave to spinon excitations,"Metal organic magnets have enormous potential to host a variety of electronic
+and magnetic phases that originate from a strong interplay between the spin,
+orbital and lattice degrees of freedom. We control this interplay in the
+quantum magnet CuF$_2$(D$_2$O)$_2$pyz by using high pressure to drive the
+system through a structural and magnetic phase transition. Using neutron
+scattering, we show that the low pressure state, which hosts a two-dimensional
+square lattice with spin-wave excitations and a dominant exchange coupling of
+0.89 meV, transforms at high pressure into a one-dimensional spin-chain
+hallmarked by a spinon continuum and a reduced exchange interaction of 0.43
+meV. This direct microscopic observation of a magnetic dimensional crossover as
+a function of pressure opens up new possibilities for studying the evolution of
+fractionalised excitations in low dimensional quantum magnets and eventually
+pressure-controlled metal--insulator transitions.",1708.03586v1
+2017-08-27,Electronic and spin dynamics in the insulating iron pnictide NaFe$_{0.5}$Cu$_{0.5}$As,"NaFe$_{0.5}$Cu$_{0.5}$As represents a rare exception in the metallic iron
+pnictide family, in which a small insulating gap is opened. Based on
+first-principles study, we provide a comprehensive theoretical characterization
+of this insulating compound. The Fe$^{3+} $spin degree of freedom is quantified
+as a quasi-1D $S=\frac{5}{2}$ Heisenberg model. The itinerant As hole state is
+downfolded to a $p_{xy}$-orbital hopping model on a square lattice. A unique
+orbital-dependent Hund's coupling between the spin and the hole is revealed.
+Several important material properties are analyzed, including (a) factors
+affecting the small $p-d$ charge-transfer gap; (b) role of the extra interchain
+Fe; and (c) the quasi-1D spin excitation in the Fe chains. The experimental
+manifestations of these properties are discussed.",1708.08065v1
+2018-02-02,Can the quantum spin Hall state of silicene be preserved on substrate,"The substrate-induced topological phase transition of silience is a
+formidable obstacle for developing silicene-based materials and devices for
+compatibility with current electronics by using its topologically protected
+dissipationless edge states. First-principles calculations indicate that the
+substrate will result in a phase transition from topological nontrivial phase
+to trivial phase of silicene, although its Dirac cone is still obvious. The
+substrate effect (equivalent to an electric field) annihilates its spin-orbit
+coupling effect, the reason why its quantum spin Hall effect (QSHE) of silicene
+has not been experimentally observed. Unfortunately, external electric field
+seems impossible to recover the QSHE due to the screen effect of substrate. We
+here first propose a viable strategy (constructing inverse symmetrical sandwich
+structure (protective layer/silicene/substrate)) to preserve quantum spin Hall
+(QSH) state of silicene, which is demonstrated by using two representatives
+(CeO2(111)/silicene/CeO2(111) and CaF2(111)/silicene/CaF2(111)) through the
+calculated edge states and Z2 invariant. This work takes a critical step
+towards fundamental physics and realistic applications of silicene-based
+nanoelectronic devices.",1802.00591v1
+2020-07-02,Wave-particle duality of electrons with spin-momentum locking,"We investigate the effects of spin-momentum locking on the interference and
+diffraction patterns due to a double- or single-slit in an electronic
+\emph{Gedankenexperiment}. We show that the inclusion of the
+spin-degree-of-freedom, when coupled to the motion direction of the carrier --
+a typical situation that occurs in systems with spin-orbit interaction -- leads
+to a modification of the interference and diffraction patterns that depend on
+the geometrical parameters of the system.",2007.01021v3
+2020-07-03,Emergence of Intra-Particle Entanglement and Time-Varying Violation of Bell's Inequality in Dirac Matter,"We demonstrate the emergence and dynamics of intra-particle entanglement in
+massless Dirac fermions. This entanglement, generated by spin-orbit coupling,
+arises between the spin and sublattice pseudospin of electrons in graphene. The
+entanglement is a complex dynamic quantity but is generally large, independent
+of the initial state. Its time dependence implies a dynamical violation of a
+Bell inequality, while its magnitude indicates that large intra-particle
+entanglement is a general feature of graphene on a substrate. These features
+are also expected to impact entanglement between pairs of particles, and may be
+detectable in experiments that combine Cooper pair splitting with nonlocal
+measurements of spin-spin correlation in mesoscopic devices based on Dirac
+materials.",2007.01584v2
+2020-07-03,Dynamic spin-triplet order induced by alternating electric fields in superconductor-ferromagnet-superconductor Josephson junctions,"Dynamic states offer extended possibilities to control the properties of
+quantum matter. Recent efforts are focused on studying the ordered states which
+appear exclusively under the time-dependent drives. Here we demonstrate a class
+of systems which feature dynamic spin-triplet superconducting order stimulated
+by the alternating electric field. The effect is based on the interplay of
+ferromagnetism, interfacial spin-orbital coupling (SOC) and the condensate
+motion driven by the field, which converts hidden static p-wave order, produced
+by the joint action of the ferromagnetism and the SOC, into dynamical s-wave
+equal-spin triplet correlations. We demonstrate that the critical current of
+Josephson junctions hosting these states is proportional to the electromagnetic
+power, supplied either by the external irradiation or by the ac current source.
+Based on these unusual properties we propose the scheme of a Josephson
+transistor which can be switched by the ac voltage and demonstrates an
+even-numbered sequence of Shapiro steps. Combining the photo-active Josephson
+junctions with recently discovered Josephson phase batteries we find
+photo-magnetic SQUID devices which can generate spontaneous magnetic fields
+while being exposed to irradiation.",2007.01805v2
+2013-07-31,Relativistic symmetries in trigonometric Poschl-Teller potential plus tensor interaction,"The Dirac equation is solved to obtain its approximate bound states for a
+spin-1/2 particle in the presence of trigonometric Poschl-Teller (tPT)
+potential including a Coulomb-like tensor interaction with arbitrary spin-orbit
+quantum number $\kappa$ using an approximation scheme to substitute the
+centrifugal terms k(k+1)/r^2. In view of spin and pseudo-spin (p-spin)
+symmetries, the relativistic energy eigenvalues and the corresponding
+two-component wave functions of a particle moving in the field of attractive
+and repulsive tPT potentials are obtained using the asymptotic iteration method
+(AIM). We present numerical results in the absence and presence of tensor
+coupling $A$ and for various values of spin and p-spin constants and quantum
+numbers n and k. The non-relativistic limit is also obtained.",1308.0008v1
+2013-08-15,Magnetic order in pyrochlore iridate Nd$_2$Ir$_2$O$_7$ probed by muon spin relaxation,"Muon-spin relaxation results on the pyrochlore iridate Nd$_2$Ir$_2$O$_7$ are
+reported. Spontaneous coherent muon-spin precession below the metal-insulator
+transition (MIT) temperature of about 33 K is observed, indicating the
+appearance of a long-ranged magnetic ordering of Ir$^{4+}$ moments. With
+further decrease in temperature, the internal field at the muon site increases
+again below about 9 K. The second increase of internal field suggests the
+ordering of Nd$^{3+}$ moments, which is consistent with a previous neutron
+experiment. Our results suggest that the MIT and magnetic ordering of Ir$^{4+}$
+moments have a close relationship and that the large spin-orbit coupling of Ir
+5\textit{d} electrons plays a key role for both MIT and the mechanism of the
+magnetic ordering in pyrochlore iridates in the insulting ground state.",1308.3283v1
+2017-01-13,Proximity induced spin-valley polarization in silicene/germanene on F-doped WS$_2$,"Silicene and germanene are key materials for the field of valleytronics.
+However, interaction with the substrate, which is necessary to support the
+electronically active medium, becomes a major obstacle. In the present work, we
+propose a substrate (F-doped WS$_2$) that avoids detrimental effects and at the
+same time induces the required valley polarization, so that no further steps
+are needed for this purpose. The behavior is explained by proximity effects on
+silicene/germanene, as demonstrated by first-principles calculations. Broken
+inversion symmetry due to the presence of WS$_2$ opens a substantial band gap
+in silicene/germanene. F doping of WS$_2$ results in spin polarization, which,
+in conjunction with proximity-enhanced spin orbit coupling, creates sizable
+spin-valley polarization.",1701.03667v1
+2017-01-26,Antiferromagnetic textures and dynamics on the surface of a heavy metal,"We investigate the formation and dynamics of spin textures in
+antiferromagnetic insulators adjacent to a heavy-metal substrate with strong
+spin-orbit interactions. Exchange coupling to conduction electrons engenders an
+effective anisotropy, Dzyaloshinskii-Moriya interactions, and a magnetoelectric
+effect for the N\'{e}el order, which can conspire to produce nontrivial
+antiferromagnetic textures. Current-driven spin transfer enabled by the heavy
+metal, furthermore, triggers ultrafast (THz) oscillations of the N\'{e}el order
+for dc currents exceeding a critical threshold, opening up the possibility of
+Terahertz spin-torque self-oscillators. For a commonly invoked
+antidamping-torque geometry, however, the instability current scales with the
+energy gap of the antiferromagnetic insulator and, therefore, may be
+challenging to reach experimentally. We propose an alternative generic geometry
+for inducing ultrafast autonomous antiferromagnetic dynamics.",1701.07863v2
+2017-01-29,Signatures of interaction-induced helical gaps in nanowire quantum point contacts,"Spin-momentum locking in a semiconductor device with strong spin-orbit
+coupling (SOC) is a fundamental goal of nanoscale spintronics and an important
+prerequisite for the formation of Majorana bound states. Such a helical state
+is predicted in one-dimensional (1D) nanowires subject to strong Rashba SOC and
+spin-mixing, its hallmark being a characteristic reentrant behaviour in the
+conductance. Here, we report the first direct experimental observations of the
+reentrant conductance feature, which reveals the formation of a helical liquid,
+in the lowest 1D subband of an InAs nanowire. Surprisingly, the feature is very
+prominent also in the absence of magnetic fields. This behaviour suggests that
+exchange interaction exhibits substantial impact on transport in our device. We
+attribute the opening of the pseudogap to spin-flipping two-particle
+backscattering. The all-electric origin of the ideal helical transport bears
+momentous implications for topological quantum computing.",1701.08439v1
+2017-01-31,Dirac nodal lines and induced spin Hall effect in metallic rutile oxides,"We have found Dirac nodal lines (DNLs) in the band structures of metallic
+rutile oxides IrO$_2$, OsO$_2$, and RuO$_2$ and revealed a large spin Hall
+conductivity contributed by these nodal lines, which explains a strong spin
+Hall effect (SHE) of IrO$_2$ discovered recently. Two types of DNLs exist. The
+first type forms DNL networks that extend in the whole Brillouin zone and
+appears only in the absence of spin-orbit coupling (SOC), which induces surface
+states on the boundary. Because of SOC-induced band anti-crossing, a large
+intrinsic SHE can be realized in these compounds. The second type appears at
+the Brillouin zone edges and is stable against SOC because of the protection of
+nonsymmorphic symmetry. Besides reporting new DNL materials, our work reveals
+the general relationship between DNLs and the SHE, indicating a way to apply
+Dirac nodal materials for spintronics.",1701.09089v1
+2018-05-10,Current-Modulated Magnetoplasmonic Devices,"We model the operation and readout sensitivity of two current-modulated
+magnetoplasmonic devices which exploit spin Hall effect-like behavior as a
+function of their device and material parameters. In both devices, current
+pulses are applied to an electrically-isolated stack, containing an active
+layer (either a metal with large spin orbit coupling or a topological
+insulator) embedded within a plasmonic metal (Au). The first device, composed
+of a ferromagnet and the active layer, illustrates a plasmonic readout scheme
+for detecting magnetic reorientation driven by current-induced spin transfer
+torques. The plasmonic readout of these current-modulated non-volatile states
+may facilitate the development of plasmon-based memory or logic devices. The
+second device, containing only the active layer, explores the magnetoplasmonic
+readout conditions required to directly measure the spin accumulation in these
+materials. The estimated thickness-dependent sensitivity agrees with recent
+experimental magneto-optical Kerr effect observations.",1805.03926v1
+2009-12-23,Current-induced torques in continuous antiferromagnetic textures,"We study the influence of an electric current on a continuous non-collinear
+antiferromagnetic texture. Despite the lack of a net magnetic moment we find
+that the exchange interaction between conduction electrons and local
+magnetization generally results in current-induced torques that are similar in
+phenomenology to spin transfer torques in ferromagnets. We present the
+generalization of the non-linear sigma model equation of motion for the
+N\'{e}\`{e}l vector that includes these current-induced torques, and briefly
+discuss the resulting current-induced antiferromagnetic domain wall motion and
+spin-wave Doppler shift. We give an interpretation of our results using a
+unifying picture of current-induced torques in ferromagnets and
+antiferromagnets in which they are viewed as due to the current-induced spin
+polarization resulting from an effective spin-orbit coupling.",0912.4519v1
+2011-11-16,Interaction correction to the conductivity of two-dimensional electron gas in In$_x$Ga$_{1-x}$As/InP quantum well structure with strong spin-orbit coupling,"The electron-electron interaction quantum correction to the conductivity of
+the gated single quantum well InP/In$_{0.53}$Ga$_{0.47}$As heterostructures is
+investigated experimentally. The analysis of the temperature and magnetic field
+dependences of the conductivity tensor allows us to obtain reliably the
+diffusion part of the interaction correction for different values of spin
+relaxation rate, $1/\tau_s$. The surprising result is that the spin relaxation
+processes do not suppress the interaction correction in the triplet channel
+and, thus, do not enhance the correction in magnitude contrary to theoretical
+expectations even in the case of relatively fast spin relaxation,
+$1/T\tau_s\simeq (20-25)\gg 1$.",1111.3767v1
+2011-11-16,Quantum phase transitions in the Kane-Mele-Hubbard model,"We study the two-dimensional Kane-Mele-Hubbard model at half filling by means
+of quantum Monte Carlo simulations. We present a refined phase boundary for the
+quantum spin liquid. The topological insulator at finite Hubbard interaction
+strength is adiabatically connected to the groundstate of the Kane-Mele model.
+In the presence of spin-orbit coupling, magnetic order at large Hubbard U is
+restricted to the transverse direction. The transition from the topological
+band insulator to the antiferromagnetic Mott insulator is in the universality
+class of the three-dimensional XY model. The numerical data suggest that the
+spin liquid to topological insulator and spin liquid to Mott insulator
+transitions are both continuous.",1111.3949v2
+2014-05-19,Quantum Spin Hall Effect in Strip of Stripes Model,"We consider quantum spin Hall effect in an anisotropic strip of stripes and
+address both integer and fractional filling factors. The first model is based
+on a gradient of spin-orbit interaction in the direction perpendicular to the
+stripes. The second model is based on two weakly coupled strips with reversed
+dispersion relations. We demonstrate that these systems host helical modes,
+modes in which opposite spins propagate in opposite directions. In the integer
+regime, the modes carry an elementary electron charge whereas in the fractional
+regime they carry fractional charges, and their excitations possess anyonic
+braiding statistics. These simple quasi-one-dimensional models can serve as a
+platform for understanding effects arising due to electron-electron
+correlations in topological insulators.",1405.4793v1
+2014-06-17,Renormalization of electron self-energies via their interaction with spin excitations: A first-principles investigation,"Access to magnetic excitation spectra of single atoms deposited on surfaces
+is nowadays possible by means of low-temperature inelastic scanning tunneling
+spectroscopy. We present a first-principles method for the calculation of
+inelastic tunneling spectra utilizing the Korringa-Kohn-Rostoker Green function
+method combined with time-dependent density functional theory and many-body
+perturbation theory. The key quantity is the electron self-energy describing
+the coupling of the electrons to the spin excitation within the adsorbate. By
+investigating Cr, Mn, Fe and Co adatoms on a Cu(111) substrate, we
+spin-characterize the spectra and demonstrate that their shapes are altered by
+the magnetization of the adatoms, of the tip and the orbital decay into vacuum.
+Our method also predicts spectral features more complex than the steps obtained
+by simpler models for the adsorbate (e.g., localized spin models).",1406.4195v1
+2017-06-27,"Intrinsic 2D ferromagnetism, quantum anomalous Hall conductivity, and fully-spin-polarized edge states of FeBr3 monolayer","It is of great interest to explore intrinsic two-dimensional ferromagnetism
+and seek better two-dimensional quantum anomalous Hall insulator materials.
+Here, we show that the FeBr$_3$ monolayer is an intrinsic two-dimensional
+ferromagnetic material whose Curie temperature is 140 K thanks to its strong
+spin exchange interaction and giant uniaxial magnetic anisotropy. Our phonon
+spectra and mechanical analysis indicate that the FeBr$_3$ monolayer is
+dynamically and mechanically stable. Our electronic structure calculation shows
+that there is one Dirac cone at K point in the Brillouin zone and the
+spin-orbit coupling opens a semiconductor gap of 33.5 meV. Further
+tight-binding analysis reveals that the Chern number is equivalent to 1 and
+there is a quantum anomalous Hall conductivity $\sigma _{xy} = e^2/h$, and the
+chiral edge states are fully spin-polarized when an edge is created.
+Furthermore, it is shown that the main results are not affected by electron
+correlation effects and biaxial strain. Therefore, this FeBr$_3$ monolayer as
+2D material would be useful for spintronic applications.",1706.08943v2
+2017-12-11,Prediction of a large-gap and switchable Kane-Mele quantum spin Hall insulator,"Fundamental research and technological applications of topological insulators
+are hindered by the rarity of materials exhibiting a robust topologically
+non-trivial phase, especially in two dimensions. Here, by means of extensive
+first-principles calculations, we propose a novel quantum spin Hall insulator
+with a sizeable band gap of $\sim$0.5 eV that is a monolayer of Jacutingaite, a
+naturally occurring layered mineral first discovered in 2008 in Brazil and
+recently synthesised. This system realises the paradigmatic Kane-Mele model for
+quantum spin Hall insulators in a potentially exfoliable two-dimensional
+monolayer, with helical edge states that are robust and that can be manipulated
+exploiting a unique strong interplay between spin-orbit coupling,
+crystal-symmetry breaking and dielectric response.",1712.03873v2
+2017-12-28,Helical liquid in carbon nanotubes wrapped with DNA molecules,"The measured electric resistance of carbon nanotubes wrapped with DNA
+molecules depends strongly on the spin of the injected electrons. Motivated by
+these experiments, we study the effect of helix-shaped potentials on the
+electronic spectrum of carbon nanotubes. We find that in combination with the
+curvature-induced spin-orbit coupling inherent to nanotubes, such a
+perturbation opens helicity-dependent gaps. Within these partial gaps,
+left-moving electrons carry a fixed spin-projection that is reversed for
+right-moving electrons, and the probability of electrons to transfer through
+the nanotube correlates with their helicity. We explain the origin of this
+effect and show that it can alternatively be induced by twisting the nanotube.
+Our findings suggest that carbon nanotubes hold great potential for
+implementing spin filters and may form an ideal platform to study the physical
+properties of one-dimensional helical liquids.",1712.09950v1
+2018-01-09,Unidirectional spin density wave state in metallic (Sr1-xLax)2IrO4,"Materials that exhibit both strong spin orbit coupling and electron
+correlation effects are predicted to host numerous new electronic states. One
+prominent example is the Jeff =1/2 Mott state in Sr2IrO4, where introducing
+carriers is predicted to manifest high temperature superconductivity analogous
+to the S=1/2 Mott state of La2CuO4. While bulk superconductivity currently
+remains elusive, anomalous quasi-particle behaviors paralleling those in the
+cuprates such as pseudogap formation and the formation of a d-wave gap are
+observed upon electron-doping Sr2IrO4. Here we establish a magnetic parallel
+between electron-doped Sr2IrO4 and hole-doped La2CuO4 by unveiling a spin
+density wave state in electron-doped Sr2IrO4. Our magnetic resonant x-ray
+scattering data reveal the presence of an incommensurate magnetic state
+reminiscent of the diagonal spin density wave state observed in the monolayer
+cuprate (La1-xSrx)2CuO4. This link supports the conjecture that the quenched
+Mott phases in electron-doped Sr2IrO4 and hole-doped La2CuO4 support common
+competing electronic phases.",1801.03076v1
+2018-01-14,Rashba-driven anomalous Nernst conductivity of lead chalcogenide films,"The presence of a finite Berry curvature $\left(\Omega\left(k\right)\right)$
+leads to anomalous thermal effects. In this letter, we compute the coefficients
+for the anomalous Nernst effect $\left(ANE\right) $ and its spin analogue, the
+spin Nernst effect $\left(SNE\right)$ in lead chalcogenide (\textit{PbX};
+\textit{X} = S, Se, Te) films. The narrow gapped \textit{PbX} films with a
+large spin-orbit coupling (\textit{soc}) offer a significant Rashba interaction
+that gives rise to $ \Omega\left(k\right) $ and the attendant anomalous thermal
+behaviour. In presence of a temperature gradient, the $ ANE $ and $ SNE $
+establish a thermal and spin current and are characterized by their respective
+coefficients which acquire higher values for a stronger Rashba interaction. We
+further show that an extrinsic \textit{soc} generated by an in-plane electric
+field offers a gate-like mechanism to control (and turn-off) the anomalous
+thermal currents. Finally, we conclude by deriving the efficiency of an $ ANE
+$-driven low-temperature Carnot heat engine and demonstrate that it can be
+gainfully optimized in systems with a robust intrinsic \textit{soc} resulting
+in low carrier effective masses.",1801.04516v2
+2018-09-03,Generating high-order optical and spin harmonics from ferromagnetic monolayers,"High-order harmonic generation (HHG) in solids has entered a new phase of
+intensive research, with envisioned band-structure mapping on an ultrashort
+time scale. This partly benefits from a flurry of new HHG materials discovered,
+but so far has missed an important group. HHG in magnetic materials should have
+profound impact on future magnetic storage technology advances. Here we
+introduce and demonstrate HHG in ferromagnetic monolayers. We find that HHG
+carries spin information and sensitively depends on the relativistic spin-orbit
+coupling; and if they are dispersed into the crystal momentum ${\bf k}$ space,
+harmonics originating from real transitions can be ${\bf k}$-resolved and carry
+the band structure information. Geometrically, the HHG signal is sensitive to
+spatial orientations of monolayers. Different from the optical counterpart, the
+spin HHG, though probably weak, only appears at even orders, a consequence of
+SU(2) symmetry. Our findings open an unexplored frontier -- magneto-high-order
+harmonic generation.",1809.00613v1
+2018-09-14,Visualizing entanglement in atoms and molecules,"In this work we show how constructing Wigner functions of heterogeneous
+quantum systems leads to new capability in the visualization of quantum states
+of atoms and molecules. This method allows us to display quantum correlations
+(entanglement) between spin and spatial degrees of freedom (spin-orbit
+coupling) and between spin degrees of freedom, as well as more complex
+combinations of spin and spatial entanglement for the first time. This is
+important as there is growing recognition that such properties affect the
+physical characteristics, and chemistry, of atoms and molecules. Our
+visualizations are sufficiently accessible that, with some preparation, those
+with a non-technical background can gain an appreciation of subtle quantum
+properties of atomic and other systems. By providing new insights and modelling
+capability, our phase-space representation will be of great utility in
+understanding aspects of atomic physics and chemistry not available with
+current techniques.",1809.05431v3
+2018-09-28,Helical Topological Edge States in a Quadrupole Phase,"Topological electric quadrupole is a recently proposed concept that extends
+the theory of electric polarization of crystals to higher orders. Such a
+quadrupole phase supports topological states localized on both edges and
+corners. In this work, we show that in a quadrupole phase of honeycomb lattice,
+topological helical edge states and pseudo-spin-polarized corner states appear
+by making use of a pseudo-spin degree of freedom related to point group
+symmetry. Furthermore, we argue that a general condition for emergence of
+helical edge states in a (pseudo-)spinful quadrupole phase is mirror or
+time-reversal symmetry. Our results offers a way of generating topological
+helical edge states without spin-orbital couplings.",1809.10824v2
+2019-09-19,Colloquium: Spintronics in graphene and other two-dimensional materials,"After the first unequivocal demonstration of spin transport in graphene
+(Tombros et al., 2007), surprisingly at room temperature, it was quickly
+realized that this novel material was relevant for both fundamental spintronics
+and future applications. Over the decade since, exciting results have made the
+field of graphene spintronics blossom, and a second generation of studies has
+extended to new two-dimensional (2D) compounds. This Colloquium reviews recent
+theoretical and experimental advances on electronic spin transport in graphene
+and related 2D materials, focusing on emergent phenomena in van der Waals
+heterostructures and the new perspectives provided by them. These phenomena
+include proximity-enabled spin-orbit effects, the coupling of electronic spin
+to light, electrical tunability, and 2D magnetism.",1909.09188v2
+2019-09-30,Spin-dependent refraction at the interface of lateral heterostructures of 2$H$-type transition-metal dichalcogenide monolayers,"We study the refraction effect of electronic wave in hole-doped lateral
+heterojunctions of metallic and semiconducting transition-metal dichalcogenide
+monolayers. This effect is theoretically investigated in 2$H$-type
+MoSe$_2$-NbS$_2$ and WSe$_2$-NbS$_2$ junctions by combining the
+first-principles calculation and the lattice Green's function method. We show
+that the electronic waves change the direction of motion at the interface and
+collimate the velocity along two different directions depending on the spin. We
+find that the transmission probability increases with the charge density and
+that the direction of refracted electron beams is close to $\pm30^\circ$ with
+respect to the perpendicular axis to the interface. The metallic
+transition-metal dichalcogenide is essential for the refraction effect because
+of the strong trigonal-warping effect, the large Fermi surface, and the
+Zeeman-type spin-orbit coupling. The refraction effect enables to generate the
+spin-polarized electronic current by using a simple fabrication of
+transition-metal dichalcogenide monolayers.",1909.13401v1
+2019-10-25,Twisted magnon as a magnetic tweezer,"Wave fields with spiral phase dislocations carrying orbital angular momentum
+(OAM) have been realized in many branches of physics, such as for photons,
+sound waves, electron beams, and neutrons. However, the OAM states of magnons
+(spin waves)$-$the building block of modern magnetism$-$and particularly their
+implications have yet to be addressed. Here, we theoretically investigate the
+twisted spin-wave generation and propagation in magnetic nanocylinders. The OAM
+nature of magnons is uncovered by showing that the spin-wave eigenmode is also
+the eigenstate of the OAM operator in the confined geometry. Inspired by
+optical tweezers, we predict an exotic ""magnetic tweezer"" effect by showing
+skyrmion gyrations under twisted magnons in exchange coupled
+nanocylinder$|$nanodisk heterostructure, as a practical demonstration of
+magnonic OAM to manipulate topological spin defects. Our study paves the way
+for the emerging magnetic manipulations by harnessing the OAM degree of freedom
+of magnons.",1910.11528v2
+2019-10-30,Synthesizing the Quantum Spin Hall Phase for Ultracold Atoms in Bichromatic Chiral Optical Ladders,"Realizing the topological bands of helical states poses a challenge in
+studying ultracold atomic gases. Motivated by the recent experimental success
+in realizing chiral optical ladders, here we present a scheme for synthesizing
+topological quantum matter, especially the quantum spin Hall phase, in the
+chiral optical ladders. More precisely, we first establish the synthetic
+pseudo-spin-orbit coupling and Zeeman splitting in the chiral ladders. We
+analyze the band structure of the ladders exposed to the bichromatic optical
+potentials and report the existence of quantum spin Hall phase. We further
+identify a rich phase diagram of the bichromatic chiral ladders, illustrating
+that our proposal features a large space of system parameters exhibiting a
+variety of quantum phase transitions. Our scheme can be readily implemented in
+the existing experimental systems and hence provides a new method to engineer
+the sophisticated topological bands for cold atomic gases.",1910.13663v1
+2020-02-12,Volkov-Pankratov states in topological superconductors,"We study the in-gap states that appear at the boundaries of both 1D and 2D
+topological superconductors. While the massless Majorana quasiparticles are
+guaranteed to arise by the bulk-edge correspondence, we find that they could be
+accompanied by massive Volkov-Pankratov (VP) states which are present only when
+the interface is sufficiently smooth. These predictions can be tested in an
+s-wave superconductor with Rashba spin-orbit coupling placed on top of a
+magnetic domain wall. We calculate the spin-resolved local density of states of
+the VP states about the band inversion generated by a magnetic domain wall and
+find that they are oppositely spin-polarized on either side of the topological
+phase boundary. We also demonstrate that the spatial position, energy-level
+spacing, and spin polarization of the VP states can be modified by the
+introduction of in-plane electric fields.",2002.05236v1
+2020-04-02,Spin-Dependent Charge-Carrier Recombination Processes in Tris(8-Hydroxyquinolinato) Aluminum,"We have studied the nature and dynamics of spin-dependent charge carrier
+recombination in Tris(8-hydroxyquinolinato) aluminum (Alq$_3$) films in light
+emitting diodes at room temperature using continuous wave and pulsed
+electrically detected magnetic resonance (EDMR) spectroscopy. We found that the
+EDMR signal is dominated by an electron-hole recombination process, and
+another, weaker EDMR signal whose fundamental nature was investigated. From the
+pulsed EDMR measurements we obtained a carrier spin relaxation time, $T_2 =
+45\pm 25$ ns which is much shorter than $T_2$ in conjugated polymers, but
+relatively long for a molecule containing elements with high atomic number.
+Using multi-frequency continuous wave EDMR spectroscopy, we obtained the local
+hyperfine field distributions for electrons and holes, as well as their
+respective spin-orbit coupling induced g-factor and g-strain values.",2004.00765v1
+2018-03-09,Experimental determination of exchange constants in antiferromagnetic Mn$_2$Au,"Mn$_2$Au is an important antiferromagnetic (AF) material for spintronics
+applications. Due to its very high N\'eel temperature of about 1500 K, some of
+the basic properties are difficult to explore, such as the AF susceptibility
+and the exchange constants. Experimental determination of these properties is
+further complicated in thin films by unavoidable presence of uncompensated and
+quasiloose spins on antisites and at interfaces. Using x-ray magnetic circular
+dichroism (XMCD), we have measured the spin and orbital contribution to the
+susceptibility in the direction perpendicular to the in-plane magnetic moments
+of a Mn$_2$Au(001) film and in fields up to 8 T. By performing these
+measurements at a low temperature of 7 K and at room temperature, we were able
+to separate the loose spin contribution from the susceptibility of AF coupled
+spins. The value of the AF exchange constant obtained with this method for a 10
+nm thick Mn$_2$Au(001) film equals to (24 $\pm$ 5) meV.",1803.03524v1
+2018-03-12,"Kramers degeneracy and relaxation in vanadium, niobium and tantalum clusters","In this work we use magnetic deflection of V, Nb, and Ta atomic clusters to
+measure their magnetic moments. While only a few of the clusters show weak
+magnetism, all odd-numbered clusters deflect due to the presence of a single
+unpaired electron. Surprisingly, for majority of V and Nb clusters an
+atomic-like behavior is found, which is a direct indication of the absence of
+spin-lattice interaction. This is in agreement with Kramers degeneracy theorem
+for systems with a half-integer spin. This purely quantum phenomenon is
+surprisingly observed for large systems of more than 20 atoms, and also
+indicates various quantum relaxation processes, via Raman two-phonon and Orbach
+high-spin mechanisms. In heavier, Ta clusters, the relaxation is always
+present, probably due to larger masses and thus lower phonon energies, as well
+as increased spin-orbit coupling.",1803.04320v1
+2018-08-08,High throughput screening for spin-gapless semiconductors in quaternary Heusler compounds,"Based on high throughput density functional theory calculations, we performed
+systematic screening for spin-gapless semiconductors (SGSs) in quaternary
+Heusler alloys XX 0 YZ (X, X 0 , and Y are transition metal elements without
+Tc, and Z is one of B, Al, Ga, In, Si, Ge, Sn, Pb, P, As, Sb, and Bi).
+Following the empirical rule, we focused on compounds with 21, 26, or 28
+valence electrons, resulting in 12, 000 possible chemical compositions. After
+systematically evaluating the thermodynamic, mechanical, and dynamical
+stabilities, we successfully identified 70 stable SGSs, confirmed by explicit
+electronic structure calculations with proper magnetic ground states. It is
+demonstrated that all four types of SGSs can be realized, defined based on the
+spin characters of the bands around the Fermi energy, and the type-II SGSs show
+promising transport properties for spintronic applications. The effect of
+spin-orbit coupling is investigated, resulting in large anisotropic
+magnetoresistance and anomalous Nernst effects.",1808.02684v1
+2018-08-09,Switchable and tunable Rashba-type spin splitting in covalent perovskite oxides,"In transition metal perovskites (ABO3) most physical properties are tunable
+by structural parameters such as the rotation of the BO6 octahedra. Examples
+include the N\'eel temperature of orthoferrites, the conductivity of
+mixed-valence manganites, or the band gap of rare-earth scandates. Since oxides
+often host large internal electric dipoles and can accommodate heavy elements,
+they also emerge as prime candidates to display Rashba spin-orbit coupling,
+through which charge and spin currents may be efficiently interconverted.
+However, despite a few experimental reports in SrTiO3-based interface systems,
+the Rashba interaction has been little studied in these materials, and its
+interplay with structural distortions remain unknown. In this Letter, we
+identify a bismuth-based perovskite with a giant, electrically-switchable
+Rashba interaction whose amplitude can be controlled by both the ferroelectric
+polarization and the breathing mode of oxygen octahedra. This particular
+structural parameter arises from the strongly covalent nature of the Bi-O
+bonds, reminiscent of the situation in perovskite nickelates. Our results not
+only provide novel strategies to craft agile spin-charge converters but also
+highlight the relevance of covalence as a powerful handle to design emerging
+properties in complex oxides.",1808.03123v1
+2019-01-03,Novel Chern insulators with half-metallic edge states,"The central target of spintronics research is to achieve flexible control of
+highly efficient and spin-polarized electronic currents. Based on
+first-principles calculations and k-p models, we demonstrate that Cu2S/MnSe
+heterostructures are a novel type of Chern insulators with half-metallic chiral
+edge states and a very high Fermi velocity (0.87 * 10^6 m/s). The full
+spin-polarization of the edge states is found to be robust against the tuning
+of the chemical potential. Unlike the mechanisms reported previously, this
+heterostructure has quadratic bands with a normal band order, that is, the
+p/d-like band is below the s-like band. Charge transfer between the Cu2S moiety
+and the substrate results in variation in the occupied bands, which together
+with spin-orbit coupling, triggers the appearance of the topological state in
+the system. These results imply that numerous ordinary semiconductors with
+normal band order may convert into Chern insulators with half-metallic chiral
+edge states through this mechanism, providing a strategy to find a rich variety
+of materials for dissipationless, 100% spin-polarized and high-speed spintronic
+devices.",1901.00629v1
+2019-03-18,Tunnel magnetoresistance of a supramolecular spin valve,"We theoretically study the transport properties of a supramolecular spin
+valve, consisting of a carbon nanotube with two attached magnetic molecules,
+weakly coupled to metallic contacts. The emphasis is put on analyzing the
+change of the system's transport properties with the application of an external
+magnetic field, which aligns the spins of the molecules. It is shown that
+magnetoresistive properties of the considered molecular junction, which are
+associated with changing the state of the molecules from superparamagnetic to
+the ferromagnetic one, strongly depend on the applied bias voltage and the
+position of the nanotube's orbital levels, which can be tuned by a gate
+voltage. A strong dependence on the transport regime is also found in the case
+of the spin polarization of the current flowing through the system. The
+mechanisms leading to those effects are explained by invoking appropriate
+molecular states responsible for transport. The analysis is done with aid of
+the real-time diagrammatic technique up to the second order of expansion with
+respect to tunneling processes.",1903.07326v1
+2019-03-20,Two-dimensional Weyl Half Semimetal and Tunable Quantum Anomalous Hall Effect in Monolayer PtCl$_{3}$,"We propose a new topological quantum state of matter---the two-dimensional
+(2D) Weyl half semimetal (WHS), which features 2D Weyl points at Fermi level
+belonging to a single spin channel, such that the low-energy electrons are
+described by fully spin-polarized 2D Weyl fermions. We predict its realization
+in the ground state of monolayer PtCl$_3$. We show that the material is a half
+metal with an in-plane magnetization, and its Fermi surface consists of a pair
+of fully spin-polarized Weyl points protected by a mirror symmetry, which are
+robust against spin-orbit coupling. Remarkably, we show that the WHS state is a
+critical state at the topological phase transition between two quantum
+anomalous Hall insulator phases with opposite Chern numbers, such that a
+switching between quantum anomalous Hall states can be readily achieved by
+rotating the magnetization direction. Our findings demonstrate that WHS offers
+new opportunity to control the chiral edge channels, which will be useful for
+designing new topological electronic devices.",1903.08373v1
+2019-04-02,Direct evidence for efficient ultrafast charge separation in epitaxial WS$_2$/graphene heterostructure,"We use time- and angle-resolved photoemission spectroscopy (tr-ARPES) to
+investigate ultrafast charge transfer in an epitaxial heterostructure made of
+monolayer WS$_2$ and graphene. This heterostructure combines the benefits of a
+direct gap semiconductor with strong spin-orbit coupling and strong
+light-matter interaction with those of a semimetal hosting massless carriers
+with extremely high mobility and long spin lifetimes. We find that, after
+photoexcitation at resonance to the A-exciton in WS$_2$, the photoexcited holes
+rapidly transfer into the graphene layer while the photoexcited electrons
+remain in the WS$_2$ layer. The resulting charge transfer state is found to
+have a lifetime of $\sim1$\,ps. We attribute our findings to differences in
+scattering phase space caused by the relative alignment of WS$_2$ and graphene
+bands as revealed by high resolution ARPES. In combination with spin-selective
+excitation using circularly polarized light the investigated WS$_2$/graphene
+heterostructure might provide a new platform for efficient optical spin
+injection into graphene.",1904.01379v1
+2019-08-20,Quasi-two-dimensional Fermi surfaces and unitary spin-triplet pairing in the heavy fermion superconductor UTe$_2$,"We report first-principles and strongly-correlated calculations of the
+newly-discovered heavy fermion superconductor UTe$_2$. Our analyses reveal
+three key aspects of its magnetic, electronic, and superconducting properties,
+that include: (1) a two-leg ladder-type structure with strong magnetic
+frustrations, which might explain the absence of long-range orders and the
+observed magnetic and transport anisotropy; (2) quasi-two-dimensional Fermi
+surfaces composed of two separate electron and hole cylinders with similar
+nesting properties as in UGe$_2$, which may potentially promote magnetic
+fluctuations and help to enhance the spin-triplet pairing; (3) a unitary
+spin-triplet pairing state of strong spin-orbit coupling at zero field, with
+point nodes presumably on the heavier hole Fermi surface along the
+$k_x$-direction, in contrast to the previous belief of non-unitary pairing. Our
+proposed scenario is in excellent agreement with latest thermal conductivity
+measurement and provides a basis for understanding the peculiar magnetic and
+superconducting properties of UTe$_2$.",1908.07396v1
+2019-12-20,All-Electrical Control of an Electron Spin/Valley Quantum Bit in SOI CMOS Technology,"We fabricated Quantum Dot (QD) devices using a standard SOI CMOS process
+flow, and demonstrated that the spin of confined electrons could be controlled
+via a local electrical-field excitation, owing to inter-valley spin-orbit
+coupling. We discuss that modulating the confinement geometry via an additional
+electrode may enable switching a quantum bit (qubit) between an
+electrically-addressable valley configuration and a protected spin
+configuration. This proposed scheme bears relevance to improve the trade-off
+between fast operations and slow decoherence for quantum computing on a Si
+qubit platform. Finally, we evoke the impact of process-induced variability on
+the operating bias range.",1912.11403v1
+2020-05-15,Off-axis dipole forces in optical tweezers by an optical analog of the {Magnus} effect,"It is shown that a circular dipole can deflect the focused laser beam that
+induces it, and will experience a corresponding transverse force. Quantitative
+expressions are derived for Gaussian and angular tophat beams, while the
+effects vanish in the plane-wave limit. The phenomena are analogous to the
+Magnus effect pushing a spinning ball onto a curved trajectory. The optical
+case originates in the coupling of spin and orbital angular momentum of the
+dipole and the light. In optical tweezers the force causes off-axis
+displacement of the trapping position of an atom by a spin-dependent amount up
+to $\lambda/2\pi$, set by the direction of a magnetic field. This suggests
+direct methods to demonstrate and explore these effects, for instance to induce
+spin-dependent motion.",2005.07790v3
+2020-11-06,Picosecond Switching of Optomagnetic Tunnel Junctions,"Perpendicular magnetic tunnel junctions are one of the building blocks for
+spintronic memories, which allow fast nonvolatile data access, offering
+substantial potentials to revolutionize the mainstream computing architecture.
+However, conventional switching mechanisms of such devices are fundamentally
+hindered by spin polarized currents4, either spin transfer torque or spin orbit
+torque with spin precession time limitation and excessive power dissipation.
+These physical constraints significantly stimulate the advancement of modern
+spintronics. Here, we report an optomagnetic tunnel junction using a
+spintronic-photonic combination. This composite device incorporates an
+all-optically switchable Co/Gd bilayer coupled to a CoFeB/MgO-based
+perpendicular magnetic tunnel junction by the Ruderman-Kittel-Kasuya-Yosida
+interaction. A picosecond all-optical operation of the optomagnetic tunnel
+junction is explicitly confirmed by time-resolved measurements. Moreover, the
+device shows a considerable tunnel magnetoresistance and thermal stability.
+This proof-of-concept device represents an essential step towards ultrafast
+spintronic memories with THz data access, as well as ultralow power
+consumption.",2011.03612v1
+2016-03-29,Optomechanical measurement of photon spin angular momentum and optical torque in integrated photonic devices,"Photons carry linear momentum, and spin angular momentum when circularly or
+elliptically polarized. During light-matter interaction, transfer of linear
+momentum leads to optical forces, while angular momentum transfer induces
+optical torque. Optical forces including radiation pressure and gradient forces
+have long been utilized in optical tweezers and laser cooling. In nanophotonic
+devices optical forces can be significantly enhanced, leading to unprecedented
+optomechanical effects in both classical and quantum regimes. In contrast, to
+date, the angular momentum of light and the optical torque effect remain
+unexplored in integrated photonics. Here, we demonstrate the measurement of the
+spin angular momentum of photons propagating in a birefringent waveguide and
+the use of optical torque to actuate rotational motion of an optomechanical
+device. We show that the sign and magnitude of the optical torque are
+determined by the photon polarization states that are synthesized on the chip.
+Our study reveals the mechanical effect of photon's polarization degree of
+freedom and demonstrates its control in integrated photonic devices. Exploiting
+optical torque and optomechanical interaction with photon angular momentum can
+lead to torsional cavity optomechanics and optomechanical photon spin-orbit
+coupling, as well as applications such as optomechanical gyroscope and
+torsional magnetometry.",1603.08950v1
+2016-10-03,NiCl3 Monolayer: Dirac Spin-Gapless Semiconductor and Chern Insulator,"The great obstacle for practical applications of the quantum anomalous Hall
+(QAH) effect is the lack of suitable QAH materials (Chern insulators) with
+large non-trivial band gap, room-temperature magnetic order and high carrier
+mobility. The Nickle chloride (NiCl3) monolayer characteristics are
+investigated herein using first-principles calculations. It is reported that
+NiCl3 monolayers constitute a new class of Dirac materials with Dirac
+spin-gapless semiconducting and high-temperature ferromagnetism (~400K). Taking
+into account the spin-orbit coupling, the NiCl3 monolayer becomes an intrinsic
+insulator with a large non-trivial band gap of ~24 meV, corresponding to an
+operating temperature as high as ~280K at which the quantum anomalous Hall
+effect could be observed. The calculated large non-trivial gap, high Curie
+temperature and single-spin Dirac states reported herein for the NiCl3
+monolayer lead us to propose that this material give a great promise for
+potential realization of a near-room temperature QAH effect and potential
+applications in spintronics. Last but not least the calculated Fermi velocities
+of Dirac fermion of about 4x105 m/s indicate very high mobility in NiCl3
+monolayers.",1610.00407v1
+2019-05-14,Anapole Correlations in Sr2IrO4 Defy the jeff = 1/2 Model,"Zel'dovich (spin) anapole correlations in Sr2IrO4 unveiled by magnetic
+neutron diffraction contravene the spin-orbit coupled ground state used by the
+jeff = 1/2 (pseudo-spin) model. Specifically, spin and space know inextricable
+knots which bind each to the other in the iridate. The diffraction property
+studied in the Letter is enforced by strict requirements from quantum mechanics
+and magnetic symmetry. It has not been exploited in the past, whereas neutron
+diffraction by anapole moments is established. Entanglement of the electronic
+degrees of freedom is captured by binary correlations of the anapole and
+position operators, and hallmarked in the diffraction amplitude by axial atomic
+multipoles with an even rank.",1905.05535v2
+2019-06-24,On the Exciton Fine-Structure of Transition-Metal Dichalcogenides Mono-Layers,"In order to discuss the exciton fine-structure of transition-metal
+dichalcogenides mono-layers, excitons are first defined in the subspace of
+electron- and hole states, including the lowest conduction band (LCB) and the
+uppermost valence band (UVB). Both bands are spin degenerate at the
+Gamma-point. All other states are neglected. The resulting exciton states are
+analyzed in the framework of an invariant expansion of a model Hamiltonian: The
+spin-orbit coupling in the conduction- and valence band is simulated by
+introducing a fictive magnetic field, giving rise to a splitting of the
+electron- and hole states outside the $\Gamma$-point. Then the electron-hole
+exchange-interaction is introduced into the exciton Hamiltonian. It is due to
+the fact that electron and hole are indistinguishable particles in the exciton
+problem. In D3h crystal symmetry this electron-hole exchange-interaction has
+two different contributions: While a first term accounts for an energy
+re-normalization of all exciton states, a second term does not influence the
+optical active (spin-singlet) states but affects only the optical inactive
+(spin-triplet) states, which become mixed in-between the different exciton
+series.",1906.09790v1
+2021-01-24,Magnetic gradient free two axis control of a valley spin qubit in SiGe,"Spins in SiGe quantum dots are promising candidates for quantum bits but are
+also challenging due to the valley degeneracy which could potentially cause
+spin decoherence and weak spin-orbital coupling. In this work we demonstrate
+that valley states can serve as an asset that enables two-axis control of a
+singlet-triplet qubit formed in a double quantum dot without the application of
+a magnetic field gradient. We measure the valley spectrum in each dot using
+magnetic field spectroscopy of Zeeman split triplet states. The interdot
+transition between ground states requires an electron to flip between valleys,
+which in turn provides a g-factor difference $\Delta g$ between two dots. This
+$\Delta g$ serves as an effective magnetic field gradient and allows for qubit
+rotations with a rate that increases linearly with an external magnetic field.
+We measured several interdot transitions and found that this valley introduced
+$\Delta g$ is universal and electrically tunable. This could potentially
+simplify scaling up quantum information processing in the SiGe platform by
+removing the requirement for magnetic field gradients which are difficult to
+engineer.",2101.09786v1
+2021-01-25,Antiferromagnetic State in $κ$-type Molecular Conductors: Spin Splitting and Mott Gap,"We numerically investigate the dynamical properties of $\kappa$-type
+molecular conductors in their antiferromagnetic Mott insulating state. By
+treating the extended Hubbard model on the two-dimensional $\kappa$-type
+lattice within the Lanzcos exact diagonalization method, we calculate the
+one-particle spectral function $A(\boldsymbol{k}, \omega)$ and the optical
+absorption spectra taking advantage of twisted boundary conditions. We find
+spin splitting in $A(\boldsymbol{k}, \omega)$ predicted by a previous
+Hartree-Fock study [M. Naka et al., Nat. Commun. 10, 4305 (2019)]; namely,
+their up- and down-spin components become different in the general
+$\boldsymbol{k}$-points of the Brillouin zone, even without the spin-orbit
+coupling. Furthermore, we demonstrate the variation in the optical properties
+near the Mott gap by the presence or absence of the antiferromagnetic order,
+tuned by a small staggered magnetic field.",2101.09883v2
+2021-02-03,Spin-flip pair-density functional theory: A practical approach to treat static and dynamical correlations in large molecules,"We present a practical approach to treat static and dynamical correlation
+accurately in large multi-configurational systems. The static correlation is
+accounted for using the spin-flip approach which is well known for capturing
+static correlation accurately at low-computational expense. Unlike previous
+approaches to add dynamical correlation to spin-flip models which use
+perturbation theory or coupled-cluster theory, we explore the ability to use
+the on-top pair-density functional theory approaches recently developed by
+Gagliardi and co-workers (JCTC, 10, 3669, 2014). External relaxations are
+carried out in the spin-flip calculations though a restricted active space
+framework for which a truncation scheme for the orbitals used in the external
+excitation is presented. The performance of the approach is demonstrated by
+computing energy gaps between ground and excited states for diradicals,
+triradicals and linear polyacene chains ranging from naphthalene to dodecacene.
+Accurate results are obtained using the new approach for these challenging
+open-shell molecular systems.",2102.02325v1
+2021-05-31,Field-Direction Sensitive Skyrmion Crystals in Cubic Chiral Systems: Implication to $4f$-Electron Compound EuPtSi,"We theoretically study the stability of magnetic skyrmion crystals (SkXs) in
+chiral cubic antiferromagnets with the EuPtSi hosting unconventional nanometric
+SkXs in mind. By performing numerical simulations for a minimal effective spin
+model with the long-range Dzyaloshinskii-Moriya interaction and the
+multiple-spin interaction arising from itinerant nature of electrons, we
+clarify two key ingredients for the emergence of the SkXs in EuPtSi: One is the
+low-symmetric ordering vectors that lead to the field-direction sensitive SkXs
+in an external magnetic field, while the other is the synergy between
+spin-charge and spin-orbit couplings in itinerant magnets that results in the
+nanometric SkXs. The present study will not only provide the microscopic
+mechanism of the SkXs in EuPtSi but also guide for a search of further
+materials hosting short-period SkXs.",2106.00113v1
+2021-07-13,Exploration of trivial and non-trivial electronic phases and of collinear and non-collinear magnetic phases in low-spin d$^5$ perovskites,"The $4d$ and $5d$ transition metal oxides have become important members of
+the emerging quantum materials family due to competition between onsite Coulomb
+repulsion ($U$) and spin-orbit coupling (SOC). Specifically, the systems with
+$d^5$ electronic configuration in an octahedral environment are found to be
+capable of posessing invariant semimetallic state and perturbations can lead to
+diverse magnetic phases. In this work, by formulating a multi-band Hubbard
+model and performing SOC tunable DFT+$U$ calculations on a prototype SrIrO$_3$
+and extending the analysis to other iso-structural and isovalent compounds, we
+present eight possible electronic and magnetic configurations in the $U$-SOC
+phase diagram that can be observed in the family of low-spin $d^5$ perovskites.
+They include the protected Dirac semimetal state, metal and insulator regimes,
+collinear and noncollinear spin ordering. The latter is explained through
+connecting hopping interactions to the rotation and tilting of the octahedra as
+observed in GdFeO$_3$. Presence of several soft phase boundaries makes the
+family of $d^5$ perovskites an ideal platform to study electronic and magnetic
+phase transitions under external stimuli.",2107.06016v2
+2021-07-23,Carrier-induced ferromagnetism in 2D magnetically-doped semiconductor structures,"We show theoretically that the magnetic ions, randomly distributed in a
+two-dimensional (2D) semiconductor system, can generate a ferromagnetic
+long-range order via the RKKY interaction. The main physical reason is the
+discrete (rather than continuous) symmetry of the 2D Ising model of the
+spin-spin interaction mediated by the spin-orbit coupling of 2D free carriers,
+which precludes the validity of the Mermin-Wagner theorem. Further, the
+analysis clearly illustrates the crucial role of the molecular field
+fluctuations as opposed to the mean field. The developed theoretical model
+describes the desired magnetization and phase-transition temperature $T_c$ in
+terms of a single parameter; namely, the chemical potential $\mu$. Our results
+highlight a path way to reach the highest possible $T_c$ in a given material as
+well as an opportunity to control the magnetic properties externally (e.g., via
+a gate bias). Numerical estimations show that magnetic impurities such as
+Mn$^{2+}$ with spins $S=5/2$ can realize ferromagnetism with $T_c$ close to
+room temperature.",2107.11377v1
+2021-08-12,Polarized neutron scattering studies of magnetic excitations in iron-selenide superconductor (Li$_{0.8}$Fe$_{0.2}$)ODFeSe ($T_c$ = 41 K),"We report polarized neutron scattering measurements of the low energy spin
+fluctuations of the iron-selenide superconductor Li$_{0.8}$Fe$_{0.2}$ODFeSe
+below and above its superconducting transition temperature $T_c=41$ K. Our
+experiments confirmed that the resonance mode near 21 meV is magnetic.
+Moreover, the spin excitations are essentially isotropic in spin space at
+5$\leq E\leq$ 29 meV in the superconducting and normal states. Our results
+suggest that the resonance mode in iron-based superconductors becomes isotropic
+when the influence of spin-orbit coupling and magnetic/nematic order is
+minimized, similar to those observed in cuprate superconductors.",2108.05832v1
+2021-09-02,Enhanced magnon spin current using the bosonic Klein paradox,"Efficient manipulation of magnons for information processing is a central
+topic in spintronics and magnonics. An outstanding challenge for long-distance
+spin transport with minimal dissipation is to overcome the relaxation of
+magnons and to amplify the spin current they carry. Here, we propose to amplify
+magnon currents based on the realization of the bosonic Klein paradox in
+magnetic nanostructures. This paradox involves the magnon's antiparticle, the
+antimagnon, of which the existence is usually precluded by magnetic
+instabilities as it is an excitation at negative energy. We show that, by
+appropriately tuning the effective dissipation through spin-orbit torques, both
+magnons and antimagnons are dynamically stabilized. As a result, we find that
+the reflection coefficient of incident magnons at an interface between two
+coupled magnets can become larger than one, thereby amplifying the reflected
+magnon current. Our findings can lead to magnon amplifier devices for
+spintronic applications. Furthermore, our findings yield a solid-state platform
+to study the relativistic behavior of bosonic particles, which is an
+outstanding challenge with fundamental particles.",2109.00865v3
+2021-09-07,Topologically protected one-dimensional electronic states in group IV two-dimensional Dirac materials,"In this report we give a brief introduction on the occurrence of
+topologically protected one-dimensional electronic states in group IV
+two-dimensional graphene-like materials. We discuss the effect of spin-orbit
+coupling on the electronic band structure and show that these materials are
+potential candidates to exhibit the quantum spin Hall effect. The quantum spin
+Hall effect is characterized by a gapped interior and metallic
+counter-propagating spin-polarized topologically protected edges states. We
+also elaborate on the electric-field induced formation of a hexagonal network
+of one-dimensional topologically protected electronic states in small-angle
+twisted bilayer graphene.",2109.03071v3
+2021-10-19,"Nematic, chiral and topological superconductivity in transition metal dichalcogenides","We introduce and study a realistic model for superconductivity in twisted
+bilayer WSe$_{2}$, where electron pairing arises from spin-valley fluctuations
+in the weak-coupling regime. Our model comprises both the full continuum model
+moir\'{e} bandstructure and a short-ranged repulsive interaction that accounts
+for the Coulomb interaction projected onto the localized Wannier orbitals. By
+calculating the spin-valley susceptibility, we identify a Fermi surface nesting
+feature near half-filling of the top-most moir\'{e} band, which induces
+significantly enhanced spin-valley fluctuations. We then analyze the dominant
+Kohn-Luttinger pairing instabilities due to these spin-valley fluctuations and
+show that the leading instability can induce nematic, chiral and topological
+superconductivity. As our findings are asymptotically exact for small
+interaction strengths, they provide a viable starting point for future studies
+of superconductivity in twisted transition metal dichalcogenide bilayers.",2110.10172v1
+2021-10-20,Nonlinear response induced by Ferromagnetism in a Noncentrosymmetric Kondo Lattice system,"Recently, nonlinear responses have been actively studied in both experiments
+and theory. Particularly interesting are inversion-symmetry broken systems,
+where an even-order nonlinear electrical conductivity can be nonzero, resulting
+in nonreciprocity. Second-order nonlinear conductivities attract much attention
+because of their sensitivity to detect inversion-symmetry breaking in materials
+and their functionalities. However, while the nonlinear response has been
+actively studied in noninteracting systems for a long time, the nonlinear
+response in strongly correlated materials is still poorly understood. This
+paper analyzes the nonlinear conductivity in a correlated noncentrosymmetric
+system, namely a Kondo lattice system with Rashba type spin-orbit coupling. We
+mainly focus on the ferromagnetic phase, in which the second-order nonlinear
+conductivity becomes finite. Remarkably, we find that the second-order
+conductivity becomes only finite perpendicular to the ferromagnetic
+magnetization and has a strong spin dependence; due to a gap at the Fermi
+energy for one spin direction, the linear and nonlinear conductivity is only
+finite for the ungapped spin direction. Finally, we analyze sign changes in the
+nonlinear conductivity, which can be explained by a combination of correlation
+effects and the energetic shift due to the occurring ferromagnetism.",2110.10496v1
+2021-11-14,Superconductivity in noncentrosymmetric NbReSi investigated by muon spin rotation and relaxation,"Noncentrosymmetric materials are promising paradigm to explore unconventional
+superconductivity. In particular, several Re containing noncentrosymmetric
+materials have attracted considerable attention due to a superconducting state
+with a broken time reversal symmetry. A comprehensive study on the
+superconducting ground state of NbReSi was investigated using magnetization,
+resistivity, and muon spin rotation/relaxation measurements. Zero field muon
+spectroscopy results showed the absence of any spontaneous magnetic field below
+the superconducting transition temperature, T$ _{c} $ = 6.29 K, indicating the
+preserved time-reversal symmetry. Transverse field muon spin rotation
+measurements confirms a s-wave nature of the sample with $\Delta(0)/k_{B}T_{c}
+$ = 1.726. This study urges further investigation on more noncentrosymmetric
+materials to elucidate the selective appearance of unconventional nature and
+unveil its dependence on antisymmetric spin-orbit coupling strength.",2111.07247v1
+2021-11-29,Element selective ultrafast magnetization dynamics of hybrid Stoner-Heisenberg magnets,"Stoner and Heisenberg excitations in magnetic materials are inherently
+different. The former involves an effective reduction of the exchange
+splitting, whereas the latter comprises excitation of spin-waves. In this work,
+we test the impact of these two excitations in the hybrid Stoner-Heisenberg
+system FePd. We present a microscopic picture of ultrafast demagnetization
+dynamics in this alloy, which represents both components of strong local
+exchange splitting in Fe, and induced polarization in Pd. We identify
+spin-orbit coupling and optical inter-site spin transfer as the two dominant
+factors for demagnetization at ultrashort timescales. By tuning the external
+laser pulse, the extrinsic inter-site spin transfer can be manipulated for site
+selective demagnetization on femtosecond time scales providing the fastest way
+for optical and selective control of the magnetization dynamics in alloys.
+Remarkably, the drastic difference in origin of the magnetic moment of the Fe
+and Pd species is not deciding the initial magnetization dynamics in this
+alloy.",2111.14607v1
+2021-12-20,Bad topological semimetals in layered honeycomb compounds,"The Mott transition in honeycomb compounds with significant spin-orbit
+coupling is explored. At finite temperatures we identify a novel semimetallic
+phase located between a topological insulator and a topological Mott insulator.
+This semimetal is characterized by having no charge gap, no quasiparticles and
+gapped spin excitations with non-trivial topological properties. While charge
+conduction is incoherent involving mean-free paths violating the
+Mott-Ioffe-Regel limit, spin excitations can be transported ballistically along
+the edges giving rise to a quantized spin conductance. Such bad topological
+semimetal could be searched for close to the Mott transition in certain twisted
+bilayers of transition metal dicalchogenides.",2112.10455v2
+2022-02-21,Lorentz-covariant kinetic theory for massive spin-1/2 particles,"We construct a matrix-valued spin-dependent distribution function (MVSD) for
+massive spin-1/2 fermions and study its properties under Lorentz
+transformations. Such transformations result in a Wigner rotation in spin space
+and in a nontrivial matrix-valued shift in space-time, which corresponds to the
+side jump in the massless case. We express the vector and axial-vector
+components of the Wigner function in terms of the MVSD and show that they
+transform in a Lorentz-covariant manner. We then construct a manifestly
+Lorentz-covariant Boltzmann equation which contains a nonlocal collision term
+encoding spin-orbit coupling. Finally, we obtain the spin-dependent
+distribution function in local equilibrium by demanding detailed balance.",2202.10160v2
+2022-04-07,Superconductivity in multiorbital systems with repulsive interactions: Hund's pairing vs. spin-fluctuation pairing,"Hund's pairing refers to Cooper pairing generated by onsite interactions that
+become attractive due to large Hund's exchange $J$. This is possible in
+multiorbital systems even when all local bare interactions are repulsive, since
+attraction in specific channels are given by certain linear combinations of
+interaction parameters. On the other hand, pairing processes such as the
+exchange of spin fluctuations, are also present. We compare these two
+mechanisms on an equal footing using electronic bands appropriate for different
+classes of multiorbital systems over a wide range of interaction parameters. We
+find that for systems without clear nesting features, the superconducting state
+generated by the Hund's mechanism agrees well with that from the full
+fluctuation exchange vertex when Hund's exchange and spin-orbit coupling are
+sufficiently large. On the other hand, for systems characterized by a peaked
+finite-momentum particle-hole susceptibility, spin-fluctuation pairing
+generally dominates over Hund's pairing. We conclude that Hund's pairing states
+are unlikely to be realized in systems like Sr$_2$RuO$_4$ and generic
+iron-based superconductors.",2204.03496v2
+2022-04-15,Spin Conductivity Based on Magnetic Toroidal Quadrupole Hidden in Antiferromagnets,"We report our theoretical results on spin conductivity in antiferromagnets by
+focusing on the role of the magnetic toroidal quadrupole (MTQ) in electron
+systems. The MTQ is characterized as a time-reversal-odd rank-2 polar tensor
+degree of freedom in electrons, which is distinct from conventional rank-1
+magnetic and magnetic toroidal dipoles. Based on a microscopic $sd$ model
+analysis for a tetragonal system under both collinear and noncollinear
+antiferromagnetic orderings, we clarify that the MTQ becomes a source of an
+extrinsic spin conductivity even with neither a uniform magnetization nor
+spin-orbit coupling. We also list all the magnetic point groups to accommodate
+the MTQs as a primary order parameter as well as the candidate
+antiferromagnetic materials.",2204.07326v1
+2022-06-13,Recent advances of defect-induced spin and valley polarized states in graphene,"Electrons in graphene have fourfold spin and valley degeneracies owing to the
+unique bipartite honeycomb lattice and an extremely weak spin-orbit coupling,
+which can support a series of broken symmetry states. Atomic-scale defects in
+graphene are expected to lift these degenerate degrees of freedom at the
+nanoscale, and hence, lead to rich quantum states, highlighting promising
+directions for spintronics and valleytronics. In this article, we mainly review
+the recent scanning tunneling microscopy (STM) advances on the spin and/or
+valley polarized states induced by an individual atomic-scale defect in
+graphene, including a single-carbon vacancy, a nitrogen-atom dopant, and a
+hydrogen-atom chemisorption. Lastly, we give a perspective in this field.",2206.05936v1
+2022-06-15,Giant Rashba electrical control of magnetism in band models,"It is of considerable technological importance to achieve an electrical
+control of magnetism of sufficient magnitude. To overcome the in-plane shape
+anisotropy, needed is the electrical control of a perpendicular magnetic
+anisotropy (PMA). It is known, within a free electron model, the Rashba
+spin-orbit coupling provides such a control. Surprisingly, this same Rashba PMA
+is enhanced by two to three orders of magnitude when a periodic potential is
+added. Usually spin Berry phase physics reflects time dependent magnetic
+fields. Here it is shown, within a time independent model, such physics arises
+because the Rashba effective magnetic field has texture within the unit cell.
+Predicted are electrical controllable band-structure gaps, linear in the
+applied electric field $E$, that can result in a truly giant linear PMA. Also
+possible is a Peierls mechanism, in which the magnetisation tilts from the
+vertical, shifting these gaps to the Fermi level. As a consequence there are
+low dissipation electric field driven dynamics, an alternative to the more
+dissipative spin torque transfer (STT) effect. The theory requires the
+introduction of an intrinsic spin Berry connection $\vec A_s$, an effective
+vector potential, and is incompatible with current density functional theories
+(DFT).",2206.07399v1
+2022-07-08,Two-dimensional anisotropic Dirac materials PtN4C2 and Pt2N8C6 with quantum spin and valley Hall effects,"We propose two novel two-dimensional topological Dirac materials, planar
+PtN4C2 and Pt2N8C6, which exhibit graphene-like electronic structures with
+linearly dispersive Dirac-cone states exactly at the Fermi level. Moreover, the
+Dirac cone is anisotropic, resulting in anisotropic Fermi velocities and making
+it possible to realize orientation-dependent quantum devices. Using the
+first-principles electronic structure calculations, we have systemically
+studied the structural, electronic, and topological properties. We find that
+spin-orbit coupling opens a sizable topological band gap so that the materials
+can be classified as quantum spin Hall insulators as well as quantum valley
+Hall insulators. Helical edge states that reside in the insulating band gap
+connecting the bulk conduction and valence bands are observed. Our work not
+only expands the Dirac cone material family, but also provides a new avenue to
+searching for more two-dimensional topological quantum spin and valley Hall
+insulators.",2207.03703v1
+2022-08-09,Modelling of planar germanium hole qubits in electric and magnetic fields,"Hole-based spin qubits in strained planar germanium quantum wells have
+received considerable attention due to their favourable properties and
+remarkable experimental progress. The sizeable spin-orbit interaction in this
+structure allows for efficient electric qubit operations. However, it also
+couples the qubit to electrical noise. In this work we perform simulations of a
+heterostructure hosting these hole spin qubits. We solve the effective mass
+equations for a realistic heterostructure, provide a set of analytical basis
+wave functions, and compute the effective g-factor of the heavy-hole
+ground-state. Our investigations reveal a strong impact of highly excited light
+hole states located outside the quantum well on the g-factor. Consequently,
+contrary to recent predictions, we find that sweet spots in out-of-plane
+magnetic fields are shifted to impractically large electric fields. However,
+for magnetic fields close to in-plane alignment, sweet spots at low electric
+fields are recovered. This work will be helpful in understanding and improving
+coherence of germanium hole spin qubits.",2208.04795v1
+2023-02-16,Nodeless superconductivity in the noncentrosymmetric ThIrSi compound,"The ThIrSi superconductor, with $T_c = 6.5$ K, is expected to show unusual
+features in view of its noncentrosymmetric structure and the presence of heavy
+elements featuring a sizable spin-orbit coupling. Here, we report a
+comprehensive study of its electronic properties by means of local-probe
+techniques: muon-spin rotation and relaxation ({\textmu}SR) and nuclear
+magnetic resonance (NMR). Both the superfluid density $\rho_\mathrm{sc}(T)$
+(determined via transverse-field {\textmu}SR) and the spin-lattice relaxation
+rate $T_1^{-1}(T)$ (determined via NMR) suggest a nodeless superconductivity.
+Furthermore, the absence of spontaneous magnetic fields below $T_c$, as evinced
+from zero-field {\textmu}SR measurements, indicates a preserved time-reversal
+symmetry in the superconducting state of ThIrSi. Temperature-dependent upper
+critical fields as well as field-dependent superconducting muon-spin
+relaxations suggest the presence of multiple superconducting gaps in ThIrSi.",2302.08075v1
+2023-03-21,Controllable spin splitting in 2D Ferroelectric few-layer ${$γ}$-GeSe,"${\gamma}$-GeSe is a new type of layered bulk material that was recently
+successfully synthesized. By means of density functional theory
+first-principles calculations, we systematically studied the physical
+properties of two-dimensional (2D) few-layer ${\gamma}$-GeSe. It is found that
+few-layer ${\gamma}$-GeSe are semiconductors with band gaps decreasing with
+increasing layer number; and 2D ${\gamma}$-GeSe with layer number $n \geq 2$
+are ferroelectric with rather low transition barriers, consistent with the
+sliding ferroelectric mechanism. Particularly, spin-orbit coupling induced spin
+splitting is observed at the top of the valence band, which can be switched by
+the ferroelectric reversal; furthermore, their negative piezoelectricity also
+enables the regulation of spin splitting by strain. Finally, excellent optical
+absorption was also revealed. These intriguing properties make 2D few-layer
+${\gamma}$-GeSe promising in spintronic and optoelectric applications.",2303.11667v2
+2023-03-24,Symmetry manipulation of nonlinear optical effect for metallic TMDC,"Nonlinear optical (NLO) effect plays a crucial role to engineer optical
+angular frequency and symmetry of electronic system. Metallic transition-metal
+dichalcogenide (TMDC) is one of two-dimensional (2D) materials, which has no
+inversion symmetry for odd-number-layer. In particular, odd-number-layered
+NbSe$_2$ has spin splitting owing to Ising-type spin-orbit coupling. In this
+paper, we numerically calculate the NLO charge and spin conductivities of
+NbSe$_2$ based on an effective tight-binding model for several different
+optical effects, i.e., symmetry manipulation by bi-circular light (BCL) and
+bulk photovoltaic effect (shift and injection current). Under irradiation of
+BCL which can control the symmetry of electronic system, the current can be
+generated even in even-number-layered NbSe$_2$. Also, we find that shift
+current can be generated for odd-number-layered NbSe$_2$, which is robust
+against electronic scattering, i.e., topological current. The direction of
+generated shift current can be switched by altering polarization of light. Our
+results will serve to design opt-spintronics devices based on 2D materials to
+manipulate the charge and spin current and their directions by controlling the
+polarization of incident light which recasts the symmetry of electronic system.",2303.13768v1
+2023-05-18,Observation and enhancement of room temperature bilinear magnetoelectric resistance in sputtered topological semimetal Pt3Sn,"Topological semimetal materials have become a research hotspot due to their
+intrinsic strong spin-orbit coupling which leads to large charge-to-spin
+conversion efficiency and novel transport behaviors. In this work, we have
+observed a bilinear magnetoelectric resistance (BMER) of up to 0.1 nm2A-1Oe-1
+in a singlelayer of sputtered semimetal Pt3Sn at room temperature. Different
+from previous observations, the value of BMER in sputtered Pt3Sn does not
+change out-of-plane due to the polycrystalline nature of Pt3Sn. The observation
+of BMER provides strong evidence of the existence of spin-momentum locking in
+the sputtered polycrystalline Pt3Sn. By adding an adjacent CoFeB magnetic
+layer, the BMER value of this bilayer system is doubled compared to the single
+Pt3Sn layer. This work broadens the material system in BMER study, which paves
+the way for the characterization of topological states and applications for
+spin memory and logic devices.",2305.10720v2
+2023-05-25,Crystallization dynamics of magnetic skyrmions in a frustrated itinerant magnet,"We investigate the phase ordering kinetics of skyrmion lattice (SkL) in a
+metallic magnet. The SkL can be viewed as a superposition of magnetic stripes
+whose periods are determined by the quasi-nesting wave vectors of the
+underlying Fermi surface. An effective magnetic Hamiltonian that describes the
+electron-mediated spin-spin interaction is obtained for a two-dimensional s-d
+model with the Rashba spin-orbit coupling. Large-scale Landau-Lifshitz-Gilbert
+dynamics simulations based on the effective spin Hamiltonian reveal a two-stage
+phase ordering of the SkL phase after a thermal quench. The initial fast
+crystallization of skyrmions is followed by a slow relaxation dominated by the
+annihilation dynamics of dislocations, which are topological defects of the
+constituent magnetic stripe orders. The late-stage phase ordering also exhibits
+a dynamical scaling symmetry. We further show that the annihilation of
+dislocations follows a power-law time dependence with a logarithmic correction
+that depends on magnetic fields. Implications of our results for SkL phases in
+magnetic materials are also discussed.",2305.16182v1
+2023-06-15,First-Principles Study of Large Gyrotropy in MnBi for Infrared Thermal Photonics,"Nonreciprocal gyrotropic materials have attracted significant interest
+recently in material physics, nanophotonics, and topological physics. Most of
+the well-known nonreciprocal materials, however, only show nonreciprocity under
+a strong external magnetic field and within a small segment of the
+electromagnetic spectrum. Here, through first-principles density functional
+theory calculations, we show that due to strong spin-orbit coupling
+manganese-bismuth (MnBi) exhibits nonreciprocity without any external magnetic
+field and a large gyrotropy in a broadband long-wavelength infrared regime
+(LWIR). Further, we design a multi-layer structure based on MnBi to obtain a
+maximum degree of spin-polarized thermal emission at 7 $\mu$m. The connection
+established here between large gyrotropy and the spin-polarized thermal
+emission points to a potential use of MnBi to develop spin-controlled thermal
+photonics platforms.",2306.09233v1
+2023-06-29,$γ$-ray Angular Distributions in Single Nucleon Transfer Reactions with Exotic Strontium Isotopes,"$\gamma$-ray angular distributions help assign spin and parity to excited
+energy levels in nuclei. The spectroscopy of $^{94,96}$Sr studied through the
+single neutron transfer reactions with $^{95}$Sr beam in inverse kinematics
+[$^{95}$Sr(d,p)$^{96}$Sr; $^{95}$Sr(d,t)$^{94}$Sr] revealed a rich nuclear
+structure with many excited states. While the spin-parities were assigned to
+low lying states through techniques like particle angular distributions and
+angular momentum transfer, those for higher lying states were ambiguous. The
+goal of this project is to develop the Gamma-ray angular distributions and
+correlations techniques to assign spin-parity to these states. In this work,
+the $\gamma$-ray angular distributions for 815 keV transition from the first
+excited state to ground state $(2^{+} \rightarrow 0^{+})$ in $^{96}$Sr are
+measured. The alignment of this state is calculated from these measurements and
+compared to the theoretically calculated alignment for this state which is
+determined by coupling the spins of reactants and the orbital angular momentum
+transfered. The values agree within experimental limits justifying the
+technique. It is then applied to some other transitions and important results
+are discussed. Angular correlations cannot be performed with this data since
+statistics turn out to be limiting factor at the crystal level.",2306.17048v1
+2023-07-23,Ru doping induced spin frustration and enhancement of the room-temperature anomalous Hall effect in La2/3Sr1/3MnO3 films,"In transition-metal-oxide heterostructures, the anomalous Hall effect (AHE)
+is a powerful tool for detecting the magnetic state and revealing intriguing
+interfacial magnetic orderings. However, achieving a larger AHE at room
+temperature in oxide heterostructures is still challenging due to the dilemma
+of mutually strong spin-orbit coupling and magnetic exchange interactions.
+Here, we exploit the Ru doping-enhanced AHE in LSMRO epitaxial films. As the
+B-site Ru doping level increases up to 20 percent, the anomalous Hall
+resistivity at room temperature can be enhanced from nOhmcm to uOhmcm scale. Ru
+doping leads to strong competition between ferromagnetic double-exchange
+interaction and antiferromagnetic super-exchange interaction. The resultant
+spin frustration and spin-glass state facilitate a strong skew-scattering
+process, thus significantly enhancing the extrinsic AHE. Our findings could
+pave a feasible approach for boosting the controllability and reliability of
+oxide-based spintronic devices.",2307.12253v1
+2023-07-24,Enhanced Magnetism and Phase Transitions in Ultrathin Quantum Spin Liquid Na2IrO3 Flakes,"The quest for quantum spin liquids has garnered significant attention due to
+their rich physics and disruptive prospects in quantum communication and
+computation. Spin-orbit coupling, electron correlation, and structural
+distortion play critical roles in the candidate materials that eventually order
+antiferromagnetically at low temperatures. We introduce quantum electron
+confinement to the existing complexity and explore the interplay between
+Heisenberg and Kitaev interactions in ultrathin \ce{Na2IrO3} layers using
+first-principles calculations. The zigzag antiferromagnetic state in the
+monolayer is reinforced and pushed further away from the Kitaev spin liquid
+state due to the increased strength of Heisenberg and off-diagonal exchange
+interactions. In contrast, the carrier-doped flakes undergo a Mott
+insulator-to-metal transition accompanied by an antiferromagnetic to
+ferromagnetic transition. These findings present exciting prospects for
+comprehending magnetism in a novel two-dimensional framework of non-van der
+Waals correlated oxide flakes.",2307.12554v1
+2023-08-07,Frustration relief and reorientation transition in the kagome-like dolerophanite Cu$_2$OSO$_4$,"We present a theoretical study of dolerophanite Cu$_2$OSO$_4$, a layered
+kagome-like spin-$\frac{1}{2}$ magnetic insulator that can be described either
+as a system of chains coupled through dimers or as a kagome lattice where every
+third spin is replaced by a ferromagnetic spin dimer. Building on insights from
+ab initio calculations, classical numerical minimizations, and semiclassical
+expansions, we arrive at a minimal microscopic description that accounts for
+the experimental data reported so far, including the nature of the magnetic
+order, the reported spin length, and the observed anisotropy. The latter arises
+by a peculiar competition between the antisymmetric (Dzyaloshinskii-Moriya) and
+the symmetric part of the exchange anisotropy, which gives rise to a two-step
+re-orientation process involving two successive continuous phase transitions.
+Our work uncovers mechanisms stabilizing canted ferrimagnetic order in kagome
+systems, and highlights strong magnetic anisotropy in the presence if
+dissimilar magnetic orbitals on crystallographically nonequivalent Cu sites. We
+also show how these anisotropy terms affect the spin-wave spectrum and how they
+can be tracked experimentally.",2308.03599v2
+2023-09-02,Electron Spin Polarization as a Predictor of Chiroptical Activity in Helical Molecules,"Chiral structures, breaking spatial inversion symmetry, exhibit non-zero
+chiroptical activity (COA) due to the interaction between their electric and
+magnetic responses under external electromagnetic fields, an effect that is
+otherwise absent in achiral systems. Non-magnetic chiral structures also
+exhibit Chiral Induced Spin Selectivity (CISS), where spin-polarization (SP)
+emerges without external magnetic influence. We have obtained a COA-SP
+connection for a model system of an electron constrained to a helix including
+spin-orbit coupling (SOC), and in the presence of an external electromagnetic
+field. Despite its simplicity, this model captures the relevant physics
+required to address the problem. In particular, our results reveal that the
+norm of the SP vector can be used as a predictor of COA. In addition to SOC and
+the breaking of space inversion, a non-vanishing SP requires the breaking of
+time-reversal symmetry (TRS), as demanded by Onsager's reciprocity. Beyond the
+relationship between SP and COA, we obtain the novel result that TRS breaking
+is also necessary to yield a non-vanishing contribution of the SOC to the COA.",2309.00919v1
+2024-03-15,Half-metallic transport and spin-polarized tunneling through the van der Waals ferromagnet Fe${_4}$GeTe$_{2}$,"The recent emergence of van der Waals (vdW) ferromagnets has opened new
+opportunities for designing spintronic devices. We theoretically investigate
+the coherent spin-dependent transport properties of the vdW ferromagnet
+Fe$_4$GeTe$_2$, by using density functional theory combined with the
+non-equilibrium Green's functions method. We find that the conductance in the
+direction perpendicular to the layers is half-metallic, namely it is entirely
+spin-polarized, as a result of the material's electronic structure. This
+characteristic persists from bulk to single layer, even under significant bias
+voltages, and it is little affected by spin-orbit coupling and electron
+correlation. Motivated by this observation, we then investigate the tunnel
+magnetoresistance (TMR) effect in an magnetic tunnel junction, which comprises
+two Fe$_4$GeTe$_2$ layers separated by the vdW gap acting as insulating
+barrier. We predict a TMR ratio of almost 500\%, which can be further boosted
+by increasing the number of Fe$_4$GeTe$_2$ layers in the junction.",2403.10195v1
+2017-03-06,Transport in superconductor--normal metal--superconductor tunneling structures: Spinful p-wave and spin-orbit-coupled topological wires,"We theoretically study transport properties of voltage-biased one-dimensional
+superconductor--normal metal--superconductor tunnel junctions with arbitrary
+junction transparency where the superconductors can have trivial or nontrivial
+topology. Motivated by recent experimental efforts on Majorana properties of
+superconductor-semiconductor hybrid systems, we consider two explicit models
+for topological superconductors: (i) spinful p-wave, and (ii) spin-split
+spin-orbit-coupled s-wave. We provide a comprehensive analysis of the
+zero-temperature dc current $I$ and differential conductance $dI/dV$ of
+voltage-biased junctions with or without Majorana zero modes (MZMs). The
+presence of an MZM necessarily gives rise to two tunneling conductance peaks at
+voltages $eV = \pm \Delta_{\mathrm{lead}}$, i.e., the voltage at which the
+superconducting gap edge of the lead aligns with the MZM. We find that the MZM
+conductance peak probed by a superconducting lead $without$ a BCS singularity
+has a non-universal value which decreases with decreasing junction
+transparency. This is in contrast to the MZM tunneling conductance measured by
+a superconducting lead $with$ a BCS singularity, where the conductance peak in
+the tunneling limit takes the quantized value $G_M = (4-\pi)2e^2/h$ independent
+of the junction transparency. We also discuss the ""subharmonic gap structure"",
+a consequence of multiple Andreev reflections, in the presence and absence of
+MZMs. Finally, we show that for finite-energy Andreev bound states (ABSs), the
+conductance peaks shift away from the gap bias voltage $eV = \pm
+\Delta_{\mathrm{lead}}$ to a larger value set by the ABSs energy. Our work
+should have important implications for the extensive current experimental
+efforts toward creating topological superconductivity and MZMs in semiconductor
+nanowires proximity coupled to ordinary s-wave superconductors.",1703.02047v2
+2017-10-01,Slater Insulator in Iridate Perovskites with Strong Spin-Orbit Coupling,"The perovskite SrIrO3 is an exotic narrow-band metal owing to a confluence of
+the strengths of the spin-orbit coupling (SOC) and the electron-electron
+correlations. It has been proposed that topological and magnetic insulating
+phases can be achieved by tuning the SOC, Hubbard interactions, and/or lattice
+symmetry. Here, we report that the substitution of nonmagnetic, isovalent Sn4+
+for Ir4+ in the SrIr1-xSnxO3 perovskites synthesized under high pressure leads
+to a metal-insulator transition to an antiferromagnetic (AF) phase at TN > 225
+K. The continuous change of the cell volume as detected by x-ray diffraction
+and the lamda-shape transition of the specific heat on cooling through TN
+demonstrate that the metal-insulator transition is of second-order. Neutron
+powder diffraction results indicate that the Sn substitution enlarges an
+octahedral-site distortion that reduces the SOC relative to the spin-spin
+exchange interaction and results in the type-G AF spin ordering below TN.
+Measurement of high-temperature magnetic susceptibility shows the evolution of
+magnetic coupling in the paramagnetic phase typical of weak itinerant-electron
+magnetism in the Sn-substituted samples. A reduced structural symmetry in the
+magnetically ordered phase leads to an electron gap opening at the Brillouin
+zone boundary below TN in the same way as proposed by Slater.",1710.00304v2
+2012-10-10,Bodily tides near the 1:1 spin-orbit resonance. Correction to Goldreich's dynamical model,"Spin-orbit coupling is often described in the ""MacDonald torque"" approach
+which has become the textbook standard. Within this method, a concise
+expression for the additional tidal potential, derived by MacDonald (1964; Rev.
+Geophys. 2, 467), is combined with an assumption that the Q factor is
+frequency-independent (i.e., that the geometric lag angle is constant in time).
+This makes the approach unphysical because MacDonald's derivation of the said
+formula was implicitly based on keeping the time lag frequency-independent,
+which is equivalent to setting Q to scale as the inverse tidal frequency. The
+contradiction requires the MacDonald treatment of both non-resonant and
+resonant rotation to be rewritten.
+  The non-resonant case was reconsidered by Efroimsky & Williams (2009; CMDA
+104, 257), in application to spin modes distant from the major
+commensurabilities. We continue this work by introducing the necessary
+alterations into the MacDonald-torque-based model of falling into a 1:1
+resonance. (For the original version of the model, see Goldreich 1966; AJ 71,
+1.)
+  We also study the effect of the triaxiality on both circulating and librating
+rotation near the synchronous state. Circulating rotation may evolve toward the
+libration region or toward a spin rate larger than synchronous
+(pseudosynchronous spin). Which behaviour depends on the eccentricity, the
+triaxiality of the primary, and the mass ratio of the secondary and primary
+bodies. The spin evolution will always stall for the oblate case. For
+small-amplitude librations, expressions are derived for the libration
+frequency, damping rate, and average orientation.
+  However, the stability of pseudosynchronous spin hinges upon the dissipation
+model. Makarov and Efroimsky (2012; arXiv:1209.1616) have found that a more
+realistic dissipation model than the corrected MacDonald torque makes
+pseudosynchronous spin unstable.",1210.2923v3
+2019-12-29,Giant momentum-dependent spin splitting in centrosymmetric low Z antiferromagnets,"The energy vs. crystal momentum E(k) diagram for a solid (band structure)
+constitutes the road map for navigating its optical, magnetic, and transport
+properties. By selecting crystals with specific atom types, composition and
+symmetries, one could design a target band structure and thus desired
+properties. A particularly attractive outcome would be to design energy bands
+that are split into spin components with a momentum-dependent splitting, as
+envisioned by Pekar and Rashba [Zh. Eksperim. i Teor. Fiz. 47 (1964)], enabling
+spintronic application. The current paper provides ""design principles"" for
+wavevector dependent spin splitting (SS) of energy bands that parallels the
+traditional Dresselhaus and Rashba spin-orbit coupling (SOC) - induce
+splitting, but originates from a fundamentally different source --
+antiferromagnetism. We identify a few generic AFM prototypes with distinct SS
+patterns using magnetic symmetry design principles. These tools allow also the
+identification of specific AFM compounds with SS belonging to different
+prototypes. A specific compound -- centrosymmetric tetragonal MnF2 -- is used
+via density functional band structure calculations to quantitatively illustrate
+one type of AFM SS. Unlike the traditional SOC-induced effects restricted to
+non-centrosymmetric crystals, we show that antiferromagnetic-induced spin
+splitting broadens the playing field to include even centrosymmetric compounds,
+and gives SS comparable in magnitude to the best known ('giant') SOC effects,
+even without SOC, and consequently does not rely on the often-unstable high
+atomic number elements required for high SOC. We envision that use of the
+current design principles to identify an optimal antiferromagnet with
+spin-split energy bands would be beneficial for efficient spin-charge
+conversion and spin orbit torque applications without the burden of requiring
+compounds containing heavy elements.",1912.12689v3
+2018-10-30,On the Origin of Black Hole Spin in High-mass X-Ray Binaries,"Black hole (BH) spins in low-mass X-ray binaries (LMXBs) cover a range of
+values that can be explained by accretion after BH birth. In contrast, the
+three BH spin measurements in high-mass X-ray binaries (HMXBs) show only values
+near the maximum and likely have a different origin connected to the BH stellar
+progenitor. We explore here two possible scenarios to explain the high spins of
+BHs in HMXBs: formation in binaries that undergo mass transfer (MT) during the
+main sequence (MS; Case-A MT), and very close binaries undergoing chemically
+homogeneous evolution (CHE). We find that both scenarios are able to produce
+high-spin BHs if internal angular momentum (AM) transport in the progenitor
+star after its MS evolution is not too strong (i.e., weak coupling between the
+stellar core and its envelope). If instead efficient AM transport is assumed,
+we find that the resulting BH spins are always too low with respect to
+observations. The Case-A MT model provides a good fit for the BH spins, the
+masses of the two components, and the final orbital periods for two of the
+three BHs in HMXBs with measured spins. For one of them, the mass predicted for
+the BH companion is significantly lower than observed, but this depends
+strongly on the assumed efficiency of mass transfer. The CHE models predict
+orbital periods that are too large for all three cases considered here. We
+expect the Case-A MT to be much more frequent at the metallicities involved, so
+we conclude that the Case-A MT scenario is preferred. Finally, we predict that
+the stellar companions of HMXBs formed through the Case-A MT have enhanced
+nitrogen surface abundances, which can be tested by future observations.",1810.13016v3
+2013-01-17,"63,65Cu Nuclear Resonance Study of the Coupled Spin Dimers and Chains Compound Cu2Fe2Ge4O13","Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) of Cu
+have been measured in a coupled spin dimers and chains compound Cu2Fe2Ge4O13.
+Cu NQR has also been measured in an isostructural material Cu2Sc2Ge4O13
+including only spin dimers. Comparison of the temperature dependence of the
+63Cu nuclear spin-lattice relaxation rate between the two compounds reveals
+that the Fe chains in Cu2Fe2Ge4O13 do not change a spin gap energy of the Cu
+dimers from that in Cu2Sc2Ge4O13, contributing additionally to the relaxation
+rate at the Cu site. A modestly large internal field of 3.39 T was observed at
+the Cu site in the antiferromagnetic state of Cu2Fe2Ge4O13 at 4.2 K, which is
+partly because of quantum reduction of the ordered moment of a Cu atom. The
+internal field and the ordered moment of Cu are noncollinear due to large
+anisotropy of the hyperfine interaction at the Cu site. A model analysis of the
+internal field based on the fourfold planar coordination of Cu suggests that a
+3d hole of the Cu2+ ion is mainly in the d(x2-y2) orbital state.",1301.3974v2
+2014-07-03,Hyperfine coupling and spin polarization in the bulk of the topological insulator Bi$_2$Se$_3$,"Nuclear magnetic resonance (NMR) and transport measurements have been
+performed at high magnetic fields and low temperatures in a series of $n$-type
+Bi$_{2}$Se$_{3}$ crystals. In low density samples, a complete spin polarization
+of the electronic system is achieved, as observed from the saturation of the
+isotropic component of the $^{209}$Bi NMR shift above a certain magnetic field.
+The corresponding spin splitting, defined in the phenomenological approach of a
+3D electron gas with a large (spin-orbit-induced) effective $g$-factor, scales
+as expected with the Fermi energy independently determined by simultaneous
+transport measurements. Both the effective electronic $g$-factor and the
+""contact"" hyperfine coupling constant are precisely determined. The magnitude
+of this latter reveals a non negligible $s$-character of the electronic wave
+function at the bottom of the conduction band. Our results show that the bulk
+electronic spin polarization can be directly probed via NMR and pave the way
+for future NMR investigations of the electronic states in Bi-based topological
+insulators.",1407.1040v2
+2015-11-24,Dynamical magnetoelectric phenomena of multiferroic skyrmions,"Magnetic skyrmions, vortex-like swirling spin textures characterized by a
+quantized topological invariant, realized in chiral-lattice magnets are
+currently attracting intense research interest. In particular, their dynamics
+under external fields is an issue of vital importance both for fundamental
+science and for technical application. Whereas observations of magnetic
+skyrmions had been limited to metallic magnets so far, their realization was
+discovered also in a chiral-lattice insulating magnet Cu2OSeO3 in 2012.
+Skyrmions in the insulator turned out to exhibit multiferroic nature with
+spin-induced ferroelectricity. Strong magnetoelectric coupling between
+noncollinear skyrmion spins and electric polarizations mediated by relativistic
+spin-orbit interaction enables us to drive motion and oscillation of magnetic
+skyrmions by application of electric fields instead of injection of electric
+currents. Insulating materials also provide an environment suitable for
+detection of pure spin dynamics through spectroscopic measurements owing to
+absence of appreciable charge excitations. In this article, we review recent
+theoretical and experimental studies on multiferroic properties and dynamical
+magnetoelectric phenomena of magnetic skyrmions in insulators. We argue that
+multiferroic skyrmions show unique coupled oscillation modes of magnetizations
+and polarizations, so-called electromagnon excitations, which are both
+magnetically and electrically active, and interference between the electric and
+magnetic activation processes leads to peculiar magnetoelectric effects in a
+microwave frequency regime.",1511.07761v1
+2016-02-19,Helical currents in metallic Rashba strips,"We study the texture of helical currents in metallic planar strips in the
+presence of Rashba spin-orbit coupling (RSOC) on the lattice at zero
+temperature. In the noninteracting case, and in the absence of external
+electromagnetic sources, we determine by exact numerical diagonalization of the
+single-particle Hamiltonian, the distribution across the strip section of these
+Rashba helical currents (RHC) as well as their sign oscillation, as a function
+of the RSOC strength, strip width, electron filling, and strip boundary
+conditions. Then, we study the effects of charge currents introduced into the
+system by an Aharonov-Bohm flux for the case of rings or by a voltage bias in
+the case of open strips. The former setup is studied by variational Monte
+Carlo, and the later, by the time-dependent density-matrix-renormalization
+group technique. Particularly for strips formed by two, three and four coupled
+chains, we show how these RHC vary in the presence of such induced charge
+current, and how their differences between spin-up and spin-down electron
+currents on each chain, help to explain the distribution across the strip of
+charge currents, both of the spin conserving and the spin flipping types. We
+also predict the appearance of polarized charge currents on each chain.
+Finally, we show that these Rashba helical currents and their derived features
+remain in the presence of an on-site Hubbard repulsion as long as the system
+remains metallic, at quarter filling, and even at half-filling where a
+Mott-Hubbard metal-insulator transition occurs for large Hubbard repulsion.",1602.06193v2
+2018-05-26,Distinct spin-lattice and spin-phonon interactions in monolayer magnetic CrI$_3$,"We apply the density-functional theory to study various phases (including
+non-magnetic (NM), anti-ferromagnetic (AFM), and ferromagnetic (FM)) in
+monolayer magnetic chromium triiodide (CrI$_3$), a recently fabricated 2D
+magnetic material. It is found that: (1) the introduction of magnetism in
+monolayer CrI$_3$ gives rise to metal-to-semiconductor transition; (2) the
+electronic band topologies as well as the nature of direct and indirect band
+gaps in either AFM or FM phases exhibit delicate dependence on the magnetic
+ordering and spin-orbit coupling; and (3)the phonon modes involving Cr atoms
+are particularly sensitive to the magnetic ordering, highlighting distinct
+spin-lattice and spin-phonon coupling in this magnet. First-principles
+simulations of the Raman spectra demonstrate that both frequencies and
+intensities of the Raman peaks strongly depend on the magnetic ordering. The
+polarization dependent $A_{1g}$ modes at 77 cm$^{-1}$ and 130 cm$^{-1}$ along
+with the $E_g$ mode at about 50 cm$^{-1}$ in the FM phase may offer a useful
+fingerprint to characterize this material. Our results not only provide a
+detailed guiding map for experimental characterization of CrI$_3$, but also
+reveal how the evolution of magnetism can be tracked by its lattice dynamics
+and Raman response.",1805.10479v2
+2018-05-27,Simulation of inelastic spin flip excitations and Kondo effect in STM spectroscopy of magnetic molecules on metal substrates,"Single-ion magnetic anisotropy in molecular magnets leads to spin flip
+excitations that can be measured by inelastic scanning tunneling microscope
+(STM) spectroscopy. Here I present a semi ab initio scheme to compute the
+spectral features associated with inelastic spin flip excitations and Kondo
+effect of single molecular magnets. To this end density functional theory
+calculations of the molecule on the substrate are combined with more
+sophisticated many-body techniques for solving the Anderson impurity problem of
+the spin-carrying orbitals of the magnetic molecule coupled to the rest of the
+system, containing a phenomenological magnetic anisotropy term. For calculating
+the STM spectra an exact expression for the dI/dV in the ideal STM limit, when
+the coupling to the STM tip becomes negligibly small, is derived. In this limit
+the dI/dV is simply related to the spectral function of the molecule-substrate
+system. For the case of an Fe porphyrin molecule on the Au(111) substrate, the
+calculated STM spectra are in good agreement with recently measured STM
+spectra, showing the typical step features at finite bias associated with spin
+flip excitation of a spin-1 quantum magnet. For the case of Kondo effect in Mn
+porphyrin on Au(111), the agreement with the experimental spectra is not as
+good due to the neglect of quantum interference in the tunneling.",1805.10624v1
+2020-10-26,Pressure-induced phase transition in the $J_1$-$J_2$ square lattice antiferromagnet RbMoOPO$_4$Cl,"We report results of magnetization and $^{31}$P NMR measurements under high
+pressure up to 6.4~GPa on RbMoOPO$_4$Cl, which is a frustrated square-lattice
+antiferromagnet with competing nearest-neighbor and next-nearest-neighbor
+interactions. Anomalies in the pressure dependences of the NMR shift and the
+transferred hyperfine coupling constants indicate a structural phase transition
+at 2.6~GPa, which is likely to break mirror symmetry and triggers significant
+change of the exchange interactions. In fact, the NMR spectra in magnetically
+ordered states reveal a change from the columnar antiferromagnetic (CAF) order
+below 3.3~GPa to the N\'{e}el antiferromagnetic (NAF) order above 3.9~GPa. The
+spin lattice relaxation rate $1/T_1$ also indicates a change of dominant
+magnetic fluctuations from CAF-type to NAF-type with pressure. Although the NMR
+spectra in the intermediate pressure region between 3.3 and 3.9 GPa show
+coexistence of the CAF and NAF phases, a certain component of $1/T_1$ shows
+paramagnetic behavior with persistent spin fluctuations, leaving possibility
+for a quantum disordered phase. The easy-plane anisotropy of spin fluctuations
+with unusual nonmonotonic temperature dependence at ambient pressure gets
+reversed to the Ising anisotropy at high pressures. This unexpected anisotropic
+behavior for a spin 1/2 system may be ascribed to the strong spin-orbit
+coupling of Mo-4$d$ electrons.",2010.13538v2
+2016-03-16,"First-principles study of the magnetic ground state in kagome francisites Cu3Bi(SeO3)2O2X (X=Cl, Br)","We explore magnetic behavior of kagome francisites Cu3Bi(SeO3)2O2X (X = Cl
+and Br) using first-principles calculations. To this end, we propose an
+approach based on the Hubbard model in the Wannier functions basis constructed
+on the level of local-density approximation (LDA). The ground-state spin
+configuration is determined by a Hartree-Fock solution of the Hubbard model
+both in zero magnetic field and in applied magnetic fields. Additionally,
+parameters of an effective spin Hamiltonian are obtained by taking into account
+the hybridization effects and spin-orbit coupling. We show that only the former
+approach, the Hartree-Fock solution of the Hubbard model, allows for a complete
+description of the anisotropic magnetization process. While our calculations
+confirm that the canted zero-field ground state arises from a competition
+between ferromagnetic nearest-neighbor and antiferromagnetic
+next-nearest-neighbor couplings in the kagome planes, weaker anisotropic terms
+are crucial for fixing spin directions and for the overall magnetization
+process. We thus show that the Hartree-Fock solution of an electronic
+Hamiltonian is a viable alternative to the analysis of effective spin
+Hamiltonians when a magnetic ground state and effects of external field are
+considered.",1603.05192v1
+2017-07-22,Electronic and magnetic properties of the monolayer RuCl$_3$: A first-principles and Monte Carlo study,"Recent experiments revealed that monolayer $\alpha$-RuCl$_3$ can be obtain by
+chemical exfoliation method and exfoliation or restacking of nanosheets can
+manipulate the magnetic properties of the materials. In this present paper, the
+electronic and magnetic properties of $\alpha$-RuCl$_3$ monolayer are
+investigated by combining first-principles calculations and Monte Carlo
+simulations. From first-principles calculations, we found that the spin
+configuration FM corresponds to the ground state for $\alpha$-RuCl$_3$,
+however, the other excited zigzag oriented spin configuration has energy of 5
+meV/atom higher than the ground state. Energy band gap has been obtained as $3$
+meV using PBE functionals. When spin-orbit coupling effect is taken into
+account, corresponding energy gap is determined to be as $57$ meV. We also
+investigate the effect of Hubbard U energy terms on the electronic band
+structure of $\alpha$-RuCl$_3$ monolayer and revealed band gap increases
+approximately linear with increasing U value. Moreover, spin-spin coupling
+terms ($J_1$, $J_2$, $J_3$) have been obtained using first principles
+calculations. By benefiting from these terms, Monte Carlo simulations with
+single site update Metropolis algorithm have been implemented to elucidate
+magnetic properties of the considered system. Thermal variations of
+magnetization, susceptibility and also specific heat curves indicate that
+monolayer $\alpha$-RuCl$_3$ exhibits a phase transition between ordered and
+disordered phases at the Curie temperature $14.21$ K. We believe that this
+study can be utilized to improve two-dimensional magnet materials.",1707.07198v2
+2021-03-23,Rare-earth chalcohalides: A family of van der Waals layered Kitaev spin liquid candidates,"Kitaev spin liquid (KSL) system has attracted tremendous attention in past
+years because of its fundamental significance in condensed matter physics and
+promising applications in fault-tolerant topological quantum computation.
+Material realization of such a system remains a major challenge in the field
+due to the unusual configuration of anisotropic spin interactions, though great
+effort has been made before. Here we reveal that rare-earth chalcohalides REChX
+(RE=rare earth, Ch=O, S, Se, Te, X=F, Cl, Br, I) can serve as a family of KSL
+candidates. Most family members have the typical SmSI-type structure with a
+high symmetry of R-3m and rare-earth magnetic ions form an undistorted
+honeycomb lattice. The strong spin-orbit coupling of 4f electrons intrinsically
+offers anisotropic spin interactions as required by Kitaev model. We have grown
+the crystals of YbOCl and synthesized the polycrystals of SmSI, ErOF, HoOF and
+DyOF, and made careful structural characterizations. We carry out magnetic and
+heat capacity measurements down to 1.8 K and find no obvious magnetic
+transition in all the samples but DyOF. The van der Waals interlayer coupling
+highlights the true two-dimensionality of the family which is vital for the
+exact realization of Abelian/non-Abelian anyons, and the graphene-like feature
+will be a prominent advantage for developing miniaturized devices. The family
+is expected to act as an inspiring material platform for the exploration of KSL
+physics.",2103.12309v2
+2021-09-02,Supercurrent-induced long-range triplet correlations and controllable Josephson effect in superconductor/ferromagnet hybrids with extrinsic SOC,"We predict that long-range triplet correlations (LRTC) in
+superconductor/ferromagnet (S/F) hybrids with extrinsic impurity spin-orbit
+coupling (SOC) can be generated and manipulated by supercurrent flowing in the
+superconducting leads along the S/F interfaces. The LRTC appear via two basic
+mechanisms. The essence of the first one is the generation of triplets by the
+superconducting spin Hall effect. These pairs are long-range in the ferromagnet
+under the appropriate mutual orientation of the condensate momentum and the
+ferromagnet magnetization. The second mechanism is based on the singlet-triplet
+conversion at the S/F interface followed by the rotation of the spin of the
+obtained short-range opposite-spin pairs via the spin current swapping
+mechanism. The structure of the supercurrent-induced LRTC is studied both for
+S/F bilayers and S/F/S Josephson junctions. We demonstrate that in S/F/S
+junctions, where the Josephson coupling is realized via the
+supercurrent-induced LRTC, the ground state phase can be switched between $0$
+and $\pi$ in a controllable manner. The switching is performed by reversing the
+supercurrent in one of superconducting leads, thus realizing a new physical
+principle of the $0-\pi$ shifter.",2109.00966v2
+2021-12-29,Twisted nodal wires and three-dimensional quantum spin Hall effect in distorted square-net compounds,"Recently, square-net materials have attracted lots of attention for the Dirac
+semimetal phase with negligible spin-orbit coupling (SOC) gap, e.g.
+ZrSiS/LaSbTe and CaMnSb$_2$. In this paper, we demonstrate that the Jahn-Teller
+effect enlarges the nontrivial SOC gap in the distorted structure, e.g. LaAsS
+and SrZnSb$_2$. Its distorted $X$ square-net layer ($X=$ P, As, Sb, Bi)
+resembles a quantum spin Hall (QSH) insulator. Since these QSH layers are
+simply stacked in the $\hat{x}$ direction and weakly coupled, three-dimensional
+QSH effect can be expected in these distorted materials, such as insulating
+compounds CeAs$_{1+x}$Se$_{1-y}$ and EuCdSb$_2$. Our detailed calculations show
+that it hosts two twisted nodal wires without SOC [each consists of two
+noncontractible time-reversal symmetry- and inversion symmetry-protected nodal
+lines touching at a fourfold degenerate point], while with SOC it becomes a
+topological crystalline insulator with symmetry indicators $(000; 2)$ and
+mirror Chern numbers $(0, 0)$. The nontrivial band topology is characterized by
+a generalized spin Chern number $C_{s+}=2$ when there is a gap between two sets
+of $\hat{s}_{x}$ eigenvalues. The nontrivial topology of these materials can be
+well reproduced by our tight-binding model and the calculated spin Hall
+conductivity is quantized to $\sigma^{x}_{yz} =
+(\frac{\hbar}{e})\frac{G_xe^2}{\pi h}$ with $G_x$ a reciprocal lattice vector.",2112.14467v3
+2022-06-03,Anisotropic Laser-Pulse-Induced Magnetization Dynamics in van der Waals Magnet Fe$_3$GeTe$_2$,"Femtosecond laser-pulse excitation provides an energy efficient and fast way
+to control magnetization at the nanoscale, providing great potential for
+ultrafast next-generation data manipulation and nonvolatile storage devices.
+Ferromagnetic van der Waals materials have garnered much attention over the
+past few years due to their low dimensionality, excellent magnetic properties,
+and large response to external stimuli. Nonetheless, their behaviour upon fs
+laser-pulse excitation remains largely unexplored. Here, we investigate the
+ultrafast magnetization dynamics of a thin flake of Fe$_3$GeTe$_2$ (FGT) and
+extract its intrinsic magnetic properties using a microscopic framework. We
+find that our data is well described by our modelling, with FGT undergoing a
+slow two-step demagnetization, and we experimentally extract the
+spin-relaxation timescale as a function of temperature, magnetic field and
+excitation fluence. Our observations indicate a large spin-flip probability in
+agreement with a theoretically expected large spin-orbit coupling, as well as a
+weak interlayer exchange coupling. The spin-flip probability is found to
+increase when the magnetization is pulled away from its quantization axis,
+opening doors to an external control over the spins in this material. Our
+results provide a deeper understanding of the dynamics van der Waals materials
+upon fs laser-pulse excitation, paving the way towards two-dimensional
+materials-based ultrafast spintronics.",2206.01452v1
+2023-09-05,Tunable Magnetism and Valleys in VSiZ$_3$ monolayers,"Two-dimensional magnetism and valleys have recently emerged as two
+significant research areas, with intriguing properties and practical uses in
+advanced information technology. Considering the importance of these two areas
+and their couplings, controllable creations of both the magnetism and valley
+polarization are highly sought after. Based on first-principles calculations,
+we propose a new class of two-dimensional monolayers with a chemical formula of
+MAZ$_3$, which is viewed as a 2H-MZ$_2$ trilayer passivated by the A-Z bilayer
+on its one side. Taking VSiN$_3$ as an example, the MAZ$_3$ monolayers are
+found to exhibit tunable magnetism and valleys. For the intrinsic VSiN$_3$
+monolayer, it is a non-magnetic semiconductor, with multiple degenerate valleys
+and trigonal warping near $K_\pm$ points in the band structure. Besides, the
+bands have spin splittings owing to the spin-orbit coupling. Under a moderate
+carrier doping, the monolayer becomes a Stoner ferromagnet, which enhances the
+spin splittings of the valence band and generates valley splittings. Moreover,
+the Berry curvature is valley contrasting, leading to distinct valley-spin
+related anomalous Hall currents as the doping concentration increases. Our work
+opens up new way to modulate the spin splittings and valley splittings via
+electric means, and provides opportunities for exploring advanced spintronic
+and valleytronic devices.",2309.01873v1
+2012-08-08,Spin-charge conversion in multiterminal Aharonov-Casher ring coupled to precessing ferromagnets: A charge conserving Floquet-nonequilibrium Green function approach,"We derive a non-perturbative solution to the Floquet-nonequilibrium Green
+function (Floquet-NEGF) describing open quantum systems periodically driven by
+an external field of arbitrary strength of frequency. By adopting the
+reduced-zone scheme, we obtain expressions rendering conserved charge currents
+for any given maximum number of photons, distinguishable from other existed
+Floquet-NEGF-based expressions where, less feasible, infinite number of photons
+needed to be taken into account to ensure the conservation. To justify our
+derived formalism and to investigate spin-charge conversions by spin-orbit
+coupling (SOC), we consider the spin-driven setups as reciprocal to the
+electric-driven setups in S. Souma et. al., Phys. Rev. B 70, 195346 (2004) and
+Phys. Rev. Lett. 94, 106602 (2005). In our setups, pure spin currents are
+driven by the magnetization dynamics of a precessing ferromagnetic (FM) island
+and then are pumped into the adjacent two- or four-terminal mesoscopic
+Aharonov-Casher (AC) ring of Rashba SOC where spin-charge conversions take
+place. Our spin-driven results show reciprocal features that excellently agree
+with the findings in the electric-driven setups mentioned above. We propose two
+types of symmetry operations, under which the AC ring Hamiltonian is invariant,
+to argue the relations of the pumped/converted currents in the leads within the
+same or between different pumping configurations. The symmetry arguments are
+independent of the ring width and the number of open channels in the leads,
+terminals, and precessing FM islands, In particular, net pure in-plane spin
+currents and pure spin currents can be generated in the leads for certain
+setups of two terminals and two precessing FM islands with the current
+magnitude and polarization direction tunable by the pumping configuration, gate
+voltage covering the two-terminal AC ring in between the FM islands.",1208.2275v1
+2015-03-17,Surface versus bulk contributions to the giant Rashba splitting in the ferroelectric α-GeTe(111) semiconductor,"In systems with broken inversion symmetry spin-orbit coupling (SOC) yields a
+Rashba-type spin splitting of electronic states, manifested in a k-dependent
+splitting of the bands. While most research had previously focused on 2D
+electron systems, recently a three-dimensional (3D) form of such Rashba-effect
+was found in a series of bismuth tellurohalides. Whereas these materials
+exhibit a very large spin-splitting, they lack an important property concerning
+functionalization, namely the possibility to switch or tune the spin texture.
+This limitation can be overcome in a new class of functional materials
+displaying Rashba-splitting coupled to ferroelectricity: the ferroelectric
+Rashba semiconductors (FERS). Using spin- and angle-resolved photoemission
+spectroscopy (SARPES) we show that GeTe(111) forms a prime member of this
+class, displaying a complex spin-texture for the Rashba-split surface and bulk
+bands arising from the intrinsic inversion symmetry breaking caused by the
+ferroelectric polarization of the bulk (FE). Apart from pure surface and bulk
+states we find surface-bulk resonant states (SBR) whose wavefunctions entangle
+the spinors from the bulk and surface contributions. At the Fermi level their
+hybridization results in unconventional spin topologies with cochiral
+helicities and concomitant gap opening. The GeTe(111) surface and SBR states
+make the semiconductor surface conducting. At the same time our SARPES data
+confirm that GeTe is a narrow-gap semiconductor, suggesting that GeTe(111)
+electronic states are endowed with spin properties that are theoretically
+challenging to anticipate. As the helicity of the spins in Rashba bands is
+connected to the direction of the FE polarization, this work paves the way to
+all-electric non-volatile control of spin-transport properties in
+semiconductors.",1503.05004v1
+2013-09-25,Spin-Seebeck effect on the surface of topological insulator due to nonequilibrium spin-polarization parallel to the direction of thermally driven electronic transport,"We study the transverse spin-Seebeck effect (SSE) on the surface of a
+three-dimensional topological insulator (TI) thin film, such as Bi$_2$Se$_3$,
+which is sandwiched between two normal metal leads. The temperature bias
+$\Delta T$ applied between the leads generates surface charge current which
+becomes spin-polarized due to strong spin-orbit coupling on the TI surface,
+with polarization vector acquiring a component $P_x \simeq 60%$ {\em parallel
+to the direction of transport}. When the third nonmagnetic voltage probe is
+attached to the portion of the TI surface across its width $L_y$, pure spin
+current will be injected into the probe where the inverse spin Hall effect
+(ISHE) converts it into a voltage signal
+\mbox{$|V_\mathrm{ISHE}|^\mathrm{max}/\Delta T \simeq 2.5$ $\mu$V/K} (assuming
+the SH angle of Pt voltage probe and $L_y=1$ mm). The existence of predicted
+nonequilibrium spin-polarization parallel to the direction of electronic
+transport and the corresponding electron-driven SSE crucially relies on
+orienting quintuple layers (QLs) of Bi$_2$Se$_3$ {\em orthogonal} to the TI
+surface and {\em tilted} by $45^\circ$ with respect to the direction of
+transport. Our analysis is based on the Landauer-B\""{u}ttiker-type formula for
+spin currents in the leads of a multi-terminal quantum-coherent junction, which
+is constructed using nonequilibrium Green function formalism within which we
+show how to take into account arbitrary orientation of QLs via the self-energy
+describing coupling between semi-infinite normal metal leads and TI.",1309.6447v3
+2019-12-09,Ultrafast Microscopy of a Plasmonic Spin Skyrmion,"We present an ultrafast microscopy imaging experiment and a general
+analytical description of a new quasiparticle composed of plasmonic
+Skyrmion-like spin texture at the core of a surface plasmon polariton (SPP)
+vortex. The illumination of a circular coupling structure milled in an Ag film
+by circularly polarized light (CPL) couples its spin angular momentum (SAM)
+into orbital angular momentum (OAM) of SPPs launching them to form a plasmonic
+vortex. The coupling of the cycloidal motion of the SPP polarization at the 2D
+interface, with their orbital swirl at the vortex core causes the plasmonic
+field to generate 3D SAM pseudovectors, whose topological texture has integer
+Skyrmion number and is homotopic to a twisted magnetic Skyrmion quasiparticle
+with the boundary defined by an optical L-line singularity contour. An
+analytical description finds that the dielectric discontinuity at the Ag/vacuum
+interface supports on each side entwined twisted Skyrmion pairs that are
+characterized by stable topological textures with opposite Skyrmion numbers.
+The SAM texture of the Skyrmion pair within the primary vortex ring corresponds
+to a monopole-hedgehog type SAM texture, with a SAM singularity at the vortex
+core. Interferometric time-resolved two-photon photoemission electron
+microscopy (ITR-2P-PEEM) imaging of the nanofemto spatiotemporal evolution of
+the SPP fields and simulation by an analytical model, establish the twisted
+topological plasmonic SAM Skyrmion quasiparticle at the vortex core. The SAM
+textures can probe and simulate topological responses in trivial and
+topological materials that can be coupled in the near-field of the SPP vortex.
+The theory anticipates different field structures and the accompanying
+topological spin textures that construct single Skyrmion and meron-like
+quasiparticles as well as their arrays.",1912.03826v1
+2012-12-21,Next-to-next-to-leading order spin-orbit effects in the near-zone metric and precession equations of compact binaries,"We extend our previous work devoted to the computation of the
+next-to-next-to-leading order spin-orbit correction (corresponding to 3.5PN
+order) in the equations of motion of spinning compact binaries, by: (i)
+Deriving the corresponding spin-orbit terms in the evolution equations for the
+spins, the conserved integrals of the motion and the metric regularized at the
+location of the particles (obtaining also the metric all-over the near zone but
+with some lower precision); (ii) Performing the orbital reduction of the
+precession equations, near-zone metric and conserved integrals to the center-
+of-mass frame and then further assuming quasi-circular orbits (neglecting
+gravitational radiation reaction). The results are systematically expressed in
+terms of the spin variables with conserved Euclidean norm instead of the
+original antisymmetric spin tensors of the pole-dipole formalism. This work
+paves the way to the future computation of the next-to-next-to-leading order
+spin-orbit terms in the gravitational-wave phasing of spinning compact
+binaries.",1212.5520v2
+2014-11-17,Spin-orbital exchange of strongly interacting fermions on the $p$-band of a two-dimensional optical lattice,"Mott insulators with both spin and orbital degeneracy are pertinent to a
+large number of transition metal oxides. The intertwined spin and orbital
+fluctuations can lead to rather exotic phases such as quantum spin-orbital
+liquids. Here we consider two-component (spin 1/2) fermionic atoms with strong
+repulsive interactions on the $p$-band of the optical square lattice. We derive
+the spin-orbital exchange for quarter filling of the $p$-band when the density
+fluctuations are suppressed, and show it frustrates the development of long
+range spin order. Exact diagonalization indicates a spin-disordered ground
+state with ferro-orbital order. The system dynamically decouples into
+individual Heisenberg spin chains, each realizing a Luttinger liquid accessible
+at higher temperatures compared to atoms confined to the $s$-band.",1411.4496v2
+2021-02-24,Realization of exciton-mediated optical spin-orbit interaction in organic microcrystalline resonators,"The ability to control the spin-orbit interaction of light in optical
+microresonators is of fundamental importance for future photonics. Organic
+microcrystals, due to their giant optical anisotropy, play a crucial role in
+spin-optics and topological photonics. Here we realize controllable and
+wavelength-dependent Rashba-Dresselhaus spin-orbit interaction, attributed to
+the anisotropic excitonic response in an optical microcavity filled with an
+organic microcrystalline. We also investigate the transition of the spin-orbit
+interaction from dominant photonic type caused by the splitting of the
+transverse-electric and transverse-magnetic modes to spin-orbit interaction of
+the Rashba-Dresselhaus type. The interplay of the two allows us to engineer the
+spin-orbit interaction of light in organic microcavities, which besides its
+fundamental interest promises applications in spin-controlled on-chip
+integrated nanophotonic elements, towards exploiting non-magnetic and low-cost
+spin-photonic devices.",2102.12200v1
+2017-11-16,Effect of lattice distortion on U magnetic moments in $\mathrm{U_{4}Ru_{7}Ge_{6}}$ studied by polarized neutron diffraction,"Small spontaneous lattice distortion of a cubic ferromagnet at temperatures
+below $T_{\mathrm{C}}$ is expected, but usually a neglected phenomenon. This
+study is focused on such effect on the example of $\mathrm{U_{4}Ru_{7}Ge_{6}}$.
+We propose the lattice distortion from the cubic space group to a lower
+symmetry as a result of our DFT calculations. The strong spin-orbit coupling on
+the U site plays the most essential role, that should lower the symmetry of the
+system and give rise to the two different U sites (U1 and U2). We bring
+convincing experimental evidence for this splitting resulting from our
+polarized neutron diffraction experiment. Proper treatment of the flipping
+ratios collected in the ordered state and in the paramagnetic state reveals
+dramatically different magnetic moments on the U1 and U2 sites. We have reached
+good agreement of the results from the MAXENT method and from direct fitting of
+the data. The ratio of the orbital and spin component on the U2 site is lower
+than for the free $\mathrm{U^{3+}}$ or $\mathrm{U^{4+}}$ ion and points to a
+strong hybridization between the U $5f$ and Ru $4d$ wave functions. The same
+ratio on the U1 site is unexpectedly low. This would mean that its orbital
+component is almost quenched. We have observed the absence of a magnetic moment
+on the Ru1 site, but a rather large induced moment on the Ru2 site. Very
+similar results were obtained also in the paramagnetic state in the regime
+induced by the magnetic field. It points to the intimate coupling of the
+magnetic ordering and structural distortion as it is possible to split the U
+site in to two different polarizing paramagnetic U moments above
+$T_{\mathrm{C}}$ by a strong magnetic field. We propose that the difference
+between the magnetic moment on the U sites is caused by the change of local
+point symmetry of the sites that is tightly bound to the role of the strong
+spin-orbit interaction.",1711.06113v2
+2010-10-05,The barycentric motion of exoplanet host stars: tests of solar spin-orbit coupling,"Empirical evidence suggests a tantalising but unproven link between various
+indicators of solar activity and the barycentric motion of the Sun. The latter
+is exemplified by transitions between regular and more disordered motion
+modulated by the motions of the giant planets, and rare periods of retrograde
+motion with negative orbital angular momentum. An examination of the
+barycentric motion of exoplanet host stars, and their stellar activity cycles,
+has the potential of proving or disproving the Sun's motion as an underlying
+factor in the complex patterns of short- and long-term solar variability
+indices, by establishing whether such correlations exist in other planetary
+systems. A variety of complex patterns of barycentric motions of exoplanet host
+stars is demonstrated, depending on the number, masses and orbits of the
+planets. Each of the behavioural types proposed to correlate with solar
+activity are also evident in exoplanet host stars: repetitive patterns
+influenced by massive multiple planets, epochs of rapid change in orbital
+angular momentum, and intervals of negative orbital angular momentum. The study
+provides the basis for independent investigations of the widely-studied but
+unproven suggestion that the Sun's motion is somehow linked to various
+indicators of solar activity. We show that, because of the nature of their
+barycentric motions, the host stars HD168443 and HD74156 offer particularly
+powerful tests of this hypothesis.",1010.0966v1
+2011-02-28,Evidence for gravitational quadrupole moment variations in the companion of PSR J2051-0827,"We have conducted radio timing observations of the eclipsing millisecond
+binary pulsar J2051-0827 with the European Pulsar Timing Array network of
+telescopes and the Parkes radio telescope, spanning over 13 years. The
+increased data span allows significant measurements of the orbital
+eccentricity, e = (6.2 {\pm} 1.3) {\times} 10^{-5} and composite proper motion,
+{\mu}_t = 7.3 {\pm} 0.4 mas/yr. Our timing observations have revealed secular
+variations of the projected semi-major axis of the pulsar orbit which are much
+more extreme than those previously published; and of the orbital period of the
+system. Investigation of the physical mechanisms producing such variations
+confirm that the variations of the semi-major axis are most probably caused by
+classical spin-orbit coupling in the binary system, while the variations in
+orbital period are most likely caused by tidal dissipation leading to changes
+in the gravitational quadrupole moment of the companion.",1102.5646v1
+2012-07-02,Tidal effects around higher-dimensional black holes,"In four-dimensional spacetime, moons around black holes generate
+low-amplitude tides, and the energy extracted from the hole's rotation is
+always smaller than the gravitational radiation lost to infinity. Thus, moons
+orbiting a black hole inspiral and eventually merge. However, it has been
+conjectured that in higher-dimensional spacetimes orbiting bodies generate much
+stronger tides, which backreact by tidally accelerating the body outwards. This
+effect, analogous to the tidal acceleration experienced by the Earth-Moon
+system, would determine the evolution of the binary. Here, we put this
+conjecture to the test, by studying matter coupled to a massless scalar field
+in orbit around a singly-spinning rotating black hole in higher dimensions. We
+show that in dimensions larger than five the energy extracted from the black
+hole through superradiance is larger than the energy carried out to infinity.
+Our numerical results are in excellent agreement with analytic approximations
+and lend strong support to the conjecture that tidal acceleration is the rule,
+rather than the exception, in higher dimensions. Superradiance dominates the
+energy budget and moons ""outspiral""; for some particular orbital frequency, the
+energy extracted at the horizon equals the energy emitted to infinity and
+""floating orbits"" generically occur. We give an interpretation of this
+phenomenon in terms of the membrane paradigm and of tidal acceleration due to
+energy dissipation across the horizon.",1207.0504v2
+2012-08-04,"Coupled evolutions of the stellar obliquity, orbital distance, and planet's radius due to the Ohmic dissipation induced in a diamagnetic hot Jupiter around a magnetic T Tauri star","We revisit the calculation of the Ohmic dissipation in a hot Jupiter
+presented in Laine et al. (2008) by considering more realistic interior
+structures, stellar obliquity, and the resulting orbital evolution. In this
+simplified approach, the young hot Jupiter of one Jupiter mass is modelled as a
+diamagnetic sphere with a finite resistivity, orbiting across tilted stellar
+magnetic dipole fields in vacuum. Since the induced Ohmic dissipation occurs
+mostly near the planet's surface, we find that the dissipation is unable to
+significantly expand the young hot Jupiter. Nevertheless, the planet inside a
+small co-rotation orbital radius can undergo orbital decay by the dissipation
+torque and finally overfill its Roche lobe during the T Tauri star phase. The
+stellar obliquity can evolve significantly if the magnetic dipole is
+parallel/anti-parallel to the stellar spin. Our results are validated by the
+general torque-dissipation relation in the presence of the stellar obliquity.
+We also run the fiducial model in Laine et al. (2008) and find that the
+planet's radius is sustained at a nearly constant value by the Ohmic heating,
+rather than being thermally expanded to the Roche radius as suggested by the
+authors.",1208.0933v2
+2014-12-19,Fragment Model Study of Molecular Multi-Orbital System $X$[Pd(dmit)$_2$]$_2$,"Electronic properties of quasi-two-dimensional molecular conductors
+$X$[Pd(dmit)$_2$]$_2$ are studied theoretically. We construct an effective
+model based on the fragment molecular orbital scheme developed recently, which
+can describe the multi-orbital degree of freedom in this system. The
+tight-binding parameters for a series of $\beta'$-type compounds with different
+cations $X$ are evaluated by fitting to first-principles band calculations. We
+find that the transfer integrals within the dimers of Pd(dmit)$_2$ molecules,
+along the intramolecular and intermolecular bonds including the diagonal ones,
+are the same order, leading to hybridization between different molecular
+orbitals. This results in charge disproportionation within each molecule, as
+seen in our previous ab initio study [T. Tsumuraya et al, J. Phys. Soc. Jpn.
+82, 033709 (2013)], and also to a revised picture of an effective dimer model.
+Furthermore, we discuss broken-symmetry insulating states triggered by
+interaction effects, which show characteristic features owing to the
+multi-orbital nature. The on-site Coulomb interaction induces antiferromagnetic
+states with intramolecular antiparallel spin pattern, while electron-lattice
+couplings stabilize non-magnetic charge-lattice ordered states where two kinds
+of dimers with different charge occupation arrange periodically. These states
+showing different spatial patterns compete with each other as well as with the
+paramagnetic metallic state.",1412.6369v2
+2015-04-26,Charge transfer model for the electronic structure of layered ruthenates,"Motivated by the earlier experimental results and \textit{ab initio} studies
+on the electronic structure of layered ruthenates (Sr$_2$RuO$_4$ and
+Ca$_2$RuO$_4$) we introduce and investigate the multiband $d-p$ charge transfer
+model describing a single RuO$_4$ layer, similar to the charge transfer model
+for a single CuO$_2$ plane including apical oxygen orbitals in high $T_c$
+cuprates. The present model takes into account nearest-neighbor anisotropic
+ruthenium-oxygen $d-p$ and oxygen-oxygen $p-p$ hopping elements, crystal-field
+splittings and spin-orbit coupling. The intraorbital Coulomb repulsion and
+Hund's exchange are defined not only at ruthenium but also at oxygen ions. Our
+results demonstrate that the RuO$_4$ layer cannot be regarded to be a pure
+ruthenium $t_{2g}$ system. We examine a different scenario in which ruthenium
+$e_g$ orbitals are partly occupied and highlight the significance of oxygen
+orbitals. We point out that the predictions of an idealized model based on
+ionic configuration (with $n_0=4+4\times 6=28$ electrons per RuO$_4$ unit) do
+not agree with the experimental facts for Sr$_2$RuO$_4$ which support our
+finding that the electron number in the $d-p$ states is significantly smaller.
+In fact, we find the electron occupation of $d$ and $p$ orbitals for a single
+RuO$_4$ unit $n=28-x$, being smaller by at least 1--1.5 electrons from that in
+the ionic model and corresponding to self-doping with $x\simeq 1.5$.",1504.06850v1
+2015-06-29,\textit{Ab-initio} Tight-Binding Hamiltonian for Transition Metal Dichalcogenides,"We present an accurate \textit{ab-initio} tight-binding hamiltonian for the
+transition-metal dichalcogenides, MoS$_2$, MoSe$_2$, WS$_2$, WSe$_2$, with a
+minimal basis (the \textit{d} orbitals for the metal atoms and \textit{p}
+orbitals for the chalcogen atoms) based on a transformation of the Kohn-Sham
+density function theory (DFT) hamiltonian to a basis of maximally localized
+Wannier functions (MLWF). The truncated tight-binding hamiltonian (TBH), with
+only on-site, first and partial second neighbor interactions, including
+spin-orbit coupling, provides a simple physical picture and the symmetry of the
+main band-structure features. Interlayer interactions between adjacent layers
+are modeled by transferable hopping terms between the chalcogen \textit{p}
+orbitals. The full-range tight-binding hamiltonian (FTBH) can be reduced to
+hybrid-orbital k $\cdot$ p effective hamiltonians near the band extrema that
+captures important low-energy excitations. These \textit{ab-initio}
+hamiltonians can serve as the starting point for applications to interacting
+many-body physics including optical transitions and Berry curvature of bands,
+of which we give some examples.",1506.08860v3
+2016-08-19,Milankovitch Cycles of Terrestrial Planets in Binary Star Systems,"The habitability of planets in binary star systems depends not only on the
+radiation environment created by the two stars, but also on the perturbations
+to planetary orbits and rotation produced by the gravitational field of the
+binary and neighbouring planets. Habitable planets in binaries may therefore
+experience significant perturbations in orbit and spin. The direct effects of
+orbital resonances and secular evolution on the climate of binary planets
+remain largely unconsidered.
+  We present latitudinal energy balance modelling of exoplanet climates with
+direct coupling to an N Body integrator and an obliquity evolution model. This
+allows us to simultaneously investigate the thermal and dynamical evolution of
+planets orbiting binary stars, and discover gravito-climatic oscillations on
+dynamical and secular timescales.
+  We investigate the Kepler-47 and Alpha Centauri systems as archetypes of P
+and S type binary systems respectively. In the first case, Earthlike planets
+would experience rapid Milankovitch cycles (of order 1000 years) in
+eccentricity, obliquity and precession, inducing temperature oscillations of
+similar periods (modulated by other planets in the system). These secular
+temperature variations have amplitudes similar to those induced on the much
+shorter timescale of the binary period.
+  In the Alpha Centauri system, the influence of the secondary produces
+eccentricity variations on 15,000 year timescales. This produces climate
+oscillations of similar strength to the variation on the orbital timescale of
+the binary. Phase drifts between eccentricity and obliquity oscillations
+creates further cycles that are of order 100,000 years in duration, which are
+further modulated by neighbouring planets.",1608.05592v2
+2019-09-10,Electronic structures and topological properties in nickelates $Ln_{n+1}$Ni$_n$O$_{2n+2}$,"After the significant discovery of the hole-doped nickelate compound
+Nd$_{0.8}$Sr$_{0.2}$NiO$_2$, an analysis of the electronic structure, orbital
+components, Fermi surfaces and band topology could be helpful to understand the
+mechanism of its superconductivity. Based on the first-principles calculations,
+we find that Ni $3d_{x^2-y^2}$ states contribute the largest Fermi surface.
+$Ln~5d_{3z^2-r^2}$ states form an electron pocket at $\Gamma$, while $5d_{xy}$
+states form a relatively bigger electron pocket at A. These Fermi surfaces and
+symmetry characteristics can be reproduced by our two-band model, which
+consists of two elementary band representations: $B_{1g}@1a~\oplus~A_{1g}@1b$.
+We find that there is a band inversion near A, giving rise to a pair of Dirac
+points along A--M below the Fermi level once including spin-orbit coupling.
+Furthermore, we have performed the LDA+Gutzwiller calculations to treat the
+strong correlation effect of Ni 3d orbitals. In particular, the bandwidth of
+$3d_{x^2-y^2}$ has been renormalized largely. After the renormalization of the
+correlated bands, the Ni $3d_{xy}$ states and the Dirac points become very
+close to the Fermi level. Thus, a hole pocket at A could be introduced by hole
+doping, which may be related to the observed sign change of Hall coefficient.
+By introducing an additional Ni $3d_{xy}$ orbital, the hole-pocket band and the
+band inversion can be captured in our modified model. Besides, the nontrivial
+band topology in the ferromagnetic two-layer compound La$_3$Ni$_2$O$_6$ is
+discussed and the band inversion is associated with Ni $3d_{x^2-y^2}$ and La
+$5d_{xy}$ orbitals.",1909.04657v2
+2019-03-04,Obliquity-Driven Sculpting of Exoplanetary Systems,"NASA's Kepler mission revealed that $\sim 30\%$ of Solar-type stars harbor
+planets with sizes between that of Earth and Neptune on nearly circular and
+co-planar orbits with periods less than 100 days. Such short-period compact
+systems are rarely found with planet pairs in mean-motion resonances (MMRs) --
+configurations in which the planetary orbital periods exhibit a simple integer
+ratio -- but there is a significant overabundance of planet pairs lying just
+wide of the first-order resonances. Previous work suggests that tides raised on
+the planets by the host star may be responsible for forcing systems into these
+configurations by draining orbital energy to heat. Such tides, however, are
+insufficient unless there exists a substantial and as-yet unidentified source
+of extra dissipation. Here we show that this cryptic heat source may be linked
+to ""obliquity tides"" generated when a large axial tilt (obliquity) is
+maintained by secular resonance-driven spin-orbit coupling. We present evidence
+that typical compact, nearly-coplanar systems frequently experience this
+mechanism, and we highlight additional features in the planetary orbital period
+and radius distributions that may be its signatures. Extrasolar planets that
+maintain large obliquities will exhibit infrared light curve features that are
+detectable with forthcoming space missions. The observed period ratio
+distribution can be explained if typical tidal quality factors for super-Earths
+and sub-Neptunes are similar to those of Uranus and Neptune.",1903.01386v1
+2022-05-13,Isotropic orbital magnetic moments in magnetically anisotropic SrRuO3 films,"Epitaxially strained SrRuO3 films have been a model system for understanding
+the magnetic anisotropy in metallic oxides. In this paper, we investigate the
+anisotropy of the Ru 4d and O 2p electronic structure and magnetic properties
+using high-quality epitaxially strained (compressive and tensile) SrRuO3 films
+grown by machine-learning-assisted molecular beam epitaxy. The element-specific
+magnetic properties and the hybridization between the Ru 4d and O 2p orbitals
+were characterized by Ru M2,3-edge and O K-edge soft X-ray absorption
+spectroscopy and X-ray magnetic circular dichroism measurements. The
+magnetization curves for the Ru 4d and O 2p magnetic moments are identical,
+irrespective of the strain type, indicating the strong magnetic coupling
+between the Ru and O ions. The electronic structure and the orbital magnetic
+moment relative to the spin magnetic moment are isotropic despite the
+perpendicular and in-plane magnetic anisotropy in the compressive-strained and
+tensile-strained SrRuO3 films; i.e., the orbital magnetic moments have a
+negligibly small contribution to the magnetic anisotropy. This result
+contradicts Bruno model, where magnetic anisotropy arises from the difference
+in the orbital magnetic moment between the perpendicular and in-plane
+directions. Contributions of strain-induced electric quadrupole moments to the
+magnetic anisotropy are discussed, too.",2205.06563v1
+2023-08-04,S-wave pairing in a two-orbital t-J model on triangular lattice: possible application to Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O,"Recently room temperature superconductor was claimed in
+Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O (also known as LK-99) with $x\in (0.9,1.1)$.
+Density functional theory (DFT) calculations suggest that the conduction
+electrons are from the doped Cu atoms with valence close to $d^{9}$. Motivated
+by this picture, we build a two-orbital Hubbard model on a triangular lattice
+formed by the $d_{xz}$ and $d_{yz}$ orbitals with total hole density (summed
+over spin and orbital) $n=1-p$. When $p=0$, the system is in a Mott insulator
+within this model. When $p>0$, we derive a $t-J$ model and perform a
+self-consistent slave boson mean field calculation. Interestingly we find a
+s-wave pairing in contrast to the one-orbital t-J model which favors $d+id$
+pairing. S wave pairing should be more robust to disorder and may lead to high
+Tc superconductor with sufficiently large values of $t$ and $J$. However, the
+DFT calculations predict a very small value of $t$ and then the $T_c$ is
+expected to be small. If LK99 is really a high Tc superconductor, ingredients
+beyond the current model are needed. We conjecture that the doped Cu atoms may
+distort the original lattice and form local clusters with smaller Cu -Cu
+distance and thus larger values of $t$ and $J$. Within these clusters, we may
+locally apply our t-J model calculation and expect high Tc s-wave
+superconductor. Then the superconducting islands couple together, which may
+eventually become a global superconductor, an insulator or even an anomalous
+metal depending on sample details.",2308.02469v1
+2015-01-06,Spin excitations used to probe the nature of the exchange coupling in the magnetically ordered ground state of Pr$_{0.5}$Ca$_{0.5}$MnO$_{3}$,"We have used time-of-flight inelastic neutron scattering to measure the spin
+wave spectrum of the canonical half-doped manganite
+Pr$_{0.5}$Ca$_{0.5}$MnO$_{3}$, in its magnetic and orbitally ordered phase. The
+data, which cover multiple Brillouin zones and the entire energy range of the
+excitations, are compared with several different models that are all consistent
+with the CE-type magnetic order, but arise through different exchange coupling
+schemes. The Goodenough model, i.e. an ordered state comprising strong nearest
+neighbor ferromagnetic interactions along zig-zag chains with antiferromagnetic
+inter-chain coupling, provides the best description of the data, provided that
+further neighbor interactions along the chains are included. We are able to
+rule out a coupling scheme involving formation of strongly bound ferromagnetic
+dimers, i.e. Zener polarons, on the basis of gross features of the observed
+spin wave spectrum. A model with weaker dimerization reproduces the observed
+dispersion but can be ruled out on the basis of discrepancies between the
+calculated and observed structure factors at certain positions in reciprocal
+space. Adding further neighbor interactions results in almost no dimerization,
+i.e. recovery of the Goodenough model. These results are consistent with
+theoretical analysis of the degenerate double exchange model for half-doping,
+and provide a recipe for how to interpret future measurements away from
+half-doping, where degenerate double exchange models predict more complex
+ground states.",1501.01148v2
+2013-08-24,Spin-chain magnetism and uniform Dzyaloshinsky-Moriya anisotropy in BaV$_3$O$_8$,"We report on the microscopic magnetic model of a spin-1/2 magnet
+BaV$_3$O$_8$. In contrast to earlier phenomenological analysis, our
+density-functional band-structure calculations combined with quantum
+Monte-Carlo simulations establish a relatively simple and non-frustrated model
+of weakly coupled spin chains with the intrachain coupling of $J\sim$ 38 K and
+the Neel temperature of $T_N\sim$ 6 K, both in excellent agreement with the
+experiment. The intrachain coupling between the spin-1/2 V$^{+4}$ ions takes
+place via two contiguous V$^{+5}$O$_4$ tetrahedra forming an extended
+superexchange pathway with the V$^{+4}$--V$^{+4}$ distance of 7.44 A.
+Surprisingly, this pathway is preferred over shorter V$^{+4}$--V$^{+4}$
+connections, owing to peculiarities in the interacting orbitals of the magnetic
+V$^{+4}$ ions and V$^{+5}$ ions that are non-magnetic, but feature low-lying
+$3d$ states contributing to the superexchange process. We also note that the
+crystal structure of BaV$_3$O$_8$ supports the long-sought uniform arrangement
+of Dzyaloshinsky-Moriya (DM) couplings on a spin-1/2 chain. While our
+calculations yield only a weak DM anisotropy in BaV$_3$O$_8$, the crystal
+structure of this compound provides a suitable framework for the search of spin
+chains with the uniform DM anisotropy in other compounds of the vanadate
+family.",1308.5305v2
+2019-12-27,Flat bands and nontrivial topological properties in an extended Lieb lattice,"We report the appearance of multiple numbers of completely flat band states
+in an extended Lieb lattice model in two dimensions with five atomic sites per
+unit cell. We also show that this edge-centered square lattice can host
+intriguing topologically nontrivial phases when intrinsic spin-orbit (ISO)
+coupling is introduced in the microscopic description of the corresponding
+tight-binding Hamiltonian of the system. This ISO coupling strength acts like a
+complex next-nearest-neighbor hopping term for this model and can be, in
+principle, tuned in a real-life experimental setup. In the presence of this ISO
+coupling, the band spectrum of the system gets gapped out, leading to nonzero
+integer values of the spin Chern number for different bands, indicating the
+nontrivial topological properties of the system. Furthermore, we show that for
+certain values of the ISO coupling, nearly flat bands with nonzero Chern
+numbers emerge in this lattice model. This opens up the possibility of
+realizing interesting fractional quantum spin Hall physics in this model when
+interaction is taken into account. This study might be very useful in an
+analogous optical lattice experimental setup. A possible application of our
+results can also be anticipated in the field of photonics using single-mode
+photonic waveguide networks.",1912.12308v1
+2016-09-28,All-optical spin switching: A new frontier in femtomagnetism -- A short review and a simple theory,"Using an ultrafast laser pulse to manipulate the spin degree of freedom has
+broad technological appeal. It allows one to control the spin dynamics on a
+femtosecond time scale. The discipline, commonly called femtomagnetism, started
+with the pioneering experiment by Beaurepaire and coworkers in 1996, who showed
+subpicosecond demagnetization occurs in magnetic Ni thin films. This finding
+has motivated extensive research worldwide. All-optical helicity-dependent spin
+switching (AOS) represents a new frontier in femtomagnetism, where a single
+ultrafast laser pulse can permanently switch spin without any assistance from a
+magnetic field. This review summarizes some of the crucial aspects of this new
+discipline: key experimental findings, leading mechanisms, controversial
+issues, and possible future directions. The emphasis is on our latest
+investigation. We first develop the all-optical spin switching rule that
+determines how the switchability depends on the light helicity. This rule
+allows one to understand microscopically how the spin is reversed and why the
+circularly polarized light appears more powerful than the linearly polarized
+light. Then we invoke our latest spin-orbit coupled harmonic oscillator model
+to simulate single spin reversal. We consider both cw excitation and pulsed
+laser excitation. The results are in a good agreement with the experimental
+result. We then extend the code to include the exchange interaction among
+different spin sites. We show where the ""inverse Faraday field"" comes from and
+how the laser affects the spin reversal nonlinearly. Our hope is that this
+review will motivate new experimental and theoretical investigations and
+discussions.",1609.09139v2
+2023-04-11,Collinear Rashba-Edelstein effect in non-magnetic chiral materials,"Efficient generation and manipulation of spin signals in a given material
+without invoking external magnetism remain one of the challenges in
+spintronics. The spin Hall effect (SHE) and Rashba-Edelstein effect (REE) are
+well-known mechanisms to electrically generate spin accumulation in materials
+with strong spin-orbit coupling (SOC), but the exact role of the strength and
+type of SOC, especially in crystals with low symmetry, has yet to be explained.
+In this study, we investigate REE in two different families of non-magnetic
+chiral materials, elemental semiconductors (Te and Se) and semimetallic
+disilicides (TaSi$_2$ and NbSi$_2$), using an approach based on density
+functional theory (DFT). By analyzing spin textures across the full Brillouin
+zones and comparing them with REE magnitudes calculated as a function of
+chemical potential, we link specific features in the electronic structure with
+the efficiency of the induced spin accumulation. Our findings show that
+magnitudes of REE can be increased by: (i) the presence of purely radial
+(Weyl-type) spin texture manifesting as the parallel spin-momentum locking,
+(ii) high spin polarization of bands along one specific crystallographic
+direction, (iii) low band velocities. By comparing materials possessing the
+same crystal structures, but different strengths of SOC, we conclude that
+larger SOC may indirectly contribute to the enhancement of REE. It yields
+greater spin-splitting of bands along specific crystallographic directions,
+which prevents canceling the contributions from the oppositely spin-polarized
+bands over wider energy regions and helps maintain larger REE magnitudes. We
+believe that these results will be useful for designing spintronics devices and
+may aid further computational studies searching for efficient REE in materials
+with different symmetries and SOC strengths.",2304.05287v1
+2012-03-18,Hole spin relaxation in $p$-type (111) GaAs quantum wells,"Hole spin relaxation in $p$-type (111) GaAs quantum wells is investigated in
+the case with only the lowest hole subband, which is heavy-hole like in (111)
+GaAs/AlAs and light-hole like in (111) GaAs/InP quantum wells, being relevant.
+The subband L\""{o}wdin perturbation method is applied to obtain the effective
+Hamiltonian including the Dresselhaus and Rashba spin-orbit couplings. Under a
+proper gate voltage, the total in-plane effective magnetic field in (111)
+GaAs/AlAs quantum wells can be strongly suppressed in the whole momentum space,
+while the one in (111) GaAs/InP quantum wells can be suppressed only on a
+special momentum circle. The hole spin relaxation due to the D'yakonov-Perel'
+and Elliott-Yafet mechanisms is calculated by means of the fully microscopic
+kinetic spin Bloch equation approach with all the relevant scatterings
+explicitly included. For (111) GaAs/AlAs quantum wells, extremely long
+heavy-hole spin relaxation time (upto hundreds of nanoseconds) is predicted. In
+addition, we predict a pronounced peak in the gate-voltage dependence of the
+heavy-hole spin relaxation time due to the D'yakonov-Perel' mechanism. This
+peak origins from the suppression of the unique inhomogeneous broadening in
+(111) GaAs/AlAs quantum wells. Moreover, the Elliott-Yafet mechanism influences
+the spin relaxation only around the peak area due to the small spin mixing
+between the heavy and light holes in quantum wells with small well width. We
+also show the anisotropy of the spin relaxation. In (111) GaAs/InP quantum
+wells, a mild peak, similar to the case for electrons in (111) GaAs quantum
+wells, is also predicted in the gate-voltage dependence of the light-hole spin
+relaxation time. The contribution of the Elliott-Yafet mechanism is always
+negligible in this case.",1203.3931v1
+2016-07-12,Theory for Spin Selective Andreev Reflection in Vortex Core of Topological Superconductor: Majorana Zero Modes on Spherical Surface and Application to Spin Polarized Scanning Tunneling Microscope Probe,"Majorana zero modes (MZMs) have been predicted to exist in the topological
+insulator (TI)/superconductor (SC) heterostructure. Recent spin polarized
+scanning tunneling microscope (STM) experiment$^{1}$ has observed
+spin-polarization dependence of the zero bias differential tunneling
+conductance at the center of vortex core, which may be attributed to the spin
+selective Andreev reflection, a novel property of the MZMs theoretically
+predicted in 1-dimensional nanowire$^{2}$. Here we consider a helical electron
+system described by a Rashba spin orbit coupling Hamiltonian on a spherical
+surface with a s-wave superconducting pairing due to proximity effect. We
+examine in-gap excitations of a pair of vortices with one at the north pole and
+the other at the south pole. While the MZM is not a spin eigenstate, the spin
+wavefunction of the MZM at the center of the vortex core, r = 0, is parallel to
+the magnetic field, and the local Andreev reflection of the MZM is spin
+selective, namely occurs only when the STM tip has the spin polarization
+parallel to the magnetic field, similar to the case in 1-dimensional nanowire2.
+The total local differential tunneling conductance consists of the normal term
+proportional to the local density of states and an additional term arising from
+the Andreev reflection. We also discuss the finite size effect, for which the
+MZM at the north pole is hybridized with the MZM at the south pole. We apply
+our theory to examine the recently reported spin-polarized STM experiments and
+show good agreement with the experiments.",1607.03449v1
+2020-07-30,"Tunable spin Hall and spin Nernst effects in Dirac line-node semimetals XCuYAs (X=Zr, Hf; Y=Si, Ge)","The quaternary arsenide compounds XCuYAs (X=Zr, Hf; Y= Si, Ge) belong to the
+vast family of the 1111-type quaternary compounds, which possess outstanding
+physical properties ranging from $p$-type transparent semiconductors to
+high-temperature Fe-based superconductors. In this paper, we study the
+electronic structure topology, spin Hall effect (SHE) and spin Nernst effect
+(SNE) in these compounds based on density functional theory calculations. First
+we find that the four considered compounds are Dirac semimetals with the
+nonsymmorphic symmetry-protected Dirac line nodes along the Brillouin zone
+boundary $A$-$M$ and $X$-$R$ and low density of states (DOS) near the Fermi
+level ($E_F$). Second, the intrinsic SHE and SNE in some of these considered
+compounds are found to be large. In particular, the calculated spin Hall
+conductivity (SHC) of HfCuGeAs is as large as -514 ($\hbar$/e)(S/cm). The spin
+Nernst conductivity (SNC) of HfCuGeAs at room temperature is also large, being
+-0.73 ($\hbar$/e)(A/m-K). Moreover, both the magnitude and sign of the SHC and
+SNC in these compounds can be manipulated by varying either the applied
+electric field direction or spin current direction. The SHE and SNE in these
+compounds can also be enhanced by tuning the Fermi level via chemical doping or
+electric gating. Finally, a detailed analysis of the band-decomposed and
+$k$-resolved spin Berry curvatures reveals that these large SHC and SNC as well
+as their notable tunabilities originate largely from the presence of a large
+number of spin-orbit coupling-gapped Dirac points near the Fermi level as well
+as the gapless Dirac line-nodes, which give rise to large spin Berry
+curvatures. Our findings thus suggest that the four XCuYAs compounds not only
+provide a valuable platform for exploring the interplay between SHE, SNE and
+band topology but also have promising applications in spintronics and spin
+caloritronics.",2007.15303v1
+2017-07-13,Transmission Line Model for Materials with Spin-Momentum Locking,"We provide a transmission line representation for channels exhibiting
+spin-momentum locking (SML) which can be used for both time-dependent and
+steady-state transport analysis on a wide variety of materials with spin-orbit
+coupling such as topological insulators, heavy metals, oxide interfaces, and
+narrow bandgap semiconductors. This model is based on a time-dependent
+four-component diffusion equation obtained from the Boltzmann transport
+equation assuming linear response and elastic scattering in the channel. We
+classify all electronic states in the channel into four groups ($U^+$, $D^+$,
+$U^-$, and $D^-$) depending on the spin index (up ($U$), down ($D$)) and the
+sign of the $x$-component of the group velocity ($+,-$) and assign an average
+electrochemical potential to each of the four groups to obtain the
+four-component diffusion equation. For normal metal channels, the model
+decouples into the well-known transmission line model for charge and a
+time-dependent version of Valet-Fert equation for spin. We first show that in
+the steady-state limit our model leads to simple expressions for charge-spin
+interconversion in SML channels in good agreement with existing experimental
+data on diverse materials. We then use the full time-dependent model to study
+spin-charge separation in the presence of SML, a subject that has been
+controversial in the past. Our model shows that the charge and spin signals
+travel with two distinct velocities resulting in well-known spin-charge
+separation which is expected to persist even in the presence of SML. However,
+our model predicts that the lower velocity signal is purely spin while the
+higher velocity signal is largely charge with an additional spin component
+which has not been noted before. Finally, we note that our model can be used
+within standard circuit simulators like SPICE to obtain numerical results for
+complex geometries.",1707.04051v3
+2022-02-18,Rashba-induced spin texture and spin-layer-locking effects in the antiferromagnetic CrI3 bilayer,"The antiferromagnetic (AFM) CrI$_3$ bilayer is a particularly interesting
+representative of van der Waals 2D semiconductors, which are currently being
+studied for their magnetism and for their potential in spintronics. Using ab
+initio density-functional theory calculations, we investigate the spin texture
+in momentum space of the states of the (doubly degenerate) highest valence band
+of the AFM CrI$_3$ bilayer with Cr-spin moments perpendicular to the layers. We
+find the existence, in the main central part of the Brillouin zone, of a Rashba
+in-plane spin texture of opposite signs on the two layers, resulting from the
+intrinsic local electric fields acting on each layer. To study the layer
+segregation of the wavefunctions, we apply a small electric field that splits
+the degenerate states according to their layer occupancy. We find that the
+wavefunctions of the highest valence band are layer-segregated, belonging to
+only one of the two layers with opposite in-plane spin textures, and the
+segregation occurs over nearly the whole Brillouin zone. The corresponding
+layer locking of the in-plane-canted spin is related to the separation in
+energy of the highest AFM band from the rest of the valence bands. We explain
+how the band interactions destroy the layer locking at the $K$, $K'$, and
+$\Gamma$ points. Furthermore, we compare the layer locking of the
+in-plane-canted spin in our AFM bilayer system with the hidden spin
+polarization in centrosymmetric nonmagnetic materials, pointing out the
+differences in segregation mechanisms and their consequences for the layer
+locking. We note that a similar Rashba effect with layer locking of
+in-plane-canted spin could occur in other van der Waals AFM bilayers with
+strong spin-orbit coupling and an isolated energy band.",2202.09431v2
+2023-03-08,Observation of plaid-like spin splitting in a noncoplanar antiferromagnet,"Spatial, momentum and energy separation of electronic spins in condensed
+matter systems guides the development of novel devices where spin-polarized
+current is generated and manipulated. Recent attention on a set of previously
+overlooked symmetry operations in magnetic materials leads to the emergence of
+a new type of spin splitting, enabling giant and momentum-dependent spin
+polarization of energy bands on selected antiferromagnets. Despite the
+ever-growing theoretical predictions, the direct spectroscopic proof of such
+spin splitting is still lacking. Here, we provide solid spectroscopic and
+computational evidence for the existence of such materials. In the noncoplanar
+antiferromagnet MnTe$_2$, the in-plane components of spin are found to be
+antisymmetric about the high-symmetry planes of the Brillouin zone, comprising
+a plaid-like spin texture in the antiferromagnetic (AFM) ground state. Such an
+unconventional spin pattern, further found to diminish at the high-temperature
+paramagnetic state, stems from the intrinsic AFM order instead of spin-orbit
+coupling (SOC). Our finding demonstrates a new type of quadratic spin texture
+induced by time-reversal breaking, placing AFM spintronics on a firm basis and
+paving the way for studying exotic quantum phenomena in related materials.",2303.04549v3
+2023-06-22,"Gilbert damping in metallic ferromagnets from Schwinger-Keldysh field theory: Intrinsically nonlocal and nonuniform, and made anisotropic by spin-orbit coupling","Understanding the origin of damping mechanisms in magnetization dynamics of
+metallic ferromagnets is a fundamental problem for nonequilibrium many-body
+physics of systems where quantum conduction electrons interact with localized
+spins assumed to be governed by the classical Landau-Lifshitz-Gilbert (LLG)
+equation. It is also of critical importance for applications, as damping
+affects energy consumption and speed of spintronic and magnonic devices. Since
+the 1970s, a variety of linear-response and scattering theory approaches have
+been developed to produce widely used formulas for computation of
+spatially-independent Gilbert scalar parameter as the magnitude of the Gilbert
+damping term in the LLG equation. The largely unexploited for this purpose
+Schwinger-Keldysh field theory (SKFT) offers additional possibilities, such as
+to rigorously derive an extended LLG equation by integrating quantum electrons
+out. Here we derive such equation whose Gilbert damping for metallic
+ferromagnets is nonlocal, i.e., dependent on all localized spins at a given
+time, and nonuniform, even if all localized spins are collinear and spin-orbit
+coupling (SOC) is absent. This is in sharp contrast to standard lore, where
+nonlocal damping is considered to emerge only if localized spins are
+noncollinear; for such situations, direct comparison on the example of magnetic
+domain wall shows that SKFT-derived nonlocal damping is an order of magnitude
+larger than the previously considered one. Switching on SOC makes such nonlocal
+damping anisotropic, in contrast to standard lore where SOC is usually
+necessary to obtain nonzero Gilbert damping scalar parameter. Our analytical
+formulas, with their nonlocality being more prominent in low spatial
+dimensions, are fully corroborated by numerically exact quantum-classical
+simulations.",2306.13013v4
+2023-09-23,Origin of spin-driven ferroelectricity and effect of external pressure on the complex magnetism of 6H-perovskite Ba3HoRu2O9,"The compound Ba3HoRu2O9 magnetically orders at 50 K (TN1) followed by another
+complex magnetic ordering at 10 K (TN2). The 2nd magnetic phase transition was
+characterized by the co-existence of two competing magnetic ground states
+associated with two different magnetic wave vectors (K1=1/2 0 0 and K2=1/4 1/4
+0). We have investigated the compound through time-of-flight neutron
+diffraction, ac susceptibility, complex dielectric spectroscopy, and
+magnetization under external pressure. We demonstrate that the non-colinear
+structure involving two different magnetic ions, Ru(4d) and Ho(4f), breaks the
+spatial inversion symmetry via inverse Dzyaloshinskii-Moriya (D-M) interaction
+through strong4d-4f magnetic correlation, which shifts the oxygen atoms and
+results in non-zero polarization. Such an observation of inverse D-M
+interaction from two different magnetic spins ions which caused
+ferroelectricity is rarely observed. The stronger spin-orbit coupling of
+4d-orbital might play a major role in creating D-M interaction of non-collinear
+spins. We have systematically studied the spin and dipolar dynamics, which
+exhibit intriguing behavior with shorter coherence lengths of 2nd magnetic
+phase associated with the K2-wave vector. The results manifest the development
+of magnetoelectric domains instead of true long-range ordering which justifies
+the experimentally obtained low value of ferroelectric polarization. Further,
+we have investigated the effect of external pressure on this complex magnetism.
+The result reveals an enhancement of ordering temperature by the application of
+external pressure (1.6K/GPa). The external pressure might favor stabilizing the
+ground state associated with 2nd magnetic phase. Our study shows an
+unconventional mechanism of spin-driven ferroelectricity involving inverse D-M
+interaction between Ru(4d) and Ho(4f) magnetic ions due to strong 4d-4f
+cross-coupling.",2309.13465v3
+2014-08-07,Spin relaxation in a Si quantum dot due to spin-valley mixing,"We study the relaxation of an electron spin qubit in a Si quantum dot due to
+electrical noise. In particular, we clarify how the presence of conduction-band
+valleys influences spin relaxation. In single-valley semiconductor quantum
+dots, spin relaxation is through the mixing of spin and envelope orbital states
+via spin-orbit interaction. In Si, the relaxation could also be through the
+mixing of spin and valley states. We find that the additional spin relaxation
+channel, via spin-valley mixing and electrical noise, is indeed important for
+an electron spin in a Si quantum dot. By considering both spin-valley and
+intravalley spin-orbit mixings and Johnson noise in a Si device, we find that
+the spin relaxation rate peaks at the hot spot, where the Zeeman splitting
+matches the valley splitting. Furthermore, because of a weaker field
+dependence, the spin relaxation rate due to Johnson noise could dominate over
+phonon noise at low magnetic fields, which fits well with recent experiments.",1408.1666v2
+2018-04-16,Phase diagram description of the CaCu$_3$Fe$_4$O$_{12}$ double perovskite,"CaCu$_3$Fe$_4$O$_{12}$ exhibits a temperature-induced transition from a
+ferrimagnetic-insulating phase, in which Fe appears charge disproportionated,
+as Fe$^{3+}$ and Fe$^{5+}$, to a paramagnetic-metallic phase at temperatures
+above 210 K, with Fe$^{4+}$ present. To describe it, we propose a microscopic
+effective model with two interpenetrating sublattices of Fe$^{(4-\delta)+}$ and
+Fe$^{(4+\delta)+}$, respectively, being $\delta$ the Fe-charge
+disproportionation. We include all $3d$-Fe orbitals: $t_{2g}$ localized
+orbitals, with spin 3/2 and magnetically coupled, plus two degenerate itinerant
+$e_g$ orbitals with local and nearest-neighbor (NN) electron correlations, and
+hopping between NN $e_g$ orbitals of the same symmetry. Allub and Alascio
+previously proposed a model to describe the phase transition in
+LaCu$_3$Fe$_4$O$_{12}$ from a paramagnetic-metal to an
+antiferromagnetic-insulator, induced by temperature or pressure, involving
+charge transfer between Fe and Cu ions, in contrast to Fe-charge
+disproportionation. With the model proposed for CaCu$_3$Fe$_4$O$_{12}$,
+modified to account for this difference between the two compounds, the density
+of states of the itinerant Fe orbitals was obtained, using Green's functions
+methods. The phase diagram for CaCu$_3$Fe$_4$O$_{12}$ was calculated, including
+phases exhibiting Fe-charge disproportionation, where the two eg orbitals in
+each site are symmetrically occupied, as well as novel phases exhibiting local
+orbital selectivity/asymmetric occupation of $e_g$ orbitals. Both kinds of
+phases may exhibit paramagnetism and ferromagnetism. We determined the model
+parameters which best describe the phase transition observed in
+CaCu$_3$Fe$_4$O$_{12}$, and found other phases at different parameter ranges,
+which might be relevant for other compounds of the ACu$_3$Fe$_4$O$_{12}$
+family, which present both types of transitions.",1804.05726v1
+2013-10-18,Extreme orbital evolution from hierarchical secular coupling of two giant planets,"Observations of exoplanets over the last two decades have revealed a new
+class of Jupiter-size planets with orbital periods of a few days, the so-called
+""hot Jupiters"". Recent measurements using the Rossiter-McLaughlin effect have
+shown that many (~ 50%) of these planets are misaligned; furthermore, some (~
+15%) are even retrograde with respect to the stellar spin axis. Motivated by
+these observations, we explore the possibility of forming retrograde orbits in
+hierarchical triple configurations consisting of a star-planet inner pair with
+another giant planet, or brown dwarf, in a much wider orbit. Recently Naoz et
+al. (2011) showed that in such a system, the inner planet's orbit can flip back
+and forth from prograde to retrograde, and can also reach extremely high
+eccentricities. Here we map a significant part of the parameter space of
+dynamical outcomes for these systems. We derive strong constraints on the
+orbital configurations for the outer perturber that could lead to the formation
+of hot Jupiters with misaligned or retrograde orbits. We focus only on the
+secular evolution, neglecting other dynamical effects such as mean-motion
+resonances, as well as all dissipative forces. For example, with an inner
+Jupiter-like planet initially on a nearly circular orbit at 5 AU, we show that
+a misaligned hot Jupiter is likely to be formed in the presence of a more
+massive planetary companion (> 2 MJ) within 140 AU of the inner system, with
+mutual inclination 50 degrees and eccentricity above 0.25. This is in striking
+contrast to the test-particle approximation, where an almost perpendicular
+configuration can still cause large eccentricity excitations, but flips of an
+inner Jupiter-like planet are much less likely to occur. The constraints we
+derive can be used to guide future observations, and, in particular, searches
+for more distant companions in systems containing a hot Jupiter.",1310.5048v2
+2019-05-08,Updated orbital ephemeris of the ADC source X 1822-371: a stable orbital expansion over 40 years,"The source X 1822-371 is an eclipsing compact binary system with a period
+close to 5.57 hr and an orbital period derivative $\dot{P}_{\rm orb}$ of
+1.51(7)$\times 10^{-10}$ s s$^{-1}$. The very large value of $\dot{P}_{\rm
+orb}$ is compatible with a super-Eddington mass transfer rate from the
+companion star, as suggested by X-ray and optical data. The XMM-Newton
+observation taken in 2017 allows us to update the orbital ephemeris and verify
+whether the orbital period derivative has been stable over the last 40 yr. We
+added to the X-ray eclipse arrival times from 1977 to 2008 two new values
+obtained from the RXTE and XMM-Newton observations performed in 2011 and 2017,
+respectively. We estimated the number of orbital cycles and the delays of our
+eclipse arrival times spanning 40 yr using as reference time the eclipse
+arrival time obtained from the Rossi-XTE observation taken in 1996. Fitting the
+delays with a quadratic model, we found an orbital period $P_{\rm
+orb}=5.57062957(20)$ hr and a $\dot{P}_{\rm orb}$ value of $1.475(54) \times
+10^{-10}$ s s$^{-1}$. The addition of a cubic term to the model does not
+significantly improve the quality of the fit. We also determined a spin-period
+value of $P_{\rm spin}=0.5915669(4)$ s and its first derivative $\dot{P}_{\rm
+spin}= -2.595(11) \times 10^{-12}$ s s$^{-1}$. The obtained results confirm the
+scenario of a super-Eddington mass transfer rate; we also exclude a
+gravitational coupling between the orbit and the change in the oblateness of
+the companion star triggered by the nuclear luminosity of the companion star.",1905.03149v1
+2023-12-28,Chaotic Capture of a Retrograde Moon by Venus and the Reversal of Its Spin,"(Abridged) Planets are surrounded by fractal surfaces (traditionally called
+Hill spheres), separating the inner zones of long-term stable orbital motion of
+their satellites from the outer space where the gravitational pull from the Sun
+takes over. Through this surface, external minor bodies in trajectories loosely
+co-orbital to a planet can be stochastically captured by the planet without any
+assistance from external perturbative forces, and can become moons chaotically
+orbiting the planet for extended periods of time. Using state-of-the-art
+orbital integrators, we simulate such capture events for Venus, resulting in
+long-term attachment phases by reversing the forward integration of a moon
+initially attached to the planet and escaping it after an extended period of
+time. Although the probability of a long-term chaotic capture from a single
+encounter is generally low, the high density of co-orbital bodies in the
+primordial protoplanetary disk makes this outcome possible, if not probable.
+The early Venus was surrounded by a dusty gaseous disk of its own, which,
+coupled with the tidal dissipation of the kinetic energy in the moon and the
+planet, could shrink the initial orbit and stabilize the captured body within
+the Hill surface. The tidal torque from the moon, for which we use the
+historical name Neith, gradually brakes the prograde rotation of Venus, and
+then reverses it, while the orbit continues to decay. Neith eventually reaches
+the Roche radius and disintegrates, probably depositing most of its material on
+Venus' surface. Our calculations show that surface density values of about 0.06
+kg m$^{-2}$ for the debris disk may be sufficient to stabilize the initial
+chaotic orbit of Neith and to bring it down within several radii of Venus,
+where tidal dissipation becomes more efficient.",2312.17049v1
+2001-09-07,Coulomb blockade of strongly coupled quantum dots studied via bosonization of a channel with a finite barrier,"A pair of quantum dots, coupled through a point contact, can exhibit Coulomb
+blockade effects that reflect an oscillatory term in the dots' total energy
+whose value depends on whether the total number of electrons on the dots is
+even or odd. The effective energy associated with this even-odd alternation is
+reduced, relative to the bare Coulomb blockade energy for uncoupled dots, by a
+factor (1-f) that decreases as the interdot coupling is increased. When the
+transmission coefficient for interdot electronic motion is independent of
+energy and the same for all channels within the point contact (which are
+assumed uncoupled), the factor (1-f) takes on a universal value determined
+solely by the number of channels and the dimensionless conductance g of each
+individual channel.
+  This paper studies corrections to the universal value of (1-f) that result
+when the transmission coefficent varies over energy scales of the size of the
+bare Coulomb blockade energy. We consider a model in which the point contact is
+described by a single orbital channel containing a parabolic barrier potential,
+and we calculate the leading correction to (1-f) for one-channel (spin-split)
+and two-channel (spin-degenerate) point contacts in the limit where the single
+orbital channel is almost completely open. By generalizing a previously used
+bosonization technique, we find that, for a given value of the dimensionless
+conductance g, the value of (1-f) is increased relative to its value for a
+zero-thickness barrier, but the absolute value of the increase is small in the
+region where our calculations apply.",0109135v1
+2011-04-15,Formation of ultracold SrYb molecules in an optical lattice by photoassociation spectroscopy: theoretical prospects,"State-of-the-art {\em ab initio} techniques have been applied to compute the
+potential energy curves for the SrYb molecule in the Born-Oppenheimer
+approximation for the ground state and first fifteen excited singlet and
+triplet states within the coupled-cluster framework. The leading long-range
+coefficients describing the dispersion interactions at large interatomic
+distances are also reported. The electric transition dipole moments have been
+obtained as the first residue of the polarization propagator computed with the
+linear response coupled-cluster method restricted to single and double
+excitations. Spin-orbit coupling matrix elements have been evaluated using the
+multireference configuration interaction method restricted to single and double
+excitations with a large active space. The electronic structure data was
+employed to investigate the possibility of forming deeply bound ultracold SrYb
+molecules in an optical lattice in a photoassociation experiment using
+continuous-wave lasers. Photoassociation near the intercombination line
+transition of atomic strontium into the vibrational levels of the strongly
+spin-orbit mixed $b^3\Sigma^+$, $a^3\Pi$, $A^1\Pi$, and $C^1\Pi$ states with
+subsequent efficient stabilization into the $v^{\prime\prime}=1$ vibrational
+level of the electronic ground state is proposed. Ground state SrYb molecules
+can be accumulated by making use of collisional decay from $v^{\prime\prime}=1$
+to $v^{\prime\prime}=0$. Alternatively, photoassociation and stabilization to
+$v^{\prime\prime}=0$ can proceed via stimulated Raman adiabatic passage
+provided that the trapping frequency of the optical lattice is large enough and
+phase coherence between the pulses can be maintained over at least tens of
+microseconds.",1104.3015v1
+2012-09-23,Seeing Majorana fermions in time-of-flight images of spinless fermions coupled by s-wave pairing,"The Chern number, nu, as a topological invariant that identifies the winding
+of the ground state in the particle-hole space, is a definitive theoretical
+signature that determines whether a given superconducting system can support
+Majorana zero modes. Here we show that such a winding can be faithfully
+identified for any superconducting system (p-wave or s-wave with spin-orbit
+coupling) through a set of time-of-flight measurements, making it a diagnostic
+tool also in actual cold atom experiments. As an application, we specialize the
+measurement scheme for a chiral topological model of spinless fermions. The
+proposed model only requires the experimentally accessible s-wave pairing and
+staggered tunnelling that mimics spin-orbit coupling. By adiabatically
+connecting this model to Kitaev's honeycomb lattice model, we show that it
+gives rise to nu = \pm 1 phases, where vortices bind Majorana fermions, and
+nu=\pm 2 phases that emerge as the unique collective state of such vortices.
+Hence, the preparation of these phases and the detection of their Chern numbers
+provide an unambiguous signature for the presence of Majorana modes. Finally,
+we demonstrate that our detection procedure is resilient against most
+inaccuracies in experimental control parameters as well as finite temperature.",1209.5115v2
+2013-05-01,Classification of engineered topological superconductors,"I perform a complete classification of 2d, quasi-1d and 1d topological
+superconductors which originate from the suitable combination of inhomogeneous
+Rashba spin-orbit coupling, magnetism and superconductivity. My analysis
+reveals alternative types of topological superconducting platforms for which
+Majorana fermions are accessible. Specifically, I observe that for quasi-1d
+systems with Rashba spin-orbit coupling and time-reversal violating
+superconductivity, as for instance due to a finite Josephson current flow,
+Majorana fermions can emerge even in the absence of magnetism. Furthermore, for
+the classification I also consider situations where additional ""hidden""
+symmetries emerge, with a significant impact on the topological properties of
+the system. The latter, generally originate from a combination of space group
+and complex conjugation operations that separately do not leave the Hamiltonian
+invariant. Finally, I suggest alternative directions in topological quantum
+computing for systems with additional unitary symmetries.",1305.0131v3
+2013-07-30,Unconventional superconductivity in a two-dimensional repulsive gas of fermions with spin-orbit coupling,"We investigate the superconducting instability of a two-dimensional repulsive
+fermion gas with Rashba spin-orbit coupling $\al_R$. Using renormalization
+group approach, we find the superconducting transition temperature as a
+function of the dimensionless ratio $\Theta={1}{2}m\al_R^2/E_F$ where $E_F=0$
+when the smaller Fermi surface shrinks to a (Dirac) point. The general trend is
+that superconductivity is enhanced as $\Theta$ increases, but in an
+intermediate regime $\Theta\sim0.1$, a dome-like behavior appears. At a very
+small value of $\Theta$, the angular momentum channel $j_z$ in which
+superconductivity occurs is quite high. With increasing $\Theta$, $j_z$
+decreases with a step of 2 down to $j_z=6$, after which we find the sequence
+$j_z=6, 4, 6, 2$, the last value of which continues to
+$\Theta\rightarrow\infty$. In an extended range of $\Theta$, the
+superconducting gap predominantly resides on the large Fermi surface, while
+Josephson coupling induces a much smaller gap on the small Fermi surface. Below
+the superconducting transition temperature, we apply mean field theory to
+derive the self-consistent equations and find the condensation energies. The
+state with the lowest condensation energy is an unconventional superconducting
+state which breaks time reversal symmetry, and in which singlet and triplet
+pairings are mixed. In general, these states are topologically nontrivial, and
+the Chern number of the state with total angular momentum $j_z$ is $C=2j_z$.",1307.7953v1
+2013-10-24,Finite-field calculation of the polarizabilities and hyperpolarizabilities of Al$^{+}$,"In this study, accurate static dipole polarizability and hyperpolarizability
+are calculated for Al$^+$ ground state 3s$^{2}$ $^{1}$S$_{0}$ and excited state
+$3s3p$ $^{3}$P$_{J}$ with $J$=0, 1, 2. The finite-field computations use
+energies obtained with the relativistic configuration interaction approach and
+the relativistic coupled-cluster approach. Excellent agreement with previously
+recommended values is found for the dipole polarizability of Al$^{+}$ ground
+state 3s$^{2}$ $^{1}$S$_{0}$ and excited state $3s3p$ $^{3}$P$_{0}$ as well as
+the hyperpolarizability of the ground state 3s$^{2}$ $^{1}$S$_{0}$. The
+recommended values of the dipole polarizability of the Al$^{+}$ $3s3p$
+$^{3}$P$_{1}$ and $^{3}$P$_{2}$ and the hyperpolarizability of Al$^{+}$ $3s3p$
+$^{3}$P$_{0}$, $^{3}$P$_{1}$, and $^{3}$P$_{2}$ are also given. The impacts of
+the relativity and spin-orbit coupling are elucidated by analyzing the angular
+momentum dependence of the dipole polarizability and the hyperpolarizability
+and comparing the fully and scalar relativistic calculated data. It is shown
+that the impact of the relativity and spin-orbit coupling are small for the
+dipole polarizability but become significant for the hyperpolarizability.
+Finally, the black-body radiation shifts contributed by the dipole
+polarizability and hyperpolarizability respectively are evaluated for
+transitions of Al$^{+}$ 3s$^{2}$ $^{1}$S$_{0}$ to $3s3p$ $^{3}$P$_{J}$ with
+$J$=0, 1, 2.",1310.6456v3
+2015-06-16,Majorana Zero Modes in Graphene,"A clear demonstration of topological superconductivity (TS) and Majorana zero
+modes remains one of the major pending goal in the field of topological
+materials. One common strategy to generate TS is through the coupling of an
+s-wave superconductor to a helical half-metallic system. Numerous proposals for
+the latter have been put forward in the literature, most of them based on
+semiconductors or topological insulators with strong spin-orbit coupling. Here
+we demonstrate an alternative approach for the creation of TS in
+graphene/superconductor junctions without the need of spin-orbit coupling. Our
+prediction stems from the helicity of graphene's zero Landau level edge states
+in the presence of interactions, and on the possibility, experimentally
+demonstrated, to tune their magnetic properties with in-plane magnetic fields.
+We show how canted antiferromagnetic ordering in the graphene bulk close to
+neutrality induces TS along the junction, and gives rise to isolated,
+topologically protected Majorana bound states at either end. We also discuss
+possible strategies to detect their presence in graphene Josephson junctions
+through Fraunhofer pattern anomalies and Andreev spectroscopy. The latter in
+particular exhibits strong unambiguous signatures of the presence of the
+Majorana states in the form of universal zero bias anomalies. Remarkable
+progress has recently been reported in the fabrication of the proposed type of
+junctions, which offers a promising outlook for Majorana physics in graphene
+systems.",1506.04961v3
+2015-11-19,A Tight Binding Approach to Strain and Curvature in Monolayer Transition-Metal Dichalcogenides,"We present a model of the electronic properties of monolayer transition-metal
+dichalcogenides based on a tight binding approach which includes the effects of
+strain and curvature of the crystal lattice. Mechanical deformations of the
+lattice offer a powerful route for tuning the electronic structure of the
+transition-metal dichalcogenides, as changes to bond lengths lead directly to
+corrections in the electronic Hamiltonian while curvature of the crystal
+lattice mixes the orbital structure of the electronic Bloch bands. We first
+present an effective low energy Hamiltonian describing the electronic
+properties near the K point in the Brillouin zone, then present the corrections
+to this Hamiltonian due to arbitrary mechanical deformations and curvature in a
+way which treats both effects on an equal footing. This analysis finds that
+local area variations of the lattice allow for tuning of the band gap and
+effective masses, while the application of uniaxial strain decreases the
+magnitude of the direct band gap at the K point. Additionally, strain induced
+bond length modifications create a fictitious gauge field with a coupling
+strength that is smaller than that seen in related materials like graphene. We
+also find that curvature of the lattice leads to the appearance of both an
+effective in-plane magnetic field which couples to spin degrees of freedom and
+a Rashba-like spin-orbit coupling due to broken mirror inversion symmetry.",1511.06254v2
+2016-06-19,Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite,"As they combine decent mobilities with extremely long carrier lifetimes,
+organic-inorganic perovskites have opened a whole new field in
+opto\-electronics. Measurements of their underlying electronic structure,
+however, are still lacking. Using angle-resolved photoelectron spectroscopy, we
+measure the valence band dispersion of single-crystal CH$_3$NH$_3$PbBr$_3$. The
+dispersion of the highest energy band is extracted applying a modified leading
+edge method, which accounts for the particular density of states of
+organic-inorganic perovskites. The surface Brillouin zone is consistent with
+bulk-terminated surfaces both in the low-temperature orthorhombic and the
+high-temperature cubic phase. In the low-temperature phase, we find a
+ring-shaped valence band maximum with a radius of 0.043 {\AA}$^{-1}$, centered
+around a 0.16 eV deep local minimum in the dispersion of the valence band at
+the high-symmetry point. Intense circular dichroism is observed. This
+dispersion is the result of strong spin-orbit coupling. Spin-orbit coupling is
+also present in the room-temperature phase. The coupling strength is one of the
+largest reported so far.",1606.05867v3
+2014-03-18,The XYZ chain with Dzyaloshinsky-Moriya interactions: from spin-orbit-coupled lattice bosons to interacting Kitaev chains,"Using the density-matrix renormalization-group algorithm (DMRG) and a
+finite-size scaling analysis, we study the properties of the one-dimensional
+completely-anisotropic spin-1/2 XYZ model with Dzyaloshinsky-Moriya (DM)
+interactions. The model shows a rich phase diagram: depending on the value of
+the coupling constants, the system can display different kinds of ferromagnetic
+order and Luttinger-liquid behavior. Transitions from ferromagnetic to
+Luttinger-liquid phases are first order. We thoroughly discuss the transition
+between different ferromagnetic phases, which, in the absence of DM
+interactions, belongs to the XX universality class. We provide evidence that
+the DM exchange term turns out to split this critical line into two separated
+Ising-like transitions and that in between a disordered phase may appear. Our
+study sheds light on the general problem of strongly-interacting
+spin-orbit-coupled bosonic gases trapped in an optical lattice and can be used
+to characterize the topological properties of superconducting nanowires in the
+presence of an imposed supercurrent and of interactions.",1403.4568v3
+2013-09-01,Topological Uniform Superfluid and FFLO Phases in 3D to 1D crossover of spin-orbit coupled Fermi gases,"We consider the quasi-one dimensional system realized by an array of weakly
+coupled parallel one-dimensional ""tubes"" in a two-dimensional lattice which
+permits free motion of atoms in an axial direction in the presence of a Zeeman
+field, Rashba type spin orbit coupling (SOC), and an s-wave attractive
+interaction, while the radial motion is tightly confined. We solve the
+zero-temperature (T=0) Bogoliubov-de Gennes (BdG) equations for the quasi-1D
+Fermi gas with the dispersion modified by tunneling between the tubes, and show
+that the T=0 phase diagram hosts the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)
+phase with non-zero center of mass momentum Cooper pairs for small values of
+the SOC while for larger values of the SOC and high Zeeman fields the uniform
+superfluid phase with zero center of mass momentum Cooper pairs has an
+instability towards the topological uniform superfluid phase with Majorana
+fermions at the tube ends. Also, we show that tuning the two-dimensional
+optical lattice strength in this model allows one to explore the crossover
+behaviors of the phases during the transition between the 3D and the 1D system
+and in general the FFLO (for small SOC) and the topological uniform superfluid
+phase (for large SOC) are favored as the system becomes more one-dimensional.
+We also find evidence of the existence of a Zeeman tuned topological quantum
+phase transition (TQPT) within the FFLO phase itself and for large values of
+the Zeeman field and small SOC the TQPT gives rise to a topologically distinct
+FFLO phase.",1309.0258v1
+2015-12-09,Two-dimensional solitons in dipolar Bose-Einstein condensates with spin-orbit coupling,"We report families of two-dimensional (2D) composite solitons in spinor
+dipolar Bose-Einstein condensates, with two localized components linearly mixed
+by the spin-orbit coupling (SOC), and the intrinsic nonlinearity represented by
+the dipole-dipole interaction (DDI) between atomic magnetic moments polarized
+in-plane by an external magnetic field. Recently, stable solitons were
+predicted in the form of \textit{semi-vortices} (composites built of coupled
+fundamental and vortical components) in the 2D system combining the SOC and
+contact attractive interactions. Replacing the latter by the anisotropic
+long-range DDI, we demonstrate that, for a fixed norm of the soliton, the
+system supports a \emph{continuous family} of stable spatially asymmetric
+vortex solitons (AVSs), parameterized by an offset of the pivot of the vortical
+component relative to its fundamental counterpart. The offset is limited by a
+certain maximum value, while the energy of the AVS practically does not depend
+on the offset. At small values of the norm, the vortex solitons are subject to
+a weak oscillatory instability. In the present system, with the Galilean
+invariance broken by the SOC, the composite solitons are set in motion by a
+kick whose strength exceeds a certain depinning value. The kicked solitons
+feature a negative effective mass, drifting along a spiral trajectory opposite
+to the direction of the kick. A critical angular velocity, up to which the
+semi-vortices may follow rotation of the polarizing magnetic field, is found
+too.",1512.02856v2
+2016-08-25,Interplay between Rashba spin-orbit coupling and adiabatic rotation in a two-dimensional Fermi gas,"We explore the trap profiles of a two-dimensional atomic Fermi gas in the
+presence of a Rashba spin-orbit coupling and under an adiabatic rotation. We
+first consider a non-interacting gas and show that the competition between the
+effects of Rashba coupling on the local density of single-particle states and
+the Coriolis effects caused by rotation gives rise to a characteristic
+ring-shaped density profile that survives at experimentally-accessible
+temperatures. Furthermore, Rashba splitting of the Landau levels takes the
+density profiles on a ziggurat shape in the rapid-rotation limit. We then
+consider an interacting gas under the BCS mean-field approximation for local
+pairing, and study the pair-breaking mechanism that is induced by the Coriolis
+effects on superfluidity, where we calculate the critical rotation frequencies
+both for the onset of pair breaking and for the complete destruction of
+superfluidity in the system. In particular, by comparing the results of
+fully-quantum-mechanical Bogoliubov-de Gennes approach with those of
+semi-classical local-density approximation, we construct extensive phase
+diagrams for a wide-range of parameter regimes in the trap where the
+aforementioned competition may, e.g., favor an outer normal edge that is
+completely phase separated from the central superfluid core by vacuum.",1608.07110v2
+2017-12-27,Two- and one-dimensional gap solitons in spin-orbit-coupled systems with Zeeman splitting,"We elaborate a mechanism for the formation of stable solitons of the
+semi-vortex type (with vorticities 0 and 1 in their two components), populating
+a finite bandgap in the spectrum of the spin-orbit-coupled binary Bose-Einstein
+condensate with the Zeeman splitting, in the two-dimensional free space, under
+conditions which make the kinetic-energy terms in the respective coupled
+Gross-Pitaevskii equations negligible. Unlike a recent work which used
+long-range dipole-dipole interactions to construct stable gap solitons in a
+similar setting, we here demonstrate that stable solitons are supported by
+generic local interactions of both attractive and repulsive signs, provided
+that the relative strength of the cross/self interaction in the two-component
+system does not exceed a critical value ~ 0.77. A boundary between stable and
+unstable fundamental 2D gap solitons is precisely predicted by the
+Vakhitov-Kolokolov criterion, while all excited states of the 2D solitons, with
+vorticities (m, 1 + m) in the two components, m = 1, 2, ..., are unstable. The
+analysis of the one-dimensional (1D) reduction of the system produces an exact
+analytical solution for the family of gap solitons which populate the entire
+bandgap, the family being fully stable. Motion of the 1D solitons in the
+trapping potential is considered too, showing that their effective mass is
+positive or negative if the cubic nonlinearity is attractive or repulsive,
+respectively.",1712.09519v1
+2018-09-21,Inhibition of tunnelling and edge state control in polariton topological insulators,"We address the inhibition of tunnelling in polariton condensates confined in
+a potential landscape created by a honeycomb array of microcavity pillars in
+the presence of spin-orbit coupling and Zeeman splitting in the external
+magnetic field. The coupling rate between the microcavity pillars can be
+strongly impacted even by weak out-of-phase temporal modulations of the depths
+of the corresponding potential wells. When such a modulation is implemented in
+truncated honeycomb arrays that realize a polariton topological insulator,
+which supports unidirectional edge states in the presence of spin-orbit
+coupling and Zeeman splitting, it allows controlling the velocity of the
+states. The origin of the phenomenon is the dynamical modulation with a proper
+frequency, which notably changes the dispersion of the system and the group
+velocity of edge states. We show that such a control is possible for modulation
+frequencies close to resonances for inhibition of tunnelling in a two-well
+configuration. Edge states considerably slow down, and even stop completely,
+when the modulation frequency approaches a resonant value, while above such
+frequency splitting of the edge states into wavepackets moving with different
+velocities occurs.",1809.08105v1
+2019-10-16,Electronic Band Structure and Superconducting Properties of SnAs,"We report comprehensive study of physical properties of the binary
+superconductor compound SnAs. The electronic band structure of SnAs was
+investigated using both angle-resolved photoemission spectroscopy (ARPES) in a
+wide binding energy range and density functional theory (DFT) within
+generalized gradient approximation (GGA). The DFT/GGA calculations were done
+including spin-orbit coupling for both bulk and (111) slab crystal structures.
+Comparison of the DFT/GGA band dispersions with ARPES data shows that (111)
+slab much better describes ARPES data than just bulk bands. Superconducting
+properties of SnAs were studied experimentally by specific heat, magnetic
+susceptibility, magnetotransport measurements and Andreev reflection
+spectroscopy. Temperature dependences of the superconducting gap and of the
+specific heat were found to be well consistent with those expected for the
+single band BCS superconductors with an isotropic s-wave order parameter.
+Despite spin-orbit coupling is present in SnAs, our data shows no signatures of
+a potential unconventional superconductivity, and the characteristic BCS ratio
+$2\Delta/T_c = 3.48 - 3.73$ is very close to the BCS value in the weak coupling
+limit.",1910.07426v1
+2020-04-06,Realization of ideal Weyl semimetal band in ultracold quantum gas with 3D Spin-Orbit coupling,"The Weyl semimetals [1-6] are three-dimensional (3D) gapless topological
+phases with Weyl cones in the bulk band, and host massless quasiparticles known
+as Weyl fermions which were theorized by Hermann Weyl in the last twenties [7].
+The lattice theory constrains that Weyl cones must come in pairs, with the
+minimal number of cones being two. The semimetal with only two Weyl cones is an
+ideal Weyl semimetal (IWSM) which is the optimal platform to explore broad Weyl
+physics but hard to engineer in solids. Here, we report the experimental
+realization of the IWSM band by synthesising for the first time a 3D spin-orbit
+(SO) coupling for ultracold atoms. Engineering a 3D configuration-tunable
+optical Raman lattice [8], we realize the Weyl type SO coupling for ultracold
+quantum gas, with which the IWSM band is achieved with controllability. The
+topological Weyl points are clearly measured via the virtual slicing imaging
+technique [8, 9] in equilibrium, and further resolved in the quench dynamics,
+revealing the key information of the realized IWSM bands. The realization of
+the IWSM band opens an avenue to investigate various exotic phenomena based on
+the optimal Weyl semimetal platforms.",2004.02413v1
+2020-12-10,BaOsO$_3$: A Hund's metal in the presence of strong spin-orbit coupling,"We investigate the 5d transition metal oxide BaOsO$_3$ within a combination
+of density functional theory (DFT) and dynamical mean-field theory (DMFT),
+using a matrix-product-state impurity solver. BaOsO$_3$ has 4 electrons in the
+t$_{2g}$ shell akin to ruthenates but stronger spin-orbit coupling (SOC) and is
+thus expected to reveal an interplay of Hund's metal behavior with SOC. We
+explore the paramagnetic phase diagram as a function of SOC and Hubbard
+interaction strengths, identifying metallic, band (van-Vleck) insulating and
+Mott insulating regions. At the physical values of the two couplings we find
+that BaOsO$_3$ is still situated inside the metallic region and has a moderate
+quasiparticle renormalization $m^*/m \approx 2$; consistent with specific heat
+measurements. SOC plays an important role in suppressing electronic
+correlations (found in the vanishing SOC case) through the splitting of a
+van-Hove singularity (vHs) close to the Fermi energy, but is insufficient to
+push the material into an insulating van-Vleck regime. In spite of the strong
+effect of SOC, BaOsO$_3$ can be best pictured as a moderately correlated Hund's
+metal.",2012.05597v2
+2019-03-03,Full proximity treatment of topological superconductors in Josephson-junction architectures,"Experiments on planar Josephson junction architectures have recently been
+shown to provide an alternative way of creating topological superconductors
+hosting accessible Majorana modes. These zero-energy modes can be found at the
+ends of a one-dimensional channel in the junction of a two-dimensional electron
+gas (2DEG) proximitized by two spatially separated superconductors. The
+channel, which is below the break between the superconductors, is not in direct
+contact with the superconducting leads, so that proximity coupling is expected
+to be weaker and less well-controlled than in the simple nanowire configuration
+widely discussed in the literature. This provides a strong incentive for this
+paper which investigates the nature of proximitization in these Josephson
+architectures. At a microscopic level we demonstrate how and when it can lead
+to topological phases. We do so by going beyond simple tunneling models through
+solving self-consistently the Bogoliubov-de Gennes equations of a
+heterostructure multicomponent system involving two spatially separated
+$s$-wave superconductors in contact with a normal Rashba spin-orbit-coupled
+2DEG. Importantly, within our self-consistent theory we present ways of
+maximizing the proximity-induced superconducting gap by studying the effect of
+the Rashba spin-orbit coupling, chemical potential mismatch between the
+superconductor and 2DEG, and sample geometry on the gap. Finally, we note (as
+in experiment) a Fulde-Ferrell-Larkin-Ovchinnikov phase is also found to appear
+in the 2DEG channel, albeit under circumstances which are not ideal for
+topological superconducting phase.",1903.00844v2
+2020-08-07,Explicitly correlated coupled cluster method for accurate treatment of open-shell molecules with hundreds of atoms,"We present a near-linear scaling formulation of the explicitly-correlated
+coupled-cluster singles and doubles with perturbative triples method
+(CCSD(T)$_{\overline{\text{F12}}}$) for high-spin states of open-shell species.
+The approach is based on the conventional open-shell CCSD formalism [M. Saitow
+et al., J. Chem. Phys. 146, 164105 (2017)] utilizing the domain local
+pair-natural orbitals (DLPNO) framework. The use of spin-independent set of
+pair-natural orbitals ensures exact agreement with the closed-shell formalism
+reported previously, with only marginally impact on the cost (e.g. the
+open-shell formalism is only 1.5 times slower than the closed-shell counterpart
+for the $\text{C}_\text{160}\text{H}_{\text{322}}$ n-alkane, with the measured
+size complexity of $\approx1.2$). Evaluation of coupled-cluster energies near
+the complete-basis-set (CBS) limit for open-shell systems with more than 550
+atoms and 5000 basis functions is feasible on a single multi-core computer in
+less than 3 days. The aug-cc-pVTZ DLPNO-CCSD(T)$_{\overline{\text{F12}}}$
+contribution to the heat of formation for the 50 largest molecules among the
+348 core combustion species benchmark set [J. Klippenstein et al., J. Phys.
+Chem. A 121, 6580 (2017)] had root-mean-square deviation (RMSD) from the
+extrapolated CBS CCSD(T) reference values of 0.3 kcal/mol. For a more
+challenging set of 50 reactions involving small closed- and open-shell
+molecules [G. Knizia et al., J. Chem. Phys. 130, 054104 (2009)] the
+aug-cc-pVQ(+d)Z DLPNO-CCSD(T)$_{\overline{\text{F12}}}$ yielded a RMSD of
+$\sim$0.4 kcal/mol with respect to the CBS CCSD(T) estimate.",2008.03237v1
+2021-04-02,Quantum Criticality in a Layered Iridate,"Iridates provide a fertile ground to investigate correlated electrons in the
+presence of strong spin-orbit coupling. Bringing these systems to the proximity
+of a metal-insulator quantum phase transition is a challenge that must be met
+to access quantum critical fluctuations with charge and spin-orbital degrees of
+freedom. Here, electrical transport and Raman scattering measurements provide
+evidence that a metal-insulator quantum critical point is effectively reached
+in 5 % Co-doped Sr$_2$IrO$_4$ with high structural quality. The dc-electrical
+conductivity shows a linear temperature dependence that is successfully
+captured by a model involving a Co acceptor level at the Fermi energy that
+becomes gradually populated at finite temperatures, creating
+thermally-activated holes in the $J_{\text {eff}}=1/2$ lower Hubbard band. The
+so-formed quantum critical fluctuations are exceptionally heavy and the
+resulting electronic continuum couples with an optical phonon at all
+temperatures. The magnetic order and pseudospin-phonon coupling are preserved
+under the Co doping. This work brings quantum phase transitions, iridates and
+heavy-fermion physics to the same arena.",2104.01098v1
+2016-12-12,Kondo Insulator to Semimetal Transformation Tuned by Spin-Orbit Coupling,"Recent theoretical studies of topologically nontrivial electronic states in
+Kondo insulators have pointed to the importance of spin-orbit coupling (SOC)
+for stabilizing these states. However, systematic experimental studies that
+tune the SOC parameter $\lambda_{\rm{SOC}}$ in Kondo insulators remain elusive.
+The main reason is that variations of (chemical) pressure or doping strongly
+influence the Kondo coupling $J_{\text{K}}$ and the chemical potential $\mu$ --
+both essential parameters determining the ground state of the material -- and
+thus possible $\lambda_{\rm{SOC}}$ tuning effects have remained unnoticed. Here
+we present the successful growth of the substitution series
+Ce$_3$Bi$_4$(Pt$_{1-x}$Pd$_x$)$_3$ ($0 \le x \le 1$) of the archetypal
+(noncentrosymmetric) Kondo insulator Ce$_3$Bi$_4$Pt$_3$. The Pt-Pd substitution
+is isostructural, isoelectronic, and isosize, and therefore likely to leave
+$J_{\text{K}}$ and $\mu$ essentially unchanged. By contrast, the large mass
+difference between the $5d$ element Pt and the $4d$ element Pd leads to a large
+difference in $\lambda_{\rm{SOC}}$, which thus is the dominating tuning
+parameter in the series. Surprisingly, with increasing $x$ (decreasing
+$\lambda_{\rm{SOC}}$), we observe a Kondo insulator to semimetal transition,
+demonstrating an unprecedented drastic influence of the SOC. The fully
+substituted end compound Ce$_3$Bi$_4$Pd$_3$ shows thermodynamic signatures of a
+recently predicted Weyl-Kondo semimetal.",1612.03972v3
+2017-11-23,Majorana edge state in a number-conserving Fermi gas with tunable p-wave interaction,"The remarkable properties and potential applications of Majorana fermions
+have led to considerable efforts in recent years to realize topological matters
+that host these excitations. For a number-conserving system, there have been a
+few proposals, using either coupled-chain models or multi-component system with
+spin-orbit coupling, to create number fluctuation of fermion pairs in achieving
+Majorana fermion. In this work, we show that Majorana edge states can occur in
+a spinless Fermi gas in 1D lattices with tunable $p$-wave interaction. This is
+facilitated by the conversion between a pair of (open-channel) fermions and a
+(close-channel) boson, thereby allowing the number fluctuation of fermion pairs
+in a single chain. This scheme requires neither spin-orbit coupling nor
+multi-chain setup and can be implemented easily. Using the
+density-matrix-renormalization-group method, we have identified the Majorana
+phase in a wide range of parameter regime as well as its associated phase
+transitions. The topological nature of the Majorana phase manifests itself in a
+strong edge-edge correlation in an open chain that is robust against disorder,
+as well as in a non-trivial winding number in the bulk generated by using
+twisted boundary condition. It is also shown that the Majorana phase in this
+system can be stable against atom losses due to few-body collisions on the same
+site, and can be easily identified from the fermion momentum distribution.
+These results pave the way for probing the intriguing Majorana physics in a
+simple and stable cold atoms system.",1711.08765v2
+2020-03-14,Topological phase transition in layered magnetic compound MnSb2Te4: Spin-orbit coupling and interlayer coupling dependeces,"Based on the first-principles calculations and theoretical analysis, we
+investigate the electronic structures, topological phase transition (TPT) and
+topological properties of layered magnetic compound MnSb2Te4. It has the
+similar crystal and magnetic structure as the magnetic topological insulator
+MnBi2Te4. We find that when the spin-orbit coupling (SOC) is considered, the
+band structure of MnSb2Te4 in antiferromagnetic (AFM) state has no band
+inversion at {\Gamma}. This is due to the SOC strength of Sb is less than that
+of Bi. The band inversion can be realized by increasing the SOC of Sb by 0.3
+times, which drives MnSb2Te4 from a trivial AFM insulator to an AFM topological
+insulator (TI) or axion insulator. Uniaxial compressive strain along the layer
+stacking direction is another way to control the band inversion. The interlayer
+distance shorten by 5% is needed to drive the similar TPT. For the
+ferromagnetic (FM) MnSb2Te4 with experimental crystal structure, it is a normal
+FM insulator. The band inversion can happen when SOC is enhanced by 0.1 times
+or the interlayer distance is decreased by more than 1%. Thus, FM MnSb2Te4 can
+be tuned to be the simplest type-I Weyl semimetal with only one pair of Weyl
+nodes on the three-fold rotational axis. These two Weyl nodes are projected
+onto (1-10) surface with one Fermi arc connecting them.",2003.06553v1
+2021-05-21,InSbAs two-dimensional electron gases as a platform for topological superconductivity,"Topological superconductivity can be engineered in semiconductors with strong
+spin-orbit interaction coupled to a superconductor. Experimental advances in
+this field have often been triggered by the development of new hybrid material
+systems. Among these, two-dimensional electron gases (2DEGs) are of particular
+interest due to their inherent design flexibility and scalability. Here we
+discuss results on a 2D platform based on a ternary 2DEG (InSbAs) coupled to
+in-situ grown Aluminum. The spin-orbit coupling in these 2DEGs can be tuned
+with the As concentration, reaching values up to 400 meV$\unicode{xC5}$, thus
+exceeding typical values measured in its binary constituents. In addition to a
+large Land\'e g-factor $\sim$ 55 (comparable to InSb), we show that the clean
+superconductor-semiconductor interface leads to a hard induced superconducting
+gap. Using this new platform we demonstrate the basic operation of
+phase-controllable Josephson junctions, superconducting islands and quasi-1D
+systems, prototypical device geometries used to study Majorana zero modes.",2105.10437v2
+2021-07-16,An upper and lower bound to the orientation-dependent linear Rashba spin-orbit coupling of two-dimensional hole gases in semiconductor quantum wells,"Our recent study [Phys. Rev. B 103, 085309 (2021)] verified the existence of
+$\bf{k}$-linear Rashba spin-orbit coupling (SOC) of two-dimensional hole gases
+in quantum wells (QWs) which originates from a combination of
+heavy-hole-light-hole (HH-LH) mixing and direct dipolar coupling to the
+external electric field. However, the Rashba SOC dependence on QW orientations
+remains unclear. Here, we explore this dependence on QW orientations and
+uncover an upper and lower bound to the orientation-dependent $\bf{k}$-linear
+Rashba SOC along the [110]- and [111]- crystalline directions by performing
+atomistic pseudopotential calculations associated with theoretical analysis.
+The intrinsic HH-LH mixing at the Brillouin zone center, maximal in
+[110]-oriented quantum wells and minimal in [111]- and [001]-oriented QWs,
+plays an essential role. Remarkably, we find that only $\bf{k}$-cubic Rashba
+SOC exists in [111]-oriented QWs. These findings help understand the physical
+mechanism of the Rashba SOC dependence on QW orientations and provide a
+strategic prediction for experiments to realize the large Rashba SOC.",2107.07681v2
+2022-05-06,Magnetic frustration in the cubic double perovskite Ba2NiIrO6,"Hybrid transition metal oxides continue to attract attention due to their
+multiple degrees of freedom ($e.g.$, lattice, charge, spin, and orbital) and
+versatile properties. Here we investigate the magnetic and electronic
+properties of the newly synthesized double perovskite Ba$_2$NiIrO$_6$, using
+crystal field theory, superexchange model analysis, density functional
+calculations, and parallel tempering Monte Carlo (PTMC) simulations. Our
+results indicate that Ba$_2$NiIrO$_6$ has the Ni$^{2+}$
+($t_{2g}^{6}e_{g}^{2}$)-Ir$^{6+}$ ($t_{2g}^{3}$) charge states. The first
+nearest-neighboring (1NN) Ni$^{2+}$-Ir$^{6+}$ ions prefer a ferromagnetic (FM)
+coupling as expected from the Goodenough-Kanamori-Anderson rules, which
+contradicts the experimental antiferromagnetic (AF) order in Ba$_2$NiIrO$_6$.
+We find that the strong 2NN AF couplings are frustrated in the fcc sublattices,
+and they play a major role in determining the observed AF ground state. We also
+prove that the $J_{\rm eff}$ = 3/2 and $J_{\rm eff}$ = 1/2 states induced by
+spin-orbit coupling, which would be manifested in low-dimensional (e.g.,
+layered) iridates, are however not the case for cubic Ba$_2$NiIrO$_6$. Our PTMC
+simulations show that when the long-range (2NN and 3NN) AF interactions are
+included, an AF transition with $T_{\rm N}$ = 66 K would be obtained and it is
+well comparable with the experimental 51 K. Meanwhile, we propose a possible
+2$\times$2$\times$2 noncollinear AF structure for Ba$_2$NiIrO$_6$.",2205.03049v1
+2023-06-06,Possible $S_\pm$-wave superconductivity in La$_3$Ni$_2$O$_7$,"Recently, the bulk nickelate La$_3$Ni$_2$O$_7$ is reported to show signature
+of high-temperature superconductivity under high pressure above $14$GPa [H. Sun
+et al., Nature 621, 493 (2023)]. We analyze the pairing mechanism and pairing
+symmetry in a bilayer Hubbard model with two orbitals in the $E_g$ multiplet.
+In the weak to moderate interaction regime, our functional renormalization
+group (FRG) calculations yield $S_\pm$-wave Cooper pairing triggered by leading
+spin fluctuations. The gap function changes sign across the Fermi pockets, and
+in real space the pairing is dominated by intra-unitcell intra-orbital
+components with antiphase between the onsite ones. In the strong coupling
+limit, we develop a low-energy effective theory in terms of atomic one- and
+two-electron states in the $E_g$ multiplet. The variational treatment of the
+effective theory produces results consistent with the FRG ones, suggesting the
+robustness of such a pairing function. The driving force for superconductivity
+in the strong coupling limit can be attributed to the local pair-hopping term
+and the spin-exchange on vertical bonds. We also discuss a possible scenario
+for the weak insulating behavior under low pressures in terms of the tendency
+toward the formation of charge order in the strong coupling limit.",2306.03706v3
+2024-02-15,Doping induced multiferroicity and quantum anomalous Hall effect in $α$-In$_2$Se$_3$ thin films,"In flat-band materials, the strong Coulomb interaction between electrons can
+lead to exotic physical phenomena. Recently, $\alpha$-In$_2$Se$_3$ thin films
+were found to possess ferroelectricity and flat bands. In this work, using
+first-principles calculations, we find that for the monolayer, there is a Weyl
+point at $\Gamma$ in the flat band, where the inclusion of the spin-orbit
+coupling opens a gap. Shifting the Fermi level into the spin-orbit gap gives
+rise to nontrivial band topology, which is preserved for the bilayer regardless
+of the interlayer polarization couplings. We further calculate the Chern number
+and edge states for both the monolayer and bilayer, for which the results
+suggest that they become quantum anomalous Hall insulators under appropriate
+dopings. Moreover, we find that the doping-induced magnetism for In$_2$Se$_3$
+bilayer is strongly dependent on the interlayer polarization coupling.
+Therefore, doping the flat bands in In$_2$Se$_3$ bilayer can also yield
+multiferroicity, where the magnetism is electrically tunable as the system
+transforms between different polarization states. Our study thus reveals that
+multiferroicity and nontrivial band topology can be unified into one material
+for designing multifunctional electronic devices.",2402.09770v1
+2019-08-05,"Preparing single SiV$^{-}$ center in nanodiamonds for external, optical coupling with access to all degrees of freedom","Optical coupling enables intermediate- and long-range interactions between
+distant quantum emitters. Such interaction may be the basic element in
+bottom-up approaches of coupled spin systems or for integrated quantum
+photonics and quantum plasmonics. Here, we prepare nanodiamonds carrying
+single, negatively-charged silicon-vacancy centers for evanescent optical
+coupling with access to all degrees of freedom by means of atomic force
+nanomanipulation. The color centers feature excellent optical properties,
+comparable to silicon-vacancy centers in bulk diamond, resulting in a
+resolvable fine structure splitting, a linewidth close to the Fourier-Transform
+limit under resonant excitation and a good polarization contrast. We determine
+the orbital relaxation time $T_{1}$ of the orbitally split ground states and
+show that all optical properties are conserved during translational
+nanomanipulation. Furthermore, we demonstrate the rotation of the nanodiamonds.
+In contrast to the translational operation, the rotation leads to a change in
+polarization contrast. We utilize the change in polarization contrast before
+and after nanomanipulation to determine the rotation angle. Finally, we
+evaluate the likelihood for indistinguishable, single photon emission of
+silicon-vacancy centers located in different nanodiamonds. Our work enables
+ideal evanescent, optical coupling of distant nanodiamonds containing
+silicon-vacancy centers with applications in the realization of quantum
+networks, quantum repeaters or complex quantum systems.",1908.01591v2
+2016-10-10,Hallmarks of Hund's coupling in the Mott insulator Ca$_2$RuO$_4$,"A paradigmatic case of multi-band Mott physics including spin-orbit and
+Hund's coupling is realised in Ca$_2$RuO$_4$. Progress in understanding the
+nature of this Mott insulating phase has been impeded by the lack of knowledge
+about the low-energy electronic structure. Here we provide -- using
+angle-resolved photoemission electron spectroscopy -- the band structure of the
+paramagnetic insulating phase of Ca$_2$RuO$_4$ and show how it features several
+distinct energy scales. Comparison to a simple analysis of atomic multiplets
+provides a quantitative estimate of the Hund's coupling $J=0.4$ eV.
+Furthermore, the experimental spectra are in good agreement with electronic
+structure calculations performed with Dynamical Mean-Field Theory. The crystal
+field stabilisation of the d$_{xy}$ orbital due to $c$-axis contraction is
+shown to be important in explaining the nature of the insulating state. It is
+thus a combination of multiband physics, Coulomb interaction and Hund's
+coupling that generates the Mott insulating state of Ca$_2$RuO$_4$. These
+results underscore the importance of Hund's coupling in the ruthenates and
+related multiband materials.",1610.02854v1
+2023-04-26,Critical Cavity-Magnon Polariton Mediated Strong Long-Distance Spin-Spin Coupling,"Strong long-distance spin-spin coupling is desperately demanded for
+solid-state quantum information processing, but it is still challenged. Here,
+we propose a hybrid quantum system, consisting of a coplanar waveguide (CPW)
+resonator weakly coupled to a single nitrogen-vacancy spin in diamond and a
+yttrium-iron-garnet (YIG) nanosphere holding Kerr magnons, to realize strong
+long-distance spin-spin coupling. With a strong driving field on magnons, the
+Kerr effect can squeeze magnons, and thus exponentially enhance the coupling
+between the CPW resonator and the squeezed magnons, which produces two
+cavity-magnon polaritons, i.e., the high-frequency polariton (HP) and
+low-frequency polariton (LP). When the enhanced cavity-magnon coupling
+approaches to the critical value, the spin is fully decoupled from the HP,
+while the coupling between the spin and the LP is significantly improved. In
+the dispersive regime, a strong spin-spin coupling is achieved with accessible
+parameters, and the coupling distance can be up to $\sim$cm. Our proposal
+provides a promising way to manipulate remote solid spins and perform quantum
+information processing in weakly coupled hybrid systems.",2304.13553v2
+2016-02-08,"Gap opening and large spin-orbit splitting in MX2 (M=Mo,W X=S,Se,Te) from the interplay between crystal field and hybridizations: insights from ab-initio theory","By means of first-principles density functional calculations, we study the
+maximally localized Wannier functions for the 2D transition metal
+dichalcogenides MX2 (M=Mo,W X=S,Se,Te). We found a M^+4-like ionic charge and a
+single occupied d-band. The center of the d-like maximally localized Wannier
+function associated with this band is distributed among three M sites. Part of
+the energy gap is opened by the crystal field splitting induced by the
+X^-2-like atoms. We extract the hopping parameters for the Wannier functions
+and provide a perspective on tight-binding model. From the analysis of the
+tight binding model, we have found an inversion of the band character between
+the Gamma and the K points of the Brillouin zone due to the M-M hybridization.
+The consequence of this inversion is the closure of the gap. The M-X
+hybridization is the only one that tends to open the gap at every k-point, the
+change in the M-X and M-M hybridization is the main responsible for the
+difference in the gap between the different dichalcogenide materials. The
+inversion of the bands gives rise to different spin-orbit splitting at Gamma
+and K point in the valence band. The different character of the gap at Gamma
+and K point offers the chance to manipulate the semiconductive properties of
+these compounds. For a bilayer system, the hybridizations between the out of
+plane orbitals and the hybridizations between the in plane orbitals split the
+valence band respectively at the Gamma and K point. The splitting in the
+valence band is opened also without spin-orbit coupling and comes from the M-M
+and X-X hybridization between the two monolayers.",1602.02625v1
+2008-03-17,Anisotropic spin transport in two-terminal mesoscopic rings: the Rashba and Dresselhaus spin-orbit interactions,"We investigate theoretically the spin transport in two-terminal mesoscopic
+rings in the presence of both the Rashba spin-orbit interaction (RSOI) and the
+Dresselhaus spin-orbit interaction (DSOI). We find that the interplay between
+the RSOI and DSOI breaks the original cylindric symmetry of mesoscopic ring and
+consequently leads to the anisotropic spin transport, i.e., the conductance is
+sensitive to the positions of the incoming and outgoing leads. The anisotropic
+spin transport can survive even in the presence of disorder caused by impurity
+elastic scattering in a realistic system.",0803.2408v1
+2010-09-28,Spin-orbit anisotropy measured using ballistic spin resonance,"Spin relaxation can be greatly enhanced in narrow channels of two-dimensional
+electron gas due to ballistic spin resonance, which is mediated by spin-orbit
+interaction for trajectories that bounce rapidly between channel walls. The
+channel orientation determines which momenta affect the relaxation process, so
+comparing relaxation for two orientations provides a direct determination of
+spin-orbit anisotropy. Electrical measurements of pure spin currents are shown
+to reveal an order of magnitude stronger relaxation for channels fabricated
+along the [110] crystal axis in a GaAs electron gas compared to [-110]
+channels, believed to result from interference between structural and bulk
+inversion asymmetries.",1009.5702v1
+2013-10-02,Spin snake states with spin-orbit and Zeeman interactions in an inhomogeneous magnetic field,"We study the spin edge states, induced by the combined effect of
+Bychkov-Rashba spin-orbit, Zeeman interactions and inhomogeneous magnetic
+field, exposed perpendicularly to two-dimensional electron systems. We
+calculate analytically the spectrum of the spin edge states (the spin snakes
+orbits) in systems where the magnetic field exhibits a discontinuous jump in
+the transverse direction and changes its sign at the magnetic interface. The
+obtained magnetic spin edge states in a 2DES exhibit several interesting
+properties: in particular, electrons reverse their propagation direction at
+finite values of their momentum.",1310.0571v1
+2013-11-13,Spin current source based on a quantum point contact with local spin-orbit interaction,"Proposal for construction of a source of spin-polarized current based on
+quantum point contact with local spin-orbit interaction is presented. We show
+that spin-orbit interaction present within the narrowing acts like a spin
+filter. The spin polarization of the current is discussed as a function of the
+Fermi energy and the width of the quantum point contact.",1311.3065v1
+2003-06-06,Maximized Orbital and Spin Kondo effects in a single-electron transistor,"We investigate the charge fluctuations of a single-electron box (metallic
+grain) coupled to a lead via a smaller quantum dot in the Kondo regime. The
+most interesting aspect of this problem resides in the interplay between spin
+Kondo physics stemming from the screening of the spin of the small dot and
+orbital Kondo physics emerging when charging states of the grain with (charge)
+Q=0 and Q=e are almost degenerate. Combining Wilson's numerical
+renormalization-group method with perturbative scaling approaches we push
+forward our previous work [K. Le Hur and P. Simon, Phys. Rev. B 67, 201308R
+(2003)]. We emphasize that for symmetric and slightly asymmetric barriers, the
+strong entanglement of charge and spin flip events in this setup inevitably
+results in a non trivial stable SU(4) Kondo fixed point near the degeneracy
+points of the grain. By analogy with a small dot sandwiched between two leads,
+the ground state is Fermi-liquid like which considerably smears out the Coulomb
+staircase behavior and hampers the Matveev logarithmic singularity to arise.
+Most notably, the associated Kondo temperature $T_K^{SU(4)}$ might be raised
+compared to that in the conductance experiments through a small quantum dot
+$(\sim 1K)$ which makes the observation of our predictions a priori accessible.
+We discuss the robustness of the SU(4) correlated state against the inclusion
+of an external magnetic field, a deviation from the degeneracy points,
+particle-hole symmetry in the small dot, asymmetric tunnel junctions and
+comment on the different crossovers.",0306186v1
+2003-07-22,Hidden Symmetries and their Consequences in $t_{2g}$ Cubic Perovskites,"The five-band Hubbard model for a $d$ band with one electron per site is a
+model which has very interesting properties when the relevant ions are located
+at sites with high (e. g. cubic) symmetry. In that case, if the crystal field
+splitting is large one may consider excitations confined to the lowest
+threefold degenerate $t_{2g}$ orbital states. When the electron hopping matrix
+element ($t$) is much smaller than the on-site Coulomb interaction energy
+($U$), the Hubbard model can be mapped onto the well-known effective
+Hamiltonian (at order $t^{2}/U$) derived by Kugel and Khomskii (KK). Recently
+we have shown that the KK Hamiltonian does not support long range spin order at
+any nonzero temperature due to several novel hidden symmetries that it
+possesses. Here we extend our theory to show that these symmetries also apply
+to the underlying three-band Hubbard model. Using these symmetries we develop a
+rigorous Mermin-Wagner construction, which shows that the three-band Hubbard
+model does not support spontaneous long-range spin order at any nonzero
+temperature and at any order in $t/U$ -- despite the three-dimensional lattice
+structure. Introduction of spin-orbit coupling does allow spin ordering, but
+even then the excitation spectrum is gapless due to a subtle continuous
+symmetry. Finally we showed that these hidden symmetries dramatically simplify
+the numerical exact diagonalization studies of finite clusters.",0307515v1
+2008-02-22,Study of Short-distance Spin and Charge Correlations and Local Density-of-States in the CMR regime of the One-Orbital Model for Manganites,"The metal-insulator transition, and the associated magnetic transition, in
+the colossal magnetoresistance (CMR) regime of the one-orbital model for
+manganites is here studied using Monte Carlo (MC) techniques. Both cooperative
+oxygen lattice distortions and a finite superexchange coupling among the
+$t_{\rm 2g}$ spins are included in our investigations. Charge and spin
+correlations are studied. In the CMR regime, a strong competition between the
+ferromagnetic metallic and antiferromagnetic charge-ordered insulating states
+is observed. This competition is shown to be important to understand the
+resistivity peak that appears near the critical temperature. Moreover, it is
+argued that the system is dynamically inhomogeneous, with short-range charge
+and spin correlations that slowly evolve with MC time, producing the glassy
+characteristics of the CMR state. The local density-of-states (LDOS) is also
+investigated, and a pseudogap (PG) is found to exist in the CMR temperature
+range. The width of the PG in the LDOS is calculated and directly compared with
+recent scanning-tunneling-spectroscopy (STS) experimental results. The
+agreement between our calculation and the experiment suggests that the
+depletion of the conductance at low bias observed experimentally is a
+reflection on the existence of a PG in the LDOS spectra, as opposed to a hard
+gap. The apparent homogeneity observed via STS techniques could be caused by
+the slow time characteristics of this probe. Faster experimental methods should
+unveil a rather inhomogeneous state in the CMR regime, as already observed in
+neutron scattering experiments.",0802.3382v1
+2013-02-07,Interaction-driven transition between topological states in a Kondo insulator,"Heavy fermion materials naturally combine strong spin-orbit interactions and
+electronic correlations. When there is precisely one conduction electron per
+impurity spin, the coherent heavy fermion state is insulating. This Kondo
+insulating state has recently been argued to belong to the class of quantum
+spin Hall states. Motivated by this conjecture and a very recent experimental
+realization of this state, we investigate a model for Kondo insulators with
+spin-orbit coupling. Using DMFT, we observe an interaction-driven transition
+between two distinct topological states, indicated by a closing of the bulk gap
+and a simultaneous change of the Z2 topological invariant. At large interaction
+strength we find a topological heavy fermion state, characterized by strongly
+renormalized heavy bulk bands, hosting a pair of zero-energy edge modes. The
+model allows a detailed understanding of the temperature dependence of the
+single particle spectral function and in particular the energy scales at which
+one observes the appearance of edge states within the bulk gap.",1302.1874v3
+2013-06-13,From antiferromagnetic order to magnetic textures in the two dimensional Fermi Hubbard model with synthetic spin orbit interaction,"We study the interacting Fermi-Hubbard model in two spatial dimensions with
+synthetic gauge coupling of the spin orbit Rashba type, at half-filling. Using
+real space mean field theory, we numerically determine the phase as a function
+of the interaction strength for different values of the gauge field parameters.
+For a fixed value of the gauge field, we observe that when the strength of the
+repulsive interaction is increased, the system enters into an antiferromagnetic
+phase, then undergoes a first order phase transition to an non collinear
+magnetic phase. Depending on the gauge field parameter, this phase further
+evolves to the one predicted from the effective Heisenberg model obtained in
+the limit of large interaction strength. We explain the presence of the
+antiferromagnetic phase at small interaction from the computation of the
+spin-spin susceptibility which displays a divergence at low temperatures for
+the antiferromagnetic ordering. We discuss, how the divergence is related to
+the nature of the underlying Fermi surfaces. Finally, the fact that the first
+order phase transitions for different gauge field parameters occur at unrelated
+critical interaction strengths arises from a Hofstadter-like situation, i.e.
+for different magnetic phases, the mean-field Hamiltonians have different
+translational symmetries.",1306.3124v2
+2014-09-12,The dynamics of a doped hole in cuprates is not controlled by spin fluctuations,"Twenty seven years after the discovery of high-temperature superconductivity
+\cite{BedMu}, consensus on its theoretical explanation is still absent. To a
+good extent, this is due to the difficulty of studying strongly correlated
+systems near half-filling, needed to understand the behaviour of one or few
+holes doped into a CuO$_2$ layer. To simplify this task it is customary to
+replace three-band models \cite{Emery} describing the doping holes as entering
+the O $2p$ orbitals of these charge-transfer insulators \cite{ZSA} with much
+simpler one-band Hubbard or $tJ$ models \cite{rev1,rev2}. Here we challenge
+this approach, showing that not only is the dynamics of a doped hole easier to
+understand in models that explicitly include the O orbitals, but also that our
+solution contradicts the long-held belief that the quantum spin fluctuations of
+the antiferromagnetic (AFM) background play a key role in determining this
+dynamics. Indeed, we show that the correct, experimentally observed dispersion
+is generically obtained for a hole moving on the O sublattice, and coupled to a
+N\'eel lattice of spins without spin fluctuations. This marks a significant
+conceptual change in our understanding of the relevant phenomenology and opens
+the way to studying few-holes dynamics without finite-size effect issues
+\cite{BayoB}, to understand the actual strength of the ""magnetic glue"".",1409.3647v1
+2015-06-03,Antidamping spin-orbit torque driven by spin-flip reflection mechanism on the surface of a topological insulator: A time-dependent nonequilibrium Green function approach,"Motivated by recent experiments observing spin-orbit torque (SOT) acting on
+the magnetization $\vec{m}$ of a ferromagnetic (F) overlayer on the surface of
+a three-dimensional topological insulator (TI), we investigate the origin of
+the SOT and the magnetization dynamics in such systems. We predict that lateral
+F/TI bilayers of finite length, sandwiched between two normal metal leads, will
+generate a large antidamping-like SOT per very low charge current injected
+parallel to the interface. The large values of antidamping-like SOT are {\it
+spatially localized} around the transverse edges of the F overlayer. Our
+analysis is based on adiabatic expansion (to first order in $\partial
+\vec{m}/\partial t$) of time-dependent nonequilibrium Green functions (NEGFs),
+describing electrons pushed out of equilibrium both by the applied bias voltage
+and by the slow variation of a classical degree of freedom [such as
+$\vec{m}(t)$]. From it we extract formulas for spin torque and charge pumping,
+which show that they are reciprocal effects to each other, as well as Gilbert
+damping in the presence of SO coupling. The NEGF-based formula for SOT
+naturally splits into four components, determined by their behavior (even or
+odd) under the time and bias voltage reversal. Their complex angular dependence
+is delineated and employed within Landau-Lifshitz-Gilbert simulations of
+magnetization dynamics in order to demonstrate capability of the predicted SOT
+to efficiently switch $\vec{m}$ of a perpendicularly magnetized F overlayer.",1506.01303v3
+2016-06-11,"Conetronics in 2D Metal-Organic Frameworks: Double Dirac Cones, Magnetic Half Dirac Cones and Quantum Anomalous Hall Effect","Based on recently synthesized Ni3C12S12 class 2D metal-organic frameworks, we
+predict electronic properties of M3C12S12 and M3C12O12, where M is Zn, Cd, Hg,
+Be, or Mg with no M orbital contributions to bands near Fermi level. For
+M3C12S12, their band structures exhibit double Dirac cones with different Fermi
+velocities that are n and p type, respectively, which are switchable by
+few-percent strain. The crossing of two cones are symmetry-protected to be
+non-hybridizing, leading to two independent channels in 2D node-line semimetals
+at the same k-point akin to spin-channels in spintronics, rendering conetronics
+device possible. The node line rings right at their crossing, which are both
+electron and hole pockets at the Fermi level, can give rise to
+magnetoresistance that will not saturate when the magnetic field is infinitely
+large, due to perfect n-p compensation. For M3C12O12, together with conjugated
+metal-tricatecholate polymers M3(HHTP)2, the spin-polarized slow Dirac cone
+center is pinned precisely at the Fermi level, making the systems conducting in
+only one spin or cone channel. Quantum anomalous Hall effect can arise in MOFs
+with non-negligible spin-orbit coupling like Cu3C12O12. Compounds of M3C12S12
+and M3C12O12 with different M, can be used to build spintronic and
+cone-selecting heterostructure devices, tunable by strain or electrostatic
+gating.",1606.04094v1
+2018-02-20,Asymmetric skyrmion Hall effect in systems with a hybrid Dzyaloshinskii-Moriya interaction,"We examine the current-induced dynamics of a skyrmion that is subject to both
+structural and bulk inversion asymmetry. There arises a hybrid type of
+Dzyaloshinskii-Moriya interaction (DMI) which is in the form of a mixture of
+interfacial and bulk DMIs. Examples include crystals with symmetry classes
+C$_n$ as well as magnetic multilayers composed of a ferromagnet with a
+noncentrosymmetric crystal and a nonmagnet with strong spin-orbit coupling. As
+a striking result, we find that, in systems with a hybrid DMI, the
+spin-orbit-torque-induced skyrmion Hall angle is asymmetric for the two
+different skyrmion polarities ($\pm 1$ given by out-of-plane core
+magnetization), even allowing one of them to be tuned to zero. We propose
+several experimental ways to achieve the necessary straight skyrmion motion
+(with zero Hall angle) for racetrack memories, even without antiferromagnetic
+interactions or any interaction with another magnet. Our results can be
+understood within a simple picture by using a global spin rotation which maps
+the hybrid DMI model to an effective model containing purely interfacial DMI.
+The formalism directly reveals the effective spin torque and effective current
+that result in qualitatively different dynamics. Our work provides a way to
+utilize symmetry breaking to eliminate detrimental phenomena as hybrid DMI
+eliminates the skyrmion Hall angle.",1802.07327v2
+2018-03-31,Understanding current-driven dynamics of magnetic Néel walls in heavy metal/ferromagnetic metal/oxide trilayers,"We consider analytically current-driven dynamics of magnetic N\'{e}el walls
+in heavy metal/ferromagnetic metal/oxide trilayers where strong spin-orbit
+coupling and interfacial Dzyaloshinskii-Moriya interaction (i-DMI) coexist. We
+show that field-like spin-orbit torque (FL-SOT) with effective field along
+$\mathbf{n}\times\hat{\mathbf{J}}$ ($\mathbf{n}$ being the interface normal and
+$\hat{\mathbf{J}}$ being the charge current direction) and i-DMI induced torque
+can both lead to Walker breakdown suppression meanwhile leaving the wall
+mobility (velocity versus current density) unchanged. However, i-DMI itself can
+not induce the ""universal absence of Walker breakdown"" (UAWB) while FL-SOT
+exceeding a certain threshold can. Finitely-enlarged Walker limits before UAWB
+are theoretically calculated and well explain existing data. In addition,
+change in wall mobility and even its sign-inversion can be understood only if
+the anti-damping-like (ADL) SOT is appended. For N\'{e}el walls in
+ferromagnetic-metal layer with both perpendicular and in-plane anisotropies, we
+have calculated the respective modifications of wall mobility under the
+coexistence of spin-transfer torque, SOTs and i-DMI. Analytics shows that in
+trilayers with perpendicular anisotropy strong enough spin Hall angle and
+appropriate sign of i-DMI parameter can lead to sign-inversion in wall mobility
+even under small enough current density, while in those with in-plane
+anisotropy this only occurs for current density in a specific range.",1804.00127v4
+2010-05-11,Spin susceptibility of interacting two-dimensional electrons in the presence of spin-orbit coupling,"A long-range interaction via virtual particle-hole pairs between Fermi-liquid
+quasiparticles leads to a nonanalytic behavior of the spin susceptibility
+$\chi$ as a function of the temperature ($T$), magnetic field ($\mathbf{B}$),
+and wavenumber. In this paper, we study the effect of the Rashba spin-orbit
+interaction (SOI) on the nonanalytic behavior of $\chi$ for a two-dimensional
+electron liquid. Although the SOI breaks the SU(2) symmetry, it does not
+eliminate nonanalyticity but rather makes it anisotropic: while the linear
+scaling of $\chi_{zz}$ with $T$ and $|\mathbf{B}|$ saturates at the energy
+scale set by the SOI, that of $\chi_{xx}$ ($=\chi_{yy}$) continues through this
+energy scale, until renormalization of the electron-electron interaction in the
+Cooper channel becomes important. We show that the Renormalization Group flow
+in the Cooper channel has a non-trivial fixed point, and study the consequences
+of this fixed point for the nonanalytic behavior of $\chi$. An immediate
+consequence of SOI-induced anisotropy in the nonanalytic behavior of $\chi$ is
+a possible instability of a second-order ferromagnetic quantum phase transition
+with respect to a first-order transition to an XY ferromagnetic state.",1005.1913v2
+2017-04-26,Paths to collapse for isolated skyrmions in few-monolayer ferromagnetic films,"Magnetic skyrmions are topological spin configurations in materials with
+chiral Dzyaloshinskii-Moriya interaction (DMI), that are potentially useful for
+storing or processing information. To date, DMI has been found in few bulk
+materials, but can also be induced in atomically thin magnetic films in contact
+with surfaces with large spin-orbit interactions. Recent experiments have
+reported that isolated magnetic skyrmions can be stabilized even near room
+temperature in few-atom thick magnetic layers sandwiched between materials that
+provide asymmetric spin-orbit coupling. Here we present the minimum-energy path
+analysis of three distinct mechanisms for the skyrmion collapse, based on ab
+initio input and the performed atomic-spin simulations. We focus on the
+stability of a skyrmion in three atomic layers of Co, either epitaxial on the
+Pt(111) surface, or within a hybrid multilayer where DMI nontrivially varies
+per monolayer due to competition between different symmetry-breaking from two
+sides of the Co film. In laterally finite systems, their constrained geometry
+causes poor thermal stability of the skyrmion toward collapse at the boundary,
+which we show to be resolved by designing the high-DMI structure within an
+extended film with lower or no DMI.",1704.08025v1
+2014-05-06,Locally tunable disorder and entanglement in the one-dimensional plaquette orbital model,"We introduce a one-dimensional plaquette orbital model with a topology of a
+ladder and alternating interactions between $x$ and $z$ pseudospin components
+along both the ladder legs and on the rungs. We show that it is equivalent to
+an effective spin model in a magnetic field, with spin dimers that replace
+plaquettes and are coupled along the chain by three-spin interactions. Using
+perturbative treatment and mean field approaches with dimer correlations we
+study the ground state spin configuration and its defects in the lowest excited
+states. By the exact diagonalization approach we find that the quantum effects
+in the model are purely short-range and we get estimated values of the ground
+state energy and the gap in the thermodynamic limit from the system sizes up to
+$L=12$ dimers. Finally, we study a class of excited states with classical-like
+defects accumulated in the central region of the chain to find that in this
+region the quantum entanglement measured by the mutual information of
+neighboring dimers is locally increased and coincides with disorder and
+frustration. Such islands of entanglement in otherwise rather classical system
+may be of interest in the context of quantum computing devices.",1405.1401v1
+2018-01-29,Magnetism of a Co monolayer on Pt(111) capped by overlayers of $5d$ elements: a spin-model study,"Using first-principles calculations, we study the magnetic properties of a Co
+monolayer on a Pt(111) surface with a capping monolayer of selected $5d$
+elements (Re, Os, Ir, Pt and Au). First we determine the tensorial exchange
+interactions and magnetic anisotropies characterizing the Co monolayer for all
+considered systems. We find a close relationship between the magnetic moment of
+the Co atoms and the nearest-neighbor isotropic exchange interaction, which is
+attributed to the electronic hybridization between the Co and the capping
+layers, in spirit of the Stoner picture of ferromagnetism. The
+Dzyaloshinskii-Moriya interaction is decreased for all overlayers compared to
+the uncapped Co/Pt(111) system, while even the sign of the
+Dzyaloshinskii-Moriya interaction changes in case of the Ir overlayer. We
+conclude that the variation of the Dzyaloshinskii-Moriya interaction is well
+correlated with the change of the magnetic anisotropy energy and of the orbital
+moment anisotropy. The unique influence of the Ir overlayer on the
+Dzyaloshinskii-Moriya interaction is traced by scaling the strength of the
+spin--orbit coupling of the Ir atoms in Ir/Co/Pt(111) and by changing the Ir
+concentration in the Au$_{1-x}$Ir$_{x}$/Co/Pt(111) system. Our spin dynamics
+simulations indicate that the magnetic ground state of Re/Co/Pt(111) thin film
+is a spin spiral with a tilted normal vector, while the other systems are
+ferromagnetic.",1801.09426v1
+2019-09-24,Two-band superconductivity with unconventional pairing symmetry in HfV$_2$Ga$_4$,"In this letter, we have examined the superconducting ground state of the
+HfV$_2$Ga$_4$ compound using resistivity, magnetization, zero-field (ZF) and
+transverse-field (TF) muon-spin relaxation and rotation ($\mu$SR) measurements.
+Resistivity and magnetization unveil the onset of bulk superconductivity with
+$T_{\bf c}\sim$ 3.9~K, while TF-$\mu$SR measurements show that the temperature
+dependence of the superfluid density is well described by a nodal two-gap
+$s$+$d$-wave order parameter model. In addition, ZF muon relaxation rate
+increases with decreasing temperature below 4.6 K, indicating the presence of
+weak spin fluctuations. These observations suggest an unconventional multiband
+nature of the superconductivity possibly arising from the distinct $d$-bands of
+V and Hf ions with spin fluctuations playing an important role. To better
+understand these findings, we carry out first-principles electronic-structure
+calculations, further highlighting that the Fermi surface consists of multiple
+disconnected sheets with very different orbital weights and spin-orbit
+coupling, bridging the way for a nodal multiband superconductivity scenario. In
+this vein, therefore, HfV$_2$Ga$_4$-family stands out as an open avenue to
+novel unexplored unconventional superconducting compounds, such as
+ScV$_2$Ga$_4$ and ZrV$_2$Ga$_4$, and other many rare earths based materials.",1909.10712v1
+2019-10-29,Common Envelope Wind Tunnel: The Effects of Binary Mass Ratio and Implications for the Accretion-Driven Growth of LIGO Binary Black Holes,"We present three-dimensional local hydrodynamic simulations of flows around
+objects embedded within stellar envelopes using a ""wind tunnel"" formalism. Our
+simulations model the common envelope dynamical inspiral phase in binary star
+systems in terms of dimensionless flow characteristics. We present suites of
+simulations that study the effects of varying the binary mass ratio, stellar
+structure, equation of state, relative Mach number of the object's motion
+through the gas, and density gradients across the gravitational focusing scale.
+For each model, we measure coefficients of accretion and drag experienced by
+the embedded object. These coefficients regulate the coupled evolution of the
+object's masses and orbital tightening during the dynamical inspiral phase of
+the common envelope. We extrapolate our simulation results to accreting black
+holes with masses comparable to that of the population of LIGO black holes. We
+demonstrate that the mass and spin accrued by these black holes per unit
+orbital tightening are directly related to the ratio of accretion to drag
+coefficients. We thus infer that the mass and dimensionless spin of initially
+non-rotating black holes change by of order $1\%$ and 0.05, respectively, in a
+typical example scenario. Our prediction that the masses and spins of black
+holes remain largely unmodified by a common envelope phase aids in the
+interpretation of the properties of the growing observed population of merging
+binary black holes. Even if these black holes passed through a common envelope
+phase during their assembly, features of mass and spin imparted by previous
+evolutionary epochs should be preserved.",1910.13333v1
+2019-01-11,Quantitative imaging of hybrid chiral spin textures in magnetic multilayer systems by Lorentz microscopy,"Chiral magnetic textures in ultrathin perpendicularly magnetised multilayer
+film stacks with an interfacial Dzyaloshinskii-Moriya interaction have been the
+focus of much research recently. The chirality associated with the broken
+inversion symmetry at the interface between an ultrathin ferromagnetic layer
+and a heavy metal with large spin-orbit coupling supports homochiral N\'eel
+domain walls and hedgehog (N\'eel) skyrmions. Under spin-orbit torques these
+N\'eel type magnetic structures are predicted, and have been measured, to move
+at high velocities. However recent studies have indicated that some
+multilayered systems may possess a more complex hybrid domain wall
+configuration, due to the competition between interfacial DMI and interlayer
+dipolar fields. These twisted textures are expected to have thickness dependent
+N\'eel and Bloch contributions to the domain or skyrmion walls. In this work,
+we use the methods of Lorentz microscopy to measure quantitatively for the
+first time experimentally both; i) the contributions of the N\'eel and Bloch
+contributions and ii) their spatial spin variation at high resolution. These
+are compared with modelled and simulated structures which are in excellent
+agreement with our experimental results. Our quantitative analysis provides
+powerful direct evidence of the Bloch wall component which exists in these
+hybrid walls and will be significant when exploiting such phenomena in
+spintronic applications.",1901.03652v1
+2019-11-26,Interplay between superconductivity and spin-dependent fields in nanowire-based systems,"The interplay between superconductivity, spin-orbit coupling, and Zeeman or
+exchange field, is studied theoretically in two different setups: a single wire
+in which all these fields coexist, and a double wire system in which
+superconducting pairing and the spin-dependent fields are spatially separated.
+We first explore a magnetoelectric effect, namely the appearance of anomalous
+charge supercurrents. We determine the conditions under which such currents are
+allowed by symmetry and express them in terms of the SU(2) electric and
+magnetic fields. In leading order in the strength of the fields we find that in
+the single wire setup such currents may appear only when the Zeeman field has
+both, a longitudinal and transverse component with respect to the spin-orbit
+field. In contrast, in the two wire setup a parallel component to the SOC can
+generate the anomalous current, which is allowed by symmetry. We confirm these
+findings by calculating explicitly the current in both setups together with the
+self-consistent superconducting order parameter. The latter shows in the
+ground-state a spatial modulation of the phase that leads to currents that
+compensate the anomalous current, such that in both cases the ground state
+corresponds to a total zero-current state. However, in the two wire setup this
+zero-current state consists of two finite currents flowing in each of the wires
+in opposite direction.",1911.11741v3
+2017-07-13,Role of Square Planar Coordination in the Magnetic Properties of Na4IrO4,"Iridates supply fertile grounds for unconventional phenomena and exotic
+electronic phases. With respect to well-studied octahedrally-coordinated
+iridates, we pay our attention to a rather unexplored iridate, Na4IrO4, showing
+an unusual square-planar coordination. The latter is key to rationalize the
+electronic structure and magnetic property of Na4IrO4, which is here explored
+by first-principles density functional theory and Monte Carlo simulations. Due
+to the uncommon square-planar crystal field, Ir 5d states adopt
+intermediate-spin state with double occupation of dz2 orbital, leading to a
+sizable local spin moment, at variance with many other iridates. The
+square-planar crystal field splitting is also crucial in opening a robust
+insulating gap in Na4IrO4, irrespective of the specific magnetic ordering or
+treatment of electronic correlations. Spin-orbit coupling plays a minor role in
+shaping the electronic structure, but leads to a strong magnetocrystalline
+anisotropy. The easy axis perpendicular to the IrO4 plaquette, well explained
+using perturbation theory, is again closely related to the square-planar
+coordination. Finally, the large single-ion anisotropy suppresses the spin
+frustration and stabilizes a collinear antiferromagnetic long-range magnetic
+ordering, as confirmed by Monte Carlo simulations predicting a quite low N\'eel
+temperature, expected from almost isolated IrO4 square-planar units as
+crystalline building blocks.",1707.04052v1
+2021-02-01,Pure Gauge Spin-Orbit Couplings,"Planar systems with a general linear spin-orbit interaction (SOI) that can be
+cast in the form of a non-Abelian pure gauge field are investigated using the
+language of non-Abelian gauge field theory. A special class of these fields
+that, though a $2\times2$ matrix, are Abelian are seen to emerge and their
+general form is given. It is shown that the unitary transformation that gauges
+away these fields induces at the same time a rotation on the wavefunction about
+a fixed axis but with a space-dependent angle, both of which being
+characteristics of the SOI involved.The experimentally important case of
+equal-strength Rashba and Dresselhaus SOI (R+D SOI) is shown to fall within
+this special class of Abelian gauge fields, and the phenomenon of Persistent
+Spin Helix (PSH) that emerges in the presence of this latter SOI in a plane is
+shown to fit naturally within the general formalism developed. The general
+formalism is also extended to the case of a particle confined to a ring. It is
+shown that the Hamiltonian on a ring in the presence of equal-strength R+D SOI
+is unitarily equivalent to that of a particle subject to only a
+spin-independent but $\theta$-dependent potential with the unitary
+transformation relating the two being again the space-dependent rotation
+operator characteristic of R+D SOI.",2102.00907v1
+2021-05-01,Anisotropy and Current Control of Magnetization in SrRuO$_3$ SrTiO$_3$ Heterostructures for Spin-Memristors,"Spintronics-based nonvolatile components in neuromorphic circuits offer the
+possibility of realizing novel functionalities at low power. Current-controlled
+electrical switching of magnetization is actively researched in this context.
+Complex oxide heterostructures with perpendicular magnetic anisotropy (PMA),
+consisting of SrRuO$_3$ (SRO) grown on SrTiO$_3$ (STO) are strong material
+contenders. Utilizing the crystal orientation, magnetic anisotropy in such
+simple heterostructures can be tuned to either exhibit a perfect or slightly
+tilted PMA. Here, we investigate current-induced magnetization modulation in
+such tailored ferromagnetic layers with a material with strong spin-orbit
+coupling (Pt), exploiting the spin Hall effect. We find significant differences
+in the magnetic anisotropy between the SRO/STO heterostructures, as manifested
+in the first and second harmonic magnetoresistance measurements.
+Current-induced magnetization switching can be realized with spin-orbit
+torques, but for systems with perfect PMA this switching is probabilistic as a
+result of the high symmetry. Slight tilting of the PMA can break this symmetry
+and allow the realization of deterministic switching. Control over the magnetic
+anisotropy of our heterostructures therefore provides control over the manner
+of switching. Based on our findings, we propose a three-terminal spintronic
+memristor, with a magnetic tunnel junction design, that shows several resistive
+states controlled by electric charge. Non-volatile states can be written
+through SOT by applying an in-plane current, and read out as a tunnel current
+by applying a small out-of-plane current. Depending on the anisotropy of the
+SRO layer, the writing mechanism is either deterministic or probabilistic
+allowing for different functionalities to emerge. We envisage that the
+probabilistic MTJs could be used as synapses while the deterministic devices
+can emulate neurons",2105.00269v1
+2021-08-03,Dynamic transformation between a skyrmion string and a bimeron string in a layered frustrated system,"Frustrated topological spin textures have unique properties that may enable
+novel spintronic applications, such as helicity-based information storage and
+computing. Here, we report the statics and current-induced dynamics of
+two-dimensional (2D) pancake skyrmions in a stack of weakly coupled frustrated
+magnetic monolayers, which form a three-dimensional (3D) skyrmion string. The
+Bloch-type skyrmion string is energetically more stable than its N\'eel-type
+counterpart. It can be driven into translational motion by the dampinglike
+spin-orbit torque and shows the damping-dependent skyrmion Hall effect. Most
+notably, the skyrmion string can be transformed to a dynamically stable bimeron
+string by the dampinglike spin-orbit torque. The current-induced bimeron string
+rotates stably with respect to its center, which can spontaneously transform
+back to a skyrmion string when the current is switched off. Our results reveal
+unusual physical properties of 3D frustrated spin textures, and may open up
+different possibilities for spintronic applications based on skyrmion and
+bimeron strings.",2108.01365v2
+2023-01-18,Toward arbitrary spin-orbit flat optics via structured geometric phase gratings,"Reciprocal spin-orbit coupling (SOC) via geometric phase with flat optics
+provides a promising platform for shaping and controlling paraxial structured
+light. Current devices, from the pioneering q-plates to the recent J-plates,
+provide only spin-dependent wavefront modulation without amplitude control.
+However, achieving control over all the spatial dimensions of paraxial SOC
+states requires spin-dependent control of corresponding complex amplitude,
+which remains challenging for flat optics. Here, to address this issue, we
+present a new type of flat-optics elements termed structured geometric phase
+gratings that is capable of conjugated complex-amplitude control for orthogonal
+input circular polarizations. By using a microstructured liquid crystal
+photoalignment technique, we engineered a series of flat-optics elements and
+experimentally showed their excellent precision in arbitrary SOC control. This
+principle unlocks the full-field control of paraxial structured light via flat
+optics, providing a promising way to develop an information exchange and
+processing units for general photonic SOC states, as well as extra-/intracavity
+mode convertors for high-precision laser beam shaping.",2301.07408v1
+2023-06-11,Magnetic properties of a cavity-embedded square lattice of quantum dots or antidots,"We apply quantum electrodynamical density functional theory to obtain the
+electronic density, the spin polarization, as well as the orbital and the spin
+magnetization of square periodic arrays of quantum dots or antidots subjected
+to the influence of a far-infrared cavity photon field. A gradient-based
+exchange-correlation functional adapted to a two-dimensional electron gas in a
+transverse homogeneous magnetic field is used in the theoretical framework and
+calculations. The obtained results predict a non-trivial effect of the cavity
+field on the electron distribution in the unit cell of the superlattice, as
+well as on the orbital and the spin magnetization. The number of electrons per
+unit cell of the superlattice is shown to play a crucial role in the
+modification of the magnetization via the electron-photon coupling. The
+calculations show that cavity photons strengthen the diamagnetic effect in the
+quantum dots structure, while they weaken the paramagnetic effect in an antidot
+structure. As the number of electrons per unit cell of the lattice increases
+the electron-photon interaction reduces the exchange forces that would
+otherwise promote strong spin splitting for both the dot and the antidot array.",2306.06765v1
+2023-07-19,Linear-in-momentum spin orbit interactions in planar Ge/GeSi heterostructures and spin qubits,"We investigate the existence of linear-in-momentum spin-orbit interactions in
+the valence band of Ge/GeSi heterostructures using an atomistic tight-binding
+method. We show that symmetry breaking at the Ge/GeSi interfaces gives rise to
+a linear Dresselhaus-type interaction for heavy-holes. This interaction results
+from the heavy-hole/light-hole mixings induced by the interfaces and can be
+captured by a suitable correction to the minimal Luttinger-Kohn, four bands
+$\vec{k}\cdot\vec{p}$ Hamiltonian. It is dependent on the steepness of the
+Ge/GeSi interfaces, and is suppressed if interdiffusion is strong enough.
+Besides the Dresselhaus interaction, the Ge/GeSi interfaces also make a
+contribution to the in-plane gyromagnetic $g$-factors of the holes. The
+tight-binding calculations also highlight the existence of a small linear
+Rashba interaction resulting from the couplings between the
+heavy-hole/light-hole manifold and the conduction band enabled by the low
+structural symmetry of Ge/GeSi heterostructures. These interactions can be
+leveraged to drive the hole spin. The linear Dresselhaus interaction may, in
+particular, dominate the physics of the devices for out-of-plane magnetic
+fields. When the magnetic field lies in-plane, it is, however, usually far less
+efficient than the $g$-tensor modulation mechanisms arising from the motion of
+the dot in non-separable, inhomogeneous electric fields and strains.",2307.10007v2
+2023-08-03,Flavor-wave theory with quasiparticle damping at finite temperatures: Application to chiral edge modes in the Kitaev model,"We propose a theoretical framework to investigate elementary excitations at
+finite temperatures within a localized electron model that describes the
+interactions between multiple degrees of freedom, such as quantum spin models
+and Kugel-Khomskii models. Thus far, their excitation structures have been
+mainly examined using the linear flavor-wave theory, an SU($N$) generalization
+of the linear spin-wave theory. These techniques introduce noninteracting
+bosonic quasiparticles as elementary excitations from the ground state, thereby
+elucidating numerous physical phenomena, including excitation spectra and
+transport properties characterized by topologically nontrivial band structures.
+Nevertheless, the interactions between quasiparticles cannot be ignored in
+systems exemplified by $S=1/2$ quantum spin models, where strong quantum
+fluctuations are present. Recent studies have investigated the effects of
+quasiparticle damping at zero temperature in such models. In our study,
+extending this approach to the flavor-wave theory for general localized
+electron models, we construct a comprehensive method to calculate excitation
+spectra with the quasiparticle damping at finite temperatures. We apply our
+method to the Kitaev model under magnetic fields, a typical example of models
+with topologically nontrivial magnon bands. Our calculations reveal that chiral
+edge modes undergo significant damping in weak magnetic fields, amplifying the
+damping rate by the temperature increase. This effect is caused by collisions
+with thermally excited quasiparticles. Since our approach starts from a general
+Hamiltonian, it will be widely applicable to other localized systems, such as
+spin-orbital coupled systems derived from multi-orbital Hubbard models in the
+strong correlation limit.",2308.01711v1
+2023-11-13,Origin of reduced dynamical friction by dark matter halos with net prograde rotation,"We provide an explanation for the reduced dynamical friction on galactic bars
+in spinning dark matter halos. Earlier work based on linear theory predicted an
+increase in dynamical friction when dark halos have a net forward rotation,
+because prograde orbits couple to bars with greater strength than retrograde
+orbits. Subsequent numerical studies, however, found the opposite trend:
+dynamical friction weakens with increasing spin of the halo. We revisit this
+problem and demonstrate that linear theory in fact correctly predicts a reduced
+torque in forward-rotating halos. We show that shifting the halo mass from
+retrograde to prograde phase space generates a positive gradient in the
+distribution function near the origin of the z-angular momentum (Lz=0), which
+results in a resonant transfer of Lz to the bar, making the net dynamical
+friction weaker. While this effect is subdominant for the major resonances,
+including the corotation resonance, it leads to a significant positive torque
+on the bar for the series of direct radial resonances, as these resonances are
+strongest at Lz=0. The overall dynamical friction from spinning halos is shown
+to decrease with the halo's spin, in agreement with the secular behavior of
+N-body simulations. We validate our linear calculation by computing the
+nonlinear torque from individual resonances using the angle-averaged
+Hamiltonian.",2311.07640v2
+2023-11-20,Interplay between moment-dependent and field-driven unidirectional magnetoresistance in CoFeB/InSb/CdTe heterostructures,"Magnetoresistance effects are crucial for understanding the charge/spin
+transport as well as propelling the advancement of spintronic applications.
+Here we report the coexistence of magnetic moment-dependent (MD) and magnetic
+field-driven (FD) unidirectional magnetoresistance (UMR) effects in
+CoFeB/InSb/CdTe heterostructures. The strong spin-orbital coupling of InSb and
+the matched impedance at the CoFeB/InSb interface warrant a distinct MD-UMR
+effect at room temperature, while the interaction between the in-plane magnetic
+field and the Rashba effect at the InSb/CdTe interface induces the marked
+FD-UMR signal that dominates the high-field region. Moreover, owning to the
+different spin transport mechanisms, these two types of nonreciprocal charge
+transport show opposite polarities with respect to the magnetic field
+direction, which further enable an effective phase modulation of the
+angular-dependent magnetoresistance. Besides, the demonstrations of both the
+tunable UMR response and two-terminal spin-orbit torque-driven magnetization
+switching validate our CoFeB/InSb/CdTe system as a suitable integrated building
+block for multifunctional spintronic device design.",2311.11843v1
+2020-06-18,Electron correlation effects in the exchange coupling at the Fe/CoO/Ag(001) ferro-/antiferro-magnetic interface,"Angle resolved-Auger-photoelectron coincidence spectroscopy (AR-APECS) has
+been exploited to investigate the role that electron correlation plays in the
+exchange-coupling at the ferromagnetic/antiferromagnetic interface of a Fe/CoO
+bilayer growth on Ag(001). The effective correlation energy U$_{\textrm{eff}}$,
+usually employed to assess the energy distribution of core-valence-valence
+Auger spectra, has been experimentally determined for each possible combination
+of the orbital (e$_g$ or t$_{2g}$) and the spin (majority or minority) of the
+two valence electrons involved in the Auger decay. Coulomb and exchange
+interactions have been identified and compared with the result obtained on the
+Fe/Ag system. The presented analysis reveals in the Fe/CoO interface an
+enhancement of the Coulomb interaction for the e$_g$ orbital and of the
+exchange interaction for the t$_{2g}$ orbital with respect to the Fe/Ag case
+that can be associated to the stronger electron confinement and to the exchange
+coupling between the two layers, respectively.",2006.10854v2
+2016-06-27,Hidden-charm pentaquarks as a meson-baryon molecule with coupled channels for $\bar{D}^{(\ast)}Λ_{\rm c}$ and $\bar{D}^{(\ast)}Σ^{(\ast)}_{\rm c}$,"The recent observation of two hidden-charm pentaquark states by LHCb
+collaborations prompted us to investigate the exotic states close to the
+$\bar{D}\Lambda_{\rm c}$, $\bar{D}^{\ast}\Lambda_{\rm c}$, $\bar{D}\Sigma_{\rm
+c}$, $\bar{D}\Sigma^{\ast}_{\rm c}$, $\bar{D}^{\ast}\Sigma_{\rm c}$ and
+$\bar{D}^{\ast}\Sigma^{\ast}_{\rm c}$ thresholds. We therefore studied the
+hadronic molecules that form the coupled-channel system of
+$\bar{D}^{(\ast)}\Lambda_{\rm c}$ and
+  $\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$. As the heavy quark spin symmetry
+manifests the mass degenerations of $\bar{D}$ and $\bar{D}^\ast$ mesons, and of
+$\Sigma_{\rm c}$ and $\Sigma^\ast_{\rm c}$ baryons, the coupled channels of
+$\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$ are important in these molecules. In
+addition, we consider the coupling to the $\bar{D}^{(\ast)}\Lambda_{\rm c}$
+channel whose thresholds are near the $\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$
+thresholds, and the coupling to the state with nonzero orbital angular momentum
+mixed by the tensor force. This full coupled channel analysis of
+$\bar{D}^{(\ast)}\Lambda_{\rm c}-\bar{D}^{(\ast)}\Sigma^{(\ast)}_{\rm c}$ with
+larger orbital angular momentum has never been performed before. By solving the
+coupled-channel Schr\""odinger equations with the one meson exchange potentials
+that respected to the heavy quark spin and chiral symmetries, we studied the
+hidden-charm hadronic molecules with $I(J^P)=1/2(3/2^\pm)$ and $1/2(5/2^\pm)$.
+We conclude that the $J^P$ assignment of the observed pentaquarks is $3/2^+$
+for $P^+_{\rm c}(4380)$ and $5/2^-$ for $P^+_{\rm c}(4450)$, which is agreement
+with the results of the LHCb analysis. In addition, we give predictions for
+other $J^P=3/2^\pm$ states at 4136.0, 4307.9 and 4348.7 MeV in $J^P=3/2^-$, and
+4206.7 MeV in $J^P=3/2^+$, which can be further investigated by means of
+experiment.",1606.08330v2
+1997-12-26,Innermost Stable Circular Orbit of a Spinning Particle in Kerr Spacetime,"We study stability of a circular orbit of a spinning test particle in a Kerr
+spacetime. We find that some of the circular orbits become unstable in the
+direction perpendicular to the equatorial plane, although the orbits are still
+stable in the radial direction. Then for the large spin case ($S < \sim O(1)),
+the innermost stable circular orbit (ISCO) appears before the minimum of the
+effective potential in the equatorial plane disappears. This changes the radius
+of ISCO and then the frequency of the last circular orbit.",9712095v1
+2013-10-30,Ground state of S=1 zigzag spin-orbital chain,"We investigate ground-state properties of a $t_{\rm 2g}$-orbital Hubbard
+model on a zigzag chain relevant for CaV$_{2}$O$_{4}$, by exploiting numerical
+techniques such as Lanczos diagonalization and density-matrix renormalization
+group. Assuming a V$^{3+}$ ion, a local spin $S$=$1$ state is formed by two
+electrons in the $t_{\rm 2g}$ orbitals. That is, the system is a Haldane system
+with active $t_{\rm 2g}$-orbital degrees of freedom. We observe orbital-state
+transitions, yielding a distinct spin system under the orbital-ordered
+background. We also discuss the orbital structure induced by open edges,
+originating in the spatial anisotropy of the $t_{\rm 2g}$ orbitals.",1310.8018v1
+2002-04-01,Spin Fluctuation Induced Superconductivity Controlled by Orbital Fluctuation,"A microscopic Hamiltonian reflecting the correct symmetry of $f$-orbitals is
+proposed to discuss superconductivity in heavy fermion systems. In the
+orbitally degenerate region in which not only spin fluctuations but also
+orbital fluctuations develop considerably, cancellation between spin and
+orbital fluctuations destabilizes $d_{x^{2}-y^{2}}$-wave superconductivity.
+Entering the non-degenerate region by increasing the crystalline electric
+field, $d_{x^{2}-y^{2}}$-wave superconductivity mediated by antiferromagnetic
+spin fluctuations emerges out of the suppression of orbital fluctuations. We
+argue that the present scenario can be applied to recently discovered
+superconductors CeTIn$_{5}$ (T=Ir, Rh, and Co).",0204023v2
+2007-03-05,Orbital correlations in monolayer manganites - From spin t-J model to orbital t-J model,"On the example of monolayer manganites we show that the theoretical ideas
+developed long ago along the derivation of the spin t-J model from the Hubbard
+model are nowadays very helpful in strongly correlated oxides with partly
+filled degenerate orbitals. We analyze a realistic orbital t-J model for e_g
+electrons in La_{1-x}Sr_{1+x}MnO_4 monolayer manganites, and discuss the
+evolution of spin and orbital correlations under increasing doping by
+performing exact diagonalization of finite clusters, with electronic kinetic
+energy determined self-consistently at finite temperature by classical Monte
+Carlo for t_2g spins. Several experimental results are reproduced.",0703127v1
+2013-08-05,Pseudospin symmetry in supersymmetric quantum mechanics: II. Spin-orbit effects,"Following a previous paper [Haozhao Liang \textit{et al.}, Phys. Rev. C
+\textbf{87}, 014334 (2013)], we discuss the spin-orbit effects on the
+pseudospin symmetry (PSS) within the framework of supersymmetric quantum
+mechanics. By using the perturbation theory, we demonstrate that the
+perturbative nature of PSS maintains when a substantial spin-orbit potential is
+included. With the explicit PSS-breaking potential, the spin-orbit effects on
+the pseudospin-orbit splittings are investigated in a quantitative way.",1308.1143v1
+1994-11-19,Order $\hbar$ Corrections to the Classical Dynamics of a Particle with Intrinsic Spin Moving in a Constant Magnetic Field,"$O(\hbar)$ effects that modify the classical orbit of a charged particle are
+described for the case of a classical spin-1/2 particle moving in a constant
+magnetic field, using a manifestly covariant formalism reported previously. It
+is found that the coupling between the momentum and spin gives rise to a shift
+in the cyclotron frequency, which is explicitly calculated. In addition the
+orbit is found to exhibit $O(\hbar)$ oscillations along the axis of the uniform
+static magnetic field whenever the gyromagnetic ratio $g$ of the particle is
+not 2. This oscillation is found to occur at a frequency $\propto$ $\frac{g}{2}
+- 1$, and is an observable source of electric dipole radiation.",9411002v1
+1998-05-11,Superflow-Stabilized Nonlinear NMR in Rotating 3He-B,"Nonlinear spin precession has been observed in 3He-B in large counterflow of
+the normal and superfluid fractions. The new precessing state is stabilized at
+high rf excitation level and displays frequency-locked precession over a large
+range of frequency shifts, with the magnetization at its equilibrium value.
+Comparison to analytical and numerical calculation indicates that in this state
+the orbital angular momentum L of the Cooper pairs is oriented transverse to
+the external magnetic field in a ``non-Leggett'' configuration with broken
+spin-orbit coupling. The resonance shift depends on the tipping angle theta of
+the magnetization as omega - omega_L = (Omega_B^2 / 2 omega_L)(cos(theta) -
+1/5). The phase diagram of the precessing modes with arbitrary orientation of L
+is constructed.",9805119v2
+2002-06-03,Quantum in-plane magnetoresistance in 2D electron systems,"We review various aspects of magnetoresistance in (quasi-)twodimensional
+systems subject to an in-plane magnetic field. Concentrating on single-particle
+effects, three mechanisms leading to magnetoresistance are discussed: the
+orbital effect of the magnetic field -- due to inter-subband mixing -- and the
+sensitivity of this effect to the geometrical symmetry of the system, the
+interplay between spin-orbit coupling and Zeeman splitting, and the influence
+of the field on spin scattering at magnetic impurities.",0206024v1
+2004-07-29,Anisotropy in Ferromagnetic Nanoparticles: Level-to-Level Fluctuations of a Collective Effect,"We calculate the mesoscopic fluctuations of the magnetic anisotropy of
+ferromagnetic nanoparticles. A microscopic spin-orbit Hamiltonian considered as
+a perturbation of the much stronger exchange interaction first yields an
+explicit expression for the anisotropy tensor. Then, assuming a simple random
+matrix model for the spin-orbit coupling allows us to describe the fluctuation
+of such a tensor. In the case of uniaxial anisotropy, we calculate the
+distribution of the anisotropy constant for a given number of electrons, and
+its variation upon increasing this number by one. The magnitude of the latter
+is sufficient to account for the experimental data.",0407771v2
+2005-04-08,On the crystal field in the modern solid-state theory,"We point out the high physical correctness of the use and the concept of the
+crystal-field approach, even if is used to metallic magnetic materials of
+transition-metal 3d/4f/5f compounds. We discuss the place of the crystal-field
+theory in modern solid-state physics and we point out the necessity to consider
+the crystal-field approach with the spin-orbit coupling and strong electron
+correlations, as a contrast to the single-electron version of the crystal field
+customarily used for 3d electrons. We have extended the strongly-correlated
+crystal-field theory to a Quantum Atomistic Solid-State Theory (QUASST) to
+account for the translational symmetry and inter-site spin-dependent
+interactions indispensable for formation of magnetically-ordered state. We have
+correlated macroscopic magnetic and electronic properties with the atomic-scale
+electronic structure for ErNi5, UPd2Al3, FeBr2, LaCoO3 and LaMnO3. In QUASST we
+have made unification of 3d and rare-earth compounds in description of the
+low-energy electronic structures and magnetism of open 3d-/4f-/5f-shell
+electrons. QUASST offers consistent description of zero-temperature properties
+and thermodynamic properties of 4f-/5f-/3d-atom containing compounds. Our
+studies indicate that it is the highest time to unquench the orbital magnetism
+in 3d oxides.",0504199v1
+2005-08-16,Charge order and spin-singlet pairs formation in Ti4O7,"Charge ordering in the low-temperature triclinic structure of titanium oxide
+(Ti4O7) is investigated using the local density approximation (LDA)+U method.
+Although the total 3d charge separation is rather small, an orbital order
+parameter defined as the difference between t2g occupancies of Ti$^{3+}$ and
+Ti$^{4+}$ cations is large and gives direct evidence for charge ordering. Ti 4s
+and 4p states make a large contribution to the static ""screening"" of the total
+3d charge difference. This effective charge screening leads to complete loss of
+the disproportionation between the charges at 3+ and 4+ Ti sites. The occupied
+t2g states of Ti$^{3+}$ cations are predominantly of $d_{xy}$ character and
+form a spin-singlet molecular orbital via strong direct antiferromagnetic
+exchange coupling between neighboring Ti(1) and Ti(3) sites, whereas the role
+of superexchange is found to be negligible.",0508378v1
+2006-06-30,Room-temperature delayed giant magnetodielectric effects observed in Bi4Fe2TiO12 film,"This letter reports our experimental results on magnetic-field-induced
+aftereffects in solution derived Bi4Fe2TiO12 film, in which e' decreases as
+much as 600 times after treated in a 5T magnetic field as that of the pristine
+one. The phenomena are explained by an unusual spin-orbital coupling in film,
+where strong magnetic field provides drive force for spin polarized electrons
+of electrode to enter film, so as to form a ferromagnetic orbital state,
+increase the relaxation time of defect dipoles and then produce giant
+magnetodielectric effects. This process is reversible just by applying a
+opposite 0.5T magnetic field. Our findings have potential applications on
+magnetic fabrication of nanopatterns somehow to evade nanohazard, as well as on
+integraged phononic or photonic crystals on chip.",0606791v2
+2006-07-07,"Partial localization of correlated electrons: spin dependent masses, saturated ferromagnetism, and effective s-d model","We determine the localization threshold in a partially filled and orbitally
+degenerate model of correlated electrons. Particular emphasis is put on a
+non-integer band filling, when the system decomposes into the localized and the
+itinerant subsystems; this situation is described by an effective s-d model. A
+simultaneous transition to the ferromagnetic state is discussed as driven by
+the Hund's rule coupling. Dependence of the quasiparticle mass on the spin
+direction appears naturally in the ferromagnetic phase and is attributed to the
+electron correlation effects, as is also a metamagnetic transition in an
+applied field. Although the main results have been obtained within the saddle
+point slave-boson approach, their qualitative features are discussed in general
+terms, i.e. as a transition from quantum-mechanical indistinguishability of
+particles to the two-component situation. A comparison with the situation for
+the orbitally nondegenerate band is also briefly mentioned.",0607188v1
+2006-09-09,Ground-state Competition of Two-Component Bosons in Optical Lattice near a Feshbach Resonance,"We investigate the ground state properties of an equal mixture of two species
+of bosons in its Mott-insulator phase at a filling factor two per site. We
+identify one type of spin triplet-singlet transition through the competition of
+ground state. When the on-site interaction is weak ($U<U_c$) the two particles
+prefer to stay in the lowest band and with weak tunnelling between neighboring
+sites the system is mapped into an effective spin-1 ferromagnetic exchange
+Hamiltonian. When the interaction is tuned by a Feshbach resonance to be large
+enough ($U>U_c$), higher band will be populated. Due to the orbital coupling
+term $S^+S^-$ in the Hamiltonian, the two atoms in different orbits on a site
+would form an on-site singlet. For a non-SU(2)-symmetric model, easy-axis or
+easy-plane ferromagnetic spin exchange models may be realized corresponding to
+phase separation or counter-flow superfluidity, respectively.",0609219v3
+2002-08-16,Effect of Earth's rotation on the trajectories of free-fall bodies in Equivalence Principle Experiment,"Owing to Earth's rotation a free-fall body would move in an elliptical orbit
+rather than along a straight line forward to the center of the Earth. In this
+paper on the basis of the theory for spin-spin coupling between macroscopic
+rotating bodies we study violation of the equivalence principle from
+long-distance free-fall experiments by means of a rotating ball and a
+non-rotating sell. For the free-fall time of 40 seconds, the difference between
+the orbits of the two free-fall bodies is of the order of 10^{-9}cm which could
+be detected by a SQUID magnetometer owing to such a magnetometer can be used to
+measure displacements as small as 10^{-13} centimeters.",0208041v1
+1997-04-18,Generalization of the Bound State Model,"In the bound state approach the heavy baryons are constructed by binding,
+with any orbital angular momentum, the heavy meson multiplet to the nucleon
+considered as a soliton in an effective meson theory. We point out that this
+picture misses an entire family of states, labeled by a different angular
+momentum quantum number, which are expected to exist according to the geometry
+of the three-body constituent quark model (for N_C=3). To solve this problem we
+propose that the bound state model be generalized to include orbitally excited
+heavy mesons bound to the nucleon. In this approach the missing angular
+momentum is ``locked-up'' in the excited heavy mesons. In the simplest
+dynamical realization of the picture we give conditions on a set of coupling
+constants for the binding of the missing heavy baryons of arbitrary spin. The
+simplifications made include working in the large M limit, neglecting nucleon
+recoil corrections, neglecting mass differences among different heavy spin
+multiplets and also neglecting the effects of light vector mesons.",9704358v1
+2002-02-13,Semiclassical trace formulae for systems with spin-orbit interactions: successes and limitations of present approaches,"We discuss the semiclassical approaches for describing systems with
+spin-orbit interactions by Littlejohn and Flynn (1991, 1992), Frisk and Guhr
+(1993), and by Bolte and Keppeler (1998, 1999). We use these methods to derive
+trace formulae for several two- and three-dimensional model systems, and
+exhibit their successes and limitations. We discuss, in particular, also the
+mode conversion problem that arises in the strong-coupling limit.",0202028v3
+2000-06-05,Successive approximations for charged particle motion,"Single particle dynamics in electron microscopes, ion or electron
+lithographic instruments, particle accelerators, and particle spectrographs is
+described by weakly nonlinear ordinary differential equations. Therefore, the
+linear part of the equation of motion is usually solved and the nonlinear
+effects are then found in successive order by iteration methods. A Hamiltonian
+nature of these equations can lead to simplified computations of particle
+transport through an optical device when a suitable computational method is
+used. Many ingenious microscopic and lithographic devices were found by H. Rose
+and his group due to the simple structure of the eikonal method. In the area of
+accelerator physics the eikonal method has never become popular. Here I will
+therefore generalize the eikonal method and derive it from a Hamiltonian quite
+familiar to the accelerator physics community. With the event of high energy
+polarized electron beams and plans for high energy proton beams, nonlinear
+effects in spin motion have become important in high energy accelerators. I
+will introduce a successive approximation for the nonlinear effects in the
+coupled spin and orbit motion of charged particles which resembles some of the
+simplifications resulting from the eikonal method for the pure orbit motion.",0006008v1
+2007-08-03,Strong spin-orbit induced Gilbert damping and g-shift in iron-platinum nanoparticles,"The shape of ferromagnetic resonance spectra of highly dispersed, chemically
+disordered Fe_{0.2}Pt_{0.8} nanospheres is perfectly described by the solution
+of the Landau-Lifshitz-Gilbert (LLG) equation excluding effects by crystalline
+anisotropy and superparamagnetic fluctuations. Upon decreasing temperature, the
+LLG damping $\alpha(T)$ and a negative g-shift, g(T)-g_0, increase proportional
+to the particle magnetic moments determined from the Langevin analysis of the
+magnetization isotherms. These novel features are explained by the scattering
+of the $q \to 0$ magnon from an electron-hole (e/h) pair mediated by the
+spin-orbit coupling, while the sd-exchange can be ruled out. The large
+saturation values, $\alpha(0)=0.76$ and $g(0)/g_0-1=-0.37$, indicate the
+dominance of an overdamped 1 meV e/h-pair which seems to originate from the
+discrete levels of the itinerant electrons in the d_p=3 nm nanoparticles.",0708.0463v1
+2008-05-21,Upper critical field in noncentrosymmetric superconductors,"We calculate the upper critical field in superconductors without inversion
+symmetry at arbitrary temperatures, in the presence of scalar impurities. Both
+orbital and spin (paramagnetic) mechanisms of pair breaking are considered. The
+superconducting phase transition at nonzero field occurs into a helical vortex
+state, in which the order parameter is modulated along the applied field (in a
+cubic crystal). The helical state is stable with respect to disorder. However,
+if the difference between the densities of states in the electron bands split
+by spin-orbit coupling is neglected, then the order parameter modulation is
+present only at low temperatures, and only if the system is sufficiently clean
+and paramagnetically limited. This state resembles the
+Larkin-Ovchinnikov-Fulde-Ferrell state in centrosymmetric superconductors.",0805.3338v2
+2008-12-31,"Accurate calculations of the dissociation energy, equilibrium distance and spectroscopic constants for the Yb dimer","The dissociation energy, equilibrium distance, and spectroscopic constants
+for the $^1\Sigma_g^+$ ground state of the Yb$_2$ molecule are calculated. The
+relativistic effects are introduced through generalized relativistic effective
+core potentials with very high precision. The scalar relativistic coupled
+cluster method particularly well suited for closed-shell van-der-Waals systems
+is used for the correlation treatment. Extensive generalized correlation basis
+sets were constructed and employed. The relatively small corrections for
+high-order cluster amplitudes and spin-orbit interactions are taken into
+account using smaller basis sets and the spin-orbit density functional theory.",0901.0077v6
+2010-09-27,"Remote Preparation of Single-Photon ""Hybrid"" Entangled and Vector-Polarization States","Quantum teleportation faces increasingly demanding requirements for
+transmitting large or even entangled systems. However, knowledge of the state
+to be transmitted eases its reconstruction, resulting in a protocol known as
+remote state preparation. A number of experimental demonstrations to date have
+been restricted to single-qubit systems. We report the remote preparation of
+two-qubit ""hybrid"" entangled states, including a family of vector-polarization
+beams. Our single-photon states are encoded in the photon spin and orbital
+angular momentum. We reconstruct the states by spin-orbit state tomography and
+transverse polarization tomography. The high fidelities achieved for the
+vector-polarization states opens the door to optimal coupling of down-converted
+photons to other physical systems, such as an atom, as required for scalable
+quantum networks, or plasmons in photonic nanostructures.",1009.5412v1
+2011-02-07,Competing Pairing Symmetries in a Generalized Two-Orbital Model for the Pnictides,"We introduce and study an extended ""t-U-J"" two-orbital model for the
+pnictides that includes Heisenberg terms deduced from the strong coupling
+expansion. Including these J terms explicitly allows us to enhance the strength
+of the (pi, 0)-(0, pi) spin order which favors the presence of tightly bound
+pairing states even in the small clusters that are here exactly diagonalized.
+The A1g and B2g pairing symmetries are found to compete in the realistic
+spin-ordered and metallic regime. The dynamical pairing susceptibility
+additionally unveils low-lying B1g states, suggesting that small changes in
+parameters may render any of the three channels stable.",1102.1445v2
+2011-03-19,Charge Stripes in the Two-Orbital Hubbard Model for Pnictides,"The two-orbital Hubbard model for the pnictides is studied numerically using
+the real-space Hartree-Fock approximation on finite clusters. Upon electron
+doping, states with a nonuniform distribution of charge are stabilized. The
+observed patterns correspond to charge stripes oriented perpendicular to the
+direction of the spin stripes of the undoped magnetic ground state. While these
+charge striped states are robust when the undoped state has a Hubbard gap,
+their existence when the intermediate-coupling magnetic metallic state of
+pnictides is doped was also observed for particular model parameters. Results
+for hole doping and implications for recent experiments that reported
+electronic nematic states and spin incommensurability are also briefly
+discussed.",1103.3743v1
+2011-09-05,Superconductivity in the topological semimetal YPtBi,"The noncentrosymmetric Half Heusler compound YPtBi exhibits superconductivity
+below a critical temperature T_c = 0.77 K with a zero-temperature upper
+critical field H_c2(0) = 1.5 T. Magnetoresistance and Hall measurements support
+theoretical predictions that this material is a topologically nontrivial
+semimetal having a surprisingly low positive charge carrier density of 2 x
+10^18 cm^-3. Unconventional linear magnetoresistance and beating in
+Shubnikov-de Haas oscillations point to spin-orbit split Fermi surfaces. The
+sensitivity of magnetoresistance to surface roughness suggests a possible
+contribution from surface states. The combination of noncentrosymmetry and
+strong spin-orbit coupling in YPtBi presents a promising platform for the
+investigation of topological superconductivity.",1109.0979v2
+2012-03-20,Formation of deeply bound ultracold Sr_2 molecules by photoassociation near the ^1S + ^3P_1 intercombination line,"We predict feasibility of the photoassociative formation of Sr_2 molecules in
+arbitrary vibrational levels of the electronic ground state based on
+state-of-the-art ab initio calculations. Key is the strong spin-orbit
+interaction between the c^3\Pi_u, A^1\Sigma_u^+ and B^1\Sigma_u^+ states. It
+creates not only an effective dipole moment allowing free-to-bound transitions
+near the ^1S + ^3P_1 intercombination line but also facilitates bound-to-bound
+transitions via resonantly coupled excited state rovibrational levels to deeply
+bound rovibrational levels of the ground X^1\Sigma_g^+ potential, with v"" as
+low as v""=6. The spin-orbit interaction is responsible for both optical
+pathways. Therefore, those excited state levels that have the largest
+bound-to-bound transition moments to deeply bound ground state levels also
+exhibit a sufficient photoassociation probability, comparable to that of the
+lowest weakly bound excited state level previously observed by Zelevinsky et
+al. [Phys. Rev. Lett. 96, 203201 (2006)]. Our study paves the way for an
+efficient photoassociative production of Sr_2 molecules in ground state levels
+suitable for experiments testing the electron-to-proton mass ratio.",1203.4552v1
+2012-03-26,Magneto-transport in mesoscopic rings and cylinders: Effects of electron-electron interaction and spin-orbit coupling,"We undertake an in-depth analysis of the magneto-transport properties in
+mesoscopic single-channel rings and multi-channel cylinders within a
+tight-binding formalism. The main focus of this review is to illustrate how the
+long standing anomalies between the calculated and measured current amplitudes
+carried by a small conducting ring upon the application of a magnetic flux
+$\phi$ can be removed. We discuss two different cases. First, we examine the
+combined effect of second-neighbor hopping integral and Hubbard correlation on
+the enhancement of persistent current in presence of disorder. A significant
+change in current amplitude is observed compared to the traditional
+nearest-neighbor hopping model and the current amplitude becomes quite
+comparable to experimental realizations. In the other case we verify that in
+presence of spin-orbit interaction a considerable enhancement of persistent
+current amplitude takes place, and the current amplitude in a disordered ring
+becomes almost comparable to that of an ordered one. In addition to these, we
+also present the detailed band structures and some other related issues to get
+a complete picture of the phenomena at the microscopic level.",1203.5779v1
+2012-08-21,Optimized production of ultracold ground-state molecules: Stabilization employing potentials with ion-pair character and strong spin-orbit coupling,"We discuss the production of ultracold molecules in their electronic ground
+state by photoassociation employing electronically excited states with ion-pair
+character and strong spin-orbit interaction. A short photoassociation laser
+pulse drives a non-resonant three-photon transition for alkali atoms colliding
+in their lowest triplet state. The excited state wave packet is transferred to
+the ground electronic state by a second laser pulse, driving a resonant
+two-photon transition. After analyzing the transition matrix elements governing
+the stabilization step, we discuss the efficiency of population transfer using
+transform-limited and linearly chirped laser pulses. Finally, we employ optimal
+control theory to find the most efficient stabilization pathways. We find that
+the stabilization efficiency can be increased by one and two orders of
+magnitude for linearly chirped and optimally shaped laser pulses, respectively.",1208.4331v2
+2013-03-05,Gate defined wires in HgTe quantum wells: from Majorana fermions to spintronics,"We introduce a promising new platform for Majorana zero-modes and various
+spintronics applications based on gate-defined wires in HgTe quantum wells. Due
+to the Dirac-like band structure for HgTe the physics of such systems differs
+markedly from that of conventional quantum wires. Most strikingly, we show that
+the subband parameters for gate-defined HgTe wires exhibit exquisite
+tunability: modest gate voltage variation allows one to modulate the Rashba
+spin-orbit energies from zero up to ~30K, and the effective g-factors from zero
+up to giant values exceeding 600. The large achievable spin-orbit coupling and
+g-factors together allow one to access Majorana modes in this setting at
+exceptionally low magnetic fields while maintaining robustness against
+disorder. As an additional benefit, gate-defined wires (in HgTe or other
+settings) should greatly facilitate the fabrication of networks for refined
+transport experiments used to detect Majoranas, as well as the realization of
+non-Abelian statistics and quantum information devices.",1303.1207v1
+2013-03-08,"Anisotropic Current-Controlled Magnetization Reversal in the Ferromagnetic Semiconductor (Ga,Mn)As","Electrical current manipulation of magnetization switching through
+spin-orbital coupling in ferromagnetic semiconductor (Ga,Mn)As Hall bar devices
+has been investigated. The efficiency of the current-controlled magnetization
+switching is found to be sensitive to the orientation of the current with
+respect to the crystalline axes. The dependence of the spin-orbit effective
+magnetic field on the direction and magnitude of the current is determined from
+the shifts in the magnetization switching angle. We find that the strain
+induced effective magnetic field is about three times as large as the Rashba
+induced magnetic field in our GaMnAs devices.",1303.1907v1
+2013-12-06,An all electron topological insulator in InAs double wells,"We show that electrons in ordinary III-V semiconductor double wells with an
+in-plane modulating periodic potential and inter well spin-orbit interaction
+are tunable Topological Insulators (TIs). Here the essential TI ingredients,
+namely, band inversion and the opening of an overall bulk gap in the spectrum
+arise, respectively, from (i) the combined effect of the double well even-odd
+state splitting $\Delta_{SAS}$ together with the superlattice potential and
+(ii) the interband Rashba spin-orbit coupling $\eta$. We corroborate our exact
+diagonalization results by an analytical nearly-free electron description that
+allows us to derive an effective Bernevig-Hughes-Zhang (BHZ) model.
+Interestingly, the gate-tunable $\Delta_{SAS}$ drives a topological phase
+transition featuring a discontinuous Chern number at $\Delta_{SAS}\sim 5.4$
+meV. Finally, we explicitly verify the bulk-edge correspondence by considering
+a strip configuration and determining not only the bulk bands in the
+non-topological and topological phases but also the edge states and their
+Dirac-like spectrum in the topological phase. The edge electronic densities
+exhibit peculiar spatial oscillations as they decay away into the bulk. For
+concreteness, we present our results for InAs-based wells with realistic
+parameters.",1312.2034v2
+2013-12-23,Broken SU(4) symmetry in a Kondo-correlated carbon nanotube,"Understanding the interplay between many-body phenomena and non-equilibrium
+in systems with entangled spin and orbital degrees of freedom is a central
+objective in nano-electronics. We demonstrate that the combination of Coulomb
+interaction, spin-orbit coupling and valley mixing results in a particular
+selection of the inelastic virtual processes contributing to the Kondo
+resonance in carbon nanotubes at low temperatures. This effect is dictated by
+conjugation properties of the underlying carbon nanotube spectrum at zero and
+finite magnetic field. Our measurements on a clean carbon nanotube are
+complemented by calculations based on a new approach to the non-equilibrium
+Kondo problem which well reproduces the rich experimental observations in Kondo
+transport.",1312.6586v4
+2014-07-04,Spin-orbit spillage as a measure of band inversion in insulators,"We propose a straightforward and effective approach for quantifying the band
+inversion induced by spin-orbit coupling in band insulators. In this approach
+we define a quantity as a function of wavevector in the Brillouin zone
+measuring the spillage between the occupied states of a system with and without
+SOC. Plots of the spillage throughout the BZ provide a ready indication of the
+number and location of band inversions driven by SOC. To illustrate the method,
+we apply this approach to the 2D Kane-Mele model, a 2D Bi bilayer with applied
+Zeeman field, and to first-principles calculations of some 3D materials
+including both trivial and \Z2\ topological insulators. We argue that the
+distribution of spillage in the BZ is closely related to the topological
+indices in these systems. Our approach provides a fresh perspective for
+understanding topological character in band theory, and should be helpful in
+searching for new materials with non-trivial band topology.",1407.1244v2
+2014-07-16,Tunability of the Fractional Quantum Hall States in Buckled Dirac Materials,"We report on the fractional quantum Hall states of germanene and silicene
+where one expects a strong spin-orbit interaction. This interaction causes an
+enhancement of the electron-electron interaction strength in one of the Landau
+levels corresponding to the valence band of the system. This enhancement
+manifests itself as an increase of the fractional quantum Hall effect gaps
+compared to that in graphene and is due to the spin-orbit induced coupling of
+the Landau levels of the conduction and valence bands, which modifies the
+corresponding wave functions and the interaction within a single level. Due to
+the buckled structure, a perpendicular electric field lifts the valley
+degeneracy and strongly modifies the interaction effects within a single Landau
+level: in one valley the perpendicular electric field enhances the interaction
+strength in the conduction band Landau level, while in another valley, the
+electric field strongly suppresses the interaction effects.",1407.4441v1
+2014-08-12,Interplay of spin-orbit and entropic effects in Cerium,"We perform first-principle calculations of elemental cerium and compute its
+pressure-temperature phase diagram, finding good quantitative agreement with
+the experiments. Our calculations indicate that, while a signature of the
+volume-collapse transition appears in the free energy already at low
+temperatures, at larger temperatures this signature is enhanced because of the
+entropic effects, and originates an actual thermodynamical instability.
+Furthermore, we find that the catalyst determining this feature is --- in all
+temperature regimes --- a pressure-induced effective reduction of the $f$-level
+degeneracy due to the spin-orbit coupling. Our analysis suggests also that the
+lattice vibrations might be crucial in order to capture the behavior of the
+pressure-temperature transition line at large temperatures.",1408.2815v1
+2014-08-29,Electric Octupole Order in Bilayer Ruthenate Sr$_3$Ru$_2$O$_7$,"Although the odd-parity multipole order barely occurs in crystals with high
+symmetry, it can be formed in locally noncentrosymmetric crystals. We
+illustrate the odd-parity electric octupole order generated in a bilayer
+structure. When the local electric quadrupole is alternatively stacked between
+layers, it is regarded as an electric octupole order from the viewpoint of
+symmetry. We show that the $p_y s_x + p_x s_y$ spin nematic order is induced by
+the spin-orbit coupling in the electric octupole state, and it results from the
+spontaneous inversion symmetry breaking leading to the $D_{2d}$ point group
+symmetry. We investigate the possible realization of the electric octupole
+order in the bilayer ruthenate Sr$_3$Ru$_2$O$_7$, assuming a local electric
+quadrupole arising from the Pomeranchuk instability and/or the orbital order.
+Effects of the lattice distortion and magnetic field are also clarified, and
+the nature of the ""electronic nematic state"" of Sr$_3$Ru$_2$O$_7$ is discussed.
+It is proposed that the asymmetric band structure is a signature of the
+electric octupole order in Sr$_3$Ru$_2$O$_7$. The odd-parity multipole order in
+other strongly correlated electron systems is discussed.",1408.6936v2
+2014-09-23,Negative Tunneling Magneto-Resistance in Quantum Wires with Strong Spin-Orbit Coupling,"We consider a two-dimensional magnetic tunnel junction of the
+FM/I/QW(FM+SO)/I/N structure, where FM, I and QW(FM+SO) stand for a
+ferromagnet, an insulator and a quantum wire (QW) with both magnetic ordering
+and Rashba spin-orbit (SOC), respectively. The tunneling magneto-resistance
+(TMR) exhibits strong anisotropy and switches sign as the polarization
+direction varies relative to the QW axis, due to interplay among the
+one-dimensionality, the magnetic ordering, and the strong SOC of the QW. The
+results may provide a possible explanation for the sign-switching anisotropic
+TMR recently observed in the LaAlO$_3$/SrTiO$_3$ interface.",1409.6374v2
+2014-11-12,Spin-Orbit-Free Topological Insulators,"In this lecture for the Nobel symposium, we review previous research on a
+class of translational-invariant insulators without spin-orbit coupling. These
+may be realized in intrinsically spinless systems such as photonic crystals and
+ultra-cold atoms. Some of these insulators have no time-reversal symmetry as
+well, i.e., the relevant symmetries are purely crystalline. Nevertheless,
+topological phases exist which are distinguished by their robust surface modes.
+To describe these phases, we introduce the notions of (a) a halved-mirror
+chirality: an integer invariant which characterizes half-mirror planes in the
+3D Brillouin zone, and (b) a bent Chern number: the traditional
+Thouless-Kohmoto-Nightingale-Nijs invariant generalized to bent 2D manifolds.
+Like other well-known topological phases, their band topology is unveiled by
+the crystalline analog of Berry phases, i.e., parallel transport across certain
+non-contractible loops in the Brillouin zone. We also identify certain
+topological phases without any robust surface modes - they are uniquely
+distinguished by parallel transport along bent loops, whose shapes are
+determined by the symmetry group. Finally, we describe the Weyl semimetallic
+phase that intermediates two distinct, gapped phases.",1411.3338v1
+2014-12-03,Electronic structure of quasi-one-dimensional superconductor K$_2$Cr$_3$As$_3$ from first-principles calculations,"The electronic structure of quasi-one-dimensional superconductor
+K$_2$Cr$_3$As$_3$ is studied through systematic first-principles calculations.
+The ground state of K$_2$Cr$_3$As$_3$ is paramagnetic but very close to a
+ferromagnetic instability. Close to the Fermi level, the Cr-3d$_{z^2}$,
+d$_{xy}$, and d$_{x^2-y^2}$ orbitals dominate the electronic states, and three
+bands cross $E_F$ to form one 3D Fermi surface sheet and two quasi-1D sheets.
+The electron DOS at $E_F$ is less than 1/3 of the experimental value,
+indicating an intermediate electron renormalization factor around $E_F$.
+Despite of the relatively small atomic numbers, the antisymmetric spin-orbit
+coupling splitting is sizable ($\approx$ 60 meV) on the 3D Fermi surface sheet
+as well as on one of the quasi-1D sheets. Finally, the imaginary part of bare
+electron susceptibility shows large peaks at $\Gamma$, suggesting the existence
+of large ferromagnetic spin fluctuation in the compound.",1412.1309v2
+2014-12-12,Doping-dependent bandwidth renormalization and spin-orbit coupling in (Sr$_{1-x}$La$_x$)$_2$RhO$_4$,"We investigate the electronic structure of (Sr$_{1-x}$La$_x$)$_2$RhO$_4$
+using a combination of the density functional and dynamical mean-field
+theories. Unlike the earlier local density approximation plus Hubbard $U$
+(LDA+U) studies, we find no sizable enhancement of the spin-orbit splitting due
+to electronic correlations and show that such an enhancement is a spurious
+effect of the static mean-field approximation of the LDA+U method. The electron
+doping suppresses the importance of electronic correlations, which is reflected
+in quasi-particle bandwidth increasing with $x$. (Sr$_{1-x}$La$_x$)$_2$RhO$_4$
+can be classified as weakly correlated metal, which becomes an itinerant
+in-plane ferromagnet (but possibly A-type antiferromagnet) due to Stoner
+instability around $x=0.2$.",1412.4766v2
+2015-04-15,Triangular lattice exciton model,"We present a minimalistic equilateral triangular lattice model, from which we
+derive electron and exciton band structures for semiconducting transition-metal
+dichalcogenides. With explicit consideration of the exchange interaction, this
+model is appropriate across the spectrum from Wannier to Frenkel excitons. The
+single-particle contributions are obtained from a nearest-neighbor
+tight-binding model parameterized using the effective mass and spin-orbit
+coupling. The solutions to the characteristic equation, computed in direct
+space, are in qualitative agreement with first-principles calculations and
+highlight the inadequacy of the two-dimensional hydrogen model to describe the
+lowest-energy exciton bands. The model confirms the lack of subshell degeneracy
+and shows that the A-B exciton split depends on the electrostatic environment
+as well as the spin-orbit interaction.",1504.04040v1
+2015-07-21,Induced p-wave superconductivity without spin-orbit interactions,"The study of Majorana fermions is of great importance for the implementation
+of a quantum computer. These modes are topologically protected and very stable.
+It is now well known that a p-wave superconducting wire can sustain, in its
+topological non-trivial phase, Majorana quasi-particles at its ends. Since this
+type of superconductor is not found in nature, many methods have been devised
+to implement it. Most of them rely on the spin-orbit interaction. In this paper
+we study the superconducting properties of a two-band system in the presence of
+antisymmetric hybridization. We consider inter-band attractive interactions and
+also an attractive interaction in one of the bands. We show that
+superconducting fluctuations with p-wave character are induced in the
+non-interacting band due to the combined effects of inter-band coupling and
+hybridization. In the case of a wire, this type of induced superconductivity
+gives rise to four Majorana modes at its ends. The long range correlation
+between the different charge states of these modes offers new possibilities for
+the implementation of protected q-bits.",1507.05906v1
+2015-07-22,Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials,"Recently, the effects of spin-orbit coupling (SOC) in correlated materials
+have become one of the most actively studied subjects in condensed matter
+physics, as correlations and SOC together can lead to the discovery of new
+phases. Among candidate materials, iridium oxides (iridates) have been an
+excellent playground to uncover such novel phenomena. In this review, we
+discuss recent progress in iridates and related materials, focusing on the
+basic concepts, relevant microscopic Hamiltonians, and unusual properties of
+iridates in perovskite- and honeycomb-based structures. Perspectives on SOC and
+correlation physics beyond iridates are also discussed.",1507.06323v1
+2015-10-01,"Line-Node Dirac Semimetal and Topological Insulating Phase in Noncentrosymmetric Pnictides CaAgX (X = P, As)","Two noncentrosymmetric ternary pnictides, CaAgP and CaAgAs, are reported as
+topological line-node semimetals protected solely by mirror-reflection
+symmetry. The band gap vanishes on a circle in momentum space, and surface
+states emerge within the circle. Extending this study to spin-orbit coupled
+systems reveals that, compared with CaAgP, a substantial band gap is induced in
+CaAgAs by large spin-orbit interaction. The resulting states are a topological
+insulator, in which the Z2 topological invariant is given by 1; 000. To clarify
+the Z2 topological invariants for time-reversal-invariant systems without
+spatial-inversion symmetry, we introduce an alternative way to calculate the
+invariants characterizing a line node and topological insulator for
+mirror-reflection-invariant systems.",1510.00202v3
+2016-01-09,Pressure enhanced thermoelectric properties in Mg2Sn,"Pressure dependence of electronic structures and thermoelectric properties of
+$\mathrm{Mg_2Sn}$ are investigated by using a modified Becke and Johnson (mBJ)
+exchange potential, including spin-orbit coupling (SOC). The corresponding
+value of spin-orbit splitting at $\Gamma$ point is 0.47 eV, which is in good
+agreement with the experimental value 0.48 eV. With the pressure increasing,
+the energy band gap first increases, and then decreases. In certain doping
+range, the power factor for n-type has the same trend with energy band gap,
+when the pressure increases. Calculated results show that the pressure can lead
+to significantly enhanced power factor in n-type doping below the critical
+pressure, and the corresponding lattice thermal conductivity near the critical
+pressure shows the relatively small value. These results make us believe that
+thermoelectric properties of $\mathrm{Mg_2Sn}$ can be improved in n-type doping
+by pressure.",1601.02079v1
+2016-04-13,Terahertz Spin-Orbital Excitations in the paramagnetic state of multiferroic Sr$_2$FeSi$_2$O$_7$,"We studied the novel multiferroic material Sr$_2$FeSi$_2$O$_7$, and found 3
+absorption modes above the magnetic ordering transition temperature using
+time-domain terahertz spectroscopy. These absorption modes can be explained as
+the optical transitions between the spin-orbit coupling and crystal field split
+3d$^6$ Fe$^{2+}$ ground state term in this material. Consideration of the
+compressed tetrahedral environment of the Fe$^{2+}$ site is crucial to
+understand the excitations. We point out, however, discrepancies between the
+single-site atomic picture and the experimental results.",1604.03771v2
+2016-04-18,Superconductivity in doped Dirac semimetals,"We theoretically study intrinsic superconductivity in doped Dirac semimetals.
+Dirac semimetals host bulk Dirac points, which are formed by doubly degenerate
+bands, so the Hamiltonian is described by a $4 \times 4$ matrix and six types
+of $k$-independent pair potentials are allowed by the Fermi-Dirac statistics.
+We show that the unique spin-orbit coupling leads to characteristic
+superconducting gap structures and $d$ vectors on the Fermi surface and the
+electron-electron interaction between intra and interorbitals gives a novel
+phase diagram of superconductivity. It is found that when the inter-orbital
+attraction is dominant, an unconventional superconducting state with point
+nodes appears. To verify the experimental signature of possible superconducting
+states, we calculate the temperature dependence of bulk physical properties
+such as electronic specific heat and spin susceptibility and surface state. In
+the unconventional superconducting phase, either dispersive or flat Andreev
+bound states appear between point nodes, which leads to double peaks or single
+peak in the surface density of states, respectively. As a result, possible
+superconducting states can be distinguished by combining bulk and surface
+measurements.",1604.05081v2
+2016-07-14,Presence of Exotic Electronic Surface States in LaBi and LaSb,"Extremely high magnetoresistance (XMR) in the lanthanum monopnictides La$X$
+($X$ = Sb, Bi) has recently attracted interest in these compounds as candidate
+topological materials. However, their perfect electron-hole compensation
+provides an alternative explanation, so the possible role of topological
+surface states requires verification through direct observation. Our
+angle-resolved photoemission spectroscopy (ARPES) data reveal multiple
+Dirac-like surface states near the Fermi level in both materials. Intriguingly,
+we have observed circular dichroism in both surface and near-surface bulk
+bands. Thus the spin-orbit coupling-induced orbital and spin angular momentum
+textures may provide a mechanism to forbid backscattering in zero field,
+suggesting that surface and near-surface bulk bands may contribute strongly to
+XMR in La$X$. The extremely simple rock salt structure of these materials and
+the ease with which high-quality crystals can be prepared suggests that they
+may be an ideal platform for further investigation of topological matter.",1607.04178v2
+2016-09-29,Modulational instability and solitary waves in polariton topological insulators,"Optical microcavities supporting exciton-polariton quasi-particles offer one
+of the most powerful platforms for investigation of rapidly developing area of
+topological photonics in general, and of photonic topological insulators in
+particular. Energy bands of the microcavity polariton graphene are readily
+controlled by magnetic field and influenced by the spin-orbit coupling effects,
+a combination leading to formation of linear unidirectional edge states in
+polariton topological insulators as predicted very recently. In this work we
+depart from the linear limit of non-interacting polaritons and predict
+instabilities of the nonlinear topological edge states resulting in formation
+of the localized topological quasi-solitons, which are exceptionally robust and
+immune to backscattering wavepackets propagating along the graphene lattice
+edge. Our results provide a background for experimental studies of nonlinear
+polariton topological insulators and can influence other subareas of photonics
+and condensed matter physics, where nonlinearities and spin-orbit effects are
+often important and utilized for applications.",1609.09533v1
+2017-08-07,"Chiral damping, chiral gyromagnetism and current-induced torques in textured one-dimensional Rashba ferromagnets","We investigate Gilbert damping, spectroscopic gyromagnetic ratio and
+current-induced torques in the one-dimensional Rashba model with an additional
+noncollinear magnetic exchange field. We find that the Gilbert damping differs
+between left-handed and right-handed N\'eel-type magnetic domain walls due to
+the combination of spatial inversion asymmetry and spin-orbit interaction
+(SOI), consistent with recent experimental observations of chiral damping.
+Additionally, we find that also the spectroscopic $g$ factor differs between
+left-handed and right-handed N\'eel-type domain walls, which we call chiral
+gyromagnetism. We also investigate the gyromagnetic ratio in the Rashba model
+with collinear magnetization, where we find that scattering corrections to the
+$g$ factor vanish for zero SOI, become important for finite spin-orbit
+coupling, and tend to stabilize the gyromagnetic ratio close to its
+nonrelativistic value.",1708.02008v2
+2018-02-27,Spin-orbit and anisotropic strain effects on the electronic correlations of Sr$_2$RuO$_4$,"We present an implementation of the rotationally invariant slave boson
+technique as an impurity solver for density functional theory plus dynamical
+mean field theory (DFT+DMFT). Our approach provides explicit relations between
+quantities in the local correlated subspace treated with DMFT and the Bloch
+basis used to solve the DFT equations. In particular, we present an expression
+for the mass enhancement of the quasiparticle states in reciprocal space. We
+apply the method to the study of the electronic correlations in Sr$_2$RuO$_4$
+under anisotropic strain. We find that the spin-orbit coupling plays a crucial
+role in the mass enhancement differentiation between the quasi-one-dimensional
+$\alpha$ and $\beta$ bands, and on its momentum dependence over the Fermi
+surface. The mass enhancement, however, is only weakly affected by either
+uniaxial or biaxial strain, even across the Lifshitz transition induced by the
+strain.",1802.10150v1
+2018-04-17,Ultrasensitive multi-mode ESR probed ferromagnetic two-level system of $Mn^{4+}$ impurity ion in the insulated $MnO_6$ complex of $SrLaAlO_4$ at $20~mK$,"Ultrasnsitive multi-mode electron spin resonance spectroscopy in the
+$SrLaAlO_4$ dielectric resonator at $20~mK$ reveals ferromagnetic states of
+$Mn^{4+}$ impurity ion. The formation of ferromagnetic states in the $MnO_6$
+complex implies to oxygen deficiency of this multi-valence $Mn^{4+}$ ion.
+Experiment results supports that an intricate electronic hybridization in
+$MnO_6$ structural instability is related to Pseudo Jahn-Teller effect.
+Measured dipolar hyperfine structure parameter of nucleus is
+$P_{\scriptscriptstyle\parallel} =-3.7\times 10^{-4}~cm^{-1}$. Mean inverse
+third power of the electron distance is $\langle r_q^{-3}\rangle=3.325~a.u.$
+assuming nuclear electric quadruple moment $Q=+0.33(1)~barn$. In such a state,
+giant g-factor is observed due to magneto (ferromagnetic) impedance taking in
+to account a two-level system on the adiabatic-potential-energy-surface. The
+spins exhibited parity is opposite in the interaction of
+highest-occupied-molecular-orbital and lowest-unoccupied-molecular-orbital
+coupling.",1804.06320v1
+2018-04-26,Resonant reflection of interacting electrons from an impurity in a quantum wire: interplay of Zeeman and spin-orbit effects,"A single-channel quantum wire with two well-separated Zeeman subbands and in
+the presence of a weak spin-orbit coupling is considered. An impurity level
+which is split off the upper subband is degenerate with the continuum of the
+lower subband. We show that, when the Fermi level lies in the vicinity of the
+impurity level, the transport is completely blocked. This is the manifestation
+of the effect of resonant reflection and can be viewed as resonant tunneling
+between left-moving and right-moving electrons via the impurity level. We
+incorporate electron-electron interactions and study their effect on the shape
+of the resonant-reflection profile. This profile becomes a two-peak structure,
+where one peak is caused by resonant reflection itself, while the origin of the
+other peak is reflection from the Friedel oscillations of the electron density
+surrounding the impurity.",1804.10283v1
+2020-07-11,Ferromagnetic Weyl Fermions in Two-Dimensional Layered Electride Gd$_2$C,"Recently, two-dimensional layered electrides have emerged as a new class of
+materials which possess anionic electron layers in the interstitial spaces
+between cationic layers. Here, based on first-principles calculations, we
+discover a time-reversal-symmetry-breaking Weyl semimetal phase in a unique
+two-dimensional layered ferromagnetic (FM) electride Gd$_2$C. It is revealed
+that the crystal field mixes the interstitial electron states and Gd 5$d$
+orbitals near the Fermi energy to form band inversions. Meanwhile, the FM order
+induces two spinful Weyl nodal lines (WNLs), which are converted into multiple
+pairs of Weyl nodes through spin-orbit coupling. Further, we not only identify
+Fermi-arc surface states connecting the Weyl nodes but also predict a large
+intrinsic anomalous Hall conductivity due to the Berry curvature produced by
+the gapped WNLs. Our findings demonstrate the existence of Weyl fermions in the
+room-temperature FM electride Gd$_2$C, therefore offering a new platform to
+investigate the intriguing interplay between electride materials and magnetic
+Weyl physics.",2007.05695v1
+2020-07-14,Unveiling Giant Hidden Rashba Effects in Two-Dimensional Si$_2$Bi$_2$,"Recently, it has been known that the hidden Rashba (R-2) effect in
+two-dimensional materials gives rise to a novel physical phenomenon called
+spin-layer locking (SLL). However, not only has its underlying fundamental
+mechanism been unclear, but also there are only a few materials exhibiting weak
+SLL. Here, through the first-principles density functional theory and model
+Hamiltonian calculation, we reveal that the R-2 SLL can be determined by the
+competition between the sublayer-sublayer interaction and the spin-orbit
+coupling (SOC), which is related to the Rashba strength. In addition, the
+orbital angular momentum distribution is another crucial point to realize the
+strong R-2 SLL. We propose that a novel 2D material Si$_2$Bi$_2$ possesses an
+ideal condition for the strong R-2 SLL, whose Rashba strength is evaluated to
+be 2.16 eV{\AA}, which is the greatest value ever observed in 2D R-2 materials
+to the best of our knowledge. Furthermore, we reveal that the interlayer
+interaction in a bilayer structure ensures R-2 states spatially farther apart,
+implying a potential application in spintronics.",2007.06742v2
+2018-05-09,Nature of the Magnetic Interactions in Sr$_3$NiIrO$_6$,"Iridates abound with interesting magnetic behaviours because of their strong
+spin-orbit coupling. Sr$_3$NiIrO$_6$ brings together the spin-orbital
+entanglement of the Ir$^{4+}$ ion with a 3$d$ Ni cation and a one-dimensional
+crystal structure. It has a ferrimagnetic ground state with a 55 T coercive
+field. We perform a theoretical study of the magnetic interactions in this
+compound, and elucidate the role of anisotropic symmetric exchange as the
+source of its strong magnetic anisotropy. Our first-principles calculations
+reproduce the magnon spectra of this compound and predict a signature in the
+cross sections that can differentiate the anisotropic exchange from single-ion
+anisotopy.",1805.03733v2
+2018-05-18,Band crossings in honeycomb-layered transition metal compounds,"Two-dimensional electron dispersions with peculiar band crossings provide a
+platform for realizing topological phases of matter. Here we theoretically show
+that the $e_g$-orbital manifold of honeycomb-layered transition metal compounds
+accommodates a plethora of peculiar band crossings, such as multiple Dirac
+point nodes, quadratic band crossings, and line nodes. From the tight-binding
+analysis, we find that the band topology is systematically changed by the
+orbital dependent transfer integrals on the honeycomb network of edge-sharing
+octahedra, which can be modulated by distortions of the octahedra as well as
+chemical substitutions. The band crossings are gapped out by the spin-orbit
+coupling, which brings about a variety of topological phases distinguished by
+the spin Chern numbers. The results provide a comprehensive understanding of
+the previous studies on various honeycomb compounds. We also propose another
+candidate materials by ab initio calculations.",1805.07068v2
+2018-05-21,Proximitized Materials,"Advances in scaling down heterostructures and having an improved interface
+quality together with atomically-thin two-dimensional materials suggest a novel
+approach to systematically design materials. A given material can be
+transformed through proximity effects whereby it acquires properties of its
+neighbors, for example, becoming superconducting, magnetic, topologically
+nontrivial, or with an enhanced spin-orbit coupling. Such proximity effects not
+only complement the conventional methods of designing materials by doping or
+functionalization, but can also overcome their various limitations. In
+proximitized materials it is possible to realize properties that are not
+present in any constituent region of the considered heterostructure. While the
+focus is on magnetic and spin-orbit proximity effects with their applications
+in spintronics, the outlined principles provide also a broader framework for
+employing other proximity effects to tailor materials and realize novel
+phenomena.",1805.07942v1
+2013-09-20,Jeff=1/2 Mott spin-orbit insulating state close to the cubic limit in Ca4IrO6,"The Jeff=1/2 state is manifested in systems with large cubic crystal field
+splitting and spin-orbit coupling that are comparable to the on-site Coulomb
+interaction, U. 5d transition metal oxides host parameters in this regime and
+strong evidence for this state in Sr2IrO4, and additional iridates, has been
+presented. All the candidates, however, deviate from the cubic crystal field
+required to provide an unmixed canonical Jeff=1/2 state, impacting the
+development of a robust model of this novel insulating and magnetic state. We
+present results that not only show Ca4IrO6 hosts the state, but furthermore
+uniquely resides close to the ideal case required for an unmixed Jeff=1/2
+state.",1309.5411v1
+2014-05-07,Many-body and spin-orbit effects on direct-indirect band gap transition of strained monolayer MoS$_2$ and WS$_2$,"Monolayer transition metal dichalcogenides are promising materials for
+photoelectronic devices. Among them, molybdenum disulphide (MoS$_2$) and
+tungsten disulphide (WS$_2$) are some of the best candidates due to their
+favorable band gap values and band edge alignments. Here we consider various
+perturbative corrections to the DFT electronic structure, e.g. GW, spin-orbit
+coupling, as well as many-body excitonic and trionic effects, and calculate
+accurate band gaps as a function of homogeneous strain in these materials. We
+show that all of these corrections are of comparable magnitudes and need to be
+included in order to obtain an accurate electronic structure. We calculate the
+strain at which the direct-to-indirect gap transition occurs. After considering
+all contributions, the direct to indirect gap transition strain is found to be
+at 2.7% in MoS$_2$ and 3.9% in WS$_2$. These values are generally higher than
+the previously reported theoretical values.",1405.1699v2
+2014-06-17,Magnetic field resistant quantum interferences in bismuth nanowires based Josephson junctions,"We investigate proximity induced superconductivity in micrometer-long bismuth
+nanowires con- nected to superconducting electrodes with a high critical field.
+At low temperature we measure a supercurrent that persists in magnetic fields
+as high as the critical field of the electrodes (above 11 T). The critical
+current is also strongly modulated by the magnetic field. In certain samples we
+find regular, rapid SQUID-like periodic oscillations occurring up to high
+fields. Other samples ex- hibit less periodic but full modulations of the
+critical current on Tesla field scales, with field-caused extinctions of the
+supercurrent. These findings indicate the existence of low dimensionally, phase
+coherent, interfering conducting regions through the samples, with a subtle
+interplay between orbital and spin contributions. We relate these surprising
+results to the electronic properties of the surface states of bismuth, strong
+Rashba spin-orbit coupling, large effective g factors, and their effect on the
+induced superconducting correlations.",1406.4280v1
+2015-12-18,Substrate-tuning of correlated spin-orbit oxides,"We have systematically investigated substrate-strain effects on the
+electronic structures of two representative Sr-iridates, a correlated-insulator
+Sr$_2$IrO$_4$ and a metal SrIrO$_3$. Optical conductivities obtained by the
+\emph{ab initio} electronic structure calculations reveal that the tensile
+strain shifts the optical peak positions to higher energy side with altered
+intensities, suggesting the enhancement of the electronic correlation and
+spin-orbit coupling (SOC) strength in Sr-iridates. The response of the
+electronic structure upon tensile strain is found to be highly correlated with
+the direction of magnetic moment, the octahedral connectivity, and the SOC
+strength, which cooperatively determine the robustness of $J_{eff}$=1/2 ground
+states. Optical responses are analyzed also with microscopic model calculation
+and compared with corresponding experiments. In the case of SrIrO$_3$, the
+evolution of the electronic structure near the Fermi level shows high
+tunability of hole bands, as suggested by previous experiments.",1512.05932v1
+2015-12-23,Semimetal with both Rarita-Schwinger-Weyl and Weyl excitations,"A relativistic spinor with spin 3/2 is historically called Rarita-Schwinger
+spinor. The right- and left-handed chiral degrees of freedom for the massless
+Rarita-Schwinger spinor are independent and are thought of as the left- and
+right-Weyl fermion with helicity \pm3/2. We study three orbital spin-1/2 Weyl
+semimetals in the strong spin-orbital coupling limit with time reversal
+symmetry breaking. We find that in this limit the systems can be a J_{eff}=1/2
+Weyl semimetal or a J_{eff}=3/2 semimetal, depending on the Fermi level
+position. The latter near Weyl points includes both degrees of freedom of
+Rarita-Schwinger-Weyl and Weyl's. A non-local potential separates the Weyl and
+Rarita-Schwinger-Weyl degrees of freedom and a relativistic
+Rarita-Schwinger-Weyl semimetal emerges. This recipe can be generalized to
+mulit-Weyl semimetal and Weyl fermions with pairing interaction and obtain high
+monopole charges.
+  Similarly, a spatial inversion breaking Raita-Schwinger-Weyl semimetal may
+also emerge.",1512.07460v1
+2016-08-11,Collective magnetic excitations of $C_{4}$ symmetric magnetic states in iron-based superconductors,"We study the collective magnetic excitations of the recently discovered
+$C_{4}$ symmetric spin-density wave states of iron-based superconductors with
+particular emphasis on their orbital character based on an itinerant
+multiorbital approach. This is important since the $C_{4}$ symmetric
+spin-density wave states exist only at moderate interaction strengths where
+damping effects from a coupling to the continuum of particle-hole excitations
+strongly modifies the shape of the excitation spectra compared to predictions
+based on a local moment picture. We uncover a distinct orbital polarization
+inherent to magnetic excitations in $C_{4}$ symmetric states, which provide a
+route to identify the different commensurate magnetic states appearing in the
+continuously updated phase diagram of the iron-pnictide family.",1608.03493v1
+2016-08-25,Hidden multipolar orders of dipole-octupole doublets on a triangular lattice,"Motivated by the recent development in strong spin-orbit-coupled materials,
+we consider the dipole-octupole doublets on the triangular lattice. We propose
+the most general interaction between these unusual local moments. Due to the
+spin-orbit entanglement and the special form of its wavefunction, the
+dipole-octupole doublet has a rather peculiar property under the lattice
+symmetry operation. As a result, the interaction is highly anisotropic in the
+pseudospin space, but remarkably, is uniform spatially. We analyze the ground
+state properties of this generic model and emphasize the hidden multipolar
+orders that emerge from the dipolar and octupolar interactions. We clarify the
+quantum mutual modulations between the dipolar and octupolar orders. We predict
+the experimental consequences of the multipolar orders and propose the
+rare-earth triangular materials as candidate systems for these unusual
+properties.",1608.07008v1
+2017-06-22,Spin-flip doublets of $^9$Be spectrum within a cluster model,"The structure of the $^9$Be low-lying spectrum is studied within the cluster
+model $\alpha+\alpha+n$. In the model the total orbital momentum is fixed for
+each energy level. Thus each level is determined as a member of the spin-flip
+doublet corresponding to the total orbital momentum ($L^\pi=0^+, 2^+,4^+, 1^-,
+2^-,3^-, 4^-$) of the system. The Ali-Bodmer potential (model E) is applied for
+the $\alpha\alpha$ interaction. We employ a local $\alpha n$ potential which
+was constructed to reproduce the $\alpha-n$ scattering data. The Pauli blocking
+is simulated by the repulsive core of the $s$-wave components of these
+potentials. Configuration space Faddeev equations are used to calculate the
+energy of the bound state ($E_{cal.}$=-1.493 MeV v.s. $E_{exp.}$=-1.5735 MeV)
+and resonances. A variant of the method of analytical continuation in the
+coupling constant is applied to calculate the energies of low-lying levels.
+Available $^9$Be spectral data are satisfactorily reproduced by the proposed
+model.",1706.07481v1
+2017-12-05,Self-trapping under the two-dimensional spin-orbit-coupling and spatially growing repulsive nonlinearity,"We elaborate a method for the creation of two- and one-dimensional (2D and
+1D) self-trapped modes in binary spin-orbit (SO)-coupled Bose-Einstein
+condensates (BECs) with the contact repulsive interaction, whose local strength
+grows fast enough from the center to periphery. In particular, an exact
+semi-vortex (SV) solution is found for the anti-Gaussian radial-modulation
+profile. The exact modes are included in the numerically produced family of SV
+solitons. Other families, in the form of mixed modes(MMs), as well as excited
+state of SVs and MMs, are produced too. While the excited states are unstable
+in all previously studied models, they are partially stable in the present one.
+In the 1D version of the system, exact solutions for the counterpart of the
+SVs, namely, \textit{semi-dipole} solitons, are found too. Families of
+semi-dipoles, as well as the 1D version of MMs, are produced numerically.",1712.01430v2
+2018-09-21,Electronic correlations and competing orders in multiorbital dimers: a cluster DMFT study,"We investigate the violation of the first Hund's rule in 4$d$ and 5$d$
+transition metal oxides that form solids of dimers. Bonding states within these
+dimers reduce the magnetization of such materials. We parametrize the dimer
+formation with realistic hopping parameters and find not only regimes, where
+the system behaves as a Fermi liquid or as a Peierls insulator, but also
+strongly correlated regions due to Hund's coupling and its competition with the
+dimer formation. The electronic structure is investigated using the cluster
+dynamical mean-field theory for a dimer in the two-plane Bethe lattice with two
+orbitals per site and $3/8$-filling, that is three electrons per dimer. It
+reveals dimer-antiferromagnetic order of a high-spin (double exchange) state
+and a low-spin (molecular orbital) state. At the crossover region we observe
+the suppression of long-range magnetic order, fluctuation enhancement and
+renormalization of electron masses. At certain interaction strengths the system
+becomes an incoherent antiferromagnetic metal with well defined local moments.",1809.07989v1
+2019-09-08,Evolution of the magnetic and polaronic order of $\rm{Pr_{1/2}Ca_{1/2}MnO_3}$ following an ultrashort light pulse,"The dynamics of electrons, spins and phonons induced by optical femtosecond
+pulses has been simulated for the polaronic crystal
+$\rm{Pr_{1/2}Ca_{1/2}MnO_3}$. The model used for the simulation has been
+derived from first-principles calculations. The simulations reproduce the
+experimentally observed melting of charge/orbital order with increasing
+fluence. The loss of charge order in the high-fluence regime induces a
+transition to a ferromagnetic metal. At low fluence, the dynamics is
+deterministic and coherent phonons are created by the repopulation of
+electronic orbitals, which are strongly coupled to the phonon degrees of
+freedom. In contrast to the low-fluence regime, the magnetic transitions
+occurring at higher fluence can be attributed to a quasi-thermal transition of
+a cold-plasma-like state with hot electrons and cold phonons and spins. The
+findings can be rationalized in a more complete picture of the electronic
+structure that goes beyond the simple ionic picture of charge order.",1909.03412v4
+2019-10-15,Time-Reversal Invariant Topological Superconductivity in Planar Josephson Bijunction,"We consider a Josephson bijunction consisting of a thin $SIS$ $\pi$-Josephson
+junction sandwiched between two-dimensional semiconducting layers with strong
+Rashba spin-orbit interaction. Each of these layers forms an $SNS$ junction due
+to proximity-induced superconductivity. The $SIS$ junction is assumed to be
+thin enough such that the two Rashba layers are tunnel-coupled. We show that,
+by tuning external gates, this system can be controllably brought into a
+time-reversal invariant topological superconducting phase with a Kramers pair
+of Majorana bound states being localized at the end of the normal region for a
+large parameter phase space. In particular, in the strong spin-orbit
+interaction limit, the topological phase can be accessed already in the regime
+of small tunneling amplitudes.",1910.06921v1
+2020-01-03,Self focusing Hybrid Skyrmions in spatially varying canted ferromagnetic systems,"Magnetic skyrmions are quasiparticle configurations in a magnetic film that
+can act as information carrying bits for ultrasmall, all-electronic nonvolatile
+memory. The skyrmions can be nucleated and driven by spin-orbit torque from a
+current driven in a heavy metal underlayer. Along its gyrotropic path, a Magnus
+force can cause a skyrmion to be annihilated at the boundaries. By combining
+interfacial and bulk Dzyaloshinskii-Moriya interactions (DMIs), for instance by
+using a B20 material on top of a heavy metal layer with high spin-orbit
+coupling, it is possible to engineer a hybrid skyrmion that will travel
+parallel to the racetrack with zero Magnus force. We show that by using a
+spatially varying interfacial DMI, a hybrid skyrmion will automatically
+self-focus onto such a track as its domain angle evolves along the path.
+Furthermore, using a gate driven voltage controlled magnetic anisotropy, we can
+control the trajectory of the hybrid skyrmion and its eventual convergence path
+and lane selection in a racetrack geometry.",2001.00729v3
+2020-01-12,Excitonic effect on two-photon absorption of two-dimensional semiconductors: Theory and applications to MoS2 and WS2 monolayers,"Based on the Bethe-Salpeter equation eigenstates, we present a
+first-principles many-body formalism for calculating the two-photon absorption
+(TPA) coefficient of semiconductors. We apply this formalism to calculate the
+TPA spectra of MoS2 and WS2 monolayers. The all-electron full-potential
+linearised augmented-plane wave based functions are used for solving the
+Bethe-Salpeter equation. The calculated spectra are in good agreement with the
+available experimental ones for WS2 monolayer. The calculated TPA spectra
+exhibit significant excitonic effects when compared to those based on the
+independent particle approximation. The physical origin of TPA excitonic
+transitions of MoS2 and WS2 monolayers are revealed by tracing the
+sum-over-states process. We show that the spin-orbit coupling effect leads to
+characteristic double peaks with an interval of half spin-orbit splitting
+energy. These double peaks mainly originate from the transitions at the
+vicinity of K point.",2001.03907v1
+2020-02-12,Effective dynamics for a spin-1/2 particle constrained to a space curve in an electric and magnetic field,"We consider the dynamics of a spin-1/2 particle constrained to move in an
+arbitrary space curve with an external electric and magnetic field applied.
+With the aid of gauge theory, we successfully decouple the tangential and
+normal dynamics and derive the effective Hamiltonian. A new type of quantum
+potential called SU(2) Zeeman interaction appears, which is induced by the
+electric field and couples spin and intrinsic orbital angular momentum. Based
+on the Hamiltonian, we discuss the spin precession for zero intrinsic orbital
+angular momentum case and the energy splitting caused by the SU(2) Zeeman
+interaction for a helix as examples, showing the combined effect of geometry
+and external field. The new interaction may bring new approaches to manipulate
+quantum states in spintronics.",2002.04891v1
+2020-04-19,"Nonsymmorphic nodal-line metals in the two-dimensional rare earth monochalcogenides MX (M = Sc, Y; X = S, Se, Te)","We predict a new family of two-dimensional (2D) rare earth monochalcogenide
+materials MX (M = Sc, Y; X = S, Se, Te). Based on first-principles
+calculations, we confirm their stability and systematically investigate their
+mechanical properties. We find that these materials are metallic and
+interestingly, they possess nodal lines in the low-energy band structure
+surrounding the whole Brillouin zone, protected by nonsymmorphic crystal
+symmetries in the absence of spin-orbit coupling (SOC). SOC opens small energy
+gaps at the nodal line, except for two high-symmetry points, at which fourfold
+degenerate 2D spin-orbit Dirac points are obtained. We show that these
+topological band features are robust under uniaxial and biaxial strains, but
+can be lifted by the shear strain. We also investigate the optical
+conductivities of these materials, and show that the transformation of the band
+structure under strain can be inferred from the optical absorption spectrum.
+Our work reveals a new family of 2D topological metal materials with
+interesting mechanical and electronic properties, which will facilitate the
+study of nonsymmorphic symmetry enabled nodal features in 2D.",2004.08737v1
+2020-12-22,Perovskite oxide heterojunction for Rashba-Dresselhaus assisted antiferromagnetic spintronics,"A major impediment towards realizing technologies based on the emerging
+principles of antiferromagnetic spintronics is the shortage of suitable
+materials. In this paper, we propose a design of polar|nonpolar
+heterostructures of perovskite oxides, where a single unit cell of SrIrO3 is
+sandwiched between a thin film of LaAlO3 and a substrate of SrTiO3. Our
+calculations within the framework of density-functional theory + Hubbard U +
+spin-orbit coupling reveal a two-dimensional conducting layer with electron and
+hole pockets at the interface, exhibiting a strong anisotropic
+Rashba-Dresselhaus effect along with noncollinear antiferromagnetism,
+indicating the possibility of realizing a spin-orbit torque. An insightful
+physical model for the anisotropic Rashba-Dresselhaus effect nicely interprets
+our results, providing an estimate for the Rashba-Dresselhaus coefficients and
+illustrating pseudospin orientation.We also observe a proximity-induced
+prominent Rashba-like effect for Ti 3d empty bands. Our results suggest that
+the heterostructure may possess the essential ingredients for antiferromagnetic
+spintronics, deserving experimental verification.",2012.11868v1
+2017-05-26,Zeeman and spin-orbit effects in the Andreev spectra of nanowire junctions,"We study the energy spectrum and the electromagnetic response of Andreev
+bound states in short Josephson junctions made of semiconducting nanowires. We
+focus on the joint effect of Zeeman and spin-orbit coupling on the Andreev
+level spectra. Our model incorporates the penetration of the magnetic field in
+the proximitized wires, which substantially modifies the spectra. We pay
+special attention to the occurrence of fermion parity switches at increasing
+values of the field and to the magnetic field dependence of the absorption
+strength of microwave-induced transitions. Our calculations can be used to
+extract quantitative information from microwave and tunneling spectroscopy
+experiments, such as the recently reported measurements in Van Woerkom et al.,
+arXiv:1609.00333.",1705.09671v2
+2017-09-27,Sequential localization of a complex electron fluid,"Complex and correlated quantum systems with promise for new functionality
+often involve entwined electronic degrees of freedom. In such materials, highly
+unusual properties emerge and could be the result of electron localization.
+Here, a cubic heavy fermion metal governed by spins and orbitals is chosen as a
+model system for this physics. Its properties are found to originate from
+surprisingly simple low-energy behavior, with two distinct localization
+transitions driven by a single degree of freedom at a time. This result is
+unexpected, but we are able to understand it by advancing the notion of
+sequential destruction of an SU(4) spin-orbital-coupled Kondo entanglement. Our
+results implicate electron localization as a unified framework for strongly
+correlated materials and suggest ways to exploit multiple degrees of freedom
+for quantum engineering.",1709.09376v3
+2018-03-14,Dynamic polarizabilities and magic wavelengths of Sr$^+$ for focused vortex light,"A theory of dynamic polarizability for trapping relevant states of Sr$^+$ is
+presented here when the ions interact with a focused optical vortex. The
+coupling between the orbital and spin angular momentum of the optical vortex
+varies with focusing angle of the beam and is studied in the calculation of the
+magic wavelengths for $5s_{{1}/{2}}\rightarrow 4d_{{3}/{2}, {5}/{2}}$
+transitions of Sr$^+$. The initial state of our interest here is $5s_{{1}/{2}}$
+with $m_J = -1/2$ of which is different possible trapping state compare to our
+recent work on Sr$^+$ [Phys. Rev. A \textbf{97}, 022511 (2018)]. We find
+variation in magic wavelengths and the corresponding polarizabilities with
+different combinations of orbital and spin angular momentum of the vortex beam.
+The variation is very significant when the wavelengths of the beam are in the
+infrared region of electromagnetic spectrum. The calculated magic wavelengths
+will help the experimentalists to trap the ion for performing the high
+precision spectroscopic measurements.",1803.05153v2
+2018-06-13,Magnetic tilting and emergent Majorana spin connection in topological superconductors,"Due to the charge neutral and localized nature of surface Majorana modes,
+detection schemes usually rely on local spectroscopy or interference through
+the Josephson effect. Here, we theoretically study the magnetic response of a
+two-dimensional cone of Majorana fermions localized at the surface of class
+DIII Topological Superconductors. For a field parallel to the surface the
+Zeeman term vanishes and the orbital term induces a Doppler shift of the
+Andreev levels resulting in a tilting of the surface Majorana cone. For fields
+larger than a critical threshold field $H^*$ the system undergoes a transition
+from type I to type II Dirac-Majorana cone. In a spherical geometry the surface
+curvature leads to the emergence of the Majorana spin connection in the tilting
+term via an interplay between orbital and Zeeman, that generates a finite
+non-trivial coupling between negative and positive energy states. Majorana
+modes are thus expected to show a finite response to the applied field, that
+acquires a universal character in finite geometries and opens the way to
+detection of Majorana modes via time-dependent magnetic fields.",1806.05969v2
+2018-06-25,Ferromagnetism above 1000 K in highly cation-ordered double-perovskite insulator Sr3OsO6,"Magnetic insulators have been intensively studied for over 100 years, and
+they, in particular ferrites, are considered to be the cradle of magnetic
+exchange interactions in solids. Their wide range of applications include
+microwave devices and permanent magnets . They are also suitable for spintronic
+devices owing to their high resistivity, low magnetic damping, and
+spin-dependent tunneling probabilities. The Curie temperature is the crucial
+factor determining the temperature range in which any ferri/ferromagnetic
+system remains stable. However, the record Curie temperature has stood for over
+eight decades in insulators and oxides (943 K for spinel ferrite LiFe5O8). Here
+we show that a highly B-site ordered double-perovskite, Sr2(SrOs)O6 (Sr3OsO6),
+surpasses this long standing Curie temperature record by more than 100 K. We
+revealed this B-site ordering by atomic-resolution scanning transmission
+electron microscopy. The density functional theory (DFT) calculations suggest
+that the large spin-orbit coupling (SOC) of Os6+ 5d2 orbitals drives the system
+toward a Jeff = 3/2 ferromagnetic (FM) insulating state. Moreover, the Sr3OsO6
+is the first epitaxially grown osmate, which means it is highly compatible with
+device fabrication processes and thus promising for spintronic applications.",1806.09308v1
+2019-08-15,The nature of the two-peak structure in NiO valence band photoemission,"In spite of extensive studies on NiO and their accomplishments, the rich
+physics still raises unsolved physical problems. In particular, the nature of
+the two-peak structure in the valence band photoemission spectra is still
+controversial. By using \textit{ab initio} LQSGW+DMFT, the two-peak structure
+is shown to be driven by the concerted effect of antiferromagnetic ordering and
+intersite electron hopping. Magnetic ordering in the Ni-$e_{g}$ orbitals splits
+majority- and minority-spin Ni-$t_{2g}$ levels due to local Hund's coupling.
+Strong hybridization between O-$p$ and Ni-$e_g$, a signature of the Zhang-Rice
+bound state formation, boosts oxygen-mediated intersite Ni-$e_g$ orbital
+hopping, resulting in the enhancement of majority-spin Ni $t_{2g}$-$e_{g}$
+splitting. Interestingly, these two splittings of distinct physical origins
+match and give rise to the observed two-peak structure in NiO. Our new
+understanding should be useful in designing advanced devices based on the NiO
+for the hole transport.",1908.05643v1
+2019-08-22,Sensing the spin of an individual Ce adatom,"The magnetic moment of rare earth elements originates from electrons in the
+partially filled 4f orbitals. Accessing this moment electrically by scanning
+tunneling spectroscopy is hampered by shielding of outer-lying orbitals. Here
+we show that we can detect the magnetic moment of an individual Ce atom
+adsorbed on a Cu2N ultrathin film on Cu(100) by using a sensor tip that has its
+apex functionalized with a Kondo screened spin system. We calibrate the sensor
+tip by deliberately coupling it to a well characterized Fe atom. Subsequently,
+we use the splitting of the tip's Kondo resonance when approaching a
+spectroscopically dark Ce atom to sense its magnetic moment.",1908.08267v2
+2019-11-04,Photovoltaic effect generated by spin-orbit interactions,"An AC electric field applied to a junction comprising two spin-orbit coupled
+weak links connecting a quantum dot to two electronic terminals is proposed to
+induce a DC current and to generate a voltage drop over the junction if it is a
+part of an open circuit. This photovoltaic effect requires a junction in which
+mirror reflection-symmetry is broken. Its origin lies in the different fashion
+inelastic processes modify the reflection of electrons from the junction back
+into the two terminals, which leads to uncompensated DC transport. The effect
+can be detected by measuring the voltage drop that is built up due to that DC
+current. This voltage is an even function of the frequency of the AC electric
+field and is {\em not} related to quantum pumping.",1911.01168v3
+2019-11-29,Multiorbital singlet pairing and $d+d$ superconductivity,"Recent experiments in multiband Fe-based and heavy-fermion superconductors
+have challenged the long-held dichotomy between simple $s$- and $d$-wave
+spin-singlet pairing states. Here, we advance several time-reversal-invariant
+irreducible pairings that go beyond the standard singlet functions through a
+matrix structure in the band/orbital space, and elucidate their naturalness in
+multiband systems. We consider the $s\tau_{3}$ multiorbital superconducting
+state for Fe-chalcogenide superconductors. This state, corresponding to a $d+d$
+intra- and inter-band pairing, is shown to contrast with the more familiar $d
++\text{i}d$ state in a way analogous to how the B- triplet pairing phase of
+\enhe superfluid differs from its A- phase counterpart. In addition, we
+construct an analogue of the $s\tau_{3}$ pairing for the heavy-fermion
+superconductor CeCu$_{2}$Si$_{2}$, using degrees-of-freedom that incorporate
+spin-orbit coupling. Our results lead to the proposition that $d$-wave
+superconductors in correlated multiband systems will generically have a
+fully-gapped Fermi surface when they are examined at sufficiently low energies.",1911.13274v3
+2019-12-20,Theory of Four-Wave Mixing of Cylindrical Vector Beams in Optical Fibers,"Cylindrical vector (CV) beams are a set of transverse spatial modes that
+exhibit a cylindrically symmetric intensity profile and a variable polarization
+about the beam axis. They are composed of a non-separable superposition of
+orbital and spin angular momentum. Critically, CV beams are also the eigenmodes
+of optical fiber and, as such, are of wide-spread practical importance in
+photonics and have the potential to increase communications bandwidth through
+spatial multiplexing. Here, we derive the coupled amplitude equations that
+describe the four-wave mixing (FWM) of CV beams in optical fibers. These
+equations allow us to determine the selection rules that govern the
+interconversion of CV modes in FWM processes. With these selection rules, we
+show that FWM conserves the total angular momentum, the sum of orbital and spin
+angular momentum, in the conversion of two input photons to two output photons.
+When applied to spontaneous four-wave mixing, the selection rules show that
+photon pairs can be generated in CV modes directly and can be entangled in
+those modes. Such quantum states of light in CV modes could benefit
+technologies such as quantum key distribution with satellites.",1912.10109v1
+2020-11-23,Spin-orbit-enhanced magnetic surface second-harmonic generation in Sr$_2$IrO$_4$,"An anomalous optical second-harmonic generation (SHG) signal was previously
+reported in Sr$_2$IrO$_4$ and attributed to a hidden odd-parity bulk magnetic
+state. Here we investigate the origin of this SHG signal using a combination of
+bulk magnetic susceptibility, magnetic-field-dependent SHG rotational
+anisotropy, and overlapping wide-field SHG imaging and atomic force microscopy
+measurements. We find that the anomalous SHG signal exhibits a two-fold
+rotational symmetry as a function of in-plane magnetic field orientation that
+is associated with a crystallographic distortion. We also show a change in SHG
+signal across step edges that tracks the bulk antiferromagnetic stacking
+pattern. While we do not rule out the existence of hidden order in
+Sr$_2$IrO$_4$, our results altogether show that the anomalous SHG signal in
+parent Sr$_2$IrO$_4$ originates instead from a surface-magnetization-induced
+electric-dipole process that is enhanced by strong spin-orbit coupling.",2011.11662v1
+2021-04-05,Possible quadrupole order in tetragonal Ba2CdReO6 and chemical trend in the ground states of 5d1 double perovskites,"The synthesis and physical properties of the double perovskite (DP) compound
+Ba2CdReO6 with the 5d1 electronic configuration are reported. Three successive
+phases originating from a spin-orbit-entangled Jeff = 3/2 state, confirmed by
+the reduced effective magnetic moment of 0.72 {\mu}B, were observed upon
+cooling. X-ray diffraction measurements revealed a structural transition from a
+high-temperature cubic structure to a low-temperature tetragonal structure at
+Ts = 170 K, below which the Jeff = 3/2 state was preserved. Magnetization, heat
+capacity, and thermal expansion measurements showed two more electronic
+transitions to a possible quadrupole ordered state at Tq = 25 K, and an
+antiferromagnetic order of dipoles accompanied by a ferromagnetic moment of ~
+0.2 {\mu}B at Tm = 12 K. These properties were compared with those of the
+sister compounds Ba2BReO6 (B = Mg, Zn, and Ca) and the chemical trend is
+discussed in terms of the mean-field theory for spin-orbit-coupled 5d electrons
+[G. Chen et al., Phys. Rev. B 82, 174440 (2010)]. The DP compound Ba2BReO6
+provides a unique opportunity for a systematic investigation on symmetry
+breaking in the presence of multipolar degrees of freedom.",2104.01833v1
+2015-08-23,Asymmetric Magnon Excitation by Spontaneous Toroidal Ordering,"Effects of spontaneous toroidal ordering on magnetic excitation are
+theoretically investigated for a localized spin model that includes a staggered
+Dzyaloshinsky-Moriya interaction and anisotropic exchange interactions, which
+arise from the antisymmetric spin-orbit coupling and the multi-orbital
+correlation effect. We show that the model exhibits a Neel-type
+antiferromagnetic order, which simultaneously accompanies a ferroic toroidal
+order. We find that the occurrence of toroidal order modulates the magnon
+dispersion in an asymmetric way with respect to the wave number: a toroidal
+dipole order on the zigzag chain leads to a band-bottom shift, while a toroidal
+octupole order on the honeycomb lattice gives rise to a valley splitting. These
+asymmetric magnon excitations could be a source of unusual magnetic responses,
+such as nonreciprocal magnon transport. A variety of modulations are discussed
+while changing the lattice and magnetic symmetries. Implications of candidate
+materials for asymmetric magnon excitations are presented.",1508.05627v2
+2016-03-29,Energy-momentum mapping of d-derived Au(111) states in a thin film,"The quantum well states of a film can be used to sample the electronic
+structure of the parent bulk material and determine its band parameters. We
+highlight the benefits of two-dimensional film band mapping, with respect to
+complex bulk analysis, in an angle-resolved photoemission spectroscopy study of
+the 5d states of Au(111). Discrete 5d-derived quantum well states of various
+orbital characters form in Au(111) films and span the width of the
+corresponding bulk bands. For sufficiently thick films, the dispersion of these
+states samples the bulk band edges, as confirmed by first-principles
+calculations, thus providing the positions of the critical points of bulk Au in
+agreement with previously determined values. In turn, this analysis identifies
+several d-like surface states and resonances with large spin-splittings that
+originate from the strong spin-orbit coupling of the Au 5d atomic levels.",1603.08879v1
+2016-10-01,Spin-orbit-induced resonances and threshold anomalies in a reduced dimension Fermi gas,"We calculate the reflection and transmission probabilities in a
+one-dimensional Fermi gas with an equal mixing of the Rashba and Dresselhaus
+spin-orbit coupling (RD-SOC) produced by an external Raman laser field. These
+probabilities are computed over multiple relevant energy ranges within the
+pseudo-potential approximation. Strong scattering resonances are found whenever
+the incident energy approaches either a scattering threshold or a quasi-bound
+state attached to one of the energetically closed higher dispersion branches. A
+striking difference is demonstrated between two very different regimes set by
+the Raman laser intensity, namely between scattering for the single- minimum
+dispersion versus the double-minimum dispersion at the lowest threshold. The
+presence of RD-SOC together with the Raman field fundamentally changes the
+scattering behavior and enables the realization of very different
+one-dimensional theoretical models in a single experimental setup when combined
+with a confinement-induced resonance.",1610.00190v2
+2016-10-07,Symmetries and hybridization in the indirect interaction between magnetic moments in MoS$_{2}$ nanoflakes,"We study the Ruderman-Kittel-Kasuya-Yosida interaction between magnetic
+impurities embedded in $p$-doped transition metal dichalcogenide triangular
+flakes. The role of underlying symmetries is exposed by analyzing the
+interaction as a function of impurity separation along zigzag and armchair
+trajectories, in specific parts of the sample. The large spin-orbit coupling in
+these materials produces strongly anisotropic interactions, including a
+Dzyaloshinskii-Moriya component that can be sizable and tunable. We consider
+impurities hybridized to different orbitals of the host transition-metal and
+identify specific characteristics for onsite and hollow site adsorption. In the
+onsite case, the different components of the interaction have similar
+magnitude, while for the hollow site, the Ising component dominates. We also
+study the dependence of the interaction with the level of hole doping, which
+supplies a further degree of tunability. Our results could provide ways of
+controlling helical long range spin order in magnetic impurity arrays embedded
+in these materials.",1610.02142v2
+2016-10-17,Tunable bandgap and spin-orbit coupling by composition control of MoS$_{2}$ and MoO$_{x}$ (X=2 and 3) compounds,"We report on composition controlled MoS$_{2}$ and MoO$_{x}$ (x=2 and 3)
+compounds electrodeposited on Flourine dopped Tin Oxide (FTO) substrate. It was
+observed that the relative content has systematic electrical and optical
+changes for different thicknesses of layers ranging from $\approx$20 to 540 nm.
+Optical and electrical bandgaps reveals a tuneable behavior by controlling the
+relative content of compounds as well as a sharp transition from p to n-type of
+semiconductivity. Moreover, spin-orbit interaction of Mo 3d doublet enhances by
+reduction of MoO$_{3}$ content in thicker films. Our results convey path-way of
+applying such compounds in optoelectronics and nanoelectronics devices.",1610.05110v1
+2016-12-12,General technique for analytical derivatives of post-projected Hartree-Fock,"In electronic structure theory, the availability of analytical derivative is
+one of the desired features for a method to be useful in practical
+applications, as it allows for geometry optimization as well as computation of
+molecular properties. With the recent advances in the development of
+symmetry-projected Hartree-Fock (PHF) methods, we here aim at further
+extensions by devising the analytic gradients of post-PHF approaches with a
+special focus on spin-extended (spin-projected) configuration interaction with
+single and double substitutions (ECISD). Just like standard single-reference
+methods, the mean-field PHF part does not require the corresponding
+coupled-perturbed equation to be solved, while the correlation energy term
+needs the orbital relaxation effect to be accounted for, unless the underlying
+molecular orbitals are variationally optimized in the presence of the
+correlation energy. We present a general strategy for post-PHF analytical
+gradients, which closely parallels that for single-reference methods, yet
+addressing the major difference between them. The similarity between ECISD and
+multi-reference CI not only in the energy but also in the optimized geometry is
+clearly demonstrated by the numerical examples of ozone and cyclobutadiene.",1612.03521v2
+2017-07-26,Long-range effect of a Zeeman field on the electric current through the helical metal-superconductor interface in Andreev interferometer,"It is shown that the spin-orbit and Zeeman interactions result in phase
+shifts of Andreev-reflected holes in disordered topological insulator, or
+normal Rashba spin-orbit-coupled wires, which are in a contact with an s-wave
+superconductor. Due to interference of the holes reflected through different
+paths in Andreev interferometer the electric current through the contact varies
+depending on the strength and direction of the Zeeman field. It also depends on
+mutual orientations of Zeeman fields in different shoulders of the
+interferometer. Such a nonlocal effect is a result of the long-range coherency
+caused by the superconducting proximity effect. This current has been
+calculated within the semiclassical theory for Green functions of a dirty
+system.",1707.08335v2
+2018-10-05,Chirality-controlled spontaneous currents in spin-orbit coupled superconducting rings,"At a superconductor interface with a ferromagnetic insulator (FI), the FI
+acts to induce a local exchange field within the S layer, which in the presence
+of spin-orbit interaction promotes a phase modulated superconducting state.
+Here we demonstrate that within a thin superconducting loop that is partially
+proximitized by a FI, spontaneous currents form with a
+magnetization-orientation-dependent chirality with sizable shifts in
+Little-Parks oscillations. Furthermore, the critical temperature of the loop is
+also magnetization-orientation-dependent and conversely, the superconducting
+transition itself may influence the magnetization direction. More generally,
+the superconducting region above the FI may serve as a phase battery and so
+offer a new device concept for superconducting spintronics.",1810.02696v1
+2019-05-22,The fine structure of the neutral nitrogen-vacancy center in diamond,"The nitrogen-vacancy (NV) center in diamond is a widely-utilized system due
+to its useful quantum properties. Almost all research focuses on the negative
+charge state (NV$^-$) and comparatively little is understood about the neutral
+charge state (NV$^0$). This is surprising as the charge state often fluctuates
+between NV$^0$, and NV$^-$, during measurements. There are potentially under
+utilized technical applications that could take advantage of NV$^0$, either by
+improving the performance of NV$^-$, or utilizing NV$^0$, directly. However,
+the fine-structure of NV$^0$, has not been observed. Here, we rectify this lack
+of knowledge by performing magnetic circular dichroism (MCD) measurements that
+quantitatively determine the fine-structure of NV$^0$. The observed behavior is
+accurately described by spin-Hamiltonians in the ground and excited states with
+the ground state yielding a spin-orbit coupling of $\lambda = 2.24 \pm 0.05$
+GHz and a orbital $g-$factor of $0.0186 \pm 0.0005$. The reasons why this
+fine-structure has not been previously measured are discussed and
+strain-broadening is concluded to be the likely reason",1905.09037v1
+2019-06-18,"Evidence for bulk nodal loops and universality of Dirac-node arc surface states in ZrGeXc (Xc = S, Se, Te)","We have performed angle-resolved photoemission spectroscopy (ARPES) on
+layered ternary compounds ZrGeXc (Xc = S, Se, and Te) with square Ge lattices.
+ARPES measurements with bulk-sensitive soft-x-ray photons revealed a
+quasi-two-dimensional bulk-band structure with the bulk nodal loops protected
+by glide mirror symmetry of the crystal lattice. Moreover, high-resolution
+ARPES measurements near the Fermi level with vacuum-ultraviolet photons
+combined with first-principles band-structure calculations elucidated a
+Dirac-node-arc surface state traversing a tiny spin-orbit gap associated with
+the nodal loops. We found that this surface state commonly exists in ZrGeXc
+despite the difference in the shape of nodal loops. The present results suggest
+that the spin-orbit coupling and the multiple nodal loops cooperatively play a
+key role in creating the exotic Dirac-node-arc surface states in this class of
+topological line-node semimetals.",1906.07406v1
+2019-06-25,Tunneling spectroscopy of localized states of $\mathrm{WS}_2$ barriers in vertical van der Waals heterostructures,"In transition metal dichalcogenides, defects have been found to play an
+important role, affecting doping, spin-valley relaxation dynamics, and
+assisting in proximity effects of spin-orbit coupling. Here, we study localized
+states in $\mathrm{WS}_2$ and how they affect tunneling through van der Waals
+heterostructures of h-BN/graphene/$\mathrm{WS}_2$/metal. The obtained
+conductance maps as a function of bias and gate voltage reveal single-electron
+transistor behavior (Coulomb blockade) with a rich set of transport features
+including excited states and negative differential resistance regimes. Applying
+a perpendicular magnetic field, we observe a shift in the energies of the
+quantum levels and information about the orbital magnetic moment of the
+localized states is extracted.",1906.10389v1
+2020-03-11,Signatures of Hundness in Kagome Metals,"By means of the density functional theory in combination with the dynamical
+mean-field theory, we tried to examine the electronic structure of hexagonal
+FeGe, in which the Fe atoms form a quasi-2D layered Kagome lattice. We predict
+that it is a representative Kagome metal characterized by orbital selective
+Dirac fermions and extremely flat bands. Furthermore, Fe's 3$d$ electrons are
+strongly correlated. They exhibit quite apparent signatures of electronic
+correlation induced by Hund's rule coupling, such as sizable differentiation in
+band renormalization, non-Fermi-liquid behavior, spin-freezing state, and
+spin-orbital separation. Thus, FeGe can be regarded as an ideal platform to
+study the interplay of Kagome physics and Hundness. 5",2003.05301v1
+2020-03-27,Perspective: Strongly correlated and topological states in [111] grown transition metal oxide thin films and heterostructures,"We highlight recent advances in the theory, materials fabrication, and
+experimental characterization of strongly correlated and topological states in
+[111] oriented transition metal oxide thin films and heterostructures, which
+are notoriously difficult to realize compared to their [001] oriented
+counterparts. We focus on two classes of complex oxides, with the chemical
+formula ABO3 and A2B2O7, where the B sites are occupied by an open-shell
+transition metal ion with a local moment, and the A sites are typically a rare
+earth. The [111] oriented quasi-two-dimensional lattices derived from these
+parent compound lattices can exhibit peculiar geometries and symmetries,
+namely, a buckled honeycomb lattice, as well as kagome and triangular lattices.
+These lattice motifs form the basis for emergent strongly correlated and
+topological states expressed in exotic magnetism, various forms of orbital
+ordering, topological insulators, topological semimetals, quantum anomalous
+Hall insulators, and quantum spin liquids. For transition metal ions with high
+atomic number, spin-orbit coupling plays a significant role and may give rise
+to additional topological features in the electronic band structure and in the
+spectrum of magnetic excitations. We conclude the Perspective by articulating
+open challenges and opportunities in this actively developing field.",2003.12211v1
+2020-09-23,Kondo effects in small bandgap carbon nanotube quantum dots,"We study magnetoconductance of the small bandgap carbon nanotube quantum dots
+in the presence of spin-orbit coupling in the strong correlations regime. The
+finite-U mean field slave boson approach is used to study many-body effects.
+Different degeneracies are restored in magnetic field and Kondo effects of
+different symmetries arise including SU(3) effects of different types. Full
+spin-orbital degeneracy might be recovered for zero field and correspondingly
+SU(4) Kondo effect sets in. We point out on the possibility of the occurrence
+of electron-hole Kondo effects in slanting magnetic fields, which we predict
+will occur in the available magnetic fields for orientation of fields close to
+perpendicular. When the field approaches transverse orientation a crossover
+from SU(2) or SU(3) symmetry into SU(4) is observed.",2009.11052v1
+2021-02-11,Phase transitions in superconductor/ferromagnet bilayer driven by spontaneous supercurrents,"We investigate superconducting phase transition in
+superconductor(S)/ferromagnet(F) bilayer with Rasba spin-orbit interaction at
+S/F interface. This spin-orbit coupling produces spontaneous supercurrents
+flowing inside the atomic-thickness region near the interface, which are
+compensated by the screening Meissner currents [S. Mironov and A. Buzdin, Phys.
+Rev. Lett \textbf{118}, 077001 (2017)]. In the case of thin superconducting
+film the emergence of the spontaneous surface currents causes the increase of
+the superconducting critical temperature and we calculate the actual value of
+the critical temperature shift. We also show that in the case of type-I
+superconducting film this phase transition can be of the first order. In the
+external magnetic field the critical temperature depends on the relative
+orientation of the external magnetic field and the exchange field in the
+ferromagnet. Also we predict the in-plane anisotropy of the critical current
+which may open an alternative way for the experimental observation of the
+spontaneous supercurrents generated by the SOC.",2102.05885v1
+2021-07-01,Impact of the valley orbit coupling on exchange gate for spin qubits in silicon quantum dots,"The presence of degenerate conduction band valleys and how they are mixed by
+interfaces play critical roles in determining electron interaction and spectrum
+in a silicon nanostructure. Here we investigate how the valley phases affect
+the exchange interaction in a symmetric two-electron silicon double quantum
+dot. Through a configuration interaction calculation, we find that exchange
+splitting is suppressed at a finite value of valley phase difference between
+the two dots, and reaches its minimum value ({\sim} 0) when the phase
+difference is {\pi}. Such a suppression can be explained using the Hubbard
+model, through the valley-phase-dependent dressing by the doubly occupied
+states on the ground singlet and triplet states. The contributions of the
+higher orbital states also play a vital role in determining the value of the
+exchange energy in general, which is a crucial parameter for applications such
+as exchange gates for spin qubits.",2107.00732v1
+2021-07-05,Identifying intrinsic and extrinsic mechanisms of anisotropic magnetoresistance with terahertz probes,"Identifying the intrinsic and extrinsic origins of magneto-transport in
+spin-orbit coupled systems has long been a central theme in condensed matter
+physics. However, it has been elusive owing to the lack of an appropriate
+experimental tool. In this work, using terahertz time-domain spectroscopy, we
+unambiguously disentangle the intrinsic and extrinsic contributions to the
+anisotropic magnetoresistance (AMR) of a permalloy film. We find that the
+scattering-independent intrinsic contribution to AMR is sizable and is as large
+as the scattering-dependent extrinsic contribution to AMR. Moreover, the
+portion of intrinsic contribution to total AMR increases with increasing
+temperature due to the reduction of extrinsic contribution. Further
+investigation reveals that the reduction of extrinsic contribution is caused by
+the phonon/magnon-induced negative AMR. Our result will stimulate further
+researches on other spin-orbit-interaction-induced phenomena for which
+identifying the intrinsic and extrinsic contributions is important.",2107.01770v1
+2021-08-26,Fully linear band crossings at high symmetry points in layers: classification and role of spin-orbit coupling and time reversal,"All of 320 layer groups, distributed into 80 clusters - single/double
+ordinary/gray groups - are used to complete systematization of linear (in all
+directions) band crossings and corresponding effective Hamiltonians in
+high-symmetry Brillouin zone points of layered materials, refining and
+expanding in literature existing data. Two- and four-dimensional effective
+Hamiltonians are determined by the allowed (half)integer (co)representations of
+the same dimension in the crossing point and one- or two-dimensional generic
+allowed representations. The resulting dispersion types (having isotropic or
+anisotropic form) are: single cone (with double degenerate crossing point and
+non-degenerate branches, or 4-fold degenerate crossing point with double
+degenerate conical branches), poppy-flower (4-fold degenerate crossing point
+with two pairs of non-degenerate mutually rotated conical branches), and a
+fortune teller (with nodal lines). Transition to double group, enabling to
+include spin-orbit interaction, results in various scenarios at high symmetry
+points: gap closing, gap opening, cone preserving, cone splitting etc.
+Analogously, analyzing ordinary to gray group transitions, the role of time
+reversal symmetry is clarified.",2108.11733v1
+2021-09-08,Spiraling light: from donut modes to a Magnus effect analogy,"The insight that optical vortex beams carry orbital angular momentum (OAM),
+which emerged in Leiden about 30 years ago, has since led to an ever expanding
+range of applications and follow-up studies. This paper starts with a short
+personal account of how these concepts arose. This is followed by a description
+of some recent ideas where the coupling of transverse orbital and spin angular
+momentum (SAM) in tightly focused laser beams produces interesting new effects.
+The deflection of a focused light beam by an atom in the focus is reminiscent
+of the Magnus effect known from aerodynamics. Momentum conservation dictates an
+accompanying light force on the atom, transverse to the optical axis. As a
+consequence, an atom held in an optical tweezer will be trapped at a small
+distance of up to $\lambda/2\pi$ away from the optical axis, which depends on
+the spin state of the atom and the magnetic field direction. This opens up new
+avenues to control the state of motion of atoms in optical tweezers as well as
+potential applications in quantum gates and interferometry.",2109.03937v2
+2021-09-20,Giant anomalous Nernst signal in the antiferromagnet YbMnBi2,"Searching for a high anomalous Nernst effect (ANE) is crucial for
+thermoelectric energy conversion applications because the associated unique
+transverse geometry facilitates module fabrication. Topological ferromagnets
+with large Berry curvatures show high ANEs; however, they face drawbacks such
+as strong magnetic disturbances and low mobility due to high magnetization.
+Herein, we demonstrate that YbMnBi2, a canted antiferromagnet, has a large ANE
+conductivity of ~10 Am-1K-1 that surpasses the common high values (i.e. 3-5
+Am-1K-1) observed so far in ferromagnets. The canted spin structure of Mn
+guarantees a nonzero Berry curvature but generates only a weak magnetization
+three orders of magnitude lower than that of general ferromagnets. The heavy Bi
+with a large spin-orbit coupling enables a high ANE and low thermal
+conductivity, whereas its highly dispersive px/y orbitals ensure low
+resistivity. The high anomalous transverse thermoelectric performance and
+extremely small magnetization makes YbMnBi2 an excellent candidate for
+transverse thermoelectrics.",2109.09382v1
+2021-12-13,Flat Magic Window,"Magic windows (or mirrors) consist of optical devices with a surface
+deformation or thickness distribution devised in such a way to form a desired
+image. The associated image intensity distribution has been shown to be related
+to the Laplacian of the height of the surface relief. We experimentally realize
+such devices with flat optics employing optical spin-to-orbital angular
+momentum coupling, which represent a new paradigm for light manipulation. The
+desired pattern and experimental specifications for designing the flat optics
+was implemented with a re-configurable spatial light modulator which acted as
+the magic mirror. The flat plate, optical spin-to-orbital angular momentum
+coupler, is then fabricated by spatially structuring nematic liquid crystals.
+The plate is used to demonstrate the concept of a polarization-switchable magic
+window, where, depending on the input circular polarization handedness, one can
+display either the desired image or the image resulting from the negative of
+the window's phase.",2112.07053v1
+2022-01-25,"Topological $p_z$-wave nodal-line superconductivity with flat surface bands in the AH$_{x}$Cr${_3}$As${_3}$ (A=Na, K, Rb, Cs) superconductors","We study the pairing symmetry and the topological properties of the
+hydrogen-doped ACr$_3$As$_3$ superconductors. Based on our first-principle band
+structure with spin-orbit-coupling (SOC), we construct tight binding model
+including the on-site SOC terms, equipped with the multi-orbital Hubbard
+interactions. Then using the random-phase-approximation (RPA) approach, we
+calculate the pairing phase diagram of this model. Our RPA results yield the
+triplet pz-wave pairing in the
+($\left(\uparrow\downarrow+\downarrow\uparrow\right)$) spin channel to be the
+leading pairing symmetry all over the experiment relevant hydrogen-doping
+regimes. This pairing state belongs to the spin-U(1)-symmetry protected
+time-reversal-invariant topological nodal-line superconductivity. Determined by
+the momentum-dependent topological invariant Z (kx; ky), the whole (001)
+surface Brillouin zone is covered with topological flat bands with different
+regimes covered with different numbers of flat surface bands, which can be
+detected by the scanning tunneling microscope experiments.",2201.10089v1
+2022-06-08,SmI3: 4f5 honeycomb magnet with spin-orbital entangled Γ7 Kramers doublet,"We report magnetic properties of a 4f-honeycomb iodide SmI3 made up of
+edge-shared network of SmI6 octahedra. High temperature magnetic susceptibility
+indicates {\Gamma}7 Kramers doublet ground state of Sm3+ (4f5) ions stabilized
+by the spin-orbit coupling and octahedral crystal electric field, which
+interact with Sm-I-Sm bond angle nearly 90 degree. Magnetization measurements
+down to 0.1 K detected antiferromagnetic correlations and an anomaly in the
+magnetization curve before saturation without a sign of long-range order.
+Relevance between SmI3 and the antiferromagnetic Kitaev material proposed in
+the 4f-electron system is discussed.",2206.03628v1
+2022-07-06,Study of excited electronic states of the $^{39}$KCs molecule correlated with the K($4^2$S)+Cs($5^2$D) asymptote: experiment and theory,"Using the polarisation labelling spectroscopy, we performed the detailed
+analysis of the level structure of excited electronic states of the $^{39}$KCs
+molecule in the excitation energy interval between 17500~cm$^{-1}$ and
+18600~cm$^{-1}$ above the $v=0$ level of the $X^1\Sigma^+$ ground state. We
+prove that the observed states are strongly coupled by spin-orbit interaction
+above 18200~cm$^{-1}$, as manifested by numerous perturbations in the recorded
+spectra. The spectra are interpreted with the guidance of accurate electronic
+structure calculations on KCs, including potential energy curves, transition
+electric dipole moments, and representation of the spin-orbit interaction with
+a quasi-diabatic effective Hamiltonian approach. The agreement between theory
+and experiment is found remarkable, clearly discriminating among the available
+theoretical data. This study confirms the accuracy of the polarisation
+labelling spectroscopy to analyse highly-excited electronic molecular states
+which present a dense level structure.",2207.02484v1
+2022-07-12,Twistronics of Janus transition metal dichalcogenide bilayers,"Twisted multilayers of two-dimensional (2D) materials are an increasingly
+important platform for investigating quantum phases of matter, and in
+particular, strongly correlated electrons. The moir\'e pattern introduced by
+the relative twist between layers creates effective potentials of
+long-wavelength, leading to electron localization. However, in contrast to the
+abundance of 2D materials, few twisted heterostructures have been studied until
+now. Here we develop a first-principle continuum theory to study the electronic
+bands introduced by moire patterns of twisted Janus transition metal
+dichalcogenides (TMD) homo- and hetero-bilayers. The model includes lattice
+relaxation, stacking-dependent effective mass, and Rashba spin-orbit coupling.
+We then perform a high-throughput generation and characterization of
+DFT-extracted continuum models for more than a hundred possible combinations of
+materials and stackings. Our model predicts that the moir\'e physics and
+emergent symmetries depend on chemical composition, vertical layer orientation,
+and twist angle, so that the minibands wavefunctions can form triangular,
+honeycomb, and Kagome networks. Rashba spin-orbit effects, peculiar of these
+systems, can dominate the moir\'e bandwidth at small angles. Our work enables
+the detailed investigation of Janus twisted heterostructures, allowing the
+discovery and control of novel electronic phenomena.",2207.05788v2
+2022-07-15,Band splitting induced Berry flux and intrinsic anomalous Hall conductivity in NiCoMnGa quaternary Heusler compound,"The anomalous transport properties of Heusler compounds become a hotspot of
+research in recent years due to their unique band structure and possible
+application in spintronics. In this paper, we report the anomalous Hall effect
+in polycrystalline NiCoMnGa quaternary Heusler compound by experimental means
+and theoretical calculations. The experimental anomalous Hall conductivity
+(AHC) was found at about 256 S/cm at 10K with an intrinsic contribution of ~
+121 S/cm. The analysis of Hall data reveals the presence of both extrinsic and
+intrinsic contributions in AHE. Our theoretical calculations show that a pair
+of spin-orbit coupled band formed by the band splitting due to spin-orbit
+interaction (SOI) at the Fermi level produces a finite Berry flux in the system
+that provides the intrinsic AHC about 100 S/cm, which is in good agreement with
+the experiment.",2207.07313v1
+2022-11-14,A computational method to estimate spin-orbital interaction strength in solid state systems,"Spin-orbit coupling (SOC) drives interesting and non-trivial phenomena in
+solid state physics, ranging from topological to magnetic to transport
+properties. Thorough study of such phenomena often require effective models
+where SOC term is explicitly included. However, estimation of SOC strength for
+such models mostly depend on the spectroscopy experiments which can only
+provide a rough estimate. In this work, we provide a simple yet effective
+computational approach to estimate the on-site SOC strength using a combination
+of the $ab$ $initio$ and tight-binding calculations. We demonstrate the wider
+applicability and high sensitivity of our method considering materials with
+varying SOC strengths and the number of SOC active ions. The estimated SOC
+strengths agree well with the proposed values in literature lending support to
+our methodology. This simplistic approach can readily be applied to a wide
+range of materials.",2211.07256v1
+2023-07-12,Giant non-volatile electric field control of proximity induced magnetism in the spin-orbit semimetal SrIrO3,"With its potential for drastically reduced operation power of information
+processing devices, electric field control of magnetism has generated huge
+research interest. Recently, novel perspectives offered by the inherently large
+spin-orbit coupling of 5d transition metals have emerged. Here, we demonstrate
+non-volatile electrical control of the proximity induced magnetism in SrIrO3
+based back-gated heterostructures. We report up to a 700 % variation of the
+anomalous Hall conductivity {\sigma}_AHE and Hall angle {\theta}_AHE as
+function of the applied gate voltage Vg. In contrast, the Curie temperature TC
+= 100K and magnetic anisotropy of the system remain essentially unaffected by
+Vg indicating a robust ferromagnetic state in SrIrO3 which strongly hints to
+gating-induced changes of the anomalous Berry curvature. The electric-field
+induced ferroelectric-like state of SrTiO3 enables non-volatile switching
+behavior of {\sigma}_AHE and {\theta}_AHE below 60 K. The large tunability of
+this system, opens new avenues towards efficient electric-field manipulation of
+magnetism.",2307.06064v2
+2023-07-27,Topological superconductivity with large Chern numbers in a ferromagnetic metal-superconductor heterostructure,"The ferromagnetic metal-superconductor heterostructure with interface Rashba
+spin-orbit hopping is a promising candidate for topological superconductivity.
+We study the interplay between the interface Rashba hopping and the intrinsic
+Dresselhaus spin-orbit coupling in this heterostructure, and demonstrate rich
+topological phases with five distinct Chern numbers. In particular, we find a
+topological state with a Chern number as large as four in the parameter space
+of the heterostructure. We calculate the Berry curvatures that construct the
+Chern numbers, and show that these Berry curvatures induce anomalous thermal
+Hall transport of the superconducting quasiparticles. We reveal chiral edge
+states in the topological phases, as well as helical edge states in the trivial
+phase, and show that the wave functions of these edge states mostly concentrate
+on the ferrometal layer of the heterostructure.",2307.14838v2
+2023-09-16,Anisotropy of Antiferromagnetic Domains in a Spin-orbit Mott Insulator,"The temperature-dependent behavior of magnetic domains plays an essential
+role in the magnetic properties of materials, leading to widespread
+applications. However, experimental methods to access the three-dimensional
+(3D) magnetic domain structures are very limited, especially for
+antiferromagnets. Over the past decades, the spin-orbit Mott insulator iridate
+$Sr_2IrO_4$ has attracted particular attention because of its interesting
+magnetic structure and analogy to superconducting cuprates. Here, we apply
+resonant x-ray magnetic Bragg coherent diffraction imaging to track the
+real-space 3D evolution of antiferromagnetic ordering inside a $Sr_2IrO_4$
+single crystal as a function of temperature, finding that the antiferromagnetic
+domain shows anisotropic changes. The anisotropy of the domain shape reveals
+the underlying anisotropy of the antiferromagnetic coupling strength within
+$Sr_2IrO_4$. These results demonstrate the high potential significance of 3D
+domain imaging in magnetism research.",2309.09091v1
+2023-09-27,Enhancing the Josephson diode effect with Majorana bound states,"We consider phase-biased Josephson junctions with spin-orbit coupling under
+external magnetic fields and study the emergence of the Josephson diode effect
+in the presence of Majorana bound states. We show that junctions having middle
+regions with Zeeman fields along the spin-orbit axis develop a low-energy
+Andreev spectrum that is asymmetric with respect to the superconducting phase
+difference $\phi=\pi$, which is strongly influenced by Majorana bound states in
+the topological phase. This asymmetric Andreev spectrum gives rise to anomalous
+current-phase curves and critical currents that are different for positive and
+negative supercurrents, thus signaling the emergence of the Josephson diode
+effect. While this effect exists even in the trivial phase, it gets enhanced in
+the topological phase due to the spatial nonlocality of Majorana bound states.
+Our work thus establishes the utilization of topological superconductivity for
+enhancing the functionalities of Josephson diodes.",2309.15567v2
+2023-10-23,The role of spin-orbit interaction in low thermal conductivity of Mg$_3$Bi$_2$,"Three-dimensional layered Mg$_3$Bi$_2$ has emerged as thermoelectric material
+due to its high cooling performance at ambient temperature, which benefits from
+its low lattice thermal conductivity and semimetal character. However, the
+semimetal character of Mg$_3$Bi$_2$ is sensitive to spin-orbit coupling (SOC).
+Thus, the underlying origin of low lattice thermal conductivity needs to be
+clarified in the presence of the SOC. In this work, the first-principles
+calculations within the two-channel model are employed to investigate the
+effects of the SOC on the phonon-phonon scattering on the phonon transport of
+Mg$_3$Bi$_2$. Our results show that the SOC strongly reduces the lattice
+thermal conductivity (up to $\sim 35$ %). This reduction originates from the
+influence of the SOC on the transverse acoustic modes involving interlayer
+shearing, leading to weak interlayer bonding and enhancement anharmonicity
+around 50 cm$^{-1}$. Our results clarify the mechanism of low thermal
+conductivity in Mg$_3$Bi$_2$ and support the design of Mg$_3$Bi$_2$-based
+materials for thermoelectric applications.",2310.14639v1
+2023-11-16,Enhanced opposite Imbert-Fedorov shifts of vortex beams for precise sensing of temperature and thickness,"Imbert-Fedorov (IF) shift, which refers to a tiny transverse splitting
+induced by spin-orbit interaction at a reflection/refraction interface, is
+sensitive to the refractive index of a medium and momentum state of incident
+light. Most of studies have focused on the shift for an incident light beam
+with a spin angular momentum (SAM) i.e., circular polarization. Compared to
+SAM, orbital angular momentum (OAM) has infinite dimensions in theory as a new
+degree of freedom of light and plays an important role in light-matter
+coupling. We demonstrate experimentally that the relative IF shifts of vortex
+beams with large opposite OAMs are highly enhanced in resonant structures when
+light refracts through a double-prism structure (DPS), in which the thickness
+and temperature of the air gap are precisely sensed via the observed relative
+IF shifts. The thickness and temperature sensitivities increase as the absolute
+value of opposite OAMs increases. Our results offer a technological and
+practical platform for applications in sensing of thickness and temperature,
+ingredients of environment gas, spatial displacement, chemical substances and
+deformation structure.",2311.09673v1
+2023-12-27,Universal orbital and magnetic structures in infinite-layer nickelates,"We conducted a comparative study of the rare-earth infinite-layer nickelates
+films, RNiO2 (R = La, Pr, and Nd) using resonant inelastic X-ray scattering
+(RIXS). We found that the gross features of the orbital configurations are
+essentially the same, with minor variations in the detailed hybridization. For
+low-energy excitations, we unambiguously confirm the presence of damped
+magnetic excitations in all three compounds. By fitting to a linear spin-wave
+theory, comparable spin exchange coupling strengths and damping coefficients
+are extracted, indicating a universal magnetic structure in the infinite-layer
+nickelates. Interestingly, while signatures of a charge order are observed in
+LaNiO2 in the quasi-elastic region of the RIXS spectrum, it is absent in NdNiO2
+and PrNiO2. This prompts further investigation into the universality and the
+origins of charge order within the infinite-layer inickelates.",2312.16444v1
+2024-01-04,Emergent transverse-field Ising model in $\boldsymbol{d}^\mathbf{4}$ spin-orbit Mott insulators,"Mott-insulating transition metal oxides containing $t_{2g}^4$ ions with
+strong spin-orbit coupling were recently demonstrated to display unusual
+magnetism due to a dynamical mixing of the low-energy multiplet states via
+exchange processes. Here we derive exchange interactions in the situation where
+a tetragonal or trigonal crystal field selects a single relevant excited state
+on top of the singlet ionic ground state, producing an effective
+spin-$\frac12$. We show that these moments universally obey antiferromagnetic
+transverse-field Ising model (TFIM) with an intrinsic transverse field
+generated by the splitting of the two ionic singlets. Using Ru$^{4+}$ as a
+example ion, we provide quantitative estimates of the exchange and illustrate
+the emergent TFIM physics based on phase diagrams and excitation spectra
+obtained for several 2D lattices - square, honeycomb, as well as for the
+frustrated triangular lattice.",2401.02532v1
+2024-02-01,Gate-tunable Josephson diode effect in Rashba spin-orbit coupled quantum dot junctions,"We theoretically explore Josephson diode effect (JDE) in
+superconductor/quantum dot (QD)/superconductor junctions in the presence of a
+magnetic field and Rashba spin-orbit interaction (RSOI). We calculate the
+Josephson current in our QD junction using Keldysh non-equilibrium Green's
+function technique. We show that RSOI can induce JDE in our junction without
+any magnetic field. However, the rectification coefficient (RC) of our QD based
+Josephson diode (JD) is amplified when both are present. Interestingly, the
+sign and magnitude of the RC are highly controllable by the magnetic field and
+RSOI. For realistic RSOI strength in the presence of magnetic field and
+chirality, the RC can be tuned to be as high as $70\%$ by an external gate
+potential, indicating a giant JDE in our QD junction. Our proposed QD based JD
+may serve as a potential superconducting device component.",2402.00817v1
+2024-03-04,Spectroscopic investigations on trivalent ruthenium ions in ruthenium perovskite oxide thin films,"The $d^5$ electron configurations under the crystal field, spin-orbit
+coupling, and Coulomb interaction give rise to a plethora of profound ground
+states. Ruthenium perovskite oxides exhibit a number of unconventional
+properties yet the Ru$^{4+}$ state ($4d^4$) is usually stable in these
+materials. In this regard, Ru$^{3+}$ ions in perovskite materials are expected
+to be a mesmerising playground of $4d^5$ electron configurations. Here, we
+report measurements of x-ray photoemission spectroscopy on recently synthesized
+perovskite ruthenium oxide thin films, LaRuO$_3$ and NdRuO$_3$, whose valence
+state of the ruthenium ions is trivalent. We discuss correlation and spin-orbit
+effects from the valence-band spectra, in particular an additional peak
+structure around 3-5 eV, reminiscent of the so-called 3 eV peak observed in
+Sr$_2$RuO$_4$. Moreover, we find that the core-level spectra of these materials
+are quantitatively different from those in other ruthenates which possess
+Ru$^{4+}$ ions, e.g., SrRuO$_3$. We therefore argue that the core level spectra
+of LaRuO$_3$ and NdRuO$_3$ are peculiar to the Ru$^{3+}$ states.",2403.01853v1
+2024-03-14,Kitaev physics in the two-dimensional magnet NiPSe$_3$,"The Kitaev interaction, found in candidate materials such as
+$\alpha$-RuCl$_3$, occurs through the metal ($M$)-ligand ($X$)-metal ($M$)
+paths of the edge-sharing octahedra because the large spin-orbit coupling (SOC)
+on the metal atoms activates directional spin interactions. Here, we show that
+even in $3d$ transition-metal compounds, where the SOC of the metal atom is
+negligible, heavy ligands can induce bond-dependent Kitaev interactions. In
+this work, we take as an example the $3d$ transition-metal chalcogenophosphate
+NiPSe$_3$ and show that the key is found in the presence of a sizable SOC on
+the Se $p$ orbital, one which mediates the super-exchange between the
+nearest-neighbor Ni sites. Our study provides a pathway for engineering
+enhanced Kitaev interactions through the interplay of SOC strength, lattice
+distortions, and chemical substitutions.",2403.09831v1
+2024-04-01,Electrical-controllable antiferromagnet-based tunnel junction,"Electrical-controllable antiferromagnet tunnel junction is a key goal in
+spintronics, holding immense promise for ultra-dense and ultra-stable
+antiferromagnetic memory with high processing speed for modern information
+technology. Here, we have advanced towards this goal by achieving an
+electrical-controllable antiferromagnet-based tunnel junction of
+Pt/Co/Pt/Co/IrMn/MgO/Pt. The exchange coupling between antiferromagnetic IrMn
+and Co/Pt perpendicular magnetic multilayers results in the formation of
+interfacial exchange bias and exchange spring in IrMn. Encoding information
+states 0 and 1 is realized through the exchange spring in IrMn, which can be
+electrically written by spin-orbit torque switching with high cyclability and
+electrically read by antiferromagnetic tunneling anisotropic magnetoresistance.
+Combining spin-orbit torque switching of both exchange spring andexchange bias,
+16 Boolean logic operation is successfully demonstrated. With both memory and
+logic functionalities integrated into our electrical-controllable
+antiferromagnetic-based tunnel junction, we chart the course toward
+high-performance antiferromagnetic logic-in-memory.",2404.01144v1
+2000-07-28,Orbital and spin Kondo effects in a double quantum dot,"Motivated by recent experiments, in which the Kondo effect has been observed
+for the first time in a double quantum-dot structure, we study electron
+transport through a system consisting of two ultrasmall, capacitively-coupled
+dots with large level spacing and charging energy. Due to strong interdot
+Coulomb correlations, the Kondo effect has two possible sources, the spin and
+orbital degeneracies, and it is maximized when both occur simultaneously. The
+large number of tunable parameters allows a range of manipulations of the Kondo
+physics -- in particular, the Kondo effect in each dot is sensitive to changes
+in the state of the other dot. For a thorough account of the system dynamics,
+the linear and nonlinear conductance is calculated in perturbative and
+non-perturbative approaches. In addition, the temperature dependence of the
+resonant peak heights is evaluated in the framework of a renormalization group
+analysis.",0007469v1
+2003-06-20,Manganites at Quarter Filling: Role of Jahn-Teller Interactions,"We have analyzed different correlation functions in a realistic spin-orbital
+model for half-doped manganites. Using a finite-temperature diagonalization
+technique the CE phase was found in the charge-ordered phase in the case of
+small antiferromagnetic interactions between $t_{2g}$ electrons. It is shown
+that a key ingredient responsible for stabilization of the CE-type spin and
+orbital-ordered state is the cooperative Jahn-Teller (JT) interaction between
+next-nearest Mn$^{+3}$ neighbors mediated by the breathing mode distortion of
+Mn$^{+4}$ octahedra and displacements of Mn$^{+4}$ ions. The topological phase
+factor in the Mn-Mn hopping leading to gap formation in one-dimensional models
+for the CE phase as well as the nearest neighbor JT coupling are not able to
+produce the zigzag chains typical for the CE phase in our model.",0306532v2
+2004-10-29,Level structure and spin-orbit effects in semiconductor nanorod dots,"We investigate theoretically how the spin-orbit Dresselhaus and Rashba
+effects influence the electronic structure of quasi-one-dimensional
+semiconductor quantum dots, similar to those that can be formed inside
+semiconductor nanorods. We calculate electronic energy levels, eigen-functions,
+and effective g-factors for coupled, double dots made out of different
+materials, especially GaAs and InSb. We show that by choosing the form of the
+lateral confinement, the contributions of the Dresselhaus and Rashba terms can
+be tuned and suppressed, and we consider several possible cases of interest. We
+also study how, by varying the parameters of the double-well confinement in the
+longitudinal direction, the effective g-factor can be controlled to a large
+extent.",0411003v1
+2001-08-14,GRECP/5e-MRD-CI calculation of the electronic structure of PbH,"The correlation calculation of the electronic structure of PbH is carried out
+with the Generalized Relativistic Effective Core Potential (GRECP) and
+MultiReference single- and Double-excitation Configuration Interaction (MRD-CI)
+methods. The 22-electron GRECP for Pb is used and the outer core 5s, 5p and 5d
+pseudospinors are frozen using the level-shift technique, so only five external
+electrons of PbH are correlated. A new configuration selection scheme with
+respect to the relativistic multireference states is employed in the framework
+of the MRD-CI method. The [6,4,3,2] correlation spin-orbit basis set is
+optimized in the coupled cluster calculations on the Pb atom using a recently
+proposed procedure, in which functions in the spin-orbital basis set are
+generated from calculations of different ionic states of the Pb atom and those
+functions are considered optimal which provide the stationary point for some
+energy functional. Spectroscopic constants for the two lowest-lying electronic
+states of PbH ($^2\Pi_{1/2}, ^2\Pi_{3/2}$) are found to be in good agreement
+with the experimental data.",0108021v1
+2008-08-12,Anisotropy and Magnetism in the LSDA+U Method,"Consequences of anisotropy (variation of orbital occupation) and magnetism,
+and their coupling, are analyzed for LSDA+U functionals, both the commonly used
+ones as well as less commonly applied functionals. After reviewing and
+extending some earlier observations for an isotropic interaction, the
+anisotropies are examined more fully and related to use with the local density
+(LDA) or local spin density (LSDA) approximations. The total energies of all
+possible integer configurations of an open $f$ shell are presented for three
+functionals, where some differences are found to be dramatic. Differences in
+how the commonly used ""around mean field"" (AMF) and ""fully localized limit""
+(FLL) functionals perform are traced to such differences. The LSDA+U
+interaction term, applied self-consistently, usually enhances spin magnetic
+moments and orbital polarization, and the double-counting terms of both
+functionals provide an opposing, moderating tendency (""suppressing the magnetic
+moment""). The AMF double counting term gives magnetic states a significantly
+larger energy penalty than does the FLL counterpart.",0808.1706v3
+2008-11-13,Heavy baryon spectroscopy in the QCD string model,"QCD string model formulated in the framework of the Field Correlator Method
+(FCM) in QCD is employed to calculate the masses of $\Sigma_c$, $\Xi_c$ and
+recently observed at Tevatron $\Sigma_b$, $\Xi_b$ baryons and their orbital
+excitations.
+  The auxiliary field formalism allows one to write a simple local form of the
+effective Hamiltonian for the three quark system, which comprises both
+confinement and relativistic effects, and contains only universal parameters:
+the string tension $\sigma$, the strong coupling constant $\alpha_s$, and the
+bare (current) quark masses $m_i$. We calculate the hyperfine splitting with
+account of the both perturbative and non--perturbative spin-spin forces between
+quarks in a baryon. For the orbital excitations we estimate the string
+correction for the confinement potential - the leading correction to the
+contribution of the proper inertia of the rotating string. This correction
+lowers the masses of the P-states by 50 MeV. We find our numerical results to
+be in good agreement with experimental data.",0811.2184v1
+2009-05-18,Analog of the spin-orbit induced anomalous Hall effect with quantized radiation,"We demonstrate how the term describing interaction between a single two-level
+atom and two cavity field modes may attain a Rashba form. As an outcome, cavity
+QED provides a testbed for studies of phenomena reminiscent of the spin-orbit
+induced anomalous Hall effect. The effective magnetic field, deriving from the
+non-Abelian gauge potentials rendered by the Rashba coupling, induces a
+transverse force acting on the phase space distributions. Thereby, the phase
+space distributions build up a transverse motion manifesting itself in spiral
+trajectories, rather than circular ones obtained for a zero magnetic field as
+one would acquire for the corresponding Abelian gauge potentials. Utilizing
+realistic experimental parameters, the phenomenon is numerically verified,
+ascertain that it should be realizable with current techniques.",0905.2829v2
+2009-06-19,Liquids in multi-orbital SU(N) Magnets with Ultracold Alkaline Earth Atoms,"In this work we study one family of liquid states of k-orbital SU(N) spin
+systems, focusing on the case of k = 2 which can be realized by ultracold
+alkaline earth atoms trapped in optical lattices, with N as large as 10. Five
+different algebraic liquid states with selectively coupled charge, spin and
+orbital quantum fluctuations are considered. The algebraic liquid states can be
+stabilized with large enough N, and the scaling dimension of physical order
+parameters is calculated using a systematic 1/N expansion. The phase
+transitions between these liquid states are also studied, and all the algebraic
+liquid states discussed in this work can be obtained from one ""mother"" state
+with SU(2) x U(1) gauge symmetry.",0906.3727v3
+2011-04-13,Two component Bose-Hubbard model with higher angular momentum states,"We study a Bose-Hubbard Hamiltonian of ultracold two component gas of spinor
+Chromium atoms. Dipolar interactions of magnetic moments while tuned resonantly
+by ultralow magnetic field can lead to spin flipping. Due to approximate axial
+symmetry of individual lattice site, total angular momentum is conserved.
+Therefore, all changes of the spin are accompanied by the appearance of the
+angular orbital momentum. This way excited Wannier states with non vanishing
+angular orbital momentum can be created. Resonant dipolar coupling of the two
+component Bose gas introduces additional degree of control of the system, and
+leads to a variety of different stable phases. The phase diagram for small
+number of particles is discussed.",1104.2512v3
+2011-07-09,Spin-orbit induced mixed-parity pairing in Sr$_2$RuO$_4$: a quantum many-body calculation,"The unusual superconducting state in Sr$_2$RuO$_4$ has long been viewed as
+being analogous to a superfluid state in liquid $^3$He. Nevertheless,
+calculations based on this odd-parity state are presently unable to completely
+reconcile the properties of Sr$_2$RuO$_4$. Using a self-consistent quantum
+many-body scheme that employs realistic parameters, we are able to model
+several signature properties of the normal and superconducting states of
+Sr$_2$RuO$_4$. We find that the dominant component of the model superconducting
+state is of even parity and closely related to superconducting state for the
+high-$T_c$ cuprates although a smaller odd-parity component is induced by
+spin-orbit coupling. This mixed pairing state gives a more complete
+representation of the complex phenomena measured in Sr$_2$RuO$_4$.",1107.1757v1
+2013-04-01,Realization of 2D Spin-orbit Interaction and Exotic Topological Orders in Cold Atoms,"Majorana zero bound mode exists in the vortex core of a chiral $p+ip$
+superconductor or superfluid, which can be driven from an s-wave pairing state
+by two-dimensional (2D) spin-orbit (SO) coupling. We propose here a novel
+scheme based on realistic cold atom platforms to generate 2D SO interactions in
+a blue-detuned square optical lattice, and predict both the quantum anomalous
+Hall effect and chiral topological superfluid phase in the experimentally
+accessible parameter regimes. This work opens a new direction with experimental
+feasibility to observe non-Abelian topological orders in cold atom systems.",1304.0291v3
+2013-04-23,Aharonov-Casher effect in quantum ring ensembles,"We study the transport of electrons through a single-mode quantum ring with
+electric field induced Rashba spin-orbit interaction that is subjected to an
+in-plane magnetic field and weakly coupled to electron reservoirs. Modelling a
+ring array by ensemble averaging over a Gaussian distribution of energy level
+positions, we predict slow conductance oscillations as a function of the Rashba
+interaction and electron density due to spin-orbit interaction-induced beating
+of the spacings between the levels crossed by the Fermi energy. Our results
+agree with experiments by Nitta c.s., thereby providing an interpretation that
+differs from the ordinary Aharonov-Casher effect in a single ring.",1304.6195v1
+2013-05-17,Proximity-induced unconventional superconductivity in topological insulators,"We study and classify the proximity-induced superconducting pairing in a
+topological insulator (TI)-superconductor (SC) hybrid structure for SCs with
+different symmetries. The Dirac surface state gives a coupling between
+spin-singlet and spin-triplet pairing amplitudes as well as pairing that is odd
+in frequency for p-wave SCs. We also find that all SCs induce pairing that is
+odd in both frequency and orbital (band) index, with oddness in frequency and
+orbital index being completely interchangeable. The different induced pairing
+amplitudes significantly modifies the density of states in the TI surface
+layer.",1305.4142v2
+2013-10-09,Emergent topological and half semimetallic Dirac Fermions at oxide interfaces,"It is highly desirable to combine recent advances in the topological quantum
+phases with technologically relevant materials. Chromium dioxide (CrO2) is a
+half-metallic material, widely used in high-end data storage applications.
+Using first principles calculations, we show via interfacial orbital design
+that a novel class of half semi-metallic Dirac electronic phase emerges at the
+interface CrO2 with TiO2 in both thin film and superlattice configurations,
+with four spin-polarized Dirac points in momentum-space (k-space) band
+structure. When the spin and orbital degrees of freedom are allowed to couple,
+the CrO2/TiO2 superlattice becomes a Chern insulator without external fields or
+additional doping. With topological gaps equivalent to 43 Kelvin and a Chern
+number 2, the ensuing quantization of Hall conductance to 2e^2/h will enable
+potential development of these highly industrialized oxides for applications in
+topologically high fidelity data storage and energy-efficient electronic and
+spintronic devices.",1310.2471v1
+2014-01-13,Antilocalization of Coulomb Blockade in a Ge-Si Nanowire,"The distribution of Coulomb blockade peak heights as a function of magnetic
+field is investigated experimentally in a Ge-Si nanowire quantum dot. Strong
+spin-orbit coupling in this hole-gas system leads to antilocalization of
+Coulomb blockade peaks, consistent with theory. In particular, the peak height
+distribution has its maximum away from zero at zero magnetic field, with an
+average that decreases with increasing field. Magnetoconductance in the
+open-wire regime places a bound on the spin-orbit length ($l_{so}$ < 20 nm),
+consistent with values extracted in the Coulomb blockade regime ($l_{so}$ < 25
+nm).",1401.2948v1
+2014-01-15,Effects of isovector scalar $δ$-meson on hypernuclei,"We analyze the effects of $\delta-$ meson on hypernuclei within the
+frame-work of relativistic mean field theory. The $\delta-$ meson is included
+into the Lagrangian for hypernuclei. The extra nucleon-meson coupling
+($g_\delta$) affects the every piece of physical observables, like binding
+energy, radii and single particle energy of hypernuclei. The lambda mean field
+potential is investigated which is consistent with other predictions. Flipping
+of single particle energy levels are observed with the strength of $g_\delta$
+in the considered hypernuclei as well as normal nuclei. The spin-orbit
+potentials are observed for considered hypernuclei and the effect of $g_\delta$
+on spin-orbit potentials is also analyzed. The calculated single-$\Lambda$
+binding energies ($B_\Lambda$) are quite agreeable with the experimental data.",1401.3608v1
+2014-02-11,Engineering relativistic effects in ferroelectric SnTe,"Spin-orbit coupling is increasingly seen as a rich source of novel phenomena,
+as shown by the recent excitement around topological insulators and Rashba
+effects. We here show that the addition of ferroelectric degrees of freedom to
+a semiconductor featuring topologically-non-trivial properties, such as SnTe,
+merges the intriguing field of spin-orbit-driven physics with non-volatile
+functionalities appealing for spintronics. By using a variety of modelling
+techniques, we show that a strikingly rich sequence of phases can be induced in
+SnTe, when going from a room-temperature cubic phase to a low-temperature
+ferroelectric structure, ranging from a topological crystalline insulator to a
+time-reversal-invariant $Z_2$ topological insulator to a ""ferroelectric Rashba
+semiconductor"", exhibiting a huge electrically-controllable Rashba effect in
+the bulk band structure.",1402.2574v2
+2014-09-30,Majorana Fermions in Ge/Si Hole Nanowires,"We consider Ge/Si core/shell nanowires with hole states coupled to an
+$s$-wave superconductor in the presence of electric and magnetic fields. We
+employ a microscopic model that takes into account material-specific details of
+the band structure such as strong and electrically tunable Rashba-type
+spin-orbit interaction and $g$ factor anisotropy for the holes. In addition,
+the proximity-induced superconductivity Hamiltonian is derived starting from a
+microscopic model. In the topological phase, the nanowires host Majorana
+fermions with localization lengths that depend strongly on both the magnetic
+and electric fields. We identify the optimal regime in terms of the directions
+and magnitudes of the fields in which the Majorana fermions are the most
+localized at the nanowire ends. In short nanowires, the Majorana fermions
+hybridize and form a subgap fermion whose energy is split away from zero and
+oscillates as a function of the applied fields. The period of these
+oscillations could be used to measure the dependence of the spin-orbit
+interaction on the applied electric field and the $g$ factor anisotropy.",1409.8645v2
+2015-02-25,Edge states in graphene-like systems,"The edges of graphene and graphene like systems can host localized states
+with evanescent wave function with properties radically different from those of
+the Dirac electrons in bulk. This happens in a variety of situations, that are
+reviewed here. First, zigzag edges host a set of localized non dispersive state
+at the Dirac energy. At half filling, it is expected that these states are
+prone to ferromagnetic instability, causing a very interesting type of edge
+ferromagnetism. Second, graphene under the influence of external perturbations
+can host a variety of topological insulating phases, including the conventional
+Quantum Hall effect, the Quantum Anomalous Hall (QAH) and the Quantum Spin Hall
+phase, in all of which phases conduction can only take place through
+topologically protected edge states. Here we provide an unified vision of the
+properties of all these edge states, examined under the light of the same one
+orbital tight-binding model. We consider the combined action of interactions,
+spin orbit coupling and magnetic field, which produces a wealth of different
+physical phenomena. We briefly address what has been actually observed
+experimentally.",1502.07112v2
+2015-03-23,Giant magnetothermal conductivity and magnetostriction effect in charge ordered Nd$_{0.8}$Na$_{0.2}$MnO$_{3}$ compound,"We present results on resistivity ($\rho$), magnetization ($M$), thermal
+conductivity ($\kappa$), magnetostriction ($\frac{\Delta L}{L(0)}$) and
+specific heat ($C_{p}$) of charge-orbital ordered antiferromagnetic
+Nd$_{0.8}$Na$_{0.2}$MnO$_{3}$ compound. Magnetic field-induced
+antiferromagnetic/charge-orbital ordered insulating to ferromagnetic metallic
+transition leads to giant magnetothermal conductivity and magnetostriction
+effect. The low-temperature irreversibility behavior in $\rho$, $M$, $\kappa$
+and $\frac{\Delta L}{L(0)}$ due to field cycling together with striking
+similarity among the field and temperature dependence of these parameters
+manifest the presence of strong and complex spin-charge-lattice coupling in
+this compound. The giant magnetothermal conductivity is attributed mainly to
+the suppression of phonon scattering due to the destabilization of spin
+fluctuations and static/dynamic Jahn-Teller distortion by the application of
+magnetic field.",1503.06552v2
+2015-07-13,Spin-orbit interaction driven collective electron-hole excitations in a noncentrosymmetric nodal loop Weyl semimetal,"NbP is one member of a new class of nodal loop semimetals characterized by
+the cooperative effects of spin-orbit coupling (SOC) and a lack of inversion
+center. Here transport and spectroscopic properties of NbP are evaluated using
+density functional theory methods. SOC together with the lack of inversion
+symmetry splits degeneracies, giving rise to ""Russian doll nested"" Fermi
+surfaces containing 4*10$^{-4}$ electron (hole) carriers/f.u. Due to the modest
+SOC strength in Nb, the Fermi surfaces map out the Weyl nodal loops. Calculated
+structure around T$^*$~100 K in transport properties reproduces well the
+observed transport behavior only when SOC is included, attesting to the
+precision of the (delicate) calculations and the stoichiometry of the samples.
+Low energy collective electron-hole excitations (plasmons) in the 20-60 meV
+range result from the nodal loop splitting.",1507.03637v4
+2015-11-30,Spin-orbit driven magnetic insulating state with ${J}_{\mathrm{eff}}\mathbf{=}1/2$ character in a 4d oxide,"The unusual magnetic and electronic ground states of 5d iridates has been
+shown to be driven by intrinsically enhanced spin-orbit coupling (SOC). The
+influence of appreciable but reduced SOC in creating the manifested magnetic
+insulating states in 4d oxides is less clear, with one hurdle being the
+existence of such compounds. Here we present experimental and theoretical
+results on Sr$_4$RhO$_6$ that reveal SOC dominated behavior. Neutron
+measurements show the octahedra are both spatially separated and locally ideal,
+making the electronic ground state susceptible to alterations by SOC. Magnetic
+ordering is observed with a similar structure to an analogous
+${J}_{\mathrm{eff}}\mathbf{=}1/2$ Mott iridate. We consider the underlying role
+of SOC in this rhodate with density functional theory and x-ray absorption
+spectroscopy and find a magnetic insulating ground state with
+${J}_{\mathrm{eff}}\mathbf{=}1/2$ character.",1511.09431v1
+2016-06-18,Potential thermoelectric material $\mathrm{Cs_2[PdCl_4]I_2}$: a first-principles study,"The electronic structures and thermoelectric properties of
+$\mathrm{Cs_2[PdCl_4]I_2}$ are investigated by the first-principles
+calculations and semiclassical Boltzmann transport theory. Both electron and
+phonon transport are considered to attain the figure of merit $ZT$. A modified
+Becke and Johnson (mBJ) exchange potential, including spin-orbit coupling
+(SOC), is employed to investigate electronic part of
+$\mathrm{Cs_2[PdCl_4]I_2}$. It is found that SOC has obvious effect on valence
+bands, producing huge spin-orbital splitting, which leads to remarkable
+detrimental effect on p-type power factor. However, SOC has a negligible
+influence on conduction bands, so the n-type power factor hardly change. The
+temperature dependence of lattice thermal conductivity by assuming an inverse
+temperature dependence is attained from reported ultralow lattice thermal
+conductivity of 0.31 $\mathrm{W m^{-1} K^{-1}}$ at room temperature.
+Calculating scattering time $\tau$ is challenging, but a hypothetical $\tau$
+can be adopted to estimate thermoelectric conversion efficiency. The maximal
+figure of merit $ZT$ is up to about 0.70 and 0.60 with scattering time
+$\tau$=$10^{-14}$ s and $\tau$=$10^{-15}$ s, respectively. These results make
+us believe that $\mathrm{Cs_2[PdCl_4]I_2}$ may be a potential thermoelectric
+material.",1606.05727v1
+2016-06-22,Numerics for the spin orbit equation of Makarov with constant eccentricity,"We present an algorithm for the rapid numerical integration of a
+time-periodic ODE with a small dissipation term that is $C^1$ in the velocity.
+Such an ODE arises as a model of spin-orbit coupling in a star/planet system,
+and the motivation for devising a fast algorithm for its solution comes from
+the desire to estimate probability of capture in various solutions, via Monte
+Carlo simulation: the integration times are very long, since we are interested
+in phenomena occurring on times similar to the formation time of the planets.
+The proposed algorithm is based on the High-order Euler Method (HEM) which was
+described in~\cite{hem}, and it requires computer algebra to set up the code
+for its implementation. The pay-off is an overall increase in speed by a factor
+of about $7.5$ compared to standard numerical methods. Means for accelerating
+the purely numerical computation are also discussed",1606.06946v1
+2016-09-09,Electronic structure and magnetism of samarium and neodymium adatoms on free-standing graphene,"The electronic structure of selected rare-earth atoms adsorbed on a
+free-standing graphene was investigated using methods beyond the conventional
+density functional theory (DFT+U, DFT+HIA and DFT+ED). The influence of the
+electron correlations and the spin-orbit coupling on the magnetic properties
+has been examined. The DFT+U method predicts both atoms to carry local magnetic
+moments (spin and orbital) contrary to a nonmagnetic $f^6$ ($J=0$) ground-state
+configuration of Sm in the gas phase. Application of DFT${}+{}$Hubbard-I (HIA)
+and DFT${}+{}$exact diagonalization (ED) methods cures this problem, and yields
+a nonmagnetic ground state with six $f$ electrons and $J=0$ for the Sm adatom.
+Our calculations show that Nd adatom remains magnetic, with four localized $f$
+electrons and $J=4.0$. These conclusions could be verified by STM and XAS
+experiments.",1609.02725v1
+2018-02-10,Tipping the magnetic instability in paramagnetic Sr$_3$Ru$_2$O$_7$ by Fe impurities,"We report the magnetic and electronic properties of the bilayer ruthenate
+Sr$_3$Ru$_2$O$_7$ upon Fe substitution for Ru. We find that
+Sr$_3$(Ru$_{1-x}$Fe$_x$)$_2$O$_7$ shows a spin-glass-like phase below 4 K for
+$x$ = 0.01 and commensurate E-type antiferromagnetically ordered insulating
+ground state characterized by the propagation vector $q_c$ = (0.25 0.25 0) for
+$x$ $\geq$ 0.03, respectively, in contrast to the paramagnetic metallic state
+in the parent compound with strong spin fluctuations occurring at wave vectors
+$q$ = (0.09 0 0) and (0.25 0 0). The observed antiferromagnetic ordering is
+quasi-two-dimensional with very short correlation length along the $c$ axis, a
+feature similar to the Mn-doped Sr$_3$Ru$_2$O$_7$. Our results suggest that
+this ordered ground state is associated with the intrinsic magnetic instability
+in the pristine compound, which can be readily tipped by the local magnetic
+coupling between the 3$d$ orbitals of the magnetic dopants and Ru 4$d$
+orbitals.",1802.03633v1
+2017-04-19,Anisotropic features in the electronic structure of the two-dimensional transition metal trichalcogenide TiS$_3$: electron doping and plasmons,"Analysis of the band structure of TiS$_3$ single-layers suggests the
+possibility of changing their physical behaviour by injecting electron
+carriers. The anisotropy of the valence and conduction bands is explained in
+terms of their complex orbital composition. The nature of the Fermi surface and
+Lindhard response function for different doping concentrations is studied by
+means of first-principles DFT calculations. It is suggested that for electron
+doping levels $x$ (number of electrons per unit cell) $\sim$ 0.18-0.30$e^-$ the
+system could exhibit incommensurate charge or spin modulations which, however,
+would keep the metallic state whereas systems doped with smaller $x$ would be
+2D metals without any electronic instability. The effect of spin-orbit coupling
+in the band dispersion is analysed. The DFT effective masses are used to study
+the plasmon spectrum from an effective low energy model. We find that this
+material supports highly anisotropic plasmons, with opposite anisotropy for the
+electron and hole bands.",1704.05824v1
+2015-12-16,Observation of spin-orbit insulator-like behavior in LaOBiS$_{2-x}$F$_x$ (0.05 $\leq$ $x$ $\leq$ 0.2),"We report the effects of electron doping on the crystal structure and
+electrical resistivity of LaOBiS$_{2-x}$F$_x$ (0.05 $\leq$ $x$ $\leq$ 0.2). The
+$ab$ plane is found to be relatively insensitive to the amount of F, whereas
+the $c$ axis shrinks continuously with increasing $x$, suggesting that the
+doped F atoms substitute selectively into the apical sites in the BiS$_2$
+layer. At $x$ = 0.10, as the temperature is decreased from room temperature,
+the electrical resistivity is temperature-independent from room temperature to
+285 K, increases linearly with decreasing temperature from 285 K to 205 K and
+then shows obvious insulating behavior below 205 K, which may be due to strong
+spin-orbit coupling. LaOBiS$_{1.9}$F$_{0.1}$ shows the significantly weak and
+temperature-independent diamagnetism without any evident anomalies caused by a
+phase transition.",1512.05070v1
+2019-10-09,Superconductivity from Coulomb repulsion in three-dimensional quadratic band touching Luttinger semimetals,"We study superconductivity driven by screened Coulomb repulsion in
+three-dimensional Luttinger semimetals with a quadratic band touching and
+strong spin-orbit coupling. In these semimetals, the Cooper pairs are formed by
+spin-3/2 fermions with non-trivial wavefunctions. We numerically solve the
+linear Eliashberg equation to obtain the critical temperature of a singlet
+s-wave gap function as a function of doping, with account of spin-orbit and
+self-energy corrections. In order to understand the underlying mechanism of
+superconductivity, we compute the sensitivity of the critical temperature to
+changes in the dielectric function $\epsilon(i\Omega_n,q)$. We relate our
+results to the plasmon and Kohn-Luttinger mechanisms. Finally, we discuss the
+validity of our approach and compare our results to the litterature. We find
+good agreement with some bismuth-based half-Heuslers, such as YPtBi, and
+speculate on superconductivity in the iridate Pr2Ir2O7.",1910.04189v2
+2018-03-13,Gamow-Teller transitions and neutron-proton-pair transfer reactions,"We propose a schematic model of nucleons moving in spin--orbit partner
+levels, $j=l\pm{\sfrac12}$, to explain Gamow--Teller and two-nucleon transfer
+data in $N=Z$ nuclei above $^{40}$Ca. Use of the $LS$ coupling scheme provides
+a more transparent approach to interpret the structure and reaction data.We
+apply the model to the analysis of charge-exchange,
+$^{42}$Ca($^3$He,t)$^{42}$Sc, and np-transfer, $^{40}$Ca($^3$He,p)$^{42}$Sc,
+reactions data to define the elementary modes of excitation in terms of both
+isovector and isoscalar pairs, whose properties can be determined by adjusting
+the parameters of the model (spin--orbit splitting, isovector pairing strength
+and quadrupole matrix element) to the available data. The overall agreement
+with experiment suggests that the approach captures the main physics
+ingredients and provides the basis for a boson approximation that can be
+extended to heavier nuclei. Our analysis also reveals that the SU(4)-symmetry
+limit is not realized in $^{42}$Sc.",1803.04704v1
+2018-03-20,Conductance of fractional Luttinger liquids at finite temperatures,"We study the electrical conductance in single-mode quantum wires with Rashba
+spin-orbit interaction subjected to externally applied magnetic fields in the
+regime in which the ratio of spin-orbit momentum to the Fermi momentum is close
+to an odd integer, so that a combined effect of multi-electron interaction and
+applied magnetic field leads to a partial gap in the spectrum. We study how
+this partial gap manifests itself in the temperature dependence of the
+fractional conductance of the quantum wire. We use two complementing techniques
+based on bosonization: refermionization of the model at a particular value of
+the interaction parameter and a semiclassical approach within a dilute soliton
+gas approximation of the functional integral. We show how the low-temperature
+fractional conductance can be affected by the finite length of the wire, by the
+properties of the contacts, and by a shift of the chemical potential, which
+takes the system away from the resonance condition. We also predict an internal
+resistivity caused by a dissipative coupling between gapped and gapless modes.",1803.07359v1
+2018-08-15,Collective excitations in two-component one-dimensional massless Dirac plasma,"We study spectra of long wavelength plasma oscillations in a system of two
+energy splitted one-dimensional (1D) massless Dirac fermion subbands coupled by
+spin-orbit interaction. Such a system may be formed by edge subbands in
+semiconducting transition metal dichalcogenide monolayers. Intrasubband
+transitions of massless Dirac fermions give rise to optical and acoustic
+gapless branches of intrasubband 1D plasmons. We reveal that the optical branch
+is of quantum character with group velocity being inverse proportional to
+square root of the Planck constant, whereas the acoustic branch is classical
+one with group velocity proportional to geometric mean of the edge subband
+velocities. Spin-orbit interaction, allowing intersubband transitions in the
+system, results in emergence of two branches of intersubband 1D plasmons: upper
+and lower ones. The upper and lower branches are gapped at small wave vectors
+and evolve with positive and negative group velocities, respectively, from
+energy splitting of the edge subbands at Fermi-level. The both intersubband
+branches adjoin intersubband single particle excitation continuum from above,
+while in case of the edge subbands with unequal velocities the lower one
+experiences Landau damping at small wave vectors. In addition, the lower
+branch, attaining zero frequency at a non-zero wave vector, alters its group
+velocity from negative to positive one.",1808.05180v1
+2020-08-19,Spin-Orbit and Strain Induced Modification in Electrical Properties of Monolayer InSb,"In this work, the electrical properties of monolayer InSb in the presence of
+biaxial strain using density functional theory are investigated. Here, we first
+explore the band structure of InSb with and without spin-orbit coupling (SOC)
+consideration. The electron and hole effective mass modify with SOC
+consideration. The electron and hole effective masses lowered two and ten
+times, respectively. The location of valleys in conduction and valence band for
+various strains are explored, and the corresponding effective masses are
+reported. A lower effective mass is obtained for both electron and hole with
+applying tensile strain, whereas, the bandgap closes for large tensile strain.
+A numeric fitting has applied to effective mass versus strain, and an equation
+for every curve is reported. Finally, the work function of this material for
+different strains is obtained.",2008.08266v1
+2020-10-12,Lattice Collective Modes from a Continuum Model of Magic-Angle Twisted Bilayer Graphene,"We show that the insulating states of magic-angle twisted bilayer graphene
+support a series of collective modes corresponding to local particle-hole
+excitations on triangular lattice sites. Our theory is based on a continuum
+model of the magic angle flat bands. When the system is insulating at moir\'e
+band filling $\nu=-3$, our calculations show that the ground state supports
+seven low-energy modes that lie well below the charge gap throughout the
+moir\'e Brillouin zone, one of which couples strongly to THz photons. The
+low-energy collective modes are faithfully described by a model with a local
+$SU(8)$ degree of freedom in each moir\'e unit cell that we identify as the
+direct product of spin, valley, and an orbital pseudospin. Apart from spin and
+valley-wave modes, the collective mode spectrum includes a low-energy
+intra-flavor exciton mode associated with transitions between flat valence and
+conduction band orbitals.",2010.05946v2
+2016-03-30,Effective p-wave interaction and topological superfluids in s-wave quantum gases,"P-wave interaction in cold atoms may give rise to exotic topological
+superfluids. However, the realization of p-wave interaction in cold atom system
+is experimentally challenging. Here we propose a simple scheme to synthesize
+effective $p$-wave interaction in conventional $s$-wave interacting quantum
+gases. The key idea is to load atoms into spin-dependent optical lattice
+potential. Using two concrete examples involving spin-1/2 fermions, we show how
+the original system can be mapped into a model describing spinless fermions
+with nearest neighbor p-wave interaction, whose ground state can be a
+topological superfluid that supports Majorana fermions under proper conditions.
+Our proposal has the advantage that it does not require spin-orbit coupling or
+loading atoms onto higher orbitals, which is the key in earlier proposals to
+synthesize effective $p$-wave interaction in $s$-wave quantum gases, and may
+provide a completely new route for realizing $p$-wave topological superfluids.",1603.09011v1
+2017-07-27,"Analysis of the behavior of singlet pairs in inorganic crystal XOCl(X=Ti,Bi)","This article explore the behavior of singlet pairs in Inorganic crystals and
+take the Ti-Ti and Bi-Bi dimer for example, including the transition in
+critical temperture by directly or indirectly. Through the analysis, It is
+proposed that with the decrease of temperature, the strength of spin-orbit
+coupling (SOC) increases and the phase difference also increases. In the
+one-dimensional spin 1/2 chain system of TiOCl and BiOCl crystals, the
+possibility of reversible parameter modulation is proposed by the calculation
+of the first principle analyzing the process and analysis of the structural
+phase transition process. It's shown that the different sturcture transition is
+relate to the difference of the dimer structure and the fluctuation of orbital
+order through the comparative study of TiOCl and BiOCl.",1707.09033v1
+2017-11-21,3D Topological Kondo Insulators,"Topological Kondo insulators (TKIs) are new type of symmetry-protected
+topological insulators, which develop through the interplay of strong
+correlations and spin-orbit interactions. In these materials, the bulk is a
+perfect band insulator due to Kondo screening of localized moments via
+conduction electrons. Furthermore, strong spin-orbit coupling (SOC) and crystal
+field effect (CFE) of the localized moments result in a nonlocal odd-parity,
+time-reversal invariant hybridization between the local-moments and conduction
+bands, which creates a ground-state with nontrivial topology and gapless
+surface excitations (Physical Review Letters 104 (2010) 106408). In the present
+work, we develop a self-consistent theory to study topological Kondo insulators
+at the mean-field level. To achieve this, we apply slave-boson mean-field
+theory for a system with and without periodic boundary conditions, in order to
+study the system at bulk and slab geometry configuration. This enables us to
+observe a clear signature of protected edge states through band structure and
+calculation of spectral functions.",1711.07976v1
+2017-11-27,Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in Sr2IrO4,"Electrical control of structural and physical properties is a long-sought,
+but elusive goal of contemporary science and technology. We demonstrate that a
+combination of strong spin-orbit interactions (SOI) and a canted
+antiferromagnetic (AFM) Mott state is sufficient to attain that goal. The AFM
+insulator Sr2IrO4 provides a model system in which strong SOI lock canted Ir
+magnetic moments to IrO6-octahedra, causing them to rigidly rotate together. A
+novel coupling between an applied electrical current and the canting angle
+reduces the N\'eel temperature and drives a large, non-linear lattice expansion
+that closely tracks the magnetization, increases the electron mobility, and
+precipitates a unique resistive switching effect. Our observations open new
+avenues for understanding fundamental physics driven by strong SOI in condensed
+matter, and provide a new paradigm for functional materials and devices.",1711.10021v1
+2017-11-30,Magnetic anisotropy by Rashba spin-orbit coupling in antiferromagnetic thin films,"Magnetic anisotropy in an antiferromagnet (AFM) with inversion symmetry
+breaking (ISB) is investigated. The magnetic anisotropy energy (MAE) resulting
+from the Rashba spin-orbit and s-d type exchange interactions is determined for
+two different models of AFMs. The global ISB model, representing the effect of
+a surface, an interface, or a gating electric field, results in an easy-plane
+magnetic anisotropy. In contrast, for a local ISB model, i.e., for a
+noncentrosymmetric AFM, perpendicular magnetic anisotropy (PMA) arises. Both
+results differ from the ferromagnetic case, in which the result for PMA depends
+on the band structure and dimensionality. These MAE contributions play a key
+role in determining the direction of the Neel order parameter in
+antiferromagnetic nanostructures, and reflect the possibility of
+electrical-field control of the Neel vector.",1711.11184v2
+2018-10-06,Sr$_3$Ir$_2$O$_7$F$_2$: Topochemical conversion of a relativistic Mott state into a spin-orbit driven band insulator,"The topochemical transformation of single crystals of Sr$_3$Ir$_2$O$_7$ into
+Sr$_3$Ir$_2$O$_7$F$_2$ is reported via fluorine insertion. Characterization of
+the newly formed Sr$_3$Ir$_2$O$_7$F$_2$ phase shows a nearly complete oxidation
+of Ir$^{4+}$ cations into Ir$^{5+}$ that in turn drives the system from an
+antiferromagnetic Mott insulator with a half-filled J$_{eff}=1/2$ band into a
+nonmagnetic $J=0$ band insulator. First principles calculations reveal a
+remarkably flat insertion energy that locally drives the fluorination process
+to completion. Band structure calculations support the formation of a band
+insulator whose charge gap relies on the strong spin-orbit coupling inherent to
+the Ir metal ions of this compound.",1810.02942v1
+2018-10-11,Coulomb pairing of electrons in thin films with strong spin-orbit interaction,"In low-dimensional structures with strong Rashba spin-orbit interaction
+(SOI), the Coulomb fields between moving electrons produce a SOI component of
+the pair interaction that competes with the potential Coulomb repulsion. If the
+Rashba SOI constant of the material is sufficiently high, the total
+electron-electron interaction becomes attractive, which leads to the formation
+of the two-electron bound states. We show that because of the dielectric
+screening in a thin film the binding energy is significantly higher as compared
+to the case of the bulk screening.",1810.05144v2
+2018-10-30,Novel topological insulators from crystalline symmetries,"We discuss recent advances in the study of topological insulators protected
+by spatial symmetries by reviewing three representative, theoretical examples.
+In three dimensions, these states of matter are generally characterized by the
+presence of gapless boundary states at surfaces that respect the protecting
+spatial symmetry. We discuss the appearance of these topological states both in
+crystals with negligible spin-orbit coupling and a fourfold rotational
+symmetry, as well as in mirror-symmetric crystals with sizable spin-orbit
+interaction characterized by the so-called mirror Chern number. Finally, we
+also discuss similar topological crystalline states in one-dimensional
+insulators, such as nanowires or atomic chains, with mirror symmetry. There,
+the prime physical consequence of the non-trivial topology is the presence of
+quantized end charges.",1810.12877v1
+2021-01-10,Enhancement of spin-orbit coupling in Dirac semimetal Cd$_{3}$As$_{2}$ films by Sb-doping,"We present a study on magnetotransport in films of the topological Dirac
+semimetal Cd$_{3}$As$_{2}$ doped with Sb grown by molecular beam epitaxy. In
+our weak antilocalization analysis, we find a significant enhancement of the
+spin-orbit scattering rate, indicating that Sb doping leads to a strong
+increase of the pristine band-inversion energy. We discuss possible origins of
+this large enhancement by comparing Sb-doped Cd$_{3}$As$_{2}$ with other
+compound semiconductors. Sb-doped Cd$_{3}$As$_{2}$ will be a suitable system
+for further investigations and functionalization of topological Dirac
+semimetals.",2101.03560v1
+2021-03-04,Observation of an Unusual Colossal Anisotropic Magnetoresistance Effect in an Antiferromagnetic Semiconductor,"Searching for novel antiferromagnetic materials with large magnetotransport
+response is highly demanded for constructing future spintronic devices with
+high stability, fast switching speed, and high density. Here we report a
+colossal anisotropic magnetoresistance effect in an antiferromagnetic binary
+compound with layered structure rare-earth dichalcogenide EuTe2. The AMR
+reaches 40000%, which is 4 orders of magnitude larger than that in conventional
+antiferromagnetic alloys. Combined magnetization, resistivity, and theoretical
+analysis reveal that the colossal AMR effect is attributed to a novel mechanism
+of vector-field tunable band structure, rather than the conventional spin-orbit
+coupling mechanism. Moreover, it is revealed that the strong hybridization
+between orbitals of Eu-layer with localized spin and Te-layer with itinerant
+carriers is extremely important for the large AMR effect. Our results suggest a
+new direction towards exploring AFM materials with prominent magnetotransport
+properties, which creates an unprecedented opportunity for AFM spintronics
+applications.",2103.02818v1
+2022-03-09,First-principles study of the electronic and optical properties of Ho$_{\rm W}$ impurities in tungsten disulfide,"The electronic and optical properties of single-layer (SL) tungsten disulfide
+(WS$_2$) in the presence of substitutional Holmium impurities (Ho$_{\rm W}$)
+are studied. Although Ho is much larger than W, density functional theory (DFT)
+including spin-orbit coupling is used to show that Ho:SL WS$_2$ is stable. The
+magnetic moment of the Ho impurity is found to be 4.75$\mu_B$ using
+spin-dependent DFT. The optical selection rules identified in the optical
+spectrum match exactly the optical selection rules derived by means of group
+theory. The presence of neutral Ho$_W$ impurities gives rise to localized
+impurity states (LIS) with f-orbital character in the band structure. Using the
+Kubo-Greenwood formula and Kohn-Sham orbitals we obtain atom-like sharp
+transitions in the in-plane and out-of-plane components of the susceptibility
+tensor, Im$\chi_{\parallel}$ and Im$\chi_{\perp}$. The optical resonances are
+in good agreement with experimental data.",2203.04730v1
+2022-05-18,Dielectric constant of gray Tin: A first-principles study,"$\alpha$-Sn (gray tin) is a group-IV, zero-gap semiconductor with potential
+use in infrared detectors, necessitating a clear understanding of its
+dielectric properties. We report the first-principles calculations of the band
+structure and dielectric function of $\alpha$-Sn using density functional
+theory, emphasizing the effects of strain, spin-orbit interaction, and
+pseudo-potentials on the electronic and optical properties of $\alpha$-Sn in
+the infrared region (photon energy $<$ 1eV). In $\alpha$-Sn, spin-orbit
+coupling greatly influences the electronic band structure that leads to unusual
+optical behavior. We explain an apparently anomalous absorption at $\sim$ 0.41
+eV caused by interbank transitions within the valence band. Infrared
+spectroscopic ellipsometry on several $\alpha$-Sn films grown by molecular beam
+epitaxy validate our band-structure calculations. Our computational methods and
+results are discussed in detail.",2205.08686v3
+2022-06-14,Two bands Ising superconductivity from Coulomb interactions in monolayer NbSe$_2$,"The nature of superconductivity in monolayer transition metal dichalcogenides
+is still an object of debate. It has already been argued that repulsive Coulomb
+interactions, combined with the disjoint Fermi surfaces around the $K$, $K'$
+valleys and at the $\Gamma$ point, can lead to superconducting instabilities in
+monolayer NbSe$_2$. Here, we demonstrate the two bands nature of
+superconductivity in NbSe$_2$. It arises from the competition of repulsive long
+range intravalley and short range intervalley interactions together with Ising
+spin-orbit coupling. The two distinct superconducting gaps, one for each
+spin-orbit split band, consist of a mixture of s-wave and f-wave components.
+Their different amplitudes are due to different normal densities of states of
+the two bands at the Fermi level. Using a microscopic multiband BCS approach,
+we derive and self-consistently solve the gap equation, demonstrating the
+stability of nontrivial solutions in a realistic parameter range. We find a
+universal behavior of the temperature dependence of the gaps and of the
+critical in-plane field which is consistent with various sets of existing
+experimental data.",2206.06645v1
+2022-09-23,Charging/discharging mechanism in Mg3Bi2 anode for Mg-ion batteries; The role of the spin-orbit coupling,"Using density functional calculations, we examine insertion/extraction of Mg
+ions in Mg3Bi2, an interesting Mg-ion battery anode. We found that a (1 1 0)
+facet is the most stable termination. Vacating a Mg2+ ion from the octahedral
+site is more favourable for both surface and bulk regions of the material.
+However, the diffusion barriers among the tetrahedral sites are around 3 times
+smaller than those among octahedral sites. Consequently, during the
+magnesiation/demagnesiation process, Mg ions first vacate the octahedral sites
+and then diffuse through the tetrahedral sites. The spin-orbit interaction
+lowers Mg's vacancy formation energy but has a minor effect on diffusion
+barriers.",2209.11513v1
+2022-10-11,"Effects of charge doping on Mott insulator with strong spin-orbit coupling, Ba$_2$NaOsO$_6$","The effects of doping on the electronic evolution of the Mott insulating
+state have been extensively studied in efforts to understand mechanisms of
+emergent quantum phases of materials. The study of these effects becomes ever
+more intriguing in the presence of entanglement between spin and orbital
+degrees of freedom. Here, we present a comprehensive investigation of charge
+doping in the double perovskite Ba$_2$NaOsO$_6$, a a complex Mott insulator
+where such entanglement plays an important role. We establish that the
+insulating magnetic ground state evolves from canted antiferromagnet (cAF)to
+N\'eel order for dopant levels exceeding ~ 10 %. Furthermore, we determine that
+a broken local point symmetry (BLPS) phase, precursor to the magnetically
+ordered state, occupies an extended portion of the (H-T) phase diagram with
+increased doping. This finding reveals that the breaking of the local cubic
+symmetry is driven by a multipolar order, most-likely of the
+antiferro-quadrupolar type.",2210.05077v2
+2023-02-28,$\mathbb{Z}_2$ Non-Hermitian skin effect in equilibrium heavy-fermions,"We demonstrate that a correlated equilibrium $f$-electron system with
+time-reversal symmetry can exhibit a $\mathbb{Z}_2$ non-Hermitian skin effect
+of quasi-particles. In particular, we analyze a two-dimensional periodic
+Anderson model with spin-orbit coupling by combining the dynamical mean-field
+theory (DMFT) and the numerical renormalization group. We prove the existence
+of the $\mathbb{Z}_2$ skin effect by explicitly calculating the topological
+invariant and show that spin-orbit interaction is essential to this effect. Our
+DMFT analysis demonstrates that the $\mathbb{Z}_2$ skin effect of
+quasi-particles is reflected on the pseudo-spectrum. Furthermore, we analyze
+temperature effects on this skin effect using the generalized Brillouin zone
+technique, which clarifies that the skin modes are strongly localized above the
+Kondo temperature.",2302.14366v3
+2023-03-28,Synchronization of spin-driven limit cycle oscillators optically levitated in vacuum,"We explore, experimentally and theoretically, the emergence of coherent
+coupled oscillations and synchronization between a pair of non-Hermitian,
+stochastic, opto-mechanical oscillators, levitated in vacuum. Each oscillator
+consists of a polystyrene microsphere trapped in a circularly polarized,
+counter-propagating Gaussian laser beam. Non-conservative, azimuthal forces,
+deriving from inhomogeneous optical spin, push the micro-particles out of
+thermodynamic equilibrium. For modest optical powers each particle shows a
+tendency towards orbital circulation. Initially, their stochastic motion is
+weakly correlated. As the power is increased, the tendency towards orbital
+circulation strengthens and the motion of the particles becomes highly
+correlated. Eventually, centripetal forces overcome optical gradient forces and
+the oscillators undergo a collective Hopf bifurcation. For laser powers
+exceeding this threshold, a pair of limit cycles appear, which synchronize due
+to weak optical and hydrodynamic interactions. In principle, arrays of such
+Non-Hermitian elements can be arranged, paving the way for opto-mechanical
+topological materials or, possibly, classical time crystals. In addition, the
+preparation of synchronized states in levitated optomechanics could lead to new
+and robust sensors or alternative routes to the entanglement of macroscopic
+objects.",2303.15753v1
+2023-07-11,Optical Memory for Arbitrary Perfect Poincaré States in an Atomic Ensemble,"Inherent spin angular momentum (SAM) and orbital angular momentum (OAM) which
+manifest as polarization and spatial degrees of freedom (DOF) of photons, hold
+a promise of large capability for applications in classical and quantum
+information processing. To enable these photonic spin and orbital dynamic
+properties strongly coupled with each other, Poincar\'{e} states have been
+proposed and offer advantages in data multiplexing, information encryption,
+precision metrology, and quantum memory. However, since the transverse size of
+Laguerre Gaussian beams strongly depends on their topological charge numbers
+$\left| l \right|$, it is difficult to store asymmetric Poincar\'{e} states due
+to the significantly different light-matter interaction for distinct spatial
+modes. Here, we experimentally realize the storage of perfect Poincar\'{e}
+states with arbitrary OAM quanta using the perfect optical vortex, in which 121
+arbitrarily-selected perfect Poincar\'{e} states have been stored with high
+fidelity. The reported work has great prospects in optical communication and
+quantum networks for dramatically increased encoding flexibility of
+information.",2307.05008v1
+2023-09-21,A new generation of effective core potentials: selected Lanthanides and heavy elements,"We construct correlation-consistent effective core potentials (ccECPs) for a
+selected set of heavy atoms and f-elements that are of significant current
+interest in materials and chemical applications, including Y, Zr, Nb, Rh, Ta,
+Re, Pt, Gd, and Tb. As customary, ccECPs consist of spin-orbit averaged
+relativistic effective potential (AREP) and effective spin-orbit (SO) terms.
+For the AREP part, our constructions are carried out within a relativistic
+coupled-cluster framework while also taking into objective function
+one-particle characteristics for improved convergence in optimizations. The
+transferability is adjusted using binding curves of hydride and oxide
+molecules. We address the difficulties encountered with f-elements, such as the
+presence of large cores and multiple near-degeneracies of excited levels. For
+these elements, we construct ccECPs with core-valence partitioning that
+includes 4f-subshell in the valence space. The developed ccECPs achieve an
+excellent balance between accuracy, size of the valence space, and
+transferability and are also suitable to be used in plane wave codes with
+reasonable energy cutoffs.",2309.12145v1
+2023-10-09,Micromagnetic textures in exchange coupled-ferromagnetic multiferroic films,"The development of new computing technologies has given a new stimulus in the
+study of multiferroics. The use of multiferroics allows the realization of
+competitive energy efficient scalable logic and storage devices. The low-power
+consumption in Magneto Electric-Spin Orbital logics and Magnetic Random Access
+Memory components is provided by magnetoelectric switching in multiferroic
+based systems using a low-energy electric field. Our work concerns the
+modelling of the Magneto Electric-Spin Orbital elements with an emphasis on the
+magnetoelectric component and simulation of magnetization reversal processes in
+a model system. The use of the proposed approach makes it possible to analyze
+the influence of dimensional factors (film thicknesses, transverse dimensions,
+sample shape) affecting the magnetic states of multiferroic nanoelements;
+taking into interfacial interactions (magnetic anisotropy and interlayer
+exchange); energy-efficient external influences that allow switching magnetic
+states using magnetic and electric fields.",2310.05438v1
+2023-10-26,Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene,"The quantum anomalous Hall effect (QAHE) is a robust topological phenomenon
+featuring quantized Hall resistance at zero magnetic field. We report the QAHE
+in a rhombohedral pentalayer graphene/monolayer WS2 heterostructure. Distinct
+from other experimentally confirmed QAHE systems, this system has neither
+magnetic element nor moir\'e superlattice effect. The QAH states emerge at
+charge neutrality and feature Chern numbers C = +-5 at temperatures up to about
+1.5 K. This large QAHE arises from the synergy of the electron correlation in
+intrinsic flat bands of pentalayer graphene, the gate-tuning effect, and the
+proximity-induced Ising spin-orbit-coupling. Our experiment demonstrates the
+potential of crystalline two-dimensional materials for intertwined electron
+correlation and band topology physics, and may enable a route for engineering
+chiral Majorana edge states.",2310.17483v2
+2024-02-07,A Non-Abelian Gauge Theory for Surface Excitations of $~^3$He-B,"In $~^3$He-B, two atoms pair in an orbital angular momentum $1$ spin triplet
+state above the phase transition temperature with $SO(3) \times SO(3)$
+symmetry. Below the transition temperature, this symmetry is spontaneously
+broken to the diagonal $SO(3)$ due to spin-orbit coupling. Considerations based
+on effective potentials and solitons show that $SO(3)$'s gets enhanced to
+$SU(3)$'s and the symmetry breaking is that of $G= SU(3) \times SU(3)\times
+U(1)$ to $H= SU(3)$. The theory of the resultant Goldtsone modes can be
+naturally formulated as a gauge theory of $H$. Its Gauss law is treated here
+and shown to lead to surface states in a container with a dynamics governed by
+large gauge transformations.
+  Observable consequences are pointed. The transference of the analysis to the
+chiral model of QCD is pointed out where $SU(3)$ are the left and right chiral
+groups, $U(1)$ is the axial $U(1)$ , the surviving symmetry is flavour $SU(3)$
+and the Goldstone modes are the pions.",2402.04714v2
+2024-03-25,Spin-orbit proximity in MoS$_2$/bilayer graphene heterostructures,"Van der Waals heterostructures provide a versatile platform for tailoring
+electronic properties through the integration of two-dimensional materials.
+Among these combinations, the interaction between bilayer graphene and
+transition metal dichalcogenides (TMDs) stands out due to its potential for
+inducing spin-orbit coupling (SOC) in graphene. Future devices concepts require
+the understanding the precise nature of SOC in TMD/bilayer graphene
+heterostructures and its influence on electronic transport phenomena. Here, we
+experimentally confirm the presence of two distinct types of SOC, Ising (1.55
+meV) and Rashba (2.5 meV), in bilayer graphene when interfaced with molybdenum
+disulphide, recognized as one of the most stable TMDs. Furthermore, we reveal a
+non-monotonic trend in conductivity with respect to the electric displacement
+field at charge neutrality. This phenomenon is ascribed to the existence of
+single-particle gaps induced by the Ising SOC, which can be closed by a
+critical displacement field. Remarkably, our findings also unveil sharp peaks
+in the magnetoconductivity around the critical displacement field, challenging
+existing theoretical models.",2403.17120v1
+2018-06-06,Impurity-induced orbital magnetization in a Rashba electron gas,"We investigate the induced orbital magnetization density in a Rashba electron
+gas with magnetic impurities. Relying on classical electrodynamics, we obtain
+this quantity through the bound currents composed of a paramagnetic and a
+diamagnetic-like contribution which emerge from the spin-orbit interaction.
+Similar to Friedel charge ripples, the bound currents and the orbital
+magnetization density oscillate as function of distance away from the impurity
+with characteristic wavelengths defined by the Fermi energy and the strength of
+the Rashba spin-orbit interaction. The net induced orbital magnetization was
+found to be of the order of magnitude of its spin counterpart. Besides the
+exploration of the impact of the electronic filling of the impurity states, we
+investigate and analyze the orbital magnetization induced by an equilateral
+frustrated trimer in various non-collinear magnetic states. On the one hand, we
+confirm that non-vanishing three-spin chiralities generate a finite orbital
+magnetization density. On the other hand, higher order contributions lead to
+multiple-spin chiralities affecting non-trivially and significantly the overall
+magnitude and sign of the orbital magnetization.",1806.02158v1
+2021-10-26,Ultrafast signatures of spin and orbital order in antiferromagnetic $α$-Sr$_2$CrO$_4$,"We used femtosecond optical spectroscopy to study ultrafast spin and orbital
+ordering dynamics in the antiferromagnetic Mott insulator
+$\alpha$-Sr$_2$CrO$_4$. This chromate system possesses multiple spin and
+orbital ordered phases, and therefore could enable us to study the unique
+interplay between these collective phases through their non-equilibrium
+response to photoexcitation. Here, by varying the pump photon energy, we
+selectively drove inter-site spin hopping between neighboring Cr $t_{2g}$
+orbitals and charge transfer-type transitions between oxygen 2$p$ and Cr
+$e_{g}$ orbitals. The resulting transient reflectivity dynamics revealed
+temperature-dependent anomalies across the N${\textrm{\'e}}$el temperature for
+spin ordering as well as the transition temperatures linked to different types
+of orbital order. Our results reveal distinct relaxation timescales for spin
+and orbital orders in $\alpha$-Sr$_2$CrO$_4$ and provide experimental evidence
+for the phase transition at $T_\textrm{O}$, possibly related to antiferro-type
+orbital ordering.",2110.14004v1
+2000-11-28,Paramagnetic-diamagnetic interplay in quantum dots for non-zero temperatures,"In the usual Fock-and Darwin-formalism with parabolic potential characterized
+by the confining energy $\eps_o := \hbar\omega_o= 3.37$ meV, but including
+explicitly also the Zeeman coupling between spin and magnetic field, we study
+the combined orbital and spin magnetic properties of quantum dots in a
+two-dimensional electron gas with parameters for GaAs, for N =1 and N >> 1
+electrons on the dot.
+  For N=1 the magnetization M(T,B) consists of a paramagnetic spin contribution
+and a diamagnetic orbital contribution, which dominate in a non-trivial way at
+low temperature and fields rsp. high temperature and fields.
+  For N >> 1, where orbital and spin effects are intrinsically coupled in a
+subtle way and cannot be separated, we find in a simplified Hartree
+approximation that at N=m^2, i.e. at a half-filled last shell, M(T,B,N) is
+parallel (antiparallel) to the magnetic field, if temperatures and fields are
+low enough (high enough), whereas for N\ne m^2 the magnetization oscillates
+with B and N as a T-dependent periodic function of the variable
+x:=\sqrt{N}eB/(2m^*c\omega_o), with T-independent period \Delta x =1 (where m^*
+:= 0.067 m_o is the small effective mass of GaAs, while m_o is the electron
+mass). Correspondingly, by an adiabatic demagnetization process, which should
+only be fast enough with respect to the slow transient time of the magnetic
+properties of the dot, the temperature of the dot diminishes rsp. increases
+with decreasing magnetic field, and in some cases we obtain quite pronounced
+effects.",0011465v3
+2019-07-26,Magnetoelectric control of topological phases in graphene,"Topological antiferromagnetic (AFM) spintronics is an emerging field of
+research, which involves the topological electronic states coupled to the AFM
+order parameter known as the N$\acute{\rm e}$el vector. The control of these
+states is envisioned through manipulation of the N$\acute{\rm e}$el vector by
+spin-orbit torques driven by electric currents. Here we propose a different
+approach favorable for low-power AFM spintronics, where the control of the
+topological states in a two-dimensional material, such as graphene, is
+performed via the proximity effect by the voltage induced switching of the
+N$\acute{\rm e}$el vector in an adjacent magnetoelectric AFM insulator, such as
+chromia. Mediated by the symmetry protected boundary magnetization and the
+induced Rashba-type spin-orbit coupling at the interface between graphene and
+chromia, the emergent topological phases in graphene can be controlled by the
+N$\acute{\rm e}$el vector. Using density functional theory and tight-binding
+Hamiltonian approaches, we model a graphene/Cr2O3 (0001) interface and
+demonstrate non-trivial band gap openings in the graphene Dirac bands
+asymmetric between the K and K' valleys. This gives rise to an unconventional
+quantum anomalous Hall effect (QAHE) with a quantized value of $2e^2/h$ and an
+additional step-like feature at a value close to $e^2/2h$, and the emergence of
+the spin-polarized valley Hall effect (VHE). Furthermore, depending on the
+N$\acute{\rm e}$el vector orientation, we predict the appearance and
+transformation of different topological phases in graphene across the
+$180^{\circ}$ AFM domain wall, involving the QAHE, the valley-polarized QAHE
+and the quantum VHE (QVHE), and the emergence of the chiral edge state along
+the domain wall. These topological properties are controlled by voltage through
+magnetoelectric switching of the AFM insulator with no need for spin-orbit
+torques.",1907.11689v1
+2019-03-05,Observation of Chiral Surface Excitons in a Topological Insulator Bi$_2$Se$_3$,"The protected electron states at the boundaries or on the surfaces of
+topological insulators (TIs) have been the subject of intense theoretical and
+experimental investigations. Such states are enforced by very strong spin-orbit
+interaction in solids composed of heavy elements. Here, we study the composite
+particles -- chiral excitons -- formed by the Coulomb attraction between
+electrons and holes residing on the surface of an archetypical
+three-dimensional topological insulator (TI), Bi$_2$Se$_3$. Photoluminescence
+(PL) emission arising due to recombination of excitons in conventional
+semiconductors is usually unpolarized because of scattering by phonons and
+other degrees of freedom during exciton thermalization. On the contrary, we
+observe almost perfectly polarization-preserving PL emission from chiral
+excitons. We demonstrate that the chiral excitons can be optically oriented
+with circularly polarized light in a broad range of excitation energies, even
+when the latter deviate from the (apparent) optical band gap by hundreds of
+meVs, and that the orientation remains preserved even at room temperature.
+Based on the dependences of the PL spectra on the energy and polarization of
+incident photons, we propose that chiral excitons are made from massive holes
+and massless (Dirac) electrons, both with chiral spin textures enforced by
+strong spin-orbit coupling. A theoretical model based on such proposal
+describes quantitatively the experimental observations. The optical orientation
+of composite particles, the chiral excitons, emerges as a general result of
+strong spin-orbit coupling in a 2D electron system. Our findings can
+potentially expand applications of TIs in photonics and optoelectronics.",1903.01999v1
+2001-01-06,A Realistic Description of Nucleon-Nucleon and Hyperon-Nucleon Interactions in the SU_6 Quark Model,"We upgrade a SU_6 quark-model description for the nucleon-nucleon and
+hyperon-nucleon interactions by improving the effective meson-exchange
+potentials acting between quarks. For the scalar- and vector-meson exchanges,
+the momentum-dependent higher-order term is incorporated to reduce the
+attractive effect of the central interaction at higher energies. The
+single-particle potentials of the nucleon and Lambda, predicted by the G-matrix
+calculation, now have proper repulsive behavior in the momentum region q_1=5 -
+20 fm^-1. A moderate contribution of the spin-orbit interaction from the
+scalar-meson exchange is also included. As to the vector mesons, a dominant
+contribution is the quadratic spin-orbit force generated from the rho-meson
+exchange. The nucleon-nucleon phase shifts at the non-relativistic energies up
+to T_lab=350 MeV are greatly improved especially for the 3E states. The
+low-energy observables of the nucleon-nucleon and the hyperon-nucleon
+interactions are also reexamined. The isospin symmetry breaking and the Coulomb
+effect are properly incorporated in the particle basis. The essential feature
+of the Lambda N - Sigma N coupling is qualitatively similar to that obtained
+from the previous models. The nuclear saturation properties and the
+single-particle potentials of the nucleon, Lambda and Sigma are reexamined
+through the G-matrix calculation. The single-particle potential of the Sigma
+hyperon is weakly repulsive in symmetric nuclear matter. The single-particle
+spin-orbit strength for the Lambda particle is very small, in comparison with
+that of the nucleons, due to the strong antisymmetric spin-orbit force
+generated from the Fermi-Breit interaction.",0101014v1
+2019-02-07,All-electron fully relativistic Kohn-Sham theory for solids based on the Dirac-Coulomb Hamiltonian and Gaussian-type functions,"We present the first full-potential method that solves the fully relativistic
+4-component Dirac-Kohn-Sham equation for materials in the solid state within
+the framework of atom-centered Gaussian-type orbitals (GTOs). Our GTO-based
+method treats one-, two-, and three-dimensional periodic systems on an equal
+footing, and allows for a seamless transition to the methodology commonly used
+in studies of molecules with heavy elements. The scalar relativistic effects
+and spin-orbit interaction are handled variationally. The full description of
+the electron-nuclear potential in the core region of heavy nuclei is
+straightforward due to the local nature of the GTOs and does not pose any
+computational difficulties. We show how the time-reversal symmetry and a
+quaternion algebra-based formalism can be exploited to significantly reduce the
+increased methodological complexity and computational cost associated with
+multiple wave-function components coupled by the spin-orbit interaction. We
+provide a description of how to employ the matrix form of the multipole
+expansion and an iterative renormalization procedure to evaluate the
+conditionally convergent lattice sums arising for periodic systems. We
+investigate the problem of inverse variational collapse that arises if the
+Dirac operator containing a repulsive periodic potential is expressed in a
+basis containing diffuse functions, and suggest a possible solution. We
+demonstrate the validity of the method on silver halide crystals with large
+relativistic effects, and two-dimensional honeycomb structures (silicene and
+germanene) exhibiting the spin-orbit-driven quantum spin Hall effect. Our
+results are well-converged with respect to the basis limit using standard bases
+developed for molecular calculations, and indicate that the rule of removing
+basis functions with small exponents should not be applied when transferring
+the molecular basis to solids.",1902.02828v2
+2018-10-03,"Landau quantization of nearly degenerate bands, and full symmetry classification of avoided Landau-level crossings","Semiclassical quantization rules compactly describe the energy dispersion of
+Landau levels, and are predictive of quantum oscillations in transport and
+thermodynamic quantities. Such rules -- as formulated by Onsager, Lifshitz and
+Roth -- apply when the spin-orbit interaction dominates over the Zeeman
+interaction (or vice versa), but does not generally apply when the two
+interactions are comparable in strength. In this work, we present a generalized
+quantization rule which treats the spin-orbit and Zeeman interactions on equal
+footing, and therefore has wider applicability to spin-orbit-coupled materials
+lacking a spatial inversion center, or having magnetic order. More generally,
+our rule describes the Landau quantization of any number of nearly degenerate
+energy bands -- in any symmetry class. The resultant Landau-level spectrum is
+generically non-equidistant but may contain spin (or pseudospin) degeneracies.
+To tune to such degeneracies in the absence of crystalline point-group
+symmetries, three real parameters are needed. We have exhaustively identified
+all symmetry classes of cyclotron orbits for which this number is reduced from
+three, thus establishing symmetry-enforced 'non-crossing rules' for Landau
+levels. In particular, only one parameter is needed in the presence of spatial
+rotation or inversion; this single parameter may be the magnitude or
+orientation of the field. Signatures of single-parameter tunability include (i)
+a smooth crossover between period-doubled and -undoubled quantum oscillations
+in the low-temperature Shubnikov-de Haas effect, as well as (ii) 'magic-angle'
+magnetoresistance oscillations. We demonstrate the utility of our quantization
+rule, as well as the tunability of Landau-level degeneracies, for the
+Rashba-Dresselhaus two-dimensional electron gas -- subject to an arbitrarily
+oriented magnetic field.",1810.01908v2
+2021-11-08,Theoretical study of the crystal and electronic properties of $α$-RuI$_3$,"The material $\alpha$-RuCl$_3$, with a two-dimensional Ru-honeycomb
+sublattice, has attracted considerable attention because it may be a
+realization of the Kitaev quantum spin liquid (QSL). Recently, a new honeycomb
+material, $\alpha$-RuI$_3$, was prepared under moderate high-pressure and it is
+stable under ambient conditions. However, different from $\alpha$-RuCl$_3$,
+$\alpha$-RuI$_3$ was reported to be a paramagnetic metal without long-range
+magnetic order down to $0.35$ K. Here, the structural and electronic properties
+of the quasi-two-dimensional $\alpha$-RuI$_3$ are theoretically studied. First,
+based on first-principles density functional theory (DFT) calculations, the ABC
+stacking honeycomb-layer $R\overline{3}$ (No. 148) structure is found to be the
+most likely stacking order for $\alpha$-RuI$_3$ along the $c$-axis.
+Furthermore, both $R\overline{3}$ and $P\overline{3}1c$ are dynamically stable
+because no imaginary frequency modes were obtained in the phononic dispersion
+spectrum. Moreover, the different physical behavior of $\alpha$-RuI$_3$
+compared to $\alpha$-RuCl$_3$ can be understood naturally. The strong
+hybridization between Ru $4d$ and I $5p$ orbitals decreases the effective
+atomic Hubbard repulsion $U$, leading the electrons of RuI$_3$ to be less
+localized than in RuCl$_3$. As a consequence, the effective repulsion $U$ is
+reduced from Cl to I, leading to the metallic nature of $\alpha$-RuI$_3$. Based
+on the DFT+$U$ ($U_{\rm eff} = 2$ eV), plus spin-orbital coupling (SOC), we
+obtained a spin-orbit Mott insulating behavior for $\alpha$-RuCl$_3$ and, by
+the same procedure, a metallic behavior for $\alpha$-RuI$_3$, in good agreement
+with experimental results. Furthermore, when introducing a large (unrealistic)
+$U_{\rm eff} = 6$ eV, the spin-orbit Mott gap opens in $\alpha$-RuI$_3$ as
+well, supporting the physical picture we are proposing.",2111.04560v2
+2022-02-25,Local multiplet formation around a single vacancy in graphene: an effective Anderson model analysis based on the block-Lanczos DMRG method,"To better understand the electronic structure of a single vacancy in
+graphene, we study the ground state property of an effective Anderson model,
+consisting of three dangling $sp^2$ orbitals of the surrounding carbon atoms
+around the vacancy and the $\pi$ orbitals of carbon atoms that form the
+honeycomb lattice with a single vacancy. Employing the block-Lanczos
+density-matrix renormalization group method, we show that there are two phases
+in the relevant parameter space, i.e., a nonmagnetic phase in the weak coupling
+region and a free magnetic moment phase in the realistic parameter region. The
+systematic analysis finds that, in the free magnetic moment phase, local
+multiplets of the doubly degenerate irreducible representation of the
+$\mathcal{C}_3$ point group with spin 1 become dominant in the ground state,
+and approximately half of this local spin 1 is screened by electrons in the
+surrounding $\pi$ orbitals, indicating the emergence of the residual spin-1/2
+free magnetic moment. Furthermore, we find that the emergence of the free
+magnetic moment is robust against carrier doping, which is in sharp contrast to
+the case of graphene with an adatom, thus explaining the qualitative difference
+observed experimentally in these two classes of systems. We also find the
+enhancement of the spin correlation function between $\pi$ electrons around the
+vacancy and those in the conduction band away from the vacancy in the undoped
+case, as compared to that in the doped case, while the spin correlation
+function between the $\sigma$ electrons in the $sp^2$ dangling orbitals around
+the vacancy and the $\pi$ electrons in the conduction band remains large in
+both undoped and doped cases. Our calculations thus support qualitatively the
+previous experiment that suggests the emergence of free magnetic moment with
+two distinct origins.",2202.12638v1
+2023-08-16,Biaxial strain modulated electronic structures of layered two-dimensional MoSiGeN4 Rashba systems,"The two-dimensional (2D) MA2Z4 family has received extensive attention in
+manipulating its electronic structure and achieving intriguing physical
+properties. However, engineering the electronic properties remains a challenge.
+Herein, based on first-principles calculations, we systematically investigate
+the effect of biaxial strains on the electronic structures of 2D Rashba
+MoSiGeN4 (MSGN), and further explore how the interlayer interactions affect the
+Rashba spin splitting in such strained layered MSGNs. After applying biaxial
+strains, the band gap decreases monotonically with increasing tensile strains
+but increases when the compressive strains are applied. An
+indirect-direct-indirect band gap transition is induced by applying a moderate
+compressive strain (< 5%) in the MSGNs. Due to the symmetry breaking and
+moderate spin-orbit coupling (SOC), the monolayer MSGN possess an isolated
+Rashba spin splitting (R) near the Fermi level, which could be effectively
+regulated to the Lifshitz transition (L) by biaxial strain. For instance, a
+L-R-L transformation of Fermi surface is presented in monolayer and a more
+complex and changeable L-R-L-R evolution is observed in bilayer and trilayer
+MSGNs as the biaxial strain vary from -8% to 12%, which actually depend on the
+appearance, variation, and vanish of the Mexican hat band in the absence of SOC
+under different strains. The contribution of Mo-dz2 orbital hybridized with
+N-pz orbital in the highest valence band plays a dominant role on the band
+evolution under biaxial strains, where the R-L evolution corresponds to the
+decreased Mo-dz2 orbital contribution. Our study highlights the biaxial strain
+controllable Rashba spin splitting, in particular the introduction and even the
+evolution of Lifshitz transition near Fermi surface, which makes the strained
+MSGNs as promising candidates for future applications in spintronic devices.",2308.08211v1